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 * currently exchange mgr stats are updated but not used.
99 * either stats can be expose via sysfs or remove them
100 * all together if not used XXX
103 atomic_t no_free_exch
;
104 atomic_t no_free_exch_xid
;
105 atomic_t xid_not_found
;
107 atomic_t seq_not_found
;
108 atomic_t non_bls_resp
;
113 * struct fc_exch_mgr_anchor - primary structure for list of EMs
114 * @ema_list: Exchange Manager Anchor list
115 * @mp: Exchange Manager associated with this anchor
116 * @match: Routine to determine if this anchor's EM should be used
118 * When walking the list of anchors the match routine will be called
119 * for each anchor to determine if that EM should be used. The last
120 * anchor in the list will always match to handle any exchanges not
121 * handled by other EMs. The non-default EMs would be added to the
122 * anchor list by HW that provides FCoE offloads.
124 struct fc_exch_mgr_anchor
{
125 struct list_head ema_list
;
126 struct fc_exch_mgr
*mp
;
127 bool (*match
)(struct fc_frame
*);
130 static void fc_exch_rrq(struct fc_exch
*);
131 static void fc_seq_ls_acc(struct fc_frame
*);
132 static void fc_seq_ls_rjt(struct fc_frame
*, enum fc_els_rjt_reason
,
133 enum fc_els_rjt_explan
);
134 static void fc_exch_els_rec(struct fc_frame
*);
135 static void fc_exch_els_rrq(struct fc_frame
*);
138 * Internal implementation notes.
140 * The exchange manager is one by default in libfc but LLD may choose
141 * to have one per CPU. The sequence manager is one per exchange manager
142 * and currently never separated.
144 * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
145 * assigned by the Sequence Initiator that shall be unique for a specific
146 * D_ID and S_ID pair while the Sequence is open." Note that it isn't
147 * qualified by exchange ID, which one might think it would be.
148 * In practice this limits the number of open sequences and exchanges to 256
149 * per session. For most targets we could treat this limit as per exchange.
151 * The exchange and its sequence are freed when the last sequence is received.
152 * It's possible for the remote port to leave an exchange open without
153 * sending any sequences.
155 * Notes on reference counts:
157 * Exchanges are reference counted and exchange gets freed when the reference
158 * count becomes zero.
161 * Sequences are timed out for E_D_TOV and R_A_TOV.
163 * Sequence event handling:
165 * The following events may occur on initiator sequences:
168 * For now, the whole thing is sent.
170 * This applies only to class F.
171 * The sequence is marked complete.
173 * The upper layer calls fc_exch_done() when done
174 * with exchange and sequence tuple.
175 * RX-inferred completion.
176 * When we receive the next sequence on the same exchange, we can
177 * retire the previous sequence ID. (XXX not implemented).
179 * R_A_TOV frees the sequence ID. If we're waiting for ACK,
180 * E_D_TOV causes abort and calls upper layer response handler
181 * with FC_EX_TIMEOUT error.
187 * The following events may occur on recipient sequences:
190 * Allocate sequence for first frame received.
191 * Hold during receive handler.
192 * Release when final frame received.
193 * Keep status of last N of these for the ELS RES command. XXX TBD.
195 * Deallocate sequence
199 * For now, we neglect conditions where only part of a sequence was
200 * received or transmitted, or where out-of-order receipt is detected.
206 * The EM code run in a per-CPU worker thread.
208 * To protect against concurrency between a worker thread code and timers,
209 * sequence allocation and deallocation must be locked.
210 * - exchange refcnt can be done atomicly without locks.
211 * - sequence allocation must be locked by exch lock.
212 * - If the EM pool lock and ex_lock must be taken at the same time, then the
213 * EM pool lock must be taken before the ex_lock.
217 * opcode names for debugging.
219 static char *fc_exch_rctl_names
[] = FC_RCTL_NAMES_INIT
;
222 * fc_exch_name_lookup() - Lookup name by opcode
223 * @op: Opcode to be looked up
224 * @table: Opcode/name table
225 * @max_index: Index not to be exceeded
227 * This routine is used to determine a human-readable string identifying
230 static inline const char *fc_exch_name_lookup(unsigned int op
, char **table
,
231 unsigned int max_index
)
233 const char *name
= NULL
;
243 * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
244 * @op: The opcode to be looked up
246 static const char *fc_exch_rctl_name(unsigned int op
)
248 return fc_exch_name_lookup(op
, fc_exch_rctl_names
,
249 ARRAY_SIZE(fc_exch_rctl_names
));
253 * fc_exch_hold() - Increment an exchange's reference count
254 * @ep: Echange to be held
256 static inline void fc_exch_hold(struct fc_exch
*ep
)
258 atomic_inc(&ep
->ex_refcnt
);
262 * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
263 * and determine SOF and EOF.
264 * @ep: The exchange to that will use the header
265 * @fp: The frame whose header is to be modified
266 * @f_ctl: F_CTL bits that will be used for the frame header
268 * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
269 * fh_seq_id, fh_seq_cnt and the SOF and EOF.
271 static void fc_exch_setup_hdr(struct fc_exch
*ep
, struct fc_frame
*fp
,
274 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
277 fr_sof(fp
) = ep
->class;
279 fr_sof(fp
) = fc_sof_normal(ep
->class);
281 if (f_ctl
& FC_FC_END_SEQ
) {
282 fr_eof(fp
) = FC_EOF_T
;
283 if (fc_sof_needs_ack(ep
->class))
284 fr_eof(fp
) = FC_EOF_N
;
287 * The number of fill bytes to make the length a 4-byte
288 * multiple is the low order 2-bits of the f_ctl.
289 * The fill itself will have been cleared by the frame
291 * After this, the length will be even, as expected by
294 fill
= fr_len(fp
) & 3;
297 /* TODO, this may be a problem with fragmented skb */
298 skb_put(fp_skb(fp
), fill
);
299 hton24(fh
->fh_f_ctl
, f_ctl
| fill
);
302 WARN_ON(fr_len(fp
) % 4 != 0); /* no pad to non last frame */
303 fr_eof(fp
) = FC_EOF_N
;
307 * Initialize remainig fh fields
308 * from fc_fill_fc_hdr
310 fh
->fh_ox_id
= htons(ep
->oxid
);
311 fh
->fh_rx_id
= htons(ep
->rxid
);
312 fh
->fh_seq_id
= ep
->seq
.id
;
313 fh
->fh_seq_cnt
= htons(ep
->seq
.cnt
);
317 * fc_exch_release() - Decrement an exchange's reference count
318 * @ep: Exchange to be released
320 * If the reference count reaches zero and the exchange is complete,
323 static void fc_exch_release(struct fc_exch
*ep
)
325 struct fc_exch_mgr
*mp
;
327 if (atomic_dec_and_test(&ep
->ex_refcnt
)) {
330 ep
->destructor(&ep
->seq
, ep
->arg
);
331 WARN_ON(!(ep
->esb_stat
& ESB_ST_COMPLETE
));
332 mempool_free(ep
, mp
->ep_pool
);
337 * fc_exch_done_locked() - Complete an exchange with the exchange lock held
338 * @ep: The exchange that is complete
340 static int fc_exch_done_locked(struct fc_exch
*ep
)
345 * We must check for completion in case there are two threads
346 * tyring to complete this. But the rrq code will reuse the
347 * ep, and in that case we only clear the resp and set it as
348 * complete, so it can be reused by the timer to send the rrq.
351 if (ep
->state
& FC_EX_DONE
)
353 ep
->esb_stat
|= ESB_ST_COMPLETE
;
355 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
)) {
356 ep
->state
|= FC_EX_DONE
;
357 if (cancel_delayed_work(&ep
->timeout_work
))
358 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
365 * fc_exch_ptr_get() - Return an exchange from an exchange pool
366 * @pool: Exchange Pool to get an exchange from
367 * @index: Index of the exchange within the pool
369 * Use the index to get an exchange from within an exchange pool. exches
370 * will point to an array of exchange pointers. The index will select
371 * the exchange within the array.
373 static inline struct fc_exch
*fc_exch_ptr_get(struct fc_exch_pool
*pool
,
376 struct fc_exch
**exches
= (struct fc_exch
**)(pool
+ 1);
377 return exches
[index
];
381 * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
382 * @pool: The pool to assign the exchange to
383 * @index: The index in the pool where the exchange will be assigned
384 * @ep: The exchange to assign to the pool
386 static inline void fc_exch_ptr_set(struct fc_exch_pool
*pool
, u16 index
,
389 ((struct fc_exch
**)(pool
+ 1))[index
] = ep
;
393 * fc_exch_delete() - Delete an exchange
394 * @ep: The exchange to be deleted
396 static void fc_exch_delete(struct fc_exch
*ep
)
398 struct fc_exch_pool
*pool
;
401 spin_lock_bh(&pool
->lock
);
402 WARN_ON(pool
->total_exches
<= 0);
403 pool
->total_exches
--;
404 fc_exch_ptr_set(pool
, (ep
->xid
- ep
->em
->min_xid
) >> fc_cpu_order
,
406 list_del(&ep
->ex_list
);
407 spin_unlock_bh(&pool
->lock
);
408 fc_exch_release(ep
); /* drop hold for exch in mp */
412 * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
413 * the exchange lock held
414 * @ep: The exchange whose timer will start
415 * @timer_msec: The timeout period
417 * Used for upper level protocols to time out the exchange.
418 * The timer is cancelled when it fires or when the exchange completes.
420 static inline void fc_exch_timer_set_locked(struct fc_exch
*ep
,
421 unsigned int timer_msec
)
423 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
426 FC_EXCH_DBG(ep
, "Exchange timer armed\n");
428 if (queue_delayed_work(fc_exch_workqueue
, &ep
->timeout_work
,
429 msecs_to_jiffies(timer_msec
)))
430 fc_exch_hold(ep
); /* hold for timer */
434 * fc_exch_timer_set() - Lock the exchange and set the timer
435 * @ep: The exchange whose timer will start
436 * @timer_msec: The timeout period
438 static void fc_exch_timer_set(struct fc_exch
*ep
, unsigned int timer_msec
)
440 spin_lock_bh(&ep
->ex_lock
);
441 fc_exch_timer_set_locked(ep
, timer_msec
);
442 spin_unlock_bh(&ep
->ex_lock
);
446 * fc_seq_send() - Send a frame using existing sequence/exchange pair
447 * @lport: The local port that the exchange will be sent on
448 * @sp: The sequence to be sent
449 * @fp: The frame to be sent on the exchange
451 static int fc_seq_send(struct fc_lport
*lport
, struct fc_seq
*sp
,
455 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
459 ep
= fc_seq_exch(sp
);
460 WARN_ON((ep
->esb_stat
& ESB_ST_SEQ_INIT
) != ESB_ST_SEQ_INIT
);
462 f_ctl
= ntoh24(fh
->fh_f_ctl
);
463 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
464 fr_encaps(fp
) = ep
->encaps
;
467 * update sequence count if this frame is carrying
468 * multiple FC frames when sequence offload is enabled
471 if (fr_max_payload(fp
))
472 sp
->cnt
+= DIV_ROUND_UP((fr_len(fp
) - sizeof(*fh
)),
480 error
= lport
->tt
.frame_send(lport
, fp
);
483 * Update the exchange and sequence flags,
484 * assuming all frames for the sequence have been sent.
485 * We can only be called to send once for each sequence.
487 spin_lock_bh(&ep
->ex_lock
);
488 ep
->f_ctl
= f_ctl
& ~FC_FC_FIRST_SEQ
; /* not first seq */
489 if (f_ctl
& FC_FC_SEQ_INIT
)
490 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
491 spin_unlock_bh(&ep
->ex_lock
);
496 * fc_seq_alloc() - Allocate a sequence for a given exchange
497 * @ep: The exchange to allocate a new sequence for
498 * @seq_id: The sequence ID to be used
500 * We don't support multiple originated sequences on the same exchange.
501 * By implication, any previously originated sequence on this exchange
502 * is complete, and we reallocate the same sequence.
504 static struct fc_seq
*fc_seq_alloc(struct fc_exch
*ep
, u8 seq_id
)
516 * fc_seq_start_next_locked() - Allocate a new sequence on the same
517 * exchange as the supplied sequence
518 * @sp: The sequence/exchange to get a new sequence for
520 static struct fc_seq
*fc_seq_start_next_locked(struct fc_seq
*sp
)
522 struct fc_exch
*ep
= fc_seq_exch(sp
);
524 sp
= fc_seq_alloc(ep
, ep
->seq_id
++);
525 FC_EXCH_DBG(ep
, "f_ctl %6x seq %2x\n",
531 * fc_seq_start_next() - Lock the exchange and get a new sequence
532 * for a given sequence/exchange pair
533 * @sp: The sequence/exchange to get a new exchange for
535 static struct fc_seq
*fc_seq_start_next(struct fc_seq
*sp
)
537 struct fc_exch
*ep
= fc_seq_exch(sp
);
539 spin_lock_bh(&ep
->ex_lock
);
540 sp
= fc_seq_start_next_locked(sp
);
541 spin_unlock_bh(&ep
->ex_lock
);
547 * fc_seq_exch_abort() - Abort an exchange and sequence
548 * @req_sp: The sequence to be aborted
549 * @timer_msec: The period of time to wait before aborting
551 * Generally called because of a timeout or an abort from the upper layer.
553 static int fc_seq_exch_abort(const struct fc_seq
*req_sp
,
554 unsigned int timer_msec
)
561 ep
= fc_seq_exch(req_sp
);
563 spin_lock_bh(&ep
->ex_lock
);
564 if (ep
->esb_stat
& (ESB_ST_COMPLETE
| ESB_ST_ABNORMAL
) ||
565 ep
->state
& (FC_EX_DONE
| FC_EX_RST_CLEANUP
)) {
566 spin_unlock_bh(&ep
->ex_lock
);
571 * Send the abort on a new sequence if possible.
573 sp
= fc_seq_start_next_locked(&ep
->seq
);
575 spin_unlock_bh(&ep
->ex_lock
);
579 ep
->esb_stat
|= ESB_ST_SEQ_INIT
| ESB_ST_ABNORMAL
;
581 fc_exch_timer_set_locked(ep
, timer_msec
);
582 spin_unlock_bh(&ep
->ex_lock
);
585 * If not logged into the fabric, don't send ABTS but leave
586 * sequence active until next timeout.
592 * Send an abort for the sequence that timed out.
594 fp
= fc_frame_alloc(ep
->lp
, 0);
596 fc_fill_fc_hdr(fp
, FC_RCTL_BA_ABTS
, ep
->did
, ep
->sid
,
597 FC_TYPE_BLS
, FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
598 error
= fc_seq_send(ep
->lp
, sp
, fp
);
605 * fc_exch_timeout() - Handle exchange timer expiration
606 * @work: The work_struct identifying the exchange that timed out
608 static void fc_exch_timeout(struct work_struct
*work
)
610 struct fc_exch
*ep
= container_of(work
, struct fc_exch
,
612 struct fc_seq
*sp
= &ep
->seq
;
613 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
618 FC_EXCH_DBG(ep
, "Exchange timed out\n");
620 spin_lock_bh(&ep
->ex_lock
);
621 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
624 e_stat
= ep
->esb_stat
;
625 if (e_stat
& ESB_ST_COMPLETE
) {
626 ep
->esb_stat
= e_stat
& ~ESB_ST_REC_QUAL
;
627 spin_unlock_bh(&ep
->ex_lock
);
628 if (e_stat
& ESB_ST_REC_QUAL
)
635 if (e_stat
& ESB_ST_ABNORMAL
)
636 rc
= fc_exch_done_locked(ep
);
637 spin_unlock_bh(&ep
->ex_lock
);
641 resp(sp
, ERR_PTR(-FC_EX_TIMEOUT
), arg
);
642 fc_seq_exch_abort(sp
, 2 * ep
->r_a_tov
);
646 spin_unlock_bh(&ep
->ex_lock
);
649 * This release matches the hold taken when the timer was set.
655 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
656 * @lport: The local port that the exchange is for
657 * @mp: The exchange manager that will allocate the exchange
659 * Returns pointer to allocated fc_exch with exch lock held.
661 static struct fc_exch
*fc_exch_em_alloc(struct fc_lport
*lport
,
662 struct fc_exch_mgr
*mp
)
667 struct fc_exch_pool
*pool
;
669 /* allocate memory for exchange */
670 ep
= mempool_alloc(mp
->ep_pool
, GFP_ATOMIC
);
672 atomic_inc(&mp
->stats
.no_free_exch
);
675 memset(ep
, 0, sizeof(*ep
));
678 pool
= per_cpu_ptr(mp
->pool
, cpu
);
679 spin_lock_bh(&pool
->lock
);
681 index
= pool
->next_index
;
682 /* allocate new exch from pool */
683 while (fc_exch_ptr_get(pool
, index
)) {
684 index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
685 if (index
== pool
->next_index
)
688 pool
->next_index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
690 fc_exch_hold(ep
); /* hold for exch in mp */
691 spin_lock_init(&ep
->ex_lock
);
693 * Hold exch lock for caller to prevent fc_exch_reset()
694 * from releasing exch while fc_exch_alloc() caller is
695 * still working on exch.
697 spin_lock_bh(&ep
->ex_lock
);
699 fc_exch_ptr_set(pool
, index
, ep
);
700 list_add_tail(&ep
->ex_list
, &pool
->ex_list
);
701 fc_seq_alloc(ep
, ep
->seq_id
++);
702 pool
->total_exches
++;
703 spin_unlock_bh(&pool
->lock
);
708 ep
->oxid
= ep
->xid
= (index
<< fc_cpu_order
| cpu
) + mp
->min_xid
;
712 ep
->f_ctl
= FC_FC_FIRST_SEQ
; /* next seq is first seq */
713 ep
->rxid
= FC_XID_UNKNOWN
;
714 ep
->class = mp
->class;
715 INIT_DELAYED_WORK(&ep
->timeout_work
, fc_exch_timeout
);
719 spin_unlock_bh(&pool
->lock
);
720 atomic_inc(&mp
->stats
.no_free_exch_xid
);
721 mempool_free(ep
, mp
->ep_pool
);
726 * fc_exch_alloc() - Allocate an exchange from an EM on a
727 * local port's list of EMs.
728 * @lport: The local port that will own the exchange
729 * @fp: The FC frame that the exchange will be for
731 * This function walks the list of exchange manager(EM)
732 * anchors to select an EM for a new exchange allocation. The
733 * EM is selected when a NULL match function pointer is encountered
734 * or when a call to a match function returns true.
736 static inline struct fc_exch
*fc_exch_alloc(struct fc_lport
*lport
,
739 struct fc_exch_mgr_anchor
*ema
;
741 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
742 if (!ema
->match
|| ema
->match(fp
))
743 return fc_exch_em_alloc(lport
, ema
->mp
);
748 * fc_exch_find() - Lookup and hold an exchange
749 * @mp: The exchange manager to lookup the exchange from
750 * @xid: The XID of the exchange to look up
752 static struct fc_exch
*fc_exch_find(struct fc_exch_mgr
*mp
, u16 xid
)
754 struct fc_exch_pool
*pool
;
755 struct fc_exch
*ep
= NULL
;
757 if ((xid
>= mp
->min_xid
) && (xid
<= mp
->max_xid
)) {
758 pool
= per_cpu_ptr(mp
->pool
, xid
& fc_cpu_mask
);
759 spin_lock_bh(&pool
->lock
);
760 ep
= fc_exch_ptr_get(pool
, (xid
- mp
->min_xid
) >> fc_cpu_order
);
763 WARN_ON(ep
->xid
!= xid
);
765 spin_unlock_bh(&pool
->lock
);
772 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
773 * the memory allocated for the related objects may be freed.
774 * @sp: The sequence that has completed
776 static void fc_exch_done(struct fc_seq
*sp
)
778 struct fc_exch
*ep
= fc_seq_exch(sp
);
781 spin_lock_bh(&ep
->ex_lock
);
782 rc
= fc_exch_done_locked(ep
);
783 spin_unlock_bh(&ep
->ex_lock
);
789 * fc_exch_resp() - Allocate a new exchange for a response frame
790 * @lport: The local port that the exchange was for
791 * @mp: The exchange manager to allocate the exchange from
792 * @fp: The response frame
794 * Sets the responder ID in the frame header.
796 static struct fc_exch
*fc_exch_resp(struct fc_lport
*lport
,
797 struct fc_exch_mgr
*mp
,
801 struct fc_frame_header
*fh
;
803 ep
= fc_exch_alloc(lport
, fp
);
805 ep
->class = fc_frame_class(fp
);
808 * Set EX_CTX indicating we're responding on this exchange.
810 ep
->f_ctl
|= FC_FC_EX_CTX
; /* we're responding */
811 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not new */
812 fh
= fc_frame_header_get(fp
);
813 ep
->sid
= ntoh24(fh
->fh_d_id
);
814 ep
->did
= ntoh24(fh
->fh_s_id
);
818 * Allocated exchange has placed the XID in the
819 * originator field. Move it to the responder field,
820 * and set the originator XID from the frame.
823 ep
->oxid
= ntohs(fh
->fh_ox_id
);
824 ep
->esb_stat
|= ESB_ST_RESP
| ESB_ST_SEQ_INIT
;
825 if ((ntoh24(fh
->fh_f_ctl
) & FC_FC_SEQ_INIT
) == 0)
826 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
828 fc_exch_hold(ep
); /* hold for caller */
829 spin_unlock_bh(&ep
->ex_lock
); /* lock from fc_exch_alloc */
835 * fc_seq_lookup_recip() - Find a sequence where the other end
836 * originated the sequence
837 * @lport: The local port that the frame was sent to
838 * @mp: The Exchange Manager to lookup the exchange from
839 * @fp: The frame associated with the sequence we're looking for
841 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
842 * on the ep that should be released by the caller.
844 static enum fc_pf_rjt_reason
fc_seq_lookup_recip(struct fc_lport
*lport
,
845 struct fc_exch_mgr
*mp
,
848 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
849 struct fc_exch
*ep
= NULL
;
850 struct fc_seq
*sp
= NULL
;
851 enum fc_pf_rjt_reason reject
= FC_RJT_NONE
;
855 f_ctl
= ntoh24(fh
->fh_f_ctl
);
856 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != 0);
859 * Lookup or create the exchange if we will be creating the sequence.
861 if (f_ctl
& FC_FC_EX_CTX
) {
862 xid
= ntohs(fh
->fh_ox_id
); /* we originated exch */
863 ep
= fc_exch_find(mp
, xid
);
865 atomic_inc(&mp
->stats
.xid_not_found
);
866 reject
= FC_RJT_OX_ID
;
869 if (ep
->rxid
== FC_XID_UNKNOWN
)
870 ep
->rxid
= ntohs(fh
->fh_rx_id
);
871 else if (ep
->rxid
!= ntohs(fh
->fh_rx_id
)) {
872 reject
= FC_RJT_OX_ID
;
876 xid
= ntohs(fh
->fh_rx_id
); /* we are the responder */
879 * Special case for MDS issuing an ELS TEST with a
881 * XXX take this out once we do the proper reject.
883 if (xid
== 0 && fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
&&
884 fc_frame_payload_op(fp
) == ELS_TEST
) {
885 fh
->fh_rx_id
= htons(FC_XID_UNKNOWN
);
886 xid
= FC_XID_UNKNOWN
;
890 * new sequence - find the exchange
892 ep
= fc_exch_find(mp
, xid
);
893 if ((f_ctl
& FC_FC_FIRST_SEQ
) && fc_sof_is_init(fr_sof(fp
))) {
895 atomic_inc(&mp
->stats
.xid_busy
);
896 reject
= FC_RJT_RX_ID
;
899 ep
= fc_exch_resp(lport
, mp
, fp
);
901 reject
= FC_RJT_EXCH_EST
; /* XXX */
904 xid
= ep
->xid
; /* get our XID */
906 atomic_inc(&mp
->stats
.xid_not_found
);
907 reject
= FC_RJT_RX_ID
; /* XID not found */
913 * At this point, we have the exchange held.
914 * Find or create the sequence.
916 if (fc_sof_is_init(fr_sof(fp
))) {
918 sp
->ssb_stat
|= SSB_ST_RESP
;
919 sp
->id
= fh
->fh_seq_id
;
922 if (sp
->id
!= fh
->fh_seq_id
) {
923 atomic_inc(&mp
->stats
.seq_not_found
);
924 reject
= FC_RJT_SEQ_ID
; /* sequence/exch should exist */
928 WARN_ON(ep
!= fc_seq_exch(sp
));
930 if (f_ctl
& FC_FC_SEQ_INIT
)
931 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
937 fc_exch_done(&ep
->seq
);
938 fc_exch_release(ep
); /* hold from fc_exch_find/fc_exch_resp */
943 * fc_seq_lookup_orig() - Find a sequence where this end
944 * originated the sequence
945 * @mp: The Exchange Manager to lookup the exchange from
946 * @fp: The frame associated with the sequence we're looking for
948 * Does not hold the sequence for the caller.
950 static struct fc_seq
*fc_seq_lookup_orig(struct fc_exch_mgr
*mp
,
953 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
955 struct fc_seq
*sp
= NULL
;
959 f_ctl
= ntoh24(fh
->fh_f_ctl
);
960 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != FC_FC_SEQ_CTX
);
961 xid
= ntohs((f_ctl
& FC_FC_EX_CTX
) ? fh
->fh_ox_id
: fh
->fh_rx_id
);
962 ep
= fc_exch_find(mp
, xid
);
965 if (ep
->seq
.id
== fh
->fh_seq_id
) {
967 * Save the RX_ID if we didn't previously know it.
970 if ((f_ctl
& FC_FC_EX_CTX
) != 0 &&
971 ep
->rxid
== FC_XID_UNKNOWN
) {
972 ep
->rxid
= ntohs(fh
->fh_rx_id
);
980 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
981 * @ep: The exchange to set the addresses for
982 * @orig_id: The originator's ID
983 * @resp_id: The responder's ID
985 * Note this must be done before the first sequence of the exchange is sent.
987 static void fc_exch_set_addr(struct fc_exch
*ep
,
988 u32 orig_id
, u32 resp_id
)
991 if (ep
->esb_stat
& ESB_ST_RESP
) {
1001 * fc_seq_els_rsp_send() - Send an ELS response using infomation from
1002 * the existing sequence/exchange.
1003 * @fp: The received frame
1004 * @els_cmd: The ELS command to be sent
1005 * @els_data: The ELS data to be sent
1007 * The received frame is not freed.
1009 static void fc_seq_els_rsp_send(struct fc_frame
*fp
, enum fc_els_cmd els_cmd
,
1010 struct fc_seq_els_data
*els_data
)
1014 fc_seq_ls_rjt(fp
, els_data
->reason
, els_data
->explan
);
1020 fc_exch_els_rrq(fp
);
1023 fc_exch_els_rec(fp
);
1026 FC_LPORT_DBG(fr_dev(fp
), "Invalid ELS CMD:%x\n", els_cmd
);
1031 * fc_seq_send_last() - Send a sequence that is the last in the exchange
1032 * @sp: The sequence that is to be sent
1033 * @fp: The frame that will be sent on the sequence
1034 * @rctl: The R_CTL information to be sent
1035 * @fh_type: The frame header type
1037 static void fc_seq_send_last(struct fc_seq
*sp
, struct fc_frame
*fp
,
1038 enum fc_rctl rctl
, enum fc_fh_type fh_type
)
1041 struct fc_exch
*ep
= fc_seq_exch(sp
);
1043 f_ctl
= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
;
1045 fc_fill_fc_hdr(fp
, rctl
, ep
->did
, ep
->sid
, fh_type
, f_ctl
, 0);
1046 fc_seq_send(ep
->lp
, sp
, fp
);
1050 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
1051 * @sp: The sequence to send the ACK on
1052 * @rx_fp: The received frame that is being acknoledged
1054 * Send ACK_1 (or equiv.) indicating we received something.
1056 static void fc_seq_send_ack(struct fc_seq
*sp
, const struct fc_frame
*rx_fp
)
1058 struct fc_frame
*fp
;
1059 struct fc_frame_header
*rx_fh
;
1060 struct fc_frame_header
*fh
;
1061 struct fc_exch
*ep
= fc_seq_exch(sp
);
1062 struct fc_lport
*lport
= ep
->lp
;
1066 * Don't send ACKs for class 3.
1068 if (fc_sof_needs_ack(fr_sof(rx_fp
))) {
1069 fp
= fc_frame_alloc(lport
, 0);
1073 fh
= fc_frame_header_get(fp
);
1074 fh
->fh_r_ctl
= FC_RCTL_ACK_1
;
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).
1084 rx_fh
= fc_frame_header_get(rx_fp
);
1085 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1086 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1087 FC_FC_FIRST_SEQ
| FC_FC_LAST_SEQ
|
1088 FC_FC_END_SEQ
| FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1089 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1090 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1091 hton24(fh
->fh_f_ctl
, f_ctl
);
1093 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
1094 fh
->fh_seq_id
= rx_fh
->fh_seq_id
;
1095 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1096 fh
->fh_parm_offset
= htonl(1); /* ack single frame */
1098 fr_sof(fp
) = fr_sof(rx_fp
);
1099 if (f_ctl
& FC_FC_END_SEQ
)
1100 fr_eof(fp
) = FC_EOF_T
;
1102 fr_eof(fp
) = FC_EOF_N
;
1104 lport
->tt
.frame_send(lport
, fp
);
1109 * fc_exch_send_ba_rjt() - Send BLS Reject
1110 * @rx_fp: The frame being rejected
1111 * @reason: The reason the frame is being rejected
1112 * @explan: The explaination for the rejection
1114 * This is for rejecting BA_ABTS only.
1116 static void fc_exch_send_ba_rjt(struct fc_frame
*rx_fp
,
1117 enum fc_ba_rjt_reason reason
,
1118 enum fc_ba_rjt_explan explan
)
1120 struct fc_frame
*fp
;
1121 struct fc_frame_header
*rx_fh
;
1122 struct fc_frame_header
*fh
;
1123 struct fc_ba_rjt
*rp
;
1124 struct fc_lport
*lport
;
1127 lport
= fr_dev(rx_fp
);
1128 fp
= fc_frame_alloc(lport
, sizeof(*rp
));
1131 fh
= fc_frame_header_get(fp
);
1132 rx_fh
= fc_frame_header_get(rx_fp
);
1134 memset(fh
, 0, sizeof(*fh
) + sizeof(*rp
));
1136 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
1137 rp
->br_reason
= reason
;
1138 rp
->br_explan
= explan
;
1141 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1143 memcpy(fh
->fh_s_id
, rx_fh
->fh_d_id
, 3);
1144 memcpy(fh
->fh_d_id
, rx_fh
->fh_s_id
, 3);
1145 fh
->fh_ox_id
= rx_fh
->fh_ox_id
;
1146 fh
->fh_rx_id
= rx_fh
->fh_rx_id
;
1147 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1148 fh
->fh_r_ctl
= FC_RCTL_BA_RJT
;
1149 fh
->fh_type
= FC_TYPE_BLS
;
1152 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1153 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1154 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1155 * Last ACK uses bits 7-6 (continue sequence),
1156 * bits 5-4 are meaningful (what kind of ACK to use).
1157 * Always set LAST_SEQ, END_SEQ.
1159 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1160 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1161 FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1162 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1163 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1164 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
1165 f_ctl
&= ~FC_FC_FIRST_SEQ
;
1166 hton24(fh
->fh_f_ctl
, f_ctl
);
1168 fr_sof(fp
) = fc_sof_class(fr_sof(rx_fp
));
1169 fr_eof(fp
) = FC_EOF_T
;
1170 if (fc_sof_needs_ack(fr_sof(fp
)))
1171 fr_eof(fp
) = FC_EOF_N
;
1173 lport
->tt
.frame_send(lport
, fp
);
1177 * fc_exch_recv_abts() - Handle an incoming ABTS
1178 * @ep: The exchange the abort was on
1179 * @rx_fp: The ABTS frame
1181 * This would be for target mode usually, but could be due to lost
1182 * FCP transfer ready, confirm or RRQ. We always handle this as an
1183 * exchange abort, ignoring the parameter.
1185 static void fc_exch_recv_abts(struct fc_exch
*ep
, struct fc_frame
*rx_fp
)
1187 struct fc_frame
*fp
;
1188 struct fc_ba_acc
*ap
;
1189 struct fc_frame_header
*fh
;
1194 spin_lock_bh(&ep
->ex_lock
);
1195 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1196 spin_unlock_bh(&ep
->ex_lock
);
1199 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
))
1200 fc_exch_hold(ep
); /* hold for REC_QUAL */
1201 ep
->esb_stat
|= ESB_ST_ABNORMAL
| ESB_ST_REC_QUAL
;
1202 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
1204 fp
= fc_frame_alloc(ep
->lp
, sizeof(*ap
));
1206 spin_unlock_bh(&ep
->ex_lock
);
1209 fh
= fc_frame_header_get(fp
);
1210 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1211 memset(ap
, 0, sizeof(*ap
));
1213 ap
->ba_high_seq_cnt
= htons(0xffff);
1214 if (sp
->ssb_stat
& SSB_ST_RESP
) {
1215 ap
->ba_seq_id
= sp
->id
;
1216 ap
->ba_seq_id_val
= FC_BA_SEQ_ID_VAL
;
1217 ap
->ba_high_seq_cnt
= fh
->fh_seq_cnt
;
1218 ap
->ba_low_seq_cnt
= htons(sp
->cnt
);
1220 sp
= fc_seq_start_next_locked(sp
);
1221 spin_unlock_bh(&ep
->ex_lock
);
1222 fc_seq_send_last(sp
, fp
, FC_RCTL_BA_ACC
, FC_TYPE_BLS
);
1223 fc_frame_free(rx_fp
);
1227 fc_exch_send_ba_rjt(rx_fp
, FC_BA_RJT_UNABLE
, FC_BA_RJT_INV_XID
);
1229 fc_frame_free(rx_fp
);
1233 * fc_seq_assign() - Assign exchange and sequence for incoming request
1234 * @lport: The local port that received the request
1235 * @fp: The request frame
1237 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
1239 static struct fc_seq
*fc_seq_assign(struct fc_lport
*lport
, struct fc_frame
*fp
)
1241 struct fc_exch_mgr_anchor
*ema
;
1243 WARN_ON(lport
!= fr_dev(fp
));
1244 WARN_ON(fr_seq(fp
));
1247 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1248 if ((!ema
->match
|| ema
->match(fp
)) &&
1249 fc_seq_lookup_recip(lport
, ema
->mp
, fp
) != FC_RJT_NONE
)
1255 * fc_exch_recv_req() - Handler for an incoming request
1256 * @lport: The local port that received the request
1257 * @mp: The EM that the exchange is on
1258 * @fp: The request frame
1260 * This is used when the other end is originating the exchange
1263 static void fc_exch_recv_req(struct fc_lport
*lport
, struct fc_exch_mgr
*mp
,
1264 struct fc_frame
*fp
)
1266 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1267 struct fc_seq
*sp
= NULL
;
1268 struct fc_exch
*ep
= NULL
;
1269 enum fc_pf_rjt_reason reject
;
1271 /* We can have the wrong fc_lport at this point with NPIV, which is a
1272 * problem now that we know a new exchange needs to be allocated
1274 lport
= fc_vport_id_lookup(lport
, ntoh24(fh
->fh_d_id
));
1281 BUG_ON(fr_seq(fp
)); /* XXX remove later */
1284 * If the RX_ID is 0xffff, don't allocate an exchange.
1285 * The upper-level protocol may request one later, if needed.
1287 if (fh
->fh_rx_id
== htons(FC_XID_UNKNOWN
))
1288 return lport
->tt
.lport_recv(lport
, fp
);
1290 reject
= fc_seq_lookup_recip(lport
, mp
, fp
);
1291 if (reject
== FC_RJT_NONE
) {
1292 sp
= fr_seq(fp
); /* sequence will be held */
1293 ep
= fc_seq_exch(sp
);
1294 fc_seq_send_ack(sp
, fp
);
1295 ep
->encaps
= fr_encaps(fp
);
1298 * Call the receive function.
1300 * The receive function may allocate a new sequence
1301 * over the old one, so we shouldn't change the
1302 * sequence after this.
1304 * The frame will be freed by the receive function.
1305 * If new exch resp handler is valid then call that
1309 ep
->resp(sp
, fp
, ep
->arg
);
1311 lport
->tt
.lport_recv(lport
, fp
);
1312 fc_exch_release(ep
); /* release from lookup */
1314 FC_LPORT_DBG(lport
, "exch/seq lookup failed: reject %x\n",
1321 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1322 * end is the originator of the sequence that is a
1323 * response to our initial exchange
1324 * @mp: The EM that the exchange is on
1325 * @fp: The response frame
1327 static void fc_exch_recv_seq_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1329 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1334 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1338 ep
= fc_exch_find(mp
, ntohs(fh
->fh_ox_id
));
1340 atomic_inc(&mp
->stats
.xid_not_found
);
1343 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1344 atomic_inc(&mp
->stats
.xid_not_found
);
1347 if (ep
->rxid
== FC_XID_UNKNOWN
)
1348 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1349 if (ep
->sid
!= 0 && ep
->sid
!= ntoh24(fh
->fh_d_id
)) {
1350 atomic_inc(&mp
->stats
.xid_not_found
);
1353 if (ep
->did
!= ntoh24(fh
->fh_s_id
) &&
1354 ep
->did
!= FC_FID_FLOGI
) {
1355 atomic_inc(&mp
->stats
.xid_not_found
);
1360 if (fc_sof_is_init(sof
)) {
1361 sp
->ssb_stat
|= SSB_ST_RESP
;
1362 sp
->id
= fh
->fh_seq_id
;
1363 } else if (sp
->id
!= fh
->fh_seq_id
) {
1364 atomic_inc(&mp
->stats
.seq_not_found
);
1368 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1370 if (f_ctl
& FC_FC_SEQ_INIT
)
1371 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1373 if (fc_sof_needs_ack(sof
))
1374 fc_seq_send_ack(sp
, fp
);
1376 ex_resp_arg
= ep
->arg
;
1378 if (fh
->fh_type
!= FC_TYPE_FCP
&& fr_eof(fp
) == FC_EOF_T
&&
1379 (f_ctl
& (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) ==
1380 (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) {
1381 spin_lock_bh(&ep
->ex_lock
);
1382 rc
= fc_exch_done_locked(ep
);
1383 WARN_ON(fc_seq_exch(sp
) != ep
);
1384 spin_unlock_bh(&ep
->ex_lock
);
1390 * Call the receive function.
1391 * The sequence is held (has a refcnt) for us,
1392 * but not for the receive function.
1394 * The receive function may allocate a new sequence
1395 * over the old one, so we shouldn't change the
1396 * sequence after this.
1398 * The frame will be freed by the receive function.
1399 * If new exch resp handler is valid then call that
1403 resp(sp
, fp
, ex_resp_arg
);
1406 fc_exch_release(ep
);
1409 fc_exch_release(ep
);
1415 * fc_exch_recv_resp() - Handler for a sequence where other end is
1416 * responding to our sequence
1417 * @mp: The EM that the exchange is on
1418 * @fp: The response frame
1420 static void fc_exch_recv_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1424 sp
= fc_seq_lookup_orig(mp
, fp
); /* doesn't hold sequence */
1427 atomic_inc(&mp
->stats
.xid_not_found
);
1429 atomic_inc(&mp
->stats
.non_bls_resp
);
1435 * fc_exch_abts_resp() - Handler for a response to an ABT
1436 * @ep: The exchange that the frame is on
1437 * @fp: The response frame
1439 * This response would be to an ABTS cancelling an exchange or sequence.
1440 * The response can be either BA_ACC or BA_RJT
1442 static void fc_exch_abts_resp(struct fc_exch
*ep
, struct fc_frame
*fp
)
1444 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1446 struct fc_frame_header
*fh
;
1447 struct fc_ba_acc
*ap
;
1451 int rc
= 1, has_rec
= 0;
1453 fh
= fc_frame_header_get(fp
);
1454 FC_EXCH_DBG(ep
, "exch: BLS rctl %x - %s\n", fh
->fh_r_ctl
,
1455 fc_exch_rctl_name(fh
->fh_r_ctl
));
1457 if (cancel_delayed_work_sync(&ep
->timeout_work
))
1458 fc_exch_release(ep
); /* release from pending timer hold */
1460 spin_lock_bh(&ep
->ex_lock
);
1461 switch (fh
->fh_r_ctl
) {
1462 case FC_RCTL_BA_ACC
:
1463 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1468 * Decide whether to establish a Recovery Qualifier.
1469 * We do this if there is a non-empty SEQ_CNT range and
1470 * SEQ_ID is the same as the one we aborted.
1472 low
= ntohs(ap
->ba_low_seq_cnt
);
1473 high
= ntohs(ap
->ba_high_seq_cnt
);
1474 if ((ep
->esb_stat
& ESB_ST_REC_QUAL
) == 0 &&
1475 (ap
->ba_seq_id_val
!= FC_BA_SEQ_ID_VAL
||
1476 ap
->ba_seq_id
== ep
->seq_id
) && low
!= high
) {
1477 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1478 fc_exch_hold(ep
); /* hold for recovery qualifier */
1482 case FC_RCTL_BA_RJT
:
1489 ex_resp_arg
= ep
->arg
;
1491 /* do we need to do some other checks here. Can we reuse more of
1492 * fc_exch_recv_seq_resp
1496 * do we want to check END_SEQ as well as LAST_SEQ here?
1498 if (ep
->fh_type
!= FC_TYPE_FCP
&&
1499 ntoh24(fh
->fh_f_ctl
) & FC_FC_LAST_SEQ
)
1500 rc
= fc_exch_done_locked(ep
);
1501 spin_unlock_bh(&ep
->ex_lock
);
1506 resp(sp
, fp
, ex_resp_arg
);
1511 fc_exch_timer_set(ep
, ep
->r_a_tov
);
1516 * fc_exch_recv_bls() - Handler for a BLS sequence
1517 * @mp: The EM that the exchange is on
1518 * @fp: The request frame
1520 * The BLS frame is always a sequence initiated by the remote side.
1521 * We may be either the originator or recipient of the exchange.
1523 static void fc_exch_recv_bls(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1525 struct fc_frame_header
*fh
;
1529 fh
= fc_frame_header_get(fp
);
1530 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1533 ep
= fc_exch_find(mp
, (f_ctl
& FC_FC_EX_CTX
) ?
1534 ntohs(fh
->fh_ox_id
) : ntohs(fh
->fh_rx_id
));
1535 if (ep
&& (f_ctl
& FC_FC_SEQ_INIT
)) {
1536 spin_lock_bh(&ep
->ex_lock
);
1537 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1538 spin_unlock_bh(&ep
->ex_lock
);
1540 if (f_ctl
& FC_FC_SEQ_CTX
) {
1542 * A response to a sequence we initiated.
1543 * This should only be ACKs for class 2 or F.
1545 switch (fh
->fh_r_ctl
) {
1550 FC_EXCH_DBG(ep
, "BLS rctl %x - %s received",
1552 fc_exch_rctl_name(fh
->fh_r_ctl
));
1557 switch (fh
->fh_r_ctl
) {
1558 case FC_RCTL_BA_RJT
:
1559 case FC_RCTL_BA_ACC
:
1561 fc_exch_abts_resp(ep
, fp
);
1565 case FC_RCTL_BA_ABTS
:
1566 fc_exch_recv_abts(ep
, fp
);
1568 default: /* ignore junk */
1574 fc_exch_release(ep
); /* release hold taken by fc_exch_find */
1578 * fc_seq_ls_acc() - Accept sequence with LS_ACC
1579 * @rx_fp: The received frame, not freed here.
1581 * If this fails due to allocation or transmit congestion, assume the
1582 * originator will repeat the sequence.
1584 static void fc_seq_ls_acc(struct fc_frame
*rx_fp
)
1586 struct fc_lport
*lport
;
1587 struct fc_els_ls_acc
*acc
;
1588 struct fc_frame
*fp
;
1590 lport
= fr_dev(rx_fp
);
1591 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1594 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1595 memset(acc
, 0, sizeof(*acc
));
1596 acc
->la_cmd
= ELS_LS_ACC
;
1597 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1598 lport
->tt
.frame_send(lport
, fp
);
1602 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
1603 * @rx_fp: The received frame, not freed here.
1604 * @reason: The reason the sequence is being rejected
1605 * @explan: The explanation for the rejection
1607 * If this fails due to allocation or transmit congestion, assume the
1608 * originator will repeat the sequence.
1610 static void fc_seq_ls_rjt(struct fc_frame
*rx_fp
, enum fc_els_rjt_reason reason
,
1611 enum fc_els_rjt_explan explan
)
1613 struct fc_lport
*lport
;
1614 struct fc_els_ls_rjt
*rjt
;
1615 struct fc_frame
*fp
;
1617 lport
= fr_dev(rx_fp
);
1618 fp
= fc_frame_alloc(lport
, sizeof(*rjt
));
1621 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1622 memset(rjt
, 0, sizeof(*rjt
));
1623 rjt
->er_cmd
= ELS_LS_RJT
;
1624 rjt
->er_reason
= reason
;
1625 rjt
->er_explan
= explan
;
1626 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1627 lport
->tt
.frame_send(lport
, fp
);
1631 * fc_exch_reset() - Reset an exchange
1632 * @ep: The exchange to be reset
1634 static void fc_exch_reset(struct fc_exch
*ep
)
1637 void (*resp
)(struct fc_seq
*, struct fc_frame
*, void *);
1641 spin_lock_bh(&ep
->ex_lock
);
1642 ep
->state
|= FC_EX_RST_CLEANUP
;
1643 if (cancel_delayed_work(&ep
->timeout_work
))
1644 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
1647 if (ep
->esb_stat
& ESB_ST_REC_QUAL
)
1648 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec_qual */
1649 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
1652 rc
= fc_exch_done_locked(ep
);
1653 spin_unlock_bh(&ep
->ex_lock
);
1658 resp(sp
, ERR_PTR(-FC_EX_CLOSED
), arg
);
1662 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1663 * @lport: The local port that the exchange pool is on
1664 * @pool: The exchange pool to be reset
1665 * @sid: The source ID
1666 * @did: The destination ID
1668 * Resets a per cpu exches pool, releasing all of its sequences
1669 * and exchanges. If sid is non-zero then reset only exchanges
1670 * we sourced from the local port's FID. If did is non-zero then
1671 * only reset exchanges destined for the local port's FID.
1673 static void fc_exch_pool_reset(struct fc_lport
*lport
,
1674 struct fc_exch_pool
*pool
,
1678 struct fc_exch
*next
;
1680 spin_lock_bh(&pool
->lock
);
1682 list_for_each_entry_safe(ep
, next
, &pool
->ex_list
, ex_list
) {
1683 if ((lport
== ep
->lp
) &&
1684 (sid
== 0 || sid
== ep
->sid
) &&
1685 (did
== 0 || did
== ep
->did
)) {
1687 spin_unlock_bh(&pool
->lock
);
1691 fc_exch_release(ep
);
1692 spin_lock_bh(&pool
->lock
);
1695 * must restart loop incase while lock
1696 * was down multiple eps were released.
1701 spin_unlock_bh(&pool
->lock
);
1705 * fc_exch_mgr_reset() - Reset all EMs of a local port
1706 * @lport: The local port whose EMs are to be reset
1707 * @sid: The source ID
1708 * @did: The destination ID
1710 * Reset all EMs associated with a given local port. Release all
1711 * sequences and exchanges. If sid is non-zero then reset only the
1712 * exchanges sent from the local port's FID. If did is non-zero then
1713 * reset only exchanges destined for the local port's FID.
1715 void fc_exch_mgr_reset(struct fc_lport
*lport
, u32 sid
, u32 did
)
1717 struct fc_exch_mgr_anchor
*ema
;
1720 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
1721 for_each_possible_cpu(cpu
)
1722 fc_exch_pool_reset(lport
,
1723 per_cpu_ptr(ema
->mp
->pool
, cpu
),
1727 EXPORT_SYMBOL(fc_exch_mgr_reset
);
1730 * fc_exch_lookup() - find an exchange
1731 * @lport: The local port
1732 * @xid: The exchange ID
1734 * Returns exchange pointer with hold for caller, or NULL if not found.
1736 static struct fc_exch
*fc_exch_lookup(struct fc_lport
*lport
, u32 xid
)
1738 struct fc_exch_mgr_anchor
*ema
;
1740 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1741 if (ema
->mp
->min_xid
<= xid
&& xid
<= ema
->mp
->max_xid
)
1742 return fc_exch_find(ema
->mp
, xid
);
1747 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
1748 * @rfp: The REC frame, not freed here.
1750 * Note that the requesting port may be different than the S_ID in the request.
1752 static void fc_exch_els_rec(struct fc_frame
*rfp
)
1754 struct fc_lport
*lport
;
1755 struct fc_frame
*fp
;
1757 struct fc_els_rec
*rp
;
1758 struct fc_els_rec_acc
*acc
;
1759 enum fc_els_rjt_reason reason
= ELS_RJT_LOGIC
;
1760 enum fc_els_rjt_explan explan
;
1765 lport
= fr_dev(rfp
);
1766 rp
= fc_frame_payload_get(rfp
, sizeof(*rp
));
1767 explan
= ELS_EXPL_INV_LEN
;
1770 sid
= ntoh24(rp
->rec_s_id
);
1771 rxid
= ntohs(rp
->rec_rx_id
);
1772 oxid
= ntohs(rp
->rec_ox_id
);
1774 ep
= fc_exch_lookup(lport
,
1775 sid
== fc_host_port_id(lport
->host
) ? oxid
: rxid
);
1776 explan
= ELS_EXPL_OXID_RXID
;
1779 if (ep
->oid
!= sid
|| oxid
!= ep
->oxid
)
1781 if (rxid
!= FC_XID_UNKNOWN
&& rxid
!= ep
->rxid
)
1783 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1787 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1788 memset(acc
, 0, sizeof(*acc
));
1789 acc
->reca_cmd
= ELS_LS_ACC
;
1790 acc
->reca_ox_id
= rp
->rec_ox_id
;
1791 memcpy(acc
->reca_ofid
, rp
->rec_s_id
, 3);
1792 acc
->reca_rx_id
= htons(ep
->rxid
);
1793 if (ep
->sid
== ep
->oid
)
1794 hton24(acc
->reca_rfid
, ep
->did
);
1796 hton24(acc
->reca_rfid
, ep
->sid
);
1797 acc
->reca_fc4value
= htonl(ep
->seq
.rec_data
);
1798 acc
->reca_e_stat
= htonl(ep
->esb_stat
& (ESB_ST_RESP
|
1801 fc_fill_reply_hdr(fp
, rfp
, FC_RCTL_ELS_REP
, 0);
1802 lport
->tt
.frame_send(lport
, fp
);
1804 fc_exch_release(ep
);
1808 fc_exch_release(ep
);
1810 fc_seq_ls_rjt(rfp
, reason
, explan
);
1814 * fc_exch_rrq_resp() - Handler for RRQ responses
1815 * @sp: The sequence that the RRQ is on
1816 * @fp: The RRQ frame
1817 * @arg: The exchange that the RRQ is on
1819 * TODO: fix error handler.
1821 static void fc_exch_rrq_resp(struct fc_seq
*sp
, struct fc_frame
*fp
, void *arg
)
1823 struct fc_exch
*aborted_ep
= arg
;
1827 int err
= PTR_ERR(fp
);
1829 if (err
== -FC_EX_CLOSED
|| err
== -FC_EX_TIMEOUT
)
1831 FC_EXCH_DBG(aborted_ep
, "Cannot process RRQ, "
1832 "frame error %d\n", err
);
1836 op
= fc_frame_payload_op(fp
);
1841 FC_EXCH_DBG(aborted_ep
, "LS_RJT for RRQ");
1846 FC_EXCH_DBG(aborted_ep
, "unexpected response op %x "
1852 fc_exch_done(&aborted_ep
->seq
);
1853 /* drop hold for rec qual */
1854 fc_exch_release(aborted_ep
);
1859 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
1860 * @lport: The local port to send the frame on
1861 * @fp: The frame to be sent
1862 * @resp: The response handler for this request
1863 * @destructor: The destructor for the exchange
1864 * @arg: The argument to be passed to the response handler
1865 * @timer_msec: The timeout period for the exchange
1867 * The frame pointer with some of the header's fields must be
1868 * filled before calling this routine, those fields are:
1875 * - parameter or relative offset
1877 static struct fc_seq
*fc_exch_seq_send(struct fc_lport
*lport
,
1878 struct fc_frame
*fp
,
1879 void (*resp
)(struct fc_seq
*,
1880 struct fc_frame
*fp
,
1882 void (*destructor
)(struct fc_seq
*,
1884 void *arg
, u32 timer_msec
)
1887 struct fc_seq
*sp
= NULL
;
1888 struct fc_frame_header
*fh
;
1891 ep
= fc_exch_alloc(lport
, fp
);
1896 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1897 fh
= fc_frame_header_get(fp
);
1898 fc_exch_set_addr(ep
, ntoh24(fh
->fh_s_id
), ntoh24(fh
->fh_d_id
));
1900 ep
->destructor
= destructor
;
1902 ep
->r_a_tov
= FC_DEF_R_A_TOV
;
1906 ep
->fh_type
= fh
->fh_type
; /* save for possbile timeout handling */
1907 ep
->f_ctl
= ntoh24(fh
->fh_f_ctl
);
1908 fc_exch_setup_hdr(ep
, fp
, ep
->f_ctl
);
1911 if (ep
->xid
<= lport
->lro_xid
&& fh
->fh_r_ctl
== FC_RCTL_DD_UNSOL_CMD
)
1912 fc_fcp_ddp_setup(fr_fsp(fp
), ep
->xid
);
1914 if (unlikely(lport
->tt
.frame_send(lport
, fp
)))
1918 fc_exch_timer_set_locked(ep
, timer_msec
);
1919 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not first seq */
1921 if (ep
->f_ctl
& FC_FC_SEQ_INIT
)
1922 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
1923 spin_unlock_bh(&ep
->ex_lock
);
1926 rc
= fc_exch_done_locked(ep
);
1927 spin_unlock_bh(&ep
->ex_lock
);
1934 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
1935 * @ep: The exchange to send the RRQ on
1937 * This tells the remote port to stop blocking the use of
1938 * the exchange and the seq_cnt range.
1940 static void fc_exch_rrq(struct fc_exch
*ep
)
1942 struct fc_lport
*lport
;
1943 struct fc_els_rrq
*rrq
;
1944 struct fc_frame
*fp
;
1949 fp
= fc_frame_alloc(lport
, sizeof(*rrq
));
1953 rrq
= fc_frame_payload_get(fp
, sizeof(*rrq
));
1954 memset(rrq
, 0, sizeof(*rrq
));
1955 rrq
->rrq_cmd
= ELS_RRQ
;
1956 hton24(rrq
->rrq_s_id
, ep
->sid
);
1957 rrq
->rrq_ox_id
= htons(ep
->oxid
);
1958 rrq
->rrq_rx_id
= htons(ep
->rxid
);
1961 if (ep
->esb_stat
& ESB_ST_RESP
)
1964 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, did
,
1965 lport
->port_id
, FC_TYPE_ELS
,
1966 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1968 if (fc_exch_seq_send(lport
, fp
, fc_exch_rrq_resp
, NULL
, ep
,
1973 spin_lock_bh(&ep
->ex_lock
);
1974 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
)) {
1975 spin_unlock_bh(&ep
->ex_lock
);
1976 /* drop hold for rec qual */
1977 fc_exch_release(ep
);
1980 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1981 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
1982 spin_unlock_bh(&ep
->ex_lock
);
1986 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
1987 * @fp: The RRQ frame, not freed here.
1989 static void fc_exch_els_rrq(struct fc_frame
*fp
)
1991 struct fc_lport
*lport
;
1992 struct fc_exch
*ep
= NULL
; /* request or subject exchange */
1993 struct fc_els_rrq
*rp
;
1996 enum fc_els_rjt_explan explan
;
1999 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
2000 explan
= ELS_EXPL_INV_LEN
;
2005 * lookup subject exchange.
2007 sid
= ntoh24(rp
->rrq_s_id
); /* subject source */
2008 xid
= fc_host_port_id(lport
->host
) == sid
?
2009 ntohs(rp
->rrq_ox_id
) : ntohs(rp
->rrq_rx_id
);
2010 ep
= fc_exch_lookup(lport
, xid
);
2011 explan
= ELS_EXPL_OXID_RXID
;
2014 spin_lock_bh(&ep
->ex_lock
);
2015 if (ep
->oxid
!= ntohs(rp
->rrq_ox_id
))
2017 if (ep
->rxid
!= ntohs(rp
->rrq_rx_id
) &&
2018 ep
->rxid
!= FC_XID_UNKNOWN
)
2020 explan
= ELS_EXPL_SID
;
2025 * Clear Recovery Qualifier state, and cancel timer if complete.
2027 if (ep
->esb_stat
& ESB_ST_REC_QUAL
) {
2028 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
2029 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec qual */
2031 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
2032 if (cancel_delayed_work(&ep
->timeout_work
))
2033 atomic_dec(&ep
->ex_refcnt
); /* drop timer hold */
2036 spin_unlock_bh(&ep
->ex_lock
);
2045 spin_unlock_bh(&ep
->ex_lock
);
2047 fc_seq_ls_rjt(fp
, ELS_RJT_LOGIC
, explan
);
2050 fc_exch_release(ep
); /* drop hold from fc_exch_find */
2054 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
2055 * @lport: The local port to add the exchange manager to
2056 * @mp: The exchange manager to be added to the local port
2057 * @match: The match routine that indicates when this EM should be used
2059 struct fc_exch_mgr_anchor
*fc_exch_mgr_add(struct fc_lport
*lport
,
2060 struct fc_exch_mgr
*mp
,
2061 bool (*match
)(struct fc_frame
*))
2063 struct fc_exch_mgr_anchor
*ema
;
2065 ema
= kmalloc(sizeof(*ema
), GFP_ATOMIC
);
2071 /* add EM anchor to EM anchors list */
2072 list_add_tail(&ema
->ema_list
, &lport
->ema_list
);
2073 kref_get(&mp
->kref
);
2076 EXPORT_SYMBOL(fc_exch_mgr_add
);
2079 * fc_exch_mgr_destroy() - Destroy an exchange manager
2080 * @kref: The reference to the EM to be destroyed
2082 static void fc_exch_mgr_destroy(struct kref
*kref
)
2084 struct fc_exch_mgr
*mp
= container_of(kref
, struct fc_exch_mgr
, kref
);
2086 mempool_destroy(mp
->ep_pool
);
2087 free_percpu(mp
->pool
);
2092 * fc_exch_mgr_del() - Delete an EM from a local port's list
2093 * @ema: The exchange manager anchor identifying the EM to be deleted
2095 void fc_exch_mgr_del(struct fc_exch_mgr_anchor
*ema
)
2097 /* remove EM anchor from EM anchors list */
2098 list_del(&ema
->ema_list
);
2099 kref_put(&ema
->mp
->kref
, fc_exch_mgr_destroy
);
2102 EXPORT_SYMBOL(fc_exch_mgr_del
);
2105 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2106 * @src: Source lport to clone exchange managers from
2107 * @dst: New lport that takes references to all the exchange managers
2109 int fc_exch_mgr_list_clone(struct fc_lport
*src
, struct fc_lport
*dst
)
2111 struct fc_exch_mgr_anchor
*ema
, *tmp
;
2113 list_for_each_entry(ema
, &src
->ema_list
, ema_list
) {
2114 if (!fc_exch_mgr_add(dst
, ema
->mp
, ema
->match
))
2119 list_for_each_entry_safe(ema
, tmp
, &dst
->ema_list
, ema_list
)
2120 fc_exch_mgr_del(ema
);
2125 * fc_exch_mgr_alloc() - Allocate an exchange manager
2126 * @lport: The local port that the new EM will be associated with
2127 * @class: The default FC class for new exchanges
2128 * @min_xid: The minimum XID for exchanges from the new EM
2129 * @max_xid: The maximum XID for exchanges from the new EM
2130 * @match: The match routine for the new EM
2132 struct fc_exch_mgr
*fc_exch_mgr_alloc(struct fc_lport
*lport
,
2133 enum fc_class
class,
2134 u16 min_xid
, u16 max_xid
,
2135 bool (*match
)(struct fc_frame
*))
2137 struct fc_exch_mgr
*mp
;
2138 u16 pool_exch_range
;
2141 struct fc_exch_pool
*pool
;
2143 if (max_xid
<= min_xid
|| max_xid
== FC_XID_UNKNOWN
||
2144 (min_xid
& fc_cpu_mask
) != 0) {
2145 FC_LPORT_DBG(lport
, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
2151 * allocate memory for EM
2153 mp
= kzalloc(sizeof(struct fc_exch_mgr
), GFP_ATOMIC
);
2158 /* adjust em exch xid range for offload */
2159 mp
->min_xid
= min_xid
;
2160 mp
->max_xid
= max_xid
;
2162 mp
->ep_pool
= mempool_create_slab_pool(2, fc_em_cachep
);
2167 * Setup per cpu exch pool with entire exchange id range equally
2168 * divided across all cpus. The exch pointers array memory is
2169 * allocated for exch range per pool.
2171 pool_exch_range
= (mp
->max_xid
- mp
->min_xid
+ 1) / (fc_cpu_mask
+ 1);
2172 mp
->pool_max_index
= pool_exch_range
- 1;
2175 * Allocate and initialize per cpu exch pool
2177 pool_size
= sizeof(*pool
) + pool_exch_range
* sizeof(struct fc_exch
*);
2178 mp
->pool
= __alloc_percpu(pool_size
, __alignof__(struct fc_exch_pool
));
2181 for_each_possible_cpu(cpu
) {
2182 pool
= per_cpu_ptr(mp
->pool
, cpu
);
2183 spin_lock_init(&pool
->lock
);
2184 INIT_LIST_HEAD(&pool
->ex_list
);
2187 kref_init(&mp
->kref
);
2188 if (!fc_exch_mgr_add(lport
, mp
, match
)) {
2189 free_percpu(mp
->pool
);
2194 * Above kref_init() sets mp->kref to 1 and then
2195 * call to fc_exch_mgr_add incremented mp->kref again,
2196 * so adjust that extra increment.
2198 kref_put(&mp
->kref
, fc_exch_mgr_destroy
);
2202 mempool_destroy(mp
->ep_pool
);
2207 EXPORT_SYMBOL(fc_exch_mgr_alloc
);
2210 * fc_exch_mgr_free() - Free all exchange managers on a local port
2211 * @lport: The local port whose EMs are to be freed
2213 void fc_exch_mgr_free(struct fc_lport
*lport
)
2215 struct fc_exch_mgr_anchor
*ema
, *next
;
2217 flush_workqueue(fc_exch_workqueue
);
2218 list_for_each_entry_safe(ema
, next
, &lport
->ema_list
, ema_list
)
2219 fc_exch_mgr_del(ema
);
2221 EXPORT_SYMBOL(fc_exch_mgr_free
);
2224 * fc_exch_recv() - Handler for received frames
2225 * @lport: The local port the frame was received on
2226 * @fp: The received frame
2228 void fc_exch_recv(struct fc_lport
*lport
, struct fc_frame
*fp
)
2230 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
2231 struct fc_exch_mgr_anchor
*ema
;
2232 u32 f_ctl
, found
= 0;
2236 if (!lport
|| lport
->state
== LPORT_ST_DISABLED
) {
2237 FC_LPORT_DBG(lport
, "Receiving frames for an lport that "
2238 "has not been initialized correctly\n");
2243 f_ctl
= ntoh24(fh
->fh_f_ctl
);
2244 oxid
= ntohs(fh
->fh_ox_id
);
2245 if (f_ctl
& FC_FC_EX_CTX
) {
2246 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
2247 if ((oxid
>= ema
->mp
->min_xid
) &&
2248 (oxid
<= ema
->mp
->max_xid
)) {
2255 FC_LPORT_DBG(lport
, "Received response for out "
2256 "of range oxid:%hx\n", oxid
);
2261 ema
= list_entry(lport
->ema_list
.prev
, typeof(*ema
), ema_list
);
2264 * If frame is marked invalid, just drop it.
2266 switch (fr_eof(fp
)) {
2268 if (f_ctl
& FC_FC_END_SEQ
)
2269 skb_trim(fp_skb(fp
), fr_len(fp
) - FC_FC_FILL(f_ctl
));
2272 if (fh
->fh_type
== FC_TYPE_BLS
)
2273 fc_exch_recv_bls(ema
->mp
, fp
);
2274 else if ((f_ctl
& (FC_FC_EX_CTX
| FC_FC_SEQ_CTX
)) ==
2276 fc_exch_recv_seq_resp(ema
->mp
, fp
);
2277 else if (f_ctl
& FC_FC_SEQ_CTX
)
2278 fc_exch_recv_resp(ema
->mp
, fp
);
2279 else /* no EX_CTX and no SEQ_CTX */
2280 fc_exch_recv_req(lport
, ema
->mp
, fp
);
2283 FC_LPORT_DBG(lport
, "dropping invalid frame (eof %x)",
2288 EXPORT_SYMBOL(fc_exch_recv
);
2291 * fc_exch_init() - Initialize the exchange layer for a local port
2292 * @lport: The local port to initialize the exchange layer for
2294 int fc_exch_init(struct fc_lport
*lport
)
2296 if (!lport
->tt
.seq_start_next
)
2297 lport
->tt
.seq_start_next
= fc_seq_start_next
;
2299 if (!lport
->tt
.exch_seq_send
)
2300 lport
->tt
.exch_seq_send
= fc_exch_seq_send
;
2302 if (!lport
->tt
.seq_send
)
2303 lport
->tt
.seq_send
= fc_seq_send
;
2305 if (!lport
->tt
.seq_els_rsp_send
)
2306 lport
->tt
.seq_els_rsp_send
= fc_seq_els_rsp_send
;
2308 if (!lport
->tt
.exch_done
)
2309 lport
->tt
.exch_done
= fc_exch_done
;
2311 if (!lport
->tt
.exch_mgr_reset
)
2312 lport
->tt
.exch_mgr_reset
= fc_exch_mgr_reset
;
2314 if (!lport
->tt
.seq_exch_abort
)
2315 lport
->tt
.seq_exch_abort
= fc_seq_exch_abort
;
2317 if (!lport
->tt
.seq_assign
)
2318 lport
->tt
.seq_assign
= fc_seq_assign
;
2322 EXPORT_SYMBOL(fc_exch_init
);
2325 * fc_setup_exch_mgr() - Setup an exchange manager
2327 int fc_setup_exch_mgr()
2329 fc_em_cachep
= kmem_cache_create("libfc_em", sizeof(struct fc_exch
),
2330 0, SLAB_HWCACHE_ALIGN
, NULL
);
2335 * Initialize fc_cpu_mask and fc_cpu_order. The
2336 * fc_cpu_mask is set for nr_cpu_ids rounded up
2337 * to order of 2's * power and order is stored
2338 * in fc_cpu_order as this is later required in
2339 * mapping between an exch id and exch array index
2340 * in per cpu exch pool.
2342 * This round up is required to align fc_cpu_mask
2343 * to exchange id's lower bits such that all incoming
2344 * frames of an exchange gets delivered to the same
2345 * cpu on which exchange originated by simple bitwise
2346 * AND operation between fc_cpu_mask and exchange id.
2350 while (fc_cpu_mask
< nr_cpu_ids
) {
2356 fc_exch_workqueue
= create_singlethread_workqueue("fc_exch_workqueue");
2357 if (!fc_exch_workqueue
)
2363 * fc_destroy_exch_mgr() - Destroy an exchange manager
2365 void fc_destroy_exch_mgr()
2367 destroy_workqueue(fc_exch_workqueue
);
2368 kmem_cache_destroy(fc_em_cachep
);