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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> | |
27 | #include <linux/gfp.h> | |
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 | ||
7414705e | 35 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
42e9a92f RL |
36 | |
37 | /* | |
38 | * Structure and function definitions for managing Fibre Channel Exchanges | |
39 | * and Sequences. | |
40 | * | |
41 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
42 | * | |
43 | * fc_exch_mgr holds the exchange state for an N port | |
44 | * | |
45 | * fc_exch holds state for one exchange and links to its active sequence. | |
46 | * | |
47 | * fc_seq holds the state for an individual sequence. | |
48 | */ | |
49 | ||
50 | /* | |
51 | * Exchange manager. | |
52 | * | |
53 | * This structure is the center for creating exchanges and sequences. | |
54 | * It manages the allocation of exchange IDs. | |
55 | */ | |
56 | struct fc_exch_mgr { | |
57 | enum fc_class class; /* default class for sequences */ | |
96316099 | 58 | struct kref kref; /* exchange mgr reference count */ |
42e9a92f RL |
59 | spinlock_t em_lock; /* exchange manager lock, |
60 | must be taken before ex_lock */ | |
d7179680 | 61 | u16 next_xid; /* next possible free exchange ID */ |
42e9a92f RL |
62 | u16 min_xid; /* min exchange ID */ |
63 | u16 max_xid; /* max exchange ID */ | |
64 | u16 max_read; /* max exchange ID for read */ | |
65 | u16 last_read; /* last xid allocated for read */ | |
66 | u32 total_exches; /* total allocated exchanges */ | |
67 | struct list_head ex_list; /* allocated exchanges list */ | |
42e9a92f RL |
68 | mempool_t *ep_pool; /* reserve ep's */ |
69 | ||
70 | /* | |
71 | * currently exchange mgr stats are updated but not used. | |
72 | * either stats can be expose via sysfs or remove them | |
73 | * all together if not used XXX | |
74 | */ | |
75 | struct { | |
76 | atomic_t no_free_exch; | |
77 | atomic_t no_free_exch_xid; | |
78 | atomic_t xid_not_found; | |
79 | atomic_t xid_busy; | |
80 | atomic_t seq_not_found; | |
81 | atomic_t non_bls_resp; | |
82 | } stats; | |
83 | struct fc_exch **exches; /* for exch pointers indexed by xid */ | |
84 | }; | |
85 | #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq) | |
86 | ||
96316099 VD |
87 | struct fc_exch_mgr_anchor { |
88 | struct list_head ema_list; | |
89 | struct fc_exch_mgr *mp; | |
90 | bool (*match)(struct fc_frame *); | |
91 | }; | |
92 | ||
42e9a92f RL |
93 | static void fc_exch_rrq(struct fc_exch *); |
94 | static void fc_seq_ls_acc(struct fc_seq *); | |
95 | static void fc_seq_ls_rjt(struct fc_seq *, enum fc_els_rjt_reason, | |
96 | enum fc_els_rjt_explan); | |
97 | static void fc_exch_els_rec(struct fc_seq *, struct fc_frame *); | |
98 | static void fc_exch_els_rrq(struct fc_seq *, struct fc_frame *); | |
99 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp); | |
100 | ||
101 | /* | |
102 | * Internal implementation notes. | |
103 | * | |
104 | * The exchange manager is one by default in libfc but LLD may choose | |
105 | * to have one per CPU. The sequence manager is one per exchange manager | |
106 | * and currently never separated. | |
107 | * | |
108 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
109 | * assigned by the Sequence Initiator that shall be unique for a specific | |
110 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
111 | * qualified by exchange ID, which one might think it would be. | |
112 | * In practice this limits the number of open sequences and exchanges to 256 | |
113 | * per session. For most targets we could treat this limit as per exchange. | |
114 | * | |
115 | * The exchange and its sequence are freed when the last sequence is received. | |
116 | * It's possible for the remote port to leave an exchange open without | |
117 | * sending any sequences. | |
118 | * | |
119 | * Notes on reference counts: | |
120 | * | |
121 | * Exchanges are reference counted and exchange gets freed when the reference | |
122 | * count becomes zero. | |
123 | * | |
124 | * Timeouts: | |
125 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
126 | * | |
127 | * Sequence event handling: | |
128 | * | |
129 | * The following events may occur on initiator sequences: | |
130 | * | |
131 | * Send. | |
132 | * For now, the whole thing is sent. | |
133 | * Receive ACK | |
134 | * This applies only to class F. | |
135 | * The sequence is marked complete. | |
136 | * ULP completion. | |
137 | * The upper layer calls fc_exch_done() when done | |
138 | * with exchange and sequence tuple. | |
139 | * RX-inferred completion. | |
140 | * When we receive the next sequence on the same exchange, we can | |
141 | * retire the previous sequence ID. (XXX not implemented). | |
142 | * Timeout. | |
143 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
144 | * E_D_TOV causes abort and calls upper layer response handler | |
145 | * with FC_EX_TIMEOUT error. | |
146 | * Receive RJT | |
147 | * XXX defer. | |
148 | * Send ABTS | |
149 | * On timeout. | |
150 | * | |
151 | * The following events may occur on recipient sequences: | |
152 | * | |
153 | * Receive | |
154 | * Allocate sequence for first frame received. | |
155 | * Hold during receive handler. | |
156 | * Release when final frame received. | |
157 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
158 | * Receive ABTS | |
159 | * Deallocate sequence | |
160 | * Send RJT | |
161 | * Deallocate | |
162 | * | |
163 | * For now, we neglect conditions where only part of a sequence was | |
164 | * received or transmitted, or where out-of-order receipt is detected. | |
165 | */ | |
166 | ||
167 | /* | |
168 | * Locking notes: | |
169 | * | |
170 | * The EM code run in a per-CPU worker thread. | |
171 | * | |
172 | * To protect against concurrency between a worker thread code and timers, | |
173 | * sequence allocation and deallocation must be locked. | |
174 | * - exchange refcnt can be done atomicly without locks. | |
175 | * - sequence allocation must be locked by exch lock. | |
176 | * - If the em_lock and ex_lock must be taken at the same time, then the | |
177 | * em_lock must be taken before the ex_lock. | |
178 | */ | |
179 | ||
180 | /* | |
181 | * opcode names for debugging. | |
182 | */ | |
183 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
184 | ||
185 | #define FC_TABLE_SIZE(x) (sizeof(x) / sizeof(x[0])) | |
186 | ||
187 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, | |
188 | unsigned int max_index) | |
189 | { | |
190 | const char *name = NULL; | |
191 | ||
192 | if (op < max_index) | |
193 | name = table[op]; | |
194 | if (!name) | |
195 | name = "unknown"; | |
196 | return name; | |
197 | } | |
198 | ||
199 | static const char *fc_exch_rctl_name(unsigned int op) | |
200 | { | |
201 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
202 | FC_TABLE_SIZE(fc_exch_rctl_names)); | |
203 | } | |
204 | ||
205 | /* | |
206 | * Hold an exchange - keep it from being freed. | |
207 | */ | |
208 | static void fc_exch_hold(struct fc_exch *ep) | |
209 | { | |
210 | atomic_inc(&ep->ex_refcnt); | |
211 | } | |
212 | ||
213 | /* | |
214 | * setup fc hdr by initializing few more FC header fields and sof/eof. | |
215 | * Initialized fields by this func: | |
216 | * - fh_ox_id, fh_rx_id, fh_seq_id, fh_seq_cnt | |
217 | * - sof and eof | |
218 | */ | |
219 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
220 | u32 f_ctl) | |
221 | { | |
222 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
223 | u16 fill; | |
224 | ||
225 | fr_sof(fp) = ep->class; | |
226 | if (ep->seq.cnt) | |
227 | fr_sof(fp) = fc_sof_normal(ep->class); | |
228 | ||
229 | if (f_ctl & FC_FC_END_SEQ) { | |
230 | fr_eof(fp) = FC_EOF_T; | |
231 | if (fc_sof_needs_ack(ep->class)) | |
232 | fr_eof(fp) = FC_EOF_N; | |
233 | /* | |
234 | * Form f_ctl. | |
235 | * The number of fill bytes to make the length a 4-byte | |
236 | * multiple is the low order 2-bits of the f_ctl. | |
237 | * The fill itself will have been cleared by the frame | |
238 | * allocation. | |
239 | * After this, the length will be even, as expected by | |
240 | * the transport. | |
241 | */ | |
242 | fill = fr_len(fp) & 3; | |
243 | if (fill) { | |
244 | fill = 4 - fill; | |
245 | /* TODO, this may be a problem with fragmented skb */ | |
246 | skb_put(fp_skb(fp), fill); | |
247 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
248 | } | |
249 | } else { | |
250 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
251 | fr_eof(fp) = FC_EOF_N; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Initialize remainig fh fields | |
256 | * from fc_fill_fc_hdr | |
257 | */ | |
258 | fh->fh_ox_id = htons(ep->oxid); | |
259 | fh->fh_rx_id = htons(ep->rxid); | |
260 | fh->fh_seq_id = ep->seq.id; | |
261 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
262 | } | |
263 | ||
264 | ||
265 | /* | |
266 | * Release a reference to an exchange. | |
267 | * If the refcnt goes to zero and the exchange is complete, it is freed. | |
268 | */ | |
269 | static void fc_exch_release(struct fc_exch *ep) | |
270 | { | |
271 | struct fc_exch_mgr *mp; | |
272 | ||
273 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
274 | mp = ep->em; | |
275 | if (ep->destructor) | |
276 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 277 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
278 | mempool_free(ep, mp->ep_pool); |
279 | } | |
280 | } | |
281 | ||
282 | static int fc_exch_done_locked(struct fc_exch *ep) | |
283 | { | |
284 | int rc = 1; | |
285 | ||
286 | /* | |
287 | * We must check for completion in case there are two threads | |
288 | * tyring to complete this. But the rrq code will reuse the | |
289 | * ep, and in that case we only clear the resp and set it as | |
290 | * complete, so it can be reused by the timer to send the rrq. | |
291 | */ | |
292 | ep->resp = NULL; | |
293 | if (ep->state & FC_EX_DONE) | |
294 | return rc; | |
295 | ep->esb_stat |= ESB_ST_COMPLETE; | |
296 | ||
297 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
298 | ep->state |= FC_EX_DONE; | |
299 | if (cancel_delayed_work(&ep->timeout_work)) | |
300 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
301 | rc = 0; | |
302 | } | |
303 | return rc; | |
304 | } | |
305 | ||
306 | static void fc_exch_mgr_delete_ep(struct fc_exch *ep) | |
307 | { | |
308 | struct fc_exch_mgr *mp; | |
309 | ||
310 | mp = ep->em; | |
311 | spin_lock_bh(&mp->em_lock); | |
312 | WARN_ON(mp->total_exches <= 0); | |
313 | mp->total_exches--; | |
314 | mp->exches[ep->xid - mp->min_xid] = NULL; | |
315 | list_del(&ep->ex_list); | |
316 | spin_unlock_bh(&mp->em_lock); | |
317 | fc_exch_release(ep); /* drop hold for exch in mp */ | |
318 | } | |
319 | ||
320 | /* | |
321 | * Internal version of fc_exch_timer_set - used with lock held. | |
322 | */ | |
323 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
324 | unsigned int timer_msec) | |
325 | { | |
326 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
327 | return; | |
328 | ||
7414705e RL |
329 | FC_EXCH_DBG(ep, "Exchange timed out, notifying the upper layer\n"); |
330 | ||
42e9a92f RL |
331 | if (schedule_delayed_work(&ep->timeout_work, |
332 | msecs_to_jiffies(timer_msec))) | |
333 | fc_exch_hold(ep); /* hold for timer */ | |
334 | } | |
335 | ||
336 | /* | |
337 | * Set timer for an exchange. | |
338 | * The time is a minimum delay in milliseconds until the timer fires. | |
339 | * Used for upper level protocols to time out the exchange. | |
340 | * The timer is cancelled when it fires or when the exchange completes. | |
341 | * Returns non-zero if a timer couldn't be allocated. | |
342 | */ | |
343 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
344 | { | |
345 | spin_lock_bh(&ep->ex_lock); | |
346 | fc_exch_timer_set_locked(ep, timer_msec); | |
347 | spin_unlock_bh(&ep->ex_lock); | |
348 | } | |
349 | ||
350 | int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec) | |
351 | { | |
352 | struct fc_seq *sp; | |
353 | struct fc_exch *ep; | |
354 | struct fc_frame *fp; | |
355 | int error; | |
356 | ||
357 | ep = fc_seq_exch(req_sp); | |
358 | ||
359 | spin_lock_bh(&ep->ex_lock); | |
360 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || | |
361 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) { | |
362 | spin_unlock_bh(&ep->ex_lock); | |
363 | return -ENXIO; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Send the abort on a new sequence if possible. | |
368 | */ | |
369 | sp = fc_seq_start_next_locked(&ep->seq); | |
370 | if (!sp) { | |
371 | spin_unlock_bh(&ep->ex_lock); | |
372 | return -ENOMEM; | |
373 | } | |
374 | ||
375 | ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL; | |
376 | if (timer_msec) | |
377 | fc_exch_timer_set_locked(ep, timer_msec); | |
378 | spin_unlock_bh(&ep->ex_lock); | |
379 | ||
380 | /* | |
381 | * If not logged into the fabric, don't send ABTS but leave | |
382 | * sequence active until next timeout. | |
383 | */ | |
384 | if (!ep->sid) | |
385 | return 0; | |
386 | ||
387 | /* | |
388 | * Send an abort for the sequence that timed out. | |
389 | */ | |
390 | fp = fc_frame_alloc(ep->lp, 0); | |
391 | if (fp) { | |
392 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
393 | FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
394 | error = fc_seq_send(ep->lp, sp, fp); | |
395 | } else | |
396 | error = -ENOBUFS; | |
397 | return error; | |
398 | } | |
399 | EXPORT_SYMBOL(fc_seq_exch_abort); | |
400 | ||
401 | /* | |
402 | * Exchange timeout - handle exchange timer expiration. | |
403 | * The timer will have been cancelled before this is called. | |
404 | */ | |
405 | static void fc_exch_timeout(struct work_struct *work) | |
406 | { | |
407 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
408 | timeout_work.work); | |
409 | struct fc_seq *sp = &ep->seq; | |
410 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
411 | void *arg; | |
412 | u32 e_stat; | |
413 | int rc = 1; | |
414 | ||
415 | spin_lock_bh(&ep->ex_lock); | |
416 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
417 | goto unlock; | |
418 | ||
419 | e_stat = ep->esb_stat; | |
420 | if (e_stat & ESB_ST_COMPLETE) { | |
421 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 422 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
423 | if (e_stat & ESB_ST_REC_QUAL) |
424 | fc_exch_rrq(ep); | |
42e9a92f RL |
425 | goto done; |
426 | } else { | |
427 | resp = ep->resp; | |
428 | arg = ep->arg; | |
429 | ep->resp = NULL; | |
430 | if (e_stat & ESB_ST_ABNORMAL) | |
431 | rc = fc_exch_done_locked(ep); | |
432 | spin_unlock_bh(&ep->ex_lock); | |
433 | if (!rc) | |
434 | fc_exch_mgr_delete_ep(ep); | |
435 | if (resp) | |
436 | resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg); | |
437 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); | |
438 | goto done; | |
439 | } | |
440 | unlock: | |
441 | spin_unlock_bh(&ep->ex_lock); | |
442 | done: | |
443 | /* | |
444 | * This release matches the hold taken when the timer was set. | |
445 | */ | |
446 | fc_exch_release(ep); | |
447 | } | |
448 | ||
449 | /* | |
450 | * Allocate a sequence. | |
451 | * | |
452 | * We don't support multiple originated sequences on the same exchange. | |
453 | * By implication, any previously originated sequence on this exchange | |
454 | * is complete, and we reallocate the same sequence. | |
455 | */ | |
456 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
457 | { | |
458 | struct fc_seq *sp; | |
459 | ||
460 | sp = &ep->seq; | |
461 | sp->ssb_stat = 0; | |
462 | sp->cnt = 0; | |
463 | sp->id = seq_id; | |
464 | return sp; | |
465 | } | |
466 | ||
52ff878c VD |
467 | /** |
468 | * fc_exch_em_alloc() - allocate an exchange from a specified EM. | |
469 | * @lport: ptr to the local port | |
470 | * @mp: ptr to the exchange manager | |
42e9a92f | 471 | * |
d7179680 | 472 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 473 | */ |
52ff878c | 474 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 475 | struct fc_exch_mgr *mp) |
42e9a92f RL |
476 | { |
477 | struct fc_exch *ep; | |
d7179680 VD |
478 | u16 min, max, xid; |
479 | ||
480 | min = mp->min_xid; | |
481 | max = mp->max_xid; | |
42e9a92f RL |
482 | |
483 | /* allocate memory for exchange */ | |
484 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
485 | if (!ep) { | |
486 | atomic_inc(&mp->stats.no_free_exch); | |
487 | goto out; | |
488 | } | |
489 | memset(ep, 0, sizeof(*ep)); | |
490 | ||
491 | spin_lock_bh(&mp->em_lock); | |
d7179680 VD |
492 | xid = mp->next_xid; |
493 | /* alloc a new xid */ | |
494 | while (mp->exches[xid - min]) { | |
495 | xid = (xid == max) ? min : xid + 1; | |
496 | if (xid == mp->next_xid) | |
42e9a92f | 497 | goto err; |
42e9a92f | 498 | } |
d7179680 | 499 | mp->next_xid = (xid == max) ? min : xid + 1; |
42e9a92f RL |
500 | |
501 | fc_exch_hold(ep); /* hold for exch in mp */ | |
502 | spin_lock_init(&ep->ex_lock); | |
503 | /* | |
504 | * Hold exch lock for caller to prevent fc_exch_reset() | |
505 | * from releasing exch while fc_exch_alloc() caller is | |
506 | * still working on exch. | |
507 | */ | |
508 | spin_lock_bh(&ep->ex_lock); | |
509 | ||
510 | mp->exches[xid - mp->min_xid] = ep; | |
511 | list_add_tail(&ep->ex_list, &mp->ex_list); | |
512 | fc_seq_alloc(ep, ep->seq_id++); | |
513 | mp->total_exches++; | |
514 | spin_unlock_bh(&mp->em_lock); | |
515 | ||
516 | /* | |
517 | * update exchange | |
518 | */ | |
519 | ep->oxid = ep->xid = xid; | |
520 | ep->em = mp; | |
52ff878c | 521 | ep->lp = lport; |
42e9a92f RL |
522 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
523 | ep->rxid = FC_XID_UNKNOWN; | |
524 | ep->class = mp->class; | |
525 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); | |
526 | out: | |
527 | return ep; | |
528 | err: | |
529 | spin_unlock_bh(&mp->em_lock); | |
530 | atomic_inc(&mp->stats.no_free_exch_xid); | |
531 | mempool_free(ep, mp->ep_pool); | |
532 | return NULL; | |
533 | } | |
52ff878c VD |
534 | |
535 | /** | |
536 | * fc_exch_alloc() - allocate an exchange. | |
537 | * @lport: ptr to the local port | |
538 | * @fp: ptr to the FC frame | |
539 | * | |
540 | * This function walks the list of the exchange manager(EM) | |
541 | * anchors to select a EM for new exchange allocation. The | |
542 | * EM is selected having either a NULL match function pointer | |
543 | * or call to match function returning true. | |
544 | */ | |
545 | struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp) | |
546 | { | |
547 | struct fc_exch_mgr_anchor *ema; | |
548 | struct fc_exch *ep; | |
549 | ||
550 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
551 | if (!ema->match || ema->match(fp)) { | |
d7179680 | 552 | ep = fc_exch_em_alloc(lport, ema->mp); |
52ff878c VD |
553 | if (ep) |
554 | return ep; | |
555 | } | |
556 | } | |
557 | return NULL; | |
558 | } | |
42e9a92f RL |
559 | EXPORT_SYMBOL(fc_exch_alloc); |
560 | ||
561 | /* | |
562 | * Lookup and hold an exchange. | |
563 | */ | |
564 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
565 | { | |
566 | struct fc_exch *ep = NULL; | |
567 | ||
568 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
569 | spin_lock_bh(&mp->em_lock); | |
570 | ep = mp->exches[xid - mp->min_xid]; | |
571 | if (ep) { | |
572 | fc_exch_hold(ep); | |
573 | WARN_ON(ep->xid != xid); | |
574 | } | |
575 | spin_unlock_bh(&mp->em_lock); | |
576 | } | |
577 | return ep; | |
578 | } | |
579 | ||
580 | void fc_exch_done(struct fc_seq *sp) | |
581 | { | |
582 | struct fc_exch *ep = fc_seq_exch(sp); | |
583 | int rc; | |
584 | ||
585 | spin_lock_bh(&ep->ex_lock); | |
586 | rc = fc_exch_done_locked(ep); | |
587 | spin_unlock_bh(&ep->ex_lock); | |
588 | if (!rc) | |
589 | fc_exch_mgr_delete_ep(ep); | |
590 | } | |
591 | EXPORT_SYMBOL(fc_exch_done); | |
592 | ||
593 | /* | |
594 | * Allocate a new exchange as responder. | |
595 | * Sets the responder ID in the frame header. | |
596 | */ | |
52ff878c VD |
597 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
598 | struct fc_exch_mgr *mp, | |
599 | struct fc_frame *fp) | |
42e9a92f RL |
600 | { |
601 | struct fc_exch *ep; | |
602 | struct fc_frame_header *fh; | |
42e9a92f | 603 | |
52ff878c | 604 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
605 | if (ep) { |
606 | ep->class = fc_frame_class(fp); | |
607 | ||
608 | /* | |
609 | * Set EX_CTX indicating we're responding on this exchange. | |
610 | */ | |
611 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
612 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
613 | fh = fc_frame_header_get(fp); | |
614 | ep->sid = ntoh24(fh->fh_d_id); | |
615 | ep->did = ntoh24(fh->fh_s_id); | |
616 | ep->oid = ep->did; | |
617 | ||
618 | /* | |
619 | * Allocated exchange has placed the XID in the | |
620 | * originator field. Move it to the responder field, | |
621 | * and set the originator XID from the frame. | |
622 | */ | |
623 | ep->rxid = ep->xid; | |
624 | ep->oxid = ntohs(fh->fh_ox_id); | |
625 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
626 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
627 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
628 | ||
42e9a92f | 629 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 630 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
631 | } |
632 | return ep; | |
633 | } | |
634 | ||
635 | /* | |
636 | * Find a sequence for receive where the other end is originating the sequence. | |
637 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold | |
638 | * on the ep that should be released by the caller. | |
639 | */ | |
52ff878c VD |
640 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
641 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 642 | struct fc_frame *fp) |
42e9a92f RL |
643 | { |
644 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
645 | struct fc_exch *ep = NULL; | |
646 | struct fc_seq *sp = NULL; | |
647 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
648 | u32 f_ctl; | |
649 | u16 xid; | |
650 | ||
651 | f_ctl = ntoh24(fh->fh_f_ctl); | |
652 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
653 | ||
654 | /* | |
655 | * Lookup or create the exchange if we will be creating the sequence. | |
656 | */ | |
657 | if (f_ctl & FC_FC_EX_CTX) { | |
658 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
659 | ep = fc_exch_find(mp, xid); | |
660 | if (!ep) { | |
661 | atomic_inc(&mp->stats.xid_not_found); | |
662 | reject = FC_RJT_OX_ID; | |
663 | goto out; | |
664 | } | |
665 | if (ep->rxid == FC_XID_UNKNOWN) | |
666 | ep->rxid = ntohs(fh->fh_rx_id); | |
667 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
668 | reject = FC_RJT_OX_ID; | |
669 | goto rel; | |
670 | } | |
671 | } else { | |
672 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
673 | ||
674 | /* | |
675 | * Special case for MDS issuing an ELS TEST with a | |
676 | * bad rxid of 0. | |
677 | * XXX take this out once we do the proper reject. | |
678 | */ | |
679 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
680 | fc_frame_payload_op(fp) == ELS_TEST) { | |
681 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
682 | xid = FC_XID_UNKNOWN; | |
683 | } | |
684 | ||
685 | /* | |
686 | * new sequence - find the exchange | |
687 | */ | |
688 | ep = fc_exch_find(mp, xid); | |
689 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
690 | if (ep) { | |
691 | atomic_inc(&mp->stats.xid_busy); | |
692 | reject = FC_RJT_RX_ID; | |
693 | goto rel; | |
694 | } | |
52ff878c | 695 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
696 | if (!ep) { |
697 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
698 | goto out; | |
699 | } | |
700 | xid = ep->xid; /* get our XID */ | |
701 | } else if (!ep) { | |
702 | atomic_inc(&mp->stats.xid_not_found); | |
703 | reject = FC_RJT_RX_ID; /* XID not found */ | |
704 | goto out; | |
705 | } | |
706 | } | |
707 | ||
708 | /* | |
709 | * At this point, we have the exchange held. | |
710 | * Find or create the sequence. | |
711 | */ | |
712 | if (fc_sof_is_init(fr_sof(fp))) { | |
713 | sp = fc_seq_start_next(&ep->seq); | |
714 | if (!sp) { | |
715 | reject = FC_RJT_SEQ_XS; /* exchange shortage */ | |
716 | goto rel; | |
717 | } | |
718 | sp->id = fh->fh_seq_id; | |
719 | sp->ssb_stat |= SSB_ST_RESP; | |
720 | } else { | |
721 | sp = &ep->seq; | |
722 | if (sp->id != fh->fh_seq_id) { | |
723 | atomic_inc(&mp->stats.seq_not_found); | |
724 | reject = FC_RJT_SEQ_ID; /* sequence/exch should exist */ | |
725 | goto rel; | |
726 | } | |
727 | } | |
728 | WARN_ON(ep != fc_seq_exch(sp)); | |
729 | ||
730 | if (f_ctl & FC_FC_SEQ_INIT) | |
731 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
732 | ||
733 | fr_seq(fp) = sp; | |
734 | out: | |
735 | return reject; | |
736 | rel: | |
737 | fc_exch_done(&ep->seq); | |
738 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
739 | return reject; | |
740 | } | |
741 | ||
742 | /* | |
743 | * Find the sequence for a frame being received. | |
744 | * We originated the sequence, so it should be found. | |
745 | * We may or may not have originated the exchange. | |
746 | * Does not hold the sequence for the caller. | |
747 | */ | |
748 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
749 | struct fc_frame *fp) | |
750 | { | |
751 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
752 | struct fc_exch *ep; | |
753 | struct fc_seq *sp = NULL; | |
754 | u32 f_ctl; | |
755 | u16 xid; | |
756 | ||
757 | f_ctl = ntoh24(fh->fh_f_ctl); | |
758 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
759 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
760 | ep = fc_exch_find(mp, xid); | |
761 | if (!ep) | |
762 | return NULL; | |
763 | if (ep->seq.id == fh->fh_seq_id) { | |
764 | /* | |
765 | * Save the RX_ID if we didn't previously know it. | |
766 | */ | |
767 | sp = &ep->seq; | |
768 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
769 | ep->rxid == FC_XID_UNKNOWN) { | |
770 | ep->rxid = ntohs(fh->fh_rx_id); | |
771 | } | |
772 | } | |
773 | fc_exch_release(ep); | |
774 | return sp; | |
775 | } | |
776 | ||
777 | /* | |
778 | * Set addresses for an exchange. | |
779 | * Note this must be done before the first sequence of the exchange is sent. | |
780 | */ | |
781 | static void fc_exch_set_addr(struct fc_exch *ep, | |
782 | u32 orig_id, u32 resp_id) | |
783 | { | |
784 | ep->oid = orig_id; | |
785 | if (ep->esb_stat & ESB_ST_RESP) { | |
786 | ep->sid = resp_id; | |
787 | ep->did = orig_id; | |
788 | } else { | |
789 | ep->sid = orig_id; | |
790 | ep->did = resp_id; | |
791 | } | |
792 | } | |
793 | ||
794 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) | |
795 | { | |
796 | struct fc_exch *ep = fc_seq_exch(sp); | |
797 | ||
798 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
7414705e RL |
799 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", |
800 | ep->f_ctl, sp->id); | |
42e9a92f RL |
801 | return sp; |
802 | } | |
803 | /* | |
804 | * Allocate a new sequence on the same exchange as the supplied sequence. | |
805 | * This will never return NULL. | |
806 | */ | |
807 | struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
808 | { | |
809 | struct fc_exch *ep = fc_seq_exch(sp); | |
810 | ||
811 | spin_lock_bh(&ep->ex_lock); | |
42e9a92f RL |
812 | sp = fc_seq_start_next_locked(sp); |
813 | spin_unlock_bh(&ep->ex_lock); | |
814 | ||
815 | return sp; | |
816 | } | |
817 | EXPORT_SYMBOL(fc_seq_start_next); | |
818 | ||
819 | int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp) | |
820 | { | |
821 | struct fc_exch *ep; | |
822 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
823 | int error; | |
824 | u32 f_ctl; | |
825 | ||
826 | ep = fc_seq_exch(sp); | |
827 | WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT); | |
828 | ||
829 | f_ctl = ntoh24(fh->fh_f_ctl); | |
830 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
831 | ||
832 | /* | |
833 | * update sequence count if this frame is carrying | |
834 | * multiple FC frames when sequence offload is enabled | |
835 | * by LLD. | |
836 | */ | |
837 | if (fr_max_payload(fp)) | |
838 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
839 | fr_max_payload(fp)); | |
840 | else | |
841 | sp->cnt++; | |
842 | ||
843 | /* | |
844 | * Send the frame. | |
845 | */ | |
846 | error = lp->tt.frame_send(lp, fp); | |
847 | ||
848 | /* | |
849 | * Update the exchange and sequence flags, | |
850 | * assuming all frames for the sequence have been sent. | |
851 | * We can only be called to send once for each sequence. | |
852 | */ | |
853 | spin_lock_bh(&ep->ex_lock); | |
854 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ | |
855 | if (f_ctl & (FC_FC_END_SEQ | FC_FC_SEQ_INIT)) | |
856 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
857 | spin_unlock_bh(&ep->ex_lock); | |
858 | return error; | |
859 | } | |
860 | EXPORT_SYMBOL(fc_seq_send); | |
861 | ||
862 | void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, | |
863 | struct fc_seq_els_data *els_data) | |
864 | { | |
865 | switch (els_cmd) { | |
866 | case ELS_LS_RJT: | |
867 | fc_seq_ls_rjt(sp, els_data->reason, els_data->explan); | |
868 | break; | |
869 | case ELS_LS_ACC: | |
870 | fc_seq_ls_acc(sp); | |
871 | break; | |
872 | case ELS_RRQ: | |
873 | fc_exch_els_rrq(sp, els_data->fp); | |
874 | break; | |
875 | case ELS_REC: | |
876 | fc_exch_els_rec(sp, els_data->fp); | |
877 | break; | |
878 | default: | |
7414705e | 879 | FC_EXCH_DBG(fc_seq_exch(sp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
880 | } |
881 | } | |
882 | EXPORT_SYMBOL(fc_seq_els_rsp_send); | |
883 | ||
884 | /* | |
885 | * Send a sequence, which is also the last sequence in the exchange. | |
886 | */ | |
887 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
888 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
889 | { | |
890 | u32 f_ctl; | |
891 | struct fc_exch *ep = fc_seq_exch(sp); | |
892 | ||
893 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
894 | f_ctl |= ep->f_ctl; | |
895 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
896 | fc_seq_send(ep->lp, sp, fp); | |
897 | } | |
898 | ||
899 | /* | |
900 | * Send ACK_1 (or equiv.) indicating we received something. | |
901 | * The frame we're acking is supplied. | |
902 | */ | |
903 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
904 | { | |
905 | struct fc_frame *fp; | |
906 | struct fc_frame_header *rx_fh; | |
907 | struct fc_frame_header *fh; | |
908 | struct fc_exch *ep = fc_seq_exch(sp); | |
909 | struct fc_lport *lp = ep->lp; | |
910 | unsigned int f_ctl; | |
911 | ||
912 | /* | |
913 | * Don't send ACKs for class 3. | |
914 | */ | |
915 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
916 | fp = fc_frame_alloc(lp, 0); | |
917 | if (!fp) | |
918 | return; | |
919 | ||
920 | fh = fc_frame_header_get(fp); | |
921 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
922 | fh->fh_type = FC_TYPE_BLS; | |
923 | ||
924 | /* | |
925 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
926 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
927 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
928 | * Last ACK uses bits 7-6 (continue sequence), | |
929 | * bits 5-4 are meaningful (what kind of ACK to use). | |
930 | */ | |
931 | rx_fh = fc_frame_header_get(rx_fp); | |
932 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
933 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
934 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
935 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
936 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
937 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
938 | hton24(fh->fh_f_ctl, f_ctl); | |
939 | ||
940 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
941 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
942 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
943 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
944 | ||
945 | fr_sof(fp) = fr_sof(rx_fp); | |
946 | if (f_ctl & FC_FC_END_SEQ) | |
947 | fr_eof(fp) = FC_EOF_T; | |
948 | else | |
949 | fr_eof(fp) = FC_EOF_N; | |
950 | ||
951 | (void) lp->tt.frame_send(lp, fp); | |
952 | } | |
953 | } | |
954 | ||
955 | /* | |
956 | * Send BLS Reject. | |
957 | * This is for rejecting BA_ABTS only. | |
958 | */ | |
b2ab99c9 RL |
959 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
960 | enum fc_ba_rjt_reason reason, | |
961 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
962 | { |
963 | struct fc_frame *fp; | |
964 | struct fc_frame_header *rx_fh; | |
965 | struct fc_frame_header *fh; | |
966 | struct fc_ba_rjt *rp; | |
967 | struct fc_lport *lp; | |
968 | unsigned int f_ctl; | |
969 | ||
970 | lp = fr_dev(rx_fp); | |
971 | fp = fc_frame_alloc(lp, sizeof(*rp)); | |
972 | if (!fp) | |
973 | return; | |
974 | fh = fc_frame_header_get(fp); | |
975 | rx_fh = fc_frame_header_get(rx_fp); | |
976 | ||
977 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
978 | ||
979 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
980 | rp->br_reason = reason; | |
981 | rp->br_explan = explan; | |
982 | ||
983 | /* | |
984 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
985 | */ | |
986 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
987 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
988 | fh->fh_ox_id = rx_fh->fh_rx_id; | |
989 | fh->fh_rx_id = rx_fh->fh_ox_id; | |
990 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
991 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
992 | fh->fh_type = FC_TYPE_BLS; | |
993 | ||
994 | /* | |
995 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
996 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
997 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
998 | * Last ACK uses bits 7-6 (continue sequence), | |
999 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1000 | * Always set LAST_SEQ, END_SEQ. | |
1001 | */ | |
1002 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1003 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1004 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1005 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1006 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1007 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1008 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1009 | hton24(fh->fh_f_ctl, f_ctl); | |
1010 | ||
1011 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1012 | fr_eof(fp) = FC_EOF_T; | |
1013 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1014 | fr_eof(fp) = FC_EOF_N; | |
1015 | ||
1016 | (void) lp->tt.frame_send(lp, fp); | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Handle an incoming ABTS. This would be for target mode usually, | |
1021 | * but could be due to lost FCP transfer ready, confirm or RRQ. | |
1022 | * We always handle this as an exchange abort, ignoring the parameter. | |
1023 | */ | |
1024 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1025 | { | |
1026 | struct fc_frame *fp; | |
1027 | struct fc_ba_acc *ap; | |
1028 | struct fc_frame_header *fh; | |
1029 | struct fc_seq *sp; | |
1030 | ||
1031 | if (!ep) | |
1032 | goto reject; | |
1033 | spin_lock_bh(&ep->ex_lock); | |
1034 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1035 | spin_unlock_bh(&ep->ex_lock); | |
1036 | goto reject; | |
1037 | } | |
1038 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) | |
1039 | fc_exch_hold(ep); /* hold for REC_QUAL */ | |
1040 | ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL; | |
1041 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1042 | ||
1043 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1044 | if (!fp) { | |
1045 | spin_unlock_bh(&ep->ex_lock); | |
1046 | goto free; | |
1047 | } | |
1048 | fh = fc_frame_header_get(fp); | |
1049 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1050 | memset(ap, 0, sizeof(*ap)); | |
1051 | sp = &ep->seq; | |
1052 | ap->ba_high_seq_cnt = htons(0xffff); | |
1053 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1054 | ap->ba_seq_id = sp->id; | |
1055 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1056 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1057 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1058 | } | |
a7e84f2b | 1059 | sp = fc_seq_start_next_locked(sp); |
42e9a92f RL |
1060 | spin_unlock_bh(&ep->ex_lock); |
1061 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); | |
1062 | fc_frame_free(rx_fp); | |
1063 | return; | |
1064 | ||
1065 | reject: | |
1066 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
1067 | free: | |
1068 | fc_frame_free(rx_fp); | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Handle receive where the other end is originating the sequence. | |
1073 | */ | |
1074 | static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp, | |
1075 | struct fc_frame *fp) | |
1076 | { | |
1077 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1078 | struct fc_seq *sp = NULL; | |
1079 | struct fc_exch *ep = NULL; | |
1080 | enum fc_sof sof; | |
1081 | enum fc_eof eof; | |
1082 | u32 f_ctl; | |
1083 | enum fc_pf_rjt_reason reject; | |
1084 | ||
1085 | fr_seq(fp) = NULL; | |
52ff878c | 1086 | reject = fc_seq_lookup_recip(lp, mp, fp); |
42e9a92f RL |
1087 | if (reject == FC_RJT_NONE) { |
1088 | sp = fr_seq(fp); /* sequence will be held */ | |
1089 | ep = fc_seq_exch(sp); | |
1090 | sof = fr_sof(fp); | |
1091 | eof = fr_eof(fp); | |
1092 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1093 | fc_seq_send_ack(sp, fp); | |
1094 | ||
1095 | /* | |
1096 | * Call the receive function. | |
1097 | * | |
1098 | * The receive function may allocate a new sequence | |
1099 | * over the old one, so we shouldn't change the | |
1100 | * sequence after this. | |
1101 | * | |
1102 | * The frame will be freed by the receive function. | |
1103 | * If new exch resp handler is valid then call that | |
1104 | * first. | |
1105 | */ | |
1106 | if (ep->resp) | |
1107 | ep->resp(sp, fp, ep->arg); | |
1108 | else | |
1109 | lp->tt.lport_recv(lp, sp, fp); | |
1110 | fc_exch_release(ep); /* release from lookup */ | |
1111 | } else { | |
d459b7ea | 1112 | FC_LPORT_DBG(lp, "exch/seq lookup failed: reject %x\n", reject); |
42e9a92f RL |
1113 | fc_frame_free(fp); |
1114 | } | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * Handle receive where the other end is originating the sequence in | |
1119 | * response to our exchange. | |
1120 | */ | |
1121 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1122 | { | |
1123 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1124 | struct fc_seq *sp; | |
1125 | struct fc_exch *ep; | |
1126 | enum fc_sof sof; | |
1127 | u32 f_ctl; | |
1128 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1129 | void *ex_resp_arg; | |
1130 | int rc; | |
1131 | ||
1132 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1133 | if (!ep) { | |
1134 | atomic_inc(&mp->stats.xid_not_found); | |
1135 | goto out; | |
1136 | } | |
30121d14 SM |
1137 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1138 | atomic_inc(&mp->stats.xid_not_found); | |
1139 | goto out; | |
1140 | } | |
42e9a92f RL |
1141 | if (ep->rxid == FC_XID_UNKNOWN) |
1142 | ep->rxid = ntohs(fh->fh_rx_id); | |
1143 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1144 | atomic_inc(&mp->stats.xid_not_found); | |
1145 | goto rel; | |
1146 | } | |
1147 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1148 | ep->did != FC_FID_FLOGI) { | |
1149 | atomic_inc(&mp->stats.xid_not_found); | |
1150 | goto rel; | |
1151 | } | |
1152 | sof = fr_sof(fp); | |
1153 | if (fc_sof_is_init(sof)) { | |
1154 | sp = fc_seq_start_next(&ep->seq); | |
1155 | sp->id = fh->fh_seq_id; | |
1156 | sp->ssb_stat |= SSB_ST_RESP; | |
1157 | } else { | |
1158 | sp = &ep->seq; | |
1159 | if (sp->id != fh->fh_seq_id) { | |
1160 | atomic_inc(&mp->stats.seq_not_found); | |
1161 | goto rel; | |
1162 | } | |
1163 | } | |
1164 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1165 | fr_seq(fp) = sp; | |
1166 | if (f_ctl & FC_FC_SEQ_INIT) | |
1167 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1168 | ||
1169 | if (fc_sof_needs_ack(sof)) | |
1170 | fc_seq_send_ack(sp, fp); | |
1171 | resp = ep->resp; | |
1172 | ex_resp_arg = ep->arg; | |
1173 | ||
1174 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1175 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1176 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1177 | spin_lock_bh(&ep->ex_lock); | |
1178 | rc = fc_exch_done_locked(ep); | |
1179 | WARN_ON(fc_seq_exch(sp) != ep); | |
1180 | spin_unlock_bh(&ep->ex_lock); | |
1181 | if (!rc) | |
1182 | fc_exch_mgr_delete_ep(ep); | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * Call the receive function. | |
1187 | * The sequence is held (has a refcnt) for us, | |
1188 | * but not for the receive function. | |
1189 | * | |
1190 | * The receive function may allocate a new sequence | |
1191 | * over the old one, so we shouldn't change the | |
1192 | * sequence after this. | |
1193 | * | |
1194 | * The frame will be freed by the receive function. | |
1195 | * If new exch resp handler is valid then call that | |
1196 | * first. | |
1197 | */ | |
1198 | if (resp) | |
1199 | resp(sp, fp, ex_resp_arg); | |
1200 | else | |
1201 | fc_frame_free(fp); | |
1202 | fc_exch_release(ep); | |
1203 | return; | |
1204 | rel: | |
1205 | fc_exch_release(ep); | |
1206 | out: | |
1207 | fc_frame_free(fp); | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Handle receive for a sequence where other end is responding to our sequence. | |
1212 | */ | |
1213 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1214 | { | |
1215 | struct fc_seq *sp; | |
1216 | ||
1217 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1218 | |
1219 | if (!sp) | |
42e9a92f | 1220 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1221 | else |
42e9a92f | 1222 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1223 | |
42e9a92f RL |
1224 | fc_frame_free(fp); |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * Handle the response to an ABTS for exchange or sequence. | |
1229 | * This can be BA_ACC or BA_RJT. | |
1230 | */ | |
1231 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1232 | { | |
1233 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1234 | void *ex_resp_arg; | |
1235 | struct fc_frame_header *fh; | |
1236 | struct fc_ba_acc *ap; | |
1237 | struct fc_seq *sp; | |
1238 | u16 low; | |
1239 | u16 high; | |
1240 | int rc = 1, has_rec = 0; | |
1241 | ||
1242 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1243 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1244 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1245 | |
1246 | if (cancel_delayed_work_sync(&ep->timeout_work)) | |
1247 | fc_exch_release(ep); /* release from pending timer hold */ | |
1248 | ||
1249 | spin_lock_bh(&ep->ex_lock); | |
1250 | switch (fh->fh_r_ctl) { | |
1251 | case FC_RCTL_BA_ACC: | |
1252 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1253 | if (!ap) | |
1254 | break; | |
1255 | ||
1256 | /* | |
1257 | * Decide whether to establish a Recovery Qualifier. | |
1258 | * We do this if there is a non-empty SEQ_CNT range and | |
1259 | * SEQ_ID is the same as the one we aborted. | |
1260 | */ | |
1261 | low = ntohs(ap->ba_low_seq_cnt); | |
1262 | high = ntohs(ap->ba_high_seq_cnt); | |
1263 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1264 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1265 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1266 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1267 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1268 | has_rec = 1; | |
1269 | } | |
1270 | break; | |
1271 | case FC_RCTL_BA_RJT: | |
1272 | break; | |
1273 | default: | |
1274 | break; | |
1275 | } | |
1276 | ||
1277 | resp = ep->resp; | |
1278 | ex_resp_arg = ep->arg; | |
1279 | ||
1280 | /* do we need to do some other checks here. Can we reuse more of | |
1281 | * fc_exch_recv_seq_resp | |
1282 | */ | |
1283 | sp = &ep->seq; | |
1284 | /* | |
1285 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1286 | */ | |
1287 | if (ep->fh_type != FC_TYPE_FCP && | |
1288 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1289 | rc = fc_exch_done_locked(ep); | |
1290 | spin_unlock_bh(&ep->ex_lock); | |
1291 | if (!rc) | |
1292 | fc_exch_mgr_delete_ep(ep); | |
1293 | ||
1294 | if (resp) | |
1295 | resp(sp, fp, ex_resp_arg); | |
1296 | else | |
1297 | fc_frame_free(fp); | |
1298 | ||
1299 | if (has_rec) | |
1300 | fc_exch_timer_set(ep, ep->r_a_tov); | |
1301 | ||
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Receive BLS sequence. | |
1306 | * This is always a sequence initiated by the remote side. | |
1307 | * We may be either the originator or recipient of the exchange. | |
1308 | */ | |
1309 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1310 | { | |
1311 | struct fc_frame_header *fh; | |
1312 | struct fc_exch *ep; | |
1313 | u32 f_ctl; | |
1314 | ||
1315 | fh = fc_frame_header_get(fp); | |
1316 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1317 | fr_seq(fp) = NULL; | |
1318 | ||
1319 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1320 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1321 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1322 | spin_lock_bh(&ep->ex_lock); | |
1323 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1324 | spin_unlock_bh(&ep->ex_lock); | |
1325 | } | |
1326 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1327 | /* | |
1328 | * A response to a sequence we initiated. | |
1329 | * This should only be ACKs for class 2 or F. | |
1330 | */ | |
1331 | switch (fh->fh_r_ctl) { | |
1332 | case FC_RCTL_ACK_1: | |
1333 | case FC_RCTL_ACK_0: | |
1334 | break; | |
1335 | default: | |
7414705e RL |
1336 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received", |
1337 | fh->fh_r_ctl, | |
1338 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1339 | break; |
1340 | } | |
1341 | fc_frame_free(fp); | |
1342 | } else { | |
1343 | switch (fh->fh_r_ctl) { | |
1344 | case FC_RCTL_BA_RJT: | |
1345 | case FC_RCTL_BA_ACC: | |
1346 | if (ep) | |
1347 | fc_exch_abts_resp(ep, fp); | |
1348 | else | |
1349 | fc_frame_free(fp); | |
1350 | break; | |
1351 | case FC_RCTL_BA_ABTS: | |
1352 | fc_exch_recv_abts(ep, fp); | |
1353 | break; | |
1354 | default: /* ignore junk */ | |
1355 | fc_frame_free(fp); | |
1356 | break; | |
1357 | } | |
1358 | } | |
1359 | if (ep) | |
1360 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1361 | } | |
1362 | ||
1363 | /* | |
1364 | * Accept sequence with LS_ACC. | |
1365 | * If this fails due to allocation or transmit congestion, assume the | |
1366 | * originator will repeat the sequence. | |
1367 | */ | |
1368 | static void fc_seq_ls_acc(struct fc_seq *req_sp) | |
1369 | { | |
1370 | struct fc_seq *sp; | |
1371 | struct fc_els_ls_acc *acc; | |
1372 | struct fc_frame *fp; | |
1373 | ||
1374 | sp = fc_seq_start_next(req_sp); | |
1375 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc)); | |
1376 | if (fp) { | |
1377 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1378 | memset(acc, 0, sizeof(*acc)); | |
1379 | acc->la_cmd = ELS_LS_ACC; | |
1380 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * Reject sequence with ELS LS_RJT. | |
1386 | * If this fails due to allocation or transmit congestion, assume the | |
1387 | * originator will repeat the sequence. | |
1388 | */ | |
1389 | static void fc_seq_ls_rjt(struct fc_seq *req_sp, enum fc_els_rjt_reason reason, | |
1390 | enum fc_els_rjt_explan explan) | |
1391 | { | |
1392 | struct fc_seq *sp; | |
1393 | struct fc_els_ls_rjt *rjt; | |
1394 | struct fc_frame *fp; | |
1395 | ||
1396 | sp = fc_seq_start_next(req_sp); | |
1397 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*rjt)); | |
1398 | if (fp) { | |
1399 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1400 | memset(rjt, 0, sizeof(*rjt)); | |
1401 | rjt->er_cmd = ELS_LS_RJT; | |
1402 | rjt->er_reason = reason; | |
1403 | rjt->er_explan = explan; | |
1404 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1405 | } | |
1406 | } | |
1407 | ||
1408 | static void fc_exch_reset(struct fc_exch *ep) | |
1409 | { | |
1410 | struct fc_seq *sp; | |
1411 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
1412 | void *arg; | |
1413 | int rc = 1; | |
1414 | ||
1415 | spin_lock_bh(&ep->ex_lock); | |
1416 | ep->state |= FC_EX_RST_CLEANUP; | |
1417 | /* | |
1418 | * we really want to call del_timer_sync, but cannot due | |
1419 | * to the lport calling with the lport lock held (some resp | |
1420 | * functions can also grab the lport lock which could cause | |
1421 | * a deadlock). | |
1422 | */ | |
1423 | if (cancel_delayed_work(&ep->timeout_work)) | |
1424 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
1425 | resp = ep->resp; | |
1426 | ep->resp = NULL; | |
1427 | if (ep->esb_stat & ESB_ST_REC_QUAL) | |
1428 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1429 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1430 | arg = ep->arg; | |
1431 | sp = &ep->seq; | |
1432 | rc = fc_exch_done_locked(ep); | |
1433 | spin_unlock_bh(&ep->ex_lock); | |
1434 | if (!rc) | |
1435 | fc_exch_mgr_delete_ep(ep); | |
1436 | ||
1437 | if (resp) | |
1438 | resp(sp, ERR_PTR(-FC_EX_CLOSED), arg); | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * Reset an exchange manager, releasing all sequences and exchanges. | |
1443 | * If sid is non-zero, reset only exchanges we source from that FID. | |
1444 | * If did is non-zero, reset only exchanges destined to that FID. | |
1445 | */ | |
1f6ff364 | 1446 | void fc_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did) |
42e9a92f RL |
1447 | { |
1448 | struct fc_exch *ep; | |
1449 | struct fc_exch *next; | |
52ff878c VD |
1450 | struct fc_exch_mgr *mp; |
1451 | struct fc_exch_mgr_anchor *ema; | |
42e9a92f | 1452 | |
52ff878c VD |
1453 | list_for_each_entry(ema, &lp->ema_list, ema_list) { |
1454 | mp = ema->mp; | |
1455 | spin_lock_bh(&mp->em_lock); | |
42e9a92f | 1456 | restart: |
52ff878c VD |
1457 | list_for_each_entry_safe(ep, next, &mp->ex_list, ex_list) { |
1458 | if ((lp == ep->lp) && | |
1459 | (sid == 0 || sid == ep->sid) && | |
1460 | (did == 0 || did == ep->did)) { | |
1461 | fc_exch_hold(ep); | |
1462 | spin_unlock_bh(&mp->em_lock); | |
1463 | ||
1464 | fc_exch_reset(ep); | |
1465 | ||
1466 | fc_exch_release(ep); | |
1467 | spin_lock_bh(&mp->em_lock); | |
1468 | ||
1469 | /* | |
1470 | * must restart loop incase while lock | |
1471 | * was down multiple eps were released. | |
1472 | */ | |
1473 | goto restart; | |
1474 | } | |
42e9a92f | 1475 | } |
52ff878c | 1476 | spin_unlock_bh(&mp->em_lock); |
42e9a92f | 1477 | } |
42e9a92f RL |
1478 | } |
1479 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1480 | ||
1481 | /* | |
1482 | * Handle incoming ELS REC - Read Exchange Concise. | |
1483 | * Note that the requesting port may be different than the S_ID in the request. | |
1484 | */ | |
1485 | static void fc_exch_els_rec(struct fc_seq *sp, struct fc_frame *rfp) | |
1486 | { | |
1487 | struct fc_frame *fp; | |
1488 | struct fc_exch *ep; | |
1489 | struct fc_exch_mgr *em; | |
1490 | struct fc_els_rec *rp; | |
1491 | struct fc_els_rec_acc *acc; | |
1492 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1493 | enum fc_els_rjt_explan explan; | |
1494 | u32 sid; | |
1495 | u16 rxid; | |
1496 | u16 oxid; | |
1497 | ||
1498 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); | |
1499 | explan = ELS_EXPL_INV_LEN; | |
1500 | if (!rp) | |
1501 | goto reject; | |
1502 | sid = ntoh24(rp->rec_s_id); | |
1503 | rxid = ntohs(rp->rec_rx_id); | |
1504 | oxid = ntohs(rp->rec_ox_id); | |
1505 | ||
1506 | /* | |
1507 | * Currently it's hard to find the local S_ID from the exchange | |
1508 | * manager. This will eventually be fixed, but for now it's easier | |
1509 | * to lookup the subject exchange twice, once as if we were | |
1510 | * the initiator, and then again if we weren't. | |
1511 | */ | |
1512 | em = fc_seq_exch(sp)->em; | |
1513 | ep = fc_exch_find(em, oxid); | |
1514 | explan = ELS_EXPL_OXID_RXID; | |
1515 | if (ep && ep->oid == sid) { | |
1516 | if (ep->rxid != FC_XID_UNKNOWN && | |
1517 | rxid != FC_XID_UNKNOWN && | |
1518 | ep->rxid != rxid) | |
1519 | goto rel; | |
1520 | } else { | |
1521 | if (ep) | |
1522 | fc_exch_release(ep); | |
1523 | ep = NULL; | |
1524 | if (rxid != FC_XID_UNKNOWN) | |
1525 | ep = fc_exch_find(em, rxid); | |
1526 | if (!ep) | |
1527 | goto reject; | |
1528 | } | |
1529 | ||
1530 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc)); | |
1531 | if (!fp) { | |
1532 | fc_exch_done(sp); | |
1533 | goto out; | |
1534 | } | |
1535 | sp = fc_seq_start_next(sp); | |
1536 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1537 | memset(acc, 0, sizeof(*acc)); | |
1538 | acc->reca_cmd = ELS_LS_ACC; | |
1539 | acc->reca_ox_id = rp->rec_ox_id; | |
1540 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1541 | acc->reca_rx_id = htons(ep->rxid); | |
1542 | if (ep->sid == ep->oid) | |
1543 | hton24(acc->reca_rfid, ep->did); | |
1544 | else | |
1545 | hton24(acc->reca_rfid, ep->sid); | |
1546 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1547 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1548 | ESB_ST_SEQ_INIT | | |
1549 | ESB_ST_COMPLETE)); | |
1550 | sp = fc_seq_start_next(sp); | |
1551 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1552 | out: | |
1553 | fc_exch_release(ep); | |
1554 | fc_frame_free(rfp); | |
1555 | return; | |
1556 | ||
1557 | rel: | |
1558 | fc_exch_release(ep); | |
1559 | reject: | |
1560 | fc_seq_ls_rjt(sp, reason, explan); | |
1561 | fc_frame_free(rfp); | |
1562 | } | |
1563 | ||
1564 | /* | |
1565 | * Handle response from RRQ. | |
1566 | * Not much to do here, really. | |
1567 | * Should report errors. | |
1568 | * | |
1569 | * TODO: fix error handler. | |
1570 | */ | |
1571 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
1572 | { | |
1573 | struct fc_exch *aborted_ep = arg; | |
1574 | unsigned int op; | |
1575 | ||
1576 | if (IS_ERR(fp)) { | |
1577 | int err = PTR_ERR(fp); | |
1578 | ||
78342da3 | 1579 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 1580 | goto cleanup; |
7414705e RL |
1581 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
1582 | "frame error %d\n", err); | |
42e9a92f RL |
1583 | return; |
1584 | } | |
1585 | ||
1586 | op = fc_frame_payload_op(fp); | |
1587 | fc_frame_free(fp); | |
1588 | ||
1589 | switch (op) { | |
1590 | case ELS_LS_RJT: | |
7414705e | 1591 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ"); |
42e9a92f RL |
1592 | /* fall through */ |
1593 | case ELS_LS_ACC: | |
1594 | goto cleanup; | |
1595 | default: | |
7414705e RL |
1596 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x " |
1597 | "for RRQ", op); | |
42e9a92f RL |
1598 | return; |
1599 | } | |
1600 | ||
1601 | cleanup: | |
1602 | fc_exch_done(&aborted_ep->seq); | |
1603 | /* drop hold for rec qual */ | |
1604 | fc_exch_release(aborted_ep); | |
1605 | } | |
1606 | ||
1607 | /* | |
1608 | * Send ELS RRQ - Reinstate Recovery Qualifier. | |
1609 | * This tells the remote port to stop blocking the use of | |
1610 | * the exchange and the seq_cnt range. | |
1611 | */ | |
1612 | static void fc_exch_rrq(struct fc_exch *ep) | |
1613 | { | |
1614 | struct fc_lport *lp; | |
1615 | struct fc_els_rrq *rrq; | |
1616 | struct fc_frame *fp; | |
42e9a92f RL |
1617 | u32 did; |
1618 | ||
1619 | lp = ep->lp; | |
1620 | ||
1621 | fp = fc_frame_alloc(lp, sizeof(*rrq)); | |
1622 | if (!fp) | |
a0cc1ecc VD |
1623 | goto retry; |
1624 | ||
42e9a92f RL |
1625 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
1626 | memset(rrq, 0, sizeof(*rrq)); | |
1627 | rrq->rrq_cmd = ELS_RRQ; | |
1628 | hton24(rrq->rrq_s_id, ep->sid); | |
1629 | rrq->rrq_ox_id = htons(ep->oxid); | |
1630 | rrq->rrq_rx_id = htons(ep->rxid); | |
1631 | ||
1632 | did = ep->did; | |
1633 | if (ep->esb_stat & ESB_ST_RESP) | |
1634 | did = ep->sid; | |
1635 | ||
1636 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
1637 | fc_host_port_id(lp->host), FC_TYPE_ELS, | |
1638 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
1639 | ||
a0cc1ecc VD |
1640 | if (fc_exch_seq_send(lp, fp, fc_exch_rrq_resp, NULL, ep, lp->e_d_tov)) |
1641 | return; | |
1642 | ||
1643 | retry: | |
1644 | spin_lock_bh(&ep->ex_lock); | |
1645 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
1646 | spin_unlock_bh(&ep->ex_lock); | |
1647 | /* drop hold for rec qual */ | |
1648 | fc_exch_release(ep); | |
42e9a92f RL |
1649 | return; |
1650 | } | |
a0cc1ecc VD |
1651 | ep->esb_stat |= ESB_ST_REC_QUAL; |
1652 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1653 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
1654 | } |
1655 | ||
1656 | ||
1657 | /* | |
1658 | * Handle incoming ELS RRQ - Reset Recovery Qualifier. | |
1659 | */ | |
1660 | static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp) | |
1661 | { | |
1662 | struct fc_exch *ep; /* request or subject exchange */ | |
1663 | struct fc_els_rrq *rp; | |
1664 | u32 sid; | |
1665 | u16 xid; | |
1666 | enum fc_els_rjt_explan explan; | |
1667 | ||
1668 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1669 | explan = ELS_EXPL_INV_LEN; | |
1670 | if (!rp) | |
1671 | goto reject; | |
1672 | ||
1673 | /* | |
1674 | * lookup subject exchange. | |
1675 | */ | |
1676 | ep = fc_seq_exch(sp); | |
1677 | sid = ntoh24(rp->rrq_s_id); /* subject source */ | |
1678 | xid = ep->did == sid ? ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
1679 | ep = fc_exch_find(ep->em, xid); | |
1680 | ||
1681 | explan = ELS_EXPL_OXID_RXID; | |
1682 | if (!ep) | |
1683 | goto reject; | |
1684 | spin_lock_bh(&ep->ex_lock); | |
1685 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
1686 | goto unlock_reject; | |
1687 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
1688 | ep->rxid != FC_XID_UNKNOWN) | |
1689 | goto unlock_reject; | |
1690 | explan = ELS_EXPL_SID; | |
1691 | if (ep->sid != sid) | |
1692 | goto unlock_reject; | |
1693 | ||
1694 | /* | |
1695 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
1696 | */ | |
1697 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
1698 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1699 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
1700 | } | |
1701 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1702 | if (cancel_delayed_work(&ep->timeout_work)) | |
1703 | atomic_dec(&ep->ex_refcnt); /* drop timer hold */ | |
1704 | } | |
1705 | ||
1706 | spin_unlock_bh(&ep->ex_lock); | |
1707 | ||
1708 | /* | |
1709 | * Send LS_ACC. | |
1710 | */ | |
1711 | fc_seq_ls_acc(sp); | |
1712 | fc_frame_free(fp); | |
1713 | return; | |
1714 | ||
1715 | unlock_reject: | |
1716 | spin_unlock_bh(&ep->ex_lock); | |
1717 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
1718 | reject: | |
1719 | fc_seq_ls_rjt(sp, ELS_RJT_LOGIC, explan); | |
1720 | fc_frame_free(fp); | |
1721 | } | |
1722 | ||
96316099 VD |
1723 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
1724 | struct fc_exch_mgr *mp, | |
1725 | bool (*match)(struct fc_frame *)) | |
1726 | { | |
1727 | struct fc_exch_mgr_anchor *ema; | |
1728 | ||
1729 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
1730 | if (!ema) | |
1731 | return ema; | |
1732 | ||
1733 | ema->mp = mp; | |
1734 | ema->match = match; | |
1735 | /* add EM anchor to EM anchors list */ | |
1736 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
1737 | kref_get(&mp->kref); | |
1738 | return ema; | |
1739 | } | |
1740 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
1741 | ||
1742 | static void fc_exch_mgr_destroy(struct kref *kref) | |
1743 | { | |
1744 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
1745 | ||
1746 | /* | |
1747 | * The total exch count must be zero | |
1748 | * before freeing exchange manager. | |
1749 | */ | |
1750 | WARN_ON(mp->total_exches != 0); | |
1751 | mempool_destroy(mp->ep_pool); | |
1752 | kfree(mp); | |
1753 | } | |
1754 | ||
1755 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) | |
1756 | { | |
1757 | /* remove EM anchor from EM anchors list */ | |
1758 | list_del(&ema->ema_list); | |
1759 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
1760 | kfree(ema); | |
1761 | } | |
1762 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
1763 | ||
42e9a92f RL |
1764 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp, |
1765 | enum fc_class class, | |
52ff878c VD |
1766 | u16 min_xid, u16 max_xid, |
1767 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
1768 | { |
1769 | struct fc_exch_mgr *mp; | |
1770 | size_t len; | |
1771 | ||
d7179680 | 1772 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) { |
7414705e RL |
1773 | FC_LPORT_DBG(lp, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
1774 | min_xid, max_xid); | |
42e9a92f RL |
1775 | return NULL; |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Memory need for EM | |
1780 | */ | |
42e9a92f RL |
1781 | len = (max_xid - min_xid + 1) * (sizeof(struct fc_exch *)); |
1782 | len += sizeof(struct fc_exch_mgr); | |
1783 | ||
1784 | mp = kzalloc(len, GFP_ATOMIC); | |
1785 | if (!mp) | |
1786 | return NULL; | |
1787 | ||
1788 | mp->class = class; | |
1789 | mp->total_exches = 0; | |
1790 | mp->exches = (struct fc_exch **)(mp + 1); | |
42e9a92f RL |
1791 | /* adjust em exch xid range for offload */ |
1792 | mp->min_xid = min_xid; | |
1793 | mp->max_xid = max_xid; | |
d7179680 | 1794 | mp->next_xid = min_xid; |
42e9a92f RL |
1795 | |
1796 | INIT_LIST_HEAD(&mp->ex_list); | |
1797 | spin_lock_init(&mp->em_lock); | |
1798 | ||
1799 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
1800 | if (!mp->ep_pool) | |
1801 | goto free_mp; | |
1802 | ||
52ff878c VD |
1803 | kref_init(&mp->kref); |
1804 | if (!fc_exch_mgr_add(lp, mp, match)) { | |
1805 | mempool_destroy(mp->ep_pool); | |
1806 | goto free_mp; | |
1807 | } | |
1808 | ||
1809 | /* | |
1810 | * Above kref_init() sets mp->kref to 1 and then | |
1811 | * call to fc_exch_mgr_add incremented mp->kref again, | |
1812 | * so adjust that extra increment. | |
1813 | */ | |
1814 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
1815 | return mp; |
1816 | ||
1817 | free_mp: | |
1818 | kfree(mp); | |
1819 | return NULL; | |
1820 | } | |
1821 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
1822 | ||
52ff878c | 1823 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 1824 | { |
52ff878c VD |
1825 | struct fc_exch_mgr_anchor *ema, *next; |
1826 | ||
1827 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) | |
1828 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
1829 | } |
1830 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
1831 | ||
42e9a92f RL |
1832 | |
1833 | struct fc_seq *fc_exch_seq_send(struct fc_lport *lp, | |
1834 | struct fc_frame *fp, | |
1835 | void (*resp)(struct fc_seq *, | |
1836 | struct fc_frame *fp, | |
1837 | void *arg), | |
1838 | void (*destructor)(struct fc_seq *, void *), | |
1839 | void *arg, u32 timer_msec) | |
1840 | { | |
1841 | struct fc_exch *ep; | |
1842 | struct fc_seq *sp = NULL; | |
1843 | struct fc_frame_header *fh; | |
1844 | int rc = 1; | |
1845 | ||
52ff878c | 1846 | ep = fc_exch_alloc(lp, fp); |
42e9a92f RL |
1847 | if (!ep) { |
1848 | fc_frame_free(fp); | |
1849 | return NULL; | |
1850 | } | |
1851 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1852 | fh = fc_frame_header_get(fp); | |
1853 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
1854 | ep->resp = resp; | |
1855 | ep->destructor = destructor; | |
1856 | ep->arg = arg; | |
1857 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
1858 | ep->lp = lp; | |
1859 | sp = &ep->seq; | |
1860 | ||
1861 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
1862 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
1863 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
1864 | sp->cnt++; | |
1865 | ||
d7179680 VD |
1866 | if (ep->xid <= lp->lro_xid) |
1867 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); | |
b277d2aa | 1868 | |
42e9a92f RL |
1869 | if (unlikely(lp->tt.frame_send(lp, fp))) |
1870 | goto err; | |
1871 | ||
1872 | if (timer_msec) | |
1873 | fc_exch_timer_set_locked(ep, timer_msec); | |
1874 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
1875 | ||
1876 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
1877 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
1878 | spin_unlock_bh(&ep->ex_lock); | |
1879 | return sp; | |
1880 | err: | |
1881 | rc = fc_exch_done_locked(ep); | |
1882 | spin_unlock_bh(&ep->ex_lock); | |
1883 | if (!rc) | |
1884 | fc_exch_mgr_delete_ep(ep); | |
1885 | return NULL; | |
1886 | } | |
1887 | EXPORT_SYMBOL(fc_exch_seq_send); | |
1888 | ||
1889 | /* | |
1890 | * Receive a frame | |
1891 | */ | |
52ff878c | 1892 | void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp) |
42e9a92f RL |
1893 | { |
1894 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c VD |
1895 | struct fc_exch_mgr_anchor *ema; |
1896 | u32 f_ctl, found = 0; | |
1897 | u16 oxid; | |
42e9a92f RL |
1898 | |
1899 | /* lport lock ? */ | |
52ff878c | 1900 | if (!lp || lp->state == LPORT_ST_DISABLED) { |
7414705e RL |
1901 | FC_LPORT_DBG(lp, "Receiving frames for an lport that " |
1902 | "has not been initialized correctly\n"); | |
42e9a92f RL |
1903 | fc_frame_free(fp); |
1904 | return; | |
1905 | } | |
1906 | ||
52ff878c VD |
1907 | f_ctl = ntoh24(fh->fh_f_ctl); |
1908 | oxid = ntohs(fh->fh_ox_id); | |
1909 | if (f_ctl & FC_FC_EX_CTX) { | |
1910 | list_for_each_entry(ema, &lp->ema_list, ema_list) { | |
1911 | if ((oxid >= ema->mp->min_xid) && | |
1912 | (oxid <= ema->mp->max_xid)) { | |
1913 | found = 1; | |
1914 | break; | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | if (!found) { | |
1919 | FC_LPORT_DBG(lp, "Received response for out " | |
1920 | "of range oxid:%hx\n", oxid); | |
1921 | fc_frame_free(fp); | |
1922 | return; | |
1923 | } | |
1924 | } else | |
1925 | ema = list_entry(lp->ema_list.prev, typeof(*ema), ema_list); | |
1926 | ||
42e9a92f RL |
1927 | /* |
1928 | * If frame is marked invalid, just drop it. | |
1929 | */ | |
42e9a92f RL |
1930 | switch (fr_eof(fp)) { |
1931 | case FC_EOF_T: | |
1932 | if (f_ctl & FC_FC_END_SEQ) | |
1933 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
1934 | /* fall through */ | |
1935 | case FC_EOF_N: | |
1936 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 1937 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
1938 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
1939 | FC_FC_EX_CTX) | |
52ff878c | 1940 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 1941 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 1942 | fc_exch_recv_resp(ema->mp, fp); |
42e9a92f | 1943 | else |
52ff878c | 1944 | fc_exch_recv_req(lp, ema->mp, fp); |
42e9a92f RL |
1945 | break; |
1946 | default: | |
d459b7ea | 1947 | FC_LPORT_DBG(lp, "dropping invalid frame (eof %x)", fr_eof(fp)); |
42e9a92f | 1948 | fc_frame_free(fp); |
42e9a92f RL |
1949 | } |
1950 | } | |
1951 | EXPORT_SYMBOL(fc_exch_recv); | |
1952 | ||
1953 | int fc_exch_init(struct fc_lport *lp) | |
1954 | { | |
42e9a92f RL |
1955 | if (!lp->tt.seq_start_next) |
1956 | lp->tt.seq_start_next = fc_seq_start_next; | |
1957 | ||
1958 | if (!lp->tt.exch_seq_send) | |
1959 | lp->tt.exch_seq_send = fc_exch_seq_send; | |
1960 | ||
1961 | if (!lp->tt.seq_send) | |
1962 | lp->tt.seq_send = fc_seq_send; | |
1963 | ||
1964 | if (!lp->tt.seq_els_rsp_send) | |
1965 | lp->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
1966 | ||
1967 | if (!lp->tt.exch_done) | |
1968 | lp->tt.exch_done = fc_exch_done; | |
1969 | ||
1970 | if (!lp->tt.exch_mgr_reset) | |
1971 | lp->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
1972 | ||
1973 | if (!lp->tt.seq_exch_abort) | |
1974 | lp->tt.seq_exch_abort = fc_seq_exch_abort; | |
1975 | ||
1976 | return 0; | |
1977 | } | |
1978 | EXPORT_SYMBOL(fc_exch_init); | |
1979 | ||
1980 | int fc_setup_exch_mgr(void) | |
1981 | { | |
1982 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
1983 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
1984 | if (!fc_em_cachep) | |
1985 | return -ENOMEM; | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | void fc_destroy_exch_mgr(void) | |
1990 | { | |
1991 | kmem_cache_destroy(fc_em_cachep); | |
1992 | } |