Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6

[linux-2.6] / drivers / scsi / lpfc / lpfc_els.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2008 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/
/* See Fibre Channel protocol T11 FC-LS for details */
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/interrupt.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_fc.h>

#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_logmsg.h"
#include "lpfc_crtn.h"
#include "lpfc_vport.h"
#include "lpfc_debugfs.h"

static int lpfc_els_retry(struct lpfc_hba *, struct lpfc_iocbq *,
                          struct lpfc_iocbq *);
static void lpfc_cmpl_fabric_iocb(struct lpfc_hba *, struct lpfc_iocbq *,
                        struct lpfc_iocbq *);
static void lpfc_fabric_abort_vport(struct lpfc_vport *vport);
static int lpfc_issue_els_fdisc(struct lpfc_vport *vport,
                                struct lpfc_nodelist *ndlp, uint8_t retry);
static int lpfc_issue_fabric_iocb(struct lpfc_hba *phba,
                                  struct lpfc_iocbq *iocb);
static void lpfc_register_new_vport(struct lpfc_hba *phba,
                                    struct lpfc_vport *vport,
                                    struct lpfc_nodelist *ndlp);

static int lpfc_max_els_tries = 3;

/**
 * lpfc_els_chk_latt: Check host link attention event for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine checks whether there is an outstanding host link
 * attention event during the discovery process with the @vport. It is done
 * by reading the HBA's Host Attention (HA) register. If there is any host
 * link attention events during this @vport's discovery process, the @vport
 * shall be marked as FC_ABORT_DISCOVERY, a host link attention clear shall
 * be issued if the link state is not already in host link cleared state,
 * and a return code shall indicate whether the host link attention event
 * had happened.
 *
 * Note that, if either the host link is in state LPFC_LINK_DOWN or @vport
 * state in LPFC_VPORT_READY, the request for checking host link attention
 * event will be ignored and a return code shall indicate no host link
 * attention event had happened.
 *
 * Return codes
 *   0 - no host link attention event happened
 *   1 - host link attention event happened
 **/
int
lpfc_els_chk_latt(struct lpfc_vport *vport)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        uint32_t ha_copy;

        if (vport->port_state >= LPFC_VPORT_READY ||
            phba->link_state == LPFC_LINK_DOWN)
                return 0;

        /* Read the HBA Host Attention Register */
        ha_copy = readl(phba->HAregaddr);

        if (!(ha_copy & HA_LATT))
                return 0;

        /* Pending Link Event during Discovery */
        lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
                         "0237 Pending Link Event during "
                         "Discovery: State x%x\n",
                         phba->pport->port_state);

        /* CLEAR_LA should re-enable link attention events and
         * we should then imediately take a LATT event. The
         * LATT processing should call lpfc_linkdown() which
         * will cleanup any left over in-progress discovery
         * events.
         */
        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_ABORT_DISCOVERY;
        spin_unlock_irq(shost->host_lock);

        if (phba->link_state != LPFC_CLEAR_LA)
                lpfc_issue_clear_la(phba, vport);

        return 1;
}

/**
 * lpfc_prep_els_iocb: Allocate and prepare a lpfc iocb data structure.
 * @vport: pointer to a host virtual N_Port data structure.
 * @expectRsp: flag indicating whether response is expected.
 * @cmdSize: size of the ELS command.
 * @retry: number of retries to the command IOCB when it fails.
 * @ndlp: pointer to a node-list data structure.
 * @did: destination identifier.
 * @elscmd: the ELS command code.
 *
 * This routine is used for allocating a lpfc-IOCB data structure from
 * the driver lpfc-IOCB free-list and prepare the IOCB with the parameters
 * passed into the routine for discovery state machine to issue an Extended
 * Link Service (ELS) commands. It is a generic lpfc-IOCB allocation
 * and preparation routine that is used by all the discovery state machine
 * routines and the ELS command-specific fields will be later set up by
 * the individual discovery machine routines after calling this routine
 * allocating and preparing a generic IOCB data structure. It fills in the
 * Buffer Descriptor Entries (BDEs), allocates buffers for both command
 * payload and response payload (if expected). The reference count on the
 * ndlp is incremented by 1 and the reference to the ndlp is put into
 * context1 of the IOCB data structure for this IOCB to hold the ndlp
 * reference for the command's callback function to access later.
 *
 * Return code
 *   Pointer to the newly allocated/prepared els iocb data structure
 *   NULL - when els iocb data structure allocation/preparation failed
 **/
static struct lpfc_iocbq *
lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp,
                   uint16_t cmdSize, uint8_t retry,
                   struct lpfc_nodelist *ndlp, uint32_t did,
                   uint32_t elscmd)
{
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_dmabuf *pcmd, *prsp, *pbuflist;
        struct ulp_bde64 *bpl;
        IOCB_t *icmd;


        if (!lpfc_is_link_up(phba))
                return NULL;

        /* Allocate buffer for  command iocb */
        elsiocb = lpfc_sli_get_iocbq(phba);

        if (elsiocb == NULL)
                return NULL;

        icmd = &elsiocb->iocb;

        /* fill in BDEs for command */
        /* Allocate buffer for command payload */
        pcmd = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (pcmd)
                pcmd->virt = lpfc_mbuf_alloc(phba, MEM_PRI, &pcmd->phys);
        if (!pcmd || !pcmd->virt)
                goto els_iocb_free_pcmb_exit;

        INIT_LIST_HEAD(&pcmd->list);

        /* Allocate buffer for response payload */
        if (expectRsp) {
                prsp = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
                if (prsp)
                        prsp->virt = lpfc_mbuf_alloc(phba, MEM_PRI,
                                                     &prsp->phys);
                if (!prsp || !prsp->virt)
                        goto els_iocb_free_prsp_exit;
                INIT_LIST_HEAD(&prsp->list);
        } else
                prsp = NULL;

        /* Allocate buffer for Buffer ptr list */
        pbuflist = kmalloc(sizeof(struct lpfc_dmabuf), GFP_KERNEL);
        if (pbuflist)
                pbuflist->virt = lpfc_mbuf_alloc(phba, MEM_PRI,
                                                 &pbuflist->phys);
        if (!pbuflist || !pbuflist->virt)
                goto els_iocb_free_pbuf_exit;

        INIT_LIST_HEAD(&pbuflist->list);

        icmd->un.elsreq64.bdl.addrHigh = putPaddrHigh(pbuflist->phys);
        icmd->un.elsreq64.bdl.addrLow = putPaddrLow(pbuflist->phys);
        icmd->un.elsreq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
        icmd->un.elsreq64.remoteID = did;       /* DID */
        if (expectRsp) {
                icmd->un.elsreq64.bdl.bdeSize = (2 * sizeof(struct ulp_bde64));
                icmd->ulpCommand = CMD_ELS_REQUEST64_CR;
                icmd->ulpTimeout = phba->fc_ratov * 2;
        } else {
                icmd->un.elsreq64.bdl.bdeSize = sizeof(struct ulp_bde64);
                icmd->ulpCommand = CMD_XMIT_ELS_RSP64_CX;
        }
        icmd->ulpBdeCount = 1;
        icmd->ulpLe = 1;
        icmd->ulpClass = CLASS3;

        if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
                icmd->un.elsreq64.myID = vport->fc_myDID;

                /* For ELS_REQUEST64_CR, use the VPI by default */
                icmd->ulpContext = vport->vpi;
                icmd->ulpCt_h = 0;
                icmd->ulpCt_l = 1;
        }

        bpl = (struct ulp_bde64 *) pbuflist->virt;
        bpl->addrLow = le32_to_cpu(putPaddrLow(pcmd->phys));
        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pcmd->phys));
        bpl->tus.f.bdeSize = cmdSize;
        bpl->tus.f.bdeFlags = 0;
        bpl->tus.w = le32_to_cpu(bpl->tus.w);

        if (expectRsp) {
                bpl++;
                bpl->addrLow = le32_to_cpu(putPaddrLow(prsp->phys));
                bpl->addrHigh = le32_to_cpu(putPaddrHigh(prsp->phys));
                bpl->tus.f.bdeSize = FCELSSIZE;
                bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
                bpl->tus.w = le32_to_cpu(bpl->tus.w);
        }

        /* prevent preparing iocb with NULL ndlp reference */
        elsiocb->context1 = lpfc_nlp_get(ndlp);
        if (!elsiocb->context1)
                goto els_iocb_free_pbuf_exit;
        elsiocb->context2 = pcmd;
        elsiocb->context3 = pbuflist;
        elsiocb->retry = retry;
        elsiocb->vport = vport;
        elsiocb->drvrTimeout = (phba->fc_ratov << 1) + LPFC_DRVR_TIMEOUT;

        if (prsp) {
                list_add(&prsp->list, &pcmd->list);
        }
        if (expectRsp) {
                /* Xmit ELS command <elsCmd> to remote NPORT <did> */
                lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                                 "0116 Xmit ELS command x%x to remote "
                                 "NPORT x%x I/O tag: x%x, port state: x%x\n",
                                 elscmd, did, elsiocb->iotag,
                                 vport->port_state);
        } else {
                /* Xmit ELS response <elsCmd> to remote NPORT <did> */
                lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                                 "0117 Xmit ELS response x%x to remote "
                                 "NPORT x%x I/O tag: x%x, size: x%x\n",
                                 elscmd, ndlp->nlp_DID, elsiocb->iotag,
                                 cmdSize);
        }
        return elsiocb;

els_iocb_free_pbuf_exit:
        lpfc_mbuf_free(phba, prsp->virt, prsp->phys);
        kfree(pbuflist);

els_iocb_free_prsp_exit:
        lpfc_mbuf_free(phba, pcmd->virt, pcmd->phys);
        kfree(prsp);

els_iocb_free_pcmb_exit:
        kfree(pcmd);
        lpfc_sli_release_iocbq(phba, elsiocb);
        return NULL;
}

/**
 * lpfc_issue_fabric_reglogin: Issue fabric registration login for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues a fabric registration login for a @vport. An
 * active ndlp node with Fabric_DID must already exist for this @vport.
 * The routine invokes two mailbox commands to carry out fabric registration
 * login through the HBA firmware: the first mailbox command requests the
 * HBA to perform link configuration for the @vport; and the second mailbox
 * command requests the HBA to perform the actual fabric registration login
 * with the @vport.
 *
 * Return code
 *   0 - successfully issued fabric registration login for @vport
 *   -ENXIO -- failed to issue fabric registration login for @vport
 **/
static int
lpfc_issue_fabric_reglogin(struct lpfc_vport *vport)
{
        struct lpfc_hba  *phba = vport->phba;
        LPFC_MBOXQ_t *mbox;
        struct lpfc_dmabuf *mp;
        struct lpfc_nodelist *ndlp;
        struct serv_parm *sp;
        int rc;
        int err = 0;

        sp = &phba->fc_fabparam;
        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                err = 1;
                goto fail;
        }

        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mbox) {
                err = 2;
                goto fail;
        }

        vport->port_state = LPFC_FABRIC_CFG_LINK;
        lpfc_config_link(phba, mbox);
        mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
        mbox->vport = vport;

        rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
        if (rc == MBX_NOT_FINISHED) {
                err = 3;
                goto fail_free_mbox;
        }

        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!mbox) {
                err = 4;
                goto fail;
        }
        rc = lpfc_reg_login(phba, vport->vpi, Fabric_DID, (uint8_t *)sp, mbox,
                            0);
        if (rc) {
                err = 5;
                goto fail_free_mbox;
        }

        mbox->mbox_cmpl = lpfc_mbx_cmpl_fabric_reg_login;
        mbox->vport = vport;
        /* increment the reference count on ndlp to hold reference
         * for the callback routine.
         */
        mbox->context2 = lpfc_nlp_get(ndlp);

        rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
        if (rc == MBX_NOT_FINISHED) {
                err = 6;
                goto fail_issue_reg_login;
        }

        return 0;

fail_issue_reg_login:
        /* decrement the reference count on ndlp just incremented
         * for the failed mbox command.
         */
        lpfc_nlp_put(ndlp);
        mp = (struct lpfc_dmabuf *) mbox->context1;
        lpfc_mbuf_free(phba, mp->virt, mp->phys);
        kfree(mp);
fail_free_mbox:
        mempool_free(mbox, phba->mbox_mem_pool);

fail:
        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                "0249 Cannot issue Register Fabric login: Err %d\n", err);
        return -ENXIO;
}

/**
 * lpfc_cmpl_els_flogi_fabric: Completion function for flogi to a fabric port.
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @sp: pointer to service parameter data structure.
 * @irsp: pointer to the IOCB within the lpfc response IOCB.
 *
 * This routine is invoked by the lpfc_cmpl_els_flogi() completion callback
 * function to handle the completion of a Fabric Login (FLOGI) into a fabric
 * port in a fabric topology. It properly sets up the parameters to the @ndlp
 * from the IOCB response. It also check the newly assigned N_Port ID to the
 * @vport against the previously assigned N_Port ID. If it is different from
 * the previously assigned Destination ID (DID), the lpfc_unreg_rpi() routine
 * is invoked on all the remaining nodes with the @vport to unregister the
 * Remote Port Indicators (RPIs). Finally, the lpfc_issue_fabric_reglogin()
 * is invoked to register login to the fabric.
 *
 * Return code
 *   0 - Success (currently, always return 0)
 **/
static int
lpfc_cmpl_els_flogi_fabric(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           struct serv_parm *sp, IOCB_t *irsp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_nodelist *np;
        struct lpfc_nodelist *next_np;

        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_FABRIC;
        spin_unlock_irq(shost->host_lock);

        phba->fc_edtov = be32_to_cpu(sp->cmn.e_d_tov);
        if (sp->cmn.edtovResolution)    /* E_D_TOV ticks are in nanoseconds */
                phba->fc_edtov = (phba->fc_edtov + 999999) / 1000000;

        phba->fc_ratov = (be32_to_cpu(sp->cmn.w2.r_a_tov) + 999) / 1000;

        if (phba->fc_topology == TOPOLOGY_LOOP) {
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_PUBLIC_LOOP;
                spin_unlock_irq(shost->host_lock);
        } else {
                /*
                 * If we are a N-port connected to a Fabric, fixup sparam's so
                 * logins to devices on remote loops work.
                 */
                vport->fc_sparam.cmn.altBbCredit = 1;
        }

        vport->fc_myDID = irsp->un.ulpWord[4] & Mask_DID;
        memcpy(&ndlp->nlp_portname, &sp->portName, sizeof(struct lpfc_name));
        memcpy(&ndlp->nlp_nodename, &sp->nodeName, sizeof(struct lpfc_name));
        ndlp->nlp_class_sup = 0;
        if (sp->cls1.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS1;
        if (sp->cls2.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS2;
        if (sp->cls3.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS3;
        if (sp->cls4.classValid)
                ndlp->nlp_class_sup |= FC_COS_CLASS4;
        ndlp->nlp_maxframe = ((sp->cmn.bbRcvSizeMsb & 0x0F) << 8) |
                                sp->cmn.bbRcvSizeLsb;
        memcpy(&phba->fc_fabparam, sp, sizeof(struct serv_parm));

        if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
                if (sp->cmn.response_multiple_NPort) {
                        lpfc_printf_vlog(vport, KERN_WARNING,
                                         LOG_ELS | LOG_VPORT,
                                         "1816 FLOGI NPIV supported, "
                                         "response data 0x%x\n",
                                         sp->cmn.response_multiple_NPort);
                        phba->link_flag |= LS_NPIV_FAB_SUPPORTED;
                } else {
                        /* Because we asked f/w for NPIV it still expects us
                        to call reg_vnpid atleast for the physcial host */
                        lpfc_printf_vlog(vport, KERN_WARNING,
                                         LOG_ELS | LOG_VPORT,
                                         "1817 Fabric does not support NPIV "
                                         "- configuring single port mode.\n");
                        phba->link_flag &= ~LS_NPIV_FAB_SUPPORTED;
                }
        }

        if ((vport->fc_prevDID != vport->fc_myDID) &&
                !(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) {

                /* If our NportID changed, we need to ensure all
                 * remaining NPORTs get unreg_login'ed.
                 */
                list_for_each_entry_safe(np, next_np,
                                        &vport->fc_nodes, nlp_listp) {
                        if (!NLP_CHK_NODE_ACT(np))
                                continue;
                        if ((np->nlp_state != NLP_STE_NPR_NODE) ||
                                   !(np->nlp_flag & NLP_NPR_ADISC))
                                continue;
                        spin_lock_irq(shost->host_lock);
                        np->nlp_flag &= ~NLP_NPR_ADISC;
                        spin_unlock_irq(shost->host_lock);
                        lpfc_unreg_rpi(vport, np);
                }
                if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
                        lpfc_mbx_unreg_vpi(vport);
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
                        spin_unlock_irq(shost->host_lock);
                }
        }

        lpfc_nlp_set_state(vport, ndlp, NLP_STE_REG_LOGIN_ISSUE);

        if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED &&
            vport->fc_flag & FC_VPORT_NEEDS_REG_VPI) {
                lpfc_register_new_vport(phba, vport, ndlp);
                return 0;
        }
        lpfc_issue_fabric_reglogin(vport);
        return 0;
}

/**
 * lpfc_cmpl_els_flogi_nport: Completion function for flogi to an N_Port.
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @sp: pointer to service parameter data structure.
 *
 * This routine is invoked by the lpfc_cmpl_els_flogi() completion callback
 * function to handle the completion of a Fabric Login (FLOGI) into an N_Port
 * in a point-to-point topology. First, the @vport's N_Port Name is compared
 * with the received N_Port Name: if the @vport's N_Port Name is greater than
 * the received N_Port Name lexicographically, this node shall assign local
 * N_Port ID (PT2PT_LocalID: 1) and remote N_Port ID (PT2PT_RemoteID: 2) and
 * will send out Port Login (PLOGI) with the N_Port IDs assigned. Otherwise,
 * this node shall just wait for the remote node to issue PLOGI and assign
 * N_Port IDs.
 *
 * Return code
 *   0 - Success
 *   -ENXIO - Fail
 **/
static int
lpfc_cmpl_els_flogi_nport(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                          struct serv_parm *sp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        LPFC_MBOXQ_t *mbox;
        int rc;

        spin_lock_irq(shost->host_lock);
        vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
        spin_unlock_irq(shost->host_lock);

        phba->fc_edtov = FF_DEF_EDTOV;
        phba->fc_ratov = FF_DEF_RATOV;
        rc = memcmp(&vport->fc_portname, &sp->portName,
                    sizeof(vport->fc_portname));
        if (rc >= 0) {
                /* This side will initiate the PLOGI */
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_PT2PT_PLOGI;
                spin_unlock_irq(shost->host_lock);

                /*
                 * N_Port ID cannot be 0, set our to LocalID the other
                 * side will be RemoteID.
                 */

                /* not equal */
                if (rc)
                        vport->fc_myDID = PT2PT_LocalID;

                mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
                if (!mbox)
                        goto fail;

                lpfc_config_link(phba, mbox);

                mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                mbox->vport = vport;
                rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
                if (rc == MBX_NOT_FINISHED) {
                        mempool_free(mbox, phba->mbox_mem_pool);
                        goto fail;
                }
                /* Decrement ndlp reference count indicating that ndlp can be
                 * safely released when other references to it are done.
                 */
                lpfc_nlp_put(ndlp);

                ndlp = lpfc_findnode_did(vport, PT2PT_RemoteID);
                if (!ndlp) {
                        /*
                         * Cannot find existing Fabric ndlp, so allocate a
                         * new one
                         */
                        ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                        if (!ndlp)
                                goto fail;
                        lpfc_nlp_init(vport, ndlp, PT2PT_RemoteID);
                } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                        ndlp = lpfc_enable_node(vport, ndlp,
                                                NLP_STE_UNUSED_NODE);
                        if(!ndlp)
                                goto fail;
                }

                memcpy(&ndlp->nlp_portname, &sp->portName,
                       sizeof(struct lpfc_name));
                memcpy(&ndlp->nlp_nodename, &sp->nodeName,
                       sizeof(struct lpfc_name));
                /* Set state will put ndlp onto node list if not already done */
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
        } else
                /* This side will wait for the PLOGI, decrement ndlp reference
                 * count indicating that ndlp can be released when other
                 * references to it are done.
                 */
                lpfc_nlp_put(ndlp);

        /* If we are pt2pt with another NPort, force NPIV off! */
        phba->sli3_options &= ~LPFC_SLI3_NPIV_ENABLED;

        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_PT2PT;
        spin_unlock_irq(shost->host_lock);

        /* Start discovery - this should just do CLEAR_LA */
        lpfc_disc_start(vport);
        return 0;
fail:
        return -ENXIO;
}

/**
 * lpfc_cmpl_els_flogi: Completion callback function for flogi.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the top-level completion callback function for issuing
 * a Fabric Login (FLOGI) command. If the response IOCB reported error,
 * the lpfc_els_retry() routine shall be invoked to retry the FLOGI. If
 * retry has been made (either immediately or delayed with lpfc_els_retry()
 * returning 1), the command IOCB will be released and function returned.
 * If the retry attempt has been given up (possibly reach the maximum
 * number of retries), one additional decrement of ndlp reference shall be
 * invoked before going out after releasing the command IOCB. This will
 * actually release the remote node (Note, lpfc_els_free_iocb() will also
 * invoke one decrement of ndlp reference count). If no error reported in
 * the IOCB status, the command Port ID field is used to determine whether
 * this is a point-to-point topology or a fabric topology: if the Port ID
 * field is assigned, it is a fabric topology; otherwise, it is a
 * point-to-point topology. The routine lpfc_cmpl_els_flogi_fabric() or
 * lpfc_cmpl_els_flogi_nport() shall be invoked accordingly to handle the
 * specific topology completion conditions.
 **/
static void
lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp = &rspiocb->iocb;
        struct lpfc_nodelist *ndlp = cmdiocb->context1;
        struct lpfc_dmabuf *pcmd = cmdiocb->context2, *prsp;
        struct serv_parm *sp;
        int rc;

        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport)) {
                /* One additional decrement on node reference count to
                 * trigger the release of the node
                 */
                lpfc_nlp_put(ndlp);
                goto out;
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "FLOGI cmpl:      status:x%x/x%x state:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                vport->port_state);

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb))
                        goto out;

                /* FLOGI failed, so there is no fabric */
                spin_lock_irq(shost->host_lock);
                vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
                spin_unlock_irq(shost->host_lock);

                /* If private loop, then allow max outstanding els to be
                 * LPFC_MAX_DISC_THREADS (32). Scanning in the case of no
                 * alpa map would take too long otherwise.
                 */
                if (phba->alpa_map[0] == 0) {
                        vport->cfg_discovery_threads = LPFC_MAX_DISC_THREADS;
                }

                /* FLOGI failure */
                lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                                 "0100 FLOGI failure Data: x%x x%x "
                                 "x%x\n",
                                 irsp->ulpStatus, irsp->un.ulpWord[4],
                                 irsp->ulpTimeout);
                goto flogifail;
        }

        /*
         * The FLogI succeeded.  Sync the data for the CPU before
         * accessing it.
         */
        prsp = list_get_first(&pcmd->list, struct lpfc_dmabuf, list);

        sp = prsp->virt + sizeof(uint32_t);

        /* FLOGI completes successfully */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0101 FLOGI completes sucessfully "
                         "Data: x%x x%x x%x x%x\n",
                         irsp->un.ulpWord[4], sp->cmn.e_d_tov,
                         sp->cmn.w2.r_a_tov, sp->cmn.edtovResolution);

        if (vport->port_state == LPFC_FLOGI) {
                /*
                 * If Common Service Parameters indicate Nport
                 * we are point to point, if Fport we are Fabric.
                 */
                if (sp->cmn.fPort)
                        rc = lpfc_cmpl_els_flogi_fabric(vport, ndlp, sp, irsp);
                else
                        rc = lpfc_cmpl_els_flogi_nport(vport, ndlp, sp);

                if (!rc)
                        goto out;
        }

flogifail:
        lpfc_nlp_put(ndlp);

        if (!lpfc_error_lost_link(irsp)) {
                /* FLOGI failed, so just use loop map to make discovery list */
                lpfc_disc_list_loopmap(vport);

                /* Start discovery */
                lpfc_disc_start(vport);
        } else if (((irsp->ulpStatus != IOSTAT_LOCAL_REJECT) ||
                        ((irsp->un.ulpWord[4] != IOERR_SLI_ABORTED) &&
                        (irsp->un.ulpWord[4] != IOERR_SLI_DOWN))) &&
                        (phba->link_state != LPFC_CLEAR_LA)) {
                /* If FLOGI failed enable link interrupt. */
                lpfc_issue_clear_la(phba, vport);
        }
out:
        lpfc_els_free_iocb(phba, cmdiocb);
}

/**
 * lpfc_issue_els_flogi: Issue an flogi iocb command for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Fabric Login (FLOGI) Request ELS command
 * for a @vport. The initiator service parameters are put into the payload
 * of the FLOGI Request IOCB and the top-level callback function pointer
 * to lpfc_cmpl_els_flogi() routine is put to the IOCB completion callback
 * function field. The lpfc_issue_fabric_iocb routine is invoked to send
 * out FLOGI ELS command with one outstanding fabric IOCB at a time.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the FLOGI ELS command.
 *
 * Return code
 *   0 - successfully issued flogi iocb for @vport
 *   1 - failed to issue flogi iocb for @vport
 **/
static int
lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        struct serv_parm *sp;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        uint8_t *pcmd;
        uint16_t cmdsize;
        uint32_t tmo;
        int rc;

        pring = &phba->sli.ring[LPFC_ELS_RING];

        cmdsize = (sizeof(uint32_t) + sizeof(struct serv_parm));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_FLOGI);

        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For FLOGI request, remainder of payload is service parameters */
        *((uint32_t *) (pcmd)) = ELS_CMD_FLOGI;
        pcmd += sizeof(uint32_t);
        memcpy(pcmd, &vport->fc_sparam, sizeof(struct serv_parm));
        sp = (struct serv_parm *) pcmd;

        /* Setup CSPs accordingly for Fabric */
        sp->cmn.e_d_tov = 0;
        sp->cmn.w2.r_a_tov = 0;
        sp->cls1.classValid = 0;
        sp->cls2.seqDelivery = 1;
        sp->cls3.seqDelivery = 1;
        if (sp->cmn.fcphLow < FC_PH3)
                sp->cmn.fcphLow = FC_PH3;
        if (sp->cmn.fcphHigh < FC_PH3)
                sp->cmn.fcphHigh = FC_PH3;

        if (phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) {
                sp->cmn.request_multiple_Nport = 1;

                /* For FLOGI, Let FLOGI rsp set the NPortID for VPI 0 */
                icmd->ulpCt_h = 1;
                icmd->ulpCt_l = 0;
        }

        if (phba->fc_topology != TOPOLOGY_LOOP) {
                icmd->un.elsreq64.myID = 0;
                icmd->un.elsreq64.fl = 1;
        }

        tmo = phba->fc_ratov;
        phba->fc_ratov = LPFC_DISC_FLOGI_TMO;
        lpfc_set_disctmo(vport);
        phba->fc_ratov = tmo;

        phba->fc_stat.elsXmitFLOGI++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_flogi;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue FLOGI:     opt:x%x",
                phba->sli3_options, 0, 0);

        rc = lpfc_issue_fabric_iocb(phba, elsiocb);
        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_abort_flogi: Abort all outstanding flogi iocbs.
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine aborts all the outstanding Fabric Login (FLOGI) IOCBs
 * with a @phba. This routine walks all the outstanding IOCBs on the txcmplq
 * list and issues an abort IOCB commond on each outstanding IOCB that
 * contains a active Fabric_DID ndlp. Note that this function is to issue
 * the abort IOCB command on all the outstanding IOCBs, thus when this
 * function returns, it does not guarantee all the IOCBs are actually aborted.
 *
 * Return code
 *   0 - Sucessfully issued abort iocb on all outstanding flogis (Always 0)
 **/
int
lpfc_els_abort_flogi(struct lpfc_hba *phba)
{
        struct lpfc_sli_ring *pring;
        struct lpfc_iocbq *iocb, *next_iocb;
        struct lpfc_nodelist *ndlp;
        IOCB_t *icmd;

        /* Abort outstanding I/O on NPort <nlp_DID> */
        lpfc_printf_log(phba, KERN_INFO, LOG_DISCOVERY,
                        "0201 Abort outstanding I/O on NPort x%x\n",
                        Fabric_DID);

        pring = &phba->sli.ring[LPFC_ELS_RING];

        /*
         * Check the txcmplq for an iocb that matches the nport the driver is
         * searching for.
         */
        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(iocb, next_iocb, &pring->txcmplq, list) {
                icmd = &iocb->iocb;
                if (icmd->ulpCommand == CMD_ELS_REQUEST64_CR &&
                    icmd->un.elsreq64.bdl.ulpIoTag32) {
                        ndlp = (struct lpfc_nodelist *)(iocb->context1);
                        if (ndlp && NLP_CHK_NODE_ACT(ndlp) &&
                            (ndlp->nlp_DID == Fabric_DID))
                                lpfc_sli_issue_abort_iotag(phba, pring, iocb);
                }
        }
        spin_unlock_irq(&phba->hbalock);

        return 0;
}

/**
 * lpfc_initial_flogi: Issue an initial fabric login for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues an initial Fabric Login (FLOGI) for the @vport
 * specified. It first searches the ndlp with the Fabric_DID (0xfffffe) from
 * the @vport's ndlp list. If no such ndlp found, it will create an ndlp and
 * put it into the @vport's ndlp list. If an inactive ndlp found on the list,
 * it will just be enabled and made active. The lpfc_issue_els_flogi() routine
 * is then invoked with the @vport and the ndlp to perform the FLOGI for the
 * @vport.
 *
 * Return code
 *   0 - failed to issue initial flogi for @vport
 *   1 - successfully issued initial flogi for @vport
 **/
int
lpfc_initial_flogi(struct lpfc_vport *vport)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_nodelist *ndlp;

        vport->port_state = LPFC_FLOGI;
        lpfc_set_disctmo(vport);

        /* First look for the Fabric ndlp */
        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (!ndlp) {
                /* Cannot find existing Fabric ndlp, so allocate a new one */
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 0;
                lpfc_nlp_init(vport, ndlp, Fabric_DID);
                /* Put ndlp onto node list */
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                /* re-setup ndlp without removing from node list */
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 0;
        }

        if (lpfc_issue_els_flogi(vport, ndlp, 0))
                /* This decrement of reference count to node shall kick off
                 * the release of the node.
                 */
                lpfc_nlp_put(ndlp);

        return 1;
}

/**
 * lpfc_initial_fdisc: Issue an initial fabric discovery for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues an initial Fabric Discover (FDISC) for the @vport
 * specified. It first searches the ndlp with the Fabric_DID (0xfffffe) from
 * the @vport's ndlp list. If no such ndlp found, it will create an ndlp and
 * put it into the @vport's ndlp list. If an inactive ndlp found on the list,
 * it will just be enabled and made active. The lpfc_issue_els_fdisc() routine
 * is then invoked with the @vport and the ndlp to perform the FDISC for the
 * @vport.
 *
 * Return code
 *   0 - failed to issue initial fdisc for @vport
 *   1 - successfully issued initial fdisc for @vport
 **/
int
lpfc_initial_fdisc(struct lpfc_vport *vport)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_nodelist *ndlp;

        /* First look for the Fabric ndlp */
        ndlp = lpfc_findnode_did(vport, Fabric_DID);
        if (!ndlp) {
                /* Cannot find existing Fabric ndlp, so allocate a new one */
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 0;
                lpfc_nlp_init(vport, ndlp, Fabric_DID);
                /* Put ndlp onto node list */
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                /* re-setup ndlp without removing from node list */
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 0;
        }

        if (lpfc_issue_els_fdisc(vport, ndlp, 0)) {
                /* decrement node reference count to trigger the release of
                 * the node.
                 */
                lpfc_nlp_put(ndlp);
                return 0;
        }
        return 1;
}

/**
 * lpfc_more_plogi: Check and issue remaining plogis for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine checks whether there are more remaining Port Logins
 * (PLOGI) to be issued for the @vport. If so, it will invoke the routine
 * lpfc_els_disc_plogi() to go through the Node Port Recovery (NPR) nodes
 * to issue ELS PLOGIs up to the configured discover threads with the
 * @vport (@vport->cfg_discovery_threads). The function also decrement
 * the @vport's num_disc_node by 1 if it is not already 0.
 **/
void
lpfc_more_plogi(struct lpfc_vport *vport)
{
        int sentplogi;

        if (vport->num_disc_nodes)
                vport->num_disc_nodes--;

        /* Continue discovery with <num_disc_nodes> PLOGIs to go */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                         "0232 Continue discovery with %d PLOGIs to go "
                         "Data: x%x x%x x%x\n",
                         vport->num_disc_nodes, vport->fc_plogi_cnt,
                         vport->fc_flag, vport->port_state);
        /* Check to see if there are more PLOGIs to be sent */
        if (vport->fc_flag & FC_NLP_MORE)
                /* go thru NPR nodes and issue any remaining ELS PLOGIs */
                sentplogi = lpfc_els_disc_plogi(vport);

        return;
}

/**
 * lpfc_plogi_confirm_nport: Confirm pologi wwpn matches stored ndlp.
 * @phba: pointer to lpfc hba data structure.
 * @prsp: pointer to response IOCB payload.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine checks and indicates whether the WWPN of an N_Port, retrieved
 * from a PLOGI, matches the WWPN that is stored in the @ndlp for that N_POrt.
 * The following cases are considered N_Port confirmed:
 * 1) The N_Port is a Fabric ndlp; 2) The @ndlp is on vport list and matches
 * the WWPN of the N_Port logged into; 3) The @ndlp is not on vport list but
 * it does not have WWPN assigned either. If the WWPN is confirmed, the
 * pointer to the @ndlp will be returned. If the WWPN is not confirmed:
 * 1) if there is a node on vport list other than the @ndlp with the same
 * WWPN of the N_Port PLOGI logged into, the lpfc_unreg_rpi() will be invoked
 * on that node to release the RPI associated with the node; 2) if there is
 * no node found on vport list with the same WWPN of the N_Port PLOGI logged
 * into, a new node shall be allocated (or activated). In either case, the
 * parameters of the @ndlp shall be copied to the new_ndlp, the @ndlp shall
 * be released and the new_ndlp shall be put on to the vport node list and
 * its pointer returned as the confirmed node.
 *
 * Note that before the @ndlp got "released", the keepDID from not-matching
 * or inactive "new_ndlp" on the vport node list is assigned to the nlp_DID
 * of the @ndlp. This is because the release of @ndlp is actually to put it
 * into an inactive state on the vport node list and the vport node list
 * management algorithm does not allow two node with a same DID.
 *
 * Return code
 *   pointer to the PLOGI N_Port @ndlp
 **/
static struct lpfc_nodelist *
lpfc_plogi_confirm_nport(struct lpfc_hba *phba, uint32_t *prsp,
                         struct lpfc_nodelist *ndlp)
{
        struct lpfc_vport    *vport = ndlp->vport;
        struct lpfc_nodelist *new_ndlp;
        struct lpfc_rport_data *rdata;
        struct fc_rport *rport;
        struct serv_parm *sp;
        uint8_t  name[sizeof(struct lpfc_name)];
        uint32_t rc, keepDID = 0;

        /* Fabric nodes can have the same WWPN so we don't bother searching
         * by WWPN.  Just return the ndlp that was given to us.
         */
        if (ndlp->nlp_type & NLP_FABRIC)
                return ndlp;

        sp = (struct serv_parm *) ((uint8_t *) prsp + sizeof(uint32_t));
        memset(name, 0, sizeof(struct lpfc_name));

        /* Now we find out if the NPort we are logging into, matches the WWPN
         * we have for that ndlp. If not, we have some work to do.
         */
        new_ndlp = lpfc_findnode_wwpn(vport, &sp->portName);

        if (new_ndlp == ndlp && NLP_CHK_NODE_ACT(new_ndlp))
                return ndlp;

        if (!new_ndlp) {
                rc = memcmp(&ndlp->nlp_portname, name,
                            sizeof(struct lpfc_name));
                if (!rc)
                        return ndlp;
                new_ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_ATOMIC);
                if (!new_ndlp)
                        return ndlp;
                lpfc_nlp_init(vport, new_ndlp, ndlp->nlp_DID);
        } else if (!NLP_CHK_NODE_ACT(new_ndlp)) {
                rc = memcmp(&ndlp->nlp_portname, name,
                            sizeof(struct lpfc_name));
                if (!rc)
                        return ndlp;
                new_ndlp = lpfc_enable_node(vport, new_ndlp,
                                                NLP_STE_UNUSED_NODE);
                if (!new_ndlp)
                        return ndlp;
                keepDID = new_ndlp->nlp_DID;
        } else
                keepDID = new_ndlp->nlp_DID;

        lpfc_unreg_rpi(vport, new_ndlp);
        new_ndlp->nlp_DID = ndlp->nlp_DID;
        new_ndlp->nlp_prev_state = ndlp->nlp_prev_state;

        if (ndlp->nlp_flag & NLP_NPR_2B_DISC)
                new_ndlp->nlp_flag |= NLP_NPR_2B_DISC;
        ndlp->nlp_flag &= ~NLP_NPR_2B_DISC;

        /* Set state will put new_ndlp on to node list if not already done */
        lpfc_nlp_set_state(vport, new_ndlp, ndlp->nlp_state);

        /* Move this back to NPR state */
        if (memcmp(&ndlp->nlp_portname, name, sizeof(struct lpfc_name)) == 0) {
                /* The new_ndlp is replacing ndlp totally, so we need
                 * to put ndlp on UNUSED list and try to free it.
                 */

                /* Fix up the rport accordingly */
                rport =  ndlp->rport;
                if (rport) {
                        rdata = rport->dd_data;
                        if (rdata->pnode == ndlp) {
                                lpfc_nlp_put(ndlp);
                                ndlp->rport = NULL;
                                rdata->pnode = lpfc_nlp_get(new_ndlp);
                                new_ndlp->rport = rport;
                        }
                        new_ndlp->nlp_type = ndlp->nlp_type;
                }
                /* We shall actually free the ndlp with both nlp_DID and
                 * nlp_portname fields equals 0 to avoid any ndlp on the
                 * nodelist never to be used.
                 */
                if (ndlp->nlp_DID == 0) {
                        spin_lock_irq(&phba->ndlp_lock);
                        NLP_SET_FREE_REQ(ndlp);
                        spin_unlock_irq(&phba->ndlp_lock);
                }

                /* Two ndlps cannot have the same did on the nodelist */
                ndlp->nlp_DID = keepDID;
                lpfc_drop_node(vport, ndlp);
        }
        else {
                lpfc_unreg_rpi(vport, ndlp);
                /* Two ndlps cannot have the same did */
                ndlp->nlp_DID = keepDID;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
        }
        return new_ndlp;
}

/**
 * lpfc_end_rscn: Check and handle more rscn for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine checks whether more Registration State Change
 * Notifications (RSCNs) came in while the discovery state machine was in
 * the FC_RSCN_MODE. If so, the lpfc_els_handle_rscn() routine will be
 * invoked to handle the additional RSCNs for the @vport. Otherwise, the
 * FC_RSCN_MODE bit will be cleared with the @vport to mark as the end of
 * handling the RSCNs.
 **/
void
lpfc_end_rscn(struct lpfc_vport *vport)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        if (vport->fc_flag & FC_RSCN_MODE) {
                /*
                 * Check to see if more RSCNs came in while we were
                 * processing this one.
                 */
                if (vport->fc_rscn_id_cnt ||
                    (vport->fc_flag & FC_RSCN_DISCOVERY) != 0)
                        lpfc_els_handle_rscn(vport);
                else {
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag &= ~FC_RSCN_MODE;
                        spin_unlock_irq(shost->host_lock);
                }
        }
}

/**
 * lpfc_cmpl_els_plogi: Completion callback function for plogi.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function for issuing the Port
 * Login (PLOGI) command. For PLOGI completion, there must be an active
 * ndlp on the vport node list that matches the remote node ID from the
 * PLOGI reponse IOCB. If such ndlp does not exist, the PLOGI is simply
 * ignored and command IOCB released. The PLOGI response IOCB status is
 * checked for error conditons. If there is error status reported, PLOGI
 * retry shall be attempted by invoking the lpfc_els_retry() routine.
 * Otherwise, the lpfc_plogi_confirm_nport() routine shall be invoked on
 * the ndlp and the NLP_EVT_CMPL_PLOGI state to the Discover State Machine
 * (DSM) is set for this PLOGI completion. Finally, it checks whether
 * there are additional N_Port nodes with the vport that need to perform
 * PLOGI. If so, the lpfc_more_plogi() routine is invoked to issue addition
 * PLOGIs.
 **/
static void
lpfc_cmpl_els_plogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_nodelist *ndlp;
        struct lpfc_dmabuf *prsp;
        int disc, rc, did, type;

        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &rspiocb->iocb;
        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "PLOGI cmpl:      status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                irsp->un.elsreq64.remoteID);

        ndlp = lpfc_findnode_did(vport, irsp->un.elsreq64.remoteID);
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0136 PLOGI completes to NPort x%x "
                                 "with no ndlp. Data: x%x x%x x%x\n",
                                 irsp->un.elsreq64.remoteID,
                                 irsp->ulpStatus, irsp->un.ulpWord[4],
                                 irsp->ulpIoTag);
                goto out;
        }

        /* Since ndlp can be freed in the disc state machine, note if this node
         * is being used during discovery.
         */
        spin_lock_irq(shost->host_lock);
        disc = (ndlp->nlp_flag & NLP_NPR_2B_DISC);
        ndlp->nlp_flag &= ~NLP_NPR_2B_DISC;
        spin_unlock_irq(shost->host_lock);
        rc   = 0;

        /* PLOGI completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0102 PLOGI completes to NPort x%x "
                         "Data: x%x x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, disc, vport->num_disc_nodes);
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport)) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
                goto out;
        }

        /* ndlp could be freed in DSM, save these values now */
        type = ndlp->nlp_type;
        did = ndlp->nlp_DID;

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb)) {
                        /* ELS command is being retried */
                        if (disc) {
                                spin_lock_irq(shost->host_lock);
                                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                                spin_unlock_irq(shost->host_lock);
                        }
                        goto out;
                }
                /* PLOGI failed */
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (lpfc_error_lost_link(irsp))
                        rc = NLP_STE_FREED_NODE;
                else
                        rc = lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                     NLP_EVT_CMPL_PLOGI);
        } else {
                /* Good status, call state machine */
                prsp = list_entry(((struct lpfc_dmabuf *)
                                   cmdiocb->context2)->list.next,
                                  struct lpfc_dmabuf, list);
                ndlp = lpfc_plogi_confirm_nport(phba, prsp->virt, ndlp);
                rc = lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                             NLP_EVT_CMPL_PLOGI);
        }

        if (disc && vport->num_disc_nodes) {
                /* Check to see if there are more PLOGIs to be sent */
                lpfc_more_plogi(vport);

                if (vport->num_disc_nodes == 0) {
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag &= ~FC_NDISC_ACTIVE;
                        spin_unlock_irq(shost->host_lock);

                        lpfc_can_disctmo(vport);
                        lpfc_end_rscn(vport);
                }
        }

out:
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_plogi: Issue an plogi iocb command for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 * @did: destination port identifier.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Port Login (PLOGI) command to a remote N_Port
 * (with the @did) for a @vport. Before issuing a PLOGI to a remote N_Port,
 * the ndlp with the remote N_Port DID must exist on the @vport's ndlp list.
 * This routine constructs the proper feilds of the PLOGI IOCB and invokes
 * the lpfc_sli_issue_iocb() routine to send out PLOGI ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the PLOGI ELS command.
 *
 * Return code
 *   0 - Successfully issued a plogi for @vport
 *   1 - failed to issue a plogi for @vport
 **/
int
lpfc_issue_els_plogi(struct lpfc_vport *vport, uint32_t did, uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        struct serv_parm *sp;
        IOCB_t *icmd;
        struct lpfc_nodelist *ndlp;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int ret;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];     /* ELS ring */

        ndlp = lpfc_findnode_did(vport, did);
        if (ndlp && !NLP_CHK_NODE_ACT(ndlp))
                ndlp = NULL;

        /* If ndlp is not NULL, we will bump the reference count on it */
        cmdsize = (sizeof(uint32_t) + sizeof(struct serv_parm));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp, did,
                                     ELS_CMD_PLOGI);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For PLOGI request, remainder of payload is service parameters */
        *((uint32_t *) (pcmd)) = ELS_CMD_PLOGI;
        pcmd += sizeof(uint32_t);
        memcpy(pcmd, &vport->fc_sparam, sizeof(struct serv_parm));
        sp = (struct serv_parm *) pcmd;

        if (sp->cmn.fcphLow < FC_PH_4_3)
                sp->cmn.fcphLow = FC_PH_4_3;

        if (sp->cmn.fcphHigh < FC_PH3)
                sp->cmn.fcphHigh = FC_PH3;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue PLOGI:     did:x%x",
                did, 0, 0);

        phba->fc_stat.elsXmitPLOGI++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_plogi;
        ret = lpfc_sli_issue_iocb(phba, pring, elsiocb, 0);

        if (ret == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_cmpl_els_prli: Completion callback function for prli.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function for a Process Login
 * (PRLI) ELS command. The PRLI response IOCB status is checked for error
 * status. If there is error status reported, PRLI retry shall be attempted
 * by invoking the lpfc_els_retry() routine. Otherwise, the state
 * NLP_EVT_CMPL_PRLI is sent to the Discover State Machine (DSM) for this
 * ndlp to mark the PRLI completion.
 **/
static void
lpfc_cmpl_els_prli(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_sli *psli;
        struct lpfc_nodelist *ndlp;

        psli = &phba->sli;
        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &(rspiocb->iocb);
        ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~NLP_PRLI_SND;
        spin_unlock_irq(shost->host_lock);

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "PRLI cmpl:       status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                ndlp->nlp_DID);
        /* PRLI completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0103 PRLI completes to NPort x%x "
                         "Data: x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, vport->num_disc_nodes);

        vport->fc_prli_sent--;
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport))
                goto out;

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb)) {
                        /* ELS command is being retried */
                        goto out;
                }
                /* PRLI failed */
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (lpfc_error_lost_link(irsp))
                        goto out;
                else
                        lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                NLP_EVT_CMPL_PRLI);
        } else
                /* Good status, call state machine */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_CMPL_PRLI);
out:
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_prli: Issue a prli iocb command for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Process Login (PRLI) ELS command for the
 * @vport. The PRLI service parameters are set up in the payload of the
 * PRLI Request command and the pointer to lpfc_cmpl_els_prli() routine
 * is put to the IOCB completion callback func field before invoking the
 * routine lpfc_sli_issue_iocb() to send out PRLI command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the PRLI ELS command.
 *
 * Return code
 *   0 - successfully issued prli iocb command for @vport
 *   1 - failed to issue prli iocb command for @vport
 **/
int
lpfc_issue_els_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                    uint8_t retry)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba *phba = vport->phba;
        PRLI *npr;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];     /* ELS ring */

        cmdsize = (sizeof(uint32_t) + sizeof(PRLI));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_PRLI);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For PRLI request, remainder of payload is service parameters */
        memset(pcmd, 0, (sizeof(PRLI) + sizeof(uint32_t)));
        *((uint32_t *) (pcmd)) = ELS_CMD_PRLI;
        pcmd += sizeof(uint32_t);

        /* For PRLI, remainder of payload is PRLI parameter page */
        npr = (PRLI *) pcmd;
        /*
         * If our firmware version is 3.20 or later,
         * set the following bits for FC-TAPE support.
         */
        if (phba->vpd.rev.feaLevelHigh >= 0x02) {
                npr->ConfmComplAllowed = 1;
                npr->Retry = 1;
                npr->TaskRetryIdReq = 1;
        }
        npr->estabImagePair = 1;
        npr->readXferRdyDis = 1;

        /* For FCP support */
        npr->prliType = PRLI_FCP_TYPE;
        npr->initiatorFunc = 1;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue PRLI:      did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitPRLI++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_prli;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_PRLI_SND;
        spin_unlock_irq(shost->host_lock);
        if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_PRLI_SND;
                spin_unlock_irq(shost->host_lock);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        vport->fc_prli_sent++;
        return 0;
}

/**
 * lpfc_rscn_disc: Perform rscn discovery for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine performs Registration State Change Notification (RSCN)
 * discovery for a @vport. If the @vport's node port recovery count is not
 * zero, it will invoke the lpfc_els_disc_plogi() to perform PLOGI for all
 * the nodes that need recovery. If none of the PLOGI were needed through
 * the lpfc_els_disc_plogi() routine, the lpfc_end_rscn() routine shall be
 * invoked to check and handle possible more RSCN came in during the period
 * of processing the current ones.
 **/
static void
lpfc_rscn_disc(struct lpfc_vport *vport)
{
        lpfc_can_disctmo(vport);

        /* RSCN discovery */
        /* go thru NPR nodes and issue ELS PLOGIs */
        if (vport->fc_npr_cnt)
                if (lpfc_els_disc_plogi(vport))
                        return;

        lpfc_end_rscn(vport);
}

/**
 * lpfc_adisc_done: Complete the adisc phase of discovery.
 * @vport: pointer to lpfc_vport hba data structure that finished all ADISCs.
 *
 * This function is called when the final ADISC is completed during discovery.
 * This function handles clearing link attention or issuing reg_vpi depending
 * on whether npiv is enabled. This function also kicks off the PLOGI phase of
 * discovery.
 * This function is called with no locks held.
 **/
static void
lpfc_adisc_done(struct lpfc_vport *vport)
{
        struct Scsi_Host   *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba   *phba = vport->phba;

        /*
         * For NPIV, cmpl_reg_vpi will set port_state to READY,
         * and continue discovery.
         */
        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
            !(vport->fc_flag & FC_RSCN_MODE)) {
                lpfc_issue_reg_vpi(phba, vport);
                return;
        }
        /*
        * For SLI2, we need to set port_state to READY
        * and continue discovery.
        */
        if (vport->port_state < LPFC_VPORT_READY) {
                /* If we get here, there is nothing to ADISC */
                if (vport->port_type == LPFC_PHYSICAL_PORT)
                        lpfc_issue_clear_la(phba, vport);
                if (!(vport->fc_flag & FC_ABORT_DISCOVERY)) {
                        vport->num_disc_nodes = 0;
                        /* go thru NPR list, issue ELS PLOGIs */
                        if (vport->fc_npr_cnt)
                                lpfc_els_disc_plogi(vport);
                        if (!vport->num_disc_nodes) {
                                spin_lock_irq(shost->host_lock);
                                vport->fc_flag &= ~FC_NDISC_ACTIVE;
                                spin_unlock_irq(shost->host_lock);
                                lpfc_can_disctmo(vport);
                                lpfc_end_rscn(vport);
                        }
                }
                vport->port_state = LPFC_VPORT_READY;
        } else
                lpfc_rscn_disc(vport);
}

/**
 * lpfc_more_adisc: Issue more adisc as needed.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine determines whether there are more ndlps on a @vport
 * node list need to have Address Discover (ADISC) issued. If so, it will
 * invoke the lpfc_els_disc_adisc() routine to issue ADISC on the @vport's
 * remaining nodes which need to have ADISC sent.
 **/
void
lpfc_more_adisc(struct lpfc_vport *vport)
{
        int sentadisc;

        if (vport->num_disc_nodes)
                vport->num_disc_nodes--;
        /* Continue discovery with <num_disc_nodes> ADISCs to go */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                         "0210 Continue discovery with %d ADISCs to go "
                         "Data: x%x x%x x%x\n",
                         vport->num_disc_nodes, vport->fc_adisc_cnt,
                         vport->fc_flag, vport->port_state);
        /* Check to see if there are more ADISCs to be sent */
        if (vport->fc_flag & FC_NLP_MORE) {
                lpfc_set_disctmo(vport);
                /* go thru NPR nodes and issue any remaining ELS ADISCs */
                sentadisc = lpfc_els_disc_adisc(vport);
        }
        if (!vport->num_disc_nodes)
                lpfc_adisc_done(vport);
        return;
}

/**
 * lpfc_cmpl_els_adisc: Completion callback function for adisc.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion function for issuing the Address Discover
 * (ADISC) command. It first checks to see whether link went down during
 * the discovery process. If so, the node will be marked as node port
 * recovery for issuing discover IOCB by the link attention handler and
 * exit. Otherwise, the response status is checked. If error was reported
 * in the response status, the ADISC command shall be retried by invoking
 * the lpfc_els_retry() routine. Otherwise, if no error was reported in
 * the response status, the state machine is invoked to set transition
 * with respect to NLP_EVT_CMPL_ADISC event.
 **/
static void
lpfc_cmpl_els_adisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_nodelist *ndlp;
        int  disc;

        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &(rspiocb->iocb);
        ndlp = (struct lpfc_nodelist *) cmdiocb->context1;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "ADISC cmpl:      status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                ndlp->nlp_DID);

        /* Since ndlp can be freed in the disc state machine, note if this node
         * is being used during discovery.
         */
        spin_lock_irq(shost->host_lock);
        disc = (ndlp->nlp_flag & NLP_NPR_2B_DISC);
        ndlp->nlp_flag &= ~(NLP_ADISC_SND | NLP_NPR_2B_DISC);
        spin_unlock_irq(shost->host_lock);
        /* ADISC completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0104 ADISC completes to NPort x%x "
                         "Data: x%x x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, disc, vport->num_disc_nodes);
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport)) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
                goto out;
        }

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb)) {
                        /* ELS command is being retried */
                        if (disc) {
                                spin_lock_irq(shost->host_lock);
                                ndlp->nlp_flag |= NLP_NPR_2B_DISC;
                                spin_unlock_irq(shost->host_lock);
                                lpfc_set_disctmo(vport);
                        }
                        goto out;
                }
                /* ADISC failed */
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (!lpfc_error_lost_link(irsp))
                        lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                NLP_EVT_CMPL_ADISC);
        } else
                /* Good status, call state machine */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_CMPL_ADISC);

        /* Check to see if there are more ADISCs to be sent */
        if (disc && vport->num_disc_nodes)
                lpfc_more_adisc(vport);
out:
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_adisc: Issue an address discover iocb to an node on a vport.
 * @vport: pointer to a virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues an Address Discover (ADISC) for an @ndlp on a
 * @vport. It prepares the payload of the ADISC ELS command, updates the
 * and states of the ndlp, and invokes the lpfc_sli_issue_iocb() routine
 * to issue the ADISC ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the ADISC ELS command.
 *
 * Return code
 *   0 - successfully issued adisc
 *   1 - failed to issue adisc
 **/
int
lpfc_issue_els_adisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     uint8_t retry)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        ADISC *ap;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring = &psli->ring[LPFC_ELS_RING];
        uint8_t *pcmd;
        uint16_t cmdsize;

        cmdsize = (sizeof(uint32_t) + sizeof(ADISC));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_ADISC);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        /* For ADISC request, remainder of payload is service parameters */
        *((uint32_t *) (pcmd)) = ELS_CMD_ADISC;
        pcmd += sizeof(uint32_t);

        /* Fill in ADISC payload */
        ap = (ADISC *) pcmd;
        ap->hardAL_PA = phba->fc_pref_ALPA;
        memcpy(&ap->portName, &vport->fc_portname, sizeof(struct lpfc_name));
        memcpy(&ap->nodeName, &vport->fc_nodename, sizeof(struct lpfc_name));
        ap->DID = be32_to_cpu(vport->fc_myDID);

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue ADISC:     did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitADISC++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_adisc;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_ADISC_SND;
        spin_unlock_irq(shost->host_lock);
        if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_ADISC_SND;
                spin_unlock_irq(shost->host_lock);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_cmpl_els_logo: Completion callback function for logo.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion function for issuing the ELS Logout (LOGO)
 * command. If no error status was reported from the LOGO response, the
 * state machine of the associated ndlp shall be invoked for transition with
 * respect to NLP_EVT_CMPL_LOGO event. Otherwise, if error status was reported,
 * the lpfc_els_retry() routine will be invoked to retry the LOGO command.
 **/
static void
lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_iocbq *rspiocb)
{
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        struct lpfc_vport *vport = ndlp->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp;
        struct lpfc_sli *psli;

        psli = &phba->sli;
        /* we pass cmdiocb to state machine which needs rspiocb as well */
        cmdiocb->context_un.rsp_iocb = rspiocb;

        irsp = &(rspiocb->iocb);
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag &= ~NLP_LOGO_SND;
        spin_unlock_irq(shost->host_lock);

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "LOGO cmpl:       status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                ndlp->nlp_DID);
        /* LOGO completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0105 LOGO completes to NPort x%x "
                         "Data: x%x x%x x%x x%x\n",
                         ndlp->nlp_DID, irsp->ulpStatus, irsp->un.ulpWord[4],
                         irsp->ulpTimeout, vport->num_disc_nodes);
        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport))
                goto out;

        if (ndlp->nlp_flag & NLP_TARGET_REMOVE) {
                /* NLP_EVT_DEVICE_RM should unregister the RPI
                 * which should abort all outstanding IOs.
                 */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_DEVICE_RM);
                goto out;
        }

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb))
                        /* ELS command is being retried */
                        goto out;
                /* LOGO failed */
                /* Do not call DSM for lpfc_els_abort'ed ELS cmds */
                if (lpfc_error_lost_link(irsp))
                        goto out;
                else
                        lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                                NLP_EVT_CMPL_LOGO);
        } else
                /* Good status, call state machine.
                 * This will unregister the rpi if needed.
                 */
                lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                        NLP_EVT_CMPL_LOGO);
out:
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_logo: Issue a logo to an node on a vport.
 * @vport: pointer to a virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine constructs and issues an ELS Logout (LOGO) iocb command
 * to a remote node, referred by an @ndlp on a @vport. It constructs the
 * payload of the IOCB, properly sets up the @ndlp state, and invokes the
 * lpfc_sli_issue_iocb() routine to send out the LOGO ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the LOGO ELS command.
 *
 * Return code
 *   0 - successfully issued logo
 *   1 - failed to issue logo
 **/
int
lpfc_issue_els_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                    uint8_t retry)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int rc;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];

        spin_lock_irq(shost->host_lock);
        if (ndlp->nlp_flag & NLP_LOGO_SND) {
                spin_unlock_irq(shost->host_lock);
                return 0;
        }
        spin_unlock_irq(shost->host_lock);

        cmdsize = (2 * sizeof(uint32_t)) + sizeof(struct lpfc_name);
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_LOGO);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
        *((uint32_t *) (pcmd)) = ELS_CMD_LOGO;
        pcmd += sizeof(uint32_t);

        /* Fill in LOGO payload */
        *((uint32_t *) (pcmd)) = be32_to_cpu(vport->fc_myDID);
        pcmd += sizeof(uint32_t);
        memcpy(pcmd, &vport->fc_portname, sizeof(struct lpfc_name));

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue LOGO:      did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitLOGO++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_logo;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_LOGO_SND;
        spin_unlock_irq(shost->host_lock);
        rc = lpfc_sli_issue_iocb(phba, pring, elsiocb, 0);

        if (rc == IOCB_ERROR) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_LOGO_SND;
                spin_unlock_irq(shost->host_lock);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_cmpl_els_cmd: Completion callback function for generic els command.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is a generic completion callback function for ELS commands.
 * Specifically, it is the callback function which does not need to perform
 * any command specific operations. It is currently used by the ELS command
 * issuing routines for the ELS State Change  Request (SCR),
 * lpfc_issue_els_scr(), and the ELS Fibre Channel Address Resolution
 * Protocol Response (FARPR) routine, lpfc_issue_els_farpr(). Other than
 * certain debug loggings, this callback function simply invokes the
 * lpfc_els_chk_latt() routine to check whether link went down during the
 * discovery process.
 **/
static void
lpfc_cmpl_els_cmd(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        IOCB_t *irsp;

        irsp = &rspiocb->iocb;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "ELS cmd cmpl:    status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                irsp->un.elsreq64.remoteID);
        /* ELS cmd tag <ulpIoTag> completes */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0106 ELS cmd tag x%x completes Data: x%x x%x x%x\n",
                         irsp->ulpIoTag, irsp->ulpStatus,
                         irsp->un.ulpWord[4], irsp->ulpTimeout);
        /* Check to see if link went down during discovery */
        lpfc_els_chk_latt(vport);
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_issue_els_scr: Issue a scr to an node on a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 * @nportid: N_Port identifier to the remote node.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a State Change Request (SCR) to a fabric node
 * on a @vport. The remote node @nportid is passed into the function. It
 * first search the @vport node list to find the matching ndlp. If no such
 * ndlp is found, a new ndlp shall be created for this (SCR) purpose. An
 * IOCB is allocated, payload prepared, and the lpfc_sli_issue_iocb()
 * routine is invoked to send the SCR IOCB.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the SCR ELS command.
 *
 * Return code
 *   0 - Successfully issued scr command
 *   1 - Failed to issue scr command
 **/
int
lpfc_issue_els_scr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        struct lpfc_nodelist *ndlp;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];     /* ELS ring */
        cmdsize = (sizeof(uint32_t) + sizeof(SCR));

        ndlp = lpfc_findnode_did(vport, nportid);
        if (!ndlp) {
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 1;
                lpfc_nlp_init(vport, ndlp, nportid);
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 1;
        }

        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_SCR);

        if (!elsiocb) {
                /* This will trigger the release of the node just
                 * allocated
                 */
                lpfc_nlp_put(ndlp);
                return 1;
        }

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        *((uint32_t *) (pcmd)) = ELS_CMD_SCR;
        pcmd += sizeof(uint32_t);

        /* For SCR, remainder of payload is SCR parameter page */
        memset(pcmd, 0, sizeof(SCR));
        ((SCR *) pcmd)->Function = SCR_FUNC_FULL;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue SCR:       did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitSCR++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_cmd;
        if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) {
                /* The additional lpfc_nlp_put will cause the following
                 * lpfc_els_free_iocb routine to trigger the rlease of
                 * the node.
                 */
                lpfc_nlp_put(ndlp);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        /* This will cause the callback-function lpfc_cmpl_els_cmd to
         * trigger the release of node.
         */
        lpfc_nlp_put(ndlp);
        return 0;
}

/**
 * lpfc_issue_els_farpr: Issue a farp to an node on a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 * @nportid: N_Port identifier to the remote node.
 * @retry: number of retries to the command IOCB.
 *
 * This routine issues a Fibre Channel Address Resolution Response
 * (FARPR) to a node on a vport. The remote node N_Port identifier (@nportid)
 * is passed into the function. It first search the @vport node list to find
 * the matching ndlp. If no such ndlp is found, a new ndlp shall be created
 * for this (FARPR) purpose. An IOCB is allocated, payload prepared, and the
 * lpfc_sli_issue_iocb() routine is invoked to send the FARPR ELS command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the PARPR ELS command.
 *
 * Return code
 *   0 - Successfully issued farpr command
 *   1 - Failed to issue farpr command
 **/
static int
lpfc_issue_els_farpr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
{
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        FARP *fp;
        uint8_t *pcmd;
        uint32_t *lp;
        uint16_t cmdsize;
        struct lpfc_nodelist *ondlp;
        struct lpfc_nodelist *ndlp;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];     /* ELS ring */
        cmdsize = (sizeof(uint32_t) + sizeof(FARP));

        ndlp = lpfc_findnode_did(vport, nportid);
        if (!ndlp) {
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        return 1;
                lpfc_nlp_init(vport, ndlp, nportid);
                lpfc_enqueue_node(vport, ndlp);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        return 1;
        }

        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_RNID);
        if (!elsiocb) {
                /* This will trigger the release of the node just
                 * allocated
                 */
                lpfc_nlp_put(ndlp);
                return 1;
        }

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        *((uint32_t *) (pcmd)) = ELS_CMD_FARPR;
        pcmd += sizeof(uint32_t);

        /* Fill in FARPR payload */
        fp = (FARP *) (pcmd);
        memset(fp, 0, sizeof(FARP));
        lp = (uint32_t *) pcmd;
        *lp++ = be32_to_cpu(nportid);
        *lp++ = be32_to_cpu(vport->fc_myDID);
        fp->Rflags = 0;
        fp->Mflags = (FARP_MATCH_PORT | FARP_MATCH_NODE);

        memcpy(&fp->RportName, &vport->fc_portname, sizeof(struct lpfc_name));
        memcpy(&fp->RnodeName, &vport->fc_nodename, sizeof(struct lpfc_name));
        ondlp = lpfc_findnode_did(vport, nportid);
        if (ondlp && NLP_CHK_NODE_ACT(ondlp)) {
                memcpy(&fp->OportName, &ondlp->nlp_portname,
                       sizeof(struct lpfc_name));
                memcpy(&fp->OnodeName, &ondlp->nlp_nodename,
                       sizeof(struct lpfc_name));
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue FARPR:     did:x%x",
                ndlp->nlp_DID, 0, 0);

        phba->fc_stat.elsXmitFARPR++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_cmd;
        if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) {
                /* The additional lpfc_nlp_put will cause the following
                 * lpfc_els_free_iocb routine to trigger the release of
                 * the node.
                 */
                lpfc_nlp_put(ndlp);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        /* This will cause the callback-function lpfc_cmpl_els_cmd to
         * trigger the release of the node.
         */
        lpfc_nlp_put(ndlp);
        return 0;
}

/**
 * lpfc_cancel_retry_delay_tmo: Cancel the timer with delayed iocb-cmd retry.
 * @vport: pointer to a host virtual N_Port data structure.
 * @nlp: pointer to a node-list data structure.
 *
 * This routine cancels the timer with a delayed IOCB-command retry for
 * a @vport's @ndlp. It stops the timer for the delayed function retrial and
 * removes the ELS retry event if it presents. In addition, if the
 * NLP_NPR_2B_DISC bit is set in the @nlp's nlp_flag bitmap, ADISC IOCB
 * commands are sent for the @vport's nodes that require issuing discovery
 * ADISC.
 **/
void
lpfc_cancel_retry_delay_tmo(struct lpfc_vport *vport, struct lpfc_nodelist *nlp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_work_evt *evtp;

        if (!(nlp->nlp_flag & NLP_DELAY_TMO))
                return;
        spin_lock_irq(shost->host_lock);
        nlp->nlp_flag &= ~NLP_DELAY_TMO;
        spin_unlock_irq(shost->host_lock);
        del_timer_sync(&nlp->nlp_delayfunc);
        nlp->nlp_last_elscmd = 0;
        if (!list_empty(&nlp->els_retry_evt.evt_listp)) {
                list_del_init(&nlp->els_retry_evt.evt_listp);
                /* Decrement nlp reference count held for the delayed retry */
                evtp = &nlp->els_retry_evt;
                lpfc_nlp_put((struct lpfc_nodelist *)evtp->evt_arg1);
        }
        if (nlp->nlp_flag & NLP_NPR_2B_DISC) {
                spin_lock_irq(shost->host_lock);
                nlp->nlp_flag &= ~NLP_NPR_2B_DISC;
                spin_unlock_irq(shost->host_lock);
                if (vport->num_disc_nodes) {
                        if (vport->port_state < LPFC_VPORT_READY) {
                                /* Check if there are more ADISCs to be sent */
                                lpfc_more_adisc(vport);
                        } else {
                                /* Check if there are more PLOGIs to be sent */
                                lpfc_more_plogi(vport);
                                if (vport->num_disc_nodes == 0) {
                                        spin_lock_irq(shost->host_lock);
                                        vport->fc_flag &= ~FC_NDISC_ACTIVE;
                                        spin_unlock_irq(shost->host_lock);
                                        lpfc_can_disctmo(vport);
                                        lpfc_end_rscn(vport);
                                }
                        }
                }
        }
        return;
}

/**
 * lpfc_els_retry_delay: Timer function with a ndlp delayed function timer.
 * @ptr: holder for the pointer to the timer function associated data (ndlp).
 *
 * This routine is invoked by the ndlp delayed-function timer to check
 * whether there is any pending ELS retry event(s) with the node. If not, it
 * simply returns. Otherwise, if there is at least one ELS delayed event, it
 * adds the delayed events to the HBA work list and invokes the
 * lpfc_worker_wake_up() routine to wake up worker thread to process the
 * event. Note that lpfc_nlp_get() is called before posting the event to
 * the work list to hold reference count of ndlp so that it guarantees the
 * reference to ndlp will still be available when the worker thread gets
 * to the event associated with the ndlp.
 **/
void
lpfc_els_retry_delay(unsigned long ptr)
{
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) ptr;
        struct lpfc_vport *vport = ndlp->vport;
        struct lpfc_hba   *phba = vport->phba;
        unsigned long flags;
        struct lpfc_work_evt  *evtp = &ndlp->els_retry_evt;

        spin_lock_irqsave(&phba->hbalock, flags);
        if (!list_empty(&evtp->evt_listp)) {
                spin_unlock_irqrestore(&phba->hbalock, flags);
                return;
        }

        /* We need to hold the node by incrementing the reference
         * count until the queued work is done
         */
        evtp->evt_arg1  = lpfc_nlp_get(ndlp);
        if (evtp->evt_arg1) {
                evtp->evt = LPFC_EVT_ELS_RETRY;
                list_add_tail(&evtp->evt_listp, &phba->work_list);
                lpfc_worker_wake_up(phba);
        }
        spin_unlock_irqrestore(&phba->hbalock, flags);
        return;
}

/**
 * lpfc_els_retry_delay_handler: Work thread handler for ndlp delayed function.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine is the worker-thread handler for processing the @ndlp delayed
 * event(s), posted by the lpfc_els_retry_delay() routine. It simply retrieves
 * the last ELS command from the associated ndlp and invokes the proper ELS
 * function according to the delayed ELS command to retry the command.
 **/
void
lpfc_els_retry_delay_handler(struct lpfc_nodelist *ndlp)
{
        struct lpfc_vport *vport = ndlp->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        uint32_t cmd, did, retry;

        spin_lock_irq(shost->host_lock);
        did = ndlp->nlp_DID;
        cmd = ndlp->nlp_last_elscmd;
        ndlp->nlp_last_elscmd = 0;

        if (!(ndlp->nlp_flag & NLP_DELAY_TMO)) {
                spin_unlock_irq(shost->host_lock);
                return;
        }

        ndlp->nlp_flag &= ~NLP_DELAY_TMO;
        spin_unlock_irq(shost->host_lock);
        /*
         * If a discovery event readded nlp_delayfunc after timer
         * firing and before processing the timer, cancel the
         * nlp_delayfunc.
         */
        del_timer_sync(&ndlp->nlp_delayfunc);
        retry = ndlp->nlp_retry;

        switch (cmd) {
        case ELS_CMD_FLOGI:
                lpfc_issue_els_flogi(vport, ndlp, retry);
                break;
        case ELS_CMD_PLOGI:
                if (!lpfc_issue_els_plogi(vport, ndlp->nlp_DID, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
                }
                break;
        case ELS_CMD_ADISC:
                if (!lpfc_issue_els_adisc(vport, ndlp, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_ADISC_ISSUE);
                }
                break;
        case ELS_CMD_PRLI:
                if (!lpfc_issue_els_prli(vport, ndlp, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PRLI_ISSUE);
                }
                break;
        case ELS_CMD_LOGO:
                if (!lpfc_issue_els_logo(vport, ndlp, retry)) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                }
                break;
        case ELS_CMD_FDISC:
                lpfc_issue_els_fdisc(vport, ndlp, retry);
                break;
        }
        return;
}

/**
 * lpfc_els_retry: Make retry decision on an els command iocb.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine makes a retry decision on an ELS command IOCB, which has
 * failed. The following ELS IOCBs use this function for retrying the command
 * when previously issued command responsed with error status: FLOGI, PLOGI,
 * PRLI, ADISC, LOGO, and FDISC. Based on the ELS command type and the
 * returned error status, it makes the decision whether a retry shall be
 * issued for the command, and whether a retry shall be made immediately or
 * delayed. In the former case, the corresponding ELS command issuing-function
 * is called to retry the command. In the later case, the ELS command shall
 * be posted to the ndlp delayed event and delayed function timer set to the
 * ndlp for the delayed command issusing.
 *
 * Return code
 *   0 - No retry of els command is made
 *   1 - Immediate or delayed retry of els command is made
 **/
static int
lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
               struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        IOCB_t *irsp = &rspiocb->iocb;
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        struct lpfc_dmabuf *pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        uint32_t *elscmd;
        struct ls_rjt stat;
        int retry = 0, maxretry = lpfc_max_els_tries, delay = 0;
        int logerr = 0;
        uint32_t cmd = 0;
        uint32_t did;


        /* Note: context2 may be 0 for internal driver abort
         * of delays ELS command.
         */

        if (pcmd && pcmd->virt) {
                elscmd = (uint32_t *) (pcmd->virt);
                cmd = *elscmd++;
        }

        if (ndlp && NLP_CHK_NODE_ACT(ndlp))
                did = ndlp->nlp_DID;
        else {
                /* We should only hit this case for retrying PLOGI */
                did = irsp->un.elsreq64.remoteID;
                ndlp = lpfc_findnode_did(vport, did);
                if ((!ndlp || !NLP_CHK_NODE_ACT(ndlp))
                    && (cmd != ELS_CMD_PLOGI))
                        return 1;
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Retry ELS:       wd7:x%x wd4:x%x did:x%x",
                *(((uint32_t *) irsp) + 7), irsp->un.ulpWord[4], ndlp->nlp_DID);

        switch (irsp->ulpStatus) {
        case IOSTAT_FCP_RSP_ERROR:
        case IOSTAT_REMOTE_STOP:
                break;

        case IOSTAT_LOCAL_REJECT:
                switch ((irsp->un.ulpWord[4] & 0xff)) {
                case IOERR_LOOP_OPEN_FAILURE:
                        if (cmd == ELS_CMD_PLOGI && cmdiocb->retry == 0)
                                delay = 1000;
                        retry = 1;
                        break;

                case IOERR_ILLEGAL_COMMAND:
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                         "0124 Retry illegal cmd x%x "
                                         "retry:x%x delay:x%x\n",
                                         cmd, cmdiocb->retry, delay);
                        retry = 1;
                        /* All command's retry policy */
                        maxretry = 8;
                        if (cmdiocb->retry > 2)
                                delay = 1000;
                        break;

                case IOERR_NO_RESOURCES:
                        logerr = 1; /* HBA out of resources */
                        retry = 1;
                        if (cmdiocb->retry > 100)
                                delay = 100;
                        maxretry = 250;
                        break;

                case IOERR_ILLEGAL_FRAME:
                        delay = 100;
                        retry = 1;
                        break;

                case IOERR_SEQUENCE_TIMEOUT:
                case IOERR_INVALID_RPI:
                        retry = 1;
                        break;
                }
                break;

        case IOSTAT_NPORT_RJT:
        case IOSTAT_FABRIC_RJT:
                if (irsp->un.ulpWord[4] & RJT_UNAVAIL_TEMP) {
                        retry = 1;
                        break;
                }
                break;

        case IOSTAT_NPORT_BSY:
        case IOSTAT_FABRIC_BSY:
                logerr = 1; /* Fabric / Remote NPort out of resources */
                retry = 1;
                break;

        case IOSTAT_LS_RJT:
                stat.un.lsRjtError = be32_to_cpu(irsp->un.ulpWord[4]);
                /* Added for Vendor specifc support
                 * Just keep retrying for these Rsn / Exp codes
                 */
                switch (stat.un.b.lsRjtRsnCode) {
                case LSRJT_UNABLE_TPC:
                        if (stat.un.b.lsRjtRsnCodeExp ==
                            LSEXP_CMD_IN_PROGRESS) {
                                if (cmd == ELS_CMD_PLOGI) {
                                        delay = 1000;
                                        maxretry = 48;
                                }
                                retry = 1;
                                break;
                        }
                        if (cmd == ELS_CMD_PLOGI) {
                                delay = 1000;
                                maxretry = lpfc_max_els_tries + 1;
                                retry = 1;
                                break;
                        }
                        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
                          (cmd == ELS_CMD_FDISC) &&
                          (stat.un.b.lsRjtRsnCodeExp == LSEXP_OUT_OF_RESOURCE)){
                                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                                 "0125 FDISC Failed (x%x). "
                                                 "Fabric out of resources\n",
                                                 stat.un.lsRjtError);
                                lpfc_vport_set_state(vport,
                                                     FC_VPORT_NO_FABRIC_RSCS);
                        }
                        break;

                case LSRJT_LOGICAL_BSY:
                        if ((cmd == ELS_CMD_PLOGI) ||
                            (cmd == ELS_CMD_PRLI)) {
                                delay = 1000;
                                maxretry = 48;
                        } else if (cmd == ELS_CMD_FDISC) {
                                /* FDISC retry policy */
                                maxretry = 48;
                                if (cmdiocb->retry >= 32)
                                        delay = 1000;
                        }
                        retry = 1;
                        break;

                case LSRJT_LOGICAL_ERR:
                        /* There are some cases where switches return this
                         * error when they are not ready and should be returning
                         * Logical Busy. We should delay every time.
                         */
                        if (cmd == ELS_CMD_FDISC &&
                            stat.un.b.lsRjtRsnCodeExp == LSEXP_PORT_LOGIN_REQ) {
                                maxretry = 3;
                                delay = 1000;
                                retry = 1;
                                break;
                        }
                case LSRJT_PROTOCOL_ERR:
                        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
                          (cmd == ELS_CMD_FDISC) &&
                          ((stat.un.b.lsRjtRsnCodeExp == LSEXP_INVALID_PNAME) ||
                          (stat.un.b.lsRjtRsnCodeExp == LSEXP_INVALID_NPORT_ID))
                          ) {
                                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                                 "0122 FDISC Failed (x%x). "
                                                 "Fabric Detected Bad WWN\n",
                                                 stat.un.lsRjtError);
                                lpfc_vport_set_state(vport,
                                                     FC_VPORT_FABRIC_REJ_WWN);
                        }
                        break;
                }
                break;

        case IOSTAT_INTERMED_RSP:
        case IOSTAT_BA_RJT:
                break;

        default:
                break;
        }

        if (did == FDMI_DID)
                retry = 1;

        if ((cmd == ELS_CMD_FLOGI) &&
            (phba->fc_topology != TOPOLOGY_LOOP) &&
            !lpfc_error_lost_link(irsp)) {
                /* FLOGI retry policy */
                retry = 1;
                maxretry = 48;
                if (cmdiocb->retry >= 32)
                        delay = 1000;
        }

        if ((++cmdiocb->retry) >= maxretry) {
                phba->fc_stat.elsRetryExceeded++;
                retry = 0;
        }

        if ((vport->load_flag & FC_UNLOADING) != 0)
                retry = 0;

        if (retry) {

                /* Retry ELS command <elsCmd> to remote NPORT <did> */
                lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                                 "0107 Retry ELS command x%x to remote "
                                 "NPORT x%x Data: x%x x%x\n",
                                 cmd, did, cmdiocb->retry, delay);

                if (((cmd == ELS_CMD_PLOGI) || (cmd == ELS_CMD_ADISC)) &&
                        ((irsp->ulpStatus != IOSTAT_LOCAL_REJECT) ||
                        ((irsp->un.ulpWord[4] & 0xff) != IOERR_NO_RESOURCES))) {
                        /* Don't reset timer for no resources */

                        /* If discovery / RSCN timer is running, reset it */
                        if (timer_pending(&vport->fc_disctmo) ||
                            (vport->fc_flag & FC_RSCN_MODE))
                                lpfc_set_disctmo(vport);
                }

                phba->fc_stat.elsXmitRetry++;
                if (ndlp && NLP_CHK_NODE_ACT(ndlp) && delay) {
                        phba->fc_stat.elsDelayRetry++;
                        ndlp->nlp_retry = cmdiocb->retry;

                        /* delay is specified in milliseconds */
                        mod_timer(&ndlp->nlp_delayfunc,
                                jiffies + msecs_to_jiffies(delay));
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag |= NLP_DELAY_TMO;
                        spin_unlock_irq(shost->host_lock);

                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        if (cmd == ELS_CMD_PRLI)
                                lpfc_nlp_set_state(vport, ndlp,
                                        NLP_STE_REG_LOGIN_ISSUE);
                        else
                                lpfc_nlp_set_state(vport, ndlp,
                                        NLP_STE_NPR_NODE);
                        ndlp->nlp_last_elscmd = cmd;

                        return 1;
                }
                switch (cmd) {
                case ELS_CMD_FLOGI:
                        lpfc_issue_els_flogi(vport, ndlp, cmdiocb->retry);
                        return 1;
                case ELS_CMD_FDISC:
                        lpfc_issue_els_fdisc(vport, ndlp, cmdiocb->retry);
                        return 1;
                case ELS_CMD_PLOGI:
                        if (ndlp && NLP_CHK_NODE_ACT(ndlp)) {
                                ndlp->nlp_prev_state = ndlp->nlp_state;
                                lpfc_nlp_set_state(vport, ndlp,
                                                   NLP_STE_PLOGI_ISSUE);
                        }
                        lpfc_issue_els_plogi(vport, did, cmdiocb->retry);
                        return 1;
                case ELS_CMD_ADISC:
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_ADISC_ISSUE);
                        lpfc_issue_els_adisc(vport, ndlp, cmdiocb->retry);
                        return 1;
                case ELS_CMD_PRLI:
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PRLI_ISSUE);
                        lpfc_issue_els_prli(vport, ndlp, cmdiocb->retry);
                        return 1;
                case ELS_CMD_LOGO:
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                        lpfc_issue_els_logo(vport, ndlp, cmdiocb->retry);
                        return 1;
                }
        }
        /* No retry ELS command <elsCmd> to remote NPORT <did> */
        if (logerr) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                         "0137 No retry ELS command x%x to remote "
                         "NPORT x%x: Out of Resources: Error:x%x/%x\n",
                         cmd, did, irsp->ulpStatus,
                         irsp->un.ulpWord[4]);
        }
        else {
                lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0108 No retry ELS command x%x to remote "
                         "NPORT x%x Retried:%d Error:x%x/%x\n",
                         cmd, did, cmdiocb->retry, irsp->ulpStatus,
                         irsp->un.ulpWord[4]);
        }
        return 0;
}

/**
 * lpfc_els_free_data: Free lpfc dma buffer and data structure with an iocb.
 * @phba: pointer to lpfc hba data structure.
 * @buf_ptr1: pointer to the lpfc DMA buffer data structure.
 *
 * This routine releases the lpfc DMA (Direct Memory Access) buffer(s)
 * associated with a command IOCB back to the lpfc DMA buffer pool. It first
 * checks to see whether there is a lpfc DMA buffer associated with the
 * response of the command IOCB. If so, it will be released before releasing
 * the lpfc DMA buffer associated with the IOCB itself.
 *
 * Return code
 *   0 - Successfully released lpfc DMA buffer (currently, always return 0)
 **/
static int
lpfc_els_free_data(struct lpfc_hba *phba, struct lpfc_dmabuf *buf_ptr1)
{
        struct lpfc_dmabuf *buf_ptr;

        /* Free the response before processing the command. */
        if (!list_empty(&buf_ptr1->list)) {
                list_remove_head(&buf_ptr1->list, buf_ptr,
                                 struct lpfc_dmabuf,
                                 list);
                lpfc_mbuf_free(phba, buf_ptr->virt, buf_ptr->phys);
                kfree(buf_ptr);
        }
        lpfc_mbuf_free(phba, buf_ptr1->virt, buf_ptr1->phys);
        kfree(buf_ptr1);
        return 0;
}

/**
 * lpfc_els_free_bpl: Free lpfc dma buffer and data structure with bpl.
 * @phba: pointer to lpfc hba data structure.
 * @buf_ptr: pointer to the lpfc dma buffer data structure.
 *
 * This routine releases the lpfc Direct Memory Access (DMA) buffer
 * associated with a Buffer Pointer List (BPL) back to the lpfc DMA buffer
 * pool.
 *
 * Return code
 *   0 - Successfully released lpfc DMA buffer (currently, always return 0)
 **/
static int
lpfc_els_free_bpl(struct lpfc_hba *phba, struct lpfc_dmabuf *buf_ptr)
{
        lpfc_mbuf_free(phba, buf_ptr->virt, buf_ptr->phys);
        kfree(buf_ptr);
        return 0;
}

/**
 * lpfc_els_free_iocb: Free a command iocb and its associated resources.
 * @phba: pointer to lpfc hba data structure.
 * @elsiocb: pointer to lpfc els command iocb data structure.
 *
 * This routine frees a command IOCB and its associated resources. The
 * command IOCB data structure contains the reference to various associated
 * resources, these fields must be set to NULL if the associated reference
 * not present:
 *   context1 - reference to ndlp
 *   context2 - reference to cmd
 *   context2->next - reference to rsp
 *   context3 - reference to bpl
 *
 * It first properly decrements the reference count held on ndlp for the
 * IOCB completion callback function. If LPFC_DELAY_MEM_FREE flag is not
 * set, it invokes the lpfc_els_free_data() routine to release the Direct
 * Memory Access (DMA) buffers associated with the IOCB. Otherwise, it
 * adds the DMA buffer the @phba data structure for the delayed release.
 * If reference to the Buffer Pointer List (BPL) is present, the
 * lpfc_els_free_bpl() routine is invoked to release the DMA memory
 * associated with BPL. Finally, the lpfc_sli_release_iocbq() routine is
 * invoked to release the IOCB data structure back to @phba IOCBQ list.
 *
 * Return code
 *   0 - Success (currently, always return 0)
 **/
int
lpfc_els_free_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *elsiocb)
{
        struct lpfc_dmabuf *buf_ptr, *buf_ptr1;
        struct lpfc_nodelist *ndlp;

        ndlp = (struct lpfc_nodelist *)elsiocb->context1;
        if (ndlp) {
                if (ndlp->nlp_flag & NLP_DEFER_RM) {
                        lpfc_nlp_put(ndlp);

                        /* If the ndlp is not being used by another discovery
                         * thread, free it.
                         */
                        if (!lpfc_nlp_not_used(ndlp)) {
                                /* If ndlp is being used by another discovery
                                 * thread, just clear NLP_DEFER_RM
                                 */
                                ndlp->nlp_flag &= ~NLP_DEFER_RM;
                        }
                }
                else
                        lpfc_nlp_put(ndlp);
                elsiocb->context1 = NULL;
        }
        /* context2  = cmd,  context2->next = rsp, context3 = bpl */
        if (elsiocb->context2) {
                if (elsiocb->iocb_flag & LPFC_DELAY_MEM_FREE) {
                        /* Firmware could still be in progress of DMAing
                         * payload, so don't free data buffer till after
                         * a hbeat.
                         */
                        elsiocb->iocb_flag &= ~LPFC_DELAY_MEM_FREE;
                        buf_ptr = elsiocb->context2;
                        elsiocb->context2 = NULL;
                        if (buf_ptr) {
                                buf_ptr1 = NULL;
                                spin_lock_irq(&phba->hbalock);
                                if (!list_empty(&buf_ptr->list)) {
                                        list_remove_head(&buf_ptr->list,
                                                buf_ptr1, struct lpfc_dmabuf,
                                                list);
                                        INIT_LIST_HEAD(&buf_ptr1->list);
                                        list_add_tail(&buf_ptr1->list,
                                                &phba->elsbuf);
                                        phba->elsbuf_cnt++;
                                }
                                INIT_LIST_HEAD(&buf_ptr->list);
                                list_add_tail(&buf_ptr->list, &phba->elsbuf);
                                phba->elsbuf_cnt++;
                                spin_unlock_irq(&phba->hbalock);
                        }
                } else {
                        buf_ptr1 = (struct lpfc_dmabuf *) elsiocb->context2;
                        lpfc_els_free_data(phba, buf_ptr1);
                }
        }

        if (elsiocb->context3) {
                buf_ptr = (struct lpfc_dmabuf *) elsiocb->context3;
                lpfc_els_free_bpl(phba, buf_ptr);
        }
        lpfc_sli_release_iocbq(phba, elsiocb);
        return 0;
}

/**
 * lpfc_cmpl_els_logo_acc: Completion callback function to logo acc response.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function to the Logout (LOGO)
 * Accept (ACC) Response ELS command. This routine is invoked to indicate
 * the completion of the LOGO process. It invokes the lpfc_nlp_not_used() to
 * release the ndlp if it has the last reference remaining (reference count
 * is 1). If succeeded (meaning ndlp released), it sets the IOCB context1
 * field to NULL to inform the following lpfc_els_free_iocb() routine no
 * ndlp reference count needs to be decremented. Otherwise, the ndlp
 * reference use-count shall be decremented by the lpfc_els_free_iocb()
 * routine. Finally, the lpfc_els_free_iocb() is invoked to release the
 * IOCB data structure.
 **/
static void
lpfc_cmpl_els_logo_acc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                       struct lpfc_iocbq *rspiocb)
{
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        struct lpfc_vport *vport = cmdiocb->vport;
        IOCB_t *irsp;

        irsp = &rspiocb->iocb;
        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                "ACC LOGO cmpl:   status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4], ndlp->nlp_DID);
        /* ACC to LOGO completes to NPort <nlp_DID> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0109 ACC to LOGO completes to NPort x%x "
                         "Data: x%x x%x x%x\n",
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);

        if (ndlp->nlp_state == NLP_STE_NPR_NODE) {
                /* NPort Recovery mode or node is just allocated */
                if (!lpfc_nlp_not_used(ndlp)) {
                        /* If the ndlp is being used by another discovery
                         * thread, just unregister the RPI.
                         */
                        lpfc_unreg_rpi(vport, ndlp);
                } else {
                        /* Indicate the node has already released, should
                         * not reference to it from within lpfc_els_free_iocb.
                         */
                        cmdiocb->context1 = NULL;
                }
        }
        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_mbx_cmpl_dflt_rpi: Completion callbk func for unreg dflt rpi mbox cmd.
 * @phba: pointer to lpfc hba data structure.
 * @pmb: pointer to the driver internal queue element for mailbox command.
 *
 * This routine is the completion callback function for unregister default
 * RPI (Remote Port Index) mailbox command to the @phba. It simply releases
 * the associated lpfc Direct Memory Access (DMA) buffer back to the pool and
 * decrements the ndlp reference count held for this completion callback
 * function. After that, it invokes the lpfc_nlp_not_used() to check
 * whether there is only one reference left on the ndlp. If so, it will
 * perform one more decrement and trigger the release of the ndlp.
 **/
void
lpfc_mbx_cmpl_dflt_rpi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
{
        struct lpfc_dmabuf *mp = (struct lpfc_dmabuf *) (pmb->context1);
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) pmb->context2;

        pmb->context1 = NULL;
        lpfc_mbuf_free(phba, mp->virt, mp->phys);
        kfree(mp);
        mempool_free(pmb, phba->mbox_mem_pool);
        if (ndlp && NLP_CHK_NODE_ACT(ndlp)) {
                lpfc_nlp_put(ndlp);
                /* This is the end of the default RPI cleanup logic for this
                 * ndlp. If no other discovery threads are using this ndlp.
                 * we should free all resources associated with it.
                 */
                lpfc_nlp_not_used(ndlp);
        }
        return;
}

/**
 * lpfc_cmpl_els_rsp: Completion callback function for els response iocb cmd.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function for ELS Response IOCB
 * command. In normal case, this callback function just properly sets the
 * nlp_flag bitmap in the ndlp data structure, if the mbox command reference
 * field in the command IOCB is not NULL, the referred mailbox command will
 * be send out, and then invokes the lpfc_els_free_iocb() routine to release
 * the IOCB. Under error conditions, such as when a LS_RJT is returned or a
 * link down event occurred during the discovery, the lpfc_nlp_not_used()
 * routine shall be invoked trying to release the ndlp if no other threads
 * are currently referring it.
 **/
static void
lpfc_cmpl_els_rsp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_iocbq *rspiocb)
{
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        struct lpfc_vport *vport = ndlp ? ndlp->vport : NULL;
        struct Scsi_Host  *shost = vport ? lpfc_shost_from_vport(vport) : NULL;
        IOCB_t  *irsp;
        uint8_t *pcmd;
        LPFC_MBOXQ_t *mbox = NULL;
        struct lpfc_dmabuf *mp = NULL;
        uint32_t ls_rjt = 0;

        irsp = &rspiocb->iocb;

        if (cmdiocb->context_un.mbox)
                mbox = cmdiocb->context_un.mbox;

        /* First determine if this is a LS_RJT cmpl. Note, this callback
         * function can have cmdiocb->contest1 (ndlp) field set to NULL.
         */
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) cmdiocb->context2)->virt);
        if (ndlp && NLP_CHK_NODE_ACT(ndlp) &&
            (*((uint32_t *) (pcmd)) == ELS_CMD_LS_RJT)) {
                /* A LS_RJT associated with Default RPI cleanup has its own
                 * seperate code path.
                 */
                if (!(ndlp->nlp_flag & NLP_RM_DFLT_RPI))
                        ls_rjt = 1;
        }

        /* Check to see if link went down during discovery */
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp) || lpfc_els_chk_latt(vport)) {
                if (mbox) {
                        mp = (struct lpfc_dmabuf *) mbox->context1;
                        if (mp) {
                                lpfc_mbuf_free(phba, mp->virt, mp->phys);
                                kfree(mp);
                        }
                        mempool_free(mbox, phba->mbox_mem_pool);
                }
                if (ndlp && NLP_CHK_NODE_ACT(ndlp) &&
                    (ndlp->nlp_flag & NLP_RM_DFLT_RPI))
                        if (lpfc_nlp_not_used(ndlp)) {
                                ndlp = NULL;
                                /* Indicate the node has already released,
                                 * should not reference to it from within
                                 * the routine lpfc_els_free_iocb.
                                 */
                                cmdiocb->context1 = NULL;
                        }
                goto out;
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                "ELS rsp cmpl:    status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4],
                cmdiocb->iocb.un.elsreq64.remoteID);
        /* ELS response tag <ulpIoTag> completes */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0110 ELS response tag x%x completes "
                         "Data: x%x x%x x%x x%x x%x x%x x%x\n",
                         cmdiocb->iocb.ulpIoTag, rspiocb->iocb.ulpStatus,
                         rspiocb->iocb.un.ulpWord[4], rspiocb->iocb.ulpTimeout,
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);
        if (mbox) {
                if ((rspiocb->iocb.ulpStatus == 0)
                    && (ndlp->nlp_flag & NLP_ACC_REGLOGIN)) {
                        lpfc_unreg_rpi(vport, ndlp);
                        /* Increment reference count to ndlp to hold the
                         * reference to ndlp for the callback function.
                         */
                        mbox->context2 = lpfc_nlp_get(ndlp);
                        mbox->vport = vport;
                        if (ndlp->nlp_flag & NLP_RM_DFLT_RPI) {
                                mbox->mbox_flag |= LPFC_MBX_IMED_UNREG;
                                mbox->mbox_cmpl = lpfc_mbx_cmpl_dflt_rpi;
                        }
                        else {
                                mbox->mbox_cmpl = lpfc_mbx_cmpl_reg_login;
                                ndlp->nlp_prev_state = ndlp->nlp_state;
                                lpfc_nlp_set_state(vport, ndlp,
                                           NLP_STE_REG_LOGIN_ISSUE);
                        }
                        if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT)
                            != MBX_NOT_FINISHED)
                                goto out;
                        else
                                /* Decrement the ndlp reference count we
                                 * set for this failed mailbox command.
                                 */
                                lpfc_nlp_put(ndlp);

                        /* ELS rsp: Cannot issue reg_login for <NPortid> */
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                "0138 ELS rsp: Cannot issue reg_login for x%x "
                                "Data: x%x x%x x%x\n",
                                ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                                ndlp->nlp_rpi);

                        if (lpfc_nlp_not_used(ndlp)) {
                                ndlp = NULL;
                                /* Indicate node has already been released,
                                 * should not reference to it from within
                                 * the routine lpfc_els_free_iocb.
                                 */
                                cmdiocb->context1 = NULL;
                        }
                } else {
                        /* Do not drop node for lpfc_els_abort'ed ELS cmds */
                        if (!lpfc_error_lost_link(irsp) &&
                            ndlp->nlp_flag & NLP_ACC_REGLOGIN) {
                                if (lpfc_nlp_not_used(ndlp)) {
                                        ndlp = NULL;
                                        /* Indicate node has already been
                                         * released, should not reference
                                         * to it from within the routine
                                         * lpfc_els_free_iocb.
                                         */
                                        cmdiocb->context1 = NULL;
                                }
                        }
                }
                mp = (struct lpfc_dmabuf *) mbox->context1;
                if (mp) {
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                }
                mempool_free(mbox, phba->mbox_mem_pool);
        }
out:
        if (ndlp && NLP_CHK_NODE_ACT(ndlp)) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~(NLP_ACC_REGLOGIN | NLP_RM_DFLT_RPI);
                spin_unlock_irq(shost->host_lock);

                /* If the node is not being used by another discovery thread,
                 * and we are sending a reject, we are done with it.
                 * Release driver reference count here and free associated
                 * resources.
                 */
                if (ls_rjt)
                        if (lpfc_nlp_not_used(ndlp))
                                /* Indicate node has already been released,
                                 * should not reference to it from within
                                 * the routine lpfc_els_free_iocb.
                                 */
                                cmdiocb->context1 = NULL;
        }

        lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_els_rsp_acc: Prepare and issue an acc response iocb command.
 * @vport: pointer to a host virtual N_Port data structure.
 * @flag: the els command code to be accepted.
 * @oldiocb: pointer to the original lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 * @mbox: pointer to the driver internal queue element for mailbox command.
 *
 * This routine prepares and issues an Accept (ACC) response IOCB
 * command. It uses the @flag to properly set up the IOCB field for the
 * specific ACC response command to be issued and invokes the
 * lpfc_sli_issue_iocb() routine to send out ACC response IOCB. If a
 * @mbox pointer is passed in, it will be put into the context_un.mbox
 * field of the IOCB for the completion callback function to issue the
 * mailbox command to the HBA later when callback is invoked.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the corresponding response ELS IOCB command.
 *
 * Return code
 *   0 - Successfully issued acc response
 *   1 - Failed to issue acc response
 **/
int
lpfc_els_rsp_acc(struct lpfc_vport *vport, uint32_t flag,
                 struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp,
                 LPFC_MBOXQ_t *mbox)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        IOCB_t *oldcmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int rc;
        ELS_PKT *els_pkt_ptr;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];     /* ELS ring */
        oldcmd = &oldiocb->iocb;

        switch (flag) {
        case ELS_CMD_ACC:
                cmdsize = sizeof(uint32_t);
                elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry,
                                             ndlp, ndlp->nlp_DID, ELS_CMD_ACC);
                if (!elsiocb) {
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag &= ~NLP_LOGO_ACC;
                        spin_unlock_irq(shost->host_lock);
                        return 1;
                }

                icmd = &elsiocb->iocb;
                icmd->ulpContext = oldcmd->ulpContext;  /* Xri */
                pcmd = (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
                *((uint32_t *) (pcmd)) = ELS_CMD_ACC;
                pcmd += sizeof(uint32_t);

                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                        "Issue ACC:       did:x%x flg:x%x",
                        ndlp->nlp_DID, ndlp->nlp_flag, 0);
                break;
        case ELS_CMD_PLOGI:
                cmdsize = (sizeof(struct serv_parm) + sizeof(uint32_t));
                elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry,
                                             ndlp, ndlp->nlp_DID, ELS_CMD_ACC);
                if (!elsiocb)
                        return 1;

                icmd = &elsiocb->iocb;
                icmd->ulpContext = oldcmd->ulpContext;  /* Xri */
                pcmd = (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

                if (mbox)
                        elsiocb->context_un.mbox = mbox;

                *((uint32_t *) (pcmd)) = ELS_CMD_ACC;
                pcmd += sizeof(uint32_t);
                memcpy(pcmd, &vport->fc_sparam, sizeof(struct serv_parm));

                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                        "Issue ACC PLOGI: did:x%x flg:x%x",
                        ndlp->nlp_DID, ndlp->nlp_flag, 0);
                break;
        case ELS_CMD_PRLO:
                cmdsize = sizeof(uint32_t) + sizeof(PRLO);
                elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry,
                                             ndlp, ndlp->nlp_DID, ELS_CMD_PRLO);
                if (!elsiocb)
                        return 1;

                icmd = &elsiocb->iocb;
                icmd->ulpContext = oldcmd->ulpContext; /* Xri */
                pcmd = (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

                memcpy(pcmd, ((struct lpfc_dmabuf *) oldiocb->context2)->virt,
                       sizeof(uint32_t) + sizeof(PRLO));
                *((uint32_t *) (pcmd)) = ELS_CMD_PRLO_ACC;
                els_pkt_ptr = (ELS_PKT *) pcmd;
                els_pkt_ptr->un.prlo.acceptRspCode = PRLO_REQ_EXECUTED;

                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                        "Issue ACC PRLO:  did:x%x flg:x%x",
                        ndlp->nlp_DID, ndlp->nlp_flag, 0);
                break;
        default:
                return 1;
        }
        /* Xmit ELS ACC response tag <ulpIoTag> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0128 Xmit ELS ACC response tag x%x, XRI: x%x, "
                         "DID: x%x, nlp_flag: x%x nlp_state: x%x RPI: x%x\n",
                         elsiocb->iotag, elsiocb->iocb.ulpContext,
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);
        if (ndlp->nlp_flag & NLP_LOGO_ACC) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_LOGO_ACC;
                spin_unlock_irq(shost->host_lock);
                elsiocb->iocb_cmpl = lpfc_cmpl_els_logo_acc;
        } else {
                elsiocb->iocb_cmpl = lpfc_cmpl_els_rsp;
        }

        phba->fc_stat.elsXmitACC++;
        rc = lpfc_sli_issue_iocb(phba, pring, elsiocb, 0);
        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_rsp_reject: Propare and issue a rjt response iocb command.
 * @vport: pointer to a virtual N_Port data structure.
 * @rejectError:
 * @oldiocb: pointer to the original lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 * @mbox: pointer to the driver internal queue element for mailbox command.
 *
 * This routine prepares and issue an Reject (RJT) response IOCB
 * command. If a @mbox pointer is passed in, it will be put into the
 * context_un.mbox field of the IOCB for the completion callback function
 * to issue to the HBA later.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the reject response ELS IOCB command.
 *
 * Return code
 *   0 - Successfully issued reject response
 *   1 - Failed to issue reject response
 **/
int
lpfc_els_rsp_reject(struct lpfc_vport *vport, uint32_t rejectError,
                    struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp,
                    LPFC_MBOXQ_t *mbox)
{
        struct lpfc_hba  *phba = vport->phba;
        IOCB_t *icmd;
        IOCB_t *oldcmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int rc;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];     /* ELS ring */

        cmdsize = 2 * sizeof(uint32_t);
        elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_LS_RJT);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        oldcmd = &oldiocb->iocb;
        icmd->ulpContext = oldcmd->ulpContext;  /* Xri */
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        *((uint32_t *) (pcmd)) = ELS_CMD_LS_RJT;
        pcmd += sizeof(uint32_t);
        *((uint32_t *) (pcmd)) = rejectError;

        if (mbox)
                elsiocb->context_un.mbox = mbox;

        /* Xmit ELS RJT <err> response tag <ulpIoTag> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0129 Xmit ELS RJT x%x response tag x%x "
                         "xri x%x, did x%x, nlp_flag x%x, nlp_state x%x, "
                         "rpi x%x\n",
                         rejectError, elsiocb->iotag,
                         elsiocb->iocb.ulpContext, ndlp->nlp_DID,
                         ndlp->nlp_flag, ndlp->nlp_state, ndlp->nlp_rpi);
        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                "Issue LS_RJT:    did:x%x flg:x%x err:x%x",
                ndlp->nlp_DID, ndlp->nlp_flag, rejectError);

        phba->fc_stat.elsXmitLSRJT++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_rsp;
        rc = lpfc_sli_issue_iocb(phba, pring, elsiocb, 0);

        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_rsp_adisc_acc: Prepare and issue acc response to adisc iocb cmd.
 * @vport: pointer to a virtual N_Port data structure.
 * @oldiocb: pointer to the original lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine prepares and issues an Accept (ACC) response to Address
 * Discover (ADISC) ELS command. It simply prepares the payload of the IOCB
 * and invokes the lpfc_sli_issue_iocb() routine to send out the command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the ADISC Accept response ELS IOCB command.
 *
 * Return code
 *   0 - Successfully issued acc adisc response
 *   1 - Failed to issue adisc acc response
 **/
int
lpfc_els_rsp_adisc_acc(struct lpfc_vport *vport, struct lpfc_iocbq *oldiocb,
                       struct lpfc_nodelist *ndlp)
{
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_sli  *psli = &phba->sli;
        struct lpfc_sli_ring *pring = &psli->ring[LPFC_ELS_RING];
        ADISC *ap;
        IOCB_t *icmd, *oldcmd;
        struct lpfc_iocbq *elsiocb;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int rc;

        cmdsize = sizeof(uint32_t) + sizeof(ADISC);
        elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_ACC);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        oldcmd = &oldiocb->iocb;
        icmd->ulpContext = oldcmd->ulpContext;  /* Xri */

        /* Xmit ADISC ACC response tag <ulpIoTag> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0130 Xmit ADISC ACC response iotag x%x xri: "
                         "x%x, did x%x, nlp_flag x%x, nlp_state x%x rpi x%x\n",
                         elsiocb->iotag, elsiocb->iocb.ulpContext,
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        *((uint32_t *) (pcmd)) = ELS_CMD_ACC;
        pcmd += sizeof(uint32_t);

        ap = (ADISC *) (pcmd);
        ap->hardAL_PA = phba->fc_pref_ALPA;
        memcpy(&ap->portName, &vport->fc_portname, sizeof(struct lpfc_name));
        memcpy(&ap->nodeName, &vport->fc_nodename, sizeof(struct lpfc_name));
        ap->DID = be32_to_cpu(vport->fc_myDID);

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                "Issue ACC ADISC: did:x%x flg:x%x",
                ndlp->nlp_DID, ndlp->nlp_flag, 0);

        phba->fc_stat.elsXmitACC++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_rsp;
        rc = lpfc_sli_issue_iocb(phba, pring, elsiocb, 0);
        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_rsp_prli_acc: Prepare and issue acc response to prli iocb cmd.
 * @vport: pointer to a virtual N_Port data structure.
 * @oldiocb: pointer to the original lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine prepares and issues an Accept (ACC) response to Process
 * Login (PRLI) ELS command. It simply prepares the payload of the IOCB
 * and invokes the lpfc_sli_issue_iocb() routine to send out the command.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the PRLI Accept response ELS IOCB command.
 *
 * Return code
 *   0 - Successfully issued acc prli response
 *   1 - Failed to issue acc prli response
 **/
int
lpfc_els_rsp_prli_acc(struct lpfc_vport *vport, struct lpfc_iocbq *oldiocb,
                      struct lpfc_nodelist *ndlp)
{
        struct lpfc_hba  *phba = vport->phba;
        PRLI *npr;
        lpfc_vpd_t *vpd;
        IOCB_t *icmd;
        IOCB_t *oldcmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int rc;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];     /* ELS ring */

        cmdsize = sizeof(uint32_t) + sizeof(PRLI);
        elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry, ndlp,
                ndlp->nlp_DID, (ELS_CMD_ACC | (ELS_CMD_PRLI & ~ELS_RSP_MASK)));
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        oldcmd = &oldiocb->iocb;
        icmd->ulpContext = oldcmd->ulpContext;  /* Xri */
        /* Xmit PRLI ACC response tag <ulpIoTag> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0131 Xmit PRLI ACC response tag x%x xri x%x, "
                         "did x%x, nlp_flag x%x, nlp_state x%x, rpi x%x\n",
                         elsiocb->iotag, elsiocb->iocb.ulpContext,
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);

        *((uint32_t *) (pcmd)) = (ELS_CMD_ACC | (ELS_CMD_PRLI & ~ELS_RSP_MASK));
        pcmd += sizeof(uint32_t);

        /* For PRLI, remainder of payload is PRLI parameter page */
        memset(pcmd, 0, sizeof(PRLI));

        npr = (PRLI *) pcmd;
        vpd = &phba->vpd;
        /*
         * If the remote port is a target and our firmware version is 3.20 or
         * later, set the following bits for FC-TAPE support.
         */
        if ((ndlp->nlp_type & NLP_FCP_TARGET) &&
            (vpd->rev.feaLevelHigh >= 0x02)) {
                npr->ConfmComplAllowed = 1;
                npr->Retry = 1;
                npr->TaskRetryIdReq = 1;
        }

        npr->acceptRspCode = PRLI_REQ_EXECUTED;
        npr->estabImagePair = 1;
        npr->readXferRdyDis = 1;
        npr->ConfmComplAllowed = 1;

        npr->prliType = PRLI_FCP_TYPE;
        npr->initiatorFunc = 1;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                "Issue ACC PRLI:  did:x%x flg:x%x",
                ndlp->nlp_DID, ndlp->nlp_flag, 0);

        phba->fc_stat.elsXmitACC++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_rsp;

        rc = lpfc_sli_issue_iocb(phba, pring, elsiocb, 0);
        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_rsp_rnid_acc: Issue rnid acc response iocb command.
 * @vport: pointer to a virtual N_Port data structure.
 * @format: rnid command format.
 * @oldiocb: pointer to the original lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine issues a Request Node Identification Data (RNID) Accept
 * (ACC) response. It constructs the RNID ACC response command according to
 * the proper @format and then calls the lpfc_sli_issue_iocb() routine to
 * issue the response. Note that this command does not need to hold the ndlp
 * reference count for the callback. So, the ndlp reference count taken by
 * the lpfc_prep_els_iocb() routine is put back and the context1 field of
 * IOCB is set to NULL to indicate to the lpfc_els_free_iocb() routine that
 * there is no ndlp reference available.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function. However, for the RNID Accept Response ELS command,
 * this is undone later by this routine after the IOCB is allocated.
 *
 * Return code
 *   0 - Successfully issued acc rnid response
 *   1 - Failed to issue acc rnid response
 **/
static int
lpfc_els_rsp_rnid_acc(struct lpfc_vport *vport, uint8_t format,
                      struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp)
{
        struct lpfc_hba  *phba = vport->phba;
        RNID *rn;
        IOCB_t *icmd, *oldcmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli_ring *pring;
        struct lpfc_sli *psli;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int rc;

        psli = &phba->sli;
        pring = &psli->ring[LPFC_ELS_RING];

        cmdsize = sizeof(uint32_t) + sizeof(uint32_t)
                                        + (2 * sizeof(struct lpfc_name));
        if (format)
                cmdsize += sizeof(RNID_TOP_DISC);

        elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_ACC);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        oldcmd = &oldiocb->iocb;
        icmd->ulpContext = oldcmd->ulpContext;  /* Xri */
        /* Xmit RNID ACC response tag <ulpIoTag> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0132 Xmit RNID ACC response tag x%x xri x%x\n",
                         elsiocb->iotag, elsiocb->iocb.ulpContext);
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
        *((uint32_t *) (pcmd)) = ELS_CMD_ACC;
        pcmd += sizeof(uint32_t);

        memset(pcmd, 0, sizeof(RNID));
        rn = (RNID *) (pcmd);
        rn->Format = format;
        rn->CommonLen = (2 * sizeof(struct lpfc_name));
        memcpy(&rn->portName, &vport->fc_portname, sizeof(struct lpfc_name));
        memcpy(&rn->nodeName, &vport->fc_nodename, sizeof(struct lpfc_name));
        switch (format) {
        case 0:
                rn->SpecificLen = 0;
                break;
        case RNID_TOPOLOGY_DISC:
                rn->SpecificLen = sizeof(RNID_TOP_DISC);
                memcpy(&rn->un.topologyDisc.portName,
                       &vport->fc_portname, sizeof(struct lpfc_name));
                rn->un.topologyDisc.unitType = RNID_HBA;
                rn->un.topologyDisc.physPort = 0;
                rn->un.topologyDisc.attachedNodes = 0;
                break;
        default:
                rn->CommonLen = 0;
                rn->SpecificLen = 0;
                break;
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_RSP,
                "Issue ACC RNID:  did:x%x flg:x%x",
                ndlp->nlp_DID, ndlp->nlp_flag, 0);

        phba->fc_stat.elsXmitACC++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_rsp;
        lpfc_nlp_put(ndlp);
        elsiocb->context1 = NULL;  /* Don't need ndlp for cmpl,
                                    * it could be freed */

        rc = lpfc_sli_issue_iocb(phba, pring, elsiocb, 0);
        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_disc_adisc: Issue remaining adisc iocbs to npr nodes of a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues Address Discover (ADISC) ELS commands to those
 * N_Ports which are in node port recovery state and ADISC has not been issued
 * for the @vport. Each time an ELS ADISC IOCB is issued by invoking the
 * lpfc_issue_els_adisc() routine, the per @vport number of discover count
 * (num_disc_nodes) shall be incremented. If the num_disc_nodes reaches a
 * pre-configured threshold (cfg_discovery_threads), the @vport fc_flag will
 * be marked with FC_NLP_MORE bit and the process of issuing remaining ADISC
 * IOCBs quit for later pick up. On the other hand, after walking through
 * all the ndlps with the @vport and there is none ADISC IOCB issued, the
 * @vport fc_flag shall be cleared with FC_NLP_MORE bit indicating there is
 * no more ADISC need to be sent.
 *
 * Return code
 *    The number of N_Ports with adisc issued.
 **/
int
lpfc_els_disc_adisc(struct lpfc_vport *vport)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_nodelist *ndlp, *next_ndlp;
        int sentadisc = 0;

        /* go thru NPR nodes and issue any remaining ELS ADISCs */
        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
                if (!NLP_CHK_NODE_ACT(ndlp))
                        continue;
                if (ndlp->nlp_state == NLP_STE_NPR_NODE &&
                    (ndlp->nlp_flag & NLP_NPR_2B_DISC) != 0 &&
                    (ndlp->nlp_flag & NLP_NPR_ADISC) != 0) {
                        spin_lock_irq(shost->host_lock);
                        ndlp->nlp_flag &= ~NLP_NPR_ADISC;
                        spin_unlock_irq(shost->host_lock);
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_ADISC_ISSUE);
                        lpfc_issue_els_adisc(vport, ndlp, 0);
                        sentadisc++;
                        vport->num_disc_nodes++;
                        if (vport->num_disc_nodes >=
                            vport->cfg_discovery_threads) {
                                spin_lock_irq(shost->host_lock);
                                vport->fc_flag |= FC_NLP_MORE;
                                spin_unlock_irq(shost->host_lock);
                                break;
                        }
                }
        }
        if (sentadisc == 0) {
                spin_lock_irq(shost->host_lock);
                vport->fc_flag &= ~FC_NLP_MORE;
                spin_unlock_irq(shost->host_lock);
        }
        return sentadisc;
}

/**
 * lpfc_els_disc_plogi: Issue plogi for all npr nodes of a vport before adisc.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine issues Port Login (PLOGI) ELS commands to all the N_Ports
 * which are in node port recovery state, with a @vport. Each time an ELS
 * ADISC PLOGI IOCB is issued by invoking the lpfc_issue_els_plogi() routine,
 * the per @vport number of discover count (num_disc_nodes) shall be
 * incremented. If the num_disc_nodes reaches a pre-configured threshold
 * (cfg_discovery_threads), the @vport fc_flag will be marked with FC_NLP_MORE
 * bit set and quit the process of issuing remaining ADISC PLOGIN IOCBs for
 * later pick up. On the other hand, after walking through all the ndlps with
 * the @vport and there is none ADISC PLOGI IOCB issued, the @vport fc_flag
 * shall be cleared with the FC_NLP_MORE bit indicating there is no more ADISC
 * PLOGI need to be sent.
 *
 * Return code
 *   The number of N_Ports with plogi issued.
 **/
int
lpfc_els_disc_plogi(struct lpfc_vport *vport)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_nodelist *ndlp, *next_ndlp;
        int sentplogi = 0;

        /* go thru NPR nodes and issue any remaining ELS PLOGIs */
        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
                if (!NLP_CHK_NODE_ACT(ndlp))
                        continue;
                if (ndlp->nlp_state == NLP_STE_NPR_NODE &&
                    (ndlp->nlp_flag & NLP_NPR_2B_DISC) != 0 &&
                    (ndlp->nlp_flag & NLP_DELAY_TMO) == 0 &&
                    (ndlp->nlp_flag & NLP_NPR_ADISC) == 0) {
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
                        lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0);
                        sentplogi++;
                        vport->num_disc_nodes++;
                        if (vport->num_disc_nodes >=
                            vport->cfg_discovery_threads) {
                                spin_lock_irq(shost->host_lock);
                                vport->fc_flag |= FC_NLP_MORE;
                                spin_unlock_irq(shost->host_lock);
                                break;
                        }
                }
        }
        if (sentplogi) {
                lpfc_set_disctmo(vport);
        }
        else {
                spin_lock_irq(shost->host_lock);
                vport->fc_flag &= ~FC_NLP_MORE;
                spin_unlock_irq(shost->host_lock);
        }
        return sentplogi;
}

/**
 * lpfc_els_flush_rscn: Clean up any rscn activities with a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine cleans up any Registration State Change Notification
 * (RSCN) activity with a @vport. Note that the fc_rscn_flush flag of the
 * @vport together with the host_lock is used to prevent multiple thread
 * trying to access the RSCN array on a same @vport at the same time.
 **/
void
lpfc_els_flush_rscn(struct lpfc_vport *vport)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        int i;

        spin_lock_irq(shost->host_lock);
        if (vport->fc_rscn_flush) {
                /* Another thread is walking fc_rscn_id_list on this vport */
                spin_unlock_irq(shost->host_lock);
                return;
        }
        /* Indicate we are walking lpfc_els_flush_rscn on this vport */
        vport->fc_rscn_flush = 1;
        spin_unlock_irq(shost->host_lock);

        for (i = 0; i < vport->fc_rscn_id_cnt; i++) {
                lpfc_in_buf_free(phba, vport->fc_rscn_id_list[i]);
                vport->fc_rscn_id_list[i] = NULL;
        }
        spin_lock_irq(shost->host_lock);
        vport->fc_rscn_id_cnt = 0;
        vport->fc_flag &= ~(FC_RSCN_MODE | FC_RSCN_DISCOVERY);
        spin_unlock_irq(shost->host_lock);
        lpfc_can_disctmo(vport);
        /* Indicate we are done walking this fc_rscn_id_list */
        vport->fc_rscn_flush = 0;
}

/**
 * lpfc_rscn_payload_check: Check whether there is a pending rscn to a did.
 * @vport: pointer to a host virtual N_Port data structure.
 * @did: remote destination port identifier.
 *
 * This routine checks whether there is any pending Registration State
 * Configuration Notification (RSCN) to a @did on @vport.
 *
 * Return code
 *   None zero - The @did matched with a pending rscn
 *   0 - not able to match @did with a pending rscn
 **/
int
lpfc_rscn_payload_check(struct lpfc_vport *vport, uint32_t did)
{
        D_ID ns_did;
        D_ID rscn_did;
        uint32_t *lp;
        uint32_t payload_len, i;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        ns_did.un.word = did;

        /* Never match fabric nodes for RSCNs */
        if ((did & Fabric_DID_MASK) == Fabric_DID_MASK)
                return 0;

        /* If we are doing a FULL RSCN rediscovery, match everything */
        if (vport->fc_flag & FC_RSCN_DISCOVERY)
                return did;

        spin_lock_irq(shost->host_lock);
        if (vport->fc_rscn_flush) {
                /* Another thread is walking fc_rscn_id_list on this vport */
                spin_unlock_irq(shost->host_lock);
                return 0;
        }
        /* Indicate we are walking fc_rscn_id_list on this vport */
        vport->fc_rscn_flush = 1;
        spin_unlock_irq(shost->host_lock);
        for (i = 0; i < vport->fc_rscn_id_cnt; i++) {
                lp = vport->fc_rscn_id_list[i]->virt;
                payload_len = be32_to_cpu(*lp++ & ~ELS_CMD_MASK);
                payload_len -= sizeof(uint32_t);        /* take off word 0 */
                while (payload_len) {
                        rscn_did.un.word = be32_to_cpu(*lp++);
                        payload_len -= sizeof(uint32_t);
                        switch (rscn_did.un.b.resv) {
                        case 0: /* Single N_Port ID effected */
                                if (ns_did.un.word == rscn_did.un.word)
                                        goto return_did_out;
                                break;
                        case 1: /* Whole N_Port Area effected */
                                if ((ns_did.un.b.domain == rscn_did.un.b.domain)
                                    && (ns_did.un.b.area == rscn_did.un.b.area))
                                        goto return_did_out;
                                break;
                        case 2: /* Whole N_Port Domain effected */
                                if (ns_did.un.b.domain == rscn_did.un.b.domain)
                                        goto return_did_out;
                                break;
                        default:
                                /* Unknown Identifier in RSCN node */
                                lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
                                                 "0217 Unknown Identifier in "
                                                 "RSCN payload Data: x%x\n",
                                                 rscn_did.un.word);
                        case 3: /* Whole Fabric effected */
                                goto return_did_out;
                        }
                }
        }
        /* Indicate we are done with walking fc_rscn_id_list on this vport */
        vport->fc_rscn_flush = 0;
        return 0;
return_did_out:
        /* Indicate we are done with walking fc_rscn_id_list on this vport */
        vport->fc_rscn_flush = 0;
        return did;
}

/**
 * lpfc_rscn_recovery_check: Send recovery event to vport nodes matching rscn
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine sends recovery (NLP_EVT_DEVICE_RECOVERY) event to the
 * state machine for a @vport's nodes that are with pending RSCN (Registration
 * State Change Notification).
 *
 * Return code
 *   0 - Successful (currently alway return 0)
 **/
static int
lpfc_rscn_recovery_check(struct lpfc_vport *vport)
{
        struct lpfc_nodelist *ndlp = NULL;

        /* Move all affected nodes by pending RSCNs to NPR state. */
        list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {
                if (!NLP_CHK_NODE_ACT(ndlp) ||
                    (ndlp->nlp_state == NLP_STE_UNUSED_NODE) ||
                    !lpfc_rscn_payload_check(vport, ndlp->nlp_DID))
                        continue;
                lpfc_disc_state_machine(vport, ndlp, NULL,
                                        NLP_EVT_DEVICE_RECOVERY);
                lpfc_cancel_retry_delay_tmo(vport, ndlp);
        }
        return 0;
}

/**
 * lpfc_els_rcv_rscn: Process an unsolicited rscn iocb.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes an unsolicited RSCN (Registration State Change
 * Notification) IOCB. First, the payload of the unsolicited RSCN is walked
 * to invoke fc_host_post_event() routine to the FC transport layer. If the
 * discover state machine is about to begin discovery, it just accepts the
 * RSCN and the discovery process will satisfy the RSCN. If this RSCN only
 * contains N_Port IDs for other vports on this HBA, it just accepts the
 * RSCN and ignore processing it. If the state machine is in the recovery
 * state, the fc_rscn_id_list of this @vport is walked and the
 * lpfc_rscn_recovery_check() routine is invoked to send recovery event for
 * all nodes that match RSCN payload. Otherwise, the lpfc_els_handle_rscn()
 * routine is invoked to handle the RSCN event.
 *
 * Return code
 *   0 - Just sent the acc response
 *   1 - Sent the acc response and waited for name server completion
 **/
static int
lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_nodelist *ndlp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_dmabuf *pcmd;
        uint32_t *lp, *datap;
        IOCB_t *icmd;
        uint32_t payload_len, length, nportid, *cmd;
        int rscn_cnt;
        int rscn_id = 0, hba_id = 0;
        int i;

        icmd = &cmdiocb->iocb;
        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;

        payload_len = be32_to_cpu(*lp++ & ~ELS_CMD_MASK);
        payload_len -= sizeof(uint32_t);        /* take off word 0 */
        /* RSCN received */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                         "0214 RSCN received Data: x%x x%x x%x x%x\n",
                         vport->fc_flag, payload_len, *lp,
                         vport->fc_rscn_id_cnt);
        for (i = 0; i < payload_len/sizeof(uint32_t); i++)
                fc_host_post_event(shost, fc_get_event_number(),
                        FCH_EVT_RSCN, lp[i]);

        /* If we are about to begin discovery, just ACC the RSCN.
         * Discovery processing will satisfy it.
         */
        if (vport->port_state <= LPFC_NS_QRY) {
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV RSCN ignore: did:x%x/ste:x%x flg:x%x",
                        ndlp->nlp_DID, vport->port_state, ndlp->nlp_flag);

                lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
                return 0;
        }

        /* If this RSCN just contains NPortIDs for other vports on this HBA,
         * just ACC and ignore it.
         */
        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
                !(vport->cfg_peer_port_login)) {
                i = payload_len;
                datap = lp;
                while (i > 0) {
                        nportid = *datap++;
                        nportid = ((be32_to_cpu(nportid)) & Mask_DID);
                        i -= sizeof(uint32_t);
                        rscn_id++;
                        if (lpfc_find_vport_by_did(phba, nportid))
                                hba_id++;
                }
                if (rscn_id == hba_id) {
                        /* ALL NPortIDs in RSCN are on HBA */
                        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                                         "0219 Ignore RSCN "
                                         "Data: x%x x%x x%x x%x\n",
                                         vport->fc_flag, payload_len,
                                         *lp, vport->fc_rscn_id_cnt);
                        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                                "RCV RSCN vport:  did:x%x/ste:x%x flg:x%x",
                                ndlp->nlp_DID, vport->port_state,
                                ndlp->nlp_flag);

                        lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb,
                                ndlp, NULL);
                        return 0;
                }
        }

        spin_lock_irq(shost->host_lock);
        if (vport->fc_rscn_flush) {
                /* Another thread is walking fc_rscn_id_list on this vport */
                spin_unlock_irq(shost->host_lock);
                vport->fc_flag |= FC_RSCN_DISCOVERY;
                /* Send back ACC */
                lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
                return 0;
        }
        /* Indicate we are walking fc_rscn_id_list on this vport */
        vport->fc_rscn_flush = 1;
        spin_unlock_irq(shost->host_lock);
        /* Get the array count after sucessfully have the token */
        rscn_cnt = vport->fc_rscn_id_cnt;
        /* If we are already processing an RSCN, save the received
         * RSCN payload buffer, cmdiocb->context2 to process later.
         */
        if (vport->fc_flag & (FC_RSCN_MODE | FC_NDISC_ACTIVE)) {
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV RSCN defer:  did:x%x/ste:x%x flg:x%x",
                        ndlp->nlp_DID, vport->port_state, ndlp->nlp_flag);

                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_RSCN_DEFERRED;
                if ((rscn_cnt < FC_MAX_HOLD_RSCN) &&
                    !(vport->fc_flag & FC_RSCN_DISCOVERY)) {
                        vport->fc_flag |= FC_RSCN_MODE;
                        spin_unlock_irq(shost->host_lock);
                        if (rscn_cnt) {
                                cmd = vport->fc_rscn_id_list[rscn_cnt-1]->virt;
                                length = be32_to_cpu(*cmd & ~ELS_CMD_MASK);
                        }
                        if ((rscn_cnt) &&
                            (payload_len + length <= LPFC_BPL_SIZE)) {
                                *cmd &= ELS_CMD_MASK;
                                *cmd |= cpu_to_be32(payload_len + length);
                                memcpy(((uint8_t *)cmd) + length, lp,
                                       payload_len);
                        } else {
                                vport->fc_rscn_id_list[rscn_cnt] = pcmd;
                                vport->fc_rscn_id_cnt++;
                                /* If we zero, cmdiocb->context2, the calling
                                 * routine will not try to free it.
                                 */
                                cmdiocb->context2 = NULL;
                        }
                        /* Deferred RSCN */
                        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                                         "0235 Deferred RSCN "
                                         "Data: x%x x%x x%x\n",
                                         vport->fc_rscn_id_cnt, vport->fc_flag,
                                         vport->port_state);
                } else {
                        vport->fc_flag |= FC_RSCN_DISCOVERY;
                        spin_unlock_irq(shost->host_lock);
                        /* ReDiscovery RSCN */
                        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                                         "0234 ReDiscovery RSCN "
                                         "Data: x%x x%x x%x\n",
                                         vport->fc_rscn_id_cnt, vport->fc_flag,
                                         vport->port_state);
                }
                /* Indicate we are done walking fc_rscn_id_list on this vport */
                vport->fc_rscn_flush = 0;
                /* Send back ACC */
                lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
                /* send RECOVERY event for ALL nodes that match RSCN payload */
                lpfc_rscn_recovery_check(vport);
                spin_lock_irq(shost->host_lock);
                vport->fc_flag &= ~FC_RSCN_DEFERRED;
                spin_unlock_irq(shost->host_lock);
                return 0;
        }
        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                "RCV RSCN:        did:x%x/ste:x%x flg:x%x",
                ndlp->nlp_DID, vport->port_state, ndlp->nlp_flag);

        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_RSCN_MODE;
        spin_unlock_irq(shost->host_lock);
        vport->fc_rscn_id_list[vport->fc_rscn_id_cnt++] = pcmd;
        /* Indicate we are done walking fc_rscn_id_list on this vport */
        vport->fc_rscn_flush = 0;
        /*
         * If we zero, cmdiocb->context2, the calling routine will
         * not try to free it.
         */
        cmdiocb->context2 = NULL;
        lpfc_set_disctmo(vport);
        /* Send back ACC */
        lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
        /* send RECOVERY event for ALL nodes that match RSCN payload */
        lpfc_rscn_recovery_check(vport);
        return lpfc_els_handle_rscn(vport);
}

/**
 * lpfc_els_handle_rscn: Handle rscn for a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine handles the Registration State Configuration Notification
 * (RSCN) for a @vport. If login to NameServer does not exist, a new ndlp shall
 * be created and a Port Login (PLOGI) to the NameServer is issued. Otherwise,
 * if the ndlp to NameServer exists, a Common Transport (CT) command to the
 * NameServer shall be issued. If CT command to the NameServer fails to be
 * issued, the lpfc_els_flush_rscn() routine shall be invoked to clean up any
 * RSCN activities with the @vport.
 *
 * Return code
 *   0 - Cleaned up rscn on the @vport
 *   1 - Wait for plogi to name server before proceed
 **/
int
lpfc_els_handle_rscn(struct lpfc_vport *vport)
{
        struct lpfc_nodelist *ndlp;
        struct lpfc_hba *phba = vport->phba;

        /* Ignore RSCN if the port is being torn down. */
        if (vport->load_flag & FC_UNLOADING) {
                lpfc_els_flush_rscn(vport);
                return 0;
        }

        /* Start timer for RSCN processing */
        lpfc_set_disctmo(vport);

        /* RSCN processed */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
                         "0215 RSCN processed Data: x%x x%x x%x x%x\n",
                         vport->fc_flag, 0, vport->fc_rscn_id_cnt,
                         vport->port_state);

        /* To process RSCN, first compare RSCN data with NameServer */
        vport->fc_ns_retry = 0;
        vport->num_disc_nodes = 0;

        ndlp = lpfc_findnode_did(vport, NameServer_DID);
        if (ndlp && NLP_CHK_NODE_ACT(ndlp)
            && ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) {
                /* Good ndlp, issue CT Request to NameServer */
                if (lpfc_ns_cmd(vport, SLI_CTNS_GID_FT, 0, 0) == 0)
                        /* Wait for NameServer query cmpl before we can
                           continue */
                        return 1;
        } else {
                /* If login to NameServer does not exist, issue one */
                /* Good status, issue PLOGI to NameServer */
                ndlp = lpfc_findnode_did(vport, NameServer_DID);
                if (ndlp && NLP_CHK_NODE_ACT(ndlp))
                        /* Wait for NameServer login cmpl before we can
                           continue */
                        return 1;

                if (ndlp) {
                        ndlp = lpfc_enable_node(vport, ndlp,
                                                NLP_STE_PLOGI_ISSUE);
                        if (!ndlp) {
                                lpfc_els_flush_rscn(vport);
                                return 0;
                        }
                        ndlp->nlp_prev_state = NLP_STE_UNUSED_NODE;
                } else {
                        ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                        if (!ndlp) {
                                lpfc_els_flush_rscn(vport);
                                return 0;
                        }
                        lpfc_nlp_init(vport, ndlp, NameServer_DID);
                        ndlp->nlp_prev_state = ndlp->nlp_state;
                        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
                }
                ndlp->nlp_type |= NLP_FABRIC;
                lpfc_issue_els_plogi(vport, NameServer_DID, 0);
                /* Wait for NameServer login cmpl before we can
                 * continue
                 */
                return 1;
        }

        lpfc_els_flush_rscn(vport);
        return 0;
}

/**
 * lpfc_els_rcv_flogi: Process an unsolicited flogi iocb.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes Fabric Login (FLOGI) IOCB received as an ELS
 * unsolicited event. An unsolicited FLOGI can be received in a point-to-
 * point topology. As an unsolicited FLOGI should not be received in a loop
 * mode, any unsolicited FLOGI received in loop mode shall be ignored. The
 * lpfc_check_sparm() routine is invoked to check the parameters in the
 * unsolicited FLOGI. If parameters validation failed, the routine
 * lpfc_els_rsp_reject() shall be called with reject reason code set to
 * LSEXP_SPARM_OPTIONS to reject the FLOGI. Otherwise, the Port WWN in the
 * FLOGI shall be compared with the Port WWN of the @vport to determine who
 * will initiate PLOGI. The higher lexicographical value party shall has
 * higher priority (as the winning port) and will initiate PLOGI and
 * communicate Port_IDs (Addresses) for both nodes in PLOGI. The result
 * of this will be marked in the @vport fc_flag field with FC_PT2PT_PLOGI
 * and then the lpfc_els_rsp_acc() routine is invoked to accept the FLOGI.
 *
 * Return code
 *   0 - Successfully processed the unsolicited flogi
 *   1 - Failed to process the unsolicited flogi
 **/
static int
lpfc_els_rcv_flogi(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_nodelist *ndlp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_dmabuf *pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        uint32_t *lp = (uint32_t *) pcmd->virt;
        IOCB_t *icmd = &cmdiocb->iocb;
        struct serv_parm *sp;
        LPFC_MBOXQ_t *mbox;
        struct ls_rjt stat;
        uint32_t cmd, did;
        int rc;

        cmd = *lp++;
        sp = (struct serv_parm *) lp;

        /* FLOGI received */

        lpfc_set_disctmo(vport);

        if (phba->fc_topology == TOPOLOGY_LOOP) {
                /* We should never receive a FLOGI in loop mode, ignore it */
                did = icmd->un.elsreq64.remoteID;

                /* An FLOGI ELS command <elsCmd> was received from DID <did> in
                   Loop Mode */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0113 An FLOGI ELS command x%x was "
                                 "received from DID x%x in Loop Mode\n",
                                 cmd, did);
                return 1;
        }

        did = Fabric_DID;

        if ((lpfc_check_sparm(vport, ndlp, sp, CLASS3))) {
                /* For a FLOGI we accept, then if our portname is greater
                 * then the remote portname we initiate Nport login.
                 */

                rc = memcmp(&vport->fc_portname, &sp->portName,
                            sizeof(struct lpfc_name));

                if (!rc) {
                        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
                        if (!mbox)
                                return 1;

                        lpfc_linkdown(phba);
                        lpfc_init_link(phba, mbox,
                                       phba->cfg_topology,
                                       phba->cfg_link_speed);
                        mbox->mb.un.varInitLnk.lipsr_AL_PA = 0;
                        mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                        mbox->vport = vport;
                        rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
                        lpfc_set_loopback_flag(phba);
                        if (rc == MBX_NOT_FINISHED) {
                                mempool_free(mbox, phba->mbox_mem_pool);
                        }
                        return 1;
                } else if (rc > 0) {    /* greater than */
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag |= FC_PT2PT_PLOGI;
                        spin_unlock_irq(shost->host_lock);
                }
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_PT2PT;
                vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
                spin_unlock_irq(shost->host_lock);
        } else {
                /* Reject this request because invalid parameters */
                stat.un.b.lsRjtRsvd0 = 0;
                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_SPARM_OPTIONS;
                stat.un.b.vendorUnique = 0;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                        NULL);
                return 1;
        }

        /* Send back ACC */
        lpfc_els_rsp_acc(vport, ELS_CMD_PLOGI, cmdiocb, ndlp, NULL);

        return 0;
}

/**
 * lpfc_els_rcv_rnid: Process an unsolicited rnid iocb.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes Request Node Identification Data (RNID) IOCB
 * received as an ELS unsolicited event. Only when the RNID specified format
 * 0x0 or 0xDF (Topology Discovery Specific Node Identification Data)
 * present, this routine will invoke the lpfc_els_rsp_rnid_acc() routine to
 * Accept (ACC) the RNID ELS command. All the other RNID formats are
 * rejected by invoking the lpfc_els_rsp_reject() routine.
 *
 * Return code
 *   0 - Successfully processed rnid iocb (currently always return 0)
 **/
static int
lpfc_els_rcv_rnid(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_nodelist *ndlp)
{
        struct lpfc_dmabuf *pcmd;
        uint32_t *lp;
        IOCB_t *icmd;
        RNID *rn;
        struct ls_rjt stat;
        uint32_t cmd, did;

        icmd = &cmdiocb->iocb;
        did = icmd->un.elsreq64.remoteID;
        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;

        cmd = *lp++;
        rn = (RNID *) lp;

        /* RNID received */

        switch (rn->Format) {
        case 0:
        case RNID_TOPOLOGY_DISC:
                /* Send back ACC */
                lpfc_els_rsp_rnid_acc(vport, rn->Format, cmdiocb, ndlp);
                break;
        default:
                /* Reject this request because format not supported */
                stat.un.b.lsRjtRsvd0 = 0;
                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_CANT_GIVE_DATA;
                stat.un.b.vendorUnique = 0;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                        NULL);
        }
        return 0;
}

/**
 * lpfc_els_rcv_lirr: Process an unsolicited lirr iocb.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes a Link Incident Report Registration(LIRR) IOCB
 * received as an ELS unsolicited event. Currently, this function just invokes
 * the lpfc_els_rsp_reject() routine to reject the LIRR IOCB unconditionally.
 *
 * Return code
 *   0 - Successfully processed lirr iocb (currently always return 0)
 **/
static int
lpfc_els_rcv_lirr(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_nodelist *ndlp)
{
        struct ls_rjt stat;

        /* For now, unconditionally reject this command */
        stat.un.b.lsRjtRsvd0 = 0;
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_CANT_GIVE_DATA;
        stat.un.b.vendorUnique = 0;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return 0;
}

/**
 * lpfc_els_rsp_rps_acc: Completion callbk func for MBX_READ_LNK_STAT mbox cmd.
 * @phba: pointer to lpfc hba data structure.
 * @pmb: pointer to the driver internal queue element for mailbox command.
 *
 * This routine is the completion callback function for the MBX_READ_LNK_STAT
 * mailbox command. This callback function is to actually send the Accept
 * (ACC) response to a Read Port Status (RPS) unsolicited IOCB event. It
 * collects the link statistics from the completion of the MBX_READ_LNK_STAT
 * mailbox command, constructs the RPS response with the link statistics
 * collected, and then invokes the lpfc_sli_issue_iocb() routine to send ACC
 * response to the RPS.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the RPS Accept Response ELS IOCB command.
 *
 **/
static void
lpfc_els_rsp_rps_acc(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
{
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring = &psli->ring[LPFC_ELS_RING];
        MAILBOX_t *mb;
        IOCB_t *icmd;
        RPS_RSP *rps_rsp;
        uint8_t *pcmd;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_nodelist *ndlp;
        uint16_t xri, status;
        uint32_t cmdsize;

        mb = &pmb->mb;

        ndlp = (struct lpfc_nodelist *) pmb->context2;
        xri = (uint16_t) ((unsigned long)(pmb->context1));
        pmb->context1 = NULL;
        pmb->context2 = NULL;

        if (mb->mbxStatus) {
                mempool_free(pmb, phba->mbox_mem_pool);
                return;
        }

        cmdsize = sizeof(RPS_RSP) + sizeof(uint32_t);
        mempool_free(pmb, phba->mbox_mem_pool);
        elsiocb = lpfc_prep_els_iocb(phba->pport, 0, cmdsize,
                                     lpfc_max_els_tries, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_ACC);

        /* Decrement the ndlp reference count from previous mbox command */
        lpfc_nlp_put(ndlp);

        if (!elsiocb)
                return;

        icmd = &elsiocb->iocb;
        icmd->ulpContext = xri;

        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
        *((uint32_t *) (pcmd)) = ELS_CMD_ACC;
        pcmd += sizeof(uint32_t); /* Skip past command */
        rps_rsp = (RPS_RSP *)pcmd;

        if (phba->fc_topology != TOPOLOGY_LOOP)
                status = 0x10;
        else
                status = 0x8;
        if (phba->pport->fc_flag & FC_FABRIC)
                status |= 0x4;

        rps_rsp->rsvd1 = 0;
        rps_rsp->portStatus = cpu_to_be16(status);
        rps_rsp->linkFailureCnt = cpu_to_be32(mb->un.varRdLnk.linkFailureCnt);
        rps_rsp->lossSyncCnt = cpu_to_be32(mb->un.varRdLnk.lossSyncCnt);
        rps_rsp->lossSignalCnt = cpu_to_be32(mb->un.varRdLnk.lossSignalCnt);
        rps_rsp->primSeqErrCnt = cpu_to_be32(mb->un.varRdLnk.primSeqErrCnt);
        rps_rsp->invalidXmitWord = cpu_to_be32(mb->un.varRdLnk.invalidXmitWord);
        rps_rsp->crcCnt = cpu_to_be32(mb->un.varRdLnk.crcCnt);
        /* Xmit ELS RPS ACC response tag <ulpIoTag> */
        lpfc_printf_vlog(ndlp->vport, KERN_INFO, LOG_ELS,
                         "0118 Xmit ELS RPS ACC response tag x%x xri x%x, "
                         "did x%x, nlp_flag x%x, nlp_state x%x, rpi x%x\n",
                         elsiocb->iotag, elsiocb->iocb.ulpContext,
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);
        elsiocb->iocb_cmpl = lpfc_cmpl_els_rsp;
        phba->fc_stat.elsXmitACC++;
        if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR)
                lpfc_els_free_iocb(phba, elsiocb);
        return;
}

/**
 * lpfc_els_rcv_rps: Process an unsolicited rps iocb.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes Read Port Status (RPS) IOCB received as an
 * ELS unsolicited event. It first checks the remote port state. If the
 * remote port is not in NLP_STE_UNMAPPED_NODE state or NLP_STE_MAPPED_NODE
 * state, it invokes the lpfc_els_rsp_reject() routine to send the reject
 * response. Otherwise, it issue the MBX_READ_LNK_STAT mailbox command
 * for reading the HBA link statistics. It is for the callback function,
 * lpfc_els_rsp_rps_acc(), set to the MBX_READ_LNK_STAT mailbox command
 * to actually sending out RPS Accept (ACC) response.
 *
 * Return codes
 *   0 - Successfully processed rps iocb (currently always return 0)
 **/
static int
lpfc_els_rcv_rps(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                 struct lpfc_nodelist *ndlp)
{
        struct lpfc_hba *phba = vport->phba;
        uint32_t *lp;
        uint8_t flag;
        LPFC_MBOXQ_t *mbox;
        struct lpfc_dmabuf *pcmd;
        RPS *rps;
        struct ls_rjt stat;

        if ((ndlp->nlp_state != NLP_STE_UNMAPPED_NODE) &&
            (ndlp->nlp_state != NLP_STE_MAPPED_NODE))
                /* reject the unsolicited RPS request and done with it */
                goto reject_out;

        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;
        flag = (be32_to_cpu(*lp++) & 0xf);
        rps = (RPS *) lp;

        if ((flag == 0) ||
            ((flag == 1) && (be32_to_cpu(rps->un.portNum) == 0)) ||
            ((flag == 2) && (memcmp(&rps->un.portName, &vport->fc_portname,
                                    sizeof(struct lpfc_name)) == 0))) {

                printk("Fix me....\n");
                dump_stack();
                mbox = mempool_alloc(phba->mbox_mem_pool, GFP_ATOMIC);
                if (mbox) {
                        lpfc_read_lnk_stat(phba, mbox);
                        mbox->context1 =
                            (void *)((unsigned long) cmdiocb->iocb.ulpContext);
                        mbox->context2 = lpfc_nlp_get(ndlp);
                        mbox->vport = vport;
                        mbox->mbox_cmpl = lpfc_els_rsp_rps_acc;
                        if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT)
                                != MBX_NOT_FINISHED)
                                /* Mbox completion will send ELS Response */
                                return 0;
                        /* Decrement reference count used for the failed mbox
                         * command.
                         */
                        lpfc_nlp_put(ndlp);
                        mempool_free(mbox, phba->mbox_mem_pool);
                }
        }

reject_out:
        /* issue rejection response */
        stat.un.b.lsRjtRsvd0 = 0;
        stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
        stat.un.b.lsRjtRsnCodeExp = LSEXP_CANT_GIVE_DATA;
        stat.un.b.vendorUnique = 0;
        lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp, NULL);
        return 0;
}

/**
 * lpfc_els_rsp_rpl_acc: Issue an accept rpl els command.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdsize: size of the ELS command.
 * @oldiocb: pointer to the original lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine issuees an Accept (ACC) Read Port List (RPL) ELS command.
 * It is to be called by the lpfc_els_rcv_rpl() routine to accept the RPL.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the RPL Accept Response ELS command.
 *
 * Return code
 *   0 - Successfully issued ACC RPL ELS command
 *   1 - Failed to issue ACC RPL ELS command
 **/
static int
lpfc_els_rsp_rpl_acc(struct lpfc_vport *vport, uint16_t cmdsize,
                     struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp)
{
        struct lpfc_hba *phba = vport->phba;
        IOCB_t *icmd, *oldcmd;
        RPL_RSP rpl_rsp;
        struct lpfc_iocbq *elsiocb;
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring = &psli->ring[LPFC_ELS_RING];
        uint8_t *pcmd;

        elsiocb = lpfc_prep_els_iocb(vport, 0, cmdsize, oldiocb->retry, ndlp,
                                     ndlp->nlp_DID, ELS_CMD_ACC);

        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        oldcmd = &oldiocb->iocb;
        icmd->ulpContext = oldcmd->ulpContext;  /* Xri */

        pcmd = (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
        *((uint32_t *) (pcmd)) = ELS_CMD_ACC;
        pcmd += sizeof(uint16_t);
        *((uint16_t *)(pcmd)) = be16_to_cpu(cmdsize);
        pcmd += sizeof(uint16_t);

        /* Setup the RPL ACC payload */
        rpl_rsp.listLen = be32_to_cpu(1);
        rpl_rsp.index = 0;
        rpl_rsp.port_num_blk.portNum = 0;
        rpl_rsp.port_num_blk.portID = be32_to_cpu(vport->fc_myDID);
        memcpy(&rpl_rsp.port_num_blk.portName, &vport->fc_portname,
            sizeof(struct lpfc_name));
        memcpy(pcmd, &rpl_rsp, cmdsize - sizeof(uint32_t));
        /* Xmit ELS RPL ACC response tag <ulpIoTag> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0120 Xmit ELS RPL ACC response tag x%x "
                         "xri x%x, did x%x, nlp_flag x%x, nlp_state x%x, "
                         "rpi x%x\n",
                         elsiocb->iotag, elsiocb->iocb.ulpContext,
                         ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
                         ndlp->nlp_rpi);
        elsiocb->iocb_cmpl = lpfc_cmpl_els_rsp;
        phba->fc_stat.elsXmitACC++;
        if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_els_rcv_rpl: Process an unsolicited rpl iocb.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes Read Port List (RPL) IOCB received as an ELS
 * unsolicited event. It first checks the remote port state. If the remote
 * port is not in NLP_STE_UNMAPPED_NODE and NLP_STE_MAPPED_NODE states, it
 * invokes the lpfc_els_rsp_reject() routine to send reject response.
 * Otherwise, this routine then invokes the lpfc_els_rsp_rpl_acc() routine
 * to accept the RPL.
 *
 * Return code
 *   0 - Successfully processed rpl iocb (currently always return 0)
 **/
static int
lpfc_els_rcv_rpl(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                 struct lpfc_nodelist *ndlp)
{
        struct lpfc_dmabuf *pcmd;
        uint32_t *lp;
        uint32_t maxsize;
        uint16_t cmdsize;
        RPL *rpl;
        struct ls_rjt stat;

        if ((ndlp->nlp_state != NLP_STE_UNMAPPED_NODE) &&
            (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
                /* issue rejection response */
                stat.un.b.lsRjtRsvd0 = 0;
                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_CANT_GIVE_DATA;
                stat.un.b.vendorUnique = 0;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                        NULL);
                /* rejected the unsolicited RPL request and done with it */
                return 0;
        }

        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;
        rpl = (RPL *) (lp + 1);

        maxsize = be32_to_cpu(rpl->maxsize);

        /* We support only one port */
        if ((rpl->index == 0) &&
            ((maxsize == 0) ||
             ((maxsize * sizeof(uint32_t)) >= sizeof(RPL_RSP)))) {
                cmdsize = sizeof(uint32_t) + sizeof(RPL_RSP);
        } else {
                cmdsize = sizeof(uint32_t) + maxsize * sizeof(uint32_t);
        }
        lpfc_els_rsp_rpl_acc(vport, cmdsize, cmdiocb, ndlp);

        return 0;
}

/**
 * lpfc_els_rcv_farp: Process an unsolicited farp request els command.
 * @vport: pointer to a virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes Fibre Channel Address Resolution Protocol
 * (FARP) Request IOCB received as an ELS unsolicited event. Currently,
 * the lpfc driver only supports matching on WWPN or WWNN for FARP. As such,
 * FARP_MATCH_PORT flag and FARP_MATCH_NODE flag are checked against the
 * Match Flag in the FARP request IOCB: if FARP_MATCH_PORT flag is set, the
 * remote PortName is compared against the FC PortName stored in the @vport
 * data structure; if FARP_MATCH_NODE flag is set, the remote NodeName is
 * compared against the FC NodeName stored in the @vport data structure.
 * If any of these matches and the FARP_REQUEST_FARPR flag is set in the
 * FARP request IOCB Response Flag, the lpfc_issue_els_farpr() routine is
 * invoked to send out FARP Response to the remote node. Before sending the
 * FARP Response, however, the FARP_REQUEST_PLOGI flag is check in the FARP
 * request IOCB Response Flag and, if it is set, the lpfc_issue_els_plogi()
 * routine is invoked to log into the remote port first.
 *
 * Return code
 *   0 - Either the FARP Match Mode not supported or successfully processed
 **/
static int
lpfc_els_rcv_farp(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_nodelist *ndlp)
{
        struct lpfc_dmabuf *pcmd;
        uint32_t *lp;
        IOCB_t *icmd;
        FARP *fp;
        uint32_t cmd, cnt, did;

        icmd = &cmdiocb->iocb;
        did = icmd->un.elsreq64.remoteID;
        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;

        cmd = *lp++;
        fp = (FARP *) lp;
        /* FARP-REQ received from DID <did> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0601 FARP-REQ received from DID x%x\n", did);
        /* We will only support match on WWPN or WWNN */
        if (fp->Mflags & ~(FARP_MATCH_NODE | FARP_MATCH_PORT)) {
                return 0;
        }

        cnt = 0;
        /* If this FARP command is searching for my portname */
        if (fp->Mflags & FARP_MATCH_PORT) {
                if (memcmp(&fp->RportName, &vport->fc_portname,
                           sizeof(struct lpfc_name)) == 0)
                        cnt = 1;
        }

        /* If this FARP command is searching for my nodename */
        if (fp->Mflags & FARP_MATCH_NODE) {
                if (memcmp(&fp->RnodeName, &vport->fc_nodename,
                           sizeof(struct lpfc_name)) == 0)
                        cnt = 1;
        }

        if (cnt) {
                if ((ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) ||
                   (ndlp->nlp_state == NLP_STE_MAPPED_NODE)) {
                        /* Log back into the node before sending the FARP. */
                        if (fp->Rflags & FARP_REQUEST_PLOGI) {
                                ndlp->nlp_prev_state = ndlp->nlp_state;
                                lpfc_nlp_set_state(vport, ndlp,
                                                   NLP_STE_PLOGI_ISSUE);
                                lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0);
                        }

                        /* Send a FARP response to that node */
                        if (fp->Rflags & FARP_REQUEST_FARPR)
                                lpfc_issue_els_farpr(vport, did, 0);
                }
        }
        return 0;
}

/**
 * lpfc_els_rcv_farpr: Process an unsolicited farp response iocb.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine processes Fibre Channel Address Resolution Protocol
 * Response (FARPR) IOCB received as an ELS unsolicited event. It simply
 * invokes the lpfc_els_rsp_acc() routine to the remote node to accept
 * the FARP response request.
 *
 * Return code
 *   0 - Successfully processed FARPR IOCB (currently always return 0)
 **/
static int
lpfc_els_rcv_farpr(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_nodelist  *ndlp)
{
        struct lpfc_dmabuf *pcmd;
        uint32_t *lp;
        IOCB_t *icmd;
        uint32_t cmd, did;

        icmd = &cmdiocb->iocb;
        did = icmd->un.elsreq64.remoteID;
        pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
        lp = (uint32_t *) pcmd->virt;

        cmd = *lp++;
        /* FARP-RSP received from DID <did> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0600 FARP-RSP received from DID x%x\n", did);
        /* ACCEPT the Farp resp request */
        lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);

        return 0;
}

/**
 * lpfc_els_rcv_fan: Process an unsolicited fan iocb command.
 * @vport: pointer to a host virtual N_Port data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @fan_ndlp: pointer to a node-list data structure.
 *
 * This routine processes a Fabric Address Notification (FAN) IOCB
 * command received as an ELS unsolicited event. The FAN ELS command will
 * only be processed on a physical port (i.e., the @vport represents the
 * physical port). The fabric NodeName and PortName from the FAN IOCB are
 * compared against those in the phba data structure. If any of those is
 * different, the lpfc_initial_flogi() routine is invoked to initialize
 * Fabric Login (FLOGI) to the fabric to start the discover over. Otherwise,
 * if both of those are identical, the lpfc_issue_fabric_reglogin() routine
 * is invoked to register login to the fabric.
 *
 * Return code
 *   0 - Successfully processed fan iocb (currently always return 0).
 **/
static int
lpfc_els_rcv_fan(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                 struct lpfc_nodelist *fan_ndlp)
{
        struct lpfc_hba *phba = vport->phba;
        uint32_t *lp;
        FAN *fp;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS, "0265 FAN received\n");
        lp = (uint32_t *)((struct lpfc_dmabuf *)cmdiocb->context2)->virt;
        fp = (FAN *) ++lp;
        /* FAN received; Fan does not have a reply sequence */
        if ((vport == phba->pport) &&
            (vport->port_state == LPFC_LOCAL_CFG_LINK)) {
                if ((memcmp(&phba->fc_fabparam.nodeName, &fp->FnodeName,
                            sizeof(struct lpfc_name))) ||
                    (memcmp(&phba->fc_fabparam.portName, &fp->FportName,
                            sizeof(struct lpfc_name)))) {
                        /* This port has switched fabrics. FLOGI is required */
                        lpfc_initial_flogi(vport);
                } else {
                        /* FAN verified - skip FLOGI */
                        vport->fc_myDID = vport->fc_prevDID;
                        lpfc_issue_fabric_reglogin(vport);
                }
        }
        return 0;
}

/**
 * lpfc_els_timeout: Handler funciton to the els timer.
 * @ptr: holder for the timer function associated data.
 *
 * This routine is invoked by the ELS timer after timeout. It posts the ELS
 * timer timeout event by setting the WORKER_ELS_TMO bit to the work port
 * event bitmap and then invokes the lpfc_worker_wake_up() routine to wake
 * up the worker thread. It is for the worker thread to invoke the routine
 * lpfc_els_timeout_handler() to work on the posted event WORKER_ELS_TMO.
 **/
void
lpfc_els_timeout(unsigned long ptr)
{
        struct lpfc_vport *vport = (struct lpfc_vport *) ptr;
        struct lpfc_hba   *phba = vport->phba;
        uint32_t tmo_posted;
        unsigned long iflag;

        spin_lock_irqsave(&vport->work_port_lock, iflag);
        tmo_posted = vport->work_port_events & WORKER_ELS_TMO;
        if (!tmo_posted)
                vport->work_port_events |= WORKER_ELS_TMO;
        spin_unlock_irqrestore(&vport->work_port_lock, iflag);

        if (!tmo_posted)
                lpfc_worker_wake_up(phba);
        return;
}

/**
 * lpfc_els_timeout_handler: Process an els timeout event.
 * @vport: pointer to a virtual N_Port data structure.
 *
 * This routine is the actual handler function that processes an ELS timeout
 * event. It walks the ELS ring to get and abort all the IOCBs (except the
 * ABORT/CLOSE/FARP/FARPR/FDISC), which are associated with the @vport by
 * invoking the lpfc_sli_issue_abort_iotag() routine.
 **/
void
lpfc_els_timeout_handler(struct lpfc_vport *vport)
{
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_sli_ring *pring;
        struct lpfc_iocbq *tmp_iocb, *piocb;
        IOCB_t *cmd = NULL;
        struct lpfc_dmabuf *pcmd;
        uint32_t els_command = 0;
        uint32_t timeout;
        uint32_t remote_ID = 0xffffffff;

        /* If the timer is already canceled do nothing */
        if ((vport->work_port_events & WORKER_ELS_TMO) == 0) {
                return;
        }
        spin_lock_irq(&phba->hbalock);
        timeout = (uint32_t)(phba->fc_ratov << 1);

        pring = &phba->sli.ring[LPFC_ELS_RING];

        list_for_each_entry_safe(piocb, tmp_iocb, &pring->txcmplq, list) {
                cmd = &piocb->iocb;

                if ((piocb->iocb_flag & LPFC_IO_LIBDFC) != 0 ||
                    piocb->iocb.ulpCommand == CMD_ABORT_XRI_CN ||
                    piocb->iocb.ulpCommand == CMD_CLOSE_XRI_CN)
                        continue;

                if (piocb->vport != vport)
                        continue;

                pcmd = (struct lpfc_dmabuf *) piocb->context2;
                if (pcmd)
                        els_command = *(uint32_t *) (pcmd->virt);

                if (els_command == ELS_CMD_FARP ||
                    els_command == ELS_CMD_FARPR ||
                    els_command == ELS_CMD_FDISC)
                        continue;

                if (piocb->drvrTimeout > 0) {
                        if (piocb->drvrTimeout >= timeout)
                                piocb->drvrTimeout -= timeout;
                        else
                                piocb->drvrTimeout = 0;
                        continue;
                }

                remote_ID = 0xffffffff;
                if (cmd->ulpCommand != CMD_GEN_REQUEST64_CR)
                        remote_ID = cmd->un.elsreq64.remoteID;
                else {
                        struct lpfc_nodelist *ndlp;
                        ndlp = __lpfc_findnode_rpi(vport, cmd->ulpContext);
                        if (ndlp && NLP_CHK_NODE_ACT(ndlp))
                                remote_ID = ndlp->nlp_DID;
                }
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0127 ELS timeout Data: x%x x%x x%x "
                                 "x%x\n", els_command,
                                 remote_ID, cmd->ulpCommand, cmd->ulpIoTag);
                lpfc_sli_issue_abort_iotag(phba, pring, piocb);
        }
        spin_unlock_irq(&phba->hbalock);

        if (phba->sli.ring[LPFC_ELS_RING].txcmplq_cnt)
                mod_timer(&vport->els_tmofunc, jiffies + HZ * timeout);
}

/**
 * lpfc_els_flush_cmd: Clean up the outstanding els commands to a vport.
 * @vport: pointer to a host virtual N_Port data structure.
 *
 * This routine is used to clean up all the outstanding ELS commands on a
 * @vport. It first aborts the @vport by invoking lpfc_fabric_abort_vport()
 * routine. After that, it walks the ELS transmit queue to remove all the
 * IOCBs with the @vport other than the QUE_RING and ABORT/CLOSE IOCBs. For
 * the IOCBs with a non-NULL completion callback function, the callback
 * function will be invoked with the status set to IOSTAT_LOCAL_REJECT and
 * un.ulpWord[4] set to IOERR_SLI_ABORTED. For IOCBs with a NULL completion
 * callback function, the IOCB will simply be released. Finally, it walks
 * the ELS transmit completion queue to issue an abort IOCB to any transmit
 * completion queue IOCB that is associated with the @vport and is not
 * an IOCB from libdfc (i.e., the management plane IOCBs that are not
 * part of the discovery state machine) out to HBA by invoking the
 * lpfc_sli_issue_abort_iotag() routine. Note that this function issues the
 * abort IOCB to any transmit completion queueed IOCB, it does not guarantee
 * the IOCBs are aborted when this function returns.
 **/
void
lpfc_els_flush_cmd(struct lpfc_vport *vport)
{
        LIST_HEAD(completions);
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];
        struct lpfc_iocbq *tmp_iocb, *piocb;
        IOCB_t *cmd = NULL;

        lpfc_fabric_abort_vport(vport);

        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(piocb, tmp_iocb, &pring->txq, list) {
                cmd = &piocb->iocb;

                if (piocb->iocb_flag & LPFC_IO_LIBDFC) {
                        continue;
                }

                /* Do not flush out the QUE_RING and ABORT/CLOSE iocbs */
                if (cmd->ulpCommand == CMD_QUE_RING_BUF_CN ||
                    cmd->ulpCommand == CMD_QUE_RING_BUF64_CN ||
                    cmd->ulpCommand == CMD_CLOSE_XRI_CN ||
                    cmd->ulpCommand == CMD_ABORT_XRI_CN)
                        continue;

                if (piocb->vport != vport)
                        continue;

                list_move_tail(&piocb->list, &completions);
                pring->txq_cnt--;
        }

        list_for_each_entry_safe(piocb, tmp_iocb, &pring->txcmplq, list) {
                if (piocb->iocb_flag & LPFC_IO_LIBDFC) {
                        continue;
                }

                if (piocb->vport != vport)
                        continue;

                lpfc_sli_issue_abort_iotag(phba, pring, piocb);
        }
        spin_unlock_irq(&phba->hbalock);

        while (!list_empty(&completions)) {
                piocb = list_get_first(&completions, struct lpfc_iocbq, list);
                cmd = &piocb->iocb;
                list_del_init(&piocb->list);

                if (!piocb->iocb_cmpl)
                        lpfc_sli_release_iocbq(phba, piocb);
                else {
                        cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
                        cmd->un.ulpWord[4] = IOERR_SLI_ABORTED;
                        (piocb->iocb_cmpl) (phba, piocb, piocb);
                }
        }

        return;
}

/**
 * lpfc_els_flush_all_cmd: Clean up all the outstanding els commands to a HBA.
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine is used to clean up all the outstanding ELS commands on a
 * @phba. It first aborts the @phba by invoking the lpfc_fabric_abort_hba()
 * routine. After that, it walks the ELS transmit queue to remove all the
 * IOCBs to the @phba other than the QUE_RING and ABORT/CLOSE IOCBs. For
 * the IOCBs with the completion callback function associated, the callback
 * function will be invoked with the status set to IOSTAT_LOCAL_REJECT and
 * un.ulpWord[4] set to IOERR_SLI_ABORTED. For IOCBs without the completion
 * callback function associated, the IOCB will simply be released. Finally,
 * it walks the ELS transmit completion queue to issue an abort IOCB to any
 * transmit completion queue IOCB that is not an IOCB from libdfc (i.e., the
 * management plane IOCBs that are not part of the discovery state machine)
 * out to HBA by invoking the lpfc_sli_issue_abort_iotag() routine.
 **/
void
lpfc_els_flush_all_cmd(struct lpfc_hba  *phba)
{
        LIST_HEAD(completions);
        struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];
        struct lpfc_iocbq *tmp_iocb, *piocb;
        IOCB_t *cmd = NULL;

        lpfc_fabric_abort_hba(phba);
        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(piocb, tmp_iocb, &pring->txq, list) {
                cmd = &piocb->iocb;
                if (piocb->iocb_flag & LPFC_IO_LIBDFC)
                        continue;
                /* Do not flush out the QUE_RING and ABORT/CLOSE iocbs */
                if (cmd->ulpCommand == CMD_QUE_RING_BUF_CN ||
                    cmd->ulpCommand == CMD_QUE_RING_BUF64_CN ||
                    cmd->ulpCommand == CMD_CLOSE_XRI_CN ||
                    cmd->ulpCommand == CMD_ABORT_XRI_CN)
                        continue;
                list_move_tail(&piocb->list, &completions);
                pring->txq_cnt--;
        }
        list_for_each_entry_safe(piocb, tmp_iocb, &pring->txcmplq, list) {
                if (piocb->iocb_flag & LPFC_IO_LIBDFC)
                        continue;
                lpfc_sli_issue_abort_iotag(phba, pring, piocb);
        }
        spin_unlock_irq(&phba->hbalock);
        while (!list_empty(&completions)) {
                piocb = list_get_first(&completions, struct lpfc_iocbq, list);
                cmd = &piocb->iocb;
                list_del_init(&piocb->list);
                if (!piocb->iocb_cmpl)
                        lpfc_sli_release_iocbq(phba, piocb);
                else {
                        cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
                        cmd->un.ulpWord[4] = IOERR_SLI_ABORTED;
                        (piocb->iocb_cmpl) (phba, piocb, piocb);
                }
        }
        return;
}

/**
 * lpfc_send_els_failure_event: Posts an ELS command failure event.
 * @phba: Pointer to hba context object.
 * @cmdiocbp: Pointer to command iocb which reported error.
 * @rspiocbp: Pointer to response iocb which reported error.
 *
 * This function sends an event when there is an ELS command
 * failure.
 **/
void
lpfc_send_els_failure_event(struct lpfc_hba *phba,
                        struct lpfc_iocbq *cmdiocbp,
                        struct lpfc_iocbq *rspiocbp)
{
        struct lpfc_vport *vport = cmdiocbp->vport;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_lsrjt_event lsrjt_event;
        struct lpfc_fabric_event_header fabric_event;
        struct ls_rjt stat;
        struct lpfc_nodelist *ndlp;
        uint32_t *pcmd;

        ndlp = cmdiocbp->context1;
        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp))
                return;

        if (rspiocbp->iocb.ulpStatus == IOSTAT_LS_RJT) {
                lsrjt_event.header.event_type = FC_REG_ELS_EVENT;
                lsrjt_event.header.subcategory = LPFC_EVENT_LSRJT_RCV;
                memcpy(lsrjt_event.header.wwpn, &ndlp->nlp_portname,
                        sizeof(struct lpfc_name));
                memcpy(lsrjt_event.header.wwnn, &ndlp->nlp_nodename,
                        sizeof(struct lpfc_name));
                pcmd = (uint32_t *) (((struct lpfc_dmabuf *)
                        cmdiocbp->context2)->virt);
                lsrjt_event.command = *pcmd;
                stat.un.lsRjtError = be32_to_cpu(rspiocbp->iocb.un.ulpWord[4]);
                lsrjt_event.reason_code = stat.un.b.lsRjtRsnCode;
                lsrjt_event.explanation = stat.un.b.lsRjtRsnCodeExp;
                fc_host_post_vendor_event(shost,
                        fc_get_event_number(),
                        sizeof(lsrjt_event),
                        (char *)&lsrjt_event,
                        SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
                return;
        }
        if ((rspiocbp->iocb.ulpStatus == IOSTAT_NPORT_BSY) ||
                (rspiocbp->iocb.ulpStatus == IOSTAT_FABRIC_BSY)) {
                fabric_event.event_type = FC_REG_FABRIC_EVENT;
                if (rspiocbp->iocb.ulpStatus == IOSTAT_NPORT_BSY)
                        fabric_event.subcategory = LPFC_EVENT_PORT_BUSY;
                else
                        fabric_event.subcategory = LPFC_EVENT_FABRIC_BUSY;
                memcpy(fabric_event.wwpn, &ndlp->nlp_portname,
                        sizeof(struct lpfc_name));
                memcpy(fabric_event.wwnn, &ndlp->nlp_nodename,
                        sizeof(struct lpfc_name));
                fc_host_post_vendor_event(shost,
                        fc_get_event_number(),
                        sizeof(fabric_event),
                        (char *)&fabric_event,
                        SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
                return;
        }

}

/**
 * lpfc_send_els_event: Posts unsolicited els event.
 * @vport: Pointer to vport object.
 * @ndlp: Pointer FC node object.
 * @cmd: ELS command code.
 *
 * This function posts an event when there is an incoming
 * unsolicited ELS command.
 **/
static void
lpfc_send_els_event(struct lpfc_vport *vport,
                    struct lpfc_nodelist *ndlp,
                    uint32_t cmd)
{
        struct lpfc_els_event_header els_data;
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);

        els_data.event_type = FC_REG_ELS_EVENT;
        switch (cmd) {
        case ELS_CMD_PLOGI:
                els_data.subcategory = LPFC_EVENT_PLOGI_RCV;
                break;
        case ELS_CMD_PRLO:
                els_data.subcategory = LPFC_EVENT_PRLO_RCV;
                break;
        case ELS_CMD_ADISC:
                els_data.subcategory = LPFC_EVENT_ADISC_RCV;
                break;
        default:
                return;
        }
        memcpy(els_data.wwpn, &ndlp->nlp_portname, sizeof(struct lpfc_name));
        memcpy(els_data.wwnn, &ndlp->nlp_nodename, sizeof(struct lpfc_name));
        fc_host_post_vendor_event(shost,
                fc_get_event_number(),
                sizeof(els_data),
                (char *)&els_data,
                SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);

        return;
}


/**
 * lpfc_els_unsol_buffer: Process an unsolicited event data buffer.
 * @phba: pointer to lpfc hba data structure.
 * @pring: pointer to a SLI ring.
 * @vport: pointer to a host virtual N_Port data structure.
 * @elsiocb: pointer to lpfc els command iocb data structure.
 *
 * This routine is used for processing the IOCB associated with a unsolicited
 * event. It first determines whether there is an existing ndlp that matches
 * the DID from the unsolicited IOCB. If not, it will create a new one with
 * the DID from the unsolicited IOCB. The ELS command from the unsolicited
 * IOCB is then used to invoke the proper routine and to set up proper state
 * of the discovery state machine.
 **/
static void
lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                      struct lpfc_vport *vport, struct lpfc_iocbq *elsiocb)
{
        struct Scsi_Host  *shost;
        struct lpfc_nodelist *ndlp;
        struct ls_rjt stat;
        uint32_t *payload;
        uint32_t cmd, did, newnode, rjt_err = 0;
        IOCB_t *icmd = &elsiocb->iocb;

        if (!vport || !(elsiocb->context2))
                goto dropit;

        newnode = 0;
        payload = ((struct lpfc_dmabuf *)elsiocb->context2)->virt;
        cmd = *payload;
        if ((phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) == 0)
                lpfc_post_buffer(phba, pring, 1);

        did = icmd->un.rcvels.remoteID;
        if (icmd->ulpStatus) {
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV Unsol ELS:  status:x%x/x%x did:x%x",
                        icmd->ulpStatus, icmd->un.ulpWord[4], did);
                goto dropit;
        }

        /* Check to see if link went down during discovery */
        if (lpfc_els_chk_latt(vport))
                goto dropit;

        /* Ignore traffic recevied during vport shutdown. */
        if (vport->load_flag & FC_UNLOADING)
                goto dropit;

        ndlp = lpfc_findnode_did(vport, did);
        if (!ndlp) {
                /* Cannot find existing Fabric ndlp, so allocate a new one */
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp)
                        goto dropit;

                lpfc_nlp_init(vport, ndlp, did);
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                newnode = 1;
                if ((did & Fabric_DID_MASK) == Fabric_DID_MASK)
                        ndlp->nlp_type |= NLP_FABRIC;
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                ndlp = lpfc_enable_node(vport, ndlp,
                                        NLP_STE_UNUSED_NODE);
                if (!ndlp)
                        goto dropit;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                newnode = 1;
                if ((did & Fabric_DID_MASK) == Fabric_DID_MASK)
                        ndlp->nlp_type |= NLP_FABRIC;
        } else if (ndlp->nlp_state == NLP_STE_UNUSED_NODE) {
                /* This is similar to the new node path */
                ndlp = lpfc_nlp_get(ndlp);
                if (!ndlp)
                        goto dropit;
                lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
                newnode = 1;
        }

        phba->fc_stat.elsRcvFrame++;

        elsiocb->context1 = lpfc_nlp_get(ndlp);
        elsiocb->vport = vport;

        if ((cmd & ELS_CMD_MASK) == ELS_CMD_RSCN) {
                cmd &= ELS_CMD_MASK;
        }
        /* ELS command <elsCmd> received from NPORT <did> */
        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0112 ELS command x%x received from NPORT x%x "
                         "Data: x%x\n", cmd, did, vport->port_state);
        switch (cmd) {
        case ELS_CMD_PLOGI:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV PLOGI:       did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvPLOGI++;
                ndlp = lpfc_plogi_confirm_nport(phba, payload, ndlp);

                lpfc_send_els_event(vport, ndlp, cmd);
                if (vport->port_state < LPFC_DISC_AUTH) {
                        if (!(phba->pport->fc_flag & FC_PT2PT) ||
                                (phba->pport->fc_flag & FC_PT2PT_PLOGI)) {
                                rjt_err = LSRJT_UNABLE_TPC;
                                break;
                        }
                        /* We get here, and drop thru, if we are PT2PT with
                         * another NPort and the other side has initiated
                         * the PLOGI before responding to our FLOGI.
                         */
                }

                shost = lpfc_shost_from_vport(vport);
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_TARGET_REMOVE;
                spin_unlock_irq(shost->host_lock);

                lpfc_disc_state_machine(vport, ndlp, elsiocb,
                                        NLP_EVT_RCV_PLOGI);

                break;
        case ELS_CMD_FLOGI:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV FLOGI:       did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvFLOGI++;
                lpfc_els_rcv_flogi(vport, elsiocb, ndlp);
                if (newnode)
                        lpfc_nlp_put(ndlp);
                break;
        case ELS_CMD_LOGO:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV LOGO:        did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvLOGO++;
                if (vport->port_state < LPFC_DISC_AUTH) {
                        rjt_err = LSRJT_UNABLE_TPC;
                        break;
                }
                lpfc_disc_state_machine(vport, ndlp, elsiocb, NLP_EVT_RCV_LOGO);
                break;
        case ELS_CMD_PRLO:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV PRLO:        did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvPRLO++;
                lpfc_send_els_event(vport, ndlp, cmd);
                if (vport->port_state < LPFC_DISC_AUTH) {
                        rjt_err = LSRJT_UNABLE_TPC;
                        break;
                }
                lpfc_disc_state_machine(vport, ndlp, elsiocb, NLP_EVT_RCV_PRLO);
                break;
        case ELS_CMD_RSCN:
                phba->fc_stat.elsRcvRSCN++;
                lpfc_els_rcv_rscn(vport, elsiocb, ndlp);
                if (newnode)
                        lpfc_nlp_put(ndlp);
                break;
        case ELS_CMD_ADISC:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV ADISC:       did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                lpfc_send_els_event(vport, ndlp, cmd);
                phba->fc_stat.elsRcvADISC++;
                if (vport->port_state < LPFC_DISC_AUTH) {
                        rjt_err = LSRJT_UNABLE_TPC;
                        break;
                }
                lpfc_disc_state_machine(vport, ndlp, elsiocb,
                                        NLP_EVT_RCV_ADISC);
                break;
        case ELS_CMD_PDISC:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV PDISC:       did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvPDISC++;
                if (vport->port_state < LPFC_DISC_AUTH) {
                        rjt_err = LSRJT_UNABLE_TPC;
                        break;
                }
                lpfc_disc_state_machine(vport, ndlp, elsiocb,
                                        NLP_EVT_RCV_PDISC);
                break;
        case ELS_CMD_FARPR:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV FARPR:       did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvFARPR++;
                lpfc_els_rcv_farpr(vport, elsiocb, ndlp);
                break;
        case ELS_CMD_FARP:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV FARP:        did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvFARP++;
                lpfc_els_rcv_farp(vport, elsiocb, ndlp);
                break;
        case ELS_CMD_FAN:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV FAN:         did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvFAN++;
                lpfc_els_rcv_fan(vport, elsiocb, ndlp);
                break;
        case ELS_CMD_PRLI:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV PRLI:        did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvPRLI++;
                if (vport->port_state < LPFC_DISC_AUTH) {
                        rjt_err = LSRJT_UNABLE_TPC;
                        break;
                }
                lpfc_disc_state_machine(vport, ndlp, elsiocb, NLP_EVT_RCV_PRLI);
                break;
        case ELS_CMD_LIRR:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV LIRR:        did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvLIRR++;
                lpfc_els_rcv_lirr(vport, elsiocb, ndlp);
                if (newnode)
                        lpfc_nlp_put(ndlp);
                break;
        case ELS_CMD_RPS:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV RPS:         did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvRPS++;
                lpfc_els_rcv_rps(vport, elsiocb, ndlp);
                if (newnode)
                        lpfc_nlp_put(ndlp);
                break;
        case ELS_CMD_RPL:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV RPL:         did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvRPL++;
                lpfc_els_rcv_rpl(vport, elsiocb, ndlp);
                if (newnode)
                        lpfc_nlp_put(ndlp);
                break;
        case ELS_CMD_RNID:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV RNID:        did:x%x/ste:x%x flg:x%x",
                        did, vport->port_state, ndlp->nlp_flag);

                phba->fc_stat.elsRcvRNID++;
                lpfc_els_rcv_rnid(vport, elsiocb, ndlp);
                if (newnode)
                        lpfc_nlp_put(ndlp);
                break;
        default:
                lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_UNSOL,
                        "RCV ELS cmd:     cmd:x%x did:x%x/ste:x%x",
                        cmd, did, vport->port_state);

                /* Unsupported ELS command, reject */
                rjt_err = LSRJT_INVALID_CMD;

                /* Unknown ELS command <elsCmd> received from NPORT <did> */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0115 Unknown ELS command x%x "
                                 "received from NPORT x%x\n", cmd, did);
                if (newnode)
                        lpfc_nlp_put(ndlp);
                break;
        }

        /* check if need to LS_RJT received ELS cmd */
        if (rjt_err) {
                memset(&stat, 0, sizeof(stat));
                stat.un.b.lsRjtRsnCode = rjt_err;
                stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, elsiocb, ndlp,
                        NULL);
        }

        lpfc_nlp_put(elsiocb->context1);
        elsiocb->context1 = NULL;
        return;

dropit:
        if (vport && !(vport->load_flag & FC_UNLOADING))
                lpfc_printf_log(phba, KERN_ERR, LOG_ELS,
                        "(%d):0111 Dropping received ELS cmd "
                        "Data: x%x x%x x%x\n",
                        vport->vpi, icmd->ulpStatus,
                        icmd->un.ulpWord[4], icmd->ulpTimeout);
        phba->fc_stat.elsRcvDrop++;
}

/**
 * lpfc_find_vport_by_vpid: Find a vport on a HBA through vport identifier.
 * @phba: pointer to lpfc hba data structure.
 * @vpi: host virtual N_Port identifier.
 *
 * This routine finds a vport on a HBA (referred by @phba) through a
 * @vpi. The function walks the HBA's vport list and returns the address
 * of the vport with the matching @vpi.
 *
 * Return code
 *    NULL - No vport with the matching @vpi found
 *    Otherwise - Address to the vport with the matching @vpi.
 **/
static struct lpfc_vport *
lpfc_find_vport_by_vpid(struct lpfc_hba *phba, uint16_t vpi)
{
        struct lpfc_vport *vport;
        unsigned long flags;

        spin_lock_irqsave(&phba->hbalock, flags);
        list_for_each_entry(vport, &phba->port_list, listentry) {
                if (vport->vpi == vpi) {
                        spin_unlock_irqrestore(&phba->hbalock, flags);
                        return vport;
                }
        }
        spin_unlock_irqrestore(&phba->hbalock, flags);
        return NULL;
}

/**
 * lpfc_els_unsol_event: Process an unsolicited event from an els sli ring.
 * @phba: pointer to lpfc hba data structure.
 * @pring: pointer to a SLI ring.
 * @elsiocb: pointer to lpfc els iocb data structure.
 *
 * This routine is used to process an unsolicited event received from a SLI
 * (Service Level Interface) ring. The actual processing of the data buffer
 * associated with the unsolicited event is done by invoking the routine
 * lpfc_els_unsol_buffer() after properly set up the iocb buffer from the
 * SLI ring on which the unsolicited event was received.
 **/
void
lpfc_els_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                     struct lpfc_iocbq *elsiocb)
{
        struct lpfc_vport *vport = phba->pport;
        IOCB_t *icmd = &elsiocb->iocb;
        dma_addr_t paddr;
        struct lpfc_dmabuf *bdeBuf1 = elsiocb->context2;
        struct lpfc_dmabuf *bdeBuf2 = elsiocb->context3;

        elsiocb->context1 = NULL;
        elsiocb->context2 = NULL;
        elsiocb->context3 = NULL;

        if (icmd->ulpStatus == IOSTAT_NEED_BUFFER) {
                lpfc_sli_hbqbuf_add_hbqs(phba, LPFC_ELS_HBQ);
        } else if (icmd->ulpStatus == IOSTAT_LOCAL_REJECT &&
            (icmd->un.ulpWord[4] & 0xff) == IOERR_RCV_BUFFER_WAITING) {
                phba->fc_stat.NoRcvBuf++;
                /* Not enough posted buffers; Try posting more buffers */
                if (!(phba->sli3_options & LPFC_SLI3_HBQ_ENABLED))
                        lpfc_post_buffer(phba, pring, 0);
                return;
        }

        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
            (icmd->ulpCommand == CMD_IOCB_RCV_ELS64_CX ||
             icmd->ulpCommand == CMD_IOCB_RCV_SEQ64_CX)) {
                if (icmd->unsli3.rcvsli3.vpi == 0xffff)
                        vport = phba->pport;
                else {
                        uint16_t vpi = icmd->unsli3.rcvsli3.vpi;
                        vport = lpfc_find_vport_by_vpid(phba, vpi);
                }
        }
        /* If there are no BDEs associated
         * with this IOCB, there is nothing to do.
         */
        if (icmd->ulpBdeCount == 0)
                return;

        /* type of ELS cmd is first 32bit word
         * in packet
         */
        if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                elsiocb->context2 = bdeBuf1;
        } else {
                paddr = getPaddr(icmd->un.cont64[0].addrHigh,
                                 icmd->un.cont64[0].addrLow);
                elsiocb->context2 = lpfc_sli_ringpostbuf_get(phba, pring,
                                                             paddr);
        }

        lpfc_els_unsol_buffer(phba, pring, vport, elsiocb);
        /*
         * The different unsolicited event handlers would tell us
         * if they are done with "mp" by setting context2 to NULL.
         */
        if (elsiocb->context2) {
                lpfc_in_buf_free(phba, (struct lpfc_dmabuf *)elsiocb->context2);
                elsiocb->context2 = NULL;
        }

        /* RCV_ELS64_CX provide for 2 BDEs - process 2nd if included */
        if ((phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) &&
            icmd->ulpBdeCount == 2) {
                elsiocb->context2 = bdeBuf2;
                lpfc_els_unsol_buffer(phba, pring, vport, elsiocb);
                /* free mp if we are done with it */
                if (elsiocb->context2) {
                        lpfc_in_buf_free(phba, elsiocb->context2);
                        elsiocb->context2 = NULL;
                }
        }
}

/**
 * lpfc_do_scr_ns_plogi: Issue a plogi to the name server for scr.
 * @phba: pointer to lpfc hba data structure.
 * @vport: pointer to a virtual N_Port data structure.
 *
 * This routine issues a Port Login (PLOGI) to the Name Server with
 * State Change Request (SCR) for a @vport. This routine will create an
 * ndlp for the Name Server associated to the @vport if such node does
 * not already exist. The PLOGI to Name Server is issued by invoking the
 * lpfc_issue_els_plogi() routine. If Fabric-Device Management Interface
 * (FDMI) is configured to the @vport, a FDMI node will be created and
 * the PLOGI to FDMI is issued by invoking lpfc_issue_els_plogi() routine.
 **/
void
lpfc_do_scr_ns_plogi(struct lpfc_hba *phba, struct lpfc_vport *vport)
{
        struct lpfc_nodelist *ndlp, *ndlp_fdmi;

        ndlp = lpfc_findnode_did(vport, NameServer_DID);
        if (!ndlp) {
                ndlp = mempool_alloc(phba->nlp_mem_pool, GFP_KERNEL);
                if (!ndlp) {
                        if (phba->fc_topology == TOPOLOGY_LOOP) {
                                lpfc_disc_start(vport);
                                return;
                        }
                        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                         "0251 NameServer login: no memory\n");
                        return;
                }
                lpfc_nlp_init(vport, ndlp, NameServer_DID);
        } else if (!NLP_CHK_NODE_ACT(ndlp)) {
                ndlp = lpfc_enable_node(vport, ndlp, NLP_STE_UNUSED_NODE);
                if (!ndlp) {
                        if (phba->fc_topology == TOPOLOGY_LOOP) {
                                lpfc_disc_start(vport);
                                return;
                        }
                        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                        lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                        "0348 NameServer login: node freed\n");
                        return;
                }
        }
        ndlp->nlp_type |= NLP_FABRIC;

        lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);

        if (lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0)) {
                lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0252 Cannot issue NameServer login\n");
                return;
        }

        if (vport->cfg_fdmi_on) {
                ndlp_fdmi = mempool_alloc(phba->nlp_mem_pool,
                                          GFP_KERNEL);
                if (ndlp_fdmi) {
                        lpfc_nlp_init(vport, ndlp_fdmi, FDMI_DID);
                        ndlp_fdmi->nlp_type |= NLP_FABRIC;
                        lpfc_nlp_set_state(vport, ndlp_fdmi,
                                NLP_STE_PLOGI_ISSUE);
                        lpfc_issue_els_plogi(vport, ndlp_fdmi->nlp_DID,
                                             0);
                }
        }
        return;
}

/**
 * lpfc_cmpl_reg_new_vport: Completion callback function to register new vport.
 * @phba: pointer to lpfc hba data structure.
 * @pmb: pointer to the driver internal queue element for mailbox command.
 *
 * This routine is the completion callback function to register new vport
 * mailbox command. If the new vport mailbox command completes successfully,
 * the fabric registration login shall be performed on physical port (the
 * new vport created is actually a physical port, with VPI 0) or the port
 * login to Name Server for State Change Request (SCR) will be performed
 * on virtual port (real virtual port, with VPI greater than 0).
 **/
static void
lpfc_cmpl_reg_new_vport(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
{
        struct lpfc_vport *vport = pmb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) pmb->context2;
        MAILBOX_t *mb = &pmb->mb;

        spin_lock_irq(shost->host_lock);
        vport->fc_flag &= ~FC_VPORT_NEEDS_REG_VPI;
        spin_unlock_irq(shost->host_lock);

        if (mb->mbxStatus) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_MBOX,
                                 "0915 Register VPI failed: 0x%x\n",
                                 mb->mbxStatus);

                switch (mb->mbxStatus) {
                case 0x11:      /* unsupported feature */
                case 0x9603:    /* max_vpi exceeded */
                case 0x9602:    /* Link event since CLEAR_LA */
                        /* giving up on vport registration */
                        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
                        spin_unlock_irq(shost->host_lock);
                        lpfc_can_disctmo(vport);
                        break;
                default:
                        /* Try to recover from this error */
                        lpfc_mbx_unreg_vpi(vport);
                        spin_lock_irq(shost->host_lock);
                        vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
                        spin_unlock_irq(shost->host_lock);
                        if (vport->port_type == LPFC_PHYSICAL_PORT)
                                lpfc_initial_flogi(vport);
                        else
                                lpfc_initial_fdisc(vport);
                        break;
                }

        } else {
                if (vport == phba->pport)
                        lpfc_issue_fabric_reglogin(vport);
                else
                        lpfc_do_scr_ns_plogi(phba, vport);
        }

        /* Now, we decrement the ndlp reference count held for this
         * callback function
         */
        lpfc_nlp_put(ndlp);

        mempool_free(pmb, phba->mbox_mem_pool);
        return;
}

/**
 * lpfc_register_new_vport: Register a new vport with a HBA.
 * @phba: pointer to lpfc hba data structure.
 * @vport: pointer to a host virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine registers the @vport as a new virtual port with a HBA.
 * It is done through a registering vpi mailbox command.
 **/
static void
lpfc_register_new_vport(struct lpfc_hba *phba, struct lpfc_vport *vport,
                        struct lpfc_nodelist *ndlp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        LPFC_MBOXQ_t *mbox;

        mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (mbox) {
                lpfc_reg_vpi(phba, vport->vpi, vport->fc_myDID, mbox);
                mbox->vport = vport;
                mbox->context2 = lpfc_nlp_get(ndlp);
                mbox->mbox_cmpl = lpfc_cmpl_reg_new_vport;
                if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT)
                    == MBX_NOT_FINISHED) {
                        /* mailbox command not success, decrement ndlp
                         * reference count for this command
                         */
                        lpfc_nlp_put(ndlp);
                        mempool_free(mbox, phba->mbox_mem_pool);

                        lpfc_printf_vlog(vport, KERN_ERR, LOG_MBOX,
                                "0253 Register VPI: Can't send mbox\n");
                        goto mbox_err_exit;
                }
        } else {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_MBOX,
                                 "0254 Register VPI: no memory\n");
                goto mbox_err_exit;
        }
        return;

mbox_err_exit:
        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
        spin_lock_irq(shost->host_lock);
        vport->fc_flag &= ~FC_VPORT_NEEDS_REG_VPI;
        spin_unlock_irq(shost->host_lock);
        return;
}

/**
 * lpfc_cmpl_els_fdisc: Completion function for fdisc iocb command.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function to a Fabric Discover
 * (FDISC) ELS command. Since all the FDISC ELS commands are issued
 * single threaded, each FDISC completion callback function will reset
 * the discovery timer for all vports such that the timers will not get
 * unnecessary timeout. The function checks the FDISC IOCB status. If error
 * detected, the vport will be set to FC_VPORT_FAILED state. Otherwise,the
 * vport will set to FC_VPORT_ACTIVE state. It then checks whether the DID
 * assigned to the vport has been changed with the completion of the FDISC
 * command. If so, both RPI (Remote Port Index) and VPI (Virtual Port Index)
 * are unregistered from the HBA, and then the lpfc_register_new_vport()
 * routine is invoked to register new vport with the HBA. Otherwise, the
 * lpfc_do_scr_ns_plogi() routine is invoked to issue a PLOGI to the Name
 * Server for State Change Request (SCR).
 **/
static void
lpfc_cmpl_els_fdisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct Scsi_Host  *shost = lpfc_shost_from_vport(vport);
        struct lpfc_nodelist *ndlp = (struct lpfc_nodelist *) cmdiocb->context1;
        struct lpfc_nodelist *np;
        struct lpfc_nodelist *next_np;
        IOCB_t *irsp = &rspiocb->iocb;
        struct lpfc_iocbq *piocb;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
                         "0123 FDISC completes. x%x/x%x prevDID: x%x\n",
                         irsp->ulpStatus, irsp->un.ulpWord[4],
                         vport->fc_prevDID);
        /* Since all FDISCs are being single threaded, we
         * must reset the discovery timer for ALL vports
         * waiting to send FDISC when one completes.
         */
        list_for_each_entry(piocb, &phba->fabric_iocb_list, list) {
                lpfc_set_disctmo(piocb->vport);
        }

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "FDISC cmpl:      status:x%x/x%x prevdid:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4], vport->fc_prevDID);

        if (irsp->ulpStatus) {
                /* Check for retry */
                if (lpfc_els_retry(phba, cmdiocb, rspiocb))
                        goto out;
                /* FDISC failed */
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0126 FDISC failed. (%d/%d)\n",
                                 irsp->ulpStatus, irsp->un.ulpWord[4]);
                goto fdisc_failed;
        }
                if (vport->fc_vport->vport_state == FC_VPORT_INITIALIZING)
                        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                lpfc_nlp_put(ndlp);
                /* giving up on FDISC. Cancel discovery timer */
                lpfc_can_disctmo(vport);
        spin_lock_irq(shost->host_lock);
        vport->fc_flag |= FC_FABRIC;
        if (vport->phba->fc_topology == TOPOLOGY_LOOP)
                vport->fc_flag |=  FC_PUBLIC_LOOP;
        spin_unlock_irq(shost->host_lock);

        vport->fc_myDID = irsp->un.ulpWord[4] & Mask_DID;
        lpfc_vport_set_state(vport, FC_VPORT_ACTIVE);
        if ((vport->fc_prevDID != vport->fc_myDID) &&
                !(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) {
                /* If our NportID changed, we need to ensure all
                 * remaining NPORTs get unreg_login'ed so we can
                 * issue unreg_vpi.
                 */
                list_for_each_entry_safe(np, next_np,
                        &vport->fc_nodes, nlp_listp) {
                        if (!NLP_CHK_NODE_ACT(ndlp) ||
                            (np->nlp_state != NLP_STE_NPR_NODE) ||
                            !(np->nlp_flag & NLP_NPR_ADISC))
                                continue;
                        spin_lock_irq(shost->host_lock);
                        np->nlp_flag &= ~NLP_NPR_ADISC;
                        spin_unlock_irq(shost->host_lock);
                        lpfc_unreg_rpi(vport, np);
                }
                lpfc_mbx_unreg_vpi(vport);
                spin_lock_irq(shost->host_lock);
                vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
                spin_unlock_irq(shost->host_lock);
        }

        if (vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)
                lpfc_register_new_vport(phba, vport, ndlp);
        else
                lpfc_do_scr_ns_plogi(phba, vport);
        goto out;
fdisc_failed:
        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
        /* Cancel discovery timer */
        lpfc_can_disctmo(vport);
        lpfc_nlp_put(ndlp);
out:
        lpfc_els_free_iocb(phba, cmdiocb);
}

/**
 * lpfc_issue_els_fdisc: Issue a fdisc iocb command.
 * @vport: pointer to a virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 * @retry: number of retries to the command IOCB.
 *
 * This routine prepares and issues a Fabric Discover (FDISC) IOCB to
 * a remote node (@ndlp) off a @vport. It uses the lpfc_issue_fabric_iocb()
 * routine to issue the IOCB, which makes sure only one outstanding fabric
 * IOCB will be sent off HBA at any given time.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the FDISC ELS command.
 *
 * Return code
 *   0 - Successfully issued fdisc iocb command
 *   1 - Failed to issue fdisc iocb command
 **/
static int
lpfc_issue_els_fdisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     uint8_t retry)
{
        struct lpfc_hba *phba = vport->phba;
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        struct serv_parm *sp;
        uint8_t *pcmd;
        uint16_t cmdsize;
        int did = ndlp->nlp_DID;
        int rc;

        cmdsize = (sizeof(uint32_t) + sizeof(struct serv_parm));
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, retry, ndlp, did,
                                     ELS_CMD_FDISC);
        if (!elsiocb) {
                lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0255 Issue FDISC: no IOCB\n");
                return 1;
        }

        icmd = &elsiocb->iocb;
        icmd->un.elsreq64.myID = 0;
        icmd->un.elsreq64.fl = 1;

        /* For FDISC, Let FDISC rsp set the NPortID for this VPI */
        icmd->ulpCt_h = 1;
        icmd->ulpCt_l = 0;

        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
        *((uint32_t *) (pcmd)) = ELS_CMD_FDISC;
        pcmd += sizeof(uint32_t); /* CSP Word 1 */
        memcpy(pcmd, &vport->phba->pport->fc_sparam, sizeof(struct serv_parm));
        sp = (struct serv_parm *) pcmd;
        /* Setup CSPs accordingly for Fabric */
        sp->cmn.e_d_tov = 0;
        sp->cmn.w2.r_a_tov = 0;
        sp->cls1.classValid = 0;
        sp->cls2.seqDelivery = 1;
        sp->cls3.seqDelivery = 1;

        pcmd += sizeof(uint32_t); /* CSP Word 2 */
        pcmd += sizeof(uint32_t); /* CSP Word 3 */
        pcmd += sizeof(uint32_t); /* CSP Word 4 */
        pcmd += sizeof(uint32_t); /* Port Name */
        memcpy(pcmd, &vport->fc_portname, 8);
        pcmd += sizeof(uint32_t); /* Node Name */
        pcmd += sizeof(uint32_t); /* Node Name */
        memcpy(pcmd, &vport->fc_nodename, 8);

        lpfc_set_disctmo(vport);

        phba->fc_stat.elsXmitFDISC++;
        elsiocb->iocb_cmpl = lpfc_cmpl_els_fdisc;

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue FDISC:     did:x%x",
                did, 0, 0);

        rc = lpfc_issue_fabric_iocb(phba, elsiocb);
        if (rc == IOCB_ERROR) {
                lpfc_els_free_iocb(phba, elsiocb);
                lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
                                 "0256 Issue FDISC: Cannot send IOCB\n");
                return 1;
        }
        lpfc_vport_set_state(vport, FC_VPORT_INITIALIZING);
        vport->port_state = LPFC_FDISC;
        return 0;
}

/**
 * lpfc_cmpl_els_npiv_logo: Completion function with vport logo.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the completion callback function to the issuing of a LOGO
 * ELS command off a vport. It frees the command IOCB and then decrement the
 * reference count held on ndlp for this completion function, indicating that
 * the reference to the ndlp is no long needed. Note that the
 * lpfc_els_free_iocb() routine decrements the ndlp reference held for this
 * callback function and an additional explicit ndlp reference decrementation
 * will trigger the actual release of the ndlp.
 **/
static void
lpfc_cmpl_els_npiv_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                        struct lpfc_iocbq *rspiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        IOCB_t *irsp;
        struct lpfc_nodelist *ndlp;
        ndlp = (struct lpfc_nodelist *)cmdiocb->context1;

        irsp = &rspiocb->iocb;
        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "LOGO npiv cmpl:  status:x%x/x%x did:x%x",
                irsp->ulpStatus, irsp->un.ulpWord[4], irsp->un.rcvels.remoteID);

        lpfc_els_free_iocb(phba, cmdiocb);
        vport->unreg_vpi_cmpl = VPORT_ERROR;

        /* Trigger the release of the ndlp after logo */
        lpfc_nlp_put(ndlp);
}

/**
 * lpfc_issue_els_npiv_logo: Issue a logo off a vport.
 * @vport: pointer to a virtual N_Port data structure.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine issues a LOGO ELS command to an @ndlp off a @vport.
 *
 * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
 * will be incremented by 1 for holding the ndlp and the reference to ndlp
 * will be stored into the context1 field of the IOCB for the completion
 * callback function to the LOGO ELS command.
 *
 * Return codes
 *   0 - Successfully issued logo off the @vport
 *   1 - Failed to issue logo off the @vport
 **/
int
lpfc_issue_els_npiv_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
{
        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];
        IOCB_t *icmd;
        struct lpfc_iocbq *elsiocb;
        uint8_t *pcmd;
        uint16_t cmdsize;

        cmdsize = 2 * sizeof(uint32_t) + sizeof(struct lpfc_name);
        elsiocb = lpfc_prep_els_iocb(vport, 1, cmdsize, 0, ndlp, ndlp->nlp_DID,
                                     ELS_CMD_LOGO);
        if (!elsiocb)
                return 1;

        icmd = &elsiocb->iocb;
        pcmd = (uint8_t *) (((struct lpfc_dmabuf *) elsiocb->context2)->virt);
        *((uint32_t *) (pcmd)) = ELS_CMD_LOGO;
        pcmd += sizeof(uint32_t);

        /* Fill in LOGO payload */
        *((uint32_t *) (pcmd)) = be32_to_cpu(vport->fc_myDID);
        pcmd += sizeof(uint32_t);
        memcpy(pcmd, &vport->fc_portname, sizeof(struct lpfc_name));

        lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_ELS_CMD,
                "Issue LOGO npiv  did:x%x flg:x%x",
                ndlp->nlp_DID, ndlp->nlp_flag, 0);

        elsiocb->iocb_cmpl = lpfc_cmpl_els_npiv_logo;
        spin_lock_irq(shost->host_lock);
        ndlp->nlp_flag |= NLP_LOGO_SND;
        spin_unlock_irq(shost->host_lock);
        if (lpfc_sli_issue_iocb(phba, pring, elsiocb, 0) == IOCB_ERROR) {
                spin_lock_irq(shost->host_lock);
                ndlp->nlp_flag &= ~NLP_LOGO_SND;
                spin_unlock_irq(shost->host_lock);
                lpfc_els_free_iocb(phba, elsiocb);
                return 1;
        }
        return 0;
}

/**
 * lpfc_fabric_block_timeout: Handler function to the fabric block timer.
 * @ptr: holder for the timer function associated data.
 *
 * This routine is invoked by the fabric iocb block timer after
 * timeout. It posts the fabric iocb block timeout event by setting the
 * WORKER_FABRIC_BLOCK_TMO bit to work port event bitmap and then invokes
 * lpfc_worker_wake_up() routine to wake up the worker thread. It is for
 * the worker thread to invoke the lpfc_unblock_fabric_iocbs() on the
 * posted event WORKER_FABRIC_BLOCK_TMO.
 **/
void
lpfc_fabric_block_timeout(unsigned long ptr)
{
        struct lpfc_hba  *phba = (struct lpfc_hba *) ptr;
        unsigned long iflags;
        uint32_t tmo_posted;

        spin_lock_irqsave(&phba->pport->work_port_lock, iflags);
        tmo_posted = phba->pport->work_port_events & WORKER_FABRIC_BLOCK_TMO;
        if (!tmo_posted)
                phba->pport->work_port_events |= WORKER_FABRIC_BLOCK_TMO;
        spin_unlock_irqrestore(&phba->pport->work_port_lock, iflags);

        if (!tmo_posted)
                lpfc_worker_wake_up(phba);
        return;
}

/**
 * lpfc_resume_fabric_iocbs: Issue a fabric iocb from driver internal list.
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine issues one fabric iocb from the driver internal list to
 * the HBA. It first checks whether it's ready to issue one fabric iocb to
 * the HBA (whether there is no outstanding fabric iocb). If so, it shall
 * remove one pending fabric iocb from the driver internal list and invokes
 * lpfc_sli_issue_iocb() routine to send the fabric iocb to the HBA.
 **/
static void
lpfc_resume_fabric_iocbs(struct lpfc_hba *phba)
{
        struct lpfc_iocbq *iocb;
        unsigned long iflags;
        int ret;
        struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];
        IOCB_t *cmd;

repeat:
        iocb = NULL;
        spin_lock_irqsave(&phba->hbalock, iflags);
        /* Post any pending iocb to the SLI layer */
        if (atomic_read(&phba->fabric_iocb_count) == 0) {
                list_remove_head(&phba->fabric_iocb_list, iocb, typeof(*iocb),
                                 list);
                if (iocb)
                        /* Increment fabric iocb count to hold the position */
                        atomic_inc(&phba->fabric_iocb_count);
        }
        spin_unlock_irqrestore(&phba->hbalock, iflags);
        if (iocb) {
                iocb->fabric_iocb_cmpl = iocb->iocb_cmpl;
                iocb->iocb_cmpl = lpfc_cmpl_fabric_iocb;
                iocb->iocb_flag |= LPFC_IO_FABRIC;

                lpfc_debugfs_disc_trc(iocb->vport, LPFC_DISC_TRC_ELS_CMD,
                        "Fabric sched1:   ste:x%x",
                        iocb->vport->port_state, 0, 0);

                ret = lpfc_sli_issue_iocb(phba, pring, iocb, 0);

                if (ret == IOCB_ERROR) {
                        iocb->iocb_cmpl = iocb->fabric_iocb_cmpl;
                        iocb->fabric_iocb_cmpl = NULL;
                        iocb->iocb_flag &= ~LPFC_IO_FABRIC;
                        cmd = &iocb->iocb;
                        cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
                        cmd->un.ulpWord[4] = IOERR_SLI_ABORTED;
                        iocb->iocb_cmpl(phba, iocb, iocb);

                        atomic_dec(&phba->fabric_iocb_count);
                        goto repeat;
                }
        }

        return;
}

/**
 * lpfc_unblock_fabric_iocbs: Unblock issuing fabric iocb command.
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine unblocks the  issuing fabric iocb command. The function
 * will clear the fabric iocb block bit and then invoke the routine
 * lpfc_resume_fabric_iocbs() to issue one of the pending fabric iocb
 * from the driver internal fabric iocb list.
 **/
void
lpfc_unblock_fabric_iocbs(struct lpfc_hba *phba)
{
        clear_bit(FABRIC_COMANDS_BLOCKED, &phba->bit_flags);

        lpfc_resume_fabric_iocbs(phba);
        return;
}

/**
 * lpfc_block_fabric_iocbs: Block issuing fabric iocb command.
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine blocks the issuing fabric iocb for a specified amount of
 * time (currently 100 ms). This is done by set the fabric iocb block bit
 * and set up a timeout timer for 100ms. When the block bit is set, no more
 * fabric iocb will be issued out of the HBA.
 **/
static void
lpfc_block_fabric_iocbs(struct lpfc_hba *phba)
{
        int blocked;

        blocked = test_and_set_bit(FABRIC_COMANDS_BLOCKED, &phba->bit_flags);
        /* Start a timer to unblock fabric iocbs after 100ms */
        if (!blocked)
                mod_timer(&phba->fabric_block_timer, jiffies + HZ/10 );

        return;
}

/**
 * lpfc_cmpl_fabric_iocb: Completion callback function for fabric iocb.
 * @phba: pointer to lpfc hba data structure.
 * @cmdiocb: pointer to lpfc command iocb data structure.
 * @rspiocb: pointer to lpfc response iocb data structure.
 *
 * This routine is the callback function that is put to the fabric iocb's
 * callback function pointer (iocb->iocb_cmpl). The original iocb's callback
 * function pointer has been stored in iocb->fabric_iocb_cmpl. This callback
 * function first restores and invokes the original iocb's callback function
 * and then invokes the lpfc_resume_fabric_iocbs() routine to issue the next
 * fabric bound iocb from the driver internal fabric iocb list onto the wire.
 **/
static void
lpfc_cmpl_fabric_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
        struct lpfc_iocbq *rspiocb)
{
        struct ls_rjt stat;

        if ((cmdiocb->iocb_flag & LPFC_IO_FABRIC) != LPFC_IO_FABRIC)
                BUG();

        switch (rspiocb->iocb.ulpStatus) {
                case IOSTAT_NPORT_RJT:
                case IOSTAT_FABRIC_RJT:
                        if (rspiocb->iocb.un.ulpWord[4] & RJT_UNAVAIL_TEMP) {
                                lpfc_block_fabric_iocbs(phba);
                        }
                        break;

                case IOSTAT_NPORT_BSY:
                case IOSTAT_FABRIC_BSY:
                        lpfc_block_fabric_iocbs(phba);
                        break;

                case IOSTAT_LS_RJT:
                        stat.un.lsRjtError =
                                be32_to_cpu(rspiocb->iocb.un.ulpWord[4]);
                        if ((stat.un.b.lsRjtRsnCode == LSRJT_UNABLE_TPC) ||
                                (stat.un.b.lsRjtRsnCode == LSRJT_LOGICAL_BSY))
                                lpfc_block_fabric_iocbs(phba);
                        break;
        }

        if (atomic_read(&phba->fabric_iocb_count) == 0)
                BUG();

        cmdiocb->iocb_cmpl = cmdiocb->fabric_iocb_cmpl;
        cmdiocb->fabric_iocb_cmpl = NULL;
        cmdiocb->iocb_flag &= ~LPFC_IO_FABRIC;
        cmdiocb->iocb_cmpl(phba, cmdiocb, rspiocb);

        atomic_dec(&phba->fabric_iocb_count);
        if (!test_bit(FABRIC_COMANDS_BLOCKED, &phba->bit_flags)) {
                /* Post any pending iocbs to HBA */
                lpfc_resume_fabric_iocbs(phba);
        }
}

/**
 * lpfc_issue_fabric_iocb: Issue a fabric iocb command.
 * @phba: pointer to lpfc hba data structure.
 * @iocb: pointer to lpfc command iocb data structure.
 *
 * This routine is used as the top-level API for issuing a fabric iocb command
 * such as FLOGI and FDISC. To accommodate certain switch fabric, this driver
 * function makes sure that only one fabric bound iocb will be outstanding at
 * any given time. As such, this function will first check to see whether there
 * is already an outstanding fabric iocb on the wire. If so, it will put the
 * newly issued iocb onto the driver internal fabric iocb list, waiting to be
 * issued later. Otherwise, it will issue the iocb on the wire and update the
 * fabric iocb count it indicate that there is one fabric iocb on the wire.
 *
 * Note, this implementation has a potential sending out fabric IOCBs out of
 * order. The problem is caused by the construction of the "ready" boolen does
 * not include the condition that the internal fabric IOCB list is empty. As
 * such, it is possible a fabric IOCB issued by this routine might be "jump"
 * ahead of the fabric IOCBs in the internal list.
 *
 * Return code
 *   IOCB_SUCCESS - either fabric iocb put on the list or issued successfully
 *   IOCB_ERROR - failed to issue fabric iocb
 **/
static int
lpfc_issue_fabric_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *iocb)
{
        unsigned long iflags;
        struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];
        int ready;
        int ret;

        if (atomic_read(&phba->fabric_iocb_count) > 1)
                BUG();

        spin_lock_irqsave(&phba->hbalock, iflags);
        ready = atomic_read(&phba->fabric_iocb_count) == 0 &&
                !test_bit(FABRIC_COMANDS_BLOCKED, &phba->bit_flags);

        if (ready)
                /* Increment fabric iocb count to hold the position */
                atomic_inc(&phba->fabric_iocb_count);
        spin_unlock_irqrestore(&phba->hbalock, iflags);
        if (ready) {
                iocb->fabric_iocb_cmpl = iocb->iocb_cmpl;
                iocb->iocb_cmpl = lpfc_cmpl_fabric_iocb;
                iocb->iocb_flag |= LPFC_IO_FABRIC;

                lpfc_debugfs_disc_trc(iocb->vport, LPFC_DISC_TRC_ELS_CMD,
                        "Fabric sched2:   ste:x%x",
                        iocb->vport->port_state, 0, 0);

                ret = lpfc_sli_issue_iocb(phba, pring, iocb, 0);

                if (ret == IOCB_ERROR) {
                        iocb->iocb_cmpl = iocb->fabric_iocb_cmpl;
                        iocb->fabric_iocb_cmpl = NULL;
                        iocb->iocb_flag &= ~LPFC_IO_FABRIC;
                        atomic_dec(&phba->fabric_iocb_count);
                }
        } else {
                spin_lock_irqsave(&phba->hbalock, iflags);
                list_add_tail(&iocb->list, &phba->fabric_iocb_list);
                spin_unlock_irqrestore(&phba->hbalock, iflags);
                ret = IOCB_SUCCESS;
        }
        return ret;
}

/**
 * lpfc_fabric_abort_vport: Abort a vport's iocbs from driver fabric iocb list.
 * @vport: pointer to a virtual N_Port data structure.
 *
 * This routine aborts all the IOCBs associated with a @vport from the
 * driver internal fabric IOCB list. The list contains fabric IOCBs to be
 * issued to the ELS IOCB ring. This abort function walks the fabric IOCB
 * list, removes each IOCB associated with the @vport off the list, set the
 * status feild to IOSTAT_LOCAL_REJECT, and invokes the callback function
 * associated with the IOCB.
 **/
static void lpfc_fabric_abort_vport(struct lpfc_vport *vport)
{
        LIST_HEAD(completions);
        struct lpfc_hba  *phba = vport->phba;
        struct lpfc_iocbq *tmp_iocb, *piocb;
        IOCB_t *cmd;

        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(piocb, tmp_iocb, &phba->fabric_iocb_list,
                                 list) {

                if (piocb->vport != vport)
                        continue;

                list_move_tail(&piocb->list, &completions);
        }
        spin_unlock_irq(&phba->hbalock);

        while (!list_empty(&completions)) {
                piocb = list_get_first(&completions, struct lpfc_iocbq, list);
                list_del_init(&piocb->list);

                cmd = &piocb->iocb;
                cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
                cmd->un.ulpWord[4] = IOERR_SLI_ABORTED;
                (piocb->iocb_cmpl) (phba, piocb, piocb);
        }
}

/**
 * lpfc_fabric_abort_nport: Abort a ndlp's iocbs from driver fabric iocb list.
 * @ndlp: pointer to a node-list data structure.
 *
 * This routine aborts all the IOCBs associated with an @ndlp from the
 * driver internal fabric IOCB list. The list contains fabric IOCBs to be
 * issued to the ELS IOCB ring. This abort function walks the fabric IOCB
 * list, removes each IOCB associated with the @ndlp off the list, set the
 * status feild to IOSTAT_LOCAL_REJECT, and invokes the callback function
 * associated with the IOCB.
 **/
void lpfc_fabric_abort_nport(struct lpfc_nodelist *ndlp)
{
        LIST_HEAD(completions);
        struct lpfc_hba  *phba = ndlp->vport->phba;
        struct lpfc_iocbq *tmp_iocb, *piocb;
        struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];
        IOCB_t *cmd;

        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(piocb, tmp_iocb, &phba->fabric_iocb_list,
                                 list) {
                if ((lpfc_check_sli_ndlp(phba, pring, piocb, ndlp))) {

                        list_move_tail(&piocb->list, &completions);
                }
        }
        spin_unlock_irq(&phba->hbalock);

        while (!list_empty(&completions)) {
                piocb = list_get_first(&completions, struct lpfc_iocbq, list);
                list_del_init(&piocb->list);

                cmd = &piocb->iocb;
                cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
                cmd->un.ulpWord[4] = IOERR_SLI_ABORTED;
                (piocb->iocb_cmpl) (phba, piocb, piocb);
        }
}

/**
 * lpfc_fabric_abort_hba: Abort all iocbs on driver fabric iocb list.
 * @phba: pointer to lpfc hba data structure.
 *
 * This routine aborts all the IOCBs currently on the driver internal
 * fabric IOCB list. The list contains fabric IOCBs to be issued to the ELS
 * IOCB ring. This function takes the entire IOCB list off the fabric IOCB
 * list, removes IOCBs off the list, set the status feild to
 * IOSTAT_LOCAL_REJECT, and invokes the callback function associated with
 * the IOCB.
 **/
void lpfc_fabric_abort_hba(struct lpfc_hba *phba)
{
        LIST_HEAD(completions);
        struct lpfc_iocbq *piocb;
        IOCB_t *cmd;

        spin_lock_irq(&phba->hbalock);
        list_splice_init(&phba->fabric_iocb_list, &completions);
        spin_unlock_irq(&phba->hbalock);

        while (!list_empty(&completions)) {
                piocb = list_get_first(&completions, struct lpfc_iocbq, list);
                list_del_init(&piocb->list);

                cmd = &piocb->iocb;
                cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
                cmd->un.ulpWord[4] = IOERR_SLI_ABORTED;
                (piocb->iocb_cmpl) (phba, piocb, piocb);
        }
}