]>
Commit | Line | Data |
---|---|---|
42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | |
3 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. | |
4 | * Copyright(c) 2008 Mike Christie | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | * | |
19 | * Maintained at www.Open-FCoE.org | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Fibre Channel exchange and sequence handling. | |
24 | */ | |
25 | ||
26 | #include <linux/timer.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
42e9a92f RL |
28 | #include <linux/err.h> |
29 | ||
30 | #include <scsi/fc/fc_fc2.h> | |
31 | ||
32 | #include <scsi/libfc.h> | |
33 | #include <scsi/fc_encode.h> | |
34 | ||
8866a5d9 RL |
35 | #include "fc_libfc.h" |
36 | ||
e4bc50be VD |
37 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
38 | EXPORT_SYMBOL(fc_cpu_mask); | |
39 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ | |
3a3b42bf | 40 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
4ae1e19f | 41 | struct workqueue_struct *fc_exch_workqueue; |
42e9a92f RL |
42 | |
43 | /* | |
44 | * Structure and function definitions for managing Fibre Channel Exchanges | |
45 | * and Sequences. | |
46 | * | |
47 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
48 | * | |
49 | * fc_exch_mgr holds the exchange state for an N port | |
50 | * | |
51 | * fc_exch holds state for one exchange and links to its active sequence. | |
52 | * | |
53 | * fc_seq holds the state for an individual sequence. | |
54 | */ | |
55 | ||
3a3b42bf RL |
56 | /** |
57 | * struct fc_exch_pool - Per cpu exchange pool | |
58 | * @next_index: Next possible free exchange index | |
59 | * @total_exches: Total allocated exchanges | |
60 | * @lock: Exch pool lock | |
61 | * @ex_list: List of exchanges | |
e4bc50be VD |
62 | * |
63 | * This structure manages per cpu exchanges in array of exchange pointers. | |
64 | * This array is allocated followed by struct fc_exch_pool memory for | |
65 | * assigned range of exchanges to per cpu pool. | |
66 | */ | |
67 | struct fc_exch_pool { | |
3a3b42bf RL |
68 | u16 next_index; |
69 | u16 total_exches; | |
70 | spinlock_t lock; | |
71 | struct list_head ex_list; | |
e4bc50be VD |
72 | }; |
73 | ||
3a3b42bf RL |
74 | /** |
75 | * struct fc_exch_mgr - The Exchange Manager (EM). | |
76 | * @class: Default class for new sequences | |
77 | * @kref: Reference counter | |
78 | * @min_xid: Minimum exchange ID | |
79 | * @max_xid: Maximum exchange ID | |
80 | * @ep_pool: Reserved exchange pointers | |
81 | * @pool_max_index: Max exch array index in exch pool | |
82 | * @pool: Per cpu exch pool | |
83 | * @stats: Statistics structure | |
42e9a92f RL |
84 | * |
85 | * This structure is the center for creating exchanges and sequences. | |
86 | * It manages the allocation of exchange IDs. | |
87 | */ | |
88 | struct fc_exch_mgr { | |
3a3b42bf RL |
89 | enum fc_class class; |
90 | struct kref kref; | |
91 | u16 min_xid; | |
92 | u16 max_xid; | |
93 | mempool_t *ep_pool; | |
94 | u16 pool_max_index; | |
95 | struct fc_exch_pool *pool; | |
42e9a92f RL |
96 | |
97 | /* | |
98 | * currently exchange mgr stats are updated but not used. | |
99 | * either stats can be expose via sysfs or remove them | |
100 | * all together if not used XXX | |
101 | */ | |
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 RL |
110 | }; |
111 | #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq) | |
112 | ||
3a3b42bf RL |
113 | /** |
114 | * struct fc_exch_mgr_anchor - primary structure for list of EMs | |
115 | * @ema_list: Exchange Manager Anchor list | |
116 | * @mp: Exchange Manager associated with this anchor | |
117 | * @match: Routine to determine if this anchor's EM should be used | |
118 | * | |
119 | * When walking the list of anchors the match routine will be called | |
120 | * for each anchor to determine if that EM should be used. The last | |
121 | * anchor in the list will always match to handle any exchanges not | |
122 | * handled by other EMs. The non-default EMs would be added to the | |
123 | * anchor list by HW that provides FCoE offloads. | |
124 | */ | |
96316099 VD |
125 | struct fc_exch_mgr_anchor { |
126 | struct list_head ema_list; | |
127 | struct fc_exch_mgr *mp; | |
128 | bool (*match)(struct fc_frame *); | |
129 | }; | |
130 | ||
42e9a92f RL |
131 | static void fc_exch_rrq(struct fc_exch *); |
132 | static void fc_seq_ls_acc(struct fc_seq *); | |
133 | static void fc_seq_ls_rjt(struct fc_seq *, enum fc_els_rjt_reason, | |
134 | enum fc_els_rjt_explan); | |
135 | static void fc_exch_els_rec(struct fc_seq *, struct fc_frame *); | |
136 | static void fc_exch_els_rrq(struct fc_seq *, struct fc_frame *); | |
42e9a92f RL |
137 | |
138 | /* | |
139 | * Internal implementation notes. | |
140 | * | |
141 | * The exchange manager is one by default in libfc but LLD may choose | |
142 | * to have one per CPU. The sequence manager is one per exchange manager | |
143 | * and currently never separated. | |
144 | * | |
145 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
146 | * assigned by the Sequence Initiator that shall be unique for a specific | |
147 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
148 | * qualified by exchange ID, which one might think it would be. | |
149 | * In practice this limits the number of open sequences and exchanges to 256 | |
150 | * per session. For most targets we could treat this limit as per exchange. | |
151 | * | |
152 | * The exchange and its sequence are freed when the last sequence is received. | |
153 | * It's possible for the remote port to leave an exchange open without | |
154 | * sending any sequences. | |
155 | * | |
156 | * Notes on reference counts: | |
157 | * | |
158 | * Exchanges are reference counted and exchange gets freed when the reference | |
159 | * count becomes zero. | |
160 | * | |
161 | * Timeouts: | |
162 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
163 | * | |
164 | * Sequence event handling: | |
165 | * | |
166 | * The following events may occur on initiator sequences: | |
167 | * | |
168 | * Send. | |
169 | * For now, the whole thing is sent. | |
170 | * Receive ACK | |
171 | * This applies only to class F. | |
172 | * The sequence is marked complete. | |
173 | * ULP completion. | |
174 | * The upper layer calls fc_exch_done() when done | |
175 | * with exchange and sequence tuple. | |
176 | * RX-inferred completion. | |
177 | * When we receive the next sequence on the same exchange, we can | |
178 | * retire the previous sequence ID. (XXX not implemented). | |
179 | * Timeout. | |
180 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
181 | * E_D_TOV causes abort and calls upper layer response handler | |
182 | * with FC_EX_TIMEOUT error. | |
183 | * Receive RJT | |
184 | * XXX defer. | |
185 | * Send ABTS | |
186 | * On timeout. | |
187 | * | |
188 | * The following events may occur on recipient sequences: | |
189 | * | |
190 | * Receive | |
191 | * Allocate sequence for first frame received. | |
192 | * Hold during receive handler. | |
193 | * Release when final frame received. | |
194 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
195 | * Receive ABTS | |
196 | * Deallocate sequence | |
197 | * Send RJT | |
198 | * Deallocate | |
199 | * | |
200 | * For now, we neglect conditions where only part of a sequence was | |
201 | * received or transmitted, or where out-of-order receipt is detected. | |
202 | */ | |
203 | ||
204 | /* | |
205 | * Locking notes: | |
206 | * | |
207 | * The EM code run in a per-CPU worker thread. | |
208 | * | |
209 | * To protect against concurrency between a worker thread code and timers, | |
210 | * sequence allocation and deallocation must be locked. | |
211 | * - exchange refcnt can be done atomicly without locks. | |
212 | * - sequence allocation must be locked by exch lock. | |
b2f0091f VD |
213 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
214 | * EM pool lock must be taken before the ex_lock. | |
42e9a92f RL |
215 | */ |
216 | ||
217 | /* | |
218 | * opcode names for debugging. | |
219 | */ | |
220 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
221 | ||
222 | #define FC_TABLE_SIZE(x) (sizeof(x) / sizeof(x[0])) | |
223 | ||
3a3b42bf RL |
224 | /** |
225 | * fc_exch_name_lookup() - Lookup name by opcode | |
226 | * @op: Opcode to be looked up | |
227 | * @table: Opcode/name table | |
228 | * @max_index: Index not to be exceeded | |
229 | * | |
230 | * This routine is used to determine a human-readable string identifying | |
231 | * a R_CTL opcode. | |
232 | */ | |
42e9a92f RL |
233 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
234 | unsigned int max_index) | |
235 | { | |
236 | const char *name = NULL; | |
237 | ||
238 | if (op < max_index) | |
239 | name = table[op]; | |
240 | if (!name) | |
241 | name = "unknown"; | |
242 | return name; | |
243 | } | |
244 | ||
3a3b42bf RL |
245 | /** |
246 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() | |
247 | * @op: The opcode to be looked up | |
248 | */ | |
42e9a92f RL |
249 | static const char *fc_exch_rctl_name(unsigned int op) |
250 | { | |
251 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
252 | FC_TABLE_SIZE(fc_exch_rctl_names)); | |
253 | } | |
254 | ||
3a3b42bf RL |
255 | /** |
256 | * fc_exch_hold() - Increment an exchange's reference count | |
257 | * @ep: Echange to be held | |
42e9a92f | 258 | */ |
3a3b42bf | 259 | static inline void fc_exch_hold(struct fc_exch *ep) |
42e9a92f RL |
260 | { |
261 | atomic_inc(&ep->ex_refcnt); | |
262 | } | |
263 | ||
3a3b42bf RL |
264 | /** |
265 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields | |
266 | * and determine SOF and EOF. | |
267 | * @ep: The exchange to that will use the header | |
268 | * @fp: The frame whose header is to be modified | |
269 | * @f_ctl: F_CTL bits that will be used for the frame header | |
270 | * | |
271 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, | |
272 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. | |
42e9a92f RL |
273 | */ |
274 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
275 | u32 f_ctl) | |
276 | { | |
277 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
278 | u16 fill; | |
279 | ||
280 | fr_sof(fp) = ep->class; | |
281 | if (ep->seq.cnt) | |
282 | fr_sof(fp) = fc_sof_normal(ep->class); | |
283 | ||
284 | if (f_ctl & FC_FC_END_SEQ) { | |
285 | fr_eof(fp) = FC_EOF_T; | |
286 | if (fc_sof_needs_ack(ep->class)) | |
287 | fr_eof(fp) = FC_EOF_N; | |
288 | /* | |
3a3b42bf | 289 | * From F_CTL. |
42e9a92f RL |
290 | * The number of fill bytes to make the length a 4-byte |
291 | * multiple is the low order 2-bits of the f_ctl. | |
292 | * The fill itself will have been cleared by the frame | |
293 | * allocation. | |
294 | * After this, the length will be even, as expected by | |
295 | * the transport. | |
296 | */ | |
297 | fill = fr_len(fp) & 3; | |
298 | if (fill) { | |
299 | fill = 4 - fill; | |
300 | /* TODO, this may be a problem with fragmented skb */ | |
301 | skb_put(fp_skb(fp), fill); | |
302 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
303 | } | |
304 | } else { | |
305 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
306 | fr_eof(fp) = FC_EOF_N; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Initialize remainig fh fields | |
311 | * from fc_fill_fc_hdr | |
312 | */ | |
313 | fh->fh_ox_id = htons(ep->oxid); | |
314 | fh->fh_rx_id = htons(ep->rxid); | |
315 | fh->fh_seq_id = ep->seq.id; | |
316 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
317 | } | |
318 | ||
3a3b42bf RL |
319 | /** |
320 | * fc_exch_release() - Decrement an exchange's reference count | |
321 | * @ep: Exchange to be released | |
322 | * | |
323 | * If the reference count reaches zero and the exchange is complete, | |
324 | * it is freed. | |
42e9a92f RL |
325 | */ |
326 | static void fc_exch_release(struct fc_exch *ep) | |
327 | { | |
328 | struct fc_exch_mgr *mp; | |
329 | ||
330 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
331 | mp = ep->em; | |
332 | if (ep->destructor) | |
333 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 334 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
335 | mempool_free(ep, mp->ep_pool); |
336 | } | |
337 | } | |
338 | ||
3a3b42bf RL |
339 | /** |
340 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held | |
341 | * @ep: The exchange that is complete | |
342 | */ | |
42e9a92f RL |
343 | static int fc_exch_done_locked(struct fc_exch *ep) |
344 | { | |
345 | int rc = 1; | |
346 | ||
347 | /* | |
348 | * We must check for completion in case there are two threads | |
349 | * tyring to complete this. But the rrq code will reuse the | |
350 | * ep, and in that case we only clear the resp and set it as | |
351 | * complete, so it can be reused by the timer to send the rrq. | |
352 | */ | |
353 | ep->resp = NULL; | |
354 | if (ep->state & FC_EX_DONE) | |
355 | return rc; | |
356 | ep->esb_stat |= ESB_ST_COMPLETE; | |
357 | ||
358 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
359 | ep->state |= FC_EX_DONE; | |
360 | if (cancel_delayed_work(&ep->timeout_work)) | |
361 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
362 | rc = 0; | |
363 | } | |
364 | return rc; | |
365 | } | |
366 | ||
3a3b42bf RL |
367 | /** |
368 | * fc_exch_ptr_get() - Return an exchange from an exchange pool | |
369 | * @pool: Exchange Pool to get an exchange from | |
370 | * @index: Index of the exchange within the pool | |
371 | * | |
372 | * Use the index to get an exchange from within an exchange pool. exches | |
373 | * will point to an array of exchange pointers. The index will select | |
374 | * the exchange within the array. | |
375 | */ | |
e4bc50be VD |
376 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
377 | u16 index) | |
378 | { | |
379 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); | |
380 | return exches[index]; | |
381 | } | |
382 | ||
3a3b42bf RL |
383 | /** |
384 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool | |
385 | * @pool: The pool to assign the exchange to | |
386 | * @index: The index in the pool where the exchange will be assigned | |
387 | * @ep: The exchange to assign to the pool | |
388 | */ | |
e4bc50be VD |
389 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, |
390 | struct fc_exch *ep) | |
391 | { | |
392 | ((struct fc_exch **)(pool + 1))[index] = ep; | |
393 | } | |
394 | ||
3a3b42bf RL |
395 | /** |
396 | * fc_exch_delete() - Delete an exchange | |
397 | * @ep: The exchange to be deleted | |
398 | */ | |
b2f0091f | 399 | static void fc_exch_delete(struct fc_exch *ep) |
42e9a92f | 400 | { |
b2f0091f | 401 | struct fc_exch_pool *pool; |
42e9a92f | 402 | |
b2f0091f VD |
403 | pool = ep->pool; |
404 | spin_lock_bh(&pool->lock); | |
405 | WARN_ON(pool->total_exches <= 0); | |
406 | pool->total_exches--; | |
407 | fc_exch_ptr_set(pool, (ep->xid - ep->em->min_xid) >> fc_cpu_order, | |
408 | NULL); | |
42e9a92f | 409 | list_del(&ep->ex_list); |
b2f0091f | 410 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
411 | fc_exch_release(ep); /* drop hold for exch in mp */ |
412 | } | |
413 | ||
3a3b42bf RL |
414 | /** |
415 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the | |
416 | * the exchange lock held | |
417 | * @ep: The exchange whose timer will start | |
418 | * @timer_msec: The timeout period | |
419 | * | |
420 | * Used for upper level protocols to time out the exchange. | |
421 | * The timer is cancelled when it fires or when the exchange completes. | |
42e9a92f RL |
422 | */ |
423 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
424 | unsigned int timer_msec) | |
425 | { | |
426 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
427 | return; | |
428 | ||
cd305ce4 | 429 | FC_EXCH_DBG(ep, "Exchange timer armed\n"); |
7414705e | 430 | |
4ae1e19f VD |
431 | if (queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, |
432 | msecs_to_jiffies(timer_msec))) | |
42e9a92f RL |
433 | fc_exch_hold(ep); /* hold for timer */ |
434 | } | |
435 | ||
3a3b42bf RL |
436 | /** |
437 | * fc_exch_timer_set() - Lock the exchange and set the timer | |
438 | * @ep: The exchange whose timer will start | |
439 | * @timer_msec: The timeout period | |
42e9a92f RL |
440 | */ |
441 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
442 | { | |
443 | spin_lock_bh(&ep->ex_lock); | |
444 | fc_exch_timer_set_locked(ep, timer_msec); | |
445 | spin_unlock_bh(&ep->ex_lock); | |
446 | } | |
447 | ||
1a7b75ae | 448 | /** |
3a3b42bf RL |
449 | * fc_seq_send() - Send a frame using existing sequence/exchange pair |
450 | * @lport: The local port that the exchange will be sent on | |
451 | * @sp: The sequence to be sent | |
452 | * @fp: The frame to be sent on the exchange | |
1a7b75ae | 453 | */ |
3a3b42bf | 454 | static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, |
1a7b75ae RL |
455 | struct fc_frame *fp) |
456 | { | |
457 | struct fc_exch *ep; | |
458 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
459 | int error; | |
3a3b42bf | 460 | u32 f_ctl; |
1a7b75ae RL |
461 | |
462 | ep = fc_seq_exch(sp); | |
463 | WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT); | |
464 | ||
465 | f_ctl = ntoh24(fh->fh_f_ctl); | |
466 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
467 | ||
468 | /* | |
469 | * update sequence count if this frame is carrying | |
470 | * multiple FC frames when sequence offload is enabled | |
471 | * by LLD. | |
472 | */ | |
473 | if (fr_max_payload(fp)) | |
474 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
475 | fr_max_payload(fp)); | |
476 | else | |
477 | sp->cnt++; | |
478 | ||
479 | /* | |
480 | * Send the frame. | |
481 | */ | |
3a3b42bf | 482 | error = lport->tt.frame_send(lport, fp); |
1a7b75ae RL |
483 | |
484 | /* | |
485 | * Update the exchange and sequence flags, | |
486 | * assuming all frames for the sequence have been sent. | |
487 | * We can only be called to send once for each sequence. | |
488 | */ | |
489 | spin_lock_bh(&ep->ex_lock); | |
490 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ | |
cc3593d3 | 491 | if (f_ctl & FC_FC_SEQ_INIT) |
1a7b75ae RL |
492 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
493 | spin_unlock_bh(&ep->ex_lock); | |
494 | return error; | |
495 | } | |
496 | ||
497 | /** | |
3a3b42bf RL |
498 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
499 | * @ep: The exchange to allocate a new sequence for | |
500 | * @seq_id: The sequence ID to be used | |
1a7b75ae RL |
501 | * |
502 | * We don't support multiple originated sequences on the same exchange. | |
503 | * By implication, any previously originated sequence on this exchange | |
504 | * is complete, and we reallocate the same sequence. | |
505 | */ | |
506 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
507 | { | |
508 | struct fc_seq *sp; | |
509 | ||
510 | sp = &ep->seq; | |
511 | sp->ssb_stat = 0; | |
512 | sp->cnt = 0; | |
513 | sp->id = seq_id; | |
514 | return sp; | |
515 | } | |
516 | ||
3a3b42bf RL |
517 | /** |
518 | * fc_seq_start_next_locked() - Allocate a new sequence on the same | |
519 | * exchange as the supplied sequence | |
520 | * @sp: The sequence/exchange to get a new sequence for | |
521 | */ | |
1a7b75ae RL |
522 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
523 | { | |
524 | struct fc_exch *ep = fc_seq_exch(sp); | |
525 | ||
526 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
527 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", | |
528 | ep->f_ctl, sp->id); | |
529 | return sp; | |
530 | } | |
531 | ||
532 | /** | |
3a3b42bf RL |
533 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
534 | * for a given sequence/exchange pair | |
535 | * @sp: The sequence/exchange to get a new exchange for | |
1a7b75ae RL |
536 | */ |
537 | static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
538 | { | |
539 | struct fc_exch *ep = fc_seq_exch(sp); | |
540 | ||
541 | spin_lock_bh(&ep->ex_lock); | |
542 | sp = fc_seq_start_next_locked(sp); | |
543 | spin_unlock_bh(&ep->ex_lock); | |
544 | ||
545 | return sp; | |
546 | } | |
547 | ||
548 | /** | |
3a3b42bf RL |
549 | * fc_seq_exch_abort() - Abort an exchange and sequence |
550 | * @req_sp: The sequence to be aborted | |
551 | * @timer_msec: The period of time to wait before aborting | |
552 | * | |
553 | * Generally called because of a timeout or an abort from the upper layer. | |
1a7b75ae RL |
554 | */ |
555 | static int fc_seq_exch_abort(const struct fc_seq *req_sp, | |
556 | unsigned int timer_msec) | |
42e9a92f RL |
557 | { |
558 | struct fc_seq *sp; | |
559 | struct fc_exch *ep; | |
560 | struct fc_frame *fp; | |
561 | int error; | |
562 | ||
563 | ep = fc_seq_exch(req_sp); | |
564 | ||
565 | spin_lock_bh(&ep->ex_lock); | |
566 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || | |
567 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) { | |
568 | spin_unlock_bh(&ep->ex_lock); | |
569 | return -ENXIO; | |
570 | } | |
571 | ||
572 | /* | |
573 | * Send the abort on a new sequence if possible. | |
574 | */ | |
575 | sp = fc_seq_start_next_locked(&ep->seq); | |
576 | if (!sp) { | |
577 | spin_unlock_bh(&ep->ex_lock); | |
578 | return -ENOMEM; | |
579 | } | |
580 | ||
581 | ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL; | |
582 | if (timer_msec) | |
583 | fc_exch_timer_set_locked(ep, timer_msec); | |
584 | spin_unlock_bh(&ep->ex_lock); | |
585 | ||
586 | /* | |
587 | * If not logged into the fabric, don't send ABTS but leave | |
588 | * sequence active until next timeout. | |
589 | */ | |
590 | if (!ep->sid) | |
591 | return 0; | |
592 | ||
593 | /* | |
594 | * Send an abort for the sequence that timed out. | |
595 | */ | |
596 | fp = fc_frame_alloc(ep->lp, 0); | |
597 | if (fp) { | |
598 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
599 | FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
600 | error = fc_seq_send(ep->lp, sp, fp); | |
601 | } else | |
602 | error = -ENOBUFS; | |
603 | return error; | |
604 | } | |
42e9a92f | 605 | |
3a3b42bf RL |
606 | /** |
607 | * fc_exch_timeout() - Handle exchange timer expiration | |
608 | * @work: The work_struct identifying the exchange that timed out | |
42e9a92f RL |
609 | */ |
610 | static void fc_exch_timeout(struct work_struct *work) | |
611 | { | |
612 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
613 | timeout_work.work); | |
614 | struct fc_seq *sp = &ep->seq; | |
615 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
616 | void *arg; | |
617 | u32 e_stat; | |
618 | int rc = 1; | |
619 | ||
cd305ce4 RL |
620 | FC_EXCH_DBG(ep, "Exchange timed out\n"); |
621 | ||
42e9a92f RL |
622 | spin_lock_bh(&ep->ex_lock); |
623 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
624 | goto unlock; | |
625 | ||
626 | e_stat = ep->esb_stat; | |
627 | if (e_stat & ESB_ST_COMPLETE) { | |
628 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 629 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
630 | if (e_stat & ESB_ST_REC_QUAL) |
631 | fc_exch_rrq(ep); | |
42e9a92f RL |
632 | goto done; |
633 | } else { | |
634 | resp = ep->resp; | |
635 | arg = ep->arg; | |
636 | ep->resp = NULL; | |
637 | if (e_stat & ESB_ST_ABNORMAL) | |
638 | rc = fc_exch_done_locked(ep); | |
639 | spin_unlock_bh(&ep->ex_lock); | |
640 | if (!rc) | |
b2f0091f | 641 | fc_exch_delete(ep); |
42e9a92f RL |
642 | if (resp) |
643 | resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg); | |
644 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); | |
645 | goto done; | |
646 | } | |
647 | unlock: | |
648 | spin_unlock_bh(&ep->ex_lock); | |
649 | done: | |
650 | /* | |
651 | * This release matches the hold taken when the timer was set. | |
652 | */ | |
653 | fc_exch_release(ep); | |
654 | } | |
655 | ||
52ff878c | 656 | /** |
3a3b42bf RL |
657 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
658 | * @lport: The local port that the exchange is for | |
659 | * @mp: The exchange manager that will allocate the exchange | |
42e9a92f | 660 | * |
d7179680 | 661 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 662 | */ |
52ff878c | 663 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 664 | struct fc_exch_mgr *mp) |
42e9a92f RL |
665 | { |
666 | struct fc_exch *ep; | |
b2f0091f VD |
667 | unsigned int cpu; |
668 | u16 index; | |
669 | struct fc_exch_pool *pool; | |
42e9a92f RL |
670 | |
671 | /* allocate memory for exchange */ | |
672 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
673 | if (!ep) { | |
674 | atomic_inc(&mp->stats.no_free_exch); | |
675 | goto out; | |
676 | } | |
677 | memset(ep, 0, sizeof(*ep)); | |
678 | ||
b2f0091f VD |
679 | cpu = smp_processor_id(); |
680 | pool = per_cpu_ptr(mp->pool, cpu); | |
681 | spin_lock_bh(&pool->lock); | |
682 | index = pool->next_index; | |
683 | /* allocate new exch from pool */ | |
684 | while (fc_exch_ptr_get(pool, index)) { | |
685 | index = index == mp->pool_max_index ? 0 : index + 1; | |
686 | if (index == pool->next_index) | |
42e9a92f | 687 | goto err; |
42e9a92f | 688 | } |
b2f0091f | 689 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
42e9a92f RL |
690 | |
691 | fc_exch_hold(ep); /* hold for exch in mp */ | |
692 | spin_lock_init(&ep->ex_lock); | |
693 | /* | |
694 | * Hold exch lock for caller to prevent fc_exch_reset() | |
695 | * from releasing exch while fc_exch_alloc() caller is | |
696 | * still working on exch. | |
697 | */ | |
698 | spin_lock_bh(&ep->ex_lock); | |
699 | ||
b2f0091f VD |
700 | fc_exch_ptr_set(pool, index, ep); |
701 | list_add_tail(&ep->ex_list, &pool->ex_list); | |
42e9a92f | 702 | fc_seq_alloc(ep, ep->seq_id++); |
b2f0091f VD |
703 | pool->total_exches++; |
704 | spin_unlock_bh(&pool->lock); | |
42e9a92f RL |
705 | |
706 | /* | |
707 | * update exchange | |
708 | */ | |
b2f0091f | 709 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
42e9a92f | 710 | ep->em = mp; |
b2f0091f | 711 | ep->pool = pool; |
52ff878c | 712 | ep->lp = lport; |
42e9a92f RL |
713 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
714 | ep->rxid = FC_XID_UNKNOWN; | |
715 | ep->class = mp->class; | |
716 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); | |
717 | out: | |
718 | return ep; | |
719 | err: | |
b2f0091f | 720 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
721 | atomic_inc(&mp->stats.no_free_exch_xid); |
722 | mempool_free(ep, mp->ep_pool); | |
723 | return NULL; | |
724 | } | |
52ff878c VD |
725 | |
726 | /** | |
3a3b42bf RL |
727 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
728 | * local port's list of EMs. | |
729 | * @lport: The local port that will own the exchange | |
730 | * @fp: The FC frame that the exchange will be for | |
52ff878c | 731 | * |
3a3b42bf RL |
732 | * This function walks the list of exchange manager(EM) |
733 | * anchors to select an EM for a new exchange allocation. The | |
734 | * EM is selected when a NULL match function pointer is encountered | |
735 | * or when a call to a match function returns true. | |
52ff878c | 736 | */ |
1a7b75ae RL |
737 | static struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
738 | struct fc_frame *fp) | |
52ff878c VD |
739 | { |
740 | struct fc_exch_mgr_anchor *ema; | |
741 | struct fc_exch *ep; | |
742 | ||
743 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
744 | if (!ema->match || ema->match(fp)) { | |
d7179680 | 745 | ep = fc_exch_em_alloc(lport, ema->mp); |
52ff878c VD |
746 | if (ep) |
747 | return ep; | |
748 | } | |
749 | } | |
750 | return NULL; | |
751 | } | |
42e9a92f | 752 | |
3a3b42bf RL |
753 | /** |
754 | * fc_exch_find() - Lookup and hold an exchange | |
755 | * @mp: The exchange manager to lookup the exchange from | |
756 | * @xid: The XID of the exchange to look up | |
42e9a92f RL |
757 | */ |
758 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
759 | { | |
b2f0091f | 760 | struct fc_exch_pool *pool; |
42e9a92f RL |
761 | struct fc_exch *ep = NULL; |
762 | ||
763 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
b2f0091f VD |
764 | pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask); |
765 | spin_lock_bh(&pool->lock); | |
766 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); | |
42e9a92f RL |
767 | if (ep) { |
768 | fc_exch_hold(ep); | |
769 | WARN_ON(ep->xid != xid); | |
770 | } | |
b2f0091f | 771 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
772 | } |
773 | return ep; | |
774 | } | |
775 | ||
1a7b75ae RL |
776 | |
777 | /** | |
778 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and | |
3a3b42bf RL |
779 | * the memory allocated for the related objects may be freed. |
780 | * @sp: The sequence that has completed | |
1a7b75ae RL |
781 | */ |
782 | static void fc_exch_done(struct fc_seq *sp) | |
42e9a92f RL |
783 | { |
784 | struct fc_exch *ep = fc_seq_exch(sp); | |
785 | int rc; | |
786 | ||
787 | spin_lock_bh(&ep->ex_lock); | |
788 | rc = fc_exch_done_locked(ep); | |
789 | spin_unlock_bh(&ep->ex_lock); | |
790 | if (!rc) | |
b2f0091f | 791 | fc_exch_delete(ep); |
42e9a92f | 792 | } |
42e9a92f | 793 | |
3a3b42bf RL |
794 | /** |
795 | * fc_exch_resp() - Allocate a new exchange for a response frame | |
796 | * @lport: The local port that the exchange was for | |
797 | * @mp: The exchange manager to allocate the exchange from | |
798 | * @fp: The response frame | |
799 | * | |
42e9a92f RL |
800 | * Sets the responder ID in the frame header. |
801 | */ | |
52ff878c VD |
802 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
803 | struct fc_exch_mgr *mp, | |
804 | struct fc_frame *fp) | |
42e9a92f RL |
805 | { |
806 | struct fc_exch *ep; | |
807 | struct fc_frame_header *fh; | |
42e9a92f | 808 | |
52ff878c | 809 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
810 | if (ep) { |
811 | ep->class = fc_frame_class(fp); | |
812 | ||
813 | /* | |
814 | * Set EX_CTX indicating we're responding on this exchange. | |
815 | */ | |
816 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
817 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
818 | fh = fc_frame_header_get(fp); | |
819 | ep->sid = ntoh24(fh->fh_d_id); | |
820 | ep->did = ntoh24(fh->fh_s_id); | |
821 | ep->oid = ep->did; | |
822 | ||
823 | /* | |
824 | * Allocated exchange has placed the XID in the | |
825 | * originator field. Move it to the responder field, | |
826 | * and set the originator XID from the frame. | |
827 | */ | |
828 | ep->rxid = ep->xid; | |
829 | ep->oxid = ntohs(fh->fh_ox_id); | |
830 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
831 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
832 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
833 | ||
42e9a92f | 834 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 835 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
836 | } |
837 | return ep; | |
838 | } | |
839 | ||
3a3b42bf RL |
840 | /** |
841 | * fc_seq_lookup_recip() - Find a sequence where the other end | |
842 | * originated the sequence | |
843 | * @lport: The local port that the frame was sent to | |
844 | * @mp: The Exchange Manager to lookup the exchange from | |
845 | * @fp: The frame associated with the sequence we're looking for | |
846 | * | |
42e9a92f RL |
847 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
848 | * on the ep that should be released by the caller. | |
849 | */ | |
52ff878c VD |
850 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
851 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 852 | struct fc_frame *fp) |
42e9a92f RL |
853 | { |
854 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
855 | struct fc_exch *ep = NULL; | |
856 | struct fc_seq *sp = NULL; | |
857 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
858 | u32 f_ctl; | |
859 | u16 xid; | |
860 | ||
861 | f_ctl = ntoh24(fh->fh_f_ctl); | |
862 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
863 | ||
864 | /* | |
865 | * Lookup or create the exchange if we will be creating the sequence. | |
866 | */ | |
867 | if (f_ctl & FC_FC_EX_CTX) { | |
868 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
869 | ep = fc_exch_find(mp, xid); | |
870 | if (!ep) { | |
871 | atomic_inc(&mp->stats.xid_not_found); | |
872 | reject = FC_RJT_OX_ID; | |
873 | goto out; | |
874 | } | |
875 | if (ep->rxid == FC_XID_UNKNOWN) | |
876 | ep->rxid = ntohs(fh->fh_rx_id); | |
877 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
878 | reject = FC_RJT_OX_ID; | |
879 | goto rel; | |
880 | } | |
881 | } else { | |
882 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
883 | ||
884 | /* | |
885 | * Special case for MDS issuing an ELS TEST with a | |
886 | * bad rxid of 0. | |
887 | * XXX take this out once we do the proper reject. | |
888 | */ | |
889 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
890 | fc_frame_payload_op(fp) == ELS_TEST) { | |
891 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
892 | xid = FC_XID_UNKNOWN; | |
893 | } | |
894 | ||
895 | /* | |
896 | * new sequence - find the exchange | |
897 | */ | |
898 | ep = fc_exch_find(mp, xid); | |
899 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
900 | if (ep) { | |
901 | atomic_inc(&mp->stats.xid_busy); | |
902 | reject = FC_RJT_RX_ID; | |
903 | goto rel; | |
904 | } | |
52ff878c | 905 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
906 | if (!ep) { |
907 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
908 | goto out; | |
909 | } | |
910 | xid = ep->xid; /* get our XID */ | |
911 | } else if (!ep) { | |
912 | atomic_inc(&mp->stats.xid_not_found); | |
913 | reject = FC_RJT_RX_ID; /* XID not found */ | |
914 | goto out; | |
915 | } | |
916 | } | |
917 | ||
918 | /* | |
919 | * At this point, we have the exchange held. | |
920 | * Find or create the sequence. | |
921 | */ | |
922 | if (fc_sof_is_init(fr_sof(fp))) { | |
923 | sp = fc_seq_start_next(&ep->seq); | |
924 | if (!sp) { | |
925 | reject = FC_RJT_SEQ_XS; /* exchange shortage */ | |
926 | goto rel; | |
927 | } | |
928 | sp->id = fh->fh_seq_id; | |
929 | sp->ssb_stat |= SSB_ST_RESP; | |
930 | } else { | |
931 | sp = &ep->seq; | |
932 | if (sp->id != fh->fh_seq_id) { | |
933 | atomic_inc(&mp->stats.seq_not_found); | |
934 | reject = FC_RJT_SEQ_ID; /* sequence/exch should exist */ | |
935 | goto rel; | |
936 | } | |
937 | } | |
938 | WARN_ON(ep != fc_seq_exch(sp)); | |
939 | ||
940 | if (f_ctl & FC_FC_SEQ_INIT) | |
941 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
942 | ||
943 | fr_seq(fp) = sp; | |
944 | out: | |
945 | return reject; | |
946 | rel: | |
947 | fc_exch_done(&ep->seq); | |
948 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
949 | return reject; | |
950 | } | |
951 | ||
3a3b42bf RL |
952 | /** |
953 | * fc_seq_lookup_orig() - Find a sequence where this end | |
954 | * originated the sequence | |
955 | * @mp: The Exchange Manager to lookup the exchange from | |
956 | * @fp: The frame associated with the sequence we're looking for | |
957 | * | |
42e9a92f RL |
958 | * Does not hold the sequence for the caller. |
959 | */ | |
960 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
961 | struct fc_frame *fp) | |
962 | { | |
963 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
964 | struct fc_exch *ep; | |
965 | struct fc_seq *sp = NULL; | |
966 | u32 f_ctl; | |
967 | u16 xid; | |
968 | ||
969 | f_ctl = ntoh24(fh->fh_f_ctl); | |
970 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
971 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
972 | ep = fc_exch_find(mp, xid); | |
973 | if (!ep) | |
974 | return NULL; | |
975 | if (ep->seq.id == fh->fh_seq_id) { | |
976 | /* | |
977 | * Save the RX_ID if we didn't previously know it. | |
978 | */ | |
979 | sp = &ep->seq; | |
980 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
981 | ep->rxid == FC_XID_UNKNOWN) { | |
982 | ep->rxid = ntohs(fh->fh_rx_id); | |
983 | } | |
984 | } | |
985 | fc_exch_release(ep); | |
986 | return sp; | |
987 | } | |
988 | ||
3a3b42bf RL |
989 | /** |
990 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange | |
991 | * @ep: The exchange to set the addresses for | |
992 | * @orig_id: The originator's ID | |
993 | * @resp_id: The responder's ID | |
994 | * | |
42e9a92f RL |
995 | * Note this must be done before the first sequence of the exchange is sent. |
996 | */ | |
997 | static void fc_exch_set_addr(struct fc_exch *ep, | |
998 | u32 orig_id, u32 resp_id) | |
999 | { | |
1000 | ep->oid = orig_id; | |
1001 | if (ep->esb_stat & ESB_ST_RESP) { | |
1002 | ep->sid = resp_id; | |
1003 | ep->did = orig_id; | |
1004 | } else { | |
1005 | ep->sid = orig_id; | |
1006 | ep->did = resp_id; | |
1007 | } | |
1008 | } | |
1009 | ||
1a7b75ae | 1010 | /** |
3a3b42bf RL |
1011 | * fc_seq_els_rsp_send() - Send an ELS response using infomation from |
1012 | * the existing sequence/exchange. | |
1013 | * @sp: The sequence/exchange to get information from | |
1014 | * @els_cmd: The ELS command to be sent | |
1015 | * @els_data: The ELS data to be sent | |
42e9a92f | 1016 | */ |
1a7b75ae RL |
1017 | static void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, |
1018 | struct fc_seq_els_data *els_data) | |
42e9a92f RL |
1019 | { |
1020 | switch (els_cmd) { | |
1021 | case ELS_LS_RJT: | |
1022 | fc_seq_ls_rjt(sp, els_data->reason, els_data->explan); | |
1023 | break; | |
1024 | case ELS_LS_ACC: | |
1025 | fc_seq_ls_acc(sp); | |
1026 | break; | |
1027 | case ELS_RRQ: | |
1028 | fc_exch_els_rrq(sp, els_data->fp); | |
1029 | break; | |
1030 | case ELS_REC: | |
1031 | fc_exch_els_rec(sp, els_data->fp); | |
1032 | break; | |
1033 | default: | |
7414705e | 1034 | FC_EXCH_DBG(fc_seq_exch(sp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
1035 | } |
1036 | } | |
42e9a92f | 1037 | |
3a3b42bf RL |
1038 | /** |
1039 | * fc_seq_send_last() - Send a sequence that is the last in the exchange | |
1040 | * @sp: The sequence that is to be sent | |
1041 | * @fp: The frame that will be sent on the sequence | |
1042 | * @rctl: The R_CTL information to be sent | |
1043 | * @fh_type: The frame header type | |
42e9a92f RL |
1044 | */ |
1045 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
1046 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
1047 | { | |
1048 | u32 f_ctl; | |
1049 | struct fc_exch *ep = fc_seq_exch(sp); | |
1050 | ||
1051 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1052 | f_ctl |= ep->f_ctl; | |
1053 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
1054 | fc_seq_send(ep->lp, sp, fp); | |
1055 | } | |
1056 | ||
3a3b42bf RL |
1057 | /** |
1058 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame | |
1059 | * @sp: The sequence to send the ACK on | |
1060 | * @rx_fp: The received frame that is being acknoledged | |
1061 | * | |
42e9a92f | 1062 | * Send ACK_1 (or equiv.) indicating we received something. |
42e9a92f RL |
1063 | */ |
1064 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
1065 | { | |
1066 | struct fc_frame *fp; | |
1067 | struct fc_frame_header *rx_fh; | |
1068 | struct fc_frame_header *fh; | |
1069 | struct fc_exch *ep = fc_seq_exch(sp); | |
3a3b42bf | 1070 | struct fc_lport *lport = ep->lp; |
42e9a92f RL |
1071 | unsigned int f_ctl; |
1072 | ||
1073 | /* | |
1074 | * Don't send ACKs for class 3. | |
1075 | */ | |
1076 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
3a3b42bf | 1077 | fp = fc_frame_alloc(lport, 0); |
42e9a92f RL |
1078 | if (!fp) |
1079 | return; | |
1080 | ||
1081 | fh = fc_frame_header_get(fp); | |
1082 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
1083 | fh->fh_type = FC_TYPE_BLS; | |
1084 | ||
1085 | /* | |
1086 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1087 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1088 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1089 | * Last ACK uses bits 7-6 (continue sequence), | |
1090 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1091 | */ | |
1092 | rx_fh = fc_frame_header_get(rx_fp); | |
1093 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1094 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1095 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
1096 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1097 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1098 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1099 | hton24(fh->fh_f_ctl, f_ctl); | |
1100 | ||
1101 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
1102 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
1103 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1104 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
1105 | ||
1106 | fr_sof(fp) = fr_sof(rx_fp); | |
1107 | if (f_ctl & FC_FC_END_SEQ) | |
1108 | fr_eof(fp) = FC_EOF_T; | |
1109 | else | |
1110 | fr_eof(fp) = FC_EOF_N; | |
1111 | ||
3a3b42bf | 1112 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1113 | } |
1114 | } | |
1115 | ||
3a3b42bf RL |
1116 | /** |
1117 | * fc_exch_send_ba_rjt() - Send BLS Reject | |
1118 | * @rx_fp: The frame being rejected | |
1119 | * @reason: The reason the frame is being rejected | |
1120 | * @explan: The explaination for the rejection | |
1121 | * | |
42e9a92f RL |
1122 | * This is for rejecting BA_ABTS only. |
1123 | */ | |
b2ab99c9 RL |
1124 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
1125 | enum fc_ba_rjt_reason reason, | |
1126 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
1127 | { |
1128 | struct fc_frame *fp; | |
1129 | struct fc_frame_header *rx_fh; | |
1130 | struct fc_frame_header *fh; | |
1131 | struct fc_ba_rjt *rp; | |
3a3b42bf | 1132 | struct fc_lport *lport; |
42e9a92f RL |
1133 | unsigned int f_ctl; |
1134 | ||
3a3b42bf RL |
1135 | lport = fr_dev(rx_fp); |
1136 | fp = fc_frame_alloc(lport, sizeof(*rp)); | |
42e9a92f RL |
1137 | if (!fp) |
1138 | return; | |
1139 | fh = fc_frame_header_get(fp); | |
1140 | rx_fh = fc_frame_header_get(rx_fp); | |
1141 | ||
1142 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1143 | ||
1144 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1145 | rp->br_reason = reason; | |
1146 | rp->br_explan = explan; | |
1147 | ||
1148 | /* | |
1149 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1150 | */ | |
1151 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1152 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1d490ce3 JE |
1153 | fh->fh_ox_id = rx_fh->fh_ox_id; |
1154 | fh->fh_rx_id = rx_fh->fh_rx_id; | |
42e9a92f RL |
1155 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
1156 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1157 | fh->fh_type = FC_TYPE_BLS; | |
1158 | ||
1159 | /* | |
1160 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1161 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1162 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1163 | * Last ACK uses bits 7-6 (continue sequence), | |
1164 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1165 | * Always set LAST_SEQ, END_SEQ. | |
1166 | */ | |
1167 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1168 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1169 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1170 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1171 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1172 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1173 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1174 | hton24(fh->fh_f_ctl, f_ctl); | |
1175 | ||
1176 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1177 | fr_eof(fp) = FC_EOF_T; | |
1178 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1179 | fr_eof(fp) = FC_EOF_N; | |
1180 | ||
3a3b42bf | 1181 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1182 | } |
1183 | ||
3a3b42bf RL |
1184 | /** |
1185 | * fc_exch_recv_abts() - Handle an incoming ABTS | |
1186 | * @ep: The exchange the abort was on | |
1187 | * @rx_fp: The ABTS frame | |
1188 | * | |
1189 | * This would be for target mode usually, but could be due to lost | |
1190 | * FCP transfer ready, confirm or RRQ. We always handle this as an | |
1191 | * exchange abort, ignoring the parameter. | |
42e9a92f RL |
1192 | */ |
1193 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1194 | { | |
1195 | struct fc_frame *fp; | |
1196 | struct fc_ba_acc *ap; | |
1197 | struct fc_frame_header *fh; | |
1198 | struct fc_seq *sp; | |
1199 | ||
1200 | if (!ep) | |
1201 | goto reject; | |
1202 | spin_lock_bh(&ep->ex_lock); | |
1203 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1204 | spin_unlock_bh(&ep->ex_lock); | |
1205 | goto reject; | |
1206 | } | |
1207 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) | |
1208 | fc_exch_hold(ep); /* hold for REC_QUAL */ | |
1209 | ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL; | |
1210 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1211 | ||
1212 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1213 | if (!fp) { | |
1214 | spin_unlock_bh(&ep->ex_lock); | |
1215 | goto free; | |
1216 | } | |
1217 | fh = fc_frame_header_get(fp); | |
1218 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1219 | memset(ap, 0, sizeof(*ap)); | |
1220 | sp = &ep->seq; | |
1221 | ap->ba_high_seq_cnt = htons(0xffff); | |
1222 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1223 | ap->ba_seq_id = sp->id; | |
1224 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1225 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1226 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1227 | } | |
a7e84f2b | 1228 | sp = fc_seq_start_next_locked(sp); |
42e9a92f RL |
1229 | spin_unlock_bh(&ep->ex_lock); |
1230 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); | |
1231 | fc_frame_free(rx_fp); | |
1232 | return; | |
1233 | ||
1234 | reject: | |
1235 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
1236 | free: | |
1237 | fc_frame_free(rx_fp); | |
1238 | } | |
1239 | ||
3a3b42bf RL |
1240 | /** |
1241 | * fc_exch_recv_req() - Handler for an incoming request where is other | |
1242 | * end is originating the sequence | |
1243 | * @lport: The local port that received the request | |
1244 | * @mp: The EM that the exchange is on | |
1245 | * @fp: The request frame | |
42e9a92f | 1246 | */ |
3a3b42bf | 1247 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
42e9a92f RL |
1248 | struct fc_frame *fp) |
1249 | { | |
1250 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1251 | struct fc_seq *sp = NULL; | |
1252 | struct fc_exch *ep = NULL; | |
1253 | enum fc_sof sof; | |
1254 | enum fc_eof eof; | |
1255 | u32 f_ctl; | |
1256 | enum fc_pf_rjt_reason reject; | |
1257 | ||
174e1ebf CL |
1258 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
1259 | * problem now that we know a new exchange needs to be allocated | |
1260 | */ | |
3a3b42bf RL |
1261 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
1262 | if (!lport) { | |
174e1ebf CL |
1263 | fc_frame_free(fp); |
1264 | return; | |
1265 | } | |
1266 | ||
42e9a92f | 1267 | fr_seq(fp) = NULL; |
3a3b42bf | 1268 | reject = fc_seq_lookup_recip(lport, mp, fp); |
42e9a92f RL |
1269 | if (reject == FC_RJT_NONE) { |
1270 | sp = fr_seq(fp); /* sequence will be held */ | |
1271 | ep = fc_seq_exch(sp); | |
1272 | sof = fr_sof(fp); | |
1273 | eof = fr_eof(fp); | |
1274 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1275 | fc_seq_send_ack(sp, fp); | |
1276 | ||
1277 | /* | |
1278 | * Call the receive function. | |
1279 | * | |
1280 | * The receive function may allocate a new sequence | |
1281 | * over the old one, so we shouldn't change the | |
1282 | * sequence after this. | |
1283 | * | |
1284 | * The frame will be freed by the receive function. | |
1285 | * If new exch resp handler is valid then call that | |
1286 | * first. | |
1287 | */ | |
1288 | if (ep->resp) | |
1289 | ep->resp(sp, fp, ep->arg); | |
1290 | else | |
3a3b42bf | 1291 | lport->tt.lport_recv(lport, sp, fp); |
42e9a92f RL |
1292 | fc_exch_release(ep); /* release from lookup */ |
1293 | } else { | |
3a3b42bf RL |
1294 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
1295 | reject); | |
42e9a92f RL |
1296 | fc_frame_free(fp); |
1297 | } | |
1298 | } | |
1299 | ||
3a3b42bf RL |
1300 | /** |
1301 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other | |
1302 | * end is the originator of the sequence that is a | |
1303 | * response to our initial exchange | |
1304 | * @mp: The EM that the exchange is on | |
1305 | * @fp: The response frame | |
42e9a92f RL |
1306 | */ |
1307 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1308 | { | |
1309 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1310 | struct fc_seq *sp; | |
1311 | struct fc_exch *ep; | |
1312 | enum fc_sof sof; | |
1313 | u32 f_ctl; | |
1314 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1315 | void *ex_resp_arg; | |
1316 | int rc; | |
1317 | ||
1318 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1319 | if (!ep) { | |
1320 | atomic_inc(&mp->stats.xid_not_found); | |
1321 | goto out; | |
1322 | } | |
30121d14 SM |
1323 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1324 | atomic_inc(&mp->stats.xid_not_found); | |
1325 | goto out; | |
1326 | } | |
42e9a92f RL |
1327 | if (ep->rxid == FC_XID_UNKNOWN) |
1328 | ep->rxid = ntohs(fh->fh_rx_id); | |
1329 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1330 | atomic_inc(&mp->stats.xid_not_found); | |
1331 | goto rel; | |
1332 | } | |
1333 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1334 | ep->did != FC_FID_FLOGI) { | |
1335 | atomic_inc(&mp->stats.xid_not_found); | |
1336 | goto rel; | |
1337 | } | |
1338 | sof = fr_sof(fp); | |
1339 | if (fc_sof_is_init(sof)) { | |
1340 | sp = fc_seq_start_next(&ep->seq); | |
1341 | sp->id = fh->fh_seq_id; | |
1342 | sp->ssb_stat |= SSB_ST_RESP; | |
1343 | } else { | |
1344 | sp = &ep->seq; | |
1345 | if (sp->id != fh->fh_seq_id) { | |
1346 | atomic_inc(&mp->stats.seq_not_found); | |
1347 | goto rel; | |
1348 | } | |
1349 | } | |
1350 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1351 | fr_seq(fp) = sp; | |
1352 | if (f_ctl & FC_FC_SEQ_INIT) | |
1353 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1354 | ||
1355 | if (fc_sof_needs_ack(sof)) | |
1356 | fc_seq_send_ack(sp, fp); | |
1357 | resp = ep->resp; | |
1358 | ex_resp_arg = ep->arg; | |
1359 | ||
1360 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1361 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1362 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1363 | spin_lock_bh(&ep->ex_lock); | |
1364 | rc = fc_exch_done_locked(ep); | |
1365 | WARN_ON(fc_seq_exch(sp) != ep); | |
1366 | spin_unlock_bh(&ep->ex_lock); | |
1367 | if (!rc) | |
b2f0091f | 1368 | fc_exch_delete(ep); |
42e9a92f RL |
1369 | } |
1370 | ||
1371 | /* | |
1372 | * Call the receive function. | |
1373 | * The sequence is held (has a refcnt) for us, | |
1374 | * but not for the receive function. | |
1375 | * | |
1376 | * The receive function may allocate a new sequence | |
1377 | * over the old one, so we shouldn't change the | |
1378 | * sequence after this. | |
1379 | * | |
1380 | * The frame will be freed by the receive function. | |
1381 | * If new exch resp handler is valid then call that | |
1382 | * first. | |
1383 | */ | |
1384 | if (resp) | |
1385 | resp(sp, fp, ex_resp_arg); | |
1386 | else | |
1387 | fc_frame_free(fp); | |
1388 | fc_exch_release(ep); | |
1389 | return; | |
1390 | rel: | |
1391 | fc_exch_release(ep); | |
1392 | out: | |
1393 | fc_frame_free(fp); | |
1394 | } | |
1395 | ||
3a3b42bf RL |
1396 | /** |
1397 | * fc_exch_recv_resp() - Handler for a sequence where other end is | |
1398 | * responding to our sequence | |
1399 | * @mp: The EM that the exchange is on | |
1400 | * @fp: The response frame | |
42e9a92f RL |
1401 | */ |
1402 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1403 | { | |
1404 | struct fc_seq *sp; | |
1405 | ||
1406 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1407 | |
1408 | if (!sp) | |
42e9a92f | 1409 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1410 | else |
42e9a92f | 1411 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1412 | |
42e9a92f RL |
1413 | fc_frame_free(fp); |
1414 | } | |
1415 | ||
3a3b42bf RL |
1416 | /** |
1417 | * fc_exch_abts_resp() - Handler for a response to an ABT | |
1418 | * @ep: The exchange that the frame is on | |
1419 | * @fp: The response frame | |
1420 | * | |
1421 | * This response would be to an ABTS cancelling an exchange or sequence. | |
1422 | * The response can be either BA_ACC or BA_RJT | |
42e9a92f RL |
1423 | */ |
1424 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1425 | { | |
1426 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1427 | void *ex_resp_arg; | |
1428 | struct fc_frame_header *fh; | |
1429 | struct fc_ba_acc *ap; | |
1430 | struct fc_seq *sp; | |
1431 | u16 low; | |
1432 | u16 high; | |
1433 | int rc = 1, has_rec = 0; | |
1434 | ||
1435 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1436 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1437 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1438 | |
1439 | if (cancel_delayed_work_sync(&ep->timeout_work)) | |
1440 | fc_exch_release(ep); /* release from pending timer hold */ | |
1441 | ||
1442 | spin_lock_bh(&ep->ex_lock); | |
1443 | switch (fh->fh_r_ctl) { | |
1444 | case FC_RCTL_BA_ACC: | |
1445 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1446 | if (!ap) | |
1447 | break; | |
1448 | ||
1449 | /* | |
1450 | * Decide whether to establish a Recovery Qualifier. | |
1451 | * We do this if there is a non-empty SEQ_CNT range and | |
1452 | * SEQ_ID is the same as the one we aborted. | |
1453 | */ | |
1454 | low = ntohs(ap->ba_low_seq_cnt); | |
1455 | high = ntohs(ap->ba_high_seq_cnt); | |
1456 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1457 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1458 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1459 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1460 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1461 | has_rec = 1; | |
1462 | } | |
1463 | break; | |
1464 | case FC_RCTL_BA_RJT: | |
1465 | break; | |
1466 | default: | |
1467 | break; | |
1468 | } | |
1469 | ||
1470 | resp = ep->resp; | |
1471 | ex_resp_arg = ep->arg; | |
1472 | ||
1473 | /* do we need to do some other checks here. Can we reuse more of | |
1474 | * fc_exch_recv_seq_resp | |
1475 | */ | |
1476 | sp = &ep->seq; | |
1477 | /* | |
1478 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1479 | */ | |
1480 | if (ep->fh_type != FC_TYPE_FCP && | |
1481 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1482 | rc = fc_exch_done_locked(ep); | |
1483 | spin_unlock_bh(&ep->ex_lock); | |
1484 | if (!rc) | |
b2f0091f | 1485 | fc_exch_delete(ep); |
42e9a92f RL |
1486 | |
1487 | if (resp) | |
1488 | resp(sp, fp, ex_resp_arg); | |
1489 | else | |
1490 | fc_frame_free(fp); | |
1491 | ||
1492 | if (has_rec) | |
1493 | fc_exch_timer_set(ep, ep->r_a_tov); | |
1494 | ||
1495 | } | |
1496 | ||
3a3b42bf RL |
1497 | /** |
1498 | * fc_exch_recv_bls() - Handler for a BLS sequence | |
1499 | * @mp: The EM that the exchange is on | |
1500 | * @fp: The request frame | |
1501 | * | |
1502 | * The BLS frame is always a sequence initiated by the remote side. | |
42e9a92f RL |
1503 | * We may be either the originator or recipient of the exchange. |
1504 | */ | |
1505 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1506 | { | |
1507 | struct fc_frame_header *fh; | |
1508 | struct fc_exch *ep; | |
1509 | u32 f_ctl; | |
1510 | ||
1511 | fh = fc_frame_header_get(fp); | |
1512 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1513 | fr_seq(fp) = NULL; | |
1514 | ||
1515 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1516 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1517 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1518 | spin_lock_bh(&ep->ex_lock); | |
1519 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1520 | spin_unlock_bh(&ep->ex_lock); | |
1521 | } | |
1522 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1523 | /* | |
1524 | * A response to a sequence we initiated. | |
1525 | * This should only be ACKs for class 2 or F. | |
1526 | */ | |
1527 | switch (fh->fh_r_ctl) { | |
1528 | case FC_RCTL_ACK_1: | |
1529 | case FC_RCTL_ACK_0: | |
1530 | break; | |
1531 | default: | |
7414705e RL |
1532 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received", |
1533 | fh->fh_r_ctl, | |
1534 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1535 | break; |
1536 | } | |
1537 | fc_frame_free(fp); | |
1538 | } else { | |
1539 | switch (fh->fh_r_ctl) { | |
1540 | case FC_RCTL_BA_RJT: | |
1541 | case FC_RCTL_BA_ACC: | |
1542 | if (ep) | |
1543 | fc_exch_abts_resp(ep, fp); | |
1544 | else | |
1545 | fc_frame_free(fp); | |
1546 | break; | |
1547 | case FC_RCTL_BA_ABTS: | |
1548 | fc_exch_recv_abts(ep, fp); | |
1549 | break; | |
1550 | default: /* ignore junk */ | |
1551 | fc_frame_free(fp); | |
1552 | break; | |
1553 | } | |
1554 | } | |
1555 | if (ep) | |
1556 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1557 | } | |
1558 | ||
3a3b42bf RL |
1559 | /** |
1560 | * fc_seq_ls_acc() - Accept sequence with LS_ACC | |
1561 | * @req_sp: The request sequence | |
1562 | * | |
42e9a92f RL |
1563 | * If this fails due to allocation or transmit congestion, assume the |
1564 | * originator will repeat the sequence. | |
1565 | */ | |
1566 | static void fc_seq_ls_acc(struct fc_seq *req_sp) | |
1567 | { | |
1568 | struct fc_seq *sp; | |
1569 | struct fc_els_ls_acc *acc; | |
1570 | struct fc_frame *fp; | |
1571 | ||
1572 | sp = fc_seq_start_next(req_sp); | |
1573 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc)); | |
1574 | if (fp) { | |
1575 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1576 | memset(acc, 0, sizeof(*acc)); | |
1577 | acc->la_cmd = ELS_LS_ACC; | |
1578 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1579 | } | |
1580 | } | |
1581 | ||
3a3b42bf RL |
1582 | /** |
1583 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT | |
1584 | * @req_sp: The request sequence | |
1585 | * @reason: The reason the sequence is being rejected | |
1586 | * @explan: The explaination for the rejection | |
1587 | * | |
42e9a92f RL |
1588 | * If this fails due to allocation or transmit congestion, assume the |
1589 | * originator will repeat the sequence. | |
1590 | */ | |
1591 | static void fc_seq_ls_rjt(struct fc_seq *req_sp, enum fc_els_rjt_reason reason, | |
1592 | enum fc_els_rjt_explan explan) | |
1593 | { | |
1594 | struct fc_seq *sp; | |
1595 | struct fc_els_ls_rjt *rjt; | |
1596 | struct fc_frame *fp; | |
1597 | ||
1598 | sp = fc_seq_start_next(req_sp); | |
1599 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*rjt)); | |
1600 | if (fp) { | |
1601 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1602 | memset(rjt, 0, sizeof(*rjt)); | |
1603 | rjt->er_cmd = ELS_LS_RJT; | |
1604 | rjt->er_reason = reason; | |
1605 | rjt->er_explan = explan; | |
1606 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1607 | } | |
1608 | } | |
1609 | ||
3a3b42bf RL |
1610 | /** |
1611 | * fc_exch_reset() - Reset an exchange | |
1612 | * @ep: The exchange to be reset | |
1613 | */ | |
42e9a92f RL |
1614 | static void fc_exch_reset(struct fc_exch *ep) |
1615 | { | |
1616 | struct fc_seq *sp; | |
1617 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
1618 | void *arg; | |
1619 | int rc = 1; | |
1620 | ||
1621 | spin_lock_bh(&ep->ex_lock); | |
1622 | ep->state |= FC_EX_RST_CLEANUP; | |
42e9a92f RL |
1623 | if (cancel_delayed_work(&ep->timeout_work)) |
1624 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
1625 | resp = ep->resp; | |
1626 | ep->resp = NULL; | |
1627 | if (ep->esb_stat & ESB_ST_REC_QUAL) | |
1628 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1629 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1630 | arg = ep->arg; | |
1631 | sp = &ep->seq; | |
1632 | rc = fc_exch_done_locked(ep); | |
1633 | spin_unlock_bh(&ep->ex_lock); | |
1634 | if (!rc) | |
b2f0091f | 1635 | fc_exch_delete(ep); |
42e9a92f RL |
1636 | |
1637 | if (resp) | |
1638 | resp(sp, ERR_PTR(-FC_EX_CLOSED), arg); | |
1639 | } | |
1640 | ||
b2f0091f | 1641 | /** |
3a3b42bf RL |
1642 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
1643 | * @lport: The local port that the exchange pool is on | |
1644 | * @pool: The exchange pool to be reset | |
1645 | * @sid: The source ID | |
1646 | * @did: The destination ID | |
b2f0091f | 1647 | * |
3a3b42bf RL |
1648 | * Resets a per cpu exches pool, releasing all of its sequences |
1649 | * and exchanges. If sid is non-zero then reset only exchanges | |
1650 | * we sourced from the local port's FID. If did is non-zero then | |
1651 | * only reset exchanges destined for the local port's FID. | |
42e9a92f | 1652 | */ |
b2f0091f VD |
1653 | static void fc_exch_pool_reset(struct fc_lport *lport, |
1654 | struct fc_exch_pool *pool, | |
1655 | u32 sid, u32 did) | |
42e9a92f RL |
1656 | { |
1657 | struct fc_exch *ep; | |
1658 | struct fc_exch *next; | |
1659 | ||
b2f0091f | 1660 | spin_lock_bh(&pool->lock); |
42e9a92f | 1661 | restart: |
b2f0091f VD |
1662 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
1663 | if ((lport == ep->lp) && | |
1664 | (sid == 0 || sid == ep->sid) && | |
1665 | (did == 0 || did == ep->did)) { | |
1666 | fc_exch_hold(ep); | |
1667 | spin_unlock_bh(&pool->lock); | |
1668 | ||
1669 | fc_exch_reset(ep); | |
1670 | ||
1671 | fc_exch_release(ep); | |
1672 | spin_lock_bh(&pool->lock); | |
1673 | ||
1674 | /* | |
1675 | * must restart loop incase while lock | |
1676 | * was down multiple eps were released. | |
1677 | */ | |
1678 | goto restart; | |
42e9a92f | 1679 | } |
b2f0091f VD |
1680 | } |
1681 | spin_unlock_bh(&pool->lock); | |
1682 | } | |
1683 | ||
1684 | /** | |
3a3b42bf RL |
1685 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
1686 | * @lport: The local port whose EMs are to be reset | |
1687 | * @sid: The source ID | |
1688 | * @did: The destination ID | |
b2f0091f | 1689 | * |
3a3b42bf RL |
1690 | * Reset all EMs associated with a given local port. Release all |
1691 | * sequences and exchanges. If sid is non-zero then reset only the | |
1692 | * exchanges sent from the local port's FID. If did is non-zero then | |
1693 | * reset only exchanges destined for the local port's FID. | |
b2f0091f VD |
1694 | */ |
1695 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) | |
1696 | { | |
1697 | struct fc_exch_mgr_anchor *ema; | |
1698 | unsigned int cpu; | |
1699 | ||
1700 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
1701 | for_each_possible_cpu(cpu) | |
1702 | fc_exch_pool_reset(lport, | |
1703 | per_cpu_ptr(ema->mp->pool, cpu), | |
1704 | sid, did); | |
42e9a92f | 1705 | } |
42e9a92f RL |
1706 | } |
1707 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1708 | ||
3a3b42bf RL |
1709 | /** |
1710 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests | |
1711 | * @sp: The sequence the REC is on | |
1712 | * @rfp: The REC frame | |
1713 | * | |
42e9a92f RL |
1714 | * Note that the requesting port may be different than the S_ID in the request. |
1715 | */ | |
1716 | static void fc_exch_els_rec(struct fc_seq *sp, struct fc_frame *rfp) | |
1717 | { | |
1718 | struct fc_frame *fp; | |
1719 | struct fc_exch *ep; | |
1720 | struct fc_exch_mgr *em; | |
1721 | struct fc_els_rec *rp; | |
1722 | struct fc_els_rec_acc *acc; | |
1723 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1724 | enum fc_els_rjt_explan explan; | |
1725 | u32 sid; | |
1726 | u16 rxid; | |
1727 | u16 oxid; | |
1728 | ||
1729 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); | |
1730 | explan = ELS_EXPL_INV_LEN; | |
1731 | if (!rp) | |
1732 | goto reject; | |
1733 | sid = ntoh24(rp->rec_s_id); | |
1734 | rxid = ntohs(rp->rec_rx_id); | |
1735 | oxid = ntohs(rp->rec_ox_id); | |
1736 | ||
1737 | /* | |
1738 | * Currently it's hard to find the local S_ID from the exchange | |
1739 | * manager. This will eventually be fixed, but for now it's easier | |
1740 | * to lookup the subject exchange twice, once as if we were | |
1741 | * the initiator, and then again if we weren't. | |
1742 | */ | |
1743 | em = fc_seq_exch(sp)->em; | |
1744 | ep = fc_exch_find(em, oxid); | |
1745 | explan = ELS_EXPL_OXID_RXID; | |
1746 | if (ep && ep->oid == sid) { | |
1747 | if (ep->rxid != FC_XID_UNKNOWN && | |
1748 | rxid != FC_XID_UNKNOWN && | |
1749 | ep->rxid != rxid) | |
1750 | goto rel; | |
1751 | } else { | |
1752 | if (ep) | |
1753 | fc_exch_release(ep); | |
1754 | ep = NULL; | |
1755 | if (rxid != FC_XID_UNKNOWN) | |
1756 | ep = fc_exch_find(em, rxid); | |
1757 | if (!ep) | |
1758 | goto reject; | |
1759 | } | |
1760 | ||
1761 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc)); | |
1762 | if (!fp) { | |
1763 | fc_exch_done(sp); | |
1764 | goto out; | |
1765 | } | |
1766 | sp = fc_seq_start_next(sp); | |
1767 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1768 | memset(acc, 0, sizeof(*acc)); | |
1769 | acc->reca_cmd = ELS_LS_ACC; | |
1770 | acc->reca_ox_id = rp->rec_ox_id; | |
1771 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1772 | acc->reca_rx_id = htons(ep->rxid); | |
1773 | if (ep->sid == ep->oid) | |
1774 | hton24(acc->reca_rfid, ep->did); | |
1775 | else | |
1776 | hton24(acc->reca_rfid, ep->sid); | |
1777 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1778 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1779 | ESB_ST_SEQ_INIT | | |
1780 | ESB_ST_COMPLETE)); | |
1781 | sp = fc_seq_start_next(sp); | |
1782 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1783 | out: | |
1784 | fc_exch_release(ep); | |
1785 | fc_frame_free(rfp); | |
1786 | return; | |
1787 | ||
1788 | rel: | |
1789 | fc_exch_release(ep); | |
1790 | reject: | |
1791 | fc_seq_ls_rjt(sp, reason, explan); | |
1792 | fc_frame_free(rfp); | |
1793 | } | |
1794 | ||
3a3b42bf RL |
1795 | /** |
1796 | * fc_exch_rrq_resp() - Handler for RRQ responses | |
1797 | * @sp: The sequence that the RRQ is on | |
1798 | * @fp: The RRQ frame | |
1799 | * @arg: The exchange that the RRQ is on | |
42e9a92f RL |
1800 | * |
1801 | * TODO: fix error handler. | |
1802 | */ | |
1803 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
1804 | { | |
1805 | struct fc_exch *aborted_ep = arg; | |
1806 | unsigned int op; | |
1807 | ||
1808 | if (IS_ERR(fp)) { | |
1809 | int err = PTR_ERR(fp); | |
1810 | ||
78342da3 | 1811 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 1812 | goto cleanup; |
7414705e RL |
1813 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
1814 | "frame error %d\n", err); | |
42e9a92f RL |
1815 | return; |
1816 | } | |
1817 | ||
1818 | op = fc_frame_payload_op(fp); | |
1819 | fc_frame_free(fp); | |
1820 | ||
1821 | switch (op) { | |
1822 | case ELS_LS_RJT: | |
7414705e | 1823 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ"); |
42e9a92f RL |
1824 | /* fall through */ |
1825 | case ELS_LS_ACC: | |
1826 | goto cleanup; | |
1827 | default: | |
7414705e RL |
1828 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x " |
1829 | "for RRQ", op); | |
42e9a92f RL |
1830 | return; |
1831 | } | |
1832 | ||
1833 | cleanup: | |
1834 | fc_exch_done(&aborted_ep->seq); | |
1835 | /* drop hold for rec qual */ | |
1836 | fc_exch_release(aborted_ep); | |
1837 | } | |
1838 | ||
1a7b75ae RL |
1839 | |
1840 | /** | |
3a3b42bf RL |
1841 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
1842 | * @lport: The local port to send the frame on | |
1843 | * @fp: The frame to be sent | |
1844 | * @resp: The response handler for this request | |
1845 | * @destructor: The destructor for the exchange | |
1846 | * @arg: The argument to be passed to the response handler | |
1847 | * @timer_msec: The timeout period for the exchange | |
1848 | * | |
1849 | * The frame pointer with some of the header's fields must be | |
1850 | * filled before calling this routine, those fields are: | |
1851 | * | |
1852 | * - routing control | |
1853 | * - FC port did | |
1854 | * - FC port sid | |
1855 | * - FC header type | |
1856 | * - frame control | |
1857 | * - parameter or relative offset | |
1a7b75ae | 1858 | */ |
3a3b42bf | 1859 | static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
1a7b75ae RL |
1860 | struct fc_frame *fp, |
1861 | void (*resp)(struct fc_seq *, | |
1862 | struct fc_frame *fp, | |
1863 | void *arg), | |
1864 | void (*destructor)(struct fc_seq *, | |
1865 | void *), | |
1866 | void *arg, u32 timer_msec) | |
1867 | { | |
1868 | struct fc_exch *ep; | |
1869 | struct fc_seq *sp = NULL; | |
1870 | struct fc_frame_header *fh; | |
1871 | int rc = 1; | |
1872 | ||
3a3b42bf | 1873 | ep = fc_exch_alloc(lport, fp); |
1a7b75ae RL |
1874 | if (!ep) { |
1875 | fc_frame_free(fp); | |
1876 | return NULL; | |
1877 | } | |
1878 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1879 | fh = fc_frame_header_get(fp); | |
1880 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
1881 | ep->resp = resp; | |
1882 | ep->destructor = destructor; | |
1883 | ep->arg = arg; | |
1884 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
3a3b42bf | 1885 | ep->lp = lport; |
1a7b75ae RL |
1886 | sp = &ep->seq; |
1887 | ||
1888 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
1889 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
1890 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
1891 | sp->cnt++; | |
1892 | ||
10897ae7 | 1893 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) |
1a7b75ae RL |
1894 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
1895 | ||
3a3b42bf | 1896 | if (unlikely(lport->tt.frame_send(lport, fp))) |
1a7b75ae RL |
1897 | goto err; |
1898 | ||
1899 | if (timer_msec) | |
1900 | fc_exch_timer_set_locked(ep, timer_msec); | |
1901 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
1902 | ||
1903 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
1904 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
1905 | spin_unlock_bh(&ep->ex_lock); | |
1906 | return sp; | |
1907 | err: | |
1908 | rc = fc_exch_done_locked(ep); | |
1909 | spin_unlock_bh(&ep->ex_lock); | |
1910 | if (!rc) | |
1911 | fc_exch_delete(ep); | |
1912 | return NULL; | |
1913 | } | |
1914 | ||
3a3b42bf RL |
1915 | /** |
1916 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command | |
1917 | * @ep: The exchange to send the RRQ on | |
1918 | * | |
42e9a92f RL |
1919 | * This tells the remote port to stop blocking the use of |
1920 | * the exchange and the seq_cnt range. | |
1921 | */ | |
1922 | static void fc_exch_rrq(struct fc_exch *ep) | |
1923 | { | |
3a3b42bf | 1924 | struct fc_lport *lport; |
42e9a92f RL |
1925 | struct fc_els_rrq *rrq; |
1926 | struct fc_frame *fp; | |
42e9a92f RL |
1927 | u32 did; |
1928 | ||
3a3b42bf | 1929 | lport = ep->lp; |
42e9a92f | 1930 | |
3a3b42bf | 1931 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
42e9a92f | 1932 | if (!fp) |
a0cc1ecc VD |
1933 | goto retry; |
1934 | ||
42e9a92f RL |
1935 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
1936 | memset(rrq, 0, sizeof(*rrq)); | |
1937 | rrq->rrq_cmd = ELS_RRQ; | |
1938 | hton24(rrq->rrq_s_id, ep->sid); | |
1939 | rrq->rrq_ox_id = htons(ep->oxid); | |
1940 | rrq->rrq_rx_id = htons(ep->rxid); | |
1941 | ||
1942 | did = ep->did; | |
1943 | if (ep->esb_stat & ESB_ST_RESP) | |
1944 | did = ep->sid; | |
1945 | ||
1946 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
3a3b42bf | 1947 | fc_host_port_id(lport->host), FC_TYPE_ELS, |
42e9a92f RL |
1948 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
1949 | ||
3a3b42bf RL |
1950 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
1951 | lport->e_d_tov)) | |
a0cc1ecc VD |
1952 | return; |
1953 | ||
1954 | retry: | |
1955 | spin_lock_bh(&ep->ex_lock); | |
1956 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
1957 | spin_unlock_bh(&ep->ex_lock); | |
1958 | /* drop hold for rec qual */ | |
1959 | fc_exch_release(ep); | |
42e9a92f RL |
1960 | return; |
1961 | } | |
a0cc1ecc VD |
1962 | ep->esb_stat |= ESB_ST_REC_QUAL; |
1963 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1964 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
1965 | } |
1966 | ||
1967 | ||
3a3b42bf RL |
1968 | /** |
1969 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests | |
1970 | * @sp: The sequence that the RRQ is on | |
1971 | * @fp: The RRQ frame | |
42e9a92f RL |
1972 | */ |
1973 | static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp) | |
1974 | { | |
3f127ad9 | 1975 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
42e9a92f RL |
1976 | struct fc_els_rrq *rp; |
1977 | u32 sid; | |
1978 | u16 xid; | |
1979 | enum fc_els_rjt_explan explan; | |
1980 | ||
1981 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1982 | explan = ELS_EXPL_INV_LEN; | |
1983 | if (!rp) | |
1984 | goto reject; | |
1985 | ||
1986 | /* | |
1987 | * lookup subject exchange. | |
1988 | */ | |
1989 | ep = fc_seq_exch(sp); | |
1990 | sid = ntoh24(rp->rrq_s_id); /* subject source */ | |
1991 | xid = ep->did == sid ? ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
1992 | ep = fc_exch_find(ep->em, xid); | |
1993 | ||
1994 | explan = ELS_EXPL_OXID_RXID; | |
1995 | if (!ep) | |
1996 | goto reject; | |
1997 | spin_lock_bh(&ep->ex_lock); | |
1998 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
1999 | goto unlock_reject; | |
2000 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
2001 | ep->rxid != FC_XID_UNKNOWN) | |
2002 | goto unlock_reject; | |
2003 | explan = ELS_EXPL_SID; | |
2004 | if (ep->sid != sid) | |
2005 | goto unlock_reject; | |
2006 | ||
2007 | /* | |
2008 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
2009 | */ | |
2010 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
2011 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
2012 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
2013 | } | |
2014 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
2015 | if (cancel_delayed_work(&ep->timeout_work)) | |
2016 | atomic_dec(&ep->ex_refcnt); /* drop timer hold */ | |
2017 | } | |
2018 | ||
2019 | spin_unlock_bh(&ep->ex_lock); | |
2020 | ||
2021 | /* | |
2022 | * Send LS_ACC. | |
2023 | */ | |
2024 | fc_seq_ls_acc(sp); | |
3f127ad9 | 2025 | goto out; |
42e9a92f RL |
2026 | |
2027 | unlock_reject: | |
2028 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
2029 | reject: |
2030 | fc_seq_ls_rjt(sp, ELS_RJT_LOGIC, explan); | |
3f127ad9 | 2031 | out: |
42e9a92f | 2032 | fc_frame_free(fp); |
3f127ad9 VD |
2033 | if (ep) |
2034 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
42e9a92f RL |
2035 | } |
2036 | ||
3a3b42bf RL |
2037 | /** |
2038 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs | |
2039 | * @lport: The local port to add the exchange manager to | |
2040 | * @mp: The exchange manager to be added to the local port | |
2041 | * @match: The match routine that indicates when this EM should be used | |
2042 | */ | |
96316099 VD |
2043 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
2044 | struct fc_exch_mgr *mp, | |
2045 | bool (*match)(struct fc_frame *)) | |
2046 | { | |
2047 | struct fc_exch_mgr_anchor *ema; | |
2048 | ||
2049 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
2050 | if (!ema) | |
2051 | return ema; | |
2052 | ||
2053 | ema->mp = mp; | |
2054 | ema->match = match; | |
2055 | /* add EM anchor to EM anchors list */ | |
2056 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
2057 | kref_get(&mp->kref); | |
2058 | return ema; | |
2059 | } | |
2060 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
2061 | ||
3a3b42bf RL |
2062 | /** |
2063 | * fc_exch_mgr_destroy() - Destroy an exchange manager | |
2064 | * @kref: The reference to the EM to be destroyed | |
2065 | */ | |
96316099 VD |
2066 | static void fc_exch_mgr_destroy(struct kref *kref) |
2067 | { | |
2068 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
2069 | ||
96316099 | 2070 | mempool_destroy(mp->ep_pool); |
e4bc50be | 2071 | free_percpu(mp->pool); |
96316099 VD |
2072 | kfree(mp); |
2073 | } | |
2074 | ||
3a3b42bf RL |
2075 | /** |
2076 | * fc_exch_mgr_del() - Delete an EM from a local port's list | |
2077 | * @ema: The exchange manager anchor identifying the EM to be deleted | |
2078 | */ | |
96316099 VD |
2079 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
2080 | { | |
2081 | /* remove EM anchor from EM anchors list */ | |
2082 | list_del(&ema->ema_list); | |
2083 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
2084 | kfree(ema); | |
2085 | } | |
2086 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
2087 | ||
174e1ebf | 2088 | /** |
3a3b42bf RL |
2089 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
2090 | * @src: Source lport to clone exchange managers from | |
2091 | * @dst: New lport that takes references to all the exchange managers | |
174e1ebf CL |
2092 | */ |
2093 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) | |
2094 | { | |
2095 | struct fc_exch_mgr_anchor *ema, *tmp; | |
2096 | ||
2097 | list_for_each_entry(ema, &src->ema_list, ema_list) { | |
2098 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) | |
2099 | goto err; | |
2100 | } | |
2101 | return 0; | |
2102 | err: | |
2103 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) | |
2104 | fc_exch_mgr_del(ema); | |
2105 | return -ENOMEM; | |
2106 | } | |
2107 | ||
3a3b42bf RL |
2108 | /** |
2109 | * fc_exch_mgr_alloc() - Allocate an exchange manager | |
2110 | * @lport: The local port that the new EM will be associated with | |
2111 | * @class: The default FC class for new exchanges | |
2112 | * @min_xid: The minimum XID for exchanges from the new EM | |
2113 | * @max_xid: The maximum XID for exchanges from the new EM | |
2114 | * @match: The match routine for the new EM | |
2115 | */ | |
2116 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, | |
42e9a92f | 2117 | enum fc_class class, |
52ff878c VD |
2118 | u16 min_xid, u16 max_xid, |
2119 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
2120 | { |
2121 | struct fc_exch_mgr *mp; | |
e4bc50be VD |
2122 | u16 pool_exch_range; |
2123 | size_t pool_size; | |
2124 | unsigned int cpu; | |
2125 | struct fc_exch_pool *pool; | |
42e9a92f | 2126 | |
e4bc50be VD |
2127 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
2128 | (min_xid & fc_cpu_mask) != 0) { | |
3a3b42bf | 2129 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
7414705e | 2130 | min_xid, max_xid); |
42e9a92f RL |
2131 | return NULL; |
2132 | } | |
2133 | ||
2134 | /* | |
b2f0091f | 2135 | * allocate memory for EM |
42e9a92f | 2136 | */ |
b2f0091f | 2137 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
42e9a92f RL |
2138 | if (!mp) |
2139 | return NULL; | |
2140 | ||
2141 | mp->class = class; | |
42e9a92f RL |
2142 | /* adjust em exch xid range for offload */ |
2143 | mp->min_xid = min_xid; | |
2144 | mp->max_xid = max_xid; | |
42e9a92f RL |
2145 | |
2146 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
2147 | if (!mp->ep_pool) | |
2148 | goto free_mp; | |
2149 | ||
e4bc50be VD |
2150 | /* |
2151 | * Setup per cpu exch pool with entire exchange id range equally | |
2152 | * divided across all cpus. The exch pointers array memory is | |
2153 | * allocated for exch range per pool. | |
2154 | */ | |
2155 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / (fc_cpu_mask + 1); | |
2156 | mp->pool_max_index = pool_exch_range - 1; | |
2157 | ||
2158 | /* | |
2159 | * Allocate and initialize per cpu exch pool | |
2160 | */ | |
2161 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
2162 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
2163 | if (!mp->pool) | |
2164 | goto free_mempool; | |
2165 | for_each_possible_cpu(cpu) { | |
2166 | pool = per_cpu_ptr(mp->pool, cpu); | |
2167 | spin_lock_init(&pool->lock); | |
2168 | INIT_LIST_HEAD(&pool->ex_list); | |
2169 | } | |
2170 | ||
52ff878c | 2171 | kref_init(&mp->kref); |
3a3b42bf | 2172 | if (!fc_exch_mgr_add(lport, mp, match)) { |
e4bc50be VD |
2173 | free_percpu(mp->pool); |
2174 | goto free_mempool; | |
52ff878c VD |
2175 | } |
2176 | ||
2177 | /* | |
2178 | * Above kref_init() sets mp->kref to 1 and then | |
2179 | * call to fc_exch_mgr_add incremented mp->kref again, | |
2180 | * so adjust that extra increment. | |
2181 | */ | |
2182 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
2183 | return mp; |
2184 | ||
e4bc50be VD |
2185 | free_mempool: |
2186 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
2187 | free_mp: |
2188 | kfree(mp); | |
2189 | return NULL; | |
2190 | } | |
2191 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
2192 | ||
3a3b42bf RL |
2193 | /** |
2194 | * fc_exch_mgr_free() - Free all exchange managers on a local port | |
2195 | * @lport: The local port whose EMs are to be freed | |
2196 | */ | |
52ff878c | 2197 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 2198 | { |
52ff878c VD |
2199 | struct fc_exch_mgr_anchor *ema, *next; |
2200 | ||
4ae1e19f | 2201 | flush_workqueue(fc_exch_workqueue); |
52ff878c VD |
2202 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
2203 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
2204 | } |
2205 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
2206 | ||
3a3b42bf RL |
2207 | /** |
2208 | * fc_exch_recv() - Handler for received frames | |
2209 | * @lport: The local port the frame was received on | |
2210 | * @fp: The received frame | |
42e9a92f | 2211 | */ |
3a3b42bf | 2212 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
2213 | { |
2214 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c VD |
2215 | struct fc_exch_mgr_anchor *ema; |
2216 | u32 f_ctl, found = 0; | |
2217 | u16 oxid; | |
42e9a92f RL |
2218 | |
2219 | /* lport lock ? */ | |
3a3b42bf RL |
2220 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
2221 | FC_LPORT_DBG(lport, "Receiving frames for an lport that " | |
7414705e | 2222 | "has not been initialized correctly\n"); |
42e9a92f RL |
2223 | fc_frame_free(fp); |
2224 | return; | |
2225 | } | |
2226 | ||
52ff878c VD |
2227 | f_ctl = ntoh24(fh->fh_f_ctl); |
2228 | oxid = ntohs(fh->fh_ox_id); | |
2229 | if (f_ctl & FC_FC_EX_CTX) { | |
3a3b42bf | 2230 | list_for_each_entry(ema, &lport->ema_list, ema_list) { |
52ff878c VD |
2231 | if ((oxid >= ema->mp->min_xid) && |
2232 | (oxid <= ema->mp->max_xid)) { | |
2233 | found = 1; | |
2234 | break; | |
2235 | } | |
2236 | } | |
2237 | ||
2238 | if (!found) { | |
3a3b42bf | 2239 | FC_LPORT_DBG(lport, "Received response for out " |
52ff878c VD |
2240 | "of range oxid:%hx\n", oxid); |
2241 | fc_frame_free(fp); | |
2242 | return; | |
2243 | } | |
2244 | } else | |
3a3b42bf | 2245 | ema = list_entry(lport->ema_list.prev, typeof(*ema), ema_list); |
52ff878c | 2246 | |
42e9a92f RL |
2247 | /* |
2248 | * If frame is marked invalid, just drop it. | |
2249 | */ | |
42e9a92f RL |
2250 | switch (fr_eof(fp)) { |
2251 | case FC_EOF_T: | |
2252 | if (f_ctl & FC_FC_END_SEQ) | |
2253 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
2254 | /* fall through */ | |
2255 | case FC_EOF_N: | |
2256 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2257 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2258 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2259 | FC_FC_EX_CTX) | |
52ff878c | 2260 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2261 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2262 | fc_exch_recv_resp(ema->mp, fp); |
42e9a92f | 2263 | else |
3a3b42bf | 2264 | fc_exch_recv_req(lport, ema->mp, fp); |
42e9a92f RL |
2265 | break; |
2266 | default: | |
3a3b42bf RL |
2267 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
2268 | fr_eof(fp)); | |
42e9a92f | 2269 | fc_frame_free(fp); |
42e9a92f RL |
2270 | } |
2271 | } | |
2272 | EXPORT_SYMBOL(fc_exch_recv); | |
2273 | ||
3a3b42bf RL |
2274 | /** |
2275 | * fc_exch_init() - Initialize the exchange layer for a local port | |
2276 | * @lport: The local port to initialize the exchange layer for | |
2277 | */ | |
2278 | int fc_exch_init(struct fc_lport *lport) | |
42e9a92f | 2279 | { |
3a3b42bf RL |
2280 | if (!lport->tt.seq_start_next) |
2281 | lport->tt.seq_start_next = fc_seq_start_next; | |
42e9a92f | 2282 | |
3a3b42bf RL |
2283 | if (!lport->tt.exch_seq_send) |
2284 | lport->tt.exch_seq_send = fc_exch_seq_send; | |
42e9a92f | 2285 | |
3a3b42bf RL |
2286 | if (!lport->tt.seq_send) |
2287 | lport->tt.seq_send = fc_seq_send; | |
42e9a92f | 2288 | |
3a3b42bf RL |
2289 | if (!lport->tt.seq_els_rsp_send) |
2290 | lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
42e9a92f | 2291 | |
3a3b42bf RL |
2292 | if (!lport->tt.exch_done) |
2293 | lport->tt.exch_done = fc_exch_done; | |
42e9a92f | 2294 | |
3a3b42bf RL |
2295 | if (!lport->tt.exch_mgr_reset) |
2296 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
42e9a92f | 2297 | |
3a3b42bf RL |
2298 | if (!lport->tt.seq_exch_abort) |
2299 | lport->tt.seq_exch_abort = fc_seq_exch_abort; | |
42e9a92f | 2300 | |
89f19a59 VD |
2301 | return 0; |
2302 | } | |
2303 | EXPORT_SYMBOL(fc_exch_init); | |
2304 | ||
2305 | /** | |
2306 | * fc_setup_exch_mgr() - Setup an exchange manager | |
2307 | */ | |
2308 | int fc_setup_exch_mgr() | |
2309 | { | |
2310 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2311 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2312 | if (!fc_em_cachep) | |
2313 | return -ENOMEM; | |
2314 | ||
e4bc50be VD |
2315 | /* |
2316 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2317 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2318 | * to order of 2's * power and order is stored | |
2319 | * in fc_cpu_order as this is later required in | |
2320 | * mapping between an exch id and exch array index | |
2321 | * in per cpu exch pool. | |
2322 | * | |
2323 | * This round up is required to align fc_cpu_mask | |
2324 | * to exchange id's lower bits such that all incoming | |
2325 | * frames of an exchange gets delivered to the same | |
2326 | * cpu on which exchange originated by simple bitwise | |
2327 | * AND operation between fc_cpu_mask and exchange id. | |
2328 | */ | |
2329 | fc_cpu_mask = 1; | |
2330 | fc_cpu_order = 0; | |
2331 | while (fc_cpu_mask < nr_cpu_ids) { | |
2332 | fc_cpu_mask <<= 1; | |
2333 | fc_cpu_order++; | |
2334 | } | |
2335 | fc_cpu_mask--; | |
2336 | ||
4ae1e19f VD |
2337 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
2338 | if (!fc_exch_workqueue) | |
2339 | return -ENOMEM; | |
42e9a92f RL |
2340 | return 0; |
2341 | } | |
42e9a92f | 2342 | |
3a3b42bf RL |
2343 | /** |
2344 | * fc_destroy_exch_mgr() - Destroy an exchange manager | |
2345 | */ | |
2346 | void fc_destroy_exch_mgr() | |
42e9a92f | 2347 | { |
4ae1e19f | 2348 | destroy_workqueue(fc_exch_workqueue); |
42e9a92f RL |
2349 | kmem_cache_destroy(fc_em_cachep); |
2350 | } |