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);
496 if (fh->fh_type == FC_TYPE_BLS)
500 * Update the exchange and sequence flags,
501 * assuming all frames for the sequence have been sent.
502 * We can only be called to send once for each sequence.
504 spin_lock_bh(&ep->ex_lock);
505 ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */
506 if (f_ctl & FC_FC_SEQ_INIT)
507 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
508 spin_unlock_bh(&ep->ex_lock);
513 * fc_seq_alloc() - Allocate a sequence for a given exchange
514 * @ep: The exchange to allocate a new sequence for
515 * @seq_id: The sequence ID to be used
517 * We don't support multiple originated sequences on the same exchange.
518 * By implication, any previously originated sequence on this exchange
519 * is complete, and we reallocate the same sequence.
521 static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id)
533 * fc_seq_start_next_locked() - Allocate a new sequence on the same
534 * exchange as the supplied sequence
535 * @sp: The sequence/exchange to get a new sequence for
537 static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp)
539 struct fc_exch *ep = fc_seq_exch(sp);
541 sp = fc_seq_alloc(ep, ep->seq_id++);
542 FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n",
548 * fc_seq_start_next() - Lock the exchange and get a new sequence
549 * for a given sequence/exchange pair
550 * @sp: The sequence/exchange to get a new exchange for
552 static struct fc_seq *fc_seq_start_next(struct fc_seq *sp)
554 struct fc_exch *ep = fc_seq_exch(sp);
556 spin_lock_bh(&ep->ex_lock);
557 sp = fc_seq_start_next_locked(sp);
558 spin_unlock_bh(&ep->ex_lock);
564 * Set the response handler for the exchange associated with a sequence.
566 static void fc_seq_set_resp(struct fc_seq *sp,
567 void (*resp)(struct fc_seq *, struct fc_frame *,
571 struct fc_exch *ep = fc_seq_exch(sp);
573 spin_lock_bh(&ep->ex_lock);
576 spin_unlock_bh(&ep->ex_lock);
580 * fc_exch_abort_locked() - Abort an exchange
581 * @ep: The exchange to be aborted
582 * @timer_msec: The period of time to wait before aborting
584 * Locking notes: Called with exch lock held
586 * Return value: 0 on success else error code
588 static int fc_exch_abort_locked(struct fc_exch *ep,
589 unsigned int timer_msec)
595 if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) ||
596 ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP))
600 * Send the abort on a new sequence if possible.
602 sp = fc_seq_start_next_locked(&ep->seq);
606 ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL;
608 fc_exch_timer_set_locked(ep, timer_msec);
611 * If not logged into the fabric, don't send ABTS but leave
612 * sequence active until next timeout.
618 * Send an abort for the sequence that timed out.
620 fp = fc_frame_alloc(ep->lp, 0);
622 fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
623 FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
624 error = fc_seq_send(ep->lp, sp, fp);
631 * fc_seq_exch_abort() - Abort an exchange and sequence
632 * @req_sp: The sequence to be aborted
633 * @timer_msec: The period of time to wait before aborting
635 * Generally called because of a timeout or an abort from the upper layer.
637 * Return value: 0 on success else error code
639 static int fc_seq_exch_abort(const struct fc_seq *req_sp,
640 unsigned int timer_msec)
645 ep = fc_seq_exch(req_sp);
646 spin_lock_bh(&ep->ex_lock);
647 error = fc_exch_abort_locked(ep, timer_msec);
648 spin_unlock_bh(&ep->ex_lock);
653 * fc_exch_timeout() - Handle exchange timer expiration
654 * @work: The work_struct identifying the exchange that timed out
656 static void fc_exch_timeout(struct work_struct *work)
658 struct fc_exch *ep = container_of(work, struct fc_exch,
660 struct fc_seq *sp = &ep->seq;
661 void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
666 FC_EXCH_DBG(ep, "Exchange timed out\n");
668 spin_lock_bh(&ep->ex_lock);
669 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
672 e_stat = ep->esb_stat;
673 if (e_stat & ESB_ST_COMPLETE) {
674 ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL;
675 spin_unlock_bh(&ep->ex_lock);
676 if (e_stat & ESB_ST_REC_QUAL)
683 if (e_stat & ESB_ST_ABNORMAL)
684 rc = fc_exch_done_locked(ep);
685 spin_unlock_bh(&ep->ex_lock);
689 resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg);
690 fc_seq_exch_abort(sp, 2 * ep->r_a_tov);
694 spin_unlock_bh(&ep->ex_lock);
697 * This release matches the hold taken when the timer was set.
703 * fc_exch_em_alloc() - Allocate an exchange from a specified EM.
704 * @lport: The local port that the exchange is for
705 * @mp: The exchange manager that will allocate the exchange
707 * Returns pointer to allocated fc_exch with exch lock held.
709 static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport,
710 struct fc_exch_mgr *mp)
715 struct fc_exch_pool *pool;
717 /* allocate memory for exchange */
718 ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC);
720 atomic_inc(&mp->stats.no_free_exch);
723 memset(ep, 0, sizeof(*ep));
726 pool = per_cpu_ptr(mp->pool, cpu);
727 spin_lock_bh(&pool->lock);
730 /* peek cache of free slot */
731 if (pool->left != FC_XID_UNKNOWN) {
733 pool->left = FC_XID_UNKNOWN;
736 if (pool->right != FC_XID_UNKNOWN) {
738 pool->right = FC_XID_UNKNOWN;
742 index = pool->next_index;
743 /* allocate new exch from pool */
744 while (fc_exch_ptr_get(pool, index)) {
745 index = index == mp->pool_max_index ? 0 : index + 1;
746 if (index == pool->next_index)
749 pool->next_index = index == mp->pool_max_index ? 0 : index + 1;
751 fc_exch_hold(ep); /* hold for exch in mp */
752 spin_lock_init(&ep->ex_lock);
754 * Hold exch lock for caller to prevent fc_exch_reset()
755 * from releasing exch while fc_exch_alloc() caller is
756 * still working on exch.
758 spin_lock_bh(&ep->ex_lock);
760 fc_exch_ptr_set(pool, index, ep);
761 list_add_tail(&ep->ex_list, &pool->ex_list);
762 fc_seq_alloc(ep, ep->seq_id++);
763 pool->total_exches++;
764 spin_unlock_bh(&pool->lock);
769 ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid;
773 ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */
774 ep->rxid = FC_XID_UNKNOWN;
775 ep->class = mp->class;
776 INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout);
780 spin_unlock_bh(&pool->lock);
781 atomic_inc(&mp->stats.no_free_exch_xid);
782 mempool_free(ep, mp->ep_pool);
787 * fc_exch_alloc() - Allocate an exchange from an EM on a
788 * local port's list of EMs.
789 * @lport: The local port that will own the exchange
790 * @fp: The FC frame that the exchange will be for
792 * This function walks the list of exchange manager(EM)
793 * anchors to select an EM for a new exchange allocation. The
794 * EM is selected when a NULL match function pointer is encountered
795 * or when a call to a match function returns true.
797 static inline struct fc_exch *fc_exch_alloc(struct fc_lport *lport,
800 struct fc_exch_mgr_anchor *ema;
802 list_for_each_entry(ema, &lport->ema_list, ema_list)
803 if (!ema->match || ema->match(fp))
804 return fc_exch_em_alloc(lport, ema->mp);
809 * fc_exch_find() - Lookup and hold an exchange
810 * @mp: The exchange manager to lookup the exchange from
811 * @xid: The XID of the exchange to look up
813 static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid)
815 struct fc_exch_pool *pool;
816 struct fc_exch *ep = NULL;
818 if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) {
819 pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask);
820 spin_lock_bh(&pool->lock);
821 ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order);
822 if (ep && ep->xid == xid)
824 spin_unlock_bh(&pool->lock);
831 * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and
832 * the memory allocated for the related objects may be freed.
833 * @sp: The sequence that has completed
835 static void fc_exch_done(struct fc_seq *sp)
837 struct fc_exch *ep = fc_seq_exch(sp);
840 spin_lock_bh(&ep->ex_lock);
841 rc = fc_exch_done_locked(ep);
842 spin_unlock_bh(&ep->ex_lock);
848 * fc_exch_resp() - Allocate a new exchange for a response frame
849 * @lport: The local port that the exchange was for
850 * @mp: The exchange manager to allocate the exchange from
851 * @fp: The response frame
853 * Sets the responder ID in the frame header.
855 static struct fc_exch *fc_exch_resp(struct fc_lport *lport,
856 struct fc_exch_mgr *mp,
860 struct fc_frame_header *fh;
862 ep = fc_exch_alloc(lport, fp);
864 ep->class = fc_frame_class(fp);
867 * Set EX_CTX indicating we're responding on this exchange.
869 ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */
870 ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */
871 fh = fc_frame_header_get(fp);
872 ep->sid = ntoh24(fh->fh_d_id);
873 ep->did = ntoh24(fh->fh_s_id);
877 * Allocated exchange has placed the XID in the
878 * originator field. Move it to the responder field,
879 * and set the originator XID from the frame.
882 ep->oxid = ntohs(fh->fh_ox_id);
883 ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT;
884 if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0)
885 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
887 fc_exch_hold(ep); /* hold for caller */
888 spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */
894 * fc_seq_lookup_recip() - Find a sequence where the other end
895 * originated the sequence
896 * @lport: The local port that the frame was sent to
897 * @mp: The Exchange Manager to lookup the exchange from
898 * @fp: The frame associated with the sequence we're looking for
900 * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
901 * on the ep that should be released by the caller.
903 static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport,
904 struct fc_exch_mgr *mp,
907 struct fc_frame_header *fh = fc_frame_header_get(fp);
908 struct fc_exch *ep = NULL;
909 struct fc_seq *sp = NULL;
910 enum fc_pf_rjt_reason reject = FC_RJT_NONE;
914 f_ctl = ntoh24(fh->fh_f_ctl);
915 WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0);
918 * Lookup or create the exchange if we will be creating the sequence.
920 if (f_ctl & FC_FC_EX_CTX) {
921 xid = ntohs(fh->fh_ox_id); /* we originated exch */
922 ep = fc_exch_find(mp, xid);
924 atomic_inc(&mp->stats.xid_not_found);
925 reject = FC_RJT_OX_ID;
928 if (ep->rxid == FC_XID_UNKNOWN)
929 ep->rxid = ntohs(fh->fh_rx_id);
930 else if (ep->rxid != ntohs(fh->fh_rx_id)) {
931 reject = FC_RJT_OX_ID;
935 xid = ntohs(fh->fh_rx_id); /* we are the responder */
938 * Special case for MDS issuing an ELS TEST with a
940 * XXX take this out once we do the proper reject.
942 if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ &&
943 fc_frame_payload_op(fp) == ELS_TEST) {
944 fh->fh_rx_id = htons(FC_XID_UNKNOWN);
945 xid = FC_XID_UNKNOWN;
949 * new sequence - find the exchange
951 ep = fc_exch_find(mp, xid);
952 if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) {
954 atomic_inc(&mp->stats.xid_busy);
955 reject = FC_RJT_RX_ID;
958 ep = fc_exch_resp(lport, mp, fp);
960 reject = FC_RJT_EXCH_EST; /* XXX */
963 xid = ep->xid; /* get our XID */
965 atomic_inc(&mp->stats.xid_not_found);
966 reject = FC_RJT_RX_ID; /* XID not found */
972 * At this point, we have the exchange held.
973 * Find or create the sequence.
975 if (fc_sof_is_init(fr_sof(fp))) {
977 sp->ssb_stat |= SSB_ST_RESP;
978 sp->id = fh->fh_seq_id;
981 if (sp->id != fh->fh_seq_id) {
982 atomic_inc(&mp->stats.seq_not_found);
983 if (f_ctl & FC_FC_END_SEQ) {
985 * Update sequence_id based on incoming last
986 * frame of sequence exchange. This is needed
987 * for FCoE target where DDP has been used
988 * on target where, stack is indicated only
989 * about last frame's (payload _header) header.
990 * Whereas "seq_id" which is part of
991 * frame_header is allocated by initiator
992 * which is totally different from "seq_id"
993 * allocated when XFER_RDY was sent by target.
994 * To avoid false -ve which results into not
995 * sending RSP, hence write request on other
996 * end never finishes.
998 spin_lock_bh(&ep->ex_lock);
999 sp->ssb_stat |= SSB_ST_RESP;
1000 sp->id = fh->fh_seq_id;
1001 spin_unlock_bh(&ep->ex_lock);
1003 /* sequence/exch should exist */
1004 reject = FC_RJT_SEQ_ID;
1009 WARN_ON(ep != fc_seq_exch(sp));
1011 if (f_ctl & FC_FC_SEQ_INIT)
1012 ep->esb_stat |= ESB_ST_SEQ_INIT;
1018 fc_exch_done(&ep->seq);
1019 fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */
1024 * fc_seq_lookup_orig() - Find a sequence where this end
1025 * originated the sequence
1026 * @mp: The Exchange Manager to lookup the exchange from
1027 * @fp: The frame associated with the sequence we're looking for
1029 * Does not hold the sequence for the caller.
1031 static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp,
1032 struct fc_frame *fp)
1034 struct fc_frame_header *fh = fc_frame_header_get(fp);
1036 struct fc_seq *sp = NULL;
1040 f_ctl = ntoh24(fh->fh_f_ctl);
1041 WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX);
1042 xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id);
1043 ep = fc_exch_find(mp, xid);
1046 if (ep->seq.id == fh->fh_seq_id) {
1048 * Save the RX_ID if we didn't previously know it.
1051 if ((f_ctl & FC_FC_EX_CTX) != 0 &&
1052 ep->rxid == FC_XID_UNKNOWN) {
1053 ep->rxid = ntohs(fh->fh_rx_id);
1056 fc_exch_release(ep);
1061 * fc_exch_set_addr() - Set the source and destination IDs for an exchange
1062 * @ep: The exchange to set the addresses for
1063 * @orig_id: The originator's ID
1064 * @resp_id: The responder's ID
1066 * Note this must be done before the first sequence of the exchange is sent.
1068 static void fc_exch_set_addr(struct fc_exch *ep,
1069 u32 orig_id, u32 resp_id)
1072 if (ep->esb_stat & ESB_ST_RESP) {
1082 * fc_seq_els_rsp_send() - Send an ELS response using information from
1083 * the existing sequence/exchange.
1084 * @fp: The received frame
1085 * @els_cmd: The ELS command to be sent
1086 * @els_data: The ELS data to be sent
1088 * The received frame is not freed.
1090 static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd,
1091 struct fc_seq_els_data *els_data)
1095 fc_seq_ls_rjt(fp, els_data->reason, els_data->explan);
1101 fc_exch_els_rrq(fp);
1104 fc_exch_els_rec(fp);
1107 FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd);
1112 * fc_seq_send_last() - Send a sequence that is the last in the exchange
1113 * @sp: The sequence that is to be sent
1114 * @fp: The frame that will be sent on the sequence
1115 * @rctl: The R_CTL information to be sent
1116 * @fh_type: The frame header type
1118 static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp,
1119 enum fc_rctl rctl, enum fc_fh_type fh_type)
1122 struct fc_exch *ep = fc_seq_exch(sp);
1124 f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
1126 fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0);
1127 fc_seq_send(ep->lp, sp, fp);
1131 * fc_seq_send_ack() - Send an acknowledgement that we've received a frame
1132 * @sp: The sequence to send the ACK on
1133 * @rx_fp: The received frame that is being acknoledged
1135 * Send ACK_1 (or equiv.) indicating we received something.
1137 static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp)
1139 struct fc_frame *fp;
1140 struct fc_frame_header *rx_fh;
1141 struct fc_frame_header *fh;
1142 struct fc_exch *ep = fc_seq_exch(sp);
1143 struct fc_lport *lport = ep->lp;
1147 * Don't send ACKs for class 3.
1149 if (fc_sof_needs_ack(fr_sof(rx_fp))) {
1150 fp = fc_frame_alloc(lport, 0);
1154 fh = fc_frame_header_get(fp);
1155 fh->fh_r_ctl = FC_RCTL_ACK_1;
1156 fh->fh_type = FC_TYPE_BLS;
1159 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1160 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1161 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1162 * Last ACK uses bits 7-6 (continue sequence),
1163 * bits 5-4 are meaningful (what kind of ACK to use).
1165 rx_fh = fc_frame_header_get(rx_fp);
1166 f_ctl = ntoh24(rx_fh->fh_f_ctl);
1167 f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
1168 FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ |
1169 FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT |
1170 FC_FC_RETX_SEQ | FC_FC_UNI_TX;
1171 f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
1172 hton24(fh->fh_f_ctl, f_ctl);
1174 fc_exch_setup_hdr(ep, fp, f_ctl);
1175 fh->fh_seq_id = rx_fh->fh_seq_id;
1176 fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
1177 fh->fh_parm_offset = htonl(1); /* ack single frame */
1179 fr_sof(fp) = fr_sof(rx_fp);
1180 if (f_ctl & FC_FC_END_SEQ)
1181 fr_eof(fp) = FC_EOF_T;
1183 fr_eof(fp) = FC_EOF_N;
1185 lport->tt.frame_send(lport, fp);
1190 * fc_exch_send_ba_rjt() - Send BLS Reject
1191 * @rx_fp: The frame being rejected
1192 * @reason: The reason the frame is being rejected
1193 * @explan: The explanation for the rejection
1195 * This is for rejecting BA_ABTS only.
1197 static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp,
1198 enum fc_ba_rjt_reason reason,
1199 enum fc_ba_rjt_explan explan)
1201 struct fc_frame *fp;
1202 struct fc_frame_header *rx_fh;
1203 struct fc_frame_header *fh;
1204 struct fc_ba_rjt *rp;
1205 struct fc_lport *lport;
1208 lport = fr_dev(rx_fp);
1209 fp = fc_frame_alloc(lport, sizeof(*rp));
1212 fh = fc_frame_header_get(fp);
1213 rx_fh = fc_frame_header_get(rx_fp);
1215 memset(fh, 0, sizeof(*fh) + sizeof(*rp));
1217 rp = fc_frame_payload_get(fp, sizeof(*rp));
1218 rp->br_reason = reason;
1219 rp->br_explan = explan;
1222 * seq_id, cs_ctl, df_ctl and param/offset are zero.
1224 memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3);
1225 memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3);
1226 fh->fh_ox_id = rx_fh->fh_ox_id;
1227 fh->fh_rx_id = rx_fh->fh_rx_id;
1228 fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
1229 fh->fh_r_ctl = FC_RCTL_BA_RJT;
1230 fh->fh_type = FC_TYPE_BLS;
1233 * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
1234 * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
1235 * Bits 9-8 are meaningful (retransmitted or unidirectional).
1236 * Last ACK uses bits 7-6 (continue sequence),
1237 * bits 5-4 are meaningful (what kind of ACK to use).
1238 * Always set LAST_SEQ, END_SEQ.
1240 f_ctl = ntoh24(rx_fh->fh_f_ctl);
1241 f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
1242 FC_FC_END_CONN | FC_FC_SEQ_INIT |
1243 FC_FC_RETX_SEQ | FC_FC_UNI_TX;
1244 f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
1245 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
1246 f_ctl &= ~FC_FC_FIRST_SEQ;
1247 hton24(fh->fh_f_ctl, f_ctl);
1249 fr_sof(fp) = fc_sof_class(fr_sof(rx_fp));
1250 fr_eof(fp) = FC_EOF_T;
1251 if (fc_sof_needs_ack(fr_sof(fp)))
1252 fr_eof(fp) = FC_EOF_N;
1254 lport->tt.frame_send(lport, fp);
1258 * fc_exch_recv_abts() - Handle an incoming ABTS
1259 * @ep: The exchange the abort was on
1260 * @rx_fp: The ABTS frame
1262 * This would be for target mode usually, but could be due to lost
1263 * FCP transfer ready, confirm or RRQ. We always handle this as an
1264 * exchange abort, ignoring the parameter.
1266 static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
1268 struct fc_frame *fp;
1269 struct fc_ba_acc *ap;
1270 struct fc_frame_header *fh;
1275 spin_lock_bh(&ep->ex_lock);
1276 if (ep->esb_stat & ESB_ST_COMPLETE) {
1277 spin_unlock_bh(&ep->ex_lock);
1280 if (!(ep->esb_stat & ESB_ST_REC_QUAL))
1281 fc_exch_hold(ep); /* hold for REC_QUAL */
1282 ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL;
1283 fc_exch_timer_set_locked(ep, ep->r_a_tov);
1285 fp = fc_frame_alloc(ep->lp, sizeof(*ap));
1287 spin_unlock_bh(&ep->ex_lock);
1290 fh = fc_frame_header_get(fp);
1291 ap = fc_frame_payload_get(fp, sizeof(*ap));
1292 memset(ap, 0, sizeof(*ap));
1294 ap->ba_high_seq_cnt = htons(0xffff);
1295 if (sp->ssb_stat & SSB_ST_RESP) {
1296 ap->ba_seq_id = sp->id;
1297 ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL;
1298 ap->ba_high_seq_cnt = fh->fh_seq_cnt;
1299 ap->ba_low_seq_cnt = htons(sp->cnt);
1301 sp = fc_seq_start_next_locked(sp);
1302 spin_unlock_bh(&ep->ex_lock);
1303 fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
1304 fc_frame_free(rx_fp);
1308 fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID);
1310 fc_frame_free(rx_fp);
1314 * fc_seq_assign() - Assign exchange and sequence for incoming request
1315 * @lport: The local port that received the request
1316 * @fp: The request frame
1318 * On success, the sequence pointer will be returned and also in fr_seq(@fp).
1319 * A reference will be held on the exchange/sequence for the caller, which
1320 * must call fc_seq_release().
1322 static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp)
1324 struct fc_exch_mgr_anchor *ema;
1326 WARN_ON(lport != fr_dev(fp));
1327 WARN_ON(fr_seq(fp));
1330 list_for_each_entry(ema, &lport->ema_list, ema_list)
1331 if ((!ema->match || ema->match(fp)) &&
1332 fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE)
1338 * fc_seq_release() - Release the hold
1339 * @sp: The sequence.
1341 static void fc_seq_release(struct fc_seq *sp)
1343 fc_exch_release(fc_seq_exch(sp));
1347 * fc_exch_recv_req() - Handler for an incoming request
1348 * @lport: The local port that received the request
1349 * @mp: The EM that the exchange is on
1350 * @fp: The request frame
1352 * This is used when the other end is originating the exchange
1355 static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp,
1356 struct fc_frame *fp)
1358 struct fc_frame_header *fh = fc_frame_header_get(fp);
1359 struct fc_seq *sp = NULL;
1360 struct fc_exch *ep = NULL;
1361 enum fc_pf_rjt_reason reject;
1363 /* We can have the wrong fc_lport at this point with NPIV, which is a
1364 * problem now that we know a new exchange needs to be allocated
1366 lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id));
1373 BUG_ON(fr_seq(fp)); /* XXX remove later */
1376 * If the RX_ID is 0xffff, don't allocate an exchange.
1377 * The upper-level protocol may request one later, if needed.
1379 if (fh->fh_rx_id == htons(FC_XID_UNKNOWN))
1380 return lport->tt.lport_recv(lport, fp);
1382 reject = fc_seq_lookup_recip(lport, mp, fp);
1383 if (reject == FC_RJT_NONE) {
1384 sp = fr_seq(fp); /* sequence will be held */
1385 ep = fc_seq_exch(sp);
1386 fc_seq_send_ack(sp, fp);
1387 ep->encaps = fr_encaps(fp);
1390 * Call the receive function.
1392 * The receive function may allocate a new sequence
1393 * over the old one, so we shouldn't change the
1394 * sequence after this.
1396 * The frame will be freed by the receive function.
1397 * If new exch resp handler is valid then call that
1401 ep->resp(sp, fp, ep->arg);
1403 lport->tt.lport_recv(lport, fp);
1404 fc_exch_release(ep); /* release from lookup */
1406 FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n",
1413 * fc_exch_recv_seq_resp() - Handler for an incoming response where the other
1414 * end is the originator of the sequence that is a
1415 * response to our initial exchange
1416 * @mp: The EM that the exchange is on
1417 * @fp: The response frame
1419 static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
1421 struct fc_frame_header *fh = fc_frame_header_get(fp);
1426 void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
1430 ep = fc_exch_find(mp, ntohs(fh->fh_ox_id));
1432 atomic_inc(&mp->stats.xid_not_found);
1435 if (ep->esb_stat & ESB_ST_COMPLETE) {
1436 atomic_inc(&mp->stats.xid_not_found);
1439 if (ep->rxid == FC_XID_UNKNOWN)
1440 ep->rxid = ntohs(fh->fh_rx_id);
1441 if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) {
1442 atomic_inc(&mp->stats.xid_not_found);
1445 if (ep->did != ntoh24(fh->fh_s_id) &&
1446 ep->did != FC_FID_FLOGI) {
1447 atomic_inc(&mp->stats.xid_not_found);
1452 if (fc_sof_is_init(sof)) {
1453 sp->ssb_stat |= SSB_ST_RESP;
1454 sp->id = fh->fh_seq_id;
1455 } else if (sp->id != fh->fh_seq_id) {
1456 atomic_inc(&mp->stats.seq_not_found);
1460 f_ctl = ntoh24(fh->fh_f_ctl);
1462 if (f_ctl & FC_FC_SEQ_INIT)
1463 ep->esb_stat |= ESB_ST_SEQ_INIT;
1465 if (fc_sof_needs_ack(sof))
1466 fc_seq_send_ack(sp, fp);
1468 ex_resp_arg = ep->arg;
1470 if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T &&
1471 (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
1472 (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
1473 spin_lock_bh(&ep->ex_lock);
1475 rc = fc_exch_done_locked(ep);
1476 WARN_ON(fc_seq_exch(sp) != ep);
1477 spin_unlock_bh(&ep->ex_lock);
1483 * Call the receive function.
1484 * The sequence is held (has a refcnt) for us,
1485 * but not for the receive function.
1487 * The receive function may allocate a new sequence
1488 * over the old one, so we shouldn't change the
1489 * sequence after this.
1491 * The frame will be freed by the receive function.
1492 * If new exch resp handler is valid then call that
1496 resp(sp, fp, ex_resp_arg);
1499 fc_exch_release(ep);
1502 fc_exch_release(ep);
1508 * fc_exch_recv_resp() - Handler for a sequence where other end is
1509 * responding to our sequence
1510 * @mp: The EM that the exchange is on
1511 * @fp: The response frame
1513 static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
1517 sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */
1520 atomic_inc(&mp->stats.xid_not_found);
1522 atomic_inc(&mp->stats.non_bls_resp);
1528 * fc_exch_abts_resp() - Handler for a response to an ABT
1529 * @ep: The exchange that the frame is on
1530 * @fp: The response frame
1532 * This response would be to an ABTS cancelling an exchange or sequence.
1533 * The response can be either BA_ACC or BA_RJT
1535 static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
1537 void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
1539 struct fc_frame_header *fh;
1540 struct fc_ba_acc *ap;
1544 int rc = 1, has_rec = 0;
1546 fh = fc_frame_header_get(fp);
1547 FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl,
1548 fc_exch_rctl_name(fh->fh_r_ctl));
1550 if (cancel_delayed_work_sync(&ep->timeout_work))
1551 fc_exch_release(ep); /* release from pending timer hold */
1553 spin_lock_bh(&ep->ex_lock);
1554 switch (fh->fh_r_ctl) {
1555 case FC_RCTL_BA_ACC:
1556 ap = fc_frame_payload_get(fp, sizeof(*ap));
1561 * Decide whether to establish a Recovery Qualifier.
1562 * We do this if there is a non-empty SEQ_CNT range and
1563 * SEQ_ID is the same as the one we aborted.
1565 low = ntohs(ap->ba_low_seq_cnt);
1566 high = ntohs(ap->ba_high_seq_cnt);
1567 if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 &&
1568 (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL ||
1569 ap->ba_seq_id == ep->seq_id) && low != high) {
1570 ep->esb_stat |= ESB_ST_REC_QUAL;
1571 fc_exch_hold(ep); /* hold for recovery qualifier */
1575 case FC_RCTL_BA_RJT:
1582 ex_resp_arg = ep->arg;
1584 /* do we need to do some other checks here. Can we reuse more of
1585 * fc_exch_recv_seq_resp
1589 * do we want to check END_SEQ as well as LAST_SEQ here?
1591 if (ep->fh_type != FC_TYPE_FCP &&
1592 ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ)
1593 rc = fc_exch_done_locked(ep);
1594 spin_unlock_bh(&ep->ex_lock);
1599 resp(sp, fp, ex_resp_arg);
1604 fc_exch_timer_set(ep, ep->r_a_tov);
1609 * fc_exch_recv_bls() - Handler for a BLS sequence
1610 * @mp: The EM that the exchange is on
1611 * @fp: The request frame
1613 * The BLS frame is always a sequence initiated by the remote side.
1614 * We may be either the originator or recipient of the exchange.
1616 static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp)
1618 struct fc_frame_header *fh;
1622 fh = fc_frame_header_get(fp);
1623 f_ctl = ntoh24(fh->fh_f_ctl);
1626 ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ?
1627 ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id));
1628 if (ep && (f_ctl & FC_FC_SEQ_INIT)) {
1629 spin_lock_bh(&ep->ex_lock);
1630 ep->esb_stat |= ESB_ST_SEQ_INIT;
1631 spin_unlock_bh(&ep->ex_lock);
1633 if (f_ctl & FC_FC_SEQ_CTX) {
1635 * A response to a sequence we initiated.
1636 * This should only be ACKs for class 2 or F.
1638 switch (fh->fh_r_ctl) {
1643 FC_EXCH_DBG(ep, "BLS rctl %x - %s received",
1645 fc_exch_rctl_name(fh->fh_r_ctl));
1650 switch (fh->fh_r_ctl) {
1651 case FC_RCTL_BA_RJT:
1652 case FC_RCTL_BA_ACC:
1654 fc_exch_abts_resp(ep, fp);
1658 case FC_RCTL_BA_ABTS:
1659 fc_exch_recv_abts(ep, fp);
1661 default: /* ignore junk */
1667 fc_exch_release(ep); /* release hold taken by fc_exch_find */
1671 * fc_seq_ls_acc() - Accept sequence with LS_ACC
1672 * @rx_fp: The received frame, not freed here.
1674 * If this fails due to allocation or transmit congestion, assume the
1675 * originator will repeat the sequence.
1677 static void fc_seq_ls_acc(struct fc_frame *rx_fp)
1679 struct fc_lport *lport;
1680 struct fc_els_ls_acc *acc;
1681 struct fc_frame *fp;
1683 lport = fr_dev(rx_fp);
1684 fp = fc_frame_alloc(lport, sizeof(*acc));
1687 acc = fc_frame_payload_get(fp, sizeof(*acc));
1688 memset(acc, 0, sizeof(*acc));
1689 acc->la_cmd = ELS_LS_ACC;
1690 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1691 lport->tt.frame_send(lport, fp);
1695 * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT
1696 * @rx_fp: The received frame, not freed here.
1697 * @reason: The reason the sequence is being rejected
1698 * @explan: The explanation for the rejection
1700 * If this fails due to allocation or transmit congestion, assume the
1701 * originator will repeat the sequence.
1703 static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason,
1704 enum fc_els_rjt_explan explan)
1706 struct fc_lport *lport;
1707 struct fc_els_ls_rjt *rjt;
1708 struct fc_frame *fp;
1710 lport = fr_dev(rx_fp);
1711 fp = fc_frame_alloc(lport, sizeof(*rjt));
1714 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1715 memset(rjt, 0, sizeof(*rjt));
1716 rjt->er_cmd = ELS_LS_RJT;
1717 rjt->er_reason = reason;
1718 rjt->er_explan = explan;
1719 fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
1720 lport->tt.frame_send(lport, fp);
1724 * fc_exch_reset() - Reset an exchange
1725 * @ep: The exchange to be reset
1727 static void fc_exch_reset(struct fc_exch *ep)
1730 void (*resp)(struct fc_seq *, struct fc_frame *, void *);
1734 spin_lock_bh(&ep->ex_lock);
1735 fc_exch_abort_locked(ep, 0);
1736 ep->state |= FC_EX_RST_CLEANUP;
1737 if (cancel_delayed_work(&ep->timeout_work))
1738 atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
1741 if (ep->esb_stat & ESB_ST_REC_QUAL)
1742 atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */
1743 ep->esb_stat &= ~ESB_ST_REC_QUAL;
1746 rc = fc_exch_done_locked(ep);
1747 spin_unlock_bh(&ep->ex_lock);
1752 resp(sp, ERR_PTR(-FC_EX_CLOSED), arg);
1756 * fc_exch_pool_reset() - Reset a per cpu exchange pool
1757 * @lport: The local port that the exchange pool is on
1758 * @pool: The exchange pool to be reset
1759 * @sid: The source ID
1760 * @did: The destination ID
1762 * Resets a per cpu exches pool, releasing all of its sequences
1763 * and exchanges. If sid is non-zero then reset only exchanges
1764 * we sourced from the local port's FID. If did is non-zero then
1765 * only reset exchanges destined for the local port's FID.
1767 static void fc_exch_pool_reset(struct fc_lport *lport,
1768 struct fc_exch_pool *pool,
1772 struct fc_exch *next;
1774 spin_lock_bh(&pool->lock);
1776 list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) {
1777 if ((lport == ep->lp) &&
1778 (sid == 0 || sid == ep->sid) &&
1779 (did == 0 || did == ep->did)) {
1781 spin_unlock_bh(&pool->lock);
1785 fc_exch_release(ep);
1786 spin_lock_bh(&pool->lock);
1789 * must restart loop incase while lock
1790 * was down multiple eps were released.
1795 spin_unlock_bh(&pool->lock);
1799 * fc_exch_mgr_reset() - Reset all EMs of a local port
1800 * @lport: The local port whose EMs are to be reset
1801 * @sid: The source ID
1802 * @did: The destination ID
1804 * Reset all EMs associated with a given local port. Release all
1805 * sequences and exchanges. If sid is non-zero then reset only the
1806 * exchanges sent from the local port's FID. If did is non-zero then
1807 * reset only exchanges destined for the local port's FID.
1809 void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did)
1811 struct fc_exch_mgr_anchor *ema;
1814 list_for_each_entry(ema, &lport->ema_list, ema_list) {
1815 for_each_possible_cpu(cpu)
1816 fc_exch_pool_reset(lport,
1817 per_cpu_ptr(ema->mp->pool, cpu),
1821 EXPORT_SYMBOL(fc_exch_mgr_reset);
1824 * fc_exch_lookup() - find an exchange
1825 * @lport: The local port
1826 * @xid: The exchange ID
1828 * Returns exchange pointer with hold for caller, or NULL if not found.
1830 static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid)
1832 struct fc_exch_mgr_anchor *ema;
1834 list_for_each_entry(ema, &lport->ema_list, ema_list)
1835 if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid)
1836 return fc_exch_find(ema->mp, xid);
1841 * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests
1842 * @rfp: The REC frame, not freed here.
1844 * Note that the requesting port may be different than the S_ID in the request.
1846 static void fc_exch_els_rec(struct fc_frame *rfp)
1848 struct fc_lport *lport;
1849 struct fc_frame *fp;
1851 struct fc_els_rec *rp;
1852 struct fc_els_rec_acc *acc;
1853 enum fc_els_rjt_reason reason = ELS_RJT_LOGIC;
1854 enum fc_els_rjt_explan explan;
1859 lport = fr_dev(rfp);
1860 rp = fc_frame_payload_get(rfp, sizeof(*rp));
1861 explan = ELS_EXPL_INV_LEN;
1864 sid = ntoh24(rp->rec_s_id);
1865 rxid = ntohs(rp->rec_rx_id);
1866 oxid = ntohs(rp->rec_ox_id);
1868 ep = fc_exch_lookup(lport,
1869 sid == fc_host_port_id(lport->host) ? oxid : rxid);
1870 explan = ELS_EXPL_OXID_RXID;
1873 if (ep->oid != sid || oxid != ep->oxid)
1875 if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid)
1877 fp = fc_frame_alloc(lport, sizeof(*acc));
1881 acc = fc_frame_payload_get(fp, sizeof(*acc));
1882 memset(acc, 0, sizeof(*acc));
1883 acc->reca_cmd = ELS_LS_ACC;
1884 acc->reca_ox_id = rp->rec_ox_id;
1885 memcpy(acc->reca_ofid, rp->rec_s_id, 3);
1886 acc->reca_rx_id = htons(ep->rxid);
1887 if (ep->sid == ep->oid)
1888 hton24(acc->reca_rfid, ep->did);
1890 hton24(acc->reca_rfid, ep->sid);
1891 acc->reca_fc4value = htonl(ep->seq.rec_data);
1892 acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP |
1895 fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0);
1896 lport->tt.frame_send(lport, fp);
1898 fc_exch_release(ep);
1902 fc_exch_release(ep);
1904 fc_seq_ls_rjt(rfp, reason, explan);
1908 * fc_exch_rrq_resp() - Handler for RRQ responses
1909 * @sp: The sequence that the RRQ is on
1910 * @fp: The RRQ frame
1911 * @arg: The exchange that the RRQ is on
1913 * TODO: fix error handler.
1915 static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
1917 struct fc_exch *aborted_ep = arg;
1921 int err = PTR_ERR(fp);
1923 if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT)
1925 FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, "
1926 "frame error %d\n", err);
1930 op = fc_frame_payload_op(fp);
1935 FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ");
1940 FC_EXCH_DBG(aborted_ep, "unexpected response op %x "
1946 fc_exch_done(&aborted_ep->seq);
1947 /* drop hold for rec qual */
1948 fc_exch_release(aborted_ep);
1953 * fc_exch_seq_send() - Send a frame using a new exchange and sequence
1954 * @lport: The local port to send the frame on
1955 * @fp: The frame to be sent
1956 * @resp: The response handler for this request
1957 * @destructor: The destructor for the exchange
1958 * @arg: The argument to be passed to the response handler
1959 * @timer_msec: The timeout period for the exchange
1961 * The frame pointer with some of the header's fields must be
1962 * filled before calling this routine, those fields are:
1969 * - parameter or relative offset
1971 static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport,
1972 struct fc_frame *fp,
1973 void (*resp)(struct fc_seq *,
1974 struct fc_frame *fp,
1976 void (*destructor)(struct fc_seq *,
1978 void *arg, u32 timer_msec)
1981 struct fc_seq *sp = NULL;
1982 struct fc_frame_header *fh;
1983 struct fc_fcp_pkt *fsp = NULL;
1986 ep = fc_exch_alloc(lport, fp);
1991 ep->esb_stat |= ESB_ST_SEQ_INIT;
1992 fh = fc_frame_header_get(fp);
1993 fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id));
1995 ep->destructor = destructor;
1997 ep->r_a_tov = FC_DEF_R_A_TOV;
2001 ep->fh_type = fh->fh_type; /* save for possbile timeout handling */
2002 ep->f_ctl = ntoh24(fh->fh_f_ctl);
2003 fc_exch_setup_hdr(ep, fp, ep->f_ctl);
2006 if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) {
2008 fc_fcp_ddp_setup(fr_fsp(fp), ep->xid);
2011 if (unlikely(lport->tt.frame_send(lport, fp)))
2015 fc_exch_timer_set_locked(ep, timer_msec);
2016 ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */
2018 if (ep->f_ctl & FC_FC_SEQ_INIT)
2019 ep->esb_stat &= ~ESB_ST_SEQ_INIT;
2020 spin_unlock_bh(&ep->ex_lock);
2024 fc_fcp_ddp_done(fsp);
2025 rc = fc_exch_done_locked(ep);
2026 spin_unlock_bh(&ep->ex_lock);
2033 * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command
2034 * @ep: The exchange to send the RRQ on
2036 * This tells the remote port to stop blocking the use of
2037 * the exchange and the seq_cnt range.
2039 static void fc_exch_rrq(struct fc_exch *ep)
2041 struct fc_lport *lport;
2042 struct fc_els_rrq *rrq;
2043 struct fc_frame *fp;
2048 fp = fc_frame_alloc(lport, sizeof(*rrq));
2052 rrq = fc_frame_payload_get(fp, sizeof(*rrq));
2053 memset(rrq, 0, sizeof(*rrq));
2054 rrq->rrq_cmd = ELS_RRQ;
2055 hton24(rrq->rrq_s_id, ep->sid);
2056 rrq->rrq_ox_id = htons(ep->oxid);
2057 rrq->rrq_rx_id = htons(ep->rxid);
2060 if (ep->esb_stat & ESB_ST_RESP)
2063 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did,
2064 lport->port_id, FC_TYPE_ELS,
2065 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
2067 if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep,
2072 spin_lock_bh(&ep->ex_lock);
2073 if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) {
2074 spin_unlock_bh(&ep->ex_lock);
2075 /* drop hold for rec qual */
2076 fc_exch_release(ep);
2079 ep->esb_stat |= ESB_ST_REC_QUAL;
2080 fc_exch_timer_set_locked(ep, ep->r_a_tov);
2081 spin_unlock_bh(&ep->ex_lock);
2085 * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests
2086 * @fp: The RRQ frame, not freed here.
2088 static void fc_exch_els_rrq(struct fc_frame *fp)
2090 struct fc_lport *lport;
2091 struct fc_exch *ep = NULL; /* request or subject exchange */
2092 struct fc_els_rrq *rp;
2095 enum fc_els_rjt_explan explan;
2098 rp = fc_frame_payload_get(fp, sizeof(*rp));
2099 explan = ELS_EXPL_INV_LEN;
2104 * lookup subject exchange.
2106 sid = ntoh24(rp->rrq_s_id); /* subject source */
2107 xid = fc_host_port_id(lport->host) == sid ?
2108 ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id);
2109 ep = fc_exch_lookup(lport, xid);
2110 explan = ELS_EXPL_OXID_RXID;
2113 spin_lock_bh(&ep->ex_lock);
2114 if (ep->oxid != ntohs(rp->rrq_ox_id))
2116 if (ep->rxid != ntohs(rp->rrq_rx_id) &&
2117 ep->rxid != FC_XID_UNKNOWN)
2119 explan = ELS_EXPL_SID;
2124 * Clear Recovery Qualifier state, and cancel timer if complete.
2126 if (ep->esb_stat & ESB_ST_REC_QUAL) {
2127 ep->esb_stat &= ~ESB_ST_REC_QUAL;
2128 atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */
2130 if (ep->esb_stat & ESB_ST_COMPLETE) {
2131 if (cancel_delayed_work(&ep->timeout_work))
2132 atomic_dec(&ep->ex_refcnt); /* drop timer hold */
2135 spin_unlock_bh(&ep->ex_lock);
2144 spin_unlock_bh(&ep->ex_lock);
2146 fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan);
2149 fc_exch_release(ep); /* drop hold from fc_exch_find */
2153 * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs
2154 * @lport: The local port to add the exchange manager to
2155 * @mp: The exchange manager to be added to the local port
2156 * @match: The match routine that indicates when this EM should be used
2158 struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
2159 struct fc_exch_mgr *mp,
2160 bool (*match)(struct fc_frame *))
2162 struct fc_exch_mgr_anchor *ema;
2164 ema = kmalloc(sizeof(*ema), GFP_ATOMIC);
2170 /* add EM anchor to EM anchors list */
2171 list_add_tail(&ema->ema_list, &lport->ema_list);
2172 kref_get(&mp->kref);
2175 EXPORT_SYMBOL(fc_exch_mgr_add);
2178 * fc_exch_mgr_destroy() - Destroy an exchange manager
2179 * @kref: The reference to the EM to be destroyed
2181 static void fc_exch_mgr_destroy(struct kref *kref)
2183 struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref);
2185 mempool_destroy(mp->ep_pool);
2186 free_percpu(mp->pool);
2191 * fc_exch_mgr_del() - Delete an EM from a local port's list
2192 * @ema: The exchange manager anchor identifying the EM to be deleted
2194 void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema)
2196 /* remove EM anchor from EM anchors list */
2197 list_del(&ema->ema_list);
2198 kref_put(&ema->mp->kref, fc_exch_mgr_destroy);
2201 EXPORT_SYMBOL(fc_exch_mgr_del);
2204 * fc_exch_mgr_list_clone() - Share all exchange manager objects
2205 * @src: Source lport to clone exchange managers from
2206 * @dst: New lport that takes references to all the exchange managers
2208 int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst)
2210 struct fc_exch_mgr_anchor *ema, *tmp;
2212 list_for_each_entry(ema, &src->ema_list, ema_list) {
2213 if (!fc_exch_mgr_add(dst, ema->mp, ema->match))
2218 list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list)
2219 fc_exch_mgr_del(ema);
2222 EXPORT_SYMBOL(fc_exch_mgr_list_clone);
2225 * fc_exch_mgr_alloc() - Allocate an exchange manager
2226 * @lport: The local port that the new EM will be associated with
2227 * @class: The default FC class for new exchanges
2228 * @min_xid: The minimum XID for exchanges from the new EM
2229 * @max_xid: The maximum XID for exchanges from the new EM
2230 * @match: The match routine for the new EM
2232 struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport,
2233 enum fc_class class,
2234 u16 min_xid, u16 max_xid,
2235 bool (*match)(struct fc_frame *))
2237 struct fc_exch_mgr *mp;
2238 u16 pool_exch_range;
2241 struct fc_exch_pool *pool;
2243 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN ||
2244 (min_xid & fc_cpu_mask) != 0) {
2245 FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n",
2251 * allocate memory for EM
2253 mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC);
2258 /* adjust em exch xid range for offload */
2259 mp->min_xid = min_xid;
2260 mp->max_xid = max_xid;
2262 mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
2267 * Setup per cpu exch pool with entire exchange id range equally
2268 * divided across all cpus. The exch pointers array memory is
2269 * allocated for exch range per pool.
2271 pool_exch_range = (mp->max_xid - mp->min_xid + 1) / (fc_cpu_mask + 1);
2272 mp->pool_max_index = pool_exch_range - 1;
2275 * Allocate and initialize per cpu exch pool
2277 pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *);
2278 mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool));
2281 for_each_possible_cpu(cpu) {
2282 pool = per_cpu_ptr(mp->pool, cpu);
2283 pool->left = FC_XID_UNKNOWN;
2284 pool->right = FC_XID_UNKNOWN;
2285 spin_lock_init(&pool->lock);
2286 INIT_LIST_HEAD(&pool->ex_list);
2289 kref_init(&mp->kref);
2290 if (!fc_exch_mgr_add(lport, mp, match)) {
2291 free_percpu(mp->pool);
2296 * Above kref_init() sets mp->kref to 1 and then
2297 * call to fc_exch_mgr_add incremented mp->kref again,
2298 * so adjust that extra increment.
2300 kref_put(&mp->kref, fc_exch_mgr_destroy);
2304 mempool_destroy(mp->ep_pool);
2309 EXPORT_SYMBOL(fc_exch_mgr_alloc);
2312 * fc_exch_mgr_free() - Free all exchange managers on a local port
2313 * @lport: The local port whose EMs are to be freed
2315 void fc_exch_mgr_free(struct fc_lport *lport)
2317 struct fc_exch_mgr_anchor *ema, *next;
2319 flush_workqueue(fc_exch_workqueue);
2320 list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list)
2321 fc_exch_mgr_del(ema);
2323 EXPORT_SYMBOL(fc_exch_mgr_free);
2326 * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending
2329 * @lport: The local port the frame was received on
2330 * @fh: The received frame header
2332 static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl,
2333 struct fc_lport *lport,
2334 struct fc_frame_header *fh)
2336 struct fc_exch_mgr_anchor *ema;
2339 if (f_ctl & FC_FC_EX_CTX)
2340 xid = ntohs(fh->fh_ox_id);
2342 xid = ntohs(fh->fh_rx_id);
2343 if (xid == FC_XID_UNKNOWN)
2344 return list_entry(lport->ema_list.prev,
2345 typeof(*ema), ema_list);
2348 list_for_each_entry(ema, &lport->ema_list, ema_list) {
2349 if ((xid >= ema->mp->min_xid) &&
2350 (xid <= ema->mp->max_xid))
2356 * fc_exch_recv() - Handler for received frames
2357 * @lport: The local port the frame was received on
2358 * @fp: The received frame
2360 void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp)
2362 struct fc_frame_header *fh = fc_frame_header_get(fp);
2363 struct fc_exch_mgr_anchor *ema;
2367 if (!lport || lport->state == LPORT_ST_DISABLED) {
2368 FC_LPORT_DBG(lport, "Receiving frames for an lport that "
2369 "has not been initialized correctly\n");
2374 f_ctl = ntoh24(fh->fh_f_ctl);
2375 ema = fc_find_ema(f_ctl, lport, fh);
2377 FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor,"
2378 "fc_ctl <0x%x>, xid <0x%x>\n",
2380 (f_ctl & FC_FC_EX_CTX) ?
2381 ntohs(fh->fh_ox_id) :
2382 ntohs(fh->fh_rx_id));
2388 * If frame is marked invalid, just drop it.
2390 switch (fr_eof(fp)) {
2392 if (f_ctl & FC_FC_END_SEQ)
2393 skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl));
2396 if (fh->fh_type == FC_TYPE_BLS)
2397 fc_exch_recv_bls(ema->mp, fp);
2398 else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
2400 fc_exch_recv_seq_resp(ema->mp, fp);
2401 else if (f_ctl & FC_FC_SEQ_CTX)
2402 fc_exch_recv_resp(ema->mp, fp);
2403 else /* no EX_CTX and no SEQ_CTX */
2404 fc_exch_recv_req(lport, ema->mp, fp);
2407 FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)",
2412 EXPORT_SYMBOL(fc_exch_recv);
2415 * fc_exch_init() - Initialize the exchange layer for a local port
2416 * @lport: The local port to initialize the exchange layer for
2418 int fc_exch_init(struct fc_lport *lport)
2420 if (!lport->tt.seq_start_next)
2421 lport->tt.seq_start_next = fc_seq_start_next;
2423 if (!lport->tt.seq_set_resp)
2424 lport->tt.seq_set_resp = fc_seq_set_resp;
2426 if (!lport->tt.exch_seq_send)
2427 lport->tt.exch_seq_send = fc_exch_seq_send;
2429 if (!lport->tt.seq_send)
2430 lport->tt.seq_send = fc_seq_send;
2432 if (!lport->tt.seq_els_rsp_send)
2433 lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send;
2435 if (!lport->tt.exch_done)
2436 lport->tt.exch_done = fc_exch_done;
2438 if (!lport->tt.exch_mgr_reset)
2439 lport->tt.exch_mgr_reset = fc_exch_mgr_reset;
2441 if (!lport->tt.seq_exch_abort)
2442 lport->tt.seq_exch_abort = fc_seq_exch_abort;
2444 if (!lport->tt.seq_assign)
2445 lport->tt.seq_assign = fc_seq_assign;
2447 if (!lport->tt.seq_release)
2448 lport->tt.seq_release = fc_seq_release;
2452 EXPORT_SYMBOL(fc_exch_init);
2455 * fc_setup_exch_mgr() - Setup an exchange manager
2457 int fc_setup_exch_mgr(void)
2459 fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch),
2460 0, SLAB_HWCACHE_ALIGN, NULL);
2465 * Initialize fc_cpu_mask and fc_cpu_order. The
2466 * fc_cpu_mask is set for nr_cpu_ids rounded up
2467 * to order of 2's * power and order is stored
2468 * in fc_cpu_order as this is later required in
2469 * mapping between an exch id and exch array index
2470 * in per cpu exch pool.
2472 * This round up is required to align fc_cpu_mask
2473 * to exchange id's lower bits such that all incoming
2474 * frames of an exchange gets delivered to the same
2475 * cpu on which exchange originated by simple bitwise
2476 * AND operation between fc_cpu_mask and exchange id.
2480 while (fc_cpu_mask < nr_cpu_ids) {
2486 fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue");
2487 if (!fc_exch_workqueue)
2491 kmem_cache_destroy(fc_em_cachep);
2496 * fc_destroy_exch_mgr() - Destroy an exchange manager
2498 void fc_destroy_exch_mgr(void)
2500 destroy_workqueue(fc_exch_workqueue);
2501 kmem_cache_destroy(fc_em_cachep);