]>
Commit | Line | Data |
---|---|---|
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 { | |
e17b4af7 VD |
68 | spinlock_t lock; |
69 | struct list_head ex_list; | |
3a3b42bf RL |
70 | u16 next_index; |
71 | u16 total_exches; | |
2034c19c HD |
72 | |
73 | /* two cache of free slot in exch array */ | |
74 | u16 left; | |
75 | u16 right; | |
e17b4af7 | 76 | } ____cacheline_aligned_in_smp; |
e4bc50be | 77 | |
3a3b42bf RL |
78 | /** |
79 | * struct fc_exch_mgr - The Exchange Manager (EM). | |
80 | * @class: Default class for new sequences | |
81 | * @kref: Reference counter | |
82 | * @min_xid: Minimum exchange ID | |
83 | * @max_xid: Maximum exchange ID | |
84 | * @ep_pool: Reserved exchange pointers | |
85 | * @pool_max_index: Max exch array index in exch pool | |
86 | * @pool: Per cpu exch pool | |
87 | * @stats: Statistics structure | |
42e9a92f RL |
88 | * |
89 | * This structure is the center for creating exchanges and sequences. | |
90 | * It manages the allocation of exchange IDs. | |
91 | */ | |
92 | struct fc_exch_mgr { | |
e17b4af7 VD |
93 | struct fc_exch_pool *pool; |
94 | mempool_t *ep_pool; | |
3a3b42bf RL |
95 | enum fc_class class; |
96 | struct kref kref; | |
97 | u16 min_xid; | |
98 | u16 max_xid; | |
3a3b42bf | 99 | u16 pool_max_index; |
42e9a92f RL |
100 | |
101 | /* | |
102 | * currently exchange mgr stats are updated but not used. | |
103 | * either stats can be expose via sysfs or remove them | |
104 | * all together if not used XXX | |
105 | */ | |
106 | struct { | |
107 | atomic_t no_free_exch; | |
108 | atomic_t no_free_exch_xid; | |
109 | atomic_t xid_not_found; | |
110 | atomic_t xid_busy; | |
111 | atomic_t seq_not_found; | |
112 | atomic_t non_bls_resp; | |
113 | } stats; | |
42e9a92f | 114 | }; |
42e9a92f | 115 | |
3a3b42bf RL |
116 | /** |
117 | * struct fc_exch_mgr_anchor - primary structure for list of EMs | |
118 | * @ema_list: Exchange Manager Anchor list | |
119 | * @mp: Exchange Manager associated with this anchor | |
120 | * @match: Routine to determine if this anchor's EM should be used | |
121 | * | |
122 | * When walking the list of anchors the match routine will be called | |
123 | * for each anchor to determine if that EM should be used. The last | |
124 | * anchor in the list will always match to handle any exchanges not | |
125 | * handled by other EMs. The non-default EMs would be added to the | |
126 | * anchor list by HW that provides FCoE offloads. | |
127 | */ | |
96316099 VD |
128 | struct fc_exch_mgr_anchor { |
129 | struct list_head ema_list; | |
130 | struct fc_exch_mgr *mp; | |
131 | bool (*match)(struct fc_frame *); | |
132 | }; | |
133 | ||
42e9a92f | 134 | static void fc_exch_rrq(struct fc_exch *); |
92261156 JE |
135 | static void fc_seq_ls_acc(struct fc_frame *); |
136 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, | |
42e9a92f | 137 | enum fc_els_rjt_explan); |
92261156 JE |
138 | static void fc_exch_els_rec(struct fc_frame *); |
139 | static void fc_exch_els_rrq(struct fc_frame *); | |
42e9a92f RL |
140 | |
141 | /* | |
142 | * Internal implementation notes. | |
143 | * | |
144 | * The exchange manager is one by default in libfc but LLD may choose | |
145 | * to have one per CPU. The sequence manager is one per exchange manager | |
146 | * and currently never separated. | |
147 | * | |
148 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
149 | * assigned by the Sequence Initiator that shall be unique for a specific | |
150 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
151 | * qualified by exchange ID, which one might think it would be. | |
152 | * In practice this limits the number of open sequences and exchanges to 256 | |
153 | * per session. For most targets we could treat this limit as per exchange. | |
154 | * | |
155 | * The exchange and its sequence are freed when the last sequence is received. | |
156 | * It's possible for the remote port to leave an exchange open without | |
157 | * sending any sequences. | |
158 | * | |
159 | * Notes on reference counts: | |
160 | * | |
161 | * Exchanges are reference counted and exchange gets freed when the reference | |
162 | * count becomes zero. | |
163 | * | |
164 | * Timeouts: | |
165 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
166 | * | |
167 | * Sequence event handling: | |
168 | * | |
169 | * The following events may occur on initiator sequences: | |
170 | * | |
171 | * Send. | |
172 | * For now, the whole thing is sent. | |
173 | * Receive ACK | |
174 | * This applies only to class F. | |
175 | * The sequence is marked complete. | |
176 | * ULP completion. | |
177 | * The upper layer calls fc_exch_done() when done | |
178 | * with exchange and sequence tuple. | |
179 | * RX-inferred completion. | |
180 | * When we receive the next sequence on the same exchange, we can | |
181 | * retire the previous sequence ID. (XXX not implemented). | |
182 | * Timeout. | |
183 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
184 | * E_D_TOV causes abort and calls upper layer response handler | |
185 | * with FC_EX_TIMEOUT error. | |
186 | * Receive RJT | |
187 | * XXX defer. | |
188 | * Send ABTS | |
189 | * On timeout. | |
190 | * | |
191 | * The following events may occur on recipient sequences: | |
192 | * | |
193 | * Receive | |
194 | * Allocate sequence for first frame received. | |
195 | * Hold during receive handler. | |
196 | * Release when final frame received. | |
197 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
198 | * Receive ABTS | |
199 | * Deallocate sequence | |
200 | * Send RJT | |
201 | * Deallocate | |
202 | * | |
203 | * For now, we neglect conditions where only part of a sequence was | |
204 | * received or transmitted, or where out-of-order receipt is detected. | |
205 | */ | |
206 | ||
207 | /* | |
208 | * Locking notes: | |
209 | * | |
210 | * The EM code run in a per-CPU worker thread. | |
211 | * | |
212 | * To protect against concurrency between a worker thread code and timers, | |
213 | * sequence allocation and deallocation must be locked. | |
214 | * - exchange refcnt can be done atomicly without locks. | |
215 | * - sequence allocation must be locked by exch lock. | |
b2f0091f VD |
216 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
217 | * EM pool lock must be taken before the ex_lock. | |
42e9a92f RL |
218 | */ |
219 | ||
220 | /* | |
221 | * opcode names for debugging. | |
222 | */ | |
223 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
224 | ||
3a3b42bf RL |
225 | /** |
226 | * fc_exch_name_lookup() - Lookup name by opcode | |
227 | * @op: Opcode to be looked up | |
228 | * @table: Opcode/name table | |
229 | * @max_index: Index not to be exceeded | |
230 | * | |
231 | * This routine is used to determine a human-readable string identifying | |
232 | * a R_CTL opcode. | |
233 | */ | |
42e9a92f RL |
234 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
235 | unsigned int max_index) | |
236 | { | |
237 | const char *name = NULL; | |
238 | ||
239 | if (op < max_index) | |
240 | name = table[op]; | |
241 | if (!name) | |
242 | name = "unknown"; | |
243 | return name; | |
244 | } | |
245 | ||
3a3b42bf RL |
246 | /** |
247 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() | |
248 | * @op: The opcode to be looked up | |
249 | */ | |
42e9a92f RL |
250 | static const char *fc_exch_rctl_name(unsigned int op) |
251 | { | |
252 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
7156fffa | 253 | ARRAY_SIZE(fc_exch_rctl_names)); |
42e9a92f RL |
254 | } |
255 | ||
3a3b42bf RL |
256 | /** |
257 | * fc_exch_hold() - Increment an exchange's reference count | |
258 | * @ep: Echange to be held | |
42e9a92f | 259 | */ |
3a3b42bf | 260 | static inline void fc_exch_hold(struct fc_exch *ep) |
42e9a92f RL |
261 | { |
262 | atomic_inc(&ep->ex_refcnt); | |
263 | } | |
264 | ||
3a3b42bf RL |
265 | /** |
266 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields | |
267 | * and determine SOF and EOF. | |
268 | * @ep: The exchange to that will use the header | |
269 | * @fp: The frame whose header is to be modified | |
270 | * @f_ctl: F_CTL bits that will be used for the frame header | |
271 | * | |
272 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, | |
273 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. | |
42e9a92f RL |
274 | */ |
275 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
276 | u32 f_ctl) | |
277 | { | |
278 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
279 | u16 fill; | |
280 | ||
281 | fr_sof(fp) = ep->class; | |
282 | if (ep->seq.cnt) | |
283 | fr_sof(fp) = fc_sof_normal(ep->class); | |
284 | ||
285 | if (f_ctl & FC_FC_END_SEQ) { | |
286 | fr_eof(fp) = FC_EOF_T; | |
287 | if (fc_sof_needs_ack(ep->class)) | |
288 | fr_eof(fp) = FC_EOF_N; | |
289 | /* | |
3a3b42bf | 290 | * From F_CTL. |
42e9a92f RL |
291 | * The number of fill bytes to make the length a 4-byte |
292 | * multiple is the low order 2-bits of the f_ctl. | |
293 | * The fill itself will have been cleared by the frame | |
294 | * allocation. | |
295 | * After this, the length will be even, as expected by | |
296 | * the transport. | |
297 | */ | |
298 | fill = fr_len(fp) & 3; | |
299 | if (fill) { | |
300 | fill = 4 - fill; | |
301 | /* TODO, this may be a problem with fragmented skb */ | |
302 | skb_put(fp_skb(fp), fill); | |
303 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
304 | } | |
305 | } else { | |
306 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
307 | fr_eof(fp) = FC_EOF_N; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Initialize remainig fh fields | |
312 | * from fc_fill_fc_hdr | |
313 | */ | |
314 | fh->fh_ox_id = htons(ep->oxid); | |
315 | fh->fh_rx_id = htons(ep->rxid); | |
316 | fh->fh_seq_id = ep->seq.id; | |
317 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
318 | } | |
319 | ||
3a3b42bf RL |
320 | /** |
321 | * fc_exch_release() - Decrement an exchange's reference count | |
322 | * @ep: Exchange to be released | |
323 | * | |
324 | * If the reference count reaches zero and the exchange is complete, | |
325 | * it is freed. | |
42e9a92f RL |
326 | */ |
327 | static void fc_exch_release(struct fc_exch *ep) | |
328 | { | |
329 | struct fc_exch_mgr *mp; | |
330 | ||
331 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
332 | mp = ep->em; | |
333 | if (ep->destructor) | |
334 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 335 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
336 | mempool_free(ep, mp->ep_pool); |
337 | } | |
338 | } | |
339 | ||
3a3b42bf RL |
340 | /** |
341 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held | |
342 | * @ep: The exchange that is complete | |
343 | */ | |
42e9a92f RL |
344 | static int fc_exch_done_locked(struct fc_exch *ep) |
345 | { | |
346 | int rc = 1; | |
347 | ||
348 | /* | |
349 | * We must check for completion in case there are two threads | |
350 | * tyring to complete this. But the rrq code will reuse the | |
351 | * ep, and in that case we only clear the resp and set it as | |
352 | * complete, so it can be reused by the timer to send the rrq. | |
353 | */ | |
354 | ep->resp = NULL; | |
355 | if (ep->state & FC_EX_DONE) | |
356 | return rc; | |
357 | ep->esb_stat |= ESB_ST_COMPLETE; | |
358 | ||
359 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
360 | ep->state |= FC_EX_DONE; | |
361 | if (cancel_delayed_work(&ep->timeout_work)) | |
362 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
363 | rc = 0; | |
364 | } | |
365 | return rc; | |
366 | } | |
367 | ||
3a3b42bf RL |
368 | /** |
369 | * fc_exch_ptr_get() - Return an exchange from an exchange pool | |
370 | * @pool: Exchange Pool to get an exchange from | |
371 | * @index: Index of the exchange within the pool | |
372 | * | |
373 | * Use the index to get an exchange from within an exchange pool. exches | |
374 | * will point to an array of exchange pointers. The index will select | |
375 | * the exchange within the array. | |
376 | */ | |
e4bc50be VD |
377 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
378 | u16 index) | |
379 | { | |
380 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); | |
381 | return exches[index]; | |
382 | } | |
383 | ||
3a3b42bf RL |
384 | /** |
385 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool | |
386 | * @pool: The pool to assign the exchange to | |
387 | * @index: The index in the pool where the exchange will be assigned | |
388 | * @ep: The exchange to assign to the pool | |
389 | */ | |
e4bc50be VD |
390 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, |
391 | struct fc_exch *ep) | |
392 | { | |
393 | ((struct fc_exch **)(pool + 1))[index] = ep; | |
394 | } | |
395 | ||
3a3b42bf RL |
396 | /** |
397 | * fc_exch_delete() - Delete an exchange | |
398 | * @ep: The exchange to be deleted | |
399 | */ | |
b2f0091f | 400 | static void fc_exch_delete(struct fc_exch *ep) |
42e9a92f | 401 | { |
b2f0091f | 402 | struct fc_exch_pool *pool; |
2034c19c | 403 | u16 index; |
42e9a92f | 404 | |
b2f0091f VD |
405 | pool = ep->pool; |
406 | spin_lock_bh(&pool->lock); | |
407 | WARN_ON(pool->total_exches <= 0); | |
408 | pool->total_exches--; | |
2034c19c HD |
409 | |
410 | /* update cache of free slot */ | |
411 | index = (ep->xid - ep->em->min_xid) >> fc_cpu_order; | |
412 | if (pool->left == FC_XID_UNKNOWN) | |
413 | pool->left = index; | |
414 | else if (pool->right == FC_XID_UNKNOWN) | |
415 | pool->right = index; | |
416 | else | |
417 | pool->next_index = index; | |
418 | ||
419 | fc_exch_ptr_set(pool, index, NULL); | |
42e9a92f | 420 | list_del(&ep->ex_list); |
b2f0091f | 421 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
422 | fc_exch_release(ep); /* drop hold for exch in mp */ |
423 | } | |
424 | ||
3a3b42bf RL |
425 | /** |
426 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the | |
427 | * the exchange lock held | |
428 | * @ep: The exchange whose timer will start | |
429 | * @timer_msec: The timeout period | |
430 | * | |
431 | * Used for upper level protocols to time out the exchange. | |
432 | * The timer is cancelled when it fires or when the exchange completes. | |
42e9a92f RL |
433 | */ |
434 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
435 | unsigned int timer_msec) | |
436 | { | |
437 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
438 | return; | |
439 | ||
cd305ce4 | 440 | FC_EXCH_DBG(ep, "Exchange timer armed\n"); |
7414705e | 441 | |
4ae1e19f VD |
442 | if (queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, |
443 | msecs_to_jiffies(timer_msec))) | |
42e9a92f RL |
444 | fc_exch_hold(ep); /* hold for timer */ |
445 | } | |
446 | ||
3a3b42bf RL |
447 | /** |
448 | * fc_exch_timer_set() - Lock the exchange and set the timer | |
449 | * @ep: The exchange whose timer will start | |
450 | * @timer_msec: The timeout period | |
42e9a92f RL |
451 | */ |
452 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
453 | { | |
454 | spin_lock_bh(&ep->ex_lock); | |
455 | fc_exch_timer_set_locked(ep, timer_msec); | |
456 | spin_unlock_bh(&ep->ex_lock); | |
457 | } | |
458 | ||
1a7b75ae | 459 | /** |
3a3b42bf RL |
460 | * fc_seq_send() - Send a frame using existing sequence/exchange pair |
461 | * @lport: The local port that the exchange will be sent on | |
462 | * @sp: The sequence to be sent | |
463 | * @fp: The frame to be sent on the exchange | |
1a7b75ae | 464 | */ |
3a3b42bf | 465 | static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, |
1a7b75ae RL |
466 | struct fc_frame *fp) |
467 | { | |
468 | struct fc_exch *ep; | |
469 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
470 | int error; | |
3a3b42bf | 471 | u32 f_ctl; |
14fc315f | 472 | u8 fh_type = fh->fh_type; |
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 | 496 | |
14fc315f | 497 | if (fh_type == FC_TYPE_BLS) |
77a2b73a VD |
498 | return error; |
499 | ||
1a7b75ae RL |
500 | /* |
501 | * Update the exchange and sequence flags, | |
502 | * assuming all frames for the sequence have been sent. | |
503 | * We can only be called to send once for each sequence. | |
504 | */ | |
505 | spin_lock_bh(&ep->ex_lock); | |
506 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ | |
cc3593d3 | 507 | if (f_ctl & FC_FC_SEQ_INIT) |
1a7b75ae RL |
508 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
509 | spin_unlock_bh(&ep->ex_lock); | |
510 | return error; | |
511 | } | |
512 | ||
513 | /** | |
3a3b42bf RL |
514 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
515 | * @ep: The exchange to allocate a new sequence for | |
516 | * @seq_id: The sequence ID to be used | |
1a7b75ae RL |
517 | * |
518 | * We don't support multiple originated sequences on the same exchange. | |
519 | * By implication, any previously originated sequence on this exchange | |
520 | * is complete, and we reallocate the same sequence. | |
521 | */ | |
522 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
523 | { | |
524 | struct fc_seq *sp; | |
525 | ||
526 | sp = &ep->seq; | |
527 | sp->ssb_stat = 0; | |
528 | sp->cnt = 0; | |
529 | sp->id = seq_id; | |
530 | return sp; | |
531 | } | |
532 | ||
3a3b42bf RL |
533 | /** |
534 | * fc_seq_start_next_locked() - Allocate a new sequence on the same | |
535 | * exchange as the supplied sequence | |
536 | * @sp: The sequence/exchange to get a new sequence for | |
537 | */ | |
1a7b75ae RL |
538 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
539 | { | |
540 | struct fc_exch *ep = fc_seq_exch(sp); | |
541 | ||
542 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
543 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", | |
544 | ep->f_ctl, sp->id); | |
545 | return sp; | |
546 | } | |
547 | ||
548 | /** | |
3a3b42bf RL |
549 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
550 | * for a given sequence/exchange pair | |
551 | * @sp: The sequence/exchange to get a new exchange for | |
1a7b75ae RL |
552 | */ |
553 | static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
554 | { | |
555 | struct fc_exch *ep = fc_seq_exch(sp); | |
556 | ||
557 | spin_lock_bh(&ep->ex_lock); | |
558 | sp = fc_seq_start_next_locked(sp); | |
559 | spin_unlock_bh(&ep->ex_lock); | |
560 | ||
561 | return sp; | |
562 | } | |
563 | ||
1a5c2d7e JE |
564 | /* |
565 | * Set the response handler for the exchange associated with a sequence. | |
566 | */ | |
567 | static void fc_seq_set_resp(struct fc_seq *sp, | |
568 | void (*resp)(struct fc_seq *, struct fc_frame *, | |
569 | void *), | |
570 | void *arg) | |
571 | { | |
572 | struct fc_exch *ep = fc_seq_exch(sp); | |
573 | ||
574 | spin_lock_bh(&ep->ex_lock); | |
575 | ep->resp = resp; | |
576 | ep->arg = arg; | |
577 | spin_unlock_bh(&ep->ex_lock); | |
578 | } | |
579 | ||
1a7b75ae | 580 | /** |
77a2b73a VD |
581 | * fc_exch_abort_locked() - Abort an exchange |
582 | * @ep: The exchange to be aborted | |
3a3b42bf RL |
583 | * @timer_msec: The period of time to wait before aborting |
584 | * | |
77a2b73a VD |
585 | * Locking notes: Called with exch lock held |
586 | * | |
587 | * Return value: 0 on success else error code | |
1a7b75ae | 588 | */ |
77a2b73a VD |
589 | static int fc_exch_abort_locked(struct fc_exch *ep, |
590 | unsigned int timer_msec) | |
42e9a92f RL |
591 | { |
592 | struct fc_seq *sp; | |
42e9a92f RL |
593 | struct fc_frame *fp; |
594 | int error; | |
595 | ||
42e9a92f | 596 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || |
77a2b73a | 597 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) |
42e9a92f | 598 | return -ENXIO; |
42e9a92f RL |
599 | |
600 | /* | |
601 | * Send the abort on a new sequence if possible. | |
602 | */ | |
603 | sp = fc_seq_start_next_locked(&ep->seq); | |
77a2b73a | 604 | if (!sp) |
42e9a92f | 605 | return -ENOMEM; |
42e9a92f RL |
606 | |
607 | ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL; | |
608 | if (timer_msec) | |
609 | fc_exch_timer_set_locked(ep, timer_msec); | |
42e9a92f RL |
610 | |
611 | /* | |
612 | * If not logged into the fabric, don't send ABTS but leave | |
613 | * sequence active until next timeout. | |
614 | */ | |
615 | if (!ep->sid) | |
616 | return 0; | |
617 | ||
618 | /* | |
619 | * Send an abort for the sequence that timed out. | |
620 | */ | |
621 | fp = fc_frame_alloc(ep->lp, 0); | |
622 | if (fp) { | |
623 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
624 | FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
625 | error = fc_seq_send(ep->lp, sp, fp); | |
626 | } else | |
627 | error = -ENOBUFS; | |
628 | return error; | |
629 | } | |
42e9a92f | 630 | |
77a2b73a VD |
631 | /** |
632 | * fc_seq_exch_abort() - Abort an exchange and sequence | |
633 | * @req_sp: The sequence to be aborted | |
634 | * @timer_msec: The period of time to wait before aborting | |
635 | * | |
636 | * Generally called because of a timeout or an abort from the upper layer. | |
637 | * | |
638 | * Return value: 0 on success else error code | |
639 | */ | |
640 | static int fc_seq_exch_abort(const struct fc_seq *req_sp, | |
641 | unsigned int timer_msec) | |
642 | { | |
643 | struct fc_exch *ep; | |
644 | int error; | |
645 | ||
646 | ep = fc_seq_exch(req_sp); | |
647 | spin_lock_bh(&ep->ex_lock); | |
648 | error = fc_exch_abort_locked(ep, timer_msec); | |
649 | spin_unlock_bh(&ep->ex_lock); | |
650 | return error; | |
651 | } | |
652 | ||
3a3b42bf RL |
653 | /** |
654 | * fc_exch_timeout() - Handle exchange timer expiration | |
655 | * @work: The work_struct identifying the exchange that timed out | |
42e9a92f RL |
656 | */ |
657 | static void fc_exch_timeout(struct work_struct *work) | |
658 | { | |
659 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
660 | timeout_work.work); | |
661 | struct fc_seq *sp = &ep->seq; | |
662 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
663 | void *arg; | |
664 | u32 e_stat; | |
665 | int rc = 1; | |
666 | ||
cd305ce4 RL |
667 | FC_EXCH_DBG(ep, "Exchange timed out\n"); |
668 | ||
42e9a92f RL |
669 | spin_lock_bh(&ep->ex_lock); |
670 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
671 | goto unlock; | |
672 | ||
673 | e_stat = ep->esb_stat; | |
674 | if (e_stat & ESB_ST_COMPLETE) { | |
675 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 676 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
677 | if (e_stat & ESB_ST_REC_QUAL) |
678 | fc_exch_rrq(ep); | |
42e9a92f RL |
679 | goto done; |
680 | } else { | |
681 | resp = ep->resp; | |
682 | arg = ep->arg; | |
683 | ep->resp = NULL; | |
684 | if (e_stat & ESB_ST_ABNORMAL) | |
685 | rc = fc_exch_done_locked(ep); | |
686 | spin_unlock_bh(&ep->ex_lock); | |
f3162483 PN |
687 | if (!rc) |
688 | fc_exch_delete(ep); | |
42e9a92f RL |
689 | if (resp) |
690 | resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg); | |
691 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); | |
692 | goto done; | |
693 | } | |
694 | unlock: | |
695 | spin_unlock_bh(&ep->ex_lock); | |
696 | done: | |
697 | /* | |
698 | * This release matches the hold taken when the timer was set. | |
699 | */ | |
700 | fc_exch_release(ep); | |
701 | } | |
702 | ||
52ff878c | 703 | /** |
3a3b42bf RL |
704 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
705 | * @lport: The local port that the exchange is for | |
706 | * @mp: The exchange manager that will allocate the exchange | |
42e9a92f | 707 | * |
d7179680 | 708 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 709 | */ |
52ff878c | 710 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 711 | struct fc_exch_mgr *mp) |
42e9a92f RL |
712 | { |
713 | struct fc_exch *ep; | |
b2f0091f VD |
714 | unsigned int cpu; |
715 | u16 index; | |
716 | struct fc_exch_pool *pool; | |
42e9a92f RL |
717 | |
718 | /* allocate memory for exchange */ | |
719 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
720 | if (!ep) { | |
721 | atomic_inc(&mp->stats.no_free_exch); | |
722 | goto out; | |
723 | } | |
724 | memset(ep, 0, sizeof(*ep)); | |
725 | ||
f018b73a | 726 | cpu = get_cpu(); |
b2f0091f VD |
727 | pool = per_cpu_ptr(mp->pool, cpu); |
728 | spin_lock_bh(&pool->lock); | |
f018b73a | 729 | put_cpu(); |
2034c19c HD |
730 | |
731 | /* peek cache of free slot */ | |
732 | if (pool->left != FC_XID_UNKNOWN) { | |
733 | index = pool->left; | |
734 | pool->left = FC_XID_UNKNOWN; | |
735 | goto hit; | |
736 | } | |
737 | if (pool->right != FC_XID_UNKNOWN) { | |
738 | index = pool->right; | |
739 | pool->right = FC_XID_UNKNOWN; | |
740 | goto hit; | |
741 | } | |
742 | ||
b2f0091f VD |
743 | index = pool->next_index; |
744 | /* allocate new exch from pool */ | |
745 | while (fc_exch_ptr_get(pool, index)) { | |
746 | index = index == mp->pool_max_index ? 0 : index + 1; | |
747 | if (index == pool->next_index) | |
42e9a92f | 748 | goto err; |
42e9a92f | 749 | } |
b2f0091f | 750 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
2034c19c | 751 | hit: |
42e9a92f RL |
752 | fc_exch_hold(ep); /* hold for exch in mp */ |
753 | spin_lock_init(&ep->ex_lock); | |
754 | /* | |
755 | * Hold exch lock for caller to prevent fc_exch_reset() | |
756 | * from releasing exch while fc_exch_alloc() caller is | |
757 | * still working on exch. | |
758 | */ | |
759 | spin_lock_bh(&ep->ex_lock); | |
760 | ||
b2f0091f VD |
761 | fc_exch_ptr_set(pool, index, ep); |
762 | list_add_tail(&ep->ex_list, &pool->ex_list); | |
42e9a92f | 763 | fc_seq_alloc(ep, ep->seq_id++); |
b2f0091f VD |
764 | pool->total_exches++; |
765 | spin_unlock_bh(&pool->lock); | |
42e9a92f RL |
766 | |
767 | /* | |
768 | * update exchange | |
769 | */ | |
b2f0091f | 770 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
42e9a92f | 771 | ep->em = mp; |
b2f0091f | 772 | ep->pool = pool; |
52ff878c | 773 | ep->lp = lport; |
42e9a92f RL |
774 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
775 | ep->rxid = FC_XID_UNKNOWN; | |
776 | ep->class = mp->class; | |
777 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); | |
778 | out: | |
779 | return ep; | |
780 | err: | |
b2f0091f | 781 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
782 | atomic_inc(&mp->stats.no_free_exch_xid); |
783 | mempool_free(ep, mp->ep_pool); | |
784 | return NULL; | |
785 | } | |
52ff878c VD |
786 | |
787 | /** | |
3a3b42bf RL |
788 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
789 | * local port's list of EMs. | |
790 | * @lport: The local port that will own the exchange | |
791 | * @fp: The FC frame that the exchange will be for | |
52ff878c | 792 | * |
3a3b42bf RL |
793 | * This function walks the list of exchange manager(EM) |
794 | * anchors to select an EM for a new exchange allocation. The | |
795 | * EM is selected when a NULL match function pointer is encountered | |
796 | * or when a call to a match function returns true. | |
52ff878c | 797 | */ |
3e22760d VD |
798 | static inline struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
799 | struct fc_frame *fp) | |
52ff878c VD |
800 | { |
801 | struct fc_exch_mgr_anchor *ema; | |
52ff878c | 802 | |
3e22760d VD |
803 | list_for_each_entry(ema, &lport->ema_list, ema_list) |
804 | if (!ema->match || ema->match(fp)) | |
805 | return fc_exch_em_alloc(lport, ema->mp); | |
52ff878c VD |
806 | return NULL; |
807 | } | |
42e9a92f | 808 | |
3a3b42bf RL |
809 | /** |
810 | * fc_exch_find() - Lookup and hold an exchange | |
811 | * @mp: The exchange manager to lookup the exchange from | |
812 | * @xid: The XID of the exchange to look up | |
42e9a92f RL |
813 | */ |
814 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
815 | { | |
b2f0091f | 816 | struct fc_exch_pool *pool; |
42e9a92f RL |
817 | struct fc_exch *ep = NULL; |
818 | ||
819 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
b2f0091f VD |
820 | pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask); |
821 | spin_lock_bh(&pool->lock); | |
822 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); | |
324f6678 | 823 | if (ep && ep->xid == xid) |
42e9a92f | 824 | fc_exch_hold(ep); |
b2f0091f | 825 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
826 | } |
827 | return ep; | |
828 | } | |
829 | ||
1a7b75ae RL |
830 | |
831 | /** | |
832 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and | |
3a3b42bf RL |
833 | * the memory allocated for the related objects may be freed. |
834 | * @sp: The sequence that has completed | |
1a7b75ae RL |
835 | */ |
836 | static void fc_exch_done(struct fc_seq *sp) | |
42e9a92f RL |
837 | { |
838 | struct fc_exch *ep = fc_seq_exch(sp); | |
839 | int rc; | |
840 | ||
841 | spin_lock_bh(&ep->ex_lock); | |
842 | rc = fc_exch_done_locked(ep); | |
843 | spin_unlock_bh(&ep->ex_lock); | |
844 | if (!rc) | |
b2f0091f | 845 | fc_exch_delete(ep); |
42e9a92f | 846 | } |
42e9a92f | 847 | |
3a3b42bf RL |
848 | /** |
849 | * fc_exch_resp() - Allocate a new exchange for a response frame | |
850 | * @lport: The local port that the exchange was for | |
851 | * @mp: The exchange manager to allocate the exchange from | |
852 | * @fp: The response frame | |
853 | * | |
42e9a92f RL |
854 | * Sets the responder ID in the frame header. |
855 | */ | |
52ff878c VD |
856 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
857 | struct fc_exch_mgr *mp, | |
858 | struct fc_frame *fp) | |
42e9a92f RL |
859 | { |
860 | struct fc_exch *ep; | |
861 | struct fc_frame_header *fh; | |
42e9a92f | 862 | |
52ff878c | 863 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
864 | if (ep) { |
865 | ep->class = fc_frame_class(fp); | |
866 | ||
867 | /* | |
868 | * Set EX_CTX indicating we're responding on this exchange. | |
869 | */ | |
870 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
871 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
872 | fh = fc_frame_header_get(fp); | |
873 | ep->sid = ntoh24(fh->fh_d_id); | |
874 | ep->did = ntoh24(fh->fh_s_id); | |
875 | ep->oid = ep->did; | |
876 | ||
877 | /* | |
878 | * Allocated exchange has placed the XID in the | |
879 | * originator field. Move it to the responder field, | |
880 | * and set the originator XID from the frame. | |
881 | */ | |
882 | ep->rxid = ep->xid; | |
883 | ep->oxid = ntohs(fh->fh_ox_id); | |
884 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
885 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
886 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
887 | ||
42e9a92f | 888 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 889 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
890 | } |
891 | return ep; | |
892 | } | |
893 | ||
3a3b42bf RL |
894 | /** |
895 | * fc_seq_lookup_recip() - Find a sequence where the other end | |
896 | * originated the sequence | |
897 | * @lport: The local port that the frame was sent to | |
898 | * @mp: The Exchange Manager to lookup the exchange from | |
899 | * @fp: The frame associated with the sequence we're looking for | |
900 | * | |
42e9a92f RL |
901 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
902 | * on the ep that should be released by the caller. | |
903 | */ | |
52ff878c VD |
904 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
905 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 906 | struct fc_frame *fp) |
42e9a92f RL |
907 | { |
908 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
909 | struct fc_exch *ep = NULL; | |
910 | struct fc_seq *sp = NULL; | |
911 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
912 | u32 f_ctl; | |
913 | u16 xid; | |
914 | ||
915 | f_ctl = ntoh24(fh->fh_f_ctl); | |
916 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
917 | ||
918 | /* | |
919 | * Lookup or create the exchange if we will be creating the sequence. | |
920 | */ | |
921 | if (f_ctl & FC_FC_EX_CTX) { | |
922 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
923 | ep = fc_exch_find(mp, xid); | |
924 | if (!ep) { | |
925 | atomic_inc(&mp->stats.xid_not_found); | |
926 | reject = FC_RJT_OX_ID; | |
927 | goto out; | |
928 | } | |
929 | if (ep->rxid == FC_XID_UNKNOWN) | |
930 | ep->rxid = ntohs(fh->fh_rx_id); | |
931 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
932 | reject = FC_RJT_OX_ID; | |
933 | goto rel; | |
934 | } | |
935 | } else { | |
936 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
937 | ||
938 | /* | |
939 | * Special case for MDS issuing an ELS TEST with a | |
940 | * bad rxid of 0. | |
941 | * XXX take this out once we do the proper reject. | |
942 | */ | |
943 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
944 | fc_frame_payload_op(fp) == ELS_TEST) { | |
945 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
946 | xid = FC_XID_UNKNOWN; | |
947 | } | |
948 | ||
949 | /* | |
950 | * new sequence - find the exchange | |
951 | */ | |
952 | ep = fc_exch_find(mp, xid); | |
953 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
954 | if (ep) { | |
955 | atomic_inc(&mp->stats.xid_busy); | |
956 | reject = FC_RJT_RX_ID; | |
957 | goto rel; | |
958 | } | |
52ff878c | 959 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
960 | if (!ep) { |
961 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
962 | goto out; | |
963 | } | |
964 | xid = ep->xid; /* get our XID */ | |
965 | } else if (!ep) { | |
966 | atomic_inc(&mp->stats.xid_not_found); | |
967 | reject = FC_RJT_RX_ID; /* XID not found */ | |
968 | goto out; | |
969 | } | |
970 | } | |
971 | ||
972 | /* | |
973 | * At this point, we have the exchange held. | |
974 | * Find or create the sequence. | |
975 | */ | |
976 | if (fc_sof_is_init(fr_sof(fp))) { | |
a104c844 | 977 | sp = &ep->seq; |
42e9a92f | 978 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 | 979 | sp->id = fh->fh_seq_id; |
42e9a92f RL |
980 | } else { |
981 | sp = &ep->seq; | |
982 | if (sp->id != fh->fh_seq_id) { | |
983 | atomic_inc(&mp->stats.seq_not_found); | |
e3e65c69 KP |
984 | if (f_ctl & FC_FC_END_SEQ) { |
985 | /* | |
986 | * Update sequence_id based on incoming last | |
987 | * frame of sequence exchange. This is needed | |
988 | * for FCoE target where DDP has been used | |
989 | * on target where, stack is indicated only | |
990 | * about last frame's (payload _header) header. | |
991 | * Whereas "seq_id" which is part of | |
992 | * frame_header is allocated by initiator | |
993 | * which is totally different from "seq_id" | |
994 | * allocated when XFER_RDY was sent by target. | |
995 | * To avoid false -ve which results into not | |
996 | * sending RSP, hence write request on other | |
997 | * end never finishes. | |
998 | */ | |
999 | spin_lock_bh(&ep->ex_lock); | |
1000 | sp->ssb_stat |= SSB_ST_RESP; | |
1001 | sp->id = fh->fh_seq_id; | |
1002 | spin_unlock_bh(&ep->ex_lock); | |
1003 | } else { | |
1004 | /* sequence/exch should exist */ | |
1005 | reject = FC_RJT_SEQ_ID; | |
1006 | goto rel; | |
1007 | } | |
42e9a92f RL |
1008 | } |
1009 | } | |
1010 | WARN_ON(ep != fc_seq_exch(sp)); | |
1011 | ||
1012 | if (f_ctl & FC_FC_SEQ_INIT) | |
1013 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1014 | ||
1015 | fr_seq(fp) = sp; | |
1016 | out: | |
1017 | return reject; | |
1018 | rel: | |
1019 | fc_exch_done(&ep->seq); | |
1020 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
1021 | return reject; | |
1022 | } | |
1023 | ||
3a3b42bf RL |
1024 | /** |
1025 | * fc_seq_lookup_orig() - Find a sequence where this end | |
1026 | * originated the sequence | |
1027 | * @mp: The Exchange Manager to lookup the exchange from | |
1028 | * @fp: The frame associated with the sequence we're looking for | |
1029 | * | |
42e9a92f RL |
1030 | * Does not hold the sequence for the caller. |
1031 | */ | |
1032 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
1033 | struct fc_frame *fp) | |
1034 | { | |
1035 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1036 | struct fc_exch *ep; | |
1037 | struct fc_seq *sp = NULL; | |
1038 | u32 f_ctl; | |
1039 | u16 xid; | |
1040 | ||
1041 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1042 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
1043 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
1044 | ep = fc_exch_find(mp, xid); | |
1045 | if (!ep) | |
1046 | return NULL; | |
1047 | if (ep->seq.id == fh->fh_seq_id) { | |
1048 | /* | |
1049 | * Save the RX_ID if we didn't previously know it. | |
1050 | */ | |
1051 | sp = &ep->seq; | |
1052 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
1053 | ep->rxid == FC_XID_UNKNOWN) { | |
1054 | ep->rxid = ntohs(fh->fh_rx_id); | |
1055 | } | |
1056 | } | |
1057 | fc_exch_release(ep); | |
1058 | return sp; | |
1059 | } | |
1060 | ||
3a3b42bf RL |
1061 | /** |
1062 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange | |
1063 | * @ep: The exchange to set the addresses for | |
1064 | * @orig_id: The originator's ID | |
1065 | * @resp_id: The responder's ID | |
1066 | * | |
42e9a92f RL |
1067 | * Note this must be done before the first sequence of the exchange is sent. |
1068 | */ | |
1069 | static void fc_exch_set_addr(struct fc_exch *ep, | |
1070 | u32 orig_id, u32 resp_id) | |
1071 | { | |
1072 | ep->oid = orig_id; | |
1073 | if (ep->esb_stat & ESB_ST_RESP) { | |
1074 | ep->sid = resp_id; | |
1075 | ep->did = orig_id; | |
1076 | } else { | |
1077 | ep->sid = orig_id; | |
1078 | ep->did = resp_id; | |
1079 | } | |
1080 | } | |
1081 | ||
1a7b75ae | 1082 | /** |
25985edc | 1083 | * fc_seq_els_rsp_send() - Send an ELS response using information from |
3a3b42bf | 1084 | * the existing sequence/exchange. |
92261156 | 1085 | * @fp: The received frame |
3a3b42bf RL |
1086 | * @els_cmd: The ELS command to be sent |
1087 | * @els_data: The ELS data to be sent | |
92261156 JE |
1088 | * |
1089 | * The received frame is not freed. | |
42e9a92f | 1090 | */ |
92261156 | 1091 | static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, |
1a7b75ae | 1092 | struct fc_seq_els_data *els_data) |
42e9a92f RL |
1093 | { |
1094 | switch (els_cmd) { | |
1095 | case ELS_LS_RJT: | |
92261156 | 1096 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); |
42e9a92f RL |
1097 | break; |
1098 | case ELS_LS_ACC: | |
92261156 | 1099 | fc_seq_ls_acc(fp); |
42e9a92f RL |
1100 | break; |
1101 | case ELS_RRQ: | |
92261156 | 1102 | fc_exch_els_rrq(fp); |
42e9a92f RL |
1103 | break; |
1104 | case ELS_REC: | |
92261156 | 1105 | fc_exch_els_rec(fp); |
42e9a92f RL |
1106 | break; |
1107 | default: | |
92261156 | 1108 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
1109 | } |
1110 | } | |
42e9a92f | 1111 | |
3a3b42bf RL |
1112 | /** |
1113 | * fc_seq_send_last() - Send a sequence that is the last in the exchange | |
1114 | * @sp: The sequence that is to be sent | |
1115 | * @fp: The frame that will be sent on the sequence | |
1116 | * @rctl: The R_CTL information to be sent | |
1117 | * @fh_type: The frame header type | |
42e9a92f RL |
1118 | */ |
1119 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
1120 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
1121 | { | |
1122 | u32 f_ctl; | |
1123 | struct fc_exch *ep = fc_seq_exch(sp); | |
1124 | ||
1125 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1126 | f_ctl |= ep->f_ctl; | |
1127 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
1128 | fc_seq_send(ep->lp, sp, fp); | |
1129 | } | |
1130 | ||
3a3b42bf RL |
1131 | /** |
1132 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame | |
1133 | * @sp: The sequence to send the ACK on | |
1134 | * @rx_fp: The received frame that is being acknoledged | |
1135 | * | |
42e9a92f | 1136 | * Send ACK_1 (or equiv.) indicating we received something. |
42e9a92f RL |
1137 | */ |
1138 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
1139 | { | |
1140 | struct fc_frame *fp; | |
1141 | struct fc_frame_header *rx_fh; | |
1142 | struct fc_frame_header *fh; | |
1143 | struct fc_exch *ep = fc_seq_exch(sp); | |
3a3b42bf | 1144 | struct fc_lport *lport = ep->lp; |
42e9a92f RL |
1145 | unsigned int f_ctl; |
1146 | ||
1147 | /* | |
1148 | * Don't send ACKs for class 3. | |
1149 | */ | |
1150 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
3a3b42bf | 1151 | fp = fc_frame_alloc(lport, 0); |
42e9a92f RL |
1152 | if (!fp) |
1153 | return; | |
1154 | ||
1155 | fh = fc_frame_header_get(fp); | |
1156 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
1157 | fh->fh_type = FC_TYPE_BLS; | |
1158 | ||
1159 | /* | |
1160 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1161 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1162 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1163 | * Last ACK uses bits 7-6 (continue sequence), | |
1164 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1165 | */ | |
1166 | rx_fh = fc_frame_header_get(rx_fp); | |
1167 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1168 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1169 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
1170 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1171 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1172 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1173 | hton24(fh->fh_f_ctl, f_ctl); | |
1174 | ||
1175 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
1176 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
1177 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1178 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
1179 | ||
1180 | fr_sof(fp) = fr_sof(rx_fp); | |
1181 | if (f_ctl & FC_FC_END_SEQ) | |
1182 | fr_eof(fp) = FC_EOF_T; | |
1183 | else | |
1184 | fr_eof(fp) = FC_EOF_N; | |
1185 | ||
3a3b42bf | 1186 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1187 | } |
1188 | } | |
1189 | ||
3a3b42bf RL |
1190 | /** |
1191 | * fc_exch_send_ba_rjt() - Send BLS Reject | |
1192 | * @rx_fp: The frame being rejected | |
1193 | * @reason: The reason the frame is being rejected | |
25985edc | 1194 | * @explan: The explanation for the rejection |
3a3b42bf | 1195 | * |
42e9a92f RL |
1196 | * This is for rejecting BA_ABTS only. |
1197 | */ | |
b2ab99c9 RL |
1198 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
1199 | enum fc_ba_rjt_reason reason, | |
1200 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
1201 | { |
1202 | struct fc_frame *fp; | |
1203 | struct fc_frame_header *rx_fh; | |
1204 | struct fc_frame_header *fh; | |
1205 | struct fc_ba_rjt *rp; | |
3a3b42bf | 1206 | struct fc_lport *lport; |
42e9a92f RL |
1207 | unsigned int f_ctl; |
1208 | ||
3a3b42bf RL |
1209 | lport = fr_dev(rx_fp); |
1210 | fp = fc_frame_alloc(lport, sizeof(*rp)); | |
42e9a92f RL |
1211 | if (!fp) |
1212 | return; | |
1213 | fh = fc_frame_header_get(fp); | |
1214 | rx_fh = fc_frame_header_get(rx_fp); | |
1215 | ||
1216 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1217 | ||
1218 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1219 | rp->br_reason = reason; | |
1220 | rp->br_explan = explan; | |
1221 | ||
1222 | /* | |
1223 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1224 | */ | |
1225 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1226 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1d490ce3 JE |
1227 | fh->fh_ox_id = rx_fh->fh_ox_id; |
1228 | fh->fh_rx_id = rx_fh->fh_rx_id; | |
42e9a92f RL |
1229 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
1230 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1231 | fh->fh_type = FC_TYPE_BLS; | |
1232 | ||
1233 | /* | |
1234 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1235 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1236 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1237 | * Last ACK uses bits 7-6 (continue sequence), | |
1238 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1239 | * Always set LAST_SEQ, END_SEQ. | |
1240 | */ | |
1241 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1242 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1243 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1244 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1245 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1246 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1247 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1248 | hton24(fh->fh_f_ctl, f_ctl); | |
1249 | ||
1250 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1251 | fr_eof(fp) = FC_EOF_T; | |
1252 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1253 | fr_eof(fp) = FC_EOF_N; | |
1254 | ||
3a3b42bf | 1255 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1256 | } |
1257 | ||
3a3b42bf RL |
1258 | /** |
1259 | * fc_exch_recv_abts() - Handle an incoming ABTS | |
1260 | * @ep: The exchange the abort was on | |
1261 | * @rx_fp: The ABTS frame | |
1262 | * | |
1263 | * This would be for target mode usually, but could be due to lost | |
1264 | * FCP transfer ready, confirm or RRQ. We always handle this as an | |
1265 | * exchange abort, ignoring the parameter. | |
42e9a92f RL |
1266 | */ |
1267 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1268 | { | |
1269 | struct fc_frame *fp; | |
1270 | struct fc_ba_acc *ap; | |
1271 | struct fc_frame_header *fh; | |
1272 | struct fc_seq *sp; | |
1273 | ||
1274 | if (!ep) | |
1275 | goto reject; | |
1276 | spin_lock_bh(&ep->ex_lock); | |
1277 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1278 | spin_unlock_bh(&ep->ex_lock); | |
1279 | goto reject; | |
1280 | } | |
1281 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) | |
1282 | fc_exch_hold(ep); /* hold for REC_QUAL */ | |
1283 | ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL; | |
1284 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1285 | ||
1286 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1287 | if (!fp) { | |
1288 | spin_unlock_bh(&ep->ex_lock); | |
1289 | goto free; | |
1290 | } | |
1291 | fh = fc_frame_header_get(fp); | |
1292 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1293 | memset(ap, 0, sizeof(*ap)); | |
1294 | sp = &ep->seq; | |
1295 | ap->ba_high_seq_cnt = htons(0xffff); | |
1296 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1297 | ap->ba_seq_id = sp->id; | |
1298 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1299 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1300 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1301 | } | |
a7e84f2b | 1302 | sp = fc_seq_start_next_locked(sp); |
42e9a92f RL |
1303 | spin_unlock_bh(&ep->ex_lock); |
1304 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); | |
1305 | fc_frame_free(rx_fp); | |
1306 | return; | |
1307 | ||
1308 | reject: | |
1309 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
1310 | free: | |
1311 | fc_frame_free(rx_fp); | |
1312 | } | |
1313 | ||
239e8104 JE |
1314 | /** |
1315 | * fc_seq_assign() - Assign exchange and sequence for incoming request | |
1316 | * @lport: The local port that received the request | |
1317 | * @fp: The request frame | |
1318 | * | |
1319 | * On success, the sequence pointer will be returned and also in fr_seq(@fp). | |
62bdb645 JE |
1320 | * A reference will be held on the exchange/sequence for the caller, which |
1321 | * must call fc_seq_release(). | |
239e8104 JE |
1322 | */ |
1323 | static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) | |
1324 | { | |
1325 | struct fc_exch_mgr_anchor *ema; | |
1326 | ||
1327 | WARN_ON(lport != fr_dev(fp)); | |
1328 | WARN_ON(fr_seq(fp)); | |
1329 | fr_seq(fp) = NULL; | |
1330 | ||
1331 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1332 | if ((!ema->match || ema->match(fp)) && | |
530994d6 | 1333 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) |
239e8104 JE |
1334 | break; |
1335 | return fr_seq(fp); | |
1336 | } | |
1337 | ||
62bdb645 JE |
1338 | /** |
1339 | * fc_seq_release() - Release the hold | |
1340 | * @sp: The sequence. | |
1341 | */ | |
1342 | static void fc_seq_release(struct fc_seq *sp) | |
1343 | { | |
1344 | fc_exch_release(fc_seq_exch(sp)); | |
1345 | } | |
1346 | ||
3a3b42bf | 1347 | /** |
92261156 | 1348 | * fc_exch_recv_req() - Handler for an incoming request |
3a3b42bf RL |
1349 | * @lport: The local port that received the request |
1350 | * @mp: The EM that the exchange is on | |
1351 | * @fp: The request frame | |
92261156 JE |
1352 | * |
1353 | * This is used when the other end is originating the exchange | |
1354 | * and the sequence. | |
42e9a92f | 1355 | */ |
3a3b42bf | 1356 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
42e9a92f RL |
1357 | struct fc_frame *fp) |
1358 | { | |
1359 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1360 | struct fc_seq *sp = NULL; | |
1361 | struct fc_exch *ep = NULL; | |
42e9a92f RL |
1362 | enum fc_pf_rjt_reason reject; |
1363 | ||
174e1ebf CL |
1364 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
1365 | * problem now that we know a new exchange needs to be allocated | |
1366 | */ | |
3a3b42bf RL |
1367 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
1368 | if (!lport) { | |
174e1ebf CL |
1369 | fc_frame_free(fp); |
1370 | return; | |
1371 | } | |
92261156 JE |
1372 | fr_dev(fp) = lport; |
1373 | ||
1374 | BUG_ON(fr_seq(fp)); /* XXX remove later */ | |
1375 | ||
1376 | /* | |
1377 | * If the RX_ID is 0xffff, don't allocate an exchange. | |
1378 | * The upper-level protocol may request one later, if needed. | |
1379 | */ | |
1380 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) | |
1381 | return lport->tt.lport_recv(lport, fp); | |
174e1ebf | 1382 | |
3a3b42bf | 1383 | reject = fc_seq_lookup_recip(lport, mp, fp); |
42e9a92f RL |
1384 | if (reject == FC_RJT_NONE) { |
1385 | sp = fr_seq(fp); /* sequence will be held */ | |
1386 | ep = fc_seq_exch(sp); | |
42e9a92f | 1387 | fc_seq_send_ack(sp, fp); |
f60e12e9 | 1388 | ep->encaps = fr_encaps(fp); |
42e9a92f RL |
1389 | |
1390 | /* | |
1391 | * Call the receive function. | |
1392 | * | |
1393 | * The receive function may allocate a new sequence | |
1394 | * over the old one, so we shouldn't change the | |
1395 | * sequence after this. | |
1396 | * | |
1397 | * The frame will be freed by the receive function. | |
1398 | * If new exch resp handler is valid then call that | |
1399 | * first. | |
1400 | */ | |
1401 | if (ep->resp) | |
1402 | ep->resp(sp, fp, ep->arg); | |
1403 | else | |
92261156 | 1404 | lport->tt.lport_recv(lport, fp); |
42e9a92f RL |
1405 | fc_exch_release(ep); /* release from lookup */ |
1406 | } else { | |
3a3b42bf RL |
1407 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
1408 | reject); | |
42e9a92f RL |
1409 | fc_frame_free(fp); |
1410 | } | |
1411 | } | |
1412 | ||
3a3b42bf RL |
1413 | /** |
1414 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other | |
1415 | * end is the originator of the sequence that is a | |
1416 | * response to our initial exchange | |
1417 | * @mp: The EM that the exchange is on | |
1418 | * @fp: The response frame | |
42e9a92f RL |
1419 | */ |
1420 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1421 | { | |
1422 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1423 | struct fc_seq *sp; | |
1424 | struct fc_exch *ep; | |
1425 | enum fc_sof sof; | |
1426 | u32 f_ctl; | |
1427 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1428 | void *ex_resp_arg; | |
1429 | int rc; | |
1430 | ||
1431 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1432 | if (!ep) { | |
1433 | atomic_inc(&mp->stats.xid_not_found); | |
1434 | goto out; | |
1435 | } | |
30121d14 SM |
1436 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1437 | atomic_inc(&mp->stats.xid_not_found); | |
8236554a | 1438 | goto rel; |
30121d14 | 1439 | } |
42e9a92f RL |
1440 | if (ep->rxid == FC_XID_UNKNOWN) |
1441 | ep->rxid = ntohs(fh->fh_rx_id); | |
1442 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1443 | atomic_inc(&mp->stats.xid_not_found); | |
1444 | goto rel; | |
1445 | } | |
1446 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1447 | ep->did != FC_FID_FLOGI) { | |
1448 | atomic_inc(&mp->stats.xid_not_found); | |
1449 | goto rel; | |
1450 | } | |
1451 | sof = fr_sof(fp); | |
a104c844 | 1452 | sp = &ep->seq; |
b3667f91 | 1453 | if (fc_sof_is_init(sof)) { |
42e9a92f | 1454 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 JE |
1455 | sp->id = fh->fh_seq_id; |
1456 | } else if (sp->id != fh->fh_seq_id) { | |
1457 | atomic_inc(&mp->stats.seq_not_found); | |
1458 | goto rel; | |
42e9a92f | 1459 | } |
a104c844 | 1460 | |
42e9a92f RL |
1461 | f_ctl = ntoh24(fh->fh_f_ctl); |
1462 | fr_seq(fp) = sp; | |
1463 | if (f_ctl & FC_FC_SEQ_INIT) | |
1464 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1465 | ||
1466 | if (fc_sof_needs_ack(sof)) | |
1467 | fc_seq_send_ack(sp, fp); | |
1468 | resp = ep->resp; | |
1469 | ex_resp_arg = ep->arg; | |
1470 | ||
1471 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1472 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1473 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1474 | spin_lock_bh(&ep->ex_lock); | |
8d23f4ba | 1475 | resp = ep->resp; |
42e9a92f RL |
1476 | rc = fc_exch_done_locked(ep); |
1477 | WARN_ON(fc_seq_exch(sp) != ep); | |
1478 | spin_unlock_bh(&ep->ex_lock); | |
1479 | if (!rc) | |
b2f0091f | 1480 | fc_exch_delete(ep); |
42e9a92f RL |
1481 | } |
1482 | ||
1483 | /* | |
1484 | * Call the receive function. | |
1485 | * The sequence is held (has a refcnt) for us, | |
1486 | * but not for the receive function. | |
1487 | * | |
1488 | * The receive function may allocate a new sequence | |
1489 | * over the old one, so we shouldn't change the | |
1490 | * sequence after this. | |
1491 | * | |
1492 | * The frame will be freed by the receive function. | |
1493 | * If new exch resp handler is valid then call that | |
1494 | * first. | |
1495 | */ | |
1496 | if (resp) | |
1497 | resp(sp, fp, ex_resp_arg); | |
1498 | else | |
1499 | fc_frame_free(fp); | |
1500 | fc_exch_release(ep); | |
1501 | return; | |
1502 | rel: | |
1503 | fc_exch_release(ep); | |
1504 | out: | |
1505 | fc_frame_free(fp); | |
1506 | } | |
1507 | ||
3a3b42bf RL |
1508 | /** |
1509 | * fc_exch_recv_resp() - Handler for a sequence where other end is | |
1510 | * responding to our sequence | |
1511 | * @mp: The EM that the exchange is on | |
1512 | * @fp: The response frame | |
42e9a92f RL |
1513 | */ |
1514 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1515 | { | |
1516 | struct fc_seq *sp; | |
1517 | ||
1518 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1519 | |
1520 | if (!sp) | |
42e9a92f | 1521 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1522 | else |
42e9a92f | 1523 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1524 | |
42e9a92f RL |
1525 | fc_frame_free(fp); |
1526 | } | |
1527 | ||
3a3b42bf RL |
1528 | /** |
1529 | * fc_exch_abts_resp() - Handler for a response to an ABT | |
1530 | * @ep: The exchange that the frame is on | |
1531 | * @fp: The response frame | |
1532 | * | |
1533 | * This response would be to an ABTS cancelling an exchange or sequence. | |
1534 | * The response can be either BA_ACC or BA_RJT | |
42e9a92f RL |
1535 | */ |
1536 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1537 | { | |
1538 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1539 | void *ex_resp_arg; | |
1540 | struct fc_frame_header *fh; | |
1541 | struct fc_ba_acc *ap; | |
1542 | struct fc_seq *sp; | |
1543 | u16 low; | |
1544 | u16 high; | |
1545 | int rc = 1, has_rec = 0; | |
1546 | ||
1547 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1548 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1549 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1550 | |
1551 | if (cancel_delayed_work_sync(&ep->timeout_work)) | |
1552 | fc_exch_release(ep); /* release from pending timer hold */ | |
1553 | ||
1554 | spin_lock_bh(&ep->ex_lock); | |
1555 | switch (fh->fh_r_ctl) { | |
1556 | case FC_RCTL_BA_ACC: | |
1557 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1558 | if (!ap) | |
1559 | break; | |
1560 | ||
1561 | /* | |
1562 | * Decide whether to establish a Recovery Qualifier. | |
1563 | * We do this if there is a non-empty SEQ_CNT range and | |
1564 | * SEQ_ID is the same as the one we aborted. | |
1565 | */ | |
1566 | low = ntohs(ap->ba_low_seq_cnt); | |
1567 | high = ntohs(ap->ba_high_seq_cnt); | |
1568 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1569 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1570 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1571 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1572 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1573 | has_rec = 1; | |
1574 | } | |
1575 | break; | |
1576 | case FC_RCTL_BA_RJT: | |
1577 | break; | |
1578 | default: | |
1579 | break; | |
1580 | } | |
1581 | ||
1582 | resp = ep->resp; | |
1583 | ex_resp_arg = ep->arg; | |
1584 | ||
1585 | /* do we need to do some other checks here. Can we reuse more of | |
1586 | * fc_exch_recv_seq_resp | |
1587 | */ | |
1588 | sp = &ep->seq; | |
1589 | /* | |
1590 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1591 | */ | |
1592 | if (ep->fh_type != FC_TYPE_FCP && | |
1593 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1594 | rc = fc_exch_done_locked(ep); | |
1595 | spin_unlock_bh(&ep->ex_lock); | |
1596 | if (!rc) | |
b2f0091f | 1597 | fc_exch_delete(ep); |
42e9a92f RL |
1598 | |
1599 | if (resp) | |
1600 | resp(sp, fp, ex_resp_arg); | |
1601 | else | |
1602 | fc_frame_free(fp); | |
1603 | ||
1604 | if (has_rec) | |
1605 | fc_exch_timer_set(ep, ep->r_a_tov); | |
1606 | ||
1607 | } | |
1608 | ||
3a3b42bf RL |
1609 | /** |
1610 | * fc_exch_recv_bls() - Handler for a BLS sequence | |
1611 | * @mp: The EM that the exchange is on | |
1612 | * @fp: The request frame | |
1613 | * | |
1614 | * The BLS frame is always a sequence initiated by the remote side. | |
42e9a92f RL |
1615 | * We may be either the originator or recipient of the exchange. |
1616 | */ | |
1617 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1618 | { | |
1619 | struct fc_frame_header *fh; | |
1620 | struct fc_exch *ep; | |
1621 | u32 f_ctl; | |
1622 | ||
1623 | fh = fc_frame_header_get(fp); | |
1624 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1625 | fr_seq(fp) = NULL; | |
1626 | ||
1627 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1628 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1629 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1630 | spin_lock_bh(&ep->ex_lock); | |
1631 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1632 | spin_unlock_bh(&ep->ex_lock); | |
1633 | } | |
1634 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1635 | /* | |
1636 | * A response to a sequence we initiated. | |
1637 | * This should only be ACKs for class 2 or F. | |
1638 | */ | |
1639 | switch (fh->fh_r_ctl) { | |
1640 | case FC_RCTL_ACK_1: | |
1641 | case FC_RCTL_ACK_0: | |
1642 | break; | |
1643 | default: | |
7414705e RL |
1644 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received", |
1645 | fh->fh_r_ctl, | |
1646 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1647 | break; |
1648 | } | |
1649 | fc_frame_free(fp); | |
1650 | } else { | |
1651 | switch (fh->fh_r_ctl) { | |
1652 | case FC_RCTL_BA_RJT: | |
1653 | case FC_RCTL_BA_ACC: | |
1654 | if (ep) | |
1655 | fc_exch_abts_resp(ep, fp); | |
1656 | else | |
1657 | fc_frame_free(fp); | |
1658 | break; | |
1659 | case FC_RCTL_BA_ABTS: | |
1660 | fc_exch_recv_abts(ep, fp); | |
1661 | break; | |
1662 | default: /* ignore junk */ | |
1663 | fc_frame_free(fp); | |
1664 | break; | |
1665 | } | |
1666 | } | |
1667 | if (ep) | |
1668 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1669 | } | |
1670 | ||
3a3b42bf RL |
1671 | /** |
1672 | * fc_seq_ls_acc() - Accept sequence with LS_ACC | |
92261156 | 1673 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1674 | * |
42e9a92f RL |
1675 | * If this fails due to allocation or transmit congestion, assume the |
1676 | * originator will repeat the sequence. | |
1677 | */ | |
92261156 | 1678 | static void fc_seq_ls_acc(struct fc_frame *rx_fp) |
42e9a92f | 1679 | { |
92261156 | 1680 | struct fc_lport *lport; |
42e9a92f RL |
1681 | struct fc_els_ls_acc *acc; |
1682 | struct fc_frame *fp; | |
1683 | ||
92261156 JE |
1684 | lport = fr_dev(rx_fp); |
1685 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1686 | if (!fp) | |
1687 | return; | |
1688 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1689 | memset(acc, 0, sizeof(*acc)); | |
1690 | acc->la_cmd = ELS_LS_ACC; | |
1691 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1692 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1693 | } |
1694 | ||
3a3b42bf RL |
1695 | /** |
1696 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT | |
92261156 | 1697 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1698 | * @reason: The reason the sequence is being rejected |
92261156 | 1699 | * @explan: The explanation for the rejection |
3a3b42bf | 1700 | * |
42e9a92f RL |
1701 | * If this fails due to allocation or transmit congestion, assume the |
1702 | * originator will repeat the sequence. | |
1703 | */ | |
92261156 | 1704 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, |
42e9a92f RL |
1705 | enum fc_els_rjt_explan explan) |
1706 | { | |
92261156 | 1707 | struct fc_lport *lport; |
42e9a92f RL |
1708 | struct fc_els_ls_rjt *rjt; |
1709 | struct fc_frame *fp; | |
1710 | ||
92261156 JE |
1711 | lport = fr_dev(rx_fp); |
1712 | fp = fc_frame_alloc(lport, sizeof(*rjt)); | |
1713 | if (!fp) | |
1714 | return; | |
1715 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1716 | memset(rjt, 0, sizeof(*rjt)); | |
1717 | rjt->er_cmd = ELS_LS_RJT; | |
1718 | rjt->er_reason = reason; | |
1719 | rjt->er_explan = explan; | |
1720 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1721 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1722 | } |
1723 | ||
3a3b42bf RL |
1724 | /** |
1725 | * fc_exch_reset() - Reset an exchange | |
1726 | * @ep: The exchange to be reset | |
1727 | */ | |
42e9a92f RL |
1728 | static void fc_exch_reset(struct fc_exch *ep) |
1729 | { | |
1730 | struct fc_seq *sp; | |
1731 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
1732 | void *arg; | |
1733 | int rc = 1; | |
1734 | ||
1735 | spin_lock_bh(&ep->ex_lock); | |
77a2b73a | 1736 | fc_exch_abort_locked(ep, 0); |
42e9a92f | 1737 | ep->state |= FC_EX_RST_CLEANUP; |
42e9a92f RL |
1738 | if (cancel_delayed_work(&ep->timeout_work)) |
1739 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
1740 | resp = ep->resp; | |
1741 | ep->resp = NULL; | |
1742 | if (ep->esb_stat & ESB_ST_REC_QUAL) | |
1743 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1744 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1745 | arg = ep->arg; | |
1746 | sp = &ep->seq; | |
1747 | rc = fc_exch_done_locked(ep); | |
1748 | spin_unlock_bh(&ep->ex_lock); | |
1749 | if (!rc) | |
b2f0091f | 1750 | fc_exch_delete(ep); |
42e9a92f RL |
1751 | |
1752 | if (resp) | |
1753 | resp(sp, ERR_PTR(-FC_EX_CLOSED), arg); | |
1754 | } | |
1755 | ||
b2f0091f | 1756 | /** |
3a3b42bf RL |
1757 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
1758 | * @lport: The local port that the exchange pool is on | |
1759 | * @pool: The exchange pool to be reset | |
1760 | * @sid: The source ID | |
1761 | * @did: The destination ID | |
b2f0091f | 1762 | * |
3a3b42bf RL |
1763 | * Resets a per cpu exches pool, releasing all of its sequences |
1764 | * and exchanges. If sid is non-zero then reset only exchanges | |
1765 | * we sourced from the local port's FID. If did is non-zero then | |
1766 | * only reset exchanges destined for the local port's FID. | |
42e9a92f | 1767 | */ |
b2f0091f VD |
1768 | static void fc_exch_pool_reset(struct fc_lport *lport, |
1769 | struct fc_exch_pool *pool, | |
1770 | u32 sid, u32 did) | |
42e9a92f RL |
1771 | { |
1772 | struct fc_exch *ep; | |
1773 | struct fc_exch *next; | |
1774 | ||
b2f0091f | 1775 | spin_lock_bh(&pool->lock); |
42e9a92f | 1776 | restart: |
b2f0091f VD |
1777 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
1778 | if ((lport == ep->lp) && | |
1779 | (sid == 0 || sid == ep->sid) && | |
1780 | (did == 0 || did == ep->did)) { | |
1781 | fc_exch_hold(ep); | |
1782 | spin_unlock_bh(&pool->lock); | |
1783 | ||
1784 | fc_exch_reset(ep); | |
1785 | ||
1786 | fc_exch_release(ep); | |
1787 | spin_lock_bh(&pool->lock); | |
1788 | ||
1789 | /* | |
1790 | * must restart loop incase while lock | |
1791 | * was down multiple eps were released. | |
1792 | */ | |
1793 | goto restart; | |
42e9a92f | 1794 | } |
b2f0091f VD |
1795 | } |
1796 | spin_unlock_bh(&pool->lock); | |
1797 | } | |
1798 | ||
1799 | /** | |
3a3b42bf RL |
1800 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
1801 | * @lport: The local port whose EMs are to be reset | |
1802 | * @sid: The source ID | |
1803 | * @did: The destination ID | |
b2f0091f | 1804 | * |
3a3b42bf RL |
1805 | * Reset all EMs associated with a given local port. Release all |
1806 | * sequences and exchanges. If sid is non-zero then reset only the | |
1807 | * exchanges sent from the local port's FID. If did is non-zero then | |
1808 | * reset only exchanges destined for the local port's FID. | |
b2f0091f VD |
1809 | */ |
1810 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) | |
1811 | { | |
1812 | struct fc_exch_mgr_anchor *ema; | |
1813 | unsigned int cpu; | |
1814 | ||
1815 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
1816 | for_each_possible_cpu(cpu) | |
1817 | fc_exch_pool_reset(lport, | |
1818 | per_cpu_ptr(ema->mp->pool, cpu), | |
1819 | sid, did); | |
42e9a92f | 1820 | } |
42e9a92f RL |
1821 | } |
1822 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1823 | ||
92261156 JE |
1824 | /** |
1825 | * fc_exch_lookup() - find an exchange | |
1826 | * @lport: The local port | |
1827 | * @xid: The exchange ID | |
1828 | * | |
1829 | * Returns exchange pointer with hold for caller, or NULL if not found. | |
1830 | */ | |
1831 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) | |
1832 | { | |
1833 | struct fc_exch_mgr_anchor *ema; | |
1834 | ||
1835 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1836 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) | |
1837 | return fc_exch_find(ema->mp, xid); | |
1838 | return NULL; | |
1839 | } | |
1840 | ||
3a3b42bf RL |
1841 | /** |
1842 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests | |
92261156 | 1843 | * @rfp: The REC frame, not freed here. |
3a3b42bf | 1844 | * |
42e9a92f RL |
1845 | * Note that the requesting port may be different than the S_ID in the request. |
1846 | */ | |
92261156 | 1847 | static void fc_exch_els_rec(struct fc_frame *rfp) |
42e9a92f | 1848 | { |
92261156 | 1849 | struct fc_lport *lport; |
42e9a92f RL |
1850 | struct fc_frame *fp; |
1851 | struct fc_exch *ep; | |
42e9a92f RL |
1852 | struct fc_els_rec *rp; |
1853 | struct fc_els_rec_acc *acc; | |
1854 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1855 | enum fc_els_rjt_explan explan; | |
1856 | u32 sid; | |
1857 | u16 rxid; | |
1858 | u16 oxid; | |
1859 | ||
92261156 | 1860 | lport = fr_dev(rfp); |
42e9a92f RL |
1861 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); |
1862 | explan = ELS_EXPL_INV_LEN; | |
1863 | if (!rp) | |
1864 | goto reject; | |
1865 | sid = ntoh24(rp->rec_s_id); | |
1866 | rxid = ntohs(rp->rec_rx_id); | |
1867 | oxid = ntohs(rp->rec_ox_id); | |
1868 | ||
92261156 JE |
1869 | ep = fc_exch_lookup(lport, |
1870 | sid == fc_host_port_id(lport->host) ? oxid : rxid); | |
42e9a92f | 1871 | explan = ELS_EXPL_OXID_RXID; |
92261156 JE |
1872 | if (!ep) |
1873 | goto reject; | |
1874 | if (ep->oid != sid || oxid != ep->oxid) | |
1875 | goto rel; | |
1876 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) | |
1877 | goto rel; | |
1878 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1879 | if (!fp) | |
42e9a92f | 1880 | goto out; |
92261156 | 1881 | |
42e9a92f RL |
1882 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
1883 | memset(acc, 0, sizeof(*acc)); | |
1884 | acc->reca_cmd = ELS_LS_ACC; | |
1885 | acc->reca_ox_id = rp->rec_ox_id; | |
1886 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1887 | acc->reca_rx_id = htons(ep->rxid); | |
1888 | if (ep->sid == ep->oid) | |
1889 | hton24(acc->reca_rfid, ep->did); | |
1890 | else | |
1891 | hton24(acc->reca_rfid, ep->sid); | |
1892 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1893 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1894 | ESB_ST_SEQ_INIT | | |
1895 | ESB_ST_COMPLETE)); | |
92261156 JE |
1896 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); |
1897 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1898 | out: |
1899 | fc_exch_release(ep); | |
42e9a92f RL |
1900 | return; |
1901 | ||
1902 | rel: | |
1903 | fc_exch_release(ep); | |
1904 | reject: | |
92261156 | 1905 | fc_seq_ls_rjt(rfp, reason, explan); |
42e9a92f RL |
1906 | } |
1907 | ||
3a3b42bf RL |
1908 | /** |
1909 | * fc_exch_rrq_resp() - Handler for RRQ responses | |
1910 | * @sp: The sequence that the RRQ is on | |
1911 | * @fp: The RRQ frame | |
1912 | * @arg: The exchange that the RRQ is on | |
42e9a92f RL |
1913 | * |
1914 | * TODO: fix error handler. | |
1915 | */ | |
1916 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
1917 | { | |
1918 | struct fc_exch *aborted_ep = arg; | |
1919 | unsigned int op; | |
1920 | ||
1921 | if (IS_ERR(fp)) { | |
1922 | int err = PTR_ERR(fp); | |
1923 | ||
78342da3 | 1924 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 1925 | goto cleanup; |
7414705e RL |
1926 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
1927 | "frame error %d\n", err); | |
42e9a92f RL |
1928 | return; |
1929 | } | |
1930 | ||
1931 | op = fc_frame_payload_op(fp); | |
1932 | fc_frame_free(fp); | |
1933 | ||
1934 | switch (op) { | |
1935 | case ELS_LS_RJT: | |
7414705e | 1936 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ"); |
42e9a92f RL |
1937 | /* fall through */ |
1938 | case ELS_LS_ACC: | |
1939 | goto cleanup; | |
1940 | default: | |
7414705e RL |
1941 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x " |
1942 | "for RRQ", op); | |
42e9a92f RL |
1943 | return; |
1944 | } | |
1945 | ||
1946 | cleanup: | |
1947 | fc_exch_done(&aborted_ep->seq); | |
1948 | /* drop hold for rec qual */ | |
1949 | fc_exch_release(aborted_ep); | |
1950 | } | |
1951 | ||
1a7b75ae RL |
1952 | |
1953 | /** | |
3a3b42bf RL |
1954 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
1955 | * @lport: The local port to send the frame on | |
1956 | * @fp: The frame to be sent | |
1957 | * @resp: The response handler for this request | |
1958 | * @destructor: The destructor for the exchange | |
1959 | * @arg: The argument to be passed to the response handler | |
1960 | * @timer_msec: The timeout period for the exchange | |
1961 | * | |
1962 | * The frame pointer with some of the header's fields must be | |
1963 | * filled before calling this routine, those fields are: | |
1964 | * | |
1965 | * - routing control | |
1966 | * - FC port did | |
1967 | * - FC port sid | |
1968 | * - FC header type | |
1969 | * - frame control | |
1970 | * - parameter or relative offset | |
1a7b75ae | 1971 | */ |
3a3b42bf | 1972 | static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
1a7b75ae RL |
1973 | struct fc_frame *fp, |
1974 | void (*resp)(struct fc_seq *, | |
1975 | struct fc_frame *fp, | |
1976 | void *arg), | |
1977 | void (*destructor)(struct fc_seq *, | |
1978 | void *), | |
1979 | void *arg, u32 timer_msec) | |
1980 | { | |
1981 | struct fc_exch *ep; | |
1982 | struct fc_seq *sp = NULL; | |
1983 | struct fc_frame_header *fh; | |
3ee17f59 | 1984 | struct fc_fcp_pkt *fsp = NULL; |
1a7b75ae RL |
1985 | int rc = 1; |
1986 | ||
3a3b42bf | 1987 | ep = fc_exch_alloc(lport, fp); |
1a7b75ae RL |
1988 | if (!ep) { |
1989 | fc_frame_free(fp); | |
1990 | return NULL; | |
1991 | } | |
1992 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1993 | fh = fc_frame_header_get(fp); | |
1994 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
1995 | ep->resp = resp; | |
1996 | ep->destructor = destructor; | |
1997 | ep->arg = arg; | |
1998 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
3a3b42bf | 1999 | ep->lp = lport; |
1a7b75ae RL |
2000 | sp = &ep->seq; |
2001 | ||
2002 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
2003 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
2004 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
2005 | sp->cnt++; | |
2006 | ||
3ee17f59 YZ |
2007 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) { |
2008 | fsp = fr_fsp(fp); | |
1a7b75ae | 2009 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
3ee17f59 | 2010 | } |
1a7b75ae | 2011 | |
3a3b42bf | 2012 | if (unlikely(lport->tt.frame_send(lport, fp))) |
1a7b75ae RL |
2013 | goto err; |
2014 | ||
2015 | if (timer_msec) | |
2016 | fc_exch_timer_set_locked(ep, timer_msec); | |
2017 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
2018 | ||
2019 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
2020 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
2021 | spin_unlock_bh(&ep->ex_lock); | |
2022 | return sp; | |
2023 | err: | |
3ee17f59 YZ |
2024 | if (fsp) |
2025 | fc_fcp_ddp_done(fsp); | |
1a7b75ae RL |
2026 | rc = fc_exch_done_locked(ep); |
2027 | spin_unlock_bh(&ep->ex_lock); | |
2028 | if (!rc) | |
2029 | fc_exch_delete(ep); | |
2030 | return NULL; | |
2031 | } | |
2032 | ||
3a3b42bf RL |
2033 | /** |
2034 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command | |
2035 | * @ep: The exchange to send the RRQ on | |
2036 | * | |
42e9a92f RL |
2037 | * This tells the remote port to stop blocking the use of |
2038 | * the exchange and the seq_cnt range. | |
2039 | */ | |
2040 | static void fc_exch_rrq(struct fc_exch *ep) | |
2041 | { | |
3a3b42bf | 2042 | struct fc_lport *lport; |
42e9a92f RL |
2043 | struct fc_els_rrq *rrq; |
2044 | struct fc_frame *fp; | |
42e9a92f RL |
2045 | u32 did; |
2046 | ||
3a3b42bf | 2047 | lport = ep->lp; |
42e9a92f | 2048 | |
3a3b42bf | 2049 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
42e9a92f | 2050 | if (!fp) |
a0cc1ecc VD |
2051 | goto retry; |
2052 | ||
42e9a92f RL |
2053 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
2054 | memset(rrq, 0, sizeof(*rrq)); | |
2055 | rrq->rrq_cmd = ELS_RRQ; | |
2056 | hton24(rrq->rrq_s_id, ep->sid); | |
2057 | rrq->rrq_ox_id = htons(ep->oxid); | |
2058 | rrq->rrq_rx_id = htons(ep->rxid); | |
2059 | ||
2060 | did = ep->did; | |
2061 | if (ep->esb_stat & ESB_ST_RESP) | |
2062 | did = ep->sid; | |
2063 | ||
2064 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
7b2787ec | 2065 | lport->port_id, FC_TYPE_ELS, |
42e9a92f RL |
2066 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
2067 | ||
3a3b42bf RL |
2068 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
2069 | lport->e_d_tov)) | |
a0cc1ecc VD |
2070 | return; |
2071 | ||
2072 | retry: | |
2073 | spin_lock_bh(&ep->ex_lock); | |
2074 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
2075 | spin_unlock_bh(&ep->ex_lock); | |
2076 | /* drop hold for rec qual */ | |
2077 | fc_exch_release(ep); | |
42e9a92f RL |
2078 | return; |
2079 | } | |
a0cc1ecc VD |
2080 | ep->esb_stat |= ESB_ST_REC_QUAL; |
2081 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
2082 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
2083 | } |
2084 | ||
3a3b42bf RL |
2085 | /** |
2086 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests | |
92261156 | 2087 | * @fp: The RRQ frame, not freed here. |
42e9a92f | 2088 | */ |
92261156 | 2089 | static void fc_exch_els_rrq(struct fc_frame *fp) |
42e9a92f | 2090 | { |
92261156 | 2091 | struct fc_lport *lport; |
3f127ad9 | 2092 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
42e9a92f RL |
2093 | struct fc_els_rrq *rp; |
2094 | u32 sid; | |
2095 | u16 xid; | |
2096 | enum fc_els_rjt_explan explan; | |
2097 | ||
92261156 | 2098 | lport = fr_dev(fp); |
42e9a92f RL |
2099 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
2100 | explan = ELS_EXPL_INV_LEN; | |
2101 | if (!rp) | |
2102 | goto reject; | |
2103 | ||
2104 | /* | |
2105 | * lookup subject exchange. | |
2106 | */ | |
42e9a92f | 2107 | sid = ntoh24(rp->rrq_s_id); /* subject source */ |
92261156 JE |
2108 | xid = fc_host_port_id(lport->host) == sid ? |
2109 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
2110 | ep = fc_exch_lookup(lport, xid); | |
42e9a92f RL |
2111 | explan = ELS_EXPL_OXID_RXID; |
2112 | if (!ep) | |
2113 | goto reject; | |
2114 | spin_lock_bh(&ep->ex_lock); | |
2115 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
2116 | goto unlock_reject; | |
2117 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
2118 | ep->rxid != FC_XID_UNKNOWN) | |
2119 | goto unlock_reject; | |
2120 | explan = ELS_EXPL_SID; | |
2121 | if (ep->sid != sid) | |
2122 | goto unlock_reject; | |
2123 | ||
2124 | /* | |
2125 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
2126 | */ | |
2127 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
2128 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
2129 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
2130 | } | |
2131 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
2132 | if (cancel_delayed_work(&ep->timeout_work)) | |
2133 | atomic_dec(&ep->ex_refcnt); /* drop timer hold */ | |
2134 | } | |
2135 | ||
2136 | spin_unlock_bh(&ep->ex_lock); | |
2137 | ||
2138 | /* | |
2139 | * Send LS_ACC. | |
2140 | */ | |
92261156 | 2141 | fc_seq_ls_acc(fp); |
3f127ad9 | 2142 | goto out; |
42e9a92f RL |
2143 | |
2144 | unlock_reject: | |
2145 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f | 2146 | reject: |
92261156 | 2147 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); |
3f127ad9 | 2148 | out: |
3f127ad9 VD |
2149 | if (ep) |
2150 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
42e9a92f RL |
2151 | } |
2152 | ||
3a3b42bf RL |
2153 | /** |
2154 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs | |
2155 | * @lport: The local port to add the exchange manager to | |
2156 | * @mp: The exchange manager to be added to the local port | |
2157 | * @match: The match routine that indicates when this EM should be used | |
2158 | */ | |
96316099 VD |
2159 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
2160 | struct fc_exch_mgr *mp, | |
2161 | bool (*match)(struct fc_frame *)) | |
2162 | { | |
2163 | struct fc_exch_mgr_anchor *ema; | |
2164 | ||
2165 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
2166 | if (!ema) | |
2167 | return ema; | |
2168 | ||
2169 | ema->mp = mp; | |
2170 | ema->match = match; | |
2171 | /* add EM anchor to EM anchors list */ | |
2172 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
2173 | kref_get(&mp->kref); | |
2174 | return ema; | |
2175 | } | |
2176 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
2177 | ||
3a3b42bf RL |
2178 | /** |
2179 | * fc_exch_mgr_destroy() - Destroy an exchange manager | |
2180 | * @kref: The reference to the EM to be destroyed | |
2181 | */ | |
96316099 VD |
2182 | static void fc_exch_mgr_destroy(struct kref *kref) |
2183 | { | |
2184 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
2185 | ||
96316099 | 2186 | mempool_destroy(mp->ep_pool); |
e4bc50be | 2187 | free_percpu(mp->pool); |
96316099 VD |
2188 | kfree(mp); |
2189 | } | |
2190 | ||
3a3b42bf RL |
2191 | /** |
2192 | * fc_exch_mgr_del() - Delete an EM from a local port's list | |
2193 | * @ema: The exchange manager anchor identifying the EM to be deleted | |
2194 | */ | |
96316099 VD |
2195 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
2196 | { | |
2197 | /* remove EM anchor from EM anchors list */ | |
2198 | list_del(&ema->ema_list); | |
2199 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
2200 | kfree(ema); | |
2201 | } | |
2202 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
2203 | ||
174e1ebf | 2204 | /** |
3a3b42bf RL |
2205 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
2206 | * @src: Source lport to clone exchange managers from | |
2207 | * @dst: New lport that takes references to all the exchange managers | |
174e1ebf CL |
2208 | */ |
2209 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) | |
2210 | { | |
2211 | struct fc_exch_mgr_anchor *ema, *tmp; | |
2212 | ||
2213 | list_for_each_entry(ema, &src->ema_list, ema_list) { | |
2214 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) | |
2215 | goto err; | |
2216 | } | |
2217 | return 0; | |
2218 | err: | |
2219 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) | |
2220 | fc_exch_mgr_del(ema); | |
2221 | return -ENOMEM; | |
2222 | } | |
72fa396b | 2223 | EXPORT_SYMBOL(fc_exch_mgr_list_clone); |
174e1ebf | 2224 | |
3a3b42bf RL |
2225 | /** |
2226 | * fc_exch_mgr_alloc() - Allocate an exchange manager | |
2227 | * @lport: The local port that the new EM will be associated with | |
2228 | * @class: The default FC class for new exchanges | |
2229 | * @min_xid: The minimum XID for exchanges from the new EM | |
2230 | * @max_xid: The maximum XID for exchanges from the new EM | |
2231 | * @match: The match routine for the new EM | |
2232 | */ | |
2233 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, | |
42e9a92f | 2234 | enum fc_class class, |
52ff878c VD |
2235 | u16 min_xid, u16 max_xid, |
2236 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
2237 | { |
2238 | struct fc_exch_mgr *mp; | |
e4bc50be VD |
2239 | u16 pool_exch_range; |
2240 | size_t pool_size; | |
2241 | unsigned int cpu; | |
2242 | struct fc_exch_pool *pool; | |
42e9a92f | 2243 | |
e4bc50be VD |
2244 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
2245 | (min_xid & fc_cpu_mask) != 0) { | |
3a3b42bf | 2246 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
7414705e | 2247 | min_xid, max_xid); |
42e9a92f RL |
2248 | return NULL; |
2249 | } | |
2250 | ||
2251 | /* | |
b2f0091f | 2252 | * allocate memory for EM |
42e9a92f | 2253 | */ |
b2f0091f | 2254 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
42e9a92f RL |
2255 | if (!mp) |
2256 | return NULL; | |
2257 | ||
2258 | mp->class = class; | |
42e9a92f RL |
2259 | /* adjust em exch xid range for offload */ |
2260 | mp->min_xid = min_xid; | |
2261 | mp->max_xid = max_xid; | |
42e9a92f RL |
2262 | |
2263 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
2264 | if (!mp->ep_pool) | |
2265 | goto free_mp; | |
2266 | ||
e4bc50be VD |
2267 | /* |
2268 | * Setup per cpu exch pool with entire exchange id range equally | |
2269 | * divided across all cpus. The exch pointers array memory is | |
2270 | * allocated for exch range per pool. | |
2271 | */ | |
2272 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / (fc_cpu_mask + 1); | |
2273 | mp->pool_max_index = pool_exch_range - 1; | |
2274 | ||
2275 | /* | |
2276 | * Allocate and initialize per cpu exch pool | |
2277 | */ | |
2278 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
2279 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
2280 | if (!mp->pool) | |
2281 | goto free_mempool; | |
2282 | for_each_possible_cpu(cpu) { | |
2283 | pool = per_cpu_ptr(mp->pool, cpu); | |
2034c19c HD |
2284 | pool->left = FC_XID_UNKNOWN; |
2285 | pool->right = FC_XID_UNKNOWN; | |
e4bc50be VD |
2286 | spin_lock_init(&pool->lock); |
2287 | INIT_LIST_HEAD(&pool->ex_list); | |
2288 | } | |
2289 | ||
52ff878c | 2290 | kref_init(&mp->kref); |
3a3b42bf | 2291 | if (!fc_exch_mgr_add(lport, mp, match)) { |
e4bc50be VD |
2292 | free_percpu(mp->pool); |
2293 | goto free_mempool; | |
52ff878c VD |
2294 | } |
2295 | ||
2296 | /* | |
2297 | * Above kref_init() sets mp->kref to 1 and then | |
2298 | * call to fc_exch_mgr_add incremented mp->kref again, | |
2299 | * so adjust that extra increment. | |
2300 | */ | |
2301 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
2302 | return mp; |
2303 | ||
e4bc50be VD |
2304 | free_mempool: |
2305 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
2306 | free_mp: |
2307 | kfree(mp); | |
2308 | return NULL; | |
2309 | } | |
2310 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
2311 | ||
3a3b42bf RL |
2312 | /** |
2313 | * fc_exch_mgr_free() - Free all exchange managers on a local port | |
2314 | * @lport: The local port whose EMs are to be freed | |
2315 | */ | |
52ff878c | 2316 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 2317 | { |
52ff878c VD |
2318 | struct fc_exch_mgr_anchor *ema, *next; |
2319 | ||
4ae1e19f | 2320 | flush_workqueue(fc_exch_workqueue); |
52ff878c VD |
2321 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
2322 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
2323 | } |
2324 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
2325 | ||
6c8cc1c0 KP |
2326 | /** |
2327 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending | |
2328 | * upon 'xid'. | |
2329 | * @f_ctl: f_ctl | |
2330 | * @lport: The local port the frame was received on | |
2331 | * @fh: The received frame header | |
2332 | */ | |
2333 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, | |
2334 | struct fc_lport *lport, | |
2335 | struct fc_frame_header *fh) | |
2336 | { | |
2337 | struct fc_exch_mgr_anchor *ema; | |
2338 | u16 xid; | |
2339 | ||
2340 | if (f_ctl & FC_FC_EX_CTX) | |
2341 | xid = ntohs(fh->fh_ox_id); | |
2342 | else { | |
2343 | xid = ntohs(fh->fh_rx_id); | |
2344 | if (xid == FC_XID_UNKNOWN) | |
2345 | return list_entry(lport->ema_list.prev, | |
2346 | typeof(*ema), ema_list); | |
2347 | } | |
2348 | ||
2349 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2350 | if ((xid >= ema->mp->min_xid) && | |
2351 | (xid <= ema->mp->max_xid)) | |
2352 | return ema; | |
2353 | } | |
2354 | return NULL; | |
2355 | } | |
3a3b42bf RL |
2356 | /** |
2357 | * fc_exch_recv() - Handler for received frames | |
2358 | * @lport: The local port the frame was received on | |
6c8cc1c0 | 2359 | * @fp: The received frame |
42e9a92f | 2360 | */ |
3a3b42bf | 2361 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
2362 | { |
2363 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c | 2364 | struct fc_exch_mgr_anchor *ema; |
6c8cc1c0 | 2365 | u32 f_ctl; |
42e9a92f RL |
2366 | |
2367 | /* lport lock ? */ | |
3a3b42bf RL |
2368 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
2369 | FC_LPORT_DBG(lport, "Receiving frames for an lport that " | |
7414705e | 2370 | "has not been initialized correctly\n"); |
42e9a92f RL |
2371 | fc_frame_free(fp); |
2372 | return; | |
2373 | } | |
2374 | ||
52ff878c | 2375 | f_ctl = ntoh24(fh->fh_f_ctl); |
6c8cc1c0 KP |
2376 | ema = fc_find_ema(f_ctl, lport, fh); |
2377 | if (!ema) { | |
2378 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," | |
2379 | "fc_ctl <0x%x>, xid <0x%x>\n", | |
2380 | f_ctl, | |
2381 | (f_ctl & FC_FC_EX_CTX) ? | |
2382 | ntohs(fh->fh_ox_id) : | |
2383 | ntohs(fh->fh_rx_id)); | |
2384 | fc_frame_free(fp); | |
2385 | return; | |
2386 | } | |
52ff878c | 2387 | |
42e9a92f RL |
2388 | /* |
2389 | * If frame is marked invalid, just drop it. | |
2390 | */ | |
42e9a92f RL |
2391 | switch (fr_eof(fp)) { |
2392 | case FC_EOF_T: | |
2393 | if (f_ctl & FC_FC_END_SEQ) | |
2394 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
2395 | /* fall through */ | |
2396 | case FC_EOF_N: | |
2397 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2398 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2399 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2400 | FC_FC_EX_CTX) | |
52ff878c | 2401 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2402 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2403 | fc_exch_recv_resp(ema->mp, fp); |
92261156 | 2404 | else /* no EX_CTX and no SEQ_CTX */ |
3a3b42bf | 2405 | fc_exch_recv_req(lport, ema->mp, fp); |
42e9a92f RL |
2406 | break; |
2407 | default: | |
3a3b42bf RL |
2408 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
2409 | fr_eof(fp)); | |
42e9a92f | 2410 | fc_frame_free(fp); |
42e9a92f RL |
2411 | } |
2412 | } | |
2413 | EXPORT_SYMBOL(fc_exch_recv); | |
2414 | ||
3a3b42bf RL |
2415 | /** |
2416 | * fc_exch_init() - Initialize the exchange layer for a local port | |
2417 | * @lport: The local port to initialize the exchange layer for | |
2418 | */ | |
2419 | int fc_exch_init(struct fc_lport *lport) | |
42e9a92f | 2420 | { |
3a3b42bf RL |
2421 | if (!lport->tt.seq_start_next) |
2422 | lport->tt.seq_start_next = fc_seq_start_next; | |
42e9a92f | 2423 | |
1a5c2d7e JE |
2424 | if (!lport->tt.seq_set_resp) |
2425 | lport->tt.seq_set_resp = fc_seq_set_resp; | |
2426 | ||
3a3b42bf RL |
2427 | if (!lport->tt.exch_seq_send) |
2428 | lport->tt.exch_seq_send = fc_exch_seq_send; | |
42e9a92f | 2429 | |
3a3b42bf RL |
2430 | if (!lport->tt.seq_send) |
2431 | lport->tt.seq_send = fc_seq_send; | |
42e9a92f | 2432 | |
3a3b42bf RL |
2433 | if (!lport->tt.seq_els_rsp_send) |
2434 | lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
42e9a92f | 2435 | |
3a3b42bf RL |
2436 | if (!lport->tt.exch_done) |
2437 | lport->tt.exch_done = fc_exch_done; | |
42e9a92f | 2438 | |
3a3b42bf RL |
2439 | if (!lport->tt.exch_mgr_reset) |
2440 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
42e9a92f | 2441 | |
3a3b42bf RL |
2442 | if (!lport->tt.seq_exch_abort) |
2443 | lport->tt.seq_exch_abort = fc_seq_exch_abort; | |
42e9a92f | 2444 | |
239e8104 JE |
2445 | if (!lport->tt.seq_assign) |
2446 | lport->tt.seq_assign = fc_seq_assign; | |
2447 | ||
62bdb645 JE |
2448 | if (!lport->tt.seq_release) |
2449 | lport->tt.seq_release = fc_seq_release; | |
2450 | ||
89f19a59 VD |
2451 | return 0; |
2452 | } | |
2453 | EXPORT_SYMBOL(fc_exch_init); | |
2454 | ||
2455 | /** | |
2456 | * fc_setup_exch_mgr() - Setup an exchange manager | |
2457 | */ | |
55204909 | 2458 | int fc_setup_exch_mgr(void) |
89f19a59 VD |
2459 | { |
2460 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2461 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2462 | if (!fc_em_cachep) | |
2463 | return -ENOMEM; | |
2464 | ||
e4bc50be VD |
2465 | /* |
2466 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2467 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2468 | * to order of 2's * power and order is stored | |
2469 | * in fc_cpu_order as this is later required in | |
2470 | * mapping between an exch id and exch array index | |
2471 | * in per cpu exch pool. | |
2472 | * | |
2473 | * This round up is required to align fc_cpu_mask | |
2474 | * to exchange id's lower bits such that all incoming | |
2475 | * frames of an exchange gets delivered to the same | |
2476 | * cpu on which exchange originated by simple bitwise | |
2477 | * AND operation between fc_cpu_mask and exchange id. | |
2478 | */ | |
2479 | fc_cpu_mask = 1; | |
2480 | fc_cpu_order = 0; | |
2481 | while (fc_cpu_mask < nr_cpu_ids) { | |
2482 | fc_cpu_mask <<= 1; | |
2483 | fc_cpu_order++; | |
2484 | } | |
2485 | fc_cpu_mask--; | |
2486 | ||
4ae1e19f VD |
2487 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
2488 | if (!fc_exch_workqueue) | |
6f06e3a7 | 2489 | goto err; |
42e9a92f | 2490 | return 0; |
6f06e3a7 HD |
2491 | err: |
2492 | kmem_cache_destroy(fc_em_cachep); | |
2493 | return -ENOMEM; | |
42e9a92f | 2494 | } |
42e9a92f | 2495 | |
3a3b42bf RL |
2496 | /** |
2497 | * fc_destroy_exch_mgr() - Destroy an exchange manager | |
2498 | */ | |
55204909 | 2499 | void fc_destroy_exch_mgr(void) |
42e9a92f | 2500 | { |
4ae1e19f | 2501 | destroy_workqueue(fc_exch_workqueue); |
42e9a92f RL |
2502 | kmem_cache_destroy(fc_em_cachep); |
2503 | } |