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 caller must hold either disc_mutex or rcu_read_lock().
100 static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
103 struct fc_rport_priv *rdata;
105 list_for_each_entry_rcu(rdata, &lport->disc.rports, peers)
106 if (rdata->ids.port_id == port_id)
112 * fc_rport_create() - Create a new remote port
113 * @lport: The local port this remote port will be associated with
114 * @ids: The identifiers for the new remote port
116 * The remote port will start in the INIT state.
118 * Locking note: must be called with the disc_mutex held.
120 static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
123 struct fc_rport_priv *rdata;
125 rdata = lport->tt.rport_lookup(lport, port_id);
129 rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL);
133 rdata->ids.node_name = -1;
134 rdata->ids.port_name = -1;
135 rdata->ids.port_id = port_id;
136 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
138 kref_init(&rdata->kref);
139 mutex_init(&rdata->rp_mutex);
140 rdata->local_port = lport;
141 rdata->rp_state = RPORT_ST_INIT;
142 rdata->event = RPORT_EV_NONE;
143 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
144 rdata->e_d_tov = lport->e_d_tov;
145 rdata->r_a_tov = lport->r_a_tov;
146 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
147 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
148 INIT_WORK(&rdata->event_work, fc_rport_work);
149 if (port_id != FC_FID_DIR_SERV) {
150 rdata->lld_event_callback = lport->tt.rport_event_callback;
151 list_add_rcu(&rdata->peers, &lport->disc.rports);
157 * fc_rport_destroy() - Free a remote port after last reference is released
158 * @kref: The remote port's kref
160 static void fc_rport_destroy(struct kref *kref)
162 struct fc_rport_priv *rdata;
164 rdata = container_of(kref, struct fc_rport_priv, kref);
165 kfree_rcu(rdata, rcu);
169 * fc_rport_state() - Return a string identifying the remote port's state
170 * @rdata: The remote port
172 static const char *fc_rport_state(struct fc_rport_priv *rdata)
176 cp = fc_rport_state_names[rdata->rp_state];
183 * fc_set_rport_loss_tmo() - Set the remote port loss timeout
184 * @rport: The remote port that gets a new timeout value
185 * @timeout: The new timeout value (in seconds)
187 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
190 rport->dev_loss_tmo = timeout;
192 rport->dev_loss_tmo = 1;
194 EXPORT_SYMBOL(fc_set_rport_loss_tmo);
197 * fc_plogi_get_maxframe() - Get the maximum payload from the common service
198 * parameters in a FLOGI frame
199 * @flp: The FLOGI or PLOGI payload
200 * @maxval: The maximum frame size upper limit; this may be less than what
201 * is in the service parameters
203 static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
209 * Get max payload from the common service parameters and the
210 * class 3 receive data field size.
212 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
213 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
215 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
216 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
222 * fc_rport_state_enter() - Change the state of a remote port
223 * @rdata: The remote port whose state should change
224 * @new: The new state
226 * Locking Note: Called with the rport lock held
228 static void fc_rport_state_enter(struct fc_rport_priv *rdata,
229 enum fc_rport_state new)
231 if (rdata->rp_state != new)
233 rdata->rp_state = new;
237 * fc_rport_work() - Handler for remote port events in the rport_event_queue
238 * @work: Handle to the remote port being dequeued
240 static void fc_rport_work(struct work_struct *work)
243 struct fc_rport_priv *rdata =
244 container_of(work, struct fc_rport_priv, event_work);
245 struct fc_rport_libfc_priv *rpriv;
246 enum fc_rport_event event;
247 struct fc_lport *lport = rdata->local_port;
248 struct fc_rport_operations *rport_ops;
249 struct fc_rport_identifiers ids;
250 struct fc_rport *rport;
251 struct fc4_prov *prov;
254 mutex_lock(&rdata->rp_mutex);
255 event = rdata->event;
256 rport_ops = rdata->ops;
257 rport = rdata->rport;
259 FC_RPORT_DBG(rdata, "work event %u\n", event);
264 rdata->event = RPORT_EV_NONE;
265 rdata->major_retries = 0;
266 kref_get(&rdata->kref);
267 mutex_unlock(&rdata->rp_mutex);
270 rport = fc_remote_port_add(lport->host, 0, &ids);
272 FC_RPORT_DBG(rdata, "Failed to add the rport\n");
273 lport->tt.rport_logoff(rdata);
274 kref_put(&rdata->kref, lport->tt.rport_destroy);
277 mutex_lock(&rdata->rp_mutex);
279 FC_RPORT_DBG(rdata, "rport already allocated\n");
280 rdata->rport = rport;
281 rport->maxframe_size = rdata->maxframe_size;
282 rport->supported_classes = rdata->supported_classes;
284 rpriv = rport->dd_data;
285 rpriv->local_port = lport;
286 rpriv->rp_state = rdata->rp_state;
287 rpriv->flags = rdata->flags;
288 rpriv->e_d_tov = rdata->e_d_tov;
289 rpriv->r_a_tov = rdata->r_a_tov;
290 mutex_unlock(&rdata->rp_mutex);
292 if (rport_ops && rport_ops->event_callback) {
293 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
294 rport_ops->event_callback(lport, rdata, event);
296 if (rdata->lld_event_callback) {
297 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
298 rdata->lld_event_callback(lport, rdata, event);
300 kref_put(&rdata->kref, lport->tt.rport_destroy);
303 case RPORT_EV_FAILED:
306 if (rdata->prli_count) {
307 mutex_lock(&fc_prov_mutex);
308 for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
309 prov = fc_passive_prov[type];
310 if (prov && prov->prlo)
313 mutex_unlock(&fc_prov_mutex);
315 port_id = rdata->ids.port_id;
316 mutex_unlock(&rdata->rp_mutex);
318 if (rport_ops && rport_ops->event_callback) {
319 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
320 rport_ops->event_callback(lport, rdata, event);
322 if (rdata->lld_event_callback) {
323 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
324 rdata->lld_event_callback(lport, rdata, event);
326 cancel_delayed_work_sync(&rdata->retry_work);
329 * Reset any outstanding exchanges before freeing rport.
331 lport->tt.exch_mgr_reset(lport, 0, port_id);
332 lport->tt.exch_mgr_reset(lport, port_id, 0);
335 rpriv = rport->dd_data;
336 rpriv->rp_state = RPORT_ST_DELETE;
337 mutex_lock(&rdata->rp_mutex);
339 mutex_unlock(&rdata->rp_mutex);
340 fc_remote_port_delete(rport);
343 mutex_lock(&lport->disc.disc_mutex);
344 mutex_lock(&rdata->rp_mutex);
345 if (rdata->rp_state == RPORT_ST_DELETE) {
346 if (port_id == FC_FID_DIR_SERV) {
347 rdata->event = RPORT_EV_NONE;
348 mutex_unlock(&rdata->rp_mutex);
349 kref_put(&rdata->kref, lport->tt.rport_destroy);
350 } else if ((rdata->flags & FC_RP_STARTED) &&
351 rdata->major_retries <
352 lport->max_rport_retry_count) {
353 rdata->major_retries++;
354 rdata->event = RPORT_EV_NONE;
355 FC_RPORT_DBG(rdata, "work restart\n");
356 fc_rport_enter_flogi(rdata);
357 mutex_unlock(&rdata->rp_mutex);
359 FC_RPORT_DBG(rdata, "work delete\n");
360 list_del_rcu(&rdata->peers);
361 mutex_unlock(&rdata->rp_mutex);
362 kref_put(&rdata->kref, lport->tt.rport_destroy);
366 * Re-open for events. Reissue READY event if ready.
368 rdata->event = RPORT_EV_NONE;
369 if (rdata->rp_state == RPORT_ST_READY)
370 fc_rport_enter_ready(rdata);
371 mutex_unlock(&rdata->rp_mutex);
373 mutex_unlock(&lport->disc.disc_mutex);
377 mutex_unlock(&rdata->rp_mutex);
383 * fc_rport_login() - Start the remote port login state machine
384 * @rdata: The remote port to be logged in to
386 * Locking Note: Called without the rport lock held. This
387 * function will hold the rport lock, call an _enter_*
388 * function and then unlock the rport.
390 * This indicates the intent to be logged into the remote port.
391 * If it appears we are already logged in, ADISC is used to verify
394 static int fc_rport_login(struct fc_rport_priv *rdata)
396 mutex_lock(&rdata->rp_mutex);
398 rdata->flags |= FC_RP_STARTED;
399 switch (rdata->rp_state) {
401 FC_RPORT_DBG(rdata, "ADISC port\n");
402 fc_rport_enter_adisc(rdata);
404 case RPORT_ST_DELETE:
405 FC_RPORT_DBG(rdata, "Restart deleted port\n");
408 FC_RPORT_DBG(rdata, "Login to port\n");
409 fc_rport_enter_flogi(rdata);
412 mutex_unlock(&rdata->rp_mutex);
418 * fc_rport_enter_delete() - Schedule a remote port to be deleted
419 * @rdata: The remote port to be deleted
420 * @event: The event to report as the reason for deletion
422 * Locking Note: Called with the rport lock held.
424 * Allow state change into DELETE only once.
426 * Call queue_work only if there's no event already pending.
427 * Set the new event so that the old pending event will not occur.
428 * Since we have the mutex, even if fc_rport_work() is already started,
429 * it'll see the new event.
431 static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
432 enum fc_rport_event event)
434 if (rdata->rp_state == RPORT_ST_DELETE)
437 FC_RPORT_DBG(rdata, "Delete port\n");
439 fc_rport_state_enter(rdata, RPORT_ST_DELETE);
441 if (rdata->event == RPORT_EV_NONE)
442 queue_work(rport_event_queue, &rdata->event_work);
443 rdata->event = event;
447 * fc_rport_logoff() - Logoff and remove a remote port
448 * @rdata: The remote port to be logged off of
450 * Locking Note: Called without the rport lock held. This
451 * function will hold the rport lock, call an _enter_*
452 * function and then unlock the rport.
454 static int fc_rport_logoff(struct fc_rport_priv *rdata)
456 mutex_lock(&rdata->rp_mutex);
458 FC_RPORT_DBG(rdata, "Remove port\n");
460 rdata->flags &= ~FC_RP_STARTED;
461 if (rdata->rp_state == RPORT_ST_DELETE) {
462 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
465 fc_rport_enter_logo(rdata);
468 * Change the state to Delete so that we discard
471 fc_rport_enter_delete(rdata, RPORT_EV_STOP);
473 mutex_unlock(&rdata->rp_mutex);
478 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
479 * @rdata: The remote port that is ready
481 * Locking Note: The rport lock is expected to be held before calling
484 static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
486 fc_rport_state_enter(rdata, RPORT_ST_READY);
488 FC_RPORT_DBG(rdata, "Port is Ready\n");
490 if (rdata->event == RPORT_EV_NONE)
491 queue_work(rport_event_queue, &rdata->event_work);
492 rdata->event = RPORT_EV_READY;
496 * fc_rport_timeout() - Handler for the retry_work timer
497 * @work: Handle to the remote port that has timed out
499 * Locking Note: Called without the rport lock held. This
500 * function will hold the rport lock, call an _enter_*
501 * function and then unlock the rport.
503 static void fc_rport_timeout(struct work_struct *work)
505 struct fc_rport_priv *rdata =
506 container_of(work, struct fc_rport_priv, retry_work.work);
508 mutex_lock(&rdata->rp_mutex);
510 switch (rdata->rp_state) {
512 fc_rport_enter_flogi(rdata);
515 fc_rport_enter_plogi(rdata);
518 fc_rport_enter_prli(rdata);
521 fc_rport_enter_rtv(rdata);
524 fc_rport_enter_adisc(rdata);
526 case RPORT_ST_PLOGI_WAIT:
529 case RPORT_ST_DELETE:
533 mutex_unlock(&rdata->rp_mutex);
537 * fc_rport_error() - Error handler, called once retries have been exhausted
538 * @rdata: The remote port the error is happened on
539 * @fp: The error code encapsulated in a frame pointer
541 * Locking Note: The rport lock is expected to be held before
542 * calling this routine
544 static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp)
546 FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n",
547 IS_ERR(fp) ? -PTR_ERR(fp) : 0,
548 fc_rport_state(rdata), rdata->retries);
550 switch (rdata->rp_state) {
553 rdata->flags &= ~FC_RP_STARTED;
554 fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
557 fc_rport_enter_ready(rdata);
561 fc_rport_enter_logo(rdata);
563 case RPORT_ST_PLOGI_WAIT:
564 case RPORT_ST_DELETE:
572 * fc_rport_error_retry() - Handler for remote port state retries
573 * @rdata: The remote port whose state is to be retried
574 * @fp: The error code encapsulated in a frame pointer
576 * If the error was an exchange timeout retry immediately,
577 * otherwise wait for E_D_TOV.
579 * Locking Note: The rport lock is expected to be held before
580 * calling this routine
582 static void fc_rport_error_retry(struct fc_rport_priv *rdata,
585 unsigned long delay = msecs_to_jiffies(FC_DEF_E_D_TOV);
587 /* make sure this isn't an FC_EX_CLOSED error, never retry those */
588 if (PTR_ERR(fp) == -FC_EX_CLOSED)
591 if (rdata->retries < rdata->local_port->max_rport_retry_count) {
592 FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n",
593 PTR_ERR(fp), fc_rport_state(rdata));
595 /* no additional delay on exchange timeouts */
596 if (PTR_ERR(fp) == -FC_EX_TIMEOUT)
598 schedule_delayed_work(&rdata->retry_work, delay);
603 fc_rport_error(rdata, fp);
607 * fc_rport_login_complete() - Handle parameters and completion of p-mp login.
608 * @rdata: The remote port which we logged into or which logged into us.
609 * @fp: The FLOGI or PLOGI request or response frame
611 * Returns non-zero error if a problem is detected with the frame.
612 * Does not free the frame.
614 * This is only used in point-to-multipoint mode for FIP currently.
616 static int fc_rport_login_complete(struct fc_rport_priv *rdata,
619 struct fc_lport *lport = rdata->local_port;
620 struct fc_els_flogi *flogi;
621 unsigned int e_d_tov;
624 flogi = fc_frame_payload_get(fp, sizeof(*flogi));
628 csp_flags = ntohs(flogi->fl_csp.sp_features);
630 if (fc_frame_payload_op(fp) == ELS_FLOGI) {
631 if (csp_flags & FC_SP_FT_FPORT) {
632 FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n");
638 * E_D_TOV is not valid on an incoming FLOGI request.
640 e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov);
641 if (csp_flags & FC_SP_FT_EDTR)
643 if (e_d_tov > rdata->e_d_tov)
644 rdata->e_d_tov = e_d_tov;
646 rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs);
651 * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode
652 * @sp: The sequence that the FLOGI was on
653 * @fp: The FLOGI response frame
654 * @rp_arg: The remote port that received the FLOGI response
656 static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
659 struct fc_rport_priv *rdata = rp_arg;
660 struct fc_lport *lport = rdata->local_port;
661 struct fc_els_flogi *flogi;
662 unsigned int r_a_tov;
664 FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", fc_els_resp_type(fp));
666 if (fp == ERR_PTR(-FC_EX_CLOSED))
669 mutex_lock(&rdata->rp_mutex);
671 if (rdata->rp_state != RPORT_ST_FLOGI) {
672 FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state "
673 "%s\n", fc_rport_state(rdata));
680 fc_rport_error(rdata, fp);
684 if (fc_frame_payload_op(fp) != ELS_LS_ACC)
686 if (fc_rport_login_complete(rdata, fp))
689 flogi = fc_frame_payload_get(fp, sizeof(*flogi));
692 r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
693 if (r_a_tov > rdata->r_a_tov)
694 rdata->r_a_tov = r_a_tov;
696 if (rdata->ids.port_name < lport->wwpn)
697 fc_rport_enter_plogi(rdata);
699 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
703 mutex_unlock(&rdata->rp_mutex);
705 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
708 FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
709 fc_rport_error_retry(rdata, fp);
714 * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp
715 * @rdata: The remote port to send a FLOGI to
717 * Locking Note: The rport lock is expected to be held before calling
720 static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
722 struct fc_lport *lport = rdata->local_port;
725 if (!lport->point_to_multipoint)
726 return fc_rport_enter_plogi(rdata);
728 FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n",
729 fc_rport_state(rdata));
731 fc_rport_state_enter(rdata, RPORT_ST_FLOGI);
733 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
735 return fc_rport_error_retry(rdata, fp);
737 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI,
738 fc_rport_flogi_resp, rdata,
740 fc_rport_error_retry(rdata, NULL);
742 kref_get(&rdata->kref);
746 * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode
747 * @lport: The local port that received the PLOGI request
748 * @rx_fp: The PLOGI request frame
750 static void fc_rport_recv_flogi_req(struct fc_lport *lport,
751 struct fc_frame *rx_fp)
753 struct fc_disc *disc;
754 struct fc_els_flogi *flp;
755 struct fc_rport_priv *rdata;
756 struct fc_frame *fp = rx_fp;
757 struct fc_seq_els_data rjt_data;
760 sid = fc_frame_sid(fp);
762 FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
765 mutex_lock(&disc->disc_mutex);
767 if (!lport->point_to_multipoint) {
768 rjt_data.reason = ELS_RJT_UNSUP;
769 rjt_data.explan = ELS_EXPL_NONE;
773 flp = fc_frame_payload_get(fp, sizeof(*flp));
775 rjt_data.reason = ELS_RJT_LOGIC;
776 rjt_data.explan = ELS_EXPL_INV_LEN;
780 rdata = lport->tt.rport_lookup(lport, sid);
782 rjt_data.reason = ELS_RJT_FIP;
783 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
786 mutex_lock(&rdata->rp_mutex);
788 FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
789 fc_rport_state(rdata));
791 switch (rdata->rp_state) {
794 * If received the FLOGI request on RPORT which is INIT state
795 * (means not transition to FLOGI either fc_rport timeout
796 * function didn;t trigger or this end hasn;t received
797 * beacon yet from other end. In that case only, allow RPORT
798 * state machine to continue, otherwise fall through which
799 * causes the code to send reject response.
800 * NOTE; Not checking for FIP->state such as VNMP_UP or
801 * VNMP_CLAIM because if FIP state is not one of those,
802 * RPORT wouldn;t have created and 'rport_lookup' would have
803 * failed anyway in that case.
805 if (lport->point_to_multipoint)
807 case RPORT_ST_DELETE:
808 mutex_unlock(&rdata->rp_mutex);
809 rjt_data.reason = ELS_RJT_FIP;
810 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
813 case RPORT_ST_PLOGI_WAIT:
821 * Set the remote port to be deleted and to then restart.
822 * This queues work to be sure exchanges are reset.
824 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
825 mutex_unlock(&rdata->rp_mutex);
826 rjt_data.reason = ELS_RJT_BUSY;
827 rjt_data.explan = ELS_EXPL_NONE;
830 if (fc_rport_login_complete(rdata, fp)) {
831 mutex_unlock(&rdata->rp_mutex);
832 rjt_data.reason = ELS_RJT_LOGIC;
833 rjt_data.explan = ELS_EXPL_NONE;
837 fp = fc_frame_alloc(lport, sizeof(*flp));
841 fc_flogi_fill(lport, fp);
842 flp = fc_frame_payload_get(fp, sizeof(*flp));
843 flp->fl_cmd = ELS_LS_ACC;
845 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
846 lport->tt.frame_send(lport, fp);
848 if (rdata->ids.port_name < lport->wwpn)
849 fc_rport_enter_plogi(rdata);
851 fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
853 mutex_unlock(&rdata->rp_mutex);
854 mutex_unlock(&disc->disc_mutex);
855 fc_frame_free(rx_fp);
859 mutex_unlock(&disc->disc_mutex);
860 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
861 fc_frame_free(rx_fp);
865 * fc_rport_plogi_resp() - Handler for ELS PLOGI responses
866 * @sp: The sequence the PLOGI is on
867 * @fp: The PLOGI response frame
868 * @rdata_arg: The remote port that sent the PLOGI response
870 * Locking Note: This function will be called without the rport lock
871 * held, but it will lock, call an _enter_* function or fc_rport_error
872 * and then unlock the rport.
874 static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
877 struct fc_rport_priv *rdata = rdata_arg;
878 struct fc_lport *lport = rdata->local_port;
879 struct fc_els_flogi *plp = NULL;
884 mutex_lock(&rdata->rp_mutex);
886 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
888 if (rdata->rp_state != RPORT_ST_PLOGI) {
889 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
890 "%s\n", fc_rport_state(rdata));
897 fc_rport_error_retry(rdata, fp);
901 op = fc_frame_payload_op(fp);
902 if (op == ELS_LS_ACC &&
903 (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
904 rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
905 rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn);
907 /* save plogi response sp_features for further reference */
908 rdata->sp_features = ntohs(plp->fl_csp.sp_features);
910 if (lport->point_to_multipoint)
911 fc_rport_login_complete(rdata, fp);
912 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
913 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
914 if (cssp_seq < csp_seq)
916 rdata->max_seq = csp_seq;
917 rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs);
918 fc_rport_enter_prli(rdata);
920 fc_rport_error_retry(rdata, fp);
925 mutex_unlock(&rdata->rp_mutex);
926 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
930 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request
931 * @rdata: The remote port to send a PLOGI to
933 * Locking Note: The rport lock is expected to be held before calling
936 static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
938 struct fc_lport *lport = rdata->local_port;
941 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
942 fc_rport_state(rdata));
944 fc_rport_state_enter(rdata, RPORT_ST_PLOGI);
946 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
947 fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
949 FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__);
950 fc_rport_error_retry(rdata, fp);
953 rdata->e_d_tov = lport->e_d_tov;
955 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
956 fc_rport_plogi_resp, rdata,
958 fc_rport_error_retry(rdata, NULL);
960 kref_get(&rdata->kref);
964 * fc_rport_prli_resp() - Process Login (PRLI) response handler
965 * @sp: The sequence the PRLI response was on
966 * @fp: The PRLI response frame
967 * @rdata_arg: The remote port that sent the PRLI response
969 * Locking Note: This function will be called without the rport lock
970 * held, but it will lock, call an _enter_* function or fc_rport_error
971 * and then unlock the rport.
973 static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
976 struct fc_rport_priv *rdata = rdata_arg;
978 struct fc_els_prli prli;
979 struct fc_els_spp spp;
981 struct fc_els_spp temp_spp;
982 struct fc4_prov *prov;
983 u32 roles = FC_RPORT_ROLE_UNKNOWN;
988 mutex_lock(&rdata->rp_mutex);
990 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
992 if (rdata->rp_state != RPORT_ST_PRLI) {
993 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
994 "%s\n", fc_rport_state(rdata));
1001 fc_rport_error_retry(rdata, fp);
1005 /* reinitialize remote port roles */
1006 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1008 op = fc_frame_payload_op(fp);
1009 if (op == ELS_LS_ACC) {
1010 pp = fc_frame_payload_get(fp, sizeof(*pp));
1014 resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
1015 FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n",
1017 rdata->spp_type = pp->spp.spp_type;
1018 if (resp_code != FC_SPP_RESP_ACK) {
1019 if (resp_code == FC_SPP_RESP_CONF)
1020 fc_rport_error(rdata, fp);
1022 fc_rport_error_retry(rdata, fp);
1025 if (pp->prli.prli_spp_len < sizeof(pp->spp))
1028 fcp_parm = ntohl(pp->spp.spp_params);
1029 if (fcp_parm & FCP_SPPF_RETRY)
1030 rdata->flags |= FC_RP_FLAGS_RETRY;
1031 if (fcp_parm & FCP_SPPF_CONF_COMPL)
1032 rdata->flags |= FC_RP_FLAGS_CONF_REQ;
1034 prov = fc_passive_prov[FC_TYPE_FCP];
1036 memset(&temp_spp, 0, sizeof(temp_spp));
1037 prov->prli(rdata, pp->prli.prli_spp_len,
1038 &pp->spp, &temp_spp);
1041 rdata->supported_classes = FC_COS_CLASS3;
1042 if (fcp_parm & FCP_SPPF_INIT_FCN)
1043 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1044 if (fcp_parm & FCP_SPPF_TARG_FCN)
1045 roles |= FC_RPORT_ROLE_FCP_TARGET;
1047 rdata->ids.roles = roles;
1048 fc_rport_enter_rtv(rdata);
1051 FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n");
1052 fc_rport_error_retry(rdata, fp);
1058 mutex_unlock(&rdata->rp_mutex);
1059 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1063 * fc_rport_enter_prli() - Send Process Login (PRLI) request
1064 * @rdata: The remote port to send the PRLI request to
1066 * Locking Note: The rport lock is expected to be held before calling
1069 static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
1071 struct fc_lport *lport = rdata->local_port;
1073 struct fc_els_prli prli;
1074 struct fc_els_spp spp;
1076 struct fc_frame *fp;
1077 struct fc4_prov *prov;
1080 * If the rport is one of the well known addresses
1081 * we skip PRLI and RTV and go straight to READY.
1083 if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
1084 fc_rport_enter_ready(rdata);
1088 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
1089 fc_rport_state(rdata));
1091 fc_rport_state_enter(rdata, RPORT_ST_PRLI);
1093 fp = fc_frame_alloc(lport, sizeof(*pp));
1095 fc_rport_error_retry(rdata, fp);
1099 fc_prli_fill(lport, fp);
1101 prov = fc_passive_prov[FC_TYPE_FCP];
1103 pp = fc_frame_payload_get(fp, sizeof(*pp));
1104 prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
1107 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id,
1108 fc_host_port_id(lport->host), FC_TYPE_ELS,
1109 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1111 if (!lport->tt.exch_seq_send(lport, fp, fc_rport_prli_resp,
1112 NULL, rdata, 2 * lport->r_a_tov))
1113 fc_rport_error_retry(rdata, NULL);
1115 kref_get(&rdata->kref);
1119 * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses
1120 * @sp: The sequence the RTV was on
1121 * @fp: The RTV response frame
1122 * @rdata_arg: The remote port that sent the RTV response
1124 * Many targets don't seem to support this.
1126 * Locking Note: This function will be called without the rport lock
1127 * held, but it will lock, call an _enter_* function or fc_rport_error
1128 * and then unlock the rport.
1130 static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
1133 struct fc_rport_priv *rdata = rdata_arg;
1136 mutex_lock(&rdata->rp_mutex);
1138 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
1140 if (rdata->rp_state != RPORT_ST_RTV) {
1141 FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
1142 "%s\n", fc_rport_state(rdata));
1149 fc_rport_error(rdata, fp);
1153 op = fc_frame_payload_op(fp);
1154 if (op == ELS_LS_ACC) {
1155 struct fc_els_rtv_acc *rtv;
1159 rtv = fc_frame_payload_get(fp, sizeof(*rtv));
1161 toq = ntohl(rtv->rtv_toq);
1162 tov = ntohl(rtv->rtv_r_a_tov);
1165 rdata->r_a_tov = tov;
1166 tov = ntohl(rtv->rtv_e_d_tov);
1167 if (toq & FC_ELS_RTV_EDRES)
1171 rdata->e_d_tov = tov;
1175 fc_rport_enter_ready(rdata);
1180 mutex_unlock(&rdata->rp_mutex);
1181 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1185 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request
1186 * @rdata: The remote port to send the RTV request to
1188 * Locking Note: The rport lock is expected to be held before calling
1191 static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
1193 struct fc_frame *fp;
1194 struct fc_lport *lport = rdata->local_port;
1196 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
1197 fc_rport_state(rdata));
1199 fc_rport_state_enter(rdata, RPORT_ST_RTV);
1201 fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
1203 fc_rport_error_retry(rdata, fp);
1207 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
1208 fc_rport_rtv_resp, rdata,
1209 2 * lport->r_a_tov))
1210 fc_rport_error_retry(rdata, NULL);
1212 kref_get(&rdata->kref);
1216 * fc_rport_logo_resp() - Handler for logout (LOGO) responses
1217 * @sp: The sequence the LOGO was on
1218 * @fp: The LOGO response frame
1219 * @lport_arg: The local port
1221 static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1224 struct fc_lport *lport = lport_arg;
1226 FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
1227 "Received a LOGO %s\n", fc_els_resp_type(fp));
1234 * fc_rport_enter_logo() - Send a logout (LOGO) request
1235 * @rdata: The remote port to send the LOGO request to
1237 * Locking Note: The rport lock is expected to be held before calling
1240 static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
1242 struct fc_lport *lport = rdata->local_port;
1243 struct fc_frame *fp;
1245 FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
1246 fc_rport_state(rdata));
1248 fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
1251 (void)lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
1252 fc_rport_logo_resp, lport, 0);
1256 * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses
1257 * @sp: The sequence the ADISC response was on
1258 * @fp: The ADISC response frame
1259 * @rdata_arg: The remote port that sent the ADISC response
1261 * Locking Note: This function will be called without the rport lock
1262 * held, but it will lock, call an _enter_* function or fc_rport_error
1263 * and then unlock the rport.
1265 static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
1268 struct fc_rport_priv *rdata = rdata_arg;
1269 struct fc_els_adisc *adisc;
1272 mutex_lock(&rdata->rp_mutex);
1274 FC_RPORT_DBG(rdata, "Received a ADISC response\n");
1276 if (rdata->rp_state != RPORT_ST_ADISC) {
1277 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
1278 fc_rport_state(rdata));
1285 fc_rport_error(rdata, fp);
1290 * If address verification failed. Consider us logged out of the rport.
1291 * Since the rport is still in discovery, we want to be
1292 * logged in, so go to PLOGI state. Otherwise, go back to READY.
1294 op = fc_frame_payload_op(fp);
1295 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1296 if (op != ELS_LS_ACC || !adisc ||
1297 ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
1298 get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
1299 get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) {
1300 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
1301 fc_rport_enter_flogi(rdata);
1303 FC_RPORT_DBG(rdata, "ADISC OK\n");
1304 fc_rport_enter_ready(rdata);
1309 mutex_unlock(&rdata->rp_mutex);
1310 kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
1314 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request
1315 * @rdata: The remote port to send the ADISC request to
1317 * Locking Note: The rport lock is expected to be held before calling
1320 static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
1322 struct fc_lport *lport = rdata->local_port;
1323 struct fc_frame *fp;
1325 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
1326 fc_rport_state(rdata));
1328 fc_rport_state_enter(rdata, RPORT_ST_ADISC);
1330 fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
1332 fc_rport_error_retry(rdata, fp);
1335 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
1336 fc_rport_adisc_resp, rdata,
1337 2 * lport->r_a_tov))
1338 fc_rport_error_retry(rdata, NULL);
1340 kref_get(&rdata->kref);
1344 * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests
1345 * @rdata: The remote port that sent the ADISC request
1346 * @in_fp: The ADISC request frame
1348 * Locking Note: Called with the lport and rport locks held.
1350 static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
1351 struct fc_frame *in_fp)
1353 struct fc_lport *lport = rdata->local_port;
1354 struct fc_frame *fp;
1355 struct fc_els_adisc *adisc;
1356 struct fc_seq_els_data rjt_data;
1358 FC_RPORT_DBG(rdata, "Received ADISC request\n");
1360 adisc = fc_frame_payload_get(in_fp, sizeof(*adisc));
1362 rjt_data.reason = ELS_RJT_PROT;
1363 rjt_data.explan = ELS_EXPL_INV_LEN;
1364 lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
1368 fp = fc_frame_alloc(lport, sizeof(*adisc));
1371 fc_adisc_fill(lport, fp);
1372 adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1373 adisc->adisc_cmd = ELS_LS_ACC;
1374 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
1375 lport->tt.frame_send(lport, fp);
1377 fc_frame_free(in_fp);
1381 * fc_rport_recv_rls_req() - Handle received Read Link Status request
1382 * @rdata: The remote port that sent the RLS request
1383 * @rx_fp: The PRLI request frame
1385 * Locking Note: The rport lock is expected to be held before calling
1388 static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
1389 struct fc_frame *rx_fp)
1392 struct fc_lport *lport = rdata->local_port;
1393 struct fc_frame *fp;
1394 struct fc_els_rls *rls;
1395 struct fc_els_rls_resp *rsp;
1396 struct fc_els_lesb *lesb;
1397 struct fc_seq_els_data rjt_data;
1398 struct fc_host_statistics *hst;
1400 FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
1401 fc_rport_state(rdata));
1403 rls = fc_frame_payload_get(rx_fp, sizeof(*rls));
1405 rjt_data.reason = ELS_RJT_PROT;
1406 rjt_data.explan = ELS_EXPL_INV_LEN;
1410 fp = fc_frame_alloc(lport, sizeof(*rsp));
1412 rjt_data.reason = ELS_RJT_UNAB;
1413 rjt_data.explan = ELS_EXPL_INSUF_RES;
1417 rsp = fc_frame_payload_get(fp, sizeof(*rsp));
1418 memset(rsp, 0, sizeof(*rsp));
1419 rsp->rls_cmd = ELS_LS_ACC;
1420 lesb = &rsp->rls_lesb;
1421 if (lport->tt.get_lesb) {
1422 /* get LESB from LLD if it supports it */
1423 lport->tt.get_lesb(lport, lesb);
1425 fc_get_host_stats(lport->host);
1426 hst = &lport->host_stats;
1427 lesb->lesb_link_fail = htonl(hst->link_failure_count);
1428 lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
1429 lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
1430 lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
1431 lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
1432 lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
1435 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1436 lport->tt.frame_send(lport, fp);
1440 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1442 fc_frame_free(rx_fp);
1446 * fc_rport_recv_els_req() - Handler for validated ELS requests
1447 * @lport: The local port that received the ELS request
1448 * @fp: The ELS request frame
1450 * Handle incoming ELS requests that require port login.
1451 * The ELS opcode has already been validated by the caller.
1453 * Locking Note: Called with the lport lock held.
1455 static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp)
1457 struct fc_rport_priv *rdata;
1458 struct fc_seq_els_data els_data;
1460 mutex_lock(&lport->disc.disc_mutex);
1461 rdata = lport->tt.rport_lookup(lport, fc_frame_sid(fp));
1463 mutex_unlock(&lport->disc.disc_mutex);
1466 mutex_lock(&rdata->rp_mutex);
1467 mutex_unlock(&lport->disc.disc_mutex);
1469 switch (rdata->rp_state) {
1472 case RPORT_ST_READY:
1473 case RPORT_ST_ADISC:
1476 mutex_unlock(&rdata->rp_mutex);
1480 switch (fc_frame_payload_op(fp)) {
1482 fc_rport_recv_prli_req(rdata, fp);
1485 fc_rport_recv_prlo_req(rdata, fp);
1488 fc_rport_recv_adisc_req(rdata, fp);
1491 lport->tt.seq_els_rsp_send(fp, ELS_RRQ, NULL);
1495 lport->tt.seq_els_rsp_send(fp, ELS_REC, NULL);
1499 fc_rport_recv_rls_req(rdata, fp);
1502 fc_frame_free(fp); /* can't happen */
1506 mutex_unlock(&rdata->rp_mutex);
1510 els_data.reason = ELS_RJT_UNAB;
1511 els_data.explan = ELS_EXPL_PLOGI_REQD;
1512 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1517 * fc_rport_recv_req() - Handler for requests
1518 * @lport: The local port that received the request
1519 * @fp: The request frame
1521 * Locking Note: Called with the lport lock held.
1523 static void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp)
1525 struct fc_seq_els_data els_data;
1528 * Handle FLOGI, PLOGI and LOGO requests separately, since they
1529 * don't require prior login.
1530 * Check for unsupported opcodes first and reject them.
1531 * For some ops, it would be incorrect to reject with "PLOGI required".
1533 switch (fc_frame_payload_op(fp)) {
1535 fc_rport_recv_flogi_req(lport, fp);
1538 fc_rport_recv_plogi_req(lport, fp);
1541 fc_rport_recv_logo_req(lport, fp);
1549 fc_rport_recv_els_req(lport, fp);
1552 els_data.reason = ELS_RJT_UNSUP;
1553 els_data.explan = ELS_EXPL_NONE;
1554 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1561 * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests
1562 * @lport: The local port that received the PLOGI request
1563 * @rx_fp: The PLOGI request frame
1565 * Locking Note: The rport lock is held before calling this function.
1567 static void fc_rport_recv_plogi_req(struct fc_lport *lport,
1568 struct fc_frame *rx_fp)
1570 struct fc_disc *disc;
1571 struct fc_rport_priv *rdata;
1572 struct fc_frame *fp = rx_fp;
1573 struct fc_els_flogi *pl;
1574 struct fc_seq_els_data rjt_data;
1577 sid = fc_frame_sid(fp);
1579 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
1581 pl = fc_frame_payload_get(fp, sizeof(*pl));
1583 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
1584 rjt_data.reason = ELS_RJT_PROT;
1585 rjt_data.explan = ELS_EXPL_INV_LEN;
1589 disc = &lport->disc;
1590 mutex_lock(&disc->disc_mutex);
1591 rdata = lport->tt.rport_create(lport, sid);
1593 mutex_unlock(&disc->disc_mutex);
1594 rjt_data.reason = ELS_RJT_UNAB;
1595 rjt_data.explan = ELS_EXPL_INSUF_RES;
1599 mutex_lock(&rdata->rp_mutex);
1600 mutex_unlock(&disc->disc_mutex);
1602 rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
1603 rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn);
1606 * If the rport was just created, possibly due to the incoming PLOGI,
1607 * set the state appropriately and accept the PLOGI.
1609 * If we had also sent a PLOGI, and if the received PLOGI is from a
1610 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
1611 * "command already in progress".
1613 * XXX TBD: If the session was ready before, the PLOGI should result in
1614 * all outstanding exchanges being reset.
1616 switch (rdata->rp_state) {
1618 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
1620 case RPORT_ST_PLOGI_WAIT:
1621 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n");
1623 case RPORT_ST_PLOGI:
1624 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
1625 if (rdata->ids.port_name < lport->wwpn) {
1626 mutex_unlock(&rdata->rp_mutex);
1627 rjt_data.reason = ELS_RJT_INPROG;
1628 rjt_data.explan = ELS_EXPL_NONE;
1634 case RPORT_ST_READY:
1635 case RPORT_ST_ADISC:
1636 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
1637 "- ignored for now\n", rdata->rp_state);
1638 /* XXX TBD - should reset */
1640 case RPORT_ST_FLOGI:
1641 case RPORT_ST_DELETE:
1642 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
1643 fc_rport_state(rdata));
1644 mutex_unlock(&rdata->rp_mutex);
1645 rjt_data.reason = ELS_RJT_BUSY;
1646 rjt_data.explan = ELS_EXPL_NONE;
1651 * Get session payload size from incoming PLOGI.
1653 rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
1656 * Send LS_ACC. If this fails, the originator should retry.
1658 fp = fc_frame_alloc(lport, sizeof(*pl));
1662 fc_plogi_fill(lport, fp, ELS_LS_ACC);
1663 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1664 lport->tt.frame_send(lport, fp);
1665 fc_rport_enter_prli(rdata);
1667 mutex_unlock(&rdata->rp_mutex);
1668 fc_frame_free(rx_fp);
1672 lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
1677 * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests
1678 * @rdata: The remote port that sent the PRLI request
1679 * @rx_fp: The PRLI request frame
1681 * Locking Note: The rport lock is exected to be held before calling
1684 static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
1685 struct fc_frame *rx_fp)
1687 struct fc_lport *lport = rdata->local_port;
1688 struct fc_frame *fp;
1690 struct fc_els_prli prli;
1691 struct fc_els_spp spp;
1693 struct fc_els_spp *rspp; /* request service param page */
1694 struct fc_els_spp *spp; /* response spp */
1697 enum fc_els_spp_resp resp;
1698 enum fc_els_spp_resp passive;
1699 struct fc_seq_els_data rjt_data;
1700 struct fc4_prov *prov;
1702 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
1703 fc_rport_state(rdata));
1705 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1706 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1709 plen = ntohs(pp->prli.prli_len);
1710 if ((plen % 4) != 0 || plen > len || plen < 16)
1714 plen = pp->prli.prli_spp_len;
1715 if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1716 plen > len || len < sizeof(*pp) || plen < 12)
1720 fp = fc_frame_alloc(lport, len);
1722 rjt_data.reason = ELS_RJT_UNAB;
1723 rjt_data.explan = ELS_EXPL_INSUF_RES;
1726 pp = fc_frame_payload_get(fp, len);
1729 pp->prli.prli_cmd = ELS_LS_ACC;
1730 pp->prli.prli_spp_len = plen;
1731 pp->prli.prli_len = htons(len);
1732 len -= sizeof(struct fc_els_prli);
1735 * Go through all the service parameter pages and build
1736 * response. If plen indicates longer SPP than standard,
1737 * use that. The entire response has been pre-cleared above.
1740 mutex_lock(&fc_prov_mutex);
1741 while (len >= plen) {
1742 rdata->spp_type = rspp->spp_type;
1743 spp->spp_type = rspp->spp_type;
1744 spp->spp_type_ext = rspp->spp_type_ext;
1747 if (rspp->spp_type < FC_FC4_PROV_SIZE) {
1748 prov = fc_active_prov[rspp->spp_type];
1750 resp = prov->prli(rdata, plen, rspp, spp);
1751 prov = fc_passive_prov[rspp->spp_type];
1753 passive = prov->prli(rdata, plen, rspp, spp);
1754 if (!resp || passive == FC_SPP_RESP_ACK)
1759 if (spp->spp_flags & FC_SPP_EST_IMG_PAIR)
1760 resp |= FC_SPP_RESP_CONF;
1762 resp |= FC_SPP_RESP_INVL;
1764 spp->spp_flags |= resp;
1766 rspp = (struct fc_els_spp *)((char *)rspp + plen);
1767 spp = (struct fc_els_spp *)((char *)spp + plen);
1769 mutex_unlock(&fc_prov_mutex);
1772 * Send LS_ACC. If this fails, the originator should retry.
1774 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1775 lport->tt.frame_send(lport, fp);
1777 switch (rdata->rp_state) {
1779 fc_rport_enter_ready(rdata);
1787 rjt_data.reason = ELS_RJT_PROT;
1788 rjt_data.explan = ELS_EXPL_INV_LEN;
1790 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1792 fc_frame_free(rx_fp);
1796 * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
1797 * @rdata: The remote port that sent the PRLO request
1798 * @rx_fp: The PRLO request frame
1800 * Locking Note: The rport lock is exected to be held before calling
1803 static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
1804 struct fc_frame *rx_fp)
1806 struct fc_lport *lport = rdata->local_port;
1807 struct fc_frame *fp;
1809 struct fc_els_prlo prlo;
1810 struct fc_els_spp spp;
1812 struct fc_els_spp *rspp; /* request service param page */
1813 struct fc_els_spp *spp; /* response spp */
1816 struct fc_seq_els_data rjt_data;
1818 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
1819 fc_rport_state(rdata));
1821 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1822 pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
1825 plen = ntohs(pp->prlo.prlo_len);
1833 fp = fc_frame_alloc(lport, len);
1835 rjt_data.reason = ELS_RJT_UNAB;
1836 rjt_data.explan = ELS_EXPL_INSUF_RES;
1840 pp = fc_frame_payload_get(fp, len);
1843 pp->prlo.prlo_cmd = ELS_LS_ACC;
1844 pp->prlo.prlo_obs = 0x10;
1845 pp->prlo.prlo_len = htons(len);
1847 spp->spp_type = rspp->spp_type;
1848 spp->spp_type_ext = rspp->spp_type_ext;
1849 spp->spp_flags = FC_SPP_RESP_ACK;
1851 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
1853 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1854 lport->tt.frame_send(lport, fp);
1858 rjt_data.reason = ELS_RJT_PROT;
1859 rjt_data.explan = ELS_EXPL_INV_LEN;
1861 lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1863 fc_frame_free(rx_fp);
1867 * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests
1868 * @lport: The local port that received the LOGO request
1869 * @fp: The LOGO request frame
1871 * Locking Note: The rport lock is exected to be held before calling
1874 static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
1876 struct fc_rport_priv *rdata;
1879 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
1881 sid = fc_frame_sid(fp);
1883 mutex_lock(&lport->disc.disc_mutex);
1884 rdata = lport->tt.rport_lookup(lport, sid);
1886 mutex_lock(&rdata->rp_mutex);
1887 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
1888 fc_rport_state(rdata));
1890 fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
1891 mutex_unlock(&rdata->rp_mutex);
1893 FC_RPORT_ID_DBG(lport, sid,
1894 "Received LOGO from non-logged-in port\n");
1895 mutex_unlock(&lport->disc.disc_mutex);
1900 * fc_rport_flush_queue() - Flush the rport_event_queue
1902 static void fc_rport_flush_queue(void)
1904 flush_workqueue(rport_event_queue);
1908 * fc_rport_init() - Initialize the remote port layer for a local port
1909 * @lport: The local port to initialize the remote port layer for
1911 int fc_rport_init(struct fc_lport *lport)
1913 if (!lport->tt.rport_lookup)
1914 lport->tt.rport_lookup = fc_rport_lookup;
1916 if (!lport->tt.rport_create)
1917 lport->tt.rport_create = fc_rport_create;
1919 if (!lport->tt.rport_login)
1920 lport->tt.rport_login = fc_rport_login;
1922 if (!lport->tt.rport_logoff)
1923 lport->tt.rport_logoff = fc_rport_logoff;
1925 if (!lport->tt.rport_recv_req)
1926 lport->tt.rport_recv_req = fc_rport_recv_req;
1928 if (!lport->tt.rport_flush_queue)
1929 lport->tt.rport_flush_queue = fc_rport_flush_queue;
1931 if (!lport->tt.rport_destroy)
1932 lport->tt.rport_destroy = fc_rport_destroy;
1936 EXPORT_SYMBOL(fc_rport_init);
1939 * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator.
1940 * @rdata: remote port private
1941 * @spp_len: service parameter page length
1942 * @rspp: received service parameter page
1943 * @spp: response service parameter page
1945 * Returns the value for the response code to be placed in spp_flags;
1946 * Returns 0 if not an initiator.
1948 static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len,
1949 const struct fc_els_spp *rspp,
1950 struct fc_els_spp *spp)
1952 struct fc_lport *lport = rdata->local_port;
1955 fcp_parm = ntohl(rspp->spp_params);
1956 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1957 if (fcp_parm & FCP_SPPF_INIT_FCN)
1958 rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1959 if (fcp_parm & FCP_SPPF_TARG_FCN)
1960 rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET;
1961 if (fcp_parm & FCP_SPPF_RETRY)
1962 rdata->flags |= FC_RP_FLAGS_RETRY;
1963 rdata->supported_classes = FC_COS_CLASS3;
1965 if (!(lport->service_params & FCP_SPPF_INIT_FCN))
1968 spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
1971 * OR in our service parameters with other providers (target), if any.
1973 fcp_parm = ntohl(spp->spp_params);
1974 spp->spp_params = htonl(fcp_parm | lport->service_params);
1975 return FC_SPP_RESP_ACK;
1979 * FC-4 provider ops for FCP initiator.
1981 struct fc4_prov fc_rport_fcp_init = {
1982 .prli = fc_rport_fcp_prli,
1986 * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0
1987 * @rdata: remote port private
1988 * @spp_len: service parameter page length
1989 * @rspp: received service parameter page
1990 * @spp: response service parameter page
1992 static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len,
1993 const struct fc_els_spp *rspp,
1994 struct fc_els_spp *spp)
1996 if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR)
1997 return FC_SPP_RESP_INVL;
1998 return FC_SPP_RESP_ACK;
2002 * FC-4 provider ops for type 0 service parameters.
2004 * This handles the special case of type 0 which is always successful
2005 * but doesn't do anything otherwise.
2007 struct fc4_prov fc_rport_t0_prov = {
2008 .prli = fc_rport_t0_prli,
2012 * fc_setup_rport() - Initialize the rport_event_queue
2014 int fc_setup_rport(void)
2016 rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
2017 if (!rport_event_queue)
2023 * fc_destroy_rport() - Destroy the rport_event_queue
2025 void fc_destroy_rport(void)
2027 destroy_workqueue(rport_event_queue);
2031 * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port
2032 * @rport: The remote port whose I/O should be terminated
2034 void fc_rport_terminate_io(struct fc_rport *rport)
2036 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
2037 struct fc_lport *lport = rpriv->local_port;
2039 lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
2040 lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
2042 EXPORT_SYMBOL(fc_rport_terminate_io);