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>
42 MODULE_AUTHOR("Open-FCoE.org");
43 MODULE_DESCRIPTION("libfc");
44 MODULE_LICENSE("GPL");
46 static int fc_fcp_debug
;
48 #define FC_DEBUG_FCP(fmt...) \
54 static struct kmem_cache
*scsi_pkt_cachep
;
56 /* SRB state definitions */
57 #define FC_SRB_FREE 0 /* cmd is free */
58 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
59 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
60 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
61 #define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */
62 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
63 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
64 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
65 #define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */
67 #define FC_SRB_READ (1 << 1)
68 #define FC_SRB_WRITE (1 << 0)
71 * The SCp.ptr should be tested and set under the host lock. NULL indicates
72 * that the command has been retruned to the scsi layer.
74 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
75 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
76 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
77 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
78 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
80 struct fc_fcp_internal
{
81 mempool_t
*scsi_pkt_pool
;
82 struct list_head scsi_pkt_queue
;
86 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
90 * FC scsi I/O related functions
92 static void fc_fcp_recv_data(struct fc_fcp_pkt
*, struct fc_frame
*);
93 static void fc_fcp_recv(struct fc_seq
*, struct fc_frame
*, void *);
94 static void fc_fcp_resp(struct fc_fcp_pkt
*, struct fc_frame
*);
95 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*);
96 static void fc_tm_done(struct fc_seq
*, struct fc_frame
*, void *);
97 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
);
98 static void fc_timeout_error(struct fc_fcp_pkt
*);
99 static void fc_fcp_timeout(unsigned long data
);
100 static void fc_fcp_rec(struct fc_fcp_pkt
*);
101 static void fc_fcp_rec_error(struct fc_fcp_pkt
*, struct fc_frame
*);
102 static void fc_fcp_rec_resp(struct fc_seq
*, struct fc_frame
*, void *);
103 static void fc_io_compl(struct fc_fcp_pkt
*);
105 static void fc_fcp_srr(struct fc_fcp_pkt
*, enum fc_rctl
, u32
);
106 static void fc_fcp_srr_resp(struct fc_seq
*, struct fc_frame
*, void *);
107 static void fc_fcp_srr_error(struct fc_fcp_pkt
*, struct fc_frame
*);
110 * command status codes
112 #define FC_COMPLETE 0
113 #define FC_CMD_ABORTED 1
114 #define FC_CMD_RESET 2
115 #define FC_CMD_PLOGO 3
117 #define FC_TRANS_ERR 5
118 #define FC_DATA_OVRRUN 6
119 #define FC_DATA_UNDRUN 7
121 #define FC_HRD_ERROR 9
122 #define FC_CMD_TIME_OUT 10
125 * Error recovery timeout values.
127 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
128 #define FC_SCSI_TM_TOV (10 * HZ)
129 #define FC_SCSI_REC_TOV (2 * HZ)
130 #define FC_HOST_RESET_TIMEOUT (30 * 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 - allocation routine for scsi_pkt packet
139 * @lp: fc lport struct
140 * @gfp: gfp flags for allocation
142 * This is used by upper layer scsi driver.
143 * Return Value : scsi_pkt structure or null on allocation failure.
144 * Context : call from process context. no locking required.
146 static struct fc_fcp_pkt
*fc_fcp_pkt_alloc(struct fc_lport
*lp
, gfp_t gfp
)
148 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lp
);
149 struct fc_fcp_pkt
*fsp
;
151 fsp
= mempool_alloc(si
->scsi_pkt_pool
, gfp
);
153 memset(fsp
, 0, sizeof(*fsp
));
155 atomic_set(&fsp
->ref_cnt
, 1);
156 init_timer(&fsp
->timer
);
157 INIT_LIST_HEAD(&fsp
->list
);
158 spin_lock_init(&fsp
->scsi_pkt_lock
);
164 * fc_fcp_pkt_release() - release hold on scsi_pkt packet
165 * @fsp: fcp packet struct
167 * This is used by upper layer scsi driver.
168 * Context : call from process and interrupt context.
169 * no locking 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
);
180 static void fc_fcp_pkt_hold(struct fc_fcp_pkt
*fsp
)
182 atomic_inc(&fsp
->ref_cnt
);
186 * fc_fcp_pkt_destory() - release hold on scsi_pkt packet
187 * @seq: exchange sequence
188 * @fsp: fcp packet struct
190 * Release hold on scsi_pkt packet set to keep scsi_pkt
191 * till EM layer exch resource is not freed.
192 * Context : called from from EM layer.
193 * no locking required
195 static void fc_fcp_pkt_destroy(struct fc_seq
*seq
, void *fsp
)
197 fc_fcp_pkt_release(fsp
);
201 * fc_fcp_lock_pkt() - lock a packet and get a ref to it.
204 * We should only return error if we return a command to scsi-ml before
205 * getting a response. This can happen in cases where we send a abort, but
206 * do not wait for the response and the abort and command can be passing
207 * each other on the wire/network-layer.
209 * Note: this function locks the packet and gets a reference to allow
210 * callers to call the completion function while the lock is held and
211 * not have to worry about the packets refcount.
213 * TODO: Maybe we should just have callers grab/release the lock and
214 * have a function that they call to verify the fsp and grab a ref if
217 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt
*fsp
)
219 spin_lock_bh(&fsp
->scsi_pkt_lock
);
220 if (fsp
->state
& FC_SRB_COMPL
) {
221 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
225 fc_fcp_pkt_hold(fsp
);
229 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt
*fsp
)
231 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
232 fc_fcp_pkt_release(fsp
);
235 static void fc_fcp_timer_set(struct fc_fcp_pkt
*fsp
, unsigned long delay
)
237 if (!(fsp
->state
& FC_SRB_COMPL
))
238 mod_timer(&fsp
->timer
, jiffies
+ delay
);
241 static int fc_fcp_send_abort(struct fc_fcp_pkt
*fsp
)
246 fsp
->state
|= FC_SRB_ABORT_PENDING
;
247 return fsp
->lp
->tt
.seq_exch_abort(fsp
->seq_ptr
, 0);
252 * An abort isn't needed.
254 static void fc_fcp_retry_cmd(struct fc_fcp_pkt
*fsp
)
257 fsp
->lp
->tt
.exch_done(fsp
->seq_ptr
);
261 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
263 fsp
->status_code
= FC_ERROR
;
264 fc_fcp_complete_locked(fsp
);
268 * Receive SCSI data from target.
269 * Called after receiving solicited data.
271 static void fc_fcp_recv_data(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
273 struct scsi_cmnd
*sc
= fsp
->cmd
;
274 struct fc_lport
*lp
= fsp
->lp
;
275 struct fcoe_dev_stats
*stats
;
276 struct fc_frame_header
*fh
;
283 struct scatterlist
*sg
;
286 fh
= fc_frame_header_get(fp
);
287 offset
= ntohl(fh
->fh_parm_offset
);
288 start_offset
= offset
;
289 len
= fr_len(fp
) - sizeof(*fh
);
290 buf
= fc_frame_payload_get(fp
, 0);
292 if (offset
+ len
> fsp
->data_len
) {
293 /* this should never happen */
294 if ((fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) &&
295 fc_frame_crc_check(fp
))
297 FC_DEBUG_FCP("data received past end. len %zx offset %zx "
298 "data_len %x\n", len
, offset
, fsp
->data_len
);
299 fc_fcp_retry_cmd(fsp
);
302 if (offset
!= fsp
->xfer_len
)
303 fsp
->state
|= FC_SRB_DISCONTIG
;
306 if (fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)
307 crc
= crc32(~0, (u8
*) fh
, sizeof(*fh
));
309 sg
= scsi_sglist(sc
);
312 while (remaining
> 0 && sg
) {
317 if (offset
>= sg
->length
) {
318 offset
-= sg
->length
;
322 sg_bytes
= min(remaining
, sg
->length
- offset
);
325 * The scatterlist item may be bigger than PAGE_SIZE,
326 * but we are limited to mapping PAGE_SIZE at a time.
328 off
= offset
+ sg
->offset
;
329 sg_bytes
= min(sg_bytes
, (size_t)
330 (PAGE_SIZE
- (off
& ~PAGE_MASK
)));
331 page_addr
= kmap_atomic(sg_page(sg
) + (off
>> PAGE_SHIFT
),
334 break; /* XXX panic? */
336 if (fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)
337 crc
= crc32(crc
, buf
, sg_bytes
);
338 memcpy((char *)page_addr
+ (off
& ~PAGE_MASK
), buf
,
341 kunmap_atomic(page_addr
, KM_SOFTIRQ0
);
344 remaining
-= sg_bytes
;
345 copy_len
+= sg_bytes
;
348 if (fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) {
349 buf
= fc_frame_payload_get(fp
, 0);
351 crc
= crc32(crc
, buf
+ len
, 4 - (len
% 4));
352 len
+= 4 - (len
% 4);
355 if (~crc
!= le32_to_cpu(fr_crc(fp
))) {
357 stats
= lp
->dev_stats
[smp_processor_id()];
358 stats
->ErrorFrames
++;
359 if (stats
->InvalidCRCCount
++ < 5)
360 FC_DBG("CRC error on data frame\n");
362 * Assume the frame is total garbage.
363 * We may have copied it over the good part
365 * If so, we need to retry the entire operation.
366 * Otherwise, ignore it.
368 if (fsp
->state
& FC_SRB_DISCONTIG
)
369 fc_fcp_retry_cmd(fsp
);
374 if (fsp
->xfer_contig_end
== start_offset
)
375 fsp
->xfer_contig_end
+= copy_len
;
376 fsp
->xfer_len
+= copy_len
;
379 * In the very rare event that this data arrived after the response
380 * and completes the transfer, call the completion handler.
382 if (unlikely(fsp
->state
& FC_SRB_RCV_STATUS
) &&
383 fsp
->xfer_len
== fsp
->data_len
- fsp
->scsi_resid
)
384 fc_fcp_complete_locked(fsp
);
388 * fc_fcp_send_data() - Send SCSI data to target.
389 * @fsp: ptr to fc_fcp_pkt
390 * @sp: ptr to this sequence
391 * @offset: starting offset for this data request
392 * @seq_blen: the burst length for this data request
394 * Called after receiving a Transfer Ready data descriptor.
395 * if LLD is capable of seq offload then send down seq_blen
396 * size of data in single frame, otherwise send multiple FC
397 * frames of max FC frame payload supported by target port.
399 * Returns : 0 for success.
401 static int fc_fcp_send_data(struct fc_fcp_pkt
*fsp
, struct fc_seq
*seq
,
402 size_t offset
, size_t seq_blen
)
405 struct scsi_cmnd
*sc
;
406 struct scatterlist
*sg
;
407 struct fc_frame
*fp
= NULL
;
408 struct fc_lport
*lp
= fsp
->lp
;
413 size_t frame_offset
, fh_parm_offset
;
417 int using_sg
= lp
->sg_supp
;
420 WARN_ON(seq_blen
<= 0);
421 if (unlikely(offset
+ seq_blen
> fsp
->data_len
)) {
422 /* this should never happen */
423 FC_DEBUG_FCP("xfer-ready past end. seq_blen %zx offset %zx\n",
425 fc_fcp_send_abort(fsp
);
427 } else if (offset
!= fsp
->xfer_len
) {
428 /* Out of Order Data Request - no problem, but unexpected. */
429 FC_DEBUG_FCP("xfer-ready non-contiguous. "
430 "seq_blen %zx offset %zx\n", seq_blen
, offset
);
434 * if LLD is capable of seq_offload then set transport
435 * burst length (t_blen) to seq_blen, otherwise set t_blen
436 * to max FC frame payload previously set in fsp->max_payload.
438 t_blen
= lp
->seq_offload
? seq_blen
: fsp
->max_payload
;
439 WARN_ON(t_blen
< FC_MIN_MAX_PAYLOAD
);
441 t_blen
&= ~(512 - 1); /* round down to block size */
442 WARN_ON(t_blen
< FC_MIN_MAX_PAYLOAD
); /* won't go below 256 */
445 remaining
= seq_blen
;
446 fh_parm_offset
= frame_offset
= offset
;
448 seq
= lp
->tt
.seq_start_next(seq
);
449 f_ctl
= FC_FC_REL_OFF
;
453 * If a get_page()/put_page() will fail, don't use sg lists
454 * in the fc_frame structure.
456 * The put_page() may be long after the I/O has completed
457 * in the case of FCoE, since the network driver does it
458 * via free_skb(). See the test in free_pages_check().
460 * Test this case with 'dd </dev/zero >/dev/st0 bs=64k'.
463 for (sg
= scsi_sglist(sc
); sg
; sg
= sg_next(sg
)) {
464 if (page_count(sg_page(sg
)) == 0 ||
465 (sg_page(sg
)->flags
& (1 << PG_lru
|
479 sg
= scsi_sglist(sc
);
481 while (remaining
> 0 && sg
) {
482 if (offset
>= sg
->length
) {
483 offset
-= sg
->length
;
488 tlen
= min(t_blen
, remaining
);
491 * TODO. Temporary workaround. fc_seq_send() can't
492 * handle odd lengths in non-linear skbs.
493 * This will be the final fragment only.
498 fp
= _fc_frame_alloc(lp
, 0);
502 fp
= fc_frame_alloc(lp
, tlen
);
506 data
= (void *)(fr_hdr(fp
)) +
507 sizeof(struct fc_frame_header
);
509 fh_parm_offset
= frame_offset
;
510 fr_max_payload(fp
) = fsp
->max_payload
;
512 sg_bytes
= min(tlen
, sg
->length
- offset
);
514 WARN_ON(skb_shinfo(fp_skb(fp
))->nr_frags
>
516 get_page(sg_page(sg
));
517 skb_fill_page_desc(fp_skb(fp
),
518 skb_shinfo(fp_skb(fp
))->nr_frags
,
519 sg_page(sg
), sg
->offset
+ offset
,
521 fp_skb(fp
)->data_len
+= sg_bytes
;
522 fr_len(fp
) += sg_bytes
;
523 fp_skb(fp
)->truesize
+= PAGE_SIZE
;
525 size_t off
= offset
+ sg
->offset
;
528 * The scatterlist item may be bigger than PAGE_SIZE,
529 * but we must not cross pages inside the kmap.
531 sg_bytes
= min(sg_bytes
, (size_t) (PAGE_SIZE
-
532 (off
& ~PAGE_MASK
)));
533 page_addr
= kmap_atomic(sg_page(sg
) +
536 memcpy(data
, (char *)page_addr
+ (off
& ~PAGE_MASK
),
538 kunmap_atomic(page_addr
, KM_SOFTIRQ0
);
542 frame_offset
+= sg_bytes
;
544 remaining
-= sg_bytes
;
550 * Send sequence with transfer sequence initiative in case
551 * this is last FCP frame of the sequence.
554 f_ctl
|= FC_FC_SEQ_INIT
| FC_FC_END_SEQ
;
556 ep
= fc_seq_exch(seq
);
557 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
558 FC_TYPE_FCP
, f_ctl
, fh_parm_offset
);
561 * send fragment using for a sequence.
563 error
= lp
->tt
.seq_send(lp
, seq
, fp
);
565 WARN_ON(1); /* send error should be rare */
566 fc_fcp_retry_cmd(fsp
);
571 fsp
->xfer_len
+= seq_blen
; /* premature count? */
575 static void fc_fcp_abts_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
578 struct fc_ba_rjt
*brp
;
579 struct fc_frame_header
*fh
;
581 fh
= fc_frame_header_get(fp
);
582 switch (fh
->fh_r_ctl
) {
586 brp
= fc_frame_payload_get(fp
, sizeof(*brp
));
587 if (brp
&& brp
->br_reason
== FC_BA_RJT_LOG_ERR
)
592 * we will let the command timeout
593 * and scsi-ml recover in this case,
594 * therefore cleared the ba_done flag.
600 fsp
->state
|= FC_SRB_ABORTED
;
601 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
603 if (fsp
->wait_for_comp
)
604 complete(&fsp
->tm_done
);
606 fc_fcp_complete_locked(fsp
);
611 * fc_fcp_reduce_can_queue() - drop can_queue
612 * @lp: lport to drop queueing for
614 * If we are getting memory allocation failures, then we may
615 * be trying to execute too many commands. We let the running
616 * commands complete or timeout, then try again with a reduced
617 * can_queue. Eventually we will hit the point where we run
618 * on all reserved structs.
620 static void fc_fcp_reduce_can_queue(struct fc_lport
*lp
)
622 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lp
);
626 spin_lock_irqsave(lp
->host
->host_lock
, flags
);
631 can_queue
= lp
->host
->can_queue
;
635 lp
->host
->can_queue
= can_queue
;
636 shost_printk(KERN_ERR
, lp
->host
, "Could not allocate frame.\n"
637 "Reducing can_queue to %d.\n", can_queue
);
639 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
643 * fc_fcp_recv() - Reveive FCP frames
644 * @seq: The sequence the frame is on
646 * @arg: The related FCP packet
649 * Context : called from Soft IRQ context
650 * can not called holding list lock
652 static void fc_fcp_recv(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
654 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
656 struct fc_frame_header
*fh
;
657 struct fcp_txrdy
*dd
;
664 fh
= fc_frame_header_get(fp
);
665 r_ctl
= fh
->fh_r_ctl
;
668 if (!(lp
->state
& LPORT_ST_READY
))
670 if (fc_fcp_lock_pkt(fsp
))
672 fsp
->last_pkt_time
= jiffies
;
674 if (fh
->fh_type
== FC_TYPE_BLS
) {
675 fc_fcp_abts_resp(fsp
, fp
);
679 if (fsp
->state
& (FC_SRB_ABORTED
| FC_SRB_ABORT_PENDING
))
682 if (r_ctl
== FC_RCTL_DD_DATA_DESC
) {
684 * received XFER RDY from the target
685 * need to send data to the target
687 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
688 dd
= fc_frame_payload_get(fp
, sizeof(*dd
));
691 rc
= fc_fcp_send_data(fsp
, seq
,
692 (size_t) ntohl(dd
->ft_data_ro
),
693 (size_t) ntohl(dd
->ft_burst_len
));
695 seq
->rec_data
= fsp
->xfer_len
;
696 else if (rc
== -ENOMEM
)
697 fsp
->state
|= FC_SRB_NOMEM
;
698 } else if (r_ctl
== FC_RCTL_DD_SOL_DATA
) {
700 * received a DATA frame
701 * next we will copy the data to the system buffer
703 WARN_ON(fr_len(fp
) < sizeof(*fh
)); /* len may be 0 */
704 fc_fcp_recv_data(fsp
, fp
);
705 seq
->rec_data
= fsp
->xfer_contig_end
;
706 } else if (r_ctl
== FC_RCTL_DD_CMD_STATUS
) {
707 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
709 fc_fcp_resp(fsp
, fp
);
711 FC_DBG("unexpected frame. r_ctl %x\n", r_ctl
);
714 fc_fcp_unlock_pkt(fsp
);
719 fc_fcp_error(fsp
, fp
);
720 else if (rc
== -ENOMEM
)
721 fc_fcp_reduce_can_queue(lp
);
724 static void fc_fcp_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
726 struct fc_frame_header
*fh
;
727 struct fcp_resp
*fc_rp
;
728 struct fcp_resp_ext
*rp_ex
;
729 struct fcp_resp_rsp_info
*fc_rp_info
;
737 fh
= (struct fc_frame_header
*)fr_hdr(fp
);
738 if (unlikely(plen
< sizeof(*fh
) + sizeof(*fc_rp
)))
741 fc_rp
= (struct fcp_resp
*)(fh
+ 1);
742 fsp
->cdb_status
= fc_rp
->fr_status
;
743 flags
= fc_rp
->fr_flags
;
744 fsp
->scsi_comp_flags
= flags
;
745 expected_len
= fsp
->data_len
;
747 if (unlikely((flags
& ~FCP_CONF_REQ
) || fc_rp
->fr_status
)) {
748 rp_ex
= (void *)(fc_rp
+ 1);
749 if (flags
& (FCP_RSP_LEN_VAL
| FCP_SNS_LEN_VAL
)) {
750 if (plen
< sizeof(*fc_rp
) + sizeof(*rp_ex
))
752 fc_rp_info
= (struct fcp_resp_rsp_info
*)(rp_ex
+ 1);
753 if (flags
& FCP_RSP_LEN_VAL
) {
754 respl
= ntohl(rp_ex
->fr_rsp_len
);
755 if (respl
!= sizeof(*fc_rp_info
))
757 if (fsp
->wait_for_comp
) {
758 /* Abuse cdb_status for rsp code */
759 fsp
->cdb_status
= fc_rp_info
->rsp_code
;
760 complete(&fsp
->tm_done
);
762 * tmfs will not have any scsi cmd so
769 if (flags
& FCP_SNS_LEN_VAL
) {
770 snsl
= ntohl(rp_ex
->fr_sns_len
);
771 if (snsl
> SCSI_SENSE_BUFFERSIZE
)
772 snsl
= SCSI_SENSE_BUFFERSIZE
;
773 memcpy(fsp
->cmd
->sense_buffer
,
774 (char *)fc_rp_info
+ respl
, snsl
);
777 if (flags
& (FCP_RESID_UNDER
| FCP_RESID_OVER
)) {
778 if (plen
< sizeof(*fc_rp
) + sizeof(rp_ex
->fr_resid
))
780 if (flags
& FCP_RESID_UNDER
) {
781 fsp
->scsi_resid
= ntohl(rp_ex
->fr_resid
);
783 * The cmnd->underflow is the minimum number of
784 * bytes that must be transfered for this
785 * command. Provided a sense condition is not
786 * present, make sure the actual amount
787 * transferred is at least the underflow value
790 if (!(flags
& FCP_SNS_LEN_VAL
) &&
791 (fc_rp
->fr_status
== 0) &&
792 (scsi_bufflen(fsp
->cmd
) -
793 fsp
->scsi_resid
) < fsp
->cmd
->underflow
)
795 expected_len
-= fsp
->scsi_resid
;
797 fsp
->status_code
= FC_ERROR
;
801 fsp
->state
|= FC_SRB_RCV_STATUS
;
804 * Check for missing or extra data frames.
806 if (unlikely(fsp
->xfer_len
!= expected_len
)) {
807 if (fsp
->xfer_len
< expected_len
) {
809 * Some data may be queued locally,
810 * Wait a at least one jiffy to see if it is delivered.
811 * If this expires without data, we may do SRR.
813 fc_fcp_timer_set(fsp
, 2);
816 fsp
->status_code
= FC_DATA_OVRRUN
;
817 FC_DBG("tgt %6x xfer len %zx greater than expected len %x. "
820 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
822 fc_fcp_complete_locked(fsp
);
826 FC_DBG("short FCP response. flags 0x%x len %u respl %u snsl %u\n",
827 flags
, fr_len(fp
), respl
, snsl
);
829 fsp
->status_code
= FC_ERROR
;
830 fc_fcp_complete_locked(fsp
);
834 * fc_fcp_complete_locked() - complete processing of a fcp packet
837 * This function may sleep if a timer is pending. The packet lock must be
838 * held, and the host lock must not be held.
840 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*fsp
)
842 struct fc_lport
*lp
= fsp
->lp
;
847 if (fsp
->state
& FC_SRB_ABORT_PENDING
)
850 if (fsp
->state
& FC_SRB_ABORTED
) {
851 if (!fsp
->status_code
)
852 fsp
->status_code
= FC_CMD_ABORTED
;
855 * Test for transport underrun, independent of response
858 if (fsp
->xfer_len
< fsp
->data_len
&& !fsp
->io_status
&&
859 (!(fsp
->scsi_comp_flags
& FCP_RESID_UNDER
) ||
860 fsp
->xfer_len
< fsp
->data_len
- fsp
->scsi_resid
)) {
861 fsp
->status_code
= FC_DATA_UNDRUN
;
869 if (unlikely(fsp
->scsi_comp_flags
& FCP_CONF_REQ
)) {
870 struct fc_frame
*conf_frame
;
873 csp
= lp
->tt
.seq_start_next(seq
);
874 conf_frame
= fc_frame_alloc(fsp
->lp
, 0);
876 f_ctl
= FC_FC_SEQ_INIT
;
877 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
878 ep
= fc_seq_exch(seq
);
879 fc_fill_fc_hdr(conf_frame
, FC_RCTL_DD_SOL_CTL
,
881 FC_TYPE_FCP
, f_ctl
, 0);
882 lp
->tt
.seq_send(lp
, csp
, conf_frame
);
885 lp
->tt
.exch_done(seq
);
890 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt
*fsp
, int error
)
892 struct fc_lport
*lp
= fsp
->lp
;
895 lp
->tt
.exch_done(fsp
->seq_ptr
);
898 fsp
->status_code
= error
;
902 * fc_fcp_cleanup_each_cmd() - Cleanup active commads
906 * @error: fsp status code
908 * If lun or id is -1, they are ignored.
910 static void fc_fcp_cleanup_each_cmd(struct fc_lport
*lp
, unsigned int id
,
911 unsigned int lun
, int error
)
913 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lp
);
914 struct fc_fcp_pkt
*fsp
;
915 struct scsi_cmnd
*sc_cmd
;
918 spin_lock_irqsave(lp
->host
->host_lock
, flags
);
920 list_for_each_entry(fsp
, &si
->scsi_pkt_queue
, list
) {
922 if (id
!= -1 && scmd_id(sc_cmd
) != id
)
925 if (lun
!= -1 && sc_cmd
->device
->lun
!= lun
)
928 fc_fcp_pkt_hold(fsp
);
929 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
931 if (!fc_fcp_lock_pkt(fsp
)) {
932 fc_fcp_cleanup_cmd(fsp
, error
);
934 fc_fcp_unlock_pkt(fsp
);
937 fc_fcp_pkt_release(fsp
);
938 spin_lock_irqsave(lp
->host
->host_lock
, flags
);
940 * while we dropped the lock multiple pkts could
941 * have been released, so we have to start over.
945 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
948 static void fc_fcp_abort_io(struct fc_lport
*lp
)
950 fc_fcp_cleanup_each_cmd(lp
, -1, -1, FC_HRD_ERROR
);
954 * fc_fcp_pkt_send() - send a fcp packet to the lower level.
958 * This is called by upper layer protocol.
959 * Return : zero for success and -1 for failure
960 * Context : called from queuecommand which can be called from process
962 * Locks : called with the host lock and irqs disabled.
964 static int fc_fcp_pkt_send(struct fc_lport
*lp
, struct fc_fcp_pkt
*fsp
)
966 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lp
);
969 fsp
->cmd
->SCp
.ptr
= (char *)fsp
;
970 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
971 fsp
->cdb_cmd
.fc_flags
= fsp
->req_flags
& ~FCP_CFL_LEN_MASK
;
973 int_to_scsilun(fsp
->cmd
->device
->lun
,
974 (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
975 memcpy(fsp
->cdb_cmd
.fc_cdb
, fsp
->cmd
->cmnd
, fsp
->cmd
->cmd_len
);
976 list_add_tail(&fsp
->list
, &si
->scsi_pkt_queue
);
978 spin_unlock_irq(lp
->host
->host_lock
);
979 rc
= lp
->tt
.fcp_cmd_send(lp
, fsp
, fc_fcp_recv
);
980 spin_lock_irq(lp
->host
->host_lock
);
982 list_del(&fsp
->list
);
987 static int fc_fcp_cmd_send(struct fc_lport
*lp
, struct fc_fcp_pkt
*fsp
,
988 void (*resp
)(struct fc_seq
*,
994 struct fc_rport
*rport
;
995 struct fc_rport_libfc_priv
*rp
;
996 const size_t len
= sizeof(fsp
->cdb_cmd
);
999 if (fc_fcp_lock_pkt(fsp
))
1002 fp
= fc_frame_alloc(lp
, sizeof(fsp
->cdb_cmd
));
1008 memcpy(fc_frame_payload_get(fp
, len
), &fsp
->cdb_cmd
, len
);
1009 fr_cmd(fp
) = fsp
->cmd
;
1011 fsp
->max_payload
= rport
->maxframe_size
;
1012 rp
= rport
->dd_data
;
1014 fc_fill_fc_hdr(fp
, FC_RCTL_DD_UNSOL_CMD
, rport
->port_id
,
1015 fc_host_port_id(rp
->local_port
->host
), FC_TYPE_FCP
,
1016 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1018 seq
= lp
->tt
.exch_seq_send(lp
, fp
, resp
, fc_fcp_pkt_destroy
, fsp
, 0);
1024 fsp
->last_pkt_time
= jiffies
;
1026 fc_fcp_pkt_hold(fsp
); /* hold for fc_fcp_pkt_destroy */
1028 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1029 fc_fcp_timer_set(fsp
,
1030 (fsp
->tgt_flags
& FC_RP_FLAGS_REC_SUPPORTED
) ?
1031 FC_SCSI_REC_TOV
: FC_SCSI_ER_TIMEOUT
);
1033 fc_fcp_unlock_pkt(fsp
);
1038 * transport error handler
1040 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1042 int error
= PTR_ERR(fp
);
1044 if (fc_fcp_lock_pkt(fsp
))
1049 fc_fcp_retry_cmd(fsp
);
1052 FC_DBG("unknown error %ld\n", PTR_ERR(fp
));
1055 * clear abort pending, because the lower layer
1056 * decided to force completion.
1058 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
1059 fsp
->status_code
= FC_CMD_PLOGO
;
1060 fc_fcp_complete_locked(fsp
);
1062 fc_fcp_unlock_pkt(fsp
);
1066 * Scsi abort handler- calls to send an abort
1067 * and then wait for abort completion
1069 static int fc_fcp_pkt_abort(struct fc_lport
*lp
, struct fc_fcp_pkt
*fsp
)
1073 if (fc_fcp_send_abort(fsp
))
1076 init_completion(&fsp
->tm_done
);
1077 fsp
->wait_for_comp
= 1;
1079 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1080 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1081 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1082 fsp
->wait_for_comp
= 0;
1085 FC_DBG("target abort cmd failed\n");
1087 } else if (fsp
->state
& FC_SRB_ABORTED
) {
1088 FC_DBG("target abort cmd passed\n");
1090 fc_fcp_complete_locked(fsp
);
1097 * Retry LUN reset after resource allocation failed.
1099 static void fc_lun_reset_send(unsigned long data
)
1101 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1102 struct fc_lport
*lp
= fsp
->lp
;
1103 if (lp
->tt
.fcp_cmd_send(lp
, fsp
, fc_tm_done
)) {
1104 if (fsp
->recov_retry
++ >= FC_MAX_RECOV_RETRY
)
1106 if (fc_fcp_lock_pkt(fsp
))
1108 setup_timer(&fsp
->timer
, fc_lun_reset_send
, (unsigned long)fsp
);
1109 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1110 fc_fcp_unlock_pkt(fsp
);
1115 * Scsi device reset handler- send a LUN RESET to the device
1116 * and wait for reset reply
1118 static int fc_lun_reset(struct fc_lport
*lp
, struct fc_fcp_pkt
*fsp
,
1119 unsigned int id
, unsigned int lun
)
1123 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1124 fsp
->cdb_cmd
.fc_tm_flags
= FCP_TMF_LUN_RESET
;
1125 int_to_scsilun(lun
, (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1127 fsp
->wait_for_comp
= 1;
1128 init_completion(&fsp
->tm_done
);
1130 fc_lun_reset_send((unsigned long)fsp
);
1133 * wait for completion of reset
1134 * after that make sure all commands are terminated
1136 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1138 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1139 fsp
->state
|= FC_SRB_COMPL
;
1140 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1142 del_timer_sync(&fsp
->timer
);
1144 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1146 lp
->tt
.exch_done(fsp
->seq_ptr
);
1147 fsp
->seq_ptr
= NULL
;
1149 fsp
->wait_for_comp
= 0;
1150 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1153 FC_DBG("lun reset failed\n");
1157 /* cdb_status holds the tmf's rsp code */
1158 if (fsp
->cdb_status
!= FCP_TMF_CMPL
)
1161 FC_DBG("lun reset to lun %u completed\n", lun
);
1162 fc_fcp_cleanup_each_cmd(lp
, id
, lun
, FC_CMD_ABORTED
);
1167 * Task Managment response handler
1169 static void fc_tm_done(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1171 struct fc_fcp_pkt
*fsp
= arg
;
1172 struct fc_frame_header
*fh
;
1176 * If there is an error just let it timeout or wait
1177 * for TMF to be aborted if it timedout.
1179 * scsi-eh will escalate for when either happens.
1184 if (fc_fcp_lock_pkt(fsp
))
1188 * raced with eh timeout handler.
1190 if (!fsp
->seq_ptr
|| !fsp
->wait_for_comp
) {
1191 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1195 fh
= fc_frame_header_get(fp
);
1196 if (fh
->fh_type
!= FC_TYPE_BLS
)
1197 fc_fcp_resp(fsp
, fp
);
1198 fsp
->seq_ptr
= NULL
;
1199 fsp
->lp
->tt
.exch_done(seq
);
1201 fc_fcp_unlock_pkt(fsp
);
1204 static void fc_fcp_cleanup(struct fc_lport
*lp
)
1206 fc_fcp_cleanup_each_cmd(lp
, -1, -1, FC_ERROR
);
1210 * fc_fcp_timeout: called by OS timer function.
1212 * The timer has been inactivated and must be reactivated if desired
1213 * using fc_fcp_timer_set().
1217 * If REC is supported, just issue it, and return. The REC exchange will
1218 * complete or time out, and recovery can continue at that point.
1220 * Otherwise, if the response has been received without all the data,
1221 * it has been ER_TIMEOUT since the response was received.
1223 * If the response has not been received,
1224 * we see if data was received recently. If it has been, we continue waiting,
1225 * otherwise, we abort the command.
1227 static void fc_fcp_timeout(unsigned long data
)
1229 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1230 struct fc_rport
*rport
= fsp
->rport
;
1231 struct fc_rport_libfc_priv
*rp
= rport
->dd_data
;
1233 if (fc_fcp_lock_pkt(fsp
))
1236 if (fsp
->cdb_cmd
.fc_tm_flags
)
1239 fsp
->state
|= FC_SRB_FCP_PROCESSING_TMO
;
1241 if (rp
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1243 else if (time_after_eq(fsp
->last_pkt_time
+ (FC_SCSI_ER_TIMEOUT
/ 2),
1245 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1246 else if (fsp
->state
& FC_SRB_RCV_STATUS
)
1247 fc_fcp_complete_locked(fsp
);
1249 fc_timeout_error(fsp
);
1250 fsp
->state
&= ~FC_SRB_FCP_PROCESSING_TMO
;
1252 fc_fcp_unlock_pkt(fsp
);
1256 * Send a REC ELS request
1258 static void fc_fcp_rec(struct fc_fcp_pkt
*fsp
)
1260 struct fc_lport
*lp
;
1261 struct fc_frame
*fp
;
1262 struct fc_rport
*rport
;
1263 struct fc_rport_libfc_priv
*rp
;
1267 rp
= rport
->dd_data
;
1268 if (!fsp
->seq_ptr
|| rp
->rp_state
!= RPORT_ST_READY
) {
1269 fsp
->status_code
= FC_HRD_ERROR
;
1271 fc_fcp_complete_locked(fsp
);
1274 fp
= fc_frame_alloc(lp
, sizeof(struct fc_els_rec
));
1278 fr_seq(fp
) = fsp
->seq_ptr
;
1279 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, rport
->port_id
,
1280 fc_host_port_id(rp
->local_port
->host
), FC_TYPE_ELS
,
1281 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1282 if (lp
->tt
.elsct_send(lp
, rport
, fp
, ELS_REC
, fc_fcp_rec_resp
,
1283 fsp
, jiffies_to_msecs(FC_SCSI_REC_TOV
))) {
1284 fc_fcp_pkt_hold(fsp
); /* hold while REC outstanding */
1289 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1290 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1292 fc_timeout_error(fsp
);
1296 * Receive handler for REC ELS frame
1297 * if it is a reject then let the scsi layer to handle
1298 * the timeout. if it is a LS_ACC then if the io was not completed
1299 * then set the timeout and return otherwise complete the exchange
1300 * and tell the scsi layer to restart the I/O.
1302 static void fc_fcp_rec_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1304 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
1305 struct fc_els_rec_acc
*recp
;
1306 struct fc_els_ls_rjt
*rjt
;
1310 enum dma_data_direction data_dir
;
1312 struct fc_rport_libfc_priv
*rp
;
1315 fc_fcp_rec_error(fsp
, fp
);
1319 if (fc_fcp_lock_pkt(fsp
))
1322 fsp
->recov_retry
= 0;
1323 opcode
= fc_frame_payload_op(fp
);
1324 if (opcode
== ELS_LS_RJT
) {
1325 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1326 switch (rjt
->er_reason
) {
1328 FC_DEBUG_FCP("device %x unexpected REC reject "
1329 "reason %d expl %d\n",
1330 fsp
->rport
->port_id
, rjt
->er_reason
,
1334 FC_DEBUG_FCP("device does not support REC\n");
1335 rp
= fsp
->rport
->dd_data
;
1337 * if we do not spport RECs or got some bogus
1338 * reason then resetup timer so we check for
1341 rp
->flags
&= ~FC_RP_FLAGS_REC_SUPPORTED
;
1342 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1347 * If no data transfer, the command frame got dropped
1348 * so we just retry. If data was transferred, we
1349 * lost the response but the target has no record,
1350 * so we abort and retry.
1352 if (rjt
->er_explan
== ELS_EXPL_OXID_RXID
&&
1353 fsp
->xfer_len
== 0) {
1354 fc_fcp_retry_cmd(fsp
);
1357 fc_timeout_error(fsp
);
1360 } else if (opcode
== ELS_LS_ACC
) {
1361 if (fsp
->state
& FC_SRB_ABORTED
)
1364 data_dir
= fsp
->cmd
->sc_data_direction
;
1365 recp
= fc_frame_payload_get(fp
, sizeof(*recp
));
1366 offset
= ntohl(recp
->reca_fc4value
);
1367 e_stat
= ntohl(recp
->reca_e_stat
);
1369 if (e_stat
& ESB_ST_COMPLETE
) {
1372 * The exchange is complete.
1374 * For output, we must've lost the response.
1375 * For input, all data must've been sent.
1376 * We lost may have lost the response
1377 * (and a confirmation was requested) and maybe
1380 * If all data received, send SRR
1381 * asking for response. If partial data received,
1382 * or gaps, SRR requests data at start of gap.
1383 * Recovery via SRR relies on in-order-delivery.
1385 if (data_dir
== DMA_TO_DEVICE
) {
1386 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1387 } else if (fsp
->xfer_contig_end
== offset
) {
1388 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1390 offset
= fsp
->xfer_contig_end
;
1391 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1393 fc_fcp_srr(fsp
, r_ctl
, offset
);
1394 } else if (e_stat
& ESB_ST_SEQ_INIT
) {
1397 * The remote port has the initiative, so just
1398 * keep waiting for it to complete.
1400 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1404 * The exchange is incomplete, we have seq. initiative.
1405 * Lost response with requested confirmation,
1406 * lost confirmation, lost transfer ready or
1409 * For output, if not all data was received, ask
1410 * for transfer ready to be repeated.
1412 * If we received or sent all the data, send SRR to
1415 * If we lost a response, we may have lost some read
1418 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1419 if (data_dir
== DMA_TO_DEVICE
) {
1420 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1421 if (offset
< fsp
->data_len
)
1422 r_ctl
= FC_RCTL_DD_DATA_DESC
;
1423 } else if (offset
== fsp
->xfer_contig_end
) {
1424 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1425 } else if (fsp
->xfer_contig_end
< offset
) {
1426 offset
= fsp
->xfer_contig_end
;
1428 fc_fcp_srr(fsp
, r_ctl
, offset
);
1432 fc_fcp_unlock_pkt(fsp
);
1434 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1439 * Handle error response or timeout for REC exchange.
1441 static void fc_fcp_rec_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1443 int error
= PTR_ERR(fp
);
1445 if (fc_fcp_lock_pkt(fsp
))
1450 fc_fcp_retry_cmd(fsp
);
1454 FC_DBG("REC %p fid %x error unexpected error %d\n",
1455 fsp
, fsp
->rport
->port_id
, error
);
1456 fsp
->status_code
= FC_CMD_PLOGO
;
1459 case -FC_EX_TIMEOUT
:
1461 * Assume REC or LS_ACC was lost.
1462 * The exchange manager will have aborted REC, so retry.
1464 FC_DBG("REC fid %x error error %d retry %d/%d\n",
1465 fsp
->rport
->port_id
, error
, fsp
->recov_retry
,
1466 FC_MAX_RECOV_RETRY
);
1467 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1470 fc_timeout_error(fsp
);
1473 fc_fcp_unlock_pkt(fsp
);
1475 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1479 * Time out error routine:
1480 * abort's the I/O close the exchange and
1481 * send completion notification to scsi layer
1483 static void fc_timeout_error(struct fc_fcp_pkt
*fsp
)
1485 fsp
->status_code
= FC_CMD_TIME_OUT
;
1486 fsp
->cdb_status
= 0;
1489 * if this fails then we let the scsi command timer fire and
1492 fc_fcp_send_abort(fsp
);
1496 * Sequence retransmission request.
1497 * This is called after receiving status but insufficient data, or
1498 * when expecting status but the request has timed out.
1500 static void fc_fcp_srr(struct fc_fcp_pkt
*fsp
, enum fc_rctl r_ctl
, u32 offset
)
1502 struct fc_lport
*lp
= fsp
->lp
;
1503 struct fc_rport
*rport
;
1504 struct fc_rport_libfc_priv
*rp
;
1505 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1507 struct fcp_srr
*srr
;
1508 struct fc_frame
*fp
;
1512 rp
= rport
->dd_data
;
1513 cdb_op
= fsp
->cdb_cmd
.fc_cdb
[0];
1515 if (!(rp
->flags
& FC_RP_FLAGS_RETRY
) || rp
->rp_state
!= RPORT_ST_READY
)
1516 goto retry
; /* shouldn't happen */
1517 fp
= fc_frame_alloc(lp
, sizeof(*srr
));
1521 srr
= fc_frame_payload_get(fp
, sizeof(*srr
));
1522 memset(srr
, 0, sizeof(*srr
));
1523 srr
->srr_op
= ELS_SRR
;
1524 srr
->srr_ox_id
= htons(ep
->oxid
);
1525 srr
->srr_rx_id
= htons(ep
->rxid
);
1526 srr
->srr_r_ctl
= r_ctl
;
1527 srr
->srr_rel_off
= htonl(offset
);
1529 fc_fill_fc_hdr(fp
, FC_RCTL_ELS4_REQ
, rport
->port_id
,
1530 fc_host_port_id(rp
->local_port
->host
), FC_TYPE_FCP
,
1531 FC_FC_FIRST_SEQ
| FC_FC_END_SEQ
| FC_FC_SEQ_INIT
, 0);
1533 seq
= lp
->tt
.exch_seq_send(lp
, fp
, fc_fcp_srr_resp
, NULL
,
1534 fsp
, jiffies_to_msecs(FC_SCSI_REC_TOV
));
1539 fsp
->recov_seq
= seq
;
1540 fsp
->xfer_len
= offset
;
1541 fsp
->xfer_contig_end
= offset
;
1542 fsp
->state
&= ~FC_SRB_RCV_STATUS
;
1543 fc_fcp_pkt_hold(fsp
); /* hold for outstanding SRR */
1546 fc_fcp_retry_cmd(fsp
);
1550 * Handle response from SRR.
1552 static void fc_fcp_srr_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1554 struct fc_fcp_pkt
*fsp
= arg
;
1555 struct fc_frame_header
*fh
;
1558 fc_fcp_srr_error(fsp
, fp
);
1562 if (fc_fcp_lock_pkt(fsp
))
1565 fh
= fc_frame_header_get(fp
);
1567 * BUG? fc_fcp_srr_error calls exch_done which would release
1568 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1569 * then fc_exch_timeout would be sending an abort. The exch_done
1570 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1571 * an abort response though.
1573 if (fh
->fh_type
== FC_TYPE_BLS
) {
1574 fc_fcp_unlock_pkt(fsp
);
1578 fsp
->recov_seq
= NULL
;
1579 switch (fc_frame_payload_op(fp
)) {
1581 fsp
->recov_retry
= 0;
1582 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1586 fc_timeout_error(fsp
);
1589 fc_fcp_unlock_pkt(fsp
);
1590 fsp
->lp
->tt
.exch_done(seq
);
1593 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1596 static void fc_fcp_srr_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1598 if (fc_fcp_lock_pkt(fsp
))
1600 fsp
->lp
->tt
.exch_done(fsp
->recov_seq
);
1601 fsp
->recov_seq
= NULL
;
1602 switch (PTR_ERR(fp
)) {
1603 case -FC_EX_TIMEOUT
:
1604 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1607 fc_timeout_error(fsp
);
1609 case -FC_EX_CLOSED
: /* e.g., link failure */
1612 fc_fcp_retry_cmd(fsp
);
1615 fc_fcp_unlock_pkt(fsp
);
1617 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1620 static inline int fc_fcp_lport_queue_ready(struct fc_lport
*lp
)
1623 return (lp
->state
== LPORT_ST_READY
) && lp
->link_up
&& !lp
->qfull
;
1627 * fc_queuecommand - The queuecommand function of the scsi template
1628 * @cmd: struct scsi_cmnd to be executed
1629 * @done: Callback function to be called when cmd is completed
1631 * this is the i/o strategy routine, called by the scsi layer
1632 * this routine is called with holding the host_lock.
1634 int fc_queuecommand(struct scsi_cmnd
*sc_cmd
, void (*done
)(struct scsi_cmnd
*))
1636 struct fc_lport
*lp
;
1637 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1638 struct fc_fcp_pkt
*fsp
;
1639 struct fc_rport_libfc_priv
*rp
;
1642 struct fcoe_dev_stats
*stats
;
1644 lp
= shost_priv(sc_cmd
->device
->host
);
1646 rval
= fc_remote_port_chkready(rport
);
1648 sc_cmd
->result
= rval
;
1653 if (!*(struct fc_remote_port
**)rport
->dd_data
) {
1655 * rport is transitioning from blocked/deleted to
1658 sc_cmd
->result
= DID_IMM_RETRY
<< 16;
1663 rp
= rport
->dd_data
;
1665 if (!fc_fcp_lport_queue_ready(lp
)) {
1666 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1670 fsp
= fc_fcp_pkt_alloc(lp
, GFP_ATOMIC
);
1672 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1677 * build the libfc request pkt
1679 fsp
->cmd
= sc_cmd
; /* save the cmd */
1680 fsp
->lp
= lp
; /* save the softc ptr */
1681 fsp
->rport
= rport
; /* set the remote port ptr */
1682 sc_cmd
->scsi_done
= done
;
1685 * set up the transfer length
1687 fsp
->data_len
= scsi_bufflen(sc_cmd
);
1691 * setup the data direction
1693 stats
= lp
->dev_stats
[smp_processor_id()];
1694 if (sc_cmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
1695 fsp
->req_flags
= FC_SRB_READ
;
1696 stats
->InputRequests
++;
1697 stats
->InputMegabytes
= fsp
->data_len
;
1698 } else if (sc_cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1699 fsp
->req_flags
= FC_SRB_WRITE
;
1700 stats
->OutputRequests
++;
1701 stats
->OutputMegabytes
= fsp
->data_len
;
1704 stats
->ControlRequests
++;
1707 fsp
->tgt_flags
= rp
->flags
;
1709 init_timer(&fsp
->timer
);
1710 fsp
->timer
.data
= (unsigned long)fsp
;
1713 * send it to the lower layer
1714 * if we get -1 return then put the request in the pending
1717 rval
= fc_fcp_pkt_send(lp
, fsp
);
1719 fsp
->state
= FC_SRB_FREE
;
1720 fc_fcp_pkt_release(fsp
);
1721 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1726 EXPORT_SYMBOL(fc_queuecommand
);
1729 * fc_io_compl() - Handle responses for completed commands
1732 * Translates a error to a Linux SCSI error.
1734 * The fcp packet lock must be held when calling.
1736 static void fc_io_compl(struct fc_fcp_pkt
*fsp
)
1738 struct fc_fcp_internal
*si
;
1739 struct scsi_cmnd
*sc_cmd
;
1740 struct fc_lport
*lp
;
1741 unsigned long flags
;
1743 fsp
->state
|= FC_SRB_COMPL
;
1744 if (!(fsp
->state
& FC_SRB_FCP_PROCESSING_TMO
)) {
1745 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1746 del_timer_sync(&fsp
->timer
);
1747 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1751 si
= fc_get_scsi_internal(lp
);
1752 spin_lock_irqsave(lp
->host
->host_lock
, flags
);
1754 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
1759 * if a command timed out while we had to try and throttle IO
1760 * and it is now getting cleaned up, then we are about to
1761 * try again so clear the throttled flag incase we get more
1764 if (si
->throttled
&& fsp
->state
& FC_SRB_NOMEM
)
1770 if (!sc_cmd
->SCp
.ptr
) {
1771 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
1775 CMD_SCSI_STATUS(sc_cmd
) = fsp
->cdb_status
;
1776 switch (fsp
->status_code
) {
1778 if (fsp
->cdb_status
== 0) {
1782 sc_cmd
->result
= DID_OK
<< 16;
1783 if (fsp
->scsi_resid
)
1784 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1785 } else if (fsp
->cdb_status
== QUEUE_FULL
) {
1786 struct scsi_device
*tmp_sdev
;
1787 struct scsi_device
*sdev
= sc_cmd
->device
;
1789 shost_for_each_device(tmp_sdev
, sdev
->host
) {
1790 if (tmp_sdev
->id
!= sdev
->id
)
1793 if (tmp_sdev
->queue_depth
> 1) {
1794 scsi_track_queue_full(tmp_sdev
,
1799 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
1802 * transport level I/O was ok but scsi
1803 * has non zero status
1805 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
1809 sc_cmd
->result
= DID_ERROR
<< 16;
1811 case FC_DATA_UNDRUN
:
1812 if ((fsp
->cdb_status
== 0) && !(fsp
->req_flags
& FC_SRB_READ
)) {
1814 * scsi status is good but transport level
1817 sc_cmd
->result
= DID_OK
<< 16;
1820 * scsi got underrun, this is an error
1822 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1823 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1826 case FC_DATA_OVRRUN
:
1828 * overrun is an error
1830 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1832 case FC_CMD_ABORTED
:
1833 sc_cmd
->result
= (DID_ABORT
<< 16) | fsp
->io_status
;
1835 case FC_CMD_TIME_OUT
:
1836 sc_cmd
->result
= (DID_BUS_BUSY
<< 16) | fsp
->io_status
;
1839 sc_cmd
->result
= (DID_RESET
<< 16);
1842 sc_cmd
->result
= (DID_NO_CONNECT
<< 16);
1845 sc_cmd
->result
= (DID_ERROR
<< 16);
1849 list_del(&fsp
->list
);
1850 sc_cmd
->SCp
.ptr
= NULL
;
1851 sc_cmd
->scsi_done(sc_cmd
);
1852 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
1854 /* release ref from initial allocation in queue command */
1855 fc_fcp_pkt_release(fsp
);
1859 * fc_fcp_complete() - complete processing of a fcp packet
1862 * This function may sleep if a fsp timer is pending.
1863 * The host lock must not be held by caller.
1865 void fc_fcp_complete(struct fc_fcp_pkt
*fsp
)
1867 if (fc_fcp_lock_pkt(fsp
))
1870 fc_fcp_complete_locked(fsp
);
1871 fc_fcp_unlock_pkt(fsp
);
1873 EXPORT_SYMBOL(fc_fcp_complete
);
1876 * fc_eh_abort() - Abort a command
1877 * @sc_cmd: scsi command to abort
1879 * From scsi host template.
1880 * send ABTS to the target device and wait for the response
1881 * sc_cmd is the pointer to the command to be aborted.
1883 int fc_eh_abort(struct scsi_cmnd
*sc_cmd
)
1885 struct fc_fcp_pkt
*fsp
;
1886 struct fc_lport
*lp
;
1888 unsigned long flags
;
1890 lp
= shost_priv(sc_cmd
->device
->host
);
1891 if (lp
->state
!= LPORT_ST_READY
)
1893 else if (!lp
->link_up
)
1896 spin_lock_irqsave(lp
->host
->host_lock
, flags
);
1897 fsp
= CMD_SP(sc_cmd
);
1899 /* command completed while scsi eh was setting up */
1900 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
1903 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1904 fc_fcp_pkt_hold(fsp
);
1905 spin_unlock_irqrestore(lp
->host
->host_lock
, flags
);
1907 if (fc_fcp_lock_pkt(fsp
)) {
1908 /* completed while we were waiting for timer to be deleted */
1913 rc
= fc_fcp_pkt_abort(lp
, fsp
);
1914 fc_fcp_unlock_pkt(fsp
);
1917 fc_fcp_pkt_release(fsp
);
1920 EXPORT_SYMBOL(fc_eh_abort
);
1923 * fc_eh_device_reset() Reset a single LUN
1924 * @sc_cmd: scsi command
1926 * Set from scsi host template to send tm cmd to the target and wait for the
1929 int fc_eh_device_reset(struct scsi_cmnd
*sc_cmd
)
1931 struct fc_lport
*lp
;
1932 struct fc_fcp_pkt
*fsp
;
1933 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1935 struct fc_rport_libfc_priv
*rp
;
1938 rval
= fc_remote_port_chkready(rport
);
1942 rp
= rport
->dd_data
;
1943 lp
= shost_priv(sc_cmd
->device
->host
);
1945 if (lp
->state
!= LPORT_ST_READY
)
1948 fsp
= fc_fcp_pkt_alloc(lp
, GFP_NOIO
);
1950 FC_DBG("could not allocate scsi_pkt\n");
1951 sc_cmd
->result
= DID_NO_CONNECT
<< 16;
1956 * Build the libfc request pkt. Do not set the scsi cmnd, because
1957 * the sc passed in is not setup for execution like when sent
1958 * through the queuecommand callout.
1960 fsp
->lp
= lp
; /* save the softc ptr */
1961 fsp
->rport
= rport
; /* set the remote port ptr */
1964 * flush outstanding commands
1966 rc
= fc_lun_reset(lp
, fsp
, scmd_id(sc_cmd
), sc_cmd
->device
->lun
);
1967 fsp
->state
= FC_SRB_FREE
;
1968 fc_fcp_pkt_release(fsp
);
1973 EXPORT_SYMBOL(fc_eh_device_reset
);
1976 * fc_eh_host_reset() - The reset function will reset the ports on the host.
1977 * @sc_cmd: scsi command
1979 int fc_eh_host_reset(struct scsi_cmnd
*sc_cmd
)
1981 struct Scsi_Host
*shost
= sc_cmd
->device
->host
;
1982 struct fc_lport
*lp
= shost_priv(shost
);
1983 unsigned long wait_tmo
;
1985 lp
->tt
.lport_reset(lp
);
1986 wait_tmo
= jiffies
+ FC_HOST_RESET_TIMEOUT
;
1987 while (!fc_fcp_lport_queue_ready(lp
) && time_before(jiffies
, wait_tmo
))
1990 if (fc_fcp_lport_queue_ready(lp
)) {
1991 shost_printk(KERN_INFO
, shost
, "Host reset succeeded.\n");
1994 shost_printk(KERN_INFO
, shost
, "Host reset failed. "
1995 "lport not ready.\n");
1999 EXPORT_SYMBOL(fc_eh_host_reset
);
2002 * fc_slave_alloc() - configure queue depth
2003 * @sdev: scsi device
2005 * Configures queue depth based on host's cmd_per_len. If not set
2006 * then we use the libfc default.
2008 int fc_slave_alloc(struct scsi_device
*sdev
)
2010 struct fc_rport
*rport
= starget_to_rport(scsi_target(sdev
));
2013 if (!rport
|| fc_remote_port_chkready(rport
))
2016 if (sdev
->tagged_supported
) {
2017 if (sdev
->host
->hostt
->cmd_per_lun
)
2018 queue_depth
= sdev
->host
->hostt
->cmd_per_lun
;
2020 queue_depth
= FC_FCP_DFLT_QUEUE_DEPTH
;
2021 scsi_activate_tcq(sdev
, queue_depth
);
2025 EXPORT_SYMBOL(fc_slave_alloc
);
2027 int fc_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2029 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2030 return sdev
->queue_depth
;
2032 EXPORT_SYMBOL(fc_change_queue_depth
);
2034 int fc_change_queue_type(struct scsi_device
*sdev
, int tag_type
)
2036 if (sdev
->tagged_supported
) {
2037 scsi_set_tag_type(sdev
, tag_type
);
2039 scsi_activate_tcq(sdev
, sdev
->queue_depth
);
2041 scsi_deactivate_tcq(sdev
, sdev
->queue_depth
);
2047 EXPORT_SYMBOL(fc_change_queue_type
);
2049 void fc_fcp_destroy(struct fc_lport
*lp
)
2051 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lp
);
2053 if (!list_empty(&si
->scsi_pkt_queue
))
2054 printk(KERN_ERR
"Leaked scsi packets.\n");
2056 mempool_destroy(si
->scsi_pkt_pool
);
2058 lp
->scsi_priv
= NULL
;
2060 EXPORT_SYMBOL(fc_fcp_destroy
);
2062 int fc_fcp_init(struct fc_lport
*lp
)
2065 struct fc_fcp_internal
*si
;
2067 if (!lp
->tt
.fcp_cmd_send
)
2068 lp
->tt
.fcp_cmd_send
= fc_fcp_cmd_send
;
2070 if (!lp
->tt
.fcp_cleanup
)
2071 lp
->tt
.fcp_cleanup
= fc_fcp_cleanup
;
2073 if (!lp
->tt
.fcp_abort_io
)
2074 lp
->tt
.fcp_abort_io
= fc_fcp_abort_io
;
2076 si
= kzalloc(sizeof(struct fc_fcp_internal
), GFP_KERNEL
);
2080 INIT_LIST_HEAD(&si
->scsi_pkt_queue
);
2082 si
->scsi_pkt_pool
= mempool_create_slab_pool(2, scsi_pkt_cachep
);
2083 if (!si
->scsi_pkt_pool
) {
2093 EXPORT_SYMBOL(fc_fcp_init
);
2095 static int __init
libfc_init(void)
2099 scsi_pkt_cachep
= kmem_cache_create("libfc_fcp_pkt",
2100 sizeof(struct fc_fcp_pkt
),
2101 0, SLAB_HWCACHE_ALIGN
, NULL
);
2102 if (scsi_pkt_cachep
== NULL
) {
2103 FC_DBG("Unable to allocate SRB cache...module load failed!");
2107 rc
= fc_setup_exch_mgr();
2109 goto destroy_pkt_cache
;
2111 rc
= fc_setup_rport();
2117 fc_destroy_exch_mgr();
2119 kmem_cache_destroy(scsi_pkt_cachep
);
2123 static void __exit
libfc_exit(void)
2125 kmem_cache_destroy(scsi_pkt_cachep
);
2126 fc_destroy_exch_mgr();
2130 module_init(libfc_init
);
2131 module_exit(libfc_exit
);