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42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | |
3 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. | |
4 | * Copyright(c) 2008 Mike Christie | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | * | |
19 | * Maintained at www.Open-FCoE.org | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Fibre Channel exchange and sequence handling. | |
24 | */ | |
25 | ||
26 | #include <linux/timer.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
42e9a92f | 28 | #include <linux/err.h> |
09703660 | 29 | #include <linux/export.h> |
42e9a92f RL |
30 | |
31 | #include <scsi/fc/fc_fc2.h> | |
32 | ||
33 | #include <scsi/libfc.h> | |
34 | #include <scsi/fc_encode.h> | |
35 | ||
8866a5d9 RL |
36 | #include "fc_libfc.h" |
37 | ||
e4bc50be VD |
38 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
39 | EXPORT_SYMBOL(fc_cpu_mask); | |
40 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ | |
3a3b42bf | 41 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
55204909 | 42 | static struct workqueue_struct *fc_exch_workqueue; |
42e9a92f RL |
43 | |
44 | /* | |
45 | * Structure and function definitions for managing Fibre Channel Exchanges | |
46 | * and Sequences. | |
47 | * | |
48 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
49 | * | |
50 | * fc_exch_mgr holds the exchange state for an N port | |
51 | * | |
52 | * fc_exch holds state for one exchange and links to its active sequence. | |
53 | * | |
54 | * fc_seq holds the state for an individual sequence. | |
55 | */ | |
56 | ||
3a3b42bf RL |
57 | /** |
58 | * struct fc_exch_pool - Per cpu exchange pool | |
59 | * @next_index: Next possible free exchange index | |
60 | * @total_exches: Total allocated exchanges | |
61 | * @lock: Exch pool lock | |
62 | * @ex_list: List of exchanges | |
e4bc50be VD |
63 | * |
64 | * This structure manages per cpu exchanges in array of exchange pointers. | |
65 | * This array is allocated followed by struct fc_exch_pool memory for | |
66 | * assigned range of exchanges to per cpu pool. | |
67 | */ | |
68 | struct fc_exch_pool { | |
e17b4af7 VD |
69 | spinlock_t lock; |
70 | struct list_head ex_list; | |
3a3b42bf RL |
71 | u16 next_index; |
72 | u16 total_exches; | |
2034c19c HD |
73 | |
74 | /* two cache of free slot in exch array */ | |
75 | u16 left; | |
76 | u16 right; | |
e17b4af7 | 77 | } ____cacheline_aligned_in_smp; |
e4bc50be | 78 | |
3a3b42bf RL |
79 | /** |
80 | * struct fc_exch_mgr - The Exchange Manager (EM). | |
81 | * @class: Default class for new sequences | |
82 | * @kref: Reference counter | |
83 | * @min_xid: Minimum exchange ID | |
84 | * @max_xid: Maximum exchange ID | |
85 | * @ep_pool: Reserved exchange pointers | |
86 | * @pool_max_index: Max exch array index in exch pool | |
87 | * @pool: Per cpu exch pool | |
88 | * @stats: Statistics structure | |
42e9a92f RL |
89 | * |
90 | * This structure is the center for creating exchanges and sequences. | |
91 | * It manages the allocation of exchange IDs. | |
92 | */ | |
93 | struct fc_exch_mgr { | |
c6b21c93 | 94 | struct fc_exch_pool __percpu *pool; |
e17b4af7 | 95 | mempool_t *ep_pool; |
3a3b42bf RL |
96 | enum fc_class class; |
97 | struct kref kref; | |
98 | u16 min_xid; | |
99 | u16 max_xid; | |
3a3b42bf | 100 | u16 pool_max_index; |
42e9a92f | 101 | |
42e9a92f RL |
102 | struct { |
103 | atomic_t no_free_exch; | |
104 | atomic_t no_free_exch_xid; | |
105 | atomic_t xid_not_found; | |
106 | atomic_t xid_busy; | |
107 | atomic_t seq_not_found; | |
108 | atomic_t non_bls_resp; | |
109 | } stats; | |
42e9a92f | 110 | }; |
42e9a92f | 111 | |
3a3b42bf RL |
112 | /** |
113 | * struct fc_exch_mgr_anchor - primary structure for list of EMs | |
114 | * @ema_list: Exchange Manager Anchor list | |
115 | * @mp: Exchange Manager associated with this anchor | |
116 | * @match: Routine to determine if this anchor's EM should be used | |
117 | * | |
118 | * When walking the list of anchors the match routine will be called | |
119 | * for each anchor to determine if that EM should be used. The last | |
120 | * anchor in the list will always match to handle any exchanges not | |
121 | * handled by other EMs. The non-default EMs would be added to the | |
1bd49b48 | 122 | * anchor list by HW that provides offloads. |
3a3b42bf | 123 | */ |
96316099 VD |
124 | struct fc_exch_mgr_anchor { |
125 | struct list_head ema_list; | |
126 | struct fc_exch_mgr *mp; | |
127 | bool (*match)(struct fc_frame *); | |
128 | }; | |
129 | ||
42e9a92f | 130 | static void fc_exch_rrq(struct fc_exch *); |
92261156 JE |
131 | static void fc_seq_ls_acc(struct fc_frame *); |
132 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, | |
42e9a92f | 133 | enum fc_els_rjt_explan); |
92261156 JE |
134 | static void fc_exch_els_rec(struct fc_frame *); |
135 | static void fc_exch_els_rrq(struct fc_frame *); | |
42e9a92f RL |
136 | |
137 | /* | |
138 | * Internal implementation notes. | |
139 | * | |
140 | * The exchange manager is one by default in libfc but LLD may choose | |
141 | * to have one per CPU. The sequence manager is one per exchange manager | |
142 | * and currently never separated. | |
143 | * | |
144 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
145 | * assigned by the Sequence Initiator that shall be unique for a specific | |
146 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
147 | * qualified by exchange ID, which one might think it would be. | |
148 | * In practice this limits the number of open sequences and exchanges to 256 | |
149 | * per session. For most targets we could treat this limit as per exchange. | |
150 | * | |
151 | * The exchange and its sequence are freed when the last sequence is received. | |
152 | * It's possible for the remote port to leave an exchange open without | |
153 | * sending any sequences. | |
154 | * | |
155 | * Notes on reference counts: | |
156 | * | |
157 | * Exchanges are reference counted and exchange gets freed when the reference | |
158 | * count becomes zero. | |
159 | * | |
160 | * Timeouts: | |
161 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
162 | * | |
163 | * Sequence event handling: | |
164 | * | |
165 | * The following events may occur on initiator sequences: | |
166 | * | |
167 | * Send. | |
168 | * For now, the whole thing is sent. | |
169 | * Receive ACK | |
170 | * This applies only to class F. | |
171 | * The sequence is marked complete. | |
172 | * ULP completion. | |
173 | * The upper layer calls fc_exch_done() when done | |
174 | * with exchange and sequence tuple. | |
175 | * RX-inferred completion. | |
176 | * When we receive the next sequence on the same exchange, we can | |
177 | * retire the previous sequence ID. (XXX not implemented). | |
178 | * Timeout. | |
179 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
180 | * E_D_TOV causes abort and calls upper layer response handler | |
181 | * with FC_EX_TIMEOUT error. | |
182 | * Receive RJT | |
183 | * XXX defer. | |
184 | * Send ABTS | |
185 | * On timeout. | |
186 | * | |
187 | * The following events may occur on recipient sequences: | |
188 | * | |
189 | * Receive | |
190 | * Allocate sequence for first frame received. | |
191 | * Hold during receive handler. | |
192 | * Release when final frame received. | |
193 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
194 | * Receive ABTS | |
195 | * Deallocate sequence | |
196 | * Send RJT | |
197 | * Deallocate | |
198 | * | |
199 | * For now, we neglect conditions where only part of a sequence was | |
200 | * received or transmitted, or where out-of-order receipt is detected. | |
201 | */ | |
202 | ||
203 | /* | |
204 | * Locking notes: | |
205 | * | |
206 | * The EM code run in a per-CPU worker thread. | |
207 | * | |
208 | * To protect against concurrency between a worker thread code and timers, | |
209 | * sequence allocation and deallocation must be locked. | |
210 | * - exchange refcnt can be done atomicly without locks. | |
211 | * - sequence allocation must be locked by exch lock. | |
b2f0091f VD |
212 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
213 | * EM pool lock must be taken before the ex_lock. | |
42e9a92f RL |
214 | */ |
215 | ||
216 | /* | |
217 | * opcode names for debugging. | |
218 | */ | |
219 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
220 | ||
3a3b42bf RL |
221 | /** |
222 | * fc_exch_name_lookup() - Lookup name by opcode | |
223 | * @op: Opcode to be looked up | |
224 | * @table: Opcode/name table | |
225 | * @max_index: Index not to be exceeded | |
226 | * | |
227 | * This routine is used to determine a human-readable string identifying | |
228 | * a R_CTL opcode. | |
229 | */ | |
42e9a92f RL |
230 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
231 | unsigned int max_index) | |
232 | { | |
233 | const char *name = NULL; | |
234 | ||
235 | if (op < max_index) | |
236 | name = table[op]; | |
237 | if (!name) | |
238 | name = "unknown"; | |
239 | return name; | |
240 | } | |
241 | ||
3a3b42bf RL |
242 | /** |
243 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() | |
244 | * @op: The opcode to be looked up | |
245 | */ | |
42e9a92f RL |
246 | static const char *fc_exch_rctl_name(unsigned int op) |
247 | { | |
248 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
7156fffa | 249 | ARRAY_SIZE(fc_exch_rctl_names)); |
42e9a92f RL |
250 | } |
251 | ||
3a3b42bf RL |
252 | /** |
253 | * fc_exch_hold() - Increment an exchange's reference count | |
254 | * @ep: Echange to be held | |
42e9a92f | 255 | */ |
3a3b42bf | 256 | static inline void fc_exch_hold(struct fc_exch *ep) |
42e9a92f RL |
257 | { |
258 | atomic_inc(&ep->ex_refcnt); | |
259 | } | |
260 | ||
3a3b42bf RL |
261 | /** |
262 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields | |
263 | * and determine SOF and EOF. | |
264 | * @ep: The exchange to that will use the header | |
265 | * @fp: The frame whose header is to be modified | |
266 | * @f_ctl: F_CTL bits that will be used for the frame header | |
267 | * | |
268 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, | |
269 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. | |
42e9a92f RL |
270 | */ |
271 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
272 | u32 f_ctl) | |
273 | { | |
274 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
275 | u16 fill; | |
276 | ||
277 | fr_sof(fp) = ep->class; | |
278 | if (ep->seq.cnt) | |
279 | fr_sof(fp) = fc_sof_normal(ep->class); | |
280 | ||
281 | if (f_ctl & FC_FC_END_SEQ) { | |
282 | fr_eof(fp) = FC_EOF_T; | |
283 | if (fc_sof_needs_ack(ep->class)) | |
284 | fr_eof(fp) = FC_EOF_N; | |
285 | /* | |
3a3b42bf | 286 | * From F_CTL. |
42e9a92f RL |
287 | * The number of fill bytes to make the length a 4-byte |
288 | * multiple is the low order 2-bits of the f_ctl. | |
289 | * The fill itself will have been cleared by the frame | |
290 | * allocation. | |
291 | * After this, the length will be even, as expected by | |
292 | * the transport. | |
293 | */ | |
294 | fill = fr_len(fp) & 3; | |
295 | if (fill) { | |
296 | fill = 4 - fill; | |
297 | /* TODO, this may be a problem with fragmented skb */ | |
298 | skb_put(fp_skb(fp), fill); | |
299 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
300 | } | |
301 | } else { | |
302 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
303 | fr_eof(fp) = FC_EOF_N; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Initialize remainig fh fields | |
308 | * from fc_fill_fc_hdr | |
309 | */ | |
310 | fh->fh_ox_id = htons(ep->oxid); | |
311 | fh->fh_rx_id = htons(ep->rxid); | |
312 | fh->fh_seq_id = ep->seq.id; | |
313 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
314 | } | |
315 | ||
3a3b42bf RL |
316 | /** |
317 | * fc_exch_release() - Decrement an exchange's reference count | |
318 | * @ep: Exchange to be released | |
319 | * | |
320 | * If the reference count reaches zero and the exchange is complete, | |
321 | * it is freed. | |
42e9a92f RL |
322 | */ |
323 | static void fc_exch_release(struct fc_exch *ep) | |
324 | { | |
325 | struct fc_exch_mgr *mp; | |
326 | ||
327 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
328 | mp = ep->em; | |
329 | if (ep->destructor) | |
330 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 331 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
332 | mempool_free(ep, mp->ep_pool); |
333 | } | |
334 | } | |
335 | ||
b29a4f30 VD |
336 | /** |
337 | * fc_exch_timer_cancel() - cancel exch timer | |
338 | * @ep: The exchange whose timer to be canceled | |
339 | */ | |
340 | static inline void fc_exch_timer_cancel(struct fc_exch *ep) | |
341 | { | |
342 | if (cancel_delayed_work(&ep->timeout_work)) { | |
343 | FC_EXCH_DBG(ep, "Exchange timer canceled\n"); | |
344 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
345 | } | |
346 | } | |
347 | ||
348 | /** | |
349 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the | |
350 | * the exchange lock held | |
351 | * @ep: The exchange whose timer will start | |
352 | * @timer_msec: The timeout period | |
353 | * | |
354 | * Used for upper level protocols to time out the exchange. | |
355 | * The timer is cancelled when it fires or when the exchange completes. | |
356 | */ | |
357 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
358 | unsigned int timer_msec) | |
359 | { | |
360 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
361 | return; | |
362 | ||
363 | FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec); | |
364 | ||
365 | if (queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, | |
366 | msecs_to_jiffies(timer_msec))) | |
367 | fc_exch_hold(ep); /* hold for timer */ | |
368 | } | |
369 | ||
370 | /** | |
371 | * fc_exch_timer_set() - Lock the exchange and set the timer | |
372 | * @ep: The exchange whose timer will start | |
373 | * @timer_msec: The timeout period | |
374 | */ | |
375 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
376 | { | |
377 | spin_lock_bh(&ep->ex_lock); | |
378 | fc_exch_timer_set_locked(ep, timer_msec); | |
379 | spin_unlock_bh(&ep->ex_lock); | |
380 | } | |
381 | ||
3a3b42bf RL |
382 | /** |
383 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held | |
384 | * @ep: The exchange that is complete | |
385 | */ | |
42e9a92f RL |
386 | static int fc_exch_done_locked(struct fc_exch *ep) |
387 | { | |
388 | int rc = 1; | |
389 | ||
390 | /* | |
391 | * We must check for completion in case there are two threads | |
392 | * tyring to complete this. But the rrq code will reuse the | |
393 | * ep, and in that case we only clear the resp and set it as | |
394 | * complete, so it can be reused by the timer to send the rrq. | |
395 | */ | |
396 | ep->resp = NULL; | |
397 | if (ep->state & FC_EX_DONE) | |
398 | return rc; | |
399 | ep->esb_stat |= ESB_ST_COMPLETE; | |
400 | ||
401 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
402 | ep->state |= FC_EX_DONE; | |
b29a4f30 | 403 | fc_exch_timer_cancel(ep); |
42e9a92f RL |
404 | rc = 0; |
405 | } | |
406 | return rc; | |
407 | } | |
408 | ||
3a3b42bf RL |
409 | /** |
410 | * fc_exch_ptr_get() - Return an exchange from an exchange pool | |
411 | * @pool: Exchange Pool to get an exchange from | |
412 | * @index: Index of the exchange within the pool | |
413 | * | |
414 | * Use the index to get an exchange from within an exchange pool. exches | |
415 | * will point to an array of exchange pointers. The index will select | |
416 | * the exchange within the array. | |
417 | */ | |
e4bc50be VD |
418 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
419 | u16 index) | |
420 | { | |
421 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); | |
422 | return exches[index]; | |
423 | } | |
424 | ||
3a3b42bf RL |
425 | /** |
426 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool | |
427 | * @pool: The pool to assign the exchange to | |
428 | * @index: The index in the pool where the exchange will be assigned | |
429 | * @ep: The exchange to assign to the pool | |
430 | */ | |
e4bc50be VD |
431 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, |
432 | struct fc_exch *ep) | |
433 | { | |
434 | ((struct fc_exch **)(pool + 1))[index] = ep; | |
435 | } | |
436 | ||
3a3b42bf RL |
437 | /** |
438 | * fc_exch_delete() - Delete an exchange | |
439 | * @ep: The exchange to be deleted | |
440 | */ | |
b2f0091f | 441 | static void fc_exch_delete(struct fc_exch *ep) |
42e9a92f | 442 | { |
b2f0091f | 443 | struct fc_exch_pool *pool; |
2034c19c | 444 | u16 index; |
42e9a92f | 445 | |
b2f0091f VD |
446 | pool = ep->pool; |
447 | spin_lock_bh(&pool->lock); | |
448 | WARN_ON(pool->total_exches <= 0); | |
449 | pool->total_exches--; | |
2034c19c HD |
450 | |
451 | /* update cache of free slot */ | |
452 | index = (ep->xid - ep->em->min_xid) >> fc_cpu_order; | |
453 | if (pool->left == FC_XID_UNKNOWN) | |
454 | pool->left = index; | |
455 | else if (pool->right == FC_XID_UNKNOWN) | |
456 | pool->right = index; | |
457 | else | |
458 | pool->next_index = index; | |
459 | ||
460 | fc_exch_ptr_set(pool, index, NULL); | |
42e9a92f | 461 | list_del(&ep->ex_list); |
b2f0091f | 462 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
463 | fc_exch_release(ep); /* drop hold for exch in mp */ |
464 | } | |
465 | ||
1a7b75ae | 466 | /** |
3a3b42bf RL |
467 | * fc_seq_send() - Send a frame using existing sequence/exchange pair |
468 | * @lport: The local port that the exchange will be sent on | |
469 | * @sp: The sequence to be sent | |
470 | * @fp: The frame to be sent on the exchange | |
1a7b75ae | 471 | */ |
3a3b42bf | 472 | static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, |
1a7b75ae RL |
473 | struct fc_frame *fp) |
474 | { | |
475 | struct fc_exch *ep; | |
476 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
477 | int error; | |
3a3b42bf | 478 | u32 f_ctl; |
14fc315f | 479 | u8 fh_type = fh->fh_type; |
1a7b75ae RL |
480 | |
481 | ep = fc_seq_exch(sp); | |
482 | WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT); | |
483 | ||
484 | f_ctl = ntoh24(fh->fh_f_ctl); | |
485 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
f60e12e9 | 486 | fr_encaps(fp) = ep->encaps; |
1a7b75ae RL |
487 | |
488 | /* | |
489 | * update sequence count if this frame is carrying | |
490 | * multiple FC frames when sequence offload is enabled | |
491 | * by LLD. | |
492 | */ | |
493 | if (fr_max_payload(fp)) | |
494 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
495 | fr_max_payload(fp)); | |
496 | else | |
497 | sp->cnt++; | |
498 | ||
499 | /* | |
500 | * Send the frame. | |
501 | */ | |
3a3b42bf | 502 | error = lport->tt.frame_send(lport, fp); |
1a7b75ae | 503 | |
14fc315f | 504 | if (fh_type == FC_TYPE_BLS) |
77a2b73a VD |
505 | return error; |
506 | ||
1a7b75ae RL |
507 | /* |
508 | * Update the exchange and sequence flags, | |
509 | * assuming all frames for the sequence have been sent. | |
510 | * We can only be called to send once for each sequence. | |
511 | */ | |
512 | spin_lock_bh(&ep->ex_lock); | |
513 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ | |
cc3593d3 | 514 | if (f_ctl & FC_FC_SEQ_INIT) |
1a7b75ae RL |
515 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
516 | spin_unlock_bh(&ep->ex_lock); | |
517 | return error; | |
518 | } | |
519 | ||
520 | /** | |
3a3b42bf RL |
521 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
522 | * @ep: The exchange to allocate a new sequence for | |
523 | * @seq_id: The sequence ID to be used | |
1a7b75ae RL |
524 | * |
525 | * We don't support multiple originated sequences on the same exchange. | |
526 | * By implication, any previously originated sequence on this exchange | |
527 | * is complete, and we reallocate the same sequence. | |
528 | */ | |
529 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
530 | { | |
531 | struct fc_seq *sp; | |
532 | ||
533 | sp = &ep->seq; | |
534 | sp->ssb_stat = 0; | |
535 | sp->cnt = 0; | |
536 | sp->id = seq_id; | |
537 | return sp; | |
538 | } | |
539 | ||
3a3b42bf RL |
540 | /** |
541 | * fc_seq_start_next_locked() - Allocate a new sequence on the same | |
542 | * exchange as the supplied sequence | |
543 | * @sp: The sequence/exchange to get a new sequence for | |
544 | */ | |
1a7b75ae RL |
545 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
546 | { | |
547 | struct fc_exch *ep = fc_seq_exch(sp); | |
548 | ||
549 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
550 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", | |
551 | ep->f_ctl, sp->id); | |
552 | return sp; | |
553 | } | |
554 | ||
555 | /** | |
3a3b42bf RL |
556 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
557 | * for a given sequence/exchange pair | |
558 | * @sp: The sequence/exchange to get a new exchange for | |
1a7b75ae RL |
559 | */ |
560 | static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
561 | { | |
562 | struct fc_exch *ep = fc_seq_exch(sp); | |
563 | ||
564 | spin_lock_bh(&ep->ex_lock); | |
565 | sp = fc_seq_start_next_locked(sp); | |
566 | spin_unlock_bh(&ep->ex_lock); | |
567 | ||
568 | return sp; | |
569 | } | |
570 | ||
1a5c2d7e JE |
571 | /* |
572 | * Set the response handler for the exchange associated with a sequence. | |
573 | */ | |
574 | static void fc_seq_set_resp(struct fc_seq *sp, | |
575 | void (*resp)(struct fc_seq *, struct fc_frame *, | |
576 | void *), | |
577 | void *arg) | |
578 | { | |
579 | struct fc_exch *ep = fc_seq_exch(sp); | |
580 | ||
581 | spin_lock_bh(&ep->ex_lock); | |
582 | ep->resp = resp; | |
583 | ep->arg = arg; | |
584 | spin_unlock_bh(&ep->ex_lock); | |
585 | } | |
586 | ||
1a7b75ae | 587 | /** |
77a2b73a VD |
588 | * fc_exch_abort_locked() - Abort an exchange |
589 | * @ep: The exchange to be aborted | |
3a3b42bf RL |
590 | * @timer_msec: The period of time to wait before aborting |
591 | * | |
77a2b73a VD |
592 | * Locking notes: Called with exch lock held |
593 | * | |
594 | * Return value: 0 on success else error code | |
1a7b75ae | 595 | */ |
77a2b73a VD |
596 | static int fc_exch_abort_locked(struct fc_exch *ep, |
597 | unsigned int timer_msec) | |
42e9a92f RL |
598 | { |
599 | struct fc_seq *sp; | |
42e9a92f RL |
600 | struct fc_frame *fp; |
601 | int error; | |
602 | ||
42e9a92f | 603 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || |
77a2b73a | 604 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) |
42e9a92f | 605 | return -ENXIO; |
42e9a92f RL |
606 | |
607 | /* | |
608 | * Send the abort on a new sequence if possible. | |
609 | */ | |
610 | sp = fc_seq_start_next_locked(&ep->seq); | |
77a2b73a | 611 | if (!sp) |
42e9a92f | 612 | return -ENOMEM; |
42e9a92f RL |
613 | |
614 | ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL; | |
615 | if (timer_msec) | |
616 | fc_exch_timer_set_locked(ep, timer_msec); | |
42e9a92f RL |
617 | |
618 | /* | |
619 | * If not logged into the fabric, don't send ABTS but leave | |
620 | * sequence active until next timeout. | |
621 | */ | |
622 | if (!ep->sid) | |
623 | return 0; | |
624 | ||
625 | /* | |
626 | * Send an abort for the sequence that timed out. | |
627 | */ | |
628 | fp = fc_frame_alloc(ep->lp, 0); | |
629 | if (fp) { | |
630 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
631 | FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
632 | error = fc_seq_send(ep->lp, sp, fp); | |
633 | } else | |
634 | error = -ENOBUFS; | |
635 | return error; | |
636 | } | |
42e9a92f | 637 | |
77a2b73a VD |
638 | /** |
639 | * fc_seq_exch_abort() - Abort an exchange and sequence | |
640 | * @req_sp: The sequence to be aborted | |
641 | * @timer_msec: The period of time to wait before aborting | |
642 | * | |
643 | * Generally called because of a timeout or an abort from the upper layer. | |
644 | * | |
645 | * Return value: 0 on success else error code | |
646 | */ | |
647 | static int fc_seq_exch_abort(const struct fc_seq *req_sp, | |
648 | unsigned int timer_msec) | |
649 | { | |
650 | struct fc_exch *ep; | |
651 | int error; | |
652 | ||
653 | ep = fc_seq_exch(req_sp); | |
654 | spin_lock_bh(&ep->ex_lock); | |
655 | error = fc_exch_abort_locked(ep, timer_msec); | |
656 | spin_unlock_bh(&ep->ex_lock); | |
657 | return error; | |
658 | } | |
659 | ||
3a3b42bf RL |
660 | /** |
661 | * fc_exch_timeout() - Handle exchange timer expiration | |
662 | * @work: The work_struct identifying the exchange that timed out | |
42e9a92f RL |
663 | */ |
664 | static void fc_exch_timeout(struct work_struct *work) | |
665 | { | |
666 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
667 | timeout_work.work); | |
668 | struct fc_seq *sp = &ep->seq; | |
669 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
670 | void *arg; | |
671 | u32 e_stat; | |
672 | int rc = 1; | |
673 | ||
cd305ce4 RL |
674 | FC_EXCH_DBG(ep, "Exchange timed out\n"); |
675 | ||
42e9a92f RL |
676 | spin_lock_bh(&ep->ex_lock); |
677 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
678 | goto unlock; | |
679 | ||
680 | e_stat = ep->esb_stat; | |
681 | if (e_stat & ESB_ST_COMPLETE) { | |
682 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 683 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
684 | if (e_stat & ESB_ST_REC_QUAL) |
685 | fc_exch_rrq(ep); | |
42e9a92f RL |
686 | goto done; |
687 | } else { | |
688 | resp = ep->resp; | |
689 | arg = ep->arg; | |
690 | ep->resp = NULL; | |
691 | if (e_stat & ESB_ST_ABNORMAL) | |
692 | rc = fc_exch_done_locked(ep); | |
693 | spin_unlock_bh(&ep->ex_lock); | |
f3162483 PN |
694 | if (!rc) |
695 | fc_exch_delete(ep); | |
42e9a92f RL |
696 | if (resp) |
697 | resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg); | |
698 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); | |
699 | goto done; | |
700 | } | |
701 | unlock: | |
702 | spin_unlock_bh(&ep->ex_lock); | |
703 | done: | |
704 | /* | |
705 | * This release matches the hold taken when the timer was set. | |
706 | */ | |
707 | fc_exch_release(ep); | |
708 | } | |
709 | ||
52ff878c | 710 | /** |
3a3b42bf RL |
711 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
712 | * @lport: The local port that the exchange is for | |
713 | * @mp: The exchange manager that will allocate the exchange | |
42e9a92f | 714 | * |
d7179680 | 715 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 716 | */ |
52ff878c | 717 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 718 | struct fc_exch_mgr *mp) |
42e9a92f RL |
719 | { |
720 | struct fc_exch *ep; | |
b2f0091f VD |
721 | unsigned int cpu; |
722 | u16 index; | |
723 | struct fc_exch_pool *pool; | |
42e9a92f RL |
724 | |
725 | /* allocate memory for exchange */ | |
726 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
727 | if (!ep) { | |
728 | atomic_inc(&mp->stats.no_free_exch); | |
729 | goto out; | |
730 | } | |
731 | memset(ep, 0, sizeof(*ep)); | |
732 | ||
f018b73a | 733 | cpu = get_cpu(); |
b2f0091f VD |
734 | pool = per_cpu_ptr(mp->pool, cpu); |
735 | spin_lock_bh(&pool->lock); | |
f018b73a | 736 | put_cpu(); |
2034c19c HD |
737 | |
738 | /* peek cache of free slot */ | |
739 | if (pool->left != FC_XID_UNKNOWN) { | |
740 | index = pool->left; | |
741 | pool->left = FC_XID_UNKNOWN; | |
742 | goto hit; | |
743 | } | |
744 | if (pool->right != FC_XID_UNKNOWN) { | |
745 | index = pool->right; | |
746 | pool->right = FC_XID_UNKNOWN; | |
747 | goto hit; | |
748 | } | |
749 | ||
b2f0091f VD |
750 | index = pool->next_index; |
751 | /* allocate new exch from pool */ | |
752 | while (fc_exch_ptr_get(pool, index)) { | |
753 | index = index == mp->pool_max_index ? 0 : index + 1; | |
754 | if (index == pool->next_index) | |
42e9a92f | 755 | goto err; |
42e9a92f | 756 | } |
b2f0091f | 757 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
2034c19c | 758 | hit: |
42e9a92f RL |
759 | fc_exch_hold(ep); /* hold for exch in mp */ |
760 | spin_lock_init(&ep->ex_lock); | |
761 | /* | |
762 | * Hold exch lock for caller to prevent fc_exch_reset() | |
763 | * from releasing exch while fc_exch_alloc() caller is | |
764 | * still working on exch. | |
765 | */ | |
766 | spin_lock_bh(&ep->ex_lock); | |
767 | ||
b2f0091f VD |
768 | fc_exch_ptr_set(pool, index, ep); |
769 | list_add_tail(&ep->ex_list, &pool->ex_list); | |
42e9a92f | 770 | fc_seq_alloc(ep, ep->seq_id++); |
b2f0091f VD |
771 | pool->total_exches++; |
772 | spin_unlock_bh(&pool->lock); | |
42e9a92f RL |
773 | |
774 | /* | |
775 | * update exchange | |
776 | */ | |
b2f0091f | 777 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
42e9a92f | 778 | ep->em = mp; |
b2f0091f | 779 | ep->pool = pool; |
52ff878c | 780 | ep->lp = lport; |
42e9a92f RL |
781 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
782 | ep->rxid = FC_XID_UNKNOWN; | |
783 | ep->class = mp->class; | |
784 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); | |
785 | out: | |
786 | return ep; | |
787 | err: | |
b2f0091f | 788 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
789 | atomic_inc(&mp->stats.no_free_exch_xid); |
790 | mempool_free(ep, mp->ep_pool); | |
791 | return NULL; | |
792 | } | |
52ff878c VD |
793 | |
794 | /** | |
3a3b42bf RL |
795 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
796 | * local port's list of EMs. | |
797 | * @lport: The local port that will own the exchange | |
798 | * @fp: The FC frame that the exchange will be for | |
52ff878c | 799 | * |
3a3b42bf RL |
800 | * This function walks the list of exchange manager(EM) |
801 | * anchors to select an EM for a new exchange allocation. The | |
802 | * EM is selected when a NULL match function pointer is encountered | |
803 | * or when a call to a match function returns true. | |
52ff878c | 804 | */ |
3e22760d VD |
805 | static inline struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
806 | struct fc_frame *fp) | |
52ff878c VD |
807 | { |
808 | struct fc_exch_mgr_anchor *ema; | |
52ff878c | 809 | |
3e22760d VD |
810 | list_for_each_entry(ema, &lport->ema_list, ema_list) |
811 | if (!ema->match || ema->match(fp)) | |
812 | return fc_exch_em_alloc(lport, ema->mp); | |
52ff878c VD |
813 | return NULL; |
814 | } | |
42e9a92f | 815 | |
3a3b42bf RL |
816 | /** |
817 | * fc_exch_find() - Lookup and hold an exchange | |
818 | * @mp: The exchange manager to lookup the exchange from | |
819 | * @xid: The XID of the exchange to look up | |
42e9a92f RL |
820 | */ |
821 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
822 | { | |
b2f0091f | 823 | struct fc_exch_pool *pool; |
42e9a92f RL |
824 | struct fc_exch *ep = NULL; |
825 | ||
826 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
b2f0091f VD |
827 | pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask); |
828 | spin_lock_bh(&pool->lock); | |
829 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); | |
324f6678 | 830 | if (ep && ep->xid == xid) |
42e9a92f | 831 | fc_exch_hold(ep); |
b2f0091f | 832 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
833 | } |
834 | return ep; | |
835 | } | |
836 | ||
1a7b75ae RL |
837 | |
838 | /** | |
839 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and | |
3a3b42bf RL |
840 | * the memory allocated for the related objects may be freed. |
841 | * @sp: The sequence that has completed | |
1a7b75ae RL |
842 | */ |
843 | static void fc_exch_done(struct fc_seq *sp) | |
42e9a92f RL |
844 | { |
845 | struct fc_exch *ep = fc_seq_exch(sp); | |
846 | int rc; | |
847 | ||
848 | spin_lock_bh(&ep->ex_lock); | |
849 | rc = fc_exch_done_locked(ep); | |
850 | spin_unlock_bh(&ep->ex_lock); | |
851 | if (!rc) | |
b2f0091f | 852 | fc_exch_delete(ep); |
42e9a92f | 853 | } |
42e9a92f | 854 | |
3a3b42bf RL |
855 | /** |
856 | * fc_exch_resp() - Allocate a new exchange for a response frame | |
857 | * @lport: The local port that the exchange was for | |
858 | * @mp: The exchange manager to allocate the exchange from | |
859 | * @fp: The response frame | |
860 | * | |
42e9a92f RL |
861 | * Sets the responder ID in the frame header. |
862 | */ | |
52ff878c VD |
863 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
864 | struct fc_exch_mgr *mp, | |
865 | struct fc_frame *fp) | |
42e9a92f RL |
866 | { |
867 | struct fc_exch *ep; | |
868 | struct fc_frame_header *fh; | |
42e9a92f | 869 | |
52ff878c | 870 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
871 | if (ep) { |
872 | ep->class = fc_frame_class(fp); | |
873 | ||
874 | /* | |
875 | * Set EX_CTX indicating we're responding on this exchange. | |
876 | */ | |
877 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
878 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
879 | fh = fc_frame_header_get(fp); | |
880 | ep->sid = ntoh24(fh->fh_d_id); | |
881 | ep->did = ntoh24(fh->fh_s_id); | |
882 | ep->oid = ep->did; | |
883 | ||
884 | /* | |
885 | * Allocated exchange has placed the XID in the | |
886 | * originator field. Move it to the responder field, | |
887 | * and set the originator XID from the frame. | |
888 | */ | |
889 | ep->rxid = ep->xid; | |
890 | ep->oxid = ntohs(fh->fh_ox_id); | |
891 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
892 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
893 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
894 | ||
42e9a92f | 895 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 896 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
897 | } |
898 | return ep; | |
899 | } | |
900 | ||
3a3b42bf RL |
901 | /** |
902 | * fc_seq_lookup_recip() - Find a sequence where the other end | |
903 | * originated the sequence | |
904 | * @lport: The local port that the frame was sent to | |
905 | * @mp: The Exchange Manager to lookup the exchange from | |
906 | * @fp: The frame associated with the sequence we're looking for | |
907 | * | |
42e9a92f RL |
908 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
909 | * on the ep that should be released by the caller. | |
910 | */ | |
52ff878c VD |
911 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
912 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 913 | struct fc_frame *fp) |
42e9a92f RL |
914 | { |
915 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
916 | struct fc_exch *ep = NULL; | |
917 | struct fc_seq *sp = NULL; | |
918 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
919 | u32 f_ctl; | |
920 | u16 xid; | |
921 | ||
922 | f_ctl = ntoh24(fh->fh_f_ctl); | |
923 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
924 | ||
925 | /* | |
926 | * Lookup or create the exchange if we will be creating the sequence. | |
927 | */ | |
928 | if (f_ctl & FC_FC_EX_CTX) { | |
929 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
930 | ep = fc_exch_find(mp, xid); | |
931 | if (!ep) { | |
932 | atomic_inc(&mp->stats.xid_not_found); | |
933 | reject = FC_RJT_OX_ID; | |
934 | goto out; | |
935 | } | |
936 | if (ep->rxid == FC_XID_UNKNOWN) | |
937 | ep->rxid = ntohs(fh->fh_rx_id); | |
938 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
939 | reject = FC_RJT_OX_ID; | |
940 | goto rel; | |
941 | } | |
942 | } else { | |
943 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
944 | ||
945 | /* | |
946 | * Special case for MDS issuing an ELS TEST with a | |
947 | * bad rxid of 0. | |
948 | * XXX take this out once we do the proper reject. | |
949 | */ | |
950 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
951 | fc_frame_payload_op(fp) == ELS_TEST) { | |
952 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
953 | xid = FC_XID_UNKNOWN; | |
954 | } | |
955 | ||
956 | /* | |
957 | * new sequence - find the exchange | |
958 | */ | |
959 | ep = fc_exch_find(mp, xid); | |
960 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
961 | if (ep) { | |
962 | atomic_inc(&mp->stats.xid_busy); | |
963 | reject = FC_RJT_RX_ID; | |
964 | goto rel; | |
965 | } | |
52ff878c | 966 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
967 | if (!ep) { |
968 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
969 | goto out; | |
970 | } | |
971 | xid = ep->xid; /* get our XID */ | |
972 | } else if (!ep) { | |
973 | atomic_inc(&mp->stats.xid_not_found); | |
974 | reject = FC_RJT_RX_ID; /* XID not found */ | |
975 | goto out; | |
976 | } | |
977 | } | |
978 | ||
979 | /* | |
980 | * At this point, we have the exchange held. | |
981 | * Find or create the sequence. | |
982 | */ | |
983 | if (fc_sof_is_init(fr_sof(fp))) { | |
a104c844 | 984 | sp = &ep->seq; |
42e9a92f | 985 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 | 986 | sp->id = fh->fh_seq_id; |
42e9a92f RL |
987 | } else { |
988 | sp = &ep->seq; | |
989 | if (sp->id != fh->fh_seq_id) { | |
990 | atomic_inc(&mp->stats.seq_not_found); | |
e3e65c69 KP |
991 | if (f_ctl & FC_FC_END_SEQ) { |
992 | /* | |
993 | * Update sequence_id based on incoming last | |
994 | * frame of sequence exchange. This is needed | |
1bd49b48 | 995 | * for FC target where DDP has been used |
e3e65c69 KP |
996 | * on target where, stack is indicated only |
997 | * about last frame's (payload _header) header. | |
998 | * Whereas "seq_id" which is part of | |
999 | * frame_header is allocated by initiator | |
1000 | * which is totally different from "seq_id" | |
1001 | * allocated when XFER_RDY was sent by target. | |
1002 | * To avoid false -ve which results into not | |
1003 | * sending RSP, hence write request on other | |
1004 | * end never finishes. | |
1005 | */ | |
1006 | spin_lock_bh(&ep->ex_lock); | |
1007 | sp->ssb_stat |= SSB_ST_RESP; | |
1008 | sp->id = fh->fh_seq_id; | |
1009 | spin_unlock_bh(&ep->ex_lock); | |
1010 | } else { | |
1011 | /* sequence/exch should exist */ | |
1012 | reject = FC_RJT_SEQ_ID; | |
1013 | goto rel; | |
1014 | } | |
42e9a92f RL |
1015 | } |
1016 | } | |
1017 | WARN_ON(ep != fc_seq_exch(sp)); | |
1018 | ||
1019 | if (f_ctl & FC_FC_SEQ_INIT) | |
1020 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1021 | ||
1022 | fr_seq(fp) = sp; | |
1023 | out: | |
1024 | return reject; | |
1025 | rel: | |
1026 | fc_exch_done(&ep->seq); | |
1027 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
1028 | return reject; | |
1029 | } | |
1030 | ||
3a3b42bf RL |
1031 | /** |
1032 | * fc_seq_lookup_orig() - Find a sequence where this end | |
1033 | * originated the sequence | |
1034 | * @mp: The Exchange Manager to lookup the exchange from | |
1035 | * @fp: The frame associated with the sequence we're looking for | |
1036 | * | |
42e9a92f RL |
1037 | * Does not hold the sequence for the caller. |
1038 | */ | |
1039 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
1040 | struct fc_frame *fp) | |
1041 | { | |
1042 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1043 | struct fc_exch *ep; | |
1044 | struct fc_seq *sp = NULL; | |
1045 | u32 f_ctl; | |
1046 | u16 xid; | |
1047 | ||
1048 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1049 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
1050 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
1051 | ep = fc_exch_find(mp, xid); | |
1052 | if (!ep) | |
1053 | return NULL; | |
1054 | if (ep->seq.id == fh->fh_seq_id) { | |
1055 | /* | |
1056 | * Save the RX_ID if we didn't previously know it. | |
1057 | */ | |
1058 | sp = &ep->seq; | |
1059 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
1060 | ep->rxid == FC_XID_UNKNOWN) { | |
1061 | ep->rxid = ntohs(fh->fh_rx_id); | |
1062 | } | |
1063 | } | |
1064 | fc_exch_release(ep); | |
1065 | return sp; | |
1066 | } | |
1067 | ||
3a3b42bf RL |
1068 | /** |
1069 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange | |
1070 | * @ep: The exchange to set the addresses for | |
1071 | * @orig_id: The originator's ID | |
1072 | * @resp_id: The responder's ID | |
1073 | * | |
42e9a92f RL |
1074 | * Note this must be done before the first sequence of the exchange is sent. |
1075 | */ | |
1076 | static void fc_exch_set_addr(struct fc_exch *ep, | |
1077 | u32 orig_id, u32 resp_id) | |
1078 | { | |
1079 | ep->oid = orig_id; | |
1080 | if (ep->esb_stat & ESB_ST_RESP) { | |
1081 | ep->sid = resp_id; | |
1082 | ep->did = orig_id; | |
1083 | } else { | |
1084 | ep->sid = orig_id; | |
1085 | ep->did = resp_id; | |
1086 | } | |
1087 | } | |
1088 | ||
1a7b75ae | 1089 | /** |
25985edc | 1090 | * fc_seq_els_rsp_send() - Send an ELS response using information from |
3a3b42bf | 1091 | * the existing sequence/exchange. |
92261156 | 1092 | * @fp: The received frame |
3a3b42bf RL |
1093 | * @els_cmd: The ELS command to be sent |
1094 | * @els_data: The ELS data to be sent | |
92261156 JE |
1095 | * |
1096 | * The received frame is not freed. | |
42e9a92f | 1097 | */ |
92261156 | 1098 | static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, |
1a7b75ae | 1099 | struct fc_seq_els_data *els_data) |
42e9a92f RL |
1100 | { |
1101 | switch (els_cmd) { | |
1102 | case ELS_LS_RJT: | |
92261156 | 1103 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); |
42e9a92f RL |
1104 | break; |
1105 | case ELS_LS_ACC: | |
92261156 | 1106 | fc_seq_ls_acc(fp); |
42e9a92f RL |
1107 | break; |
1108 | case ELS_RRQ: | |
92261156 | 1109 | fc_exch_els_rrq(fp); |
42e9a92f RL |
1110 | break; |
1111 | case ELS_REC: | |
92261156 | 1112 | fc_exch_els_rec(fp); |
42e9a92f RL |
1113 | break; |
1114 | default: | |
92261156 | 1115 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
1116 | } |
1117 | } | |
42e9a92f | 1118 | |
3a3b42bf RL |
1119 | /** |
1120 | * fc_seq_send_last() - Send a sequence that is the last in the exchange | |
1121 | * @sp: The sequence that is to be sent | |
1122 | * @fp: The frame that will be sent on the sequence | |
1123 | * @rctl: The R_CTL information to be sent | |
1124 | * @fh_type: The frame header type | |
42e9a92f RL |
1125 | */ |
1126 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
1127 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
1128 | { | |
1129 | u32 f_ctl; | |
1130 | struct fc_exch *ep = fc_seq_exch(sp); | |
1131 | ||
1132 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1133 | f_ctl |= ep->f_ctl; | |
1134 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
1135 | fc_seq_send(ep->lp, sp, fp); | |
1136 | } | |
1137 | ||
3a3b42bf RL |
1138 | /** |
1139 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame | |
1140 | * @sp: The sequence to send the ACK on | |
1141 | * @rx_fp: The received frame that is being acknoledged | |
1142 | * | |
42e9a92f | 1143 | * Send ACK_1 (or equiv.) indicating we received something. |
42e9a92f RL |
1144 | */ |
1145 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
1146 | { | |
1147 | struct fc_frame *fp; | |
1148 | struct fc_frame_header *rx_fh; | |
1149 | struct fc_frame_header *fh; | |
1150 | struct fc_exch *ep = fc_seq_exch(sp); | |
3a3b42bf | 1151 | struct fc_lport *lport = ep->lp; |
42e9a92f RL |
1152 | unsigned int f_ctl; |
1153 | ||
1154 | /* | |
1155 | * Don't send ACKs for class 3. | |
1156 | */ | |
1157 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
3a3b42bf | 1158 | fp = fc_frame_alloc(lport, 0); |
42e9a92f RL |
1159 | if (!fp) |
1160 | return; | |
1161 | ||
1162 | fh = fc_frame_header_get(fp); | |
1163 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
1164 | fh->fh_type = FC_TYPE_BLS; | |
1165 | ||
1166 | /* | |
1167 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1168 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1169 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1170 | * Last ACK uses bits 7-6 (continue sequence), | |
1171 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1172 | */ | |
1173 | rx_fh = fc_frame_header_get(rx_fp); | |
1174 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1175 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1176 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
1177 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1178 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1179 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1180 | hton24(fh->fh_f_ctl, f_ctl); | |
1181 | ||
1182 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
1183 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
1184 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1185 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
1186 | ||
1187 | fr_sof(fp) = fr_sof(rx_fp); | |
1188 | if (f_ctl & FC_FC_END_SEQ) | |
1189 | fr_eof(fp) = FC_EOF_T; | |
1190 | else | |
1191 | fr_eof(fp) = FC_EOF_N; | |
1192 | ||
3a3b42bf | 1193 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1194 | } |
1195 | } | |
1196 | ||
3a3b42bf RL |
1197 | /** |
1198 | * fc_exch_send_ba_rjt() - Send BLS Reject | |
1199 | * @rx_fp: The frame being rejected | |
1200 | * @reason: The reason the frame is being rejected | |
25985edc | 1201 | * @explan: The explanation for the rejection |
3a3b42bf | 1202 | * |
42e9a92f RL |
1203 | * This is for rejecting BA_ABTS only. |
1204 | */ | |
b2ab99c9 RL |
1205 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
1206 | enum fc_ba_rjt_reason reason, | |
1207 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
1208 | { |
1209 | struct fc_frame *fp; | |
1210 | struct fc_frame_header *rx_fh; | |
1211 | struct fc_frame_header *fh; | |
1212 | struct fc_ba_rjt *rp; | |
3a3b42bf | 1213 | struct fc_lport *lport; |
42e9a92f RL |
1214 | unsigned int f_ctl; |
1215 | ||
3a3b42bf RL |
1216 | lport = fr_dev(rx_fp); |
1217 | fp = fc_frame_alloc(lport, sizeof(*rp)); | |
42e9a92f RL |
1218 | if (!fp) |
1219 | return; | |
1220 | fh = fc_frame_header_get(fp); | |
1221 | rx_fh = fc_frame_header_get(rx_fp); | |
1222 | ||
1223 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1224 | ||
1225 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1226 | rp->br_reason = reason; | |
1227 | rp->br_explan = explan; | |
1228 | ||
1229 | /* | |
1230 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1231 | */ | |
1232 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1233 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1d490ce3 JE |
1234 | fh->fh_ox_id = rx_fh->fh_ox_id; |
1235 | fh->fh_rx_id = rx_fh->fh_rx_id; | |
42e9a92f RL |
1236 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
1237 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1238 | fh->fh_type = FC_TYPE_BLS; | |
1239 | ||
1240 | /* | |
1241 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1242 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1243 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1244 | * Last ACK uses bits 7-6 (continue sequence), | |
1245 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1246 | * Always set LAST_SEQ, END_SEQ. | |
1247 | */ | |
1248 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1249 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1250 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1251 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1252 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1253 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1254 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1255 | hton24(fh->fh_f_ctl, f_ctl); | |
1256 | ||
1257 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1258 | fr_eof(fp) = FC_EOF_T; | |
1259 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1260 | fr_eof(fp) = FC_EOF_N; | |
1261 | ||
3a3b42bf | 1262 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1263 | } |
1264 | ||
3a3b42bf RL |
1265 | /** |
1266 | * fc_exch_recv_abts() - Handle an incoming ABTS | |
1267 | * @ep: The exchange the abort was on | |
1268 | * @rx_fp: The ABTS frame | |
1269 | * | |
1270 | * This would be for target mode usually, but could be due to lost | |
1271 | * FCP transfer ready, confirm or RRQ. We always handle this as an | |
1272 | * exchange abort, ignoring the parameter. | |
42e9a92f RL |
1273 | */ |
1274 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1275 | { | |
1276 | struct fc_frame *fp; | |
1277 | struct fc_ba_acc *ap; | |
1278 | struct fc_frame_header *fh; | |
1279 | struct fc_seq *sp; | |
1280 | ||
1281 | if (!ep) | |
1282 | goto reject; | |
1283 | spin_lock_bh(&ep->ex_lock); | |
1284 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1285 | spin_unlock_bh(&ep->ex_lock); | |
1286 | goto reject; | |
1287 | } | |
1288 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) | |
1289 | fc_exch_hold(ep); /* hold for REC_QUAL */ | |
1290 | ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL; | |
1291 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1292 | ||
1293 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1294 | if (!fp) { | |
1295 | spin_unlock_bh(&ep->ex_lock); | |
1296 | goto free; | |
1297 | } | |
1298 | fh = fc_frame_header_get(fp); | |
1299 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1300 | memset(ap, 0, sizeof(*ap)); | |
1301 | sp = &ep->seq; | |
1302 | ap->ba_high_seq_cnt = htons(0xffff); | |
1303 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1304 | ap->ba_seq_id = sp->id; | |
1305 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1306 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1307 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1308 | } | |
a7e84f2b | 1309 | sp = fc_seq_start_next_locked(sp); |
42e9a92f RL |
1310 | spin_unlock_bh(&ep->ex_lock); |
1311 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); | |
1312 | fc_frame_free(rx_fp); | |
1313 | return; | |
1314 | ||
1315 | reject: | |
1316 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
1317 | free: | |
1318 | fc_frame_free(rx_fp); | |
1319 | } | |
1320 | ||
239e8104 JE |
1321 | /** |
1322 | * fc_seq_assign() - Assign exchange and sequence for incoming request | |
1323 | * @lport: The local port that received the request | |
1324 | * @fp: The request frame | |
1325 | * | |
1326 | * On success, the sequence pointer will be returned and also in fr_seq(@fp). | |
62bdb645 JE |
1327 | * A reference will be held on the exchange/sequence for the caller, which |
1328 | * must call fc_seq_release(). | |
239e8104 JE |
1329 | */ |
1330 | static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) | |
1331 | { | |
1332 | struct fc_exch_mgr_anchor *ema; | |
1333 | ||
1334 | WARN_ON(lport != fr_dev(fp)); | |
1335 | WARN_ON(fr_seq(fp)); | |
1336 | fr_seq(fp) = NULL; | |
1337 | ||
1338 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1339 | if ((!ema->match || ema->match(fp)) && | |
530994d6 | 1340 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) |
239e8104 JE |
1341 | break; |
1342 | return fr_seq(fp); | |
1343 | } | |
1344 | ||
62bdb645 JE |
1345 | /** |
1346 | * fc_seq_release() - Release the hold | |
1347 | * @sp: The sequence. | |
1348 | */ | |
1349 | static void fc_seq_release(struct fc_seq *sp) | |
1350 | { | |
1351 | fc_exch_release(fc_seq_exch(sp)); | |
1352 | } | |
1353 | ||
3a3b42bf | 1354 | /** |
92261156 | 1355 | * fc_exch_recv_req() - Handler for an incoming request |
3a3b42bf RL |
1356 | * @lport: The local port that received the request |
1357 | * @mp: The EM that the exchange is on | |
1358 | * @fp: The request frame | |
92261156 JE |
1359 | * |
1360 | * This is used when the other end is originating the exchange | |
1361 | * and the sequence. | |
42e9a92f | 1362 | */ |
3a3b42bf | 1363 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
42e9a92f RL |
1364 | struct fc_frame *fp) |
1365 | { | |
1366 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1367 | struct fc_seq *sp = NULL; | |
1368 | struct fc_exch *ep = NULL; | |
42e9a92f RL |
1369 | enum fc_pf_rjt_reason reject; |
1370 | ||
174e1ebf CL |
1371 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
1372 | * problem now that we know a new exchange needs to be allocated | |
1373 | */ | |
3a3b42bf RL |
1374 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
1375 | if (!lport) { | |
174e1ebf CL |
1376 | fc_frame_free(fp); |
1377 | return; | |
1378 | } | |
92261156 JE |
1379 | fr_dev(fp) = lport; |
1380 | ||
1381 | BUG_ON(fr_seq(fp)); /* XXX remove later */ | |
1382 | ||
1383 | /* | |
1384 | * If the RX_ID is 0xffff, don't allocate an exchange. | |
1385 | * The upper-level protocol may request one later, if needed. | |
1386 | */ | |
1387 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) | |
1388 | return lport->tt.lport_recv(lport, fp); | |
174e1ebf | 1389 | |
3a3b42bf | 1390 | reject = fc_seq_lookup_recip(lport, mp, fp); |
42e9a92f RL |
1391 | if (reject == FC_RJT_NONE) { |
1392 | sp = fr_seq(fp); /* sequence will be held */ | |
1393 | ep = fc_seq_exch(sp); | |
42e9a92f | 1394 | fc_seq_send_ack(sp, fp); |
f60e12e9 | 1395 | ep->encaps = fr_encaps(fp); |
42e9a92f RL |
1396 | |
1397 | /* | |
1398 | * Call the receive function. | |
1399 | * | |
1400 | * The receive function may allocate a new sequence | |
1401 | * over the old one, so we shouldn't change the | |
1402 | * sequence after this. | |
1403 | * | |
1404 | * The frame will be freed by the receive function. | |
1405 | * If new exch resp handler is valid then call that | |
1406 | * first. | |
1407 | */ | |
1408 | if (ep->resp) | |
1409 | ep->resp(sp, fp, ep->arg); | |
1410 | else | |
92261156 | 1411 | lport->tt.lport_recv(lport, fp); |
42e9a92f RL |
1412 | fc_exch_release(ep); /* release from lookup */ |
1413 | } else { | |
3a3b42bf RL |
1414 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
1415 | reject); | |
42e9a92f RL |
1416 | fc_frame_free(fp); |
1417 | } | |
1418 | } | |
1419 | ||
3a3b42bf RL |
1420 | /** |
1421 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other | |
1422 | * end is the originator of the sequence that is a | |
1423 | * response to our initial exchange | |
1424 | * @mp: The EM that the exchange is on | |
1425 | * @fp: The response frame | |
42e9a92f RL |
1426 | */ |
1427 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1428 | { | |
1429 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1430 | struct fc_seq *sp; | |
1431 | struct fc_exch *ep; | |
1432 | enum fc_sof sof; | |
1433 | u32 f_ctl; | |
1434 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1435 | void *ex_resp_arg; | |
1436 | int rc; | |
1437 | ||
1438 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1439 | if (!ep) { | |
1440 | atomic_inc(&mp->stats.xid_not_found); | |
1441 | goto out; | |
1442 | } | |
30121d14 SM |
1443 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1444 | atomic_inc(&mp->stats.xid_not_found); | |
8236554a | 1445 | goto rel; |
30121d14 | 1446 | } |
42e9a92f RL |
1447 | if (ep->rxid == FC_XID_UNKNOWN) |
1448 | ep->rxid = ntohs(fh->fh_rx_id); | |
1449 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1450 | atomic_inc(&mp->stats.xid_not_found); | |
1451 | goto rel; | |
1452 | } | |
1453 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1454 | ep->did != FC_FID_FLOGI) { | |
1455 | atomic_inc(&mp->stats.xid_not_found); | |
1456 | goto rel; | |
1457 | } | |
1458 | sof = fr_sof(fp); | |
a104c844 | 1459 | sp = &ep->seq; |
b3667f91 | 1460 | if (fc_sof_is_init(sof)) { |
42e9a92f | 1461 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 JE |
1462 | sp->id = fh->fh_seq_id; |
1463 | } else if (sp->id != fh->fh_seq_id) { | |
1464 | atomic_inc(&mp->stats.seq_not_found); | |
1465 | goto rel; | |
42e9a92f | 1466 | } |
a104c844 | 1467 | |
42e9a92f RL |
1468 | f_ctl = ntoh24(fh->fh_f_ctl); |
1469 | fr_seq(fp) = sp; | |
1470 | if (f_ctl & FC_FC_SEQ_INIT) | |
1471 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1472 | ||
1473 | if (fc_sof_needs_ack(sof)) | |
1474 | fc_seq_send_ack(sp, fp); | |
1475 | resp = ep->resp; | |
1476 | ex_resp_arg = ep->arg; | |
1477 | ||
1478 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1479 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1480 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1481 | spin_lock_bh(&ep->ex_lock); | |
8d23f4ba | 1482 | resp = ep->resp; |
42e9a92f RL |
1483 | rc = fc_exch_done_locked(ep); |
1484 | WARN_ON(fc_seq_exch(sp) != ep); | |
1485 | spin_unlock_bh(&ep->ex_lock); | |
1486 | if (!rc) | |
b2f0091f | 1487 | fc_exch_delete(ep); |
42e9a92f RL |
1488 | } |
1489 | ||
1490 | /* | |
1491 | * Call the receive function. | |
1492 | * The sequence is held (has a refcnt) for us, | |
1493 | * but not for the receive function. | |
1494 | * | |
1495 | * The receive function may allocate a new sequence | |
1496 | * over the old one, so we shouldn't change the | |
1497 | * sequence after this. | |
1498 | * | |
1499 | * The frame will be freed by the receive function. | |
1500 | * If new exch resp handler is valid then call that | |
1501 | * first. | |
1502 | */ | |
1503 | if (resp) | |
1504 | resp(sp, fp, ex_resp_arg); | |
1505 | else | |
1506 | fc_frame_free(fp); | |
1507 | fc_exch_release(ep); | |
1508 | return; | |
1509 | rel: | |
1510 | fc_exch_release(ep); | |
1511 | out: | |
1512 | fc_frame_free(fp); | |
1513 | } | |
1514 | ||
3a3b42bf RL |
1515 | /** |
1516 | * fc_exch_recv_resp() - Handler for a sequence where other end is | |
1517 | * responding to our sequence | |
1518 | * @mp: The EM that the exchange is on | |
1519 | * @fp: The response frame | |
42e9a92f RL |
1520 | */ |
1521 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1522 | { | |
1523 | struct fc_seq *sp; | |
1524 | ||
1525 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1526 | |
1527 | if (!sp) | |
42e9a92f | 1528 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1529 | else |
42e9a92f | 1530 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1531 | |
42e9a92f RL |
1532 | fc_frame_free(fp); |
1533 | } | |
1534 | ||
3a3b42bf RL |
1535 | /** |
1536 | * fc_exch_abts_resp() - Handler for a response to an ABT | |
1537 | * @ep: The exchange that the frame is on | |
1538 | * @fp: The response frame | |
1539 | * | |
1540 | * This response would be to an ABTS cancelling an exchange or sequence. | |
1541 | * The response can be either BA_ACC or BA_RJT | |
42e9a92f RL |
1542 | */ |
1543 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1544 | { | |
1545 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1546 | void *ex_resp_arg; | |
1547 | struct fc_frame_header *fh; | |
1548 | struct fc_ba_acc *ap; | |
1549 | struct fc_seq *sp; | |
1550 | u16 low; | |
1551 | u16 high; | |
1552 | int rc = 1, has_rec = 0; | |
1553 | ||
1554 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1555 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1556 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f | 1557 | |
b29a4f30 VD |
1558 | if (cancel_delayed_work_sync(&ep->timeout_work)) { |
1559 | FC_EXCH_DBG(ep, "Exchange timer canceled\n"); | |
42e9a92f | 1560 | fc_exch_release(ep); /* release from pending timer hold */ |
b29a4f30 | 1561 | } |
42e9a92f RL |
1562 | |
1563 | spin_lock_bh(&ep->ex_lock); | |
1564 | switch (fh->fh_r_ctl) { | |
1565 | case FC_RCTL_BA_ACC: | |
1566 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1567 | if (!ap) | |
1568 | break; | |
1569 | ||
1570 | /* | |
1571 | * Decide whether to establish a Recovery Qualifier. | |
1572 | * We do this if there is a non-empty SEQ_CNT range and | |
1573 | * SEQ_ID is the same as the one we aborted. | |
1574 | */ | |
1575 | low = ntohs(ap->ba_low_seq_cnt); | |
1576 | high = ntohs(ap->ba_high_seq_cnt); | |
1577 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1578 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1579 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1580 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1581 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1582 | has_rec = 1; | |
1583 | } | |
1584 | break; | |
1585 | case FC_RCTL_BA_RJT: | |
1586 | break; | |
1587 | default: | |
1588 | break; | |
1589 | } | |
1590 | ||
1591 | resp = ep->resp; | |
1592 | ex_resp_arg = ep->arg; | |
1593 | ||
1594 | /* do we need to do some other checks here. Can we reuse more of | |
1595 | * fc_exch_recv_seq_resp | |
1596 | */ | |
1597 | sp = &ep->seq; | |
1598 | /* | |
1599 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1600 | */ | |
1601 | if (ep->fh_type != FC_TYPE_FCP && | |
1602 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1603 | rc = fc_exch_done_locked(ep); | |
1604 | spin_unlock_bh(&ep->ex_lock); | |
1605 | if (!rc) | |
b2f0091f | 1606 | fc_exch_delete(ep); |
42e9a92f RL |
1607 | |
1608 | if (resp) | |
1609 | resp(sp, fp, ex_resp_arg); | |
1610 | else | |
1611 | fc_frame_free(fp); | |
1612 | ||
1613 | if (has_rec) | |
1614 | fc_exch_timer_set(ep, ep->r_a_tov); | |
1615 | ||
1616 | } | |
1617 | ||
3a3b42bf RL |
1618 | /** |
1619 | * fc_exch_recv_bls() - Handler for a BLS sequence | |
1620 | * @mp: The EM that the exchange is on | |
1621 | * @fp: The request frame | |
1622 | * | |
1623 | * The BLS frame is always a sequence initiated by the remote side. | |
42e9a92f RL |
1624 | * We may be either the originator or recipient of the exchange. |
1625 | */ | |
1626 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1627 | { | |
1628 | struct fc_frame_header *fh; | |
1629 | struct fc_exch *ep; | |
1630 | u32 f_ctl; | |
1631 | ||
1632 | fh = fc_frame_header_get(fp); | |
1633 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1634 | fr_seq(fp) = NULL; | |
1635 | ||
1636 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1637 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1638 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1639 | spin_lock_bh(&ep->ex_lock); | |
1640 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1641 | spin_unlock_bh(&ep->ex_lock); | |
1642 | } | |
1643 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1644 | /* | |
1645 | * A response to a sequence we initiated. | |
1646 | * This should only be ACKs for class 2 or F. | |
1647 | */ | |
1648 | switch (fh->fh_r_ctl) { | |
1649 | case FC_RCTL_ACK_1: | |
1650 | case FC_RCTL_ACK_0: | |
1651 | break; | |
1652 | default: | |
d4042e9c BPG |
1653 | if (ep) |
1654 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received", | |
1655 | fh->fh_r_ctl, | |
1656 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1657 | break; |
1658 | } | |
1659 | fc_frame_free(fp); | |
1660 | } else { | |
1661 | switch (fh->fh_r_ctl) { | |
1662 | case FC_RCTL_BA_RJT: | |
1663 | case FC_RCTL_BA_ACC: | |
1664 | if (ep) | |
1665 | fc_exch_abts_resp(ep, fp); | |
1666 | else | |
1667 | fc_frame_free(fp); | |
1668 | break; | |
1669 | case FC_RCTL_BA_ABTS: | |
1670 | fc_exch_recv_abts(ep, fp); | |
1671 | break; | |
1672 | default: /* ignore junk */ | |
1673 | fc_frame_free(fp); | |
1674 | break; | |
1675 | } | |
1676 | } | |
1677 | if (ep) | |
1678 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1679 | } | |
1680 | ||
3a3b42bf RL |
1681 | /** |
1682 | * fc_seq_ls_acc() - Accept sequence with LS_ACC | |
92261156 | 1683 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1684 | * |
42e9a92f RL |
1685 | * If this fails due to allocation or transmit congestion, assume the |
1686 | * originator will repeat the sequence. | |
1687 | */ | |
92261156 | 1688 | static void fc_seq_ls_acc(struct fc_frame *rx_fp) |
42e9a92f | 1689 | { |
92261156 | 1690 | struct fc_lport *lport; |
42e9a92f RL |
1691 | struct fc_els_ls_acc *acc; |
1692 | struct fc_frame *fp; | |
1693 | ||
92261156 JE |
1694 | lport = fr_dev(rx_fp); |
1695 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1696 | if (!fp) | |
1697 | return; | |
1698 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1699 | memset(acc, 0, sizeof(*acc)); | |
1700 | acc->la_cmd = ELS_LS_ACC; | |
1701 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1702 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1703 | } |
1704 | ||
3a3b42bf RL |
1705 | /** |
1706 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT | |
92261156 | 1707 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1708 | * @reason: The reason the sequence is being rejected |
92261156 | 1709 | * @explan: The explanation for the rejection |
3a3b42bf | 1710 | * |
42e9a92f RL |
1711 | * If this fails due to allocation or transmit congestion, assume the |
1712 | * originator will repeat the sequence. | |
1713 | */ | |
92261156 | 1714 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, |
42e9a92f RL |
1715 | enum fc_els_rjt_explan explan) |
1716 | { | |
92261156 | 1717 | struct fc_lport *lport; |
42e9a92f RL |
1718 | struct fc_els_ls_rjt *rjt; |
1719 | struct fc_frame *fp; | |
1720 | ||
92261156 JE |
1721 | lport = fr_dev(rx_fp); |
1722 | fp = fc_frame_alloc(lport, sizeof(*rjt)); | |
1723 | if (!fp) | |
1724 | return; | |
1725 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1726 | memset(rjt, 0, sizeof(*rjt)); | |
1727 | rjt->er_cmd = ELS_LS_RJT; | |
1728 | rjt->er_reason = reason; | |
1729 | rjt->er_explan = explan; | |
1730 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1731 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1732 | } |
1733 | ||
3a3b42bf RL |
1734 | /** |
1735 | * fc_exch_reset() - Reset an exchange | |
1736 | * @ep: The exchange to be reset | |
1737 | */ | |
42e9a92f RL |
1738 | static void fc_exch_reset(struct fc_exch *ep) |
1739 | { | |
1740 | struct fc_seq *sp; | |
1741 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
1742 | void *arg; | |
1743 | int rc = 1; | |
1744 | ||
1745 | spin_lock_bh(&ep->ex_lock); | |
77a2b73a | 1746 | fc_exch_abort_locked(ep, 0); |
42e9a92f | 1747 | ep->state |= FC_EX_RST_CLEANUP; |
b29a4f30 | 1748 | fc_exch_timer_cancel(ep); |
42e9a92f RL |
1749 | resp = ep->resp; |
1750 | ep->resp = NULL; | |
1751 | if (ep->esb_stat & ESB_ST_REC_QUAL) | |
1752 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1753 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1754 | arg = ep->arg; | |
1755 | sp = &ep->seq; | |
1756 | rc = fc_exch_done_locked(ep); | |
1757 | spin_unlock_bh(&ep->ex_lock); | |
1758 | if (!rc) | |
b2f0091f | 1759 | fc_exch_delete(ep); |
42e9a92f RL |
1760 | |
1761 | if (resp) | |
1762 | resp(sp, ERR_PTR(-FC_EX_CLOSED), arg); | |
1763 | } | |
1764 | ||
b2f0091f | 1765 | /** |
3a3b42bf RL |
1766 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
1767 | * @lport: The local port that the exchange pool is on | |
1768 | * @pool: The exchange pool to be reset | |
1769 | * @sid: The source ID | |
1770 | * @did: The destination ID | |
b2f0091f | 1771 | * |
3a3b42bf RL |
1772 | * Resets a per cpu exches pool, releasing all of its sequences |
1773 | * and exchanges. If sid is non-zero then reset only exchanges | |
1774 | * we sourced from the local port's FID. If did is non-zero then | |
1775 | * only reset exchanges destined for the local port's FID. | |
42e9a92f | 1776 | */ |
b2f0091f VD |
1777 | static void fc_exch_pool_reset(struct fc_lport *lport, |
1778 | struct fc_exch_pool *pool, | |
1779 | u32 sid, u32 did) | |
42e9a92f RL |
1780 | { |
1781 | struct fc_exch *ep; | |
1782 | struct fc_exch *next; | |
1783 | ||
b2f0091f | 1784 | spin_lock_bh(&pool->lock); |
42e9a92f | 1785 | restart: |
b2f0091f VD |
1786 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
1787 | if ((lport == ep->lp) && | |
1788 | (sid == 0 || sid == ep->sid) && | |
1789 | (did == 0 || did == ep->did)) { | |
1790 | fc_exch_hold(ep); | |
1791 | spin_unlock_bh(&pool->lock); | |
1792 | ||
1793 | fc_exch_reset(ep); | |
1794 | ||
1795 | fc_exch_release(ep); | |
1796 | spin_lock_bh(&pool->lock); | |
1797 | ||
1798 | /* | |
1799 | * must restart loop incase while lock | |
1800 | * was down multiple eps were released. | |
1801 | */ | |
1802 | goto restart; | |
42e9a92f | 1803 | } |
b2f0091f | 1804 | } |
b6e3c840 VD |
1805 | pool->next_index = 0; |
1806 | pool->left = FC_XID_UNKNOWN; | |
1807 | pool->right = FC_XID_UNKNOWN; | |
b2f0091f VD |
1808 | spin_unlock_bh(&pool->lock); |
1809 | } | |
1810 | ||
1811 | /** | |
3a3b42bf RL |
1812 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
1813 | * @lport: The local port whose EMs are to be reset | |
1814 | * @sid: The source ID | |
1815 | * @did: The destination ID | |
b2f0091f | 1816 | * |
3a3b42bf RL |
1817 | * Reset all EMs associated with a given local port. Release all |
1818 | * sequences and exchanges. If sid is non-zero then reset only the | |
1819 | * exchanges sent from the local port's FID. If did is non-zero then | |
1820 | * reset only exchanges destined for the local port's FID. | |
b2f0091f VD |
1821 | */ |
1822 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) | |
1823 | { | |
1824 | struct fc_exch_mgr_anchor *ema; | |
1825 | unsigned int cpu; | |
1826 | ||
1827 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
1828 | for_each_possible_cpu(cpu) | |
1829 | fc_exch_pool_reset(lport, | |
1830 | per_cpu_ptr(ema->mp->pool, cpu), | |
1831 | sid, did); | |
42e9a92f | 1832 | } |
42e9a92f RL |
1833 | } |
1834 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1835 | ||
92261156 JE |
1836 | /** |
1837 | * fc_exch_lookup() - find an exchange | |
1838 | * @lport: The local port | |
1839 | * @xid: The exchange ID | |
1840 | * | |
1841 | * Returns exchange pointer with hold for caller, or NULL if not found. | |
1842 | */ | |
1843 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) | |
1844 | { | |
1845 | struct fc_exch_mgr_anchor *ema; | |
1846 | ||
1847 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1848 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) | |
1849 | return fc_exch_find(ema->mp, xid); | |
1850 | return NULL; | |
1851 | } | |
1852 | ||
3a3b42bf RL |
1853 | /** |
1854 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests | |
92261156 | 1855 | * @rfp: The REC frame, not freed here. |
3a3b42bf | 1856 | * |
42e9a92f RL |
1857 | * Note that the requesting port may be different than the S_ID in the request. |
1858 | */ | |
92261156 | 1859 | static void fc_exch_els_rec(struct fc_frame *rfp) |
42e9a92f | 1860 | { |
92261156 | 1861 | struct fc_lport *lport; |
42e9a92f RL |
1862 | struct fc_frame *fp; |
1863 | struct fc_exch *ep; | |
42e9a92f RL |
1864 | struct fc_els_rec *rp; |
1865 | struct fc_els_rec_acc *acc; | |
1866 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1867 | enum fc_els_rjt_explan explan; | |
1868 | u32 sid; | |
1869 | u16 rxid; | |
1870 | u16 oxid; | |
1871 | ||
92261156 | 1872 | lport = fr_dev(rfp); |
42e9a92f RL |
1873 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); |
1874 | explan = ELS_EXPL_INV_LEN; | |
1875 | if (!rp) | |
1876 | goto reject; | |
1877 | sid = ntoh24(rp->rec_s_id); | |
1878 | rxid = ntohs(rp->rec_rx_id); | |
1879 | oxid = ntohs(rp->rec_ox_id); | |
1880 | ||
92261156 JE |
1881 | ep = fc_exch_lookup(lport, |
1882 | sid == fc_host_port_id(lport->host) ? oxid : rxid); | |
42e9a92f | 1883 | explan = ELS_EXPL_OXID_RXID; |
92261156 JE |
1884 | if (!ep) |
1885 | goto reject; | |
1886 | if (ep->oid != sid || oxid != ep->oxid) | |
1887 | goto rel; | |
1888 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) | |
1889 | goto rel; | |
1890 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1891 | if (!fp) | |
42e9a92f | 1892 | goto out; |
92261156 | 1893 | |
42e9a92f RL |
1894 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
1895 | memset(acc, 0, sizeof(*acc)); | |
1896 | acc->reca_cmd = ELS_LS_ACC; | |
1897 | acc->reca_ox_id = rp->rec_ox_id; | |
1898 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1899 | acc->reca_rx_id = htons(ep->rxid); | |
1900 | if (ep->sid == ep->oid) | |
1901 | hton24(acc->reca_rfid, ep->did); | |
1902 | else | |
1903 | hton24(acc->reca_rfid, ep->sid); | |
1904 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1905 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1906 | ESB_ST_SEQ_INIT | | |
1907 | ESB_ST_COMPLETE)); | |
92261156 JE |
1908 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); |
1909 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1910 | out: |
1911 | fc_exch_release(ep); | |
42e9a92f RL |
1912 | return; |
1913 | ||
1914 | rel: | |
1915 | fc_exch_release(ep); | |
1916 | reject: | |
92261156 | 1917 | fc_seq_ls_rjt(rfp, reason, explan); |
42e9a92f RL |
1918 | } |
1919 | ||
3a3b42bf RL |
1920 | /** |
1921 | * fc_exch_rrq_resp() - Handler for RRQ responses | |
1922 | * @sp: The sequence that the RRQ is on | |
1923 | * @fp: The RRQ frame | |
1924 | * @arg: The exchange that the RRQ is on | |
42e9a92f RL |
1925 | * |
1926 | * TODO: fix error handler. | |
1927 | */ | |
1928 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
1929 | { | |
1930 | struct fc_exch *aborted_ep = arg; | |
1931 | unsigned int op; | |
1932 | ||
1933 | if (IS_ERR(fp)) { | |
1934 | int err = PTR_ERR(fp); | |
1935 | ||
78342da3 | 1936 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 1937 | goto cleanup; |
7414705e RL |
1938 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
1939 | "frame error %d\n", err); | |
42e9a92f RL |
1940 | return; |
1941 | } | |
1942 | ||
1943 | op = fc_frame_payload_op(fp); | |
1944 | fc_frame_free(fp); | |
1945 | ||
1946 | switch (op) { | |
1947 | case ELS_LS_RJT: | |
7414705e | 1948 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ"); |
42e9a92f RL |
1949 | /* fall through */ |
1950 | case ELS_LS_ACC: | |
1951 | goto cleanup; | |
1952 | default: | |
7414705e RL |
1953 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x " |
1954 | "for RRQ", op); | |
42e9a92f RL |
1955 | return; |
1956 | } | |
1957 | ||
1958 | cleanup: | |
1959 | fc_exch_done(&aborted_ep->seq); | |
1960 | /* drop hold for rec qual */ | |
1961 | fc_exch_release(aborted_ep); | |
1962 | } | |
1963 | ||
1a7b75ae RL |
1964 | |
1965 | /** | |
3a3b42bf RL |
1966 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
1967 | * @lport: The local port to send the frame on | |
1968 | * @fp: The frame to be sent | |
1969 | * @resp: The response handler for this request | |
1970 | * @destructor: The destructor for the exchange | |
1971 | * @arg: The argument to be passed to the response handler | |
1972 | * @timer_msec: The timeout period for the exchange | |
1973 | * | |
1974 | * The frame pointer with some of the header's fields must be | |
1975 | * filled before calling this routine, those fields are: | |
1976 | * | |
1977 | * - routing control | |
1978 | * - FC port did | |
1979 | * - FC port sid | |
1980 | * - FC header type | |
1981 | * - frame control | |
1982 | * - parameter or relative offset | |
1a7b75ae | 1983 | */ |
3a3b42bf | 1984 | static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
1a7b75ae RL |
1985 | struct fc_frame *fp, |
1986 | void (*resp)(struct fc_seq *, | |
1987 | struct fc_frame *fp, | |
1988 | void *arg), | |
1989 | void (*destructor)(struct fc_seq *, | |
1990 | void *), | |
1991 | void *arg, u32 timer_msec) | |
1992 | { | |
1993 | struct fc_exch *ep; | |
1994 | struct fc_seq *sp = NULL; | |
1995 | struct fc_frame_header *fh; | |
3ee17f59 | 1996 | struct fc_fcp_pkt *fsp = NULL; |
1a7b75ae RL |
1997 | int rc = 1; |
1998 | ||
3a3b42bf | 1999 | ep = fc_exch_alloc(lport, fp); |
1a7b75ae RL |
2000 | if (!ep) { |
2001 | fc_frame_free(fp); | |
2002 | return NULL; | |
2003 | } | |
2004 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
2005 | fh = fc_frame_header_get(fp); | |
2006 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
2007 | ep->resp = resp; | |
2008 | ep->destructor = destructor; | |
2009 | ep->arg = arg; | |
2010 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
3a3b42bf | 2011 | ep->lp = lport; |
1a7b75ae RL |
2012 | sp = &ep->seq; |
2013 | ||
2014 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
2015 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
2016 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
2017 | sp->cnt++; | |
2018 | ||
3ee17f59 YZ |
2019 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) { |
2020 | fsp = fr_fsp(fp); | |
1a7b75ae | 2021 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
3ee17f59 | 2022 | } |
1a7b75ae | 2023 | |
3a3b42bf | 2024 | if (unlikely(lport->tt.frame_send(lport, fp))) |
1a7b75ae RL |
2025 | goto err; |
2026 | ||
2027 | if (timer_msec) | |
2028 | fc_exch_timer_set_locked(ep, timer_msec); | |
2029 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
2030 | ||
2031 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
2032 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
2033 | spin_unlock_bh(&ep->ex_lock); | |
2034 | return sp; | |
2035 | err: | |
3ee17f59 YZ |
2036 | if (fsp) |
2037 | fc_fcp_ddp_done(fsp); | |
1a7b75ae RL |
2038 | rc = fc_exch_done_locked(ep); |
2039 | spin_unlock_bh(&ep->ex_lock); | |
2040 | if (!rc) | |
2041 | fc_exch_delete(ep); | |
2042 | return NULL; | |
2043 | } | |
2044 | ||
3a3b42bf RL |
2045 | /** |
2046 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command | |
2047 | * @ep: The exchange to send the RRQ on | |
2048 | * | |
42e9a92f RL |
2049 | * This tells the remote port to stop blocking the use of |
2050 | * the exchange and the seq_cnt range. | |
2051 | */ | |
2052 | static void fc_exch_rrq(struct fc_exch *ep) | |
2053 | { | |
3a3b42bf | 2054 | struct fc_lport *lport; |
42e9a92f RL |
2055 | struct fc_els_rrq *rrq; |
2056 | struct fc_frame *fp; | |
42e9a92f RL |
2057 | u32 did; |
2058 | ||
3a3b42bf | 2059 | lport = ep->lp; |
42e9a92f | 2060 | |
3a3b42bf | 2061 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
42e9a92f | 2062 | if (!fp) |
a0cc1ecc VD |
2063 | goto retry; |
2064 | ||
42e9a92f RL |
2065 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
2066 | memset(rrq, 0, sizeof(*rrq)); | |
2067 | rrq->rrq_cmd = ELS_RRQ; | |
2068 | hton24(rrq->rrq_s_id, ep->sid); | |
2069 | rrq->rrq_ox_id = htons(ep->oxid); | |
2070 | rrq->rrq_rx_id = htons(ep->rxid); | |
2071 | ||
2072 | did = ep->did; | |
2073 | if (ep->esb_stat & ESB_ST_RESP) | |
2074 | did = ep->sid; | |
2075 | ||
2076 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
7b2787ec | 2077 | lport->port_id, FC_TYPE_ELS, |
42e9a92f RL |
2078 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
2079 | ||
3a3b42bf RL |
2080 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
2081 | lport->e_d_tov)) | |
a0cc1ecc VD |
2082 | return; |
2083 | ||
2084 | retry: | |
2085 | spin_lock_bh(&ep->ex_lock); | |
2086 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
2087 | spin_unlock_bh(&ep->ex_lock); | |
2088 | /* drop hold for rec qual */ | |
2089 | fc_exch_release(ep); | |
42e9a92f RL |
2090 | return; |
2091 | } | |
a0cc1ecc VD |
2092 | ep->esb_stat |= ESB_ST_REC_QUAL; |
2093 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
2094 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
2095 | } |
2096 | ||
3a3b42bf RL |
2097 | /** |
2098 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests | |
92261156 | 2099 | * @fp: The RRQ frame, not freed here. |
42e9a92f | 2100 | */ |
92261156 | 2101 | static void fc_exch_els_rrq(struct fc_frame *fp) |
42e9a92f | 2102 | { |
92261156 | 2103 | struct fc_lport *lport; |
3f127ad9 | 2104 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
42e9a92f RL |
2105 | struct fc_els_rrq *rp; |
2106 | u32 sid; | |
2107 | u16 xid; | |
2108 | enum fc_els_rjt_explan explan; | |
2109 | ||
92261156 | 2110 | lport = fr_dev(fp); |
42e9a92f RL |
2111 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
2112 | explan = ELS_EXPL_INV_LEN; | |
2113 | if (!rp) | |
2114 | goto reject; | |
2115 | ||
2116 | /* | |
2117 | * lookup subject exchange. | |
2118 | */ | |
42e9a92f | 2119 | sid = ntoh24(rp->rrq_s_id); /* subject source */ |
92261156 JE |
2120 | xid = fc_host_port_id(lport->host) == sid ? |
2121 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
2122 | ep = fc_exch_lookup(lport, xid); | |
42e9a92f RL |
2123 | explan = ELS_EXPL_OXID_RXID; |
2124 | if (!ep) | |
2125 | goto reject; | |
2126 | spin_lock_bh(&ep->ex_lock); | |
2127 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
2128 | goto unlock_reject; | |
2129 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
2130 | ep->rxid != FC_XID_UNKNOWN) | |
2131 | goto unlock_reject; | |
2132 | explan = ELS_EXPL_SID; | |
2133 | if (ep->sid != sid) | |
2134 | goto unlock_reject; | |
2135 | ||
2136 | /* | |
2137 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
2138 | */ | |
2139 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
2140 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
2141 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
2142 | } | |
b29a4f30 VD |
2143 | if (ep->esb_stat & ESB_ST_COMPLETE) |
2144 | fc_exch_timer_cancel(ep); | |
42e9a92f RL |
2145 | |
2146 | spin_unlock_bh(&ep->ex_lock); | |
2147 | ||
2148 | /* | |
2149 | * Send LS_ACC. | |
2150 | */ | |
92261156 | 2151 | fc_seq_ls_acc(fp); |
3f127ad9 | 2152 | goto out; |
42e9a92f RL |
2153 | |
2154 | unlock_reject: | |
2155 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f | 2156 | reject: |
92261156 | 2157 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); |
3f127ad9 | 2158 | out: |
3f127ad9 VD |
2159 | if (ep) |
2160 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
42e9a92f RL |
2161 | } |
2162 | ||
4e5fae7a VD |
2163 | /** |
2164 | * fc_exch_update_stats() - update exches stats to lport | |
2165 | * @lport: The local port to update exchange manager stats | |
2166 | */ | |
2167 | void fc_exch_update_stats(struct fc_lport *lport) | |
2168 | { | |
2169 | struct fc_host_statistics *st; | |
2170 | struct fc_exch_mgr_anchor *ema; | |
2171 | struct fc_exch_mgr *mp; | |
2172 | ||
2173 | st = &lport->host_stats; | |
2174 | ||
2175 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2176 | mp = ema->mp; | |
2177 | st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch); | |
2178 | st->fc_no_free_exch_xid += | |
2179 | atomic_read(&mp->stats.no_free_exch_xid); | |
2180 | st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found); | |
2181 | st->fc_xid_busy += atomic_read(&mp->stats.xid_busy); | |
2182 | st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found); | |
2183 | st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp); | |
2184 | } | |
2185 | } | |
2186 | EXPORT_SYMBOL(fc_exch_update_stats); | |
2187 | ||
3a3b42bf RL |
2188 | /** |
2189 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs | |
2190 | * @lport: The local port to add the exchange manager to | |
2191 | * @mp: The exchange manager to be added to the local port | |
2192 | * @match: The match routine that indicates when this EM should be used | |
2193 | */ | |
96316099 VD |
2194 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
2195 | struct fc_exch_mgr *mp, | |
2196 | bool (*match)(struct fc_frame *)) | |
2197 | { | |
2198 | struct fc_exch_mgr_anchor *ema; | |
2199 | ||
2200 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
2201 | if (!ema) | |
2202 | return ema; | |
2203 | ||
2204 | ema->mp = mp; | |
2205 | ema->match = match; | |
2206 | /* add EM anchor to EM anchors list */ | |
2207 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
2208 | kref_get(&mp->kref); | |
2209 | return ema; | |
2210 | } | |
2211 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
2212 | ||
3a3b42bf RL |
2213 | /** |
2214 | * fc_exch_mgr_destroy() - Destroy an exchange manager | |
2215 | * @kref: The reference to the EM to be destroyed | |
2216 | */ | |
96316099 VD |
2217 | static void fc_exch_mgr_destroy(struct kref *kref) |
2218 | { | |
2219 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
2220 | ||
96316099 | 2221 | mempool_destroy(mp->ep_pool); |
e4bc50be | 2222 | free_percpu(mp->pool); |
96316099 VD |
2223 | kfree(mp); |
2224 | } | |
2225 | ||
3a3b42bf RL |
2226 | /** |
2227 | * fc_exch_mgr_del() - Delete an EM from a local port's list | |
2228 | * @ema: The exchange manager anchor identifying the EM to be deleted | |
2229 | */ | |
96316099 VD |
2230 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
2231 | { | |
2232 | /* remove EM anchor from EM anchors list */ | |
2233 | list_del(&ema->ema_list); | |
2234 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
2235 | kfree(ema); | |
2236 | } | |
2237 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
2238 | ||
174e1ebf | 2239 | /** |
3a3b42bf RL |
2240 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
2241 | * @src: Source lport to clone exchange managers from | |
2242 | * @dst: New lport that takes references to all the exchange managers | |
174e1ebf CL |
2243 | */ |
2244 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) | |
2245 | { | |
2246 | struct fc_exch_mgr_anchor *ema, *tmp; | |
2247 | ||
2248 | list_for_each_entry(ema, &src->ema_list, ema_list) { | |
2249 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) | |
2250 | goto err; | |
2251 | } | |
2252 | return 0; | |
2253 | err: | |
2254 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) | |
2255 | fc_exch_mgr_del(ema); | |
2256 | return -ENOMEM; | |
2257 | } | |
72fa396b | 2258 | EXPORT_SYMBOL(fc_exch_mgr_list_clone); |
174e1ebf | 2259 | |
3a3b42bf RL |
2260 | /** |
2261 | * fc_exch_mgr_alloc() - Allocate an exchange manager | |
2262 | * @lport: The local port that the new EM will be associated with | |
2263 | * @class: The default FC class for new exchanges | |
2264 | * @min_xid: The minimum XID for exchanges from the new EM | |
2265 | * @max_xid: The maximum XID for exchanges from the new EM | |
2266 | * @match: The match routine for the new EM | |
2267 | */ | |
2268 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, | |
42e9a92f | 2269 | enum fc_class class, |
52ff878c VD |
2270 | u16 min_xid, u16 max_xid, |
2271 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
2272 | { |
2273 | struct fc_exch_mgr *mp; | |
e4bc50be VD |
2274 | u16 pool_exch_range; |
2275 | size_t pool_size; | |
2276 | unsigned int cpu; | |
2277 | struct fc_exch_pool *pool; | |
42e9a92f | 2278 | |
e4bc50be VD |
2279 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
2280 | (min_xid & fc_cpu_mask) != 0) { | |
3a3b42bf | 2281 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
7414705e | 2282 | min_xid, max_xid); |
42e9a92f RL |
2283 | return NULL; |
2284 | } | |
2285 | ||
2286 | /* | |
b2f0091f | 2287 | * allocate memory for EM |
42e9a92f | 2288 | */ |
b2f0091f | 2289 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
42e9a92f RL |
2290 | if (!mp) |
2291 | return NULL; | |
2292 | ||
2293 | mp->class = class; | |
42e9a92f RL |
2294 | /* adjust em exch xid range for offload */ |
2295 | mp->min_xid = min_xid; | |
011a9008 SC |
2296 | |
2297 | /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */ | |
2298 | pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) / | |
2299 | sizeof(struct fc_exch *); | |
2300 | if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) { | |
2301 | mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) + | |
2302 | min_xid - 1; | |
2303 | } else { | |
2304 | mp->max_xid = max_xid; | |
2305 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / | |
2306 | (fc_cpu_mask + 1); | |
2307 | } | |
42e9a92f RL |
2308 | |
2309 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
2310 | if (!mp->ep_pool) | |
2311 | goto free_mp; | |
2312 | ||
e4bc50be VD |
2313 | /* |
2314 | * Setup per cpu exch pool with entire exchange id range equally | |
2315 | * divided across all cpus. The exch pointers array memory is | |
2316 | * allocated for exch range per pool. | |
2317 | */ | |
e4bc50be VD |
2318 | mp->pool_max_index = pool_exch_range - 1; |
2319 | ||
2320 | /* | |
2321 | * Allocate and initialize per cpu exch pool | |
2322 | */ | |
2323 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
2324 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
2325 | if (!mp->pool) | |
2326 | goto free_mempool; | |
2327 | for_each_possible_cpu(cpu) { | |
2328 | pool = per_cpu_ptr(mp->pool, cpu); | |
b6e3c840 | 2329 | pool->next_index = 0; |
2034c19c HD |
2330 | pool->left = FC_XID_UNKNOWN; |
2331 | pool->right = FC_XID_UNKNOWN; | |
e4bc50be VD |
2332 | spin_lock_init(&pool->lock); |
2333 | INIT_LIST_HEAD(&pool->ex_list); | |
2334 | } | |
2335 | ||
52ff878c | 2336 | kref_init(&mp->kref); |
3a3b42bf | 2337 | if (!fc_exch_mgr_add(lport, mp, match)) { |
e4bc50be VD |
2338 | free_percpu(mp->pool); |
2339 | goto free_mempool; | |
52ff878c VD |
2340 | } |
2341 | ||
2342 | /* | |
2343 | * Above kref_init() sets mp->kref to 1 and then | |
2344 | * call to fc_exch_mgr_add incremented mp->kref again, | |
2345 | * so adjust that extra increment. | |
2346 | */ | |
2347 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
2348 | return mp; |
2349 | ||
e4bc50be VD |
2350 | free_mempool: |
2351 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
2352 | free_mp: |
2353 | kfree(mp); | |
2354 | return NULL; | |
2355 | } | |
2356 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
2357 | ||
3a3b42bf RL |
2358 | /** |
2359 | * fc_exch_mgr_free() - Free all exchange managers on a local port | |
2360 | * @lport: The local port whose EMs are to be freed | |
2361 | */ | |
52ff878c | 2362 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 2363 | { |
52ff878c VD |
2364 | struct fc_exch_mgr_anchor *ema, *next; |
2365 | ||
4ae1e19f | 2366 | flush_workqueue(fc_exch_workqueue); |
52ff878c VD |
2367 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
2368 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
2369 | } |
2370 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
2371 | ||
6c8cc1c0 KP |
2372 | /** |
2373 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending | |
2374 | * upon 'xid'. | |
2375 | * @f_ctl: f_ctl | |
2376 | * @lport: The local port the frame was received on | |
2377 | * @fh: The received frame header | |
2378 | */ | |
2379 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, | |
2380 | struct fc_lport *lport, | |
2381 | struct fc_frame_header *fh) | |
2382 | { | |
2383 | struct fc_exch_mgr_anchor *ema; | |
2384 | u16 xid; | |
2385 | ||
2386 | if (f_ctl & FC_FC_EX_CTX) | |
2387 | xid = ntohs(fh->fh_ox_id); | |
2388 | else { | |
2389 | xid = ntohs(fh->fh_rx_id); | |
2390 | if (xid == FC_XID_UNKNOWN) | |
2391 | return list_entry(lport->ema_list.prev, | |
2392 | typeof(*ema), ema_list); | |
2393 | } | |
2394 | ||
2395 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2396 | if ((xid >= ema->mp->min_xid) && | |
2397 | (xid <= ema->mp->max_xid)) | |
2398 | return ema; | |
2399 | } | |
2400 | return NULL; | |
2401 | } | |
3a3b42bf RL |
2402 | /** |
2403 | * fc_exch_recv() - Handler for received frames | |
2404 | * @lport: The local port the frame was received on | |
6c8cc1c0 | 2405 | * @fp: The received frame |
42e9a92f | 2406 | */ |
3a3b42bf | 2407 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
2408 | { |
2409 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c | 2410 | struct fc_exch_mgr_anchor *ema; |
6c8cc1c0 | 2411 | u32 f_ctl; |
42e9a92f RL |
2412 | |
2413 | /* lport lock ? */ | |
3a3b42bf RL |
2414 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
2415 | FC_LPORT_DBG(lport, "Receiving frames for an lport that " | |
7414705e | 2416 | "has not been initialized correctly\n"); |
42e9a92f RL |
2417 | fc_frame_free(fp); |
2418 | return; | |
2419 | } | |
2420 | ||
52ff878c | 2421 | f_ctl = ntoh24(fh->fh_f_ctl); |
6c8cc1c0 KP |
2422 | ema = fc_find_ema(f_ctl, lport, fh); |
2423 | if (!ema) { | |
2424 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," | |
2425 | "fc_ctl <0x%x>, xid <0x%x>\n", | |
2426 | f_ctl, | |
2427 | (f_ctl & FC_FC_EX_CTX) ? | |
2428 | ntohs(fh->fh_ox_id) : | |
2429 | ntohs(fh->fh_rx_id)); | |
2430 | fc_frame_free(fp); | |
2431 | return; | |
2432 | } | |
52ff878c | 2433 | |
42e9a92f RL |
2434 | /* |
2435 | * If frame is marked invalid, just drop it. | |
2436 | */ | |
42e9a92f RL |
2437 | switch (fr_eof(fp)) { |
2438 | case FC_EOF_T: | |
2439 | if (f_ctl & FC_FC_END_SEQ) | |
2440 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
2441 | /* fall through */ | |
2442 | case FC_EOF_N: | |
2443 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2444 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2445 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2446 | FC_FC_EX_CTX) | |
52ff878c | 2447 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2448 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2449 | fc_exch_recv_resp(ema->mp, fp); |
92261156 | 2450 | else /* no EX_CTX and no SEQ_CTX */ |
3a3b42bf | 2451 | fc_exch_recv_req(lport, ema->mp, fp); |
42e9a92f RL |
2452 | break; |
2453 | default: | |
3a3b42bf RL |
2454 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
2455 | fr_eof(fp)); | |
42e9a92f | 2456 | fc_frame_free(fp); |
42e9a92f RL |
2457 | } |
2458 | } | |
2459 | EXPORT_SYMBOL(fc_exch_recv); | |
2460 | ||
3a3b42bf RL |
2461 | /** |
2462 | * fc_exch_init() - Initialize the exchange layer for a local port | |
2463 | * @lport: The local port to initialize the exchange layer for | |
2464 | */ | |
2465 | int fc_exch_init(struct fc_lport *lport) | |
42e9a92f | 2466 | { |
3a3b42bf RL |
2467 | if (!lport->tt.seq_start_next) |
2468 | lport->tt.seq_start_next = fc_seq_start_next; | |
42e9a92f | 2469 | |
1a5c2d7e JE |
2470 | if (!lport->tt.seq_set_resp) |
2471 | lport->tt.seq_set_resp = fc_seq_set_resp; | |
2472 | ||
3a3b42bf RL |
2473 | if (!lport->tt.exch_seq_send) |
2474 | lport->tt.exch_seq_send = fc_exch_seq_send; | |
42e9a92f | 2475 | |
3a3b42bf RL |
2476 | if (!lport->tt.seq_send) |
2477 | lport->tt.seq_send = fc_seq_send; | |
42e9a92f | 2478 | |
3a3b42bf RL |
2479 | if (!lport->tt.seq_els_rsp_send) |
2480 | lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
42e9a92f | 2481 | |
3a3b42bf RL |
2482 | if (!lport->tt.exch_done) |
2483 | lport->tt.exch_done = fc_exch_done; | |
42e9a92f | 2484 | |
3a3b42bf RL |
2485 | if (!lport->tt.exch_mgr_reset) |
2486 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
42e9a92f | 2487 | |
3a3b42bf RL |
2488 | if (!lport->tt.seq_exch_abort) |
2489 | lport->tt.seq_exch_abort = fc_seq_exch_abort; | |
42e9a92f | 2490 | |
239e8104 JE |
2491 | if (!lport->tt.seq_assign) |
2492 | lport->tt.seq_assign = fc_seq_assign; | |
2493 | ||
62bdb645 JE |
2494 | if (!lport->tt.seq_release) |
2495 | lport->tt.seq_release = fc_seq_release; | |
2496 | ||
89f19a59 VD |
2497 | return 0; |
2498 | } | |
2499 | EXPORT_SYMBOL(fc_exch_init); | |
2500 | ||
2501 | /** | |
2502 | * fc_setup_exch_mgr() - Setup an exchange manager | |
2503 | */ | |
55204909 | 2504 | int fc_setup_exch_mgr(void) |
89f19a59 VD |
2505 | { |
2506 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2507 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2508 | if (!fc_em_cachep) | |
2509 | return -ENOMEM; | |
2510 | ||
e4bc50be VD |
2511 | /* |
2512 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2513 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2514 | * to order of 2's * power and order is stored | |
2515 | * in fc_cpu_order as this is later required in | |
2516 | * mapping between an exch id and exch array index | |
2517 | * in per cpu exch pool. | |
2518 | * | |
2519 | * This round up is required to align fc_cpu_mask | |
2520 | * to exchange id's lower bits such that all incoming | |
2521 | * frames of an exchange gets delivered to the same | |
2522 | * cpu on which exchange originated by simple bitwise | |
2523 | * AND operation between fc_cpu_mask and exchange id. | |
2524 | */ | |
2525 | fc_cpu_mask = 1; | |
2526 | fc_cpu_order = 0; | |
2527 | while (fc_cpu_mask < nr_cpu_ids) { | |
2528 | fc_cpu_mask <<= 1; | |
2529 | fc_cpu_order++; | |
2530 | } | |
2531 | fc_cpu_mask--; | |
2532 | ||
4ae1e19f VD |
2533 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
2534 | if (!fc_exch_workqueue) | |
6f06e3a7 | 2535 | goto err; |
42e9a92f | 2536 | return 0; |
6f06e3a7 HD |
2537 | err: |
2538 | kmem_cache_destroy(fc_em_cachep); | |
2539 | return -ENOMEM; | |
42e9a92f | 2540 | } |
42e9a92f | 2541 | |
3a3b42bf RL |
2542 | /** |
2543 | * fc_destroy_exch_mgr() - Destroy an exchange manager | |
2544 | */ | |
55204909 | 2545 | void fc_destroy_exch_mgr(void) |
42e9a92f | 2546 | { |
4ae1e19f | 2547 | destroy_workqueue(fc_exch_workqueue); |
42e9a92f RL |
2548 | kmem_cache_destroy(fc_em_cachep); |
2549 | } |