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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> |
a84ea8c7 | 30 | #include <linux/log2.h> |
42e9a92f RL |
31 | |
32 | #include <scsi/fc/fc_fc2.h> | |
33 | ||
34 | #include <scsi/libfc.h> | |
35 | #include <scsi/fc_encode.h> | |
36 | ||
8866a5d9 RL |
37 | #include "fc_libfc.h" |
38 | ||
e4bc50be VD |
39 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
40 | EXPORT_SYMBOL(fc_cpu_mask); | |
41 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ | |
3a3b42bf | 42 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
55204909 | 43 | static struct workqueue_struct *fc_exch_workqueue; |
42e9a92f RL |
44 | |
45 | /* | |
46 | * Structure and function definitions for managing Fibre Channel Exchanges | |
47 | * and Sequences. | |
48 | * | |
49 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
50 | * | |
51 | * fc_exch_mgr holds the exchange state for an N port | |
52 | * | |
53 | * fc_exch holds state for one exchange and links to its active sequence. | |
54 | * | |
55 | * fc_seq holds the state for an individual sequence. | |
56 | */ | |
57 | ||
3a3b42bf RL |
58 | /** |
59 | * struct fc_exch_pool - Per cpu exchange pool | |
60 | * @next_index: Next possible free exchange index | |
61 | * @total_exches: Total allocated exchanges | |
62 | * @lock: Exch pool lock | |
63 | * @ex_list: List of exchanges | |
e4bc50be VD |
64 | * |
65 | * This structure manages per cpu exchanges in array of exchange pointers. | |
66 | * This array is allocated followed by struct fc_exch_pool memory for | |
67 | * assigned range of exchanges to per cpu pool. | |
68 | */ | |
69 | struct fc_exch_pool { | |
e17b4af7 VD |
70 | spinlock_t lock; |
71 | struct list_head ex_list; | |
3a3b42bf RL |
72 | u16 next_index; |
73 | u16 total_exches; | |
2034c19c HD |
74 | |
75 | /* two cache of free slot in exch array */ | |
76 | u16 left; | |
77 | u16 right; | |
e17b4af7 | 78 | } ____cacheline_aligned_in_smp; |
e4bc50be | 79 | |
3a3b42bf RL |
80 | /** |
81 | * struct fc_exch_mgr - The Exchange Manager (EM). | |
82 | * @class: Default class for new sequences | |
83 | * @kref: Reference counter | |
84 | * @min_xid: Minimum exchange ID | |
85 | * @max_xid: Maximum exchange ID | |
86 | * @ep_pool: Reserved exchange pointers | |
87 | * @pool_max_index: Max exch array index in exch pool | |
88 | * @pool: Per cpu exch pool | |
89 | * @stats: Statistics structure | |
42e9a92f RL |
90 | * |
91 | * This structure is the center for creating exchanges and sequences. | |
92 | * It manages the allocation of exchange IDs. | |
93 | */ | |
94 | struct fc_exch_mgr { | |
c6b21c93 | 95 | struct fc_exch_pool __percpu *pool; |
e17b4af7 | 96 | mempool_t *ep_pool; |
3a3b42bf RL |
97 | enum fc_class class; |
98 | struct kref kref; | |
99 | u16 min_xid; | |
100 | u16 max_xid; | |
3a3b42bf | 101 | u16 pool_max_index; |
42e9a92f | 102 | |
42e9a92f RL |
103 | struct { |
104 | atomic_t no_free_exch; | |
105 | atomic_t no_free_exch_xid; | |
106 | atomic_t xid_not_found; | |
107 | atomic_t xid_busy; | |
108 | atomic_t seq_not_found; | |
109 | atomic_t non_bls_resp; | |
110 | } stats; | |
42e9a92f | 111 | }; |
42e9a92f | 112 | |
3a3b42bf RL |
113 | /** |
114 | * struct fc_exch_mgr_anchor - primary structure for list of EMs | |
115 | * @ema_list: Exchange Manager Anchor list | |
116 | * @mp: Exchange Manager associated with this anchor | |
117 | * @match: Routine to determine if this anchor's EM should be used | |
118 | * | |
119 | * When walking the list of anchors the match routine will be called | |
120 | * for each anchor to determine if that EM should be used. The last | |
121 | * anchor in the list will always match to handle any exchanges not | |
122 | * handled by other EMs. The non-default EMs would be added to the | |
1bd49b48 | 123 | * anchor list by HW that provides offloads. |
3a3b42bf | 124 | */ |
96316099 VD |
125 | struct fc_exch_mgr_anchor { |
126 | struct list_head ema_list; | |
127 | struct fc_exch_mgr *mp; | |
128 | bool (*match)(struct fc_frame *); | |
129 | }; | |
130 | ||
42e9a92f | 131 | static void fc_exch_rrq(struct fc_exch *); |
92261156 JE |
132 | static void fc_seq_ls_acc(struct fc_frame *); |
133 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, | |
42e9a92f | 134 | enum fc_els_rjt_explan); |
92261156 JE |
135 | static void fc_exch_els_rec(struct fc_frame *); |
136 | static void fc_exch_els_rrq(struct fc_frame *); | |
42e9a92f RL |
137 | |
138 | /* | |
139 | * Internal implementation notes. | |
140 | * | |
141 | * The exchange manager is one by default in libfc but LLD may choose | |
142 | * to have one per CPU. The sequence manager is one per exchange manager | |
143 | * and currently never separated. | |
144 | * | |
145 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
146 | * assigned by the Sequence Initiator that shall be unique for a specific | |
147 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
148 | * qualified by exchange ID, which one might think it would be. | |
149 | * In practice this limits the number of open sequences and exchanges to 256 | |
150 | * per session. For most targets we could treat this limit as per exchange. | |
151 | * | |
152 | * The exchange and its sequence are freed when the last sequence is received. | |
153 | * It's possible for the remote port to leave an exchange open without | |
154 | * sending any sequences. | |
155 | * | |
156 | * Notes on reference counts: | |
157 | * | |
158 | * Exchanges are reference counted and exchange gets freed when the reference | |
159 | * count becomes zero. | |
160 | * | |
161 | * Timeouts: | |
162 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
163 | * | |
164 | * Sequence event handling: | |
165 | * | |
166 | * The following events may occur on initiator sequences: | |
167 | * | |
168 | * Send. | |
169 | * For now, the whole thing is sent. | |
170 | * Receive ACK | |
171 | * This applies only to class F. | |
172 | * The sequence is marked complete. | |
173 | * ULP completion. | |
174 | * The upper layer calls fc_exch_done() when done | |
175 | * with exchange and sequence tuple. | |
176 | * RX-inferred completion. | |
177 | * When we receive the next sequence on the same exchange, we can | |
178 | * retire the previous sequence ID. (XXX not implemented). | |
179 | * Timeout. | |
180 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
181 | * E_D_TOV causes abort and calls upper layer response handler | |
182 | * with FC_EX_TIMEOUT error. | |
183 | * Receive RJT | |
184 | * XXX defer. | |
185 | * Send ABTS | |
186 | * On timeout. | |
187 | * | |
188 | * The following events may occur on recipient sequences: | |
189 | * | |
190 | * Receive | |
191 | * Allocate sequence for first frame received. | |
192 | * Hold during receive handler. | |
193 | * Release when final frame received. | |
194 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
195 | * Receive ABTS | |
196 | * Deallocate sequence | |
197 | * Send RJT | |
198 | * Deallocate | |
199 | * | |
200 | * For now, we neglect conditions where only part of a sequence was | |
201 | * received or transmitted, or where out-of-order receipt is detected. | |
202 | */ | |
203 | ||
204 | /* | |
205 | * Locking notes: | |
206 | * | |
207 | * The EM code run in a per-CPU worker thread. | |
208 | * | |
209 | * To protect against concurrency between a worker thread code and timers, | |
210 | * sequence allocation and deallocation must be locked. | |
211 | * - exchange refcnt can be done atomicly without locks. | |
212 | * - sequence allocation must be locked by exch lock. | |
b2f0091f VD |
213 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
214 | * EM pool lock must be taken before the ex_lock. | |
42e9a92f RL |
215 | */ |
216 | ||
217 | /* | |
218 | * opcode names for debugging. | |
219 | */ | |
220 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
221 | ||
3a3b42bf RL |
222 | /** |
223 | * fc_exch_name_lookup() - Lookup name by opcode | |
224 | * @op: Opcode to be looked up | |
225 | * @table: Opcode/name table | |
226 | * @max_index: Index not to be exceeded | |
227 | * | |
228 | * This routine is used to determine a human-readable string identifying | |
229 | * a R_CTL opcode. | |
230 | */ | |
42e9a92f RL |
231 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
232 | unsigned int max_index) | |
233 | { | |
234 | const char *name = NULL; | |
235 | ||
236 | if (op < max_index) | |
237 | name = table[op]; | |
238 | if (!name) | |
239 | name = "unknown"; | |
240 | return name; | |
241 | } | |
242 | ||
3a3b42bf RL |
243 | /** |
244 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() | |
245 | * @op: The opcode to be looked up | |
246 | */ | |
42e9a92f RL |
247 | static const char *fc_exch_rctl_name(unsigned int op) |
248 | { | |
249 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
7156fffa | 250 | ARRAY_SIZE(fc_exch_rctl_names)); |
42e9a92f RL |
251 | } |
252 | ||
3a3b42bf RL |
253 | /** |
254 | * fc_exch_hold() - Increment an exchange's reference count | |
255 | * @ep: Echange to be held | |
42e9a92f | 256 | */ |
3a3b42bf | 257 | static inline void fc_exch_hold(struct fc_exch *ep) |
42e9a92f RL |
258 | { |
259 | atomic_inc(&ep->ex_refcnt); | |
260 | } | |
261 | ||
3a3b42bf RL |
262 | /** |
263 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields | |
264 | * and determine SOF and EOF. | |
265 | * @ep: The exchange to that will use the header | |
266 | * @fp: The frame whose header is to be modified | |
267 | * @f_ctl: F_CTL bits that will be used for the frame header | |
268 | * | |
269 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, | |
270 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. | |
42e9a92f RL |
271 | */ |
272 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
273 | u32 f_ctl) | |
274 | { | |
275 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
276 | u16 fill; | |
277 | ||
278 | fr_sof(fp) = ep->class; | |
279 | if (ep->seq.cnt) | |
280 | fr_sof(fp) = fc_sof_normal(ep->class); | |
281 | ||
282 | if (f_ctl & FC_FC_END_SEQ) { | |
283 | fr_eof(fp) = FC_EOF_T; | |
284 | if (fc_sof_needs_ack(ep->class)) | |
285 | fr_eof(fp) = FC_EOF_N; | |
286 | /* | |
3a3b42bf | 287 | * From F_CTL. |
42e9a92f RL |
288 | * The number of fill bytes to make the length a 4-byte |
289 | * multiple is the low order 2-bits of the f_ctl. | |
290 | * The fill itself will have been cleared by the frame | |
291 | * allocation. | |
292 | * After this, the length will be even, as expected by | |
293 | * the transport. | |
294 | */ | |
295 | fill = fr_len(fp) & 3; | |
296 | if (fill) { | |
297 | fill = 4 - fill; | |
298 | /* TODO, this may be a problem with fragmented skb */ | |
299 | skb_put(fp_skb(fp), fill); | |
300 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
301 | } | |
302 | } else { | |
303 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
304 | fr_eof(fp) = FC_EOF_N; | |
305 | } | |
306 | ||
c1d45424 | 307 | /* Initialize remaining fh fields from fc_fill_fc_hdr */ |
42e9a92f RL |
308 | fh->fh_ox_id = htons(ep->oxid); |
309 | fh->fh_rx_id = htons(ep->rxid); | |
310 | fh->fh_seq_id = ep->seq.id; | |
311 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
312 | } | |
313 | ||
3a3b42bf RL |
314 | /** |
315 | * fc_exch_release() - Decrement an exchange's reference count | |
316 | * @ep: Exchange to be released | |
317 | * | |
318 | * If the reference count reaches zero and the exchange is complete, | |
319 | * it is freed. | |
42e9a92f RL |
320 | */ |
321 | static void fc_exch_release(struct fc_exch *ep) | |
322 | { | |
323 | struct fc_exch_mgr *mp; | |
324 | ||
325 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
326 | mp = ep->em; | |
327 | if (ep->destructor) | |
328 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 329 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
330 | mempool_free(ep, mp->ep_pool); |
331 | } | |
332 | } | |
333 | ||
b29a4f30 VD |
334 | /** |
335 | * fc_exch_timer_cancel() - cancel exch timer | |
336 | * @ep: The exchange whose timer to be canceled | |
337 | */ | |
4a80f083 | 338 | static inline void fc_exch_timer_cancel(struct fc_exch *ep) |
b29a4f30 VD |
339 | { |
340 | if (cancel_delayed_work(&ep->timeout_work)) { | |
341 | FC_EXCH_DBG(ep, "Exchange timer canceled\n"); | |
342 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
343 | } | |
344 | } | |
345 | ||
346 | /** | |
347 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the | |
348 | * the exchange lock held | |
349 | * @ep: The exchange whose timer will start | |
350 | * @timer_msec: The timeout period | |
351 | * | |
352 | * Used for upper level protocols to time out the exchange. | |
353 | * The timer is cancelled when it fires or when the exchange completes. | |
354 | */ | |
355 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
356 | unsigned int timer_msec) | |
357 | { | |
358 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
359 | return; | |
360 | ||
361 | FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec); | |
362 | ||
b8678865 BVA |
363 | fc_exch_hold(ep); /* hold for timer */ |
364 | if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, | |
365 | msecs_to_jiffies(timer_msec))) | |
366 | fc_exch_release(ep); | |
b29a4f30 VD |
367 | } |
368 | ||
369 | /** | |
370 | * fc_exch_timer_set() - Lock the exchange and set the timer | |
371 | * @ep: The exchange whose timer will start | |
372 | * @timer_msec: The timeout period | |
373 | */ | |
374 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
375 | { | |
376 | spin_lock_bh(&ep->ex_lock); | |
377 | fc_exch_timer_set_locked(ep, timer_msec); | |
378 | spin_unlock_bh(&ep->ex_lock); | |
379 | } | |
380 | ||
3a3b42bf RL |
381 | /** |
382 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held | |
383 | * @ep: The exchange that is complete | |
7030fd62 BVA |
384 | * |
385 | * Note: May sleep if invoked from outside a response handler. | |
3a3b42bf | 386 | */ |
42e9a92f RL |
387 | static int fc_exch_done_locked(struct fc_exch *ep) |
388 | { | |
389 | int rc = 1; | |
390 | ||
391 | /* | |
392 | * We must check for completion in case there are two threads | |
393 | * tyring to complete this. But the rrq code will reuse the | |
394 | * ep, and in that case we only clear the resp and set it as | |
395 | * complete, so it can be reused by the timer to send the rrq. | |
396 | */ | |
42e9a92f RL |
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, |
cae7b6dd | 467 | struct fc_frame *fp) |
1a7b75ae RL |
468 | { |
469 | struct fc_exch *ep; | |
470 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
cae7b6dd | 471 | int error = -ENXIO; |
3a3b42bf | 472 | u32 f_ctl; |
14fc315f | 473 | u8 fh_type = fh->fh_type; |
1a7b75ae RL |
474 | |
475 | ep = fc_seq_exch(sp); | |
cae7b6dd BVA |
476 | |
477 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) { | |
478 | fc_frame_free(fp); | |
479 | goto out; | |
480 | } | |
481 | ||
fb00cc23 | 482 | WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT)); |
1a7b75ae RL |
483 | |
484 | f_ctl = ntoh24(fh->fh_f_ctl); | |
485 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
f60e12e9 | 486 | fr_encaps(fp) = ep->encaps; |
1a7b75ae RL |
487 | |
488 | /* | |
489 | * update sequence count if this frame is carrying | |
490 | * multiple FC frames when sequence offload is enabled | |
491 | * by LLD. | |
492 | */ | |
493 | if (fr_max_payload(fp)) | |
494 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
495 | fr_max_payload(fp)); | |
496 | else | |
497 | sp->cnt++; | |
498 | ||
499 | /* | |
500 | * Send the frame. | |
501 | */ | |
3a3b42bf | 502 | error = lport->tt.frame_send(lport, fp); |
1a7b75ae | 503 | |
14fc315f | 504 | if (fh_type == FC_TYPE_BLS) |
fb00cc23 | 505 | goto out; |
77a2b73a | 506 | |
1a7b75ae RL |
507 | /* |
508 | * Update the exchange and sequence flags, | |
509 | * assuming all frames for the sequence have been sent. | |
510 | * We can only be called to send once for each sequence. | |
511 | */ | |
1a7b75ae | 512 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ |
cc3593d3 | 513 | if (f_ctl & FC_FC_SEQ_INIT) |
1a7b75ae | 514 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
fb00cc23 NH |
515 | out: |
516 | return error; | |
517 | } | |
518 | ||
519 | /** | |
520 | * fc_seq_send() - Send a frame using existing sequence/exchange pair | |
521 | * @lport: The local port that the exchange will be sent on | |
522 | * @sp: The sequence to be sent | |
523 | * @fp: The frame to be sent on the exchange | |
cae7b6dd BVA |
524 | * |
525 | * Note: The frame will be freed either by a direct call to fc_frame_free(fp) | |
526 | * or indirectly by calling libfc_function_template.frame_send(). | |
fb00cc23 NH |
527 | */ |
528 | static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, | |
529 | struct fc_frame *fp) | |
530 | { | |
531 | struct fc_exch *ep; | |
532 | int error; | |
533 | ep = fc_seq_exch(sp); | |
534 | spin_lock_bh(&ep->ex_lock); | |
535 | error = fc_seq_send_locked(lport, sp, fp); | |
1a7b75ae RL |
536 | spin_unlock_bh(&ep->ex_lock); |
537 | return error; | |
538 | } | |
539 | ||
540 | /** | |
3a3b42bf RL |
541 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
542 | * @ep: The exchange to allocate a new sequence for | |
543 | * @seq_id: The sequence ID to be used | |
1a7b75ae RL |
544 | * |
545 | * We don't support multiple originated sequences on the same exchange. | |
546 | * By implication, any previously originated sequence on this exchange | |
547 | * is complete, and we reallocate the same sequence. | |
548 | */ | |
549 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
550 | { | |
551 | struct fc_seq *sp; | |
552 | ||
553 | sp = &ep->seq; | |
554 | sp->ssb_stat = 0; | |
555 | sp->cnt = 0; | |
556 | sp->id = seq_id; | |
557 | return sp; | |
558 | } | |
559 | ||
3a3b42bf RL |
560 | /** |
561 | * fc_seq_start_next_locked() - Allocate a new sequence on the same | |
562 | * exchange as the supplied sequence | |
563 | * @sp: The sequence/exchange to get a new sequence for | |
564 | */ | |
1a7b75ae RL |
565 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
566 | { | |
567 | struct fc_exch *ep = fc_seq_exch(sp); | |
568 | ||
569 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
570 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", | |
571 | ep->f_ctl, sp->id); | |
572 | return sp; | |
573 | } | |
574 | ||
575 | /** | |
3a3b42bf RL |
576 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
577 | * for a given sequence/exchange pair | |
578 | * @sp: The sequence/exchange to get a new exchange for | |
1a7b75ae RL |
579 | */ |
580 | static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) | |
581 | { | |
582 | struct fc_exch *ep = fc_seq_exch(sp); | |
583 | ||
584 | spin_lock_bh(&ep->ex_lock); | |
585 | sp = fc_seq_start_next_locked(sp); | |
586 | spin_unlock_bh(&ep->ex_lock); | |
587 | ||
588 | return sp; | |
589 | } | |
590 | ||
1a5c2d7e JE |
591 | /* |
592 | * Set the response handler for the exchange associated with a sequence. | |
7030fd62 BVA |
593 | * |
594 | * Note: May sleep if invoked from outside a response handler. | |
1a5c2d7e JE |
595 | */ |
596 | static void fc_seq_set_resp(struct fc_seq *sp, | |
597 | void (*resp)(struct fc_seq *, struct fc_frame *, | |
598 | void *), | |
599 | void *arg) | |
600 | { | |
601 | struct fc_exch *ep = fc_seq_exch(sp); | |
7030fd62 | 602 | DEFINE_WAIT(wait); |
1a5c2d7e JE |
603 | |
604 | spin_lock_bh(&ep->ex_lock); | |
7030fd62 BVA |
605 | while (ep->resp_active && ep->resp_task != current) { |
606 | prepare_to_wait(&ep->resp_wq, &wait, TASK_UNINTERRUPTIBLE); | |
607 | spin_unlock_bh(&ep->ex_lock); | |
608 | ||
609 | schedule(); | |
610 | ||
611 | spin_lock_bh(&ep->ex_lock); | |
612 | } | |
613 | finish_wait(&ep->resp_wq, &wait); | |
1a5c2d7e JE |
614 | ep->resp = resp; |
615 | ep->arg = arg; | |
616 | spin_unlock_bh(&ep->ex_lock); | |
617 | } | |
618 | ||
1a7b75ae | 619 | /** |
77a2b73a VD |
620 | * fc_exch_abort_locked() - Abort an exchange |
621 | * @ep: The exchange to be aborted | |
3a3b42bf RL |
622 | * @timer_msec: The period of time to wait before aborting |
623 | * | |
77a2b73a VD |
624 | * Locking notes: Called with exch lock held |
625 | * | |
626 | * Return value: 0 on success else error code | |
1a7b75ae | 627 | */ |
77a2b73a VD |
628 | static int fc_exch_abort_locked(struct fc_exch *ep, |
629 | unsigned int timer_msec) | |
42e9a92f RL |
630 | { |
631 | struct fc_seq *sp; | |
42e9a92f RL |
632 | struct fc_frame *fp; |
633 | int error; | |
634 | ||
42e9a92f | 635 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || |
77a2b73a | 636 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) |
42e9a92f | 637 | return -ENXIO; |
42e9a92f RL |
638 | |
639 | /* | |
640 | * Send the abort on a new sequence if possible. | |
641 | */ | |
642 | sp = fc_seq_start_next_locked(&ep->seq); | |
77a2b73a | 643 | if (!sp) |
42e9a92f | 644 | return -ENOMEM; |
42e9a92f | 645 | |
42e9a92f RL |
646 | if (timer_msec) |
647 | fc_exch_timer_set_locked(ep, timer_msec); | |
42e9a92f | 648 | |
cae7b6dd BVA |
649 | if (ep->sid) { |
650 | /* | |
651 | * Send an abort for the sequence that timed out. | |
652 | */ | |
653 | fp = fc_frame_alloc(ep->lp, 0); | |
654 | if (fp) { | |
655 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
656 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
657 | FC_TYPE_BLS, FC_FC_END_SEQ | | |
658 | FC_FC_SEQ_INIT, 0); | |
659 | error = fc_seq_send_locked(ep->lp, sp, fp); | |
660 | } else { | |
661 | error = -ENOBUFS; | |
662 | } | |
663 | } else { | |
664 | /* | |
665 | * If not logged into the fabric, don't send ABTS but leave | |
666 | * sequence active until next timeout. | |
667 | */ | |
668 | error = 0; | |
669 | } | |
670 | ep->esb_stat |= ESB_ST_ABNORMAL; | |
42e9a92f RL |
671 | return error; |
672 | } | |
42e9a92f | 673 | |
77a2b73a VD |
674 | /** |
675 | * fc_seq_exch_abort() - Abort an exchange and sequence | |
676 | * @req_sp: The sequence to be aborted | |
677 | * @timer_msec: The period of time to wait before aborting | |
678 | * | |
679 | * Generally called because of a timeout or an abort from the upper layer. | |
680 | * | |
681 | * Return value: 0 on success else error code | |
682 | */ | |
683 | static int fc_seq_exch_abort(const struct fc_seq *req_sp, | |
684 | unsigned int timer_msec) | |
685 | { | |
686 | struct fc_exch *ep; | |
687 | int error; | |
688 | ||
689 | ep = fc_seq_exch(req_sp); | |
690 | spin_lock_bh(&ep->ex_lock); | |
691 | error = fc_exch_abort_locked(ep, timer_msec); | |
692 | spin_unlock_bh(&ep->ex_lock); | |
693 | return error; | |
694 | } | |
695 | ||
7030fd62 BVA |
696 | /** |
697 | * fc_invoke_resp() - invoke ep->resp() | |
698 | * | |
699 | * Notes: | |
700 | * It is assumed that after initialization finished (this means the | |
701 | * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are | |
702 | * modified only via fc_seq_set_resp(). This guarantees that none of these | |
703 | * two variables changes if ep->resp_active > 0. | |
704 | * | |
705 | * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when | |
706 | * this function is invoked, the first spin_lock_bh() call in this function | |
707 | * will wait until fc_seq_set_resp() has finished modifying these variables. | |
708 | * | |
709 | * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that | |
710 | * ep->resp() won't be invoked after fc_exch_done() has returned. | |
711 | * | |
712 | * The response handler itself may invoke fc_exch_done(), which will clear the | |
713 | * ep->resp pointer. | |
714 | * | |
715 | * Return value: | |
716 | * Returns true if and only if ep->resp has been invoked. | |
717 | */ | |
718 | static bool fc_invoke_resp(struct fc_exch *ep, struct fc_seq *sp, | |
719 | struct fc_frame *fp) | |
720 | { | |
721 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
722 | void *arg; | |
723 | bool res = false; | |
724 | ||
725 | spin_lock_bh(&ep->ex_lock); | |
726 | ep->resp_active++; | |
727 | if (ep->resp_task != current) | |
728 | ep->resp_task = !ep->resp_task ? current : NULL; | |
729 | resp = ep->resp; | |
730 | arg = ep->arg; | |
731 | spin_unlock_bh(&ep->ex_lock); | |
732 | ||
733 | if (resp) { | |
734 | resp(sp, fp, arg); | |
735 | res = true; | |
736 | } else if (!IS_ERR(fp)) { | |
737 | fc_frame_free(fp); | |
738 | } | |
739 | ||
740 | spin_lock_bh(&ep->ex_lock); | |
741 | if (--ep->resp_active == 0) | |
742 | ep->resp_task = NULL; | |
743 | spin_unlock_bh(&ep->ex_lock); | |
744 | ||
745 | if (ep->resp_active == 0) | |
746 | wake_up(&ep->resp_wq); | |
747 | ||
748 | return res; | |
749 | } | |
750 | ||
3a3b42bf RL |
751 | /** |
752 | * fc_exch_timeout() - Handle exchange timer expiration | |
753 | * @work: The work_struct identifying the exchange that timed out | |
42e9a92f RL |
754 | */ |
755 | static void fc_exch_timeout(struct work_struct *work) | |
756 | { | |
757 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
758 | timeout_work.work); | |
759 | struct fc_seq *sp = &ep->seq; | |
42e9a92f RL |
760 | u32 e_stat; |
761 | int rc = 1; | |
762 | ||
cd305ce4 RL |
763 | FC_EXCH_DBG(ep, "Exchange timed out\n"); |
764 | ||
42e9a92f RL |
765 | spin_lock_bh(&ep->ex_lock); |
766 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
767 | goto unlock; | |
768 | ||
769 | e_stat = ep->esb_stat; | |
770 | if (e_stat & ESB_ST_COMPLETE) { | |
771 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 772 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
773 | if (e_stat & ESB_ST_REC_QUAL) |
774 | fc_exch_rrq(ep); | |
42e9a92f RL |
775 | goto done; |
776 | } else { | |
42e9a92f RL |
777 | if (e_stat & ESB_ST_ABNORMAL) |
778 | rc = fc_exch_done_locked(ep); | |
779 | spin_unlock_bh(&ep->ex_lock); | |
f3162483 PN |
780 | if (!rc) |
781 | fc_exch_delete(ep); | |
7030fd62 BVA |
782 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_TIMEOUT)); |
783 | fc_seq_set_resp(sp, NULL, ep->arg); | |
42e9a92f RL |
784 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); |
785 | goto done; | |
786 | } | |
787 | unlock: | |
788 | spin_unlock_bh(&ep->ex_lock); | |
789 | done: | |
790 | /* | |
791 | * This release matches the hold taken when the timer was set. | |
792 | */ | |
793 | fc_exch_release(ep); | |
794 | } | |
795 | ||
52ff878c | 796 | /** |
3a3b42bf RL |
797 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
798 | * @lport: The local port that the exchange is for | |
799 | * @mp: The exchange manager that will allocate the exchange | |
42e9a92f | 800 | * |
d7179680 | 801 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 802 | */ |
52ff878c | 803 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 804 | struct fc_exch_mgr *mp) |
42e9a92f RL |
805 | { |
806 | struct fc_exch *ep; | |
b2f0091f VD |
807 | unsigned int cpu; |
808 | u16 index; | |
809 | struct fc_exch_pool *pool; | |
42e9a92f RL |
810 | |
811 | /* allocate memory for exchange */ | |
812 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
813 | if (!ep) { | |
814 | atomic_inc(&mp->stats.no_free_exch); | |
815 | goto out; | |
816 | } | |
817 | memset(ep, 0, sizeof(*ep)); | |
818 | ||
f018b73a | 819 | cpu = get_cpu(); |
b2f0091f VD |
820 | pool = per_cpu_ptr(mp->pool, cpu); |
821 | spin_lock_bh(&pool->lock); | |
f018b73a | 822 | put_cpu(); |
2034c19c HD |
823 | |
824 | /* peek cache of free slot */ | |
825 | if (pool->left != FC_XID_UNKNOWN) { | |
826 | index = pool->left; | |
827 | pool->left = FC_XID_UNKNOWN; | |
828 | goto hit; | |
829 | } | |
830 | if (pool->right != FC_XID_UNKNOWN) { | |
831 | index = pool->right; | |
832 | pool->right = FC_XID_UNKNOWN; | |
833 | goto hit; | |
834 | } | |
835 | ||
b2f0091f VD |
836 | index = pool->next_index; |
837 | /* allocate new exch from pool */ | |
838 | while (fc_exch_ptr_get(pool, index)) { | |
839 | index = index == mp->pool_max_index ? 0 : index + 1; | |
840 | if (index == pool->next_index) | |
42e9a92f | 841 | goto err; |
42e9a92f | 842 | } |
b2f0091f | 843 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
2034c19c | 844 | hit: |
42e9a92f RL |
845 | fc_exch_hold(ep); /* hold for exch in mp */ |
846 | spin_lock_init(&ep->ex_lock); | |
847 | /* | |
848 | * Hold exch lock for caller to prevent fc_exch_reset() | |
849 | * from releasing exch while fc_exch_alloc() caller is | |
850 | * still working on exch. | |
851 | */ | |
852 | spin_lock_bh(&ep->ex_lock); | |
853 | ||
b2f0091f VD |
854 | fc_exch_ptr_set(pool, index, ep); |
855 | list_add_tail(&ep->ex_list, &pool->ex_list); | |
42e9a92f | 856 | fc_seq_alloc(ep, ep->seq_id++); |
b2f0091f VD |
857 | pool->total_exches++; |
858 | spin_unlock_bh(&pool->lock); | |
42e9a92f RL |
859 | |
860 | /* | |
861 | * update exchange | |
862 | */ | |
b2f0091f | 863 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
42e9a92f | 864 | ep->em = mp; |
b2f0091f | 865 | ep->pool = pool; |
52ff878c | 866 | ep->lp = lport; |
42e9a92f RL |
867 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
868 | ep->rxid = FC_XID_UNKNOWN; | |
869 | ep->class = mp->class; | |
7030fd62 BVA |
870 | ep->resp_active = 0; |
871 | init_waitqueue_head(&ep->resp_wq); | |
42e9a92f RL |
872 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); |
873 | out: | |
874 | return ep; | |
875 | err: | |
b2f0091f | 876 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
877 | atomic_inc(&mp->stats.no_free_exch_xid); |
878 | mempool_free(ep, mp->ep_pool); | |
879 | return NULL; | |
880 | } | |
52ff878c VD |
881 | |
882 | /** | |
3a3b42bf RL |
883 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
884 | * local port's list of EMs. | |
885 | * @lport: The local port that will own the exchange | |
886 | * @fp: The FC frame that the exchange will be for | |
52ff878c | 887 | * |
3a3b42bf RL |
888 | * This function walks the list of exchange manager(EM) |
889 | * anchors to select an EM for a new exchange allocation. The | |
890 | * EM is selected when a NULL match function pointer is encountered | |
891 | * or when a call to a match function returns true. | |
52ff878c | 892 | */ |
3e22760d VD |
893 | static inline struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
894 | struct fc_frame *fp) | |
52ff878c VD |
895 | { |
896 | struct fc_exch_mgr_anchor *ema; | |
52ff878c | 897 | |
3e22760d VD |
898 | list_for_each_entry(ema, &lport->ema_list, ema_list) |
899 | if (!ema->match || ema->match(fp)) | |
900 | return fc_exch_em_alloc(lport, ema->mp); | |
52ff878c VD |
901 | return NULL; |
902 | } | |
42e9a92f | 903 | |
3a3b42bf RL |
904 | /** |
905 | * fc_exch_find() - Lookup and hold an exchange | |
906 | * @mp: The exchange manager to lookup the exchange from | |
907 | * @xid: The XID of the exchange to look up | |
42e9a92f RL |
908 | */ |
909 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
910 | { | |
b2f0091f | 911 | struct fc_exch_pool *pool; |
42e9a92f RL |
912 | struct fc_exch *ep = NULL; |
913 | ||
914 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
b2f0091f VD |
915 | pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask); |
916 | spin_lock_bh(&pool->lock); | |
917 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); | |
8d080236 BVA |
918 | if (ep) { |
919 | WARN_ON(ep->xid != xid); | |
42e9a92f | 920 | fc_exch_hold(ep); |
8d080236 | 921 | } |
b2f0091f | 922 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
923 | } |
924 | return ep; | |
925 | } | |
926 | ||
1a7b75ae RL |
927 | |
928 | /** | |
929 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and | |
3a3b42bf RL |
930 | * the memory allocated for the related objects may be freed. |
931 | * @sp: The sequence that has completed | |
7030fd62 BVA |
932 | * |
933 | * Note: May sleep if invoked from outside a response handler. | |
1a7b75ae RL |
934 | */ |
935 | static void fc_exch_done(struct fc_seq *sp) | |
42e9a92f RL |
936 | { |
937 | struct fc_exch *ep = fc_seq_exch(sp); | |
938 | int rc; | |
939 | ||
940 | spin_lock_bh(&ep->ex_lock); | |
941 | rc = fc_exch_done_locked(ep); | |
942 | spin_unlock_bh(&ep->ex_lock); | |
7030fd62 BVA |
943 | |
944 | fc_seq_set_resp(sp, NULL, ep->arg); | |
42e9a92f | 945 | if (!rc) |
b2f0091f | 946 | fc_exch_delete(ep); |
42e9a92f | 947 | } |
42e9a92f | 948 | |
3a3b42bf RL |
949 | /** |
950 | * fc_exch_resp() - Allocate a new exchange for a response frame | |
951 | * @lport: The local port that the exchange was for | |
952 | * @mp: The exchange manager to allocate the exchange from | |
953 | * @fp: The response frame | |
954 | * | |
42e9a92f RL |
955 | * Sets the responder ID in the frame header. |
956 | */ | |
52ff878c VD |
957 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
958 | struct fc_exch_mgr *mp, | |
959 | struct fc_frame *fp) | |
42e9a92f RL |
960 | { |
961 | struct fc_exch *ep; | |
962 | struct fc_frame_header *fh; | |
42e9a92f | 963 | |
52ff878c | 964 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
965 | if (ep) { |
966 | ep->class = fc_frame_class(fp); | |
967 | ||
968 | /* | |
969 | * Set EX_CTX indicating we're responding on this exchange. | |
970 | */ | |
971 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
972 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
973 | fh = fc_frame_header_get(fp); | |
974 | ep->sid = ntoh24(fh->fh_d_id); | |
975 | ep->did = ntoh24(fh->fh_s_id); | |
976 | ep->oid = ep->did; | |
977 | ||
978 | /* | |
979 | * Allocated exchange has placed the XID in the | |
980 | * originator field. Move it to the responder field, | |
981 | * and set the originator XID from the frame. | |
982 | */ | |
983 | ep->rxid = ep->xid; | |
984 | ep->oxid = ntohs(fh->fh_ox_id); | |
985 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
986 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
987 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
988 | ||
42e9a92f | 989 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 990 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
991 | } |
992 | return ep; | |
993 | } | |
994 | ||
3a3b42bf RL |
995 | /** |
996 | * fc_seq_lookup_recip() - Find a sequence where the other end | |
997 | * originated the sequence | |
998 | * @lport: The local port that the frame was sent to | |
999 | * @mp: The Exchange Manager to lookup the exchange from | |
1000 | * @fp: The frame associated with the sequence we're looking for | |
1001 | * | |
42e9a92f RL |
1002 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
1003 | * on the ep that should be released by the caller. | |
1004 | */ | |
52ff878c VD |
1005 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
1006 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 1007 | struct fc_frame *fp) |
42e9a92f RL |
1008 | { |
1009 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1010 | struct fc_exch *ep = NULL; | |
1011 | struct fc_seq *sp = NULL; | |
1012 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
1013 | u32 f_ctl; | |
1014 | u16 xid; | |
1015 | ||
1016 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1017 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
1018 | ||
1019 | /* | |
1020 | * Lookup or create the exchange if we will be creating the sequence. | |
1021 | */ | |
1022 | if (f_ctl & FC_FC_EX_CTX) { | |
1023 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
1024 | ep = fc_exch_find(mp, xid); | |
1025 | if (!ep) { | |
1026 | atomic_inc(&mp->stats.xid_not_found); | |
1027 | reject = FC_RJT_OX_ID; | |
1028 | goto out; | |
1029 | } | |
1030 | if (ep->rxid == FC_XID_UNKNOWN) | |
1031 | ep->rxid = ntohs(fh->fh_rx_id); | |
1032 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
1033 | reject = FC_RJT_OX_ID; | |
1034 | goto rel; | |
1035 | } | |
1036 | } else { | |
1037 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
1038 | ||
1039 | /* | |
1040 | * Special case for MDS issuing an ELS TEST with a | |
1041 | * bad rxid of 0. | |
1042 | * XXX take this out once we do the proper reject. | |
1043 | */ | |
1044 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
1045 | fc_frame_payload_op(fp) == ELS_TEST) { | |
1046 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
1047 | xid = FC_XID_UNKNOWN; | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * new sequence - find the exchange | |
1052 | */ | |
1053 | ep = fc_exch_find(mp, xid); | |
1054 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
1055 | if (ep) { | |
1056 | atomic_inc(&mp->stats.xid_busy); | |
1057 | reject = FC_RJT_RX_ID; | |
1058 | goto rel; | |
1059 | } | |
52ff878c | 1060 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
1061 | if (!ep) { |
1062 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
1063 | goto out; | |
1064 | } | |
1065 | xid = ep->xid; /* get our XID */ | |
1066 | } else if (!ep) { | |
1067 | atomic_inc(&mp->stats.xid_not_found); | |
1068 | reject = FC_RJT_RX_ID; /* XID not found */ | |
1069 | goto out; | |
1070 | } | |
1071 | } | |
1072 | ||
5d73bea2 | 1073 | spin_lock_bh(&ep->ex_lock); |
42e9a92f RL |
1074 | /* |
1075 | * At this point, we have the exchange held. | |
1076 | * Find or create the sequence. | |
1077 | */ | |
1078 | if (fc_sof_is_init(fr_sof(fp))) { | |
a104c844 | 1079 | sp = &ep->seq; |
42e9a92f | 1080 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 | 1081 | sp->id = fh->fh_seq_id; |
42e9a92f RL |
1082 | } else { |
1083 | sp = &ep->seq; | |
1084 | if (sp->id != fh->fh_seq_id) { | |
1085 | atomic_inc(&mp->stats.seq_not_found); | |
e3e65c69 KP |
1086 | if (f_ctl & FC_FC_END_SEQ) { |
1087 | /* | |
1088 | * Update sequence_id based on incoming last | |
1089 | * frame of sequence exchange. This is needed | |
1bd49b48 | 1090 | * for FC target where DDP has been used |
e3e65c69 KP |
1091 | * on target where, stack is indicated only |
1092 | * about last frame's (payload _header) header. | |
1093 | * Whereas "seq_id" which is part of | |
1094 | * frame_header is allocated by initiator | |
1095 | * which is totally different from "seq_id" | |
1096 | * allocated when XFER_RDY was sent by target. | |
1097 | * To avoid false -ve which results into not | |
1098 | * sending RSP, hence write request on other | |
1099 | * end never finishes. | |
1100 | */ | |
e3e65c69 KP |
1101 | sp->ssb_stat |= SSB_ST_RESP; |
1102 | sp->id = fh->fh_seq_id; | |
e3e65c69 | 1103 | } else { |
5d73bea2 BVA |
1104 | spin_unlock_bh(&ep->ex_lock); |
1105 | ||
e3e65c69 KP |
1106 | /* sequence/exch should exist */ |
1107 | reject = FC_RJT_SEQ_ID; | |
1108 | goto rel; | |
1109 | } | |
42e9a92f RL |
1110 | } |
1111 | } | |
1112 | WARN_ON(ep != fc_seq_exch(sp)); | |
1113 | ||
1114 | if (f_ctl & FC_FC_SEQ_INIT) | |
1115 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
5d73bea2 | 1116 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
1117 | |
1118 | fr_seq(fp) = sp; | |
1119 | out: | |
1120 | return reject; | |
1121 | rel: | |
1122 | fc_exch_done(&ep->seq); | |
1123 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
1124 | return reject; | |
1125 | } | |
1126 | ||
3a3b42bf RL |
1127 | /** |
1128 | * fc_seq_lookup_orig() - Find a sequence where this end | |
1129 | * originated the sequence | |
1130 | * @mp: The Exchange Manager to lookup the exchange from | |
1131 | * @fp: The frame associated with the sequence we're looking for | |
1132 | * | |
42e9a92f RL |
1133 | * Does not hold the sequence for the caller. |
1134 | */ | |
1135 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
1136 | struct fc_frame *fp) | |
1137 | { | |
1138 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1139 | struct fc_exch *ep; | |
1140 | struct fc_seq *sp = NULL; | |
1141 | u32 f_ctl; | |
1142 | u16 xid; | |
1143 | ||
1144 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1145 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
1146 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
1147 | ep = fc_exch_find(mp, xid); | |
1148 | if (!ep) | |
1149 | return NULL; | |
1150 | if (ep->seq.id == fh->fh_seq_id) { | |
1151 | /* | |
1152 | * Save the RX_ID if we didn't previously know it. | |
1153 | */ | |
1154 | sp = &ep->seq; | |
1155 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
1156 | ep->rxid == FC_XID_UNKNOWN) { | |
1157 | ep->rxid = ntohs(fh->fh_rx_id); | |
1158 | } | |
1159 | } | |
1160 | fc_exch_release(ep); | |
1161 | return sp; | |
1162 | } | |
1163 | ||
3a3b42bf RL |
1164 | /** |
1165 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange | |
1166 | * @ep: The exchange to set the addresses for | |
1167 | * @orig_id: The originator's ID | |
1168 | * @resp_id: The responder's ID | |
1169 | * | |
42e9a92f RL |
1170 | * Note this must be done before the first sequence of the exchange is sent. |
1171 | */ | |
1172 | static void fc_exch_set_addr(struct fc_exch *ep, | |
1173 | u32 orig_id, u32 resp_id) | |
1174 | { | |
1175 | ep->oid = orig_id; | |
1176 | if (ep->esb_stat & ESB_ST_RESP) { | |
1177 | ep->sid = resp_id; | |
1178 | ep->did = orig_id; | |
1179 | } else { | |
1180 | ep->sid = orig_id; | |
1181 | ep->did = resp_id; | |
1182 | } | |
1183 | } | |
1184 | ||
1a7b75ae | 1185 | /** |
25985edc | 1186 | * fc_seq_els_rsp_send() - Send an ELS response using information from |
3a3b42bf | 1187 | * the existing sequence/exchange. |
92261156 | 1188 | * @fp: The received frame |
3a3b42bf RL |
1189 | * @els_cmd: The ELS command to be sent |
1190 | * @els_data: The ELS data to be sent | |
92261156 JE |
1191 | * |
1192 | * The received frame is not freed. | |
42e9a92f | 1193 | */ |
92261156 | 1194 | static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, |
1a7b75ae | 1195 | struct fc_seq_els_data *els_data) |
42e9a92f RL |
1196 | { |
1197 | switch (els_cmd) { | |
1198 | case ELS_LS_RJT: | |
92261156 | 1199 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); |
42e9a92f RL |
1200 | break; |
1201 | case ELS_LS_ACC: | |
92261156 | 1202 | fc_seq_ls_acc(fp); |
42e9a92f RL |
1203 | break; |
1204 | case ELS_RRQ: | |
92261156 | 1205 | fc_exch_els_rrq(fp); |
42e9a92f RL |
1206 | break; |
1207 | case ELS_REC: | |
92261156 | 1208 | fc_exch_els_rec(fp); |
42e9a92f RL |
1209 | break; |
1210 | default: | |
92261156 | 1211 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
1212 | } |
1213 | } | |
42e9a92f | 1214 | |
3a3b42bf RL |
1215 | /** |
1216 | * fc_seq_send_last() - Send a sequence that is the last in the exchange | |
1217 | * @sp: The sequence that is to be sent | |
1218 | * @fp: The frame that will be sent on the sequence | |
1219 | * @rctl: The R_CTL information to be sent | |
1220 | * @fh_type: The frame header type | |
42e9a92f RL |
1221 | */ |
1222 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
1223 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
1224 | { | |
1225 | u32 f_ctl; | |
1226 | struct fc_exch *ep = fc_seq_exch(sp); | |
1227 | ||
1228 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1229 | f_ctl |= ep->f_ctl; | |
1230 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
fb00cc23 | 1231 | fc_seq_send_locked(ep->lp, sp, fp); |
42e9a92f RL |
1232 | } |
1233 | ||
3a3b42bf RL |
1234 | /** |
1235 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame | |
1236 | * @sp: The sequence to send the ACK on | |
1237 | * @rx_fp: The received frame that is being acknoledged | |
1238 | * | |
42e9a92f | 1239 | * Send ACK_1 (or equiv.) indicating we received something. |
42e9a92f RL |
1240 | */ |
1241 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
1242 | { | |
1243 | struct fc_frame *fp; | |
1244 | struct fc_frame_header *rx_fh; | |
1245 | struct fc_frame_header *fh; | |
1246 | struct fc_exch *ep = fc_seq_exch(sp); | |
3a3b42bf | 1247 | struct fc_lport *lport = ep->lp; |
42e9a92f RL |
1248 | unsigned int f_ctl; |
1249 | ||
1250 | /* | |
1251 | * Don't send ACKs for class 3. | |
1252 | */ | |
1253 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
3a3b42bf | 1254 | fp = fc_frame_alloc(lport, 0); |
42e9a92f RL |
1255 | if (!fp) |
1256 | return; | |
1257 | ||
1258 | fh = fc_frame_header_get(fp); | |
1259 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
1260 | fh->fh_type = FC_TYPE_BLS; | |
1261 | ||
1262 | /* | |
1263 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1264 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1265 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1266 | * Last ACK uses bits 7-6 (continue sequence), | |
1267 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1268 | */ | |
1269 | rx_fh = fc_frame_header_get(rx_fp); | |
1270 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1271 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1272 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
1273 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1274 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1275 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1276 | hton24(fh->fh_f_ctl, f_ctl); | |
1277 | ||
1278 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
1279 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
1280 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1281 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
1282 | ||
1283 | fr_sof(fp) = fr_sof(rx_fp); | |
1284 | if (f_ctl & FC_FC_END_SEQ) | |
1285 | fr_eof(fp) = FC_EOF_T; | |
1286 | else | |
1287 | fr_eof(fp) = FC_EOF_N; | |
1288 | ||
3a3b42bf | 1289 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1290 | } |
1291 | } | |
1292 | ||
3a3b42bf RL |
1293 | /** |
1294 | * fc_exch_send_ba_rjt() - Send BLS Reject | |
1295 | * @rx_fp: The frame being rejected | |
1296 | * @reason: The reason the frame is being rejected | |
25985edc | 1297 | * @explan: The explanation for the rejection |
3a3b42bf | 1298 | * |
42e9a92f RL |
1299 | * This is for rejecting BA_ABTS only. |
1300 | */ | |
b2ab99c9 RL |
1301 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
1302 | enum fc_ba_rjt_reason reason, | |
1303 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
1304 | { |
1305 | struct fc_frame *fp; | |
1306 | struct fc_frame_header *rx_fh; | |
1307 | struct fc_frame_header *fh; | |
1308 | struct fc_ba_rjt *rp; | |
3a3b42bf | 1309 | struct fc_lport *lport; |
42e9a92f RL |
1310 | unsigned int f_ctl; |
1311 | ||
3a3b42bf RL |
1312 | lport = fr_dev(rx_fp); |
1313 | fp = fc_frame_alloc(lport, sizeof(*rp)); | |
42e9a92f RL |
1314 | if (!fp) |
1315 | return; | |
1316 | fh = fc_frame_header_get(fp); | |
1317 | rx_fh = fc_frame_header_get(rx_fp); | |
1318 | ||
1319 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1320 | ||
1321 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1322 | rp->br_reason = reason; | |
1323 | rp->br_explan = explan; | |
1324 | ||
1325 | /* | |
1326 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1327 | */ | |
1328 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1329 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1d490ce3 JE |
1330 | fh->fh_ox_id = rx_fh->fh_ox_id; |
1331 | fh->fh_rx_id = rx_fh->fh_rx_id; | |
42e9a92f RL |
1332 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
1333 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1334 | fh->fh_type = FC_TYPE_BLS; | |
1335 | ||
1336 | /* | |
1337 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1338 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1339 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1340 | * Last ACK uses bits 7-6 (continue sequence), | |
1341 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1342 | * Always set LAST_SEQ, END_SEQ. | |
1343 | */ | |
1344 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1345 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1346 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1347 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1348 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1349 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1350 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1351 | hton24(fh->fh_f_ctl, f_ctl); | |
1352 | ||
1353 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1354 | fr_eof(fp) = FC_EOF_T; | |
1355 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1356 | fr_eof(fp) = FC_EOF_N; | |
1357 | ||
3a3b42bf | 1358 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1359 | } |
1360 | ||
3a3b42bf RL |
1361 | /** |
1362 | * fc_exch_recv_abts() - Handle an incoming ABTS | |
1363 | * @ep: The exchange the abort was on | |
1364 | * @rx_fp: The ABTS frame | |
1365 | * | |
1366 | * This would be for target mode usually, but could be due to lost | |
1367 | * FCP transfer ready, confirm or RRQ. We always handle this as an | |
1368 | * exchange abort, ignoring the parameter. | |
42e9a92f RL |
1369 | */ |
1370 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1371 | { | |
1372 | struct fc_frame *fp; | |
1373 | struct fc_ba_acc *ap; | |
1374 | struct fc_frame_header *fh; | |
1375 | struct fc_seq *sp; | |
1376 | ||
1377 | if (!ep) | |
1378 | goto reject; | |
f95b35cf BVA |
1379 | |
1380 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); | |
1381 | if (!fp) | |
1382 | goto free; | |
1383 | ||
42e9a92f RL |
1384 | spin_lock_bh(&ep->ex_lock); |
1385 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1386 | spin_unlock_bh(&ep->ex_lock); | |
f95b35cf BVA |
1387 | |
1388 | fc_frame_free(fp); | |
42e9a92f RL |
1389 | goto reject; |
1390 | } | |
cae7b6dd BVA |
1391 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { |
1392 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
42e9a92f | 1393 | fc_exch_hold(ep); /* hold for REC_QUAL */ |
cae7b6dd | 1394 | } |
42e9a92f | 1395 | fc_exch_timer_set_locked(ep, ep->r_a_tov); |
42e9a92f RL |
1396 | fh = fc_frame_header_get(fp); |
1397 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1398 | memset(ap, 0, sizeof(*ap)); | |
1399 | sp = &ep->seq; | |
1400 | ap->ba_high_seq_cnt = htons(0xffff); | |
1401 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1402 | ap->ba_seq_id = sp->id; | |
1403 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1404 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1405 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1406 | } | |
a7e84f2b | 1407 | sp = fc_seq_start_next_locked(sp); |
42e9a92f | 1408 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); |
cae7b6dd | 1409 | ep->esb_stat |= ESB_ST_ABNORMAL; |
fb00cc23 | 1410 | spin_unlock_bh(&ep->ex_lock); |
f95b35cf BVA |
1411 | |
1412 | free: | |
42e9a92f RL |
1413 | fc_frame_free(rx_fp); |
1414 | return; | |
1415 | ||
1416 | reject: | |
1417 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
f95b35cf | 1418 | goto free; |
42e9a92f RL |
1419 | } |
1420 | ||
239e8104 JE |
1421 | /** |
1422 | * fc_seq_assign() - Assign exchange and sequence for incoming request | |
1423 | * @lport: The local port that received the request | |
1424 | * @fp: The request frame | |
1425 | * | |
1426 | * On success, the sequence pointer will be returned and also in fr_seq(@fp). | |
62bdb645 JE |
1427 | * A reference will be held on the exchange/sequence for the caller, which |
1428 | * must call fc_seq_release(). | |
239e8104 JE |
1429 | */ |
1430 | static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) | |
1431 | { | |
1432 | struct fc_exch_mgr_anchor *ema; | |
1433 | ||
1434 | WARN_ON(lport != fr_dev(fp)); | |
1435 | WARN_ON(fr_seq(fp)); | |
1436 | fr_seq(fp) = NULL; | |
1437 | ||
1438 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1439 | if ((!ema->match || ema->match(fp)) && | |
530994d6 | 1440 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) |
239e8104 JE |
1441 | break; |
1442 | return fr_seq(fp); | |
1443 | } | |
1444 | ||
62bdb645 JE |
1445 | /** |
1446 | * fc_seq_release() - Release the hold | |
1447 | * @sp: The sequence. | |
1448 | */ | |
1449 | static void fc_seq_release(struct fc_seq *sp) | |
1450 | { | |
1451 | fc_exch_release(fc_seq_exch(sp)); | |
1452 | } | |
1453 | ||
3a3b42bf | 1454 | /** |
92261156 | 1455 | * fc_exch_recv_req() - Handler for an incoming request |
3a3b42bf RL |
1456 | * @lport: The local port that received the request |
1457 | * @mp: The EM that the exchange is on | |
1458 | * @fp: The request frame | |
92261156 JE |
1459 | * |
1460 | * This is used when the other end is originating the exchange | |
1461 | * and the sequence. | |
42e9a92f | 1462 | */ |
3a3b42bf | 1463 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
42e9a92f RL |
1464 | struct fc_frame *fp) |
1465 | { | |
1466 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1467 | struct fc_seq *sp = NULL; | |
1468 | struct fc_exch *ep = NULL; | |
42e9a92f RL |
1469 | enum fc_pf_rjt_reason reject; |
1470 | ||
174e1ebf CL |
1471 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
1472 | * problem now that we know a new exchange needs to be allocated | |
1473 | */ | |
3a3b42bf RL |
1474 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
1475 | if (!lport) { | |
174e1ebf CL |
1476 | fc_frame_free(fp); |
1477 | return; | |
1478 | } | |
92261156 JE |
1479 | fr_dev(fp) = lport; |
1480 | ||
1481 | BUG_ON(fr_seq(fp)); /* XXX remove later */ | |
1482 | ||
1483 | /* | |
1484 | * If the RX_ID is 0xffff, don't allocate an exchange. | |
1485 | * The upper-level protocol may request one later, if needed. | |
1486 | */ | |
1487 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) | |
1488 | return lport->tt.lport_recv(lport, fp); | |
174e1ebf | 1489 | |
3a3b42bf | 1490 | reject = fc_seq_lookup_recip(lport, mp, fp); |
42e9a92f RL |
1491 | if (reject == FC_RJT_NONE) { |
1492 | sp = fr_seq(fp); /* sequence will be held */ | |
1493 | ep = fc_seq_exch(sp); | |
42e9a92f | 1494 | fc_seq_send_ack(sp, fp); |
f60e12e9 | 1495 | ep->encaps = fr_encaps(fp); |
42e9a92f RL |
1496 | |
1497 | /* | |
1498 | * Call the receive function. | |
1499 | * | |
1500 | * The receive function may allocate a new sequence | |
1501 | * over the old one, so we shouldn't change the | |
1502 | * sequence after this. | |
1503 | * | |
1504 | * The frame will be freed by the receive function. | |
1505 | * If new exch resp handler is valid then call that | |
1506 | * first. | |
1507 | */ | |
7030fd62 | 1508 | if (!fc_invoke_resp(ep, sp, fp)) |
92261156 | 1509 | lport->tt.lport_recv(lport, fp); |
42e9a92f RL |
1510 | fc_exch_release(ep); /* release from lookup */ |
1511 | } else { | |
3a3b42bf RL |
1512 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
1513 | reject); | |
42e9a92f RL |
1514 | fc_frame_free(fp); |
1515 | } | |
1516 | } | |
1517 | ||
3a3b42bf RL |
1518 | /** |
1519 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other | |
1520 | * end is the originator of the sequence that is a | |
1521 | * response to our initial exchange | |
1522 | * @mp: The EM that the exchange is on | |
1523 | * @fp: The response frame | |
42e9a92f RL |
1524 | */ |
1525 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1526 | { | |
1527 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1528 | struct fc_seq *sp; | |
1529 | struct fc_exch *ep; | |
1530 | enum fc_sof sof; | |
1531 | u32 f_ctl; | |
42e9a92f RL |
1532 | int rc; |
1533 | ||
1534 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1535 | if (!ep) { | |
1536 | atomic_inc(&mp->stats.xid_not_found); | |
1537 | goto out; | |
1538 | } | |
30121d14 SM |
1539 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1540 | atomic_inc(&mp->stats.xid_not_found); | |
8236554a | 1541 | goto rel; |
30121d14 | 1542 | } |
42e9a92f RL |
1543 | if (ep->rxid == FC_XID_UNKNOWN) |
1544 | ep->rxid = ntohs(fh->fh_rx_id); | |
1545 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1546 | atomic_inc(&mp->stats.xid_not_found); | |
1547 | goto rel; | |
1548 | } | |
1549 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1550 | ep->did != FC_FID_FLOGI) { | |
1551 | atomic_inc(&mp->stats.xid_not_found); | |
1552 | goto rel; | |
1553 | } | |
1554 | sof = fr_sof(fp); | |
a104c844 | 1555 | sp = &ep->seq; |
b3667f91 | 1556 | if (fc_sof_is_init(sof)) { |
42e9a92f | 1557 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 JE |
1558 | sp->id = fh->fh_seq_id; |
1559 | } else if (sp->id != fh->fh_seq_id) { | |
1560 | atomic_inc(&mp->stats.seq_not_found); | |
1561 | goto rel; | |
42e9a92f | 1562 | } |
a104c844 | 1563 | |
42e9a92f RL |
1564 | f_ctl = ntoh24(fh->fh_f_ctl); |
1565 | fr_seq(fp) = sp; | |
5d73bea2 BVA |
1566 | |
1567 | spin_lock_bh(&ep->ex_lock); | |
42e9a92f RL |
1568 | if (f_ctl & FC_FC_SEQ_INIT) |
1569 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
5d73bea2 | 1570 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
1571 | |
1572 | if (fc_sof_needs_ack(sof)) | |
1573 | fc_seq_send_ack(sp, fp); | |
42e9a92f RL |
1574 | |
1575 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1576 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1577 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1578 | spin_lock_bh(&ep->ex_lock); | |
1579 | rc = fc_exch_done_locked(ep); | |
1580 | WARN_ON(fc_seq_exch(sp) != ep); | |
1581 | spin_unlock_bh(&ep->ex_lock); | |
1582 | if (!rc) | |
b2f0091f | 1583 | fc_exch_delete(ep); |
42e9a92f RL |
1584 | } |
1585 | ||
1586 | /* | |
1587 | * Call the receive function. | |
1588 | * The sequence is held (has a refcnt) for us, | |
1589 | * but not for the receive function. | |
1590 | * | |
1591 | * The receive function may allocate a new sequence | |
1592 | * over the old one, so we shouldn't change the | |
1593 | * sequence after this. | |
1594 | * | |
1595 | * The frame will be freed by the receive function. | |
1596 | * If new exch resp handler is valid then call that | |
1597 | * first. | |
1598 | */ | |
7030fd62 BVA |
1599 | fc_invoke_resp(ep, sp, fp); |
1600 | ||
42e9a92f RL |
1601 | fc_exch_release(ep); |
1602 | return; | |
1603 | rel: | |
1604 | fc_exch_release(ep); | |
1605 | out: | |
1606 | fc_frame_free(fp); | |
1607 | } | |
1608 | ||
3a3b42bf RL |
1609 | /** |
1610 | * fc_exch_recv_resp() - Handler for a sequence where other end is | |
1611 | * responding to our sequence | |
1612 | * @mp: The EM that the exchange is on | |
1613 | * @fp: The response frame | |
42e9a92f RL |
1614 | */ |
1615 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1616 | { | |
1617 | struct fc_seq *sp; | |
1618 | ||
1619 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1620 | |
1621 | if (!sp) | |
42e9a92f | 1622 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1623 | else |
42e9a92f | 1624 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1625 | |
42e9a92f RL |
1626 | fc_frame_free(fp); |
1627 | } | |
1628 | ||
3a3b42bf RL |
1629 | /** |
1630 | * fc_exch_abts_resp() - Handler for a response to an ABT | |
1631 | * @ep: The exchange that the frame is on | |
1632 | * @fp: The response frame | |
1633 | * | |
1634 | * This response would be to an ABTS cancelling an exchange or sequence. | |
1635 | * The response can be either BA_ACC or BA_RJT | |
42e9a92f RL |
1636 | */ |
1637 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1638 | { | |
42e9a92f RL |
1639 | struct fc_frame_header *fh; |
1640 | struct fc_ba_acc *ap; | |
1641 | struct fc_seq *sp; | |
1642 | u16 low; | |
1643 | u16 high; | |
1644 | int rc = 1, has_rec = 0; | |
1645 | ||
1646 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1647 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1648 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f | 1649 | |
b29a4f30 | 1650 | if (cancel_delayed_work_sync(&ep->timeout_work)) { |
3a292605 | 1651 | FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n"); |
42e9a92f | 1652 | fc_exch_release(ep); /* release from pending timer hold */ |
b29a4f30 | 1653 | } |
42e9a92f RL |
1654 | |
1655 | spin_lock_bh(&ep->ex_lock); | |
1656 | switch (fh->fh_r_ctl) { | |
1657 | case FC_RCTL_BA_ACC: | |
1658 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1659 | if (!ap) | |
1660 | break; | |
1661 | ||
1662 | /* | |
1663 | * Decide whether to establish a Recovery Qualifier. | |
1664 | * We do this if there is a non-empty SEQ_CNT range and | |
1665 | * SEQ_ID is the same as the one we aborted. | |
1666 | */ | |
1667 | low = ntohs(ap->ba_low_seq_cnt); | |
1668 | high = ntohs(ap->ba_high_seq_cnt); | |
1669 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1670 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1671 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1672 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1673 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1674 | has_rec = 1; | |
1675 | } | |
1676 | break; | |
1677 | case FC_RCTL_BA_RJT: | |
1678 | break; | |
1679 | default: | |
1680 | break; | |
1681 | } | |
1682 | ||
42e9a92f RL |
1683 | /* do we need to do some other checks here. Can we reuse more of |
1684 | * fc_exch_recv_seq_resp | |
1685 | */ | |
1686 | sp = &ep->seq; | |
1687 | /* | |
1688 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1689 | */ | |
1690 | if (ep->fh_type != FC_TYPE_FCP && | |
1691 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1692 | rc = fc_exch_done_locked(ep); | |
1693 | spin_unlock_bh(&ep->ex_lock); | |
7030fd62 BVA |
1694 | |
1695 | fc_exch_hold(ep); | |
42e9a92f | 1696 | if (!rc) |
b2f0091f | 1697 | fc_exch_delete(ep); |
7030fd62 | 1698 | fc_invoke_resp(ep, sp, fp); |
42e9a92f RL |
1699 | if (has_rec) |
1700 | fc_exch_timer_set(ep, ep->r_a_tov); | |
7030fd62 | 1701 | fc_exch_release(ep); |
42e9a92f RL |
1702 | } |
1703 | ||
3a3b42bf RL |
1704 | /** |
1705 | * fc_exch_recv_bls() - Handler for a BLS sequence | |
1706 | * @mp: The EM that the exchange is on | |
1707 | * @fp: The request frame | |
1708 | * | |
1709 | * The BLS frame is always a sequence initiated by the remote side. | |
42e9a92f RL |
1710 | * We may be either the originator or recipient of the exchange. |
1711 | */ | |
1712 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1713 | { | |
1714 | struct fc_frame_header *fh; | |
1715 | struct fc_exch *ep; | |
1716 | u32 f_ctl; | |
1717 | ||
1718 | fh = fc_frame_header_get(fp); | |
1719 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1720 | fr_seq(fp) = NULL; | |
1721 | ||
1722 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1723 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1724 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1725 | spin_lock_bh(&ep->ex_lock); | |
1726 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1727 | spin_unlock_bh(&ep->ex_lock); | |
1728 | } | |
1729 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1730 | /* | |
1731 | * A response to a sequence we initiated. | |
1732 | * This should only be ACKs for class 2 or F. | |
1733 | */ | |
1734 | switch (fh->fh_r_ctl) { | |
1735 | case FC_RCTL_ACK_1: | |
1736 | case FC_RCTL_ACK_0: | |
1737 | break; | |
1738 | default: | |
d4042e9c | 1739 | if (ep) |
b20d9bfd | 1740 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received\n", |
d4042e9c BPG |
1741 | fh->fh_r_ctl, |
1742 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1743 | break; |
1744 | } | |
1745 | fc_frame_free(fp); | |
1746 | } else { | |
1747 | switch (fh->fh_r_ctl) { | |
1748 | case FC_RCTL_BA_RJT: | |
1749 | case FC_RCTL_BA_ACC: | |
1750 | if (ep) | |
1751 | fc_exch_abts_resp(ep, fp); | |
1752 | else | |
1753 | fc_frame_free(fp); | |
1754 | break; | |
1755 | case FC_RCTL_BA_ABTS: | |
1756 | fc_exch_recv_abts(ep, fp); | |
1757 | break; | |
1758 | default: /* ignore junk */ | |
1759 | fc_frame_free(fp); | |
1760 | break; | |
1761 | } | |
1762 | } | |
1763 | if (ep) | |
1764 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1765 | } | |
1766 | ||
3a3b42bf RL |
1767 | /** |
1768 | * fc_seq_ls_acc() - Accept sequence with LS_ACC | |
92261156 | 1769 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1770 | * |
42e9a92f RL |
1771 | * If this fails due to allocation or transmit congestion, assume the |
1772 | * originator will repeat the sequence. | |
1773 | */ | |
92261156 | 1774 | static void fc_seq_ls_acc(struct fc_frame *rx_fp) |
42e9a92f | 1775 | { |
92261156 | 1776 | struct fc_lport *lport; |
42e9a92f RL |
1777 | struct fc_els_ls_acc *acc; |
1778 | struct fc_frame *fp; | |
1779 | ||
92261156 JE |
1780 | lport = fr_dev(rx_fp); |
1781 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1782 | if (!fp) | |
1783 | return; | |
1784 | acc = fc_frame_payload_get(fp, sizeof(*acc)); | |
1785 | memset(acc, 0, sizeof(*acc)); | |
1786 | acc->la_cmd = ELS_LS_ACC; | |
1787 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1788 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1789 | } |
1790 | ||
3a3b42bf RL |
1791 | /** |
1792 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT | |
92261156 | 1793 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1794 | * @reason: The reason the sequence is being rejected |
92261156 | 1795 | * @explan: The explanation for the rejection |
3a3b42bf | 1796 | * |
42e9a92f RL |
1797 | * If this fails due to allocation or transmit congestion, assume the |
1798 | * originator will repeat the sequence. | |
1799 | */ | |
92261156 | 1800 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, |
42e9a92f RL |
1801 | enum fc_els_rjt_explan explan) |
1802 | { | |
92261156 | 1803 | struct fc_lport *lport; |
42e9a92f RL |
1804 | struct fc_els_ls_rjt *rjt; |
1805 | struct fc_frame *fp; | |
1806 | ||
92261156 JE |
1807 | lport = fr_dev(rx_fp); |
1808 | fp = fc_frame_alloc(lport, sizeof(*rjt)); | |
1809 | if (!fp) | |
1810 | return; | |
1811 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1812 | memset(rjt, 0, sizeof(*rjt)); | |
1813 | rjt->er_cmd = ELS_LS_RJT; | |
1814 | rjt->er_reason = reason; | |
1815 | rjt->er_explan = explan; | |
1816 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1817 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1818 | } |
1819 | ||
3a3b42bf RL |
1820 | /** |
1821 | * fc_exch_reset() - Reset an exchange | |
1822 | * @ep: The exchange to be reset | |
7030fd62 BVA |
1823 | * |
1824 | * Note: May sleep if invoked from outside a response handler. | |
3a3b42bf | 1825 | */ |
42e9a92f RL |
1826 | static void fc_exch_reset(struct fc_exch *ep) |
1827 | { | |
1828 | struct fc_seq *sp; | |
42e9a92f RL |
1829 | int rc = 1; |
1830 | ||
1831 | spin_lock_bh(&ep->ex_lock); | |
77a2b73a | 1832 | fc_exch_abort_locked(ep, 0); |
42e9a92f | 1833 | ep->state |= FC_EX_RST_CLEANUP; |
b29a4f30 | 1834 | fc_exch_timer_cancel(ep); |
42e9a92f RL |
1835 | if (ep->esb_stat & ESB_ST_REC_QUAL) |
1836 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1837 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
42e9a92f RL |
1838 | sp = &ep->seq; |
1839 | rc = fc_exch_done_locked(ep); | |
1840 | spin_unlock_bh(&ep->ex_lock); | |
7030fd62 BVA |
1841 | |
1842 | fc_exch_hold(ep); | |
1843 | ||
42e9a92f | 1844 | if (!rc) |
b2f0091f | 1845 | fc_exch_delete(ep); |
42e9a92f | 1846 | |
7030fd62 BVA |
1847 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED)); |
1848 | fc_seq_set_resp(sp, NULL, ep->arg); | |
1849 | fc_exch_release(ep); | |
42e9a92f RL |
1850 | } |
1851 | ||
b2f0091f | 1852 | /** |
3a3b42bf RL |
1853 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
1854 | * @lport: The local port that the exchange pool is on | |
1855 | * @pool: The exchange pool to be reset | |
1856 | * @sid: The source ID | |
1857 | * @did: The destination ID | |
b2f0091f | 1858 | * |
3a3b42bf RL |
1859 | * Resets a per cpu exches pool, releasing all of its sequences |
1860 | * and exchanges. If sid is non-zero then reset only exchanges | |
1861 | * we sourced from the local port's FID. If did is non-zero then | |
1862 | * only reset exchanges destined for the local port's FID. | |
42e9a92f | 1863 | */ |
b2f0091f VD |
1864 | static void fc_exch_pool_reset(struct fc_lport *lport, |
1865 | struct fc_exch_pool *pool, | |
1866 | u32 sid, u32 did) | |
42e9a92f RL |
1867 | { |
1868 | struct fc_exch *ep; | |
1869 | struct fc_exch *next; | |
1870 | ||
b2f0091f | 1871 | spin_lock_bh(&pool->lock); |
42e9a92f | 1872 | restart: |
b2f0091f VD |
1873 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
1874 | if ((lport == ep->lp) && | |
1875 | (sid == 0 || sid == ep->sid) && | |
1876 | (did == 0 || did == ep->did)) { | |
1877 | fc_exch_hold(ep); | |
1878 | spin_unlock_bh(&pool->lock); | |
1879 | ||
1880 | fc_exch_reset(ep); | |
1881 | ||
1882 | fc_exch_release(ep); | |
1883 | spin_lock_bh(&pool->lock); | |
1884 | ||
1885 | /* | |
1886 | * must restart loop incase while lock | |
1887 | * was down multiple eps were released. | |
1888 | */ | |
1889 | goto restart; | |
42e9a92f | 1890 | } |
b2f0091f | 1891 | } |
b6e3c840 VD |
1892 | pool->next_index = 0; |
1893 | pool->left = FC_XID_UNKNOWN; | |
1894 | pool->right = FC_XID_UNKNOWN; | |
b2f0091f VD |
1895 | spin_unlock_bh(&pool->lock); |
1896 | } | |
1897 | ||
1898 | /** | |
3a3b42bf RL |
1899 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
1900 | * @lport: The local port whose EMs are to be reset | |
1901 | * @sid: The source ID | |
1902 | * @did: The destination ID | |
b2f0091f | 1903 | * |
3a3b42bf RL |
1904 | * Reset all EMs associated with a given local port. Release all |
1905 | * sequences and exchanges. If sid is non-zero then reset only the | |
1906 | * exchanges sent from the local port's FID. If did is non-zero then | |
1907 | * reset only exchanges destined for the local port's FID. | |
b2f0091f VD |
1908 | */ |
1909 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) | |
1910 | { | |
1911 | struct fc_exch_mgr_anchor *ema; | |
1912 | unsigned int cpu; | |
1913 | ||
1914 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
1915 | for_each_possible_cpu(cpu) | |
1916 | fc_exch_pool_reset(lport, | |
1917 | per_cpu_ptr(ema->mp->pool, cpu), | |
1918 | sid, did); | |
42e9a92f | 1919 | } |
42e9a92f RL |
1920 | } |
1921 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1922 | ||
92261156 JE |
1923 | /** |
1924 | * fc_exch_lookup() - find an exchange | |
1925 | * @lport: The local port | |
1926 | * @xid: The exchange ID | |
1927 | * | |
1928 | * Returns exchange pointer with hold for caller, or NULL if not found. | |
1929 | */ | |
1930 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) | |
1931 | { | |
1932 | struct fc_exch_mgr_anchor *ema; | |
1933 | ||
1934 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1935 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) | |
1936 | return fc_exch_find(ema->mp, xid); | |
1937 | return NULL; | |
1938 | } | |
1939 | ||
3a3b42bf RL |
1940 | /** |
1941 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests | |
92261156 | 1942 | * @rfp: The REC frame, not freed here. |
3a3b42bf | 1943 | * |
42e9a92f RL |
1944 | * Note that the requesting port may be different than the S_ID in the request. |
1945 | */ | |
92261156 | 1946 | static void fc_exch_els_rec(struct fc_frame *rfp) |
42e9a92f | 1947 | { |
92261156 | 1948 | struct fc_lport *lport; |
42e9a92f RL |
1949 | struct fc_frame *fp; |
1950 | struct fc_exch *ep; | |
42e9a92f RL |
1951 | struct fc_els_rec *rp; |
1952 | struct fc_els_rec_acc *acc; | |
1953 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
1954 | enum fc_els_rjt_explan explan; | |
1955 | u32 sid; | |
1956 | u16 rxid; | |
1957 | u16 oxid; | |
1958 | ||
92261156 | 1959 | lport = fr_dev(rfp); |
42e9a92f RL |
1960 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); |
1961 | explan = ELS_EXPL_INV_LEN; | |
1962 | if (!rp) | |
1963 | goto reject; | |
1964 | sid = ntoh24(rp->rec_s_id); | |
1965 | rxid = ntohs(rp->rec_rx_id); | |
1966 | oxid = ntohs(rp->rec_ox_id); | |
1967 | ||
92261156 JE |
1968 | ep = fc_exch_lookup(lport, |
1969 | sid == fc_host_port_id(lport->host) ? oxid : rxid); | |
42e9a92f | 1970 | explan = ELS_EXPL_OXID_RXID; |
92261156 JE |
1971 | if (!ep) |
1972 | goto reject; | |
1973 | if (ep->oid != sid || oxid != ep->oxid) | |
1974 | goto rel; | |
1975 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) | |
1976 | goto rel; | |
1977 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
1978 | if (!fp) | |
42e9a92f | 1979 | goto out; |
92261156 | 1980 | |
42e9a92f RL |
1981 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
1982 | memset(acc, 0, sizeof(*acc)); | |
1983 | acc->reca_cmd = ELS_LS_ACC; | |
1984 | acc->reca_ox_id = rp->rec_ox_id; | |
1985 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
1986 | acc->reca_rx_id = htons(ep->rxid); | |
1987 | if (ep->sid == ep->oid) | |
1988 | hton24(acc->reca_rfid, ep->did); | |
1989 | else | |
1990 | hton24(acc->reca_rfid, ep->sid); | |
1991 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
1992 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
1993 | ESB_ST_SEQ_INIT | | |
1994 | ESB_ST_COMPLETE)); | |
92261156 JE |
1995 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); |
1996 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1997 | out: |
1998 | fc_exch_release(ep); | |
42e9a92f RL |
1999 | return; |
2000 | ||
2001 | rel: | |
2002 | fc_exch_release(ep); | |
2003 | reject: | |
92261156 | 2004 | fc_seq_ls_rjt(rfp, reason, explan); |
42e9a92f RL |
2005 | } |
2006 | ||
3a3b42bf RL |
2007 | /** |
2008 | * fc_exch_rrq_resp() - Handler for RRQ responses | |
2009 | * @sp: The sequence that the RRQ is on | |
2010 | * @fp: The RRQ frame | |
2011 | * @arg: The exchange that the RRQ is on | |
42e9a92f RL |
2012 | * |
2013 | * TODO: fix error handler. | |
2014 | */ | |
2015 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
2016 | { | |
2017 | struct fc_exch *aborted_ep = arg; | |
2018 | unsigned int op; | |
2019 | ||
2020 | if (IS_ERR(fp)) { | |
2021 | int err = PTR_ERR(fp); | |
2022 | ||
78342da3 | 2023 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 2024 | goto cleanup; |
7414705e RL |
2025 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
2026 | "frame error %d\n", err); | |
42e9a92f RL |
2027 | return; |
2028 | } | |
2029 | ||
2030 | op = fc_frame_payload_op(fp); | |
2031 | fc_frame_free(fp); | |
2032 | ||
2033 | switch (op) { | |
2034 | case ELS_LS_RJT: | |
b20d9bfd | 2035 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ\n"); |
42e9a92f RL |
2036 | /* fall through */ |
2037 | case ELS_LS_ACC: | |
2038 | goto cleanup; | |
2039 | default: | |
b20d9bfd BVA |
2040 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x for RRQ\n", |
2041 | op); | |
42e9a92f RL |
2042 | return; |
2043 | } | |
2044 | ||
2045 | cleanup: | |
2046 | fc_exch_done(&aborted_ep->seq); | |
2047 | /* drop hold for rec qual */ | |
2048 | fc_exch_release(aborted_ep); | |
2049 | } | |
2050 | ||
1a7b75ae RL |
2051 | |
2052 | /** | |
3a3b42bf RL |
2053 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
2054 | * @lport: The local port to send the frame on | |
2055 | * @fp: The frame to be sent | |
2056 | * @resp: The response handler for this request | |
2057 | * @destructor: The destructor for the exchange | |
2058 | * @arg: The argument to be passed to the response handler | |
2059 | * @timer_msec: The timeout period for the exchange | |
2060 | * | |
2061 | * The frame pointer with some of the header's fields must be | |
2062 | * filled before calling this routine, those fields are: | |
2063 | * | |
2064 | * - routing control | |
2065 | * - FC port did | |
2066 | * - FC port sid | |
2067 | * - FC header type | |
2068 | * - frame control | |
2069 | * - parameter or relative offset | |
1a7b75ae | 2070 | */ |
3a3b42bf | 2071 | static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
1a7b75ae RL |
2072 | struct fc_frame *fp, |
2073 | void (*resp)(struct fc_seq *, | |
2074 | struct fc_frame *fp, | |
2075 | void *arg), | |
2076 | void (*destructor)(struct fc_seq *, | |
2077 | void *), | |
2078 | void *arg, u32 timer_msec) | |
2079 | { | |
2080 | struct fc_exch *ep; | |
2081 | struct fc_seq *sp = NULL; | |
2082 | struct fc_frame_header *fh; | |
3ee17f59 | 2083 | struct fc_fcp_pkt *fsp = NULL; |
1a7b75ae RL |
2084 | int rc = 1; |
2085 | ||
3a3b42bf | 2086 | ep = fc_exch_alloc(lport, fp); |
1a7b75ae RL |
2087 | if (!ep) { |
2088 | fc_frame_free(fp); | |
2089 | return NULL; | |
2090 | } | |
2091 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
2092 | fh = fc_frame_header_get(fp); | |
2093 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
2094 | ep->resp = resp; | |
2095 | ep->destructor = destructor; | |
2096 | ep->arg = arg; | |
2097 | ep->r_a_tov = FC_DEF_R_A_TOV; | |
3a3b42bf | 2098 | ep->lp = lport; |
1a7b75ae RL |
2099 | sp = &ep->seq; |
2100 | ||
2101 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
2102 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
2103 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
2104 | sp->cnt++; | |
2105 | ||
3ee17f59 YZ |
2106 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) { |
2107 | fsp = fr_fsp(fp); | |
1a7b75ae | 2108 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
3ee17f59 | 2109 | } |
1a7b75ae | 2110 | |
3a3b42bf | 2111 | if (unlikely(lport->tt.frame_send(lport, fp))) |
1a7b75ae RL |
2112 | goto err; |
2113 | ||
2114 | if (timer_msec) | |
2115 | fc_exch_timer_set_locked(ep, timer_msec); | |
2116 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
2117 | ||
2118 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
2119 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
2120 | spin_unlock_bh(&ep->ex_lock); | |
2121 | return sp; | |
2122 | err: | |
3ee17f59 YZ |
2123 | if (fsp) |
2124 | fc_fcp_ddp_done(fsp); | |
1a7b75ae RL |
2125 | rc = fc_exch_done_locked(ep); |
2126 | spin_unlock_bh(&ep->ex_lock); | |
2127 | if (!rc) | |
2128 | fc_exch_delete(ep); | |
2129 | return NULL; | |
2130 | } | |
2131 | ||
3a3b42bf RL |
2132 | /** |
2133 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command | |
2134 | * @ep: The exchange to send the RRQ on | |
2135 | * | |
42e9a92f RL |
2136 | * This tells the remote port to stop blocking the use of |
2137 | * the exchange and the seq_cnt range. | |
2138 | */ | |
2139 | static void fc_exch_rrq(struct fc_exch *ep) | |
2140 | { | |
3a3b42bf | 2141 | struct fc_lport *lport; |
42e9a92f RL |
2142 | struct fc_els_rrq *rrq; |
2143 | struct fc_frame *fp; | |
42e9a92f RL |
2144 | u32 did; |
2145 | ||
3a3b42bf | 2146 | lport = ep->lp; |
42e9a92f | 2147 | |
3a3b42bf | 2148 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
42e9a92f | 2149 | if (!fp) |
a0cc1ecc VD |
2150 | goto retry; |
2151 | ||
42e9a92f RL |
2152 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
2153 | memset(rrq, 0, sizeof(*rrq)); | |
2154 | rrq->rrq_cmd = ELS_RRQ; | |
2155 | hton24(rrq->rrq_s_id, ep->sid); | |
2156 | rrq->rrq_ox_id = htons(ep->oxid); | |
2157 | rrq->rrq_rx_id = htons(ep->rxid); | |
2158 | ||
2159 | did = ep->did; | |
2160 | if (ep->esb_stat & ESB_ST_RESP) | |
2161 | did = ep->sid; | |
2162 | ||
2163 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
7b2787ec | 2164 | lport->port_id, FC_TYPE_ELS, |
42e9a92f RL |
2165 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
2166 | ||
3a3b42bf RL |
2167 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
2168 | lport->e_d_tov)) | |
a0cc1ecc VD |
2169 | return; |
2170 | ||
2171 | retry: | |
2172 | spin_lock_bh(&ep->ex_lock); | |
2173 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
2174 | spin_unlock_bh(&ep->ex_lock); | |
2175 | /* drop hold for rec qual */ | |
2176 | fc_exch_release(ep); | |
42e9a92f RL |
2177 | return; |
2178 | } | |
a0cc1ecc VD |
2179 | ep->esb_stat |= ESB_ST_REC_QUAL; |
2180 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
2181 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
2182 | } |
2183 | ||
3a3b42bf RL |
2184 | /** |
2185 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests | |
92261156 | 2186 | * @fp: The RRQ frame, not freed here. |
42e9a92f | 2187 | */ |
92261156 | 2188 | static void fc_exch_els_rrq(struct fc_frame *fp) |
42e9a92f | 2189 | { |
92261156 | 2190 | struct fc_lport *lport; |
3f127ad9 | 2191 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
42e9a92f RL |
2192 | struct fc_els_rrq *rp; |
2193 | u32 sid; | |
2194 | u16 xid; | |
2195 | enum fc_els_rjt_explan explan; | |
2196 | ||
92261156 | 2197 | lport = fr_dev(fp); |
42e9a92f RL |
2198 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
2199 | explan = ELS_EXPL_INV_LEN; | |
2200 | if (!rp) | |
2201 | goto reject; | |
2202 | ||
2203 | /* | |
2204 | * lookup subject exchange. | |
2205 | */ | |
42e9a92f | 2206 | sid = ntoh24(rp->rrq_s_id); /* subject source */ |
92261156 JE |
2207 | xid = fc_host_port_id(lport->host) == sid ? |
2208 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
2209 | ep = fc_exch_lookup(lport, xid); | |
42e9a92f RL |
2210 | explan = ELS_EXPL_OXID_RXID; |
2211 | if (!ep) | |
2212 | goto reject; | |
2213 | spin_lock_bh(&ep->ex_lock); | |
2214 | if (ep->oxid != ntohs(rp->rrq_ox_id)) | |
2215 | goto unlock_reject; | |
2216 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
2217 | ep->rxid != FC_XID_UNKNOWN) | |
2218 | goto unlock_reject; | |
2219 | explan = ELS_EXPL_SID; | |
2220 | if (ep->sid != sid) | |
2221 | goto unlock_reject; | |
2222 | ||
2223 | /* | |
2224 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
2225 | */ | |
2226 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
2227 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
2228 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
2229 | } | |
b29a4f30 VD |
2230 | if (ep->esb_stat & ESB_ST_COMPLETE) |
2231 | fc_exch_timer_cancel(ep); | |
42e9a92f RL |
2232 | |
2233 | spin_unlock_bh(&ep->ex_lock); | |
2234 | ||
2235 | /* | |
2236 | * Send LS_ACC. | |
2237 | */ | |
92261156 | 2238 | fc_seq_ls_acc(fp); |
3f127ad9 | 2239 | goto out; |
42e9a92f RL |
2240 | |
2241 | unlock_reject: | |
2242 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f | 2243 | reject: |
92261156 | 2244 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); |
3f127ad9 | 2245 | out: |
3f127ad9 VD |
2246 | if (ep) |
2247 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
42e9a92f RL |
2248 | } |
2249 | ||
4e5fae7a VD |
2250 | /** |
2251 | * fc_exch_update_stats() - update exches stats to lport | |
2252 | * @lport: The local port to update exchange manager stats | |
2253 | */ | |
2254 | void fc_exch_update_stats(struct fc_lport *lport) | |
2255 | { | |
2256 | struct fc_host_statistics *st; | |
2257 | struct fc_exch_mgr_anchor *ema; | |
2258 | struct fc_exch_mgr *mp; | |
2259 | ||
2260 | st = &lport->host_stats; | |
2261 | ||
2262 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2263 | mp = ema->mp; | |
2264 | st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch); | |
2265 | st->fc_no_free_exch_xid += | |
2266 | atomic_read(&mp->stats.no_free_exch_xid); | |
2267 | st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found); | |
2268 | st->fc_xid_busy += atomic_read(&mp->stats.xid_busy); | |
2269 | st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found); | |
2270 | st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp); | |
2271 | } | |
2272 | } | |
2273 | EXPORT_SYMBOL(fc_exch_update_stats); | |
2274 | ||
3a3b42bf RL |
2275 | /** |
2276 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs | |
2277 | * @lport: The local port to add the exchange manager to | |
2278 | * @mp: The exchange manager to be added to the local port | |
2279 | * @match: The match routine that indicates when this EM should be used | |
2280 | */ | |
96316099 VD |
2281 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
2282 | struct fc_exch_mgr *mp, | |
2283 | bool (*match)(struct fc_frame *)) | |
2284 | { | |
2285 | struct fc_exch_mgr_anchor *ema; | |
2286 | ||
2287 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
2288 | if (!ema) | |
2289 | return ema; | |
2290 | ||
2291 | ema->mp = mp; | |
2292 | ema->match = match; | |
2293 | /* add EM anchor to EM anchors list */ | |
2294 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
2295 | kref_get(&mp->kref); | |
2296 | return ema; | |
2297 | } | |
2298 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
2299 | ||
3a3b42bf RL |
2300 | /** |
2301 | * fc_exch_mgr_destroy() - Destroy an exchange manager | |
2302 | * @kref: The reference to the EM to be destroyed | |
2303 | */ | |
96316099 VD |
2304 | static void fc_exch_mgr_destroy(struct kref *kref) |
2305 | { | |
2306 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
2307 | ||
96316099 | 2308 | mempool_destroy(mp->ep_pool); |
e4bc50be | 2309 | free_percpu(mp->pool); |
96316099 VD |
2310 | kfree(mp); |
2311 | } | |
2312 | ||
3a3b42bf RL |
2313 | /** |
2314 | * fc_exch_mgr_del() - Delete an EM from a local port's list | |
2315 | * @ema: The exchange manager anchor identifying the EM to be deleted | |
2316 | */ | |
96316099 VD |
2317 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
2318 | { | |
2319 | /* remove EM anchor from EM anchors list */ | |
2320 | list_del(&ema->ema_list); | |
2321 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
2322 | kfree(ema); | |
2323 | } | |
2324 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
2325 | ||
174e1ebf | 2326 | /** |
3a3b42bf RL |
2327 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
2328 | * @src: Source lport to clone exchange managers from | |
2329 | * @dst: New lport that takes references to all the exchange managers | |
174e1ebf CL |
2330 | */ |
2331 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) | |
2332 | { | |
2333 | struct fc_exch_mgr_anchor *ema, *tmp; | |
2334 | ||
2335 | list_for_each_entry(ema, &src->ema_list, ema_list) { | |
2336 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) | |
2337 | goto err; | |
2338 | } | |
2339 | return 0; | |
2340 | err: | |
2341 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) | |
2342 | fc_exch_mgr_del(ema); | |
2343 | return -ENOMEM; | |
2344 | } | |
72fa396b | 2345 | EXPORT_SYMBOL(fc_exch_mgr_list_clone); |
174e1ebf | 2346 | |
3a3b42bf RL |
2347 | /** |
2348 | * fc_exch_mgr_alloc() - Allocate an exchange manager | |
2349 | * @lport: The local port that the new EM will be associated with | |
2350 | * @class: The default FC class for new exchanges | |
2351 | * @min_xid: The minimum XID for exchanges from the new EM | |
2352 | * @max_xid: The maximum XID for exchanges from the new EM | |
2353 | * @match: The match routine for the new EM | |
2354 | */ | |
2355 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, | |
42e9a92f | 2356 | enum fc_class class, |
52ff878c VD |
2357 | u16 min_xid, u16 max_xid, |
2358 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
2359 | { |
2360 | struct fc_exch_mgr *mp; | |
e4bc50be VD |
2361 | u16 pool_exch_range; |
2362 | size_t pool_size; | |
2363 | unsigned int cpu; | |
2364 | struct fc_exch_pool *pool; | |
42e9a92f | 2365 | |
e4bc50be VD |
2366 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
2367 | (min_xid & fc_cpu_mask) != 0) { | |
3a3b42bf | 2368 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
7414705e | 2369 | min_xid, max_xid); |
42e9a92f RL |
2370 | return NULL; |
2371 | } | |
2372 | ||
2373 | /* | |
b2f0091f | 2374 | * allocate memory for EM |
42e9a92f | 2375 | */ |
b2f0091f | 2376 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
42e9a92f RL |
2377 | if (!mp) |
2378 | return NULL; | |
2379 | ||
2380 | mp->class = class; | |
42e9a92f RL |
2381 | /* adjust em exch xid range for offload */ |
2382 | mp->min_xid = min_xid; | |
011a9008 SC |
2383 | |
2384 | /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */ | |
2385 | pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) / | |
2386 | sizeof(struct fc_exch *); | |
2387 | if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) { | |
2388 | mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) + | |
2389 | min_xid - 1; | |
2390 | } else { | |
2391 | mp->max_xid = max_xid; | |
2392 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / | |
2393 | (fc_cpu_mask + 1); | |
2394 | } | |
42e9a92f RL |
2395 | |
2396 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
2397 | if (!mp->ep_pool) | |
2398 | goto free_mp; | |
2399 | ||
e4bc50be VD |
2400 | /* |
2401 | * Setup per cpu exch pool with entire exchange id range equally | |
2402 | * divided across all cpus. The exch pointers array memory is | |
2403 | * allocated for exch range per pool. | |
2404 | */ | |
e4bc50be VD |
2405 | mp->pool_max_index = pool_exch_range - 1; |
2406 | ||
2407 | /* | |
2408 | * Allocate and initialize per cpu exch pool | |
2409 | */ | |
2410 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
2411 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
2412 | if (!mp->pool) | |
2413 | goto free_mempool; | |
2414 | for_each_possible_cpu(cpu) { | |
2415 | pool = per_cpu_ptr(mp->pool, cpu); | |
b6e3c840 | 2416 | pool->next_index = 0; |
2034c19c HD |
2417 | pool->left = FC_XID_UNKNOWN; |
2418 | pool->right = FC_XID_UNKNOWN; | |
e4bc50be VD |
2419 | spin_lock_init(&pool->lock); |
2420 | INIT_LIST_HEAD(&pool->ex_list); | |
2421 | } | |
2422 | ||
52ff878c | 2423 | kref_init(&mp->kref); |
3a3b42bf | 2424 | if (!fc_exch_mgr_add(lport, mp, match)) { |
e4bc50be VD |
2425 | free_percpu(mp->pool); |
2426 | goto free_mempool; | |
52ff878c VD |
2427 | } |
2428 | ||
2429 | /* | |
2430 | * Above kref_init() sets mp->kref to 1 and then | |
2431 | * call to fc_exch_mgr_add incremented mp->kref again, | |
2432 | * so adjust that extra increment. | |
2433 | */ | |
2434 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
2435 | return mp; |
2436 | ||
e4bc50be VD |
2437 | free_mempool: |
2438 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
2439 | free_mp: |
2440 | kfree(mp); | |
2441 | return NULL; | |
2442 | } | |
2443 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
2444 | ||
3a3b42bf RL |
2445 | /** |
2446 | * fc_exch_mgr_free() - Free all exchange managers on a local port | |
2447 | * @lport: The local port whose EMs are to be freed | |
2448 | */ | |
52ff878c | 2449 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 2450 | { |
52ff878c VD |
2451 | struct fc_exch_mgr_anchor *ema, *next; |
2452 | ||
4ae1e19f | 2453 | flush_workqueue(fc_exch_workqueue); |
52ff878c VD |
2454 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
2455 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
2456 | } |
2457 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
2458 | ||
6c8cc1c0 KP |
2459 | /** |
2460 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending | |
2461 | * upon 'xid'. | |
2462 | * @f_ctl: f_ctl | |
2463 | * @lport: The local port the frame was received on | |
2464 | * @fh: The received frame header | |
2465 | */ | |
2466 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, | |
2467 | struct fc_lport *lport, | |
2468 | struct fc_frame_header *fh) | |
2469 | { | |
2470 | struct fc_exch_mgr_anchor *ema; | |
2471 | u16 xid; | |
2472 | ||
2473 | if (f_ctl & FC_FC_EX_CTX) | |
2474 | xid = ntohs(fh->fh_ox_id); | |
2475 | else { | |
2476 | xid = ntohs(fh->fh_rx_id); | |
2477 | if (xid == FC_XID_UNKNOWN) | |
2478 | return list_entry(lport->ema_list.prev, | |
2479 | typeof(*ema), ema_list); | |
2480 | } | |
2481 | ||
2482 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2483 | if ((xid >= ema->mp->min_xid) && | |
2484 | (xid <= ema->mp->max_xid)) | |
2485 | return ema; | |
2486 | } | |
2487 | return NULL; | |
2488 | } | |
3a3b42bf RL |
2489 | /** |
2490 | * fc_exch_recv() - Handler for received frames | |
2491 | * @lport: The local port the frame was received on | |
6c8cc1c0 | 2492 | * @fp: The received frame |
42e9a92f | 2493 | */ |
3a3b42bf | 2494 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
2495 | { |
2496 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c | 2497 | struct fc_exch_mgr_anchor *ema; |
6c8cc1c0 | 2498 | u32 f_ctl; |
42e9a92f RL |
2499 | |
2500 | /* lport lock ? */ | |
3a3b42bf RL |
2501 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
2502 | FC_LPORT_DBG(lport, "Receiving frames for an lport that " | |
7414705e | 2503 | "has not been initialized correctly\n"); |
42e9a92f RL |
2504 | fc_frame_free(fp); |
2505 | return; | |
2506 | } | |
2507 | ||
52ff878c | 2508 | f_ctl = ntoh24(fh->fh_f_ctl); |
6c8cc1c0 KP |
2509 | ema = fc_find_ema(f_ctl, lport, fh); |
2510 | if (!ema) { | |
2511 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," | |
2512 | "fc_ctl <0x%x>, xid <0x%x>\n", | |
2513 | f_ctl, | |
2514 | (f_ctl & FC_FC_EX_CTX) ? | |
2515 | ntohs(fh->fh_ox_id) : | |
2516 | ntohs(fh->fh_rx_id)); | |
2517 | fc_frame_free(fp); | |
2518 | return; | |
2519 | } | |
52ff878c | 2520 | |
42e9a92f RL |
2521 | /* |
2522 | * If frame is marked invalid, just drop it. | |
2523 | */ | |
42e9a92f RL |
2524 | switch (fr_eof(fp)) { |
2525 | case FC_EOF_T: | |
2526 | if (f_ctl & FC_FC_END_SEQ) | |
2527 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
2528 | /* fall through */ | |
2529 | case FC_EOF_N: | |
2530 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2531 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2532 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2533 | FC_FC_EX_CTX) | |
52ff878c | 2534 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2535 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2536 | fc_exch_recv_resp(ema->mp, fp); |
92261156 | 2537 | else /* no EX_CTX and no SEQ_CTX */ |
3a3b42bf | 2538 | fc_exch_recv_req(lport, ema->mp, fp); |
42e9a92f RL |
2539 | break; |
2540 | default: | |
3a3b42bf RL |
2541 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
2542 | fr_eof(fp)); | |
42e9a92f | 2543 | fc_frame_free(fp); |
42e9a92f RL |
2544 | } |
2545 | } | |
2546 | EXPORT_SYMBOL(fc_exch_recv); | |
2547 | ||
3a3b42bf RL |
2548 | /** |
2549 | * fc_exch_init() - Initialize the exchange layer for a local port | |
2550 | * @lport: The local port to initialize the exchange layer for | |
2551 | */ | |
2552 | int fc_exch_init(struct fc_lport *lport) | |
42e9a92f | 2553 | { |
3a3b42bf RL |
2554 | if (!lport->tt.seq_start_next) |
2555 | lport->tt.seq_start_next = fc_seq_start_next; | |
42e9a92f | 2556 | |
1a5c2d7e JE |
2557 | if (!lport->tt.seq_set_resp) |
2558 | lport->tt.seq_set_resp = fc_seq_set_resp; | |
2559 | ||
3a3b42bf RL |
2560 | if (!lport->tt.exch_seq_send) |
2561 | lport->tt.exch_seq_send = fc_exch_seq_send; | |
42e9a92f | 2562 | |
3a3b42bf RL |
2563 | if (!lport->tt.seq_send) |
2564 | lport->tt.seq_send = fc_seq_send; | |
42e9a92f | 2565 | |
3a3b42bf RL |
2566 | if (!lport->tt.seq_els_rsp_send) |
2567 | lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; | |
42e9a92f | 2568 | |
3a3b42bf RL |
2569 | if (!lport->tt.exch_done) |
2570 | lport->tt.exch_done = fc_exch_done; | |
42e9a92f | 2571 | |
3a3b42bf RL |
2572 | if (!lport->tt.exch_mgr_reset) |
2573 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
42e9a92f | 2574 | |
3a3b42bf RL |
2575 | if (!lport->tt.seq_exch_abort) |
2576 | lport->tt.seq_exch_abort = fc_seq_exch_abort; | |
42e9a92f | 2577 | |
239e8104 JE |
2578 | if (!lport->tt.seq_assign) |
2579 | lport->tt.seq_assign = fc_seq_assign; | |
2580 | ||
62bdb645 JE |
2581 | if (!lport->tt.seq_release) |
2582 | lport->tt.seq_release = fc_seq_release; | |
2583 | ||
89f19a59 VD |
2584 | return 0; |
2585 | } | |
2586 | EXPORT_SYMBOL(fc_exch_init); | |
2587 | ||
2588 | /** | |
2589 | * fc_setup_exch_mgr() - Setup an exchange manager | |
2590 | */ | |
55204909 | 2591 | int fc_setup_exch_mgr(void) |
89f19a59 VD |
2592 | { |
2593 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2594 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2595 | if (!fc_em_cachep) | |
2596 | return -ENOMEM; | |
2597 | ||
e4bc50be VD |
2598 | /* |
2599 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2600 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2601 | * to order of 2's * power and order is stored | |
2602 | * in fc_cpu_order as this is later required in | |
2603 | * mapping between an exch id and exch array index | |
2604 | * in per cpu exch pool. | |
2605 | * | |
2606 | * This round up is required to align fc_cpu_mask | |
2607 | * to exchange id's lower bits such that all incoming | |
2608 | * frames of an exchange gets delivered to the same | |
2609 | * cpu on which exchange originated by simple bitwise | |
2610 | * AND operation between fc_cpu_mask and exchange id. | |
2611 | */ | |
a84ea8c7 BVA |
2612 | fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids)); |
2613 | fc_cpu_mask = (1 << fc_cpu_order) - 1; | |
e4bc50be | 2614 | |
4ae1e19f VD |
2615 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
2616 | if (!fc_exch_workqueue) | |
6f06e3a7 | 2617 | goto err; |
42e9a92f | 2618 | return 0; |
6f06e3a7 HD |
2619 | err: |
2620 | kmem_cache_destroy(fc_em_cachep); | |
2621 | return -ENOMEM; | |
42e9a92f | 2622 | } |
42e9a92f | 2623 | |
3a3b42bf RL |
2624 | /** |
2625 | * fc_destroy_exch_mgr() - Destroy an exchange manager | |
2626 | */ | |
55204909 | 2627 | void fc_destroy_exch_mgr(void) |
42e9a92f | 2628 | { |
4ae1e19f | 2629 | destroy_workqueue(fc_exch_workqueue); |
42e9a92f RL |
2630 | kmem_cache_destroy(fc_em_cachep); |
2631 | } |