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 <linux/export.h>
55 #include <asm/unaligned.h>
57 #include <scsi/libfc.h>
58 #include <scsi/fc_encode.h>
62 static struct workqueue_struct *rport_event_queue;
64 static void fc_rport_enter_flogi(struct fc_rport_priv *);
65 static void fc_rport_enter_plogi(struct fc_rport_priv *);
66 static void fc_rport_enter_prli(struct fc_rport_priv *);
67 static void fc_rport_enter_rtv(struct fc_rport_priv *);
68 static void fc_rport_enter_ready(struct fc_rport_priv *);
69 static void fc_rport_enter_logo(struct fc_rport_priv *);
70 static void fc_rport_enter_adisc(struct fc_rport_priv *);
72 static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
73 static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
74 static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
75 static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *);
76 static void fc_rport_timeout(struct work_struct *);
77 static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *);
78 static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *);
79 static void fc_rport_work(struct work_struct *);
81 static const char *fc_rport_state_names[] = {
82 [RPORT_ST_INIT] = "Init",
83 [RPORT_ST_FLOGI] = "FLOGI",
84 [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT",
85 [RPORT_ST_PLOGI] = "PLOGI",
86 [RPORT_ST_PRLI] = "PRLI",
87 [RPORT_ST_RTV] = "RTV",
88 [RPORT_ST_READY] = "Ready",
89 [RPORT_ST_ADISC] = "ADISC",
90 [RPORT_ST_DELETE] = "Delete",
94 * fc_rport_lookup() - Lookup a remote port by port_id
95 * @lport: The local port to lookup the remote port on
96 * @port_id: The remote port ID to look up
98 * The reference count of the fc_rport_priv structure is
101 static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
104 struct fc_rport_priv *rdata = NULL, *tmp_rdata;
107 list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers)
108 if (tmp_rdata->ids.port_id == port_id &&
109 kref_get_unless_zero(&tmp_rdata->kref)) {
118 * fc_rport_create() - Create a new remote port
119 * @lport: The local port this remote port will be associated with
120 * @ids: The identifiers for the new remote port
122 * The remote port will start in the INIT state.
124 * Locking note: must be called with the disc_mutex held.
126 static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
129 struct fc_rport_priv *rdata;
131 rdata = lport->tt.rport_lookup(lport, port_id);
135 rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL);
139 rdata->ids.node_name = -1;
140 rdata->ids.port_name = -1;
141 rdata->ids.port_id = port_id;
142 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
144 kref_init(&rdata->kref);
145 mutex_init(&rdata->rp_mutex);
146 rdata->local_port = lport;
147 rdata->rp_state = RPORT_ST_INIT;
148 rdata->event = RPORT_EV_NONE;
149 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
150 rdata->e_d_tov = lport->e_d_tov;
151 rdata->r_a_tov = lport->r_a_tov;
152 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
153 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
154 INIT_WORK(&rdata->event_work, fc_rport_work);
155 if (port_id != FC_FID_DIR_SERV) {
156 rdata->lld_event_callback = lport->tt.rport_event_callback;
157 list_add_rcu(&rdata->peers, &lport->disc.rports);
163 * fc_rport_destroy() - Free a remote port after last reference is released
164 * @kref: The remote port's kref
166 static void fc_rport_destroy(struct kref *kref)
168 struct fc_rport_priv *rdata;
170 rdata = container_of(kref, struct fc_rport_priv, kref);
171 kfree_rcu(rdata, rcu);
175 * fc_rport_state() - Return a string identifying the remote port's state
176 * @rdata: The remote port
178 static const char *fc_rport_state(struct fc_rport_priv *rdata)
182 cp = fc_rport_state_names[rdata->rp_state];
189 * fc_set_rport_loss_tmo() - Set the remote port loss timeout
190 * @rport: The remote port that gets a new timeout value
191 * @timeout: The new timeout value (in seconds)
193 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
196 rport->dev_loss_tmo = timeout;
198 rport->dev_loss_tmo = 1;
200 EXPORT_SYMBOL(fc_set_rport_loss_tmo);
203 * fc_plogi_get_maxframe() - Get the maximum payload from the common service
204 * parameters in a FLOGI frame
205 * @flp: The FLOGI or PLOGI payload
206 * @maxval: The maximum frame size upper limit; this may be less than what
207 * is in the service parameters
209 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
215 * Get max payload from the common service parameters and the
216 * class 3 receive data field size.
218 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
219 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
221 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
222 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
228 * fc_rport_state_enter() - Change the state of a remote port
229 * @rdata: The remote port whose state should change
230 * @new: The new state
232 * Locking Note: Called with the rport lock held
234 static void fc_rport_state_enter(struct fc_rport_priv *rdata,
235 enum fc_rport_state new)
237 if (rdata->rp_state != new)
239 rdata->rp_state = new;
243 * fc_rport_work() - Handler for remote port events in the rport_event_queue
244 * @work: Handle to the remote port being dequeued
246 static void fc_rport_work(struct work_struct *work)
249 struct fc_rport_priv *rdata =
250 container_of(work, struct fc_rport_priv, event_work);
251 struct fc_rport_libfc_priv *rpriv;
252 enum fc_rport_event event;
253 struct fc_lport *lport = rdata->local_port;
254 struct fc_rport_operations *rport_ops;
255 struct fc_rport_identifiers ids;
256 struct fc_rport *rport;
257 struct fc4_prov *prov;
260 mutex_lock(&rdata->rp_mutex);
261 event = rdata->event;
262 rport_ops = rdata->ops;
263 rport = rdata->rport;
265 FC_RPORT_DBG(rdata, "work event %u\n", event);
270 rdata->event = RPORT_EV_NONE;
271 rdata->major_retries = 0;
272 kref_get(&rdata->kref);
273 mutex_unlock(&rdata->rp_mutex);
276 rport = fc_remote_port_add(lport->host, 0, &ids);
278 FC_RPORT_DBG(rdata, "Failed to add the rport\n");
279 lport->tt.rport_logoff(rdata);
280 kref_put(&rdata->kref, lport->tt.rport_destroy);
283 mutex_lock(&rdata->rp_mutex);
285 FC_RPORT_DBG(rdata, "rport already allocated\n");
286 rdata->rport = rport;
287 rport->maxframe_size = rdata->maxframe_size;
288 rport->supported_classes = rdata->supported_classes;
290 rpriv = rport->dd_data;
291 rpriv->local_port = lport;
292 rpriv->rp_state = rdata->rp_state;
293 rpriv->flags = rdata->flags;
294 rpriv->e_d_tov = rdata->e_d_tov;
295 rpriv->r_a_tov = rdata->r_a_tov;
296 mutex_unlock(&rdata->rp_mutex);
298 if (rport_ops && rport_ops->event_callback) {
299 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
300 rport_ops->event_callback(lport, rdata, event);
302 if (rdata->lld_event_callback) {
303 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
304 rdata->lld_event_callback(lport, rdata, event);
306 kref_put(&rdata->kref, lport->tt.rport_destroy);
309 case RPORT_EV_FAILED:
312 if (rdata->prli_count) {
313 mutex_lock(&fc_prov_mutex);
314 for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
315 prov = fc_passive_prov[type];
316 if (prov && prov->prlo)
319 mutex_unlock(&fc_prov_mutex);
321 port_id = rdata->ids.port_id;
322 mutex_unlock(&rdata->rp_mutex);
324 if (rport_ops && rport_ops->event_callback) {
325 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
326 rport_ops->event_callback(lport, rdata, event);
328 if (rdata->lld_event_callback) {
329 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
330 rdata->lld_event_callback(lport, rdata, event);
332 cancel_delayed_work_sync(&rdata->retry_work);
335 * Reset any outstanding exchanges before freeing rport.
337 lport->tt.exch_mgr_reset(lport, 0, port_id);
338 lport->tt.exch_mgr_reset(lport, port_id, 0);
341 rpriv = rport->dd_data;
342 rpriv->rp_state = RPORT_ST_DELETE;
343 mutex_lock(&rdata->rp_mutex);
345 mutex_unlock(&rdata->rp_mutex);
346 fc_remote_port_delete(rport);
349 mutex_lock(&rdata->rp_mutex);
350 if (rdata->rp_state == RPORT_ST_DELETE) {
351 if (port_id == FC_FID_DIR_SERV) {
352 rdata->event = RPORT_EV_NONE;
353 mutex_unlock(&rdata->rp_mutex);
354 kref_put(&rdata->kref, lport->tt.rport_destroy);
355 } else if ((rdata->flags & FC_RP_STARTED) &&
356 rdata->major_retries <
357 lport->max_rport_retry_count) {
358 rdata->major_retries++;
359 rdata->event = RPORT_EV_NONE;
360 FC_RPORT_DBG(rdata, "work restart\n");
361 fc_rport_enter_flogi(rdata);
362 mutex_unlock(&rdata->rp_mutex);
364 FC_RPORT_DBG(rdata, "work delete\n");
365 list_del_rcu(&rdata->peers);
366 mutex_unlock(&rdata->rp_mutex);
367 kref_put(&rdata->kref, lport->tt.rport_destroy);
371 * Re-open for events. Reissue READY event if ready.
373 rdata->event = RPORT_EV_NONE;
374 if (rdata->rp_state == RPORT_ST_READY)
375 fc_rport_enter_ready(rdata);
376 mutex_unlock(&rdata->rp_mutex);
381 mutex_unlock(&rdata->rp_mutex);
387 * fc_rport_login() - Start the remote port login state machine
388 * @rdata: The remote port to be logged in to
390 * Locking Note: Called without the rport lock held. This
391 * function will hold the rport lock, call an _enter_*
392 * function and then unlock the rport.
394 * This indicates the intent to be logged into the remote port.
395 * If it appears we are already logged in, ADISC is used to verify
398 static int fc_rport_login(struct fc_rport_priv *rdata)
400 mutex_lock(&rdata->rp_mutex);
402 rdata->flags |= FC_RP_STARTED;
403 switch (rdata->rp_state) {
405 FC_RPORT_DBG(rdata, "ADISC port\n");
406 fc_rport_enter_adisc(rdata);
408 case RPORT_ST_DELETE:
409 FC_RPORT_DBG(rdata, "Restart deleted port\n");
412 FC_RPORT_DBG(rdata, "Login to port\n");
413 fc_rport_enter_flogi(rdata);
416 mutex_unlock(&rdata->rp_mutex);
422 * fc_rport_enter_delete() - Schedule a remote port to be deleted
423 * @rdata: The remote port to be deleted
424 * @event: The event to report as the reason for deletion
426 * Locking Note: Called with the rport lock held.
428 * Allow state change into DELETE only once.
430 * Call queue_work only if there's no event already pending.
431 * Set the new event so that the old pending event will not occur.
432 * Since we have the mutex, even if fc_rport_work() is already started,
433 * it'll see the new event.
435 static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
436 enum fc_rport_event event)
438 if (rdata->rp_state == RPORT_ST_DELETE)
441 FC_RPORT_DBG(rdata, "Delete port\n");
443 fc_rport_state_enter(rdata, RPORT_ST_DELETE);
445 if (rdata->event == RPORT_EV_NONE)
446 queue_work(rport_event_queue, &rdata->event_work);
447 rdata->event = event;
451 * fc_rport_logoff() - Logoff and remove a remote port
452 * @rdata: The remote port to be logged off of
454 * Locking Note: Called without the rport lock held. This
455 * function will hold the rport lock, call an _enter_*
456 * function and then unlock the rport.
458 static int fc_rport_logoff(struct fc_rport_priv *rdata)
460 mutex_lock(&rdata->rp_mutex);
462 FC_RPORT_DBG(rdata, "Remove port\n");
464 rdata->flags &= ~FC_RP_STARTED;
465 if (rdata->rp_state == RPORT_ST_DELETE) {
466 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
469 fc_rport_enter_logo(rdata);
472 * Change the state to Delete so that we discard
475 fc_rport_enter_delete(rdata, RPORT_EV_STOP);
477 mutex_unlock(&rdata->rp_mutex);
482 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
483 * @rdata: The remote port that is ready
485 * Locking Note: The rport lock is expected to be held before calling
488 static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
490 fc_rport_state_enter(rdata, RPORT_ST_READY);
492 FC_RPORT_DBG(rdata, "Port is Ready\n");
494 if (rdata->event == RPORT_EV_NONE)
495 queue_work(rport_event_queue, &rdata->event_work);
496 rdata->event = RPORT_EV_READY;
500 * fc_rport_timeout() - Handler for the retry_work timer
501 * @work: Handle to the remote port that has timed out
503 * Locking Note: Called without the rport lock held. This
504 * function will hold the rport lock, call an _enter_*
505 * function and then unlock the rport.
507 static void fc_rport_timeout(struct work_struct *work)
509 struct fc_rport_priv *rdata =
510 container_of(work, struct fc_rport_priv, retry_work.work);
512 mutex_lock(&rdata->rp_mutex);
514 switch (rdata->rp_state) {
516 fc_rport_enter_flogi(rdata);
519 fc_rport_enter_plogi(rdata);
522 fc_rport_enter_prli(rdata);
525 fc_rport_enter_rtv(rdata);
528 fc_rport_enter_adisc(rdata);
530 case RPORT_ST_PLOGI_WAIT:
533 case RPORT_ST_DELETE:
537 mutex_unlock(&rdata->rp_mutex);
541 * fc_rport_error() - Error handler, called once retries have been exhausted
542 * @rdata: The remote port the error is happened on
543 * @fp: The error code encapsulated in a frame pointer
545 * Locking Note: The rport lock is expected to be held before
546 * calling this routine
548 static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp)
550 FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n",
551 IS_ERR(fp) ? -PTR_ERR(fp) : 0,
552 fc_rport_state(rdata), rdata->retries);
554 switch (rdata->rp_state) {
557 rdata->flags &= ~FC_RP_STARTED;
558 fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
561 fc_rport_enter_ready(rdata);
565 fc_rport_enter_logo(rdata);
567 case RPORT_ST_PLOGI_WAIT:
568 case RPORT_ST_DELETE:
576 * fc_rport_error_retry() - Handler for remote port state retries
577 * @rdata: The remote port whose state is to be retried
578 * @fp: The error code encapsulated in a frame pointer
580 * If the error was an exchange timeout retry immediately,
581 * otherwise wait for E_D_TOV.
583 * Locking Note: The rport lock is expected to be held before
584 * calling this routine
586 static void fc_rport_error_retry(struct fc_rport_priv *rdata,
589 unsigned long delay = msecs_to_jiffies(FC_DEF_E_D_TOV);
591 /* make sure this isn't an FC_EX_CLOSED error, never retry those */
592 if (PTR_ERR(fp) == -FC_EX_CLOSED)
595 if (rdata->retries < rdata->local_port->max_rport_retry_count) {
596 FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n",
597 PTR_ERR(fp), fc_rport_state(rdata));
599 /* no additional delay on exchange timeouts */
600 if (PTR_ERR(fp) == -FC_EX_TIMEOUT)
602 schedule_delayed_work(&rdata->retry_work, delay);
607 fc_rport_error(rdata, fp);
611 * fc_rport_login_complete() - Handle parameters and completion of p-mp login.
612 * @rdata: The remote port which we logged into or which logged into us.
613 * @fp: The FLOGI or PLOGI request or response frame
615 * Returns non-zero error if a problem is detected with the frame.
616 * Does not free the frame.
618 * This is only used in point-to-multipoint mode for FIP currently.
620 static int fc_rport_login_complete(struct fc_rport_priv *rdata,
623 struct fc_lport *lport = rdata->local_port;
624 struct fc_els_flogi *flogi;
625 unsigned int e_d_tov;
628 flogi = fc_frame_payload_get(fp, sizeof(*flogi));
632 csp_flags = ntohs(flogi->fl_csp.sp_features);
634 if (fc_frame_payload_op(fp) == ELS_FLOGI) {
635 if (csp_flags & FC_SP_FT_FPORT) {
636 FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n");
642 * E_D_TOV is not valid on an incoming FLOGI request.
644 e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov);
645 if (csp_flags & FC_SP_FT_EDTR)
647 if (e_d_tov > rdata->e_d_tov)
648 rdata->e_d_tov = e_d_tov;
650 rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs);
655 * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode
656 * @sp: The sequence that the FLOGI was on
657 * @fp: The FLOGI response frame
658 * @rp_arg: The remote port that received the FLOGI response
660 static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
663 struct fc_rport_priv *rdata = rp_arg;
664 struct fc_lport *lport = rdata->local_port;
665 struct fc_els_flogi *flogi;
666 unsigned int r_a_tov;
668 FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", fc_els_resp_type(fp));
670 if (fp == ERR_PTR(-FC_EX_CLOSED))
673 mutex_lock(&rdata->rp_mutex);
675 if (rdata->rp_state != RPORT_ST_FLOGI) {
676 FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state "
677 "%s\n", fc_rport_state(rdata));
684 fc_rport_error(rdata, fp);
688 if (fc_frame_payload_op(fp) != ELS_LS_ACC)
690 if (fc_rport_login_complete(rdata, fp))
693 flogi = fc_frame_payload_get(fp, sizeof(*flogi));
696 r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
697 if (r_a_tov > rdata->r_a_tov)
698 rdata->r_a_tov = r_a_tov;
700 if (rdata->ids.port_name < lport->wwpn)
701 fc_rport_enter_plogi(rdata);
703 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
707 mutex_unlock(&rdata->rp_mutex);
709 kref_put(&rdata->kref, lport->tt.rport_destroy);
712 FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
713 fc_rport_error_retry(rdata, fp);
718 * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp
719 * @rdata: The remote port to send a FLOGI to
721 * Locking Note: The rport lock is expected to be held before calling
724 static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
726 struct fc_lport *lport = rdata->local_port;
729 if (!lport->point_to_multipoint)
730 return fc_rport_enter_plogi(rdata);
732 FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n",
733 fc_rport_state(rdata));
735 fc_rport_state_enter(rdata, RPORT_ST_FLOGI);
737 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
739 return fc_rport_error_retry(rdata, fp);
741 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI,
742 fc_rport_flogi_resp, rdata,
744 fc_rport_error_retry(rdata, NULL);
746 kref_get(&rdata->kref);
750 * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode
751 * @lport: The local port that received the PLOGI request
752 * @rx_fp: The PLOGI request frame
754 static void fc_rport_recv_flogi_req(struct fc_lport *lport,
755 struct fc_frame *rx_fp)
757 struct fc_disc *disc;
758 struct fc_els_flogi *flp;
759 struct fc_rport_priv *rdata;
760 struct fc_frame *fp = rx_fp;
761 struct fc_seq_els_data rjt_data;
764 sid = fc_frame_sid(fp);
766 FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
769 if (!lport->point_to_multipoint) {
770 rjt_data.reason = ELS_RJT_UNSUP;
771 rjt_data.explan = ELS_EXPL_NONE;
775 flp = fc_frame_payload_get(fp, sizeof(*flp));
777 rjt_data.reason = ELS_RJT_LOGIC;
778 rjt_data.explan = ELS_EXPL_INV_LEN;
782 rdata = lport->tt.rport_lookup(lport, sid);
784 rjt_data.reason = ELS_RJT_FIP;
785 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
788 mutex_lock(&rdata->rp_mutex);
790 FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
791 fc_rport_state(rdata));
793 switch (rdata->rp_state) {
796 * If received the FLOGI request on RPORT which is INIT state
797 * (means not transition to FLOGI either fc_rport timeout
798 * function didn;t trigger or this end hasn;t received
799 * beacon yet from other end. In that case only, allow RPORT
800 * state machine to continue, otherwise fall through which
801 * causes the code to send reject response.
802 * NOTE; Not checking for FIP->state such as VNMP_UP or
803 * VNMP_CLAIM because if FIP state is not one of those,
804 * RPORT wouldn;t have created and 'rport_lookup' would have
805 * failed anyway in that case.
807 if (lport->point_to_multipoint)
809 case RPORT_ST_DELETE:
810 mutex_unlock(&rdata->rp_mutex);
811 rjt_data.reason = ELS_RJT_FIP;
812 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
815 case RPORT_ST_PLOGI_WAIT:
823 * Set the remote port to be deleted and to then restart.
824 * This queues work to be sure exchanges are reset.
826 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
827 mutex_unlock(&rdata->rp_mutex);
828 rjt_data.reason = ELS_RJT_BUSY;
829 rjt_data.explan = ELS_EXPL_NONE;
832 if (fc_rport_login_complete(rdata, fp)) {
833 mutex_unlock(&rdata->rp_mutex);
834 rjt_data.reason = ELS_RJT_LOGIC;
835 rjt_data.explan = ELS_EXPL_NONE;
839 fp = fc_frame_alloc(lport, sizeof(*flp));
843 fc_flogi_fill(lport, fp);
844 flp = fc_frame_payload_get(fp, sizeof(*flp));
845 flp->fl_cmd = ELS_LS_ACC;
847 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
848 lport->tt.frame_send(lport, fp);
850 if (rdata->ids.port_name < lport->wwpn)
851 fc_rport_enter_plogi(rdata);
853 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
855 mutex_unlock(&rdata->rp_mutex);
856 kref_put(&rdata->kref, lport->tt.rport_destroy);
857 fc_frame_free(rx_fp);
861 kref_put(&rdata->kref, lport->tt.rport_destroy);
863 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
864 fc_frame_free(rx_fp);
868 * fc_rport_plogi_resp() - Handler for ELS PLOGI responses
869 * @sp: The sequence the PLOGI is on
870 * @fp: The PLOGI response frame
871 * @rdata_arg: The remote port that sent the PLOGI response
873 * Locking Note: This function will be called without the rport lock
874 * held, but it will lock, call an _enter_* function or fc_rport_error
875 * and then unlock the rport.
877 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
880 struct fc_rport_priv *rdata = rdata_arg;
881 struct fc_lport *lport = rdata->local_port;
882 struct fc_els_flogi *plp = NULL;
887 mutex_lock(&rdata->rp_mutex);
889 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
891 if (rdata->rp_state != RPORT_ST_PLOGI) {
892 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
893 "%s\n", fc_rport_state(rdata));
900 fc_rport_error_retry(rdata, fp);
904 op = fc_frame_payload_op(fp);
905 if (op == ELS_LS_ACC &&
906 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
907 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
908 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn);
910 /* save plogi response sp_features for further reference */
911 rdata->sp_features = ntohs(plp->fl_csp.sp_features);
913 if (lport->point_to_multipoint)
914 fc_rport_login_complete(rdata, fp);
915 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
916 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
917 if (cssp_seq < csp_seq)
919 rdata->max_seq = csp_seq;
920 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs);
921 fc_rport_enter_prli(rdata);
923 fc_rport_error_retry(rdata, fp);
928 mutex_unlock(&rdata->rp_mutex);
929 kref_put(&rdata->kref, lport->tt.rport_destroy);
933 fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata)
935 if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN)
937 if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) &&
938 (lport->service_params & FCP_SPPF_INIT_FCN))
940 if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) &&
941 (lport->service_params & FCP_SPPF_TARG_FCN))
947 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request
948 * @rdata: The remote port to send a PLOGI to
950 * Locking Note: The rport lock is expected to be held before calling
953 static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
955 struct fc_lport *lport = rdata->local_port;
958 if (!fc_rport_compatible_roles(lport, rdata)) {
959 FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n");
960 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
964 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
965 fc_rport_state(rdata));
967 fc_rport_state_enter(rdata, RPORT_ST_PLOGI);
969 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
970 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
972 FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__);
973 fc_rport_error_retry(rdata, fp);
976 rdata->e_d_tov = lport->e_d_tov;
978 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
979 fc_rport_plogi_resp, rdata,
981 fc_rport_error_retry(rdata, NULL);
983 kref_get(&rdata->kref);
987 * fc_rport_prli_resp() - Process Login (PRLI) response handler
988 * @sp: The sequence the PRLI response was on
989 * @fp: The PRLI response frame
990 * @rdata_arg: The remote port that sent the PRLI response
992 * Locking Note: This function will be called without the rport lock
993 * held, but it will lock, call an _enter_* function or fc_rport_error
994 * and then unlock the rport.
996 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
999 struct fc_rport_priv *rdata = rdata_arg;
1001 struct fc_els_prli prli;
1002 struct fc_els_spp spp;
1004 struct fc_els_spp temp_spp;
1005 struct fc4_prov *prov;
1006 u32 roles = FC_RPORT_ROLE_UNKNOWN;
1011 mutex_lock(&rdata->rp_mutex);
1013 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
1015 if (rdata->rp_state != RPORT_ST_PRLI) {
1016 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
1017 "%s\n", fc_rport_state(rdata));
1024 fc_rport_error_retry(rdata, fp);
1028 /* reinitialize remote port roles */
1029 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1031 op = fc_frame_payload_op(fp);
1032 if (op == ELS_LS_ACC) {
1033 pp = fc_frame_payload_get(fp, sizeof(*pp));
1037 resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
1038 FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n",
1040 rdata->spp_type = pp->spp.spp_type;
1041 if (resp_code != FC_SPP_RESP_ACK) {
1042 if (resp_code == FC_SPP_RESP_CONF)
1043 fc_rport_error(rdata, fp);
1045 fc_rport_error_retry(rdata, fp);
1048 if (pp->prli.prli_spp_len < sizeof(pp->spp))
1051 fcp_parm = ntohl(pp->spp.spp_params);
1052 if (fcp_parm & FCP_SPPF_RETRY)
1053 rdata->flags |= FC_RP_FLAGS_RETRY;
1054 if (fcp_parm & FCP_SPPF_CONF_COMPL)
1055 rdata->flags |= FC_RP_FLAGS_CONF_REQ;
1057 prov = fc_passive_prov[FC_TYPE_FCP];
1059 memset(&temp_spp, 0, sizeof(temp_spp));
1060 prov->prli(rdata, pp->prli.prli_spp_len,
1061 &pp->spp, &temp_spp);
1064 rdata->supported_classes = FC_COS_CLASS3;
1065 if (fcp_parm & FCP_SPPF_INIT_FCN)
1066 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1067 if (fcp_parm & FCP_SPPF_TARG_FCN)
1068 roles |= FC_RPORT_ROLE_FCP_TARGET;
1070 rdata->ids.roles = roles;
1071 fc_rport_enter_rtv(rdata);
1074 FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n");
1075 fc_rport_error_retry(rdata, fp);
1081 mutex_unlock(&rdata->rp_mutex);
1082 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1086 * fc_rport_enter_prli() - Send Process Login (PRLI) request
1087 * @rdata: The remote port to send the PRLI request to
1089 * Locking Note: The rport lock is expected to be held before calling
1092 static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
1094 struct fc_lport *lport = rdata->local_port;
1096 struct fc_els_prli prli;
1097 struct fc_els_spp spp;
1099 struct fc_frame *fp;
1100 struct fc4_prov *prov;
1103 * If the rport is one of the well known addresses
1104 * we skip PRLI and RTV and go straight to READY.
1106 if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
1107 fc_rport_enter_ready(rdata);
1111 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
1112 fc_rport_state(rdata));
1114 fc_rport_state_enter(rdata, RPORT_ST_PRLI);
1116 fp = fc_frame_alloc(lport, sizeof(*pp));
1118 fc_rport_error_retry(rdata, fp);
1122 fc_prli_fill(lport, fp);
1124 prov = fc_passive_prov[FC_TYPE_FCP];
1126 pp = fc_frame_payload_get(fp, sizeof(*pp));
1127 prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
1130 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id,
1131 fc_host_port_id(lport->host), FC_TYPE_ELS,
1132 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1134 if (!lport->tt.exch_seq_send(lport, fp, fc_rport_prli_resp,
1135 NULL, rdata, 2 * lport->r_a_tov))
1136 fc_rport_error_retry(rdata, NULL);
1138 kref_get(&rdata->kref);
1142 * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses
1143 * @sp: The sequence the RTV was on
1144 * @fp: The RTV response frame
1145 * @rdata_arg: The remote port that sent the RTV response
1147 * Many targets don't seem to support this.
1149 * Locking Note: This function will be called without the rport lock
1150 * held, but it will lock, call an _enter_* function or fc_rport_error
1151 * and then unlock the rport.
1153 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
1156 struct fc_rport_priv *rdata = rdata_arg;
1159 mutex_lock(&rdata->rp_mutex);
1161 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
1163 if (rdata->rp_state != RPORT_ST_RTV) {
1164 FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
1165 "%s\n", fc_rport_state(rdata));
1172 fc_rport_error(rdata, fp);
1176 op = fc_frame_payload_op(fp);
1177 if (op == ELS_LS_ACC) {
1178 struct fc_els_rtv_acc *rtv;
1182 rtv = fc_frame_payload_get(fp, sizeof(*rtv));
1184 toq = ntohl(rtv->rtv_toq);
1185 tov = ntohl(rtv->rtv_r_a_tov);
1188 rdata->r_a_tov = tov;
1189 tov = ntohl(rtv->rtv_e_d_tov);
1190 if (toq & FC_ELS_RTV_EDRES)
1194 rdata->e_d_tov = tov;
1198 fc_rport_enter_ready(rdata);
1203 mutex_unlock(&rdata->rp_mutex);
1204 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1208 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request
1209 * @rdata: The remote port to send the RTV request to
1211 * Locking Note: The rport lock is expected to be held before calling
1214 static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
1216 struct fc_frame *fp;
1217 struct fc_lport *lport = rdata->local_port;
1219 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
1220 fc_rport_state(rdata));
1222 fc_rport_state_enter(rdata, RPORT_ST_RTV);
1224 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
1226 fc_rport_error_retry(rdata, fp);
1230 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
1231 fc_rport_rtv_resp, rdata,
1232 2 * lport->r_a_tov))
1233 fc_rport_error_retry(rdata, NULL);
1235 kref_get(&rdata->kref);
1239 * fc_rport_logo_resp() - Handler for logout (LOGO) responses
1240 * @sp: The sequence the LOGO was on
1241 * @fp: The LOGO response frame
1242 * @lport_arg: The local port
1244 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1247 struct fc_lport *lport = lport_arg;
1249 FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
1250 "Received a LOGO %s\n", fc_els_resp_type(fp));
1257 * fc_rport_enter_logo() - Send a logout (LOGO) request
1258 * @rdata: The remote port to send the LOGO request to
1260 * Locking Note: The rport lock is expected to be held before calling
1263 static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
1265 struct fc_lport *lport = rdata->local_port;
1266 struct fc_frame *fp;
1268 FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
1269 fc_rport_state(rdata));
1271 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
1274 (void)lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
1275 fc_rport_logo_resp, lport, 0);
1279 * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses
1280 * @sp: The sequence the ADISC response was on
1281 * @fp: The ADISC response frame
1282 * @rdata_arg: The remote port that sent the ADISC response
1284 * Locking Note: This function will be called without the rport lock
1285 * held, but it will lock, call an _enter_* function or fc_rport_error
1286 * and then unlock the rport.
1288 static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
1291 struct fc_rport_priv *rdata = rdata_arg;
1292 struct fc_els_adisc *adisc;
1295 mutex_lock(&rdata->rp_mutex);
1297 FC_RPORT_DBG(rdata, "Received a ADISC response\n");
1299 if (rdata->rp_state != RPORT_ST_ADISC) {
1300 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
1301 fc_rport_state(rdata));
1308 fc_rport_error(rdata, fp);
1313 * If address verification failed. Consider us logged out of the rport.
1314 * Since the rport is still in discovery, we want to be
1315 * logged in, so go to PLOGI state. Otherwise, go back to READY.
1317 op = fc_frame_payload_op(fp);
1318 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1319 if (op != ELS_LS_ACC || !adisc ||
1320 ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
1321 get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
1322 get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) {
1323 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
1324 fc_rport_enter_flogi(rdata);
1326 FC_RPORT_DBG(rdata, "ADISC OK\n");
1327 fc_rport_enter_ready(rdata);
1332 mutex_unlock(&rdata->rp_mutex);
1333 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1337 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request
1338 * @rdata: The remote port to send the ADISC request to
1340 * Locking Note: The rport lock is expected to be held before calling
1343 static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
1345 struct fc_lport *lport = rdata->local_port;
1346 struct fc_frame *fp;
1348 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
1349 fc_rport_state(rdata));
1351 fc_rport_state_enter(rdata, RPORT_ST_ADISC);
1353 fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
1355 fc_rport_error_retry(rdata, fp);
1358 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
1359 fc_rport_adisc_resp, rdata,
1360 2 * lport->r_a_tov))
1361 fc_rport_error_retry(rdata, NULL);
1363 kref_get(&rdata->kref);
1367 * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests
1368 * @rdata: The remote port that sent the ADISC request
1369 * @in_fp: The ADISC request frame
1371 * Locking Note: Called with the lport and rport locks held.
1373 static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
1374 struct fc_frame *in_fp)
1376 struct fc_lport *lport = rdata->local_port;
1377 struct fc_frame *fp;
1378 struct fc_els_adisc *adisc;
1379 struct fc_seq_els_data rjt_data;
1381 FC_RPORT_DBG(rdata, "Received ADISC request\n");
1383 adisc = fc_frame_payload_get(in_fp, sizeof(*adisc));
1385 rjt_data.reason = ELS_RJT_PROT;
1386 rjt_data.explan = ELS_EXPL_INV_LEN;
1387 lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
1391 fp = fc_frame_alloc(lport, sizeof(*adisc));
1394 fc_adisc_fill(lport, fp);
1395 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1396 adisc->adisc_cmd = ELS_LS_ACC;
1397 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
1398 lport->tt.frame_send(lport, fp);
1400 fc_frame_free(in_fp);
1404 * fc_rport_recv_rls_req() - Handle received Read Link Status request
1405 * @rdata: The remote port that sent the RLS request
1406 * @rx_fp: The PRLI request frame
1408 * Locking Note: The rport lock is expected to be held before calling
1411 static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
1412 struct fc_frame *rx_fp)
1415 struct fc_lport *lport = rdata->local_port;
1416 struct fc_frame *fp;
1417 struct fc_els_rls *rls;
1418 struct fc_els_rls_resp *rsp;
1419 struct fc_els_lesb *lesb;
1420 struct fc_seq_els_data rjt_data;
1421 struct fc_host_statistics *hst;
1423 FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
1424 fc_rport_state(rdata));
1426 rls = fc_frame_payload_get(rx_fp, sizeof(*rls));
1428 rjt_data.reason = ELS_RJT_PROT;
1429 rjt_data.explan = ELS_EXPL_INV_LEN;
1433 fp = fc_frame_alloc(lport, sizeof(*rsp));
1435 rjt_data.reason = ELS_RJT_UNAB;
1436 rjt_data.explan = ELS_EXPL_INSUF_RES;
1440 rsp = fc_frame_payload_get(fp, sizeof(*rsp));
1441 memset(rsp, 0, sizeof(*rsp));
1442 rsp->rls_cmd = ELS_LS_ACC;
1443 lesb = &rsp->rls_lesb;
1444 if (lport->tt.get_lesb) {
1445 /* get LESB from LLD if it supports it */
1446 lport->tt.get_lesb(lport, lesb);
1448 fc_get_host_stats(lport->host);
1449 hst = &lport->host_stats;
1450 lesb->lesb_link_fail = htonl(hst->link_failure_count);
1451 lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
1452 lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
1453 lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
1454 lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
1455 lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
1458 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1459 lport->tt.frame_send(lport, fp);
1463 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1465 fc_frame_free(rx_fp);
1469 * fc_rport_recv_els_req() - Handler for validated ELS requests
1470 * @lport: The local port that received the ELS request
1471 * @fp: The ELS request frame
1473 * Handle incoming ELS requests that require port login.
1474 * The ELS opcode has already been validated by the caller.
1476 * Locking Note: Called with the lport lock held.
1478 static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp)
1480 struct fc_rport_priv *rdata;
1481 struct fc_seq_els_data els_data;
1483 rdata = lport->tt.rport_lookup(lport, fc_frame_sid(fp));
1487 mutex_lock(&rdata->rp_mutex);
1489 switch (rdata->rp_state) {
1492 case RPORT_ST_READY:
1493 case RPORT_ST_ADISC:
1496 mutex_unlock(&rdata->rp_mutex);
1497 kref_put(&rdata->kref, lport->tt.rport_destroy);
1501 switch (fc_frame_payload_op(fp)) {
1503 fc_rport_recv_prli_req(rdata, fp);
1506 fc_rport_recv_prlo_req(rdata, fp);
1509 fc_rport_recv_adisc_req(rdata, fp);
1512 lport->tt.seq_els_rsp_send(fp, ELS_RRQ, NULL);
1516 lport->tt.seq_els_rsp_send(fp, ELS_REC, NULL);
1520 fc_rport_recv_rls_req(rdata, fp);
1523 fc_frame_free(fp); /* can't happen */
1527 mutex_unlock(&rdata->rp_mutex);
1528 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1532 els_data.reason = ELS_RJT_UNAB;
1533 els_data.explan = ELS_EXPL_PLOGI_REQD;
1534 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1539 * fc_rport_recv_req() - Handler for requests
1540 * @lport: The local port that received the request
1541 * @fp: The request frame
1543 * Locking Note: Called with the lport lock held.
1545 static void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp)
1547 struct fc_seq_els_data els_data;
1550 * Handle FLOGI, PLOGI and LOGO requests separately, since they
1551 * don't require prior login.
1552 * Check for unsupported opcodes first and reject them.
1553 * For some ops, it would be incorrect to reject with "PLOGI required".
1555 switch (fc_frame_payload_op(fp)) {
1557 fc_rport_recv_flogi_req(lport, fp);
1560 fc_rport_recv_plogi_req(lport, fp);
1563 fc_rport_recv_logo_req(lport, fp);
1571 fc_rport_recv_els_req(lport, fp);
1574 els_data.reason = ELS_RJT_UNSUP;
1575 els_data.explan = ELS_EXPL_NONE;
1576 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1583 * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests
1584 * @lport: The local port that received the PLOGI request
1585 * @rx_fp: The PLOGI request frame
1587 * Locking Note: The rport lock is held before calling this function.
1589 static void fc_rport_recv_plogi_req(struct fc_lport *lport,
1590 struct fc_frame *rx_fp)
1592 struct fc_disc *disc;
1593 struct fc_rport_priv *rdata;
1594 struct fc_frame *fp = rx_fp;
1595 struct fc_els_flogi *pl;
1596 struct fc_seq_els_data rjt_data;
1599 sid = fc_frame_sid(fp);
1601 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
1603 pl = fc_frame_payload_get(fp, sizeof(*pl));
1605 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
1606 rjt_data.reason = ELS_RJT_PROT;
1607 rjt_data.explan = ELS_EXPL_INV_LEN;
1611 disc = &lport->disc;
1612 mutex_lock(&disc->disc_mutex);
1613 rdata = lport->tt.rport_create(lport, sid);
1615 mutex_unlock(&disc->disc_mutex);
1616 rjt_data.reason = ELS_RJT_UNAB;
1617 rjt_data.explan = ELS_EXPL_INSUF_RES;
1621 mutex_lock(&rdata->rp_mutex);
1622 mutex_unlock(&disc->disc_mutex);
1624 rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
1625 rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn);
1628 * If the rport was just created, possibly due to the incoming PLOGI,
1629 * set the state appropriately and accept the PLOGI.
1631 * If we had also sent a PLOGI, and if the received PLOGI is from a
1632 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
1633 * "command already in progress".
1635 * XXX TBD: If the session was ready before, the PLOGI should result in
1636 * all outstanding exchanges being reset.
1638 switch (rdata->rp_state) {
1640 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
1642 case RPORT_ST_PLOGI_WAIT:
1643 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n");
1645 case RPORT_ST_PLOGI:
1646 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
1647 if (rdata->ids.port_name < lport->wwpn) {
1648 mutex_unlock(&rdata->rp_mutex);
1649 rjt_data.reason = ELS_RJT_INPROG;
1650 rjt_data.explan = ELS_EXPL_NONE;
1656 case RPORT_ST_READY:
1657 case RPORT_ST_ADISC:
1658 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
1659 "- ignored for now\n", rdata->rp_state);
1660 /* XXX TBD - should reset */
1662 case RPORT_ST_FLOGI:
1663 case RPORT_ST_DELETE:
1664 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
1665 fc_rport_state(rdata));
1666 mutex_unlock(&rdata->rp_mutex);
1667 rjt_data.reason = ELS_RJT_BUSY;
1668 rjt_data.explan = ELS_EXPL_NONE;
1671 if (!fc_rport_compatible_roles(lport, rdata)) {
1672 FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n");
1673 mutex_unlock(&rdata->rp_mutex);
1674 rjt_data.reason = ELS_RJT_LOGIC;
1675 rjt_data.explan = ELS_EXPL_NONE;
1680 * Get session payload size from incoming PLOGI.
1682 rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
1685 * Send LS_ACC. If this fails, the originator should retry.
1687 fp = fc_frame_alloc(lport, sizeof(*pl));
1691 fc_plogi_fill(lport, fp, ELS_LS_ACC);
1692 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1693 lport->tt.frame_send(lport, fp);
1694 fc_rport_enter_prli(rdata);
1696 mutex_unlock(&rdata->rp_mutex);
1697 fc_frame_free(rx_fp);
1701 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
1706 * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests
1707 * @rdata: The remote port that sent the PRLI request
1708 * @rx_fp: The PRLI request frame
1710 * Locking Note: The rport lock is expected to be held before calling
1713 static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
1714 struct fc_frame *rx_fp)
1716 struct fc_lport *lport = rdata->local_port;
1717 struct fc_frame *fp;
1719 struct fc_els_prli prli;
1720 struct fc_els_spp spp;
1722 struct fc_els_spp *rspp; /* request service param page */
1723 struct fc_els_spp *spp; /* response spp */
1726 enum fc_els_spp_resp resp;
1727 enum fc_els_spp_resp passive;
1728 struct fc_seq_els_data rjt_data;
1729 struct fc4_prov *prov;
1731 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
1732 fc_rport_state(rdata));
1734 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1735 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1738 plen = ntohs(pp->prli.prli_len);
1739 if ((plen % 4) != 0 || plen > len || plen < 16)
1743 plen = pp->prli.prli_spp_len;
1744 if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1745 plen > len || len < sizeof(*pp) || plen < 12)
1749 fp = fc_frame_alloc(lport, len);
1751 rjt_data.reason = ELS_RJT_UNAB;
1752 rjt_data.explan = ELS_EXPL_INSUF_RES;
1755 pp = fc_frame_payload_get(fp, len);
1758 pp->prli.prli_cmd = ELS_LS_ACC;
1759 pp->prli.prli_spp_len = plen;
1760 pp->prli.prli_len = htons(len);
1761 len -= sizeof(struct fc_els_prli);
1764 * Go through all the service parameter pages and build
1765 * response. If plen indicates longer SPP than standard,
1766 * use that. The entire response has been pre-cleared above.
1769 mutex_lock(&fc_prov_mutex);
1770 while (len >= plen) {
1771 rdata->spp_type = rspp->spp_type;
1772 spp->spp_type = rspp->spp_type;
1773 spp->spp_type_ext = rspp->spp_type_ext;
1776 if (rspp->spp_type < FC_FC4_PROV_SIZE) {
1777 prov = fc_active_prov[rspp->spp_type];
1779 resp = prov->prli(rdata, plen, rspp, spp);
1780 prov = fc_passive_prov[rspp->spp_type];
1782 passive = prov->prli(rdata, plen, rspp, spp);
1783 if (!resp || passive == FC_SPP_RESP_ACK)
1788 if (spp->spp_flags & FC_SPP_EST_IMG_PAIR)
1789 resp |= FC_SPP_RESP_CONF;
1791 resp |= FC_SPP_RESP_INVL;
1793 spp->spp_flags |= resp;
1795 rspp = (struct fc_els_spp *)((char *)rspp + plen);
1796 spp = (struct fc_els_spp *)((char *)spp + plen);
1798 mutex_unlock(&fc_prov_mutex);
1801 * Send LS_ACC. If this fails, the originator should retry.
1803 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1804 lport->tt.frame_send(lport, fp);
1806 switch (rdata->rp_state) {
1808 fc_rport_enter_ready(rdata);
1816 rjt_data.reason = ELS_RJT_PROT;
1817 rjt_data.explan = ELS_EXPL_INV_LEN;
1819 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1821 fc_frame_free(rx_fp);
1825 * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
1826 * @rdata: The remote port that sent the PRLO request
1827 * @rx_fp: The PRLO request frame
1829 * Locking Note: The rport lock is expected to be held before calling
1832 static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
1833 struct fc_frame *rx_fp)
1835 struct fc_lport *lport = rdata->local_port;
1836 struct fc_frame *fp;
1838 struct fc_els_prlo prlo;
1839 struct fc_els_spp spp;
1841 struct fc_els_spp *rspp; /* request service param page */
1842 struct fc_els_spp *spp; /* response spp */
1845 struct fc_seq_els_data rjt_data;
1847 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
1848 fc_rport_state(rdata));
1850 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1851 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1854 plen = ntohs(pp->prlo.prlo_len);
1862 fp = fc_frame_alloc(lport, len);
1864 rjt_data.reason = ELS_RJT_UNAB;
1865 rjt_data.explan = ELS_EXPL_INSUF_RES;
1869 pp = fc_frame_payload_get(fp, len);
1872 pp->prlo.prlo_cmd = ELS_LS_ACC;
1873 pp->prlo.prlo_obs = 0x10;
1874 pp->prlo.prlo_len = htons(len);
1876 spp->spp_type = rspp->spp_type;
1877 spp->spp_type_ext = rspp->spp_type_ext;
1878 spp->spp_flags = FC_SPP_RESP_ACK;
1880 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
1882 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1883 lport->tt.frame_send(lport, fp);
1887 rjt_data.reason = ELS_RJT_PROT;
1888 rjt_data.explan = ELS_EXPL_INV_LEN;
1890 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1892 fc_frame_free(rx_fp);
1896 * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests
1897 * @lport: The local port that received the LOGO request
1898 * @fp: The LOGO request frame
1900 * Locking Note: The rport lock is expected to be held before calling
1903 static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
1905 struct fc_rport_priv *rdata;
1908 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
1910 sid = fc_frame_sid(fp);
1912 rdata = lport->tt.rport_lookup(lport, sid);
1914 mutex_lock(&rdata->rp_mutex);
1915 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
1916 fc_rport_state(rdata));
1918 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
1919 mutex_unlock(&rdata->rp_mutex);
1920 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1922 FC_RPORT_ID_DBG(lport, sid,
1923 "Received LOGO from non-logged-in port\n");
1928 * fc_rport_flush_queue() - Flush the rport_event_queue
1930 static void fc_rport_flush_queue(void)
1932 flush_workqueue(rport_event_queue);
1936 * fc_rport_init() - Initialize the remote port layer for a local port
1937 * @lport: The local port to initialize the remote port layer for
1939 int fc_rport_init(struct fc_lport *lport)
1941 if (!lport->tt.rport_lookup)
1942 lport->tt.rport_lookup = fc_rport_lookup;
1944 if (!lport->tt.rport_create)
1945 lport->tt.rport_create = fc_rport_create;
1947 if (!lport->tt.rport_login)
1948 lport->tt.rport_login = fc_rport_login;
1950 if (!lport->tt.rport_logoff)
1951 lport->tt.rport_logoff = fc_rport_logoff;
1953 if (!lport->tt.rport_recv_req)
1954 lport->tt.rport_recv_req = fc_rport_recv_req;
1956 if (!lport->tt.rport_flush_queue)
1957 lport->tt.rport_flush_queue = fc_rport_flush_queue;
1959 if (!lport->tt.rport_destroy)
1960 lport->tt.rport_destroy = fc_rport_destroy;
1964 EXPORT_SYMBOL(fc_rport_init);
1967 * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator.
1968 * @rdata: remote port private
1969 * @spp_len: service parameter page length
1970 * @rspp: received service parameter page
1971 * @spp: response service parameter page
1973 * Returns the value for the response code to be placed in spp_flags;
1974 * Returns 0 if not an initiator.
1976 static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len,
1977 const struct fc_els_spp *rspp,
1978 struct fc_els_spp *spp)
1980 struct fc_lport *lport = rdata->local_port;
1983 fcp_parm = ntohl(rspp->spp_params);
1984 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1985 if (fcp_parm & FCP_SPPF_INIT_FCN)
1986 rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1987 if (fcp_parm & FCP_SPPF_TARG_FCN)
1988 rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET;
1989 if (fcp_parm & FCP_SPPF_RETRY)
1990 rdata->flags |= FC_RP_FLAGS_RETRY;
1991 rdata->supported_classes = FC_COS_CLASS3;
1993 if (!(lport->service_params & FCP_SPPF_INIT_FCN))
1996 spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
1999 * OR in our service parameters with other providers (target), if any.
2001 fcp_parm = ntohl(spp->spp_params);
2002 spp->spp_params = htonl(fcp_parm | lport->service_params);
2003 return FC_SPP_RESP_ACK;
2007 * FC-4 provider ops for FCP initiator.
2009 struct fc4_prov fc_rport_fcp_init = {
2010 .prli = fc_rport_fcp_prli,
2014 * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0
2015 * @rdata: remote port private
2016 * @spp_len: service parameter page length
2017 * @rspp: received service parameter page
2018 * @spp: response service parameter page
2020 static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len,
2021 const struct fc_els_spp *rspp,
2022 struct fc_els_spp *spp)
2024 if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR)
2025 return FC_SPP_RESP_INVL;
2026 return FC_SPP_RESP_ACK;
2030 * FC-4 provider ops for type 0 service parameters.
2032 * This handles the special case of type 0 which is always successful
2033 * but doesn't do anything otherwise.
2035 struct fc4_prov fc_rport_t0_prov = {
2036 .prli = fc_rport_t0_prli,
2040 * fc_setup_rport() - Initialize the rport_event_queue
2042 int fc_setup_rport(void)
2044 rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
2045 if (!rport_event_queue)
2051 * fc_destroy_rport() - Destroy the rport_event_queue
2053 void fc_destroy_rport(void)
2055 destroy_workqueue(rport_event_queue);
2059 * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port
2060 * @rport: The remote port whose I/O should be terminated
2062 void fc_rport_terminate_io(struct fc_rport *rport)
2064 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
2065 struct fc_lport *lport = rpriv->local_port;
2067 lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
2068 lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
2070 EXPORT_SYMBOL(fc_rport_terminate_io);