2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 * Maintained at www.Open-FCoE.org
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
31 #include <scsi/scsi_tcq.h>
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_cmnd.h>
37 #include <scsi/fc/fc_fc2.h>
39 #include <scsi/libfc.h>
40 #include <scsi/fc_encode.h>
42 MODULE_AUTHOR("Open-FCoE.org");
43 MODULE_DESCRIPTION("libfc");
44 MODULE_LICENSE("GPL v2");
46 unsigned int fc_debug_logging;
47 module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);
48 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
50 static struct kmem_cache *scsi_pkt_cachep;
52 /* SRB state definitions */
53 #define FC_SRB_FREE 0 /* cmd is free */
54 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
55 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
56 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
57 #define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */
58 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
59 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
60 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
61 #define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */
63 #define FC_SRB_READ (1 << 1)
64 #define FC_SRB_WRITE (1 << 0)
67 * The SCp.ptr should be tested and set under the host lock. NULL indicates
68 * that the command has been retruned to the scsi layer.
70 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
71 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
72 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
73 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
74 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
76 struct fc_fcp_internal {
77 mempool_t *scsi_pkt_pool;
78 struct list_head scsi_pkt_queue;
82 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
86 * FC scsi I/O related functions
88 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
89 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
90 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
91 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
92 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
93 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp);
94 static void fc_timeout_error(struct fc_fcp_pkt *);
95 static void fc_fcp_timeout(unsigned long data);
96 static void fc_fcp_rec(struct fc_fcp_pkt *);
97 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
98 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
99 static void fc_io_compl(struct fc_fcp_pkt *);
101 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
102 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
103 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
106 * command status codes
108 #define FC_COMPLETE 0
109 #define FC_CMD_ABORTED 1
110 #define FC_CMD_RESET 2
111 #define FC_CMD_PLOGO 3
113 #define FC_TRANS_ERR 5
114 #define FC_DATA_OVRRUN 6
115 #define FC_DATA_UNDRUN 7
117 #define FC_HRD_ERROR 9
118 #define FC_CMD_TIME_OUT 10
121 * Error recovery timeout values.
123 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
124 #define FC_SCSI_TM_TOV (10 * HZ)
125 #define FC_SCSI_REC_TOV (2 * HZ)
126 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
128 #define FC_MAX_ERROR_CNT 5
129 #define FC_MAX_RECOV_RETRY 3
131 #define FC_FCP_DFLT_QUEUE_DEPTH 32
134 * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet
135 * @lp: fc lport struct
136 * @gfp: gfp flags for allocation
138 * This is used by upper layer scsi driver.
139 * Return Value : scsi_pkt structure or null on allocation failure.
140 * Context : call from process context. no locking required.
142 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp)
144 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
145 struct fc_fcp_pkt *fsp;
147 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
149 memset(fsp, 0, sizeof(*fsp));
151 atomic_set(&fsp->ref_cnt, 1);
152 init_timer(&fsp->timer);
153 INIT_LIST_HEAD(&fsp->list);
154 spin_lock_init(&fsp->scsi_pkt_lock);
160 * fc_fcp_pkt_release() - release hold on scsi_pkt packet
161 * @fsp: fcp packet struct
163 * This is used by upper layer scsi driver.
164 * Context : call from process and interrupt context.
165 * no locking required
167 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
169 if (atomic_dec_and_test(&fsp->ref_cnt)) {
170 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
172 mempool_free(fsp, si->scsi_pkt_pool);
176 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
178 atomic_inc(&fsp->ref_cnt);
182 * fc_fcp_pkt_destory() - release hold on scsi_pkt packet
183 * @seq: exchange sequence
184 * @fsp: fcp packet struct
186 * Release hold on scsi_pkt packet set to keep scsi_pkt
187 * till EM layer exch resource is not freed.
188 * Context : called from from EM layer.
189 * no locking required
191 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
193 fc_fcp_pkt_release(fsp);
197 * fc_fcp_lock_pkt() - lock a packet and get a ref to it.
200 * We should only return error if we return a command to scsi-ml before
201 * getting a response. This can happen in cases where we send a abort, but
202 * do not wait for the response and the abort and command can be passing
203 * each other on the wire/network-layer.
205 * Note: this function locks the packet and gets a reference to allow
206 * callers to call the completion function while the lock is held and
207 * not have to worry about the packets refcount.
209 * TODO: Maybe we should just have callers grab/release the lock and
210 * have a function that they call to verify the fsp and grab a ref if
213 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
215 spin_lock_bh(&fsp->scsi_pkt_lock);
216 if (fsp->state & FC_SRB_COMPL) {
217 spin_unlock_bh(&fsp->scsi_pkt_lock);
221 fc_fcp_pkt_hold(fsp);
225 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
227 spin_unlock_bh(&fsp->scsi_pkt_lock);
228 fc_fcp_pkt_release(fsp);
231 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
233 if (!(fsp->state & FC_SRB_COMPL))
234 mod_timer(&fsp->timer, jiffies + delay);
237 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
242 fsp->state |= FC_SRB_ABORT_PENDING;
243 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
248 * An abort isn't needed.
250 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
253 fsp->lp->tt.exch_done(fsp->seq_ptr);
257 fsp->state &= ~FC_SRB_ABORT_PENDING;
259 fsp->status_code = FC_ERROR;
260 fc_fcp_complete_locked(fsp);
264 * fc_fcp_ddp_setup - calls to LLD's ddp_setup to set up DDP
265 * transfer for a read I/O indicated by the fc_fcp_pkt.
266 * @fsp: ptr to the fc_fcp_pkt
268 * This is called in exch_seq_send() when we have a newly allocated
269 * exchange with a valid exchange id to setup ddp.
273 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
281 if ((fsp->req_flags & FC_SRB_READ) &&
282 (lp->lro_enabled) && (lp->tt.ddp_setup)) {
283 if (lp->tt.ddp_setup(lp, xid, scsi_sglist(fsp->cmd),
284 scsi_sg_count(fsp->cmd)))
290 * fc_fcp_ddp_done - calls to LLD's ddp_done to release any
291 * DDP related resources for this I/O if it is initialized
293 * @fsp: ptr to the fc_fcp_pkt
297 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
304 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
308 if (lp->tt.ddp_done) {
309 fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp);
310 fsp->xfer_ddp = FC_XID_UNKNOWN;
316 * Receive SCSI data from target.
317 * Called after receiving solicited data.
319 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
321 struct scsi_cmnd *sc = fsp->cmd;
322 struct fc_lport *lp = fsp->lp;
323 struct fcoe_dev_stats *stats;
324 struct fc_frame_header *fh;
331 struct scatterlist *sg;
334 fh = fc_frame_header_get(fp);
335 offset = ntohl(fh->fh_parm_offset);
336 start_offset = offset;
337 len = fr_len(fp) - sizeof(*fh);
338 buf = fc_frame_payload_get(fp, 0);
340 /* if this I/O is ddped, update xfer len */
341 fc_fcp_ddp_done(fsp);
343 if (offset + len > fsp->data_len) {
344 /* this should never happen */
345 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
346 fc_frame_crc_check(fp))
348 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
349 "data_len %x\n", len, offset, fsp->data_len);
350 fc_fcp_retry_cmd(fsp);
353 if (offset != fsp->xfer_len)
354 fsp->state |= FC_SRB_DISCONTIG;
357 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
358 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
360 sg = scsi_sglist(sc);
363 while (remaining > 0 && sg) {
368 if (offset >= sg->length) {
369 offset -= sg->length;
373 sg_bytes = min(remaining, sg->length - offset);
376 * The scatterlist item may be bigger than PAGE_SIZE,
377 * but we are limited to mapping PAGE_SIZE at a time.
379 off = offset + sg->offset;
380 sg_bytes = min(sg_bytes, (size_t)
381 (PAGE_SIZE - (off & ~PAGE_MASK)));
382 page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
385 break; /* XXX panic? */
387 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
388 crc = crc32(crc, buf, sg_bytes);
389 memcpy((char *)page_addr + (off & ~PAGE_MASK), buf,
392 kunmap_atomic(page_addr, KM_SOFTIRQ0);
395 remaining -= sg_bytes;
396 copy_len += sg_bytes;
399 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
400 buf = fc_frame_payload_get(fp, 0);
402 crc = crc32(crc, buf + len, 4 - (len % 4));
403 len += 4 - (len % 4);
406 if (~crc != le32_to_cpu(fr_crc(fp))) {
408 stats = fc_lport_get_stats(lp);
409 stats->ErrorFrames++;
410 /* FIXME - per cpu count, not total count! */
411 if (stats->InvalidCRCCount++ < 5)
412 printk(KERN_WARNING "libfc: CRC error on data "
413 "frame for port (%6x)\n",
414 fc_host_port_id(lp->host));
416 * Assume the frame is total garbage.
417 * We may have copied it over the good part
419 * If so, we need to retry the entire operation.
420 * Otherwise, ignore it.
422 if (fsp->state & FC_SRB_DISCONTIG)
423 fc_fcp_retry_cmd(fsp);
428 if (fsp->xfer_contig_end == start_offset)
429 fsp->xfer_contig_end += copy_len;
430 fsp->xfer_len += copy_len;
433 * In the very rare event that this data arrived after the response
434 * and completes the transfer, call the completion handler.
436 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
437 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
438 fc_fcp_complete_locked(fsp);
442 * fc_fcp_send_data() - Send SCSI data to target.
443 * @fsp: ptr to fc_fcp_pkt
444 * @sp: ptr to this sequence
445 * @offset: starting offset for this data request
446 * @seq_blen: the burst length for this data request
448 * Called after receiving a Transfer Ready data descriptor.
449 * if LLD is capable of seq offload then send down seq_blen
450 * size of data in single frame, otherwise send multiple FC
451 * frames of max FC frame payload supported by target port.
453 * Returns : 0 for success.
455 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
456 size_t offset, size_t seq_blen)
459 struct scsi_cmnd *sc;
460 struct scatterlist *sg;
461 struct fc_frame *fp = NULL;
462 struct fc_lport *lp = fsp->lp;
467 size_t frame_offset, fh_parm_offset;
471 int using_sg = lp->sg_supp;
474 WARN_ON(seq_blen <= 0);
475 if (unlikely(offset + seq_blen > fsp->data_len)) {
476 /* this should never happen */
477 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
478 "offset %zx\n", seq_blen, offset);
479 fc_fcp_send_abort(fsp);
481 } else if (offset != fsp->xfer_len) {
482 /* Out of Order Data Request - no problem, but unexpected. */
483 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
484 "seq_blen %zx offset %zx\n", seq_blen, offset);
488 * if LLD is capable of seq_offload then set transport
489 * burst length (t_blen) to seq_blen, otherwise set t_blen
490 * to max FC frame payload previously set in fsp->max_payload.
492 t_blen = fsp->max_payload;
493 if (lp->seq_offload) {
494 t_blen = min(seq_blen, (size_t)lp->lso_max);
495 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
496 fsp, seq_blen, lp->lso_max, t_blen);
499 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
501 t_blen &= ~(512 - 1); /* round down to block size */
502 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
505 remaining = seq_blen;
506 fh_parm_offset = frame_offset = offset;
508 seq = lp->tt.seq_start_next(seq);
509 f_ctl = FC_FC_REL_OFF;
512 sg = scsi_sglist(sc);
514 while (remaining > 0 && sg) {
515 if (offset >= sg->length) {
516 offset -= sg->length;
521 tlen = min(t_blen, remaining);
524 * TODO. Temporary workaround. fc_seq_send() can't
525 * handle odd lengths in non-linear skbs.
526 * This will be the final fragment only.
531 fp = _fc_frame_alloc(lp, 0);
535 fp = fc_frame_alloc(lp, tlen);
539 data = (void *)(fr_hdr(fp)) +
540 sizeof(struct fc_frame_header);
542 fh_parm_offset = frame_offset;
543 fr_max_payload(fp) = fsp->max_payload;
545 sg_bytes = min(tlen, sg->length - offset);
547 get_page(sg_page(sg));
548 skb_fill_page_desc(fp_skb(fp),
549 skb_shinfo(fp_skb(fp))->nr_frags,
550 sg_page(sg), sg->offset + offset,
552 fp_skb(fp)->data_len += sg_bytes;
553 fr_len(fp) += sg_bytes;
554 fp_skb(fp)->truesize += PAGE_SIZE;
556 size_t off = offset + sg->offset;
559 * The scatterlist item may be bigger than PAGE_SIZE,
560 * but we must not cross pages inside the kmap.
562 sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE -
563 (off & ~PAGE_MASK)));
564 page_addr = kmap_atomic(sg_page(sg) +
567 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
569 kunmap_atomic(page_addr, KM_SOFTIRQ0);
573 frame_offset += sg_bytes;
575 remaining -= sg_bytes;
577 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
582 * Send sequence with transfer sequence initiative in case
583 * this is last FCP frame of the sequence.
586 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
588 ep = fc_seq_exch(seq);
589 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
590 FC_TYPE_FCP, f_ctl, fh_parm_offset);
593 * send fragment using for a sequence.
595 error = lp->tt.seq_send(lp, seq, fp);
597 WARN_ON(1); /* send error should be rare */
598 fc_fcp_retry_cmd(fsp);
603 fsp->xfer_len += seq_blen; /* premature count? */
607 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
610 struct fc_ba_rjt *brp;
611 struct fc_frame_header *fh;
613 fh = fc_frame_header_get(fp);
614 switch (fh->fh_r_ctl) {
618 brp = fc_frame_payload_get(fp, sizeof(*brp));
619 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
624 * we will let the command timeout
625 * and scsi-ml recover in this case,
626 * therefore cleared the ba_done flag.
632 fsp->state |= FC_SRB_ABORTED;
633 fsp->state &= ~FC_SRB_ABORT_PENDING;
635 if (fsp->wait_for_comp)
636 complete(&fsp->tm_done);
638 fc_fcp_complete_locked(fsp);
643 * fc_fcp_reduce_can_queue() - drop can_queue
644 * @lp: lport to drop queueing for
646 * If we are getting memory allocation failures, then we may
647 * be trying to execute too many commands. We let the running
648 * commands complete or timeout, then try again with a reduced
649 * can_queue. Eventually we will hit the point where we run
650 * on all reserved structs.
652 static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
654 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
658 spin_lock_irqsave(lp->host->host_lock, flags);
663 can_queue = lp->host->can_queue;
667 lp->host->can_queue = can_queue;
668 shost_printk(KERN_ERR, lp->host, "libfc: Could not allocate frame.\n"
669 "Reducing can_queue to %d.\n", can_queue);
671 spin_unlock_irqrestore(lp->host->host_lock, flags);
675 * fc_fcp_recv() - Reveive FCP frames
676 * @seq: The sequence the frame is on
678 * @arg: The related FCP packet
681 * Context : called from Soft IRQ context
682 * can not called holding list lock
684 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
686 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
687 struct fc_lport *lport = fsp->lp;
688 struct fc_frame_header *fh;
689 struct fcp_txrdy *dd;
696 fh = fc_frame_header_get(fp);
697 r_ctl = fh->fh_r_ctl;
699 if (!(lport->state & LPORT_ST_READY))
701 if (fc_fcp_lock_pkt(fsp))
703 fsp->last_pkt_time = jiffies;
705 if (fh->fh_type == FC_TYPE_BLS) {
706 fc_fcp_abts_resp(fsp, fp);
710 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
713 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
715 * received XFER RDY from the target
716 * need to send data to the target
718 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
719 dd = fc_frame_payload_get(fp, sizeof(*dd));
722 rc = fc_fcp_send_data(fsp, seq,
723 (size_t) ntohl(dd->ft_data_ro),
724 (size_t) ntohl(dd->ft_burst_len));
726 seq->rec_data = fsp->xfer_len;
727 else if (rc == -ENOMEM)
728 fsp->state |= FC_SRB_NOMEM;
729 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
731 * received a DATA frame
732 * next we will copy the data to the system buffer
734 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
735 fc_fcp_recv_data(fsp, fp);
736 seq->rec_data = fsp->xfer_contig_end;
737 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
738 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
740 fc_fcp_resp(fsp, fp);
742 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
745 fc_fcp_unlock_pkt(fsp);
750 fc_fcp_error(fsp, fp);
751 else if (rc == -ENOMEM)
752 fc_fcp_reduce_can_queue(lport);
755 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
757 struct fc_frame_header *fh;
758 struct fcp_resp *fc_rp;
759 struct fcp_resp_ext *rp_ex;
760 struct fcp_resp_rsp_info *fc_rp_info;
768 fh = (struct fc_frame_header *)fr_hdr(fp);
769 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
772 fc_rp = (struct fcp_resp *)(fh + 1);
773 fsp->cdb_status = fc_rp->fr_status;
774 flags = fc_rp->fr_flags;
775 fsp->scsi_comp_flags = flags;
776 expected_len = fsp->data_len;
778 /* if ddp, update xfer len */
779 fc_fcp_ddp_done(fsp);
781 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
782 rp_ex = (void *)(fc_rp + 1);
783 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
784 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
786 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
787 if (flags & FCP_RSP_LEN_VAL) {
788 respl = ntohl(rp_ex->fr_rsp_len);
789 if (respl != sizeof(*fc_rp_info))
791 if (fsp->wait_for_comp) {
792 /* Abuse cdb_status for rsp code */
793 fsp->cdb_status = fc_rp_info->rsp_code;
794 complete(&fsp->tm_done);
796 * tmfs will not have any scsi cmd so
803 if (flags & FCP_SNS_LEN_VAL) {
804 snsl = ntohl(rp_ex->fr_sns_len);
805 if (snsl > SCSI_SENSE_BUFFERSIZE)
806 snsl = SCSI_SENSE_BUFFERSIZE;
807 memcpy(fsp->cmd->sense_buffer,
808 (char *)fc_rp_info + respl, snsl);
811 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
812 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
814 if (flags & FCP_RESID_UNDER) {
815 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
817 * The cmnd->underflow is the minimum number of
818 * bytes that must be transfered for this
819 * command. Provided a sense condition is not
820 * present, make sure the actual amount
821 * transferred is at least the underflow value
824 if (!(flags & FCP_SNS_LEN_VAL) &&
825 (fc_rp->fr_status == 0) &&
826 (scsi_bufflen(fsp->cmd) -
827 fsp->scsi_resid) < fsp->cmd->underflow)
829 expected_len -= fsp->scsi_resid;
831 fsp->status_code = FC_ERROR;
835 fsp->state |= FC_SRB_RCV_STATUS;
838 * Check for missing or extra data frames.
840 if (unlikely(fsp->xfer_len != expected_len)) {
841 if (fsp->xfer_len < expected_len) {
843 * Some data may be queued locally,
844 * Wait a at least one jiffy to see if it is delivered.
845 * If this expires without data, we may do SRR.
847 fc_fcp_timer_set(fsp, 2);
850 fsp->status_code = FC_DATA_OVRRUN;
851 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, "
852 "len %x, data len %x\n",
854 fsp->xfer_len, expected_len, fsp->data_len);
856 fc_fcp_complete_locked(fsp);
860 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
861 "snsl %u\n", flags, fr_len(fp), respl, snsl);
863 fsp->status_code = FC_ERROR;
864 fc_fcp_complete_locked(fsp);
868 * fc_fcp_complete_locked() - complete processing of a fcp packet
871 * This function may sleep if a timer is pending. The packet lock must be
872 * held, and the host lock must not be held.
874 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
876 struct fc_lport *lp = fsp->lp;
881 if (fsp->state & FC_SRB_ABORT_PENDING)
884 if (fsp->state & FC_SRB_ABORTED) {
885 if (!fsp->status_code)
886 fsp->status_code = FC_CMD_ABORTED;
889 * Test for transport underrun, independent of response
892 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
893 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
894 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
895 fsp->status_code = FC_DATA_UNDRUN;
903 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
904 struct fc_frame *conf_frame;
907 csp = lp->tt.seq_start_next(seq);
908 conf_frame = fc_frame_alloc(fsp->lp, 0);
910 f_ctl = FC_FC_SEQ_INIT;
911 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
912 ep = fc_seq_exch(seq);
913 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
915 FC_TYPE_FCP, f_ctl, 0);
916 lp->tt.seq_send(lp, csp, conf_frame);
919 lp->tt.exch_done(seq);
924 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
926 struct fc_lport *lp = fsp->lp;
929 lp->tt.exch_done(fsp->seq_ptr);
932 fsp->status_code = error;
936 * fc_fcp_cleanup_each_cmd() - Cleanup active commads
940 * @error: fsp status code
942 * If lun or id is -1, they are ignored.
944 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
945 unsigned int lun, int error)
947 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
948 struct fc_fcp_pkt *fsp;
949 struct scsi_cmnd *sc_cmd;
952 spin_lock_irqsave(lp->host->host_lock, flags);
954 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
956 if (id != -1 && scmd_id(sc_cmd) != id)
959 if (lun != -1 && sc_cmd->device->lun != lun)
962 fc_fcp_pkt_hold(fsp);
963 spin_unlock_irqrestore(lp->host->host_lock, flags);
965 if (!fc_fcp_lock_pkt(fsp)) {
966 fc_fcp_cleanup_cmd(fsp, error);
968 fc_fcp_unlock_pkt(fsp);
971 fc_fcp_pkt_release(fsp);
972 spin_lock_irqsave(lp->host->host_lock, flags);
974 * while we dropped the lock multiple pkts could
975 * have been released, so we have to start over.
979 spin_unlock_irqrestore(lp->host->host_lock, flags);
982 static void fc_fcp_abort_io(struct fc_lport *lp)
984 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
988 * fc_fcp_pkt_send() - send a fcp packet to the lower level.
992 * This is called by upper layer protocol.
993 * Return : zero for success and -1 for failure
994 * Context : called from queuecommand which can be called from process
996 * Locks : called with the host lock and irqs disabled.
998 static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
1000 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
1003 fsp->cmd->SCp.ptr = (char *)fsp;
1004 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1005 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1007 int_to_scsilun(fsp->cmd->device->lun,
1008 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1009 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1010 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1012 spin_unlock_irq(lp->host->host_lock);
1013 rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv);
1014 spin_lock_irq(lp->host->host_lock);
1016 list_del(&fsp->list);
1021 static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1022 void (*resp)(struct fc_seq *,
1023 struct fc_frame *fp,
1026 struct fc_frame *fp;
1028 struct fc_rport *rport;
1029 struct fc_rport_libfc_priv *rp;
1030 const size_t len = sizeof(fsp->cdb_cmd);
1033 if (fc_fcp_lock_pkt(fsp))
1036 fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
1042 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1045 fsp->max_payload = rport->maxframe_size;
1046 rp = rport->dd_data;
1048 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1049 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1050 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1052 seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1057 fsp->last_pkt_time = jiffies;
1059 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1061 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1062 fc_fcp_timer_set(fsp,
1063 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1064 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1066 fc_fcp_unlock_pkt(fsp);
1071 * transport error handler
1073 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1075 int error = PTR_ERR(fp);
1077 if (fc_fcp_lock_pkt(fsp))
1080 if (error == -FC_EX_CLOSED) {
1081 fc_fcp_retry_cmd(fsp);
1086 * clear abort pending, because the lower layer
1087 * decided to force completion.
1089 fsp->state &= ~FC_SRB_ABORT_PENDING;
1090 fsp->status_code = FC_CMD_PLOGO;
1091 fc_fcp_complete_locked(fsp);
1093 fc_fcp_unlock_pkt(fsp);
1097 * Scsi abort handler- calls to send an abort
1098 * and then wait for abort completion
1100 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1104 if (fc_fcp_send_abort(fsp))
1107 init_completion(&fsp->tm_done);
1108 fsp->wait_for_comp = 1;
1110 spin_unlock_bh(&fsp->scsi_pkt_lock);
1111 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1112 spin_lock_bh(&fsp->scsi_pkt_lock);
1113 fsp->wait_for_comp = 0;
1116 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1118 } else if (fsp->state & FC_SRB_ABORTED) {
1119 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1121 fc_fcp_complete_locked(fsp);
1128 * Retry LUN reset after resource allocation failed.
1130 static void fc_lun_reset_send(unsigned long data)
1132 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1133 struct fc_lport *lp = fsp->lp;
1134 if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) {
1135 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1137 if (fc_fcp_lock_pkt(fsp))
1139 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1140 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1141 fc_fcp_unlock_pkt(fsp);
1146 * Scsi device reset handler- send a LUN RESET to the device
1147 * and wait for reset reply
1149 static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1150 unsigned int id, unsigned int lun)
1154 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1155 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1156 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1158 fsp->wait_for_comp = 1;
1159 init_completion(&fsp->tm_done);
1161 fc_lun_reset_send((unsigned long)fsp);
1164 * wait for completion of reset
1165 * after that make sure all commands are terminated
1167 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1169 spin_lock_bh(&fsp->scsi_pkt_lock);
1170 fsp->state |= FC_SRB_COMPL;
1171 spin_unlock_bh(&fsp->scsi_pkt_lock);
1173 del_timer_sync(&fsp->timer);
1175 spin_lock_bh(&fsp->scsi_pkt_lock);
1177 lp->tt.exch_done(fsp->seq_ptr);
1178 fsp->seq_ptr = NULL;
1180 fsp->wait_for_comp = 0;
1181 spin_unlock_bh(&fsp->scsi_pkt_lock);
1184 FC_SCSI_DBG(lp, "lun reset failed\n");
1188 /* cdb_status holds the tmf's rsp code */
1189 if (fsp->cdb_status != FCP_TMF_CMPL)
1192 FC_SCSI_DBG(lp, "lun reset to lun %u completed\n", lun);
1193 fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED);
1198 * Task Managment response handler
1200 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1202 struct fc_fcp_pkt *fsp = arg;
1203 struct fc_frame_header *fh;
1207 * If there is an error just let it timeout or wait
1208 * for TMF to be aborted if it timedout.
1210 * scsi-eh will escalate for when either happens.
1215 if (fc_fcp_lock_pkt(fsp))
1219 * raced with eh timeout handler.
1221 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1222 spin_unlock_bh(&fsp->scsi_pkt_lock);
1226 fh = fc_frame_header_get(fp);
1227 if (fh->fh_type != FC_TYPE_BLS)
1228 fc_fcp_resp(fsp, fp);
1229 fsp->seq_ptr = NULL;
1230 fsp->lp->tt.exch_done(seq);
1232 fc_fcp_unlock_pkt(fsp);
1235 static void fc_fcp_cleanup(struct fc_lport *lp)
1237 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
1241 * fc_fcp_timeout: called by OS timer function.
1243 * The timer has been inactivated and must be reactivated if desired
1244 * using fc_fcp_timer_set().
1248 * If REC is supported, just issue it, and return. The REC exchange will
1249 * complete or time out, and recovery can continue at that point.
1251 * Otherwise, if the response has been received without all the data,
1252 * it has been ER_TIMEOUT since the response was received.
1254 * If the response has not been received,
1255 * we see if data was received recently. If it has been, we continue waiting,
1256 * otherwise, we abort the command.
1258 static void fc_fcp_timeout(unsigned long data)
1260 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1261 struct fc_rport *rport = fsp->rport;
1262 struct fc_rport_libfc_priv *rp = rport->dd_data;
1264 if (fc_fcp_lock_pkt(fsp))
1267 if (fsp->cdb_cmd.fc_tm_flags)
1270 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1272 if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
1274 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1276 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1277 else if (fsp->state & FC_SRB_RCV_STATUS)
1278 fc_fcp_complete_locked(fsp);
1280 fc_timeout_error(fsp);
1281 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1283 fc_fcp_unlock_pkt(fsp);
1287 * Send a REC ELS request
1289 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1291 struct fc_lport *lp;
1292 struct fc_frame *fp;
1293 struct fc_rport *rport;
1294 struct fc_rport_libfc_priv *rp;
1298 rp = rport->dd_data;
1299 if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) {
1300 fsp->status_code = FC_HRD_ERROR;
1302 fc_fcp_complete_locked(fsp);
1305 fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec));
1309 fr_seq(fp) = fsp->seq_ptr;
1310 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1311 fc_host_port_id(rp->local_port->host), FC_TYPE_ELS,
1312 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1313 if (lp->tt.elsct_send(lp, rport->port_id, fp, ELS_REC, fc_fcp_rec_resp,
1314 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1315 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1319 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1320 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1322 fc_timeout_error(fsp);
1326 * Receive handler for REC ELS frame
1327 * if it is a reject then let the scsi layer to handle
1328 * the timeout. if it is a LS_ACC then if the io was not completed
1329 * then set the timeout and return otherwise complete the exchange
1330 * and tell the scsi layer to restart the I/O.
1332 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1334 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1335 struct fc_els_rec_acc *recp;
1336 struct fc_els_ls_rjt *rjt;
1340 enum dma_data_direction data_dir;
1342 struct fc_rport_libfc_priv *rp;
1345 fc_fcp_rec_error(fsp, fp);
1349 if (fc_fcp_lock_pkt(fsp))
1352 fsp->recov_retry = 0;
1353 opcode = fc_frame_payload_op(fp);
1354 if (opcode == ELS_LS_RJT) {
1355 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1356 switch (rjt->er_reason) {
1358 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1359 "reason %d expl %d\n",
1360 fsp->rport->port_id, rjt->er_reason,
1364 FC_FCP_DBG(fsp, "device does not support REC\n");
1365 rp = fsp->rport->dd_data;
1367 * if we do not spport RECs or got some bogus
1368 * reason then resetup timer so we check for
1371 rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1372 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1377 * If no data transfer, the command frame got dropped
1378 * so we just retry. If data was transferred, we
1379 * lost the response but the target has no record,
1380 * so we abort and retry.
1382 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1383 fsp->xfer_len == 0) {
1384 fc_fcp_retry_cmd(fsp);
1387 fc_timeout_error(fsp);
1390 } else if (opcode == ELS_LS_ACC) {
1391 if (fsp->state & FC_SRB_ABORTED)
1394 data_dir = fsp->cmd->sc_data_direction;
1395 recp = fc_frame_payload_get(fp, sizeof(*recp));
1396 offset = ntohl(recp->reca_fc4value);
1397 e_stat = ntohl(recp->reca_e_stat);
1399 if (e_stat & ESB_ST_COMPLETE) {
1402 * The exchange is complete.
1404 * For output, we must've lost the response.
1405 * For input, all data must've been sent.
1406 * We lost may have lost the response
1407 * (and a confirmation was requested) and maybe
1410 * If all data received, send SRR
1411 * asking for response. If partial data received,
1412 * or gaps, SRR requests data at start of gap.
1413 * Recovery via SRR relies on in-order-delivery.
1415 if (data_dir == DMA_TO_DEVICE) {
1416 r_ctl = FC_RCTL_DD_CMD_STATUS;
1417 } else if (fsp->xfer_contig_end == offset) {
1418 r_ctl = FC_RCTL_DD_CMD_STATUS;
1420 offset = fsp->xfer_contig_end;
1421 r_ctl = FC_RCTL_DD_SOL_DATA;
1423 fc_fcp_srr(fsp, r_ctl, offset);
1424 } else if (e_stat & ESB_ST_SEQ_INIT) {
1427 * The remote port has the initiative, so just
1428 * keep waiting for it to complete.
1430 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1434 * The exchange is incomplete, we have seq. initiative.
1435 * Lost response with requested confirmation,
1436 * lost confirmation, lost transfer ready or
1439 * For output, if not all data was received, ask
1440 * for transfer ready to be repeated.
1442 * If we received or sent all the data, send SRR to
1445 * If we lost a response, we may have lost some read
1448 r_ctl = FC_RCTL_DD_SOL_DATA;
1449 if (data_dir == DMA_TO_DEVICE) {
1450 r_ctl = FC_RCTL_DD_CMD_STATUS;
1451 if (offset < fsp->data_len)
1452 r_ctl = FC_RCTL_DD_DATA_DESC;
1453 } else if (offset == fsp->xfer_contig_end) {
1454 r_ctl = FC_RCTL_DD_CMD_STATUS;
1455 } else if (fsp->xfer_contig_end < offset) {
1456 offset = fsp->xfer_contig_end;
1458 fc_fcp_srr(fsp, r_ctl, offset);
1462 fc_fcp_unlock_pkt(fsp);
1464 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1469 * Handle error response or timeout for REC exchange.
1471 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1473 int error = PTR_ERR(fp);
1475 if (fc_fcp_lock_pkt(fsp))
1480 fc_fcp_retry_cmd(fsp);
1484 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
1485 fsp, fsp->rport->port_id, error);
1486 fsp->status_code = FC_CMD_PLOGO;
1489 case -FC_EX_TIMEOUT:
1491 * Assume REC or LS_ACC was lost.
1492 * The exchange manager will have aborted REC, so retry.
1494 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n",
1495 fsp->rport->port_id, error, fsp->recov_retry,
1496 FC_MAX_RECOV_RETRY);
1497 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1500 fc_timeout_error(fsp);
1503 fc_fcp_unlock_pkt(fsp);
1505 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1509 * Time out error routine:
1510 * abort's the I/O close the exchange and
1511 * send completion notification to scsi layer
1513 static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1515 fsp->status_code = FC_CMD_TIME_OUT;
1516 fsp->cdb_status = 0;
1519 * if this fails then we let the scsi command timer fire and
1522 fc_fcp_send_abort(fsp);
1526 * Sequence retransmission request.
1527 * This is called after receiving status but insufficient data, or
1528 * when expecting status but the request has timed out.
1530 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1532 struct fc_lport *lp = fsp->lp;
1533 struct fc_rport *rport;
1534 struct fc_rport_libfc_priv *rp;
1535 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1537 struct fcp_srr *srr;
1538 struct fc_frame *fp;
1542 rp = rport->dd_data;
1543 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1545 if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
1546 goto retry; /* shouldn't happen */
1547 fp = fc_frame_alloc(lp, sizeof(*srr));
1551 srr = fc_frame_payload_get(fp, sizeof(*srr));
1552 memset(srr, 0, sizeof(*srr));
1553 srr->srr_op = ELS_SRR;
1554 srr->srr_ox_id = htons(ep->oxid);
1555 srr->srr_rx_id = htons(ep->rxid);
1556 srr->srr_r_ctl = r_ctl;
1557 srr->srr_rel_off = htonl(offset);
1559 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1560 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1561 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1563 seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL,
1564 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1568 fsp->recov_seq = seq;
1569 fsp->xfer_len = offset;
1570 fsp->xfer_contig_end = offset;
1571 fsp->state &= ~FC_SRB_RCV_STATUS;
1572 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1575 fc_fcp_retry_cmd(fsp);
1579 * Handle response from SRR.
1581 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1583 struct fc_fcp_pkt *fsp = arg;
1584 struct fc_frame_header *fh;
1587 fc_fcp_srr_error(fsp, fp);
1591 if (fc_fcp_lock_pkt(fsp))
1594 fh = fc_frame_header_get(fp);
1596 * BUG? fc_fcp_srr_error calls exch_done which would release
1597 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1598 * then fc_exch_timeout would be sending an abort. The exch_done
1599 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1600 * an abort response though.
1602 if (fh->fh_type == FC_TYPE_BLS) {
1603 fc_fcp_unlock_pkt(fsp);
1607 fsp->recov_seq = NULL;
1608 switch (fc_frame_payload_op(fp)) {
1610 fsp->recov_retry = 0;
1611 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1615 fc_timeout_error(fsp);
1618 fc_fcp_unlock_pkt(fsp);
1619 fsp->lp->tt.exch_done(seq);
1622 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1625 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1627 if (fc_fcp_lock_pkt(fsp))
1629 fsp->lp->tt.exch_done(fsp->recov_seq);
1630 fsp->recov_seq = NULL;
1631 switch (PTR_ERR(fp)) {
1632 case -FC_EX_TIMEOUT:
1633 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1636 fc_timeout_error(fsp);
1638 case -FC_EX_CLOSED: /* e.g., link failure */
1641 fc_fcp_retry_cmd(fsp);
1644 fc_fcp_unlock_pkt(fsp);
1646 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1649 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
1652 return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull;
1656 * fc_queuecommand - The queuecommand function of the scsi template
1657 * @cmd: struct scsi_cmnd to be executed
1658 * @done: Callback function to be called when cmd is completed
1660 * this is the i/o strategy routine, called by the scsi layer
1661 * this routine is called with holding the host_lock.
1663 int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1665 struct fc_lport *lp;
1666 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1667 struct fc_fcp_pkt *fsp;
1668 struct fc_rport_libfc_priv *rp;
1671 struct fcoe_dev_stats *stats;
1673 lp = shost_priv(sc_cmd->device->host);
1675 rval = fc_remote_port_chkready(rport);
1677 sc_cmd->result = rval;
1682 if (!*(struct fc_remote_port **)rport->dd_data) {
1684 * rport is transitioning from blocked/deleted to
1687 sc_cmd->result = DID_IMM_RETRY << 16;
1692 rp = rport->dd_data;
1694 if (!fc_fcp_lport_queue_ready(lp)) {
1695 rc = SCSI_MLQUEUE_HOST_BUSY;
1699 fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
1701 rc = SCSI_MLQUEUE_HOST_BUSY;
1706 * build the libfc request pkt
1708 fsp->cmd = sc_cmd; /* save the cmd */
1709 fsp->lp = lp; /* save the softc ptr */
1710 fsp->rport = rport; /* set the remote port ptr */
1711 fsp->xfer_ddp = FC_XID_UNKNOWN;
1712 sc_cmd->scsi_done = done;
1715 * set up the transfer length
1717 fsp->data_len = scsi_bufflen(sc_cmd);
1721 * setup the data direction
1723 stats = fc_lport_get_stats(lp);
1724 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1725 fsp->req_flags = FC_SRB_READ;
1726 stats->InputRequests++;
1727 stats->InputMegabytes = fsp->data_len;
1728 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1729 fsp->req_flags = FC_SRB_WRITE;
1730 stats->OutputRequests++;
1731 stats->OutputMegabytes = fsp->data_len;
1734 stats->ControlRequests++;
1737 fsp->tgt_flags = rp->flags;
1739 init_timer(&fsp->timer);
1740 fsp->timer.data = (unsigned long)fsp;
1743 * send it to the lower layer
1744 * if we get -1 return then put the request in the pending
1747 rval = fc_fcp_pkt_send(lp, fsp);
1749 fsp->state = FC_SRB_FREE;
1750 fc_fcp_pkt_release(fsp);
1751 rc = SCSI_MLQUEUE_HOST_BUSY;
1756 EXPORT_SYMBOL(fc_queuecommand);
1759 * fc_io_compl() - Handle responses for completed commands
1762 * Translates a error to a Linux SCSI error.
1764 * The fcp packet lock must be held when calling.
1766 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1768 struct fc_fcp_internal *si;
1769 struct scsi_cmnd *sc_cmd;
1770 struct fc_lport *lp;
1771 unsigned long flags;
1773 /* release outstanding ddp context */
1774 fc_fcp_ddp_done(fsp);
1776 fsp->state |= FC_SRB_COMPL;
1777 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1778 spin_unlock_bh(&fsp->scsi_pkt_lock);
1779 del_timer_sync(&fsp->timer);
1780 spin_lock_bh(&fsp->scsi_pkt_lock);
1784 si = fc_get_scsi_internal(lp);
1785 spin_lock_irqsave(lp->host->host_lock, flags);
1787 spin_unlock_irqrestore(lp->host->host_lock, flags);
1792 * if a command timed out while we had to try and throttle IO
1793 * and it is now getting cleaned up, then we are about to
1794 * try again so clear the throttled flag incase we get more
1797 if (si->throttled && fsp->state & FC_SRB_NOMEM)
1803 if (!sc_cmd->SCp.ptr) {
1804 spin_unlock_irqrestore(lp->host->host_lock, flags);
1808 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1809 switch (fsp->status_code) {
1811 if (fsp->cdb_status == 0) {
1815 sc_cmd->result = DID_OK << 16;
1816 if (fsp->scsi_resid)
1817 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1818 } else if (fsp->cdb_status == QUEUE_FULL) {
1819 struct scsi_device *tmp_sdev;
1820 struct scsi_device *sdev = sc_cmd->device;
1822 shost_for_each_device(tmp_sdev, sdev->host) {
1823 if (tmp_sdev->id != sdev->id)
1826 if (tmp_sdev->queue_depth > 1) {
1827 scsi_track_queue_full(tmp_sdev,
1832 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1835 * transport level I/O was ok but scsi
1836 * has non zero status
1838 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1842 sc_cmd->result = DID_ERROR << 16;
1844 case FC_DATA_UNDRUN:
1845 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1847 * scsi status is good but transport level
1850 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ?
1851 DID_OK : DID_ERROR) << 16;
1854 * scsi got underrun, this is an error
1856 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1857 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1860 case FC_DATA_OVRRUN:
1862 * overrun is an error
1864 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1866 case FC_CMD_ABORTED:
1867 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1869 case FC_CMD_TIME_OUT:
1870 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1873 sc_cmd->result = (DID_RESET << 16);
1876 sc_cmd->result = (DID_NO_CONNECT << 16);
1879 sc_cmd->result = (DID_ERROR << 16);
1883 list_del(&fsp->list);
1884 sc_cmd->SCp.ptr = NULL;
1885 sc_cmd->scsi_done(sc_cmd);
1886 spin_unlock_irqrestore(lp->host->host_lock, flags);
1888 /* release ref from initial allocation in queue command */
1889 fc_fcp_pkt_release(fsp);
1893 * fc_fcp_complete() - complete processing of a fcp packet
1896 * This function may sleep if a fsp timer is pending.
1897 * The host lock must not be held by caller.
1899 void fc_fcp_complete(struct fc_fcp_pkt *fsp)
1901 if (fc_fcp_lock_pkt(fsp))
1904 fc_fcp_complete_locked(fsp);
1905 fc_fcp_unlock_pkt(fsp);
1907 EXPORT_SYMBOL(fc_fcp_complete);
1910 * fc_eh_abort() - Abort a command
1911 * @sc_cmd: scsi command to abort
1913 * From scsi host template.
1914 * send ABTS to the target device and wait for the response
1915 * sc_cmd is the pointer to the command to be aborted.
1917 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1919 struct fc_fcp_pkt *fsp;
1920 struct fc_lport *lp;
1922 unsigned long flags;
1924 lp = shost_priv(sc_cmd->device->host);
1925 if (lp->state != LPORT_ST_READY)
1927 else if (!lp->link_up)
1930 spin_lock_irqsave(lp->host->host_lock, flags);
1931 fsp = CMD_SP(sc_cmd);
1933 /* command completed while scsi eh was setting up */
1934 spin_unlock_irqrestore(lp->host->host_lock, flags);
1937 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1938 fc_fcp_pkt_hold(fsp);
1939 spin_unlock_irqrestore(lp->host->host_lock, flags);
1941 if (fc_fcp_lock_pkt(fsp)) {
1942 /* completed while we were waiting for timer to be deleted */
1947 rc = fc_fcp_pkt_abort(fsp);
1948 fc_fcp_unlock_pkt(fsp);
1951 fc_fcp_pkt_release(fsp);
1954 EXPORT_SYMBOL(fc_eh_abort);
1957 * fc_eh_device_reset() Reset a single LUN
1958 * @sc_cmd: scsi command
1960 * Set from scsi host template to send tm cmd to the target and wait for the
1963 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1965 struct fc_lport *lp;
1966 struct fc_fcp_pkt *fsp;
1967 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1969 struct fc_rport_libfc_priv *rp;
1972 rval = fc_remote_port_chkready(rport);
1976 rp = rport->dd_data;
1977 lp = shost_priv(sc_cmd->device->host);
1979 if (lp->state != LPORT_ST_READY)
1982 FC_SCSI_DBG(lp, "Resetting rport (%6x)\n", rport->port_id);
1984 fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
1986 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
1987 sc_cmd->result = DID_NO_CONNECT << 16;
1992 * Build the libfc request pkt. Do not set the scsi cmnd, because
1993 * the sc passed in is not setup for execution like when sent
1994 * through the queuecommand callout.
1996 fsp->lp = lp; /* save the softc ptr */
1997 fsp->rport = rport; /* set the remote port ptr */
2000 * flush outstanding commands
2002 rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2003 fsp->state = FC_SRB_FREE;
2004 fc_fcp_pkt_release(fsp);
2009 EXPORT_SYMBOL(fc_eh_device_reset);
2012 * fc_eh_host_reset() - The reset function will reset the ports on the host.
2013 * @sc_cmd: scsi command
2015 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2017 struct Scsi_Host *shost = sc_cmd->device->host;
2018 struct fc_lport *lp = shost_priv(shost);
2019 unsigned long wait_tmo;
2021 FC_SCSI_DBG(lp, "Resetting host\n");
2023 lp->tt.lport_reset(lp);
2024 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2025 while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
2028 if (fc_fcp_lport_queue_ready(lp)) {
2029 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2030 "on port (%6x)\n", fc_host_port_id(lp->host));
2033 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2034 "port (%6x) is not ready.\n",
2035 fc_host_port_id(lp->host));
2039 EXPORT_SYMBOL(fc_eh_host_reset);
2042 * fc_slave_alloc() - configure queue depth
2043 * @sdev: scsi device
2045 * Configures queue depth based on host's cmd_per_len. If not set
2046 * then we use the libfc default.
2048 int fc_slave_alloc(struct scsi_device *sdev)
2050 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2053 if (!rport || fc_remote_port_chkready(rport))
2056 if (sdev->tagged_supported) {
2057 if (sdev->host->hostt->cmd_per_lun)
2058 queue_depth = sdev->host->hostt->cmd_per_lun;
2060 queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
2061 scsi_activate_tcq(sdev, queue_depth);
2065 EXPORT_SYMBOL(fc_slave_alloc);
2067 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2069 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2070 return sdev->queue_depth;
2072 EXPORT_SYMBOL(fc_change_queue_depth);
2074 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2076 if (sdev->tagged_supported) {
2077 scsi_set_tag_type(sdev, tag_type);
2079 scsi_activate_tcq(sdev, sdev->queue_depth);
2081 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2087 EXPORT_SYMBOL(fc_change_queue_type);
2089 void fc_fcp_destroy(struct fc_lport *lp)
2091 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
2093 if (!list_empty(&si->scsi_pkt_queue))
2094 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2095 "port (%6x)\n", fc_host_port_id(lp->host));
2097 mempool_destroy(si->scsi_pkt_pool);
2099 lp->scsi_priv = NULL;
2101 EXPORT_SYMBOL(fc_fcp_destroy);
2103 int fc_fcp_init(struct fc_lport *lp)
2106 struct fc_fcp_internal *si;
2108 if (!lp->tt.fcp_cmd_send)
2109 lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
2111 if (!lp->tt.fcp_cleanup)
2112 lp->tt.fcp_cleanup = fc_fcp_cleanup;
2114 if (!lp->tt.fcp_abort_io)
2115 lp->tt.fcp_abort_io = fc_fcp_abort_io;
2117 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2121 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2123 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2124 if (!si->scsi_pkt_pool) {
2134 EXPORT_SYMBOL(fc_fcp_init);
2136 static int __init libfc_init(void)
2140 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2141 sizeof(struct fc_fcp_pkt),
2142 0, SLAB_HWCACHE_ALIGN, NULL);
2143 if (scsi_pkt_cachep == NULL) {
2144 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2145 "module load failed!");
2149 rc = fc_setup_exch_mgr();
2151 goto destroy_pkt_cache;
2153 rc = fc_setup_rport();
2159 fc_destroy_exch_mgr();
2161 kmem_cache_destroy(scsi_pkt_cachep);
2165 static void __exit libfc_exit(void)
2167 kmem_cache_destroy(scsi_pkt_cachep);
2168 fc_destroy_exch_mgr();
2172 module_init(libfc_init);
2173 module_exit(libfc_exit);