thinkpad-acpi: explain errors from acpi_install_notify_handler
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / libfc / fc_fcp.c
blob7a144026b49bfb3605d788eed41c381cb6d9d977
1 /*
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
13 * more details.
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 * Maintained at www.Open-FCoE.org
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
31 #include <scsi/scsi_tcq.h>
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_cmnd.h>
37 #include <scsi/fc/fc_fc2.h>
39 #include <scsi/libfc.h>
40 #include <scsi/fc_encode.h>
42 MODULE_AUTHOR("Open-FCoE.org");
43 MODULE_DESCRIPTION("libfc");
44 MODULE_LICENSE("GPL v2");
46 unsigned int fc_debug_logging;
47 module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);
48 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
50 static struct kmem_cache *scsi_pkt_cachep;
52 /* SRB state definitions */
53 #define FC_SRB_FREE 0 /* cmd is free */
54 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
55 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
56 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
57 #define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */
58 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
59 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
60 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
61 #define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */
63 #define FC_SRB_READ (1 << 1)
64 #define FC_SRB_WRITE (1 << 0)
67 * The SCp.ptr should be tested and set under the host lock. NULL indicates
68 * that the command has been retruned to the scsi layer.
70 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
71 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
72 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
73 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
74 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
76 struct fc_fcp_internal {
77 mempool_t *scsi_pkt_pool;
78 struct list_head scsi_pkt_queue;
79 u8 throttled;
82 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
85 * function prototypes
86 * FC scsi I/O related functions
88 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
89 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
90 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
91 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
92 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
93 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp);
94 static void fc_timeout_error(struct fc_fcp_pkt *);
95 static void fc_fcp_timeout(unsigned long data);
96 static void fc_fcp_rec(struct fc_fcp_pkt *);
97 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
98 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
99 static void fc_io_compl(struct fc_fcp_pkt *);
101 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
102 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
103 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
106 * command status codes
108 #define FC_COMPLETE 0
109 #define FC_CMD_ABORTED 1
110 #define FC_CMD_RESET 2
111 #define FC_CMD_PLOGO 3
112 #define FC_SNS_RCV 4
113 #define FC_TRANS_ERR 5
114 #define FC_DATA_OVRRUN 6
115 #define FC_DATA_UNDRUN 7
116 #define FC_ERROR 8
117 #define FC_HRD_ERROR 9
118 #define FC_CMD_TIME_OUT 10
121 * Error recovery timeout values.
123 #define FC_SCSI_ER_TIMEOUT (10 * HZ)
124 #define FC_SCSI_TM_TOV (10 * HZ)
125 #define FC_SCSI_REC_TOV (2 * HZ)
126 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
128 #define FC_MAX_ERROR_CNT 5
129 #define FC_MAX_RECOV_RETRY 3
131 #define FC_FCP_DFLT_QUEUE_DEPTH 32
134 * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet
135 * @lp: fc lport struct
136 * @gfp: gfp flags for allocation
138 * This is used by upper layer scsi driver.
139 * Return Value : scsi_pkt structure or null on allocation failure.
140 * Context : call from process context. no locking required.
142 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp)
144 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
145 struct fc_fcp_pkt *fsp;
147 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
148 if (fsp) {
149 memset(fsp, 0, sizeof(*fsp));
150 fsp->lp = lp;
151 atomic_set(&fsp->ref_cnt, 1);
152 init_timer(&fsp->timer);
153 INIT_LIST_HEAD(&fsp->list);
154 spin_lock_init(&fsp->scsi_pkt_lock);
156 return fsp;
160 * fc_fcp_pkt_release() - release hold on scsi_pkt packet
161 * @fsp: fcp packet struct
163 * This is used by upper layer scsi driver.
164 * Context : call from process and interrupt context.
165 * no locking required
167 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
169 if (atomic_dec_and_test(&fsp->ref_cnt)) {
170 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
172 mempool_free(fsp, si->scsi_pkt_pool);
176 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
178 atomic_inc(&fsp->ref_cnt);
182 * fc_fcp_pkt_destory() - release hold on scsi_pkt packet
183 * @seq: exchange sequence
184 * @fsp: fcp packet struct
186 * Release hold on scsi_pkt packet set to keep scsi_pkt
187 * till EM layer exch resource is not freed.
188 * Context : called from from EM layer.
189 * no locking required
191 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
193 fc_fcp_pkt_release(fsp);
197 * fc_fcp_lock_pkt() - lock a packet and get a ref to it.
198 * @fsp: fcp packet
200 * We should only return error if we return a command to scsi-ml before
201 * getting a response. This can happen in cases where we send a abort, but
202 * do not wait for the response and the abort and command can be passing
203 * each other on the wire/network-layer.
205 * Note: this function locks the packet and gets a reference to allow
206 * callers to call the completion function while the lock is held and
207 * not have to worry about the packets refcount.
209 * TODO: Maybe we should just have callers grab/release the lock and
210 * have a function that they call to verify the fsp and grab a ref if
211 * needed.
213 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
215 spin_lock_bh(&fsp->scsi_pkt_lock);
216 if (fsp->state & FC_SRB_COMPL) {
217 spin_unlock_bh(&fsp->scsi_pkt_lock);
218 return -EPERM;
221 fc_fcp_pkt_hold(fsp);
222 return 0;
225 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
227 spin_unlock_bh(&fsp->scsi_pkt_lock);
228 fc_fcp_pkt_release(fsp);
231 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
233 if (!(fsp->state & FC_SRB_COMPL))
234 mod_timer(&fsp->timer, jiffies + delay);
237 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
239 if (!fsp->seq_ptr)
240 return -EINVAL;
242 fsp->state |= FC_SRB_ABORT_PENDING;
243 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
247 * Retry command.
248 * An abort isn't needed.
250 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
252 if (fsp->seq_ptr) {
253 fsp->lp->tt.exch_done(fsp->seq_ptr);
254 fsp->seq_ptr = NULL;
257 fsp->state &= ~FC_SRB_ABORT_PENDING;
258 fsp->io_status = 0;
259 fsp->status_code = FC_ERROR;
260 fc_fcp_complete_locked(fsp);
264 * fc_fcp_ddp_setup - calls to LLD's ddp_setup to set up DDP
265 * transfer for a read I/O indicated by the fc_fcp_pkt.
266 * @fsp: ptr to the fc_fcp_pkt
268 * This is called in exch_seq_send() when we have a newly allocated
269 * exchange with a valid exchange id to setup ddp.
271 * returns: none
273 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
275 struct fc_lport *lp;
277 if (!fsp)
278 return;
280 lp = fsp->lp;
281 if ((fsp->req_flags & FC_SRB_READ) &&
282 (lp->lro_enabled) && (lp->tt.ddp_setup)) {
283 if (lp->tt.ddp_setup(lp, xid, scsi_sglist(fsp->cmd),
284 scsi_sg_count(fsp->cmd)))
285 fsp->xfer_ddp = xid;
288 EXPORT_SYMBOL(fc_fcp_ddp_setup);
291 * fc_fcp_ddp_done - calls to LLD's ddp_done to release any
292 * DDP related resources for this I/O if it is initialized
293 * as a ddp transfer
294 * @fsp: ptr to the fc_fcp_pkt
296 * returns: none
298 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
300 struct fc_lport *lp;
302 if (!fsp)
303 return;
305 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
306 return;
308 lp = fsp->lp;
309 if (lp->tt.ddp_done) {
310 fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp);
311 fsp->xfer_ddp = FC_XID_UNKNOWN;
317 * Receive SCSI data from target.
318 * Called after receiving solicited data.
320 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
322 struct scsi_cmnd *sc = fsp->cmd;
323 struct fc_lport *lp = fsp->lp;
324 struct fcoe_dev_stats *stats;
325 struct fc_frame_header *fh;
326 size_t start_offset;
327 size_t offset;
328 u32 crc;
329 u32 copy_len = 0;
330 size_t len;
331 void *buf;
332 struct scatterlist *sg;
333 size_t remaining;
335 fh = fc_frame_header_get(fp);
336 offset = ntohl(fh->fh_parm_offset);
337 start_offset = offset;
338 len = fr_len(fp) - sizeof(*fh);
339 buf = fc_frame_payload_get(fp, 0);
341 /* if this I/O is ddped, update xfer len */
342 fc_fcp_ddp_done(fsp);
344 if (offset + len > fsp->data_len) {
345 /* this should never happen */
346 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
347 fc_frame_crc_check(fp))
348 goto crc_err;
349 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
350 "data_len %x\n", len, offset, fsp->data_len);
351 fc_fcp_retry_cmd(fsp);
352 return;
354 if (offset != fsp->xfer_len)
355 fsp->state |= FC_SRB_DISCONTIG;
357 crc = 0;
358 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
359 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
361 sg = scsi_sglist(sc);
362 remaining = len;
364 while (remaining > 0 && sg) {
365 size_t off;
366 void *page_addr;
367 size_t sg_bytes;
369 if (offset >= sg->length) {
370 offset -= sg->length;
371 sg = sg_next(sg);
372 continue;
374 sg_bytes = min(remaining, sg->length - offset);
377 * The scatterlist item may be bigger than PAGE_SIZE,
378 * but we are limited to mapping PAGE_SIZE at a time.
380 off = offset + sg->offset;
381 sg_bytes = min(sg_bytes, (size_t)
382 (PAGE_SIZE - (off & ~PAGE_MASK)));
383 page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
384 KM_SOFTIRQ0);
385 if (!page_addr)
386 break; /* XXX panic? */
388 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
389 crc = crc32(crc, buf, sg_bytes);
390 memcpy((char *)page_addr + (off & ~PAGE_MASK), buf,
391 sg_bytes);
393 kunmap_atomic(page_addr, KM_SOFTIRQ0);
394 buf += sg_bytes;
395 offset += sg_bytes;
396 remaining -= sg_bytes;
397 copy_len += sg_bytes;
400 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
401 buf = fc_frame_payload_get(fp, 0);
402 if (len % 4) {
403 crc = crc32(crc, buf + len, 4 - (len % 4));
404 len += 4 - (len % 4);
407 if (~crc != le32_to_cpu(fr_crc(fp))) {
408 crc_err:
409 stats = fc_lport_get_stats(lp);
410 stats->ErrorFrames++;
411 /* FIXME - per cpu count, not total count! */
412 if (stats->InvalidCRCCount++ < 5)
413 printk(KERN_WARNING "libfc: CRC error on data "
414 "frame for port (%6x)\n",
415 fc_host_port_id(lp->host));
417 * Assume the frame is total garbage.
418 * We may have copied it over the good part
419 * of the buffer.
420 * If so, we need to retry the entire operation.
421 * Otherwise, ignore it.
423 if (fsp->state & FC_SRB_DISCONTIG)
424 fc_fcp_retry_cmd(fsp);
425 return;
429 if (fsp->xfer_contig_end == start_offset)
430 fsp->xfer_contig_end += copy_len;
431 fsp->xfer_len += copy_len;
434 * In the very rare event that this data arrived after the response
435 * and completes the transfer, call the completion handler.
437 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
438 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
439 fc_fcp_complete_locked(fsp);
443 * fc_fcp_send_data() - Send SCSI data to target.
444 * @fsp: ptr to fc_fcp_pkt
445 * @sp: ptr to this sequence
446 * @offset: starting offset for this data request
447 * @seq_blen: the burst length for this data request
449 * Called after receiving a Transfer Ready data descriptor.
450 * if LLD is capable of seq offload then send down seq_blen
451 * size of data in single frame, otherwise send multiple FC
452 * frames of max FC frame payload supported by target port.
454 * Returns : 0 for success.
456 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
457 size_t offset, size_t seq_blen)
459 struct fc_exch *ep;
460 struct scsi_cmnd *sc;
461 struct scatterlist *sg;
462 struct fc_frame *fp = NULL;
463 struct fc_lport *lp = fsp->lp;
464 size_t remaining;
465 size_t t_blen;
466 size_t tlen;
467 size_t sg_bytes;
468 size_t frame_offset, fh_parm_offset;
469 int error;
470 void *data = NULL;
471 void *page_addr;
472 int using_sg = lp->sg_supp;
473 u32 f_ctl;
475 WARN_ON(seq_blen <= 0);
476 if (unlikely(offset + seq_blen > fsp->data_len)) {
477 /* this should never happen */
478 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
479 "offset %zx\n", seq_blen, offset);
480 fc_fcp_send_abort(fsp);
481 return 0;
482 } else if (offset != fsp->xfer_len) {
483 /* Out of Order Data Request - no problem, but unexpected. */
484 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
485 "seq_blen %zx offset %zx\n", seq_blen, offset);
489 * if LLD is capable of seq_offload then set transport
490 * burst length (t_blen) to seq_blen, otherwise set t_blen
491 * to max FC frame payload previously set in fsp->max_payload.
493 t_blen = fsp->max_payload;
494 if (lp->seq_offload) {
495 t_blen = min(seq_blen, (size_t)lp->lso_max);
496 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
497 fsp, seq_blen, lp->lso_max, t_blen);
500 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
501 if (t_blen > 512)
502 t_blen &= ~(512 - 1); /* round down to block size */
503 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
504 sc = fsp->cmd;
506 remaining = seq_blen;
507 fh_parm_offset = frame_offset = offset;
508 tlen = 0;
509 seq = lp->tt.seq_start_next(seq);
510 f_ctl = FC_FC_REL_OFF;
511 WARN_ON(!seq);
513 sg = scsi_sglist(sc);
515 while (remaining > 0 && sg) {
516 if (offset >= sg->length) {
517 offset -= sg->length;
518 sg = sg_next(sg);
519 continue;
521 if (!fp) {
522 tlen = min(t_blen, remaining);
525 * TODO. Temporary workaround. fc_seq_send() can't
526 * handle odd lengths in non-linear skbs.
527 * This will be the final fragment only.
529 if (tlen % 4)
530 using_sg = 0;
531 if (using_sg) {
532 fp = _fc_frame_alloc(lp, 0);
533 if (!fp)
534 return -ENOMEM;
535 } else {
536 fp = fc_frame_alloc(lp, tlen);
537 if (!fp)
538 return -ENOMEM;
540 data = (void *)(fr_hdr(fp)) +
541 sizeof(struct fc_frame_header);
543 fh_parm_offset = frame_offset;
544 fr_max_payload(fp) = fsp->max_payload;
546 sg_bytes = min(tlen, sg->length - offset);
547 if (using_sg) {
548 get_page(sg_page(sg));
549 skb_fill_page_desc(fp_skb(fp),
550 skb_shinfo(fp_skb(fp))->nr_frags,
551 sg_page(sg), sg->offset + offset,
552 sg_bytes);
553 fp_skb(fp)->data_len += sg_bytes;
554 fr_len(fp) += sg_bytes;
555 fp_skb(fp)->truesize += PAGE_SIZE;
556 } else {
557 size_t off = offset + sg->offset;
560 * The scatterlist item may be bigger than PAGE_SIZE,
561 * but we must not cross pages inside the kmap.
563 sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE -
564 (off & ~PAGE_MASK)));
565 page_addr = kmap_atomic(sg_page(sg) +
566 (off >> PAGE_SHIFT),
567 KM_SOFTIRQ0);
568 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
569 sg_bytes);
570 kunmap_atomic(page_addr, KM_SOFTIRQ0);
571 data += sg_bytes;
573 offset += sg_bytes;
574 frame_offset += sg_bytes;
575 tlen -= sg_bytes;
576 remaining -= sg_bytes;
578 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
579 (tlen))
580 continue;
583 * Send sequence with transfer sequence initiative in case
584 * this is last FCP frame of the sequence.
586 if (remaining == 0)
587 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
589 ep = fc_seq_exch(seq);
590 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
591 FC_TYPE_FCP, f_ctl, fh_parm_offset);
594 * send fragment using for a sequence.
596 error = lp->tt.seq_send(lp, seq, fp);
597 if (error) {
598 WARN_ON(1); /* send error should be rare */
599 fc_fcp_retry_cmd(fsp);
600 return 0;
602 fp = NULL;
604 fsp->xfer_len += seq_blen; /* premature count? */
605 return 0;
608 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
610 int ba_done = 1;
611 struct fc_ba_rjt *brp;
612 struct fc_frame_header *fh;
614 fh = fc_frame_header_get(fp);
615 switch (fh->fh_r_ctl) {
616 case FC_RCTL_BA_ACC:
617 break;
618 case FC_RCTL_BA_RJT:
619 brp = fc_frame_payload_get(fp, sizeof(*brp));
620 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
621 break;
622 /* fall thru */
623 default:
625 * we will let the command timeout
626 * and scsi-ml recover in this case,
627 * therefore cleared the ba_done flag.
629 ba_done = 0;
632 if (ba_done) {
633 fsp->state |= FC_SRB_ABORTED;
634 fsp->state &= ~FC_SRB_ABORT_PENDING;
636 if (fsp->wait_for_comp)
637 complete(&fsp->tm_done);
638 else
639 fc_fcp_complete_locked(fsp);
644 * fc_fcp_reduce_can_queue() - drop can_queue
645 * @lp: lport to drop queueing for
647 * If we are getting memory allocation failures, then we may
648 * be trying to execute too many commands. We let the running
649 * commands complete or timeout, then try again with a reduced
650 * can_queue. Eventually we will hit the point where we run
651 * on all reserved structs.
653 static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
655 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
656 unsigned long flags;
657 int can_queue;
659 spin_lock_irqsave(lp->host->host_lock, flags);
660 if (si->throttled)
661 goto done;
662 si->throttled = 1;
664 can_queue = lp->host->can_queue;
665 can_queue >>= 1;
666 if (!can_queue)
667 can_queue = 1;
668 lp->host->can_queue = can_queue;
669 shost_printk(KERN_ERR, lp->host, "libfc: Could not allocate frame.\n"
670 "Reducing can_queue to %d.\n", can_queue);
671 done:
672 spin_unlock_irqrestore(lp->host->host_lock, flags);
676 * fc_fcp_recv() - Reveive FCP frames
677 * @seq: The sequence the frame is on
678 * @fp: The FC frame
679 * @arg: The related FCP packet
681 * Return : None
682 * Context : called from Soft IRQ context
683 * can not called holding list lock
685 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
687 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
688 struct fc_lport *lport = fsp->lp;
689 struct fc_frame_header *fh;
690 struct fcp_txrdy *dd;
691 u8 r_ctl;
692 int rc = 0;
694 if (IS_ERR(fp))
695 goto errout;
697 fh = fc_frame_header_get(fp);
698 r_ctl = fh->fh_r_ctl;
700 if (!(lport->state & LPORT_ST_READY))
701 goto out;
702 if (fc_fcp_lock_pkt(fsp))
703 goto out;
704 fsp->last_pkt_time = jiffies;
706 if (fh->fh_type == FC_TYPE_BLS) {
707 fc_fcp_abts_resp(fsp, fp);
708 goto unlock;
711 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
712 goto unlock;
714 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
716 * received XFER RDY from the target
717 * need to send data to the target
719 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
720 dd = fc_frame_payload_get(fp, sizeof(*dd));
721 WARN_ON(!dd);
723 rc = fc_fcp_send_data(fsp, seq,
724 (size_t) ntohl(dd->ft_data_ro),
725 (size_t) ntohl(dd->ft_burst_len));
726 if (!rc)
727 seq->rec_data = fsp->xfer_len;
728 else if (rc == -ENOMEM)
729 fsp->state |= FC_SRB_NOMEM;
730 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
732 * received a DATA frame
733 * next we will copy the data to the system buffer
735 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
736 fc_fcp_recv_data(fsp, fp);
737 seq->rec_data = fsp->xfer_contig_end;
738 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
739 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
741 fc_fcp_resp(fsp, fp);
742 } else {
743 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
745 unlock:
746 fc_fcp_unlock_pkt(fsp);
747 out:
748 fc_frame_free(fp);
749 errout:
750 if (IS_ERR(fp))
751 fc_fcp_error(fsp, fp);
752 else if (rc == -ENOMEM)
753 fc_fcp_reduce_can_queue(lport);
756 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
758 struct fc_frame_header *fh;
759 struct fcp_resp *fc_rp;
760 struct fcp_resp_ext *rp_ex;
761 struct fcp_resp_rsp_info *fc_rp_info;
762 u32 plen;
763 u32 expected_len;
764 u32 respl = 0;
765 u32 snsl = 0;
766 u8 flags = 0;
768 plen = fr_len(fp);
769 fh = (struct fc_frame_header *)fr_hdr(fp);
770 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
771 goto len_err;
772 plen -= sizeof(*fh);
773 fc_rp = (struct fcp_resp *)(fh + 1);
774 fsp->cdb_status = fc_rp->fr_status;
775 flags = fc_rp->fr_flags;
776 fsp->scsi_comp_flags = flags;
777 expected_len = fsp->data_len;
779 /* if ddp, update xfer len */
780 fc_fcp_ddp_done(fsp);
782 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
783 rp_ex = (void *)(fc_rp + 1);
784 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
785 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
786 goto len_err;
787 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
788 if (flags & FCP_RSP_LEN_VAL) {
789 respl = ntohl(rp_ex->fr_rsp_len);
790 if (respl != sizeof(*fc_rp_info))
791 goto len_err;
792 if (fsp->wait_for_comp) {
793 /* Abuse cdb_status for rsp code */
794 fsp->cdb_status = fc_rp_info->rsp_code;
795 complete(&fsp->tm_done);
797 * tmfs will not have any scsi cmd so
798 * exit here
800 return;
801 } else
802 goto err;
804 if (flags & FCP_SNS_LEN_VAL) {
805 snsl = ntohl(rp_ex->fr_sns_len);
806 if (snsl > SCSI_SENSE_BUFFERSIZE)
807 snsl = SCSI_SENSE_BUFFERSIZE;
808 memcpy(fsp->cmd->sense_buffer,
809 (char *)fc_rp_info + respl, snsl);
812 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
813 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
814 goto len_err;
815 if (flags & FCP_RESID_UNDER) {
816 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
818 * The cmnd->underflow is the minimum number of
819 * bytes that must be transfered for this
820 * command. Provided a sense condition is not
821 * present, make sure the actual amount
822 * transferred is at least the underflow value
823 * or fail.
825 if (!(flags & FCP_SNS_LEN_VAL) &&
826 (fc_rp->fr_status == 0) &&
827 (scsi_bufflen(fsp->cmd) -
828 fsp->scsi_resid) < fsp->cmd->underflow)
829 goto err;
830 expected_len -= fsp->scsi_resid;
831 } else {
832 fsp->status_code = FC_ERROR;
836 fsp->state |= FC_SRB_RCV_STATUS;
839 * Check for missing or extra data frames.
841 if (unlikely(fsp->xfer_len != expected_len)) {
842 if (fsp->xfer_len < expected_len) {
844 * Some data may be queued locally,
845 * Wait a at least one jiffy to see if it is delivered.
846 * If this expires without data, we may do SRR.
848 fc_fcp_timer_set(fsp, 2);
849 return;
851 fsp->status_code = FC_DATA_OVRRUN;
852 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, "
853 "len %x, data len %x\n",
854 fsp->rport->port_id,
855 fsp->xfer_len, expected_len, fsp->data_len);
857 fc_fcp_complete_locked(fsp);
858 return;
860 len_err:
861 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
862 "snsl %u\n", flags, fr_len(fp), respl, snsl);
863 err:
864 fsp->status_code = FC_ERROR;
865 fc_fcp_complete_locked(fsp);
869 * fc_fcp_complete_locked() - complete processing of a fcp packet
870 * @fsp: fcp packet
872 * This function may sleep if a timer is pending. The packet lock must be
873 * held, and the host lock must not be held.
875 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
877 struct fc_lport *lp = fsp->lp;
878 struct fc_seq *seq;
879 struct fc_exch *ep;
880 u32 f_ctl;
882 if (fsp->state & FC_SRB_ABORT_PENDING)
883 return;
885 if (fsp->state & FC_SRB_ABORTED) {
886 if (!fsp->status_code)
887 fsp->status_code = FC_CMD_ABORTED;
888 } else {
890 * Test for transport underrun, independent of response
891 * underrun status.
893 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
894 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
895 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
896 fsp->status_code = FC_DATA_UNDRUN;
897 fsp->io_status = 0;
901 seq = fsp->seq_ptr;
902 if (seq) {
903 fsp->seq_ptr = NULL;
904 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
905 struct fc_frame *conf_frame;
906 struct fc_seq *csp;
908 csp = lp->tt.seq_start_next(seq);
909 conf_frame = fc_frame_alloc(fsp->lp, 0);
910 if (conf_frame) {
911 f_ctl = FC_FC_SEQ_INIT;
912 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
913 ep = fc_seq_exch(seq);
914 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
915 ep->did, ep->sid,
916 FC_TYPE_FCP, f_ctl, 0);
917 lp->tt.seq_send(lp, csp, conf_frame);
920 lp->tt.exch_done(seq);
922 fc_io_compl(fsp);
925 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
927 struct fc_lport *lp = fsp->lp;
929 if (fsp->seq_ptr) {
930 lp->tt.exch_done(fsp->seq_ptr);
931 fsp->seq_ptr = NULL;
933 fsp->status_code = error;
937 * fc_fcp_cleanup_each_cmd() - Cleanup active commads
938 * @lp: logical port
939 * @id: target id
940 * @lun: lun
941 * @error: fsp status code
943 * If lun or id is -1, they are ignored.
945 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
946 unsigned int lun, int error)
948 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
949 struct fc_fcp_pkt *fsp;
950 struct scsi_cmnd *sc_cmd;
951 unsigned long flags;
953 spin_lock_irqsave(lp->host->host_lock, flags);
954 restart:
955 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
956 sc_cmd = fsp->cmd;
957 if (id != -1 && scmd_id(sc_cmd) != id)
958 continue;
960 if (lun != -1 && sc_cmd->device->lun != lun)
961 continue;
963 fc_fcp_pkt_hold(fsp);
964 spin_unlock_irqrestore(lp->host->host_lock, flags);
966 if (!fc_fcp_lock_pkt(fsp)) {
967 fc_fcp_cleanup_cmd(fsp, error);
968 fc_io_compl(fsp);
969 fc_fcp_unlock_pkt(fsp);
972 fc_fcp_pkt_release(fsp);
973 spin_lock_irqsave(lp->host->host_lock, flags);
975 * while we dropped the lock multiple pkts could
976 * have been released, so we have to start over.
978 goto restart;
980 spin_unlock_irqrestore(lp->host->host_lock, flags);
983 static void fc_fcp_abort_io(struct fc_lport *lp)
985 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
989 * fc_fcp_pkt_send() - send a fcp packet to the lower level.
990 * @lp: fc lport
991 * @fsp: fc packet.
993 * This is called by upper layer protocol.
994 * Return : zero for success and -1 for failure
995 * Context : called from queuecommand which can be called from process
996 * or scsi soft irq.
997 * Locks : called with the host lock and irqs disabled.
999 static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
1001 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
1002 int rc;
1004 fsp->cmd->SCp.ptr = (char *)fsp;
1005 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1006 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1008 int_to_scsilun(fsp->cmd->device->lun,
1009 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1010 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1011 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1013 spin_unlock_irq(lp->host->host_lock);
1014 rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv);
1015 spin_lock_irq(lp->host->host_lock);
1016 if (rc)
1017 list_del(&fsp->list);
1019 return rc;
1022 static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1023 void (*resp)(struct fc_seq *,
1024 struct fc_frame *fp,
1025 void *arg))
1027 struct fc_frame *fp;
1028 struct fc_seq *seq;
1029 struct fc_rport *rport;
1030 struct fc_rport_libfc_priv *rp;
1031 const size_t len = sizeof(fsp->cdb_cmd);
1032 int rc = 0;
1034 if (fc_fcp_lock_pkt(fsp))
1035 return 0;
1037 fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
1038 if (!fp) {
1039 rc = -1;
1040 goto unlock;
1043 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1044 fr_fsp(fp) = fsp;
1045 rport = fsp->rport;
1046 fsp->max_payload = rport->maxframe_size;
1047 rp = rport->dd_data;
1049 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1050 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1051 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1053 seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1054 if (!seq) {
1055 rc = -1;
1056 goto unlock;
1058 fsp->last_pkt_time = jiffies;
1059 fsp->seq_ptr = seq;
1060 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1062 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1063 fc_fcp_timer_set(fsp,
1064 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1065 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1066 unlock:
1067 fc_fcp_unlock_pkt(fsp);
1068 return rc;
1072 * transport error handler
1074 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1076 int error = PTR_ERR(fp);
1078 if (fc_fcp_lock_pkt(fsp))
1079 return;
1081 if (error == -FC_EX_CLOSED) {
1082 fc_fcp_retry_cmd(fsp);
1083 goto unlock;
1087 * clear abort pending, because the lower layer
1088 * decided to force completion.
1090 fsp->state &= ~FC_SRB_ABORT_PENDING;
1091 fsp->status_code = FC_CMD_PLOGO;
1092 fc_fcp_complete_locked(fsp);
1093 unlock:
1094 fc_fcp_unlock_pkt(fsp);
1098 * Scsi abort handler- calls to send an abort
1099 * and then wait for abort completion
1101 static int fc_fcp_pkt_abort(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
1103 int rc = FAILED;
1105 if (fc_fcp_send_abort(fsp))
1106 return FAILED;
1108 init_completion(&fsp->tm_done);
1109 fsp->wait_for_comp = 1;
1111 spin_unlock_bh(&fsp->scsi_pkt_lock);
1112 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1113 spin_lock_bh(&fsp->scsi_pkt_lock);
1114 fsp->wait_for_comp = 0;
1116 if (!rc) {
1117 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1118 rc = FAILED;
1119 } else if (fsp->state & FC_SRB_ABORTED) {
1120 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1121 rc = SUCCESS;
1122 fc_fcp_complete_locked(fsp);
1125 return rc;
1129 * Retry LUN reset after resource allocation failed.
1131 static void fc_lun_reset_send(unsigned long data)
1133 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1134 struct fc_lport *lp = fsp->lp;
1135 if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) {
1136 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1137 return;
1138 if (fc_fcp_lock_pkt(fsp))
1139 return;
1140 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1141 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1142 fc_fcp_unlock_pkt(fsp);
1147 * Scsi device reset handler- send a LUN RESET to the device
1148 * and wait for reset reply
1150 static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1151 unsigned int id, unsigned int lun)
1153 int rc;
1155 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1156 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1157 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1159 fsp->wait_for_comp = 1;
1160 init_completion(&fsp->tm_done);
1162 fc_lun_reset_send((unsigned long)fsp);
1165 * wait for completion of reset
1166 * after that make sure all commands are terminated
1168 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1170 spin_lock_bh(&fsp->scsi_pkt_lock);
1171 fsp->state |= FC_SRB_COMPL;
1172 spin_unlock_bh(&fsp->scsi_pkt_lock);
1174 del_timer_sync(&fsp->timer);
1176 spin_lock_bh(&fsp->scsi_pkt_lock);
1177 if (fsp->seq_ptr) {
1178 lp->tt.exch_done(fsp->seq_ptr);
1179 fsp->seq_ptr = NULL;
1181 fsp->wait_for_comp = 0;
1182 spin_unlock_bh(&fsp->scsi_pkt_lock);
1184 if (!rc) {
1185 FC_SCSI_DBG(lp, "lun reset failed\n");
1186 return FAILED;
1189 /* cdb_status holds the tmf's rsp code */
1190 if (fsp->cdb_status != FCP_TMF_CMPL)
1191 return FAILED;
1193 FC_SCSI_DBG(lp, "lun reset to lun %u completed\n", lun);
1194 fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED);
1195 return SUCCESS;
1199 * Task Managment response handler
1201 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1203 struct fc_fcp_pkt *fsp = arg;
1204 struct fc_frame_header *fh;
1206 if (IS_ERR(fp)) {
1208 * If there is an error just let it timeout or wait
1209 * for TMF to be aborted if it timedout.
1211 * scsi-eh will escalate for when either happens.
1213 return;
1216 if (fc_fcp_lock_pkt(fsp))
1217 return;
1220 * raced with eh timeout handler.
1222 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1223 spin_unlock_bh(&fsp->scsi_pkt_lock);
1224 return;
1227 fh = fc_frame_header_get(fp);
1228 if (fh->fh_type != FC_TYPE_BLS)
1229 fc_fcp_resp(fsp, fp);
1230 fsp->seq_ptr = NULL;
1231 fsp->lp->tt.exch_done(seq);
1232 fc_frame_free(fp);
1233 fc_fcp_unlock_pkt(fsp);
1236 static void fc_fcp_cleanup(struct fc_lport *lp)
1238 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
1242 * fc_fcp_timeout: called by OS timer function.
1244 * The timer has been inactivated and must be reactivated if desired
1245 * using fc_fcp_timer_set().
1247 * Algorithm:
1249 * If REC is supported, just issue it, and return. The REC exchange will
1250 * complete or time out, and recovery can continue at that point.
1252 * Otherwise, if the response has been received without all the data,
1253 * it has been ER_TIMEOUT since the response was received.
1255 * If the response has not been received,
1256 * we see if data was received recently. If it has been, we continue waiting,
1257 * otherwise, we abort the command.
1259 static void fc_fcp_timeout(unsigned long data)
1261 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1262 struct fc_rport *rport = fsp->rport;
1263 struct fc_rport_libfc_priv *rp = rport->dd_data;
1265 if (fc_fcp_lock_pkt(fsp))
1266 return;
1268 if (fsp->cdb_cmd.fc_tm_flags)
1269 goto unlock;
1271 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1273 if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
1274 fc_fcp_rec(fsp);
1275 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1276 jiffies))
1277 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1278 else if (fsp->state & FC_SRB_RCV_STATUS)
1279 fc_fcp_complete_locked(fsp);
1280 else
1281 fc_timeout_error(fsp);
1282 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1283 unlock:
1284 fc_fcp_unlock_pkt(fsp);
1288 * Send a REC ELS request
1290 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1292 struct fc_lport *lp;
1293 struct fc_frame *fp;
1294 struct fc_rport *rport;
1295 struct fc_rport_libfc_priv *rp;
1297 lp = fsp->lp;
1298 rport = fsp->rport;
1299 rp = rport->dd_data;
1300 if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) {
1301 fsp->status_code = FC_HRD_ERROR;
1302 fsp->io_status = 0;
1303 fc_fcp_complete_locked(fsp);
1304 return;
1306 fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec));
1307 if (!fp)
1308 goto retry;
1310 fr_seq(fp) = fsp->seq_ptr;
1311 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1312 fc_host_port_id(rp->local_port->host), FC_TYPE_ELS,
1313 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1314 if (lp->tt.elsct_send(lp, rport->port_id, fp, ELS_REC, fc_fcp_rec_resp,
1315 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1316 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1317 return;
1319 retry:
1320 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1321 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1322 else
1323 fc_timeout_error(fsp);
1327 * Receive handler for REC ELS frame
1328 * if it is a reject then let the scsi layer to handle
1329 * the timeout. if it is a LS_ACC then if the io was not completed
1330 * then set the timeout and return otherwise complete the exchange
1331 * and tell the scsi layer to restart the I/O.
1333 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1335 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1336 struct fc_els_rec_acc *recp;
1337 struct fc_els_ls_rjt *rjt;
1338 u32 e_stat;
1339 u8 opcode;
1340 u32 offset;
1341 enum dma_data_direction data_dir;
1342 enum fc_rctl r_ctl;
1343 struct fc_rport_libfc_priv *rp;
1345 if (IS_ERR(fp)) {
1346 fc_fcp_rec_error(fsp, fp);
1347 return;
1350 if (fc_fcp_lock_pkt(fsp))
1351 goto out;
1353 fsp->recov_retry = 0;
1354 opcode = fc_frame_payload_op(fp);
1355 if (opcode == ELS_LS_RJT) {
1356 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1357 switch (rjt->er_reason) {
1358 default:
1359 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1360 "reason %d expl %d\n",
1361 fsp->rport->port_id, rjt->er_reason,
1362 rjt->er_explan);
1363 /* fall through */
1364 case ELS_RJT_UNSUP:
1365 FC_FCP_DBG(fsp, "device does not support REC\n");
1366 rp = fsp->rport->dd_data;
1368 * if we do not spport RECs or got some bogus
1369 * reason then resetup timer so we check for
1370 * making progress.
1372 rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1373 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1374 break;
1375 case ELS_RJT_LOGIC:
1376 case ELS_RJT_UNAB:
1378 * If no data transfer, the command frame got dropped
1379 * so we just retry. If data was transferred, we
1380 * lost the response but the target has no record,
1381 * so we abort and retry.
1383 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1384 fsp->xfer_len == 0) {
1385 fc_fcp_retry_cmd(fsp);
1386 break;
1388 fc_timeout_error(fsp);
1389 break;
1391 } else if (opcode == ELS_LS_ACC) {
1392 if (fsp->state & FC_SRB_ABORTED)
1393 goto unlock_out;
1395 data_dir = fsp->cmd->sc_data_direction;
1396 recp = fc_frame_payload_get(fp, sizeof(*recp));
1397 offset = ntohl(recp->reca_fc4value);
1398 e_stat = ntohl(recp->reca_e_stat);
1400 if (e_stat & ESB_ST_COMPLETE) {
1403 * The exchange is complete.
1405 * For output, we must've lost the response.
1406 * For input, all data must've been sent.
1407 * We lost may have lost the response
1408 * (and a confirmation was requested) and maybe
1409 * some data.
1411 * If all data received, send SRR
1412 * asking for response. If partial data received,
1413 * or gaps, SRR requests data at start of gap.
1414 * Recovery via SRR relies on in-order-delivery.
1416 if (data_dir == DMA_TO_DEVICE) {
1417 r_ctl = FC_RCTL_DD_CMD_STATUS;
1418 } else if (fsp->xfer_contig_end == offset) {
1419 r_ctl = FC_RCTL_DD_CMD_STATUS;
1420 } else {
1421 offset = fsp->xfer_contig_end;
1422 r_ctl = FC_RCTL_DD_SOL_DATA;
1424 fc_fcp_srr(fsp, r_ctl, offset);
1425 } else if (e_stat & ESB_ST_SEQ_INIT) {
1428 * The remote port has the initiative, so just
1429 * keep waiting for it to complete.
1431 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1432 } else {
1435 * The exchange is incomplete, we have seq. initiative.
1436 * Lost response with requested confirmation,
1437 * lost confirmation, lost transfer ready or
1438 * lost write data.
1440 * For output, if not all data was received, ask
1441 * for transfer ready to be repeated.
1443 * If we received or sent all the data, send SRR to
1444 * request response.
1446 * If we lost a response, we may have lost some read
1447 * data as well.
1449 r_ctl = FC_RCTL_DD_SOL_DATA;
1450 if (data_dir == DMA_TO_DEVICE) {
1451 r_ctl = FC_RCTL_DD_CMD_STATUS;
1452 if (offset < fsp->data_len)
1453 r_ctl = FC_RCTL_DD_DATA_DESC;
1454 } else if (offset == fsp->xfer_contig_end) {
1455 r_ctl = FC_RCTL_DD_CMD_STATUS;
1456 } else if (fsp->xfer_contig_end < offset) {
1457 offset = fsp->xfer_contig_end;
1459 fc_fcp_srr(fsp, r_ctl, offset);
1462 unlock_out:
1463 fc_fcp_unlock_pkt(fsp);
1464 out:
1465 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1466 fc_frame_free(fp);
1470 * Handle error response or timeout for REC exchange.
1472 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1474 int error = PTR_ERR(fp);
1476 if (fc_fcp_lock_pkt(fsp))
1477 goto out;
1479 switch (error) {
1480 case -FC_EX_CLOSED:
1481 fc_fcp_retry_cmd(fsp);
1482 break;
1484 default:
1485 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
1486 fsp, fsp->rport->port_id, error);
1487 fsp->status_code = FC_CMD_PLOGO;
1488 /* fall through */
1490 case -FC_EX_TIMEOUT:
1492 * Assume REC or LS_ACC was lost.
1493 * The exchange manager will have aborted REC, so retry.
1495 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n",
1496 fsp->rport->port_id, error, fsp->recov_retry,
1497 FC_MAX_RECOV_RETRY);
1498 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1499 fc_fcp_rec(fsp);
1500 else
1501 fc_timeout_error(fsp);
1502 break;
1504 fc_fcp_unlock_pkt(fsp);
1505 out:
1506 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1510 * Time out error routine:
1511 * abort's the I/O close the exchange and
1512 * send completion notification to scsi layer
1514 static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1516 fsp->status_code = FC_CMD_TIME_OUT;
1517 fsp->cdb_status = 0;
1518 fsp->io_status = 0;
1520 * if this fails then we let the scsi command timer fire and
1521 * scsi-ml escalate.
1523 fc_fcp_send_abort(fsp);
1527 * Sequence retransmission request.
1528 * This is called after receiving status but insufficient data, or
1529 * when expecting status but the request has timed out.
1531 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1533 struct fc_lport *lp = fsp->lp;
1534 struct fc_rport *rport;
1535 struct fc_rport_libfc_priv *rp;
1536 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1537 struct fc_seq *seq;
1538 struct fcp_srr *srr;
1539 struct fc_frame *fp;
1540 u8 cdb_op;
1542 rport = fsp->rport;
1543 rp = rport->dd_data;
1544 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1546 if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
1547 goto retry; /* shouldn't happen */
1548 fp = fc_frame_alloc(lp, sizeof(*srr));
1549 if (!fp)
1550 goto retry;
1552 srr = fc_frame_payload_get(fp, sizeof(*srr));
1553 memset(srr, 0, sizeof(*srr));
1554 srr->srr_op = ELS_SRR;
1555 srr->srr_ox_id = htons(ep->oxid);
1556 srr->srr_rx_id = htons(ep->rxid);
1557 srr->srr_r_ctl = r_ctl;
1558 srr->srr_rel_off = htonl(offset);
1560 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1561 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1562 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1564 seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL,
1565 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1566 if (!seq)
1567 goto retry;
1569 fsp->recov_seq = seq;
1570 fsp->xfer_len = offset;
1571 fsp->xfer_contig_end = offset;
1572 fsp->state &= ~FC_SRB_RCV_STATUS;
1573 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1574 return;
1575 retry:
1576 fc_fcp_retry_cmd(fsp);
1580 * Handle response from SRR.
1582 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1584 struct fc_fcp_pkt *fsp = arg;
1585 struct fc_frame_header *fh;
1587 if (IS_ERR(fp)) {
1588 fc_fcp_srr_error(fsp, fp);
1589 return;
1592 if (fc_fcp_lock_pkt(fsp))
1593 goto out;
1595 fh = fc_frame_header_get(fp);
1597 * BUG? fc_fcp_srr_error calls exch_done which would release
1598 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1599 * then fc_exch_timeout would be sending an abort. The exch_done
1600 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1601 * an abort response though.
1603 if (fh->fh_type == FC_TYPE_BLS) {
1604 fc_fcp_unlock_pkt(fsp);
1605 return;
1608 fsp->recov_seq = NULL;
1609 switch (fc_frame_payload_op(fp)) {
1610 case ELS_LS_ACC:
1611 fsp->recov_retry = 0;
1612 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1613 break;
1614 case ELS_LS_RJT:
1615 default:
1616 fc_timeout_error(fsp);
1617 break;
1619 fc_fcp_unlock_pkt(fsp);
1620 fsp->lp->tt.exch_done(seq);
1621 out:
1622 fc_frame_free(fp);
1623 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1626 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1628 if (fc_fcp_lock_pkt(fsp))
1629 goto out;
1630 fsp->lp->tt.exch_done(fsp->recov_seq);
1631 fsp->recov_seq = NULL;
1632 switch (PTR_ERR(fp)) {
1633 case -FC_EX_TIMEOUT:
1634 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1635 fc_fcp_rec(fsp);
1636 else
1637 fc_timeout_error(fsp);
1638 break;
1639 case -FC_EX_CLOSED: /* e.g., link failure */
1640 /* fall through */
1641 default:
1642 fc_fcp_retry_cmd(fsp);
1643 break;
1645 fc_fcp_unlock_pkt(fsp);
1646 out:
1647 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1650 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
1652 /* lock ? */
1653 return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull;
1657 * fc_queuecommand - The queuecommand function of the scsi template
1658 * @cmd: struct scsi_cmnd to be executed
1659 * @done: Callback function to be called when cmd is completed
1661 * this is the i/o strategy routine, called by the scsi layer
1662 * this routine is called with holding the host_lock.
1664 int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1666 struct fc_lport *lp;
1667 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1668 struct fc_fcp_pkt *fsp;
1669 struct fc_rport_libfc_priv *rp;
1670 int rval;
1671 int rc = 0;
1672 struct fcoe_dev_stats *stats;
1674 lp = shost_priv(sc_cmd->device->host);
1676 rval = fc_remote_port_chkready(rport);
1677 if (rval) {
1678 sc_cmd->result = rval;
1679 done(sc_cmd);
1680 goto out;
1683 if (!*(struct fc_remote_port **)rport->dd_data) {
1685 * rport is transitioning from blocked/deleted to
1686 * online
1688 sc_cmd->result = DID_IMM_RETRY << 16;
1689 done(sc_cmd);
1690 goto out;
1693 rp = rport->dd_data;
1695 if (!fc_fcp_lport_queue_ready(lp)) {
1696 rc = SCSI_MLQUEUE_HOST_BUSY;
1697 goto out;
1700 fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
1701 if (fsp == NULL) {
1702 rc = SCSI_MLQUEUE_HOST_BUSY;
1703 goto out;
1707 * build the libfc request pkt
1709 fsp->cmd = sc_cmd; /* save the cmd */
1710 fsp->lp = lp; /* save the softc ptr */
1711 fsp->rport = rport; /* set the remote port ptr */
1712 fsp->xfer_ddp = FC_XID_UNKNOWN;
1713 sc_cmd->scsi_done = done;
1716 * set up the transfer length
1718 fsp->data_len = scsi_bufflen(sc_cmd);
1719 fsp->xfer_len = 0;
1722 * setup the data direction
1724 stats = fc_lport_get_stats(lp);
1725 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1726 fsp->req_flags = FC_SRB_READ;
1727 stats->InputRequests++;
1728 stats->InputMegabytes = fsp->data_len;
1729 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1730 fsp->req_flags = FC_SRB_WRITE;
1731 stats->OutputRequests++;
1732 stats->OutputMegabytes = fsp->data_len;
1733 } else {
1734 fsp->req_flags = 0;
1735 stats->ControlRequests++;
1738 fsp->tgt_flags = rp->flags;
1740 init_timer(&fsp->timer);
1741 fsp->timer.data = (unsigned long)fsp;
1744 * send it to the lower layer
1745 * if we get -1 return then put the request in the pending
1746 * queue.
1748 rval = fc_fcp_pkt_send(lp, fsp);
1749 if (rval != 0) {
1750 fsp->state = FC_SRB_FREE;
1751 fc_fcp_pkt_release(fsp);
1752 rc = SCSI_MLQUEUE_HOST_BUSY;
1754 out:
1755 return rc;
1757 EXPORT_SYMBOL(fc_queuecommand);
1760 * fc_io_compl() - Handle responses for completed commands
1761 * @fsp: scsi packet
1763 * Translates a error to a Linux SCSI error.
1765 * The fcp packet lock must be held when calling.
1767 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1769 struct fc_fcp_internal *si;
1770 struct scsi_cmnd *sc_cmd;
1771 struct fc_lport *lp;
1772 unsigned long flags;
1774 /* release outstanding ddp context */
1775 fc_fcp_ddp_done(fsp);
1777 fsp->state |= FC_SRB_COMPL;
1778 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1779 spin_unlock_bh(&fsp->scsi_pkt_lock);
1780 del_timer_sync(&fsp->timer);
1781 spin_lock_bh(&fsp->scsi_pkt_lock);
1784 lp = fsp->lp;
1785 si = fc_get_scsi_internal(lp);
1786 spin_lock_irqsave(lp->host->host_lock, flags);
1787 if (!fsp->cmd) {
1788 spin_unlock_irqrestore(lp->host->host_lock, flags);
1789 return;
1793 * if a command timed out while we had to try and throttle IO
1794 * and it is now getting cleaned up, then we are about to
1795 * try again so clear the throttled flag incase we get more
1796 * time outs.
1798 if (si->throttled && fsp->state & FC_SRB_NOMEM)
1799 si->throttled = 0;
1801 sc_cmd = fsp->cmd;
1802 fsp->cmd = NULL;
1804 if (!sc_cmd->SCp.ptr) {
1805 spin_unlock_irqrestore(lp->host->host_lock, flags);
1806 return;
1809 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1810 switch (fsp->status_code) {
1811 case FC_COMPLETE:
1812 if (fsp->cdb_status == 0) {
1814 * good I/O status
1816 sc_cmd->result = DID_OK << 16;
1817 if (fsp->scsi_resid)
1818 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1819 } else if (fsp->cdb_status == QUEUE_FULL) {
1820 struct scsi_device *tmp_sdev;
1821 struct scsi_device *sdev = sc_cmd->device;
1823 shost_for_each_device(tmp_sdev, sdev->host) {
1824 if (tmp_sdev->id != sdev->id)
1825 continue;
1827 if (tmp_sdev->queue_depth > 1) {
1828 scsi_track_queue_full(tmp_sdev,
1829 tmp_sdev->
1830 queue_depth - 1);
1833 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1834 } else {
1836 * transport level I/O was ok but scsi
1837 * has non zero status
1839 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1841 break;
1842 case FC_ERROR:
1843 sc_cmd->result = DID_ERROR << 16;
1844 break;
1845 case FC_DATA_UNDRUN:
1846 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1848 * scsi status is good but transport level
1849 * underrun.
1851 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ?
1852 DID_OK : DID_ERROR) << 16;
1853 } else {
1855 * scsi got underrun, this is an error
1857 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1858 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1860 break;
1861 case FC_DATA_OVRRUN:
1863 * overrun is an error
1865 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1866 break;
1867 case FC_CMD_ABORTED:
1868 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1869 break;
1870 case FC_CMD_TIME_OUT:
1871 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1872 break;
1873 case FC_CMD_RESET:
1874 sc_cmd->result = (DID_RESET << 16);
1875 break;
1876 case FC_HRD_ERROR:
1877 sc_cmd->result = (DID_NO_CONNECT << 16);
1878 break;
1879 default:
1880 sc_cmd->result = (DID_ERROR << 16);
1881 break;
1884 list_del(&fsp->list);
1885 sc_cmd->SCp.ptr = NULL;
1886 sc_cmd->scsi_done(sc_cmd);
1887 spin_unlock_irqrestore(lp->host->host_lock, flags);
1889 /* release ref from initial allocation in queue command */
1890 fc_fcp_pkt_release(fsp);
1894 * fc_fcp_complete() - complete processing of a fcp packet
1895 * @fsp: fcp packet
1897 * This function may sleep if a fsp timer is pending.
1898 * The host lock must not be held by caller.
1900 void fc_fcp_complete(struct fc_fcp_pkt *fsp)
1902 if (fc_fcp_lock_pkt(fsp))
1903 return;
1905 fc_fcp_complete_locked(fsp);
1906 fc_fcp_unlock_pkt(fsp);
1908 EXPORT_SYMBOL(fc_fcp_complete);
1911 * fc_eh_abort() - Abort a command
1912 * @sc_cmd: scsi command to abort
1914 * From scsi host template.
1915 * send ABTS to the target device and wait for the response
1916 * sc_cmd is the pointer to the command to be aborted.
1918 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1920 struct fc_fcp_pkt *fsp;
1921 struct fc_lport *lp;
1922 int rc = FAILED;
1923 unsigned long flags;
1925 lp = shost_priv(sc_cmd->device->host);
1926 if (lp->state != LPORT_ST_READY)
1927 return rc;
1928 else if (!lp->link_up)
1929 return rc;
1931 spin_lock_irqsave(lp->host->host_lock, flags);
1932 fsp = CMD_SP(sc_cmd);
1933 if (!fsp) {
1934 /* command completed while scsi eh was setting up */
1935 spin_unlock_irqrestore(lp->host->host_lock, flags);
1936 return SUCCESS;
1938 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1939 fc_fcp_pkt_hold(fsp);
1940 spin_unlock_irqrestore(lp->host->host_lock, flags);
1942 if (fc_fcp_lock_pkt(fsp)) {
1943 /* completed while we were waiting for timer to be deleted */
1944 rc = SUCCESS;
1945 goto release_pkt;
1948 rc = fc_fcp_pkt_abort(lp, fsp);
1949 fc_fcp_unlock_pkt(fsp);
1951 release_pkt:
1952 fc_fcp_pkt_release(fsp);
1953 return rc;
1955 EXPORT_SYMBOL(fc_eh_abort);
1958 * fc_eh_device_reset() Reset a single LUN
1959 * @sc_cmd: scsi command
1961 * Set from scsi host template to send tm cmd to the target and wait for the
1962 * response.
1964 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1966 struct fc_lport *lp;
1967 struct fc_fcp_pkt *fsp;
1968 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1969 int rc = FAILED;
1970 struct fc_rport_libfc_priv *rp;
1971 int rval;
1973 rval = fc_remote_port_chkready(rport);
1974 if (rval)
1975 goto out;
1977 rp = rport->dd_data;
1978 lp = shost_priv(sc_cmd->device->host);
1980 if (lp->state != LPORT_ST_READY)
1981 return rc;
1983 FC_SCSI_DBG(lp, "Resetting rport (%6x)\n", rport->port_id);
1985 fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
1986 if (fsp == NULL) {
1987 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
1988 sc_cmd->result = DID_NO_CONNECT << 16;
1989 goto out;
1993 * Build the libfc request pkt. Do not set the scsi cmnd, because
1994 * the sc passed in is not setup for execution like when sent
1995 * through the queuecommand callout.
1997 fsp->lp = lp; /* save the softc ptr */
1998 fsp->rport = rport; /* set the remote port ptr */
2001 * flush outstanding commands
2003 rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2004 fsp->state = FC_SRB_FREE;
2005 fc_fcp_pkt_release(fsp);
2007 out:
2008 return rc;
2010 EXPORT_SYMBOL(fc_eh_device_reset);
2013 * fc_eh_host_reset() - The reset function will reset the ports on the host.
2014 * @sc_cmd: scsi command
2016 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2018 struct Scsi_Host *shost = sc_cmd->device->host;
2019 struct fc_lport *lp = shost_priv(shost);
2020 unsigned long wait_tmo;
2022 FC_SCSI_DBG(lp, "Resetting host\n");
2024 lp->tt.lport_reset(lp);
2025 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2026 while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
2027 msleep(1000);
2029 if (fc_fcp_lport_queue_ready(lp)) {
2030 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2031 "on port (%6x)\n", fc_host_port_id(lp->host));
2032 return SUCCESS;
2033 } else {
2034 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2035 "port (%6x) is not ready.\n",
2036 fc_host_port_id(lp->host));
2037 return FAILED;
2040 EXPORT_SYMBOL(fc_eh_host_reset);
2043 * fc_slave_alloc() - configure queue depth
2044 * @sdev: scsi device
2046 * Configures queue depth based on host's cmd_per_len. If not set
2047 * then we use the libfc default.
2049 int fc_slave_alloc(struct scsi_device *sdev)
2051 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2053 if (!rport || fc_remote_port_chkready(rport))
2054 return -ENXIO;
2056 if (sdev->tagged_supported)
2057 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2058 else
2059 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2060 FC_FCP_DFLT_QUEUE_DEPTH);
2062 return 0;
2064 EXPORT_SYMBOL(fc_slave_alloc);
2066 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2068 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2069 return sdev->queue_depth;
2071 EXPORT_SYMBOL(fc_change_queue_depth);
2073 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2075 if (sdev->tagged_supported) {
2076 scsi_set_tag_type(sdev, tag_type);
2077 if (tag_type)
2078 scsi_activate_tcq(sdev, sdev->queue_depth);
2079 else
2080 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2081 } else
2082 tag_type = 0;
2084 return tag_type;
2086 EXPORT_SYMBOL(fc_change_queue_type);
2088 void fc_fcp_destroy(struct fc_lport *lp)
2090 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
2092 if (!list_empty(&si->scsi_pkt_queue))
2093 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2094 "port (%6x)\n", fc_host_port_id(lp->host));
2096 mempool_destroy(si->scsi_pkt_pool);
2097 kfree(si);
2098 lp->scsi_priv = NULL;
2100 EXPORT_SYMBOL(fc_fcp_destroy);
2102 int fc_fcp_init(struct fc_lport *lp)
2104 int rc;
2105 struct fc_fcp_internal *si;
2107 if (!lp->tt.fcp_cmd_send)
2108 lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
2110 if (!lp->tt.fcp_cleanup)
2111 lp->tt.fcp_cleanup = fc_fcp_cleanup;
2113 if (!lp->tt.fcp_abort_io)
2114 lp->tt.fcp_abort_io = fc_fcp_abort_io;
2116 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2117 if (!si)
2118 return -ENOMEM;
2119 lp->scsi_priv = si;
2120 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2122 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2123 if (!si->scsi_pkt_pool) {
2124 rc = -ENOMEM;
2125 goto free_internal;
2127 return 0;
2129 free_internal:
2130 kfree(si);
2131 return rc;
2133 EXPORT_SYMBOL(fc_fcp_init);
2135 static int __init libfc_init(void)
2137 int rc;
2139 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2140 sizeof(struct fc_fcp_pkt),
2141 0, SLAB_HWCACHE_ALIGN, NULL);
2142 if (scsi_pkt_cachep == NULL) {
2143 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2144 "module load failed!");
2145 return -ENOMEM;
2148 rc = fc_setup_exch_mgr();
2149 if (rc)
2150 goto destroy_pkt_cache;
2152 rc = fc_setup_rport();
2153 if (rc)
2154 goto destroy_em;
2156 return rc;
2157 destroy_em:
2158 fc_destroy_exch_mgr();
2159 destroy_pkt_cache:
2160 kmem_cache_destroy(scsi_pkt_cachep);
2161 return rc;
2164 static void __exit libfc_exit(void)
2166 kmem_cache_destroy(scsi_pkt_cachep);
2167 fc_destroy_exch_mgr();
2168 fc_destroy_rport();
2171 module_init(libfc_init);
2172 module_exit(libfc_exit);