git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/lpfc/lpfc_scsi.c

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Fibre Channel Host Bus Adapters.                                *
   4  * Copyright (C) 2004-2005 Emulex.  All rights reserved.           *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
   8  *                                                                 *
   9  * This program is free software; you can redistribute it and/or   *
  10  * modify it under the terms of version 2 of the GNU General       *
  11  * Public License as published by the Free Software Foundation.    *
  12  * This program is distributed in the hope that it will be useful. *
  13  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  14  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  15  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  16  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  17  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  18  * more details, a copy of which can be found in the file COPYING  *
  19  * included with this package.                                     *
  20  *******************************************************************/
  21
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <scsi/scsi_transport_fc.h>
  30
  31 #include "lpfc_version.h"
  32 #include "lpfc_hw.h"
  33 #include "lpfc_sli.h"
  34 #include "lpfc_disc.h"
  35 #include "lpfc_scsi.h"
  36 #include "lpfc.h"
  37 #include "lpfc_logmsg.h"
  38 #include "lpfc_crtn.h"
  39
  40 #define LPFC_RESET_WAIT  2
  41 #define LPFC_ABORT_WAIT  2
  42
  43
  44 /*
  45  * This routine allocates a scsi buffer, which contains all the necessary
  46  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
  47  * contains information to build the IOCB.  The DMAable region contains
  48  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
  49  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
  50  * and the BPL BDE is setup in the IOCB.
  51  */
  52 static struct lpfc_scsi_buf *
  53 lpfc_new_scsi_buf(struct lpfc_hba * phba)
  54 {
  55         struct lpfc_scsi_buf *psb;
  56         struct ulp_bde64 *bpl;
  57         IOCB_t *iocb;
  58         dma_addr_t pdma_phys;
  59         uint16_t iotag;
  60
  61         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
  62         if (!psb)
  63                 return NULL;
  64         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
  65         psb->scsi_hba = phba;
  66
  67         /*
  68          * Get memory from the pci pool to map the virt space to pci bus space
  69          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
  70          * struct fcp_rsp and the number of bde's necessary to support the
  71          * sg_tablesize.
  72          */
  73         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
  74                                                         &psb->dma_handle);
  75         if (!psb->data) {
  76                 kfree(psb);
  77                 return NULL;
  78         }
  79
  80         /* Initialize virtual ptrs to dma_buf region. */
  81         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
  82
  83         /* Allocate iotag for psb->cur_iocbq. */
  84         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
  85         if (iotag == 0) {
  86                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
  87                               psb->data, psb->dma_handle);
  88                 kfree (psb);
  89                 return NULL;
  90         }
  91         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
  92
  93         psb->fcp_cmnd = psb->data;
  94         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
  95         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
  96                                                         sizeof(struct fcp_rsp);
  97
  98         /* Initialize local short-hand pointers. */
  99         bpl = psb->fcp_bpl;
 100         pdma_phys = psb->dma_handle;
 101
 102         /*
 103          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 104          * list bdes.  Initialize the first two and leave the rest for
 105          * queuecommand.
 106          */
 107         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 108         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 109         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
 110         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
 111         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 112         bpl++;
 113
 114         /* Setup the physical region for the FCP RSP */
 115         pdma_phys += sizeof (struct fcp_cmnd);
 116         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 117         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 118         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
 119         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
 120         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 121
 122         /*
 123          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 124          * initialize it with all known data now.
 125          */
 126         pdma_phys += (sizeof (struct fcp_rsp));
 127         iocb = &psb->cur_iocbq.iocb;
 128         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 129         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
 130         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
 131         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 132         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
 133         iocb->ulpBdeCount = 1;
 134         iocb->ulpClass = CLASS3;
 135
 136         return psb;
 137 }
 138
 139 struct  lpfc_scsi_buf*
 140 lpfc_sli_get_scsi_buf(struct lpfc_hba * phba)
 141 {
 142         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 143         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 144
 145         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 146         return  lpfc_cmd;
 147 }
 148
 149 static void
 150 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 151 {
 152         /*
 153          * There are only two special cases to consider.  (1) the scsi command
 154          * requested scatter-gather usage or (2) the scsi command allocated
 155          * a request buffer, but did not request use_sg.  There is a third
 156          * case, but it does not require resource deallocation.
 157          */
 158         if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
 159                 dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
 160                                 psb->seg_cnt, psb->pCmd->sc_data_direction);
 161         } else {
 162                  if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
 163                         dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
 164                                                 psb->pCmd->request_bufflen,
 165                                                 psb->pCmd->sc_data_direction);
 166                  }
 167         }
 168
 169         psb->pCmd = NULL;
 170         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 171 }
 172
 173 static int
 174 lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
 175 {
 176         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 177         struct scatterlist *sgel = NULL;
 178         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 179         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 180         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 181         dma_addr_t physaddr;
 182         uint32_t i, num_bde = 0;
 183         int datadir = scsi_cmnd->sc_data_direction;
 184         int dma_error;
 185
 186         /*
 187          * There are three possibilities here - use scatter-gather segment, use
 188          * the single mapping, or neither.  Start the lpfc command prep by
 189          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 190          * data bde entry.
 191          */
 192         bpl += 2;
 193         if (scsi_cmnd->use_sg) {
 194                 /*
 195                  * The driver stores the segment count returned from pci_map_sg
 196                  * because this a count of dma-mappings used to map the use_sg
 197                  * pages.  They are not guaranteed to be the same for those
 198                  * architectures that implement an IOMMU.
 199                  */
 200                 sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
 201                 lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
 202                                                 scsi_cmnd->use_sg, datadir);
 203                 if (lpfc_cmd->seg_cnt == 0)
 204                         return 1;
 205
 206                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 207                         printk(KERN_ERR "%s: Too many sg segments from "
 208                                "dma_map_sg.  Config %d, seg_cnt %d",
 209                                __FUNCTION__, phba->cfg_sg_seg_cnt,
 210                                lpfc_cmd->seg_cnt);
 211                         dma_unmap_sg(&phba->pcidev->dev, sgel,
 212                                      lpfc_cmd->seg_cnt, datadir);
 213                         return 1;
 214                 }
 215
 216                 /*
 217                  * The driver established a maximum scatter-gather segment count
 218                  * during probe that limits the number of sg elements in any
 219                  * single scsi command.  Just run through the seg_cnt and format
 220                  * the bde's.
 221                  */
 222                 for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
 223                         physaddr = sg_dma_address(sgel);
 224                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 225                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 226                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
 227                         if (datadir == DMA_TO_DEVICE)
 228                                 bpl->tus.f.bdeFlags = 0;
 229                         else
 230                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 231                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 232                         bpl++;
 233                         sgel++;
 234                         num_bde++;
 235                 }
 236         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 237                 physaddr = dma_map_single(&phba->pcidev->dev,
 238                                           scsi_cmnd->request_buffer,
 239                                           scsi_cmnd->request_bufflen,
 240                                           datadir);
 241                 dma_error = dma_mapping_error(physaddr);
 242                 if (dma_error) {
 243                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 244                                 "%d:0718 Unable to dma_map_single "
 245                                 "request_buffer: x%x\n",
 246                                 phba->brd_no, dma_error);
 247                         return 1;
 248                 }
 249
 250                 lpfc_cmd->nonsg_phys = physaddr;
 251                 bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 252                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 253                 bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
 254                 if (datadir == DMA_TO_DEVICE)
 255                         bpl->tus.f.bdeFlags = 0;
 256                 else
 257                         bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 258                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
 259                 num_bde = 1;
 260                 bpl++;
 261         }
 262
 263         /*
 264          * Finish initializing those IOCB fields that are dependent on the
 265          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
 266          * reinitialized since all iocb memory resources are used many times
 267          * for transmit, receive, and continuation bpl's.
 268          */
 269         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 270         iocb_cmd->un.fcpi64.bdl.bdeSize +=
 271                 (num_bde * sizeof (struct ulp_bde64));
 272         iocb_cmd->ulpBdeCount = 1;
 273         iocb_cmd->ulpLe = 1;
 274         fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
 275         return 0;
 276 }
 277
 278 static void
 279 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
 280 {
 281         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 282         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 283         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 284         struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
 285         uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
 286         uint32_t resp_info = fcprsp->rspStatus2;
 287         uint32_t scsi_status = fcprsp->rspStatus3;
 288         uint32_t host_status = DID_OK;
 289         uint32_t rsplen = 0;
 290
 291         /*
 292          *  If this is a task management command, there is no
 293          *  scsi packet associated with this lpfc_cmd.  The driver
 294          *  consumes it.
 295          */
 296         if (fcpcmd->fcpCntl2) {
 297                 scsi_status = 0;
 298                 goto out;
 299         }
 300
 301         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 302                         "%d:0730 FCP command failed: RSP "
 303                         "Data: x%x x%x x%x x%x x%x x%x\n",
 304                         phba->brd_no, resp_info, scsi_status,
 305                         be32_to_cpu(fcprsp->rspResId),
 306                         be32_to_cpu(fcprsp->rspSnsLen),
 307                         be32_to_cpu(fcprsp->rspRspLen),
 308                         fcprsp->rspInfo3);
 309
 310         if (resp_info & RSP_LEN_VALID) {
 311                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 312                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 313                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 314                         host_status = DID_ERROR;
 315                         goto out;
 316                 }
 317         }
 318
 319         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 320                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 321                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 322                         snslen = SCSI_SENSE_BUFFERSIZE;
 323
 324                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 325         }
 326
 327         cmnd->resid = 0;
 328         if (resp_info & RESID_UNDER) {
 329                 cmnd->resid = be32_to_cpu(fcprsp->rspResId);
 330
 331                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 332                                 "%d:0716 FCP Read Underrun, expected %d, "
 333                                 "residual %d Data: x%x x%x x%x\n", phba->brd_no,
 334                                 be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
 335                                 fcpi_parm, cmnd->cmnd[0], cmnd->underflow);
 336
 337                 /*
 338                  * The cmnd->underflow is the minimum number of bytes that must
 339                  * be transfered for this command.  Provided a sense condition
 340                  * is not present, make sure the actual amount transferred is at
 341                  * least the underflow value or fail.
 342                  */
 343                 if (!(resp_info & SNS_LEN_VALID) &&
 344                     (scsi_status == SAM_STAT_GOOD) &&
 345                     (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
 346                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 347                                         "%d:0717 FCP command x%x residual "
 348                                         "underrun converted to error "
 349                                         "Data: x%x x%x x%x\n", phba->brd_no,
 350                                         cmnd->cmnd[0], cmnd->request_bufflen,
 351                                         cmnd->resid, cmnd->underflow);
 352
 353                         host_status = DID_ERROR;
 354                 }
 355         } else if (resp_info & RESID_OVER) {
 356                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 357                                 "%d:0720 FCP command x%x residual "
 358                                 "overrun error. Data: x%x x%x \n",
 359                                 phba->brd_no, cmnd->cmnd[0],
 360                                 cmnd->request_bufflen, cmnd->resid);
 361                 host_status = DID_ERROR;
 362
 363         /*
 364          * Check SLI validation that all the transfer was actually done
 365          * (fcpi_parm should be zero). Apply check only to reads.
 366          */
 367         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 368                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 369                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 370                         "%d:0734 FCP Read Check Error Data: "
 371                         "x%x x%x x%x x%x\n", phba->brd_no,
 372                         be32_to_cpu(fcpcmd->fcpDl),
 373                         be32_to_cpu(fcprsp->rspResId),
 374                         fcpi_parm, cmnd->cmnd[0]);
 375                 host_status = DID_ERROR;
 376                 cmnd->resid = cmnd->request_bufflen;
 377         }
 378
 379  out:
 380         cmnd->result = ScsiResult(host_status, scsi_status);
 381 }
 382
 383 static void
 384 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 385                         struct lpfc_iocbq *pIocbOut)
 386 {
 387         struct lpfc_scsi_buf *lpfc_cmd =
 388                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 389         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 390         struct lpfc_nodelist *pnode = rdata->pnode;
 391         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 392         unsigned long iflag;
 393
 394         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 395         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 396
 397         if (lpfc_cmd->status) {
 398                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 399                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 400                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 401                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 402                         lpfc_cmd->status = IOSTAT_DEFAULT;
 403
 404                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 405                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
 406                                 "x%x result: x%x Data: x%x x%x\n",
 407                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
 408                                 cmd->device->lun, lpfc_cmd->status,
 409                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
 410                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 411
 412                 switch (lpfc_cmd->status) {
 413                 case IOSTAT_FCP_RSP_ERROR:
 414                         /* Call FCP RSP handler to determine result */
 415                         lpfc_handle_fcp_err(lpfc_cmd);
 416                         break;
 417                 case IOSTAT_NPORT_BSY:
 418                 case IOSTAT_FABRIC_BSY:
 419                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 420                         break;
 421                 default:
 422                         cmd->result = ScsiResult(DID_ERROR, 0);
 423                         break;
 424                 }
 425
 426                 if ((pnode == NULL )
 427                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 428                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 429         } else {
 430                 cmd->result = ScsiResult(DID_OK, 0);
 431         }
 432
 433         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 434                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 435
 436                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 437                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
 438                                 "SNS x%x x%x Data: x%x x%x\n",
 439                                 phba->brd_no, cmd->device->id,
 440                                 cmd->device->lun, cmd, cmd->result,
 441                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
 442         }
 443
 444         cmd->scsi_done(cmd);
 445
 446         spin_lock_irqsave(phba->host->host_lock, iflag);
 447         lpfc_release_scsi_buf(phba, lpfc_cmd);
 448         spin_unlock_irqrestore(phba->host->host_lock, iflag);
 449 }
 450
 451 static void
 452 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
 453                         struct lpfc_nodelist *pnode)
 454 {
 455         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 456         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 457         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 458         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 459         int datadir = scsi_cmnd->sc_data_direction;
 460
 461         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 462         /* clear task management bits */
 463         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 464
 465         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 466                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 467
 468         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 469
 470         if (scsi_cmnd->device->tagged_supported) {
 471                 switch (scsi_cmnd->tag) {
 472                 case HEAD_OF_QUEUE_TAG:
 473                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 474                         break;
 475                 case ORDERED_QUEUE_TAG:
 476                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 477                         break;
 478                 default:
 479                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 480                         break;
 481                 }
 482         } else
 483                 fcp_cmnd->fcpCntl1 = 0;
 484
 485         /*
 486          * There are three possibilities here - use scatter-gather segment, use
 487          * the single mapping, or neither.  Start the lpfc command prep by
 488          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 489          * data bde entry.
 490          */
 491         if (scsi_cmnd->use_sg) {
 492                 if (datadir == DMA_TO_DEVICE) {
 493                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 494                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 495                         iocb_cmd->ulpPU = 0;
 496                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 497                         phba->fc4OutputRequests++;
 498                 } else {
 499                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 500                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 501                         iocb_cmd->un.fcpi.fcpi_parm =
 502                                 scsi_cmnd->request_bufflen;
 503                         fcp_cmnd->fcpCntl3 = READ_DATA;
 504                         phba->fc4InputRequests++;
 505                 }
 506         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 507                 if (datadir == DMA_TO_DEVICE) {
 508                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 509                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 510                         iocb_cmd->ulpPU = 0;
 511                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 512                         phba->fc4OutputRequests++;
 513                 } else {
 514                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 515                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 516                         iocb_cmd->un.fcpi.fcpi_parm =
 517                                 scsi_cmnd->request_bufflen;
 518                         fcp_cmnd->fcpCntl3 = READ_DATA;
 519                         phba->fc4InputRequests++;
 520                 }
 521         } else {
 522                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 523                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 524                 iocb_cmd->ulpPU = 0;
 525                 fcp_cmnd->fcpCntl3 = 0;
 526                 phba->fc4ControlRequests++;
 527         }
 528
 529         /*
 530          * Finish initializing those IOCB fields that are independent
 531          * of the scsi_cmnd request_buffer
 532          */
 533         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 534         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 535                 piocbq->iocb.ulpFCP2Rcvy = 1;
 536
 537         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 538         piocbq->context1  = lpfc_cmd;
 539         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 540         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 541 }
 542
 543 static int
 544 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
 545                              struct lpfc_scsi_buf *lpfc_cmd,
 546                              uint8_t task_mgmt_cmd)
 547 {
 548         struct lpfc_sli *psli;
 549         struct lpfc_iocbq *piocbq;
 550         IOCB_t *piocb;
 551         struct fcp_cmnd *fcp_cmnd;
 552         struct scsi_device *scsi_dev = lpfc_cmd->pCmd->device;
 553         struct lpfc_rport_data *rdata = scsi_dev->hostdata;
 554         struct lpfc_nodelist *ndlp = rdata->pnode;
 555
 556         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 557                 return 0;
 558         }
 559
 560         psli = &phba->sli;
 561         piocbq = &(lpfc_cmd->cur_iocbq);
 562         piocb = &piocbq->iocb;
 563
 564         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 565         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 566                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 567         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 568
 569         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 570
 571         piocb->ulpContext = ndlp->nlp_rpi;
 572         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 573                 piocb->ulpFCP2Rcvy = 1;
 574         }
 575         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 576
 577         /* ulpTimeout is only one byte */
 578         if (lpfc_cmd->timeout > 0xff) {
 579                 /*
 580                  * Do not timeout the command at the firmware level.
 581                  * The driver will provide the timeout mechanism.
 582                  */
 583                 piocb->ulpTimeout = 0;
 584         } else {
 585                 piocb->ulpTimeout = lpfc_cmd->timeout;
 586         }
 587
 588         lpfc_cmd->rdata = rdata;
 589
 590         switch (task_mgmt_cmd) {
 591         case FCP_LUN_RESET:
 592                 /* Issue LUN Reset to TGT <num> LUN <num> */
 593                 lpfc_printf_log(phba,
 594                                 KERN_INFO,
 595                                 LOG_FCP,
 596                                 "%d:0703 Issue LUN Reset to TGT %d LUN %d "
 597                                 "Data: x%x x%x\n",
 598                                 phba->brd_no,
 599                                 scsi_dev->id, scsi_dev->lun,
 600                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 601
 602                 break;
 603         case FCP_ABORT_TASK_SET:
 604                 /* Issue Abort Task Set to TGT <num> LUN <num> */
 605                 lpfc_printf_log(phba,
 606                                 KERN_INFO,
 607                                 LOG_FCP,
 608                                 "%d:0701 Issue Abort Task Set to TGT %d LUN %d "
 609                                 "Data: x%x x%x\n",
 610                                 phba->brd_no,
 611                                 scsi_dev->id, scsi_dev->lun,
 612                                 ndlp->nlp_rpi, ndlp->nlp_flag);
 613
 614                 break;
 615         case FCP_TARGET_RESET:
 616                 /* Issue Target Reset to TGT <num> */
 617                 lpfc_printf_log(phba,
 618                                 KERN_INFO,
 619                                 LOG_FCP,
 620                                 "%d:0702 Issue Target Reset to TGT %d "
 621                                 "Data: x%x x%x\n",
 622                                 phba->brd_no,
 623                                 scsi_dev->id, ndlp->nlp_rpi,
 624                                 ndlp->nlp_flag);
 625                 break;
 626         }
 627
 628         return (1);
 629 }
 630
 631 static int
 632 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba)
 633 {
 634         struct lpfc_iocbq *iocbq;
 635         struct lpfc_iocbq *iocbqrsp;
 636         int ret;
 637
 638         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
 639         if (!ret)
 640                 return FAILED;
 641
 642         lpfc_cmd->scsi_hba = phba;
 643         iocbq = &lpfc_cmd->cur_iocbq;
 644         iocbqrsp = lpfc_sli_get_iocbq(phba);
 645
 646         if (!iocbqrsp)
 647                 return FAILED;
 648
 649         ret = lpfc_sli_issue_iocb_wait(phba,
 650                                        &phba->sli.ring[phba->sli.fcp_ring],
 651                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 652         if (ret != IOCB_SUCCESS) {
 653                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 654                 ret = FAILED;
 655         } else {
 656                 ret = SUCCESS;
 657                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 658                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 659                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 660                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 661                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 662         }
 663
 664         lpfc_sli_release_iocbq(phba, iocbqrsp);
 665         return ret;
 666 }
 667
 668 const char *
 669 lpfc_info(struct Scsi_Host *host)
 670 {
 671         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata[0];
 672         int len;
 673         static char  lpfcinfobuf[384];
 674
 675         memset(lpfcinfobuf,0,384);
 676         if (phba && phba->pcidev){
 677                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 678                 len = strlen(lpfcinfobuf);
 679                 snprintf(lpfcinfobuf + len,
 680                         384-len,
 681                         " on PCI bus %02x device %02x irq %d",
 682                         phba->pcidev->bus->number,
 683                         phba->pcidev->devfn,
 684                         phba->pcidev->irq);
 685                 len = strlen(lpfcinfobuf);
 686                 if (phba->Port[0]) {
 687                         snprintf(lpfcinfobuf + len,
 688                                  384-len,
 689                                  " port %s",
 690                                  phba->Port);
 691                 }
 692         }
 693         return lpfcinfobuf;
 694 }
 695
 696 static int
 697 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 698 {
 699         struct lpfc_hba *phba =
 700                 (struct lpfc_hba *) cmnd->device->host->hostdata[0];
 701         struct lpfc_sli *psli = &phba->sli;
 702         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 703         struct lpfc_nodelist *ndlp = rdata->pnode;
 704         struct lpfc_scsi_buf *lpfc_cmd;
 705         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 706         int err;
 707
 708         err = fc_remote_port_chkready(rport);
 709         if (err) {
 710                 cmnd->result = err;
 711                 goto out_fail_command;
 712         }
 713
 714         /*
 715          * Catch race where our node has transitioned, but the
 716          * transport is still transitioning.
 717          */
 718         if (!ndlp) {
 719                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 720                 goto out_fail_command;
 721         }
 722         lpfc_cmd = lpfc_sli_get_scsi_buf (phba);
 723         if (lpfc_cmd == NULL) {
 724                 printk(KERN_WARNING "%s: No buffer available - list empty, "
 725                        "total count %d\n", __FUNCTION__, phba->total_scsi_bufs);
 726                 goto out_host_busy;
 727         }
 728
 729         /*
 730          * Store the midlayer's command structure for the completion phase
 731          * and complete the command initialization.
 732          */
 733         lpfc_cmd->pCmd  = cmnd;
 734         lpfc_cmd->rdata = rdata;
 735         lpfc_cmd->timeout = 0;
 736         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 737         cmnd->scsi_done = done;
 738
 739         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 740         if (err)
 741                 goto out_host_busy_free_buf;
 742
 743         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
 744
 745         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 746                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 747         if (err)
 748                 goto out_host_busy_free_buf;
 749         return 0;
 750
 751  out_host_busy_free_buf:
 752         lpfc_release_scsi_buf(phba, lpfc_cmd);
 753         cmnd->host_scribble = NULL;
 754  out_host_busy:
 755         return SCSI_MLQUEUE_HOST_BUSY;
 756
 757  out_fail_command:
 758         done(cmnd);
 759         return 0;
 760 }
 761
 762 static int
 763 __lpfc_abort_handler(struct scsi_cmnd *cmnd)
 764 {
 765         struct lpfc_hba *phba =
 766                         (struct lpfc_hba *)cmnd->device->host->hostdata[0];
 767         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
 768         struct lpfc_iocbq *iocb;
 769         struct lpfc_iocbq *abtsiocb;
 770         struct lpfc_scsi_buf *lpfc_cmd;
 771         IOCB_t *cmd, *icmd;
 772         unsigned int loop_count = 0;
 773         int ret = SUCCESS;
 774
 775
 776         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
 777         BUG_ON(!lpfc_cmd);
 778
 779         /*
 780          * If pCmd field of the corresponding lpfc_scsi_buf structure
 781          * points to a different SCSI command, then the driver has
 782          * already completed this command, but the midlayer did not
 783          * see the completion before the eh fired.  Just return
 784          * SUCCESS.
 785          */
 786         iocb = &lpfc_cmd->cur_iocbq;
 787         if (lpfc_cmd->pCmd != cmnd)
 788                 goto out;
 789
 790         BUG_ON(iocb->context1 != lpfc_cmd);
 791
 792         abtsiocb = lpfc_sli_get_iocbq(phba);
 793         if (abtsiocb == NULL) {
 794                 ret = FAILED;
 795                 goto out;
 796         }
 797
 798         /*
 799          * The scsi command can not be in txq and it is in flight because the
 800          * pCmd is still pointig at the SCSI command we have to abort. There
 801          * is no need to search the txcmplq. Just send an abort to the FW.
 802          */
 803
 804         cmd = &iocb->iocb;
 805         icmd = &abtsiocb->iocb;
 806         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
 807         icmd->un.acxri.abortContextTag = cmd->ulpContext;
 808         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
 809
 810         icmd->ulpLe = 1;
 811         icmd->ulpClass = cmd->ulpClass;
 812         if (phba->hba_state >= LPFC_LINK_UP)
 813                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
 814         else
 815                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
 816
 817         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
 818         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
 819                 lpfc_sli_release_iocbq(phba, abtsiocb);
 820                 ret = FAILED;
 821                 goto out;
 822         }
 823
 824         /* Wait for abort to complete */
 825         while (lpfc_cmd->pCmd == cmnd)
 826         {
 827                 spin_unlock_irq(phba->host->host_lock);
 828                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
 829                 spin_lock_irq(phba->host->host_lock);
 830                 if (++loop_count
 831                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
 832                         break;
 833         }
 834
 835         if (lpfc_cmd->pCmd == cmnd) {
 836                 ret = FAILED;
 837                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 838                                 "%d:0748 abort handler timed out waiting for "
 839                                 "abort to complete: ret %#x, ID %d, LUN %d, "
 840                                 "snum %#lx\n",
 841                                 phba->brd_no,  ret, cmnd->device->id,
 842                                 cmnd->device->lun, cmnd->serial_number);
 843         }
 844
 845  out:
 846         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 847                         "%d:0749 SCSI layer issued abort device: ret %#x, "
 848                         "ID %d, LUN %d, snum %#lx\n",
 849                         phba->brd_no, ret, cmnd->device->id,
 850                         cmnd->device->lun, cmnd->serial_number);
 851
 852         return ret;
 853 }
 854
 855 static int
 856 lpfc_abort_handler(struct scsi_cmnd *cmnd)
 857 {
 858         int rc;
 859         spin_lock_irq(cmnd->device->host->host_lock);
 860         rc = __lpfc_abort_handler(cmnd);
 861         spin_unlock_irq(cmnd->device->host->host_lock);
 862         return rc;
 863 }
 864
 865 static int
 866 __lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 867 {
 868         struct Scsi_Host *shost = cmnd->device->host;
 869         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
 870         struct lpfc_scsi_buf *lpfc_cmd;
 871         struct lpfc_iocbq *iocbq, *iocbqrsp;
 872         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 873         struct lpfc_nodelist *pnode = rdata->pnode;
 874         int ret = FAILED;
 875         int cnt, loopcnt;
 876
 877         /*
 878          * If target is not in a MAPPED state, delay the reset until
 879          * target is rediscovered or nodev timeout expires.
 880          */
 881         while ( 1 ) {
 882                 if (!pnode)
 883                         break;
 884
 885                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
 886                         spin_unlock_irq(phba->host->host_lock);
 887                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
 888                         spin_lock_irq(phba->host->host_lock);
 889                 }
 890                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
 891                         break;
 892         }
 893
 894         lpfc_cmd = lpfc_sli_get_scsi_buf (phba);
 895         if (lpfc_cmd == NULL)
 896                 goto out;
 897
 898         lpfc_cmd->pCmd = cmnd;
 899         lpfc_cmd->timeout = 60;
 900         lpfc_cmd->scsi_hba = phba;
 901
 902         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
 903         if (!ret)
 904                 goto out_free_scsi_buf;
 905
 906         iocbq = &lpfc_cmd->cur_iocbq;
 907
 908         /* get a buffer for this IOCB command response */
 909         iocbqrsp = lpfc_sli_get_iocbq(phba);
 910         if (iocbqrsp == NULL)
 911                 goto out_free_scsi_buf;
 912
 913         ret = lpfc_sli_issue_iocb_wait(phba,
 914                                        &phba->sli.ring[phba->sli.fcp_ring],
 915                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 916         if (ret == IOCB_SUCCESS)
 917                 ret = SUCCESS;
 918
 919         lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 920         lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 921         if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT)
 922                 if (lpfc_cmd->result & IOERR_DRVR_MASK)
 923                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 924
 925         /*
 926          * All outstanding txcmplq I/Os should have been aborted by the target.
 927          * Unfortunately, some targets do not abide by this forcing the driver
 928          * to double check.
 929          */
 930         lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
 931                             cmnd->device->id, cmnd->device->lun, 0,
 932                             LPFC_CTX_LUN);
 933
 934         loopcnt = 0;
 935         while((cnt = lpfc_sli_sum_iocb(phba,
 936                                        &phba->sli.ring[phba->sli.fcp_ring],
 937                                        cmnd->device->id, cmnd->device->lun,
 938                                        LPFC_CTX_LUN))) {
 939                 spin_unlock_irq(phba->host->host_lock);
 940                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
 941                 spin_lock_irq(phba->host->host_lock);
 942
 943                 if (++loopcnt
 944                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
 945                         break;
 946         }
 947
 948         if (cnt) {
 949                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 950                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
 951                         phba->brd_no, cnt);
 952                 ret = FAILED;
 953         }
 954
 955         lpfc_sli_release_iocbq(phba, iocbqrsp);
 956
 957 out_free_scsi_buf:
 958         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 959                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
 960                         "Data: x%x x%x x%x\n",
 961                         phba->brd_no, lpfc_cmd->pCmd->device->id,
 962                         lpfc_cmd->pCmd->device->lun, ret, lpfc_cmd->status,
 963                         lpfc_cmd->result);
 964         lpfc_release_scsi_buf(phba, lpfc_cmd);
 965 out:
 966         return ret;
 967 }
 968
 969 static int
 970 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 971 {
 972         int rc;
 973         spin_lock_irq(cmnd->device->host->host_lock);
 974         rc = __lpfc_reset_lun_handler(cmnd);
 975         spin_unlock_irq(cmnd->device->host->host_lock);
 976         return rc;
 977 }
 978
 979 /*
 980  * Note: midlayer calls this function with the host_lock held
 981  */
 982 static int
 983 __lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
 984 {
 985         struct Scsi_Host *shost = cmnd->device->host;
 986         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata[0];
 987         struct lpfc_nodelist *ndlp = NULL;
 988         int match;
 989         int ret = FAILED, i, err_count = 0;
 990         int cnt, loopcnt;
 991         unsigned int midlayer_id = 0;
 992         struct lpfc_scsi_buf * lpfc_cmd;
 993
 994         lpfc_cmd = lpfc_sli_get_scsi_buf (phba);
 995         if (lpfc_cmd == NULL)
 996                 goto out;
 997
 998         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
 999         lpfc_cmd->timeout = 60;
1000         lpfc_cmd->pCmd = cmnd;
1001         lpfc_cmd->scsi_hba = phba;
1002
1003         /*
1004          * Since the driver manages a single bus device, reset all
1005          * targets known to the driver.  Should any target reset
1006          * fail, this routine returns failure to the midlayer.
1007          */
1008         midlayer_id = cmnd->device->id;
1009         for (i = 0; i < MAX_FCP_TARGET; i++) {
1010                 /* Search the mapped list for this target ID */
1011                 match = 0;
1012                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1013                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1014                                 match = 1;
1015                                 break;
1016                         }
1017                 }
1018                 if (!match)
1019                         continue;
1020
1021                 lpfc_cmd->pCmd->device->id = i;
1022                 lpfc_cmd->pCmd->device->hostdata = ndlp->rport->dd_data;
1023                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba);
1024                 if (ret != SUCCESS) {
1025                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
1026                                 "%d:0713 Bus Reset on target %d failed\n",
1027                                 phba->brd_no, i);
1028                         err_count++;
1029                 }
1030         }
1031
1032         cmnd->device->id = midlayer_id;
1033         loopcnt = 0;
1034         while((cnt = lpfc_sli_sum_iocb(phba,
1035                                 &phba->sli.ring[phba->sli.fcp_ring],
1036                                 0, 0, LPFC_CTX_HOST))) {
1037                 spin_unlock_irq(phba->host->host_lock);
1038                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1039                 spin_lock_irq(phba->host->host_lock);
1040
1041                 if (++loopcnt
1042                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1043                         break;
1044         }
1045
1046         if (cnt) {
1047                 /* flush all outstanding commands on the host */
1048                 i = lpfc_sli_abort_iocb(phba,
1049                                 &phba->sli.ring[phba->sli.fcp_ring], 0, 0, 0,
1050                                 LPFC_CTX_HOST);
1051
1052                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
1053                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1054                    phba->brd_no, cnt, i);
1055         }
1056
1057         if (cnt == 0)
1058                 ret = SUCCESS;
1059         else
1060                 ret = FAILED;
1061
1062         lpfc_release_scsi_buf(phba, lpfc_cmd);
1063         lpfc_printf_log(phba,
1064                         KERN_ERR,
1065                         LOG_FCP,
1066                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1067                         phba->brd_no, ret);
1068 out:
1069         return ret;
1070 }
1071
1072 static int
1073 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1074 {
1075         int rc;
1076         spin_lock_irq(cmnd->device->host->host_lock);
1077         rc = __lpfc_reset_bus_handler(cmnd);
1078         spin_unlock_irq(cmnd->device->host->host_lock);
1079         return rc;
1080 }
1081
1082 static int
1083 lpfc_slave_alloc(struct scsi_device *sdev)
1084 {
1085         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata[0];
1086         struct lpfc_scsi_buf *scsi_buf = NULL;
1087         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1088         uint32_t total = 0, i;
1089         uint32_t num_to_alloc = 0;
1090         unsigned long flags;
1091
1092         if (!rport || fc_remote_port_chkready(rport))
1093                 return -ENXIO;
1094
1095         sdev->hostdata = rport->dd_data;
1096
1097         /*
1098          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1099          * available list of scsi buffers.  Don't allocate more than the
1100          * HBA limit conveyed to the midlayer via the host structure.  The
1101          * formula accounts for the lun_queue_depth + error handlers + 1
1102          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1103          */
1104         total = phba->total_scsi_bufs;
1105         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1106         if (total >= phba->cfg_hba_queue_depth) {
1107                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1108                                 "%d:0704 At limitation of %d preallocated "
1109                                 "command buffers\n", phba->brd_no, total);
1110                 return 0;
1111         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1112                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1113                                 "%d:0705 Allocation request of %d command "
1114                                 "buffers will exceed max of %d.  Reducing "
1115                                 "allocation request to %d.\n", phba->brd_no,
1116                                 num_to_alloc, phba->cfg_hba_queue_depth,
1117                                 (phba->cfg_hba_queue_depth - total));
1118                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1119         }
1120
1121         for (i = 0; i < num_to_alloc; i++) {
1122                 scsi_buf = lpfc_new_scsi_buf(phba);
1123                 if (!scsi_buf) {
1124                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1125                                         "%d:0706 Failed to allocate command "
1126                                         "buffer\n", phba->brd_no);
1127                         break;
1128                 }
1129
1130                 spin_lock_irqsave(phba->host->host_lock, flags);
1131                 phba->total_scsi_bufs++;
1132                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1133                 spin_unlock_irqrestore(phba->host->host_lock, flags);
1134         }
1135         return 0;
1136 }
1137
1138 static int
1139 lpfc_slave_configure(struct scsi_device *sdev)
1140 {
1141         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata[0];
1142         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1143
1144         if (sdev->tagged_supported)
1145                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1146         else
1147                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1148
1149         /*
1150          * Initialize the fc transport attributes for the target
1151          * containing this scsi device.  Also note that the driver's
1152          * target pointer is stored in the starget_data for the
1153          * driver's sysfs entry point functions.
1154          */
1155         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1156
1157         return 0;
1158 }
1159
1160 static void
1161 lpfc_slave_destroy(struct scsi_device *sdev)
1162 {
1163         sdev->hostdata = NULL;
1164         return;
1165 }
1166
1167 struct scsi_host_template lpfc_template = {
1168         .module                 = THIS_MODULE,
1169         .name                   = LPFC_DRIVER_NAME,
1170         .info                   = lpfc_info,
1171         .queuecommand           = lpfc_queuecommand,
1172         .eh_abort_handler       = lpfc_abort_handler,
1173         .eh_device_reset_handler= lpfc_reset_lun_handler,
1174         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1175         .slave_alloc            = lpfc_slave_alloc,
1176         .slave_configure        = lpfc_slave_configure,
1177         .slave_destroy          = lpfc_slave_destroy,
1178         .this_id                = -1,
1179         .sg_tablesize           = LPFC_SG_SEG_CNT,
1180         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1181         .use_clustering         = ENABLE_CLUSTERING,
1182         .shost_attrs            = lpfc_host_attrs,
1183         .max_sectors            = 0xFFFF,
1184 };