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42e9a92f RL |
1 | /* |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
42e9a92f RL |
28 | #include <linux/err.h> |
29 | ||
30 | #include <scsi/fc/fc_fc2.h> | |
31 | ||
32 | #include <scsi/libfc.h> | |
33 | #include <scsi/fc_encode.h> | |
34 | ||
8866a5d9 RL |
35 | #include "fc_libfc.h" |
36 | ||
e4bc50be VD |
37 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
38 | EXPORT_SYMBOL(fc_cpu_mask); | |
39 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ | |
3a3b42bf | 40 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
55204909 | 41 | static struct workqueue_struct *fc_exch_workqueue; |
42e9a92f RL |
42 | |
43 | /* | |
44 | * Structure and function definitions for managing Fibre Channel Exchanges | |
45 | * and Sequences. | |
46 | * | |
47 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
48 | * | |
49 | * fc_exch_mgr holds the exchange state for an N port | |
50 | * | |
51 | * fc_exch holds state for one exchange and links to its active sequence. | |
52 | * | |
53 | * fc_seq holds the state for an individual sequence. | |
54 | */ | |
55 | ||
3a3b42bf RL |
56 | /** |
57 | * struct fc_exch_pool - Per cpu exchange pool | |
58 | * @next_index: Next possible free exchange index | |
59 | * @total_exches: Total allocated exchanges | |
60 | * @lock: Exch pool lock | |
61 | * @ex_list: List of exchanges | |
e4bc50be VD |
62 | * |
63 | * This structure manages per cpu exchanges in array of exchange pointers. | |
64 | * This array is allocated followed by struct fc_exch_pool memory for | |
65 | * assigned range of exchanges to per cpu pool. | |
66 | */ | |
67 | struct fc_exch_pool { | |
3a3b42bf RL |
68 | u16 next_index; |
69 | u16 total_exches; | |
2034c19c HD |
70 | |
71 | /* two cache of free slot in exch array */ | |
72 | u16 left; | |
73 | u16 right; | |
74 | ||
3a3b42bf RL |
75 | spinlock_t lock; |
76 | struct list_head ex_list; | |
e4bc50be VD |
77 | }; |
78 | ||
3a3b42bf RL |
79 | /** |
80 | * struct fc_exch_mgr - The Exchange Manager (EM). | |
81 | * @class: Default class for new sequences | |
82 | * @kref: Reference counter | |
83 | * @min_xid: Minimum exchange ID | |
84 | * @max_xid: Maximum exchange ID | |
85 | * @ep_pool: Reserved exchange pointers | |
86 | * @pool_max_index: Max exch array index in exch pool | |
87 | * @pool: Per cpu exch pool | |
88 | * @stats: Statistics structure | |
42e9a92f RL |
89 | * |
90 | * This structure is the center for creating exchanges and sequences. | |
91 | * It manages the allocation of exchange IDs. | |
92 | */ | |
93 | struct fc_exch_mgr { | |
3a3b42bf RL |
94 | enum fc_class class; |
95 | struct kref kref; | |
96 | u16 min_xid; | |
97 | u16 max_xid; | |
98 | mempool_t *ep_pool; | |
99 | u16 pool_max_index; | |
100 | struct fc_exch_pool *pool; | |
42e9a92f RL |
101 | |
102 | /* | |
103 | * currently exchange mgr stats are updated but not used. | |
104 | * either stats can be expose via sysfs or remove them | |
105 | * all together if not used XXX | |
106 | */ | |
107 | struct { | |
108 | atomic_t no_free_exch; | |
109 | atomic_t no_free_exch_xid; | |
110 | atomic_t xid_not_found; | |
111 | atomic_t xid_busy; | |
112 | atomic_t seq_not_found; | |
113 | atomic_t non_bls_resp; | |
114 | } stats; | |
42e9a92f | 115 | }; |
42e9a92f | 116 | |
3a3b42bf RL |
117 | /** |
118 | * struct fc_exch_mgr_anchor - primary structure for list of EMs | |
119 | * @ema_list: Exchange Manager Anchor list | |
120 | * @mp: Exchange Manager associated with this anchor | |
121 | * @match: Routine to determine if this anchor's EM should be used | |
122 | * | |
123 | * When walking the list of anchors the match routine will be called | |
124 | * for each anchor to determine if that EM should be used. The last | |
125 | * anchor in the list will always match to handle any exchanges not | |
126 | * handled by other EMs. The non-default EMs would be added to the | |
127 | * anchor list by HW that provides FCoE offloads. | |
128 | */ | |
96316099 VD |
129 | struct fc_exch_mgr_anchor { |
130 | struct list_head ema_list; | |
131 | struct fc_exch_mgr *mp; | |
132 | bool (*match)(struct fc_frame *); | |
133 | }; | |
134 | ||
42e9a92f | 135 | static void fc_exch_rrq(struct fc_exch *); |
92261156 JE |
136 | static void fc_seq_ls_acc(struct fc_frame *); |
137 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, | |
42e9a92f | 138 | enum fc_els_rjt_explan); |
92261156 JE |
139 | static void fc_exch_els_rec(struct fc_frame *); |
140 | static void fc_exch_els_rrq(struct fc_frame *); | |
42e9a92f RL |
141 | |
142 | /* | |
143 | * Internal implementation notes. | |
144 | * | |
145 | * The exchange manager is one by default in libfc but LLD may choose | |
146 | * to have one per CPU. The sequence manager is one per exchange manager | |
147 | * and currently never separated. | |
148 | * | |
149 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
150 | * assigned by the Sequence Initiator that shall be unique for a specific | |
151 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
152 | * qualified by exchange ID, which one might think it would be. | |
153 | * In practice this limits the number of open sequences and exchanges to 256 | |
154 | * per session. For most targets we could treat this limit as per exchange. | |
155 | * | |
156 | * The exchange and its sequence are freed when the last sequence is received. | |
157 | * It's possible for the remote port to leave an exchange open without | |
158 | * sending any sequences. | |
159 | * | |
160 | * Notes on reference counts: | |
161 | * | |
162 | * Exchanges are reference counted and exchange gets freed when the reference | |
163 | * count becomes zero. | |
164 | * | |
165 | * Timeouts: | |
166 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
167 | * | |
168 | * Sequence event handling: | |
169 | * | |
170 | * The following events may occur on initiator sequences: | |
171 | * | |
172 | * Send. | |
173 | * For now, the whole thing is sent. | |
174 | * Receive ACK | |
175 | * This applies only to class F. | |
176 | * The sequence is marked complete. | |
177 | * ULP completion. | |
178 | * The upper layer calls fc_exch_done() when done | |
179 | * with exchange and sequence tuple. | |
180 | * RX-inferred completion. | |
181 | * When we receive the next sequence on the same exchange, we can | |
182 | * retire the previous sequence ID. (XXX not implemented). | |
183 | * Timeout. | |
184 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
185 | * E_D_TOV causes abort and calls upper layer response handler | |
186 | * with FC_EX_TIMEOUT error. | |
187 | * Receive RJT | |
188 | * XXX defer. | |
189 | * Send ABTS | |
190 | * On timeout. | |
191 | * | |
192 | * The following events may occur on recipient sequences: | |
193 | * | |
194 | * Receive | |
195 | * Allocate sequence for first frame received. | |
196 | * Hold during receive handler. | |
197 | * Release when final frame received. | |
198 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
199 | * Receive ABTS | |
200 | * Deallocate sequence | |
201 | * Send RJT | |
202 | * Deallocate | |
203 | * | |
204 | * For now, we neglect conditions where only part of a sequence was | |
205 | * received or transmitted, or where out-of-order receipt is detected. | |
206 | */ | |
207 | ||
208 | /* | |
209 | * Locking notes: | |
210 | * | |
211 | * The EM code run in a per-CPU worker thread. | |
212 | * | |
213 | * To protect against concurrency between a worker thread code and timers, | |
214 | * sequence allocation and deallocation must be locked. | |
215 | * - exchange refcnt can be done atomicly without locks. | |
216 | * - sequence allocation must be locked by exch lock. | |
b2f0091f VD |
217 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
218 | * EM pool lock must be taken before the ex_lock. | |
42e9a92f RL |
219 | */ |
220 | ||
221 | /* | |
222 | * opcode names for debugging. | |
223 | */ | |
224 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
225 | ||
3a3b42bf RL |
226 | /** |
227 | * fc_exch_name_lookup() - Lookup name by opcode | |
228 | * @op: Opcode to be looked up | |
229 | * @table: Opcode/name table | |
230 | * @max_index: Index not to be exceeded | |
231 | * | |
232 | * This routine is used to determine a human-readable string identifying | |
233 | * a R_CTL opcode. | |
234 | */ | |
42e9a92f RL |
235 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
236 | unsigned int max_index) | |
237 | { | |
238 | const char *name = NULL; | |
239 | ||
240 | if (op < max_index) | |
241 | name = table[op]; | |
242 | if (!name) | |
243 | name = "unknown"; | |
244 | return name; | |
245 | } | |
246 | ||
3a3b42bf RL |
247 | /** |
248 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() | |
249 | * @op: The opcode to be looked up | |
250 | */ | |
42e9a92f RL |
251 | static const char *fc_exch_rctl_name(unsigned int op) |
252 | { | |
253 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
7156fffa | 254 | ARRAY_SIZE(fc_exch_rctl_names)); |
42e9a92f RL |
255 | } |
256 | ||
3a3b42bf RL |
257 | /** |
258 | * fc_exch_hold() - Increment an exchange's reference count | |
259 | * @ep: Echange to be held | |
42e9a92f | 260 | */ |
3a3b42bf | 261 | static inline void fc_exch_hold(struct fc_exch *ep) |
42e9a92f RL |
262 | { |
263 | atomic_inc(&ep->ex_refcnt); | |
264 | } | |
265 | ||
3a3b42bf RL |
266 | /** |
267 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields | |
268 | * and determine SOF and EOF. | |
269 | * @ep: The exchange to that will use the header | |
270 | * @fp: The frame whose header is to be modified | |
271 | * @f_ctl: F_CTL bits that will be used for the frame header | |
272 | * | |
273 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, | |
274 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. | |
42e9a92f RL |
275 | */ |
276 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
277 | u32 f_ctl) | |
278 | { | |
279 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
280 | u16 fill; | |
281 | ||
282 | fr_sof(fp) = ep->class; | |
283 | if (ep->seq.cnt) | |
284 | fr_sof(fp) = fc_sof_normal(ep->class); | |
285 | ||
286 | if (f_ctl & FC_FC_END_SEQ) { | |
287 | fr_eof(fp) = FC_EOF_T; | |
288 | if (fc_sof_needs_ack(ep->class)) | |
289 | fr_eof(fp) = FC_EOF_N; | |
290 | /* | |
3a3b42bf | 291 | * From F_CTL. |
42e9a92f RL |
292 | * The number of fill bytes to make the length a 4-byte |
293 | * multiple is the low order 2-bits of the f_ctl. | |
294 | * The fill itself will have been cleared by the frame | |
295 | * allocation. | |
296 | * After this, the length will be even, as expected by | |
297 | * the transport. | |
298 | */ | |
299 | fill = fr_len(fp) & 3; | |
300 | if (fill) { | |
301 | fill = 4 - fill; | |
302 | /* TODO, this may be a problem with fragmented skb */ | |
303 | skb_put(fp_skb(fp), fill); | |
304 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
305 | } | |
306 | } else { | |
307 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
308 | fr_eof(fp) = FC_EOF_N; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Initialize remainig fh fields | |
313 | * from fc_fill_fc_hdr | |
314 | */ | |
315 | fh->fh_ox_id = htons(ep->oxid); | |
316 | fh->fh_rx_id = htons(ep->rxid); | |
317 | fh->fh_seq_id = ep->seq.id; | |
318 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
319 | } | |
320 | ||
3a3b42bf RL |
321 | /** |
322 | * fc_exch_release() - Decrement an exchange's reference count | |
323 | * @ep: Exchange to be released | |
324 | * | |
325 | * If the reference count reaches zero and the exchange is complete, | |
326 | * it is freed. | |
42e9a92f RL |
327 | */ |
328 | static void fc_exch_release(struct fc_exch *ep) | |
329 | { | |
330 | struct fc_exch_mgr *mp; | |
331 | ||
332 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
333 | mp = ep->em; | |
334 | if (ep->destructor) | |
335 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 336 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
337 | mempool_free(ep, mp->ep_pool); |
338 | } | |
339 | } | |
340 | ||
3a3b42bf RL |
341 | /** |
342 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held | |
343 | * @ep: The exchange that is complete | |
344 | */ | |
42e9a92f RL |
345 | static int fc_exch_done_locked(struct fc_exch *ep) |
346 | { | |
347 | int rc = 1; | |
348 | ||
349 | /* | |
350 | * We must check for completion in case there are two threads | |
351 | * tyring to complete this. But the rrq code will reuse the | |
352 | * ep, and in that case we only clear the resp and set it as | |
353 | * complete, so it can be reused by the timer to send the rrq. | |
354 | */ | |
355 | ep->resp = NULL; | |
356 | if (ep->state & FC_EX_DONE) | |
357 | return rc; | |
358 | ep->esb_stat |= ESB_ST_COMPLETE; | |
359 | ||
360 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
361 | ep->state |= FC_EX_DONE; | |
362 | if (cancel_delayed_work(&ep->timeout_work)) | |
363 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
364 | rc = 0; | |
365 | } | |
366 | return rc; | |
367 | } | |
368 | ||
3a3b42bf RL |
369 | /** |
370 | * fc_exch_ptr_get() - Return an exchange from an exchange pool | |
371 | * @pool: Exchange Pool to get an exchange from | |
372 | * @index: Index of the exchange within the pool | |
373 | * | |
374 | * Use the index to get an exchange from within an exchange pool. exches | |
375 | * will point to an array of exchange pointers. The index will select | |
376 | * the exchange within the array. | |
377 | */ | |
e4bc50be VD |
378 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
379 | u16 index) | |
380 | { | |
381 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); | |
382 | return exches[index]; | |
383 | } | |
384 | ||
3a3b42bf RL |
385 | /** |
386 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool | |
387 | * @pool: The pool to assign the exchange to | |
388 | * @index: The index in the pool where the exchange will be assigned | |
389 | * @ep: The exchange to assign to the pool | |
390 | */ | |
e4bc50be VD |
391 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, |
392 | struct fc_exch *ep) | |
393 | { | |
394 | ((struct fc_exch **)(pool + 1))[index] = ep; | |
395 | } | |
396 | ||
3a3b42bf RL |
397 | /** |
398 | * fc_exch_delete() - Delete an exchange | |
399 | * @ep: The exchange to be deleted | |
400 | */ | |
b2f0091f | 401 | static void fc_exch_delete(struct fc_exch *ep) |
42e9a92f | 402 | { |
b2f0091f | 403 | struct fc_exch_pool *pool; |
2034c19c | 404 | u16 index; |
42e9a92f | 405 | |
b2f0091f VD |
406 | pool = ep->pool; |
407 | spin_lock_bh(&pool->lock); | |
408 | WARN_ON(pool->total_exches <= 0); | |
409 | pool->total_exches--; | |
2034c19c HD |
410 | |
411 | /* update cache of free slot */ | |
412 | index = (ep->xid - ep->em->min_xid) >> fc_cpu_order; | |
413 | if (pool->left == FC_XID_UNKNOWN) | |
414 | pool->left = index; | |
415 | else if (pool->right == FC_XID_UNKNOWN) | |
416 | pool->right = index; | |
417 | else | |
418 | pool->next_index = index; | |
419 | ||
420 | fc_exch_ptr_set(pool, index, NULL); | |
42e9a92f | 421 | list_del(&ep->ex_list); |
b2f0091f | 422 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
423 | fc_exch_release(ep); /* drop hold for exch in mp */ |
424 | } | |
425 | ||
3a3b42bf RL |
426 | /** |
427 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the | |
428 | * the exchange lock held | |
429 | * @ep: The exchange whose timer will start | |
430 | * @timer_msec: The timeout period | |
431 | * | |
432 | * Used for upper level protocols to time out the exchange. | |
433 | * The timer is cancelled when it fires or when the exchange completes. | |
42e9a92f RL |
434 | */ |
435 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
436 | unsigned int timer_msec) | |
437 | { | |
438 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
439 | return; | |
440 | ||
cd305ce4 | 441 | FC_EXCH_DBG(ep, "Exchange timer armed\n"); |
7414705e | 442 | |
4ae1e19f VD |
443 | if (queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, |
444 | msecs_to_jiffies(timer_msec))) | |
42e9a92f RL |
445 | fc_exch_hold(ep); /* hold for timer */ |
446 | } | |
447 | ||
3a3b42bf RL |
448 | /** |
449 | * fc_exch_timer_set() - Lock the exchange and set the timer | |
450 | * @ep: The exchange whose timer will start | |
451 | * @timer_msec: The timeout period | |
42e9a92f RL |
452 | */ |
453 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
454 | { | |
455 | spin_lock_bh(&ep->ex_lock); | |
456 | fc_exch_timer_set_locked(ep, timer_msec); | |
457 | spin_unlock_bh(&ep->ex_lock); | |
458 | } | |
459 | ||
1a7b75ae | 460 | /** |
3a3b42bf RL |
461 | * fc_seq_send() - Send a frame using existing sequence/exchange pair |
462 | * @lport: The local port that the exchange will be sent on | |
463 | * @sp: The sequence to be sent | |
464 | * @fp: The frame to be sent on the exchange | |
1a7b75ae | 465 | */ |
3a3b42bf | 466 | static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, |
1a7b75ae RL |
467 | struct fc_frame *fp) |
468 | { | |
469 | struct fc_exch *ep; | |
470 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
471 | int error; | |
3a3b42bf | 472 | u32 f_ctl; |
1a7b75ae RL |
473 | |
474 | ep = fc_seq_exch(sp); | |
475 | WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT); | |
476 | ||
477 | f_ctl = ntoh24(fh->fh_f_ctl); | |
478 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
f60e12e9 | 479 | fr_encaps(fp) = ep->encaps; |
1a7b75ae RL |
480 | |
481 | /* | |
482 | * update sequence count if this frame is carrying | |
483 | * multiple FC frames when sequence offload is enabled | |
484 | * by LLD. | |
485 | */ | |
486 | if (fr_max_payload(fp)) | |
487 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
488 | fr_max_payload(fp)); | |
489 | else | |
490 | sp->cnt++; | |
491 | ||
492 | /* | |
493 | * Send the frame. | |
494 | */ | |
3a3b42bf | 495 | error = lport->tt.frame_send(lport, fp); |
1a7b75ae RL |
496 | |
497 | /* | |
498 | * Update the exchange and sequence flags, | |
499 | * assuming all frames for the sequence have been sent. | |
500 | * We can only be called to send once for each sequence. | |
501 | */ | |
502 | spin_lock_bh(&ep->ex_lock); | |
503 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ | |
cc3593d3 | 504 | if (f_ctl & FC_FC_SEQ_INIT) |
1a7b75ae RL |
505 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
506 | spin_unlock_bh(&ep->ex_lock); | |
507 | return error; | |
508 | } | |
509 | ||
510 | /** | |
3a3b42bf RL |
511 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
512 | * @ep: The exchange to allocate a new sequence for | |
513 | * @seq_id: The sequence ID to be used | |
1a7b75ae RL |
514 | * |
515 | * We don't support multiple originated sequences on the same exchange. | |
516 | * By implication, any previously originated sequence on this exchange | |
517 | * is complete, and we reallocate the same sequence. | |
518 | */ | |
519 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
520 | { | |
521 | struct fc_seq *sp; | |
522 | ||
523 | sp = &ep->seq; | |
524 | sp->ssb_stat = 0; | |
525 | sp->cnt = 0; | |
526 | sp->id = seq_id; | |
527 | return sp; | |
528 | } | |
529 | ||
3a3b42bf RL |
530 | /** |
531 | * fc_seq_start_next_locked() - Allocate a new sequence on the same | |
532 | * exchange as the supplied sequence | |
533 | * @sp: The sequence/exchange to get a new sequence for | |
534 | */ | |
1a7b75ae RL |
535 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
536 | { | |
537 | struct fc_exch *ep = fc_seq_exch(sp); | |
538 | ||
539 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
540 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", | |
541 | ep->f_ctl, sp->id); | |
542 | return sp; | |
543 | } | |
544 | ||
545 | /** | |
3a3b42bf RL |
546 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
547 | * for a given sequence/exchange pair | |
548 | * @sp: The sequence/exchange to get a new exchange for | |
1a7b75ae RL |
549 | */ |
550 | static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
551 | { | |
552 | struct fc_exch *ep = fc_seq_exch(sp); | |
553 | ||
554 | spin_lock_bh(&ep->ex_lock); | |
555 | sp = fc_seq_start_next_locked(sp); | |
556 | spin_unlock_bh(&ep->ex_lock); | |
557 | ||
558 | return sp; | |
559 | } | |
560 | ||
1a5c2d7e JE |
561 | /* |
562 | * Set the response handler for the exchange associated with a sequence. | |
563 | */ | |
564 | static void fc_seq_set_resp(struct fc_seq *sp, | |
565 | void (*resp)(struct fc_seq *, struct fc_frame *, | |
566 | void *), | |
567 | void *arg) | |
568 | { | |
569 | struct fc_exch *ep = fc_seq_exch(sp); | |
570 | ||
571 | spin_lock_bh(&ep->ex_lock); | |
572 | ep->resp = resp; | |
573 | ep->arg = arg; | |
574 | spin_unlock_bh(&ep->ex_lock); | |
575 | } | |
576 | ||
1a7b75ae | 577 | /** |
3a3b42bf RL |
578 | * fc_seq_exch_abort() - Abort an exchange and sequence |
579 | * @req_sp: The sequence to be aborted | |
580 | * @timer_msec: The period of time to wait before aborting | |
581 | * | |
582 | * Generally called because of a timeout or an abort from the upper layer. | |
1a7b75ae RL |
583 | */ |
584 | static int fc_seq_exch_abort(const struct fc_seq *req_sp, | |
585 | unsigned int timer_msec) | |
42e9a92f RL |
586 | { |
587 | struct fc_seq *sp; | |
588 | struct fc_exch *ep; | |
589 | struct fc_frame *fp; | |
590 | int error; | |
591 | ||
592 | ep = fc_seq_exch(req_sp); | |
593 | ||
594 | spin_lock_bh(&ep->ex_lock); | |
595 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || | |
596 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) { | |
597 | spin_unlock_bh(&ep->ex_lock); | |
598 | return -ENXIO; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Send the abort on a new sequence if possible. | |
603 | */ | |
604 | sp = fc_seq_start_next_locked(&ep->seq); | |
605 | if (!sp) { | |
606 | spin_unlock_bh(&ep->ex_lock); | |
607 | return -ENOMEM; | |
608 | } | |
609 | ||
610 | ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL; | |
611 | if (timer_msec) | |
612 | fc_exch_timer_set_locked(ep, timer_msec); | |
613 | spin_unlock_bh(&ep->ex_lock); | |
614 | ||
615 | /* | |
616 | * If not logged into the fabric, don't send ABTS but leave | |
617 | * sequence active until next timeout. | |
618 | */ | |
619 | if (!ep->sid) | |
620 | return 0; | |
621 | ||
622 | /* | |
623 | * Send an abort for the sequence that timed out. | |
624 | */ | |
625 | fp = fc_frame_alloc(ep->lp, 0); | |
626 | if (fp) { | |
627 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
628 | FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
629 | error = fc_seq_send(ep->lp, sp, fp); | |
630 | } else | |
631 | error = -ENOBUFS; | |
632 | return error; | |
633 | } | |
42e9a92f | 634 | |
3a3b42bf RL |
635 | /** |
636 | * fc_exch_timeout() - Handle exchange timer expiration | |
637 | * @work: The work_struct identifying the exchange that timed out | |
42e9a92f RL |
638 | */ |
639 | static void fc_exch_timeout(struct work_struct *work) | |
640 | { | |
641 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
642 | timeout_work.work); | |
643 | struct fc_seq *sp = &ep->seq; | |
644 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
645 | void *arg; | |
646 | u32 e_stat; | |
647 | int rc = 1; | |
648 | ||
cd305ce4 RL |
649 | FC_EXCH_DBG(ep, "Exchange timed out\n"); |
650 | ||
42e9a92f RL |
651 | spin_lock_bh(&ep->ex_lock); |
652 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
653 | goto unlock; | |
654 | ||
655 | e_stat = ep->esb_stat; | |
656 | if (e_stat & ESB_ST_COMPLETE) { | |
657 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 658 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
659 | if (e_stat & ESB_ST_REC_QUAL) |
660 | fc_exch_rrq(ep); | |
42e9a92f RL |
661 | goto done; |
662 | } else { | |
663 | resp = ep->resp; | |
664 | arg = ep->arg; | |
665 | ep->resp = NULL; | |
666 | if (e_stat & ESB_ST_ABNORMAL) | |
667 | rc = fc_exch_done_locked(ep); | |
668 | spin_unlock_bh(&ep->ex_lock); | |
f3162483 PN |
669 | if (!rc) |
670 | fc_exch_delete(ep); | |
42e9a92f RL |
671 | if (resp) |
672 | resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg); | |
673 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); | |
674 | goto done; | |
675 | } | |
676 | unlock: | |
677 | spin_unlock_bh(&ep->ex_lock); | |
678 | done: | |
679 | /* | |
680 | * This release matches the hold taken when the timer was set. | |
681 | */ | |
682 | fc_exch_release(ep); | |
683 | } | |
684 | ||
52ff878c | 685 | /** |
3a3b42bf RL |
686 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
687 | * @lport: The local port that the exchange is for | |
688 | * @mp: The exchange manager that will allocate the exchange | |
42e9a92f | 689 | * |
d7179680 | 690 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 691 | */ |
52ff878c | 692 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 693 | struct fc_exch_mgr *mp) |
42e9a92f RL |
694 | { |
695 | struct fc_exch *ep; | |
b2f0091f VD |
696 | unsigned int cpu; |
697 | u16 index; | |
698 | struct fc_exch_pool *pool; | |
42e9a92f RL |
699 | |
700 | /* allocate memory for exchange */ | |
701 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
702 | if (!ep) { | |
703 | atomic_inc(&mp->stats.no_free_exch); | |
704 | goto out; | |
705 | } | |
706 | memset(ep, 0, sizeof(*ep)); | |
707 | ||
f018b73a | 708 | cpu = get_cpu(); |
b2f0091f VD |
709 | pool = per_cpu_ptr(mp->pool, cpu); |
710 | spin_lock_bh(&pool->lock); | |
f018b73a | 711 | put_cpu(); |
2034c19c HD |
712 | |
713 | /* peek cache of free slot */ | |
714 | if (pool->left != FC_XID_UNKNOWN) { | |
715 | index = pool->left; | |
716 | pool->left = FC_XID_UNKNOWN; | |
717 | goto hit; | |
718 | } | |
719 | if (pool->right != FC_XID_UNKNOWN) { | |
720 | index = pool->right; | |
721 | pool->right = FC_XID_UNKNOWN; | |
722 | goto hit; | |
723 | } | |
724 | ||
b2f0091f VD |
725 | index = pool->next_index; |
726 | /* allocate new exch from pool */ | |
727 | while (fc_exch_ptr_get(pool, index)) { | |
728 | index = index == mp->pool_max_index ? 0 : index + 1; | |
729 | if (index == pool->next_index) | |
42e9a92f | 730 | goto err; |
42e9a92f | 731 | } |
b2f0091f | 732 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
2034c19c | 733 | hit: |
42e9a92f RL |
734 | fc_exch_hold(ep); /* hold for exch in mp */ |
735 | spin_lock_init(&ep->ex_lock); | |
736 | /* | |
737 | * Hold exch lock for caller to prevent fc_exch_reset() | |
738 | * from releasing exch while fc_exch_alloc() caller is | |
739 | * still working on exch. | |
740 | */ | |
741 | spin_lock_bh(&ep->ex_lock); | |
742 | ||
b2f0091f VD |
743 | fc_exch_ptr_set(pool, index, ep); |
744 | list_add_tail(&ep->ex_list, &pool->ex_list); | |
42e9a92f | 745 | fc_seq_alloc(ep, ep->seq_id++); |
b2f0091f VD |
746 | pool->total_exches++; |
747 | spin_unlock_bh(&pool->lock); | |
42e9a92f RL |
748 | |
749 | /* | |
750 | * update exchange | |
751 | */ | |
b2f0091f | 752 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
42e9a92f | 753 | ep->em = mp; |
b2f0091f | 754 | ep->pool = pool; |
52ff878c | 755 | ep->lp = lport; |
42e9a92f RL |
756 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
757 | ep->rxid = FC_XID_UNKNOWN; | |
758 | ep->class = mp->class; | |
759 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); | |
760 | out: | |
761 | return ep; | |
762 | err: | |
b2f0091f | 763 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
764 | atomic_inc(&mp->stats.no_free_exch_xid); |
765 | mempool_free(ep, mp->ep_pool); | |
766 | return NULL; | |
767 | } | |
52ff878c VD |
768 | |
769 | /** | |
3a3b42bf RL |
770 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
771 | * local port's list of EMs. | |
772 | * @lport: The local port that will own the exchange | |
773 | * @fp: The FC frame that the exchange will be for | |
52ff878c | 774 | * |
3a3b42bf RL |
775 | * This function walks the list of exchange manager(EM) |
776 | * anchors to select an EM for a new exchange allocation. The | |
777 | * EM is selected when a NULL match function pointer is encountered | |
778 | * or when a call to a match function returns true. | |
52ff878c | 779 | */ |
3e22760d VD |
780 | static inline struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
781 | struct fc_frame *fp) | |
52ff878c VD |
782 | { |
783 | struct fc_exch_mgr_anchor *ema; | |
52ff878c | 784 | |
3e22760d VD |
785 | list_for_each_entry(ema, &lport->ema_list, ema_list) |
786 | if (!ema->match || ema->match(fp)) | |
787 | return fc_exch_em_alloc(lport, ema->mp); | |
52ff878c VD |
788 | return NULL; |
789 | } | |
42e9a92f | 790 | |
3a3b42bf RL |
791 | /** |
792 | * fc_exch_find() - Lookup and hold an exchange | |
793 | * @mp: The exchange manager to lookup the exchange from | |
794 | * @xid: The XID of the exchange to look up | |
42e9a92f RL |
795 | */ |
796 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
797 | { | |
b2f0091f | 798 | struct fc_exch_pool *pool; |
42e9a92f RL |
799 | struct fc_exch *ep = NULL; |
800 | ||
801 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
b2f0091f VD |
802 | pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask); |
803 | spin_lock_bh(&pool->lock); | |
804 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); | |
42e9a92f RL |
805 | if (ep) { |
806 | fc_exch_hold(ep); | |
807 | WARN_ON(ep->xid != xid); | |
808 | } | |
b2f0091f | 809 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
810 | } |
811 | return ep; | |
812 | } | |
813 | ||
1a7b75ae RL |
814 | |
815 | /** | |
816 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and | |
3a3b42bf RL |
817 | * the memory allocated for the related objects may be freed. |
818 | * @sp: The sequence that has completed | |
1a7b75ae RL |
819 | */ |
820 | static void fc_exch_done(struct fc_seq *sp) | |
42e9a92f RL |
821 | { |
822 | struct fc_exch *ep = fc_seq_exch(sp); | |
823 | int rc; | |
824 | ||
825 | spin_lock_bh(&ep->ex_lock); | |
826 | rc = fc_exch_done_locked(ep); | |
827 | spin_unlock_bh(&ep->ex_lock); | |
828 | if (!rc) | |
b2f0091f | 829 | fc_exch_delete(ep); |
42e9a92f | 830 | } |
42e9a92f | 831 | |
3a3b42bf RL |
832 | /** |
833 | * fc_exch_resp() - Allocate a new exchange for a response frame | |
834 | * @lport: The local port that the exchange was for | |
835 | * @mp: The exchange manager to allocate the exchange from | |
836 | * @fp: The response frame | |
837 | * | |
42e9a92f RL |
838 | * Sets the responder ID in the frame header. |
839 | */ | |
52ff878c VD |
840 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
841 | struct fc_exch_mgr *mp, | |
842 | struct fc_frame *fp) | |
42e9a92f RL |
843 | { |
844 | struct fc_exch *ep; | |
845 | struct fc_frame_header *fh; | |
42e9a92f | 846 | |
52ff878c | 847 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
848 | if (ep) { |
849 | ep->class = fc_frame_class(fp); | |
850 | ||
851 | /* | |
852 | * Set EX_CTX indicating we're responding on this exchange. | |
853 | */ | |
854 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
855 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
856 | fh = fc_frame_header_get(fp); | |
857 | ep->sid = ntoh24(fh->fh_d_id); | |
858 | ep->did = ntoh24(fh->fh_s_id); | |
859 | ep->oid = ep->did; | |
860 | ||
861 | /* | |
862 | * Allocated exchange has placed the XID in the | |
863 | * originator field. Move it to the responder field, | |
864 | * and set the originator XID from the frame. | |
865 | */ | |
866 | ep->rxid = ep->xid; | |
867 | ep->oxid = ntohs(fh->fh_ox_id); | |
868 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
869 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
870 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
871 | ||
42e9a92f | 872 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 873 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
874 | } |
875 | return ep; | |
876 | } | |
877 | ||
3a3b42bf RL |
878 | /** |
879 | * fc_seq_lookup_recip() - Find a sequence where the other end | |
880 | * originated the sequence | |
881 | * @lport: The local port that the frame was sent to | |
882 | * @mp: The Exchange Manager to lookup the exchange from | |
883 | * @fp: The frame associated with the sequence we're looking for | |
884 | * | |
42e9a92f RL |
885 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
886 | * on the ep that should be released by the caller. | |
887 | */ | |
52ff878c VD |
888 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
889 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 890 | struct fc_frame *fp) |
42e9a92f RL |
891 | { |
892 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
893 | struct fc_exch *ep = NULL; | |
894 | struct fc_seq *sp = NULL; | |
895 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
896 | u32 f_ctl; | |
897 | u16 xid; | |
898 | ||
899 | f_ctl = ntoh24(fh->fh_f_ctl); | |
900 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
901 | ||
902 | /* | |
903 | * Lookup or create the exchange if we will be creating the sequence. | |
904 | */ | |
905 | if (f_ctl & FC_FC_EX_CTX) { | |
906 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
907 | ep = fc_exch_find(mp, xid); | |
908 | if (!ep) { | |
909 | atomic_inc(&mp->stats.xid_not_found); | |
910 | reject = FC_RJT_OX_ID; | |
911 | goto out; | |
912 | } | |
913 | if (ep->rxid == FC_XID_UNKNOWN) | |
914 | ep->rxid = ntohs(fh->fh_rx_id); | |
915 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
916 | reject = FC_RJT_OX_ID; | |
917 | goto rel; | |
918 | } | |
919 | } else { | |
920 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
921 | ||
922 | /* | |
923 | * Special case for MDS issuing an ELS TEST with a | |
924 | * bad rxid of 0. | |
925 | * XXX take this out once we do the proper reject. | |
926 | */ | |
927 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
928 | fc_frame_payload_op(fp) == ELS_TEST) { | |
929 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
930 | xid = FC_XID_UNKNOWN; | |
931 | } | |
932 | ||
933 | /* | |
934 | * new sequence - find the exchange | |
935 | */ | |
936 | ep = fc_exch_find(mp, xid); | |
937 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
938 | if (ep) { | |
939 | atomic_inc(&mp->stats.xid_busy); | |
940 | reject = FC_RJT_RX_ID; | |
941 | goto rel; | |
942 | } | |
52ff878c | 943 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
944 | if (!ep) { |
945 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
946 | goto out; | |
947 | } | |
948 | xid = ep->xid; /* get our XID */ | |
949 | } else if (!ep) { | |
950 | atomic_inc(&mp->stats.xid_not_found); | |
951 | reject = FC_RJT_RX_ID; /* XID not found */ | |
952 | goto out; | |
953 | } | |
954 | } | |
955 | ||
956 | /* | |
957 | * At this point, we have the exchange held. | |
958 | * Find or create the sequence. | |
959 | */ | |
960 | if (fc_sof_is_init(fr_sof(fp))) { | |
a104c844 | 961 | sp = &ep->seq; |
42e9a92f | 962 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 | 963 | sp->id = fh->fh_seq_id; |
42e9a92f RL |
964 | } else { |
965 | sp = &ep->seq; | |
966 | if (sp->id != fh->fh_seq_id) { | |
967 | atomic_inc(&mp->stats.seq_not_found); | |
968 | reject = FC_RJT_SEQ_ID; /* sequence/exch should exist */ | |
969 | goto rel; | |
970 | } | |
971 | } | |
972 | WARN_ON(ep != fc_seq_exch(sp)); | |
973 | ||
974 | if (f_ctl & FC_FC_SEQ_INIT) | |
975 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
976 | ||
977 | fr_seq(fp) = sp; | |
978 | out: | |
979 | return reject; | |
980 | rel: | |
981 | fc_exch_done(&ep->seq); | |
982 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
983 | return reject; | |
984 | } | |
985 | ||
3a3b42bf RL |
986 | /** |
987 | * fc_seq_lookup_orig() - Find a sequence where this end | |
988 | * originated the sequence | |
989 | * @mp: The Exchange Manager to lookup the exchange from | |
990 | * @fp: The frame associated with the sequence we're looking for | |
991 | * | |
42e9a92f RL |
992 | * Does not hold the sequence for the caller. |
993 | */ | |
994 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
995 | struct fc_frame *fp) | |
996 | { | |
997 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
998 | struct fc_exch *ep; | |
999 | struct fc_seq *sp = NULL; | |
1000 | u32 f_ctl; | |
1001 | u16 xid; | |
1002 | ||
1003 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1004 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
1005 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
1006 | ep = fc_exch_find(mp, xid); | |
1007 | if (!ep) | |
1008 | return NULL; | |
1009 | if (ep->seq.id == fh->fh_seq_id) { | |
1010 | /* | |
1011 | * Save the RX_ID if we didn't previously know it. | |
1012 | */ | |
1013 | sp = &ep->seq; | |
1014 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
1015 | ep->rxid == FC_XID_UNKNOWN) { | |
1016 | ep->rxid = ntohs(fh->fh_rx_id); | |
1017 | } | |
1018 | } | |
1019 | fc_exch_release(ep); | |
1020 | return sp; | |
1021 | } | |
1022 | ||
3a3b42bf RL |
1023 | /** |
1024 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange | |
1025 | * @ep: The exchange to set the addresses for | |
1026 | * @orig_id: The originator's ID | |
1027 | * @resp_id: The responder's ID | |
1028 | * | |
42e9a92f RL |
1029 | * Note this must be done before the first sequence of the exchange is sent. |
1030 | */ | |
1031 | static void fc_exch_set_addr(struct fc_exch *ep, | |
1032 | u32 orig_id, u32 resp_id) | |
1033 | { | |
1034 | ep->oid = orig_id; | |
1035 | if (ep->esb_stat & ESB_ST_RESP) { | |
1036 | ep->sid = resp_id; | |
1037 | ep->did = orig_id; | |
1038 | } else { | |
1039 | ep->sid = orig_id; | |
1040 | ep->did = resp_id; | |
1041 | } | |
1042 | } | |
1043 | ||
1a7b75ae | 1044 | /** |
25985edc | 1045 | * fc_seq_els_rsp_send() - Send an ELS response using information from |
3a3b42bf | 1046 | * the existing sequence/exchange. |
92261156 | 1047 | * @fp: The received frame |
3a3b42bf RL |
1048 | * @els_cmd: The ELS command to be sent |
1049 | * @els_data: The ELS data to be sent | |
92261156 JE |
1050 | * |
1051 | * The received frame is not freed. | |
42e9a92f | 1052 | */ |
92261156 | 1053 | static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, |
1a7b75ae | 1054 | struct fc_seq_els_data *els_data) |
42e9a92f RL |
1055 | { |
1056 | switch (els_cmd) { | |
1057 | case ELS_LS_RJT: | |
92261156 | 1058 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); |
42e9a92f RL |
1059 | break; |
1060 | case ELS_LS_ACC: | |
92261156 | 1061 | fc_seq_ls_acc(fp); |
42e9a92f RL |
1062 | break; |
1063 | case ELS_RRQ: | |
92261156 | 1064 | fc_exch_els_rrq(fp); |
42e9a92f RL |
1065 | break; |
1066 | case ELS_REC: | |
92261156 | 1067 | fc_exch_els_rec(fp); |
42e9a92f RL |
1068 | break; |
1069 | default: | |
92261156 | 1070 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
1071 | } |
1072 | } | |
42e9a92f | 1073 | |
3a3b42bf RL |
1074 | /** |
1075 | * fc_seq_send_last() - Send a sequence that is the last in the exchange | |
1076 | * @sp: The sequence that is to be sent | |
1077 | * @fp: The frame that will be sent on the sequence | |
1078 | * @rctl: The R_CTL information to be sent | |
1079 | * @fh_type: The frame header type | |
42e9a92f RL |
1080 | */ |
1081 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
1082 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
1083 | { | |
1084 | u32 f_ctl; | |
1085 | struct fc_exch *ep = fc_seq_exch(sp); | |
1086 | ||
1087 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1088 | f_ctl |= ep->f_ctl; | |
1089 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
1090 | fc_seq_send(ep->lp, sp, fp); | |
1091 | } | |
1092 | ||
3a3b42bf RL |
1093 | /** |
1094 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame | |
1095 | * @sp: The sequence to send the ACK on | |
1096 | * @rx_fp: The received frame that is being acknoledged | |
1097 | * | |
42e9a92f | 1098 | * Send ACK_1 (or equiv.) indicating we received something. |
42e9a92f RL |
1099 | */ |
1100 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
1101 | { | |
1102 | struct fc_frame *fp; | |
1103 | struct fc_frame_header *rx_fh; | |
1104 | struct fc_frame_header *fh; | |
1105 | struct fc_exch *ep = fc_seq_exch(sp); | |
3a3b42bf | 1106 | struct fc_lport *lport = ep->lp; |
42e9a92f RL |
1107 | unsigned int f_ctl; |
1108 | ||
1109 | /* | |
1110 | * Don't send ACKs for class 3. | |
1111 | */ | |
1112 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
3a3b42bf | 1113 | fp = fc_frame_alloc(lport, 0); |
42e9a92f RL |
1114 | if (!fp) |
1115 | return; | |
1116 | ||
1117 | fh = fc_frame_header_get(fp); | |
1118 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
1119 | fh->fh_type = FC_TYPE_BLS; | |
1120 | ||
1121 | /* | |
1122 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1123 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1124 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1125 | * Last ACK uses bits 7-6 (continue sequence), | |
1126 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1127 | */ | |
1128 | rx_fh = fc_frame_header_get(rx_fp); | |
1129 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1130 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1131 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
1132 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1133 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1134 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1135 | hton24(fh->fh_f_ctl, f_ctl); | |
1136 | ||
1137 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
1138 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
1139 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1140 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
1141 | ||
1142 | fr_sof(fp) = fr_sof(rx_fp); | |
1143 | if (f_ctl & FC_FC_END_SEQ) | |
1144 | fr_eof(fp) = FC_EOF_T; | |
1145 | else | |
1146 | fr_eof(fp) = FC_EOF_N; | |
1147 | ||
3a3b42bf | 1148 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1149 | } |
1150 | } | |
1151 | ||
3a3b42bf RL |
1152 | /** |
1153 | * fc_exch_send_ba_rjt() - Send BLS Reject | |
1154 | * @rx_fp: The frame being rejected | |
1155 | * @reason: The reason the frame is being rejected | |
25985edc | 1156 | * @explan: The explanation for the rejection |
3a3b42bf | 1157 | * |
42e9a92f RL |
1158 | * This is for rejecting BA_ABTS only. |
1159 | */ | |
b2ab99c9 RL |
1160 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
1161 | enum fc_ba_rjt_reason reason, | |
1162 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
1163 | { |
1164 | struct fc_frame *fp; | |
1165 | struct fc_frame_header *rx_fh; | |
1166 | struct fc_frame_header *fh; | |
1167 | struct fc_ba_rjt *rp; | |
3a3b42bf | 1168 | struct fc_lport *lport; |
42e9a92f RL |
1169 | unsigned int f_ctl; |
1170 | ||
3a3b42bf RL |
1171 | lport = fr_dev(rx_fp); |
1172 | fp = fc_frame_alloc(lport, sizeof(*rp)); | |
42e9a92f RL |
1173 | if (!fp) |
1174 | return; | |
1175 | fh = fc_frame_header_get(fp); | |
1176 | rx_fh = fc_frame_header_get(rx_fp); | |
1177 | ||
1178 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1179 | ||
1180 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1181 | rp->br_reason = reason; | |
1182 | rp->br_explan = explan; | |
1183 | ||
1184 | /* | |
1185 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1186 | */ | |
1187 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1188 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1d490ce3 JE |
1189 | fh->fh_ox_id = rx_fh->fh_ox_id; |
1190 | fh->fh_rx_id = rx_fh->fh_rx_id; | |
42e9a92f RL |
1191 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
1192 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1193 | fh->fh_type = FC_TYPE_BLS; | |
1194 | ||
1195 | /* | |
1196 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1197 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1198 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1199 | * Last ACK uses bits 7-6 (continue sequence), | |
1200 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1201 | * Always set LAST_SEQ, END_SEQ. | |
1202 | */ | |
1203 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1204 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1205 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1206 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1207 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1208 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1209 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1210 | hton24(fh->fh_f_ctl, f_ctl); | |
1211 | ||
1212 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1213 | fr_eof(fp) = FC_EOF_T; | |
1214 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1215 | fr_eof(fp) = FC_EOF_N; | |
1216 | ||
3a3b42bf | 1217 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1218 | } |
1219 | ||
3a3b42bf RL |
1220 | /** |
1221 | * fc_exch_recv_abts() - Handle an incoming ABTS | |
1222 | * @ep: The exchange the abort was on | |
1223 | * @rx_fp: The ABTS frame | |
1224 | * | |
1225 | * This would be for target mode usually, but could be due to lost | |
1226 | * FCP transfer ready, confirm or RRQ. We always handle this as an | |
1227 | * exchange abort, ignoring the parameter. | |
42e9a92f RL |
1228 | */ |
1229 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1230 | { | |
1231 | struct fc_frame *fp; | |
1232 | struct fc_ba_acc *ap; | |
1233 | struct fc_frame_header *fh; | |
1234 | struct fc_seq *sp; | |
1235 | ||
1236 | if (!ep) | |
1237 | goto reject; | |
1238 | spin_lock_bh(&ep->ex_lock); | |
1239 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1240 | spin_unlock_bh(&ep->ex_lock); | |
1241 | goto reject; | |
1242 | } | |
1243 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) | |
1244 | fc_exch_hold(ep); /* hold for REC_QUAL */ | |
1245 | ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL; | |
1246 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1247 | ||
1248 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1249 | if (!fp) { | |
1250 | spin_unlock_bh(&ep->ex_lock); | |
1251 | goto free; | |
1252 | } | |
1253 | fh = fc_frame_header_get(fp); | |
1254 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1255 | memset(ap, 0, sizeof(*ap)); | |
1256 | sp = &ep->seq; | |
1257 | ap->ba_high_seq_cnt = htons(0xffff); | |
1258 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1259 | ap->ba_seq_id = sp->id; | |
1260 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1261 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1262 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1263 | } | |
a7e84f2b | 1264 | sp = fc_seq_start_next_locked(sp); |
42e9a92f RL |
1265 | spin_unlock_bh(&ep->ex_lock); |
1266 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); | |
1267 | fc_frame_free(rx_fp); | |
1268 | return; | |
1269 | ||
1270 | reject: | |
1271 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
1272 | free: | |
1273 | fc_frame_free(rx_fp); | |
1274 | } | |
1275 | ||
239e8104 JE |
1276 | /** |
1277 | * fc_seq_assign() - Assign exchange and sequence for incoming request | |
1278 | * @lport: The local port that received the request | |
1279 | * @fp: The request frame | |
1280 | * | |
1281 | * On success, the sequence pointer will be returned and also in fr_seq(@fp). | |
62bdb645 JE |
1282 | * A reference will be held on the exchange/sequence for the caller, which |
1283 | * must call fc_seq_release(). | |
239e8104 JE |
1284 | */ |
1285 | static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) | |
1286 | { | |
1287 | struct fc_exch_mgr_anchor *ema; | |
1288 | ||
1289 | WARN_ON(lport != fr_dev(fp)); | |
1290 | WARN_ON(fr_seq(fp)); | |
1291 | fr_seq(fp) = NULL; | |
1292 | ||
1293 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1294 | if ((!ema->match || ema->match(fp)) && | |
530994d6 | 1295 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) |
239e8104 JE |
1296 | break; |
1297 | return fr_seq(fp); | |
1298 | } | |
1299 | ||
62bdb645 JE |
1300 | /** |
1301 | * fc_seq_release() - Release the hold | |
1302 | * @sp: The sequence. | |
1303 | */ | |
1304 | static void fc_seq_release(struct fc_seq *sp) | |
1305 | { | |
1306 | fc_exch_release(fc_seq_exch(sp)); | |
1307 | } | |
1308 | ||
3a3b42bf | 1309 | /** |
92261156 | 1310 | * fc_exch_recv_req() - Handler for an incoming request |
3a3b42bf RL |
1311 | * @lport: The local port that received the request |
1312 | * @mp: The EM that the exchange is on | |
1313 | * @fp: The request frame | |
92261156 JE |
1314 | * |
1315 | * This is used when the other end is originating the exchange | |
1316 | * and the sequence. | |
42e9a92f | 1317 | */ |
3a3b42bf | 1318 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
42e9a92f RL |
1319 | struct fc_frame *fp) |
1320 | { | |
1321 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1322 | struct fc_seq *sp = NULL; | |
1323 | struct fc_exch *ep = NULL; | |
42e9a92f RL |
1324 | enum fc_pf_rjt_reason reject; |
1325 | ||
174e1ebf CL |
1326 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
1327 | * problem now that we know a new exchange needs to be allocated | |
1328 | */ | |
3a3b42bf RL |
1329 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
1330 | if (!lport) { | |
174e1ebf CL |
1331 | fc_frame_free(fp); |
1332 | return; | |
1333 | } | |
92261156 JE |
1334 | fr_dev(fp) = lport; |
1335 | ||
1336 | BUG_ON(fr_seq(fp)); /* XXX remove later */ | |
1337 | ||
1338 | /* | |
1339 | * If the RX_ID is 0xffff, don't allocate an exchange. | |
1340 | * The upper-level protocol may request one later, if needed. | |
1341 | */ | |
1342 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) | |
1343 | return lport->tt.lport_recv(lport, fp); | |
174e1ebf | 1344 | |
3a3b42bf | 1345 | reject = fc_seq_lookup_recip(lport, mp, fp); |
42e9a92f RL |
1346 | if (reject == FC_RJT_NONE) { |
1347 | sp = fr_seq(fp); /* sequence will be held */ | |
1348 | ep = fc_seq_exch(sp); | |
42e9a92f | 1349 | fc_seq_send_ack(sp, fp); |
f60e12e9 | 1350 | ep->encaps = fr_encaps(fp); |
42e9a92f RL |
1351 | |
1352 | /* | |
1353 | * Call the receive function. | |
1354 | * | |
1355 | * The receive function may allocate a new sequence | |
1356 | * over the old one, so we shouldn't change the | |
1357 | * sequence after this. | |
1358 | * | |
1359 | * The frame will be freed by the receive function. | |
1360 | * If new exch resp handler is valid then call that | |
1361 | * first. | |
1362 | */ | |
1363 | if (ep->resp) | |
1364 | ep->resp(sp, fp, ep->arg); | |
1365 | else | |
92261156 | 1366 | lport->tt.lport_recv(lport, fp); |
42e9a92f RL |
1367 | fc_exch_release(ep); /* release from lookup */ |
1368 | } else { | |
3a3b42bf RL |
1369 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
1370 | reject); | |
42e9a92f RL |
1371 | fc_frame_free(fp); |
1372 | } | |
1373 | } | |
1374 | ||
3a3b42bf RL |
1375 | /** |
1376 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other | |
1377 | * end is the originator of the sequence that is a | |
1378 | * response to our initial exchange | |
1379 | * @mp: The EM that the exchange is on | |
1380 | * @fp: The response frame | |
42e9a92f RL |
1381 | */ |
1382 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1383 | { | |
1384 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1385 | struct fc_seq *sp; | |
1386 | struct fc_exch *ep; | |
1387 | enum fc_sof sof; | |
1388 | u32 f_ctl; | |
1389 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1390 | void *ex_resp_arg; | |
1391 | int rc; | |
1392 | ||
1393 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1394 | if (!ep) { | |
1395 | atomic_inc(&mp->stats.xid_not_found); | |
1396 | goto out; | |
1397 | } | |
30121d14 SM |
1398 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1399 | atomic_inc(&mp->stats.xid_not_found); | |
8236554a | 1400 | goto rel; |
30121d14 | 1401 | } |
42e9a92f RL |
1402 | if (ep->rxid == FC_XID_UNKNOWN) |
1403 | ep->rxid = ntohs(fh->fh_rx_id); | |
1404 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1405 | atomic_inc(&mp->stats.xid_not_found); | |
1406 | goto rel; | |
1407 | } | |
1408 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1409 | ep->did != FC_FID_FLOGI) { | |
1410 | atomic_inc(&mp->stats.xid_not_found); | |
1411 | goto rel; | |
1412 | } | |
1413 | sof = fr_sof(fp); | |
a104c844 | 1414 | sp = &ep->seq; |
b3667f91 | 1415 | if (fc_sof_is_init(sof)) { |
42e9a92f | 1416 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 JE |
1417 | sp->id = fh->fh_seq_id; |
1418 | } else if (sp->id != fh->fh_seq_id) { | |
1419 | atomic_inc(&mp->stats.seq_not_found); | |
1420 | goto rel; | |
42e9a92f | 1421 | } |
a104c844 | 1422 | |
42e9a92f RL |
1423 | f_ctl = ntoh24(fh->fh_f_ctl); |
1424 | fr_seq(fp) = sp; | |
1425 | if (f_ctl & FC_FC_SEQ_INIT) | |
1426 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1427 | ||
1428 | if (fc_sof_needs_ack(sof)) | |
1429 | fc_seq_send_ack(sp, fp); | |
1430 | resp = ep->resp; | |
1431 | ex_resp_arg = ep->arg; | |
1432 | ||
1433 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1434 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1435 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1436 | spin_lock_bh(&ep->ex_lock); | |
1437 | rc = fc_exch_done_locked(ep); | |
1438 | WARN_ON(fc_seq_exch(sp) != ep); | |
1439 | spin_unlock_bh(&ep->ex_lock); | |
1440 | if (!rc) | |
b2f0091f | 1441 | fc_exch_delete(ep); |
42e9a92f RL |
1442 | } |
1443 | ||
1444 | /* | |
1445 | * Call the receive function. | |
1446 | * The sequence is held (has a refcnt) for us, | |
1447 | * but not for the receive function. | |
1448 | * | |
1449 | * The receive function may allocate a new sequence | |
1450 | * over the old one, so we shouldn't change the | |
1451 | * sequence after this. | |
1452 | * | |
1453 | * The frame will be freed by the receive function. | |
1454 | * If new exch resp handler is valid then call that | |
1455 | * first. | |
1456 | */ | |
1457 | if (resp) | |
1458 | resp(sp, fp, ex_resp_arg); | |
1459 | else | |
1460 | fc_frame_free(fp); | |
1461 | fc_exch_release(ep); | |
1462 | return; | |
1463 | rel: | |
1464 | fc_exch_release(ep); | |
1465 | out: | |
1466 | fc_frame_free(fp); | |
1467 | } | |
1468 | ||
3a3b42bf RL |
1469 | /** |
1470 | * fc_exch_recv_resp() - Handler for a sequence where other end is | |
1471 | * responding to our sequence | |
1472 | * @mp: The EM that the exchange is on | |
1473 | * @fp: The response frame | |
42e9a92f RL |
1474 | */ |
1475 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1476 | { | |
1477 | struct fc_seq *sp; | |
1478 | ||
1479 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1480 | |
1481 | if (!sp) | |
42e9a92f | 1482 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1483 | else |
42e9a92f | 1484 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1485 | |
42e9a92f RL |
1486 | fc_frame_free(fp); |
1487 | } | |
1488 | ||
3a3b42bf RL |
1489 | /** |
1490 | * fc_exch_abts_resp() - Handler for a response to an ABT | |
1491 | * @ep: The exchange that the frame is on | |
1492 | * @fp: The response frame | |
1493 | * | |
1494 | * This response would be to an ABTS cancelling an exchange or sequence. | |
1495 | * The response can be either BA_ACC or BA_RJT | |
42e9a92f RL |
1496 | */ |
1497 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1498 | { | |
1499 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1500 | void *ex_resp_arg; | |
1501 | struct fc_frame_header *fh; | |
1502 | struct fc_ba_acc *ap; | |
1503 | struct fc_seq *sp; | |
1504 | u16 low; | |
1505 | u16 high; | |
1506 | int rc = 1, has_rec = 0; | |
1507 | ||
1508 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1509 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1510 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1511 | |
1512 | if (cancel_delayed_work_sync(&ep->timeout_work)) | |
1513 | fc_exch_release(ep); /* release from pending timer hold */ | |
1514 | ||
1515 | spin_lock_bh(&ep->ex_lock); | |
1516 | switch (fh->fh_r_ctl) { | |
1517 | case FC_RCTL_BA_ACC: | |
1518 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1519 | if (!ap) | |
1520 | break; | |
1521 | ||
1522 | /* | |
1523 | * Decide whether to establish a Recovery Qualifier. | |
1524 | * We do this if there is a non-empty SEQ_CNT range and | |
1525 | * SEQ_ID is the same as the one we aborted. | |
1526 | */ | |
1527 | low = ntohs(ap->ba_low_seq_cnt); | |
1528 | high = ntohs(ap->ba_high_seq_cnt); | |
1529 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1530 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1531 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1532 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1533 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1534 | has_rec = 1; | |
1535 | } | |
1536 | break; | |
1537 | case FC_RCTL_BA_RJT: | |
1538 | break; | |
1539 | default: | |
1540 | break; | |
1541 | } | |
1542 | ||
1543 | resp = ep->resp; | |
1544 | ex_resp_arg = ep->arg; | |
1545 | ||
1546 | /* do we need to do some other checks here. Can we reuse more of | |
1547 | * fc_exch_recv_seq_resp | |
1548 | */ | |
1549 | sp = &ep->seq; | |
1550 | /* | |
1551 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1552 | */ | |
1553 | if (ep->fh_type != FC_TYPE_FCP && | |
1554 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1555 | rc = fc_exch_done_locked(ep); | |
1556 | spin_unlock_bh(&ep->ex_lock); | |
1557 | if (!rc) | |
b2f0091f | 1558 | fc_exch_delete(ep); |
42e9a92f RL |
1559 | |
1560 | if (resp) | |
1561 | resp(sp, fp, ex_resp_arg); | |
1562 | else | |
1563 | fc_frame_free(fp); | |
1564 | ||
1565 | if (has_rec) | |
1566 | fc_exch_timer_set(ep, ep->r_a_tov); | |
1567 | ||
1568 | } | |
1569 | ||
3a3b42bf RL |
1570 | /** |
1571 | * fc_exch_recv_bls() - Handler for a BLS sequence | |
1572 | * @mp: The EM that the exchange is on | |
1573 | * @fp: The request frame | |
1574 | * | |
1575 | * The BLS frame is always a sequence initiated by the remote side. | |
42e9a92f RL |
1576 | * We may be either the originator or recipient of the exchange. |
1577 | */ | |
1578 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1579 | { | |
1580 | struct fc_frame_header *fh; | |
1581 | struct fc_exch *ep; | |
1582 | u32 f_ctl; | |
1583 | ||
1584 | fh = fc_frame_header_get(fp); | |
1585 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1586 | fr_seq(fp) = NULL; | |
1587 | ||
1588 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1589 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1590 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1591 | spin_lock_bh(&ep->ex_lock); | |
1592 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1593 | spin_unlock_bh(&ep->ex_lock); | |
1594 | } | |
1595 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1596 | /* | |
1597 | * A response to a sequence we initiated. | |
1598 | * This should only be ACKs for class 2 or F. | |
1599 | */ | |
1600 | switch (fh->fh_r_ctl) { | |
1601 | case FC_RCTL_ACK_1: | |
1602 | case FC_RCTL_ACK_0: | |
1603 | break; | |
1604 | default: | |
7414705e RL |
1605 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received", |
1606 | fh->fh_r_ctl, | |
1607 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1608 | break; |
1609 | } | |
1610 | fc_frame_free(fp); | |
1611 | } else { | |
1612 | switch (fh->fh_r_ctl) { | |
1613 | case FC_RCTL_BA_RJT: | |
1614 | case FC_RCTL_BA_ACC: | |
1615 | if (ep) | |
1616 | fc_exch_abts_resp(ep, fp); | |
1617 | else | |
1618 | fc_frame_free(fp); | |
1619 | break; | |
1620 | case FC_RCTL_BA_ABTS: | |
1621 | fc_exch_recv_abts(ep, fp); | |
1622 | break; | |
1623 | default: /* ignore junk */ | |
1624 | fc_frame_free(fp); | |
1625 | break; | |
1626 | } | |
1627 | } | |
1628 | if (ep) | |
1629 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1630 | } | |
1631 | ||
3a3b42bf RL |
1632 | /** |
1633 | * fc_seq_ls_acc() - Accept sequence with LS_ACC | |
92261156 | 1634 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1635 | * |
42e9a92f RL |
1636 | * If this fails due to allocation or transmit congestion, assume the |
1637 | * originator will repeat the sequence. | |
1638 | */ | |
92261156 | 1639 | static void fc_seq_ls_acc(struct fc_frame *rx_fp) |
42e9a92f | 1640 | { |
92261156 | 1641 | struct fc_lport *lport; |
42e9a92f RL |
1642 | struct fc_els_ls_acc *acc; |
1643 | struct fc_frame *fp; | |
1644 | ||
92261156 JE |
1645 | lport = fr_dev(rx_fp); |
1646 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1647 | if (!fp) | |
1648 | return; | |
1649 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1650 | memset(acc, 0, sizeof(*acc)); | |
1651 | acc->la_cmd = ELS_LS_ACC; | |
1652 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1653 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1654 | } |
1655 | ||
3a3b42bf RL |
1656 | /** |
1657 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT | |
92261156 | 1658 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1659 | * @reason: The reason the sequence is being rejected |
92261156 | 1660 | * @explan: The explanation for the rejection |
3a3b42bf | 1661 | * |
42e9a92f RL |
1662 | * If this fails due to allocation or transmit congestion, assume the |
1663 | * originator will repeat the sequence. | |
1664 | */ | |
92261156 | 1665 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, |
42e9a92f RL |
1666 | enum fc_els_rjt_explan explan) |
1667 | { | |
92261156 | 1668 | struct fc_lport *lport; |
42e9a92f RL |
1669 | struct fc_els_ls_rjt *rjt; |
1670 | struct fc_frame *fp; | |
1671 | ||
92261156 JE |
1672 | lport = fr_dev(rx_fp); |
1673 | fp = fc_frame_alloc(lport, sizeof(*rjt)); | |
1674 | if (!fp) | |
1675 | return; | |
1676 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1677 | memset(rjt, 0, sizeof(*rjt)); | |
1678 | rjt->er_cmd = ELS_LS_RJT; | |
1679 | rjt->er_reason = reason; | |
1680 | rjt->er_explan = explan; | |
1681 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1682 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1683 | } |
1684 | ||
3a3b42bf RL |
1685 | /** |
1686 | * fc_exch_reset() - Reset an exchange | |
1687 | * @ep: The exchange to be reset | |
1688 | */ | |
42e9a92f RL |
1689 | static void fc_exch_reset(struct fc_exch *ep) |
1690 | { | |
1691 | struct fc_seq *sp; | |
1692 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
1693 | void *arg; | |
1694 | int rc = 1; | |
1695 | ||
1696 | spin_lock_bh(&ep->ex_lock); | |
1697 | ep->state |= FC_EX_RST_CLEANUP; | |
42e9a92f RL |
1698 | if (cancel_delayed_work(&ep->timeout_work)) |
1699 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
1700 | resp = ep->resp; | |
1701 | ep->resp = NULL; | |
1702 | if (ep->esb_stat & ESB_ST_REC_QUAL) | |
1703 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1704 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1705 | arg = ep->arg; | |
1706 | sp = &ep->seq; | |
1707 | rc = fc_exch_done_locked(ep); | |
1708 | spin_unlock_bh(&ep->ex_lock); | |
1709 | if (!rc) | |
b2f0091f | 1710 | fc_exch_delete(ep); |
42e9a92f RL |
1711 | |
1712 | if (resp) | |
1713 | resp(sp, ERR_PTR(-FC_EX_CLOSED), arg); | |
1714 | } | |
1715 | ||
b2f0091f | 1716 | /** |
3a3b42bf RL |
1717 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
1718 | * @lport: The local port that the exchange pool is on | |
1719 | * @pool: The exchange pool to be reset | |
1720 | * @sid: The source ID | |
1721 | * @did: The destination ID | |
b2f0091f | 1722 | * |
3a3b42bf RL |
1723 | * Resets a per cpu exches pool, releasing all of its sequences |
1724 | * and exchanges. If sid is non-zero then reset only exchanges | |
1725 | * we sourced from the local port's FID. If did is non-zero then | |
1726 | * only reset exchanges destined for the local port's FID. | |
42e9a92f | 1727 | */ |
b2f0091f VD |
1728 | static void fc_exch_pool_reset(struct fc_lport *lport, |
1729 | struct fc_exch_pool *pool, | |
1730 | u32 sid, u32 did) | |
42e9a92f RL |
1731 | { |
1732 | struct fc_exch *ep; | |
1733 | struct fc_exch *next; | |
1734 | ||
b2f0091f | 1735 | spin_lock_bh(&pool->lock); |
42e9a92f | 1736 | restart: |
b2f0091f VD |
1737 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
1738 | if ((lport == ep->lp) && | |
1739 | (sid == 0 || sid == ep->sid) && | |
1740 | (did == 0 || did == ep->did)) { | |
1741 | fc_exch_hold(ep); | |
1742 | spin_unlock_bh(&pool->lock); | |
1743 | ||
1744 | fc_exch_reset(ep); | |
1745 | ||
1746 | fc_exch_release(ep); | |
1747 | spin_lock_bh(&pool->lock); | |
1748 | ||
1749 | /* | |
1750 | * must restart loop incase while lock | |
1751 | * was down multiple eps were released. | |
1752 | */ | |
1753 | goto restart; | |
42e9a92f | 1754 | } |
b2f0091f VD |
1755 | } |
1756 | spin_unlock_bh(&pool->lock); | |
1757 | } | |
1758 | ||
1759 | /** | |
3a3b42bf RL |
1760 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
1761 | * @lport: The local port whose EMs are to be reset | |
1762 | * @sid: The source ID | |
1763 | * @did: The destination ID | |
b2f0091f | 1764 | * |
3a3b42bf RL |
1765 | * Reset all EMs associated with a given local port. Release all |
1766 | * sequences and exchanges. If sid is non-zero then reset only the | |
1767 | * exchanges sent from the local port's FID. If did is non-zero then | |
1768 | * reset only exchanges destined for the local port's FID. | |
b2f0091f VD |
1769 | */ |
1770 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) | |
1771 | { | |
1772 | struct fc_exch_mgr_anchor *ema; | |
1773 | unsigned int cpu; | |
1774 | ||
1775 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
1776 | for_each_possible_cpu(cpu) | |
1777 | fc_exch_pool_reset(lport, | |
1778 | per_cpu_ptr(ema->mp->pool, cpu), | |
1779 | sid, did); | |
42e9a92f | 1780 | } |
42e9a92f RL |
1781 | } |
1782 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1783 | ||
92261156 JE |
1784 | /** |
1785 | * fc_exch_lookup() - find an exchange | |
1786 | * @lport: The local port | |
1787 | * @xid: The exchange ID | |
1788 | * | |
1789 | * Returns exchange pointer with hold for caller, or NULL if not found. | |
1790 | */ | |
1791 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) | |
1792 | { | |
1793 | struct fc_exch_mgr_anchor *ema; | |
1794 | ||
1795 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1796 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) | |
1797 | return fc_exch_find(ema->mp, xid); | |
1798 | return NULL; | |
1799 | } | |
1800 | ||
3a3b42bf RL |
1801 | /** |
1802 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests | |
92261156 | 1803 | * @rfp: The REC frame, not freed here. |
3a3b42bf | 1804 | * |
42e9a92f RL |
1805 | * Note that the requesting port may be different than the S_ID in the request. |
1806 | */ | |
92261156 | 1807 | static void fc_exch_els_rec(struct fc_frame *rfp) |
42e9a92f | 1808 | { |
92261156 | 1809 | struct fc_lport *lport; |
42e9a92f RL |
1810 | struct fc_frame *fp; |
1811 | struct fc_exch *ep; | |
42e9a92f RL |
1812 | struct fc_els_rec *rp; |
1813 | struct fc_els_rec_acc *acc; | |
1814 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1815 | enum fc_els_rjt_explan explan; | |
1816 | u32 sid; | |
1817 | u16 rxid; | |
1818 | u16 oxid; | |
1819 | ||
92261156 | 1820 | lport = fr_dev(rfp); |
42e9a92f RL |
1821 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); |
1822 | explan = ELS_EXPL_INV_LEN; | |
1823 | if (!rp) | |
1824 | goto reject; | |
1825 | sid = ntoh24(rp->rec_s_id); | |
1826 | rxid = ntohs(rp->rec_rx_id); | |
1827 | oxid = ntohs(rp->rec_ox_id); | |
1828 | ||
92261156 JE |
1829 | ep = fc_exch_lookup(lport, |
1830 | sid == fc_host_port_id(lport->host) ? oxid : rxid); | |
42e9a92f | 1831 | explan = ELS_EXPL_OXID_RXID; |
92261156 JE |
1832 | if (!ep) |
1833 | goto reject; | |
1834 | if (ep->oid != sid || oxid != ep->oxid) | |
1835 | goto rel; | |
1836 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) | |
1837 | goto rel; | |
1838 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1839 | if (!fp) | |
42e9a92f | 1840 | goto out; |
92261156 | 1841 | |
42e9a92f RL |
1842 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
1843 | memset(acc, 0, sizeof(*acc)); | |
1844 | acc->reca_cmd = ELS_LS_ACC; | |
1845 | acc->reca_ox_id = rp->rec_ox_id; | |
1846 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1847 | acc->reca_rx_id = htons(ep->rxid); | |
1848 | if (ep->sid == ep->oid) | |
1849 | hton24(acc->reca_rfid, ep->did); | |
1850 | else | |
1851 | hton24(acc->reca_rfid, ep->sid); | |
1852 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1853 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1854 | ESB_ST_SEQ_INIT | | |
1855 | ESB_ST_COMPLETE)); | |
92261156 JE |
1856 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); |
1857 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1858 | out: |
1859 | fc_exch_release(ep); | |
42e9a92f RL |
1860 | return; |
1861 | ||
1862 | rel: | |
1863 | fc_exch_release(ep); | |
1864 | reject: | |
92261156 | 1865 | fc_seq_ls_rjt(rfp, reason, explan); |
42e9a92f RL |
1866 | } |
1867 | ||
3a3b42bf RL |
1868 | /** |
1869 | * fc_exch_rrq_resp() - Handler for RRQ responses | |
1870 | * @sp: The sequence that the RRQ is on | |
1871 | * @fp: The RRQ frame | |
1872 | * @arg: The exchange that the RRQ is on | |
42e9a92f RL |
1873 | * |
1874 | * TODO: fix error handler. | |
1875 | */ | |
1876 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
1877 | { | |
1878 | struct fc_exch *aborted_ep = arg; | |
1879 | unsigned int op; | |
1880 | ||
1881 | if (IS_ERR(fp)) { | |
1882 | int err = PTR_ERR(fp); | |
1883 | ||
78342da3 | 1884 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 1885 | goto cleanup; |
7414705e RL |
1886 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
1887 | "frame error %d\n", err); | |
42e9a92f RL |
1888 | return; |
1889 | } | |
1890 | ||
1891 | op = fc_frame_payload_op(fp); | |
1892 | fc_frame_free(fp); | |
1893 | ||
1894 | switch (op) { | |
1895 | case ELS_LS_RJT: | |
7414705e | 1896 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ"); |
42e9a92f RL |
1897 | /* fall through */ |
1898 | case ELS_LS_ACC: | |
1899 | goto cleanup; | |
1900 | default: | |
7414705e RL |
1901 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x " |
1902 | "for RRQ", op); | |
42e9a92f RL |
1903 | return; |
1904 | } | |
1905 | ||
1906 | cleanup: | |
1907 | fc_exch_done(&aborted_ep->seq); | |
1908 | /* drop hold for rec qual */ | |
1909 | fc_exch_release(aborted_ep); | |
1910 | } | |
1911 | ||
1a7b75ae RL |
1912 | |
1913 | /** | |
3a3b42bf RL |
1914 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
1915 | * @lport: The local port to send the frame on | |
1916 | * @fp: The frame to be sent | |
1917 | * @resp: The response handler for this request | |
1918 | * @destructor: The destructor for the exchange | |
1919 | * @arg: The argument to be passed to the response handler | |
1920 | * @timer_msec: The timeout period for the exchange | |
1921 | * | |
1922 | * The frame pointer with some of the header's fields must be | |
1923 | * filled before calling this routine, those fields are: | |
1924 | * | |
1925 | * - routing control | |
1926 | * - FC port did | |
1927 | * - FC port sid | |
1928 | * - FC header type | |
1929 | * - frame control | |
1930 | * - parameter or relative offset | |
1a7b75ae | 1931 | */ |
3a3b42bf | 1932 | static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
1a7b75ae RL |
1933 | struct fc_frame *fp, |
1934 | void (*resp)(struct fc_seq *, | |
1935 | struct fc_frame *fp, | |
1936 | void *arg), | |
1937 | void (*destructor)(struct fc_seq *, | |
1938 | void *), | |
1939 | void *arg, u32 timer_msec) | |
1940 | { | |
1941 | struct fc_exch *ep; | |
1942 | struct fc_seq *sp = NULL; | |
1943 | struct fc_frame_header *fh; | |
1944 | int rc = 1; | |
1945 | ||
3a3b42bf | 1946 | ep = fc_exch_alloc(lport, fp); |
1a7b75ae RL |
1947 | if (!ep) { |
1948 | fc_frame_free(fp); | |
1949 | return NULL; | |
1950 | } | |
1951 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1952 | fh = fc_frame_header_get(fp); | |
1953 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
1954 | ep->resp = resp; | |
1955 | ep->destructor = destructor; | |
1956 | ep->arg = arg; | |
1957 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
3a3b42bf | 1958 | ep->lp = lport; |
1a7b75ae RL |
1959 | sp = &ep->seq; |
1960 | ||
1961 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
1962 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
1963 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
1964 | sp->cnt++; | |
1965 | ||
10897ae7 | 1966 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) |
1a7b75ae RL |
1967 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
1968 | ||
3a3b42bf | 1969 | if (unlikely(lport->tt.frame_send(lport, fp))) |
1a7b75ae RL |
1970 | goto err; |
1971 | ||
1972 | if (timer_msec) | |
1973 | fc_exch_timer_set_locked(ep, timer_msec); | |
1974 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
1975 | ||
1976 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
1977 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
1978 | spin_unlock_bh(&ep->ex_lock); | |
1979 | return sp; | |
1980 | err: | |
1981 | rc = fc_exch_done_locked(ep); | |
1982 | spin_unlock_bh(&ep->ex_lock); | |
1983 | if (!rc) | |
1984 | fc_exch_delete(ep); | |
1985 | return NULL; | |
1986 | } | |
1987 | ||
3a3b42bf RL |
1988 | /** |
1989 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command | |
1990 | * @ep: The exchange to send the RRQ on | |
1991 | * | |
42e9a92f RL |
1992 | * This tells the remote port to stop blocking the use of |
1993 | * the exchange and the seq_cnt range. | |
1994 | */ | |
1995 | static void fc_exch_rrq(struct fc_exch *ep) | |
1996 | { | |
3a3b42bf | 1997 | struct fc_lport *lport; |
42e9a92f RL |
1998 | struct fc_els_rrq *rrq; |
1999 | struct fc_frame *fp; | |
42e9a92f RL |
2000 | u32 did; |
2001 | ||
3a3b42bf | 2002 | lport = ep->lp; |
42e9a92f | 2003 | |
3a3b42bf | 2004 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
42e9a92f | 2005 | if (!fp) |
a0cc1ecc VD |
2006 | goto retry; |
2007 | ||
42e9a92f RL |
2008 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
2009 | memset(rrq, 0, sizeof(*rrq)); | |
2010 | rrq->rrq_cmd = ELS_RRQ; | |
2011 | hton24(rrq->rrq_s_id, ep->sid); | |
2012 | rrq->rrq_ox_id = htons(ep->oxid); | |
2013 | rrq->rrq_rx_id = htons(ep->rxid); | |
2014 | ||
2015 | did = ep->did; | |
2016 | if (ep->esb_stat & ESB_ST_RESP) | |
2017 | did = ep->sid; | |
2018 | ||
2019 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
7b2787ec | 2020 | lport->port_id, FC_TYPE_ELS, |
42e9a92f RL |
2021 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
2022 | ||
3a3b42bf RL |
2023 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
2024 | lport->e_d_tov)) | |
a0cc1ecc VD |
2025 | return; |
2026 | ||
2027 | retry: | |
2028 | spin_lock_bh(&ep->ex_lock); | |
2029 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
2030 | spin_unlock_bh(&ep->ex_lock); | |
2031 | /* drop hold for rec qual */ | |
2032 | fc_exch_release(ep); | |
42e9a92f RL |
2033 | return; |
2034 | } | |
a0cc1ecc VD |
2035 | ep->esb_stat |= ESB_ST_REC_QUAL; |
2036 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
2037 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
2038 | } |
2039 | ||
3a3b42bf RL |
2040 | /** |
2041 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests | |
92261156 | 2042 | * @fp: The RRQ frame, not freed here. |
42e9a92f | 2043 | */ |
92261156 | 2044 | static void fc_exch_els_rrq(struct fc_frame *fp) |
42e9a92f | 2045 | { |
92261156 | 2046 | struct fc_lport *lport; |
3f127ad9 | 2047 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
42e9a92f RL |
2048 | struct fc_els_rrq *rp; |
2049 | u32 sid; | |
2050 | u16 xid; | |
2051 | enum fc_els_rjt_explan explan; | |
2052 | ||
92261156 | 2053 | lport = fr_dev(fp); |
42e9a92f RL |
2054 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
2055 | explan = ELS_EXPL_INV_LEN; | |
2056 | if (!rp) | |
2057 | goto reject; | |
2058 | ||
2059 | /* | |
2060 | * lookup subject exchange. | |
2061 | */ | |
42e9a92f | 2062 | sid = ntoh24(rp->rrq_s_id); /* subject source */ |
92261156 JE |
2063 | xid = fc_host_port_id(lport->host) == sid ? |
2064 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
2065 | ep = fc_exch_lookup(lport, xid); | |
42e9a92f RL |
2066 | explan = ELS_EXPL_OXID_RXID; |
2067 | if (!ep) | |
2068 | goto reject; | |
2069 | spin_lock_bh(&ep->ex_lock); | |
2070 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
2071 | goto unlock_reject; | |
2072 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
2073 | ep->rxid != FC_XID_UNKNOWN) | |
2074 | goto unlock_reject; | |
2075 | explan = ELS_EXPL_SID; | |
2076 | if (ep->sid != sid) | |
2077 | goto unlock_reject; | |
2078 | ||
2079 | /* | |
2080 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
2081 | */ | |
2082 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
2083 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
2084 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
2085 | } | |
2086 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
2087 | if (cancel_delayed_work(&ep->timeout_work)) | |
2088 | atomic_dec(&ep->ex_refcnt); /* drop timer hold */ | |
2089 | } | |
2090 | ||
2091 | spin_unlock_bh(&ep->ex_lock); | |
2092 | ||
2093 | /* | |
2094 | * Send LS_ACC. | |
2095 | */ | |
92261156 | 2096 | fc_seq_ls_acc(fp); |
3f127ad9 | 2097 | goto out; |
42e9a92f RL |
2098 | |
2099 | unlock_reject: | |
2100 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f | 2101 | reject: |
92261156 | 2102 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); |
3f127ad9 | 2103 | out: |
3f127ad9 VD |
2104 | if (ep) |
2105 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
42e9a92f RL |
2106 | } |
2107 | ||
3a3b42bf RL |
2108 | /** |
2109 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs | |
2110 | * @lport: The local port to add the exchange manager to | |
2111 | * @mp: The exchange manager to be added to the local port | |
2112 | * @match: The match routine that indicates when this EM should be used | |
2113 | */ | |
96316099 VD |
2114 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
2115 | struct fc_exch_mgr *mp, | |
2116 | bool (*match)(struct fc_frame *)) | |
2117 | { | |
2118 | struct fc_exch_mgr_anchor *ema; | |
2119 | ||
2120 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
2121 | if (!ema) | |
2122 | return ema; | |
2123 | ||
2124 | ema->mp = mp; | |
2125 | ema->match = match; | |
2126 | /* add EM anchor to EM anchors list */ | |
2127 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
2128 | kref_get(&mp->kref); | |
2129 | return ema; | |
2130 | } | |
2131 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
2132 | ||
3a3b42bf RL |
2133 | /** |
2134 | * fc_exch_mgr_destroy() - Destroy an exchange manager | |
2135 | * @kref: The reference to the EM to be destroyed | |
2136 | */ | |
96316099 VD |
2137 | static void fc_exch_mgr_destroy(struct kref *kref) |
2138 | { | |
2139 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
2140 | ||
96316099 | 2141 | mempool_destroy(mp->ep_pool); |
e4bc50be | 2142 | free_percpu(mp->pool); |
96316099 VD |
2143 | kfree(mp); |
2144 | } | |
2145 | ||
3a3b42bf RL |
2146 | /** |
2147 | * fc_exch_mgr_del() - Delete an EM from a local port's list | |
2148 | * @ema: The exchange manager anchor identifying the EM to be deleted | |
2149 | */ | |
96316099 VD |
2150 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
2151 | { | |
2152 | /* remove EM anchor from EM anchors list */ | |
2153 | list_del(&ema->ema_list); | |
2154 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
2155 | kfree(ema); | |
2156 | } | |
2157 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
2158 | ||
174e1ebf | 2159 | /** |
3a3b42bf RL |
2160 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
2161 | * @src: Source lport to clone exchange managers from | |
2162 | * @dst: New lport that takes references to all the exchange managers | |
174e1ebf CL |
2163 | */ |
2164 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) | |
2165 | { | |
2166 | struct fc_exch_mgr_anchor *ema, *tmp; | |
2167 | ||
2168 | list_for_each_entry(ema, &src->ema_list, ema_list) { | |
2169 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) | |
2170 | goto err; | |
2171 | } | |
2172 | return 0; | |
2173 | err: | |
2174 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) | |
2175 | fc_exch_mgr_del(ema); | |
2176 | return -ENOMEM; | |
2177 | } | |
72fa396b | 2178 | EXPORT_SYMBOL(fc_exch_mgr_list_clone); |
174e1ebf | 2179 | |
3a3b42bf RL |
2180 | /** |
2181 | * fc_exch_mgr_alloc() - Allocate an exchange manager | |
2182 | * @lport: The local port that the new EM will be associated with | |
2183 | * @class: The default FC class for new exchanges | |
2184 | * @min_xid: The minimum XID for exchanges from the new EM | |
2185 | * @max_xid: The maximum XID for exchanges from the new EM | |
2186 | * @match: The match routine for the new EM | |
2187 | */ | |
2188 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, | |
42e9a92f | 2189 | enum fc_class class, |
52ff878c VD |
2190 | u16 min_xid, u16 max_xid, |
2191 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
2192 | { |
2193 | struct fc_exch_mgr *mp; | |
e4bc50be VD |
2194 | u16 pool_exch_range; |
2195 | size_t pool_size; | |
2196 | unsigned int cpu; | |
2197 | struct fc_exch_pool *pool; | |
42e9a92f | 2198 | |
e4bc50be VD |
2199 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
2200 | (min_xid & fc_cpu_mask) != 0) { | |
3a3b42bf | 2201 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
7414705e | 2202 | min_xid, max_xid); |
42e9a92f RL |
2203 | return NULL; |
2204 | } | |
2205 | ||
2206 | /* | |
b2f0091f | 2207 | * allocate memory for EM |
42e9a92f | 2208 | */ |
b2f0091f | 2209 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
42e9a92f RL |
2210 | if (!mp) |
2211 | return NULL; | |
2212 | ||
2213 | mp->class = class; | |
42e9a92f RL |
2214 | /* adjust em exch xid range for offload */ |
2215 | mp->min_xid = min_xid; | |
2216 | mp->max_xid = max_xid; | |
42e9a92f RL |
2217 | |
2218 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
2219 | if (!mp->ep_pool) | |
2220 | goto free_mp; | |
2221 | ||
e4bc50be VD |
2222 | /* |
2223 | * Setup per cpu exch pool with entire exchange id range equally | |
2224 | * divided across all cpus. The exch pointers array memory is | |
2225 | * allocated for exch range per pool. | |
2226 | */ | |
2227 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / (fc_cpu_mask + 1); | |
2228 | mp->pool_max_index = pool_exch_range - 1; | |
2229 | ||
2230 | /* | |
2231 | * Allocate and initialize per cpu exch pool | |
2232 | */ | |
2233 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
2234 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
2235 | if (!mp->pool) | |
2236 | goto free_mempool; | |
2237 | for_each_possible_cpu(cpu) { | |
2238 | pool = per_cpu_ptr(mp->pool, cpu); | |
2034c19c HD |
2239 | pool->left = FC_XID_UNKNOWN; |
2240 | pool->right = FC_XID_UNKNOWN; | |
e4bc50be VD |
2241 | spin_lock_init(&pool->lock); |
2242 | INIT_LIST_HEAD(&pool->ex_list); | |
2243 | } | |
2244 | ||
52ff878c | 2245 | kref_init(&mp->kref); |
3a3b42bf | 2246 | if (!fc_exch_mgr_add(lport, mp, match)) { |
e4bc50be VD |
2247 | free_percpu(mp->pool); |
2248 | goto free_mempool; | |
52ff878c VD |
2249 | } |
2250 | ||
2251 | /* | |
2252 | * Above kref_init() sets mp->kref to 1 and then | |
2253 | * call to fc_exch_mgr_add incremented mp->kref again, | |
2254 | * so adjust that extra increment. | |
2255 | */ | |
2256 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
2257 | return mp; |
2258 | ||
e4bc50be VD |
2259 | free_mempool: |
2260 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
2261 | free_mp: |
2262 | kfree(mp); | |
2263 | return NULL; | |
2264 | } | |
2265 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
2266 | ||
3a3b42bf RL |
2267 | /** |
2268 | * fc_exch_mgr_free() - Free all exchange managers on a local port | |
2269 | * @lport: The local port whose EMs are to be freed | |
2270 | */ | |
52ff878c | 2271 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 2272 | { |
52ff878c VD |
2273 | struct fc_exch_mgr_anchor *ema, *next; |
2274 | ||
4ae1e19f | 2275 | flush_workqueue(fc_exch_workqueue); |
52ff878c VD |
2276 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
2277 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
2278 | } |
2279 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
2280 | ||
6c8cc1c0 KP |
2281 | /** |
2282 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending | |
2283 | * upon 'xid'. | |
2284 | * @f_ctl: f_ctl | |
2285 | * @lport: The local port the frame was received on | |
2286 | * @fh: The received frame header | |
2287 | */ | |
2288 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, | |
2289 | struct fc_lport *lport, | |
2290 | struct fc_frame_header *fh) | |
2291 | { | |
2292 | struct fc_exch_mgr_anchor *ema; | |
2293 | u16 xid; | |
2294 | ||
2295 | if (f_ctl & FC_FC_EX_CTX) | |
2296 | xid = ntohs(fh->fh_ox_id); | |
2297 | else { | |
2298 | xid = ntohs(fh->fh_rx_id); | |
2299 | if (xid == FC_XID_UNKNOWN) | |
2300 | return list_entry(lport->ema_list.prev, | |
2301 | typeof(*ema), ema_list); | |
2302 | } | |
2303 | ||
2304 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2305 | if ((xid >= ema->mp->min_xid) && | |
2306 | (xid <= ema->mp->max_xid)) | |
2307 | return ema; | |
2308 | } | |
2309 | return NULL; | |
2310 | } | |
3a3b42bf RL |
2311 | /** |
2312 | * fc_exch_recv() - Handler for received frames | |
2313 | * @lport: The local port the frame was received on | |
6c8cc1c0 | 2314 | * @fp: The received frame |
42e9a92f | 2315 | */ |
3a3b42bf | 2316 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
2317 | { |
2318 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c | 2319 | struct fc_exch_mgr_anchor *ema; |
6c8cc1c0 | 2320 | u32 f_ctl; |
42e9a92f RL |
2321 | |
2322 | /* lport lock ? */ | |
3a3b42bf RL |
2323 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
2324 | FC_LPORT_DBG(lport, "Receiving frames for an lport that " | |
7414705e | 2325 | "has not been initialized correctly\n"); |
42e9a92f RL |
2326 | fc_frame_free(fp); |
2327 | return; | |
2328 | } | |
2329 | ||
52ff878c | 2330 | f_ctl = ntoh24(fh->fh_f_ctl); |
6c8cc1c0 KP |
2331 | ema = fc_find_ema(f_ctl, lport, fh); |
2332 | if (!ema) { | |
2333 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," | |
2334 | "fc_ctl <0x%x>, xid <0x%x>\n", | |
2335 | f_ctl, | |
2336 | (f_ctl & FC_FC_EX_CTX) ? | |
2337 | ntohs(fh->fh_ox_id) : | |
2338 | ntohs(fh->fh_rx_id)); | |
2339 | fc_frame_free(fp); | |
2340 | return; | |
2341 | } | |
52ff878c | 2342 | |
42e9a92f RL |
2343 | /* |
2344 | * If frame is marked invalid, just drop it. | |
2345 | */ | |
42e9a92f RL |
2346 | switch (fr_eof(fp)) { |
2347 | case FC_EOF_T: | |
2348 | if (f_ctl & FC_FC_END_SEQ) | |
2349 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
2350 | /* fall through */ | |
2351 | case FC_EOF_N: | |
2352 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2353 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2354 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2355 | FC_FC_EX_CTX) | |
52ff878c | 2356 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2357 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2358 | fc_exch_recv_resp(ema->mp, fp); |
92261156 | 2359 | else /* no EX_CTX and no SEQ_CTX */ |
3a3b42bf | 2360 | fc_exch_recv_req(lport, ema->mp, fp); |
42e9a92f RL |
2361 | break; |
2362 | default: | |
3a3b42bf RL |
2363 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
2364 | fr_eof(fp)); | |
42e9a92f | 2365 | fc_frame_free(fp); |
42e9a92f RL |
2366 | } |
2367 | } | |
2368 | EXPORT_SYMBOL(fc_exch_recv); | |
2369 | ||
3a3b42bf RL |
2370 | /** |
2371 | * fc_exch_init() - Initialize the exchange layer for a local port | |
2372 | * @lport: The local port to initialize the exchange layer for | |
2373 | */ | |
2374 | int fc_exch_init(struct fc_lport *lport) | |
42e9a92f | 2375 | { |
3a3b42bf RL |
2376 | if (!lport->tt.seq_start_next) |
2377 | lport->tt.seq_start_next = fc_seq_start_next; | |
42e9a92f | 2378 | |
1a5c2d7e JE |
2379 | if (!lport->tt.seq_set_resp) |
2380 | lport->tt.seq_set_resp = fc_seq_set_resp; | |
2381 | ||
3a3b42bf RL |
2382 | if (!lport->tt.exch_seq_send) |
2383 | lport->tt.exch_seq_send = fc_exch_seq_send; | |
42e9a92f | 2384 | |
3a3b42bf RL |
2385 | if (!lport->tt.seq_send) |
2386 | lport->tt.seq_send = fc_seq_send; | |
42e9a92f | 2387 | |
3a3b42bf RL |
2388 | if (!lport->tt.seq_els_rsp_send) |
2389 | lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
42e9a92f | 2390 | |
3a3b42bf RL |
2391 | if (!lport->tt.exch_done) |
2392 | lport->tt.exch_done = fc_exch_done; | |
42e9a92f | 2393 | |
3a3b42bf RL |
2394 | if (!lport->tt.exch_mgr_reset) |
2395 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
42e9a92f | 2396 | |
3a3b42bf RL |
2397 | if (!lport->tt.seq_exch_abort) |
2398 | lport->tt.seq_exch_abort = fc_seq_exch_abort; | |
42e9a92f | 2399 | |
239e8104 JE |
2400 | if (!lport->tt.seq_assign) |
2401 | lport->tt.seq_assign = fc_seq_assign; | |
2402 | ||
62bdb645 JE |
2403 | if (!lport->tt.seq_release) |
2404 | lport->tt.seq_release = fc_seq_release; | |
2405 | ||
89f19a59 VD |
2406 | return 0; |
2407 | } | |
2408 | EXPORT_SYMBOL(fc_exch_init); | |
2409 | ||
2410 | /** | |
2411 | * fc_setup_exch_mgr() - Setup an exchange manager | |
2412 | */ | |
55204909 | 2413 | int fc_setup_exch_mgr(void) |
89f19a59 VD |
2414 | { |
2415 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2416 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2417 | if (!fc_em_cachep) | |
2418 | return -ENOMEM; | |
2419 | ||
e4bc50be VD |
2420 | /* |
2421 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2422 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2423 | * to order of 2's * power and order is stored | |
2424 | * in fc_cpu_order as this is later required in | |
2425 | * mapping between an exch id and exch array index | |
2426 | * in per cpu exch pool. | |
2427 | * | |
2428 | * This round up is required to align fc_cpu_mask | |
2429 | * to exchange id's lower bits such that all incoming | |
2430 | * frames of an exchange gets delivered to the same | |
2431 | * cpu on which exchange originated by simple bitwise | |
2432 | * AND operation between fc_cpu_mask and exchange id. | |
2433 | */ | |
2434 | fc_cpu_mask = 1; | |
2435 | fc_cpu_order = 0; | |
2436 | while (fc_cpu_mask < nr_cpu_ids) { | |
2437 | fc_cpu_mask <<= 1; | |
2438 | fc_cpu_order++; | |
2439 | } | |
2440 | fc_cpu_mask--; | |
2441 | ||
4ae1e19f VD |
2442 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
2443 | if (!fc_exch_workqueue) | |
2444 | return -ENOMEM; | |
42e9a92f RL |
2445 | return 0; |
2446 | } | |
42e9a92f | 2447 | |
3a3b42bf RL |
2448 | /** |
2449 | * fc_destroy_exch_mgr() - Destroy an exchange manager | |
2450 | */ | |
55204909 | 2451 | void fc_destroy_exch_mgr(void) |
42e9a92f | 2452 | { |
4ae1e19f | 2453 | destroy_workqueue(fc_exch_workqueue); |
42e9a92f RL |
2454 | kmem_cache_destroy(fc_em_cachep); |
2455 | } |