2 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 * Maintained at www.Open-FCoE.org
23 * This file contains all processing regarding fc_rports. It contains the
24 * rport state machine and does all rport interaction with the transport class.
25 * There should be no other places in libfc that interact directly with the
26 * transport class in regards to adding and deleting rports.
28 * fc_rport's represent N_Port's within the fabric.
34 * The rport should never hold the rport mutex and then attempt to acquire
35 * either the lport or disc mutexes. The rport's mutex is considered lesser
36 * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for
37 * more comments on the heirarchy.
39 * The locking strategy is similar to the lport's strategy. The lock protects
40 * the rport's states and is held and released by the entry points to the rport
41 * block. All _enter_* functions correspond to rport states and expect the rport
42 * mutex to be locked before calling them. This means that rports only handle
43 * one request or response at a time, since they're not critical for the I/O
44 * path this potential over-use of the mutex is acceptable.
47 #include <linux/kernel.h>
48 #include <linux/spinlock.h>
49 #include <linux/interrupt.h>
50 #include <linux/rcupdate.h>
51 #include <linux/timer.h>
52 #include <linux/workqueue.h>
53 #include <asm/unaligned.h>
55 #include <scsi/libfc.h>
56 #include <scsi/fc_encode.h>
58 static int fc_rport_debug;
60 #define FC_DEBUG_RPORT(fmt...) \
66 struct workqueue_struct *rport_event_queue;
68 static void fc_rport_enter_plogi(struct fc_rport *);
69 static void fc_rport_enter_prli(struct fc_rport *);
70 static void fc_rport_enter_rtv(struct fc_rport *);
71 static void fc_rport_enter_ready(struct fc_rport *);
72 static void fc_rport_enter_logo(struct fc_rport *);
74 static void fc_rport_recv_plogi_req(struct fc_rport *,
75 struct fc_seq *, struct fc_frame *);
76 static void fc_rport_recv_prli_req(struct fc_rport *,
77 struct fc_seq *, struct fc_frame *);
78 static void fc_rport_recv_prlo_req(struct fc_rport *,
79 struct fc_seq *, struct fc_frame *);
80 static void fc_rport_recv_logo_req(struct fc_rport *,
81 struct fc_seq *, struct fc_frame *);
82 static void fc_rport_timeout(struct work_struct *);
83 static void fc_rport_error(struct fc_rport *, struct fc_frame *);
84 static void fc_rport_error_retry(struct fc_rport *, struct fc_frame *);
85 static void fc_rport_work(struct work_struct *);
87 static const char *fc_rport_state_names[] = {
88 [RPORT_ST_NONE] = "None",
89 [RPORT_ST_INIT] = "Init",
90 [RPORT_ST_PLOGI] = "PLOGI",
91 [RPORT_ST_PRLI] = "PRLI",
92 [RPORT_ST_RTV] = "RTV",
93 [RPORT_ST_READY] = "Ready",
94 [RPORT_ST_LOGO] = "LOGO",
97 static void fc_rport_rogue_destroy(struct device *dev)
99 struct fc_rport *rport = dev_to_rport(dev);
100 FC_DEBUG_RPORT("Destroying rogue rport (%6x)\n", rport->port_id);
104 struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *dp)
106 struct fc_rport *rport;
107 struct fc_rport_libfc_priv *rdata;
108 rport = kzalloc(sizeof(*rport) + sizeof(*rdata), GFP_KERNEL);
113 rdata = RPORT_TO_PRIV(rport);
115 rport->dd_data = rdata;
116 rport->port_id = dp->ids.port_id;
117 rport->port_name = dp->ids.port_name;
118 rport->node_name = dp->ids.node_name;
119 rport->roles = dp->ids.roles;
120 rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
122 * Note: all this libfc rogue rport code will be removed for
123 * upstream so it fine that this is really ugly and hacky right now.
125 device_initialize(&rport->dev);
126 rport->dev.release = fc_rport_rogue_destroy;
128 mutex_init(&rdata->rp_mutex);
129 rdata->local_port = dp->lp;
130 rdata->trans_state = FC_PORTSTATE_ROGUE;
131 rdata->rp_state = RPORT_ST_INIT;
132 rdata->event = RPORT_EV_NONE;
133 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
135 rdata->e_d_tov = dp->lp->e_d_tov;
136 rdata->r_a_tov = dp->lp->r_a_tov;
137 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
138 INIT_WORK(&rdata->event_work, fc_rport_work);
140 * For good measure, but not necessary as we should only
141 * add REAL rport to the lport list.
143 INIT_LIST_HEAD(&rdata->peers);
149 * fc_rport_state() - return a string for the state the rport is in
150 * @rport: The rport whose state we want to get a string for
152 static const char *fc_rport_state(struct fc_rport *rport)
155 struct fc_rport_libfc_priv *rdata = rport->dd_data;
157 cp = fc_rport_state_names[rdata->rp_state];
164 * fc_set_rport_loss_tmo() - Set the remote port loss timeout in seconds.
165 * @rport: Pointer to Fibre Channel remote port structure
166 * @timeout: timeout in seconds
168 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
171 rport->dev_loss_tmo = timeout + 5;
173 rport->dev_loss_tmo = 30;
175 EXPORT_SYMBOL(fc_set_rport_loss_tmo);
178 * fc_plogi_get_maxframe() - Get max payload from the common service parameters
179 * @flp: FLOGI payload structure
180 * @maxval: upper limit, may be less than what is in the service parameters
182 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
188 * Get max payload from the common service parameters and the
189 * class 3 receive data field size.
191 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
192 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
194 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
195 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
201 * fc_rport_state_enter() - Change the rport's state
202 * @rport: The rport whose state should change
203 * @new: The new state of the rport
205 * Locking Note: Called with the rport lock held
207 static void fc_rport_state_enter(struct fc_rport *rport,
208 enum fc_rport_state new)
210 struct fc_rport_libfc_priv *rdata = rport->dd_data;
211 if (rdata->rp_state != new)
213 rdata->rp_state = new;
216 static void fc_rport_work(struct work_struct *work)
219 struct fc_rport_libfc_priv *rdata =
220 container_of(work, struct fc_rport_libfc_priv, event_work);
221 enum fc_rport_event event;
222 enum fc_rport_trans_state trans_state;
223 struct fc_lport *lport = rdata->local_port;
224 struct fc_rport_operations *rport_ops;
225 struct fc_rport *rport = PRIV_TO_RPORT(rdata);
227 mutex_lock(&rdata->rp_mutex);
228 event = rdata->event;
229 rport_ops = rdata->ops;
231 if (event == RPORT_EV_CREATED) {
232 struct fc_rport *new_rport;
233 struct fc_rport_libfc_priv *new_rdata;
234 struct fc_rport_identifiers ids;
236 ids.port_id = rport->port_id;
237 ids.roles = rport->roles;
238 ids.port_name = rport->port_name;
239 ids.node_name = rport->node_name;
241 mutex_unlock(&rdata->rp_mutex);
243 new_rport = fc_remote_port_add(lport->host, 0, &ids);
246 * Switch from the rogue rport to the rport
247 * returned by the FC class.
249 new_rport->maxframe_size = rport->maxframe_size;
251 new_rdata = new_rport->dd_data;
252 new_rdata->e_d_tov = rdata->e_d_tov;
253 new_rdata->r_a_tov = rdata->r_a_tov;
254 new_rdata->ops = rdata->ops;
255 new_rdata->local_port = rdata->local_port;
256 new_rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
257 new_rdata->trans_state = FC_PORTSTATE_REAL;
258 mutex_init(&new_rdata->rp_mutex);
259 INIT_DELAYED_WORK(&new_rdata->retry_work,
261 INIT_LIST_HEAD(&new_rdata->peers);
262 INIT_WORK(&new_rdata->event_work, fc_rport_work);
264 fc_rport_state_enter(new_rport, RPORT_ST_READY);
266 FC_DBG("Failed to create the rport for port "
267 "(%6x).\n", ids.port_id);
268 event = RPORT_EV_FAILED;
270 put_device(&rport->dev);
272 rdata = new_rport->dd_data;
273 if (rport_ops->event_callback)
274 rport_ops->event_callback(lport, rport, event);
275 } else if ((event == RPORT_EV_FAILED) ||
276 (event == RPORT_EV_LOGO) ||
277 (event == RPORT_EV_STOP)) {
278 trans_state = rdata->trans_state;
279 mutex_unlock(&rdata->rp_mutex);
280 if (rport_ops->event_callback)
281 rport_ops->event_callback(lport, rport, event);
282 if (trans_state == FC_PORTSTATE_ROGUE)
283 put_device(&rport->dev);
285 port_id = rport->port_id;
286 fc_remote_port_delete(rport);
287 lport->tt.exch_mgr_reset(lport, 0, port_id);
288 lport->tt.exch_mgr_reset(lport, port_id, 0);
291 mutex_unlock(&rdata->rp_mutex);
295 * fc_rport_login() - Start the remote port login state machine
296 * @rport: Fibre Channel remote port
298 * Locking Note: Called without the rport lock held. This
299 * function will hold the rport lock, call an _enter_*
300 * function and then unlock the rport.
302 int fc_rport_login(struct fc_rport *rport)
304 struct fc_rport_libfc_priv *rdata = rport->dd_data;
306 mutex_lock(&rdata->rp_mutex);
308 FC_DEBUG_RPORT("Login to port (%6x)\n", rport->port_id);
310 fc_rport_enter_plogi(rport);
312 mutex_unlock(&rdata->rp_mutex);
318 * fc_rport_logoff() - Logoff and remove an rport
319 * @rport: Fibre Channel remote port to be removed
321 * Locking Note: Called without the rport lock held. This
322 * function will hold the rport lock, call an _enter_*
323 * function and then unlock the rport.
325 int fc_rport_logoff(struct fc_rport *rport)
327 struct fc_rport_libfc_priv *rdata = rport->dd_data;
329 mutex_lock(&rdata->rp_mutex);
331 FC_DEBUG_RPORT("Remove port (%6x)\n", rport->port_id);
333 fc_rport_enter_logo(rport);
336 * Change the state to NONE so that we discard
339 fc_rport_state_enter(rport, RPORT_ST_NONE);
341 mutex_unlock(&rdata->rp_mutex);
343 cancel_delayed_work_sync(&rdata->retry_work);
345 mutex_lock(&rdata->rp_mutex);
347 rdata->event = RPORT_EV_STOP;
348 queue_work(rport_event_queue, &rdata->event_work);
350 mutex_unlock(&rdata->rp_mutex);
356 * fc_rport_enter_ready() - The rport is ready
357 * @rport: Fibre Channel remote port that is ready
359 * Locking Note: The rport lock is expected to be held before calling
362 static void fc_rport_enter_ready(struct fc_rport *rport)
364 struct fc_rport_libfc_priv *rdata = rport->dd_data;
366 fc_rport_state_enter(rport, RPORT_ST_READY);
368 FC_DEBUG_RPORT("Port (%6x) is Ready\n", rport->port_id);
370 rdata->event = RPORT_EV_CREATED;
371 queue_work(rport_event_queue, &rdata->event_work);
375 * fc_rport_timeout() - Handler for the retry_work timer.
376 * @work: The work struct of the fc_rport_libfc_priv
378 * Locking Note: Called without the rport lock held. This
379 * function will hold the rport lock, call an _enter_*
380 * function and then unlock the rport.
382 static void fc_rport_timeout(struct work_struct *work)
384 struct fc_rport_libfc_priv *rdata =
385 container_of(work, struct fc_rport_libfc_priv, retry_work.work);
386 struct fc_rport *rport = PRIV_TO_RPORT(rdata);
388 mutex_lock(&rdata->rp_mutex);
390 switch (rdata->rp_state) {
392 fc_rport_enter_plogi(rport);
395 fc_rport_enter_prli(rport);
398 fc_rport_enter_rtv(rport);
401 fc_rport_enter_logo(rport);
409 mutex_unlock(&rdata->rp_mutex);
410 put_device(&rport->dev);
414 * fc_rport_error() - Error handler, called once retries have been exhausted
415 * @rport: The fc_rport object
416 * @fp: The frame pointer
418 * Locking Note: The rport lock is expected to be held before
419 * calling this routine
421 static void fc_rport_error(struct fc_rport *rport, struct fc_frame *fp)
423 struct fc_rport_libfc_priv *rdata = rport->dd_data;
425 FC_DEBUG_RPORT("Error %ld in state %s, retries %d\n",
426 PTR_ERR(fp), fc_rport_state(rport), rdata->retries);
428 switch (rdata->rp_state) {
432 rdata->event = RPORT_EV_FAILED;
433 queue_work(rport_event_queue,
437 fc_rport_enter_ready(rport);
447 * fc_rport_error_retry() - Error handler when retries are desired
448 * @rport: The fc_rport object
449 * @fp: The frame pointer
451 * If the error was an exchange timeout retry immediately,
452 * otherwise wait for E_D_TOV.
454 * Locking Note: The rport lock is expected to be held before
455 * calling this routine
457 static void fc_rport_error_retry(struct fc_rport *rport, struct fc_frame *fp)
459 struct fc_rport_libfc_priv *rdata = rport->dd_data;
460 unsigned long delay = FC_DEF_E_D_TOV;
462 /* make sure this isn't an FC_EX_CLOSED error, never retry those */
463 if (PTR_ERR(fp) == -FC_EX_CLOSED)
464 return fc_rport_error(rport, fp);
466 if (rdata->retries < rdata->local_port->max_retry_count) {
467 FC_DEBUG_RPORT("Error %ld in state %s, retrying\n",
468 PTR_ERR(fp), fc_rport_state(rport));
470 /* no additional delay on exchange timeouts */
471 if (PTR_ERR(fp) == -FC_EX_TIMEOUT)
473 get_device(&rport->dev);
474 schedule_delayed_work(&rdata->retry_work, delay);
478 return fc_rport_error(rport, fp);
482 * fc_rport_plogi_recv_resp() - Handle incoming ELS PLOGI response
483 * @sp: current sequence in the PLOGI exchange
484 * @fp: response frame
485 * @rp_arg: Fibre Channel remote port
487 * Locking Note: This function will be called without the rport lock
488 * held, but it will lock, call an _enter_* function or fc_rport_error
489 * and then unlock the rport.
491 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
494 struct fc_rport *rport = rp_arg;
495 struct fc_rport_libfc_priv *rdata = rport->dd_data;
496 struct fc_lport *lport = rdata->local_port;
497 struct fc_els_flogi *plp;
503 mutex_lock(&rdata->rp_mutex);
505 FC_DEBUG_RPORT("Received a PLOGI response from port (%6x)\n",
509 fc_rport_error_retry(rport, fp);
513 if (rdata->rp_state != RPORT_ST_PLOGI) {
514 FC_DBG("Received a PLOGI response, but in state %s\n",
515 fc_rport_state(rport));
519 op = fc_frame_payload_op(fp);
520 if (op == ELS_LS_ACC &&
521 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
522 rport->port_name = get_unaligned_be64(&plp->fl_wwpn);
523 rport->node_name = get_unaligned_be64(&plp->fl_wwnn);
525 tov = ntohl(plp->fl_csp.sp_e_d_tov);
526 if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR)
528 if (tov > rdata->e_d_tov)
529 rdata->e_d_tov = tov;
530 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
531 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
532 if (cssp_seq < csp_seq)
534 rdata->max_seq = csp_seq;
535 rport->maxframe_size =
536 fc_plogi_get_maxframe(plp, lport->mfs);
539 * If the rport is one of the well known addresses
540 * we skip PRLI and RTV and go straight to READY.
542 if (rport->port_id >= FC_FID_DOM_MGR)
543 fc_rport_enter_ready(rport);
545 fc_rport_enter_prli(rport);
547 fc_rport_error_retry(rport, fp);
552 mutex_unlock(&rdata->rp_mutex);
553 put_device(&rport->dev);
557 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request to peer
558 * @rport: Fibre Channel remote port to send PLOGI to
560 * Locking Note: The rport lock is expected to be held before calling
563 static void fc_rport_enter_plogi(struct fc_rport *rport)
565 struct fc_rport_libfc_priv *rdata = rport->dd_data;
566 struct fc_lport *lport = rdata->local_port;
569 FC_DEBUG_RPORT("Port (%6x) entered PLOGI state from %s state\n",
570 rport->port_id, fc_rport_state(rport));
572 fc_rport_state_enter(rport, RPORT_ST_PLOGI);
574 rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
575 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
577 fc_rport_error_retry(rport, fp);
580 rdata->e_d_tov = lport->e_d_tov;
582 if (!lport->tt.elsct_send(lport, rport, fp, ELS_PLOGI,
583 fc_rport_plogi_resp, rport, lport->e_d_tov))
584 fc_rport_error_retry(rport, fp);
586 get_device(&rport->dev);
590 * fc_rport_prli_resp() - Process Login (PRLI) response handler
591 * @sp: current sequence in the PRLI exchange
592 * @fp: response frame
593 * @rp_arg: Fibre Channel remote port
595 * Locking Note: This function will be called without the rport lock
596 * held, but it will lock, call an _enter_* function or fc_rport_error
597 * and then unlock the rport.
599 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
602 struct fc_rport *rport = rp_arg;
603 struct fc_rport_libfc_priv *rdata = rport->dd_data;
605 struct fc_els_prli prli;
606 struct fc_els_spp spp;
608 u32 roles = FC_RPORT_ROLE_UNKNOWN;
612 mutex_lock(&rdata->rp_mutex);
614 FC_DEBUG_RPORT("Received a PRLI response from port (%6x)\n",
618 fc_rport_error_retry(rport, fp);
622 if (rdata->rp_state != RPORT_ST_PRLI) {
623 FC_DBG("Received a PRLI response, but in state %s\n",
624 fc_rport_state(rport));
628 op = fc_frame_payload_op(fp);
629 if (op == ELS_LS_ACC) {
630 pp = fc_frame_payload_get(fp, sizeof(*pp));
631 if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
632 fcp_parm = ntohl(pp->spp.spp_params);
633 if (fcp_parm & FCP_SPPF_RETRY)
634 rdata->flags |= FC_RP_FLAGS_RETRY;
637 rport->supported_classes = FC_COS_CLASS3;
638 if (fcp_parm & FCP_SPPF_INIT_FCN)
639 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
640 if (fcp_parm & FCP_SPPF_TARG_FCN)
641 roles |= FC_RPORT_ROLE_FCP_TARGET;
643 rport->roles = roles;
644 fc_rport_enter_rtv(rport);
647 FC_DBG("Bad ELS response\n");
648 rdata->event = RPORT_EV_FAILED;
649 queue_work(rport_event_queue, &rdata->event_work);
655 mutex_unlock(&rdata->rp_mutex);
656 put_device(&rport->dev);
660 * fc_rport_logo_resp() - Logout (LOGO) response handler
661 * @sp: current sequence in the LOGO exchange
662 * @fp: response frame
663 * @rp_arg: Fibre Channel remote port
665 * Locking Note: This function will be called without the rport lock
666 * held, but it will lock, call an _enter_* function or fc_rport_error
667 * and then unlock the rport.
669 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
672 struct fc_rport *rport = rp_arg;
673 struct fc_rport_libfc_priv *rdata = rport->dd_data;
676 mutex_lock(&rdata->rp_mutex);
678 FC_DEBUG_RPORT("Received a LOGO response from port (%6x)\n",
682 fc_rport_error_retry(rport, fp);
686 if (rdata->rp_state != RPORT_ST_LOGO) {
687 FC_DEBUG_RPORT("Received a LOGO response, but in state %s\n",
688 fc_rport_state(rport));
692 op = fc_frame_payload_op(fp);
693 if (op == ELS_LS_ACC) {
694 fc_rport_enter_rtv(rport);
696 FC_DBG("Bad ELS response\n");
697 rdata->event = RPORT_EV_LOGO;
698 queue_work(rport_event_queue, &rdata->event_work);
704 mutex_unlock(&rdata->rp_mutex);
705 put_device(&rport->dev);
709 * fc_rport_enter_prli() - Send Process Login (PRLI) request to peer
710 * @rport: Fibre Channel remote port to send PRLI to
712 * Locking Note: The rport lock is expected to be held before calling
715 static void fc_rport_enter_prli(struct fc_rport *rport)
717 struct fc_rport_libfc_priv *rdata = rport->dd_data;
718 struct fc_lport *lport = rdata->local_port;
720 struct fc_els_prli prli;
721 struct fc_els_spp spp;
725 FC_DEBUG_RPORT("Port (%6x) entered PRLI state from %s state\n",
726 rport->port_id, fc_rport_state(rport));
728 fc_rport_state_enter(rport, RPORT_ST_PRLI);
730 fp = fc_frame_alloc(lport, sizeof(*pp));
732 fc_rport_error_retry(rport, fp);
736 if (!lport->tt.elsct_send(lport, rport, fp, ELS_PRLI,
737 fc_rport_prli_resp, rport, lport->e_d_tov))
738 fc_rport_error_retry(rport, fp);
740 get_device(&rport->dev);
744 * fc_rport_els_rtv_resp() - Request Timeout Value response handler
745 * @sp: current sequence in the RTV exchange
746 * @fp: response frame
747 * @rp_arg: Fibre Channel remote port
749 * Many targets don't seem to support this.
751 * Locking Note: This function will be called without the rport lock
752 * held, but it will lock, call an _enter_* function or fc_rport_error
753 * and then unlock the rport.
755 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
758 struct fc_rport *rport = rp_arg;
759 struct fc_rport_libfc_priv *rdata = rport->dd_data;
762 mutex_lock(&rdata->rp_mutex);
764 FC_DEBUG_RPORT("Received a RTV response from port (%6x)\n",
768 fc_rport_error(rport, fp);
772 if (rdata->rp_state != RPORT_ST_RTV) {
773 FC_DBG("Received a RTV response, but in state %s\n",
774 fc_rport_state(rport));
778 op = fc_frame_payload_op(fp);
779 if (op == ELS_LS_ACC) {
780 struct fc_els_rtv_acc *rtv;
784 rtv = fc_frame_payload_get(fp, sizeof(*rtv));
786 toq = ntohl(rtv->rtv_toq);
787 tov = ntohl(rtv->rtv_r_a_tov);
790 rdata->r_a_tov = tov;
791 tov = ntohl(rtv->rtv_e_d_tov);
792 if (toq & FC_ELS_RTV_EDRES)
796 rdata->e_d_tov = tov;
800 fc_rport_enter_ready(rport);
805 mutex_unlock(&rdata->rp_mutex);
806 put_device(&rport->dev);
810 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request to peer
811 * @rport: Fibre Channel remote port to send RTV to
813 * Locking Note: The rport lock is expected to be held before calling
816 static void fc_rport_enter_rtv(struct fc_rport *rport)
819 struct fc_rport_libfc_priv *rdata = rport->dd_data;
820 struct fc_lport *lport = rdata->local_port;
822 FC_DEBUG_RPORT("Port (%6x) entered RTV state from %s state\n",
823 rport->port_id, fc_rport_state(rport));
825 fc_rport_state_enter(rport, RPORT_ST_RTV);
827 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
829 fc_rport_error_retry(rport, fp);
833 if (!lport->tt.elsct_send(lport, rport, fp, ELS_RTV,
834 fc_rport_rtv_resp, rport, lport->e_d_tov))
835 fc_rport_error_retry(rport, fp);
837 get_device(&rport->dev);
841 * fc_rport_enter_logo() - Send Logout (LOGO) request to peer
842 * @rport: Fibre Channel remote port to send LOGO to
844 * Locking Note: The rport lock is expected to be held before calling
847 static void fc_rport_enter_logo(struct fc_rport *rport)
849 struct fc_rport_libfc_priv *rdata = rport->dd_data;
850 struct fc_lport *lport = rdata->local_port;
853 FC_DEBUG_RPORT("Port (%6x) entered LOGO state from %s state\n",
854 rport->port_id, fc_rport_state(rport));
856 fc_rport_state_enter(rport, RPORT_ST_LOGO);
858 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
860 fc_rport_error_retry(rport, fp);
864 if (!lport->tt.elsct_send(lport, rport, fp, ELS_LOGO,
865 fc_rport_logo_resp, rport, lport->e_d_tov))
866 fc_rport_error_retry(rport, fp);
868 get_device(&rport->dev);
873 * fc_rport_recv_req() - Receive a request from a rport
874 * @sp: current sequence in the PLOGI exchange
875 * @fp: response frame
876 * @rp_arg: Fibre Channel remote port
878 * Locking Note: Called without the rport lock held. This
879 * function will hold the rport lock, call an _enter_*
880 * function and then unlock the rport.
882 void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
883 struct fc_rport *rport)
885 struct fc_rport_libfc_priv *rdata = rport->dd_data;
886 struct fc_lport *lport = rdata->local_port;
888 struct fc_frame_header *fh;
889 struct fc_seq_els_data els_data;
892 mutex_lock(&rdata->rp_mutex);
895 els_data.explan = ELS_EXPL_NONE;
896 els_data.reason = ELS_RJT_NONE;
898 fh = fc_frame_header_get(fp);
900 if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) {
901 op = fc_frame_payload_op(fp);
904 fc_rport_recv_plogi_req(rport, sp, fp);
907 fc_rport_recv_prli_req(rport, sp, fp);
910 fc_rport_recv_prlo_req(rport, sp, fp);
913 fc_rport_recv_logo_req(rport, sp, fp);
917 lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data);
921 lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
924 els_data.reason = ELS_RJT_UNSUP;
925 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
930 mutex_unlock(&rdata->rp_mutex);
934 * fc_rport_recv_plogi_req() - Handle incoming Port Login (PLOGI) request
935 * @rport: Fibre Channel remote port that initiated PLOGI
936 * @sp: current sequence in the PLOGI exchange
937 * @fp: PLOGI request frame
939 * Locking Note: The rport lock is exected to be held before calling
942 static void fc_rport_recv_plogi_req(struct fc_rport *rport,
943 struct fc_seq *sp, struct fc_frame *rx_fp)
945 struct fc_rport_libfc_priv *rdata = rport->dd_data;
946 struct fc_lport *lport = rdata->local_port;
947 struct fc_frame *fp = rx_fp;
949 struct fc_frame_header *fh;
950 struct fc_els_flogi *pl;
951 struct fc_seq_els_data rjt_data;
955 enum fc_els_rjt_reason reject = 0;
959 fh = fc_frame_header_get(fp);
961 FC_DEBUG_RPORT("Received PLOGI request from port (%6x) "
962 "while in state %s\n", ntoh24(fh->fh_s_id),
963 fc_rport_state(rport));
965 sid = ntoh24(fh->fh_s_id);
966 pl = fc_frame_payload_get(fp, sizeof(*pl));
968 FC_DBG("incoming PLOGI from %x too short\n", sid);
970 /* XXX TBD: send reject? */
974 wwpn = get_unaligned_be64(&pl->fl_wwpn);
975 wwnn = get_unaligned_be64(&pl->fl_wwnn);
978 * If the session was just created, possibly due to the incoming PLOGI,
979 * set the state appropriately and accept the PLOGI.
981 * If we had also sent a PLOGI, and if the received PLOGI is from a
982 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
983 * "command already in progress".
985 * XXX TBD: If the session was ready before, the PLOGI should result in
986 * all outstanding exchanges being reset.
988 switch (rdata->rp_state) {
990 FC_DEBUG_RPORT("incoming PLOGI from %6x wwpn %llx state INIT "
991 "- reject\n", sid, (unsigned long long)wwpn);
992 reject = ELS_RJT_UNSUP;
995 FC_DEBUG_RPORT("incoming PLOGI from %x in PLOGI state %d\n",
996 sid, rdata->rp_state);
997 if (wwpn < lport->wwpn)
998 reject = ELS_RJT_INPROG;
1001 case RPORT_ST_READY:
1002 FC_DEBUG_RPORT("incoming PLOGI from %x in logged-in state %d "
1003 "- ignored for now\n", sid, rdata->rp_state);
1004 /* XXX TBD - should reset */
1008 FC_DEBUG_RPORT("incoming PLOGI from %x in unexpected "
1009 "state %d\n", sid, rdata->rp_state);
1014 rjt_data.reason = reject;
1015 rjt_data.explan = ELS_EXPL_NONE;
1016 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1019 fp = fc_frame_alloc(lport, sizeof(*pl));
1022 rjt_data.reason = ELS_RJT_UNAB;
1023 rjt_data.explan = ELS_EXPL_NONE;
1024 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1027 sp = lport->tt.seq_start_next(sp);
1029 fc_rport_set_name(rport, wwpn, wwnn);
1032 * Get session payload size from incoming PLOGI.
1034 rport->maxframe_size =
1035 fc_plogi_get_maxframe(pl, lport->mfs);
1036 fc_frame_free(rx_fp);
1037 fc_plogi_fill(lport, fp, ELS_LS_ACC);
1040 * Send LS_ACC. If this fails,
1041 * the originator should retry.
1043 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
1044 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1045 ep = fc_seq_exch(sp);
1046 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
1047 FC_TYPE_ELS, f_ctl, 0);
1048 lport->tt.seq_send(lport, sp, fp);
1049 if (rdata->rp_state == RPORT_ST_PLOGI)
1050 fc_rport_enter_prli(rport);
1056 * fc_rport_recv_prli_req() - Handle incoming Process Login (PRLI) request
1057 * @rport: Fibre Channel remote port that initiated PRLI
1058 * @sp: current sequence in the PRLI exchange
1059 * @fp: PRLI request frame
1061 * Locking Note: The rport lock is exected to be held before calling
1064 static void fc_rport_recv_prli_req(struct fc_rport *rport,
1065 struct fc_seq *sp, struct fc_frame *rx_fp)
1067 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1068 struct fc_lport *lport = rdata->local_port;
1070 struct fc_frame *fp;
1071 struct fc_frame_header *fh;
1073 struct fc_els_prli prli;
1074 struct fc_els_spp spp;
1076 struct fc_els_spp *rspp; /* request service param page */
1077 struct fc_els_spp *spp; /* response spp */
1080 enum fc_els_rjt_reason reason = ELS_RJT_UNAB;
1081 enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
1082 enum fc_els_spp_resp resp;
1083 struct fc_seq_els_data rjt_data;
1086 u32 roles = FC_RPORT_ROLE_UNKNOWN;
1089 fh = fc_frame_header_get(rx_fp);
1091 FC_DEBUG_RPORT("Received PRLI request from port (%6x) "
1092 "while in state %s\n", ntoh24(fh->fh_s_id),
1093 fc_rport_state(rport));
1095 switch (rdata->rp_state) {
1097 case RPORT_ST_READY:
1098 reason = ELS_RJT_NONE;
1103 len = fr_len(rx_fp) - sizeof(*fh);
1104 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1106 reason = ELS_RJT_PROT;
1107 explan = ELS_EXPL_INV_LEN;
1109 plen = ntohs(pp->prli.prli_len);
1110 if ((plen % 4) != 0 || plen > len) {
1111 reason = ELS_RJT_PROT;
1112 explan = ELS_EXPL_INV_LEN;
1113 } else if (plen < len) {
1116 plen = pp->prli.prli_spp_len;
1117 if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1118 plen > len || len < sizeof(*pp)) {
1119 reason = ELS_RJT_PROT;
1120 explan = ELS_EXPL_INV_LEN;
1124 if (reason != ELS_RJT_NONE ||
1125 (fp = fc_frame_alloc(lport, len)) == NULL) {
1126 rjt_data.reason = reason;
1127 rjt_data.explan = explan;
1128 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1130 sp = lport->tt.seq_start_next(sp);
1132 pp = fc_frame_payload_get(fp, len);
1135 pp->prli.prli_cmd = ELS_LS_ACC;
1136 pp->prli.prli_spp_len = plen;
1137 pp->prli.prli_len = htons(len);
1138 len -= sizeof(struct fc_els_prli);
1141 * Go through all the service parameter pages and build
1142 * response. If plen indicates longer SPP than standard,
1143 * use that. The entire response has been pre-cleared above.
1146 while (len >= plen) {
1147 spp->spp_type = rspp->spp_type;
1148 spp->spp_type_ext = rspp->spp_type_ext;
1149 spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
1150 resp = FC_SPP_RESP_ACK;
1151 if (rspp->spp_flags & FC_SPP_RPA_VAL)
1152 resp = FC_SPP_RESP_NO_PA;
1153 switch (rspp->spp_type) {
1154 case 0: /* common to all FC-4 types */
1157 fcp_parm = ntohl(rspp->spp_params);
1158 if (fcp_parm * FCP_SPPF_RETRY)
1159 rdata->flags |= FC_RP_FLAGS_RETRY;
1160 rport->supported_classes = FC_COS_CLASS3;
1161 if (fcp_parm & FCP_SPPF_INIT_FCN)
1162 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1163 if (fcp_parm & FCP_SPPF_TARG_FCN)
1164 roles |= FC_RPORT_ROLE_FCP_TARGET;
1165 rport->roles = roles;
1168 htonl(lport->service_params);
1171 resp = FC_SPP_RESP_INVL;
1174 spp->spp_flags |= resp;
1176 rspp = (struct fc_els_spp *)((char *)rspp + plen);
1177 spp = (struct fc_els_spp *)((char *)spp + plen);
1181 * Send LS_ACC. If this fails, the originator should retry.
1183 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
1184 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1185 ep = fc_seq_exch(sp);
1186 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
1187 FC_TYPE_ELS, f_ctl, 0);
1188 lport->tt.seq_send(lport, sp, fp);
1191 * Get lock and re-check state.
1193 switch (rdata->rp_state) {
1195 fc_rport_enter_ready(rport);
1197 case RPORT_ST_READY:
1203 fc_frame_free(rx_fp);
1207 * fc_rport_recv_prlo_req() - Handle incoming Process Logout (PRLO) request
1208 * @rport: Fibre Channel remote port that initiated PRLO
1209 * @sp: current sequence in the PRLO exchange
1210 * @fp: PRLO request frame
1212 * Locking Note: The rport lock is exected to be held before calling
1215 static void fc_rport_recv_prlo_req(struct fc_rport *rport, struct fc_seq *sp,
1216 struct fc_frame *fp)
1218 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1219 struct fc_lport *lport = rdata->local_port;
1221 struct fc_frame_header *fh;
1222 struct fc_seq_els_data rjt_data;
1224 fh = fc_frame_header_get(fp);
1226 FC_DEBUG_RPORT("Received PRLO request from port (%6x) "
1227 "while in state %s\n", ntoh24(fh->fh_s_id),
1228 fc_rport_state(rport));
1231 rjt_data.reason = ELS_RJT_UNAB;
1232 rjt_data.explan = ELS_EXPL_NONE;
1233 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1238 * fc_rport_recv_logo_req() - Handle incoming Logout (LOGO) request
1239 * @rport: Fibre Channel remote port that initiated LOGO
1240 * @sp: current sequence in the LOGO exchange
1241 * @fp: LOGO request frame
1243 * Locking Note: The rport lock is exected to be held before calling
1246 static void fc_rport_recv_logo_req(struct fc_rport *rport, struct fc_seq *sp,
1247 struct fc_frame *fp)
1249 struct fc_frame_header *fh;
1250 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1251 struct fc_lport *lport = rdata->local_port;
1253 fh = fc_frame_header_get(fp);
1255 FC_DEBUG_RPORT("Received LOGO request from port (%6x) "
1256 "while in state %s\n", ntoh24(fh->fh_s_id),
1257 fc_rport_state(rport));
1259 rdata->event = RPORT_EV_LOGO;
1260 queue_work(rport_event_queue, &rdata->event_work);
1262 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
1266 static void fc_rport_flush_queue(void)
1268 flush_workqueue(rport_event_queue);
1272 int fc_rport_init(struct fc_lport *lport)
1274 if (!lport->tt.rport_create)
1275 lport->tt.rport_create = fc_rport_rogue_create;
1277 if (!lport->tt.rport_login)
1278 lport->tt.rport_login = fc_rport_login;
1280 if (!lport->tt.rport_logoff)
1281 lport->tt.rport_logoff = fc_rport_logoff;
1283 if (!lport->tt.rport_recv_req)
1284 lport->tt.rport_recv_req = fc_rport_recv_req;
1286 if (!lport->tt.rport_flush_queue)
1287 lport->tt.rport_flush_queue = fc_rport_flush_queue;
1291 EXPORT_SYMBOL(fc_rport_init);
1293 int fc_setup_rport()
1295 rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
1296 if (!rport_event_queue)
1300 EXPORT_SYMBOL(fc_setup_rport);
1302 void fc_destroy_rport()
1304 destroy_workqueue(rport_event_queue);
1306 EXPORT_SYMBOL(fc_destroy_rport);
1308 void fc_rport_terminate_io(struct fc_rport *rport)
1310 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1311 struct fc_lport *lport = rdata->local_port;
1313 lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
1314 lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
1316 EXPORT_SYMBOL(fc_rport_terminate_io);