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_work(struct work_struct *);
86 static const char *fc_rport_state_names[] = {
87 [RPORT_ST_NONE] = "None",
88 [RPORT_ST_INIT] = "Init",
89 [RPORT_ST_PLOGI] = "PLOGI",
90 [RPORT_ST_PRLI] = "PRLI",
91 [RPORT_ST_RTV] = "RTV",
92 [RPORT_ST_READY] = "Ready",
93 [RPORT_ST_LOGO] = "LOGO",
96 static void fc_rport_rogue_destroy(struct device *dev)
98 struct fc_rport *rport = dev_to_rport(dev);
99 FC_DEBUG_RPORT("Destroying rogue rport (%6x)\n", rport->port_id);
103 struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *dp)
105 struct fc_rport *rport;
106 struct fc_rport_libfc_priv *rdata;
107 rport = kzalloc(sizeof(*rport) + sizeof(*rdata), GFP_KERNEL);
112 rdata = RPORT_TO_PRIV(rport);
114 rport->dd_data = rdata;
115 rport->port_id = dp->ids.port_id;
116 rport->port_name = dp->ids.port_name;
117 rport->node_name = dp->ids.node_name;
118 rport->roles = dp->ids.roles;
119 rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
121 * Note: all this libfc rogue rport code will be removed for
122 * upstream so it fine that this is really ugly and hacky right now.
124 device_initialize(&rport->dev);
125 rport->dev.release = fc_rport_rogue_destroy;
127 mutex_init(&rdata->rp_mutex);
128 rdata->local_port = dp->lp;
129 rdata->trans_state = FC_PORTSTATE_ROGUE;
130 rdata->rp_state = RPORT_ST_INIT;
131 rdata->event = RPORT_EV_NONE;
132 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
134 rdata->e_d_tov = dp->lp->e_d_tov;
135 rdata->r_a_tov = dp->lp->r_a_tov;
136 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
137 INIT_WORK(&rdata->event_work, fc_rport_work);
139 * For good measure, but not necessary as we should only
140 * add REAL rport to the lport list.
142 INIT_LIST_HEAD(&rdata->peers);
148 * fc_rport_state - return a string for the state the rport is in
149 * @rport: The rport whose state we want to get a string for
151 static const char *fc_rport_state(struct fc_rport *rport)
154 struct fc_rport_libfc_priv *rdata = rport->dd_data;
156 cp = fc_rport_state_names[rdata->rp_state];
163 * fc_set_rport_loss_tmo - Set the remote port loss timeout in seconds.
164 * @rport: Pointer to Fibre Channel remote port structure
165 * @timeout: timeout in seconds
167 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
170 rport->dev_loss_tmo = timeout + 5;
172 rport->dev_loss_tmo = 30;
174 EXPORT_SYMBOL(fc_set_rport_loss_tmo);
177 * fc_plogi_get_maxframe - Get max payload from the common service parameters
178 * @flp: FLOGI payload structure
179 * @maxval: upper limit, may be less than what is in the service parameters
182 fc_plogi_get_maxframe(struct fc_els_flogi *flp, unsigned int maxval)
187 * Get max payload from the common service parameters and the
188 * class 3 receive data field size.
190 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
191 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
193 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
194 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
200 * fc_rport_state_enter - Change the rport's state
201 * @rport: The rport whose state should change
202 * @new: The new state of the rport
204 * Locking Note: Called with the rport lock held
206 static void fc_rport_state_enter(struct fc_rport *rport,
207 enum fc_rport_state new)
209 struct fc_rport_libfc_priv *rdata = rport->dd_data;
210 if (rdata->rp_state != new)
212 rdata->rp_state = new;
215 static void fc_rport_work(struct work_struct *work)
217 struct fc_rport_libfc_priv *rdata =
218 container_of(work, struct fc_rport_libfc_priv, event_work);
219 enum fc_rport_event event;
220 enum fc_rport_trans_state trans_state;
221 struct fc_lport *lport = rdata->local_port;
222 struct fc_rport_operations *rport_ops;
223 struct fc_rport *rport = PRIV_TO_RPORT(rdata);
225 mutex_lock(&rdata->rp_mutex);
226 event = rdata->event;
227 rport_ops = rdata->ops;
229 if (event == RPORT_EV_CREATED) {
230 struct fc_rport *new_rport;
231 struct fc_rport_libfc_priv *new_rdata;
232 struct fc_rport_identifiers ids;
234 ids.port_id = rport->port_id;
235 ids.roles = rport->roles;
236 ids.port_name = rport->port_name;
237 ids.node_name = rport->node_name;
239 mutex_unlock(&rdata->rp_mutex);
241 new_rport = fc_remote_port_add(lport->host, 0, &ids);
244 * Switch from the rogue rport to the rport
245 * returned by the FC class.
247 new_rport->maxframe_size = rport->maxframe_size;
249 new_rdata = new_rport->dd_data;
250 new_rdata->e_d_tov = rdata->e_d_tov;
251 new_rdata->r_a_tov = rdata->r_a_tov;
252 new_rdata->ops = rdata->ops;
253 new_rdata->local_port = rdata->local_port;
254 new_rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
255 new_rdata->trans_state = FC_PORTSTATE_REAL;
256 mutex_init(&new_rdata->rp_mutex);
257 INIT_DELAYED_WORK(&new_rdata->retry_work,
259 INIT_LIST_HEAD(&new_rdata->peers);
260 INIT_WORK(&new_rdata->event_work, fc_rport_work);
262 fc_rport_state_enter(new_rport, RPORT_ST_READY);
264 FC_DBG("Failed to create the rport for port "
265 "(%6x).\n", ids.port_id);
266 event = RPORT_EV_FAILED;
268 put_device(&rport->dev);
270 rdata = new_rport->dd_data;
271 if (rport_ops->event_callback)
272 rport_ops->event_callback(lport, rport, event);
273 } else if ((event == RPORT_EV_FAILED) ||
274 (event == RPORT_EV_LOGO) ||
275 (event == RPORT_EV_STOP)) {
276 trans_state = rdata->trans_state;
277 mutex_unlock(&rdata->rp_mutex);
278 if (rport_ops->event_callback)
279 rport_ops->event_callback(lport, rport, event);
280 if (trans_state == FC_PORTSTATE_ROGUE)
281 put_device(&rport->dev);
283 fc_remote_port_delete(rport);
285 mutex_unlock(&rdata->rp_mutex);
289 * fc_rport_login - Start the remote port login state machine
290 * @rport: Fibre Channel remote port
292 * Locking Note: Called without the rport lock held. This
293 * function will hold the rport lock, call an _enter_*
294 * function and then unlock the rport.
296 int fc_rport_login(struct fc_rport *rport)
298 struct fc_rport_libfc_priv *rdata = rport->dd_data;
300 mutex_lock(&rdata->rp_mutex);
302 FC_DEBUG_RPORT("Login to port (%6x)\n", rport->port_id);
304 fc_rport_enter_plogi(rport);
306 mutex_unlock(&rdata->rp_mutex);
312 * fc_rport_logoff - Logoff and remove an rport
313 * @rport: Fibre Channel remote port to be removed
315 * Locking Note: Called without the rport lock held. This
316 * function will hold the rport lock, call an _enter_*
317 * function and then unlock the rport.
319 int fc_rport_logoff(struct fc_rport *rport)
321 struct fc_rport_libfc_priv *rdata = rport->dd_data;
323 mutex_lock(&rdata->rp_mutex);
325 FC_DEBUG_RPORT("Remove port (%6x)\n", rport->port_id);
327 fc_rport_enter_logo(rport);
330 * Change the state to NONE so that we discard
333 fc_rport_state_enter(rport, RPORT_ST_NONE);
335 mutex_unlock(&rdata->rp_mutex);
337 cancel_delayed_work_sync(&rdata->retry_work);
339 mutex_lock(&rdata->rp_mutex);
341 rdata->event = RPORT_EV_STOP;
342 queue_work(rport_event_queue, &rdata->event_work);
344 mutex_unlock(&rdata->rp_mutex);
350 * fc_rport_enter_ready - The rport is ready
351 * @rport: Fibre Channel remote port that is ready
353 * Locking Note: The rport lock is expected to be held before calling
356 static void fc_rport_enter_ready(struct fc_rport *rport)
358 struct fc_rport_libfc_priv *rdata = rport->dd_data;
360 fc_rport_state_enter(rport, RPORT_ST_READY);
362 FC_DEBUG_RPORT("Port (%6x) is Ready\n", rport->port_id);
364 rdata->event = RPORT_EV_CREATED;
365 queue_work(rport_event_queue, &rdata->event_work);
369 * fc_rport_timeout - Handler for the retry_work timer.
370 * @work: The work struct of the fc_rport_libfc_priv
372 * Locking Note: Called without the rport lock held. This
373 * function will hold the rport lock, call an _enter_*
374 * function and then unlock the rport.
376 static void fc_rport_timeout(struct work_struct *work)
378 struct fc_rport_libfc_priv *rdata =
379 container_of(work, struct fc_rport_libfc_priv, retry_work.work);
380 struct fc_rport *rport = PRIV_TO_RPORT(rdata);
382 mutex_lock(&rdata->rp_mutex);
384 switch (rdata->rp_state) {
386 fc_rport_enter_plogi(rport);
389 fc_rport_enter_prli(rport);
392 fc_rport_enter_rtv(rport);
395 fc_rport_enter_logo(rport);
403 mutex_unlock(&rdata->rp_mutex);
404 put_device(&rport->dev);
408 * fc_rport_error - Handler for any errors
409 * @rport: The fc_rport object
410 * @fp: The frame pointer
412 * If the error was caused by a resource allocation failure
413 * then wait for half a second and retry, otherwise retry
416 * Locking Note: The rport lock is expected to be held before
417 * calling this routine
419 static void fc_rport_error(struct fc_rport *rport, struct fc_frame *fp)
421 struct fc_rport_libfc_priv *rdata = rport->dd_data;
422 unsigned long delay = 0;
424 FC_DEBUG_RPORT("Error %ld in state %s, retries %d\n",
425 PTR_ERR(fp), fc_rport_state(rport), rdata->retries);
427 if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
429 * Memory allocation failure, or the exchange timed out.
432 if (rdata->retries < rdata->local_port->max_retry_count) {
435 delay = msecs_to_jiffies(500);
436 get_device(&rport->dev);
437 schedule_delayed_work(&rdata->retry_work, delay);
439 switch (rdata->rp_state) {
443 rdata->event = RPORT_EV_FAILED;
444 queue_work(rport_event_queue,
448 fc_rport_enter_ready(rport);
460 * fc_rport_plogi_recv_resp - Handle incoming ELS PLOGI response
461 * @sp: current sequence in the PLOGI exchange
462 * @fp: response frame
463 * @rp_arg: Fibre Channel remote port
465 * Locking Note: This function will be called without the rport lock
466 * held, but it will lock, call an _enter_* function or fc_rport_error
467 * and then unlock the rport.
469 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
472 struct fc_rport *rport = rp_arg;
473 struct fc_rport_libfc_priv *rdata = rport->dd_data;
474 struct fc_lport *lport = rdata->local_port;
475 struct fc_els_flogi *plp;
481 mutex_lock(&rdata->rp_mutex);
483 FC_DEBUG_RPORT("Received a PLOGI response from port (%6x)\n",
486 if (rdata->rp_state != RPORT_ST_PLOGI) {
487 FC_DBG("Received a PLOGI response, but in state %s\n",
488 fc_rport_state(rport));
493 fc_rport_error(rport, fp);
497 op = fc_frame_payload_op(fp);
498 if (op == ELS_LS_ACC &&
499 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
500 rport->port_name = get_unaligned_be64(&plp->fl_wwpn);
501 rport->node_name = get_unaligned_be64(&plp->fl_wwnn);
503 tov = ntohl(plp->fl_csp.sp_e_d_tov);
504 if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR)
506 if (tov > rdata->e_d_tov)
507 rdata->e_d_tov = tov;
508 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
509 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
510 if (cssp_seq < csp_seq)
512 rdata->max_seq = csp_seq;
513 rport->maxframe_size =
514 fc_plogi_get_maxframe(plp, lport->mfs);
517 * If the rport is one of the well known addresses
518 * we skip PRLI and RTV and go straight to READY.
520 if (rport->port_id >= FC_FID_DOM_MGR)
521 fc_rport_enter_ready(rport);
523 fc_rport_enter_prli(rport);
525 fc_rport_error(rport, fp);
530 mutex_unlock(&rdata->rp_mutex);
531 put_device(&rport->dev);
535 * fc_rport_enter_plogi - Send Port Login (PLOGI) request to peer
536 * @rport: Fibre Channel remote port to send PLOGI to
538 * Locking Note: The rport lock is expected to be held before calling
541 static void fc_rport_enter_plogi(struct fc_rport *rport)
543 struct fc_rport_libfc_priv *rdata = rport->dd_data;
544 struct fc_lport *lport = rdata->local_port;
547 FC_DEBUG_RPORT("Port (%6x) entered PLOGI state from %s state\n",
548 rport->port_id, fc_rport_state(rport));
550 fc_rport_state_enter(rport, RPORT_ST_PLOGI);
552 rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
553 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
555 fc_rport_error(rport, fp);
558 rdata->e_d_tov = lport->e_d_tov;
560 if (!lport->tt.elsct_send(lport, rport, fp, ELS_PLOGI,
561 fc_rport_plogi_resp, rport, lport->e_d_tov))
562 fc_rport_error(rport, fp);
564 get_device(&rport->dev);
568 * fc_rport_prli_resp - Process Login (PRLI) response handler
569 * @sp: current sequence in the PRLI exchange
570 * @fp: response frame
571 * @rp_arg: Fibre Channel remote port
573 * Locking Note: This function will be called without the rport lock
574 * held, but it will lock, call an _enter_* function or fc_rport_error
575 * and then unlock the rport.
577 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
580 struct fc_rport *rport = rp_arg;
581 struct fc_rport_libfc_priv *rdata = rport->dd_data;
583 struct fc_els_prli prli;
584 struct fc_els_spp spp;
586 u32 roles = FC_RPORT_ROLE_UNKNOWN;
590 mutex_lock(&rdata->rp_mutex);
592 FC_DEBUG_RPORT("Received a PRLI response from port (%6x)\n",
595 if (rdata->rp_state != RPORT_ST_PRLI) {
596 FC_DBG("Received a PRLI response, but in state %s\n",
597 fc_rport_state(rport));
602 fc_rport_error(rport, fp);
606 op = fc_frame_payload_op(fp);
607 if (op == ELS_LS_ACC) {
608 pp = fc_frame_payload_get(fp, sizeof(*pp));
609 if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
610 fcp_parm = ntohl(pp->spp.spp_params);
611 if (fcp_parm & FCP_SPPF_RETRY)
612 rdata->flags |= FC_RP_FLAGS_RETRY;
615 rport->supported_classes = FC_COS_CLASS3;
616 if (fcp_parm & FCP_SPPF_INIT_FCN)
617 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
618 if (fcp_parm & FCP_SPPF_TARG_FCN)
619 roles |= FC_RPORT_ROLE_FCP_TARGET;
621 rport->roles = roles;
622 fc_rport_enter_rtv(rport);
625 FC_DBG("Bad ELS response\n");
626 rdata->event = RPORT_EV_FAILED;
627 queue_work(rport_event_queue, &rdata->event_work);
633 mutex_unlock(&rdata->rp_mutex);
634 put_device(&rport->dev);
638 * fc_rport_logo_resp - Logout (LOGO) response handler
639 * @sp: current sequence in the LOGO exchange
640 * @fp: response frame
641 * @rp_arg: Fibre Channel remote port
643 * Locking Note: This function will be called without the rport lock
644 * held, but it will lock, call an _enter_* function or fc_rport_error
645 * and then unlock the rport.
647 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
650 struct fc_rport *rport = rp_arg;
651 struct fc_rport_libfc_priv *rdata = rport->dd_data;
654 mutex_lock(&rdata->rp_mutex);
656 FC_DEBUG_RPORT("Received a LOGO response from port (%6x)\n",
660 fc_rport_error(rport, fp);
664 if (rdata->rp_state != RPORT_ST_LOGO) {
665 FC_DEBUG_RPORT("Received a LOGO response, but in state %s\n",
666 fc_rport_state(rport));
670 op = fc_frame_payload_op(fp);
671 if (op == ELS_LS_ACC) {
672 fc_rport_enter_rtv(rport);
674 FC_DBG("Bad ELS response\n");
675 rdata->event = RPORT_EV_LOGO;
676 queue_work(rport_event_queue, &rdata->event_work);
682 mutex_unlock(&rdata->rp_mutex);
683 put_device(&rport->dev);
687 * fc_rport_enter_prli - Send Process Login (PRLI) request to peer
688 * @rport: Fibre Channel remote port to send PRLI to
690 * Locking Note: The rport lock is expected to be held before calling
693 static void fc_rport_enter_prli(struct fc_rport *rport)
695 struct fc_rport_libfc_priv *rdata = rport->dd_data;
696 struct fc_lport *lport = rdata->local_port;
698 struct fc_els_prli prli;
699 struct fc_els_spp spp;
703 FC_DEBUG_RPORT("Port (%6x) entered PRLI state from %s state\n",
704 rport->port_id, fc_rport_state(rport));
706 fc_rport_state_enter(rport, RPORT_ST_PRLI);
708 fp = fc_frame_alloc(lport, sizeof(*pp));
710 fc_rport_error(rport, fp);
714 if (!lport->tt.elsct_send(lport, rport, fp, ELS_PRLI,
715 fc_rport_prli_resp, rport, lport->e_d_tov))
716 fc_rport_error(rport, fp);
718 get_device(&rport->dev);
722 * fc_rport_els_rtv_resp - Request Timeout Value response handler
723 * @sp: current sequence in the RTV exchange
724 * @fp: response frame
725 * @rp_arg: Fibre Channel remote port
727 * Many targets don't seem to support this.
729 * Locking Note: This function will be called without the rport lock
730 * held, but it will lock, call an _enter_* function or fc_rport_error
731 * and then unlock the rport.
733 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
736 struct fc_rport *rport = rp_arg;
737 struct fc_rport_libfc_priv *rdata = rport->dd_data;
740 mutex_lock(&rdata->rp_mutex);
742 FC_DEBUG_RPORT("Received a RTV response from port (%6x)\n",
745 if (rdata->rp_state != RPORT_ST_RTV) {
746 FC_DBG("Received a RTV response, but in state %s\n",
747 fc_rport_state(rport));
752 fc_rport_error(rport, fp);
756 op = fc_frame_payload_op(fp);
757 if (op == ELS_LS_ACC) {
758 struct fc_els_rtv_acc *rtv;
762 rtv = fc_frame_payload_get(fp, sizeof(*rtv));
764 toq = ntohl(rtv->rtv_toq);
765 tov = ntohl(rtv->rtv_r_a_tov);
768 rdata->r_a_tov = tov;
769 tov = ntohl(rtv->rtv_e_d_tov);
770 if (toq & FC_ELS_RTV_EDRES)
774 rdata->e_d_tov = tov;
778 fc_rport_enter_ready(rport);
783 mutex_unlock(&rdata->rp_mutex);
784 put_device(&rport->dev);
788 * fc_rport_enter_rtv - Send Request Timeout Value (RTV) request to peer
789 * @rport: Fibre Channel remote port to send RTV to
791 * Locking Note: The rport lock is expected to be held before calling
794 static void fc_rport_enter_rtv(struct fc_rport *rport)
797 struct fc_rport_libfc_priv *rdata = rport->dd_data;
798 struct fc_lport *lport = rdata->local_port;
800 FC_DEBUG_RPORT("Port (%6x) entered RTV state from %s state\n",
801 rport->port_id, fc_rport_state(rport));
803 fc_rport_state_enter(rport, RPORT_ST_RTV);
805 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
807 fc_rport_error(rport, fp);
811 if (!lport->tt.elsct_send(lport, rport, fp, ELS_RTV,
812 fc_rport_rtv_resp, rport, lport->e_d_tov))
813 fc_rport_error(rport, fp);
815 get_device(&rport->dev);
819 * fc_rport_enter_logo - Send Logout (LOGO) request to peer
820 * @rport: Fibre Channel remote port to send LOGO to
822 * Locking Note: The rport lock is expected to be held before calling
825 static void fc_rport_enter_logo(struct fc_rport *rport)
827 struct fc_rport_libfc_priv *rdata = rport->dd_data;
828 struct fc_lport *lport = rdata->local_port;
831 FC_DEBUG_RPORT("Port (%6x) entered LOGO state from %s state\n",
832 rport->port_id, fc_rport_state(rport));
834 fc_rport_state_enter(rport, RPORT_ST_LOGO);
836 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
838 fc_rport_error(rport, fp);
842 if (!lport->tt.elsct_send(lport, rport, fp, ELS_LOGO,
843 fc_rport_logo_resp, rport, lport->e_d_tov))
844 fc_rport_error(rport, fp);
846 get_device(&rport->dev);
851 * fc_rport_recv_req - Receive a request from a rport
852 * @sp: current sequence in the PLOGI exchange
853 * @fp: response frame
854 * @rp_arg: Fibre Channel remote port
856 * Locking Note: Called without the rport lock held. This
857 * function will hold the rport lock, call an _enter_*
858 * function and then unlock the rport.
860 void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
861 struct fc_rport *rport)
863 struct fc_rport_libfc_priv *rdata = rport->dd_data;
864 struct fc_lport *lport = rdata->local_port;
866 struct fc_frame_header *fh;
867 struct fc_seq_els_data els_data;
870 mutex_lock(&rdata->rp_mutex);
873 els_data.explan = ELS_EXPL_NONE;
874 els_data.reason = ELS_RJT_NONE;
876 fh = fc_frame_header_get(fp);
878 if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) {
879 op = fc_frame_payload_op(fp);
882 fc_rport_recv_plogi_req(rport, sp, fp);
885 fc_rport_recv_prli_req(rport, sp, fp);
888 fc_rport_recv_prlo_req(rport, sp, fp);
891 fc_rport_recv_logo_req(rport, sp, fp);
895 lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data);
899 lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
902 els_data.reason = ELS_RJT_UNSUP;
903 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
908 mutex_unlock(&rdata->rp_mutex);
912 * fc_rport_recv_plogi_req - Handle incoming Port Login (PLOGI) request
913 * @rport: Fibre Channel remote port that initiated PLOGI
914 * @sp: current sequence in the PLOGI exchange
915 * @fp: PLOGI request frame
917 * Locking Note: The rport lock is exected to be held before calling
920 static void fc_rport_recv_plogi_req(struct fc_rport *rport,
921 struct fc_seq *sp, struct fc_frame *rx_fp)
923 struct fc_rport_libfc_priv *rdata = rport->dd_data;
924 struct fc_lport *lport = rdata->local_port;
925 struct fc_frame *fp = rx_fp;
927 struct fc_frame_header *fh;
928 struct fc_els_flogi *pl;
929 struct fc_seq_els_data rjt_data;
933 enum fc_els_rjt_reason reject = 0;
937 fh = fc_frame_header_get(fp);
939 FC_DEBUG_RPORT("Received PLOGI request from port (%6x) "
940 "while in state %s\n", ntoh24(fh->fh_s_id),
941 fc_rport_state(rport));
943 sid = ntoh24(fh->fh_s_id);
944 pl = fc_frame_payload_get(fp, sizeof(*pl));
946 FC_DBG("incoming PLOGI from %x too short\n", sid);
948 /* XXX TBD: send reject? */
952 wwpn = get_unaligned_be64(&pl->fl_wwpn);
953 wwnn = get_unaligned_be64(&pl->fl_wwnn);
956 * If the session was just created, possibly due to the incoming PLOGI,
957 * set the state appropriately and accept the PLOGI.
959 * If we had also sent a PLOGI, and if the received PLOGI is from a
960 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
961 * "command already in progress".
963 * XXX TBD: If the session was ready before, the PLOGI should result in
964 * all outstanding exchanges being reset.
966 switch (rdata->rp_state) {
968 FC_DEBUG_RPORT("incoming PLOGI from %6x wwpn %llx state INIT "
969 "- reject\n", sid, wwpn);
970 reject = ELS_RJT_UNSUP;
973 FC_DEBUG_RPORT("incoming PLOGI from %x in PLOGI state %d\n",
974 sid, rdata->rp_state);
975 if (wwpn < lport->wwpn)
976 reject = ELS_RJT_INPROG;
980 FC_DEBUG_RPORT("incoming PLOGI from %x in logged-in state %d "
981 "- ignored for now\n", sid, rdata->rp_state);
982 /* XXX TBD - should reset */
986 FC_DEBUG_RPORT("incoming PLOGI from %x in unexpected "
987 "state %d\n", sid, rdata->rp_state);
992 rjt_data.reason = reject;
993 rjt_data.explan = ELS_EXPL_NONE;
994 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
997 fp = fc_frame_alloc(lport, sizeof(*pl));
1000 rjt_data.reason = ELS_RJT_UNAB;
1001 rjt_data.explan = ELS_EXPL_NONE;
1002 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1005 sp = lport->tt.seq_start_next(sp);
1007 fc_rport_set_name(rport, wwpn, wwnn);
1010 * Get session payload size from incoming PLOGI.
1012 rport->maxframe_size =
1013 fc_plogi_get_maxframe(pl, lport->mfs);
1014 fc_frame_free(rx_fp);
1015 fc_plogi_fill(lport, fp, ELS_LS_ACC);
1018 * Send LS_ACC. If this fails,
1019 * the originator should retry.
1021 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
1022 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1023 ep = fc_seq_exch(sp);
1024 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
1025 FC_TYPE_ELS, f_ctl, 0);
1026 lport->tt.seq_send(lport, sp, fp);
1027 if (rdata->rp_state == RPORT_ST_PLOGI)
1028 fc_rport_enter_prli(rport);
1034 * fc_rport_recv_prli_req - Handle incoming Process Login (PRLI) request
1035 * @rport: Fibre Channel remote port that initiated PRLI
1036 * @sp: current sequence in the PRLI exchange
1037 * @fp: PRLI request frame
1039 * Locking Note: The rport lock is exected to be held before calling
1042 static void fc_rport_recv_prli_req(struct fc_rport *rport,
1043 struct fc_seq *sp, struct fc_frame *rx_fp)
1045 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1046 struct fc_lport *lport = rdata->local_port;
1048 struct fc_frame *fp;
1049 struct fc_frame_header *fh;
1051 struct fc_els_prli prli;
1052 struct fc_els_spp spp;
1054 struct fc_els_spp *rspp; /* request service param page */
1055 struct fc_els_spp *spp; /* response spp */
1058 enum fc_els_rjt_reason reason = ELS_RJT_UNAB;
1059 enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
1060 enum fc_els_spp_resp resp;
1061 struct fc_seq_els_data rjt_data;
1064 u32 roles = FC_RPORT_ROLE_UNKNOWN;
1067 fh = fc_frame_header_get(rx_fp);
1069 FC_DEBUG_RPORT("Received PRLI request from port (%6x) "
1070 "while in state %s\n", ntoh24(fh->fh_s_id),
1071 fc_rport_state(rport));
1073 switch (rdata->rp_state) {
1075 case RPORT_ST_READY:
1076 reason = ELS_RJT_NONE;
1081 len = fr_len(rx_fp) - sizeof(*fh);
1082 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1084 reason = ELS_RJT_PROT;
1085 explan = ELS_EXPL_INV_LEN;
1087 plen = ntohs(pp->prli.prli_len);
1088 if ((plen % 4) != 0 || plen > len) {
1089 reason = ELS_RJT_PROT;
1090 explan = ELS_EXPL_INV_LEN;
1091 } else if (plen < len) {
1094 plen = pp->prli.prli_spp_len;
1095 if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1096 plen > len || len < sizeof(*pp)) {
1097 reason = ELS_RJT_PROT;
1098 explan = ELS_EXPL_INV_LEN;
1102 if (reason != ELS_RJT_NONE ||
1103 (fp = fc_frame_alloc(lport, len)) == NULL) {
1104 rjt_data.reason = reason;
1105 rjt_data.explan = explan;
1106 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1108 sp = lport->tt.seq_start_next(sp);
1110 pp = fc_frame_payload_get(fp, len);
1113 pp->prli.prli_cmd = ELS_LS_ACC;
1114 pp->prli.prli_spp_len = plen;
1115 pp->prli.prli_len = htons(len);
1116 len -= sizeof(struct fc_els_prli);
1119 * Go through all the service parameter pages and build
1120 * response. If plen indicates longer SPP than standard,
1121 * use that. The entire response has been pre-cleared above.
1124 while (len >= plen) {
1125 spp->spp_type = rspp->spp_type;
1126 spp->spp_type_ext = rspp->spp_type_ext;
1127 spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
1128 resp = FC_SPP_RESP_ACK;
1129 if (rspp->spp_flags & FC_SPP_RPA_VAL)
1130 resp = FC_SPP_RESP_NO_PA;
1131 switch (rspp->spp_type) {
1132 case 0: /* common to all FC-4 types */
1135 fcp_parm = ntohl(rspp->spp_params);
1136 if (fcp_parm * FCP_SPPF_RETRY)
1137 rdata->flags |= FC_RP_FLAGS_RETRY;
1138 rport->supported_classes = FC_COS_CLASS3;
1139 if (fcp_parm & FCP_SPPF_INIT_FCN)
1140 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1141 if (fcp_parm & FCP_SPPF_TARG_FCN)
1142 roles |= FC_RPORT_ROLE_FCP_TARGET;
1143 rport->roles = roles;
1146 htonl(lport->service_params);
1149 resp = FC_SPP_RESP_INVL;
1152 spp->spp_flags |= resp;
1154 rspp = (struct fc_els_spp *)((char *)rspp + plen);
1155 spp = (struct fc_els_spp *)((char *)spp + plen);
1159 * Send LS_ACC. If this fails, the originator should retry.
1161 f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
1162 f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1163 ep = fc_seq_exch(sp);
1164 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
1165 FC_TYPE_ELS, f_ctl, 0);
1166 lport->tt.seq_send(lport, sp, fp);
1169 * Get lock and re-check state.
1171 switch (rdata->rp_state) {
1173 fc_rport_enter_ready(rport);
1175 case RPORT_ST_READY:
1181 fc_frame_free(rx_fp);
1185 * fc_rport_recv_prlo_req - Handle incoming Process Logout (PRLO) request
1186 * @rport: Fibre Channel remote port that initiated PRLO
1187 * @sp: current sequence in the PRLO exchange
1188 * @fp: PRLO request frame
1190 * Locking Note: The rport lock is exected to be held before calling
1193 static void fc_rport_recv_prlo_req(struct fc_rport *rport, struct fc_seq *sp,
1194 struct fc_frame *fp)
1196 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1197 struct fc_lport *lport = rdata->local_port;
1199 struct fc_frame_header *fh;
1200 struct fc_seq_els_data rjt_data;
1202 fh = fc_frame_header_get(fp);
1204 FC_DEBUG_RPORT("Received PRLO request from port (%6x) "
1205 "while in state %s\n", ntoh24(fh->fh_s_id),
1206 fc_rport_state(rport));
1209 rjt_data.reason = ELS_RJT_UNAB;
1210 rjt_data.explan = ELS_EXPL_NONE;
1211 lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
1216 * fc_rport_recv_logo_req - Handle incoming Logout (LOGO) request
1217 * @rport: Fibre Channel remote port that initiated LOGO
1218 * @sp: current sequence in the LOGO exchange
1219 * @fp: LOGO request frame
1221 * Locking Note: The rport lock is exected to be held before calling
1224 static void fc_rport_recv_logo_req(struct fc_rport *rport, struct fc_seq *sp,
1225 struct fc_frame *fp)
1227 struct fc_frame_header *fh;
1228 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1229 struct fc_lport *lport = rdata->local_port;
1231 fh = fc_frame_header_get(fp);
1233 FC_DEBUG_RPORT("Received LOGO request from port (%6x) "
1234 "while in state %s\n", ntoh24(fh->fh_s_id),
1235 fc_rport_state(rport));
1237 rdata->event = RPORT_EV_LOGO;
1238 queue_work(rport_event_queue, &rdata->event_work);
1240 lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
1244 static void fc_rport_flush_queue(void)
1246 flush_workqueue(rport_event_queue);
1250 int fc_rport_init(struct fc_lport *lport)
1252 if (!lport->tt.rport_login)
1253 lport->tt.rport_login = fc_rport_login;
1255 if (!lport->tt.rport_logoff)
1256 lport->tt.rport_logoff = fc_rport_logoff;
1258 if (!lport->tt.rport_recv_req)
1259 lport->tt.rport_recv_req = fc_rport_recv_req;
1261 if (!lport->tt.rport_flush_queue)
1262 lport->tt.rport_flush_queue = fc_rport_flush_queue;
1266 EXPORT_SYMBOL(fc_rport_init);
1268 int fc_setup_rport()
1270 rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
1271 if (!rport_event_queue)
1275 EXPORT_SYMBOL(fc_setup_rport);
1277 void fc_destroy_rport()
1279 destroy_workqueue(rport_event_queue);
1281 EXPORT_SYMBOL(fc_destroy_rport);
1283 void fc_rport_terminate_io(struct fc_rport *rport)
1285 struct fc_rport_libfc_priv *rdata = rport->dd_data;
1286 struct fc_lport *lport = rdata->local_port;
1288 lport->tt.exch_mgr_reset(lport->emp, 0, rport->port_id);
1289 lport->tt.exch_mgr_reset(lport->emp, rport->port_id, 0);
1291 EXPORT_SYMBOL(fc_rport_terminate_io);