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 struct workqueue_struct *rport_event_queue;
60 static void fc_rport_enter_plogi(struct fc_rport_priv *);
61 static void fc_rport_enter_prli(struct fc_rport_priv *);
62 static void fc_rport_enter_rtv(struct fc_rport_priv *);
63 static void fc_rport_enter_ready(struct fc_rport_priv *);
64 static void fc_rport_enter_logo(struct fc_rport_priv *);
65 static void fc_rport_enter_adisc(struct fc_rport_priv *);
67 static void fc_rport_recv_plogi_req(struct fc_lport *,
68 struct fc_seq *, struct fc_frame *);
69 static void fc_rport_recv_prli_req(struct fc_rport_priv *,
70 struct fc_seq *, struct fc_frame *);
71 static void fc_rport_recv_prlo_req(struct fc_rport_priv *,
72 struct fc_seq *, struct fc_frame *);
73 static void fc_rport_recv_logo_req(struct fc_lport *,
74 struct fc_seq *, struct fc_frame *);
75 static void fc_rport_timeout(struct work_struct *);
76 static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *);
77 static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *);
78 static void fc_rport_work(struct work_struct *);
80 static const char *fc_rport_state_names[] = {
81 [RPORT_ST_INIT] = "Init",
82 [RPORT_ST_PLOGI] = "PLOGI",
83 [RPORT_ST_PRLI] = "PRLI",
84 [RPORT_ST_RTV] = "RTV",
85 [RPORT_ST_READY] = "Ready",
86 [RPORT_ST_LOGO] = "LOGO",
87 [RPORT_ST_ADISC] = "ADISC",
88 [RPORT_ST_DELETE] = "Delete",
92 * fc_rport_lookup() - lookup a remote port by port_id
93 * @lport: Fibre Channel host port instance
94 * @port_id: remote port port_id to match
96 static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
99 struct fc_rport_priv *rdata;
101 list_for_each_entry(rdata, &lport->disc.rports, peers)
102 if (rdata->ids.port_id == port_id &&
103 rdata->rp_state != RPORT_ST_DELETE)
109 * fc_rport_create() - Create a new remote port
110 * @lport: The local port that the new remote port is for
111 * @port_id: The port ID for the new remote port
113 * Locking note: must be called with the disc_mutex held.
115 static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
118 struct fc_rport_priv *rdata;
120 rdata = lport->tt.rport_lookup(lport, port_id);
124 rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);
128 rdata->ids.node_name = -1;
129 rdata->ids.port_name = -1;
130 rdata->ids.port_id = port_id;
131 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
133 kref_init(&rdata->kref);
134 mutex_init(&rdata->rp_mutex);
135 rdata->local_port = lport;
136 rdata->rp_state = RPORT_ST_INIT;
137 rdata->event = RPORT_EV_NONE;
138 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
139 rdata->e_d_tov = lport->e_d_tov;
140 rdata->r_a_tov = lport->r_a_tov;
141 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
142 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
143 INIT_WORK(&rdata->event_work, fc_rport_work);
144 if (port_id != FC_FID_DIR_SERV)
145 list_add(&rdata->peers, &lport->disc.rports);
150 * fc_rport_destroy() - free a remote port after last reference is released.
151 * @kref: pointer to kref inside struct fc_rport_priv
153 static void fc_rport_destroy(struct kref *kref)
155 struct fc_rport_priv *rdata;
157 rdata = container_of(kref, struct fc_rport_priv, kref);
162 * fc_rport_state() - return a string for the state the rport is in
163 * @rdata: remote port private data
165 static const char *fc_rport_state(struct fc_rport_priv *rdata)
169 cp = fc_rport_state_names[rdata->rp_state];
176 * fc_set_rport_loss_tmo() - Set the remote port loss timeout in seconds.
177 * @rport: Pointer to Fibre Channel remote port structure
178 * @timeout: timeout in seconds
180 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
183 rport->dev_loss_tmo = timeout + 5;
185 rport->dev_loss_tmo = 30;
187 EXPORT_SYMBOL(fc_set_rport_loss_tmo);
190 * fc_plogi_get_maxframe() - Get max payload from the common service parameters
191 * @flp: FLOGI payload structure
192 * @maxval: upper limit, may be less than what is in the service parameters
194 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
200 * Get max payload from the common service parameters and the
201 * class 3 receive data field size.
203 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
204 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
206 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
207 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
213 * fc_rport_state_enter() - Change the rport's state
214 * @rdata: The rport whose state should change
215 * @new: The new state of the rport
217 * Locking Note: Called with the rport lock held
219 static void fc_rport_state_enter(struct fc_rport_priv *rdata,
220 enum fc_rport_state new)
222 if (rdata->rp_state != new)
224 rdata->rp_state = new;
227 static void fc_rport_work(struct work_struct *work)
230 struct fc_rport_priv *rdata =
231 container_of(work, struct fc_rport_priv, event_work);
232 struct fc_rport_libfc_priv *rp;
233 enum fc_rport_event event;
234 struct fc_lport *lport = rdata->local_port;
235 struct fc_rport_operations *rport_ops;
236 struct fc_rport_identifiers ids;
237 struct fc_rport *rport;
239 mutex_lock(&rdata->rp_mutex);
240 event = rdata->event;
241 rport_ops = rdata->ops;
242 rport = rdata->rport;
244 FC_RPORT_DBG(rdata, "work event %u\n", event);
249 rdata->event = RPORT_EV_NONE;
250 kref_get(&rdata->kref);
251 mutex_unlock(&rdata->rp_mutex);
254 rport = fc_remote_port_add(lport->host, 0, &ids);
256 FC_RPORT_DBG(rdata, "Failed to add the rport\n");
257 lport->tt.rport_logoff(rdata);
258 kref_put(&rdata->kref, lport->tt.rport_destroy);
261 mutex_lock(&rdata->rp_mutex);
263 FC_RPORT_DBG(rdata, "rport already allocated\n");
264 rdata->rport = rport;
265 rport->maxframe_size = rdata->maxframe_size;
266 rport->supported_classes = rdata->supported_classes;
269 rp->local_port = lport;
270 rp->rp_state = rdata->rp_state;
271 rp->flags = rdata->flags;
272 rp->e_d_tov = rdata->e_d_tov;
273 rp->r_a_tov = rdata->r_a_tov;
274 mutex_unlock(&rdata->rp_mutex);
276 if (rport_ops && rport_ops->event_callback) {
277 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
278 rport_ops->event_callback(lport, rdata, event);
280 kref_put(&rdata->kref, lport->tt.rport_destroy);
283 case RPORT_EV_FAILED:
286 port_id = rdata->ids.port_id;
287 mutex_unlock(&rdata->rp_mutex);
289 if (port_id != FC_FID_DIR_SERV) {
290 mutex_lock(&lport->disc.disc_mutex);
291 list_del(&rdata->peers);
292 mutex_unlock(&lport->disc.disc_mutex);
295 if (rport_ops && rport_ops->event_callback) {
296 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
297 rport_ops->event_callback(lport, rdata, event);
299 cancel_delayed_work_sync(&rdata->retry_work);
302 * Reset any outstanding exchanges before freeing rport.
304 lport->tt.exch_mgr_reset(lport, 0, port_id);
305 lport->tt.exch_mgr_reset(lport, port_id, 0);
309 rp->rp_state = RPORT_ST_DELETE;
310 mutex_lock(&rdata->rp_mutex);
312 mutex_unlock(&rdata->rp_mutex);
313 fc_remote_port_delete(rport);
315 kref_put(&rdata->kref, lport->tt.rport_destroy);
319 mutex_unlock(&rdata->rp_mutex);
325 * fc_rport_login() - Start the remote port login state machine
326 * @rdata: private remote port
328 * Locking Note: Called without the rport lock held. This
329 * function will hold the rport lock, call an _enter_*
330 * function and then unlock the rport.
332 * This indicates the intent to be logged into the remote port.
333 * If it appears we are already logged in, ADISC is used to verify
336 int fc_rport_login(struct fc_rport_priv *rdata)
338 mutex_lock(&rdata->rp_mutex);
340 switch (rdata->rp_state) {
342 FC_RPORT_DBG(rdata, "ADISC port\n");
343 fc_rport_enter_adisc(rdata);
346 FC_RPORT_DBG(rdata, "Login to port\n");
347 fc_rport_enter_plogi(rdata);
350 mutex_unlock(&rdata->rp_mutex);
356 * fc_rport_enter_delete() - schedule a remote port to be deleted.
357 * @rdata: private remote port
358 * @event: event to report as the reason for deletion
360 * Locking Note: Called with the rport lock held.
362 * Allow state change into DELETE only once.
364 * Call queue_work only if there's no event already pending.
365 * Set the new event so that the old pending event will not occur.
366 * Since we have the mutex, even if fc_rport_work() is already started,
367 * it'll see the new event.
369 static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
370 enum fc_rport_event event)
372 if (rdata->rp_state == RPORT_ST_DELETE)
375 FC_RPORT_DBG(rdata, "Delete port\n");
377 fc_rport_state_enter(rdata, RPORT_ST_DELETE);
379 if (rdata->event == RPORT_EV_NONE)
380 queue_work(rport_event_queue, &rdata->event_work);
381 rdata->event = event;
385 * fc_rport_logoff() - Logoff and remove an rport
386 * @rdata: private remote port
388 * Locking Note: Called without the rport lock held. This
389 * function will hold the rport lock, call an _enter_*
390 * function and then unlock the rport.
392 int fc_rport_logoff(struct fc_rport_priv *rdata)
394 mutex_lock(&rdata->rp_mutex);
396 FC_RPORT_DBG(rdata, "Remove port\n");
398 if (rdata->rp_state == RPORT_ST_DELETE) {
399 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
400 mutex_unlock(&rdata->rp_mutex);
404 fc_rport_enter_logo(rdata);
407 * Change the state to Delete so that we discard
410 fc_rport_enter_delete(rdata, RPORT_EV_STOP);
411 mutex_unlock(&rdata->rp_mutex);
418 * fc_rport_enter_ready() - The rport is ready
419 * @rdata: private remote port
421 * Locking Note: The rport lock is expected to be held before calling
424 static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
426 fc_rport_state_enter(rdata, RPORT_ST_READY);
428 FC_RPORT_DBG(rdata, "Port is Ready\n");
430 if (rdata->event == RPORT_EV_NONE)
431 queue_work(rport_event_queue, &rdata->event_work);
432 rdata->event = RPORT_EV_READY;
436 * fc_rport_timeout() - Handler for the retry_work timer.
437 * @work: The work struct of the fc_rport_priv
439 * Locking Note: Called without the rport lock held. This
440 * function will hold the rport lock, call an _enter_*
441 * function and then unlock the rport.
443 static void fc_rport_timeout(struct work_struct *work)
445 struct fc_rport_priv *rdata =
446 container_of(work, struct fc_rport_priv, retry_work.work);
448 mutex_lock(&rdata->rp_mutex);
450 switch (rdata->rp_state) {
452 fc_rport_enter_plogi(rdata);
455 fc_rport_enter_prli(rdata);
458 fc_rport_enter_rtv(rdata);
461 fc_rport_enter_logo(rdata);
464 fc_rport_enter_adisc(rdata);
468 case RPORT_ST_DELETE:
472 mutex_unlock(&rdata->rp_mutex);
476 * fc_rport_error() - Error handler, called once retries have been exhausted
477 * @rdata: private remote port
478 * @fp: The frame pointer
480 * Locking Note: The rport lock is expected to be held before
481 * calling this routine
483 static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp)
485 FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n",
486 IS_ERR(fp) ? -PTR_ERR(fp) : 0,
487 fc_rport_state(rdata), rdata->retries);
489 switch (rdata->rp_state) {
492 fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
495 fc_rport_enter_ready(rdata);
499 fc_rport_enter_logo(rdata);
501 case RPORT_ST_DELETE:
509 * fc_rport_error_retry() - Error handler when retries are desired
510 * @rdata: private remote port data
511 * @fp: The frame pointer
513 * If the error was an exchange timeout retry immediately,
514 * otherwise wait for E_D_TOV.
516 * Locking Note: The rport lock is expected to be held before
517 * calling this routine
519 static void fc_rport_error_retry(struct fc_rport_priv *rdata,
522 unsigned long delay = FC_DEF_E_D_TOV;
524 /* make sure this isn't an FC_EX_CLOSED error, never retry those */
525 if (PTR_ERR(fp) == -FC_EX_CLOSED)
526 return fc_rport_error(rdata, fp);
528 if (rdata->retries < rdata->local_port->max_rport_retry_count) {
529 FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n",
530 PTR_ERR(fp), fc_rport_state(rdata));
532 /* no additional delay on exchange timeouts */
533 if (PTR_ERR(fp) == -FC_EX_TIMEOUT)
535 schedule_delayed_work(&rdata->retry_work, delay);
539 return fc_rport_error(rdata, fp);
543 * fc_rport_plogi_recv_resp() - Handle incoming ELS PLOGI response
544 * @sp: current sequence in the PLOGI exchange
545 * @fp: response frame
546 * @rdata_arg: private remote port data
548 * Locking Note: This function will be called without the rport lock
549 * held, but it will lock, call an _enter_* function or fc_rport_error
550 * and then unlock the rport.
552 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
555 struct fc_rport_priv *rdata = rdata_arg;
556 struct fc_lport *lport = rdata->local_port;
557 struct fc_els_flogi *plp = NULL;
563 mutex_lock(&rdata->rp_mutex);
565 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
567 if (rdata->rp_state != RPORT_ST_PLOGI) {
568 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
569 "%s\n", fc_rport_state(rdata));
576 fc_rport_error_retry(rdata, fp);
580 op = fc_frame_payload_op(fp);
581 if (op == ELS_LS_ACC &&
582 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
583 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
584 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn);
586 tov = ntohl(plp->fl_csp.sp_e_d_tov);
587 if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR)
589 if (tov > rdata->e_d_tov)
590 rdata->e_d_tov = tov;
591 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
592 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
593 if (cssp_seq < csp_seq)
595 rdata->max_seq = csp_seq;
596 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs);
597 fc_rport_enter_prli(rdata);
599 fc_rport_error_retry(rdata, fp);
604 mutex_unlock(&rdata->rp_mutex);
605 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
609 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request to peer
610 * @rdata: private remote port data
612 * Locking Note: The rport lock is expected to be held before calling
615 static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
617 struct fc_lport *lport = rdata->local_port;
620 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
621 fc_rport_state(rdata));
623 fc_rport_state_enter(rdata, RPORT_ST_PLOGI);
625 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
626 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
628 fc_rport_error_retry(rdata, fp);
631 rdata->e_d_tov = lport->e_d_tov;
633 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
634 fc_rport_plogi_resp, rdata, lport->e_d_tov))
635 fc_rport_error_retry(rdata, fp);
637 kref_get(&rdata->kref);
641 * fc_rport_prli_resp() - Process Login (PRLI) response handler
642 * @sp: current sequence in the PRLI exchange
643 * @fp: response frame
644 * @rdata_arg: private remote port data
646 * Locking Note: This function will be called without the rport lock
647 * held, but it will lock, call an _enter_* function or fc_rport_error
648 * and then unlock the rport.
650 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
653 struct fc_rport_priv *rdata = rdata_arg;
655 struct fc_els_prli prli;
656 struct fc_els_spp spp;
658 u32 roles = FC_RPORT_ROLE_UNKNOWN;
662 mutex_lock(&rdata->rp_mutex);
664 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
666 if (rdata->rp_state != RPORT_ST_PRLI) {
667 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
668 "%s\n", fc_rport_state(rdata));
675 fc_rport_error_retry(rdata, fp);
679 /* reinitialize remote port roles */
680 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
682 op = fc_frame_payload_op(fp);
683 if (op == ELS_LS_ACC) {
684 pp = fc_frame_payload_get(fp, sizeof(*pp));
685 if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
686 fcp_parm = ntohl(pp->spp.spp_params);
687 if (fcp_parm & FCP_SPPF_RETRY)
688 rdata->flags |= FC_RP_FLAGS_RETRY;
691 rdata->supported_classes = FC_COS_CLASS3;
692 if (fcp_parm & FCP_SPPF_INIT_FCN)
693 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
694 if (fcp_parm & FCP_SPPF_TARG_FCN)
695 roles |= FC_RPORT_ROLE_FCP_TARGET;
697 rdata->ids.roles = roles;
698 fc_rport_enter_rtv(rdata);
701 FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n");
702 fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
708 mutex_unlock(&rdata->rp_mutex);
709 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
713 * fc_rport_logo_resp() - Logout (LOGO) response handler
714 * @sp: current sequence in the LOGO exchange
715 * @fp: response frame
716 * @rdata_arg: private remote port data
718 * Locking Note: This function will be called without the rport lock
719 * held, but it will lock, call an _enter_* function or fc_rport_error
720 * and then unlock the rport.
722 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
725 struct fc_rport_priv *rdata = rdata_arg;
728 mutex_lock(&rdata->rp_mutex);
730 FC_RPORT_DBG(rdata, "Received a LOGO %s\n", fc_els_resp_type(fp));
732 if (rdata->rp_state != RPORT_ST_LOGO) {
733 FC_RPORT_DBG(rdata, "Received a LOGO response, but in state "
734 "%s\n", fc_rport_state(rdata));
741 fc_rport_error_retry(rdata, fp);
745 op = fc_frame_payload_op(fp);
746 if (op != ELS_LS_ACC)
747 FC_RPORT_DBG(rdata, "Bad ELS response op %x for LOGO command\n",
749 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
754 mutex_unlock(&rdata->rp_mutex);
755 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
759 * fc_rport_enter_prli() - Send Process Login (PRLI) request to peer
760 * @rdata: private remote port data
762 * Locking Note: The rport lock is expected to be held before calling
765 static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
767 struct fc_lport *lport = rdata->local_port;
769 struct fc_els_prli prli;
770 struct fc_els_spp spp;
775 * If the rport is one of the well known addresses
776 * we skip PRLI and RTV and go straight to READY.
778 if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
779 fc_rport_enter_ready(rdata);
783 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
784 fc_rport_state(rdata));
786 fc_rport_state_enter(rdata, RPORT_ST_PRLI);
788 fp = fc_frame_alloc(lport, sizeof(*pp));
790 fc_rport_error_retry(rdata, fp);
794 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PRLI,
795 fc_rport_prli_resp, rdata, lport->e_d_tov))
796 fc_rport_error_retry(rdata, fp);
798 kref_get(&rdata->kref);
802 * fc_rport_els_rtv_resp() - Request Timeout Value response handler
803 * @sp: current sequence in the RTV exchange
804 * @fp: response frame
805 * @rdata_arg: private remote port data
807 * Many targets don't seem to support this.
809 * Locking Note: This function will be called without the rport lock
810 * held, but it will lock, call an _enter_* function or fc_rport_error
811 * and then unlock the rport.
813 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
816 struct fc_rport_priv *rdata = rdata_arg;
819 mutex_lock(&rdata->rp_mutex);
821 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
823 if (rdata->rp_state != RPORT_ST_RTV) {
824 FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
825 "%s\n", fc_rport_state(rdata));
832 fc_rport_error(rdata, fp);
836 op = fc_frame_payload_op(fp);
837 if (op == ELS_LS_ACC) {
838 struct fc_els_rtv_acc *rtv;
842 rtv = fc_frame_payload_get(fp, sizeof(*rtv));
844 toq = ntohl(rtv->rtv_toq);
845 tov = ntohl(rtv->rtv_r_a_tov);
848 rdata->r_a_tov = tov;
849 tov = ntohl(rtv->rtv_e_d_tov);
850 if (toq & FC_ELS_RTV_EDRES)
854 rdata->e_d_tov = tov;
858 fc_rport_enter_ready(rdata);
863 mutex_unlock(&rdata->rp_mutex);
864 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
868 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request to peer
869 * @rdata: private remote port data
871 * Locking Note: The rport lock is expected to be held before calling
874 static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
877 struct fc_lport *lport = rdata->local_port;
879 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
880 fc_rport_state(rdata));
882 fc_rport_state_enter(rdata, RPORT_ST_RTV);
884 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
886 fc_rport_error_retry(rdata, fp);
890 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
891 fc_rport_rtv_resp, rdata, lport->e_d_tov))
892 fc_rport_error_retry(rdata, fp);
894 kref_get(&rdata->kref);
898 * fc_rport_enter_logo() - Send Logout (LOGO) request to peer
899 * @rdata: private remote port data
901 * Locking Note: The rport lock is expected to be held before calling
904 static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
906 struct fc_lport *lport = rdata->local_port;
909 FC_RPORT_DBG(rdata, "Port entered LOGO state from %s state\n",
910 fc_rport_state(rdata));
912 fc_rport_state_enter(rdata, RPORT_ST_LOGO);
914 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
916 fc_rport_error_retry(rdata, fp);
920 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
921 fc_rport_logo_resp, rdata, lport->e_d_tov))
922 fc_rport_error_retry(rdata, fp);
924 kref_get(&rdata->kref);
928 * fc_rport_els_adisc_resp() - Address Discovery response handler
929 * @sp: current sequence in the ADISC exchange
930 * @fp: response frame
931 * @rdata_arg: remote port private.
933 * Locking Note: This function will be called without the rport lock
934 * held, but it will lock, call an _enter_* function or fc_rport_error
935 * and then unlock the rport.
937 static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
940 struct fc_rport_priv *rdata = rdata_arg;
941 struct fc_els_adisc *adisc;
944 mutex_lock(&rdata->rp_mutex);
946 FC_RPORT_DBG(rdata, "Received a ADISC response\n");
948 if (rdata->rp_state != RPORT_ST_ADISC) {
949 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
950 fc_rport_state(rdata));
957 fc_rport_error(rdata, fp);
962 * If address verification failed. Consider us logged out of the rport.
963 * Since the rport is still in discovery, we want to be
964 * logged in, so go to PLOGI state. Otherwise, go back to READY.
966 op = fc_frame_payload_op(fp);
967 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
968 if (op != ELS_LS_ACC || !adisc ||
969 ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
970 get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
971 get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) {
972 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
973 fc_rport_enter_plogi(rdata);
975 FC_RPORT_DBG(rdata, "ADISC OK\n");
976 fc_rport_enter_ready(rdata);
981 mutex_unlock(&rdata->rp_mutex);
982 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
986 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request to peer
987 * @rdata: remote port private data
989 * Locking Note: The rport lock is expected to be held before calling
992 static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
994 struct fc_lport *lport = rdata->local_port;
997 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
998 fc_rport_state(rdata));
1000 fc_rport_state_enter(rdata, RPORT_ST_ADISC);
1002 fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
1004 fc_rport_error_retry(rdata, fp);
1007 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
1008 fc_rport_adisc_resp, rdata, lport->e_d_tov))
1009 fc_rport_error_retry(rdata, fp);
1011 kref_get(&rdata->kref);
1015 * fc_rport_recv_adisc_req() - Handle incoming Address Discovery (ADISC) Request
1016 * @rdata: remote port private
1017 * @sp: current sequence in the ADISC exchange
1018 * @in_fp: ADISC request frame
1020 * Locking Note: Called with the lport and rport locks held.
1022 static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
1023 struct fc_seq *sp, struct fc_frame *in_fp)
1025 struct fc_lport *lport = rdata->local_port;
1026 struct fc_frame *fp;
1027 struct fc_exch *ep = fc_seq_exch(sp);
1028 struct fc_els_adisc *adisc;
1029 struct fc_seq_els_data rjt_data;
1032 FC_RPORT_DBG(rdata, "Received ADISC request\n");
1034 adisc = fc_frame_payload_get(in_fp, sizeof(*adisc));
1037 rjt_data.reason = ELS_RJT_PROT;
1038 rjt_data.explan = ELS_EXPL_INV_LEN;
1039 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1043 fp = fc_frame_alloc(lport, sizeof(*adisc));
1046 fc_adisc_fill(lport, fp);
1047 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1048 adisc->adisc_cmd = ELS_LS_ACC;
1049 sp = lport->tt.seq_start_next(sp);
1050 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1051 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
1052 FC_TYPE_ELS, f_ctl, 0);
1053 lport->tt.seq_send(lport, sp, fp);
1055 fc_frame_free(in_fp);
1059 * fc_rport_recv_els_req() - handle a validated ELS request.
1060 * @lport: Fibre Channel local port
1061 * @sp: current sequence in the PLOGI exchange
1062 * @fp: response frame
1064 * Handle incoming ELS requests that require port login.
1065 * The ELS opcode has already been validated by the caller.
1067 * Locking Note: Called with the lport lock held.
1069 static void fc_rport_recv_els_req(struct fc_lport *lport,
1070 struct fc_seq *sp, struct fc_frame *fp)
1072 struct fc_rport_priv *rdata;
1073 struct fc_frame_header *fh;
1074 struct fc_seq_els_data els_data;
1077 els_data.reason = ELS_RJT_UNAB;
1078 els_data.explan = ELS_EXPL_PLOGI_REQD;
1080 fh = fc_frame_header_get(fp);
1082 mutex_lock(&lport->disc.disc_mutex);
1083 rdata = lport->tt.rport_lookup(lport, ntoh24(fh->fh_s_id));
1085 mutex_unlock(&lport->disc.disc_mutex);
1088 mutex_lock(&rdata->rp_mutex);
1089 mutex_unlock(&lport->disc.disc_mutex);
1091 switch (rdata->rp_state) {
1094 case RPORT_ST_READY:
1095 case RPORT_ST_ADISC:
1098 mutex_unlock(&rdata->rp_mutex);
1102 switch (fc_frame_payload_op(fp)) {
1104 fc_rport_recv_prli_req(rdata, sp, fp);
1107 fc_rport_recv_prlo_req(rdata, sp, fp);
1110 fc_rport_recv_adisc_req(rdata, sp, fp);
1114 lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data);
1118 lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
1121 fc_frame_free(fp); /* can't happen */
1125 mutex_unlock(&rdata->rp_mutex);
1129 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
1134 * fc_rport_recv_req() - Handle a received ELS request from a rport
1135 * @sp: current sequence in the PLOGI exchange
1136 * @fp: response frame
1137 * @lport: Fibre Channel local port
1139 * Locking Note: Called with the lport lock held.
1141 void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
1142 struct fc_lport *lport)
1144 struct fc_seq_els_data els_data;
1147 * Handle PLOGI and LOGO requests separately, since they
1148 * don't require prior login.
1149 * Check for unsupported opcodes first and reject them.
1150 * For some ops, it would be incorrect to reject with "PLOGI required".
1152 switch (fc_frame_payload_op(fp)) {
1154 fc_rport_recv_plogi_req(lport, sp, fp);
1157 fc_rport_recv_logo_req(lport, sp, fp);
1164 fc_rport_recv_els_req(lport, sp, fp);
1169 els_data.reason = ELS_RJT_UNSUP;
1170 els_data.explan = ELS_EXPL_NONE;
1171 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
1177 * fc_rport_recv_plogi_req() - Handle incoming Port Login (PLOGI) request
1178 * @lport: local port
1179 * @sp: current sequence in the PLOGI exchange
1180 * @fp: PLOGI request frame
1182 * Locking Note: The rport lock is held before calling this function.
1184 static void fc_rport_recv_plogi_req(struct fc_lport *lport,
1185 struct fc_seq *sp, struct fc_frame *rx_fp)
1187 struct fc_disc *disc;
1188 struct fc_rport_priv *rdata;
1189 struct fc_frame *fp = rx_fp;
1191 struct fc_frame_header *fh;
1192 struct fc_els_flogi *pl;
1193 struct fc_seq_els_data rjt_data;
1197 fh = fc_frame_header_get(fp);
1198 sid = ntoh24(fh->fh_s_id);
1200 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
1202 pl = fc_frame_payload_get(fp, sizeof(*pl));
1204 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
1205 rjt_data.reason = ELS_RJT_PROT;
1206 rjt_data.explan = ELS_EXPL_INV_LEN;
1210 disc = &lport->disc;
1211 mutex_lock(&disc->disc_mutex);
1212 rdata = lport->tt.rport_create(lport, sid);
1214 mutex_unlock(&disc->disc_mutex);
1215 rjt_data.reason = ELS_RJT_UNAB;
1216 rjt_data.explan = ELS_EXPL_INSUF_RES;
1220 mutex_lock(&rdata->rp_mutex);
1221 mutex_unlock(&disc->disc_mutex);
1223 rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
1224 rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn);
1227 * If the rport was just created, possibly due to the incoming PLOGI,
1228 * set the state appropriately and accept the PLOGI.
1230 * If we had also sent a PLOGI, and if the received PLOGI is from a
1231 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
1232 * "command already in progress".
1234 * XXX TBD: If the session was ready before, the PLOGI should result in
1235 * all outstanding exchanges being reset.
1237 switch (rdata->rp_state) {
1239 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
1241 case RPORT_ST_PLOGI:
1242 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
1243 if (rdata->ids.port_name < lport->wwpn) {
1244 mutex_unlock(&rdata->rp_mutex);
1245 rjt_data.reason = ELS_RJT_INPROG;
1246 rjt_data.explan = ELS_EXPL_NONE;
1251 case RPORT_ST_READY:
1252 case RPORT_ST_ADISC:
1253 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
1254 "- ignored for now\n", rdata->rp_state);
1255 /* XXX TBD - should reset */
1257 case RPORT_ST_DELETE:
1259 FC_RPORT_DBG(rdata, "Received PLOGI in unexpected state %d\n",
1261 fc_frame_free(rx_fp);
1266 * Get session payload size from incoming PLOGI.
1268 rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
1269 fc_frame_free(rx_fp);
1272 * Send LS_ACC. If this fails, the originator should retry.
1274 sp = lport->tt.seq_start_next(sp);
1277 fp = fc_frame_alloc(lport, sizeof(*pl));
1281 fc_plogi_fill(lport, fp, ELS_LS_ACC);
1282 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1283 ep = fc_seq_exch(sp);
1284 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
1285 FC_TYPE_ELS, f_ctl, 0);
1286 lport->tt.seq_send(lport, sp, fp);
1287 fc_rport_enter_prli(rdata);
1289 mutex_unlock(&rdata->rp_mutex);
1293 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1298 * fc_rport_recv_prli_req() - Handle incoming Process Login (PRLI) request
1299 * @rdata: private remote port data
1300 * @sp: current sequence in the PRLI exchange
1301 * @fp: PRLI request frame
1303 * Locking Note: The rport lock is exected to be held before calling
1306 static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
1307 struct fc_seq *sp, struct fc_frame *rx_fp)
1309 struct fc_lport *lport = rdata->local_port;
1311 struct fc_frame *fp;
1312 struct fc_frame_header *fh;
1314 struct fc_els_prli prli;
1315 struct fc_els_spp spp;
1317 struct fc_els_spp *rspp; /* request service param page */
1318 struct fc_els_spp *spp; /* response spp */
1321 enum fc_els_rjt_reason reason = ELS_RJT_UNAB;
1322 enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
1323 enum fc_els_spp_resp resp;
1324 struct fc_seq_els_data rjt_data;
1327 u32 roles = FC_RPORT_ROLE_UNKNOWN;
1330 fh = fc_frame_header_get(rx_fp);
1332 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
1333 fc_rport_state(rdata));
1335 switch (rdata->rp_state) {
1338 case RPORT_ST_READY:
1339 case RPORT_ST_ADISC:
1340 reason = ELS_RJT_NONE;
1343 fc_frame_free(rx_fp);
1347 len = fr_len(rx_fp) - sizeof(*fh);
1348 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1350 reason = ELS_RJT_PROT;
1351 explan = ELS_EXPL_INV_LEN;
1353 plen = ntohs(pp->prli.prli_len);
1354 if ((plen % 4) != 0 || plen > len) {
1355 reason = ELS_RJT_PROT;
1356 explan = ELS_EXPL_INV_LEN;
1357 } else if (plen < len) {
1360 plen = pp->prli.prli_spp_len;
1361 if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1362 plen > len || len < sizeof(*pp)) {
1363 reason = ELS_RJT_PROT;
1364 explan = ELS_EXPL_INV_LEN;
1368 if (reason != ELS_RJT_NONE ||
1369 (fp = fc_frame_alloc(lport, len)) == NULL) {
1370 rjt_data.reason = reason;
1371 rjt_data.explan = explan;
1372 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1374 sp = lport->tt.seq_start_next(sp);
1376 pp = fc_frame_payload_get(fp, len);
1379 pp->prli.prli_cmd = ELS_LS_ACC;
1380 pp->prli.prli_spp_len = plen;
1381 pp->prli.prli_len = htons(len);
1382 len -= sizeof(struct fc_els_prli);
1384 /* reinitialize remote port roles */
1385 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1388 * Go through all the service parameter pages and build
1389 * response. If plen indicates longer SPP than standard,
1390 * use that. The entire response has been pre-cleared above.
1393 while (len >= plen) {
1394 spp->spp_type = rspp->spp_type;
1395 spp->spp_type_ext = rspp->spp_type_ext;
1396 spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
1397 resp = FC_SPP_RESP_ACK;
1398 if (rspp->spp_flags & FC_SPP_RPA_VAL)
1399 resp = FC_SPP_RESP_NO_PA;
1400 switch (rspp->spp_type) {
1401 case 0: /* common to all FC-4 types */
1404 fcp_parm = ntohl(rspp->spp_params);
1405 if (fcp_parm * FCP_SPPF_RETRY)
1406 rdata->flags |= FC_RP_FLAGS_RETRY;
1407 rdata->supported_classes = FC_COS_CLASS3;
1408 if (fcp_parm & FCP_SPPF_INIT_FCN)
1409 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1410 if (fcp_parm & FCP_SPPF_TARG_FCN)
1411 roles |= FC_RPORT_ROLE_FCP_TARGET;
1412 rdata->ids.roles = roles;
1415 htonl(lport->service_params);
1418 resp = FC_SPP_RESP_INVL;
1421 spp->spp_flags |= resp;
1423 rspp = (struct fc_els_spp *)((char *)rspp + plen);
1424 spp = (struct fc_els_spp *)((char *)spp + plen);
1428 * Send LS_ACC. If this fails, the originator should retry.
1430 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
1431 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1432 ep = fc_seq_exch(sp);
1433 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
1434 FC_TYPE_ELS, f_ctl, 0);
1435 lport->tt.seq_send(lport, sp, fp);
1438 * Get lock and re-check state.
1440 switch (rdata->rp_state) {
1442 fc_rport_enter_ready(rdata);
1444 case RPORT_ST_READY:
1445 case RPORT_ST_ADISC:
1451 fc_frame_free(rx_fp);
1455 * fc_rport_recv_prlo_req() - Handle incoming Process Logout (PRLO) request
1456 * @rdata: private remote port data
1457 * @sp: current sequence in the PRLO exchange
1458 * @fp: PRLO request frame
1460 * Locking Note: The rport lock is exected to be held before calling
1463 static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
1465 struct fc_frame *fp)
1467 struct fc_lport *lport = rdata->local_port;
1469 struct fc_frame_header *fh;
1470 struct fc_seq_els_data rjt_data;
1472 fh = fc_frame_header_get(fp);
1474 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
1475 fc_rport_state(rdata));
1478 rjt_data.reason = ELS_RJT_UNAB;
1479 rjt_data.explan = ELS_EXPL_NONE;
1480 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1485 * fc_rport_recv_logo_req() - Handle incoming Logout (LOGO) request
1486 * @lport: local port.
1487 * @sp: current sequence in the LOGO exchange
1488 * @fp: LOGO request frame
1490 * Locking Note: The rport lock is exected to be held before calling
1493 static void fc_rport_recv_logo_req(struct fc_lport *lport,
1495 struct fc_frame *fp)
1497 struct fc_frame_header *fh;
1498 struct fc_rport_priv *rdata;
1501 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
1503 fh = fc_frame_header_get(fp);
1504 sid = ntoh24(fh->fh_s_id);
1506 mutex_lock(&lport->disc.disc_mutex);
1507 rdata = lport->tt.rport_lookup(lport, sid);
1509 mutex_lock(&rdata->rp_mutex);
1510 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
1511 fc_rport_state(rdata));
1514 * If the remote port was created due to discovery,
1515 * log back in. It may have seen a stale RSCN about us.
1517 if (rdata->rp_state != RPORT_ST_DELETE && rdata->disc_id)
1518 fc_rport_enter_plogi(rdata);
1520 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
1521 mutex_unlock(&rdata->rp_mutex);
1523 FC_RPORT_ID_DBG(lport, sid,
1524 "Received LOGO from non-logged-in port\n");
1525 mutex_unlock(&lport->disc.disc_mutex);
1529 static void fc_rport_flush_queue(void)
1531 flush_workqueue(rport_event_queue);
1534 int fc_rport_init(struct fc_lport *lport)
1536 if (!lport->tt.rport_lookup)
1537 lport->tt.rport_lookup = fc_rport_lookup;
1539 if (!lport->tt.rport_create)
1540 lport->tt.rport_create = fc_rport_create;
1542 if (!lport->tt.rport_login)
1543 lport->tt.rport_login = fc_rport_login;
1545 if (!lport->tt.rport_logoff)
1546 lport->tt.rport_logoff = fc_rport_logoff;
1548 if (!lport->tt.rport_recv_req)
1549 lport->tt.rport_recv_req = fc_rport_recv_req;
1551 if (!lport->tt.rport_flush_queue)
1552 lport->tt.rport_flush_queue = fc_rport_flush_queue;
1554 if (!lport->tt.rport_destroy)
1555 lport->tt.rport_destroy = fc_rport_destroy;
1559 EXPORT_SYMBOL(fc_rport_init);
1561 int fc_setup_rport(void)
1563 rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
1564 if (!rport_event_queue)
1568 EXPORT_SYMBOL(fc_setup_rport);
1570 void fc_destroy_rport(void)
1572 destroy_workqueue(rport_event_queue);
1574 EXPORT_SYMBOL(fc_destroy_rport);
1576 void fc_rport_terminate_io(struct fc_rport *rport)
1578 struct fc_rport_libfc_priv *rp = rport->dd_data;
1579 struct fc_lport *lport = rp->local_port;
1581 lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
1582 lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
1584 EXPORT_SYMBOL(fc_rport_terminate_io);