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)
60 /* constant added to e_d_tov timeout to get rec_tov value */
61 #define REC_TOV_CONST 1
64 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
66 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
67 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
68 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
69 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
70 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
73 * struct fc_fcp_internal - FCP layer internal data
74 * @scsi_pkt_pool: Memory pool to draw FCP packets from
75 * @scsi_queue_lock: Protects the scsi_pkt_queue
76 * @scsi_pkt_queue: Current FCP packets
77 * @last_can_queue_ramp_down_time: ramp down time
78 * @last_can_queue_ramp_up_time: ramp up time
79 * @max_can_queue: max can_queue size
81 struct fc_fcp_internal {
82 mempool_t *scsi_pkt_pool;
83 spinlock_t scsi_queue_lock;
84 struct list_head scsi_pkt_queue;
85 unsigned long last_can_queue_ramp_down_time;
86 unsigned long last_can_queue_ramp_up_time;
90 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
94 * FC scsi I/O related functions
96 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
97 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
98 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
99 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
100 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
101 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
102 static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
103 static void fc_fcp_timeout(unsigned long);
104 static void fc_fcp_rec(struct fc_fcp_pkt *);
105 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
106 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
107 static void fc_io_compl(struct fc_fcp_pkt *);
109 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
110 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
111 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
114 * command status codes
116 #define FC_COMPLETE 0
117 #define FC_CMD_ABORTED 1
118 #define FC_CMD_RESET 2
119 #define FC_CMD_PLOGO 3
121 #define FC_TRANS_ERR 5
122 #define FC_DATA_OVRRUN 6
123 #define FC_DATA_UNDRUN 7
125 #define FC_HRD_ERROR 9
126 #define FC_CRC_ERROR 10
127 #define FC_TIMED_OUT 11
130 * Error recovery timeout values.
132 #define FC_SCSI_TM_TOV (10 * HZ)
133 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
134 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
136 #define FC_MAX_ERROR_CNT 5
137 #define FC_MAX_RECOV_RETRY 3
139 #define FC_FCP_DFLT_QUEUE_DEPTH 32
142 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
143 * @lport: The local port that the FCP packet is for
144 * @gfp: GFP flags for allocation
146 * Return value: fcp_pkt structure or null on allocation failure.
147 * Context: Can be called from process context, no lock is required.
149 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
151 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
152 struct fc_fcp_pkt *fsp;
154 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
156 memset(fsp, 0, sizeof(*fsp));
158 fsp->xfer_ddp = FC_XID_UNKNOWN;
159 atomic_set(&fsp->ref_cnt, 1);
160 init_timer(&fsp->timer);
161 INIT_LIST_HEAD(&fsp->list);
162 spin_lock_init(&fsp->scsi_pkt_lock);
168 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
169 * @fsp: The FCP packet to be released
171 * Context: Can be called from process or interrupt context,
172 * no lock is required.
174 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
176 if (atomic_dec_and_test(&fsp->ref_cnt)) {
177 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
179 mempool_free(fsp, si->scsi_pkt_pool);
184 * fc_fcp_pkt_hold() - Hold a fcp_pkt
185 * @fsp: The FCP packet to be held
187 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
189 atomic_inc(&fsp->ref_cnt);
193 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
194 * @seq: The sequence that the FCP packet is on (required by destructor API)
195 * @fsp: The FCP packet to be released
197 * This routine is called by a destructor callback in the exch_seq_send()
198 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
199 * argument even though it is not used by this routine.
201 * Context: No locking required.
203 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
205 fc_fcp_pkt_release(fsp);
209 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
210 * @fsp: The FCP packet to be locked and incremented
212 * We should only return error if we return a command to SCSI-ml before
213 * getting a response. This can happen in cases where we send a abort, but
214 * do not wait for the response and the abort and command can be passing
215 * each other on the wire/network-layer.
217 * Note: this function locks the packet and gets a reference to allow
218 * callers to call the completion function while the lock is held and
219 * not have to worry about the packets refcount.
221 * TODO: Maybe we should just have callers grab/release the lock and
222 * have a function that they call to verify the fsp and grab a ref if
225 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
227 spin_lock_bh(&fsp->scsi_pkt_lock);
228 if (fsp->state & FC_SRB_COMPL) {
229 spin_unlock_bh(&fsp->scsi_pkt_lock);
233 fc_fcp_pkt_hold(fsp);
238 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
240 * @fsp: The FCP packet to be unlocked and decremented
242 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
244 spin_unlock_bh(&fsp->scsi_pkt_lock);
245 fc_fcp_pkt_release(fsp);
249 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
250 * @fsp: The FCP packet to start a timer for
251 * @delay: The timeout period for the timer
253 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
255 if (!(fsp->state & FC_SRB_COMPL))
256 mod_timer(&fsp->timer, jiffies + delay);
260 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
262 * @fsp: The FCP packet to abort exchanges on
264 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
269 fsp->state |= FC_SRB_ABORT_PENDING;
270 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
274 * fc_fcp_retry_cmd() - Retry a fcp_pkt
275 * @fsp: The FCP packet to be retried
277 * Sets the status code to be FC_ERROR and then calls
278 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
279 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
280 * The SCSI-ml will retry the command.
282 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
285 fsp->lp->tt.exch_done(fsp->seq_ptr);
289 fsp->state &= ~FC_SRB_ABORT_PENDING;
291 fsp->status_code = FC_ERROR;
292 fc_fcp_complete_locked(fsp);
296 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
297 * @fsp: The FCP packet that will manage the DDP frames
298 * @xid: The XID that will be used for the DDP exchange
300 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
302 struct fc_lport *lport;
305 if ((fsp->req_flags & FC_SRB_READ) &&
306 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
307 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
308 scsi_sg_count(fsp->cmd)))
314 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
315 * DDP related resources for a fcp_pkt
316 * @fsp: The FCP packet that DDP had been used on
318 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
320 struct fc_lport *lport;
325 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
329 if (lport->tt.ddp_done) {
330 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
331 fsp->xfer_ddp = FC_XID_UNKNOWN;
336 * fc_fcp_can_queue_ramp_up() - increases can_queue
337 * @lport: lport to ramp up can_queue
339 * Locking notes: Called with Scsi_Host lock held
341 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
343 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
346 if (si->last_can_queue_ramp_up_time &&
347 (time_before(jiffies, si->last_can_queue_ramp_up_time +
348 FC_CAN_QUEUE_PERIOD)))
351 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
352 FC_CAN_QUEUE_PERIOD))
355 si->last_can_queue_ramp_up_time = jiffies;
357 can_queue = lport->host->can_queue << 1;
358 if (can_queue >= si->max_can_queue) {
359 can_queue = si->max_can_queue;
360 si->last_can_queue_ramp_down_time = 0;
362 lport->host->can_queue = can_queue;
363 shost_printk(KERN_ERR, lport->host, "libfc: increased "
364 "can_queue to %d.\n", can_queue);
368 * fc_fcp_can_queue_ramp_down() - reduces can_queue
369 * @lport: lport to reduce can_queue
371 * If we are getting memory allocation failures, then we may
372 * be trying to execute too many commands. We let the running
373 * commands complete or timeout, then try again with a reduced
374 * can_queue. Eventually we will hit the point where we run
375 * on all reserved structs.
377 * Locking notes: Called with Scsi_Host lock held
379 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
381 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
384 if (si->last_can_queue_ramp_down_time &&
385 (time_before(jiffies, si->last_can_queue_ramp_down_time +
386 FC_CAN_QUEUE_PERIOD)))
389 si->last_can_queue_ramp_down_time = jiffies;
391 can_queue = lport->host->can_queue;
395 lport->host->can_queue = can_queue;
396 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
397 "Reducing can_queue to %d.\n", can_queue);
401 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
402 * @lport: fc lport struct
403 * @len: payload length
405 * Allocates fc_frame structure and buffer but if fails to allocate
406 * then reduce can_queue.
408 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
414 fp = fc_frame_alloc(lport, len);
419 spin_lock_irqsave(lport->host->host_lock, flags);
420 fc_fcp_can_queue_ramp_down(lport);
421 spin_unlock_irqrestore(lport->host->host_lock, flags);
426 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
427 * @fsp: The FCP packet the data is on
428 * @fp: The data frame
430 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
432 struct scsi_cmnd *sc = fsp->cmd;
433 struct fc_lport *lport = fsp->lp;
434 struct fcoe_dev_stats *stats;
435 struct fc_frame_header *fh;
442 struct scatterlist *sg;
444 u8 host_bcode = FC_COMPLETE;
446 fh = fc_frame_header_get(fp);
447 offset = ntohl(fh->fh_parm_offset);
448 start_offset = offset;
449 len = fr_len(fp) - sizeof(*fh);
450 buf = fc_frame_payload_get(fp, 0);
453 * if this I/O is ddped then clear it and initiate recovery since data
454 * frames are expected to be placed directly in that case.
456 * Indicate error to scsi-ml because something went wrong with the
457 * ddp handling to get us here.
459 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
460 fc_fcp_ddp_done(fsp);
461 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
462 host_bcode = FC_ERROR;
465 if (offset + len > fsp->data_len) {
466 /* this should never happen */
467 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
468 fc_frame_crc_check(fp))
470 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
471 "data_len %x\n", len, offset, fsp->data_len);
473 /* Data is corrupted indicate scsi-ml should retry */
474 host_bcode = FC_DATA_OVRRUN;
477 if (offset != fsp->xfer_len)
478 fsp->state |= FC_SRB_DISCONTIG;
480 sg = scsi_sglist(sc);
481 nents = scsi_sg_count(sc);
483 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
484 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
485 &offset, KM_SOFTIRQ0, NULL);
487 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
488 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
489 &offset, KM_SOFTIRQ0, &crc);
490 buf = fc_frame_payload_get(fp, 0);
492 crc = crc32(crc, buf + len, 4 - (len % 4));
494 if (~crc != le32_to_cpu(fr_crc(fp))) {
496 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
497 stats->ErrorFrames++;
498 /* per cpu count, not total count, but OK for limit */
499 if (stats->InvalidCRCCount++ < 5)
500 printk(KERN_WARNING "libfc: CRC error on data "
501 "frame for port (%6.6x)\n",
505 * Assume the frame is total garbage.
506 * We may have copied it over the good part
508 * If so, we need to retry the entire operation.
509 * Otherwise, ignore it.
511 if (fsp->state & FC_SRB_DISCONTIG) {
512 host_bcode = FC_CRC_ERROR;
519 if (fsp->xfer_contig_end == start_offset)
520 fsp->xfer_contig_end += copy_len;
521 fsp->xfer_len += copy_len;
524 * In the very rare event that this data arrived after the response
525 * and completes the transfer, call the completion handler.
527 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
528 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
529 fc_fcp_complete_locked(fsp);
532 fc_fcp_recovery(fsp, host_bcode);
536 * fc_fcp_send_data() - Send SCSI data to a target
537 * @fsp: The FCP packet the data is on
538 * @sp: The sequence the data is to be sent on
539 * @offset: The starting offset for this data request
540 * @seq_blen: The burst length for this data request
542 * Called after receiving a Transfer Ready data descriptor.
543 * If the LLD is capable of sequence offload then send down the
544 * seq_blen amount of data in single frame, otherwise send
545 * multiple frames of the maximum frame payload supported by
548 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
549 size_t offset, size_t seq_blen)
552 struct scsi_cmnd *sc;
553 struct scatterlist *sg;
554 struct fc_frame *fp = NULL;
555 struct fc_lport *lport = fsp->lp;
561 size_t frame_offset, fh_parm_offset;
566 int using_sg = lport->sg_supp;
569 WARN_ON(seq_blen <= 0);
570 if (unlikely(offset + seq_blen > fsp->data_len)) {
571 /* this should never happen */
572 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
573 "offset %zx\n", seq_blen, offset);
574 fc_fcp_send_abort(fsp);
576 } else if (offset != fsp->xfer_len) {
577 /* Out of Order Data Request - no problem, but unexpected. */
578 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
579 "seq_blen %zx offset %zx\n", seq_blen, offset);
583 * if LLD is capable of seq_offload then set transport
584 * burst length (t_blen) to seq_blen, otherwise set t_blen
585 * to max FC frame payload previously set in fsp->max_payload.
587 t_blen = fsp->max_payload;
588 if (lport->seq_offload) {
589 t_blen = min(seq_blen, (size_t)lport->lso_max);
590 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
591 fsp, seq_blen, lport->lso_max, t_blen);
595 t_blen &= ~(512 - 1); /* round down to block size */
598 remaining = seq_blen;
599 fh_parm_offset = frame_offset = offset;
601 seq = lport->tt.seq_start_next(seq);
602 f_ctl = FC_FC_REL_OFF;
605 sg = scsi_sglist(sc);
607 while (remaining > 0 && sg) {
608 if (offset >= sg->length) {
609 offset -= sg->length;
614 tlen = min(t_blen, remaining);
617 * TODO. Temporary workaround. fc_seq_send() can't
618 * handle odd lengths in non-linear skbs.
619 * This will be the final fragment only.
623 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
627 data = fc_frame_header_get(fp) + 1;
628 fh_parm_offset = frame_offset;
629 fr_max_payload(fp) = fsp->max_payload;
632 off = offset + sg->offset;
633 sg_bytes = min(tlen, sg->length - offset);
634 sg_bytes = min(sg_bytes,
635 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
636 page = sg_page(sg) + (off >> PAGE_SHIFT);
639 skb_fill_page_desc(fp_skb(fp),
640 skb_shinfo(fp_skb(fp))->nr_frags,
641 page, off & ~PAGE_MASK, sg_bytes);
642 fp_skb(fp)->data_len += sg_bytes;
643 fr_len(fp) += sg_bytes;
644 fp_skb(fp)->truesize += PAGE_SIZE;
647 * The scatterlist item may be bigger than PAGE_SIZE,
648 * but we must not cross pages inside the kmap.
650 page_addr = kmap_atomic(page, KM_SOFTIRQ0);
651 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
653 kunmap_atomic(page_addr, KM_SOFTIRQ0);
657 frame_offset += sg_bytes;
659 remaining -= sg_bytes;
661 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
666 * Send sequence with transfer sequence initiative in case
667 * this is last FCP frame of the sequence.
670 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
672 ep = fc_seq_exch(seq);
673 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
674 FC_TYPE_FCP, f_ctl, fh_parm_offset);
677 * send fragment using for a sequence.
679 error = lport->tt.seq_send(lport, seq, fp);
681 WARN_ON(1); /* send error should be rare */
682 fc_fcp_retry_cmd(fsp);
687 fsp->xfer_len += seq_blen; /* premature count? */
692 * fc_fcp_abts_resp() - Send an ABTS response
693 * @fsp: The FCP packet that is being aborted
694 * @fp: The response frame
696 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
699 struct fc_ba_rjt *brp;
700 struct fc_frame_header *fh;
702 fh = fc_frame_header_get(fp);
703 switch (fh->fh_r_ctl) {
707 brp = fc_frame_payload_get(fp, sizeof(*brp));
708 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
713 * we will let the command timeout
714 * and scsi-ml recover in this case,
715 * therefore cleared the ba_done flag.
721 fsp->state |= FC_SRB_ABORTED;
722 fsp->state &= ~FC_SRB_ABORT_PENDING;
724 if (fsp->wait_for_comp)
725 complete(&fsp->tm_done);
727 fc_fcp_complete_locked(fsp);
732 * fc_fcp_recv() - Reveive an FCP frame
733 * @seq: The sequence the frame is on
734 * @fp: The received frame
735 * @arg: The related FCP packet
737 * Context: Called from Soft IRQ context. Can not be called
738 * holding the FCP packet list lock.
740 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
742 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
743 struct fc_lport *lport = fsp->lp;
744 struct fc_frame_header *fh;
745 struct fcp_txrdy *dd;
750 fc_fcp_error(fsp, fp);
754 fh = fc_frame_header_get(fp);
755 r_ctl = fh->fh_r_ctl;
757 if (lport->state != LPORT_ST_READY)
759 if (fc_fcp_lock_pkt(fsp))
761 fsp->last_pkt_time = jiffies;
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 transfered 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 list_del(&fsp->list);
1087 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1094 * get_fsp_rec_tov() - Helper function to get REC_TOV
1095 * @fsp: the FCP packet
1097 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
1099 struct fc_rport *rport;
1100 struct fc_rport_libfc_priv *rpriv;
1103 rpriv = rport->dd_data;
1105 return rpriv->e_d_tov + REC_TOV_CONST;
1109 * fc_fcp_cmd_send() - Send a FCP command
1110 * @lport: The local port to send the command on
1111 * @fsp: The FCP packet the command is on
1112 * @resp: The handler for the response
1114 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1115 void (*resp)(struct fc_seq *,
1116 struct fc_frame *fp,
1119 struct fc_frame *fp;
1121 struct fc_rport *rport;
1122 struct fc_rport_libfc_priv *rpriv;
1123 const size_t len = sizeof(fsp->cdb_cmd);
1125 unsigned int rec_tov;
1127 if (fc_fcp_lock_pkt(fsp))
1130 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1136 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1139 fsp->max_payload = rport->maxframe_size;
1140 rpriv = rport->dd_data;
1142 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1143 rpriv->local_port->port_id, FC_TYPE_FCP,
1146 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1152 fsp->last_pkt_time = jiffies;
1154 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1156 rec_tov = get_fsp_rec_tov(fsp);
1158 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1160 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1161 fc_fcp_timer_set(fsp, rec_tov);
1164 fc_fcp_unlock_pkt(fsp);
1169 * fc_fcp_error() - Handler for FCP layer errors
1170 * @fsp: The FCP packet the error is on
1171 * @fp: The frame that has errored
1173 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1175 int error = PTR_ERR(fp);
1177 if (fc_fcp_lock_pkt(fsp))
1180 if (error == -FC_EX_CLOSED) {
1181 fc_fcp_retry_cmd(fsp);
1186 * clear abort pending, because the lower layer
1187 * decided to force completion.
1189 fsp->state &= ~FC_SRB_ABORT_PENDING;
1190 fsp->status_code = FC_CMD_PLOGO;
1191 fc_fcp_complete_locked(fsp);
1193 fc_fcp_unlock_pkt(fsp);
1197 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1198 * @fsp: The FCP packet to abort on
1200 * Called to send an abort and then wait for abort completion
1202 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1206 if (fc_fcp_send_abort(fsp))
1209 init_completion(&fsp->tm_done);
1210 fsp->wait_for_comp = 1;
1212 spin_unlock_bh(&fsp->scsi_pkt_lock);
1213 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1214 spin_lock_bh(&fsp->scsi_pkt_lock);
1215 fsp->wait_for_comp = 0;
1218 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1220 } else if (fsp->state & FC_SRB_ABORTED) {
1221 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1223 fc_fcp_complete_locked(fsp);
1230 * fc_lun_reset_send() - Send LUN reset command
1231 * @data: The FCP packet that identifies the LUN to be reset
1233 static void fc_lun_reset_send(unsigned long data)
1235 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1236 struct fc_lport *lport = fsp->lp;
1237 unsigned int rec_tov;
1239 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1240 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1242 if (fc_fcp_lock_pkt(fsp))
1244 rec_tov = get_fsp_rec_tov(fsp);
1245 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1246 fc_fcp_timer_set(fsp, rec_tov);
1247 fc_fcp_unlock_pkt(fsp);
1252 * fc_lun_reset() - Send a LUN RESET command to a device
1253 * and wait for the reply
1254 * @lport: The local port to sent the command on
1255 * @fsp: The FCP packet that identifies the LUN to be reset
1256 * @id: The SCSI command ID
1257 * @lun: The LUN ID to be reset
1259 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1260 unsigned int id, unsigned int lun)
1264 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1265 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1266 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1268 fsp->wait_for_comp = 1;
1269 init_completion(&fsp->tm_done);
1271 fc_lun_reset_send((unsigned long)fsp);
1274 * wait for completion of reset
1275 * after that make sure all commands are terminated
1277 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1279 spin_lock_bh(&fsp->scsi_pkt_lock);
1280 fsp->state |= FC_SRB_COMPL;
1281 spin_unlock_bh(&fsp->scsi_pkt_lock);
1283 del_timer_sync(&fsp->timer);
1285 spin_lock_bh(&fsp->scsi_pkt_lock);
1287 lport->tt.exch_done(fsp->seq_ptr);
1288 fsp->seq_ptr = NULL;
1290 fsp->wait_for_comp = 0;
1291 spin_unlock_bh(&fsp->scsi_pkt_lock);
1294 FC_SCSI_DBG(lport, "lun reset failed\n");
1298 /* cdb_status holds the tmf's rsp code */
1299 if (fsp->cdb_status != FCP_TMF_CMPL)
1302 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1303 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1308 * fc_tm_done() - Task Managment response handler
1309 * @seq: The sequence that the response is on
1310 * @fp: The response frame
1311 * @arg: The FCP packet the response is for
1313 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1315 struct fc_fcp_pkt *fsp = arg;
1316 struct fc_frame_header *fh;
1320 * If there is an error just let it timeout or wait
1321 * for TMF to be aborted if it timedout.
1323 * scsi-eh will escalate for when either happens.
1328 if (fc_fcp_lock_pkt(fsp))
1332 * raced with eh timeout handler.
1334 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1337 fh = fc_frame_header_get(fp);
1338 if (fh->fh_type != FC_TYPE_BLS)
1339 fc_fcp_resp(fsp, fp);
1340 fsp->seq_ptr = NULL;
1341 fsp->lp->tt.exch_done(seq);
1343 fc_fcp_unlock_pkt(fsp);
1349 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1350 * @lport: The local port to be cleaned up
1352 static void fc_fcp_cleanup(struct fc_lport *lport)
1354 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1358 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1359 * @data: The FCP packet that has timed out
1361 * If REC is supported then just issue it and return. The REC exchange will
1362 * complete or time out and recovery can continue at that point. Otherwise,
1363 * if the response has been received without all the data it has been
1364 * ER_TIMEOUT since the response was received. If the response has not been
1365 * received we see if data was received recently. If it has been then we
1366 * continue waiting, otherwise, we abort the command.
1368 static void fc_fcp_timeout(unsigned long data)
1370 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1371 struct fc_rport *rport = fsp->rport;
1372 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1374 if (fc_fcp_lock_pkt(fsp))
1377 if (fsp->cdb_cmd.fc_tm_flags)
1380 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1382 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1384 else if (fsp->state & FC_SRB_RCV_STATUS)
1385 fc_fcp_complete_locked(fsp);
1387 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1388 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1390 fc_fcp_unlock_pkt(fsp);
1394 * fc_fcp_rec() - Send a REC ELS request
1395 * @fsp: The FCP packet to send the REC request on
1397 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1399 struct fc_lport *lport;
1400 struct fc_frame *fp;
1401 struct fc_rport *rport;
1402 struct fc_rport_libfc_priv *rpriv;
1406 rpriv = rport->dd_data;
1407 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1408 fsp->status_code = FC_HRD_ERROR;
1410 fc_fcp_complete_locked(fsp);
1414 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1418 fr_seq(fp) = fsp->seq_ptr;
1419 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1420 rpriv->local_port->port_id, FC_TYPE_ELS,
1422 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1423 fc_fcp_rec_resp, fsp,
1424 2 * lport->r_a_tov)) {
1425 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1429 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1430 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1432 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1436 * fc_fcp_rec_resp() - Handler for REC ELS responses
1437 * @seq: The sequence the response is on
1438 * @fp: The response frame
1439 * @arg: The FCP packet the response is on
1441 * If the response is a reject then the scsi layer will handle
1442 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1443 * set the timeout and return. If the I/O was completed then complete the
1444 * exchange and tell the SCSI layer.
1446 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1448 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1449 struct fc_els_rec_acc *recp;
1450 struct fc_els_ls_rjt *rjt;
1454 enum dma_data_direction data_dir;
1456 struct fc_rport_libfc_priv *rpriv;
1459 fc_fcp_rec_error(fsp, fp);
1463 if (fc_fcp_lock_pkt(fsp))
1466 fsp->recov_retry = 0;
1467 opcode = fc_frame_payload_op(fp);
1468 if (opcode == ELS_LS_RJT) {
1469 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1470 switch (rjt->er_reason) {
1472 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1473 "reason %d expl %d\n",
1474 fsp->rport->port_id, rjt->er_reason,
1478 FC_FCP_DBG(fsp, "device does not support REC\n");
1479 rpriv = fsp->rport->dd_data;
1481 * if we do not spport RECs or got some bogus
1482 * reason then resetup timer so we check for
1485 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1490 * If no data transfer, the command frame got dropped
1491 * so we just retry. If data was transferred, we
1492 * lost the response but the target has no record,
1493 * so we abort and retry.
1495 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1496 fsp->xfer_len == 0) {
1497 fc_fcp_retry_cmd(fsp);
1500 fc_fcp_recovery(fsp, FC_ERROR);
1503 } else if (opcode == ELS_LS_ACC) {
1504 if (fsp->state & FC_SRB_ABORTED)
1507 data_dir = fsp->cmd->sc_data_direction;
1508 recp = fc_frame_payload_get(fp, sizeof(*recp));
1509 offset = ntohl(recp->reca_fc4value);
1510 e_stat = ntohl(recp->reca_e_stat);
1512 if (e_stat & ESB_ST_COMPLETE) {
1515 * The exchange is complete.
1517 * For output, we must've lost the response.
1518 * For input, all data must've been sent.
1519 * We lost may have lost the response
1520 * (and a confirmation was requested) and maybe
1523 * If all data received, send SRR
1524 * asking for response. If partial data received,
1525 * or gaps, SRR requests data at start of gap.
1526 * Recovery via SRR relies on in-order-delivery.
1528 if (data_dir == DMA_TO_DEVICE) {
1529 r_ctl = FC_RCTL_DD_CMD_STATUS;
1530 } else if (fsp->xfer_contig_end == offset) {
1531 r_ctl = FC_RCTL_DD_CMD_STATUS;
1533 offset = fsp->xfer_contig_end;
1534 r_ctl = FC_RCTL_DD_SOL_DATA;
1536 fc_fcp_srr(fsp, r_ctl, offset);
1537 } else if (e_stat & ESB_ST_SEQ_INIT) {
1538 unsigned int rec_tov = get_fsp_rec_tov(fsp);
1540 * The remote port has the initiative, so just
1541 * keep waiting for it to complete.
1543 fc_fcp_timer_set(fsp, rec_tov);
1547 * The exchange is incomplete, we have seq. initiative.
1548 * Lost response with requested confirmation,
1549 * lost confirmation, lost transfer ready or
1552 * For output, if not all data was received, ask
1553 * for transfer ready to be repeated.
1555 * If we received or sent all the data, send SRR to
1558 * If we lost a response, we may have lost some read
1561 r_ctl = FC_RCTL_DD_SOL_DATA;
1562 if (data_dir == DMA_TO_DEVICE) {
1563 r_ctl = FC_RCTL_DD_CMD_STATUS;
1564 if (offset < fsp->data_len)
1565 r_ctl = FC_RCTL_DD_DATA_DESC;
1566 } else if (offset == fsp->xfer_contig_end) {
1567 r_ctl = FC_RCTL_DD_CMD_STATUS;
1568 } else if (fsp->xfer_contig_end < offset) {
1569 offset = fsp->xfer_contig_end;
1571 fc_fcp_srr(fsp, r_ctl, offset);
1575 fc_fcp_unlock_pkt(fsp);
1577 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1582 * fc_fcp_rec_error() - Handler for REC errors
1583 * @fsp: The FCP packet the error is on
1584 * @fp: The REC frame
1586 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1588 int error = PTR_ERR(fp);
1590 if (fc_fcp_lock_pkt(fsp))
1595 fc_fcp_retry_cmd(fsp);
1599 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1600 fsp, fsp->rport->port_id, error);
1601 fsp->status_code = FC_CMD_PLOGO;
1604 case -FC_EX_TIMEOUT:
1606 * Assume REC or LS_ACC was lost.
1607 * The exchange manager will have aborted REC, so retry.
1609 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
1610 fsp->rport->port_id, error, fsp->recov_retry,
1611 FC_MAX_RECOV_RETRY);
1612 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1615 fc_fcp_recovery(fsp, FC_ERROR);
1618 fc_fcp_unlock_pkt(fsp);
1620 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1624 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1625 * @fsp: The FCP pkt that needs to be aborted
1627 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1629 fsp->status_code = code;
1630 fsp->cdb_status = 0;
1633 * if this fails then we let the scsi command timer fire and
1636 fc_fcp_send_abort(fsp);
1640 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1641 * @fsp: The FCP packet the SRR is to be sent on
1642 * @r_ctl: The R_CTL field for the SRR request
1643 * This is called after receiving status but insufficient data, or
1644 * when expecting status but the request has timed out.
1646 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1648 struct fc_lport *lport = fsp->lp;
1649 struct fc_rport *rport;
1650 struct fc_rport_libfc_priv *rpriv;
1651 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1653 struct fcp_srr *srr;
1654 struct fc_frame *fp;
1656 unsigned int rec_tov;
1659 rpriv = rport->dd_data;
1660 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1662 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1663 rpriv->rp_state != RPORT_ST_READY)
1664 goto retry; /* shouldn't happen */
1665 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1669 srr = fc_frame_payload_get(fp, sizeof(*srr));
1670 memset(srr, 0, sizeof(*srr));
1671 srr->srr_op = ELS_SRR;
1672 srr->srr_ox_id = htons(ep->oxid);
1673 srr->srr_rx_id = htons(ep->rxid);
1674 srr->srr_r_ctl = r_ctl;
1675 srr->srr_rel_off = htonl(offset);
1677 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1678 rpriv->local_port->port_id, FC_TYPE_FCP,
1681 rec_tov = get_fsp_rec_tov(fsp);
1682 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
1683 fsp, jiffies_to_msecs(rec_tov));
1687 fsp->recov_seq = seq;
1688 fsp->xfer_len = offset;
1689 fsp->xfer_contig_end = offset;
1690 fsp->state &= ~FC_SRB_RCV_STATUS;
1691 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1694 fc_fcp_retry_cmd(fsp);
1698 * fc_fcp_srr_resp() - Handler for SRR response
1699 * @seq: The sequence the SRR is on
1700 * @fp: The SRR frame
1701 * @arg: The FCP packet the SRR is on
1703 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1705 struct fc_fcp_pkt *fsp = arg;
1706 struct fc_frame_header *fh;
1707 unsigned int rec_tov;
1710 fc_fcp_srr_error(fsp, fp);
1714 if (fc_fcp_lock_pkt(fsp))
1717 fh = fc_frame_header_get(fp);
1719 * BUG? fc_fcp_srr_error calls exch_done which would release
1720 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1721 * then fc_exch_timeout would be sending an abort. The exch_done
1722 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1723 * an abort response though.
1725 if (fh->fh_type == FC_TYPE_BLS) {
1726 fc_fcp_unlock_pkt(fsp);
1730 fsp->recov_seq = NULL;
1731 switch (fc_frame_payload_op(fp)) {
1733 fsp->recov_retry = 0;
1734 rec_tov = get_fsp_rec_tov(fsp);
1735 fc_fcp_timer_set(fsp, rec_tov);
1739 fc_fcp_recovery(fsp, FC_ERROR);
1742 fc_fcp_unlock_pkt(fsp);
1743 fsp->lp->tt.exch_done(seq);
1746 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1750 * fc_fcp_srr_error() - Handler for SRR errors
1751 * @fsp: The FCP packet that the SRR error is on
1752 * @fp: The SRR frame
1754 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1756 if (fc_fcp_lock_pkt(fsp))
1758 fsp->lp->tt.exch_done(fsp->recov_seq);
1759 fsp->recov_seq = NULL;
1760 switch (PTR_ERR(fp)) {
1761 case -FC_EX_TIMEOUT:
1762 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1765 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1767 case -FC_EX_CLOSED: /* e.g., link failure */
1770 fc_fcp_retry_cmd(fsp);
1773 fc_fcp_unlock_pkt(fsp);
1775 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1779 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1780 * @lport: The local port to be checked
1782 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1785 return (lport->state == LPORT_ST_READY) &&
1786 lport->link_up && !lport->qfull;
1790 * fc_queuecommand() - The queuecommand function of the SCSI template
1791 * @cmd: The scsi_cmnd to be executed
1792 * @done: The callback function to be called when the scsi_cmnd is complete
1794 * This is the i/o strategy routine, called by the SCSI layer. This routine
1795 * is called with the host_lock held.
1797 static int fc_queuecommand_lck(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1799 struct fc_lport *lport;
1800 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1801 struct fc_fcp_pkt *fsp;
1802 struct fc_rport_libfc_priv *rpriv;
1805 struct fcoe_dev_stats *stats;
1807 lport = shost_priv(sc_cmd->device->host);
1809 rval = fc_remote_port_chkready(rport);
1811 sc_cmd->result = rval;
1815 spin_unlock_irq(lport->host->host_lock);
1817 if (!*(struct fc_remote_port **)rport->dd_data) {
1819 * rport is transitioning from blocked/deleted to
1822 sc_cmd->result = DID_IMM_RETRY << 16;
1827 rpriv = rport->dd_data;
1829 if (!fc_fcp_lport_queue_ready(lport)) {
1831 fc_fcp_can_queue_ramp_down(lport);
1832 rc = SCSI_MLQUEUE_HOST_BUSY;
1836 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1838 rc = SCSI_MLQUEUE_HOST_BUSY;
1843 * build the libfc request pkt
1845 fsp->cmd = sc_cmd; /* save the cmd */
1846 fsp->rport = rport; /* set the remote port ptr */
1847 sc_cmd->scsi_done = done;
1850 * set up the transfer length
1852 fsp->data_len = scsi_bufflen(sc_cmd);
1856 * setup the data direction
1858 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1859 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1860 fsp->req_flags = FC_SRB_READ;
1861 stats->InputRequests++;
1862 stats->InputBytes += fsp->data_len;
1863 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1864 fsp->req_flags = FC_SRB_WRITE;
1865 stats->OutputRequests++;
1866 stats->OutputBytes += fsp->data_len;
1869 stats->ControlRequests++;
1873 init_timer(&fsp->timer);
1874 fsp->timer.data = (unsigned long)fsp;
1877 * send it to the lower layer
1878 * if we get -1 return then put the request in the pending
1881 rval = fc_fcp_pkt_send(lport, fsp);
1883 fsp->state = FC_SRB_FREE;
1884 fc_fcp_pkt_release(fsp);
1885 rc = SCSI_MLQUEUE_HOST_BUSY;
1888 spin_lock_irq(lport->host->host_lock);
1892 DEF_SCSI_QCMD(fc_queuecommand)
1893 EXPORT_SYMBOL(fc_queuecommand);
1896 * fc_io_compl() - Handle responses for completed commands
1897 * @fsp: The FCP packet that is complete
1899 * Translates fcp_pkt errors to a Linux SCSI errors.
1900 * The fcp packet lock must be held when calling.
1902 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1904 struct fc_fcp_internal *si;
1905 struct scsi_cmnd *sc_cmd;
1906 struct fc_lport *lport;
1907 unsigned long flags;
1909 /* release outstanding ddp context */
1910 fc_fcp_ddp_done(fsp);
1912 fsp->state |= FC_SRB_COMPL;
1913 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1914 spin_unlock_bh(&fsp->scsi_pkt_lock);
1915 del_timer_sync(&fsp->timer);
1916 spin_lock_bh(&fsp->scsi_pkt_lock);
1920 si = fc_get_scsi_internal(lport);
1923 * if can_queue ramp down is done then try can_queue ramp up
1924 * since commands are completing now.
1926 if (si->last_can_queue_ramp_down_time)
1927 fc_fcp_can_queue_ramp_up(lport);
1930 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1931 switch (fsp->status_code) {
1933 if (fsp->cdb_status == 0) {
1937 sc_cmd->result = DID_OK << 16;
1938 if (fsp->scsi_resid)
1939 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1942 * transport level I/O was ok but scsi
1943 * has non zero status
1945 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1949 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1950 "due to FC_ERROR\n");
1951 sc_cmd->result = DID_ERROR << 16;
1953 case FC_DATA_UNDRUN:
1954 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1956 * scsi status is good but transport level
1959 if (fsp->state & FC_SRB_RCV_STATUS) {
1960 sc_cmd->result = DID_OK << 16;
1962 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
1963 " due to FC_DATA_UNDRUN (trans)\n");
1964 sc_cmd->result = DID_ERROR << 16;
1968 * scsi got underrun, this is an error
1970 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1971 "due to FC_DATA_UNDRUN (scsi)\n");
1972 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1973 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1976 case FC_DATA_OVRRUN:
1978 * overrun is an error
1980 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1981 "due to FC_DATA_OVRRUN\n");
1982 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1984 case FC_CMD_ABORTED:
1985 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1986 "due to FC_CMD_ABORTED\n");
1987 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1990 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
1991 "due to FC_CMD_RESET\n");
1992 sc_cmd->result = (DID_RESET << 16);
1995 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
1996 "due to FC_HRD_ERROR\n");
1997 sc_cmd->result = (DID_NO_CONNECT << 16);
2000 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
2001 "due to FC_CRC_ERROR\n");
2002 sc_cmd->result = (DID_PARITY << 16);
2005 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
2006 "due to FC_TIMED_OUT\n");
2007 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
2010 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2011 "due to unknown error\n");
2012 sc_cmd->result = (DID_ERROR << 16);
2016 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
2017 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
2019 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2020 list_del(&fsp->list);
2021 sc_cmd->SCp.ptr = NULL;
2022 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2023 sc_cmd->scsi_done(sc_cmd);
2025 /* release ref from initial allocation in queue command */
2026 fc_fcp_pkt_release(fsp);
2030 * fc_eh_abort() - Abort a command
2031 * @sc_cmd: The SCSI command to abort
2033 * From SCSI host template.
2034 * Send an ABTS to the target device and wait for the response.
2036 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2038 struct fc_fcp_pkt *fsp;
2039 struct fc_lport *lport;
2040 struct fc_fcp_internal *si;
2042 unsigned long flags;
2044 lport = shost_priv(sc_cmd->device->host);
2045 if (lport->state != LPORT_ST_READY)
2047 else if (!lport->link_up)
2050 si = fc_get_scsi_internal(lport);
2051 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2052 fsp = CMD_SP(sc_cmd);
2054 /* command completed while scsi eh was setting up */
2055 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2058 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2059 fc_fcp_pkt_hold(fsp);
2060 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2062 if (fc_fcp_lock_pkt(fsp)) {
2063 /* completed while we were waiting for timer to be deleted */
2068 rc = fc_fcp_pkt_abort(fsp);
2069 fc_fcp_unlock_pkt(fsp);
2072 fc_fcp_pkt_release(fsp);
2075 EXPORT_SYMBOL(fc_eh_abort);
2078 * fc_eh_device_reset() - Reset a single LUN
2079 * @sc_cmd: The SCSI command which identifies the device whose
2080 * LUN is to be reset
2082 * Set from SCSI host template.
2084 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2086 struct fc_lport *lport;
2087 struct fc_fcp_pkt *fsp;
2088 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2092 rval = fc_remote_port_chkready(rport);
2096 lport = shost_priv(sc_cmd->device->host);
2098 if (lport->state != LPORT_ST_READY)
2101 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2103 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2105 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2110 * Build the libfc request pkt. Do not set the scsi cmnd, because
2111 * the sc passed in is not setup for execution like when sent
2112 * through the queuecommand callout.
2114 fsp->rport = rport; /* set the remote port ptr */
2117 * flush outstanding commands
2119 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2120 fsp->state = FC_SRB_FREE;
2121 fc_fcp_pkt_release(fsp);
2126 EXPORT_SYMBOL(fc_eh_device_reset);
2129 * fc_eh_host_reset() - Reset a Scsi_Host.
2130 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2132 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2134 struct Scsi_Host *shost = sc_cmd->device->host;
2135 struct fc_lport *lport = shost_priv(shost);
2136 unsigned long wait_tmo;
2138 FC_SCSI_DBG(lport, "Resetting host\n");
2140 lport->tt.lport_reset(lport);
2141 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2142 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2146 if (fc_fcp_lport_queue_ready(lport)) {
2147 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2148 "on port (%6.6x)\n", lport->port_id);
2151 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2152 "port (%6.6x) is not ready.\n",
2157 EXPORT_SYMBOL(fc_eh_host_reset);
2160 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2161 * @sdev: The SCSI device that identifies the SCSI host
2163 * Configures queue depth based on host's cmd_per_len. If not set
2164 * then we use the libfc default.
2166 int fc_slave_alloc(struct scsi_device *sdev)
2168 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2170 if (!rport || fc_remote_port_chkready(rport))
2173 if (sdev->tagged_supported)
2174 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2176 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2177 FC_FCP_DFLT_QUEUE_DEPTH);
2181 EXPORT_SYMBOL(fc_slave_alloc);
2184 * fc_change_queue_depth() - Change a device's queue depth
2185 * @sdev: The SCSI device whose queue depth is to change
2186 * @qdepth: The new queue depth
2187 * @reason: The resason for the change
2189 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2192 case SCSI_QDEPTH_DEFAULT:
2193 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2195 case SCSI_QDEPTH_QFULL:
2196 scsi_track_queue_full(sdev, qdepth);
2198 case SCSI_QDEPTH_RAMP_UP:
2199 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2204 return sdev->queue_depth;
2206 EXPORT_SYMBOL(fc_change_queue_depth);
2209 * fc_change_queue_type() - Change a device's queue type
2210 * @sdev: The SCSI device whose queue depth is to change
2211 * @tag_type: Identifier for queue type
2213 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2215 if (sdev->tagged_supported) {
2216 scsi_set_tag_type(sdev, tag_type);
2218 scsi_activate_tcq(sdev, sdev->queue_depth);
2220 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2226 EXPORT_SYMBOL(fc_change_queue_type);
2229 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2230 * @lport: The local port that no longer needs the FCP layer
2232 void fc_fcp_destroy(struct fc_lport *lport)
2234 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2236 if (!list_empty(&si->scsi_pkt_queue))
2237 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2238 "port (%6.6x)\n", lport->port_id);
2240 mempool_destroy(si->scsi_pkt_pool);
2242 lport->scsi_priv = NULL;
2244 EXPORT_SYMBOL(fc_fcp_destroy);
2250 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2251 sizeof(struct fc_fcp_pkt),
2252 0, SLAB_HWCACHE_ALIGN, NULL);
2253 if (!scsi_pkt_cachep) {
2254 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2255 "module load failed!");
2262 void fc_destroy_fcp()
2264 if (scsi_pkt_cachep)
2265 kmem_cache_destroy(scsi_pkt_cachep);
2269 * fc_fcp_init() - Initialize the FCP layer for a local port
2270 * @lport: The local port to initialize the exchange layer for
2272 int fc_fcp_init(struct fc_lport *lport)
2275 struct fc_fcp_internal *si;
2277 if (!lport->tt.fcp_cmd_send)
2278 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2280 if (!lport->tt.fcp_cleanup)
2281 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2283 if (!lport->tt.fcp_abort_io)
2284 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2286 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2289 lport->scsi_priv = si;
2290 si->max_can_queue = lport->host->can_queue;
2291 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2292 spin_lock_init(&si->scsi_queue_lock);
2294 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2295 if (!si->scsi_pkt_pool) {
2305 EXPORT_SYMBOL(fc_fcp_init);