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 
65 static struct workqueue_struct *rport_event_queue;
66 
67 static void fc_rport_enter_flogi(struct fc_rport_priv *);
68 static void fc_rport_enter_plogi(struct fc_rport_priv *);
69 static void fc_rport_enter_prli(struct fc_rport_priv *);
70 static void fc_rport_enter_rtv(struct fc_rport_priv *);
71 static void fc_rport_enter_ready(struct fc_rport_priv *);
72 static void fc_rport_enter_logo(struct fc_rport_priv *);
73 static void fc_rport_enter_adisc(struct fc_rport_priv *);
74 
75 static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
76 static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
77 static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
78 static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *);
79 static void fc_rport_timeout(struct work_struct *);
80 static void fc_rport_error(struct fc_rport_priv *, int);
81 static void fc_rport_error_retry(struct fc_rport_priv *, int);
82 static void fc_rport_work(struct work_struct *);
83 
84 static 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  */
fc_rport_lookup(const struct fc_lport * lport,u32 port_id)104 struct 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(&tmp_rdata->kref)) {
113 			rdata = tmp_rdata;
114 			break;
115 		}
116 	rcu_read_unlock();
117 	return rdata;
118 }
119 EXPORT_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  */
fc_rport_create(struct fc_lport * lport,u32 port_id)128 struct 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(&rdata->kref, 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(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(&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(&rdata->peers, &lport->disc.rports);
166 	}
167 	return rdata;
168 }
169 EXPORT_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  */
fc_rport_destroy(struct kref * kref)175 void 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 }
182 EXPORT_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  */
fc_rport_state(struct fc_rport_priv * rdata)188 static 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  */
fc_set_rport_loss_tmo(struct fc_rport * rport,u32 timeout)203 void 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 }
210 EXPORT_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  */
fc_plogi_get_maxframe(struct fc_els_flogi * flp,unsigned int maxval)219 static 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  */
fc_rport_state_enter(struct fc_rport_priv * rdata,enum fc_rport_state new)242 static 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  */
fc_rport_work(struct work_struct * work)258 static 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(&rdata->kref);
285 		mutex_unlock(&rdata->rp_mutex);
286 
287 		if (!rport) {
288 			FC_RPORT_DBG(rdata, "No rport!\n");
289 			rport = fc_remote_port_add(lport->host, 0, &ids);
290 		}
291 		if (!rport) {
292 			FC_RPORT_DBG(rdata, "Failed to add the rport\n");
293 			fc_rport_logoff(rdata);
294 			kref_put(&rdata->kref, 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(&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(&rdata->kref, 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(&fc_prov_mutex);
334 		}
335 		port_id = rdata->ids.port_id;
336 		mutex_unlock(&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(&rdata->retry_work))
347 			kref_put(&rdata->kref, 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(&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(&rdata->rp_mutex);
369 				kref_put(&rdata->kref, 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(&rdata->rp_mutex);
378 			} else {
379 				mutex_unlock(&rdata->rp_mutex);
380 				FC_RPORT_DBG(rdata, "work delete\n");
381 				mutex_lock(&lport->disc.disc_mutex);
382 				list_del_rcu(&rdata->peers);
383 				mutex_unlock(&lport->disc.disc_mutex);
384 				kref_put(&rdata->kref, 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(&rdata->rp_mutex);
396 		}
397 		break;
398 
399 	default:
400 		mutex_unlock(&rdata->rp_mutex);
401 		break;
402 	}
403 	kref_put(&rdata->kref, 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  */
fc_rport_login(struct fc_rport_priv * rdata)426 int 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(&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(&rdata->rp_mutex);
455 
456 	return 0;
457 }
458 EXPORT_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  */
fc_rport_enter_delete(struct fc_rport_priv * rdata,enum fc_rport_event event)474 static 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, RPORT_ST_DELETE);
485 
486 	if (rdata->event == RPORT_EV_NONE) {
487 		kref_get(&rdata->kref);
488 		if (!queue_work(rport_event_queue, &rdata->event_work))
489 			kref_put(&rdata->kref, 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  */
fc_rport_logoff(struct fc_rport_priv * rdata)503 int 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, RPORT_EV_STOP);
533 out:
534 	mutex_unlock(&rdata->rp_mutex);
535 	return 0;
536 }
537 EXPORT_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  */
fc_rport_enter_ready(struct fc_rport_priv * rdata)545 static 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, RPORT_ST_READY);
550 
551 	FC_RPORT_DBG(rdata, "Port is Ready\n");
552 
553 	kref_get(&rdata->kref);
554 	if (rdata->event == RPORT_EV_NONE &&
555 	    !queue_work(rport_event_queue, &rdata->event_work))
556 		kref_put(&rdata->kref, 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  */
fc_rport_timeout(struct work_struct * work)571 static 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(&rdata->rp_mutex);
603 	kref_put(&rdata->kref, 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  */
fc_rport_error(struct fc_rport_priv * rdata,int err)613 static 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, 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, 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  */
fc_rport_error_retry(struct fc_rport_priv * rdata,int err)661 static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err)
662 {
663 	unsigned long delay = msecs_to_jiffies(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(&rdata->kref);
679 		if (!schedule_delayed_work(&rdata->retry_work, delay))
680 			kref_put(&rdata->kref, fc_rport_destroy);
681 		return;
682 	}
683 
684 out:
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  */
fc_rport_login_complete(struct fc_rport_priv * rdata,struct fc_frame * fp)698 static 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, 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(flogi, 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  */
fc_rport_flogi_resp(struct fc_seq * sp,struct fc_frame * fp,void * rp_arg)738 static 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(-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(fp))
760 			goto err;
761 		goto out;
762 	}
763 
764 	if (IS_ERR(fp)) {
765 		fc_rport_error(rdata, PTR_ERR(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, 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, 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, RPORT_ST_PLOGI_WAIT);
801 out:
802 	fc_frame_free(fp);
803 err:
804 	mutex_unlock(&rdata->rp_mutex);
805 put:
806 	kref_put(&rdata->kref, fc_rport_destroy);
807 	return;
808 bad:
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  */
fc_rport_enter_flogi(struct fc_rport_priv * rdata)820 static 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, RPORT_ST_FLOGI);
834 
835 	fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
836 	if (!fp)
837 		return fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
838 
839 	kref_get(&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, -FC_EX_XMIT_ERR);
844 		kref_put(&rdata->kref, 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  */
fc_rport_recv_flogi_req(struct fc_lport * lport,struct fc_frame * rx_fp)855 static 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, 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(&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, RPORT_EV_LOGO);
925 		mutex_unlock(&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(&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(lport, sizeof(*flp));
938 	if (!fp)
939 		goto out;
940 
941 	fc_flogi_fill(lport, fp);
942 	flp = fc_frame_payload_get(fp, sizeof(*flp));
943 	flp->fl_cmd = ELS_LS_ACC;
944 
945 	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 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, RPORT_ST_PLOGI_WAIT);
958 	}
959 out:
960 	mutex_unlock(&rdata->rp_mutex);
961 	kref_put(&rdata->kref, fc_rport_destroy);
962 	fc_frame_free(rx_fp);
963 	return;
964 
965 reject_put:
966 	kref_put(&rdata->kref, fc_rport_destroy);
967 reject:
968 	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
969 	fc_frame_free(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  */
fc_rport_plogi_resp(struct fc_seq * sp,struct fc_frame * fp,void * rdata_arg)982 static 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(-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(fp))
1003 			goto err;
1004 		goto out;
1005 	}
1006 
1007 	if (IS_ERR(fp)) {
1008 		fc_rport_error_retry(rdata, PTR_ERR(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, sizeof(*plp))) != NULL) {
1015 		rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
1016 		rdata->ids.node_name = get_unaligned_be64(&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(plp, 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, 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, -FC_EX_ELS_RJT);
1040 	}
1041 out:
1042 	fc_frame_free(fp);
1043 err:
1044 	mutex_unlock(&rdata->rp_mutex);
1045 put:
1046 	kref_put(&rdata->kref, fc_rport_destroy);
1047 }
1048 
1049 static bool
fc_rport_compatible_roles(struct fc_lport * lport,struct fc_rport_priv * rdata)1050 fc_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  */
fc_rport_enter_plogi(struct fc_rport_priv * rdata)1069 static 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, 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, RPORT_ST_PLOGI);
1086 
1087 	rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
1088 	fp = fc_frame_alloc(lport, 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, -FC_EX_ALLOC_ERR);
1092 		return;
1093 	}
1094 	rdata->e_d_tov = lport->e_d_tov;
1095 
1096 	kref_get(&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, -FC_EX_XMIT_ERR);
1101 		kref_put(&rdata->kref, 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  */
fc_rport_prli_resp(struct fc_seq * sp,struct fc_frame * fp,void * rdata_arg)1115 static 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(-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(fp))
1142 			goto err;
1143 		goto out;
1144 	}
1145 
1146 	if (IS_ERR(fp)) {
1147 		fc_rport_error_retry(rdata, PTR_ERR(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, sizeof(*pp));
1157 		if (!pp) {
1158 			fc_rport_error_retry(rdata, -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, -FC_EX_SEQ_ERR);
1170 			else
1171 				fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
1172 			goto out;
1173 		}
1174 		if (pp->prli.prli_spp_len < sizeof(pp->spp)) {
1175 			fc_rport_error_retry(rdata, -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, 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 
1231 out:
1232 	fc_frame_free(fp);
1233 err:
1234 	mutex_unlock(&rdata->rp_mutex);
1235 put:
1236 	kref_put(&rdata->kref, 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  */
fc_rport_enter_prli(struct fc_rport_priv * rdata)1245 static 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, RPORT_ST_PRLI);
1279 
1280 	fp = fc_frame_alloc(lport, sizeof(*pp));
1281 	if (!fp) {
1282 		fc_rport_error_retry(rdata, -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, sizeof(*pp));
1291 		prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
1292 	}
1293 
1294 	fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id,
1295 		       fc_host_port_id(lport->host), FC_TYPE_ELS,
1296 		       FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1297 
1298 	kref_get(&rdata->kref);
1299 	if (!fc_exch_seq_send(lport, fp, fc_rport_prli_resp,
1300 			      NULL, rdata, 2 * lport->r_a_tov)) {
1301 		fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
1302 		kref_put(&rdata->kref, 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  */
fc_rport_rtv_resp(struct fc_seq * sp,struct fc_frame * fp,void * rdata_arg)1318 static 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(-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(fp))
1335 			goto err;
1336 		goto out;
1337 	}
1338 
1339 	if (IS_ERR(fp)) {
1340 		fc_rport_error(rdata, PTR_ERR(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, 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 
1370 out:
1371 	fc_frame_free(fp);
1372 err:
1373 	mutex_unlock(&rdata->rp_mutex);
1374 put:
1375 	kref_put(&rdata->kref, 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  */
fc_rport_enter_rtv(struct fc_rport_priv * rdata)1384 static 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, RPORT_ST_RTV);
1395 
1396 	fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
1397 	if (!fp) {
1398 		fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
1399 		return;
1400 	}
1401 
1402 	kref_get(&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, -FC_EX_XMIT_ERR);
1407 		kref_put(&rdata->kref, 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  */
fc_rport_recv_rtv_req(struct fc_rport_priv * rdata,struct fc_frame * in_fp)1416 static 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(lport, 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, 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, 0);
1442 	lport->tt.frame_send(lport, fp);
1443 drop:
1444 	fc_frame_free(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  */
fc_rport_logo_resp(struct fc_seq * sp,struct fc_frame * fp,void * rdata_arg)1453 static 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(fp))
1462 		fc_frame_free(fp);
1463 	kref_put(&rdata->kref, 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  */
fc_rport_enter_logo(struct fc_rport_priv * rdata)1472 static void fc_rport_enter_logo(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(lport, sizeof(struct fc_els_logo));
1483 	if (!fp)
1484 		return;
1485 	kref_get(&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(&rdata->kref, 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  */
fc_rport_adisc_resp(struct fc_seq * sp,struct fc_frame * fp,void * rdata_arg)1501 static 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(-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(fp))
1519 			goto err;
1520 		goto out;
1521 	}
1522 
1523 	if (IS_ERR(fp)) {
1524 		fc_rport_error(rdata, PTR_ERR(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, sizeof(*adisc));
1535 	if (op != ELS_LS_ACC || !adisc ||
1536 	    ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
1537 	    get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
1538 	    get_unaligned_be64(&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 	}
1545 out:
1546 	fc_frame_free(fp);
1547 err:
1548 	mutex_unlock(&rdata->rp_mutex);
1549 put:
1550 	kref_put(&rdata->kref, 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  */
fc_rport_enter_adisc(struct fc_rport_priv * rdata)1559 static 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, RPORT_ST_ADISC);
1570 
1571 	fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
1572 	if (!fp) {
1573 		fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
1574 		return;
1575 	}
1576 	kref_get(&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, -FC_EX_XMIT_ERR);
1581 		kref_put(&rdata->kref, 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  */
fc_rport_recv_adisc_req(struct fc_rport_priv * rdata,struct fc_frame * in_fp)1590 static 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(in_fp, 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(lport, sizeof(*adisc));
1612 	if (!fp)
1613 		goto drop;
1614 	fc_adisc_fill(lport, fp);
1615 	adisc = fc_frame_payload_get(fp, sizeof(*adisc));
1616 	adisc->adisc_cmd = ELS_LS_ACC;
1617 	fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
1618 	lport->tt.frame_send(lport, fp);
1619 drop:
1620 	fc_frame_free(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  */
fc_rport_recv_rls_req(struct fc_rport_priv * rdata,struct fc_frame * rx_fp)1628 static 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(rx_fp, 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(lport, 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, 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, 0);
1678 	lport->tt.frame_send(lport, fp);
1679 	goto out;
1680 
1681 out_rjt:
1682 	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
1683 out:
1684 	fc_frame_free(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  */
fc_rport_recv_els_req(struct fc_lport * lport,struct fc_frame * fp)1697 static 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(&rdata->rp_mutex);
1726 			kref_put(&rdata->kref, 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(&rdata->rp_mutex);
1735 		kref_put(&rdata->kref, 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, 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, fp);
1759 		break;
1760 	case ELS_RTV:
1761 		fc_rport_recv_rtv_req(rdata, fp);
1762 		break;
1763 	default:
1764 		fc_frame_free(fp);	/* can't happen */
1765 		break;
1766 	}
1767 
1768 	mutex_unlock(&rdata->rp_mutex);
1769 	kref_put(&rdata->kref, fc_rport_destroy);
1770 	return;
1771 
1772 reject:
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 
1779 busy:
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  */
fc_rport_recv_req(struct fc_lport * lport,struct fc_frame * fp)1794 void 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, 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 }
1833 EXPORT_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  */
fc_rport_recv_plogi_req(struct fc_lport * lport,struct fc_frame * rx_fp)1842 static 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, 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(&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(&disc->disc_mutex);
1878 
1879 	rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
1880 	rdata->ids.node_name = get_unaligned_be64(&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(&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(&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(&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(pl, lport->mfs);
1938 
1939 	/*
1940 	 * Send LS_ACC.	 If this fails, the originator should retry.
1941 	 */
1942 	fp = fc_frame_alloc(lport, sizeof(*pl));
1943 	if (!fp)
1944 		goto out;
1945 
1946 	fc_plogi_fill(lport, fp, ELS_LS_ACC);
1947 	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1948 	lport->tt.frame_send(lport, fp);
1949 	fc_rport_enter_prli(rdata);
1950 out:
1951 	mutex_unlock(&rdata->rp_mutex);
1952 	fc_frame_free(rx_fp);
1953 	return;
1954 
1955 reject:
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  */
fc_rport_recv_prli_req(struct fc_rport_priv * rdata,struct fc_frame * rx_fp)1965 static 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(rx_fp, 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(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(&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, 0);
2063 	lport->tt.frame_send(lport, fp);
2064 
2065 	goto drop;
2066 
2067 reject_len:
2068 	rjt_data.reason = ELS_RJT_PROT;
2069 	rjt_data.explan = ELS_EXPL_INV_LEN;
2070 reject:
2071 	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
2072 drop:
2073 	fc_frame_free(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  */
fc_rport_recv_prlo_req(struct fc_rport_priv * rdata,struct fc_frame * rx_fp)2081 static 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(rx_fp, 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(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, 0);
2134 	lport->tt.frame_send(lport, fp);
2135 	goto drop;
2136 
2137 reject_len:
2138 	rjt_data.reason = ELS_RJT_PROT;
2139 	rjt_data.explan = ELS_EXPL_INV_LEN;
2140 reject:
2141 	fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
2142 drop:
2143 	fc_frame_free(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  */
fc_rport_recv_logo_req(struct fc_lport * lport,struct fc_frame * fp)2153 static 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, RPORT_EV_STOP);
2171 		mutex_unlock(&rdata->rp_mutex);
2172 		kref_put(&rdata->kref, 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  */
fc_rport_flush_queue(void)2182 void fc_rport_flush_queue(void)
2183 {
2184 	flush_workqueue(rport_event_queue);
2185 }
2186 EXPORT_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  */
fc_rport_fcp_prli(struct fc_rport_priv * rdata,u32 spp_len,const struct fc_els_spp * rspp,struct fc_els_spp * spp)2198 static 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  */
2231 struct 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  */
fc_rport_t0_prli(struct fc_rport_priv * rdata,u32 spp_len,const struct fc_els_spp * rspp,struct fc_els_spp * spp)2242 static 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  */
2257 struct 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  */
fc_setup_rport(void)2264 int 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  */
fc_destroy_rport(void)2275 void fc_destroy_rport(void)
2276 {
2277 	destroy_workqueue(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  */
fc_rport_terminate_io(struct fc_rport * rport)2284 void 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 }
2292 EXPORT_SYMBOL(fc_rport_terminate_io);
2293