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>
29 #include <linux/export.h>
31 #include <scsi/fc/fc_fc2.h>
33 #include <scsi/libfc.h>
34 #include <scsi/fc_encode.h>
38 u16 fc_cpu_mask
; /* cpu mask for possible cpus */
39 EXPORT_SYMBOL(fc_cpu_mask
);
40 static u16 fc_cpu_order
; /* 2's power to represent total possible cpus */
41 static struct kmem_cache
*fc_em_cachep
; /* cache for exchanges */
42 static struct workqueue_struct
*fc_exch_workqueue
;
45 * Structure and function definitions for managing Fibre Channel Exchanges
48 * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
50 * fc_exch_mgr holds the exchange state for an N port
52 * fc_exch holds state for one exchange and links to its active sequence.
54 * fc_seq holds the state for an individual sequence.
58 * struct fc_exch_pool - Per cpu exchange pool
59 * @next_index: Next possible free exchange index
60 * @total_exches: Total allocated exchanges
61 * @lock: Exch pool lock
62 * @ex_list: List of exchanges
64 * This structure manages per cpu exchanges in array of exchange pointers.
65 * This array is allocated followed by struct fc_exch_pool memory for
66 * assigned range of exchanges to per cpu pool.
72 /* two cache of free slot in exch array */
77 struct list_head ex_list
;
81 * struct fc_exch_mgr - The Exchange Manager (EM).
82 * @class: Default class for new sequences
83 * @kref: Reference counter
84 * @min_xid: Minimum exchange ID
85 * @max_xid: Maximum exchange ID
86 * @ep_pool: Reserved exchange pointers
87 * @pool_max_index: Max exch array index in exch pool
88 * @pool: Per cpu exch pool
89 * @stats: Statistics structure
91 * This structure is the center for creating exchanges and sequences.
92 * It manages the allocation of exchange IDs.
101 struct fc_exch_pool
*pool
;
104 * currently exchange mgr stats are updated but not used.
105 * either stats can be expose via sysfs or remove them
106 * all together if not used XXX
109 atomic_t no_free_exch
;
110 atomic_t no_free_exch_xid
;
111 atomic_t xid_not_found
;
113 atomic_t seq_not_found
;
114 atomic_t non_bls_resp
;
119 * struct fc_exch_mgr_anchor - primary structure for list of EMs
120 * @ema_list: Exchange Manager Anchor list
121 * @mp: Exchange Manager associated with this anchor
122 * @match: Routine to determine if this anchor's EM should be used
124 * When walking the list of anchors the match routine will be called
125 * for each anchor to determine if that EM should be used. The last
126 * anchor in the list will always match to handle any exchanges not
127 * handled by other EMs. The non-default EMs would be added to the
128 * anchor list by HW that provides FCoE offloads.
130 struct fc_exch_mgr_anchor
{
131 struct list_head ema_list
;
132 struct fc_exch_mgr
*mp
;
133 bool (*match
)(struct fc_frame
*);
136 static void fc_exch_rrq(struct fc_exch
*);
137 static void fc_seq_ls_acc(struct fc_frame
*);
138 static void fc_seq_ls_rjt(struct fc_frame
*, enum fc_els_rjt_reason
,
139 enum fc_els_rjt_explan
);
140 static void fc_exch_els_rec(struct fc_frame
*);
141 static void fc_exch_els_rrq(struct fc_frame
*);
144 * Internal implementation notes.
146 * The exchange manager is one by default in libfc but LLD may choose
147 * to have one per CPU. The sequence manager is one per exchange manager
148 * and currently never separated.
150 * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
151 * assigned by the Sequence Initiator that shall be unique for a specific
152 * D_ID and S_ID pair while the Sequence is open." Note that it isn't
153 * qualified by exchange ID, which one might think it would be.
154 * In practice this limits the number of open sequences and exchanges to 256
155 * per session. For most targets we could treat this limit as per exchange.
157 * The exchange and its sequence are freed when the last sequence is received.
158 * It's possible for the remote port to leave an exchange open without
159 * sending any sequences.
161 * Notes on reference counts:
163 * Exchanges are reference counted and exchange gets freed when the reference
164 * count becomes zero.
167 * Sequences are timed out for E_D_TOV and R_A_TOV.
169 * Sequence event handling:
171 * The following events may occur on initiator sequences:
174 * For now, the whole thing is sent.
176 * This applies only to class F.
177 * The sequence is marked complete.
179 * The upper layer calls fc_exch_done() when done
180 * with exchange and sequence tuple.
181 * RX-inferred completion.
182 * When we receive the next sequence on the same exchange, we can
183 * retire the previous sequence ID. (XXX not implemented).
185 * R_A_TOV frees the sequence ID. If we're waiting for ACK,
186 * E_D_TOV causes abort and calls upper layer response handler
187 * with FC_EX_TIMEOUT error.
193 * The following events may occur on recipient sequences:
196 * Allocate sequence for first frame received.
197 * Hold during receive handler.
198 * Release when final frame received.
199 * Keep status of last N of these for the ELS RES command. XXX TBD.
201 * Deallocate sequence
205 * For now, we neglect conditions where only part of a sequence was
206 * received or transmitted, or where out-of-order receipt is detected.
212 * The EM code run in a per-CPU worker thread.
214 * To protect against concurrency between a worker thread code and timers,
215 * sequence allocation and deallocation must be locked.
216 * - exchange refcnt can be done atomicly without locks.
217 * - sequence allocation must be locked by exch lock.
218 * - If the EM pool lock and ex_lock must be taken at the same time, then the
219 * EM pool lock must be taken before the ex_lock.
223 * opcode names for debugging.
225 static char *fc_exch_rctl_names
[] = FC_RCTL_NAMES_INIT
;
228 * fc_exch_name_lookup() - Lookup name by opcode
229 * @op: Opcode to be looked up
230 * @table: Opcode/name table
231 * @max_index: Index not to be exceeded
233 * This routine is used to determine a human-readable string identifying
236 static inline const char *fc_exch_name_lookup(unsigned int op
, char **table
,
237 unsigned int max_index
)
239 const char *name
= NULL
;
249 * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
250 * @op: The opcode to be looked up
252 static const char *fc_exch_rctl_name(unsigned int op
)
254 return fc_exch_name_lookup(op
, fc_exch_rctl_names
,
255 ARRAY_SIZE(fc_exch_rctl_names
));
259 * fc_exch_hold() - Increment an exchange's reference count
260 * @ep: Echange to be held
262 static inline void fc_exch_hold(struct fc_exch
*ep
)
264 atomic_inc(&ep
->ex_refcnt
);
268 * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
269 * and determine SOF and EOF.
270 * @ep: The exchange to that will use the header
271 * @fp: The frame whose header is to be modified
272 * @f_ctl: F_CTL bits that will be used for the frame header
274 * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
275 * fh_seq_id, fh_seq_cnt and the SOF and EOF.
277 static void fc_exch_setup_hdr(struct fc_exch
*ep
, struct fc_frame
*fp
,
280 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
283 fr_sof(fp
) = ep
->class;
285 fr_sof(fp
) = fc_sof_normal(ep
->class);
287 if (f_ctl
& FC_FC_END_SEQ
) {
288 fr_eof(fp
) = FC_EOF_T
;
289 if (fc_sof_needs_ack(ep
->class))
290 fr_eof(fp
) = FC_EOF_N
;
293 * The number of fill bytes to make the length a 4-byte
294 * multiple is the low order 2-bits of the f_ctl.
295 * The fill itself will have been cleared by the frame
297 * After this, the length will be even, as expected by
300 fill
= fr_len(fp
) & 3;
303 /* TODO, this may be a problem with fragmented skb */
304 skb_put(fp_skb(fp
), fill
);
305 hton24(fh
->fh_f_ctl
, f_ctl
| fill
);
308 WARN_ON(fr_len(fp
) % 4 != 0); /* no pad to non last frame */
309 fr_eof(fp
) = FC_EOF_N
;
313 * Initialize remainig fh fields
314 * from fc_fill_fc_hdr
316 fh
->fh_ox_id
= htons(ep
->oxid
);
317 fh
->fh_rx_id
= htons(ep
->rxid
);
318 fh
->fh_seq_id
= ep
->seq
.id
;
319 fh
->fh_seq_cnt
= htons(ep
->seq
.cnt
);
323 * fc_exch_release() - Decrement an exchange's reference count
324 * @ep: Exchange to be released
326 * If the reference count reaches zero and the exchange is complete,
329 static void fc_exch_release(struct fc_exch
*ep
)
331 struct fc_exch_mgr
*mp
;
333 if (atomic_dec_and_test(&ep
->ex_refcnt
)) {
336 ep
->destructor(&ep
->seq
, ep
->arg
);
337 WARN_ON(!(ep
->esb_stat
& ESB_ST_COMPLETE
));
338 mempool_free(ep
, mp
->ep_pool
);
343 * fc_exch_done_locked() - Complete an exchange with the exchange lock held
344 * @ep: The exchange that is complete
346 static int fc_exch_done_locked(struct fc_exch
*ep
)
351 * We must check for completion in case there are two threads
352 * tyring to complete this. But the rrq code will reuse the
353 * ep, and in that case we only clear the resp and set it as
354 * complete, so it can be reused by the timer to send the rrq.
357 if (ep
->state
& FC_EX_DONE
)
359 ep
->esb_stat
|= ESB_ST_COMPLETE
;
361 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
)) {
362 ep
->state
|= FC_EX_DONE
;
363 if (cancel_delayed_work(&ep
->timeout_work
))
364 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
371 * fc_exch_ptr_get() - Return an exchange from an exchange pool
372 * @pool: Exchange Pool to get an exchange from
373 * @index: Index of the exchange within the pool
375 * Use the index to get an exchange from within an exchange pool. exches
376 * will point to an array of exchange pointers. The index will select
377 * the exchange within the array.
379 static inline struct fc_exch
*fc_exch_ptr_get(struct fc_exch_pool
*pool
,
382 struct fc_exch
**exches
= (struct fc_exch
**)(pool
+ 1);
383 return exches
[index
];
387 * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
388 * @pool: The pool to assign the exchange to
389 * @index: The index in the pool where the exchange will be assigned
390 * @ep: The exchange to assign to the pool
392 static inline void fc_exch_ptr_set(struct fc_exch_pool
*pool
, u16 index
,
395 ((struct fc_exch
**)(pool
+ 1))[index
] = ep
;
399 * fc_exch_delete() - Delete an exchange
400 * @ep: The exchange to be deleted
402 static void fc_exch_delete(struct fc_exch
*ep
)
404 struct fc_exch_pool
*pool
;
408 spin_lock_bh(&pool
->lock
);
409 WARN_ON(pool
->total_exches
<= 0);
410 pool
->total_exches
--;
412 /* update cache of free slot */
413 index
= (ep
->xid
- ep
->em
->min_xid
) >> fc_cpu_order
;
414 if (pool
->left
== FC_XID_UNKNOWN
)
416 else if (pool
->right
== FC_XID_UNKNOWN
)
419 pool
->next_index
= index
;
421 fc_exch_ptr_set(pool
, index
, NULL
);
422 list_del(&ep
->ex_list
);
423 spin_unlock_bh(&pool
->lock
);
424 fc_exch_release(ep
); /* drop hold for exch in mp */
428 * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
429 * the exchange lock held
430 * @ep: The exchange whose timer will start
431 * @timer_msec: The timeout period
433 * Used for upper level protocols to time out the exchange.
434 * The timer is cancelled when it fires or when the exchange completes.
436 static inline void fc_exch_timer_set_locked(struct fc_exch
*ep
,
437 unsigned int timer_msec
)
439 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
442 FC_EXCH_DBG(ep
, "Exchange timer armed\n");
444 if (queue_delayed_work(fc_exch_workqueue
, &ep
->timeout_work
,
445 msecs_to_jiffies(timer_msec
)))
446 fc_exch_hold(ep
); /* hold for timer */
450 * fc_exch_timer_set() - Lock the exchange and set the timer
451 * @ep: The exchange whose timer will start
452 * @timer_msec: The timeout period
454 static void fc_exch_timer_set(struct fc_exch
*ep
, unsigned int timer_msec
)
456 spin_lock_bh(&ep
->ex_lock
);
457 fc_exch_timer_set_locked(ep
, timer_msec
);
458 spin_unlock_bh(&ep
->ex_lock
);
462 * fc_seq_send() - Send a frame using existing sequence/exchange pair
463 * @lport: The local port that the exchange will be sent on
464 * @sp: The sequence to be sent
465 * @fp: The frame to be sent on the exchange
467 static int fc_seq_send(struct fc_lport
*lport
, struct fc_seq
*sp
,
471 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
475 ep
= fc_seq_exch(sp
);
476 WARN_ON((ep
->esb_stat
& ESB_ST_SEQ_INIT
) != ESB_ST_SEQ_INIT
);
478 f_ctl
= ntoh24(fh
->fh_f_ctl
);
479 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
480 fr_encaps(fp
) = ep
->encaps
;
483 * update sequence count if this frame is carrying
484 * multiple FC frames when sequence offload is enabled
487 if (fr_max_payload(fp
))
488 sp
->cnt
+= DIV_ROUND_UP((fr_len(fp
) - sizeof(*fh
)),
496 error
= lport
->tt
.frame_send(lport
, fp
);
498 if (fh
->fh_type
== FC_TYPE_BLS
)
502 * Update the exchange and sequence flags,
503 * assuming all frames for the sequence have been sent.
504 * We can only be called to send once for each sequence.
506 spin_lock_bh(&ep
->ex_lock
);
507 ep
->f_ctl
= f_ctl
& ~FC_FC_FIRST_SEQ
; /* not first seq */
508 if (f_ctl
& FC_FC_SEQ_INIT
)
509 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
510 spin_unlock_bh(&ep
->ex_lock
);
515 * fc_seq_alloc() - Allocate a sequence for a given exchange
516 * @ep: The exchange to allocate a new sequence for
517 * @seq_id: The sequence ID to be used
519 * We don't support multiple originated sequences on the same exchange.
520 * By implication, any previously originated sequence on this exchange
521 * is complete, and we reallocate the same sequence.
523 static struct fc_seq
*fc_seq_alloc(struct fc_exch
*ep
, u8 seq_id
)
535 * fc_seq_start_next_locked() - Allocate a new sequence on the same
536 * exchange as the supplied sequence
537 * @sp: The sequence/exchange to get a new sequence for
539 static struct fc_seq
*fc_seq_start_next_locked(struct fc_seq
*sp
)
541 struct fc_exch
*ep
= fc_seq_exch(sp
);
543 sp
= fc_seq_alloc(ep
, ep
->seq_id
++);
544 FC_EXCH_DBG(ep
, "f_ctl %6x seq %2x\n",
550 * fc_seq_start_next() - Lock the exchange and get a new sequence
551 * for a given sequence/exchange pair
552 * @sp: The sequence/exchange to get a new exchange for
554 static struct fc_seq
*fc_seq_start_next(struct fc_seq
*sp
)
556 struct fc_exch
*ep
= fc_seq_exch(sp
);
558 spin_lock_bh(&ep
->ex_lock
);
559 sp
= fc_seq_start_next_locked(sp
);
560 spin_unlock_bh(&ep
->ex_lock
);
566 * Set the response handler for the exchange associated with a sequence.
568 static void fc_seq_set_resp(struct fc_seq
*sp
,
569 void (*resp
)(struct fc_seq
*, struct fc_frame
*,
573 struct fc_exch
*ep
= fc_seq_exch(sp
);
575 spin_lock_bh(&ep
->ex_lock
);
578 spin_unlock_bh(&ep
->ex_lock
);
582 * fc_exch_abort_locked() - Abort an exchange
583 * @ep: The exchange to be aborted
584 * @timer_msec: The period of time to wait before aborting
586 * Locking notes: Called with exch lock held
588 * Return value: 0 on success else error code
590 static int fc_exch_abort_locked(struct fc_exch
*ep
,
591 unsigned int timer_msec
)
597 if (ep
->esb_stat
& (ESB_ST_COMPLETE
| ESB_ST_ABNORMAL
) ||
598 ep
->state
& (FC_EX_DONE
| FC_EX_RST_CLEANUP
))
602 * Send the abort on a new sequence if possible.
604 sp
= fc_seq_start_next_locked(&ep
->seq
);
608 ep
->esb_stat
|= ESB_ST_SEQ_INIT
| ESB_ST_ABNORMAL
;
610 fc_exch_timer_set_locked(ep
, timer_msec
);
613 * If not logged into the fabric, don't send ABTS but leave
614 * sequence active until next timeout.
620 * Send an abort for the sequence that timed out.
622 fp
= fc_frame_alloc(ep
->lp
, 0);
624 fc_fill_fc_hdr(fp
, FC_RCTL_BA_ABTS
, ep
->did
, ep
->sid
,
625 FC_TYPE_BLS
, FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
626 error
= fc_seq_send(ep
->lp
, sp
, fp
);
633 * fc_seq_exch_abort() - Abort an exchange and sequence
634 * @req_sp: The sequence to be aborted
635 * @timer_msec: The period of time to wait before aborting
637 * Generally called because of a timeout or an abort from the upper layer.
639 * Return value: 0 on success else error code
641 static int fc_seq_exch_abort(const struct fc_seq
*req_sp
,
642 unsigned int timer_msec
)
647 ep
= fc_seq_exch(req_sp
);
648 spin_lock_bh(&ep
->ex_lock
);
649 error
= fc_exch_abort_locked(ep
, timer_msec
);
650 spin_unlock_bh(&ep
->ex_lock
);
655 * fc_exch_timeout() - Handle exchange timer expiration
656 * @work: The work_struct identifying the exchange that timed out
658 static void fc_exch_timeout(struct work_struct
*work
)
660 struct fc_exch
*ep
= container_of(work
, struct fc_exch
,
662 struct fc_seq
*sp
= &ep
->seq
;
663 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
668 FC_EXCH_DBG(ep
, "Exchange timed out\n");
670 spin_lock_bh(&ep
->ex_lock
);
671 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
674 e_stat
= ep
->esb_stat
;
675 if (e_stat
& ESB_ST_COMPLETE
) {
676 ep
->esb_stat
= e_stat
& ~ESB_ST_REC_QUAL
;
677 spin_unlock_bh(&ep
->ex_lock
);
678 if (e_stat
& ESB_ST_REC_QUAL
)
685 if (e_stat
& ESB_ST_ABNORMAL
)
686 rc
= fc_exch_done_locked(ep
);
687 spin_unlock_bh(&ep
->ex_lock
);
691 resp(sp
, ERR_PTR(-FC_EX_TIMEOUT
), arg
);
692 fc_seq_exch_abort(sp
, 2 * ep
->r_a_tov
);
696 spin_unlock_bh(&ep
->ex_lock
);
699 * This release matches the hold taken when the timer was set.
705 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
706 * @lport: The local port that the exchange is for
707 * @mp: The exchange manager that will allocate the exchange
709 * Returns pointer to allocated fc_exch with exch lock held.
711 static struct fc_exch
*fc_exch_em_alloc(struct fc_lport
*lport
,
712 struct fc_exch_mgr
*mp
)
717 struct fc_exch_pool
*pool
;
719 /* allocate memory for exchange */
720 ep
= mempool_alloc(mp
->ep_pool
, GFP_ATOMIC
);
722 atomic_inc(&mp
->stats
.no_free_exch
);
725 memset(ep
, 0, sizeof(*ep
));
728 pool
= per_cpu_ptr(mp
->pool
, cpu
);
729 spin_lock_bh(&pool
->lock
);
732 /* peek cache of free slot */
733 if (pool
->left
!= FC_XID_UNKNOWN
) {
735 pool
->left
= FC_XID_UNKNOWN
;
738 if (pool
->right
!= FC_XID_UNKNOWN
) {
740 pool
->right
= FC_XID_UNKNOWN
;
744 index
= pool
->next_index
;
745 /* allocate new exch from pool */
746 while (fc_exch_ptr_get(pool
, index
)) {
747 index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
748 if (index
== pool
->next_index
)
751 pool
->next_index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
753 fc_exch_hold(ep
); /* hold for exch in mp */
754 spin_lock_init(&ep
->ex_lock
);
756 * Hold exch lock for caller to prevent fc_exch_reset()
757 * from releasing exch while fc_exch_alloc() caller is
758 * still working on exch.
760 spin_lock_bh(&ep
->ex_lock
);
762 fc_exch_ptr_set(pool
, index
, ep
);
763 list_add_tail(&ep
->ex_list
, &pool
->ex_list
);
764 fc_seq_alloc(ep
, ep
->seq_id
++);
765 pool
->total_exches
++;
766 spin_unlock_bh(&pool
->lock
);
771 ep
->oxid
= ep
->xid
= (index
<< fc_cpu_order
| cpu
) + mp
->min_xid
;
775 ep
->f_ctl
= FC_FC_FIRST_SEQ
; /* next seq is first seq */
776 ep
->rxid
= FC_XID_UNKNOWN
;
777 ep
->class = mp
->class;
778 INIT_DELAYED_WORK(&ep
->timeout_work
, fc_exch_timeout
);
782 spin_unlock_bh(&pool
->lock
);
783 atomic_inc(&mp
->stats
.no_free_exch_xid
);
784 mempool_free(ep
, mp
->ep_pool
);
789 * fc_exch_alloc() - Allocate an exchange from an EM on a
790 * local port's list of EMs.
791 * @lport: The local port that will own the exchange
792 * @fp: The FC frame that the exchange will be for
794 * This function walks the list of exchange manager(EM)
795 * anchors to select an EM for a new exchange allocation. The
796 * EM is selected when a NULL match function pointer is encountered
797 * or when a call to a match function returns true.
799 static inline struct fc_exch
*fc_exch_alloc(struct fc_lport
*lport
,
802 struct fc_exch_mgr_anchor
*ema
;
804 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
805 if (!ema
->match
|| ema
->match(fp
))
806 return fc_exch_em_alloc(lport
, ema
->mp
);
811 * fc_exch_find() - Lookup and hold an exchange
812 * @mp: The exchange manager to lookup the exchange from
813 * @xid: The XID of the exchange to look up
815 static struct fc_exch
*fc_exch_find(struct fc_exch_mgr
*mp
, u16 xid
)
817 struct fc_exch_pool
*pool
;
818 struct fc_exch
*ep
= NULL
;
820 if ((xid
>= mp
->min_xid
) && (xid
<= mp
->max_xid
)) {
821 pool
= per_cpu_ptr(mp
->pool
, xid
& fc_cpu_mask
);
822 spin_lock_bh(&pool
->lock
);
823 ep
= fc_exch_ptr_get(pool
, (xid
- mp
->min_xid
) >> fc_cpu_order
);
824 if (ep
&& ep
->xid
== xid
)
826 spin_unlock_bh(&pool
->lock
);
833 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
834 * the memory allocated for the related objects may be freed.
835 * @sp: The sequence that has completed
837 static void fc_exch_done(struct fc_seq
*sp
)
839 struct fc_exch
*ep
= fc_seq_exch(sp
);
842 spin_lock_bh(&ep
->ex_lock
);
843 rc
= fc_exch_done_locked(ep
);
844 spin_unlock_bh(&ep
->ex_lock
);
850 * fc_exch_resp() - Allocate a new exchange for a response frame
851 * @lport: The local port that the exchange was for
852 * @mp: The exchange manager to allocate the exchange from
853 * @fp: The response frame
855 * Sets the responder ID in the frame header.
857 static struct fc_exch
*fc_exch_resp(struct fc_lport
*lport
,
858 struct fc_exch_mgr
*mp
,
862 struct fc_frame_header
*fh
;
864 ep
= fc_exch_alloc(lport
, fp
);
866 ep
->class = fc_frame_class(fp
);
869 * Set EX_CTX indicating we're responding on this exchange.
871 ep
->f_ctl
|= FC_FC_EX_CTX
; /* we're responding */
872 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not new */
873 fh
= fc_frame_header_get(fp
);
874 ep
->sid
= ntoh24(fh
->fh_d_id
);
875 ep
->did
= ntoh24(fh
->fh_s_id
);
879 * Allocated exchange has placed the XID in the
880 * originator field. Move it to the responder field,
881 * and set the originator XID from the frame.
884 ep
->oxid
= ntohs(fh
->fh_ox_id
);
885 ep
->esb_stat
|= ESB_ST_RESP
| ESB_ST_SEQ_INIT
;
886 if ((ntoh24(fh
->fh_f_ctl
) & FC_FC_SEQ_INIT
) == 0)
887 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
889 fc_exch_hold(ep
); /* hold for caller */
890 spin_unlock_bh(&ep
->ex_lock
); /* lock from fc_exch_alloc */
896 * fc_seq_lookup_recip() - Find a sequence where the other end
897 * originated the sequence
898 * @lport: The local port that the frame was sent to
899 * @mp: The Exchange Manager to lookup the exchange from
900 * @fp: The frame associated with the sequence we're looking for
902 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
903 * on the ep that should be released by the caller.
905 static enum fc_pf_rjt_reason
fc_seq_lookup_recip(struct fc_lport
*lport
,
906 struct fc_exch_mgr
*mp
,
909 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
910 struct fc_exch
*ep
= NULL
;
911 struct fc_seq
*sp
= NULL
;
912 enum fc_pf_rjt_reason reject
= FC_RJT_NONE
;
916 f_ctl
= ntoh24(fh
->fh_f_ctl
);
917 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != 0);
920 * Lookup or create the exchange if we will be creating the sequence.
922 if (f_ctl
& FC_FC_EX_CTX
) {
923 xid
= ntohs(fh
->fh_ox_id
); /* we originated exch */
924 ep
= fc_exch_find(mp
, xid
);
926 atomic_inc(&mp
->stats
.xid_not_found
);
927 reject
= FC_RJT_OX_ID
;
930 if (ep
->rxid
== FC_XID_UNKNOWN
)
931 ep
->rxid
= ntohs(fh
->fh_rx_id
);
932 else if (ep
->rxid
!= ntohs(fh
->fh_rx_id
)) {
933 reject
= FC_RJT_OX_ID
;
937 xid
= ntohs(fh
->fh_rx_id
); /* we are the responder */
940 * Special case for MDS issuing an ELS TEST with a
942 * XXX take this out once we do the proper reject.
944 if (xid
== 0 && fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
&&
945 fc_frame_payload_op(fp
) == ELS_TEST
) {
946 fh
->fh_rx_id
= htons(FC_XID_UNKNOWN
);
947 xid
= FC_XID_UNKNOWN
;
951 * new sequence - find the exchange
953 ep
= fc_exch_find(mp
, xid
);
954 if ((f_ctl
& FC_FC_FIRST_SEQ
) && fc_sof_is_init(fr_sof(fp
))) {
956 atomic_inc(&mp
->stats
.xid_busy
);
957 reject
= FC_RJT_RX_ID
;
960 ep
= fc_exch_resp(lport
, mp
, fp
);
962 reject
= FC_RJT_EXCH_EST
; /* XXX */
965 xid
= ep
->xid
; /* get our XID */
967 atomic_inc(&mp
->stats
.xid_not_found
);
968 reject
= FC_RJT_RX_ID
; /* XID not found */
974 * At this point, we have the exchange held.
975 * Find or create the sequence.
977 if (fc_sof_is_init(fr_sof(fp
))) {
979 sp
->ssb_stat
|= SSB_ST_RESP
;
980 sp
->id
= fh
->fh_seq_id
;
983 if (sp
->id
!= fh
->fh_seq_id
) {
984 atomic_inc(&mp
->stats
.seq_not_found
);
985 if (f_ctl
& FC_FC_END_SEQ
) {
987 * Update sequence_id based on incoming last
988 * frame of sequence exchange. This is needed
989 * for FCoE target where DDP has been used
990 * on target where, stack is indicated only
991 * about last frame's (payload _header) header.
992 * Whereas "seq_id" which is part of
993 * frame_header is allocated by initiator
994 * which is totally different from "seq_id"
995 * allocated when XFER_RDY was sent by target.
996 * To avoid false -ve which results into not
997 * sending RSP, hence write request on other
998 * end never finishes.
1000 spin_lock_bh(&ep
->ex_lock
);
1001 sp
->ssb_stat
|= SSB_ST_RESP
;
1002 sp
->id
= fh
->fh_seq_id
;
1003 spin_unlock_bh(&ep
->ex_lock
);
1005 /* sequence/exch should exist */
1006 reject
= FC_RJT_SEQ_ID
;
1011 WARN_ON(ep
!= fc_seq_exch(sp
));
1013 if (f_ctl
& FC_FC_SEQ_INIT
)
1014 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1020 fc_exch_done(&ep
->seq
);
1021 fc_exch_release(ep
); /* hold from fc_exch_find/fc_exch_resp */
1026 * fc_seq_lookup_orig() - Find a sequence where this end
1027 * originated the sequence
1028 * @mp: The Exchange Manager to lookup the exchange from
1029 * @fp: The frame associated with the sequence we're looking for
1031 * Does not hold the sequence for the caller.
1033 static struct fc_seq
*fc_seq_lookup_orig(struct fc_exch_mgr
*mp
,
1034 struct fc_frame
*fp
)
1036 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1038 struct fc_seq
*sp
= NULL
;
1042 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1043 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != FC_FC_SEQ_CTX
);
1044 xid
= ntohs((f_ctl
& FC_FC_EX_CTX
) ? fh
->fh_ox_id
: fh
->fh_rx_id
);
1045 ep
= fc_exch_find(mp
, xid
);
1048 if (ep
->seq
.id
== fh
->fh_seq_id
) {
1050 * Save the RX_ID if we didn't previously know it.
1053 if ((f_ctl
& FC_FC_EX_CTX
) != 0 &&
1054 ep
->rxid
== FC_XID_UNKNOWN
) {
1055 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1058 fc_exch_release(ep
);
1063 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
1064 * @ep: The exchange to set the addresses for
1065 * @orig_id: The originator's ID
1066 * @resp_id: The responder's ID
1068 * Note this must be done before the first sequence of the exchange is sent.
1070 static void fc_exch_set_addr(struct fc_exch
*ep
,
1071 u32 orig_id
, u32 resp_id
)
1074 if (ep
->esb_stat
& ESB_ST_RESP
) {
1084 * fc_seq_els_rsp_send() - Send an ELS response using information from
1085 * the existing sequence/exchange.
1086 * @fp: The received frame
1087 * @els_cmd: The ELS command to be sent
1088 * @els_data: The ELS data to be sent
1090 * The received frame is not freed.
1092 static void fc_seq_els_rsp_send(struct fc_frame
*fp
, enum fc_els_cmd els_cmd
,
1093 struct fc_seq_els_data
*els_data
)
1097 fc_seq_ls_rjt(fp
, els_data
->reason
, els_data
->explan
);
1103 fc_exch_els_rrq(fp
);
1106 fc_exch_els_rec(fp
);
1109 FC_LPORT_DBG(fr_dev(fp
), "Invalid ELS CMD:%x\n", els_cmd
);
1114 * fc_seq_send_last() - Send a sequence that is the last in the exchange
1115 * @sp: The sequence that is to be sent
1116 * @fp: The frame that will be sent on the sequence
1117 * @rctl: The R_CTL information to be sent
1118 * @fh_type: The frame header type
1120 static void fc_seq_send_last(struct fc_seq
*sp
, struct fc_frame
*fp
,
1121 enum fc_rctl rctl
, enum fc_fh_type fh_type
)
1124 struct fc_exch
*ep
= fc_seq_exch(sp
);
1126 f_ctl
= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
;
1128 fc_fill_fc_hdr(fp
, rctl
, ep
->did
, ep
->sid
, fh_type
, f_ctl
, 0);
1129 fc_seq_send(ep
->lp
, sp
, fp
);
1133 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
1134 * @sp: The sequence to send the ACK on
1135 * @rx_fp: The received frame that is being acknoledged
1137 * Send ACK_1 (or equiv.) indicating we received something.
1139 static void fc_seq_send_ack(struct fc_seq
*sp
, const struct fc_frame
*rx_fp
)
1141 struct fc_frame
*fp
;
1142 struct fc_frame_header
*rx_fh
;
1143 struct fc_frame_header
*fh
;
1144 struct fc_exch
*ep
= fc_seq_exch(sp
);
1145 struct fc_lport
*lport
= ep
->lp
;
1149 * Don't send ACKs for class 3.
1151 if (fc_sof_needs_ack(fr_sof(rx_fp
))) {
1152 fp
= fc_frame_alloc(lport
, 0);
1156 fh
= fc_frame_header_get(fp
);
1157 fh
->fh_r_ctl
= FC_RCTL_ACK_1
;
1158 fh
->fh_type
= FC_TYPE_BLS
;
1161 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1162 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1163 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1164 * Last ACK uses bits 7-6 (continue sequence),
1165 * bits 5-4 are meaningful (what kind of ACK to use).
1167 rx_fh
= fc_frame_header_get(rx_fp
);
1168 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1169 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1170 FC_FC_FIRST_SEQ
| FC_FC_LAST_SEQ
|
1171 FC_FC_END_SEQ
| FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1172 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1173 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1174 hton24(fh
->fh_f_ctl
, f_ctl
);
1176 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
1177 fh
->fh_seq_id
= rx_fh
->fh_seq_id
;
1178 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1179 fh
->fh_parm_offset
= htonl(1); /* ack single frame */
1181 fr_sof(fp
) = fr_sof(rx_fp
);
1182 if (f_ctl
& FC_FC_END_SEQ
)
1183 fr_eof(fp
) = FC_EOF_T
;
1185 fr_eof(fp
) = FC_EOF_N
;
1187 lport
->tt
.frame_send(lport
, fp
);
1192 * fc_exch_send_ba_rjt() - Send BLS Reject
1193 * @rx_fp: The frame being rejected
1194 * @reason: The reason the frame is being rejected
1195 * @explan: The explanation for the rejection
1197 * This is for rejecting BA_ABTS only.
1199 static void fc_exch_send_ba_rjt(struct fc_frame
*rx_fp
,
1200 enum fc_ba_rjt_reason reason
,
1201 enum fc_ba_rjt_explan explan
)
1203 struct fc_frame
*fp
;
1204 struct fc_frame_header
*rx_fh
;
1205 struct fc_frame_header
*fh
;
1206 struct fc_ba_rjt
*rp
;
1207 struct fc_lport
*lport
;
1210 lport
= fr_dev(rx_fp
);
1211 fp
= fc_frame_alloc(lport
, sizeof(*rp
));
1214 fh
= fc_frame_header_get(fp
);
1215 rx_fh
= fc_frame_header_get(rx_fp
);
1217 memset(fh
, 0, sizeof(*fh
) + sizeof(*rp
));
1219 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
1220 rp
->br_reason
= reason
;
1221 rp
->br_explan
= explan
;
1224 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1226 memcpy(fh
->fh_s_id
, rx_fh
->fh_d_id
, 3);
1227 memcpy(fh
->fh_d_id
, rx_fh
->fh_s_id
, 3);
1228 fh
->fh_ox_id
= rx_fh
->fh_ox_id
;
1229 fh
->fh_rx_id
= rx_fh
->fh_rx_id
;
1230 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1231 fh
->fh_r_ctl
= FC_RCTL_BA_RJT
;
1232 fh
->fh_type
= FC_TYPE_BLS
;
1235 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1236 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1237 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1238 * Last ACK uses bits 7-6 (continue sequence),
1239 * bits 5-4 are meaningful (what kind of ACK to use).
1240 * Always set LAST_SEQ, END_SEQ.
1242 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1243 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1244 FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1245 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1246 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1247 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
1248 f_ctl
&= ~FC_FC_FIRST_SEQ
;
1249 hton24(fh
->fh_f_ctl
, f_ctl
);
1251 fr_sof(fp
) = fc_sof_class(fr_sof(rx_fp
));
1252 fr_eof(fp
) = FC_EOF_T
;
1253 if (fc_sof_needs_ack(fr_sof(fp
)))
1254 fr_eof(fp
) = FC_EOF_N
;
1256 lport
->tt
.frame_send(lport
, fp
);
1260 * fc_exch_recv_abts() - Handle an incoming ABTS
1261 * @ep: The exchange the abort was on
1262 * @rx_fp: The ABTS frame
1264 * This would be for target mode usually, but could be due to lost
1265 * FCP transfer ready, confirm or RRQ. We always handle this as an
1266 * exchange abort, ignoring the parameter.
1268 static void fc_exch_recv_abts(struct fc_exch
*ep
, struct fc_frame
*rx_fp
)
1270 struct fc_frame
*fp
;
1271 struct fc_ba_acc
*ap
;
1272 struct fc_frame_header
*fh
;
1277 spin_lock_bh(&ep
->ex_lock
);
1278 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1279 spin_unlock_bh(&ep
->ex_lock
);
1282 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
))
1283 fc_exch_hold(ep
); /* hold for REC_QUAL */
1284 ep
->esb_stat
|= ESB_ST_ABNORMAL
| ESB_ST_REC_QUAL
;
1285 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
1287 fp
= fc_frame_alloc(ep
->lp
, sizeof(*ap
));
1289 spin_unlock_bh(&ep
->ex_lock
);
1292 fh
= fc_frame_header_get(fp
);
1293 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1294 memset(ap
, 0, sizeof(*ap
));
1296 ap
->ba_high_seq_cnt
= htons(0xffff);
1297 if (sp
->ssb_stat
& SSB_ST_RESP
) {
1298 ap
->ba_seq_id
= sp
->id
;
1299 ap
->ba_seq_id_val
= FC_BA_SEQ_ID_VAL
;
1300 ap
->ba_high_seq_cnt
= fh
->fh_seq_cnt
;
1301 ap
->ba_low_seq_cnt
= htons(sp
->cnt
);
1303 sp
= fc_seq_start_next_locked(sp
);
1304 spin_unlock_bh(&ep
->ex_lock
);
1305 fc_seq_send_last(sp
, fp
, FC_RCTL_BA_ACC
, FC_TYPE_BLS
);
1306 fc_frame_free(rx_fp
);
1310 fc_exch_send_ba_rjt(rx_fp
, FC_BA_RJT_UNABLE
, FC_BA_RJT_INV_XID
);
1312 fc_frame_free(rx_fp
);
1316 * fc_seq_assign() - Assign exchange and sequence for incoming request
1317 * @lport: The local port that received the request
1318 * @fp: The request frame
1320 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
1321 * A reference will be held on the exchange/sequence for the caller, which
1322 * must call fc_seq_release().
1324 static struct fc_seq
*fc_seq_assign(struct fc_lport
*lport
, struct fc_frame
*fp
)
1326 struct fc_exch_mgr_anchor
*ema
;
1328 WARN_ON(lport
!= fr_dev(fp
));
1329 WARN_ON(fr_seq(fp
));
1332 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1333 if ((!ema
->match
|| ema
->match(fp
)) &&
1334 fc_seq_lookup_recip(lport
, ema
->mp
, fp
) == FC_RJT_NONE
)
1340 * fc_seq_release() - Release the hold
1341 * @sp: The sequence.
1343 static void fc_seq_release(struct fc_seq
*sp
)
1345 fc_exch_release(fc_seq_exch(sp
));
1349 * fc_exch_recv_req() - Handler for an incoming request
1350 * @lport: The local port that received the request
1351 * @mp: The EM that the exchange is on
1352 * @fp: The request frame
1354 * This is used when the other end is originating the exchange
1357 static void fc_exch_recv_req(struct fc_lport
*lport
, struct fc_exch_mgr
*mp
,
1358 struct fc_frame
*fp
)
1360 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1361 struct fc_seq
*sp
= NULL
;
1362 struct fc_exch
*ep
= NULL
;
1363 enum fc_pf_rjt_reason reject
;
1365 /* We can have the wrong fc_lport at this point with NPIV, which is a
1366 * problem now that we know a new exchange needs to be allocated
1368 lport
= fc_vport_id_lookup(lport
, ntoh24(fh
->fh_d_id
));
1375 BUG_ON(fr_seq(fp
)); /* XXX remove later */
1378 * If the RX_ID is 0xffff, don't allocate an exchange.
1379 * The upper-level protocol may request one later, if needed.
1381 if (fh
->fh_rx_id
== htons(FC_XID_UNKNOWN
))
1382 return lport
->tt
.lport_recv(lport
, fp
);
1384 reject
= fc_seq_lookup_recip(lport
, mp
, fp
);
1385 if (reject
== FC_RJT_NONE
) {
1386 sp
= fr_seq(fp
); /* sequence will be held */
1387 ep
= fc_seq_exch(sp
);
1388 fc_seq_send_ack(sp
, fp
);
1389 ep
->encaps
= fr_encaps(fp
);
1392 * Call 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 ep
->resp(sp
, fp
, ep
->arg
);
1405 lport
->tt
.lport_recv(lport
, fp
);
1406 fc_exch_release(ep
); /* release from lookup */
1408 FC_LPORT_DBG(lport
, "exch/seq lookup failed: reject %x\n",
1415 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1416 * end is the originator of the sequence that is a
1417 * response to our initial exchange
1418 * @mp: The EM that the exchange is on
1419 * @fp: The response frame
1421 static void fc_exch_recv_seq_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1423 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1428 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1432 ep
= fc_exch_find(mp
, ntohs(fh
->fh_ox_id
));
1434 atomic_inc(&mp
->stats
.xid_not_found
);
1437 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1438 atomic_inc(&mp
->stats
.xid_not_found
);
1441 if (ep
->rxid
== FC_XID_UNKNOWN
)
1442 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1443 if (ep
->sid
!= 0 && ep
->sid
!= ntoh24(fh
->fh_d_id
)) {
1444 atomic_inc(&mp
->stats
.xid_not_found
);
1447 if (ep
->did
!= ntoh24(fh
->fh_s_id
) &&
1448 ep
->did
!= FC_FID_FLOGI
) {
1449 atomic_inc(&mp
->stats
.xid_not_found
);
1454 if (fc_sof_is_init(sof
)) {
1455 sp
->ssb_stat
|= SSB_ST_RESP
;
1456 sp
->id
= fh
->fh_seq_id
;
1457 } else if (sp
->id
!= fh
->fh_seq_id
) {
1458 atomic_inc(&mp
->stats
.seq_not_found
);
1462 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1464 if (f_ctl
& FC_FC_SEQ_INIT
)
1465 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1467 if (fc_sof_needs_ack(sof
))
1468 fc_seq_send_ack(sp
, fp
);
1470 ex_resp_arg
= ep
->arg
;
1472 if (fh
->fh_type
!= FC_TYPE_FCP
&& fr_eof(fp
) == FC_EOF_T
&&
1473 (f_ctl
& (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) ==
1474 (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) {
1475 spin_lock_bh(&ep
->ex_lock
);
1477 rc
= fc_exch_done_locked(ep
);
1478 WARN_ON(fc_seq_exch(sp
) != ep
);
1479 spin_unlock_bh(&ep
->ex_lock
);
1485 * Call the receive function.
1486 * The sequence is held (has a refcnt) for us,
1487 * but not for the receive function.
1489 * The receive function may allocate a new sequence
1490 * over the old one, so we shouldn't change the
1491 * sequence after this.
1493 * The frame will be freed by the receive function.
1494 * If new exch resp handler is valid then call that
1498 resp(sp
, fp
, ex_resp_arg
);
1501 fc_exch_release(ep
);
1504 fc_exch_release(ep
);
1510 * fc_exch_recv_resp() - Handler for a sequence where other end is
1511 * responding to our sequence
1512 * @mp: The EM that the exchange is on
1513 * @fp: The response frame
1515 static void fc_exch_recv_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1519 sp
= fc_seq_lookup_orig(mp
, fp
); /* doesn't hold sequence */
1522 atomic_inc(&mp
->stats
.xid_not_found
);
1524 atomic_inc(&mp
->stats
.non_bls_resp
);
1530 * fc_exch_abts_resp() - Handler for a response to an ABT
1531 * @ep: The exchange that the frame is on
1532 * @fp: The response frame
1534 * This response would be to an ABTS cancelling an exchange or sequence.
1535 * The response can be either BA_ACC or BA_RJT
1537 static void fc_exch_abts_resp(struct fc_exch
*ep
, struct fc_frame
*fp
)
1539 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1541 struct fc_frame_header
*fh
;
1542 struct fc_ba_acc
*ap
;
1546 int rc
= 1, has_rec
= 0;
1548 fh
= fc_frame_header_get(fp
);
1549 FC_EXCH_DBG(ep
, "exch: BLS rctl %x - %s\n", fh
->fh_r_ctl
,
1550 fc_exch_rctl_name(fh
->fh_r_ctl
));
1552 if (cancel_delayed_work_sync(&ep
->timeout_work
))
1553 fc_exch_release(ep
); /* release from pending timer hold */
1555 spin_lock_bh(&ep
->ex_lock
);
1556 switch (fh
->fh_r_ctl
) {
1557 case FC_RCTL_BA_ACC
:
1558 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1563 * Decide whether to establish a Recovery Qualifier.
1564 * We do this if there is a non-empty SEQ_CNT range and
1565 * SEQ_ID is the same as the one we aborted.
1567 low
= ntohs(ap
->ba_low_seq_cnt
);
1568 high
= ntohs(ap
->ba_high_seq_cnt
);
1569 if ((ep
->esb_stat
& ESB_ST_REC_QUAL
) == 0 &&
1570 (ap
->ba_seq_id_val
!= FC_BA_SEQ_ID_VAL
||
1571 ap
->ba_seq_id
== ep
->seq_id
) && low
!= high
) {
1572 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1573 fc_exch_hold(ep
); /* hold for recovery qualifier */
1577 case FC_RCTL_BA_RJT
:
1584 ex_resp_arg
= ep
->arg
;
1586 /* do we need to do some other checks here. Can we reuse more of
1587 * fc_exch_recv_seq_resp
1591 * do we want to check END_SEQ as well as LAST_SEQ here?
1593 if (ep
->fh_type
!= FC_TYPE_FCP
&&
1594 ntoh24(fh
->fh_f_ctl
) & FC_FC_LAST_SEQ
)
1595 rc
= fc_exch_done_locked(ep
);
1596 spin_unlock_bh(&ep
->ex_lock
);
1601 resp(sp
, fp
, ex_resp_arg
);
1606 fc_exch_timer_set(ep
, ep
->r_a_tov
);
1611 * fc_exch_recv_bls() - Handler for a BLS sequence
1612 * @mp: The EM that the exchange is on
1613 * @fp: The request frame
1615 * The BLS frame is always a sequence initiated by the remote side.
1616 * We may be either the originator or recipient of the exchange.
1618 static void fc_exch_recv_bls(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1620 struct fc_frame_header
*fh
;
1624 fh
= fc_frame_header_get(fp
);
1625 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1628 ep
= fc_exch_find(mp
, (f_ctl
& FC_FC_EX_CTX
) ?
1629 ntohs(fh
->fh_ox_id
) : ntohs(fh
->fh_rx_id
));
1630 if (ep
&& (f_ctl
& FC_FC_SEQ_INIT
)) {
1631 spin_lock_bh(&ep
->ex_lock
);
1632 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1633 spin_unlock_bh(&ep
->ex_lock
);
1635 if (f_ctl
& FC_FC_SEQ_CTX
) {
1637 * A response to a sequence we initiated.
1638 * This should only be ACKs for class 2 or F.
1640 switch (fh
->fh_r_ctl
) {
1645 FC_EXCH_DBG(ep
, "BLS rctl %x - %s received",
1647 fc_exch_rctl_name(fh
->fh_r_ctl
));
1652 switch (fh
->fh_r_ctl
) {
1653 case FC_RCTL_BA_RJT
:
1654 case FC_RCTL_BA_ACC
:
1656 fc_exch_abts_resp(ep
, fp
);
1660 case FC_RCTL_BA_ABTS
:
1661 fc_exch_recv_abts(ep
, fp
);
1663 default: /* ignore junk */
1669 fc_exch_release(ep
); /* release hold taken by fc_exch_find */
1673 * fc_seq_ls_acc() - Accept sequence with LS_ACC
1674 * @rx_fp: The received frame, not freed here.
1676 * If this fails due to allocation or transmit congestion, assume the
1677 * originator will repeat the sequence.
1679 static void fc_seq_ls_acc(struct fc_frame
*rx_fp
)
1681 struct fc_lport
*lport
;
1682 struct fc_els_ls_acc
*acc
;
1683 struct fc_frame
*fp
;
1685 lport
= fr_dev(rx_fp
);
1686 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1689 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1690 memset(acc
, 0, sizeof(*acc
));
1691 acc
->la_cmd
= ELS_LS_ACC
;
1692 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1693 lport
->tt
.frame_send(lport
, fp
);
1697 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
1698 * @rx_fp: The received frame, not freed here.
1699 * @reason: The reason the sequence is being rejected
1700 * @explan: The explanation for the rejection
1702 * If this fails due to allocation or transmit congestion, assume the
1703 * originator will repeat the sequence.
1705 static void fc_seq_ls_rjt(struct fc_frame
*rx_fp
, enum fc_els_rjt_reason reason
,
1706 enum fc_els_rjt_explan explan
)
1708 struct fc_lport
*lport
;
1709 struct fc_els_ls_rjt
*rjt
;
1710 struct fc_frame
*fp
;
1712 lport
= fr_dev(rx_fp
);
1713 fp
= fc_frame_alloc(lport
, sizeof(*rjt
));
1716 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1717 memset(rjt
, 0, sizeof(*rjt
));
1718 rjt
->er_cmd
= ELS_LS_RJT
;
1719 rjt
->er_reason
= reason
;
1720 rjt
->er_explan
= explan
;
1721 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1722 lport
->tt
.frame_send(lport
, fp
);
1726 * fc_exch_reset() - Reset an exchange
1727 * @ep: The exchange to be reset
1729 static void fc_exch_reset(struct fc_exch
*ep
)
1732 void (*resp
)(struct fc_seq
*, struct fc_frame
*, void *);
1736 spin_lock_bh(&ep
->ex_lock
);
1737 fc_exch_abort_locked(ep
, 0);
1738 ep
->state
|= FC_EX_RST_CLEANUP
;
1739 if (cancel_delayed_work(&ep
->timeout_work
))
1740 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
1743 if (ep
->esb_stat
& ESB_ST_REC_QUAL
)
1744 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec_qual */
1745 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
1748 rc
= fc_exch_done_locked(ep
);
1749 spin_unlock_bh(&ep
->ex_lock
);
1754 resp(sp
, ERR_PTR(-FC_EX_CLOSED
), arg
);
1758 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1759 * @lport: The local port that the exchange pool is on
1760 * @pool: The exchange pool to be reset
1761 * @sid: The source ID
1762 * @did: The destination ID
1764 * Resets a per cpu exches pool, releasing all of its sequences
1765 * and exchanges. If sid is non-zero then reset only exchanges
1766 * we sourced from the local port's FID. If did is non-zero then
1767 * only reset exchanges destined for the local port's FID.
1769 static void fc_exch_pool_reset(struct fc_lport
*lport
,
1770 struct fc_exch_pool
*pool
,
1774 struct fc_exch
*next
;
1776 spin_lock_bh(&pool
->lock
);
1778 list_for_each_entry_safe(ep
, next
, &pool
->ex_list
, ex_list
) {
1779 if ((lport
== ep
->lp
) &&
1780 (sid
== 0 || sid
== ep
->sid
) &&
1781 (did
== 0 || did
== ep
->did
)) {
1783 spin_unlock_bh(&pool
->lock
);
1787 fc_exch_release(ep
);
1788 spin_lock_bh(&pool
->lock
);
1791 * must restart loop incase while lock
1792 * was down multiple eps were released.
1797 spin_unlock_bh(&pool
->lock
);
1801 * fc_exch_mgr_reset() - Reset all EMs of a local port
1802 * @lport: The local port whose EMs are to be reset
1803 * @sid: The source ID
1804 * @did: The destination ID
1806 * Reset all EMs associated with a given local port. Release all
1807 * sequences and exchanges. If sid is non-zero then reset only the
1808 * exchanges sent from the local port's FID. If did is non-zero then
1809 * reset only exchanges destined for the local port's FID.
1811 void fc_exch_mgr_reset(struct fc_lport
*lport
, u32 sid
, u32 did
)
1813 struct fc_exch_mgr_anchor
*ema
;
1816 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
1817 for_each_possible_cpu(cpu
)
1818 fc_exch_pool_reset(lport
,
1819 per_cpu_ptr(ema
->mp
->pool
, cpu
),
1823 EXPORT_SYMBOL(fc_exch_mgr_reset
);
1826 * fc_exch_lookup() - find an exchange
1827 * @lport: The local port
1828 * @xid: The exchange ID
1830 * Returns exchange pointer with hold for caller, or NULL if not found.
1832 static struct fc_exch
*fc_exch_lookup(struct fc_lport
*lport
, u32 xid
)
1834 struct fc_exch_mgr_anchor
*ema
;
1836 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1837 if (ema
->mp
->min_xid
<= xid
&& xid
<= ema
->mp
->max_xid
)
1838 return fc_exch_find(ema
->mp
, xid
);
1843 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
1844 * @rfp: The REC frame, not freed here.
1846 * Note that the requesting port may be different than the S_ID in the request.
1848 static void fc_exch_els_rec(struct fc_frame
*rfp
)
1850 struct fc_lport
*lport
;
1851 struct fc_frame
*fp
;
1853 struct fc_els_rec
*rp
;
1854 struct fc_els_rec_acc
*acc
;
1855 enum fc_els_rjt_reason reason
= ELS_RJT_LOGIC
;
1856 enum fc_els_rjt_explan explan
;
1861 lport
= fr_dev(rfp
);
1862 rp
= fc_frame_payload_get(rfp
, sizeof(*rp
));
1863 explan
= ELS_EXPL_INV_LEN
;
1866 sid
= ntoh24(rp
->rec_s_id
);
1867 rxid
= ntohs(rp
->rec_rx_id
);
1868 oxid
= ntohs(rp
->rec_ox_id
);
1870 ep
= fc_exch_lookup(lport
,
1871 sid
== fc_host_port_id(lport
->host
) ? oxid
: rxid
);
1872 explan
= ELS_EXPL_OXID_RXID
;
1875 if (ep
->oid
!= sid
|| oxid
!= ep
->oxid
)
1877 if (rxid
!= FC_XID_UNKNOWN
&& rxid
!= ep
->rxid
)
1879 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1883 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1884 memset(acc
, 0, sizeof(*acc
));
1885 acc
->reca_cmd
= ELS_LS_ACC
;
1886 acc
->reca_ox_id
= rp
->rec_ox_id
;
1887 memcpy(acc
->reca_ofid
, rp
->rec_s_id
, 3);
1888 acc
->reca_rx_id
= htons(ep
->rxid
);
1889 if (ep
->sid
== ep
->oid
)
1890 hton24(acc
->reca_rfid
, ep
->did
);
1892 hton24(acc
->reca_rfid
, ep
->sid
);
1893 acc
->reca_fc4value
= htonl(ep
->seq
.rec_data
);
1894 acc
->reca_e_stat
= htonl(ep
->esb_stat
& (ESB_ST_RESP
|
1897 fc_fill_reply_hdr(fp
, rfp
, FC_RCTL_ELS_REP
, 0);
1898 lport
->tt
.frame_send(lport
, fp
);
1900 fc_exch_release(ep
);
1904 fc_exch_release(ep
);
1906 fc_seq_ls_rjt(rfp
, reason
, explan
);
1910 * fc_exch_rrq_resp() - Handler for RRQ responses
1911 * @sp: The sequence that the RRQ is on
1912 * @fp: The RRQ frame
1913 * @arg: The exchange that the RRQ is on
1915 * TODO: fix error handler.
1917 static void fc_exch_rrq_resp(struct fc_seq
*sp
, struct fc_frame
*fp
, void *arg
)
1919 struct fc_exch
*aborted_ep
= arg
;
1923 int err
= PTR_ERR(fp
);
1925 if (err
== -FC_EX_CLOSED
|| err
== -FC_EX_TIMEOUT
)
1927 FC_EXCH_DBG(aborted_ep
, "Cannot process RRQ, "
1928 "frame error %d\n", err
);
1932 op
= fc_frame_payload_op(fp
);
1937 FC_EXCH_DBG(aborted_ep
, "LS_RJT for RRQ");
1942 FC_EXCH_DBG(aborted_ep
, "unexpected response op %x "
1948 fc_exch_done(&aborted_ep
->seq
);
1949 /* drop hold for rec qual */
1950 fc_exch_release(aborted_ep
);
1955 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
1956 * @lport: The local port to send the frame on
1957 * @fp: The frame to be sent
1958 * @resp: The response handler for this request
1959 * @destructor: The destructor for the exchange
1960 * @arg: The argument to be passed to the response handler
1961 * @timer_msec: The timeout period for the exchange
1963 * The frame pointer with some of the header's fields must be
1964 * filled before calling this routine, those fields are:
1971 * - parameter or relative offset
1973 static struct fc_seq
*fc_exch_seq_send(struct fc_lport
*lport
,
1974 struct fc_frame
*fp
,
1975 void (*resp
)(struct fc_seq
*,
1976 struct fc_frame
*fp
,
1978 void (*destructor
)(struct fc_seq
*,
1980 void *arg
, u32 timer_msec
)
1983 struct fc_seq
*sp
= NULL
;
1984 struct fc_frame_header
*fh
;
1985 struct fc_fcp_pkt
*fsp
= NULL
;
1988 ep
= fc_exch_alloc(lport
, fp
);
1993 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1994 fh
= fc_frame_header_get(fp
);
1995 fc_exch_set_addr(ep
, ntoh24(fh
->fh_s_id
), ntoh24(fh
->fh_d_id
));
1997 ep
->destructor
= destructor
;
1999 ep
->r_a_tov
= FC_DEF_R_A_TOV
;
2003 ep
->fh_type
= fh
->fh_type
; /* save for possbile timeout handling */
2004 ep
->f_ctl
= ntoh24(fh
->fh_f_ctl
);
2005 fc_exch_setup_hdr(ep
, fp
, ep
->f_ctl
);
2008 if (ep
->xid
<= lport
->lro_xid
&& fh
->fh_r_ctl
== FC_RCTL_DD_UNSOL_CMD
) {
2010 fc_fcp_ddp_setup(fr_fsp(fp
), ep
->xid
);
2013 if (unlikely(lport
->tt
.frame_send(lport
, fp
)))
2017 fc_exch_timer_set_locked(ep
, timer_msec
);
2018 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not first seq */
2020 if (ep
->f_ctl
& FC_FC_SEQ_INIT
)
2021 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
2022 spin_unlock_bh(&ep
->ex_lock
);
2026 fc_fcp_ddp_done(fsp
);
2027 rc
= fc_exch_done_locked(ep
);
2028 spin_unlock_bh(&ep
->ex_lock
);
2035 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
2036 * @ep: The exchange to send the RRQ on
2038 * This tells the remote port to stop blocking the use of
2039 * the exchange and the seq_cnt range.
2041 static void fc_exch_rrq(struct fc_exch
*ep
)
2043 struct fc_lport
*lport
;
2044 struct fc_els_rrq
*rrq
;
2045 struct fc_frame
*fp
;
2050 fp
= fc_frame_alloc(lport
, sizeof(*rrq
));
2054 rrq
= fc_frame_payload_get(fp
, sizeof(*rrq
));
2055 memset(rrq
, 0, sizeof(*rrq
));
2056 rrq
->rrq_cmd
= ELS_RRQ
;
2057 hton24(rrq
->rrq_s_id
, ep
->sid
);
2058 rrq
->rrq_ox_id
= htons(ep
->oxid
);
2059 rrq
->rrq_rx_id
= htons(ep
->rxid
);
2062 if (ep
->esb_stat
& ESB_ST_RESP
)
2065 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, did
,
2066 lport
->port_id
, FC_TYPE_ELS
,
2067 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
2069 if (fc_exch_seq_send(lport
, fp
, fc_exch_rrq_resp
, NULL
, ep
,
2074 spin_lock_bh(&ep
->ex_lock
);
2075 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
)) {
2076 spin_unlock_bh(&ep
->ex_lock
);
2077 /* drop hold for rec qual */
2078 fc_exch_release(ep
);
2081 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
2082 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
2083 spin_unlock_bh(&ep
->ex_lock
);
2087 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
2088 * @fp: The RRQ frame, not freed here.
2090 static void fc_exch_els_rrq(struct fc_frame
*fp
)
2092 struct fc_lport
*lport
;
2093 struct fc_exch
*ep
= NULL
; /* request or subject exchange */
2094 struct fc_els_rrq
*rp
;
2097 enum fc_els_rjt_explan explan
;
2100 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
2101 explan
= ELS_EXPL_INV_LEN
;
2106 * lookup subject exchange.
2108 sid
= ntoh24(rp
->rrq_s_id
); /* subject source */
2109 xid
= fc_host_port_id(lport
->host
) == sid
?
2110 ntohs(rp
->rrq_ox_id
) : ntohs(rp
->rrq_rx_id
);
2111 ep
= fc_exch_lookup(lport
, xid
);
2112 explan
= ELS_EXPL_OXID_RXID
;
2115 spin_lock_bh(&ep
->ex_lock
);
2116 if (ep
->oxid
!= ntohs(rp
->rrq_ox_id
))
2118 if (ep
->rxid
!= ntohs(rp
->rrq_rx_id
) &&
2119 ep
->rxid
!= FC_XID_UNKNOWN
)
2121 explan
= ELS_EXPL_SID
;
2126 * Clear Recovery Qualifier state, and cancel timer if complete.
2128 if (ep
->esb_stat
& ESB_ST_REC_QUAL
) {
2129 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
2130 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec qual */
2132 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
2133 if (cancel_delayed_work(&ep
->timeout_work
))
2134 atomic_dec(&ep
->ex_refcnt
); /* drop timer hold */
2137 spin_unlock_bh(&ep
->ex_lock
);
2146 spin_unlock_bh(&ep
->ex_lock
);
2148 fc_seq_ls_rjt(fp
, ELS_RJT_LOGIC
, explan
);
2151 fc_exch_release(ep
); /* drop hold from fc_exch_find */
2155 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
2156 * @lport: The local port to add the exchange manager to
2157 * @mp: The exchange manager to be added to the local port
2158 * @match: The match routine that indicates when this EM should be used
2160 struct fc_exch_mgr_anchor
*fc_exch_mgr_add(struct fc_lport
*lport
,
2161 struct fc_exch_mgr
*mp
,
2162 bool (*match
)(struct fc_frame
*))
2164 struct fc_exch_mgr_anchor
*ema
;
2166 ema
= kmalloc(sizeof(*ema
), GFP_ATOMIC
);
2172 /* add EM anchor to EM anchors list */
2173 list_add_tail(&ema
->ema_list
, &lport
->ema_list
);
2174 kref_get(&mp
->kref
);
2177 EXPORT_SYMBOL(fc_exch_mgr_add
);
2180 * fc_exch_mgr_destroy() - Destroy an exchange manager
2181 * @kref: The reference to the EM to be destroyed
2183 static void fc_exch_mgr_destroy(struct kref
*kref
)
2185 struct fc_exch_mgr
*mp
= container_of(kref
, struct fc_exch_mgr
, kref
);
2187 mempool_destroy(mp
->ep_pool
);
2188 free_percpu(mp
->pool
);
2193 * fc_exch_mgr_del() - Delete an EM from a local port's list
2194 * @ema: The exchange manager anchor identifying the EM to be deleted
2196 void fc_exch_mgr_del(struct fc_exch_mgr_anchor
*ema
)
2198 /* remove EM anchor from EM anchors list */
2199 list_del(&ema
->ema_list
);
2200 kref_put(&ema
->mp
->kref
, fc_exch_mgr_destroy
);
2203 EXPORT_SYMBOL(fc_exch_mgr_del
);
2206 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2207 * @src: Source lport to clone exchange managers from
2208 * @dst: New lport that takes references to all the exchange managers
2210 int fc_exch_mgr_list_clone(struct fc_lport
*src
, struct fc_lport
*dst
)
2212 struct fc_exch_mgr_anchor
*ema
, *tmp
;
2214 list_for_each_entry(ema
, &src
->ema_list
, ema_list
) {
2215 if (!fc_exch_mgr_add(dst
, ema
->mp
, ema
->match
))
2220 list_for_each_entry_safe(ema
, tmp
, &dst
->ema_list
, ema_list
)
2221 fc_exch_mgr_del(ema
);
2224 EXPORT_SYMBOL(fc_exch_mgr_list_clone
);
2227 * fc_exch_mgr_alloc() - Allocate an exchange manager
2228 * @lport: The local port that the new EM will be associated with
2229 * @class: The default FC class for new exchanges
2230 * @min_xid: The minimum XID for exchanges from the new EM
2231 * @max_xid: The maximum XID for exchanges from the new EM
2232 * @match: The match routine for the new EM
2234 struct fc_exch_mgr
*fc_exch_mgr_alloc(struct fc_lport
*lport
,
2235 enum fc_class
class,
2236 u16 min_xid
, u16 max_xid
,
2237 bool (*match
)(struct fc_frame
*))
2239 struct fc_exch_mgr
*mp
;
2240 u16 pool_exch_range
;
2243 struct fc_exch_pool
*pool
;
2245 if (max_xid
<= min_xid
|| max_xid
== FC_XID_UNKNOWN
||
2246 (min_xid
& fc_cpu_mask
) != 0) {
2247 FC_LPORT_DBG(lport
, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
2253 * allocate memory for EM
2255 mp
= kzalloc(sizeof(struct fc_exch_mgr
), GFP_ATOMIC
);
2260 /* adjust em exch xid range for offload */
2261 mp
->min_xid
= min_xid
;
2262 mp
->max_xid
= max_xid
;
2264 mp
->ep_pool
= mempool_create_slab_pool(2, fc_em_cachep
);
2269 * Setup per cpu exch pool with entire exchange id range equally
2270 * divided across all cpus. The exch pointers array memory is
2271 * allocated for exch range per pool.
2273 pool_exch_range
= (mp
->max_xid
- mp
->min_xid
+ 1) / (fc_cpu_mask
+ 1);
2274 mp
->pool_max_index
= pool_exch_range
- 1;
2277 * Allocate and initialize per cpu exch pool
2279 pool_size
= sizeof(*pool
) + pool_exch_range
* sizeof(struct fc_exch
*);
2280 mp
->pool
= __alloc_percpu(pool_size
, __alignof__(struct fc_exch_pool
));
2283 for_each_possible_cpu(cpu
) {
2284 pool
= per_cpu_ptr(mp
->pool
, cpu
);
2285 pool
->left
= FC_XID_UNKNOWN
;
2286 pool
->right
= FC_XID_UNKNOWN
;
2287 spin_lock_init(&pool
->lock
);
2288 INIT_LIST_HEAD(&pool
->ex_list
);
2291 kref_init(&mp
->kref
);
2292 if (!fc_exch_mgr_add(lport
, mp
, match
)) {
2293 free_percpu(mp
->pool
);
2298 * Above kref_init() sets mp->kref to 1 and then
2299 * call to fc_exch_mgr_add incremented mp->kref again,
2300 * so adjust that extra increment.
2302 kref_put(&mp
->kref
, fc_exch_mgr_destroy
);
2306 mempool_destroy(mp
->ep_pool
);
2311 EXPORT_SYMBOL(fc_exch_mgr_alloc
);
2314 * fc_exch_mgr_free() - Free all exchange managers on a local port
2315 * @lport: The local port whose EMs are to be freed
2317 void fc_exch_mgr_free(struct fc_lport
*lport
)
2319 struct fc_exch_mgr_anchor
*ema
, *next
;
2321 flush_workqueue(fc_exch_workqueue
);
2322 list_for_each_entry_safe(ema
, next
, &lport
->ema_list
, ema_list
)
2323 fc_exch_mgr_del(ema
);
2325 EXPORT_SYMBOL(fc_exch_mgr_free
);
2328 * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending
2331 * @lport: The local port the frame was received on
2332 * @fh: The received frame header
2334 static struct fc_exch_mgr_anchor
*fc_find_ema(u32 f_ctl
,
2335 struct fc_lport
*lport
,
2336 struct fc_frame_header
*fh
)
2338 struct fc_exch_mgr_anchor
*ema
;
2341 if (f_ctl
& FC_FC_EX_CTX
)
2342 xid
= ntohs(fh
->fh_ox_id
);
2344 xid
= ntohs(fh
->fh_rx_id
);
2345 if (xid
== FC_XID_UNKNOWN
)
2346 return list_entry(lport
->ema_list
.prev
,
2347 typeof(*ema
), ema_list
);
2350 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
2351 if ((xid
>= ema
->mp
->min_xid
) &&
2352 (xid
<= ema
->mp
->max_xid
))
2358 * fc_exch_recv() - Handler for received frames
2359 * @lport: The local port the frame was received on
2360 * @fp: The received frame
2362 void fc_exch_recv(struct fc_lport
*lport
, struct fc_frame
*fp
)
2364 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
2365 struct fc_exch_mgr_anchor
*ema
;
2369 if (!lport
|| lport
->state
== LPORT_ST_DISABLED
) {
2370 FC_LPORT_DBG(lport
, "Receiving frames for an lport that "
2371 "has not been initialized correctly\n");
2376 f_ctl
= ntoh24(fh
->fh_f_ctl
);
2377 ema
= fc_find_ema(f_ctl
, lport
, fh
);
2379 FC_LPORT_DBG(lport
, "Unable to find Exchange Manager Anchor,"
2380 "fc_ctl <0x%x>, xid <0x%x>\n",
2382 (f_ctl
& FC_FC_EX_CTX
) ?
2383 ntohs(fh
->fh_ox_id
) :
2384 ntohs(fh
->fh_rx_id
));
2390 * If frame is marked invalid, just drop it.
2392 switch (fr_eof(fp
)) {
2394 if (f_ctl
& FC_FC_END_SEQ
)
2395 skb_trim(fp_skb(fp
), fr_len(fp
) - FC_FC_FILL(f_ctl
));
2398 if (fh
->fh_type
== FC_TYPE_BLS
)
2399 fc_exch_recv_bls(ema
->mp
, fp
);
2400 else if ((f_ctl
& (FC_FC_EX_CTX
| FC_FC_SEQ_CTX
)) ==
2402 fc_exch_recv_seq_resp(ema
->mp
, fp
);
2403 else if (f_ctl
& FC_FC_SEQ_CTX
)
2404 fc_exch_recv_resp(ema
->mp
, fp
);
2405 else /* no EX_CTX and no SEQ_CTX */
2406 fc_exch_recv_req(lport
, ema
->mp
, fp
);
2409 FC_LPORT_DBG(lport
, "dropping invalid frame (eof %x)",
2414 EXPORT_SYMBOL(fc_exch_recv
);
2417 * fc_exch_init() - Initialize the exchange layer for a local port
2418 * @lport: The local port to initialize the exchange layer for
2420 int fc_exch_init(struct fc_lport
*lport
)
2422 if (!lport
->tt
.seq_start_next
)
2423 lport
->tt
.seq_start_next
= fc_seq_start_next
;
2425 if (!lport
->tt
.seq_set_resp
)
2426 lport
->tt
.seq_set_resp
= fc_seq_set_resp
;
2428 if (!lport
->tt
.exch_seq_send
)
2429 lport
->tt
.exch_seq_send
= fc_exch_seq_send
;
2431 if (!lport
->tt
.seq_send
)
2432 lport
->tt
.seq_send
= fc_seq_send
;
2434 if (!lport
->tt
.seq_els_rsp_send
)
2435 lport
->tt
.seq_els_rsp_send
= fc_seq_els_rsp_send
;
2437 if (!lport
->tt
.exch_done
)
2438 lport
->tt
.exch_done
= fc_exch_done
;
2440 if (!lport
->tt
.exch_mgr_reset
)
2441 lport
->tt
.exch_mgr_reset
= fc_exch_mgr_reset
;
2443 if (!lport
->tt
.seq_exch_abort
)
2444 lport
->tt
.seq_exch_abort
= fc_seq_exch_abort
;
2446 if (!lport
->tt
.seq_assign
)
2447 lport
->tt
.seq_assign
= fc_seq_assign
;
2449 if (!lport
->tt
.seq_release
)
2450 lport
->tt
.seq_release
= fc_seq_release
;
2454 EXPORT_SYMBOL(fc_exch_init
);
2457 * fc_setup_exch_mgr() - Setup an exchange manager
2459 int fc_setup_exch_mgr(void)
2461 fc_em_cachep
= kmem_cache_create("libfc_em", sizeof(struct fc_exch
),
2462 0, SLAB_HWCACHE_ALIGN
, NULL
);
2467 * Initialize fc_cpu_mask and fc_cpu_order. The
2468 * fc_cpu_mask is set for nr_cpu_ids rounded up
2469 * to order of 2's * power and order is stored
2470 * in fc_cpu_order as this is later required in
2471 * mapping between an exch id and exch array index
2472 * in per cpu exch pool.
2474 * This round up is required to align fc_cpu_mask
2475 * to exchange id's lower bits such that all incoming
2476 * frames of an exchange gets delivered to the same
2477 * cpu on which exchange originated by simple bitwise
2478 * AND operation between fc_cpu_mask and exchange id.
2482 while (fc_cpu_mask
< nr_cpu_ids
) {
2488 fc_exch_workqueue
= create_singlethread_workqueue("fc_exch_workqueue");
2489 if (!fc_exch_workqueue
)
2493 kmem_cache_destroy(fc_em_cachep
);
2498 * fc_destroy_exch_mgr() - Destroy an exchange manager
2500 void fc_destroy_exch_mgr(void)
2502 destroy_workqueue(fc_exch_workqueue
);
2503 kmem_cache_destroy(fc_em_cachep
);