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
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.
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
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.
19 * Maintained at www.Open-FCoE.org
23 * Fibre Channel exchange and sequence handling.
26 #include <linux/timer.h>
27 #include <linux/slab.h>
28 #include <linux/err.h>
30 #include <scsi/fc/fc_fc2.h>
32 #include <scsi/libfc.h>
33 #include <scsi/fc_encode.h>
37 u16 fc_cpu_mask
; /* cpu mask for possible cpus */
38 EXPORT_SYMBOL(fc_cpu_mask
);
39 static u16 fc_cpu_order
; /* 2's power to represent total possible cpus */
40 static struct kmem_cache
*fc_em_cachep
; /* cache for exchanges */
41 struct workqueue_struct
*fc_exch_workqueue
;
44 * Structure and function definitions for managing Fibre Channel Exchanges
47 * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
49 * fc_exch_mgr holds the exchange state for an N port
51 * fc_exch holds state for one exchange and links to its active sequence.
53 * fc_seq holds the state for an individual sequence.
57 * struct fc_exch_pool - Per cpu exchange pool
58 * @next_index: Next possible free exchange index
59 * @total_exches: Total allocated exchanges
60 * @lock: Exch pool lock
61 * @ex_list: List of exchanges
63 * This structure manages per cpu exchanges in array of exchange pointers.
64 * This array is allocated followed by struct fc_exch_pool memory for
65 * assigned range of exchanges to per cpu pool.
71 struct list_head ex_list
;
75 * struct fc_exch_mgr - The Exchange Manager (EM).
76 * @class: Default class for new sequences
77 * @kref: Reference counter
78 * @min_xid: Minimum exchange ID
79 * @max_xid: Maximum exchange ID
80 * @ep_pool: Reserved exchange pointers
81 * @pool_max_index: Max exch array index in exch pool
82 * @pool: Per cpu exch pool
83 * @stats: Statistics structure
85 * This structure is the center for creating exchanges and sequences.
86 * It manages the allocation of exchange IDs.
95 struct fc_exch_pool
*pool
;
98 atomic_t no_free_exch
;
99 atomic_t no_free_exch_xid
;
100 atomic_t xid_not_found
;
102 atomic_t seq_not_found
;
103 atomic_t non_bls_resp
;
106 #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
109 * struct fc_exch_mgr_anchor - primary structure for list of EMs
110 * @ema_list: Exchange Manager Anchor list
111 * @mp: Exchange Manager associated with this anchor
112 * @match: Routine to determine if this anchor's EM should be used
114 * When walking the list of anchors the match routine will be called
115 * for each anchor to determine if that EM should be used. The last
116 * anchor in the list will always match to handle any exchanges not
117 * handled by other EMs. The non-default EMs would be added to the
118 * anchor list by HW that provides FCoE offloads.
120 struct fc_exch_mgr_anchor
{
121 struct list_head ema_list
;
122 struct fc_exch_mgr
*mp
;
123 bool (*match
)(struct fc_frame
*);
126 static void fc_exch_rrq(struct fc_exch
*);
127 static void fc_seq_ls_acc(struct fc_frame
*);
128 static void fc_seq_ls_rjt(struct fc_frame
*, enum fc_els_rjt_reason
,
129 enum fc_els_rjt_explan
);
130 static void fc_exch_els_rec(struct fc_frame
*);
131 static void fc_exch_els_rrq(struct fc_frame
*);
137 * The EM code run in a per-CPU worker thread.
139 * To protect against concurrency between a worker thread code and timers,
140 * sequence allocation and deallocation must be locked.
141 * - exchange refcnt can be done atomicly without locks.
142 * - sequence allocation must be locked by exch lock.
143 * - If the EM pool lock and ex_lock must be taken at the same time, then the
144 * EM pool lock must be taken before the ex_lock.
148 * opcode names for debugging.
150 static char *fc_exch_rctl_names
[] = FC_RCTL_NAMES_INIT
;
153 * fc_exch_name_lookup() - Lookup name by opcode
154 * @op: Opcode to be looked up
155 * @table: Opcode/name table
156 * @max_index: Index not to be exceeded
158 * This routine is used to determine a human-readable string identifying
161 static inline const char *fc_exch_name_lookup(unsigned int op
, char **table
,
162 unsigned int max_index
)
164 const char *name
= NULL
;
174 * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
175 * @op: The opcode to be looked up
177 static const char *fc_exch_rctl_name(unsigned int op
)
179 return fc_exch_name_lookup(op
, fc_exch_rctl_names
,
180 ARRAY_SIZE(fc_exch_rctl_names
));
184 * fc_exch_hold() - Increment an exchange's reference count
185 * @ep: Echange to be held
187 static inline void fc_exch_hold(struct fc_exch
*ep
)
189 atomic_inc(&ep
->ex_refcnt
);
193 * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
194 * and determine SOF and EOF.
195 * @ep: The exchange to that will use the header
196 * @fp: The frame whose header is to be modified
197 * @f_ctl: F_CTL bits that will be used for the frame header
199 * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
200 * fh_seq_id, fh_seq_cnt and the SOF and EOF.
202 static void fc_exch_setup_hdr(struct fc_exch
*ep
, struct fc_frame
*fp
,
205 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
208 fr_sof(fp
) = ep
->class;
210 fr_sof(fp
) = fc_sof_normal(ep
->class);
212 if (f_ctl
& FC_FC_END_SEQ
) {
213 fr_eof(fp
) = FC_EOF_T
;
214 if (fc_sof_needs_ack(ep
->class))
215 fr_eof(fp
) = FC_EOF_N
;
218 * The number of fill bytes to make the length a 4-byte
219 * multiple is the low order 2-bits of the f_ctl.
220 * The fill itself will have been cleared by the frame
222 * After this, the length will be even, as expected by
225 fill
= fr_len(fp
) & 3;
228 /* TODO, this may be a problem with fragmented skb */
229 skb_put(fp_skb(fp
), fill
);
230 hton24(fh
->fh_f_ctl
, f_ctl
| fill
);
233 WARN_ON(fr_len(fp
) % 4 != 0); /* no pad to non last frame */
234 fr_eof(fp
) = FC_EOF_N
;
238 * Initialize remainig fh fields
239 * from fc_fill_fc_hdr
241 fh
->fh_ox_id
= htons(ep
->oxid
);
242 fh
->fh_rx_id
= htons(ep
->rxid
);
243 fh
->fh_seq_id
= ep
->seq
.id
;
244 fh
->fh_seq_cnt
= htons(ep
->seq
.cnt
);
248 * fc_exch_release() - Decrement an exchange's reference count
249 * @ep: Exchange to be released
251 * If the reference count reaches zero and the exchange is complete,
254 static void fc_exch_release(struct fc_exch
*ep
)
256 struct fc_exch_mgr
*mp
;
258 if (atomic_dec_and_test(&ep
->ex_refcnt
)) {
261 ep
->destructor(&ep
->seq
, ep
->arg
);
262 WARN_ON(!(ep
->esb_stat
& ESB_ST_COMPLETE
));
263 mempool_free(ep
, mp
->ep_pool
);
268 * fc_exch_done_locked() - Complete an exchange with the exchange lock held
269 * @ep: The exchange that is complete
271 static int fc_exch_done_locked(struct fc_exch
*ep
)
276 * We must check for completion in case there are two threads
277 * tyring to complete this. But the rrq code will reuse the
278 * ep, and in that case we only clear the resp and set it as
279 * complete, so it can be reused by the timer to send the rrq.
282 if (ep
->state
& FC_EX_DONE
)
284 ep
->esb_stat
|= ESB_ST_COMPLETE
;
286 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
)) {
287 ep
->state
|= FC_EX_DONE
;
288 if (cancel_delayed_work(&ep
->timeout_work
))
289 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
296 * fc_exch_ptr_get() - Return an exchange from an exchange pool
297 * @pool: Exchange Pool to get an exchange from
298 * @index: Index of the exchange within the pool
300 * Use the index to get an exchange from within an exchange pool. exches
301 * will point to an array of exchange pointers. The index will select
302 * the exchange within the array.
304 static inline struct fc_exch
*fc_exch_ptr_get(struct fc_exch_pool
*pool
,
307 struct fc_exch
**exches
= (struct fc_exch
**)(pool
+ 1);
308 return exches
[index
];
312 * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
313 * @pool: The pool to assign the exchange to
314 * @index: The index in the pool where the exchange will be assigned
315 * @ep: The exchange to assign to the pool
317 static inline void fc_exch_ptr_set(struct fc_exch_pool
*pool
, u16 index
,
320 ((struct fc_exch
**)(pool
+ 1))[index
] = ep
;
324 * fc_exch_delete() - Delete an exchange
325 * @ep: The exchange to be deleted
327 static void fc_exch_delete(struct fc_exch
*ep
)
329 struct fc_exch_pool
*pool
;
332 spin_lock_bh(&pool
->lock
);
333 WARN_ON(pool
->total_exches
<= 0);
334 pool
->total_exches
--;
335 fc_exch_ptr_set(pool
, (ep
->xid
- ep
->em
->min_xid
) >> fc_cpu_order
,
337 list_del(&ep
->ex_list
);
338 spin_unlock_bh(&pool
->lock
);
339 fc_exch_release(ep
); /* drop hold for exch in mp */
343 * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
344 * the exchange lock held
345 * @ep: The exchange whose timer will start
346 * @timer_msec: The timeout period
348 * Used for upper level protocols to time out the exchange.
349 * The timer is cancelled when it fires or when the exchange completes.
351 static inline void fc_exch_timer_set_locked(struct fc_exch
*ep
,
352 unsigned int timer_msec
)
354 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
357 FC_EXCH_DBG(ep
, "Exchange timer armed\n");
359 if (queue_delayed_work(fc_exch_workqueue
, &ep
->timeout_work
,
360 msecs_to_jiffies(timer_msec
)))
361 fc_exch_hold(ep
); /* hold for timer */
365 * fc_exch_timer_set() - Lock the exchange and set the timer
366 * @ep: The exchange whose timer will start
367 * @timer_msec: The timeout period
369 static void fc_exch_timer_set(struct fc_exch
*ep
, unsigned int timer_msec
)
371 spin_lock_bh(&ep
->ex_lock
);
372 fc_exch_timer_set_locked(ep
, timer_msec
);
373 spin_unlock_bh(&ep
->ex_lock
);
377 * fc_seq_send() - Send a frame using existing sequence/exchange pair
378 * @lport: The local port that the exchange will be sent on
379 * @sp: The sequence to be sent
380 * @fp: The frame to be sent on the exchange
382 static int fc_seq_send(struct fc_lport
*lport
, struct fc_seq
*sp
,
386 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
390 ep
= fc_seq_exch(sp
);
391 WARN_ON((ep
->esb_stat
& ESB_ST_SEQ_INIT
) != ESB_ST_SEQ_INIT
);
393 f_ctl
= ntoh24(fh
->fh_f_ctl
);
394 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
395 fr_encaps(fp
) = ep
->encaps
;
398 * update sequence count if this frame is carrying
399 * multiple FC frames when sequence offload is enabled
402 if (fr_max_payload(fp
))
403 sp
->cnt
+= DIV_ROUND_UP((fr_len(fp
) - sizeof(*fh
)),
411 error
= lport
->tt
.frame_send(lport
, fp
);
414 * Update the exchange and sequence flags,
415 * assuming all frames for the sequence have been sent.
416 * We can only be called to send once for each sequence.
418 spin_lock_bh(&ep
->ex_lock
);
419 ep
->f_ctl
= f_ctl
& ~FC_FC_FIRST_SEQ
; /* not first seq */
420 if (f_ctl
& FC_FC_SEQ_INIT
)
421 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
422 spin_unlock_bh(&ep
->ex_lock
);
427 * fc_seq_alloc() - Allocate a sequence for a given exchange
428 * @ep: The exchange to allocate a new sequence for
429 * @seq_id: The sequence ID to be used
431 * We don't support multiple originated sequences on the same exchange.
432 * By implication, any previously originated sequence on this exchange
433 * is complete, and we reallocate the same sequence.
435 static struct fc_seq
*fc_seq_alloc(struct fc_exch
*ep
, u8 seq_id
)
447 * fc_seq_start_next_locked() - Allocate a new sequence on the same
448 * exchange as the supplied sequence
449 * @sp: The sequence/exchange to get a new sequence for
451 static struct fc_seq
*fc_seq_start_next_locked(struct fc_seq
*sp
)
453 struct fc_exch
*ep
= fc_seq_exch(sp
);
455 sp
= fc_seq_alloc(ep
, ep
->seq_id
++);
456 FC_EXCH_DBG(ep
, "f_ctl %6x seq %2x\n",
462 * fc_seq_start_next() - Lock the exchange and get a new sequence
463 * for a given sequence/exchange pair
464 * @sp: The sequence/exchange to get a new exchange for
466 static struct fc_seq
*fc_seq_start_next(struct fc_seq
*sp
)
468 struct fc_exch
*ep
= fc_seq_exch(sp
);
470 spin_lock_bh(&ep
->ex_lock
);
471 sp
= fc_seq_start_next_locked(sp
);
472 spin_unlock_bh(&ep
->ex_lock
);
478 * fc_seq_exch_abort() - Abort an exchange and sequence
479 * @req_sp: The sequence to be aborted
480 * @timer_msec: The period of time to wait before aborting
482 * Generally called because of a timeout or an abort from the upper layer.
484 static int fc_seq_exch_abort(const struct fc_seq
*req_sp
,
485 unsigned int timer_msec
)
492 ep
= fc_seq_exch(req_sp
);
494 spin_lock_bh(&ep
->ex_lock
);
495 if (ep
->esb_stat
& (ESB_ST_COMPLETE
| ESB_ST_ABNORMAL
) ||
496 ep
->state
& (FC_EX_DONE
| FC_EX_RST_CLEANUP
)) {
497 spin_unlock_bh(&ep
->ex_lock
);
502 * Send the abort on a new sequence if possible.
504 sp
= fc_seq_start_next_locked(&ep
->seq
);
506 spin_unlock_bh(&ep
->ex_lock
);
510 ep
->esb_stat
|= ESB_ST_SEQ_INIT
| ESB_ST_ABNORMAL
;
512 fc_exch_timer_set_locked(ep
, timer_msec
);
513 spin_unlock_bh(&ep
->ex_lock
);
516 * If not logged into the fabric, don't send ABTS but leave
517 * sequence active until next timeout.
523 * Send an abort for the sequence that timed out.
525 fp
= fc_frame_alloc(ep
->lp
, 0);
527 fc_fill_fc_hdr(fp
, FC_RCTL_BA_ABTS
, ep
->did
, ep
->sid
,
528 FC_TYPE_BLS
, FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
529 error
= fc_seq_send(ep
->lp
, sp
, fp
);
536 * fc_exch_timeout() - Handle exchange timer expiration
537 * @work: The work_struct identifying the exchange that timed out
539 static void fc_exch_timeout(struct work_struct
*work
)
541 struct fc_exch
*ep
= container_of(work
, struct fc_exch
,
543 struct fc_seq
*sp
= &ep
->seq
;
544 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
549 FC_EXCH_DBG(ep
, "Exchange timed out\n");
551 spin_lock_bh(&ep
->ex_lock
);
552 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
555 e_stat
= ep
->esb_stat
;
556 if (e_stat
& ESB_ST_COMPLETE
) {
557 ep
->esb_stat
= e_stat
& ~ESB_ST_REC_QUAL
;
558 spin_unlock_bh(&ep
->ex_lock
);
559 if (e_stat
& ESB_ST_REC_QUAL
)
566 if (e_stat
& ESB_ST_ABNORMAL
)
567 rc
= fc_exch_done_locked(ep
);
568 spin_unlock_bh(&ep
->ex_lock
);
572 resp(sp
, ERR_PTR(-FC_EX_TIMEOUT
), arg
);
573 fc_seq_exch_abort(sp
, 2 * ep
->r_a_tov
);
577 spin_unlock_bh(&ep
->ex_lock
);
580 * This release matches the hold taken when the timer was set.
586 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
587 * @lport: The local port that the exchange is for
588 * @mp: The exchange manager that will allocate the exchange
590 * Returns pointer to allocated fc_exch with exch lock held.
592 static struct fc_exch
*fc_exch_em_alloc(struct fc_lport
*lport
,
593 struct fc_exch_mgr
*mp
)
598 struct fc_exch_pool
*pool
;
600 /* allocate memory for exchange */
601 ep
= mempool_alloc(mp
->ep_pool
, GFP_ATOMIC
);
603 atomic_inc(&mp
->stats
.no_free_exch
);
606 memset(ep
, 0, sizeof(*ep
));
609 pool
= per_cpu_ptr(mp
->pool
, cpu
);
610 spin_lock_bh(&pool
->lock
);
612 index
= pool
->next_index
;
613 /* allocate new exch from pool */
614 while (fc_exch_ptr_get(pool
, index
)) {
615 index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
616 if (index
== pool
->next_index
)
619 pool
->next_index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
621 fc_exch_hold(ep
); /* hold for exch in mp */
622 spin_lock_init(&ep
->ex_lock
);
624 * Hold exch lock for caller to prevent fc_exch_reset()
625 * from releasing exch while fc_exch_alloc() caller is
626 * still working on exch.
628 spin_lock_bh(&ep
->ex_lock
);
630 fc_exch_ptr_set(pool
, index
, ep
);
631 list_add_tail(&ep
->ex_list
, &pool
->ex_list
);
632 fc_seq_alloc(ep
, ep
->seq_id
++);
633 pool
->total_exches
++;
634 spin_unlock_bh(&pool
->lock
);
639 ep
->oxid
= ep
->xid
= (index
<< fc_cpu_order
| cpu
) + mp
->min_xid
;
643 ep
->f_ctl
= FC_FC_FIRST_SEQ
; /* next seq is first seq */
644 ep
->rxid
= FC_XID_UNKNOWN
;
645 ep
->class = mp
->class;
646 INIT_DELAYED_WORK(&ep
->timeout_work
, fc_exch_timeout
);
650 spin_unlock_bh(&pool
->lock
);
651 atomic_inc(&mp
->stats
.no_free_exch_xid
);
652 mempool_free(ep
, mp
->ep_pool
);
657 * fc_exch_alloc() - Allocate an exchange from an EM on a
658 * local port's list of EMs.
659 * @lport: The local port that will own the exchange
660 * @fp: The FC frame that the exchange will be for
662 * This function walks the list of exchange manager(EM)
663 * anchors to select an EM for a new exchange allocation. The
664 * EM is selected when a NULL match function pointer is encountered
665 * or when a call to a match function returns true.
667 static inline struct fc_exch
*fc_exch_alloc(struct fc_lport
*lport
,
670 struct fc_exch_mgr_anchor
*ema
;
672 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
673 if (!ema
->match
|| ema
->match(fp
))
674 return fc_exch_em_alloc(lport
, ema
->mp
);
679 * fc_exch_find() - Lookup and hold an exchange
680 * @mp: The exchange manager to lookup the exchange from
681 * @xid: The XID of the exchange to look up
683 static struct fc_exch
*fc_exch_find(struct fc_exch_mgr
*mp
, u16 xid
)
685 struct fc_exch_pool
*pool
;
686 struct fc_exch
*ep
= NULL
;
688 if ((xid
>= mp
->min_xid
) && (xid
<= mp
->max_xid
)) {
689 pool
= per_cpu_ptr(mp
->pool
, xid
& fc_cpu_mask
);
690 spin_lock_bh(&pool
->lock
);
691 ep
= fc_exch_ptr_get(pool
, (xid
- mp
->min_xid
) >> fc_cpu_order
);
694 WARN_ON(ep
->xid
!= xid
);
696 spin_unlock_bh(&pool
->lock
);
703 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
704 * the memory allocated for the related objects may be freed.
705 * @sp: The sequence that has completed
707 static void fc_exch_done(struct fc_seq
*sp
)
709 struct fc_exch
*ep
= fc_seq_exch(sp
);
712 spin_lock_bh(&ep
->ex_lock
);
713 rc
= fc_exch_done_locked(ep
);
714 spin_unlock_bh(&ep
->ex_lock
);
720 * fc_exch_resp() - Allocate a new exchange for a response frame
721 * @lport: The local port that the exchange was for
722 * @mp: The exchange manager to allocate the exchange from
723 * @fp: The response frame
725 * Sets the responder ID in the frame header.
727 static struct fc_exch
*fc_exch_resp(struct fc_lport
*lport
,
728 struct fc_exch_mgr
*mp
,
732 struct fc_frame_header
*fh
;
734 ep
= fc_exch_alloc(lport
, fp
);
736 ep
->class = fc_frame_class(fp
);
739 * Set EX_CTX indicating we're responding on this exchange.
741 ep
->f_ctl
|= FC_FC_EX_CTX
; /* we're responding */
742 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not new */
743 fh
= fc_frame_header_get(fp
);
744 ep
->sid
= ntoh24(fh
->fh_d_id
);
745 ep
->did
= ntoh24(fh
->fh_s_id
);
749 * Allocated exchange has placed the XID in the
750 * originator field. Move it to the responder field,
751 * and set the originator XID from the frame.
754 ep
->oxid
= ntohs(fh
->fh_ox_id
);
755 ep
->esb_stat
|= ESB_ST_RESP
| ESB_ST_SEQ_INIT
;
756 if ((ntoh24(fh
->fh_f_ctl
) & FC_FC_SEQ_INIT
) == 0)
757 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
759 fc_exch_hold(ep
); /* hold for caller */
760 spin_unlock_bh(&ep
->ex_lock
); /* lock from fc_exch_alloc */
766 * fc_seq_lookup_recip() - Find a sequence where the other end
767 * originated the sequence
768 * @lport: The local port that the frame was sent to
769 * @mp: The Exchange Manager to lookup the exchange from
770 * @fp: The frame associated with the sequence we're looking for
772 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
773 * on the ep that should be released by the caller.
775 static enum fc_pf_rjt_reason
fc_seq_lookup_recip(struct fc_lport
*lport
,
776 struct fc_exch_mgr
*mp
,
779 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
780 struct fc_exch
*ep
= NULL
;
781 struct fc_seq
*sp
= NULL
;
782 enum fc_pf_rjt_reason reject
= FC_RJT_NONE
;
786 f_ctl
= ntoh24(fh
->fh_f_ctl
);
787 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != 0);
790 * Lookup or create the exchange if we will be creating the sequence.
792 if (f_ctl
& FC_FC_EX_CTX
) {
793 xid
= ntohs(fh
->fh_ox_id
); /* we originated exch */
794 ep
= fc_exch_find(mp
, xid
);
796 atomic_inc(&mp
->stats
.xid_not_found
);
797 reject
= FC_RJT_OX_ID
;
800 if (ep
->rxid
== FC_XID_UNKNOWN
)
801 ep
->rxid
= ntohs(fh
->fh_rx_id
);
802 else if (ep
->rxid
!= ntohs(fh
->fh_rx_id
)) {
803 reject
= FC_RJT_OX_ID
;
807 xid
= ntohs(fh
->fh_rx_id
); /* we are the responder */
809 if (xid
== 0 && fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
&&
810 fc_frame_payload_op(fp
) == ELS_TEST
) {
811 fh
->fh_rx_id
= htons(FC_XID_UNKNOWN
);
812 xid
= FC_XID_UNKNOWN
;
816 * new sequence - find the exchange
818 ep
= fc_exch_find(mp
, xid
);
819 if ((f_ctl
& FC_FC_FIRST_SEQ
) && fc_sof_is_init(fr_sof(fp
))) {
821 atomic_inc(&mp
->stats
.xid_busy
);
822 reject
= FC_RJT_RX_ID
;
825 ep
= fc_exch_resp(lport
, mp
, fp
);
827 reject
= FC_RJT_EXCH_EST
;
830 xid
= ep
->xid
; /* get our XID */
832 atomic_inc(&mp
->stats
.xid_not_found
);
833 reject
= FC_RJT_RX_ID
; /* XID not found */
839 * At this point, we have the exchange held.
840 * Find or create the sequence.
842 if (fc_sof_is_init(fr_sof(fp
))) {
844 sp
->ssb_stat
|= SSB_ST_RESP
;
845 sp
->id
= fh
->fh_seq_id
;
848 if (sp
->id
!= fh
->fh_seq_id
) {
849 atomic_inc(&mp
->stats
.seq_not_found
);
850 reject
= FC_RJT_SEQ_ID
; /* sequence/exch should exist */
854 WARN_ON(ep
!= fc_seq_exch(sp
));
856 if (f_ctl
& FC_FC_SEQ_INIT
)
857 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
863 fc_exch_done(&ep
->seq
);
864 fc_exch_release(ep
); /* hold from fc_exch_find/fc_exch_resp */
869 * fc_seq_lookup_orig() - Find a sequence where this end
870 * originated the sequence
871 * @mp: The Exchange Manager to lookup the exchange from
872 * @fp: The frame associated with the sequence we're looking for
874 * Does not hold the sequence for the caller.
876 static struct fc_seq
*fc_seq_lookup_orig(struct fc_exch_mgr
*mp
,
879 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
881 struct fc_seq
*sp
= NULL
;
885 f_ctl
= ntoh24(fh
->fh_f_ctl
);
886 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != FC_FC_SEQ_CTX
);
887 xid
= ntohs((f_ctl
& FC_FC_EX_CTX
) ? fh
->fh_ox_id
: fh
->fh_rx_id
);
888 ep
= fc_exch_find(mp
, xid
);
891 if (ep
->seq
.id
== fh
->fh_seq_id
) {
893 * Save the RX_ID if we didn't previously know it.
896 if ((f_ctl
& FC_FC_EX_CTX
) != 0 &&
897 ep
->rxid
== FC_XID_UNKNOWN
) {
898 ep
->rxid
= ntohs(fh
->fh_rx_id
);
906 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
907 * @ep: The exchange to set the addresses for
908 * @orig_id: The originator's ID
909 * @resp_id: The responder's ID
911 * Note this must be done before the first sequence of the exchange is sent.
913 static void fc_exch_set_addr(struct fc_exch
*ep
,
914 u32 orig_id
, u32 resp_id
)
917 if (ep
->esb_stat
& ESB_ST_RESP
) {
927 * fc_seq_els_rsp_send() - Send an ELS response using infomation from
928 * the existing sequence/exchange.
929 * @fp: The received frame
930 * @els_cmd: The ELS command to be sent
931 * @els_data: The ELS data to be sent
933 * The received frame is not freed.
935 static void fc_seq_els_rsp_send(struct fc_frame
*fp
, enum fc_els_cmd els_cmd
,
936 struct fc_seq_els_data
*els_data
)
940 fc_seq_ls_rjt(fp
, els_data
->reason
, els_data
->explan
);
952 FC_LPORT_DBG(fr_dev(fp
), "Invalid ELS CMD:%x\n", els_cmd
);
957 * fc_seq_send_last() - Send a sequence that is the last in the exchange
958 * @sp: The sequence that is to be sent
959 * @fp: The frame that will be sent on the sequence
960 * @rctl: The R_CTL information to be sent
961 * @fh_type: The frame header type
963 static void fc_seq_send_last(struct fc_seq
*sp
, struct fc_frame
*fp
,
964 enum fc_rctl rctl
, enum fc_fh_type fh_type
)
967 struct fc_exch
*ep
= fc_seq_exch(sp
);
969 f_ctl
= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
;
971 fc_fill_fc_hdr(fp
, rctl
, ep
->did
, ep
->sid
, fh_type
, f_ctl
, 0);
972 fc_seq_send(ep
->lp
, sp
, fp
);
976 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
977 * @sp: The sequence to send the ACK on
978 * @rx_fp: The received frame that is being acknoledged
980 * Send ACK_1 (or equiv.) indicating we received something.
982 static void fc_seq_send_ack(struct fc_seq
*sp
, const struct fc_frame
*rx_fp
)
985 struct fc_frame_header
*rx_fh
;
986 struct fc_frame_header
*fh
;
987 struct fc_exch
*ep
= fc_seq_exch(sp
);
988 struct fc_lport
*lport
= ep
->lp
;
992 * Don't send ACKs for class 3.
994 if (fc_sof_needs_ack(fr_sof(rx_fp
))) {
995 fp
= fc_frame_alloc(lport
, 0);
999 fh
= fc_frame_header_get(fp
);
1000 fh
->fh_r_ctl
= FC_RCTL_ACK_1
;
1001 fh
->fh_type
= FC_TYPE_BLS
;
1004 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1005 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1006 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1007 * Last ACK uses bits 7-6 (continue sequence),
1008 * bits 5-4 are meaningful (what kind of ACK to use).
1010 rx_fh
= fc_frame_header_get(rx_fp
);
1011 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1012 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1013 FC_FC_FIRST_SEQ
| FC_FC_LAST_SEQ
|
1014 FC_FC_END_SEQ
| FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1015 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1016 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1017 hton24(fh
->fh_f_ctl
, f_ctl
);
1019 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
1020 fh
->fh_seq_id
= rx_fh
->fh_seq_id
;
1021 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1022 fh
->fh_parm_offset
= htonl(1); /* ack single frame */
1024 fr_sof(fp
) = fr_sof(rx_fp
);
1025 if (f_ctl
& FC_FC_END_SEQ
)
1026 fr_eof(fp
) = FC_EOF_T
;
1028 fr_eof(fp
) = FC_EOF_N
;
1030 lport
->tt
.frame_send(lport
, fp
);
1035 * fc_exch_send_ba_rjt() - Send BLS Reject
1036 * @rx_fp: The frame being rejected
1037 * @reason: The reason the frame is being rejected
1038 * @explan: The explaination for the rejection
1040 * This is for rejecting BA_ABTS only.
1042 static void fc_exch_send_ba_rjt(struct fc_frame
*rx_fp
,
1043 enum fc_ba_rjt_reason reason
,
1044 enum fc_ba_rjt_explan explan
)
1046 struct fc_frame
*fp
;
1047 struct fc_frame_header
*rx_fh
;
1048 struct fc_frame_header
*fh
;
1049 struct fc_ba_rjt
*rp
;
1050 struct fc_lport
*lport
;
1053 lport
= fr_dev(rx_fp
);
1054 fp
= fc_frame_alloc(lport
, sizeof(*rp
));
1057 fh
= fc_frame_header_get(fp
);
1058 rx_fh
= fc_frame_header_get(rx_fp
);
1060 memset(fh
, 0, sizeof(*fh
) + sizeof(*rp
));
1062 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
1063 rp
->br_reason
= reason
;
1064 rp
->br_explan
= explan
;
1067 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1069 memcpy(fh
->fh_s_id
, rx_fh
->fh_d_id
, 3);
1070 memcpy(fh
->fh_d_id
, rx_fh
->fh_s_id
, 3);
1071 fh
->fh_ox_id
= rx_fh
->fh_ox_id
;
1072 fh
->fh_rx_id
= rx_fh
->fh_rx_id
;
1073 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1074 fh
->fh_r_ctl
= FC_RCTL_BA_RJT
;
1075 fh
->fh_type
= FC_TYPE_BLS
;
1078 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1079 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1080 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1081 * Last ACK uses bits 7-6 (continue sequence),
1082 * bits 5-4 are meaningful (what kind of ACK to use).
1083 * Always set LAST_SEQ, END_SEQ.
1085 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1086 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1087 FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1088 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1089 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1090 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
1091 f_ctl
&= ~FC_FC_FIRST_SEQ
;
1092 hton24(fh
->fh_f_ctl
, f_ctl
);
1094 fr_sof(fp
) = fc_sof_class(fr_sof(rx_fp
));
1095 fr_eof(fp
) = FC_EOF_T
;
1096 if (fc_sof_needs_ack(fr_sof(fp
)))
1097 fr_eof(fp
) = FC_EOF_N
;
1099 lport
->tt
.frame_send(lport
, fp
);
1103 * fc_exch_recv_abts() - Handle an incoming ABTS
1104 * @ep: The exchange the abort was on
1105 * @rx_fp: The ABTS frame
1107 * This would be for target mode usually, but could be due to lost
1108 * FCP transfer ready, confirm or RRQ. We always handle this as an
1109 * exchange abort, ignoring the parameter.
1111 static void fc_exch_recv_abts(struct fc_exch
*ep
, struct fc_frame
*rx_fp
)
1113 struct fc_frame
*fp
;
1114 struct fc_ba_acc
*ap
;
1115 struct fc_frame_header
*fh
;
1120 spin_lock_bh(&ep
->ex_lock
);
1121 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1122 spin_unlock_bh(&ep
->ex_lock
);
1125 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
))
1126 fc_exch_hold(ep
); /* hold for REC_QUAL */
1127 ep
->esb_stat
|= ESB_ST_ABNORMAL
| ESB_ST_REC_QUAL
;
1128 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
1130 fp
= fc_frame_alloc(ep
->lp
, sizeof(*ap
));
1132 spin_unlock_bh(&ep
->ex_lock
);
1135 fh
= fc_frame_header_get(fp
);
1136 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1137 memset(ap
, 0, sizeof(*ap
));
1139 ap
->ba_high_seq_cnt
= htons(0xffff);
1140 if (sp
->ssb_stat
& SSB_ST_RESP
) {
1141 ap
->ba_seq_id
= sp
->id
;
1142 ap
->ba_seq_id_val
= FC_BA_SEQ_ID_VAL
;
1143 ap
->ba_high_seq_cnt
= fh
->fh_seq_cnt
;
1144 ap
->ba_low_seq_cnt
= htons(sp
->cnt
);
1146 sp
= fc_seq_start_next_locked(sp
);
1147 spin_unlock_bh(&ep
->ex_lock
);
1148 fc_seq_send_last(sp
, fp
, FC_RCTL_BA_ACC
, FC_TYPE_BLS
);
1149 fc_frame_free(rx_fp
);
1153 fc_exch_send_ba_rjt(rx_fp
, FC_BA_RJT_UNABLE
, FC_BA_RJT_INV_XID
);
1155 fc_frame_free(rx_fp
);
1159 * fc_seq_assign() - Assign exchange and sequence for incoming request
1160 * @lport: The local port that received the request
1161 * @fp: The request frame
1163 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
1165 static struct fc_seq
*fc_seq_assign(struct fc_lport
*lport
, struct fc_frame
*fp
)
1167 struct fc_exch_mgr_anchor
*ema
;
1169 WARN_ON(lport
!= fr_dev(fp
));
1170 WARN_ON(fr_seq(fp
));
1173 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1174 if ((!ema
->match
|| ema
->match(fp
)) &&
1175 fc_seq_lookup_recip(lport
, ema
->mp
, fp
) != FC_RJT_NONE
)
1181 * fc_exch_recv_req() - Handler for an incoming request
1182 * @lport: The local port that received the request
1183 * @mp: The EM that the exchange is on
1184 * @fp: The request frame
1186 * This is used when the other end is originating the exchange
1189 static void fc_exch_recv_req(struct fc_lport
*lport
, struct fc_exch_mgr
*mp
,
1190 struct fc_frame
*fp
)
1192 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1193 struct fc_seq
*sp
= NULL
;
1194 struct fc_exch
*ep
= NULL
;
1195 enum fc_pf_rjt_reason reject
;
1197 /* We can have the wrong fc_lport at this point with NPIV, which is a
1198 * problem now that we know a new exchange needs to be allocated
1200 lport
= fc_vport_id_lookup(lport
, ntoh24(fh
->fh_d_id
));
1210 * If the RX_ID is 0xffff, don't allocate an exchange.
1211 * The upper-level protocol may request one later, if needed.
1213 if (fh
->fh_rx_id
== htons(FC_XID_UNKNOWN
))
1214 return lport
->tt
.lport_recv(lport
, fp
);
1216 reject
= fc_seq_lookup_recip(lport
, mp
, fp
);
1217 if (reject
== FC_RJT_NONE
) {
1218 sp
= fr_seq(fp
); /* sequence will be held */
1219 ep
= fc_seq_exch(sp
);
1220 fc_seq_send_ack(sp
, fp
);
1221 ep
->encaps
= fr_encaps(fp
);
1224 * Call the receive function.
1226 * The receive function may allocate a new sequence
1227 * over the old one, so we shouldn't change the
1228 * sequence after this.
1230 * The frame will be freed by the receive function.
1231 * If new exch resp handler is valid then call that
1235 ep
->resp(sp
, fp
, ep
->arg
);
1237 lport
->tt
.lport_recv(lport
, fp
);
1238 fc_exch_release(ep
); /* release from lookup */
1240 FC_LPORT_DBG(lport
, "exch/seq lookup failed: reject %x\n",
1247 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1248 * end is the originator of the sequence that is a
1249 * response to our initial exchange
1250 * @mp: The EM that the exchange is on
1251 * @fp: The response frame
1253 static void fc_exch_recv_seq_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1255 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1260 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1264 ep
= fc_exch_find(mp
, ntohs(fh
->fh_ox_id
));
1266 atomic_inc(&mp
->stats
.xid_not_found
);
1269 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1270 atomic_inc(&mp
->stats
.xid_not_found
);
1273 if (ep
->rxid
== FC_XID_UNKNOWN
)
1274 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1275 if (ep
->sid
!= 0 && ep
->sid
!= ntoh24(fh
->fh_d_id
)) {
1276 atomic_inc(&mp
->stats
.xid_not_found
);
1279 if (ep
->did
!= ntoh24(fh
->fh_s_id
) &&
1280 ep
->did
!= FC_FID_FLOGI
) {
1281 atomic_inc(&mp
->stats
.xid_not_found
);
1286 if (fc_sof_is_init(sof
)) {
1287 sp
->ssb_stat
|= SSB_ST_RESP
;
1288 sp
->id
= fh
->fh_seq_id
;
1289 } else if (sp
->id
!= fh
->fh_seq_id
) {
1290 atomic_inc(&mp
->stats
.seq_not_found
);
1294 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1296 if (f_ctl
& FC_FC_SEQ_INIT
)
1297 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1299 if (fc_sof_needs_ack(sof
))
1300 fc_seq_send_ack(sp
, fp
);
1302 ex_resp_arg
= ep
->arg
;
1304 if (fh
->fh_type
!= FC_TYPE_FCP
&& fr_eof(fp
) == FC_EOF_T
&&
1305 (f_ctl
& (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) ==
1306 (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) {
1307 spin_lock_bh(&ep
->ex_lock
);
1308 rc
= fc_exch_done_locked(ep
);
1309 WARN_ON(fc_seq_exch(sp
) != ep
);
1310 spin_unlock_bh(&ep
->ex_lock
);
1316 * Call the receive function.
1317 * The sequence is held (has a refcnt) for us,
1318 * but not for the receive function.
1320 * The receive function may allocate a new sequence
1321 * over the old one, so we shouldn't change the
1322 * sequence after this.
1324 * The frame will be freed by the receive function.
1325 * If new exch resp handler is valid then call that
1329 resp(sp
, fp
, ex_resp_arg
);
1332 fc_exch_release(ep
);
1335 fc_exch_release(ep
);
1341 * fc_exch_recv_resp() - Handler for a sequence where other end is
1342 * responding to our sequence
1343 * @mp: The EM that the exchange is on
1344 * @fp: The response frame
1346 static void fc_exch_recv_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1350 sp
= fc_seq_lookup_orig(mp
, fp
); /* doesn't hold sequence */
1353 atomic_inc(&mp
->stats
.xid_not_found
);
1355 atomic_inc(&mp
->stats
.non_bls_resp
);
1361 * fc_exch_abts_resp() - Handler for a response to an ABT
1362 * @ep: The exchange that the frame is on
1363 * @fp: The response frame
1365 * This response would be to an ABTS cancelling an exchange or sequence.
1366 * The response can be either BA_ACC or BA_RJT
1368 static void fc_exch_abts_resp(struct fc_exch
*ep
, struct fc_frame
*fp
)
1370 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1372 struct fc_frame_header
*fh
;
1373 struct fc_ba_acc
*ap
;
1377 int rc
= 1, has_rec
= 0;
1379 fh
= fc_frame_header_get(fp
);
1380 FC_EXCH_DBG(ep
, "exch: BLS rctl %x - %s\n", fh
->fh_r_ctl
,
1381 fc_exch_rctl_name(fh
->fh_r_ctl
));
1383 if (cancel_delayed_work_sync(&ep
->timeout_work
))
1384 fc_exch_release(ep
); /* release from pending timer hold */
1386 spin_lock_bh(&ep
->ex_lock
);
1387 switch (fh
->fh_r_ctl
) {
1388 case FC_RCTL_BA_ACC
:
1389 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1394 * Decide whether to establish a Recovery Qualifier.
1395 * We do this if there is a non-empty SEQ_CNT range and
1396 * SEQ_ID is the same as the one we aborted.
1398 low
= ntohs(ap
->ba_low_seq_cnt
);
1399 high
= ntohs(ap
->ba_high_seq_cnt
);
1400 if ((ep
->esb_stat
& ESB_ST_REC_QUAL
) == 0 &&
1401 (ap
->ba_seq_id_val
!= FC_BA_SEQ_ID_VAL
||
1402 ap
->ba_seq_id
== ep
->seq_id
) && low
!= high
) {
1403 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1404 fc_exch_hold(ep
); /* hold for recovery qualifier */
1408 case FC_RCTL_BA_RJT
:
1415 ex_resp_arg
= ep
->arg
;
1417 /* do we need to do some other checks here. Can we reuse more of
1418 * fc_exch_recv_seq_resp
1422 * do we want to check END_SEQ as well as LAST_SEQ here?
1424 if (ep
->fh_type
!= FC_TYPE_FCP
&&
1425 ntoh24(fh
->fh_f_ctl
) & FC_FC_LAST_SEQ
)
1426 rc
= fc_exch_done_locked(ep
);
1427 spin_unlock_bh(&ep
->ex_lock
);
1432 resp(sp
, fp
, ex_resp_arg
);
1437 fc_exch_timer_set(ep
, ep
->r_a_tov
);
1442 * fc_exch_recv_bls() - Handler for a BLS sequence
1443 * @mp: The EM that the exchange is on
1444 * @fp: The request frame
1446 * The BLS frame is always a sequence initiated by the remote side.
1447 * We may be either the originator or recipient of the exchange.
1449 static void fc_exch_recv_bls(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1451 struct fc_frame_header
*fh
;
1455 fh
= fc_frame_header_get(fp
);
1456 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1459 ep
= fc_exch_find(mp
, (f_ctl
& FC_FC_EX_CTX
) ?
1460 ntohs(fh
->fh_ox_id
) : ntohs(fh
->fh_rx_id
));
1461 if (ep
&& (f_ctl
& FC_FC_SEQ_INIT
)) {
1462 spin_lock_bh(&ep
->ex_lock
);
1463 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1464 spin_unlock_bh(&ep
->ex_lock
);
1466 if (f_ctl
& FC_FC_SEQ_CTX
) {
1468 * A response to a sequence we initiated.
1469 * This should only be ACKs for class 2 or F.
1471 switch (fh
->fh_r_ctl
) {
1476 FC_EXCH_DBG(ep
, "BLS rctl %x - %s received",
1478 fc_exch_rctl_name(fh
->fh_r_ctl
));
1483 switch (fh
->fh_r_ctl
) {
1484 case FC_RCTL_BA_RJT
:
1485 case FC_RCTL_BA_ACC
:
1487 fc_exch_abts_resp(ep
, fp
);
1491 case FC_RCTL_BA_ABTS
:
1492 fc_exch_recv_abts(ep
, fp
);
1494 default: /* ignore junk */
1500 fc_exch_release(ep
); /* release hold taken by fc_exch_find */
1504 * fc_seq_ls_acc() - Accept sequence with LS_ACC
1505 * @rx_fp: The received frame, not freed here.
1507 * If this fails due to allocation or transmit congestion, assume the
1508 * originator will repeat the sequence.
1510 static void fc_seq_ls_acc(struct fc_frame
*rx_fp
)
1512 struct fc_lport
*lport
;
1513 struct fc_els_ls_acc
*acc
;
1514 struct fc_frame
*fp
;
1516 lport
= fr_dev(rx_fp
);
1517 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1520 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1521 memset(acc
, 0, sizeof(*acc
));
1522 acc
->la_cmd
= ELS_LS_ACC
;
1523 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1524 lport
->tt
.frame_send(lport
, fp
);
1528 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
1529 * @rx_fp: The received frame, not freed here.
1530 * @reason: The reason the sequence is being rejected
1531 * @explan: The explanation for the rejection
1533 * If this fails due to allocation or transmit congestion, assume the
1534 * originator will repeat the sequence.
1536 static void fc_seq_ls_rjt(struct fc_frame
*rx_fp
, enum fc_els_rjt_reason reason
,
1537 enum fc_els_rjt_explan explan
)
1539 struct fc_lport
*lport
;
1540 struct fc_els_ls_rjt
*rjt
;
1541 struct fc_frame
*fp
;
1543 lport
= fr_dev(rx_fp
);
1544 fp
= fc_frame_alloc(lport
, sizeof(*rjt
));
1547 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1548 memset(rjt
, 0, sizeof(*rjt
));
1549 rjt
->er_cmd
= ELS_LS_RJT
;
1550 rjt
->er_reason
= reason
;
1551 rjt
->er_explan
= explan
;
1552 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1553 lport
->tt
.frame_send(lport
, fp
);
1557 * fc_exch_reset() - Reset an exchange
1558 * @ep: The exchange to be reset
1560 static void fc_exch_reset(struct fc_exch
*ep
)
1563 void (*resp
)(struct fc_seq
*, struct fc_frame
*, void *);
1567 spin_lock_bh(&ep
->ex_lock
);
1568 ep
->state
|= FC_EX_RST_CLEANUP
;
1569 if (cancel_delayed_work(&ep
->timeout_work
))
1570 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
1573 if (ep
->esb_stat
& ESB_ST_REC_QUAL
)
1574 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec_qual */
1575 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
1578 rc
= fc_exch_done_locked(ep
);
1579 spin_unlock_bh(&ep
->ex_lock
);
1584 resp(sp
, ERR_PTR(-FC_EX_CLOSED
), arg
);
1588 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1589 * @lport: The local port that the exchange pool is on
1590 * @pool: The exchange pool to be reset
1591 * @sid: The source ID
1592 * @did: The destination ID
1594 * Resets a per cpu exches pool, releasing all of its sequences
1595 * and exchanges. If sid is non-zero then reset only exchanges
1596 * we sourced from the local port's FID. If did is non-zero then
1597 * only reset exchanges destined for the local port's FID.
1599 static void fc_exch_pool_reset(struct fc_lport
*lport
,
1600 struct fc_exch_pool
*pool
,
1604 struct fc_exch
*next
;
1606 spin_lock_bh(&pool
->lock
);
1608 list_for_each_entry_safe(ep
, next
, &pool
->ex_list
, ex_list
) {
1609 if ((lport
== ep
->lp
) &&
1610 (sid
== 0 || sid
== ep
->sid
) &&
1611 (did
== 0 || did
== ep
->did
)) {
1613 spin_unlock_bh(&pool
->lock
);
1617 fc_exch_release(ep
);
1618 spin_lock_bh(&pool
->lock
);
1621 * must restart loop incase while lock
1622 * was down multiple eps were released.
1627 spin_unlock_bh(&pool
->lock
);
1631 * fc_exch_mgr_reset() - Reset all EMs of a local port
1632 * @lport: The local port whose EMs are to be reset
1633 * @sid: The source ID
1634 * @did: The destination ID
1636 * Reset all EMs associated with a given local port. Release all
1637 * sequences and exchanges. If sid is non-zero then reset only the
1638 * exchanges sent from the local port's FID. If did is non-zero then
1639 * reset only exchanges destined for the local port's FID.
1641 void fc_exch_mgr_reset(struct fc_lport
*lport
, u32 sid
, u32 did
)
1643 struct fc_exch_mgr_anchor
*ema
;
1646 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
1647 for_each_possible_cpu(cpu
)
1648 fc_exch_pool_reset(lport
,
1649 per_cpu_ptr(ema
->mp
->pool
, cpu
),
1653 EXPORT_SYMBOL(fc_exch_mgr_reset
);
1656 * fc_exch_lookup() - find an exchange
1657 * @lport: The local port
1658 * @xid: The exchange ID
1660 * Returns exchange pointer with hold for caller, or NULL if not found.
1662 static struct fc_exch
*fc_exch_lookup(struct fc_lport
*lport
, u32 xid
)
1664 struct fc_exch_mgr_anchor
*ema
;
1666 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1667 if (ema
->mp
->min_xid
<= xid
&& xid
<= ema
->mp
->max_xid
)
1668 return fc_exch_find(ema
->mp
, xid
);
1673 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
1674 * @rfp: The REC frame, not freed here.
1676 * Note that the requesting port may be different than the S_ID in the request.
1678 static void fc_exch_els_rec(struct fc_frame
*rfp
)
1680 struct fc_lport
*lport
;
1681 struct fc_frame
*fp
;
1683 struct fc_els_rec
*rp
;
1684 struct fc_els_rec_acc
*acc
;
1685 enum fc_els_rjt_reason reason
= ELS_RJT_LOGIC
;
1686 enum fc_els_rjt_explan explan
;
1691 lport
= fr_dev(rfp
);
1692 rp
= fc_frame_payload_get(rfp
, sizeof(*rp
));
1693 explan
= ELS_EXPL_INV_LEN
;
1696 sid
= ntoh24(rp
->rec_s_id
);
1697 rxid
= ntohs(rp
->rec_rx_id
);
1698 oxid
= ntohs(rp
->rec_ox_id
);
1700 ep
= fc_exch_lookup(lport
,
1701 sid
== fc_host_port_id(lport
->host
) ? oxid
: rxid
);
1702 explan
= ELS_EXPL_OXID_RXID
;
1705 if (ep
->oid
!= sid
|| oxid
!= ep
->oxid
)
1707 if (rxid
!= FC_XID_UNKNOWN
&& rxid
!= ep
->rxid
)
1709 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1713 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1714 memset(acc
, 0, sizeof(*acc
));
1715 acc
->reca_cmd
= ELS_LS_ACC
;
1716 acc
->reca_ox_id
= rp
->rec_ox_id
;
1717 memcpy(acc
->reca_ofid
, rp
->rec_s_id
, 3);
1718 acc
->reca_rx_id
= htons(ep
->rxid
);
1719 if (ep
->sid
== ep
->oid
)
1720 hton24(acc
->reca_rfid
, ep
->did
);
1722 hton24(acc
->reca_rfid
, ep
->sid
);
1723 acc
->reca_fc4value
= htonl(ep
->seq
.rec_data
);
1724 acc
->reca_e_stat
= htonl(ep
->esb_stat
& (ESB_ST_RESP
|
1727 fc_fill_reply_hdr(fp
, rfp
, FC_RCTL_ELS_REP
, 0);
1728 lport
->tt
.frame_send(lport
, fp
);
1730 fc_exch_release(ep
);
1734 fc_exch_release(ep
);
1736 fc_seq_ls_rjt(rfp
, reason
, explan
);
1740 * fc_exch_rrq_resp() - Handler for RRQ responses
1741 * @sp: The sequence that the RRQ is on
1742 * @fp: The RRQ frame
1743 * @arg: The exchange that the RRQ is on
1745 * TODO: fix error handler.
1747 static void fc_exch_rrq_resp(struct fc_seq
*sp
, struct fc_frame
*fp
, void *arg
)
1749 struct fc_exch
*aborted_ep
= arg
;
1753 int err
= PTR_ERR(fp
);
1755 if (err
== -FC_EX_CLOSED
|| err
== -FC_EX_TIMEOUT
)
1757 FC_EXCH_DBG(aborted_ep
, "Cannot process RRQ, "
1758 "frame error %d\n", err
);
1762 op
= fc_frame_payload_op(fp
);
1767 FC_EXCH_DBG(aborted_ep
, "LS_RJT for RRQ");
1772 FC_EXCH_DBG(aborted_ep
, "unexpected response op %x "
1778 fc_exch_done(&aborted_ep
->seq
);
1779 /* drop hold for rec qual */
1780 fc_exch_release(aborted_ep
);
1785 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
1786 * @lport: The local port to send the frame on
1787 * @fp: The frame to be sent
1788 * @resp: The response handler for this request
1789 * @destructor: The destructor for the exchange
1790 * @arg: The argument to be passed to the response handler
1791 * @timer_msec: The timeout period for the exchange
1793 * The frame pointer with some of the header's fields must be
1794 * filled before calling this routine, those fields are:
1801 * - parameter or relative offset
1803 static struct fc_seq
*fc_exch_seq_send(struct fc_lport
*lport
,
1804 struct fc_frame
*fp
,
1805 void (*resp
)(struct fc_seq
*,
1806 struct fc_frame
*fp
,
1808 void (*destructor
)(struct fc_seq
*,
1810 void *arg
, u32 timer_msec
)
1813 struct fc_seq
*sp
= NULL
;
1814 struct fc_frame_header
*fh
;
1817 ep
= fc_exch_alloc(lport
, fp
);
1822 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1823 fh
= fc_frame_header_get(fp
);
1824 fc_exch_set_addr(ep
, ntoh24(fh
->fh_s_id
), ntoh24(fh
->fh_d_id
));
1826 ep
->destructor
= destructor
;
1828 ep
->r_a_tov
= FC_DEF_R_A_TOV
;
1832 ep
->fh_type
= fh
->fh_type
; /* save for possbile timeout handling */
1833 ep
->f_ctl
= ntoh24(fh
->fh_f_ctl
);
1834 fc_exch_setup_hdr(ep
, fp
, ep
->f_ctl
);
1837 if (ep
->xid
<= lport
->lro_xid
&& fh
->fh_r_ctl
== FC_RCTL_DD_UNSOL_CMD
)
1838 fc_fcp_ddp_setup(fr_fsp(fp
), ep
->xid
);
1840 if (unlikely(lport
->tt
.frame_send(lport
, fp
)))
1844 fc_exch_timer_set_locked(ep
, timer_msec
);
1845 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not first seq */
1847 if (ep
->f_ctl
& FC_FC_SEQ_INIT
)
1848 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
1849 spin_unlock_bh(&ep
->ex_lock
);
1852 rc
= fc_exch_done_locked(ep
);
1853 spin_unlock_bh(&ep
->ex_lock
);
1860 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
1861 * @ep: The exchange to send the RRQ on
1863 * This tells the remote port to stop blocking the use of
1864 * the exchange and the seq_cnt range.
1866 static void fc_exch_rrq(struct fc_exch
*ep
)
1868 struct fc_lport
*lport
;
1869 struct fc_els_rrq
*rrq
;
1870 struct fc_frame
*fp
;
1875 fp
= fc_frame_alloc(lport
, sizeof(*rrq
));
1879 rrq
= fc_frame_payload_get(fp
, sizeof(*rrq
));
1880 memset(rrq
, 0, sizeof(*rrq
));
1881 rrq
->rrq_cmd
= ELS_RRQ
;
1882 hton24(rrq
->rrq_s_id
, ep
->sid
);
1883 rrq
->rrq_ox_id
= htons(ep
->oxid
);
1884 rrq
->rrq_rx_id
= htons(ep
->rxid
);
1887 if (ep
->esb_stat
& ESB_ST_RESP
)
1890 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, did
,
1891 lport
->port_id
, FC_TYPE_ELS
,
1892 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1894 if (fc_exch_seq_send(lport
, fp
, fc_exch_rrq_resp
, NULL
, ep
,
1899 spin_lock_bh(&ep
->ex_lock
);
1900 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
)) {
1901 spin_unlock_bh(&ep
->ex_lock
);
1902 /* drop hold for rec qual */
1903 fc_exch_release(ep
);
1906 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1907 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
1908 spin_unlock_bh(&ep
->ex_lock
);
1912 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
1913 * @fp: The RRQ frame, not freed here.
1915 static void fc_exch_els_rrq(struct fc_frame
*fp
)
1917 struct fc_lport
*lport
;
1918 struct fc_exch
*ep
= NULL
; /* request or subject exchange */
1919 struct fc_els_rrq
*rp
;
1922 enum fc_els_rjt_explan explan
;
1925 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
1926 explan
= ELS_EXPL_INV_LEN
;
1931 * lookup subject exchange.
1933 sid
= ntoh24(rp
->rrq_s_id
); /* subject source */
1934 xid
= fc_host_port_id(lport
->host
) == sid
?
1935 ntohs(rp
->rrq_ox_id
) : ntohs(rp
->rrq_rx_id
);
1936 ep
= fc_exch_lookup(lport
, xid
);
1937 explan
= ELS_EXPL_OXID_RXID
;
1940 spin_lock_bh(&ep
->ex_lock
);
1941 if (ep
->oxid
!= ntohs(rp
->rrq_ox_id
))
1943 if (ep
->rxid
!= ntohs(rp
->rrq_rx_id
) &&
1944 ep
->rxid
!= FC_XID_UNKNOWN
)
1946 explan
= ELS_EXPL_SID
;
1951 * Clear Recovery Qualifier state, and cancel timer if complete.
1953 if (ep
->esb_stat
& ESB_ST_REC_QUAL
) {
1954 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
1955 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec qual */
1957 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1958 if (cancel_delayed_work(&ep
->timeout_work
))
1959 atomic_dec(&ep
->ex_refcnt
); /* drop timer hold */
1962 spin_unlock_bh(&ep
->ex_lock
);
1971 spin_unlock_bh(&ep
->ex_lock
);
1973 fc_seq_ls_rjt(fp
, ELS_RJT_LOGIC
, explan
);
1976 fc_exch_release(ep
); /* drop hold from fc_exch_find */
1980 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
1981 * @lport: The local port to add the exchange manager to
1982 * @mp: The exchange manager to be added to the local port
1983 * @match: The match routine that indicates when this EM should be used
1985 struct fc_exch_mgr_anchor
*fc_exch_mgr_add(struct fc_lport
*lport
,
1986 struct fc_exch_mgr
*mp
,
1987 bool (*match
)(struct fc_frame
*))
1989 struct fc_exch_mgr_anchor
*ema
;
1991 ema
= kmalloc(sizeof(*ema
), GFP_ATOMIC
);
1997 /* add EM anchor to EM anchors list */
1998 list_add_tail(&ema
->ema_list
, &lport
->ema_list
);
1999 kref_get(&mp
->kref
);
2002 EXPORT_SYMBOL(fc_exch_mgr_add
);
2005 * fc_exch_mgr_destroy() - Destroy an exchange manager
2006 * @kref: The reference to the EM to be destroyed
2008 static void fc_exch_mgr_destroy(struct kref
*kref
)
2010 struct fc_exch_mgr
*mp
= container_of(kref
, struct fc_exch_mgr
, kref
);
2012 mempool_destroy(mp
->ep_pool
);
2013 free_percpu(mp
->pool
);
2018 * fc_exch_mgr_del() - Delete an EM from a local port's list
2019 * @ema: The exchange manager anchor identifying the EM to be deleted
2021 void fc_exch_mgr_del(struct fc_exch_mgr_anchor
*ema
)
2023 /* remove EM anchor from EM anchors list */
2024 list_del(&ema
->ema_list
);
2025 kref_put(&ema
->mp
->kref
, fc_exch_mgr_destroy
);
2028 EXPORT_SYMBOL(fc_exch_mgr_del
);
2031 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2032 * @src: Source lport to clone exchange managers from
2033 * @dst: New lport that takes references to all the exchange managers
2035 int fc_exch_mgr_list_clone(struct fc_lport
*src
, struct fc_lport
*dst
)
2037 struct fc_exch_mgr_anchor
*ema
, *tmp
;
2039 list_for_each_entry(ema
, &src
->ema_list
, ema_list
) {
2040 if (!fc_exch_mgr_add(dst
, ema
->mp
, ema
->match
))
2045 list_for_each_entry_safe(ema
, tmp
, &dst
->ema_list
, ema_list
)
2046 fc_exch_mgr_del(ema
);
2051 * fc_exch_mgr_alloc() - Allocate an exchange manager
2052 * @lport: The local port that the new EM will be associated with
2053 * @class: The default FC class for new exchanges
2054 * @min_xid: The minimum XID for exchanges from the new EM
2055 * @max_xid: The maximum XID for exchanges from the new EM
2056 * @match: The match routine for the new EM
2058 struct fc_exch_mgr
*fc_exch_mgr_alloc(struct fc_lport
*lport
,
2059 enum fc_class
class,
2060 u16 min_xid
, u16 max_xid
,
2061 bool (*match
)(struct fc_frame
*))
2063 struct fc_exch_mgr
*mp
;
2064 u16 pool_exch_range
;
2067 struct fc_exch_pool
*pool
;
2069 if (max_xid
<= min_xid
|| max_xid
== FC_XID_UNKNOWN
||
2070 (min_xid
& fc_cpu_mask
) != 0) {
2071 FC_LPORT_DBG(lport
, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
2077 * allocate memory for EM
2079 mp
= kzalloc(sizeof(struct fc_exch_mgr
), GFP_ATOMIC
);
2084 /* adjust em exch xid range for offload */
2085 mp
->min_xid
= min_xid
;
2086 mp
->max_xid
= max_xid
;
2088 mp
->ep_pool
= mempool_create_slab_pool(2, fc_em_cachep
);
2093 * Setup per cpu exch pool with entire exchange id range equally
2094 * divided across all cpus. The exch pointers array memory is
2095 * allocated for exch range per pool.
2097 pool_exch_range
= (mp
->max_xid
- mp
->min_xid
+ 1) / (fc_cpu_mask
+ 1);
2098 mp
->pool_max_index
= pool_exch_range
- 1;
2101 * Allocate and initialize per cpu exch pool
2103 pool_size
= sizeof(*pool
) + pool_exch_range
* sizeof(struct fc_exch
*);
2104 mp
->pool
= __alloc_percpu(pool_size
, __alignof__(struct fc_exch_pool
));
2107 for_each_possible_cpu(cpu
) {
2108 pool
= per_cpu_ptr(mp
->pool
, cpu
);
2109 spin_lock_init(&pool
->lock
);
2110 INIT_LIST_HEAD(&pool
->ex_list
);
2113 kref_init(&mp
->kref
);
2114 if (!fc_exch_mgr_add(lport
, mp
, match
)) {
2115 free_percpu(mp
->pool
);
2120 * Above kref_init() sets mp->kref to 1 and then
2121 * call to fc_exch_mgr_add incremented mp->kref again,
2122 * so adjust that extra increment.
2124 kref_put(&mp
->kref
, fc_exch_mgr_destroy
);
2128 mempool_destroy(mp
->ep_pool
);
2133 EXPORT_SYMBOL(fc_exch_mgr_alloc
);
2136 * fc_exch_mgr_free() - Free all exchange managers on a local port
2137 * @lport: The local port whose EMs are to be freed
2139 void fc_exch_mgr_free(struct fc_lport
*lport
)
2141 struct fc_exch_mgr_anchor
*ema
, *next
;
2143 flush_workqueue(fc_exch_workqueue
);
2144 list_for_each_entry_safe(ema
, next
, &lport
->ema_list
, ema_list
)
2145 fc_exch_mgr_del(ema
);
2147 EXPORT_SYMBOL(fc_exch_mgr_free
);
2150 * fc_exch_recv() - Handler for received frames
2151 * @lport: The local port the frame was received on
2152 * @fp: The received frame
2154 void fc_exch_recv(struct fc_lport
*lport
, struct fc_frame
*fp
)
2156 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
2157 struct fc_exch_mgr_anchor
*ema
;
2158 u32 f_ctl
, found
= 0;
2162 if (!lport
|| lport
->state
== LPORT_ST_DISABLED
) {
2163 FC_LPORT_DBG(lport
, "Receiving frames for an lport that "
2164 "has not been initialized correctly\n");
2169 f_ctl
= ntoh24(fh
->fh_f_ctl
);
2170 oxid
= ntohs(fh
->fh_ox_id
);
2171 if (f_ctl
& FC_FC_EX_CTX
) {
2172 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
2173 if ((oxid
>= ema
->mp
->min_xid
) &&
2174 (oxid
<= ema
->mp
->max_xid
)) {
2181 FC_LPORT_DBG(lport
, "Received response for out "
2182 "of range oxid:%hx\n", oxid
);
2187 ema
= list_entry(lport
->ema_list
.prev
, typeof(*ema
), ema_list
);
2190 * If frame is marked invalid, just drop it.
2192 switch (fr_eof(fp
)) {
2194 if (f_ctl
& FC_FC_END_SEQ
)
2195 skb_trim(fp_skb(fp
), fr_len(fp
) - FC_FC_FILL(f_ctl
));
2198 if (fh
->fh_type
== FC_TYPE_BLS
)
2199 fc_exch_recv_bls(ema
->mp
, fp
);
2200 else if ((f_ctl
& (FC_FC_EX_CTX
| FC_FC_SEQ_CTX
)) ==
2202 fc_exch_recv_seq_resp(ema
->mp
, fp
);
2203 else if (f_ctl
& FC_FC_SEQ_CTX
)
2204 fc_exch_recv_resp(ema
->mp
, fp
);
2205 else /* no EX_CTX and no SEQ_CTX */
2206 fc_exch_recv_req(lport
, ema
->mp
, fp
);
2209 FC_LPORT_DBG(lport
, "dropping invalid frame (eof %x)",
2214 EXPORT_SYMBOL(fc_exch_recv
);
2217 * fc_exch_init() - Initialize the exchange layer for a local port
2218 * @lport: The local port to initialize the exchange layer for
2220 int fc_exch_init(struct fc_lport
*lport
)
2222 if (!lport
->tt
.seq_start_next
)
2223 lport
->tt
.seq_start_next
= fc_seq_start_next
;
2225 if (!lport
->tt
.exch_seq_send
)
2226 lport
->tt
.exch_seq_send
= fc_exch_seq_send
;
2228 if (!lport
->tt
.seq_send
)
2229 lport
->tt
.seq_send
= fc_seq_send
;
2231 if (!lport
->tt
.seq_els_rsp_send
)
2232 lport
->tt
.seq_els_rsp_send
= fc_seq_els_rsp_send
;
2234 if (!lport
->tt
.exch_done
)
2235 lport
->tt
.exch_done
= fc_exch_done
;
2237 if (!lport
->tt
.exch_mgr_reset
)
2238 lport
->tt
.exch_mgr_reset
= fc_exch_mgr_reset
;
2240 if (!lport
->tt
.seq_exch_abort
)
2241 lport
->tt
.seq_exch_abort
= fc_seq_exch_abort
;
2243 if (!lport
->tt
.seq_assign
)
2244 lport
->tt
.seq_assign
= fc_seq_assign
;
2248 EXPORT_SYMBOL(fc_exch_init
);
2251 * fc_setup_exch_mgr() - Setup an exchange manager
2253 int fc_setup_exch_mgr()
2255 fc_em_cachep
= kmem_cache_create("libfc_em", sizeof(struct fc_exch
),
2256 0, SLAB_HWCACHE_ALIGN
, NULL
);
2261 * Initialize fc_cpu_mask and fc_cpu_order. The
2262 * fc_cpu_mask is set for nr_cpu_ids rounded up
2263 * to order of 2's * power and order is stored
2264 * in fc_cpu_order as this is later required in
2265 * mapping between an exch id and exch array index
2266 * in per cpu exch pool.
2268 * This round up is required to align fc_cpu_mask
2269 * to exchange id's lower bits such that all incoming
2270 * frames of an exchange gets delivered to the same
2271 * cpu on which exchange originated by simple bitwise
2272 * AND operation between fc_cpu_mask and exchange id.
2276 while (fc_cpu_mask
< nr_cpu_ids
) {
2282 fc_exch_workqueue
= create_singlethread_workqueue("fc_exch_workqueue");
2283 if (!fc_exch_workqueue
)
2289 * fc_destroy_exch_mgr() - Destroy an exchange manager
2291 void fc_destroy_exch_mgr()
2293 destroy_workqueue(fc_exch_workqueue
);
2294 kmem_cache_destroy(fc_em_cachep
);