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
);