1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
4 *
5 * Maintained at www.Open-FCoE.org
6 */
7
8/*
9 * RPORT GENERAL INFO
10 *
11 * This file contains all processing regarding fc_rports. It contains the
12 * rport state machine and does all rport interaction with the transport class.
13 * There should be no other places in libfc that interact directly with the
14 * transport class in regards to adding and deleting rports.
15 *
16 * fc_rport's represent N_Port's within the fabric.
17 */
18
19/*
20 * RPORT LOCKING
21 *
22 * The rport should never hold the rport mutex and then attempt to acquire
23 * either the lport or disc mutexes. The rport's mutex is considered lesser
24 * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for
25 * more comments on the hierarchy.
26 *
27 * The locking strategy is similar to the lport's strategy. The lock protects
28 * the rport's states and is held and released by the entry points to the rport
29 * block. All _enter_* functions correspond to rport states and expect the rport
30 * mutex to be locked before calling them. This means that rports only handle
31 * one request or response at a time, since they're not critical for the I/O
32 * path this potential over-use of the mutex is acceptable.
33 */
34
35/*
36 * RPORT REFERENCE COUNTING
37 *
38 * A rport reference should be taken when:
39 * - an rport is allocated
40 * - a workqueue item is scheduled
41 * - an ELS request is send
42 * The reference should be dropped when:
43 * - the workqueue function has finished
44 * - the ELS response is handled
45 * - an rport is removed
46 */
47
48#include <linux/kernel.h>
49#include <linux/spinlock.h>
50#include <linux/interrupt.h>
51#include <linux/slab.h>
52#include <linux/rcupdate.h>
53#include <linux/timer.h>
54#include <linux/workqueue.h>
55#include <linux/export.h>
56#include <linux/rculist.h>
57
58#include <asm/unaligned.h>
59
60#include <scsi/libfc.h>
61
62#include "fc_encode.h"
63#include "fc_libfc.h"
64
65static struct workqueue_struct *rport_event_queue;
66
67static void fc_rport_enter_flogi(struct fc_rport_priv *);
68static void fc_rport_enter_plogi(struct fc_rport_priv *);
69static void fc_rport_enter_prli(struct fc_rport_priv *);
70static void fc_rport_enter_rtv(struct fc_rport_priv *);
71static void fc_rport_enter_ready(struct fc_rport_priv *);
72static void fc_rport_enter_logo(struct fc_rport_priv *);
73static void fc_rport_enter_adisc(struct fc_rport_priv *);
74
75static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
76static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
77static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
78static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *);
79static void fc_rport_timeout(struct work_struct *);
80static void fc_rport_error(struct fc_rport_priv *, int);
81static void fc_rport_error_retry(struct fc_rport_priv *, int);
82static void fc_rport_work(struct work_struct *);
83
84static const char *fc_rport_state_names[] = {
85 [RPORT_ST_INIT] = "Init",
86 [RPORT_ST_FLOGI] = "FLOGI",
87 [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT",
88 [RPORT_ST_PLOGI] = "PLOGI",
89 [RPORT_ST_PRLI] = "PRLI",
90 [RPORT_ST_RTV] = "RTV",
91 [RPORT_ST_READY] = "Ready",
92 [RPORT_ST_ADISC] = "ADISC",
93 [RPORT_ST_DELETE] = "Delete",
94};
95
96/**
97 * fc_rport_lookup() - Lookup a remote port by port_id
98 * @lport: The local port to lookup the remote port on
99 * @port_id: The remote port ID to look up
100 *
101 * The reference count of the fc_rport_priv structure is
102 * increased by one.
103 */
104struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
105 u32 port_id)
106{
107 struct fc_rport_priv *rdata = NULL, *tmp_rdata;
108
109 rcu_read_lock();
110 list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers)
111 if (tmp_rdata->ids.port_id == port_id &&
112 kref_get_unless_zero(kref: &tmp_rdata->kref)) {
113 rdata = tmp_rdata;
114 break;
115 }
116 rcu_read_unlock();
117 return rdata;
118}
119EXPORT_SYMBOL(fc_rport_lookup);
120
121/**
122 * fc_rport_create() - Create a new remote port
123 * @lport: The local port this remote port will be associated with
124 * @port_id: The identifiers for the new remote port
125 *
126 * The remote port will start in the INIT state.
127 */
128struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id)
129{
130 struct fc_rport_priv *rdata;
131 size_t rport_priv_size = sizeof(*rdata);
132
133 lockdep_assert_held(&lport->disc.disc_mutex);
134
135 rdata = fc_rport_lookup(lport, port_id);
136 if (rdata) {
137 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
138 return rdata;
139 }
140
141 if (lport->rport_priv_size > 0)
142 rport_priv_size = lport->rport_priv_size;
143 rdata = kzalloc(size: rport_priv_size, GFP_KERNEL);
144 if (!rdata)
145 return NULL;
146
147 rdata->ids.node_name = -1;
148 rdata->ids.port_name = -1;
149 rdata->ids.port_id = port_id;
150 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
151
152 kref_init(kref: &rdata->kref);
153 mutex_init(&rdata->rp_mutex);
154 rdata->local_port = lport;
155 rdata->rp_state = RPORT_ST_INIT;
156 rdata->event = RPORT_EV_NONE;
157 rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
158 rdata->e_d_tov = lport->e_d_tov;
159 rdata->r_a_tov = lport->r_a_tov;
160 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
161 INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
162 INIT_WORK(&rdata->event_work, fc_rport_work);
163 if (port_id != FC_FID_DIR_SERV) {
164 rdata->lld_event_callback = lport->tt.rport_event_callback;
165 list_add_rcu(new: &rdata->peers, head: &lport->disc.rports);
166 }
167 return rdata;
168}
169EXPORT_SYMBOL(fc_rport_create);
170
171/**
172 * fc_rport_destroy() - Free a remote port after last reference is released
173 * @kref: The remote port's kref
174 */
175void fc_rport_destroy(struct kref *kref)
176{
177 struct fc_rport_priv *rdata;
178
179 rdata = container_of(kref, struct fc_rport_priv, kref);
180 kfree_rcu(rdata, rcu);
181}
182EXPORT_SYMBOL(fc_rport_destroy);
183
184/**
185 * fc_rport_state() - Return a string identifying the remote port's state
186 * @rdata: The remote port
187 */
188static const char *fc_rport_state(struct fc_rport_priv *rdata)
189{
190 const char *cp;
191
192 cp = fc_rport_state_names[rdata->rp_state];
193 if (!cp)
194 cp = "Unknown";
195 return cp;
196}
197
198/**
199 * fc_set_rport_loss_tmo() - Set the remote port loss timeout
200 * @rport: The remote port that gets a new timeout value
201 * @timeout: The new timeout value (in seconds)
202 */
203void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
204{
205 if (timeout)
206 rport->dev_loss_tmo = timeout;
207 else
208 rport->dev_loss_tmo = 1;
209}
210EXPORT_SYMBOL(fc_set_rport_loss_tmo);
211
212/**
213 * fc_plogi_get_maxframe() - Get the maximum payload from the common service
214 * parameters in a FLOGI frame
215 * @flp: The FLOGI or PLOGI payload
216 * @maxval: The maximum frame size upper limit; this may be less than what
217 * is in the service parameters
218 */
219static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
220 unsigned int maxval)
221{
222 unsigned int mfs;
223
224 /*
225 * Get max payload from the common service parameters and the
226 * class 3 receive data field size.
227 */
228 mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
229 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
230 maxval = mfs;
231 mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
232 if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
233 maxval = mfs;
234 return maxval;
235}
236
237/**
238 * fc_rport_state_enter() - Change the state of a remote port
239 * @rdata: The remote port whose state should change
240 * @new: The new state
241 */
242static void fc_rport_state_enter(struct fc_rport_priv *rdata,
243 enum fc_rport_state new)
244{
245 lockdep_assert_held(&rdata->rp_mutex);
246
247 if (rdata->rp_state != new)
248 rdata->retries = 0;
249 rdata->rp_state = new;
250}
251
252/**
253 * fc_rport_work() - Handler for remote port events in the rport_event_queue
254 * @work: Handle to the remote port being dequeued
255 *
256 * Reference counting: drops kref on return
257 */
258static void fc_rport_work(struct work_struct *work)
259{
260 u32 port_id;
261 struct fc_rport_priv *rdata =
262 container_of(work, struct fc_rport_priv, event_work);
263 struct fc_rport_libfc_priv *rpriv;
264 enum fc_rport_event event;
265 struct fc_lport *lport = rdata->local_port;
266 struct fc_rport_operations *rport_ops;
267 struct fc_rport_identifiers ids;
268 struct fc_rport *rport;
269 struct fc4_prov *prov;
270 u8 type;
271
272 mutex_lock(&rdata->rp_mutex);
273 event = rdata->event;
274 rport_ops = rdata->ops;
275 rport = rdata->rport;
276
277 FC_RPORT_DBG(rdata, "work event %u\n", event);
278
279 switch (event) {
280 case RPORT_EV_READY:
281 ids = rdata->ids;
282 rdata->event = RPORT_EV_NONE;
283 rdata->major_retries = 0;
284 kref_get(kref: &rdata->kref);
285 mutex_unlock(lock: &rdata->rp_mutex);
286
287 if (!rport) {
288 FC_RPORT_DBG(rdata, "No rport!\n");
289 rport = fc_remote_port_add(shost: lport->host, channel: 0, ids: &ids);
290 }
291 if (!rport) {
292 FC_RPORT_DBG(rdata, "Failed to add the rport\n");
293 fc_rport_logoff(rdata);
294 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
295 return;
296 }
297 mutex_lock(&rdata->rp_mutex);
298 if (rdata->rport)
299 FC_RPORT_DBG(rdata, "rport already allocated\n");
300 rdata->rport = rport;
301 rport->maxframe_size = rdata->maxframe_size;
302 rport->supported_classes = rdata->supported_classes;
303
304 rpriv = rport->dd_data;
305 rpriv->local_port = lport;
306 rpriv->rp_state = rdata->rp_state;
307 rpriv->flags = rdata->flags;
308 rpriv->e_d_tov = rdata->e_d_tov;
309 rpriv->r_a_tov = rdata->r_a_tov;
310 mutex_unlock(lock: &rdata->rp_mutex);
311
312 if (rport_ops && rport_ops->event_callback) {
313 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
314 rport_ops->event_callback(lport, rdata, event);
315 }
316 if (rdata->lld_event_callback) {
317 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
318 rdata->lld_event_callback(lport, rdata, event);
319 }
320 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
321 break;
322
323 case RPORT_EV_FAILED:
324 case RPORT_EV_LOGO:
325 case RPORT_EV_STOP:
326 if (rdata->prli_count) {
327 mutex_lock(&fc_prov_mutex);
328 for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
329 prov = fc_passive_prov[type];
330 if (prov && prov->prlo)
331 prov->prlo(rdata);
332 }
333 mutex_unlock(lock: &fc_prov_mutex);
334 }
335 port_id = rdata->ids.port_id;
336 mutex_unlock(lock: &rdata->rp_mutex);
337
338 if (rport_ops && rport_ops->event_callback) {
339 FC_RPORT_DBG(rdata, "callback ev %d\n", event);
340 rport_ops->event_callback(lport, rdata, event);
341 }
342 if (rdata->lld_event_callback) {
343 FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
344 rdata->lld_event_callback(lport, rdata, event);
345 }
346 if (cancel_delayed_work_sync(dwork: &rdata->retry_work))
347 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
348
349 /*
350 * Reset any outstanding exchanges before freeing rport.
351 */
352 lport->tt.exch_mgr_reset(lport, 0, port_id);
353 lport->tt.exch_mgr_reset(lport, port_id, 0);
354
355 if (rport) {
356 rpriv = rport->dd_data;
357 rpriv->rp_state = RPORT_ST_DELETE;
358 mutex_lock(&rdata->rp_mutex);
359 rdata->rport = NULL;
360 mutex_unlock(lock: &rdata->rp_mutex);
361 fc_remote_port_delete(rport);
362 }
363
364 mutex_lock(&rdata->rp_mutex);
365 if (rdata->rp_state == RPORT_ST_DELETE) {
366 if (port_id == FC_FID_DIR_SERV) {
367 rdata->event = RPORT_EV_NONE;
368 mutex_unlock(lock: &rdata->rp_mutex);
369 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
370 } else if ((rdata->flags & FC_RP_STARTED) &&
371 rdata->major_retries <
372 lport->max_rport_retry_count) {
373 rdata->major_retries++;
374 rdata->event = RPORT_EV_NONE;
375 FC_RPORT_DBG(rdata, "work restart\n");
376 fc_rport_enter_flogi(rdata);
377 mutex_unlock(lock: &rdata->rp_mutex);
378 } else {
379 mutex_unlock(lock: &rdata->rp_mutex);
380 FC_RPORT_DBG(rdata, "work delete\n");
381 mutex_lock(&lport->disc.disc_mutex);
382 list_del_rcu(entry: &rdata->peers);
383 mutex_unlock(lock: &lport->disc.disc_mutex);
384 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
385 }
386 } else {
387 /*
388 * Re-open for events. Reissue READY event if ready.
389 */
390 rdata->event = RPORT_EV_NONE;
391 if (rdata->rp_state == RPORT_ST_READY) {
392 FC_RPORT_DBG(rdata, "work reopen\n");
393 fc_rport_enter_ready(rdata);
394 }
395 mutex_unlock(lock: &rdata->rp_mutex);
396 }
397 break;
398
399 default:
400 mutex_unlock(lock: &rdata->rp_mutex);
401 break;
402 }
403 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
404}
405
406/**
407 * fc_rport_login() - Start the remote port login state machine
408 * @rdata: The remote port to be logged in to
409 *
410 * Initiates the RP state machine. It is called from the LP module.
411 * This function will issue the following commands to the N_Port
412 * identified by the FC ID provided.
413 *
414 * - PLOGI
415 * - PRLI
416 * - RTV
417 *
418 * Locking Note: Called without the rport lock held. This
419 * function will hold the rport lock, call an _enter_*
420 * function and then unlock the rport.
421 *
422 * This indicates the intent to be logged into the remote port.
423 * If it appears we are already logged in, ADISC is used to verify
424 * the setup.
425 */
426int fc_rport_login(struct fc_rport_priv *rdata)
427{
428 mutex_lock(&rdata->rp_mutex);
429
430 if (rdata->flags & FC_RP_STARTED) {
431 FC_RPORT_DBG(rdata, "port already started\n");
432 mutex_unlock(lock: &rdata->rp_mutex);
433 return 0;
434 }
435
436 rdata->flags |= FC_RP_STARTED;
437 switch (rdata->rp_state) {
438 case RPORT_ST_READY:
439 FC_RPORT_DBG(rdata, "ADISC port\n");
440 fc_rport_enter_adisc(rdata);
441 break;
442 case RPORT_ST_DELETE:
443 FC_RPORT_DBG(rdata, "Restart deleted port\n");
444 break;
445 case RPORT_ST_INIT:
446 FC_RPORT_DBG(rdata, "Login to port\n");
447 fc_rport_enter_flogi(rdata);
448 break;
449 default:
450 FC_RPORT_DBG(rdata, "Login in progress, state %s\n",
451 fc_rport_state(rdata));
452 break;
453 }
454 mutex_unlock(lock: &rdata->rp_mutex);
455
456 return 0;
457}
458EXPORT_SYMBOL(fc_rport_login);
459
460/**
461 * fc_rport_enter_delete() - Schedule a remote port to be deleted
462 * @rdata: The remote port to be deleted
463 * @event: The event to report as the reason for deletion
464 *
465 * Allow state change into DELETE only once.
466 *
467 * Call queue_work only if there's no event already pending.
468 * Set the new event so that the old pending event will not occur.
469 * Since we have the mutex, even if fc_rport_work() is already started,
470 * it'll see the new event.
471 *
472 * Reference counting: does not modify kref
473 */
474static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
475 enum fc_rport_event event)
476{
477 lockdep_assert_held(&rdata->rp_mutex);
478
479 if (rdata->rp_state == RPORT_ST_DELETE)
480 return;
481
482 FC_RPORT_DBG(rdata, "Delete port\n");
483
484 fc_rport_state_enter(rdata, new: RPORT_ST_DELETE);
485
486 if (rdata->event == RPORT_EV_NONE) {
487 kref_get(kref: &rdata->kref);
488 if (!queue_work(wq: rport_event_queue, work: &rdata->event_work))
489 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
490 }
491
492 rdata->event = event;
493}
494
495/**
496 * fc_rport_logoff() - Logoff and remove a remote port
497 * @rdata: The remote port to be logged off of
498 *
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.
502 */
503int fc_rport_logoff(struct fc_rport_priv *rdata)
504{
505 struct fc_lport *lport = rdata->local_port;
506 u32 port_id = rdata->ids.port_id;
507
508 mutex_lock(&rdata->rp_mutex);
509
510 FC_RPORT_DBG(rdata, "Remove port\n");
511
512 rdata->flags &= ~FC_RP_STARTED;
513 if (rdata->rp_state == RPORT_ST_DELETE) {
514 FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
515 goto out;
516 }
517 /*
518 * FC-LS states:
519 * To explicitly Logout, the initiating Nx_Port shall terminate
520 * other open Sequences that it initiated with the destination
521 * Nx_Port prior to performing Logout.
522 */
523 lport->tt.exch_mgr_reset(lport, 0, port_id);
524 lport->tt.exch_mgr_reset(lport, port_id, 0);
525
526 fc_rport_enter_logo(rdata);
527
528 /*
529 * Change the state to Delete so that we discard
530 * the response.
531 */
532 fc_rport_enter_delete(rdata, event: RPORT_EV_STOP);
533out:
534 mutex_unlock(lock: &rdata->rp_mutex);
535 return 0;
536}
537EXPORT_SYMBOL(fc_rport_logoff);
538
539/**
540 * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
541 * @rdata: The remote port that is ready
542 *
543 * Reference counting: schedules workqueue, does not modify kref
544 */
545static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
546{
547 lockdep_assert_held(&rdata->rp_mutex);
548
549 fc_rport_state_enter(rdata, new: RPORT_ST_READY);
550
551 FC_RPORT_DBG(rdata, "Port is Ready\n");
552
553 kref_get(kref: &rdata->kref);
554 if (rdata->event == RPORT_EV_NONE &&
555 !queue_work(wq: rport_event_queue, work: &rdata->event_work))
556 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
557
558 rdata->event = RPORT_EV_READY;
559}
560
561/**
562 * fc_rport_timeout() - Handler for the retry_work timer
563 * @work: Handle to the remote port that has timed out
564 *
565 * Locking Note: Called without the rport lock held. This
566 * function will hold the rport lock, call an _enter_*
567 * function and then unlock the rport.
568 *
569 * Reference counting: Drops kref on return.
570 */
571static void fc_rport_timeout(struct work_struct *work)
572{
573 struct fc_rport_priv *rdata =
574 container_of(work, struct fc_rport_priv, retry_work.work);
575
576 mutex_lock(&rdata->rp_mutex);
577 FC_RPORT_DBG(rdata, "Port timeout, state %s\n", fc_rport_state(rdata));
578
579 switch (rdata->rp_state) {
580 case RPORT_ST_FLOGI:
581 fc_rport_enter_flogi(rdata);
582 break;
583 case RPORT_ST_PLOGI:
584 fc_rport_enter_plogi(rdata);
585 break;
586 case RPORT_ST_PRLI:
587 fc_rport_enter_prli(rdata);
588 break;
589 case RPORT_ST_RTV:
590 fc_rport_enter_rtv(rdata);
591 break;
592 case RPORT_ST_ADISC:
593 fc_rport_enter_adisc(rdata);
594 break;
595 case RPORT_ST_PLOGI_WAIT:
596 case RPORT_ST_READY:
597 case RPORT_ST_INIT:
598 case RPORT_ST_DELETE:
599 break;
600 }
601
602 mutex_unlock(lock: &rdata->rp_mutex);
603 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
604}
605
606/**
607 * fc_rport_error() - Error handler, called once retries have been exhausted
608 * @rdata: The remote port the error is happened on
609 * @err: The error code
610 *
611 * Reference counting: does not modify kref
612 */
613static void fc_rport_error(struct fc_rport_priv *rdata, int err)
614{
615 struct fc_lport *lport = rdata->local_port;
616
617 lockdep_assert_held(&rdata->rp_mutex);
618
619 FC_RPORT_DBG(rdata, "Error %d in state %s, retries %d\n",
620 -err, fc_rport_state(rdata), rdata->retries);
621
622 switch (rdata->rp_state) {
623 case RPORT_ST_FLOGI:
624 rdata->flags &= ~FC_RP_STARTED;
625 fc_rport_enter_delete(rdata, event: RPORT_EV_FAILED);
626 break;
627 case RPORT_ST_PLOGI:
628 if (lport->point_to_multipoint) {
629 rdata->flags &= ~FC_RP_STARTED;
630 fc_rport_enter_delete(rdata, event: RPORT_EV_FAILED);
631 } else
632 fc_rport_enter_logo(rdata);
633 break;
634 case RPORT_ST_RTV:
635 fc_rport_enter_ready(rdata);
636 break;
637 case RPORT_ST_PRLI:
638 fc_rport_enter_plogi(rdata);
639 break;
640 case RPORT_ST_ADISC:
641 fc_rport_enter_logo(rdata);
642 break;
643 case RPORT_ST_PLOGI_WAIT:
644 case RPORT_ST_DELETE:
645 case RPORT_ST_READY:
646 case RPORT_ST_INIT:
647 break;
648 }
649}
650
651/**
652 * fc_rport_error_retry() - Handler for remote port state retries
653 * @rdata: The remote port whose state is to be retried
654 * @err: The error code
655 *
656 * If the error was an exchange timeout retry immediately,
657 * otherwise wait for E_D_TOV.
658 *
659 * Reference counting: increments kref when scheduling retry_work
660 */
661static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err)
662{
663 unsigned long delay = msecs_to_jiffies(m: rdata->e_d_tov);
664
665 lockdep_assert_held(&rdata->rp_mutex);
666
667 /* make sure this isn't an FC_EX_CLOSED error, never retry those */
668 if (err == -FC_EX_CLOSED)
669 goto out;
670
671 if (rdata->retries < rdata->local_port->max_rport_retry_count) {
672 FC_RPORT_DBG(rdata, "Error %d in state %s, retrying\n",
673 err, fc_rport_state(rdata));
674 rdata->retries++;
675 /* no additional delay on exchange timeouts */
676 if (err == -FC_EX_TIMEOUT)
677 delay = 0;
678 kref_get(kref: &rdata->kref);
679 if (!schedule_delayed_work(dwork: &rdata->retry_work, delay))
680 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
681 return;
682 }
683
684out:
685 fc_rport_error(rdata, err);
686}
687
688/**
689 * fc_rport_login_complete() - Handle parameters and completion of p-mp login.
690 * @rdata: The remote port which we logged into or which logged into us.
691 * @fp: The FLOGI or PLOGI request or response frame
692 *
693 * Returns non-zero error if a problem is detected with the frame.
694 * Does not free the frame.
695 *
696 * This is only used in point-to-multipoint mode for FIP currently.
697 */
698static int fc_rport_login_complete(struct fc_rport_priv *rdata,
699 struct fc_frame *fp)
700{
701 struct fc_lport *lport = rdata->local_port;
702 struct fc_els_flogi *flogi;
703 unsigned int e_d_tov;
704 u16 csp_flags;
705
706 flogi = fc_frame_payload_get(fp, len: sizeof(*flogi));
707 if (!flogi)
708 return -EINVAL;
709
710 csp_flags = ntohs(flogi->fl_csp.sp_features);
711
712 if (fc_frame_payload_op(fp) == ELS_FLOGI) {
713 if (csp_flags & FC_SP_FT_FPORT) {
714 FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n");
715 return -EINVAL;
716 }
717 } else {
718
719 /*
720 * E_D_TOV is not valid on an incoming FLOGI request.
721 */
722 e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov);
723 if (csp_flags & FC_SP_FT_EDTR)
724 e_d_tov /= 1000000;
725 if (e_d_tov > rdata->e_d_tov)
726 rdata->e_d_tov = e_d_tov;
727 }
728 rdata->maxframe_size = fc_plogi_get_maxframe(flp: flogi, maxval: lport->mfs);
729 return 0;
730}
731
732/**
733 * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode
734 * @sp: The sequence that the FLOGI was on
735 * @fp: The FLOGI response frame
736 * @rp_arg: The remote port that received the FLOGI response
737 */
738static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
739 void *rp_arg)
740{
741 struct fc_rport_priv *rdata = rp_arg;
742 struct fc_lport *lport = rdata->local_port;
743 struct fc_els_flogi *flogi;
744 unsigned int r_a_tov;
745 u8 opcode;
746 int err = 0;
747
748 FC_RPORT_DBG(rdata, "Received a FLOGI %s\n",
749 IS_ERR(fp) ? "error" : fc_els_resp_type(fp));
750
751 if (fp == ERR_PTR(error: -FC_EX_CLOSED))
752 goto put;
753
754 mutex_lock(&rdata->rp_mutex);
755
756 if (rdata->rp_state != RPORT_ST_FLOGI) {
757 FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state "
758 "%s\n", fc_rport_state(rdata));
759 if (IS_ERR(ptr: fp))
760 goto err;
761 goto out;
762 }
763
764 if (IS_ERR(ptr: fp)) {
765 fc_rport_error(rdata, err: PTR_ERR(ptr: fp));
766 goto err;
767 }
768 opcode = fc_frame_payload_op(fp);
769 if (opcode == ELS_LS_RJT) {
770 struct fc_els_ls_rjt *rjt;
771
772 rjt = fc_frame_payload_get(fp, len: sizeof(*rjt));
773 FC_RPORT_DBG(rdata, "FLOGI ELS rejected, reason %x expl %x\n",
774 rjt->er_reason, rjt->er_explan);
775 err = -FC_EX_ELS_RJT;
776 goto bad;
777 } else if (opcode != ELS_LS_ACC) {
778 FC_RPORT_DBG(rdata, "FLOGI ELS invalid opcode %x\n", opcode);
779 err = -FC_EX_ELS_RJT;
780 goto bad;
781 }
782 if (fc_rport_login_complete(rdata, fp)) {
783 FC_RPORT_DBG(rdata, "FLOGI failed, no login\n");
784 err = -FC_EX_INV_LOGIN;
785 goto bad;
786 }
787
788 flogi = fc_frame_payload_get(fp, len: sizeof(*flogi));
789 if (!flogi) {
790 err = -FC_EX_ALLOC_ERR;
791 goto bad;
792 }
793 r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
794 if (r_a_tov > rdata->r_a_tov)
795 rdata->r_a_tov = r_a_tov;
796
797 if (rdata->ids.port_name < lport->wwpn)
798 fc_rport_enter_plogi(rdata);
799 else
800 fc_rport_state_enter(rdata, new: RPORT_ST_PLOGI_WAIT);
801out:
802 fc_frame_free(fp);
803err:
804 mutex_unlock(lock: &rdata->rp_mutex);
805put:
806 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
807 return;
808bad:
809 FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
810 fc_rport_error_retry(rdata, err);
811 goto out;
812}
813
814/**
815 * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp
816 * @rdata: The remote port to send a FLOGI to
817 *
818 * Reference counting: increments kref when sending ELS
819 */
820static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
821{
822 struct fc_lport *lport = rdata->local_port;
823 struct fc_frame *fp;
824
825 lockdep_assert_held(&rdata->rp_mutex);
826
827 if (!lport->point_to_multipoint)
828 return fc_rport_enter_plogi(rdata);
829
830 FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n",
831 fc_rport_state(rdata));
832
833 fc_rport_state_enter(rdata, new: RPORT_ST_FLOGI);
834
835 fp = fc_frame_alloc(dev: lport, len: sizeof(struct fc_els_flogi));
836 if (!fp)
837 return fc_rport_error_retry(rdata, err: -FC_EX_ALLOC_ERR);
838
839 kref_get(kref: &rdata->kref);
840 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI,
841 fc_rport_flogi_resp, rdata,
842 2 * lport->r_a_tov)) {
843 fc_rport_error_retry(rdata, err: -FC_EX_XMIT_ERR);
844 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
845 }
846}
847
848/**
849 * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode
850 * @lport: The local port that received the PLOGI request
851 * @rx_fp: The PLOGI request frame
852 *
853 * Reference counting: drops kref on return
854 */
855static void fc_rport_recv_flogi_req(struct fc_lport *lport,
856 struct fc_frame *rx_fp)
857{
858 struct fc_els_flogi *flp;
859 struct fc_rport_priv *rdata;
860 struct fc_frame *fp = rx_fp;
861 struct fc_seq_els_data rjt_data;
862 u32 sid;
863
864 sid = fc_frame_sid(fp);
865
866 FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
867
868 if (!lport->point_to_multipoint) {
869 rjt_data.reason = ELS_RJT_UNSUP;
870 rjt_data.explan = ELS_EXPL_NONE;
871 goto reject;
872 }
873
874 flp = fc_frame_payload_get(fp, len: sizeof(*flp));
875 if (!flp) {
876 rjt_data.reason = ELS_RJT_LOGIC;
877 rjt_data.explan = ELS_EXPL_INV_LEN;
878 goto reject;
879 }
880
881 rdata = fc_rport_lookup(lport, sid);
882 if (!rdata) {
883 rjt_data.reason = ELS_RJT_FIP;
884 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
885 goto reject;
886 }
887 mutex_lock(&rdata->rp_mutex);
888
889 FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
890 fc_rport_state(rdata));
891
892 switch (rdata->rp_state) {
893 case RPORT_ST_INIT:
894 /*
895 * If received the FLOGI request on RPORT which is INIT state
896 * (means not transition to FLOGI either fc_rport timeout
897 * function didn;t trigger or this end hasn;t received
898 * beacon yet from other end. In that case only, allow RPORT
899 * state machine to continue, otherwise fall through which
900 * causes the code to send reject response.
901 * NOTE; Not checking for FIP->state such as VNMP_UP or
902 * VNMP_CLAIM because if FIP state is not one of those,
903 * RPORT wouldn;t have created and 'rport_lookup' would have
904 * failed anyway in that case.
905 */
906 break;
907 case RPORT_ST_DELETE:
908 mutex_unlock(lock: &rdata->rp_mutex);
909 rjt_data.reason = ELS_RJT_FIP;
910 rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
911 goto reject_put;
912 case RPORT_ST_FLOGI:
913 case RPORT_ST_PLOGI_WAIT:
914 case RPORT_ST_PLOGI:
915 break;
916 case RPORT_ST_PRLI:
917 case RPORT_ST_RTV:
918 case RPORT_ST_READY:
919 case RPORT_ST_ADISC:
920 /*
921 * Set the remote port to be deleted and to then restart.
922 * This queues work to be sure exchanges are reset.
923 */
924 fc_rport_enter_delete(rdata, event: RPORT_EV_LOGO);
925 mutex_unlock(lock: &rdata->rp_mutex);
926 rjt_data.reason = ELS_RJT_BUSY;
927 rjt_data.explan = ELS_EXPL_NONE;
928 goto reject_put;
929 }
930 if (fc_rport_login_complete(rdata, fp)) {
931 mutex_unlock(lock: &rdata->rp_mutex);
932 rjt_data.reason = ELS_RJT_LOGIC;
933 rjt_data.explan = ELS_EXPL_NONE;
934 goto reject_put;
935 }
936
937 fp = fc_frame_alloc(dev: lport, len: sizeof(*flp));
938 if (!fp)
939 goto out;
940
941 fc_flogi_fill(lport, fp);
942 flp = fc_frame_payload_get(fp, len: sizeof(*flp));
943 flp->fl_cmd = ELS_LS_ACC;
944
945 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, parm_offset: 0);
946 lport->tt.frame_send(lport, fp);
947
948 /*
949 * Do not proceed with the state machine if our
950 * FLOGI has crossed with an FLOGI from the
951 * remote port; wait for the FLOGI response instead.
952 */
953 if (rdata->rp_state != RPORT_ST_FLOGI) {
954 if (rdata->ids.port_name < lport->wwpn)
955 fc_rport_enter_plogi(rdata);
956 else
957 fc_rport_state_enter(rdata, new: RPORT_ST_PLOGI_WAIT);
958 }
959out:
960 mutex_unlock(lock: &rdata->rp_mutex);
961 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
962 fc_frame_free(fp: rx_fp);
963 return;
964
965reject_put:
966 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
967reject:
968 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
969 fc_frame_free(fp: rx_fp);
970}
971
972/**
973 * fc_rport_plogi_resp() - Handler for ELS PLOGI responses
974 * @sp: The sequence the PLOGI is on
975 * @fp: The PLOGI response frame
976 * @rdata_arg: The remote port that sent the PLOGI response
977 *
978 * Locking Note: This function will be called without the rport lock
979 * held, but it will lock, call an _enter_* function or fc_rport_error
980 * and then unlock the rport.
981 */
982static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
983 void *rdata_arg)
984{
985 struct fc_rport_priv *rdata = rdata_arg;
986 struct fc_lport *lport = rdata->local_port;
987 struct fc_els_flogi *plp = NULL;
988 u16 csp_seq;
989 u16 cssp_seq;
990 u8 op;
991
992 FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
993
994 if (fp == ERR_PTR(error: -FC_EX_CLOSED))
995 goto put;
996
997 mutex_lock(&rdata->rp_mutex);
998
999 if (rdata->rp_state != RPORT_ST_PLOGI) {
1000 FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
1001 "%s\n", fc_rport_state(rdata));
1002 if (IS_ERR(ptr: fp))
1003 goto err;
1004 goto out;
1005 }
1006
1007 if (IS_ERR(ptr: fp)) {
1008 fc_rport_error_retry(rdata, err: PTR_ERR(ptr: fp));
1009 goto err;
1010 }
1011
1012 op = fc_frame_payload_op(fp);
1013 if (op == ELS_LS_ACC &&
1014 (plp = fc_frame_payload_get(fp, len: sizeof(*plp))) != NULL) {
1015 rdata->ids.port_name = get_unaligned_be64(p: &plp->fl_wwpn);
1016 rdata->ids.node_name = get_unaligned_be64(p: &plp->fl_wwnn);
1017
1018 /* save plogi response sp_features for further reference */
1019 rdata->sp_features = ntohs(plp->fl_csp.sp_features);
1020
1021 if (lport->point_to_multipoint)
1022 fc_rport_login_complete(rdata, fp);
1023 csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
1024 cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
1025 if (cssp_seq < csp_seq)
1026 csp_seq = cssp_seq;
1027 rdata->max_seq = csp_seq;
1028 rdata->maxframe_size = fc_plogi_get_maxframe(flp: plp, maxval: lport->mfs);
1029 fc_rport_enter_prli(rdata);
1030 } else {
1031 struct fc_els_ls_rjt *rjt;
1032
1033 rjt = fc_frame_payload_get(fp, len: sizeof(*rjt));
1034 if (!rjt)
1035 FC_RPORT_DBG(rdata, "PLOGI bad response\n");
1036 else
1037 FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n",
1038 rjt->er_reason, rjt->er_explan);
1039 fc_rport_error_retry(rdata, err: -FC_EX_ELS_RJT);
1040 }
1041out:
1042 fc_frame_free(fp);
1043err:
1044 mutex_unlock(lock: &rdata->rp_mutex);
1045put:
1046 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1047}
1048
1049static bool
1050fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata)
1051{
1052 if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN)
1053 return true;
1054 if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) &&
1055 (lport->service_params & FCP_SPPF_INIT_FCN))
1056 return true;
1057 if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) &&
1058 (lport->service_params & FCP_SPPF_TARG_FCN))
1059 return true;
1060 return false;
1061}
1062
1063/**
1064 * fc_rport_enter_plogi() - Send Port Login (PLOGI) request
1065 * @rdata: The remote port to send a PLOGI to
1066 *
1067 * Reference counting: increments kref when sending ELS
1068 */
1069static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
1070{
1071 struct fc_lport *lport = rdata->local_port;
1072 struct fc_frame *fp;
1073
1074 lockdep_assert_held(&rdata->rp_mutex);
1075
1076 if (!fc_rport_compatible_roles(lport, rdata)) {
1077 FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n");
1078 fc_rport_state_enter(rdata, new: RPORT_ST_PLOGI_WAIT);
1079 return;
1080 }
1081
1082 FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
1083 fc_rport_state(rdata));
1084
1085 fc_rport_state_enter(rdata, new: RPORT_ST_PLOGI);
1086
1087 rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
1088 fp = fc_frame_alloc(dev: lport, len: sizeof(struct fc_els_flogi));
1089 if (!fp) {
1090 FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__);
1091 fc_rport_error_retry(rdata, err: -FC_EX_ALLOC_ERR);
1092 return;
1093 }
1094 rdata->e_d_tov = lport->e_d_tov;
1095
1096 kref_get(kref: &rdata->kref);
1097 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
1098 fc_rport_plogi_resp, rdata,
1099 2 * lport->r_a_tov)) {
1100 fc_rport_error_retry(rdata, err: -FC_EX_XMIT_ERR);
1101 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1102 }
1103}
1104
1105/**
1106 * fc_rport_prli_resp() - Process Login (PRLI) response handler
1107 * @sp: The sequence the PRLI response was on
1108 * @fp: The PRLI response frame
1109 * @rdata_arg: The remote port that sent the PRLI response
1110 *
1111 * Locking Note: This function will be called without the rport lock
1112 * held, but it will lock, call an _enter_* function or fc_rport_error
1113 * and then unlock the rport.
1114 */
1115static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
1116 void *rdata_arg)
1117{
1118 struct fc_rport_priv *rdata = rdata_arg;
1119 struct {
1120 struct fc_els_prli prli;
1121 struct fc_els_spp spp;
1122 } *pp;
1123 struct fc_els_spp temp_spp;
1124 struct fc_els_ls_rjt *rjt;
1125 struct fc4_prov *prov;
1126 u32 roles = FC_RPORT_ROLE_UNKNOWN;
1127 u32 fcp_parm = 0;
1128 u8 op;
1129 enum fc_els_spp_resp resp_code;
1130
1131 FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
1132
1133 if (fp == ERR_PTR(error: -FC_EX_CLOSED))
1134 goto put;
1135
1136 mutex_lock(&rdata->rp_mutex);
1137
1138 if (rdata->rp_state != RPORT_ST_PRLI) {
1139 FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
1140 "%s\n", fc_rport_state(rdata));
1141 if (IS_ERR(ptr: fp))
1142 goto err;
1143 goto out;
1144 }
1145
1146 if (IS_ERR(ptr: fp)) {
1147 fc_rport_error_retry(rdata, err: PTR_ERR(ptr: fp));
1148 goto err;
1149 }
1150
1151 /* reinitialize remote port roles */
1152 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
1153
1154 op = fc_frame_payload_op(fp);
1155 if (op == ELS_LS_ACC) {
1156 pp = fc_frame_payload_get(fp, len: sizeof(*pp));
1157 if (!pp) {
1158 fc_rport_error_retry(rdata, err: -FC_EX_SEQ_ERR);
1159 goto out;
1160 }
1161
1162 resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
1163 FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n",
1164 pp->spp.spp_flags, pp->spp.spp_type);
1165
1166 rdata->spp_type = pp->spp.spp_type;
1167 if (resp_code != FC_SPP_RESP_ACK) {
1168 if (resp_code == FC_SPP_RESP_CONF)
1169 fc_rport_error(rdata, err: -FC_EX_SEQ_ERR);
1170 else
1171 fc_rport_error_retry(rdata, err: -FC_EX_SEQ_ERR);
1172 goto out;
1173 }
1174 if (pp->prli.prli_spp_len < sizeof(pp->spp)) {
1175 fc_rport_error_retry(rdata, err: -FC_EX_SEQ_ERR);
1176 goto out;
1177 }
1178
1179 fcp_parm = ntohl(pp->spp.spp_params);
1180 if (fcp_parm & FCP_SPPF_RETRY)
1181 rdata->flags |= FC_RP_FLAGS_RETRY;
1182 if (fcp_parm & FCP_SPPF_CONF_COMPL)
1183 rdata->flags |= FC_RP_FLAGS_CONF_REQ;
1184
1185 /*
1186 * Call prli provider if we should act as a target
1187 */
1188 if (rdata->spp_type < FC_FC4_PROV_SIZE) {
1189 prov = fc_passive_prov[rdata->spp_type];
1190 if (prov) {
1191 memset(&temp_spp, 0, sizeof(temp_spp));
1192 prov->prli(rdata, pp->prli.prli_spp_len,
1193 &pp->spp, &temp_spp);
1194 }
1195 }
1196 /*
1197 * Check if the image pair could be established
1198 */
1199 if (rdata->spp_type != FC_TYPE_FCP ||
1200 !(pp->spp.spp_flags & FC_SPP_EST_IMG_PAIR)) {
1201 /*
1202 * Nope; we can't use this port as a target.
1203 */
1204 fcp_parm &= ~FCP_SPPF_TARG_FCN;
1205 }
1206 rdata->supported_classes = FC_COS_CLASS3;
1207 if (fcp_parm & FCP_SPPF_INIT_FCN)
1208 roles |= FC_RPORT_ROLE_FCP_INITIATOR;
1209 if (fcp_parm & FCP_SPPF_TARG_FCN)
1210 roles |= FC_RPORT_ROLE_FCP_TARGET;
1211
1212 rdata->ids.roles = roles;
1213 fc_rport_enter_rtv(rdata);
1214
1215 } else {
1216 rjt = fc_frame_payload_get(fp, len: sizeof(*rjt));
1217 if (!rjt)
1218 FC_RPORT_DBG(rdata, "PRLI bad response\n");
1219 else {
1220 FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n",
1221 rjt->er_reason, rjt->er_explan);
1222 if (rjt->er_reason == ELS_RJT_UNAB &&
1223 rjt->er_explan == ELS_EXPL_PLOGI_REQD) {
1224 fc_rport_enter_plogi(rdata);
1225 goto out;
1226 }
1227 }
1228 fc_rport_error_retry(rdata, FC_EX_ELS_RJT);
1229 }
1230
1231out:
1232 fc_frame_free(fp);
1233err:
1234 mutex_unlock(lock: &rdata->rp_mutex);
1235put:
1236 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1237}
1238
1239/**
1240 * fc_rport_enter_prli() - Send Process Login (PRLI) request
1241 * @rdata: The remote port to send the PRLI request to
1242 *
1243 * Reference counting: increments kref when sending ELS
1244 */
1245static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
1246{
1247 struct fc_lport *lport = rdata->local_port;
1248 struct {
1249 struct fc_els_prli prli;
1250 struct fc_els_spp spp;
1251 } *pp;
1252 struct fc_frame *fp;
1253 struct fc4_prov *prov;
1254
1255 lockdep_assert_held(&rdata->rp_mutex);
1256
1257 /*
1258 * If the rport is one of the well known addresses
1259 * we skip PRLI and RTV and go straight to READY.
1260 */
1261 if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
1262 fc_rport_enter_ready(rdata);
1263 return;
1264 }
1265
1266 /*
1267 * And if the local port does not support the initiator function
1268 * there's no need to send a PRLI, either.
1269 */
1270 if (!(lport->service_params & FCP_SPPF_INIT_FCN)) {
1271 fc_rport_enter_ready(rdata);
1272 return;
1273 }
1274
1275 FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
1276 fc_rport_state(rdata));
1277
1278 fc_rport_state_enter(rdata, new: RPORT_ST_PRLI);
1279
1280 fp = fc_frame_alloc(dev: lport, len: sizeof(*pp));
1281 if (!fp) {
1282 fc_rport_error_retry(rdata, err: -FC_EX_ALLOC_ERR);
1283 return;
1284 }
1285
1286 fc_prli_fill(lport, fp);
1287
1288 prov = fc_passive_prov[FC_TYPE_FCP];
1289 if (prov) {
1290 pp = fc_frame_payload_get(fp, len: sizeof(*pp));
1291 prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
1292 }
1293
1294 fc_fill_fc_hdr(fp, r_ctl: FC_RCTL_ELS_REQ, did: rdata->ids.port_id,
1295 fc_host_port_id(lport->host), type: FC_TYPE_ELS,
1296 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, parm_offset: 0);
1297
1298 kref_get(kref: &rdata->kref);
1299 if (!fc_exch_seq_send(lport, fp, resp: fc_rport_prli_resp,
1300 NULL, arg: rdata, timer_msec: 2 * lport->r_a_tov)) {
1301 fc_rport_error_retry(rdata, err: -FC_EX_XMIT_ERR);
1302 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1303 }
1304}
1305
1306/**
1307 * fc_rport_rtv_resp() - Handler for Request Timeout Value (RTV) responses
1308 * @sp: The sequence the RTV was on
1309 * @fp: The RTV response frame
1310 * @rdata_arg: The remote port that sent the RTV response
1311 *
1312 * Many targets don't seem to support this.
1313 *
1314 * Locking Note: This function will be called without the rport lock
1315 * held, but it will lock, call an _enter_* function or fc_rport_error
1316 * and then unlock the rport.
1317 */
1318static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
1319 void *rdata_arg)
1320{
1321 struct fc_rport_priv *rdata = rdata_arg;
1322 u8 op;
1323
1324 FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
1325
1326 if (fp == ERR_PTR(error: -FC_EX_CLOSED))
1327 goto put;
1328
1329 mutex_lock(&rdata->rp_mutex);
1330
1331 if (rdata->rp_state != RPORT_ST_RTV) {
1332 FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
1333 "%s\n", fc_rport_state(rdata));
1334 if (IS_ERR(ptr: fp))
1335 goto err;
1336 goto out;
1337 }
1338
1339 if (IS_ERR(ptr: fp)) {
1340 fc_rport_error(rdata, err: PTR_ERR(ptr: fp));
1341 goto err;
1342 }
1343
1344 op = fc_frame_payload_op(fp);
1345 if (op == ELS_LS_ACC) {
1346 struct fc_els_rtv_acc *rtv;
1347 u32 toq;
1348 u32 tov;
1349
1350 rtv = fc_frame_payload_get(fp, len: sizeof(*rtv));
1351 if (rtv) {
1352 toq = ntohl(rtv->rtv_toq);
1353 tov = ntohl(rtv->rtv_r_a_tov);
1354 if (tov == 0)
1355 tov = 1;
1356 if (tov > rdata->r_a_tov)
1357 rdata->r_a_tov = tov;
1358 tov = ntohl(rtv->rtv_e_d_tov);
1359 if (toq & FC_ELS_RTV_EDRES)
1360 tov /= 1000000;
1361 if (tov == 0)
1362 tov = 1;
1363 if (tov > rdata->e_d_tov)
1364 rdata->e_d_tov = tov;
1365 }
1366 }
1367
1368 fc_rport_enter_ready(rdata);
1369
1370out:
1371 fc_frame_free(fp);
1372err:
1373 mutex_unlock(lock: &rdata->rp_mutex);
1374put:
1375 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1376}
1377
1378/**
1379 * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request
1380 * @rdata: The remote port to send the RTV request to
1381 *
1382 * Reference counting: increments kref when sending ELS
1383 */
1384static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
1385{
1386 struct fc_frame *fp;
1387 struct fc_lport *lport = rdata->local_port;
1388
1389 lockdep_assert_held(&rdata->rp_mutex);
1390
1391 FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
1392 fc_rport_state(rdata));
1393
1394 fc_rport_state_enter(rdata, new: RPORT_ST_RTV);
1395
1396 fp = fc_frame_alloc(dev: lport, len: sizeof(struct fc_els_rtv));
1397 if (!fp) {
1398 fc_rport_error_retry(rdata, err: -FC_EX_ALLOC_ERR);
1399 return;
1400 }
1401
1402 kref_get(kref: &rdata->kref);
1403 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
1404 fc_rport_rtv_resp, rdata,
1405 2 * lport->r_a_tov)) {
1406 fc_rport_error_retry(rdata, err: -FC_EX_XMIT_ERR);
1407 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1408 }
1409}
1410
1411/**
1412 * fc_rport_recv_rtv_req() - Handler for Read Timeout Value (RTV) requests
1413 * @rdata: The remote port that sent the RTV request
1414 * @in_fp: The RTV request frame
1415 */
1416static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata,
1417 struct fc_frame *in_fp)
1418{
1419 struct fc_lport *lport = rdata->local_port;
1420 struct fc_frame *fp;
1421 struct fc_els_rtv_acc *rtv;
1422 struct fc_seq_els_data rjt_data;
1423
1424 lockdep_assert_held(&rdata->rp_mutex);
1425 lockdep_assert_held(&lport->lp_mutex);
1426
1427 FC_RPORT_DBG(rdata, "Received RTV request\n");
1428
1429 fp = fc_frame_alloc(dev: lport, len: sizeof(*rtv));
1430 if (!fp) {
1431 rjt_data.reason = ELS_RJT_UNAB;
1432 rjt_data.explan = ELS_EXPL_INSUF_RES;
1433 fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
1434 goto drop;
1435 }
1436 rtv = fc_frame_payload_get(fp, len: sizeof(*rtv));
1437 rtv->rtv_cmd = ELS_LS_ACC;
1438 rtv->rtv_r_a_tov = htonl(lport->r_a_tov);
1439 rtv->rtv_e_d_tov = htonl(lport->e_d_tov);
1440 rtv->rtv_toq = 0;
1441 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, parm_offset: 0);
1442 lport->tt.frame_send(lport, fp);
1443drop:
1444 fc_frame_free(fp: in_fp);
1445}
1446
1447/**
1448 * fc_rport_logo_resp() - Handler for logout (LOGO) responses
1449 * @sp: The sequence the LOGO was on
1450 * @fp: The LOGO response frame
1451 * @rdata_arg: The remote port
1452 */
1453static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1454 void *rdata_arg)
1455{
1456 struct fc_rport_priv *rdata = rdata_arg;
1457 struct fc_lport *lport = rdata->local_port;
1458
1459 FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
1460 "Received a LOGO %s\n", fc_els_resp_type(fp));
1461 if (!IS_ERR(ptr: fp))
1462 fc_frame_free(fp);
1463 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1464}
1465
1466/**
1467 * fc_rport_enter_logo() - Send a logout (LOGO) request
1468 * @rdata: The remote port to send the LOGO request to
1469 *
1470 * Reference counting: increments kref when sending ELS
1471 */
1472static void (struct fc_rport_priv *rdata)
1473{
1474 struct fc_lport *lport = rdata->local_port;
1475 struct fc_frame *fp;
1476
1477 lockdep_assert_held(&rdata->rp_mutex);
1478
1479 FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
1480 fc_rport_state(rdata));
1481
1482 fp = fc_frame_alloc(dev: lport, len: sizeof(struct fc_els_logo));
1483 if (!fp)
1484 return;
1485 kref_get(kref: &rdata->kref);
1486 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
1487 fc_rport_logo_resp, rdata, 0))
1488 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1489}
1490
1491/**
1492 * fc_rport_adisc_resp() - Handler for Address Discovery (ADISC) responses
1493 * @sp: The sequence the ADISC response was on
1494 * @fp: The ADISC response frame
1495 * @rdata_arg: The remote port that sent the ADISC response
1496 *
1497 * Locking Note: This function will be called without the rport lock
1498 * held, but it will lock, call an _enter_* function or fc_rport_error
1499 * and then unlock the rport.
1500 */
1501static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
1502 void *rdata_arg)
1503{
1504 struct fc_rport_priv *rdata = rdata_arg;
1505 struct fc_els_adisc *adisc;
1506 u8 op;
1507
1508 FC_RPORT_DBG(rdata, "Received a ADISC response\n");
1509
1510 if (fp == ERR_PTR(error: -FC_EX_CLOSED))
1511 goto put;
1512
1513 mutex_lock(&rdata->rp_mutex);
1514
1515 if (rdata->rp_state != RPORT_ST_ADISC) {
1516 FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
1517 fc_rport_state(rdata));
1518 if (IS_ERR(ptr: fp))
1519 goto err;
1520 goto out;
1521 }
1522
1523 if (IS_ERR(ptr: fp)) {
1524 fc_rport_error(rdata, err: PTR_ERR(ptr: fp));
1525 goto err;
1526 }
1527
1528 /*
1529 * If address verification failed. Consider us logged out of the rport.
1530 * Since the rport is still in discovery, we want to be
1531 * logged in, so go to PLOGI state. Otherwise, go back to READY.
1532 */
1533 op = fc_frame_payload_op(fp);
1534 adisc = fc_frame_payload_get(fp, len: sizeof(*adisc));
1535 if (op != ELS_LS_ACC || !adisc ||
1536 ntoh24(p: adisc->adisc_port_id) != rdata->ids.port_id ||
1537 get_unaligned_be64(p: &adisc->adisc_wwpn) != rdata->ids.port_name ||
1538 get_unaligned_be64(p: &adisc->adisc_wwnn) != rdata->ids.node_name) {
1539 FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
1540 fc_rport_enter_flogi(rdata);
1541 } else {
1542 FC_RPORT_DBG(rdata, "ADISC OK\n");
1543 fc_rport_enter_ready(rdata);
1544 }
1545out:
1546 fc_frame_free(fp);
1547err:
1548 mutex_unlock(lock: &rdata->rp_mutex);
1549put:
1550 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1551}
1552
1553/**
1554 * fc_rport_enter_adisc() - Send Address Discover (ADISC) request
1555 * @rdata: The remote port to send the ADISC request to
1556 *
1557 * Reference counting: increments kref when sending ELS
1558 */
1559static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
1560{
1561 struct fc_lport *lport = rdata->local_port;
1562 struct fc_frame *fp;
1563
1564 lockdep_assert_held(&rdata->rp_mutex);
1565
1566 FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
1567 fc_rport_state(rdata));
1568
1569 fc_rport_state_enter(rdata, new: RPORT_ST_ADISC);
1570
1571 fp = fc_frame_alloc(dev: lport, len: sizeof(struct fc_els_adisc));
1572 if (!fp) {
1573 fc_rport_error_retry(rdata, err: -FC_EX_ALLOC_ERR);
1574 return;
1575 }
1576 kref_get(kref: &rdata->kref);
1577 if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
1578 fc_rport_adisc_resp, rdata,
1579 2 * lport->r_a_tov)) {
1580 fc_rport_error_retry(rdata, err: -FC_EX_XMIT_ERR);
1581 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1582 }
1583}
1584
1585/**
1586 * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests
1587 * @rdata: The remote port that sent the ADISC request
1588 * @in_fp: The ADISC request frame
1589 */
1590static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
1591 struct fc_frame *in_fp)
1592{
1593 struct fc_lport *lport = rdata->local_port;
1594 struct fc_frame *fp;
1595 struct fc_els_adisc *adisc;
1596 struct fc_seq_els_data rjt_data;
1597
1598 lockdep_assert_held(&rdata->rp_mutex);
1599 lockdep_assert_held(&lport->lp_mutex);
1600
1601 FC_RPORT_DBG(rdata, "Received ADISC request\n");
1602
1603 adisc = fc_frame_payload_get(fp: in_fp, len: sizeof(*adisc));
1604 if (!adisc) {
1605 rjt_data.reason = ELS_RJT_PROT;
1606 rjt_data.explan = ELS_EXPL_INV_LEN;
1607 fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
1608 goto drop;
1609 }
1610
1611 fp = fc_frame_alloc(dev: lport, len: sizeof(*adisc));
1612 if (!fp)
1613 goto drop;
1614 fc_adisc_fill(lport, fp);
1615 adisc = fc_frame_payload_get(fp, len: sizeof(*adisc));
1616 adisc->adisc_cmd = ELS_LS_ACC;
1617 fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, parm_offset: 0);
1618 lport->tt.frame_send(lport, fp);
1619drop:
1620 fc_frame_free(fp: in_fp);
1621}
1622
1623/**
1624 * fc_rport_recv_rls_req() - Handle received Read Link Status request
1625 * @rdata: The remote port that sent the RLS request
1626 * @rx_fp: The PRLI request frame
1627 */
1628static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
1629 struct fc_frame *rx_fp)
1630
1631{
1632 struct fc_lport *lport = rdata->local_port;
1633 struct fc_frame *fp;
1634 struct fc_els_rls *rls;
1635 struct fc_els_rls_resp *rsp;
1636 struct fc_els_lesb *lesb;
1637 struct fc_seq_els_data rjt_data;
1638 struct fc_host_statistics *hst;
1639
1640 lockdep_assert_held(&rdata->rp_mutex);
1641
1642 FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
1643 fc_rport_state(rdata));
1644
1645 rls = fc_frame_payload_get(fp: rx_fp, len: sizeof(*rls));
1646 if (!rls) {
1647 rjt_data.reason = ELS_RJT_PROT;
1648 rjt_data.explan = ELS_EXPL_INV_LEN;
1649 goto out_rjt;
1650 }
1651
1652 fp = fc_frame_alloc(dev: lport, len: sizeof(*rsp));
1653 if (!fp) {
1654 rjt_data.reason = ELS_RJT_UNAB;
1655 rjt_data.explan = ELS_EXPL_INSUF_RES;
1656 goto out_rjt;
1657 }
1658
1659 rsp = fc_frame_payload_get(fp, len: sizeof(*rsp));
1660 memset(rsp, 0, sizeof(*rsp));
1661 rsp->rls_cmd = ELS_LS_ACC;
1662 lesb = &rsp->rls_lesb;
1663 if (lport->tt.get_lesb) {
1664 /* get LESB from LLD if it supports it */
1665 lport->tt.get_lesb(lport, lesb);
1666 } else {
1667 fc_get_host_stats(lport->host);
1668 hst = &lport->host_stats;
1669 lesb->lesb_link_fail = htonl(hst->link_failure_count);
1670 lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
1671 lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
1672 lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
1673 lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
1674 lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
1675 }
1676
1677 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, parm_offset: 0);
1678 lport->tt.frame_send(lport, fp);
1679 goto out;
1680
1681out_rjt:
1682 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1683out:
1684 fc_frame_free(fp: rx_fp);
1685}
1686
1687/**
1688 * fc_rport_recv_els_req() - Handler for validated ELS requests
1689 * @lport: The local port that received the ELS request
1690 * @fp: The ELS request frame
1691 *
1692 * Handle incoming ELS requests that require port login.
1693 * The ELS opcode has already been validated by the caller.
1694 *
1695 * Reference counting: does not modify kref
1696 */
1697static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp)
1698{
1699 struct fc_rport_priv *rdata;
1700 struct fc_seq_els_data els_data;
1701
1702 lockdep_assert_held(&lport->lp_mutex);
1703
1704 rdata = fc_rport_lookup(lport, fc_frame_sid(fp));
1705 if (!rdata) {
1706 FC_RPORT_ID_DBG(lport, fc_frame_sid(fp),
1707 "Received ELS 0x%02x from non-logged-in port\n",
1708 fc_frame_payload_op(fp));
1709 goto reject;
1710 }
1711
1712 mutex_lock(&rdata->rp_mutex);
1713
1714 switch (rdata->rp_state) {
1715 case RPORT_ST_PRLI:
1716 case RPORT_ST_RTV:
1717 case RPORT_ST_READY:
1718 case RPORT_ST_ADISC:
1719 break;
1720 case RPORT_ST_PLOGI:
1721 if (fc_frame_payload_op(fp) == ELS_PRLI) {
1722 FC_RPORT_DBG(rdata, "Reject ELS PRLI "
1723 "while in state %s\n",
1724 fc_rport_state(rdata));
1725 mutex_unlock(lock: &rdata->rp_mutex);
1726 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1727 goto busy;
1728 }
1729 fallthrough;
1730 default:
1731 FC_RPORT_DBG(rdata,
1732 "Reject ELS 0x%02x while in state %s\n",
1733 fc_frame_payload_op(fp), fc_rport_state(rdata));
1734 mutex_unlock(lock: &rdata->rp_mutex);
1735 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1736 goto reject;
1737 }
1738
1739 switch (fc_frame_payload_op(fp)) {
1740 case ELS_PRLI:
1741 fc_rport_recv_prli_req(rdata, fp);
1742 break;
1743 case ELS_PRLO:
1744 fc_rport_recv_prlo_req(rdata, fp);
1745 break;
1746 case ELS_ADISC:
1747 fc_rport_recv_adisc_req(rdata, in_fp: fp);
1748 break;
1749 case ELS_RRQ:
1750 fc_seq_els_rsp_send(fp, ELS_RRQ, NULL);
1751 fc_frame_free(fp);
1752 break;
1753 case ELS_REC:
1754 fc_seq_els_rsp_send(fp, ELS_REC, NULL);
1755 fc_frame_free(fp);
1756 break;
1757 case ELS_RLS:
1758 fc_rport_recv_rls_req(rdata, rx_fp: fp);
1759 break;
1760 case ELS_RTV:
1761 fc_rport_recv_rtv_req(rdata, in_fp: fp);
1762 break;
1763 default:
1764 fc_frame_free(fp); /* can't happen */
1765 break;
1766 }
1767
1768 mutex_unlock(lock: &rdata->rp_mutex);
1769 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
1770 return;
1771
1772reject:
1773 els_data.reason = ELS_RJT_UNAB;
1774 els_data.explan = ELS_EXPL_PLOGI_REQD;
1775 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1776 fc_frame_free(fp);
1777 return;
1778
1779busy:
1780 els_data.reason = ELS_RJT_BUSY;
1781 els_data.explan = ELS_EXPL_NONE;
1782 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1783 fc_frame_free(fp);
1784 return;
1785}
1786
1787/**
1788 * fc_rport_recv_req() - Handler for requests
1789 * @lport: The local port that received the request
1790 * @fp: The request frame
1791 *
1792 * Reference counting: does not modify kref
1793 */
1794void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp)
1795{
1796 struct fc_seq_els_data els_data;
1797
1798 lockdep_assert_held(&lport->lp_mutex);
1799
1800 /*
1801 * Handle FLOGI, PLOGI and LOGO requests separately, since they
1802 * don't require prior login.
1803 * Check for unsupported opcodes first and reject them.
1804 * For some ops, it would be incorrect to reject with "PLOGI required".
1805 */
1806 switch (fc_frame_payload_op(fp)) {
1807 case ELS_FLOGI:
1808 fc_rport_recv_flogi_req(lport, rx_fp: fp);
1809 break;
1810 case ELS_PLOGI:
1811 fc_rport_recv_plogi_req(lport, fp);
1812 break;
1813 case ELS_LOGO:
1814 fc_rport_recv_logo_req(lport, fp);
1815 break;
1816 case ELS_PRLI:
1817 case ELS_PRLO:
1818 case ELS_ADISC:
1819 case ELS_RRQ:
1820 case ELS_REC:
1821 case ELS_RLS:
1822 case ELS_RTV:
1823 fc_rport_recv_els_req(lport, fp);
1824 break;
1825 default:
1826 els_data.reason = ELS_RJT_UNSUP;
1827 els_data.explan = ELS_EXPL_NONE;
1828 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
1829 fc_frame_free(fp);
1830 break;
1831 }
1832}
1833EXPORT_SYMBOL(fc_rport_recv_req);
1834
1835/**
1836 * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests
1837 * @lport: The local port that received the PLOGI request
1838 * @rx_fp: The PLOGI request frame
1839 *
1840 * Reference counting: increments kref on return
1841 */
1842static void fc_rport_recv_plogi_req(struct fc_lport *lport,
1843 struct fc_frame *rx_fp)
1844{
1845 struct fc_disc *disc;
1846 struct fc_rport_priv *rdata;
1847 struct fc_frame *fp = rx_fp;
1848 struct fc_els_flogi *pl;
1849 struct fc_seq_els_data rjt_data;
1850 u32 sid;
1851
1852 lockdep_assert_held(&lport->lp_mutex);
1853
1854 sid = fc_frame_sid(fp);
1855
1856 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
1857
1858 pl = fc_frame_payload_get(fp, len: sizeof(*pl));
1859 if (!pl) {
1860 FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
1861 rjt_data.reason = ELS_RJT_PROT;
1862 rjt_data.explan = ELS_EXPL_INV_LEN;
1863 goto reject;
1864 }
1865
1866 disc = &lport->disc;
1867 mutex_lock(&disc->disc_mutex);
1868 rdata = fc_rport_create(lport, sid);
1869 if (!rdata) {
1870 mutex_unlock(lock: &disc->disc_mutex);
1871 rjt_data.reason = ELS_RJT_UNAB;
1872 rjt_data.explan = ELS_EXPL_INSUF_RES;
1873 goto reject;
1874 }
1875
1876 mutex_lock(&rdata->rp_mutex);
1877 mutex_unlock(lock: &disc->disc_mutex);
1878
1879 rdata->ids.port_name = get_unaligned_be64(p: &pl->fl_wwpn);
1880 rdata->ids.node_name = get_unaligned_be64(p: &pl->fl_wwnn);
1881
1882 /*
1883 * If the rport was just created, possibly due to the incoming PLOGI,
1884 * set the state appropriately and accept the PLOGI.
1885 *
1886 * If we had also sent a PLOGI, and if the received PLOGI is from a
1887 * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
1888 * "command already in progress".
1889 *
1890 * XXX TBD: If the session was ready before, the PLOGI should result in
1891 * all outstanding exchanges being reset.
1892 */
1893 switch (rdata->rp_state) {
1894 case RPORT_ST_INIT:
1895 FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
1896 break;
1897 case RPORT_ST_PLOGI_WAIT:
1898 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n");
1899 break;
1900 case RPORT_ST_PLOGI:
1901 FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
1902 if (rdata->ids.port_name < lport->wwpn) {
1903 mutex_unlock(lock: &rdata->rp_mutex);
1904 rjt_data.reason = ELS_RJT_INPROG;
1905 rjt_data.explan = ELS_EXPL_NONE;
1906 goto reject;
1907 }
1908 break;
1909 case RPORT_ST_PRLI:
1910 case RPORT_ST_RTV:
1911 case RPORT_ST_READY:
1912 case RPORT_ST_ADISC:
1913 FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
1914 "- ignored for now\n", rdata->rp_state);
1915 /* XXX TBD - should reset */
1916 break;
1917 case RPORT_ST_FLOGI:
1918 case RPORT_ST_DELETE:
1919 FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
1920 fc_rport_state(rdata));
1921 mutex_unlock(lock: &rdata->rp_mutex);
1922 rjt_data.reason = ELS_RJT_BUSY;
1923 rjt_data.explan = ELS_EXPL_NONE;
1924 goto reject;
1925 }
1926 if (!fc_rport_compatible_roles(lport, rdata)) {
1927 FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n");
1928 mutex_unlock(lock: &rdata->rp_mutex);
1929 rjt_data.reason = ELS_RJT_LOGIC;
1930 rjt_data.explan = ELS_EXPL_NONE;
1931 goto reject;
1932 }
1933
1934 /*
1935 * Get session payload size from incoming PLOGI.
1936 */
1937 rdata->maxframe_size = fc_plogi_get_maxframe(flp: pl, maxval: lport->mfs);
1938
1939 /*
1940 * Send LS_ACC. If this fails, the originator should retry.
1941 */
1942 fp = fc_frame_alloc(dev: lport, len: sizeof(*pl));
1943 if (!fp)
1944 goto out;
1945
1946 fc_plogi_fill(lport, fp, op: ELS_LS_ACC);
1947 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, parm_offset: 0);
1948 lport->tt.frame_send(lport, fp);
1949 fc_rport_enter_prli(rdata);
1950out:
1951 mutex_unlock(lock: &rdata->rp_mutex);
1952 fc_frame_free(fp: rx_fp);
1953 return;
1954
1955reject:
1956 fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
1957 fc_frame_free(fp);
1958}
1959
1960/**
1961 * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests
1962 * @rdata: The remote port that sent the PRLI request
1963 * @rx_fp: The PRLI request frame
1964 */
1965static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
1966 struct fc_frame *rx_fp)
1967{
1968 struct fc_lport *lport = rdata->local_port;
1969 struct fc_frame *fp;
1970 struct {
1971 struct fc_els_prli prli;
1972 struct fc_els_spp spp;
1973 } *pp;
1974 struct fc_els_spp *rspp; /* request service param page */
1975 struct fc_els_spp *spp; /* response spp */
1976 unsigned int len;
1977 unsigned int plen;
1978 enum fc_els_spp_resp resp;
1979 struct fc_seq_els_data rjt_data;
1980 struct fc4_prov *prov;
1981
1982 lockdep_assert_held(&rdata->rp_mutex);
1983
1984 FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
1985 fc_rport_state(rdata));
1986
1987 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
1988 pp = fc_frame_payload_get(fp: rx_fp, len: sizeof(*pp));
1989 if (!pp)
1990 goto reject_len;
1991 plen = ntohs(pp->prli.prli_len);
1992 if ((plen % 4) != 0 || plen > len || plen < 16)
1993 goto reject_len;
1994 if (plen < len)
1995 len = plen;
1996 plen = pp->prli.prli_spp_len;
1997 if ((plen % 4) != 0 || plen < sizeof(*spp) ||
1998 plen > len || len < sizeof(*pp) || plen < 12)
1999 goto reject_len;
2000 rspp = &pp->spp;
2001
2002 fp = fc_frame_alloc(dev: lport, len);
2003 if (!fp) {
2004 rjt_data.reason = ELS_RJT_UNAB;
2005 rjt_data.explan = ELS_EXPL_INSUF_RES;
2006 goto reject;
2007 }
2008 pp = fc_frame_payload_get(fp, len);
2009 WARN_ON(!pp);
2010 memset(pp, 0, len);
2011 pp->prli.prli_cmd = ELS_LS_ACC;
2012 pp->prli.prli_spp_len = plen;
2013 pp->prli.prli_len = htons(len);
2014 len -= sizeof(struct fc_els_prli);
2015
2016 /*
2017 * Go through all the service parameter pages and build
2018 * response. If plen indicates longer SPP than standard,
2019 * use that. The entire response has been pre-cleared above.
2020 */
2021 spp = &pp->spp;
2022 mutex_lock(&fc_prov_mutex);
2023 while (len >= plen) {
2024 rdata->spp_type = rspp->spp_type;
2025 spp->spp_type = rspp->spp_type;
2026 spp->spp_type_ext = rspp->spp_type_ext;
2027 resp = 0;
2028
2029 if (rspp->spp_type < FC_FC4_PROV_SIZE) {
2030 enum fc_els_spp_resp active = 0, passive = 0;
2031
2032 prov = fc_active_prov[rspp->spp_type];
2033 if (prov)
2034 active = prov->prli(rdata, plen, rspp, spp);
2035 prov = fc_passive_prov[rspp->spp_type];
2036 if (prov)
2037 passive = prov->prli(rdata, plen, rspp, spp);
2038 if (!active || passive == FC_SPP_RESP_ACK)
2039 resp = passive;
2040 else
2041 resp = active;
2042 FC_RPORT_DBG(rdata, "PRLI rspp type %x "
2043 "active %x passive %x\n",
2044 rspp->spp_type, active, passive);
2045 }
2046 if (!resp) {
2047 if (spp->spp_flags & FC_SPP_EST_IMG_PAIR)
2048 resp |= FC_SPP_RESP_CONF;
2049 else
2050 resp |= FC_SPP_RESP_INVL;
2051 }
2052 spp->spp_flags |= resp;
2053 len -= plen;
2054 rspp = (struct fc_els_spp *)((char *)rspp + plen);
2055 spp = (struct fc_els_spp *)((char *)spp + plen);
2056 }
2057 mutex_unlock(lock: &fc_prov_mutex);
2058
2059 /*
2060 * Send LS_ACC. If this fails, the originator should retry.
2061 */
2062 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, parm_offset: 0);
2063 lport->tt.frame_send(lport, fp);
2064
2065 goto drop;
2066
2067reject_len:
2068 rjt_data.reason = ELS_RJT_PROT;
2069 rjt_data.explan = ELS_EXPL_INV_LEN;
2070reject:
2071 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
2072drop:
2073 fc_frame_free(fp: rx_fp);
2074}
2075
2076/**
2077 * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
2078 * @rdata: The remote port that sent the PRLO request
2079 * @rx_fp: The PRLO request frame
2080 */
2081static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
2082 struct fc_frame *rx_fp)
2083{
2084 struct fc_lport *lport = rdata->local_port;
2085 struct fc_frame *fp;
2086 struct {
2087 struct fc_els_prlo prlo;
2088 struct fc_els_spp spp;
2089 } *pp;
2090 struct fc_els_spp *rspp; /* request service param page */
2091 struct fc_els_spp *spp; /* response spp */
2092 unsigned int len;
2093 unsigned int plen;
2094 struct fc_seq_els_data rjt_data;
2095
2096 lockdep_assert_held(&rdata->rp_mutex);
2097
2098 FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
2099 fc_rport_state(rdata));
2100
2101 len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
2102 pp = fc_frame_payload_get(fp: rx_fp, len: sizeof(*pp));
2103 if (!pp)
2104 goto reject_len;
2105 plen = ntohs(pp->prlo.prlo_len);
2106 if (plen != 20)
2107 goto reject_len;
2108 if (plen < len)
2109 len = plen;
2110
2111 rspp = &pp->spp;
2112
2113 fp = fc_frame_alloc(dev: lport, len);
2114 if (!fp) {
2115 rjt_data.reason = ELS_RJT_UNAB;
2116 rjt_data.explan = ELS_EXPL_INSUF_RES;
2117 goto reject;
2118 }
2119
2120 pp = fc_frame_payload_get(fp, len);
2121 WARN_ON(!pp);
2122 memset(pp, 0, len);
2123 pp->prlo.prlo_cmd = ELS_LS_ACC;
2124 pp->prlo.prlo_obs = 0x10;
2125 pp->prlo.prlo_len = htons(len);
2126 spp = &pp->spp;
2127 spp->spp_type = rspp->spp_type;
2128 spp->spp_type_ext = rspp->spp_type_ext;
2129 spp->spp_flags = FC_SPP_RESP_ACK;
2130
2131 fc_rport_enter_prli(rdata);
2132
2133 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, parm_offset: 0);
2134 lport->tt.frame_send(lport, fp);
2135 goto drop;
2136
2137reject_len:
2138 rjt_data.reason = ELS_RJT_PROT;
2139 rjt_data.explan = ELS_EXPL_INV_LEN;
2140reject:
2141 fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
2142drop:
2143 fc_frame_free(fp: rx_fp);
2144}
2145
2146/**
2147 * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests
2148 * @lport: The local port that received the LOGO request
2149 * @fp: The LOGO request frame
2150 *
2151 * Reference counting: drops kref on return
2152 */
2153static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
2154{
2155 struct fc_rport_priv *rdata;
2156 u32 sid;
2157
2158 lockdep_assert_held(&lport->lp_mutex);
2159
2160 fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
2161
2162 sid = fc_frame_sid(fp);
2163
2164 rdata = fc_rport_lookup(lport, sid);
2165 if (rdata) {
2166 mutex_lock(&rdata->rp_mutex);
2167 FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
2168 fc_rport_state(rdata));
2169
2170 fc_rport_enter_delete(rdata, event: RPORT_EV_STOP);
2171 mutex_unlock(lock: &rdata->rp_mutex);
2172 kref_put(kref: &rdata->kref, release: fc_rport_destroy);
2173 } else
2174 FC_RPORT_ID_DBG(lport, sid,
2175 "Received LOGO from non-logged-in port\n");
2176 fc_frame_free(fp);
2177}
2178
2179/**
2180 * fc_rport_flush_queue() - Flush the rport_event_queue
2181 */
2182void fc_rport_flush_queue(void)
2183{
2184 flush_workqueue(rport_event_queue);
2185}
2186EXPORT_SYMBOL(fc_rport_flush_queue);
2187
2188/**
2189 * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator.
2190 * @rdata: remote port private
2191 * @spp_len: service parameter page length
2192 * @rspp: received service parameter page
2193 * @spp: response service parameter page
2194 *
2195 * Returns the value for the response code to be placed in spp_flags;
2196 * Returns 0 if not an initiator.
2197 */
2198static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len,
2199 const struct fc_els_spp *rspp,
2200 struct fc_els_spp *spp)
2201{
2202 struct fc_lport *lport = rdata->local_port;
2203 u32 fcp_parm;
2204
2205 fcp_parm = ntohl(rspp->spp_params);
2206 rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
2207 if (fcp_parm & FCP_SPPF_INIT_FCN)
2208 rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
2209 if (fcp_parm & FCP_SPPF_TARG_FCN)
2210 rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET;
2211 if (fcp_parm & FCP_SPPF_RETRY)
2212 rdata->flags |= FC_RP_FLAGS_RETRY;
2213 rdata->supported_classes = FC_COS_CLASS3;
2214
2215 if (!(lport->service_params & FCP_SPPF_INIT_FCN))
2216 return 0;
2217
2218 spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
2219
2220 /*
2221 * OR in our service parameters with other providers (target), if any.
2222 */
2223 fcp_parm = ntohl(spp->spp_params);
2224 spp->spp_params = htonl(fcp_parm | lport->service_params);
2225 return FC_SPP_RESP_ACK;
2226}
2227
2228/*
2229 * FC-4 provider ops for FCP initiator.
2230 */
2231struct fc4_prov fc_rport_fcp_init = {
2232 .prli = fc_rport_fcp_prli,
2233};
2234
2235/**
2236 * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0
2237 * @rdata: remote port private
2238 * @spp_len: service parameter page length
2239 * @rspp: received service parameter page
2240 * @spp: response service parameter page
2241 */
2242static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len,
2243 const struct fc_els_spp *rspp,
2244 struct fc_els_spp *spp)
2245{
2246 if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR)
2247 return FC_SPP_RESP_INVL;
2248 return FC_SPP_RESP_ACK;
2249}
2250
2251/*
2252 * FC-4 provider ops for type 0 service parameters.
2253 *
2254 * This handles the special case of type 0 which is always successful
2255 * but doesn't do anything otherwise.
2256 */
2257struct fc4_prov fc_rport_t0_prov = {
2258 .prli = fc_rport_t0_prli,
2259};
2260
2261/**
2262 * fc_setup_rport() - Initialize the rport_event_queue
2263 */
2264int fc_setup_rport(void)
2265{
2266 rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
2267 if (!rport_event_queue)
2268 return -ENOMEM;
2269 return 0;
2270}
2271
2272/**
2273 * fc_destroy_rport() - Destroy the rport_event_queue
2274 */
2275void fc_destroy_rport(void)
2276{
2277 destroy_workqueue(wq: rport_event_queue);
2278}
2279
2280/**
2281 * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port
2282 * @rport: The remote port whose I/O should be terminated
2283 */
2284void fc_rport_terminate_io(struct fc_rport *rport)
2285{
2286 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
2287 struct fc_lport *lport = rpriv->local_port;
2288
2289 lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
2290 lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
2291}
2292EXPORT_SYMBOL(fc_rport_terminate_io);
2293

source code of linux/drivers/scsi/libfc/fc_rport.c