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 static 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.
69 struct list_head ex_list
;
73 /* two cache of free slot in exch array */
76 } ____cacheline_aligned_in_smp
;
79 * struct fc_exch_mgr - The Exchange Manager (EM).
80 * @class: Default class for new sequences
81 * @kref: Reference counter
82 * @min_xid: Minimum exchange ID
83 * @max_xid: Maximum exchange ID
84 * @ep_pool: Reserved exchange pointers
85 * @pool_max_index: Max exch array index in exch pool
86 * @pool: Per cpu exch pool
87 * @stats: Statistics structure
89 * This structure is the center for creating exchanges and sequences.
90 * It manages the allocation of exchange IDs.
93 struct fc_exch_pool
*pool
;
102 * currently exchange mgr stats are updated but not used.
103 * either stats can be expose via sysfs or remove them
104 * all together if not used XXX
107 atomic_t no_free_exch
;
108 atomic_t no_free_exch_xid
;
109 atomic_t xid_not_found
;
111 atomic_t seq_not_found
;
112 atomic_t non_bls_resp
;
117 * struct fc_exch_mgr_anchor - primary structure for list of EMs
118 * @ema_list: Exchange Manager Anchor list
119 * @mp: Exchange Manager associated with this anchor
120 * @match: Routine to determine if this anchor's EM should be used
122 * When walking the list of anchors the match routine will be called
123 * for each anchor to determine if that EM should be used. The last
124 * anchor in the list will always match to handle any exchanges not
125 * handled by other EMs. The non-default EMs would be added to the
126 * anchor list by HW that provides FCoE offloads.
128 struct fc_exch_mgr_anchor
{
129 struct list_head ema_list
;
130 struct fc_exch_mgr
*mp
;
131 bool (*match
)(struct fc_frame
*);
134 static void fc_exch_rrq(struct fc_exch
*);
135 static void fc_seq_ls_acc(struct fc_frame
*);
136 static void fc_seq_ls_rjt(struct fc_frame
*, enum fc_els_rjt_reason
,
137 enum fc_els_rjt_explan
);
138 static void fc_exch_els_rec(struct fc_frame
*);
139 static void fc_exch_els_rrq(struct fc_frame
*);
142 * Internal implementation notes.
144 * The exchange manager is one by default in libfc but LLD may choose
145 * to have one per CPU. The sequence manager is one per exchange manager
146 * and currently never separated.
148 * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
149 * assigned by the Sequence Initiator that shall be unique for a specific
150 * D_ID and S_ID pair while the Sequence is open." Note that it isn't
151 * qualified by exchange ID, which one might think it would be.
152 * In practice this limits the number of open sequences and exchanges to 256
153 * per session. For most targets we could treat this limit as per exchange.
155 * The exchange and its sequence are freed when the last sequence is received.
156 * It's possible for the remote port to leave an exchange open without
157 * sending any sequences.
159 * Notes on reference counts:
161 * Exchanges are reference counted and exchange gets freed when the reference
162 * count becomes zero.
165 * Sequences are timed out for E_D_TOV and R_A_TOV.
167 * Sequence event handling:
169 * The following events may occur on initiator sequences:
172 * For now, the whole thing is sent.
174 * This applies only to class F.
175 * The sequence is marked complete.
177 * The upper layer calls fc_exch_done() when done
178 * with exchange and sequence tuple.
179 * RX-inferred completion.
180 * When we receive the next sequence on the same exchange, we can
181 * retire the previous sequence ID. (XXX not implemented).
183 * R_A_TOV frees the sequence ID. If we're waiting for ACK,
184 * E_D_TOV causes abort and calls upper layer response handler
185 * with FC_EX_TIMEOUT error.
191 * The following events may occur on recipient sequences:
194 * Allocate sequence for first frame received.
195 * Hold during receive handler.
196 * Release when final frame received.
197 * Keep status of last N of these for the ELS RES command. XXX TBD.
199 * Deallocate sequence
203 * For now, we neglect conditions where only part of a sequence was
204 * received or transmitted, or where out-of-order receipt is detected.
210 * The EM code run in a per-CPU worker thread.
212 * To protect against concurrency between a worker thread code and timers,
213 * sequence allocation and deallocation must be locked.
214 * - exchange refcnt can be done atomicly without locks.
215 * - sequence allocation must be locked by exch lock.
216 * - If the EM pool lock and ex_lock must be taken at the same time, then the
217 * EM pool lock must be taken before the ex_lock.
221 * opcode names for debugging.
223 static char *fc_exch_rctl_names
[] = FC_RCTL_NAMES_INIT
;
226 * fc_exch_name_lookup() - Lookup name by opcode
227 * @op: Opcode to be looked up
228 * @table: Opcode/name table
229 * @max_index: Index not to be exceeded
231 * This routine is used to determine a human-readable string identifying
234 static inline const char *fc_exch_name_lookup(unsigned int op
, char **table
,
235 unsigned int max_index
)
237 const char *name
= NULL
;
247 * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
248 * @op: The opcode to be looked up
250 static const char *fc_exch_rctl_name(unsigned int op
)
252 return fc_exch_name_lookup(op
, fc_exch_rctl_names
,
253 ARRAY_SIZE(fc_exch_rctl_names
));
257 * fc_exch_hold() - Increment an exchange's reference count
258 * @ep: Echange to be held
260 static inline void fc_exch_hold(struct fc_exch
*ep
)
262 atomic_inc(&ep
->ex_refcnt
);
266 * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
267 * and determine SOF and EOF.
268 * @ep: The exchange to that will use the header
269 * @fp: The frame whose header is to be modified
270 * @f_ctl: F_CTL bits that will be used for the frame header
272 * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
273 * fh_seq_id, fh_seq_cnt and the SOF and EOF.
275 static void fc_exch_setup_hdr(struct fc_exch
*ep
, struct fc_frame
*fp
,
278 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
281 fr_sof(fp
) = ep
->class;
283 fr_sof(fp
) = fc_sof_normal(ep
->class);
285 if (f_ctl
& FC_FC_END_SEQ
) {
286 fr_eof(fp
) = FC_EOF_T
;
287 if (fc_sof_needs_ack(ep
->class))
288 fr_eof(fp
) = FC_EOF_N
;
291 * The number of fill bytes to make the length a 4-byte
292 * multiple is the low order 2-bits of the f_ctl.
293 * The fill itself will have been cleared by the frame
295 * After this, the length will be even, as expected by
298 fill
= fr_len(fp
) & 3;
301 /* TODO, this may be a problem with fragmented skb */
302 skb_put(fp_skb(fp
), fill
);
303 hton24(fh
->fh_f_ctl
, f_ctl
| fill
);
306 WARN_ON(fr_len(fp
) % 4 != 0); /* no pad to non last frame */
307 fr_eof(fp
) = FC_EOF_N
;
311 * Initialize remainig fh fields
312 * from fc_fill_fc_hdr
314 fh
->fh_ox_id
= htons(ep
->oxid
);
315 fh
->fh_rx_id
= htons(ep
->rxid
);
316 fh
->fh_seq_id
= ep
->seq
.id
;
317 fh
->fh_seq_cnt
= htons(ep
->seq
.cnt
);
321 * fc_exch_release() - Decrement an exchange's reference count
322 * @ep: Exchange to be released
324 * If the reference count reaches zero and the exchange is complete,
327 static void fc_exch_release(struct fc_exch
*ep
)
329 struct fc_exch_mgr
*mp
;
331 if (atomic_dec_and_test(&ep
->ex_refcnt
)) {
334 ep
->destructor(&ep
->seq
, ep
->arg
);
335 WARN_ON(!(ep
->esb_stat
& ESB_ST_COMPLETE
));
336 mempool_free(ep
, mp
->ep_pool
);
341 * fc_exch_done_locked() - Complete an exchange with the exchange lock held
342 * @ep: The exchange that is complete
344 static int fc_exch_done_locked(struct fc_exch
*ep
)
349 * We must check for completion in case there are two threads
350 * tyring to complete this. But the rrq code will reuse the
351 * ep, and in that case we only clear the resp and set it as
352 * complete, so it can be reused by the timer to send the rrq.
355 if (ep
->state
& FC_EX_DONE
)
357 ep
->esb_stat
|= ESB_ST_COMPLETE
;
359 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
)) {
360 ep
->state
|= FC_EX_DONE
;
361 if (cancel_delayed_work(&ep
->timeout_work
))
362 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
369 * fc_exch_ptr_get() - Return an exchange from an exchange pool
370 * @pool: Exchange Pool to get an exchange from
371 * @index: Index of the exchange within the pool
373 * Use the index to get an exchange from within an exchange pool. exches
374 * will point to an array of exchange pointers. The index will select
375 * the exchange within the array.
377 static inline struct fc_exch
*fc_exch_ptr_get(struct fc_exch_pool
*pool
,
380 struct fc_exch
**exches
= (struct fc_exch
**)(pool
+ 1);
381 return exches
[index
];
385 * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
386 * @pool: The pool to assign the exchange to
387 * @index: The index in the pool where the exchange will be assigned
388 * @ep: The exchange to assign to the pool
390 static inline void fc_exch_ptr_set(struct fc_exch_pool
*pool
, u16 index
,
393 ((struct fc_exch
**)(pool
+ 1))[index
] = ep
;
397 * fc_exch_delete() - Delete an exchange
398 * @ep: The exchange to be deleted
400 static void fc_exch_delete(struct fc_exch
*ep
)
402 struct fc_exch_pool
*pool
;
406 spin_lock_bh(&pool
->lock
);
407 WARN_ON(pool
->total_exches
<= 0);
408 pool
->total_exches
--;
410 /* update cache of free slot */
411 index
= (ep
->xid
- ep
->em
->min_xid
) >> fc_cpu_order
;
412 if (pool
->left
== FC_XID_UNKNOWN
)
414 else if (pool
->right
== FC_XID_UNKNOWN
)
417 pool
->next_index
= index
;
419 fc_exch_ptr_set(pool
, index
, NULL
);
420 list_del(&ep
->ex_list
);
421 spin_unlock_bh(&pool
->lock
);
422 fc_exch_release(ep
); /* drop hold for exch in mp */
426 * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
427 * the exchange lock held
428 * @ep: The exchange whose timer will start
429 * @timer_msec: The timeout period
431 * Used for upper level protocols to time out the exchange.
432 * The timer is cancelled when it fires or when the exchange completes.
434 static inline void fc_exch_timer_set_locked(struct fc_exch
*ep
,
435 unsigned int timer_msec
)
437 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
440 FC_EXCH_DBG(ep
, "Exchange timer armed\n");
442 if (queue_delayed_work(fc_exch_workqueue
, &ep
->timeout_work
,
443 msecs_to_jiffies(timer_msec
)))
444 fc_exch_hold(ep
); /* hold for timer */
448 * fc_exch_timer_set() - Lock the exchange and set the timer
449 * @ep: The exchange whose timer will start
450 * @timer_msec: The timeout period
452 static void fc_exch_timer_set(struct fc_exch
*ep
, unsigned int timer_msec
)
454 spin_lock_bh(&ep
->ex_lock
);
455 fc_exch_timer_set_locked(ep
, timer_msec
);
456 spin_unlock_bh(&ep
->ex_lock
);
460 * fc_seq_send() - Send a frame using existing sequence/exchange pair
461 * @lport: The local port that the exchange will be sent on
462 * @sp: The sequence to be sent
463 * @fp: The frame to be sent on the exchange
465 static int fc_seq_send(struct fc_lport
*lport
, struct fc_seq
*sp
,
469 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
473 ep
= fc_seq_exch(sp
);
474 WARN_ON((ep
->esb_stat
& ESB_ST_SEQ_INIT
) != ESB_ST_SEQ_INIT
);
476 f_ctl
= ntoh24(fh
->fh_f_ctl
);
477 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
478 fr_encaps(fp
) = ep
->encaps
;
481 * update sequence count if this frame is carrying
482 * multiple FC frames when sequence offload is enabled
485 if (fr_max_payload(fp
))
486 sp
->cnt
+= DIV_ROUND_UP((fr_len(fp
) - sizeof(*fh
)),
494 error
= lport
->tt
.frame_send(lport
, fp
);
497 * Update the exchange and sequence flags,
498 * assuming all frames for the sequence have been sent.
499 * We can only be called to send once for each sequence.
501 spin_lock_bh(&ep
->ex_lock
);
502 ep
->f_ctl
= f_ctl
& ~FC_FC_FIRST_SEQ
; /* not first seq */
503 if (f_ctl
& FC_FC_SEQ_INIT
)
504 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
505 spin_unlock_bh(&ep
->ex_lock
);
510 * fc_seq_alloc() - Allocate a sequence for a given exchange
511 * @ep: The exchange to allocate a new sequence for
512 * @seq_id: The sequence ID to be used
514 * We don't support multiple originated sequences on the same exchange.
515 * By implication, any previously originated sequence on this exchange
516 * is complete, and we reallocate the same sequence.
518 static struct fc_seq
*fc_seq_alloc(struct fc_exch
*ep
, u8 seq_id
)
530 * fc_seq_start_next_locked() - Allocate a new sequence on the same
531 * exchange as the supplied sequence
532 * @sp: The sequence/exchange to get a new sequence for
534 static struct fc_seq
*fc_seq_start_next_locked(struct fc_seq
*sp
)
536 struct fc_exch
*ep
= fc_seq_exch(sp
);
538 sp
= fc_seq_alloc(ep
, ep
->seq_id
++);
539 FC_EXCH_DBG(ep
, "f_ctl %6x seq %2x\n",
545 * fc_seq_start_next() - Lock the exchange and get a new sequence
546 * for a given sequence/exchange pair
547 * @sp: The sequence/exchange to get a new exchange for
549 static struct fc_seq
*fc_seq_start_next(struct fc_seq
*sp
)
551 struct fc_exch
*ep
= fc_seq_exch(sp
);
553 spin_lock_bh(&ep
->ex_lock
);
554 sp
= fc_seq_start_next_locked(sp
);
555 spin_unlock_bh(&ep
->ex_lock
);
561 * Set the response handler for the exchange associated with a sequence.
563 static void fc_seq_set_resp(struct fc_seq
*sp
,
564 void (*resp
)(struct fc_seq
*, struct fc_frame
*,
568 struct fc_exch
*ep
= fc_seq_exch(sp
);
570 spin_lock_bh(&ep
->ex_lock
);
573 spin_unlock_bh(&ep
->ex_lock
);
577 * fc_seq_exch_abort() - Abort an exchange and sequence
578 * @req_sp: The sequence to be aborted
579 * @timer_msec: The period of time to wait before aborting
581 * Generally called because of a timeout or an abort from the upper layer.
583 static int fc_seq_exch_abort(const struct fc_seq
*req_sp
,
584 unsigned int timer_msec
)
591 ep
= fc_seq_exch(req_sp
);
593 spin_lock_bh(&ep
->ex_lock
);
594 if (ep
->esb_stat
& (ESB_ST_COMPLETE
| ESB_ST_ABNORMAL
) ||
595 ep
->state
& (FC_EX_DONE
| FC_EX_RST_CLEANUP
)) {
596 spin_unlock_bh(&ep
->ex_lock
);
601 * Send the abort on a new sequence if possible.
603 sp
= fc_seq_start_next_locked(&ep
->seq
);
605 spin_unlock_bh(&ep
->ex_lock
);
609 ep
->esb_stat
|= ESB_ST_SEQ_INIT
| ESB_ST_ABNORMAL
;
611 fc_exch_timer_set_locked(ep
, timer_msec
);
612 spin_unlock_bh(&ep
->ex_lock
);
615 * If not logged into the fabric, don't send ABTS but leave
616 * sequence active until next timeout.
622 * Send an abort for the sequence that timed out.
624 fp
= fc_frame_alloc(ep
->lp
, 0);
626 fc_fill_fc_hdr(fp
, FC_RCTL_BA_ABTS
, ep
->did
, ep
->sid
,
627 FC_TYPE_BLS
, FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
628 error
= fc_seq_send(ep
->lp
, sp
, fp
);
635 * fc_exch_timeout() - Handle exchange timer expiration
636 * @work: The work_struct identifying the exchange that timed out
638 static void fc_exch_timeout(struct work_struct
*work
)
640 struct fc_exch
*ep
= container_of(work
, struct fc_exch
,
642 struct fc_seq
*sp
= &ep
->seq
;
643 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
648 FC_EXCH_DBG(ep
, "Exchange timed out\n");
650 spin_lock_bh(&ep
->ex_lock
);
651 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
654 e_stat
= ep
->esb_stat
;
655 if (e_stat
& ESB_ST_COMPLETE
) {
656 ep
->esb_stat
= e_stat
& ~ESB_ST_REC_QUAL
;
657 spin_unlock_bh(&ep
->ex_lock
);
658 if (e_stat
& ESB_ST_REC_QUAL
)
665 if (e_stat
& ESB_ST_ABNORMAL
)
666 rc
= fc_exch_done_locked(ep
);
667 spin_unlock_bh(&ep
->ex_lock
);
671 resp(sp
, ERR_PTR(-FC_EX_TIMEOUT
), arg
);
672 fc_seq_exch_abort(sp
, 2 * ep
->r_a_tov
);
676 spin_unlock_bh(&ep
->ex_lock
);
679 * This release matches the hold taken when the timer was set.
685 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
686 * @lport: The local port that the exchange is for
687 * @mp: The exchange manager that will allocate the exchange
689 * Returns pointer to allocated fc_exch with exch lock held.
691 static struct fc_exch
*fc_exch_em_alloc(struct fc_lport
*lport
,
692 struct fc_exch_mgr
*mp
)
697 struct fc_exch_pool
*pool
;
699 /* allocate memory for exchange */
700 ep
= mempool_alloc(mp
->ep_pool
, GFP_ATOMIC
);
702 atomic_inc(&mp
->stats
.no_free_exch
);
705 memset(ep
, 0, sizeof(*ep
));
708 pool
= per_cpu_ptr(mp
->pool
, cpu
);
709 spin_lock_bh(&pool
->lock
);
712 /* peek cache of free slot */
713 if (pool
->left
!= FC_XID_UNKNOWN
) {
715 pool
->left
= FC_XID_UNKNOWN
;
718 if (pool
->right
!= FC_XID_UNKNOWN
) {
720 pool
->right
= FC_XID_UNKNOWN
;
724 index
= pool
->next_index
;
725 /* allocate new exch from pool */
726 while (fc_exch_ptr_get(pool
, index
)) {
727 index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
728 if (index
== pool
->next_index
)
731 pool
->next_index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
733 fc_exch_hold(ep
); /* hold for exch in mp */
734 spin_lock_init(&ep
->ex_lock
);
736 * Hold exch lock for caller to prevent fc_exch_reset()
737 * from releasing exch while fc_exch_alloc() caller is
738 * still working on exch.
740 spin_lock_bh(&ep
->ex_lock
);
742 fc_exch_ptr_set(pool
, index
, ep
);
743 list_add_tail(&ep
->ex_list
, &pool
->ex_list
);
744 fc_seq_alloc(ep
, ep
->seq_id
++);
745 pool
->total_exches
++;
746 spin_unlock_bh(&pool
->lock
);
751 ep
->oxid
= ep
->xid
= (index
<< fc_cpu_order
| cpu
) + mp
->min_xid
;
755 ep
->f_ctl
= FC_FC_FIRST_SEQ
; /* next seq is first seq */
756 ep
->rxid
= FC_XID_UNKNOWN
;
757 ep
->class = mp
->class;
758 INIT_DELAYED_WORK(&ep
->timeout_work
, fc_exch_timeout
);
762 spin_unlock_bh(&pool
->lock
);
763 atomic_inc(&mp
->stats
.no_free_exch_xid
);
764 mempool_free(ep
, mp
->ep_pool
);
769 * fc_exch_alloc() - Allocate an exchange from an EM on a
770 * local port's list of EMs.
771 * @lport: The local port that will own the exchange
772 * @fp: The FC frame that the exchange will be for
774 * This function walks the list of exchange manager(EM)
775 * anchors to select an EM for a new exchange allocation. The
776 * EM is selected when a NULL match function pointer is encountered
777 * or when a call to a match function returns true.
779 static inline struct fc_exch
*fc_exch_alloc(struct fc_lport
*lport
,
782 struct fc_exch_mgr_anchor
*ema
;
784 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
785 if (!ema
->match
|| ema
->match(fp
))
786 return fc_exch_em_alloc(lport
, ema
->mp
);
791 * fc_exch_find() - Lookup and hold an exchange
792 * @mp: The exchange manager to lookup the exchange from
793 * @xid: The XID of the exchange to look up
795 static struct fc_exch
*fc_exch_find(struct fc_exch_mgr
*mp
, u16 xid
)
797 struct fc_exch_pool
*pool
;
798 struct fc_exch
*ep
= NULL
;
800 if ((xid
>= mp
->min_xid
) && (xid
<= mp
->max_xid
)) {
801 pool
= per_cpu_ptr(mp
->pool
, xid
& fc_cpu_mask
);
802 spin_lock_bh(&pool
->lock
);
803 ep
= fc_exch_ptr_get(pool
, (xid
- mp
->min_xid
) >> fc_cpu_order
);
804 if (ep
&& ep
->xid
== xid
)
806 spin_unlock_bh(&pool
->lock
);
813 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
814 * the memory allocated for the related objects may be freed.
815 * @sp: The sequence that has completed
817 static void fc_exch_done(struct fc_seq
*sp
)
819 struct fc_exch
*ep
= fc_seq_exch(sp
);
822 spin_lock_bh(&ep
->ex_lock
);
823 rc
= fc_exch_done_locked(ep
);
824 spin_unlock_bh(&ep
->ex_lock
);
830 * fc_exch_resp() - Allocate a new exchange for a response frame
831 * @lport: The local port that the exchange was for
832 * @mp: The exchange manager to allocate the exchange from
833 * @fp: The response frame
835 * Sets the responder ID in the frame header.
837 static struct fc_exch
*fc_exch_resp(struct fc_lport
*lport
,
838 struct fc_exch_mgr
*mp
,
842 struct fc_frame_header
*fh
;
844 ep
= fc_exch_alloc(lport
, fp
);
846 ep
->class = fc_frame_class(fp
);
849 * Set EX_CTX indicating we're responding on this exchange.
851 ep
->f_ctl
|= FC_FC_EX_CTX
; /* we're responding */
852 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not new */
853 fh
= fc_frame_header_get(fp
);
854 ep
->sid
= ntoh24(fh
->fh_d_id
);
855 ep
->did
= ntoh24(fh
->fh_s_id
);
859 * Allocated exchange has placed the XID in the
860 * originator field. Move it to the responder field,
861 * and set the originator XID from the frame.
864 ep
->oxid
= ntohs(fh
->fh_ox_id
);
865 ep
->esb_stat
|= ESB_ST_RESP
| ESB_ST_SEQ_INIT
;
866 if ((ntoh24(fh
->fh_f_ctl
) & FC_FC_SEQ_INIT
) == 0)
867 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
869 fc_exch_hold(ep
); /* hold for caller */
870 spin_unlock_bh(&ep
->ex_lock
); /* lock from fc_exch_alloc */
876 * fc_seq_lookup_recip() - Find a sequence where the other end
877 * originated the sequence
878 * @lport: The local port that the frame was sent to
879 * @mp: The Exchange Manager to lookup the exchange from
880 * @fp: The frame associated with the sequence we're looking for
882 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
883 * on the ep that should be released by the caller.
885 static enum fc_pf_rjt_reason
fc_seq_lookup_recip(struct fc_lport
*lport
,
886 struct fc_exch_mgr
*mp
,
889 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
890 struct fc_exch
*ep
= NULL
;
891 struct fc_seq
*sp
= NULL
;
892 enum fc_pf_rjt_reason reject
= FC_RJT_NONE
;
896 f_ctl
= ntoh24(fh
->fh_f_ctl
);
897 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != 0);
900 * Lookup or create the exchange if we will be creating the sequence.
902 if (f_ctl
& FC_FC_EX_CTX
) {
903 xid
= ntohs(fh
->fh_ox_id
); /* we originated exch */
904 ep
= fc_exch_find(mp
, xid
);
906 atomic_inc(&mp
->stats
.xid_not_found
);
907 reject
= FC_RJT_OX_ID
;
910 if (ep
->rxid
== FC_XID_UNKNOWN
)
911 ep
->rxid
= ntohs(fh
->fh_rx_id
);
912 else if (ep
->rxid
!= ntohs(fh
->fh_rx_id
)) {
913 reject
= FC_RJT_OX_ID
;
917 xid
= ntohs(fh
->fh_rx_id
); /* we are the responder */
920 * Special case for MDS issuing an ELS TEST with a
922 * XXX take this out once we do the proper reject.
924 if (xid
== 0 && fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
&&
925 fc_frame_payload_op(fp
) == ELS_TEST
) {
926 fh
->fh_rx_id
= htons(FC_XID_UNKNOWN
);
927 xid
= FC_XID_UNKNOWN
;
931 * new sequence - find the exchange
933 ep
= fc_exch_find(mp
, xid
);
934 if ((f_ctl
& FC_FC_FIRST_SEQ
) && fc_sof_is_init(fr_sof(fp
))) {
936 atomic_inc(&mp
->stats
.xid_busy
);
937 reject
= FC_RJT_RX_ID
;
940 ep
= fc_exch_resp(lport
, mp
, fp
);
942 reject
= FC_RJT_EXCH_EST
; /* XXX */
945 xid
= ep
->xid
; /* get our XID */
947 atomic_inc(&mp
->stats
.xid_not_found
);
948 reject
= FC_RJT_RX_ID
; /* XID not found */
954 * At this point, we have the exchange held.
955 * Find or create the sequence.
957 if (fc_sof_is_init(fr_sof(fp
))) {
959 sp
->ssb_stat
|= SSB_ST_RESP
;
960 sp
->id
= fh
->fh_seq_id
;
963 if (sp
->id
!= fh
->fh_seq_id
) {
964 atomic_inc(&mp
->stats
.seq_not_found
);
965 if (f_ctl
& FC_FC_END_SEQ
) {
967 * Update sequence_id based on incoming last
968 * frame of sequence exchange. This is needed
969 * for FCoE target where DDP has been used
970 * on target where, stack is indicated only
971 * about last frame's (payload _header) header.
972 * Whereas "seq_id" which is part of
973 * frame_header is allocated by initiator
974 * which is totally different from "seq_id"
975 * allocated when XFER_RDY was sent by target.
976 * To avoid false -ve which results into not
977 * sending RSP, hence write request on other
978 * end never finishes.
980 spin_lock_bh(&ep
->ex_lock
);
981 sp
->ssb_stat
|= SSB_ST_RESP
;
982 sp
->id
= fh
->fh_seq_id
;
983 spin_unlock_bh(&ep
->ex_lock
);
985 /* sequence/exch should exist */
986 reject
= FC_RJT_SEQ_ID
;
991 WARN_ON(ep
!= fc_seq_exch(sp
));
993 if (f_ctl
& FC_FC_SEQ_INIT
)
994 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1000 fc_exch_done(&ep
->seq
);
1001 fc_exch_release(ep
); /* hold from fc_exch_find/fc_exch_resp */
1006 * fc_seq_lookup_orig() - Find a sequence where this end
1007 * originated the sequence
1008 * @mp: The Exchange Manager to lookup the exchange from
1009 * @fp: The frame associated with the sequence we're looking for
1011 * Does not hold the sequence for the caller.
1013 static struct fc_seq
*fc_seq_lookup_orig(struct fc_exch_mgr
*mp
,
1014 struct fc_frame
*fp
)
1016 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1018 struct fc_seq
*sp
= NULL
;
1022 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1023 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != FC_FC_SEQ_CTX
);
1024 xid
= ntohs((f_ctl
& FC_FC_EX_CTX
) ? fh
->fh_ox_id
: fh
->fh_rx_id
);
1025 ep
= fc_exch_find(mp
, xid
);
1028 if (ep
->seq
.id
== fh
->fh_seq_id
) {
1030 * Save the RX_ID if we didn't previously know it.
1033 if ((f_ctl
& FC_FC_EX_CTX
) != 0 &&
1034 ep
->rxid
== FC_XID_UNKNOWN
) {
1035 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1038 fc_exch_release(ep
);
1043 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
1044 * @ep: The exchange to set the addresses for
1045 * @orig_id: The originator's ID
1046 * @resp_id: The responder's ID
1048 * Note this must be done before the first sequence of the exchange is sent.
1050 static void fc_exch_set_addr(struct fc_exch
*ep
,
1051 u32 orig_id
, u32 resp_id
)
1054 if (ep
->esb_stat
& ESB_ST_RESP
) {
1064 * fc_seq_els_rsp_send() - Send an ELS response using information from
1065 * the existing sequence/exchange.
1066 * @fp: The received frame
1067 * @els_cmd: The ELS command to be sent
1068 * @els_data: The ELS data to be sent
1070 * The received frame is not freed.
1072 static void fc_seq_els_rsp_send(struct fc_frame
*fp
, enum fc_els_cmd els_cmd
,
1073 struct fc_seq_els_data
*els_data
)
1077 fc_seq_ls_rjt(fp
, els_data
->reason
, els_data
->explan
);
1083 fc_exch_els_rrq(fp
);
1086 fc_exch_els_rec(fp
);
1089 FC_LPORT_DBG(fr_dev(fp
), "Invalid ELS CMD:%x\n", els_cmd
);
1094 * fc_seq_send_last() - Send a sequence that is the last in the exchange
1095 * @sp: The sequence that is to be sent
1096 * @fp: The frame that will be sent on the sequence
1097 * @rctl: The R_CTL information to be sent
1098 * @fh_type: The frame header type
1100 static void fc_seq_send_last(struct fc_seq
*sp
, struct fc_frame
*fp
,
1101 enum fc_rctl rctl
, enum fc_fh_type fh_type
)
1104 struct fc_exch
*ep
= fc_seq_exch(sp
);
1106 f_ctl
= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
;
1108 fc_fill_fc_hdr(fp
, rctl
, ep
->did
, ep
->sid
, fh_type
, f_ctl
, 0);
1109 fc_seq_send(ep
->lp
, sp
, fp
);
1113 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
1114 * @sp: The sequence to send the ACK on
1115 * @rx_fp: The received frame that is being acknoledged
1117 * Send ACK_1 (or equiv.) indicating we received something.
1119 static void fc_seq_send_ack(struct fc_seq
*sp
, const struct fc_frame
*rx_fp
)
1121 struct fc_frame
*fp
;
1122 struct fc_frame_header
*rx_fh
;
1123 struct fc_frame_header
*fh
;
1124 struct fc_exch
*ep
= fc_seq_exch(sp
);
1125 struct fc_lport
*lport
= ep
->lp
;
1129 * Don't send ACKs for class 3.
1131 if (fc_sof_needs_ack(fr_sof(rx_fp
))) {
1132 fp
= fc_frame_alloc(lport
, 0);
1136 fh
= fc_frame_header_get(fp
);
1137 fh
->fh_r_ctl
= FC_RCTL_ACK_1
;
1138 fh
->fh_type
= FC_TYPE_BLS
;
1141 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1142 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1143 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1144 * Last ACK uses bits 7-6 (continue sequence),
1145 * bits 5-4 are meaningful (what kind of ACK to use).
1147 rx_fh
= fc_frame_header_get(rx_fp
);
1148 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1149 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1150 FC_FC_FIRST_SEQ
| FC_FC_LAST_SEQ
|
1151 FC_FC_END_SEQ
| FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1152 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1153 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1154 hton24(fh
->fh_f_ctl
, f_ctl
);
1156 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
1157 fh
->fh_seq_id
= rx_fh
->fh_seq_id
;
1158 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1159 fh
->fh_parm_offset
= htonl(1); /* ack single frame */
1161 fr_sof(fp
) = fr_sof(rx_fp
);
1162 if (f_ctl
& FC_FC_END_SEQ
)
1163 fr_eof(fp
) = FC_EOF_T
;
1165 fr_eof(fp
) = FC_EOF_N
;
1167 lport
->tt
.frame_send(lport
, fp
);
1172 * fc_exch_send_ba_rjt() - Send BLS Reject
1173 * @rx_fp: The frame being rejected
1174 * @reason: The reason the frame is being rejected
1175 * @explan: The explanation for the rejection
1177 * This is for rejecting BA_ABTS only.
1179 static void fc_exch_send_ba_rjt(struct fc_frame
*rx_fp
,
1180 enum fc_ba_rjt_reason reason
,
1181 enum fc_ba_rjt_explan explan
)
1183 struct fc_frame
*fp
;
1184 struct fc_frame_header
*rx_fh
;
1185 struct fc_frame_header
*fh
;
1186 struct fc_ba_rjt
*rp
;
1187 struct fc_lport
*lport
;
1190 lport
= fr_dev(rx_fp
);
1191 fp
= fc_frame_alloc(lport
, sizeof(*rp
));
1194 fh
= fc_frame_header_get(fp
);
1195 rx_fh
= fc_frame_header_get(rx_fp
);
1197 memset(fh
, 0, sizeof(*fh
) + sizeof(*rp
));
1199 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
1200 rp
->br_reason
= reason
;
1201 rp
->br_explan
= explan
;
1204 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1206 memcpy(fh
->fh_s_id
, rx_fh
->fh_d_id
, 3);
1207 memcpy(fh
->fh_d_id
, rx_fh
->fh_s_id
, 3);
1208 fh
->fh_ox_id
= rx_fh
->fh_ox_id
;
1209 fh
->fh_rx_id
= rx_fh
->fh_rx_id
;
1210 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1211 fh
->fh_r_ctl
= FC_RCTL_BA_RJT
;
1212 fh
->fh_type
= FC_TYPE_BLS
;
1215 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1216 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1217 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1218 * Last ACK uses bits 7-6 (continue sequence),
1219 * bits 5-4 are meaningful (what kind of ACK to use).
1220 * Always set LAST_SEQ, END_SEQ.
1222 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1223 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1224 FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1225 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1226 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1227 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
1228 f_ctl
&= ~FC_FC_FIRST_SEQ
;
1229 hton24(fh
->fh_f_ctl
, f_ctl
);
1231 fr_sof(fp
) = fc_sof_class(fr_sof(rx_fp
));
1232 fr_eof(fp
) = FC_EOF_T
;
1233 if (fc_sof_needs_ack(fr_sof(fp
)))
1234 fr_eof(fp
) = FC_EOF_N
;
1236 lport
->tt
.frame_send(lport
, fp
);
1240 * fc_exch_recv_abts() - Handle an incoming ABTS
1241 * @ep: The exchange the abort was on
1242 * @rx_fp: The ABTS frame
1244 * This would be for target mode usually, but could be due to lost
1245 * FCP transfer ready, confirm or RRQ. We always handle this as an
1246 * exchange abort, ignoring the parameter.
1248 static void fc_exch_recv_abts(struct fc_exch
*ep
, struct fc_frame
*rx_fp
)
1250 struct fc_frame
*fp
;
1251 struct fc_ba_acc
*ap
;
1252 struct fc_frame_header
*fh
;
1257 spin_lock_bh(&ep
->ex_lock
);
1258 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1259 spin_unlock_bh(&ep
->ex_lock
);
1262 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
))
1263 fc_exch_hold(ep
); /* hold for REC_QUAL */
1264 ep
->esb_stat
|= ESB_ST_ABNORMAL
| ESB_ST_REC_QUAL
;
1265 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
1267 fp
= fc_frame_alloc(ep
->lp
, sizeof(*ap
));
1269 spin_unlock_bh(&ep
->ex_lock
);
1272 fh
= fc_frame_header_get(fp
);
1273 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1274 memset(ap
, 0, sizeof(*ap
));
1276 ap
->ba_high_seq_cnt
= htons(0xffff);
1277 if (sp
->ssb_stat
& SSB_ST_RESP
) {
1278 ap
->ba_seq_id
= sp
->id
;
1279 ap
->ba_seq_id_val
= FC_BA_SEQ_ID_VAL
;
1280 ap
->ba_high_seq_cnt
= fh
->fh_seq_cnt
;
1281 ap
->ba_low_seq_cnt
= htons(sp
->cnt
);
1283 sp
= fc_seq_start_next_locked(sp
);
1284 spin_unlock_bh(&ep
->ex_lock
);
1285 fc_seq_send_last(sp
, fp
, FC_RCTL_BA_ACC
, FC_TYPE_BLS
);
1286 fc_frame_free(rx_fp
);
1290 fc_exch_send_ba_rjt(rx_fp
, FC_BA_RJT_UNABLE
, FC_BA_RJT_INV_XID
);
1292 fc_frame_free(rx_fp
);
1296 * fc_seq_assign() - Assign exchange and sequence for incoming request
1297 * @lport: The local port that received the request
1298 * @fp: The request frame
1300 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
1301 * A reference will be held on the exchange/sequence for the caller, which
1302 * must call fc_seq_release().
1304 static struct fc_seq
*fc_seq_assign(struct fc_lport
*lport
, struct fc_frame
*fp
)
1306 struct fc_exch_mgr_anchor
*ema
;
1308 WARN_ON(lport
!= fr_dev(fp
));
1309 WARN_ON(fr_seq(fp
));
1312 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1313 if ((!ema
->match
|| ema
->match(fp
)) &&
1314 fc_seq_lookup_recip(lport
, ema
->mp
, fp
) == FC_RJT_NONE
)
1320 * fc_seq_release() - Release the hold
1321 * @sp: The sequence.
1323 static void fc_seq_release(struct fc_seq
*sp
)
1325 fc_exch_release(fc_seq_exch(sp
));
1329 * fc_exch_recv_req() - Handler for an incoming request
1330 * @lport: The local port that received the request
1331 * @mp: The EM that the exchange is on
1332 * @fp: The request frame
1334 * This is used when the other end is originating the exchange
1337 static void fc_exch_recv_req(struct fc_lport
*lport
, struct fc_exch_mgr
*mp
,
1338 struct fc_frame
*fp
)
1340 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1341 struct fc_seq
*sp
= NULL
;
1342 struct fc_exch
*ep
= NULL
;
1343 enum fc_pf_rjt_reason reject
;
1345 /* We can have the wrong fc_lport at this point with NPIV, which is a
1346 * problem now that we know a new exchange needs to be allocated
1348 lport
= fc_vport_id_lookup(lport
, ntoh24(fh
->fh_d_id
));
1355 BUG_ON(fr_seq(fp
)); /* XXX remove later */
1358 * If the RX_ID is 0xffff, don't allocate an exchange.
1359 * The upper-level protocol may request one later, if needed.
1361 if (fh
->fh_rx_id
== htons(FC_XID_UNKNOWN
))
1362 return lport
->tt
.lport_recv(lport
, fp
);
1364 reject
= fc_seq_lookup_recip(lport
, mp
, fp
);
1365 if (reject
== FC_RJT_NONE
) {
1366 sp
= fr_seq(fp
); /* sequence will be held */
1367 ep
= fc_seq_exch(sp
);
1368 fc_seq_send_ack(sp
, fp
);
1369 ep
->encaps
= fr_encaps(fp
);
1372 * Call the receive function.
1374 * The receive function may allocate a new sequence
1375 * over the old one, so we shouldn't change the
1376 * sequence after this.
1378 * The frame will be freed by the receive function.
1379 * If new exch resp handler is valid then call that
1383 ep
->resp(sp
, fp
, ep
->arg
);
1385 lport
->tt
.lport_recv(lport
, fp
);
1386 fc_exch_release(ep
); /* release from lookup */
1388 FC_LPORT_DBG(lport
, "exch/seq lookup failed: reject %x\n",
1395 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1396 * end is the originator of the sequence that is a
1397 * response to our initial exchange
1398 * @mp: The EM that the exchange is on
1399 * @fp: The response frame
1401 static void fc_exch_recv_seq_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1403 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1408 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1412 ep
= fc_exch_find(mp
, ntohs(fh
->fh_ox_id
));
1414 atomic_inc(&mp
->stats
.xid_not_found
);
1417 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1418 atomic_inc(&mp
->stats
.xid_not_found
);
1421 if (ep
->rxid
== FC_XID_UNKNOWN
)
1422 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1423 if (ep
->sid
!= 0 && ep
->sid
!= ntoh24(fh
->fh_d_id
)) {
1424 atomic_inc(&mp
->stats
.xid_not_found
);
1427 if (ep
->did
!= ntoh24(fh
->fh_s_id
) &&
1428 ep
->did
!= FC_FID_FLOGI
) {
1429 atomic_inc(&mp
->stats
.xid_not_found
);
1434 if (fc_sof_is_init(sof
)) {
1435 sp
->ssb_stat
|= SSB_ST_RESP
;
1436 sp
->id
= fh
->fh_seq_id
;
1437 } else if (sp
->id
!= fh
->fh_seq_id
) {
1438 atomic_inc(&mp
->stats
.seq_not_found
);
1442 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1444 if (f_ctl
& FC_FC_SEQ_INIT
)
1445 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1447 if (fc_sof_needs_ack(sof
))
1448 fc_seq_send_ack(sp
, fp
);
1450 ex_resp_arg
= ep
->arg
;
1452 if (fh
->fh_type
!= FC_TYPE_FCP
&& fr_eof(fp
) == FC_EOF_T
&&
1453 (f_ctl
& (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) ==
1454 (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) {
1455 spin_lock_bh(&ep
->ex_lock
);
1457 rc
= fc_exch_done_locked(ep
);
1458 WARN_ON(fc_seq_exch(sp
) != ep
);
1459 spin_unlock_bh(&ep
->ex_lock
);
1465 * Call the receive function.
1466 * The sequence is held (has a refcnt) for us,
1467 * but not for the receive function.
1469 * The receive function may allocate a new sequence
1470 * over the old one, so we shouldn't change the
1471 * sequence after this.
1473 * The frame will be freed by the receive function.
1474 * If new exch resp handler is valid then call that
1478 resp(sp
, fp
, ex_resp_arg
);
1481 fc_exch_release(ep
);
1484 fc_exch_release(ep
);
1490 * fc_exch_recv_resp() - Handler for a sequence where other end is
1491 * responding to our sequence
1492 * @mp: The EM that the exchange is on
1493 * @fp: The response frame
1495 static void fc_exch_recv_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1499 sp
= fc_seq_lookup_orig(mp
, fp
); /* doesn't hold sequence */
1502 atomic_inc(&mp
->stats
.xid_not_found
);
1504 atomic_inc(&mp
->stats
.non_bls_resp
);
1510 * fc_exch_abts_resp() - Handler for a response to an ABT
1511 * @ep: The exchange that the frame is on
1512 * @fp: The response frame
1514 * This response would be to an ABTS cancelling an exchange or sequence.
1515 * The response can be either BA_ACC or BA_RJT
1517 static void fc_exch_abts_resp(struct fc_exch
*ep
, struct fc_frame
*fp
)
1519 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
1521 struct fc_frame_header
*fh
;
1522 struct fc_ba_acc
*ap
;
1526 int rc
= 1, has_rec
= 0;
1528 fh
= fc_frame_header_get(fp
);
1529 FC_EXCH_DBG(ep
, "exch: BLS rctl %x - %s\n", fh
->fh_r_ctl
,
1530 fc_exch_rctl_name(fh
->fh_r_ctl
));
1532 if (cancel_delayed_work_sync(&ep
->timeout_work
))
1533 fc_exch_release(ep
); /* release from pending timer hold */
1535 spin_lock_bh(&ep
->ex_lock
);
1536 switch (fh
->fh_r_ctl
) {
1537 case FC_RCTL_BA_ACC
:
1538 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1543 * Decide whether to establish a Recovery Qualifier.
1544 * We do this if there is a non-empty SEQ_CNT range and
1545 * SEQ_ID is the same as the one we aborted.
1547 low
= ntohs(ap
->ba_low_seq_cnt
);
1548 high
= ntohs(ap
->ba_high_seq_cnt
);
1549 if ((ep
->esb_stat
& ESB_ST_REC_QUAL
) == 0 &&
1550 (ap
->ba_seq_id_val
!= FC_BA_SEQ_ID_VAL
||
1551 ap
->ba_seq_id
== ep
->seq_id
) && low
!= high
) {
1552 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1553 fc_exch_hold(ep
); /* hold for recovery qualifier */
1557 case FC_RCTL_BA_RJT
:
1564 ex_resp_arg
= ep
->arg
;
1566 /* do we need to do some other checks here. Can we reuse more of
1567 * fc_exch_recv_seq_resp
1571 * do we want to check END_SEQ as well as LAST_SEQ here?
1573 if (ep
->fh_type
!= FC_TYPE_FCP
&&
1574 ntoh24(fh
->fh_f_ctl
) & FC_FC_LAST_SEQ
)
1575 rc
= fc_exch_done_locked(ep
);
1576 spin_unlock_bh(&ep
->ex_lock
);
1581 resp(sp
, fp
, ex_resp_arg
);
1586 fc_exch_timer_set(ep
, ep
->r_a_tov
);
1591 * fc_exch_recv_bls() - Handler for a BLS sequence
1592 * @mp: The EM that the exchange is on
1593 * @fp: The request frame
1595 * The BLS frame is always a sequence initiated by the remote side.
1596 * We may be either the originator or recipient of the exchange.
1598 static void fc_exch_recv_bls(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1600 struct fc_frame_header
*fh
;
1604 fh
= fc_frame_header_get(fp
);
1605 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1608 ep
= fc_exch_find(mp
, (f_ctl
& FC_FC_EX_CTX
) ?
1609 ntohs(fh
->fh_ox_id
) : ntohs(fh
->fh_rx_id
));
1610 if (ep
&& (f_ctl
& FC_FC_SEQ_INIT
)) {
1611 spin_lock_bh(&ep
->ex_lock
);
1612 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1613 spin_unlock_bh(&ep
->ex_lock
);
1615 if (f_ctl
& FC_FC_SEQ_CTX
) {
1617 * A response to a sequence we initiated.
1618 * This should only be ACKs for class 2 or F.
1620 switch (fh
->fh_r_ctl
) {
1625 FC_EXCH_DBG(ep
, "BLS rctl %x - %s received",
1627 fc_exch_rctl_name(fh
->fh_r_ctl
));
1632 switch (fh
->fh_r_ctl
) {
1633 case FC_RCTL_BA_RJT
:
1634 case FC_RCTL_BA_ACC
:
1636 fc_exch_abts_resp(ep
, fp
);
1640 case FC_RCTL_BA_ABTS
:
1641 fc_exch_recv_abts(ep
, fp
);
1643 default: /* ignore junk */
1649 fc_exch_release(ep
); /* release hold taken by fc_exch_find */
1653 * fc_seq_ls_acc() - Accept sequence with LS_ACC
1654 * @rx_fp: The received frame, not freed here.
1656 * If this fails due to allocation or transmit congestion, assume the
1657 * originator will repeat the sequence.
1659 static void fc_seq_ls_acc(struct fc_frame
*rx_fp
)
1661 struct fc_lport
*lport
;
1662 struct fc_els_ls_acc
*acc
;
1663 struct fc_frame
*fp
;
1665 lport
= fr_dev(rx_fp
);
1666 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1669 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1670 memset(acc
, 0, sizeof(*acc
));
1671 acc
->la_cmd
= ELS_LS_ACC
;
1672 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1673 lport
->tt
.frame_send(lport
, fp
);
1677 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
1678 * @rx_fp: The received frame, not freed here.
1679 * @reason: The reason the sequence is being rejected
1680 * @explan: The explanation for the rejection
1682 * If this fails due to allocation or transmit congestion, assume the
1683 * originator will repeat the sequence.
1685 static void fc_seq_ls_rjt(struct fc_frame
*rx_fp
, enum fc_els_rjt_reason reason
,
1686 enum fc_els_rjt_explan explan
)
1688 struct fc_lport
*lport
;
1689 struct fc_els_ls_rjt
*rjt
;
1690 struct fc_frame
*fp
;
1692 lport
= fr_dev(rx_fp
);
1693 fp
= fc_frame_alloc(lport
, sizeof(*rjt
));
1696 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1697 memset(rjt
, 0, sizeof(*rjt
));
1698 rjt
->er_cmd
= ELS_LS_RJT
;
1699 rjt
->er_reason
= reason
;
1700 rjt
->er_explan
= explan
;
1701 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1702 lport
->tt
.frame_send(lport
, fp
);
1706 * fc_exch_reset() - Reset an exchange
1707 * @ep: The exchange to be reset
1709 static void fc_exch_reset(struct fc_exch
*ep
)
1712 void (*resp
)(struct fc_seq
*, struct fc_frame
*, void *);
1716 spin_lock_bh(&ep
->ex_lock
);
1717 ep
->state
|= FC_EX_RST_CLEANUP
;
1718 if (cancel_delayed_work(&ep
->timeout_work
))
1719 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
1722 if (ep
->esb_stat
& ESB_ST_REC_QUAL
)
1723 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec_qual */
1724 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
1727 rc
= fc_exch_done_locked(ep
);
1728 spin_unlock_bh(&ep
->ex_lock
);
1733 resp(sp
, ERR_PTR(-FC_EX_CLOSED
), arg
);
1737 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1738 * @lport: The local port that the exchange pool is on
1739 * @pool: The exchange pool to be reset
1740 * @sid: The source ID
1741 * @did: The destination ID
1743 * Resets a per cpu exches pool, releasing all of its sequences
1744 * and exchanges. If sid is non-zero then reset only exchanges
1745 * we sourced from the local port's FID. If did is non-zero then
1746 * only reset exchanges destined for the local port's FID.
1748 static void fc_exch_pool_reset(struct fc_lport
*lport
,
1749 struct fc_exch_pool
*pool
,
1753 struct fc_exch
*next
;
1755 spin_lock_bh(&pool
->lock
);
1757 list_for_each_entry_safe(ep
, next
, &pool
->ex_list
, ex_list
) {
1758 if ((lport
== ep
->lp
) &&
1759 (sid
== 0 || sid
== ep
->sid
) &&
1760 (did
== 0 || did
== ep
->did
)) {
1762 spin_unlock_bh(&pool
->lock
);
1766 fc_exch_release(ep
);
1767 spin_lock_bh(&pool
->lock
);
1770 * must restart loop incase while lock
1771 * was down multiple eps were released.
1776 spin_unlock_bh(&pool
->lock
);
1780 * fc_exch_mgr_reset() - Reset all EMs of a local port
1781 * @lport: The local port whose EMs are to be reset
1782 * @sid: The source ID
1783 * @did: The destination ID
1785 * Reset all EMs associated with a given local port. Release all
1786 * sequences and exchanges. If sid is non-zero then reset only the
1787 * exchanges sent from the local port's FID. If did is non-zero then
1788 * reset only exchanges destined for the local port's FID.
1790 void fc_exch_mgr_reset(struct fc_lport
*lport
, u32 sid
, u32 did
)
1792 struct fc_exch_mgr_anchor
*ema
;
1795 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
1796 for_each_possible_cpu(cpu
)
1797 fc_exch_pool_reset(lport
,
1798 per_cpu_ptr(ema
->mp
->pool
, cpu
),
1802 EXPORT_SYMBOL(fc_exch_mgr_reset
);
1805 * fc_exch_lookup() - find an exchange
1806 * @lport: The local port
1807 * @xid: The exchange ID
1809 * Returns exchange pointer with hold for caller, or NULL if not found.
1811 static struct fc_exch
*fc_exch_lookup(struct fc_lport
*lport
, u32 xid
)
1813 struct fc_exch_mgr_anchor
*ema
;
1815 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1816 if (ema
->mp
->min_xid
<= xid
&& xid
<= ema
->mp
->max_xid
)
1817 return fc_exch_find(ema
->mp
, xid
);
1822 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
1823 * @rfp: The REC frame, not freed here.
1825 * Note that the requesting port may be different than the S_ID in the request.
1827 static void fc_exch_els_rec(struct fc_frame
*rfp
)
1829 struct fc_lport
*lport
;
1830 struct fc_frame
*fp
;
1832 struct fc_els_rec
*rp
;
1833 struct fc_els_rec_acc
*acc
;
1834 enum fc_els_rjt_reason reason
= ELS_RJT_LOGIC
;
1835 enum fc_els_rjt_explan explan
;
1840 lport
= fr_dev(rfp
);
1841 rp
= fc_frame_payload_get(rfp
, sizeof(*rp
));
1842 explan
= ELS_EXPL_INV_LEN
;
1845 sid
= ntoh24(rp
->rec_s_id
);
1846 rxid
= ntohs(rp
->rec_rx_id
);
1847 oxid
= ntohs(rp
->rec_ox_id
);
1849 ep
= fc_exch_lookup(lport
,
1850 sid
== fc_host_port_id(lport
->host
) ? oxid
: rxid
);
1851 explan
= ELS_EXPL_OXID_RXID
;
1854 if (ep
->oid
!= sid
|| oxid
!= ep
->oxid
)
1856 if (rxid
!= FC_XID_UNKNOWN
&& rxid
!= ep
->rxid
)
1858 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1862 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1863 memset(acc
, 0, sizeof(*acc
));
1864 acc
->reca_cmd
= ELS_LS_ACC
;
1865 acc
->reca_ox_id
= rp
->rec_ox_id
;
1866 memcpy(acc
->reca_ofid
, rp
->rec_s_id
, 3);
1867 acc
->reca_rx_id
= htons(ep
->rxid
);
1868 if (ep
->sid
== ep
->oid
)
1869 hton24(acc
->reca_rfid
, ep
->did
);
1871 hton24(acc
->reca_rfid
, ep
->sid
);
1872 acc
->reca_fc4value
= htonl(ep
->seq
.rec_data
);
1873 acc
->reca_e_stat
= htonl(ep
->esb_stat
& (ESB_ST_RESP
|
1876 fc_fill_reply_hdr(fp
, rfp
, FC_RCTL_ELS_REP
, 0);
1877 lport
->tt
.frame_send(lport
, fp
);
1879 fc_exch_release(ep
);
1883 fc_exch_release(ep
);
1885 fc_seq_ls_rjt(rfp
, reason
, explan
);
1889 * fc_exch_rrq_resp() - Handler for RRQ responses
1890 * @sp: The sequence that the RRQ is on
1891 * @fp: The RRQ frame
1892 * @arg: The exchange that the RRQ is on
1894 * TODO: fix error handler.
1896 static void fc_exch_rrq_resp(struct fc_seq
*sp
, struct fc_frame
*fp
, void *arg
)
1898 struct fc_exch
*aborted_ep
= arg
;
1902 int err
= PTR_ERR(fp
);
1904 if (err
== -FC_EX_CLOSED
|| err
== -FC_EX_TIMEOUT
)
1906 FC_EXCH_DBG(aborted_ep
, "Cannot process RRQ, "
1907 "frame error %d\n", err
);
1911 op
= fc_frame_payload_op(fp
);
1916 FC_EXCH_DBG(aborted_ep
, "LS_RJT for RRQ");
1921 FC_EXCH_DBG(aborted_ep
, "unexpected response op %x "
1927 fc_exch_done(&aborted_ep
->seq
);
1928 /* drop hold for rec qual */
1929 fc_exch_release(aborted_ep
);
1934 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
1935 * @lport: The local port to send the frame on
1936 * @fp: The frame to be sent
1937 * @resp: The response handler for this request
1938 * @destructor: The destructor for the exchange
1939 * @arg: The argument to be passed to the response handler
1940 * @timer_msec: The timeout period for the exchange
1942 * The frame pointer with some of the header's fields must be
1943 * filled before calling this routine, those fields are:
1950 * - parameter or relative offset
1952 static struct fc_seq
*fc_exch_seq_send(struct fc_lport
*lport
,
1953 struct fc_frame
*fp
,
1954 void (*resp
)(struct fc_seq
*,
1955 struct fc_frame
*fp
,
1957 void (*destructor
)(struct fc_seq
*,
1959 void *arg
, u32 timer_msec
)
1962 struct fc_seq
*sp
= NULL
;
1963 struct fc_frame_header
*fh
;
1966 ep
= fc_exch_alloc(lport
, fp
);
1971 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1972 fh
= fc_frame_header_get(fp
);
1973 fc_exch_set_addr(ep
, ntoh24(fh
->fh_s_id
), ntoh24(fh
->fh_d_id
));
1975 ep
->destructor
= destructor
;
1977 ep
->r_a_tov
= FC_DEF_R_A_TOV
;
1981 ep
->fh_type
= fh
->fh_type
; /* save for possbile timeout handling */
1982 ep
->f_ctl
= ntoh24(fh
->fh_f_ctl
);
1983 fc_exch_setup_hdr(ep
, fp
, ep
->f_ctl
);
1986 if (ep
->xid
<= lport
->lro_xid
&& fh
->fh_r_ctl
== FC_RCTL_DD_UNSOL_CMD
)
1987 fc_fcp_ddp_setup(fr_fsp(fp
), ep
->xid
);
1989 if (unlikely(lport
->tt
.frame_send(lport
, fp
)))
1993 fc_exch_timer_set_locked(ep
, timer_msec
);
1994 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not first seq */
1996 if (ep
->f_ctl
& FC_FC_SEQ_INIT
)
1997 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
1998 spin_unlock_bh(&ep
->ex_lock
);
2001 fc_fcp_ddp_done(fr_fsp(fp
));
2002 rc
= fc_exch_done_locked(ep
);
2003 spin_unlock_bh(&ep
->ex_lock
);
2010 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
2011 * @ep: The exchange to send the RRQ on
2013 * This tells the remote port to stop blocking the use of
2014 * the exchange and the seq_cnt range.
2016 static void fc_exch_rrq(struct fc_exch
*ep
)
2018 struct fc_lport
*lport
;
2019 struct fc_els_rrq
*rrq
;
2020 struct fc_frame
*fp
;
2025 fp
= fc_frame_alloc(lport
, sizeof(*rrq
));
2029 rrq
= fc_frame_payload_get(fp
, sizeof(*rrq
));
2030 memset(rrq
, 0, sizeof(*rrq
));
2031 rrq
->rrq_cmd
= ELS_RRQ
;
2032 hton24(rrq
->rrq_s_id
, ep
->sid
);
2033 rrq
->rrq_ox_id
= htons(ep
->oxid
);
2034 rrq
->rrq_rx_id
= htons(ep
->rxid
);
2037 if (ep
->esb_stat
& ESB_ST_RESP
)
2040 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, did
,
2041 lport
->port_id
, FC_TYPE_ELS
,
2042 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
2044 if (fc_exch_seq_send(lport
, fp
, fc_exch_rrq_resp
, NULL
, ep
,
2049 spin_lock_bh(&ep
->ex_lock
);
2050 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
)) {
2051 spin_unlock_bh(&ep
->ex_lock
);
2052 /* drop hold for rec qual */
2053 fc_exch_release(ep
);
2056 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
2057 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
2058 spin_unlock_bh(&ep
->ex_lock
);
2062 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
2063 * @fp: The RRQ frame, not freed here.
2065 static void fc_exch_els_rrq(struct fc_frame
*fp
)
2067 struct fc_lport
*lport
;
2068 struct fc_exch
*ep
= NULL
; /* request or subject exchange */
2069 struct fc_els_rrq
*rp
;
2072 enum fc_els_rjt_explan explan
;
2075 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
2076 explan
= ELS_EXPL_INV_LEN
;
2081 * lookup subject exchange.
2083 sid
= ntoh24(rp
->rrq_s_id
); /* subject source */
2084 xid
= fc_host_port_id(lport
->host
) == sid
?
2085 ntohs(rp
->rrq_ox_id
) : ntohs(rp
->rrq_rx_id
);
2086 ep
= fc_exch_lookup(lport
, xid
);
2087 explan
= ELS_EXPL_OXID_RXID
;
2090 spin_lock_bh(&ep
->ex_lock
);
2091 if (ep
->oxid
!= ntohs(rp
->rrq_ox_id
))
2093 if (ep
->rxid
!= ntohs(rp
->rrq_rx_id
) &&
2094 ep
->rxid
!= FC_XID_UNKNOWN
)
2096 explan
= ELS_EXPL_SID
;
2101 * Clear Recovery Qualifier state, and cancel timer if complete.
2103 if (ep
->esb_stat
& ESB_ST_REC_QUAL
) {
2104 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
2105 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec qual */
2107 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
2108 if (cancel_delayed_work(&ep
->timeout_work
))
2109 atomic_dec(&ep
->ex_refcnt
); /* drop timer hold */
2112 spin_unlock_bh(&ep
->ex_lock
);
2121 spin_unlock_bh(&ep
->ex_lock
);
2123 fc_seq_ls_rjt(fp
, ELS_RJT_LOGIC
, explan
);
2126 fc_exch_release(ep
); /* drop hold from fc_exch_find */
2130 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
2131 * @lport: The local port to add the exchange manager to
2132 * @mp: The exchange manager to be added to the local port
2133 * @match: The match routine that indicates when this EM should be used
2135 struct fc_exch_mgr_anchor
*fc_exch_mgr_add(struct fc_lport
*lport
,
2136 struct fc_exch_mgr
*mp
,
2137 bool (*match
)(struct fc_frame
*))
2139 struct fc_exch_mgr_anchor
*ema
;
2141 ema
= kmalloc(sizeof(*ema
), GFP_ATOMIC
);
2147 /* add EM anchor to EM anchors list */
2148 list_add_tail(&ema
->ema_list
, &lport
->ema_list
);
2149 kref_get(&mp
->kref
);
2152 EXPORT_SYMBOL(fc_exch_mgr_add
);
2155 * fc_exch_mgr_destroy() - Destroy an exchange manager
2156 * @kref: The reference to the EM to be destroyed
2158 static void fc_exch_mgr_destroy(struct kref
*kref
)
2160 struct fc_exch_mgr
*mp
= container_of(kref
, struct fc_exch_mgr
, kref
);
2162 mempool_destroy(mp
->ep_pool
);
2163 free_percpu(mp
->pool
);
2168 * fc_exch_mgr_del() - Delete an EM from a local port's list
2169 * @ema: The exchange manager anchor identifying the EM to be deleted
2171 void fc_exch_mgr_del(struct fc_exch_mgr_anchor
*ema
)
2173 /* remove EM anchor from EM anchors list */
2174 list_del(&ema
->ema_list
);
2175 kref_put(&ema
->mp
->kref
, fc_exch_mgr_destroy
);
2178 EXPORT_SYMBOL(fc_exch_mgr_del
);
2181 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2182 * @src: Source lport to clone exchange managers from
2183 * @dst: New lport that takes references to all the exchange managers
2185 int fc_exch_mgr_list_clone(struct fc_lport
*src
, struct fc_lport
*dst
)
2187 struct fc_exch_mgr_anchor
*ema
, *tmp
;
2189 list_for_each_entry(ema
, &src
->ema_list
, ema_list
) {
2190 if (!fc_exch_mgr_add(dst
, ema
->mp
, ema
->match
))
2195 list_for_each_entry_safe(ema
, tmp
, &dst
->ema_list
, ema_list
)
2196 fc_exch_mgr_del(ema
);
2199 EXPORT_SYMBOL(fc_exch_mgr_list_clone
);
2202 * fc_exch_mgr_alloc() - Allocate an exchange manager
2203 * @lport: The local port that the new EM will be associated with
2204 * @class: The default FC class for new exchanges
2205 * @min_xid: The minimum XID for exchanges from the new EM
2206 * @max_xid: The maximum XID for exchanges from the new EM
2207 * @match: The match routine for the new EM
2209 struct fc_exch_mgr
*fc_exch_mgr_alloc(struct fc_lport
*lport
,
2210 enum fc_class
class,
2211 u16 min_xid
, u16 max_xid
,
2212 bool (*match
)(struct fc_frame
*))
2214 struct fc_exch_mgr
*mp
;
2215 u16 pool_exch_range
;
2218 struct fc_exch_pool
*pool
;
2220 if (max_xid
<= min_xid
|| max_xid
== FC_XID_UNKNOWN
||
2221 (min_xid
& fc_cpu_mask
) != 0) {
2222 FC_LPORT_DBG(lport
, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
2228 * allocate memory for EM
2230 mp
= kzalloc(sizeof(struct fc_exch_mgr
), GFP_ATOMIC
);
2235 /* adjust em exch xid range for offload */
2236 mp
->min_xid
= min_xid
;
2237 mp
->max_xid
= max_xid
;
2239 mp
->ep_pool
= mempool_create_slab_pool(2, fc_em_cachep
);
2244 * Setup per cpu exch pool with entire exchange id range equally
2245 * divided across all cpus. The exch pointers array memory is
2246 * allocated for exch range per pool.
2248 pool_exch_range
= (mp
->max_xid
- mp
->min_xid
+ 1) / (fc_cpu_mask
+ 1);
2249 mp
->pool_max_index
= pool_exch_range
- 1;
2252 * Allocate and initialize per cpu exch pool
2254 pool_size
= sizeof(*pool
) + pool_exch_range
* sizeof(struct fc_exch
*);
2255 mp
->pool
= __alloc_percpu(pool_size
, __alignof__(struct fc_exch_pool
));
2258 for_each_possible_cpu(cpu
) {
2259 pool
= per_cpu_ptr(mp
->pool
, cpu
);
2260 pool
->left
= FC_XID_UNKNOWN
;
2261 pool
->right
= FC_XID_UNKNOWN
;
2262 spin_lock_init(&pool
->lock
);
2263 INIT_LIST_HEAD(&pool
->ex_list
);
2266 kref_init(&mp
->kref
);
2267 if (!fc_exch_mgr_add(lport
, mp
, match
)) {
2268 free_percpu(mp
->pool
);
2273 * Above kref_init() sets mp->kref to 1 and then
2274 * call to fc_exch_mgr_add incremented mp->kref again,
2275 * so adjust that extra increment.
2277 kref_put(&mp
->kref
, fc_exch_mgr_destroy
);
2281 mempool_destroy(mp
->ep_pool
);
2286 EXPORT_SYMBOL(fc_exch_mgr_alloc
);
2289 * fc_exch_mgr_free() - Free all exchange managers on a local port
2290 * @lport: The local port whose EMs are to be freed
2292 void fc_exch_mgr_free(struct fc_lport
*lport
)
2294 struct fc_exch_mgr_anchor
*ema
, *next
;
2296 flush_workqueue(fc_exch_workqueue
);
2297 list_for_each_entry_safe(ema
, next
, &lport
->ema_list
, ema_list
)
2298 fc_exch_mgr_del(ema
);
2300 EXPORT_SYMBOL(fc_exch_mgr_free
);
2303 * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending
2306 * @lport: The local port the frame was received on
2307 * @fh: The received frame header
2309 static struct fc_exch_mgr_anchor
*fc_find_ema(u32 f_ctl
,
2310 struct fc_lport
*lport
,
2311 struct fc_frame_header
*fh
)
2313 struct fc_exch_mgr_anchor
*ema
;
2316 if (f_ctl
& FC_FC_EX_CTX
)
2317 xid
= ntohs(fh
->fh_ox_id
);
2319 xid
= ntohs(fh
->fh_rx_id
);
2320 if (xid
== FC_XID_UNKNOWN
)
2321 return list_entry(lport
->ema_list
.prev
,
2322 typeof(*ema
), ema_list
);
2325 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
2326 if ((xid
>= ema
->mp
->min_xid
) &&
2327 (xid
<= ema
->mp
->max_xid
))
2333 * fc_exch_recv() - Handler for received frames
2334 * @lport: The local port the frame was received on
2335 * @fp: The received frame
2337 void fc_exch_recv(struct fc_lport
*lport
, struct fc_frame
*fp
)
2339 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
2340 struct fc_exch_mgr_anchor
*ema
;
2344 if (!lport
|| lport
->state
== LPORT_ST_DISABLED
) {
2345 FC_LPORT_DBG(lport
, "Receiving frames for an lport that "
2346 "has not been initialized correctly\n");
2351 f_ctl
= ntoh24(fh
->fh_f_ctl
);
2352 ema
= fc_find_ema(f_ctl
, lport
, fh
);
2354 FC_LPORT_DBG(lport
, "Unable to find Exchange Manager Anchor,"
2355 "fc_ctl <0x%x>, xid <0x%x>\n",
2357 (f_ctl
& FC_FC_EX_CTX
) ?
2358 ntohs(fh
->fh_ox_id
) :
2359 ntohs(fh
->fh_rx_id
));
2365 * If frame is marked invalid, just drop it.
2367 switch (fr_eof(fp
)) {
2369 if (f_ctl
& FC_FC_END_SEQ
)
2370 skb_trim(fp_skb(fp
), fr_len(fp
) - FC_FC_FILL(f_ctl
));
2373 if (fh
->fh_type
== FC_TYPE_BLS
)
2374 fc_exch_recv_bls(ema
->mp
, fp
);
2375 else if ((f_ctl
& (FC_FC_EX_CTX
| FC_FC_SEQ_CTX
)) ==
2377 fc_exch_recv_seq_resp(ema
->mp
, fp
);
2378 else if (f_ctl
& FC_FC_SEQ_CTX
)
2379 fc_exch_recv_resp(ema
->mp
, fp
);
2380 else /* no EX_CTX and no SEQ_CTX */
2381 fc_exch_recv_req(lport
, ema
->mp
, fp
);
2384 FC_LPORT_DBG(lport
, "dropping invalid frame (eof %x)",
2389 EXPORT_SYMBOL(fc_exch_recv
);
2392 * fc_exch_init() - Initialize the exchange layer for a local port
2393 * @lport: The local port to initialize the exchange layer for
2395 int fc_exch_init(struct fc_lport
*lport
)
2397 if (!lport
->tt
.seq_start_next
)
2398 lport
->tt
.seq_start_next
= fc_seq_start_next
;
2400 if (!lport
->tt
.seq_set_resp
)
2401 lport
->tt
.seq_set_resp
= fc_seq_set_resp
;
2403 if (!lport
->tt
.exch_seq_send
)
2404 lport
->tt
.exch_seq_send
= fc_exch_seq_send
;
2406 if (!lport
->tt
.seq_send
)
2407 lport
->tt
.seq_send
= fc_seq_send
;
2409 if (!lport
->tt
.seq_els_rsp_send
)
2410 lport
->tt
.seq_els_rsp_send
= fc_seq_els_rsp_send
;
2412 if (!lport
->tt
.exch_done
)
2413 lport
->tt
.exch_done
= fc_exch_done
;
2415 if (!lport
->tt
.exch_mgr_reset
)
2416 lport
->tt
.exch_mgr_reset
= fc_exch_mgr_reset
;
2418 if (!lport
->tt
.seq_exch_abort
)
2419 lport
->tt
.seq_exch_abort
= fc_seq_exch_abort
;
2421 if (!lport
->tt
.seq_assign
)
2422 lport
->tt
.seq_assign
= fc_seq_assign
;
2424 if (!lport
->tt
.seq_release
)
2425 lport
->tt
.seq_release
= fc_seq_release
;
2429 EXPORT_SYMBOL(fc_exch_init
);
2432 * fc_setup_exch_mgr() - Setup an exchange manager
2434 int fc_setup_exch_mgr(void)
2436 fc_em_cachep
= kmem_cache_create("libfc_em", sizeof(struct fc_exch
),
2437 0, SLAB_HWCACHE_ALIGN
, NULL
);
2442 * Initialize fc_cpu_mask and fc_cpu_order. The
2443 * fc_cpu_mask is set for nr_cpu_ids rounded up
2444 * to order of 2's * power and order is stored
2445 * in fc_cpu_order as this is later required in
2446 * mapping between an exch id and exch array index
2447 * in per cpu exch pool.
2449 * This round up is required to align fc_cpu_mask
2450 * to exchange id's lower bits such that all incoming
2451 * frames of an exchange gets delivered to the same
2452 * cpu on which exchange originated by simple bitwise
2453 * AND operation between fc_cpu_mask and exchange id.
2457 while (fc_cpu_mask
< nr_cpu_ids
) {
2463 fc_exch_workqueue
= create_singlethread_workqueue("fc_exch_workqueue");
2464 if (!fc_exch_workqueue
)
2468 kmem_cache_destroy(fc_em_cachep
);
2473 * fc_destroy_exch_mgr() - Destroy an exchange manager
2475 void fc_destroy_exch_mgr(void)
2477 destroy_workqueue(fc_exch_workqueue
);
2478 kmem_cache_destroy(fc_em_cachep
);