Commit | Line | Data |
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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 | ||
e4bc50be VD |
35 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
36 | EXPORT_SYMBOL(fc_cpu_mask); | |
37 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ | |
7414705e | 38 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
42e9a92f RL |
39 | |
40 | /* | |
41 | * Structure and function definitions for managing Fibre Channel Exchanges | |
42 | * and Sequences. | |
43 | * | |
44 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
45 | * | |
46 | * fc_exch_mgr holds the exchange state for an N port | |
47 | * | |
48 | * fc_exch holds state for one exchange and links to its active sequence. | |
49 | * | |
50 | * fc_seq holds the state for an individual sequence. | |
51 | */ | |
52 | ||
e4bc50be VD |
53 | /* |
54 | * Per cpu exchange pool | |
55 | * | |
56 | * This structure manages per cpu exchanges in array of exchange pointers. | |
57 | * This array is allocated followed by struct fc_exch_pool memory for | |
58 | * assigned range of exchanges to per cpu pool. | |
59 | */ | |
60 | struct fc_exch_pool { | |
61 | u16 next_index; /* next possible free exchange index */ | |
62 | u16 total_exches; /* total allocated exchanges */ | |
63 | spinlock_t lock; /* exch pool lock */ | |
64 | struct list_head ex_list; /* allocated exchanges list */ | |
65 | }; | |
66 | ||
42e9a92f RL |
67 | /* |
68 | * Exchange manager. | |
69 | * | |
70 | * This structure is the center for creating exchanges and sequences. | |
71 | * It manages the allocation of exchange IDs. | |
72 | */ | |
73 | struct fc_exch_mgr { | |
74 | enum fc_class class; /* default class for sequences */ | |
96316099 | 75 | struct kref kref; /* exchange mgr reference count */ |
42e9a92f RL |
76 | spinlock_t em_lock; /* exchange manager lock, |
77 | must be taken before ex_lock */ | |
d7179680 | 78 | u16 next_xid; /* next possible free exchange ID */ |
42e9a92f RL |
79 | u16 min_xid; /* min exchange ID */ |
80 | u16 max_xid; /* max exchange ID */ | |
81 | u16 max_read; /* max exchange ID for read */ | |
82 | u16 last_read; /* last xid allocated for read */ | |
83 | u32 total_exches; /* total allocated exchanges */ | |
84 | struct list_head ex_list; /* allocated exchanges list */ | |
42e9a92f | 85 | mempool_t *ep_pool; /* reserve ep's */ |
e4bc50be VD |
86 | u16 pool_max_index; /* max exch array index in exch pool */ |
87 | struct fc_exch_pool *pool; /* per cpu exch pool */ | |
42e9a92f RL |
88 | |
89 | /* | |
90 | * currently exchange mgr stats are updated but not used. | |
91 | * either stats can be expose via sysfs or remove them | |
92 | * all together if not used XXX | |
93 | */ | |
94 | struct { | |
95 | atomic_t no_free_exch; | |
96 | atomic_t no_free_exch_xid; | |
97 | atomic_t xid_not_found; | |
98 | atomic_t xid_busy; | |
99 | atomic_t seq_not_found; | |
100 | atomic_t non_bls_resp; | |
101 | } stats; | |
102 | struct fc_exch **exches; /* for exch pointers indexed by xid */ | |
103 | }; | |
104 | #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq) | |
105 | ||
96316099 VD |
106 | struct fc_exch_mgr_anchor { |
107 | struct list_head ema_list; | |
108 | struct fc_exch_mgr *mp; | |
109 | bool (*match)(struct fc_frame *); | |
110 | }; | |
111 | ||
42e9a92f RL |
112 | static void fc_exch_rrq(struct fc_exch *); |
113 | static void fc_seq_ls_acc(struct fc_seq *); | |
114 | static void fc_seq_ls_rjt(struct fc_seq *, enum fc_els_rjt_reason, | |
115 | enum fc_els_rjt_explan); | |
116 | static void fc_exch_els_rec(struct fc_seq *, struct fc_frame *); | |
117 | static void fc_exch_els_rrq(struct fc_seq *, struct fc_frame *); | |
118 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp); | |
119 | ||
120 | /* | |
121 | * Internal implementation notes. | |
122 | * | |
123 | * The exchange manager is one by default in libfc but LLD may choose | |
124 | * to have one per CPU. The sequence manager is one per exchange manager | |
125 | * and currently never separated. | |
126 | * | |
127 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
128 | * assigned by the Sequence Initiator that shall be unique for a specific | |
129 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
130 | * qualified by exchange ID, which one might think it would be. | |
131 | * In practice this limits the number of open sequences and exchanges to 256 | |
132 | * per session. For most targets we could treat this limit as per exchange. | |
133 | * | |
134 | * The exchange and its sequence are freed when the last sequence is received. | |
135 | * It's possible for the remote port to leave an exchange open without | |
136 | * sending any sequences. | |
137 | * | |
138 | * Notes on reference counts: | |
139 | * | |
140 | * Exchanges are reference counted and exchange gets freed when the reference | |
141 | * count becomes zero. | |
142 | * | |
143 | * Timeouts: | |
144 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
145 | * | |
146 | * Sequence event handling: | |
147 | * | |
148 | * The following events may occur on initiator sequences: | |
149 | * | |
150 | * Send. | |
151 | * For now, the whole thing is sent. | |
152 | * Receive ACK | |
153 | * This applies only to class F. | |
154 | * The sequence is marked complete. | |
155 | * ULP completion. | |
156 | * The upper layer calls fc_exch_done() when done | |
157 | * with exchange and sequence tuple. | |
158 | * RX-inferred completion. | |
159 | * When we receive the next sequence on the same exchange, we can | |
160 | * retire the previous sequence ID. (XXX not implemented). | |
161 | * Timeout. | |
162 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
163 | * E_D_TOV causes abort and calls upper layer response handler | |
164 | * with FC_EX_TIMEOUT error. | |
165 | * Receive RJT | |
166 | * XXX defer. | |
167 | * Send ABTS | |
168 | * On timeout. | |
169 | * | |
170 | * The following events may occur on recipient sequences: | |
171 | * | |
172 | * Receive | |
173 | * Allocate sequence for first frame received. | |
174 | * Hold during receive handler. | |
175 | * Release when final frame received. | |
176 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
177 | * Receive ABTS | |
178 | * Deallocate sequence | |
179 | * Send RJT | |
180 | * Deallocate | |
181 | * | |
182 | * For now, we neglect conditions where only part of a sequence was | |
183 | * received or transmitted, or where out-of-order receipt is detected. | |
184 | */ | |
185 | ||
186 | /* | |
187 | * Locking notes: | |
188 | * | |
189 | * The EM code run in a per-CPU worker thread. | |
190 | * | |
191 | * To protect against concurrency between a worker thread code and timers, | |
192 | * sequence allocation and deallocation must be locked. | |
193 | * - exchange refcnt can be done atomicly without locks. | |
194 | * - sequence allocation must be locked by exch lock. | |
195 | * - If the em_lock and ex_lock must be taken at the same time, then the | |
196 | * em_lock must be taken before the ex_lock. | |
197 | */ | |
198 | ||
199 | /* | |
200 | * opcode names for debugging. | |
201 | */ | |
202 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
203 | ||
204 | #define FC_TABLE_SIZE(x) (sizeof(x) / sizeof(x[0])) | |
205 | ||
206 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, | |
207 | unsigned int max_index) | |
208 | { | |
209 | const char *name = NULL; | |
210 | ||
211 | if (op < max_index) | |
212 | name = table[op]; | |
213 | if (!name) | |
214 | name = "unknown"; | |
215 | return name; | |
216 | } | |
217 | ||
218 | static const char *fc_exch_rctl_name(unsigned int op) | |
219 | { | |
220 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
221 | FC_TABLE_SIZE(fc_exch_rctl_names)); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Hold an exchange - keep it from being freed. | |
226 | */ | |
227 | static void fc_exch_hold(struct fc_exch *ep) | |
228 | { | |
229 | atomic_inc(&ep->ex_refcnt); | |
230 | } | |
231 | ||
232 | /* | |
233 | * setup fc hdr by initializing few more FC header fields and sof/eof. | |
234 | * Initialized fields by this func: | |
235 | * - fh_ox_id, fh_rx_id, fh_seq_id, fh_seq_cnt | |
236 | * - sof and eof | |
237 | */ | |
238 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
239 | u32 f_ctl) | |
240 | { | |
241 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
242 | u16 fill; | |
243 | ||
244 | fr_sof(fp) = ep->class; | |
245 | if (ep->seq.cnt) | |
246 | fr_sof(fp) = fc_sof_normal(ep->class); | |
247 | ||
248 | if (f_ctl & FC_FC_END_SEQ) { | |
249 | fr_eof(fp) = FC_EOF_T; | |
250 | if (fc_sof_needs_ack(ep->class)) | |
251 | fr_eof(fp) = FC_EOF_N; | |
252 | /* | |
253 | * Form f_ctl. | |
254 | * The number of fill bytes to make the length a 4-byte | |
255 | * multiple is the low order 2-bits of the f_ctl. | |
256 | * The fill itself will have been cleared by the frame | |
257 | * allocation. | |
258 | * After this, the length will be even, as expected by | |
259 | * the transport. | |
260 | */ | |
261 | fill = fr_len(fp) & 3; | |
262 | if (fill) { | |
263 | fill = 4 - fill; | |
264 | /* TODO, this may be a problem with fragmented skb */ | |
265 | skb_put(fp_skb(fp), fill); | |
266 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
267 | } | |
268 | } else { | |
269 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
270 | fr_eof(fp) = FC_EOF_N; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Initialize remainig fh fields | |
275 | * from fc_fill_fc_hdr | |
276 | */ | |
277 | fh->fh_ox_id = htons(ep->oxid); | |
278 | fh->fh_rx_id = htons(ep->rxid); | |
279 | fh->fh_seq_id = ep->seq.id; | |
280 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
281 | } | |
282 | ||
283 | ||
284 | /* | |
285 | * Release a reference to an exchange. | |
286 | * If the refcnt goes to zero and the exchange is complete, it is freed. | |
287 | */ | |
288 | static void fc_exch_release(struct fc_exch *ep) | |
289 | { | |
290 | struct fc_exch_mgr *mp; | |
291 | ||
292 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
293 | mp = ep->em; | |
294 | if (ep->destructor) | |
295 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 296 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
297 | mempool_free(ep, mp->ep_pool); |
298 | } | |
299 | } | |
300 | ||
301 | static int fc_exch_done_locked(struct fc_exch *ep) | |
302 | { | |
303 | int rc = 1; | |
304 | ||
305 | /* | |
306 | * We must check for completion in case there are two threads | |
307 | * tyring to complete this. But the rrq code will reuse the | |
308 | * ep, and in that case we only clear the resp and set it as | |
309 | * complete, so it can be reused by the timer to send the rrq. | |
310 | */ | |
311 | ep->resp = NULL; | |
312 | if (ep->state & FC_EX_DONE) | |
313 | return rc; | |
314 | ep->esb_stat |= ESB_ST_COMPLETE; | |
315 | ||
316 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
317 | ep->state |= FC_EX_DONE; | |
318 | if (cancel_delayed_work(&ep->timeout_work)) | |
319 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
320 | rc = 0; | |
321 | } | |
322 | return rc; | |
323 | } | |
324 | ||
e4bc50be VD |
325 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
326 | u16 index) | |
327 | { | |
328 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); | |
329 | return exches[index]; | |
330 | } | |
331 | ||
332 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, | |
333 | struct fc_exch *ep) | |
334 | { | |
335 | ((struct fc_exch **)(pool + 1))[index] = ep; | |
336 | } | |
337 | ||
42e9a92f RL |
338 | static void fc_exch_mgr_delete_ep(struct fc_exch *ep) |
339 | { | |
340 | struct fc_exch_mgr *mp; | |
341 | ||
342 | mp = ep->em; | |
343 | spin_lock_bh(&mp->em_lock); | |
344 | WARN_ON(mp->total_exches <= 0); | |
345 | mp->total_exches--; | |
346 | mp->exches[ep->xid - mp->min_xid] = NULL; | |
347 | list_del(&ep->ex_list); | |
348 | spin_unlock_bh(&mp->em_lock); | |
349 | fc_exch_release(ep); /* drop hold for exch in mp */ | |
350 | } | |
351 | ||
352 | /* | |
353 | * Internal version of fc_exch_timer_set - used with lock held. | |
354 | */ | |
355 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
356 | unsigned int timer_msec) | |
357 | { | |
358 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
359 | return; | |
360 | ||
cd305ce4 | 361 | FC_EXCH_DBG(ep, "Exchange timer armed\n"); |
7414705e | 362 | |
42e9a92f RL |
363 | if (schedule_delayed_work(&ep->timeout_work, |
364 | msecs_to_jiffies(timer_msec))) | |
365 | fc_exch_hold(ep); /* hold for timer */ | |
366 | } | |
367 | ||
368 | /* | |
369 | * Set timer for an exchange. | |
370 | * The time is a minimum delay in milliseconds until the timer fires. | |
371 | * Used for upper level protocols to time out the exchange. | |
372 | * The timer is cancelled when it fires or when the exchange completes. | |
373 | * Returns non-zero if a timer couldn't be allocated. | |
374 | */ | |
375 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
376 | { | |
377 | spin_lock_bh(&ep->ex_lock); | |
378 | fc_exch_timer_set_locked(ep, timer_msec); | |
379 | spin_unlock_bh(&ep->ex_lock); | |
380 | } | |
381 | ||
382 | int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec) | |
383 | { | |
384 | struct fc_seq *sp; | |
385 | struct fc_exch *ep; | |
386 | struct fc_frame *fp; | |
387 | int error; | |
388 | ||
389 | ep = fc_seq_exch(req_sp); | |
390 | ||
391 | spin_lock_bh(&ep->ex_lock); | |
392 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || | |
393 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) { | |
394 | spin_unlock_bh(&ep->ex_lock); | |
395 | return -ENXIO; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Send the abort on a new sequence if possible. | |
400 | */ | |
401 | sp = fc_seq_start_next_locked(&ep->seq); | |
402 | if (!sp) { | |
403 | spin_unlock_bh(&ep->ex_lock); | |
404 | return -ENOMEM; | |
405 | } | |
406 | ||
407 | ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL; | |
408 | if (timer_msec) | |
409 | fc_exch_timer_set_locked(ep, timer_msec); | |
410 | spin_unlock_bh(&ep->ex_lock); | |
411 | ||
412 | /* | |
413 | * If not logged into the fabric, don't send ABTS but leave | |
414 | * sequence active until next timeout. | |
415 | */ | |
416 | if (!ep->sid) | |
417 | return 0; | |
418 | ||
419 | /* | |
420 | * Send an abort for the sequence that timed out. | |
421 | */ | |
422 | fp = fc_frame_alloc(ep->lp, 0); | |
423 | if (fp) { | |
424 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
425 | FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
426 | error = fc_seq_send(ep->lp, sp, fp); | |
427 | } else | |
428 | error = -ENOBUFS; | |
429 | return error; | |
430 | } | |
431 | EXPORT_SYMBOL(fc_seq_exch_abort); | |
432 | ||
433 | /* | |
434 | * Exchange timeout - handle exchange timer expiration. | |
435 | * The timer will have been cancelled before this is called. | |
436 | */ | |
437 | static void fc_exch_timeout(struct work_struct *work) | |
438 | { | |
439 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
440 | timeout_work.work); | |
441 | struct fc_seq *sp = &ep->seq; | |
442 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
443 | void *arg; | |
444 | u32 e_stat; | |
445 | int rc = 1; | |
446 | ||
cd305ce4 RL |
447 | FC_EXCH_DBG(ep, "Exchange timed out\n"); |
448 | ||
42e9a92f RL |
449 | spin_lock_bh(&ep->ex_lock); |
450 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
451 | goto unlock; | |
452 | ||
453 | e_stat = ep->esb_stat; | |
454 | if (e_stat & ESB_ST_COMPLETE) { | |
455 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 456 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
457 | if (e_stat & ESB_ST_REC_QUAL) |
458 | fc_exch_rrq(ep); | |
42e9a92f RL |
459 | goto done; |
460 | } else { | |
461 | resp = ep->resp; | |
462 | arg = ep->arg; | |
463 | ep->resp = NULL; | |
464 | if (e_stat & ESB_ST_ABNORMAL) | |
465 | rc = fc_exch_done_locked(ep); | |
466 | spin_unlock_bh(&ep->ex_lock); | |
467 | if (!rc) | |
468 | fc_exch_mgr_delete_ep(ep); | |
469 | if (resp) | |
470 | resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg); | |
471 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); | |
472 | goto done; | |
473 | } | |
474 | unlock: | |
475 | spin_unlock_bh(&ep->ex_lock); | |
476 | done: | |
477 | /* | |
478 | * This release matches the hold taken when the timer was set. | |
479 | */ | |
480 | fc_exch_release(ep); | |
481 | } | |
482 | ||
483 | /* | |
484 | * Allocate a sequence. | |
485 | * | |
486 | * We don't support multiple originated sequences on the same exchange. | |
487 | * By implication, any previously originated sequence on this exchange | |
488 | * is complete, and we reallocate the same sequence. | |
489 | */ | |
490 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
491 | { | |
492 | struct fc_seq *sp; | |
493 | ||
494 | sp = &ep->seq; | |
495 | sp->ssb_stat = 0; | |
496 | sp->cnt = 0; | |
497 | sp->id = seq_id; | |
498 | return sp; | |
499 | } | |
500 | ||
52ff878c VD |
501 | /** |
502 | * fc_exch_em_alloc() - allocate an exchange from a specified EM. | |
503 | * @lport: ptr to the local port | |
504 | * @mp: ptr to the exchange manager | |
42e9a92f | 505 | * |
d7179680 | 506 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 507 | */ |
52ff878c | 508 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 509 | struct fc_exch_mgr *mp) |
42e9a92f RL |
510 | { |
511 | struct fc_exch *ep; | |
d7179680 VD |
512 | u16 min, max, xid; |
513 | ||
514 | min = mp->min_xid; | |
515 | max = mp->max_xid; | |
42e9a92f RL |
516 | |
517 | /* allocate memory for exchange */ | |
518 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
519 | if (!ep) { | |
520 | atomic_inc(&mp->stats.no_free_exch); | |
521 | goto out; | |
522 | } | |
523 | memset(ep, 0, sizeof(*ep)); | |
524 | ||
525 | spin_lock_bh(&mp->em_lock); | |
d7179680 VD |
526 | xid = mp->next_xid; |
527 | /* alloc a new xid */ | |
528 | while (mp->exches[xid - min]) { | |
529 | xid = (xid == max) ? min : xid + 1; | |
530 | if (xid == mp->next_xid) | |
42e9a92f | 531 | goto err; |
42e9a92f | 532 | } |
d7179680 | 533 | mp->next_xid = (xid == max) ? min : xid + 1; |
42e9a92f RL |
534 | |
535 | fc_exch_hold(ep); /* hold for exch in mp */ | |
536 | spin_lock_init(&ep->ex_lock); | |
537 | /* | |
538 | * Hold exch lock for caller to prevent fc_exch_reset() | |
539 | * from releasing exch while fc_exch_alloc() caller is | |
540 | * still working on exch. | |
541 | */ | |
542 | spin_lock_bh(&ep->ex_lock); | |
543 | ||
544 | mp->exches[xid - mp->min_xid] = ep; | |
545 | list_add_tail(&ep->ex_list, &mp->ex_list); | |
546 | fc_seq_alloc(ep, ep->seq_id++); | |
547 | mp->total_exches++; | |
548 | spin_unlock_bh(&mp->em_lock); | |
549 | ||
550 | /* | |
551 | * update exchange | |
552 | */ | |
553 | ep->oxid = ep->xid = xid; | |
554 | ep->em = mp; | |
52ff878c | 555 | ep->lp = lport; |
42e9a92f RL |
556 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
557 | ep->rxid = FC_XID_UNKNOWN; | |
558 | ep->class = mp->class; | |
559 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); | |
560 | out: | |
561 | return ep; | |
562 | err: | |
563 | spin_unlock_bh(&mp->em_lock); | |
564 | atomic_inc(&mp->stats.no_free_exch_xid); | |
565 | mempool_free(ep, mp->ep_pool); | |
566 | return NULL; | |
567 | } | |
52ff878c VD |
568 | |
569 | /** | |
570 | * fc_exch_alloc() - allocate an exchange. | |
571 | * @lport: ptr to the local port | |
572 | * @fp: ptr to the FC frame | |
573 | * | |
574 | * This function walks the list of the exchange manager(EM) | |
575 | * anchors to select a EM for new exchange allocation. The | |
576 | * EM is selected having either a NULL match function pointer | |
577 | * or call to match function returning true. | |
578 | */ | |
579 | struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp) | |
580 | { | |
581 | struct fc_exch_mgr_anchor *ema; | |
582 | struct fc_exch *ep; | |
583 | ||
584 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
585 | if (!ema->match || ema->match(fp)) { | |
d7179680 | 586 | ep = fc_exch_em_alloc(lport, ema->mp); |
52ff878c VD |
587 | if (ep) |
588 | return ep; | |
589 | } | |
590 | } | |
591 | return NULL; | |
592 | } | |
42e9a92f RL |
593 | EXPORT_SYMBOL(fc_exch_alloc); |
594 | ||
595 | /* | |
596 | * Lookup and hold an exchange. | |
597 | */ | |
598 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
599 | { | |
600 | struct fc_exch *ep = NULL; | |
601 | ||
602 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
603 | spin_lock_bh(&mp->em_lock); | |
604 | ep = mp->exches[xid - mp->min_xid]; | |
605 | if (ep) { | |
606 | fc_exch_hold(ep); | |
607 | WARN_ON(ep->xid != xid); | |
608 | } | |
609 | spin_unlock_bh(&mp->em_lock); | |
610 | } | |
611 | return ep; | |
612 | } | |
613 | ||
614 | void fc_exch_done(struct fc_seq *sp) | |
615 | { | |
616 | struct fc_exch *ep = fc_seq_exch(sp); | |
617 | int rc; | |
618 | ||
619 | spin_lock_bh(&ep->ex_lock); | |
620 | rc = fc_exch_done_locked(ep); | |
621 | spin_unlock_bh(&ep->ex_lock); | |
622 | if (!rc) | |
623 | fc_exch_mgr_delete_ep(ep); | |
624 | } | |
625 | EXPORT_SYMBOL(fc_exch_done); | |
626 | ||
627 | /* | |
628 | * Allocate a new exchange as responder. | |
629 | * Sets the responder ID in the frame header. | |
630 | */ | |
52ff878c VD |
631 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
632 | struct fc_exch_mgr *mp, | |
633 | struct fc_frame *fp) | |
42e9a92f RL |
634 | { |
635 | struct fc_exch *ep; | |
636 | struct fc_frame_header *fh; | |
42e9a92f | 637 | |
52ff878c | 638 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
639 | if (ep) { |
640 | ep->class = fc_frame_class(fp); | |
641 | ||
642 | /* | |
643 | * Set EX_CTX indicating we're responding on this exchange. | |
644 | */ | |
645 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
646 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
647 | fh = fc_frame_header_get(fp); | |
648 | ep->sid = ntoh24(fh->fh_d_id); | |
649 | ep->did = ntoh24(fh->fh_s_id); | |
650 | ep->oid = ep->did; | |
651 | ||
652 | /* | |
653 | * Allocated exchange has placed the XID in the | |
654 | * originator field. Move it to the responder field, | |
655 | * and set the originator XID from the frame. | |
656 | */ | |
657 | ep->rxid = ep->xid; | |
658 | ep->oxid = ntohs(fh->fh_ox_id); | |
659 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
660 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
661 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
662 | ||
42e9a92f | 663 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 664 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
665 | } |
666 | return ep; | |
667 | } | |
668 | ||
669 | /* | |
670 | * Find a sequence for receive where the other end is originating the sequence. | |
671 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold | |
672 | * on the ep that should be released by the caller. | |
673 | */ | |
52ff878c VD |
674 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
675 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 676 | struct fc_frame *fp) |
42e9a92f RL |
677 | { |
678 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
679 | struct fc_exch *ep = NULL; | |
680 | struct fc_seq *sp = NULL; | |
681 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
682 | u32 f_ctl; | |
683 | u16 xid; | |
684 | ||
685 | f_ctl = ntoh24(fh->fh_f_ctl); | |
686 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
687 | ||
688 | /* | |
689 | * Lookup or create the exchange if we will be creating the sequence. | |
690 | */ | |
691 | if (f_ctl & FC_FC_EX_CTX) { | |
692 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
693 | ep = fc_exch_find(mp, xid); | |
694 | if (!ep) { | |
695 | atomic_inc(&mp->stats.xid_not_found); | |
696 | reject = FC_RJT_OX_ID; | |
697 | goto out; | |
698 | } | |
699 | if (ep->rxid == FC_XID_UNKNOWN) | |
700 | ep->rxid = ntohs(fh->fh_rx_id); | |
701 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
702 | reject = FC_RJT_OX_ID; | |
703 | goto rel; | |
704 | } | |
705 | } else { | |
706 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
707 | ||
708 | /* | |
709 | * Special case for MDS issuing an ELS TEST with a | |
710 | * bad rxid of 0. | |
711 | * XXX take this out once we do the proper reject. | |
712 | */ | |
713 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
714 | fc_frame_payload_op(fp) == ELS_TEST) { | |
715 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
716 | xid = FC_XID_UNKNOWN; | |
717 | } | |
718 | ||
719 | /* | |
720 | * new sequence - find the exchange | |
721 | */ | |
722 | ep = fc_exch_find(mp, xid); | |
723 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
724 | if (ep) { | |
725 | atomic_inc(&mp->stats.xid_busy); | |
726 | reject = FC_RJT_RX_ID; | |
727 | goto rel; | |
728 | } | |
52ff878c | 729 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
730 | if (!ep) { |
731 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
732 | goto out; | |
733 | } | |
734 | xid = ep->xid; /* get our XID */ | |
735 | } else if (!ep) { | |
736 | atomic_inc(&mp->stats.xid_not_found); | |
737 | reject = FC_RJT_RX_ID; /* XID not found */ | |
738 | goto out; | |
739 | } | |
740 | } | |
741 | ||
742 | /* | |
743 | * At this point, we have the exchange held. | |
744 | * Find or create the sequence. | |
745 | */ | |
746 | if (fc_sof_is_init(fr_sof(fp))) { | |
747 | sp = fc_seq_start_next(&ep->seq); | |
748 | if (!sp) { | |
749 | reject = FC_RJT_SEQ_XS; /* exchange shortage */ | |
750 | goto rel; | |
751 | } | |
752 | sp->id = fh->fh_seq_id; | |
753 | sp->ssb_stat |= SSB_ST_RESP; | |
754 | } else { | |
755 | sp = &ep->seq; | |
756 | if (sp->id != fh->fh_seq_id) { | |
757 | atomic_inc(&mp->stats.seq_not_found); | |
758 | reject = FC_RJT_SEQ_ID; /* sequence/exch should exist */ | |
759 | goto rel; | |
760 | } | |
761 | } | |
762 | WARN_ON(ep != fc_seq_exch(sp)); | |
763 | ||
764 | if (f_ctl & FC_FC_SEQ_INIT) | |
765 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
766 | ||
767 | fr_seq(fp) = sp; | |
768 | out: | |
769 | return reject; | |
770 | rel: | |
771 | fc_exch_done(&ep->seq); | |
772 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
773 | return reject; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Find the sequence for a frame being received. | |
778 | * We originated the sequence, so it should be found. | |
779 | * We may or may not have originated the exchange. | |
780 | * Does not hold the sequence for the caller. | |
781 | */ | |
782 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
783 | struct fc_frame *fp) | |
784 | { | |
785 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
786 | struct fc_exch *ep; | |
787 | struct fc_seq *sp = NULL; | |
788 | u32 f_ctl; | |
789 | u16 xid; | |
790 | ||
791 | f_ctl = ntoh24(fh->fh_f_ctl); | |
792 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
793 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
794 | ep = fc_exch_find(mp, xid); | |
795 | if (!ep) | |
796 | return NULL; | |
797 | if (ep->seq.id == fh->fh_seq_id) { | |
798 | /* | |
799 | * Save the RX_ID if we didn't previously know it. | |
800 | */ | |
801 | sp = &ep->seq; | |
802 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
803 | ep->rxid == FC_XID_UNKNOWN) { | |
804 | ep->rxid = ntohs(fh->fh_rx_id); | |
805 | } | |
806 | } | |
807 | fc_exch_release(ep); | |
808 | return sp; | |
809 | } | |
810 | ||
811 | /* | |
812 | * Set addresses for an exchange. | |
813 | * Note this must be done before the first sequence of the exchange is sent. | |
814 | */ | |
815 | static void fc_exch_set_addr(struct fc_exch *ep, | |
816 | u32 orig_id, u32 resp_id) | |
817 | { | |
818 | ep->oid = orig_id; | |
819 | if (ep->esb_stat & ESB_ST_RESP) { | |
820 | ep->sid = resp_id; | |
821 | ep->did = orig_id; | |
822 | } else { | |
823 | ep->sid = orig_id; | |
824 | ep->did = resp_id; | |
825 | } | |
826 | } | |
827 | ||
828 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) | |
829 | { | |
830 | struct fc_exch *ep = fc_seq_exch(sp); | |
831 | ||
832 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
7414705e RL |
833 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", |
834 | ep->f_ctl, sp->id); | |
42e9a92f RL |
835 | return sp; |
836 | } | |
837 | /* | |
838 | * Allocate a new sequence on the same exchange as the supplied sequence. | |
839 | * This will never return NULL. | |
840 | */ | |
841 | struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
842 | { | |
843 | struct fc_exch *ep = fc_seq_exch(sp); | |
844 | ||
845 | spin_lock_bh(&ep->ex_lock); | |
42e9a92f RL |
846 | sp = fc_seq_start_next_locked(sp); |
847 | spin_unlock_bh(&ep->ex_lock); | |
848 | ||
849 | return sp; | |
850 | } | |
851 | EXPORT_SYMBOL(fc_seq_start_next); | |
852 | ||
853 | int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp) | |
854 | { | |
855 | struct fc_exch *ep; | |
856 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
857 | int error; | |
858 | u32 f_ctl; | |
859 | ||
860 | ep = fc_seq_exch(sp); | |
861 | WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT); | |
862 | ||
863 | f_ctl = ntoh24(fh->fh_f_ctl); | |
864 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
865 | ||
866 | /* | |
867 | * update sequence count if this frame is carrying | |
868 | * multiple FC frames when sequence offload is enabled | |
869 | * by LLD. | |
870 | */ | |
871 | if (fr_max_payload(fp)) | |
872 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
873 | fr_max_payload(fp)); | |
874 | else | |
875 | sp->cnt++; | |
876 | ||
877 | /* | |
878 | * Send the frame. | |
879 | */ | |
880 | error = lp->tt.frame_send(lp, fp); | |
881 | ||
882 | /* | |
883 | * Update the exchange and sequence flags, | |
884 | * assuming all frames for the sequence have been sent. | |
885 | * We can only be called to send once for each sequence. | |
886 | */ | |
887 | spin_lock_bh(&ep->ex_lock); | |
888 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ | |
889 | if (f_ctl & (FC_FC_END_SEQ | FC_FC_SEQ_INIT)) | |
890 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
891 | spin_unlock_bh(&ep->ex_lock); | |
892 | return error; | |
893 | } | |
894 | EXPORT_SYMBOL(fc_seq_send); | |
895 | ||
896 | void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, | |
897 | struct fc_seq_els_data *els_data) | |
898 | { | |
899 | switch (els_cmd) { | |
900 | case ELS_LS_RJT: | |
901 | fc_seq_ls_rjt(sp, els_data->reason, els_data->explan); | |
902 | break; | |
903 | case ELS_LS_ACC: | |
904 | fc_seq_ls_acc(sp); | |
905 | break; | |
906 | case ELS_RRQ: | |
907 | fc_exch_els_rrq(sp, els_data->fp); | |
908 | break; | |
909 | case ELS_REC: | |
910 | fc_exch_els_rec(sp, els_data->fp); | |
911 | break; | |
912 | default: | |
7414705e | 913 | FC_EXCH_DBG(fc_seq_exch(sp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
914 | } |
915 | } | |
916 | EXPORT_SYMBOL(fc_seq_els_rsp_send); | |
917 | ||
918 | /* | |
919 | * Send a sequence, which is also the last sequence in the exchange. | |
920 | */ | |
921 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
922 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
923 | { | |
924 | u32 f_ctl; | |
925 | struct fc_exch *ep = fc_seq_exch(sp); | |
926 | ||
927 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
928 | f_ctl |= ep->f_ctl; | |
929 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
930 | fc_seq_send(ep->lp, sp, fp); | |
931 | } | |
932 | ||
933 | /* | |
934 | * Send ACK_1 (or equiv.) indicating we received something. | |
935 | * The frame we're acking is supplied. | |
936 | */ | |
937 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
938 | { | |
939 | struct fc_frame *fp; | |
940 | struct fc_frame_header *rx_fh; | |
941 | struct fc_frame_header *fh; | |
942 | struct fc_exch *ep = fc_seq_exch(sp); | |
943 | struct fc_lport *lp = ep->lp; | |
944 | unsigned int f_ctl; | |
945 | ||
946 | /* | |
947 | * Don't send ACKs for class 3. | |
948 | */ | |
949 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
950 | fp = fc_frame_alloc(lp, 0); | |
951 | if (!fp) | |
952 | return; | |
953 | ||
954 | fh = fc_frame_header_get(fp); | |
955 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
956 | fh->fh_type = FC_TYPE_BLS; | |
957 | ||
958 | /* | |
959 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
960 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
961 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
962 | * Last ACK uses bits 7-6 (continue sequence), | |
963 | * bits 5-4 are meaningful (what kind of ACK to use). | |
964 | */ | |
965 | rx_fh = fc_frame_header_get(rx_fp); | |
966 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
967 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
968 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
969 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
970 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
971 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
972 | hton24(fh->fh_f_ctl, f_ctl); | |
973 | ||
974 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
975 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
976 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
977 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
978 | ||
979 | fr_sof(fp) = fr_sof(rx_fp); | |
980 | if (f_ctl & FC_FC_END_SEQ) | |
981 | fr_eof(fp) = FC_EOF_T; | |
982 | else | |
983 | fr_eof(fp) = FC_EOF_N; | |
984 | ||
985 | (void) lp->tt.frame_send(lp, fp); | |
986 | } | |
987 | } | |
988 | ||
989 | /* | |
990 | * Send BLS Reject. | |
991 | * This is for rejecting BA_ABTS only. | |
992 | */ | |
b2ab99c9 RL |
993 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
994 | enum fc_ba_rjt_reason reason, | |
995 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
996 | { |
997 | struct fc_frame *fp; | |
998 | struct fc_frame_header *rx_fh; | |
999 | struct fc_frame_header *fh; | |
1000 | struct fc_ba_rjt *rp; | |
1001 | struct fc_lport *lp; | |
1002 | unsigned int f_ctl; | |
1003 | ||
1004 | lp = fr_dev(rx_fp); | |
1005 | fp = fc_frame_alloc(lp, sizeof(*rp)); | |
1006 | if (!fp) | |
1007 | return; | |
1008 | fh = fc_frame_header_get(fp); | |
1009 | rx_fh = fc_frame_header_get(rx_fp); | |
1010 | ||
1011 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1012 | ||
1013 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1014 | rp->br_reason = reason; | |
1015 | rp->br_explan = explan; | |
1016 | ||
1017 | /* | |
1018 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1019 | */ | |
1020 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1021 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1022 | fh->fh_ox_id = rx_fh->fh_rx_id; | |
1023 | fh->fh_rx_id = rx_fh->fh_ox_id; | |
1024 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1025 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1026 | fh->fh_type = FC_TYPE_BLS; | |
1027 | ||
1028 | /* | |
1029 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1030 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1031 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1032 | * Last ACK uses bits 7-6 (continue sequence), | |
1033 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1034 | * Always set LAST_SEQ, END_SEQ. | |
1035 | */ | |
1036 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1037 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1038 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1039 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1040 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1041 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1042 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1043 | hton24(fh->fh_f_ctl, f_ctl); | |
1044 | ||
1045 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1046 | fr_eof(fp) = FC_EOF_T; | |
1047 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1048 | fr_eof(fp) = FC_EOF_N; | |
1049 | ||
1050 | (void) lp->tt.frame_send(lp, fp); | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Handle an incoming ABTS. This would be for target mode usually, | |
1055 | * but could be due to lost FCP transfer ready, confirm or RRQ. | |
1056 | * We always handle this as an exchange abort, ignoring the parameter. | |
1057 | */ | |
1058 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1059 | { | |
1060 | struct fc_frame *fp; | |
1061 | struct fc_ba_acc *ap; | |
1062 | struct fc_frame_header *fh; | |
1063 | struct fc_seq *sp; | |
1064 | ||
1065 | if (!ep) | |
1066 | goto reject; | |
1067 | spin_lock_bh(&ep->ex_lock); | |
1068 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1069 | spin_unlock_bh(&ep->ex_lock); | |
1070 | goto reject; | |
1071 | } | |
1072 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) | |
1073 | fc_exch_hold(ep); /* hold for REC_QUAL */ | |
1074 | ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL; | |
1075 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1076 | ||
1077 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1078 | if (!fp) { | |
1079 | spin_unlock_bh(&ep->ex_lock); | |
1080 | goto free; | |
1081 | } | |
1082 | fh = fc_frame_header_get(fp); | |
1083 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1084 | memset(ap, 0, sizeof(*ap)); | |
1085 | sp = &ep->seq; | |
1086 | ap->ba_high_seq_cnt = htons(0xffff); | |
1087 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1088 | ap->ba_seq_id = sp->id; | |
1089 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1090 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1091 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1092 | } | |
a7e84f2b | 1093 | sp = fc_seq_start_next_locked(sp); |
42e9a92f RL |
1094 | spin_unlock_bh(&ep->ex_lock); |
1095 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); | |
1096 | fc_frame_free(rx_fp); | |
1097 | return; | |
1098 | ||
1099 | reject: | |
1100 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
1101 | free: | |
1102 | fc_frame_free(rx_fp); | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Handle receive where the other end is originating the sequence. | |
1107 | */ | |
1108 | static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp, | |
1109 | struct fc_frame *fp) | |
1110 | { | |
1111 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1112 | struct fc_seq *sp = NULL; | |
1113 | struct fc_exch *ep = NULL; | |
1114 | enum fc_sof sof; | |
1115 | enum fc_eof eof; | |
1116 | u32 f_ctl; | |
1117 | enum fc_pf_rjt_reason reject; | |
1118 | ||
1119 | fr_seq(fp) = NULL; | |
52ff878c | 1120 | reject = fc_seq_lookup_recip(lp, mp, fp); |
42e9a92f RL |
1121 | if (reject == FC_RJT_NONE) { |
1122 | sp = fr_seq(fp); /* sequence will be held */ | |
1123 | ep = fc_seq_exch(sp); | |
1124 | sof = fr_sof(fp); | |
1125 | eof = fr_eof(fp); | |
1126 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1127 | fc_seq_send_ack(sp, fp); | |
1128 | ||
1129 | /* | |
1130 | * Call the receive function. | |
1131 | * | |
1132 | * The receive function may allocate a new sequence | |
1133 | * over the old one, so we shouldn't change the | |
1134 | * sequence after this. | |
1135 | * | |
1136 | * The frame will be freed by the receive function. | |
1137 | * If new exch resp handler is valid then call that | |
1138 | * first. | |
1139 | */ | |
1140 | if (ep->resp) | |
1141 | ep->resp(sp, fp, ep->arg); | |
1142 | else | |
1143 | lp->tt.lport_recv(lp, sp, fp); | |
1144 | fc_exch_release(ep); /* release from lookup */ | |
1145 | } else { | |
d459b7ea | 1146 | FC_LPORT_DBG(lp, "exch/seq lookup failed: reject %x\n", reject); |
42e9a92f RL |
1147 | fc_frame_free(fp); |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Handle receive where the other end is originating the sequence in | |
1153 | * response to our exchange. | |
1154 | */ | |
1155 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1156 | { | |
1157 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1158 | struct fc_seq *sp; | |
1159 | struct fc_exch *ep; | |
1160 | enum fc_sof sof; | |
1161 | u32 f_ctl; | |
1162 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1163 | void *ex_resp_arg; | |
1164 | int rc; | |
1165 | ||
1166 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1167 | if (!ep) { | |
1168 | atomic_inc(&mp->stats.xid_not_found); | |
1169 | goto out; | |
1170 | } | |
30121d14 SM |
1171 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1172 | atomic_inc(&mp->stats.xid_not_found); | |
1173 | goto out; | |
1174 | } | |
42e9a92f RL |
1175 | if (ep->rxid == FC_XID_UNKNOWN) |
1176 | ep->rxid = ntohs(fh->fh_rx_id); | |
1177 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1178 | atomic_inc(&mp->stats.xid_not_found); | |
1179 | goto rel; | |
1180 | } | |
1181 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1182 | ep->did != FC_FID_FLOGI) { | |
1183 | atomic_inc(&mp->stats.xid_not_found); | |
1184 | goto rel; | |
1185 | } | |
1186 | sof = fr_sof(fp); | |
1187 | if (fc_sof_is_init(sof)) { | |
1188 | sp = fc_seq_start_next(&ep->seq); | |
1189 | sp->id = fh->fh_seq_id; | |
1190 | sp->ssb_stat |= SSB_ST_RESP; | |
1191 | } else { | |
1192 | sp = &ep->seq; | |
1193 | if (sp->id != fh->fh_seq_id) { | |
1194 | atomic_inc(&mp->stats.seq_not_found); | |
1195 | goto rel; | |
1196 | } | |
1197 | } | |
1198 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1199 | fr_seq(fp) = sp; | |
1200 | if (f_ctl & FC_FC_SEQ_INIT) | |
1201 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1202 | ||
1203 | if (fc_sof_needs_ack(sof)) | |
1204 | fc_seq_send_ack(sp, fp); | |
1205 | resp = ep->resp; | |
1206 | ex_resp_arg = ep->arg; | |
1207 | ||
1208 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1209 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1210 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1211 | spin_lock_bh(&ep->ex_lock); | |
1212 | rc = fc_exch_done_locked(ep); | |
1213 | WARN_ON(fc_seq_exch(sp) != ep); | |
1214 | spin_unlock_bh(&ep->ex_lock); | |
1215 | if (!rc) | |
1216 | fc_exch_mgr_delete_ep(ep); | |
1217 | } | |
1218 | ||
1219 | /* | |
1220 | * Call the receive function. | |
1221 | * The sequence is held (has a refcnt) for us, | |
1222 | * but not for the receive function. | |
1223 | * | |
1224 | * The receive function may allocate a new sequence | |
1225 | * over the old one, so we shouldn't change the | |
1226 | * sequence after this. | |
1227 | * | |
1228 | * The frame will be freed by the receive function. | |
1229 | * If new exch resp handler is valid then call that | |
1230 | * first. | |
1231 | */ | |
1232 | if (resp) | |
1233 | resp(sp, fp, ex_resp_arg); | |
1234 | else | |
1235 | fc_frame_free(fp); | |
1236 | fc_exch_release(ep); | |
1237 | return; | |
1238 | rel: | |
1239 | fc_exch_release(ep); | |
1240 | out: | |
1241 | fc_frame_free(fp); | |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | * Handle receive for a sequence where other end is responding to our sequence. | |
1246 | */ | |
1247 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1248 | { | |
1249 | struct fc_seq *sp; | |
1250 | ||
1251 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1252 | |
1253 | if (!sp) | |
42e9a92f | 1254 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1255 | else |
42e9a92f | 1256 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1257 | |
42e9a92f RL |
1258 | fc_frame_free(fp); |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Handle the response to an ABTS for exchange or sequence. | |
1263 | * This can be BA_ACC or BA_RJT. | |
1264 | */ | |
1265 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1266 | { | |
1267 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1268 | void *ex_resp_arg; | |
1269 | struct fc_frame_header *fh; | |
1270 | struct fc_ba_acc *ap; | |
1271 | struct fc_seq *sp; | |
1272 | u16 low; | |
1273 | u16 high; | |
1274 | int rc = 1, has_rec = 0; | |
1275 | ||
1276 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1277 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1278 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1279 | |
1280 | if (cancel_delayed_work_sync(&ep->timeout_work)) | |
1281 | fc_exch_release(ep); /* release from pending timer hold */ | |
1282 | ||
1283 | spin_lock_bh(&ep->ex_lock); | |
1284 | switch (fh->fh_r_ctl) { | |
1285 | case FC_RCTL_BA_ACC: | |
1286 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1287 | if (!ap) | |
1288 | break; | |
1289 | ||
1290 | /* | |
1291 | * Decide whether to establish a Recovery Qualifier. | |
1292 | * We do this if there is a non-empty SEQ_CNT range and | |
1293 | * SEQ_ID is the same as the one we aborted. | |
1294 | */ | |
1295 | low = ntohs(ap->ba_low_seq_cnt); | |
1296 | high = ntohs(ap->ba_high_seq_cnt); | |
1297 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1298 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1299 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1300 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1301 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1302 | has_rec = 1; | |
1303 | } | |
1304 | break; | |
1305 | case FC_RCTL_BA_RJT: | |
1306 | break; | |
1307 | default: | |
1308 | break; | |
1309 | } | |
1310 | ||
1311 | resp = ep->resp; | |
1312 | ex_resp_arg = ep->arg; | |
1313 | ||
1314 | /* do we need to do some other checks here. Can we reuse more of | |
1315 | * fc_exch_recv_seq_resp | |
1316 | */ | |
1317 | sp = &ep->seq; | |
1318 | /* | |
1319 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1320 | */ | |
1321 | if (ep->fh_type != FC_TYPE_FCP && | |
1322 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1323 | rc = fc_exch_done_locked(ep); | |
1324 | spin_unlock_bh(&ep->ex_lock); | |
1325 | if (!rc) | |
1326 | fc_exch_mgr_delete_ep(ep); | |
1327 | ||
1328 | if (resp) | |
1329 | resp(sp, fp, ex_resp_arg); | |
1330 | else | |
1331 | fc_frame_free(fp); | |
1332 | ||
1333 | if (has_rec) | |
1334 | fc_exch_timer_set(ep, ep->r_a_tov); | |
1335 | ||
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Receive BLS sequence. | |
1340 | * This is always a sequence initiated by the remote side. | |
1341 | * We may be either the originator or recipient of the exchange. | |
1342 | */ | |
1343 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1344 | { | |
1345 | struct fc_frame_header *fh; | |
1346 | struct fc_exch *ep; | |
1347 | u32 f_ctl; | |
1348 | ||
1349 | fh = fc_frame_header_get(fp); | |
1350 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1351 | fr_seq(fp) = NULL; | |
1352 | ||
1353 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1354 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1355 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1356 | spin_lock_bh(&ep->ex_lock); | |
1357 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1358 | spin_unlock_bh(&ep->ex_lock); | |
1359 | } | |
1360 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1361 | /* | |
1362 | * A response to a sequence we initiated. | |
1363 | * This should only be ACKs for class 2 or F. | |
1364 | */ | |
1365 | switch (fh->fh_r_ctl) { | |
1366 | case FC_RCTL_ACK_1: | |
1367 | case FC_RCTL_ACK_0: | |
1368 | break; | |
1369 | default: | |
7414705e RL |
1370 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received", |
1371 | fh->fh_r_ctl, | |
1372 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1373 | break; |
1374 | } | |
1375 | fc_frame_free(fp); | |
1376 | } else { | |
1377 | switch (fh->fh_r_ctl) { | |
1378 | case FC_RCTL_BA_RJT: | |
1379 | case FC_RCTL_BA_ACC: | |
1380 | if (ep) | |
1381 | fc_exch_abts_resp(ep, fp); | |
1382 | else | |
1383 | fc_frame_free(fp); | |
1384 | break; | |
1385 | case FC_RCTL_BA_ABTS: | |
1386 | fc_exch_recv_abts(ep, fp); | |
1387 | break; | |
1388 | default: /* ignore junk */ | |
1389 | fc_frame_free(fp); | |
1390 | break; | |
1391 | } | |
1392 | } | |
1393 | if (ep) | |
1394 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * Accept sequence with LS_ACC. | |
1399 | * If this fails due to allocation or transmit congestion, assume the | |
1400 | * originator will repeat the sequence. | |
1401 | */ | |
1402 | static void fc_seq_ls_acc(struct fc_seq *req_sp) | |
1403 | { | |
1404 | struct fc_seq *sp; | |
1405 | struct fc_els_ls_acc *acc; | |
1406 | struct fc_frame *fp; | |
1407 | ||
1408 | sp = fc_seq_start_next(req_sp); | |
1409 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc)); | |
1410 | if (fp) { | |
1411 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1412 | memset(acc, 0, sizeof(*acc)); | |
1413 | acc->la_cmd = ELS_LS_ACC; | |
1414 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * Reject sequence with ELS LS_RJT. | |
1420 | * If this fails due to allocation or transmit congestion, assume the | |
1421 | * originator will repeat the sequence. | |
1422 | */ | |
1423 | static void fc_seq_ls_rjt(struct fc_seq *req_sp, enum fc_els_rjt_reason reason, | |
1424 | enum fc_els_rjt_explan explan) | |
1425 | { | |
1426 | struct fc_seq *sp; | |
1427 | struct fc_els_ls_rjt *rjt; | |
1428 | struct fc_frame *fp; | |
1429 | ||
1430 | sp = fc_seq_start_next(req_sp); | |
1431 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*rjt)); | |
1432 | if (fp) { | |
1433 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1434 | memset(rjt, 0, sizeof(*rjt)); | |
1435 | rjt->er_cmd = ELS_LS_RJT; | |
1436 | rjt->er_reason = reason; | |
1437 | rjt->er_explan = explan; | |
1438 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | static void fc_exch_reset(struct fc_exch *ep) | |
1443 | { | |
1444 | struct fc_seq *sp; | |
1445 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
1446 | void *arg; | |
1447 | int rc = 1; | |
1448 | ||
1449 | spin_lock_bh(&ep->ex_lock); | |
1450 | ep->state |= FC_EX_RST_CLEANUP; | |
1451 | /* | |
1452 | * we really want to call del_timer_sync, but cannot due | |
1453 | * to the lport calling with the lport lock held (some resp | |
1454 | * functions can also grab the lport lock which could cause | |
1455 | * a deadlock). | |
1456 | */ | |
1457 | if (cancel_delayed_work(&ep->timeout_work)) | |
1458 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
1459 | resp = ep->resp; | |
1460 | ep->resp = NULL; | |
1461 | if (ep->esb_stat & ESB_ST_REC_QUAL) | |
1462 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1463 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1464 | arg = ep->arg; | |
1465 | sp = &ep->seq; | |
1466 | rc = fc_exch_done_locked(ep); | |
1467 | spin_unlock_bh(&ep->ex_lock); | |
1468 | if (!rc) | |
1469 | fc_exch_mgr_delete_ep(ep); | |
1470 | ||
1471 | if (resp) | |
1472 | resp(sp, ERR_PTR(-FC_EX_CLOSED), arg); | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Reset an exchange manager, releasing all sequences and exchanges. | |
1477 | * If sid is non-zero, reset only exchanges we source from that FID. | |
1478 | * If did is non-zero, reset only exchanges destined to that FID. | |
1479 | */ | |
1f6ff364 | 1480 | void fc_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did) |
42e9a92f RL |
1481 | { |
1482 | struct fc_exch *ep; | |
1483 | struct fc_exch *next; | |
52ff878c VD |
1484 | struct fc_exch_mgr *mp; |
1485 | struct fc_exch_mgr_anchor *ema; | |
42e9a92f | 1486 | |
52ff878c VD |
1487 | list_for_each_entry(ema, &lp->ema_list, ema_list) { |
1488 | mp = ema->mp; | |
1489 | spin_lock_bh(&mp->em_lock); | |
42e9a92f | 1490 | restart: |
52ff878c VD |
1491 | list_for_each_entry_safe(ep, next, &mp->ex_list, ex_list) { |
1492 | if ((lp == ep->lp) && | |
1493 | (sid == 0 || sid == ep->sid) && | |
1494 | (did == 0 || did == ep->did)) { | |
1495 | fc_exch_hold(ep); | |
1496 | spin_unlock_bh(&mp->em_lock); | |
1497 | ||
1498 | fc_exch_reset(ep); | |
1499 | ||
1500 | fc_exch_release(ep); | |
1501 | spin_lock_bh(&mp->em_lock); | |
1502 | ||
1503 | /* | |
1504 | * must restart loop incase while lock | |
1505 | * was down multiple eps were released. | |
1506 | */ | |
1507 | goto restart; | |
1508 | } | |
42e9a92f | 1509 | } |
52ff878c | 1510 | spin_unlock_bh(&mp->em_lock); |
42e9a92f | 1511 | } |
42e9a92f RL |
1512 | } |
1513 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1514 | ||
1515 | /* | |
1516 | * Handle incoming ELS REC - Read Exchange Concise. | |
1517 | * Note that the requesting port may be different than the S_ID in the request. | |
1518 | */ | |
1519 | static void fc_exch_els_rec(struct fc_seq *sp, struct fc_frame *rfp) | |
1520 | { | |
1521 | struct fc_frame *fp; | |
1522 | struct fc_exch *ep; | |
1523 | struct fc_exch_mgr *em; | |
1524 | struct fc_els_rec *rp; | |
1525 | struct fc_els_rec_acc *acc; | |
1526 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1527 | enum fc_els_rjt_explan explan; | |
1528 | u32 sid; | |
1529 | u16 rxid; | |
1530 | u16 oxid; | |
1531 | ||
1532 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); | |
1533 | explan = ELS_EXPL_INV_LEN; | |
1534 | if (!rp) | |
1535 | goto reject; | |
1536 | sid = ntoh24(rp->rec_s_id); | |
1537 | rxid = ntohs(rp->rec_rx_id); | |
1538 | oxid = ntohs(rp->rec_ox_id); | |
1539 | ||
1540 | /* | |
1541 | * Currently it's hard to find the local S_ID from the exchange | |
1542 | * manager. This will eventually be fixed, but for now it's easier | |
1543 | * to lookup the subject exchange twice, once as if we were | |
1544 | * the initiator, and then again if we weren't. | |
1545 | */ | |
1546 | em = fc_seq_exch(sp)->em; | |
1547 | ep = fc_exch_find(em, oxid); | |
1548 | explan = ELS_EXPL_OXID_RXID; | |
1549 | if (ep && ep->oid == sid) { | |
1550 | if (ep->rxid != FC_XID_UNKNOWN && | |
1551 | rxid != FC_XID_UNKNOWN && | |
1552 | ep->rxid != rxid) | |
1553 | goto rel; | |
1554 | } else { | |
1555 | if (ep) | |
1556 | fc_exch_release(ep); | |
1557 | ep = NULL; | |
1558 | if (rxid != FC_XID_UNKNOWN) | |
1559 | ep = fc_exch_find(em, rxid); | |
1560 | if (!ep) | |
1561 | goto reject; | |
1562 | } | |
1563 | ||
1564 | fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc)); | |
1565 | if (!fp) { | |
1566 | fc_exch_done(sp); | |
1567 | goto out; | |
1568 | } | |
1569 | sp = fc_seq_start_next(sp); | |
1570 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1571 | memset(acc, 0, sizeof(*acc)); | |
1572 | acc->reca_cmd = ELS_LS_ACC; | |
1573 | acc->reca_ox_id = rp->rec_ox_id; | |
1574 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1575 | acc->reca_rx_id = htons(ep->rxid); | |
1576 | if (ep->sid == ep->oid) | |
1577 | hton24(acc->reca_rfid, ep->did); | |
1578 | else | |
1579 | hton24(acc->reca_rfid, ep->sid); | |
1580 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1581 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1582 | ESB_ST_SEQ_INIT | | |
1583 | ESB_ST_COMPLETE)); | |
1584 | sp = fc_seq_start_next(sp); | |
1585 | fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS); | |
1586 | out: | |
1587 | fc_exch_release(ep); | |
1588 | fc_frame_free(rfp); | |
1589 | return; | |
1590 | ||
1591 | rel: | |
1592 | fc_exch_release(ep); | |
1593 | reject: | |
1594 | fc_seq_ls_rjt(sp, reason, explan); | |
1595 | fc_frame_free(rfp); | |
1596 | } | |
1597 | ||
1598 | /* | |
1599 | * Handle response from RRQ. | |
1600 | * Not much to do here, really. | |
1601 | * Should report errors. | |
1602 | * | |
1603 | * TODO: fix error handler. | |
1604 | */ | |
1605 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
1606 | { | |
1607 | struct fc_exch *aborted_ep = arg; | |
1608 | unsigned int op; | |
1609 | ||
1610 | if (IS_ERR(fp)) { | |
1611 | int err = PTR_ERR(fp); | |
1612 | ||
78342da3 | 1613 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 1614 | goto cleanup; |
7414705e RL |
1615 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
1616 | "frame error %d\n", err); | |
42e9a92f RL |
1617 | return; |
1618 | } | |
1619 | ||
1620 | op = fc_frame_payload_op(fp); | |
1621 | fc_frame_free(fp); | |
1622 | ||
1623 | switch (op) { | |
1624 | case ELS_LS_RJT: | |
7414705e | 1625 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ"); |
42e9a92f RL |
1626 | /* fall through */ |
1627 | case ELS_LS_ACC: | |
1628 | goto cleanup; | |
1629 | default: | |
7414705e RL |
1630 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x " |
1631 | "for RRQ", op); | |
42e9a92f RL |
1632 | return; |
1633 | } | |
1634 | ||
1635 | cleanup: | |
1636 | fc_exch_done(&aborted_ep->seq); | |
1637 | /* drop hold for rec qual */ | |
1638 | fc_exch_release(aborted_ep); | |
1639 | } | |
1640 | ||
1641 | /* | |
1642 | * Send ELS RRQ - Reinstate Recovery Qualifier. | |
1643 | * This tells the remote port to stop blocking the use of | |
1644 | * the exchange and the seq_cnt range. | |
1645 | */ | |
1646 | static void fc_exch_rrq(struct fc_exch *ep) | |
1647 | { | |
1648 | struct fc_lport *lp; | |
1649 | struct fc_els_rrq *rrq; | |
1650 | struct fc_frame *fp; | |
42e9a92f RL |
1651 | u32 did; |
1652 | ||
1653 | lp = ep->lp; | |
1654 | ||
1655 | fp = fc_frame_alloc(lp, sizeof(*rrq)); | |
1656 | if (!fp) | |
a0cc1ecc VD |
1657 | goto retry; |
1658 | ||
42e9a92f RL |
1659 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
1660 | memset(rrq, 0, sizeof(*rrq)); | |
1661 | rrq->rrq_cmd = ELS_RRQ; | |
1662 | hton24(rrq->rrq_s_id, ep->sid); | |
1663 | rrq->rrq_ox_id = htons(ep->oxid); | |
1664 | rrq->rrq_rx_id = htons(ep->rxid); | |
1665 | ||
1666 | did = ep->did; | |
1667 | if (ep->esb_stat & ESB_ST_RESP) | |
1668 | did = ep->sid; | |
1669 | ||
1670 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
1671 | fc_host_port_id(lp->host), FC_TYPE_ELS, | |
1672 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
1673 | ||
a0cc1ecc VD |
1674 | if (fc_exch_seq_send(lp, fp, fc_exch_rrq_resp, NULL, ep, lp->e_d_tov)) |
1675 | return; | |
1676 | ||
1677 | retry: | |
1678 | spin_lock_bh(&ep->ex_lock); | |
1679 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
1680 | spin_unlock_bh(&ep->ex_lock); | |
1681 | /* drop hold for rec qual */ | |
1682 | fc_exch_release(ep); | |
42e9a92f RL |
1683 | return; |
1684 | } | |
a0cc1ecc VD |
1685 | ep->esb_stat |= ESB_ST_REC_QUAL; |
1686 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1687 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
1688 | } |
1689 | ||
1690 | ||
1691 | /* | |
1692 | * Handle incoming ELS RRQ - Reset Recovery Qualifier. | |
1693 | */ | |
1694 | static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp) | |
1695 | { | |
1696 | struct fc_exch *ep; /* request or subject exchange */ | |
1697 | struct fc_els_rrq *rp; | |
1698 | u32 sid; | |
1699 | u16 xid; | |
1700 | enum fc_els_rjt_explan explan; | |
1701 | ||
1702 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1703 | explan = ELS_EXPL_INV_LEN; | |
1704 | if (!rp) | |
1705 | goto reject; | |
1706 | ||
1707 | /* | |
1708 | * lookup subject exchange. | |
1709 | */ | |
1710 | ep = fc_seq_exch(sp); | |
1711 | sid = ntoh24(rp->rrq_s_id); /* subject source */ | |
1712 | xid = ep->did == sid ? ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
1713 | ep = fc_exch_find(ep->em, xid); | |
1714 | ||
1715 | explan = ELS_EXPL_OXID_RXID; | |
1716 | if (!ep) | |
1717 | goto reject; | |
1718 | spin_lock_bh(&ep->ex_lock); | |
1719 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
1720 | goto unlock_reject; | |
1721 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
1722 | ep->rxid != FC_XID_UNKNOWN) | |
1723 | goto unlock_reject; | |
1724 | explan = ELS_EXPL_SID; | |
1725 | if (ep->sid != sid) | |
1726 | goto unlock_reject; | |
1727 | ||
1728 | /* | |
1729 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
1730 | */ | |
1731 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
1732 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1733 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
1734 | } | |
1735 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1736 | if (cancel_delayed_work(&ep->timeout_work)) | |
1737 | atomic_dec(&ep->ex_refcnt); /* drop timer hold */ | |
1738 | } | |
1739 | ||
1740 | spin_unlock_bh(&ep->ex_lock); | |
1741 | ||
1742 | /* | |
1743 | * Send LS_ACC. | |
1744 | */ | |
1745 | fc_seq_ls_acc(sp); | |
1746 | fc_frame_free(fp); | |
1747 | return; | |
1748 | ||
1749 | unlock_reject: | |
1750 | spin_unlock_bh(&ep->ex_lock); | |
1751 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
1752 | reject: | |
1753 | fc_seq_ls_rjt(sp, ELS_RJT_LOGIC, explan); | |
1754 | fc_frame_free(fp); | |
1755 | } | |
1756 | ||
96316099 VD |
1757 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
1758 | struct fc_exch_mgr *mp, | |
1759 | bool (*match)(struct fc_frame *)) | |
1760 | { | |
1761 | struct fc_exch_mgr_anchor *ema; | |
1762 | ||
1763 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
1764 | if (!ema) | |
1765 | return ema; | |
1766 | ||
1767 | ema->mp = mp; | |
1768 | ema->match = match; | |
1769 | /* add EM anchor to EM anchors list */ | |
1770 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
1771 | kref_get(&mp->kref); | |
1772 | return ema; | |
1773 | } | |
1774 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
1775 | ||
1776 | static void fc_exch_mgr_destroy(struct kref *kref) | |
1777 | { | |
1778 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
1779 | ||
1780 | /* | |
1781 | * The total exch count must be zero | |
1782 | * before freeing exchange manager. | |
1783 | */ | |
1784 | WARN_ON(mp->total_exches != 0); | |
1785 | mempool_destroy(mp->ep_pool); | |
e4bc50be | 1786 | free_percpu(mp->pool); |
96316099 VD |
1787 | kfree(mp); |
1788 | } | |
1789 | ||
1790 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) | |
1791 | { | |
1792 | /* remove EM anchor from EM anchors list */ | |
1793 | list_del(&ema->ema_list); | |
1794 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
1795 | kfree(ema); | |
1796 | } | |
1797 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
1798 | ||
42e9a92f RL |
1799 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp, |
1800 | enum fc_class class, | |
52ff878c VD |
1801 | u16 min_xid, u16 max_xid, |
1802 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
1803 | { |
1804 | struct fc_exch_mgr *mp; | |
1805 | size_t len; | |
e4bc50be VD |
1806 | u16 pool_exch_range; |
1807 | size_t pool_size; | |
1808 | unsigned int cpu; | |
1809 | struct fc_exch_pool *pool; | |
42e9a92f | 1810 | |
e4bc50be VD |
1811 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
1812 | (min_xid & fc_cpu_mask) != 0) { | |
7414705e RL |
1813 | FC_LPORT_DBG(lp, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
1814 | min_xid, max_xid); | |
42e9a92f RL |
1815 | return NULL; |
1816 | } | |
1817 | ||
1818 | /* | |
1819 | * Memory need for EM | |
1820 | */ | |
42e9a92f RL |
1821 | len = (max_xid - min_xid + 1) * (sizeof(struct fc_exch *)); |
1822 | len += sizeof(struct fc_exch_mgr); | |
1823 | ||
1824 | mp = kzalloc(len, GFP_ATOMIC); | |
1825 | if (!mp) | |
1826 | return NULL; | |
1827 | ||
1828 | mp->class = class; | |
1829 | mp->total_exches = 0; | |
1830 | mp->exches = (struct fc_exch **)(mp + 1); | |
42e9a92f RL |
1831 | /* adjust em exch xid range for offload */ |
1832 | mp->min_xid = min_xid; | |
1833 | mp->max_xid = max_xid; | |
d7179680 | 1834 | mp->next_xid = min_xid; |
42e9a92f RL |
1835 | |
1836 | INIT_LIST_HEAD(&mp->ex_list); | |
1837 | spin_lock_init(&mp->em_lock); | |
1838 | ||
1839 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
1840 | if (!mp->ep_pool) | |
1841 | goto free_mp; | |
1842 | ||
e4bc50be VD |
1843 | /* |
1844 | * Setup per cpu exch pool with entire exchange id range equally | |
1845 | * divided across all cpus. The exch pointers array memory is | |
1846 | * allocated for exch range per pool. | |
1847 | */ | |
1848 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / (fc_cpu_mask + 1); | |
1849 | mp->pool_max_index = pool_exch_range - 1; | |
1850 | ||
1851 | /* | |
1852 | * Allocate and initialize per cpu exch pool | |
1853 | */ | |
1854 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
1855 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
1856 | if (!mp->pool) | |
1857 | goto free_mempool; | |
1858 | for_each_possible_cpu(cpu) { | |
1859 | pool = per_cpu_ptr(mp->pool, cpu); | |
1860 | spin_lock_init(&pool->lock); | |
1861 | INIT_LIST_HEAD(&pool->ex_list); | |
1862 | } | |
1863 | ||
52ff878c VD |
1864 | kref_init(&mp->kref); |
1865 | if (!fc_exch_mgr_add(lp, mp, match)) { | |
e4bc50be VD |
1866 | free_percpu(mp->pool); |
1867 | goto free_mempool; | |
52ff878c VD |
1868 | } |
1869 | ||
1870 | /* | |
1871 | * Above kref_init() sets mp->kref to 1 and then | |
1872 | * call to fc_exch_mgr_add incremented mp->kref again, | |
1873 | * so adjust that extra increment. | |
1874 | */ | |
1875 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
1876 | return mp; |
1877 | ||
e4bc50be VD |
1878 | free_mempool: |
1879 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
1880 | free_mp: |
1881 | kfree(mp); | |
1882 | return NULL; | |
1883 | } | |
1884 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
1885 | ||
52ff878c | 1886 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 1887 | { |
52ff878c VD |
1888 | struct fc_exch_mgr_anchor *ema, *next; |
1889 | ||
1890 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) | |
1891 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
1892 | } |
1893 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
1894 | ||
42e9a92f RL |
1895 | |
1896 | struct fc_seq *fc_exch_seq_send(struct fc_lport *lp, | |
1897 | struct fc_frame *fp, | |
1898 | void (*resp)(struct fc_seq *, | |
1899 | struct fc_frame *fp, | |
1900 | void *arg), | |
1901 | void (*destructor)(struct fc_seq *, void *), | |
1902 | void *arg, u32 timer_msec) | |
1903 | { | |
1904 | struct fc_exch *ep; | |
1905 | struct fc_seq *sp = NULL; | |
1906 | struct fc_frame_header *fh; | |
1907 | int rc = 1; | |
1908 | ||
52ff878c | 1909 | ep = fc_exch_alloc(lp, fp); |
42e9a92f RL |
1910 | if (!ep) { |
1911 | fc_frame_free(fp); | |
1912 | return NULL; | |
1913 | } | |
1914 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1915 | fh = fc_frame_header_get(fp); | |
1916 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
1917 | ep->resp = resp; | |
1918 | ep->destructor = destructor; | |
1919 | ep->arg = arg; | |
1920 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
1921 | ep->lp = lp; | |
1922 | sp = &ep->seq; | |
1923 | ||
1924 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
1925 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
1926 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
1927 | sp->cnt++; | |
1928 | ||
d7179680 VD |
1929 | if (ep->xid <= lp->lro_xid) |
1930 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); | |
b277d2aa | 1931 | |
42e9a92f RL |
1932 | if (unlikely(lp->tt.frame_send(lp, fp))) |
1933 | goto err; | |
1934 | ||
1935 | if (timer_msec) | |
1936 | fc_exch_timer_set_locked(ep, timer_msec); | |
1937 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
1938 | ||
1939 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
1940 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
1941 | spin_unlock_bh(&ep->ex_lock); | |
1942 | return sp; | |
1943 | err: | |
1944 | rc = fc_exch_done_locked(ep); | |
1945 | spin_unlock_bh(&ep->ex_lock); | |
1946 | if (!rc) | |
1947 | fc_exch_mgr_delete_ep(ep); | |
1948 | return NULL; | |
1949 | } | |
1950 | EXPORT_SYMBOL(fc_exch_seq_send); | |
1951 | ||
1952 | /* | |
1953 | * Receive a frame | |
1954 | */ | |
52ff878c | 1955 | void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp) |
42e9a92f RL |
1956 | { |
1957 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c VD |
1958 | struct fc_exch_mgr_anchor *ema; |
1959 | u32 f_ctl, found = 0; | |
1960 | u16 oxid; | |
42e9a92f RL |
1961 | |
1962 | /* lport lock ? */ | |
52ff878c | 1963 | if (!lp || lp->state == LPORT_ST_DISABLED) { |
7414705e RL |
1964 | FC_LPORT_DBG(lp, "Receiving frames for an lport that " |
1965 | "has not been initialized correctly\n"); | |
42e9a92f RL |
1966 | fc_frame_free(fp); |
1967 | return; | |
1968 | } | |
1969 | ||
52ff878c VD |
1970 | f_ctl = ntoh24(fh->fh_f_ctl); |
1971 | oxid = ntohs(fh->fh_ox_id); | |
1972 | if (f_ctl & FC_FC_EX_CTX) { | |
1973 | list_for_each_entry(ema, &lp->ema_list, ema_list) { | |
1974 | if ((oxid >= ema->mp->min_xid) && | |
1975 | (oxid <= ema->mp->max_xid)) { | |
1976 | found = 1; | |
1977 | break; | |
1978 | } | |
1979 | } | |
1980 | ||
1981 | if (!found) { | |
1982 | FC_LPORT_DBG(lp, "Received response for out " | |
1983 | "of range oxid:%hx\n", oxid); | |
1984 | fc_frame_free(fp); | |
1985 | return; | |
1986 | } | |
1987 | } else | |
1988 | ema = list_entry(lp->ema_list.prev, typeof(*ema), ema_list); | |
1989 | ||
42e9a92f RL |
1990 | /* |
1991 | * If frame is marked invalid, just drop it. | |
1992 | */ | |
42e9a92f RL |
1993 | switch (fr_eof(fp)) { |
1994 | case FC_EOF_T: | |
1995 | if (f_ctl & FC_FC_END_SEQ) | |
1996 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
1997 | /* fall through */ | |
1998 | case FC_EOF_N: | |
1999 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2000 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2001 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2002 | FC_FC_EX_CTX) | |
52ff878c | 2003 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2004 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2005 | fc_exch_recv_resp(ema->mp, fp); |
42e9a92f | 2006 | else |
52ff878c | 2007 | fc_exch_recv_req(lp, ema->mp, fp); |
42e9a92f RL |
2008 | break; |
2009 | default: | |
d459b7ea | 2010 | FC_LPORT_DBG(lp, "dropping invalid frame (eof %x)", fr_eof(fp)); |
42e9a92f | 2011 | fc_frame_free(fp); |
42e9a92f RL |
2012 | } |
2013 | } | |
2014 | EXPORT_SYMBOL(fc_exch_recv); | |
2015 | ||
2016 | int fc_exch_init(struct fc_lport *lp) | |
2017 | { | |
42e9a92f RL |
2018 | if (!lp->tt.seq_start_next) |
2019 | lp->tt.seq_start_next = fc_seq_start_next; | |
2020 | ||
2021 | if (!lp->tt.exch_seq_send) | |
2022 | lp->tt.exch_seq_send = fc_exch_seq_send; | |
2023 | ||
2024 | if (!lp->tt.seq_send) | |
2025 | lp->tt.seq_send = fc_seq_send; | |
2026 | ||
2027 | if (!lp->tt.seq_els_rsp_send) | |
2028 | lp->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
2029 | ||
2030 | if (!lp->tt.exch_done) | |
2031 | lp->tt.exch_done = fc_exch_done; | |
2032 | ||
2033 | if (!lp->tt.exch_mgr_reset) | |
2034 | lp->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
2035 | ||
2036 | if (!lp->tt.seq_exch_abort) | |
2037 | lp->tt.seq_exch_abort = fc_seq_exch_abort; | |
2038 | ||
e4bc50be VD |
2039 | /* |
2040 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2041 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2042 | * to order of 2's * power and order is stored | |
2043 | * in fc_cpu_order as this is later required in | |
2044 | * mapping between an exch id and exch array index | |
2045 | * in per cpu exch pool. | |
2046 | * | |
2047 | * This round up is required to align fc_cpu_mask | |
2048 | * to exchange id's lower bits such that all incoming | |
2049 | * frames of an exchange gets delivered to the same | |
2050 | * cpu on which exchange originated by simple bitwise | |
2051 | * AND operation between fc_cpu_mask and exchange id. | |
2052 | */ | |
2053 | fc_cpu_mask = 1; | |
2054 | fc_cpu_order = 0; | |
2055 | while (fc_cpu_mask < nr_cpu_ids) { | |
2056 | fc_cpu_mask <<= 1; | |
2057 | fc_cpu_order++; | |
2058 | } | |
2059 | fc_cpu_mask--; | |
2060 | ||
42e9a92f RL |
2061 | return 0; |
2062 | } | |
2063 | EXPORT_SYMBOL(fc_exch_init); | |
2064 | ||
2065 | int fc_setup_exch_mgr(void) | |
2066 | { | |
2067 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2068 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2069 | if (!fc_em_cachep) | |
2070 | return -ENOMEM; | |
2071 | return 0; | |
2072 | } | |
2073 | ||
2074 | void fc_destroy_exch_mgr(void) | |
2075 | { | |
2076 | kmem_cache_destroy(fc_em_cachep); | |
2077 | } |