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42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | |
3 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. | |
4 | * Copyright(c) 2008 Mike Christie | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | * | |
19 | * Maintained at www.Open-FCoE.org | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Fibre Channel exchange and sequence handling. | |
24 | */ | |
25 | ||
26 | #include <linux/timer.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
42e9a92f | 28 | #include <linux/err.h> |
09703660 | 29 | #include <linux/export.h> |
42e9a92f RL |
30 | |
31 | #include <scsi/fc/fc_fc2.h> | |
32 | ||
33 | #include <scsi/libfc.h> | |
34 | #include <scsi/fc_encode.h> | |
35 | ||
8866a5d9 RL |
36 | #include "fc_libfc.h" |
37 | ||
e4bc50be VD |
38 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
39 | EXPORT_SYMBOL(fc_cpu_mask); | |
40 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ | |
3a3b42bf | 41 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
55204909 | 42 | static struct workqueue_struct *fc_exch_workqueue; |
42e9a92f RL |
43 | |
44 | /* | |
45 | * Structure and function definitions for managing Fibre Channel Exchanges | |
46 | * and Sequences. | |
47 | * | |
48 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
49 | * | |
50 | * fc_exch_mgr holds the exchange state for an N port | |
51 | * | |
52 | * fc_exch holds state for one exchange and links to its active sequence. | |
53 | * | |
54 | * fc_seq holds the state for an individual sequence. | |
55 | */ | |
56 | ||
3a3b42bf RL |
57 | /** |
58 | * struct fc_exch_pool - Per cpu exchange pool | |
59 | * @next_index: Next possible free exchange index | |
60 | * @total_exches: Total allocated exchanges | |
61 | * @lock: Exch pool lock | |
62 | * @ex_list: List of exchanges | |
e4bc50be VD |
63 | * |
64 | * This structure manages per cpu exchanges in array of exchange pointers. | |
65 | * This array is allocated followed by struct fc_exch_pool memory for | |
66 | * assigned range of exchanges to per cpu pool. | |
67 | */ | |
68 | struct fc_exch_pool { | |
e17b4af7 VD |
69 | spinlock_t lock; |
70 | struct list_head ex_list; | |
3a3b42bf RL |
71 | u16 next_index; |
72 | u16 total_exches; | |
2034c19c HD |
73 | |
74 | /* two cache of free slot in exch array */ | |
75 | u16 left; | |
76 | u16 right; | |
e17b4af7 | 77 | } ____cacheline_aligned_in_smp; |
e4bc50be | 78 | |
3a3b42bf RL |
79 | /** |
80 | * struct fc_exch_mgr - The Exchange Manager (EM). | |
81 | * @class: Default class for new sequences | |
82 | * @kref: Reference counter | |
83 | * @min_xid: Minimum exchange ID | |
84 | * @max_xid: Maximum exchange ID | |
85 | * @ep_pool: Reserved exchange pointers | |
86 | * @pool_max_index: Max exch array index in exch pool | |
87 | * @pool: Per cpu exch pool | |
88 | * @stats: Statistics structure | |
42e9a92f RL |
89 | * |
90 | * This structure is the center for creating exchanges and sequences. | |
91 | * It manages the allocation of exchange IDs. | |
92 | */ | |
93 | struct fc_exch_mgr { | |
c6b21c93 | 94 | struct fc_exch_pool __percpu *pool; |
e17b4af7 | 95 | mempool_t *ep_pool; |
3a3b42bf RL |
96 | enum fc_class class; |
97 | struct kref kref; | |
98 | u16 min_xid; | |
99 | u16 max_xid; | |
3a3b42bf | 100 | u16 pool_max_index; |
42e9a92f | 101 | |
42e9a92f RL |
102 | struct { |
103 | atomic_t no_free_exch; | |
104 | atomic_t no_free_exch_xid; | |
105 | atomic_t xid_not_found; | |
106 | atomic_t xid_busy; | |
107 | atomic_t seq_not_found; | |
108 | atomic_t non_bls_resp; | |
109 | } stats; | |
42e9a92f | 110 | }; |
42e9a92f | 111 | |
3a3b42bf RL |
112 | /** |
113 | * struct fc_exch_mgr_anchor - primary structure for list of EMs | |
114 | * @ema_list: Exchange Manager Anchor list | |
115 | * @mp: Exchange Manager associated with this anchor | |
116 | * @match: Routine to determine if this anchor's EM should be used | |
117 | * | |
118 | * When walking the list of anchors the match routine will be called | |
119 | * for each anchor to determine if that EM should be used. The last | |
120 | * anchor in the list will always match to handle any exchanges not | |
121 | * handled by other EMs. The non-default EMs would be added to the | |
1bd49b48 | 122 | * anchor list by HW that provides offloads. |
3a3b42bf | 123 | */ |
96316099 VD |
124 | struct fc_exch_mgr_anchor { |
125 | struct list_head ema_list; | |
126 | struct fc_exch_mgr *mp; | |
127 | bool (*match)(struct fc_frame *); | |
128 | }; | |
129 | ||
42e9a92f | 130 | static void fc_exch_rrq(struct fc_exch *); |
92261156 JE |
131 | static void fc_seq_ls_acc(struct fc_frame *); |
132 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, | |
42e9a92f | 133 | enum fc_els_rjt_explan); |
92261156 JE |
134 | static void fc_exch_els_rec(struct fc_frame *); |
135 | static void fc_exch_els_rrq(struct fc_frame *); | |
42e9a92f RL |
136 | |
137 | /* | |
138 | * Internal implementation notes. | |
139 | * | |
140 | * The exchange manager is one by default in libfc but LLD may choose | |
141 | * to have one per CPU. The sequence manager is one per exchange manager | |
142 | * and currently never separated. | |
143 | * | |
144 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
145 | * assigned by the Sequence Initiator that shall be unique for a specific | |
146 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
147 | * qualified by exchange ID, which one might think it would be. | |
148 | * In practice this limits the number of open sequences and exchanges to 256 | |
149 | * per session. For most targets we could treat this limit as per exchange. | |
150 | * | |
151 | * The exchange and its sequence are freed when the last sequence is received. | |
152 | * It's possible for the remote port to leave an exchange open without | |
153 | * sending any sequences. | |
154 | * | |
155 | * Notes on reference counts: | |
156 | * | |
157 | * Exchanges are reference counted and exchange gets freed when the reference | |
158 | * count becomes zero. | |
159 | * | |
160 | * Timeouts: | |
161 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
162 | * | |
163 | * Sequence event handling: | |
164 | * | |
165 | * The following events may occur on initiator sequences: | |
166 | * | |
167 | * Send. | |
168 | * For now, the whole thing is sent. | |
169 | * Receive ACK | |
170 | * This applies only to class F. | |
171 | * The sequence is marked complete. | |
172 | * ULP completion. | |
173 | * The upper layer calls fc_exch_done() when done | |
174 | * with exchange and sequence tuple. | |
175 | * RX-inferred completion. | |
176 | * When we receive the next sequence on the same exchange, we can | |
177 | * retire the previous sequence ID. (XXX not implemented). | |
178 | * Timeout. | |
179 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
180 | * E_D_TOV causes abort and calls upper layer response handler | |
181 | * with FC_EX_TIMEOUT error. | |
182 | * Receive RJT | |
183 | * XXX defer. | |
184 | * Send ABTS | |
185 | * On timeout. | |
186 | * | |
187 | * The following events may occur on recipient sequences: | |
188 | * | |
189 | * Receive | |
190 | * Allocate sequence for first frame received. | |
191 | * Hold during receive handler. | |
192 | * Release when final frame received. | |
193 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
194 | * Receive ABTS | |
195 | * Deallocate sequence | |
196 | * Send RJT | |
197 | * Deallocate | |
198 | * | |
199 | * For now, we neglect conditions where only part of a sequence was | |
200 | * received or transmitted, or where out-of-order receipt is detected. | |
201 | */ | |
202 | ||
203 | /* | |
204 | * Locking notes: | |
205 | * | |
206 | * The EM code run in a per-CPU worker thread. | |
207 | * | |
208 | * To protect against concurrency between a worker thread code and timers, | |
209 | * sequence allocation and deallocation must be locked. | |
210 | * - exchange refcnt can be done atomicly without locks. | |
211 | * - sequence allocation must be locked by exch lock. | |
b2f0091f VD |
212 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
213 | * EM pool lock must be taken before the ex_lock. | |
42e9a92f RL |
214 | */ |
215 | ||
216 | /* | |
217 | * opcode names for debugging. | |
218 | */ | |
219 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
220 | ||
3a3b42bf RL |
221 | /** |
222 | * fc_exch_name_lookup() - Lookup name by opcode | |
223 | * @op: Opcode to be looked up | |
224 | * @table: Opcode/name table | |
225 | * @max_index: Index not to be exceeded | |
226 | * | |
227 | * This routine is used to determine a human-readable string identifying | |
228 | * a R_CTL opcode. | |
229 | */ | |
42e9a92f RL |
230 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
231 | unsigned int max_index) | |
232 | { | |
233 | const char *name = NULL; | |
234 | ||
235 | if (op < max_index) | |
236 | name = table[op]; | |
237 | if (!name) | |
238 | name = "unknown"; | |
239 | return name; | |
240 | } | |
241 | ||
3a3b42bf RL |
242 | /** |
243 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() | |
244 | * @op: The opcode to be looked up | |
245 | */ | |
42e9a92f RL |
246 | static const char *fc_exch_rctl_name(unsigned int op) |
247 | { | |
248 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
7156fffa | 249 | ARRAY_SIZE(fc_exch_rctl_names)); |
42e9a92f RL |
250 | } |
251 | ||
3a3b42bf RL |
252 | /** |
253 | * fc_exch_hold() - Increment an exchange's reference count | |
254 | * @ep: Echange to be held | |
42e9a92f | 255 | */ |
3a3b42bf | 256 | static inline void fc_exch_hold(struct fc_exch *ep) |
42e9a92f RL |
257 | { |
258 | atomic_inc(&ep->ex_refcnt); | |
259 | } | |
260 | ||
3a3b42bf RL |
261 | /** |
262 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields | |
263 | * and determine SOF and EOF. | |
264 | * @ep: The exchange to that will use the header | |
265 | * @fp: The frame whose header is to be modified | |
266 | * @f_ctl: F_CTL bits that will be used for the frame header | |
267 | * | |
268 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, | |
269 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. | |
42e9a92f RL |
270 | */ |
271 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
272 | u32 f_ctl) | |
273 | { | |
274 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
275 | u16 fill; | |
276 | ||
277 | fr_sof(fp) = ep->class; | |
278 | if (ep->seq.cnt) | |
279 | fr_sof(fp) = fc_sof_normal(ep->class); | |
280 | ||
281 | if (f_ctl & FC_FC_END_SEQ) { | |
282 | fr_eof(fp) = FC_EOF_T; | |
283 | if (fc_sof_needs_ack(ep->class)) | |
284 | fr_eof(fp) = FC_EOF_N; | |
285 | /* | |
3a3b42bf | 286 | * From F_CTL. |
42e9a92f RL |
287 | * The number of fill bytes to make the length a 4-byte |
288 | * multiple is the low order 2-bits of the f_ctl. | |
289 | * The fill itself will have been cleared by the frame | |
290 | * allocation. | |
291 | * After this, the length will be even, as expected by | |
292 | * the transport. | |
293 | */ | |
294 | fill = fr_len(fp) & 3; | |
295 | if (fill) { | |
296 | fill = 4 - fill; | |
297 | /* TODO, this may be a problem with fragmented skb */ | |
298 | skb_put(fp_skb(fp), fill); | |
299 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
300 | } | |
301 | } else { | |
302 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
303 | fr_eof(fp) = FC_EOF_N; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Initialize remainig fh fields | |
308 | * from fc_fill_fc_hdr | |
309 | */ | |
310 | fh->fh_ox_id = htons(ep->oxid); | |
311 | fh->fh_rx_id = htons(ep->rxid); | |
312 | fh->fh_seq_id = ep->seq.id; | |
313 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
314 | } | |
315 | ||
3a3b42bf RL |
316 | /** |
317 | * fc_exch_release() - Decrement an exchange's reference count | |
318 | * @ep: Exchange to be released | |
319 | * | |
320 | * If the reference count reaches zero and the exchange is complete, | |
321 | * it is freed. | |
42e9a92f RL |
322 | */ |
323 | static void fc_exch_release(struct fc_exch *ep) | |
324 | { | |
325 | struct fc_exch_mgr *mp; | |
326 | ||
327 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
328 | mp = ep->em; | |
329 | if (ep->destructor) | |
330 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 331 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
332 | mempool_free(ep, mp->ep_pool); |
333 | } | |
334 | } | |
335 | ||
b29a4f30 VD |
336 | /** |
337 | * fc_exch_timer_cancel() - cancel exch timer | |
338 | * @ep: The exchange whose timer to be canceled | |
339 | */ | |
4a80f083 | 340 | static inline void fc_exch_timer_cancel(struct fc_exch *ep) |
b29a4f30 VD |
341 | { |
342 | if (cancel_delayed_work(&ep->timeout_work)) { | |
343 | FC_EXCH_DBG(ep, "Exchange timer canceled\n"); | |
344 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
345 | } | |
346 | } | |
347 | ||
348 | /** | |
349 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the | |
350 | * the exchange lock held | |
351 | * @ep: The exchange whose timer will start | |
352 | * @timer_msec: The timeout period | |
353 | * | |
354 | * Used for upper level protocols to time out the exchange. | |
355 | * The timer is cancelled when it fires or when the exchange completes. | |
356 | */ | |
357 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
358 | unsigned int timer_msec) | |
359 | { | |
360 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
361 | return; | |
362 | ||
363 | FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec); | |
364 | ||
365 | if (queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, | |
366 | msecs_to_jiffies(timer_msec))) | |
367 | fc_exch_hold(ep); /* hold for timer */ | |
368 | } | |
369 | ||
370 | /** | |
371 | * fc_exch_timer_set() - Lock the exchange and set the timer | |
372 | * @ep: The exchange whose timer will start | |
373 | * @timer_msec: The timeout period | |
374 | */ | |
375 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
376 | { | |
377 | spin_lock_bh(&ep->ex_lock); | |
378 | fc_exch_timer_set_locked(ep, timer_msec); | |
379 | spin_unlock_bh(&ep->ex_lock); | |
380 | } | |
381 | ||
3a3b42bf RL |
382 | /** |
383 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held | |
384 | * @ep: The exchange that is complete | |
385 | */ | |
42e9a92f RL |
386 | static int fc_exch_done_locked(struct fc_exch *ep) |
387 | { | |
388 | int rc = 1; | |
389 | ||
390 | /* | |
391 | * We must check for completion in case there are two threads | |
392 | * tyring to complete this. But the rrq code will reuse the | |
393 | * ep, and in that case we only clear the resp and set it as | |
394 | * complete, so it can be reused by the timer to send the rrq. | |
395 | */ | |
396 | ep->resp = NULL; | |
397 | if (ep->state & FC_EX_DONE) | |
398 | return rc; | |
399 | ep->esb_stat |= ESB_ST_COMPLETE; | |
400 | ||
401 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
402 | ep->state |= FC_EX_DONE; | |
b29a4f30 | 403 | fc_exch_timer_cancel(ep); |
42e9a92f RL |
404 | rc = 0; |
405 | } | |
406 | return rc; | |
407 | } | |
408 | ||
3a3b42bf RL |
409 | /** |
410 | * fc_exch_ptr_get() - Return an exchange from an exchange pool | |
411 | * @pool: Exchange Pool to get an exchange from | |
412 | * @index: Index of the exchange within the pool | |
413 | * | |
414 | * Use the index to get an exchange from within an exchange pool. exches | |
415 | * will point to an array of exchange pointers. The index will select | |
416 | * the exchange within the array. | |
417 | */ | |
e4bc50be VD |
418 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
419 | u16 index) | |
420 | { | |
421 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); | |
422 | return exches[index]; | |
423 | } | |
424 | ||
3a3b42bf RL |
425 | /** |
426 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool | |
427 | * @pool: The pool to assign the exchange to | |
428 | * @index: The index in the pool where the exchange will be assigned | |
429 | * @ep: The exchange to assign to the pool | |
430 | */ | |
e4bc50be VD |
431 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, |
432 | struct fc_exch *ep) | |
433 | { | |
434 | ((struct fc_exch **)(pool + 1))[index] = ep; | |
435 | } | |
436 | ||
3a3b42bf RL |
437 | /** |
438 | * fc_exch_delete() - Delete an exchange | |
439 | * @ep: The exchange to be deleted | |
440 | */ | |
b2f0091f | 441 | static void fc_exch_delete(struct fc_exch *ep) |
42e9a92f | 442 | { |
b2f0091f | 443 | struct fc_exch_pool *pool; |
2034c19c | 444 | u16 index; |
42e9a92f | 445 | |
b2f0091f VD |
446 | pool = ep->pool; |
447 | spin_lock_bh(&pool->lock); | |
448 | WARN_ON(pool->total_exches <= 0); | |
449 | pool->total_exches--; | |
2034c19c HD |
450 | |
451 | /* update cache of free slot */ | |
452 | index = (ep->xid - ep->em->min_xid) >> fc_cpu_order; | |
453 | if (pool->left == FC_XID_UNKNOWN) | |
454 | pool->left = index; | |
455 | else if (pool->right == FC_XID_UNKNOWN) | |
456 | pool->right = index; | |
457 | else | |
458 | pool->next_index = index; | |
459 | ||
460 | fc_exch_ptr_set(pool, index, NULL); | |
42e9a92f | 461 | list_del(&ep->ex_list); |
b2f0091f | 462 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
463 | fc_exch_release(ep); /* drop hold for exch in mp */ |
464 | } | |
465 | ||
fb00cc23 | 466 | static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp, |
1a7b75ae RL |
467 | struct fc_frame *fp) |
468 | { | |
469 | struct fc_exch *ep; | |
470 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
471 | int error; | |
3a3b42bf | 472 | u32 f_ctl; |
14fc315f | 473 | u8 fh_type = fh->fh_type; |
1a7b75ae RL |
474 | |
475 | ep = fc_seq_exch(sp); | |
fb00cc23 | 476 | WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT)); |
1a7b75ae RL |
477 | |
478 | f_ctl = ntoh24(fh->fh_f_ctl); | |
479 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
f60e12e9 | 480 | fr_encaps(fp) = ep->encaps; |
1a7b75ae RL |
481 | |
482 | /* | |
483 | * update sequence count if this frame is carrying | |
484 | * multiple FC frames when sequence offload is enabled | |
485 | * by LLD. | |
486 | */ | |
487 | if (fr_max_payload(fp)) | |
488 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
489 | fr_max_payload(fp)); | |
490 | else | |
491 | sp->cnt++; | |
492 | ||
493 | /* | |
494 | * Send the frame. | |
495 | */ | |
3a3b42bf | 496 | error = lport->tt.frame_send(lport, fp); |
1a7b75ae | 497 | |
14fc315f | 498 | if (fh_type == FC_TYPE_BLS) |
fb00cc23 | 499 | goto out; |
77a2b73a | 500 | |
1a7b75ae RL |
501 | /* |
502 | * Update the exchange and sequence flags, | |
503 | * assuming all frames for the sequence have been sent. | |
504 | * We can only be called to send once for each sequence. | |
505 | */ | |
1a7b75ae | 506 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ |
cc3593d3 | 507 | if (f_ctl & FC_FC_SEQ_INIT) |
1a7b75ae | 508 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
fb00cc23 NH |
509 | out: |
510 | return error; | |
511 | } | |
512 | ||
513 | /** | |
514 | * fc_seq_send() - Send a frame using existing sequence/exchange pair | |
515 | * @lport: The local port that the exchange will be sent on | |
516 | * @sp: The sequence to be sent | |
517 | * @fp: The frame to be sent on the exchange | |
518 | */ | |
519 | static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, | |
520 | struct fc_frame *fp) | |
521 | { | |
522 | struct fc_exch *ep; | |
523 | int error; | |
524 | ep = fc_seq_exch(sp); | |
525 | spin_lock_bh(&ep->ex_lock); | |
526 | error = fc_seq_send_locked(lport, sp, fp); | |
1a7b75ae RL |
527 | spin_unlock_bh(&ep->ex_lock); |
528 | return error; | |
529 | } | |
530 | ||
531 | /** | |
3a3b42bf RL |
532 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
533 | * @ep: The exchange to allocate a new sequence for | |
534 | * @seq_id: The sequence ID to be used | |
1a7b75ae RL |
535 | * |
536 | * We don't support multiple originated sequences on the same exchange. | |
537 | * By implication, any previously originated sequence on this exchange | |
538 | * is complete, and we reallocate the same sequence. | |
539 | */ | |
540 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
541 | { | |
542 | struct fc_seq *sp; | |
543 | ||
544 | sp = &ep->seq; | |
545 | sp->ssb_stat = 0; | |
546 | sp->cnt = 0; | |
547 | sp->id = seq_id; | |
548 | return sp; | |
549 | } | |
550 | ||
3a3b42bf RL |
551 | /** |
552 | * fc_seq_start_next_locked() - Allocate a new sequence on the same | |
553 | * exchange as the supplied sequence | |
554 | * @sp: The sequence/exchange to get a new sequence for | |
555 | */ | |
1a7b75ae RL |
556 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
557 | { | |
558 | struct fc_exch *ep = fc_seq_exch(sp); | |
559 | ||
560 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
561 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", | |
562 | ep->f_ctl, sp->id); | |
563 | return sp; | |
564 | } | |
565 | ||
566 | /** | |
3a3b42bf RL |
567 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
568 | * for a given sequence/exchange pair | |
569 | * @sp: The sequence/exchange to get a new exchange for | |
1a7b75ae RL |
570 | */ |
571 | static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
572 | { | |
573 | struct fc_exch *ep = fc_seq_exch(sp); | |
574 | ||
575 | spin_lock_bh(&ep->ex_lock); | |
576 | sp = fc_seq_start_next_locked(sp); | |
577 | spin_unlock_bh(&ep->ex_lock); | |
578 | ||
579 | return sp; | |
580 | } | |
581 | ||
1a5c2d7e JE |
582 | /* |
583 | * Set the response handler for the exchange associated with a sequence. | |
584 | */ | |
585 | static void fc_seq_set_resp(struct fc_seq *sp, | |
586 | void (*resp)(struct fc_seq *, struct fc_frame *, | |
587 | void *), | |
588 | void *arg) | |
589 | { | |
590 | struct fc_exch *ep = fc_seq_exch(sp); | |
591 | ||
592 | spin_lock_bh(&ep->ex_lock); | |
593 | ep->resp = resp; | |
594 | ep->arg = arg; | |
595 | spin_unlock_bh(&ep->ex_lock); | |
596 | } | |
597 | ||
1a7b75ae | 598 | /** |
77a2b73a VD |
599 | * fc_exch_abort_locked() - Abort an exchange |
600 | * @ep: The exchange to be aborted | |
3a3b42bf RL |
601 | * @timer_msec: The period of time to wait before aborting |
602 | * | |
77a2b73a VD |
603 | * Locking notes: Called with exch lock held |
604 | * | |
605 | * Return value: 0 on success else error code | |
1a7b75ae | 606 | */ |
77a2b73a VD |
607 | static int fc_exch_abort_locked(struct fc_exch *ep, |
608 | unsigned int timer_msec) | |
42e9a92f RL |
609 | { |
610 | struct fc_seq *sp; | |
42e9a92f RL |
611 | struct fc_frame *fp; |
612 | int error; | |
613 | ||
42e9a92f | 614 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || |
77a2b73a | 615 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) |
42e9a92f | 616 | return -ENXIO; |
42e9a92f RL |
617 | |
618 | /* | |
619 | * Send the abort on a new sequence if possible. | |
620 | */ | |
621 | sp = fc_seq_start_next_locked(&ep->seq); | |
77a2b73a | 622 | if (!sp) |
42e9a92f | 623 | return -ENOMEM; |
42e9a92f RL |
624 | |
625 | ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL; | |
626 | if (timer_msec) | |
627 | fc_exch_timer_set_locked(ep, timer_msec); | |
42e9a92f RL |
628 | |
629 | /* | |
630 | * If not logged into the fabric, don't send ABTS but leave | |
631 | * sequence active until next timeout. | |
632 | */ | |
633 | if (!ep->sid) | |
634 | return 0; | |
635 | ||
636 | /* | |
637 | * Send an abort for the sequence that timed out. | |
638 | */ | |
639 | fp = fc_frame_alloc(ep->lp, 0); | |
640 | if (fp) { | |
641 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
642 | FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
fb00cc23 | 643 | error = fc_seq_send_locked(ep->lp, sp, fp); |
42e9a92f RL |
644 | } else |
645 | error = -ENOBUFS; | |
646 | return error; | |
647 | } | |
42e9a92f | 648 | |
77a2b73a VD |
649 | /** |
650 | * fc_seq_exch_abort() - Abort an exchange and sequence | |
651 | * @req_sp: The sequence to be aborted | |
652 | * @timer_msec: The period of time to wait before aborting | |
653 | * | |
654 | * Generally called because of a timeout or an abort from the upper layer. | |
655 | * | |
656 | * Return value: 0 on success else error code | |
657 | */ | |
658 | static int fc_seq_exch_abort(const struct fc_seq *req_sp, | |
659 | unsigned int timer_msec) | |
660 | { | |
661 | struct fc_exch *ep; | |
662 | int error; | |
663 | ||
664 | ep = fc_seq_exch(req_sp); | |
665 | spin_lock_bh(&ep->ex_lock); | |
666 | error = fc_exch_abort_locked(ep, timer_msec); | |
667 | spin_unlock_bh(&ep->ex_lock); | |
668 | return error; | |
669 | } | |
670 | ||
3a3b42bf RL |
671 | /** |
672 | * fc_exch_timeout() - Handle exchange timer expiration | |
673 | * @work: The work_struct identifying the exchange that timed out | |
42e9a92f RL |
674 | */ |
675 | static void fc_exch_timeout(struct work_struct *work) | |
676 | { | |
677 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
678 | timeout_work.work); | |
679 | struct fc_seq *sp = &ep->seq; | |
680 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
681 | void *arg; | |
682 | u32 e_stat; | |
683 | int rc = 1; | |
684 | ||
cd305ce4 RL |
685 | FC_EXCH_DBG(ep, "Exchange timed out\n"); |
686 | ||
42e9a92f RL |
687 | spin_lock_bh(&ep->ex_lock); |
688 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
689 | goto unlock; | |
690 | ||
691 | e_stat = ep->esb_stat; | |
692 | if (e_stat & ESB_ST_COMPLETE) { | |
693 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 694 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
695 | if (e_stat & ESB_ST_REC_QUAL) |
696 | fc_exch_rrq(ep); | |
42e9a92f RL |
697 | goto done; |
698 | } else { | |
699 | resp = ep->resp; | |
700 | arg = ep->arg; | |
701 | ep->resp = NULL; | |
702 | if (e_stat & ESB_ST_ABNORMAL) | |
703 | rc = fc_exch_done_locked(ep); | |
704 | spin_unlock_bh(&ep->ex_lock); | |
f3162483 PN |
705 | if (!rc) |
706 | fc_exch_delete(ep); | |
42e9a92f RL |
707 | if (resp) |
708 | resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg); | |
709 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); | |
710 | goto done; | |
711 | } | |
712 | unlock: | |
713 | spin_unlock_bh(&ep->ex_lock); | |
714 | done: | |
715 | /* | |
716 | * This release matches the hold taken when the timer was set. | |
717 | */ | |
718 | fc_exch_release(ep); | |
719 | } | |
720 | ||
52ff878c | 721 | /** |
3a3b42bf RL |
722 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
723 | * @lport: The local port that the exchange is for | |
724 | * @mp: The exchange manager that will allocate the exchange | |
42e9a92f | 725 | * |
d7179680 | 726 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 727 | */ |
52ff878c | 728 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 729 | struct fc_exch_mgr *mp) |
42e9a92f RL |
730 | { |
731 | struct fc_exch *ep; | |
b2f0091f VD |
732 | unsigned int cpu; |
733 | u16 index; | |
734 | struct fc_exch_pool *pool; | |
42e9a92f RL |
735 | |
736 | /* allocate memory for exchange */ | |
737 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
738 | if (!ep) { | |
739 | atomic_inc(&mp->stats.no_free_exch); | |
740 | goto out; | |
741 | } | |
742 | memset(ep, 0, sizeof(*ep)); | |
743 | ||
f018b73a | 744 | cpu = get_cpu(); |
b2f0091f VD |
745 | pool = per_cpu_ptr(mp->pool, cpu); |
746 | spin_lock_bh(&pool->lock); | |
f018b73a | 747 | put_cpu(); |
2034c19c HD |
748 | |
749 | /* peek cache of free slot */ | |
750 | if (pool->left != FC_XID_UNKNOWN) { | |
751 | index = pool->left; | |
752 | pool->left = FC_XID_UNKNOWN; | |
753 | goto hit; | |
754 | } | |
755 | if (pool->right != FC_XID_UNKNOWN) { | |
756 | index = pool->right; | |
757 | pool->right = FC_XID_UNKNOWN; | |
758 | goto hit; | |
759 | } | |
760 | ||
b2f0091f VD |
761 | index = pool->next_index; |
762 | /* allocate new exch from pool */ | |
763 | while (fc_exch_ptr_get(pool, index)) { | |
764 | index = index == mp->pool_max_index ? 0 : index + 1; | |
765 | if (index == pool->next_index) | |
42e9a92f | 766 | goto err; |
42e9a92f | 767 | } |
b2f0091f | 768 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
2034c19c | 769 | hit: |
42e9a92f RL |
770 | fc_exch_hold(ep); /* hold for exch in mp */ |
771 | spin_lock_init(&ep->ex_lock); | |
772 | /* | |
773 | * Hold exch lock for caller to prevent fc_exch_reset() | |
774 | * from releasing exch while fc_exch_alloc() caller is | |
775 | * still working on exch. | |
776 | */ | |
777 | spin_lock_bh(&ep->ex_lock); | |
778 | ||
b2f0091f VD |
779 | fc_exch_ptr_set(pool, index, ep); |
780 | list_add_tail(&ep->ex_list, &pool->ex_list); | |
42e9a92f | 781 | fc_seq_alloc(ep, ep->seq_id++); |
b2f0091f VD |
782 | pool->total_exches++; |
783 | spin_unlock_bh(&pool->lock); | |
42e9a92f RL |
784 | |
785 | /* | |
786 | * update exchange | |
787 | */ | |
b2f0091f | 788 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
42e9a92f | 789 | ep->em = mp; |
b2f0091f | 790 | ep->pool = pool; |
52ff878c | 791 | ep->lp = lport; |
42e9a92f RL |
792 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
793 | ep->rxid = FC_XID_UNKNOWN; | |
794 | ep->class = mp->class; | |
795 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); | |
796 | out: | |
797 | return ep; | |
798 | err: | |
b2f0091f | 799 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
800 | atomic_inc(&mp->stats.no_free_exch_xid); |
801 | mempool_free(ep, mp->ep_pool); | |
802 | return NULL; | |
803 | } | |
52ff878c VD |
804 | |
805 | /** | |
3a3b42bf RL |
806 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
807 | * local port's list of EMs. | |
808 | * @lport: The local port that will own the exchange | |
809 | * @fp: The FC frame that the exchange will be for | |
52ff878c | 810 | * |
3a3b42bf RL |
811 | * This function walks the list of exchange manager(EM) |
812 | * anchors to select an EM for a new exchange allocation. The | |
813 | * EM is selected when a NULL match function pointer is encountered | |
814 | * or when a call to a match function returns true. | |
52ff878c | 815 | */ |
3e22760d VD |
816 | static inline struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
817 | struct fc_frame *fp) | |
52ff878c VD |
818 | { |
819 | struct fc_exch_mgr_anchor *ema; | |
52ff878c | 820 | |
3e22760d VD |
821 | list_for_each_entry(ema, &lport->ema_list, ema_list) |
822 | if (!ema->match || ema->match(fp)) | |
823 | return fc_exch_em_alloc(lport, ema->mp); | |
52ff878c VD |
824 | return NULL; |
825 | } | |
42e9a92f | 826 | |
3a3b42bf RL |
827 | /** |
828 | * fc_exch_find() - Lookup and hold an exchange | |
829 | * @mp: The exchange manager to lookup the exchange from | |
830 | * @xid: The XID of the exchange to look up | |
42e9a92f RL |
831 | */ |
832 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
833 | { | |
b2f0091f | 834 | struct fc_exch_pool *pool; |
42e9a92f RL |
835 | struct fc_exch *ep = NULL; |
836 | ||
837 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
b2f0091f VD |
838 | pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask); |
839 | spin_lock_bh(&pool->lock); | |
840 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); | |
324f6678 | 841 | if (ep && ep->xid == xid) |
42e9a92f | 842 | fc_exch_hold(ep); |
b2f0091f | 843 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
844 | } |
845 | return ep; | |
846 | } | |
847 | ||
1a7b75ae RL |
848 | |
849 | /** | |
850 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and | |
3a3b42bf RL |
851 | * the memory allocated for the related objects may be freed. |
852 | * @sp: The sequence that has completed | |
1a7b75ae RL |
853 | */ |
854 | static void fc_exch_done(struct fc_seq *sp) | |
42e9a92f RL |
855 | { |
856 | struct fc_exch *ep = fc_seq_exch(sp); | |
857 | int rc; | |
858 | ||
859 | spin_lock_bh(&ep->ex_lock); | |
860 | rc = fc_exch_done_locked(ep); | |
861 | spin_unlock_bh(&ep->ex_lock); | |
862 | if (!rc) | |
b2f0091f | 863 | fc_exch_delete(ep); |
42e9a92f | 864 | } |
42e9a92f | 865 | |
3a3b42bf RL |
866 | /** |
867 | * fc_exch_resp() - Allocate a new exchange for a response frame | |
868 | * @lport: The local port that the exchange was for | |
869 | * @mp: The exchange manager to allocate the exchange from | |
870 | * @fp: The response frame | |
871 | * | |
42e9a92f RL |
872 | * Sets the responder ID in the frame header. |
873 | */ | |
52ff878c VD |
874 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
875 | struct fc_exch_mgr *mp, | |
876 | struct fc_frame *fp) | |
42e9a92f RL |
877 | { |
878 | struct fc_exch *ep; | |
879 | struct fc_frame_header *fh; | |
42e9a92f | 880 | |
52ff878c | 881 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
882 | if (ep) { |
883 | ep->class = fc_frame_class(fp); | |
884 | ||
885 | /* | |
886 | * Set EX_CTX indicating we're responding on this exchange. | |
887 | */ | |
888 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
889 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
890 | fh = fc_frame_header_get(fp); | |
891 | ep->sid = ntoh24(fh->fh_d_id); | |
892 | ep->did = ntoh24(fh->fh_s_id); | |
893 | ep->oid = ep->did; | |
894 | ||
895 | /* | |
896 | * Allocated exchange has placed the XID in the | |
897 | * originator field. Move it to the responder field, | |
898 | * and set the originator XID from the frame. | |
899 | */ | |
900 | ep->rxid = ep->xid; | |
901 | ep->oxid = ntohs(fh->fh_ox_id); | |
902 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
903 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
904 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
905 | ||
42e9a92f | 906 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 907 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
908 | } |
909 | return ep; | |
910 | } | |
911 | ||
3a3b42bf RL |
912 | /** |
913 | * fc_seq_lookup_recip() - Find a sequence where the other end | |
914 | * originated the sequence | |
915 | * @lport: The local port that the frame was sent to | |
916 | * @mp: The Exchange Manager to lookup the exchange from | |
917 | * @fp: The frame associated with the sequence we're looking for | |
918 | * | |
42e9a92f RL |
919 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
920 | * on the ep that should be released by the caller. | |
921 | */ | |
52ff878c VD |
922 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
923 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 924 | struct fc_frame *fp) |
42e9a92f RL |
925 | { |
926 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
927 | struct fc_exch *ep = NULL; | |
928 | struct fc_seq *sp = NULL; | |
929 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
930 | u32 f_ctl; | |
931 | u16 xid; | |
932 | ||
933 | f_ctl = ntoh24(fh->fh_f_ctl); | |
934 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
935 | ||
936 | /* | |
937 | * Lookup or create the exchange if we will be creating the sequence. | |
938 | */ | |
939 | if (f_ctl & FC_FC_EX_CTX) { | |
940 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
941 | ep = fc_exch_find(mp, xid); | |
942 | if (!ep) { | |
943 | atomic_inc(&mp->stats.xid_not_found); | |
944 | reject = FC_RJT_OX_ID; | |
945 | goto out; | |
946 | } | |
947 | if (ep->rxid == FC_XID_UNKNOWN) | |
948 | ep->rxid = ntohs(fh->fh_rx_id); | |
949 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
950 | reject = FC_RJT_OX_ID; | |
951 | goto rel; | |
952 | } | |
953 | } else { | |
954 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
955 | ||
956 | /* | |
957 | * Special case for MDS issuing an ELS TEST with a | |
958 | * bad rxid of 0. | |
959 | * XXX take this out once we do the proper reject. | |
960 | */ | |
961 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
962 | fc_frame_payload_op(fp) == ELS_TEST) { | |
963 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
964 | xid = FC_XID_UNKNOWN; | |
965 | } | |
966 | ||
967 | /* | |
968 | * new sequence - find the exchange | |
969 | */ | |
970 | ep = fc_exch_find(mp, xid); | |
971 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
972 | if (ep) { | |
973 | atomic_inc(&mp->stats.xid_busy); | |
974 | reject = FC_RJT_RX_ID; | |
975 | goto rel; | |
976 | } | |
52ff878c | 977 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
978 | if (!ep) { |
979 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
980 | goto out; | |
981 | } | |
982 | xid = ep->xid; /* get our XID */ | |
983 | } else if (!ep) { | |
984 | atomic_inc(&mp->stats.xid_not_found); | |
985 | reject = FC_RJT_RX_ID; /* XID not found */ | |
986 | goto out; | |
987 | } | |
988 | } | |
989 | ||
990 | /* | |
991 | * At this point, we have the exchange held. | |
992 | * Find or create the sequence. | |
993 | */ | |
994 | if (fc_sof_is_init(fr_sof(fp))) { | |
a104c844 | 995 | sp = &ep->seq; |
42e9a92f | 996 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 | 997 | sp->id = fh->fh_seq_id; |
42e9a92f RL |
998 | } else { |
999 | sp = &ep->seq; | |
1000 | if (sp->id != fh->fh_seq_id) { | |
1001 | atomic_inc(&mp->stats.seq_not_found); | |
e3e65c69 KP |
1002 | if (f_ctl & FC_FC_END_SEQ) { |
1003 | /* | |
1004 | * Update sequence_id based on incoming last | |
1005 | * frame of sequence exchange. This is needed | |
1bd49b48 | 1006 | * for FC target where DDP has been used |
e3e65c69 KP |
1007 | * on target where, stack is indicated only |
1008 | * about last frame's (payload _header) header. | |
1009 | * Whereas "seq_id" which is part of | |
1010 | * frame_header is allocated by initiator | |
1011 | * which is totally different from "seq_id" | |
1012 | * allocated when XFER_RDY was sent by target. | |
1013 | * To avoid false -ve which results into not | |
1014 | * sending RSP, hence write request on other | |
1015 | * end never finishes. | |
1016 | */ | |
1017 | spin_lock_bh(&ep->ex_lock); | |
1018 | sp->ssb_stat |= SSB_ST_RESP; | |
1019 | sp->id = fh->fh_seq_id; | |
1020 | spin_unlock_bh(&ep->ex_lock); | |
1021 | } else { | |
1022 | /* sequence/exch should exist */ | |
1023 | reject = FC_RJT_SEQ_ID; | |
1024 | goto rel; | |
1025 | } | |
42e9a92f RL |
1026 | } |
1027 | } | |
1028 | WARN_ON(ep != fc_seq_exch(sp)); | |
1029 | ||
1030 | if (f_ctl & FC_FC_SEQ_INIT) | |
1031 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1032 | ||
1033 | fr_seq(fp) = sp; | |
1034 | out: | |
1035 | return reject; | |
1036 | rel: | |
1037 | fc_exch_done(&ep->seq); | |
1038 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
1039 | return reject; | |
1040 | } | |
1041 | ||
3a3b42bf RL |
1042 | /** |
1043 | * fc_seq_lookup_orig() - Find a sequence where this end | |
1044 | * originated the sequence | |
1045 | * @mp: The Exchange Manager to lookup the exchange from | |
1046 | * @fp: The frame associated with the sequence we're looking for | |
1047 | * | |
42e9a92f RL |
1048 | * Does not hold the sequence for the caller. |
1049 | */ | |
1050 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
1051 | struct fc_frame *fp) | |
1052 | { | |
1053 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1054 | struct fc_exch *ep; | |
1055 | struct fc_seq *sp = NULL; | |
1056 | u32 f_ctl; | |
1057 | u16 xid; | |
1058 | ||
1059 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1060 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
1061 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
1062 | ep = fc_exch_find(mp, xid); | |
1063 | if (!ep) | |
1064 | return NULL; | |
1065 | if (ep->seq.id == fh->fh_seq_id) { | |
1066 | /* | |
1067 | * Save the RX_ID if we didn't previously know it. | |
1068 | */ | |
1069 | sp = &ep->seq; | |
1070 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
1071 | ep->rxid == FC_XID_UNKNOWN) { | |
1072 | ep->rxid = ntohs(fh->fh_rx_id); | |
1073 | } | |
1074 | } | |
1075 | fc_exch_release(ep); | |
1076 | return sp; | |
1077 | } | |
1078 | ||
3a3b42bf RL |
1079 | /** |
1080 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange | |
1081 | * @ep: The exchange to set the addresses for | |
1082 | * @orig_id: The originator's ID | |
1083 | * @resp_id: The responder's ID | |
1084 | * | |
42e9a92f RL |
1085 | * Note this must be done before the first sequence of the exchange is sent. |
1086 | */ | |
1087 | static void fc_exch_set_addr(struct fc_exch *ep, | |
1088 | u32 orig_id, u32 resp_id) | |
1089 | { | |
1090 | ep->oid = orig_id; | |
1091 | if (ep->esb_stat & ESB_ST_RESP) { | |
1092 | ep->sid = resp_id; | |
1093 | ep->did = orig_id; | |
1094 | } else { | |
1095 | ep->sid = orig_id; | |
1096 | ep->did = resp_id; | |
1097 | } | |
1098 | } | |
1099 | ||
1a7b75ae | 1100 | /** |
25985edc | 1101 | * fc_seq_els_rsp_send() - Send an ELS response using information from |
3a3b42bf | 1102 | * the existing sequence/exchange. |
92261156 | 1103 | * @fp: The received frame |
3a3b42bf RL |
1104 | * @els_cmd: The ELS command to be sent |
1105 | * @els_data: The ELS data to be sent | |
92261156 JE |
1106 | * |
1107 | * The received frame is not freed. | |
42e9a92f | 1108 | */ |
92261156 | 1109 | static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, |
1a7b75ae | 1110 | struct fc_seq_els_data *els_data) |
42e9a92f RL |
1111 | { |
1112 | switch (els_cmd) { | |
1113 | case ELS_LS_RJT: | |
92261156 | 1114 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); |
42e9a92f RL |
1115 | break; |
1116 | case ELS_LS_ACC: | |
92261156 | 1117 | fc_seq_ls_acc(fp); |
42e9a92f RL |
1118 | break; |
1119 | case ELS_RRQ: | |
92261156 | 1120 | fc_exch_els_rrq(fp); |
42e9a92f RL |
1121 | break; |
1122 | case ELS_REC: | |
92261156 | 1123 | fc_exch_els_rec(fp); |
42e9a92f RL |
1124 | break; |
1125 | default: | |
92261156 | 1126 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
1127 | } |
1128 | } | |
42e9a92f | 1129 | |
3a3b42bf RL |
1130 | /** |
1131 | * fc_seq_send_last() - Send a sequence that is the last in the exchange | |
1132 | * @sp: The sequence that is to be sent | |
1133 | * @fp: The frame that will be sent on the sequence | |
1134 | * @rctl: The R_CTL information to be sent | |
1135 | * @fh_type: The frame header type | |
42e9a92f RL |
1136 | */ |
1137 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
1138 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
1139 | { | |
1140 | u32 f_ctl; | |
1141 | struct fc_exch *ep = fc_seq_exch(sp); | |
1142 | ||
1143 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1144 | f_ctl |= ep->f_ctl; | |
1145 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
fb00cc23 | 1146 | fc_seq_send_locked(ep->lp, sp, fp); |
42e9a92f RL |
1147 | } |
1148 | ||
3a3b42bf RL |
1149 | /** |
1150 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame | |
1151 | * @sp: The sequence to send the ACK on | |
1152 | * @rx_fp: The received frame that is being acknoledged | |
1153 | * | |
42e9a92f | 1154 | * Send ACK_1 (or equiv.) indicating we received something. |
42e9a92f RL |
1155 | */ |
1156 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
1157 | { | |
1158 | struct fc_frame *fp; | |
1159 | struct fc_frame_header *rx_fh; | |
1160 | struct fc_frame_header *fh; | |
1161 | struct fc_exch *ep = fc_seq_exch(sp); | |
3a3b42bf | 1162 | struct fc_lport *lport = ep->lp; |
42e9a92f RL |
1163 | unsigned int f_ctl; |
1164 | ||
1165 | /* | |
1166 | * Don't send ACKs for class 3. | |
1167 | */ | |
1168 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
3a3b42bf | 1169 | fp = fc_frame_alloc(lport, 0); |
42e9a92f RL |
1170 | if (!fp) |
1171 | return; | |
1172 | ||
1173 | fh = fc_frame_header_get(fp); | |
1174 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
1175 | fh->fh_type = FC_TYPE_BLS; | |
1176 | ||
1177 | /* | |
1178 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1179 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1180 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1181 | * Last ACK uses bits 7-6 (continue sequence), | |
1182 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1183 | */ | |
1184 | rx_fh = fc_frame_header_get(rx_fp); | |
1185 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1186 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1187 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
1188 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1189 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1190 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1191 | hton24(fh->fh_f_ctl, f_ctl); | |
1192 | ||
1193 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
1194 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
1195 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1196 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
1197 | ||
1198 | fr_sof(fp) = fr_sof(rx_fp); | |
1199 | if (f_ctl & FC_FC_END_SEQ) | |
1200 | fr_eof(fp) = FC_EOF_T; | |
1201 | else | |
1202 | fr_eof(fp) = FC_EOF_N; | |
1203 | ||
3a3b42bf | 1204 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1205 | } |
1206 | } | |
1207 | ||
3a3b42bf RL |
1208 | /** |
1209 | * fc_exch_send_ba_rjt() - Send BLS Reject | |
1210 | * @rx_fp: The frame being rejected | |
1211 | * @reason: The reason the frame is being rejected | |
25985edc | 1212 | * @explan: The explanation for the rejection |
3a3b42bf | 1213 | * |
42e9a92f RL |
1214 | * This is for rejecting BA_ABTS only. |
1215 | */ | |
b2ab99c9 RL |
1216 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
1217 | enum fc_ba_rjt_reason reason, | |
1218 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
1219 | { |
1220 | struct fc_frame *fp; | |
1221 | struct fc_frame_header *rx_fh; | |
1222 | struct fc_frame_header *fh; | |
1223 | struct fc_ba_rjt *rp; | |
3a3b42bf | 1224 | struct fc_lport *lport; |
42e9a92f RL |
1225 | unsigned int f_ctl; |
1226 | ||
3a3b42bf RL |
1227 | lport = fr_dev(rx_fp); |
1228 | fp = fc_frame_alloc(lport, sizeof(*rp)); | |
42e9a92f RL |
1229 | if (!fp) |
1230 | return; | |
1231 | fh = fc_frame_header_get(fp); | |
1232 | rx_fh = fc_frame_header_get(rx_fp); | |
1233 | ||
1234 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1235 | ||
1236 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1237 | rp->br_reason = reason; | |
1238 | rp->br_explan = explan; | |
1239 | ||
1240 | /* | |
1241 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1242 | */ | |
1243 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1244 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1d490ce3 JE |
1245 | fh->fh_ox_id = rx_fh->fh_ox_id; |
1246 | fh->fh_rx_id = rx_fh->fh_rx_id; | |
42e9a92f RL |
1247 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
1248 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1249 | fh->fh_type = FC_TYPE_BLS; | |
1250 | ||
1251 | /* | |
1252 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1253 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1254 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1255 | * Last ACK uses bits 7-6 (continue sequence), | |
1256 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1257 | * Always set LAST_SEQ, END_SEQ. | |
1258 | */ | |
1259 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1260 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1261 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1262 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1263 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1264 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1265 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1266 | hton24(fh->fh_f_ctl, f_ctl); | |
1267 | ||
1268 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1269 | fr_eof(fp) = FC_EOF_T; | |
1270 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1271 | fr_eof(fp) = FC_EOF_N; | |
1272 | ||
3a3b42bf | 1273 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1274 | } |
1275 | ||
3a3b42bf RL |
1276 | /** |
1277 | * fc_exch_recv_abts() - Handle an incoming ABTS | |
1278 | * @ep: The exchange the abort was on | |
1279 | * @rx_fp: The ABTS frame | |
1280 | * | |
1281 | * This would be for target mode usually, but could be due to lost | |
1282 | * FCP transfer ready, confirm or RRQ. We always handle this as an | |
1283 | * exchange abort, ignoring the parameter. | |
42e9a92f RL |
1284 | */ |
1285 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1286 | { | |
1287 | struct fc_frame *fp; | |
1288 | struct fc_ba_acc *ap; | |
1289 | struct fc_frame_header *fh; | |
1290 | struct fc_seq *sp; | |
1291 | ||
1292 | if (!ep) | |
1293 | goto reject; | |
1294 | spin_lock_bh(&ep->ex_lock); | |
1295 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1296 | spin_unlock_bh(&ep->ex_lock); | |
1297 | goto reject; | |
1298 | } | |
1299 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) | |
1300 | fc_exch_hold(ep); /* hold for REC_QUAL */ | |
1301 | ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL; | |
1302 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
1303 | ||
1304 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1305 | if (!fp) { | |
1306 | spin_unlock_bh(&ep->ex_lock); | |
1307 | goto free; | |
1308 | } | |
1309 | fh = fc_frame_header_get(fp); | |
1310 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1311 | memset(ap, 0, sizeof(*ap)); | |
1312 | sp = &ep->seq; | |
1313 | ap->ba_high_seq_cnt = htons(0xffff); | |
1314 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1315 | ap->ba_seq_id = sp->id; | |
1316 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1317 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1318 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1319 | } | |
a7e84f2b | 1320 | sp = fc_seq_start_next_locked(sp); |
42e9a92f | 1321 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); |
fb00cc23 | 1322 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
1323 | fc_frame_free(rx_fp); |
1324 | return; | |
1325 | ||
1326 | reject: | |
1327 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
1328 | free: | |
1329 | fc_frame_free(rx_fp); | |
1330 | } | |
1331 | ||
239e8104 JE |
1332 | /** |
1333 | * fc_seq_assign() - Assign exchange and sequence for incoming request | |
1334 | * @lport: The local port that received the request | |
1335 | * @fp: The request frame | |
1336 | * | |
1337 | * On success, the sequence pointer will be returned and also in fr_seq(@fp). | |
62bdb645 JE |
1338 | * A reference will be held on the exchange/sequence for the caller, which |
1339 | * must call fc_seq_release(). | |
239e8104 JE |
1340 | */ |
1341 | static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) | |
1342 | { | |
1343 | struct fc_exch_mgr_anchor *ema; | |
1344 | ||
1345 | WARN_ON(lport != fr_dev(fp)); | |
1346 | WARN_ON(fr_seq(fp)); | |
1347 | fr_seq(fp) = NULL; | |
1348 | ||
1349 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1350 | if ((!ema->match || ema->match(fp)) && | |
530994d6 | 1351 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) |
239e8104 JE |
1352 | break; |
1353 | return fr_seq(fp); | |
1354 | } | |
1355 | ||
62bdb645 JE |
1356 | /** |
1357 | * fc_seq_release() - Release the hold | |
1358 | * @sp: The sequence. | |
1359 | */ | |
1360 | static void fc_seq_release(struct fc_seq *sp) | |
1361 | { | |
1362 | fc_exch_release(fc_seq_exch(sp)); | |
1363 | } | |
1364 | ||
3a3b42bf | 1365 | /** |
92261156 | 1366 | * fc_exch_recv_req() - Handler for an incoming request |
3a3b42bf RL |
1367 | * @lport: The local port that received the request |
1368 | * @mp: The EM that the exchange is on | |
1369 | * @fp: The request frame | |
92261156 JE |
1370 | * |
1371 | * This is used when the other end is originating the exchange | |
1372 | * and the sequence. | |
42e9a92f | 1373 | */ |
3a3b42bf | 1374 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
42e9a92f RL |
1375 | struct fc_frame *fp) |
1376 | { | |
1377 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1378 | struct fc_seq *sp = NULL; | |
1379 | struct fc_exch *ep = NULL; | |
42e9a92f RL |
1380 | enum fc_pf_rjt_reason reject; |
1381 | ||
174e1ebf CL |
1382 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
1383 | * problem now that we know a new exchange needs to be allocated | |
1384 | */ | |
3a3b42bf RL |
1385 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
1386 | if (!lport) { | |
174e1ebf CL |
1387 | fc_frame_free(fp); |
1388 | return; | |
1389 | } | |
92261156 JE |
1390 | fr_dev(fp) = lport; |
1391 | ||
1392 | BUG_ON(fr_seq(fp)); /* XXX remove later */ | |
1393 | ||
1394 | /* | |
1395 | * If the RX_ID is 0xffff, don't allocate an exchange. | |
1396 | * The upper-level protocol may request one later, if needed. | |
1397 | */ | |
1398 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) | |
1399 | return lport->tt.lport_recv(lport, fp); | |
174e1ebf | 1400 | |
3a3b42bf | 1401 | reject = fc_seq_lookup_recip(lport, mp, fp); |
42e9a92f RL |
1402 | if (reject == FC_RJT_NONE) { |
1403 | sp = fr_seq(fp); /* sequence will be held */ | |
1404 | ep = fc_seq_exch(sp); | |
42e9a92f | 1405 | fc_seq_send_ack(sp, fp); |
f60e12e9 | 1406 | ep->encaps = fr_encaps(fp); |
42e9a92f RL |
1407 | |
1408 | /* | |
1409 | * Call the receive function. | |
1410 | * | |
1411 | * The receive function may allocate a new sequence | |
1412 | * over the old one, so we shouldn't change the | |
1413 | * sequence after this. | |
1414 | * | |
1415 | * The frame will be freed by the receive function. | |
1416 | * If new exch resp handler is valid then call that | |
1417 | * first. | |
1418 | */ | |
1419 | if (ep->resp) | |
1420 | ep->resp(sp, fp, ep->arg); | |
1421 | else | |
92261156 | 1422 | lport->tt.lport_recv(lport, fp); |
42e9a92f RL |
1423 | fc_exch_release(ep); /* release from lookup */ |
1424 | } else { | |
3a3b42bf RL |
1425 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
1426 | reject); | |
42e9a92f RL |
1427 | fc_frame_free(fp); |
1428 | } | |
1429 | } | |
1430 | ||
3a3b42bf RL |
1431 | /** |
1432 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other | |
1433 | * end is the originator of the sequence that is a | |
1434 | * response to our initial exchange | |
1435 | * @mp: The EM that the exchange is on | |
1436 | * @fp: The response frame | |
42e9a92f RL |
1437 | */ |
1438 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1439 | { | |
1440 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1441 | struct fc_seq *sp; | |
1442 | struct fc_exch *ep; | |
1443 | enum fc_sof sof; | |
1444 | u32 f_ctl; | |
1445 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1446 | void *ex_resp_arg; | |
1447 | int rc; | |
1448 | ||
1449 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1450 | if (!ep) { | |
1451 | atomic_inc(&mp->stats.xid_not_found); | |
1452 | goto out; | |
1453 | } | |
30121d14 SM |
1454 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1455 | atomic_inc(&mp->stats.xid_not_found); | |
8236554a | 1456 | goto rel; |
30121d14 | 1457 | } |
42e9a92f RL |
1458 | if (ep->rxid == FC_XID_UNKNOWN) |
1459 | ep->rxid = ntohs(fh->fh_rx_id); | |
1460 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1461 | atomic_inc(&mp->stats.xid_not_found); | |
1462 | goto rel; | |
1463 | } | |
1464 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1465 | ep->did != FC_FID_FLOGI) { | |
1466 | atomic_inc(&mp->stats.xid_not_found); | |
1467 | goto rel; | |
1468 | } | |
1469 | sof = fr_sof(fp); | |
a104c844 | 1470 | sp = &ep->seq; |
b3667f91 | 1471 | if (fc_sof_is_init(sof)) { |
42e9a92f | 1472 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 JE |
1473 | sp->id = fh->fh_seq_id; |
1474 | } else if (sp->id != fh->fh_seq_id) { | |
1475 | atomic_inc(&mp->stats.seq_not_found); | |
1476 | goto rel; | |
42e9a92f | 1477 | } |
a104c844 | 1478 | |
42e9a92f RL |
1479 | f_ctl = ntoh24(fh->fh_f_ctl); |
1480 | fr_seq(fp) = sp; | |
1481 | if (f_ctl & FC_FC_SEQ_INIT) | |
1482 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1483 | ||
1484 | if (fc_sof_needs_ack(sof)) | |
1485 | fc_seq_send_ack(sp, fp); | |
1486 | resp = ep->resp; | |
1487 | ex_resp_arg = ep->arg; | |
1488 | ||
1489 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1490 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1491 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1492 | spin_lock_bh(&ep->ex_lock); | |
8d23f4ba | 1493 | resp = ep->resp; |
42e9a92f RL |
1494 | rc = fc_exch_done_locked(ep); |
1495 | WARN_ON(fc_seq_exch(sp) != ep); | |
1496 | spin_unlock_bh(&ep->ex_lock); | |
1497 | if (!rc) | |
b2f0091f | 1498 | fc_exch_delete(ep); |
42e9a92f RL |
1499 | } |
1500 | ||
1501 | /* | |
1502 | * Call the receive function. | |
1503 | * The sequence is held (has a refcnt) for us, | |
1504 | * but not for the receive function. | |
1505 | * | |
1506 | * The receive function may allocate a new sequence | |
1507 | * over the old one, so we shouldn't change the | |
1508 | * sequence after this. | |
1509 | * | |
1510 | * The frame will be freed by the receive function. | |
1511 | * If new exch resp handler is valid then call that | |
1512 | * first. | |
1513 | */ | |
1514 | if (resp) | |
1515 | resp(sp, fp, ex_resp_arg); | |
1516 | else | |
1517 | fc_frame_free(fp); | |
1518 | fc_exch_release(ep); | |
1519 | return; | |
1520 | rel: | |
1521 | fc_exch_release(ep); | |
1522 | out: | |
1523 | fc_frame_free(fp); | |
1524 | } | |
1525 | ||
3a3b42bf RL |
1526 | /** |
1527 | * fc_exch_recv_resp() - Handler for a sequence where other end is | |
1528 | * responding to our sequence | |
1529 | * @mp: The EM that the exchange is on | |
1530 | * @fp: The response frame | |
42e9a92f RL |
1531 | */ |
1532 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1533 | { | |
1534 | struct fc_seq *sp; | |
1535 | ||
1536 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1537 | |
1538 | if (!sp) | |
42e9a92f | 1539 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1540 | else |
42e9a92f | 1541 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1542 | |
42e9a92f RL |
1543 | fc_frame_free(fp); |
1544 | } | |
1545 | ||
3a3b42bf RL |
1546 | /** |
1547 | * fc_exch_abts_resp() - Handler for a response to an ABT | |
1548 | * @ep: The exchange that the frame is on | |
1549 | * @fp: The response frame | |
1550 | * | |
1551 | * This response would be to an ABTS cancelling an exchange or sequence. | |
1552 | * The response can be either BA_ACC or BA_RJT | |
42e9a92f RL |
1553 | */ |
1554 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1555 | { | |
1556 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
1557 | void *ex_resp_arg; | |
1558 | struct fc_frame_header *fh; | |
1559 | struct fc_ba_acc *ap; | |
1560 | struct fc_seq *sp; | |
1561 | u16 low; | |
1562 | u16 high; | |
1563 | int rc = 1, has_rec = 0; | |
1564 | ||
1565 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1566 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1567 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f | 1568 | |
b29a4f30 VD |
1569 | if (cancel_delayed_work_sync(&ep->timeout_work)) { |
1570 | FC_EXCH_DBG(ep, "Exchange timer canceled\n"); | |
42e9a92f | 1571 | fc_exch_release(ep); /* release from pending timer hold */ |
b29a4f30 | 1572 | } |
42e9a92f RL |
1573 | |
1574 | spin_lock_bh(&ep->ex_lock); | |
1575 | switch (fh->fh_r_ctl) { | |
1576 | case FC_RCTL_BA_ACC: | |
1577 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1578 | if (!ap) | |
1579 | break; | |
1580 | ||
1581 | /* | |
1582 | * Decide whether to establish a Recovery Qualifier. | |
1583 | * We do this if there is a non-empty SEQ_CNT range and | |
1584 | * SEQ_ID is the same as the one we aborted. | |
1585 | */ | |
1586 | low = ntohs(ap->ba_low_seq_cnt); | |
1587 | high = ntohs(ap->ba_high_seq_cnt); | |
1588 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1589 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1590 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1591 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1592 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1593 | has_rec = 1; | |
1594 | } | |
1595 | break; | |
1596 | case FC_RCTL_BA_RJT: | |
1597 | break; | |
1598 | default: | |
1599 | break; | |
1600 | } | |
1601 | ||
1602 | resp = ep->resp; | |
1603 | ex_resp_arg = ep->arg; | |
1604 | ||
1605 | /* do we need to do some other checks here. Can we reuse more of | |
1606 | * fc_exch_recv_seq_resp | |
1607 | */ | |
1608 | sp = &ep->seq; | |
1609 | /* | |
1610 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1611 | */ | |
1612 | if (ep->fh_type != FC_TYPE_FCP && | |
1613 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1614 | rc = fc_exch_done_locked(ep); | |
1615 | spin_unlock_bh(&ep->ex_lock); | |
1616 | if (!rc) | |
b2f0091f | 1617 | fc_exch_delete(ep); |
42e9a92f RL |
1618 | |
1619 | if (resp) | |
1620 | resp(sp, fp, ex_resp_arg); | |
1621 | else | |
1622 | fc_frame_free(fp); | |
1623 | ||
1624 | if (has_rec) | |
1625 | fc_exch_timer_set(ep, ep->r_a_tov); | |
1626 | ||
1627 | } | |
1628 | ||
3a3b42bf RL |
1629 | /** |
1630 | * fc_exch_recv_bls() - Handler for a BLS sequence | |
1631 | * @mp: The EM that the exchange is on | |
1632 | * @fp: The request frame | |
1633 | * | |
1634 | * The BLS frame is always a sequence initiated by the remote side. | |
42e9a92f RL |
1635 | * We may be either the originator or recipient of the exchange. |
1636 | */ | |
1637 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1638 | { | |
1639 | struct fc_frame_header *fh; | |
1640 | struct fc_exch *ep; | |
1641 | u32 f_ctl; | |
1642 | ||
1643 | fh = fc_frame_header_get(fp); | |
1644 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1645 | fr_seq(fp) = NULL; | |
1646 | ||
1647 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1648 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1649 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1650 | spin_lock_bh(&ep->ex_lock); | |
1651 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1652 | spin_unlock_bh(&ep->ex_lock); | |
1653 | } | |
1654 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1655 | /* | |
1656 | * A response to a sequence we initiated. | |
1657 | * This should only be ACKs for class 2 or F. | |
1658 | */ | |
1659 | switch (fh->fh_r_ctl) { | |
1660 | case FC_RCTL_ACK_1: | |
1661 | case FC_RCTL_ACK_0: | |
1662 | break; | |
1663 | default: | |
d4042e9c BPG |
1664 | if (ep) |
1665 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received", | |
1666 | fh->fh_r_ctl, | |
1667 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1668 | break; |
1669 | } | |
1670 | fc_frame_free(fp); | |
1671 | } else { | |
1672 | switch (fh->fh_r_ctl) { | |
1673 | case FC_RCTL_BA_RJT: | |
1674 | case FC_RCTL_BA_ACC: | |
1675 | if (ep) | |
1676 | fc_exch_abts_resp(ep, fp); | |
1677 | else | |
1678 | fc_frame_free(fp); | |
1679 | break; | |
1680 | case FC_RCTL_BA_ABTS: | |
1681 | fc_exch_recv_abts(ep, fp); | |
1682 | break; | |
1683 | default: /* ignore junk */ | |
1684 | fc_frame_free(fp); | |
1685 | break; | |
1686 | } | |
1687 | } | |
1688 | if (ep) | |
1689 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1690 | } | |
1691 | ||
3a3b42bf RL |
1692 | /** |
1693 | * fc_seq_ls_acc() - Accept sequence with LS_ACC | |
92261156 | 1694 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1695 | * |
42e9a92f RL |
1696 | * If this fails due to allocation or transmit congestion, assume the |
1697 | * originator will repeat the sequence. | |
1698 | */ | |
92261156 | 1699 | static void fc_seq_ls_acc(struct fc_frame *rx_fp) |
42e9a92f | 1700 | { |
92261156 | 1701 | struct fc_lport *lport; |
42e9a92f RL |
1702 | struct fc_els_ls_acc *acc; |
1703 | struct fc_frame *fp; | |
1704 | ||
92261156 JE |
1705 | lport = fr_dev(rx_fp); |
1706 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1707 | if (!fp) | |
1708 | return; | |
1709 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1710 | memset(acc, 0, sizeof(*acc)); | |
1711 | acc->la_cmd = ELS_LS_ACC; | |
1712 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1713 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1714 | } |
1715 | ||
3a3b42bf RL |
1716 | /** |
1717 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT | |
92261156 | 1718 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1719 | * @reason: The reason the sequence is being rejected |
92261156 | 1720 | * @explan: The explanation for the rejection |
3a3b42bf | 1721 | * |
42e9a92f RL |
1722 | * If this fails due to allocation or transmit congestion, assume the |
1723 | * originator will repeat the sequence. | |
1724 | */ | |
92261156 | 1725 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, |
42e9a92f RL |
1726 | enum fc_els_rjt_explan explan) |
1727 | { | |
92261156 | 1728 | struct fc_lport *lport; |
42e9a92f RL |
1729 | struct fc_els_ls_rjt *rjt; |
1730 | struct fc_frame *fp; | |
1731 | ||
92261156 JE |
1732 | lport = fr_dev(rx_fp); |
1733 | fp = fc_frame_alloc(lport, sizeof(*rjt)); | |
1734 | if (!fp) | |
1735 | return; | |
1736 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1737 | memset(rjt, 0, sizeof(*rjt)); | |
1738 | rjt->er_cmd = ELS_LS_RJT; | |
1739 | rjt->er_reason = reason; | |
1740 | rjt->er_explan = explan; | |
1741 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1742 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1743 | } |
1744 | ||
3a3b42bf RL |
1745 | /** |
1746 | * fc_exch_reset() - Reset an exchange | |
1747 | * @ep: The exchange to be reset | |
1748 | */ | |
42e9a92f RL |
1749 | static void fc_exch_reset(struct fc_exch *ep) |
1750 | { | |
1751 | struct fc_seq *sp; | |
1752 | void (*resp)(struct fc_seq *, struct fc_frame *, void *); | |
1753 | void *arg; | |
1754 | int rc = 1; | |
1755 | ||
1756 | spin_lock_bh(&ep->ex_lock); | |
77a2b73a | 1757 | fc_exch_abort_locked(ep, 0); |
42e9a92f | 1758 | ep->state |= FC_EX_RST_CLEANUP; |
b29a4f30 | 1759 | fc_exch_timer_cancel(ep); |
42e9a92f RL |
1760 | resp = ep->resp; |
1761 | ep->resp = NULL; | |
1762 | if (ep->esb_stat & ESB_ST_REC_QUAL) | |
1763 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1764 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
1765 | arg = ep->arg; | |
1766 | sp = &ep->seq; | |
1767 | rc = fc_exch_done_locked(ep); | |
1768 | spin_unlock_bh(&ep->ex_lock); | |
1769 | if (!rc) | |
b2f0091f | 1770 | fc_exch_delete(ep); |
42e9a92f RL |
1771 | |
1772 | if (resp) | |
1773 | resp(sp, ERR_PTR(-FC_EX_CLOSED), arg); | |
1774 | } | |
1775 | ||
b2f0091f | 1776 | /** |
3a3b42bf RL |
1777 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
1778 | * @lport: The local port that the exchange pool is on | |
1779 | * @pool: The exchange pool to be reset | |
1780 | * @sid: The source ID | |
1781 | * @did: The destination ID | |
b2f0091f | 1782 | * |
3a3b42bf RL |
1783 | * Resets a per cpu exches pool, releasing all of its sequences |
1784 | * and exchanges. If sid is non-zero then reset only exchanges | |
1785 | * we sourced from the local port's FID. If did is non-zero then | |
1786 | * only reset exchanges destined for the local port's FID. | |
42e9a92f | 1787 | */ |
b2f0091f VD |
1788 | static void fc_exch_pool_reset(struct fc_lport *lport, |
1789 | struct fc_exch_pool *pool, | |
1790 | u32 sid, u32 did) | |
42e9a92f RL |
1791 | { |
1792 | struct fc_exch *ep; | |
1793 | struct fc_exch *next; | |
1794 | ||
b2f0091f | 1795 | spin_lock_bh(&pool->lock); |
42e9a92f | 1796 | restart: |
b2f0091f VD |
1797 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
1798 | if ((lport == ep->lp) && | |
1799 | (sid == 0 || sid == ep->sid) && | |
1800 | (did == 0 || did == ep->did)) { | |
1801 | fc_exch_hold(ep); | |
1802 | spin_unlock_bh(&pool->lock); | |
1803 | ||
1804 | fc_exch_reset(ep); | |
1805 | ||
1806 | fc_exch_release(ep); | |
1807 | spin_lock_bh(&pool->lock); | |
1808 | ||
1809 | /* | |
1810 | * must restart loop incase while lock | |
1811 | * was down multiple eps were released. | |
1812 | */ | |
1813 | goto restart; | |
42e9a92f | 1814 | } |
b2f0091f | 1815 | } |
b6e3c840 VD |
1816 | pool->next_index = 0; |
1817 | pool->left = FC_XID_UNKNOWN; | |
1818 | pool->right = FC_XID_UNKNOWN; | |
b2f0091f VD |
1819 | spin_unlock_bh(&pool->lock); |
1820 | } | |
1821 | ||
1822 | /** | |
3a3b42bf RL |
1823 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
1824 | * @lport: The local port whose EMs are to be reset | |
1825 | * @sid: The source ID | |
1826 | * @did: The destination ID | |
b2f0091f | 1827 | * |
3a3b42bf RL |
1828 | * Reset all EMs associated with a given local port. Release all |
1829 | * sequences and exchanges. If sid is non-zero then reset only the | |
1830 | * exchanges sent from the local port's FID. If did is non-zero then | |
1831 | * reset only exchanges destined for the local port's FID. | |
b2f0091f VD |
1832 | */ |
1833 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) | |
1834 | { | |
1835 | struct fc_exch_mgr_anchor *ema; | |
1836 | unsigned int cpu; | |
1837 | ||
1838 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
1839 | for_each_possible_cpu(cpu) | |
1840 | fc_exch_pool_reset(lport, | |
1841 | per_cpu_ptr(ema->mp->pool, cpu), | |
1842 | sid, did); | |
42e9a92f | 1843 | } |
42e9a92f RL |
1844 | } |
1845 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1846 | ||
92261156 JE |
1847 | /** |
1848 | * fc_exch_lookup() - find an exchange | |
1849 | * @lport: The local port | |
1850 | * @xid: The exchange ID | |
1851 | * | |
1852 | * Returns exchange pointer with hold for caller, or NULL if not found. | |
1853 | */ | |
1854 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) | |
1855 | { | |
1856 | struct fc_exch_mgr_anchor *ema; | |
1857 | ||
1858 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1859 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) | |
1860 | return fc_exch_find(ema->mp, xid); | |
1861 | return NULL; | |
1862 | } | |
1863 | ||
3a3b42bf RL |
1864 | /** |
1865 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests | |
92261156 | 1866 | * @rfp: The REC frame, not freed here. |
3a3b42bf | 1867 | * |
42e9a92f RL |
1868 | * Note that the requesting port may be different than the S_ID in the request. |
1869 | */ | |
92261156 | 1870 | static void fc_exch_els_rec(struct fc_frame *rfp) |
42e9a92f | 1871 | { |
92261156 | 1872 | struct fc_lport *lport; |
42e9a92f RL |
1873 | struct fc_frame *fp; |
1874 | struct fc_exch *ep; | |
42e9a92f RL |
1875 | struct fc_els_rec *rp; |
1876 | struct fc_els_rec_acc *acc; | |
1877 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1878 | enum fc_els_rjt_explan explan; | |
1879 | u32 sid; | |
1880 | u16 rxid; | |
1881 | u16 oxid; | |
1882 | ||
92261156 | 1883 | lport = fr_dev(rfp); |
42e9a92f RL |
1884 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); |
1885 | explan = ELS_EXPL_INV_LEN; | |
1886 | if (!rp) | |
1887 | goto reject; | |
1888 | sid = ntoh24(rp->rec_s_id); | |
1889 | rxid = ntohs(rp->rec_rx_id); | |
1890 | oxid = ntohs(rp->rec_ox_id); | |
1891 | ||
92261156 JE |
1892 | ep = fc_exch_lookup(lport, |
1893 | sid == fc_host_port_id(lport->host) ? oxid : rxid); | |
42e9a92f | 1894 | explan = ELS_EXPL_OXID_RXID; |
92261156 JE |
1895 | if (!ep) |
1896 | goto reject; | |
1897 | if (ep->oid != sid || oxid != ep->oxid) | |
1898 | goto rel; | |
1899 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) | |
1900 | goto rel; | |
1901 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1902 | if (!fp) | |
42e9a92f | 1903 | goto out; |
92261156 | 1904 | |
42e9a92f RL |
1905 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
1906 | memset(acc, 0, sizeof(*acc)); | |
1907 | acc->reca_cmd = ELS_LS_ACC; | |
1908 | acc->reca_ox_id = rp->rec_ox_id; | |
1909 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1910 | acc->reca_rx_id = htons(ep->rxid); | |
1911 | if (ep->sid == ep->oid) | |
1912 | hton24(acc->reca_rfid, ep->did); | |
1913 | else | |
1914 | hton24(acc->reca_rfid, ep->sid); | |
1915 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1916 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1917 | ESB_ST_SEQ_INIT | | |
1918 | ESB_ST_COMPLETE)); | |
92261156 JE |
1919 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); |
1920 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1921 | out: |
1922 | fc_exch_release(ep); | |
42e9a92f RL |
1923 | return; |
1924 | ||
1925 | rel: | |
1926 | fc_exch_release(ep); | |
1927 | reject: | |
92261156 | 1928 | fc_seq_ls_rjt(rfp, reason, explan); |
42e9a92f RL |
1929 | } |
1930 | ||
3a3b42bf RL |
1931 | /** |
1932 | * fc_exch_rrq_resp() - Handler for RRQ responses | |
1933 | * @sp: The sequence that the RRQ is on | |
1934 | * @fp: The RRQ frame | |
1935 | * @arg: The exchange that the RRQ is on | |
42e9a92f RL |
1936 | * |
1937 | * TODO: fix error handler. | |
1938 | */ | |
1939 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
1940 | { | |
1941 | struct fc_exch *aborted_ep = arg; | |
1942 | unsigned int op; | |
1943 | ||
1944 | if (IS_ERR(fp)) { | |
1945 | int err = PTR_ERR(fp); | |
1946 | ||
78342da3 | 1947 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 1948 | goto cleanup; |
7414705e RL |
1949 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
1950 | "frame error %d\n", err); | |
42e9a92f RL |
1951 | return; |
1952 | } | |
1953 | ||
1954 | op = fc_frame_payload_op(fp); | |
1955 | fc_frame_free(fp); | |
1956 | ||
1957 | switch (op) { | |
1958 | case ELS_LS_RJT: | |
7414705e | 1959 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ"); |
42e9a92f RL |
1960 | /* fall through */ |
1961 | case ELS_LS_ACC: | |
1962 | goto cleanup; | |
1963 | default: | |
7414705e RL |
1964 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x " |
1965 | "for RRQ", op); | |
42e9a92f RL |
1966 | return; |
1967 | } | |
1968 | ||
1969 | cleanup: | |
1970 | fc_exch_done(&aborted_ep->seq); | |
1971 | /* drop hold for rec qual */ | |
1972 | fc_exch_release(aborted_ep); | |
1973 | } | |
1974 | ||
1a7b75ae RL |
1975 | |
1976 | /** | |
3a3b42bf RL |
1977 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
1978 | * @lport: The local port to send the frame on | |
1979 | * @fp: The frame to be sent | |
1980 | * @resp: The response handler for this request | |
1981 | * @destructor: The destructor for the exchange | |
1982 | * @arg: The argument to be passed to the response handler | |
1983 | * @timer_msec: The timeout period for the exchange | |
1984 | * | |
1985 | * The frame pointer with some of the header's fields must be | |
1986 | * filled before calling this routine, those fields are: | |
1987 | * | |
1988 | * - routing control | |
1989 | * - FC port did | |
1990 | * - FC port sid | |
1991 | * - FC header type | |
1992 | * - frame control | |
1993 | * - parameter or relative offset | |
1a7b75ae | 1994 | */ |
3a3b42bf | 1995 | static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
1a7b75ae RL |
1996 | struct fc_frame *fp, |
1997 | void (*resp)(struct fc_seq *, | |
1998 | struct fc_frame *fp, | |
1999 | void *arg), | |
2000 | void (*destructor)(struct fc_seq *, | |
2001 | void *), | |
2002 | void *arg, u32 timer_msec) | |
2003 | { | |
2004 | struct fc_exch *ep; | |
2005 | struct fc_seq *sp = NULL; | |
2006 | struct fc_frame_header *fh; | |
3ee17f59 | 2007 | struct fc_fcp_pkt *fsp = NULL; |
1a7b75ae RL |
2008 | int rc = 1; |
2009 | ||
3a3b42bf | 2010 | ep = fc_exch_alloc(lport, fp); |
1a7b75ae RL |
2011 | if (!ep) { |
2012 | fc_frame_free(fp); | |
2013 | return NULL; | |
2014 | } | |
2015 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
2016 | fh = fc_frame_header_get(fp); | |
2017 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
2018 | ep->resp = resp; | |
2019 | ep->destructor = destructor; | |
2020 | ep->arg = arg; | |
2021 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
3a3b42bf | 2022 | ep->lp = lport; |
1a7b75ae RL |
2023 | sp = &ep->seq; |
2024 | ||
2025 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
2026 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
2027 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
2028 | sp->cnt++; | |
2029 | ||
3ee17f59 YZ |
2030 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) { |
2031 | fsp = fr_fsp(fp); | |
1a7b75ae | 2032 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
3ee17f59 | 2033 | } |
1a7b75ae | 2034 | |
3a3b42bf | 2035 | if (unlikely(lport->tt.frame_send(lport, fp))) |
1a7b75ae RL |
2036 | goto err; |
2037 | ||
2038 | if (timer_msec) | |
2039 | fc_exch_timer_set_locked(ep, timer_msec); | |
2040 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
2041 | ||
2042 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
2043 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
2044 | spin_unlock_bh(&ep->ex_lock); | |
2045 | return sp; | |
2046 | err: | |
3ee17f59 YZ |
2047 | if (fsp) |
2048 | fc_fcp_ddp_done(fsp); | |
1a7b75ae RL |
2049 | rc = fc_exch_done_locked(ep); |
2050 | spin_unlock_bh(&ep->ex_lock); | |
2051 | if (!rc) | |
2052 | fc_exch_delete(ep); | |
2053 | return NULL; | |
2054 | } | |
2055 | ||
3a3b42bf RL |
2056 | /** |
2057 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command | |
2058 | * @ep: The exchange to send the RRQ on | |
2059 | * | |
42e9a92f RL |
2060 | * This tells the remote port to stop blocking the use of |
2061 | * the exchange and the seq_cnt range. | |
2062 | */ | |
2063 | static void fc_exch_rrq(struct fc_exch *ep) | |
2064 | { | |
3a3b42bf | 2065 | struct fc_lport *lport; |
42e9a92f RL |
2066 | struct fc_els_rrq *rrq; |
2067 | struct fc_frame *fp; | |
42e9a92f RL |
2068 | u32 did; |
2069 | ||
3a3b42bf | 2070 | lport = ep->lp; |
42e9a92f | 2071 | |
3a3b42bf | 2072 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
42e9a92f | 2073 | if (!fp) |
a0cc1ecc VD |
2074 | goto retry; |
2075 | ||
42e9a92f RL |
2076 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
2077 | memset(rrq, 0, sizeof(*rrq)); | |
2078 | rrq->rrq_cmd = ELS_RRQ; | |
2079 | hton24(rrq->rrq_s_id, ep->sid); | |
2080 | rrq->rrq_ox_id = htons(ep->oxid); | |
2081 | rrq->rrq_rx_id = htons(ep->rxid); | |
2082 | ||
2083 | did = ep->did; | |
2084 | if (ep->esb_stat & ESB_ST_RESP) | |
2085 | did = ep->sid; | |
2086 | ||
2087 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
7b2787ec | 2088 | lport->port_id, FC_TYPE_ELS, |
42e9a92f RL |
2089 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
2090 | ||
3a3b42bf RL |
2091 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
2092 | lport->e_d_tov)) | |
a0cc1ecc VD |
2093 | return; |
2094 | ||
2095 | retry: | |
2096 | spin_lock_bh(&ep->ex_lock); | |
2097 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
2098 | spin_unlock_bh(&ep->ex_lock); | |
2099 | /* drop hold for rec qual */ | |
2100 | fc_exch_release(ep); | |
42e9a92f RL |
2101 | return; |
2102 | } | |
a0cc1ecc VD |
2103 | ep->esb_stat |= ESB_ST_REC_QUAL; |
2104 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
2105 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
2106 | } |
2107 | ||
3a3b42bf RL |
2108 | /** |
2109 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests | |
92261156 | 2110 | * @fp: The RRQ frame, not freed here. |
42e9a92f | 2111 | */ |
92261156 | 2112 | static void fc_exch_els_rrq(struct fc_frame *fp) |
42e9a92f | 2113 | { |
92261156 | 2114 | struct fc_lport *lport; |
3f127ad9 | 2115 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
42e9a92f RL |
2116 | struct fc_els_rrq *rp; |
2117 | u32 sid; | |
2118 | u16 xid; | |
2119 | enum fc_els_rjt_explan explan; | |
2120 | ||
92261156 | 2121 | lport = fr_dev(fp); |
42e9a92f RL |
2122 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
2123 | explan = ELS_EXPL_INV_LEN; | |
2124 | if (!rp) | |
2125 | goto reject; | |
2126 | ||
2127 | /* | |
2128 | * lookup subject exchange. | |
2129 | */ | |
42e9a92f | 2130 | sid = ntoh24(rp->rrq_s_id); /* subject source */ |
92261156 JE |
2131 | xid = fc_host_port_id(lport->host) == sid ? |
2132 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
2133 | ep = fc_exch_lookup(lport, xid); | |
42e9a92f RL |
2134 | explan = ELS_EXPL_OXID_RXID; |
2135 | if (!ep) | |
2136 | goto reject; | |
2137 | spin_lock_bh(&ep->ex_lock); | |
2138 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
2139 | goto unlock_reject; | |
2140 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
2141 | ep->rxid != FC_XID_UNKNOWN) | |
2142 | goto unlock_reject; | |
2143 | explan = ELS_EXPL_SID; | |
2144 | if (ep->sid != sid) | |
2145 | goto unlock_reject; | |
2146 | ||
2147 | /* | |
2148 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
2149 | */ | |
2150 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
2151 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
2152 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
2153 | } | |
b29a4f30 VD |
2154 | if (ep->esb_stat & ESB_ST_COMPLETE) |
2155 | fc_exch_timer_cancel(ep); | |
42e9a92f RL |
2156 | |
2157 | spin_unlock_bh(&ep->ex_lock); | |
2158 | ||
2159 | /* | |
2160 | * Send LS_ACC. | |
2161 | */ | |
92261156 | 2162 | fc_seq_ls_acc(fp); |
3f127ad9 | 2163 | goto out; |
42e9a92f RL |
2164 | |
2165 | unlock_reject: | |
2166 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f | 2167 | reject: |
92261156 | 2168 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); |
3f127ad9 | 2169 | out: |
3f127ad9 VD |
2170 | if (ep) |
2171 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
42e9a92f RL |
2172 | } |
2173 | ||
4e5fae7a VD |
2174 | /** |
2175 | * fc_exch_update_stats() - update exches stats to lport | |
2176 | * @lport: The local port to update exchange manager stats | |
2177 | */ | |
2178 | void fc_exch_update_stats(struct fc_lport *lport) | |
2179 | { | |
2180 | struct fc_host_statistics *st; | |
2181 | struct fc_exch_mgr_anchor *ema; | |
2182 | struct fc_exch_mgr *mp; | |
2183 | ||
2184 | st = &lport->host_stats; | |
2185 | ||
2186 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2187 | mp = ema->mp; | |
2188 | st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch); | |
2189 | st->fc_no_free_exch_xid += | |
2190 | atomic_read(&mp->stats.no_free_exch_xid); | |
2191 | st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found); | |
2192 | st->fc_xid_busy += atomic_read(&mp->stats.xid_busy); | |
2193 | st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found); | |
2194 | st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp); | |
2195 | } | |
2196 | } | |
2197 | EXPORT_SYMBOL(fc_exch_update_stats); | |
2198 | ||
3a3b42bf RL |
2199 | /** |
2200 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs | |
2201 | * @lport: The local port to add the exchange manager to | |
2202 | * @mp: The exchange manager to be added to the local port | |
2203 | * @match: The match routine that indicates when this EM should be used | |
2204 | */ | |
96316099 VD |
2205 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
2206 | struct fc_exch_mgr *mp, | |
2207 | bool (*match)(struct fc_frame *)) | |
2208 | { | |
2209 | struct fc_exch_mgr_anchor *ema; | |
2210 | ||
2211 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
2212 | if (!ema) | |
2213 | return ema; | |
2214 | ||
2215 | ema->mp = mp; | |
2216 | ema->match = match; | |
2217 | /* add EM anchor to EM anchors list */ | |
2218 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
2219 | kref_get(&mp->kref); | |
2220 | return ema; | |
2221 | } | |
2222 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
2223 | ||
3a3b42bf RL |
2224 | /** |
2225 | * fc_exch_mgr_destroy() - Destroy an exchange manager | |
2226 | * @kref: The reference to the EM to be destroyed | |
2227 | */ | |
96316099 VD |
2228 | static void fc_exch_mgr_destroy(struct kref *kref) |
2229 | { | |
2230 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
2231 | ||
96316099 | 2232 | mempool_destroy(mp->ep_pool); |
e4bc50be | 2233 | free_percpu(mp->pool); |
96316099 VD |
2234 | kfree(mp); |
2235 | } | |
2236 | ||
3a3b42bf RL |
2237 | /** |
2238 | * fc_exch_mgr_del() - Delete an EM from a local port's list | |
2239 | * @ema: The exchange manager anchor identifying the EM to be deleted | |
2240 | */ | |
96316099 VD |
2241 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
2242 | { | |
2243 | /* remove EM anchor from EM anchors list */ | |
2244 | list_del(&ema->ema_list); | |
2245 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
2246 | kfree(ema); | |
2247 | } | |
2248 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
2249 | ||
174e1ebf | 2250 | /** |
3a3b42bf RL |
2251 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
2252 | * @src: Source lport to clone exchange managers from | |
2253 | * @dst: New lport that takes references to all the exchange managers | |
174e1ebf CL |
2254 | */ |
2255 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) | |
2256 | { | |
2257 | struct fc_exch_mgr_anchor *ema, *tmp; | |
2258 | ||
2259 | list_for_each_entry(ema, &src->ema_list, ema_list) { | |
2260 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) | |
2261 | goto err; | |
2262 | } | |
2263 | return 0; | |
2264 | err: | |
2265 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) | |
2266 | fc_exch_mgr_del(ema); | |
2267 | return -ENOMEM; | |
2268 | } | |
72fa396b | 2269 | EXPORT_SYMBOL(fc_exch_mgr_list_clone); |
174e1ebf | 2270 | |
3a3b42bf RL |
2271 | /** |
2272 | * fc_exch_mgr_alloc() - Allocate an exchange manager | |
2273 | * @lport: The local port that the new EM will be associated with | |
2274 | * @class: The default FC class for new exchanges | |
2275 | * @min_xid: The minimum XID for exchanges from the new EM | |
2276 | * @max_xid: The maximum XID for exchanges from the new EM | |
2277 | * @match: The match routine for the new EM | |
2278 | */ | |
2279 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, | |
42e9a92f | 2280 | enum fc_class class, |
52ff878c VD |
2281 | u16 min_xid, u16 max_xid, |
2282 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
2283 | { |
2284 | struct fc_exch_mgr *mp; | |
e4bc50be VD |
2285 | u16 pool_exch_range; |
2286 | size_t pool_size; | |
2287 | unsigned int cpu; | |
2288 | struct fc_exch_pool *pool; | |
42e9a92f | 2289 | |
e4bc50be VD |
2290 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
2291 | (min_xid & fc_cpu_mask) != 0) { | |
3a3b42bf | 2292 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
7414705e | 2293 | min_xid, max_xid); |
42e9a92f RL |
2294 | return NULL; |
2295 | } | |
2296 | ||
2297 | /* | |
b2f0091f | 2298 | * allocate memory for EM |
42e9a92f | 2299 | */ |
b2f0091f | 2300 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
42e9a92f RL |
2301 | if (!mp) |
2302 | return NULL; | |
2303 | ||
2304 | mp->class = class; | |
42e9a92f RL |
2305 | /* adjust em exch xid range for offload */ |
2306 | mp->min_xid = min_xid; | |
011a9008 SC |
2307 | |
2308 | /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */ | |
2309 | pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) / | |
2310 | sizeof(struct fc_exch *); | |
2311 | if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) { | |
2312 | mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) + | |
2313 | min_xid - 1; | |
2314 | } else { | |
2315 | mp->max_xid = max_xid; | |
2316 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / | |
2317 | (fc_cpu_mask + 1); | |
2318 | } | |
42e9a92f RL |
2319 | |
2320 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
2321 | if (!mp->ep_pool) | |
2322 | goto free_mp; | |
2323 | ||
e4bc50be VD |
2324 | /* |
2325 | * Setup per cpu exch pool with entire exchange id range equally | |
2326 | * divided across all cpus. The exch pointers array memory is | |
2327 | * allocated for exch range per pool. | |
2328 | */ | |
e4bc50be VD |
2329 | mp->pool_max_index = pool_exch_range - 1; |
2330 | ||
2331 | /* | |
2332 | * Allocate and initialize per cpu exch pool | |
2333 | */ | |
2334 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
2335 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
2336 | if (!mp->pool) | |
2337 | goto free_mempool; | |
2338 | for_each_possible_cpu(cpu) { | |
2339 | pool = per_cpu_ptr(mp->pool, cpu); | |
b6e3c840 | 2340 | pool->next_index = 0; |
2034c19c HD |
2341 | pool->left = FC_XID_UNKNOWN; |
2342 | pool->right = FC_XID_UNKNOWN; | |
e4bc50be VD |
2343 | spin_lock_init(&pool->lock); |
2344 | INIT_LIST_HEAD(&pool->ex_list); | |
2345 | } | |
2346 | ||
52ff878c | 2347 | kref_init(&mp->kref); |
3a3b42bf | 2348 | if (!fc_exch_mgr_add(lport, mp, match)) { |
e4bc50be VD |
2349 | free_percpu(mp->pool); |
2350 | goto free_mempool; | |
52ff878c VD |
2351 | } |
2352 | ||
2353 | /* | |
2354 | * Above kref_init() sets mp->kref to 1 and then | |
2355 | * call to fc_exch_mgr_add incremented mp->kref again, | |
2356 | * so adjust that extra increment. | |
2357 | */ | |
2358 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
2359 | return mp; |
2360 | ||
e4bc50be VD |
2361 | free_mempool: |
2362 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
2363 | free_mp: |
2364 | kfree(mp); | |
2365 | return NULL; | |
2366 | } | |
2367 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
2368 | ||
3a3b42bf RL |
2369 | /** |
2370 | * fc_exch_mgr_free() - Free all exchange managers on a local port | |
2371 | * @lport: The local port whose EMs are to be freed | |
2372 | */ | |
52ff878c | 2373 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 2374 | { |
52ff878c VD |
2375 | struct fc_exch_mgr_anchor *ema, *next; |
2376 | ||
4ae1e19f | 2377 | flush_workqueue(fc_exch_workqueue); |
52ff878c VD |
2378 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
2379 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
2380 | } |
2381 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
2382 | ||
6c8cc1c0 KP |
2383 | /** |
2384 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending | |
2385 | * upon 'xid'. | |
2386 | * @f_ctl: f_ctl | |
2387 | * @lport: The local port the frame was received on | |
2388 | * @fh: The received frame header | |
2389 | */ | |
2390 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, | |
2391 | struct fc_lport *lport, | |
2392 | struct fc_frame_header *fh) | |
2393 | { | |
2394 | struct fc_exch_mgr_anchor *ema; | |
2395 | u16 xid; | |
2396 | ||
2397 | if (f_ctl & FC_FC_EX_CTX) | |
2398 | xid = ntohs(fh->fh_ox_id); | |
2399 | else { | |
2400 | xid = ntohs(fh->fh_rx_id); | |
2401 | if (xid == FC_XID_UNKNOWN) | |
2402 | return list_entry(lport->ema_list.prev, | |
2403 | typeof(*ema), ema_list); | |
2404 | } | |
2405 | ||
2406 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2407 | if ((xid >= ema->mp->min_xid) && | |
2408 | (xid <= ema->mp->max_xid)) | |
2409 | return ema; | |
2410 | } | |
2411 | return NULL; | |
2412 | } | |
3a3b42bf RL |
2413 | /** |
2414 | * fc_exch_recv() - Handler for received frames | |
2415 | * @lport: The local port the frame was received on | |
6c8cc1c0 | 2416 | * @fp: The received frame |
42e9a92f | 2417 | */ |
3a3b42bf | 2418 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
2419 | { |
2420 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c | 2421 | struct fc_exch_mgr_anchor *ema; |
6c8cc1c0 | 2422 | u32 f_ctl; |
42e9a92f RL |
2423 | |
2424 | /* lport lock ? */ | |
3a3b42bf RL |
2425 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
2426 | FC_LPORT_DBG(lport, "Receiving frames for an lport that " | |
7414705e | 2427 | "has not been initialized correctly\n"); |
42e9a92f RL |
2428 | fc_frame_free(fp); |
2429 | return; | |
2430 | } | |
2431 | ||
52ff878c | 2432 | f_ctl = ntoh24(fh->fh_f_ctl); |
6c8cc1c0 KP |
2433 | ema = fc_find_ema(f_ctl, lport, fh); |
2434 | if (!ema) { | |
2435 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," | |
2436 | "fc_ctl <0x%x>, xid <0x%x>\n", | |
2437 | f_ctl, | |
2438 | (f_ctl & FC_FC_EX_CTX) ? | |
2439 | ntohs(fh->fh_ox_id) : | |
2440 | ntohs(fh->fh_rx_id)); | |
2441 | fc_frame_free(fp); | |
2442 | return; | |
2443 | } | |
52ff878c | 2444 | |
42e9a92f RL |
2445 | /* |
2446 | * If frame is marked invalid, just drop it. | |
2447 | */ | |
42e9a92f RL |
2448 | switch (fr_eof(fp)) { |
2449 | case FC_EOF_T: | |
2450 | if (f_ctl & FC_FC_END_SEQ) | |
2451 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
2452 | /* fall through */ | |
2453 | case FC_EOF_N: | |
2454 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2455 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2456 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2457 | FC_FC_EX_CTX) | |
52ff878c | 2458 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2459 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2460 | fc_exch_recv_resp(ema->mp, fp); |
92261156 | 2461 | else /* no EX_CTX and no SEQ_CTX */ |
3a3b42bf | 2462 | fc_exch_recv_req(lport, ema->mp, fp); |
42e9a92f RL |
2463 | break; |
2464 | default: | |
3a3b42bf RL |
2465 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
2466 | fr_eof(fp)); | |
42e9a92f | 2467 | fc_frame_free(fp); |
42e9a92f RL |
2468 | } |
2469 | } | |
2470 | EXPORT_SYMBOL(fc_exch_recv); | |
2471 | ||
3a3b42bf RL |
2472 | /** |
2473 | * fc_exch_init() - Initialize the exchange layer for a local port | |
2474 | * @lport: The local port to initialize the exchange layer for | |
2475 | */ | |
2476 | int fc_exch_init(struct fc_lport *lport) | |
42e9a92f | 2477 | { |
3a3b42bf RL |
2478 | if (!lport->tt.seq_start_next) |
2479 | lport->tt.seq_start_next = fc_seq_start_next; | |
42e9a92f | 2480 | |
1a5c2d7e JE |
2481 | if (!lport->tt.seq_set_resp) |
2482 | lport->tt.seq_set_resp = fc_seq_set_resp; | |
2483 | ||
3a3b42bf RL |
2484 | if (!lport->tt.exch_seq_send) |
2485 | lport->tt.exch_seq_send = fc_exch_seq_send; | |
42e9a92f | 2486 | |
3a3b42bf RL |
2487 | if (!lport->tt.seq_send) |
2488 | lport->tt.seq_send = fc_seq_send; | |
42e9a92f | 2489 | |
3a3b42bf RL |
2490 | if (!lport->tt.seq_els_rsp_send) |
2491 | lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
42e9a92f | 2492 | |
3a3b42bf RL |
2493 | if (!lport->tt.exch_done) |
2494 | lport->tt.exch_done = fc_exch_done; | |
42e9a92f | 2495 | |
3a3b42bf RL |
2496 | if (!lport->tt.exch_mgr_reset) |
2497 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
42e9a92f | 2498 | |
3a3b42bf RL |
2499 | if (!lport->tt.seq_exch_abort) |
2500 | lport->tt.seq_exch_abort = fc_seq_exch_abort; | |
42e9a92f | 2501 | |
239e8104 JE |
2502 | if (!lport->tt.seq_assign) |
2503 | lport->tt.seq_assign = fc_seq_assign; | |
2504 | ||
62bdb645 JE |
2505 | if (!lport->tt.seq_release) |
2506 | lport->tt.seq_release = fc_seq_release; | |
2507 | ||
89f19a59 VD |
2508 | return 0; |
2509 | } | |
2510 | EXPORT_SYMBOL(fc_exch_init); | |
2511 | ||
2512 | /** | |
2513 | * fc_setup_exch_mgr() - Setup an exchange manager | |
2514 | */ | |
55204909 | 2515 | int fc_setup_exch_mgr(void) |
89f19a59 VD |
2516 | { |
2517 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2518 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2519 | if (!fc_em_cachep) | |
2520 | return -ENOMEM; | |
2521 | ||
e4bc50be VD |
2522 | /* |
2523 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2524 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2525 | * to order of 2's * power and order is stored | |
2526 | * in fc_cpu_order as this is later required in | |
2527 | * mapping between an exch id and exch array index | |
2528 | * in per cpu exch pool. | |
2529 | * | |
2530 | * This round up is required to align fc_cpu_mask | |
2531 | * to exchange id's lower bits such that all incoming | |
2532 | * frames of an exchange gets delivered to the same | |
2533 | * cpu on which exchange originated by simple bitwise | |
2534 | * AND operation between fc_cpu_mask and exchange id. | |
2535 | */ | |
2536 | fc_cpu_mask = 1; | |
2537 | fc_cpu_order = 0; | |
2538 | while (fc_cpu_mask < nr_cpu_ids) { | |
2539 | fc_cpu_mask <<= 1; | |
2540 | fc_cpu_order++; | |
2541 | } | |
2542 | fc_cpu_mask--; | |
2543 | ||
4ae1e19f VD |
2544 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
2545 | if (!fc_exch_workqueue) | |
6f06e3a7 | 2546 | goto err; |
42e9a92f | 2547 | return 0; |
6f06e3a7 HD |
2548 | err: |
2549 | kmem_cache_destroy(fc_em_cachep); | |
2550 | return -ENOMEM; | |
42e9a92f | 2551 | } |
42e9a92f | 2552 | |
3a3b42bf RL |
2553 | /** |
2554 | * fc_destroy_exch_mgr() - Destroy an exchange manager | |
2555 | */ | |
55204909 | 2556 | void fc_destroy_exch_mgr(void) |
42e9a92f | 2557 | { |
4ae1e19f | 2558 | destroy_workqueue(fc_exch_workqueue); |
42e9a92f RL |
2559 | kmem_cache_destroy(fc_em_cachep); |
2560 | } |