blob: efb6a4b7a62a15340ac239a2c09c1da825f153d8 [file] [log] [blame]
Robert Love42e9a922008-12-09 15:10:17 -08001/*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Maintained at www.Open-FCoE.org
20 */
21
22/*
23 * Fibre Channel exchange and sequence handling.
24 */
25
26#include <linux/timer.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Robert Love42e9a922008-12-09 15:10:17 -080028#include <linux/err.h>
Paul Gortmaker09703662011-05-27 09:37:25 -040029#include <linux/export.h>
Bart Van Asschea84ea8c2013-08-14 15:33:35 +000030#include <linux/log2.h>
Robert Love42e9a922008-12-09 15:10:17 -080031
32#include <scsi/fc/fc_fc2.h>
33
34#include <scsi/libfc.h>
35#include <scsi/fc_encode.h>
36
Robert Love8866a5d2009-11-03 11:45:58 -080037#include "fc_libfc.h"
38
Vasu Deve4bc50b2009-08-25 13:58:47 -070039u16 fc_cpu_mask; /* cpu mask for possible cpus */
40EXPORT_SYMBOL(fc_cpu_mask);
41static u16 fc_cpu_order; /* 2's power to represent total possible cpus */
Robert Love3a3b42b2009-11-03 11:47:39 -080042static struct kmem_cache *fc_em_cachep; /* cache for exchanges */
Randy Dunlap55204902011-01-28 16:03:57 -080043static struct workqueue_struct *fc_exch_workqueue;
Robert Love42e9a922008-12-09 15:10:17 -080044
45/*
46 * Structure and function definitions for managing Fibre Channel Exchanges
47 * and Sequences.
48 *
49 * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
50 *
51 * fc_exch_mgr holds the exchange state for an N port
52 *
53 * fc_exch holds state for one exchange and links to its active sequence.
54 *
55 * fc_seq holds the state for an individual sequence.
56 */
57
Robert Love3a3b42b2009-11-03 11:47:39 -080058/**
59 * struct fc_exch_pool - Per cpu exchange pool
60 * @next_index: Next possible free exchange index
61 * @total_exches: Total allocated exchanges
62 * @lock: Exch pool lock
63 * @ex_list: List of exchanges
Vasu Deve4bc50b2009-08-25 13:58:47 -070064 *
65 * This structure manages per cpu exchanges in array of exchange pointers.
66 * This array is allocated followed by struct fc_exch_pool memory for
67 * assigned range of exchanges to per cpu pool.
68 */
69struct fc_exch_pool {
Vasu Deve17b4af2011-09-27 21:38:08 -070070 spinlock_t lock;
71 struct list_head ex_list;
Robert Love3a3b42b2009-11-03 11:47:39 -080072 u16 next_index;
73 u16 total_exches;
Hillf Danton2034c192010-11-30 16:18:17 -080074
75 /* two cache of free slot in exch array */
76 u16 left;
77 u16 right;
Vasu Deve17b4af2011-09-27 21:38:08 -070078} ____cacheline_aligned_in_smp;
Vasu Deve4bc50b2009-08-25 13:58:47 -070079
Robert Love3a3b42b2009-11-03 11:47:39 -080080/**
81 * struct fc_exch_mgr - The Exchange Manager (EM).
82 * @class: Default class for new sequences
83 * @kref: Reference counter
84 * @min_xid: Minimum exchange ID
85 * @max_xid: Maximum exchange ID
86 * @ep_pool: Reserved exchange pointers
87 * @pool_max_index: Max exch array index in exch pool
88 * @pool: Per cpu exch pool
89 * @stats: Statistics structure
Robert Love42e9a922008-12-09 15:10:17 -080090 *
91 * This structure is the center for creating exchanges and sequences.
92 * It manages the allocation of exchange IDs.
93 */
94struct fc_exch_mgr {
Bart Van Asschec6b21c92012-01-13 17:26:20 -080095 struct fc_exch_pool __percpu *pool;
Vasu Deve17b4af2011-09-27 21:38:08 -070096 mempool_t *ep_pool;
Hannes Reinecke9ca1e182016-10-13 15:10:50 +020097 struct fc_lport *lport;
Robert Love3a3b42b2009-11-03 11:47:39 -080098 enum fc_class class;
99 struct kref kref;
100 u16 min_xid;
101 u16 max_xid;
Robert Love3a3b42b2009-11-03 11:47:39 -0800102 u16 pool_max_index;
Robert Love42e9a922008-12-09 15:10:17 -0800103
Robert Love42e9a922008-12-09 15:10:17 -0800104 struct {
105 atomic_t no_free_exch;
106 atomic_t no_free_exch_xid;
107 atomic_t xid_not_found;
108 atomic_t xid_busy;
109 atomic_t seq_not_found;
110 atomic_t non_bls_resp;
111 } stats;
Robert Love42e9a922008-12-09 15:10:17 -0800112};
Robert Love42e9a922008-12-09 15:10:17 -0800113
Robert Love3a3b42b2009-11-03 11:47:39 -0800114/**
115 * struct fc_exch_mgr_anchor - primary structure for list of EMs
116 * @ema_list: Exchange Manager Anchor list
117 * @mp: Exchange Manager associated with this anchor
118 * @match: Routine to determine if this anchor's EM should be used
119 *
120 * When walking the list of anchors the match routine will be called
121 * for each anchor to determine if that EM should be used. The last
122 * anchor in the list will always match to handle any exchanges not
123 * handled by other EMs. The non-default EMs would be added to the
Vasu Dev1bd49b42012-05-25 10:26:43 -0700124 * anchor list by HW that provides offloads.
Robert Love3a3b42b2009-11-03 11:47:39 -0800125 */
Vasu Dev96316092009-07-29 17:05:00 -0700126struct fc_exch_mgr_anchor {
127 struct list_head ema_list;
128 struct fc_exch_mgr *mp;
129 bool (*match)(struct fc_frame *);
130};
131
Robert Love42e9a922008-12-09 15:10:17 -0800132static void fc_exch_rrq(struct fc_exch *);
Joe Eykholt922611562010-07-20 15:21:12 -0700133static void fc_seq_ls_acc(struct fc_frame *);
134static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason,
Robert Love42e9a922008-12-09 15:10:17 -0800135 enum fc_els_rjt_explan);
Joe Eykholt922611562010-07-20 15:21:12 -0700136static void fc_exch_els_rec(struct fc_frame *);
137static void fc_exch_els_rrq(struct fc_frame *);
Robert Love42e9a922008-12-09 15:10:17 -0800138
139/*
140 * Internal implementation notes.
141 *
142 * The exchange manager is one by default in libfc but LLD may choose
143 * to have one per CPU. The sequence manager is one per exchange manager
144 * and currently never separated.
145 *
146 * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
147 * assigned by the Sequence Initiator that shall be unique for a specific
148 * D_ID and S_ID pair while the Sequence is open." Note that it isn't
149 * qualified by exchange ID, which one might think it would be.
150 * In practice this limits the number of open sequences and exchanges to 256
151 * per session. For most targets we could treat this limit as per exchange.
152 *
153 * The exchange and its sequence are freed when the last sequence is received.
154 * It's possible for the remote port to leave an exchange open without
155 * sending any sequences.
156 *
157 * Notes on reference counts:
158 *
159 * Exchanges are reference counted and exchange gets freed when the reference
160 * count becomes zero.
161 *
162 * Timeouts:
163 * Sequences are timed out for E_D_TOV and R_A_TOV.
164 *
165 * Sequence event handling:
166 *
167 * The following events may occur on initiator sequences:
168 *
169 * Send.
170 * For now, the whole thing is sent.
171 * Receive ACK
172 * This applies only to class F.
173 * The sequence is marked complete.
174 * ULP completion.
175 * The upper layer calls fc_exch_done() when done
176 * with exchange and sequence tuple.
177 * RX-inferred completion.
178 * When we receive the next sequence on the same exchange, we can
179 * retire the previous sequence ID. (XXX not implemented).
180 * Timeout.
181 * R_A_TOV frees the sequence ID. If we're waiting for ACK,
182 * E_D_TOV causes abort and calls upper layer response handler
183 * with FC_EX_TIMEOUT error.
184 * Receive RJT
185 * XXX defer.
186 * Send ABTS
187 * On timeout.
188 *
189 * The following events may occur on recipient sequences:
190 *
191 * Receive
192 * Allocate sequence for first frame received.
193 * Hold during receive handler.
194 * Release when final frame received.
195 * Keep status of last N of these for the ELS RES command. XXX TBD.
196 * Receive ABTS
197 * Deallocate sequence
198 * Send RJT
199 * Deallocate
200 *
201 * For now, we neglect conditions where only part of a sequence was
202 * received or transmitted, or where out-of-order receipt is detected.
203 */
204
205/*
206 * Locking notes:
207 *
208 * The EM code run in a per-CPU worker thread.
209 *
210 * To protect against concurrency between a worker thread code and timers,
211 * sequence allocation and deallocation must be locked.
212 * - exchange refcnt can be done atomicly without locks.
213 * - sequence allocation must be locked by exch lock.
Vasu Devb2f00912009-08-25 13:58:53 -0700214 * - If the EM pool lock and ex_lock must be taken at the same time, then the
215 * EM pool lock must be taken before the ex_lock.
Robert Love42e9a922008-12-09 15:10:17 -0800216 */
217
218/*
219 * opcode names for debugging.
220 */
221static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT;
222
Robert Love3a3b42b2009-11-03 11:47:39 -0800223/**
224 * fc_exch_name_lookup() - Lookup name by opcode
225 * @op: Opcode to be looked up
226 * @table: Opcode/name table
227 * @max_index: Index not to be exceeded
228 *
229 * This routine is used to determine a human-readable string identifying
230 * a R_CTL opcode.
231 */
Robert Love42e9a922008-12-09 15:10:17 -0800232static inline const char *fc_exch_name_lookup(unsigned int op, char **table,
233 unsigned int max_index)
234{
235 const char *name = NULL;
236
237 if (op < max_index)
238 name = table[op];
239 if (!name)
240 name = "unknown";
241 return name;
242}
243
Robert Love3a3b42b2009-11-03 11:47:39 -0800244/**
245 * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
246 * @op: The opcode to be looked up
247 */
Robert Love42e9a922008-12-09 15:10:17 -0800248static const char *fc_exch_rctl_name(unsigned int op)
249{
250 return fc_exch_name_lookup(op, fc_exch_rctl_names,
Kulikov Vasiliy7156fff2010-06-28 15:55:12 +0400251 ARRAY_SIZE(fc_exch_rctl_names));
Robert Love42e9a922008-12-09 15:10:17 -0800252}
253
Robert Love3a3b42b2009-11-03 11:47:39 -0800254/**
255 * fc_exch_hold() - Increment an exchange's reference count
256 * @ep: Echange to be held
Robert Love42e9a922008-12-09 15:10:17 -0800257 */
Robert Love3a3b42b2009-11-03 11:47:39 -0800258static inline void fc_exch_hold(struct fc_exch *ep)
Robert Love42e9a922008-12-09 15:10:17 -0800259{
260 atomic_inc(&ep->ex_refcnt);
261}
262
Robert Love3a3b42b2009-11-03 11:47:39 -0800263/**
264 * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
265 * and determine SOF and EOF.
266 * @ep: The exchange to that will use the header
267 * @fp: The frame whose header is to be modified
268 * @f_ctl: F_CTL bits that will be used for the frame header
269 *
270 * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
271 * fh_seq_id, fh_seq_cnt and the SOF and EOF.
Robert Love42e9a922008-12-09 15:10:17 -0800272 */
273static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp,
274 u32 f_ctl)
275{
276 struct fc_frame_header *fh = fc_frame_header_get(fp);
277 u16 fill;
278
279 fr_sof(fp) = ep->class;
280 if (ep->seq.cnt)
281 fr_sof(fp) = fc_sof_normal(ep->class);
282
283 if (f_ctl & FC_FC_END_SEQ) {
284 fr_eof(fp) = FC_EOF_T;
285 if (fc_sof_needs_ack(ep->class))
286 fr_eof(fp) = FC_EOF_N;
287 /*
Robert Love3a3b42b2009-11-03 11:47:39 -0800288 * From F_CTL.
Robert Love42e9a922008-12-09 15:10:17 -0800289 * The number of fill bytes to make the length a 4-byte
290 * multiple is the low order 2-bits of the f_ctl.
291 * The fill itself will have been cleared by the frame
292 * allocation.
293 * After this, the length will be even, as expected by
294 * the transport.
295 */
296 fill = fr_len(fp) & 3;
297 if (fill) {
298 fill = 4 - fill;
299 /* TODO, this may be a problem with fragmented skb */
300 skb_put(fp_skb(fp), fill);
301 hton24(fh->fh_f_ctl, f_ctl | fill);
302 }
303 } else {
304 WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */
305 fr_eof(fp) = FC_EOF_N;
306 }
307
Bart Van Asschec1d45422013-08-14 15:31:52 +0000308 /* Initialize remaining fh fields from fc_fill_fc_hdr */
Robert Love42e9a922008-12-09 15:10:17 -0800309 fh->fh_ox_id = htons(ep->oxid);
310 fh->fh_rx_id = htons(ep->rxid);
311 fh->fh_seq_id = ep->seq.id;
312 fh->fh_seq_cnt = htons(ep->seq.cnt);
313}
314
Robert Love3a3b42b2009-11-03 11:47:39 -0800315/**
316 * fc_exch_release() - Decrement an exchange's reference count
317 * @ep: Exchange to be released
318 *
319 * If the reference count reaches zero and the exchange is complete,
320 * it is freed.
Robert Love42e9a922008-12-09 15:10:17 -0800321 */
322static void fc_exch_release(struct fc_exch *ep)
323{
324 struct fc_exch_mgr *mp;
325
326 if (atomic_dec_and_test(&ep->ex_refcnt)) {
327 mp = ep->em;
328 if (ep->destructor)
329 ep->destructor(&ep->seq, ep->arg);
Julia Lawallaa6cd292009-02-04 22:17:29 +0100330 WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE));
Robert Love42e9a922008-12-09 15:10:17 -0800331 mempool_free(ep, mp->ep_pool);
332 }
333}
334
Robert Love3a3b42b2009-11-03 11:47:39 -0800335/**
Vasu Devb29a4f32012-07-06 10:40:10 -0700336 * fc_exch_timer_cancel() - cancel exch timer
337 * @ep: The exchange whose timer to be canceled
338 */
Robert Love4a80f082013-06-11 07:28:03 +0000339static inline void fc_exch_timer_cancel(struct fc_exch *ep)
Vasu Devb29a4f32012-07-06 10:40:10 -0700340{
341 if (cancel_delayed_work(&ep->timeout_work)) {
342 FC_EXCH_DBG(ep, "Exchange timer canceled\n");
343 atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
344 }
345}
346
347/**
348 * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
349 * the exchange lock held
350 * @ep: The exchange whose timer will start
351 * @timer_msec: The timeout period
352 *
353 * Used for upper level protocols to time out the exchange.
354 * The timer is cancelled when it fires or when the exchange completes.
355 */
356static inline void fc_exch_timer_set_locked(struct fc_exch *ep,
357 unsigned int timer_msec)
358{
359 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
360 return;
361
362 FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec);
363
Bart Van Asscheb8678862013-08-14 15:35:29 +0000364 fc_exch_hold(ep); /* hold for timer */
365 if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work,
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200366 msecs_to_jiffies(timer_msec))) {
367 FC_EXCH_DBG(ep, "Exchange already queued\n");
Bart Van Asscheb8678862013-08-14 15:35:29 +0000368 fc_exch_release(ep);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200369 }
Vasu Devb29a4f32012-07-06 10:40:10 -0700370}
371
372/**
373 * fc_exch_timer_set() - Lock the exchange and set the timer
374 * @ep: The exchange whose timer will start
375 * @timer_msec: The timeout period
376 */
377static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec)
378{
379 spin_lock_bh(&ep->ex_lock);
380 fc_exch_timer_set_locked(ep, timer_msec);
381 spin_unlock_bh(&ep->ex_lock);
382}
383
384/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800385 * fc_exch_done_locked() - Complete an exchange with the exchange lock held
386 * @ep: The exchange that is complete
Bart Van Assche7030fd62013-08-17 20:34:43 +0000387 *
388 * Note: May sleep if invoked from outside a response handler.
Robert Love3a3b42b2009-11-03 11:47:39 -0800389 */
Robert Love42e9a922008-12-09 15:10:17 -0800390static int fc_exch_done_locked(struct fc_exch *ep)
391{
392 int rc = 1;
393
394 /*
395 * We must check for completion in case there are two threads
396 * tyring to complete this. But the rrq code will reuse the
397 * ep, and in that case we only clear the resp and set it as
398 * complete, so it can be reused by the timer to send the rrq.
399 */
Robert Love42e9a922008-12-09 15:10:17 -0800400 if (ep->state & FC_EX_DONE)
401 return rc;
402 ep->esb_stat |= ESB_ST_COMPLETE;
403
404 if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
405 ep->state |= FC_EX_DONE;
Vasu Devb29a4f32012-07-06 10:40:10 -0700406 fc_exch_timer_cancel(ep);
Robert Love42e9a922008-12-09 15:10:17 -0800407 rc = 0;
408 }
409 return rc;
410}
411
Hannes Reinecke9ca1e182016-10-13 15:10:50 +0200412static struct fc_exch fc_quarantine_exch;
413
Robert Love3a3b42b2009-11-03 11:47:39 -0800414/**
415 * fc_exch_ptr_get() - Return an exchange from an exchange pool
416 * @pool: Exchange Pool to get an exchange from
417 * @index: Index of the exchange within the pool
418 *
419 * Use the index to get an exchange from within an exchange pool. exches
420 * will point to an array of exchange pointers. The index will select
421 * the exchange within the array.
422 */
Vasu Deve4bc50b2009-08-25 13:58:47 -0700423static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool,
424 u16 index)
425{
426 struct fc_exch **exches = (struct fc_exch **)(pool + 1);
427 return exches[index];
428}
429
Robert Love3a3b42b2009-11-03 11:47:39 -0800430/**
431 * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
432 * @pool: The pool to assign the exchange to
433 * @index: The index in the pool where the exchange will be assigned
434 * @ep: The exchange to assign to the pool
435 */
Vasu Deve4bc50b2009-08-25 13:58:47 -0700436static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index,
437 struct fc_exch *ep)
438{
439 ((struct fc_exch **)(pool + 1))[index] = ep;
440}
441
Robert Love3a3b42b2009-11-03 11:47:39 -0800442/**
443 * fc_exch_delete() - Delete an exchange
444 * @ep: The exchange to be deleted
445 */
Vasu Devb2f00912009-08-25 13:58:53 -0700446static void fc_exch_delete(struct fc_exch *ep)
Robert Love42e9a922008-12-09 15:10:17 -0800447{
Vasu Devb2f00912009-08-25 13:58:53 -0700448 struct fc_exch_pool *pool;
Hillf Danton2034c192010-11-30 16:18:17 -0800449 u16 index;
Robert Love42e9a922008-12-09 15:10:17 -0800450
Vasu Devb2f00912009-08-25 13:58:53 -0700451 pool = ep->pool;
452 spin_lock_bh(&pool->lock);
453 WARN_ON(pool->total_exches <= 0);
454 pool->total_exches--;
Hillf Danton2034c192010-11-30 16:18:17 -0800455
456 /* update cache of free slot */
457 index = (ep->xid - ep->em->min_xid) >> fc_cpu_order;
Hannes Reinecke9ca1e182016-10-13 15:10:50 +0200458 if (!(ep->state & FC_EX_QUARANTINE)) {
459 if (pool->left == FC_XID_UNKNOWN)
460 pool->left = index;
461 else if (pool->right == FC_XID_UNKNOWN)
462 pool->right = index;
463 else
464 pool->next_index = index;
465 fc_exch_ptr_set(pool, index, NULL);
466 } else {
467 fc_exch_ptr_set(pool, index, &fc_quarantine_exch);
468 }
Robert Love42e9a922008-12-09 15:10:17 -0800469 list_del(&ep->ex_list);
Vasu Devb2f00912009-08-25 13:58:53 -0700470 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800471 fc_exch_release(ep); /* drop hold for exch in mp */
472}
473
Neil Hormanfb00cc22013-05-03 19:34:15 +0000474static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp,
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000475 struct fc_frame *fp)
Robert Love1a7b75a2009-11-03 11:45:47 -0800476{
477 struct fc_exch *ep;
478 struct fc_frame_header *fh = fc_frame_header_get(fp);
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000479 int error = -ENXIO;
Robert Love3a3b42b2009-11-03 11:47:39 -0800480 u32 f_ctl;
Vasu Dev14fc3152011-10-28 11:34:12 -0700481 u8 fh_type = fh->fh_type;
Robert Love1a7b75a2009-11-03 11:45:47 -0800482
483 ep = fc_seq_exch(sp);
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000484
485 if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) {
486 fc_frame_free(fp);
487 goto out;
488 }
489
Neil Hormanfb00cc22013-05-03 19:34:15 +0000490 WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT));
Robert Love1a7b75a2009-11-03 11:45:47 -0800491
492 f_ctl = ntoh24(fh->fh_f_ctl);
493 fc_exch_setup_hdr(ep, fp, f_ctl);
Joe Eykholtf60e12e2010-07-20 15:20:14 -0700494 fr_encaps(fp) = ep->encaps;
Robert Love1a7b75a2009-11-03 11:45:47 -0800495
496 /*
497 * update sequence count if this frame is carrying
498 * multiple FC frames when sequence offload is enabled
499 * by LLD.
500 */
501 if (fr_max_payload(fp))
502 sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)),
503 fr_max_payload(fp));
504 else
505 sp->cnt++;
506
507 /*
508 * Send the frame.
509 */
Robert Love3a3b42b2009-11-03 11:47:39 -0800510 error = lport->tt.frame_send(lport, fp);
Robert Love1a7b75a2009-11-03 11:45:47 -0800511
Vasu Dev14fc3152011-10-28 11:34:12 -0700512 if (fh_type == FC_TYPE_BLS)
Neil Hormanfb00cc22013-05-03 19:34:15 +0000513 goto out;
Vasu Dev77a2b732011-08-25 12:40:52 -0700514
Robert Love1a7b75a2009-11-03 11:45:47 -0800515 /*
516 * Update the exchange and sequence flags,
517 * assuming all frames for the sequence have been sent.
518 * We can only be called to send once for each sequence.
519 */
Robert Love1a7b75a2009-11-03 11:45:47 -0800520 ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */
Joe Eykholtcc3593d2010-03-12 16:08:29 -0800521 if (f_ctl & FC_FC_SEQ_INIT)
Robert Love1a7b75a2009-11-03 11:45:47 -0800522 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
Neil Hormanfb00cc22013-05-03 19:34:15 +0000523out:
524 return error;
525}
526
527/**
528 * fc_seq_send() - Send a frame using existing sequence/exchange pair
529 * @lport: The local port that the exchange will be sent on
530 * @sp: The sequence to be sent
531 * @fp: The frame to be sent on the exchange
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000532 *
533 * Note: The frame will be freed either by a direct call to fc_frame_free(fp)
534 * or indirectly by calling libfc_function_template.frame_send().
Neil Hormanfb00cc22013-05-03 19:34:15 +0000535 */
Hannes Reinecke0cac9372016-10-18 10:01:48 +0200536int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp)
Neil Hormanfb00cc22013-05-03 19:34:15 +0000537{
538 struct fc_exch *ep;
539 int error;
540 ep = fc_seq_exch(sp);
541 spin_lock_bh(&ep->ex_lock);
542 error = fc_seq_send_locked(lport, sp, fp);
Robert Love1a7b75a2009-11-03 11:45:47 -0800543 spin_unlock_bh(&ep->ex_lock);
544 return error;
545}
Hannes Reinecke0cac9372016-10-18 10:01:48 +0200546EXPORT_SYMBOL(fc_seq_send);
Robert Love1a7b75a2009-11-03 11:45:47 -0800547
548/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800549 * fc_seq_alloc() - Allocate a sequence for a given exchange
550 * @ep: The exchange to allocate a new sequence for
551 * @seq_id: The sequence ID to be used
Robert Love1a7b75a2009-11-03 11:45:47 -0800552 *
553 * We don't support multiple originated sequences on the same exchange.
554 * By implication, any previously originated sequence on this exchange
555 * is complete, and we reallocate the same sequence.
556 */
557static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id)
558{
559 struct fc_seq *sp;
560
561 sp = &ep->seq;
562 sp->ssb_stat = 0;
563 sp->cnt = 0;
564 sp->id = seq_id;
565 return sp;
566}
567
Robert Love3a3b42b2009-11-03 11:47:39 -0800568/**
569 * fc_seq_start_next_locked() - Allocate a new sequence on the same
570 * exchange as the supplied sequence
571 * @sp: The sequence/exchange to get a new sequence for
572 */
Robert Love1a7b75a2009-11-03 11:45:47 -0800573static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp)
574{
575 struct fc_exch *ep = fc_seq_exch(sp);
576
577 sp = fc_seq_alloc(ep, ep->seq_id++);
578 FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n",
579 ep->f_ctl, sp->id);
580 return sp;
581}
582
583/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800584 * fc_seq_start_next() - Lock the exchange and get a new sequence
585 * for a given sequence/exchange pair
586 * @sp: The sequence/exchange to get a new exchange for
Robert Love1a7b75a2009-11-03 11:45:47 -0800587 */
Hannes Reineckec6865b32016-10-18 10:01:51 +0200588struct fc_seq *fc_seq_start_next(struct fc_seq *sp)
Robert Love1a7b75a2009-11-03 11:45:47 -0800589{
590 struct fc_exch *ep = fc_seq_exch(sp);
591
592 spin_lock_bh(&ep->ex_lock);
593 sp = fc_seq_start_next_locked(sp);
594 spin_unlock_bh(&ep->ex_lock);
595
596 return sp;
597}
Hannes Reineckec6865b32016-10-18 10:01:51 +0200598EXPORT_SYMBOL(fc_seq_start_next);
Robert Love1a7b75a2009-11-03 11:45:47 -0800599
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800600/*
601 * Set the response handler for the exchange associated with a sequence.
Bart Van Assche7030fd62013-08-17 20:34:43 +0000602 *
603 * Note: May sleep if invoked from outside a response handler.
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800604 */
Hannes Reineckef1d61e62016-10-18 10:01:52 +0200605void fc_seq_set_resp(struct fc_seq *sp,
606 void (*resp)(struct fc_seq *, struct fc_frame *, void *),
607 void *arg)
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800608{
609 struct fc_exch *ep = fc_seq_exch(sp);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000610 DEFINE_WAIT(wait);
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800611
612 spin_lock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000613 while (ep->resp_active && ep->resp_task != current) {
614 prepare_to_wait(&ep->resp_wq, &wait, TASK_UNINTERRUPTIBLE);
615 spin_unlock_bh(&ep->ex_lock);
616
617 schedule();
618
619 spin_lock_bh(&ep->ex_lock);
620 }
621 finish_wait(&ep->resp_wq, &wait);
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800622 ep->resp = resp;
623 ep->arg = arg;
624 spin_unlock_bh(&ep->ex_lock);
625}
Hannes Reineckef1d61e62016-10-18 10:01:52 +0200626EXPORT_SYMBOL(fc_seq_set_resp);
Joe Eykholt1a5c2d72011-01-28 16:04:08 -0800627
Robert Love1a7b75a2009-11-03 11:45:47 -0800628/**
Vasu Dev77a2b732011-08-25 12:40:52 -0700629 * fc_exch_abort_locked() - Abort an exchange
630 * @ep: The exchange to be aborted
Robert Love3a3b42b2009-11-03 11:47:39 -0800631 * @timer_msec: The period of time to wait before aborting
632 *
Hannes Reinecke0ebaed12016-10-18 10:01:49 +0200633 * Abort an exchange and sequence. Generally called because of a
634 * exchange timeout or an abort from the upper layer.
635 *
636 * A timer_msec can be specified for abort timeout, if non-zero
637 * timer_msec value is specified then exchange resp handler
638 * will be called with timeout error if no response to abort.
639 *
Vasu Dev77a2b732011-08-25 12:40:52 -0700640 * Locking notes: Called with exch lock held
641 *
642 * Return value: 0 on success else error code
Robert Love1a7b75a2009-11-03 11:45:47 -0800643 */
Vasu Dev77a2b732011-08-25 12:40:52 -0700644static int fc_exch_abort_locked(struct fc_exch *ep,
645 unsigned int timer_msec)
Robert Love42e9a922008-12-09 15:10:17 -0800646{
647 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -0800648 struct fc_frame *fp;
649 int error;
650
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200651 FC_EXCH_DBG(ep, "exch: abort, time %d msecs\n", timer_msec);
Robert Love42e9a922008-12-09 15:10:17 -0800652 if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) ||
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200653 ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) {
654 FC_EXCH_DBG(ep, "exch: already completed esb %x state %x\n",
655 ep->esb_stat, ep->state);
Robert Love42e9a922008-12-09 15:10:17 -0800656 return -ENXIO;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200657 }
Robert Love42e9a922008-12-09 15:10:17 -0800658
659 /*
660 * Send the abort on a new sequence if possible.
661 */
662 sp = fc_seq_start_next_locked(&ep->seq);
Vasu Dev77a2b732011-08-25 12:40:52 -0700663 if (!sp)
Robert Love42e9a922008-12-09 15:10:17 -0800664 return -ENOMEM;
Robert Love42e9a922008-12-09 15:10:17 -0800665
Robert Love42e9a922008-12-09 15:10:17 -0800666 if (timer_msec)
667 fc_exch_timer_set_locked(ep, timer_msec);
Robert Love42e9a922008-12-09 15:10:17 -0800668
Bart Van Asschecae7b6d2013-08-14 15:37:52 +0000669 if (ep->sid) {
670 /*
671 * Send an abort for the sequence that timed out.
672 */
673 fp = fc_frame_alloc(ep->lp, 0);
674 if (fp) {
675 ep->esb_stat |= ESB_ST_SEQ_INIT;
676 fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
677 FC_TYPE_BLS, FC_FC_END_SEQ |
678 FC_FC_SEQ_INIT, 0);
679 error = fc_seq_send_locked(ep->lp, sp, fp);
680 } else {
681 error = -ENOBUFS;
682 }
683 } else {
684 /*
685 * If not logged into the fabric, don't send ABTS but leave
686 * sequence active until next timeout.
687 */
688 error = 0;
689 }
690 ep->esb_stat |= ESB_ST_ABNORMAL;
Robert Love42e9a922008-12-09 15:10:17 -0800691 return error;
692}
Robert Love42e9a922008-12-09 15:10:17 -0800693
Robert Love3a3b42b2009-11-03 11:47:39 -0800694/**
Vasu Dev77a2b732011-08-25 12:40:52 -0700695 * fc_seq_exch_abort() - Abort an exchange and sequence
696 * @req_sp: The sequence to be aborted
697 * @timer_msec: The period of time to wait before aborting
698 *
699 * Generally called because of a timeout or an abort from the upper layer.
700 *
701 * Return value: 0 on success else error code
702 */
Hannes Reinecke0ebaed12016-10-18 10:01:49 +0200703int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec)
Vasu Dev77a2b732011-08-25 12:40:52 -0700704{
705 struct fc_exch *ep;
706 int error;
707
708 ep = fc_seq_exch(req_sp);
709 spin_lock_bh(&ep->ex_lock);
710 error = fc_exch_abort_locked(ep, timer_msec);
711 spin_unlock_bh(&ep->ex_lock);
712 return error;
713}
714
715/**
Bart Van Assche7030fd62013-08-17 20:34:43 +0000716 * fc_invoke_resp() - invoke ep->resp()
717 *
718 * Notes:
719 * It is assumed that after initialization finished (this means the
720 * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are
721 * modified only via fc_seq_set_resp(). This guarantees that none of these
722 * two variables changes if ep->resp_active > 0.
723 *
724 * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when
725 * this function is invoked, the first spin_lock_bh() call in this function
726 * will wait until fc_seq_set_resp() has finished modifying these variables.
727 *
728 * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that
729 * ep->resp() won't be invoked after fc_exch_done() has returned.
730 *
731 * The response handler itself may invoke fc_exch_done(), which will clear the
732 * ep->resp pointer.
733 *
734 * Return value:
735 * Returns true if and only if ep->resp has been invoked.
736 */
737static bool fc_invoke_resp(struct fc_exch *ep, struct fc_seq *sp,
738 struct fc_frame *fp)
739{
740 void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
741 void *arg;
742 bool res = false;
743
744 spin_lock_bh(&ep->ex_lock);
745 ep->resp_active++;
746 if (ep->resp_task != current)
747 ep->resp_task = !ep->resp_task ? current : NULL;
748 resp = ep->resp;
749 arg = ep->arg;
750 spin_unlock_bh(&ep->ex_lock);
751
752 if (resp) {
753 resp(sp, fp, arg);
754 res = true;
Bart Van Assche7030fd62013-08-17 20:34:43 +0000755 }
756
757 spin_lock_bh(&ep->ex_lock);
758 if (--ep->resp_active == 0)
759 ep->resp_task = NULL;
760 spin_unlock_bh(&ep->ex_lock);
761
762 if (ep->resp_active == 0)
763 wake_up(&ep->resp_wq);
764
765 return res;
766}
767
768/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800769 * fc_exch_timeout() - Handle exchange timer expiration
770 * @work: The work_struct identifying the exchange that timed out
Robert Love42e9a922008-12-09 15:10:17 -0800771 */
772static void fc_exch_timeout(struct work_struct *work)
773{
774 struct fc_exch *ep = container_of(work, struct fc_exch,
775 timeout_work.work);
776 struct fc_seq *sp = &ep->seq;
Robert Love42e9a922008-12-09 15:10:17 -0800777 u32 e_stat;
778 int rc = 1;
779
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +0200780 FC_EXCH_DBG(ep, "Exchange timed out state %x\n", ep->state);
Robert Lovecd305ce2009-08-25 13:58:37 -0700781
Robert Love42e9a922008-12-09 15:10:17 -0800782 spin_lock_bh(&ep->ex_lock);
783 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
784 goto unlock;
785
786 e_stat = ep->esb_stat;
787 if (e_stat & ESB_ST_COMPLETE) {
788 ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL;
Vasu Deva0cc1ec2009-07-28 17:33:37 -0700789 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -0800790 if (e_stat & ESB_ST_REC_QUAL)
791 fc_exch_rrq(ep);
Robert Love42e9a922008-12-09 15:10:17 -0800792 goto done;
793 } else {
Robert Love42e9a922008-12-09 15:10:17 -0800794 if (e_stat & ESB_ST_ABNORMAL)
795 rc = fc_exch_done_locked(ep);
796 spin_unlock_bh(&ep->ex_lock);
Parikh, Neeravf3162482011-02-25 15:02:56 -0800797 if (!rc)
798 fc_exch_delete(ep);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000799 fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_TIMEOUT));
800 fc_seq_set_resp(sp, NULL, ep->arg);
Robert Love42e9a922008-12-09 15:10:17 -0800801 fc_seq_exch_abort(sp, 2 * ep->r_a_tov);
802 goto done;
803 }
804unlock:
805 spin_unlock_bh(&ep->ex_lock);
806done:
807 /*
808 * This release matches the hold taken when the timer was set.
809 */
810 fc_exch_release(ep);
811}
812
Vasu Dev52ff8782009-07-29 17:05:10 -0700813/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800814 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
815 * @lport: The local port that the exchange is for
816 * @mp: The exchange manager that will allocate the exchange
Robert Love42e9a922008-12-09 15:10:17 -0800817 *
Vasu Devd7179682009-07-29 17:05:21 -0700818 * Returns pointer to allocated fc_exch with exch lock held.
Robert Love42e9a922008-12-09 15:10:17 -0800819 */
Vasu Dev52ff8782009-07-29 17:05:10 -0700820static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport,
Vasu Devd7179682009-07-29 17:05:21 -0700821 struct fc_exch_mgr *mp)
Robert Love42e9a922008-12-09 15:10:17 -0800822{
823 struct fc_exch *ep;
Vasu Devb2f00912009-08-25 13:58:53 -0700824 unsigned int cpu;
825 u16 index;
826 struct fc_exch_pool *pool;
Robert Love42e9a922008-12-09 15:10:17 -0800827
828 /* allocate memory for exchange */
829 ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC);
830 if (!ep) {
831 atomic_inc(&mp->stats.no_free_exch);
832 goto out;
833 }
834 memset(ep, 0, sizeof(*ep));
835
Joe Eykholtf018b732010-03-12 16:08:55 -0800836 cpu = get_cpu();
Vasu Devb2f00912009-08-25 13:58:53 -0700837 pool = per_cpu_ptr(mp->pool, cpu);
838 spin_lock_bh(&pool->lock);
Joe Eykholtf018b732010-03-12 16:08:55 -0800839 put_cpu();
Hillf Danton2034c192010-11-30 16:18:17 -0800840
841 /* peek cache of free slot */
842 if (pool->left != FC_XID_UNKNOWN) {
Hannes Reineckeb73aa562016-10-13 15:10:49 +0200843 if (!WARN_ON(fc_exch_ptr_get(pool, pool->left))) {
844 index = pool->left;
845 pool->left = FC_XID_UNKNOWN;
846 goto hit;
847 }
Hillf Danton2034c192010-11-30 16:18:17 -0800848 }
849 if (pool->right != FC_XID_UNKNOWN) {
Hannes Reineckeb73aa562016-10-13 15:10:49 +0200850 if (!WARN_ON(fc_exch_ptr_get(pool, pool->right))) {
851 index = pool->right;
852 pool->right = FC_XID_UNKNOWN;
853 goto hit;
854 }
Hillf Danton2034c192010-11-30 16:18:17 -0800855 }
856
Vasu Devb2f00912009-08-25 13:58:53 -0700857 index = pool->next_index;
858 /* allocate new exch from pool */
859 while (fc_exch_ptr_get(pool, index)) {
860 index = index == mp->pool_max_index ? 0 : index + 1;
861 if (index == pool->next_index)
Robert Love42e9a922008-12-09 15:10:17 -0800862 goto err;
Robert Love42e9a922008-12-09 15:10:17 -0800863 }
Vasu Devb2f00912009-08-25 13:58:53 -0700864 pool->next_index = index == mp->pool_max_index ? 0 : index + 1;
Hillf Danton2034c192010-11-30 16:18:17 -0800865hit:
Robert Love42e9a922008-12-09 15:10:17 -0800866 fc_exch_hold(ep); /* hold for exch in mp */
867 spin_lock_init(&ep->ex_lock);
868 /*
869 * Hold exch lock for caller to prevent fc_exch_reset()
870 * from releasing exch while fc_exch_alloc() caller is
871 * still working on exch.
872 */
873 spin_lock_bh(&ep->ex_lock);
874
Vasu Devb2f00912009-08-25 13:58:53 -0700875 fc_exch_ptr_set(pool, index, ep);
876 list_add_tail(&ep->ex_list, &pool->ex_list);
Robert Love42e9a922008-12-09 15:10:17 -0800877 fc_seq_alloc(ep, ep->seq_id++);
Vasu Devb2f00912009-08-25 13:58:53 -0700878 pool->total_exches++;
879 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800880
881 /*
882 * update exchange
883 */
Vasu Devb2f00912009-08-25 13:58:53 -0700884 ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid;
Robert Love42e9a922008-12-09 15:10:17 -0800885 ep->em = mp;
Vasu Devb2f00912009-08-25 13:58:53 -0700886 ep->pool = pool;
Vasu Dev52ff8782009-07-29 17:05:10 -0700887 ep->lp = lport;
Robert Love42e9a922008-12-09 15:10:17 -0800888 ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */
889 ep->rxid = FC_XID_UNKNOWN;
890 ep->class = mp->class;
Bart Van Assche7030fd62013-08-17 20:34:43 +0000891 ep->resp_active = 0;
892 init_waitqueue_head(&ep->resp_wq);
Robert Love42e9a922008-12-09 15:10:17 -0800893 INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout);
894out:
895 return ep;
896err:
Vasu Devb2f00912009-08-25 13:58:53 -0700897 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800898 atomic_inc(&mp->stats.no_free_exch_xid);
899 mempool_free(ep, mp->ep_pool);
900 return NULL;
901}
Vasu Dev52ff8782009-07-29 17:05:10 -0700902
903/**
Robert Love3a3b42b2009-11-03 11:47:39 -0800904 * fc_exch_alloc() - Allocate an exchange from an EM on a
905 * local port's list of EMs.
906 * @lport: The local port that will own the exchange
907 * @fp: The FC frame that the exchange will be for
Vasu Dev52ff8782009-07-29 17:05:10 -0700908 *
Robert Love3a3b42b2009-11-03 11:47:39 -0800909 * This function walks the list of exchange manager(EM)
910 * anchors to select an EM for a new exchange allocation. The
911 * EM is selected when a NULL match function pointer is encountered
912 * or when a call to a match function returns true.
Vasu Dev52ff8782009-07-29 17:05:10 -0700913 */
Martin K. Petersenf8f91f32016-10-14 16:37:29 -0400914static struct fc_exch *fc_exch_alloc(struct fc_lport *lport,
915 struct fc_frame *fp)
Vasu Dev52ff8782009-07-29 17:05:10 -0700916{
917 struct fc_exch_mgr_anchor *ema;
Martin K. Petersenf8f91f32016-10-14 16:37:29 -0400918 struct fc_exch *ep;
Vasu Dev52ff8782009-07-29 17:05:10 -0700919
Martin K. Petersenf8f91f32016-10-14 16:37:29 -0400920 list_for_each_entry(ema, &lport->ema_list, ema_list) {
921 if (!ema->match || ema->match(fp)) {
922 ep = fc_exch_em_alloc(lport, ema->mp);
923 if (ep)
924 return ep;
925 }
926 }
Vasu Dev52ff8782009-07-29 17:05:10 -0700927 return NULL;
928}
Robert Love42e9a922008-12-09 15:10:17 -0800929
Robert Love3a3b42b2009-11-03 11:47:39 -0800930/**
931 * fc_exch_find() - Lookup and hold an exchange
932 * @mp: The exchange manager to lookup the exchange from
933 * @xid: The XID of the exchange to look up
Robert Love42e9a922008-12-09 15:10:17 -0800934 */
935static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid)
936{
Hannes Reinecke9ca1e182016-10-13 15:10:50 +0200937 struct fc_lport *lport = mp->lport;
Vasu Devb2f00912009-08-25 13:58:53 -0700938 struct fc_exch_pool *pool;
Robert Love42e9a922008-12-09 15:10:17 -0800939 struct fc_exch *ep = NULL;
Chris Leechfa068832016-06-30 08:32:36 -0700940 u16 cpu = xid & fc_cpu_mask;
941
942 if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
Hannes Reinecke9ca1e182016-10-13 15:10:50 +0200943 pr_err("host%u: lport %6.6x: xid %d invalid CPU %d\n:",
944 lport->host->host_no, lport->port_id, xid, cpu);
Chris Leechfa068832016-06-30 08:32:36 -0700945 return NULL;
946 }
Robert Love42e9a922008-12-09 15:10:17 -0800947
948 if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) {
Chris Leechfa068832016-06-30 08:32:36 -0700949 pool = per_cpu_ptr(mp->pool, cpu);
Vasu Devb2f00912009-08-25 13:58:53 -0700950 spin_lock_bh(&pool->lock);
951 ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order);
Hannes Reinecke9ca1e182016-10-13 15:10:50 +0200952 if (ep == &fc_quarantine_exch) {
953 FC_LPORT_DBG(lport, "xid %x quarantined\n", xid);
954 ep = NULL;
955 }
Bart Van Assche8d080232013-08-17 20:20:07 +0000956 if (ep) {
957 WARN_ON(ep->xid != xid);
Robert Love42e9a922008-12-09 15:10:17 -0800958 fc_exch_hold(ep);
Bart Van Assche8d080232013-08-17 20:20:07 +0000959 }
Vasu Devb2f00912009-08-25 13:58:53 -0700960 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -0800961 }
962 return ep;
963}
964
Robert Love1a7b75a2009-11-03 11:45:47 -0800965
966/**
967 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
Robert Love3a3b42b2009-11-03 11:47:39 -0800968 * the memory allocated for the related objects may be freed.
969 * @sp: The sequence that has completed
Bart Van Assche7030fd62013-08-17 20:34:43 +0000970 *
971 * Note: May sleep if invoked from outside a response handler.
Robert Love1a7b75a2009-11-03 11:45:47 -0800972 */
Hannes Reinecke768c72c2016-10-18 10:01:50 +0200973void fc_exch_done(struct fc_seq *sp)
Robert Love42e9a922008-12-09 15:10:17 -0800974{
975 struct fc_exch *ep = fc_seq_exch(sp);
976 int rc;
977
978 spin_lock_bh(&ep->ex_lock);
979 rc = fc_exch_done_locked(ep);
980 spin_unlock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +0000981
982 fc_seq_set_resp(sp, NULL, ep->arg);
Robert Love42e9a922008-12-09 15:10:17 -0800983 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -0700984 fc_exch_delete(ep);
Robert Love42e9a922008-12-09 15:10:17 -0800985}
Hannes Reinecke768c72c2016-10-18 10:01:50 +0200986EXPORT_SYMBOL(fc_exch_done);
Robert Love42e9a922008-12-09 15:10:17 -0800987
Robert Love3a3b42b2009-11-03 11:47:39 -0800988/**
989 * fc_exch_resp() - Allocate a new exchange for a response frame
990 * @lport: The local port that the exchange was for
991 * @mp: The exchange manager to allocate the exchange from
992 * @fp: The response frame
993 *
Robert Love42e9a922008-12-09 15:10:17 -0800994 * Sets the responder ID in the frame header.
995 */
Vasu Dev52ff8782009-07-29 17:05:10 -0700996static struct fc_exch *fc_exch_resp(struct fc_lport *lport,
997 struct fc_exch_mgr *mp,
998 struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -0800999{
1000 struct fc_exch *ep;
1001 struct fc_frame_header *fh;
Robert Love42e9a922008-12-09 15:10:17 -08001002
Vasu Dev52ff8782009-07-29 17:05:10 -07001003 ep = fc_exch_alloc(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001004 if (ep) {
1005 ep->class = fc_frame_class(fp);
1006
1007 /*
1008 * Set EX_CTX indicating we're responding on this exchange.
1009 */
1010 ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */
1011 ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */
1012 fh = fc_frame_header_get(fp);
1013 ep->sid = ntoh24(fh->fh_d_id);
1014 ep->did = ntoh24(fh->fh_s_id);
1015 ep->oid = ep->did;
1016
1017 /*
1018 * Allocated exchange has placed the XID in the
1019 * originator field. Move it to the responder field,
1020 * and set the originator XID from the frame.
1021 */
1022 ep->rxid = ep->xid;
1023 ep->oxid = ntohs(fh->fh_ox_id);
1024 ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT;
1025 if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0)
1026 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
1027
Robert Love42e9a922008-12-09 15:10:17 -08001028 fc_exch_hold(ep); /* hold for caller */
Vasu Dev52ff8782009-07-29 17:05:10 -07001029 spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */
Robert Love42e9a922008-12-09 15:10:17 -08001030 }
1031 return ep;
1032}
1033
Robert Love3a3b42b2009-11-03 11:47:39 -08001034/**
1035 * fc_seq_lookup_recip() - Find a sequence where the other end
1036 * originated the sequence
1037 * @lport: The local port that the frame was sent to
1038 * @mp: The Exchange Manager to lookup the exchange from
1039 * @fp: The frame associated with the sequence we're looking for
1040 *
Robert Love42e9a922008-12-09 15:10:17 -08001041 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
1042 * on the ep that should be released by the caller.
1043 */
Vasu Dev52ff8782009-07-29 17:05:10 -07001044static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport,
1045 struct fc_exch_mgr *mp,
Robert Loveb2ab99c2009-02-27 10:55:50 -08001046 struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -08001047{
1048 struct fc_frame_header *fh = fc_frame_header_get(fp);
1049 struct fc_exch *ep = NULL;
1050 struct fc_seq *sp = NULL;
1051 enum fc_pf_rjt_reason reject = FC_RJT_NONE;
1052 u32 f_ctl;
1053 u16 xid;
1054
1055 f_ctl = ntoh24(fh->fh_f_ctl);
1056 WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0);
1057
1058 /*
1059 * Lookup or create the exchange if we will be creating the sequence.
1060 */
1061 if (f_ctl & FC_FC_EX_CTX) {
1062 xid = ntohs(fh->fh_ox_id); /* we originated exch */
1063 ep = fc_exch_find(mp, xid);
1064 if (!ep) {
1065 atomic_inc(&mp->stats.xid_not_found);
1066 reject = FC_RJT_OX_ID;
1067 goto out;
1068 }
1069 if (ep->rxid == FC_XID_UNKNOWN)
1070 ep->rxid = ntohs(fh->fh_rx_id);
1071 else if (ep->rxid != ntohs(fh->fh_rx_id)) {
1072 reject = FC_RJT_OX_ID;
1073 goto rel;
1074 }
1075 } else {
1076 xid = ntohs(fh->fh_rx_id); /* we are the responder */
1077
1078 /*
1079 * Special case for MDS issuing an ELS TEST with a
1080 * bad rxid of 0.
1081 * XXX take this out once we do the proper reject.
1082 */
1083 if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ &&
1084 fc_frame_payload_op(fp) == ELS_TEST) {
1085 fh->fh_rx_id = htons(FC_XID_UNKNOWN);
1086 xid = FC_XID_UNKNOWN;
1087 }
1088
1089 /*
1090 * new sequence - find the exchange
1091 */
1092 ep = fc_exch_find(mp, xid);
1093 if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) {
1094 if (ep) {
1095 atomic_inc(&mp->stats.xid_busy);
1096 reject = FC_RJT_RX_ID;
1097 goto rel;
1098 }
Vasu Dev52ff8782009-07-29 17:05:10 -07001099 ep = fc_exch_resp(lport, mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001100 if (!ep) {
1101 reject = FC_RJT_EXCH_EST; /* XXX */
1102 goto out;
1103 }
1104 xid = ep->xid; /* get our XID */
1105 } else if (!ep) {
1106 atomic_inc(&mp->stats.xid_not_found);
1107 reject = FC_RJT_RX_ID; /* XID not found */
1108 goto out;
1109 }
1110 }
1111
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001112 spin_lock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001113 /*
1114 * At this point, we have the exchange held.
1115 * Find or create the sequence.
1116 */
1117 if (fc_sof_is_init(fr_sof(fp))) {
Vasu Deva104c842010-03-12 16:08:34 -08001118 sp = &ep->seq;
Robert Love42e9a922008-12-09 15:10:17 -08001119 sp->ssb_stat |= SSB_ST_RESP;
Joe Eykholtb3667f92010-05-07 15:18:13 -07001120 sp->id = fh->fh_seq_id;
Robert Love42e9a922008-12-09 15:10:17 -08001121 } else {
1122 sp = &ep->seq;
1123 if (sp->id != fh->fh_seq_id) {
1124 atomic_inc(&mp->stats.seq_not_found);
Kiran Patile3e65c62011-06-20 16:59:30 -07001125 if (f_ctl & FC_FC_END_SEQ) {
1126 /*
1127 * Update sequence_id based on incoming last
1128 * frame of sequence exchange. This is needed
Vasu Dev1bd49b42012-05-25 10:26:43 -07001129 * for FC target where DDP has been used
Kiran Patile3e65c62011-06-20 16:59:30 -07001130 * on target where, stack is indicated only
1131 * about last frame's (payload _header) header.
1132 * Whereas "seq_id" which is part of
1133 * frame_header is allocated by initiator
1134 * which is totally different from "seq_id"
1135 * allocated when XFER_RDY was sent by target.
1136 * To avoid false -ve which results into not
1137 * sending RSP, hence write request on other
1138 * end never finishes.
1139 */
Kiran Patile3e65c62011-06-20 16:59:30 -07001140 sp->ssb_stat |= SSB_ST_RESP;
1141 sp->id = fh->fh_seq_id;
Kiran Patile3e65c62011-06-20 16:59:30 -07001142 } else {
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001143 spin_unlock_bh(&ep->ex_lock);
1144
Kiran Patile3e65c62011-06-20 16:59:30 -07001145 /* sequence/exch should exist */
1146 reject = FC_RJT_SEQ_ID;
1147 goto rel;
1148 }
Robert Love42e9a922008-12-09 15:10:17 -08001149 }
1150 }
1151 WARN_ON(ep != fc_seq_exch(sp));
1152
1153 if (f_ctl & FC_FC_SEQ_INIT)
1154 ep->esb_stat |= ESB_ST_SEQ_INIT;
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001155 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001156
1157 fr_seq(fp) = sp;
1158out:
1159 return reject;
1160rel:
1161 fc_exch_done(&ep->seq);
1162 fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */
1163 return reject;
1164}
1165
Robert Love3a3b42b2009-11-03 11:47:39 -08001166/**
1167 * fc_seq_lookup_orig() - Find a sequence where this end
1168 * originated the sequence
1169 * @mp: The Exchange Manager to lookup the exchange from
1170 * @fp: The frame associated with the sequence we're looking for
1171 *
Robert Love42e9a922008-12-09 15:10:17 -08001172 * Does not hold the sequence for the caller.
1173 */
1174static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp,
1175 struct fc_frame *fp)
1176{
1177 struct fc_frame_header *fh = fc_frame_header_get(fp);
1178 struct fc_exch *ep;
1179 struct fc_seq *sp = NULL;
1180 u32 f_ctl;
1181 u16 xid;
1182
1183 f_ctl = ntoh24(fh->fh_f_ctl);
1184 WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX);
1185 xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id);
1186 ep = fc_exch_find(mp, xid);
1187 if (!ep)
1188 return NULL;
1189 if (ep->seq.id == fh->fh_seq_id) {
1190 /*
1191 * Save the RX_ID if we didn't previously know it.
1192 */
1193 sp = &ep->seq;
1194 if ((f_ctl & FC_FC_EX_CTX) != 0 &&
1195 ep->rxid == FC_XID_UNKNOWN) {
1196 ep->rxid = ntohs(fh->fh_rx_id);
1197 }
1198 }
1199 fc_exch_release(ep);
1200 return sp;
1201}
1202
Robert Love3a3b42b2009-11-03 11:47:39 -08001203/**
1204 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
1205 * @ep: The exchange to set the addresses for
1206 * @orig_id: The originator's ID
1207 * @resp_id: The responder's ID
1208 *
Robert Love42e9a922008-12-09 15:10:17 -08001209 * Note this must be done before the first sequence of the exchange is sent.
1210 */
1211static void fc_exch_set_addr(struct fc_exch *ep,
1212 u32 orig_id, u32 resp_id)
1213{
1214 ep->oid = orig_id;
1215 if (ep->esb_stat & ESB_ST_RESP) {
1216 ep->sid = resp_id;
1217 ep->did = orig_id;
1218 } else {
1219 ep->sid = orig_id;
1220 ep->did = resp_id;
1221 }
1222}
1223
Robert Love1a7b75a2009-11-03 11:45:47 -08001224/**
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001225 * fc_seq_els_rsp_send() - Send an ELS response using information from
Robert Love3a3b42b2009-11-03 11:47:39 -08001226 * the existing sequence/exchange.
Joe Eykholt922611562010-07-20 15:21:12 -07001227 * @fp: The received frame
Robert Love3a3b42b2009-11-03 11:47:39 -08001228 * @els_cmd: The ELS command to be sent
1229 * @els_data: The ELS data to be sent
Joe Eykholt922611562010-07-20 15:21:12 -07001230 *
1231 * The received frame is not freed.
Robert Love42e9a922008-12-09 15:10:17 -08001232 */
Hannes Reinecke7ab24dd2016-10-18 10:01:35 +02001233void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd,
1234 struct fc_seq_els_data *els_data)
Robert Love42e9a922008-12-09 15:10:17 -08001235{
1236 switch (els_cmd) {
1237 case ELS_LS_RJT:
Joe Eykholt922611562010-07-20 15:21:12 -07001238 fc_seq_ls_rjt(fp, els_data->reason, els_data->explan);
Robert Love42e9a922008-12-09 15:10:17 -08001239 break;
1240 case ELS_LS_ACC:
Joe Eykholt922611562010-07-20 15:21:12 -07001241 fc_seq_ls_acc(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001242 break;
1243 case ELS_RRQ:
Joe Eykholt922611562010-07-20 15:21:12 -07001244 fc_exch_els_rrq(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001245 break;
1246 case ELS_REC:
Joe Eykholt922611562010-07-20 15:21:12 -07001247 fc_exch_els_rec(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001248 break;
1249 default:
Joe Eykholt922611562010-07-20 15:21:12 -07001250 FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd);
Robert Love42e9a922008-12-09 15:10:17 -08001251 }
1252}
Hannes Reinecke7ab24dd2016-10-18 10:01:35 +02001253EXPORT_SYMBOL_GPL(fc_seq_els_rsp_send);
Robert Love42e9a922008-12-09 15:10:17 -08001254
Robert Love3a3b42b2009-11-03 11:47:39 -08001255/**
1256 * fc_seq_send_last() - Send a sequence that is the last in the exchange
1257 * @sp: The sequence that is to be sent
1258 * @fp: The frame that will be sent on the sequence
1259 * @rctl: The R_CTL information to be sent
1260 * @fh_type: The frame header type
Robert Love42e9a922008-12-09 15:10:17 -08001261 */
1262static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp,
1263 enum fc_rctl rctl, enum fc_fh_type fh_type)
1264{
1265 u32 f_ctl;
1266 struct fc_exch *ep = fc_seq_exch(sp);
1267
1268 f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1269 f_ctl |= ep->f_ctl;
1270 fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0);
Neil Hormanfb00cc22013-05-03 19:34:15 +00001271 fc_seq_send_locked(ep->lp, sp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001272}
1273
Robert Love3a3b42b2009-11-03 11:47:39 -08001274/**
1275 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
1276 * @sp: The sequence to send the ACK on
1277 * @rx_fp: The received frame that is being acknoledged
1278 *
Robert Love42e9a922008-12-09 15:10:17 -08001279 * Send ACK_1 (or equiv.) indicating we received something.
Robert Love42e9a922008-12-09 15:10:17 -08001280 */
1281static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp)
1282{
1283 struct fc_frame *fp;
1284 struct fc_frame_header *rx_fh;
1285 struct fc_frame_header *fh;
1286 struct fc_exch *ep = fc_seq_exch(sp);
Robert Love3a3b42b2009-11-03 11:47:39 -08001287 struct fc_lport *lport = ep->lp;
Robert Love42e9a922008-12-09 15:10:17 -08001288 unsigned int f_ctl;
1289
1290 /*
1291 * Don't send ACKs for class 3.
1292 */
1293 if (fc_sof_needs_ack(fr_sof(rx_fp))) {
Robert Love3a3b42b2009-11-03 11:47:39 -08001294 fp = fc_frame_alloc(lport, 0);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001295 if (!fp) {
1296 FC_EXCH_DBG(ep, "Drop ACK request, out of memory\n");
Robert Love42e9a922008-12-09 15:10:17 -08001297 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001298 }
Robert Love42e9a922008-12-09 15:10:17 -08001299
1300 fh = fc_frame_header_get(fp);
1301 fh->fh_r_ctl = FC_RCTL_ACK_1;
1302 fh->fh_type = FC_TYPE_BLS;
1303
1304 /*
1305 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1306 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1307 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1308 * Last ACK uses bits 7-6 (continue sequence),
1309 * bits 5-4 are meaningful (what kind of ACK to use).
1310 */
1311 rx_fh = fc_frame_header_get(rx_fp);
1312 f_ctl = ntoh24(rx_fh->fh_f_ctl);
1313 f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
1314 FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ |
1315 FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT |
1316 FC_FC_RETX_SEQ | FC_FC_UNI_TX;
1317 f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
1318 hton24(fh->fh_f_ctl, f_ctl);
1319
1320 fc_exch_setup_hdr(ep, fp, f_ctl);
1321 fh->fh_seq_id = rx_fh->fh_seq_id;
1322 fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
1323 fh->fh_parm_offset = htonl(1); /* ack single frame */
1324
1325 fr_sof(fp) = fr_sof(rx_fp);
1326 if (f_ctl & FC_FC_END_SEQ)
1327 fr_eof(fp) = FC_EOF_T;
1328 else
1329 fr_eof(fp) = FC_EOF_N;
1330
Robert Love3a3b42b2009-11-03 11:47:39 -08001331 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001332 }
1333}
1334
Robert Love3a3b42b2009-11-03 11:47:39 -08001335/**
1336 * fc_exch_send_ba_rjt() - Send BLS Reject
1337 * @rx_fp: The frame being rejected
1338 * @reason: The reason the frame is being rejected
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001339 * @explan: The explanation for the rejection
Robert Love3a3b42b2009-11-03 11:47:39 -08001340 *
Robert Love42e9a922008-12-09 15:10:17 -08001341 * This is for rejecting BA_ABTS only.
1342 */
Robert Loveb2ab99c2009-02-27 10:55:50 -08001343static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp,
1344 enum fc_ba_rjt_reason reason,
1345 enum fc_ba_rjt_explan explan)
Robert Love42e9a922008-12-09 15:10:17 -08001346{
1347 struct fc_frame *fp;
1348 struct fc_frame_header *rx_fh;
1349 struct fc_frame_header *fh;
1350 struct fc_ba_rjt *rp;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001351 struct fc_seq *sp;
Robert Love3a3b42b2009-11-03 11:47:39 -08001352 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08001353 unsigned int f_ctl;
1354
Robert Love3a3b42b2009-11-03 11:47:39 -08001355 lport = fr_dev(rx_fp);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001356 sp = fr_seq(rx_fp);
Robert Love3a3b42b2009-11-03 11:47:39 -08001357 fp = fc_frame_alloc(lport, sizeof(*rp));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001358 if (!fp) {
1359 FC_EXCH_DBG(fc_seq_exch(sp),
1360 "Drop BA_RJT request, out of memory\n");
Robert Love42e9a922008-12-09 15:10:17 -08001361 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001362 }
Robert Love42e9a922008-12-09 15:10:17 -08001363 fh = fc_frame_header_get(fp);
1364 rx_fh = fc_frame_header_get(rx_fp);
1365
1366 memset(fh, 0, sizeof(*fh) + sizeof(*rp));
1367
1368 rp = fc_frame_payload_get(fp, sizeof(*rp));
1369 rp->br_reason = reason;
1370 rp->br_explan = explan;
1371
1372 /*
1373 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1374 */
1375 memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3);
1376 memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3);
Joe Eykholt1d490ce2009-08-25 14:04:03 -07001377 fh->fh_ox_id = rx_fh->fh_ox_id;
1378 fh->fh_rx_id = rx_fh->fh_rx_id;
Robert Love42e9a922008-12-09 15:10:17 -08001379 fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
1380 fh->fh_r_ctl = FC_RCTL_BA_RJT;
1381 fh->fh_type = FC_TYPE_BLS;
1382
1383 /*
1384 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1385 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1386 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1387 * Last ACK uses bits 7-6 (continue sequence),
1388 * bits 5-4 are meaningful (what kind of ACK to use).
1389 * Always set LAST_SEQ, END_SEQ.
1390 */
1391 f_ctl = ntoh24(rx_fh->fh_f_ctl);
1392 f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
1393 FC_FC_END_CONN | FC_FC_SEQ_INIT |
1394 FC_FC_RETX_SEQ | FC_FC_UNI_TX;
1395 f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
1396 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
1397 f_ctl &= ~FC_FC_FIRST_SEQ;
1398 hton24(fh->fh_f_ctl, f_ctl);
1399
1400 fr_sof(fp) = fc_sof_class(fr_sof(rx_fp));
1401 fr_eof(fp) = FC_EOF_T;
1402 if (fc_sof_needs_ack(fr_sof(fp)))
1403 fr_eof(fp) = FC_EOF_N;
1404
Robert Love3a3b42b2009-11-03 11:47:39 -08001405 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001406}
1407
Robert Love3a3b42b2009-11-03 11:47:39 -08001408/**
1409 * fc_exch_recv_abts() - Handle an incoming ABTS
1410 * @ep: The exchange the abort was on
1411 * @rx_fp: The ABTS frame
1412 *
1413 * This would be for target mode usually, but could be due to lost
1414 * FCP transfer ready, confirm or RRQ. We always handle this as an
1415 * exchange abort, ignoring the parameter.
Robert Love42e9a922008-12-09 15:10:17 -08001416 */
1417static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
1418{
1419 struct fc_frame *fp;
1420 struct fc_ba_acc *ap;
1421 struct fc_frame_header *fh;
1422 struct fc_seq *sp;
1423
1424 if (!ep)
1425 goto reject;
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001426
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001427 FC_EXCH_DBG(ep, "exch: ABTS received\n");
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001428 fp = fc_frame_alloc(ep->lp, sizeof(*ap));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001429 if (!fp) {
1430 FC_EXCH_DBG(ep, "Drop ABTS request, out of memory\n");
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001431 goto free;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001432 }
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001433
Robert Love42e9a922008-12-09 15:10:17 -08001434 spin_lock_bh(&ep->ex_lock);
1435 if (ep->esb_stat & ESB_ST_COMPLETE) {
1436 spin_unlock_bh(&ep->ex_lock);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001437 FC_EXCH_DBG(ep, "exch: ABTS rejected, exchange complete\n");
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001438 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001439 goto reject;
1440 }
Bart Van Asschecae7b6d2013-08-14 15:37:52 +00001441 if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
1442 ep->esb_stat |= ESB_ST_REC_QUAL;
Robert Love42e9a922008-12-09 15:10:17 -08001443 fc_exch_hold(ep); /* hold for REC_QUAL */
Bart Van Asschecae7b6d2013-08-14 15:37:52 +00001444 }
Robert Love42e9a922008-12-09 15:10:17 -08001445 fc_exch_timer_set_locked(ep, ep->r_a_tov);
Robert Love42e9a922008-12-09 15:10:17 -08001446 fh = fc_frame_header_get(fp);
1447 ap = fc_frame_payload_get(fp, sizeof(*ap));
1448 memset(ap, 0, sizeof(*ap));
1449 sp = &ep->seq;
1450 ap->ba_high_seq_cnt = htons(0xffff);
1451 if (sp->ssb_stat & SSB_ST_RESP) {
1452 ap->ba_seq_id = sp->id;
1453 ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL;
1454 ap->ba_high_seq_cnt = fh->fh_seq_cnt;
1455 ap->ba_low_seq_cnt = htons(sp->cnt);
1456 }
Vasu Deva7e84f22009-02-27 10:54:51 -08001457 sp = fc_seq_start_next_locked(sp);
Robert Love42e9a922008-12-09 15:10:17 -08001458 fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
Bart Van Asschecae7b6d2013-08-14 15:37:52 +00001459 ep->esb_stat |= ESB_ST_ABNORMAL;
Neil Hormanfb00cc22013-05-03 19:34:15 +00001460 spin_unlock_bh(&ep->ex_lock);
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001461
1462free:
Robert Love42e9a922008-12-09 15:10:17 -08001463 fc_frame_free(rx_fp);
1464 return;
1465
1466reject:
1467 fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID);
Bart Van Asschef95b35c2013-08-14 15:38:24 +00001468 goto free;
Robert Love42e9a922008-12-09 15:10:17 -08001469}
1470
Robert Love3a3b42b2009-11-03 11:47:39 -08001471/**
Joe Eykholt239e8102010-07-20 15:21:07 -07001472 * fc_seq_assign() - Assign exchange and sequence for incoming request
1473 * @lport: The local port that received the request
1474 * @fp: The request frame
1475 *
1476 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
Joe Eykholt62bdb642011-01-28 16:04:34 -08001477 * A reference will be held on the exchange/sequence for the caller, which
1478 * must call fc_seq_release().
Joe Eykholt239e8102010-07-20 15:21:07 -07001479 */
Hannes Reinecke96d564e2016-10-18 10:01:53 +02001480struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp)
Joe Eykholt239e8102010-07-20 15:21:07 -07001481{
1482 struct fc_exch_mgr_anchor *ema;
1483
1484 WARN_ON(lport != fr_dev(fp));
1485 WARN_ON(fr_seq(fp));
1486 fr_seq(fp) = NULL;
1487
1488 list_for_each_entry(ema, &lport->ema_list, ema_list)
1489 if ((!ema->match || ema->match(fp)) &&
Hillf Danton530994d2010-11-30 16:18:28 -08001490 fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE)
Joe Eykholt239e8102010-07-20 15:21:07 -07001491 break;
1492 return fr_seq(fp);
1493}
Hannes Reinecke96d564e2016-10-18 10:01:53 +02001494EXPORT_SYMBOL(fc_seq_assign);
Joe Eykholt239e8102010-07-20 15:21:07 -07001495
1496/**
Joe Eykholt62bdb642011-01-28 16:04:34 -08001497 * fc_seq_release() - Release the hold
1498 * @sp: The sequence.
1499 */
1500static void fc_seq_release(struct fc_seq *sp)
1501{
1502 fc_exch_release(fc_seq_exch(sp));
1503}
1504
1505/**
Joe Eykholt922611562010-07-20 15:21:12 -07001506 * fc_exch_recv_req() - Handler for an incoming request
Robert Love3a3b42b2009-11-03 11:47:39 -08001507 * @lport: The local port that received the request
1508 * @mp: The EM that the exchange is on
1509 * @fp: The request frame
Joe Eykholt922611562010-07-20 15:21:12 -07001510 *
1511 * This is used when the other end is originating the exchange
1512 * and the sequence.
Robert Love42e9a922008-12-09 15:10:17 -08001513 */
Robert Love3a3b42b2009-11-03 11:47:39 -08001514static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp,
Robert Love42e9a922008-12-09 15:10:17 -08001515 struct fc_frame *fp)
1516{
1517 struct fc_frame_header *fh = fc_frame_header_get(fp);
1518 struct fc_seq *sp = NULL;
1519 struct fc_exch *ep = NULL;
Robert Love42e9a922008-12-09 15:10:17 -08001520 enum fc_pf_rjt_reason reject;
1521
Chris Leech174e1eb2009-11-03 11:46:14 -08001522 /* We can have the wrong fc_lport at this point with NPIV, which is a
1523 * problem now that we know a new exchange needs to be allocated
1524 */
Robert Love3a3b42b2009-11-03 11:47:39 -08001525 lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id));
1526 if (!lport) {
Chris Leech174e1eb2009-11-03 11:46:14 -08001527 fc_frame_free(fp);
1528 return;
1529 }
Joe Eykholt922611562010-07-20 15:21:12 -07001530 fr_dev(fp) = lport;
Chris Leech174e1eb2009-11-03 11:46:14 -08001531
Joe Eykholt922611562010-07-20 15:21:12 -07001532 BUG_ON(fr_seq(fp)); /* XXX remove later */
1533
1534 /*
1535 * If the RX_ID is 0xffff, don't allocate an exchange.
1536 * The upper-level protocol may request one later, if needed.
1537 */
1538 if (fh->fh_rx_id == htons(FC_XID_UNKNOWN))
Hannes Reineckec5cb4442016-10-18 10:01:37 +02001539 return fc_lport_recv(lport, fp);
Joe Eykholt922611562010-07-20 15:21:12 -07001540
Robert Love3a3b42b2009-11-03 11:47:39 -08001541 reject = fc_seq_lookup_recip(lport, mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001542 if (reject == FC_RJT_NONE) {
1543 sp = fr_seq(fp); /* sequence will be held */
1544 ep = fc_seq_exch(sp);
Robert Love42e9a922008-12-09 15:10:17 -08001545 fc_seq_send_ack(sp, fp);
Joe Eykholtf60e12e2010-07-20 15:20:14 -07001546 ep->encaps = fr_encaps(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001547
1548 /*
1549 * Call the receive function.
1550 *
1551 * The receive function may allocate a new sequence
1552 * over the old one, so we shouldn't change the
1553 * sequence after this.
1554 *
1555 * The frame will be freed by the receive function.
1556 * If new exch resp handler is valid then call that
1557 * first.
1558 */
Bart Van Assche7030fd62013-08-17 20:34:43 +00001559 if (!fc_invoke_resp(ep, sp, fp))
Hannes Reineckec5cb4442016-10-18 10:01:37 +02001560 fc_lport_recv(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001561 fc_exch_release(ep); /* release from lookup */
1562 } else {
Robert Love3a3b42b2009-11-03 11:47:39 -08001563 FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n",
1564 reject);
Robert Love42e9a922008-12-09 15:10:17 -08001565 fc_frame_free(fp);
1566 }
1567}
1568
Robert Love3a3b42b2009-11-03 11:47:39 -08001569/**
1570 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1571 * end is the originator of the sequence that is a
1572 * response to our initial exchange
1573 * @mp: The EM that the exchange is on
1574 * @fp: The response frame
Robert Love42e9a922008-12-09 15:10:17 -08001575 */
1576static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
1577{
1578 struct fc_frame_header *fh = fc_frame_header_get(fp);
1579 struct fc_seq *sp;
1580 struct fc_exch *ep;
1581 enum fc_sof sof;
1582 u32 f_ctl;
Robert Love42e9a922008-12-09 15:10:17 -08001583 int rc;
1584
1585 ep = fc_exch_find(mp, ntohs(fh->fh_ox_id));
1586 if (!ep) {
1587 atomic_inc(&mp->stats.xid_not_found);
1588 goto out;
1589 }
Steve Ma30121d12009-05-06 10:52:29 -07001590 if (ep->esb_stat & ESB_ST_COMPLETE) {
1591 atomic_inc(&mp->stats.xid_not_found);
Hillf Danton82365542010-11-30 16:18:12 -08001592 goto rel;
Steve Ma30121d12009-05-06 10:52:29 -07001593 }
Robert Love42e9a922008-12-09 15:10:17 -08001594 if (ep->rxid == FC_XID_UNKNOWN)
1595 ep->rxid = ntohs(fh->fh_rx_id);
1596 if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) {
1597 atomic_inc(&mp->stats.xid_not_found);
1598 goto rel;
1599 }
1600 if (ep->did != ntoh24(fh->fh_s_id) &&
1601 ep->did != FC_FID_FLOGI) {
1602 atomic_inc(&mp->stats.xid_not_found);
1603 goto rel;
1604 }
1605 sof = fr_sof(fp);
Vasu Deva104c842010-03-12 16:08:34 -08001606 sp = &ep->seq;
Joe Eykholtb3667f92010-05-07 15:18:13 -07001607 if (fc_sof_is_init(sof)) {
Robert Love42e9a922008-12-09 15:10:17 -08001608 sp->ssb_stat |= SSB_ST_RESP;
Joe Eykholtb3667f92010-05-07 15:18:13 -07001609 sp->id = fh->fh_seq_id;
Robert Love42e9a922008-12-09 15:10:17 -08001610 }
Vasu Deva104c842010-03-12 16:08:34 -08001611
Robert Love42e9a922008-12-09 15:10:17 -08001612 f_ctl = ntoh24(fh->fh_f_ctl);
1613 fr_seq(fp) = sp;
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001614
1615 spin_lock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001616 if (f_ctl & FC_FC_SEQ_INIT)
1617 ep->esb_stat |= ESB_ST_SEQ_INIT;
Bart Van Assche5d73bea2013-08-14 15:37:08 +00001618 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08001619
1620 if (fc_sof_needs_ack(sof))
1621 fc_seq_send_ack(sp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001622
1623 if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T &&
1624 (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
1625 (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
1626 spin_lock_bh(&ep->ex_lock);
1627 rc = fc_exch_done_locked(ep);
1628 WARN_ON(fc_seq_exch(sp) != ep);
1629 spin_unlock_bh(&ep->ex_lock);
1630 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -07001631 fc_exch_delete(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001632 }
1633
1634 /*
1635 * Call the receive function.
1636 * The sequence is held (has a refcnt) for us,
1637 * but not for the receive function.
1638 *
1639 * The receive function may allocate a new sequence
1640 * over the old one, so we shouldn't change the
1641 * sequence after this.
1642 *
1643 * The frame will be freed by the receive function.
1644 * If new exch resp handler is valid then call that
1645 * first.
1646 */
Bart Van Asschef6979ad2015-06-05 14:20:46 -07001647 if (!fc_invoke_resp(ep, sp, fp))
1648 fc_frame_free(fp);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001649
Robert Love42e9a922008-12-09 15:10:17 -08001650 fc_exch_release(ep);
1651 return;
1652rel:
1653 fc_exch_release(ep);
1654out:
1655 fc_frame_free(fp);
1656}
1657
Robert Love3a3b42b2009-11-03 11:47:39 -08001658/**
1659 * fc_exch_recv_resp() - Handler for a sequence where other end is
1660 * responding to our sequence
1661 * @mp: The EM that the exchange is on
1662 * @fp: The response frame
Robert Love42e9a922008-12-09 15:10:17 -08001663 */
1664static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
1665{
1666 struct fc_seq *sp;
1667
1668 sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */
Robert Loved459b7e2009-07-29 17:05:05 -07001669
1670 if (!sp)
Robert Love42e9a922008-12-09 15:10:17 -08001671 atomic_inc(&mp->stats.xid_not_found);
Robert Loved459b7e2009-07-29 17:05:05 -07001672 else
Robert Love42e9a922008-12-09 15:10:17 -08001673 atomic_inc(&mp->stats.non_bls_resp);
Robert Loved459b7e2009-07-29 17:05:05 -07001674
Robert Love42e9a922008-12-09 15:10:17 -08001675 fc_frame_free(fp);
1676}
1677
Robert Love3a3b42b2009-11-03 11:47:39 -08001678/**
1679 * fc_exch_abts_resp() - Handler for a response to an ABT
1680 * @ep: The exchange that the frame is on
1681 * @fp: The response frame
1682 *
1683 * This response would be to an ABTS cancelling an exchange or sequence.
1684 * The response can be either BA_ACC or BA_RJT
Robert Love42e9a922008-12-09 15:10:17 -08001685 */
1686static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
1687{
Robert Love42e9a922008-12-09 15:10:17 -08001688 struct fc_frame_header *fh;
1689 struct fc_ba_acc *ap;
1690 struct fc_seq *sp;
1691 u16 low;
1692 u16 high;
1693 int rc = 1, has_rec = 0;
1694
1695 fh = fc_frame_header_get(fp);
Robert Love74147052009-06-10 15:31:10 -07001696 FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl,
1697 fc_exch_rctl_name(fh->fh_r_ctl));
Robert Love42e9a922008-12-09 15:10:17 -08001698
Vasu Devb29a4f32012-07-06 10:40:10 -07001699 if (cancel_delayed_work_sync(&ep->timeout_work)) {
Robert Love3a292602013-06-11 07:28:09 +00001700 FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n");
Robert Love42e9a922008-12-09 15:10:17 -08001701 fc_exch_release(ep); /* release from pending timer hold */
Vasu Devb29a4f32012-07-06 10:40:10 -07001702 }
Robert Love42e9a922008-12-09 15:10:17 -08001703
1704 spin_lock_bh(&ep->ex_lock);
1705 switch (fh->fh_r_ctl) {
1706 case FC_RCTL_BA_ACC:
1707 ap = fc_frame_payload_get(fp, sizeof(*ap));
1708 if (!ap)
1709 break;
1710
1711 /*
1712 * Decide whether to establish a Recovery Qualifier.
1713 * We do this if there is a non-empty SEQ_CNT range and
1714 * SEQ_ID is the same as the one we aborted.
1715 */
1716 low = ntohs(ap->ba_low_seq_cnt);
1717 high = ntohs(ap->ba_high_seq_cnt);
1718 if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 &&
1719 (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL ||
1720 ap->ba_seq_id == ep->seq_id) && low != high) {
1721 ep->esb_stat |= ESB_ST_REC_QUAL;
1722 fc_exch_hold(ep); /* hold for recovery qualifier */
1723 has_rec = 1;
1724 }
1725 break;
1726 case FC_RCTL_BA_RJT:
1727 break;
1728 default:
1729 break;
1730 }
1731
Robert Love42e9a922008-12-09 15:10:17 -08001732 /* do we need to do some other checks here. Can we reuse more of
1733 * fc_exch_recv_seq_resp
1734 */
1735 sp = &ep->seq;
1736 /*
1737 * do we want to check END_SEQ as well as LAST_SEQ here?
1738 */
1739 if (ep->fh_type != FC_TYPE_FCP &&
1740 ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ)
1741 rc = fc_exch_done_locked(ep);
1742 spin_unlock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001743
1744 fc_exch_hold(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001745 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -07001746 fc_exch_delete(ep);
Bart Van Asschef6979ad2015-06-05 14:20:46 -07001747 if (!fc_invoke_resp(ep, sp, fp))
1748 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001749 if (has_rec)
1750 fc_exch_timer_set(ep, ep->r_a_tov);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001751 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001752}
1753
Robert Love3a3b42b2009-11-03 11:47:39 -08001754/**
1755 * fc_exch_recv_bls() - Handler for a BLS sequence
1756 * @mp: The EM that the exchange is on
1757 * @fp: The request frame
1758 *
1759 * The BLS frame is always a sequence initiated by the remote side.
Robert Love42e9a922008-12-09 15:10:17 -08001760 * We may be either the originator or recipient of the exchange.
1761 */
1762static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp)
1763{
1764 struct fc_frame_header *fh;
1765 struct fc_exch *ep;
1766 u32 f_ctl;
1767
1768 fh = fc_frame_header_get(fp);
1769 f_ctl = ntoh24(fh->fh_f_ctl);
1770 fr_seq(fp) = NULL;
1771
1772 ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ?
1773 ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id));
1774 if (ep && (f_ctl & FC_FC_SEQ_INIT)) {
1775 spin_lock_bh(&ep->ex_lock);
1776 ep->esb_stat |= ESB_ST_SEQ_INIT;
1777 spin_unlock_bh(&ep->ex_lock);
1778 }
1779 if (f_ctl & FC_FC_SEQ_CTX) {
1780 /*
1781 * A response to a sequence we initiated.
1782 * This should only be ACKs for class 2 or F.
1783 */
1784 switch (fh->fh_r_ctl) {
1785 case FC_RCTL_ACK_1:
1786 case FC_RCTL_ACK_0:
1787 break;
1788 default:
Bhanu Prakash Gollapudid4042e92012-02-10 17:18:51 -08001789 if (ep)
Bart Van Asscheb20d9bf2013-08-14 15:32:51 +00001790 FC_EXCH_DBG(ep, "BLS rctl %x - %s received\n",
Bhanu Prakash Gollapudid4042e92012-02-10 17:18:51 -08001791 fh->fh_r_ctl,
1792 fc_exch_rctl_name(fh->fh_r_ctl));
Robert Love42e9a922008-12-09 15:10:17 -08001793 break;
1794 }
1795 fc_frame_free(fp);
1796 } else {
1797 switch (fh->fh_r_ctl) {
1798 case FC_RCTL_BA_RJT:
1799 case FC_RCTL_BA_ACC:
1800 if (ep)
1801 fc_exch_abts_resp(ep, fp);
1802 else
1803 fc_frame_free(fp);
1804 break;
1805 case FC_RCTL_BA_ABTS:
Hannes Reineckeb73aa562016-10-13 15:10:49 +02001806 if (ep)
1807 fc_exch_recv_abts(ep, fp);
1808 else
1809 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08001810 break;
1811 default: /* ignore junk */
1812 fc_frame_free(fp);
1813 break;
1814 }
1815 }
1816 if (ep)
1817 fc_exch_release(ep); /* release hold taken by fc_exch_find */
1818}
1819
Robert Love3a3b42b2009-11-03 11:47:39 -08001820/**
1821 * fc_seq_ls_acc() - Accept sequence with LS_ACC
Joe Eykholt922611562010-07-20 15:21:12 -07001822 * @rx_fp: The received frame, not freed here.
Robert Love3a3b42b2009-11-03 11:47:39 -08001823 *
Robert Love42e9a922008-12-09 15:10:17 -08001824 * If this fails due to allocation or transmit congestion, assume the
1825 * originator will repeat the sequence.
1826 */
Joe Eykholt922611562010-07-20 15:21:12 -07001827static void fc_seq_ls_acc(struct fc_frame *rx_fp)
Robert Love42e9a922008-12-09 15:10:17 -08001828{
Joe Eykholt922611562010-07-20 15:21:12 -07001829 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08001830 struct fc_els_ls_acc *acc;
1831 struct fc_frame *fp;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001832 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -08001833
Joe Eykholt922611562010-07-20 15:21:12 -07001834 lport = fr_dev(rx_fp);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001835 sp = fr_seq(rx_fp);
Joe Eykholt922611562010-07-20 15:21:12 -07001836 fp = fc_frame_alloc(lport, sizeof(*acc));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001837 if (!fp) {
1838 FC_EXCH_DBG(fc_seq_exch(sp),
1839 "exch: drop LS_ACC, out of memory\n");
Joe Eykholt922611562010-07-20 15:21:12 -07001840 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001841 }
Joe Eykholt922611562010-07-20 15:21:12 -07001842 acc = fc_frame_payload_get(fp, sizeof(*acc));
1843 memset(acc, 0, sizeof(*acc));
1844 acc->la_cmd = ELS_LS_ACC;
1845 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1846 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001847}
1848
Robert Love3a3b42b2009-11-03 11:47:39 -08001849/**
1850 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
Joe Eykholt922611562010-07-20 15:21:12 -07001851 * @rx_fp: The received frame, not freed here.
Robert Love3a3b42b2009-11-03 11:47:39 -08001852 * @reason: The reason the sequence is being rejected
Joe Eykholt922611562010-07-20 15:21:12 -07001853 * @explan: The explanation for the rejection
Robert Love3a3b42b2009-11-03 11:47:39 -08001854 *
Robert Love42e9a922008-12-09 15:10:17 -08001855 * If this fails due to allocation or transmit congestion, assume the
1856 * originator will repeat the sequence.
1857 */
Joe Eykholt922611562010-07-20 15:21:12 -07001858static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason,
Robert Love42e9a922008-12-09 15:10:17 -08001859 enum fc_els_rjt_explan explan)
1860{
Joe Eykholt922611562010-07-20 15:21:12 -07001861 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08001862 struct fc_els_ls_rjt *rjt;
1863 struct fc_frame *fp;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001864 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -08001865
Joe Eykholt922611562010-07-20 15:21:12 -07001866 lport = fr_dev(rx_fp);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001867 sp = fr_seq(rx_fp);
Joe Eykholt922611562010-07-20 15:21:12 -07001868 fp = fc_frame_alloc(lport, sizeof(*rjt));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001869 if (!fp) {
1870 FC_EXCH_DBG(fc_seq_exch(sp),
1871 "exch: drop LS_ACC, out of memory\n");
Joe Eykholt922611562010-07-20 15:21:12 -07001872 return;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02001873 }
Joe Eykholt922611562010-07-20 15:21:12 -07001874 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1875 memset(rjt, 0, sizeof(*rjt));
1876 rjt->er_cmd = ELS_LS_RJT;
1877 rjt->er_reason = reason;
1878 rjt->er_explan = explan;
1879 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1880 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08001881}
1882
Robert Love3a3b42b2009-11-03 11:47:39 -08001883/**
1884 * fc_exch_reset() - Reset an exchange
1885 * @ep: The exchange to be reset
Bart Van Assche7030fd62013-08-17 20:34:43 +00001886 *
1887 * Note: May sleep if invoked from outside a response handler.
Robert Love3a3b42b2009-11-03 11:47:39 -08001888 */
Robert Love42e9a922008-12-09 15:10:17 -08001889static void fc_exch_reset(struct fc_exch *ep)
1890{
1891 struct fc_seq *sp;
Robert Love42e9a922008-12-09 15:10:17 -08001892 int rc = 1;
1893
1894 spin_lock_bh(&ep->ex_lock);
1895 ep->state |= FC_EX_RST_CLEANUP;
Vasu Devb29a4f32012-07-06 10:40:10 -07001896 fc_exch_timer_cancel(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001897 if (ep->esb_stat & ESB_ST_REC_QUAL)
1898 atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */
1899 ep->esb_stat &= ~ESB_ST_REC_QUAL;
Robert Love42e9a922008-12-09 15:10:17 -08001900 sp = &ep->seq;
1901 rc = fc_exch_done_locked(ep);
1902 spin_unlock_bh(&ep->ex_lock);
Bart Van Assche7030fd62013-08-17 20:34:43 +00001903
1904 fc_exch_hold(ep);
1905
Robert Love42e9a922008-12-09 15:10:17 -08001906 if (!rc)
Vasu Devb2f00912009-08-25 13:58:53 -07001907 fc_exch_delete(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001908
Bart Van Assche7030fd62013-08-17 20:34:43 +00001909 fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED));
1910 fc_seq_set_resp(sp, NULL, ep->arg);
1911 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001912}
1913
Vasu Devb2f00912009-08-25 13:58:53 -07001914/**
Robert Love3a3b42b2009-11-03 11:47:39 -08001915 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1916 * @lport: The local port that the exchange pool is on
1917 * @pool: The exchange pool to be reset
1918 * @sid: The source ID
1919 * @did: The destination ID
Vasu Devb2f00912009-08-25 13:58:53 -07001920 *
Robert Love3a3b42b2009-11-03 11:47:39 -08001921 * Resets a per cpu exches pool, releasing all of its sequences
1922 * and exchanges. If sid is non-zero then reset only exchanges
1923 * we sourced from the local port's FID. If did is non-zero then
1924 * only reset exchanges destined for the local port's FID.
Robert Love42e9a922008-12-09 15:10:17 -08001925 */
Vasu Devb2f00912009-08-25 13:58:53 -07001926static void fc_exch_pool_reset(struct fc_lport *lport,
1927 struct fc_exch_pool *pool,
1928 u32 sid, u32 did)
Robert Love42e9a922008-12-09 15:10:17 -08001929{
1930 struct fc_exch *ep;
1931 struct fc_exch *next;
Robert Love42e9a922008-12-09 15:10:17 -08001932
Vasu Devb2f00912009-08-25 13:58:53 -07001933 spin_lock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -08001934restart:
Vasu Devb2f00912009-08-25 13:58:53 -07001935 list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) {
1936 if ((lport == ep->lp) &&
1937 (sid == 0 || sid == ep->sid) &&
1938 (did == 0 || did == ep->did)) {
1939 fc_exch_hold(ep);
1940 spin_unlock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -08001941
Vasu Devb2f00912009-08-25 13:58:53 -07001942 fc_exch_reset(ep);
Robert Love42e9a922008-12-09 15:10:17 -08001943
Vasu Devb2f00912009-08-25 13:58:53 -07001944 fc_exch_release(ep);
1945 spin_lock_bh(&pool->lock);
Robert Love42e9a922008-12-09 15:10:17 -08001946
Vasu Devb2f00912009-08-25 13:58:53 -07001947 /*
1948 * must restart loop incase while lock
1949 * was down multiple eps were released.
1950 */
1951 goto restart;
Robert Love42e9a922008-12-09 15:10:17 -08001952 }
Vasu Devb2f00912009-08-25 13:58:53 -07001953 }
Vasu Devb6e3c842011-10-28 11:34:17 -07001954 pool->next_index = 0;
1955 pool->left = FC_XID_UNKNOWN;
1956 pool->right = FC_XID_UNKNOWN;
Vasu Devb2f00912009-08-25 13:58:53 -07001957 spin_unlock_bh(&pool->lock);
1958}
1959
1960/**
Robert Love3a3b42b2009-11-03 11:47:39 -08001961 * fc_exch_mgr_reset() - Reset all EMs of a local port
1962 * @lport: The local port whose EMs are to be reset
1963 * @sid: The source ID
1964 * @did: The destination ID
Vasu Devb2f00912009-08-25 13:58:53 -07001965 *
Robert Love3a3b42b2009-11-03 11:47:39 -08001966 * Reset all EMs associated with a given local port. Release all
1967 * sequences and exchanges. If sid is non-zero then reset only the
1968 * exchanges sent from the local port's FID. If did is non-zero then
1969 * reset only exchanges destined for the local port's FID.
Vasu Devb2f00912009-08-25 13:58:53 -07001970 */
1971void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did)
1972{
1973 struct fc_exch_mgr_anchor *ema;
1974 unsigned int cpu;
1975
1976 list_for_each_entry(ema, &lport->ema_list, ema_list) {
1977 for_each_possible_cpu(cpu)
1978 fc_exch_pool_reset(lport,
1979 per_cpu_ptr(ema->mp->pool, cpu),
1980 sid, did);
Robert Love42e9a922008-12-09 15:10:17 -08001981 }
Robert Love42e9a922008-12-09 15:10:17 -08001982}
1983EXPORT_SYMBOL(fc_exch_mgr_reset);
1984
Robert Love3a3b42b2009-11-03 11:47:39 -08001985/**
Joe Eykholt922611562010-07-20 15:21:12 -07001986 * fc_exch_lookup() - find an exchange
1987 * @lport: The local port
1988 * @xid: The exchange ID
1989 *
1990 * Returns exchange pointer with hold for caller, or NULL if not found.
1991 */
1992static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid)
1993{
1994 struct fc_exch_mgr_anchor *ema;
1995
1996 list_for_each_entry(ema, &lport->ema_list, ema_list)
1997 if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid)
1998 return fc_exch_find(ema->mp, xid);
1999 return NULL;
2000}
2001
2002/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002003 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
Joe Eykholt922611562010-07-20 15:21:12 -07002004 * @rfp: The REC frame, not freed here.
Robert Love3a3b42b2009-11-03 11:47:39 -08002005 *
Robert Love42e9a922008-12-09 15:10:17 -08002006 * Note that the requesting port may be different than the S_ID in the request.
2007 */
Joe Eykholt922611562010-07-20 15:21:12 -07002008static void fc_exch_els_rec(struct fc_frame *rfp)
Robert Love42e9a922008-12-09 15:10:17 -08002009{
Joe Eykholt922611562010-07-20 15:21:12 -07002010 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08002011 struct fc_frame *fp;
2012 struct fc_exch *ep;
Robert Love42e9a922008-12-09 15:10:17 -08002013 struct fc_els_rec *rp;
2014 struct fc_els_rec_acc *acc;
2015 enum fc_els_rjt_reason reason = ELS_RJT_LOGIC;
2016 enum fc_els_rjt_explan explan;
2017 u32 sid;
Hannes Reineckee0a25282016-10-13 15:10:55 +02002018 u16 xid, rxid, oxid;
Robert Love42e9a922008-12-09 15:10:17 -08002019
Joe Eykholt922611562010-07-20 15:21:12 -07002020 lport = fr_dev(rfp);
Robert Love42e9a922008-12-09 15:10:17 -08002021 rp = fc_frame_payload_get(rfp, sizeof(*rp));
2022 explan = ELS_EXPL_INV_LEN;
2023 if (!rp)
2024 goto reject;
2025 sid = ntoh24(rp->rec_s_id);
2026 rxid = ntohs(rp->rec_rx_id);
2027 oxid = ntohs(rp->rec_ox_id);
2028
Robert Love42e9a922008-12-09 15:10:17 -08002029 explan = ELS_EXPL_OXID_RXID;
Hannes Reineckee0a25282016-10-13 15:10:55 +02002030 if (sid == fc_host_port_id(lport->host))
2031 xid = oxid;
2032 else
2033 xid = rxid;
2034 if (xid == FC_XID_UNKNOWN) {
2035 FC_LPORT_DBG(lport,
2036 "REC request from %x: invalid rxid %x oxid %x\n",
2037 sid, rxid, oxid);
2038 goto reject;
2039 }
2040 ep = fc_exch_lookup(lport, xid);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002041 if (!ep) {
2042 FC_LPORT_DBG(lport,
2043 "REC request from %x: rxid %x oxid %x not found\n",
2044 sid, rxid, oxid);
Joe Eykholt922611562010-07-20 15:21:12 -07002045 goto reject;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002046 }
2047 FC_EXCH_DBG(ep, "REC request from %x: rxid %x oxid %x\n",
2048 sid, rxid, oxid);
Joe Eykholt922611562010-07-20 15:21:12 -07002049 if (ep->oid != sid || oxid != ep->oxid)
2050 goto rel;
2051 if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid)
2052 goto rel;
2053 fp = fc_frame_alloc(lport, sizeof(*acc));
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002054 if (!fp) {
2055 FC_EXCH_DBG(ep, "Drop REC request, out of memory\n");
Robert Love42e9a922008-12-09 15:10:17 -08002056 goto out;
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002057 }
Joe Eykholt922611562010-07-20 15:21:12 -07002058
Robert Love42e9a922008-12-09 15:10:17 -08002059 acc = fc_frame_payload_get(fp, sizeof(*acc));
2060 memset(acc, 0, sizeof(*acc));
2061 acc->reca_cmd = ELS_LS_ACC;
2062 acc->reca_ox_id = rp->rec_ox_id;
2063 memcpy(acc->reca_ofid, rp->rec_s_id, 3);
2064 acc->reca_rx_id = htons(ep->rxid);
2065 if (ep->sid == ep->oid)
2066 hton24(acc->reca_rfid, ep->did);
2067 else
2068 hton24(acc->reca_rfid, ep->sid);
2069 acc->reca_fc4value = htonl(ep->seq.rec_data);
2070 acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP |
2071 ESB_ST_SEQ_INIT |
2072 ESB_ST_COMPLETE));
Joe Eykholt922611562010-07-20 15:21:12 -07002073 fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0);
2074 lport->tt.frame_send(lport, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002075out:
2076 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08002077 return;
2078
2079rel:
2080 fc_exch_release(ep);
2081reject:
Joe Eykholt922611562010-07-20 15:21:12 -07002082 fc_seq_ls_rjt(rfp, reason, explan);
Robert Love42e9a922008-12-09 15:10:17 -08002083}
2084
Robert Love3a3b42b2009-11-03 11:47:39 -08002085/**
2086 * fc_exch_rrq_resp() - Handler for RRQ responses
2087 * @sp: The sequence that the RRQ is on
2088 * @fp: The RRQ frame
2089 * @arg: The exchange that the RRQ is on
Robert Love42e9a922008-12-09 15:10:17 -08002090 *
2091 * TODO: fix error handler.
2092 */
2093static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
2094{
2095 struct fc_exch *aborted_ep = arg;
2096 unsigned int op;
2097
2098 if (IS_ERR(fp)) {
2099 int err = PTR_ERR(fp);
2100
Vasu Dev78342da2009-02-27 10:54:46 -08002101 if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT)
Robert Love42e9a922008-12-09 15:10:17 -08002102 goto cleanup;
Robert Love74147052009-06-10 15:31:10 -07002103 FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, "
2104 "frame error %d\n", err);
Robert Love42e9a922008-12-09 15:10:17 -08002105 return;
2106 }
2107
2108 op = fc_frame_payload_op(fp);
2109 fc_frame_free(fp);
2110
2111 switch (op) {
2112 case ELS_LS_RJT:
Bart Van Asscheb20d9bf2013-08-14 15:32:51 +00002113 FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ\n");
Robert Love42e9a922008-12-09 15:10:17 -08002114 /* fall through */
2115 case ELS_LS_ACC:
2116 goto cleanup;
2117 default:
Bart Van Asscheb20d9bf2013-08-14 15:32:51 +00002118 FC_EXCH_DBG(aborted_ep, "unexpected response op %x for RRQ\n",
2119 op);
Robert Love42e9a922008-12-09 15:10:17 -08002120 return;
2121 }
2122
2123cleanup:
2124 fc_exch_done(&aborted_ep->seq);
2125 /* drop hold for rec qual */
2126 fc_exch_release(aborted_ep);
2127}
2128
Robert Love1a7b75a2009-11-03 11:45:47 -08002129
2130/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002131 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
2132 * @lport: The local port to send the frame on
2133 * @fp: The frame to be sent
2134 * @resp: The response handler for this request
2135 * @destructor: The destructor for the exchange
2136 * @arg: The argument to be passed to the response handler
2137 * @timer_msec: The timeout period for the exchange
2138 *
Hannes Reinecke3afd2d12016-10-18 10:01:38 +02002139 * The exchange response handler is set in this routine to resp()
2140 * function pointer. It can be called in two scenarios: if a timeout
2141 * occurs or if a response frame is received for the exchange. The
2142 * fc_frame pointer in response handler will also indicate timeout
2143 * as error using IS_ERR related macros.
2144 *
2145 * The exchange destructor handler is also set in this routine.
2146 * The destructor handler is invoked by EM layer when exchange
2147 * is about to free, this can be used by caller to free its
2148 * resources along with exchange free.
2149 *
2150 * The arg is passed back to resp and destructor handler.
2151 *
2152 * The timeout value (in msec) for an exchange is set if non zero
2153 * timer_msec argument is specified. The timer is canceled when
2154 * it fires or when the exchange is done. The exchange timeout handler
2155 * is registered by EM layer.
2156 *
Robert Love3a3b42b2009-11-03 11:47:39 -08002157 * The frame pointer with some of the header's fields must be
2158 * filled before calling this routine, those fields are:
2159 *
2160 * - routing control
2161 * - FC port did
2162 * - FC port sid
2163 * - FC header type
2164 * - frame control
2165 * - parameter or relative offset
Robert Love1a7b75a2009-11-03 11:45:47 -08002166 */
Hannes Reinecke3afd2d12016-10-18 10:01:38 +02002167struct fc_seq *fc_exch_seq_send(struct fc_lport *lport,
2168 struct fc_frame *fp,
2169 void (*resp)(struct fc_seq *,
2170 struct fc_frame *fp,
2171 void *arg),
2172 void (*destructor)(struct fc_seq *, void *),
2173 void *arg, u32 timer_msec)
Robert Love1a7b75a2009-11-03 11:45:47 -08002174{
2175 struct fc_exch *ep;
2176 struct fc_seq *sp = NULL;
2177 struct fc_frame_header *fh;
Yi Zou3ee17f52011-08-25 12:41:03 -07002178 struct fc_fcp_pkt *fsp = NULL;
Robert Love1a7b75a2009-11-03 11:45:47 -08002179 int rc = 1;
2180
Robert Love3a3b42b2009-11-03 11:47:39 -08002181 ep = fc_exch_alloc(lport, fp);
Robert Love1a7b75a2009-11-03 11:45:47 -08002182 if (!ep) {
2183 fc_frame_free(fp);
2184 return NULL;
2185 }
2186 ep->esb_stat |= ESB_ST_SEQ_INIT;
2187 fh = fc_frame_header_get(fp);
2188 fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id));
2189 ep->resp = resp;
2190 ep->destructor = destructor;
2191 ep->arg = arg;
Hannes Reineckef7ce4132016-10-13 15:10:39 +02002192 ep->r_a_tov = lport->r_a_tov;
Robert Love3a3b42b2009-11-03 11:47:39 -08002193 ep->lp = lport;
Robert Love1a7b75a2009-11-03 11:45:47 -08002194 sp = &ep->seq;
2195
2196 ep->fh_type = fh->fh_type; /* save for possbile timeout handling */
2197 ep->f_ctl = ntoh24(fh->fh_f_ctl);
2198 fc_exch_setup_hdr(ep, fp, ep->f_ctl);
2199 sp->cnt++;
2200
Yi Zou3ee17f52011-08-25 12:41:03 -07002201 if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) {
2202 fsp = fr_fsp(fp);
Robert Love1a7b75a2009-11-03 11:45:47 -08002203 fc_fcp_ddp_setup(fr_fsp(fp), ep->xid);
Yi Zou3ee17f52011-08-25 12:41:03 -07002204 }
Robert Love1a7b75a2009-11-03 11:45:47 -08002205
Robert Love3a3b42b2009-11-03 11:47:39 -08002206 if (unlikely(lport->tt.frame_send(lport, fp)))
Robert Love1a7b75a2009-11-03 11:45:47 -08002207 goto err;
2208
2209 if (timer_msec)
2210 fc_exch_timer_set_locked(ep, timer_msec);
2211 ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */
2212
2213 if (ep->f_ctl & FC_FC_SEQ_INIT)
2214 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
2215 spin_unlock_bh(&ep->ex_lock);
2216 return sp;
2217err:
Yi Zou3ee17f52011-08-25 12:41:03 -07002218 if (fsp)
2219 fc_fcp_ddp_done(fsp);
Robert Love1a7b75a2009-11-03 11:45:47 -08002220 rc = fc_exch_done_locked(ep);
2221 spin_unlock_bh(&ep->ex_lock);
2222 if (!rc)
2223 fc_exch_delete(ep);
2224 return NULL;
2225}
Hannes Reinecke3afd2d12016-10-18 10:01:38 +02002226EXPORT_SYMBOL(fc_exch_seq_send);
Robert Love1a7b75a2009-11-03 11:45:47 -08002227
Robert Love3a3b42b2009-11-03 11:47:39 -08002228/**
2229 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
2230 * @ep: The exchange to send the RRQ on
2231 *
Robert Love42e9a922008-12-09 15:10:17 -08002232 * This tells the remote port to stop blocking the use of
2233 * the exchange and the seq_cnt range.
2234 */
2235static void fc_exch_rrq(struct fc_exch *ep)
2236{
Robert Love3a3b42b2009-11-03 11:47:39 -08002237 struct fc_lport *lport;
Robert Love42e9a922008-12-09 15:10:17 -08002238 struct fc_els_rrq *rrq;
2239 struct fc_frame *fp;
Robert Love42e9a922008-12-09 15:10:17 -08002240 u32 did;
2241
Robert Love3a3b42b2009-11-03 11:47:39 -08002242 lport = ep->lp;
Robert Love42e9a922008-12-09 15:10:17 -08002243
Robert Love3a3b42b2009-11-03 11:47:39 -08002244 fp = fc_frame_alloc(lport, sizeof(*rrq));
Robert Love42e9a922008-12-09 15:10:17 -08002245 if (!fp)
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002246 goto retry;
2247
Robert Love42e9a922008-12-09 15:10:17 -08002248 rrq = fc_frame_payload_get(fp, sizeof(*rrq));
2249 memset(rrq, 0, sizeof(*rrq));
2250 rrq->rrq_cmd = ELS_RRQ;
2251 hton24(rrq->rrq_s_id, ep->sid);
2252 rrq->rrq_ox_id = htons(ep->oxid);
2253 rrq->rrq_rx_id = htons(ep->rxid);
2254
2255 did = ep->did;
2256 if (ep->esb_stat & ESB_ST_RESP)
2257 did = ep->sid;
2258
2259 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did,
Robert Love7b2787e2010-05-07 15:18:41 -07002260 lport->port_id, FC_TYPE_ELS,
Robert Love42e9a922008-12-09 15:10:17 -08002261 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
2262
Robert Love3a3b42b2009-11-03 11:47:39 -08002263 if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep,
2264 lport->e_d_tov))
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002265 return;
2266
2267retry:
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002268 FC_EXCH_DBG(ep, "exch: RRQ send failed\n");
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002269 spin_lock_bh(&ep->ex_lock);
2270 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) {
2271 spin_unlock_bh(&ep->ex_lock);
2272 /* drop hold for rec qual */
2273 fc_exch_release(ep);
Robert Love42e9a922008-12-09 15:10:17 -08002274 return;
2275 }
Vasu Deva0cc1ec2009-07-28 17:33:37 -07002276 ep->esb_stat |= ESB_ST_REC_QUAL;
2277 fc_exch_timer_set_locked(ep, ep->r_a_tov);
2278 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08002279}
2280
Robert Love3a3b42b2009-11-03 11:47:39 -08002281/**
2282 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
Joe Eykholt922611562010-07-20 15:21:12 -07002283 * @fp: The RRQ frame, not freed here.
Robert Love42e9a922008-12-09 15:10:17 -08002284 */
Joe Eykholt922611562010-07-20 15:21:12 -07002285static void fc_exch_els_rrq(struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -08002286{
Joe Eykholt922611562010-07-20 15:21:12 -07002287 struct fc_lport *lport;
Vasu Dev3f127ad2009-10-21 16:27:33 -07002288 struct fc_exch *ep = NULL; /* request or subject exchange */
Robert Love42e9a922008-12-09 15:10:17 -08002289 struct fc_els_rrq *rp;
2290 u32 sid;
2291 u16 xid;
2292 enum fc_els_rjt_explan explan;
2293
Joe Eykholt922611562010-07-20 15:21:12 -07002294 lport = fr_dev(fp);
Robert Love42e9a922008-12-09 15:10:17 -08002295 rp = fc_frame_payload_get(fp, sizeof(*rp));
2296 explan = ELS_EXPL_INV_LEN;
2297 if (!rp)
2298 goto reject;
2299
2300 /*
2301 * lookup subject exchange.
2302 */
Robert Love42e9a922008-12-09 15:10:17 -08002303 sid = ntoh24(rp->rrq_s_id); /* subject source */
Joe Eykholt922611562010-07-20 15:21:12 -07002304 xid = fc_host_port_id(lport->host) == sid ?
2305 ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id);
2306 ep = fc_exch_lookup(lport, xid);
Robert Love42e9a922008-12-09 15:10:17 -08002307 explan = ELS_EXPL_OXID_RXID;
2308 if (!ep)
2309 goto reject;
2310 spin_lock_bh(&ep->ex_lock);
Hannes Reinecke57d3ec7e2016-10-13 15:10:37 +02002311 FC_EXCH_DBG(ep, "RRQ request from %x: xid %x rxid %x oxid %x\n",
2312 sid, xid, ntohs(rp->rrq_rx_id), ntohs(rp->rrq_ox_id));
Robert Love42e9a922008-12-09 15:10:17 -08002313 if (ep->oxid != ntohs(rp->rrq_ox_id))
2314 goto unlock_reject;
2315 if (ep->rxid != ntohs(rp->rrq_rx_id) &&
2316 ep->rxid != FC_XID_UNKNOWN)
2317 goto unlock_reject;
2318 explan = ELS_EXPL_SID;
2319 if (ep->sid != sid)
2320 goto unlock_reject;
2321
2322 /*
2323 * Clear Recovery Qualifier state, and cancel timer if complete.
2324 */
2325 if (ep->esb_stat & ESB_ST_REC_QUAL) {
2326 ep->esb_stat &= ~ESB_ST_REC_QUAL;
2327 atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */
2328 }
Vasu Devb29a4f32012-07-06 10:40:10 -07002329 if (ep->esb_stat & ESB_ST_COMPLETE)
2330 fc_exch_timer_cancel(ep);
Robert Love42e9a922008-12-09 15:10:17 -08002331
2332 spin_unlock_bh(&ep->ex_lock);
2333
2334 /*
2335 * Send LS_ACC.
2336 */
Joe Eykholt922611562010-07-20 15:21:12 -07002337 fc_seq_ls_acc(fp);
Vasu Dev3f127ad2009-10-21 16:27:33 -07002338 goto out;
Robert Love42e9a922008-12-09 15:10:17 -08002339
2340unlock_reject:
2341 spin_unlock_bh(&ep->ex_lock);
Robert Love42e9a922008-12-09 15:10:17 -08002342reject:
Joe Eykholt922611562010-07-20 15:21:12 -07002343 fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan);
Vasu Dev3f127ad2009-10-21 16:27:33 -07002344out:
Vasu Dev3f127ad2009-10-21 16:27:33 -07002345 if (ep)
2346 fc_exch_release(ep); /* drop hold from fc_exch_find */
Robert Love42e9a922008-12-09 15:10:17 -08002347}
2348
Robert Love3a3b42b2009-11-03 11:47:39 -08002349/**
Vasu Dev4e5fae72012-05-25 10:26:54 -07002350 * fc_exch_update_stats() - update exches stats to lport
2351 * @lport: The local port to update exchange manager stats
2352 */
2353void fc_exch_update_stats(struct fc_lport *lport)
2354{
2355 struct fc_host_statistics *st;
2356 struct fc_exch_mgr_anchor *ema;
2357 struct fc_exch_mgr *mp;
2358
2359 st = &lport->host_stats;
2360
2361 list_for_each_entry(ema, &lport->ema_list, ema_list) {
2362 mp = ema->mp;
2363 st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch);
2364 st->fc_no_free_exch_xid +=
2365 atomic_read(&mp->stats.no_free_exch_xid);
2366 st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found);
2367 st->fc_xid_busy += atomic_read(&mp->stats.xid_busy);
2368 st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found);
2369 st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp);
2370 }
2371}
2372EXPORT_SYMBOL(fc_exch_update_stats);
2373
2374/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002375 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
2376 * @lport: The local port to add the exchange manager to
2377 * @mp: The exchange manager to be added to the local port
2378 * @match: The match routine that indicates when this EM should be used
2379 */
Vasu Dev96316092009-07-29 17:05:00 -07002380struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
2381 struct fc_exch_mgr *mp,
2382 bool (*match)(struct fc_frame *))
2383{
2384 struct fc_exch_mgr_anchor *ema;
2385
2386 ema = kmalloc(sizeof(*ema), GFP_ATOMIC);
2387 if (!ema)
2388 return ema;
2389
2390 ema->mp = mp;
2391 ema->match = match;
2392 /* add EM anchor to EM anchors list */
2393 list_add_tail(&ema->ema_list, &lport->ema_list);
2394 kref_get(&mp->kref);
2395 return ema;
2396}
2397EXPORT_SYMBOL(fc_exch_mgr_add);
2398
Robert Love3a3b42b2009-11-03 11:47:39 -08002399/**
2400 * fc_exch_mgr_destroy() - Destroy an exchange manager
2401 * @kref: The reference to the EM to be destroyed
2402 */
Vasu Dev96316092009-07-29 17:05:00 -07002403static void fc_exch_mgr_destroy(struct kref *kref)
2404{
2405 struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref);
2406
Vasu Dev96316092009-07-29 17:05:00 -07002407 mempool_destroy(mp->ep_pool);
Vasu Deve4bc50b2009-08-25 13:58:47 -07002408 free_percpu(mp->pool);
Vasu Dev96316092009-07-29 17:05:00 -07002409 kfree(mp);
2410}
2411
Robert Love3a3b42b2009-11-03 11:47:39 -08002412/**
2413 * fc_exch_mgr_del() - Delete an EM from a local port's list
2414 * @ema: The exchange manager anchor identifying the EM to be deleted
2415 */
Vasu Dev96316092009-07-29 17:05:00 -07002416void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema)
2417{
2418 /* remove EM anchor from EM anchors list */
2419 list_del(&ema->ema_list);
2420 kref_put(&ema->mp->kref, fc_exch_mgr_destroy);
2421 kfree(ema);
2422}
2423EXPORT_SYMBOL(fc_exch_mgr_del);
2424
Chris Leech174e1eb2009-11-03 11:46:14 -08002425/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002426 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2427 * @src: Source lport to clone exchange managers from
2428 * @dst: New lport that takes references to all the exchange managers
Chris Leech174e1eb2009-11-03 11:46:14 -08002429 */
2430int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst)
2431{
2432 struct fc_exch_mgr_anchor *ema, *tmp;
2433
2434 list_for_each_entry(ema, &src->ema_list, ema_list) {
2435 if (!fc_exch_mgr_add(dst, ema->mp, ema->match))
2436 goto err;
2437 }
2438 return 0;
2439err:
2440 list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list)
2441 fc_exch_mgr_del(ema);
2442 return -ENOMEM;
2443}
Vasu Dev72fa3962011-02-25 15:03:01 -08002444EXPORT_SYMBOL(fc_exch_mgr_list_clone);
Chris Leech174e1eb2009-11-03 11:46:14 -08002445
Robert Love3a3b42b2009-11-03 11:47:39 -08002446/**
2447 * fc_exch_mgr_alloc() - Allocate an exchange manager
2448 * @lport: The local port that the new EM will be associated with
2449 * @class: The default FC class for new exchanges
2450 * @min_xid: The minimum XID for exchanges from the new EM
2451 * @max_xid: The maximum XID for exchanges from the new EM
2452 * @match: The match routine for the new EM
2453 */
2454struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport,
Robert Love42e9a922008-12-09 15:10:17 -08002455 enum fc_class class,
Vasu Dev52ff8782009-07-29 17:05:10 -07002456 u16 min_xid, u16 max_xid,
2457 bool (*match)(struct fc_frame *))
Robert Love42e9a922008-12-09 15:10:17 -08002458{
2459 struct fc_exch_mgr *mp;
Vasu Deve4bc50b2009-08-25 13:58:47 -07002460 u16 pool_exch_range;
2461 size_t pool_size;
2462 unsigned int cpu;
2463 struct fc_exch_pool *pool;
Robert Love42e9a922008-12-09 15:10:17 -08002464
Vasu Deve4bc50b2009-08-25 13:58:47 -07002465 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN ||
2466 (min_xid & fc_cpu_mask) != 0) {
Robert Love3a3b42b2009-11-03 11:47:39 -08002467 FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
Robert Love74147052009-06-10 15:31:10 -07002468 min_xid, max_xid);
Robert Love42e9a922008-12-09 15:10:17 -08002469 return NULL;
2470 }
2471
2472 /*
Vasu Devb2f00912009-08-25 13:58:53 -07002473 * allocate memory for EM
Robert Love42e9a922008-12-09 15:10:17 -08002474 */
Vasu Devb2f00912009-08-25 13:58:53 -07002475 mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC);
Robert Love42e9a922008-12-09 15:10:17 -08002476 if (!mp)
2477 return NULL;
2478
2479 mp->class = class;
Hannes Reinecke9ca1e182016-10-13 15:10:50 +02002480 mp->lport = lport;
Robert Love42e9a922008-12-09 15:10:17 -08002481 /* adjust em exch xid range for offload */
2482 mp->min_xid = min_xid;
Steven Clark011a9002012-03-09 14:50:30 -08002483
2484 /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */
2485 pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) /
2486 sizeof(struct fc_exch *);
2487 if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) {
2488 mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) +
2489 min_xid - 1;
2490 } else {
2491 mp->max_xid = max_xid;
2492 pool_exch_range = (mp->max_xid - mp->min_xid + 1) /
2493 (fc_cpu_mask + 1);
2494 }
Robert Love42e9a922008-12-09 15:10:17 -08002495
2496 mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
2497 if (!mp->ep_pool)
2498 goto free_mp;
2499
Vasu Deve4bc50b2009-08-25 13:58:47 -07002500 /*
2501 * Setup per cpu exch pool with entire exchange id range equally
2502 * divided across all cpus. The exch pointers array memory is
2503 * allocated for exch range per pool.
2504 */
Vasu Deve4bc50b2009-08-25 13:58:47 -07002505 mp->pool_max_index = pool_exch_range - 1;
2506
2507 /*
2508 * Allocate and initialize per cpu exch pool
2509 */
2510 pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *);
2511 mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool));
2512 if (!mp->pool)
2513 goto free_mempool;
2514 for_each_possible_cpu(cpu) {
2515 pool = per_cpu_ptr(mp->pool, cpu);
Vasu Devb6e3c842011-10-28 11:34:17 -07002516 pool->next_index = 0;
Hillf Danton2034c192010-11-30 16:18:17 -08002517 pool->left = FC_XID_UNKNOWN;
2518 pool->right = FC_XID_UNKNOWN;
Vasu Deve4bc50b2009-08-25 13:58:47 -07002519 spin_lock_init(&pool->lock);
2520 INIT_LIST_HEAD(&pool->ex_list);
2521 }
2522
Vasu Dev52ff8782009-07-29 17:05:10 -07002523 kref_init(&mp->kref);
Robert Love3a3b42b2009-11-03 11:47:39 -08002524 if (!fc_exch_mgr_add(lport, mp, match)) {
Vasu Deve4bc50b2009-08-25 13:58:47 -07002525 free_percpu(mp->pool);
2526 goto free_mempool;
Vasu Dev52ff8782009-07-29 17:05:10 -07002527 }
2528
2529 /*
2530 * Above kref_init() sets mp->kref to 1 and then
2531 * call to fc_exch_mgr_add incremented mp->kref again,
2532 * so adjust that extra increment.
2533 */
2534 kref_put(&mp->kref, fc_exch_mgr_destroy);
Robert Love42e9a922008-12-09 15:10:17 -08002535 return mp;
2536
Vasu Deve4bc50b2009-08-25 13:58:47 -07002537free_mempool:
2538 mempool_destroy(mp->ep_pool);
Robert Love42e9a922008-12-09 15:10:17 -08002539free_mp:
2540 kfree(mp);
2541 return NULL;
2542}
2543EXPORT_SYMBOL(fc_exch_mgr_alloc);
2544
Robert Love3a3b42b2009-11-03 11:47:39 -08002545/**
2546 * fc_exch_mgr_free() - Free all exchange managers on a local port
2547 * @lport: The local port whose EMs are to be freed
2548 */
Vasu Dev52ff8782009-07-29 17:05:10 -07002549void fc_exch_mgr_free(struct fc_lport *lport)
Robert Love42e9a922008-12-09 15:10:17 -08002550{
Vasu Dev52ff8782009-07-29 17:05:10 -07002551 struct fc_exch_mgr_anchor *ema, *next;
2552
Vasu Dev4ae1e192009-11-03 11:50:10 -08002553 flush_workqueue(fc_exch_workqueue);
Vasu Dev52ff8782009-07-29 17:05:10 -07002554 list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list)
2555 fc_exch_mgr_del(ema);
Robert Love42e9a922008-12-09 15:10:17 -08002556}
2557EXPORT_SYMBOL(fc_exch_mgr_free);
2558
Robert Love3a3b42b2009-11-03 11:47:39 -08002559/**
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002560 * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending
2561 * upon 'xid'.
2562 * @f_ctl: f_ctl
2563 * @lport: The local port the frame was received on
2564 * @fh: The received frame header
2565 */
2566static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl,
2567 struct fc_lport *lport,
2568 struct fc_frame_header *fh)
2569{
2570 struct fc_exch_mgr_anchor *ema;
2571 u16 xid;
2572
2573 if (f_ctl & FC_FC_EX_CTX)
2574 xid = ntohs(fh->fh_ox_id);
2575 else {
2576 xid = ntohs(fh->fh_rx_id);
2577 if (xid == FC_XID_UNKNOWN)
2578 return list_entry(lport->ema_list.prev,
2579 typeof(*ema), ema_list);
2580 }
2581
2582 list_for_each_entry(ema, &lport->ema_list, ema_list) {
2583 if ((xid >= ema->mp->min_xid) &&
2584 (xid <= ema->mp->max_xid))
2585 return ema;
2586 }
2587 return NULL;
2588}
2589/**
Robert Love3a3b42b2009-11-03 11:47:39 -08002590 * fc_exch_recv() - Handler for received frames
2591 * @lport: The local port the frame was received on
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002592 * @fp: The received frame
Robert Love42e9a922008-12-09 15:10:17 -08002593 */
Robert Love3a3b42b2009-11-03 11:47:39 -08002594void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp)
Robert Love42e9a922008-12-09 15:10:17 -08002595{
2596 struct fc_frame_header *fh = fc_frame_header_get(fp);
Vasu Dev52ff8782009-07-29 17:05:10 -07002597 struct fc_exch_mgr_anchor *ema;
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002598 u32 f_ctl;
Robert Love42e9a922008-12-09 15:10:17 -08002599
2600 /* lport lock ? */
Robert Love3a3b42b2009-11-03 11:47:39 -08002601 if (!lport || lport->state == LPORT_ST_DISABLED) {
2602 FC_LPORT_DBG(lport, "Receiving frames for an lport that "
Robert Love74147052009-06-10 15:31:10 -07002603 "has not been initialized correctly\n");
Robert Love42e9a922008-12-09 15:10:17 -08002604 fc_frame_free(fp);
2605 return;
2606 }
2607
Vasu Dev52ff8782009-07-29 17:05:10 -07002608 f_ctl = ntoh24(fh->fh_f_ctl);
Kiran Patil6c8cc1c2011-01-28 16:04:39 -08002609 ema = fc_find_ema(f_ctl, lport, fh);
2610 if (!ema) {
2611 FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor,"
2612 "fc_ctl <0x%x>, xid <0x%x>\n",
2613 f_ctl,
2614 (f_ctl & FC_FC_EX_CTX) ?
2615 ntohs(fh->fh_ox_id) :
2616 ntohs(fh->fh_rx_id));
2617 fc_frame_free(fp);
2618 return;
2619 }
Vasu Dev52ff8782009-07-29 17:05:10 -07002620
Robert Love42e9a922008-12-09 15:10:17 -08002621 /*
2622 * If frame is marked invalid, just drop it.
2623 */
Robert Love42e9a922008-12-09 15:10:17 -08002624 switch (fr_eof(fp)) {
2625 case FC_EOF_T:
2626 if (f_ctl & FC_FC_END_SEQ)
2627 skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl));
2628 /* fall through */
2629 case FC_EOF_N:
2630 if (fh->fh_type == FC_TYPE_BLS)
Vasu Dev52ff8782009-07-29 17:05:10 -07002631 fc_exch_recv_bls(ema->mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002632 else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
2633 FC_FC_EX_CTX)
Vasu Dev52ff8782009-07-29 17:05:10 -07002634 fc_exch_recv_seq_resp(ema->mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002635 else if (f_ctl & FC_FC_SEQ_CTX)
Vasu Dev52ff8782009-07-29 17:05:10 -07002636 fc_exch_recv_resp(ema->mp, fp);
Joe Eykholt922611562010-07-20 15:21:12 -07002637 else /* no EX_CTX and no SEQ_CTX */
Robert Love3a3b42b2009-11-03 11:47:39 -08002638 fc_exch_recv_req(lport, ema->mp, fp);
Robert Love42e9a922008-12-09 15:10:17 -08002639 break;
2640 default:
Robert Love3a3b42b2009-11-03 11:47:39 -08002641 FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)",
2642 fr_eof(fp));
Robert Love42e9a922008-12-09 15:10:17 -08002643 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -08002644 }
2645}
2646EXPORT_SYMBOL(fc_exch_recv);
2647
Robert Love3a3b42b2009-11-03 11:47:39 -08002648/**
2649 * fc_exch_init() - Initialize the exchange layer for a local port
2650 * @lport: The local port to initialize the exchange layer for
2651 */
2652int fc_exch_init(struct fc_lport *lport)
Robert Love42e9a922008-12-09 15:10:17 -08002653{
Robert Love3a3b42b2009-11-03 11:47:39 -08002654 if (!lport->tt.exch_mgr_reset)
2655 lport->tt.exch_mgr_reset = fc_exch_mgr_reset;
Robert Love42e9a922008-12-09 15:10:17 -08002656
Joe Eykholt62bdb642011-01-28 16:04:34 -08002657 if (!lport->tt.seq_release)
2658 lport->tt.seq_release = fc_seq_release;
2659
Vasu Dev89f19a52009-10-21 16:27:28 -07002660 return 0;
2661}
2662EXPORT_SYMBOL(fc_exch_init);
2663
2664/**
2665 * fc_setup_exch_mgr() - Setup an exchange manager
2666 */
Randy Dunlap55204902011-01-28 16:03:57 -08002667int fc_setup_exch_mgr(void)
Vasu Dev89f19a52009-10-21 16:27:28 -07002668{
2669 fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch),
2670 0, SLAB_HWCACHE_ALIGN, NULL);
2671 if (!fc_em_cachep)
2672 return -ENOMEM;
2673
Vasu Deve4bc50b2009-08-25 13:58:47 -07002674 /*
2675 * Initialize fc_cpu_mask and fc_cpu_order. The
2676 * fc_cpu_mask is set for nr_cpu_ids rounded up
2677 * to order of 2's * power and order is stored
2678 * in fc_cpu_order as this is later required in
2679 * mapping between an exch id and exch array index
2680 * in per cpu exch pool.
2681 *
2682 * This round up is required to align fc_cpu_mask
2683 * to exchange id's lower bits such that all incoming
2684 * frames of an exchange gets delivered to the same
2685 * cpu on which exchange originated by simple bitwise
2686 * AND operation between fc_cpu_mask and exchange id.
2687 */
Bart Van Asschea84ea8c2013-08-14 15:33:35 +00002688 fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids));
2689 fc_cpu_mask = (1 << fc_cpu_order) - 1;
Vasu Deve4bc50b2009-08-25 13:58:47 -07002690
Vasu Dev4ae1e192009-11-03 11:50:10 -08002691 fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue");
2692 if (!fc_exch_workqueue)
Hillf Danton6f06e3a2011-07-27 15:10:34 -07002693 goto err;
Robert Love42e9a922008-12-09 15:10:17 -08002694 return 0;
Hillf Danton6f06e3a2011-07-27 15:10:34 -07002695err:
2696 kmem_cache_destroy(fc_em_cachep);
2697 return -ENOMEM;
Robert Love42e9a922008-12-09 15:10:17 -08002698}
Robert Love42e9a922008-12-09 15:10:17 -08002699
Robert Love3a3b42b2009-11-03 11:47:39 -08002700/**
2701 * fc_destroy_exch_mgr() - Destroy an exchange manager
2702 */
Randy Dunlap55204902011-01-28 16:03:57 -08002703void fc_destroy_exch_mgr(void)
Robert Love42e9a922008-12-09 15:10:17 -08002704{
Vasu Dev4ae1e192009-11-03 11:50:10 -08002705 destroy_workqueue(fc_exch_workqueue);
Robert Love42e9a922008-12-09 15:10:17 -08002706 kmem_cache_destroy(fc_em_cachep);
2707}