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>
31 #include <scsi/scsi_tcq.h>
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_cmnd.h>
37 #include <scsi/fc/fc_fc2.h>
39 #include <scsi/libfc.h>
40 #include <scsi/fc_encode.h>
44 struct kmem_cache
*scsi_pkt_cachep
;
46 /* SRB state definitions */
47 #define FC_SRB_FREE 0 /* cmd is free */
48 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
49 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
50 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
51 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
52 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
53 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
54 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
56 #define FC_SRB_READ (1 << 1)
57 #define FC_SRB_WRITE (1 << 0)
60 * The SCp.ptr should be tested and set under the host lock. NULL indicates
61 * that the command has been retruned to the scsi layer.
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_timeout_error(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_TIME_OUT 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);
448 /* if this I/O is ddped, update xfer len */
449 fc_fcp_ddp_done(fsp
);
451 if (offset
+ len
> fsp
->data_len
) {
452 /* this should never happen */
453 if ((fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) &&
454 fc_frame_crc_check(fp
))
456 FC_FCP_DBG(fsp
, "data received past end. len %zx offset %zx "
457 "data_len %x\n", len
, offset
, fsp
->data_len
);
458 fc_fcp_retry_cmd(fsp
);
461 if (offset
!= fsp
->xfer_len
)
462 fsp
->state
|= FC_SRB_DISCONTIG
;
464 sg
= scsi_sglist(sc
);
465 nents
= scsi_sg_count(sc
);
467 if (!(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)) {
468 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
469 &offset
, KM_SOFTIRQ0
, NULL
);
471 crc
= crc32(~0, (u8
*) fh
, sizeof(*fh
));
472 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
473 &offset
, KM_SOFTIRQ0
, &crc
);
474 buf
= fc_frame_payload_get(fp
, 0);
476 crc
= crc32(crc
, buf
+ len
, 4 - (len
% 4));
478 if (~crc
!= le32_to_cpu(fr_crc(fp
))) {
480 stats
= fc_lport_get_stats(lport
);
481 stats
->ErrorFrames
++;
482 /* FIXME - per cpu count, not total count! */
483 if (stats
->InvalidCRCCount
++ < 5)
484 printk(KERN_WARNING
"libfc: CRC error on data "
485 "frame for port (%6x)\n",
486 fc_host_port_id(lport
->host
));
488 * Assume the frame is total garbage.
489 * We may have copied it over the good part
491 * If so, we need to retry the entire operation.
492 * Otherwise, ignore it.
494 if (fsp
->state
& FC_SRB_DISCONTIG
)
495 fc_fcp_retry_cmd(fsp
);
500 if (fsp
->xfer_contig_end
== start_offset
)
501 fsp
->xfer_contig_end
+= copy_len
;
502 fsp
->xfer_len
+= copy_len
;
505 * In the very rare event that this data arrived after the response
506 * and completes the transfer, call the completion handler.
508 if (unlikely(fsp
->state
& FC_SRB_RCV_STATUS
) &&
509 fsp
->xfer_len
== fsp
->data_len
- fsp
->scsi_resid
)
510 fc_fcp_complete_locked(fsp
);
514 * fc_fcp_send_data() - Send SCSI data to a target
515 * @fsp: The FCP packet the data is on
516 * @sp: The sequence the data is to be sent on
517 * @offset: The starting offset for this data request
518 * @seq_blen: The burst length for this data request
520 * Called after receiving a Transfer Ready data descriptor.
521 * If the LLD is capable of sequence offload then send down the
522 * seq_blen amount of data in single frame, otherwise send
523 * multiple frames of the maximum frame payload supported by
526 static int fc_fcp_send_data(struct fc_fcp_pkt
*fsp
, struct fc_seq
*seq
,
527 size_t offset
, size_t seq_blen
)
530 struct scsi_cmnd
*sc
;
531 struct scatterlist
*sg
;
532 struct fc_frame
*fp
= NULL
;
533 struct fc_lport
*lport
= fsp
->lp
;
539 size_t frame_offset
, fh_parm_offset
;
544 int using_sg
= lport
->sg_supp
;
547 WARN_ON(seq_blen
<= 0);
548 if (unlikely(offset
+ seq_blen
> fsp
->data_len
)) {
549 /* this should never happen */
550 FC_FCP_DBG(fsp
, "xfer-ready past end. seq_blen %zx "
551 "offset %zx\n", seq_blen
, offset
);
552 fc_fcp_send_abort(fsp
);
554 } else if (offset
!= fsp
->xfer_len
) {
555 /* Out of Order Data Request - no problem, but unexpected. */
556 FC_FCP_DBG(fsp
, "xfer-ready non-contiguous. "
557 "seq_blen %zx offset %zx\n", seq_blen
, offset
);
561 * if LLD is capable of seq_offload then set transport
562 * burst length (t_blen) to seq_blen, otherwise set t_blen
563 * to max FC frame payload previously set in fsp->max_payload.
565 t_blen
= fsp
->max_payload
;
566 if (lport
->seq_offload
) {
567 t_blen
= min(seq_blen
, (size_t)lport
->lso_max
);
568 FC_FCP_DBG(fsp
, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
569 fsp
, seq_blen
, lport
->lso_max
, t_blen
);
572 WARN_ON(t_blen
< FC_MIN_MAX_PAYLOAD
);
574 t_blen
&= ~(512 - 1); /* round down to block size */
575 WARN_ON(t_blen
< FC_MIN_MAX_PAYLOAD
); /* won't go below 256 */
578 remaining
= seq_blen
;
579 fh_parm_offset
= frame_offset
= offset
;
581 seq
= lport
->tt
.seq_start_next(seq
);
582 f_ctl
= FC_FC_REL_OFF
;
585 sg
= scsi_sglist(sc
);
587 while (remaining
> 0 && sg
) {
588 if (offset
>= sg
->length
) {
589 offset
-= sg
->length
;
594 tlen
= min(t_blen
, remaining
);
597 * TODO. Temporary workaround. fc_seq_send() can't
598 * handle odd lengths in non-linear skbs.
599 * This will be the final fragment only.
603 fp
= fc_frame_alloc(lport
, using_sg
? 0 : tlen
);
607 data
= fc_frame_header_get(fp
) + 1;
608 fh_parm_offset
= frame_offset
;
609 fr_max_payload(fp
) = fsp
->max_payload
;
612 off
= offset
+ sg
->offset
;
613 sg_bytes
= min(tlen
, sg
->length
- offset
);
614 sg_bytes
= min(sg_bytes
,
615 (size_t) (PAGE_SIZE
- (off
& ~PAGE_MASK
)));
616 page
= sg_page(sg
) + (off
>> PAGE_SHIFT
);
619 skb_fill_page_desc(fp_skb(fp
),
620 skb_shinfo(fp_skb(fp
))->nr_frags
,
621 page
, off
& ~PAGE_MASK
, sg_bytes
);
622 fp_skb(fp
)->data_len
+= sg_bytes
;
623 fr_len(fp
) += sg_bytes
;
624 fp_skb(fp
)->truesize
+= PAGE_SIZE
;
627 * The scatterlist item may be bigger than PAGE_SIZE,
628 * but we must not cross pages inside the kmap.
630 page_addr
= kmap_atomic(page
, KM_SOFTIRQ0
);
631 memcpy(data
, (char *)page_addr
+ (off
& ~PAGE_MASK
),
633 kunmap_atomic(page_addr
, KM_SOFTIRQ0
);
637 frame_offset
+= sg_bytes
;
639 remaining
-= sg_bytes
;
641 if ((skb_shinfo(fp_skb(fp
))->nr_frags
< FC_FRAME_SG_LEN
) &&
646 * Send sequence with transfer sequence initiative in case
647 * this is last FCP frame of the sequence.
650 f_ctl
|= FC_FC_SEQ_INIT
| FC_FC_END_SEQ
;
652 ep
= fc_seq_exch(seq
);
653 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
654 FC_TYPE_FCP
, f_ctl
, fh_parm_offset
);
657 * send fragment using for a sequence.
659 error
= lport
->tt
.seq_send(lport
, seq
, fp
);
661 WARN_ON(1); /* send error should be rare */
662 fc_fcp_retry_cmd(fsp
);
667 fsp
->xfer_len
+= seq_blen
; /* premature count? */
672 * fc_fcp_abts_resp() - Send an ABTS response
673 * @fsp: The FCP packet that is being aborted
674 * @fp: The response frame
676 static void fc_fcp_abts_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
679 struct fc_ba_rjt
*brp
;
680 struct fc_frame_header
*fh
;
682 fh
= fc_frame_header_get(fp
);
683 switch (fh
->fh_r_ctl
) {
687 brp
= fc_frame_payload_get(fp
, sizeof(*brp
));
688 if (brp
&& brp
->br_reason
== FC_BA_RJT_LOG_ERR
)
693 * we will let the command timeout
694 * and scsi-ml recover in this case,
695 * therefore cleared the ba_done flag.
701 fsp
->state
|= FC_SRB_ABORTED
;
702 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
704 if (fsp
->wait_for_comp
)
705 complete(&fsp
->tm_done
);
707 fc_fcp_complete_locked(fsp
);
712 * fc_fcp_recv() - Reveive an FCP frame
713 * @seq: The sequence the frame is on
714 * @fp: The received frame
715 * @arg: The related FCP packet
717 * Context: Called from Soft IRQ context. Can not be called
718 * holding the FCP packet list lock.
720 static void fc_fcp_recv(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
722 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
723 struct fc_lport
*lport
= fsp
->lp
;
724 struct fc_frame_header
*fh
;
725 struct fcp_txrdy
*dd
;
730 fc_fcp_error(fsp
, fp
);
734 fh
= fc_frame_header_get(fp
);
735 r_ctl
= fh
->fh_r_ctl
;
737 if (!(lport
->state
& LPORT_ST_READY
))
739 if (fc_fcp_lock_pkt(fsp
))
741 fsp
->last_pkt_time
= jiffies
;
743 if (fh
->fh_type
== FC_TYPE_BLS
) {
744 fc_fcp_abts_resp(fsp
, fp
);
748 if (fsp
->state
& (FC_SRB_ABORTED
| FC_SRB_ABORT_PENDING
))
751 if (r_ctl
== FC_RCTL_DD_DATA_DESC
) {
753 * received XFER RDY from the target
754 * need to send data to the target
756 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
757 dd
= fc_frame_payload_get(fp
, sizeof(*dd
));
760 rc
= fc_fcp_send_data(fsp
, seq
,
761 (size_t) ntohl(dd
->ft_data_ro
),
762 (size_t) ntohl(dd
->ft_burst_len
));
764 seq
->rec_data
= fsp
->xfer_len
;
765 } else if (r_ctl
== FC_RCTL_DD_SOL_DATA
) {
767 * received a DATA frame
768 * next we will copy the data to the system buffer
770 WARN_ON(fr_len(fp
) < sizeof(*fh
)); /* len may be 0 */
771 fc_fcp_recv_data(fsp
, fp
);
772 seq
->rec_data
= fsp
->xfer_contig_end
;
773 } else if (r_ctl
== FC_RCTL_DD_CMD_STATUS
) {
774 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
776 fc_fcp_resp(fsp
, fp
);
778 FC_FCP_DBG(fsp
, "unexpected frame. r_ctl %x\n", r_ctl
);
781 fc_fcp_unlock_pkt(fsp
);
787 * fc_fcp_resp() - Handler for FCP responses
788 * @fsp: The FCP packet the response is for
789 * @fp: The response frame
791 static void fc_fcp_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
793 struct fc_frame_header
*fh
;
794 struct fcp_resp
*fc_rp
;
795 struct fcp_resp_ext
*rp_ex
;
796 struct fcp_resp_rsp_info
*fc_rp_info
;
804 fh
= (struct fc_frame_header
*)fr_hdr(fp
);
805 if (unlikely(plen
< sizeof(*fh
) + sizeof(*fc_rp
)))
808 fc_rp
= (struct fcp_resp
*)(fh
+ 1);
809 fsp
->cdb_status
= fc_rp
->fr_status
;
810 flags
= fc_rp
->fr_flags
;
811 fsp
->scsi_comp_flags
= flags
;
812 expected_len
= fsp
->data_len
;
814 /* if ddp, update xfer len */
815 fc_fcp_ddp_done(fsp
);
817 if (unlikely((flags
& ~FCP_CONF_REQ
) || fc_rp
->fr_status
)) {
818 rp_ex
= (void *)(fc_rp
+ 1);
819 if (flags
& (FCP_RSP_LEN_VAL
| FCP_SNS_LEN_VAL
)) {
820 if (plen
< sizeof(*fc_rp
) + sizeof(*rp_ex
))
822 fc_rp_info
= (struct fcp_resp_rsp_info
*)(rp_ex
+ 1);
823 if (flags
& FCP_RSP_LEN_VAL
) {
824 respl
= ntohl(rp_ex
->fr_rsp_len
);
825 if (respl
!= sizeof(*fc_rp_info
))
827 if (fsp
->wait_for_comp
) {
828 /* Abuse cdb_status for rsp code */
829 fsp
->cdb_status
= fc_rp_info
->rsp_code
;
830 complete(&fsp
->tm_done
);
832 * tmfs will not have any scsi cmd so
839 if (flags
& FCP_SNS_LEN_VAL
) {
840 snsl
= ntohl(rp_ex
->fr_sns_len
);
841 if (snsl
> SCSI_SENSE_BUFFERSIZE
)
842 snsl
= SCSI_SENSE_BUFFERSIZE
;
843 memcpy(fsp
->cmd
->sense_buffer
,
844 (char *)fc_rp_info
+ respl
, snsl
);
847 if (flags
& (FCP_RESID_UNDER
| FCP_RESID_OVER
)) {
848 if (plen
< sizeof(*fc_rp
) + sizeof(rp_ex
->fr_resid
))
850 if (flags
& FCP_RESID_UNDER
) {
851 fsp
->scsi_resid
= ntohl(rp_ex
->fr_resid
);
853 * The cmnd->underflow is the minimum number of
854 * bytes that must be transfered for this
855 * command. Provided a sense condition is not
856 * present, make sure the actual amount
857 * transferred is at least the underflow value
860 if (!(flags
& FCP_SNS_LEN_VAL
) &&
861 (fc_rp
->fr_status
== 0) &&
862 (scsi_bufflen(fsp
->cmd
) -
863 fsp
->scsi_resid
) < fsp
->cmd
->underflow
)
865 expected_len
-= fsp
->scsi_resid
;
867 fsp
->status_code
= FC_ERROR
;
871 fsp
->state
|= FC_SRB_RCV_STATUS
;
874 * Check for missing or extra data frames.
876 if (unlikely(fsp
->xfer_len
!= expected_len
)) {
877 if (fsp
->xfer_len
< expected_len
) {
879 * Some data may be queued locally,
880 * Wait a at least one jiffy to see if it is delivered.
881 * If this expires without data, we may do SRR.
883 fc_fcp_timer_set(fsp
, 2);
886 fsp
->status_code
= FC_DATA_OVRRUN
;
887 FC_FCP_DBG(fsp
, "tgt %6x xfer len %zx greater than expected, "
888 "len %x, data len %x\n",
890 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
892 fc_fcp_complete_locked(fsp
);
896 FC_FCP_DBG(fsp
, "short FCP response. flags 0x%x len %u respl %u "
897 "snsl %u\n", flags
, fr_len(fp
), respl
, snsl
);
899 fsp
->status_code
= FC_ERROR
;
900 fc_fcp_complete_locked(fsp
);
904 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
906 * @fsp: The FCP packet to be completed
908 * This function may sleep if a timer is pending. The packet lock must be
909 * held, and the host lock must not be held.
911 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*fsp
)
913 struct fc_lport
*lport
= fsp
->lp
;
918 if (fsp
->state
& FC_SRB_ABORT_PENDING
)
921 if (fsp
->state
& FC_SRB_ABORTED
) {
922 if (!fsp
->status_code
)
923 fsp
->status_code
= FC_CMD_ABORTED
;
926 * Test for transport underrun, independent of response
929 if (fsp
->xfer_len
< fsp
->data_len
&& !fsp
->io_status
&&
930 (!(fsp
->scsi_comp_flags
& FCP_RESID_UNDER
) ||
931 fsp
->xfer_len
< fsp
->data_len
- fsp
->scsi_resid
)) {
932 fsp
->status_code
= FC_DATA_UNDRUN
;
940 if (unlikely(fsp
->scsi_comp_flags
& FCP_CONF_REQ
)) {
941 struct fc_frame
*conf_frame
;
944 csp
= lport
->tt
.seq_start_next(seq
);
945 conf_frame
= fc_fcp_frame_alloc(fsp
->lp
, 0);
947 f_ctl
= FC_FC_SEQ_INIT
;
948 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
949 ep
= fc_seq_exch(seq
);
950 fc_fill_fc_hdr(conf_frame
, FC_RCTL_DD_SOL_CTL
,
952 FC_TYPE_FCP
, f_ctl
, 0);
953 lport
->tt
.seq_send(lport
, csp
, conf_frame
);
956 lport
->tt
.exch_done(seq
);
962 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
963 * @fsp: The FCP packet whose exchanges should be canceled
964 * @error: The reason for the cancellation
966 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt
*fsp
, int error
)
968 struct fc_lport
*lport
= fsp
->lp
;
971 lport
->tt
.exch_done(fsp
->seq_ptr
);
974 fsp
->status_code
= error
;
978 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
979 * @lport: The local port whose exchanges should be canceled
980 * @id: The target's ID
982 * @error: The reason for cancellation
984 * If lun or id is -1, they are ignored.
986 static void fc_fcp_cleanup_each_cmd(struct fc_lport
*lport
, unsigned int id
,
987 unsigned int lun
, int error
)
989 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
990 struct fc_fcp_pkt
*fsp
;
991 struct scsi_cmnd
*sc_cmd
;
994 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
996 list_for_each_entry(fsp
, &si
->scsi_pkt_queue
, list
) {
998 if (id
!= -1 && scmd_id(sc_cmd
) != id
)
1001 if (lun
!= -1 && sc_cmd
->device
->lun
!= lun
)
1004 fc_fcp_pkt_hold(fsp
);
1005 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1007 if (!fc_fcp_lock_pkt(fsp
)) {
1008 fc_fcp_cleanup_cmd(fsp
, error
);
1010 fc_fcp_unlock_pkt(fsp
);
1013 fc_fcp_pkt_release(fsp
);
1014 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1016 * while we dropped the lock multiple pkts could
1017 * have been released, so we have to start over.
1021 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1025 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1026 * @lport: The local port whose exchanges are to be aborted
1028 static void fc_fcp_abort_io(struct fc_lport
*lport
)
1030 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_HRD_ERROR
);
1034 * fc_fcp_pkt_send() - Send a fcp_pkt
1035 * @lport: The local port to send the FCP packet on
1036 * @fsp: The FCP packet to send
1038 * Return: Zero for success and -1 for failure
1039 * Locks: Called without locks held
1041 static int fc_fcp_pkt_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
)
1043 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1044 unsigned long flags
;
1047 fsp
->cmd
->SCp
.ptr
= (char *)fsp
;
1048 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1049 fsp
->cdb_cmd
.fc_flags
= fsp
->req_flags
& ~FCP_CFL_LEN_MASK
;
1051 int_to_scsilun(fsp
->cmd
->device
->lun
,
1052 (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1053 memcpy(fsp
->cdb_cmd
.fc_cdb
, fsp
->cmd
->cmnd
, fsp
->cmd
->cmd_len
);
1055 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1056 list_add_tail(&fsp
->list
, &si
->scsi_pkt_queue
);
1057 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1058 rc
= lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_fcp_recv
);
1060 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1061 list_del(&fsp
->list
);
1062 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1069 * fc_fcp_cmd_send() - Send a FCP command
1070 * @lport: The local port to send the command on
1071 * @fsp: The FCP packet the command is on
1072 * @resp: The handler for the response
1074 static int fc_fcp_cmd_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1075 void (*resp
)(struct fc_seq
*,
1076 struct fc_frame
*fp
,
1079 struct fc_frame
*fp
;
1081 struct fc_rport
*rport
;
1082 struct fc_rport_libfc_priv
*rpriv
;
1083 const size_t len
= sizeof(fsp
->cdb_cmd
);
1086 if (fc_fcp_lock_pkt(fsp
))
1089 fp
= fc_fcp_frame_alloc(lport
, sizeof(fsp
->cdb_cmd
));
1095 memcpy(fc_frame_payload_get(fp
, len
), &fsp
->cdb_cmd
, len
);
1098 fsp
->max_payload
= rport
->maxframe_size
;
1099 rpriv
= rport
->dd_data
;
1101 fc_fill_fc_hdr(fp
, FC_RCTL_DD_UNSOL_CMD
, rport
->port_id
,
1102 fc_host_port_id(rpriv
->local_port
->host
), FC_TYPE_FCP
,
1103 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1105 seq
= lport
->tt
.exch_seq_send(lport
, fp
, resp
, fc_fcp_pkt_destroy
,
1111 fsp
->last_pkt_time
= jiffies
;
1113 fc_fcp_pkt_hold(fsp
); /* hold for fc_fcp_pkt_destroy */
1115 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1116 fc_fcp_timer_set(fsp
,
1117 (fsp
->tgt_flags
& FC_RP_FLAGS_REC_SUPPORTED
) ?
1118 FC_SCSI_REC_TOV
: FC_SCSI_ER_TIMEOUT
);
1120 fc_fcp_unlock_pkt(fsp
);
1125 * fc_fcp_error() - Handler for FCP layer errors
1126 * @fsp: The FCP packet the error is on
1127 * @fp: The frame that has errored
1129 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1131 int error
= PTR_ERR(fp
);
1133 if (fc_fcp_lock_pkt(fsp
))
1136 if (error
== -FC_EX_CLOSED
) {
1137 fc_fcp_retry_cmd(fsp
);
1142 * clear abort pending, because the lower layer
1143 * decided to force completion.
1145 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
1146 fsp
->status_code
= FC_CMD_PLOGO
;
1147 fc_fcp_complete_locked(fsp
);
1149 fc_fcp_unlock_pkt(fsp
);
1153 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1154 * @fsp: The FCP packet to abort on
1156 * Called to send an abort and then wait for abort completion
1158 static int fc_fcp_pkt_abort(struct fc_fcp_pkt
*fsp
)
1162 if (fc_fcp_send_abort(fsp
))
1165 init_completion(&fsp
->tm_done
);
1166 fsp
->wait_for_comp
= 1;
1168 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1169 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1170 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1171 fsp
->wait_for_comp
= 0;
1174 FC_FCP_DBG(fsp
, "target abort cmd failed\n");
1176 } else if (fsp
->state
& FC_SRB_ABORTED
) {
1177 FC_FCP_DBG(fsp
, "target abort cmd passed\n");
1179 fc_fcp_complete_locked(fsp
);
1186 * fc_lun_reset_send() - Send LUN reset command
1187 * @data: The FCP packet that identifies the LUN to be reset
1189 static void fc_lun_reset_send(unsigned long data
)
1191 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1192 struct fc_lport
*lport
= fsp
->lp
;
1193 if (lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_tm_done
)) {
1194 if (fsp
->recov_retry
++ >= FC_MAX_RECOV_RETRY
)
1196 if (fc_fcp_lock_pkt(fsp
))
1198 setup_timer(&fsp
->timer
, fc_lun_reset_send
, (unsigned long)fsp
);
1199 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1200 fc_fcp_unlock_pkt(fsp
);
1205 * fc_lun_reset() - Send a LUN RESET command to a device
1206 * and wait for the reply
1207 * @lport: The local port to sent the comand on
1208 * @fsp: The FCP packet that identifies the LUN to be reset
1209 * @id: The SCSI command ID
1210 * @lun: The LUN ID to be reset
1212 static int fc_lun_reset(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1213 unsigned int id
, unsigned int lun
)
1217 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1218 fsp
->cdb_cmd
.fc_tm_flags
= FCP_TMF_LUN_RESET
;
1219 int_to_scsilun(lun
, (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1221 fsp
->wait_for_comp
= 1;
1222 init_completion(&fsp
->tm_done
);
1224 fc_lun_reset_send((unsigned long)fsp
);
1227 * wait for completion of reset
1228 * after that make sure all commands are terminated
1230 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1232 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1233 fsp
->state
|= FC_SRB_COMPL
;
1234 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1236 del_timer_sync(&fsp
->timer
);
1238 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1240 lport
->tt
.exch_done(fsp
->seq_ptr
);
1241 fsp
->seq_ptr
= NULL
;
1243 fsp
->wait_for_comp
= 0;
1244 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1247 FC_SCSI_DBG(lport
, "lun reset failed\n");
1251 /* cdb_status holds the tmf's rsp code */
1252 if (fsp
->cdb_status
!= FCP_TMF_CMPL
)
1255 FC_SCSI_DBG(lport
, "lun reset to lun %u completed\n", lun
);
1256 fc_fcp_cleanup_each_cmd(lport
, id
, lun
, FC_CMD_ABORTED
);
1261 * fc_tm_done() - Task Managment response handler
1262 * @seq: The sequence that the response is on
1263 * @fp: The response frame
1264 * @arg: The FCP packet the response is for
1266 static void fc_tm_done(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1268 struct fc_fcp_pkt
*fsp
= arg
;
1269 struct fc_frame_header
*fh
;
1273 * If there is an error just let it timeout or wait
1274 * for TMF to be aborted if it timedout.
1276 * scsi-eh will escalate for when either happens.
1281 if (fc_fcp_lock_pkt(fsp
))
1285 * raced with eh timeout handler.
1287 if (!fsp
->seq_ptr
|| !fsp
->wait_for_comp
) {
1288 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1292 fh
= fc_frame_header_get(fp
);
1293 if (fh
->fh_type
!= FC_TYPE_BLS
)
1294 fc_fcp_resp(fsp
, fp
);
1295 fsp
->seq_ptr
= NULL
;
1296 fsp
->lp
->tt
.exch_done(seq
);
1298 fc_fcp_unlock_pkt(fsp
);
1302 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1303 * @lport: The local port to be cleaned up
1305 static void fc_fcp_cleanup(struct fc_lport
*lport
)
1307 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_ERROR
);
1311 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1312 * @data: The FCP packet that has timed out
1314 * If REC is supported then just issue it and return. The REC exchange will
1315 * complete or time out and recovery can continue at that point. Otherwise,
1316 * if the response has been received without all the data it has been
1317 * ER_TIMEOUT since the response was received. If the response has not been
1318 * received we see if data was received recently. If it has been then we
1319 * continue waiting, otherwise, we abort the command.
1321 static void fc_fcp_timeout(unsigned long data
)
1323 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1324 struct fc_rport
*rport
= fsp
->rport
;
1325 struct fc_rport_libfc_priv
*rpriv
= rport
->dd_data
;
1327 if (fc_fcp_lock_pkt(fsp
))
1330 if (fsp
->cdb_cmd
.fc_tm_flags
)
1333 fsp
->state
|= FC_SRB_FCP_PROCESSING_TMO
;
1335 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1337 else if (time_after_eq(fsp
->last_pkt_time
+ (FC_SCSI_ER_TIMEOUT
/ 2),
1339 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1340 else if (fsp
->state
& FC_SRB_RCV_STATUS
)
1341 fc_fcp_complete_locked(fsp
);
1343 fc_timeout_error(fsp
);
1344 fsp
->state
&= ~FC_SRB_FCP_PROCESSING_TMO
;
1346 fc_fcp_unlock_pkt(fsp
);
1350 * fc_fcp_rec() - Send a REC ELS request
1351 * @fsp: The FCP packet to send the REC request on
1353 static void fc_fcp_rec(struct fc_fcp_pkt
*fsp
)
1355 struct fc_lport
*lport
;
1356 struct fc_frame
*fp
;
1357 struct fc_rport
*rport
;
1358 struct fc_rport_libfc_priv
*rpriv
;
1362 rpriv
= rport
->dd_data
;
1363 if (!fsp
->seq_ptr
|| rpriv
->rp_state
!= RPORT_ST_READY
) {
1364 fsp
->status_code
= FC_HRD_ERROR
;
1366 fc_fcp_complete_locked(fsp
);
1369 fp
= fc_fcp_frame_alloc(lport
, sizeof(struct fc_els_rec
));
1373 fr_seq(fp
) = fsp
->seq_ptr
;
1374 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, rport
->port_id
,
1375 fc_host_port_id(rpriv
->local_port
->host
), FC_TYPE_ELS
,
1376 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1377 if (lport
->tt
.elsct_send(lport
, rport
->port_id
, fp
, ELS_REC
,
1378 fc_fcp_rec_resp
, fsp
,
1379 jiffies_to_msecs(FC_SCSI_REC_TOV
))) {
1380 fc_fcp_pkt_hold(fsp
); /* hold while REC outstanding */
1384 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1385 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1387 fc_timeout_error(fsp
);
1391 * fc_fcp_rec_resp() - Handler for REC ELS responses
1392 * @seq: The sequence the response is on
1393 * @fp: The response frame
1394 * @arg: The FCP packet the response is on
1396 * If the response is a reject then the scsi layer will handle
1397 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1398 * set the timeout and return. If the I/O was completed then complete the
1399 * exchange and tell the SCSI layer.
1401 static void fc_fcp_rec_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1403 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
1404 struct fc_els_rec_acc
*recp
;
1405 struct fc_els_ls_rjt
*rjt
;
1409 enum dma_data_direction data_dir
;
1411 struct fc_rport_libfc_priv
*rpriv
;
1414 fc_fcp_rec_error(fsp
, fp
);
1418 if (fc_fcp_lock_pkt(fsp
))
1421 fsp
->recov_retry
= 0;
1422 opcode
= fc_frame_payload_op(fp
);
1423 if (opcode
== ELS_LS_RJT
) {
1424 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1425 switch (rjt
->er_reason
) {
1427 FC_FCP_DBG(fsp
, "device %x unexpected REC reject "
1428 "reason %d expl %d\n",
1429 fsp
->rport
->port_id
, rjt
->er_reason
,
1433 FC_FCP_DBG(fsp
, "device does not support REC\n");
1434 rpriv
= fsp
->rport
->dd_data
;
1436 * if we do not spport RECs or got some bogus
1437 * reason then resetup timer so we check for
1440 rpriv
->flags
&= ~FC_RP_FLAGS_REC_SUPPORTED
;
1441 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1446 * If no data transfer, the command frame got dropped
1447 * so we just retry. If data was transferred, we
1448 * lost the response but the target has no record,
1449 * so we abort and retry.
1451 if (rjt
->er_explan
== ELS_EXPL_OXID_RXID
&&
1452 fsp
->xfer_len
== 0) {
1453 fc_fcp_retry_cmd(fsp
);
1456 fc_timeout_error(fsp
);
1459 } else if (opcode
== ELS_LS_ACC
) {
1460 if (fsp
->state
& FC_SRB_ABORTED
)
1463 data_dir
= fsp
->cmd
->sc_data_direction
;
1464 recp
= fc_frame_payload_get(fp
, sizeof(*recp
));
1465 offset
= ntohl(recp
->reca_fc4value
);
1466 e_stat
= ntohl(recp
->reca_e_stat
);
1468 if (e_stat
& ESB_ST_COMPLETE
) {
1471 * The exchange is complete.
1473 * For output, we must've lost the response.
1474 * For input, all data must've been sent.
1475 * We lost may have lost the response
1476 * (and a confirmation was requested) and maybe
1479 * If all data received, send SRR
1480 * asking for response. If partial data received,
1481 * or gaps, SRR requests data at start of gap.
1482 * Recovery via SRR relies on in-order-delivery.
1484 if (data_dir
== DMA_TO_DEVICE
) {
1485 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1486 } else if (fsp
->xfer_contig_end
== offset
) {
1487 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1489 offset
= fsp
->xfer_contig_end
;
1490 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1492 fc_fcp_srr(fsp
, r_ctl
, offset
);
1493 } else if (e_stat
& ESB_ST_SEQ_INIT
) {
1496 * The remote port has the initiative, so just
1497 * keep waiting for it to complete.
1499 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1503 * The exchange is incomplete, we have seq. initiative.
1504 * Lost response with requested confirmation,
1505 * lost confirmation, lost transfer ready or
1508 * For output, if not all data was received, ask
1509 * for transfer ready to be repeated.
1511 * If we received or sent all the data, send SRR to
1514 * If we lost a response, we may have lost some read
1517 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1518 if (data_dir
== DMA_TO_DEVICE
) {
1519 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1520 if (offset
< fsp
->data_len
)
1521 r_ctl
= FC_RCTL_DD_DATA_DESC
;
1522 } else if (offset
== fsp
->xfer_contig_end
) {
1523 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1524 } else if (fsp
->xfer_contig_end
< offset
) {
1525 offset
= fsp
->xfer_contig_end
;
1527 fc_fcp_srr(fsp
, r_ctl
, offset
);
1531 fc_fcp_unlock_pkt(fsp
);
1533 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1538 * fc_fcp_rec_error() - Handler for REC errors
1539 * @fsp: The FCP packet the error is on
1540 * @fp: The REC frame
1542 static void fc_fcp_rec_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1544 int error
= PTR_ERR(fp
);
1546 if (fc_fcp_lock_pkt(fsp
))
1551 fc_fcp_retry_cmd(fsp
);
1555 FC_FCP_DBG(fsp
, "REC %p fid %x error unexpected error %d\n",
1556 fsp
, fsp
->rport
->port_id
, error
);
1557 fsp
->status_code
= FC_CMD_PLOGO
;
1560 case -FC_EX_TIMEOUT
:
1562 * Assume REC or LS_ACC was lost.
1563 * The exchange manager will have aborted REC, so retry.
1565 FC_FCP_DBG(fsp
, "REC fid %x error error %d retry %d/%d\n",
1566 fsp
->rport
->port_id
, error
, fsp
->recov_retry
,
1567 FC_MAX_RECOV_RETRY
);
1568 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1571 fc_timeout_error(fsp
);
1574 fc_fcp_unlock_pkt(fsp
);
1576 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1580 * fc_timeout_error() - Handler for fcp_pkt timeouts
1581 * @fsp: The FCP packt that has timed out
1583 static void fc_timeout_error(struct fc_fcp_pkt
*fsp
)
1585 fsp
->status_code
= FC_CMD_TIME_OUT
;
1586 fsp
->cdb_status
= 0;
1589 * if this fails then we let the scsi command timer fire and
1592 fc_fcp_send_abort(fsp
);
1596 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1597 * @fsp: The FCP packet the SRR is to be sent on
1598 * @r_ctl: The R_CTL field for the SRR request
1599 * This is called after receiving status but insufficient data, or
1600 * when expecting status but the request has timed out.
1602 static void fc_fcp_srr(struct fc_fcp_pkt
*fsp
, enum fc_rctl r_ctl
, u32 offset
)
1604 struct fc_lport
*lport
= fsp
->lp
;
1605 struct fc_rport
*rport
;
1606 struct fc_rport_libfc_priv
*rpriv
;
1607 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1609 struct fcp_srr
*srr
;
1610 struct fc_frame
*fp
;
1614 rpriv
= rport
->dd_data
;
1615 cdb_op
= fsp
->cdb_cmd
.fc_cdb
[0];
1617 if (!(rpriv
->flags
& FC_RP_FLAGS_RETRY
) ||
1618 rpriv
->rp_state
!= RPORT_ST_READY
)
1619 goto retry
; /* shouldn't happen */
1620 fp
= fc_fcp_frame_alloc(lport
, sizeof(*srr
));
1624 srr
= fc_frame_payload_get(fp
, sizeof(*srr
));
1625 memset(srr
, 0, sizeof(*srr
));
1626 srr
->srr_op
= ELS_SRR
;
1627 srr
->srr_ox_id
= htons(ep
->oxid
);
1628 srr
->srr_rx_id
= htons(ep
->rxid
);
1629 srr
->srr_r_ctl
= r_ctl
;
1630 srr
->srr_rel_off
= htonl(offset
);
1632 fc_fill_fc_hdr(fp
, FC_RCTL_ELS4_REQ
, rport
->port_id
,
1633 fc_host_port_id(rpriv
->local_port
->host
), FC_TYPE_FCP
,
1634 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1636 seq
= lport
->tt
.exch_seq_send(lport
, fp
, fc_fcp_srr_resp
, NULL
,
1637 fsp
, jiffies_to_msecs(FC_SCSI_REC_TOV
));
1641 fsp
->recov_seq
= seq
;
1642 fsp
->xfer_len
= offset
;
1643 fsp
->xfer_contig_end
= offset
;
1644 fsp
->state
&= ~FC_SRB_RCV_STATUS
;
1645 fc_fcp_pkt_hold(fsp
); /* hold for outstanding SRR */
1648 fc_fcp_retry_cmd(fsp
);
1652 * fc_fcp_srr_resp() - Handler for SRR response
1653 * @seq: The sequence the SRR is on
1654 * @fp: The SRR frame
1655 * @arg: The FCP packet the SRR is on
1657 static void fc_fcp_srr_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1659 struct fc_fcp_pkt
*fsp
= arg
;
1660 struct fc_frame_header
*fh
;
1663 fc_fcp_srr_error(fsp
, fp
);
1667 if (fc_fcp_lock_pkt(fsp
))
1670 fh
= fc_frame_header_get(fp
);
1672 * BUG? fc_fcp_srr_error calls exch_done which would release
1673 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1674 * then fc_exch_timeout would be sending an abort. The exch_done
1675 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1676 * an abort response though.
1678 if (fh
->fh_type
== FC_TYPE_BLS
) {
1679 fc_fcp_unlock_pkt(fsp
);
1683 fsp
->recov_seq
= NULL
;
1684 switch (fc_frame_payload_op(fp
)) {
1686 fsp
->recov_retry
= 0;
1687 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1691 fc_timeout_error(fsp
);
1694 fc_fcp_unlock_pkt(fsp
);
1695 fsp
->lp
->tt
.exch_done(seq
);
1698 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1702 * fc_fcp_srr_error() - Handler for SRR errors
1703 * @fsp: The FCP packet that the SRR error is on
1704 * @fp: The SRR frame
1706 static void fc_fcp_srr_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1708 if (fc_fcp_lock_pkt(fsp
))
1710 fsp
->lp
->tt
.exch_done(fsp
->recov_seq
);
1711 fsp
->recov_seq
= NULL
;
1712 switch (PTR_ERR(fp
)) {
1713 case -FC_EX_TIMEOUT
:
1714 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1717 fc_timeout_error(fsp
);
1719 case -FC_EX_CLOSED
: /* e.g., link failure */
1722 fc_fcp_retry_cmd(fsp
);
1725 fc_fcp_unlock_pkt(fsp
);
1727 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1731 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1732 * @lport: The local port to be checked
1734 static inline int fc_fcp_lport_queue_ready(struct fc_lport
*lport
)
1737 return (lport
->state
== LPORT_ST_READY
) &&
1738 lport
->link_up
&& !lport
->qfull
;
1742 * fc_queuecommand() - The queuecommand function of the SCSI template
1743 * @cmd: The scsi_cmnd to be executed
1744 * @done: The callback function to be called when the scsi_cmnd is complete
1746 * This is the i/o strategy routine, called by the SCSI layer. This routine
1747 * is called with the host_lock held.
1749 int fc_queuecommand(struct scsi_cmnd
*sc_cmd
, void (*done
)(struct scsi_cmnd
*))
1751 struct fc_lport
*lport
;
1752 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1753 struct fc_fcp_pkt
*fsp
;
1754 struct fc_rport_libfc_priv
*rpriv
;
1757 struct fcoe_dev_stats
*stats
;
1759 lport
= shost_priv(sc_cmd
->device
->host
);
1760 spin_unlock_irq(lport
->host
->host_lock
);
1762 rval
= fc_remote_port_chkready(rport
);
1764 sc_cmd
->result
= rval
;
1769 if (!*(struct fc_remote_port
**)rport
->dd_data
) {
1771 * rport is transitioning from blocked/deleted to
1774 sc_cmd
->result
= DID_IMM_RETRY
<< 16;
1779 rpriv
= rport
->dd_data
;
1781 if (!fc_fcp_lport_queue_ready(lport
)) {
1783 fc_fcp_can_queue_ramp_down(lport
);
1784 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1788 fsp
= fc_fcp_pkt_alloc(lport
, GFP_ATOMIC
);
1790 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1795 * build the libfc request pkt
1797 fsp
->cmd
= sc_cmd
; /* save the cmd */
1798 fsp
->lp
= lport
; /* save the softc ptr */
1799 fsp
->rport
= rport
; /* set the remote port ptr */
1800 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
1801 sc_cmd
->scsi_done
= done
;
1804 * set up the transfer length
1806 fsp
->data_len
= scsi_bufflen(sc_cmd
);
1810 * setup the data direction
1812 stats
= fc_lport_get_stats(lport
);
1813 if (sc_cmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
1814 fsp
->req_flags
= FC_SRB_READ
;
1815 stats
->InputRequests
++;
1816 stats
->InputMegabytes
= fsp
->data_len
;
1817 } else if (sc_cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1818 fsp
->req_flags
= FC_SRB_WRITE
;
1819 stats
->OutputRequests
++;
1820 stats
->OutputMegabytes
= fsp
->data_len
;
1823 stats
->ControlRequests
++;
1826 fsp
->tgt_flags
= rpriv
->flags
;
1828 init_timer(&fsp
->timer
);
1829 fsp
->timer
.data
= (unsigned long)fsp
;
1832 * send it to the lower layer
1833 * if we get -1 return then put the request in the pending
1836 rval
= fc_fcp_pkt_send(lport
, fsp
);
1838 fsp
->state
= FC_SRB_FREE
;
1839 fc_fcp_pkt_release(fsp
);
1840 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1843 spin_lock_irq(lport
->host
->host_lock
);
1846 EXPORT_SYMBOL(fc_queuecommand
);
1849 * fc_io_compl() - Handle responses for completed commands
1850 * @fsp: The FCP packet that is complete
1852 * Translates fcp_pkt errors to a Linux SCSI errors.
1853 * The fcp packet lock must be held when calling.
1855 static void fc_io_compl(struct fc_fcp_pkt
*fsp
)
1857 struct fc_fcp_internal
*si
;
1858 struct scsi_cmnd
*sc_cmd
;
1859 struct fc_lport
*lport
;
1860 unsigned long flags
;
1862 /* release outstanding ddp context */
1863 fc_fcp_ddp_done(fsp
);
1865 fsp
->state
|= FC_SRB_COMPL
;
1866 if (!(fsp
->state
& FC_SRB_FCP_PROCESSING_TMO
)) {
1867 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1868 del_timer_sync(&fsp
->timer
);
1869 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1873 si
= fc_get_scsi_internal(lport
);
1878 * if can_queue ramp down is done then try can_queue ramp up
1879 * since commands are completing now.
1881 if (si
->last_can_queue_ramp_down_time
)
1882 fc_fcp_can_queue_ramp_up(lport
);
1887 if (!sc_cmd
->SCp
.ptr
)
1890 CMD_SCSI_STATUS(sc_cmd
) = fsp
->cdb_status
;
1891 switch (fsp
->status_code
) {
1893 if (fsp
->cdb_status
== 0) {
1897 sc_cmd
->result
= DID_OK
<< 16;
1898 if (fsp
->scsi_resid
)
1899 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1902 * transport level I/O was ok but scsi
1903 * has non zero status
1905 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
1909 sc_cmd
->result
= DID_ERROR
<< 16;
1911 case FC_DATA_UNDRUN
:
1912 if ((fsp
->cdb_status
== 0) && !(fsp
->req_flags
& FC_SRB_READ
)) {
1914 * scsi status is good but transport level
1917 sc_cmd
->result
= (fsp
->state
& FC_SRB_RCV_STATUS
?
1918 DID_OK
: DID_ERROR
) << 16;
1921 * scsi got underrun, this is an error
1923 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1924 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1927 case FC_DATA_OVRRUN
:
1929 * overrun is an error
1931 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1933 case FC_CMD_ABORTED
:
1934 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->io_status
;
1936 case FC_CMD_TIME_OUT
:
1937 sc_cmd
->result
= (DID_BUS_BUSY
<< 16) | fsp
->io_status
;
1940 sc_cmd
->result
= (DID_RESET
<< 16);
1943 sc_cmd
->result
= (DID_NO_CONNECT
<< 16);
1946 sc_cmd
->result
= (DID_ERROR
<< 16);
1950 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1951 list_del(&fsp
->list
);
1952 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1953 sc_cmd
->SCp
.ptr
= NULL
;
1954 sc_cmd
->scsi_done(sc_cmd
);
1956 /* release ref from initial allocation in queue command */
1957 fc_fcp_pkt_release(fsp
);
1961 * fc_eh_abort() - Abort a command
1962 * @sc_cmd: The SCSI command to abort
1964 * From SCSI host template.
1965 * Send an ABTS to the target device and wait for the response.
1967 int fc_eh_abort(struct scsi_cmnd
*sc_cmd
)
1969 struct fc_fcp_pkt
*fsp
;
1970 struct fc_lport
*lport
;
1972 unsigned long flags
;
1974 lport
= shost_priv(sc_cmd
->device
->host
);
1975 if (lport
->state
!= LPORT_ST_READY
)
1977 else if (!lport
->link_up
)
1980 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
1981 fsp
= CMD_SP(sc_cmd
);
1983 /* command completed while scsi eh was setting up */
1984 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1987 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1988 fc_fcp_pkt_hold(fsp
);
1989 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1991 if (fc_fcp_lock_pkt(fsp
)) {
1992 /* completed while we were waiting for timer to be deleted */
1997 rc
= fc_fcp_pkt_abort(fsp
);
1998 fc_fcp_unlock_pkt(fsp
);
2001 fc_fcp_pkt_release(fsp
);
2004 EXPORT_SYMBOL(fc_eh_abort
);
2007 * fc_eh_device_reset() - Reset a single LUN
2008 * @sc_cmd: The SCSI command which identifies the device whose
2009 * LUN is to be reset
2011 * Set from SCSI host template.
2013 int fc_eh_device_reset(struct scsi_cmnd
*sc_cmd
)
2015 struct fc_lport
*lport
;
2016 struct fc_fcp_pkt
*fsp
;
2017 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
2021 rval
= fc_remote_port_chkready(rport
);
2025 lport
= shost_priv(sc_cmd
->device
->host
);
2027 if (lport
->state
!= LPORT_ST_READY
)
2030 FC_SCSI_DBG(lport
, "Resetting rport (%6x)\n", rport
->port_id
);
2032 fsp
= fc_fcp_pkt_alloc(lport
, GFP_NOIO
);
2034 printk(KERN_WARNING
"libfc: could not allocate scsi_pkt\n");
2039 * Build the libfc request pkt. Do not set the scsi cmnd, because
2040 * the sc passed in is not setup for execution like when sent
2041 * through the queuecommand callout.
2043 fsp
->lp
= lport
; /* save the softc ptr */
2044 fsp
->rport
= rport
; /* set the remote port ptr */
2047 * flush outstanding commands
2049 rc
= fc_lun_reset(lport
, fsp
, scmd_id(sc_cmd
), sc_cmd
->device
->lun
);
2050 fsp
->state
= FC_SRB_FREE
;
2051 fc_fcp_pkt_release(fsp
);
2056 EXPORT_SYMBOL(fc_eh_device_reset
);
2059 * fc_eh_host_reset() - Reset a Scsi_Host.
2060 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2062 int fc_eh_host_reset(struct scsi_cmnd
*sc_cmd
)
2064 struct Scsi_Host
*shost
= sc_cmd
->device
->host
;
2065 struct fc_lport
*lport
= shost_priv(shost
);
2066 unsigned long wait_tmo
;
2068 FC_SCSI_DBG(lport
, "Resetting host\n");
2070 lport
->tt
.lport_reset(lport
);
2071 wait_tmo
= jiffies
+ FC_HOST_RESET_TIMEOUT
;
2072 while (!fc_fcp_lport_queue_ready(lport
) && time_before(jiffies
,
2076 if (fc_fcp_lport_queue_ready(lport
)) {
2077 shost_printk(KERN_INFO
, shost
, "libfc: Host reset succeeded "
2078 "on port (%6x)\n", fc_host_port_id(lport
->host
));
2081 shost_printk(KERN_INFO
, shost
, "libfc: Host reset failed, "
2082 "port (%6x) is not ready.\n",
2083 fc_host_port_id(lport
->host
));
2087 EXPORT_SYMBOL(fc_eh_host_reset
);
2090 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2091 * @sdev: The SCSI device that identifies the SCSI host
2093 * Configures queue depth based on host's cmd_per_len. If not set
2094 * then we use the libfc default.
2096 int fc_slave_alloc(struct scsi_device
*sdev
)
2098 struct fc_rport
*rport
= starget_to_rport(scsi_target(sdev
));
2100 if (!rport
|| fc_remote_port_chkready(rport
))
2103 if (sdev
->tagged_supported
)
2104 scsi_activate_tcq(sdev
, FC_FCP_DFLT_QUEUE_DEPTH
);
2106 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
),
2107 FC_FCP_DFLT_QUEUE_DEPTH
);
2111 EXPORT_SYMBOL(fc_slave_alloc
);
2114 * fc_change_queue_depth() - Change a device's queue depth
2115 * @sdev: The SCSI device whose queue depth is to change
2116 * @qdepth: The new queue depth
2117 * @reason: The resason for the change
2119 int fc_change_queue_depth(struct scsi_device
*sdev
, int qdepth
, int reason
)
2122 case SCSI_QDEPTH_DEFAULT
:
2123 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2125 case SCSI_QDEPTH_QFULL
:
2126 scsi_track_queue_full(sdev
, qdepth
);
2128 case SCSI_QDEPTH_RAMP_UP
:
2129 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2134 return sdev
->queue_depth
;
2136 EXPORT_SYMBOL(fc_change_queue_depth
);
2139 * fc_change_queue_type() - Change a device's queue type
2140 * @sdev: The SCSI device whose queue depth is to change
2141 * @tag_type: Identifier for queue type
2143 int fc_change_queue_type(struct scsi_device
*sdev
, int tag_type
)
2145 if (sdev
->tagged_supported
) {
2146 scsi_set_tag_type(sdev
, tag_type
);
2148 scsi_activate_tcq(sdev
, sdev
->queue_depth
);
2150 scsi_deactivate_tcq(sdev
, sdev
->queue_depth
);
2156 EXPORT_SYMBOL(fc_change_queue_type
);
2159 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2160 * @lport: The local port that no longer needs the FCP layer
2162 void fc_fcp_destroy(struct fc_lport
*lport
)
2164 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
2166 if (!list_empty(&si
->scsi_pkt_queue
))
2167 printk(KERN_ERR
"libfc: Leaked SCSI packets when destroying "
2168 "port (%6x)\n", fc_host_port_id(lport
->host
));
2170 mempool_destroy(si
->scsi_pkt_pool
);
2172 lport
->scsi_priv
= NULL
;
2174 EXPORT_SYMBOL(fc_fcp_destroy
);
2180 scsi_pkt_cachep
= kmem_cache_create("libfc_fcp_pkt",
2181 sizeof(struct fc_fcp_pkt
),
2182 0, SLAB_HWCACHE_ALIGN
, NULL
);
2183 if (!scsi_pkt_cachep
) {
2184 printk(KERN_ERR
"libfc: Unable to allocate SRB cache, "
2185 "module load failed!");
2192 void fc_destroy_fcp()
2194 if (scsi_pkt_cachep
)
2195 kmem_cache_destroy(scsi_pkt_cachep
);
2199 * fc_fcp_init() - Initialize the FCP layer for a local port
2200 * @lport: The local port to initialize the exchange layer for
2202 int fc_fcp_init(struct fc_lport
*lport
)
2205 struct fc_fcp_internal
*si
;
2207 if (!lport
->tt
.fcp_cmd_send
)
2208 lport
->tt
.fcp_cmd_send
= fc_fcp_cmd_send
;
2210 if (!lport
->tt
.fcp_cleanup
)
2211 lport
->tt
.fcp_cleanup
= fc_fcp_cleanup
;
2213 if (!lport
->tt
.fcp_abort_io
)
2214 lport
->tt
.fcp_abort_io
= fc_fcp_abort_io
;
2216 si
= kzalloc(sizeof(struct fc_fcp_internal
), GFP_KERNEL
);
2219 lport
->scsi_priv
= si
;
2220 si
->max_can_queue
= lport
->host
->can_queue
;
2221 INIT_LIST_HEAD(&si
->scsi_pkt_queue
);
2222 spin_lock_init(&si
->scsi_queue_lock
);
2224 si
->scsi_pkt_pool
= mempool_create_slab_pool(2, scsi_pkt_cachep
);
2225 if (!si
->scsi_pkt_pool
) {
2235 EXPORT_SYMBOL(fc_fcp_init
);