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 acknowleged */
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_pkt_queue: Current FCP packets
73 * @last_can_queue_ramp_down_time: ramp down time
74 * @last_can_queue_ramp_up_time: ramp up time
75 * @max_can_queue: max can_queue size
77 struct fc_fcp_internal
{
78 mempool_t
*scsi_pkt_pool
;
79 struct list_head scsi_pkt_queue
;
80 unsigned long last_can_queue_ramp_down_time
;
81 unsigned long last_can_queue_ramp_up_time
;
85 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
89 * FC scsi I/O related functions
91 static void fc_fcp_recv_data(struct fc_fcp_pkt
*, struct fc_frame
*);
92 static void fc_fcp_recv(struct fc_seq
*, struct fc_frame
*, void *);
93 static void fc_fcp_resp(struct fc_fcp_pkt
*, struct fc_frame
*);
94 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*);
95 static void fc_tm_done(struct fc_seq
*, struct fc_frame
*, void *);
96 static void fc_fcp_error(struct fc_fcp_pkt
*, struct fc_frame
*);
97 static void fc_timeout_error(struct fc_fcp_pkt
*);
98 static void fc_fcp_timeout(unsigned long);
99 static void fc_fcp_rec(struct fc_fcp_pkt
*);
100 static void fc_fcp_rec_error(struct fc_fcp_pkt
*, struct fc_frame
*);
101 static void fc_fcp_rec_resp(struct fc_seq
*, struct fc_frame
*, void *);
102 static void fc_io_compl(struct fc_fcp_pkt
*);
104 static void fc_fcp_srr(struct fc_fcp_pkt
*, enum fc_rctl
, u32
);
105 static void fc_fcp_srr_resp(struct fc_seq
*, struct fc_frame
*, void *);
106 static void fc_fcp_srr_error(struct fc_fcp_pkt
*, struct fc_frame
*);
109 * command status codes
111 #define FC_COMPLETE 0
112 #define FC_CMD_ABORTED 1
113 #define FC_CMD_RESET 2
114 #define FC_CMD_PLOGO 3
116 #define FC_TRANS_ERR 5
117 #define FC_DATA_OVRRUN 6
118 #define FC_DATA_UNDRUN 7
120 #define FC_HRD_ERROR 9
121 #define FC_CMD_TIME_OUT 10
124 * Error recovery timeout values.
126 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
127 #define FC_SCSI_TM_TOV (10 * HZ)
128 #define FC_SCSI_REC_TOV (2 * HZ)
129 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
130 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
132 #define FC_MAX_ERROR_CNT 5
133 #define FC_MAX_RECOV_RETRY 3
135 #define FC_FCP_DFLT_QUEUE_DEPTH 32
138 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
139 * @lport: The local port that the FCP packet is for
140 * @gfp: GFP flags for allocation
142 * Return value: fcp_pkt structure or null on allocation failure.
143 * Context: Can be called from process context, no lock is required.
145 static struct fc_fcp_pkt
*fc_fcp_pkt_alloc(struct fc_lport
*lport
, gfp_t gfp
)
147 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
148 struct fc_fcp_pkt
*fsp
;
150 fsp
= mempool_alloc(si
->scsi_pkt_pool
, gfp
);
152 memset(fsp
, 0, sizeof(*fsp
));
154 atomic_set(&fsp
->ref_cnt
, 1);
155 init_timer(&fsp
->timer
);
156 INIT_LIST_HEAD(&fsp
->list
);
157 spin_lock_init(&fsp
->scsi_pkt_lock
);
163 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
164 * @fsp: The FCP packet to be released
166 * Context: Can be called from process or interrupt context,
167 * no lock is required.
169 static void fc_fcp_pkt_release(struct fc_fcp_pkt
*fsp
)
171 if (atomic_dec_and_test(&fsp
->ref_cnt
)) {
172 struct fc_fcp_internal
*si
= fc_get_scsi_internal(fsp
->lp
);
174 mempool_free(fsp
, si
->scsi_pkt_pool
);
179 * fc_fcp_pkt_hold() - Hold a fcp_pkt
180 * @fsp: The FCP packet to be held
182 static void fc_fcp_pkt_hold(struct fc_fcp_pkt
*fsp
)
184 atomic_inc(&fsp
->ref_cnt
);
188 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
189 * @seq: The sequence that the FCP packet is on (required by destructor API)
190 * @fsp: The FCP packet to be released
192 * This routine is called by a destructor callback in the exch_seq_send()
193 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
194 * argument even though it is not used by this routine.
196 * Context: No locking required.
198 static void fc_fcp_pkt_destroy(struct fc_seq
*seq
, void *fsp
)
200 fc_fcp_pkt_release(fsp
);
204 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
205 * @fsp: The FCP packet to be locked and incremented
207 * We should only return error if we return a command to SCSI-ml before
208 * getting a response. This can happen in cases where we send a abort, but
209 * do not wait for the response and the abort and command can be passing
210 * each other on the wire/network-layer.
212 * Note: this function locks the packet and gets a reference to allow
213 * callers to call the completion function while the lock is held and
214 * not have to worry about the packets refcount.
216 * TODO: Maybe we should just have callers grab/release the lock and
217 * have a function that they call to verify the fsp and grab a ref if
220 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt
*fsp
)
222 spin_lock_bh(&fsp
->scsi_pkt_lock
);
223 if (fsp
->state
& FC_SRB_COMPL
) {
224 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
228 fc_fcp_pkt_hold(fsp
);
233 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
235 * @fsp: The FCP packet to be unlocked and decremented
237 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt
*fsp
)
239 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
240 fc_fcp_pkt_release(fsp
);
244 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
245 * @fsp: The FCP packet to start a timer for
246 * @delay: The timeout period for the timer
248 static void fc_fcp_timer_set(struct fc_fcp_pkt
*fsp
, unsigned long delay
)
250 if (!(fsp
->state
& FC_SRB_COMPL
))
251 mod_timer(&fsp
->timer
, jiffies
+ delay
);
255 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
257 * @fsp: The FCP packet to abort exchanges on
259 static int fc_fcp_send_abort(struct fc_fcp_pkt
*fsp
)
264 fsp
->state
|= FC_SRB_ABORT_PENDING
;
265 return fsp
->lp
->tt
.seq_exch_abort(fsp
->seq_ptr
, 0);
269 * fc_fcp_retry_cmd() - Retry a fcp_pkt
270 * @fsp: The FCP packet to be retried
272 * Sets the status code to be FC_ERROR and then calls
273 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
274 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
275 * The SCSI-ml will retry the command.
277 static void fc_fcp_retry_cmd(struct fc_fcp_pkt
*fsp
)
280 fsp
->lp
->tt
.exch_done(fsp
->seq_ptr
);
284 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
286 fsp
->status_code
= FC_ERROR
;
287 fc_fcp_complete_locked(fsp
);
291 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
292 * @fsp: The FCP packet that will manage the DDP frames
293 * @xid: The XID that will be used for the DDP exchange
295 void fc_fcp_ddp_setup(struct fc_fcp_pkt
*fsp
, u16 xid
)
297 struct fc_lport
*lport
;
303 if ((fsp
->req_flags
& FC_SRB_READ
) &&
304 (lport
->lro_enabled
) && (lport
->tt
.ddp_setup
)) {
305 if (lport
->tt
.ddp_setup(lport
, xid
, scsi_sglist(fsp
->cmd
),
306 scsi_sg_count(fsp
->cmd
)))
312 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
313 * DDP related resources for a fcp_pkt
314 * @fsp: The FCP packet that DDP had been used on
316 static void fc_fcp_ddp_done(struct fc_fcp_pkt
*fsp
)
318 struct fc_lport
*lport
;
323 if (fsp
->xfer_ddp
== FC_XID_UNKNOWN
)
327 if (lport
->tt
.ddp_done
) {
328 fsp
->xfer_len
= lport
->tt
.ddp_done(lport
, fsp
->xfer_ddp
);
329 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
334 * fc_fcp_can_queue_ramp_up() - increases can_queue
335 * @lport: lport to ramp up can_queue
337 * Locking notes: Called with Scsi_Host lock held
339 static void fc_fcp_can_queue_ramp_up(struct fc_lport
*lport
)
341 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
344 if (si
->last_can_queue_ramp_up_time
&&
345 (time_before(jiffies
, si
->last_can_queue_ramp_up_time
+
346 FC_CAN_QUEUE_PERIOD
)))
349 if (time_before(jiffies
, si
->last_can_queue_ramp_down_time
+
350 FC_CAN_QUEUE_PERIOD
))
353 si
->last_can_queue_ramp_up_time
= jiffies
;
355 can_queue
= lport
->host
->can_queue
<< 1;
356 if (can_queue
>= si
->max_can_queue
) {
357 can_queue
= si
->max_can_queue
;
358 si
->last_can_queue_ramp_down_time
= 0;
360 lport
->host
->can_queue
= can_queue
;
361 shost_printk(KERN_ERR
, lport
->host
, "libfc: increased "
362 "can_queue to %d.\n", can_queue
);
366 * fc_fcp_can_queue_ramp_down() - reduces can_queue
367 * @lport: lport to reduce can_queue
369 * If we are getting memory allocation failures, then we may
370 * be trying to execute too many commands. We let the running
371 * commands complete or timeout, then try again with a reduced
372 * can_queue. Eventually we will hit the point where we run
373 * on all reserved structs.
375 * Locking notes: Called with Scsi_Host lock held
377 static void fc_fcp_can_queue_ramp_down(struct fc_lport
*lport
)
379 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
382 if (si
->last_can_queue_ramp_down_time
&&
383 (time_before(jiffies
, si
->last_can_queue_ramp_down_time
+
384 FC_CAN_QUEUE_PERIOD
)))
387 si
->last_can_queue_ramp_down_time
= jiffies
;
389 can_queue
= lport
->host
->can_queue
;
393 lport
->host
->can_queue
= can_queue
;
394 shost_printk(KERN_ERR
, lport
->host
, "libfc: Could not allocate frame.\n"
395 "Reducing can_queue to %d.\n", can_queue
);
399 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
400 * @lport: fc lport struct
401 * @len: payload length
403 * Allocates fc_frame structure and buffer but if fails to allocate
404 * then reduce can_queue.
406 static inline struct fc_frame
*fc_fcp_frame_alloc(struct fc_lport
*lport
,
412 fp
= fc_frame_alloc(lport
, len
);
414 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
415 fc_fcp_can_queue_ramp_down(lport
);
416 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
422 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
423 * @fsp: The FCP packet the data is on
424 * @fp: The data frame
426 static void fc_fcp_recv_data(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
428 struct scsi_cmnd
*sc
= fsp
->cmd
;
429 struct fc_lport
*lport
= fsp
->lp
;
430 struct fcoe_dev_stats
*stats
;
431 struct fc_frame_header
*fh
;
438 struct scatterlist
*sg
;
441 fh
= fc_frame_header_get(fp
);
442 offset
= ntohl(fh
->fh_parm_offset
);
443 start_offset
= offset
;
444 len
= fr_len(fp
) - sizeof(*fh
);
445 buf
= fc_frame_payload_get(fp
, 0);
447 /* if this I/O is ddped, update xfer len */
448 fc_fcp_ddp_done(fsp
);
450 if (offset
+ len
> fsp
->data_len
) {
451 /* this should never happen */
452 if ((fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) &&
453 fc_frame_crc_check(fp
))
455 FC_FCP_DBG(fsp
, "data received past end. len %zx offset %zx "
456 "data_len %x\n", len
, offset
, fsp
->data_len
);
457 fc_fcp_retry_cmd(fsp
);
460 if (offset
!= fsp
->xfer_len
)
461 fsp
->state
|= FC_SRB_DISCONTIG
;
463 sg
= scsi_sglist(sc
);
464 nents
= scsi_sg_count(sc
);
466 if (!(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)) {
467 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
468 &offset
, KM_SOFTIRQ0
, NULL
);
470 crc
= crc32(~0, (u8
*) fh
, sizeof(*fh
));
471 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
472 &offset
, KM_SOFTIRQ0
, &crc
);
473 buf
= fc_frame_payload_get(fp
, 0);
475 crc
= crc32(crc
, buf
+ len
, 4 - (len
% 4));
477 if (~crc
!= le32_to_cpu(fr_crc(fp
))) {
479 stats
= fc_lport_get_stats(lport
);
480 stats
->ErrorFrames
++;
481 /* FIXME - per cpu count, not total count! */
482 if (stats
->InvalidCRCCount
++ < 5)
483 printk(KERN_WARNING
"libfc: CRC error on data "
484 "frame for port (%6x)\n",
485 fc_host_port_id(lport
->host
));
487 * Assume the frame is total garbage.
488 * We may have copied it over the good part
490 * If so, we need to retry the entire operation.
491 * Otherwise, ignore it.
493 if (fsp
->state
& FC_SRB_DISCONTIG
)
494 fc_fcp_retry_cmd(fsp
);
499 if (fsp
->xfer_contig_end
== start_offset
)
500 fsp
->xfer_contig_end
+= copy_len
;
501 fsp
->xfer_len
+= copy_len
;
504 * In the very rare event that this data arrived after the response
505 * and completes the transfer, call the completion handler.
507 if (unlikely(fsp
->state
& FC_SRB_RCV_STATUS
) &&
508 fsp
->xfer_len
== fsp
->data_len
- fsp
->scsi_resid
)
509 fc_fcp_complete_locked(fsp
);
513 * fc_fcp_send_data() - Send SCSI data to a target
514 * @fsp: The FCP packet the data is on
515 * @sp: The sequence the data is to be sent on
516 * @offset: The starting offset for this data request
517 * @seq_blen: The burst length for this data request
519 * Called after receiving a Transfer Ready data descriptor.
520 * If the LLD is capable of sequence offload then send down the
521 * seq_blen ammount of data in single frame, otherwise send
522 * multiple frames of the maximum frame payload supported by
525 static int fc_fcp_send_data(struct fc_fcp_pkt
*fsp
, struct fc_seq
*seq
,
526 size_t offset
, size_t seq_blen
)
529 struct scsi_cmnd
*sc
;
530 struct scatterlist
*sg
;
531 struct fc_frame
*fp
= NULL
;
532 struct fc_lport
*lport
= fsp
->lp
;
538 size_t frame_offset
, fh_parm_offset
;
543 int using_sg
= lport
->sg_supp
;
546 WARN_ON(seq_blen
<= 0);
547 if (unlikely(offset
+ seq_blen
> fsp
->data_len
)) {
548 /* this should never happen */
549 FC_FCP_DBG(fsp
, "xfer-ready past end. seq_blen %zx "
550 "offset %zx\n", seq_blen
, offset
);
551 fc_fcp_send_abort(fsp
);
553 } else if (offset
!= fsp
->xfer_len
) {
554 /* Out of Order Data Request - no problem, but unexpected. */
555 FC_FCP_DBG(fsp
, "xfer-ready non-contiguous. "
556 "seq_blen %zx offset %zx\n", seq_blen
, offset
);
560 * if LLD is capable of seq_offload then set transport
561 * burst length (t_blen) to seq_blen, otherwise set t_blen
562 * to max FC frame payload previously set in fsp->max_payload.
564 t_blen
= fsp
->max_payload
;
565 if (lport
->seq_offload
) {
566 t_blen
= min(seq_blen
, (size_t)lport
->lso_max
);
567 FC_FCP_DBG(fsp
, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
568 fsp
, seq_blen
, lport
->lso_max
, t_blen
);
571 WARN_ON(t_blen
< FC_MIN_MAX_PAYLOAD
);
573 t_blen
&= ~(512 - 1); /* round down to block size */
574 WARN_ON(t_blen
< FC_MIN_MAX_PAYLOAD
); /* won't go below 256 */
577 remaining
= seq_blen
;
578 fh_parm_offset
= frame_offset
= offset
;
580 seq
= lport
->tt
.seq_start_next(seq
);
581 f_ctl
= FC_FC_REL_OFF
;
584 sg
= scsi_sglist(sc
);
586 while (remaining
> 0 && sg
) {
587 if (offset
>= sg
->length
) {
588 offset
-= sg
->length
;
593 tlen
= min(t_blen
, remaining
);
596 * TODO. Temporary workaround. fc_seq_send() can't
597 * handle odd lengths in non-linear skbs.
598 * This will be the final fragment only.
602 fp
= fc_frame_alloc(lport
, using_sg
? 0 : tlen
);
606 data
= fc_frame_header_get(fp
) + 1;
607 fh_parm_offset
= frame_offset
;
608 fr_max_payload(fp
) = fsp
->max_payload
;
611 off
= offset
+ sg
->offset
;
612 sg_bytes
= min(tlen
, sg
->length
- offset
);
613 sg_bytes
= min(sg_bytes
,
614 (size_t) (PAGE_SIZE
- (off
& ~PAGE_MASK
)));
615 page
= sg_page(sg
) + (off
>> PAGE_SHIFT
);
618 skb_fill_page_desc(fp_skb(fp
),
619 skb_shinfo(fp_skb(fp
))->nr_frags
,
620 page
, off
& ~PAGE_MASK
, sg_bytes
);
621 fp_skb(fp
)->data_len
+= sg_bytes
;
622 fr_len(fp
) += sg_bytes
;
623 fp_skb(fp
)->truesize
+= PAGE_SIZE
;
626 * The scatterlist item may be bigger than PAGE_SIZE,
627 * but we must not cross pages inside the kmap.
629 page_addr
= kmap_atomic(page
, KM_SOFTIRQ0
);
630 memcpy(data
, (char *)page_addr
+ (off
& ~PAGE_MASK
),
632 kunmap_atomic(page_addr
, KM_SOFTIRQ0
);
636 frame_offset
+= sg_bytes
;
638 remaining
-= sg_bytes
;
640 if ((skb_shinfo(fp_skb(fp
))->nr_frags
< FC_FRAME_SG_LEN
) &&
645 * Send sequence with transfer sequence initiative in case
646 * this is last FCP frame of the sequence.
649 f_ctl
|= FC_FC_SEQ_INIT
| FC_FC_END_SEQ
;
651 ep
= fc_seq_exch(seq
);
652 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
653 FC_TYPE_FCP
, f_ctl
, fh_parm_offset
);
656 * send fragment using for a sequence.
658 error
= lport
->tt
.seq_send(lport
, seq
, fp
);
660 WARN_ON(1); /* send error should be rare */
661 fc_fcp_retry_cmd(fsp
);
666 fsp
->xfer_len
+= seq_blen
; /* premature count? */
671 * fc_fcp_abts_resp() - Send an ABTS response
672 * @fsp: The FCP packet that is being aborted
673 * @fp: The response frame
675 static void fc_fcp_abts_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
678 struct fc_ba_rjt
*brp
;
679 struct fc_frame_header
*fh
;
681 fh
= fc_frame_header_get(fp
);
682 switch (fh
->fh_r_ctl
) {
686 brp
= fc_frame_payload_get(fp
, sizeof(*brp
));
687 if (brp
&& brp
->br_reason
== FC_BA_RJT_LOG_ERR
)
692 * we will let the command timeout
693 * and scsi-ml recover in this case,
694 * therefore cleared the ba_done flag.
700 fsp
->state
|= FC_SRB_ABORTED
;
701 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
703 if (fsp
->wait_for_comp
)
704 complete(&fsp
->tm_done
);
706 fc_fcp_complete_locked(fsp
);
711 * fc_fcp_recv() - Reveive an FCP frame
712 * @seq: The sequence the frame is on
713 * @fp: The received frame
714 * @arg: The related FCP packet
716 * Context: Called from Soft IRQ context. Can not be called
717 * holding the FCP packet list lock.
719 static void fc_fcp_recv(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
721 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
722 struct fc_lport
*lport
= fsp
->lp
;
723 struct fc_frame_header
*fh
;
724 struct fcp_txrdy
*dd
;
729 fc_fcp_error(fsp
, fp
);
733 fh
= fc_frame_header_get(fp
);
734 r_ctl
= fh
->fh_r_ctl
;
736 if (!(lport
->state
& LPORT_ST_READY
))
738 if (fc_fcp_lock_pkt(fsp
))
740 fsp
->last_pkt_time
= jiffies
;
742 if (fh
->fh_type
== FC_TYPE_BLS
) {
743 fc_fcp_abts_resp(fsp
, fp
);
747 if (fsp
->state
& (FC_SRB_ABORTED
| FC_SRB_ABORT_PENDING
))
750 if (r_ctl
== FC_RCTL_DD_DATA_DESC
) {
752 * received XFER RDY from the target
753 * need to send data to the target
755 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
756 dd
= fc_frame_payload_get(fp
, sizeof(*dd
));
759 rc
= fc_fcp_send_data(fsp
, seq
,
760 (size_t) ntohl(dd
->ft_data_ro
),
761 (size_t) ntohl(dd
->ft_burst_len
));
763 seq
->rec_data
= fsp
->xfer_len
;
764 } else if (r_ctl
== FC_RCTL_DD_SOL_DATA
) {
766 * received a DATA frame
767 * next we will copy the data to the system buffer
769 WARN_ON(fr_len(fp
) < sizeof(*fh
)); /* len may be 0 */
770 fc_fcp_recv_data(fsp
, fp
);
771 seq
->rec_data
= fsp
->xfer_contig_end
;
772 } else if (r_ctl
== FC_RCTL_DD_CMD_STATUS
) {
773 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
775 fc_fcp_resp(fsp
, fp
);
777 FC_FCP_DBG(fsp
, "unexpected frame. r_ctl %x\n", r_ctl
);
780 fc_fcp_unlock_pkt(fsp
);
786 * fc_fcp_resp() - Handler for FCP responses
787 * @fsp: The FCP packet the response is for
788 * @fp: The response frame
790 static void fc_fcp_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
792 struct fc_frame_header
*fh
;
793 struct fcp_resp
*fc_rp
;
794 struct fcp_resp_ext
*rp_ex
;
795 struct fcp_resp_rsp_info
*fc_rp_info
;
803 fh
= (struct fc_frame_header
*)fr_hdr(fp
);
804 if (unlikely(plen
< sizeof(*fh
) + sizeof(*fc_rp
)))
807 fc_rp
= (struct fcp_resp
*)(fh
+ 1);
808 fsp
->cdb_status
= fc_rp
->fr_status
;
809 flags
= fc_rp
->fr_flags
;
810 fsp
->scsi_comp_flags
= flags
;
811 expected_len
= fsp
->data_len
;
813 /* if ddp, update xfer len */
814 fc_fcp_ddp_done(fsp
);
816 if (unlikely((flags
& ~FCP_CONF_REQ
) || fc_rp
->fr_status
)) {
817 rp_ex
= (void *)(fc_rp
+ 1);
818 if (flags
& (FCP_RSP_LEN_VAL
| FCP_SNS_LEN_VAL
)) {
819 if (plen
< sizeof(*fc_rp
) + sizeof(*rp_ex
))
821 fc_rp_info
= (struct fcp_resp_rsp_info
*)(rp_ex
+ 1);
822 if (flags
& FCP_RSP_LEN_VAL
) {
823 respl
= ntohl(rp_ex
->fr_rsp_len
);
824 if (respl
!= sizeof(*fc_rp_info
))
826 if (fsp
->wait_for_comp
) {
827 /* Abuse cdb_status for rsp code */
828 fsp
->cdb_status
= fc_rp_info
->rsp_code
;
829 complete(&fsp
->tm_done
);
831 * tmfs will not have any scsi cmd so
838 if (flags
& FCP_SNS_LEN_VAL
) {
839 snsl
= ntohl(rp_ex
->fr_sns_len
);
840 if (snsl
> SCSI_SENSE_BUFFERSIZE
)
841 snsl
= SCSI_SENSE_BUFFERSIZE
;
842 memcpy(fsp
->cmd
->sense_buffer
,
843 (char *)fc_rp_info
+ respl
, snsl
);
846 if (flags
& (FCP_RESID_UNDER
| FCP_RESID_OVER
)) {
847 if (plen
< sizeof(*fc_rp
) + sizeof(rp_ex
->fr_resid
))
849 if (flags
& FCP_RESID_UNDER
) {
850 fsp
->scsi_resid
= ntohl(rp_ex
->fr_resid
);
852 * The cmnd->underflow is the minimum number of
853 * bytes that must be transfered for this
854 * command. Provided a sense condition is not
855 * present, make sure the actual amount
856 * transferred is at least the underflow value
859 if (!(flags
& FCP_SNS_LEN_VAL
) &&
860 (fc_rp
->fr_status
== 0) &&
861 (scsi_bufflen(fsp
->cmd
) -
862 fsp
->scsi_resid
) < fsp
->cmd
->underflow
)
864 expected_len
-= fsp
->scsi_resid
;
866 fsp
->status_code
= FC_ERROR
;
870 fsp
->state
|= FC_SRB_RCV_STATUS
;
873 * Check for missing or extra data frames.
875 if (unlikely(fsp
->xfer_len
!= expected_len
)) {
876 if (fsp
->xfer_len
< expected_len
) {
878 * Some data may be queued locally,
879 * Wait a at least one jiffy to see if it is delivered.
880 * If this expires without data, we may do SRR.
882 fc_fcp_timer_set(fsp
, 2);
885 fsp
->status_code
= FC_DATA_OVRRUN
;
886 FC_FCP_DBG(fsp
, "tgt %6x xfer len %zx greater than expected, "
887 "len %x, data len %x\n",
889 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
891 fc_fcp_complete_locked(fsp
);
895 FC_FCP_DBG(fsp
, "short FCP response. flags 0x%x len %u respl %u "
896 "snsl %u\n", flags
, fr_len(fp
), respl
, snsl
);
898 fsp
->status_code
= FC_ERROR
;
899 fc_fcp_complete_locked(fsp
);
903 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
905 * @fsp: The FCP packet to be completed
907 * This function may sleep if a timer is pending. The packet lock must be
908 * held, and the host lock must not be held.
910 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*fsp
)
912 struct fc_lport
*lport
= fsp
->lp
;
917 if (fsp
->state
& FC_SRB_ABORT_PENDING
)
920 if (fsp
->state
& FC_SRB_ABORTED
) {
921 if (!fsp
->status_code
)
922 fsp
->status_code
= FC_CMD_ABORTED
;
925 * Test for transport underrun, independent of response
928 if (fsp
->xfer_len
< fsp
->data_len
&& !fsp
->io_status
&&
929 (!(fsp
->scsi_comp_flags
& FCP_RESID_UNDER
) ||
930 fsp
->xfer_len
< fsp
->data_len
- fsp
->scsi_resid
)) {
931 fsp
->status_code
= FC_DATA_UNDRUN
;
939 if (unlikely(fsp
->scsi_comp_flags
& FCP_CONF_REQ
)) {
940 struct fc_frame
*conf_frame
;
943 csp
= lport
->tt
.seq_start_next(seq
);
944 conf_frame
= fc_fcp_frame_alloc(fsp
->lp
, 0);
946 f_ctl
= FC_FC_SEQ_INIT
;
947 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
948 ep
= fc_seq_exch(seq
);
949 fc_fill_fc_hdr(conf_frame
, FC_RCTL_DD_SOL_CTL
,
951 FC_TYPE_FCP
, f_ctl
, 0);
952 lport
->tt
.seq_send(lport
, csp
, conf_frame
);
955 lport
->tt
.exch_done(seq
);
961 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
962 * @fsp: The FCP packet whose exchanges should be canceled
963 * @error: The reason for the cancellation
965 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt
*fsp
, int error
)
967 struct fc_lport
*lport
= fsp
->lp
;
970 lport
->tt
.exch_done(fsp
->seq_ptr
);
973 fsp
->status_code
= error
;
977 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
978 * @lport: The local port whose exchanges should be canceled
979 * @id: The target's ID
981 * @error: The reason for cancellation
983 * If lun or id is -1, they are ignored.
985 static void fc_fcp_cleanup_each_cmd(struct fc_lport
*lport
, unsigned int id
,
986 unsigned int lun
, int error
)
988 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
989 struct fc_fcp_pkt
*fsp
;
990 struct scsi_cmnd
*sc_cmd
;
993 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
995 list_for_each_entry(fsp
, &si
->scsi_pkt_queue
, list
) {
997 if (id
!= -1 && scmd_id(sc_cmd
) != id
)
1000 if (lun
!= -1 && sc_cmd
->device
->lun
!= lun
)
1003 fc_fcp_pkt_hold(fsp
);
1004 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1006 if (!fc_fcp_lock_pkt(fsp
)) {
1007 fc_fcp_cleanup_cmd(fsp
, error
);
1009 fc_fcp_unlock_pkt(fsp
);
1012 fc_fcp_pkt_release(fsp
);
1013 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
1015 * while we dropped the lock multiple pkts could
1016 * have been released, so we have to start over.
1020 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1024 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1025 * @lport: The local port whose exchanges are to be aborted
1027 static void fc_fcp_abort_io(struct fc_lport
*lport
)
1029 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_HRD_ERROR
);
1033 * fc_fcp_pkt_send() - Send a fcp_pkt
1034 * @lport: The local port to send the FCP packet on
1035 * @fsp: The FCP packet to send
1037 * Return: Zero for success and -1 for failure
1038 * Locks: Called with the host lock and irqs disabled.
1040 static int fc_fcp_pkt_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
)
1042 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1045 fsp
->cmd
->SCp
.ptr
= (char *)fsp
;
1046 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1047 fsp
->cdb_cmd
.fc_flags
= fsp
->req_flags
& ~FCP_CFL_LEN_MASK
;
1049 int_to_scsilun(fsp
->cmd
->device
->lun
,
1050 (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1051 memcpy(fsp
->cdb_cmd
.fc_cdb
, fsp
->cmd
->cmnd
, fsp
->cmd
->cmd_len
);
1052 list_add_tail(&fsp
->list
, &si
->scsi_pkt_queue
);
1054 spin_unlock_irq(lport
->host
->host_lock
);
1055 rc
= lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_fcp_recv
);
1056 spin_lock_irq(lport
->host
->host_lock
);
1058 list_del(&fsp
->list
);
1064 * fc_fcp_cmd_send() - Send a FCP command
1065 * @lport: The local port to send the command on
1066 * @fsp: The FCP packet the command is on
1067 * @resp: The handler for the response
1069 static int fc_fcp_cmd_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1070 void (*resp
)(struct fc_seq
*,
1071 struct fc_frame
*fp
,
1074 struct fc_frame
*fp
;
1076 struct fc_rport
*rport
;
1077 struct fc_rport_libfc_priv
*rpriv
;
1078 const size_t len
= sizeof(fsp
->cdb_cmd
);
1081 if (fc_fcp_lock_pkt(fsp
))
1084 fp
= fc_fcp_frame_alloc(lport
, sizeof(fsp
->cdb_cmd
));
1090 memcpy(fc_frame_payload_get(fp
, len
), &fsp
->cdb_cmd
, len
);
1093 fsp
->max_payload
= rport
->maxframe_size
;
1094 rpriv
= rport
->dd_data
;
1096 fc_fill_fc_hdr(fp
, FC_RCTL_DD_UNSOL_CMD
, rport
->port_id
,
1097 fc_host_port_id(rpriv
->local_port
->host
), FC_TYPE_FCP
,
1098 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1100 seq
= lport
->tt
.exch_seq_send(lport
, fp
, resp
, fc_fcp_pkt_destroy
,
1106 fsp
->last_pkt_time
= jiffies
;
1108 fc_fcp_pkt_hold(fsp
); /* hold for fc_fcp_pkt_destroy */
1110 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1111 fc_fcp_timer_set(fsp
,
1112 (fsp
->tgt_flags
& FC_RP_FLAGS_REC_SUPPORTED
) ?
1113 FC_SCSI_REC_TOV
: FC_SCSI_ER_TIMEOUT
);
1115 fc_fcp_unlock_pkt(fsp
);
1120 * fc_fcp_error() - Handler for FCP layer errors
1121 * @fsp: The FCP packet the error is on
1122 * @fp: The frame that has errored
1124 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1126 int error
= PTR_ERR(fp
);
1128 if (fc_fcp_lock_pkt(fsp
))
1131 if (error
== -FC_EX_CLOSED
) {
1132 fc_fcp_retry_cmd(fsp
);
1137 * clear abort pending, because the lower layer
1138 * decided to force completion.
1140 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
1141 fsp
->status_code
= FC_CMD_PLOGO
;
1142 fc_fcp_complete_locked(fsp
);
1144 fc_fcp_unlock_pkt(fsp
);
1148 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1149 * @fsp: The FCP packet to abort on
1151 * Called to send an abort and then wait for abort completion
1153 static int fc_fcp_pkt_abort(struct fc_fcp_pkt
*fsp
)
1157 if (fc_fcp_send_abort(fsp
))
1160 init_completion(&fsp
->tm_done
);
1161 fsp
->wait_for_comp
= 1;
1163 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1164 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1165 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1166 fsp
->wait_for_comp
= 0;
1169 FC_FCP_DBG(fsp
, "target abort cmd failed\n");
1171 } else if (fsp
->state
& FC_SRB_ABORTED
) {
1172 FC_FCP_DBG(fsp
, "target abort cmd passed\n");
1174 fc_fcp_complete_locked(fsp
);
1181 * fc_lun_reset_send() - Send LUN reset command
1182 * @data: The FCP packet that identifies the LUN to be reset
1184 static void fc_lun_reset_send(unsigned long data
)
1186 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1187 struct fc_lport
*lport
= fsp
->lp
;
1188 if (lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_tm_done
)) {
1189 if (fsp
->recov_retry
++ >= FC_MAX_RECOV_RETRY
)
1191 if (fc_fcp_lock_pkt(fsp
))
1193 setup_timer(&fsp
->timer
, fc_lun_reset_send
, (unsigned long)fsp
);
1194 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1195 fc_fcp_unlock_pkt(fsp
);
1200 * fc_lun_reset() - Send a LUN RESET command to a device
1201 * and wait for the reply
1202 * @lport: The local port to sent the comand on
1203 * @fsp: The FCP packet that identifies the LUN to be reset
1204 * @id: The SCSI command ID
1205 * @lun: The LUN ID to be reset
1207 static int fc_lun_reset(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1208 unsigned int id
, unsigned int lun
)
1212 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1213 fsp
->cdb_cmd
.fc_tm_flags
= FCP_TMF_LUN_RESET
;
1214 int_to_scsilun(lun
, (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1216 fsp
->wait_for_comp
= 1;
1217 init_completion(&fsp
->tm_done
);
1219 fc_lun_reset_send((unsigned long)fsp
);
1222 * wait for completion of reset
1223 * after that make sure all commands are terminated
1225 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1227 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1228 fsp
->state
|= FC_SRB_COMPL
;
1229 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1231 del_timer_sync(&fsp
->timer
);
1233 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1235 lport
->tt
.exch_done(fsp
->seq_ptr
);
1236 fsp
->seq_ptr
= NULL
;
1238 fsp
->wait_for_comp
= 0;
1239 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1242 FC_SCSI_DBG(lport
, "lun reset failed\n");
1246 /* cdb_status holds the tmf's rsp code */
1247 if (fsp
->cdb_status
!= FCP_TMF_CMPL
)
1250 FC_SCSI_DBG(lport
, "lun reset to lun %u completed\n", lun
);
1251 fc_fcp_cleanup_each_cmd(lport
, id
, lun
, FC_CMD_ABORTED
);
1256 * fc_tm_done() - Task Managment response handler
1257 * @seq: The sequence that the response is on
1258 * @fp: The response frame
1259 * @arg: The FCP packet the response is for
1261 static void fc_tm_done(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1263 struct fc_fcp_pkt
*fsp
= arg
;
1264 struct fc_frame_header
*fh
;
1268 * If there is an error just let it timeout or wait
1269 * for TMF to be aborted if it timedout.
1271 * scsi-eh will escalate for when either happens.
1276 if (fc_fcp_lock_pkt(fsp
))
1280 * raced with eh timeout handler.
1282 if (!fsp
->seq_ptr
|| !fsp
->wait_for_comp
) {
1283 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1287 fh
= fc_frame_header_get(fp
);
1288 if (fh
->fh_type
!= FC_TYPE_BLS
)
1289 fc_fcp_resp(fsp
, fp
);
1290 fsp
->seq_ptr
= NULL
;
1291 fsp
->lp
->tt
.exch_done(seq
);
1293 fc_fcp_unlock_pkt(fsp
);
1297 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1298 * @lport: The local port to be cleaned up
1300 static void fc_fcp_cleanup(struct fc_lport
*lport
)
1302 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_ERROR
);
1306 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1307 * @data: The FCP packet that has timed out
1309 * If REC is supported then just issue it and return. The REC exchange will
1310 * complete or time out and recovery can continue at that point. Otherwise,
1311 * if the response has been received without all the data it has been
1312 * ER_TIMEOUT since the response was received. If the response has not been
1313 * received we see if data was received recently. If it has been then we
1314 * continue waiting, otherwise, we abort the command.
1316 static void fc_fcp_timeout(unsigned long data
)
1318 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1319 struct fc_rport
*rport
= fsp
->rport
;
1320 struct fc_rport_libfc_priv
*rpriv
= rport
->dd_data
;
1322 if (fc_fcp_lock_pkt(fsp
))
1325 if (fsp
->cdb_cmd
.fc_tm_flags
)
1328 fsp
->state
|= FC_SRB_FCP_PROCESSING_TMO
;
1330 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1332 else if (time_after_eq(fsp
->last_pkt_time
+ (FC_SCSI_ER_TIMEOUT
/ 2),
1334 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1335 else if (fsp
->state
& FC_SRB_RCV_STATUS
)
1336 fc_fcp_complete_locked(fsp
);
1338 fc_timeout_error(fsp
);
1339 fsp
->state
&= ~FC_SRB_FCP_PROCESSING_TMO
;
1341 fc_fcp_unlock_pkt(fsp
);
1345 * fc_fcp_rec() - Send a REC ELS request
1346 * @fsp: The FCP packet to send the REC request on
1348 static void fc_fcp_rec(struct fc_fcp_pkt
*fsp
)
1350 struct fc_lport
*lport
;
1351 struct fc_frame
*fp
;
1352 struct fc_rport
*rport
;
1353 struct fc_rport_libfc_priv
*rpriv
;
1357 rpriv
= rport
->dd_data
;
1358 if (!fsp
->seq_ptr
|| rpriv
->rp_state
!= RPORT_ST_READY
) {
1359 fsp
->status_code
= FC_HRD_ERROR
;
1361 fc_fcp_complete_locked(fsp
);
1364 fp
= fc_fcp_frame_alloc(lport
, sizeof(struct fc_els_rec
));
1368 fr_seq(fp
) = fsp
->seq_ptr
;
1369 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, rport
->port_id
,
1370 fc_host_port_id(rpriv
->local_port
->host
), FC_TYPE_ELS
,
1371 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1372 if (lport
->tt
.elsct_send(lport
, rport
->port_id
, fp
, ELS_REC
,
1373 fc_fcp_rec_resp
, fsp
,
1374 jiffies_to_msecs(FC_SCSI_REC_TOV
))) {
1375 fc_fcp_pkt_hold(fsp
); /* hold while REC outstanding */
1379 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1380 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1382 fc_timeout_error(fsp
);
1386 * fc_fcp_rec_resp() - Handler for REC ELS responses
1387 * @seq: The sequence the response is on
1388 * @fp: The response frame
1389 * @arg: The FCP packet the response is on
1391 * If the response is a reject then the scsi layer will handle
1392 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1393 * set the timeout and return. If the I/O was completed then complete the
1394 * exchange and tell the SCSI layer.
1396 static void fc_fcp_rec_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1398 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
1399 struct fc_els_rec_acc
*recp
;
1400 struct fc_els_ls_rjt
*rjt
;
1404 enum dma_data_direction data_dir
;
1406 struct fc_rport_libfc_priv
*rpriv
;
1409 fc_fcp_rec_error(fsp
, fp
);
1413 if (fc_fcp_lock_pkt(fsp
))
1416 fsp
->recov_retry
= 0;
1417 opcode
= fc_frame_payload_op(fp
);
1418 if (opcode
== ELS_LS_RJT
) {
1419 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1420 switch (rjt
->er_reason
) {
1422 FC_FCP_DBG(fsp
, "device %x unexpected REC reject "
1423 "reason %d expl %d\n",
1424 fsp
->rport
->port_id
, rjt
->er_reason
,
1428 FC_FCP_DBG(fsp
, "device does not support REC\n");
1429 rpriv
= fsp
->rport
->dd_data
;
1431 * if we do not spport RECs or got some bogus
1432 * reason then resetup timer so we check for
1435 rpriv
->flags
&= ~FC_RP_FLAGS_REC_SUPPORTED
;
1436 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1441 * If no data transfer, the command frame got dropped
1442 * so we just retry. If data was transferred, we
1443 * lost the response but the target has no record,
1444 * so we abort and retry.
1446 if (rjt
->er_explan
== ELS_EXPL_OXID_RXID
&&
1447 fsp
->xfer_len
== 0) {
1448 fc_fcp_retry_cmd(fsp
);
1451 fc_timeout_error(fsp
);
1454 } else if (opcode
== ELS_LS_ACC
) {
1455 if (fsp
->state
& FC_SRB_ABORTED
)
1458 data_dir
= fsp
->cmd
->sc_data_direction
;
1459 recp
= fc_frame_payload_get(fp
, sizeof(*recp
));
1460 offset
= ntohl(recp
->reca_fc4value
);
1461 e_stat
= ntohl(recp
->reca_e_stat
);
1463 if (e_stat
& ESB_ST_COMPLETE
) {
1466 * The exchange is complete.
1468 * For output, we must've lost the response.
1469 * For input, all data must've been sent.
1470 * We lost may have lost the response
1471 * (and a confirmation was requested) and maybe
1474 * If all data received, send SRR
1475 * asking for response. If partial data received,
1476 * or gaps, SRR requests data at start of gap.
1477 * Recovery via SRR relies on in-order-delivery.
1479 if (data_dir
== DMA_TO_DEVICE
) {
1480 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1481 } else if (fsp
->xfer_contig_end
== offset
) {
1482 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1484 offset
= fsp
->xfer_contig_end
;
1485 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1487 fc_fcp_srr(fsp
, r_ctl
, offset
);
1488 } else if (e_stat
& ESB_ST_SEQ_INIT
) {
1491 * The remote port has the initiative, so just
1492 * keep waiting for it to complete.
1494 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1498 * The exchange is incomplete, we have seq. initiative.
1499 * Lost response with requested confirmation,
1500 * lost confirmation, lost transfer ready or
1503 * For output, if not all data was received, ask
1504 * for transfer ready to be repeated.
1506 * If we received or sent all the data, send SRR to
1509 * If we lost a response, we may have lost some read
1512 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1513 if (data_dir
== DMA_TO_DEVICE
) {
1514 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1515 if (offset
< fsp
->data_len
)
1516 r_ctl
= FC_RCTL_DD_DATA_DESC
;
1517 } else if (offset
== fsp
->xfer_contig_end
) {
1518 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1519 } else if (fsp
->xfer_contig_end
< offset
) {
1520 offset
= fsp
->xfer_contig_end
;
1522 fc_fcp_srr(fsp
, r_ctl
, offset
);
1526 fc_fcp_unlock_pkt(fsp
);
1528 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1533 * fc_fcp_rec_error() - Handler for REC errors
1534 * @fsp: The FCP packet the error is on
1535 * @fp: The REC frame
1537 static void fc_fcp_rec_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1539 int error
= PTR_ERR(fp
);
1541 if (fc_fcp_lock_pkt(fsp
))
1546 fc_fcp_retry_cmd(fsp
);
1550 FC_FCP_DBG(fsp
, "REC %p fid %x error unexpected error %d\n",
1551 fsp
, fsp
->rport
->port_id
, error
);
1552 fsp
->status_code
= FC_CMD_PLOGO
;
1555 case -FC_EX_TIMEOUT
:
1557 * Assume REC or LS_ACC was lost.
1558 * The exchange manager will have aborted REC, so retry.
1560 FC_FCP_DBG(fsp
, "REC fid %x error error %d retry %d/%d\n",
1561 fsp
->rport
->port_id
, error
, fsp
->recov_retry
,
1562 FC_MAX_RECOV_RETRY
);
1563 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1566 fc_timeout_error(fsp
);
1569 fc_fcp_unlock_pkt(fsp
);
1571 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1575 * fc_timeout_error() - Handler for fcp_pkt timeouts
1576 * @fsp: The FCP packt that has timed out
1578 static void fc_timeout_error(struct fc_fcp_pkt
*fsp
)
1580 fsp
->status_code
= FC_CMD_TIME_OUT
;
1581 fsp
->cdb_status
= 0;
1584 * if this fails then we let the scsi command timer fire and
1587 fc_fcp_send_abort(fsp
);
1591 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1592 * @fsp: The FCP packet the SRR is to be sent on
1593 * @r_ctl: The R_CTL field for the SRR request
1594 * This is called after receiving status but insufficient data, or
1595 * when expecting status but the request has timed out.
1597 static void fc_fcp_srr(struct fc_fcp_pkt
*fsp
, enum fc_rctl r_ctl
, u32 offset
)
1599 struct fc_lport
*lport
= fsp
->lp
;
1600 struct fc_rport
*rport
;
1601 struct fc_rport_libfc_priv
*rpriv
;
1602 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1604 struct fcp_srr
*srr
;
1605 struct fc_frame
*fp
;
1609 rpriv
= rport
->dd_data
;
1610 cdb_op
= fsp
->cdb_cmd
.fc_cdb
[0];
1612 if (!(rpriv
->flags
& FC_RP_FLAGS_RETRY
) ||
1613 rpriv
->rp_state
!= RPORT_ST_READY
)
1614 goto retry
; /* shouldn't happen */
1615 fp
= fc_fcp_frame_alloc(lport
, sizeof(*srr
));
1619 srr
= fc_frame_payload_get(fp
, sizeof(*srr
));
1620 memset(srr
, 0, sizeof(*srr
));
1621 srr
->srr_op
= ELS_SRR
;
1622 srr
->srr_ox_id
= htons(ep
->oxid
);
1623 srr
->srr_rx_id
= htons(ep
->rxid
);
1624 srr
->srr_r_ctl
= r_ctl
;
1625 srr
->srr_rel_off
= htonl(offset
);
1627 fc_fill_fc_hdr(fp
, FC_RCTL_ELS4_REQ
, rport
->port_id
,
1628 fc_host_port_id(rpriv
->local_port
->host
), FC_TYPE_FCP
,
1629 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1631 seq
= lport
->tt
.exch_seq_send(lport
, fp
, fc_fcp_srr_resp
, NULL
,
1632 fsp
, jiffies_to_msecs(FC_SCSI_REC_TOV
));
1636 fsp
->recov_seq
= seq
;
1637 fsp
->xfer_len
= offset
;
1638 fsp
->xfer_contig_end
= offset
;
1639 fsp
->state
&= ~FC_SRB_RCV_STATUS
;
1640 fc_fcp_pkt_hold(fsp
); /* hold for outstanding SRR */
1643 fc_fcp_retry_cmd(fsp
);
1647 * fc_fcp_srr_resp() - Handler for SRR response
1648 * @seq: The sequence the SRR is on
1649 * @fp: The SRR frame
1650 * @arg: The FCP packet the SRR is on
1652 static void fc_fcp_srr_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1654 struct fc_fcp_pkt
*fsp
= arg
;
1655 struct fc_frame_header
*fh
;
1658 fc_fcp_srr_error(fsp
, fp
);
1662 if (fc_fcp_lock_pkt(fsp
))
1665 fh
= fc_frame_header_get(fp
);
1667 * BUG? fc_fcp_srr_error calls exch_done which would release
1668 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1669 * then fc_exch_timeout would be sending an abort. The exch_done
1670 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1671 * an abort response though.
1673 if (fh
->fh_type
== FC_TYPE_BLS
) {
1674 fc_fcp_unlock_pkt(fsp
);
1678 fsp
->recov_seq
= NULL
;
1679 switch (fc_frame_payload_op(fp
)) {
1681 fsp
->recov_retry
= 0;
1682 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1686 fc_timeout_error(fsp
);
1689 fc_fcp_unlock_pkt(fsp
);
1690 fsp
->lp
->tt
.exch_done(seq
);
1693 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1697 * fc_fcp_srr_error() - Handler for SRR errors
1698 * @fsp: The FCP packet that the SRR error is on
1699 * @fp: The SRR frame
1701 static void fc_fcp_srr_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1703 if (fc_fcp_lock_pkt(fsp
))
1705 fsp
->lp
->tt
.exch_done(fsp
->recov_seq
);
1706 fsp
->recov_seq
= NULL
;
1707 switch (PTR_ERR(fp
)) {
1708 case -FC_EX_TIMEOUT
:
1709 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1712 fc_timeout_error(fsp
);
1714 case -FC_EX_CLOSED
: /* e.g., link failure */
1717 fc_fcp_retry_cmd(fsp
);
1720 fc_fcp_unlock_pkt(fsp
);
1722 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1726 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1727 * @lport: The local port to be checked
1729 static inline int fc_fcp_lport_queue_ready(struct fc_lport
*lport
)
1732 return (lport
->state
== LPORT_ST_READY
) &&
1733 lport
->link_up
&& !lport
->qfull
;
1737 * fc_queuecommand() - The queuecommand function of the SCSI template
1738 * @cmd: The scsi_cmnd to be executed
1739 * @done: The callback function to be called when the scsi_cmnd is complete
1741 * This is the i/o strategy routine, called by the SCSI layer. This routine
1742 * is called with the host_lock held.
1744 int fc_queuecommand(struct scsi_cmnd
*sc_cmd
, void (*done
)(struct scsi_cmnd
*))
1746 struct fc_lport
*lport
;
1747 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1748 struct fc_fcp_pkt
*fsp
;
1749 struct fc_rport_libfc_priv
*rpriv
;
1752 struct fcoe_dev_stats
*stats
;
1754 lport
= shost_priv(sc_cmd
->device
->host
);
1756 rval
= fc_remote_port_chkready(rport
);
1758 sc_cmd
->result
= rval
;
1763 if (!*(struct fc_remote_port
**)rport
->dd_data
) {
1765 * rport is transitioning from blocked/deleted to
1768 sc_cmd
->result
= DID_IMM_RETRY
<< 16;
1773 rpriv
= rport
->dd_data
;
1775 if (!fc_fcp_lport_queue_ready(lport
)) {
1777 fc_fcp_can_queue_ramp_down(lport
);
1778 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1782 fsp
= fc_fcp_pkt_alloc(lport
, GFP_ATOMIC
);
1784 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1789 * build the libfc request pkt
1791 fsp
->cmd
= sc_cmd
; /* save the cmd */
1792 fsp
->lp
= lport
; /* save the softc ptr */
1793 fsp
->rport
= rport
; /* set the remote port ptr */
1794 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
1795 sc_cmd
->scsi_done
= done
;
1798 * set up the transfer length
1800 fsp
->data_len
= scsi_bufflen(sc_cmd
);
1804 * setup the data direction
1806 stats
= fc_lport_get_stats(lport
);
1807 if (sc_cmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
1808 fsp
->req_flags
= FC_SRB_READ
;
1809 stats
->InputRequests
++;
1810 stats
->InputMegabytes
= fsp
->data_len
;
1811 } else if (sc_cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1812 fsp
->req_flags
= FC_SRB_WRITE
;
1813 stats
->OutputRequests
++;
1814 stats
->OutputMegabytes
= fsp
->data_len
;
1817 stats
->ControlRequests
++;
1820 fsp
->tgt_flags
= rpriv
->flags
;
1822 init_timer(&fsp
->timer
);
1823 fsp
->timer
.data
= (unsigned long)fsp
;
1826 * send it to the lower layer
1827 * if we get -1 return then put the request in the pending
1830 rval
= fc_fcp_pkt_send(lport
, fsp
);
1832 fsp
->state
= FC_SRB_FREE
;
1833 fc_fcp_pkt_release(fsp
);
1834 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1839 EXPORT_SYMBOL(fc_queuecommand
);
1842 * fc_io_compl() - Handle responses for completed commands
1843 * @fsp: The FCP packet that is complete
1845 * Translates fcp_pkt errors to a Linux SCSI errors.
1846 * The fcp packet lock must be held when calling.
1848 static void fc_io_compl(struct fc_fcp_pkt
*fsp
)
1850 struct fc_fcp_internal
*si
;
1851 struct scsi_cmnd
*sc_cmd
;
1852 struct fc_lport
*lport
;
1853 unsigned long flags
;
1855 /* release outstanding ddp context */
1856 fc_fcp_ddp_done(fsp
);
1858 fsp
->state
|= FC_SRB_COMPL
;
1859 if (!(fsp
->state
& FC_SRB_FCP_PROCESSING_TMO
)) {
1860 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1861 del_timer_sync(&fsp
->timer
);
1862 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1866 si
= fc_get_scsi_internal(lport
);
1867 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
1869 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1874 * if can_queue ramp down is done then try can_queue ramp up
1875 * since commands are completing now.
1877 if (si
->last_can_queue_ramp_down_time
)
1878 fc_fcp_can_queue_ramp_up(lport
);
1883 if (!sc_cmd
->SCp
.ptr
) {
1884 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1888 CMD_SCSI_STATUS(sc_cmd
) = fsp
->cdb_status
;
1889 switch (fsp
->status_code
) {
1891 if (fsp
->cdb_status
== 0) {
1895 sc_cmd
->result
= DID_OK
<< 16;
1896 if (fsp
->scsi_resid
)
1897 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1900 * transport level I/O was ok but scsi
1901 * has non zero status
1903 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
1907 sc_cmd
->result
= DID_ERROR
<< 16;
1909 case FC_DATA_UNDRUN
:
1910 if ((fsp
->cdb_status
== 0) && !(fsp
->req_flags
& FC_SRB_READ
)) {
1912 * scsi status is good but transport level
1915 sc_cmd
->result
= (fsp
->state
& FC_SRB_RCV_STATUS
?
1916 DID_OK
: DID_ERROR
) << 16;
1919 * scsi got underrun, this is an error
1921 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1922 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1925 case FC_DATA_OVRRUN
:
1927 * overrun is an error
1929 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1931 case FC_CMD_ABORTED
:
1932 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->io_status
;
1934 case FC_CMD_TIME_OUT
:
1935 sc_cmd
->result
= (DID_BUS_BUSY
<< 16) | fsp
->io_status
;
1938 sc_cmd
->result
= (DID_RESET
<< 16);
1941 sc_cmd
->result
= (DID_NO_CONNECT
<< 16);
1944 sc_cmd
->result
= (DID_ERROR
<< 16);
1948 list_del(&fsp
->list
);
1949 sc_cmd
->SCp
.ptr
= NULL
;
1950 sc_cmd
->scsi_done(sc_cmd
);
1951 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1953 /* release ref from initial allocation in queue command */
1954 fc_fcp_pkt_release(fsp
);
1958 * fc_eh_abort() - Abort a command
1959 * @sc_cmd: The SCSI command to abort
1961 * From SCSI host template.
1962 * Send an ABTS to the target device and wait for the response.
1964 int fc_eh_abort(struct scsi_cmnd
*sc_cmd
)
1966 struct fc_fcp_pkt
*fsp
;
1967 struct fc_lport
*lport
;
1969 unsigned long flags
;
1971 lport
= shost_priv(sc_cmd
->device
->host
);
1972 if (lport
->state
!= LPORT_ST_READY
)
1974 else if (!lport
->link_up
)
1977 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
1978 fsp
= CMD_SP(sc_cmd
);
1980 /* command completed while scsi eh was setting up */
1981 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1984 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1985 fc_fcp_pkt_hold(fsp
);
1986 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
1988 if (fc_fcp_lock_pkt(fsp
)) {
1989 /* completed while we were waiting for timer to be deleted */
1994 rc
= fc_fcp_pkt_abort(fsp
);
1995 fc_fcp_unlock_pkt(fsp
);
1998 fc_fcp_pkt_release(fsp
);
2001 EXPORT_SYMBOL(fc_eh_abort
);
2004 * fc_eh_device_reset() - Reset a single LUN
2005 * @sc_cmd: The SCSI command which identifies the device whose
2006 * LUN is to be reset
2008 * Set from SCSI host template.
2010 int fc_eh_device_reset(struct scsi_cmnd
*sc_cmd
)
2012 struct fc_lport
*lport
;
2013 struct fc_fcp_pkt
*fsp
;
2014 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
2018 rval
= fc_remote_port_chkready(rport
);
2022 lport
= shost_priv(sc_cmd
->device
->host
);
2024 if (lport
->state
!= LPORT_ST_READY
)
2027 FC_SCSI_DBG(lport
, "Resetting rport (%6x)\n", rport
->port_id
);
2029 fsp
= fc_fcp_pkt_alloc(lport
, GFP_NOIO
);
2031 printk(KERN_WARNING
"libfc: could not allocate scsi_pkt\n");
2036 * Build the libfc request pkt. Do not set the scsi cmnd, because
2037 * the sc passed in is not setup for execution like when sent
2038 * through the queuecommand callout.
2040 fsp
->lp
= lport
; /* save the softc ptr */
2041 fsp
->rport
= rport
; /* set the remote port ptr */
2044 * flush outstanding commands
2046 rc
= fc_lun_reset(lport
, fsp
, scmd_id(sc_cmd
), sc_cmd
->device
->lun
);
2047 fsp
->state
= FC_SRB_FREE
;
2048 fc_fcp_pkt_release(fsp
);
2053 EXPORT_SYMBOL(fc_eh_device_reset
);
2056 * fc_eh_host_reset() - Reset a Scsi_Host.
2057 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2059 int fc_eh_host_reset(struct scsi_cmnd
*sc_cmd
)
2061 struct Scsi_Host
*shost
= sc_cmd
->device
->host
;
2062 struct fc_lport
*lport
= shost_priv(shost
);
2063 unsigned long wait_tmo
;
2065 FC_SCSI_DBG(lport
, "Resetting host\n");
2067 lport
->tt
.lport_reset(lport
);
2068 wait_tmo
= jiffies
+ FC_HOST_RESET_TIMEOUT
;
2069 while (!fc_fcp_lport_queue_ready(lport
) && time_before(jiffies
,
2073 if (fc_fcp_lport_queue_ready(lport
)) {
2074 shost_printk(KERN_INFO
, shost
, "libfc: Host reset succeeded "
2075 "on port (%6x)\n", fc_host_port_id(lport
->host
));
2078 shost_printk(KERN_INFO
, shost
, "libfc: Host reset failed, "
2079 "port (%6x) is not ready.\n",
2080 fc_host_port_id(lport
->host
));
2084 EXPORT_SYMBOL(fc_eh_host_reset
);
2087 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2088 * @sdev: The SCSI device that identifies the SCSI host
2090 * Configures queue depth based on host's cmd_per_len. If not set
2091 * then we use the libfc default.
2093 int fc_slave_alloc(struct scsi_device
*sdev
)
2095 struct fc_rport
*rport
= starget_to_rport(scsi_target(sdev
));
2097 if (!rport
|| fc_remote_port_chkready(rport
))
2100 if (sdev
->tagged_supported
)
2101 scsi_activate_tcq(sdev
, FC_FCP_DFLT_QUEUE_DEPTH
);
2103 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
),
2104 FC_FCP_DFLT_QUEUE_DEPTH
);
2108 EXPORT_SYMBOL(fc_slave_alloc
);
2111 * fc_change_queue_depth() - Change a device's queue depth
2112 * @sdev: The SCSI device whose queue depth is to change
2113 * @qdepth: The new queue depth
2114 * @reason: The resason for the change
2116 int fc_change_queue_depth(struct scsi_device
*sdev
, int qdepth
, int reason
)
2119 case SCSI_QDEPTH_DEFAULT
:
2120 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2122 case SCSI_QDEPTH_QFULL
:
2123 scsi_track_queue_full(sdev
, qdepth
);
2125 case SCSI_QDEPTH_RAMP_UP
:
2126 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2131 return sdev
->queue_depth
;
2133 EXPORT_SYMBOL(fc_change_queue_depth
);
2136 * fc_change_queue_type() - Change a device's queue type
2137 * @sdev: The SCSI device whose queue depth is to change
2138 * @tag_type: Identifier for queue type
2140 int fc_change_queue_type(struct scsi_device
*sdev
, int tag_type
)
2142 if (sdev
->tagged_supported
) {
2143 scsi_set_tag_type(sdev
, tag_type
);
2145 scsi_activate_tcq(sdev
, sdev
->queue_depth
);
2147 scsi_deactivate_tcq(sdev
, sdev
->queue_depth
);
2153 EXPORT_SYMBOL(fc_change_queue_type
);
2156 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2157 * @lport: The local port that no longer needs the FCP layer
2159 void fc_fcp_destroy(struct fc_lport
*lport
)
2161 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
2163 if (!list_empty(&si
->scsi_pkt_queue
))
2164 printk(KERN_ERR
"libfc: Leaked SCSI packets when destroying "
2165 "port (%6x)\n", fc_host_port_id(lport
->host
));
2167 mempool_destroy(si
->scsi_pkt_pool
);
2169 lport
->scsi_priv
= NULL
;
2171 EXPORT_SYMBOL(fc_fcp_destroy
);
2177 scsi_pkt_cachep
= kmem_cache_create("libfc_fcp_pkt",
2178 sizeof(struct fc_fcp_pkt
),
2179 0, SLAB_HWCACHE_ALIGN
, NULL
);
2180 if (!scsi_pkt_cachep
) {
2181 printk(KERN_ERR
"libfc: Unable to allocate SRB cache, "
2182 "module load failed!");
2189 void fc_destroy_fcp()
2191 if (scsi_pkt_cachep
)
2192 kmem_cache_destroy(scsi_pkt_cachep
);
2196 * fc_fcp_init() - Initialize the FCP layer for a local port
2197 * @lport: The local port to initialize the exchange layer for
2199 int fc_fcp_init(struct fc_lport
*lport
)
2202 struct fc_fcp_internal
*si
;
2204 if (!lport
->tt
.fcp_cmd_send
)
2205 lport
->tt
.fcp_cmd_send
= fc_fcp_cmd_send
;
2207 if (!lport
->tt
.fcp_cleanup
)
2208 lport
->tt
.fcp_cleanup
= fc_fcp_cleanup
;
2210 if (!lport
->tt
.fcp_abort_io
)
2211 lport
->tt
.fcp_abort_io
= fc_fcp_abort_io
;
2213 si
= kzalloc(sizeof(struct fc_fcp_internal
), GFP_KERNEL
);
2216 lport
->scsi_priv
= si
;
2217 si
->max_can_queue
= lport
->host
->can_queue
;
2218 INIT_LIST_HEAD(&si
->scsi_pkt_queue
);
2220 si
->scsi_pkt_pool
= mempool_create_slab_pool(2, scsi_pkt_cachep
);
2221 if (!si
->scsi_pkt_pool
) {
2231 EXPORT_SYMBOL(fc_fcp_init
);