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 acknowledged */
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_queue_lock: Protects the scsi_pkt_queue
73 * @scsi_pkt_queue: Current FCP packets
74 * @last_can_queue_ramp_down_time: ramp down time
75 * @last_can_queue_ramp_up_time: ramp up time
76 * @max_can_queue: max can_queue size
78 struct fc_fcp_internal {
79 mempool_t *scsi_pkt_pool;
80 spinlock_t scsi_queue_lock;
81 struct list_head scsi_pkt_queue;
82 unsigned long last_can_queue_ramp_down_time;
83 unsigned long last_can_queue_ramp_up_time;
87 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
91 * FC scsi I/O related functions
93 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
94 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
95 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
96 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
97 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
98 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
99 static void fc_timeout_error(struct fc_fcp_pkt *);
100 static void fc_fcp_timeout(unsigned long);
101 static void fc_fcp_rec(struct fc_fcp_pkt *);
102 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
103 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
104 static void fc_io_compl(struct fc_fcp_pkt *);
106 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
107 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
108 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
111 * command status codes
113 #define FC_COMPLETE 0
114 #define FC_CMD_ABORTED 1
115 #define FC_CMD_RESET 2
116 #define FC_CMD_PLOGO 3
118 #define FC_TRANS_ERR 5
119 #define FC_DATA_OVRRUN 6
120 #define FC_DATA_UNDRUN 7
122 #define FC_HRD_ERROR 9
123 #define FC_CMD_TIME_OUT 10
126 * Error recovery timeout values.
128 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
129 #define FC_SCSI_TM_TOV (10 * HZ)
130 #define FC_SCSI_REC_TOV (2 * HZ)
131 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
132 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
134 #define FC_MAX_ERROR_CNT 5
135 #define FC_MAX_RECOV_RETRY 3
137 #define FC_FCP_DFLT_QUEUE_DEPTH 32
140 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
141 * @lport: The local port that the FCP packet is for
142 * @gfp: GFP flags for allocation
144 * Return value: fcp_pkt structure or null on allocation failure.
145 * Context: Can be called from process context, no lock is required.
147 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
149 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
150 struct fc_fcp_pkt *fsp;
152 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
154 memset(fsp, 0, sizeof(*fsp));
156 atomic_set(&fsp->ref_cnt, 1);
157 init_timer(&fsp->timer);
158 INIT_LIST_HEAD(&fsp->list);
159 spin_lock_init(&fsp->scsi_pkt_lock);
165 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
166 * @fsp: The FCP packet to be released
168 * Context: Can be called from process or interrupt context,
169 * no lock is required.
171 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
173 if (atomic_dec_and_test(&fsp->ref_cnt)) {
174 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
176 mempool_free(fsp, si->scsi_pkt_pool);
181 * fc_fcp_pkt_hold() - Hold a fcp_pkt
182 * @fsp: The FCP packet to be held
184 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
186 atomic_inc(&fsp->ref_cnt);
190 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
191 * @seq: The sequence that the FCP packet is on (required by destructor API)
192 * @fsp: The FCP packet to be released
194 * This routine is called by a destructor callback in the exch_seq_send()
195 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
196 * argument even though it is not used by this routine.
198 * Context: No locking required.
200 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
202 fc_fcp_pkt_release(fsp);
206 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
207 * @fsp: The FCP packet to be locked and incremented
209 * We should only return error if we return a command to SCSI-ml before
210 * getting a response. This can happen in cases where we send a abort, but
211 * do not wait for the response and the abort and command can be passing
212 * each other on the wire/network-layer.
214 * Note: this function locks the packet and gets a reference to allow
215 * callers to call the completion function while the lock is held and
216 * not have to worry about the packets refcount.
218 * TODO: Maybe we should just have callers grab/release the lock and
219 * have a function that they call to verify the fsp and grab a ref if
222 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
224 spin_lock_bh(&fsp->scsi_pkt_lock);
225 if (fsp->state & FC_SRB_COMPL) {
226 spin_unlock_bh(&fsp->scsi_pkt_lock);
230 fc_fcp_pkt_hold(fsp);
235 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
237 * @fsp: The FCP packet to be unlocked and decremented
239 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
241 spin_unlock_bh(&fsp->scsi_pkt_lock);
242 fc_fcp_pkt_release(fsp);
246 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
247 * @fsp: The FCP packet to start a timer for
248 * @delay: The timeout period for the timer
250 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
252 if (!(fsp->state & FC_SRB_COMPL))
253 mod_timer(&fsp->timer, jiffies + delay);
257 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
259 * @fsp: The FCP packet to abort exchanges on
261 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
266 fsp->state |= FC_SRB_ABORT_PENDING;
267 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
271 * fc_fcp_retry_cmd() - Retry a fcp_pkt
272 * @fsp: The FCP packet to be retried
274 * Sets the status code to be FC_ERROR and then calls
275 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
276 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
277 * The SCSI-ml will retry the command.
279 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
282 fsp->lp->tt.exch_done(fsp->seq_ptr);
286 fsp->state &= ~FC_SRB_ABORT_PENDING;
288 fsp->status_code = FC_ERROR;
289 fc_fcp_complete_locked(fsp);
293 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
294 * @fsp: The FCP packet that will manage the DDP frames
295 * @xid: The XID that will be used for the DDP exchange
297 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
299 struct fc_lport *lport;
305 if ((fsp->req_flags & FC_SRB_READ) &&
306 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
307 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
308 scsi_sg_count(fsp->cmd)))
314 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
315 * DDP related resources for a fcp_pkt
316 * @fsp: The FCP packet that DDP had been used on
318 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
320 struct fc_lport *lport;
325 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
329 if (lport->tt.ddp_done) {
330 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
331 fsp->xfer_ddp = FC_XID_UNKNOWN;
336 * fc_fcp_can_queue_ramp_up() - increases can_queue
337 * @lport: lport to ramp up can_queue
339 * Locking notes: Called with Scsi_Host lock held
341 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
343 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
346 if (si->last_can_queue_ramp_up_time &&
347 (time_before(jiffies, si->last_can_queue_ramp_up_time +
348 FC_CAN_QUEUE_PERIOD)))
351 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
352 FC_CAN_QUEUE_PERIOD))
355 si->last_can_queue_ramp_up_time = jiffies;
357 can_queue = lport->host->can_queue << 1;
358 if (can_queue >= si->max_can_queue) {
359 can_queue = si->max_can_queue;
360 si->last_can_queue_ramp_down_time = 0;
362 lport->host->can_queue = can_queue;
363 shost_printk(KERN_ERR, lport->host, "libfc: increased "
364 "can_queue to %d.\n", can_queue);
368 * fc_fcp_can_queue_ramp_down() - reduces can_queue
369 * @lport: lport to reduce can_queue
371 * If we are getting memory allocation failures, then we may
372 * be trying to execute too many commands. We let the running
373 * commands complete or timeout, then try again with a reduced
374 * can_queue. Eventually we will hit the point where we run
375 * on all reserved structs.
377 * Locking notes: Called with Scsi_Host lock held
379 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
381 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
384 if (si->last_can_queue_ramp_down_time &&
385 (time_before(jiffies, si->last_can_queue_ramp_down_time +
386 FC_CAN_QUEUE_PERIOD)))
389 si->last_can_queue_ramp_down_time = jiffies;
391 can_queue = lport->host->can_queue;
395 lport->host->can_queue = can_queue;
396 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
397 "Reducing can_queue to %d.\n", can_queue);
401 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
402 * @lport: fc lport struct
403 * @len: payload length
405 * Allocates fc_frame structure and buffer but if fails to allocate
406 * then reduce can_queue.
408 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
414 fp = fc_frame_alloc(lport, len);
419 spin_lock_irqsave(lport->host->host_lock, flags);
420 fc_fcp_can_queue_ramp_down(lport);
421 spin_unlock_irqrestore(lport->host->host_lock, flags);
426 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
427 * @fsp: The FCP packet the data is on
428 * @fp: The data frame
430 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
432 struct scsi_cmnd *sc = fsp->cmd;
433 struct fc_lport *lport = fsp->lp;
434 struct fcoe_dev_stats *stats;
435 struct fc_frame_header *fh;
442 struct scatterlist *sg;
445 fh = fc_frame_header_get(fp);
446 offset = ntohl(fh->fh_parm_offset);
447 start_offset = offset;
448 len = fr_len(fp) - sizeof(*fh);
449 buf = fc_frame_payload_get(fp, 0);
451 /* if this I/O is ddped, update xfer len */
452 fc_fcp_ddp_done(fsp);
454 if (offset + len > fsp->data_len) {
455 /* this should never happen */
456 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
457 fc_frame_crc_check(fp))
459 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
460 "data_len %x\n", len, offset, fsp->data_len);
461 fc_fcp_retry_cmd(fsp);
464 if (offset != fsp->xfer_len)
465 fsp->state |= FC_SRB_DISCONTIG;
467 sg = scsi_sglist(sc);
468 nents = scsi_sg_count(sc);
470 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
471 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
472 &offset, KM_SOFTIRQ0, NULL);
474 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
475 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
476 &offset, KM_SOFTIRQ0, &crc);
477 buf = fc_frame_payload_get(fp, 0);
479 crc = crc32(crc, buf + len, 4 - (len % 4));
481 if (~crc != le32_to_cpu(fr_crc(fp))) {
483 stats = fc_lport_get_stats(lport);
484 stats->ErrorFrames++;
485 /* FIXME - per cpu count, not total count! */
486 if (stats->InvalidCRCCount++ < 5)
487 printk(KERN_WARNING "libfc: CRC error on data "
488 "frame for port (%6x)\n",
489 fc_host_port_id(lport->host));
491 * Assume the frame is total garbage.
492 * We may have copied it over the good part
494 * If so, we need to retry the entire operation.
495 * Otherwise, ignore it.
497 if (fsp->state & FC_SRB_DISCONTIG)
498 fc_fcp_retry_cmd(fsp);
503 if (fsp->xfer_contig_end == start_offset)
504 fsp->xfer_contig_end += copy_len;
505 fsp->xfer_len += copy_len;
508 * In the very rare event that this data arrived after the response
509 * and completes the transfer, call the completion handler.
511 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
512 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
513 fc_fcp_complete_locked(fsp);
517 * fc_fcp_send_data() - Send SCSI data to a target
518 * @fsp: The FCP packet the data is on
519 * @sp: The sequence the data is to be sent on
520 * @offset: The starting offset for this data request
521 * @seq_blen: The burst length for this data request
523 * Called after receiving a Transfer Ready data descriptor.
524 * If the LLD is capable of sequence offload then send down the
525 * seq_blen amount of data in single frame, otherwise send
526 * multiple frames of the maximum frame payload supported by
529 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
530 size_t offset, size_t seq_blen)
533 struct scsi_cmnd *sc;
534 struct scatterlist *sg;
535 struct fc_frame *fp = NULL;
536 struct fc_lport *lport = fsp->lp;
542 size_t frame_offset, fh_parm_offset;
547 int using_sg = lport->sg_supp;
550 WARN_ON(seq_blen <= 0);
551 if (unlikely(offset + seq_blen > fsp->data_len)) {
552 /* this should never happen */
553 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
554 "offset %zx\n", seq_blen, offset);
555 fc_fcp_send_abort(fsp);
557 } else if (offset != fsp->xfer_len) {
558 /* Out of Order Data Request - no problem, but unexpected. */
559 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
560 "seq_blen %zx offset %zx\n", seq_blen, offset);
564 * if LLD is capable of seq_offload then set transport
565 * burst length (t_blen) to seq_blen, otherwise set t_blen
566 * to max FC frame payload previously set in fsp->max_payload.
568 t_blen = fsp->max_payload;
569 if (lport->seq_offload) {
570 t_blen = min(seq_blen, (size_t)lport->lso_max);
571 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
572 fsp, seq_blen, lport->lso_max, t_blen);
575 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
577 t_blen &= ~(512 - 1); /* round down to block size */
578 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
581 remaining = seq_blen;
582 fh_parm_offset = frame_offset = offset;
584 seq = lport->tt.seq_start_next(seq);
585 f_ctl = FC_FC_REL_OFF;
588 sg = scsi_sglist(sc);
590 while (remaining > 0 && sg) {
591 if (offset >= sg->length) {
592 offset -= sg->length;
597 tlen = min(t_blen, remaining);
600 * TODO. Temporary workaround. fc_seq_send() can't
601 * handle odd lengths in non-linear skbs.
602 * This will be the final fragment only.
606 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
610 data = fc_frame_header_get(fp) + 1;
611 fh_parm_offset = frame_offset;
612 fr_max_payload(fp) = fsp->max_payload;
615 off = offset + sg->offset;
616 sg_bytes = min(tlen, sg->length - offset);
617 sg_bytes = min(sg_bytes,
618 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
619 page = sg_page(sg) + (off >> PAGE_SHIFT);
622 skb_fill_page_desc(fp_skb(fp),
623 skb_shinfo(fp_skb(fp))->nr_frags,
624 page, off & ~PAGE_MASK, sg_bytes);
625 fp_skb(fp)->data_len += sg_bytes;
626 fr_len(fp) += sg_bytes;
627 fp_skb(fp)->truesize += PAGE_SIZE;
630 * The scatterlist item may be bigger than PAGE_SIZE,
631 * but we must not cross pages inside the kmap.
633 page_addr = kmap_atomic(page, KM_SOFTIRQ0);
634 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
636 kunmap_atomic(page_addr, KM_SOFTIRQ0);
640 frame_offset += sg_bytes;
642 remaining -= sg_bytes;
644 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
649 * Send sequence with transfer sequence initiative in case
650 * this is last FCP frame of the sequence.
653 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
655 ep = fc_seq_exch(seq);
656 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
657 FC_TYPE_FCP, f_ctl, fh_parm_offset);
660 * send fragment using for a sequence.
662 error = lport->tt.seq_send(lport, seq, fp);
664 WARN_ON(1); /* send error should be rare */
665 fc_fcp_retry_cmd(fsp);
670 fsp->xfer_len += seq_blen; /* premature count? */
675 * fc_fcp_abts_resp() - Send an ABTS response
676 * @fsp: The FCP packet that is being aborted
677 * @fp: The response frame
679 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
682 struct fc_ba_rjt *brp;
683 struct fc_frame_header *fh;
685 fh = fc_frame_header_get(fp);
686 switch (fh->fh_r_ctl) {
690 brp = fc_frame_payload_get(fp, sizeof(*brp));
691 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
696 * we will let the command timeout
697 * and scsi-ml recover in this case,
698 * therefore cleared the ba_done flag.
704 fsp->state |= FC_SRB_ABORTED;
705 fsp->state &= ~FC_SRB_ABORT_PENDING;
707 if (fsp->wait_for_comp)
708 complete(&fsp->tm_done);
710 fc_fcp_complete_locked(fsp);
715 * fc_fcp_recv() - Reveive an FCP frame
716 * @seq: The sequence the frame is on
717 * @fp: The received frame
718 * @arg: The related FCP packet
720 * Context: Called from Soft IRQ context. Can not be called
721 * holding the FCP packet list lock.
723 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
725 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
726 struct fc_lport *lport = fsp->lp;
727 struct fc_frame_header *fh;
728 struct fcp_txrdy *dd;
733 fc_fcp_error(fsp, fp);
737 fh = fc_frame_header_get(fp);
738 r_ctl = fh->fh_r_ctl;
740 if (!(lport->state & LPORT_ST_READY))
742 if (fc_fcp_lock_pkt(fsp))
744 fsp->last_pkt_time = jiffies;
746 if (fh->fh_type == FC_TYPE_BLS) {
747 fc_fcp_abts_resp(fsp, fp);
751 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
754 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
756 * received XFER RDY from the target
757 * need to send data to the target
759 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
760 dd = fc_frame_payload_get(fp, sizeof(*dd));
763 rc = fc_fcp_send_data(fsp, seq,
764 (size_t) ntohl(dd->ft_data_ro),
765 (size_t) ntohl(dd->ft_burst_len));
767 seq->rec_data = fsp->xfer_len;
768 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
770 * received a DATA frame
771 * next we will copy the data to the system buffer
773 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
774 fc_fcp_recv_data(fsp, fp);
775 seq->rec_data = fsp->xfer_contig_end;
776 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
777 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
779 fc_fcp_resp(fsp, fp);
781 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
784 fc_fcp_unlock_pkt(fsp);
790 * fc_fcp_resp() - Handler for FCP responses
791 * @fsp: The FCP packet the response is for
792 * @fp: The response frame
794 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
796 struct fc_frame_header *fh;
797 struct fcp_resp *fc_rp;
798 struct fcp_resp_ext *rp_ex;
799 struct fcp_resp_rsp_info *fc_rp_info;
807 fh = (struct fc_frame_header *)fr_hdr(fp);
808 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
811 fc_rp = (struct fcp_resp *)(fh + 1);
812 fsp->cdb_status = fc_rp->fr_status;
813 flags = fc_rp->fr_flags;
814 fsp->scsi_comp_flags = flags;
815 expected_len = fsp->data_len;
817 /* if ddp, update xfer len */
818 fc_fcp_ddp_done(fsp);
820 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
821 rp_ex = (void *)(fc_rp + 1);
822 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
823 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
825 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
826 if (flags & FCP_RSP_LEN_VAL) {
827 respl = ntohl(rp_ex->fr_rsp_len);
828 if (respl != sizeof(*fc_rp_info))
830 if (fsp->wait_for_comp) {
831 /* Abuse cdb_status for rsp code */
832 fsp->cdb_status = fc_rp_info->rsp_code;
833 complete(&fsp->tm_done);
835 * tmfs will not have any scsi cmd so
842 if (flags & FCP_SNS_LEN_VAL) {
843 snsl = ntohl(rp_ex->fr_sns_len);
844 if (snsl > SCSI_SENSE_BUFFERSIZE)
845 snsl = SCSI_SENSE_BUFFERSIZE;
846 memcpy(fsp->cmd->sense_buffer,
847 (char *)fc_rp_info + respl, snsl);
850 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
851 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
853 if (flags & FCP_RESID_UNDER) {
854 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
856 * The cmnd->underflow is the minimum number of
857 * bytes that must be transfered for this
858 * command. Provided a sense condition is not
859 * present, make sure the actual amount
860 * transferred is at least the underflow value
863 if (!(flags & FCP_SNS_LEN_VAL) &&
864 (fc_rp->fr_status == 0) &&
865 (scsi_bufflen(fsp->cmd) -
866 fsp->scsi_resid) < fsp->cmd->underflow)
868 expected_len -= fsp->scsi_resid;
870 fsp->status_code = FC_ERROR;
874 fsp->state |= FC_SRB_RCV_STATUS;
877 * Check for missing or extra data frames.
879 if (unlikely(fsp->xfer_len != expected_len)) {
880 if (fsp->xfer_len < expected_len) {
882 * Some data may be queued locally,
883 * Wait a at least one jiffy to see if it is delivered.
884 * If this expires without data, we may do SRR.
886 fc_fcp_timer_set(fsp, 2);
889 fsp->status_code = FC_DATA_OVRRUN;
890 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, "
891 "len %x, data len %x\n",
893 fsp->xfer_len, expected_len, fsp->data_len);
895 fc_fcp_complete_locked(fsp);
899 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
900 "snsl %u\n", flags, fr_len(fp), respl, snsl);
902 fsp->status_code = FC_ERROR;
903 fc_fcp_complete_locked(fsp);
907 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
909 * @fsp: The FCP packet to be completed
911 * This function may sleep if a timer is pending. The packet lock must be
912 * held, and the host lock must not be held.
914 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
916 struct fc_lport *lport = fsp->lp;
921 if (fsp->state & FC_SRB_ABORT_PENDING)
924 if (fsp->state & FC_SRB_ABORTED) {
925 if (!fsp->status_code)
926 fsp->status_code = FC_CMD_ABORTED;
929 * Test for transport underrun, independent of response
932 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
933 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
934 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
935 fsp->status_code = FC_DATA_UNDRUN;
943 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
944 struct fc_frame *conf_frame;
947 csp = lport->tt.seq_start_next(seq);
948 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
950 f_ctl = FC_FC_SEQ_INIT;
951 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
952 ep = fc_seq_exch(seq);
953 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
955 FC_TYPE_FCP, f_ctl, 0);
956 lport->tt.seq_send(lport, csp, conf_frame);
959 lport->tt.exch_done(seq);
965 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
966 * @fsp: The FCP packet whose exchanges should be canceled
967 * @error: The reason for the cancellation
969 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
971 struct fc_lport *lport = fsp->lp;
974 lport->tt.exch_done(fsp->seq_ptr);
977 fsp->status_code = error;
981 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
982 * @lport: The local port whose exchanges should be canceled
983 * @id: The target's ID
985 * @error: The reason for cancellation
987 * If lun or id is -1, they are ignored.
989 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
990 unsigned int lun, int error)
992 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
993 struct fc_fcp_pkt *fsp;
994 struct scsi_cmnd *sc_cmd;
997 spin_lock_irqsave(&si->scsi_queue_lock, flags);
999 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1001 if (id != -1 && scmd_id(sc_cmd) != id)
1004 if (lun != -1 && sc_cmd->device->lun != lun)
1007 fc_fcp_pkt_hold(fsp);
1008 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1010 if (!fc_fcp_lock_pkt(fsp)) {
1011 fc_fcp_cleanup_cmd(fsp, error);
1013 fc_fcp_unlock_pkt(fsp);
1016 fc_fcp_pkt_release(fsp);
1017 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1019 * while we dropped the lock multiple pkts could
1020 * have been released, so we have to start over.
1024 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1028 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1029 * @lport: The local port whose exchanges are to be aborted
1031 static void fc_fcp_abort_io(struct fc_lport *lport)
1033 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1037 * fc_fcp_pkt_send() - Send a fcp_pkt
1038 * @lport: The local port to send the FCP packet on
1039 * @fsp: The FCP packet to send
1041 * Return: Zero for success and -1 for failure
1042 * Locks: Called without locks held
1044 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1046 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1047 unsigned long flags;
1050 fsp->cmd->SCp.ptr = (char *)fsp;
1051 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1052 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1054 int_to_scsilun(fsp->cmd->device->lun,
1055 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1056 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1058 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1059 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1060 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1061 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1063 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1064 list_del(&fsp->list);
1065 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1072 * fc_fcp_cmd_send() - Send a FCP command
1073 * @lport: The local port to send the command on
1074 * @fsp: The FCP packet the command is on
1075 * @resp: The handler for the response
1077 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1078 void (*resp)(struct fc_seq *,
1079 struct fc_frame *fp,
1082 struct fc_frame *fp;
1084 struct fc_rport *rport;
1085 struct fc_rport_libfc_priv *rpriv;
1086 const size_t len = sizeof(fsp->cdb_cmd);
1089 if (fc_fcp_lock_pkt(fsp))
1092 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1098 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1101 fsp->max_payload = rport->maxframe_size;
1102 rpriv = rport->dd_data;
1104 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1105 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP,
1106 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1108 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1114 fsp->last_pkt_time = jiffies;
1116 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1118 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1119 fc_fcp_timer_set(fsp,
1120 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1121 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1123 fc_fcp_unlock_pkt(fsp);
1128 * fc_fcp_error() - Handler for FCP layer errors
1129 * @fsp: The FCP packet the error is on
1130 * @fp: The frame that has errored
1132 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1134 int error = PTR_ERR(fp);
1136 if (fc_fcp_lock_pkt(fsp))
1139 if (error == -FC_EX_CLOSED) {
1140 fc_fcp_retry_cmd(fsp);
1145 * clear abort pending, because the lower layer
1146 * decided to force completion.
1148 fsp->state &= ~FC_SRB_ABORT_PENDING;
1149 fsp->status_code = FC_CMD_PLOGO;
1150 fc_fcp_complete_locked(fsp);
1152 fc_fcp_unlock_pkt(fsp);
1156 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1157 * @fsp: The FCP packet to abort on
1159 * Called to send an abort and then wait for abort completion
1161 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1165 if (fc_fcp_send_abort(fsp))
1168 init_completion(&fsp->tm_done);
1169 fsp->wait_for_comp = 1;
1171 spin_unlock_bh(&fsp->scsi_pkt_lock);
1172 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1173 spin_lock_bh(&fsp->scsi_pkt_lock);
1174 fsp->wait_for_comp = 0;
1177 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1179 } else if (fsp->state & FC_SRB_ABORTED) {
1180 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1182 fc_fcp_complete_locked(fsp);
1189 * fc_lun_reset_send() - Send LUN reset command
1190 * @data: The FCP packet that identifies the LUN to be reset
1192 static void fc_lun_reset_send(unsigned long data)
1194 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1195 struct fc_lport *lport = fsp->lp;
1196 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1197 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1199 if (fc_fcp_lock_pkt(fsp))
1201 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1202 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1203 fc_fcp_unlock_pkt(fsp);
1208 * fc_lun_reset() - Send a LUN RESET command to a device
1209 * and wait for the reply
1210 * @lport: The local port to sent the comand on
1211 * @fsp: The FCP packet that identifies the LUN to be reset
1212 * @id: The SCSI command ID
1213 * @lun: The LUN ID to be reset
1215 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1216 unsigned int id, unsigned int lun)
1220 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1221 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1222 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1224 fsp->wait_for_comp = 1;
1225 init_completion(&fsp->tm_done);
1227 fc_lun_reset_send((unsigned long)fsp);
1230 * wait for completion of reset
1231 * after that make sure all commands are terminated
1233 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1235 spin_lock_bh(&fsp->scsi_pkt_lock);
1236 fsp->state |= FC_SRB_COMPL;
1237 spin_unlock_bh(&fsp->scsi_pkt_lock);
1239 del_timer_sync(&fsp->timer);
1241 spin_lock_bh(&fsp->scsi_pkt_lock);
1243 lport->tt.exch_done(fsp->seq_ptr);
1244 fsp->seq_ptr = NULL;
1246 fsp->wait_for_comp = 0;
1247 spin_unlock_bh(&fsp->scsi_pkt_lock);
1250 FC_SCSI_DBG(lport, "lun reset failed\n");
1254 /* cdb_status holds the tmf's rsp code */
1255 if (fsp->cdb_status != FCP_TMF_CMPL)
1258 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1259 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1264 * fc_tm_done() - Task Managment response handler
1265 * @seq: The sequence that the response is on
1266 * @fp: The response frame
1267 * @arg: The FCP packet the response is for
1269 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1271 struct fc_fcp_pkt *fsp = arg;
1272 struct fc_frame_header *fh;
1276 * If there is an error just let it timeout or wait
1277 * for TMF to be aborted if it timedout.
1279 * scsi-eh will escalate for when either happens.
1284 if (fc_fcp_lock_pkt(fsp))
1288 * raced with eh timeout handler.
1290 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1291 spin_unlock_bh(&fsp->scsi_pkt_lock);
1295 fh = fc_frame_header_get(fp);
1296 if (fh->fh_type != FC_TYPE_BLS)
1297 fc_fcp_resp(fsp, fp);
1298 fsp->seq_ptr = NULL;
1299 fsp->lp->tt.exch_done(seq);
1301 fc_fcp_unlock_pkt(fsp);
1305 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1306 * @lport: The local port to be cleaned up
1308 static void fc_fcp_cleanup(struct fc_lport *lport)
1310 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1314 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1315 * @data: The FCP packet that has timed out
1317 * If REC is supported then just issue it and return. The REC exchange will
1318 * complete or time out and recovery can continue at that point. Otherwise,
1319 * if the response has been received without all the data it has been
1320 * ER_TIMEOUT since the response was received. If the response has not been
1321 * received we see if data was received recently. If it has been then we
1322 * continue waiting, otherwise, we abort the command.
1324 static void fc_fcp_timeout(unsigned long data)
1326 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1327 struct fc_rport *rport = fsp->rport;
1328 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1330 if (fc_fcp_lock_pkt(fsp))
1333 if (fsp->cdb_cmd.fc_tm_flags)
1336 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1338 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1340 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1342 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1343 else if (fsp->state & FC_SRB_RCV_STATUS)
1344 fc_fcp_complete_locked(fsp);
1346 fc_timeout_error(fsp);
1347 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1349 fc_fcp_unlock_pkt(fsp);
1353 * fc_fcp_rec() - Send a REC ELS request
1354 * @fsp: The FCP packet to send the REC request on
1356 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1358 struct fc_lport *lport;
1359 struct fc_frame *fp;
1360 struct fc_rport *rport;
1361 struct fc_rport_libfc_priv *rpriv;
1365 rpriv = rport->dd_data;
1366 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1367 fsp->status_code = FC_HRD_ERROR;
1369 fc_fcp_complete_locked(fsp);
1372 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1376 fr_seq(fp) = fsp->seq_ptr;
1377 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1378 fc_host_port_id(rpriv->local_port->host), FC_TYPE_ELS,
1379 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1380 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1381 fc_fcp_rec_resp, fsp,
1382 jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1383 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1387 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1388 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1390 fc_timeout_error(fsp);
1394 * fc_fcp_rec_resp() - Handler for REC ELS responses
1395 * @seq: The sequence the response is on
1396 * @fp: The response frame
1397 * @arg: The FCP packet the response is on
1399 * If the response is a reject then the scsi layer will handle
1400 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1401 * set the timeout and return. If the I/O was completed then complete the
1402 * exchange and tell the SCSI layer.
1404 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1406 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1407 struct fc_els_rec_acc *recp;
1408 struct fc_els_ls_rjt *rjt;
1412 enum dma_data_direction data_dir;
1414 struct fc_rport_libfc_priv *rpriv;
1417 fc_fcp_rec_error(fsp, fp);
1421 if (fc_fcp_lock_pkt(fsp))
1424 fsp->recov_retry = 0;
1425 opcode = fc_frame_payload_op(fp);
1426 if (opcode == ELS_LS_RJT) {
1427 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1428 switch (rjt->er_reason) {
1430 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1431 "reason %d expl %d\n",
1432 fsp->rport->port_id, rjt->er_reason,
1436 FC_FCP_DBG(fsp, "device does not support REC\n");
1437 rpriv = fsp->rport->dd_data;
1439 * if we do not spport RECs or got some bogus
1440 * reason then resetup timer so we check for
1443 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1444 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1449 * If no data transfer, the command frame got dropped
1450 * so we just retry. If data was transferred, we
1451 * lost the response but the target has no record,
1452 * so we abort and retry.
1454 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1455 fsp->xfer_len == 0) {
1456 fc_fcp_retry_cmd(fsp);
1459 fc_timeout_error(fsp);
1462 } else if (opcode == ELS_LS_ACC) {
1463 if (fsp->state & FC_SRB_ABORTED)
1466 data_dir = fsp->cmd->sc_data_direction;
1467 recp = fc_frame_payload_get(fp, sizeof(*recp));
1468 offset = ntohl(recp->reca_fc4value);
1469 e_stat = ntohl(recp->reca_e_stat);
1471 if (e_stat & ESB_ST_COMPLETE) {
1474 * The exchange is complete.
1476 * For output, we must've lost the response.
1477 * For input, all data must've been sent.
1478 * We lost may have lost the response
1479 * (and a confirmation was requested) and maybe
1482 * If all data received, send SRR
1483 * asking for response. If partial data received,
1484 * or gaps, SRR requests data at start of gap.
1485 * Recovery via SRR relies on in-order-delivery.
1487 if (data_dir == DMA_TO_DEVICE) {
1488 r_ctl = FC_RCTL_DD_CMD_STATUS;
1489 } else if (fsp->xfer_contig_end == offset) {
1490 r_ctl = FC_RCTL_DD_CMD_STATUS;
1492 offset = fsp->xfer_contig_end;
1493 r_ctl = FC_RCTL_DD_SOL_DATA;
1495 fc_fcp_srr(fsp, r_ctl, offset);
1496 } else if (e_stat & ESB_ST_SEQ_INIT) {
1499 * The remote port has the initiative, so just
1500 * keep waiting for it to complete.
1502 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1506 * The exchange is incomplete, we have seq. initiative.
1507 * Lost response with requested confirmation,
1508 * lost confirmation, lost transfer ready or
1511 * For output, if not all data was received, ask
1512 * for transfer ready to be repeated.
1514 * If we received or sent all the data, send SRR to
1517 * If we lost a response, we may have lost some read
1520 r_ctl = FC_RCTL_DD_SOL_DATA;
1521 if (data_dir == DMA_TO_DEVICE) {
1522 r_ctl = FC_RCTL_DD_CMD_STATUS;
1523 if (offset < fsp->data_len)
1524 r_ctl = FC_RCTL_DD_DATA_DESC;
1525 } else if (offset == fsp->xfer_contig_end) {
1526 r_ctl = FC_RCTL_DD_CMD_STATUS;
1527 } else if (fsp->xfer_contig_end < offset) {
1528 offset = fsp->xfer_contig_end;
1530 fc_fcp_srr(fsp, r_ctl, offset);
1534 fc_fcp_unlock_pkt(fsp);
1536 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1541 * fc_fcp_rec_error() - Handler for REC errors
1542 * @fsp: The FCP packet the error is on
1543 * @fp: The REC frame
1545 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1547 int error = PTR_ERR(fp);
1549 if (fc_fcp_lock_pkt(fsp))
1554 fc_fcp_retry_cmd(fsp);
1558 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
1559 fsp, fsp->rport->port_id, error);
1560 fsp->status_code = FC_CMD_PLOGO;
1563 case -FC_EX_TIMEOUT:
1565 * Assume REC or LS_ACC was lost.
1566 * The exchange manager will have aborted REC, so retry.
1568 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n",
1569 fsp->rport->port_id, error, fsp->recov_retry,
1570 FC_MAX_RECOV_RETRY);
1571 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1574 fc_timeout_error(fsp);
1577 fc_fcp_unlock_pkt(fsp);
1579 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1583 * fc_timeout_error() - Handler for fcp_pkt timeouts
1584 * @fsp: The FCP packt that has timed out
1586 static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1588 fsp->status_code = FC_CMD_TIME_OUT;
1589 fsp->cdb_status = 0;
1592 * if this fails then we let the scsi command timer fire and
1595 fc_fcp_send_abort(fsp);
1599 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1600 * @fsp: The FCP packet the SRR is to be sent on
1601 * @r_ctl: The R_CTL field for the SRR request
1602 * This is called after receiving status but insufficient data, or
1603 * when expecting status but the request has timed out.
1605 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1607 struct fc_lport *lport = fsp->lp;
1608 struct fc_rport *rport;
1609 struct fc_rport_libfc_priv *rpriv;
1610 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1612 struct fcp_srr *srr;
1613 struct fc_frame *fp;
1617 rpriv = rport->dd_data;
1618 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1620 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1621 rpriv->rp_state != RPORT_ST_READY)
1622 goto retry; /* shouldn't happen */
1623 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1627 srr = fc_frame_payload_get(fp, sizeof(*srr));
1628 memset(srr, 0, sizeof(*srr));
1629 srr->srr_op = ELS_SRR;
1630 srr->srr_ox_id = htons(ep->oxid);
1631 srr->srr_rx_id = htons(ep->rxid);
1632 srr->srr_r_ctl = r_ctl;
1633 srr->srr_rel_off = htonl(offset);
1635 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1636 fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP,
1637 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1639 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
1640 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1644 fsp->recov_seq = seq;
1645 fsp->xfer_len = offset;
1646 fsp->xfer_contig_end = offset;
1647 fsp->state &= ~FC_SRB_RCV_STATUS;
1648 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1651 fc_fcp_retry_cmd(fsp);
1655 * fc_fcp_srr_resp() - Handler for SRR response
1656 * @seq: The sequence the SRR is on
1657 * @fp: The SRR frame
1658 * @arg: The FCP packet the SRR is on
1660 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1662 struct fc_fcp_pkt *fsp = arg;
1663 struct fc_frame_header *fh;
1666 fc_fcp_srr_error(fsp, fp);
1670 if (fc_fcp_lock_pkt(fsp))
1673 fh = fc_frame_header_get(fp);
1675 * BUG? fc_fcp_srr_error calls exch_done which would release
1676 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1677 * then fc_exch_timeout would be sending an abort. The exch_done
1678 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1679 * an abort response though.
1681 if (fh->fh_type == FC_TYPE_BLS) {
1682 fc_fcp_unlock_pkt(fsp);
1686 fsp->recov_seq = NULL;
1687 switch (fc_frame_payload_op(fp)) {
1689 fsp->recov_retry = 0;
1690 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1694 fc_timeout_error(fsp);
1697 fc_fcp_unlock_pkt(fsp);
1698 fsp->lp->tt.exch_done(seq);
1701 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1705 * fc_fcp_srr_error() - Handler for SRR errors
1706 * @fsp: The FCP packet that the SRR error is on
1707 * @fp: The SRR frame
1709 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1711 if (fc_fcp_lock_pkt(fsp))
1713 fsp->lp->tt.exch_done(fsp->recov_seq);
1714 fsp->recov_seq = NULL;
1715 switch (PTR_ERR(fp)) {
1716 case -FC_EX_TIMEOUT:
1717 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1720 fc_timeout_error(fsp);
1722 case -FC_EX_CLOSED: /* e.g., link failure */
1725 fc_fcp_retry_cmd(fsp);
1728 fc_fcp_unlock_pkt(fsp);
1730 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1734 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1735 * @lport: The local port to be checked
1737 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1740 return (lport->state == LPORT_ST_READY) &&
1741 lport->link_up && !lport->qfull;
1745 * fc_queuecommand() - The queuecommand function of the SCSI template
1746 * @cmd: The scsi_cmnd to be executed
1747 * @done: The callback function to be called when the scsi_cmnd is complete
1749 * This is the i/o strategy routine, called by the SCSI layer. This routine
1750 * is called with the host_lock held.
1752 int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1754 struct fc_lport *lport;
1755 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1756 struct fc_fcp_pkt *fsp;
1757 struct fc_rport_libfc_priv *rpriv;
1760 struct fcoe_dev_stats *stats;
1762 lport = shost_priv(sc_cmd->device->host);
1763 spin_unlock_irq(lport->host->host_lock);
1765 rval = fc_remote_port_chkready(rport);
1767 sc_cmd->result = rval;
1772 if (!*(struct fc_remote_port **)rport->dd_data) {
1774 * rport is transitioning from blocked/deleted to
1777 sc_cmd->result = DID_IMM_RETRY << 16;
1782 rpriv = rport->dd_data;
1784 if (!fc_fcp_lport_queue_ready(lport)) {
1786 fc_fcp_can_queue_ramp_down(lport);
1787 rc = SCSI_MLQUEUE_HOST_BUSY;
1791 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1793 rc = SCSI_MLQUEUE_HOST_BUSY;
1798 * build the libfc request pkt
1800 fsp->cmd = sc_cmd; /* save the cmd */
1801 fsp->lp = lport; /* save the softc ptr */
1802 fsp->rport = rport; /* set the remote port ptr */
1803 fsp->xfer_ddp = FC_XID_UNKNOWN;
1804 sc_cmd->scsi_done = done;
1807 * set up the transfer length
1809 fsp->data_len = scsi_bufflen(sc_cmd);
1813 * setup the data direction
1815 stats = fc_lport_get_stats(lport);
1816 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1817 fsp->req_flags = FC_SRB_READ;
1818 stats->InputRequests++;
1819 stats->InputMegabytes = fsp->data_len;
1820 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1821 fsp->req_flags = FC_SRB_WRITE;
1822 stats->OutputRequests++;
1823 stats->OutputMegabytes = fsp->data_len;
1826 stats->ControlRequests++;
1829 fsp->tgt_flags = rpriv->flags;
1831 init_timer(&fsp->timer);
1832 fsp->timer.data = (unsigned long)fsp;
1835 * send it to the lower layer
1836 * if we get -1 return then put the request in the pending
1839 rval = fc_fcp_pkt_send(lport, fsp);
1841 fsp->state = FC_SRB_FREE;
1842 fc_fcp_pkt_release(fsp);
1843 rc = SCSI_MLQUEUE_HOST_BUSY;
1846 spin_lock_irq(lport->host->host_lock);
1849 EXPORT_SYMBOL(fc_queuecommand);
1852 * fc_io_compl() - Handle responses for completed commands
1853 * @fsp: The FCP packet that is complete
1855 * Translates fcp_pkt errors to a Linux SCSI errors.
1856 * The fcp packet lock must be held when calling.
1858 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1860 struct fc_fcp_internal *si;
1861 struct scsi_cmnd *sc_cmd;
1862 struct fc_lport *lport;
1863 unsigned long flags;
1865 /* release outstanding ddp context */
1866 fc_fcp_ddp_done(fsp);
1868 fsp->state |= FC_SRB_COMPL;
1869 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1870 spin_unlock_bh(&fsp->scsi_pkt_lock);
1871 del_timer_sync(&fsp->timer);
1872 spin_lock_bh(&fsp->scsi_pkt_lock);
1876 si = fc_get_scsi_internal(lport);
1881 * if can_queue ramp down is done then try can_queue ramp up
1882 * since commands are completing now.
1884 if (si->last_can_queue_ramp_down_time)
1885 fc_fcp_can_queue_ramp_up(lport);
1890 if (!sc_cmd->SCp.ptr)
1893 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1894 switch (fsp->status_code) {
1896 if (fsp->cdb_status == 0) {
1900 sc_cmd->result = DID_OK << 16;
1901 if (fsp->scsi_resid)
1902 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1905 * transport level I/O was ok but scsi
1906 * has non zero status
1908 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1912 sc_cmd->result = DID_ERROR << 16;
1914 case FC_DATA_UNDRUN:
1915 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1917 * scsi status is good but transport level
1920 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ?
1921 DID_OK : DID_ERROR) << 16;
1924 * scsi got underrun, this is an error
1926 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1927 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1930 case FC_DATA_OVRRUN:
1932 * overrun is an error
1934 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1936 case FC_CMD_ABORTED:
1937 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1939 case FC_CMD_TIME_OUT:
1940 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1943 sc_cmd->result = (DID_RESET << 16);
1946 sc_cmd->result = (DID_NO_CONNECT << 16);
1949 sc_cmd->result = (DID_ERROR << 16);
1953 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1954 list_del(&fsp->list);
1955 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1956 sc_cmd->SCp.ptr = NULL;
1957 sc_cmd->scsi_done(sc_cmd);
1959 /* release ref from initial allocation in queue command */
1960 fc_fcp_pkt_release(fsp);
1964 * fc_eh_abort() - Abort a command
1965 * @sc_cmd: The SCSI command to abort
1967 * From SCSI host template.
1968 * Send an ABTS to the target device and wait for the response.
1970 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1972 struct fc_fcp_pkt *fsp;
1973 struct fc_lport *lport;
1975 unsigned long flags;
1977 lport = shost_priv(sc_cmd->device->host);
1978 if (lport->state != LPORT_ST_READY)
1980 else if (!lport->link_up)
1983 spin_lock_irqsave(lport->host->host_lock, flags);
1984 fsp = CMD_SP(sc_cmd);
1986 /* command completed while scsi eh was setting up */
1987 spin_unlock_irqrestore(lport->host->host_lock, flags);
1990 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1991 fc_fcp_pkt_hold(fsp);
1992 spin_unlock_irqrestore(lport->host->host_lock, flags);
1994 if (fc_fcp_lock_pkt(fsp)) {
1995 /* completed while we were waiting for timer to be deleted */
2000 rc = fc_fcp_pkt_abort(fsp);
2001 fc_fcp_unlock_pkt(fsp);
2004 fc_fcp_pkt_release(fsp);
2007 EXPORT_SYMBOL(fc_eh_abort);
2010 * fc_eh_device_reset() - Reset a single LUN
2011 * @sc_cmd: The SCSI command which identifies the device whose
2012 * LUN is to be reset
2014 * Set from SCSI host template.
2016 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2018 struct fc_lport *lport;
2019 struct fc_fcp_pkt *fsp;
2020 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2024 rval = fc_remote_port_chkready(rport);
2028 lport = shost_priv(sc_cmd->device->host);
2030 if (lport->state != LPORT_ST_READY)
2033 FC_SCSI_DBG(lport, "Resetting rport (%6x)\n", rport->port_id);
2035 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2037 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2042 * Build the libfc request pkt. Do not set the scsi cmnd, because
2043 * the sc passed in is not setup for execution like when sent
2044 * through the queuecommand callout.
2046 fsp->lp = lport; /* save the softc ptr */
2047 fsp->rport = rport; /* set the remote port ptr */
2050 * flush outstanding commands
2052 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2053 fsp->state = FC_SRB_FREE;
2054 fc_fcp_pkt_release(fsp);
2059 EXPORT_SYMBOL(fc_eh_device_reset);
2062 * fc_eh_host_reset() - Reset a Scsi_Host.
2063 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2065 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2067 struct Scsi_Host *shost = sc_cmd->device->host;
2068 struct fc_lport *lport = shost_priv(shost);
2069 unsigned long wait_tmo;
2071 FC_SCSI_DBG(lport, "Resetting host\n");
2073 lport->tt.lport_reset(lport);
2074 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2075 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2079 if (fc_fcp_lport_queue_ready(lport)) {
2080 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2081 "on port (%6x)\n", fc_host_port_id(lport->host));
2084 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2085 "port (%6x) is not ready.\n",
2086 fc_host_port_id(lport->host));
2090 EXPORT_SYMBOL(fc_eh_host_reset);
2093 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2094 * @sdev: The SCSI device that identifies the SCSI host
2096 * Configures queue depth based on host's cmd_per_len. If not set
2097 * then we use the libfc default.
2099 int fc_slave_alloc(struct scsi_device *sdev)
2101 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2103 if (!rport || fc_remote_port_chkready(rport))
2106 if (sdev->tagged_supported)
2107 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2109 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2110 FC_FCP_DFLT_QUEUE_DEPTH);
2114 EXPORT_SYMBOL(fc_slave_alloc);
2117 * fc_change_queue_depth() - Change a device's queue depth
2118 * @sdev: The SCSI device whose queue depth is to change
2119 * @qdepth: The new queue depth
2120 * @reason: The resason for the change
2122 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2125 case SCSI_QDEPTH_DEFAULT:
2126 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2128 case SCSI_QDEPTH_QFULL:
2129 scsi_track_queue_full(sdev, qdepth);
2131 case SCSI_QDEPTH_RAMP_UP:
2132 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2137 return sdev->queue_depth;
2139 EXPORT_SYMBOL(fc_change_queue_depth);
2142 * fc_change_queue_type() - Change a device's queue type
2143 * @sdev: The SCSI device whose queue depth is to change
2144 * @tag_type: Identifier for queue type
2146 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2148 if (sdev->tagged_supported) {
2149 scsi_set_tag_type(sdev, tag_type);
2151 scsi_activate_tcq(sdev, sdev->queue_depth);
2153 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2159 EXPORT_SYMBOL(fc_change_queue_type);
2162 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2163 * @lport: The local port that no longer needs the FCP layer
2165 void fc_fcp_destroy(struct fc_lport *lport)
2167 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2169 if (!list_empty(&si->scsi_pkt_queue))
2170 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2171 "port (%6x)\n", fc_host_port_id(lport->host));
2173 mempool_destroy(si->scsi_pkt_pool);
2175 lport->scsi_priv = NULL;
2177 EXPORT_SYMBOL(fc_fcp_destroy);
2183 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2184 sizeof(struct fc_fcp_pkt),
2185 0, SLAB_HWCACHE_ALIGN, NULL);
2186 if (!scsi_pkt_cachep) {
2187 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2188 "module load failed!");
2195 void fc_destroy_fcp()
2197 if (scsi_pkt_cachep)
2198 kmem_cache_destroy(scsi_pkt_cachep);
2202 * fc_fcp_init() - Initialize the FCP layer for a local port
2203 * @lport: The local port to initialize the exchange layer for
2205 int fc_fcp_init(struct fc_lport *lport)
2208 struct fc_fcp_internal *si;
2210 if (!lport->tt.fcp_cmd_send)
2211 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2213 if (!lport->tt.fcp_cleanup)
2214 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2216 if (!lport->tt.fcp_abort_io)
2217 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2219 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2222 lport->scsi_priv = si;
2223 si->max_can_queue = lport->host->can_queue;
2224 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2225 spin_lock_init(&si->scsi_queue_lock);
2227 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2228 if (!si->scsi_pkt_pool) {
2238 EXPORT_SYMBOL(fc_fcp_init);