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 static struct kmem_cache
*scsi_pkt_cachep
;
47 /* SRB state definitions */
48 #define FC_SRB_FREE 0 /* cmd is free */
49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
57 #define FC_SRB_READ (1 << 1)
58 #define FC_SRB_WRITE (1 << 0)
61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
63 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
64 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
65 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
66 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
67 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
70 * struct fc_fcp_internal - FCP layer internal data
71 * @scsi_pkt_pool: Memory pool to draw FCP packets from
72 * @scsi_queue_lock: Protects the scsi_pkt_queue
73 * @scsi_pkt_queue: Current FCP packets
74 * @last_can_queue_ramp_down_time: ramp down time
75 * @last_can_queue_ramp_up_time: ramp up time
76 * @max_can_queue: max can_queue size
78 struct fc_fcp_internal
{
79 mempool_t
*scsi_pkt_pool
;
80 spinlock_t scsi_queue_lock
;
81 struct list_head scsi_pkt_queue
;
82 unsigned long last_can_queue_ramp_down_time
;
83 unsigned long last_can_queue_ramp_up_time
;
87 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
91 * FC scsi I/O related functions
93 static void fc_fcp_recv_data(struct fc_fcp_pkt
*, struct fc_frame
*);
94 static void fc_fcp_recv(struct fc_seq
*, struct fc_frame
*, void *);
95 static void fc_fcp_resp(struct fc_fcp_pkt
*, struct fc_frame
*);
96 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*);
97 static void fc_tm_done(struct fc_seq
*, struct fc_frame
*, void *);
98 static void fc_fcp_error(struct fc_fcp_pkt
*, struct fc_frame
*);
99 static void fc_fcp_recovery(struct fc_fcp_pkt
*, u8 code
);
100 static void fc_fcp_timeout(unsigned long);
101 static void fc_fcp_rec(struct fc_fcp_pkt
*);
102 static void fc_fcp_rec_error(struct fc_fcp_pkt
*, struct fc_frame
*);
103 static void fc_fcp_rec_resp(struct fc_seq
*, struct fc_frame
*, void *);
104 static void fc_io_compl(struct fc_fcp_pkt
*);
106 static void fc_fcp_srr(struct fc_fcp_pkt
*, enum fc_rctl
, u32
);
107 static void fc_fcp_srr_resp(struct fc_seq
*, struct fc_frame
*, void *);
108 static void fc_fcp_srr_error(struct fc_fcp_pkt
*, struct fc_frame
*);
111 * command status codes
113 #define FC_COMPLETE 0
114 #define FC_CMD_ABORTED 1
115 #define FC_CMD_RESET 2
116 #define FC_CMD_PLOGO 3
118 #define FC_TRANS_ERR 5
119 #define FC_DATA_OVRRUN 6
120 #define FC_DATA_UNDRUN 7
122 #define FC_HRD_ERROR 9
123 #define FC_CRC_ERROR 10
124 #define FC_TIMED_OUT 11
127 * Error recovery timeout values.
129 #define FC_SCSI_TM_TOV (10 * HZ)
130 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
131 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
133 #define FC_MAX_ERROR_CNT 5
134 #define FC_MAX_RECOV_RETRY 3
136 #define FC_FCP_DFLT_QUEUE_DEPTH 32
139 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
140 * @lport: The local port that the FCP packet is for
141 * @gfp: GFP flags for allocation
143 * Return value: fcp_pkt structure or null on allocation failure.
144 * Context: Can be called from process context, no lock is required.
146 static struct fc_fcp_pkt
*fc_fcp_pkt_alloc(struct fc_lport
*lport
, gfp_t gfp
)
148 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
149 struct fc_fcp_pkt
*fsp
;
151 fsp
= mempool_alloc(si
->scsi_pkt_pool
, gfp
);
153 memset(fsp
, 0, sizeof(*fsp
));
155 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
156 atomic_set(&fsp
->ref_cnt
, 1);
157 init_timer(&fsp
->timer
);
158 INIT_LIST_HEAD(&fsp
->list
);
159 spin_lock_init(&fsp
->scsi_pkt_lock
);
165 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
166 * @fsp: The FCP packet to be released
168 * Context: Can be called from process or interrupt context,
169 * no lock is required.
171 static void fc_fcp_pkt_release(struct fc_fcp_pkt
*fsp
)
173 if (atomic_dec_and_test(&fsp
->ref_cnt
)) {
174 struct fc_fcp_internal
*si
= fc_get_scsi_internal(fsp
->lp
);
176 mempool_free(fsp
, si
->scsi_pkt_pool
);
181 * fc_fcp_pkt_hold() - Hold a fcp_pkt
182 * @fsp: The FCP packet to be held
184 static void fc_fcp_pkt_hold(struct fc_fcp_pkt
*fsp
)
186 atomic_inc(&fsp
->ref_cnt
);
190 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
191 * @seq: The sequence that the FCP packet is on (required by destructor API)
192 * @fsp: The FCP packet to be released
194 * This routine is called by a destructor callback in the exch_seq_send()
195 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
196 * argument even though it is not used by this routine.
198 * Context: No locking required.
200 static void fc_fcp_pkt_destroy(struct fc_seq
*seq
, void *fsp
)
202 fc_fcp_pkt_release(fsp
);
206 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
207 * @fsp: The FCP packet to be locked and incremented
209 * We should only return error if we return a command to SCSI-ml before
210 * getting a response. This can happen in cases where we send a abort, but
211 * do not wait for the response and the abort and command can be passing
212 * each other on the wire/network-layer.
214 * Note: this function locks the packet and gets a reference to allow
215 * callers to call the completion function while the lock is held and
216 * not have to worry about the packets refcount.
218 * TODO: Maybe we should just have callers grab/release the lock and
219 * have a function that they call to verify the fsp and grab a ref if
222 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt
*fsp
)
224 spin_lock_bh(&fsp
->scsi_pkt_lock
);
225 if (fsp
->state
& FC_SRB_COMPL
) {
226 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
230 fc_fcp_pkt_hold(fsp
);
235 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
237 * @fsp: The FCP packet to be unlocked and decremented
239 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt
*fsp
)
241 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
242 fc_fcp_pkt_release(fsp
);
246 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
247 * @fsp: The FCP packet to start a timer for
248 * @delay: The timeout period in jiffies
250 static void fc_fcp_timer_set(struct fc_fcp_pkt
*fsp
, unsigned long delay
)
252 if (!(fsp
->state
& FC_SRB_COMPL
))
253 mod_timer(&fsp
->timer
, jiffies
+ delay
);
257 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
259 * @fsp: The FCP packet to abort exchanges on
261 static int fc_fcp_send_abort(struct fc_fcp_pkt
*fsp
)
266 fsp
->state
|= FC_SRB_ABORT_PENDING
;
267 return fsp
->lp
->tt
.seq_exch_abort(fsp
->seq_ptr
, 0);
271 * fc_fcp_retry_cmd() - Retry a fcp_pkt
272 * @fsp: The FCP packet to be retried
274 * Sets the status code to be FC_ERROR and then calls
275 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
276 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
277 * The SCSI-ml will retry the command.
279 static void fc_fcp_retry_cmd(struct fc_fcp_pkt
*fsp
)
282 fsp
->lp
->tt
.exch_done(fsp
->seq_ptr
);
286 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
288 fsp
->status_code
= FC_ERROR
;
289 fc_fcp_complete_locked(fsp
);
293 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
294 * @fsp: The FCP packet that will manage the DDP frames
295 * @xid: The XID that will be used for the DDP exchange
297 void fc_fcp_ddp_setup(struct fc_fcp_pkt
*fsp
, u16 xid
)
299 struct fc_lport
*lport
;
302 if ((fsp
->req_flags
& FC_SRB_READ
) &&
303 (lport
->lro_enabled
) && (lport
->tt
.ddp_setup
)) {
304 if (lport
->tt
.ddp_setup(lport
, xid
, scsi_sglist(fsp
->cmd
),
305 scsi_sg_count(fsp
->cmd
)))
311 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
312 * DDP related resources for a fcp_pkt
313 * @fsp: The FCP packet that DDP had been used on
315 void fc_fcp_ddp_done(struct fc_fcp_pkt
*fsp
)
317 struct fc_lport
*lport
;
322 if (fsp
->xfer_ddp
== FC_XID_UNKNOWN
)
326 if (lport
->tt
.ddp_done
) {
327 fsp
->xfer_len
= lport
->tt
.ddp_done(lport
, fsp
->xfer_ddp
);
328 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
333 * fc_fcp_can_queue_ramp_up() - increases can_queue
334 * @lport: lport to ramp up can_queue
336 static void fc_fcp_can_queue_ramp_up(struct fc_lport
*lport
)
338 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
342 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
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
);
365 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
369 * fc_fcp_can_queue_ramp_down() - reduces can_queue
370 * @lport: lport to reduce can_queue
372 * If we are getting memory allocation failures, then we may
373 * be trying to execute too many commands. We let the running
374 * commands complete or timeout, then try again with a reduced
375 * can_queue. Eventually we will hit the point where we run
376 * on all reserved structs.
378 static void fc_fcp_can_queue_ramp_down(struct fc_lport
*lport
)
380 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
384 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
386 if (si
->last_can_queue_ramp_down_time
&&
387 (time_before(jiffies
, si
->last_can_queue_ramp_down_time
+
388 FC_CAN_QUEUE_PERIOD
)))
391 si
->last_can_queue_ramp_down_time
= jiffies
;
393 can_queue
= lport
->host
->can_queue
;
397 lport
->host
->can_queue
= can_queue
;
398 shost_printk(KERN_ERR
, lport
->host
, "libfc: Could not allocate frame.\n"
399 "Reducing can_queue to %d.\n", can_queue
);
402 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
406 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
407 * @lport: fc lport struct
408 * @len: payload length
410 * Allocates fc_frame structure and buffer but if fails to allocate
411 * then reduce can_queue.
413 static inline struct fc_frame
*fc_fcp_frame_alloc(struct fc_lport
*lport
,
418 fp
= fc_frame_alloc(lport
, len
);
423 fc_fcp_can_queue_ramp_down(lport
);
428 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
429 * @fsp: The FCP packet the data is on
430 * @fp: The data frame
432 static void fc_fcp_recv_data(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
434 struct scsi_cmnd
*sc
= fsp
->cmd
;
435 struct fc_lport
*lport
= fsp
->lp
;
436 struct fcoe_dev_stats
*stats
;
437 struct fc_frame_header
*fh
;
444 struct scatterlist
*sg
;
446 u8 host_bcode
= FC_COMPLETE
;
448 fh
= fc_frame_header_get(fp
);
449 offset
= ntohl(fh
->fh_parm_offset
);
450 start_offset
= offset
;
451 len
= fr_len(fp
) - sizeof(*fh
);
452 buf
= fc_frame_payload_get(fp
, 0);
455 * if this I/O is ddped then clear it and initiate recovery since data
456 * frames are expected to be placed directly in that case.
458 * Indicate error to scsi-ml because something went wrong with the
459 * ddp handling to get us here.
461 if (fsp
->xfer_ddp
!= FC_XID_UNKNOWN
) {
462 fc_fcp_ddp_done(fsp
);
463 FC_FCP_DBG(fsp
, "DDP I/O in fc_fcp_recv_data set ERROR\n");
464 host_bcode
= FC_ERROR
;
467 if (offset
+ len
> fsp
->data_len
) {
468 /* this should never happen */
469 if ((fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) &&
470 fc_frame_crc_check(fp
))
472 FC_FCP_DBG(fsp
, "data received past end. len %zx offset %zx "
473 "data_len %x\n", len
, offset
, fsp
->data_len
);
475 /* Data is corrupted indicate scsi-ml should retry */
476 host_bcode
= FC_DATA_OVRRUN
;
479 if (offset
!= fsp
->xfer_len
)
480 fsp
->state
|= FC_SRB_DISCONTIG
;
482 sg
= scsi_sglist(sc
);
483 nents
= scsi_sg_count(sc
);
485 if (!(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)) {
486 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
487 &offset
, KM_SOFTIRQ0
, NULL
);
489 crc
= crc32(~0, (u8
*) fh
, sizeof(*fh
));
490 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
491 &offset
, KM_SOFTIRQ0
, &crc
);
492 buf
= fc_frame_payload_get(fp
, 0);
494 crc
= crc32(crc
, buf
+ len
, 4 - (len
% 4));
496 if (~crc
!= le32_to_cpu(fr_crc(fp
))) {
498 stats
= per_cpu_ptr(lport
->dev_stats
, get_cpu());
499 stats
->ErrorFrames
++;
500 /* per cpu count, not total count, but OK for limit */
501 if (stats
->InvalidCRCCount
++ < FC_MAX_ERROR_CNT
)
502 printk(KERN_WARNING
"libfc: CRC error on data "
503 "frame for port (%6.6x)\n",
507 * Assume the frame is total garbage.
508 * We may have copied it over the good part
510 * If so, we need to retry the entire operation.
511 * Otherwise, ignore it.
513 if (fsp
->state
& FC_SRB_DISCONTIG
) {
514 host_bcode
= FC_CRC_ERROR
;
521 if (fsp
->xfer_contig_end
== start_offset
)
522 fsp
->xfer_contig_end
+= copy_len
;
523 fsp
->xfer_len
+= copy_len
;
526 * In the very rare event that this data arrived after the response
527 * and completes the transfer, call the completion handler.
529 if (unlikely(fsp
->state
& FC_SRB_RCV_STATUS
) &&
530 fsp
->xfer_len
== fsp
->data_len
- fsp
->scsi_resid
)
531 fc_fcp_complete_locked(fsp
);
534 fc_fcp_recovery(fsp
, host_bcode
);
538 * fc_fcp_send_data() - Send SCSI data to a target
539 * @fsp: The FCP packet the data is on
540 * @sp: The sequence the data is to be sent on
541 * @offset: The starting offset for this data request
542 * @seq_blen: The burst length for this data request
544 * Called after receiving a Transfer Ready data descriptor.
545 * If the LLD is capable of sequence offload then send down the
546 * seq_blen amount of data in single frame, otherwise send
547 * multiple frames of the maximum frame payload supported by
550 static int fc_fcp_send_data(struct fc_fcp_pkt
*fsp
, struct fc_seq
*seq
,
551 size_t offset
, size_t seq_blen
)
554 struct scsi_cmnd
*sc
;
555 struct scatterlist
*sg
;
556 struct fc_frame
*fp
= NULL
;
557 struct fc_lport
*lport
= fsp
->lp
;
563 size_t frame_offset
, fh_parm_offset
;
568 int using_sg
= lport
->sg_supp
;
571 WARN_ON(seq_blen
<= 0);
572 if (unlikely(offset
+ seq_blen
> fsp
->data_len
)) {
573 /* this should never happen */
574 FC_FCP_DBG(fsp
, "xfer-ready past end. seq_blen %zx "
575 "offset %zx\n", seq_blen
, offset
);
576 fc_fcp_send_abort(fsp
);
578 } else if (offset
!= fsp
->xfer_len
) {
579 /* Out of Order Data Request - no problem, but unexpected. */
580 FC_FCP_DBG(fsp
, "xfer-ready non-contiguous. "
581 "seq_blen %zx offset %zx\n", seq_blen
, offset
);
585 * if LLD is capable of seq_offload then set transport
586 * burst length (t_blen) to seq_blen, otherwise set t_blen
587 * to max FC frame payload previously set in fsp->max_payload.
589 t_blen
= fsp
->max_payload
;
590 if (lport
->seq_offload
) {
591 t_blen
= min(seq_blen
, (size_t)lport
->lso_max
);
592 FC_FCP_DBG(fsp
, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
593 fsp
, seq_blen
, lport
->lso_max
, t_blen
);
597 t_blen
&= ~(512 - 1); /* round down to block size */
600 remaining
= seq_blen
;
601 fh_parm_offset
= frame_offset
= offset
;
603 seq
= lport
->tt
.seq_start_next(seq
);
604 f_ctl
= FC_FC_REL_OFF
;
607 sg
= scsi_sglist(sc
);
609 while (remaining
> 0 && sg
) {
610 if (offset
>= sg
->length
) {
611 offset
-= sg
->length
;
616 tlen
= min(t_blen
, remaining
);
619 * TODO. Temporary workaround. fc_seq_send() can't
620 * handle odd lengths in non-linear skbs.
621 * This will be the final fragment only.
625 fp
= fc_frame_alloc(lport
, using_sg
? 0 : tlen
);
629 data
= fc_frame_header_get(fp
) + 1;
630 fh_parm_offset
= frame_offset
;
631 fr_max_payload(fp
) = fsp
->max_payload
;
634 off
= offset
+ sg
->offset
;
635 sg_bytes
= min(tlen
, sg
->length
- offset
);
636 sg_bytes
= min(sg_bytes
,
637 (size_t) (PAGE_SIZE
- (off
& ~PAGE_MASK
)));
638 page
= sg_page(sg
) + (off
>> PAGE_SHIFT
);
641 skb_fill_page_desc(fp_skb(fp
),
642 skb_shinfo(fp_skb(fp
))->nr_frags
,
643 page
, off
& ~PAGE_MASK
, sg_bytes
);
644 fp_skb(fp
)->data_len
+= sg_bytes
;
645 fr_len(fp
) += sg_bytes
;
646 fp_skb(fp
)->truesize
+= PAGE_SIZE
;
649 * The scatterlist item may be bigger than PAGE_SIZE,
650 * but we must not cross pages inside the kmap.
652 page_addr
= kmap_atomic(page
, KM_SOFTIRQ0
);
653 memcpy(data
, (char *)page_addr
+ (off
& ~PAGE_MASK
),
655 kunmap_atomic(page_addr
, KM_SOFTIRQ0
);
659 frame_offset
+= sg_bytes
;
661 remaining
-= sg_bytes
;
663 if ((skb_shinfo(fp_skb(fp
))->nr_frags
< FC_FRAME_SG_LEN
) &&
668 * Send sequence with transfer sequence initiative in case
669 * this is last FCP frame of the sequence.
672 f_ctl
|= FC_FC_SEQ_INIT
| FC_FC_END_SEQ
;
674 ep
= fc_seq_exch(seq
);
675 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
676 FC_TYPE_FCP
, f_ctl
, fh_parm_offset
);
679 * send fragment using for a sequence.
681 error
= lport
->tt
.seq_send(lport
, seq
, fp
);
683 WARN_ON(1); /* send error should be rare */
688 fsp
->xfer_len
+= seq_blen
; /* premature count? */
693 * fc_fcp_abts_resp() - Receive an ABTS response
694 * @fsp: The FCP packet that is being aborted
695 * @fp: The response frame
697 static void fc_fcp_abts_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
700 struct fc_ba_rjt
*brp
;
701 struct fc_frame_header
*fh
;
703 fh
= fc_frame_header_get(fp
);
704 switch (fh
->fh_r_ctl
) {
708 brp
= fc_frame_payload_get(fp
, sizeof(*brp
));
709 if (brp
&& brp
->br_reason
== FC_BA_RJT_LOG_ERR
)
714 * we will let the command timeout
715 * and scsi-ml recover in this case,
716 * therefore cleared the ba_done flag.
722 fsp
->state
|= FC_SRB_ABORTED
;
723 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
725 if (fsp
->wait_for_comp
)
726 complete(&fsp
->tm_done
);
728 fc_fcp_complete_locked(fsp
);
733 * fc_fcp_recv() - Receive an FCP frame
734 * @seq: The sequence the frame is on
735 * @fp: The received frame
736 * @arg: The related FCP packet
738 * Context: Called from Soft IRQ context. Can not be called
739 * holding the FCP packet list lock.
741 static void fc_fcp_recv(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
743 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
744 struct fc_lport
*lport
= fsp
->lp
;
745 struct fc_frame_header
*fh
;
746 struct fcp_txrdy
*dd
;
751 fc_fcp_error(fsp
, fp
);
755 fh
= fc_frame_header_get(fp
);
756 r_ctl
= fh
->fh_r_ctl
;
758 if (lport
->state
!= LPORT_ST_READY
)
760 if (fc_fcp_lock_pkt(fsp
))
762 fsp
->last_pkt_time
= jiffies
;
764 if (fh
->fh_type
== FC_TYPE_BLS
) {
765 fc_fcp_abts_resp(fsp
, fp
);
769 if (fsp
->state
& (FC_SRB_ABORTED
| FC_SRB_ABORT_PENDING
))
772 if (r_ctl
== FC_RCTL_DD_DATA_DESC
) {
774 * received XFER RDY from the target
775 * need to send data to the target
777 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
778 dd
= fc_frame_payload_get(fp
, sizeof(*dd
));
781 rc
= fc_fcp_send_data(fsp
, seq
,
782 (size_t) ntohl(dd
->ft_data_ro
),
783 (size_t) ntohl(dd
->ft_burst_len
));
785 seq
->rec_data
= fsp
->xfer_len
;
786 } else if (r_ctl
== FC_RCTL_DD_SOL_DATA
) {
788 * received a DATA frame
789 * next we will copy the data to the system buffer
791 WARN_ON(fr_len(fp
) < sizeof(*fh
)); /* len may be 0 */
792 fc_fcp_recv_data(fsp
, fp
);
793 seq
->rec_data
= fsp
->xfer_contig_end
;
794 } else if (r_ctl
== FC_RCTL_DD_CMD_STATUS
) {
795 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
797 fc_fcp_resp(fsp
, fp
);
799 FC_FCP_DBG(fsp
, "unexpected frame. r_ctl %x\n", r_ctl
);
802 fc_fcp_unlock_pkt(fsp
);
808 * fc_fcp_resp() - Handler for FCP responses
809 * @fsp: The FCP packet the response is for
810 * @fp: The response frame
812 static void fc_fcp_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
814 struct fc_frame_header
*fh
;
815 struct fcp_resp
*fc_rp
;
816 struct fcp_resp_ext
*rp_ex
;
817 struct fcp_resp_rsp_info
*fc_rp_info
;
825 fh
= (struct fc_frame_header
*)fr_hdr(fp
);
826 if (unlikely(plen
< sizeof(*fh
) + sizeof(*fc_rp
)))
829 fc_rp
= (struct fcp_resp
*)(fh
+ 1);
830 fsp
->cdb_status
= fc_rp
->fr_status
;
831 flags
= fc_rp
->fr_flags
;
832 fsp
->scsi_comp_flags
= flags
;
833 expected_len
= fsp
->data_len
;
835 /* if ddp, update xfer len */
836 fc_fcp_ddp_done(fsp
);
838 if (unlikely((flags
& ~FCP_CONF_REQ
) || fc_rp
->fr_status
)) {
839 rp_ex
= (void *)(fc_rp
+ 1);
840 if (flags
& (FCP_RSP_LEN_VAL
| FCP_SNS_LEN_VAL
)) {
841 if (plen
< sizeof(*fc_rp
) + sizeof(*rp_ex
))
843 fc_rp_info
= (struct fcp_resp_rsp_info
*)(rp_ex
+ 1);
844 if (flags
& FCP_RSP_LEN_VAL
) {
845 respl
= ntohl(rp_ex
->fr_rsp_len
);
846 if (respl
!= sizeof(*fc_rp_info
))
848 if (fsp
->wait_for_comp
) {
849 /* Abuse cdb_status for rsp code */
850 fsp
->cdb_status
= fc_rp_info
->rsp_code
;
851 complete(&fsp
->tm_done
);
853 * tmfs will not have any scsi cmd so
859 if (flags
& FCP_SNS_LEN_VAL
) {
860 snsl
= ntohl(rp_ex
->fr_sns_len
);
861 if (snsl
> SCSI_SENSE_BUFFERSIZE
)
862 snsl
= SCSI_SENSE_BUFFERSIZE
;
863 memcpy(fsp
->cmd
->sense_buffer
,
864 (char *)fc_rp_info
+ respl
, snsl
);
867 if (flags
& (FCP_RESID_UNDER
| FCP_RESID_OVER
)) {
868 if (plen
< sizeof(*fc_rp
) + sizeof(rp_ex
->fr_resid
))
870 if (flags
& FCP_RESID_UNDER
) {
871 fsp
->scsi_resid
= ntohl(rp_ex
->fr_resid
);
873 * The cmnd->underflow is the minimum number of
874 * bytes that must be transferred for this
875 * command. Provided a sense condition is not
876 * present, make sure the actual amount
877 * transferred is at least the underflow value
880 if (!(flags
& FCP_SNS_LEN_VAL
) &&
881 (fc_rp
->fr_status
== 0) &&
882 (scsi_bufflen(fsp
->cmd
) -
883 fsp
->scsi_resid
) < fsp
->cmd
->underflow
)
885 expected_len
-= fsp
->scsi_resid
;
887 fsp
->status_code
= FC_ERROR
;
891 fsp
->state
|= FC_SRB_RCV_STATUS
;
894 * Check for missing or extra data frames.
896 if (unlikely(fsp
->xfer_len
!= expected_len
)) {
897 if (fsp
->xfer_len
< expected_len
) {
899 * Some data may be queued locally,
900 * Wait a at least one jiffy to see if it is delivered.
901 * If this expires without data, we may do SRR.
903 fc_fcp_timer_set(fsp
, 2);
906 fsp
->status_code
= FC_DATA_OVRRUN
;
907 FC_FCP_DBG(fsp
, "tgt %6.6x xfer len %zx greater than expected, "
908 "len %x, data len %x\n",
910 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
912 fc_fcp_complete_locked(fsp
);
916 FC_FCP_DBG(fsp
, "short FCP response. flags 0x%x len %u respl %u "
917 "snsl %u\n", flags
, fr_len(fp
), respl
, snsl
);
919 fsp
->status_code
= FC_ERROR
;
920 fc_fcp_complete_locked(fsp
);
924 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
926 * @fsp: The FCP packet to be completed
928 * This function may sleep if a timer is pending. The packet lock must be
929 * held, and the host lock must not be held.
931 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*fsp
)
933 struct fc_lport
*lport
= fsp
->lp
;
938 if (fsp
->state
& FC_SRB_ABORT_PENDING
)
941 if (fsp
->state
& FC_SRB_ABORTED
) {
942 if (!fsp
->status_code
)
943 fsp
->status_code
= FC_CMD_ABORTED
;
946 * Test for transport underrun, independent of response
949 if (fsp
->xfer_len
< fsp
->data_len
&& !fsp
->io_status
&&
950 (!(fsp
->scsi_comp_flags
& FCP_RESID_UNDER
) ||
951 fsp
->xfer_len
< fsp
->data_len
- fsp
->scsi_resid
)) {
952 fsp
->status_code
= FC_DATA_UNDRUN
;
960 if (unlikely(fsp
->scsi_comp_flags
& FCP_CONF_REQ
)) {
961 struct fc_frame
*conf_frame
;
964 csp
= lport
->tt
.seq_start_next(seq
);
965 conf_frame
= fc_fcp_frame_alloc(fsp
->lp
, 0);
967 f_ctl
= FC_FC_SEQ_INIT
;
968 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
969 ep
= fc_seq_exch(seq
);
970 fc_fill_fc_hdr(conf_frame
, FC_RCTL_DD_SOL_CTL
,
972 FC_TYPE_FCP
, f_ctl
, 0);
973 lport
->tt
.seq_send(lport
, csp
, conf_frame
);
976 lport
->tt
.exch_done(seq
);
979 * Some resets driven by SCSI are not I/Os and do not have
980 * SCSI commands associated with the requests. We should not
981 * call I/O completion if we do not have a SCSI command.
988 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
989 * @fsp: The FCP packet whose exchanges should be canceled
990 * @error: The reason for the cancellation
992 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt
*fsp
, int error
)
994 struct fc_lport
*lport
= fsp
->lp
;
997 lport
->tt
.exch_done(fsp
->seq_ptr
);
1000 fsp
->status_code
= error
;
1004 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1005 * @lport: The local port whose exchanges should be canceled
1006 * @id: The target's ID
1008 * @error: The reason for cancellation
1010 * If lun or id is -1, they are ignored.
1012 static void fc_fcp_cleanup_each_cmd(struct fc_lport
*lport
, unsigned int id
,
1013 unsigned int lun
, int error
)
1015 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1016 struct fc_fcp_pkt
*fsp
;
1017 struct scsi_cmnd
*sc_cmd
;
1018 unsigned long flags
;
1020 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1022 list_for_each_entry(fsp
, &si
->scsi_pkt_queue
, list
) {
1024 if (id
!= -1 && scmd_id(sc_cmd
) != id
)
1027 if (lun
!= -1 && sc_cmd
->device
->lun
!= lun
)
1030 fc_fcp_pkt_hold(fsp
);
1031 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1033 if (!fc_fcp_lock_pkt(fsp
)) {
1034 fc_fcp_cleanup_cmd(fsp
, error
);
1036 fc_fcp_unlock_pkt(fsp
);
1039 fc_fcp_pkt_release(fsp
);
1040 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1042 * while we dropped the lock multiple pkts could
1043 * have been released, so we have to start over.
1047 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1051 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1052 * @lport: The local port whose exchanges are to be aborted
1054 static void fc_fcp_abort_io(struct fc_lport
*lport
)
1056 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_HRD_ERROR
);
1060 * fc_fcp_pkt_send() - Send a fcp_pkt
1061 * @lport: The local port to send the FCP packet on
1062 * @fsp: The FCP packet to send
1064 * Return: Zero for success and -1 for failure
1065 * Locks: Called without locks held
1067 static int fc_fcp_pkt_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
)
1069 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1070 unsigned long flags
;
1073 fsp
->cmd
->SCp
.ptr
= (char *)fsp
;
1074 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1075 fsp
->cdb_cmd
.fc_flags
= fsp
->req_flags
& ~FCP_CFL_LEN_MASK
;
1077 int_to_scsilun(fsp
->cmd
->device
->lun
,
1078 (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1079 memcpy(fsp
->cdb_cmd
.fc_cdb
, fsp
->cmd
->cmnd
, fsp
->cmd
->cmd_len
);
1081 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1082 list_add_tail(&fsp
->list
, &si
->scsi_pkt_queue
);
1083 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1084 rc
= lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_fcp_recv
);
1086 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1087 fsp
->cmd
->SCp
.ptr
= NULL
;
1088 list_del(&fsp
->list
);
1089 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1096 * get_fsp_rec_tov() - Helper function to get REC_TOV
1097 * @fsp: the FCP packet
1099 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
1101 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt
*fsp
)
1103 struct fc_rport_libfc_priv
*rpriv
= fsp
->rport
->dd_data
;
1105 return msecs_to_jiffies(rpriv
->e_d_tov
) + HZ
;
1109 * fc_fcp_cmd_send() - Send a FCP command
1110 * @lport: The local port to send the command on
1111 * @fsp: The FCP packet the command is on
1112 * @resp: The handler for the response
1114 static int fc_fcp_cmd_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1115 void (*resp
)(struct fc_seq
*,
1116 struct fc_frame
*fp
,
1119 struct fc_frame
*fp
;
1121 struct fc_rport
*rport
;
1122 struct fc_rport_libfc_priv
*rpriv
;
1123 const size_t len
= sizeof(fsp
->cdb_cmd
);
1126 if (fc_fcp_lock_pkt(fsp
))
1129 fp
= fc_fcp_frame_alloc(lport
, sizeof(fsp
->cdb_cmd
));
1135 memcpy(fc_frame_payload_get(fp
, len
), &fsp
->cdb_cmd
, len
);
1138 fsp
->max_payload
= rport
->maxframe_size
;
1139 rpriv
= rport
->dd_data
;
1141 fc_fill_fc_hdr(fp
, FC_RCTL_DD_UNSOL_CMD
, rport
->port_id
,
1142 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1145 seq
= lport
->tt
.exch_seq_send(lport
, fp
, resp
, fc_fcp_pkt_destroy
,
1151 fsp
->last_pkt_time
= jiffies
;
1153 fc_fcp_pkt_hold(fsp
); /* hold for fc_fcp_pkt_destroy */
1155 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1156 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1157 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1160 fc_fcp_unlock_pkt(fsp
);
1165 * fc_fcp_error() - Handler for FCP layer errors
1166 * @fsp: The FCP packet the error is on
1167 * @fp: The frame that has errored
1169 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1171 int error
= PTR_ERR(fp
);
1173 if (fc_fcp_lock_pkt(fsp
))
1176 if (error
== -FC_EX_CLOSED
) {
1177 fc_fcp_retry_cmd(fsp
);
1182 * clear abort pending, because the lower layer
1183 * decided to force completion.
1185 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
1186 fsp
->status_code
= FC_CMD_PLOGO
;
1187 fc_fcp_complete_locked(fsp
);
1189 fc_fcp_unlock_pkt(fsp
);
1193 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1194 * @fsp: The FCP packet to abort on
1196 * Called to send an abort and then wait for abort completion
1198 static int fc_fcp_pkt_abort(struct fc_fcp_pkt
*fsp
)
1201 unsigned long ticks_left
;
1203 if (fc_fcp_send_abort(fsp
))
1206 init_completion(&fsp
->tm_done
);
1207 fsp
->wait_for_comp
= 1;
1209 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1210 ticks_left
= wait_for_completion_timeout(&fsp
->tm_done
,
1212 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1213 fsp
->wait_for_comp
= 0;
1216 FC_FCP_DBG(fsp
, "target abort cmd failed\n");
1217 } else if (fsp
->state
& FC_SRB_ABORTED
) {
1218 FC_FCP_DBG(fsp
, "target abort cmd passed\n");
1220 fc_fcp_complete_locked(fsp
);
1227 * fc_lun_reset_send() - Send LUN reset command
1228 * @data: The FCP packet that identifies the LUN to be reset
1230 static void fc_lun_reset_send(unsigned long data
)
1232 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1233 struct fc_lport
*lport
= fsp
->lp
;
1235 if (lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_tm_done
)) {
1236 if (fsp
->recov_retry
++ >= FC_MAX_RECOV_RETRY
)
1238 if (fc_fcp_lock_pkt(fsp
))
1240 setup_timer(&fsp
->timer
, fc_lun_reset_send
, (unsigned long)fsp
);
1241 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1242 fc_fcp_unlock_pkt(fsp
);
1247 * fc_lun_reset() - Send a LUN RESET command to a device
1248 * and wait for the reply
1249 * @lport: The local port to sent the command on
1250 * @fsp: The FCP packet that identifies the LUN to be reset
1251 * @id: The SCSI command ID
1252 * @lun: The LUN ID to be reset
1254 static int fc_lun_reset(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1255 unsigned int id
, unsigned int lun
)
1259 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1260 fsp
->cdb_cmd
.fc_tm_flags
= FCP_TMF_LUN_RESET
;
1261 int_to_scsilun(lun
, (struct scsi_lun
*)fsp
->cdb_cmd
.fc_lun
);
1263 fsp
->wait_for_comp
= 1;
1264 init_completion(&fsp
->tm_done
);
1266 fc_lun_reset_send((unsigned long)fsp
);
1269 * wait for completion of reset
1270 * after that make sure all commands are terminated
1272 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1274 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1275 fsp
->state
|= FC_SRB_COMPL
;
1276 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1278 del_timer_sync(&fsp
->timer
);
1280 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1282 lport
->tt
.exch_done(fsp
->seq_ptr
);
1283 fsp
->seq_ptr
= NULL
;
1285 fsp
->wait_for_comp
= 0;
1286 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1289 FC_SCSI_DBG(lport
, "lun reset failed\n");
1293 /* cdb_status holds the tmf's rsp code */
1294 if (fsp
->cdb_status
!= FCP_TMF_CMPL
)
1297 FC_SCSI_DBG(lport
, "lun reset to lun %u completed\n", lun
);
1298 fc_fcp_cleanup_each_cmd(lport
, id
, lun
, FC_CMD_ABORTED
);
1303 * fc_tm_done() - Task Management response handler
1304 * @seq: The sequence that the response is on
1305 * @fp: The response frame
1306 * @arg: The FCP packet the response is for
1308 static void fc_tm_done(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1310 struct fc_fcp_pkt
*fsp
= arg
;
1311 struct fc_frame_header
*fh
;
1315 * If there is an error just let it timeout or wait
1316 * for TMF to be aborted if it timedout.
1318 * scsi-eh will escalate for when either happens.
1323 if (fc_fcp_lock_pkt(fsp
))
1327 * raced with eh timeout handler.
1329 if (!fsp
->seq_ptr
|| !fsp
->wait_for_comp
)
1332 fh
= fc_frame_header_get(fp
);
1333 if (fh
->fh_type
!= FC_TYPE_BLS
)
1334 fc_fcp_resp(fsp
, fp
);
1335 fsp
->seq_ptr
= NULL
;
1336 fsp
->lp
->tt
.exch_done(seq
);
1338 fc_fcp_unlock_pkt(fsp
);
1344 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1345 * @lport: The local port to be cleaned up
1347 static void fc_fcp_cleanup(struct fc_lport
*lport
)
1349 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_ERROR
);
1353 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1354 * @data: The FCP packet that has timed out
1356 * If REC is supported then just issue it and return. The REC exchange will
1357 * complete or time out and recovery can continue at that point. Otherwise,
1358 * if the response has been received without all the data it has been
1359 * ER_TIMEOUT since the response was received. If the response has not been
1360 * received we see if data was received recently. If it has been then we
1361 * continue waiting, otherwise, we abort the command.
1363 static void fc_fcp_timeout(unsigned long data
)
1365 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1366 struct fc_rport
*rport
= fsp
->rport
;
1367 struct fc_rport_libfc_priv
*rpriv
= rport
->dd_data
;
1369 if (fc_fcp_lock_pkt(fsp
))
1372 if (fsp
->cdb_cmd
.fc_tm_flags
)
1375 fsp
->state
|= FC_SRB_FCP_PROCESSING_TMO
;
1377 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1379 else if (fsp
->state
& FC_SRB_RCV_STATUS
)
1380 fc_fcp_complete_locked(fsp
);
1382 fc_fcp_recovery(fsp
, FC_TIMED_OUT
);
1383 fsp
->state
&= ~FC_SRB_FCP_PROCESSING_TMO
;
1385 fc_fcp_unlock_pkt(fsp
);
1389 * fc_fcp_rec() - Send a REC ELS request
1390 * @fsp: The FCP packet to send the REC request on
1392 static void fc_fcp_rec(struct fc_fcp_pkt
*fsp
)
1394 struct fc_lport
*lport
;
1395 struct fc_frame
*fp
;
1396 struct fc_rport
*rport
;
1397 struct fc_rport_libfc_priv
*rpriv
;
1401 rpriv
= rport
->dd_data
;
1402 if (!fsp
->seq_ptr
|| rpriv
->rp_state
!= RPORT_ST_READY
) {
1403 fsp
->status_code
= FC_HRD_ERROR
;
1405 fc_fcp_complete_locked(fsp
);
1409 fp
= fc_fcp_frame_alloc(lport
, sizeof(struct fc_els_rec
));
1413 fr_seq(fp
) = fsp
->seq_ptr
;
1414 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, rport
->port_id
,
1415 rpriv
->local_port
->port_id
, FC_TYPE_ELS
,
1417 if (lport
->tt
.elsct_send(lport
, rport
->port_id
, fp
, ELS_REC
,
1418 fc_fcp_rec_resp
, fsp
,
1419 2 * lport
->r_a_tov
)) {
1420 fc_fcp_pkt_hold(fsp
); /* hold while REC outstanding */
1424 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1425 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1427 fc_fcp_recovery(fsp
, FC_TIMED_OUT
);
1431 * fc_fcp_rec_resp() - Handler for REC ELS responses
1432 * @seq: The sequence the response is on
1433 * @fp: The response frame
1434 * @arg: The FCP packet the response is on
1436 * If the response is a reject then the scsi layer will handle
1437 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1438 * set the timeout and return. If the I/O was completed then complete the
1439 * exchange and tell the SCSI layer.
1441 static void fc_fcp_rec_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1443 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
1444 struct fc_els_rec_acc
*recp
;
1445 struct fc_els_ls_rjt
*rjt
;
1449 enum dma_data_direction data_dir
;
1451 struct fc_rport_libfc_priv
*rpriv
;
1454 fc_fcp_rec_error(fsp
, fp
);
1458 if (fc_fcp_lock_pkt(fsp
))
1461 fsp
->recov_retry
= 0;
1462 opcode
= fc_frame_payload_op(fp
);
1463 if (opcode
== ELS_LS_RJT
) {
1464 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1465 switch (rjt
->er_reason
) {
1467 FC_FCP_DBG(fsp
, "device %x unexpected REC reject "
1468 "reason %d expl %d\n",
1469 fsp
->rport
->port_id
, rjt
->er_reason
,
1473 FC_FCP_DBG(fsp
, "device does not support REC\n");
1474 rpriv
= fsp
->rport
->dd_data
;
1476 * if we do not spport RECs or got some bogus
1477 * reason then resetup timer so we check for
1480 rpriv
->flags
&= ~FC_RP_FLAGS_REC_SUPPORTED
;
1485 * If no data transfer, the command frame got dropped
1486 * so we just retry. If data was transferred, we
1487 * lost the response but the target has no record,
1488 * so we abort and retry.
1490 if (rjt
->er_explan
== ELS_EXPL_OXID_RXID
&&
1491 fsp
->xfer_len
== 0) {
1492 fc_fcp_retry_cmd(fsp
);
1495 fc_fcp_recovery(fsp
, FC_ERROR
);
1498 } else if (opcode
== ELS_LS_ACC
) {
1499 if (fsp
->state
& FC_SRB_ABORTED
)
1502 data_dir
= fsp
->cmd
->sc_data_direction
;
1503 recp
= fc_frame_payload_get(fp
, sizeof(*recp
));
1504 offset
= ntohl(recp
->reca_fc4value
);
1505 e_stat
= ntohl(recp
->reca_e_stat
);
1507 if (e_stat
& ESB_ST_COMPLETE
) {
1510 * The exchange is complete.
1512 * For output, we must've lost the response.
1513 * For input, all data must've been sent.
1514 * We lost may have lost the response
1515 * (and a confirmation was requested) and maybe
1518 * If all data received, send SRR
1519 * asking for response. If partial data received,
1520 * or gaps, SRR requests data at start of gap.
1521 * Recovery via SRR relies on in-order-delivery.
1523 if (data_dir
== DMA_TO_DEVICE
) {
1524 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1525 } else if (fsp
->xfer_contig_end
== offset
) {
1526 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1528 offset
= fsp
->xfer_contig_end
;
1529 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1531 fc_fcp_srr(fsp
, r_ctl
, offset
);
1532 } else if (e_stat
& ESB_ST_SEQ_INIT
) {
1534 * The remote port has the initiative, so just
1535 * keep waiting for it to complete.
1537 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1541 * The exchange is incomplete, we have seq. initiative.
1542 * Lost response with requested confirmation,
1543 * lost confirmation, lost transfer ready or
1546 * For output, if not all data was received, ask
1547 * for transfer ready to be repeated.
1549 * If we received or sent all the data, send SRR to
1552 * If we lost a response, we may have lost some read
1555 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1556 if (data_dir
== DMA_TO_DEVICE
) {
1557 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1558 if (offset
< fsp
->data_len
)
1559 r_ctl
= FC_RCTL_DD_DATA_DESC
;
1560 } else if (offset
== fsp
->xfer_contig_end
) {
1561 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1562 } else if (fsp
->xfer_contig_end
< offset
) {
1563 offset
= fsp
->xfer_contig_end
;
1565 fc_fcp_srr(fsp
, r_ctl
, offset
);
1569 fc_fcp_unlock_pkt(fsp
);
1571 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1576 * fc_fcp_rec_error() - Handler for REC errors
1577 * @fsp: The FCP packet the error is on
1578 * @fp: The REC frame
1580 static void fc_fcp_rec_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1582 int error
= PTR_ERR(fp
);
1584 if (fc_fcp_lock_pkt(fsp
))
1589 fc_fcp_retry_cmd(fsp
);
1593 FC_FCP_DBG(fsp
, "REC %p fid %6.6x error unexpected error %d\n",
1594 fsp
, fsp
->rport
->port_id
, error
);
1595 fsp
->status_code
= FC_CMD_PLOGO
;
1598 case -FC_EX_TIMEOUT
:
1600 * Assume REC or LS_ACC was lost.
1601 * The exchange manager will have aborted REC, so retry.
1603 FC_FCP_DBG(fsp
, "REC fid %6.6x error error %d retry %d/%d\n",
1604 fsp
->rport
->port_id
, error
, fsp
->recov_retry
,
1605 FC_MAX_RECOV_RETRY
);
1606 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1609 fc_fcp_recovery(fsp
, FC_ERROR
);
1612 fc_fcp_unlock_pkt(fsp
);
1614 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1618 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1619 * @fsp: The FCP pkt that needs to be aborted
1621 static void fc_fcp_recovery(struct fc_fcp_pkt
*fsp
, u8 code
)
1623 fsp
->status_code
= code
;
1624 fsp
->cdb_status
= 0;
1627 * if this fails then we let the scsi command timer fire and
1630 fc_fcp_send_abort(fsp
);
1634 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1635 * @fsp: The FCP packet the SRR is to be sent on
1636 * @r_ctl: The R_CTL field for the SRR request
1637 * This is called after receiving status but insufficient data, or
1638 * when expecting status but the request has timed out.
1640 static void fc_fcp_srr(struct fc_fcp_pkt
*fsp
, enum fc_rctl r_ctl
, u32 offset
)
1642 struct fc_lport
*lport
= fsp
->lp
;
1643 struct fc_rport
*rport
;
1644 struct fc_rport_libfc_priv
*rpriv
;
1645 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1647 struct fcp_srr
*srr
;
1648 struct fc_frame
*fp
;
1649 unsigned int rec_tov
;
1652 rpriv
= rport
->dd_data
;
1654 if (!(rpriv
->flags
& FC_RP_FLAGS_RETRY
) ||
1655 rpriv
->rp_state
!= RPORT_ST_READY
)
1656 goto retry
; /* shouldn't happen */
1657 fp
= fc_fcp_frame_alloc(lport
, sizeof(*srr
));
1661 srr
= fc_frame_payload_get(fp
, sizeof(*srr
));
1662 memset(srr
, 0, sizeof(*srr
));
1663 srr
->srr_op
= ELS_SRR
;
1664 srr
->srr_ox_id
= htons(ep
->oxid
);
1665 srr
->srr_rx_id
= htons(ep
->rxid
);
1666 srr
->srr_r_ctl
= r_ctl
;
1667 srr
->srr_rel_off
= htonl(offset
);
1669 fc_fill_fc_hdr(fp
, FC_RCTL_ELS4_REQ
, rport
->port_id
,
1670 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1673 rec_tov
= get_fsp_rec_tov(fsp
);
1674 seq
= lport
->tt
.exch_seq_send(lport
, fp
, fc_fcp_srr_resp
,
1676 fsp
, jiffies_to_msecs(rec_tov
));
1680 fsp
->recov_seq
= seq
;
1681 fsp
->xfer_len
= offset
;
1682 fsp
->xfer_contig_end
= offset
;
1683 fsp
->state
&= ~FC_SRB_RCV_STATUS
;
1684 fc_fcp_pkt_hold(fsp
); /* hold for outstanding SRR */
1687 fc_fcp_retry_cmd(fsp
);
1691 * fc_fcp_srr_resp() - Handler for SRR response
1692 * @seq: The sequence the SRR is on
1693 * @fp: The SRR frame
1694 * @arg: The FCP packet the SRR is on
1696 static void fc_fcp_srr_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1698 struct fc_fcp_pkt
*fsp
= arg
;
1699 struct fc_frame_header
*fh
;
1702 fc_fcp_srr_error(fsp
, fp
);
1706 if (fc_fcp_lock_pkt(fsp
))
1709 fh
= fc_frame_header_get(fp
);
1711 * BUG? fc_fcp_srr_error calls exch_done which would release
1712 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1713 * then fc_exch_timeout would be sending an abort. The exch_done
1714 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1715 * an abort response though.
1717 if (fh
->fh_type
== FC_TYPE_BLS
) {
1718 fc_fcp_unlock_pkt(fsp
);
1722 switch (fc_frame_payload_op(fp
)) {
1724 fsp
->recov_retry
= 0;
1725 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1729 fc_fcp_recovery(fsp
, FC_ERROR
);
1732 fc_fcp_unlock_pkt(fsp
);
1734 fsp
->lp
->tt
.exch_done(seq
);
1739 * fc_fcp_srr_error() - Handler for SRR errors
1740 * @fsp: The FCP packet that the SRR error is on
1741 * @fp: The SRR frame
1743 static void fc_fcp_srr_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1745 if (fc_fcp_lock_pkt(fsp
))
1747 switch (PTR_ERR(fp
)) {
1748 case -FC_EX_TIMEOUT
:
1749 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1752 fc_fcp_recovery(fsp
, FC_TIMED_OUT
);
1754 case -FC_EX_CLOSED
: /* e.g., link failure */
1757 fc_fcp_retry_cmd(fsp
);
1760 fc_fcp_unlock_pkt(fsp
);
1762 fsp
->lp
->tt
.exch_done(fsp
->recov_seq
);
1766 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1767 * @lport: The local port to be checked
1769 static inline int fc_fcp_lport_queue_ready(struct fc_lport
*lport
)
1772 return (lport
->state
== LPORT_ST_READY
) &&
1773 lport
->link_up
&& !lport
->qfull
;
1777 * fc_queuecommand() - The queuecommand function of the SCSI template
1778 * @shost: The Scsi_Host that the command was issued to
1779 * @cmd: The scsi_cmnd to be executed
1781 * This is the i/o strategy routine, called by the SCSI layer.
1783 int fc_queuecommand(struct Scsi_Host
*shost
, struct scsi_cmnd
*sc_cmd
)
1785 struct fc_lport
*lport
= shost_priv(shost
);
1786 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1787 struct fc_fcp_pkt
*fsp
;
1788 struct fc_rport_libfc_priv
*rpriv
;
1791 struct fcoe_dev_stats
*stats
;
1793 rval
= fc_remote_port_chkready(rport
);
1795 sc_cmd
->result
= rval
;
1796 sc_cmd
->scsi_done(sc_cmd
);
1800 if (!*(struct fc_remote_port
**)rport
->dd_data
) {
1802 * rport is transitioning from blocked/deleted to
1805 sc_cmd
->result
= DID_IMM_RETRY
<< 16;
1806 sc_cmd
->scsi_done(sc_cmd
);
1810 rpriv
= rport
->dd_data
;
1812 if (!fc_fcp_lport_queue_ready(lport
)) {
1814 fc_fcp_can_queue_ramp_down(lport
);
1815 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1819 fsp
= fc_fcp_pkt_alloc(lport
, GFP_ATOMIC
);
1821 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1826 * build the libfc request pkt
1828 fsp
->cmd
= sc_cmd
; /* save the cmd */
1829 fsp
->rport
= rport
; /* set the remote port ptr */
1832 * set up the transfer length
1834 fsp
->data_len
= scsi_bufflen(sc_cmd
);
1838 * setup the data direction
1840 stats
= per_cpu_ptr(lport
->dev_stats
, get_cpu());
1841 if (sc_cmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
1842 fsp
->req_flags
= FC_SRB_READ
;
1843 stats
->InputRequests
++;
1844 stats
->InputBytes
+= fsp
->data_len
;
1845 } else if (sc_cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1846 fsp
->req_flags
= FC_SRB_WRITE
;
1847 stats
->OutputRequests
++;
1848 stats
->OutputBytes
+= fsp
->data_len
;
1851 stats
->ControlRequests
++;
1855 init_timer(&fsp
->timer
);
1856 fsp
->timer
.data
= (unsigned long)fsp
;
1859 * send it to the lower layer
1860 * if we get -1 return then put the request in the pending
1863 rval
= fc_fcp_pkt_send(lport
, fsp
);
1865 fsp
->state
= FC_SRB_FREE
;
1866 fc_fcp_pkt_release(fsp
);
1867 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1872 EXPORT_SYMBOL(fc_queuecommand
);
1875 * fc_io_compl() - Handle responses for completed commands
1876 * @fsp: The FCP packet that is complete
1878 * Translates fcp_pkt errors to a Linux SCSI errors.
1879 * The fcp packet lock must be held when calling.
1881 static void fc_io_compl(struct fc_fcp_pkt
*fsp
)
1883 struct fc_fcp_internal
*si
;
1884 struct scsi_cmnd
*sc_cmd
;
1885 struct fc_lport
*lport
;
1886 unsigned long flags
;
1888 /* release outstanding ddp context */
1889 fc_fcp_ddp_done(fsp
);
1891 fsp
->state
|= FC_SRB_COMPL
;
1892 if (!(fsp
->state
& FC_SRB_FCP_PROCESSING_TMO
)) {
1893 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1894 del_timer_sync(&fsp
->timer
);
1895 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1899 si
= fc_get_scsi_internal(lport
);
1902 * if can_queue ramp down is done then try can_queue ramp up
1903 * since commands are completing now.
1905 if (si
->last_can_queue_ramp_down_time
)
1906 fc_fcp_can_queue_ramp_up(lport
);
1909 CMD_SCSI_STATUS(sc_cmd
) = fsp
->cdb_status
;
1910 switch (fsp
->status_code
) {
1912 if (fsp
->cdb_status
== 0) {
1916 sc_cmd
->result
= DID_OK
<< 16;
1917 if (fsp
->scsi_resid
)
1918 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1921 * transport level I/O was ok but scsi
1922 * has non zero status
1924 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
1928 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1929 "due to FC_ERROR\n");
1930 sc_cmd
->result
= DID_ERROR
<< 16;
1932 case FC_DATA_UNDRUN
:
1933 if ((fsp
->cdb_status
== 0) && !(fsp
->req_flags
& FC_SRB_READ
)) {
1935 * scsi status is good but transport level
1938 if (fsp
->state
& FC_SRB_RCV_STATUS
) {
1939 sc_cmd
->result
= DID_OK
<< 16;
1941 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml"
1942 " due to FC_DATA_UNDRUN (trans)\n");
1943 sc_cmd
->result
= DID_ERROR
<< 16;
1947 * scsi got underrun, this is an error
1949 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1950 "due to FC_DATA_UNDRUN (scsi)\n");
1951 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
1952 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1955 case FC_DATA_OVRRUN
:
1957 * overrun is an error
1959 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1960 "due to FC_DATA_OVRRUN\n");
1961 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
1963 case FC_CMD_ABORTED
:
1964 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1965 "due to FC_CMD_ABORTED\n");
1966 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->io_status
;
1969 FC_FCP_DBG(fsp
, "Returning DID_RESET to scsi-ml "
1970 "due to FC_CMD_RESET\n");
1971 sc_cmd
->result
= (DID_RESET
<< 16);
1974 FC_FCP_DBG(fsp
, "Returning DID_NO_CONNECT to scsi-ml "
1975 "due to FC_HRD_ERROR\n");
1976 sc_cmd
->result
= (DID_NO_CONNECT
<< 16);
1979 FC_FCP_DBG(fsp
, "Returning DID_PARITY to scsi-ml "
1980 "due to FC_CRC_ERROR\n");
1981 sc_cmd
->result
= (DID_PARITY
<< 16);
1984 FC_FCP_DBG(fsp
, "Returning DID_BUS_BUSY to scsi-ml "
1985 "due to FC_TIMED_OUT\n");
1986 sc_cmd
->result
= (DID_BUS_BUSY
<< 16) | fsp
->io_status
;
1989 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
1990 "due to unknown error\n");
1991 sc_cmd
->result
= (DID_ERROR
<< 16);
1995 if (lport
->state
!= LPORT_ST_READY
&& fsp
->status_code
!= FC_COMPLETE
)
1996 sc_cmd
->result
= (DID_TRANSPORT_DISRUPTED
<< 16);
1998 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1999 list_del(&fsp
->list
);
2000 sc_cmd
->SCp
.ptr
= NULL
;
2001 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
2002 sc_cmd
->scsi_done(sc_cmd
);
2004 /* release ref from initial allocation in queue command */
2005 fc_fcp_pkt_release(fsp
);
2009 * fc_eh_abort() - Abort a command
2010 * @sc_cmd: The SCSI command to abort
2012 * From SCSI host template.
2013 * Send an ABTS to the target device and wait for the response.
2015 int fc_eh_abort(struct scsi_cmnd
*sc_cmd
)
2017 struct fc_fcp_pkt
*fsp
;
2018 struct fc_lport
*lport
;
2019 struct fc_fcp_internal
*si
;
2021 unsigned long flags
;
2023 lport
= shost_priv(sc_cmd
->device
->host
);
2024 if (lport
->state
!= LPORT_ST_READY
)
2026 else if (!lport
->link_up
)
2029 si
= fc_get_scsi_internal(lport
);
2030 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
2031 fsp
= CMD_SP(sc_cmd
);
2033 /* command completed while scsi eh was setting up */
2034 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
2037 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2038 fc_fcp_pkt_hold(fsp
);
2039 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
2041 if (fc_fcp_lock_pkt(fsp
)) {
2042 /* completed while we were waiting for timer to be deleted */
2047 rc
= fc_fcp_pkt_abort(fsp
);
2048 fc_fcp_unlock_pkt(fsp
);
2051 fc_fcp_pkt_release(fsp
);
2054 EXPORT_SYMBOL(fc_eh_abort
);
2057 * fc_eh_device_reset() - Reset a single LUN
2058 * @sc_cmd: The SCSI command which identifies the device whose
2059 * LUN is to be reset
2061 * Set from SCSI host template.
2063 int fc_eh_device_reset(struct scsi_cmnd
*sc_cmd
)
2065 struct fc_lport
*lport
;
2066 struct fc_fcp_pkt
*fsp
;
2067 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
2071 rval
= fc_remote_port_chkready(rport
);
2075 lport
= shost_priv(sc_cmd
->device
->host
);
2077 if (lport
->state
!= LPORT_ST_READY
)
2080 FC_SCSI_DBG(lport
, "Resetting rport (%6.6x)\n", rport
->port_id
);
2082 fsp
= fc_fcp_pkt_alloc(lport
, GFP_NOIO
);
2084 printk(KERN_WARNING
"libfc: could not allocate scsi_pkt\n");
2089 * Build the libfc request pkt. Do not set the scsi cmnd, because
2090 * the sc passed in is not setup for execution like when sent
2091 * through the queuecommand callout.
2093 fsp
->rport
= rport
; /* set the remote port ptr */
2096 * flush outstanding commands
2098 rc
= fc_lun_reset(lport
, fsp
, scmd_id(sc_cmd
), sc_cmd
->device
->lun
);
2099 fsp
->state
= FC_SRB_FREE
;
2100 fc_fcp_pkt_release(fsp
);
2105 EXPORT_SYMBOL(fc_eh_device_reset
);
2108 * fc_eh_host_reset() - Reset a Scsi_Host.
2109 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2111 int fc_eh_host_reset(struct scsi_cmnd
*sc_cmd
)
2113 struct Scsi_Host
*shost
= sc_cmd
->device
->host
;
2114 struct fc_lport
*lport
= shost_priv(shost
);
2115 unsigned long wait_tmo
;
2117 FC_SCSI_DBG(lport
, "Resetting host\n");
2119 lport
->tt
.lport_reset(lport
);
2120 wait_tmo
= jiffies
+ FC_HOST_RESET_TIMEOUT
;
2121 while (!fc_fcp_lport_queue_ready(lport
) && time_before(jiffies
,
2125 if (fc_fcp_lport_queue_ready(lport
)) {
2126 shost_printk(KERN_INFO
, shost
, "libfc: Host reset succeeded "
2127 "on port (%6.6x)\n", lport
->port_id
);
2130 shost_printk(KERN_INFO
, shost
, "libfc: Host reset failed, "
2131 "port (%6.6x) is not ready.\n",
2136 EXPORT_SYMBOL(fc_eh_host_reset
);
2139 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2140 * @sdev: The SCSI device that identifies the SCSI host
2142 * Configures queue depth based on host's cmd_per_len. If not set
2143 * then we use the libfc default.
2145 int fc_slave_alloc(struct scsi_device
*sdev
)
2147 struct fc_rport
*rport
= starget_to_rport(scsi_target(sdev
));
2149 if (!rport
|| fc_remote_port_chkready(rport
))
2152 if (sdev
->tagged_supported
)
2153 scsi_activate_tcq(sdev
, FC_FCP_DFLT_QUEUE_DEPTH
);
2155 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
),
2156 FC_FCP_DFLT_QUEUE_DEPTH
);
2160 EXPORT_SYMBOL(fc_slave_alloc
);
2163 * fc_change_queue_depth() - Change a device's queue depth
2164 * @sdev: The SCSI device whose queue depth is to change
2165 * @qdepth: The new queue depth
2166 * @reason: The resason for the change
2168 int fc_change_queue_depth(struct scsi_device
*sdev
, int qdepth
, int reason
)
2171 case SCSI_QDEPTH_DEFAULT
:
2172 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2174 case SCSI_QDEPTH_QFULL
:
2175 scsi_track_queue_full(sdev
, qdepth
);
2177 case SCSI_QDEPTH_RAMP_UP
:
2178 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2183 return sdev
->queue_depth
;
2185 EXPORT_SYMBOL(fc_change_queue_depth
);
2188 * fc_change_queue_type() - Change a device's queue type
2189 * @sdev: The SCSI device whose queue depth is to change
2190 * @tag_type: Identifier for queue type
2192 int fc_change_queue_type(struct scsi_device
*sdev
, int tag_type
)
2194 if (sdev
->tagged_supported
) {
2195 scsi_set_tag_type(sdev
, tag_type
);
2197 scsi_activate_tcq(sdev
, sdev
->queue_depth
);
2199 scsi_deactivate_tcq(sdev
, sdev
->queue_depth
);
2205 EXPORT_SYMBOL(fc_change_queue_type
);
2208 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2209 * @lport: The local port that no longer needs the FCP layer
2211 void fc_fcp_destroy(struct fc_lport
*lport
)
2213 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
2215 if (!list_empty(&si
->scsi_pkt_queue
))
2216 printk(KERN_ERR
"libfc: Leaked SCSI packets when destroying "
2217 "port (%6.6x)\n", lport
->port_id
);
2219 mempool_destroy(si
->scsi_pkt_pool
);
2221 lport
->scsi_priv
= NULL
;
2223 EXPORT_SYMBOL(fc_fcp_destroy
);
2225 int fc_setup_fcp(void)
2229 scsi_pkt_cachep
= kmem_cache_create("libfc_fcp_pkt",
2230 sizeof(struct fc_fcp_pkt
),
2231 0, SLAB_HWCACHE_ALIGN
, NULL
);
2232 if (!scsi_pkt_cachep
) {
2233 printk(KERN_ERR
"libfc: Unable to allocate SRB cache, "
2234 "module load failed!");
2241 void fc_destroy_fcp(void)
2243 if (scsi_pkt_cachep
)
2244 kmem_cache_destroy(scsi_pkt_cachep
);
2248 * fc_fcp_init() - Initialize the FCP layer for a local port
2249 * @lport: The local port to initialize the exchange layer for
2251 int fc_fcp_init(struct fc_lport
*lport
)
2254 struct fc_fcp_internal
*si
;
2256 if (!lport
->tt
.fcp_cmd_send
)
2257 lport
->tt
.fcp_cmd_send
= fc_fcp_cmd_send
;
2259 if (!lport
->tt
.fcp_cleanup
)
2260 lport
->tt
.fcp_cleanup
= fc_fcp_cleanup
;
2262 if (!lport
->tt
.fcp_abort_io
)
2263 lport
->tt
.fcp_abort_io
= fc_fcp_abort_io
;
2265 si
= kzalloc(sizeof(struct fc_fcp_internal
), GFP_KERNEL
);
2268 lport
->scsi_priv
= si
;
2269 si
->max_can_queue
= lport
->host
->can_queue
;
2270 INIT_LIST_HEAD(&si
->scsi_pkt_queue
);
2271 spin_lock_init(&si
->scsi_queue_lock
);
2273 si
->scsi_pkt_pool
= mempool_create_slab_pool(2, scsi_pkt_cachep
);
2274 if (!si
->scsi_pkt_pool
) {
2284 EXPORT_SYMBOL(fc_fcp_init
);