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
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
30 #include <linux/slab.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_device.h>
36 #include <scsi/scsi_cmnd.h>
38 #include <scsi/fc/fc_fc2.h>
40 #include <scsi/libfc.h>
41 #include <scsi/fc_encode.h>
45 struct kmem_cache
*scsi_pkt_cachep
;
47 /* SRB state definitions */
48 #define FC_SRB_FREE 0 /* cmd is free */
49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
57 #define FC_SRB_READ (1 << 1)
58 #define FC_SRB_WRITE (1 << 0)
61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
63 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
64 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
65 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
66 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
67 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
70 * struct fc_fcp_internal - FCP layer internal data
71 * @scsi_pkt_pool: Memory pool to draw FCP packets from
72 * @scsi_queue_lock: Protects the scsi_pkt_queue
73 * @scsi_pkt_queue: Current FCP packets
74 * @last_can_queue_ramp_down_time: ramp down time
75 * @last_can_queue_ramp_up_time: ramp up time
76 * @max_can_queue: max can_queue size
78 struct fc_fcp_internal
{
79 mempool_t
*scsi_pkt_pool
;
80 spinlock_t scsi_queue_lock
;
81 struct list_head scsi_pkt_queue
;
82 unsigned long last_can_queue_ramp_down_time
;
83 unsigned long last_can_queue_ramp_up_time
;
87 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
91 * FC scsi I/O related functions
93 static void fc_fcp_recv_data(struct fc_fcp_pkt
*, struct fc_frame
*);
94 static void fc_fcp_recv(struct fc_seq
*, struct fc_frame
*, void *);
95 static void fc_fcp_resp(struct fc_fcp_pkt
*, struct fc_frame
*);
96 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*);
97 static void fc_tm_done(struct fc_seq
*, struct fc_frame
*, void *);
98 static void fc_fcp_error(struct fc_fcp_pkt
*, struct fc_frame
*);
99 static void fc_fcp_recovery(struct fc_fcp_pkt
*);
100 static void fc_fcp_timeout(unsigned long);
101 static void fc_fcp_rec(struct fc_fcp_pkt
*);
102 static void fc_fcp_rec_error(struct fc_fcp_pkt
*, struct fc_frame
*);
103 static void fc_fcp_rec_resp(struct fc_seq
*, struct fc_frame
*, void *);
104 static void fc_io_compl(struct fc_fcp_pkt
*);
106 static void fc_fcp_srr(struct fc_fcp_pkt
*, enum fc_rctl
, u32
);
107 static void fc_fcp_srr_resp(struct fc_seq
*, struct fc_frame
*, void *);
108 static void fc_fcp_srr_error(struct fc_fcp_pkt
*, struct fc_frame
*);
111 * command status codes
113 #define FC_COMPLETE 0
114 #define FC_CMD_ABORTED 1
115 #define FC_CMD_RESET 2
116 #define FC_CMD_PLOGO 3
118 #define FC_TRANS_ERR 5
119 #define FC_DATA_OVRRUN 6
120 #define FC_DATA_UNDRUN 7
122 #define FC_HRD_ERROR 9
123 #define FC_CMD_RECOVERY 10
126 * Error recovery timeout values.
128 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
129 #define FC_SCSI_TM_TOV (10 * HZ)
130 #define FC_SCSI_REC_TOV (2 * HZ)
131 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
132 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
134 #define FC_MAX_ERROR_CNT 5
135 #define FC_MAX_RECOV_RETRY 3
137 #define FC_FCP_DFLT_QUEUE_DEPTH 32
140 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
141 * @lport: The local port that the FCP packet is for
142 * @gfp: GFP flags for allocation
144 * Return value: fcp_pkt structure or null on allocation failure.
145 * Context: Can be called from process context, no lock is required.
147 static struct fc_fcp_pkt
*fc_fcp_pkt_alloc(struct fc_lport
*lport
, gfp_t gfp
)
149 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
150 struct fc_fcp_pkt
*fsp
;
152 fsp
= mempool_alloc(si
->scsi_pkt_pool
, gfp
);
154 memset(fsp
, 0, sizeof(*fsp
));
156 atomic_set(&fsp
->ref_cnt
, 1);
157 init_timer(&fsp
->timer
);
158 INIT_LIST_HEAD(&fsp
->list
);
159 spin_lock_init(&fsp
->scsi_pkt_lock
);
165 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
166 * @fsp: The FCP packet to be released
168 * Context: Can be called from process or interrupt context,
169 * no lock is required.
171 static void fc_fcp_pkt_release(struct fc_fcp_pkt
*fsp
)
173 if (atomic_dec_and_test(&fsp
->ref_cnt
)) {
174 struct fc_fcp_internal
*si
= fc_get_scsi_internal(fsp
->lp
);
176 mempool_free(fsp
, si
->scsi_pkt_pool
);
181 * fc_fcp_pkt_hold() - Hold a fcp_pkt
182 * @fsp: The FCP packet to be held
184 static void fc_fcp_pkt_hold(struct fc_fcp_pkt
*fsp
)
186 atomic_inc(&fsp
->ref_cnt
);
190 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
191 * @seq: The sequence that the FCP packet is on (required by destructor API)
192 * @fsp: The FCP packet to be released
194 * This routine is called by a destructor callback in the exch_seq_send()
195 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
196 * argument even though it is not used by this routine.
198 * Context: No locking required.
200 static void fc_fcp_pkt_destroy(struct fc_seq
*seq
, void *fsp
)
202 fc_fcp_pkt_release(fsp
);
206 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
207 * @fsp: The FCP packet to be locked and incremented
209 * We should only return error if we return a command to SCSI-ml before
210 * getting a response. This can happen in cases where we send a abort, but
211 * do not wait for the response and the abort and command can be passing
212 * each other on the wire/network-layer.
214 * Note: this function locks the packet and gets a reference to allow
215 * callers to call the completion function while the lock is held and
216 * not have to worry about the packets refcount.
218 * TODO: Maybe we should just have callers grab/release the lock and
219 * have a function that they call to verify the fsp and grab a ref if
222 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt
*fsp
)
224 spin_lock_bh(&fsp
->scsi_pkt_lock
);
225 if (fsp
->state
& FC_SRB_COMPL
) {
226 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
230 fc_fcp_pkt_hold(fsp
);
235 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
237 * @fsp: The FCP packet to be unlocked and decremented
239 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt
*fsp
)
241 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
242 fc_fcp_pkt_release(fsp
);
246 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
247 * @fsp: The FCP packet to start a timer for
248 * @delay: The timeout period for the timer
250 static void fc_fcp_timer_set(struct fc_fcp_pkt
*fsp
, unsigned long delay
)
252 if (!(fsp
->state
& FC_SRB_COMPL
))
253 mod_timer(&fsp
->timer
, jiffies
+ delay
);
257 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
259 * @fsp: The FCP packet to abort exchanges on
261 static int fc_fcp_send_abort(struct fc_fcp_pkt
*fsp
)
266 fsp
->state
|= FC_SRB_ABORT_PENDING
;
267 return fsp
->lp
->tt
.seq_exch_abort(fsp
->seq_ptr
, 0);
271 * fc_fcp_retry_cmd() - Retry a fcp_pkt
272 * @fsp: The FCP packet to be retried
274 * Sets the status code to be FC_ERROR and then calls
275 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
276 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
277 * The SCSI-ml will retry the command.
279 static void fc_fcp_retry_cmd(struct fc_fcp_pkt
*fsp
)
282 fsp
->lp
->tt
.exch_done(fsp
->seq_ptr
);
286 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
288 fsp
->status_code
= FC_ERROR
;
289 fc_fcp_complete_locked(fsp
);
293 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
294 * @fsp: The FCP packet that will manage the DDP frames
295 * @xid: The XID that will be used for the DDP exchange
297 void fc_fcp_ddp_setup(struct fc_fcp_pkt
*fsp
, u16 xid
)
299 struct fc_lport
*lport
;
302 if ((fsp
->req_flags
& FC_SRB_READ
) &&
303 (lport
->lro_enabled
) && (lport
->tt
.ddp_setup
)) {
304 if (lport
->tt
.ddp_setup(lport
, xid
, scsi_sglist(fsp
->cmd
),
305 scsi_sg_count(fsp
->cmd
)))
311 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
312 * DDP related resources for a fcp_pkt
313 * @fsp: The FCP packet that DDP had been used on
315 static void fc_fcp_ddp_done(struct fc_fcp_pkt
*fsp
)
317 struct fc_lport
*lport
;
322 if (fsp
->xfer_ddp
== FC_XID_UNKNOWN
)
326 if (lport
->tt
.ddp_done
) {
327 fsp
->xfer_len
= lport
->tt
.ddp_done(lport
, fsp
->xfer_ddp
);
328 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
333 * fc_fcp_can_queue_ramp_up() - increases can_queue
334 * @lport: lport to ramp up can_queue
336 * Locking notes: Called with Scsi_Host lock held
338 static void fc_fcp_can_queue_ramp_up(struct fc_lport
*lport
)
340 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
343 if (si
->last_can_queue_ramp_up_time
&&
344 (time_before(jiffies
, si
->last_can_queue_ramp_up_time
+
345 FC_CAN_QUEUE_PERIOD
)))
348 if (time_before(jiffies
, si
->last_can_queue_ramp_down_time
+
349 FC_CAN_QUEUE_PERIOD
))
352 si
->last_can_queue_ramp_up_time
= jiffies
;
354 can_queue
= lport
->host
->can_queue
<< 1;
355 if (can_queue
>= si
->max_can_queue
) {
356 can_queue
= si
->max_can_queue
;
357 si
->last_can_queue_ramp_down_time
= 0;
359 lport
->host
->can_queue
= can_queue
;
360 shost_printk(KERN_ERR
, lport
->host
, "libfc: increased "
361 "can_queue to %d.\n", can_queue
);
365 * fc_fcp_can_queue_ramp_down() - reduces can_queue
366 * @lport: lport to reduce can_queue
368 * If we are getting memory allocation failures, then we may
369 * be trying to execute too many commands. We let the running
370 * commands complete or timeout, then try again with a reduced
371 * can_queue. Eventually we will hit the point where we run
372 * on all reserved structs.
374 * Locking notes: Called with Scsi_Host lock held
376 static void fc_fcp_can_queue_ramp_down(struct fc_lport
*lport
)
378 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
381 if (si
->last_can_queue_ramp_down_time
&&
382 (time_before(jiffies
, si
->last_can_queue_ramp_down_time
+
383 FC_CAN_QUEUE_PERIOD
)))
386 si
->last_can_queue_ramp_down_time
= jiffies
;
388 can_queue
= lport
->host
->can_queue
;
392 lport
->host
->can_queue
= can_queue
;
393 shost_printk(KERN_ERR
, lport
->host
, "libfc: Could not allocate frame.\n"
394 "Reducing can_queue to %d.\n", can_queue
);
398 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
399 * @lport: fc lport struct
400 * @len: payload length
402 * Allocates fc_frame structure and buffer but if fails to allocate
403 * then reduce can_queue.
405 static inline struct fc_frame
*fc_fcp_frame_alloc(struct fc_lport
*lport
,
411 fp
= fc_frame_alloc(lport
, len
);
416 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
417 fc_fcp_can_queue_ramp_down(lport
);
418 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
423 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
424 * @fsp: The FCP packet the data is on
425 * @fp: The data frame
427 static void fc_fcp_recv_data(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
429 struct scsi_cmnd
*sc
= fsp
->cmd
;
430 struct fc_lport
*lport
= fsp
->lp
;
431 struct fcoe_dev_stats
*stats
;
432 struct fc_frame_header
*fh
;
439 struct scatterlist
*sg
;
442 fh
= fc_frame_header_get(fp
);
443 offset
= ntohl(fh
->fh_parm_offset
);
444 start_offset
= offset
;
445 len
= fr_len(fp
) - sizeof(*fh
);
446 buf
= fc_frame_payload_get(fp
, 0);
449 * if this I/O is ddped then clear it
450 * and initiate recovery since data
451 * frames are expected to be placed
452 * directly in that case.
454 if (fsp
->xfer_ddp
!= FC_XID_UNKNOWN
) {
455 fc_fcp_ddp_done(fsp
);
458 if (offset
+ len
> fsp
->data_len
) {
459 /* this should never happen */
460 if ((fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) &&
461 fc_frame_crc_check(fp
))
463 FC_FCP_DBG(fsp
, "data received past end. len %zx offset %zx "
464 "data_len %x\n", len
, offset
, fsp
->data_len
);
467 if (offset
!= fsp
->xfer_len
)
468 fsp
->state
|= FC_SRB_DISCONTIG
;
470 sg
= scsi_sglist(sc
);
471 nents
= scsi_sg_count(sc
);
473 if (!(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)) {
474 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
475 &offset
, KM_SOFTIRQ0
, NULL
);
477 crc
= crc32(~0, (u8
*) fh
, sizeof(*fh
));
478 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
479 &offset
, KM_SOFTIRQ0
, &crc
);
480 buf
= fc_frame_payload_get(fp
, 0);
482 crc
= crc32(crc
, buf
+ len
, 4 - (len
% 4));
484 if (~crc
!= le32_to_cpu(fr_crc(fp
))) {
486 stats
= per_cpu_ptr(lport
->dev_stats
, get_cpu());
487 stats
->ErrorFrames
++;
488 /* per cpu count, not total count, but OK for limit */
489 if (stats
->InvalidCRCCount
++ < 5)
490 printk(KERN_WARNING
"libfc: CRC error on data "
491 "frame for port (%6.6x)\n",
495 * Assume the frame is total garbage.
496 * We may have copied it over the good part
498 * If so, we need to retry the entire operation.
499 * Otherwise, ignore it.
501 if (fsp
->state
& FC_SRB_DISCONTIG
)
507 if (fsp
->xfer_contig_end
== start_offset
)
508 fsp
->xfer_contig_end
+= copy_len
;
509 fsp
->xfer_len
+= copy_len
;
512 * In the very rare event that this data arrived after the response
513 * and completes the transfer, call the completion handler.
515 if (unlikely(fsp
->state
& FC_SRB_RCV_STATUS
) &&
516 fsp
->xfer_len
== fsp
->data_len
- fsp
->scsi_resid
)
517 fc_fcp_complete_locked(fsp
);
520 fc_fcp_recovery(fsp
);
524 * fc_fcp_send_data() - Send SCSI data to a target
525 * @fsp: The FCP packet the data is on
526 * @sp: The sequence the data is to be sent on
527 * @offset: The starting offset for this data request
528 * @seq_blen: The burst length for this data request
530 * Called after receiving a Transfer Ready data descriptor.
531 * If the LLD is capable of sequence offload then send down the
532 * seq_blen amount of data in single frame, otherwise send
533 * multiple frames of the maximum frame payload supported by
536 static int fc_fcp_send_data(struct fc_fcp_pkt
*fsp
, struct fc_seq
*seq
,
537 size_t offset
, size_t seq_blen
)
540 struct scsi_cmnd
*sc
;
541 struct scatterlist
*sg
;
542 struct fc_frame
*fp
= NULL
;
543 struct fc_lport
*lport
= fsp
->lp
;
549 size_t frame_offset
, fh_parm_offset
;
554 int using_sg
= lport
->sg_supp
;
557 WARN_ON(seq_blen
<= 0);
558 if (unlikely(offset
+ seq_blen
> fsp
->data_len
)) {
559 /* this should never happen */
560 FC_FCP_DBG(fsp
, "xfer-ready past end. seq_blen %zx "
561 "offset %zx\n", seq_blen
, offset
);
562 fc_fcp_send_abort(fsp
);
564 } else if (offset
!= fsp
->xfer_len
) {
565 /* Out of Order Data Request - no problem, but unexpected. */
566 FC_FCP_DBG(fsp
, "xfer-ready non-contiguous. "
567 "seq_blen %zx offset %zx\n", seq_blen
, offset
);
571 * if LLD is capable of seq_offload then set transport
572 * burst length (t_blen) to seq_blen, otherwise set t_blen
573 * to max FC frame payload previously set in fsp->max_payload.
575 t_blen
= fsp
->max_payload
;
576 if (lport
->seq_offload
) {
577 t_blen
= min(seq_blen
, (size_t)lport
->lso_max
);
578 FC_FCP_DBG(fsp
, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
579 fsp
, seq_blen
, lport
->lso_max
, t_blen
);
583 t_blen
&= ~(512 - 1); /* round down to block size */
586 remaining
= seq_blen
;
587 fh_parm_offset
= frame_offset
= offset
;
589 seq
= lport
->tt
.seq_start_next(seq
);
590 f_ctl
= FC_FC_REL_OFF
;
593 sg
= scsi_sglist(sc
);
595 while (remaining
> 0 && sg
) {
596 if (offset
>= sg
->length
) {
597 offset
-= sg
->length
;
602 tlen
= min(t_blen
, remaining
);
605 * TODO. Temporary workaround. fc_seq_send() can't
606 * handle odd lengths in non-linear skbs.
607 * This will be the final fragment only.
611 fp
= fc_frame_alloc(lport
, using_sg
? 0 : tlen
);
615 data
= fc_frame_header_get(fp
) + 1;
616 fh_parm_offset
= frame_offset
;
617 fr_max_payload(fp
) = fsp
->max_payload
;
620 off
= offset
+ sg
->offset
;
621 sg_bytes
= min(tlen
, sg
->length
- offset
);
622 sg_bytes
= min(sg_bytes
,
623 (size_t) (PAGE_SIZE
- (off
& ~PAGE_MASK
)));
624 page
= sg_page(sg
) + (off
>> PAGE_SHIFT
);
627 skb_fill_page_desc(fp_skb(fp
),
628 skb_shinfo(fp_skb(fp
))->nr_frags
,
629 page
, off
& ~PAGE_MASK
, sg_bytes
);
630 fp_skb(fp
)->data_len
+= sg_bytes
;
631 fr_len(fp
) += sg_bytes
;
632 fp_skb(fp
)->truesize
+= PAGE_SIZE
;
635 * The scatterlist item may be bigger than PAGE_SIZE,
636 * but we must not cross pages inside the kmap.
638 page_addr
= kmap_atomic(page
, KM_SOFTIRQ0
);
639 memcpy(data
, (char *)page_addr
+ (off
& ~PAGE_MASK
),
641 kunmap_atomic(page_addr
, KM_SOFTIRQ0
);
645 frame_offset
+= sg_bytes
;
647 remaining
-= sg_bytes
;
649 if ((skb_shinfo(fp_skb(fp
))->nr_frags
< FC_FRAME_SG_LEN
) &&
654 * Send sequence with transfer sequence initiative in case
655 * this is last FCP frame of the sequence.
658 f_ctl
|= FC_FC_SEQ_INIT
| FC_FC_END_SEQ
;
660 ep
= fc_seq_exch(seq
);
661 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
662 FC_TYPE_FCP
, f_ctl
, fh_parm_offset
);
665 * send fragment using for a sequence.
667 error
= lport
->tt
.seq_send(lport
, seq
, fp
);
669 WARN_ON(1); /* send error should be rare */
670 fc_fcp_retry_cmd(fsp
);
675 fsp
->xfer_len
+= seq_blen
; /* premature count? */
680 * fc_fcp_abts_resp() - Send an ABTS response
681 * @fsp: The FCP packet that is being aborted
682 * @fp: The response frame
684 static void fc_fcp_abts_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
687 struct fc_ba_rjt
*brp
;
688 struct fc_frame_header
*fh
;
690 fh
= fc_frame_header_get(fp
);
691 switch (fh
->fh_r_ctl
) {
695 brp
= fc_frame_payload_get(fp
, sizeof(*brp
));
696 if (brp
&& brp
->br_reason
== FC_BA_RJT_LOG_ERR
)
701 * we will let the command timeout
702 * and scsi-ml recover in this case,
703 * therefore cleared the ba_done flag.
709 fsp
->state
|= FC_SRB_ABORTED
;
710 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
712 if (fsp
->wait_for_comp
)
713 complete(&fsp
->tm_done
);
715 fc_fcp_complete_locked(fsp
);
720 * fc_fcp_recv() - Reveive an FCP frame
721 * @seq: The sequence the frame is on
722 * @fp: The received frame
723 * @arg: The related FCP packet
725 * Context: Called from Soft IRQ context. Can not be called
726 * holding the FCP packet list lock.
728 static void fc_fcp_recv(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
730 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
731 struct fc_lport
*lport
= fsp
->lp
;
732 struct fc_frame_header
*fh
;
733 struct fcp_txrdy
*dd
;
738 fc_fcp_error(fsp
, fp
);
742 fh
= fc_frame_header_get(fp
);
743 r_ctl
= fh
->fh_r_ctl
;
745 if (lport
->state
!= LPORT_ST_READY
)
747 if (fc_fcp_lock_pkt(fsp
))
749 fsp
->last_pkt_time
= jiffies
;
751 if (fh
->fh_type
== FC_TYPE_BLS
) {
752 fc_fcp_abts_resp(fsp
, fp
);
756 if (fsp
->state
& (FC_SRB_ABORTED
| FC_SRB_ABORT_PENDING
))
759 if (r_ctl
== FC_RCTL_DD_DATA_DESC
) {
761 * received XFER RDY from the target
762 * need to send data to the target
764 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
765 dd
= fc_frame_payload_get(fp
, sizeof(*dd
));
768 rc
= fc_fcp_send_data(fsp
, seq
,
769 (size_t) ntohl(dd
->ft_data_ro
),
770 (size_t) ntohl(dd
->ft_burst_len
));
772 seq
->rec_data
= fsp
->xfer_len
;
773 } else if (r_ctl
== FC_RCTL_DD_SOL_DATA
) {
775 * received a DATA frame
776 * next we will copy the data to the system buffer
778 WARN_ON(fr_len(fp
) < sizeof(*fh
)); /* len may be 0 */
779 fc_fcp_recv_data(fsp
, fp
);
780 seq
->rec_data
= fsp
->xfer_contig_end
;
781 } else if (r_ctl
== FC_RCTL_DD_CMD_STATUS
) {
782 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
784 fc_fcp_resp(fsp
, fp
);
786 FC_FCP_DBG(fsp
, "unexpected frame. r_ctl %x\n", r_ctl
);
789 fc_fcp_unlock_pkt(fsp
);
795 * fc_fcp_resp() - Handler for FCP responses
796 * @fsp: The FCP packet the response is for
797 * @fp: The response frame
799 static void fc_fcp_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
801 struct fc_frame_header
*fh
;
802 struct fcp_resp
*fc_rp
;
803 struct fcp_resp_ext
*rp_ex
;
804 struct fcp_resp_rsp_info
*fc_rp_info
;
812 fh
= (struct fc_frame_header
*)fr_hdr(fp
);
813 if (unlikely(plen
< sizeof(*fh
) + sizeof(*fc_rp
)))
816 fc_rp
= (struct fcp_resp
*)(fh
+ 1);
817 fsp
->cdb_status
= fc_rp
->fr_status
;
818 flags
= fc_rp
->fr_flags
;
819 fsp
->scsi_comp_flags
= flags
;
820 expected_len
= fsp
->data_len
;
822 /* if ddp, update xfer len */
823 fc_fcp_ddp_done(fsp
);
825 if (unlikely((flags
& ~FCP_CONF_REQ
) || fc_rp
->fr_status
)) {
826 rp_ex
= (void *)(fc_rp
+ 1);
827 if (flags
& (FCP_RSP_LEN_VAL
| FCP_SNS_LEN_VAL
)) {
828 if (plen
< sizeof(*fc_rp
) + sizeof(*rp_ex
))
830 fc_rp_info
= (struct fcp_resp_rsp_info
*)(rp_ex
+ 1);
831 if (flags
& FCP_RSP_LEN_VAL
) {
832 respl
= ntohl(rp_ex
->fr_rsp_len
);
833 if (respl
!= sizeof(*fc_rp_info
))
835 if (fsp
->wait_for_comp
) {
836 /* Abuse cdb_status for rsp code */
837 fsp
->cdb_status
= fc_rp_info
->rsp_code
;
838 complete(&fsp
->tm_done
);
840 * tmfs will not have any scsi cmd so
846 if (flags
& FCP_SNS_LEN_VAL
) {
847 snsl
= ntohl(rp_ex
->fr_sns_len
);
848 if (snsl
> SCSI_SENSE_BUFFERSIZE
)
849 snsl
= SCSI_SENSE_BUFFERSIZE
;
850 memcpy(fsp
->cmd
->sense_buffer
,
851 (char *)fc_rp_info
+ respl
, snsl
);
854 if (flags
& (FCP_RESID_UNDER
| FCP_RESID_OVER
)) {
855 if (plen
< sizeof(*fc_rp
) + sizeof(rp_ex
->fr_resid
))
857 if (flags
& FCP_RESID_UNDER
) {
858 fsp
->scsi_resid
= ntohl(rp_ex
->fr_resid
);
860 * The cmnd->underflow is the minimum number of
861 * bytes that must be transfered for this
862 * command. Provided a sense condition is not
863 * present, make sure the actual amount
864 * transferred is at least the underflow value
867 if (!(flags
& FCP_SNS_LEN_VAL
) &&
868 (fc_rp
->fr_status
== 0) &&
869 (scsi_bufflen(fsp
->cmd
) -
870 fsp
->scsi_resid
) < fsp
->cmd
->underflow
)
872 expected_len
-= fsp
->scsi_resid
;
874 fsp
->status_code
= FC_ERROR
;
878 fsp
->state
|= FC_SRB_RCV_STATUS
;
881 * Check for missing or extra data frames.
883 if (unlikely(fsp
->xfer_len
!= expected_len
)) {
884 if (fsp
->xfer_len
< expected_len
) {
886 * Some data may be queued locally,
887 * Wait a at least one jiffy to see if it is delivered.
888 * If this expires without data, we may do SRR.
890 fc_fcp_timer_set(fsp
, 2);
893 fsp
->status_code
= FC_DATA_OVRRUN
;
894 FC_FCP_DBG(fsp
, "tgt %6.6x xfer len %zx greater than expected, "
895 "len %x, data len %x\n",
897 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
899 fc_fcp_complete_locked(fsp
);
903 FC_FCP_DBG(fsp
, "short FCP response. flags 0x%x len %u respl %u "
904 "snsl %u\n", flags
, fr_len(fp
), respl
, snsl
);
906 fsp
->status_code
= FC_ERROR
;
907 fc_fcp_complete_locked(fsp
);
911 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
913 * @fsp: The FCP packet to be completed
915 * This function may sleep if a timer is pending. The packet lock must be
916 * held, and the host lock must not be held.
918 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*fsp
)
920 struct fc_lport
*lport
= fsp
->lp
;
925 if (fsp
->state
& FC_SRB_ABORT_PENDING
)
928 if (fsp
->state
& FC_SRB_ABORTED
) {
929 if (!fsp
->status_code
)
930 fsp
->status_code
= FC_CMD_ABORTED
;
933 * Test for transport underrun, independent of response
936 if (fsp
->xfer_len
< fsp
->data_len
&& !fsp
->io_status
&&
937 (!(fsp
->scsi_comp_flags
& FCP_RESID_UNDER
) ||
938 fsp
->xfer_len
< fsp
->data_len
- fsp
->scsi_resid
)) {
939 fsp
->status_code
= FC_DATA_UNDRUN
;
947 if (unlikely(fsp
->scsi_comp_flags
& FCP_CONF_REQ
)) {
948 struct fc_frame
*conf_frame
;
951 csp
= lport
->tt
.seq_start_next(seq
);
952 conf_frame
= fc_fcp_frame_alloc(fsp
->lp
, 0);
954 f_ctl
= FC_FC_SEQ_INIT
;
955 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
956 ep
= fc_seq_exch(seq
);
957 fc_fill_fc_hdr(conf_frame
, FC_RCTL_DD_SOL_CTL
,
959 FC_TYPE_FCP
, f_ctl
, 0);
960 lport
->tt
.seq_send(lport
, csp
, conf_frame
);
963 lport
->tt
.exch_done(seq
);
969 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
970 * @fsp: The FCP packet whose exchanges should be canceled
971 * @error: The reason for the cancellation
973 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt
*fsp
, int error
)
975 struct fc_lport
*lport
= fsp
->lp
;
978 lport
->tt
.exch_done(fsp
->seq_ptr
);
981 fsp
->status_code
= error
;
985 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
986 * @lport: The local port whose exchanges should be canceled
987 * @id: The target's ID
989 * @error: The reason for cancellation
991 * If lun or id is -1, they are ignored.
993 static void fc_fcp_cleanup_each_cmd(struct fc_lport
*lport
, unsigned int id
,
994 unsigned int lun
, int error
)
996 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
997 struct fc_fcp_pkt
*fsp
;
998 struct scsi_cmnd
*sc_cmd
;
1001 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1003 list_for_each_entry(fsp
, &si
->scsi_pkt_queue
, list
) {
1005 if (id
!= -1 && scmd_id(sc_cmd
) != id
)
1008 if (lun
!= -1 && sc_cmd
->device
->lun
!= lun
)
1011 fc_fcp_pkt_hold(fsp
);
1012 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1014 if (!fc_fcp_lock_pkt(fsp
)) {
1015 fc_fcp_cleanup_cmd(fsp
, error
);
1017 fc_fcp_unlock_pkt(fsp
);
1020 fc_fcp_pkt_release(fsp
);
1021 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1023 * while we dropped the lock multiple pkts could
1024 * have been released, so we have to start over.
1028 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1032 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1033 * @lport: The local port whose exchanges are to be aborted
1035 static void fc_fcp_abort_io(struct fc_lport
*lport
)
1037 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_HRD_ERROR
);
1041 * fc_fcp_pkt_send() - Send a fcp_pkt
1042 * @lport: The local port to send the FCP packet on
1043 * @fsp: The FCP packet to send
1045 * Return: Zero for success and -1 for failure
1046 * Locks: Called without locks held
1048 static int fc_fcp_pkt_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
)
1050 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1051 unsigned long flags
;
1054 fsp
->cmd
->SCp
.ptr
= (char *)fsp
;
1055 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1056 fsp
->cdb_cmd
.fc_flags
= fsp
->req_flags
& ~FCP_CFL_LEN_MASK
;
1058 int_to_scsilun(fsp
->cmd
->device
->lun
,
1059 (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1060 memcpy(fsp
->cdb_cmd
.fc_cdb
, fsp
->cmd
->cmnd
, fsp
->cmd
->cmd_len
);
1062 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1063 list_add_tail(&fsp
->list
, &si
->scsi_pkt_queue
);
1064 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1065 rc
= lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_fcp_recv
);
1067 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1068 list_del(&fsp
->list
);
1069 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1076 * fc_fcp_cmd_send() - Send a FCP command
1077 * @lport: The local port to send the command on
1078 * @fsp: The FCP packet the command is on
1079 * @resp: The handler for the response
1081 static int fc_fcp_cmd_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1082 void (*resp
)(struct fc_seq
*,
1083 struct fc_frame
*fp
,
1086 struct fc_frame
*fp
;
1088 struct fc_rport
*rport
;
1089 struct fc_rport_libfc_priv
*rpriv
;
1090 const size_t len
= sizeof(fsp
->cdb_cmd
);
1093 if (fc_fcp_lock_pkt(fsp
))
1096 fp
= fc_fcp_frame_alloc(lport
, sizeof(fsp
->cdb_cmd
));
1102 memcpy(fc_frame_payload_get(fp
, len
), &fsp
->cdb_cmd
, len
);
1105 fsp
->max_payload
= rport
->maxframe_size
;
1106 rpriv
= rport
->dd_data
;
1108 fc_fill_fc_hdr(fp
, FC_RCTL_DD_UNSOL_CMD
, rport
->port_id
,
1109 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1112 seq
= lport
->tt
.exch_seq_send(lport
, fp
, resp
, fc_fcp_pkt_destroy
,
1118 fsp
->last_pkt_time
= jiffies
;
1120 fc_fcp_pkt_hold(fsp
); /* hold for fc_fcp_pkt_destroy */
1122 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1123 fc_fcp_timer_set(fsp
,
1124 (fsp
->tgt_flags
& FC_RP_FLAGS_REC_SUPPORTED
) ?
1125 FC_SCSI_REC_TOV
: FC_SCSI_ER_TIMEOUT
);
1127 fc_fcp_unlock_pkt(fsp
);
1132 * fc_fcp_error() - Handler for FCP layer errors
1133 * @fsp: The FCP packet the error is on
1134 * @fp: The frame that has errored
1136 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1138 int error
= PTR_ERR(fp
);
1140 if (fc_fcp_lock_pkt(fsp
))
1143 if (error
== -FC_EX_CLOSED
) {
1144 fc_fcp_retry_cmd(fsp
);
1149 * clear abort pending, because the lower layer
1150 * decided to force completion.
1152 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
1153 fsp
->status_code
= FC_CMD_PLOGO
;
1154 fc_fcp_complete_locked(fsp
);
1156 fc_fcp_unlock_pkt(fsp
);
1160 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1161 * @fsp: The FCP packet to abort on
1163 * Called to send an abort and then wait for abort completion
1165 static int fc_fcp_pkt_abort(struct fc_fcp_pkt
*fsp
)
1169 if (fc_fcp_send_abort(fsp
))
1172 init_completion(&fsp
->tm_done
);
1173 fsp
->wait_for_comp
= 1;
1175 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1176 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1177 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1178 fsp
->wait_for_comp
= 0;
1181 FC_FCP_DBG(fsp
, "target abort cmd failed\n");
1183 } else if (fsp
->state
& FC_SRB_ABORTED
) {
1184 FC_FCP_DBG(fsp
, "target abort cmd passed\n");
1186 fc_fcp_complete_locked(fsp
);
1193 * fc_lun_reset_send() - Send LUN reset command
1194 * @data: The FCP packet that identifies the LUN to be reset
1196 static void fc_lun_reset_send(unsigned long data
)
1198 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1199 struct fc_lport
*lport
= fsp
->lp
;
1200 if (lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_tm_done
)) {
1201 if (fsp
->recov_retry
++ >= FC_MAX_RECOV_RETRY
)
1203 if (fc_fcp_lock_pkt(fsp
))
1205 setup_timer(&fsp
->timer
, fc_lun_reset_send
, (unsigned long)fsp
);
1206 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1207 fc_fcp_unlock_pkt(fsp
);
1212 * fc_lun_reset() - Send a LUN RESET command to a device
1213 * and wait for the reply
1214 * @lport: The local port to sent the comand on
1215 * @fsp: The FCP packet that identifies the LUN to be reset
1216 * @id: The SCSI command ID
1217 * @lun: The LUN ID to be reset
1219 static int fc_lun_reset(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1220 unsigned int id
, unsigned int lun
)
1224 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1225 fsp
->cdb_cmd
.fc_tm_flags
= FCP_TMF_LUN_RESET
;
1226 int_to_scsilun(lun
, (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1228 fsp
->wait_for_comp
= 1;
1229 init_completion(&fsp
->tm_done
);
1231 fc_lun_reset_send((unsigned long)fsp
);
1234 * wait for completion of reset
1235 * after that make sure all commands are terminated
1237 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1239 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1240 fsp
->state
|= FC_SRB_COMPL
;
1241 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1243 del_timer_sync(&fsp
->timer
);
1245 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1247 lport
->tt
.exch_done(fsp
->seq_ptr
);
1248 fsp
->seq_ptr
= NULL
;
1250 fsp
->wait_for_comp
= 0;
1251 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1254 FC_SCSI_DBG(lport
, "lun reset failed\n");
1258 /* cdb_status holds the tmf's rsp code */
1259 if (fsp
->cdb_status
!= FCP_TMF_CMPL
)
1262 FC_SCSI_DBG(lport
, "lun reset to lun %u completed\n", lun
);
1263 fc_fcp_cleanup_each_cmd(lport
, id
, lun
, FC_CMD_ABORTED
);
1268 * fc_tm_done() - Task Managment response handler
1269 * @seq: The sequence that the response is on
1270 * @fp: The response frame
1271 * @arg: The FCP packet the response is for
1273 static void fc_tm_done(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1275 struct fc_fcp_pkt
*fsp
= arg
;
1276 struct fc_frame_header
*fh
;
1280 * If there is an error just let it timeout or wait
1281 * for TMF to be aborted if it timedout.
1283 * scsi-eh will escalate for when either happens.
1288 if (fc_fcp_lock_pkt(fsp
))
1292 * raced with eh timeout handler.
1294 if (!fsp
->seq_ptr
|| !fsp
->wait_for_comp
) {
1295 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1299 fh
= fc_frame_header_get(fp
);
1300 if (fh
->fh_type
!= FC_TYPE_BLS
)
1301 fc_fcp_resp(fsp
, fp
);
1302 fsp
->seq_ptr
= NULL
;
1303 fsp
->lp
->tt
.exch_done(seq
);
1305 fc_fcp_unlock_pkt(fsp
);
1309 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1310 * @lport: The local port to be cleaned up
1312 static void fc_fcp_cleanup(struct fc_lport
*lport
)
1314 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_ERROR
);
1318 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1319 * @data: The FCP packet that has timed out
1321 * If REC is supported then just issue it and return. The REC exchange will
1322 * complete or time out and recovery can continue at that point. Otherwise,
1323 * if the response has been received without all the data it has been
1324 * ER_TIMEOUT since the response was received. If the response has not been
1325 * received we see if data was received recently. If it has been then we
1326 * continue waiting, otherwise, we abort the command.
1328 static void fc_fcp_timeout(unsigned long data
)
1330 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1331 struct fc_rport
*rport
= fsp
->rport
;
1332 struct fc_rport_libfc_priv
*rpriv
= rport
->dd_data
;
1334 if (fc_fcp_lock_pkt(fsp
))
1337 if (fsp
->cdb_cmd
.fc_tm_flags
)
1340 fsp
->state
|= FC_SRB_FCP_PROCESSING_TMO
;
1342 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1344 else if (time_after_eq(fsp
->last_pkt_time
+ (FC_SCSI_ER_TIMEOUT
/ 2),
1346 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1347 else if (fsp
->state
& FC_SRB_RCV_STATUS
)
1348 fc_fcp_complete_locked(fsp
);
1350 fc_fcp_recovery(fsp
);
1351 fsp
->state
&= ~FC_SRB_FCP_PROCESSING_TMO
;
1353 fc_fcp_unlock_pkt(fsp
);
1357 * fc_fcp_rec() - Send a REC ELS request
1358 * @fsp: The FCP packet to send the REC request on
1360 static void fc_fcp_rec(struct fc_fcp_pkt
*fsp
)
1362 struct fc_lport
*lport
;
1363 struct fc_frame
*fp
;
1364 struct fc_rport
*rport
;
1365 struct fc_rport_libfc_priv
*rpriv
;
1369 rpriv
= rport
->dd_data
;
1370 if (!fsp
->seq_ptr
|| rpriv
->rp_state
!= RPORT_ST_READY
) {
1371 fsp
->status_code
= FC_HRD_ERROR
;
1373 fc_fcp_complete_locked(fsp
);
1376 fp
= fc_fcp_frame_alloc(lport
, sizeof(struct fc_els_rec
));
1380 fr_seq(fp
) = fsp
->seq_ptr
;
1381 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, rport
->port_id
,
1382 rpriv
->local_port
->port_id
, FC_TYPE_ELS
,
1384 if (lport
->tt
.elsct_send(lport
, rport
->port_id
, fp
, ELS_REC
,
1385 fc_fcp_rec_resp
, fsp
,
1386 jiffies_to_msecs(FC_SCSI_REC_TOV
))) {
1387 fc_fcp_pkt_hold(fsp
); /* hold while REC outstanding */
1391 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1392 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1394 fc_fcp_recovery(fsp
);
1398 * fc_fcp_rec_resp() - Handler for REC ELS responses
1399 * @seq: The sequence the response is on
1400 * @fp: The response frame
1401 * @arg: The FCP packet the response is on
1403 * If the response is a reject then the scsi layer will handle
1404 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1405 * set the timeout and return. If the I/O was completed then complete the
1406 * exchange and tell the SCSI layer.
1408 static void fc_fcp_rec_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1410 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
1411 struct fc_els_rec_acc
*recp
;
1412 struct fc_els_ls_rjt
*rjt
;
1416 enum dma_data_direction data_dir
;
1418 struct fc_rport_libfc_priv
*rpriv
;
1421 fc_fcp_rec_error(fsp
, fp
);
1425 if (fc_fcp_lock_pkt(fsp
))
1428 fsp
->recov_retry
= 0;
1429 opcode
= fc_frame_payload_op(fp
);
1430 if (opcode
== ELS_LS_RJT
) {
1431 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1432 switch (rjt
->er_reason
) {
1434 FC_FCP_DBG(fsp
, "device %x unexpected REC reject "
1435 "reason %d expl %d\n",
1436 fsp
->rport
->port_id
, rjt
->er_reason
,
1440 FC_FCP_DBG(fsp
, "device does not support REC\n");
1441 rpriv
= fsp
->rport
->dd_data
;
1443 * if we do not spport RECs or got some bogus
1444 * reason then resetup timer so we check for
1447 rpriv
->flags
&= ~FC_RP_FLAGS_REC_SUPPORTED
;
1448 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1453 * If no data transfer, the command frame got dropped
1454 * so we just retry. If data was transferred, we
1455 * lost the response but the target has no record,
1456 * so we abort and retry.
1458 if (rjt
->er_explan
== ELS_EXPL_OXID_RXID
&&
1459 fsp
->xfer_len
== 0) {
1460 fc_fcp_retry_cmd(fsp
);
1463 fc_fcp_recovery(fsp
);
1466 } else if (opcode
== ELS_LS_ACC
) {
1467 if (fsp
->state
& FC_SRB_ABORTED
)
1470 data_dir
= fsp
->cmd
->sc_data_direction
;
1471 recp
= fc_frame_payload_get(fp
, sizeof(*recp
));
1472 offset
= ntohl(recp
->reca_fc4value
);
1473 e_stat
= ntohl(recp
->reca_e_stat
);
1475 if (e_stat
& ESB_ST_COMPLETE
) {
1478 * The exchange is complete.
1480 * For output, we must've lost the response.
1481 * For input, all data must've been sent.
1482 * We lost may have lost the response
1483 * (and a confirmation was requested) and maybe
1486 * If all data received, send SRR
1487 * asking for response. If partial data received,
1488 * or gaps, SRR requests data at start of gap.
1489 * Recovery via SRR relies on in-order-delivery.
1491 if (data_dir
== DMA_TO_DEVICE
) {
1492 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1493 } else if (fsp
->xfer_contig_end
== offset
) {
1494 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1496 offset
= fsp
->xfer_contig_end
;
1497 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1499 fc_fcp_srr(fsp
, r_ctl
, offset
);
1500 } else if (e_stat
& ESB_ST_SEQ_INIT
) {
1503 * The remote port has the initiative, so just
1504 * keep waiting for it to complete.
1506 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1510 * The exchange is incomplete, we have seq. initiative.
1511 * Lost response with requested confirmation,
1512 * lost confirmation, lost transfer ready or
1515 * For output, if not all data was received, ask
1516 * for transfer ready to be repeated.
1518 * If we received or sent all the data, send SRR to
1521 * If we lost a response, we may have lost some read
1524 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1525 if (data_dir
== DMA_TO_DEVICE
) {
1526 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1527 if (offset
< fsp
->data_len
)
1528 r_ctl
= FC_RCTL_DD_DATA_DESC
;
1529 } else if (offset
== fsp
->xfer_contig_end
) {
1530 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1531 } else if (fsp
->xfer_contig_end
< offset
) {
1532 offset
= fsp
->xfer_contig_end
;
1534 fc_fcp_srr(fsp
, r_ctl
, offset
);
1538 fc_fcp_unlock_pkt(fsp
);
1540 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1545 * fc_fcp_rec_error() - Handler for REC errors
1546 * @fsp: The FCP packet the error is on
1547 * @fp: The REC frame
1549 static void fc_fcp_rec_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1551 int error
= PTR_ERR(fp
);
1553 if (fc_fcp_lock_pkt(fsp
))
1558 fc_fcp_retry_cmd(fsp
);
1562 FC_FCP_DBG(fsp
, "REC %p fid %6.6x error unexpected error %d\n",
1563 fsp
, fsp
->rport
->port_id
, error
);
1564 fsp
->status_code
= FC_CMD_PLOGO
;
1567 case -FC_EX_TIMEOUT
:
1569 * Assume REC or LS_ACC was lost.
1570 * The exchange manager will have aborted REC, so retry.
1572 FC_FCP_DBG(fsp
, "REC fid %6.6x error error %d retry %d/%d\n",
1573 fsp
->rport
->port_id
, error
, fsp
->recov_retry
,
1574 FC_MAX_RECOV_RETRY
);
1575 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1578 fc_fcp_recovery(fsp
);
1581 fc_fcp_unlock_pkt(fsp
);
1583 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1587 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1588 * @fsp: The FCP pkt that needs to be aborted
1590 static void fc_fcp_recovery(struct fc_fcp_pkt
*fsp
)
1592 fsp
->status_code
= FC_CMD_RECOVERY
;
1593 fsp
->cdb_status
= 0;
1596 * if this fails then we let the scsi command timer fire and
1599 fc_fcp_send_abort(fsp
);
1603 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1604 * @fsp: The FCP packet the SRR is to be sent on
1605 * @r_ctl: The R_CTL field for the SRR request
1606 * This is called after receiving status but insufficient data, or
1607 * when expecting status but the request has timed out.
1609 static void fc_fcp_srr(struct fc_fcp_pkt
*fsp
, enum fc_rctl r_ctl
, u32 offset
)
1611 struct fc_lport
*lport
= fsp
->lp
;
1612 struct fc_rport
*rport
;
1613 struct fc_rport_libfc_priv
*rpriv
;
1614 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1616 struct fcp_srr
*srr
;
1617 struct fc_frame
*fp
;
1621 rpriv
= rport
->dd_data
;
1622 cdb_op
= fsp
->cdb_cmd
.fc_cdb
[0];
1624 if (!(rpriv
->flags
& FC_RP_FLAGS_RETRY
) ||
1625 rpriv
->rp_state
!= RPORT_ST_READY
)
1626 goto retry
; /* shouldn't happen */
1627 fp
= fc_fcp_frame_alloc(lport
, sizeof(*srr
));
1631 srr
= fc_frame_payload_get(fp
, sizeof(*srr
));
1632 memset(srr
, 0, sizeof(*srr
));
1633 srr
->srr_op
= ELS_SRR
;
1634 srr
->srr_ox_id
= htons(ep
->oxid
);
1635 srr
->srr_rx_id
= htons(ep
->rxid
);
1636 srr
->srr_r_ctl
= r_ctl
;
1637 srr
->srr_rel_off
= htonl(offset
);
1639 fc_fill_fc_hdr(fp
, FC_RCTL_ELS4_REQ
, rport
->port_id
,
1640 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1643 seq
= lport
->tt
.exch_seq_send(lport
, fp
, fc_fcp_srr_resp
, NULL
,
1644 fsp
, jiffies_to_msecs(FC_SCSI_REC_TOV
));
1648 fsp
->recov_seq
= seq
;
1649 fsp
->xfer_len
= offset
;
1650 fsp
->xfer_contig_end
= offset
;
1651 fsp
->state
&= ~FC_SRB_RCV_STATUS
;
1652 fc_fcp_pkt_hold(fsp
); /* hold for outstanding SRR */
1655 fc_fcp_retry_cmd(fsp
);
1659 * fc_fcp_srr_resp() - Handler for SRR response
1660 * @seq: The sequence the SRR is on
1661 * @fp: The SRR frame
1662 * @arg: The FCP packet the SRR is on
1664 static void fc_fcp_srr_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1666 struct fc_fcp_pkt
*fsp
= arg
;
1667 struct fc_frame_header
*fh
;
1670 fc_fcp_srr_error(fsp
, fp
);
1674 if (fc_fcp_lock_pkt(fsp
))
1677 fh
= fc_frame_header_get(fp
);
1679 * BUG? fc_fcp_srr_error calls exch_done which would release
1680 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1681 * then fc_exch_timeout would be sending an abort. The exch_done
1682 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1683 * an abort response though.
1685 if (fh
->fh_type
== FC_TYPE_BLS
) {
1686 fc_fcp_unlock_pkt(fsp
);
1690 fsp
->recov_seq
= NULL
;
1691 switch (fc_frame_payload_op(fp
)) {
1693 fsp
->recov_retry
= 0;
1694 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1698 fc_fcp_recovery(fsp
);
1701 fc_fcp_unlock_pkt(fsp
);
1702 fsp
->lp
->tt
.exch_done(seq
);
1705 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1709 * fc_fcp_srr_error() - Handler for SRR errors
1710 * @fsp: The FCP packet that the SRR error is on
1711 * @fp: The SRR frame
1713 static void fc_fcp_srr_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1715 if (fc_fcp_lock_pkt(fsp
))
1717 fsp
->lp
->tt
.exch_done(fsp
->recov_seq
);
1718 fsp
->recov_seq
= NULL
;
1719 switch (PTR_ERR(fp
)) {
1720 case -FC_EX_TIMEOUT
:
1721 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1724 fc_fcp_recovery(fsp
);
1726 case -FC_EX_CLOSED
: /* e.g., link failure */
1729 fc_fcp_retry_cmd(fsp
);
1732 fc_fcp_unlock_pkt(fsp
);
1734 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1738 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1739 * @lport: The local port to be checked
1741 static inline int fc_fcp_lport_queue_ready(struct fc_lport
*lport
)
1744 return (lport
->state
== LPORT_ST_READY
) &&
1745 lport
->link_up
&& !lport
->qfull
;
1749 * fc_queuecommand() - The queuecommand function of the SCSI template
1750 * @cmd: The scsi_cmnd to be executed
1751 * @done: The callback function to be called when the scsi_cmnd is complete
1753 * This is the i/o strategy routine, called by the SCSI layer. This routine
1754 * is called with the host_lock held.
1756 static int fc_queuecommand_lck(struct scsi_cmnd
*sc_cmd
, void (*done
)(struct scsi_cmnd
*))
1758 struct fc_lport
*lport
;
1759 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1760 struct fc_fcp_pkt
*fsp
;
1761 struct fc_rport_libfc_priv
*rpriv
;
1764 struct fcoe_dev_stats
*stats
;
1766 lport
= shost_priv(sc_cmd
->device
->host
);
1768 rval
= fc_remote_port_chkready(rport
);
1770 sc_cmd
->result
= rval
;
1774 spin_unlock_irq(lport
->host
->host_lock
);
1776 if (!*(struct fc_remote_port
**)rport
->dd_data
) {
1778 * rport is transitioning from blocked/deleted to
1781 sc_cmd
->result
= DID_IMM_RETRY
<< 16;
1786 rpriv
= rport
->dd_data
;
1788 if (!fc_fcp_lport_queue_ready(lport
)) {
1790 fc_fcp_can_queue_ramp_down(lport
);
1791 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1795 fsp
= fc_fcp_pkt_alloc(lport
, GFP_ATOMIC
);
1797 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1802 * build the libfc request pkt
1804 fsp
->cmd
= sc_cmd
; /* save the cmd */
1805 fsp
->lp
= lport
; /* save the softc ptr */
1806 fsp
->rport
= rport
; /* set the remote port ptr */
1807 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
1808 sc_cmd
->scsi_done
= done
;
1811 * set up the transfer length
1813 fsp
->data_len
= scsi_bufflen(sc_cmd
);
1817 * setup the data direction
1819 stats
= per_cpu_ptr(lport
->dev_stats
, get_cpu());
1820 if (sc_cmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
1821 fsp
->req_flags
= FC_SRB_READ
;
1822 stats
->InputRequests
++;
1823 stats
->InputMegabytes
= fsp
->data_len
;
1824 } else if (sc_cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1825 fsp
->req_flags
= FC_SRB_WRITE
;
1826 stats
->OutputRequests
++;
1827 stats
->OutputMegabytes
= fsp
->data_len
;
1830 stats
->ControlRequests
++;
1834 fsp
->tgt_flags
= rpriv
->flags
;
1836 init_timer(&fsp
->timer
);
1837 fsp
->timer
.data
= (unsigned long)fsp
;
1840 * send it to the lower layer
1841 * if we get -1 return then put the request in the pending
1844 rval
= fc_fcp_pkt_send(lport
, fsp
);
1846 fsp
->state
= FC_SRB_FREE
;
1847 fc_fcp_pkt_release(fsp
);
1848 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1851 spin_lock_irq(lport
->host
->host_lock
);
1855 DEF_SCSI_QCMD(fc_queuecommand
)
1856 EXPORT_SYMBOL(fc_queuecommand
);
1859 * fc_io_compl() - Handle responses for completed commands
1860 * @fsp: The FCP packet that is complete
1862 * Translates fcp_pkt errors to a Linux SCSI errors.
1863 * The fcp packet lock must be held when calling.
1865 static void fc_io_compl(struct fc_fcp_pkt
*fsp
)
1867 struct fc_fcp_internal
*si
;
1868 struct scsi_cmnd
*sc_cmd
;
1869 struct fc_lport
*lport
;
1870 unsigned long flags
;
1872 /* release outstanding ddp context */
1873 fc_fcp_ddp_done(fsp
);
1875 fsp
->state
|= FC_SRB_COMPL
;
1876 if (!(fsp
->state
& FC_SRB_FCP_PROCESSING_TMO
)) {
1877 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1878 del_timer_sync(&fsp
->timer
);
1879 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1883 si
= fc_get_scsi_internal(lport
);
1886 * if can_queue ramp down is done then try can_queue ramp up
1887 * since commands are completing now.
1889 if (si
->last_can_queue_ramp_down_time
)
1890 fc_fcp_can_queue_ramp_up(lport
);
1893 CMD_SCSI_STATUS(sc_cmd
) = fsp
->cdb_status
;
1894 switch (fsp
->status_code
) {
1896 if (fsp
->cdb_status
== 0) {
1900 sc_cmd
->result
= DID_OK
<< 16;
1901 if (fsp
->scsi_resid
)
1902 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1905 * transport level I/O was ok but scsi
1906 * has non zero status
1908 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
1912 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1913 "due to FC_ERROR\n");
1914 sc_cmd
->result
= DID_ERROR
<< 16;
1916 case FC_DATA_UNDRUN
:
1917 if ((fsp
->cdb_status
== 0) && !(fsp
->req_flags
& FC_SRB_READ
)) {
1919 * scsi status is good but transport level
1922 if (fsp
->state
& FC_SRB_RCV_STATUS
) {
1923 sc_cmd
->result
= DID_OK
<< 16;
1925 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml"
1926 " due to FC_DATA_UNDRUN (trans)\n");
1927 sc_cmd
->result
= DID_ERROR
<< 16;
1931 * scsi got underrun, this is an error
1933 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1934 "due to FC_DATA_UNDRUN (scsi)\n");
1935 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1936 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1939 case FC_DATA_OVRRUN
:
1941 * overrun is an error
1943 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1944 "due to FC_DATA_OVRRUN\n");
1945 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1947 case FC_CMD_ABORTED
:
1948 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1949 "due to FC_CMD_ABORTED\n");
1950 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->io_status
;
1952 case FC_CMD_RECOVERY
:
1953 sc_cmd
->result
= (DID_BUS_BUSY
<< 16) | fsp
->io_status
;
1956 sc_cmd
->result
= (DID_RESET
<< 16);
1959 sc_cmd
->result
= (DID_NO_CONNECT
<< 16);
1962 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1963 "due to unknown error\n");
1964 sc_cmd
->result
= (DID_ERROR
<< 16);
1968 if (lport
->state
!= LPORT_ST_READY
&& fsp
->status_code
!= FC_COMPLETE
)
1969 sc_cmd
->result
= (DID_TRANSPORT_DISRUPTED
<< 16);
1971 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1972 list_del(&fsp
->list
);
1973 sc_cmd
->SCp
.ptr
= NULL
;
1974 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1975 sc_cmd
->scsi_done(sc_cmd
);
1977 /* release ref from initial allocation in queue command */
1978 fc_fcp_pkt_release(fsp
);
1982 * fc_eh_abort() - Abort a command
1983 * @sc_cmd: The SCSI command to abort
1985 * From SCSI host template.
1986 * Send an ABTS to the target device and wait for the response.
1988 int fc_eh_abort(struct scsi_cmnd
*sc_cmd
)
1990 struct fc_fcp_pkt
*fsp
;
1991 struct fc_lport
*lport
;
1992 struct fc_fcp_internal
*si
;
1994 unsigned long flags
;
1996 lport
= shost_priv(sc_cmd
->device
->host
);
1997 if (lport
->state
!= LPORT_ST_READY
)
1999 else if (!lport
->link_up
)
2002 si
= fc_get_scsi_internal(lport
);
2003 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
2004 fsp
= CMD_SP(sc_cmd
);
2006 /* command completed while scsi eh was setting up */
2007 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
2010 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2011 fc_fcp_pkt_hold(fsp
);
2012 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
2014 if (fc_fcp_lock_pkt(fsp
)) {
2015 /* completed while we were waiting for timer to be deleted */
2020 rc
= fc_fcp_pkt_abort(fsp
);
2021 fc_fcp_unlock_pkt(fsp
);
2024 fc_fcp_pkt_release(fsp
);
2027 EXPORT_SYMBOL(fc_eh_abort
);
2030 * fc_eh_device_reset() - Reset a single LUN
2031 * @sc_cmd: The SCSI command which identifies the device whose
2032 * LUN is to be reset
2034 * Set from SCSI host template.
2036 int fc_eh_device_reset(struct scsi_cmnd
*sc_cmd
)
2038 struct fc_lport
*lport
;
2039 struct fc_fcp_pkt
*fsp
;
2040 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
2044 rval
= fc_remote_port_chkready(rport
);
2048 lport
= shost_priv(sc_cmd
->device
->host
);
2050 if (lport
->state
!= LPORT_ST_READY
)
2053 FC_SCSI_DBG(lport
, "Resetting rport (%6.6x)\n", rport
->port_id
);
2055 fsp
= fc_fcp_pkt_alloc(lport
, GFP_NOIO
);
2057 printk(KERN_WARNING
"libfc: could not allocate scsi_pkt\n");
2062 * Build the libfc request pkt. Do not set the scsi cmnd, because
2063 * the sc passed in is not setup for execution like when sent
2064 * through the queuecommand callout.
2066 fsp
->lp
= lport
; /* save the softc ptr */
2067 fsp
->rport
= rport
; /* set the remote port ptr */
2070 * flush outstanding commands
2072 rc
= fc_lun_reset(lport
, fsp
, scmd_id(sc_cmd
), sc_cmd
->device
->lun
);
2073 fsp
->state
= FC_SRB_FREE
;
2074 fc_fcp_pkt_release(fsp
);
2079 EXPORT_SYMBOL(fc_eh_device_reset
);
2082 * fc_eh_host_reset() - Reset a Scsi_Host.
2083 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2085 int fc_eh_host_reset(struct scsi_cmnd
*sc_cmd
)
2087 struct Scsi_Host
*shost
= sc_cmd
->device
->host
;
2088 struct fc_lport
*lport
= shost_priv(shost
);
2089 unsigned long wait_tmo
;
2091 FC_SCSI_DBG(lport
, "Resetting host\n");
2093 lport
->tt
.lport_reset(lport
);
2094 wait_tmo
= jiffies
+ FC_HOST_RESET_TIMEOUT
;
2095 while (!fc_fcp_lport_queue_ready(lport
) && time_before(jiffies
,
2099 if (fc_fcp_lport_queue_ready(lport
)) {
2100 shost_printk(KERN_INFO
, shost
, "libfc: Host reset succeeded "
2101 "on port (%6.6x)\n", lport
->port_id
);
2104 shost_printk(KERN_INFO
, shost
, "libfc: Host reset failed, "
2105 "port (%6.6x) is not ready.\n",
2110 EXPORT_SYMBOL(fc_eh_host_reset
);
2113 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2114 * @sdev: The SCSI device that identifies the SCSI host
2116 * Configures queue depth based on host's cmd_per_len. If not set
2117 * then we use the libfc default.
2119 int fc_slave_alloc(struct scsi_device
*sdev
)
2121 struct fc_rport
*rport
= starget_to_rport(scsi_target(sdev
));
2123 if (!rport
|| fc_remote_port_chkready(rport
))
2126 if (sdev
->tagged_supported
)
2127 scsi_activate_tcq(sdev
, FC_FCP_DFLT_QUEUE_DEPTH
);
2129 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
),
2130 FC_FCP_DFLT_QUEUE_DEPTH
);
2134 EXPORT_SYMBOL(fc_slave_alloc
);
2137 * fc_change_queue_depth() - Change a device's queue depth
2138 * @sdev: The SCSI device whose queue depth is to change
2139 * @qdepth: The new queue depth
2140 * @reason: The resason for the change
2142 int fc_change_queue_depth(struct scsi_device
*sdev
, int qdepth
, int reason
)
2145 case SCSI_QDEPTH_DEFAULT
:
2146 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2148 case SCSI_QDEPTH_QFULL
:
2149 scsi_track_queue_full(sdev
, qdepth
);
2151 case SCSI_QDEPTH_RAMP_UP
:
2152 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2157 return sdev
->queue_depth
;
2159 EXPORT_SYMBOL(fc_change_queue_depth
);
2162 * fc_change_queue_type() - Change a device's queue type
2163 * @sdev: The SCSI device whose queue depth is to change
2164 * @tag_type: Identifier for queue type
2166 int fc_change_queue_type(struct scsi_device
*sdev
, int tag_type
)
2168 if (sdev
->tagged_supported
) {
2169 scsi_set_tag_type(sdev
, tag_type
);
2171 scsi_activate_tcq(sdev
, sdev
->queue_depth
);
2173 scsi_deactivate_tcq(sdev
, sdev
->queue_depth
);
2179 EXPORT_SYMBOL(fc_change_queue_type
);
2182 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2183 * @lport: The local port that no longer needs the FCP layer
2185 void fc_fcp_destroy(struct fc_lport
*lport
)
2187 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
2189 if (!list_empty(&si
->scsi_pkt_queue
))
2190 printk(KERN_ERR
"libfc: Leaked SCSI packets when destroying "
2191 "port (%6.6x)\n", lport
->port_id
);
2193 mempool_destroy(si
->scsi_pkt_pool
);
2195 lport
->scsi_priv
= NULL
;
2197 EXPORT_SYMBOL(fc_fcp_destroy
);
2203 scsi_pkt_cachep
= kmem_cache_create("libfc_fcp_pkt",
2204 sizeof(struct fc_fcp_pkt
),
2205 0, SLAB_HWCACHE_ALIGN
, NULL
);
2206 if (!scsi_pkt_cachep
) {
2207 printk(KERN_ERR
"libfc: Unable to allocate SRB cache, "
2208 "module load failed!");
2215 void fc_destroy_fcp()
2217 if (scsi_pkt_cachep
)
2218 kmem_cache_destroy(scsi_pkt_cachep
);
2222 * fc_fcp_init() - Initialize the FCP layer for a local port
2223 * @lport: The local port to initialize the exchange layer for
2225 int fc_fcp_init(struct fc_lport
*lport
)
2228 struct fc_fcp_internal
*si
;
2230 if (!lport
->tt
.fcp_cmd_send
)
2231 lport
->tt
.fcp_cmd_send
= fc_fcp_cmd_send
;
2233 if (!lport
->tt
.fcp_cleanup
)
2234 lport
->tt
.fcp_cleanup
= fc_fcp_cleanup
;
2236 if (!lport
->tt
.fcp_abort_io
)
2237 lport
->tt
.fcp_abort_io
= fc_fcp_abort_io
;
2239 si
= kzalloc(sizeof(struct fc_fcp_internal
), GFP_KERNEL
);
2242 lport
->scsi_priv
= si
;
2243 si
->max_can_queue
= lport
->host
->can_queue
;
2244 INIT_LIST_HEAD(&si
->scsi_pkt_queue
);
2245 spin_lock_init(&si
->scsi_queue_lock
);
2247 si
->scsi_pkt_pool
= mempool_create_slab_pool(2, scsi_pkt_cachep
);
2248 if (!si
->scsi_pkt_pool
) {
2258 EXPORT_SYMBOL(fc_fcp_init
);