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>
30 #include <linux/log2.h>
32 #include <scsi/fc/fc_fc2.h>
34 #include <scsi/libfc.h>
35 #include <scsi/fc_encode.h>
39 u16 fc_cpu_mask
; /* cpu mask for possible cpus */
40 EXPORT_SYMBOL(fc_cpu_mask
);
41 static u16 fc_cpu_order
; /* 2's power to represent total possible cpus */
42 static struct kmem_cache
*fc_em_cachep
; /* cache for exchanges */
43 static struct workqueue_struct
*fc_exch_workqueue
;
46 * Structure and function definitions for managing Fibre Channel Exchanges
49 * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
51 * fc_exch_mgr holds the exchange state for an N port
53 * fc_exch holds state for one exchange and links to its active sequence.
55 * fc_seq holds the state for an individual sequence.
59 * struct fc_exch_pool - Per cpu exchange pool
60 * @next_index: Next possible free exchange index
61 * @total_exches: Total allocated exchanges
62 * @lock: Exch pool lock
63 * @ex_list: List of exchanges
65 * This structure manages per cpu exchanges in array of exchange pointers.
66 * This array is allocated followed by struct fc_exch_pool memory for
67 * assigned range of exchanges to per cpu pool.
71 struct list_head ex_list
;
75 /* two cache of free slot in exch array */
78 } ____cacheline_aligned_in_smp
;
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.
95 struct fc_exch_pool __percpu
*pool
;
104 atomic_t no_free_exch
;
105 atomic_t no_free_exch_xid
;
106 atomic_t xid_not_found
;
108 atomic_t seq_not_found
;
109 atomic_t non_bls_resp
;
114 * struct fc_exch_mgr_anchor - primary structure for list of EMs
115 * @ema_list: Exchange Manager Anchor list
116 * @mp: Exchange Manager associated with this anchor
117 * @match: Routine to determine if this anchor's EM should be used
119 * When walking the list of anchors the match routine will be called
120 * for each anchor to determine if that EM should be used. The last
121 * anchor in the list will always match to handle any exchanges not
122 * handled by other EMs. The non-default EMs would be added to the
123 * anchor list by HW that provides offloads.
125 struct fc_exch_mgr_anchor
{
126 struct list_head ema_list
;
127 struct fc_exch_mgr
*mp
;
128 bool (*match
)(struct fc_frame
*);
131 static void fc_exch_rrq(struct fc_exch
*);
132 static void fc_seq_ls_acc(struct fc_frame
*);
133 static void fc_seq_ls_rjt(struct fc_frame
*, enum fc_els_rjt_reason
,
134 enum fc_els_rjt_explan
);
135 static void fc_exch_els_rec(struct fc_frame
*);
136 static void fc_exch_els_rrq(struct fc_frame
*);
139 * Internal implementation notes.
141 * The exchange manager is one by default in libfc but LLD may choose
142 * to have one per CPU. The sequence manager is one per exchange manager
143 * and currently never separated.
145 * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
146 * assigned by the Sequence Initiator that shall be unique for a specific
147 * D_ID and S_ID pair while the Sequence is open." Note that it isn't
148 * qualified by exchange ID, which one might think it would be.
149 * In practice this limits the number of open sequences and exchanges to 256
150 * per session. For most targets we could treat this limit as per exchange.
152 * The exchange and its sequence are freed when the last sequence is received.
153 * It's possible for the remote port to leave an exchange open without
154 * sending any sequences.
156 * Notes on reference counts:
158 * Exchanges are reference counted and exchange gets freed when the reference
159 * count becomes zero.
162 * Sequences are timed out for E_D_TOV and R_A_TOV.
164 * Sequence event handling:
166 * The following events may occur on initiator sequences:
169 * For now, the whole thing is sent.
171 * This applies only to class F.
172 * The sequence is marked complete.
174 * The upper layer calls fc_exch_done() when done
175 * with exchange and sequence tuple.
176 * RX-inferred completion.
177 * When we receive the next sequence on the same exchange, we can
178 * retire the previous sequence ID. (XXX not implemented).
180 * R_A_TOV frees the sequence ID. If we're waiting for ACK,
181 * E_D_TOV causes abort and calls upper layer response handler
182 * with FC_EX_TIMEOUT error.
188 * The following events may occur on recipient sequences:
191 * Allocate sequence for first frame received.
192 * Hold during receive handler.
193 * Release when final frame received.
194 * Keep status of last N of these for the ELS RES command. XXX TBD.
196 * Deallocate sequence
200 * For now, we neglect conditions where only part of a sequence was
201 * received or transmitted, or where out-of-order receipt is detected.
207 * The EM code run in a per-CPU worker thread.
209 * To protect against concurrency between a worker thread code and timers,
210 * sequence allocation and deallocation must be locked.
211 * - exchange refcnt can be done atomicly without locks.
212 * - sequence allocation must be locked by exch lock.
213 * - If the EM pool lock and ex_lock must be taken at the same time, then the
214 * EM pool lock must be taken before the ex_lock.
218 * opcode names for debugging.
220 static char *fc_exch_rctl_names
[] = FC_RCTL_NAMES_INIT
;
223 * fc_exch_name_lookup() - Lookup name by opcode
224 * @op: Opcode to be looked up
225 * @table: Opcode/name table
226 * @max_index: Index not to be exceeded
228 * This routine is used to determine a human-readable string identifying
231 static inline const char *fc_exch_name_lookup(unsigned int op
, char **table
,
232 unsigned int max_index
)
234 const char *name
= NULL
;
244 * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup()
245 * @op: The opcode to be looked up
247 static const char *fc_exch_rctl_name(unsigned int op
)
249 return fc_exch_name_lookup(op
, fc_exch_rctl_names
,
250 ARRAY_SIZE(fc_exch_rctl_names
));
254 * fc_exch_hold() - Increment an exchange's reference count
255 * @ep: Echange to be held
257 static inline void fc_exch_hold(struct fc_exch
*ep
)
259 atomic_inc(&ep
->ex_refcnt
);
263 * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields
264 * and determine SOF and EOF.
265 * @ep: The exchange to that will use the header
266 * @fp: The frame whose header is to be modified
267 * @f_ctl: F_CTL bits that will be used for the frame header
269 * The fields initialized by this routine are: fh_ox_id, fh_rx_id,
270 * fh_seq_id, fh_seq_cnt and the SOF and EOF.
272 static void fc_exch_setup_hdr(struct fc_exch
*ep
, struct fc_frame
*fp
,
275 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
278 fr_sof(fp
) = ep
->class;
280 fr_sof(fp
) = fc_sof_normal(ep
->class);
282 if (f_ctl
& FC_FC_END_SEQ
) {
283 fr_eof(fp
) = FC_EOF_T
;
284 if (fc_sof_needs_ack(ep
->class))
285 fr_eof(fp
) = FC_EOF_N
;
288 * The number of fill bytes to make the length a 4-byte
289 * multiple is the low order 2-bits of the f_ctl.
290 * The fill itself will have been cleared by the frame
292 * After this, the length will be even, as expected by
295 fill
= fr_len(fp
) & 3;
298 /* TODO, this may be a problem with fragmented skb */
299 skb_put(fp_skb(fp
), fill
);
300 hton24(fh
->fh_f_ctl
, f_ctl
| fill
);
303 WARN_ON(fr_len(fp
) % 4 != 0); /* no pad to non last frame */
304 fr_eof(fp
) = FC_EOF_N
;
307 /* Initialize remaining fh fields from fc_fill_fc_hdr */
308 fh
->fh_ox_id
= htons(ep
->oxid
);
309 fh
->fh_rx_id
= htons(ep
->rxid
);
310 fh
->fh_seq_id
= ep
->seq
.id
;
311 fh
->fh_seq_cnt
= htons(ep
->seq
.cnt
);
315 * fc_exch_release() - Decrement an exchange's reference count
316 * @ep: Exchange to be released
318 * If the reference count reaches zero and the exchange is complete,
321 static void fc_exch_release(struct fc_exch
*ep
)
323 struct fc_exch_mgr
*mp
;
325 if (atomic_dec_and_test(&ep
->ex_refcnt
)) {
328 ep
->destructor(&ep
->seq
, ep
->arg
);
329 WARN_ON(!(ep
->esb_stat
& ESB_ST_COMPLETE
));
330 mempool_free(ep
, mp
->ep_pool
);
335 * fc_exch_timer_cancel() - cancel exch timer
336 * @ep: The exchange whose timer to be canceled
338 static inline void fc_exch_timer_cancel(struct fc_exch
*ep
)
340 if (cancel_delayed_work(&ep
->timeout_work
)) {
341 FC_EXCH_DBG(ep
, "Exchange timer canceled\n");
342 atomic_dec(&ep
->ex_refcnt
); /* drop hold for timer */
347 * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the
348 * the exchange lock held
349 * @ep: The exchange whose timer will start
350 * @timer_msec: The timeout period
352 * Used for upper level protocols to time out the exchange.
353 * The timer is cancelled when it fires or when the exchange completes.
355 static inline void fc_exch_timer_set_locked(struct fc_exch
*ep
,
356 unsigned int timer_msec
)
358 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
361 FC_EXCH_DBG(ep
, "Exchange timer armed : %d msecs\n", timer_msec
);
363 fc_exch_hold(ep
); /* hold for timer */
364 if (!queue_delayed_work(fc_exch_workqueue
, &ep
->timeout_work
,
365 msecs_to_jiffies(timer_msec
)))
370 * fc_exch_timer_set() - Lock the exchange and set the timer
371 * @ep: The exchange whose timer will start
372 * @timer_msec: The timeout period
374 static void fc_exch_timer_set(struct fc_exch
*ep
, unsigned int timer_msec
)
376 spin_lock_bh(&ep
->ex_lock
);
377 fc_exch_timer_set_locked(ep
, timer_msec
);
378 spin_unlock_bh(&ep
->ex_lock
);
382 * fc_exch_done_locked() - Complete an exchange with the exchange lock held
383 * @ep: The exchange that is complete
385 * Note: May sleep if invoked from outside a response handler.
387 static int fc_exch_done_locked(struct fc_exch
*ep
)
392 * We must check for completion in case there are two threads
393 * tyring to complete this. But the rrq code will reuse the
394 * ep, and in that case we only clear the resp and set it as
395 * complete, so it can be reused by the timer to send the rrq.
397 if (ep
->state
& FC_EX_DONE
)
399 ep
->esb_stat
|= ESB_ST_COMPLETE
;
401 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
)) {
402 ep
->state
|= FC_EX_DONE
;
403 fc_exch_timer_cancel(ep
);
410 * fc_exch_ptr_get() - Return an exchange from an exchange pool
411 * @pool: Exchange Pool to get an exchange from
412 * @index: Index of the exchange within the pool
414 * Use the index to get an exchange from within an exchange pool. exches
415 * will point to an array of exchange pointers. The index will select
416 * the exchange within the array.
418 static inline struct fc_exch
*fc_exch_ptr_get(struct fc_exch_pool
*pool
,
421 struct fc_exch
**exches
= (struct fc_exch
**)(pool
+ 1);
422 return exches
[index
];
426 * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool
427 * @pool: The pool to assign the exchange to
428 * @index: The index in the pool where the exchange will be assigned
429 * @ep: The exchange to assign to the pool
431 static inline void fc_exch_ptr_set(struct fc_exch_pool
*pool
, u16 index
,
434 ((struct fc_exch
**)(pool
+ 1))[index
] = ep
;
438 * fc_exch_delete() - Delete an exchange
439 * @ep: The exchange to be deleted
441 static void fc_exch_delete(struct fc_exch
*ep
)
443 struct fc_exch_pool
*pool
;
447 spin_lock_bh(&pool
->lock
);
448 WARN_ON(pool
->total_exches
<= 0);
449 pool
->total_exches
--;
451 /* update cache of free slot */
452 index
= (ep
->xid
- ep
->em
->min_xid
) >> fc_cpu_order
;
453 if (pool
->left
== FC_XID_UNKNOWN
)
455 else if (pool
->right
== FC_XID_UNKNOWN
)
458 pool
->next_index
= index
;
460 fc_exch_ptr_set(pool
, index
, NULL
);
461 list_del(&ep
->ex_list
);
462 spin_unlock_bh(&pool
->lock
);
463 fc_exch_release(ep
); /* drop hold for exch in mp */
466 static int fc_seq_send_locked(struct fc_lport
*lport
, struct fc_seq
*sp
,
470 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
473 u8 fh_type
= fh
->fh_type
;
475 ep
= fc_seq_exch(sp
);
477 if (ep
->esb_stat
& (ESB_ST_COMPLETE
| ESB_ST_ABNORMAL
)) {
482 WARN_ON(!(ep
->esb_stat
& ESB_ST_SEQ_INIT
));
484 f_ctl
= ntoh24(fh
->fh_f_ctl
);
485 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
486 fr_encaps(fp
) = ep
->encaps
;
489 * update sequence count if this frame is carrying
490 * multiple FC frames when sequence offload is enabled
493 if (fr_max_payload(fp
))
494 sp
->cnt
+= DIV_ROUND_UP((fr_len(fp
) - sizeof(*fh
)),
502 error
= lport
->tt
.frame_send(lport
, fp
);
504 if (fh_type
== FC_TYPE_BLS
)
508 * Update the exchange and sequence flags,
509 * assuming all frames for the sequence have been sent.
510 * We can only be called to send once for each sequence.
512 ep
->f_ctl
= f_ctl
& ~FC_FC_FIRST_SEQ
; /* not first seq */
513 if (f_ctl
& FC_FC_SEQ_INIT
)
514 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
520 * fc_seq_send() - Send a frame using existing sequence/exchange pair
521 * @lport: The local port that the exchange will be sent on
522 * @sp: The sequence to be sent
523 * @fp: The frame to be sent on the exchange
525 * Note: The frame will be freed either by a direct call to fc_frame_free(fp)
526 * or indirectly by calling libfc_function_template.frame_send().
528 static int fc_seq_send(struct fc_lport
*lport
, struct fc_seq
*sp
,
533 ep
= fc_seq_exch(sp
);
534 spin_lock_bh(&ep
->ex_lock
);
535 error
= fc_seq_send_locked(lport
, sp
, fp
);
536 spin_unlock_bh(&ep
->ex_lock
);
541 * fc_seq_alloc() - Allocate a sequence for a given exchange
542 * @ep: The exchange to allocate a new sequence for
543 * @seq_id: The sequence ID to be used
545 * We don't support multiple originated sequences on the same exchange.
546 * By implication, any previously originated sequence on this exchange
547 * is complete, and we reallocate the same sequence.
549 static struct fc_seq
*fc_seq_alloc(struct fc_exch
*ep
, u8 seq_id
)
561 * fc_seq_start_next_locked() - Allocate a new sequence on the same
562 * exchange as the supplied sequence
563 * @sp: The sequence/exchange to get a new sequence for
565 static struct fc_seq
*fc_seq_start_next_locked(struct fc_seq
*sp
)
567 struct fc_exch
*ep
= fc_seq_exch(sp
);
569 sp
= fc_seq_alloc(ep
, ep
->seq_id
++);
570 FC_EXCH_DBG(ep
, "f_ctl %6x seq %2x\n",
576 * fc_seq_start_next() - Lock the exchange and get a new sequence
577 * for a given sequence/exchange pair
578 * @sp: The sequence/exchange to get a new exchange for
580 static struct fc_seq
*fc_seq_start_next(struct fc_seq
*sp
)
582 struct fc_exch
*ep
= fc_seq_exch(sp
);
584 spin_lock_bh(&ep
->ex_lock
);
585 sp
= fc_seq_start_next_locked(sp
);
586 spin_unlock_bh(&ep
->ex_lock
);
592 * Set the response handler for the exchange associated with a sequence.
594 * Note: May sleep if invoked from outside a response handler.
596 static void fc_seq_set_resp(struct fc_seq
*sp
,
597 void (*resp
)(struct fc_seq
*, struct fc_frame
*,
601 struct fc_exch
*ep
= fc_seq_exch(sp
);
604 spin_lock_bh(&ep
->ex_lock
);
605 while (ep
->resp_active
&& ep
->resp_task
!= current
) {
606 prepare_to_wait(&ep
->resp_wq
, &wait
, TASK_UNINTERRUPTIBLE
);
607 spin_unlock_bh(&ep
->ex_lock
);
611 spin_lock_bh(&ep
->ex_lock
);
613 finish_wait(&ep
->resp_wq
, &wait
);
616 spin_unlock_bh(&ep
->ex_lock
);
620 * fc_exch_abort_locked() - Abort an exchange
621 * @ep: The exchange to be aborted
622 * @timer_msec: The period of time to wait before aborting
624 * Locking notes: Called with exch lock held
626 * Return value: 0 on success else error code
628 static int fc_exch_abort_locked(struct fc_exch
*ep
,
629 unsigned int timer_msec
)
635 if (ep
->esb_stat
& (ESB_ST_COMPLETE
| ESB_ST_ABNORMAL
) ||
636 ep
->state
& (FC_EX_DONE
| FC_EX_RST_CLEANUP
))
640 * Send the abort on a new sequence if possible.
642 sp
= fc_seq_start_next_locked(&ep
->seq
);
647 fc_exch_timer_set_locked(ep
, timer_msec
);
651 * Send an abort for the sequence that timed out.
653 fp
= fc_frame_alloc(ep
->lp
, 0);
655 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
656 fc_fill_fc_hdr(fp
, FC_RCTL_BA_ABTS
, ep
->did
, ep
->sid
,
657 FC_TYPE_BLS
, FC_FC_END_SEQ
|
659 error
= fc_seq_send_locked(ep
->lp
, sp
, fp
);
665 * If not logged into the fabric, don't send ABTS but leave
666 * sequence active until next timeout.
670 ep
->esb_stat
|= ESB_ST_ABNORMAL
;
675 * fc_seq_exch_abort() - Abort an exchange and sequence
676 * @req_sp: The sequence to be aborted
677 * @timer_msec: The period of time to wait before aborting
679 * Generally called because of a timeout or an abort from the upper layer.
681 * Return value: 0 on success else error code
683 static int fc_seq_exch_abort(const struct fc_seq
*req_sp
,
684 unsigned int timer_msec
)
689 ep
= fc_seq_exch(req_sp
);
690 spin_lock_bh(&ep
->ex_lock
);
691 error
= fc_exch_abort_locked(ep
, timer_msec
);
692 spin_unlock_bh(&ep
->ex_lock
);
697 * fc_invoke_resp() - invoke ep->resp()
700 * It is assumed that after initialization finished (this means the
701 * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are
702 * modified only via fc_seq_set_resp(). This guarantees that none of these
703 * two variables changes if ep->resp_active > 0.
705 * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when
706 * this function is invoked, the first spin_lock_bh() call in this function
707 * will wait until fc_seq_set_resp() has finished modifying these variables.
709 * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that
710 * ep->resp() won't be invoked after fc_exch_done() has returned.
712 * The response handler itself may invoke fc_exch_done(), which will clear the
716 * Returns true if and only if ep->resp has been invoked.
718 static bool fc_invoke_resp(struct fc_exch
*ep
, struct fc_seq
*sp
,
721 void (*resp
)(struct fc_seq
*, struct fc_frame
*fp
, void *arg
);
725 spin_lock_bh(&ep
->ex_lock
);
727 if (ep
->resp_task
!= current
)
728 ep
->resp_task
= !ep
->resp_task
? current
: NULL
;
731 spin_unlock_bh(&ep
->ex_lock
);
738 spin_lock_bh(&ep
->ex_lock
);
739 if (--ep
->resp_active
== 0)
740 ep
->resp_task
= NULL
;
741 spin_unlock_bh(&ep
->ex_lock
);
743 if (ep
->resp_active
== 0)
744 wake_up(&ep
->resp_wq
);
750 * fc_exch_timeout() - Handle exchange timer expiration
751 * @work: The work_struct identifying the exchange that timed out
753 static void fc_exch_timeout(struct work_struct
*work
)
755 struct fc_exch
*ep
= container_of(work
, struct fc_exch
,
757 struct fc_seq
*sp
= &ep
->seq
;
761 FC_EXCH_DBG(ep
, "Exchange timed out\n");
763 spin_lock_bh(&ep
->ex_lock
);
764 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
))
767 e_stat
= ep
->esb_stat
;
768 if (e_stat
& ESB_ST_COMPLETE
) {
769 ep
->esb_stat
= e_stat
& ~ESB_ST_REC_QUAL
;
770 spin_unlock_bh(&ep
->ex_lock
);
771 if (e_stat
& ESB_ST_REC_QUAL
)
775 if (e_stat
& ESB_ST_ABNORMAL
)
776 rc
= fc_exch_done_locked(ep
);
777 spin_unlock_bh(&ep
->ex_lock
);
780 fc_invoke_resp(ep
, sp
, ERR_PTR(-FC_EX_TIMEOUT
));
781 fc_seq_set_resp(sp
, NULL
, ep
->arg
);
782 fc_seq_exch_abort(sp
, 2 * ep
->r_a_tov
);
786 spin_unlock_bh(&ep
->ex_lock
);
789 * This release matches the hold taken when the timer was set.
795 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
796 * @lport: The local port that the exchange is for
797 * @mp: The exchange manager that will allocate the exchange
799 * Returns pointer to allocated fc_exch with exch lock held.
801 static struct fc_exch
*fc_exch_em_alloc(struct fc_lport
*lport
,
802 struct fc_exch_mgr
*mp
)
807 struct fc_exch_pool
*pool
;
809 /* allocate memory for exchange */
810 ep
= mempool_alloc(mp
->ep_pool
, GFP_ATOMIC
);
812 atomic_inc(&mp
->stats
.no_free_exch
);
815 memset(ep
, 0, sizeof(*ep
));
818 pool
= per_cpu_ptr(mp
->pool
, cpu
);
819 spin_lock_bh(&pool
->lock
);
822 /* peek cache of free slot */
823 if (pool
->left
!= FC_XID_UNKNOWN
) {
825 pool
->left
= FC_XID_UNKNOWN
;
828 if (pool
->right
!= FC_XID_UNKNOWN
) {
830 pool
->right
= FC_XID_UNKNOWN
;
834 index
= pool
->next_index
;
835 /* allocate new exch from pool */
836 while (fc_exch_ptr_get(pool
, index
)) {
837 index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
838 if (index
== pool
->next_index
)
841 pool
->next_index
= index
== mp
->pool_max_index
? 0 : index
+ 1;
843 fc_exch_hold(ep
); /* hold for exch in mp */
844 spin_lock_init(&ep
->ex_lock
);
846 * Hold exch lock for caller to prevent fc_exch_reset()
847 * from releasing exch while fc_exch_alloc() caller is
848 * still working on exch.
850 spin_lock_bh(&ep
->ex_lock
);
852 fc_exch_ptr_set(pool
, index
, ep
);
853 list_add_tail(&ep
->ex_list
, &pool
->ex_list
);
854 fc_seq_alloc(ep
, ep
->seq_id
++);
855 pool
->total_exches
++;
856 spin_unlock_bh(&pool
->lock
);
861 ep
->oxid
= ep
->xid
= (index
<< fc_cpu_order
| cpu
) + mp
->min_xid
;
865 ep
->f_ctl
= FC_FC_FIRST_SEQ
; /* next seq is first seq */
866 ep
->rxid
= FC_XID_UNKNOWN
;
867 ep
->class = mp
->class;
869 init_waitqueue_head(&ep
->resp_wq
);
870 INIT_DELAYED_WORK(&ep
->timeout_work
, fc_exch_timeout
);
874 spin_unlock_bh(&pool
->lock
);
875 atomic_inc(&mp
->stats
.no_free_exch_xid
);
876 mempool_free(ep
, mp
->ep_pool
);
881 * fc_exch_alloc() - Allocate an exchange from an EM on a
882 * local port's list of EMs.
883 * @lport: The local port that will own the exchange
884 * @fp: The FC frame that the exchange will be for
886 * This function walks the list of exchange manager(EM)
887 * anchors to select an EM for a new exchange allocation. The
888 * EM is selected when a NULL match function pointer is encountered
889 * or when a call to a match function returns true.
891 static inline struct fc_exch
*fc_exch_alloc(struct fc_lport
*lport
,
894 struct fc_exch_mgr_anchor
*ema
;
896 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
897 if (!ema
->match
|| ema
->match(fp
))
898 return fc_exch_em_alloc(lport
, ema
->mp
);
903 * fc_exch_find() - Lookup and hold an exchange
904 * @mp: The exchange manager to lookup the exchange from
905 * @xid: The XID of the exchange to look up
907 static struct fc_exch
*fc_exch_find(struct fc_exch_mgr
*mp
, u16 xid
)
909 struct fc_exch_pool
*pool
;
910 struct fc_exch
*ep
= NULL
;
911 u16 cpu
= xid
& fc_cpu_mask
;
913 if (cpu
>= nr_cpu_ids
|| !cpu_possible(cpu
)) {
914 printk_ratelimited(KERN_ERR
915 "libfc: lookup request for XID = %d, "
916 "indicates invalid CPU %d\n", xid
, cpu
);
920 if ((xid
>= mp
->min_xid
) && (xid
<= mp
->max_xid
)) {
921 pool
= per_cpu_ptr(mp
->pool
, cpu
);
922 spin_lock_bh(&pool
->lock
);
923 ep
= fc_exch_ptr_get(pool
, (xid
- mp
->min_xid
) >> fc_cpu_order
);
925 WARN_ON(ep
->xid
!= xid
);
928 spin_unlock_bh(&pool
->lock
);
935 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
936 * the memory allocated for the related objects may be freed.
937 * @sp: The sequence that has completed
939 * Note: May sleep if invoked from outside a response handler.
941 static void fc_exch_done(struct fc_seq
*sp
)
943 struct fc_exch
*ep
= fc_seq_exch(sp
);
946 spin_lock_bh(&ep
->ex_lock
);
947 rc
= fc_exch_done_locked(ep
);
948 spin_unlock_bh(&ep
->ex_lock
);
950 fc_seq_set_resp(sp
, NULL
, ep
->arg
);
956 * fc_exch_resp() - Allocate a new exchange for a response frame
957 * @lport: The local port that the exchange was for
958 * @mp: The exchange manager to allocate the exchange from
959 * @fp: The response frame
961 * Sets the responder ID in the frame header.
963 static struct fc_exch
*fc_exch_resp(struct fc_lport
*lport
,
964 struct fc_exch_mgr
*mp
,
968 struct fc_frame_header
*fh
;
970 ep
= fc_exch_alloc(lport
, fp
);
972 ep
->class = fc_frame_class(fp
);
975 * Set EX_CTX indicating we're responding on this exchange.
977 ep
->f_ctl
|= FC_FC_EX_CTX
; /* we're responding */
978 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not new */
979 fh
= fc_frame_header_get(fp
);
980 ep
->sid
= ntoh24(fh
->fh_d_id
);
981 ep
->did
= ntoh24(fh
->fh_s_id
);
985 * Allocated exchange has placed the XID in the
986 * originator field. Move it to the responder field,
987 * and set the originator XID from the frame.
990 ep
->oxid
= ntohs(fh
->fh_ox_id
);
991 ep
->esb_stat
|= ESB_ST_RESP
| ESB_ST_SEQ_INIT
;
992 if ((ntoh24(fh
->fh_f_ctl
) & FC_FC_SEQ_INIT
) == 0)
993 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
995 fc_exch_hold(ep
); /* hold for caller */
996 spin_unlock_bh(&ep
->ex_lock
); /* lock from fc_exch_alloc */
1002 * fc_seq_lookup_recip() - Find a sequence where the other end
1003 * originated the sequence
1004 * @lport: The local port that the frame was sent to
1005 * @mp: The Exchange Manager to lookup the exchange from
1006 * @fp: The frame associated with the sequence we're looking for
1008 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
1009 * on the ep that should be released by the caller.
1011 static enum fc_pf_rjt_reason
fc_seq_lookup_recip(struct fc_lport
*lport
,
1012 struct fc_exch_mgr
*mp
,
1013 struct fc_frame
*fp
)
1015 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1016 struct fc_exch
*ep
= NULL
;
1017 struct fc_seq
*sp
= NULL
;
1018 enum fc_pf_rjt_reason reject
= FC_RJT_NONE
;
1022 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1023 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != 0);
1026 * Lookup or create the exchange if we will be creating the sequence.
1028 if (f_ctl
& FC_FC_EX_CTX
) {
1029 xid
= ntohs(fh
->fh_ox_id
); /* we originated exch */
1030 ep
= fc_exch_find(mp
, xid
);
1032 atomic_inc(&mp
->stats
.xid_not_found
);
1033 reject
= FC_RJT_OX_ID
;
1036 if (ep
->rxid
== FC_XID_UNKNOWN
)
1037 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1038 else if (ep
->rxid
!= ntohs(fh
->fh_rx_id
)) {
1039 reject
= FC_RJT_OX_ID
;
1043 xid
= ntohs(fh
->fh_rx_id
); /* we are the responder */
1046 * Special case for MDS issuing an ELS TEST with a
1048 * XXX take this out once we do the proper reject.
1050 if (xid
== 0 && fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
&&
1051 fc_frame_payload_op(fp
) == ELS_TEST
) {
1052 fh
->fh_rx_id
= htons(FC_XID_UNKNOWN
);
1053 xid
= FC_XID_UNKNOWN
;
1057 * new sequence - find the exchange
1059 ep
= fc_exch_find(mp
, xid
);
1060 if ((f_ctl
& FC_FC_FIRST_SEQ
) && fc_sof_is_init(fr_sof(fp
))) {
1062 atomic_inc(&mp
->stats
.xid_busy
);
1063 reject
= FC_RJT_RX_ID
;
1066 ep
= fc_exch_resp(lport
, mp
, fp
);
1068 reject
= FC_RJT_EXCH_EST
; /* XXX */
1071 xid
= ep
->xid
; /* get our XID */
1073 atomic_inc(&mp
->stats
.xid_not_found
);
1074 reject
= FC_RJT_RX_ID
; /* XID not found */
1079 spin_lock_bh(&ep
->ex_lock
);
1081 * At this point, we have the exchange held.
1082 * Find or create the sequence.
1084 if (fc_sof_is_init(fr_sof(fp
))) {
1086 sp
->ssb_stat
|= SSB_ST_RESP
;
1087 sp
->id
= fh
->fh_seq_id
;
1090 if (sp
->id
!= fh
->fh_seq_id
) {
1091 atomic_inc(&mp
->stats
.seq_not_found
);
1092 if (f_ctl
& FC_FC_END_SEQ
) {
1094 * Update sequence_id based on incoming last
1095 * frame of sequence exchange. This is needed
1096 * for FC target where DDP has been used
1097 * on target where, stack is indicated only
1098 * about last frame's (payload _header) header.
1099 * Whereas "seq_id" which is part of
1100 * frame_header is allocated by initiator
1101 * which is totally different from "seq_id"
1102 * allocated when XFER_RDY was sent by target.
1103 * To avoid false -ve which results into not
1104 * sending RSP, hence write request on other
1105 * end never finishes.
1107 sp
->ssb_stat
|= SSB_ST_RESP
;
1108 sp
->id
= fh
->fh_seq_id
;
1110 spin_unlock_bh(&ep
->ex_lock
);
1112 /* sequence/exch should exist */
1113 reject
= FC_RJT_SEQ_ID
;
1118 WARN_ON(ep
!= fc_seq_exch(sp
));
1120 if (f_ctl
& FC_FC_SEQ_INIT
)
1121 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1122 spin_unlock_bh(&ep
->ex_lock
);
1128 fc_exch_done(&ep
->seq
);
1129 fc_exch_release(ep
); /* hold from fc_exch_find/fc_exch_resp */
1134 * fc_seq_lookup_orig() - Find a sequence where this end
1135 * originated the sequence
1136 * @mp: The Exchange Manager to lookup the exchange from
1137 * @fp: The frame associated with the sequence we're looking for
1139 * Does not hold the sequence for the caller.
1141 static struct fc_seq
*fc_seq_lookup_orig(struct fc_exch_mgr
*mp
,
1142 struct fc_frame
*fp
)
1144 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1146 struct fc_seq
*sp
= NULL
;
1150 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1151 WARN_ON((f_ctl
& FC_FC_SEQ_CTX
) != FC_FC_SEQ_CTX
);
1152 xid
= ntohs((f_ctl
& FC_FC_EX_CTX
) ? fh
->fh_ox_id
: fh
->fh_rx_id
);
1153 ep
= fc_exch_find(mp
, xid
);
1156 if (ep
->seq
.id
== fh
->fh_seq_id
) {
1158 * Save the RX_ID if we didn't previously know it.
1161 if ((f_ctl
& FC_FC_EX_CTX
) != 0 &&
1162 ep
->rxid
== FC_XID_UNKNOWN
) {
1163 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1166 fc_exch_release(ep
);
1171 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
1172 * @ep: The exchange to set the addresses for
1173 * @orig_id: The originator's ID
1174 * @resp_id: The responder's ID
1176 * Note this must be done before the first sequence of the exchange is sent.
1178 static void fc_exch_set_addr(struct fc_exch
*ep
,
1179 u32 orig_id
, u32 resp_id
)
1182 if (ep
->esb_stat
& ESB_ST_RESP
) {
1192 * fc_seq_els_rsp_send() - Send an ELS response using information from
1193 * the existing sequence/exchange.
1194 * @fp: The received frame
1195 * @els_cmd: The ELS command to be sent
1196 * @els_data: The ELS data to be sent
1198 * The received frame is not freed.
1200 static void fc_seq_els_rsp_send(struct fc_frame
*fp
, enum fc_els_cmd els_cmd
,
1201 struct fc_seq_els_data
*els_data
)
1205 fc_seq_ls_rjt(fp
, els_data
->reason
, els_data
->explan
);
1211 fc_exch_els_rrq(fp
);
1214 fc_exch_els_rec(fp
);
1217 FC_LPORT_DBG(fr_dev(fp
), "Invalid ELS CMD:%x\n", els_cmd
);
1222 * fc_seq_send_last() - Send a sequence that is the last in the exchange
1223 * @sp: The sequence that is to be sent
1224 * @fp: The frame that will be sent on the sequence
1225 * @rctl: The R_CTL information to be sent
1226 * @fh_type: The frame header type
1228 static void fc_seq_send_last(struct fc_seq
*sp
, struct fc_frame
*fp
,
1229 enum fc_rctl rctl
, enum fc_fh_type fh_type
)
1232 struct fc_exch
*ep
= fc_seq_exch(sp
);
1234 f_ctl
= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
;
1236 fc_fill_fc_hdr(fp
, rctl
, ep
->did
, ep
->sid
, fh_type
, f_ctl
, 0);
1237 fc_seq_send_locked(ep
->lp
, sp
, fp
);
1241 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
1242 * @sp: The sequence to send the ACK on
1243 * @rx_fp: The received frame that is being acknoledged
1245 * Send ACK_1 (or equiv.) indicating we received something.
1247 static void fc_seq_send_ack(struct fc_seq
*sp
, const struct fc_frame
*rx_fp
)
1249 struct fc_frame
*fp
;
1250 struct fc_frame_header
*rx_fh
;
1251 struct fc_frame_header
*fh
;
1252 struct fc_exch
*ep
= fc_seq_exch(sp
);
1253 struct fc_lport
*lport
= ep
->lp
;
1257 * Don't send ACKs for class 3.
1259 if (fc_sof_needs_ack(fr_sof(rx_fp
))) {
1260 fp
= fc_frame_alloc(lport
, 0);
1264 fh
= fc_frame_header_get(fp
);
1265 fh
->fh_r_ctl
= FC_RCTL_ACK_1
;
1266 fh
->fh_type
= FC_TYPE_BLS
;
1269 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1270 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1271 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1272 * Last ACK uses bits 7-6 (continue sequence),
1273 * bits 5-4 are meaningful (what kind of ACK to use).
1275 rx_fh
= fc_frame_header_get(rx_fp
);
1276 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1277 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1278 FC_FC_FIRST_SEQ
| FC_FC_LAST_SEQ
|
1279 FC_FC_END_SEQ
| FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1280 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1281 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1282 hton24(fh
->fh_f_ctl
, f_ctl
);
1284 fc_exch_setup_hdr(ep
, fp
, f_ctl
);
1285 fh
->fh_seq_id
= rx_fh
->fh_seq_id
;
1286 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1287 fh
->fh_parm_offset
= htonl(1); /* ack single frame */
1289 fr_sof(fp
) = fr_sof(rx_fp
);
1290 if (f_ctl
& FC_FC_END_SEQ
)
1291 fr_eof(fp
) = FC_EOF_T
;
1293 fr_eof(fp
) = FC_EOF_N
;
1295 lport
->tt
.frame_send(lport
, fp
);
1300 * fc_exch_send_ba_rjt() - Send BLS Reject
1301 * @rx_fp: The frame being rejected
1302 * @reason: The reason the frame is being rejected
1303 * @explan: The explanation for the rejection
1305 * This is for rejecting BA_ABTS only.
1307 static void fc_exch_send_ba_rjt(struct fc_frame
*rx_fp
,
1308 enum fc_ba_rjt_reason reason
,
1309 enum fc_ba_rjt_explan explan
)
1311 struct fc_frame
*fp
;
1312 struct fc_frame_header
*rx_fh
;
1313 struct fc_frame_header
*fh
;
1314 struct fc_ba_rjt
*rp
;
1315 struct fc_lport
*lport
;
1318 lport
= fr_dev(rx_fp
);
1319 fp
= fc_frame_alloc(lport
, sizeof(*rp
));
1322 fh
= fc_frame_header_get(fp
);
1323 rx_fh
= fc_frame_header_get(rx_fp
);
1325 memset(fh
, 0, sizeof(*fh
) + sizeof(*rp
));
1327 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
1328 rp
->br_reason
= reason
;
1329 rp
->br_explan
= explan
;
1332 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1334 memcpy(fh
->fh_s_id
, rx_fh
->fh_d_id
, 3);
1335 memcpy(fh
->fh_d_id
, rx_fh
->fh_s_id
, 3);
1336 fh
->fh_ox_id
= rx_fh
->fh_ox_id
;
1337 fh
->fh_rx_id
= rx_fh
->fh_rx_id
;
1338 fh
->fh_seq_cnt
= rx_fh
->fh_seq_cnt
;
1339 fh
->fh_r_ctl
= FC_RCTL_BA_RJT
;
1340 fh
->fh_type
= FC_TYPE_BLS
;
1343 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1344 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1345 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1346 * Last ACK uses bits 7-6 (continue sequence),
1347 * bits 5-4 are meaningful (what kind of ACK to use).
1348 * Always set LAST_SEQ, END_SEQ.
1350 f_ctl
= ntoh24(rx_fh
->fh_f_ctl
);
1351 f_ctl
&= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
|
1352 FC_FC_END_CONN
| FC_FC_SEQ_INIT
|
1353 FC_FC_RETX_SEQ
| FC_FC_UNI_TX
;
1354 f_ctl
^= FC_FC_EX_CTX
| FC_FC_SEQ_CTX
;
1355 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
1356 f_ctl
&= ~FC_FC_FIRST_SEQ
;
1357 hton24(fh
->fh_f_ctl
, f_ctl
);
1359 fr_sof(fp
) = fc_sof_class(fr_sof(rx_fp
));
1360 fr_eof(fp
) = FC_EOF_T
;
1361 if (fc_sof_needs_ack(fr_sof(fp
)))
1362 fr_eof(fp
) = FC_EOF_N
;
1364 lport
->tt
.frame_send(lport
, fp
);
1368 * fc_exch_recv_abts() - Handle an incoming ABTS
1369 * @ep: The exchange the abort was on
1370 * @rx_fp: The ABTS frame
1372 * This would be for target mode usually, but could be due to lost
1373 * FCP transfer ready, confirm or RRQ. We always handle this as an
1374 * exchange abort, ignoring the parameter.
1376 static void fc_exch_recv_abts(struct fc_exch
*ep
, struct fc_frame
*rx_fp
)
1378 struct fc_frame
*fp
;
1379 struct fc_ba_acc
*ap
;
1380 struct fc_frame_header
*fh
;
1386 fp
= fc_frame_alloc(ep
->lp
, sizeof(*ap
));
1390 spin_lock_bh(&ep
->ex_lock
);
1391 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1392 spin_unlock_bh(&ep
->ex_lock
);
1397 if (!(ep
->esb_stat
& ESB_ST_REC_QUAL
)) {
1398 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1399 fc_exch_hold(ep
); /* hold for REC_QUAL */
1401 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
1402 fh
= fc_frame_header_get(fp
);
1403 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1404 memset(ap
, 0, sizeof(*ap
));
1406 ap
->ba_high_seq_cnt
= htons(0xffff);
1407 if (sp
->ssb_stat
& SSB_ST_RESP
) {
1408 ap
->ba_seq_id
= sp
->id
;
1409 ap
->ba_seq_id_val
= FC_BA_SEQ_ID_VAL
;
1410 ap
->ba_high_seq_cnt
= fh
->fh_seq_cnt
;
1411 ap
->ba_low_seq_cnt
= htons(sp
->cnt
);
1413 sp
= fc_seq_start_next_locked(sp
);
1414 fc_seq_send_last(sp
, fp
, FC_RCTL_BA_ACC
, FC_TYPE_BLS
);
1415 ep
->esb_stat
|= ESB_ST_ABNORMAL
;
1416 spin_unlock_bh(&ep
->ex_lock
);
1419 fc_frame_free(rx_fp
);
1423 fc_exch_send_ba_rjt(rx_fp
, FC_BA_RJT_UNABLE
, FC_BA_RJT_INV_XID
);
1428 * fc_seq_assign() - Assign exchange and sequence for incoming request
1429 * @lport: The local port that received the request
1430 * @fp: The request frame
1432 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
1433 * A reference will be held on the exchange/sequence for the caller, which
1434 * must call fc_seq_release().
1436 static struct fc_seq
*fc_seq_assign(struct fc_lport
*lport
, struct fc_frame
*fp
)
1438 struct fc_exch_mgr_anchor
*ema
;
1440 WARN_ON(lport
!= fr_dev(fp
));
1441 WARN_ON(fr_seq(fp
));
1444 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1445 if ((!ema
->match
|| ema
->match(fp
)) &&
1446 fc_seq_lookup_recip(lport
, ema
->mp
, fp
) == FC_RJT_NONE
)
1452 * fc_seq_release() - Release the hold
1453 * @sp: The sequence.
1455 static void fc_seq_release(struct fc_seq
*sp
)
1457 fc_exch_release(fc_seq_exch(sp
));
1461 * fc_exch_recv_req() - Handler for an incoming request
1462 * @lport: The local port that received the request
1463 * @mp: The EM that the exchange is on
1464 * @fp: The request frame
1466 * This is used when the other end is originating the exchange
1469 static void fc_exch_recv_req(struct fc_lport
*lport
, struct fc_exch_mgr
*mp
,
1470 struct fc_frame
*fp
)
1472 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1473 struct fc_seq
*sp
= NULL
;
1474 struct fc_exch
*ep
= NULL
;
1475 enum fc_pf_rjt_reason reject
;
1477 /* We can have the wrong fc_lport at this point with NPIV, which is a
1478 * problem now that we know a new exchange needs to be allocated
1480 lport
= fc_vport_id_lookup(lport
, ntoh24(fh
->fh_d_id
));
1487 BUG_ON(fr_seq(fp
)); /* XXX remove later */
1490 * If the RX_ID is 0xffff, don't allocate an exchange.
1491 * The upper-level protocol may request one later, if needed.
1493 if (fh
->fh_rx_id
== htons(FC_XID_UNKNOWN
))
1494 return lport
->tt
.lport_recv(lport
, fp
);
1496 reject
= fc_seq_lookup_recip(lport
, mp
, fp
);
1497 if (reject
== FC_RJT_NONE
) {
1498 sp
= fr_seq(fp
); /* sequence will be held */
1499 ep
= fc_seq_exch(sp
);
1500 fc_seq_send_ack(sp
, fp
);
1501 ep
->encaps
= fr_encaps(fp
);
1504 * Call the receive function.
1506 * The receive function may allocate a new sequence
1507 * over the old one, so we shouldn't change the
1508 * sequence after this.
1510 * The frame will be freed by the receive function.
1511 * If new exch resp handler is valid then call that
1514 if (!fc_invoke_resp(ep
, sp
, fp
))
1515 lport
->tt
.lport_recv(lport
, fp
);
1516 fc_exch_release(ep
); /* release from lookup */
1518 FC_LPORT_DBG(lport
, "exch/seq lookup failed: reject %x\n",
1525 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1526 * end is the originator of the sequence that is a
1527 * response to our initial exchange
1528 * @mp: The EM that the exchange is on
1529 * @fp: The response frame
1531 static void fc_exch_recv_seq_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1533 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
1540 ep
= fc_exch_find(mp
, ntohs(fh
->fh_ox_id
));
1542 atomic_inc(&mp
->stats
.xid_not_found
);
1545 if (ep
->esb_stat
& ESB_ST_COMPLETE
) {
1546 atomic_inc(&mp
->stats
.xid_not_found
);
1549 if (ep
->rxid
== FC_XID_UNKNOWN
)
1550 ep
->rxid
= ntohs(fh
->fh_rx_id
);
1551 if (ep
->sid
!= 0 && ep
->sid
!= ntoh24(fh
->fh_d_id
)) {
1552 atomic_inc(&mp
->stats
.xid_not_found
);
1555 if (ep
->did
!= ntoh24(fh
->fh_s_id
) &&
1556 ep
->did
!= FC_FID_FLOGI
) {
1557 atomic_inc(&mp
->stats
.xid_not_found
);
1562 if (fc_sof_is_init(sof
)) {
1563 sp
->ssb_stat
|= SSB_ST_RESP
;
1564 sp
->id
= fh
->fh_seq_id
;
1565 } else if (sp
->id
!= fh
->fh_seq_id
) {
1566 atomic_inc(&mp
->stats
.seq_not_found
);
1570 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1573 spin_lock_bh(&ep
->ex_lock
);
1574 if (f_ctl
& FC_FC_SEQ_INIT
)
1575 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1576 spin_unlock_bh(&ep
->ex_lock
);
1578 if (fc_sof_needs_ack(sof
))
1579 fc_seq_send_ack(sp
, fp
);
1581 if (fh
->fh_type
!= FC_TYPE_FCP
&& fr_eof(fp
) == FC_EOF_T
&&
1582 (f_ctl
& (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) ==
1583 (FC_FC_LAST_SEQ
| FC_FC_END_SEQ
)) {
1584 spin_lock_bh(&ep
->ex_lock
);
1585 rc
= fc_exch_done_locked(ep
);
1586 WARN_ON(fc_seq_exch(sp
) != ep
);
1587 spin_unlock_bh(&ep
->ex_lock
);
1593 * Call the receive function.
1594 * The sequence is held (has a refcnt) for us,
1595 * but not for the receive function.
1597 * The receive function may allocate a new sequence
1598 * over the old one, so we shouldn't change the
1599 * sequence after this.
1601 * The frame will be freed by the receive function.
1602 * If new exch resp handler is valid then call that
1605 if (!fc_invoke_resp(ep
, sp
, fp
))
1608 fc_exch_release(ep
);
1611 fc_exch_release(ep
);
1617 * fc_exch_recv_resp() - Handler for a sequence where other end is
1618 * responding to our sequence
1619 * @mp: The EM that the exchange is on
1620 * @fp: The response frame
1622 static void fc_exch_recv_resp(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1626 sp
= fc_seq_lookup_orig(mp
, fp
); /* doesn't hold sequence */
1629 atomic_inc(&mp
->stats
.xid_not_found
);
1631 atomic_inc(&mp
->stats
.non_bls_resp
);
1637 * fc_exch_abts_resp() - Handler for a response to an ABT
1638 * @ep: The exchange that the frame is on
1639 * @fp: The response frame
1641 * This response would be to an ABTS cancelling an exchange or sequence.
1642 * The response can be either BA_ACC or BA_RJT
1644 static void fc_exch_abts_resp(struct fc_exch
*ep
, struct fc_frame
*fp
)
1646 struct fc_frame_header
*fh
;
1647 struct fc_ba_acc
*ap
;
1651 int rc
= 1, has_rec
= 0;
1653 fh
= fc_frame_header_get(fp
);
1654 FC_EXCH_DBG(ep
, "exch: BLS rctl %x - %s\n", fh
->fh_r_ctl
,
1655 fc_exch_rctl_name(fh
->fh_r_ctl
));
1657 if (cancel_delayed_work_sync(&ep
->timeout_work
)) {
1658 FC_EXCH_DBG(ep
, "Exchange timer canceled due to ABTS response\n");
1659 fc_exch_release(ep
); /* release from pending timer hold */
1662 spin_lock_bh(&ep
->ex_lock
);
1663 switch (fh
->fh_r_ctl
) {
1664 case FC_RCTL_BA_ACC
:
1665 ap
= fc_frame_payload_get(fp
, sizeof(*ap
));
1670 * Decide whether to establish a Recovery Qualifier.
1671 * We do this if there is a non-empty SEQ_CNT range and
1672 * SEQ_ID is the same as the one we aborted.
1674 low
= ntohs(ap
->ba_low_seq_cnt
);
1675 high
= ntohs(ap
->ba_high_seq_cnt
);
1676 if ((ep
->esb_stat
& ESB_ST_REC_QUAL
) == 0 &&
1677 (ap
->ba_seq_id_val
!= FC_BA_SEQ_ID_VAL
||
1678 ap
->ba_seq_id
== ep
->seq_id
) && low
!= high
) {
1679 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
1680 fc_exch_hold(ep
); /* hold for recovery qualifier */
1684 case FC_RCTL_BA_RJT
:
1690 /* do we need to do some other checks here. Can we reuse more of
1691 * fc_exch_recv_seq_resp
1695 * do we want to check END_SEQ as well as LAST_SEQ here?
1697 if (ep
->fh_type
!= FC_TYPE_FCP
&&
1698 ntoh24(fh
->fh_f_ctl
) & FC_FC_LAST_SEQ
)
1699 rc
= fc_exch_done_locked(ep
);
1700 spin_unlock_bh(&ep
->ex_lock
);
1705 if (!fc_invoke_resp(ep
, sp
, fp
))
1708 fc_exch_timer_set(ep
, ep
->r_a_tov
);
1709 fc_exch_release(ep
);
1713 * fc_exch_recv_bls() - Handler for a BLS sequence
1714 * @mp: The EM that the exchange is on
1715 * @fp: The request frame
1717 * The BLS frame is always a sequence initiated by the remote side.
1718 * We may be either the originator or recipient of the exchange.
1720 static void fc_exch_recv_bls(struct fc_exch_mgr
*mp
, struct fc_frame
*fp
)
1722 struct fc_frame_header
*fh
;
1726 fh
= fc_frame_header_get(fp
);
1727 f_ctl
= ntoh24(fh
->fh_f_ctl
);
1730 ep
= fc_exch_find(mp
, (f_ctl
& FC_FC_EX_CTX
) ?
1731 ntohs(fh
->fh_ox_id
) : ntohs(fh
->fh_rx_id
));
1732 if (ep
&& (f_ctl
& FC_FC_SEQ_INIT
)) {
1733 spin_lock_bh(&ep
->ex_lock
);
1734 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
1735 spin_unlock_bh(&ep
->ex_lock
);
1737 if (f_ctl
& FC_FC_SEQ_CTX
) {
1739 * A response to a sequence we initiated.
1740 * This should only be ACKs for class 2 or F.
1742 switch (fh
->fh_r_ctl
) {
1748 FC_EXCH_DBG(ep
, "BLS rctl %x - %s received\n",
1750 fc_exch_rctl_name(fh
->fh_r_ctl
));
1755 switch (fh
->fh_r_ctl
) {
1756 case FC_RCTL_BA_RJT
:
1757 case FC_RCTL_BA_ACC
:
1759 fc_exch_abts_resp(ep
, fp
);
1763 case FC_RCTL_BA_ABTS
:
1764 fc_exch_recv_abts(ep
, fp
);
1766 default: /* ignore junk */
1772 fc_exch_release(ep
); /* release hold taken by fc_exch_find */
1776 * fc_seq_ls_acc() - Accept sequence with LS_ACC
1777 * @rx_fp: The received frame, not freed here.
1779 * If this fails due to allocation or transmit congestion, assume the
1780 * originator will repeat the sequence.
1782 static void fc_seq_ls_acc(struct fc_frame
*rx_fp
)
1784 struct fc_lport
*lport
;
1785 struct fc_els_ls_acc
*acc
;
1786 struct fc_frame
*fp
;
1788 lport
= fr_dev(rx_fp
);
1789 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1792 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1793 memset(acc
, 0, sizeof(*acc
));
1794 acc
->la_cmd
= ELS_LS_ACC
;
1795 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1796 lport
->tt
.frame_send(lport
, fp
);
1800 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
1801 * @rx_fp: The received frame, not freed here.
1802 * @reason: The reason the sequence is being rejected
1803 * @explan: The explanation for the rejection
1805 * If this fails due to allocation or transmit congestion, assume the
1806 * originator will repeat the sequence.
1808 static void fc_seq_ls_rjt(struct fc_frame
*rx_fp
, enum fc_els_rjt_reason reason
,
1809 enum fc_els_rjt_explan explan
)
1811 struct fc_lport
*lport
;
1812 struct fc_els_ls_rjt
*rjt
;
1813 struct fc_frame
*fp
;
1815 lport
= fr_dev(rx_fp
);
1816 fp
= fc_frame_alloc(lport
, sizeof(*rjt
));
1819 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1820 memset(rjt
, 0, sizeof(*rjt
));
1821 rjt
->er_cmd
= ELS_LS_RJT
;
1822 rjt
->er_reason
= reason
;
1823 rjt
->er_explan
= explan
;
1824 fc_fill_reply_hdr(fp
, rx_fp
, FC_RCTL_ELS_REP
, 0);
1825 lport
->tt
.frame_send(lport
, fp
);
1829 * fc_exch_reset() - Reset an exchange
1830 * @ep: The exchange to be reset
1832 * Note: May sleep if invoked from outside a response handler.
1834 static void fc_exch_reset(struct fc_exch
*ep
)
1839 spin_lock_bh(&ep
->ex_lock
);
1840 fc_exch_abort_locked(ep
, 0);
1841 ep
->state
|= FC_EX_RST_CLEANUP
;
1842 fc_exch_timer_cancel(ep
);
1843 if (ep
->esb_stat
& ESB_ST_REC_QUAL
)
1844 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec_qual */
1845 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
1847 rc
= fc_exch_done_locked(ep
);
1848 spin_unlock_bh(&ep
->ex_lock
);
1855 fc_invoke_resp(ep
, sp
, ERR_PTR(-FC_EX_CLOSED
));
1856 fc_seq_set_resp(sp
, NULL
, ep
->arg
);
1857 fc_exch_release(ep
);
1861 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1862 * @lport: The local port that the exchange pool is on
1863 * @pool: The exchange pool to be reset
1864 * @sid: The source ID
1865 * @did: The destination ID
1867 * Resets a per cpu exches pool, releasing all of its sequences
1868 * and exchanges. If sid is non-zero then reset only exchanges
1869 * we sourced from the local port's FID. If did is non-zero then
1870 * only reset exchanges destined for the local port's FID.
1872 static void fc_exch_pool_reset(struct fc_lport
*lport
,
1873 struct fc_exch_pool
*pool
,
1877 struct fc_exch
*next
;
1879 spin_lock_bh(&pool
->lock
);
1881 list_for_each_entry_safe(ep
, next
, &pool
->ex_list
, ex_list
) {
1882 if ((lport
== ep
->lp
) &&
1883 (sid
== 0 || sid
== ep
->sid
) &&
1884 (did
== 0 || did
== ep
->did
)) {
1886 spin_unlock_bh(&pool
->lock
);
1890 fc_exch_release(ep
);
1891 spin_lock_bh(&pool
->lock
);
1894 * must restart loop incase while lock
1895 * was down multiple eps were released.
1900 pool
->next_index
= 0;
1901 pool
->left
= FC_XID_UNKNOWN
;
1902 pool
->right
= FC_XID_UNKNOWN
;
1903 spin_unlock_bh(&pool
->lock
);
1907 * fc_exch_mgr_reset() - Reset all EMs of a local port
1908 * @lport: The local port whose EMs are to be reset
1909 * @sid: The source ID
1910 * @did: The destination ID
1912 * Reset all EMs associated with a given local port. Release all
1913 * sequences and exchanges. If sid is non-zero then reset only the
1914 * exchanges sent from the local port's FID. If did is non-zero then
1915 * reset only exchanges destined for the local port's FID.
1917 void fc_exch_mgr_reset(struct fc_lport
*lport
, u32 sid
, u32 did
)
1919 struct fc_exch_mgr_anchor
*ema
;
1922 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
1923 for_each_possible_cpu(cpu
)
1924 fc_exch_pool_reset(lport
,
1925 per_cpu_ptr(ema
->mp
->pool
, cpu
),
1929 EXPORT_SYMBOL(fc_exch_mgr_reset
);
1932 * fc_exch_lookup() - find an exchange
1933 * @lport: The local port
1934 * @xid: The exchange ID
1936 * Returns exchange pointer with hold for caller, or NULL if not found.
1938 static struct fc_exch
*fc_exch_lookup(struct fc_lport
*lport
, u32 xid
)
1940 struct fc_exch_mgr_anchor
*ema
;
1942 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
)
1943 if (ema
->mp
->min_xid
<= xid
&& xid
<= ema
->mp
->max_xid
)
1944 return fc_exch_find(ema
->mp
, xid
);
1949 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
1950 * @rfp: The REC frame, not freed here.
1952 * Note that the requesting port may be different than the S_ID in the request.
1954 static void fc_exch_els_rec(struct fc_frame
*rfp
)
1956 struct fc_lport
*lport
;
1957 struct fc_frame
*fp
;
1959 struct fc_els_rec
*rp
;
1960 struct fc_els_rec_acc
*acc
;
1961 enum fc_els_rjt_reason reason
= ELS_RJT_LOGIC
;
1962 enum fc_els_rjt_explan explan
;
1967 lport
= fr_dev(rfp
);
1968 rp
= fc_frame_payload_get(rfp
, sizeof(*rp
));
1969 explan
= ELS_EXPL_INV_LEN
;
1972 sid
= ntoh24(rp
->rec_s_id
);
1973 rxid
= ntohs(rp
->rec_rx_id
);
1974 oxid
= ntohs(rp
->rec_ox_id
);
1976 ep
= fc_exch_lookup(lport
,
1977 sid
== fc_host_port_id(lport
->host
) ? oxid
: rxid
);
1978 explan
= ELS_EXPL_OXID_RXID
;
1981 if (ep
->oid
!= sid
|| oxid
!= ep
->oxid
)
1983 if (rxid
!= FC_XID_UNKNOWN
&& rxid
!= ep
->rxid
)
1985 fp
= fc_frame_alloc(lport
, sizeof(*acc
));
1989 acc
= fc_frame_payload_get(fp
, sizeof(*acc
));
1990 memset(acc
, 0, sizeof(*acc
));
1991 acc
->reca_cmd
= ELS_LS_ACC
;
1992 acc
->reca_ox_id
= rp
->rec_ox_id
;
1993 memcpy(acc
->reca_ofid
, rp
->rec_s_id
, 3);
1994 acc
->reca_rx_id
= htons(ep
->rxid
);
1995 if (ep
->sid
== ep
->oid
)
1996 hton24(acc
->reca_rfid
, ep
->did
);
1998 hton24(acc
->reca_rfid
, ep
->sid
);
1999 acc
->reca_fc4value
= htonl(ep
->seq
.rec_data
);
2000 acc
->reca_e_stat
= htonl(ep
->esb_stat
& (ESB_ST_RESP
|
2003 fc_fill_reply_hdr(fp
, rfp
, FC_RCTL_ELS_REP
, 0);
2004 lport
->tt
.frame_send(lport
, fp
);
2006 fc_exch_release(ep
);
2010 fc_exch_release(ep
);
2012 fc_seq_ls_rjt(rfp
, reason
, explan
);
2016 * fc_exch_rrq_resp() - Handler for RRQ responses
2017 * @sp: The sequence that the RRQ is on
2018 * @fp: The RRQ frame
2019 * @arg: The exchange that the RRQ is on
2021 * TODO: fix error handler.
2023 static void fc_exch_rrq_resp(struct fc_seq
*sp
, struct fc_frame
*fp
, void *arg
)
2025 struct fc_exch
*aborted_ep
= arg
;
2029 int err
= PTR_ERR(fp
);
2031 if (err
== -FC_EX_CLOSED
|| err
== -FC_EX_TIMEOUT
)
2033 FC_EXCH_DBG(aborted_ep
, "Cannot process RRQ, "
2034 "frame error %d\n", err
);
2038 op
= fc_frame_payload_op(fp
);
2043 FC_EXCH_DBG(aborted_ep
, "LS_RJT for RRQ\n");
2048 FC_EXCH_DBG(aborted_ep
, "unexpected response op %x for RRQ\n",
2054 fc_exch_done(&aborted_ep
->seq
);
2055 /* drop hold for rec qual */
2056 fc_exch_release(aborted_ep
);
2061 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
2062 * @lport: The local port to send the frame on
2063 * @fp: The frame to be sent
2064 * @resp: The response handler for this request
2065 * @destructor: The destructor for the exchange
2066 * @arg: The argument to be passed to the response handler
2067 * @timer_msec: The timeout period for the exchange
2069 * The frame pointer with some of the header's fields must be
2070 * filled before calling this routine, those fields are:
2077 * - parameter or relative offset
2079 static struct fc_seq
*fc_exch_seq_send(struct fc_lport
*lport
,
2080 struct fc_frame
*fp
,
2081 void (*resp
)(struct fc_seq
*,
2082 struct fc_frame
*fp
,
2084 void (*destructor
)(struct fc_seq
*,
2086 void *arg
, u32 timer_msec
)
2089 struct fc_seq
*sp
= NULL
;
2090 struct fc_frame_header
*fh
;
2091 struct fc_fcp_pkt
*fsp
= NULL
;
2094 ep
= fc_exch_alloc(lport
, fp
);
2099 ep
->esb_stat
|= ESB_ST_SEQ_INIT
;
2100 fh
= fc_frame_header_get(fp
);
2101 fc_exch_set_addr(ep
, ntoh24(fh
->fh_s_id
), ntoh24(fh
->fh_d_id
));
2103 ep
->destructor
= destructor
;
2105 ep
->r_a_tov
= FC_DEF_R_A_TOV
;
2109 ep
->fh_type
= fh
->fh_type
; /* save for possbile timeout handling */
2110 ep
->f_ctl
= ntoh24(fh
->fh_f_ctl
);
2111 fc_exch_setup_hdr(ep
, fp
, ep
->f_ctl
);
2114 if (ep
->xid
<= lport
->lro_xid
&& fh
->fh_r_ctl
== FC_RCTL_DD_UNSOL_CMD
) {
2116 fc_fcp_ddp_setup(fr_fsp(fp
), ep
->xid
);
2119 if (unlikely(lport
->tt
.frame_send(lport
, fp
)))
2123 fc_exch_timer_set_locked(ep
, timer_msec
);
2124 ep
->f_ctl
&= ~FC_FC_FIRST_SEQ
; /* not first seq */
2126 if (ep
->f_ctl
& FC_FC_SEQ_INIT
)
2127 ep
->esb_stat
&= ~ESB_ST_SEQ_INIT
;
2128 spin_unlock_bh(&ep
->ex_lock
);
2132 fc_fcp_ddp_done(fsp
);
2133 rc
= fc_exch_done_locked(ep
);
2134 spin_unlock_bh(&ep
->ex_lock
);
2141 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
2142 * @ep: The exchange to send the RRQ on
2144 * This tells the remote port to stop blocking the use of
2145 * the exchange and the seq_cnt range.
2147 static void fc_exch_rrq(struct fc_exch
*ep
)
2149 struct fc_lport
*lport
;
2150 struct fc_els_rrq
*rrq
;
2151 struct fc_frame
*fp
;
2156 fp
= fc_frame_alloc(lport
, sizeof(*rrq
));
2160 rrq
= fc_frame_payload_get(fp
, sizeof(*rrq
));
2161 memset(rrq
, 0, sizeof(*rrq
));
2162 rrq
->rrq_cmd
= ELS_RRQ
;
2163 hton24(rrq
->rrq_s_id
, ep
->sid
);
2164 rrq
->rrq_ox_id
= htons(ep
->oxid
);
2165 rrq
->rrq_rx_id
= htons(ep
->rxid
);
2168 if (ep
->esb_stat
& ESB_ST_RESP
)
2171 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, did
,
2172 lport
->port_id
, FC_TYPE_ELS
,
2173 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
2175 if (fc_exch_seq_send(lport
, fp
, fc_exch_rrq_resp
, NULL
, ep
,
2180 spin_lock_bh(&ep
->ex_lock
);
2181 if (ep
->state
& (FC_EX_RST_CLEANUP
| FC_EX_DONE
)) {
2182 spin_unlock_bh(&ep
->ex_lock
);
2183 /* drop hold for rec qual */
2184 fc_exch_release(ep
);
2187 ep
->esb_stat
|= ESB_ST_REC_QUAL
;
2188 fc_exch_timer_set_locked(ep
, ep
->r_a_tov
);
2189 spin_unlock_bh(&ep
->ex_lock
);
2193 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
2194 * @fp: The RRQ frame, not freed here.
2196 static void fc_exch_els_rrq(struct fc_frame
*fp
)
2198 struct fc_lport
*lport
;
2199 struct fc_exch
*ep
= NULL
; /* request or subject exchange */
2200 struct fc_els_rrq
*rp
;
2203 enum fc_els_rjt_explan explan
;
2206 rp
= fc_frame_payload_get(fp
, sizeof(*rp
));
2207 explan
= ELS_EXPL_INV_LEN
;
2212 * lookup subject exchange.
2214 sid
= ntoh24(rp
->rrq_s_id
); /* subject source */
2215 xid
= fc_host_port_id(lport
->host
) == sid
?
2216 ntohs(rp
->rrq_ox_id
) : ntohs(rp
->rrq_rx_id
);
2217 ep
= fc_exch_lookup(lport
, xid
);
2218 explan
= ELS_EXPL_OXID_RXID
;
2221 spin_lock_bh(&ep
->ex_lock
);
2222 if (ep
->oxid
!= ntohs(rp
->rrq_ox_id
))
2224 if (ep
->rxid
!= ntohs(rp
->rrq_rx_id
) &&
2225 ep
->rxid
!= FC_XID_UNKNOWN
)
2227 explan
= ELS_EXPL_SID
;
2232 * Clear Recovery Qualifier state, and cancel timer if complete.
2234 if (ep
->esb_stat
& ESB_ST_REC_QUAL
) {
2235 ep
->esb_stat
&= ~ESB_ST_REC_QUAL
;
2236 atomic_dec(&ep
->ex_refcnt
); /* drop hold for rec qual */
2238 if (ep
->esb_stat
& ESB_ST_COMPLETE
)
2239 fc_exch_timer_cancel(ep
);
2241 spin_unlock_bh(&ep
->ex_lock
);
2250 spin_unlock_bh(&ep
->ex_lock
);
2252 fc_seq_ls_rjt(fp
, ELS_RJT_LOGIC
, explan
);
2255 fc_exch_release(ep
); /* drop hold from fc_exch_find */
2259 * fc_exch_update_stats() - update exches stats to lport
2260 * @lport: The local port to update exchange manager stats
2262 void fc_exch_update_stats(struct fc_lport
*lport
)
2264 struct fc_host_statistics
*st
;
2265 struct fc_exch_mgr_anchor
*ema
;
2266 struct fc_exch_mgr
*mp
;
2268 st
= &lport
->host_stats
;
2270 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
2272 st
->fc_no_free_exch
+= atomic_read(&mp
->stats
.no_free_exch
);
2273 st
->fc_no_free_exch_xid
+=
2274 atomic_read(&mp
->stats
.no_free_exch_xid
);
2275 st
->fc_xid_not_found
+= atomic_read(&mp
->stats
.xid_not_found
);
2276 st
->fc_xid_busy
+= atomic_read(&mp
->stats
.xid_busy
);
2277 st
->fc_seq_not_found
+= atomic_read(&mp
->stats
.seq_not_found
);
2278 st
->fc_non_bls_resp
+= atomic_read(&mp
->stats
.non_bls_resp
);
2281 EXPORT_SYMBOL(fc_exch_update_stats
);
2284 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
2285 * @lport: The local port to add the exchange manager to
2286 * @mp: The exchange manager to be added to the local port
2287 * @match: The match routine that indicates when this EM should be used
2289 struct fc_exch_mgr_anchor
*fc_exch_mgr_add(struct fc_lport
*lport
,
2290 struct fc_exch_mgr
*mp
,
2291 bool (*match
)(struct fc_frame
*))
2293 struct fc_exch_mgr_anchor
*ema
;
2295 ema
= kmalloc(sizeof(*ema
), GFP_ATOMIC
);
2301 /* add EM anchor to EM anchors list */
2302 list_add_tail(&ema
->ema_list
, &lport
->ema_list
);
2303 kref_get(&mp
->kref
);
2306 EXPORT_SYMBOL(fc_exch_mgr_add
);
2309 * fc_exch_mgr_destroy() - Destroy an exchange manager
2310 * @kref: The reference to the EM to be destroyed
2312 static void fc_exch_mgr_destroy(struct kref
*kref
)
2314 struct fc_exch_mgr
*mp
= container_of(kref
, struct fc_exch_mgr
, kref
);
2316 mempool_destroy(mp
->ep_pool
);
2317 free_percpu(mp
->pool
);
2322 * fc_exch_mgr_del() - Delete an EM from a local port's list
2323 * @ema: The exchange manager anchor identifying the EM to be deleted
2325 void fc_exch_mgr_del(struct fc_exch_mgr_anchor
*ema
)
2327 /* remove EM anchor from EM anchors list */
2328 list_del(&ema
->ema_list
);
2329 kref_put(&ema
->mp
->kref
, fc_exch_mgr_destroy
);
2332 EXPORT_SYMBOL(fc_exch_mgr_del
);
2335 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2336 * @src: Source lport to clone exchange managers from
2337 * @dst: New lport that takes references to all the exchange managers
2339 int fc_exch_mgr_list_clone(struct fc_lport
*src
, struct fc_lport
*dst
)
2341 struct fc_exch_mgr_anchor
*ema
, *tmp
;
2343 list_for_each_entry(ema
, &src
->ema_list
, ema_list
) {
2344 if (!fc_exch_mgr_add(dst
, ema
->mp
, ema
->match
))
2349 list_for_each_entry_safe(ema
, tmp
, &dst
->ema_list
, ema_list
)
2350 fc_exch_mgr_del(ema
);
2353 EXPORT_SYMBOL(fc_exch_mgr_list_clone
);
2356 * fc_exch_mgr_alloc() - Allocate an exchange manager
2357 * @lport: The local port that the new EM will be associated with
2358 * @class: The default FC class for new exchanges
2359 * @min_xid: The minimum XID for exchanges from the new EM
2360 * @max_xid: The maximum XID for exchanges from the new EM
2361 * @match: The match routine for the new EM
2363 struct fc_exch_mgr
*fc_exch_mgr_alloc(struct fc_lport
*lport
,
2364 enum fc_class
class,
2365 u16 min_xid
, u16 max_xid
,
2366 bool (*match
)(struct fc_frame
*))
2368 struct fc_exch_mgr
*mp
;
2369 u16 pool_exch_range
;
2372 struct fc_exch_pool
*pool
;
2374 if (max_xid
<= min_xid
|| max_xid
== FC_XID_UNKNOWN
||
2375 (min_xid
& fc_cpu_mask
) != 0) {
2376 FC_LPORT_DBG(lport
, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
2382 * allocate memory for EM
2384 mp
= kzalloc(sizeof(struct fc_exch_mgr
), GFP_ATOMIC
);
2389 /* adjust em exch xid range for offload */
2390 mp
->min_xid
= min_xid
;
2392 /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */
2393 pool_exch_range
= (PCPU_MIN_UNIT_SIZE
- sizeof(*pool
)) /
2394 sizeof(struct fc_exch
*);
2395 if ((max_xid
- min_xid
+ 1) / (fc_cpu_mask
+ 1) > pool_exch_range
) {
2396 mp
->max_xid
= pool_exch_range
* (fc_cpu_mask
+ 1) +
2399 mp
->max_xid
= max_xid
;
2400 pool_exch_range
= (mp
->max_xid
- mp
->min_xid
+ 1) /
2404 mp
->ep_pool
= mempool_create_slab_pool(2, fc_em_cachep
);
2409 * Setup per cpu exch pool with entire exchange id range equally
2410 * divided across all cpus. The exch pointers array memory is
2411 * allocated for exch range per pool.
2413 mp
->pool_max_index
= pool_exch_range
- 1;
2416 * Allocate and initialize per cpu exch pool
2418 pool_size
= sizeof(*pool
) + pool_exch_range
* sizeof(struct fc_exch
*);
2419 mp
->pool
= __alloc_percpu(pool_size
, __alignof__(struct fc_exch_pool
));
2422 for_each_possible_cpu(cpu
) {
2423 pool
= per_cpu_ptr(mp
->pool
, cpu
);
2424 pool
->next_index
= 0;
2425 pool
->left
= FC_XID_UNKNOWN
;
2426 pool
->right
= FC_XID_UNKNOWN
;
2427 spin_lock_init(&pool
->lock
);
2428 INIT_LIST_HEAD(&pool
->ex_list
);
2431 kref_init(&mp
->kref
);
2432 if (!fc_exch_mgr_add(lport
, mp
, match
)) {
2433 free_percpu(mp
->pool
);
2438 * Above kref_init() sets mp->kref to 1 and then
2439 * call to fc_exch_mgr_add incremented mp->kref again,
2440 * so adjust that extra increment.
2442 kref_put(&mp
->kref
, fc_exch_mgr_destroy
);
2446 mempool_destroy(mp
->ep_pool
);
2451 EXPORT_SYMBOL(fc_exch_mgr_alloc
);
2454 * fc_exch_mgr_free() - Free all exchange managers on a local port
2455 * @lport: The local port whose EMs are to be freed
2457 void fc_exch_mgr_free(struct fc_lport
*lport
)
2459 struct fc_exch_mgr_anchor
*ema
, *next
;
2461 flush_workqueue(fc_exch_workqueue
);
2462 list_for_each_entry_safe(ema
, next
, &lport
->ema_list
, ema_list
)
2463 fc_exch_mgr_del(ema
);
2465 EXPORT_SYMBOL(fc_exch_mgr_free
);
2468 * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending
2471 * @lport: The local port the frame was received on
2472 * @fh: The received frame header
2474 static struct fc_exch_mgr_anchor
*fc_find_ema(u32 f_ctl
,
2475 struct fc_lport
*lport
,
2476 struct fc_frame_header
*fh
)
2478 struct fc_exch_mgr_anchor
*ema
;
2481 if (f_ctl
& FC_FC_EX_CTX
)
2482 xid
= ntohs(fh
->fh_ox_id
);
2484 xid
= ntohs(fh
->fh_rx_id
);
2485 if (xid
== FC_XID_UNKNOWN
)
2486 return list_entry(lport
->ema_list
.prev
,
2487 typeof(*ema
), ema_list
);
2490 list_for_each_entry(ema
, &lport
->ema_list
, ema_list
) {
2491 if ((xid
>= ema
->mp
->min_xid
) &&
2492 (xid
<= ema
->mp
->max_xid
))
2498 * fc_exch_recv() - Handler for received frames
2499 * @lport: The local port the frame was received on
2500 * @fp: The received frame
2502 void fc_exch_recv(struct fc_lport
*lport
, struct fc_frame
*fp
)
2504 struct fc_frame_header
*fh
= fc_frame_header_get(fp
);
2505 struct fc_exch_mgr_anchor
*ema
;
2509 if (!lport
|| lport
->state
== LPORT_ST_DISABLED
) {
2510 FC_LPORT_DBG(lport
, "Receiving frames for an lport that "
2511 "has not been initialized correctly\n");
2516 f_ctl
= ntoh24(fh
->fh_f_ctl
);
2517 ema
= fc_find_ema(f_ctl
, lport
, fh
);
2519 FC_LPORT_DBG(lport
, "Unable to find Exchange Manager Anchor,"
2520 "fc_ctl <0x%x>, xid <0x%x>\n",
2522 (f_ctl
& FC_FC_EX_CTX
) ?
2523 ntohs(fh
->fh_ox_id
) :
2524 ntohs(fh
->fh_rx_id
));
2530 * If frame is marked invalid, just drop it.
2532 switch (fr_eof(fp
)) {
2534 if (f_ctl
& FC_FC_END_SEQ
)
2535 skb_trim(fp_skb(fp
), fr_len(fp
) - FC_FC_FILL(f_ctl
));
2538 if (fh
->fh_type
== FC_TYPE_BLS
)
2539 fc_exch_recv_bls(ema
->mp
, fp
);
2540 else if ((f_ctl
& (FC_FC_EX_CTX
| FC_FC_SEQ_CTX
)) ==
2542 fc_exch_recv_seq_resp(ema
->mp
, fp
);
2543 else if (f_ctl
& FC_FC_SEQ_CTX
)
2544 fc_exch_recv_resp(ema
->mp
, fp
);
2545 else /* no EX_CTX and no SEQ_CTX */
2546 fc_exch_recv_req(lport
, ema
->mp
, fp
);
2549 FC_LPORT_DBG(lport
, "dropping invalid frame (eof %x)",
2554 EXPORT_SYMBOL(fc_exch_recv
);
2557 * fc_exch_init() - Initialize the exchange layer for a local port
2558 * @lport: The local port to initialize the exchange layer for
2560 int fc_exch_init(struct fc_lport
*lport
)
2562 if (!lport
->tt
.seq_start_next
)
2563 lport
->tt
.seq_start_next
= fc_seq_start_next
;
2565 if (!lport
->tt
.seq_set_resp
)
2566 lport
->tt
.seq_set_resp
= fc_seq_set_resp
;
2568 if (!lport
->tt
.exch_seq_send
)
2569 lport
->tt
.exch_seq_send
= fc_exch_seq_send
;
2571 if (!lport
->tt
.seq_send
)
2572 lport
->tt
.seq_send
= fc_seq_send
;
2574 if (!lport
->tt
.seq_els_rsp_send
)
2575 lport
->tt
.seq_els_rsp_send
= fc_seq_els_rsp_send
;
2577 if (!lport
->tt
.exch_done
)
2578 lport
->tt
.exch_done
= fc_exch_done
;
2580 if (!lport
->tt
.exch_mgr_reset
)
2581 lport
->tt
.exch_mgr_reset
= fc_exch_mgr_reset
;
2583 if (!lport
->tt
.seq_exch_abort
)
2584 lport
->tt
.seq_exch_abort
= fc_seq_exch_abort
;
2586 if (!lport
->tt
.seq_assign
)
2587 lport
->tt
.seq_assign
= fc_seq_assign
;
2589 if (!lport
->tt
.seq_release
)
2590 lport
->tt
.seq_release
= fc_seq_release
;
2594 EXPORT_SYMBOL(fc_exch_init
);
2597 * fc_setup_exch_mgr() - Setup an exchange manager
2599 int fc_setup_exch_mgr(void)
2601 fc_em_cachep
= kmem_cache_create("libfc_em", sizeof(struct fc_exch
),
2602 0, SLAB_HWCACHE_ALIGN
, NULL
);
2607 * Initialize fc_cpu_mask and fc_cpu_order. The
2608 * fc_cpu_mask is set for nr_cpu_ids rounded up
2609 * to order of 2's * power and order is stored
2610 * in fc_cpu_order as this is later required in
2611 * mapping between an exch id and exch array index
2612 * in per cpu exch pool.
2614 * This round up is required to align fc_cpu_mask
2615 * to exchange id's lower bits such that all incoming
2616 * frames of an exchange gets delivered to the same
2617 * cpu on which exchange originated by simple bitwise
2618 * AND operation between fc_cpu_mask and exchange id.
2620 fc_cpu_order
= ilog2(roundup_pow_of_two(nr_cpu_ids
));
2621 fc_cpu_mask
= (1 << fc_cpu_order
) - 1;
2623 fc_exch_workqueue
= create_singlethread_workqueue("fc_exch_workqueue");
2624 if (!fc_exch_workqueue
)
2628 kmem_cache_destroy(fc_em_cachep
);
2633 * fc_destroy_exch_mgr() - Destroy an exchange manager
2635 void fc_destroy_exch_mgr(void)
2637 destroy_workqueue(fc_exch_workqueue
);
2638 kmem_cache_destroy(fc_em_cachep
);