2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 * Maintained at www.Open-FCoE.org
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
30 #include <linux/slab.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_device.h>
36 #include <scsi/scsi_cmnd.h>
38 #include <scsi/fc/fc_fc2.h>
40 #include <scsi/libfc.h>
41 #include <scsi/fc_encode.h>
45 struct kmem_cache *scsi_pkt_cachep;
47 /* SRB state definitions */
48 #define FC_SRB_FREE 0 /* cmd is free */
49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
57 #define FC_SRB_READ (1 << 1)
58 #define FC_SRB_WRITE (1 << 0)
61 * The SCp.ptr should be tested and set under the host lock. NULL indicates
62 * that the command has been retruned to the scsi layer.
64 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
65 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
66 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
67 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
68 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
71 * struct fc_fcp_internal - FCP layer internal data
72 * @scsi_pkt_pool: Memory pool to draw FCP packets from
73 * @scsi_queue_lock: Protects the scsi_pkt_queue
74 * @scsi_pkt_queue: Current FCP packets
75 * @last_can_queue_ramp_down_time: ramp down time
76 * @last_can_queue_ramp_up_time: ramp up time
77 * @max_can_queue: max can_queue size
79 struct fc_fcp_internal {
80 mempool_t *scsi_pkt_pool;
81 spinlock_t scsi_queue_lock;
82 struct list_head scsi_pkt_queue;
83 unsigned long last_can_queue_ramp_down_time;
84 unsigned long last_can_queue_ramp_up_time;
88 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
92 * FC scsi I/O related functions
94 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
95 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
96 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
97 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
98 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
99 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
100 static void fc_fcp_recovery(struct fc_fcp_pkt *);
101 static void fc_fcp_timeout(unsigned long);
102 static void fc_fcp_rec(struct fc_fcp_pkt *);
103 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
104 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
105 static void fc_io_compl(struct fc_fcp_pkt *);
107 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
108 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
109 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
112 * command status codes
114 #define FC_COMPLETE 0
115 #define FC_CMD_ABORTED 1
116 #define FC_CMD_RESET 2
117 #define FC_CMD_PLOGO 3
119 #define FC_TRANS_ERR 5
120 #define FC_DATA_OVRRUN 6
121 #define FC_DATA_UNDRUN 7
123 #define FC_HRD_ERROR 9
124 #define FC_CMD_RECOVERY 10
127 * Error recovery timeout values.
129 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
130 #define FC_SCSI_TM_TOV (10 * HZ)
131 #define FC_SCSI_REC_TOV (2 * HZ)
132 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
133 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
135 #define FC_MAX_ERROR_CNT 5
136 #define FC_MAX_RECOV_RETRY 3
138 #define FC_FCP_DFLT_QUEUE_DEPTH 32
141 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
142 * @lport: The local port that the FCP packet is for
143 * @gfp: GFP flags for allocation
145 * Return value: fcp_pkt structure or null on allocation failure.
146 * Context: Can be called from process context, no lock is required.
148 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
150 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
151 struct fc_fcp_pkt *fsp;
153 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
155 memset(fsp, 0, sizeof(*fsp));
157 atomic_set(&fsp->ref_cnt, 1);
158 init_timer(&fsp->timer);
159 INIT_LIST_HEAD(&fsp->list);
160 spin_lock_init(&fsp->scsi_pkt_lock);
166 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
167 * @fsp: The FCP packet to be released
169 * Context: Can be called from process or interrupt context,
170 * no lock is required.
172 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
174 if (atomic_dec_and_test(&fsp->ref_cnt)) {
175 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
177 mempool_free(fsp, si->scsi_pkt_pool);
182 * fc_fcp_pkt_hold() - Hold a fcp_pkt
183 * @fsp: The FCP packet to be held
185 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
187 atomic_inc(&fsp->ref_cnt);
191 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
192 * @seq: The sequence that the FCP packet is on (required by destructor API)
193 * @fsp: The FCP packet to be released
195 * This routine is called by a destructor callback in the exch_seq_send()
196 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
197 * argument even though it is not used by this routine.
199 * Context: No locking required.
201 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
203 fc_fcp_pkt_release(fsp);
207 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
208 * @fsp: The FCP packet to be locked and incremented
210 * We should only return error if we return a command to SCSI-ml before
211 * getting a response. This can happen in cases where we send a abort, but
212 * do not wait for the response and the abort and command can be passing
213 * each other on the wire/network-layer.
215 * Note: this function locks the packet and gets a reference to allow
216 * callers to call the completion function while the lock is held and
217 * not have to worry about the packets refcount.
219 * TODO: Maybe we should just have callers grab/release the lock and
220 * have a function that they call to verify the fsp and grab a ref if
223 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
225 spin_lock_bh(&fsp->scsi_pkt_lock);
226 if (fsp->state & FC_SRB_COMPL) {
227 spin_unlock_bh(&fsp->scsi_pkt_lock);
231 fc_fcp_pkt_hold(fsp);
236 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
238 * @fsp: The FCP packet to be unlocked and decremented
240 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
242 spin_unlock_bh(&fsp->scsi_pkt_lock);
243 fc_fcp_pkt_release(fsp);
247 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
248 * @fsp: The FCP packet to start a timer for
249 * @delay: The timeout period for the timer
251 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
253 if (!(fsp->state & FC_SRB_COMPL))
254 mod_timer(&fsp->timer, jiffies + delay);
258 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
260 * @fsp: The FCP packet to abort exchanges on
262 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
267 fsp->state |= FC_SRB_ABORT_PENDING;
268 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
272 * fc_fcp_retry_cmd() - Retry a fcp_pkt
273 * @fsp: The FCP packet to be retried
275 * Sets the status code to be FC_ERROR and then calls
276 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
277 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
278 * The SCSI-ml will retry the command.
280 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
283 fsp->lp->tt.exch_done(fsp->seq_ptr);
287 fsp->state &= ~FC_SRB_ABORT_PENDING;
289 fsp->status_code = FC_ERROR;
290 fc_fcp_complete_locked(fsp);
294 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
295 * @fsp: The FCP packet that will manage the DDP frames
296 * @xid: The XID that will be used for the DDP exchange
298 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
300 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);
417 spin_lock_irqsave(lport->host->host_lock, flags);
418 fc_fcp_can_queue_ramp_down(lport);
419 spin_unlock_irqrestore(lport->host->host_lock, flags);
424 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
425 * @fsp: The FCP packet the data is on
426 * @fp: The data frame
428 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
430 struct scsi_cmnd *sc = fsp->cmd;
431 struct fc_lport *lport = fsp->lp;
432 struct fcoe_dev_stats *stats;
433 struct fc_frame_header *fh;
440 struct scatterlist *sg;
443 fh = fc_frame_header_get(fp);
444 offset = ntohl(fh->fh_parm_offset);
445 start_offset = offset;
446 len = fr_len(fp) - sizeof(*fh);
447 buf = fc_frame_payload_get(fp, 0);
450 * if this I/O is ddped then clear it
451 * and initiate recovery since data
452 * frames are expected to be placed
453 * directly in that case.
455 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
456 fc_fcp_ddp_done(fsp);
459 if (offset + len > fsp->data_len) {
460 /* this should never happen */
461 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
462 fc_frame_crc_check(fp))
464 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
465 "data_len %x\n", len, offset, fsp->data_len);
468 if (offset != fsp->xfer_len)
469 fsp->state |= FC_SRB_DISCONTIG;
471 sg = scsi_sglist(sc);
472 nents = scsi_sg_count(sc);
474 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
475 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
476 &offset, KM_SOFTIRQ0, NULL);
478 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
479 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
480 &offset, KM_SOFTIRQ0, &crc);
481 buf = fc_frame_payload_get(fp, 0);
483 crc = crc32(crc, buf + len, 4 - (len % 4));
485 if (~crc != le32_to_cpu(fr_crc(fp))) {
487 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
488 stats->ErrorFrames++;
489 /* per cpu count, not total count, but OK for limit */
490 if (stats->InvalidCRCCount++ < 5)
491 printk(KERN_WARNING "libfc: CRC error on data "
492 "frame for port (%6.6x)\n",
496 * Assume the frame is total garbage.
497 * We may have copied it over the good part
499 * If so, we need to retry the entire operation.
500 * Otherwise, ignore it.
502 if (fsp->state & FC_SRB_DISCONTIG)
508 if (fsp->xfer_contig_end == start_offset)
509 fsp->xfer_contig_end += copy_len;
510 fsp->xfer_len += copy_len;
513 * In the very rare event that this data arrived after the response
514 * and completes the transfer, call the completion handler.
516 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
517 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
518 fc_fcp_complete_locked(fsp);
521 fc_fcp_recovery(fsp);
525 * fc_fcp_send_data() - Send SCSI data to a target
526 * @fsp: The FCP packet the data is on
527 * @sp: The sequence the data is to be sent on
528 * @offset: The starting offset for this data request
529 * @seq_blen: The burst length for this data request
531 * Called after receiving a Transfer Ready data descriptor.
532 * If the LLD is capable of sequence offload then send down the
533 * seq_blen amount of data in single frame, otherwise send
534 * multiple frames of the maximum frame payload supported by
537 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
538 size_t offset, size_t seq_blen)
541 struct scsi_cmnd *sc;
542 struct scatterlist *sg;
543 struct fc_frame *fp = NULL;
544 struct fc_lport *lport = fsp->lp;
550 size_t frame_offset, fh_parm_offset;
555 int using_sg = lport->sg_supp;
558 WARN_ON(seq_blen <= 0);
559 if (unlikely(offset + seq_blen > fsp->data_len)) {
560 /* this should never happen */
561 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
562 "offset %zx\n", seq_blen, offset);
563 fc_fcp_send_abort(fsp);
565 } else if (offset != fsp->xfer_len) {
566 /* Out of Order Data Request - no problem, but unexpected. */
567 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
568 "seq_blen %zx offset %zx\n", seq_blen, offset);
572 * if LLD is capable of seq_offload then set transport
573 * burst length (t_blen) to seq_blen, otherwise set t_blen
574 * to max FC frame payload previously set in fsp->max_payload.
576 t_blen = fsp->max_payload;
577 if (lport->seq_offload) {
578 t_blen = min(seq_blen, (size_t)lport->lso_max);
579 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
580 fsp, seq_blen, lport->lso_max, t_blen);
584 t_blen &= ~(512 - 1); /* round down to block size */
587 remaining = seq_blen;
588 fh_parm_offset = frame_offset = offset;
590 seq = lport->tt.seq_start_next(seq);
591 f_ctl = FC_FC_REL_OFF;
594 sg = scsi_sglist(sc);
596 while (remaining > 0 && sg) {
597 if (offset >= sg->length) {
598 offset -= sg->length;
603 tlen = min(t_blen, remaining);
606 * TODO. Temporary workaround. fc_seq_send() can't
607 * handle odd lengths in non-linear skbs.
608 * This will be the final fragment only.
612 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
616 data = fc_frame_header_get(fp) + 1;
617 fh_parm_offset = frame_offset;
618 fr_max_payload(fp) = fsp->max_payload;
621 off = offset + sg->offset;
622 sg_bytes = min(tlen, sg->length - offset);
623 sg_bytes = min(sg_bytes,
624 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
625 page = sg_page(sg) + (off >> PAGE_SHIFT);
628 skb_fill_page_desc(fp_skb(fp),
629 skb_shinfo(fp_skb(fp))->nr_frags,
630 page, off & ~PAGE_MASK, sg_bytes);
631 fp_skb(fp)->data_len += sg_bytes;
632 fr_len(fp) += sg_bytes;
633 fp_skb(fp)->truesize += PAGE_SIZE;
636 * The scatterlist item may be bigger than PAGE_SIZE,
637 * but we must not cross pages inside the kmap.
639 page_addr = kmap_atomic(page, KM_SOFTIRQ0);
640 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
642 kunmap_atomic(page_addr, KM_SOFTIRQ0);
646 frame_offset += sg_bytes;
648 remaining -= sg_bytes;
650 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
655 * Send sequence with transfer sequence initiative in case
656 * this is last FCP frame of the sequence.
659 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
661 ep = fc_seq_exch(seq);
662 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
663 FC_TYPE_FCP, f_ctl, fh_parm_offset);
666 * send fragment using for a sequence.
668 error = lport->tt.seq_send(lport, seq, fp);
670 WARN_ON(1); /* send error should be rare */
671 fc_fcp_retry_cmd(fsp);
676 fsp->xfer_len += seq_blen; /* premature count? */
681 * fc_fcp_abts_resp() - Send an ABTS response
682 * @fsp: The FCP packet that is being aborted
683 * @fp: The response frame
685 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
688 struct fc_ba_rjt *brp;
689 struct fc_frame_header *fh;
691 fh = fc_frame_header_get(fp);
692 switch (fh->fh_r_ctl) {
696 brp = fc_frame_payload_get(fp, sizeof(*brp));
697 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
702 * we will let the command timeout
703 * and scsi-ml recover in this case,
704 * therefore cleared the ba_done flag.
710 fsp->state |= FC_SRB_ABORTED;
711 fsp->state &= ~FC_SRB_ABORT_PENDING;
713 if (fsp->wait_for_comp)
714 complete(&fsp->tm_done);
716 fc_fcp_complete_locked(fsp);
721 * fc_fcp_recv() - Reveive an FCP frame
722 * @seq: The sequence the frame is on
723 * @fp: The received frame
724 * @arg: The related FCP packet
726 * Context: Called from Soft IRQ context. Can not be called
727 * holding the FCP packet list lock.
729 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
731 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
732 struct fc_lport *lport = fsp->lp;
733 struct fc_frame_header *fh;
734 struct fcp_txrdy *dd;
739 fc_fcp_error(fsp, fp);
743 fh = fc_frame_header_get(fp);
744 r_ctl = fh->fh_r_ctl;
746 if (lport->state != LPORT_ST_READY)
748 if (fc_fcp_lock_pkt(fsp))
750 fsp->last_pkt_time = jiffies;
752 if (fh->fh_type == FC_TYPE_BLS) {
753 fc_fcp_abts_resp(fsp, fp);
757 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
760 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
762 * received XFER RDY from the target
763 * need to send data to the target
765 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
766 dd = fc_frame_payload_get(fp, sizeof(*dd));
769 rc = fc_fcp_send_data(fsp, seq,
770 (size_t) ntohl(dd->ft_data_ro),
771 (size_t) ntohl(dd->ft_burst_len));
773 seq->rec_data = fsp->xfer_len;
774 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
776 * received a DATA frame
777 * next we will copy the data to the system buffer
779 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
780 fc_fcp_recv_data(fsp, fp);
781 seq->rec_data = fsp->xfer_contig_end;
782 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
783 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
785 fc_fcp_resp(fsp, fp);
787 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
790 fc_fcp_unlock_pkt(fsp);
796 * fc_fcp_resp() - Handler for FCP responses
797 * @fsp: The FCP packet the response is for
798 * @fp: The response frame
800 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
802 struct fc_frame_header *fh;
803 struct fcp_resp *fc_rp;
804 struct fcp_resp_ext *rp_ex;
805 struct fcp_resp_rsp_info *fc_rp_info;
813 fh = (struct fc_frame_header *)fr_hdr(fp);
814 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
817 fc_rp = (struct fcp_resp *)(fh + 1);
818 fsp->cdb_status = fc_rp->fr_status;
819 flags = fc_rp->fr_flags;
820 fsp->scsi_comp_flags = flags;
821 expected_len = fsp->data_len;
823 /* if ddp, update xfer len */
824 fc_fcp_ddp_done(fsp);
826 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
827 rp_ex = (void *)(fc_rp + 1);
828 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
829 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
831 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
832 if (flags & FCP_RSP_LEN_VAL) {
833 respl = ntohl(rp_ex->fr_rsp_len);
834 if (respl != sizeof(*fc_rp_info))
836 if (fsp->wait_for_comp) {
837 /* Abuse cdb_status for rsp code */
838 fsp->cdb_status = fc_rp_info->rsp_code;
839 complete(&fsp->tm_done);
841 * tmfs will not have any scsi cmd so
847 if (flags & FCP_SNS_LEN_VAL) {
848 snsl = ntohl(rp_ex->fr_sns_len);
849 if (snsl > SCSI_SENSE_BUFFERSIZE)
850 snsl = SCSI_SENSE_BUFFERSIZE;
851 memcpy(fsp->cmd->sense_buffer,
852 (char *)fc_rp_info + respl, snsl);
855 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
856 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
858 if (flags & FCP_RESID_UNDER) {
859 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
861 * The cmnd->underflow is the minimum number of
862 * bytes that must be transfered for this
863 * command. Provided a sense condition is not
864 * present, make sure the actual amount
865 * transferred is at least the underflow value
868 if (!(flags & FCP_SNS_LEN_VAL) &&
869 (fc_rp->fr_status == 0) &&
870 (scsi_bufflen(fsp->cmd) -
871 fsp->scsi_resid) < fsp->cmd->underflow)
873 expected_len -= fsp->scsi_resid;
875 fsp->status_code = FC_ERROR;
879 fsp->state |= FC_SRB_RCV_STATUS;
882 * Check for missing or extra data frames.
884 if (unlikely(fsp->xfer_len != expected_len)) {
885 if (fsp->xfer_len < expected_len) {
887 * Some data may be queued locally,
888 * Wait a at least one jiffy to see if it is delivered.
889 * If this expires without data, we may do SRR.
891 fc_fcp_timer_set(fsp, 2);
894 fsp->status_code = FC_DATA_OVRRUN;
895 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
896 "len %x, data len %x\n",
898 fsp->xfer_len, expected_len, fsp->data_len);
900 fc_fcp_complete_locked(fsp);
904 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
905 "snsl %u\n", flags, fr_len(fp), respl, snsl);
907 fsp->status_code = FC_ERROR;
908 fc_fcp_complete_locked(fsp);
912 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
914 * @fsp: The FCP packet to be completed
916 * This function may sleep if a timer is pending. The packet lock must be
917 * held, and the host lock must not be held.
919 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
921 struct fc_lport *lport = fsp->lp;
926 if (fsp->state & FC_SRB_ABORT_PENDING)
929 if (fsp->state & FC_SRB_ABORTED) {
930 if (!fsp->status_code)
931 fsp->status_code = FC_CMD_ABORTED;
934 * Test for transport underrun, independent of response
937 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
938 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
939 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
940 fsp->status_code = FC_DATA_UNDRUN;
948 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
949 struct fc_frame *conf_frame;
952 csp = lport->tt.seq_start_next(seq);
953 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
955 f_ctl = FC_FC_SEQ_INIT;
956 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
957 ep = fc_seq_exch(seq);
958 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
960 FC_TYPE_FCP, f_ctl, 0);
961 lport->tt.seq_send(lport, csp, conf_frame);
964 lport->tt.exch_done(seq);
970 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
971 * @fsp: The FCP packet whose exchanges should be canceled
972 * @error: The reason for the cancellation
974 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
976 struct fc_lport *lport = fsp->lp;
979 lport->tt.exch_done(fsp->seq_ptr);
982 fsp->status_code = error;
986 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
987 * @lport: The local port whose exchanges should be canceled
988 * @id: The target's ID
990 * @error: The reason for cancellation
992 * If lun or id is -1, they are ignored.
994 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
995 unsigned int lun, int error)
997 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
998 struct fc_fcp_pkt *fsp;
999 struct scsi_cmnd *sc_cmd;
1000 unsigned long flags;
1002 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1004 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1006 if (id != -1 && scmd_id(sc_cmd) != id)
1009 if (lun != -1 && sc_cmd->device->lun != lun)
1012 fc_fcp_pkt_hold(fsp);
1013 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1015 if (!fc_fcp_lock_pkt(fsp)) {
1016 fc_fcp_cleanup_cmd(fsp, error);
1018 fc_fcp_unlock_pkt(fsp);
1021 fc_fcp_pkt_release(fsp);
1022 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1024 * while we dropped the lock multiple pkts could
1025 * have been released, so we have to start over.
1029 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1033 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1034 * @lport: The local port whose exchanges are to be aborted
1036 static void fc_fcp_abort_io(struct fc_lport *lport)
1038 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1042 * fc_fcp_pkt_send() - Send a fcp_pkt
1043 * @lport: The local port to send the FCP packet on
1044 * @fsp: The FCP packet to send
1046 * Return: Zero for success and -1 for failure
1047 * Locks: Called without locks held
1049 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1051 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1052 unsigned long flags;
1055 fsp->cmd->SCp.ptr = (char *)fsp;
1056 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1057 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1059 int_to_scsilun(fsp->cmd->device->lun,
1060 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1061 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1063 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1064 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1065 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1066 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1068 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1069 list_del(&fsp->list);
1070 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1077 * fc_fcp_cmd_send() - Send a FCP command
1078 * @lport: The local port to send the command on
1079 * @fsp: The FCP packet the command is on
1080 * @resp: The handler for the response
1082 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1083 void (*resp)(struct fc_seq *,
1084 struct fc_frame *fp,
1087 struct fc_frame *fp;
1089 struct fc_rport *rport;
1090 struct fc_rport_libfc_priv *rpriv;
1091 const size_t len = sizeof(fsp->cdb_cmd);
1094 if (fc_fcp_lock_pkt(fsp))
1097 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1103 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1106 fsp->max_payload = rport->maxframe_size;
1107 rpriv = rport->dd_data;
1109 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1110 rpriv->local_port->port_id, FC_TYPE_FCP,
1113 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1119 fsp->last_pkt_time = jiffies;
1121 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1123 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1124 fc_fcp_timer_set(fsp,
1125 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1126 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1128 fc_fcp_unlock_pkt(fsp);
1133 * fc_fcp_error() - Handler for FCP layer errors
1134 * @fsp: The FCP packet the error is on
1135 * @fp: The frame that has errored
1137 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1139 int error = PTR_ERR(fp);
1141 if (fc_fcp_lock_pkt(fsp))
1144 if (error == -FC_EX_CLOSED) {
1145 fc_fcp_retry_cmd(fsp);
1150 * clear abort pending, because the lower layer
1151 * decided to force completion.
1153 fsp->state &= ~FC_SRB_ABORT_PENDING;
1154 fsp->status_code = FC_CMD_PLOGO;
1155 fc_fcp_complete_locked(fsp);
1157 fc_fcp_unlock_pkt(fsp);
1161 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1162 * @fsp: The FCP packet to abort on
1164 * Called to send an abort and then wait for abort completion
1166 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1170 if (fc_fcp_send_abort(fsp))
1173 init_completion(&fsp->tm_done);
1174 fsp->wait_for_comp = 1;
1176 spin_unlock_bh(&fsp->scsi_pkt_lock);
1177 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1178 spin_lock_bh(&fsp->scsi_pkt_lock);
1179 fsp->wait_for_comp = 0;
1182 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1184 } else if (fsp->state & FC_SRB_ABORTED) {
1185 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1187 fc_fcp_complete_locked(fsp);
1194 * fc_lun_reset_send() - Send LUN reset command
1195 * @data: The FCP packet that identifies the LUN to be reset
1197 static void fc_lun_reset_send(unsigned long data)
1199 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1200 struct fc_lport *lport = fsp->lp;
1201 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1202 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1204 if (fc_fcp_lock_pkt(fsp))
1206 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1207 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1208 fc_fcp_unlock_pkt(fsp);
1213 * fc_lun_reset() - Send a LUN RESET command to a device
1214 * and wait for the reply
1215 * @lport: The local port to sent the comand on
1216 * @fsp: The FCP packet that identifies the LUN to be reset
1217 * @id: The SCSI command ID
1218 * @lun: The LUN ID to be reset
1220 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1221 unsigned int id, unsigned int lun)
1225 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1226 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1227 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1229 fsp->wait_for_comp = 1;
1230 init_completion(&fsp->tm_done);
1232 fc_lun_reset_send((unsigned long)fsp);
1235 * wait for completion of reset
1236 * after that make sure all commands are terminated
1238 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1240 spin_lock_bh(&fsp->scsi_pkt_lock);
1241 fsp->state |= FC_SRB_COMPL;
1242 spin_unlock_bh(&fsp->scsi_pkt_lock);
1244 del_timer_sync(&fsp->timer);
1246 spin_lock_bh(&fsp->scsi_pkt_lock);
1248 lport->tt.exch_done(fsp->seq_ptr);
1249 fsp->seq_ptr = NULL;
1251 fsp->wait_for_comp = 0;
1252 spin_unlock_bh(&fsp->scsi_pkt_lock);
1255 FC_SCSI_DBG(lport, "lun reset failed\n");
1259 /* cdb_status holds the tmf's rsp code */
1260 if (fsp->cdb_status != FCP_TMF_CMPL)
1263 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1264 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1269 * fc_tm_done() - Task Managment response handler
1270 * @seq: The sequence that the response is on
1271 * @fp: The response frame
1272 * @arg: The FCP packet the response is for
1274 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1276 struct fc_fcp_pkt *fsp = arg;
1277 struct fc_frame_header *fh;
1281 * If there is an error just let it timeout or wait
1282 * for TMF to be aborted if it timedout.
1284 * scsi-eh will escalate for when either happens.
1289 if (fc_fcp_lock_pkt(fsp))
1293 * raced with eh timeout handler.
1295 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1296 spin_unlock_bh(&fsp->scsi_pkt_lock);
1300 fh = fc_frame_header_get(fp);
1301 if (fh->fh_type != FC_TYPE_BLS)
1302 fc_fcp_resp(fsp, fp);
1303 fsp->seq_ptr = NULL;
1304 fsp->lp->tt.exch_done(seq);
1306 fc_fcp_unlock_pkt(fsp);
1310 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1311 * @lport: The local port to be cleaned up
1313 static void fc_fcp_cleanup(struct fc_lport *lport)
1315 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1319 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1320 * @data: The FCP packet that has timed out
1322 * If REC is supported then just issue it and return. The REC exchange will
1323 * complete or time out and recovery can continue at that point. Otherwise,
1324 * if the response has been received without all the data it has been
1325 * ER_TIMEOUT since the response was received. If the response has not been
1326 * received we see if data was received recently. If it has been then we
1327 * continue waiting, otherwise, we abort the command.
1329 static void fc_fcp_timeout(unsigned long data)
1331 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1332 struct fc_rport *rport = fsp->rport;
1333 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1335 if (fc_fcp_lock_pkt(fsp))
1338 if (fsp->cdb_cmd.fc_tm_flags)
1341 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1343 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1345 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1347 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1348 else if (fsp->state & FC_SRB_RCV_STATUS)
1349 fc_fcp_complete_locked(fsp);
1351 fc_fcp_recovery(fsp);
1352 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1354 fc_fcp_unlock_pkt(fsp);
1358 * fc_fcp_rec() - Send a REC ELS request
1359 * @fsp: The FCP packet to send the REC request on
1361 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1363 struct fc_lport *lport;
1364 struct fc_frame *fp;
1365 struct fc_rport *rport;
1366 struct fc_rport_libfc_priv *rpriv;
1370 rpriv = rport->dd_data;
1371 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1372 fsp->status_code = FC_HRD_ERROR;
1374 fc_fcp_complete_locked(fsp);
1377 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1381 fr_seq(fp) = fsp->seq_ptr;
1382 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1383 rpriv->local_port->port_id, FC_TYPE_ELS,
1385 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1386 fc_fcp_rec_resp, fsp,
1387 jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1388 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1392 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1393 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1395 fc_fcp_recovery(fsp);
1399 * fc_fcp_rec_resp() - Handler for REC ELS responses
1400 * @seq: The sequence the response is on
1401 * @fp: The response frame
1402 * @arg: The FCP packet the response is on
1404 * If the response is a reject then the scsi layer will handle
1405 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1406 * set the timeout and return. If the I/O was completed then complete the
1407 * exchange and tell the SCSI layer.
1409 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1411 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1412 struct fc_els_rec_acc *recp;
1413 struct fc_els_ls_rjt *rjt;
1417 enum dma_data_direction data_dir;
1419 struct fc_rport_libfc_priv *rpriv;
1422 fc_fcp_rec_error(fsp, fp);
1426 if (fc_fcp_lock_pkt(fsp))
1429 fsp->recov_retry = 0;
1430 opcode = fc_frame_payload_op(fp);
1431 if (opcode == ELS_LS_RJT) {
1432 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1433 switch (rjt->er_reason) {
1435 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1436 "reason %d expl %d\n",
1437 fsp->rport->port_id, rjt->er_reason,
1441 FC_FCP_DBG(fsp, "device does not support REC\n");
1442 rpriv = fsp->rport->dd_data;
1444 * if we do not spport RECs or got some bogus
1445 * reason then resetup timer so we check for
1448 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1449 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1454 * If no data transfer, the command frame got dropped
1455 * so we just retry. If data was transferred, we
1456 * lost the response but the target has no record,
1457 * so we abort and retry.
1459 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1460 fsp->xfer_len == 0) {
1461 fc_fcp_retry_cmd(fsp);
1464 fc_fcp_recovery(fsp);
1467 } else if (opcode == ELS_LS_ACC) {
1468 if (fsp->state & FC_SRB_ABORTED)
1471 data_dir = fsp->cmd->sc_data_direction;
1472 recp = fc_frame_payload_get(fp, sizeof(*recp));
1473 offset = ntohl(recp->reca_fc4value);
1474 e_stat = ntohl(recp->reca_e_stat);
1476 if (e_stat & ESB_ST_COMPLETE) {
1479 * The exchange is complete.
1481 * For output, we must've lost the response.
1482 * For input, all data must've been sent.
1483 * We lost may have lost the response
1484 * (and a confirmation was requested) and maybe
1487 * If all data received, send SRR
1488 * asking for response. If partial data received,
1489 * or gaps, SRR requests data at start of gap.
1490 * Recovery via SRR relies on in-order-delivery.
1492 if (data_dir == DMA_TO_DEVICE) {
1493 r_ctl = FC_RCTL_DD_CMD_STATUS;
1494 } else if (fsp->xfer_contig_end == offset) {
1495 r_ctl = FC_RCTL_DD_CMD_STATUS;
1497 offset = fsp->xfer_contig_end;
1498 r_ctl = FC_RCTL_DD_SOL_DATA;
1500 fc_fcp_srr(fsp, r_ctl, offset);
1501 } else if (e_stat & ESB_ST_SEQ_INIT) {
1504 * The remote port has the initiative, so just
1505 * keep waiting for it to complete.
1507 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1511 * The exchange is incomplete, we have seq. initiative.
1512 * Lost response with requested confirmation,
1513 * lost confirmation, lost transfer ready or
1516 * For output, if not all data was received, ask
1517 * for transfer ready to be repeated.
1519 * If we received or sent all the data, send SRR to
1522 * If we lost a response, we may have lost some read
1525 r_ctl = FC_RCTL_DD_SOL_DATA;
1526 if (data_dir == DMA_TO_DEVICE) {
1527 r_ctl = FC_RCTL_DD_CMD_STATUS;
1528 if (offset < fsp->data_len)
1529 r_ctl = FC_RCTL_DD_DATA_DESC;
1530 } else if (offset == fsp->xfer_contig_end) {
1531 r_ctl = FC_RCTL_DD_CMD_STATUS;
1532 } else if (fsp->xfer_contig_end < offset) {
1533 offset = fsp->xfer_contig_end;
1535 fc_fcp_srr(fsp, r_ctl, offset);
1539 fc_fcp_unlock_pkt(fsp);
1541 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1546 * fc_fcp_rec_error() - Handler for REC errors
1547 * @fsp: The FCP packet the error is on
1548 * @fp: The REC frame
1550 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1552 int error = PTR_ERR(fp);
1554 if (fc_fcp_lock_pkt(fsp))
1559 fc_fcp_retry_cmd(fsp);
1563 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1564 fsp, fsp->rport->port_id, error);
1565 fsp->status_code = FC_CMD_PLOGO;
1568 case -FC_EX_TIMEOUT:
1570 * Assume REC or LS_ACC was lost.
1571 * The exchange manager will have aborted REC, so retry.
1573 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
1574 fsp->rport->port_id, error, fsp->recov_retry,
1575 FC_MAX_RECOV_RETRY);
1576 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1579 fc_fcp_recovery(fsp);
1582 fc_fcp_unlock_pkt(fsp);
1584 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1588 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1589 * @fsp: The FCP pkt that needs to be aborted
1591 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp)
1593 fsp->status_code = FC_CMD_RECOVERY;
1594 fsp->cdb_status = 0;
1597 * if this fails then we let the scsi command timer fire and
1600 fc_fcp_send_abort(fsp);
1604 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1605 * @fsp: The FCP packet the SRR is to be sent on
1606 * @r_ctl: The R_CTL field for the SRR request
1607 * This is called after receiving status but insufficient data, or
1608 * when expecting status but the request has timed out.
1610 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1612 struct fc_lport *lport = fsp->lp;
1613 struct fc_rport *rport;
1614 struct fc_rport_libfc_priv *rpriv;
1615 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1617 struct fcp_srr *srr;
1618 struct fc_frame *fp;
1622 rpriv = rport->dd_data;
1623 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1625 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1626 rpriv->rp_state != RPORT_ST_READY)
1627 goto retry; /* shouldn't happen */
1628 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1632 srr = fc_frame_payload_get(fp, sizeof(*srr));
1633 memset(srr, 0, sizeof(*srr));
1634 srr->srr_op = ELS_SRR;
1635 srr->srr_ox_id = htons(ep->oxid);
1636 srr->srr_rx_id = htons(ep->rxid);
1637 srr->srr_r_ctl = r_ctl;
1638 srr->srr_rel_off = htonl(offset);
1640 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1641 rpriv->local_port->port_id, FC_TYPE_FCP,
1644 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
1645 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1649 fsp->recov_seq = seq;
1650 fsp->xfer_len = offset;
1651 fsp->xfer_contig_end = offset;
1652 fsp->state &= ~FC_SRB_RCV_STATUS;
1653 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1656 fc_fcp_retry_cmd(fsp);
1660 * fc_fcp_srr_resp() - Handler for SRR response
1661 * @seq: The sequence the SRR is on
1662 * @fp: The SRR frame
1663 * @arg: The FCP packet the SRR is on
1665 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1667 struct fc_fcp_pkt *fsp = arg;
1668 struct fc_frame_header *fh;
1671 fc_fcp_srr_error(fsp, fp);
1675 if (fc_fcp_lock_pkt(fsp))
1678 fh = fc_frame_header_get(fp);
1680 * BUG? fc_fcp_srr_error calls exch_done which would release
1681 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1682 * then fc_exch_timeout would be sending an abort. The exch_done
1683 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1684 * an abort response though.
1686 if (fh->fh_type == FC_TYPE_BLS) {
1687 fc_fcp_unlock_pkt(fsp);
1691 fsp->recov_seq = NULL;
1692 switch (fc_frame_payload_op(fp)) {
1694 fsp->recov_retry = 0;
1695 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1699 fc_fcp_recovery(fsp);
1702 fc_fcp_unlock_pkt(fsp);
1703 fsp->lp->tt.exch_done(seq);
1706 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1710 * fc_fcp_srr_error() - Handler for SRR errors
1711 * @fsp: The FCP packet that the SRR error is on
1712 * @fp: The SRR frame
1714 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1716 if (fc_fcp_lock_pkt(fsp))
1718 fsp->lp->tt.exch_done(fsp->recov_seq);
1719 fsp->recov_seq = NULL;
1720 switch (PTR_ERR(fp)) {
1721 case -FC_EX_TIMEOUT:
1722 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1725 fc_fcp_recovery(fsp);
1727 case -FC_EX_CLOSED: /* e.g., link failure */
1730 fc_fcp_retry_cmd(fsp);
1733 fc_fcp_unlock_pkt(fsp);
1735 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1739 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1740 * @lport: The local port to be checked
1742 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1745 return (lport->state == LPORT_ST_READY) &&
1746 lport->link_up && !lport->qfull;
1750 * fc_queuecommand() - The queuecommand function of the SCSI template
1751 * @cmd: The scsi_cmnd to be executed
1752 * @done: The callback function to be called when the scsi_cmnd is complete
1754 * This is the i/o strategy routine, called by the SCSI layer. This routine
1755 * is called with the host_lock held.
1757 int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1759 struct fc_lport *lport;
1760 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1761 struct fc_fcp_pkt *fsp;
1762 struct fc_rport_libfc_priv *rpriv;
1765 struct fcoe_dev_stats *stats;
1767 lport = shost_priv(sc_cmd->device->host);
1769 rval = fc_remote_port_chkready(rport);
1771 sc_cmd->result = rval;
1775 spin_unlock_irq(lport->host->host_lock);
1777 if (!*(struct fc_remote_port **)rport->dd_data) {
1779 * rport is transitioning from blocked/deleted to
1782 sc_cmd->result = DID_IMM_RETRY << 16;
1787 rpriv = rport->dd_data;
1789 if (!fc_fcp_lport_queue_ready(lport)) {
1791 fc_fcp_can_queue_ramp_down(lport);
1792 rc = SCSI_MLQUEUE_HOST_BUSY;
1796 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1798 rc = SCSI_MLQUEUE_HOST_BUSY;
1803 * build the libfc request pkt
1805 fsp->cmd = sc_cmd; /* save the cmd */
1806 fsp->lp = lport; /* save the softc ptr */
1807 fsp->rport = rport; /* set the remote port ptr */
1808 fsp->xfer_ddp = FC_XID_UNKNOWN;
1809 sc_cmd->scsi_done = done;
1812 * set up the transfer length
1814 fsp->data_len = scsi_bufflen(sc_cmd);
1818 * setup the data direction
1820 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1821 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1822 fsp->req_flags = FC_SRB_READ;
1823 stats->InputRequests++;
1824 stats->InputMegabytes = fsp->data_len;
1825 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1826 fsp->req_flags = FC_SRB_WRITE;
1827 stats->OutputRequests++;
1828 stats->OutputMegabytes = fsp->data_len;
1831 stats->ControlRequests++;
1835 fsp->tgt_flags = rpriv->flags;
1837 init_timer(&fsp->timer);
1838 fsp->timer.data = (unsigned long)fsp;
1841 * send it to the lower layer
1842 * if we get -1 return then put the request in the pending
1845 rval = fc_fcp_pkt_send(lport, fsp);
1847 fsp->state = FC_SRB_FREE;
1848 fc_fcp_pkt_release(fsp);
1849 rc = SCSI_MLQUEUE_HOST_BUSY;
1852 spin_lock_irq(lport->host->host_lock);
1855 EXPORT_SYMBOL(fc_queuecommand);
1858 * fc_io_compl() - Handle responses for completed commands
1859 * @fsp: The FCP packet that is complete
1861 * Translates fcp_pkt errors to a Linux SCSI errors.
1862 * The fcp packet lock must be held when calling.
1864 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1866 struct fc_fcp_internal *si;
1867 struct scsi_cmnd *sc_cmd;
1868 struct fc_lport *lport;
1869 unsigned long flags;
1871 /* release outstanding ddp context */
1872 fc_fcp_ddp_done(fsp);
1874 fsp->state |= FC_SRB_COMPL;
1875 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1876 spin_unlock_bh(&fsp->scsi_pkt_lock);
1877 del_timer_sync(&fsp->timer);
1878 spin_lock_bh(&fsp->scsi_pkt_lock);
1882 si = fc_get_scsi_internal(lport);
1887 * if can_queue ramp down is done then try can_queue ramp up
1888 * since commands are completing now.
1890 if (si->last_can_queue_ramp_down_time)
1891 fc_fcp_can_queue_ramp_up(lport);
1896 if (!sc_cmd->SCp.ptr)
1899 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1900 switch (fsp->status_code) {
1902 if (fsp->cdb_status == 0) {
1906 sc_cmd->result = DID_OK << 16;
1907 if (fsp->scsi_resid)
1908 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1911 * transport level I/O was ok but scsi
1912 * has non zero status
1914 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1918 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1919 "due to FC_ERROR\n");
1920 sc_cmd->result = DID_ERROR << 16;
1922 case FC_DATA_UNDRUN:
1923 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1925 * scsi status is good but transport level
1928 if (fsp->state & FC_SRB_RCV_STATUS) {
1929 sc_cmd->result = DID_OK << 16;
1931 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
1932 " due to FC_DATA_UNDRUN (trans)\n");
1933 sc_cmd->result = DID_ERROR << 16;
1937 * scsi got underrun, this is an error
1939 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1940 "due to FC_DATA_UNDRUN (scsi)\n");
1941 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1942 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1945 case FC_DATA_OVRRUN:
1947 * overrun is an error
1949 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1950 "due to FC_DATA_OVRRUN\n");
1951 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1953 case FC_CMD_ABORTED:
1954 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1955 "due to FC_CMD_ABORTED\n");
1956 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1958 case FC_CMD_RECOVERY:
1959 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1962 sc_cmd->result = (DID_RESET << 16);
1965 sc_cmd->result = (DID_NO_CONNECT << 16);
1968 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1969 "due to unknown error\n");
1970 sc_cmd->result = (DID_ERROR << 16);
1974 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) {
1975 sc_cmd->result = (DID_REQUEUE << 16);
1976 FC_FCP_DBG(fsp, "Returning DID_REQUEUE to scsi-ml\n");
1979 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1980 list_del(&fsp->list);
1981 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1982 sc_cmd->SCp.ptr = NULL;
1983 sc_cmd->scsi_done(sc_cmd);
1985 /* release ref from initial allocation in queue command */
1986 fc_fcp_pkt_release(fsp);
1990 * fc_eh_abort() - Abort a command
1991 * @sc_cmd: The SCSI command to abort
1993 * From SCSI host template.
1994 * Send an ABTS to the target device and wait for the response.
1996 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1998 struct fc_fcp_pkt *fsp;
1999 struct fc_lport *lport;
2001 unsigned long flags;
2003 lport = shost_priv(sc_cmd->device->host);
2004 if (lport->state != LPORT_ST_READY)
2006 else if (!lport->link_up)
2009 spin_lock_irqsave(lport->host->host_lock, flags);
2010 fsp = CMD_SP(sc_cmd);
2012 /* command completed while scsi eh was setting up */
2013 spin_unlock_irqrestore(lport->host->host_lock, flags);
2016 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2017 fc_fcp_pkt_hold(fsp);
2018 spin_unlock_irqrestore(lport->host->host_lock, flags);
2020 if (fc_fcp_lock_pkt(fsp)) {
2021 /* completed while we were waiting for timer to be deleted */
2026 rc = fc_fcp_pkt_abort(fsp);
2027 fc_fcp_unlock_pkt(fsp);
2030 fc_fcp_pkt_release(fsp);
2033 EXPORT_SYMBOL(fc_eh_abort);
2036 * fc_eh_device_reset() - Reset a single LUN
2037 * @sc_cmd: The SCSI command which identifies the device whose
2038 * LUN is to be reset
2040 * Set from SCSI host template.
2042 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2044 struct fc_lport *lport;
2045 struct fc_fcp_pkt *fsp;
2046 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2050 rval = fc_remote_port_chkready(rport);
2054 lport = shost_priv(sc_cmd->device->host);
2056 if (lport->state != LPORT_ST_READY)
2059 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2061 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2063 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2068 * Build the libfc request pkt. Do not set the scsi cmnd, because
2069 * the sc passed in is not setup for execution like when sent
2070 * through the queuecommand callout.
2072 fsp->lp = lport; /* save the softc ptr */
2073 fsp->rport = rport; /* set the remote port ptr */
2076 * flush outstanding commands
2078 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2079 fsp->state = FC_SRB_FREE;
2080 fc_fcp_pkt_release(fsp);
2085 EXPORT_SYMBOL(fc_eh_device_reset);
2088 * fc_eh_host_reset() - Reset a Scsi_Host.
2089 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2091 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2093 struct Scsi_Host *shost = sc_cmd->device->host;
2094 struct fc_lport *lport = shost_priv(shost);
2095 unsigned long wait_tmo;
2097 FC_SCSI_DBG(lport, "Resetting host\n");
2099 lport->tt.lport_reset(lport);
2100 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2101 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2105 if (fc_fcp_lport_queue_ready(lport)) {
2106 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2107 "on port (%6.6x)\n", lport->port_id);
2110 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2111 "port (%6.6x) is not ready.\n",
2116 EXPORT_SYMBOL(fc_eh_host_reset);
2119 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2120 * @sdev: The SCSI device that identifies the SCSI host
2122 * Configures queue depth based on host's cmd_per_len. If not set
2123 * then we use the libfc default.
2125 int fc_slave_alloc(struct scsi_device *sdev)
2127 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2129 if (!rport || fc_remote_port_chkready(rport))
2132 if (sdev->tagged_supported)
2133 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2135 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2136 FC_FCP_DFLT_QUEUE_DEPTH);
2140 EXPORT_SYMBOL(fc_slave_alloc);
2143 * fc_change_queue_depth() - Change a device's queue depth
2144 * @sdev: The SCSI device whose queue depth is to change
2145 * @qdepth: The new queue depth
2146 * @reason: The resason for the change
2148 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2151 case SCSI_QDEPTH_DEFAULT:
2152 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2154 case SCSI_QDEPTH_QFULL:
2155 scsi_track_queue_full(sdev, qdepth);
2157 case SCSI_QDEPTH_RAMP_UP:
2158 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2163 return sdev->queue_depth;
2165 EXPORT_SYMBOL(fc_change_queue_depth);
2168 * fc_change_queue_type() - Change a device's queue type
2169 * @sdev: The SCSI device whose queue depth is to change
2170 * @tag_type: Identifier for queue type
2172 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2174 if (sdev->tagged_supported) {
2175 scsi_set_tag_type(sdev, tag_type);
2177 scsi_activate_tcq(sdev, sdev->queue_depth);
2179 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2185 EXPORT_SYMBOL(fc_change_queue_type);
2188 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2189 * @lport: The local port that no longer needs the FCP layer
2191 void fc_fcp_destroy(struct fc_lport *lport)
2193 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2195 if (!list_empty(&si->scsi_pkt_queue))
2196 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2197 "port (%6.6x)\n", lport->port_id);
2199 mempool_destroy(si->scsi_pkt_pool);
2201 lport->scsi_priv = NULL;
2203 EXPORT_SYMBOL(fc_fcp_destroy);
2209 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2210 sizeof(struct fc_fcp_pkt),
2211 0, SLAB_HWCACHE_ALIGN, NULL);
2212 if (!scsi_pkt_cachep) {
2213 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2214 "module load failed!");
2221 void fc_destroy_fcp()
2223 if (scsi_pkt_cachep)
2224 kmem_cache_destroy(scsi_pkt_cachep);
2228 * fc_fcp_init() - Initialize the FCP layer for a local port
2229 * @lport: The local port to initialize the exchange layer for
2231 int fc_fcp_init(struct fc_lport *lport)
2234 struct fc_fcp_internal *si;
2236 if (!lport->tt.fcp_cmd_send)
2237 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2239 if (!lport->tt.fcp_cleanup)
2240 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2242 if (!lport->tt.fcp_abort_io)
2243 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2245 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2248 lport->scsi_priv = si;
2249 si->max_can_queue = lport->host->can_queue;
2250 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2251 spin_lock_init(&si->scsi_queue_lock);
2253 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2254 if (!si->scsi_pkt_pool) {
2264 EXPORT_SYMBOL(fc_fcp_init);