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
125 #define FC_TRANS_RESET 12
128 * Error recovery timeout values.
130 #define FC_SCSI_TM_TOV (10 * HZ)
131 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
132 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
134 #define FC_MAX_ERROR_CNT 5
135 #define FC_MAX_RECOV_RETRY 3
137 #define FC_FCP_DFLT_QUEUE_DEPTH 32
140 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
141 * @lport: The local port that the FCP packet is for
142 * @gfp: GFP flags for allocation
144 * Return value: fcp_pkt structure or null on allocation failure.
145 * Context: Can be called from process context, no lock is required.
147 static struct fc_fcp_pkt
*fc_fcp_pkt_alloc(struct fc_lport
*lport
, gfp_t gfp
)
149 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
150 struct fc_fcp_pkt
*fsp
;
152 fsp
= mempool_alloc(si
->scsi_pkt_pool
, gfp
);
154 memset(fsp
, 0, sizeof(*fsp
));
156 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
157 refcount_set(&fsp
->ref_cnt
, 1);
158 init_timer(&fsp
->timer
);
159 fsp
->timer
.data
= (unsigned long)fsp
;
160 INIT_LIST_HEAD(&fsp
->list
);
161 spin_lock_init(&fsp
->scsi_pkt_lock
);
163 per_cpu_ptr(lport
->stats
, get_cpu())->FcpPktAllocFails
++;
170 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
171 * @fsp: The FCP packet to be released
173 * Context: Can be called from process or interrupt context,
174 * no lock is required.
176 static void fc_fcp_pkt_release(struct fc_fcp_pkt
*fsp
)
178 if (refcount_dec_and_test(&fsp
->ref_cnt
)) {
179 struct fc_fcp_internal
*si
= fc_get_scsi_internal(fsp
->lp
);
181 mempool_free(fsp
, si
->scsi_pkt_pool
);
186 * fc_fcp_pkt_hold() - Hold a fcp_pkt
187 * @fsp: The FCP packet to be held
189 static void fc_fcp_pkt_hold(struct fc_fcp_pkt
*fsp
)
191 refcount_inc(&fsp
->ref_cnt
);
195 * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt
196 * @seq: The sequence that the FCP packet is on (required by destructor API)
197 * @fsp: The FCP packet to be released
199 * This routine is called by a destructor callback in the fc_exch_seq_send()
200 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
201 * argument even though it is not used by this routine.
203 * Context: No locking required.
205 static void fc_fcp_pkt_destroy(struct fc_seq
*seq
, void *fsp
)
207 fc_fcp_pkt_release(fsp
);
211 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
212 * @fsp: The FCP packet to be locked and incremented
214 * We should only return error if we return a command to SCSI-ml before
215 * getting a response. This can happen in cases where we send a abort, but
216 * do not wait for the response and the abort and command can be passing
217 * each other on the wire/network-layer.
219 * Note: this function locks the packet and gets a reference to allow
220 * callers to call the completion function while the lock is held and
221 * not have to worry about the packets refcount.
223 * TODO: Maybe we should just have callers grab/release the lock and
224 * have a function that they call to verify the fsp and grab a ref if
227 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt
*fsp
)
229 spin_lock_bh(&fsp
->scsi_pkt_lock
);
230 if (fsp
->state
& FC_SRB_COMPL
) {
231 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
235 fc_fcp_pkt_hold(fsp
);
240 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
242 * @fsp: The FCP packet to be unlocked and decremented
244 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt
*fsp
)
246 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
247 fc_fcp_pkt_release(fsp
);
251 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
252 * @fsp: The FCP packet to start a timer for
253 * @delay: The timeout period in jiffies
255 static void fc_fcp_timer_set(struct fc_fcp_pkt
*fsp
, unsigned long delay
)
257 if (!(fsp
->state
& FC_SRB_COMPL
)) {
258 mod_timer(&fsp
->timer
, jiffies
+ delay
);
259 fsp
->timer_delay
= delay
;
263 static void fc_fcp_abort_done(struct fc_fcp_pkt
*fsp
)
265 fsp
->state
|= FC_SRB_ABORTED
;
266 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
268 if (fsp
->wait_for_comp
)
269 complete(&fsp
->tm_done
);
271 fc_fcp_complete_locked(fsp
);
275 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
277 * @fsp: The FCP packet to abort exchanges on
279 static int fc_fcp_send_abort(struct fc_fcp_pkt
*fsp
)
286 per_cpu_ptr(fsp
->lp
->stats
, get_cpu())->FcpPktAborts
++;
289 fsp
->state
|= FC_SRB_ABORT_PENDING
;
290 rc
= fc_seq_exch_abort(fsp
->seq_ptr
, 0);
292 * fc_seq_exch_abort() might return -ENXIO if
293 * the sequence is already completed
296 fc_fcp_abort_done(fsp
);
303 * fc_fcp_retry_cmd() - Retry a fcp_pkt
304 * @fsp: The FCP packet to be retried
306 * Sets the status code to be FC_ERROR and then calls
307 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
308 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
309 * The SCSI-ml will retry the command.
311 static void fc_fcp_retry_cmd(struct fc_fcp_pkt
*fsp
, int status_code
)
314 fc_exch_done(fsp
->seq_ptr
);
318 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
320 fsp
->status_code
= status_code
;
321 fc_fcp_complete_locked(fsp
);
325 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
326 * @fsp: The FCP packet that will manage the DDP frames
327 * @xid: The XID that will be used for the DDP exchange
329 void fc_fcp_ddp_setup(struct fc_fcp_pkt
*fsp
, u16 xid
)
331 struct fc_lport
*lport
;
334 if ((fsp
->req_flags
& FC_SRB_READ
) &&
335 (lport
->lro_enabled
) && (lport
->tt
.ddp_setup
)) {
336 if (lport
->tt
.ddp_setup(lport
, xid
, scsi_sglist(fsp
->cmd
),
337 scsi_sg_count(fsp
->cmd
)))
343 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
344 * DDP related resources for a fcp_pkt
345 * @fsp: The FCP packet that DDP had been used on
347 void fc_fcp_ddp_done(struct fc_fcp_pkt
*fsp
)
349 struct fc_lport
*lport
;
354 if (fsp
->xfer_ddp
== FC_XID_UNKNOWN
)
358 if (lport
->tt
.ddp_done
) {
359 fsp
->xfer_len
= lport
->tt
.ddp_done(lport
, fsp
->xfer_ddp
);
360 fsp
->xfer_ddp
= FC_XID_UNKNOWN
;
365 * fc_fcp_can_queue_ramp_up() - increases can_queue
366 * @lport: lport to ramp up can_queue
368 static void fc_fcp_can_queue_ramp_up(struct fc_lport
*lport
)
370 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
374 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
376 if (si
->last_can_queue_ramp_up_time
&&
377 (time_before(jiffies
, si
->last_can_queue_ramp_up_time
+
378 FC_CAN_QUEUE_PERIOD
)))
381 if (time_before(jiffies
, si
->last_can_queue_ramp_down_time
+
382 FC_CAN_QUEUE_PERIOD
))
385 si
->last_can_queue_ramp_up_time
= jiffies
;
387 can_queue
= lport
->host
->can_queue
<< 1;
388 if (can_queue
>= si
->max_can_queue
) {
389 can_queue
= si
->max_can_queue
;
390 si
->last_can_queue_ramp_down_time
= 0;
392 lport
->host
->can_queue
= can_queue
;
393 shost_printk(KERN_ERR
, lport
->host
, "libfc: increased "
394 "can_queue to %d.\n", can_queue
);
397 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
401 * fc_fcp_can_queue_ramp_down() - reduces can_queue
402 * @lport: lport to reduce can_queue
404 * If we are getting memory allocation failures, then we may
405 * be trying to execute too many commands. We let the running
406 * commands complete or timeout, then try again with a reduced
407 * can_queue. Eventually we will hit the point where we run
408 * on all reserved structs.
410 static bool fc_fcp_can_queue_ramp_down(struct fc_lport
*lport
)
412 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
415 bool changed
= false;
417 spin_lock_irqsave(lport
->host
->host_lock
, flags
);
419 if (si
->last_can_queue_ramp_down_time
&&
420 (time_before(jiffies
, si
->last_can_queue_ramp_down_time
+
421 FC_CAN_QUEUE_PERIOD
)))
424 si
->last_can_queue_ramp_down_time
= jiffies
;
426 can_queue
= lport
->host
->can_queue
;
430 lport
->host
->can_queue
= can_queue
;
434 spin_unlock_irqrestore(lport
->host
->host_lock
, flags
);
439 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
440 * @lport: fc lport struct
441 * @len: payload length
443 * Allocates fc_frame structure and buffer but if fails to allocate
444 * then reduce can_queue.
446 static inline struct fc_frame
*fc_fcp_frame_alloc(struct fc_lport
*lport
,
451 fp
= fc_frame_alloc(lport
, len
);
455 per_cpu_ptr(lport
->stats
, get_cpu())->FcpFrameAllocFails
++;
458 fc_fcp_can_queue_ramp_down(lport
);
459 shost_printk(KERN_ERR
, lport
->host
,
460 "libfc: Could not allocate frame, "
461 "reducing can_queue to %d.\n", lport
->host
->can_queue
);
466 * get_fsp_rec_tov() - Helper function to get REC_TOV
467 * @fsp: the FCP packet
469 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
471 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt
*fsp
)
473 struct fc_rport_libfc_priv
*rpriv
= fsp
->rport
->dd_data
;
474 unsigned int e_d_tov
= FC_DEF_E_D_TOV
;
476 if (rpriv
&& rpriv
->e_d_tov
> e_d_tov
)
477 e_d_tov
= rpriv
->e_d_tov
;
478 return msecs_to_jiffies(e_d_tov
) + HZ
;
482 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
483 * @fsp: The FCP packet the data is on
484 * @fp: The data frame
486 static void fc_fcp_recv_data(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
488 struct scsi_cmnd
*sc
= fsp
->cmd
;
489 struct fc_lport
*lport
= fsp
->lp
;
490 struct fc_stats
*stats
;
491 struct fc_frame_header
*fh
;
498 struct scatterlist
*sg
;
500 u8 host_bcode
= FC_COMPLETE
;
502 fh
= fc_frame_header_get(fp
);
503 offset
= ntohl(fh
->fh_parm_offset
);
504 start_offset
= offset
;
505 len
= fr_len(fp
) - sizeof(*fh
);
506 buf
= fc_frame_payload_get(fp
, 0);
509 * if this I/O is ddped then clear it and initiate recovery since data
510 * frames are expected to be placed directly in that case.
512 * Indicate error to scsi-ml because something went wrong with the
513 * ddp handling to get us here.
515 if (fsp
->xfer_ddp
!= FC_XID_UNKNOWN
) {
516 fc_fcp_ddp_done(fsp
);
517 FC_FCP_DBG(fsp
, "DDP I/O in fc_fcp_recv_data set ERROR\n");
518 host_bcode
= FC_ERROR
;
521 if (offset
+ len
> fsp
->data_len
) {
522 /* this should never happen */
523 if ((fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) &&
524 fc_frame_crc_check(fp
))
526 FC_FCP_DBG(fsp
, "data received past end. len %zx offset %zx "
527 "data_len %x\n", len
, offset
, fsp
->data_len
);
529 /* Data is corrupted indicate scsi-ml should retry */
530 host_bcode
= FC_DATA_OVRRUN
;
533 if (offset
!= fsp
->xfer_len
)
534 fsp
->state
|= FC_SRB_DISCONTIG
;
536 sg
= scsi_sglist(sc
);
537 nents
= scsi_sg_count(sc
);
539 if (!(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
)) {
540 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
543 crc
= crc32(~0, (u8
*) fh
, sizeof(*fh
));
544 copy_len
= fc_copy_buffer_to_sglist(buf
, len
, sg
, &nents
,
546 buf
= fc_frame_payload_get(fp
, 0);
548 crc
= crc32(crc
, buf
+ len
, 4 - (len
% 4));
550 if (~crc
!= le32_to_cpu(fr_crc(fp
))) {
552 stats
= per_cpu_ptr(lport
->stats
, get_cpu());
553 stats
->ErrorFrames
++;
554 /* per cpu count, not total count, but OK for limit */
555 if (stats
->InvalidCRCCount
++ < FC_MAX_ERROR_CNT
)
556 printk(KERN_WARNING
"libfc: CRC error on data "
557 "frame for port (%6.6x)\n",
561 * Assume the frame is total garbage.
562 * We may have copied it over the good part
564 * If so, we need to retry the entire operation.
565 * Otherwise, ignore it.
567 if (fsp
->state
& FC_SRB_DISCONTIG
) {
568 host_bcode
= FC_CRC_ERROR
;
575 if (fsp
->xfer_contig_end
== start_offset
)
576 fsp
->xfer_contig_end
+= copy_len
;
577 fsp
->xfer_len
+= copy_len
;
580 * In the very rare event that this data arrived after the response
581 * and completes the transfer, call the completion handler.
583 if (unlikely(fsp
->state
& FC_SRB_RCV_STATUS
) &&
584 fsp
->xfer_len
== fsp
->data_len
- fsp
->scsi_resid
) {
585 FC_FCP_DBG( fsp
, "complete out-of-order sequence\n" );
586 fc_fcp_complete_locked(fsp
);
590 fc_fcp_recovery(fsp
, host_bcode
);
594 * fc_fcp_send_data() - Send SCSI data to a target
595 * @fsp: The FCP packet the data is on
596 * @sp: The sequence the data is to be sent on
597 * @offset: The starting offset for this data request
598 * @seq_blen: The burst length for this data request
600 * Called after receiving a Transfer Ready data descriptor.
601 * If the LLD is capable of sequence offload then send down the
602 * seq_blen amount of data in single frame, otherwise send
603 * multiple frames of the maximum frame payload supported by
606 static int fc_fcp_send_data(struct fc_fcp_pkt
*fsp
, struct fc_seq
*seq
,
607 size_t offset
, size_t seq_blen
)
610 struct scsi_cmnd
*sc
;
611 struct scatterlist
*sg
;
612 struct fc_frame
*fp
= NULL
;
613 struct fc_lport
*lport
= fsp
->lp
;
619 size_t frame_offset
, fh_parm_offset
;
624 int using_sg
= lport
->sg_supp
;
627 WARN_ON(seq_blen
<= 0);
628 if (unlikely(offset
+ seq_blen
> fsp
->data_len
)) {
629 /* this should never happen */
630 FC_FCP_DBG(fsp
, "xfer-ready past end. seq_blen %zx "
631 "offset %zx\n", seq_blen
, offset
);
632 fc_fcp_send_abort(fsp
);
634 } else if (offset
!= fsp
->xfer_len
) {
635 /* Out of Order Data Request - no problem, but unexpected. */
636 FC_FCP_DBG(fsp
, "xfer-ready non-contiguous. "
637 "seq_blen %zx offset %zx\n", seq_blen
, offset
);
641 * if LLD is capable of seq_offload then set transport
642 * burst length (t_blen) to seq_blen, otherwise set t_blen
643 * to max FC frame payload previously set in fsp->max_payload.
645 t_blen
= fsp
->max_payload
;
646 if (lport
->seq_offload
) {
647 t_blen
= min(seq_blen
, (size_t)lport
->lso_max
);
648 FC_FCP_DBG(fsp
, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
649 fsp
, seq_blen
, lport
->lso_max
, t_blen
);
653 t_blen
&= ~(512 - 1); /* round down to block size */
656 remaining
= seq_blen
;
657 fh_parm_offset
= frame_offset
= offset
;
659 seq
= fc_seq_start_next(seq
);
660 f_ctl
= FC_FC_REL_OFF
;
663 sg
= scsi_sglist(sc
);
665 while (remaining
> 0 && sg
) {
666 if (offset
>= sg
->length
) {
667 offset
-= sg
->length
;
672 tlen
= min(t_blen
, remaining
);
675 * TODO. Temporary workaround. fc_seq_send() can't
676 * handle odd lengths in non-linear skbs.
677 * This will be the final fragment only.
681 fp
= fc_frame_alloc(lport
, using_sg
? 0 : tlen
);
685 data
= fc_frame_header_get(fp
) + 1;
686 fh_parm_offset
= frame_offset
;
687 fr_max_payload(fp
) = fsp
->max_payload
;
690 off
= offset
+ sg
->offset
;
691 sg_bytes
= min(tlen
, sg
->length
- offset
);
692 sg_bytes
= min(sg_bytes
,
693 (size_t) (PAGE_SIZE
- (off
& ~PAGE_MASK
)));
694 page
= sg_page(sg
) + (off
>> PAGE_SHIFT
);
697 skb_fill_page_desc(fp_skb(fp
),
698 skb_shinfo(fp_skb(fp
))->nr_frags
,
699 page
, off
& ~PAGE_MASK
, sg_bytes
);
700 fp_skb(fp
)->data_len
+= sg_bytes
;
701 fr_len(fp
) += sg_bytes
;
702 fp_skb(fp
)->truesize
+= PAGE_SIZE
;
705 * The scatterlist item may be bigger than PAGE_SIZE,
706 * but we must not cross pages inside the kmap.
708 page_addr
= kmap_atomic(page
);
709 memcpy(data
, (char *)page_addr
+ (off
& ~PAGE_MASK
),
711 kunmap_atomic(page_addr
);
715 frame_offset
+= sg_bytes
;
717 remaining
-= sg_bytes
;
719 if ((skb_shinfo(fp_skb(fp
))->nr_frags
< FC_FRAME_SG_LEN
) &&
724 * Send sequence with transfer sequence initiative in case
725 * this is last FCP frame of the sequence.
728 f_ctl
|= FC_FC_SEQ_INIT
| FC_FC_END_SEQ
;
730 ep
= fc_seq_exch(seq
);
731 fc_fill_fc_hdr(fp
, FC_RCTL_DD_SOL_DATA
, ep
->did
, ep
->sid
,
732 FC_TYPE_FCP
, f_ctl
, fh_parm_offset
);
735 * send fragment using for a sequence.
737 error
= fc_seq_send(lport
, seq
, fp
);
739 WARN_ON(1); /* send error should be rare */
744 fsp
->xfer_len
+= seq_blen
; /* premature count? */
749 * fc_fcp_abts_resp() - Receive an ABTS response
750 * @fsp: The FCP packet that is being aborted
751 * @fp: The response frame
753 static void fc_fcp_abts_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
756 struct fc_ba_rjt
*brp
;
757 struct fc_frame_header
*fh
;
759 fh
= fc_frame_header_get(fp
);
760 switch (fh
->fh_r_ctl
) {
764 brp
= fc_frame_payload_get(fp
, sizeof(*brp
));
765 if (brp
&& brp
->br_reason
== FC_BA_RJT_LOG_ERR
)
770 * we will let the command timeout
771 * and scsi-ml recover in this case,
772 * therefore cleared the ba_done flag.
778 fc_fcp_abort_done(fsp
);
782 * fc_fcp_recv() - Receive an FCP frame
783 * @seq: The sequence the frame is on
784 * @fp: The received frame
785 * @arg: The related FCP packet
787 * Context: Called from Soft IRQ context. Can not be called
788 * holding the FCP packet list lock.
790 static void fc_fcp_recv(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
792 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
793 struct fc_lport
*lport
= fsp
->lp
;
794 struct fc_frame_header
*fh
;
795 struct fcp_txrdy
*dd
;
800 fc_fcp_error(fsp
, fp
);
804 fh
= fc_frame_header_get(fp
);
805 r_ctl
= fh
->fh_r_ctl
;
807 if (lport
->state
!= LPORT_ST_READY
) {
808 FC_FCP_DBG(fsp
, "lport state %d, ignoring r_ctl %x\n",
809 lport
->state
, r_ctl
);
812 if (fc_fcp_lock_pkt(fsp
))
815 if (fh
->fh_type
== FC_TYPE_BLS
) {
816 fc_fcp_abts_resp(fsp
, fp
);
820 if (fsp
->state
& (FC_SRB_ABORTED
| FC_SRB_ABORT_PENDING
)) {
821 FC_FCP_DBG(fsp
, "command aborted, ignoring r_ctl %x\n", r_ctl
);
825 if (r_ctl
== FC_RCTL_DD_DATA_DESC
) {
827 * received XFER RDY from the target
828 * need to send data to the target
830 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
831 dd
= fc_frame_payload_get(fp
, sizeof(*dd
));
834 rc
= fc_fcp_send_data(fsp
, seq
,
835 (size_t) ntohl(dd
->ft_data_ro
),
836 (size_t) ntohl(dd
->ft_burst_len
));
838 seq
->rec_data
= fsp
->xfer_len
;
839 } else if (r_ctl
== FC_RCTL_DD_SOL_DATA
) {
841 * received a DATA frame
842 * next we will copy the data to the system buffer
844 WARN_ON(fr_len(fp
) < sizeof(*fh
)); /* len may be 0 */
845 fc_fcp_recv_data(fsp
, fp
);
846 seq
->rec_data
= fsp
->xfer_contig_end
;
847 } else if (r_ctl
== FC_RCTL_DD_CMD_STATUS
) {
848 WARN_ON(fr_flags(fp
) & FCPHF_CRC_UNCHECKED
);
850 fc_fcp_resp(fsp
, fp
);
852 FC_FCP_DBG(fsp
, "unexpected frame. r_ctl %x\n", r_ctl
);
855 fc_fcp_unlock_pkt(fsp
);
861 * fc_fcp_resp() - Handler for FCP responses
862 * @fsp: The FCP packet the response is for
863 * @fp: The response frame
865 static void fc_fcp_resp(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
867 struct fc_frame_header
*fh
;
868 struct fcp_resp
*fc_rp
;
869 struct fcp_resp_ext
*rp_ex
;
870 struct fcp_resp_rsp_info
*fc_rp_info
;
878 fh
= (struct fc_frame_header
*)fr_hdr(fp
);
879 if (unlikely(plen
< sizeof(*fh
) + sizeof(*fc_rp
)))
882 fc_rp
= (struct fcp_resp
*)(fh
+ 1);
883 fsp
->cdb_status
= fc_rp
->fr_status
;
884 flags
= fc_rp
->fr_flags
;
885 fsp
->scsi_comp_flags
= flags
;
886 expected_len
= fsp
->data_len
;
888 /* if ddp, update xfer len */
889 fc_fcp_ddp_done(fsp
);
891 if (unlikely((flags
& ~FCP_CONF_REQ
) || fc_rp
->fr_status
)) {
892 rp_ex
= (void *)(fc_rp
+ 1);
893 if (flags
& (FCP_RSP_LEN_VAL
| FCP_SNS_LEN_VAL
)) {
894 if (plen
< sizeof(*fc_rp
) + sizeof(*rp_ex
))
896 fc_rp_info
= (struct fcp_resp_rsp_info
*)(rp_ex
+ 1);
897 if (flags
& FCP_RSP_LEN_VAL
) {
898 respl
= ntohl(rp_ex
->fr_rsp_len
);
899 if ((respl
!= FCP_RESP_RSP_INFO_LEN4
) &&
900 (respl
!= FCP_RESP_RSP_INFO_LEN8
))
902 if (fsp
->wait_for_comp
) {
903 /* Abuse cdb_status for rsp code */
904 fsp
->cdb_status
= fc_rp_info
->rsp_code
;
905 complete(&fsp
->tm_done
);
907 * tmfs will not have any scsi cmd so
913 if (flags
& FCP_SNS_LEN_VAL
) {
914 snsl
= ntohl(rp_ex
->fr_sns_len
);
915 if (snsl
> SCSI_SENSE_BUFFERSIZE
)
916 snsl
= SCSI_SENSE_BUFFERSIZE
;
917 memcpy(fsp
->cmd
->sense_buffer
,
918 (char *)fc_rp_info
+ respl
, snsl
);
921 if (flags
& (FCP_RESID_UNDER
| FCP_RESID_OVER
)) {
922 if (plen
< sizeof(*fc_rp
) + sizeof(rp_ex
->fr_resid
))
924 if (flags
& FCP_RESID_UNDER
) {
925 fsp
->scsi_resid
= ntohl(rp_ex
->fr_resid
);
927 * The cmnd->underflow is the minimum number of
928 * bytes that must be transferred for this
929 * command. Provided a sense condition is not
930 * present, make sure the actual amount
931 * transferred is at least the underflow value
934 if (!(flags
& FCP_SNS_LEN_VAL
) &&
935 (fc_rp
->fr_status
== 0) &&
936 (scsi_bufflen(fsp
->cmd
) -
937 fsp
->scsi_resid
) < fsp
->cmd
->underflow
)
939 expected_len
-= fsp
->scsi_resid
;
941 fsp
->status_code
= FC_ERROR
;
945 fsp
->state
|= FC_SRB_RCV_STATUS
;
948 * Check for missing or extra data frames.
950 if (unlikely(fsp
->cdb_status
== SAM_STAT_GOOD
&&
951 fsp
->xfer_len
!= expected_len
)) {
952 if (fsp
->xfer_len
< expected_len
) {
954 * Some data may be queued locally,
955 * Wait a at least one jiffy to see if it is delivered.
956 * If this expires without data, we may do SRR.
958 if (fsp
->lp
->qfull
) {
959 FC_FCP_DBG(fsp
, "tgt %6.6x queue busy retry\n",
960 fsp
->rport
->port_id
);
963 FC_FCP_DBG(fsp
, "tgt %6.6x xfer len %zx data underrun "
964 "len %x, data len %x\n",
966 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
967 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
970 fsp
->status_code
= FC_DATA_OVRRUN
;
971 FC_FCP_DBG(fsp
, "tgt %6.6x xfer len %zx greater than expected, "
972 "len %x, data len %x\n",
974 fsp
->xfer_len
, expected_len
, fsp
->data_len
);
976 fc_fcp_complete_locked(fsp
);
980 FC_FCP_DBG(fsp
, "short FCP response. flags 0x%x len %u respl %u "
981 "snsl %u\n", flags
, fr_len(fp
), respl
, snsl
);
983 fsp
->status_code
= FC_ERROR
;
984 fc_fcp_complete_locked(fsp
);
988 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
990 * @fsp: The FCP packet to be completed
992 * This function may sleep if a timer is pending. The packet lock must be
993 * held, and the host lock must not be held.
995 static void fc_fcp_complete_locked(struct fc_fcp_pkt
*fsp
)
997 struct fc_lport
*lport
= fsp
->lp
;
1002 if (fsp
->state
& FC_SRB_ABORT_PENDING
)
1005 if (fsp
->state
& FC_SRB_ABORTED
) {
1006 if (!fsp
->status_code
)
1007 fsp
->status_code
= FC_CMD_ABORTED
;
1010 * Test for transport underrun, independent of response
1013 if (fsp
->cdb_status
== SAM_STAT_GOOD
&&
1014 fsp
->xfer_len
< fsp
->data_len
&& !fsp
->io_status
&&
1015 (!(fsp
->scsi_comp_flags
& FCP_RESID_UNDER
) ||
1016 fsp
->xfer_len
< fsp
->data_len
- fsp
->scsi_resid
)) {
1017 FC_FCP_DBG(fsp
, "data underrun, xfer %zx data %x\n",
1018 fsp
->xfer_len
, fsp
->data_len
);
1019 fsp
->status_code
= FC_DATA_UNDRUN
;
1025 fsp
->seq_ptr
= NULL
;
1026 if (unlikely(fsp
->scsi_comp_flags
& FCP_CONF_REQ
)) {
1027 struct fc_frame
*conf_frame
;
1030 csp
= fc_seq_start_next(seq
);
1031 conf_frame
= fc_fcp_frame_alloc(fsp
->lp
, 0);
1033 f_ctl
= FC_FC_SEQ_INIT
;
1034 f_ctl
|= FC_FC_LAST_SEQ
| FC_FC_END_SEQ
;
1035 ep
= fc_seq_exch(seq
);
1036 fc_fill_fc_hdr(conf_frame
, FC_RCTL_DD_SOL_CTL
,
1038 FC_TYPE_FCP
, f_ctl
, 0);
1039 fc_seq_send(lport
, csp
, conf_frame
);
1045 * Some resets driven by SCSI are not I/Os and do not have
1046 * SCSI commands associated with the requests. We should not
1047 * call I/O completion if we do not have a SCSI command.
1054 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
1055 * @fsp: The FCP packet whose exchanges should be canceled
1056 * @error: The reason for the cancellation
1058 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt
*fsp
, int error
)
1061 fc_exch_done(fsp
->seq_ptr
);
1062 fsp
->seq_ptr
= NULL
;
1064 fsp
->status_code
= error
;
1068 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1069 * @lport: The local port whose exchanges should be canceled
1070 * @id: The target's ID
1072 * @error: The reason for cancellation
1074 * If lun or id is -1, they are ignored.
1076 static void fc_fcp_cleanup_each_cmd(struct fc_lport
*lport
, unsigned int id
,
1077 unsigned int lun
, int error
)
1079 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1080 struct fc_fcp_pkt
*fsp
;
1081 struct scsi_cmnd
*sc_cmd
;
1082 unsigned long flags
;
1084 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1086 list_for_each_entry(fsp
, &si
->scsi_pkt_queue
, list
) {
1088 if (id
!= -1 && scmd_id(sc_cmd
) != id
)
1091 if (lun
!= -1 && sc_cmd
->device
->lun
!= lun
)
1094 fc_fcp_pkt_hold(fsp
);
1095 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1097 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1098 if (!(fsp
->state
& FC_SRB_COMPL
)) {
1099 fsp
->state
|= FC_SRB_COMPL
;
1101 * TODO: dropping scsi_pkt_lock and then reacquiring
1102 * again around fc_fcp_cleanup_cmd() is required,
1103 * since fc_fcp_cleanup_cmd() calls into
1104 * fc_seq_set_resp() and that func preempts cpu using
1105 * schedule. May be schedule and related code should be
1106 * removed instead of unlocking here to avoid scheduling
1109 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1111 fc_fcp_cleanup_cmd(fsp
, error
);
1113 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1116 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1118 fc_fcp_pkt_release(fsp
);
1119 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1121 * while we dropped the lock multiple pkts could
1122 * have been released, so we have to start over.
1126 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1130 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1131 * @lport: The local port whose exchanges are to be aborted
1133 static void fc_fcp_abort_io(struct fc_lport
*lport
)
1135 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_HRD_ERROR
);
1139 * fc_fcp_pkt_send() - Send a fcp_pkt
1140 * @lport: The local port to send the FCP packet on
1141 * @fsp: The FCP packet to send
1143 * Return: Zero for success and -1 for failure
1144 * Locks: Called without locks held
1146 static int fc_fcp_pkt_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
)
1148 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
1149 unsigned long flags
;
1152 fsp
->cmd
->SCp
.ptr
= (char *)fsp
;
1153 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1154 fsp
->cdb_cmd
.fc_flags
= fsp
->req_flags
& ~FCP_CFL_LEN_MASK
;
1156 int_to_scsilun(fsp
->cmd
->device
->lun
, &fsp
->cdb_cmd
.fc_lun
);
1157 memcpy(fsp
->cdb_cmd
.fc_cdb
, fsp
->cmd
->cmnd
, fsp
->cmd
->cmd_len
);
1159 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1160 list_add_tail(&fsp
->list
, &si
->scsi_pkt_queue
);
1161 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1162 rc
= lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_fcp_recv
);
1164 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
1165 fsp
->cmd
->SCp
.ptr
= NULL
;
1166 list_del(&fsp
->list
);
1167 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
1174 * fc_fcp_cmd_send() - Send a FCP command
1175 * @lport: The local port to send the command on
1176 * @fsp: The FCP packet the command is on
1177 * @resp: The handler for the response
1179 static int fc_fcp_cmd_send(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1180 void (*resp
)(struct fc_seq
*,
1181 struct fc_frame
*fp
,
1184 struct fc_frame
*fp
;
1186 struct fc_rport
*rport
;
1187 struct fc_rport_libfc_priv
*rpriv
;
1188 const size_t len
= sizeof(fsp
->cdb_cmd
);
1191 if (fc_fcp_lock_pkt(fsp
))
1194 fp
= fc_fcp_frame_alloc(lport
, sizeof(fsp
->cdb_cmd
));
1200 memcpy(fc_frame_payload_get(fp
, len
), &fsp
->cdb_cmd
, len
);
1203 fsp
->max_payload
= rport
->maxframe_size
;
1204 rpriv
= rport
->dd_data
;
1206 fc_fill_fc_hdr(fp
, FC_RCTL_DD_UNSOL_CMD
, rport
->port_id
,
1207 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1210 seq
= fc_exch_seq_send(lport
, fp
, resp
, fc_fcp_pkt_destroy
, fsp
, 0);
1216 fc_fcp_pkt_hold(fsp
); /* hold for fc_fcp_pkt_destroy */
1218 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1219 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1220 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1223 fc_fcp_unlock_pkt(fsp
);
1228 * fc_fcp_error() - Handler for FCP layer errors
1229 * @fsp: The FCP packet the error is on
1230 * @fp: The frame that has errored
1232 static void fc_fcp_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1234 int error
= PTR_ERR(fp
);
1236 if (fc_fcp_lock_pkt(fsp
))
1239 if (error
== -FC_EX_CLOSED
) {
1240 fc_fcp_retry_cmd(fsp
, FC_ERROR
);
1245 * clear abort pending, because the lower layer
1246 * decided to force completion.
1248 fsp
->state
&= ~FC_SRB_ABORT_PENDING
;
1249 fsp
->status_code
= FC_CMD_PLOGO
;
1250 fc_fcp_complete_locked(fsp
);
1252 fc_fcp_unlock_pkt(fsp
);
1256 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1257 * @fsp: The FCP packet to abort on
1259 * Called to send an abort and then wait for abort completion
1261 static int fc_fcp_pkt_abort(struct fc_fcp_pkt
*fsp
)
1264 unsigned long ticks_left
;
1266 FC_FCP_DBG(fsp
, "pkt abort state %x\n", fsp
->state
);
1267 if (fc_fcp_send_abort(fsp
)) {
1268 FC_FCP_DBG(fsp
, "failed to send abort\n");
1272 if (fsp
->state
& FC_SRB_ABORTED
) {
1273 FC_FCP_DBG(fsp
, "target abort cmd completed\n");
1277 init_completion(&fsp
->tm_done
);
1278 fsp
->wait_for_comp
= 1;
1280 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1281 ticks_left
= wait_for_completion_timeout(&fsp
->tm_done
,
1283 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1284 fsp
->wait_for_comp
= 0;
1287 FC_FCP_DBG(fsp
, "target abort cmd failed\n");
1288 } else if (fsp
->state
& FC_SRB_ABORTED
) {
1289 FC_FCP_DBG(fsp
, "target abort cmd passed\n");
1291 fc_fcp_complete_locked(fsp
);
1298 * fc_lun_reset_send() - Send LUN reset command
1299 * @data: The FCP packet that identifies the LUN to be reset
1301 static void fc_lun_reset_send(unsigned long data
)
1303 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1304 struct fc_lport
*lport
= fsp
->lp
;
1306 if (lport
->tt
.fcp_cmd_send(lport
, fsp
, fc_tm_done
)) {
1307 if (fsp
->recov_retry
++ >= FC_MAX_RECOV_RETRY
)
1309 if (fc_fcp_lock_pkt(fsp
))
1311 setup_timer(&fsp
->timer
, fc_lun_reset_send
, (unsigned long)fsp
);
1312 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1313 fc_fcp_unlock_pkt(fsp
);
1318 * fc_lun_reset() - Send a LUN RESET command to a device
1319 * and wait for the reply
1320 * @lport: The local port to sent the command on
1321 * @fsp: The FCP packet that identifies the LUN to be reset
1322 * @id: The SCSI command ID
1323 * @lun: The LUN ID to be reset
1325 static int fc_lun_reset(struct fc_lport
*lport
, struct fc_fcp_pkt
*fsp
,
1326 unsigned int id
, unsigned int lun
)
1330 fsp
->cdb_cmd
.fc_dl
= htonl(fsp
->data_len
);
1331 fsp
->cdb_cmd
.fc_tm_flags
= FCP_TMF_LUN_RESET
;
1332 int_to_scsilun(lun
, &fsp
->cdb_cmd
.fc_lun
);
1334 fsp
->wait_for_comp
= 1;
1335 init_completion(&fsp
->tm_done
);
1337 fc_lun_reset_send((unsigned long)fsp
);
1340 * wait for completion of reset
1341 * after that make sure all commands are terminated
1343 rc
= wait_for_completion_timeout(&fsp
->tm_done
, FC_SCSI_TM_TOV
);
1345 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1346 fsp
->state
|= FC_SRB_COMPL
;
1347 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1349 del_timer_sync(&fsp
->timer
);
1351 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1353 fc_exch_done(fsp
->seq_ptr
);
1354 fsp
->seq_ptr
= NULL
;
1356 fsp
->wait_for_comp
= 0;
1357 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1360 FC_SCSI_DBG(lport
, "lun reset failed\n");
1364 /* cdb_status holds the tmf's rsp code */
1365 if (fsp
->cdb_status
!= FCP_TMF_CMPL
)
1368 FC_SCSI_DBG(lport
, "lun reset to lun %u completed\n", lun
);
1369 fc_fcp_cleanup_each_cmd(lport
, id
, lun
, FC_CMD_ABORTED
);
1374 * fc_tm_done() - Task Management response handler
1375 * @seq: The sequence that the response is on
1376 * @fp: The response frame
1377 * @arg: The FCP packet the response is for
1379 static void fc_tm_done(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1381 struct fc_fcp_pkt
*fsp
= arg
;
1382 struct fc_frame_header
*fh
;
1386 * If there is an error just let it timeout or wait
1387 * for TMF to be aborted if it timedout.
1389 * scsi-eh will escalate for when either happens.
1394 if (fc_fcp_lock_pkt(fsp
))
1398 * raced with eh timeout handler.
1400 if (!fsp
->seq_ptr
|| !fsp
->wait_for_comp
)
1403 fh
= fc_frame_header_get(fp
);
1404 if (fh
->fh_type
!= FC_TYPE_BLS
)
1405 fc_fcp_resp(fsp
, fp
);
1406 fsp
->seq_ptr
= NULL
;
1409 fc_fcp_unlock_pkt(fsp
);
1415 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1416 * @lport: The local port to be cleaned up
1418 static void fc_fcp_cleanup(struct fc_lport
*lport
)
1420 fc_fcp_cleanup_each_cmd(lport
, -1, -1, FC_ERROR
);
1424 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1425 * @data: The FCP packet that has timed out
1427 * If REC is supported then just issue it and return. The REC exchange will
1428 * complete or time out and recovery can continue at that point. Otherwise,
1429 * if the response has been received without all the data it has been
1430 * ER_TIMEOUT since the response was received. If the response has not been
1431 * received we see if data was received recently. If it has been then we
1432 * continue waiting, otherwise, we abort the command.
1434 static void fc_fcp_timeout(unsigned long data
)
1436 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)data
;
1437 struct fc_rport
*rport
= fsp
->rport
;
1438 struct fc_rport_libfc_priv
*rpriv
= rport
->dd_data
;
1440 if (fc_fcp_lock_pkt(fsp
))
1443 if (fsp
->cdb_cmd
.fc_tm_flags
)
1446 if (fsp
->lp
->qfull
) {
1447 FC_FCP_DBG(fsp
, "fcp timeout, resetting timer delay %d\n",
1449 setup_timer(&fsp
->timer
, fc_fcp_timeout
, (unsigned long)fsp
);
1450 fc_fcp_timer_set(fsp
, fsp
->timer_delay
);
1453 FC_FCP_DBG(fsp
, "fcp timeout, delay %d flags %x state %x\n",
1454 fsp
->timer_delay
, rpriv
->flags
, fsp
->state
);
1455 fsp
->state
|= FC_SRB_FCP_PROCESSING_TMO
;
1457 if (rpriv
->flags
& FC_RP_FLAGS_REC_SUPPORTED
)
1459 else if (fsp
->state
& FC_SRB_RCV_STATUS
)
1460 fc_fcp_complete_locked(fsp
);
1462 fc_fcp_recovery(fsp
, FC_TIMED_OUT
);
1463 fsp
->state
&= ~FC_SRB_FCP_PROCESSING_TMO
;
1465 fc_fcp_unlock_pkt(fsp
);
1469 * fc_fcp_rec() - Send a REC ELS request
1470 * @fsp: The FCP packet to send the REC request on
1472 static void fc_fcp_rec(struct fc_fcp_pkt
*fsp
)
1474 struct fc_lport
*lport
;
1475 struct fc_frame
*fp
;
1476 struct fc_rport
*rport
;
1477 struct fc_rport_libfc_priv
*rpriv
;
1481 rpriv
= rport
->dd_data
;
1482 if (!fsp
->seq_ptr
|| rpriv
->rp_state
!= RPORT_ST_READY
) {
1483 fsp
->status_code
= FC_HRD_ERROR
;
1485 fc_fcp_complete_locked(fsp
);
1489 fp
= fc_fcp_frame_alloc(lport
, sizeof(struct fc_els_rec
));
1493 fr_seq(fp
) = fsp
->seq_ptr
;
1494 fc_fill_fc_hdr(fp
, FC_RCTL_ELS_REQ
, rport
->port_id
,
1495 rpriv
->local_port
->port_id
, FC_TYPE_ELS
,
1497 if (lport
->tt
.elsct_send(lport
, rport
->port_id
, fp
, ELS_REC
,
1498 fc_fcp_rec_resp
, fsp
,
1499 2 * lport
->r_a_tov
)) {
1500 fc_fcp_pkt_hold(fsp
); /* hold while REC outstanding */
1504 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1505 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1507 fc_fcp_recovery(fsp
, FC_TIMED_OUT
);
1511 * fc_fcp_rec_resp() - Handler for REC ELS responses
1512 * @seq: The sequence the response is on
1513 * @fp: The response frame
1514 * @arg: The FCP packet the response is on
1516 * If the response is a reject then the scsi layer will handle
1517 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1518 * set the timeout and return. If the I/O was completed then complete the
1519 * exchange and tell the SCSI layer.
1521 static void fc_fcp_rec_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1523 struct fc_fcp_pkt
*fsp
= (struct fc_fcp_pkt
*)arg
;
1524 struct fc_els_rec_acc
*recp
;
1525 struct fc_els_ls_rjt
*rjt
;
1529 enum dma_data_direction data_dir
;
1531 struct fc_rport_libfc_priv
*rpriv
;
1534 fc_fcp_rec_error(fsp
, fp
);
1538 if (fc_fcp_lock_pkt(fsp
))
1541 fsp
->recov_retry
= 0;
1542 opcode
= fc_frame_payload_op(fp
);
1543 if (opcode
== ELS_LS_RJT
) {
1544 rjt
= fc_frame_payload_get(fp
, sizeof(*rjt
));
1545 switch (rjt
->er_reason
) {
1548 "device %x invalid REC reject %d/%d\n",
1549 fsp
->rport
->port_id
, rjt
->er_reason
,
1553 FC_FCP_DBG(fsp
, "device does not support REC\n");
1554 rpriv
= fsp
->rport
->dd_data
;
1556 * if we do not spport RECs or got some bogus
1557 * reason then resetup timer so we check for
1560 rpriv
->flags
&= ~FC_RP_FLAGS_REC_SUPPORTED
;
1564 FC_FCP_DBG(fsp
, "device %x REC reject %d/%d\n",
1565 fsp
->rport
->port_id
, rjt
->er_reason
,
1568 * If response got lost or is stuck in the
1569 * queue somewhere we have no idea if and when
1570 * the response will be received. So quarantine
1571 * the xid and retry the command.
1573 if (rjt
->er_explan
== ELS_EXPL_OXID_RXID
) {
1574 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1575 ep
->state
|= FC_EX_QUARANTINE
;
1576 fsp
->state
|= FC_SRB_ABORTED
;
1577 fc_fcp_retry_cmd(fsp
, FC_TRANS_RESET
);
1580 fc_fcp_recovery(fsp
, FC_TRANS_RESET
);
1583 } else if (opcode
== ELS_LS_ACC
) {
1584 if (fsp
->state
& FC_SRB_ABORTED
)
1587 data_dir
= fsp
->cmd
->sc_data_direction
;
1588 recp
= fc_frame_payload_get(fp
, sizeof(*recp
));
1589 offset
= ntohl(recp
->reca_fc4value
);
1590 e_stat
= ntohl(recp
->reca_e_stat
);
1592 if (e_stat
& ESB_ST_COMPLETE
) {
1595 * The exchange is complete.
1597 * For output, we must've lost the response.
1598 * For input, all data must've been sent.
1599 * We lost may have lost the response
1600 * (and a confirmation was requested) and maybe
1603 * If all data received, send SRR
1604 * asking for response. If partial data received,
1605 * or gaps, SRR requests data at start of gap.
1606 * Recovery via SRR relies on in-order-delivery.
1608 if (data_dir
== DMA_TO_DEVICE
) {
1609 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1610 } else if (fsp
->xfer_contig_end
== offset
) {
1611 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1613 offset
= fsp
->xfer_contig_end
;
1614 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1616 fc_fcp_srr(fsp
, r_ctl
, offset
);
1617 } else if (e_stat
& ESB_ST_SEQ_INIT
) {
1619 * The remote port has the initiative, so just
1620 * keep waiting for it to complete.
1622 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1626 * The exchange is incomplete, we have seq. initiative.
1627 * Lost response with requested confirmation,
1628 * lost confirmation, lost transfer ready or
1631 * For output, if not all data was received, ask
1632 * for transfer ready to be repeated.
1634 * If we received or sent all the data, send SRR to
1637 * If we lost a response, we may have lost some read
1640 r_ctl
= FC_RCTL_DD_SOL_DATA
;
1641 if (data_dir
== DMA_TO_DEVICE
) {
1642 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1643 if (offset
< fsp
->data_len
)
1644 r_ctl
= FC_RCTL_DD_DATA_DESC
;
1645 } else if (offset
== fsp
->xfer_contig_end
) {
1646 r_ctl
= FC_RCTL_DD_CMD_STATUS
;
1647 } else if (fsp
->xfer_contig_end
< offset
) {
1648 offset
= fsp
->xfer_contig_end
;
1650 fc_fcp_srr(fsp
, r_ctl
, offset
);
1654 fc_fcp_unlock_pkt(fsp
);
1656 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1661 * fc_fcp_rec_error() - Handler for REC errors
1662 * @fsp: The FCP packet the error is on
1663 * @fp: The REC frame
1665 static void fc_fcp_rec_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1667 int error
= PTR_ERR(fp
);
1669 if (fc_fcp_lock_pkt(fsp
))
1674 FC_FCP_DBG(fsp
, "REC %p fid %6.6x exchange closed\n",
1675 fsp
, fsp
->rport
->port_id
);
1676 fc_fcp_retry_cmd(fsp
, FC_ERROR
);
1680 FC_FCP_DBG(fsp
, "REC %p fid %6.6x error unexpected error %d\n",
1681 fsp
, fsp
->rport
->port_id
, error
);
1682 fsp
->status_code
= FC_CMD_PLOGO
;
1685 case -FC_EX_TIMEOUT
:
1687 * Assume REC or LS_ACC was lost.
1688 * The exchange manager will have aborted REC, so retry.
1690 FC_FCP_DBG(fsp
, "REC %p fid %6.6x exchange timeout retry %d/%d\n",
1691 fsp
, fsp
->rport
->port_id
, fsp
->recov_retry
,
1692 FC_MAX_RECOV_RETRY
);
1693 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1696 fc_fcp_recovery(fsp
, FC_ERROR
);
1699 fc_fcp_unlock_pkt(fsp
);
1701 fc_fcp_pkt_release(fsp
); /* drop hold for outstanding REC */
1705 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1706 * @fsp: The FCP pkt that needs to be aborted
1708 static void fc_fcp_recovery(struct fc_fcp_pkt
*fsp
, u8 code
)
1710 FC_FCP_DBG(fsp
, "start recovery code %x\n", code
);
1711 fsp
->status_code
= code
;
1712 fsp
->cdb_status
= 0;
1715 * if this fails then we let the scsi command timer fire and
1718 fc_fcp_send_abort(fsp
);
1722 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1723 * @fsp: The FCP packet the SRR is to be sent on
1724 * @r_ctl: The R_CTL field for the SRR request
1725 * This is called after receiving status but insufficient data, or
1726 * when expecting status but the request has timed out.
1728 static void fc_fcp_srr(struct fc_fcp_pkt
*fsp
, enum fc_rctl r_ctl
, u32 offset
)
1730 struct fc_lport
*lport
= fsp
->lp
;
1731 struct fc_rport
*rport
;
1732 struct fc_rport_libfc_priv
*rpriv
;
1733 struct fc_exch
*ep
= fc_seq_exch(fsp
->seq_ptr
);
1735 struct fcp_srr
*srr
;
1736 struct fc_frame
*fp
;
1739 rpriv
= rport
->dd_data
;
1741 if (!(rpriv
->flags
& FC_RP_FLAGS_RETRY
) ||
1742 rpriv
->rp_state
!= RPORT_ST_READY
)
1743 goto retry
; /* shouldn't happen */
1744 fp
= fc_fcp_frame_alloc(lport
, sizeof(*srr
));
1748 srr
= fc_frame_payload_get(fp
, sizeof(*srr
));
1749 memset(srr
, 0, sizeof(*srr
));
1750 srr
->srr_op
= ELS_SRR
;
1751 srr
->srr_ox_id
= htons(ep
->oxid
);
1752 srr
->srr_rx_id
= htons(ep
->rxid
);
1753 srr
->srr_r_ctl
= r_ctl
;
1754 srr
->srr_rel_off
= htonl(offset
);
1756 fc_fill_fc_hdr(fp
, FC_RCTL_ELS4_REQ
, rport
->port_id
,
1757 rpriv
->local_port
->port_id
, FC_TYPE_FCP
,
1760 seq
= fc_exch_seq_send(lport
, fp
, fc_fcp_srr_resp
,
1762 fsp
, get_fsp_rec_tov(fsp
));
1766 fsp
->recov_seq
= seq
;
1767 fsp
->xfer_len
= offset
;
1768 fsp
->xfer_contig_end
= offset
;
1769 fsp
->state
&= ~FC_SRB_RCV_STATUS
;
1770 fc_fcp_pkt_hold(fsp
); /* hold for outstanding SRR */
1773 fc_fcp_retry_cmd(fsp
, FC_TRANS_RESET
);
1777 * fc_fcp_srr_resp() - Handler for SRR response
1778 * @seq: The sequence the SRR is on
1779 * @fp: The SRR frame
1780 * @arg: The FCP packet the SRR is on
1782 static void fc_fcp_srr_resp(struct fc_seq
*seq
, struct fc_frame
*fp
, void *arg
)
1784 struct fc_fcp_pkt
*fsp
= arg
;
1785 struct fc_frame_header
*fh
;
1788 fc_fcp_srr_error(fsp
, fp
);
1792 if (fc_fcp_lock_pkt(fsp
))
1795 fh
= fc_frame_header_get(fp
);
1797 * BUG? fc_fcp_srr_error calls fc_exch_done which would release
1798 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1799 * then fc_exch_timeout would be sending an abort. The fc_exch_done
1800 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1801 * an abort response though.
1803 if (fh
->fh_type
== FC_TYPE_BLS
) {
1804 fc_fcp_unlock_pkt(fsp
);
1808 switch (fc_frame_payload_op(fp
)) {
1810 fsp
->recov_retry
= 0;
1811 fc_fcp_timer_set(fsp
, get_fsp_rec_tov(fsp
));
1815 fc_fcp_recovery(fsp
, FC_ERROR
);
1818 fc_fcp_unlock_pkt(fsp
);
1825 * fc_fcp_srr_error() - Handler for SRR errors
1826 * @fsp: The FCP packet that the SRR error is on
1827 * @fp: The SRR frame
1829 static void fc_fcp_srr_error(struct fc_fcp_pkt
*fsp
, struct fc_frame
*fp
)
1831 if (fc_fcp_lock_pkt(fsp
))
1833 switch (PTR_ERR(fp
)) {
1834 case -FC_EX_TIMEOUT
:
1835 FC_FCP_DBG(fsp
, "SRR timeout, retries %d\n", fsp
->recov_retry
);
1836 if (fsp
->recov_retry
++ < FC_MAX_RECOV_RETRY
)
1839 fc_fcp_recovery(fsp
, FC_TIMED_OUT
);
1841 case -FC_EX_CLOSED
: /* e.g., link failure */
1842 FC_FCP_DBG(fsp
, "SRR error, exchange closed\n");
1845 fc_fcp_retry_cmd(fsp
, FC_ERROR
);
1848 fc_fcp_unlock_pkt(fsp
);
1850 fc_exch_done(fsp
->recov_seq
);
1854 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1855 * @lport: The local port to be checked
1857 static inline int fc_fcp_lport_queue_ready(struct fc_lport
*lport
)
1860 return (lport
->state
== LPORT_ST_READY
) &&
1861 lport
->link_up
&& !lport
->qfull
;
1865 * fc_queuecommand() - The queuecommand function of the SCSI template
1866 * @shost: The Scsi_Host that the command was issued to
1867 * @cmd: The scsi_cmnd to be executed
1869 * This is the i/o strategy routine, called by the SCSI layer.
1871 int fc_queuecommand(struct Scsi_Host
*shost
, struct scsi_cmnd
*sc_cmd
)
1873 struct fc_lport
*lport
= shost_priv(shost
);
1874 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
1875 struct fc_fcp_pkt
*fsp
;
1876 struct fc_rport_libfc_priv
*rpriv
;
1879 struct fc_stats
*stats
;
1881 rval
= fc_remote_port_chkready(rport
);
1883 sc_cmd
->result
= rval
;
1884 sc_cmd
->scsi_done(sc_cmd
);
1888 if (!*(struct fc_remote_port
**)rport
->dd_data
) {
1890 * rport is transitioning from blocked/deleted to
1893 sc_cmd
->result
= DID_IMM_RETRY
<< 16;
1894 sc_cmd
->scsi_done(sc_cmd
);
1898 rpriv
= rport
->dd_data
;
1900 if (!fc_fcp_lport_queue_ready(lport
)) {
1902 if (fc_fcp_can_queue_ramp_down(lport
))
1903 shost_printk(KERN_ERR
, lport
->host
,
1904 "libfc: queue full, "
1905 "reducing can_queue to %d.\n",
1906 lport
->host
->can_queue
);
1908 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1912 fsp
= fc_fcp_pkt_alloc(lport
, GFP_ATOMIC
);
1914 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1919 * build the libfc request pkt
1921 fsp
->cmd
= sc_cmd
; /* save the cmd */
1922 fsp
->rport
= rport
; /* set the remote port ptr */
1925 * set up the transfer length
1927 fsp
->data_len
= scsi_bufflen(sc_cmd
);
1931 * setup the data direction
1933 stats
= per_cpu_ptr(lport
->stats
, get_cpu());
1934 if (sc_cmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
1935 fsp
->req_flags
= FC_SRB_READ
;
1936 stats
->InputRequests
++;
1937 stats
->InputBytes
+= fsp
->data_len
;
1938 } else if (sc_cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1939 fsp
->req_flags
= FC_SRB_WRITE
;
1940 stats
->OutputRequests
++;
1941 stats
->OutputBytes
+= fsp
->data_len
;
1944 stats
->ControlRequests
++;
1949 * send it to the lower layer
1950 * if we get -1 return then put the request in the pending
1953 rval
= fc_fcp_pkt_send(lport
, fsp
);
1955 fsp
->state
= FC_SRB_FREE
;
1956 fc_fcp_pkt_release(fsp
);
1957 rc
= SCSI_MLQUEUE_HOST_BUSY
;
1962 EXPORT_SYMBOL(fc_queuecommand
);
1965 * fc_io_compl() - Handle responses for completed commands
1966 * @fsp: The FCP packet that is complete
1968 * Translates fcp_pkt errors to a Linux SCSI errors.
1969 * The fcp packet lock must be held when calling.
1971 static void fc_io_compl(struct fc_fcp_pkt
*fsp
)
1973 struct fc_fcp_internal
*si
;
1974 struct scsi_cmnd
*sc_cmd
;
1975 struct fc_lport
*lport
;
1976 unsigned long flags
;
1978 /* release outstanding ddp context */
1979 fc_fcp_ddp_done(fsp
);
1981 fsp
->state
|= FC_SRB_COMPL
;
1982 if (!(fsp
->state
& FC_SRB_FCP_PROCESSING_TMO
)) {
1983 spin_unlock_bh(&fsp
->scsi_pkt_lock
);
1984 del_timer_sync(&fsp
->timer
);
1985 spin_lock_bh(&fsp
->scsi_pkt_lock
);
1989 si
= fc_get_scsi_internal(lport
);
1992 * if can_queue ramp down is done then try can_queue ramp up
1993 * since commands are completing now.
1995 if (si
->last_can_queue_ramp_down_time
)
1996 fc_fcp_can_queue_ramp_up(lport
);
1999 CMD_SCSI_STATUS(sc_cmd
) = fsp
->cdb_status
;
2000 switch (fsp
->status_code
) {
2002 if (fsp
->cdb_status
== 0) {
2006 sc_cmd
->result
= DID_OK
<< 16;
2007 if (fsp
->scsi_resid
)
2008 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
2011 * transport level I/O was ok but scsi
2012 * has non zero status
2014 sc_cmd
->result
= (DID_OK
<< 16) | fsp
->cdb_status
;
2018 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
2019 "due to FC_ERROR\n");
2020 sc_cmd
->result
= DID_ERROR
<< 16;
2022 case FC_DATA_UNDRUN
:
2023 if ((fsp
->cdb_status
== 0) && !(fsp
->req_flags
& FC_SRB_READ
)) {
2025 * scsi status is good but transport level
2028 if (fsp
->state
& FC_SRB_RCV_STATUS
) {
2029 sc_cmd
->result
= DID_OK
<< 16;
2031 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml"
2032 " due to FC_DATA_UNDRUN (trans)\n");
2033 sc_cmd
->result
= DID_ERROR
<< 16;
2037 * scsi got underrun, this is an error
2039 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
2040 "due to FC_DATA_UNDRUN (scsi)\n");
2041 CMD_RESID_LEN(sc_cmd
) = fsp
->scsi_resid
;
2042 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
2045 case FC_DATA_OVRRUN
:
2047 * overrun is an error
2049 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
2050 "due to FC_DATA_OVRRUN\n");
2051 sc_cmd
->result
= (DID_ERROR
<< 16) | fsp
->cdb_status
;
2053 case FC_CMD_ABORTED
:
2054 if (host_byte(sc_cmd
->result
) == DID_TIME_OUT
)
2055 FC_FCP_DBG(fsp
, "Returning DID_TIME_OUT to scsi-ml "
2056 "due to FC_CMD_ABORTED\n");
2058 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
2059 "due to FC_CMD_ABORTED\n");
2060 set_host_byte(sc_cmd
, DID_ERROR
);
2062 sc_cmd
->result
|= fsp
->io_status
;
2065 FC_FCP_DBG(fsp
, "Returning DID_RESET to scsi-ml "
2066 "due to FC_CMD_RESET\n");
2067 sc_cmd
->result
= (DID_RESET
<< 16);
2069 case FC_TRANS_RESET
:
2070 FC_FCP_DBG(fsp
, "Returning DID_SOFT_ERROR to scsi-ml "
2071 "due to FC_TRANS_RESET\n");
2072 sc_cmd
->result
= (DID_SOFT_ERROR
<< 16);
2075 FC_FCP_DBG(fsp
, "Returning DID_NO_CONNECT to scsi-ml "
2076 "due to FC_HRD_ERROR\n");
2077 sc_cmd
->result
= (DID_NO_CONNECT
<< 16);
2080 FC_FCP_DBG(fsp
, "Returning DID_PARITY to scsi-ml "
2081 "due to FC_CRC_ERROR\n");
2082 sc_cmd
->result
= (DID_PARITY
<< 16);
2085 FC_FCP_DBG(fsp
, "Returning DID_BUS_BUSY to scsi-ml "
2086 "due to FC_TIMED_OUT\n");
2087 sc_cmd
->result
= (DID_BUS_BUSY
<< 16) | fsp
->io_status
;
2090 FC_FCP_DBG(fsp
, "Returning DID_ERROR to scsi-ml "
2091 "due to unknown error\n");
2092 sc_cmd
->result
= (DID_ERROR
<< 16);
2096 if (lport
->state
!= LPORT_ST_READY
&& fsp
->status_code
!= FC_COMPLETE
)
2097 sc_cmd
->result
= (DID_TRANSPORT_DISRUPTED
<< 16);
2099 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
2100 list_del(&fsp
->list
);
2101 sc_cmd
->SCp
.ptr
= NULL
;
2102 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
2103 sc_cmd
->scsi_done(sc_cmd
);
2105 /* release ref from initial allocation in queue command */
2106 fc_fcp_pkt_release(fsp
);
2110 * fc_eh_abort() - Abort a command
2111 * @sc_cmd: The SCSI command to abort
2113 * From SCSI host template.
2114 * Send an ABTS to the target device and wait for the response.
2116 int fc_eh_abort(struct scsi_cmnd
*sc_cmd
)
2118 struct fc_fcp_pkt
*fsp
;
2119 struct fc_lport
*lport
;
2120 struct fc_fcp_internal
*si
;
2122 unsigned long flags
;
2125 rval
= fc_block_scsi_eh(sc_cmd
);
2129 lport
= shost_priv(sc_cmd
->device
->host
);
2130 if (lport
->state
!= LPORT_ST_READY
)
2132 else if (!lport
->link_up
)
2135 si
= fc_get_scsi_internal(lport
);
2136 spin_lock_irqsave(&si
->scsi_queue_lock
, flags
);
2137 fsp
= CMD_SP(sc_cmd
);
2139 /* command completed while scsi eh was setting up */
2140 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
2143 /* grab a ref so the fsp and sc_cmd cannot be released from under us */
2144 fc_fcp_pkt_hold(fsp
);
2145 spin_unlock_irqrestore(&si
->scsi_queue_lock
, flags
);
2147 if (fc_fcp_lock_pkt(fsp
)) {
2148 /* completed while we were waiting for timer to be deleted */
2153 rc
= fc_fcp_pkt_abort(fsp
);
2154 fc_fcp_unlock_pkt(fsp
);
2157 fc_fcp_pkt_release(fsp
);
2160 EXPORT_SYMBOL(fc_eh_abort
);
2163 * fc_eh_device_reset() - Reset a single LUN
2164 * @sc_cmd: The SCSI command which identifies the device whose
2165 * LUN is to be reset
2167 * Set from SCSI host template.
2169 int fc_eh_device_reset(struct scsi_cmnd
*sc_cmd
)
2171 struct fc_lport
*lport
;
2172 struct fc_fcp_pkt
*fsp
;
2173 struct fc_rport
*rport
= starget_to_rport(scsi_target(sc_cmd
->device
));
2177 rval
= fc_block_scsi_eh(sc_cmd
);
2181 lport
= shost_priv(sc_cmd
->device
->host
);
2183 if (lport
->state
!= LPORT_ST_READY
)
2186 FC_SCSI_DBG(lport
, "Resetting rport (%6.6x)\n", rport
->port_id
);
2188 fsp
= fc_fcp_pkt_alloc(lport
, GFP_NOIO
);
2190 printk(KERN_WARNING
"libfc: could not allocate scsi_pkt\n");
2195 * Build the libfc request pkt. Do not set the scsi cmnd, because
2196 * the sc passed in is not setup for execution like when sent
2197 * through the queuecommand callout.
2199 fsp
->rport
= rport
; /* set the remote port ptr */
2202 * flush outstanding commands
2204 rc
= fc_lun_reset(lport
, fsp
, scmd_id(sc_cmd
), sc_cmd
->device
->lun
);
2205 fsp
->state
= FC_SRB_FREE
;
2206 fc_fcp_pkt_release(fsp
);
2211 EXPORT_SYMBOL(fc_eh_device_reset
);
2214 * fc_eh_host_reset() - Reset a Scsi_Host.
2215 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2217 int fc_eh_host_reset(struct scsi_cmnd
*sc_cmd
)
2219 struct Scsi_Host
*shost
= sc_cmd
->device
->host
;
2220 struct fc_lport
*lport
= shost_priv(shost
);
2221 unsigned long wait_tmo
;
2223 FC_SCSI_DBG(lport
, "Resetting host\n");
2225 fc_block_scsi_eh(sc_cmd
);
2227 fc_lport_reset(lport
);
2228 wait_tmo
= jiffies
+ FC_HOST_RESET_TIMEOUT
;
2229 while (!fc_fcp_lport_queue_ready(lport
) && time_before(jiffies
,
2233 if (fc_fcp_lport_queue_ready(lport
)) {
2234 shost_printk(KERN_INFO
, shost
, "libfc: Host reset succeeded "
2235 "on port (%6.6x)\n", lport
->port_id
);
2238 shost_printk(KERN_INFO
, shost
, "libfc: Host reset failed, "
2239 "port (%6.6x) is not ready.\n",
2244 EXPORT_SYMBOL(fc_eh_host_reset
);
2247 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2248 * @sdev: The SCSI device that identifies the SCSI host
2250 * Configures queue depth based on host's cmd_per_len. If not set
2251 * then we use the libfc default.
2253 int fc_slave_alloc(struct scsi_device
*sdev
)
2255 struct fc_rport
*rport
= starget_to_rport(scsi_target(sdev
));
2257 if (!rport
|| fc_remote_port_chkready(rport
))
2260 scsi_change_queue_depth(sdev
, FC_FCP_DFLT_QUEUE_DEPTH
);
2263 EXPORT_SYMBOL(fc_slave_alloc
);
2266 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2267 * @lport: The local port that no longer needs the FCP layer
2269 void fc_fcp_destroy(struct fc_lport
*lport
)
2271 struct fc_fcp_internal
*si
= fc_get_scsi_internal(lport
);
2273 if (!list_empty(&si
->scsi_pkt_queue
))
2274 printk(KERN_ERR
"libfc: Leaked SCSI packets when destroying "
2275 "port (%6.6x)\n", lport
->port_id
);
2277 mempool_destroy(si
->scsi_pkt_pool
);
2279 lport
->scsi_priv
= NULL
;
2281 EXPORT_SYMBOL(fc_fcp_destroy
);
2283 int fc_setup_fcp(void)
2287 scsi_pkt_cachep
= kmem_cache_create("libfc_fcp_pkt",
2288 sizeof(struct fc_fcp_pkt
),
2289 0, SLAB_HWCACHE_ALIGN
, NULL
);
2290 if (!scsi_pkt_cachep
) {
2291 printk(KERN_ERR
"libfc: Unable to allocate SRB cache, "
2292 "module load failed!");
2299 void fc_destroy_fcp(void)
2301 if (scsi_pkt_cachep
)
2302 kmem_cache_destroy(scsi_pkt_cachep
);
2306 * fc_fcp_init() - Initialize the FCP layer for a local port
2307 * @lport: The local port to initialize the exchange layer for
2309 int fc_fcp_init(struct fc_lport
*lport
)
2312 struct fc_fcp_internal
*si
;
2314 if (!lport
->tt
.fcp_cmd_send
)
2315 lport
->tt
.fcp_cmd_send
= fc_fcp_cmd_send
;
2317 if (!lport
->tt
.fcp_cleanup
)
2318 lport
->tt
.fcp_cleanup
= fc_fcp_cleanup
;
2320 if (!lport
->tt
.fcp_abort_io
)
2321 lport
->tt
.fcp_abort_io
= fc_fcp_abort_io
;
2323 si
= kzalloc(sizeof(struct fc_fcp_internal
), GFP_KERNEL
);
2326 lport
->scsi_priv
= si
;
2327 si
->max_can_queue
= lport
->host
->can_queue
;
2328 INIT_LIST_HEAD(&si
->scsi_pkt_queue
);
2329 spin_lock_init(&si
->scsi_queue_lock
);
2331 si
->scsi_pkt_pool
= mempool_create_slab_pool(2, scsi_pkt_cachep
);
2332 if (!si
->scsi_pkt_pool
) {
2342 EXPORT_SYMBOL(fc_fcp_init
);