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>
44 struct kmem_cache *scsi_pkt_cachep;
46 /* SRB state definitions */
47 #define FC_SRB_FREE 0 /* cmd is free */
48 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
49 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
50 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
51 #define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */
52 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
53 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
54 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
56 #define FC_SRB_READ (1 << 1)
57 #define FC_SRB_WRITE (1 << 0)
60 * The SCp.ptr should be tested and set under the host lock. NULL indicates
61 * that the command has been retruned to the scsi layer.
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_pkt_queue: Current FCP packets
73 * @last_can_queue_ramp_down_time: ramp down time
74 * @last_can_queue_ramp_up_time: ramp up time
75 * @max_can_queue: max can_queue size
77 struct fc_fcp_internal {
78 mempool_t *scsi_pkt_pool;
79 struct list_head scsi_pkt_queue;
80 unsigned long last_can_queue_ramp_down_time;
81 unsigned long last_can_queue_ramp_up_time;
85 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
89 * FC scsi I/O related functions
91 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
92 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
93 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
94 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
95 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
96 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
97 static void fc_timeout_error(struct fc_fcp_pkt *);
98 static void fc_fcp_timeout(unsigned long);
99 static void fc_fcp_rec(struct fc_fcp_pkt *);
100 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
101 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
102 static void fc_io_compl(struct fc_fcp_pkt *);
104 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
105 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
106 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
109 * command status codes
111 #define FC_COMPLETE 0
112 #define FC_CMD_ABORTED 1
113 #define FC_CMD_RESET 2
114 #define FC_CMD_PLOGO 3
116 #define FC_TRANS_ERR 5
117 #define FC_DATA_OVRRUN 6
118 #define FC_DATA_UNDRUN 7
120 #define FC_HRD_ERROR 9
121 #define FC_CMD_TIME_OUT 10
124 * Error recovery timeout values.
126 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
127 #define FC_SCSI_TM_TOV (10 * HZ)
128 #define FC_SCSI_REC_TOV (2 * HZ)
129 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
130 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
132 #define FC_MAX_ERROR_CNT 5
133 #define FC_MAX_RECOV_RETRY 3
135 #define FC_FCP_DFLT_QUEUE_DEPTH 32
138 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
139 * @lport: The local port that the FCP packet is for
140 * @gfp: GFP flags for allocation
142 * Return value: fcp_pkt structure or null on allocation failure.
143 * Context: Can be called from process context, no lock is required.
145 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
147 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
148 struct fc_fcp_pkt *fsp;
150 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
152 memset(fsp, 0, sizeof(*fsp));
154 atomic_set(&fsp->ref_cnt, 1);
155 init_timer(&fsp->timer);
156 INIT_LIST_HEAD(&fsp->list);
157 spin_lock_init(&fsp->scsi_pkt_lock);
163 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
164 * @fsp: The FCP packet to be released
166 * Context: Can be called from process or interrupt context,
167 * no lock is required.
169 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
171 if (atomic_dec_and_test(&fsp->ref_cnt)) {
172 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
174 mempool_free(fsp, si->scsi_pkt_pool);
179 * fc_fcp_pkt_hold() - Hold a fcp_pkt
180 * @fsp: The FCP packet to be held
182 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
184 atomic_inc(&fsp->ref_cnt);
188 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
189 * @seq: The sequence that the FCP packet is on (required by destructor API)
190 * @fsp: The FCP packet to be released
192 * This routine is called by a destructor callback in the exch_seq_send()
193 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
194 * argument even though it is not used by this routine.
196 * Context: No locking required.
198 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
200 fc_fcp_pkt_release(fsp);
204 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
205 * @fsp: The FCP packet to be locked and incremented
207 * We should only return error if we return a command to SCSI-ml before
208 * getting a response. This can happen in cases where we send a abort, but
209 * do not wait for the response and the abort and command can be passing
210 * each other on the wire/network-layer.
212 * Note: this function locks the packet and gets a reference to allow
213 * callers to call the completion function while the lock is held and
214 * not have to worry about the packets refcount.
216 * TODO: Maybe we should just have callers grab/release the lock and
217 * have a function that they call to verify the fsp and grab a ref if
220 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
222 spin_lock_bh(&fsp->scsi_pkt_lock);
223 if (fsp->state & FC_SRB_COMPL) {
224 spin_unlock_bh(&fsp->scsi_pkt_lock);
228 fc_fcp_pkt_hold(fsp);
233 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
235 * @fsp: The FCP packet to be unlocked and decremented
237 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
239 spin_unlock_bh(&fsp->scsi_pkt_lock);
240 fc_fcp_pkt_release(fsp);
244 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
245 * @fsp: The FCP packet to start a timer for
246 * @delay: The timeout period for the timer
248 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
250 if (!(fsp->state & FC_SRB_COMPL))
251 mod_timer(&fsp->timer, jiffies + delay);
255 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
257 * @fsp: The FCP packet to abort exchanges on
259 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
264 fsp->state |= FC_SRB_ABORT_PENDING;
265 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
269 * fc_fcp_retry_cmd() - Retry a fcp_pkt
270 * @fsp: The FCP packet to be retried
272 * Sets the status code to be FC_ERROR and then calls
273 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
274 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
275 * The SCSI-ml will retry the command.
277 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
280 fsp->lp->tt.exch_done(fsp->seq_ptr);
284 fsp->state &= ~FC_SRB_ABORT_PENDING;
286 fsp->status_code = FC_ERROR;
287 fc_fcp_complete_locked(fsp);
291 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
292 * @fsp: The FCP packet that will manage the DDP frames
293 * @xid: The XID that will be used for the DDP exchange
295 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
297 struct fc_lport *lport;
303 if ((fsp->req_flags & FC_SRB_READ) &&
304 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
305 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
306 scsi_sg_count(fsp->cmd)))
312 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
313 * DDP related resources for a fcp_pkt
314 * @fsp: The FCP packet that DDP had been used on
316 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
318 struct fc_lport *lport;
323 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
327 if (lport->tt.ddp_done) {
328 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
329 fsp->xfer_ddp = FC_XID_UNKNOWN;
334 * fc_fcp_can_queue_ramp_up() - increases can_queue
335 * @lport: lport to ramp up can_queue
337 * Locking notes: Called with Scsi_Host lock held
339 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
341 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
344 if (si->last_can_queue_ramp_up_time &&
345 (time_before(jiffies, si->last_can_queue_ramp_up_time +
346 FC_CAN_QUEUE_PERIOD)))
349 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
350 FC_CAN_QUEUE_PERIOD))
353 si->last_can_queue_ramp_up_time = jiffies;
355 can_queue = lport->host->can_queue << 1;
356 if (can_queue >= si->max_can_queue) {
357 can_queue = si->max_can_queue;
358 si->last_can_queue_ramp_down_time = 0;
360 lport->host->can_queue = can_queue;
361 shost_printk(KERN_ERR, lport->host, "libfc: increased "
362 "can_queue to %d.\n", can_queue);
366 * fc_fcp_can_queue_ramp_down() - reduces can_queue
367 * @lport: lport to reduce can_queue
369 * If we are getting memory allocation failures, then we may
370 * be trying to execute too many commands. We let the running
371 * commands complete or timeout, then try again with a reduced
372 * can_queue. Eventually we will hit the point where we run
373 * on all reserved structs.
375 * Locking notes: Called with Scsi_Host lock held
377 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
379 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
382 if (si->last_can_queue_ramp_down_time &&
383 (time_before(jiffies, si->last_can_queue_ramp_down_time +
384 FC_CAN_QUEUE_PERIOD)))
387 si->last_can_queue_ramp_down_time = jiffies;
389 can_queue = lport->host->can_queue;
393 lport->host->can_queue = can_queue;
394 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
395 "Reducing can_queue to %d.\n", can_queue);
399 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
400 * @lport: fc lport struct
401 * @len: payload length
403 * Allocates fc_frame structure and buffer but if fails to allocate
404 * then reduce can_queue.
406 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
412 fp = fc_frame_alloc(lport, len);
414 spin_lock_irqsave(lport->host->host_lock, flags);
415 fc_fcp_can_queue_ramp_down(lport);
416 spin_unlock_irqrestore(lport->host->host_lock, flags);
422 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
423 * @fsp: The FCP packet the data is on
424 * @fp: The data frame
426 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
428 struct scsi_cmnd *sc = fsp->cmd;
429 struct fc_lport *lport = fsp->lp;
430 struct fcoe_dev_stats *stats;
431 struct fc_frame_header *fh;
438 struct scatterlist *sg;
441 fh = fc_frame_header_get(fp);
442 offset = ntohl(fh->fh_parm_offset);
443 start_offset = offset;
444 len = fr_len(fp) - sizeof(*fh);
445 buf = fc_frame_payload_get(fp, 0);
447 /* if this I/O is ddped, update xfer len */
448 fc_fcp_ddp_done(fsp);
450 if (offset + len > fsp->data_len) {
451 /* this should never happen */
452 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
453 fc_frame_crc_check(fp))
455 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
456 "data_len %x\n", len, offset, fsp->data_len);
457 fc_fcp_retry_cmd(fsp);
460 if (offset != fsp->xfer_len)
461 fsp->state |= FC_SRB_DISCONTIG;
463 sg = scsi_sglist(sc);
464 nents = scsi_sg_count(sc);
466 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
467 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
468 &offset, KM_SOFTIRQ0, NULL);
470 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
471 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
472 &offset, KM_SOFTIRQ0, &crc);
473 buf = fc_frame_payload_get(fp, 0);
475 crc = crc32(crc, buf + len, 4 - (len % 4));
477 if (~crc != le32_to_cpu(fr_crc(fp))) {
479 stats = fc_lport_get_stats(lport);
480 stats->ErrorFrames++;
481 /* FIXME - per cpu count, not total count! */
482 if (stats->InvalidCRCCount++ < 5)
483 printk(KERN_WARNING "libfc: CRC error on data "
484 "frame for port (%6x)\n",
485 fc_host_port_id(lport->host));
487 * Assume the frame is total garbage.
488 * We may have copied it over the good part
490 * If so, we need to retry the entire operation.
491 * Otherwise, ignore it.
493 if (fsp->state & FC_SRB_DISCONTIG)
494 fc_fcp_retry_cmd(fsp);
499 if (fsp->xfer_contig_end == start_offset)
500 fsp->xfer_contig_end += copy_len;
501 fsp->xfer_len += copy_len;
504 * In the very rare event that this data arrived after the response
505 * and completes the transfer, call the completion handler.
507 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
508 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
509 fc_fcp_complete_locked(fsp);
513 * fc_fcp_send_data() - Send SCSI data to a target
514 * @fsp: The FCP packet the data is on
515 * @sp: The sequence the data is to be sent on
516 * @offset: The starting offset for this data request
517 * @seq_blen: The burst length for this data request
519 * Called after receiving a Transfer Ready data descriptor.
520 * If the LLD is capable of sequence offload then send down the
521 * seq_blen ammount of data in single frame, otherwise send
522 * multiple frames of the maximum frame payload supported by
525 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
526 size_t offset, size_t seq_blen)
529 struct scsi_cmnd *sc;
530 struct scatterlist *sg;
531 struct fc_frame *fp = NULL;
532 struct fc_lport *lport = fsp->lp;
538 size_t frame_offset, fh_parm_offset;
543 int using_sg = lport->sg_supp;
546 WARN_ON(seq_blen <= 0);
547 if (unlikely(offset + seq_blen > fsp->data_len)) {
548 /* this should never happen */
549 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
550 "offset %zx\n", seq_blen, offset);
551 fc_fcp_send_abort(fsp);
553 } else if (offset != fsp->xfer_len) {
554 /* Out of Order Data Request - no problem, but unexpected. */
555 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
556 "seq_blen %zx offset %zx\n", seq_blen, offset);
560 * if LLD is capable of seq_offload then set transport
561 * burst length (t_blen) to seq_blen, otherwise set t_blen
562 * to max FC frame payload previously set in fsp->max_payload.
564 t_blen = fsp->max_payload;
565 if (lport->seq_offload) {
566 t_blen = min(seq_blen, (size_t)lport->lso_max);
567 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
568 fsp, seq_blen, lport->lso_max, t_blen);
571 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
573 t_blen &= ~(512 - 1); /* round down to block size */
574 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
577 remaining = seq_blen;
578 fh_parm_offset = frame_offset = offset;
580 seq = lport->tt.seq_start_next(seq);
581 f_ctl = FC_FC_REL_OFF;
584 sg = scsi_sglist(sc);
586 while (remaining > 0 && sg) {
587 if (offset >= sg->length) {
588 offset -= sg->length;
593 tlen = min(t_blen, remaining);
596 * TODO. Temporary workaround. fc_seq_send() can't
597 * handle odd lengths in non-linear skbs.
598 * This will be the final fragment only.
602 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
606 data = fc_frame_header_get(fp) + 1;
607 fh_parm_offset = frame_offset;
608 fr_max_payload(fp) = fsp->max_payload;
611 off = offset + sg->offset;
612 sg_bytes = min(tlen, sg->length - offset);
613 sg_bytes = min(sg_bytes,
614 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
615 page = sg_page(sg) + (off >> PAGE_SHIFT);
618 skb_fill_page_desc(fp_skb(fp),
619 skb_shinfo(fp_skb(fp))->nr_frags,
620 page, off & ~PAGE_MASK, sg_bytes);
621 fp_skb(fp)->data_len += sg_bytes;
622 fr_len(fp) += sg_bytes;
623 fp_skb(fp)->truesize += PAGE_SIZE;
626 * The scatterlist item may be bigger than PAGE_SIZE,
627 * but we must not cross pages inside the kmap.
629 page_addr = kmap_atomic(page, KM_SOFTIRQ0);
630 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
632 kunmap_atomic(page_addr, KM_SOFTIRQ0);
636 frame_offset += sg_bytes;
638 remaining -= sg_bytes;
640 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
645 * Send sequence with transfer sequence initiative in case
646 * this is last FCP frame of the sequence.
649 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
651 ep = fc_seq_exch(seq);
652 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
653 FC_TYPE_FCP, f_ctl, fh_parm_offset);
656 * send fragment using for a sequence.
658 error = lport->tt.seq_send(lport, seq, fp);
660 WARN_ON(1); /* send error should be rare */
661 fc_fcp_retry_cmd(fsp);
666 fsp->xfer_len += seq_blen; /* premature count? */
671 * fc_fcp_abts_resp() - Send an ABTS response
672 * @fsp: The FCP packet that is being aborted
673 * @fp: The response frame
675 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
678 struct fc_ba_rjt *brp;
679 struct fc_frame_header *fh;
681 fh = fc_frame_header_get(fp);
682 switch (fh->fh_r_ctl) {
686 brp = fc_frame_payload_get(fp, sizeof(*brp));
687 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
692 * we will let the command timeout
693 * and scsi-ml recover in this case,
694 * therefore cleared the ba_done flag.
700 fsp->state |= FC_SRB_ABORTED;
701 fsp->state &= ~FC_SRB_ABORT_PENDING;
703 if (fsp->wait_for_comp)
704 complete(&fsp->tm_done);
706 fc_fcp_complete_locked(fsp);
711 * fc_fcp_recv() - Reveive an FCP frame
712 * @seq: The sequence the frame is on
713 * @fp: The received frame
714 * @arg: The related FCP packet
716 * Context: Called from Soft IRQ context. Can not be called
717 * holding the FCP packet list lock.
719 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
721 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
722 struct fc_lport *lport = fsp->lp;
723 struct fc_frame_header *fh;
724 struct fcp_txrdy *dd;
729 fc_fcp_error(fsp, fp);
733 fh = fc_frame_header_get(fp);
734 r_ctl = fh->fh_r_ctl;
736 if (!(lport->state & LPORT_ST_READY))
738 if (fc_fcp_lock_pkt(fsp))
740 fsp->last_pkt_time = jiffies;
742 if (fh->fh_type == FC_TYPE_BLS) {
743 fc_fcp_abts_resp(fsp, fp);
747 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
750 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
752 * received XFER RDY from the target
753 * need to send data to the target
755 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
756 dd = fc_frame_payload_get(fp, sizeof(*dd));
759 rc = fc_fcp_send_data(fsp, seq,
760 (size_t) ntohl(dd->ft_data_ro),
761 (size_t) ntohl(dd->ft_burst_len));
763 seq->rec_data = fsp->xfer_len;
764 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
766 * received a DATA frame
767 * next we will copy the data to the system buffer
769 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
770 fc_fcp_recv_data(fsp, fp);
771 seq->rec_data = fsp->xfer_contig_end;
772 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
773 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
775 fc_fcp_resp(fsp, fp);
777 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
780 fc_fcp_unlock_pkt(fsp);
786 * fc_fcp_resp() - Handler for FCP responses
787 * @fsp: The FCP packet the response is for
788 * @fp: The response frame
790 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
792 struct fc_frame_header *fh;
793 struct fcp_resp *fc_rp;
794 struct fcp_resp_ext *rp_ex;
795 struct fcp_resp_rsp_info *fc_rp_info;
803 fh = (struct fc_frame_header *)fr_hdr(fp);
804 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
807 fc_rp = (struct fcp_resp *)(fh + 1);
808 fsp->cdb_status = fc_rp->fr_status;
809 flags = fc_rp->fr_flags;
810 fsp->scsi_comp_flags = flags;
811 expected_len = fsp->data_len;
813 /* if ddp, update xfer len */
814 fc_fcp_ddp_done(fsp);
816 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
817 rp_ex = (void *)(fc_rp + 1);
818 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
819 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
821 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
822 if (flags & FCP_RSP_LEN_VAL) {
823 respl = ntohl(rp_ex->fr_rsp_len);
824 if (respl != sizeof(*fc_rp_info))
826 if (fsp->wait_for_comp) {
827 /* Abuse cdb_status for rsp code */
828 fsp->cdb_status = fc_rp_info->rsp_code;
829 complete(&fsp->tm_done);
831 * tmfs will not have any scsi cmd so
838 if (flags & FCP_SNS_LEN_VAL) {
839 snsl = ntohl(rp_ex->fr_sns_len);
840 if (snsl > SCSI_SENSE_BUFFERSIZE)
841 snsl = SCSI_SENSE_BUFFERSIZE;
842 memcpy(fsp->cmd->sense_buffer,
843 (char *)fc_rp_info + respl, snsl);
846 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
847 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
849 if (flags & FCP_RESID_UNDER) {
850 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
852 * The cmnd->underflow is the minimum number of
853 * bytes that must be transfered for this
854 * command. Provided a sense condition is not
855 * present, make sure the actual amount
856 * transferred is at least the underflow value
859 if (!(flags & FCP_SNS_LEN_VAL) &&
860 (fc_rp->fr_status == 0) &&
861 (scsi_bufflen(fsp->cmd) -
862 fsp->scsi_resid) < fsp->cmd->underflow)
864 expected_len -= fsp->scsi_resid;
866 fsp->status_code = FC_ERROR;
870 fsp->state |= FC_SRB_RCV_STATUS;
873 * Check for missing or extra data frames.
875 if (unlikely(fsp->xfer_len != expected_len)) {
876 if (fsp->xfer_len < expected_len) {
878 * Some data may be queued locally,
879 * Wait a at least one jiffy to see if it is delivered.
880 * If this expires without data, we may do SRR.
882 fc_fcp_timer_set(fsp, 2);
885 fsp->status_code = FC_DATA_OVRRUN;
886 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, "
887 "len %x, data len %x\n",
889 fsp->xfer_len, expected_len, fsp->data_len);
891 fc_fcp_complete_locked(fsp);
895 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
896 "snsl %u\n", flags, fr_len(fp), respl, snsl);
898 fsp->status_code = FC_ERROR;
899 fc_fcp_complete_locked(fsp);
903 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
905 * @fsp: The FCP packet to be completed
907 * This function may sleep if a timer is pending. The packet lock must be
908 * held, and the host lock must not be held.
910 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
912 struct fc_lport *lport = fsp->lp;
917 if (fsp->state & FC_SRB_ABORT_PENDING)
920 if (fsp->state & FC_SRB_ABORTED) {
921 if (!fsp->status_code)
922 fsp->status_code = FC_CMD_ABORTED;
925 * Test for transport underrun, independent of response
928 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
929 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
930 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
931 fsp->status_code = FC_DATA_UNDRUN;
939 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
940 struct fc_frame *conf_frame;
943 csp = lport->tt.seq_start_next(seq);
944 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
946 f_ctl = FC_FC_SEQ_INIT;
947 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
948 ep = fc_seq_exch(seq);
949 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
951 FC_TYPE_FCP, f_ctl, 0);
952 lport->tt.seq_send(lport, csp, conf_frame);
955 lport->tt.exch_done(seq);
961 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
962 * @fsp: The FCP packet whose exchanges should be canceled
963 * @error: The reason for the cancellation
965 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
967 struct fc_lport *lport = fsp->lp;
970 lport->tt.exch_done(fsp->seq_ptr);
973 fsp->status_code = error;
977 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
978 * @lport: The local port whose exchanges should be canceled
979 * @id: The target's ID
981 * @error: The reason for cancellation
983 * If lun or id is -1, they are ignored.
985 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
986 unsigned int lun, int error)
988 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
989 struct fc_fcp_pkt *fsp;
990 struct scsi_cmnd *sc_cmd;
993 spin_lock_irqsave(lport->host->host_lock, flags);
995 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
997 if (id != -1 && scmd_id(sc_cmd) != id)
1000 if (lun != -1 && sc_cmd->device->lun != lun)
1003 fc_fcp_pkt_hold(fsp);
1004 spin_unlock_irqrestore(lport->host->host_lock, flags);
1006 if (!fc_fcp_lock_pkt(fsp)) {
1007 fc_fcp_cleanup_cmd(fsp, error);
1009 fc_fcp_unlock_pkt(fsp);
1012 fc_fcp_pkt_release(fsp);
1013 spin_lock_irqsave(lport->host->host_lock, flags);
1015 * while we dropped the lock multiple pkts could
1016 * have been released, so we have to start over.
1020 spin_unlock_irqrestore(lport->host->host_lock, flags);
1024 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1025 * @lport: The local port whose exchanges are to be aborted
1027 static void fc_fcp_abort_io(struct fc_lport *lport)
1029 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1033 * fc_fcp_pkt_send() - Send a fcp_pkt
1034 * @lport: The local port to send the FCP packet on
1035 * @fsp: The FCP packet to send
1037 * Return: Zero for success and -1 for failure
1038 * Locks: Called with the host lock and irqs disabled.
1040 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1042 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1045 fsp->cmd->SCp.ptr = (char *)fsp;
1046 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1047 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1049 int_to_scsilun(fsp->cmd->device->lun,
1050 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1051 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1052 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1054 spin_unlock_irq(lport->host->host_lock);
1055 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1056 spin_lock_irq(lport->host->host_lock);
1058 list_del(&fsp->list);
1064 * fc_fcp_cmd_send() - Send a FCP command
1065 * @lport: The local port to send the command on
1066 * @fsp: The FCP packet the command is on
1067 * @resp: The handler for the response
1069 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1070 void (*resp)(struct fc_seq *,
1071 struct fc_frame *fp,
1074 struct fc_frame *fp;
1076 struct fc_rport *rport;
1077 struct fc_rport_libfc_priv *rpriv;
1078 const size_t len = sizeof(fsp->cdb_cmd);
1081 if (fc_fcp_lock_pkt(fsp))
1084 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1090 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1093 fsp->max_payload = rport->maxframe_size;
1094 rpriv = rport->dd_data;
1096 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1097 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP,
1098 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1100 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1106 fsp->last_pkt_time = jiffies;
1108 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1110 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1111 fc_fcp_timer_set(fsp,
1112 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1113 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1115 fc_fcp_unlock_pkt(fsp);
1120 * fc_fcp_error() - Handler for FCP layer errors
1121 * @fsp: The FCP packet the error is on
1122 * @fp: The frame that has errored
1124 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1126 int error = PTR_ERR(fp);
1128 if (fc_fcp_lock_pkt(fsp))
1131 if (error == -FC_EX_CLOSED) {
1132 fc_fcp_retry_cmd(fsp);
1137 * clear abort pending, because the lower layer
1138 * decided to force completion.
1140 fsp->state &= ~FC_SRB_ABORT_PENDING;
1141 fsp->status_code = FC_CMD_PLOGO;
1142 fc_fcp_complete_locked(fsp);
1144 fc_fcp_unlock_pkt(fsp);
1148 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1149 * @fsp: The FCP packet to abort on
1151 * Called to send an abort and then wait for abort completion
1153 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1157 if (fc_fcp_send_abort(fsp))
1160 init_completion(&fsp->tm_done);
1161 fsp->wait_for_comp = 1;
1163 spin_unlock_bh(&fsp->scsi_pkt_lock);
1164 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1165 spin_lock_bh(&fsp->scsi_pkt_lock);
1166 fsp->wait_for_comp = 0;
1169 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1171 } else if (fsp->state & FC_SRB_ABORTED) {
1172 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1174 fc_fcp_complete_locked(fsp);
1181 * fc_lun_reset_send() - Send LUN reset command
1182 * @data: The FCP packet that identifies the LUN to be reset
1184 static void fc_lun_reset_send(unsigned long data)
1186 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1187 struct fc_lport *lport = fsp->lp;
1188 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1189 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1191 if (fc_fcp_lock_pkt(fsp))
1193 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1194 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1195 fc_fcp_unlock_pkt(fsp);
1200 * fc_lun_reset() - Send a LUN RESET command to a device
1201 * and wait for the reply
1202 * @lport: The local port to sent the comand on
1203 * @fsp: The FCP packet that identifies the LUN to be reset
1204 * @id: The SCSI command ID
1205 * @lun: The LUN ID to be reset
1207 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1208 unsigned int id, unsigned int lun)
1212 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1213 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1214 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1216 fsp->wait_for_comp = 1;
1217 init_completion(&fsp->tm_done);
1219 fc_lun_reset_send((unsigned long)fsp);
1222 * wait for completion of reset
1223 * after that make sure all commands are terminated
1225 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1227 spin_lock_bh(&fsp->scsi_pkt_lock);
1228 fsp->state |= FC_SRB_COMPL;
1229 spin_unlock_bh(&fsp->scsi_pkt_lock);
1231 del_timer_sync(&fsp->timer);
1233 spin_lock_bh(&fsp->scsi_pkt_lock);
1235 lport->tt.exch_done(fsp->seq_ptr);
1236 fsp->seq_ptr = NULL;
1238 fsp->wait_for_comp = 0;
1239 spin_unlock_bh(&fsp->scsi_pkt_lock);
1242 FC_SCSI_DBG(lport, "lun reset failed\n");
1246 /* cdb_status holds the tmf's rsp code */
1247 if (fsp->cdb_status != FCP_TMF_CMPL)
1250 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1251 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1256 * fc_tm_done() - Task Managment response handler
1257 * @seq: The sequence that the response is on
1258 * @fp: The response frame
1259 * @arg: The FCP packet the response is for
1261 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1263 struct fc_fcp_pkt *fsp = arg;
1264 struct fc_frame_header *fh;
1268 * If there is an error just let it timeout or wait
1269 * for TMF to be aborted if it timedout.
1271 * scsi-eh will escalate for when either happens.
1276 if (fc_fcp_lock_pkt(fsp))
1280 * raced with eh timeout handler.
1282 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1283 spin_unlock_bh(&fsp->scsi_pkt_lock);
1287 fh = fc_frame_header_get(fp);
1288 if (fh->fh_type != FC_TYPE_BLS)
1289 fc_fcp_resp(fsp, fp);
1290 fsp->seq_ptr = NULL;
1291 fsp->lp->tt.exch_done(seq);
1293 fc_fcp_unlock_pkt(fsp);
1297 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1298 * @lport: The local port to be cleaned up
1300 static void fc_fcp_cleanup(struct fc_lport *lport)
1302 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1306 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1307 * @data: The FCP packet that has timed out
1309 * If REC is supported then just issue it and return. The REC exchange will
1310 * complete or time out and recovery can continue at that point. Otherwise,
1311 * if the response has been received without all the data it has been
1312 * ER_TIMEOUT since the response was received. If the response has not been
1313 * received we see if data was received recently. If it has been then we
1314 * continue waiting, otherwise, we abort the command.
1316 static void fc_fcp_timeout(unsigned long data)
1318 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1319 struct fc_rport *rport = fsp->rport;
1320 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1322 if (fc_fcp_lock_pkt(fsp))
1325 if (fsp->cdb_cmd.fc_tm_flags)
1328 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1330 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1332 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1334 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1335 else if (fsp->state & FC_SRB_RCV_STATUS)
1336 fc_fcp_complete_locked(fsp);
1338 fc_timeout_error(fsp);
1339 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1341 fc_fcp_unlock_pkt(fsp);
1345 * fc_fcp_rec() - Send a REC ELS request
1346 * @fsp: The FCP packet to send the REC request on
1348 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1350 struct fc_lport *lport;
1351 struct fc_frame *fp;
1352 struct fc_rport *rport;
1353 struct fc_rport_libfc_priv *rpriv;
1357 rpriv = rport->dd_data;
1358 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1359 fsp->status_code = FC_HRD_ERROR;
1361 fc_fcp_complete_locked(fsp);
1364 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1368 fr_seq(fp) = fsp->seq_ptr;
1369 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1370 fc_host_port_id(rpriv->local_port->host), FC_TYPE_ELS,
1371 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1372 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1373 fc_fcp_rec_resp, fsp,
1374 jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1375 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1379 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1380 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1382 fc_timeout_error(fsp);
1386 * fc_fcp_rec_resp() - Handler for REC ELS responses
1387 * @seq: The sequence the response is on
1388 * @fp: The response frame
1389 * @arg: The FCP packet the response is on
1391 * If the response is a reject then the scsi layer will handle
1392 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1393 * set the timeout and return. If the I/O was completed then complete the
1394 * exchange and tell the SCSI layer.
1396 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1398 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1399 struct fc_els_rec_acc *recp;
1400 struct fc_els_ls_rjt *rjt;
1404 enum dma_data_direction data_dir;
1406 struct fc_rport_libfc_priv *rpriv;
1409 fc_fcp_rec_error(fsp, fp);
1413 if (fc_fcp_lock_pkt(fsp))
1416 fsp->recov_retry = 0;
1417 opcode = fc_frame_payload_op(fp);
1418 if (opcode == ELS_LS_RJT) {
1419 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1420 switch (rjt->er_reason) {
1422 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1423 "reason %d expl %d\n",
1424 fsp->rport->port_id, rjt->er_reason,
1428 FC_FCP_DBG(fsp, "device does not support REC\n");
1429 rpriv = fsp->rport->dd_data;
1431 * if we do not spport RECs or got some bogus
1432 * reason then resetup timer so we check for
1435 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1436 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1441 * If no data transfer, the command frame got dropped
1442 * so we just retry. If data was transferred, we
1443 * lost the response but the target has no record,
1444 * so we abort and retry.
1446 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1447 fsp->xfer_len == 0) {
1448 fc_fcp_retry_cmd(fsp);
1451 fc_timeout_error(fsp);
1454 } else if (opcode == ELS_LS_ACC) {
1455 if (fsp->state & FC_SRB_ABORTED)
1458 data_dir = fsp->cmd->sc_data_direction;
1459 recp = fc_frame_payload_get(fp, sizeof(*recp));
1460 offset = ntohl(recp->reca_fc4value);
1461 e_stat = ntohl(recp->reca_e_stat);
1463 if (e_stat & ESB_ST_COMPLETE) {
1466 * The exchange is complete.
1468 * For output, we must've lost the response.
1469 * For input, all data must've been sent.
1470 * We lost may have lost the response
1471 * (and a confirmation was requested) and maybe
1474 * If all data received, send SRR
1475 * asking for response. If partial data received,
1476 * or gaps, SRR requests data at start of gap.
1477 * Recovery via SRR relies on in-order-delivery.
1479 if (data_dir == DMA_TO_DEVICE) {
1480 r_ctl = FC_RCTL_DD_CMD_STATUS;
1481 } else if (fsp->xfer_contig_end == offset) {
1482 r_ctl = FC_RCTL_DD_CMD_STATUS;
1484 offset = fsp->xfer_contig_end;
1485 r_ctl = FC_RCTL_DD_SOL_DATA;
1487 fc_fcp_srr(fsp, r_ctl, offset);
1488 } else if (e_stat & ESB_ST_SEQ_INIT) {
1491 * The remote port has the initiative, so just
1492 * keep waiting for it to complete.
1494 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1498 * The exchange is incomplete, we have seq. initiative.
1499 * Lost response with requested confirmation,
1500 * lost confirmation, lost transfer ready or
1503 * For output, if not all data was received, ask
1504 * for transfer ready to be repeated.
1506 * If we received or sent all the data, send SRR to
1509 * If we lost a response, we may have lost some read
1512 r_ctl = FC_RCTL_DD_SOL_DATA;
1513 if (data_dir == DMA_TO_DEVICE) {
1514 r_ctl = FC_RCTL_DD_CMD_STATUS;
1515 if (offset < fsp->data_len)
1516 r_ctl = FC_RCTL_DD_DATA_DESC;
1517 } else if (offset == fsp->xfer_contig_end) {
1518 r_ctl = FC_RCTL_DD_CMD_STATUS;
1519 } else if (fsp->xfer_contig_end < offset) {
1520 offset = fsp->xfer_contig_end;
1522 fc_fcp_srr(fsp, r_ctl, offset);
1526 fc_fcp_unlock_pkt(fsp);
1528 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1533 * fc_fcp_rec_error() - Handler for REC errors
1534 * @fsp: The FCP packet the error is on
1535 * @fp: The REC frame
1537 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1539 int error = PTR_ERR(fp);
1541 if (fc_fcp_lock_pkt(fsp))
1546 fc_fcp_retry_cmd(fsp);
1550 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
1551 fsp, fsp->rport->port_id, error);
1552 fsp->status_code = FC_CMD_PLOGO;
1555 case -FC_EX_TIMEOUT:
1557 * Assume REC or LS_ACC was lost.
1558 * The exchange manager will have aborted REC, so retry.
1560 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n",
1561 fsp->rport->port_id, error, fsp->recov_retry,
1562 FC_MAX_RECOV_RETRY);
1563 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1566 fc_timeout_error(fsp);
1569 fc_fcp_unlock_pkt(fsp);
1571 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1575 * fc_timeout_error() - Handler for fcp_pkt timeouts
1576 * @fsp: The FCP packt that has timed out
1578 static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1580 fsp->status_code = FC_CMD_TIME_OUT;
1581 fsp->cdb_status = 0;
1584 * if this fails then we let the scsi command timer fire and
1587 fc_fcp_send_abort(fsp);
1591 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1592 * @fsp: The FCP packet the SRR is to be sent on
1593 * @r_ctl: The R_CTL field for the SRR request
1594 * This is called after receiving status but insufficient data, or
1595 * when expecting status but the request has timed out.
1597 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1599 struct fc_lport *lport = fsp->lp;
1600 struct fc_rport *rport;
1601 struct fc_rport_libfc_priv *rpriv;
1602 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1604 struct fcp_srr *srr;
1605 struct fc_frame *fp;
1609 rpriv = rport->dd_data;
1610 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1612 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1613 rpriv->rp_state != RPORT_ST_READY)
1614 goto retry; /* shouldn't happen */
1615 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1619 srr = fc_frame_payload_get(fp, sizeof(*srr));
1620 memset(srr, 0, sizeof(*srr));
1621 srr->srr_op = ELS_SRR;
1622 srr->srr_ox_id = htons(ep->oxid);
1623 srr->srr_rx_id = htons(ep->rxid);
1624 srr->srr_r_ctl = r_ctl;
1625 srr->srr_rel_off = htonl(offset);
1627 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1628 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP,
1629 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1631 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
1632 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1636 fsp->recov_seq = seq;
1637 fsp->xfer_len = offset;
1638 fsp->xfer_contig_end = offset;
1639 fsp->state &= ~FC_SRB_RCV_STATUS;
1640 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1643 fc_fcp_retry_cmd(fsp);
1647 * fc_fcp_srr_resp() - Handler for SRR response
1648 * @seq: The sequence the SRR is on
1649 * @fp: The SRR frame
1650 * @arg: The FCP packet the SRR is on
1652 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1654 struct fc_fcp_pkt *fsp = arg;
1655 struct fc_frame_header *fh;
1658 fc_fcp_srr_error(fsp, fp);
1662 if (fc_fcp_lock_pkt(fsp))
1665 fh = fc_frame_header_get(fp);
1667 * BUG? fc_fcp_srr_error calls exch_done which would release
1668 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1669 * then fc_exch_timeout would be sending an abort. The exch_done
1670 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1671 * an abort response though.
1673 if (fh->fh_type == FC_TYPE_BLS) {
1674 fc_fcp_unlock_pkt(fsp);
1678 fsp->recov_seq = NULL;
1679 switch (fc_frame_payload_op(fp)) {
1681 fsp->recov_retry = 0;
1682 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1686 fc_timeout_error(fsp);
1689 fc_fcp_unlock_pkt(fsp);
1690 fsp->lp->tt.exch_done(seq);
1693 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1697 * fc_fcp_srr_error() - Handler for SRR errors
1698 * @fsp: The FCP packet that the SRR error is on
1699 * @fp: The SRR frame
1701 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1703 if (fc_fcp_lock_pkt(fsp))
1705 fsp->lp->tt.exch_done(fsp->recov_seq);
1706 fsp->recov_seq = NULL;
1707 switch (PTR_ERR(fp)) {
1708 case -FC_EX_TIMEOUT:
1709 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1712 fc_timeout_error(fsp);
1714 case -FC_EX_CLOSED: /* e.g., link failure */
1717 fc_fcp_retry_cmd(fsp);
1720 fc_fcp_unlock_pkt(fsp);
1722 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1726 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1727 * @lport: The local port to be checked
1729 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1732 return (lport->state == LPORT_ST_READY) &&
1733 lport->link_up && !lport->qfull;
1737 * fc_queuecommand() - The queuecommand function of the SCSI template
1738 * @cmd: The scsi_cmnd to be executed
1739 * @done: The callback function to be called when the scsi_cmnd is complete
1741 * This is the i/o strategy routine, called by the SCSI layer. This routine
1742 * is called with the host_lock held.
1744 int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1746 struct fc_lport *lport;
1747 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1748 struct fc_fcp_pkt *fsp;
1749 struct fc_rport_libfc_priv *rpriv;
1752 struct fcoe_dev_stats *stats;
1754 lport = shost_priv(sc_cmd->device->host);
1756 rval = fc_remote_port_chkready(rport);
1758 sc_cmd->result = rval;
1763 if (!*(struct fc_remote_port **)rport->dd_data) {
1765 * rport is transitioning from blocked/deleted to
1768 sc_cmd->result = DID_IMM_RETRY << 16;
1773 rpriv = rport->dd_data;
1775 if (!fc_fcp_lport_queue_ready(lport)) {
1777 fc_fcp_can_queue_ramp_down(lport);
1778 rc = SCSI_MLQUEUE_HOST_BUSY;
1782 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1784 rc = SCSI_MLQUEUE_HOST_BUSY;
1789 * build the libfc request pkt
1791 fsp->cmd = sc_cmd; /* save the cmd */
1792 fsp->lp = lport; /* save the softc ptr */
1793 fsp->rport = rport; /* set the remote port ptr */
1794 fsp->xfer_ddp = FC_XID_UNKNOWN;
1795 sc_cmd->scsi_done = done;
1798 * set up the transfer length
1800 fsp->data_len = scsi_bufflen(sc_cmd);
1804 * setup the data direction
1806 stats = fc_lport_get_stats(lport);
1807 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1808 fsp->req_flags = FC_SRB_READ;
1809 stats->InputRequests++;
1810 stats->InputMegabytes = fsp->data_len;
1811 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1812 fsp->req_flags = FC_SRB_WRITE;
1813 stats->OutputRequests++;
1814 stats->OutputMegabytes = fsp->data_len;
1817 stats->ControlRequests++;
1820 fsp->tgt_flags = rpriv->flags;
1822 init_timer(&fsp->timer);
1823 fsp->timer.data = (unsigned long)fsp;
1826 * send it to the lower layer
1827 * if we get -1 return then put the request in the pending
1830 rval = fc_fcp_pkt_send(lport, fsp);
1832 fsp->state = FC_SRB_FREE;
1833 fc_fcp_pkt_release(fsp);
1834 rc = SCSI_MLQUEUE_HOST_BUSY;
1839 EXPORT_SYMBOL(fc_queuecommand);
1842 * fc_io_compl() - Handle responses for completed commands
1843 * @fsp: The FCP packet that is complete
1845 * Translates fcp_pkt errors to a Linux SCSI errors.
1846 * The fcp packet lock must be held when calling.
1848 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1850 struct fc_fcp_internal *si;
1851 struct scsi_cmnd *sc_cmd;
1852 struct fc_lport *lport;
1853 unsigned long flags;
1855 /* release outstanding ddp context */
1856 fc_fcp_ddp_done(fsp);
1858 fsp->state |= FC_SRB_COMPL;
1859 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1860 spin_unlock_bh(&fsp->scsi_pkt_lock);
1861 del_timer_sync(&fsp->timer);
1862 spin_lock_bh(&fsp->scsi_pkt_lock);
1866 si = fc_get_scsi_internal(lport);
1867 spin_lock_irqsave(lport->host->host_lock, flags);
1869 spin_unlock_irqrestore(lport->host->host_lock, flags);
1874 * if can_queue ramp down is done then try can_queue ramp up
1875 * since commands are completing now.
1877 if (si->last_can_queue_ramp_down_time)
1878 fc_fcp_can_queue_ramp_up(lport);
1883 if (!sc_cmd->SCp.ptr) {
1884 spin_unlock_irqrestore(lport->host->host_lock, flags);
1888 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1889 switch (fsp->status_code) {
1891 if (fsp->cdb_status == 0) {
1895 sc_cmd->result = DID_OK << 16;
1896 if (fsp->scsi_resid)
1897 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1900 * transport level I/O was ok but scsi
1901 * has non zero status
1903 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1907 sc_cmd->result = DID_ERROR << 16;
1909 case FC_DATA_UNDRUN:
1910 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1912 * scsi status is good but transport level
1915 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ?
1916 DID_OK : DID_ERROR) << 16;
1919 * scsi got underrun, this is an error
1921 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1922 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1925 case FC_DATA_OVRRUN:
1927 * overrun is an error
1929 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1931 case FC_CMD_ABORTED:
1932 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1934 case FC_CMD_TIME_OUT:
1935 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1938 sc_cmd->result = (DID_RESET << 16);
1941 sc_cmd->result = (DID_NO_CONNECT << 16);
1944 sc_cmd->result = (DID_ERROR << 16);
1948 list_del(&fsp->list);
1949 sc_cmd->SCp.ptr = NULL;
1950 sc_cmd->scsi_done(sc_cmd);
1951 spin_unlock_irqrestore(lport->host->host_lock, flags);
1953 /* release ref from initial allocation in queue command */
1954 fc_fcp_pkt_release(fsp);
1958 * fc_eh_abort() - Abort a command
1959 * @sc_cmd: The SCSI command to abort
1961 * From SCSI host template.
1962 * Send an ABTS to the target device and wait for the response.
1964 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1966 struct fc_fcp_pkt *fsp;
1967 struct fc_lport *lport;
1969 unsigned long flags;
1971 lport = shost_priv(sc_cmd->device->host);
1972 if (lport->state != LPORT_ST_READY)
1974 else if (!lport->link_up)
1977 spin_lock_irqsave(lport->host->host_lock, flags);
1978 fsp = CMD_SP(sc_cmd);
1980 /* command completed while scsi eh was setting up */
1981 spin_unlock_irqrestore(lport->host->host_lock, flags);
1984 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1985 fc_fcp_pkt_hold(fsp);
1986 spin_unlock_irqrestore(lport->host->host_lock, flags);
1988 if (fc_fcp_lock_pkt(fsp)) {
1989 /* completed while we were waiting for timer to be deleted */
1994 rc = fc_fcp_pkt_abort(fsp);
1995 fc_fcp_unlock_pkt(fsp);
1998 fc_fcp_pkt_release(fsp);
2001 EXPORT_SYMBOL(fc_eh_abort);
2004 * fc_eh_device_reset() - Reset a single LUN
2005 * @sc_cmd: The SCSI command which identifies the device whose
2006 * LUN is to be reset
2008 * Set from SCSI host template.
2010 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2012 struct fc_lport *lport;
2013 struct fc_fcp_pkt *fsp;
2014 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2018 rval = fc_remote_port_chkready(rport);
2022 lport = shost_priv(sc_cmd->device->host);
2024 if (lport->state != LPORT_ST_READY)
2027 FC_SCSI_DBG(lport, "Resetting rport (%6x)\n", rport->port_id);
2029 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2031 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2036 * Build the libfc request pkt. Do not set the scsi cmnd, because
2037 * the sc passed in is not setup for execution like when sent
2038 * through the queuecommand callout.
2040 fsp->lp = lport; /* save the softc ptr */
2041 fsp->rport = rport; /* set the remote port ptr */
2044 * flush outstanding commands
2046 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2047 fsp->state = FC_SRB_FREE;
2048 fc_fcp_pkt_release(fsp);
2053 EXPORT_SYMBOL(fc_eh_device_reset);
2056 * fc_eh_host_reset() - Reset a Scsi_Host.
2057 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2059 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2061 struct Scsi_Host *shost = sc_cmd->device->host;
2062 struct fc_lport *lport = shost_priv(shost);
2063 unsigned long wait_tmo;
2065 FC_SCSI_DBG(lport, "Resetting host\n");
2067 lport->tt.lport_reset(lport);
2068 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2069 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2073 if (fc_fcp_lport_queue_ready(lport)) {
2074 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2075 "on port (%6x)\n", fc_host_port_id(lport->host));
2078 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2079 "port (%6x) is not ready.\n",
2080 fc_host_port_id(lport->host));
2084 EXPORT_SYMBOL(fc_eh_host_reset);
2087 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2088 * @sdev: The SCSI device that identifies the SCSI host
2090 * Configures queue depth based on host's cmd_per_len. If not set
2091 * then we use the libfc default.
2093 int fc_slave_alloc(struct scsi_device *sdev)
2095 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2097 if (!rport || fc_remote_port_chkready(rport))
2100 if (sdev->tagged_supported)
2101 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2103 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2104 FC_FCP_DFLT_QUEUE_DEPTH);
2108 EXPORT_SYMBOL(fc_slave_alloc);
2111 * fc_change_queue_depth() - Change a device's queue depth
2112 * @sdev: The SCSI device whose queue depth is to change
2113 * @qdepth: The new queue depth
2114 * @reason: The resason for the change
2116 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2119 case SCSI_QDEPTH_DEFAULT:
2120 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2122 case SCSI_QDEPTH_QFULL:
2123 scsi_track_queue_full(sdev, qdepth);
2125 case SCSI_QDEPTH_RAMP_UP:
2126 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2131 return sdev->queue_depth;
2133 EXPORT_SYMBOL(fc_change_queue_depth);
2136 * fc_change_queue_type() - Change a device's queue type
2137 * @sdev: The SCSI device whose queue depth is to change
2138 * @tag_type: Identifier for queue type
2140 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2142 if (sdev->tagged_supported) {
2143 scsi_set_tag_type(sdev, tag_type);
2145 scsi_activate_tcq(sdev, sdev->queue_depth);
2147 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2153 EXPORT_SYMBOL(fc_change_queue_type);
2156 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2157 * @lport: The local port that no longer needs the FCP layer
2159 void fc_fcp_destroy(struct fc_lport *lport)
2161 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2163 if (!list_empty(&si->scsi_pkt_queue))
2164 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2165 "port (%6x)\n", fc_host_port_id(lport->host));
2167 mempool_destroy(si->scsi_pkt_pool);
2169 lport->scsi_priv = NULL;
2171 EXPORT_SYMBOL(fc_fcp_destroy);
2177 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2178 sizeof(struct fc_fcp_pkt),
2179 0, SLAB_HWCACHE_ALIGN, NULL);
2180 if (!scsi_pkt_cachep) {
2181 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2182 "module load failed!");
2189 void fc_destroy_fcp()
2191 if (scsi_pkt_cachep)
2192 kmem_cache_destroy(scsi_pkt_cachep);
2196 * fc_fcp_init() - Initialize the FCP layer for a local port
2197 * @lport: The local port to initialize the exchange layer for
2199 int fc_fcp_init(struct fc_lport *lport)
2202 struct fc_fcp_internal *si;
2204 if (!lport->tt.fcp_cmd_send)
2205 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2207 if (!lport->tt.fcp_cleanup)
2208 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2210 if (!lport->tt.fcp_abort_io)
2211 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2213 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2216 lport->scsi_priv = si;
2217 si->max_can_queue = lport->host->can_queue;
2218 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2220 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2221 if (!si->scsi_pkt_pool) {
2231 EXPORT_SYMBOL(fc_fcp_init);