blob: 7b47ab1389ca0d451b12f5c49d05be1c1a0dfc22 [file] [log] [blame]
Robert Love42e9a922008-12-09 15:10:17 -08001/*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Maintained at www.Open-FCoE.org
20 */
21
22/*
23 * Fibre Channel exchange and sequence handling.
24 */
25
26#include <linux/timer.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Robert Love42e9a922008-12-09 15:10:17 -080028#include <linux/err.h>
Paul Gortmaker09703662011-05-27 09:37:25 -040029#include <linux/export.h>
Bart Van Asschea84ea8c2013-08-14 15:33:35 +000030#include <linux/log2.h>
Robert Love42e9a922008-12-09 15:10:17 -080031
32#include <scsi/fc/fc_fc2.h>
33
34#include <scsi/libfc.h>
35#include <scsi/fc_encode.h>
36
Robert Love8866a5d2009-11-03 11:45:58 -080037#include "fc_libfc.h"
38
Vasu Deve4bc50b2009-08-25 13:58:47 -070039u16 fc_cpu_mask; /* cpu mask for possible cpus */
40EXPORT_SYMBOL(fc_cpu_mask);
41static u16 fc_cpu_order; /* 2's power to represent total possible cpus */
Robert Love3a3b42b2009-11-03 11:47:39 -080042static struct kmem_cache *fc_em_cachep; /* cache for exchanges */
Randy Dunlap55204902011-01-28 16:03:57 -080043static struct workqueue_struct *fc_exch_workqueue;
Robert Love42e9a922008-12-09 15:10:17 -080044
45/*
46 * Structure and function definitions for managing Fibre Channel Exchanges
47 * and Sequences.
48 *
49 * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
50 *
51 * fc_exch_mgr holds the exchange state for an N port
52 *
53 * fc_exch holds state for one exchange and links to its active sequence.
54 *
55 * fc_seq holds the state for an individual sequence.
56 */
57
Robert Love3a3b42b2009-11-03 11:47:39 -080058/**
59 * struct fc_exch_pool - Per cpu exchange pool
60 * @next_index: Next possible free exchange index
61 * @total_exches: Total allocated exchanges
62 * @lock: Exch pool lock
63 * @ex_list: List of exchanges
Vasu Deve4bc50b2009-08-25 13:58:47 -070064 *
65 * This structure manages per cpu exchanges in array of exchange pointers.
66 * This array is allocated followed by struct fc_exch_pool memory for
67 * assigned range of exchanges to per cpu pool.
68 */
69struct fc_exch_pool {
Vasu Deve17b4af2011-09-27 21:38:08 -070070 spinlock_t lock;
71 struct list_head ex_list;
Robert Love3a3b42b2009-11-03 11:47:39 -080072 u16 next_index;
73 u16 total_exches;
Hillf Danton2034c192010-11-30 16:18:17 -080074
75 /* two cache of free slot in exch array */
76 u16 left;
77 u16 right;
Vasu Deve17b4af2011-09-27 21:38:08 -070078} ____cacheline_aligned_in_smp;
Vasu Deve4bc50b2009-08-25 13:58:47 -070079
Robert Love3a3b42b2009-11-03 11:47:39 -080080/**
81 * struct fc_exch_mgr - The Exchange Manager (EM).
82 * @class: Default class for new sequences
83 * @kref: Reference counter
84 * @min_xid: Minimum exchange ID
85 * @max_xid: Maximum exchange ID
86 * @ep_pool: Reserved exchange pointers
87 * @pool_max_index: Max exch array index in exch pool
88 * @pool: Per cpu exch pool
89 * @stats: Statistics structure
Robert Love42e9a922008-12-09 15:10:17 -080090 *
91 * This structure is the center for creating exchanges and sequences.
92 * It manages the allocation of exchange IDs.
93 */
94struct fc_exch_mgr {
Bart Van Asschec6b21c92012-01-13 17:26:20 -080095 struct fc_exch_pool __percpu *pool;
Vasu Deve17b4af2011-09-27 21:38:08 -070096 mempool_t *ep_pool;
Robert Love3a3b42b2009-11-03 11:47:39 -080097 enum fc_class class;
98 struct kref kref;
99 u16 min_xid;
100 u16 max_xid;
Robert Love3a3b42b2009-11-03 11:47:39 -0800101 u16 pool_max_index;
Robert Love42e9a922008-12-09 15:10:17 -0800102
Robert Love42e9a922008-12-09 15:10:17 -0800103 struct {
104 atomic_t no_free_exch;
105 atomic_t no_free_exch_xid;
106 atomic_t xid_not_found;
107 atomic_t xid_busy;
108 atomic_t seq_not_found;
109 atomic_t non_bls_resp;
110 } stats;
Robert Love42e9a922008-12-09 15:10:17 -0800111};
Robert Love42e9a922008-12-09 15:10:17 -0800112
Robert Love3a3b42b2009-11-03 11:47:39 -0800113/**
114 * struct fc_exch_mgr_anchor - primary structure for list of EMs
115 * @ema_list: Exchange Manager Anchor list
116 * @mp: Exchange Manager associated with this anchor
117 * @match: Routine to determine if this anchor's EM should be used
118 *
119 * When walking the list of anchors the match routine will be called
120 * for each anchor to determine if that EM should be used. The last
121 * anchor in the list will always match to handle any exchanges not
122 * handled by other EMs. The non-default EMs would be added to the
Vasu Dev1bd49b42012-05-25 10:26:43 -0700123 * anchor list by HW that provides offloads.
Robert Love3a3b42b2009-11-03 11:47:39 -0800124 */
Vasu Dev96316092009-07-29 17:05:00 -0700125struct fc_exch_mgr_anchor {
126 struct list_head ema_list;
127 struct fc_exch_mgr *mp;
128 bool (*match)(struct fc_frame *);
129};
130
Robert Love42e9a922008-12-09 15:10:17 -0800131static void fc_exch_rrq(struct fc_exch *);
Joe Eykholt922611562010-07-20 15:21:12 -0700132static void fc_seq_ls_acc(struct fc_frame *);
133static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason,
Robert Love42e9a922008-12-09 15:10:17 -0800134 enum fc_els_rjt_explan);
Joe Eykholt922611562010-07-20 15:21:12 -0700135static void fc_exch_els_rec(struct fc_frame *);
136static void fc_exch_els_rrq(struct fc_frame *);
Robert Love42e9a922008-12-09 15:10:17 -0800137
138/*
139 * Internal implementation notes.
140 *
141 * The exchange manager is one by default in libfc but LLD may choose
142 * to have one per CPU. The sequence manager is one per exchange manager
143 * and currently never separated.
144 *
145 * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
146 * assigned by the Sequence Initiator that shall be unique for a specific
147 * D_ID and S_ID pair while the Sequence is open." Note that it isn't
148 * qualified by exchange ID, which one might think it would be.
149 * In practice this limits the number of open sequences and exchanges to 256
150 * per session. For most targets we could treat this limit as per exchange.
151 *
152 * The exchange and its sequence are freed when the last sequence is received.
153 * It's possible for the remote port to leave an exchange open without
154 * sending any sequences.
155 *
156 * Notes on reference counts:
157 *
158 * Exchanges are reference counted and exchange gets freed when the reference
159 * count becomes zero.
160 *
161 * Timeouts:
162 * Sequences are timed out for E_D_TOV and R_A_TOV.
163 *
164 * Sequence event handling:
165 *
166 * The following events may occur on initiator sequences:
167 *
168 * Send.
169 * For now, the whole thing is sent.
170 * Receive ACK
171 * This applies only to class F.
172 * The sequence is marked complete.
173 * ULP completion.
174 * The upper layer calls fc_exch_done() when done
175 * with exchange and sequence tuple.
176 * RX-inferred completion.
177 * When we receive the next sequence on the same exchange, we can
178 * retire the previous sequence ID. (XXX not implemented).
179 * Timeout.
180 * R_A_TOV frees the sequence ID. If we're waiting for ACK,
181 * E_D_TOV causes abort and calls upper layer response handler
182 * with FC_EX_TIMEOUT error.
183 * Receive RJT
184 * XXX defer.
185 * Send ABTS
186 * On timeout.
187 *
188 * The following events may occur on recipient sequences:
189 *
190 * Receive
191 * Allocate sequence for first frame received.
192 * Hold during receive handler.
193 * Release when final frame received.
194 * Keep status of last N of these for the ELS RES command. XXX TBD.
195 * Receive ABTS
196 * Deallocate sequence
197 * Send RJT
198 * Deallocate
199 *
200 * For now, we neglect conditions where only part of a sequence was
201 * received or transmitted, or where out-of-order receipt is detected.
202 */
203
204/*
205 * Locking notes:
206 *
207 * The EM code run in a per-CPU worker thread.
208 *
209 * To protect against concurrency between a worker thread code and timers,
210 * sequence allocation and deallocation must be locked.
211 * - exchange refcnt can be done atomicly without locks.
212 * - sequence allocation must be locked by exch lock.
Vasu Devb2f00912009-08-25 13:58:53 -0700213 * - If the EM pool lock and ex_lock must be taken at the same time, then the
214 * EM pool lock must be taken before the ex_lock.
Robert Love42e9a922008-12-09 15:10:17 -0800215 */
216
217/*
218 * opcode names for debugging.
219 */
220static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT;
221
Robert Love3a3b42b2009-11-03 11:47:39 -0800222/**
223 * fc_exch_name_lookup() - Lookup name by opcode
224 * @op: Opcode to be looked up
225 * @table: Opcode/name table
226 * @max_index: Index not to be exceeded
227 *
228 * This routine is used to determine a human-readable string identifying
229 * a R_CTL opcode.
230 */
Robert Love42e9a922008-12-09 15:10:17 -0800231static inline const char *fc_exch_name_lookup(unsigned int op, char **table,
232 unsigned int max_index)
233{
234 const char *name = NULL;
235
236 if (op < max_index)
237 name = table[op];
238 if (!name)
239 name = "unknown";
240 return name;
241}
242
Robert Love3a3b42b2009-11-03 11:47:39 -0800243/**
244 * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
245 * @op: The opcode to be looked up
246 */
Robert Love42e9a922008-12-09 15:10:17 -0800247static const char *fc_exch_rctl_name(unsigned int op)
248{
249 return fc_exch_name_lookup(op, fc_exch_rctl_names,
Kulikov Vasiliy7156fff2010-06-28 15:55:12 +0400250 ARRAY_SIZE(fc_exch_rctl_names));
Robert Love42e9a922008-12-09 15:10:17 -0800251}
252
Robert Love3a3b42b2009-11-03 11:47:39 -0800253/**
254 * fc_exch_hold() - Increment an exchange's reference count
255 * @ep: Echange to be held
Robert Love42e9a922008-12-09 15:10:17 -0800256 */
Robert Love3a3b42b2009-11-03 11:47:39 -0800257static inline void fc_exch_hold(struct fc_exch *ep)
Robert Love42e9a922008-12-09 15:10:17 -0800258{
259 atomic_inc(&ep->ex_refcnt);
260}
261
Robert Love3a3b42b2009-11-03 11:47:39 -0800262/**
263 * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
264 * and determine SOF and EOF.
265 * @ep: The exchange to that will use the header
266 * @fp: The frame whose header is to be modified
267 * @f_ctl: F_CTL bits that will be used for the frame header
268 *
269 * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
270 * fh_seq_id, fh_seq_cnt and the SOF and EOF.
Robert Love42e9a922008-12-09 15:10:17 -0800271 */
272static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp,
273 u32 f_ctl)
274{
275 struct fc_frame_header *fh = fc_frame_header_get(fp);
276 u16 fill;
277
278 fr_sof(fp) = ep->class;
279 if (ep->seq.cnt)
280 fr_sof(fp) = fc_sof_normal(ep->class);
281
282 if (f_ctl & FC_FC_END_SEQ) {
283 fr_eof(fp) = FC_EOF_T;
284 if (fc_sof_needs_ack(ep->class))
285 fr_eof(fp) = FC_EOF_N;
286 /*
Robert Love3a3b42b2009-11-03 11:47:39 -0800287 * From F_CTL.
Robert Love42e9a922008-12-09 15:10:17 -0800288 * The number of fill bytes to make the length a 4-byte
289 * multiple is the low order 2-bits of the f_ctl.
290 * The fill itself will have been cleared by the frame
291 * allocation.
292 * After this, the length will be even, as expected by
293 * the transport.
294 */
295 fill = fr_len(fp) & 3;
296 if (fill) {
297 fill = 4 - fill;
298 /* TODO, this may be a problem with fragmented skb */
299 skb_put(fp_skb(fp), fill);
300 hton24(fh->fh_f_ctl, f_ctl | fill);
301 }
302 } else {
303 WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */
304 fr_eof(fp) = FC_EOF_N;
305 }
306
Bart Van Asschec1d45422013-08-14 15:31:52 +0000307 /* Initialize remaining fh fields from fc_fill_fc_hdr */
Robert Love42e9a922008-12-09 15:10:17 -0800308 fh->fh_ox_id = htons(ep->oxid);
309 fh->fh_rx_id = htons(ep->rxid);
310 fh->fh_seq_id = ep->seq.id;
311 fh->fh_seq_cnt = htons(ep->seq.cnt);
312}
313
Robert Love3a3b42b2009-11-03 11:47:39 -0800314/**
315 * fc_exch_release() - Decrement an exchange's reference count
316 * @ep: Exchange to be released
317 *
318 * If the reference count reaches zero and the exchange is complete,
319 * it is freed.
Robert Love42e9a922008-12-09 15:10:17 -0800320 */
321static void fc_exch_release(struct fc_exch *ep)
322{
323 struct fc_exch_mgr *mp;
324
325 if (atomic_dec_and_test(&ep->ex_refcnt)) {
326 mp = ep->em;
327 if (ep->destructor)
328 ep->destructor(&ep->seq, ep->arg);
Julia Lawallaa6cd292009-02-04 22:17:29 +0100329 WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE));
Robert Love42e9a922008-12-09 15:10:17 -0800330 mempool_free(ep, mp->ep_pool);
331 }
332}
333
Robert Love3a3b42b2009-11-03 11:47:39 -0800334/**
Vasu Devb29a4f32012-07-06 10:40:10 -0700335 * fc_exch_timer_cancel() - cancel exch timer
336 * @ep: The exchange whose timer to be canceled
337 */
Robert Love4a80f082013-06-11 07:28:03 +0000338static inline void fc_exch_timer_cancel(struct fc_exch *ep)
Vasu Devb29a4f32012-07-06 10:40:10 -0700339{
340 if (cancel_delayed_work(&ep->timeout_work)) {
341 FC_EXCH_DBG(ep, "Exchange timer canceled\n");
342 atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
343 }
344}
345
346/**
347 * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
348 * the exchange lock held
349 * @ep: The exchange whose timer will start
350 * @timer_msec: The timeout period
351 *
352 * Used for upper level protocols to time out the exchange.
353 * The timer is cancelled when it fires or when the exchange completes.
354 */
355static inline void fc_exch_timer_set_locked(struct fc_exch *ep,
356 unsigned int timer_msec)
357{
358 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
359 return;
360
361 FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec);
362
Bart Van Asscheb8678862013-08-14 15:35:29 +0000363 fc_exch_hold(ep); /* hold for timer */
364 if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work,
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200365 msecs_to_jiffies(timer_msec))) {
366 FC_EXCH_DBG(ep, "Exchange already queued\n");
Bart Van Asscheb8678862013-08-14 15:35:29 +0000367 fc_exch_release(ep);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200368 }
Vasu Devb29a4f32012-07-06 10:40:10 -0700369}
370
371/**
372 * fc_exch_timer_set() - Lock the exchange and set the timer
373 * @ep: The exchange whose timer will start
374 * @timer_msec: The timeout period
375 */
376static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec)
377{
378 spin_lock_bh(&ep->ex_lock);
379 fc_exch_timer_set_locked(ep, timer_msec);
380 spin_unlock_bh(&ep->ex_lock);
381}
382
383/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800384 * fc_exch_done_locked() - Complete an exchange with the exchange lock held
385 * @ep: The exchange that is complete
Bart Van Assche7030fd62013-08-17 20:34:43 +0000386 *
387 * Note: May sleep if invoked from outside a response handler.
Robert Love3a3b42b2009-11-03 11:47:39 -0800388 */
Robert Love42e9a922008-12-09 15:10:17 -0800389static int fc_exch_done_locked(struct fc_exch *ep)
390{
391 int rc = 1;
392
393 /*
394 * We must check for completion in case there are two threads
395 * tyring to complete this. But the rrq code will reuse the
396 * ep, and in that case we only clear the resp and set it as
397 * complete, so it can be reused by the timer to send the rrq.
398 */
Robert Love42e9a922008-12-09 15:10:17 -0800399 if (ep->state & FC_EX_DONE)
400 return rc;
401 ep->esb_stat |= ESB_ST_COMPLETE;
402
403 if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
404 ep->state |= FC_EX_DONE;
Vasu Devb29a4f32012-07-06 10:40:10 -0700405 fc_exch_timer_cancel(ep);
Robert Love42e9a922008-12-09 15:10:17 -0800406 rc = 0;
407 }
408 return rc;
409}
410
Robert Love3a3b42b2009-11-03 11:47:39 -0800411/**
412 * fc_exch_ptr_get() - Return an exchange from an exchange pool
413 * @pool: Exchange Pool to get an exchange from
414 * @index: Index of the exchange within the pool
415 *
416 * Use the index to get an exchange from within an exchange pool. exches
417 * will point to an array of exchange pointers. The index will select
418 * the exchange within the array.
419 */
Vasu Deve4bc50b2009-08-25 13:58:47 -0700420static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool,
421 u16 index)
422{
423 struct fc_exch **exches = (struct fc_exch **)(pool + 1);
424 return exches[index];
425}
426
Robert Love3a3b42b2009-11-03 11:47:39 -0800427/**
428 * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
429 * @pool: The pool to assign the exchange to
430 * @index: The index in the pool where the exchange will be assigned
431 * @ep: The exchange to assign to the pool
432 */
Vasu Deve4bc50b2009-08-25 13:58:47 -0700433static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index,
434 struct fc_exch *ep)
435{
436 ((struct fc_exch **)(pool + 1))[index] = ep;
437}
438
Robert Love3a3b42b2009-11-03 11:47:39 -0800439/**
440 * fc_exch_delete() - Delete an exchange
441 * @ep: The exchange to be deleted
442 */
Vasu Devb2f00912009-08-25 13:58:53 -0700443static void fc_exch_delete(struct fc_exch *ep)
Robert Love42e9a922008-12-09 15:10:17 -0800444{
Vasu Devb2f00912009-08-25 13:58:53 -0700445 struct fc_exch_pool *pool;
Hillf Danton2034c192010-11-30 16:18:17 -0800446 u16 index;
Robert Love42e9a922008-12-09 15:10:17 -0800447
Vasu Devb2f00912009-08-25 13:58:53 -0700448 pool = ep->pool;
449 spin_lock_bh(&pool->lock);
450 WARN_ON(pool->total_exches <= 0);
451 pool->total_exches--;
Hillf Danton2034c192010-11-30 16:18:17 -0800452
453 /* update cache of free slot */
454 index = (ep->xid - ep->em->min_xid) >> fc_cpu_order;
455 if (pool->left == FC_XID_UNKNOWN)
456 pool->left = index;
457 else if (pool->right == FC_XID_UNKNOWN)
458 pool->right = index;
459 else
460 pool->next_index = index;
461
462 fc_exch_ptr_set(pool, index, NULL);
Robert Love42e9a922008-12-09 15:10:17 -0800463 list_del(&ep->ex_list);
Vasu Devb2f00912009-08-25 13:58:53 -0700464 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800465 fc_exch_release(ep); /* drop hold for exch in mp */
466}
467
Neil Hormanfb00cc22013-05-03 19:34:15 +0000468static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp,
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000469 struct fc_frame *fp)
Robert Love1a7b75a2009-11-03 11:45:47 -0800470{
471 struct fc_exch *ep;
472 struct fc_frame_header *fh = fc_frame_header_get(fp);
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000473 int error = -ENXIO;
Robert Love3a3b42b2009-11-03 11:47:39 -0800474 u32 f_ctl;
Vasu Dev14fc3152011-10-28 11:34:12 -0700475 u8 fh_type = fh->fh_type;
Robert Love1a7b75a2009-11-03 11:45:47 -0800476
477 ep = fc_seq_exch(sp);
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000478
479 if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) {
480 fc_frame_free(fp);
481 goto out;
482 }
483
Neil Hormanfb00cc22013-05-03 19:34:15 +0000484 WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT));
Robert Love1a7b75a2009-11-03 11:45:47 -0800485
486 f_ctl = ntoh24(fh->fh_f_ctl);
487 fc_exch_setup_hdr(ep, fp, f_ctl);
Joe Eykholtf60e12e2010-07-20 15:20:14 -0700488 fr_encaps(fp) = ep->encaps;
Robert Love1a7b75a2009-11-03 11:45:47 -0800489
490 /*
491 * update sequence count if this frame is carrying
492 * multiple FC frames when sequence offload is enabled
493 * by LLD.
494 */
495 if (fr_max_payload(fp))
496 sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)),
497 fr_max_payload(fp));
498 else
499 sp->cnt++;
500
501 /*
502 * Send the frame.
503 */
Robert Love3a3b42b2009-11-03 11:47:39 -0800504 error = lport->tt.frame_send(lport, fp);
Robert Love1a7b75a2009-11-03 11:45:47 -0800505
Vasu Dev14fc3152011-10-28 11:34:12 -0700506 if (fh_type == FC_TYPE_BLS)
Neil Hormanfb00cc22013-05-03 19:34:15 +0000507 goto out;
Vasu Dev77a2b732011-08-25 12:40:52 -0700508
Robert Love1a7b75a2009-11-03 11:45:47 -0800509 /*
510 * Update the exchange and sequence flags,
511 * assuming all frames for the sequence have been sent.
512 * We can only be called to send once for each sequence.
513 */
Robert Love1a7b75a2009-11-03 11:45:47 -0800514 ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */
Joe Eykholtcc3593d2010-03-12 16:08:29 -0800515 if (f_ctl & FC_FC_SEQ_INIT)
Robert Love1a7b75a2009-11-03 11:45:47 -0800516 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
Neil Hormanfb00cc22013-05-03 19:34:15 +0000517out:
518 return error;
519}
520
521/**
522 * fc_seq_send() - Send a frame using existing sequence/exchange pair
523 * @lport: The local port that the exchange will be sent on
524 * @sp: The sequence to be sent
525 * @fp: The frame to be sent on the exchange
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000526 *
527 * Note: The frame will be freed either by a direct call to fc_frame_free(fp)
528 * or indirectly by calling libfc_function_template.frame_send().
Neil Hormanfb00cc22013-05-03 19:34:15 +0000529 */
530static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp,
531 struct fc_frame *fp)
532{
533 struct fc_exch *ep;
534 int error;
535 ep = fc_seq_exch(sp);
536 spin_lock_bh(&ep->ex_lock);
537 error = fc_seq_send_locked(lport, sp, fp);
Robert Love1a7b75a2009-11-03 11:45:47 -0800538 spin_unlock_bh(&ep->ex_lock);
539 return error;
540}
541
542/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800543 * fc_seq_alloc() - Allocate a sequence for a given exchange
544 * @ep: The exchange to allocate a new sequence for
545 * @seq_id: The sequence ID to be used
Robert Love1a7b75a2009-11-03 11:45:47 -0800546 *
547 * We don't support multiple originated sequences on the same exchange.
548 * By implication, any previously originated sequence on this exchange
549 * is complete, and we reallocate the same sequence.
550 */
551static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id)
552{
553 struct fc_seq *sp;
554
555 sp = &ep->seq;
556 sp->ssb_stat = 0;
557 sp->cnt = 0;
558 sp->id = seq_id;
559 return sp;
560}
561
Robert Love3a3b42b2009-11-03 11:47:39 -0800562/**
563 * fc_seq_start_next_locked() - Allocate a new sequence on the same
564 * exchange as the supplied sequence
565 * @sp: The sequence/exchange to get a new sequence for
566 */
Robert Love1a7b75a2009-11-03 11:45:47 -0800567static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp)
568{
569 struct fc_exch *ep = fc_seq_exch(sp);
570
571 sp = fc_seq_alloc(ep, ep->seq_id++);
572 FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n",
573 ep->f_ctl, sp->id);
574 return sp;
575}
576
577/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800578 * fc_seq_start_next() - Lock the exchange and get a new sequence
579 * for a given sequence/exchange pair
580 * @sp: The sequence/exchange to get a new exchange for
Robert Love1a7b75a2009-11-03 11:45:47 -0800581 */
582static struct fc_seq *fc_seq_start_next(struct fc_seq *sp)
583{
584 struct fc_exch *ep = fc_seq_exch(sp);
585
586 spin_lock_bh(&ep->ex_lock);
587 sp = fc_seq_start_next_locked(sp);
588 spin_unlock_bh(&ep->ex_lock);
589
590 return sp;
591}
592
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800593/*
594 * Set the response handler for the exchange associated with a sequence.
Bart Van Assche7030fd62013-08-17 20:34:43 +0000595 *
596 * Note: May sleep if invoked from outside a response handler.
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800597 */
598static void fc_seq_set_resp(struct fc_seq *sp,
599 void (*resp)(struct fc_seq *, struct fc_frame *,
600 void *),
601 void *arg)
602{
603 struct fc_exch *ep = fc_seq_exch(sp);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000604 DEFINE_WAIT(wait);
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800605
606 spin_lock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000607 while (ep->resp_active && ep->resp_task != current) {
608 prepare_to_wait(&ep->resp_wq, &wait, TASK_UNINTERRUPTIBLE);
609 spin_unlock_bh(&ep->ex_lock);
610
611 schedule();
612
613 spin_lock_bh(&ep->ex_lock);
614 }
615 finish_wait(&ep->resp_wq, &wait);
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800616 ep->resp = resp;
617 ep->arg = arg;
618 spin_unlock_bh(&ep->ex_lock);
619}
620
Robert Love1a7b75a2009-11-03 11:45:47 -0800621/**
Vasu Dev77a2b732011-08-25 12:40:52 -0700622 * fc_exch_abort_locked() - Abort an exchange
623 * @ep: The exchange to be aborted
Robert Love3a3b42b2009-11-03 11:47:39 -0800624 * @timer_msec: The period of time to wait before aborting
625 *
Vasu Dev77a2b732011-08-25 12:40:52 -0700626 * Locking notes: Called with exch lock held
627 *
628 * Return value: 0 on success else error code
Robert Love1a7b75a2009-11-03 11:45:47 -0800629 */
Vasu Dev77a2b732011-08-25 12:40:52 -0700630static int fc_exch_abort_locked(struct fc_exch *ep,
631 unsigned int timer_msec)
Robert Love42e9a922008-12-09 15:10:17 -0800632{
633 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -0800634 struct fc_frame *fp;
635 int error;
636
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200637 FC_EXCH_DBG(ep, "exch: abort, time %d msecs\n", timer_msec);
Robert Love42e9a922008-12-09 15:10:17 -0800638 if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) ||
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200639 ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) {
640 FC_EXCH_DBG(ep, "exch: already completed esb %x state %x\n",
641 ep->esb_stat, ep->state);
Robert Love42e9a922008-12-09 15:10:17 -0800642 return -ENXIO;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200643 }
Robert Love42e9a922008-12-09 15:10:17 -0800644
645 /*
646 * Send the abort on a new sequence if possible.
647 */
648 sp = fc_seq_start_next_locked(&ep->seq);
Vasu Dev77a2b732011-08-25 12:40:52 -0700649 if (!sp)
Robert Love42e9a922008-12-09 15:10:17 -0800650 return -ENOMEM;
Robert Love42e9a922008-12-09 15:10:17 -0800651
Robert Love42e9a922008-12-09 15:10:17 -0800652 if (timer_msec)
653 fc_exch_timer_set_locked(ep, timer_msec);
Robert Love42e9a922008-12-09 15:10:17 -0800654
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000655 if (ep->sid) {
656 /*
657 * Send an abort for the sequence that timed out.
658 */
659 fp = fc_frame_alloc(ep->lp, 0);
660 if (fp) {
661 ep->esb_stat |= ESB_ST_SEQ_INIT;
662 fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
663 FC_TYPE_BLS, FC_FC_END_SEQ |
664 FC_FC_SEQ_INIT, 0);
665 error = fc_seq_send_locked(ep->lp, sp, fp);
666 } else {
667 error = -ENOBUFS;
668 }
669 } else {
670 /*
671 * If not logged into the fabric, don't send ABTS but leave
672 * sequence active until next timeout.
673 */
674 error = 0;
675 }
676 ep->esb_stat |= ESB_ST_ABNORMAL;
Robert Love42e9a922008-12-09 15:10:17 -0800677 return error;
678}
Robert Love42e9a922008-12-09 15:10:17 -0800679
Robert Love3a3b42b2009-11-03 11:47:39 -0800680/**
Vasu Dev77a2b732011-08-25 12:40:52 -0700681 * fc_seq_exch_abort() - Abort an exchange and sequence
682 * @req_sp: The sequence to be aborted
683 * @timer_msec: The period of time to wait before aborting
684 *
685 * Generally called because of a timeout or an abort from the upper layer.
686 *
687 * Return value: 0 on success else error code
688 */
689static int fc_seq_exch_abort(const struct fc_seq *req_sp,
690 unsigned int timer_msec)
691{
692 struct fc_exch *ep;
693 int error;
694
695 ep = fc_seq_exch(req_sp);
696 spin_lock_bh(&ep->ex_lock);
697 error = fc_exch_abort_locked(ep, timer_msec);
698 spin_unlock_bh(&ep->ex_lock);
699 return error;
700}
701
702/**
Bart Van Assche7030fd62013-08-17 20:34:43 +0000703 * fc_invoke_resp() - invoke ep->resp()
704 *
705 * Notes:
706 * It is assumed that after initialization finished (this means the
707 * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are
708 * modified only via fc_seq_set_resp(). This guarantees that none of these
709 * two variables changes if ep->resp_active > 0.
710 *
711 * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when
712 * this function is invoked, the first spin_lock_bh() call in this function
713 * will wait until fc_seq_set_resp() has finished modifying these variables.
714 *
715 * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that
716 * ep->resp() won't be invoked after fc_exch_done() has returned.
717 *
718 * The response handler itself may invoke fc_exch_done(), which will clear the
719 * ep->resp pointer.
720 *
721 * Return value:
722 * Returns true if and only if ep->resp has been invoked.
723 */
724static bool fc_invoke_resp(struct fc_exch *ep, struct fc_seq *sp,
725 struct fc_frame *fp)
726{
727 void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
728 void *arg;
729 bool res = false;
730
731 spin_lock_bh(&ep->ex_lock);
732 ep->resp_active++;
733 if (ep->resp_task != current)
734 ep->resp_task = !ep->resp_task ? current : NULL;
735 resp = ep->resp;
736 arg = ep->arg;
737 spin_unlock_bh(&ep->ex_lock);
738
739 if (resp) {
740 resp(sp, fp, arg);
741 res = true;
Bart Van Assche7030fd62013-08-17 20:34:43 +0000742 }
743
744 spin_lock_bh(&ep->ex_lock);
745 if (--ep->resp_active == 0)
746 ep->resp_task = NULL;
747 spin_unlock_bh(&ep->ex_lock);
748
749 if (ep->resp_active == 0)
750 wake_up(&ep->resp_wq);
751
752 return res;
753}
754
755/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800756 * fc_exch_timeout() - Handle exchange timer expiration
757 * @work: The work_struct identifying the exchange that timed out
Robert Love42e9a922008-12-09 15:10:17 -0800758 */
759static void fc_exch_timeout(struct work_struct *work)
760{
761 struct fc_exch *ep = container_of(work, struct fc_exch,
762 timeout_work.work);
763 struct fc_seq *sp = &ep->seq;
Robert Love42e9a922008-12-09 15:10:17 -0800764 u32 e_stat;
765 int rc = 1;
766
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200767 FC_EXCH_DBG(ep, "Exchange timed out state %x\n", ep->state);
Robert Lovecd305ce2009-08-25 13:58:37 -0700768
Robert Love42e9a922008-12-09 15:10:17 -0800769 spin_lock_bh(&ep->ex_lock);
770 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
771 goto unlock;
772
773 e_stat = ep->esb_stat;
774 if (e_stat & ESB_ST_COMPLETE) {
775 ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL;
Vasu Deva0cc1ec2009-07-28 17:33:37 -0700776 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -0800777 if (e_stat & ESB_ST_REC_QUAL)
778 fc_exch_rrq(ep);
Robert Love42e9a922008-12-09 15:10:17 -0800779 goto done;
780 } else {
Robert Love42e9a922008-12-09 15:10:17 -0800781 if (e_stat & ESB_ST_ABNORMAL)
782 rc = fc_exch_done_locked(ep);
783 spin_unlock_bh(&ep->ex_lock);
Parikh, Neeravf3162482011-02-25 15:02:56 -0800784 if (!rc)
785 fc_exch_delete(ep);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000786 fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_TIMEOUT));
787 fc_seq_set_resp(sp, NULL, ep->arg);
Robert Love42e9a922008-12-09 15:10:17 -0800788 fc_seq_exch_abort(sp, 2 * ep->r_a_tov);
789 goto done;
790 }
791unlock:
792 spin_unlock_bh(&ep->ex_lock);
793done:
794 /*
795 * This release matches the hold taken when the timer was set.
796 */
797 fc_exch_release(ep);
798}
799
Vasu Dev52ff8782009-07-29 17:05:10 -0700800/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800801 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
802 * @lport: The local port that the exchange is for
803 * @mp: The exchange manager that will allocate the exchange
Robert Love42e9a922008-12-09 15:10:17 -0800804 *
Vasu Devd7179682009-07-29 17:05:21 -0700805 * Returns pointer to allocated fc_exch with exch lock held.
Robert Love42e9a922008-12-09 15:10:17 -0800806 */
Vasu Dev52ff8782009-07-29 17:05:10 -0700807static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport,
Vasu Devd7179682009-07-29 17:05:21 -0700808 struct fc_exch_mgr *mp)
Robert Love42e9a922008-12-09 15:10:17 -0800809{
810 struct fc_exch *ep;
Vasu Devb2f00912009-08-25 13:58:53 -0700811 unsigned int cpu;
812 u16 index;
813 struct fc_exch_pool *pool;
Robert Love42e9a922008-12-09 15:10:17 -0800814
815 /* allocate memory for exchange */
816 ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC);
817 if (!ep) {
818 atomic_inc(&mp->stats.no_free_exch);
819 goto out;
820 }
821 memset(ep, 0, sizeof(*ep));
822
Joe Eykholtf018b732010-03-12 16:08:55 -0800823 cpu = get_cpu();
Vasu Devb2f00912009-08-25 13:58:53 -0700824 pool = per_cpu_ptr(mp->pool, cpu);
825 spin_lock_bh(&pool->lock);
Joe Eykholtf018b732010-03-12 16:08:55 -0800826 put_cpu();
Hillf Danton2034c192010-11-30 16:18:17 -0800827
828 /* peek cache of free slot */
829 if (pool->left != FC_XID_UNKNOWN) {
Hannes Reineckeb73aa562016-10-13 15:10:49 +0200830 if (!WARN_ON(fc_exch_ptr_get(pool, pool->left))) {
831 index = pool->left;
832 pool->left = FC_XID_UNKNOWN;
833 goto hit;
834 }
Hillf Danton2034c192010-11-30 16:18:17 -0800835 }
836 if (pool->right != FC_XID_UNKNOWN) {
Hannes Reineckeb73aa562016-10-13 15:10:49 +0200837 if (!WARN_ON(fc_exch_ptr_get(pool, pool->right))) {
838 index = pool->right;
839 pool->right = FC_XID_UNKNOWN;
840 goto hit;
841 }
Hillf Danton2034c192010-11-30 16:18:17 -0800842 }
843
Vasu Devb2f00912009-08-25 13:58:53 -0700844 index = pool->next_index;
845 /* allocate new exch from pool */
846 while (fc_exch_ptr_get(pool, index)) {
847 index = index == mp->pool_max_index ? 0 : index + 1;
848 if (index == pool->next_index)
Robert Love42e9a922008-12-09 15:10:17 -0800849 goto err;
Robert Love42e9a922008-12-09 15:10:17 -0800850 }
Vasu Devb2f00912009-08-25 13:58:53 -0700851 pool->next_index = index == mp->pool_max_index ? 0 : index + 1;
Hillf Danton2034c192010-11-30 16:18:17 -0800852hit:
Robert Love42e9a922008-12-09 15:10:17 -0800853 fc_exch_hold(ep); /* hold for exch in mp */
854 spin_lock_init(&ep->ex_lock);
855 /*
856 * Hold exch lock for caller to prevent fc_exch_reset()
857 * from releasing exch while fc_exch_alloc() caller is
858 * still working on exch.
859 */
860 spin_lock_bh(&ep->ex_lock);
861
Vasu Devb2f00912009-08-25 13:58:53 -0700862 fc_exch_ptr_set(pool, index, ep);
863 list_add_tail(&ep->ex_list, &pool->ex_list);
Robert Love42e9a922008-12-09 15:10:17 -0800864 fc_seq_alloc(ep, ep->seq_id++);
Vasu Devb2f00912009-08-25 13:58:53 -0700865 pool->total_exches++;
866 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800867
868 /*
869 * update exchange
870 */
Vasu Devb2f00912009-08-25 13:58:53 -0700871 ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid;
Robert Love42e9a922008-12-09 15:10:17 -0800872 ep->em = mp;
Vasu Devb2f00912009-08-25 13:58:53 -0700873 ep->pool = pool;
Vasu Dev52ff8782009-07-29 17:05:10 -0700874 ep->lp = lport;
Robert Love42e9a922008-12-09 15:10:17 -0800875 ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */
876 ep->rxid = FC_XID_UNKNOWN;
877 ep->class = mp->class;
Bart Van Assche7030fd62013-08-17 20:34:43 +0000878 ep->resp_active = 0;
879 init_waitqueue_head(&ep->resp_wq);
Robert Love42e9a922008-12-09 15:10:17 -0800880 INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout);
881out:
882 return ep;
883err:
Vasu Devb2f00912009-08-25 13:58:53 -0700884 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800885 atomic_inc(&mp->stats.no_free_exch_xid);
886 mempool_free(ep, mp->ep_pool);
887 return NULL;
888}
Vasu Dev52ff8782009-07-29 17:05:10 -0700889
890/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800891 * fc_exch_alloc() - Allocate an exchange from an EM on a
892 * local port's list of EMs.
893 * @lport: The local port that will own the exchange
894 * @fp: The FC frame that the exchange will be for
Vasu Dev52ff8782009-07-29 17:05:10 -0700895 *
Robert Love3a3b42b2009-11-03 11:47:39 -0800896 * This function walks the list of exchange manager(EM)
897 * anchors to select an EM for a new exchange allocation. The
898 * EM is selected when a NULL match function pointer is encountered
899 * or when a call to a match function returns true.
Vasu Dev52ff8782009-07-29 17:05:10 -0700900 */
Martin K. Petersenf8f91f32016-10-14 16:37:29 -0400901static struct fc_exch *fc_exch_alloc(struct fc_lport *lport,
902 struct fc_frame *fp)
Vasu Dev52ff8782009-07-29 17:05:10 -0700903{
904 struct fc_exch_mgr_anchor *ema;
Martin K. Petersenf8f91f32016-10-14 16:37:29 -0400905 struct fc_exch *ep;
Vasu Dev52ff8782009-07-29 17:05:10 -0700906
Martin K. Petersenf8f91f32016-10-14 16:37:29 -0400907 list_for_each_entry(ema, &lport->ema_list, ema_list) {
908 if (!ema->match || ema->match(fp)) {
909 ep = fc_exch_em_alloc(lport, ema->mp);
910 if (ep)
911 return ep;
912 }
913 }
Vasu Dev52ff8782009-07-29 17:05:10 -0700914 return NULL;
915}
Robert Love42e9a922008-12-09 15:10:17 -0800916
Robert Love3a3b42b2009-11-03 11:47:39 -0800917/**
918 * fc_exch_find() - Lookup and hold an exchange
919 * @mp: The exchange manager to lookup the exchange from
920 * @xid: The XID of the exchange to look up
Robert Love42e9a922008-12-09 15:10:17 -0800921 */
922static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid)
923{
Vasu Devb2f00912009-08-25 13:58:53 -0700924 struct fc_exch_pool *pool;
Robert Love42e9a922008-12-09 15:10:17 -0800925 struct fc_exch *ep = NULL;
Chris Leechfa068832016-06-30 08:32:36 -0700926 u16 cpu = xid & fc_cpu_mask;
927
928 if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
929 printk_ratelimited(KERN_ERR
930 "libfc: lookup request for XID = %d, "
931 "indicates invalid CPU %d\n", xid, cpu);
932 return NULL;
933 }
Robert Love42e9a922008-12-09 15:10:17 -0800934
935 if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) {
Chris Leechfa068832016-06-30 08:32:36 -0700936 pool = per_cpu_ptr(mp->pool, cpu);
Vasu Devb2f00912009-08-25 13:58:53 -0700937 spin_lock_bh(&pool->lock);
938 ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order);
Bart Van Assche8d080232013-08-17 20:20:07 +0000939 if (ep) {
940 WARN_ON(ep->xid != xid);
Robert Love42e9a922008-12-09 15:10:17 -0800941 fc_exch_hold(ep);
Bart Van Assche8d080232013-08-17 20:20:07 +0000942 }
Vasu Devb2f00912009-08-25 13:58:53 -0700943 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800944 }
945 return ep;
946}
947
Robert Love1a7b75a2009-11-03 11:45:47 -0800948
949/**
950 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
Robert Love3a3b42b2009-11-03 11:47:39 -0800951 * the memory allocated for the related objects may be freed.
952 * @sp: The sequence that has completed
Bart Van Assche7030fd62013-08-17 20:34:43 +0000953 *
954 * Note: May sleep if invoked from outside a response handler.
Robert Love1a7b75a2009-11-03 11:45:47 -0800955 */
956static void fc_exch_done(struct fc_seq *sp)
Robert Love42e9a922008-12-09 15:10:17 -0800957{
958 struct fc_exch *ep = fc_seq_exch(sp);
959 int rc;
960
961 spin_lock_bh(&ep->ex_lock);
962 rc = fc_exch_done_locked(ep);
963 spin_unlock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000964
965 fc_seq_set_resp(sp, NULL, ep->arg);
Robert Love42e9a922008-12-09 15:10:17 -0800966 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -0700967 fc_exch_delete(ep);
Robert Love42e9a922008-12-09 15:10:17 -0800968}
Robert Love42e9a922008-12-09 15:10:17 -0800969
Robert Love3a3b42b2009-11-03 11:47:39 -0800970/**
971 * fc_exch_resp() - Allocate a new exchange for a response frame
972 * @lport: The local port that the exchange was for
973 * @mp: The exchange manager to allocate the exchange from
974 * @fp: The response frame
975 *
Robert Love42e9a922008-12-09 15:10:17 -0800976 * Sets the responder ID in the frame header.
977 */
Vasu Dev52ff8782009-07-29 17:05:10 -0700978static struct fc_exch *fc_exch_resp(struct fc_lport *lport,
979 struct fc_exch_mgr *mp,
980 struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -0800981{
982 struct fc_exch *ep;
983 struct fc_frame_header *fh;
Robert Love42e9a922008-12-09 15:10:17 -0800984
Vasu Dev52ff8782009-07-29 17:05:10 -0700985 ep = fc_exch_alloc(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -0800986 if (ep) {
987 ep->class = fc_frame_class(fp);
988
989 /*
990 * Set EX_CTX indicating we're responding on this exchange.
991 */
992 ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */
993 ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */
994 fh = fc_frame_header_get(fp);
995 ep->sid = ntoh24(fh->fh_d_id);
996 ep->did = ntoh24(fh->fh_s_id);
997 ep->oid = ep->did;
998
999 /*
1000 * Allocated exchange has placed the XID in the
1001 * originator field. Move it to the responder field,
1002 * and set the originator XID from the frame.
1003 */
1004 ep->rxid = ep->xid;
1005 ep->oxid = ntohs(fh->fh_ox_id);
1006 ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT;
1007 if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0)
1008 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
1009
Robert Love42e9a922008-12-09 15:10:17 -08001010 fc_exch_hold(ep); /* hold for caller */
Vasu Dev52ff8782009-07-29 17:05:10 -07001011 spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */
Robert Love42e9a922008-12-09 15:10:17 -08001012 }
1013 return ep;
1014}
1015
Robert Love3a3b42b2009-11-03 11:47:39 -08001016/**
1017 * fc_seq_lookup_recip() - Find a sequence where the other end
1018 * originated the sequence
1019 * @lport: The local port that the frame was sent to
1020 * @mp: The Exchange Manager to lookup the exchange from
1021 * @fp: The frame associated with the sequence we're looking for
1022 *
Robert Love42e9a922008-12-09 15:10:17 -08001023 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
1024 * on the ep that should be released by the caller.
1025 */
Vasu Dev52ff8782009-07-29 17:05:10 -07001026static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport,
1027 struct fc_exch_mgr *mp,
Robert Loveb2ab99c2009-02-27 10:55:50 -08001028 struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -08001029{
1030 struct fc_frame_header *fh = fc_frame_header_get(fp);
1031 struct fc_exch *ep = NULL;
1032 struct fc_seq *sp = NULL;
1033 enum fc_pf_rjt_reason reject = FC_RJT_NONE;
1034 u32 f_ctl;
1035 u16 xid;
1036
1037 f_ctl = ntoh24(fh->fh_f_ctl);
1038 WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0);
1039
1040 /*
1041 * Lookup or create the exchange if we will be creating the sequence.
1042 */
1043 if (f_ctl & FC_FC_EX_CTX) {
1044 xid = ntohs(fh->fh_ox_id); /* we originated exch */
1045 ep = fc_exch_find(mp, xid);
1046 if (!ep) {
1047 atomic_inc(&mp->stats.xid_not_found);
1048 reject = FC_RJT_OX_ID;
1049 goto out;
1050 }
1051 if (ep->rxid == FC_XID_UNKNOWN)
1052 ep->rxid = ntohs(fh->fh_rx_id);
1053 else if (ep->rxid != ntohs(fh->fh_rx_id)) {
1054 reject = FC_RJT_OX_ID;
1055 goto rel;
1056 }
1057 } else {
1058 xid = ntohs(fh->fh_rx_id); /* we are the responder */
1059
1060 /*
1061 * Special case for MDS issuing an ELS TEST with a
1062 * bad rxid of 0.
1063 * XXX take this out once we do the proper reject.
1064 */
1065 if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ &&
1066 fc_frame_payload_op(fp) == ELS_TEST) {
1067 fh->fh_rx_id = htons(FC_XID_UNKNOWN);
1068 xid = FC_XID_UNKNOWN;
1069 }
1070
1071 /*
1072 * new sequence - find the exchange
1073 */
1074 ep = fc_exch_find(mp, xid);
1075 if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) {
1076 if (ep) {
1077 atomic_inc(&mp->stats.xid_busy);
1078 reject = FC_RJT_RX_ID;
1079 goto rel;
1080 }
Vasu Dev52ff8782009-07-29 17:05:10 -07001081 ep = fc_exch_resp(lport, mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001082 if (!ep) {
1083 reject = FC_RJT_EXCH_EST; /* XXX */
1084 goto out;
1085 }
1086 xid = ep->xid; /* get our XID */
1087 } else if (!ep) {
1088 atomic_inc(&mp->stats.xid_not_found);
1089 reject = FC_RJT_RX_ID; /* XID not found */
1090 goto out;
1091 }
1092 }
1093
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001094 spin_lock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001095 /*
1096 * At this point, we have the exchange held.
1097 * Find or create the sequence.
1098 */
1099 if (fc_sof_is_init(fr_sof(fp))) {
Vasu Deva104c842010-03-12 16:08:34 -08001100 sp = &ep->seq;
Robert Love42e9a922008-12-09 15:10:17 -08001101 sp->ssb_stat |= SSB_ST_RESP;
Joe Eykholtb3667f92010-05-07 15:18:13 -07001102 sp->id = fh->fh_seq_id;
Robert Love42e9a922008-12-09 15:10:17 -08001103 } else {
1104 sp = &ep->seq;
1105 if (sp->id != fh->fh_seq_id) {
1106 atomic_inc(&mp->stats.seq_not_found);
Kiran Patile3e65c62011-06-20 16:59:30 -07001107 if (f_ctl & FC_FC_END_SEQ) {
1108 /*
1109 * Update sequence_id based on incoming last
1110 * frame of sequence exchange. This is needed
Vasu Dev1bd49b42012-05-25 10:26:43 -07001111 * for FC target where DDP has been used
Kiran Patile3e65c62011-06-20 16:59:30 -07001112 * on target where, stack is indicated only
1113 * about last frame's (payload _header) header.
1114 * Whereas "seq_id" which is part of
1115 * frame_header is allocated by initiator
1116 * which is totally different from "seq_id"
1117 * allocated when XFER_RDY was sent by target.
1118 * To avoid false -ve which results into not
1119 * sending RSP, hence write request on other
1120 * end never finishes.
1121 */
Kiran Patile3e65c62011-06-20 16:59:30 -07001122 sp->ssb_stat |= SSB_ST_RESP;
1123 sp->id = fh->fh_seq_id;
Kiran Patile3e65c62011-06-20 16:59:30 -07001124 } else {
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001125 spin_unlock_bh(&ep->ex_lock);
1126
Kiran Patile3e65c62011-06-20 16:59:30 -07001127 /* sequence/exch should exist */
1128 reject = FC_RJT_SEQ_ID;
1129 goto rel;
1130 }
Robert Love42e9a922008-12-09 15:10:17 -08001131 }
1132 }
1133 WARN_ON(ep != fc_seq_exch(sp));
1134
1135 if (f_ctl & FC_FC_SEQ_INIT)
1136 ep->esb_stat |= ESB_ST_SEQ_INIT;
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001137 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001138
1139 fr_seq(fp) = sp;
1140out:
1141 return reject;
1142rel:
1143 fc_exch_done(&ep->seq);
1144 fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */
1145 return reject;
1146}
1147
Robert Love3a3b42b2009-11-03 11:47:39 -08001148/**
1149 * fc_seq_lookup_orig() - Find a sequence where this end
1150 * originated the sequence
1151 * @mp: The Exchange Manager to lookup the exchange from
1152 * @fp: The frame associated with the sequence we're looking for
1153 *
Robert Love42e9a922008-12-09 15:10:17 -08001154 * Does not hold the sequence for the caller.
1155 */
1156static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp,
1157 struct fc_frame *fp)
1158{
1159 struct fc_frame_header *fh = fc_frame_header_get(fp);
1160 struct fc_exch *ep;
1161 struct fc_seq *sp = NULL;
1162 u32 f_ctl;
1163 u16 xid;
1164
1165 f_ctl = ntoh24(fh->fh_f_ctl);
1166 WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX);
1167 xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id);
1168 ep = fc_exch_find(mp, xid);
1169 if (!ep)
1170 return NULL;
1171 if (ep->seq.id == fh->fh_seq_id) {
1172 /*
1173 * Save the RX_ID if we didn't previously know it.
1174 */
1175 sp = &ep->seq;
1176 if ((f_ctl & FC_FC_EX_CTX) != 0 &&
1177 ep->rxid == FC_XID_UNKNOWN) {
1178 ep->rxid = ntohs(fh->fh_rx_id);
1179 }
1180 }
1181 fc_exch_release(ep);
1182 return sp;
1183}
1184
Robert Love3a3b42b2009-11-03 11:47:39 -08001185/**
1186 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
1187 * @ep: The exchange to set the addresses for
1188 * @orig_id: The originator's ID
1189 * @resp_id: The responder's ID
1190 *
Robert Love42e9a922008-12-09 15:10:17 -08001191 * Note this must be done before the first sequence of the exchange is sent.
1192 */
1193static void fc_exch_set_addr(struct fc_exch *ep,
1194 u32 orig_id, u32 resp_id)
1195{
1196 ep->oid = orig_id;
1197 if (ep->esb_stat & ESB_ST_RESP) {
1198 ep->sid = resp_id;
1199 ep->did = orig_id;
1200 } else {
1201 ep->sid = orig_id;
1202 ep->did = resp_id;
1203 }
1204}
1205
Robert Love1a7b75a2009-11-03 11:45:47 -08001206/**
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001207 * fc_seq_els_rsp_send() - Send an ELS response using information from
Robert Love3a3b42b2009-11-03 11:47:39 -08001208 * the existing sequence/exchange.
Joe Eykholt922611562010-07-20 15:21:12 -07001209 * @fp: The received frame
Robert Love3a3b42b2009-11-03 11:47:39 -08001210 * @els_cmd: The ELS command to be sent
1211 * @els_data: The ELS data to be sent
Joe Eykholt922611562010-07-20 15:21:12 -07001212 *
1213 * The received frame is not freed.
Robert Love42e9a922008-12-09 15:10:17 -08001214 */
Joe Eykholt922611562010-07-20 15:21:12 -07001215static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd,
Robert Love1a7b75a2009-11-03 11:45:47 -08001216 struct fc_seq_els_data *els_data)
Robert Love42e9a922008-12-09 15:10:17 -08001217{
1218 switch (els_cmd) {
1219 case ELS_LS_RJT:
Joe Eykholt922611562010-07-20 15:21:12 -07001220 fc_seq_ls_rjt(fp, els_data->reason, els_data->explan);
Robert Love42e9a922008-12-09 15:10:17 -08001221 break;
1222 case ELS_LS_ACC:
Joe Eykholt922611562010-07-20 15:21:12 -07001223 fc_seq_ls_acc(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001224 break;
1225 case ELS_RRQ:
Joe Eykholt922611562010-07-20 15:21:12 -07001226 fc_exch_els_rrq(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001227 break;
1228 case ELS_REC:
Joe Eykholt922611562010-07-20 15:21:12 -07001229 fc_exch_els_rec(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001230 break;
1231 default:
Joe Eykholt922611562010-07-20 15:21:12 -07001232 FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd);
Robert Love42e9a922008-12-09 15:10:17 -08001233 }
1234}
Robert Love42e9a922008-12-09 15:10:17 -08001235
Robert Love3a3b42b2009-11-03 11:47:39 -08001236/**
1237 * fc_seq_send_last() - Send a sequence that is the last in the exchange
1238 * @sp: The sequence that is to be sent
1239 * @fp: The frame that will be sent on the sequence
1240 * @rctl: The R_CTL information to be sent
1241 * @fh_type: The frame header type
Robert Love42e9a922008-12-09 15:10:17 -08001242 */
1243static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp,
1244 enum fc_rctl rctl, enum fc_fh_type fh_type)
1245{
1246 u32 f_ctl;
1247 struct fc_exch *ep = fc_seq_exch(sp);
1248
1249 f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1250 f_ctl |= ep->f_ctl;
1251 fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0);
Neil Hormanfb00cc22013-05-03 19:34:15 +00001252 fc_seq_send_locked(ep->lp, sp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001253}
1254
Robert Love3a3b42b2009-11-03 11:47:39 -08001255/**
1256 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
1257 * @sp: The sequence to send the ACK on
1258 * @rx_fp: The received frame that is being acknoledged
1259 *
Robert Love42e9a922008-12-09 15:10:17 -08001260 * Send ACK_1 (or equiv.) indicating we received something.
Robert Love42e9a922008-12-09 15:10:17 -08001261 */
1262static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp)
1263{
1264 struct fc_frame *fp;
1265 struct fc_frame_header *rx_fh;
1266 struct fc_frame_header *fh;
1267 struct fc_exch *ep = fc_seq_exch(sp);
Robert Love3a3b42b2009-11-03 11:47:39 -08001268 struct fc_lport *lport = ep->lp;
Robert Love42e9a922008-12-09 15:10:17 -08001269 unsigned int f_ctl;
1270
1271 /*
1272 * Don't send ACKs for class 3.
1273 */
1274 if (fc_sof_needs_ack(fr_sof(rx_fp))) {
Robert Love3a3b42b2009-11-03 11:47:39 -08001275 fp = fc_frame_alloc(lport, 0);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001276 if (!fp) {
1277 FC_EXCH_DBG(ep, "Drop ACK request, out of memory\n");
Robert Love42e9a922008-12-09 15:10:17 -08001278 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001279 }
Robert Love42e9a922008-12-09 15:10:17 -08001280
1281 fh = fc_frame_header_get(fp);
1282 fh->fh_r_ctl = FC_RCTL_ACK_1;
1283 fh->fh_type = FC_TYPE_BLS;
1284
1285 /*
1286 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1287 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1288 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1289 * Last ACK uses bits 7-6 (continue sequence),
1290 * bits 5-4 are meaningful (what kind of ACK to use).
1291 */
1292 rx_fh = fc_frame_header_get(rx_fp);
1293 f_ctl = ntoh24(rx_fh->fh_f_ctl);
1294 f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
1295 FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ |
1296 FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT |
1297 FC_FC_RETX_SEQ | FC_FC_UNI_TX;
1298 f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
1299 hton24(fh->fh_f_ctl, f_ctl);
1300
1301 fc_exch_setup_hdr(ep, fp, f_ctl);
1302 fh->fh_seq_id = rx_fh->fh_seq_id;
1303 fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
1304 fh->fh_parm_offset = htonl(1); /* ack single frame */
1305
1306 fr_sof(fp) = fr_sof(rx_fp);
1307 if (f_ctl & FC_FC_END_SEQ)
1308 fr_eof(fp) = FC_EOF_T;
1309 else
1310 fr_eof(fp) = FC_EOF_N;
1311
Robert Love3a3b42b2009-11-03 11:47:39 -08001312 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001313 }
1314}
1315
Robert Love3a3b42b2009-11-03 11:47:39 -08001316/**
1317 * fc_exch_send_ba_rjt() - Send BLS Reject
1318 * @rx_fp: The frame being rejected
1319 * @reason: The reason the frame is being rejected
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001320 * @explan: The explanation for the rejection
Robert Love3a3b42b2009-11-03 11:47:39 -08001321 *
Robert Love42e9a922008-12-09 15:10:17 -08001322 * This is for rejecting BA_ABTS only.
1323 */
Robert Loveb2ab99c2009-02-27 10:55:50 -08001324static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp,
1325 enum fc_ba_rjt_reason reason,
1326 enum fc_ba_rjt_explan explan)
Robert Love42e9a922008-12-09 15:10:17 -08001327{
1328 struct fc_frame *fp;
1329 struct fc_frame_header *rx_fh;
1330 struct fc_frame_header *fh;
1331 struct fc_ba_rjt *rp;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001332 struct fc_seq *sp;
Robert Love3a3b42b2009-11-03 11:47:39 -08001333 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08001334 unsigned int f_ctl;
1335
Robert Love3a3b42b2009-11-03 11:47:39 -08001336 lport = fr_dev(rx_fp);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001337 sp = fr_seq(rx_fp);
Robert Love3a3b42b2009-11-03 11:47:39 -08001338 fp = fc_frame_alloc(lport, sizeof(*rp));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001339 if (!fp) {
1340 FC_EXCH_DBG(fc_seq_exch(sp),
1341 "Drop BA_RJT request, out of memory\n");
Robert Love42e9a922008-12-09 15:10:17 -08001342 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001343 }
Robert Love42e9a922008-12-09 15:10:17 -08001344 fh = fc_frame_header_get(fp);
1345 rx_fh = fc_frame_header_get(rx_fp);
1346
1347 memset(fh, 0, sizeof(*fh) + sizeof(*rp));
1348
1349 rp = fc_frame_payload_get(fp, sizeof(*rp));
1350 rp->br_reason = reason;
1351 rp->br_explan = explan;
1352
1353 /*
1354 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1355 */
1356 memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3);
1357 memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3);
Joe Eykholt1d490ce2009-08-25 14:04:03 -07001358 fh->fh_ox_id = rx_fh->fh_ox_id;
1359 fh->fh_rx_id = rx_fh->fh_rx_id;
Robert Love42e9a922008-12-09 15:10:17 -08001360 fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
1361 fh->fh_r_ctl = FC_RCTL_BA_RJT;
1362 fh->fh_type = FC_TYPE_BLS;
1363
1364 /*
1365 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1366 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1367 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1368 * Last ACK uses bits 7-6 (continue sequence),
1369 * bits 5-4 are meaningful (what kind of ACK to use).
1370 * Always set LAST_SEQ, END_SEQ.
1371 */
1372 f_ctl = ntoh24(rx_fh->fh_f_ctl);
1373 f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
1374 FC_FC_END_CONN | FC_FC_SEQ_INIT |
1375 FC_FC_RETX_SEQ | FC_FC_UNI_TX;
1376 f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
1377 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
1378 f_ctl &= ~FC_FC_FIRST_SEQ;
1379 hton24(fh->fh_f_ctl, f_ctl);
1380
1381 fr_sof(fp) = fc_sof_class(fr_sof(rx_fp));
1382 fr_eof(fp) = FC_EOF_T;
1383 if (fc_sof_needs_ack(fr_sof(fp)))
1384 fr_eof(fp) = FC_EOF_N;
1385
Robert Love3a3b42b2009-11-03 11:47:39 -08001386 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001387}
1388
Robert Love3a3b42b2009-11-03 11:47:39 -08001389/**
1390 * fc_exch_recv_abts() - Handle an incoming ABTS
1391 * @ep: The exchange the abort was on
1392 * @rx_fp: The ABTS frame
1393 *
1394 * This would be for target mode usually, but could be due to lost
1395 * FCP transfer ready, confirm or RRQ. We always handle this as an
1396 * exchange abort, ignoring the parameter.
Robert Love42e9a922008-12-09 15:10:17 -08001397 */
1398static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
1399{
1400 struct fc_frame *fp;
1401 struct fc_ba_acc *ap;
1402 struct fc_frame_header *fh;
1403 struct fc_seq *sp;
1404
1405 if (!ep)
1406 goto reject;
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001407
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001408 FC_EXCH_DBG(ep, "exch: ABTS received\n");
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001409 fp = fc_frame_alloc(ep->lp, sizeof(*ap));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001410 if (!fp) {
1411 FC_EXCH_DBG(ep, "Drop ABTS request, out of memory\n");
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001412 goto free;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001413 }
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001414
Robert Love42e9a922008-12-09 15:10:17 -08001415 spin_lock_bh(&ep->ex_lock);
1416 if (ep->esb_stat & ESB_ST_COMPLETE) {
1417 spin_unlock_bh(&ep->ex_lock);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001418 FC_EXCH_DBG(ep, "exch: ABTS rejected, exchange complete\n");
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001419 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001420 goto reject;
1421 }
Bart Van Asschecae7b6d2013-08-14 15:37:52 +00001422 if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
1423 ep->esb_stat |= ESB_ST_REC_QUAL;
Robert Love42e9a922008-12-09 15:10:17 -08001424 fc_exch_hold(ep); /* hold for REC_QUAL */
Bart Van Asschecae7b6d2013-08-14 15:37:52 +00001425 }
Robert Love42e9a922008-12-09 15:10:17 -08001426 fc_exch_timer_set_locked(ep, ep->r_a_tov);
Robert Love42e9a922008-12-09 15:10:17 -08001427 fh = fc_frame_header_get(fp);
1428 ap = fc_frame_payload_get(fp, sizeof(*ap));
1429 memset(ap, 0, sizeof(*ap));
1430 sp = &ep->seq;
1431 ap->ba_high_seq_cnt = htons(0xffff);
1432 if (sp->ssb_stat & SSB_ST_RESP) {
1433 ap->ba_seq_id = sp->id;
1434 ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL;
1435 ap->ba_high_seq_cnt = fh->fh_seq_cnt;
1436 ap->ba_low_seq_cnt = htons(sp->cnt);
1437 }
Vasu Deva7e84f22009-02-27 10:54:51 -08001438 sp = fc_seq_start_next_locked(sp);
Robert Love42e9a922008-12-09 15:10:17 -08001439 fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
Bart Van Asschecae7b6d2013-08-14 15:37:52 +00001440 ep->esb_stat |= ESB_ST_ABNORMAL;
Neil Hormanfb00cc22013-05-03 19:34:15 +00001441 spin_unlock_bh(&ep->ex_lock);
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001442
1443free:
Robert Love42e9a922008-12-09 15:10:17 -08001444 fc_frame_free(rx_fp);
1445 return;
1446
1447reject:
1448 fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID);
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001449 goto free;
Robert Love42e9a922008-12-09 15:10:17 -08001450}
1451
Robert Love3a3b42b2009-11-03 11:47:39 -08001452/**
Joe Eykholt239e8102010-07-20 15:21:07 -07001453 * fc_seq_assign() - Assign exchange and sequence for incoming request
1454 * @lport: The local port that received the request
1455 * @fp: The request frame
1456 *
1457 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
Joe Eykholt62bdb642011-01-28 16:04:34 -08001458 * A reference will be held on the exchange/sequence for the caller, which
1459 * must call fc_seq_release().
Joe Eykholt239e8102010-07-20 15:21:07 -07001460 */
1461static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp)
1462{
1463 struct fc_exch_mgr_anchor *ema;
1464
1465 WARN_ON(lport != fr_dev(fp));
1466 WARN_ON(fr_seq(fp));
1467 fr_seq(fp) = NULL;
1468
1469 list_for_each_entry(ema, &lport->ema_list, ema_list)
1470 if ((!ema->match || ema->match(fp)) &&
Hillf Danton530994d2010-11-30 16:18:28 -08001471 fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE)
Joe Eykholt239e8102010-07-20 15:21:07 -07001472 break;
1473 return fr_seq(fp);
1474}
1475
1476/**
Joe Eykholt62bdb642011-01-28 16:04:34 -08001477 * fc_seq_release() - Release the hold
1478 * @sp: The sequence.
1479 */
1480static void fc_seq_release(struct fc_seq *sp)
1481{
1482 fc_exch_release(fc_seq_exch(sp));
1483}
1484
1485/**
Joe Eykholt922611562010-07-20 15:21:12 -07001486 * fc_exch_recv_req() - Handler for an incoming request
Robert Love3a3b42b2009-11-03 11:47:39 -08001487 * @lport: The local port that received the request
1488 * @mp: The EM that the exchange is on
1489 * @fp: The request frame
Joe Eykholt922611562010-07-20 15:21:12 -07001490 *
1491 * This is used when the other end is originating the exchange
1492 * and the sequence.
Robert Love42e9a922008-12-09 15:10:17 -08001493 */
Robert Love3a3b42b2009-11-03 11:47:39 -08001494static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp,
Robert Love42e9a922008-12-09 15:10:17 -08001495 struct fc_frame *fp)
1496{
1497 struct fc_frame_header *fh = fc_frame_header_get(fp);
1498 struct fc_seq *sp = NULL;
1499 struct fc_exch *ep = NULL;
Robert Love42e9a922008-12-09 15:10:17 -08001500 enum fc_pf_rjt_reason reject;
1501
Chris Leech174e1eb2009-11-03 11:46:14 -08001502 /* We can have the wrong fc_lport at this point with NPIV, which is a
1503 * problem now that we know a new exchange needs to be allocated
1504 */
Robert Love3a3b42b2009-11-03 11:47:39 -08001505 lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id));
1506 if (!lport) {
Chris Leech174e1eb2009-11-03 11:46:14 -08001507 fc_frame_free(fp);
1508 return;
1509 }
Joe Eykholt922611562010-07-20 15:21:12 -07001510 fr_dev(fp) = lport;
Chris Leech174e1eb2009-11-03 11:46:14 -08001511
Joe Eykholt922611562010-07-20 15:21:12 -07001512 BUG_ON(fr_seq(fp)); /* XXX remove later */
1513
1514 /*
1515 * If the RX_ID is 0xffff, don't allocate an exchange.
1516 * The upper-level protocol may request one later, if needed.
1517 */
1518 if (fh->fh_rx_id == htons(FC_XID_UNKNOWN))
1519 return lport->tt.lport_recv(lport, fp);
1520
Robert Love3a3b42b2009-11-03 11:47:39 -08001521 reject = fc_seq_lookup_recip(lport, mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001522 if (reject == FC_RJT_NONE) {
1523 sp = fr_seq(fp); /* sequence will be held */
1524 ep = fc_seq_exch(sp);
Robert Love42e9a922008-12-09 15:10:17 -08001525 fc_seq_send_ack(sp, fp);
Joe Eykholtf60e12e2010-07-20 15:20:14 -07001526 ep->encaps = fr_encaps(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001527
1528 /*
1529 * Call the receive function.
1530 *
1531 * The receive function may allocate a new sequence
1532 * over the old one, so we shouldn't change the
1533 * sequence after this.
1534 *
1535 * The frame will be freed by the receive function.
1536 * If new exch resp handler is valid then call that
1537 * first.
1538 */
Bart Van Assche7030fd62013-08-17 20:34:43 +00001539 if (!fc_invoke_resp(ep, sp, fp))
Joe Eykholt922611562010-07-20 15:21:12 -07001540 lport->tt.lport_recv(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001541 fc_exch_release(ep); /* release from lookup */
1542 } else {
Robert Love3a3b42b2009-11-03 11:47:39 -08001543 FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n",
1544 reject);
Robert Love42e9a922008-12-09 15:10:17 -08001545 fc_frame_free(fp);
1546 }
1547}
1548
Robert Love3a3b42b2009-11-03 11:47:39 -08001549/**
1550 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1551 * end is the originator of the sequence that is a
1552 * response to our initial exchange
1553 * @mp: The EM that the exchange is on
1554 * @fp: The response frame
Robert Love42e9a922008-12-09 15:10:17 -08001555 */
1556static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
1557{
1558 struct fc_frame_header *fh = fc_frame_header_get(fp);
1559 struct fc_seq *sp;
1560 struct fc_exch *ep;
1561 enum fc_sof sof;
1562 u32 f_ctl;
Robert Love42e9a922008-12-09 15:10:17 -08001563 int rc;
1564
1565 ep = fc_exch_find(mp, ntohs(fh->fh_ox_id));
1566 if (!ep) {
1567 atomic_inc(&mp->stats.xid_not_found);
1568 goto out;
1569 }
Steve Ma30121d12009-05-06 10:52:29 -07001570 if (ep->esb_stat & ESB_ST_COMPLETE) {
1571 atomic_inc(&mp->stats.xid_not_found);
Hillf Danton82365542010-11-30 16:18:12 -08001572 goto rel;
Steve Ma30121d12009-05-06 10:52:29 -07001573 }
Robert Love42e9a922008-12-09 15:10:17 -08001574 if (ep->rxid == FC_XID_UNKNOWN)
1575 ep->rxid = ntohs(fh->fh_rx_id);
1576 if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) {
1577 atomic_inc(&mp->stats.xid_not_found);
1578 goto rel;
1579 }
1580 if (ep->did != ntoh24(fh->fh_s_id) &&
1581 ep->did != FC_FID_FLOGI) {
1582 atomic_inc(&mp->stats.xid_not_found);
1583 goto rel;
1584 }
1585 sof = fr_sof(fp);
Vasu Deva104c842010-03-12 16:08:34 -08001586 sp = &ep->seq;
Joe Eykholtb3667f92010-05-07 15:18:13 -07001587 if (fc_sof_is_init(sof)) {
Robert Love42e9a922008-12-09 15:10:17 -08001588 sp->ssb_stat |= SSB_ST_RESP;
Joe Eykholtb3667f92010-05-07 15:18:13 -07001589 sp->id = fh->fh_seq_id;
1590 } else if (sp->id != fh->fh_seq_id) {
1591 atomic_inc(&mp->stats.seq_not_found);
1592 goto rel;
Robert Love42e9a922008-12-09 15:10:17 -08001593 }
Vasu Deva104c842010-03-12 16:08:34 -08001594
Robert Love42e9a922008-12-09 15:10:17 -08001595 f_ctl = ntoh24(fh->fh_f_ctl);
1596 fr_seq(fp) = sp;
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001597
1598 spin_lock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001599 if (f_ctl & FC_FC_SEQ_INIT)
1600 ep->esb_stat |= ESB_ST_SEQ_INIT;
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001601 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001602
1603 if (fc_sof_needs_ack(sof))
1604 fc_seq_send_ack(sp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001605
1606 if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T &&
1607 (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
1608 (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
1609 spin_lock_bh(&ep->ex_lock);
1610 rc = fc_exch_done_locked(ep);
1611 WARN_ON(fc_seq_exch(sp) != ep);
1612 spin_unlock_bh(&ep->ex_lock);
1613 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -07001614 fc_exch_delete(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001615 }
1616
1617 /*
1618 * Call the receive function.
1619 * The sequence is held (has a refcnt) for us,
1620 * but not for the receive function.
1621 *
1622 * The receive function may allocate a new sequence
1623 * over the old one, so we shouldn't change the
1624 * sequence after this.
1625 *
1626 * The frame will be freed by the receive function.
1627 * If new exch resp handler is valid then call that
1628 * first.
1629 */
Bart Van Asschef6979ad2015-06-05 14:20:46 -07001630 if (!fc_invoke_resp(ep, sp, fp))
1631 fc_frame_free(fp);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001632
Robert Love42e9a922008-12-09 15:10:17 -08001633 fc_exch_release(ep);
1634 return;
1635rel:
1636 fc_exch_release(ep);
1637out:
1638 fc_frame_free(fp);
1639}
1640
Robert Love3a3b42b2009-11-03 11:47:39 -08001641/**
1642 * fc_exch_recv_resp() - Handler for a sequence where other end is
1643 * responding to our sequence
1644 * @mp: The EM that the exchange is on
1645 * @fp: The response frame
Robert Love42e9a922008-12-09 15:10:17 -08001646 */
1647static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
1648{
1649 struct fc_seq *sp;
1650
1651 sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */
Robert Loved459b7e2009-07-29 17:05:05 -07001652
1653 if (!sp)
Robert Love42e9a922008-12-09 15:10:17 -08001654 atomic_inc(&mp->stats.xid_not_found);
Robert Loved459b7e2009-07-29 17:05:05 -07001655 else
Robert Love42e9a922008-12-09 15:10:17 -08001656 atomic_inc(&mp->stats.non_bls_resp);
Robert Loved459b7e2009-07-29 17:05:05 -07001657
Robert Love42e9a922008-12-09 15:10:17 -08001658 fc_frame_free(fp);
1659}
1660
Robert Love3a3b42b2009-11-03 11:47:39 -08001661/**
1662 * fc_exch_abts_resp() - Handler for a response to an ABT
1663 * @ep: The exchange that the frame is on
1664 * @fp: The response frame
1665 *
1666 * This response would be to an ABTS cancelling an exchange or sequence.
1667 * The response can be either BA_ACC or BA_RJT
Robert Love42e9a922008-12-09 15:10:17 -08001668 */
1669static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
1670{
Robert Love42e9a922008-12-09 15:10:17 -08001671 struct fc_frame_header *fh;
1672 struct fc_ba_acc *ap;
1673 struct fc_seq *sp;
1674 u16 low;
1675 u16 high;
1676 int rc = 1, has_rec = 0;
1677
1678 fh = fc_frame_header_get(fp);
Robert Love74147052009-06-10 15:31:10 -07001679 FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl,
1680 fc_exch_rctl_name(fh->fh_r_ctl));
Robert Love42e9a922008-12-09 15:10:17 -08001681
Vasu Devb29a4f32012-07-06 10:40:10 -07001682 if (cancel_delayed_work_sync(&ep->timeout_work)) {
Robert Love3a292602013-06-11 07:28:09 +00001683 FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n");
Robert Love42e9a922008-12-09 15:10:17 -08001684 fc_exch_release(ep); /* release from pending timer hold */
Vasu Devb29a4f32012-07-06 10:40:10 -07001685 }
Robert Love42e9a922008-12-09 15:10:17 -08001686
1687 spin_lock_bh(&ep->ex_lock);
1688 switch (fh->fh_r_ctl) {
1689 case FC_RCTL_BA_ACC:
1690 ap = fc_frame_payload_get(fp, sizeof(*ap));
1691 if (!ap)
1692 break;
1693
1694 /*
1695 * Decide whether to establish a Recovery Qualifier.
1696 * We do this if there is a non-empty SEQ_CNT range and
1697 * SEQ_ID is the same as the one we aborted.
1698 */
1699 low = ntohs(ap->ba_low_seq_cnt);
1700 high = ntohs(ap->ba_high_seq_cnt);
1701 if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 &&
1702 (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL ||
1703 ap->ba_seq_id == ep->seq_id) && low != high) {
1704 ep->esb_stat |= ESB_ST_REC_QUAL;
1705 fc_exch_hold(ep); /* hold for recovery qualifier */
1706 has_rec = 1;
1707 }
1708 break;
1709 case FC_RCTL_BA_RJT:
1710 break;
1711 default:
1712 break;
1713 }
1714
Robert Love42e9a922008-12-09 15:10:17 -08001715 /* do we need to do some other checks here. Can we reuse more of
1716 * fc_exch_recv_seq_resp
1717 */
1718 sp = &ep->seq;
1719 /*
1720 * do we want to check END_SEQ as well as LAST_SEQ here?
1721 */
1722 if (ep->fh_type != FC_TYPE_FCP &&
1723 ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ)
1724 rc = fc_exch_done_locked(ep);
1725 spin_unlock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001726
1727 fc_exch_hold(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001728 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -07001729 fc_exch_delete(ep);
Bart Van Asschef6979ad2015-06-05 14:20:46 -07001730 if (!fc_invoke_resp(ep, sp, fp))
1731 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001732 if (has_rec)
1733 fc_exch_timer_set(ep, ep->r_a_tov);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001734 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001735}
1736
Robert Love3a3b42b2009-11-03 11:47:39 -08001737/**
1738 * fc_exch_recv_bls() - Handler for a BLS sequence
1739 * @mp: The EM that the exchange is on
1740 * @fp: The request frame
1741 *
1742 * The BLS frame is always a sequence initiated by the remote side.
Robert Love42e9a922008-12-09 15:10:17 -08001743 * We may be either the originator or recipient of the exchange.
1744 */
1745static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp)
1746{
1747 struct fc_frame_header *fh;
1748 struct fc_exch *ep;
1749 u32 f_ctl;
1750
1751 fh = fc_frame_header_get(fp);
1752 f_ctl = ntoh24(fh->fh_f_ctl);
1753 fr_seq(fp) = NULL;
1754
1755 ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ?
1756 ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id));
1757 if (ep && (f_ctl & FC_FC_SEQ_INIT)) {
1758 spin_lock_bh(&ep->ex_lock);
1759 ep->esb_stat |= ESB_ST_SEQ_INIT;
1760 spin_unlock_bh(&ep->ex_lock);
1761 }
1762 if (f_ctl & FC_FC_SEQ_CTX) {
1763 /*
1764 * A response to a sequence we initiated.
1765 * This should only be ACKs for class 2 or F.
1766 */
1767 switch (fh->fh_r_ctl) {
1768 case FC_RCTL_ACK_1:
1769 case FC_RCTL_ACK_0:
1770 break;
1771 default:
Bhanu Prakash Gollapudid4042e92012-02-10 17:18:51 -08001772 if (ep)
Bart Van Asscheb20d9bf2013-08-14 15:32:51 +00001773 FC_EXCH_DBG(ep, "BLS rctl %x - %s received\n",
Bhanu Prakash Gollapudid4042e92012-02-10 17:18:51 -08001774 fh->fh_r_ctl,
1775 fc_exch_rctl_name(fh->fh_r_ctl));
Robert Love42e9a922008-12-09 15:10:17 -08001776 break;
1777 }
1778 fc_frame_free(fp);
1779 } else {
1780 switch (fh->fh_r_ctl) {
1781 case FC_RCTL_BA_RJT:
1782 case FC_RCTL_BA_ACC:
1783 if (ep)
1784 fc_exch_abts_resp(ep, fp);
1785 else
1786 fc_frame_free(fp);
1787 break;
1788 case FC_RCTL_BA_ABTS:
Hannes Reineckeb73aa562016-10-13 15:10:49 +02001789 if (ep)
1790 fc_exch_recv_abts(ep, fp);
1791 else
1792 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001793 break;
1794 default: /* ignore junk */
1795 fc_frame_free(fp);
1796 break;
1797 }
1798 }
1799 if (ep)
1800 fc_exch_release(ep); /* release hold taken by fc_exch_find */
1801}
1802
Robert Love3a3b42b2009-11-03 11:47:39 -08001803/**
1804 * fc_seq_ls_acc() - Accept sequence with LS_ACC
Joe Eykholt922611562010-07-20 15:21:12 -07001805 * @rx_fp: The received frame, not freed here.
Robert Love3a3b42b2009-11-03 11:47:39 -08001806 *
Robert Love42e9a922008-12-09 15:10:17 -08001807 * If this fails due to allocation or transmit congestion, assume the
1808 * originator will repeat the sequence.
1809 */
Joe Eykholt922611562010-07-20 15:21:12 -07001810static void fc_seq_ls_acc(struct fc_frame *rx_fp)
Robert Love42e9a922008-12-09 15:10:17 -08001811{
Joe Eykholt922611562010-07-20 15:21:12 -07001812 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08001813 struct fc_els_ls_acc *acc;
1814 struct fc_frame *fp;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001815 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -08001816
Joe Eykholt922611562010-07-20 15:21:12 -07001817 lport = fr_dev(rx_fp);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001818 sp = fr_seq(rx_fp);
Joe Eykholt922611562010-07-20 15:21:12 -07001819 fp = fc_frame_alloc(lport, sizeof(*acc));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001820 if (!fp) {
1821 FC_EXCH_DBG(fc_seq_exch(sp),
1822 "exch: drop LS_ACC, out of memory\n");
Joe Eykholt922611562010-07-20 15:21:12 -07001823 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001824 }
Joe Eykholt922611562010-07-20 15:21:12 -07001825 acc = fc_frame_payload_get(fp, sizeof(*acc));
1826 memset(acc, 0, sizeof(*acc));
1827 acc->la_cmd = ELS_LS_ACC;
1828 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1829 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001830}
1831
Robert Love3a3b42b2009-11-03 11:47:39 -08001832/**
1833 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
Joe Eykholt922611562010-07-20 15:21:12 -07001834 * @rx_fp: The received frame, not freed here.
Robert Love3a3b42b2009-11-03 11:47:39 -08001835 * @reason: The reason the sequence is being rejected
Joe Eykholt922611562010-07-20 15:21:12 -07001836 * @explan: The explanation for the rejection
Robert Love3a3b42b2009-11-03 11:47:39 -08001837 *
Robert Love42e9a922008-12-09 15:10:17 -08001838 * If this fails due to allocation or transmit congestion, assume the
1839 * originator will repeat the sequence.
1840 */
Joe Eykholt922611562010-07-20 15:21:12 -07001841static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason,
Robert Love42e9a922008-12-09 15:10:17 -08001842 enum fc_els_rjt_explan explan)
1843{
Joe Eykholt922611562010-07-20 15:21:12 -07001844 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08001845 struct fc_els_ls_rjt *rjt;
1846 struct fc_frame *fp;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001847 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -08001848
Joe Eykholt922611562010-07-20 15:21:12 -07001849 lport = fr_dev(rx_fp);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001850 sp = fr_seq(rx_fp);
Joe Eykholt922611562010-07-20 15:21:12 -07001851 fp = fc_frame_alloc(lport, sizeof(*rjt));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001852 if (!fp) {
1853 FC_EXCH_DBG(fc_seq_exch(sp),
1854 "exch: drop LS_ACC, out of memory\n");
Joe Eykholt922611562010-07-20 15:21:12 -07001855 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001856 }
Joe Eykholt922611562010-07-20 15:21:12 -07001857 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1858 memset(rjt, 0, sizeof(*rjt));
1859 rjt->er_cmd = ELS_LS_RJT;
1860 rjt->er_reason = reason;
1861 rjt->er_explan = explan;
1862 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1863 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001864}
1865
Robert Love3a3b42b2009-11-03 11:47:39 -08001866/**
1867 * fc_exch_reset() - Reset an exchange
1868 * @ep: The exchange to be reset
Bart Van Assche7030fd62013-08-17 20:34:43 +00001869 *
1870 * Note: May sleep if invoked from outside a response handler.
Robert Love3a3b42b2009-11-03 11:47:39 -08001871 */
Robert Love42e9a922008-12-09 15:10:17 -08001872static void fc_exch_reset(struct fc_exch *ep)
1873{
1874 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -08001875 int rc = 1;
1876
1877 spin_lock_bh(&ep->ex_lock);
1878 ep->state |= FC_EX_RST_CLEANUP;
Vasu Devb29a4f32012-07-06 10:40:10 -07001879 fc_exch_timer_cancel(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001880 if (ep->esb_stat & ESB_ST_REC_QUAL)
1881 atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */
1882 ep->esb_stat &= ~ESB_ST_REC_QUAL;
Robert Love42e9a922008-12-09 15:10:17 -08001883 sp = &ep->seq;
1884 rc = fc_exch_done_locked(ep);
1885 spin_unlock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001886
1887 fc_exch_hold(ep);
1888
Robert Love42e9a922008-12-09 15:10:17 -08001889 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -07001890 fc_exch_delete(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001891
Bart Van Assche7030fd62013-08-17 20:34:43 +00001892 fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED));
1893 fc_seq_set_resp(sp, NULL, ep->arg);
1894 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001895}
1896
Vasu Devb2f00912009-08-25 13:58:53 -07001897/**
Robert Love3a3b42b2009-11-03 11:47:39 -08001898 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1899 * @lport: The local port that the exchange pool is on
1900 * @pool: The exchange pool to be reset
1901 * @sid: The source ID
1902 * @did: The destination ID
Vasu Devb2f00912009-08-25 13:58:53 -07001903 *
Robert Love3a3b42b2009-11-03 11:47:39 -08001904 * Resets a per cpu exches pool, releasing all of its sequences
1905 * and exchanges. If sid is non-zero then reset only exchanges
1906 * we sourced from the local port's FID. If did is non-zero then
1907 * only reset exchanges destined for the local port's FID.
Robert Love42e9a922008-12-09 15:10:17 -08001908 */
Vasu Devb2f00912009-08-25 13:58:53 -07001909static void fc_exch_pool_reset(struct fc_lport *lport,
1910 struct fc_exch_pool *pool,
1911 u32 sid, u32 did)
Robert Love42e9a922008-12-09 15:10:17 -08001912{
1913 struct fc_exch *ep;
1914 struct fc_exch *next;
Robert Love42e9a922008-12-09 15:10:17 -08001915
Vasu Devb2f00912009-08-25 13:58:53 -07001916 spin_lock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -08001917restart:
Vasu Devb2f00912009-08-25 13:58:53 -07001918 list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) {
1919 if ((lport == ep->lp) &&
1920 (sid == 0 || sid == ep->sid) &&
1921 (did == 0 || did == ep->did)) {
1922 fc_exch_hold(ep);
1923 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -08001924
Vasu Devb2f00912009-08-25 13:58:53 -07001925 fc_exch_reset(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001926
Vasu Devb2f00912009-08-25 13:58:53 -07001927 fc_exch_release(ep);
1928 spin_lock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -08001929
Vasu Devb2f00912009-08-25 13:58:53 -07001930 /*
1931 * must restart loop incase while lock
1932 * was down multiple eps were released.
1933 */
1934 goto restart;
Robert Love42e9a922008-12-09 15:10:17 -08001935 }
Vasu Devb2f00912009-08-25 13:58:53 -07001936 }
Vasu Devb6e3c842011-10-28 11:34:17 -07001937 pool->next_index = 0;
1938 pool->left = FC_XID_UNKNOWN;
1939 pool->right = FC_XID_UNKNOWN;
Vasu Devb2f00912009-08-25 13:58:53 -07001940 spin_unlock_bh(&pool->lock);
1941}
1942
1943/**
Robert Love3a3b42b2009-11-03 11:47:39 -08001944 * fc_exch_mgr_reset() - Reset all EMs of a local port
1945 * @lport: The local port whose EMs are to be reset
1946 * @sid: The source ID
1947 * @did: The destination ID
Vasu Devb2f00912009-08-25 13:58:53 -07001948 *
Robert Love3a3b42b2009-11-03 11:47:39 -08001949 * Reset all EMs associated with a given local port. Release all
1950 * sequences and exchanges. If sid is non-zero then reset only the
1951 * exchanges sent from the local port's FID. If did is non-zero then
1952 * reset only exchanges destined for the local port's FID.
Vasu Devb2f00912009-08-25 13:58:53 -07001953 */
1954void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did)
1955{
1956 struct fc_exch_mgr_anchor *ema;
1957 unsigned int cpu;
1958
1959 list_for_each_entry(ema, &lport->ema_list, ema_list) {
1960 for_each_possible_cpu(cpu)
1961 fc_exch_pool_reset(lport,
1962 per_cpu_ptr(ema->mp->pool, cpu),
1963 sid, did);
Robert Love42e9a922008-12-09 15:10:17 -08001964 }
Robert Love42e9a922008-12-09 15:10:17 -08001965}
1966EXPORT_SYMBOL(fc_exch_mgr_reset);
1967
Robert Love3a3b42b2009-11-03 11:47:39 -08001968/**
Joe Eykholt922611562010-07-20 15:21:12 -07001969 * fc_exch_lookup() - find an exchange
1970 * @lport: The local port
1971 * @xid: The exchange ID
1972 *
1973 * Returns exchange pointer with hold for caller, or NULL if not found.
1974 */
1975static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid)
1976{
1977 struct fc_exch_mgr_anchor *ema;
1978
1979 list_for_each_entry(ema, &lport->ema_list, ema_list)
1980 if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid)
1981 return fc_exch_find(ema->mp, xid);
1982 return NULL;
1983}
1984
1985/**
Robert Love3a3b42b2009-11-03 11:47:39 -08001986 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
Joe Eykholt922611562010-07-20 15:21:12 -07001987 * @rfp: The REC frame, not freed here.
Robert Love3a3b42b2009-11-03 11:47:39 -08001988 *
Robert Love42e9a922008-12-09 15:10:17 -08001989 * Note that the requesting port may be different than the S_ID in the request.
1990 */
Joe Eykholt922611562010-07-20 15:21:12 -07001991static void fc_exch_els_rec(struct fc_frame *rfp)
Robert Love42e9a922008-12-09 15:10:17 -08001992{
Joe Eykholt922611562010-07-20 15:21:12 -07001993 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08001994 struct fc_frame *fp;
1995 struct fc_exch *ep;
Robert Love42e9a922008-12-09 15:10:17 -08001996 struct fc_els_rec *rp;
1997 struct fc_els_rec_acc *acc;
1998 enum fc_els_rjt_reason reason = ELS_RJT_LOGIC;
1999 enum fc_els_rjt_explan explan;
2000 u32 sid;
2001 u16 rxid;
2002 u16 oxid;
2003
Joe Eykholt922611562010-07-20 15:21:12 -07002004 lport = fr_dev(rfp);
Robert Love42e9a922008-12-09 15:10:17 -08002005 rp = fc_frame_payload_get(rfp, sizeof(*rp));
2006 explan = ELS_EXPL_INV_LEN;
2007 if (!rp)
2008 goto reject;
2009 sid = ntoh24(rp->rec_s_id);
2010 rxid = ntohs(rp->rec_rx_id);
2011 oxid = ntohs(rp->rec_ox_id);
2012
Joe Eykholt922611562010-07-20 15:21:12 -07002013 ep = fc_exch_lookup(lport,
2014 sid == fc_host_port_id(lport->host) ? oxid : rxid);
Robert Love42e9a922008-12-09 15:10:17 -08002015 explan = ELS_EXPL_OXID_RXID;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002016 if (!ep) {
2017 FC_LPORT_DBG(lport,
2018 "REC request from %x: rxid %x oxid %x not found\n",
2019 sid, rxid, oxid);
Joe Eykholt922611562010-07-20 15:21:12 -07002020 goto reject;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002021 }
2022 FC_EXCH_DBG(ep, "REC request from %x: rxid %x oxid %x\n",
2023 sid, rxid, oxid);
Joe Eykholt922611562010-07-20 15:21:12 -07002024 if (ep->oid != sid || oxid != ep->oxid)
2025 goto rel;
2026 if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid)
2027 goto rel;
2028 fp = fc_frame_alloc(lport, sizeof(*acc));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002029 if (!fp) {
2030 FC_EXCH_DBG(ep, "Drop REC request, out of memory\n");
Robert Love42e9a922008-12-09 15:10:17 -08002031 goto out;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002032 }
Joe Eykholt922611562010-07-20 15:21:12 -07002033
Robert Love42e9a922008-12-09 15:10:17 -08002034 acc = fc_frame_payload_get(fp, sizeof(*acc));
2035 memset(acc, 0, sizeof(*acc));
2036 acc->reca_cmd = ELS_LS_ACC;
2037 acc->reca_ox_id = rp->rec_ox_id;
2038 memcpy(acc->reca_ofid, rp->rec_s_id, 3);
2039 acc->reca_rx_id = htons(ep->rxid);
2040 if (ep->sid == ep->oid)
2041 hton24(acc->reca_rfid, ep->did);
2042 else
2043 hton24(acc->reca_rfid, ep->sid);
2044 acc->reca_fc4value = htonl(ep->seq.rec_data);
2045 acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP |
2046 ESB_ST_SEQ_INIT |
2047 ESB_ST_COMPLETE));
Joe Eykholt922611562010-07-20 15:21:12 -07002048 fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0);
2049 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002050out:
2051 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08002052 return;
2053
2054rel:
2055 fc_exch_release(ep);
2056reject:
Joe Eykholt922611562010-07-20 15:21:12 -07002057 fc_seq_ls_rjt(rfp, reason, explan);
Robert Love42e9a922008-12-09 15:10:17 -08002058}
2059
Robert Love3a3b42b2009-11-03 11:47:39 -08002060/**
2061 * fc_exch_rrq_resp() - Handler for RRQ responses
2062 * @sp: The sequence that the RRQ is on
2063 * @fp: The RRQ frame
2064 * @arg: The exchange that the RRQ is on
Robert Love42e9a922008-12-09 15:10:17 -08002065 *
2066 * TODO: fix error handler.
2067 */
2068static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
2069{
2070 struct fc_exch *aborted_ep = arg;
2071 unsigned int op;
2072
2073 if (IS_ERR(fp)) {
2074 int err = PTR_ERR(fp);
2075
Vasu Dev78342da2009-02-27 10:54:46 -08002076 if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT)
Robert Love42e9a922008-12-09 15:10:17 -08002077 goto cleanup;
Robert Love74147052009-06-10 15:31:10 -07002078 FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, "
2079 "frame error %d\n", err);
Robert Love42e9a922008-12-09 15:10:17 -08002080 return;
2081 }
2082
2083 op = fc_frame_payload_op(fp);
2084 fc_frame_free(fp);
2085
2086 switch (op) {
2087 case ELS_LS_RJT:
Bart Van Asscheb20d9bf2013-08-14 15:32:51 +00002088 FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ\n");
Robert Love42e9a922008-12-09 15:10:17 -08002089 /* fall through */
2090 case ELS_LS_ACC:
2091 goto cleanup;
2092 default:
Bart Van Asscheb20d9bf2013-08-14 15:32:51 +00002093 FC_EXCH_DBG(aborted_ep, "unexpected response op %x for RRQ\n",
2094 op);
Robert Love42e9a922008-12-09 15:10:17 -08002095 return;
2096 }
2097
2098cleanup:
2099 fc_exch_done(&aborted_ep->seq);
2100 /* drop hold for rec qual */
2101 fc_exch_release(aborted_ep);
2102}
2103
Robert Love1a7b75a2009-11-03 11:45:47 -08002104
2105/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002106 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
2107 * @lport: The local port to send the frame on
2108 * @fp: The frame to be sent
2109 * @resp: The response handler for this request
2110 * @destructor: The destructor for the exchange
2111 * @arg: The argument to be passed to the response handler
2112 * @timer_msec: The timeout period for the exchange
2113 *
2114 * The frame pointer with some of the header's fields must be
2115 * filled before calling this routine, those fields are:
2116 *
2117 * - routing control
2118 * - FC port did
2119 * - FC port sid
2120 * - FC header type
2121 * - frame control
2122 * - parameter or relative offset
Robert Love1a7b75a2009-11-03 11:45:47 -08002123 */
Robert Love3a3b42b2009-11-03 11:47:39 -08002124static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport,
Robert Love1a7b75a2009-11-03 11:45:47 -08002125 struct fc_frame *fp,
2126 void (*resp)(struct fc_seq *,
2127 struct fc_frame *fp,
2128 void *arg),
2129 void (*destructor)(struct fc_seq *,
2130 void *),
2131 void *arg, u32 timer_msec)
2132{
2133 struct fc_exch *ep;
2134 struct fc_seq *sp = NULL;
2135 struct fc_frame_header *fh;
Yi Zou3ee17f52011-08-25 12:41:03 -07002136 struct fc_fcp_pkt *fsp = NULL;
Robert Love1a7b75a2009-11-03 11:45:47 -08002137 int rc = 1;
2138
Robert Love3a3b42b2009-11-03 11:47:39 -08002139 ep = fc_exch_alloc(lport, fp);
Robert Love1a7b75a2009-11-03 11:45:47 -08002140 if (!ep) {
2141 fc_frame_free(fp);
2142 return NULL;
2143 }
2144 ep->esb_stat |= ESB_ST_SEQ_INIT;
2145 fh = fc_frame_header_get(fp);
2146 fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id));
2147 ep->resp = resp;
2148 ep->destructor = destructor;
2149 ep->arg = arg;
Hannes Reineckef7ce4132016-10-13 15:10:39 +02002150 ep->r_a_tov = lport->r_a_tov;
Robert Love3a3b42b2009-11-03 11:47:39 -08002151 ep->lp = lport;
Robert Love1a7b75a2009-11-03 11:45:47 -08002152 sp = &ep->seq;
2153
2154 ep->fh_type = fh->fh_type; /* save for possbile timeout handling */
2155 ep->f_ctl = ntoh24(fh->fh_f_ctl);
2156 fc_exch_setup_hdr(ep, fp, ep->f_ctl);
2157 sp->cnt++;
2158
Yi Zou3ee17f52011-08-25 12:41:03 -07002159 if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) {
2160 fsp = fr_fsp(fp);
Robert Love1a7b75a2009-11-03 11:45:47 -08002161 fc_fcp_ddp_setup(fr_fsp(fp), ep->xid);
Yi Zou3ee17f52011-08-25 12:41:03 -07002162 }
Robert Love1a7b75a2009-11-03 11:45:47 -08002163
Robert Love3a3b42b2009-11-03 11:47:39 -08002164 if (unlikely(lport->tt.frame_send(lport, fp)))
Robert Love1a7b75a2009-11-03 11:45:47 -08002165 goto err;
2166
2167 if (timer_msec)
2168 fc_exch_timer_set_locked(ep, timer_msec);
2169 ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */
2170
2171 if (ep->f_ctl & FC_FC_SEQ_INIT)
2172 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
2173 spin_unlock_bh(&ep->ex_lock);
2174 return sp;
2175err:
Yi Zou3ee17f52011-08-25 12:41:03 -07002176 if (fsp)
2177 fc_fcp_ddp_done(fsp);
Robert Love1a7b75a2009-11-03 11:45:47 -08002178 rc = fc_exch_done_locked(ep);
2179 spin_unlock_bh(&ep->ex_lock);
2180 if (!rc)
2181 fc_exch_delete(ep);
2182 return NULL;
2183}
2184
Robert Love3a3b42b2009-11-03 11:47:39 -08002185/**
2186 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
2187 * @ep: The exchange to send the RRQ on
2188 *
Robert Love42e9a922008-12-09 15:10:17 -08002189 * This tells the remote port to stop blocking the use of
2190 * the exchange and the seq_cnt range.
2191 */
2192static void fc_exch_rrq(struct fc_exch *ep)
2193{
Robert Love3a3b42b2009-11-03 11:47:39 -08002194 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08002195 struct fc_els_rrq *rrq;
2196 struct fc_frame *fp;
Robert Love42e9a922008-12-09 15:10:17 -08002197 u32 did;
2198
Robert Love3a3b42b2009-11-03 11:47:39 -08002199 lport = ep->lp;
Robert Love42e9a922008-12-09 15:10:17 -08002200
Robert Love3a3b42b2009-11-03 11:47:39 -08002201 fp = fc_frame_alloc(lport, sizeof(*rrq));
Robert Love42e9a922008-12-09 15:10:17 -08002202 if (!fp)
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002203 goto retry;
2204
Robert Love42e9a922008-12-09 15:10:17 -08002205 rrq = fc_frame_payload_get(fp, sizeof(*rrq));
2206 memset(rrq, 0, sizeof(*rrq));
2207 rrq->rrq_cmd = ELS_RRQ;
2208 hton24(rrq->rrq_s_id, ep->sid);
2209 rrq->rrq_ox_id = htons(ep->oxid);
2210 rrq->rrq_rx_id = htons(ep->rxid);
2211
2212 did = ep->did;
2213 if (ep->esb_stat & ESB_ST_RESP)
2214 did = ep->sid;
2215
2216 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did,
Robert Love7b2787e2010-05-07 15:18:41 -07002217 lport->port_id, FC_TYPE_ELS,
Robert Love42e9a922008-12-09 15:10:17 -08002218 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
2219
Robert Love3a3b42b2009-11-03 11:47:39 -08002220 if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep,
2221 lport->e_d_tov))
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002222 return;
2223
2224retry:
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002225 FC_EXCH_DBG(ep, "exch: RRQ send failed\n");
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002226 spin_lock_bh(&ep->ex_lock);
2227 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) {
2228 spin_unlock_bh(&ep->ex_lock);
2229 /* drop hold for rec qual */
2230 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08002231 return;
2232 }
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002233 ep->esb_stat |= ESB_ST_REC_QUAL;
2234 fc_exch_timer_set_locked(ep, ep->r_a_tov);
2235 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08002236}
2237
Robert Love3a3b42b2009-11-03 11:47:39 -08002238/**
2239 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
Joe Eykholt922611562010-07-20 15:21:12 -07002240 * @fp: The RRQ frame, not freed here.
Robert Love42e9a922008-12-09 15:10:17 -08002241 */
Joe Eykholt922611562010-07-20 15:21:12 -07002242static void fc_exch_els_rrq(struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -08002243{
Joe Eykholt922611562010-07-20 15:21:12 -07002244 struct fc_lport *lport;
Vasu Dev3f127ad2009-10-21 16:27:33 -07002245 struct fc_exch *ep = NULL; /* request or subject exchange */
Robert Love42e9a922008-12-09 15:10:17 -08002246 struct fc_els_rrq *rp;
2247 u32 sid;
2248 u16 xid;
2249 enum fc_els_rjt_explan explan;
2250
Joe Eykholt922611562010-07-20 15:21:12 -07002251 lport = fr_dev(fp);
Robert Love42e9a922008-12-09 15:10:17 -08002252 rp = fc_frame_payload_get(fp, sizeof(*rp));
2253 explan = ELS_EXPL_INV_LEN;
2254 if (!rp)
2255 goto reject;
2256
2257 /*
2258 * lookup subject exchange.
2259 */
Robert Love42e9a922008-12-09 15:10:17 -08002260 sid = ntoh24(rp->rrq_s_id); /* subject source */
Joe Eykholt922611562010-07-20 15:21:12 -07002261 xid = fc_host_port_id(lport->host) == sid ?
2262 ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id);
2263 ep = fc_exch_lookup(lport, xid);
Robert Love42e9a922008-12-09 15:10:17 -08002264 explan = ELS_EXPL_OXID_RXID;
2265 if (!ep)
2266 goto reject;
2267 spin_lock_bh(&ep->ex_lock);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002268 FC_EXCH_DBG(ep, "RRQ request from %x: xid %x rxid %x oxid %x\n",
2269 sid, xid, ntohs(rp->rrq_rx_id), ntohs(rp->rrq_ox_id));
Robert Love42e9a922008-12-09 15:10:17 -08002270 if (ep->oxid != ntohs(rp->rrq_ox_id))
2271 goto unlock_reject;
2272 if (ep->rxid != ntohs(rp->rrq_rx_id) &&
2273 ep->rxid != FC_XID_UNKNOWN)
2274 goto unlock_reject;
2275 explan = ELS_EXPL_SID;
2276 if (ep->sid != sid)
2277 goto unlock_reject;
2278
2279 /*
2280 * Clear Recovery Qualifier state, and cancel timer if complete.
2281 */
2282 if (ep->esb_stat & ESB_ST_REC_QUAL) {
2283 ep->esb_stat &= ~ESB_ST_REC_QUAL;
2284 atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */
2285 }
Vasu Devb29a4f32012-07-06 10:40:10 -07002286 if (ep->esb_stat & ESB_ST_COMPLETE)
2287 fc_exch_timer_cancel(ep);
Robert Love42e9a922008-12-09 15:10:17 -08002288
2289 spin_unlock_bh(&ep->ex_lock);
2290
2291 /*
2292 * Send LS_ACC.
2293 */
Joe Eykholt922611562010-07-20 15:21:12 -07002294 fc_seq_ls_acc(fp);
Vasu Dev3f127ad2009-10-21 16:27:33 -07002295 goto out;
Robert Love42e9a922008-12-09 15:10:17 -08002296
2297unlock_reject:
2298 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08002299reject:
Joe Eykholt922611562010-07-20 15:21:12 -07002300 fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan);
Vasu Dev3f127ad2009-10-21 16:27:33 -07002301out:
Vasu Dev3f127ad2009-10-21 16:27:33 -07002302 if (ep)
2303 fc_exch_release(ep); /* drop hold from fc_exch_find */
Robert Love42e9a922008-12-09 15:10:17 -08002304}
2305
Robert Love3a3b42b2009-11-03 11:47:39 -08002306/**
Vasu Dev4e5fae72012-05-25 10:26:54 -07002307 * fc_exch_update_stats() - update exches stats to lport
2308 * @lport: The local port to update exchange manager stats
2309 */
2310void fc_exch_update_stats(struct fc_lport *lport)
2311{
2312 struct fc_host_statistics *st;
2313 struct fc_exch_mgr_anchor *ema;
2314 struct fc_exch_mgr *mp;
2315
2316 st = &lport->host_stats;
2317
2318 list_for_each_entry(ema, &lport->ema_list, ema_list) {
2319 mp = ema->mp;
2320 st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch);
2321 st->fc_no_free_exch_xid +=
2322 atomic_read(&mp->stats.no_free_exch_xid);
2323 st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found);
2324 st->fc_xid_busy += atomic_read(&mp->stats.xid_busy);
2325 st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found);
2326 st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp);
2327 }
2328}
2329EXPORT_SYMBOL(fc_exch_update_stats);
2330
2331/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002332 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
2333 * @lport: The local port to add the exchange manager to
2334 * @mp: The exchange manager to be added to the local port
2335 * @match: The match routine that indicates when this EM should be used
2336 */
Vasu Dev96316092009-07-29 17:05:00 -07002337struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
2338 struct fc_exch_mgr *mp,
2339 bool (*match)(struct fc_frame *))
2340{
2341 struct fc_exch_mgr_anchor *ema;
2342
2343 ema = kmalloc(sizeof(*ema), GFP_ATOMIC);
2344 if (!ema)
2345 return ema;
2346
2347 ema->mp = mp;
2348 ema->match = match;
2349 /* add EM anchor to EM anchors list */
2350 list_add_tail(&ema->ema_list, &lport->ema_list);
2351 kref_get(&mp->kref);
2352 return ema;
2353}
2354EXPORT_SYMBOL(fc_exch_mgr_add);
2355
Robert Love3a3b42b2009-11-03 11:47:39 -08002356/**
2357 * fc_exch_mgr_destroy() - Destroy an exchange manager
2358 * @kref: The reference to the EM to be destroyed
2359 */
Vasu Dev96316092009-07-29 17:05:00 -07002360static void fc_exch_mgr_destroy(struct kref *kref)
2361{
2362 struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref);
2363
Vasu Dev96316092009-07-29 17:05:00 -07002364 mempool_destroy(mp->ep_pool);
Vasu Deve4bc50b2009-08-25 13:58:47 -07002365 free_percpu(mp->pool);
Vasu Dev96316092009-07-29 17:05:00 -07002366 kfree(mp);
2367}
2368
Robert Love3a3b42b2009-11-03 11:47:39 -08002369/**
2370 * fc_exch_mgr_del() - Delete an EM from a local port's list
2371 * @ema: The exchange manager anchor identifying the EM to be deleted
2372 */
Vasu Dev96316092009-07-29 17:05:00 -07002373void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema)
2374{
2375 /* remove EM anchor from EM anchors list */
2376 list_del(&ema->ema_list);
2377 kref_put(&ema->mp->kref, fc_exch_mgr_destroy);
2378 kfree(ema);
2379}
2380EXPORT_SYMBOL(fc_exch_mgr_del);
2381
Chris Leech174e1eb2009-11-03 11:46:14 -08002382/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002383 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2384 * @src: Source lport to clone exchange managers from
2385 * @dst: New lport that takes references to all the exchange managers
Chris Leech174e1eb2009-11-03 11:46:14 -08002386 */
2387int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst)
2388{
2389 struct fc_exch_mgr_anchor *ema, *tmp;
2390
2391 list_for_each_entry(ema, &src->ema_list, ema_list) {
2392 if (!fc_exch_mgr_add(dst, ema->mp, ema->match))
2393 goto err;
2394 }
2395 return 0;
2396err:
2397 list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list)
2398 fc_exch_mgr_del(ema);
2399 return -ENOMEM;
2400}
Vasu Dev72fa3962011-02-25 15:03:01 -08002401EXPORT_SYMBOL(fc_exch_mgr_list_clone);
Chris Leech174e1eb2009-11-03 11:46:14 -08002402
Robert Love3a3b42b2009-11-03 11:47:39 -08002403/**
2404 * fc_exch_mgr_alloc() - Allocate an exchange manager
2405 * @lport: The local port that the new EM will be associated with
2406 * @class: The default FC class for new exchanges
2407 * @min_xid: The minimum XID for exchanges from the new EM
2408 * @max_xid: The maximum XID for exchanges from the new EM
2409 * @match: The match routine for the new EM
2410 */
2411struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport,
Robert Love42e9a922008-12-09 15:10:17 -08002412 enum fc_class class,
Vasu Dev52ff8782009-07-29 17:05:10 -07002413 u16 min_xid, u16 max_xid,
2414 bool (*match)(struct fc_frame *))
Robert Love42e9a922008-12-09 15:10:17 -08002415{
2416 struct fc_exch_mgr *mp;
Vasu Deve4bc50b2009-08-25 13:58:47 -07002417 u16 pool_exch_range;
2418 size_t pool_size;
2419 unsigned int cpu;
2420 struct fc_exch_pool *pool;
Robert Love42e9a922008-12-09 15:10:17 -08002421
Vasu Deve4bc50b2009-08-25 13:58:47 -07002422 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN ||
2423 (min_xid & fc_cpu_mask) != 0) {
Robert Love3a3b42b2009-11-03 11:47:39 -08002424 FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
Robert Love74147052009-06-10 15:31:10 -07002425 min_xid, max_xid);
Robert Love42e9a922008-12-09 15:10:17 -08002426 return NULL;
2427 }
2428
2429 /*
Vasu Devb2f00912009-08-25 13:58:53 -07002430 * allocate memory for EM
Robert Love42e9a922008-12-09 15:10:17 -08002431 */
Vasu Devb2f00912009-08-25 13:58:53 -07002432 mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC);
Robert Love42e9a922008-12-09 15:10:17 -08002433 if (!mp)
2434 return NULL;
2435
2436 mp->class = class;
Robert Love42e9a922008-12-09 15:10:17 -08002437 /* adjust em exch xid range for offload */
2438 mp->min_xid = min_xid;
Steven Clark011a9002012-03-09 14:50:30 -08002439
2440 /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */
2441 pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) /
2442 sizeof(struct fc_exch *);
2443 if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) {
2444 mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) +
2445 min_xid - 1;
2446 } else {
2447 mp->max_xid = max_xid;
2448 pool_exch_range = (mp->max_xid - mp->min_xid + 1) /
2449 (fc_cpu_mask + 1);
2450 }
Robert Love42e9a922008-12-09 15:10:17 -08002451
2452 mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
2453 if (!mp->ep_pool)
2454 goto free_mp;
2455
Vasu Deve4bc50b2009-08-25 13:58:47 -07002456 /*
2457 * Setup per cpu exch pool with entire exchange id range equally
2458 * divided across all cpus. The exch pointers array memory is
2459 * allocated for exch range per pool.
2460 */
Vasu Deve4bc50b2009-08-25 13:58:47 -07002461 mp->pool_max_index = pool_exch_range - 1;
2462
2463 /*
2464 * Allocate and initialize per cpu exch pool
2465 */
2466 pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *);
2467 mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool));
2468 if (!mp->pool)
2469 goto free_mempool;
2470 for_each_possible_cpu(cpu) {
2471 pool = per_cpu_ptr(mp->pool, cpu);
Vasu Devb6e3c842011-10-28 11:34:17 -07002472 pool->next_index = 0;
Hillf Danton2034c192010-11-30 16:18:17 -08002473 pool->left = FC_XID_UNKNOWN;
2474 pool->right = FC_XID_UNKNOWN;
Vasu Deve4bc50b2009-08-25 13:58:47 -07002475 spin_lock_init(&pool->lock);
2476 INIT_LIST_HEAD(&pool->ex_list);
2477 }
2478
Vasu Dev52ff8782009-07-29 17:05:10 -07002479 kref_init(&mp->kref);
Robert Love3a3b42b2009-11-03 11:47:39 -08002480 if (!fc_exch_mgr_add(lport, mp, match)) {
Vasu Deve4bc50b2009-08-25 13:58:47 -07002481 free_percpu(mp->pool);
2482 goto free_mempool;
Vasu Dev52ff8782009-07-29 17:05:10 -07002483 }
2484
2485 /*
2486 * Above kref_init() sets mp->kref to 1 and then
2487 * call to fc_exch_mgr_add incremented mp->kref again,
2488 * so adjust that extra increment.
2489 */
2490 kref_put(&mp->kref, fc_exch_mgr_destroy);
Robert Love42e9a922008-12-09 15:10:17 -08002491 return mp;
2492
Vasu Deve4bc50b2009-08-25 13:58:47 -07002493free_mempool:
2494 mempool_destroy(mp->ep_pool);
Robert Love42e9a922008-12-09 15:10:17 -08002495free_mp:
2496 kfree(mp);
2497 return NULL;
2498}
2499EXPORT_SYMBOL(fc_exch_mgr_alloc);
2500
Robert Love3a3b42b2009-11-03 11:47:39 -08002501/**
2502 * fc_exch_mgr_free() - Free all exchange managers on a local port
2503 * @lport: The local port whose EMs are to be freed
2504 */
Vasu Dev52ff8782009-07-29 17:05:10 -07002505void fc_exch_mgr_free(struct fc_lport *lport)
Robert Love42e9a922008-12-09 15:10:17 -08002506{
Vasu Dev52ff8782009-07-29 17:05:10 -07002507 struct fc_exch_mgr_anchor *ema, *next;
2508
Vasu Dev4ae1e192009-11-03 11:50:10 -08002509 flush_workqueue(fc_exch_workqueue);
Vasu Dev52ff8782009-07-29 17:05:10 -07002510 list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list)
2511 fc_exch_mgr_del(ema);
Robert Love42e9a922008-12-09 15:10:17 -08002512}
2513EXPORT_SYMBOL(fc_exch_mgr_free);
2514
Robert Love3a3b42b2009-11-03 11:47:39 -08002515/**
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002516 * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending
2517 * upon 'xid'.
2518 * @f_ctl: f_ctl
2519 * @lport: The local port the frame was received on
2520 * @fh: The received frame header
2521 */
2522static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl,
2523 struct fc_lport *lport,
2524 struct fc_frame_header *fh)
2525{
2526 struct fc_exch_mgr_anchor *ema;
2527 u16 xid;
2528
2529 if (f_ctl & FC_FC_EX_CTX)
2530 xid = ntohs(fh->fh_ox_id);
2531 else {
2532 xid = ntohs(fh->fh_rx_id);
2533 if (xid == FC_XID_UNKNOWN)
2534 return list_entry(lport->ema_list.prev,
2535 typeof(*ema), ema_list);
2536 }
2537
2538 list_for_each_entry(ema, &lport->ema_list, ema_list) {
2539 if ((xid >= ema->mp->min_xid) &&
2540 (xid <= ema->mp->max_xid))
2541 return ema;
2542 }
2543 return NULL;
2544}
2545/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002546 * fc_exch_recv() - Handler for received frames
2547 * @lport: The local port the frame was received on
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002548 * @fp: The received frame
Robert Love42e9a922008-12-09 15:10:17 -08002549 */
Robert Love3a3b42b2009-11-03 11:47:39 -08002550void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -08002551{
2552 struct fc_frame_header *fh = fc_frame_header_get(fp);
Vasu Dev52ff8782009-07-29 17:05:10 -07002553 struct fc_exch_mgr_anchor *ema;
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002554 u32 f_ctl;
Robert Love42e9a922008-12-09 15:10:17 -08002555
2556 /* lport lock ? */
Robert Love3a3b42b2009-11-03 11:47:39 -08002557 if (!lport || lport->state == LPORT_ST_DISABLED) {
2558 FC_LPORT_DBG(lport, "Receiving frames for an lport that "
Robert Love74147052009-06-10 15:31:10 -07002559 "has not been initialized correctly\n");
Robert Love42e9a922008-12-09 15:10:17 -08002560 fc_frame_free(fp);
2561 return;
2562 }
2563
Vasu Dev52ff8782009-07-29 17:05:10 -07002564 f_ctl = ntoh24(fh->fh_f_ctl);
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002565 ema = fc_find_ema(f_ctl, lport, fh);
2566 if (!ema) {
2567 FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor,"
2568 "fc_ctl <0x%x>, xid <0x%x>\n",
2569 f_ctl,
2570 (f_ctl & FC_FC_EX_CTX) ?
2571 ntohs(fh->fh_ox_id) :
2572 ntohs(fh->fh_rx_id));
2573 fc_frame_free(fp);
2574 return;
2575 }
Vasu Dev52ff8782009-07-29 17:05:10 -07002576
Robert Love42e9a922008-12-09 15:10:17 -08002577 /*
2578 * If frame is marked invalid, just drop it.
2579 */
Robert Love42e9a922008-12-09 15:10:17 -08002580 switch (fr_eof(fp)) {
2581 case FC_EOF_T:
2582 if (f_ctl & FC_FC_END_SEQ)
2583 skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl));
2584 /* fall through */
2585 case FC_EOF_N:
2586 if (fh->fh_type == FC_TYPE_BLS)
Vasu Dev52ff8782009-07-29 17:05:10 -07002587 fc_exch_recv_bls(ema->mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002588 else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
2589 FC_FC_EX_CTX)
Vasu Dev52ff8782009-07-29 17:05:10 -07002590 fc_exch_recv_seq_resp(ema->mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002591 else if (f_ctl & FC_FC_SEQ_CTX)
Vasu Dev52ff8782009-07-29 17:05:10 -07002592 fc_exch_recv_resp(ema->mp, fp);
Joe Eykholt922611562010-07-20 15:21:12 -07002593 else /* no EX_CTX and no SEQ_CTX */
Robert Love3a3b42b2009-11-03 11:47:39 -08002594 fc_exch_recv_req(lport, ema->mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002595 break;
2596 default:
Robert Love3a3b42b2009-11-03 11:47:39 -08002597 FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)",
2598 fr_eof(fp));
Robert Love42e9a922008-12-09 15:10:17 -08002599 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08002600 }
2601}
2602EXPORT_SYMBOL(fc_exch_recv);
2603
Robert Love3a3b42b2009-11-03 11:47:39 -08002604/**
2605 * fc_exch_init() - Initialize the exchange layer for a local port
2606 * @lport: The local port to initialize the exchange layer for
2607 */
2608int fc_exch_init(struct fc_lport *lport)
Robert Love42e9a922008-12-09 15:10:17 -08002609{
Robert Love3a3b42b2009-11-03 11:47:39 -08002610 if (!lport->tt.seq_start_next)
2611 lport->tt.seq_start_next = fc_seq_start_next;
Robert Love42e9a922008-12-09 15:10:17 -08002612
Joe Eykholt1a5c2d72011-01-28 16:04:08 -08002613 if (!lport->tt.seq_set_resp)
2614 lport->tt.seq_set_resp = fc_seq_set_resp;
2615
Robert Love3a3b42b2009-11-03 11:47:39 -08002616 if (!lport->tt.exch_seq_send)
2617 lport->tt.exch_seq_send = fc_exch_seq_send;
Robert Love42e9a922008-12-09 15:10:17 -08002618
Robert Love3a3b42b2009-11-03 11:47:39 -08002619 if (!lport->tt.seq_send)
2620 lport->tt.seq_send = fc_seq_send;
Robert Love42e9a922008-12-09 15:10:17 -08002621
Robert Love3a3b42b2009-11-03 11:47:39 -08002622 if (!lport->tt.seq_els_rsp_send)
2623 lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send;
Robert Love42e9a922008-12-09 15:10:17 -08002624
Robert Love3a3b42b2009-11-03 11:47:39 -08002625 if (!lport->tt.exch_done)
2626 lport->tt.exch_done = fc_exch_done;
Robert Love42e9a922008-12-09 15:10:17 -08002627
Robert Love3a3b42b2009-11-03 11:47:39 -08002628 if (!lport->tt.exch_mgr_reset)
2629 lport->tt.exch_mgr_reset = fc_exch_mgr_reset;
Robert Love42e9a922008-12-09 15:10:17 -08002630
Robert Love3a3b42b2009-11-03 11:47:39 -08002631 if (!lport->tt.seq_exch_abort)
2632 lport->tt.seq_exch_abort = fc_seq_exch_abort;
Robert Love42e9a922008-12-09 15:10:17 -08002633
Joe Eykholt239e8102010-07-20 15:21:07 -07002634 if (!lport->tt.seq_assign)
2635 lport->tt.seq_assign = fc_seq_assign;
2636
Joe Eykholt62bdb642011-01-28 16:04:34 -08002637 if (!lport->tt.seq_release)
2638 lport->tt.seq_release = fc_seq_release;
2639
Vasu Dev89f19a52009-10-21 16:27:28 -07002640 return 0;
2641}
2642EXPORT_SYMBOL(fc_exch_init);
2643
2644/**
2645 * fc_setup_exch_mgr() - Setup an exchange manager
2646 */
Randy Dunlap55204902011-01-28 16:03:57 -08002647int fc_setup_exch_mgr(void)
Vasu Dev89f19a52009-10-21 16:27:28 -07002648{
2649 fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch),
2650 0, SLAB_HWCACHE_ALIGN, NULL);
2651 if (!fc_em_cachep)
2652 return -ENOMEM;
2653
Vasu Deve4bc50b2009-08-25 13:58:47 -07002654 /*
2655 * Initialize fc_cpu_mask and fc_cpu_order. The
2656 * fc_cpu_mask is set for nr_cpu_ids rounded up
2657 * to order of 2's * power and order is stored
2658 * in fc_cpu_order as this is later required in
2659 * mapping between an exch id and exch array index
2660 * in per cpu exch pool.
2661 *
2662 * This round up is required to align fc_cpu_mask
2663 * to exchange id's lower bits such that all incoming
2664 * frames of an exchange gets delivered to the same
2665 * cpu on which exchange originated by simple bitwise
2666 * AND operation between fc_cpu_mask and exchange id.
2667 */
Bart Van Asschea84ea8c2013-08-14 15:33:35 +00002668 fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids));
2669 fc_cpu_mask = (1 << fc_cpu_order) - 1;
Vasu Deve4bc50b2009-08-25 13:58:47 -07002670
Vasu Dev4ae1e192009-11-03 11:50:10 -08002671 fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue");
2672 if (!fc_exch_workqueue)
Hillf Danton6f06e3a2011-07-27 15:10:34 -07002673 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08002674 return 0;
Hillf Danton6f06e3a2011-07-27 15:10:34 -07002675err:
2676 kmem_cache_destroy(fc_em_cachep);
2677 return -ENOMEM;
Robert Love42e9a922008-12-09 15:10:17 -08002678}
Robert Love42e9a922008-12-09 15:10:17 -08002679
Robert Love3a3b42b2009-11-03 11:47:39 -08002680/**
2681 * fc_destroy_exch_mgr() - Destroy an exchange manager
2682 */
Randy Dunlap55204902011-01-28 16:03:57 -08002683void fc_destroy_exch_mgr(void)
Robert Love42e9a922008-12-09 15:10:17 -08002684{
Vasu Dev4ae1e192009-11-03 11:50:10 -08002685 destroy_workqueue(fc_exch_workqueue);
Robert Love42e9a922008-12-09 15:10:17 -08002686 kmem_cache_destroy(fc_em_cachep);
2687}