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 hierarchy.
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/slab.h>
51 #include <linux/rcupdate.h>
52 #include <linux/timer.h>
53 #include <linux/workqueue.h>
54 #include <asm/unaligned.h>
56 #include <scsi/libfc.h>
57 #include <scsi/fc_encode.h>
61 static struct workqueue_struct *rport_event_queue;
63 static void fc_rport_enter_flogi(struct fc_rport_priv *);
64 static void fc_rport_enter_plogi(struct fc_rport_priv *);
65 static void fc_rport_enter_prli(struct fc_rport_priv *);
66 static void fc_rport_enter_rtv(struct fc_rport_priv *);
67 static void fc_rport_enter_ready(struct fc_rport_priv *);
68 static void fc_rport_enter_logo(struct fc_rport_priv *);
69 static void fc_rport_enter_adisc(struct fc_rport_priv *);
71 static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
72 static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
73 static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
74 static void fc_rport_recv_logo_req(struct fc_lport *, 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_FLOGI] = "FLOGI",
83 [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT",
84 [RPORT_ST_PLOGI] = "PLOGI",
85 [RPORT_ST_PRLI] = "PRLI",
86 [RPORT_ST_RTV] = "RTV",
87 [RPORT_ST_READY] = "Ready",
88 [RPORT_ST_ADISC] = "ADISC",
89 [RPORT_ST_DELETE] = "Delete",
93 * fc_rport_lookup() - Lookup a remote port by port_id
94 * @lport: The local port to lookup the remote port on
95 * @port_id: The remote port ID to look up
97 * The caller must hold either disc_mutex or rcu_read_lock().
99 static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
102 struct fc_rport_priv *rdata;
104 list_for_each_entry_rcu(rdata, &lport->disc.rports, peers)
105 if (rdata->ids.port_id == port_id)
111 * fc_rport_create() - Create a new remote port
112 * @lport: The local port this remote port will be associated with
113 * @ids: The identifiers for the new remote port
115 * The remote port will start in the INIT state.
117 * Locking note: must be called with the disc_mutex held.
119 static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
122 struct fc_rport_priv *rdata;
124 rdata = lport->tt.rport_lookup(lport, port_id);
128 rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL);
132 rdata->ids.node_name = -1;
133 rdata->ids.port_name = -1;
134 rdata->ids.port_id = port_id;
135 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
137 kref_init(&rdata->kref);
138 mutex_init(&rdata->rp_mutex);
139 rdata->local_port = lport;
140 rdata->rp_state = RPORT_ST_INIT;
141 rdata->event = RPORT_EV_NONE;
142 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
143 rdata->e_d_tov = lport->e_d_tov;
144 rdata->r_a_tov = lport->r_a_tov;
145 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
146 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
147 INIT_WORK(&rdata->event_work, fc_rport_work);
148 if (port_id != FC_FID_DIR_SERV) {
149 rdata->lld_event_callback = lport->tt.rport_event_callback;
150 list_add_rcu(&rdata->peers, &lport->disc.rports);
156 * fc_rport_destroy() - Free a remote port after last reference is released
157 * @kref: The remote port's kref
159 static void fc_rport_destroy(struct kref *kref)
161 struct fc_rport_priv *rdata;
163 rdata = container_of(kref, struct fc_rport_priv, kref);
164 kfree_rcu(rdata, rcu);
168 * fc_rport_state() - Return a string identifying the remote port's state
169 * @rdata: The remote port
171 static const char *fc_rport_state(struct fc_rport_priv *rdata)
175 cp = fc_rport_state_names[rdata->rp_state];
182 * fc_set_rport_loss_tmo() - Set the remote port loss timeout
183 * @rport: The remote port that gets a new timeout value
184 * @timeout: The new timeout value (in seconds)
186 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
189 rport->dev_loss_tmo = timeout;
191 rport->dev_loss_tmo = 1;
193 EXPORT_SYMBOL(fc_set_rport_loss_tmo);
196 * fc_plogi_get_maxframe() - Get the maximum payload from the common service
197 * parameters in a FLOGI frame
198 * @flp: The FLOGI or PLOGI payload
199 * @maxval: The maximum frame size upper limit; this may be less than what
200 * is in the service parameters
202 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
208 * Get max payload from the common service parameters and the
209 * class 3 receive data field size.
211 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
212 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
214 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
215 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
221 * fc_rport_state_enter() - Change the state of a remote port
222 * @rdata: The remote port whose state should change
223 * @new: The new state
225 * Locking Note: Called with the rport lock held
227 static void fc_rport_state_enter(struct fc_rport_priv *rdata,
228 enum fc_rport_state new)
230 if (rdata->rp_state != new)
232 rdata->rp_state = new;
236 * fc_rport_work() - Handler for remote port events in the rport_event_queue
237 * @work: Handle to the remote port being dequeued
239 static void fc_rport_work(struct work_struct *work)
242 struct fc_rport_priv *rdata =
243 container_of(work, struct fc_rport_priv, event_work);
244 struct fc_rport_libfc_priv *rpriv;
245 enum fc_rport_event event;
246 struct fc_lport *lport = rdata->local_port;
247 struct fc_rport_operations *rport_ops;
248 struct fc_rport_identifiers ids;
249 struct fc_rport *rport;
250 struct fc4_prov *prov;
253 mutex_lock(&rdata->rp_mutex);
254 event = rdata->event;
255 rport_ops = rdata->ops;
256 rport = rdata->rport;
258 FC_RPORT_DBG(rdata, "work event %u\n", event);
263 rdata->event = RPORT_EV_NONE;
264 rdata->major_retries = 0;
265 kref_get(&rdata->kref);
266 mutex_unlock(&rdata->rp_mutex);
269 rport = fc_remote_port_add(lport->host, 0, &ids);
271 FC_RPORT_DBG(rdata, "Failed to add the rport\n");
272 lport->tt.rport_logoff(rdata);
273 kref_put(&rdata->kref, lport->tt.rport_destroy);
276 mutex_lock(&rdata->rp_mutex);
278 FC_RPORT_DBG(rdata, "rport already allocated\n");
279 rdata->rport = rport;
280 rport->maxframe_size = rdata->maxframe_size;
281 rport->supported_classes = rdata->supported_classes;
283 rpriv = rport->dd_data;
284 rpriv->local_port = lport;
285 rpriv->rp_state = rdata->rp_state;
286 rpriv->flags = rdata->flags;
287 rpriv->e_d_tov = rdata->e_d_tov;
288 rpriv->r_a_tov = rdata->r_a_tov;
289 mutex_unlock(&rdata->rp_mutex);
291 if (rport_ops && rport_ops->event_callback) {
292 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
293 rport_ops->event_callback(lport, rdata, event);
295 if (rdata->lld_event_callback) {
296 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
297 rdata->lld_event_callback(lport, rdata, event);
299 kref_put(&rdata->kref, lport->tt.rport_destroy);
302 case RPORT_EV_FAILED:
305 if (rdata->prli_count) {
306 mutex_lock(&fc_prov_mutex);
307 for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
308 prov = fc_passive_prov[type];
309 if (prov && prov->prlo)
312 mutex_unlock(&fc_prov_mutex);
314 port_id = rdata->ids.port_id;
315 mutex_unlock(&rdata->rp_mutex);
317 if (rport_ops && rport_ops->event_callback) {
318 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
319 rport_ops->event_callback(lport, rdata, event);
321 if (rdata->lld_event_callback) {
322 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
323 rdata->lld_event_callback(lport, rdata, event);
325 cancel_delayed_work_sync(&rdata->retry_work);
328 * Reset any outstanding exchanges before freeing rport.
330 lport->tt.exch_mgr_reset(lport, 0, port_id);
331 lport->tt.exch_mgr_reset(lport, port_id, 0);
334 rpriv = rport->dd_data;
335 rpriv->rp_state = RPORT_ST_DELETE;
336 mutex_lock(&rdata->rp_mutex);
338 mutex_unlock(&rdata->rp_mutex);
339 fc_remote_port_delete(rport);
342 mutex_lock(&lport->disc.disc_mutex);
343 mutex_lock(&rdata->rp_mutex);
344 if (rdata->rp_state == RPORT_ST_DELETE) {
345 if (port_id == FC_FID_DIR_SERV) {
346 rdata->event = RPORT_EV_NONE;
347 mutex_unlock(&rdata->rp_mutex);
348 kref_put(&rdata->kref, lport->tt.rport_destroy);
349 } else if ((rdata->flags & FC_RP_STARTED) &&
350 rdata->major_retries <
351 lport->max_rport_retry_count) {
352 rdata->major_retries++;
353 rdata->event = RPORT_EV_NONE;
354 FC_RPORT_DBG(rdata, "work restart\n");
355 fc_rport_enter_flogi(rdata);
356 mutex_unlock(&rdata->rp_mutex);
358 FC_RPORT_DBG(rdata, "work delete\n");
359 list_del_rcu(&rdata->peers);
360 mutex_unlock(&rdata->rp_mutex);
361 kref_put(&rdata->kref, lport->tt.rport_destroy);
365 * Re-open for events. Reissue READY event if ready.
367 rdata->event = RPORT_EV_NONE;
368 if (rdata->rp_state == RPORT_ST_READY)
369 fc_rport_enter_ready(rdata);
370 mutex_unlock(&rdata->rp_mutex);
372 mutex_unlock(&lport->disc.disc_mutex);
376 mutex_unlock(&rdata->rp_mutex);
382 * fc_rport_login() - Start the remote port login state machine
383 * @rdata: The remote port to be logged in to
385 * Locking Note: Called without the rport lock held. This
386 * function will hold the rport lock, call an _enter_*
387 * function and then unlock the rport.
389 * This indicates the intent to be logged into the remote port.
390 * If it appears we are already logged in, ADISC is used to verify
393 int fc_rport_login(struct fc_rport_priv *rdata)
395 mutex_lock(&rdata->rp_mutex);
397 rdata->flags |= FC_RP_STARTED;
398 switch (rdata->rp_state) {
400 FC_RPORT_DBG(rdata, "ADISC port\n");
401 fc_rport_enter_adisc(rdata);
403 case RPORT_ST_DELETE:
404 FC_RPORT_DBG(rdata, "Restart deleted port\n");
407 FC_RPORT_DBG(rdata, "Login to port\n");
408 fc_rport_enter_flogi(rdata);
411 mutex_unlock(&rdata->rp_mutex);
417 * fc_rport_enter_delete() - Schedule a remote port to be deleted
418 * @rdata: The remote port to be deleted
419 * @event: The event to report as the reason for deletion
421 * Locking Note: Called with the rport lock held.
423 * Allow state change into DELETE only once.
425 * Call queue_work only if there's no event already pending.
426 * Set the new event so that the old pending event will not occur.
427 * Since we have the mutex, even if fc_rport_work() is already started,
428 * it'll see the new event.
430 static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
431 enum fc_rport_event event)
433 if (rdata->rp_state == RPORT_ST_DELETE)
436 FC_RPORT_DBG(rdata, "Delete port\n");
438 fc_rport_state_enter(rdata, RPORT_ST_DELETE);
440 if (rdata->event == RPORT_EV_NONE)
441 queue_work(rport_event_queue, &rdata->event_work);
442 rdata->event = event;
446 * fc_rport_logoff() - Logoff and remove a remote port
447 * @rdata: The remote port to be logged off of
449 * Locking Note: Called without the rport lock held. This
450 * function will hold the rport lock, call an _enter_*
451 * function and then unlock the rport.
453 int fc_rport_logoff(struct fc_rport_priv *rdata)
455 mutex_lock(&rdata->rp_mutex);
457 FC_RPORT_DBG(rdata, "Remove port\n");
459 rdata->flags &= ~FC_RP_STARTED;
460 if (rdata->rp_state == RPORT_ST_DELETE) {
461 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
464 fc_rport_enter_logo(rdata);
467 * Change the state to Delete so that we discard
470 fc_rport_enter_delete(rdata, RPORT_EV_STOP);
472 mutex_unlock(&rdata->rp_mutex);
477 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
478 * @rdata: The remote port that is ready
480 * Locking Note: The rport lock is expected to be held before calling
483 static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
485 fc_rport_state_enter(rdata, RPORT_ST_READY);
487 FC_RPORT_DBG(rdata, "Port is Ready\n");
489 if (rdata->event == RPORT_EV_NONE)
490 queue_work(rport_event_queue, &rdata->event_work);
491 rdata->event = RPORT_EV_READY;
495 * fc_rport_timeout() - Handler for the retry_work timer
496 * @work: Handle to the remote port that has timed out
498 * Locking Note: Called without the rport lock held. This
499 * function will hold the rport lock, call an _enter_*
500 * function and then unlock the rport.
502 static void fc_rport_timeout(struct work_struct *work)
504 struct fc_rport_priv *rdata =
505 container_of(work, struct fc_rport_priv, retry_work.work);
507 mutex_lock(&rdata->rp_mutex);
509 switch (rdata->rp_state) {
511 fc_rport_enter_flogi(rdata);
514 fc_rport_enter_plogi(rdata);
517 fc_rport_enter_prli(rdata);
520 fc_rport_enter_rtv(rdata);
523 fc_rport_enter_adisc(rdata);
525 case RPORT_ST_PLOGI_WAIT:
528 case RPORT_ST_DELETE:
532 mutex_unlock(&rdata->rp_mutex);
536 * fc_rport_error() - Error handler, called once retries have been exhausted
537 * @rdata: The remote port the error is happened on
538 * @fp: The error code encapsulated in a frame pointer
540 * Locking Note: The rport lock is expected to be held before
541 * calling this routine
543 static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp)
545 FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n",
546 IS_ERR(fp) ? -PTR_ERR(fp) : 0,
547 fc_rport_state(rdata), rdata->retries);
549 switch (rdata->rp_state) {
552 rdata->flags &= ~FC_RP_STARTED;
553 fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
556 fc_rport_enter_ready(rdata);
560 fc_rport_enter_logo(rdata);
562 case RPORT_ST_PLOGI_WAIT:
563 case RPORT_ST_DELETE:
571 * fc_rport_error_retry() - Handler for remote port state retries
572 * @rdata: The remote port whose state is to be retried
573 * @fp: The error code encapsulated in a frame pointer
575 * If the error was an exchange timeout retry immediately,
576 * otherwise wait for E_D_TOV.
578 * Locking Note: The rport lock is expected to be held before
579 * calling this routine
581 static void fc_rport_error_retry(struct fc_rport_priv *rdata,
584 unsigned long delay = FC_DEF_E_D_TOV;
586 /* make sure this isn't an FC_EX_CLOSED error, never retry those */
587 if (PTR_ERR(fp) == -FC_EX_CLOSED)
590 if (rdata->retries < rdata->local_port->max_rport_retry_count) {
591 FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n",
592 PTR_ERR(fp), fc_rport_state(rdata));
594 /* no additional delay on exchange timeouts */
595 if (PTR_ERR(fp) == -FC_EX_TIMEOUT)
597 schedule_delayed_work(&rdata->retry_work, delay);
602 fc_rport_error(rdata, fp);
606 * fc_rport_login_complete() - Handle parameters and completion of p-mp login.
607 * @rdata: The remote port which we logged into or which logged into us.
608 * @fp: The FLOGI or PLOGI request or response frame
610 * Returns non-zero error if a problem is detected with the frame.
611 * Does not free the frame.
613 * This is only used in point-to-multipoint mode for FIP currently.
615 static int fc_rport_login_complete(struct fc_rport_priv *rdata,
618 struct fc_lport *lport = rdata->local_port;
619 struct fc_els_flogi *flogi;
620 unsigned int e_d_tov;
623 flogi = fc_frame_payload_get(fp, sizeof(*flogi));
627 csp_flags = ntohs(flogi->fl_csp.sp_features);
629 if (fc_frame_payload_op(fp) == ELS_FLOGI) {
630 if (csp_flags & FC_SP_FT_FPORT) {
631 FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n");
637 * E_D_TOV is not valid on an incoming FLOGI request.
639 e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov);
640 if (csp_flags & FC_SP_FT_EDTR)
642 if (e_d_tov > rdata->e_d_tov)
643 rdata->e_d_tov = e_d_tov;
645 rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs);
650 * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode
651 * @sp: The sequence that the FLOGI was on
652 * @fp: The FLOGI response frame
653 * @rp_arg: The remote port that received the FLOGI response
655 void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
658 struct fc_rport_priv *rdata = rp_arg;
659 struct fc_lport *lport = rdata->local_port;
660 struct fc_els_flogi *flogi;
661 unsigned int r_a_tov;
663 FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", fc_els_resp_type(fp));
665 if (fp == ERR_PTR(-FC_EX_CLOSED))
668 mutex_lock(&rdata->rp_mutex);
670 if (rdata->rp_state != RPORT_ST_FLOGI) {
671 FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state "
672 "%s\n", fc_rport_state(rdata));
679 fc_rport_error(rdata, fp);
683 if (fc_frame_payload_op(fp) != ELS_LS_ACC)
685 if (fc_rport_login_complete(rdata, fp))
688 flogi = fc_frame_payload_get(fp, sizeof(*flogi));
691 r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
692 if (r_a_tov > rdata->r_a_tov)
693 rdata->r_a_tov = r_a_tov;
695 if (rdata->ids.port_name < lport->wwpn)
696 fc_rport_enter_plogi(rdata);
698 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
702 mutex_unlock(&rdata->rp_mutex);
704 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
707 FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
708 fc_rport_error_retry(rdata, fp);
713 * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp
714 * @rdata: The remote port to send a FLOGI to
716 * Locking Note: The rport lock is expected to be held before calling
719 static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
721 struct fc_lport *lport = rdata->local_port;
724 if (!lport->point_to_multipoint)
725 return fc_rport_enter_plogi(rdata);
727 FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n",
728 fc_rport_state(rdata));
730 fc_rport_state_enter(rdata, RPORT_ST_FLOGI);
732 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
734 return fc_rport_error_retry(rdata, fp);
736 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI,
737 fc_rport_flogi_resp, rdata,
739 fc_rport_error_retry(rdata, NULL);
741 kref_get(&rdata->kref);
745 * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode
746 * @lport: The local port that received the PLOGI request
747 * @rx_fp: The PLOGI request frame
749 static void fc_rport_recv_flogi_req(struct fc_lport *lport,
750 struct fc_frame *rx_fp)
752 struct fc_disc *disc;
753 struct fc_els_flogi *flp;
754 struct fc_rport_priv *rdata;
755 struct fc_frame *fp = rx_fp;
756 struct fc_seq_els_data rjt_data;
759 sid = fc_frame_sid(fp);
761 FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
764 mutex_lock(&disc->disc_mutex);
766 if (!lport->point_to_multipoint) {
767 rjt_data.reason = ELS_RJT_UNSUP;
768 rjt_data.explan = ELS_EXPL_NONE;
772 flp = fc_frame_payload_get(fp, sizeof(*flp));
774 rjt_data.reason = ELS_RJT_LOGIC;
775 rjt_data.explan = ELS_EXPL_INV_LEN;
779 rdata = lport->tt.rport_lookup(lport, sid);
781 rjt_data.reason = ELS_RJT_FIP;
782 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
785 mutex_lock(&rdata->rp_mutex);
787 FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
788 fc_rport_state(rdata));
790 switch (rdata->rp_state) {
792 case RPORT_ST_DELETE:
793 mutex_unlock(&rdata->rp_mutex);
794 rjt_data.reason = ELS_RJT_FIP;
795 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
798 case RPORT_ST_PLOGI_WAIT:
806 * Set the remote port to be deleted and to then restart.
807 * This queues work to be sure exchanges are reset.
809 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
810 mutex_unlock(&rdata->rp_mutex);
811 rjt_data.reason = ELS_RJT_BUSY;
812 rjt_data.explan = ELS_EXPL_NONE;
815 if (fc_rport_login_complete(rdata, fp)) {
816 mutex_unlock(&rdata->rp_mutex);
817 rjt_data.reason = ELS_RJT_LOGIC;
818 rjt_data.explan = ELS_EXPL_NONE;
822 fp = fc_frame_alloc(lport, sizeof(*flp));
826 fc_flogi_fill(lport, fp);
827 flp = fc_frame_payload_get(fp, sizeof(*flp));
828 flp->fl_cmd = ELS_LS_ACC;
830 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
831 lport->tt.frame_send(lport, fp);
833 if (rdata->ids.port_name < lport->wwpn)
834 fc_rport_enter_plogi(rdata);
836 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
838 mutex_unlock(&rdata->rp_mutex);
839 mutex_unlock(&disc->disc_mutex);
840 fc_frame_free(rx_fp);
844 mutex_unlock(&disc->disc_mutex);
845 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
846 fc_frame_free(rx_fp);
850 * fc_rport_plogi_resp() - Handler for ELS PLOGI responses
851 * @sp: The sequence the PLOGI is on
852 * @fp: The PLOGI response frame
853 * @rdata_arg: The remote port that sent the PLOGI response
855 * Locking Note: This function will be called without the rport lock
856 * held, but it will lock, call an _enter_* function or fc_rport_error
857 * and then unlock the rport.
859 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
862 struct fc_rport_priv *rdata = rdata_arg;
863 struct fc_lport *lport = rdata->local_port;
864 struct fc_els_flogi *plp = NULL;
869 mutex_lock(&rdata->rp_mutex);
871 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
873 if (rdata->rp_state != RPORT_ST_PLOGI) {
874 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
875 "%s\n", fc_rport_state(rdata));
882 fc_rport_error_retry(rdata, fp);
886 op = fc_frame_payload_op(fp);
887 if (op == ELS_LS_ACC &&
888 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
889 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
890 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn);
892 /* save plogi response sp_features for further reference */
893 rdata->sp_features = ntohs(plp->fl_csp.sp_features);
895 if (lport->point_to_multipoint)
896 fc_rport_login_complete(rdata, fp);
897 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
898 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
899 if (cssp_seq < csp_seq)
901 rdata->max_seq = csp_seq;
902 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs);
903 fc_rport_enter_prli(rdata);
905 fc_rport_error_retry(rdata, fp);
910 mutex_unlock(&rdata->rp_mutex);
911 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
915 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request
916 * @rdata: The remote port to send a PLOGI to
918 * Locking Note: The rport lock is expected to be held before calling
921 static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
923 struct fc_lport *lport = rdata->local_port;
926 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
927 fc_rport_state(rdata));
929 fc_rport_state_enter(rdata, RPORT_ST_PLOGI);
931 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
932 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
934 FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__);
935 fc_rport_error_retry(rdata, fp);
938 rdata->e_d_tov = lport->e_d_tov;
940 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
941 fc_rport_plogi_resp, rdata,
943 fc_rport_error_retry(rdata, NULL);
945 kref_get(&rdata->kref);
949 * fc_rport_prli_resp() - Process Login (PRLI) response handler
950 * @sp: The sequence the PRLI response was on
951 * @fp: The PRLI response frame
952 * @rdata_arg: The remote port that sent the PRLI response
954 * Locking Note: This function will be called without the rport lock
955 * held, but it will lock, call an _enter_* function or fc_rport_error
956 * and then unlock the rport.
958 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
961 struct fc_rport_priv *rdata = rdata_arg;
963 struct fc_els_prli prli;
964 struct fc_els_spp spp;
966 struct fc_els_spp temp_spp;
967 struct fc4_prov *prov;
968 u32 roles = FC_RPORT_ROLE_UNKNOWN;
973 mutex_lock(&rdata->rp_mutex);
975 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
977 if (rdata->rp_state != RPORT_ST_PRLI) {
978 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
979 "%s\n", fc_rport_state(rdata));
986 fc_rport_error_retry(rdata, fp);
990 /* reinitialize remote port roles */
991 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
993 op = fc_frame_payload_op(fp);
994 if (op == ELS_LS_ACC) {
995 pp = fc_frame_payload_get(fp, sizeof(*pp));
999 resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
1000 FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n",
1002 rdata->spp_type = pp->spp.spp_type;
1003 if (resp_code != FC_SPP_RESP_ACK) {
1004 if (resp_code == FC_SPP_RESP_CONF)
1005 fc_rport_error(rdata, fp);
1007 fc_rport_error_retry(rdata, fp);
1010 if (pp->prli.prli_spp_len < sizeof(pp->spp))
1013 fcp_parm = ntohl(pp->spp.spp_params);
1014 if (fcp_parm & FCP_SPPF_RETRY)
1015 rdata->flags |= FC_RP_FLAGS_RETRY;
1016 if (fcp_parm & FCP_SPPF_CONF_COMPL)
1017 rdata->flags |= FC_RP_FLAGS_CONF_REQ;
1019 prov = fc_passive_prov[FC_TYPE_FCP];
1021 memset(&temp_spp, 0, sizeof(temp_spp));
1022 prov->prli(rdata, pp->prli.prli_spp_len,
1023 &pp->spp, &temp_spp);
1026 rdata->supported_classes = FC_COS_CLASS3;
1027 if (fcp_parm & FCP_SPPF_INIT_FCN)
1028 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1029 if (fcp_parm & FCP_SPPF_TARG_FCN)
1030 roles |= FC_RPORT_ROLE_FCP_TARGET;
1032 rdata->ids.roles = roles;
1033 fc_rport_enter_rtv(rdata);
1036 FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n");
1037 fc_rport_error_retry(rdata, fp);
1043 mutex_unlock(&rdata->rp_mutex);
1044 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1048 * fc_rport_enter_prli() - Send Process Login (PRLI) request
1049 * @rdata: The remote port to send the PRLI request to
1051 * Locking Note: The rport lock is expected to be held before calling
1054 static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
1056 struct fc_lport *lport = rdata->local_port;
1058 struct fc_els_prli prli;
1059 struct fc_els_spp spp;
1061 struct fc_frame *fp;
1062 struct fc4_prov *prov;
1065 * If the rport is one of the well known addresses
1066 * we skip PRLI and RTV and go straight to READY.
1068 if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
1069 fc_rport_enter_ready(rdata);
1073 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
1074 fc_rport_state(rdata));
1076 fc_rport_state_enter(rdata, RPORT_ST_PRLI);
1078 fp = fc_frame_alloc(lport, sizeof(*pp));
1080 fc_rport_error_retry(rdata, fp);
1084 fc_prli_fill(lport, fp);
1086 prov = fc_passive_prov[FC_TYPE_FCP];
1088 pp = fc_frame_payload_get(fp, sizeof(*pp));
1089 prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
1092 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id,
1093 fc_host_port_id(lport->host), FC_TYPE_ELS,
1094 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1096 if (!lport->tt.exch_seq_send(lport, fp, fc_rport_prli_resp,
1097 NULL, rdata, 2 * lport->r_a_tov))
1098 fc_rport_error_retry(rdata, NULL);
1100 kref_get(&rdata->kref);
1104 * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses
1105 * @sp: The sequence the RTV was on
1106 * @fp: The RTV response frame
1107 * @rdata_arg: The remote port that sent the RTV response
1109 * Many targets don't seem to support this.
1111 * Locking Note: This function will be called without the rport lock
1112 * held, but it will lock, call an _enter_* function or fc_rport_error
1113 * and then unlock the rport.
1115 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
1118 struct fc_rport_priv *rdata = rdata_arg;
1121 mutex_lock(&rdata->rp_mutex);
1123 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
1125 if (rdata->rp_state != RPORT_ST_RTV) {
1126 FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
1127 "%s\n", fc_rport_state(rdata));
1134 fc_rport_error(rdata, fp);
1138 op = fc_frame_payload_op(fp);
1139 if (op == ELS_LS_ACC) {
1140 struct fc_els_rtv_acc *rtv;
1144 rtv = fc_frame_payload_get(fp, sizeof(*rtv));
1146 toq = ntohl(rtv->rtv_toq);
1147 tov = ntohl(rtv->rtv_r_a_tov);
1150 rdata->r_a_tov = tov;
1151 tov = ntohl(rtv->rtv_e_d_tov);
1152 if (toq & FC_ELS_RTV_EDRES)
1156 rdata->e_d_tov = tov;
1160 fc_rport_enter_ready(rdata);
1165 mutex_unlock(&rdata->rp_mutex);
1166 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1170 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request
1171 * @rdata: The remote port to send the RTV request to
1173 * Locking Note: The rport lock is expected to be held before calling
1176 static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
1178 struct fc_frame *fp;
1179 struct fc_lport *lport = rdata->local_port;
1181 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
1182 fc_rport_state(rdata));
1184 fc_rport_state_enter(rdata, RPORT_ST_RTV);
1186 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
1188 fc_rport_error_retry(rdata, fp);
1192 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
1193 fc_rport_rtv_resp, rdata,
1194 2 * lport->r_a_tov))
1195 fc_rport_error_retry(rdata, NULL);
1197 kref_get(&rdata->kref);
1201 * fc_rport_logo_resp() - Handler for logout (LOGO) responses
1202 * @sp: The sequence the LOGO was on
1203 * @fp: The LOGO response frame
1204 * @lport_arg: The local port
1206 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1209 struct fc_lport *lport = lport_arg;
1211 FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
1212 "Received a LOGO %s\n", fc_els_resp_type(fp));
1219 * fc_rport_enter_logo() - Send a logout (LOGO) request
1220 * @rdata: The remote port to send the LOGO request to
1222 * Locking Note: The rport lock is expected to be held before calling
1225 static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
1227 struct fc_lport *lport = rdata->local_port;
1228 struct fc_frame *fp;
1230 FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
1231 fc_rport_state(rdata));
1233 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
1236 (void)lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
1237 fc_rport_logo_resp, lport, 0);
1241 * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses
1242 * @sp: The sequence the ADISC response was on
1243 * @fp: The ADISC response frame
1244 * @rdata_arg: The remote port that sent the ADISC response
1246 * Locking Note: This function will be called without the rport lock
1247 * held, but it will lock, call an _enter_* function or fc_rport_error
1248 * and then unlock the rport.
1250 static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
1253 struct fc_rport_priv *rdata = rdata_arg;
1254 struct fc_els_adisc *adisc;
1257 mutex_lock(&rdata->rp_mutex);
1259 FC_RPORT_DBG(rdata, "Received a ADISC response\n");
1261 if (rdata->rp_state != RPORT_ST_ADISC) {
1262 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
1263 fc_rport_state(rdata));
1270 fc_rport_error(rdata, fp);
1275 * If address verification failed. Consider us logged out of the rport.
1276 * Since the rport is still in discovery, we want to be
1277 * logged in, so go to PLOGI state. Otherwise, go back to READY.
1279 op = fc_frame_payload_op(fp);
1280 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1281 if (op != ELS_LS_ACC || !adisc ||
1282 ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
1283 get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
1284 get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) {
1285 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
1286 fc_rport_enter_flogi(rdata);
1288 FC_RPORT_DBG(rdata, "ADISC OK\n");
1289 fc_rport_enter_ready(rdata);
1294 mutex_unlock(&rdata->rp_mutex);
1295 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1299 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request
1300 * @rdata: The remote port to send the ADISC request to
1302 * Locking Note: The rport lock is expected to be held before calling
1305 static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
1307 struct fc_lport *lport = rdata->local_port;
1308 struct fc_frame *fp;
1310 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
1311 fc_rport_state(rdata));
1313 fc_rport_state_enter(rdata, RPORT_ST_ADISC);
1315 fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
1317 fc_rport_error_retry(rdata, fp);
1320 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
1321 fc_rport_adisc_resp, rdata,
1322 2 * lport->r_a_tov))
1323 fc_rport_error_retry(rdata, NULL);
1325 kref_get(&rdata->kref);
1329 * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests
1330 * @rdata: The remote port that sent the ADISC request
1331 * @in_fp: The ADISC request frame
1333 * Locking Note: Called with the lport and rport locks held.
1335 static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
1336 struct fc_frame *in_fp)
1338 struct fc_lport *lport = rdata->local_port;
1339 struct fc_frame *fp;
1340 struct fc_els_adisc *adisc;
1341 struct fc_seq_els_data rjt_data;
1343 FC_RPORT_DBG(rdata, "Received ADISC request\n");
1345 adisc = fc_frame_payload_get(in_fp, sizeof(*adisc));
1347 rjt_data.reason = ELS_RJT_PROT;
1348 rjt_data.explan = ELS_EXPL_INV_LEN;
1349 lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
1353 fp = fc_frame_alloc(lport, sizeof(*adisc));
1356 fc_adisc_fill(lport, fp);
1357 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1358 adisc->adisc_cmd = ELS_LS_ACC;
1359 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
1360 lport->tt.frame_send(lport, fp);
1362 fc_frame_free(in_fp);
1366 * fc_rport_recv_rls_req() - Handle received Read Link Status request
1367 * @rdata: The remote port that sent the RLS request
1368 * @rx_fp: The PRLI request frame
1370 * Locking Note: The rport lock is expected to be held before calling
1373 static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
1374 struct fc_frame *rx_fp)
1377 struct fc_lport *lport = rdata->local_port;
1378 struct fc_frame *fp;
1379 struct fc_els_rls *rls;
1380 struct fc_els_rls_resp *rsp;
1381 struct fc_els_lesb *lesb;
1382 struct fc_seq_els_data rjt_data;
1383 struct fc_host_statistics *hst;
1385 FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
1386 fc_rport_state(rdata));
1388 rls = fc_frame_payload_get(rx_fp, sizeof(*rls));
1390 rjt_data.reason = ELS_RJT_PROT;
1391 rjt_data.explan = ELS_EXPL_INV_LEN;
1395 fp = fc_frame_alloc(lport, sizeof(*rsp));
1397 rjt_data.reason = ELS_RJT_UNAB;
1398 rjt_data.explan = ELS_EXPL_INSUF_RES;
1402 rsp = fc_frame_payload_get(fp, sizeof(*rsp));
1403 memset(rsp, 0, sizeof(*rsp));
1404 rsp->rls_cmd = ELS_LS_ACC;
1405 lesb = &rsp->rls_lesb;
1406 if (lport->tt.get_lesb) {
1407 /* get LESB from LLD if it supports it */
1408 lport->tt.get_lesb(lport, lesb);
1410 fc_get_host_stats(lport->host);
1411 hst = &lport->host_stats;
1412 lesb->lesb_link_fail = htonl(hst->link_failure_count);
1413 lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
1414 lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
1415 lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
1416 lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
1417 lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
1420 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1421 lport->tt.frame_send(lport, fp);
1425 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1427 fc_frame_free(rx_fp);
1431 * fc_rport_recv_els_req() - Handler for validated ELS requests
1432 * @lport: The local port that received the ELS request
1433 * @fp: The ELS request frame
1435 * Handle incoming ELS requests that require port login.
1436 * The ELS opcode has already been validated by the caller.
1438 * Locking Note: Called with the lport lock held.
1440 static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp)
1442 struct fc_rport_priv *rdata;
1443 struct fc_seq_els_data els_data;
1445 mutex_lock(&lport->disc.disc_mutex);
1446 rdata = lport->tt.rport_lookup(lport, fc_frame_sid(fp));
1448 mutex_unlock(&lport->disc.disc_mutex);
1451 mutex_lock(&rdata->rp_mutex);
1452 mutex_unlock(&lport->disc.disc_mutex);
1454 switch (rdata->rp_state) {
1457 case RPORT_ST_READY:
1458 case RPORT_ST_ADISC:
1461 mutex_unlock(&rdata->rp_mutex);
1465 switch (fc_frame_payload_op(fp)) {
1467 fc_rport_recv_prli_req(rdata, fp);
1470 fc_rport_recv_prlo_req(rdata, fp);
1473 fc_rport_recv_adisc_req(rdata, fp);
1476 lport->tt.seq_els_rsp_send(fp, ELS_RRQ, NULL);
1480 lport->tt.seq_els_rsp_send(fp, ELS_REC, NULL);
1484 fc_rport_recv_rls_req(rdata, fp);
1487 fc_frame_free(fp); /* can't happen */
1491 mutex_unlock(&rdata->rp_mutex);
1495 els_data.reason = ELS_RJT_UNAB;
1496 els_data.explan = ELS_EXPL_PLOGI_REQD;
1497 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1502 * fc_rport_recv_req() - Handler for requests
1503 * @lport: The local port that received the request
1504 * @fp: The request frame
1506 * Locking Note: Called with the lport lock held.
1508 void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp)
1510 struct fc_seq_els_data els_data;
1513 * Handle FLOGI, PLOGI and LOGO requests separately, since they
1514 * don't require prior login.
1515 * Check for unsupported opcodes first and reject them.
1516 * For some ops, it would be incorrect to reject with "PLOGI required".
1518 switch (fc_frame_payload_op(fp)) {
1520 fc_rport_recv_flogi_req(lport, fp);
1523 fc_rport_recv_plogi_req(lport, fp);
1526 fc_rport_recv_logo_req(lport, fp);
1534 fc_rport_recv_els_req(lport, fp);
1537 els_data.reason = ELS_RJT_UNSUP;
1538 els_data.explan = ELS_EXPL_NONE;
1539 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1546 * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests
1547 * @lport: The local port that received the PLOGI request
1548 * @rx_fp: The PLOGI request frame
1550 * Locking Note: The rport lock is held before calling this function.
1552 static void fc_rport_recv_plogi_req(struct fc_lport *lport,
1553 struct fc_frame *rx_fp)
1555 struct fc_disc *disc;
1556 struct fc_rport_priv *rdata;
1557 struct fc_frame *fp = rx_fp;
1558 struct fc_els_flogi *pl;
1559 struct fc_seq_els_data rjt_data;
1562 sid = fc_frame_sid(fp);
1564 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
1566 pl = fc_frame_payload_get(fp, sizeof(*pl));
1568 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
1569 rjt_data.reason = ELS_RJT_PROT;
1570 rjt_data.explan = ELS_EXPL_INV_LEN;
1574 disc = &lport->disc;
1575 mutex_lock(&disc->disc_mutex);
1576 rdata = lport->tt.rport_create(lport, sid);
1578 mutex_unlock(&disc->disc_mutex);
1579 rjt_data.reason = ELS_RJT_UNAB;
1580 rjt_data.explan = ELS_EXPL_INSUF_RES;
1584 mutex_lock(&rdata->rp_mutex);
1585 mutex_unlock(&disc->disc_mutex);
1587 rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
1588 rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn);
1591 * If the rport was just created, possibly due to the incoming PLOGI,
1592 * set the state appropriately and accept the PLOGI.
1594 * If we had also sent a PLOGI, and if the received PLOGI is from a
1595 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
1596 * "command already in progress".
1598 * XXX TBD: If the session was ready before, the PLOGI should result in
1599 * all outstanding exchanges being reset.
1601 switch (rdata->rp_state) {
1603 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
1605 case RPORT_ST_PLOGI_WAIT:
1606 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n");
1608 case RPORT_ST_PLOGI:
1609 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
1610 if (rdata->ids.port_name < lport->wwpn) {
1611 mutex_unlock(&rdata->rp_mutex);
1612 rjt_data.reason = ELS_RJT_INPROG;
1613 rjt_data.explan = ELS_EXPL_NONE;
1619 case RPORT_ST_READY:
1620 case RPORT_ST_ADISC:
1621 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
1622 "- ignored for now\n", rdata->rp_state);
1623 /* XXX TBD - should reset */
1625 case RPORT_ST_FLOGI:
1626 case RPORT_ST_DELETE:
1627 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
1628 fc_rport_state(rdata));
1629 mutex_unlock(&rdata->rp_mutex);
1630 rjt_data.reason = ELS_RJT_BUSY;
1631 rjt_data.explan = ELS_EXPL_NONE;
1636 * Get session payload size from incoming PLOGI.
1638 rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
1641 * Send LS_ACC. If this fails, the originator should retry.
1643 fp = fc_frame_alloc(lport, sizeof(*pl));
1647 fc_plogi_fill(lport, fp, ELS_LS_ACC);
1648 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1649 lport->tt.frame_send(lport, fp);
1650 fc_rport_enter_prli(rdata);
1652 mutex_unlock(&rdata->rp_mutex);
1653 fc_frame_free(rx_fp);
1657 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
1662 * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests
1663 * @rdata: The remote port that sent the PRLI request
1664 * @rx_fp: The PRLI request frame
1666 * Locking Note: The rport lock is exected to be held before calling
1669 static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
1670 struct fc_frame *rx_fp)
1672 struct fc_lport *lport = rdata->local_port;
1673 struct fc_frame *fp;
1675 struct fc_els_prli prli;
1676 struct fc_els_spp spp;
1678 struct fc_els_spp *rspp; /* request service param page */
1679 struct fc_els_spp *spp; /* response spp */
1682 enum fc_els_spp_resp resp;
1683 enum fc_els_spp_resp passive;
1684 struct fc_seq_els_data rjt_data;
1685 struct fc4_prov *prov;
1687 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
1688 fc_rport_state(rdata));
1690 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1691 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1694 plen = ntohs(pp->prli.prli_len);
1695 if ((plen % 4) != 0 || plen > len || plen < 16)
1699 plen = pp->prli.prli_spp_len;
1700 if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1701 plen > len || len < sizeof(*pp) || plen < 12)
1705 fp = fc_frame_alloc(lport, len);
1707 rjt_data.reason = ELS_RJT_UNAB;
1708 rjt_data.explan = ELS_EXPL_INSUF_RES;
1711 pp = fc_frame_payload_get(fp, len);
1714 pp->prli.prli_cmd = ELS_LS_ACC;
1715 pp->prli.prli_spp_len = plen;
1716 pp->prli.prli_len = htons(len);
1717 len -= sizeof(struct fc_els_prli);
1720 * Go through all the service parameter pages and build
1721 * response. If plen indicates longer SPP than standard,
1722 * use that. The entire response has been pre-cleared above.
1725 mutex_lock(&fc_prov_mutex);
1726 while (len >= plen) {
1727 rdata->spp_type = rspp->spp_type;
1728 spp->spp_type = rspp->spp_type;
1729 spp->spp_type_ext = rspp->spp_type_ext;
1732 if (rspp->spp_type < FC_FC4_PROV_SIZE) {
1733 prov = fc_active_prov[rspp->spp_type];
1735 resp = prov->prli(rdata, plen, rspp, spp);
1736 prov = fc_passive_prov[rspp->spp_type];
1738 passive = prov->prli(rdata, plen, rspp, spp);
1739 if (!resp || passive == FC_SPP_RESP_ACK)
1744 if (spp->spp_flags & FC_SPP_EST_IMG_PAIR)
1745 resp |= FC_SPP_RESP_CONF;
1747 resp |= FC_SPP_RESP_INVL;
1749 spp->spp_flags |= resp;
1751 rspp = (struct fc_els_spp *)((char *)rspp + plen);
1752 spp = (struct fc_els_spp *)((char *)spp + plen);
1754 mutex_unlock(&fc_prov_mutex);
1757 * Send LS_ACC. If this fails, the originator should retry.
1759 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1760 lport->tt.frame_send(lport, fp);
1762 switch (rdata->rp_state) {
1764 fc_rport_enter_ready(rdata);
1772 rjt_data.reason = ELS_RJT_PROT;
1773 rjt_data.explan = ELS_EXPL_INV_LEN;
1775 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1777 fc_frame_free(rx_fp);
1781 * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
1782 * @rdata: The remote port that sent the PRLO request
1783 * @rx_fp: The PRLO request frame
1785 * Locking Note: The rport lock is exected to be held before calling
1788 static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
1789 struct fc_frame *rx_fp)
1791 struct fc_lport *lport = rdata->local_port;
1792 struct fc_frame *fp;
1794 struct fc_els_prlo prlo;
1795 struct fc_els_spp spp;
1797 struct fc_els_spp *rspp; /* request service param page */
1798 struct fc_els_spp *spp; /* response spp */
1801 struct fc_seq_els_data rjt_data;
1803 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
1804 fc_rport_state(rdata));
1806 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1807 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1810 plen = ntohs(pp->prlo.prlo_len);
1818 fp = fc_frame_alloc(lport, len);
1820 rjt_data.reason = ELS_RJT_UNAB;
1821 rjt_data.explan = ELS_EXPL_INSUF_RES;
1825 pp = fc_frame_payload_get(fp, len);
1828 pp->prlo.prlo_cmd = ELS_LS_ACC;
1829 pp->prlo.prlo_obs = 0x10;
1830 pp->prlo.prlo_len = htons(len);
1832 spp->spp_type = rspp->spp_type;
1833 spp->spp_type_ext = rspp->spp_type_ext;
1834 spp->spp_flags = FC_SPP_RESP_ACK;
1836 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
1838 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1839 lport->tt.frame_send(lport, fp);
1843 rjt_data.reason = ELS_RJT_PROT;
1844 rjt_data.explan = ELS_EXPL_INV_LEN;
1846 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1848 fc_frame_free(rx_fp);
1852 * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests
1853 * @lport: The local port that received the LOGO request
1854 * @fp: The LOGO request frame
1856 * Locking Note: The rport lock is exected to be held before calling
1859 static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
1861 struct fc_rport_priv *rdata;
1864 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
1866 sid = fc_frame_sid(fp);
1868 mutex_lock(&lport->disc.disc_mutex);
1869 rdata = lport->tt.rport_lookup(lport, sid);
1871 mutex_lock(&rdata->rp_mutex);
1872 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
1873 fc_rport_state(rdata));
1875 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
1876 mutex_unlock(&rdata->rp_mutex);
1878 FC_RPORT_ID_DBG(lport, sid,
1879 "Received LOGO from non-logged-in port\n");
1880 mutex_unlock(&lport->disc.disc_mutex);
1885 * fc_rport_flush_queue() - Flush the rport_event_queue
1887 static void fc_rport_flush_queue(void)
1889 flush_workqueue(rport_event_queue);
1893 * fc_rport_init() - Initialize the remote port layer for a local port
1894 * @lport: The local port to initialize the remote port layer for
1896 int fc_rport_init(struct fc_lport *lport)
1898 if (!lport->tt.rport_lookup)
1899 lport->tt.rport_lookup = fc_rport_lookup;
1901 if (!lport->tt.rport_create)
1902 lport->tt.rport_create = fc_rport_create;
1904 if (!lport->tt.rport_login)
1905 lport->tt.rport_login = fc_rport_login;
1907 if (!lport->tt.rport_logoff)
1908 lport->tt.rport_logoff = fc_rport_logoff;
1910 if (!lport->tt.rport_recv_req)
1911 lport->tt.rport_recv_req = fc_rport_recv_req;
1913 if (!lport->tt.rport_flush_queue)
1914 lport->tt.rport_flush_queue = fc_rport_flush_queue;
1916 if (!lport->tt.rport_destroy)
1917 lport->tt.rport_destroy = fc_rport_destroy;
1921 EXPORT_SYMBOL(fc_rport_init);
1924 * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator.
1925 * @rdata: remote port private
1926 * @spp_len: service parameter page length
1927 * @rspp: received service parameter page
1928 * @spp: response service parameter page
1930 * Returns the value for the response code to be placed in spp_flags;
1931 * Returns 0 if not an initiator.
1933 static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len,
1934 const struct fc_els_spp *rspp,
1935 struct fc_els_spp *spp)
1937 struct fc_lport *lport = rdata->local_port;
1940 fcp_parm = ntohl(rspp->spp_params);
1941 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1942 if (fcp_parm & FCP_SPPF_INIT_FCN)
1943 rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1944 if (fcp_parm & FCP_SPPF_TARG_FCN)
1945 rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET;
1946 if (fcp_parm & FCP_SPPF_RETRY)
1947 rdata->flags |= FC_RP_FLAGS_RETRY;
1948 rdata->supported_classes = FC_COS_CLASS3;
1950 if (!(lport->service_params & FC_RPORT_ROLE_FCP_INITIATOR))
1953 spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
1956 * OR in our service parameters with other providers (target), if any.
1958 fcp_parm = ntohl(spp->spp_params);
1959 spp->spp_params = htonl(fcp_parm | lport->service_params);
1960 return FC_SPP_RESP_ACK;
1964 * FC-4 provider ops for FCP initiator.
1966 struct fc4_prov fc_rport_fcp_init = {
1967 .prli = fc_rport_fcp_prli,
1971 * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0
1972 * @rdata: remote port private
1973 * @spp_len: service parameter page length
1974 * @rspp: received service parameter page
1975 * @spp: response service parameter page
1977 static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len,
1978 const struct fc_els_spp *rspp,
1979 struct fc_els_spp *spp)
1981 if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR)
1982 return FC_SPP_RESP_INVL;
1983 return FC_SPP_RESP_ACK;
1987 * FC-4 provider ops for type 0 service parameters.
1989 * This handles the special case of type 0 which is always successful
1990 * but doesn't do anything otherwise.
1992 struct fc4_prov fc_rport_t0_prov = {
1993 .prli = fc_rport_t0_prli,
1997 * fc_setup_rport() - Initialize the rport_event_queue
1999 int fc_setup_rport(void)
2001 rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
2002 if (!rport_event_queue)
2008 * fc_destroy_rport() - Destroy the rport_event_queue
2010 void fc_destroy_rport(void)
2012 destroy_workqueue(rport_event_queue);
2016 * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port
2017 * @rport: The remote port whose I/O should be terminated
2019 void fc_rport_terminate_io(struct fc_rport *rport)
2021 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
2022 struct fc_lport *lport = rpriv->local_port;
2024 lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
2025 lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
2027 EXPORT_SYMBOL(fc_rport_terminate_io);