2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 * Maintained at www.Open-FCoE.org
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
30 #include <linux/slab.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_device.h>
36 #include <scsi/scsi_cmnd.h>
38 #include <scsi/fc/fc_fc2.h>
40 #include <scsi/libfc.h>
41 #include <scsi/fc_encode.h>
45 struct kmem_cache
*scsi_pkt_cachep
;
47 /* SRB state definitions */
48 #define FC_SRB_FREE 0 /* cmd is free */
49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
57 #define FC_SRB_READ (1 << 1)
58 #define FC_SRB_WRITE (1 << 0)
61 * The SCp.ptr should be tested and set under the host lock. NULL indicates
62 * that the command has been retruned to the scsi layer.
64 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
65 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
66 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
67 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
68 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
71 * struct fc_fcp_internal - FCP layer internal data
72 * @scsi_pkt_pool: Memory pool to draw FCP packets from
73 * @scsi_queue_lock: Protects the scsi_pkt_queue
74 * @scsi_pkt_queue: Current FCP packets
75 * @last_can_queue_ramp_down_time: ramp down time
76 * @last_can_queue_ramp_up_time: ramp up time
77 * @max_can_queue: max can_queue size
79 struct fc_fcp_internal
{
80 mempool_t
*scsi_pkt_pool
;
81 spinlock_t scsi_queue_lock
;
82 struct list_head scsi_pkt_queue
;
83 unsigned long last_can_queue_ramp_down_time
;
84 unsigned long last_can_queue_ramp_up_time
;
88 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
92 * FC scsi I/O related functions
94 static void fc_fcp_recv_data(struct fc_fcp_pkt
*, struct fc_frame
*);
95 static void fc_fcp_recv(struct fc_seq
*, struct fc_frame
*, void *);
96 static void fc_fcp_resp(struct fc_fcp_pkt
*, struct fc_frame
*);
97 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*);
98 static void fc_tm_done(struct fc_seq
*, struct fc_frame
*, void *);
99 static void fc_fcp_error(struct fc_fcp_pkt
*, struct fc_frame
*);
100 static void fc_fcp_recovery(struct fc_fcp_pkt
*);
101 static void fc_fcp_timeout(unsigned long);
102 static void fc_fcp_rec(struct fc_fcp_pkt
*);
103 static void fc_fcp_rec_error(struct fc_fcp_pkt
*, struct fc_frame
*);
104 static void fc_fcp_rec_resp(struct fc_seq
*, struct fc_frame
*, void *);
105 static void fc_io_compl(struct fc_fcp_pkt
*);
107 static void fc_fcp_srr(struct fc_fcp_pkt
*, enum fc_rctl
, u32
);
108 static void fc_fcp_srr_resp(struct fc_seq
*, struct fc_frame
*, void *);
109 static void fc_fcp_srr_error(struct fc_fcp_pkt
*, struct fc_frame
*);
112 * command status codes
114 #define FC_COMPLETE 0
115 #define FC_CMD_ABORTED 1
116 #define FC_CMD_RESET 2
117 #define FC_CMD_PLOGO 3
119 #define FC_TRANS_ERR 5
120 #define FC_DATA_OVRRUN 6
121 #define FC_DATA_UNDRUN 7
123 #define FC_HRD_ERROR 9
124 #define FC_CMD_RECOVERY 10
127 * Error recovery timeout values.
129 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
130 #define FC_SCSI_TM_TOV (10 * HZ)
131 #define FC_SCSI_REC_TOV (2 * HZ)
132 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
133 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
135 #define FC_MAX_ERROR_CNT 5
136 #define FC_MAX_RECOV_RETRY 3
138 #define FC_FCP_DFLT_QUEUE_DEPTH 32
141 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
142 * @lport: The local port that the FCP packet is for
143 * @gfp: GFP flags for allocation
145 * Return value: fcp_pkt structure or null on allocation failure.
146 * Context: Can be called from process context, no lock is required.
148 static struct fc_fcp_pkt
*fc_fcp_pkt_alloc(struct fc_lport
*lport
, gfp_t gfp
)
150 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
151 struct fc_fcp_pkt
*fsp
;
153 fsp
= mempool_alloc(si
->scsi_pkt_pool
, gfp
);
155 memset(fsp
, 0, sizeof(*fsp
));
157 atomic_set(&fsp
->ref_cnt
, 1);
158 init_timer(&fsp
->timer
);
159 INIT_LIST_HEAD(&fsp
->list
);
160 spin_lock_init(&fsp
->scsi_pkt_lock
);
166 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
167 * @fsp: The FCP packet to be released
169 * Context: Can be called from process or interrupt context,
170 * no lock is required.
172 static void fc_fcp_pkt_release(struct fc_fcp_pkt
*fsp
)
174 if (atomic_dec_and_test(&fsp
->ref_cnt
)) {
175 struct fc_fcp_internal
*si
= fc_get_scsi_internal(fsp
->lp
);
177 mempool_free(fsp
, si
->scsi_pkt_pool
);
182 * fc_fcp_pkt_hold() - Hold a fcp_pkt
183 * @fsp: The FCP packet to be held
185 static void fc_fcp_pkt_hold(struct fc_fcp_pkt
*fsp
)
187 atomic_inc(&fsp
->ref_cnt
);
191 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
192 * @seq: The sequence that the FCP packet is on (required by destructor API)
193 * @fsp: The FCP packet to be released
195 * This routine is called by a destructor callback in the exch_seq_send()
196 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
197 * argument even though it is not used by this routine.
199 * Context: No locking required.
201 static void fc_fcp_pkt_destroy(struct fc_seq
*seq
, void *fsp
)
203 fc_fcp_pkt_release(fsp
);
207 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
208 * @fsp: The FCP packet to be locked and incremented
210 * We should only return error if we return a command to SCSI-ml before
211 * getting a response. This can happen in cases where we send a abort, but
212 * do not wait for the response and the abort and command can be passing
213 * each other on the wire/network-layer.
215 * Note: this function locks the packet and gets a reference to allow
216 * callers to call the completion function while the lock is held and
217 * not have to worry about the packets refcount.
219 * TODO: Maybe we should just have callers grab/release the lock and
220 * have a function that they call to verify the fsp and grab a ref if
223 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt
*fsp
)
225 spin_lock_bh(&fsp
->scsi_pkt_lock
);
226 if (fsp
->state
& FC_SRB_COMPL
) {
227 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
231 fc_fcp_pkt_hold(fsp
);
236 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
238 * @fsp: The FCP packet to be unlocked and decremented
240 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt
*fsp
)
242 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
243 fc_fcp_pkt_release(fsp
);
247 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
248 * @fsp: The FCP packet to start a timer for
249 * @delay: The timeout period for the timer
251 static void fc_fcp_timer_set(struct fc_fcp_pkt
*fsp
, unsigned long delay
)
253 if (!(fsp
->state
& FC_SRB_COMPL
))
254 mod_timer(&fsp
->timer
, jiffies
+ delay
);
258 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
260 * @fsp: The FCP packet to abort exchanges on
262 static int fc_fcp_send_abort(struct fc_fcp_pkt
*fsp
)
267 fsp
->state
|= FC_SRB_ABORT_PENDING
;
268 return fsp
->lp
->tt
.seq_exch_abort(fsp
->seq_ptr
, 0);
272 * fc_fcp_retry_cmd() - Retry a fcp_pkt
273 * @fsp: The FCP packet to be retried
275 * Sets the status code to be FC_ERROR and then calls
276 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
277 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
278 * The SCSI-ml will retry the command.
280 static void fc_fcp_retry_cmd(struct fc_fcp_pkt
*fsp
)
283 fsp
->lp
->tt
.exch_done(fsp
->seq_ptr
);
287 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
289 fsp
->status_code
= FC_ERROR
;
290 fc_fcp_complete_locked(fsp
);
294 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
295 * @fsp: The FCP packet that will manage the DDP frames
296 * @xid: The XID that will be used for the DDP exchange
298 void fc_fcp_ddp_setup(struct fc_fcp_pkt
*fsp
, u16 xid
)
300 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
);
417 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
418 fc_fcp_can_queue_ramp_down(lport
);
419 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
424 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
425 * @fsp: The FCP packet the data is on
426 * @fp: The data frame
428 static void fc_fcp_recv_data(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
430 struct scsi_cmnd
*sc
= fsp
->cmd
;
431 struct fc_lport
*lport
= fsp
->lp
;
432 struct fcoe_dev_stats
*stats
;
433 struct fc_frame_header
*fh
;
440 struct scatterlist
*sg
;
443 fh
= fc_frame_header_get(fp
);
444 offset
= ntohl(fh
->fh_parm_offset
);
445 start_offset
= offset
;
446 len
= fr_len(fp
) - sizeof(*fh
);
447 buf
= fc_frame_payload_get(fp
, 0);
450 * if this I/O is ddped then clear it
451 * and initiate recovery since data
452 * frames are expected to be placed
453 * directly in that case.
455 if (fsp
->xfer_ddp
!= FC_XID_UNKNOWN
) {
456 fc_fcp_ddp_done(fsp
);
459 if (offset
+ len
> fsp
->data_len
) {
460 /* this should never happen */
461 if ((fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) &&
462 fc_frame_crc_check(fp
))
464 FC_FCP_DBG(fsp
, "data received past end. len %zx offset %zx "
465 "data_len %x\n", len
, offset
, fsp
->data_len
);
468 if (offset
!= fsp
->xfer_len
)
469 fsp
->state
|= FC_SRB_DISCONTIG
;
471 sg
= scsi_sglist(sc
);
472 nents
= scsi_sg_count(sc
);
474 if (!(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)) {
475 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
476 &offset
, KM_SOFTIRQ0
, NULL
);
478 crc
= crc32(~0, (u8
*) fh
, sizeof(*fh
));
479 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
480 &offset
, KM_SOFTIRQ0
, &crc
);
481 buf
= fc_frame_payload_get(fp
, 0);
483 crc
= crc32(crc
, buf
+ len
, 4 - (len
% 4));
485 if (~crc
!= le32_to_cpu(fr_crc(fp
))) {
487 stats
= per_cpu_ptr(lport
->dev_stats
, get_cpu());
488 stats
->ErrorFrames
++;
489 /* per cpu count, not total count, but OK for limit */
490 if (stats
->InvalidCRCCount
++ < 5)
491 printk(KERN_WARNING
"libfc: CRC error on data "
492 "frame for port (%6.6x)\n",
496 * Assume the frame is total garbage.
497 * We may have copied it over the good part
499 * If so, we need to retry the entire operation.
500 * Otherwise, ignore it.
502 if (fsp
->state
& FC_SRB_DISCONTIG
)
508 if (fsp
->xfer_contig_end
== start_offset
)
509 fsp
->xfer_contig_end
+= copy_len
;
510 fsp
->xfer_len
+= copy_len
;
513 * In the very rare event that this data arrived after the response
514 * and completes the transfer, call the completion handler.
516 if (unlikely(fsp
->state
& FC_SRB_RCV_STATUS
) &&
517 fsp
->xfer_len
== fsp
->data_len
- fsp
->scsi_resid
)
518 fc_fcp_complete_locked(fsp
);
521 fc_fcp_recovery(fsp
);
525 * fc_fcp_send_data() - Send SCSI data to a target
526 * @fsp: The FCP packet the data is on
527 * @sp: The sequence the data is to be sent on
528 * @offset: The starting offset for this data request
529 * @seq_blen: The burst length for this data request
531 * Called after receiving a Transfer Ready data descriptor.
532 * If the LLD is capable of sequence offload then send down the
533 * seq_blen amount of data in single frame, otherwise send
534 * multiple frames of the maximum frame payload supported by
537 static int fc_fcp_send_data(struct fc_fcp_pkt
*fsp
, struct fc_seq
*seq
,
538 size_t offset
, size_t seq_blen
)
541 struct scsi_cmnd
*sc
;
542 struct scatterlist
*sg
;
543 struct fc_frame
*fp
= NULL
;
544 struct fc_lport
*lport
= fsp
->lp
;
550 size_t frame_offset
, fh_parm_offset
;
555 int using_sg
= lport
->sg_supp
;
558 WARN_ON(seq_blen
<= 0);
559 if (unlikely(offset
+ seq_blen
> fsp
->data_len
)) {
560 /* this should never happen */
561 FC_FCP_DBG(fsp
, "xfer-ready past end. seq_blen %zx "
562 "offset %zx\n", seq_blen
, offset
);
563 fc_fcp_send_abort(fsp
);
565 } else if (offset
!= fsp
->xfer_len
) {
566 /* Out of Order Data Request - no problem, but unexpected. */
567 FC_FCP_DBG(fsp
, "xfer-ready non-contiguous. "
568 "seq_blen %zx offset %zx\n", seq_blen
, offset
);
572 * if LLD is capable of seq_offload then set transport
573 * burst length (t_blen) to seq_blen, otherwise set t_blen
574 * to max FC frame payload previously set in fsp->max_payload.
576 t_blen
= fsp
->max_payload
;
577 if (lport
->seq_offload
) {
578 t_blen
= min(seq_blen
, (size_t)lport
->lso_max
);
579 FC_FCP_DBG(fsp
, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
580 fsp
, seq_blen
, lport
->lso_max
, t_blen
);
584 t_blen
&= ~(512 - 1); /* round down to block size */
587 remaining
= seq_blen
;
588 fh_parm_offset
= frame_offset
= offset
;
590 seq
= lport
->tt
.seq_start_next(seq
);
591 f_ctl
= FC_FC_REL_OFF
;
594 sg
= scsi_sglist(sc
);
596 while (remaining
> 0 && sg
) {
597 if (offset
>= sg
->length
) {
598 offset
-= sg
->length
;
603 tlen
= min(t_blen
, remaining
);
606 * TODO. Temporary workaround. fc_seq_send() can't
607 * handle odd lengths in non-linear skbs.
608 * This will be the final fragment only.
612 fp
= fc_frame_alloc(lport
, using_sg
? 0 : tlen
);
616 data
= fc_frame_header_get(fp
) + 1;
617 fh_parm_offset
= frame_offset
;
618 fr_max_payload(fp
) = fsp
->max_payload
;
621 off
= offset
+ sg
->offset
;
622 sg_bytes
= min(tlen
, sg
->length
- offset
);
623 sg_bytes
= min(sg_bytes
,
624 (size_t) (PAGE_SIZE
- (off
& ~PAGE_MASK
)));
625 page
= sg_page(sg
) + (off
>> PAGE_SHIFT
);
628 skb_fill_page_desc(fp_skb(fp
),
629 skb_shinfo(fp_skb(fp
))->nr_frags
,
630 page
, off
& ~PAGE_MASK
, sg_bytes
);
631 fp_skb(fp
)->data_len
+= sg_bytes
;
632 fr_len(fp
) += sg_bytes
;
633 fp_skb(fp
)->truesize
+= PAGE_SIZE
;
636 * The scatterlist item may be bigger than PAGE_SIZE,
637 * but we must not cross pages inside the kmap.
639 page_addr
= kmap_atomic(page
, KM_SOFTIRQ0
);
640 memcpy(data
, (char *)page_addr
+ (off
& ~PAGE_MASK
),
642 kunmap_atomic(page_addr
, KM_SOFTIRQ0
);
646 frame_offset
+= sg_bytes
;
648 remaining
-= sg_bytes
;
650 if ((skb_shinfo(fp_skb(fp
))->nr_frags
< FC_FRAME_SG_LEN
) &&
655 * Send sequence with transfer sequence initiative in case
656 * this is last FCP frame of the sequence.
659 f_ctl
|= FC_FC_SEQ_INIT
| FC_FC_END_SEQ
;
661 ep
= fc_seq_exch(seq
);
662 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
663 FC_TYPE_FCP
, f_ctl
, fh_parm_offset
);
666 * send fragment using for a sequence.
668 error
= lport
->tt
.seq_send(lport
, seq
, fp
);
670 WARN_ON(1); /* send error should be rare */
671 fc_fcp_retry_cmd(fsp
);
676 fsp
->xfer_len
+= seq_blen
; /* premature count? */
681 * fc_fcp_abts_resp() - Send an ABTS response
682 * @fsp: The FCP packet that is being aborted
683 * @fp: The response frame
685 static void fc_fcp_abts_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
688 struct fc_ba_rjt
*brp
;
689 struct fc_frame_header
*fh
;
691 fh
= fc_frame_header_get(fp
);
692 switch (fh
->fh_r_ctl
) {
696 brp
= fc_frame_payload_get(fp
, sizeof(*brp
));
697 if (brp
&& brp
->br_reason
== FC_BA_RJT_LOG_ERR
)
702 * we will let the command timeout
703 * and scsi-ml recover in this case,
704 * therefore cleared the ba_done flag.
710 fsp
->state
|= FC_SRB_ABORTED
;
711 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
713 if (fsp
->wait_for_comp
)
714 complete(&fsp
->tm_done
);
716 fc_fcp_complete_locked(fsp
);
721 * fc_fcp_recv() - Reveive an FCP frame
722 * @seq: The sequence the frame is on
723 * @fp: The received frame
724 * @arg: The related FCP packet
726 * Context: Called from Soft IRQ context. Can not be called
727 * holding the FCP packet list lock.
729 static void fc_fcp_recv(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
731 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
732 struct fc_lport
*lport
= fsp
->lp
;
733 struct fc_frame_header
*fh
;
734 struct fcp_txrdy
*dd
;
739 fc_fcp_error(fsp
, fp
);
743 fh
= fc_frame_header_get(fp
);
744 r_ctl
= fh
->fh_r_ctl
;
746 if (lport
->state
!= LPORT_ST_READY
)
748 if (fc_fcp_lock_pkt(fsp
))
750 fsp
->last_pkt_time
= jiffies
;
752 if (fh
->fh_type
== FC_TYPE_BLS
) {
753 fc_fcp_abts_resp(fsp
, fp
);
757 if (fsp
->state
& (FC_SRB_ABORTED
| FC_SRB_ABORT_PENDING
))
760 if (r_ctl
== FC_RCTL_DD_DATA_DESC
) {
762 * received XFER RDY from the target
763 * need to send data to the target
765 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
766 dd
= fc_frame_payload_get(fp
, sizeof(*dd
));
769 rc
= fc_fcp_send_data(fsp
, seq
,
770 (size_t) ntohl(dd
->ft_data_ro
),
771 (size_t) ntohl(dd
->ft_burst_len
));
773 seq
->rec_data
= fsp
->xfer_len
;
774 } else if (r_ctl
== FC_RCTL_DD_SOL_DATA
) {
776 * received a DATA frame
777 * next we will copy the data to the system buffer
779 WARN_ON(fr_len(fp
) < sizeof(*fh
)); /* len may be 0 */
780 fc_fcp_recv_data(fsp
, fp
);
781 seq
->rec_data
= fsp
->xfer_contig_end
;
782 } else if (r_ctl
== FC_RCTL_DD_CMD_STATUS
) {
783 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
785 fc_fcp_resp(fsp
, fp
);
787 FC_FCP_DBG(fsp
, "unexpected frame. r_ctl %x\n", r_ctl
);
790 fc_fcp_unlock_pkt(fsp
);
796 * fc_fcp_resp() - Handler for FCP responses
797 * @fsp: The FCP packet the response is for
798 * @fp: The response frame
800 static void fc_fcp_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
802 struct fc_frame_header
*fh
;
803 struct fcp_resp
*fc_rp
;
804 struct fcp_resp_ext
*rp_ex
;
805 struct fcp_resp_rsp_info
*fc_rp_info
;
813 fh
= (struct fc_frame_header
*)fr_hdr(fp
);
814 if (unlikely(plen
< sizeof(*fh
) + sizeof(*fc_rp
)))
817 fc_rp
= (struct fcp_resp
*)(fh
+ 1);
818 fsp
->cdb_status
= fc_rp
->fr_status
;
819 flags
= fc_rp
->fr_flags
;
820 fsp
->scsi_comp_flags
= flags
;
821 expected_len
= fsp
->data_len
;
823 /* if ddp, update xfer len */
824 fc_fcp_ddp_done(fsp
);
826 if (unlikely((flags
& ~FCP_CONF_REQ
) || fc_rp
->fr_status
)) {
827 rp_ex
= (void *)(fc_rp
+ 1);
828 if (flags
& (FCP_RSP_LEN_VAL
| FCP_SNS_LEN_VAL
)) {
829 if (plen
< sizeof(*fc_rp
) + sizeof(*rp_ex
))
831 fc_rp_info
= (struct fcp_resp_rsp_info
*)(rp_ex
+ 1);
832 if (flags
& FCP_RSP_LEN_VAL
) {
833 respl
= ntohl(rp_ex
->fr_rsp_len
);
834 if (respl
!= sizeof(*fc_rp_info
))
836 if (fsp
->wait_for_comp
) {
837 /* Abuse cdb_status for rsp code */
838 fsp
->cdb_status
= fc_rp_info
->rsp_code
;
839 complete(&fsp
->tm_done
);
841 * tmfs will not have any scsi cmd so
847 if (flags
& FCP_SNS_LEN_VAL
) {
848 snsl
= ntohl(rp_ex
->fr_sns_len
);
849 if (snsl
> SCSI_SENSE_BUFFERSIZE
)
850 snsl
= SCSI_SENSE_BUFFERSIZE
;
851 memcpy(fsp
->cmd
->sense_buffer
,
852 (char *)fc_rp_info
+ respl
, snsl
);
855 if (flags
& (FCP_RESID_UNDER
| FCP_RESID_OVER
)) {
856 if (plen
< sizeof(*fc_rp
) + sizeof(rp_ex
->fr_resid
))
858 if (flags
& FCP_RESID_UNDER
) {
859 fsp
->scsi_resid
= ntohl(rp_ex
->fr_resid
);
861 * The cmnd->underflow is the minimum number of
862 * bytes that must be transfered for this
863 * command. Provided a sense condition is not
864 * present, make sure the actual amount
865 * transferred is at least the underflow value
868 if (!(flags
& FCP_SNS_LEN_VAL
) &&
869 (fc_rp
->fr_status
== 0) &&
870 (scsi_bufflen(fsp
->cmd
) -
871 fsp
->scsi_resid
) < fsp
->cmd
->underflow
)
873 expected_len
-= fsp
->scsi_resid
;
875 fsp
->status_code
= FC_ERROR
;
879 fsp
->state
|= FC_SRB_RCV_STATUS
;
882 * Check for missing or extra data frames.
884 if (unlikely(fsp
->xfer_len
!= expected_len
)) {
885 if (fsp
->xfer_len
< expected_len
) {
887 * Some data may be queued locally,
888 * Wait a at least one jiffy to see if it is delivered.
889 * If this expires without data, we may do SRR.
891 fc_fcp_timer_set(fsp
, 2);
894 fsp
->status_code
= FC_DATA_OVRRUN
;
895 FC_FCP_DBG(fsp
, "tgt %6.6x xfer len %zx greater than expected, "
896 "len %x, data len %x\n",
898 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
900 fc_fcp_complete_locked(fsp
);
904 FC_FCP_DBG(fsp
, "short FCP response. flags 0x%x len %u respl %u "
905 "snsl %u\n", flags
, fr_len(fp
), respl
, snsl
);
907 fsp
->status_code
= FC_ERROR
;
908 fc_fcp_complete_locked(fsp
);
912 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
914 * @fsp: The FCP packet to be completed
916 * This function may sleep if a timer is pending. The packet lock must be
917 * held, and the host lock must not be held.
919 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*fsp
)
921 struct fc_lport
*lport
= fsp
->lp
;
926 if (fsp
->state
& FC_SRB_ABORT_PENDING
)
929 if (fsp
->state
& FC_SRB_ABORTED
) {
930 if (!fsp
->status_code
)
931 fsp
->status_code
= FC_CMD_ABORTED
;
934 * Test for transport underrun, independent of response
937 if (fsp
->xfer_len
< fsp
->data_len
&& !fsp
->io_status
&&
938 (!(fsp
->scsi_comp_flags
& FCP_RESID_UNDER
) ||
939 fsp
->xfer_len
< fsp
->data_len
- fsp
->scsi_resid
)) {
940 fsp
->status_code
= FC_DATA_UNDRUN
;
948 if (unlikely(fsp
->scsi_comp_flags
& FCP_CONF_REQ
)) {
949 struct fc_frame
*conf_frame
;
952 csp
= lport
->tt
.seq_start_next(seq
);
953 conf_frame
= fc_fcp_frame_alloc(fsp
->lp
, 0);
955 f_ctl
= FC_FC_SEQ_INIT
;
956 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
957 ep
= fc_seq_exch(seq
);
958 fc_fill_fc_hdr(conf_frame
, FC_RCTL_DD_SOL_CTL
,
960 FC_TYPE_FCP
, f_ctl
, 0);
961 lport
->tt
.seq_send(lport
, csp
, conf_frame
);
964 lport
->tt
.exch_done(seq
);
970 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
971 * @fsp: The FCP packet whose exchanges should be canceled
972 * @error: The reason for the cancellation
974 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt
*fsp
, int error
)
976 struct fc_lport
*lport
= fsp
->lp
;
979 lport
->tt
.exch_done(fsp
->seq_ptr
);
982 fsp
->status_code
= error
;
986 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
987 * @lport: The local port whose exchanges should be canceled
988 * @id: The target's ID
990 * @error: The reason for cancellation
992 * If lun or id is -1, they are ignored.
994 static void fc_fcp_cleanup_each_cmd(struct fc_lport
*lport
, unsigned int id
,
995 unsigned int lun
, int error
)
997 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
998 struct fc_fcp_pkt
*fsp
;
999 struct scsi_cmnd
*sc_cmd
;
1000 unsigned long flags
;
1002 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1004 list_for_each_entry(fsp
, &si
->scsi_pkt_queue
, list
) {
1006 if (id
!= -1 && scmd_id(sc_cmd
) != id
)
1009 if (lun
!= -1 && sc_cmd
->device
->lun
!= lun
)
1012 fc_fcp_pkt_hold(fsp
);
1013 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1015 if (!fc_fcp_lock_pkt(fsp
)) {
1016 fc_fcp_cleanup_cmd(fsp
, error
);
1018 fc_fcp_unlock_pkt(fsp
);
1021 fc_fcp_pkt_release(fsp
);
1022 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1024 * while we dropped the lock multiple pkts could
1025 * have been released, so we have to start over.
1029 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1033 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1034 * @lport: The local port whose exchanges are to be aborted
1036 static void fc_fcp_abort_io(struct fc_lport
*lport
)
1038 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_HRD_ERROR
);
1042 * fc_fcp_pkt_send() - Send a fcp_pkt
1043 * @lport: The local port to send the FCP packet on
1044 * @fsp: The FCP packet to send
1046 * Return: Zero for success and -1 for failure
1047 * Locks: Called without locks held
1049 static int fc_fcp_pkt_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
)
1051 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1052 unsigned long flags
;
1055 fsp
->cmd
->SCp
.ptr
= (char *)fsp
;
1056 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1057 fsp
->cdb_cmd
.fc_flags
= fsp
->req_flags
& ~FCP_CFL_LEN_MASK
;
1059 int_to_scsilun(fsp
->cmd
->device
->lun
,
1060 (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1061 memcpy(fsp
->cdb_cmd
.fc_cdb
, fsp
->cmd
->cmnd
, fsp
->cmd
->cmd_len
);
1063 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1064 list_add_tail(&fsp
->list
, &si
->scsi_pkt_queue
);
1065 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1066 rc
= lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_fcp_recv
);
1068 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1069 list_del(&fsp
->list
);
1070 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1077 * fc_fcp_cmd_send() - Send a FCP command
1078 * @lport: The local port to send the command on
1079 * @fsp: The FCP packet the command is on
1080 * @resp: The handler for the response
1082 static int fc_fcp_cmd_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1083 void (*resp
)(struct fc_seq
*,
1084 struct fc_frame
*fp
,
1087 struct fc_frame
*fp
;
1089 struct fc_rport
*rport
;
1090 struct fc_rport_libfc_priv
*rpriv
;
1091 const size_t len
= sizeof(fsp
->cdb_cmd
);
1094 if (fc_fcp_lock_pkt(fsp
))
1097 fp
= fc_fcp_frame_alloc(lport
, sizeof(fsp
->cdb_cmd
));
1103 memcpy(fc_frame_payload_get(fp
, len
), &fsp
->cdb_cmd
, len
);
1106 fsp
->max_payload
= rport
->maxframe_size
;
1107 rpriv
= rport
->dd_data
;
1109 fc_fill_fc_hdr(fp
, FC_RCTL_DD_UNSOL_CMD
, rport
->port_id
,
1110 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1113 seq
= lport
->tt
.exch_seq_send(lport
, fp
, resp
, fc_fcp_pkt_destroy
,
1119 fsp
->last_pkt_time
= jiffies
;
1121 fc_fcp_pkt_hold(fsp
); /* hold for fc_fcp_pkt_destroy */
1123 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1124 fc_fcp_timer_set(fsp
,
1125 (fsp
->tgt_flags
& FC_RP_FLAGS_REC_SUPPORTED
) ?
1126 FC_SCSI_REC_TOV
: FC_SCSI_ER_TIMEOUT
);
1128 fc_fcp_unlock_pkt(fsp
);
1133 * fc_fcp_error() - Handler for FCP layer errors
1134 * @fsp: The FCP packet the error is on
1135 * @fp: The frame that has errored
1137 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1139 int error
= PTR_ERR(fp
);
1141 if (fc_fcp_lock_pkt(fsp
))
1144 if (error
== -FC_EX_CLOSED
) {
1145 fc_fcp_retry_cmd(fsp
);
1150 * clear abort pending, because the lower layer
1151 * decided to force completion.
1153 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
1154 fsp
->status_code
= FC_CMD_PLOGO
;
1155 fc_fcp_complete_locked(fsp
);
1157 fc_fcp_unlock_pkt(fsp
);
1161 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1162 * @fsp: The FCP packet to abort on
1164 * Called to send an abort and then wait for abort completion
1166 static int fc_fcp_pkt_abort(struct fc_fcp_pkt
*fsp
)
1170 if (fc_fcp_send_abort(fsp
))
1173 init_completion(&fsp
->tm_done
);
1174 fsp
->wait_for_comp
= 1;
1176 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1177 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1178 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1179 fsp
->wait_for_comp
= 0;
1182 FC_FCP_DBG(fsp
, "target abort cmd failed\n");
1184 } else if (fsp
->state
& FC_SRB_ABORTED
) {
1185 FC_FCP_DBG(fsp
, "target abort cmd passed\n");
1187 fc_fcp_complete_locked(fsp
);
1194 * fc_lun_reset_send() - Send LUN reset command
1195 * @data: The FCP packet that identifies the LUN to be reset
1197 static void fc_lun_reset_send(unsigned long data
)
1199 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1200 struct fc_lport
*lport
= fsp
->lp
;
1201 if (lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_tm_done
)) {
1202 if (fsp
->recov_retry
++ >= FC_MAX_RECOV_RETRY
)
1204 if (fc_fcp_lock_pkt(fsp
))
1206 setup_timer(&fsp
->timer
, fc_lun_reset_send
, (unsigned long)fsp
);
1207 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1208 fc_fcp_unlock_pkt(fsp
);
1213 * fc_lun_reset() - Send a LUN RESET command to a device
1214 * and wait for the reply
1215 * @lport: The local port to sent the command on
1216 * @fsp: The FCP packet that identifies the LUN to be reset
1217 * @id: The SCSI command ID
1218 * @lun: The LUN ID to be reset
1220 static int fc_lun_reset(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1221 unsigned int id
, unsigned int lun
)
1225 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1226 fsp
->cdb_cmd
.fc_tm_flags
= FCP_TMF_LUN_RESET
;
1227 int_to_scsilun(lun
, (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1229 fsp
->wait_for_comp
= 1;
1230 init_completion(&fsp
->tm_done
);
1232 fc_lun_reset_send((unsigned long)fsp
);
1235 * wait for completion of reset
1236 * after that make sure all commands are terminated
1238 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1240 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1241 fsp
->state
|= FC_SRB_COMPL
;
1242 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1244 del_timer_sync(&fsp
->timer
);
1246 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1248 lport
->tt
.exch_done(fsp
->seq_ptr
);
1249 fsp
->seq_ptr
= NULL
;
1251 fsp
->wait_for_comp
= 0;
1252 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1255 FC_SCSI_DBG(lport
, "lun reset failed\n");
1259 /* cdb_status holds the tmf's rsp code */
1260 if (fsp
->cdb_status
!= FCP_TMF_CMPL
)
1263 FC_SCSI_DBG(lport
, "lun reset to lun %u completed\n", lun
);
1264 fc_fcp_cleanup_each_cmd(lport
, id
, lun
, FC_CMD_ABORTED
);
1269 * fc_tm_done() - Task Managment response handler
1270 * @seq: The sequence that the response is on
1271 * @fp: The response frame
1272 * @arg: The FCP packet the response is for
1274 static void fc_tm_done(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1276 struct fc_fcp_pkt
*fsp
= arg
;
1277 struct fc_frame_header
*fh
;
1281 * If there is an error just let it timeout or wait
1282 * for TMF to be aborted if it timedout.
1284 * scsi-eh will escalate for when either happens.
1289 if (fc_fcp_lock_pkt(fsp
))
1293 * raced with eh timeout handler.
1295 if (!fsp
->seq_ptr
|| !fsp
->wait_for_comp
) {
1296 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1300 fh
= fc_frame_header_get(fp
);
1301 if (fh
->fh_type
!= FC_TYPE_BLS
)
1302 fc_fcp_resp(fsp
, fp
);
1303 fsp
->seq_ptr
= NULL
;
1304 fsp
->lp
->tt
.exch_done(seq
);
1306 fc_fcp_unlock_pkt(fsp
);
1310 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1311 * @lport: The local port to be cleaned up
1313 static void fc_fcp_cleanup(struct fc_lport
*lport
)
1315 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_ERROR
);
1319 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1320 * @data: The FCP packet that has timed out
1322 * If REC is supported then just issue it and return. The REC exchange will
1323 * complete or time out and recovery can continue at that point. Otherwise,
1324 * if the response has been received without all the data it has been
1325 * ER_TIMEOUT since the response was received. If the response has not been
1326 * received we see if data was received recently. If it has been then we
1327 * continue waiting, otherwise, we abort the command.
1329 static void fc_fcp_timeout(unsigned long data
)
1331 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1332 struct fc_rport
*rport
= fsp
->rport
;
1333 struct fc_rport_libfc_priv
*rpriv
= rport
->dd_data
;
1335 if (fc_fcp_lock_pkt(fsp
))
1338 if (fsp
->cdb_cmd
.fc_tm_flags
)
1341 fsp
->state
|= FC_SRB_FCP_PROCESSING_TMO
;
1343 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1345 else if (time_after_eq(fsp
->last_pkt_time
+ (FC_SCSI_ER_TIMEOUT
/ 2),
1347 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1348 else if (fsp
->state
& FC_SRB_RCV_STATUS
)
1349 fc_fcp_complete_locked(fsp
);
1351 fc_fcp_recovery(fsp
);
1352 fsp
->state
&= ~FC_SRB_FCP_PROCESSING_TMO
;
1354 fc_fcp_unlock_pkt(fsp
);
1358 * fc_fcp_rec() - Send a REC ELS request
1359 * @fsp: The FCP packet to send the REC request on
1361 static void fc_fcp_rec(struct fc_fcp_pkt
*fsp
)
1363 struct fc_lport
*lport
;
1364 struct fc_frame
*fp
;
1365 struct fc_rport
*rport
;
1366 struct fc_rport_libfc_priv
*rpriv
;
1370 rpriv
= rport
->dd_data
;
1371 if (!fsp
->seq_ptr
|| rpriv
->rp_state
!= RPORT_ST_READY
) {
1372 fsp
->status_code
= FC_HRD_ERROR
;
1374 fc_fcp_complete_locked(fsp
);
1377 fp
= fc_fcp_frame_alloc(lport
, sizeof(struct fc_els_rec
));
1381 fr_seq(fp
) = fsp
->seq_ptr
;
1382 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, rport
->port_id
,
1383 rpriv
->local_port
->port_id
, FC_TYPE_ELS
,
1385 if (lport
->tt
.elsct_send(lport
, rport
->port_id
, fp
, ELS_REC
,
1386 fc_fcp_rec_resp
, fsp
,
1387 jiffies_to_msecs(FC_SCSI_REC_TOV
))) {
1388 fc_fcp_pkt_hold(fsp
); /* hold while REC outstanding */
1392 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1393 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1395 fc_fcp_recovery(fsp
);
1399 * fc_fcp_rec_resp() - Handler for REC ELS responses
1400 * @seq: The sequence the response is on
1401 * @fp: The response frame
1402 * @arg: The FCP packet the response is on
1404 * If the response is a reject then the scsi layer will handle
1405 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1406 * set the timeout and return. If the I/O was completed then complete the
1407 * exchange and tell the SCSI layer.
1409 static void fc_fcp_rec_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1411 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
1412 struct fc_els_rec_acc
*recp
;
1413 struct fc_els_ls_rjt
*rjt
;
1417 enum dma_data_direction data_dir
;
1419 struct fc_rport_libfc_priv
*rpriv
;
1422 fc_fcp_rec_error(fsp
, fp
);
1426 if (fc_fcp_lock_pkt(fsp
))
1429 fsp
->recov_retry
= 0;
1430 opcode
= fc_frame_payload_op(fp
);
1431 if (opcode
== ELS_LS_RJT
) {
1432 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1433 switch (rjt
->er_reason
) {
1435 FC_FCP_DBG(fsp
, "device %x unexpected REC reject "
1436 "reason %d expl %d\n",
1437 fsp
->rport
->port_id
, rjt
->er_reason
,
1441 FC_FCP_DBG(fsp
, "device does not support REC\n");
1442 rpriv
= fsp
->rport
->dd_data
;
1444 * if we do not spport RECs or got some bogus
1445 * reason then resetup timer so we check for
1448 rpriv
->flags
&= ~FC_RP_FLAGS_REC_SUPPORTED
;
1449 fc_fcp_timer_set(fsp
, FC_SCSI_ER_TIMEOUT
);
1454 * If no data transfer, the command frame got dropped
1455 * so we just retry. If data was transferred, we
1456 * lost the response but the target has no record,
1457 * so we abort and retry.
1459 if (rjt
->er_explan
== ELS_EXPL_OXID_RXID
&&
1460 fsp
->xfer_len
== 0) {
1461 fc_fcp_retry_cmd(fsp
);
1464 fc_fcp_recovery(fsp
);
1467 } else if (opcode
== ELS_LS_ACC
) {
1468 if (fsp
->state
& FC_SRB_ABORTED
)
1471 data_dir
= fsp
->cmd
->sc_data_direction
;
1472 recp
= fc_frame_payload_get(fp
, sizeof(*recp
));
1473 offset
= ntohl(recp
->reca_fc4value
);
1474 e_stat
= ntohl(recp
->reca_e_stat
);
1476 if (e_stat
& ESB_ST_COMPLETE
) {
1479 * The exchange is complete.
1481 * For output, we must've lost the response.
1482 * For input, all data must've been sent.
1483 * We lost may have lost the response
1484 * (and a confirmation was requested) and maybe
1487 * If all data received, send SRR
1488 * asking for response. If partial data received,
1489 * or gaps, SRR requests data at start of gap.
1490 * Recovery via SRR relies on in-order-delivery.
1492 if (data_dir
== DMA_TO_DEVICE
) {
1493 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1494 } else if (fsp
->xfer_contig_end
== offset
) {
1495 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1497 offset
= fsp
->xfer_contig_end
;
1498 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1500 fc_fcp_srr(fsp
, r_ctl
, offset
);
1501 } else if (e_stat
& ESB_ST_SEQ_INIT
) {
1504 * The remote port has the initiative, so just
1505 * keep waiting for it to complete.
1507 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1511 * The exchange is incomplete, we have seq. initiative.
1512 * Lost response with requested confirmation,
1513 * lost confirmation, lost transfer ready or
1516 * For output, if not all data was received, ask
1517 * for transfer ready to be repeated.
1519 * If we received or sent all the data, send SRR to
1522 * If we lost a response, we may have lost some read
1525 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1526 if (data_dir
== DMA_TO_DEVICE
) {
1527 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1528 if (offset
< fsp
->data_len
)
1529 r_ctl
= FC_RCTL_DD_DATA_DESC
;
1530 } else if (offset
== fsp
->xfer_contig_end
) {
1531 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1532 } else if (fsp
->xfer_contig_end
< offset
) {
1533 offset
= fsp
->xfer_contig_end
;
1535 fc_fcp_srr(fsp
, r_ctl
, offset
);
1539 fc_fcp_unlock_pkt(fsp
);
1541 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1546 * fc_fcp_rec_error() - Handler for REC errors
1547 * @fsp: The FCP packet the error is on
1548 * @fp: The REC frame
1550 static void fc_fcp_rec_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1552 int error
= PTR_ERR(fp
);
1554 if (fc_fcp_lock_pkt(fsp
))
1559 fc_fcp_retry_cmd(fsp
);
1563 FC_FCP_DBG(fsp
, "REC %p fid %6.6x error unexpected error %d\n",
1564 fsp
, fsp
->rport
->port_id
, error
);
1565 fsp
->status_code
= FC_CMD_PLOGO
;
1568 case -FC_EX_TIMEOUT
:
1570 * Assume REC or LS_ACC was lost.
1571 * The exchange manager will have aborted REC, so retry.
1573 FC_FCP_DBG(fsp
, "REC fid %6.6x error error %d retry %d/%d\n",
1574 fsp
->rport
->port_id
, error
, fsp
->recov_retry
,
1575 FC_MAX_RECOV_RETRY
);
1576 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1579 fc_fcp_recovery(fsp
);
1582 fc_fcp_unlock_pkt(fsp
);
1584 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1588 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1589 * @fsp: The FCP pkt that needs to be aborted
1591 static void fc_fcp_recovery(struct fc_fcp_pkt
*fsp
)
1593 fsp
->status_code
= FC_CMD_RECOVERY
;
1594 fsp
->cdb_status
= 0;
1597 * if this fails then we let the scsi command timer fire and
1600 fc_fcp_send_abort(fsp
);
1604 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1605 * @fsp: The FCP packet the SRR is to be sent on
1606 * @r_ctl: The R_CTL field for the SRR request
1607 * This is called after receiving status but insufficient data, or
1608 * when expecting status but the request has timed out.
1610 static void fc_fcp_srr(struct fc_fcp_pkt
*fsp
, enum fc_rctl r_ctl
, u32 offset
)
1612 struct fc_lport
*lport
= fsp
->lp
;
1613 struct fc_rport
*rport
;
1614 struct fc_rport_libfc_priv
*rpriv
;
1615 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1617 struct fcp_srr
*srr
;
1618 struct fc_frame
*fp
;
1622 rpriv
= rport
->dd_data
;
1623 cdb_op
= fsp
->cdb_cmd
.fc_cdb
[0];
1625 if (!(rpriv
->flags
& FC_RP_FLAGS_RETRY
) ||
1626 rpriv
->rp_state
!= RPORT_ST_READY
)
1627 goto retry
; /* shouldn't happen */
1628 fp
= fc_fcp_frame_alloc(lport
, sizeof(*srr
));
1632 srr
= fc_frame_payload_get(fp
, sizeof(*srr
));
1633 memset(srr
, 0, sizeof(*srr
));
1634 srr
->srr_op
= ELS_SRR
;
1635 srr
->srr_ox_id
= htons(ep
->oxid
);
1636 srr
->srr_rx_id
= htons(ep
->rxid
);
1637 srr
->srr_r_ctl
= r_ctl
;
1638 srr
->srr_rel_off
= htonl(offset
);
1640 fc_fill_fc_hdr(fp
, FC_RCTL_ELS4_REQ
, rport
->port_id
,
1641 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1644 seq
= lport
->tt
.exch_seq_send(lport
, fp
, fc_fcp_srr_resp
, NULL
,
1645 fsp
, jiffies_to_msecs(FC_SCSI_REC_TOV
));
1649 fsp
->recov_seq
= seq
;
1650 fsp
->xfer_len
= offset
;
1651 fsp
->xfer_contig_end
= offset
;
1652 fsp
->state
&= ~FC_SRB_RCV_STATUS
;
1653 fc_fcp_pkt_hold(fsp
); /* hold for outstanding SRR */
1656 fc_fcp_retry_cmd(fsp
);
1660 * fc_fcp_srr_resp() - Handler for SRR response
1661 * @seq: The sequence the SRR is on
1662 * @fp: The SRR frame
1663 * @arg: The FCP packet the SRR is on
1665 static void fc_fcp_srr_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1667 struct fc_fcp_pkt
*fsp
= arg
;
1668 struct fc_frame_header
*fh
;
1671 fc_fcp_srr_error(fsp
, fp
);
1675 if (fc_fcp_lock_pkt(fsp
))
1678 fh
= fc_frame_header_get(fp
);
1680 * BUG? fc_fcp_srr_error calls exch_done which would release
1681 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1682 * then fc_exch_timeout would be sending an abort. The exch_done
1683 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1684 * an abort response though.
1686 if (fh
->fh_type
== FC_TYPE_BLS
) {
1687 fc_fcp_unlock_pkt(fsp
);
1691 fsp
->recov_seq
= NULL
;
1692 switch (fc_frame_payload_op(fp
)) {
1694 fsp
->recov_retry
= 0;
1695 fc_fcp_timer_set(fsp
, FC_SCSI_REC_TOV
);
1699 fc_fcp_recovery(fsp
);
1702 fc_fcp_unlock_pkt(fsp
);
1703 fsp
->lp
->tt
.exch_done(seq
);
1706 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1710 * fc_fcp_srr_error() - Handler for SRR errors
1711 * @fsp: The FCP packet that the SRR error is on
1712 * @fp: The SRR frame
1714 static void fc_fcp_srr_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1716 if (fc_fcp_lock_pkt(fsp
))
1718 fsp
->lp
->tt
.exch_done(fsp
->recov_seq
);
1719 fsp
->recov_seq
= NULL
;
1720 switch (PTR_ERR(fp
)) {
1721 case -FC_EX_TIMEOUT
:
1722 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1725 fc_fcp_recovery(fsp
);
1727 case -FC_EX_CLOSED
: /* e.g., link failure */
1730 fc_fcp_retry_cmd(fsp
);
1733 fc_fcp_unlock_pkt(fsp
);
1735 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding SRR */
1739 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1740 * @lport: The local port to be checked
1742 static inline int fc_fcp_lport_queue_ready(struct fc_lport
*lport
)
1745 return (lport
->state
== LPORT_ST_READY
) &&
1746 lport
->link_up
&& !lport
->qfull
;
1750 * fc_queuecommand() - The queuecommand function of the SCSI template
1751 * @cmd: The scsi_cmnd to be executed
1752 * @done: The callback function to be called when the scsi_cmnd is complete
1754 * This is the i/o strategy routine, called by the SCSI layer. This routine
1755 * is called with the host_lock held.
1757 int fc_queuecommand(struct scsi_cmnd
*sc_cmd
, void (*done
)(struct scsi_cmnd
*))
1759 struct fc_lport
*lport
;
1760 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1761 struct fc_fcp_pkt
*fsp
;
1762 struct fc_rport_libfc_priv
*rpriv
;
1765 struct fcoe_dev_stats
*stats
;
1767 lport
= shost_priv(sc_cmd
->device
->host
);
1769 rval
= fc_remote_port_chkready(rport
);
1771 sc_cmd
->result
= rval
;
1775 spin_unlock_irq(lport
->host
->host_lock
);
1777 if (!*(struct fc_remote_port
**)rport
->dd_data
) {
1779 * rport is transitioning from blocked/deleted to
1782 sc_cmd
->result
= DID_IMM_RETRY
<< 16;
1787 rpriv
= rport
->dd_data
;
1789 if (!fc_fcp_lport_queue_ready(lport
)) {
1791 fc_fcp_can_queue_ramp_down(lport
);
1792 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1796 fsp
= fc_fcp_pkt_alloc(lport
, GFP_ATOMIC
);
1798 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1803 * build the libfc request pkt
1805 fsp
->cmd
= sc_cmd
; /* save the cmd */
1806 fsp
->lp
= lport
; /* save the softc ptr */
1807 fsp
->rport
= rport
; /* set the remote port ptr */
1808 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
1809 sc_cmd
->scsi_done
= done
;
1812 * set up the transfer length
1814 fsp
->data_len
= scsi_bufflen(sc_cmd
);
1818 * setup the data direction
1820 stats
= per_cpu_ptr(lport
->dev_stats
, get_cpu());
1821 if (sc_cmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
1822 fsp
->req_flags
= FC_SRB_READ
;
1823 stats
->InputRequests
++;
1824 stats
->InputMegabytes
= fsp
->data_len
;
1825 } else if (sc_cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1826 fsp
->req_flags
= FC_SRB_WRITE
;
1827 stats
->OutputRequests
++;
1828 stats
->OutputMegabytes
= fsp
->data_len
;
1831 stats
->ControlRequests
++;
1835 fsp
->tgt_flags
= rpriv
->flags
;
1837 init_timer(&fsp
->timer
);
1838 fsp
->timer
.data
= (unsigned long)fsp
;
1841 * send it to the lower layer
1842 * if we get -1 return then put the request in the pending
1845 rval
= fc_fcp_pkt_send(lport
, fsp
);
1847 fsp
->state
= FC_SRB_FREE
;
1848 fc_fcp_pkt_release(fsp
);
1849 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1852 spin_lock_irq(lport
->host
->host_lock
);
1855 EXPORT_SYMBOL(fc_queuecommand
);
1858 * fc_io_compl() - Handle responses for completed commands
1859 * @fsp: The FCP packet that is complete
1861 * Translates fcp_pkt errors to a Linux SCSI errors.
1862 * The fcp packet lock must be held when calling.
1864 static void fc_io_compl(struct fc_fcp_pkt
*fsp
)
1866 struct fc_fcp_internal
*si
;
1867 struct scsi_cmnd
*sc_cmd
;
1868 struct fc_lport
*lport
;
1869 unsigned long flags
;
1871 /* release outstanding ddp context */
1872 fc_fcp_ddp_done(fsp
);
1874 fsp
->state
|= FC_SRB_COMPL
;
1875 if (!(fsp
->state
& FC_SRB_FCP_PROCESSING_TMO
)) {
1876 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1877 del_timer_sync(&fsp
->timer
);
1878 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1882 si
= fc_get_scsi_internal(lport
);
1887 * if can_queue ramp down is done then try can_queue ramp up
1888 * since commands are completing now.
1890 if (si
->last_can_queue_ramp_down_time
)
1891 fc_fcp_can_queue_ramp_up(lport
);
1896 if (!sc_cmd
->SCp
.ptr
)
1899 CMD_SCSI_STATUS(sc_cmd
) = fsp
->cdb_status
;
1900 switch (fsp
->status_code
) {
1902 if (fsp
->cdb_status
== 0) {
1906 sc_cmd
->result
= DID_OK
<< 16;
1907 if (fsp
->scsi_resid
)
1908 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1911 * transport level I/O was ok but scsi
1912 * has non zero status
1914 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
1918 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1919 "due to FC_ERROR\n");
1920 sc_cmd
->result
= DID_ERROR
<< 16;
1922 case FC_DATA_UNDRUN
:
1923 if ((fsp
->cdb_status
== 0) && !(fsp
->req_flags
& FC_SRB_READ
)) {
1925 * scsi status is good but transport level
1928 if (fsp
->state
& FC_SRB_RCV_STATUS
) {
1929 sc_cmd
->result
= DID_OK
<< 16;
1931 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml"
1932 " due to FC_DATA_UNDRUN (trans)\n");
1933 sc_cmd
->result
= DID_ERROR
<< 16;
1937 * scsi got underrun, this is an error
1939 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1940 "due to FC_DATA_UNDRUN (scsi)\n");
1941 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1942 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1945 case FC_DATA_OVRRUN
:
1947 * overrun is an error
1949 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1950 "due to FC_DATA_OVRRUN\n");
1951 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1953 case FC_CMD_ABORTED
:
1954 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1955 "due to FC_CMD_ABORTED\n");
1956 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->io_status
;
1958 case FC_CMD_RECOVERY
:
1959 sc_cmd
->result
= (DID_BUS_BUSY
<< 16) | fsp
->io_status
;
1962 sc_cmd
->result
= (DID_RESET
<< 16);
1965 sc_cmd
->result
= (DID_NO_CONNECT
<< 16);
1968 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1969 "due to unknown error\n");
1970 sc_cmd
->result
= (DID_ERROR
<< 16);
1974 if (lport
->state
!= LPORT_ST_READY
&& fsp
->status_code
!= FC_COMPLETE
) {
1975 sc_cmd
->result
= (DID_REQUEUE
<< 16);
1976 FC_FCP_DBG(fsp
, "Returning DID_REQUEUE to scsi-ml\n");
1979 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1980 list_del(&fsp
->list
);
1981 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1982 sc_cmd
->SCp
.ptr
= NULL
;
1983 sc_cmd
->scsi_done(sc_cmd
);
1985 /* release ref from initial allocation in queue command */
1986 fc_fcp_pkt_release(fsp
);
1990 * fc_eh_abort() - Abort a command
1991 * @sc_cmd: The SCSI command to abort
1993 * From SCSI host template.
1994 * Send an ABTS to the target device and wait for the response.
1996 int fc_eh_abort(struct scsi_cmnd
*sc_cmd
)
1998 struct fc_fcp_pkt
*fsp
;
1999 struct fc_lport
*lport
;
2001 unsigned long flags
;
2003 lport
= shost_priv(sc_cmd
->device
->host
);
2004 if (lport
->state
!= LPORT_ST_READY
)
2006 else if (!lport
->link_up
)
2009 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
2010 fsp
= CMD_SP(sc_cmd
);
2012 /* command completed while scsi eh was setting up */
2013 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
2016 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2017 fc_fcp_pkt_hold(fsp
);
2018 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
2020 if (fc_fcp_lock_pkt(fsp
)) {
2021 /* completed while we were waiting for timer to be deleted */
2026 rc
= fc_fcp_pkt_abort(fsp
);
2027 fc_fcp_unlock_pkt(fsp
);
2030 fc_fcp_pkt_release(fsp
);
2033 EXPORT_SYMBOL(fc_eh_abort
);
2036 * fc_eh_device_reset() - Reset a single LUN
2037 * @sc_cmd: The SCSI command which identifies the device whose
2038 * LUN is to be reset
2040 * Set from SCSI host template.
2042 int fc_eh_device_reset(struct scsi_cmnd
*sc_cmd
)
2044 struct fc_lport
*lport
;
2045 struct fc_fcp_pkt
*fsp
;
2046 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
2050 rval
= fc_remote_port_chkready(rport
);
2054 lport
= shost_priv(sc_cmd
->device
->host
);
2056 if (lport
->state
!= LPORT_ST_READY
)
2059 FC_SCSI_DBG(lport
, "Resetting rport (%6.6x)\n", rport
->port_id
);
2061 fsp
= fc_fcp_pkt_alloc(lport
, GFP_NOIO
);
2063 printk(KERN_WARNING
"libfc: could not allocate scsi_pkt\n");
2068 * Build the libfc request pkt. Do not set the scsi cmnd, because
2069 * the sc passed in is not setup for execution like when sent
2070 * through the queuecommand callout.
2072 fsp
->lp
= lport
; /* save the softc ptr */
2073 fsp
->rport
= rport
; /* set the remote port ptr */
2076 * flush outstanding commands
2078 rc
= fc_lun_reset(lport
, fsp
, scmd_id(sc_cmd
), sc_cmd
->device
->lun
);
2079 fsp
->state
= FC_SRB_FREE
;
2080 fc_fcp_pkt_release(fsp
);
2085 EXPORT_SYMBOL(fc_eh_device_reset
);
2088 * fc_eh_host_reset() - Reset a Scsi_Host.
2089 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2091 int fc_eh_host_reset(struct scsi_cmnd
*sc_cmd
)
2093 struct Scsi_Host
*shost
= sc_cmd
->device
->host
;
2094 struct fc_lport
*lport
= shost_priv(shost
);
2095 unsigned long wait_tmo
;
2097 FC_SCSI_DBG(lport
, "Resetting host\n");
2099 lport
->tt
.lport_reset(lport
);
2100 wait_tmo
= jiffies
+ FC_HOST_RESET_TIMEOUT
;
2101 while (!fc_fcp_lport_queue_ready(lport
) && time_before(jiffies
,
2105 if (fc_fcp_lport_queue_ready(lport
)) {
2106 shost_printk(KERN_INFO
, shost
, "libfc: Host reset succeeded "
2107 "on port (%6.6x)\n", lport
->port_id
);
2110 shost_printk(KERN_INFO
, shost
, "libfc: Host reset failed, "
2111 "port (%6.6x) is not ready.\n",
2116 EXPORT_SYMBOL(fc_eh_host_reset
);
2119 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2120 * @sdev: The SCSI device that identifies the SCSI host
2122 * Configures queue depth based on host's cmd_per_len. If not set
2123 * then we use the libfc default.
2125 int fc_slave_alloc(struct scsi_device
*sdev
)
2127 struct fc_rport
*rport
= starget_to_rport(scsi_target(sdev
));
2129 if (!rport
|| fc_remote_port_chkready(rport
))
2132 if (sdev
->tagged_supported
)
2133 scsi_activate_tcq(sdev
, FC_FCP_DFLT_QUEUE_DEPTH
);
2135 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
),
2136 FC_FCP_DFLT_QUEUE_DEPTH
);
2140 EXPORT_SYMBOL(fc_slave_alloc
);
2143 * fc_change_queue_depth() - Change a device's queue depth
2144 * @sdev: The SCSI device whose queue depth is to change
2145 * @qdepth: The new queue depth
2146 * @reason: The resason for the change
2148 int fc_change_queue_depth(struct scsi_device
*sdev
, int qdepth
, int reason
)
2151 case SCSI_QDEPTH_DEFAULT
:
2152 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2154 case SCSI_QDEPTH_QFULL
:
2155 scsi_track_queue_full(sdev
, qdepth
);
2157 case SCSI_QDEPTH_RAMP_UP
:
2158 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2163 return sdev
->queue_depth
;
2165 EXPORT_SYMBOL(fc_change_queue_depth
);
2168 * fc_change_queue_type() - Change a device's queue type
2169 * @sdev: The SCSI device whose queue depth is to change
2170 * @tag_type: Identifier for queue type
2172 int fc_change_queue_type(struct scsi_device
*sdev
, int tag_type
)
2174 if (sdev
->tagged_supported
) {
2175 scsi_set_tag_type(sdev
, tag_type
);
2177 scsi_activate_tcq(sdev
, sdev
->queue_depth
);
2179 scsi_deactivate_tcq(sdev
, sdev
->queue_depth
);
2185 EXPORT_SYMBOL(fc_change_queue_type
);
2188 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2189 * @lport: The local port that no longer needs the FCP layer
2191 void fc_fcp_destroy(struct fc_lport
*lport
)
2193 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
2195 if (!list_empty(&si
->scsi_pkt_queue
))
2196 printk(KERN_ERR
"libfc: Leaked SCSI packets when destroying "
2197 "port (%6.6x)\n", lport
->port_id
);
2199 mempool_destroy(si
->scsi_pkt_pool
);
2201 lport
->scsi_priv
= NULL
;
2203 EXPORT_SYMBOL(fc_fcp_destroy
);
2209 scsi_pkt_cachep
= kmem_cache_create("libfc_fcp_pkt",
2210 sizeof(struct fc_fcp_pkt
),
2211 0, SLAB_HWCACHE_ALIGN
, NULL
);
2212 if (!scsi_pkt_cachep
) {
2213 printk(KERN_ERR
"libfc: Unable to allocate SRB cache, "
2214 "module load failed!");
2221 void fc_destroy_fcp()
2223 if (scsi_pkt_cachep
)
2224 kmem_cache_destroy(scsi_pkt_cachep
);
2228 * fc_fcp_init() - Initialize the FCP layer for a local port
2229 * @lport: The local port to initialize the exchange layer for
2231 int fc_fcp_init(struct fc_lport
*lport
)
2234 struct fc_fcp_internal
*si
;
2236 if (!lport
->tt
.fcp_cmd_send
)
2237 lport
->tt
.fcp_cmd_send
= fc_fcp_cmd_send
;
2239 if (!lport
->tt
.fcp_cleanup
)
2240 lport
->tt
.fcp_cleanup
= fc_fcp_cleanup
;
2242 if (!lport
->tt
.fcp_abort_io
)
2243 lport
->tt
.fcp_abort_io
= fc_fcp_abort_io
;
2245 si
= kzalloc(sizeof(struct fc_fcp_internal
), GFP_KERNEL
);
2248 lport
->scsi_priv
= si
;
2249 si
->max_can_queue
= lport
->host
->can_queue
;
2250 INIT_LIST_HEAD(&si
->scsi_pkt_queue
);
2251 spin_lock_init(&si
->scsi_queue_lock
);
2253 si
->scsi_pkt_pool
= mempool_create_slab_pool(2, scsi_pkt_cachep
);
2254 if (!si
->scsi_pkt_pool
) {
2264 EXPORT_SYMBOL(fc_fcp_init
);