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(struct timer_list *);
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 timer_setup(&fsp->timer, NULL, 0);
159 INIT_LIST_HEAD(&fsp->list);
160 spin_lock_init(&fsp->scsi_pkt_lock);
162 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++;
169 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
170 * @fsp: The FCP packet to be released
172 * Context: Can be called from process or interrupt context,
173 * no lock is required.
175 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
177 if (refcount_dec_and_test(&fsp->ref_cnt)) {
178 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
180 mempool_free(fsp, si->scsi_pkt_pool);
185 * fc_fcp_pkt_hold() - Hold a fcp_pkt
186 * @fsp: The FCP packet to be held
188 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
190 refcount_inc(&fsp->ref_cnt);
194 * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt
195 * @seq: The sequence that the FCP packet is on (required by destructor API)
196 * @fsp: The FCP packet to be released
198 * This routine is called by a destructor callback in the fc_exch_seq_send()
199 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
200 * argument even though it is not used by this routine.
202 * Context: No locking required.
204 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
206 fc_fcp_pkt_release(fsp);
210 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
211 * @fsp: The FCP packet to be locked and incremented
213 * We should only return error if we return a command to SCSI-ml before
214 * getting a response. This can happen in cases where we send a abort, but
215 * do not wait for the response and the abort and command can be passing
216 * each other on the wire/network-layer.
218 * Note: this function locks the packet and gets a reference to allow
219 * callers to call the completion function while the lock is held and
220 * not have to worry about the packets refcount.
222 * TODO: Maybe we should just have callers grab/release the lock and
223 * have a function that they call to verify the fsp and grab a ref if
226 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
228 spin_lock_bh(&fsp->scsi_pkt_lock);
229 if (fsp->state & FC_SRB_COMPL) {
230 spin_unlock_bh(&fsp->scsi_pkt_lock);
234 fc_fcp_pkt_hold(fsp);
239 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
241 * @fsp: The FCP packet to be unlocked and decremented
243 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
245 spin_unlock_bh(&fsp->scsi_pkt_lock);
246 fc_fcp_pkt_release(fsp);
250 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
251 * @fsp: The FCP packet to start a timer for
252 * @delay: The timeout period in jiffies
254 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
256 if (!(fsp->state & FC_SRB_COMPL)) {
257 mod_timer(&fsp->timer, jiffies + delay);
258 fsp->timer_delay = delay;
262 static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp)
264 fsp->state |= FC_SRB_ABORTED;
265 fsp->state &= ~FC_SRB_ABORT_PENDING;
267 if (fsp->wait_for_comp)
268 complete(&fsp->tm_done);
270 fc_fcp_complete_locked(fsp);
274 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
276 * @fsp: The FCP packet to abort exchanges on
278 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
285 per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++;
288 fsp->state |= FC_SRB_ABORT_PENDING;
289 rc = fc_seq_exch_abort(fsp->seq_ptr, 0);
291 * fc_seq_exch_abort() might return -ENXIO if
292 * the sequence is already completed
295 fc_fcp_abort_done(fsp);
302 * fc_fcp_retry_cmd() - Retry a fcp_pkt
303 * @fsp: The FCP packet to be retried
305 * Sets the status code to be FC_ERROR and then calls
306 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
307 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
308 * The SCSI-ml will retry the command.
310 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code)
313 fc_exch_done(fsp->seq_ptr);
317 fsp->state &= ~FC_SRB_ABORT_PENDING;
319 fsp->status_code = status_code;
320 fc_fcp_complete_locked(fsp);
324 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
325 * @fsp: The FCP packet that will manage the DDP frames
326 * @xid: The XID that will be used for the DDP exchange
328 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
330 struct fc_lport *lport;
333 if ((fsp->req_flags & FC_SRB_READ) &&
334 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
335 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
336 scsi_sg_count(fsp->cmd)))
342 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
343 * DDP related resources for a fcp_pkt
344 * @fsp: The FCP packet that DDP had been used on
346 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
348 struct fc_lport *lport;
353 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
357 if (lport->tt.ddp_done) {
358 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
359 fsp->xfer_ddp = FC_XID_UNKNOWN;
364 * fc_fcp_can_queue_ramp_up() - increases can_queue
365 * @lport: lport to ramp up can_queue
367 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
369 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
373 spin_lock_irqsave(lport->host->host_lock, flags);
375 if (si->last_can_queue_ramp_up_time &&
376 (time_before(jiffies, si->last_can_queue_ramp_up_time +
377 FC_CAN_QUEUE_PERIOD)))
380 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
381 FC_CAN_QUEUE_PERIOD))
384 si->last_can_queue_ramp_up_time = jiffies;
386 can_queue = lport->host->can_queue << 1;
387 if (can_queue >= si->max_can_queue) {
388 can_queue = si->max_can_queue;
389 si->last_can_queue_ramp_down_time = 0;
391 lport->host->can_queue = can_queue;
392 shost_printk(KERN_ERR, lport->host, "libfc: increased "
393 "can_queue to %d.\n", can_queue);
396 spin_unlock_irqrestore(lport->host->host_lock, flags);
400 * fc_fcp_can_queue_ramp_down() - reduces can_queue
401 * @lport: lport to reduce can_queue
403 * If we are getting memory allocation failures, then we may
404 * be trying to execute too many commands. We let the running
405 * commands complete or timeout, then try again with a reduced
406 * can_queue. Eventually we will hit the point where we run
407 * on all reserved structs.
409 static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
411 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
414 bool changed = false;
416 spin_lock_irqsave(lport->host->host_lock, flags);
418 if (si->last_can_queue_ramp_down_time &&
419 (time_before(jiffies, si->last_can_queue_ramp_down_time +
420 FC_CAN_QUEUE_PERIOD)))
423 si->last_can_queue_ramp_down_time = jiffies;
425 can_queue = lport->host->can_queue;
429 lport->host->can_queue = can_queue;
433 spin_unlock_irqrestore(lport->host->host_lock, flags);
438 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
439 * @lport: fc lport struct
440 * @len: payload length
442 * Allocates fc_frame structure and buffer but if fails to allocate
443 * then reduce can_queue.
445 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
450 fp = fc_frame_alloc(lport, len);
454 per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++;
457 fc_fcp_can_queue_ramp_down(lport);
458 shost_printk(KERN_ERR, lport->host,
459 "libfc: Could not allocate frame, "
460 "reducing can_queue to %d.\n", lport->host->can_queue);
465 * get_fsp_rec_tov() - Helper function to get REC_TOV
466 * @fsp: the FCP packet
468 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
470 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
472 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
473 unsigned int e_d_tov = FC_DEF_E_D_TOV;
475 if (rpriv && rpriv->e_d_tov > e_d_tov)
476 e_d_tov = rpriv->e_d_tov;
477 return msecs_to_jiffies(e_d_tov) + HZ;
481 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
482 * @fsp: The FCP packet the data is on
483 * @fp: The data frame
485 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
487 struct scsi_cmnd *sc = fsp->cmd;
488 struct fc_lport *lport = fsp->lp;
489 struct fc_stats *stats;
490 struct fc_frame_header *fh;
497 struct scatterlist *sg;
499 u8 host_bcode = FC_COMPLETE;
501 fh = fc_frame_header_get(fp);
502 offset = ntohl(fh->fh_parm_offset);
503 start_offset = offset;
504 len = fr_len(fp) - sizeof(*fh);
505 buf = fc_frame_payload_get(fp, 0);
508 * if this I/O is ddped then clear it and initiate recovery since data
509 * frames are expected to be placed directly in that case.
511 * Indicate error to scsi-ml because something went wrong with the
512 * ddp handling to get us here.
514 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
515 fc_fcp_ddp_done(fsp);
516 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
517 host_bcode = FC_ERROR;
520 if (offset + len > fsp->data_len) {
521 /* this should never happen */
522 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
523 fc_frame_crc_check(fp))
525 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
526 "data_len %x\n", len, offset, fsp->data_len);
528 /* Data is corrupted indicate scsi-ml should retry */
529 host_bcode = FC_DATA_OVRRUN;
532 if (offset != fsp->xfer_len)
533 fsp->state |= FC_SRB_DISCONTIG;
535 sg = scsi_sglist(sc);
536 nents = scsi_sg_count(sc);
538 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
539 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
542 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
543 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
545 buf = fc_frame_payload_get(fp, 0);
547 crc = crc32(crc, buf + len, 4 - (len % 4));
549 if (~crc != le32_to_cpu(fr_crc(fp))) {
551 stats = per_cpu_ptr(lport->stats, get_cpu());
552 stats->ErrorFrames++;
553 /* per cpu count, not total count, but OK for limit */
554 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
555 printk(KERN_WARNING "libfc: CRC error on data "
556 "frame for port (%6.6x)\n",
560 * Assume the frame is total garbage.
561 * We may have copied it over the good part
563 * If so, we need to retry the entire operation.
564 * Otherwise, ignore it.
566 if (fsp->state & FC_SRB_DISCONTIG) {
567 host_bcode = FC_CRC_ERROR;
574 if (fsp->xfer_contig_end == start_offset)
575 fsp->xfer_contig_end += copy_len;
576 fsp->xfer_len += copy_len;
579 * In the very rare event that this data arrived after the response
580 * and completes the transfer, call the completion handler.
582 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
583 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) {
584 FC_FCP_DBG( fsp, "complete out-of-order sequence\n" );
585 fc_fcp_complete_locked(fsp);
589 fc_fcp_recovery(fsp, host_bcode);
593 * fc_fcp_send_data() - Send SCSI data to a target
594 * @fsp: The FCP packet the data is on
595 * @sp: The sequence the data is to be sent on
596 * @offset: The starting offset for this data request
597 * @seq_blen: The burst length for this data request
599 * Called after receiving a Transfer Ready data descriptor.
600 * If the LLD is capable of sequence offload then send down the
601 * seq_blen amount of data in single frame, otherwise send
602 * multiple frames of the maximum frame payload supported by
605 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
606 size_t offset, size_t seq_blen)
609 struct scsi_cmnd *sc;
610 struct scatterlist *sg;
611 struct fc_frame *fp = NULL;
612 struct fc_lport *lport = fsp->lp;
618 size_t frame_offset, fh_parm_offset;
623 int using_sg = lport->sg_supp;
626 WARN_ON(seq_blen <= 0);
627 if (unlikely(offset + seq_blen > fsp->data_len)) {
628 /* this should never happen */
629 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
630 "offset %zx\n", seq_blen, offset);
631 fc_fcp_send_abort(fsp);
633 } else if (offset != fsp->xfer_len) {
634 /* Out of Order Data Request - no problem, but unexpected. */
635 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
636 "seq_blen %zx offset %zx\n", seq_blen, offset);
640 * if LLD is capable of seq_offload then set transport
641 * burst length (t_blen) to seq_blen, otherwise set t_blen
642 * to max FC frame payload previously set in fsp->max_payload.
644 t_blen = fsp->max_payload;
645 if (lport->seq_offload) {
646 t_blen = min(seq_blen, (size_t)lport->lso_max);
647 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
648 fsp, seq_blen, lport->lso_max, t_blen);
652 t_blen &= ~(512 - 1); /* round down to block size */
655 remaining = seq_blen;
656 fh_parm_offset = frame_offset = offset;
658 seq = fc_seq_start_next(seq);
659 f_ctl = FC_FC_REL_OFF;
662 sg = scsi_sglist(sc);
664 while (remaining > 0 && sg) {
665 if (offset >= sg->length) {
666 offset -= sg->length;
671 tlen = min(t_blen, remaining);
674 * TODO. Temporary workaround. fc_seq_send() can't
675 * handle odd lengths in non-linear skbs.
676 * This will be the final fragment only.
680 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
684 data = fc_frame_header_get(fp) + 1;
685 fh_parm_offset = frame_offset;
686 fr_max_payload(fp) = fsp->max_payload;
689 off = offset + sg->offset;
690 sg_bytes = min(tlen, sg->length - offset);
691 sg_bytes = min(sg_bytes,
692 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
693 page = sg_page(sg) + (off >> PAGE_SHIFT);
696 skb_fill_page_desc(fp_skb(fp),
697 skb_shinfo(fp_skb(fp))->nr_frags,
698 page, off & ~PAGE_MASK, sg_bytes);
699 fp_skb(fp)->data_len += sg_bytes;
700 fr_len(fp) += sg_bytes;
701 fp_skb(fp)->truesize += PAGE_SIZE;
704 * The scatterlist item may be bigger than PAGE_SIZE,
705 * but we must not cross pages inside the kmap.
707 page_addr = kmap_atomic(page);
708 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
710 kunmap_atomic(page_addr);
714 frame_offset += sg_bytes;
716 remaining -= sg_bytes;
718 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
723 * Send sequence with transfer sequence initiative in case
724 * this is last FCP frame of the sequence.
727 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
729 ep = fc_seq_exch(seq);
730 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
731 FC_TYPE_FCP, f_ctl, fh_parm_offset);
734 * send fragment using for a sequence.
736 error = fc_seq_send(lport, seq, fp);
738 WARN_ON(1); /* send error should be rare */
743 fsp->xfer_len += seq_blen; /* premature count? */
748 * fc_fcp_abts_resp() - Receive an ABTS response
749 * @fsp: The FCP packet that is being aborted
750 * @fp: The response frame
752 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
755 struct fc_ba_rjt *brp;
756 struct fc_frame_header *fh;
758 fh = fc_frame_header_get(fp);
759 switch (fh->fh_r_ctl) {
763 brp = fc_frame_payload_get(fp, sizeof(*brp));
764 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
769 * we will let the command timeout
770 * and scsi-ml recover in this case,
771 * therefore cleared the ba_done flag.
777 fc_fcp_abort_done(fsp);
781 * fc_fcp_recv() - Receive an FCP frame
782 * @seq: The sequence the frame is on
783 * @fp: The received frame
784 * @arg: The related FCP packet
786 * Context: Called from Soft IRQ context. Can not be called
787 * holding the FCP packet list lock.
789 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
791 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
792 struct fc_lport *lport = fsp->lp;
793 struct fc_frame_header *fh;
794 struct fcp_txrdy *dd;
799 fc_fcp_error(fsp, fp);
803 fh = fc_frame_header_get(fp);
804 r_ctl = fh->fh_r_ctl;
806 if (lport->state != LPORT_ST_READY) {
807 FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n",
808 lport->state, r_ctl);
811 if (fc_fcp_lock_pkt(fsp))
814 if (fh->fh_type == FC_TYPE_BLS) {
815 fc_fcp_abts_resp(fsp, fp);
819 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) {
820 FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl);
824 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
826 * received XFER RDY from the target
827 * need to send data to the target
829 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
830 dd = fc_frame_payload_get(fp, sizeof(*dd));
833 rc = fc_fcp_send_data(fsp, seq,
834 (size_t) ntohl(dd->ft_data_ro),
835 (size_t) ntohl(dd->ft_burst_len));
837 seq->rec_data = fsp->xfer_len;
838 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
840 * received a DATA frame
841 * next we will copy the data to the system buffer
843 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
844 fc_fcp_recv_data(fsp, fp);
845 seq->rec_data = fsp->xfer_contig_end;
846 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
847 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
849 fc_fcp_resp(fsp, fp);
851 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
854 fc_fcp_unlock_pkt(fsp);
860 * fc_fcp_resp() - Handler for FCP responses
861 * @fsp: The FCP packet the response is for
862 * @fp: The response frame
864 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
866 struct fc_frame_header *fh;
867 struct fcp_resp *fc_rp;
868 struct fcp_resp_ext *rp_ex;
869 struct fcp_resp_rsp_info *fc_rp_info;
877 fh = (struct fc_frame_header *)fr_hdr(fp);
878 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
881 fc_rp = (struct fcp_resp *)(fh + 1);
882 fsp->cdb_status = fc_rp->fr_status;
883 flags = fc_rp->fr_flags;
884 fsp->scsi_comp_flags = flags;
885 expected_len = fsp->data_len;
887 /* if ddp, update xfer len */
888 fc_fcp_ddp_done(fsp);
890 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
891 rp_ex = (void *)(fc_rp + 1);
892 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
893 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
895 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
896 if (flags & FCP_RSP_LEN_VAL) {
897 respl = ntohl(rp_ex->fr_rsp_len);
898 if ((respl != FCP_RESP_RSP_INFO_LEN4) &&
899 (respl != FCP_RESP_RSP_INFO_LEN8))
901 if (fsp->wait_for_comp) {
902 /* Abuse cdb_status for rsp code */
903 fsp->cdb_status = fc_rp_info->rsp_code;
904 complete(&fsp->tm_done);
906 * tmfs will not have any scsi cmd so
912 if (flags & FCP_SNS_LEN_VAL) {
913 snsl = ntohl(rp_ex->fr_sns_len);
914 if (snsl > SCSI_SENSE_BUFFERSIZE)
915 snsl = SCSI_SENSE_BUFFERSIZE;
916 memcpy(fsp->cmd->sense_buffer,
917 (char *)fc_rp_info + respl, snsl);
920 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
921 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
923 if (flags & FCP_RESID_UNDER) {
924 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
926 * The cmnd->underflow is the minimum number of
927 * bytes that must be transferred for this
928 * command. Provided a sense condition is not
929 * present, make sure the actual amount
930 * transferred is at least the underflow value
933 if (!(flags & FCP_SNS_LEN_VAL) &&
934 (fc_rp->fr_status == 0) &&
935 (scsi_bufflen(fsp->cmd) -
936 fsp->scsi_resid) < fsp->cmd->underflow)
938 expected_len -= fsp->scsi_resid;
940 fsp->status_code = FC_ERROR;
944 fsp->state |= FC_SRB_RCV_STATUS;
947 * Check for missing or extra data frames.
949 if (unlikely(fsp->cdb_status == SAM_STAT_GOOD &&
950 fsp->xfer_len != expected_len)) {
951 if (fsp->xfer_len < expected_len) {
953 * Some data may be queued locally,
954 * Wait a at least one jiffy to see if it is delivered.
955 * If this expires without data, we may do SRR.
957 if (fsp->lp->qfull) {
958 FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n",
959 fsp->rport->port_id);
962 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun "
963 "len %x, data len %x\n",
965 fsp->xfer_len, expected_len, fsp->data_len);
966 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
969 fsp->status_code = FC_DATA_OVRRUN;
970 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
971 "len %x, data len %x\n",
973 fsp->xfer_len, expected_len, fsp->data_len);
975 fc_fcp_complete_locked(fsp);
979 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
980 "snsl %u\n", flags, fr_len(fp), respl, snsl);
982 fsp->status_code = FC_ERROR;
983 fc_fcp_complete_locked(fsp);
987 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
989 * @fsp: The FCP packet to be completed
991 * This function may sleep if a timer is pending. The packet lock must be
992 * held, and the host lock must not be held.
994 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
996 struct fc_lport *lport = fsp->lp;
1001 if (fsp->state & FC_SRB_ABORT_PENDING)
1004 if (fsp->state & FC_SRB_ABORTED) {
1005 if (!fsp->status_code)
1006 fsp->status_code = FC_CMD_ABORTED;
1009 * Test for transport underrun, independent of response
1012 if (fsp->cdb_status == SAM_STAT_GOOD &&
1013 fsp->xfer_len < fsp->data_len && !fsp->io_status &&
1014 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
1015 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
1016 FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n",
1017 fsp->xfer_len, fsp->data_len);
1018 fsp->status_code = FC_DATA_UNDRUN;
1024 fsp->seq_ptr = NULL;
1025 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
1026 struct fc_frame *conf_frame;
1029 csp = fc_seq_start_next(seq);
1030 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
1032 f_ctl = FC_FC_SEQ_INIT;
1033 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
1034 ep = fc_seq_exch(seq);
1035 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
1037 FC_TYPE_FCP, f_ctl, 0);
1038 fc_seq_send(lport, csp, conf_frame);
1044 * Some resets driven by SCSI are not I/Os and do not have
1045 * SCSI commands associated with the requests. We should not
1046 * call I/O completion if we do not have a SCSI command.
1053 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
1054 * @fsp: The FCP packet whose exchanges should be canceled
1055 * @error: The reason for the cancellation
1057 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
1060 fc_exch_done(fsp->seq_ptr);
1061 fsp->seq_ptr = NULL;
1063 fsp->status_code = error;
1067 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1068 * @lport: The local port whose exchanges should be canceled
1069 * @id: The target's ID
1071 * @error: The reason for cancellation
1073 * If lun or id is -1, they are ignored.
1075 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1076 unsigned int lun, int error)
1078 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1079 struct fc_fcp_pkt *fsp;
1080 struct scsi_cmnd *sc_cmd;
1081 unsigned long flags;
1083 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1085 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1087 if (id != -1 && scmd_id(sc_cmd) != id)
1090 if (lun != -1 && sc_cmd->device->lun != lun)
1093 fc_fcp_pkt_hold(fsp);
1094 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1096 spin_lock_bh(&fsp->scsi_pkt_lock);
1097 if (!(fsp->state & FC_SRB_COMPL)) {
1098 fsp->state |= FC_SRB_COMPL;
1100 * TODO: dropping scsi_pkt_lock and then reacquiring
1101 * again around fc_fcp_cleanup_cmd() is required,
1102 * since fc_fcp_cleanup_cmd() calls into
1103 * fc_seq_set_resp() and that func preempts cpu using
1104 * schedule. May be schedule and related code should be
1105 * removed instead of unlocking here to avoid scheduling
1108 spin_unlock_bh(&fsp->scsi_pkt_lock);
1110 fc_fcp_cleanup_cmd(fsp, error);
1112 spin_lock_bh(&fsp->scsi_pkt_lock);
1115 spin_unlock_bh(&fsp->scsi_pkt_lock);
1117 fc_fcp_pkt_release(fsp);
1118 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1120 * while we dropped the lock multiple pkts could
1121 * have been released, so we have to start over.
1125 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1129 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1130 * @lport: The local port whose exchanges are to be aborted
1132 static void fc_fcp_abort_io(struct fc_lport *lport)
1134 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1138 * fc_fcp_pkt_send() - Send a fcp_pkt
1139 * @lport: The local port to send the FCP packet on
1140 * @fsp: The FCP packet to send
1142 * Return: Zero for success and -1 for failure
1143 * Locks: Called without locks held
1145 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1147 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1148 unsigned long flags;
1151 fsp->cmd->SCp.ptr = (char *)fsp;
1152 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1153 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1155 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun);
1156 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1158 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1159 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1160 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1161 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1163 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1164 fsp->cmd->SCp.ptr = NULL;
1165 list_del(&fsp->list);
1166 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1173 * fc_fcp_cmd_send() - Send a FCP command
1174 * @lport: The local port to send the command on
1175 * @fsp: The FCP packet the command is on
1176 * @resp: The handler for the response
1178 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1179 void (*resp)(struct fc_seq *,
1180 struct fc_frame *fp,
1183 struct fc_frame *fp;
1185 struct fc_rport *rport;
1186 struct fc_rport_libfc_priv *rpriv;
1187 const size_t len = sizeof(fsp->cdb_cmd);
1190 if (fc_fcp_lock_pkt(fsp))
1193 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1199 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1202 fsp->max_payload = rport->maxframe_size;
1203 rpriv = rport->dd_data;
1205 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1206 rpriv->local_port->port_id, FC_TYPE_FCP,
1209 seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1215 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1217 fsp->timer.function = fc_fcp_timeout;
1218 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1219 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1222 fc_fcp_unlock_pkt(fsp);
1227 * fc_fcp_error() - Handler for FCP layer errors
1228 * @fsp: The FCP packet the error is on
1229 * @fp: The frame that has errored
1231 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1233 int error = PTR_ERR(fp);
1235 if (fc_fcp_lock_pkt(fsp))
1238 if (error == -FC_EX_CLOSED) {
1239 fc_fcp_retry_cmd(fsp, FC_ERROR);
1244 * clear abort pending, because the lower layer
1245 * decided to force completion.
1247 fsp->state &= ~FC_SRB_ABORT_PENDING;
1248 fsp->status_code = FC_CMD_PLOGO;
1249 fc_fcp_complete_locked(fsp);
1251 fc_fcp_unlock_pkt(fsp);
1255 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1256 * @fsp: The FCP packet to abort on
1258 * Called to send an abort and then wait for abort completion
1260 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1263 unsigned long ticks_left;
1265 FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state);
1266 if (fc_fcp_send_abort(fsp)) {
1267 FC_FCP_DBG(fsp, "failed to send abort\n");
1271 if (fsp->state & FC_SRB_ABORTED) {
1272 FC_FCP_DBG(fsp, "target abort cmd completed\n");
1276 init_completion(&fsp->tm_done);
1277 fsp->wait_for_comp = 1;
1279 spin_unlock_bh(&fsp->scsi_pkt_lock);
1280 ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1282 spin_lock_bh(&fsp->scsi_pkt_lock);
1283 fsp->wait_for_comp = 0;
1286 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1287 } else if (fsp->state & FC_SRB_ABORTED) {
1288 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1290 fc_fcp_complete_locked(fsp);
1297 * fc_lun_reset_send() - Send LUN reset command
1298 * @data: The FCP packet that identifies the LUN to be reset
1300 static void fc_lun_reset_send(struct timer_list *t)
1302 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer);
1303 struct fc_lport *lport = fsp->lp;
1305 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1306 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1308 if (fc_fcp_lock_pkt(fsp))
1310 fsp->timer.function = fc_lun_reset_send;
1311 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1312 fc_fcp_unlock_pkt(fsp);
1317 * fc_lun_reset() - Send a LUN RESET command to a device
1318 * and wait for the reply
1319 * @lport: The local port to sent the command on
1320 * @fsp: The FCP packet that identifies the LUN to be reset
1321 * @id: The SCSI command ID
1322 * @lun: The LUN ID to be reset
1324 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1325 unsigned int id, unsigned int lun)
1329 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1330 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1331 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun);
1333 fsp->wait_for_comp = 1;
1334 init_completion(&fsp->tm_done);
1336 fc_lun_reset_send(&fsp->timer);
1339 * wait for completion of reset
1340 * after that make sure all commands are terminated
1342 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1344 spin_lock_bh(&fsp->scsi_pkt_lock);
1345 fsp->state |= FC_SRB_COMPL;
1346 spin_unlock_bh(&fsp->scsi_pkt_lock);
1348 del_timer_sync(&fsp->timer);
1350 spin_lock_bh(&fsp->scsi_pkt_lock);
1352 fc_exch_done(fsp->seq_ptr);
1353 fsp->seq_ptr = NULL;
1355 fsp->wait_for_comp = 0;
1356 spin_unlock_bh(&fsp->scsi_pkt_lock);
1359 FC_SCSI_DBG(lport, "lun reset failed\n");
1363 /* cdb_status holds the tmf's rsp code */
1364 if (fsp->cdb_status != FCP_TMF_CMPL)
1367 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1368 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1373 * fc_tm_done() - Task Management response handler
1374 * @seq: The sequence that the response is on
1375 * @fp: The response frame
1376 * @arg: The FCP packet the response is for
1378 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1380 struct fc_fcp_pkt *fsp = arg;
1381 struct fc_frame_header *fh;
1385 * If there is an error just let it timeout or wait
1386 * for TMF to be aborted if it timedout.
1388 * scsi-eh will escalate for when either happens.
1393 if (fc_fcp_lock_pkt(fsp))
1397 * raced with eh timeout handler.
1399 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1402 fh = fc_frame_header_get(fp);
1403 if (fh->fh_type != FC_TYPE_BLS)
1404 fc_fcp_resp(fsp, fp);
1405 fsp->seq_ptr = NULL;
1408 fc_fcp_unlock_pkt(fsp);
1414 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1415 * @lport: The local port to be cleaned up
1417 static void fc_fcp_cleanup(struct fc_lport *lport)
1419 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1423 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1424 * @data: The FCP packet that has timed out
1426 * If REC is supported then just issue it and return. The REC exchange will
1427 * complete or time out and recovery can continue at that point. Otherwise,
1428 * if the response has been received without all the data it has been
1429 * ER_TIMEOUT since the response was received. If the response has not been
1430 * received we see if data was received recently. If it has been then we
1431 * continue waiting, otherwise, we abort the command.
1433 static void fc_fcp_timeout(struct timer_list *t)
1435 struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer);
1436 struct fc_rport *rport = fsp->rport;
1437 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1439 if (fc_fcp_lock_pkt(fsp))
1442 if (fsp->cdb_cmd.fc_tm_flags)
1445 if (fsp->lp->qfull) {
1446 FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n",
1448 fsp->timer.function = fc_fcp_timeout;
1449 fc_fcp_timer_set(fsp, fsp->timer_delay);
1452 FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n",
1453 fsp->timer_delay, rpriv->flags, fsp->state);
1454 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1456 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1458 else if (fsp->state & FC_SRB_RCV_STATUS)
1459 fc_fcp_complete_locked(fsp);
1461 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1462 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1464 fc_fcp_unlock_pkt(fsp);
1468 * fc_fcp_rec() - Send a REC ELS request
1469 * @fsp: The FCP packet to send the REC request on
1471 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1473 struct fc_lport *lport;
1474 struct fc_frame *fp;
1475 struct fc_rport *rport;
1476 struct fc_rport_libfc_priv *rpriv;
1480 rpriv = rport->dd_data;
1481 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1482 fsp->status_code = FC_HRD_ERROR;
1484 fc_fcp_complete_locked(fsp);
1488 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1492 fr_seq(fp) = fsp->seq_ptr;
1493 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1494 rpriv->local_port->port_id, FC_TYPE_ELS,
1496 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1497 fc_fcp_rec_resp, fsp,
1498 2 * lport->r_a_tov)) {
1499 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1503 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1504 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1506 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1510 * fc_fcp_rec_resp() - Handler for REC ELS responses
1511 * @seq: The sequence the response is on
1512 * @fp: The response frame
1513 * @arg: The FCP packet the response is on
1515 * If the response is a reject then the scsi layer will handle
1516 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1517 * set the timeout and return. If the I/O was completed then complete the
1518 * exchange and tell the SCSI layer.
1520 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1522 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1523 struct fc_els_rec_acc *recp;
1524 struct fc_els_ls_rjt *rjt;
1528 enum dma_data_direction data_dir;
1530 struct fc_rport_libfc_priv *rpriv;
1533 fc_fcp_rec_error(fsp, fp);
1537 if (fc_fcp_lock_pkt(fsp))
1540 fsp->recov_retry = 0;
1541 opcode = fc_frame_payload_op(fp);
1542 if (opcode == ELS_LS_RJT) {
1543 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1544 switch (rjt->er_reason) {
1547 "device %x invalid REC reject %d/%d\n",
1548 fsp->rport->port_id, rjt->er_reason,
1552 FC_FCP_DBG(fsp, "device does not support REC\n");
1553 rpriv = fsp->rport->dd_data;
1555 * if we do not spport RECs or got some bogus
1556 * reason then resetup timer so we check for
1559 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1563 FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n",
1564 fsp->rport->port_id, rjt->er_reason,
1567 * If response got lost or is stuck in the
1568 * queue somewhere we have no idea if and when
1569 * the response will be received. So quarantine
1570 * the xid and retry the command.
1572 if (rjt->er_explan == ELS_EXPL_OXID_RXID) {
1573 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1574 ep->state |= FC_EX_QUARANTINE;
1575 fsp->state |= FC_SRB_ABORTED;
1576 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);
1579 fc_fcp_recovery(fsp, FC_TRANS_RESET);
1582 } else if (opcode == ELS_LS_ACC) {
1583 if (fsp->state & FC_SRB_ABORTED)
1586 data_dir = fsp->cmd->sc_data_direction;
1587 recp = fc_frame_payload_get(fp, sizeof(*recp));
1588 offset = ntohl(recp->reca_fc4value);
1589 e_stat = ntohl(recp->reca_e_stat);
1591 if (e_stat & ESB_ST_COMPLETE) {
1594 * The exchange is complete.
1596 * For output, we must've lost the response.
1597 * For input, all data must've been sent.
1598 * We lost may have lost the response
1599 * (and a confirmation was requested) and maybe
1602 * If all data received, send SRR
1603 * asking for response. If partial data received,
1604 * or gaps, SRR requests data at start of gap.
1605 * Recovery via SRR relies on in-order-delivery.
1607 if (data_dir == DMA_TO_DEVICE) {
1608 r_ctl = FC_RCTL_DD_CMD_STATUS;
1609 } else if (fsp->xfer_contig_end == offset) {
1610 r_ctl = FC_RCTL_DD_CMD_STATUS;
1612 offset = fsp->xfer_contig_end;
1613 r_ctl = FC_RCTL_DD_SOL_DATA;
1615 fc_fcp_srr(fsp, r_ctl, offset);
1616 } else if (e_stat & ESB_ST_SEQ_INIT) {
1618 * The remote port has the initiative, so just
1619 * keep waiting for it to complete.
1621 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1625 * The exchange is incomplete, we have seq. initiative.
1626 * Lost response with requested confirmation,
1627 * lost confirmation, lost transfer ready or
1630 * For output, if not all data was received, ask
1631 * for transfer ready to be repeated.
1633 * If we received or sent all the data, send SRR to
1636 * If we lost a response, we may have lost some read
1639 r_ctl = FC_RCTL_DD_SOL_DATA;
1640 if (data_dir == DMA_TO_DEVICE) {
1641 r_ctl = FC_RCTL_DD_CMD_STATUS;
1642 if (offset < fsp->data_len)
1643 r_ctl = FC_RCTL_DD_DATA_DESC;
1644 } else if (offset == fsp->xfer_contig_end) {
1645 r_ctl = FC_RCTL_DD_CMD_STATUS;
1646 } else if (fsp->xfer_contig_end < offset) {
1647 offset = fsp->xfer_contig_end;
1649 fc_fcp_srr(fsp, r_ctl, offset);
1653 fc_fcp_unlock_pkt(fsp);
1655 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1660 * fc_fcp_rec_error() - Handler for REC errors
1661 * @fsp: The FCP packet the error is on
1662 * @fp: The REC frame
1664 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1666 int error = PTR_ERR(fp);
1668 if (fc_fcp_lock_pkt(fsp))
1673 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n",
1674 fsp, fsp->rport->port_id);
1675 fc_fcp_retry_cmd(fsp, FC_ERROR);
1679 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1680 fsp, fsp->rport->port_id, error);
1681 fsp->status_code = FC_CMD_PLOGO;
1684 case -FC_EX_TIMEOUT:
1686 * Assume REC or LS_ACC was lost.
1687 * The exchange manager will have aborted REC, so retry.
1689 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n",
1690 fsp, fsp->rport->port_id, fsp->recov_retry,
1691 FC_MAX_RECOV_RETRY);
1692 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1695 fc_fcp_recovery(fsp, FC_ERROR);
1698 fc_fcp_unlock_pkt(fsp);
1700 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1704 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1705 * @fsp: The FCP pkt that needs to be aborted
1707 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1709 FC_FCP_DBG(fsp, "start recovery code %x\n", code);
1710 fsp->status_code = code;
1711 fsp->cdb_status = 0;
1714 * if this fails then we let the scsi command timer fire and
1717 fc_fcp_send_abort(fsp);
1721 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1722 * @fsp: The FCP packet the SRR is to be sent on
1723 * @r_ctl: The R_CTL field for the SRR request
1724 * This is called after receiving status but insufficient data, or
1725 * when expecting status but the request has timed out.
1727 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1729 struct fc_lport *lport = fsp->lp;
1730 struct fc_rport *rport;
1731 struct fc_rport_libfc_priv *rpriv;
1732 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1734 struct fcp_srr *srr;
1735 struct fc_frame *fp;
1738 rpriv = rport->dd_data;
1740 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1741 rpriv->rp_state != RPORT_ST_READY)
1742 goto retry; /* shouldn't happen */
1743 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1747 srr = fc_frame_payload_get(fp, sizeof(*srr));
1748 memset(srr, 0, sizeof(*srr));
1749 srr->srr_op = ELS_SRR;
1750 srr->srr_ox_id = htons(ep->oxid);
1751 srr->srr_rx_id = htons(ep->rxid);
1752 srr->srr_r_ctl = r_ctl;
1753 srr->srr_rel_off = htonl(offset);
1755 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1756 rpriv->local_port->port_id, FC_TYPE_FCP,
1759 seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp,
1761 fsp, get_fsp_rec_tov(fsp));
1765 fsp->recov_seq = seq;
1766 fsp->xfer_len = offset;
1767 fsp->xfer_contig_end = offset;
1768 fsp->state &= ~FC_SRB_RCV_STATUS;
1769 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1772 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);
1776 * fc_fcp_srr_resp() - Handler for SRR response
1777 * @seq: The sequence the SRR is on
1778 * @fp: The SRR frame
1779 * @arg: The FCP packet the SRR is on
1781 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1783 struct fc_fcp_pkt *fsp = arg;
1784 struct fc_frame_header *fh;
1787 fc_fcp_srr_error(fsp, fp);
1791 if (fc_fcp_lock_pkt(fsp))
1794 fh = fc_frame_header_get(fp);
1796 * BUG? fc_fcp_srr_error calls fc_exch_done which would release
1797 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1798 * then fc_exch_timeout would be sending an abort. The fc_exch_done
1799 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1800 * an abort response though.
1802 if (fh->fh_type == FC_TYPE_BLS) {
1803 fc_fcp_unlock_pkt(fsp);
1807 switch (fc_frame_payload_op(fp)) {
1809 fsp->recov_retry = 0;
1810 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1814 fc_fcp_recovery(fsp, FC_ERROR);
1817 fc_fcp_unlock_pkt(fsp);
1824 * fc_fcp_srr_error() - Handler for SRR errors
1825 * @fsp: The FCP packet that the SRR error is on
1826 * @fp: The SRR frame
1828 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1830 if (fc_fcp_lock_pkt(fsp))
1832 switch (PTR_ERR(fp)) {
1833 case -FC_EX_TIMEOUT:
1834 FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry);
1835 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1838 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1840 case -FC_EX_CLOSED: /* e.g., link failure */
1841 FC_FCP_DBG(fsp, "SRR error, exchange closed\n");
1844 fc_fcp_retry_cmd(fsp, FC_ERROR);
1847 fc_fcp_unlock_pkt(fsp);
1849 fc_exch_done(fsp->recov_seq);
1853 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1854 * @lport: The local port to be checked
1856 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1859 return (lport->state == LPORT_ST_READY) &&
1860 lport->link_up && !lport->qfull;
1864 * fc_queuecommand() - The queuecommand function of the SCSI template
1865 * @shost: The Scsi_Host that the command was issued to
1866 * @cmd: The scsi_cmnd to be executed
1868 * This is the i/o strategy routine, called by the SCSI layer.
1870 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1872 struct fc_lport *lport = shost_priv(shost);
1873 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1874 struct fc_fcp_pkt *fsp;
1877 struct fc_stats *stats;
1879 rval = fc_remote_port_chkready(rport);
1881 sc_cmd->result = rval;
1882 sc_cmd->scsi_done(sc_cmd);
1886 if (!*(struct fc_remote_port **)rport->dd_data) {
1888 * rport is transitioning from blocked/deleted to
1891 sc_cmd->result = DID_IMM_RETRY << 16;
1892 sc_cmd->scsi_done(sc_cmd);
1896 if (!fc_fcp_lport_queue_ready(lport)) {
1898 if (fc_fcp_can_queue_ramp_down(lport))
1899 shost_printk(KERN_ERR, lport->host,
1900 "libfc: queue full, "
1901 "reducing can_queue to %d.\n",
1902 lport->host->can_queue);
1904 rc = SCSI_MLQUEUE_HOST_BUSY;
1908 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1910 rc = SCSI_MLQUEUE_HOST_BUSY;
1915 * build the libfc request pkt
1917 fsp->cmd = sc_cmd; /* save the cmd */
1918 fsp->rport = rport; /* set the remote port ptr */
1921 * set up the transfer length
1923 fsp->data_len = scsi_bufflen(sc_cmd);
1927 * setup the data direction
1929 stats = per_cpu_ptr(lport->stats, get_cpu());
1930 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1931 fsp->req_flags = FC_SRB_READ;
1932 stats->InputRequests++;
1933 stats->InputBytes += fsp->data_len;
1934 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1935 fsp->req_flags = FC_SRB_WRITE;
1936 stats->OutputRequests++;
1937 stats->OutputBytes += fsp->data_len;
1940 stats->ControlRequests++;
1945 * send it to the lower layer
1946 * if we get -1 return then put the request in the pending
1949 rval = fc_fcp_pkt_send(lport, fsp);
1951 fsp->state = FC_SRB_FREE;
1952 fc_fcp_pkt_release(fsp);
1953 rc = SCSI_MLQUEUE_HOST_BUSY;
1958 EXPORT_SYMBOL(fc_queuecommand);
1961 * fc_io_compl() - Handle responses for completed commands
1962 * @fsp: The FCP packet that is complete
1964 * Translates fcp_pkt errors to a Linux SCSI errors.
1965 * The fcp packet lock must be held when calling.
1967 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1969 struct fc_fcp_internal *si;
1970 struct scsi_cmnd *sc_cmd;
1971 struct fc_lport *lport;
1972 unsigned long flags;
1974 /* release outstanding ddp context */
1975 fc_fcp_ddp_done(fsp);
1977 fsp->state |= FC_SRB_COMPL;
1978 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1979 spin_unlock_bh(&fsp->scsi_pkt_lock);
1980 del_timer_sync(&fsp->timer);
1981 spin_lock_bh(&fsp->scsi_pkt_lock);
1985 si = fc_get_scsi_internal(lport);
1988 * if can_queue ramp down is done then try can_queue ramp up
1989 * since commands are completing now.
1991 if (si->last_can_queue_ramp_down_time)
1992 fc_fcp_can_queue_ramp_up(lport);
1995 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1996 switch (fsp->status_code) {
1998 if (fsp->cdb_status == 0) {
2002 sc_cmd->result = DID_OK << 16;
2003 if (fsp->scsi_resid)
2004 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
2007 * transport level I/O was ok but scsi
2008 * has non zero status
2010 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
2014 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2015 "due to FC_ERROR\n");
2016 sc_cmd->result = DID_ERROR << 16;
2018 case FC_DATA_UNDRUN:
2019 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
2021 * scsi status is good but transport level
2024 if (fsp->state & FC_SRB_RCV_STATUS) {
2025 sc_cmd->result = DID_OK << 16;
2027 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
2028 " due to FC_DATA_UNDRUN (trans)\n");
2029 sc_cmd->result = DID_ERROR << 16;
2033 * scsi got underrun, this is an error
2035 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2036 "due to FC_DATA_UNDRUN (scsi)\n");
2037 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
2038 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
2041 case FC_DATA_OVRRUN:
2043 * overrun is an error
2045 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2046 "due to FC_DATA_OVRRUN\n");
2047 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
2049 case FC_CMD_ABORTED:
2050 if (host_byte(sc_cmd->result) == DID_TIME_OUT)
2051 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml "
2052 "due to FC_CMD_ABORTED\n");
2054 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2055 "due to FC_CMD_ABORTED\n");
2056 set_host_byte(sc_cmd, DID_ERROR);
2058 sc_cmd->result |= fsp->io_status;
2061 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
2062 "due to FC_CMD_RESET\n");
2063 sc_cmd->result = (DID_RESET << 16);
2065 case FC_TRANS_RESET:
2066 FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml "
2067 "due to FC_TRANS_RESET\n");
2068 sc_cmd->result = (DID_SOFT_ERROR << 16);
2071 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
2072 "due to FC_HRD_ERROR\n");
2073 sc_cmd->result = (DID_NO_CONNECT << 16);
2076 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
2077 "due to FC_CRC_ERROR\n");
2078 sc_cmd->result = (DID_PARITY << 16);
2081 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
2082 "due to FC_TIMED_OUT\n");
2083 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
2086 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2087 "due to unknown error\n");
2088 sc_cmd->result = (DID_ERROR << 16);
2092 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
2093 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
2095 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2096 list_del(&fsp->list);
2097 sc_cmd->SCp.ptr = NULL;
2098 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2099 sc_cmd->scsi_done(sc_cmd);
2101 /* release ref from initial allocation in queue command */
2102 fc_fcp_pkt_release(fsp);
2106 * fc_eh_abort() - Abort a command
2107 * @sc_cmd: The SCSI command to abort
2109 * From SCSI host template.
2110 * Send an ABTS to the target device and wait for the response.
2112 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2114 struct fc_fcp_pkt *fsp;
2115 struct fc_lport *lport;
2116 struct fc_fcp_internal *si;
2118 unsigned long flags;
2121 rval = fc_block_scsi_eh(sc_cmd);
2125 lport = shost_priv(sc_cmd->device->host);
2126 if (lport->state != LPORT_ST_READY)
2128 else if (!lport->link_up)
2131 si = fc_get_scsi_internal(lport);
2132 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2133 fsp = CMD_SP(sc_cmd);
2135 /* command completed while scsi eh was setting up */
2136 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2139 /* grab a ref so the fsp and sc_cmd cannot be released from under us */
2140 fc_fcp_pkt_hold(fsp);
2141 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2143 if (fc_fcp_lock_pkt(fsp)) {
2144 /* completed while we were waiting for timer to be deleted */
2149 rc = fc_fcp_pkt_abort(fsp);
2150 fc_fcp_unlock_pkt(fsp);
2153 fc_fcp_pkt_release(fsp);
2156 EXPORT_SYMBOL(fc_eh_abort);
2159 * fc_eh_device_reset() - Reset a single LUN
2160 * @sc_cmd: The SCSI command which identifies the device whose
2161 * LUN is to be reset
2163 * Set from SCSI host template.
2165 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2167 struct fc_lport *lport;
2168 struct fc_fcp_pkt *fsp;
2169 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2173 rval = fc_block_scsi_eh(sc_cmd);
2177 lport = shost_priv(sc_cmd->device->host);
2179 if (lport->state != LPORT_ST_READY)
2182 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2184 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2186 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2191 * Build the libfc request pkt. Do not set the scsi cmnd, because
2192 * the sc passed in is not setup for execution like when sent
2193 * through the queuecommand callout.
2195 fsp->rport = rport; /* set the remote port ptr */
2198 * flush outstanding commands
2200 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2201 fsp->state = FC_SRB_FREE;
2202 fc_fcp_pkt_release(fsp);
2207 EXPORT_SYMBOL(fc_eh_device_reset);
2210 * fc_eh_host_reset() - Reset a Scsi_Host.
2211 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2213 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2215 struct Scsi_Host *shost = sc_cmd->device->host;
2216 struct fc_lport *lport = shost_priv(shost);
2217 unsigned long wait_tmo;
2219 FC_SCSI_DBG(lport, "Resetting host\n");
2221 fc_lport_reset(lport);
2222 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2223 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2227 if (fc_fcp_lport_queue_ready(lport)) {
2228 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2229 "on port (%6.6x)\n", lport->port_id);
2232 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2233 "port (%6.6x) is not ready.\n",
2238 EXPORT_SYMBOL(fc_eh_host_reset);
2241 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2242 * @sdev: The SCSI device that identifies the SCSI host
2244 * Configures queue depth based on host's cmd_per_len. If not set
2245 * then we use the libfc default.
2247 int fc_slave_alloc(struct scsi_device *sdev)
2249 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2251 if (!rport || fc_remote_port_chkready(rport))
2254 scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2257 EXPORT_SYMBOL(fc_slave_alloc);
2260 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2261 * @lport: The local port that no longer needs the FCP layer
2263 void fc_fcp_destroy(struct fc_lport *lport)
2265 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2267 if (!list_empty(&si->scsi_pkt_queue))
2268 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2269 "port (%6.6x)\n", lport->port_id);
2271 mempool_destroy(si->scsi_pkt_pool);
2273 lport->scsi_priv = NULL;
2275 EXPORT_SYMBOL(fc_fcp_destroy);
2277 int fc_setup_fcp(void)
2281 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2282 sizeof(struct fc_fcp_pkt),
2283 0, SLAB_HWCACHE_ALIGN, NULL);
2284 if (!scsi_pkt_cachep) {
2285 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2286 "module load failed!");
2293 void fc_destroy_fcp(void)
2295 kmem_cache_destroy(scsi_pkt_cachep);
2299 * fc_fcp_init() - Initialize the FCP layer for a local port
2300 * @lport: The local port to initialize the exchange layer for
2302 int fc_fcp_init(struct fc_lport *lport)
2305 struct fc_fcp_internal *si;
2307 if (!lport->tt.fcp_cmd_send)
2308 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2310 if (!lport->tt.fcp_cleanup)
2311 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2313 if (!lport->tt.fcp_abort_io)
2314 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2316 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2319 lport->scsi_priv = si;
2320 si->max_can_queue = lport->host->can_queue;
2321 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2322 spin_lock_init(&si->scsi_queue_lock);
2324 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2325 if (!si->scsi_pkt_pool) {
2335 EXPORT_SYMBOL(fc_fcp_init);