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a61127c2 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
42e9a92f RL |
2 | /* |
3 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | |
4 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. | |
5 | * Copyright(c) 2008 Mike Christie | |
6 | * | |
42e9a92f RL |
7 | * Maintained at www.Open-FCoE.org |
8 | */ | |
9 | ||
10 | /* | |
11 | * Fibre Channel exchange and sequence handling. | |
12 | */ | |
13 | ||
14 | #include <linux/timer.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
42e9a92f | 16 | #include <linux/err.h> |
09703660 | 17 | #include <linux/export.h> |
a84ea8c7 | 18 | #include <linux/log2.h> |
42e9a92f RL |
19 | |
20 | #include <scsi/fc/fc_fc2.h> | |
21 | ||
22 | #include <scsi/libfc.h> | |
42e9a92f | 23 | |
8866a5d9 RL |
24 | #include "fc_libfc.h" |
25 | ||
e4bc50be VD |
26 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
27 | EXPORT_SYMBOL(fc_cpu_mask); | |
28 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ | |
3a3b42bf | 29 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
55204909 | 30 | static struct workqueue_struct *fc_exch_workqueue; |
42e9a92f RL |
31 | |
32 | /* | |
33 | * Structure and function definitions for managing Fibre Channel Exchanges | |
34 | * and Sequences. | |
35 | * | |
36 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. | |
37 | * | |
38 | * fc_exch_mgr holds the exchange state for an N port | |
39 | * | |
40 | * fc_exch holds state for one exchange and links to its active sequence. | |
41 | * | |
42 | * fc_seq holds the state for an individual sequence. | |
43 | */ | |
44 | ||
3a3b42bf RL |
45 | /** |
46 | * struct fc_exch_pool - Per cpu exchange pool | |
47 | * @next_index: Next possible free exchange index | |
48 | * @total_exches: Total allocated exchanges | |
49 | * @lock: Exch pool lock | |
50 | * @ex_list: List of exchanges | |
74341d35 LJ |
51 | * @left: Cache of free slot in exch array |
52 | * @right: Cache of free slot in exch array | |
e4bc50be VD |
53 | * |
54 | * This structure manages per cpu exchanges in array of exchange pointers. | |
55 | * This array is allocated followed by struct fc_exch_pool memory for | |
56 | * assigned range of exchanges to per cpu pool. | |
57 | */ | |
58 | struct fc_exch_pool { | |
e17b4af7 VD |
59 | spinlock_t lock; |
60 | struct list_head ex_list; | |
3a3b42bf RL |
61 | u16 next_index; |
62 | u16 total_exches; | |
2034c19c | 63 | |
2034c19c HD |
64 | u16 left; |
65 | u16 right; | |
e17b4af7 | 66 | } ____cacheline_aligned_in_smp; |
e4bc50be | 67 | |
3a3b42bf RL |
68 | /** |
69 | * struct fc_exch_mgr - The Exchange Manager (EM). | |
70 | * @class: Default class for new sequences | |
71 | * @kref: Reference counter | |
72 | * @min_xid: Minimum exchange ID | |
73 | * @max_xid: Maximum exchange ID | |
74 | * @ep_pool: Reserved exchange pointers | |
75 | * @pool_max_index: Max exch array index in exch pool | |
76 | * @pool: Per cpu exch pool | |
74341d35 | 77 | * @lport: Local exchange port |
3a3b42bf | 78 | * @stats: Statistics structure |
42e9a92f RL |
79 | * |
80 | * This structure is the center for creating exchanges and sequences. | |
81 | * It manages the allocation of exchange IDs. | |
82 | */ | |
83 | struct fc_exch_mgr { | |
c6b21c93 | 84 | struct fc_exch_pool __percpu *pool; |
e17b4af7 | 85 | mempool_t *ep_pool; |
9ca1e182 | 86 | struct fc_lport *lport; |
3a3b42bf RL |
87 | enum fc_class class; |
88 | struct kref kref; | |
89 | u16 min_xid; | |
90 | u16 max_xid; | |
3a3b42bf | 91 | u16 pool_max_index; |
42e9a92f | 92 | |
42e9a92f RL |
93 | struct { |
94 | atomic_t no_free_exch; | |
95 | atomic_t no_free_exch_xid; | |
96 | atomic_t xid_not_found; | |
97 | atomic_t xid_busy; | |
98 | atomic_t seq_not_found; | |
99 | atomic_t non_bls_resp; | |
100 | } stats; | |
42e9a92f | 101 | }; |
42e9a92f | 102 | |
3a3b42bf RL |
103 | /** |
104 | * struct fc_exch_mgr_anchor - primary structure for list of EMs | |
105 | * @ema_list: Exchange Manager Anchor list | |
106 | * @mp: Exchange Manager associated with this anchor | |
107 | * @match: Routine to determine if this anchor's EM should be used | |
108 | * | |
109 | * When walking the list of anchors the match routine will be called | |
110 | * for each anchor to determine if that EM should be used. The last | |
111 | * anchor in the list will always match to handle any exchanges not | |
112 | * handled by other EMs. The non-default EMs would be added to the | |
1bd49b48 | 113 | * anchor list by HW that provides offloads. |
3a3b42bf | 114 | */ |
96316099 VD |
115 | struct fc_exch_mgr_anchor { |
116 | struct list_head ema_list; | |
117 | struct fc_exch_mgr *mp; | |
118 | bool (*match)(struct fc_frame *); | |
119 | }; | |
120 | ||
42e9a92f | 121 | static void fc_exch_rrq(struct fc_exch *); |
92261156 JE |
122 | static void fc_seq_ls_acc(struct fc_frame *); |
123 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, | |
42e9a92f | 124 | enum fc_els_rjt_explan); |
92261156 JE |
125 | static void fc_exch_els_rec(struct fc_frame *); |
126 | static void fc_exch_els_rrq(struct fc_frame *); | |
42e9a92f RL |
127 | |
128 | /* | |
129 | * Internal implementation notes. | |
130 | * | |
131 | * The exchange manager is one by default in libfc but LLD may choose | |
132 | * to have one per CPU. The sequence manager is one per exchange manager | |
133 | * and currently never separated. | |
134 | * | |
135 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field | |
136 | * assigned by the Sequence Initiator that shall be unique for a specific | |
137 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't | |
138 | * qualified by exchange ID, which one might think it would be. | |
139 | * In practice this limits the number of open sequences and exchanges to 256 | |
140 | * per session. For most targets we could treat this limit as per exchange. | |
141 | * | |
142 | * The exchange and its sequence are freed when the last sequence is received. | |
143 | * It's possible for the remote port to leave an exchange open without | |
144 | * sending any sequences. | |
145 | * | |
146 | * Notes on reference counts: | |
147 | * | |
148 | * Exchanges are reference counted and exchange gets freed when the reference | |
149 | * count becomes zero. | |
150 | * | |
151 | * Timeouts: | |
152 | * Sequences are timed out for E_D_TOV and R_A_TOV. | |
153 | * | |
154 | * Sequence event handling: | |
155 | * | |
156 | * The following events may occur on initiator sequences: | |
157 | * | |
158 | * Send. | |
159 | * For now, the whole thing is sent. | |
160 | * Receive ACK | |
161 | * This applies only to class F. | |
162 | * The sequence is marked complete. | |
163 | * ULP completion. | |
164 | * The upper layer calls fc_exch_done() when done | |
165 | * with exchange and sequence tuple. | |
166 | * RX-inferred completion. | |
167 | * When we receive the next sequence on the same exchange, we can | |
168 | * retire the previous sequence ID. (XXX not implemented). | |
169 | * Timeout. | |
170 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, | |
171 | * E_D_TOV causes abort and calls upper layer response handler | |
172 | * with FC_EX_TIMEOUT error. | |
173 | * Receive RJT | |
174 | * XXX defer. | |
175 | * Send ABTS | |
176 | * On timeout. | |
177 | * | |
178 | * The following events may occur on recipient sequences: | |
179 | * | |
180 | * Receive | |
181 | * Allocate sequence for first frame received. | |
182 | * Hold during receive handler. | |
183 | * Release when final frame received. | |
184 | * Keep status of last N of these for the ELS RES command. XXX TBD. | |
185 | * Receive ABTS | |
186 | * Deallocate sequence | |
187 | * Send RJT | |
188 | * Deallocate | |
189 | * | |
190 | * For now, we neglect conditions where only part of a sequence was | |
191 | * received or transmitted, or where out-of-order receipt is detected. | |
192 | */ | |
193 | ||
194 | /* | |
195 | * Locking notes: | |
196 | * | |
197 | * The EM code run in a per-CPU worker thread. | |
198 | * | |
199 | * To protect against concurrency between a worker thread code and timers, | |
200 | * sequence allocation and deallocation must be locked. | |
201 | * - exchange refcnt can be done atomicly without locks. | |
202 | * - sequence allocation must be locked by exch lock. | |
b2f0091f VD |
203 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
204 | * EM pool lock must be taken before the ex_lock. | |
42e9a92f RL |
205 | */ |
206 | ||
207 | /* | |
208 | * opcode names for debugging. | |
209 | */ | |
210 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; | |
211 | ||
3a3b42bf RL |
212 | /** |
213 | * fc_exch_name_lookup() - Lookup name by opcode | |
214 | * @op: Opcode to be looked up | |
215 | * @table: Opcode/name table | |
216 | * @max_index: Index not to be exceeded | |
217 | * | |
218 | * This routine is used to determine a human-readable string identifying | |
219 | * a R_CTL opcode. | |
220 | */ | |
42e9a92f RL |
221 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
222 | unsigned int max_index) | |
223 | { | |
224 | const char *name = NULL; | |
225 | ||
226 | if (op < max_index) | |
227 | name = table[op]; | |
228 | if (!name) | |
229 | name = "unknown"; | |
230 | return name; | |
231 | } | |
232 | ||
3a3b42bf RL |
233 | /** |
234 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() | |
235 | * @op: The opcode to be looked up | |
236 | */ | |
42e9a92f RL |
237 | static const char *fc_exch_rctl_name(unsigned int op) |
238 | { | |
239 | return fc_exch_name_lookup(op, fc_exch_rctl_names, | |
7156fffa | 240 | ARRAY_SIZE(fc_exch_rctl_names)); |
42e9a92f RL |
241 | } |
242 | ||
3a3b42bf RL |
243 | /** |
244 | * fc_exch_hold() - Increment an exchange's reference count | |
245 | * @ep: Echange to be held | |
42e9a92f | 246 | */ |
3a3b42bf | 247 | static inline void fc_exch_hold(struct fc_exch *ep) |
42e9a92f RL |
248 | { |
249 | atomic_inc(&ep->ex_refcnt); | |
250 | } | |
251 | ||
3a3b42bf RL |
252 | /** |
253 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields | |
254 | * and determine SOF and EOF. | |
255 | * @ep: The exchange to that will use the header | |
256 | * @fp: The frame whose header is to be modified | |
257 | * @f_ctl: F_CTL bits that will be used for the frame header | |
258 | * | |
259 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, | |
260 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. | |
42e9a92f RL |
261 | */ |
262 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, | |
263 | u32 f_ctl) | |
264 | { | |
265 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
266 | u16 fill; | |
267 | ||
268 | fr_sof(fp) = ep->class; | |
269 | if (ep->seq.cnt) | |
270 | fr_sof(fp) = fc_sof_normal(ep->class); | |
271 | ||
272 | if (f_ctl & FC_FC_END_SEQ) { | |
273 | fr_eof(fp) = FC_EOF_T; | |
3fb52041 | 274 | if (fc_sof_needs_ack((enum fc_sof)ep->class)) |
42e9a92f RL |
275 | fr_eof(fp) = FC_EOF_N; |
276 | /* | |
3a3b42bf | 277 | * From F_CTL. |
42e9a92f RL |
278 | * The number of fill bytes to make the length a 4-byte |
279 | * multiple is the low order 2-bits of the f_ctl. | |
280 | * The fill itself will have been cleared by the frame | |
281 | * allocation. | |
282 | * After this, the length will be even, as expected by | |
283 | * the transport. | |
284 | */ | |
285 | fill = fr_len(fp) & 3; | |
286 | if (fill) { | |
287 | fill = 4 - fill; | |
288 | /* TODO, this may be a problem with fragmented skb */ | |
289 | skb_put(fp_skb(fp), fill); | |
290 | hton24(fh->fh_f_ctl, f_ctl | fill); | |
291 | } | |
292 | } else { | |
293 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ | |
294 | fr_eof(fp) = FC_EOF_N; | |
295 | } | |
296 | ||
c1d45424 | 297 | /* Initialize remaining fh fields from fc_fill_fc_hdr */ |
42e9a92f RL |
298 | fh->fh_ox_id = htons(ep->oxid); |
299 | fh->fh_rx_id = htons(ep->rxid); | |
300 | fh->fh_seq_id = ep->seq.id; | |
301 | fh->fh_seq_cnt = htons(ep->seq.cnt); | |
302 | } | |
303 | ||
3a3b42bf RL |
304 | /** |
305 | * fc_exch_release() - Decrement an exchange's reference count | |
306 | * @ep: Exchange to be released | |
307 | * | |
308 | * If the reference count reaches zero and the exchange is complete, | |
309 | * it is freed. | |
42e9a92f RL |
310 | */ |
311 | static void fc_exch_release(struct fc_exch *ep) | |
312 | { | |
313 | struct fc_exch_mgr *mp; | |
314 | ||
315 | if (atomic_dec_and_test(&ep->ex_refcnt)) { | |
316 | mp = ep->em; | |
317 | if (ep->destructor) | |
318 | ep->destructor(&ep->seq, ep->arg); | |
aa6cd29b | 319 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
42e9a92f RL |
320 | mempool_free(ep, mp->ep_pool); |
321 | } | |
322 | } | |
323 | ||
b29a4f30 VD |
324 | /** |
325 | * fc_exch_timer_cancel() - cancel exch timer | |
326 | * @ep: The exchange whose timer to be canceled | |
327 | */ | |
4a80f083 | 328 | static inline void fc_exch_timer_cancel(struct fc_exch *ep) |
b29a4f30 VD |
329 | { |
330 | if (cancel_delayed_work(&ep->timeout_work)) { | |
331 | FC_EXCH_DBG(ep, "Exchange timer canceled\n"); | |
332 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ | |
333 | } | |
334 | } | |
335 | ||
336 | /** | |
337 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the | |
338 | * the exchange lock held | |
339 | * @ep: The exchange whose timer will start | |
340 | * @timer_msec: The timeout period | |
341 | * | |
342 | * Used for upper level protocols to time out the exchange. | |
343 | * The timer is cancelled when it fires or when the exchange completes. | |
344 | */ | |
345 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, | |
346 | unsigned int timer_msec) | |
347 | { | |
348 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
349 | return; | |
350 | ||
351 | FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec); | |
352 | ||
b8678865 BVA |
353 | fc_exch_hold(ep); /* hold for timer */ |
354 | if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, | |
57d3ec7e HR |
355 | msecs_to_jiffies(timer_msec))) { |
356 | FC_EXCH_DBG(ep, "Exchange already queued\n"); | |
b8678865 | 357 | fc_exch_release(ep); |
57d3ec7e | 358 | } |
b29a4f30 VD |
359 | } |
360 | ||
361 | /** | |
362 | * fc_exch_timer_set() - Lock the exchange and set the timer | |
363 | * @ep: The exchange whose timer will start | |
364 | * @timer_msec: The timeout period | |
365 | */ | |
366 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) | |
367 | { | |
368 | spin_lock_bh(&ep->ex_lock); | |
369 | fc_exch_timer_set_locked(ep, timer_msec); | |
370 | spin_unlock_bh(&ep->ex_lock); | |
371 | } | |
372 | ||
3a3b42bf RL |
373 | /** |
374 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held | |
375 | * @ep: The exchange that is complete | |
7030fd62 BVA |
376 | * |
377 | * Note: May sleep if invoked from outside a response handler. | |
3a3b42bf | 378 | */ |
42e9a92f RL |
379 | static int fc_exch_done_locked(struct fc_exch *ep) |
380 | { | |
381 | int rc = 1; | |
382 | ||
383 | /* | |
384 | * We must check for completion in case there are two threads | |
385 | * tyring to complete this. But the rrq code will reuse the | |
386 | * ep, and in that case we only clear the resp and set it as | |
387 | * complete, so it can be reused by the timer to send the rrq. | |
388 | */ | |
42e9a92f RL |
389 | if (ep->state & FC_EX_DONE) |
390 | return rc; | |
391 | ep->esb_stat |= ESB_ST_COMPLETE; | |
392 | ||
393 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { | |
394 | ep->state |= FC_EX_DONE; | |
b29a4f30 | 395 | fc_exch_timer_cancel(ep); |
42e9a92f RL |
396 | rc = 0; |
397 | } | |
398 | return rc; | |
399 | } | |
400 | ||
9ca1e182 HR |
401 | static struct fc_exch fc_quarantine_exch; |
402 | ||
3a3b42bf RL |
403 | /** |
404 | * fc_exch_ptr_get() - Return an exchange from an exchange pool | |
405 | * @pool: Exchange Pool to get an exchange from | |
406 | * @index: Index of the exchange within the pool | |
407 | * | |
408 | * Use the index to get an exchange from within an exchange pool. exches | |
409 | * will point to an array of exchange pointers. The index will select | |
410 | * the exchange within the array. | |
411 | */ | |
e4bc50be VD |
412 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
413 | u16 index) | |
414 | { | |
415 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); | |
416 | return exches[index]; | |
417 | } | |
418 | ||
3a3b42bf RL |
419 | /** |
420 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool | |
421 | * @pool: The pool to assign the exchange to | |
422 | * @index: The index in the pool where the exchange will be assigned | |
423 | * @ep: The exchange to assign to the pool | |
424 | */ | |
e4bc50be VD |
425 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, |
426 | struct fc_exch *ep) | |
427 | { | |
428 | ((struct fc_exch **)(pool + 1))[index] = ep; | |
429 | } | |
430 | ||
3a3b42bf RL |
431 | /** |
432 | * fc_exch_delete() - Delete an exchange | |
433 | * @ep: The exchange to be deleted | |
434 | */ | |
b2f0091f | 435 | static void fc_exch_delete(struct fc_exch *ep) |
42e9a92f | 436 | { |
b2f0091f | 437 | struct fc_exch_pool *pool; |
2034c19c | 438 | u16 index; |
42e9a92f | 439 | |
b2f0091f VD |
440 | pool = ep->pool; |
441 | spin_lock_bh(&pool->lock); | |
442 | WARN_ON(pool->total_exches <= 0); | |
443 | pool->total_exches--; | |
2034c19c HD |
444 | |
445 | /* update cache of free slot */ | |
446 | index = (ep->xid - ep->em->min_xid) >> fc_cpu_order; | |
9ca1e182 HR |
447 | if (!(ep->state & FC_EX_QUARANTINE)) { |
448 | if (pool->left == FC_XID_UNKNOWN) | |
449 | pool->left = index; | |
450 | else if (pool->right == FC_XID_UNKNOWN) | |
451 | pool->right = index; | |
452 | else | |
453 | pool->next_index = index; | |
454 | fc_exch_ptr_set(pool, index, NULL); | |
455 | } else { | |
456 | fc_exch_ptr_set(pool, index, &fc_quarantine_exch); | |
457 | } | |
42e9a92f | 458 | list_del(&ep->ex_list); |
b2f0091f | 459 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
460 | fc_exch_release(ep); /* drop hold for exch in mp */ |
461 | } | |
462 | ||
fb00cc23 | 463 | static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp, |
cae7b6dd | 464 | struct fc_frame *fp) |
1a7b75ae RL |
465 | { |
466 | struct fc_exch *ep; | |
467 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
cae7b6dd | 468 | int error = -ENXIO; |
3a3b42bf | 469 | u32 f_ctl; |
14fc315f | 470 | u8 fh_type = fh->fh_type; |
1a7b75ae RL |
471 | |
472 | ep = fc_seq_exch(sp); | |
cae7b6dd BVA |
473 | |
474 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) { | |
475 | fc_frame_free(fp); | |
476 | goto out; | |
477 | } | |
478 | ||
fb00cc23 | 479 | WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT)); |
1a7b75ae RL |
480 | |
481 | f_ctl = ntoh24(fh->fh_f_ctl); | |
482 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
f60e12e9 | 483 | fr_encaps(fp) = ep->encaps; |
1a7b75ae RL |
484 | |
485 | /* | |
486 | * update sequence count if this frame is carrying | |
487 | * multiple FC frames when sequence offload is enabled | |
488 | * by LLD. | |
489 | */ | |
490 | if (fr_max_payload(fp)) | |
491 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), | |
492 | fr_max_payload(fp)); | |
493 | else | |
494 | sp->cnt++; | |
495 | ||
496 | /* | |
497 | * Send the frame. | |
498 | */ | |
3a3b42bf | 499 | error = lport->tt.frame_send(lport, fp); |
1a7b75ae | 500 | |
14fc315f | 501 | if (fh_type == FC_TYPE_BLS) |
fb00cc23 | 502 | goto out; |
77a2b73a | 503 | |
1a7b75ae RL |
504 | /* |
505 | * Update the exchange and sequence flags, | |
506 | * assuming all frames for the sequence have been sent. | |
507 | * We can only be called to send once for each sequence. | |
508 | */ | |
1a7b75ae | 509 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ |
cc3593d3 | 510 | if (f_ctl & FC_FC_SEQ_INIT) |
1a7b75ae | 511 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
fb00cc23 NH |
512 | out: |
513 | return error; | |
514 | } | |
515 | ||
516 | /** | |
517 | * fc_seq_send() - Send a frame using existing sequence/exchange pair | |
518 | * @lport: The local port that the exchange will be sent on | |
519 | * @sp: The sequence to be sent | |
520 | * @fp: The frame to be sent on the exchange | |
cae7b6dd BVA |
521 | * |
522 | * Note: The frame will be freed either by a direct call to fc_frame_free(fp) | |
523 | * or indirectly by calling libfc_function_template.frame_send(). | |
fb00cc23 | 524 | */ |
0cac937d | 525 | int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp) |
fb00cc23 NH |
526 | { |
527 | struct fc_exch *ep; | |
528 | int error; | |
529 | ep = fc_seq_exch(sp); | |
530 | spin_lock_bh(&ep->ex_lock); | |
531 | error = fc_seq_send_locked(lport, sp, fp); | |
1a7b75ae RL |
532 | spin_unlock_bh(&ep->ex_lock); |
533 | return error; | |
534 | } | |
0cac937d | 535 | EXPORT_SYMBOL(fc_seq_send); |
1a7b75ae RL |
536 | |
537 | /** | |
3a3b42bf RL |
538 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
539 | * @ep: The exchange to allocate a new sequence for | |
540 | * @seq_id: The sequence ID to be used | |
1a7b75ae RL |
541 | * |
542 | * We don't support multiple originated sequences on the same exchange. | |
543 | * By implication, any previously originated sequence on this exchange | |
544 | * is complete, and we reallocate the same sequence. | |
545 | */ | |
546 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) | |
547 | { | |
548 | struct fc_seq *sp; | |
549 | ||
550 | sp = &ep->seq; | |
551 | sp->ssb_stat = 0; | |
552 | sp->cnt = 0; | |
553 | sp->id = seq_id; | |
554 | return sp; | |
555 | } | |
556 | ||
3a3b42bf RL |
557 | /** |
558 | * fc_seq_start_next_locked() - Allocate a new sequence on the same | |
559 | * exchange as the supplied sequence | |
560 | * @sp: The sequence/exchange to get a new sequence for | |
561 | */ | |
1a7b75ae RL |
562 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
563 | { | |
564 | struct fc_exch *ep = fc_seq_exch(sp); | |
565 | ||
566 | sp = fc_seq_alloc(ep, ep->seq_id++); | |
567 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", | |
568 | ep->f_ctl, sp->id); | |
569 | return sp; | |
570 | } | |
571 | ||
572 | /** | |
3a3b42bf RL |
573 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
574 | * for a given sequence/exchange pair | |
575 | * @sp: The sequence/exchange to get a new exchange for | |
1a7b75ae | 576 | */ |
c6865b30 | 577 | struct fc_seq *fc_seq_start_next(struct fc_seq *sp) |
1a7b75ae RL |
578 | { |
579 | struct fc_exch *ep = fc_seq_exch(sp); | |
580 | ||
581 | spin_lock_bh(&ep->ex_lock); | |
582 | sp = fc_seq_start_next_locked(sp); | |
583 | spin_unlock_bh(&ep->ex_lock); | |
584 | ||
585 | return sp; | |
586 | } | |
c6865b30 | 587 | EXPORT_SYMBOL(fc_seq_start_next); |
1a7b75ae | 588 | |
1a5c2d7e JE |
589 | /* |
590 | * Set the response handler for the exchange associated with a sequence. | |
7030fd62 BVA |
591 | * |
592 | * Note: May sleep if invoked from outside a response handler. | |
1a5c2d7e | 593 | */ |
f1d61e6e HR |
594 | void fc_seq_set_resp(struct fc_seq *sp, |
595 | void (*resp)(struct fc_seq *, struct fc_frame *, void *), | |
596 | void *arg) | |
1a5c2d7e JE |
597 | { |
598 | struct fc_exch *ep = fc_seq_exch(sp); | |
7030fd62 | 599 | DEFINE_WAIT(wait); |
1a5c2d7e JE |
600 | |
601 | spin_lock_bh(&ep->ex_lock); | |
7030fd62 BVA |
602 | while (ep->resp_active && ep->resp_task != current) { |
603 | prepare_to_wait(&ep->resp_wq, &wait, TASK_UNINTERRUPTIBLE); | |
604 | spin_unlock_bh(&ep->ex_lock); | |
605 | ||
606 | schedule(); | |
607 | ||
608 | spin_lock_bh(&ep->ex_lock); | |
609 | } | |
610 | finish_wait(&ep->resp_wq, &wait); | |
1a5c2d7e JE |
611 | ep->resp = resp; |
612 | ep->arg = arg; | |
613 | spin_unlock_bh(&ep->ex_lock); | |
614 | } | |
f1d61e6e | 615 | EXPORT_SYMBOL(fc_seq_set_resp); |
1a5c2d7e | 616 | |
1a7b75ae | 617 | /** |
77a2b73a VD |
618 | * fc_exch_abort_locked() - Abort an exchange |
619 | * @ep: The exchange to be aborted | |
3a3b42bf RL |
620 | * @timer_msec: The period of time to wait before aborting |
621 | * | |
0ebaed17 HR |
622 | * Abort an exchange and sequence. Generally called because of a |
623 | * exchange timeout or an abort from the upper layer. | |
624 | * | |
625 | * A timer_msec can be specified for abort timeout, if non-zero | |
626 | * timer_msec value is specified then exchange resp handler | |
627 | * will be called with timeout error if no response to abort. | |
628 | * | |
77a2b73a VD |
629 | * Locking notes: Called with exch lock held |
630 | * | |
631 | * Return value: 0 on success else error code | |
1a7b75ae | 632 | */ |
77a2b73a VD |
633 | static int fc_exch_abort_locked(struct fc_exch *ep, |
634 | unsigned int timer_msec) | |
42e9a92f RL |
635 | { |
636 | struct fc_seq *sp; | |
42e9a92f RL |
637 | struct fc_frame *fp; |
638 | int error; | |
639 | ||
57d3ec7e | 640 | FC_EXCH_DBG(ep, "exch: abort, time %d msecs\n", timer_msec); |
42e9a92f | 641 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || |
57d3ec7e HR |
642 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) { |
643 | FC_EXCH_DBG(ep, "exch: already completed esb %x state %x\n", | |
644 | ep->esb_stat, ep->state); | |
42e9a92f | 645 | return -ENXIO; |
57d3ec7e | 646 | } |
42e9a92f RL |
647 | |
648 | /* | |
649 | * Send the abort on a new sequence if possible. | |
650 | */ | |
651 | sp = fc_seq_start_next_locked(&ep->seq); | |
77a2b73a | 652 | if (!sp) |
42e9a92f | 653 | return -ENOMEM; |
42e9a92f | 654 | |
42e9a92f RL |
655 | if (timer_msec) |
656 | fc_exch_timer_set_locked(ep, timer_msec); | |
42e9a92f | 657 | |
cae7b6dd BVA |
658 | if (ep->sid) { |
659 | /* | |
660 | * Send an abort for the sequence that timed out. | |
661 | */ | |
662 | fp = fc_frame_alloc(ep->lp, 0); | |
663 | if (fp) { | |
664 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
665 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, | |
666 | FC_TYPE_BLS, FC_FC_END_SEQ | | |
667 | FC_FC_SEQ_INIT, 0); | |
668 | error = fc_seq_send_locked(ep->lp, sp, fp); | |
669 | } else { | |
670 | error = -ENOBUFS; | |
671 | } | |
672 | } else { | |
673 | /* | |
674 | * If not logged into the fabric, don't send ABTS but leave | |
675 | * sequence active until next timeout. | |
676 | */ | |
677 | error = 0; | |
678 | } | |
679 | ep->esb_stat |= ESB_ST_ABNORMAL; | |
42e9a92f RL |
680 | return error; |
681 | } | |
42e9a92f | 682 | |
77a2b73a VD |
683 | /** |
684 | * fc_seq_exch_abort() - Abort an exchange and sequence | |
685 | * @req_sp: The sequence to be aborted | |
686 | * @timer_msec: The period of time to wait before aborting | |
687 | * | |
688 | * Generally called because of a timeout or an abort from the upper layer. | |
689 | * | |
690 | * Return value: 0 on success else error code | |
691 | */ | |
0ebaed17 | 692 | int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec) |
77a2b73a VD |
693 | { |
694 | struct fc_exch *ep; | |
695 | int error; | |
696 | ||
697 | ep = fc_seq_exch(req_sp); | |
698 | spin_lock_bh(&ep->ex_lock); | |
699 | error = fc_exch_abort_locked(ep, timer_msec); | |
700 | spin_unlock_bh(&ep->ex_lock); | |
701 | return error; | |
702 | } | |
703 | ||
7030fd62 BVA |
704 | /** |
705 | * fc_invoke_resp() - invoke ep->resp() | |
74341d35 LJ |
706 | * @ep: The exchange to be operated on |
707 | * @fp: The frame pointer to pass through to ->resp() | |
708 | * @sp: The sequence pointer to pass through to ->resp() | |
7030fd62 BVA |
709 | * |
710 | * Notes: | |
711 | * It is assumed that after initialization finished (this means the | |
712 | * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are | |
713 | * modified only via fc_seq_set_resp(). This guarantees that none of these | |
714 | * two variables changes if ep->resp_active > 0. | |
715 | * | |
716 | * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when | |
717 | * this function is invoked, the first spin_lock_bh() call in this function | |
718 | * will wait until fc_seq_set_resp() has finished modifying these variables. | |
719 | * | |
720 | * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that | |
721 | * ep->resp() won't be invoked after fc_exch_done() has returned. | |
722 | * | |
723 | * The response handler itself may invoke fc_exch_done(), which will clear the | |
724 | * ep->resp pointer. | |
725 | * | |
726 | * Return value: | |
727 | * Returns true if and only if ep->resp has been invoked. | |
728 | */ | |
729 | static bool fc_invoke_resp(struct fc_exch *ep, struct fc_seq *sp, | |
730 | struct fc_frame *fp) | |
731 | { | |
732 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); | |
733 | void *arg; | |
734 | bool res = false; | |
735 | ||
736 | spin_lock_bh(&ep->ex_lock); | |
737 | ep->resp_active++; | |
738 | if (ep->resp_task != current) | |
739 | ep->resp_task = !ep->resp_task ? current : NULL; | |
740 | resp = ep->resp; | |
741 | arg = ep->arg; | |
742 | spin_unlock_bh(&ep->ex_lock); | |
743 | ||
744 | if (resp) { | |
745 | resp(sp, fp, arg); | |
746 | res = true; | |
7030fd62 BVA |
747 | } |
748 | ||
749 | spin_lock_bh(&ep->ex_lock); | |
750 | if (--ep->resp_active == 0) | |
751 | ep->resp_task = NULL; | |
752 | spin_unlock_bh(&ep->ex_lock); | |
753 | ||
754 | if (ep->resp_active == 0) | |
755 | wake_up(&ep->resp_wq); | |
756 | ||
757 | return res; | |
758 | } | |
759 | ||
3a3b42bf RL |
760 | /** |
761 | * fc_exch_timeout() - Handle exchange timer expiration | |
762 | * @work: The work_struct identifying the exchange that timed out | |
42e9a92f RL |
763 | */ |
764 | static void fc_exch_timeout(struct work_struct *work) | |
765 | { | |
766 | struct fc_exch *ep = container_of(work, struct fc_exch, | |
767 | timeout_work.work); | |
768 | struct fc_seq *sp = &ep->seq; | |
42e9a92f RL |
769 | u32 e_stat; |
770 | int rc = 1; | |
771 | ||
57d3ec7e | 772 | FC_EXCH_DBG(ep, "Exchange timed out state %x\n", ep->state); |
cd305ce4 | 773 | |
42e9a92f RL |
774 | spin_lock_bh(&ep->ex_lock); |
775 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) | |
776 | goto unlock; | |
777 | ||
778 | e_stat = ep->esb_stat; | |
779 | if (e_stat & ESB_ST_COMPLETE) { | |
780 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; | |
a0cc1ecc | 781 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
782 | if (e_stat & ESB_ST_REC_QUAL) |
783 | fc_exch_rrq(ep); | |
42e9a92f RL |
784 | goto done; |
785 | } else { | |
42e9a92f RL |
786 | if (e_stat & ESB_ST_ABNORMAL) |
787 | rc = fc_exch_done_locked(ep); | |
788 | spin_unlock_bh(&ep->ex_lock); | |
f3162483 PN |
789 | if (!rc) |
790 | fc_exch_delete(ep); | |
7030fd62 BVA |
791 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_TIMEOUT)); |
792 | fc_seq_set_resp(sp, NULL, ep->arg); | |
42e9a92f RL |
793 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); |
794 | goto done; | |
795 | } | |
796 | unlock: | |
797 | spin_unlock_bh(&ep->ex_lock); | |
798 | done: | |
799 | /* | |
800 | * This release matches the hold taken when the timer was set. | |
801 | */ | |
802 | fc_exch_release(ep); | |
803 | } | |
804 | ||
52ff878c | 805 | /** |
3a3b42bf RL |
806 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
807 | * @lport: The local port that the exchange is for | |
808 | * @mp: The exchange manager that will allocate the exchange | |
42e9a92f | 809 | * |
d7179680 | 810 | * Returns pointer to allocated fc_exch with exch lock held. |
42e9a92f | 811 | */ |
52ff878c | 812 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
d7179680 | 813 | struct fc_exch_mgr *mp) |
42e9a92f RL |
814 | { |
815 | struct fc_exch *ep; | |
b2f0091f VD |
816 | unsigned int cpu; |
817 | u16 index; | |
818 | struct fc_exch_pool *pool; | |
42e9a92f RL |
819 | |
820 | /* allocate memory for exchange */ | |
821 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); | |
822 | if (!ep) { | |
823 | atomic_inc(&mp->stats.no_free_exch); | |
824 | goto out; | |
825 | } | |
826 | memset(ep, 0, sizeof(*ep)); | |
827 | ||
f018b73a | 828 | cpu = get_cpu(); |
b2f0091f VD |
829 | pool = per_cpu_ptr(mp->pool, cpu); |
830 | spin_lock_bh(&pool->lock); | |
f018b73a | 831 | put_cpu(); |
2034c19c HD |
832 | |
833 | /* peek cache of free slot */ | |
834 | if (pool->left != FC_XID_UNKNOWN) { | |
b73aa56e HR |
835 | if (!WARN_ON(fc_exch_ptr_get(pool, pool->left))) { |
836 | index = pool->left; | |
837 | pool->left = FC_XID_UNKNOWN; | |
838 | goto hit; | |
839 | } | |
2034c19c HD |
840 | } |
841 | if (pool->right != FC_XID_UNKNOWN) { | |
b73aa56e HR |
842 | if (!WARN_ON(fc_exch_ptr_get(pool, pool->right))) { |
843 | index = pool->right; | |
844 | pool->right = FC_XID_UNKNOWN; | |
845 | goto hit; | |
846 | } | |
2034c19c HD |
847 | } |
848 | ||
b2f0091f VD |
849 | index = pool->next_index; |
850 | /* allocate new exch from pool */ | |
851 | while (fc_exch_ptr_get(pool, index)) { | |
852 | index = index == mp->pool_max_index ? 0 : index + 1; | |
853 | if (index == pool->next_index) | |
42e9a92f | 854 | goto err; |
42e9a92f | 855 | } |
b2f0091f | 856 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
2034c19c | 857 | hit: |
42e9a92f RL |
858 | fc_exch_hold(ep); /* hold for exch in mp */ |
859 | spin_lock_init(&ep->ex_lock); | |
860 | /* | |
861 | * Hold exch lock for caller to prevent fc_exch_reset() | |
862 | * from releasing exch while fc_exch_alloc() caller is | |
863 | * still working on exch. | |
864 | */ | |
865 | spin_lock_bh(&ep->ex_lock); | |
866 | ||
b2f0091f VD |
867 | fc_exch_ptr_set(pool, index, ep); |
868 | list_add_tail(&ep->ex_list, &pool->ex_list); | |
42e9a92f | 869 | fc_seq_alloc(ep, ep->seq_id++); |
b2f0091f VD |
870 | pool->total_exches++; |
871 | spin_unlock_bh(&pool->lock); | |
42e9a92f RL |
872 | |
873 | /* | |
874 | * update exchange | |
875 | */ | |
b2f0091f | 876 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
42e9a92f | 877 | ep->em = mp; |
b2f0091f | 878 | ep->pool = pool; |
52ff878c | 879 | ep->lp = lport; |
42e9a92f RL |
880 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
881 | ep->rxid = FC_XID_UNKNOWN; | |
882 | ep->class = mp->class; | |
7030fd62 BVA |
883 | ep->resp_active = 0; |
884 | init_waitqueue_head(&ep->resp_wq); | |
42e9a92f RL |
885 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); |
886 | out: | |
887 | return ep; | |
888 | err: | |
b2f0091f | 889 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
890 | atomic_inc(&mp->stats.no_free_exch_xid); |
891 | mempool_free(ep, mp->ep_pool); | |
892 | return NULL; | |
893 | } | |
52ff878c VD |
894 | |
895 | /** | |
3a3b42bf RL |
896 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
897 | * local port's list of EMs. | |
898 | * @lport: The local port that will own the exchange | |
899 | * @fp: The FC frame that the exchange will be for | |
52ff878c | 900 | * |
3a3b42bf RL |
901 | * This function walks the list of exchange manager(EM) |
902 | * anchors to select an EM for a new exchange allocation. The | |
903 | * EM is selected when a NULL match function pointer is encountered | |
904 | * or when a call to a match function returns true. | |
52ff878c | 905 | */ |
f8f91f3f MP |
906 | static struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
907 | struct fc_frame *fp) | |
52ff878c VD |
908 | { |
909 | struct fc_exch_mgr_anchor *ema; | |
f8f91f3f | 910 | struct fc_exch *ep; |
52ff878c | 911 | |
f8f91f3f MP |
912 | list_for_each_entry(ema, &lport->ema_list, ema_list) { |
913 | if (!ema->match || ema->match(fp)) { | |
914 | ep = fc_exch_em_alloc(lport, ema->mp); | |
915 | if (ep) | |
916 | return ep; | |
917 | } | |
918 | } | |
52ff878c VD |
919 | return NULL; |
920 | } | |
42e9a92f | 921 | |
3a3b42bf RL |
922 | /** |
923 | * fc_exch_find() - Lookup and hold an exchange | |
924 | * @mp: The exchange manager to lookup the exchange from | |
925 | * @xid: The XID of the exchange to look up | |
42e9a92f RL |
926 | */ |
927 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) | |
928 | { | |
9ca1e182 | 929 | struct fc_lport *lport = mp->lport; |
b2f0091f | 930 | struct fc_exch_pool *pool; |
42e9a92f | 931 | struct fc_exch *ep = NULL; |
fa068832 CL |
932 | u16 cpu = xid & fc_cpu_mask; |
933 | ||
d5c3eb26 CL |
934 | if (xid == FC_XID_UNKNOWN) |
935 | return NULL; | |
936 | ||
fa068832 | 937 | if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) { |
9ca1e182 HR |
938 | pr_err("host%u: lport %6.6x: xid %d invalid CPU %d\n:", |
939 | lport->host->host_no, lport->port_id, xid, cpu); | |
fa068832 CL |
940 | return NULL; |
941 | } | |
42e9a92f RL |
942 | |
943 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { | |
fa068832 | 944 | pool = per_cpu_ptr(mp->pool, cpu); |
b2f0091f VD |
945 | spin_lock_bh(&pool->lock); |
946 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); | |
9ca1e182 HR |
947 | if (ep == &fc_quarantine_exch) { |
948 | FC_LPORT_DBG(lport, "xid %x quarantined\n", xid); | |
949 | ep = NULL; | |
950 | } | |
8d080236 BVA |
951 | if (ep) { |
952 | WARN_ON(ep->xid != xid); | |
42e9a92f | 953 | fc_exch_hold(ep); |
8d080236 | 954 | } |
b2f0091f | 955 | spin_unlock_bh(&pool->lock); |
42e9a92f RL |
956 | } |
957 | return ep; | |
958 | } | |
959 | ||
1a7b75ae RL |
960 | |
961 | /** | |
962 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and | |
3a3b42bf RL |
963 | * the memory allocated for the related objects may be freed. |
964 | * @sp: The sequence that has completed | |
7030fd62 BVA |
965 | * |
966 | * Note: May sleep if invoked from outside a response handler. | |
1a7b75ae | 967 | */ |
768c72cc | 968 | void fc_exch_done(struct fc_seq *sp) |
42e9a92f RL |
969 | { |
970 | struct fc_exch *ep = fc_seq_exch(sp); | |
971 | int rc; | |
972 | ||
973 | spin_lock_bh(&ep->ex_lock); | |
974 | rc = fc_exch_done_locked(ep); | |
975 | spin_unlock_bh(&ep->ex_lock); | |
7030fd62 BVA |
976 | |
977 | fc_seq_set_resp(sp, NULL, ep->arg); | |
42e9a92f | 978 | if (!rc) |
b2f0091f | 979 | fc_exch_delete(ep); |
42e9a92f | 980 | } |
768c72cc | 981 | EXPORT_SYMBOL(fc_exch_done); |
42e9a92f | 982 | |
3a3b42bf RL |
983 | /** |
984 | * fc_exch_resp() - Allocate a new exchange for a response frame | |
985 | * @lport: The local port that the exchange was for | |
986 | * @mp: The exchange manager to allocate the exchange from | |
987 | * @fp: The response frame | |
988 | * | |
42e9a92f RL |
989 | * Sets the responder ID in the frame header. |
990 | */ | |
52ff878c VD |
991 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
992 | struct fc_exch_mgr *mp, | |
993 | struct fc_frame *fp) | |
42e9a92f RL |
994 | { |
995 | struct fc_exch *ep; | |
996 | struct fc_frame_header *fh; | |
42e9a92f | 997 | |
52ff878c | 998 | ep = fc_exch_alloc(lport, fp); |
42e9a92f RL |
999 | if (ep) { |
1000 | ep->class = fc_frame_class(fp); | |
1001 | ||
1002 | /* | |
1003 | * Set EX_CTX indicating we're responding on this exchange. | |
1004 | */ | |
1005 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ | |
1006 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ | |
1007 | fh = fc_frame_header_get(fp); | |
1008 | ep->sid = ntoh24(fh->fh_d_id); | |
1009 | ep->did = ntoh24(fh->fh_s_id); | |
1010 | ep->oid = ep->did; | |
1011 | ||
1012 | /* | |
1013 | * Allocated exchange has placed the XID in the | |
1014 | * originator field. Move it to the responder field, | |
1015 | * and set the originator XID from the frame. | |
1016 | */ | |
1017 | ep->rxid = ep->xid; | |
1018 | ep->oxid = ntohs(fh->fh_ox_id); | |
1019 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; | |
1020 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) | |
1021 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
1022 | ||
42e9a92f | 1023 | fc_exch_hold(ep); /* hold for caller */ |
52ff878c | 1024 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
42e9a92f RL |
1025 | } |
1026 | return ep; | |
1027 | } | |
1028 | ||
3a3b42bf RL |
1029 | /** |
1030 | * fc_seq_lookup_recip() - Find a sequence where the other end | |
1031 | * originated the sequence | |
1032 | * @lport: The local port that the frame was sent to | |
1033 | * @mp: The Exchange Manager to lookup the exchange from | |
1034 | * @fp: The frame associated with the sequence we're looking for | |
1035 | * | |
42e9a92f RL |
1036 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
1037 | * on the ep that should be released by the caller. | |
1038 | */ | |
52ff878c VD |
1039 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
1040 | struct fc_exch_mgr *mp, | |
b2ab99c9 | 1041 | struct fc_frame *fp) |
42e9a92f RL |
1042 | { |
1043 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1044 | struct fc_exch *ep = NULL; | |
1045 | struct fc_seq *sp = NULL; | |
1046 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; | |
1047 | u32 f_ctl; | |
1048 | u16 xid; | |
1049 | ||
1050 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1051 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); | |
1052 | ||
1053 | /* | |
1054 | * Lookup or create the exchange if we will be creating the sequence. | |
1055 | */ | |
1056 | if (f_ctl & FC_FC_EX_CTX) { | |
1057 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ | |
1058 | ep = fc_exch_find(mp, xid); | |
1059 | if (!ep) { | |
1060 | atomic_inc(&mp->stats.xid_not_found); | |
1061 | reject = FC_RJT_OX_ID; | |
1062 | goto out; | |
1063 | } | |
1064 | if (ep->rxid == FC_XID_UNKNOWN) | |
1065 | ep->rxid = ntohs(fh->fh_rx_id); | |
1066 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { | |
1067 | reject = FC_RJT_OX_ID; | |
1068 | goto rel; | |
1069 | } | |
1070 | } else { | |
1071 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ | |
1072 | ||
1073 | /* | |
1074 | * Special case for MDS issuing an ELS TEST with a | |
1075 | * bad rxid of 0. | |
1076 | * XXX take this out once we do the proper reject. | |
1077 | */ | |
1078 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && | |
1079 | fc_frame_payload_op(fp) == ELS_TEST) { | |
1080 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); | |
1081 | xid = FC_XID_UNKNOWN; | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * new sequence - find the exchange | |
1086 | */ | |
1087 | ep = fc_exch_find(mp, xid); | |
1088 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { | |
1089 | if (ep) { | |
1090 | atomic_inc(&mp->stats.xid_busy); | |
1091 | reject = FC_RJT_RX_ID; | |
1092 | goto rel; | |
1093 | } | |
52ff878c | 1094 | ep = fc_exch_resp(lport, mp, fp); |
42e9a92f RL |
1095 | if (!ep) { |
1096 | reject = FC_RJT_EXCH_EST; /* XXX */ | |
1097 | goto out; | |
1098 | } | |
1099 | xid = ep->xid; /* get our XID */ | |
1100 | } else if (!ep) { | |
1101 | atomic_inc(&mp->stats.xid_not_found); | |
1102 | reject = FC_RJT_RX_ID; /* XID not found */ | |
1103 | goto out; | |
1104 | } | |
1105 | } | |
1106 | ||
5d73bea2 | 1107 | spin_lock_bh(&ep->ex_lock); |
42e9a92f RL |
1108 | /* |
1109 | * At this point, we have the exchange held. | |
1110 | * Find or create the sequence. | |
1111 | */ | |
1112 | if (fc_sof_is_init(fr_sof(fp))) { | |
a104c844 | 1113 | sp = &ep->seq; |
42e9a92f | 1114 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 | 1115 | sp->id = fh->fh_seq_id; |
42e9a92f RL |
1116 | } else { |
1117 | sp = &ep->seq; | |
1118 | if (sp->id != fh->fh_seq_id) { | |
1119 | atomic_inc(&mp->stats.seq_not_found); | |
e3e65c69 KP |
1120 | if (f_ctl & FC_FC_END_SEQ) { |
1121 | /* | |
1122 | * Update sequence_id based on incoming last | |
1123 | * frame of sequence exchange. This is needed | |
1bd49b48 | 1124 | * for FC target where DDP has been used |
e3e65c69 KP |
1125 | * on target where, stack is indicated only |
1126 | * about last frame's (payload _header) header. | |
1127 | * Whereas "seq_id" which is part of | |
1128 | * frame_header is allocated by initiator | |
1129 | * which is totally different from "seq_id" | |
1130 | * allocated when XFER_RDY was sent by target. | |
1131 | * To avoid false -ve which results into not | |
1132 | * sending RSP, hence write request on other | |
1133 | * end never finishes. | |
1134 | */ | |
e3e65c69 KP |
1135 | sp->ssb_stat |= SSB_ST_RESP; |
1136 | sp->id = fh->fh_seq_id; | |
e3e65c69 | 1137 | } else { |
5d73bea2 BVA |
1138 | spin_unlock_bh(&ep->ex_lock); |
1139 | ||
e3e65c69 KP |
1140 | /* sequence/exch should exist */ |
1141 | reject = FC_RJT_SEQ_ID; | |
1142 | goto rel; | |
1143 | } | |
42e9a92f RL |
1144 | } |
1145 | } | |
1146 | WARN_ON(ep != fc_seq_exch(sp)); | |
1147 | ||
1148 | if (f_ctl & FC_FC_SEQ_INIT) | |
1149 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
5d73bea2 | 1150 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
1151 | |
1152 | fr_seq(fp) = sp; | |
1153 | out: | |
1154 | return reject; | |
1155 | rel: | |
1156 | fc_exch_done(&ep->seq); | |
1157 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ | |
1158 | return reject; | |
1159 | } | |
1160 | ||
3a3b42bf RL |
1161 | /** |
1162 | * fc_seq_lookup_orig() - Find a sequence where this end | |
1163 | * originated the sequence | |
1164 | * @mp: The Exchange Manager to lookup the exchange from | |
1165 | * @fp: The frame associated with the sequence we're looking for | |
1166 | * | |
42e9a92f RL |
1167 | * Does not hold the sequence for the caller. |
1168 | */ | |
1169 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, | |
1170 | struct fc_frame *fp) | |
1171 | { | |
1172 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1173 | struct fc_exch *ep; | |
1174 | struct fc_seq *sp = NULL; | |
1175 | u32 f_ctl; | |
1176 | u16 xid; | |
1177 | ||
1178 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1179 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); | |
1180 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); | |
1181 | ep = fc_exch_find(mp, xid); | |
1182 | if (!ep) | |
1183 | return NULL; | |
1184 | if (ep->seq.id == fh->fh_seq_id) { | |
1185 | /* | |
1186 | * Save the RX_ID if we didn't previously know it. | |
1187 | */ | |
1188 | sp = &ep->seq; | |
1189 | if ((f_ctl & FC_FC_EX_CTX) != 0 && | |
1190 | ep->rxid == FC_XID_UNKNOWN) { | |
1191 | ep->rxid = ntohs(fh->fh_rx_id); | |
1192 | } | |
1193 | } | |
1194 | fc_exch_release(ep); | |
1195 | return sp; | |
1196 | } | |
1197 | ||
3a3b42bf RL |
1198 | /** |
1199 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange | |
1200 | * @ep: The exchange to set the addresses for | |
1201 | * @orig_id: The originator's ID | |
1202 | * @resp_id: The responder's ID | |
1203 | * | |
42e9a92f RL |
1204 | * Note this must be done before the first sequence of the exchange is sent. |
1205 | */ | |
1206 | static void fc_exch_set_addr(struct fc_exch *ep, | |
1207 | u32 orig_id, u32 resp_id) | |
1208 | { | |
1209 | ep->oid = orig_id; | |
1210 | if (ep->esb_stat & ESB_ST_RESP) { | |
1211 | ep->sid = resp_id; | |
1212 | ep->did = orig_id; | |
1213 | } else { | |
1214 | ep->sid = orig_id; | |
1215 | ep->did = resp_id; | |
1216 | } | |
1217 | } | |
1218 | ||
1a7b75ae | 1219 | /** |
25985edc | 1220 | * fc_seq_els_rsp_send() - Send an ELS response using information from |
3a3b42bf | 1221 | * the existing sequence/exchange. |
92261156 | 1222 | * @fp: The received frame |
3a3b42bf RL |
1223 | * @els_cmd: The ELS command to be sent |
1224 | * @els_data: The ELS data to be sent | |
92261156 JE |
1225 | * |
1226 | * The received frame is not freed. | |
42e9a92f | 1227 | */ |
7ab24dd1 HR |
1228 | void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, |
1229 | struct fc_seq_els_data *els_data) | |
42e9a92f RL |
1230 | { |
1231 | switch (els_cmd) { | |
1232 | case ELS_LS_RJT: | |
92261156 | 1233 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); |
42e9a92f RL |
1234 | break; |
1235 | case ELS_LS_ACC: | |
92261156 | 1236 | fc_seq_ls_acc(fp); |
42e9a92f RL |
1237 | break; |
1238 | case ELS_RRQ: | |
92261156 | 1239 | fc_exch_els_rrq(fp); |
42e9a92f RL |
1240 | break; |
1241 | case ELS_REC: | |
92261156 | 1242 | fc_exch_els_rec(fp); |
42e9a92f RL |
1243 | break; |
1244 | default: | |
92261156 | 1245 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); |
42e9a92f RL |
1246 | } |
1247 | } | |
7ab24dd1 | 1248 | EXPORT_SYMBOL_GPL(fc_seq_els_rsp_send); |
42e9a92f | 1249 | |
3a3b42bf RL |
1250 | /** |
1251 | * fc_seq_send_last() - Send a sequence that is the last in the exchange | |
1252 | * @sp: The sequence that is to be sent | |
1253 | * @fp: The frame that will be sent on the sequence | |
1254 | * @rctl: The R_CTL information to be sent | |
1255 | * @fh_type: The frame header type | |
42e9a92f RL |
1256 | */ |
1257 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, | |
1258 | enum fc_rctl rctl, enum fc_fh_type fh_type) | |
1259 | { | |
1260 | u32 f_ctl; | |
1261 | struct fc_exch *ep = fc_seq_exch(sp); | |
1262 | ||
1263 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1264 | f_ctl |= ep->f_ctl; | |
1265 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); | |
fb00cc23 | 1266 | fc_seq_send_locked(ep->lp, sp, fp); |
42e9a92f RL |
1267 | } |
1268 | ||
3a3b42bf RL |
1269 | /** |
1270 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame | |
1271 | * @sp: The sequence to send the ACK on | |
1272 | * @rx_fp: The received frame that is being acknoledged | |
1273 | * | |
42e9a92f | 1274 | * Send ACK_1 (or equiv.) indicating we received something. |
42e9a92f RL |
1275 | */ |
1276 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) | |
1277 | { | |
1278 | struct fc_frame *fp; | |
1279 | struct fc_frame_header *rx_fh; | |
1280 | struct fc_frame_header *fh; | |
1281 | struct fc_exch *ep = fc_seq_exch(sp); | |
3a3b42bf | 1282 | struct fc_lport *lport = ep->lp; |
42e9a92f RL |
1283 | unsigned int f_ctl; |
1284 | ||
1285 | /* | |
1286 | * Don't send ACKs for class 3. | |
1287 | */ | |
1288 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { | |
3a3b42bf | 1289 | fp = fc_frame_alloc(lport, 0); |
57d3ec7e HR |
1290 | if (!fp) { |
1291 | FC_EXCH_DBG(ep, "Drop ACK request, out of memory\n"); | |
42e9a92f | 1292 | return; |
57d3ec7e | 1293 | } |
42e9a92f RL |
1294 | |
1295 | fh = fc_frame_header_get(fp); | |
1296 | fh->fh_r_ctl = FC_RCTL_ACK_1; | |
1297 | fh->fh_type = FC_TYPE_BLS; | |
1298 | ||
1299 | /* | |
1300 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1301 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1302 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1303 | * Last ACK uses bits 7-6 (continue sequence), | |
1304 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1305 | */ | |
1306 | rx_fh = fc_frame_header_get(rx_fp); | |
1307 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1308 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1309 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | | |
1310 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1311 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1312 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1313 | hton24(fh->fh_f_ctl, f_ctl); | |
1314 | ||
1315 | fc_exch_setup_hdr(ep, fp, f_ctl); | |
1316 | fh->fh_seq_id = rx_fh->fh_seq_id; | |
1317 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; | |
1318 | fh->fh_parm_offset = htonl(1); /* ack single frame */ | |
1319 | ||
1320 | fr_sof(fp) = fr_sof(rx_fp); | |
1321 | if (f_ctl & FC_FC_END_SEQ) | |
1322 | fr_eof(fp) = FC_EOF_T; | |
1323 | else | |
1324 | fr_eof(fp) = FC_EOF_N; | |
1325 | ||
3a3b42bf | 1326 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1327 | } |
1328 | } | |
1329 | ||
3a3b42bf RL |
1330 | /** |
1331 | * fc_exch_send_ba_rjt() - Send BLS Reject | |
1332 | * @rx_fp: The frame being rejected | |
1333 | * @reason: The reason the frame is being rejected | |
25985edc | 1334 | * @explan: The explanation for the rejection |
3a3b42bf | 1335 | * |
42e9a92f RL |
1336 | * This is for rejecting BA_ABTS only. |
1337 | */ | |
b2ab99c9 RL |
1338 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
1339 | enum fc_ba_rjt_reason reason, | |
1340 | enum fc_ba_rjt_explan explan) | |
42e9a92f RL |
1341 | { |
1342 | struct fc_frame *fp; | |
1343 | struct fc_frame_header *rx_fh; | |
1344 | struct fc_frame_header *fh; | |
1345 | struct fc_ba_rjt *rp; | |
57d3ec7e | 1346 | struct fc_seq *sp; |
3a3b42bf | 1347 | struct fc_lport *lport; |
42e9a92f RL |
1348 | unsigned int f_ctl; |
1349 | ||
3a3b42bf | 1350 | lport = fr_dev(rx_fp); |
57d3ec7e | 1351 | sp = fr_seq(rx_fp); |
3a3b42bf | 1352 | fp = fc_frame_alloc(lport, sizeof(*rp)); |
57d3ec7e HR |
1353 | if (!fp) { |
1354 | FC_EXCH_DBG(fc_seq_exch(sp), | |
1355 | "Drop BA_RJT request, out of memory\n"); | |
42e9a92f | 1356 | return; |
57d3ec7e | 1357 | } |
42e9a92f RL |
1358 | fh = fc_frame_header_get(fp); |
1359 | rx_fh = fc_frame_header_get(rx_fp); | |
1360 | ||
1361 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); | |
1362 | ||
1363 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
1364 | rp->br_reason = reason; | |
1365 | rp->br_explan = explan; | |
1366 | ||
1367 | /* | |
1368 | * seq_id, cs_ctl, df_ctl and param/offset are zero. | |
1369 | */ | |
1370 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); | |
1371 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); | |
1d490ce3 JE |
1372 | fh->fh_ox_id = rx_fh->fh_ox_id; |
1373 | fh->fh_rx_id = rx_fh->fh_rx_id; | |
42e9a92f RL |
1374 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
1375 | fh->fh_r_ctl = FC_RCTL_BA_RJT; | |
1376 | fh->fh_type = FC_TYPE_BLS; | |
1377 | ||
1378 | /* | |
1379 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). | |
1380 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. | |
1381 | * Bits 9-8 are meaningful (retransmitted or unidirectional). | |
1382 | * Last ACK uses bits 7-6 (continue sequence), | |
1383 | * bits 5-4 are meaningful (what kind of ACK to use). | |
1384 | * Always set LAST_SEQ, END_SEQ. | |
1385 | */ | |
1386 | f_ctl = ntoh24(rx_fh->fh_f_ctl); | |
1387 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | | |
1388 | FC_FC_END_CONN | FC_FC_SEQ_INIT | | |
1389 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; | |
1390 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; | |
1391 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1392 | f_ctl &= ~FC_FC_FIRST_SEQ; | |
1393 | hton24(fh->fh_f_ctl, f_ctl); | |
1394 | ||
1395 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); | |
1396 | fr_eof(fp) = FC_EOF_T; | |
1397 | if (fc_sof_needs_ack(fr_sof(fp))) | |
1398 | fr_eof(fp) = FC_EOF_N; | |
1399 | ||
3a3b42bf | 1400 | lport->tt.frame_send(lport, fp); |
42e9a92f RL |
1401 | } |
1402 | ||
3a3b42bf RL |
1403 | /** |
1404 | * fc_exch_recv_abts() - Handle an incoming ABTS | |
1405 | * @ep: The exchange the abort was on | |
1406 | * @rx_fp: The ABTS frame | |
1407 | * | |
1408 | * This would be for target mode usually, but could be due to lost | |
1409 | * FCP transfer ready, confirm or RRQ. We always handle this as an | |
1410 | * exchange abort, ignoring the parameter. | |
42e9a92f RL |
1411 | */ |
1412 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) | |
1413 | { | |
1414 | struct fc_frame *fp; | |
1415 | struct fc_ba_acc *ap; | |
1416 | struct fc_frame_header *fh; | |
1417 | struct fc_seq *sp; | |
1418 | ||
1419 | if (!ep) | |
1420 | goto reject; | |
f95b35cf | 1421 | |
57d3ec7e | 1422 | FC_EXCH_DBG(ep, "exch: ABTS received\n"); |
f95b35cf | 1423 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); |
57d3ec7e HR |
1424 | if (!fp) { |
1425 | FC_EXCH_DBG(ep, "Drop ABTS request, out of memory\n"); | |
f95b35cf | 1426 | goto free; |
57d3ec7e | 1427 | } |
f95b35cf | 1428 | |
42e9a92f RL |
1429 | spin_lock_bh(&ep->ex_lock); |
1430 | if (ep->esb_stat & ESB_ST_COMPLETE) { | |
1431 | spin_unlock_bh(&ep->ex_lock); | |
57d3ec7e | 1432 | FC_EXCH_DBG(ep, "exch: ABTS rejected, exchange complete\n"); |
f95b35cf | 1433 | fc_frame_free(fp); |
42e9a92f RL |
1434 | goto reject; |
1435 | } | |
cae7b6dd BVA |
1436 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { |
1437 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
42e9a92f | 1438 | fc_exch_hold(ep); /* hold for REC_QUAL */ |
cae7b6dd | 1439 | } |
42e9a92f | 1440 | fc_exch_timer_set_locked(ep, ep->r_a_tov); |
42e9a92f RL |
1441 | fh = fc_frame_header_get(fp); |
1442 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1443 | memset(ap, 0, sizeof(*ap)); | |
1444 | sp = &ep->seq; | |
1445 | ap->ba_high_seq_cnt = htons(0xffff); | |
1446 | if (sp->ssb_stat & SSB_ST_RESP) { | |
1447 | ap->ba_seq_id = sp->id; | |
1448 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; | |
1449 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; | |
1450 | ap->ba_low_seq_cnt = htons(sp->cnt); | |
1451 | } | |
a7e84f2b | 1452 | sp = fc_seq_start_next_locked(sp); |
42e9a92f | 1453 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); |
cae7b6dd | 1454 | ep->esb_stat |= ESB_ST_ABNORMAL; |
fb00cc23 | 1455 | spin_unlock_bh(&ep->ex_lock); |
f95b35cf BVA |
1456 | |
1457 | free: | |
42e9a92f RL |
1458 | fc_frame_free(rx_fp); |
1459 | return; | |
1460 | ||
1461 | reject: | |
1462 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); | |
f95b35cf | 1463 | goto free; |
42e9a92f RL |
1464 | } |
1465 | ||
239e8104 JE |
1466 | /** |
1467 | * fc_seq_assign() - Assign exchange and sequence for incoming request | |
1468 | * @lport: The local port that received the request | |
1469 | * @fp: The request frame | |
1470 | * | |
1471 | * On success, the sequence pointer will be returned and also in fr_seq(@fp). | |
62bdb645 JE |
1472 | * A reference will be held on the exchange/sequence for the caller, which |
1473 | * must call fc_seq_release(). | |
239e8104 | 1474 | */ |
96d564e2 | 1475 | struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) |
239e8104 JE |
1476 | { |
1477 | struct fc_exch_mgr_anchor *ema; | |
1478 | ||
1479 | WARN_ON(lport != fr_dev(fp)); | |
1480 | WARN_ON(fr_seq(fp)); | |
1481 | fr_seq(fp) = NULL; | |
1482 | ||
1483 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
1484 | if ((!ema->match || ema->match(fp)) && | |
530994d6 | 1485 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) |
239e8104 JE |
1486 | break; |
1487 | return fr_seq(fp); | |
1488 | } | |
96d564e2 | 1489 | EXPORT_SYMBOL(fc_seq_assign); |
239e8104 | 1490 | |
62bdb645 JE |
1491 | /** |
1492 | * fc_seq_release() - Release the hold | |
1493 | * @sp: The sequence. | |
1494 | */ | |
9625cc48 | 1495 | void fc_seq_release(struct fc_seq *sp) |
62bdb645 JE |
1496 | { |
1497 | fc_exch_release(fc_seq_exch(sp)); | |
1498 | } | |
9625cc48 | 1499 | EXPORT_SYMBOL(fc_seq_release); |
62bdb645 | 1500 | |
3a3b42bf | 1501 | /** |
92261156 | 1502 | * fc_exch_recv_req() - Handler for an incoming request |
3a3b42bf RL |
1503 | * @lport: The local port that received the request |
1504 | * @mp: The EM that the exchange is on | |
1505 | * @fp: The request frame | |
92261156 JE |
1506 | * |
1507 | * This is used when the other end is originating the exchange | |
1508 | * and the sequence. | |
42e9a92f | 1509 | */ |
3a3b42bf | 1510 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
42e9a92f RL |
1511 | struct fc_frame *fp) |
1512 | { | |
1513 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1514 | struct fc_seq *sp = NULL; | |
1515 | struct fc_exch *ep = NULL; | |
42e9a92f RL |
1516 | enum fc_pf_rjt_reason reject; |
1517 | ||
174e1ebf CL |
1518 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
1519 | * problem now that we know a new exchange needs to be allocated | |
1520 | */ | |
3a3b42bf RL |
1521 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
1522 | if (!lport) { | |
174e1ebf CL |
1523 | fc_frame_free(fp); |
1524 | return; | |
1525 | } | |
92261156 JE |
1526 | fr_dev(fp) = lport; |
1527 | ||
1528 | BUG_ON(fr_seq(fp)); /* XXX remove later */ | |
1529 | ||
1530 | /* | |
1531 | * If the RX_ID is 0xffff, don't allocate an exchange. | |
1532 | * The upper-level protocol may request one later, if needed. | |
1533 | */ | |
1534 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) | |
c5cb444c | 1535 | return fc_lport_recv(lport, fp); |
174e1ebf | 1536 | |
3a3b42bf | 1537 | reject = fc_seq_lookup_recip(lport, mp, fp); |
42e9a92f RL |
1538 | if (reject == FC_RJT_NONE) { |
1539 | sp = fr_seq(fp); /* sequence will be held */ | |
1540 | ep = fc_seq_exch(sp); | |
42e9a92f | 1541 | fc_seq_send_ack(sp, fp); |
f60e12e9 | 1542 | ep->encaps = fr_encaps(fp); |
42e9a92f RL |
1543 | |
1544 | /* | |
1545 | * Call the receive function. | |
1546 | * | |
1547 | * The receive function may allocate a new sequence | |
1548 | * over the old one, so we shouldn't change the | |
1549 | * sequence after this. | |
1550 | * | |
1551 | * The frame will be freed by the receive function. | |
1552 | * If new exch resp handler is valid then call that | |
1553 | * first. | |
1554 | */ | |
7030fd62 | 1555 | if (!fc_invoke_resp(ep, sp, fp)) |
c5cb444c | 1556 | fc_lport_recv(lport, fp); |
42e9a92f RL |
1557 | fc_exch_release(ep); /* release from lookup */ |
1558 | } else { | |
3a3b42bf RL |
1559 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
1560 | reject); | |
42e9a92f RL |
1561 | fc_frame_free(fp); |
1562 | } | |
1563 | } | |
1564 | ||
3a3b42bf RL |
1565 | /** |
1566 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other | |
1567 | * end is the originator of the sequence that is a | |
1568 | * response to our initial exchange | |
1569 | * @mp: The EM that the exchange is on | |
1570 | * @fp: The response frame | |
42e9a92f RL |
1571 | */ |
1572 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1573 | { | |
1574 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
1575 | struct fc_seq *sp; | |
1576 | struct fc_exch *ep; | |
1577 | enum fc_sof sof; | |
1578 | u32 f_ctl; | |
42e9a92f RL |
1579 | int rc; |
1580 | ||
1581 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); | |
1582 | if (!ep) { | |
1583 | atomic_inc(&mp->stats.xid_not_found); | |
1584 | goto out; | |
1585 | } | |
30121d14 SM |
1586 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
1587 | atomic_inc(&mp->stats.xid_not_found); | |
8236554a | 1588 | goto rel; |
30121d14 | 1589 | } |
42e9a92f RL |
1590 | if (ep->rxid == FC_XID_UNKNOWN) |
1591 | ep->rxid = ntohs(fh->fh_rx_id); | |
1592 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { | |
1593 | atomic_inc(&mp->stats.xid_not_found); | |
1594 | goto rel; | |
1595 | } | |
1596 | if (ep->did != ntoh24(fh->fh_s_id) && | |
1597 | ep->did != FC_FID_FLOGI) { | |
1598 | atomic_inc(&mp->stats.xid_not_found); | |
1599 | goto rel; | |
1600 | } | |
1601 | sof = fr_sof(fp); | |
a104c844 | 1602 | sp = &ep->seq; |
b3667f91 | 1603 | if (fc_sof_is_init(sof)) { |
42e9a92f | 1604 | sp->ssb_stat |= SSB_ST_RESP; |
b3667f91 | 1605 | sp->id = fh->fh_seq_id; |
42e9a92f | 1606 | } |
a104c844 | 1607 | |
42e9a92f RL |
1608 | f_ctl = ntoh24(fh->fh_f_ctl); |
1609 | fr_seq(fp) = sp; | |
5d73bea2 BVA |
1610 | |
1611 | spin_lock_bh(&ep->ex_lock); | |
42e9a92f RL |
1612 | if (f_ctl & FC_FC_SEQ_INIT) |
1613 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
5d73bea2 | 1614 | spin_unlock_bh(&ep->ex_lock); |
42e9a92f RL |
1615 | |
1616 | if (fc_sof_needs_ack(sof)) | |
1617 | fc_seq_send_ack(sp, fp); | |
42e9a92f RL |
1618 | |
1619 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && | |
1620 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == | |
1621 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { | |
1622 | spin_lock_bh(&ep->ex_lock); | |
1623 | rc = fc_exch_done_locked(ep); | |
1624 | WARN_ON(fc_seq_exch(sp) != ep); | |
1625 | spin_unlock_bh(&ep->ex_lock); | |
b2b0f16f | 1626 | if (!rc) { |
b2f0091f | 1627 | fc_exch_delete(ep); |
b2b0f16f JH |
1628 | } else { |
1629 | FC_EXCH_DBG(ep, "ep is completed already," | |
1630 | "hence skip calling the resp\n"); | |
1631 | goto skip_resp; | |
1632 | } | |
42e9a92f RL |
1633 | } |
1634 | ||
1635 | /* | |
1636 | * Call the receive function. | |
1637 | * The sequence is held (has a refcnt) for us, | |
1638 | * but not for the receive function. | |
1639 | * | |
1640 | * The receive function may allocate a new sequence | |
1641 | * over the old one, so we shouldn't change the | |
1642 | * sequence after this. | |
1643 | * | |
1644 | * The frame will be freed by the receive function. | |
1645 | * If new exch resp handler is valid then call that | |
1646 | * first. | |
1647 | */ | |
f6979ade BVA |
1648 | if (!fc_invoke_resp(ep, sp, fp)) |
1649 | fc_frame_free(fp); | |
7030fd62 | 1650 | |
b2b0f16f | 1651 | skip_resp: |
42e9a92f RL |
1652 | fc_exch_release(ep); |
1653 | return; | |
1654 | rel: | |
1655 | fc_exch_release(ep); | |
1656 | out: | |
1657 | fc_frame_free(fp); | |
1658 | } | |
1659 | ||
3a3b42bf RL |
1660 | /** |
1661 | * fc_exch_recv_resp() - Handler for a sequence where other end is | |
1662 | * responding to our sequence | |
1663 | * @mp: The EM that the exchange is on | |
1664 | * @fp: The response frame | |
42e9a92f RL |
1665 | */ |
1666 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1667 | { | |
1668 | struct fc_seq *sp; | |
1669 | ||
1670 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ | |
d459b7ea RL |
1671 | |
1672 | if (!sp) | |
42e9a92f | 1673 | atomic_inc(&mp->stats.xid_not_found); |
d459b7ea | 1674 | else |
42e9a92f | 1675 | atomic_inc(&mp->stats.non_bls_resp); |
d459b7ea | 1676 | |
42e9a92f RL |
1677 | fc_frame_free(fp); |
1678 | } | |
1679 | ||
3a3b42bf RL |
1680 | /** |
1681 | * fc_exch_abts_resp() - Handler for a response to an ABT | |
1682 | * @ep: The exchange that the frame is on | |
1683 | * @fp: The response frame | |
1684 | * | |
1685 | * This response would be to an ABTS cancelling an exchange or sequence. | |
1686 | * The response can be either BA_ACC or BA_RJT | |
42e9a92f RL |
1687 | */ |
1688 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) | |
1689 | { | |
42e9a92f RL |
1690 | struct fc_frame_header *fh; |
1691 | struct fc_ba_acc *ap; | |
1692 | struct fc_seq *sp; | |
1693 | u16 low; | |
1694 | u16 high; | |
1695 | int rc = 1, has_rec = 0; | |
1696 | ||
1697 | fh = fc_frame_header_get(fp); | |
7414705e RL |
1698 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
1699 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f | 1700 | |
b29a4f30 | 1701 | if (cancel_delayed_work_sync(&ep->timeout_work)) { |
3a292605 | 1702 | FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n"); |
42e9a92f | 1703 | fc_exch_release(ep); /* release from pending timer hold */ |
b29a4f30 | 1704 | } |
42e9a92f RL |
1705 | |
1706 | spin_lock_bh(&ep->ex_lock); | |
1707 | switch (fh->fh_r_ctl) { | |
1708 | case FC_RCTL_BA_ACC: | |
1709 | ap = fc_frame_payload_get(fp, sizeof(*ap)); | |
1710 | if (!ap) | |
1711 | break; | |
1712 | ||
1713 | /* | |
1714 | * Decide whether to establish a Recovery Qualifier. | |
1715 | * We do this if there is a non-empty SEQ_CNT range and | |
1716 | * SEQ_ID is the same as the one we aborted. | |
1717 | */ | |
1718 | low = ntohs(ap->ba_low_seq_cnt); | |
1719 | high = ntohs(ap->ba_high_seq_cnt); | |
1720 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && | |
1721 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || | |
1722 | ap->ba_seq_id == ep->seq_id) && low != high) { | |
1723 | ep->esb_stat |= ESB_ST_REC_QUAL; | |
1724 | fc_exch_hold(ep); /* hold for recovery qualifier */ | |
1725 | has_rec = 1; | |
1726 | } | |
1727 | break; | |
1728 | case FC_RCTL_BA_RJT: | |
1729 | break; | |
1730 | default: | |
1731 | break; | |
1732 | } | |
1733 | ||
42e9a92f RL |
1734 | /* do we need to do some other checks here. Can we reuse more of |
1735 | * fc_exch_recv_seq_resp | |
1736 | */ | |
1737 | sp = &ep->seq; | |
1738 | /* | |
1739 | * do we want to check END_SEQ as well as LAST_SEQ here? | |
1740 | */ | |
1741 | if (ep->fh_type != FC_TYPE_FCP && | |
1742 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) | |
1743 | rc = fc_exch_done_locked(ep); | |
1744 | spin_unlock_bh(&ep->ex_lock); | |
7030fd62 BVA |
1745 | |
1746 | fc_exch_hold(ep); | |
42e9a92f | 1747 | if (!rc) |
b2f0091f | 1748 | fc_exch_delete(ep); |
f6979ade BVA |
1749 | if (!fc_invoke_resp(ep, sp, fp)) |
1750 | fc_frame_free(fp); | |
42e9a92f RL |
1751 | if (has_rec) |
1752 | fc_exch_timer_set(ep, ep->r_a_tov); | |
7030fd62 | 1753 | fc_exch_release(ep); |
42e9a92f RL |
1754 | } |
1755 | ||
3a3b42bf RL |
1756 | /** |
1757 | * fc_exch_recv_bls() - Handler for a BLS sequence | |
1758 | * @mp: The EM that the exchange is on | |
1759 | * @fp: The request frame | |
1760 | * | |
1761 | * The BLS frame is always a sequence initiated by the remote side. | |
42e9a92f RL |
1762 | * We may be either the originator or recipient of the exchange. |
1763 | */ | |
1764 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) | |
1765 | { | |
1766 | struct fc_frame_header *fh; | |
1767 | struct fc_exch *ep; | |
1768 | u32 f_ctl; | |
1769 | ||
1770 | fh = fc_frame_header_get(fp); | |
1771 | f_ctl = ntoh24(fh->fh_f_ctl); | |
1772 | fr_seq(fp) = NULL; | |
1773 | ||
1774 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? | |
1775 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); | |
1776 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { | |
1777 | spin_lock_bh(&ep->ex_lock); | |
1778 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
1779 | spin_unlock_bh(&ep->ex_lock); | |
1780 | } | |
1781 | if (f_ctl & FC_FC_SEQ_CTX) { | |
1782 | /* | |
1783 | * A response to a sequence we initiated. | |
1784 | * This should only be ACKs for class 2 or F. | |
1785 | */ | |
1786 | switch (fh->fh_r_ctl) { | |
1787 | case FC_RCTL_ACK_1: | |
1788 | case FC_RCTL_ACK_0: | |
1789 | break; | |
1790 | default: | |
d4042e9c | 1791 | if (ep) |
b20d9bfd | 1792 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received\n", |
d4042e9c BPG |
1793 | fh->fh_r_ctl, |
1794 | fc_exch_rctl_name(fh->fh_r_ctl)); | |
42e9a92f RL |
1795 | break; |
1796 | } | |
1797 | fc_frame_free(fp); | |
1798 | } else { | |
1799 | switch (fh->fh_r_ctl) { | |
1800 | case FC_RCTL_BA_RJT: | |
1801 | case FC_RCTL_BA_ACC: | |
1802 | if (ep) | |
1803 | fc_exch_abts_resp(ep, fp); | |
1804 | else | |
1805 | fc_frame_free(fp); | |
1806 | break; | |
1807 | case FC_RCTL_BA_ABTS: | |
b73aa56e HR |
1808 | if (ep) |
1809 | fc_exch_recv_abts(ep, fp); | |
1810 | else | |
1811 | fc_frame_free(fp); | |
42e9a92f RL |
1812 | break; |
1813 | default: /* ignore junk */ | |
1814 | fc_frame_free(fp); | |
1815 | break; | |
1816 | } | |
1817 | } | |
1818 | if (ep) | |
1819 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ | |
1820 | } | |
1821 | ||
3a3b42bf RL |
1822 | /** |
1823 | * fc_seq_ls_acc() - Accept sequence with LS_ACC | |
92261156 | 1824 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1825 | * |
42e9a92f RL |
1826 | * If this fails due to allocation or transmit congestion, assume the |
1827 | * originator will repeat the sequence. | |
1828 | */ | |
92261156 | 1829 | static void fc_seq_ls_acc(struct fc_frame *rx_fp) |
42e9a92f | 1830 | { |
92261156 | 1831 | struct fc_lport *lport; |
42e9a92f RL |
1832 | struct fc_els_ls_acc *acc; |
1833 | struct fc_frame *fp; | |
57d3ec7e | 1834 | struct fc_seq *sp; |
42e9a92f | 1835 | |
92261156 | 1836 | lport = fr_dev(rx_fp); |
57d3ec7e | 1837 | sp = fr_seq(rx_fp); |
92261156 | 1838 | fp = fc_frame_alloc(lport, sizeof(*acc)); |
57d3ec7e HR |
1839 | if (!fp) { |
1840 | FC_EXCH_DBG(fc_seq_exch(sp), | |
1841 | "exch: drop LS_ACC, out of memory\n"); | |
92261156 | 1842 | return; |
57d3ec7e | 1843 | } |
92261156 JE |
1844 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
1845 | memset(acc, 0, sizeof(*acc)); | |
1846 | acc->la_cmd = ELS_LS_ACC; | |
1847 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1848 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1849 | } |
1850 | ||
3a3b42bf RL |
1851 | /** |
1852 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT | |
92261156 | 1853 | * @rx_fp: The received frame, not freed here. |
3a3b42bf | 1854 | * @reason: The reason the sequence is being rejected |
92261156 | 1855 | * @explan: The explanation for the rejection |
3a3b42bf | 1856 | * |
42e9a92f RL |
1857 | * If this fails due to allocation or transmit congestion, assume the |
1858 | * originator will repeat the sequence. | |
1859 | */ | |
92261156 | 1860 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, |
42e9a92f RL |
1861 | enum fc_els_rjt_explan explan) |
1862 | { | |
92261156 | 1863 | struct fc_lport *lport; |
42e9a92f RL |
1864 | struct fc_els_ls_rjt *rjt; |
1865 | struct fc_frame *fp; | |
57d3ec7e | 1866 | struct fc_seq *sp; |
42e9a92f | 1867 | |
92261156 | 1868 | lport = fr_dev(rx_fp); |
57d3ec7e | 1869 | sp = fr_seq(rx_fp); |
92261156 | 1870 | fp = fc_frame_alloc(lport, sizeof(*rjt)); |
57d3ec7e HR |
1871 | if (!fp) { |
1872 | FC_EXCH_DBG(fc_seq_exch(sp), | |
1873 | "exch: drop LS_ACC, out of memory\n"); | |
92261156 | 1874 | return; |
57d3ec7e | 1875 | } |
92261156 JE |
1876 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); |
1877 | memset(rjt, 0, sizeof(*rjt)); | |
1878 | rjt->er_cmd = ELS_LS_RJT; | |
1879 | rjt->er_reason = reason; | |
1880 | rjt->er_explan = explan; | |
1881 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); | |
1882 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
1883 | } |
1884 | ||
3a3b42bf RL |
1885 | /** |
1886 | * fc_exch_reset() - Reset an exchange | |
1887 | * @ep: The exchange to be reset | |
7030fd62 BVA |
1888 | * |
1889 | * Note: May sleep if invoked from outside a response handler. | |
3a3b42bf | 1890 | */ |
42e9a92f RL |
1891 | static void fc_exch_reset(struct fc_exch *ep) |
1892 | { | |
1893 | struct fc_seq *sp; | |
42e9a92f RL |
1894 | int rc = 1; |
1895 | ||
1896 | spin_lock_bh(&ep->ex_lock); | |
1897 | ep->state |= FC_EX_RST_CLEANUP; | |
b29a4f30 | 1898 | fc_exch_timer_cancel(ep); |
42e9a92f RL |
1899 | if (ep->esb_stat & ESB_ST_REC_QUAL) |
1900 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ | |
1901 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
42e9a92f RL |
1902 | sp = &ep->seq; |
1903 | rc = fc_exch_done_locked(ep); | |
1904 | spin_unlock_bh(&ep->ex_lock); | |
7030fd62 BVA |
1905 | |
1906 | fc_exch_hold(ep); | |
1907 | ||
b2b0f16f | 1908 | if (!rc) { |
b2f0091f | 1909 | fc_exch_delete(ep); |
b2b0f16f JH |
1910 | } else { |
1911 | FC_EXCH_DBG(ep, "ep is completed already," | |
1912 | "hence skip calling the resp\n"); | |
1913 | goto skip_resp; | |
1914 | } | |
42e9a92f | 1915 | |
7030fd62 | 1916 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED)); |
b2b0f16f | 1917 | skip_resp: |
7030fd62 BVA |
1918 | fc_seq_set_resp(sp, NULL, ep->arg); |
1919 | fc_exch_release(ep); | |
42e9a92f RL |
1920 | } |
1921 | ||
b2f0091f | 1922 | /** |
3a3b42bf RL |
1923 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
1924 | * @lport: The local port that the exchange pool is on | |
1925 | * @pool: The exchange pool to be reset | |
1926 | * @sid: The source ID | |
1927 | * @did: The destination ID | |
b2f0091f | 1928 | * |
3a3b42bf RL |
1929 | * Resets a per cpu exches pool, releasing all of its sequences |
1930 | * and exchanges. If sid is non-zero then reset only exchanges | |
1931 | * we sourced from the local port's FID. If did is non-zero then | |
1932 | * only reset exchanges destined for the local port's FID. | |
42e9a92f | 1933 | */ |
b2f0091f VD |
1934 | static void fc_exch_pool_reset(struct fc_lport *lport, |
1935 | struct fc_exch_pool *pool, | |
1936 | u32 sid, u32 did) | |
42e9a92f RL |
1937 | { |
1938 | struct fc_exch *ep; | |
1939 | struct fc_exch *next; | |
1940 | ||
b2f0091f | 1941 | spin_lock_bh(&pool->lock); |
42e9a92f | 1942 | restart: |
b2f0091f VD |
1943 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
1944 | if ((lport == ep->lp) && | |
1945 | (sid == 0 || sid == ep->sid) && | |
1946 | (did == 0 || did == ep->did)) { | |
1947 | fc_exch_hold(ep); | |
1948 | spin_unlock_bh(&pool->lock); | |
1949 | ||
1950 | fc_exch_reset(ep); | |
1951 | ||
1952 | fc_exch_release(ep); | |
1953 | spin_lock_bh(&pool->lock); | |
1954 | ||
1955 | /* | |
1956 | * must restart loop incase while lock | |
1957 | * was down multiple eps were released. | |
1958 | */ | |
1959 | goto restart; | |
42e9a92f | 1960 | } |
b2f0091f | 1961 | } |
b6e3c840 VD |
1962 | pool->next_index = 0; |
1963 | pool->left = FC_XID_UNKNOWN; | |
1964 | pool->right = FC_XID_UNKNOWN; | |
b2f0091f VD |
1965 | spin_unlock_bh(&pool->lock); |
1966 | } | |
1967 | ||
1968 | /** | |
3a3b42bf RL |
1969 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
1970 | * @lport: The local port whose EMs are to be reset | |
1971 | * @sid: The source ID | |
1972 | * @did: The destination ID | |
b2f0091f | 1973 | * |
3a3b42bf RL |
1974 | * Reset all EMs associated with a given local port. Release all |
1975 | * sequences and exchanges. If sid is non-zero then reset only the | |
1976 | * exchanges sent from the local port's FID. If did is non-zero then | |
1977 | * reset only exchanges destined for the local port's FID. | |
b2f0091f VD |
1978 | */ |
1979 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) | |
1980 | { | |
1981 | struct fc_exch_mgr_anchor *ema; | |
1982 | unsigned int cpu; | |
1983 | ||
1984 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
1985 | for_each_possible_cpu(cpu) | |
1986 | fc_exch_pool_reset(lport, | |
1987 | per_cpu_ptr(ema->mp->pool, cpu), | |
1988 | sid, did); | |
42e9a92f | 1989 | } |
42e9a92f RL |
1990 | } |
1991 | EXPORT_SYMBOL(fc_exch_mgr_reset); | |
1992 | ||
92261156 JE |
1993 | /** |
1994 | * fc_exch_lookup() - find an exchange | |
1995 | * @lport: The local port | |
1996 | * @xid: The exchange ID | |
1997 | * | |
1998 | * Returns exchange pointer with hold for caller, or NULL if not found. | |
1999 | */ | |
2000 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) | |
2001 | { | |
2002 | struct fc_exch_mgr_anchor *ema; | |
2003 | ||
2004 | list_for_each_entry(ema, &lport->ema_list, ema_list) | |
2005 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) | |
2006 | return fc_exch_find(ema->mp, xid); | |
2007 | return NULL; | |
2008 | } | |
2009 | ||
3a3b42bf RL |
2010 | /** |
2011 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests | |
92261156 | 2012 | * @rfp: The REC frame, not freed here. |
3a3b42bf | 2013 | * |
42e9a92f RL |
2014 | * Note that the requesting port may be different than the S_ID in the request. |
2015 | */ | |
92261156 | 2016 | static void fc_exch_els_rec(struct fc_frame *rfp) |
42e9a92f | 2017 | { |
92261156 | 2018 | struct fc_lport *lport; |
42e9a92f RL |
2019 | struct fc_frame *fp; |
2020 | struct fc_exch *ep; | |
42e9a92f RL |
2021 | struct fc_els_rec *rp; |
2022 | struct fc_els_rec_acc *acc; | |
2023 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; | |
2024 | enum fc_els_rjt_explan explan; | |
2025 | u32 sid; | |
e0a25286 | 2026 | u16 xid, rxid, oxid; |
42e9a92f | 2027 | |
92261156 | 2028 | lport = fr_dev(rfp); |
42e9a92f RL |
2029 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); |
2030 | explan = ELS_EXPL_INV_LEN; | |
2031 | if (!rp) | |
2032 | goto reject; | |
2033 | sid = ntoh24(rp->rec_s_id); | |
2034 | rxid = ntohs(rp->rec_rx_id); | |
2035 | oxid = ntohs(rp->rec_ox_id); | |
2036 | ||
42e9a92f | 2037 | explan = ELS_EXPL_OXID_RXID; |
e0a25286 HR |
2038 | if (sid == fc_host_port_id(lport->host)) |
2039 | xid = oxid; | |
2040 | else | |
2041 | xid = rxid; | |
2042 | if (xid == FC_XID_UNKNOWN) { | |
2043 | FC_LPORT_DBG(lport, | |
2044 | "REC request from %x: invalid rxid %x oxid %x\n", | |
2045 | sid, rxid, oxid); | |
2046 | goto reject; | |
2047 | } | |
2048 | ep = fc_exch_lookup(lport, xid); | |
57d3ec7e HR |
2049 | if (!ep) { |
2050 | FC_LPORT_DBG(lport, | |
2051 | "REC request from %x: rxid %x oxid %x not found\n", | |
2052 | sid, rxid, oxid); | |
92261156 | 2053 | goto reject; |
57d3ec7e HR |
2054 | } |
2055 | FC_EXCH_DBG(ep, "REC request from %x: rxid %x oxid %x\n", | |
2056 | sid, rxid, oxid); | |
92261156 JE |
2057 | if (ep->oid != sid || oxid != ep->oxid) |
2058 | goto rel; | |
2059 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) | |
2060 | goto rel; | |
2061 | fp = fc_frame_alloc(lport, sizeof(*acc)); | |
57d3ec7e HR |
2062 | if (!fp) { |
2063 | FC_EXCH_DBG(ep, "Drop REC request, out of memory\n"); | |
42e9a92f | 2064 | goto out; |
57d3ec7e | 2065 | } |
92261156 | 2066 | |
42e9a92f RL |
2067 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
2068 | memset(acc, 0, sizeof(*acc)); | |
2069 | acc->reca_cmd = ELS_LS_ACC; | |
2070 | acc->reca_ox_id = rp->rec_ox_id; | |
2071 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); | |
2072 | acc->reca_rx_id = htons(ep->rxid); | |
2073 | if (ep->sid == ep->oid) | |
2074 | hton24(acc->reca_rfid, ep->did); | |
2075 | else | |
2076 | hton24(acc->reca_rfid, ep->sid); | |
2077 | acc->reca_fc4value = htonl(ep->seq.rec_data); | |
2078 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | | |
2079 | ESB_ST_SEQ_INIT | | |
2080 | ESB_ST_COMPLETE)); | |
92261156 JE |
2081 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); |
2082 | lport->tt.frame_send(lport, fp); | |
42e9a92f RL |
2083 | out: |
2084 | fc_exch_release(ep); | |
42e9a92f RL |
2085 | return; |
2086 | ||
2087 | rel: | |
2088 | fc_exch_release(ep); | |
2089 | reject: | |
92261156 | 2090 | fc_seq_ls_rjt(rfp, reason, explan); |
42e9a92f RL |
2091 | } |
2092 | ||
3a3b42bf RL |
2093 | /** |
2094 | * fc_exch_rrq_resp() - Handler for RRQ responses | |
2095 | * @sp: The sequence that the RRQ is on | |
2096 | * @fp: The RRQ frame | |
2097 | * @arg: The exchange that the RRQ is on | |
42e9a92f RL |
2098 | * |
2099 | * TODO: fix error handler. | |
2100 | */ | |
2101 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) | |
2102 | { | |
2103 | struct fc_exch *aborted_ep = arg; | |
2104 | unsigned int op; | |
2105 | ||
2106 | if (IS_ERR(fp)) { | |
2107 | int err = PTR_ERR(fp); | |
2108 | ||
78342da3 | 2109 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
42e9a92f | 2110 | goto cleanup; |
7414705e RL |
2111 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
2112 | "frame error %d\n", err); | |
42e9a92f RL |
2113 | return; |
2114 | } | |
2115 | ||
2116 | op = fc_frame_payload_op(fp); | |
2117 | fc_frame_free(fp); | |
2118 | ||
2119 | switch (op) { | |
2120 | case ELS_LS_RJT: | |
b20d9bfd | 2121 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ\n"); |
df561f66 | 2122 | fallthrough; |
42e9a92f RL |
2123 | case ELS_LS_ACC: |
2124 | goto cleanup; | |
2125 | default: | |
b20d9bfd BVA |
2126 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x for RRQ\n", |
2127 | op); | |
42e9a92f RL |
2128 | return; |
2129 | } | |
2130 | ||
2131 | cleanup: | |
2132 | fc_exch_done(&aborted_ep->seq); | |
2133 | /* drop hold for rec qual */ | |
2134 | fc_exch_release(aborted_ep); | |
2135 | } | |
2136 | ||
1a7b75ae RL |
2137 | |
2138 | /** | |
3a3b42bf RL |
2139 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
2140 | * @lport: The local port to send the frame on | |
2141 | * @fp: The frame to be sent | |
2142 | * @resp: The response handler for this request | |
2143 | * @destructor: The destructor for the exchange | |
2144 | * @arg: The argument to be passed to the response handler | |
2145 | * @timer_msec: The timeout period for the exchange | |
2146 | * | |
3afd2d15 HR |
2147 | * The exchange response handler is set in this routine to resp() |
2148 | * function pointer. It can be called in two scenarios: if a timeout | |
2149 | * occurs or if a response frame is received for the exchange. The | |
2150 | * fc_frame pointer in response handler will also indicate timeout | |
2151 | * as error using IS_ERR related macros. | |
2152 | * | |
2153 | * The exchange destructor handler is also set in this routine. | |
2154 | * The destructor handler is invoked by EM layer when exchange | |
2155 | * is about to free, this can be used by caller to free its | |
2156 | * resources along with exchange free. | |
2157 | * | |
2158 | * The arg is passed back to resp and destructor handler. | |
2159 | * | |
2160 | * The timeout value (in msec) for an exchange is set if non zero | |
2161 | * timer_msec argument is specified. The timer is canceled when | |
2162 | * it fires or when the exchange is done. The exchange timeout handler | |
2163 | * is registered by EM layer. | |
2164 | * | |
3a3b42bf RL |
2165 | * The frame pointer with some of the header's fields must be |
2166 | * filled before calling this routine, those fields are: | |
2167 | * | |
2168 | * - routing control | |
2169 | * - FC port did | |
2170 | * - FC port sid | |
2171 | * - FC header type | |
2172 | * - frame control | |
2173 | * - parameter or relative offset | |
1a7b75ae | 2174 | */ |
3afd2d15 HR |
2175 | struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
2176 | struct fc_frame *fp, | |
2177 | void (*resp)(struct fc_seq *, | |
2178 | struct fc_frame *fp, | |
2179 | void *arg), | |
2180 | void (*destructor)(struct fc_seq *, void *), | |
2181 | void *arg, u32 timer_msec) | |
1a7b75ae RL |
2182 | { |
2183 | struct fc_exch *ep; | |
2184 | struct fc_seq *sp = NULL; | |
2185 | struct fc_frame_header *fh; | |
3ee17f59 | 2186 | struct fc_fcp_pkt *fsp = NULL; |
1a7b75ae RL |
2187 | int rc = 1; |
2188 | ||
3a3b42bf | 2189 | ep = fc_exch_alloc(lport, fp); |
1a7b75ae RL |
2190 | if (!ep) { |
2191 | fc_frame_free(fp); | |
2192 | return NULL; | |
2193 | } | |
2194 | ep->esb_stat |= ESB_ST_SEQ_INIT; | |
2195 | fh = fc_frame_header_get(fp); | |
2196 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); | |
2197 | ep->resp = resp; | |
2198 | ep->destructor = destructor; | |
2199 | ep->arg = arg; | |
f7ce413c | 2200 | ep->r_a_tov = lport->r_a_tov; |
3a3b42bf | 2201 | ep->lp = lport; |
1a7b75ae RL |
2202 | sp = &ep->seq; |
2203 | ||
2204 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ | |
2205 | ep->f_ctl = ntoh24(fh->fh_f_ctl); | |
2206 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); | |
2207 | sp->cnt++; | |
2208 | ||
3ee17f59 YZ |
2209 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) { |
2210 | fsp = fr_fsp(fp); | |
1a7b75ae | 2211 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
3ee17f59 | 2212 | } |
1a7b75ae | 2213 | |
3a3b42bf | 2214 | if (unlikely(lport->tt.frame_send(lport, fp))) |
1a7b75ae RL |
2215 | goto err; |
2216 | ||
2217 | if (timer_msec) | |
2218 | fc_exch_timer_set_locked(ep, timer_msec); | |
2219 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ | |
2220 | ||
2221 | if (ep->f_ctl & FC_FC_SEQ_INIT) | |
2222 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; | |
2223 | spin_unlock_bh(&ep->ex_lock); | |
2224 | return sp; | |
2225 | err: | |
3ee17f59 YZ |
2226 | if (fsp) |
2227 | fc_fcp_ddp_done(fsp); | |
1a7b75ae RL |
2228 | rc = fc_exch_done_locked(ep); |
2229 | spin_unlock_bh(&ep->ex_lock); | |
2230 | if (!rc) | |
2231 | fc_exch_delete(ep); | |
2232 | return NULL; | |
2233 | } | |
3afd2d15 | 2234 | EXPORT_SYMBOL(fc_exch_seq_send); |
1a7b75ae | 2235 | |
3a3b42bf RL |
2236 | /** |
2237 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command | |
2238 | * @ep: The exchange to send the RRQ on | |
2239 | * | |
42e9a92f RL |
2240 | * This tells the remote port to stop blocking the use of |
2241 | * the exchange and the seq_cnt range. | |
2242 | */ | |
2243 | static void fc_exch_rrq(struct fc_exch *ep) | |
2244 | { | |
3a3b42bf | 2245 | struct fc_lport *lport; |
42e9a92f RL |
2246 | struct fc_els_rrq *rrq; |
2247 | struct fc_frame *fp; | |
42e9a92f RL |
2248 | u32 did; |
2249 | ||
3a3b42bf | 2250 | lport = ep->lp; |
42e9a92f | 2251 | |
3a3b42bf | 2252 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
42e9a92f | 2253 | if (!fp) |
a0cc1ecc VD |
2254 | goto retry; |
2255 | ||
42e9a92f RL |
2256 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
2257 | memset(rrq, 0, sizeof(*rrq)); | |
2258 | rrq->rrq_cmd = ELS_RRQ; | |
2259 | hton24(rrq->rrq_s_id, ep->sid); | |
2260 | rrq->rrq_ox_id = htons(ep->oxid); | |
2261 | rrq->rrq_rx_id = htons(ep->rxid); | |
2262 | ||
2263 | did = ep->did; | |
2264 | if (ep->esb_stat & ESB_ST_RESP) | |
2265 | did = ep->sid; | |
2266 | ||
2267 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, | |
7b2787ec | 2268 | lport->port_id, FC_TYPE_ELS, |
42e9a92f RL |
2269 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
2270 | ||
3a3b42bf RL |
2271 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
2272 | lport->e_d_tov)) | |
a0cc1ecc VD |
2273 | return; |
2274 | ||
2275 | retry: | |
57d3ec7e | 2276 | FC_EXCH_DBG(ep, "exch: RRQ send failed\n"); |
a0cc1ecc VD |
2277 | spin_lock_bh(&ep->ex_lock); |
2278 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { | |
2279 | spin_unlock_bh(&ep->ex_lock); | |
2280 | /* drop hold for rec qual */ | |
2281 | fc_exch_release(ep); | |
42e9a92f RL |
2282 | return; |
2283 | } | |
a0cc1ecc VD |
2284 | ep->esb_stat |= ESB_ST_REC_QUAL; |
2285 | fc_exch_timer_set_locked(ep, ep->r_a_tov); | |
2286 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f RL |
2287 | } |
2288 | ||
3a3b42bf RL |
2289 | /** |
2290 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests | |
92261156 | 2291 | * @fp: The RRQ frame, not freed here. |
42e9a92f | 2292 | */ |
92261156 | 2293 | static void fc_exch_els_rrq(struct fc_frame *fp) |
42e9a92f | 2294 | { |
92261156 | 2295 | struct fc_lport *lport; |
3f127ad9 | 2296 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
42e9a92f RL |
2297 | struct fc_els_rrq *rp; |
2298 | u32 sid; | |
2299 | u16 xid; | |
2300 | enum fc_els_rjt_explan explan; | |
2301 | ||
92261156 | 2302 | lport = fr_dev(fp); |
42e9a92f RL |
2303 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
2304 | explan = ELS_EXPL_INV_LEN; | |
2305 | if (!rp) | |
2306 | goto reject; | |
2307 | ||
2308 | /* | |
2309 | * lookup subject exchange. | |
2310 | */ | |
42e9a92f | 2311 | sid = ntoh24(rp->rrq_s_id); /* subject source */ |
92261156 JE |
2312 | xid = fc_host_port_id(lport->host) == sid ? |
2313 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); | |
2314 | ep = fc_exch_lookup(lport, xid); | |
42e9a92f RL |
2315 | explan = ELS_EXPL_OXID_RXID; |
2316 | if (!ep) | |
2317 | goto reject; | |
2318 | spin_lock_bh(&ep->ex_lock); | |
57d3ec7e HR |
2319 | FC_EXCH_DBG(ep, "RRQ request from %x: xid %x rxid %x oxid %x\n", |
2320 | sid, xid, ntohs(rp->rrq_rx_id), ntohs(rp->rrq_ox_id)); | |
42e9a92f RL |
2321 | if (ep->oxid != ntohs(rp->rrq_ox_id)) |
2322 | goto unlock_reject; | |
2323 | if (ep->rxid != ntohs(rp->rrq_rx_id) && | |
2324 | ep->rxid != FC_XID_UNKNOWN) | |
2325 | goto unlock_reject; | |
2326 | explan = ELS_EXPL_SID; | |
2327 | if (ep->sid != sid) | |
2328 | goto unlock_reject; | |
2329 | ||
2330 | /* | |
2331 | * Clear Recovery Qualifier state, and cancel timer if complete. | |
2332 | */ | |
2333 | if (ep->esb_stat & ESB_ST_REC_QUAL) { | |
2334 | ep->esb_stat &= ~ESB_ST_REC_QUAL; | |
2335 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ | |
2336 | } | |
b29a4f30 VD |
2337 | if (ep->esb_stat & ESB_ST_COMPLETE) |
2338 | fc_exch_timer_cancel(ep); | |
42e9a92f RL |
2339 | |
2340 | spin_unlock_bh(&ep->ex_lock); | |
2341 | ||
2342 | /* | |
2343 | * Send LS_ACC. | |
2344 | */ | |
92261156 | 2345 | fc_seq_ls_acc(fp); |
3f127ad9 | 2346 | goto out; |
42e9a92f RL |
2347 | |
2348 | unlock_reject: | |
2349 | spin_unlock_bh(&ep->ex_lock); | |
42e9a92f | 2350 | reject: |
92261156 | 2351 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); |
3f127ad9 | 2352 | out: |
3f127ad9 VD |
2353 | if (ep) |
2354 | fc_exch_release(ep); /* drop hold from fc_exch_find */ | |
42e9a92f RL |
2355 | } |
2356 | ||
4e5fae7a VD |
2357 | /** |
2358 | * fc_exch_update_stats() - update exches stats to lport | |
2359 | * @lport: The local port to update exchange manager stats | |
2360 | */ | |
2361 | void fc_exch_update_stats(struct fc_lport *lport) | |
2362 | { | |
2363 | struct fc_host_statistics *st; | |
2364 | struct fc_exch_mgr_anchor *ema; | |
2365 | struct fc_exch_mgr *mp; | |
2366 | ||
2367 | st = &lport->host_stats; | |
2368 | ||
2369 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2370 | mp = ema->mp; | |
2371 | st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch); | |
2372 | st->fc_no_free_exch_xid += | |
2373 | atomic_read(&mp->stats.no_free_exch_xid); | |
2374 | st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found); | |
2375 | st->fc_xid_busy += atomic_read(&mp->stats.xid_busy); | |
2376 | st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found); | |
2377 | st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp); | |
2378 | } | |
2379 | } | |
2380 | EXPORT_SYMBOL(fc_exch_update_stats); | |
2381 | ||
3a3b42bf RL |
2382 | /** |
2383 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs | |
2384 | * @lport: The local port to add the exchange manager to | |
2385 | * @mp: The exchange manager to be added to the local port | |
2386 | * @match: The match routine that indicates when this EM should be used | |
2387 | */ | |
96316099 VD |
2388 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
2389 | struct fc_exch_mgr *mp, | |
2390 | bool (*match)(struct fc_frame *)) | |
2391 | { | |
2392 | struct fc_exch_mgr_anchor *ema; | |
2393 | ||
2394 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); | |
2395 | if (!ema) | |
2396 | return ema; | |
2397 | ||
2398 | ema->mp = mp; | |
2399 | ema->match = match; | |
2400 | /* add EM anchor to EM anchors list */ | |
2401 | list_add_tail(&ema->ema_list, &lport->ema_list); | |
2402 | kref_get(&mp->kref); | |
2403 | return ema; | |
2404 | } | |
2405 | EXPORT_SYMBOL(fc_exch_mgr_add); | |
2406 | ||
3a3b42bf RL |
2407 | /** |
2408 | * fc_exch_mgr_destroy() - Destroy an exchange manager | |
2409 | * @kref: The reference to the EM to be destroyed | |
2410 | */ | |
96316099 VD |
2411 | static void fc_exch_mgr_destroy(struct kref *kref) |
2412 | { | |
2413 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); | |
2414 | ||
96316099 | 2415 | mempool_destroy(mp->ep_pool); |
e4bc50be | 2416 | free_percpu(mp->pool); |
96316099 VD |
2417 | kfree(mp); |
2418 | } | |
2419 | ||
3a3b42bf RL |
2420 | /** |
2421 | * fc_exch_mgr_del() - Delete an EM from a local port's list | |
2422 | * @ema: The exchange manager anchor identifying the EM to be deleted | |
2423 | */ | |
96316099 VD |
2424 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
2425 | { | |
2426 | /* remove EM anchor from EM anchors list */ | |
2427 | list_del(&ema->ema_list); | |
2428 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); | |
2429 | kfree(ema); | |
2430 | } | |
2431 | EXPORT_SYMBOL(fc_exch_mgr_del); | |
2432 | ||
174e1ebf | 2433 | /** |
3a3b42bf RL |
2434 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
2435 | * @src: Source lport to clone exchange managers from | |
2436 | * @dst: New lport that takes references to all the exchange managers | |
174e1ebf CL |
2437 | */ |
2438 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) | |
2439 | { | |
2440 | struct fc_exch_mgr_anchor *ema, *tmp; | |
2441 | ||
2442 | list_for_each_entry(ema, &src->ema_list, ema_list) { | |
2443 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) | |
2444 | goto err; | |
2445 | } | |
2446 | return 0; | |
2447 | err: | |
2448 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) | |
2449 | fc_exch_mgr_del(ema); | |
2450 | return -ENOMEM; | |
2451 | } | |
72fa396b | 2452 | EXPORT_SYMBOL(fc_exch_mgr_list_clone); |
174e1ebf | 2453 | |
3a3b42bf RL |
2454 | /** |
2455 | * fc_exch_mgr_alloc() - Allocate an exchange manager | |
2456 | * @lport: The local port that the new EM will be associated with | |
2457 | * @class: The default FC class for new exchanges | |
2458 | * @min_xid: The minimum XID for exchanges from the new EM | |
2459 | * @max_xid: The maximum XID for exchanges from the new EM | |
2460 | * @match: The match routine for the new EM | |
2461 | */ | |
2462 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, | |
42e9a92f | 2463 | enum fc_class class, |
52ff878c VD |
2464 | u16 min_xid, u16 max_xid, |
2465 | bool (*match)(struct fc_frame *)) | |
42e9a92f RL |
2466 | { |
2467 | struct fc_exch_mgr *mp; | |
e4bc50be VD |
2468 | u16 pool_exch_range; |
2469 | size_t pool_size; | |
2470 | unsigned int cpu; | |
2471 | struct fc_exch_pool *pool; | |
42e9a92f | 2472 | |
e4bc50be VD |
2473 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
2474 | (min_xid & fc_cpu_mask) != 0) { | |
3a3b42bf | 2475 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
7414705e | 2476 | min_xid, max_xid); |
42e9a92f RL |
2477 | return NULL; |
2478 | } | |
2479 | ||
2480 | /* | |
b2f0091f | 2481 | * allocate memory for EM |
42e9a92f | 2482 | */ |
b2f0091f | 2483 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
42e9a92f RL |
2484 | if (!mp) |
2485 | return NULL; | |
2486 | ||
2487 | mp->class = class; | |
9ca1e182 | 2488 | mp->lport = lport; |
42e9a92f RL |
2489 | /* adjust em exch xid range for offload */ |
2490 | mp->min_xid = min_xid; | |
011a9008 SC |
2491 | |
2492 | /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */ | |
2493 | pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) / | |
2494 | sizeof(struct fc_exch *); | |
2495 | if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) { | |
2496 | mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) + | |
2497 | min_xid - 1; | |
2498 | } else { | |
2499 | mp->max_xid = max_xid; | |
2500 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / | |
2501 | (fc_cpu_mask + 1); | |
2502 | } | |
42e9a92f RL |
2503 | |
2504 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); | |
2505 | if (!mp->ep_pool) | |
2506 | goto free_mp; | |
2507 | ||
e4bc50be VD |
2508 | /* |
2509 | * Setup per cpu exch pool with entire exchange id range equally | |
2510 | * divided across all cpus. The exch pointers array memory is | |
2511 | * allocated for exch range per pool. | |
2512 | */ | |
e4bc50be VD |
2513 | mp->pool_max_index = pool_exch_range - 1; |
2514 | ||
2515 | /* | |
2516 | * Allocate and initialize per cpu exch pool | |
2517 | */ | |
2518 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); | |
2519 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); | |
2520 | if (!mp->pool) | |
2521 | goto free_mempool; | |
2522 | for_each_possible_cpu(cpu) { | |
2523 | pool = per_cpu_ptr(mp->pool, cpu); | |
b6e3c840 | 2524 | pool->next_index = 0; |
2034c19c HD |
2525 | pool->left = FC_XID_UNKNOWN; |
2526 | pool->right = FC_XID_UNKNOWN; | |
e4bc50be VD |
2527 | spin_lock_init(&pool->lock); |
2528 | INIT_LIST_HEAD(&pool->ex_list); | |
2529 | } | |
2530 | ||
52ff878c | 2531 | kref_init(&mp->kref); |
3a3b42bf | 2532 | if (!fc_exch_mgr_add(lport, mp, match)) { |
e4bc50be VD |
2533 | free_percpu(mp->pool); |
2534 | goto free_mempool; | |
52ff878c VD |
2535 | } |
2536 | ||
2537 | /* | |
2538 | * Above kref_init() sets mp->kref to 1 and then | |
2539 | * call to fc_exch_mgr_add incremented mp->kref again, | |
2540 | * so adjust that extra increment. | |
2541 | */ | |
2542 | kref_put(&mp->kref, fc_exch_mgr_destroy); | |
42e9a92f RL |
2543 | return mp; |
2544 | ||
e4bc50be VD |
2545 | free_mempool: |
2546 | mempool_destroy(mp->ep_pool); | |
42e9a92f RL |
2547 | free_mp: |
2548 | kfree(mp); | |
2549 | return NULL; | |
2550 | } | |
2551 | EXPORT_SYMBOL(fc_exch_mgr_alloc); | |
2552 | ||
3a3b42bf RL |
2553 | /** |
2554 | * fc_exch_mgr_free() - Free all exchange managers on a local port | |
2555 | * @lport: The local port whose EMs are to be freed | |
2556 | */ | |
52ff878c | 2557 | void fc_exch_mgr_free(struct fc_lport *lport) |
42e9a92f | 2558 | { |
52ff878c VD |
2559 | struct fc_exch_mgr_anchor *ema, *next; |
2560 | ||
4ae1e19f | 2561 | flush_workqueue(fc_exch_workqueue); |
52ff878c VD |
2562 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
2563 | fc_exch_mgr_del(ema); | |
42e9a92f RL |
2564 | } |
2565 | EXPORT_SYMBOL(fc_exch_mgr_free); | |
2566 | ||
6c8cc1c0 KP |
2567 | /** |
2568 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending | |
2569 | * upon 'xid'. | |
2570 | * @f_ctl: f_ctl | |
2571 | * @lport: The local port the frame was received on | |
2572 | * @fh: The received frame header | |
2573 | */ | |
2574 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, | |
2575 | struct fc_lport *lport, | |
2576 | struct fc_frame_header *fh) | |
2577 | { | |
2578 | struct fc_exch_mgr_anchor *ema; | |
2579 | u16 xid; | |
2580 | ||
2581 | if (f_ctl & FC_FC_EX_CTX) | |
2582 | xid = ntohs(fh->fh_ox_id); | |
2583 | else { | |
2584 | xid = ntohs(fh->fh_rx_id); | |
2585 | if (xid == FC_XID_UNKNOWN) | |
2586 | return list_entry(lport->ema_list.prev, | |
2587 | typeof(*ema), ema_list); | |
2588 | } | |
2589 | ||
2590 | list_for_each_entry(ema, &lport->ema_list, ema_list) { | |
2591 | if ((xid >= ema->mp->min_xid) && | |
2592 | (xid <= ema->mp->max_xid)) | |
2593 | return ema; | |
2594 | } | |
2595 | return NULL; | |
2596 | } | |
3a3b42bf RL |
2597 | /** |
2598 | * fc_exch_recv() - Handler for received frames | |
2599 | * @lport: The local port the frame was received on | |
6c8cc1c0 | 2600 | * @fp: The received frame |
42e9a92f | 2601 | */ |
3a3b42bf | 2602 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
2603 | { |
2604 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
52ff878c | 2605 | struct fc_exch_mgr_anchor *ema; |
6c8cc1c0 | 2606 | u32 f_ctl; |
42e9a92f RL |
2607 | |
2608 | /* lport lock ? */ | |
3a3b42bf | 2609 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
41a6bf65 | 2610 | FC_LIBFC_DBG("Receiving frames for an lport that " |
7414705e | 2611 | "has not been initialized correctly\n"); |
42e9a92f RL |
2612 | fc_frame_free(fp); |
2613 | return; | |
2614 | } | |
2615 | ||
52ff878c | 2616 | f_ctl = ntoh24(fh->fh_f_ctl); |
6c8cc1c0 KP |
2617 | ema = fc_find_ema(f_ctl, lport, fh); |
2618 | if (!ema) { | |
2619 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," | |
2620 | "fc_ctl <0x%x>, xid <0x%x>\n", | |
2621 | f_ctl, | |
2622 | (f_ctl & FC_FC_EX_CTX) ? | |
2623 | ntohs(fh->fh_ox_id) : | |
2624 | ntohs(fh->fh_rx_id)); | |
2625 | fc_frame_free(fp); | |
2626 | return; | |
2627 | } | |
52ff878c | 2628 | |
42e9a92f RL |
2629 | /* |
2630 | * If frame is marked invalid, just drop it. | |
2631 | */ | |
42e9a92f RL |
2632 | switch (fr_eof(fp)) { |
2633 | case FC_EOF_T: | |
2634 | if (f_ctl & FC_FC_END_SEQ) | |
2635 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); | |
df561f66 | 2636 | fallthrough; |
42e9a92f RL |
2637 | case FC_EOF_N: |
2638 | if (fh->fh_type == FC_TYPE_BLS) | |
52ff878c | 2639 | fc_exch_recv_bls(ema->mp, fp); |
42e9a92f RL |
2640 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
2641 | FC_FC_EX_CTX) | |
52ff878c | 2642 | fc_exch_recv_seq_resp(ema->mp, fp); |
42e9a92f | 2643 | else if (f_ctl & FC_FC_SEQ_CTX) |
52ff878c | 2644 | fc_exch_recv_resp(ema->mp, fp); |
92261156 | 2645 | else /* no EX_CTX and no SEQ_CTX */ |
3a3b42bf | 2646 | fc_exch_recv_req(lport, ema->mp, fp); |
42e9a92f RL |
2647 | break; |
2648 | default: | |
3a3b42bf RL |
2649 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
2650 | fr_eof(fp)); | |
42e9a92f | 2651 | fc_frame_free(fp); |
42e9a92f RL |
2652 | } |
2653 | } | |
2654 | EXPORT_SYMBOL(fc_exch_recv); | |
2655 | ||
3a3b42bf RL |
2656 | /** |
2657 | * fc_exch_init() - Initialize the exchange layer for a local port | |
2658 | * @lport: The local port to initialize the exchange layer for | |
2659 | */ | |
2660 | int fc_exch_init(struct fc_lport *lport) | |
42e9a92f | 2661 | { |
3a3b42bf RL |
2662 | if (!lport->tt.exch_mgr_reset) |
2663 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; | |
42e9a92f | 2664 | |
89f19a59 VD |
2665 | return 0; |
2666 | } | |
2667 | EXPORT_SYMBOL(fc_exch_init); | |
2668 | ||
2669 | /** | |
2670 | * fc_setup_exch_mgr() - Setup an exchange manager | |
2671 | */ | |
55204909 | 2672 | int fc_setup_exch_mgr(void) |
89f19a59 VD |
2673 | { |
2674 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), | |
2675 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2676 | if (!fc_em_cachep) | |
2677 | return -ENOMEM; | |
2678 | ||
e4bc50be VD |
2679 | /* |
2680 | * Initialize fc_cpu_mask and fc_cpu_order. The | |
2681 | * fc_cpu_mask is set for nr_cpu_ids rounded up | |
2682 | * to order of 2's * power and order is stored | |
2683 | * in fc_cpu_order as this is later required in | |
2684 | * mapping between an exch id and exch array index | |
2685 | * in per cpu exch pool. | |
2686 | * | |
2687 | * This round up is required to align fc_cpu_mask | |
2688 | * to exchange id's lower bits such that all incoming | |
2689 | * frames of an exchange gets delivered to the same | |
2690 | * cpu on which exchange originated by simple bitwise | |
2691 | * AND operation between fc_cpu_mask and exchange id. | |
2692 | */ | |
a84ea8c7 BVA |
2693 | fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids)); |
2694 | fc_cpu_mask = (1 << fc_cpu_order) - 1; | |
e4bc50be | 2695 | |
4ae1e19f VD |
2696 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
2697 | if (!fc_exch_workqueue) | |
6f06e3a7 | 2698 | goto err; |
42e9a92f | 2699 | return 0; |
6f06e3a7 HD |
2700 | err: |
2701 | kmem_cache_destroy(fc_em_cachep); | |
2702 | return -ENOMEM; | |
42e9a92f | 2703 | } |
42e9a92f | 2704 | |
3a3b42bf RL |
2705 | /** |
2706 | * fc_destroy_exch_mgr() - Destroy an exchange manager | |
2707 | */ | |
55204909 | 2708 | void fc_destroy_exch_mgr(void) |
42e9a92f | 2709 | { |
4ae1e19f | 2710 | destroy_workqueue(fc_exch_workqueue); |
42e9a92f RL |
2711 | kmem_cache_destroy(fc_em_cachep); |
2712 | } |