2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 * Maintained at www.Open-FCoE.org
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
30 #include <linux/slab.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_device.h>
36 #include <scsi/scsi_cmnd.h>
38 #include <scsi/fc/fc_fc2.h>
40 #include <scsi/libfc.h>
41 #include <scsi/fc_encode.h>
45 static struct kmem_cache *scsi_pkt_cachep;
47 /* SRB state definitions */
48 #define FC_SRB_FREE 0 /* cmd is free */
49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
57 #define FC_SRB_READ (1 << 1)
58 #define FC_SRB_WRITE (1 << 0)
61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
63 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
64 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
65 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
66 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
67 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
70 * struct fc_fcp_internal - FCP layer internal data
71 * @scsi_pkt_pool: Memory pool to draw FCP packets from
72 * @scsi_queue_lock: Protects the scsi_pkt_queue
73 * @scsi_pkt_queue: Current FCP packets
74 * @last_can_queue_ramp_down_time: ramp down time
75 * @last_can_queue_ramp_up_time: ramp up time
76 * @max_can_queue: max can_queue size
78 struct fc_fcp_internal {
79 mempool_t *scsi_pkt_pool;
80 spinlock_t scsi_queue_lock;
81 struct list_head scsi_pkt_queue;
82 unsigned long last_can_queue_ramp_down_time;
83 unsigned long last_can_queue_ramp_up_time;
87 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
91 * FC scsi I/O related functions
93 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
94 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
95 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
96 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
97 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
98 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
99 static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
100 static void fc_fcp_timeout(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_CRC_ERROR 10
124 #define FC_TIMED_OUT 11
127 * Error recovery timeout values.
129 #define FC_SCSI_TM_TOV (10 * HZ)
130 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
131 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
133 #define FC_MAX_ERROR_CNT 5
134 #define FC_MAX_RECOV_RETRY 3
136 #define FC_FCP_DFLT_QUEUE_DEPTH 32
139 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
140 * @lport: The local port that the FCP packet is for
141 * @gfp: GFP flags for allocation
143 * Return value: fcp_pkt structure or null on allocation failure.
144 * Context: Can be called from process context, no lock is required.
146 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
149 struct fc_fcp_pkt *fsp;
151 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
153 memset(fsp, 0, sizeof(*fsp));
155 fsp->xfer_ddp = FC_XID_UNKNOWN;
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 in jiffies
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;
302 if ((fsp->req_flags & FC_SRB_READ) &&
303 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
304 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
305 scsi_sg_count(fsp->cmd)))
311 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
312 * DDP related resources for a fcp_pkt
313 * @fsp: The FCP packet that DDP had been used on
315 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
317 struct fc_lport *lport;
322 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
326 if (lport->tt.ddp_done) {
327 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
328 fsp->xfer_ddp = FC_XID_UNKNOWN;
333 * fc_fcp_can_queue_ramp_up() - increases can_queue
334 * @lport: lport to ramp up can_queue
336 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
338 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
342 spin_lock_irqsave(lport->host->host_lock, flags);
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);
365 spin_unlock_irqrestore(lport->host->host_lock, flags);
369 * fc_fcp_can_queue_ramp_down() - reduces can_queue
370 * @lport: lport to reduce can_queue
372 * If we are getting memory allocation failures, then we may
373 * be trying to execute too many commands. We let the running
374 * commands complete or timeout, then try again with a reduced
375 * can_queue. Eventually we will hit the point where we run
376 * on all reserved structs.
378 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
380 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
384 spin_lock_irqsave(lport->host->host_lock, flags);
386 if (si->last_can_queue_ramp_down_time &&
387 (time_before(jiffies, si->last_can_queue_ramp_down_time +
388 FC_CAN_QUEUE_PERIOD)))
391 si->last_can_queue_ramp_down_time = jiffies;
393 can_queue = lport->host->can_queue;
397 lport->host->can_queue = can_queue;
398 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
399 "Reducing can_queue to %d.\n", can_queue);
402 spin_unlock_irqrestore(lport->host->host_lock, flags);
406 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
407 * @lport: fc lport struct
408 * @len: payload length
410 * Allocates fc_frame structure and buffer but if fails to allocate
411 * then reduce can_queue.
413 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
418 fp = fc_frame_alloc(lport, len);
423 fc_fcp_can_queue_ramp_down(lport);
428 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
429 * @fsp: The FCP packet the data is on
430 * @fp: The data frame
432 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
434 struct scsi_cmnd *sc = fsp->cmd;
435 struct fc_lport *lport = fsp->lp;
436 struct fcoe_dev_stats *stats;
437 struct fc_frame_header *fh;
444 struct scatterlist *sg;
446 u8 host_bcode = FC_COMPLETE;
448 fh = fc_frame_header_get(fp);
449 offset = ntohl(fh->fh_parm_offset);
450 start_offset = offset;
451 len = fr_len(fp) - sizeof(*fh);
452 buf = fc_frame_payload_get(fp, 0);
455 * if this I/O is ddped then clear it and initiate recovery since data
456 * frames are expected to be placed directly in that case.
458 * Indicate error to scsi-ml because something went wrong with the
459 * ddp handling to get us here.
461 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
462 fc_fcp_ddp_done(fsp);
463 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
464 host_bcode = FC_ERROR;
467 if (offset + len > fsp->data_len) {
468 /* this should never happen */
469 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
470 fc_frame_crc_check(fp))
472 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
473 "data_len %x\n", len, offset, fsp->data_len);
475 /* Data is corrupted indicate scsi-ml should retry */
476 host_bcode = FC_DATA_OVRRUN;
479 if (offset != fsp->xfer_len)
480 fsp->state |= FC_SRB_DISCONTIG;
482 sg = scsi_sglist(sc);
483 nents = scsi_sg_count(sc);
485 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
486 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
487 &offset, KM_SOFTIRQ0, NULL);
489 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
490 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
491 &offset, KM_SOFTIRQ0, &crc);
492 buf = fc_frame_payload_get(fp, 0);
494 crc = crc32(crc, buf + len, 4 - (len % 4));
496 if (~crc != le32_to_cpu(fr_crc(fp))) {
498 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
499 stats->ErrorFrames++;
500 /* per cpu count, not total count, but OK for limit */
501 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
502 printk(KERN_WARNING "libfc: CRC error on data "
503 "frame for port (%6.6x)\n",
507 * Assume the frame is total garbage.
508 * We may have copied it over the good part
510 * If so, we need to retry the entire operation.
511 * Otherwise, ignore it.
513 if (fsp->state & FC_SRB_DISCONTIG) {
514 host_bcode = FC_CRC_ERROR;
521 if (fsp->xfer_contig_end == start_offset)
522 fsp->xfer_contig_end += copy_len;
523 fsp->xfer_len += copy_len;
526 * In the very rare event that this data arrived after the response
527 * and completes the transfer, call the completion handler.
529 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
530 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
531 fc_fcp_complete_locked(fsp);
534 fc_fcp_recovery(fsp, host_bcode);
538 * fc_fcp_send_data() - Send SCSI data to a target
539 * @fsp: The FCP packet the data is on
540 * @sp: The sequence the data is to be sent on
541 * @offset: The starting offset for this data request
542 * @seq_blen: The burst length for this data request
544 * Called after receiving a Transfer Ready data descriptor.
545 * If the LLD is capable of sequence offload then send down the
546 * seq_blen amount of data in single frame, otherwise send
547 * multiple frames of the maximum frame payload supported by
550 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
551 size_t offset, size_t seq_blen)
554 struct scsi_cmnd *sc;
555 struct scatterlist *sg;
556 struct fc_frame *fp = NULL;
557 struct fc_lport *lport = fsp->lp;
563 size_t frame_offset, fh_parm_offset;
568 int using_sg = lport->sg_supp;
571 WARN_ON(seq_blen <= 0);
572 if (unlikely(offset + seq_blen > fsp->data_len)) {
573 /* this should never happen */
574 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
575 "offset %zx\n", seq_blen, offset);
576 fc_fcp_send_abort(fsp);
578 } else if (offset != fsp->xfer_len) {
579 /* Out of Order Data Request - no problem, but unexpected. */
580 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
581 "seq_blen %zx offset %zx\n", seq_blen, offset);
585 * if LLD is capable of seq_offload then set transport
586 * burst length (t_blen) to seq_blen, otherwise set t_blen
587 * to max FC frame payload previously set in fsp->max_payload.
589 t_blen = fsp->max_payload;
590 if (lport->seq_offload) {
591 t_blen = min(seq_blen, (size_t)lport->lso_max);
592 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
593 fsp, seq_blen, lport->lso_max, t_blen);
597 t_blen &= ~(512 - 1); /* round down to block size */
600 remaining = seq_blen;
601 fh_parm_offset = frame_offset = offset;
603 seq = lport->tt.seq_start_next(seq);
604 f_ctl = FC_FC_REL_OFF;
607 sg = scsi_sglist(sc);
609 while (remaining > 0 && sg) {
610 if (offset >= sg->length) {
611 offset -= sg->length;
616 tlen = min(t_blen, remaining);
619 * TODO. Temporary workaround. fc_seq_send() can't
620 * handle odd lengths in non-linear skbs.
621 * This will be the final fragment only.
625 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
629 data = fc_frame_header_get(fp) + 1;
630 fh_parm_offset = frame_offset;
631 fr_max_payload(fp) = fsp->max_payload;
634 off = offset + sg->offset;
635 sg_bytes = min(tlen, sg->length - offset);
636 sg_bytes = min(sg_bytes,
637 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
638 page = sg_page(sg) + (off >> PAGE_SHIFT);
641 skb_fill_page_desc(fp_skb(fp),
642 skb_shinfo(fp_skb(fp))->nr_frags,
643 page, off & ~PAGE_MASK, sg_bytes);
644 fp_skb(fp)->data_len += sg_bytes;
645 fr_len(fp) += sg_bytes;
646 fp_skb(fp)->truesize += PAGE_SIZE;
649 * The scatterlist item may be bigger than PAGE_SIZE,
650 * but we must not cross pages inside the kmap.
652 page_addr = kmap_atomic(page, KM_SOFTIRQ0);
653 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
655 kunmap_atomic(page_addr, KM_SOFTIRQ0);
659 frame_offset += sg_bytes;
661 remaining -= sg_bytes;
663 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
668 * Send sequence with transfer sequence initiative in case
669 * this is last FCP frame of the sequence.
672 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
674 ep = fc_seq_exch(seq);
675 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
676 FC_TYPE_FCP, f_ctl, fh_parm_offset);
679 * send fragment using for a sequence.
681 error = lport->tt.seq_send(lport, seq, fp);
683 WARN_ON(1); /* send error should be rare */
688 fsp->xfer_len += seq_blen; /* premature count? */
693 * fc_fcp_abts_resp() - Receive an ABTS response
694 * @fsp: The FCP packet that is being aborted
695 * @fp: The response frame
697 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
700 struct fc_ba_rjt *brp;
701 struct fc_frame_header *fh;
703 fh = fc_frame_header_get(fp);
704 switch (fh->fh_r_ctl) {
708 brp = fc_frame_payload_get(fp, sizeof(*brp));
709 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
714 * we will let the command timeout
715 * and scsi-ml recover in this case,
716 * therefore cleared the ba_done flag.
722 fsp->state |= FC_SRB_ABORTED;
723 fsp->state &= ~FC_SRB_ABORT_PENDING;
725 if (fsp->wait_for_comp)
726 complete(&fsp->tm_done);
728 fc_fcp_complete_locked(fsp);
733 * fc_fcp_recv() - Receive an FCP frame
734 * @seq: The sequence the frame is on
735 * @fp: The received frame
736 * @arg: The related FCP packet
738 * Context: Called from Soft IRQ context. Can not be called
739 * holding the FCP packet list lock.
741 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
743 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
744 struct fc_lport *lport = fsp->lp;
745 struct fc_frame_header *fh;
746 struct fcp_txrdy *dd;
751 fc_fcp_error(fsp, fp);
755 fh = fc_frame_header_get(fp);
756 r_ctl = fh->fh_r_ctl;
758 if (lport->state != LPORT_ST_READY)
760 if (fc_fcp_lock_pkt(fsp))
763 if (fh->fh_type == FC_TYPE_BLS) {
764 fc_fcp_abts_resp(fsp, fp);
768 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
771 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
773 * received XFER RDY from the target
774 * need to send data to the target
776 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
777 dd = fc_frame_payload_get(fp, sizeof(*dd));
780 rc = fc_fcp_send_data(fsp, seq,
781 (size_t) ntohl(dd->ft_data_ro),
782 (size_t) ntohl(dd->ft_burst_len));
784 seq->rec_data = fsp->xfer_len;
785 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
787 * received a DATA frame
788 * next we will copy the data to the system buffer
790 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
791 fc_fcp_recv_data(fsp, fp);
792 seq->rec_data = fsp->xfer_contig_end;
793 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
794 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
796 fc_fcp_resp(fsp, fp);
798 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
801 fc_fcp_unlock_pkt(fsp);
807 * fc_fcp_resp() - Handler for FCP responses
808 * @fsp: The FCP packet the response is for
809 * @fp: The response frame
811 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
813 struct fc_frame_header *fh;
814 struct fcp_resp *fc_rp;
815 struct fcp_resp_ext *rp_ex;
816 struct fcp_resp_rsp_info *fc_rp_info;
824 fh = (struct fc_frame_header *)fr_hdr(fp);
825 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
828 fc_rp = (struct fcp_resp *)(fh + 1);
829 fsp->cdb_status = fc_rp->fr_status;
830 flags = fc_rp->fr_flags;
831 fsp->scsi_comp_flags = flags;
832 expected_len = fsp->data_len;
834 /* if ddp, update xfer len */
835 fc_fcp_ddp_done(fsp);
837 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
838 rp_ex = (void *)(fc_rp + 1);
839 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
840 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
842 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
843 if (flags & FCP_RSP_LEN_VAL) {
844 respl = ntohl(rp_ex->fr_rsp_len);
845 if (respl != sizeof(*fc_rp_info))
847 if (fsp->wait_for_comp) {
848 /* Abuse cdb_status for rsp code */
849 fsp->cdb_status = fc_rp_info->rsp_code;
850 complete(&fsp->tm_done);
852 * tmfs will not have any scsi cmd so
858 if (flags & FCP_SNS_LEN_VAL) {
859 snsl = ntohl(rp_ex->fr_sns_len);
860 if (snsl > SCSI_SENSE_BUFFERSIZE)
861 snsl = SCSI_SENSE_BUFFERSIZE;
862 memcpy(fsp->cmd->sense_buffer,
863 (char *)fc_rp_info + respl, snsl);
866 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
867 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
869 if (flags & FCP_RESID_UNDER) {
870 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
872 * The cmnd->underflow is the minimum number of
873 * bytes that must be transferred for this
874 * command. Provided a sense condition is not
875 * present, make sure the actual amount
876 * transferred is at least the underflow value
879 if (!(flags & FCP_SNS_LEN_VAL) &&
880 (fc_rp->fr_status == 0) &&
881 (scsi_bufflen(fsp->cmd) -
882 fsp->scsi_resid) < fsp->cmd->underflow)
884 expected_len -= fsp->scsi_resid;
886 fsp->status_code = FC_ERROR;
890 fsp->state |= FC_SRB_RCV_STATUS;
893 * Check for missing or extra data frames.
895 if (unlikely(fsp->xfer_len != expected_len)) {
896 if (fsp->xfer_len < expected_len) {
898 * Some data may be queued locally,
899 * Wait a at least one jiffy to see if it is delivered.
900 * If this expires without data, we may do SRR.
902 fc_fcp_timer_set(fsp, 2);
905 fsp->status_code = FC_DATA_OVRRUN;
906 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
907 "len %x, data len %x\n",
909 fsp->xfer_len, expected_len, fsp->data_len);
911 fc_fcp_complete_locked(fsp);
915 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
916 "snsl %u\n", flags, fr_len(fp), respl, snsl);
918 fsp->status_code = FC_ERROR;
919 fc_fcp_complete_locked(fsp);
923 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
925 * @fsp: The FCP packet to be completed
927 * This function may sleep if a timer is pending. The packet lock must be
928 * held, and the host lock must not be held.
930 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
932 struct fc_lport *lport = fsp->lp;
937 if (fsp->state & FC_SRB_ABORT_PENDING)
940 if (fsp->state & FC_SRB_ABORTED) {
941 if (!fsp->status_code)
942 fsp->status_code = FC_CMD_ABORTED;
945 * Test for transport underrun, independent of response
948 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
949 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
950 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
951 fsp->status_code = FC_DATA_UNDRUN;
959 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
960 struct fc_frame *conf_frame;
963 csp = lport->tt.seq_start_next(seq);
964 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
966 f_ctl = FC_FC_SEQ_INIT;
967 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
968 ep = fc_seq_exch(seq);
969 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
971 FC_TYPE_FCP, f_ctl, 0);
972 lport->tt.seq_send(lport, csp, conf_frame);
975 lport->tt.exch_done(seq);
978 * Some resets driven by SCSI are not I/Os and do not have
979 * SCSI commands associated with the requests. We should not
980 * call I/O completion if we do not have a SCSI command.
987 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
988 * @fsp: The FCP packet whose exchanges should be canceled
989 * @error: The reason for the cancellation
991 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
993 struct fc_lport *lport = fsp->lp;
996 lport->tt.exch_done(fsp->seq_ptr);
999 fsp->status_code = error;
1003 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1004 * @lport: The local port whose exchanges should be canceled
1005 * @id: The target's ID
1007 * @error: The reason for cancellation
1009 * If lun or id is -1, they are ignored.
1011 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1012 unsigned int lun, int error)
1014 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1015 struct fc_fcp_pkt *fsp;
1016 struct scsi_cmnd *sc_cmd;
1017 unsigned long flags;
1019 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1021 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1023 if (id != -1 && scmd_id(sc_cmd) != id)
1026 if (lun != -1 && sc_cmd->device->lun != lun)
1029 fc_fcp_pkt_hold(fsp);
1030 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1032 if (!fc_fcp_lock_pkt(fsp)) {
1033 fc_fcp_cleanup_cmd(fsp, error);
1035 fc_fcp_unlock_pkt(fsp);
1038 fc_fcp_pkt_release(fsp);
1039 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1041 * while we dropped the lock multiple pkts could
1042 * have been released, so we have to start over.
1046 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1050 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1051 * @lport: The local port whose exchanges are to be aborted
1053 static void fc_fcp_abort_io(struct fc_lport *lport)
1055 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1059 * fc_fcp_pkt_send() - Send a fcp_pkt
1060 * @lport: The local port to send the FCP packet on
1061 * @fsp: The FCP packet to send
1063 * Return: Zero for success and -1 for failure
1064 * Locks: Called without locks held
1066 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1068 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1069 unsigned long flags;
1072 fsp->cmd->SCp.ptr = (char *)fsp;
1073 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1074 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1076 int_to_scsilun(fsp->cmd->device->lun,
1077 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1078 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1080 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1081 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1082 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1083 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1085 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1086 fsp->cmd->SCp.ptr = NULL;
1087 list_del(&fsp->list);
1088 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1095 * get_fsp_rec_tov() - Helper function to get REC_TOV
1096 * @fsp: the FCP packet
1098 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
1100 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
1102 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
1104 return msecs_to_jiffies(rpriv->e_d_tov) + HZ;
1108 * fc_fcp_cmd_send() - Send a FCP command
1109 * @lport: The local port to send the command on
1110 * @fsp: The FCP packet the command is on
1111 * @resp: The handler for the response
1113 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1114 void (*resp)(struct fc_seq *,
1115 struct fc_frame *fp,
1118 struct fc_frame *fp;
1120 struct fc_rport *rport;
1121 struct fc_rport_libfc_priv *rpriv;
1122 const size_t len = sizeof(fsp->cdb_cmd);
1125 if (fc_fcp_lock_pkt(fsp))
1128 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1134 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1137 fsp->max_payload = rport->maxframe_size;
1138 rpriv = rport->dd_data;
1140 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1141 rpriv->local_port->port_id, FC_TYPE_FCP,
1144 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1151 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1153 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1154 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1155 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1158 fc_fcp_unlock_pkt(fsp);
1163 * fc_fcp_error() - Handler for FCP layer errors
1164 * @fsp: The FCP packet the error is on
1165 * @fp: The frame that has errored
1167 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1169 int error = PTR_ERR(fp);
1171 if (fc_fcp_lock_pkt(fsp))
1174 if (error == -FC_EX_CLOSED) {
1175 fc_fcp_retry_cmd(fsp);
1180 * clear abort pending, because the lower layer
1181 * decided to force completion.
1183 fsp->state &= ~FC_SRB_ABORT_PENDING;
1184 fsp->status_code = FC_CMD_PLOGO;
1185 fc_fcp_complete_locked(fsp);
1187 fc_fcp_unlock_pkt(fsp);
1191 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1192 * @fsp: The FCP packet to abort on
1194 * Called to send an abort and then wait for abort completion
1196 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1199 unsigned long ticks_left;
1201 if (fc_fcp_send_abort(fsp))
1204 init_completion(&fsp->tm_done);
1205 fsp->wait_for_comp = 1;
1207 spin_unlock_bh(&fsp->scsi_pkt_lock);
1208 ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1210 spin_lock_bh(&fsp->scsi_pkt_lock);
1211 fsp->wait_for_comp = 0;
1214 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1215 } else if (fsp->state & FC_SRB_ABORTED) {
1216 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1218 fc_fcp_complete_locked(fsp);
1225 * fc_lun_reset_send() - Send LUN reset command
1226 * @data: The FCP packet that identifies the LUN to be reset
1228 static void fc_lun_reset_send(unsigned long data)
1230 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1231 struct fc_lport *lport = fsp->lp;
1233 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1234 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1236 if (fc_fcp_lock_pkt(fsp))
1238 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1239 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1240 fc_fcp_unlock_pkt(fsp);
1245 * fc_lun_reset() - Send a LUN RESET command to a device
1246 * and wait for the reply
1247 * @lport: The local port to sent the command on
1248 * @fsp: The FCP packet that identifies the LUN to be reset
1249 * @id: The SCSI command ID
1250 * @lun: The LUN ID to be reset
1252 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1253 unsigned int id, unsigned int lun)
1257 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1258 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1259 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1261 fsp->wait_for_comp = 1;
1262 init_completion(&fsp->tm_done);
1264 fc_lun_reset_send((unsigned long)fsp);
1267 * wait for completion of reset
1268 * after that make sure all commands are terminated
1270 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1272 spin_lock_bh(&fsp->scsi_pkt_lock);
1273 fsp->state |= FC_SRB_COMPL;
1274 spin_unlock_bh(&fsp->scsi_pkt_lock);
1276 del_timer_sync(&fsp->timer);
1278 spin_lock_bh(&fsp->scsi_pkt_lock);
1280 lport->tt.exch_done(fsp->seq_ptr);
1281 fsp->seq_ptr = NULL;
1283 fsp->wait_for_comp = 0;
1284 spin_unlock_bh(&fsp->scsi_pkt_lock);
1287 FC_SCSI_DBG(lport, "lun reset failed\n");
1291 /* cdb_status holds the tmf's rsp code */
1292 if (fsp->cdb_status != FCP_TMF_CMPL)
1295 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1296 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1301 * fc_tm_done() - Task Management response handler
1302 * @seq: The sequence that the response is on
1303 * @fp: The response frame
1304 * @arg: The FCP packet the response is for
1306 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1308 struct fc_fcp_pkt *fsp = arg;
1309 struct fc_frame_header *fh;
1313 * If there is an error just let it timeout or wait
1314 * for TMF to be aborted if it timedout.
1316 * scsi-eh will escalate for when either happens.
1321 if (fc_fcp_lock_pkt(fsp))
1325 * raced with eh timeout handler.
1327 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1330 fh = fc_frame_header_get(fp);
1331 if (fh->fh_type != FC_TYPE_BLS)
1332 fc_fcp_resp(fsp, fp);
1333 fsp->seq_ptr = NULL;
1334 fsp->lp->tt.exch_done(seq);
1336 fc_fcp_unlock_pkt(fsp);
1342 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1343 * @lport: The local port to be cleaned up
1345 static void fc_fcp_cleanup(struct fc_lport *lport)
1347 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1351 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1352 * @data: The FCP packet that has timed out
1354 * If REC is supported then just issue it and return. The REC exchange will
1355 * complete or time out and recovery can continue at that point. Otherwise,
1356 * if the response has been received without all the data it has been
1357 * ER_TIMEOUT since the response was received. If the response has not been
1358 * received we see if data was received recently. If it has been then we
1359 * continue waiting, otherwise, we abort the command.
1361 static void fc_fcp_timeout(unsigned long data)
1363 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1364 struct fc_rport *rport = fsp->rport;
1365 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1367 if (fc_fcp_lock_pkt(fsp))
1370 if (fsp->cdb_cmd.fc_tm_flags)
1373 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1375 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1377 else if (fsp->state & FC_SRB_RCV_STATUS)
1378 fc_fcp_complete_locked(fsp);
1380 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1381 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1383 fc_fcp_unlock_pkt(fsp);
1387 * fc_fcp_rec() - Send a REC ELS request
1388 * @fsp: The FCP packet to send the REC request on
1390 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1392 struct fc_lport *lport;
1393 struct fc_frame *fp;
1394 struct fc_rport *rport;
1395 struct fc_rport_libfc_priv *rpriv;
1399 rpriv = rport->dd_data;
1400 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1401 fsp->status_code = FC_HRD_ERROR;
1403 fc_fcp_complete_locked(fsp);
1407 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1411 fr_seq(fp) = fsp->seq_ptr;
1412 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1413 rpriv->local_port->port_id, FC_TYPE_ELS,
1415 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1416 fc_fcp_rec_resp, fsp,
1417 2 * lport->r_a_tov)) {
1418 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1422 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1423 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1425 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1429 * fc_fcp_rec_resp() - Handler for REC ELS responses
1430 * @seq: The sequence the response is on
1431 * @fp: The response frame
1432 * @arg: The FCP packet the response is on
1434 * If the response is a reject then the scsi layer will handle
1435 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1436 * set the timeout and return. If the I/O was completed then complete the
1437 * exchange and tell the SCSI layer.
1439 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1441 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1442 struct fc_els_rec_acc *recp;
1443 struct fc_els_ls_rjt *rjt;
1447 enum dma_data_direction data_dir;
1449 struct fc_rport_libfc_priv *rpriv;
1452 fc_fcp_rec_error(fsp, fp);
1456 if (fc_fcp_lock_pkt(fsp))
1459 fsp->recov_retry = 0;
1460 opcode = fc_frame_payload_op(fp);
1461 if (opcode == ELS_LS_RJT) {
1462 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1463 switch (rjt->er_reason) {
1465 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1466 "reason %d expl %d\n",
1467 fsp->rport->port_id, rjt->er_reason,
1471 FC_FCP_DBG(fsp, "device does not support REC\n");
1472 rpriv = fsp->rport->dd_data;
1474 * if we do not spport RECs or got some bogus
1475 * reason then resetup timer so we check for
1478 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1483 * If no data transfer, the command frame got dropped
1484 * so we just retry. If data was transferred, we
1485 * lost the response but the target has no record,
1486 * so we abort and retry.
1488 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1489 fsp->xfer_len == 0) {
1490 fc_fcp_retry_cmd(fsp);
1493 fc_fcp_recovery(fsp, FC_ERROR);
1496 } else if (opcode == ELS_LS_ACC) {
1497 if (fsp->state & FC_SRB_ABORTED)
1500 data_dir = fsp->cmd->sc_data_direction;
1501 recp = fc_frame_payload_get(fp, sizeof(*recp));
1502 offset = ntohl(recp->reca_fc4value);
1503 e_stat = ntohl(recp->reca_e_stat);
1505 if (e_stat & ESB_ST_COMPLETE) {
1508 * The exchange is complete.
1510 * For output, we must've lost the response.
1511 * For input, all data must've been sent.
1512 * We lost may have lost the response
1513 * (and a confirmation was requested) and maybe
1516 * If all data received, send SRR
1517 * asking for response. If partial data received,
1518 * or gaps, SRR requests data at start of gap.
1519 * Recovery via SRR relies on in-order-delivery.
1521 if (data_dir == DMA_TO_DEVICE) {
1522 r_ctl = FC_RCTL_DD_CMD_STATUS;
1523 } else if (fsp->xfer_contig_end == offset) {
1524 r_ctl = FC_RCTL_DD_CMD_STATUS;
1526 offset = fsp->xfer_contig_end;
1527 r_ctl = FC_RCTL_DD_SOL_DATA;
1529 fc_fcp_srr(fsp, r_ctl, offset);
1530 } else if (e_stat & ESB_ST_SEQ_INIT) {
1532 * The remote port has the initiative, so just
1533 * keep waiting for it to complete.
1535 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1539 * The exchange is incomplete, we have seq. initiative.
1540 * Lost response with requested confirmation,
1541 * lost confirmation, lost transfer ready or
1544 * For output, if not all data was received, ask
1545 * for transfer ready to be repeated.
1547 * If we received or sent all the data, send SRR to
1550 * If we lost a response, we may have lost some read
1553 r_ctl = FC_RCTL_DD_SOL_DATA;
1554 if (data_dir == DMA_TO_DEVICE) {
1555 r_ctl = FC_RCTL_DD_CMD_STATUS;
1556 if (offset < fsp->data_len)
1557 r_ctl = FC_RCTL_DD_DATA_DESC;
1558 } else if (offset == fsp->xfer_contig_end) {
1559 r_ctl = FC_RCTL_DD_CMD_STATUS;
1560 } else if (fsp->xfer_contig_end < offset) {
1561 offset = fsp->xfer_contig_end;
1563 fc_fcp_srr(fsp, r_ctl, offset);
1567 fc_fcp_unlock_pkt(fsp);
1569 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1574 * fc_fcp_rec_error() - Handler for REC errors
1575 * @fsp: The FCP packet the error is on
1576 * @fp: The REC frame
1578 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1580 int error = PTR_ERR(fp);
1582 if (fc_fcp_lock_pkt(fsp))
1587 fc_fcp_retry_cmd(fsp);
1591 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1592 fsp, fsp->rport->port_id, error);
1593 fsp->status_code = FC_CMD_PLOGO;
1596 case -FC_EX_TIMEOUT:
1598 * Assume REC or LS_ACC was lost.
1599 * The exchange manager will have aborted REC, so retry.
1601 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
1602 fsp->rport->port_id, error, fsp->recov_retry,
1603 FC_MAX_RECOV_RETRY);
1604 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1607 fc_fcp_recovery(fsp, FC_ERROR);
1610 fc_fcp_unlock_pkt(fsp);
1612 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1616 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1617 * @fsp: The FCP pkt that needs to be aborted
1619 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1621 fsp->status_code = code;
1622 fsp->cdb_status = 0;
1625 * if this fails then we let the scsi command timer fire and
1628 fc_fcp_send_abort(fsp);
1632 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1633 * @fsp: The FCP packet the SRR is to be sent on
1634 * @r_ctl: The R_CTL field for the SRR request
1635 * This is called after receiving status but insufficient data, or
1636 * when expecting status but the request has timed out.
1638 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1640 struct fc_lport *lport = fsp->lp;
1641 struct fc_rport *rport;
1642 struct fc_rport_libfc_priv *rpriv;
1643 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1645 struct fcp_srr *srr;
1646 struct fc_frame *fp;
1647 unsigned int rec_tov;
1650 rpriv = rport->dd_data;
1652 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1653 rpriv->rp_state != RPORT_ST_READY)
1654 goto retry; /* shouldn't happen */
1655 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1659 srr = fc_frame_payload_get(fp, sizeof(*srr));
1660 memset(srr, 0, sizeof(*srr));
1661 srr->srr_op = ELS_SRR;
1662 srr->srr_ox_id = htons(ep->oxid);
1663 srr->srr_rx_id = htons(ep->rxid);
1664 srr->srr_r_ctl = r_ctl;
1665 srr->srr_rel_off = htonl(offset);
1667 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1668 rpriv->local_port->port_id, FC_TYPE_FCP,
1671 rec_tov = get_fsp_rec_tov(fsp);
1672 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp,
1674 fsp, jiffies_to_msecs(rec_tov));
1678 fsp->recov_seq = seq;
1679 fsp->xfer_len = offset;
1680 fsp->xfer_contig_end = offset;
1681 fsp->state &= ~FC_SRB_RCV_STATUS;
1682 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1685 fc_fcp_retry_cmd(fsp);
1689 * fc_fcp_srr_resp() - Handler for SRR response
1690 * @seq: The sequence the SRR is on
1691 * @fp: The SRR frame
1692 * @arg: The FCP packet the SRR is on
1694 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1696 struct fc_fcp_pkt *fsp = arg;
1697 struct fc_frame_header *fh;
1700 fc_fcp_srr_error(fsp, fp);
1704 if (fc_fcp_lock_pkt(fsp))
1707 fh = fc_frame_header_get(fp);
1709 * BUG? fc_fcp_srr_error calls exch_done which would release
1710 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1711 * then fc_exch_timeout would be sending an abort. The exch_done
1712 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1713 * an abort response though.
1715 if (fh->fh_type == FC_TYPE_BLS) {
1716 fc_fcp_unlock_pkt(fsp);
1720 switch (fc_frame_payload_op(fp)) {
1722 fsp->recov_retry = 0;
1723 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1727 fc_fcp_recovery(fsp, FC_ERROR);
1730 fc_fcp_unlock_pkt(fsp);
1732 fsp->lp->tt.exch_done(seq);
1737 * fc_fcp_srr_error() - Handler for SRR errors
1738 * @fsp: The FCP packet that the SRR error is on
1739 * @fp: The SRR frame
1741 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1743 if (fc_fcp_lock_pkt(fsp))
1745 switch (PTR_ERR(fp)) {
1746 case -FC_EX_TIMEOUT:
1747 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1750 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1752 case -FC_EX_CLOSED: /* e.g., link failure */
1755 fc_fcp_retry_cmd(fsp);
1758 fc_fcp_unlock_pkt(fsp);
1760 fsp->lp->tt.exch_done(fsp->recov_seq);
1764 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1765 * @lport: The local port to be checked
1767 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1770 return (lport->state == LPORT_ST_READY) &&
1771 lport->link_up && !lport->qfull;
1775 * fc_queuecommand() - The queuecommand function of the SCSI template
1776 * @shost: The Scsi_Host that the command was issued to
1777 * @cmd: The scsi_cmnd to be executed
1779 * This is the i/o strategy routine, called by the SCSI layer.
1781 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1783 struct fc_lport *lport = shost_priv(shost);
1784 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1785 struct fc_fcp_pkt *fsp;
1786 struct fc_rport_libfc_priv *rpriv;
1789 struct fcoe_dev_stats *stats;
1791 rval = fc_remote_port_chkready(rport);
1793 sc_cmd->result = rval;
1794 sc_cmd->scsi_done(sc_cmd);
1798 if (!*(struct fc_remote_port **)rport->dd_data) {
1800 * rport is transitioning from blocked/deleted to
1803 sc_cmd->result = DID_IMM_RETRY << 16;
1804 sc_cmd->scsi_done(sc_cmd);
1808 rpriv = rport->dd_data;
1810 if (!fc_fcp_lport_queue_ready(lport)) {
1812 fc_fcp_can_queue_ramp_down(lport);
1813 rc = SCSI_MLQUEUE_HOST_BUSY;
1817 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1819 rc = SCSI_MLQUEUE_HOST_BUSY;
1824 * build the libfc request pkt
1826 fsp->cmd = sc_cmd; /* save the cmd */
1827 fsp->rport = rport; /* set the remote port ptr */
1830 * set up the transfer length
1832 fsp->data_len = scsi_bufflen(sc_cmd);
1836 * setup the data direction
1838 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1839 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1840 fsp->req_flags = FC_SRB_READ;
1841 stats->InputRequests++;
1842 stats->InputBytes += fsp->data_len;
1843 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1844 fsp->req_flags = FC_SRB_WRITE;
1845 stats->OutputRequests++;
1846 stats->OutputBytes += fsp->data_len;
1849 stats->ControlRequests++;
1853 init_timer(&fsp->timer);
1854 fsp->timer.data = (unsigned long)fsp;
1857 * send it to the lower layer
1858 * if we get -1 return then put the request in the pending
1861 rval = fc_fcp_pkt_send(lport, fsp);
1863 fsp->state = FC_SRB_FREE;
1864 fc_fcp_pkt_release(fsp);
1865 rc = SCSI_MLQUEUE_HOST_BUSY;
1870 EXPORT_SYMBOL(fc_queuecommand);
1873 * fc_io_compl() - Handle responses for completed commands
1874 * @fsp: The FCP packet that is complete
1876 * Translates fcp_pkt errors to a Linux SCSI errors.
1877 * The fcp packet lock must be held when calling.
1879 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1881 struct fc_fcp_internal *si;
1882 struct scsi_cmnd *sc_cmd;
1883 struct fc_lport *lport;
1884 unsigned long flags;
1886 /* release outstanding ddp context */
1887 fc_fcp_ddp_done(fsp);
1889 fsp->state |= FC_SRB_COMPL;
1890 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1891 spin_unlock_bh(&fsp->scsi_pkt_lock);
1892 del_timer_sync(&fsp->timer);
1893 spin_lock_bh(&fsp->scsi_pkt_lock);
1897 si = fc_get_scsi_internal(lport);
1900 * if can_queue ramp down is done then try can_queue ramp up
1901 * since commands are completing now.
1903 if (si->last_can_queue_ramp_down_time)
1904 fc_fcp_can_queue_ramp_up(lport);
1907 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1908 switch (fsp->status_code) {
1910 if (fsp->cdb_status == 0) {
1914 sc_cmd->result = DID_OK << 16;
1915 if (fsp->scsi_resid)
1916 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1919 * transport level I/O was ok but scsi
1920 * has non zero status
1922 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1926 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1927 "due to FC_ERROR\n");
1928 sc_cmd->result = DID_ERROR << 16;
1930 case FC_DATA_UNDRUN:
1931 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1933 * scsi status is good but transport level
1936 if (fsp->state & FC_SRB_RCV_STATUS) {
1937 sc_cmd->result = DID_OK << 16;
1939 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
1940 " due to FC_DATA_UNDRUN (trans)\n");
1941 sc_cmd->result = DID_ERROR << 16;
1945 * scsi got underrun, this is an error
1947 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1948 "due to FC_DATA_UNDRUN (scsi)\n");
1949 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1950 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1953 case FC_DATA_OVRRUN:
1955 * overrun is an error
1957 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1958 "due to FC_DATA_OVRRUN\n");
1959 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1961 case FC_CMD_ABORTED:
1962 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1963 "due to FC_CMD_ABORTED\n");
1964 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1967 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
1968 "due to FC_CMD_RESET\n");
1969 sc_cmd->result = (DID_RESET << 16);
1972 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
1973 "due to FC_HRD_ERROR\n");
1974 sc_cmd->result = (DID_NO_CONNECT << 16);
1977 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
1978 "due to FC_CRC_ERROR\n");
1979 sc_cmd->result = (DID_PARITY << 16);
1982 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
1983 "due to FC_TIMED_OUT\n");
1984 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1987 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1988 "due to unknown error\n");
1989 sc_cmd->result = (DID_ERROR << 16);
1993 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
1994 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
1996 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1997 list_del(&fsp->list);
1998 sc_cmd->SCp.ptr = NULL;
1999 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2000 sc_cmd->scsi_done(sc_cmd);
2002 /* release ref from initial allocation in queue command */
2003 fc_fcp_pkt_release(fsp);
2007 * fc_eh_abort() - Abort a command
2008 * @sc_cmd: The SCSI command to abort
2010 * From SCSI host template.
2011 * Send an ABTS to the target device and wait for the response.
2013 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2015 struct fc_fcp_pkt *fsp;
2016 struct fc_lport *lport;
2017 struct fc_fcp_internal *si;
2019 unsigned long flags;
2021 lport = shost_priv(sc_cmd->device->host);
2022 if (lport->state != LPORT_ST_READY)
2024 else if (!lport->link_up)
2027 si = fc_get_scsi_internal(lport);
2028 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2029 fsp = CMD_SP(sc_cmd);
2031 /* command completed while scsi eh was setting up */
2032 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2035 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2036 fc_fcp_pkt_hold(fsp);
2037 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2039 if (fc_fcp_lock_pkt(fsp)) {
2040 /* completed while we were waiting for timer to be deleted */
2045 rc = fc_fcp_pkt_abort(fsp);
2046 fc_fcp_unlock_pkt(fsp);
2049 fc_fcp_pkt_release(fsp);
2052 EXPORT_SYMBOL(fc_eh_abort);
2055 * fc_eh_device_reset() - Reset a single LUN
2056 * @sc_cmd: The SCSI command which identifies the device whose
2057 * LUN is to be reset
2059 * Set from SCSI host template.
2061 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2063 struct fc_lport *lport;
2064 struct fc_fcp_pkt *fsp;
2065 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2069 rval = fc_remote_port_chkready(rport);
2073 lport = shost_priv(sc_cmd->device->host);
2075 if (lport->state != LPORT_ST_READY)
2078 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2080 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2082 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2087 * Build the libfc request pkt. Do not set the scsi cmnd, because
2088 * the sc passed in is not setup for execution like when sent
2089 * through the queuecommand callout.
2091 fsp->rport = rport; /* set the remote port ptr */
2094 * flush outstanding commands
2096 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2097 fsp->state = FC_SRB_FREE;
2098 fc_fcp_pkt_release(fsp);
2103 EXPORT_SYMBOL(fc_eh_device_reset);
2106 * fc_eh_host_reset() - Reset a Scsi_Host.
2107 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2109 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2111 struct Scsi_Host *shost = sc_cmd->device->host;
2112 struct fc_lport *lport = shost_priv(shost);
2113 unsigned long wait_tmo;
2115 FC_SCSI_DBG(lport, "Resetting host\n");
2117 lport->tt.lport_reset(lport);
2118 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2119 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2123 if (fc_fcp_lport_queue_ready(lport)) {
2124 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2125 "on port (%6.6x)\n", lport->port_id);
2128 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2129 "port (%6.6x) is not ready.\n",
2134 EXPORT_SYMBOL(fc_eh_host_reset);
2137 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2138 * @sdev: The SCSI device that identifies the SCSI host
2140 * Configures queue depth based on host's cmd_per_len. If not set
2141 * then we use the libfc default.
2143 int fc_slave_alloc(struct scsi_device *sdev)
2145 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2147 if (!rport || fc_remote_port_chkready(rport))
2150 if (sdev->tagged_supported)
2151 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2153 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2154 FC_FCP_DFLT_QUEUE_DEPTH);
2158 EXPORT_SYMBOL(fc_slave_alloc);
2161 * fc_change_queue_depth() - Change a device's queue depth
2162 * @sdev: The SCSI device whose queue depth is to change
2163 * @qdepth: The new queue depth
2164 * @reason: The resason for the change
2166 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2169 case SCSI_QDEPTH_DEFAULT:
2170 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2172 case SCSI_QDEPTH_QFULL:
2173 scsi_track_queue_full(sdev, qdepth);
2175 case SCSI_QDEPTH_RAMP_UP:
2176 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2181 return sdev->queue_depth;
2183 EXPORT_SYMBOL(fc_change_queue_depth);
2186 * fc_change_queue_type() - Change a device's queue type
2187 * @sdev: The SCSI device whose queue depth is to change
2188 * @tag_type: Identifier for queue type
2190 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2192 if (sdev->tagged_supported) {
2193 scsi_set_tag_type(sdev, tag_type);
2195 scsi_activate_tcq(sdev, sdev->queue_depth);
2197 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2203 EXPORT_SYMBOL(fc_change_queue_type);
2206 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2207 * @lport: The local port that no longer needs the FCP layer
2209 void fc_fcp_destroy(struct fc_lport *lport)
2211 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2213 if (!list_empty(&si->scsi_pkt_queue))
2214 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2215 "port (%6.6x)\n", lport->port_id);
2217 mempool_destroy(si->scsi_pkt_pool);
2219 lport->scsi_priv = NULL;
2221 EXPORT_SYMBOL(fc_fcp_destroy);
2223 int fc_setup_fcp(void)
2227 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2228 sizeof(struct fc_fcp_pkt),
2229 0, SLAB_HWCACHE_ALIGN, NULL);
2230 if (!scsi_pkt_cachep) {
2231 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2232 "module load failed!");
2239 void fc_destroy_fcp(void)
2241 if (scsi_pkt_cachep)
2242 kmem_cache_destroy(scsi_pkt_cachep);
2246 * fc_fcp_init() - Initialize the FCP layer for a local port
2247 * @lport: The local port to initialize the exchange layer for
2249 int fc_fcp_init(struct fc_lport *lport)
2252 struct fc_fcp_internal *si;
2254 if (!lport->tt.fcp_cmd_send)
2255 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2257 if (!lport->tt.fcp_cleanup)
2258 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2260 if (!lport->tt.fcp_abort_io)
2261 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2263 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2266 lport->scsi_priv = si;
2267 si->max_can_queue = lport->host->can_queue;
2268 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2269 spin_lock_init(&si->scsi_queue_lock);
2271 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2272 if (!si->scsi_pkt_pool) {
2282 EXPORT_SYMBOL(fc_fcp_init);