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[SCSI] fcoe, libfc: check offload features from LLD through netdev
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / libfc / fc_fcp.c
CommitLineData
42e9a92f
RL		 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
5 *
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.
9 *
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.
14 *
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.
18 *
19 * Maintained at www.Open-FCoE.org
20 */
21
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
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>
36
37#include <scsi/fc/fc_fc2.h>
38
39#include <scsi/libfc.h>
40#include <scsi/fc_encode.h>
41
42MODULE_AUTHOR("Open-FCoE.org");
43MODULE_DESCRIPTION("libfc");
44MODULE_LICENSE("GPL");
45
46static int fc_fcp_debug;
47
48#define FC_DEBUG_FCP(fmt...) \
49 do { \
50 if (fc_fcp_debug) \
51 FC_DBG(fmt); \
52 } while (0)
53
54static struct kmem_cache *scsi_pkt_cachep;
55
56/* SRB state definitions */
57#define FC_SRB_FREE 0 /* cmd is free */
58#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
59#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
60#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
61#define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */
62#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
63#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
64#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
65#define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */
66
67#define FC_SRB_READ (1 << 1)
68#define FC_SRB_WRITE (1 << 0)
69
70/*
71 * The SCp.ptr should be tested and set under the host lock. NULL indicates
72 * that the command has been retruned to the scsi layer.
73 */
74#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
75#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
76#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
77#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
78#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
79
80struct fc_fcp_internal {
81 mempool_t *scsi_pkt_pool;
82 struct list_head scsi_pkt_queue;
83 u8 throttled;
84};
85
86#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
87
88/*
89 * function prototypes
90 * FC scsi I/O related functions
91 */
92static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
93static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
94static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
95static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
96static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
97static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp);
98static void fc_timeout_error(struct fc_fcp_pkt *);
99static void fc_fcp_timeout(unsigned long data);
100static void fc_fcp_rec(struct fc_fcp_pkt *);
101static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
102static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
103static void fc_io_compl(struct fc_fcp_pkt *);
104
105static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
106static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
107static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
108
109/*
110 * command status codes
111 */
112#define FC_COMPLETE 0
113#define FC_CMD_ABORTED 1
114#define FC_CMD_RESET 2
115#define FC_CMD_PLOGO 3
116#define FC_SNS_RCV 4
117#define FC_TRANS_ERR 5
118#define FC_DATA_OVRRUN 6
119#define FC_DATA_UNDRUN 7
120#define FC_ERROR 8
121#define FC_HRD_ERROR 9
122#define FC_CMD_TIME_OUT 10
123
124/*
125 * Error recovery timeout values.
126 */
127#define FC_SCSI_ER_TIMEOUT (10 * HZ)
128#define FC_SCSI_TM_TOV (10 * HZ)
129#define FC_SCSI_REC_TOV (2 * HZ)
130#define FC_HOST_RESET_TIMEOUT (30 * HZ)
131
132#define FC_MAX_ERROR_CNT 5
133#define FC_MAX_RECOV_RETRY 3
134
135#define FC_FCP_DFLT_QUEUE_DEPTH 32
136
137/**
138 * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet
139 * @lp: fc lport struct
140 * @gfp: gfp flags for allocation
141 *
142 * This is used by upper layer scsi driver.
143 * Return Value : scsi_pkt structure or null on allocation failure.
144 * Context : call from process context. no locking required.
145 */
146static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp)
147{
148 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
149 struct fc_fcp_pkt *fsp;
150
151 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
152 if (fsp) {
153 memset(fsp, 0, sizeof(*fsp));
154 fsp->lp = lp;
155 atomic_set(&fsp->ref_cnt, 1);
156 init_timer(&fsp->timer);
157 INIT_LIST_HEAD(&fsp->list);
158 spin_lock_init(&fsp->scsi_pkt_lock);
159 }
160 return fsp;
161}
162
163/**
34f42a07 164 * fc_fcp_pkt_release() - release hold on scsi_pkt packet
42e9a92f
RL		 165 * @fsp: fcp packet struct
166 *
167 * This is used by upper layer scsi driver.
168 * Context : call from process and interrupt context.
169 * no locking required
170 */
171static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
172{
173 if (atomic_dec_and_test(&fsp->ref_cnt)) {
174 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
175
176 mempool_free(fsp, si->scsi_pkt_pool);
177 }
178}
179
180static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
181{
182 atomic_inc(&fsp->ref_cnt);
183}
184
185/**
34f42a07 186 * fc_fcp_pkt_destory() - release hold on scsi_pkt packet
42e9a92f
RL		 187 * @seq: exchange sequence
188 * @fsp: fcp packet struct
189 *
190 * Release hold on scsi_pkt packet set to keep scsi_pkt
191 * till EM layer exch resource is not freed.
192 * Context : called from from EM layer.
193 * no locking required
194 */
195static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
196{
197 fc_fcp_pkt_release(fsp);
198}
199
200/**
34f42a07 201 * fc_fcp_lock_pkt() - lock a packet and get a ref to it.
42e9a92f
RL		 202 * @fsp: fcp packet
203 *
204 * We should only return error if we return a command to scsi-ml before
205 * getting a response. This can happen in cases where we send a abort, but
206 * do not wait for the response and the abort and command can be passing
207 * each other on the wire/network-layer.
208 *
209 * Note: this function locks the packet and gets a reference to allow
210 * callers to call the completion function while the lock is held and
211 * not have to worry about the packets refcount.
212 *
213 * TODO: Maybe we should just have callers grab/release the lock and
214 * have a function that they call to verify the fsp and grab a ref if
215 * needed.
216 */
217static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
218{
219 spin_lock_bh(&fsp->scsi_pkt_lock);
220 if (fsp->state & FC_SRB_COMPL) {
221 spin_unlock_bh(&fsp->scsi_pkt_lock);
222 return -EPERM;
223 }
224
225 fc_fcp_pkt_hold(fsp);
226 return 0;
227}
228
229static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
230{
231 spin_unlock_bh(&fsp->scsi_pkt_lock);
232 fc_fcp_pkt_release(fsp);
233}
234
235static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
236{
237 if (!(fsp->state & FC_SRB_COMPL))
238 mod_timer(&fsp->timer, jiffies + delay);
239}
240
241static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
242{
243 if (!fsp->seq_ptr)
244 return -EINVAL;
245
246 fsp->state |= FC_SRB_ABORT_PENDING;
247 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
248}
249
250/*
251 * Retry command.
252 * An abort isn't needed.
253 */
254static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
255{
256 if (fsp->seq_ptr) {
257 fsp->lp->tt.exch_done(fsp->seq_ptr);
258 fsp->seq_ptr = NULL;
259 }
260
261 fsp->state &= ~FC_SRB_ABORT_PENDING;
1c9fbafc 262 fsp->io_status = 0;
42e9a92f
RL		 263 fsp->status_code = FC_ERROR;
264 fc_fcp_complete_locked(fsp);
265}
266
267/*
268 * Receive SCSI data from target.
269 * Called after receiving solicited data.
270 */
271static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
272{
273 struct scsi_cmnd *sc = fsp->cmd;
274 struct fc_lport *lp = fsp->lp;
275 struct fcoe_dev_stats *stats;
276 struct fc_frame_header *fh;
277 size_t start_offset;
278 size_t offset;
279 u32 crc;
280 u32 copy_len = 0;
281 size_t len;
282 void *buf;
283 struct scatterlist *sg;
284 size_t remaining;
285
286 fh = fc_frame_header_get(fp);
287 offset = ntohl(fh->fh_parm_offset);
288 start_offset = offset;
289 len = fr_len(fp) - sizeof(*fh);
290 buf = fc_frame_payload_get(fp, 0);
291
292 if (offset + len > fsp->data_len) {
34f42a07 293 /* this should never happen */
42e9a92f
RL		 294 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
295 fc_frame_crc_check(fp))
296 goto crc_err;
297 FC_DEBUG_FCP("data received past end. len %zx offset %zx "
298 "data_len %x\n", len, offset, fsp->data_len);
299 fc_fcp_retry_cmd(fsp);
300 return;
301 }
302 if (offset != fsp->xfer_len)
303 fsp->state |= FC_SRB_DISCONTIG;
304
305 crc = 0;
306 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
307 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
308
309 sg = scsi_sglist(sc);
310 remaining = len;
311
312 while (remaining > 0 && sg) {
313 size_t off;
314 void *page_addr;
315 size_t sg_bytes;
316
317 if (offset >= sg->length) {
318 offset -= sg->length;
319 sg = sg_next(sg);
320 continue;
321 }
322 sg_bytes = min(remaining, sg->length - offset);
323
324 /*
325 * The scatterlist item may be bigger than PAGE_SIZE,
326 * but we are limited to mapping PAGE_SIZE at a time.
327 */
328 off = offset + sg->offset;
329 sg_bytes = min(sg_bytes, (size_t)
330 (PAGE_SIZE - (off & ~PAGE_MASK)));
331 page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
332 KM_SOFTIRQ0);
333 if (!page_addr)
334 break; /* XXX panic? */
335
336 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
337 crc = crc32(crc, buf, sg_bytes);
338 memcpy((char *)page_addr + (off & ~PAGE_MASK), buf,
339 sg_bytes);
340
341 kunmap_atomic(page_addr, KM_SOFTIRQ0);
342 buf += sg_bytes;
343 offset += sg_bytes;
344 remaining -= sg_bytes;
345 copy_len += sg_bytes;
346 }
347
348 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
349 buf = fc_frame_payload_get(fp, 0);
350 if (len % 4) {
351 crc = crc32(crc, buf + len, 4 - (len % 4));
352 len += 4 - (len % 4);
353 }
354
355 if (~crc != le32_to_cpu(fr_crc(fp))) {
356crc_err:
357 stats = lp->dev_stats[smp_processor_id()];
358 stats->ErrorFrames++;
359 if (stats->InvalidCRCCount++ < 5)
360 FC_DBG("CRC error on data frame\n");
361 /*
362 * Assume the frame is total garbage.
363 * We may have copied it over the good part
364 * of the buffer.
365 * If so, we need to retry the entire operation.
366 * Otherwise, ignore it.
367 */
368 if (fsp->state & FC_SRB_DISCONTIG)
369 fc_fcp_retry_cmd(fsp);
370 return;
371 }
372 }
373
374 if (fsp->xfer_contig_end == start_offset)
375 fsp->xfer_contig_end += copy_len;
376 fsp->xfer_len += copy_len;
377
378 /*
379 * In the very rare event that this data arrived after the response
380 * and completes the transfer, call the completion handler.
381 */
382 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
383 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
384 fc_fcp_complete_locked(fsp);
385}
386
34f42a07
RL		 387/**
388 * fc_fcp_send_data() - Send SCSI data to target.
42e9a92f
RL		 389 * @fsp: ptr to fc_fcp_pkt
390 * @sp: ptr to this sequence
391 * @offset: starting offset for this data request
392 * @seq_blen: the burst length for this data request
393 *
394 * Called after receiving a Transfer Ready data descriptor.
395 * if LLD is capable of seq offload then send down seq_blen
396 * size of data in single frame, otherwise send multiple FC
397 * frames of max FC frame payload supported by target port.
398 *
399 * Returns : 0 for success.
400 */
401static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
402 size_t offset, size_t seq_blen)
403{
404 struct fc_exch *ep;
405 struct scsi_cmnd *sc;
406 struct scatterlist *sg;
407 struct fc_frame *fp = NULL;
408 struct fc_lport *lp = fsp->lp;
409 size_t remaining;
410 size_t t_blen;
411 size_t tlen;
412 size_t sg_bytes;
413 size_t frame_offset, fh_parm_offset;
414 int error;
415 void *data = NULL;
416 void *page_addr;
417 int using_sg = lp->sg_supp;
418 u32 f_ctl;
419
420 WARN_ON(seq_blen <= 0);
421 if (unlikely(offset + seq_blen > fsp->data_len)) {
422 /* this should never happen */
423 FC_DEBUG_FCP("xfer-ready past end. seq_blen %zx offset %zx\n",
424 seq_blen, offset);
425 fc_fcp_send_abort(fsp);
426 return 0;
427 } else if (offset != fsp->xfer_len) {
428 /* Out of Order Data Request - no problem, but unexpected. */
429 FC_DEBUG_FCP("xfer-ready non-contiguous. "
430 "seq_blen %zx offset %zx\n", seq_blen, offset);
431 }
432
433 /*
434 * if LLD is capable of seq_offload then set transport
435 * burst length (t_blen) to seq_blen, otherwise set t_blen
436 * to max FC frame payload previously set in fsp->max_payload.
437 */
438 t_blen = lp->seq_offload ? seq_blen : fsp->max_payload;
439 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
440 if (t_blen > 512)
441 t_blen &= ~(512 - 1); /* round down to block size */
442 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
443 sc = fsp->cmd;
444
445 remaining = seq_blen;
446 fh_parm_offset = frame_offset = offset;
447 tlen = 0;
448 seq = lp->tt.seq_start_next(seq);
449 f_ctl = FC_FC_REL_OFF;
450 WARN_ON(!seq);
451
452 /*
453 * If a get_page()/put_page() will fail, don't use sg lists
454 * in the fc_frame structure.
455 *
456 * The put_page() may be long after the I/O has completed
457 * in the case of FCoE, since the network driver does it
458 * via free_skb(). See the test in free_pages_check().
459 *
460 * Test this case with 'dd </dev/zero >/dev/st0 bs=64k'.
461 */
462 if (using_sg) {
463 for (sg = scsi_sglist(sc); sg; sg = sg_next(sg)) {
464 if (page_count(sg_page(sg)) == 0 ||
465 (sg_page(sg)->flags & (1 << PG_lru |
466 1 << PG_private |
467 1 << PG_locked |
468 1 << PG_active |
469 1 << PG_slab |
470 1 << PG_swapcache |
471 1 << PG_writeback |
472 1 << PG_reserved |
473 1 << PG_buddy))) {
474 using_sg = 0;
475 break;
476 }
477 }
478 }
479 sg = scsi_sglist(sc);
480
481 while (remaining > 0 && sg) {
482 if (offset >= sg->length) {
483 offset -= sg->length;
484 sg = sg_next(sg);
485 continue;
486 }
487 if (!fp) {
488 tlen = min(t_blen, remaining);
489
490 /*
491 * TODO. Temporary workaround. fc_seq_send() can't
492 * handle odd lengths in non-linear skbs.
493 * This will be the final fragment only.
494 */
495 if (tlen % 4)
496 using_sg = 0;
497 if (using_sg) {
498 fp = _fc_frame_alloc(lp, 0);
499 if (!fp)
500 return -ENOMEM;
501 } else {
502 fp = fc_frame_alloc(lp, tlen);
503 if (!fp)
504 return -ENOMEM;
505
506 data = (void *)(fr_hdr(fp)) +
507 sizeof(struct fc_frame_header);
508 }
509 fh_parm_offset = frame_offset;
510 fr_max_payload(fp) = fsp->max_payload;
511 }
512 sg_bytes = min(tlen, sg->length - offset);
513 if (using_sg) {
514 WARN_ON(skb_shinfo(fp_skb(fp))->nr_frags >
515 FC_FRAME_SG_LEN);
516 get_page(sg_page(sg));
517 skb_fill_page_desc(fp_skb(fp),
518 skb_shinfo(fp_skb(fp))->nr_frags,
519 sg_page(sg), sg->offset + offset,
520 sg_bytes);
521 fp_skb(fp)->data_len += sg_bytes;
522 fr_len(fp) += sg_bytes;
523 fp_skb(fp)->truesize += PAGE_SIZE;
524 } else {
525 size_t off = offset + sg->offset;
526
527 /*
528 * The scatterlist item may be bigger than PAGE_SIZE,
529 * but we must not cross pages inside the kmap.
530 */
531 sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE -
532 (off & ~PAGE_MASK)));
533 page_addr = kmap_atomic(sg_page(sg) +
534 (off >> PAGE_SHIFT),
535 KM_SOFTIRQ0);
536 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
537 sg_bytes);
538 kunmap_atomic(page_addr, KM_SOFTIRQ0);
539 data += sg_bytes;
540 }
541 offset += sg_bytes;
542 frame_offset += sg_bytes;
543 tlen -= sg_bytes;
544 remaining -= sg_bytes;
545
546 if (tlen)
547 continue;
548
549 /*
550 * Send sequence with transfer sequence initiative in case
551 * this is last FCP frame of the sequence.
552 */
553 if (remaining == 0)
554 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
555
556 ep = fc_seq_exch(seq);
557 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
558 FC_TYPE_FCP, f_ctl, fh_parm_offset);
559
560 /*
561 * send fragment using for a sequence.
562 */
563 error = lp->tt.seq_send(lp, seq, fp);
564 if (error) {
565 WARN_ON(1); /* send error should be rare */
566 fc_fcp_retry_cmd(fsp);
567 return 0;
568 }
569 fp = NULL;
570 }
571 fsp->xfer_len += seq_blen; /* premature count? */
572 return 0;
573}
574
575static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
576{
577 int ba_done = 1;
578 struct fc_ba_rjt *brp;
579 struct fc_frame_header *fh;
580
581 fh = fc_frame_header_get(fp);
582 switch (fh->fh_r_ctl) {
583 case FC_RCTL_BA_ACC:
584 break;
585 case FC_RCTL_BA_RJT:
586 brp = fc_frame_payload_get(fp, sizeof(*brp));
587 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
588 break;
589 /* fall thru */
590 default:
591 /*
592 * we will let the command timeout
593 * and scsi-ml recover in this case,
594 * therefore cleared the ba_done flag.
595 */
596 ba_done = 0;
597 }
598
599 if (ba_done) {
600 fsp->state |= FC_SRB_ABORTED;
601 fsp->state &= ~FC_SRB_ABORT_PENDING;
602
603 if (fsp->wait_for_comp)
604 complete(&fsp->tm_done);
605 else
606 fc_fcp_complete_locked(fsp);
607 }
608}
609
34f42a07
RL		 610/**
611 * fc_fcp_reduce_can_queue() - drop can_queue
42e9a92f
RL		 612 * @lp: lport to drop queueing for
613 *
614 * If we are getting memory allocation failures, then we may
615 * be trying to execute too many commands. We let the running
616 * commands complete or timeout, then try again with a reduced
617 * can_queue. Eventually we will hit the point where we run
618 * on all reserved structs.
619 */
620static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
621{
622 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
623 unsigned long flags;
624 int can_queue;
625
626 spin_lock_irqsave(lp->host->host_lock, flags);
627 if (si->throttled)
628 goto done;
629 si->throttled = 1;
630
631 can_queue = lp->host->can_queue;
632 can_queue >>= 1;
633 if (!can_queue)
634 can_queue = 1;
635 lp->host->can_queue = can_queue;
636 shost_printk(KERN_ERR, lp->host, "Could not allocate frame.\n"
637 "Reducing can_queue to %d.\n", can_queue);
638done:
639 spin_unlock_irqrestore(lp->host->host_lock, flags);
640}
641
34f42a07
RL		 642/**
643 * fc_fcp_recv() - Reveive FCP frames
644 * @seq: The sequence the frame is on
645 * @fp: The FC frame
646 * @arg: The related FCP packet
42e9a92f
RL		 647 *
648 * Return : None
649 * Context : called from Soft IRQ context
650 * can not called holding list lock
651 */
652static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
653{
654 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
655 struct fc_lport *lp;
656 struct fc_frame_header *fh;
657 struct fcp_txrdy *dd;
658 u8 r_ctl;
659 int rc = 0;
660
661 if (IS_ERR(fp))
662 goto errout;
663
664 fh = fc_frame_header_get(fp);
665 r_ctl = fh->fh_r_ctl;
666 lp = fsp->lp;
667
668 if (!(lp->state & LPORT_ST_READY))
669 goto out;
670 if (fc_fcp_lock_pkt(fsp))
671 goto out;
672 fsp->last_pkt_time = jiffies;
673
674 if (fh->fh_type == FC_TYPE_BLS) {
675 fc_fcp_abts_resp(fsp, fp);
676 goto unlock;
677 }
678
679 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
680 goto unlock;
681
682 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
683 /*
684 * received XFER RDY from the target
685 * need to send data to the target
686 */
687 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
688 dd = fc_frame_payload_get(fp, sizeof(*dd));
689 WARN_ON(!dd);
690
691 rc = fc_fcp_send_data(fsp, seq,
692 (size_t) ntohl(dd->ft_data_ro),
693 (size_t) ntohl(dd->ft_burst_len));
694 if (!rc)
695 seq->rec_data = fsp->xfer_len;
696 else if (rc == -ENOMEM)
697 fsp->state |= FC_SRB_NOMEM;
698 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
699 /*
700 * received a DATA frame
701 * next we will copy the data to the system buffer
702 */
703 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
704 fc_fcp_recv_data(fsp, fp);
705 seq->rec_data = fsp->xfer_contig_end;
706 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
707 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
708
709 fc_fcp_resp(fsp, fp);
710 } else {
711 FC_DBG("unexpected frame. r_ctl %x\n", r_ctl);
712 }
713unlock:
714 fc_fcp_unlock_pkt(fsp);
715out:
716 fc_frame_free(fp);
717errout:
718 if (IS_ERR(fp))
719 fc_fcp_error(fsp, fp);
720 else if (rc == -ENOMEM)
721 fc_fcp_reduce_can_queue(lp);
722}
723
724static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
725{
726 struct fc_frame_header *fh;
727 struct fcp_resp *fc_rp;
728 struct fcp_resp_ext *rp_ex;
729 struct fcp_resp_rsp_info *fc_rp_info;
730 u32 plen;
731 u32 expected_len;
732 u32 respl = 0;
733 u32 snsl = 0;
734 u8 flags = 0;
735
736 plen = fr_len(fp);
737 fh = (struct fc_frame_header *)fr_hdr(fp);
738 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
739 goto len_err;
740 plen -= sizeof(*fh);
741 fc_rp = (struct fcp_resp *)(fh + 1);
742 fsp->cdb_status = fc_rp->fr_status;
743 flags = fc_rp->fr_flags;
744 fsp->scsi_comp_flags = flags;
745 expected_len = fsp->data_len;
746
747 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
748 rp_ex = (void *)(fc_rp + 1);
749 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
750 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
751 goto len_err;
752 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
753 if (flags & FCP_RSP_LEN_VAL) {
754 respl = ntohl(rp_ex->fr_rsp_len);
755 if (respl != sizeof(*fc_rp_info))
756 goto len_err;
757 if (fsp->wait_for_comp) {
758 /* Abuse cdb_status for rsp code */
759 fsp->cdb_status = fc_rp_info->rsp_code;
760 complete(&fsp->tm_done);
761 /*
762 * tmfs will not have any scsi cmd so
763 * exit here
764 */
765 return;
766 } else
767 goto err;
768 }
769 if (flags & FCP_SNS_LEN_VAL) {
770 snsl = ntohl(rp_ex->fr_sns_len);
771 if (snsl > SCSI_SENSE_BUFFERSIZE)
772 snsl = SCSI_SENSE_BUFFERSIZE;
773 memcpy(fsp->cmd->sense_buffer,
774 (char *)fc_rp_info + respl, snsl);
775 }
776 }
777 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
778 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
779 goto len_err;
780 if (flags & FCP_RESID_UNDER) {
781 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
782 /*
783 * The cmnd->underflow is the minimum number of
784 * bytes that must be transfered for this
785 * command. Provided a sense condition is not
786 * present, make sure the actual amount
787 * transferred is at least the underflow value
788 * or fail.
789 */
790 if (!(flags & FCP_SNS_LEN_VAL) &&
791 (fc_rp->fr_status == 0) &&
792 (scsi_bufflen(fsp->cmd) -
793 fsp->scsi_resid) < fsp->cmd->underflow)
794 goto err;
795 expected_len -= fsp->scsi_resid;
796 } else {
797 fsp->status_code = FC_ERROR;
798 }
799 }
800 }
801 fsp->state |= FC_SRB_RCV_STATUS;
802
803 /*
804 * Check for missing or extra data frames.
805 */
806 if (unlikely(fsp->xfer_len != expected_len)) {
807 if (fsp->xfer_len < expected_len) {
808 /*
809 * Some data may be queued locally,
810 * Wait a at least one jiffy to see if it is delivered.
811 * If this expires without data, we may do SRR.
812 */
813 fc_fcp_timer_set(fsp, 2);
814 return;
815 }
816 fsp->status_code = FC_DATA_OVRRUN;
817 FC_DBG("tgt %6x xfer len %zx greater than expected len %x. "
818 "data len %x\n",
819 fsp->rport->port_id,
820 fsp->xfer_len, expected_len, fsp->data_len);
821 }
822 fc_fcp_complete_locked(fsp);
823 return;
824
825len_err:
826 FC_DBG("short FCP response. flags 0x%x len %u respl %u snsl %u\n",
827 flags, fr_len(fp), respl, snsl);
828err:
829 fsp->status_code = FC_ERROR;
830 fc_fcp_complete_locked(fsp);
831}
832
833/**
34f42a07 834 * fc_fcp_complete_locked() - complete processing of a fcp packet
42e9a92f
RL		 835 * @fsp: fcp packet
836 *
837 * This function may sleep if a timer is pending. The packet lock must be
838 * held, and the host lock must not be held.
839 */
840static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
841{
842 struct fc_lport *lp = fsp->lp;
843 struct fc_seq *seq;
844 struct fc_exch *ep;
845 u32 f_ctl;
846
847 if (fsp->state & FC_SRB_ABORT_PENDING)
848 return;
849
850 if (fsp->state & FC_SRB_ABORTED) {
851 if (!fsp->status_code)
852 fsp->status_code = FC_CMD_ABORTED;
853 } else {
854 /*
855 * Test for transport underrun, independent of response
856 * underrun status.
857 */
858 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
859 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
860 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
861 fsp->status_code = FC_DATA_UNDRUN;
1c9fbafc 862 fsp->io_status = 0;
42e9a92f
RL		 863 }
864 }
865
866 seq = fsp->seq_ptr;
867 if (seq) {
868 fsp->seq_ptr = NULL;
869 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
870 struct fc_frame *conf_frame;
871 struct fc_seq *csp;
872
873 csp = lp->tt.seq_start_next(seq);
874 conf_frame = fc_frame_alloc(fsp->lp, 0);
875 if (conf_frame) {
876 f_ctl = FC_FC_SEQ_INIT;
877 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
878 ep = fc_seq_exch(seq);
879 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
880 ep->did, ep->sid,
881 FC_TYPE_FCP, f_ctl, 0);
882 lp->tt.seq_send(lp, csp, conf_frame);
883 }
884 }
885 lp->tt.exch_done(seq);
886 }
887 fc_io_compl(fsp);
888}
889
890static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
891{
892 struct fc_lport *lp = fsp->lp;
893
894 if (fsp->seq_ptr) {
895 lp->tt.exch_done(fsp->seq_ptr);
896 fsp->seq_ptr = NULL;
897 }
898 fsp->status_code = error;
899}
900
901/**
34f42a07 902 * fc_fcp_cleanup_each_cmd() - Cleanup active commads
42e9a92f
RL		 903 * @lp: logical port
904 * @id: target id
905 * @lun: lun
906 * @error: fsp status code
907 *
908 * If lun or id is -1, they are ignored.
909 */
910static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
911 unsigned int lun, int error)
912{
913 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
914 struct fc_fcp_pkt *fsp;
915 struct scsi_cmnd *sc_cmd;
916 unsigned long flags;
917
918 spin_lock_irqsave(lp->host->host_lock, flags);
919restart:
920 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
921 sc_cmd = fsp->cmd;
922 if (id != -1 && scmd_id(sc_cmd) != id)
923 continue;
924
925 if (lun != -1 && sc_cmd->device->lun != lun)
926 continue;
927
928 fc_fcp_pkt_hold(fsp);
929 spin_unlock_irqrestore(lp->host->host_lock, flags);
930
931 if (!fc_fcp_lock_pkt(fsp)) {
932 fc_fcp_cleanup_cmd(fsp, error);
933 fc_io_compl(fsp);
934 fc_fcp_unlock_pkt(fsp);
935 }
936
937 fc_fcp_pkt_release(fsp);
938 spin_lock_irqsave(lp->host->host_lock, flags);
939 /*
940 * while we dropped the lock multiple pkts could
941 * have been released, so we have to start over.
942 */
943 goto restart;
944 }
945 spin_unlock_irqrestore(lp->host->host_lock, flags);
946}
947
948static void fc_fcp_abort_io(struct fc_lport *lp)
949{
950 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
951}
952
953/**
34f42a07 954 * fc_fcp_pkt_send() - send a fcp packet to the lower level.
42e9a92f
RL		 955 * @lp: fc lport
956 * @fsp: fc packet.
957 *
958 * This is called by upper layer protocol.
959 * Return : zero for success and -1 for failure
960 * Context : called from queuecommand which can be called from process
961 * or scsi soft irq.
962 * Locks : called with the host lock and irqs disabled.
963 */
964static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
965{
966 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
967 int rc;
968
969 fsp->cmd->SCp.ptr = (char *)fsp;
970 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
971 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
972
973 int_to_scsilun(fsp->cmd->device->lun,
974 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
975 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
976 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
977
978 spin_unlock_irq(lp->host->host_lock);
979 rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv);
980 spin_lock_irq(lp->host->host_lock);
981 if (rc)
982 list_del(&fsp->list);
983
984 return rc;
985}
986
987static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
988 void (*resp)(struct fc_seq *,
989 struct fc_frame *fp,
990 void *arg))
991{
992 struct fc_frame *fp;
993 struct fc_seq *seq;
994 struct fc_rport *rport;
995 struct fc_rport_libfc_priv *rp;
996 const size_t len = sizeof(fsp->cdb_cmd);
997 int rc = 0;
998
999 if (fc_fcp_lock_pkt(fsp))
1000 return 0;
1001
1002 fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
1003 if (!fp) {
1004 rc = -1;
1005 goto unlock;
1006 }
1007
1008 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1009 fr_cmd(fp) = fsp->cmd;
1010 rport = fsp->rport;
1011 fsp->max_payload = rport->maxframe_size;
1012 rp = rport->dd_data;
1013
1014 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1015 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1016 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1017
1018 seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1019 if (!seq) {
1020 fc_frame_free(fp);
1021 rc = -1;
1022 goto unlock;
1023 }
1024 fsp->last_pkt_time = jiffies;
1025 fsp->seq_ptr = seq;
1026 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1027
1028 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1029 fc_fcp_timer_set(fsp,
1030 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1031 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1032unlock:
1033 fc_fcp_unlock_pkt(fsp);
1034 return rc;
1035}
1036
1037/*
1038 * transport error handler
1039 */
1040static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1041{
1042 int error = PTR_ERR(fp);
1043
1044 if (fc_fcp_lock_pkt(fsp))
1045 return;
1046
1047 switch (error) {
1048 case -FC_EX_CLOSED:
1049 fc_fcp_retry_cmd(fsp);
1050 goto unlock;
1051 default:
1052 FC_DBG("unknown error %ld\n", PTR_ERR(fp));
1053 }
1054 /*
1055 * clear abort pending, because the lower layer
1056 * decided to force completion.
1057 */
1058 fsp->state &= ~FC_SRB_ABORT_PENDING;
1059 fsp->status_code = FC_CMD_PLOGO;
1060 fc_fcp_complete_locked(fsp);
1061unlock:
1062 fc_fcp_unlock_pkt(fsp);
1063}
1064
1065/*
1066 * Scsi abort handler- calls to send an abort
1067 * and then wait for abort completion
1068 */
1069static int fc_fcp_pkt_abort(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
1070{
1071 int rc = FAILED;
1072
1073 if (fc_fcp_send_abort(fsp))
1074 return FAILED;
1075
1076 init_completion(&fsp->tm_done);
1077 fsp->wait_for_comp = 1;
1078
1079 spin_unlock_bh(&fsp->scsi_pkt_lock);
1080 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1081 spin_lock_bh(&fsp->scsi_pkt_lock);
1082 fsp->wait_for_comp = 0;
1083
1084 if (!rc) {
1085 FC_DBG("target abort cmd failed\n");
1086 rc = FAILED;
1087 } else if (fsp->state & FC_SRB_ABORTED) {
1088 FC_DBG("target abort cmd passed\n");
1089 rc = SUCCESS;
1090 fc_fcp_complete_locked(fsp);
1091 }
1092
1093 return rc;
1094}
1095
1096/*
1097 * Retry LUN reset after resource allocation failed.
1098 */
1099static void fc_lun_reset_send(unsigned long data)
1100{
1101 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1102 struct fc_lport *lp = fsp->lp;
1103 if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) {
1104 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1105 return;
1106 if (fc_fcp_lock_pkt(fsp))
1107 return;
1108 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1109 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1110 fc_fcp_unlock_pkt(fsp);
1111 }
1112}
1113
1114/*
1115 * Scsi device reset handler- send a LUN RESET to the device
1116 * and wait for reset reply
1117 */
1118static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1119 unsigned int id, unsigned int lun)
1120{
1121 int rc;
1122
1123 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1124 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1125 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1126
1127 fsp->wait_for_comp = 1;
1128 init_completion(&fsp->tm_done);
1129
1130 fc_lun_reset_send((unsigned long)fsp);
1131
1132 /*
1133 * wait for completion of reset
1134 * after that make sure all commands are terminated
1135 */
1136 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1137
1138 spin_lock_bh(&fsp->scsi_pkt_lock);
1139 fsp->state |= FC_SRB_COMPL;
1140 spin_unlock_bh(&fsp->scsi_pkt_lock);
1141
1142 del_timer_sync(&fsp->timer);
1143
1144 spin_lock_bh(&fsp->scsi_pkt_lock);
1145 if (fsp->seq_ptr) {
1146 lp->tt.exch_done(fsp->seq_ptr);
1147 fsp->seq_ptr = NULL;
1148 }
1149 fsp->wait_for_comp = 0;
1150 spin_unlock_bh(&fsp->scsi_pkt_lock);
1151
1152 if (!rc) {
1153 FC_DBG("lun reset failed\n");
1154 return FAILED;
1155 }
1156
1157 /* cdb_status holds the tmf's rsp code */
1158 if (fsp->cdb_status != FCP_TMF_CMPL)
1159 return FAILED;
1160
1161 FC_DBG("lun reset to lun %u completed\n", lun);
1162 fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED);
1163 return SUCCESS;
1164}
1165
1166/*
1167 * Task Managment response handler
1168 */
1169static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1170{
1171 struct fc_fcp_pkt *fsp = arg;
1172 struct fc_frame_header *fh;
1173
1174 if (IS_ERR(fp)) {
1175 /*
1176 * If there is an error just let it timeout or wait
1177 * for TMF to be aborted if it timedout.
1178 *
1179 * scsi-eh will escalate for when either happens.
1180 */
1181 return;
1182 }
1183
1184 if (fc_fcp_lock_pkt(fsp))
1185 return;
1186
1187 /*
1188 * raced with eh timeout handler.
1189 */
1190 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1191 spin_unlock_bh(&fsp->scsi_pkt_lock);
1192 return;
1193 }
1194
1195 fh = fc_frame_header_get(fp);
1196 if (fh->fh_type != FC_TYPE_BLS)
1197 fc_fcp_resp(fsp, fp);
1198 fsp->seq_ptr = NULL;
1199 fsp->lp->tt.exch_done(seq);
1200 fc_frame_free(fp);
1201 fc_fcp_unlock_pkt(fsp);
1202}
1203
1204static void fc_fcp_cleanup(struct fc_lport *lp)
1205{
1206 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
1207}
1208
1209/*
1210 * fc_fcp_timeout: called by OS timer function.
1211 *
1212 * The timer has been inactivated and must be reactivated if desired
1213 * using fc_fcp_timer_set().
1214 *
1215 * Algorithm:
1216 *
1217 * If REC is supported, just issue it, and return. The REC exchange will
1218 * complete or time out, and recovery can continue at that point.
1219 *
1220 * Otherwise, if the response has been received without all the data,
1221 * it has been ER_TIMEOUT since the response was received.
1222 *
1223 * If the response has not been received,
1224 * we see if data was received recently. If it has been, we continue waiting,
1225 * otherwise, we abort the command.
1226 */
1227static void fc_fcp_timeout(unsigned long data)
1228{
1229 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1230 struct fc_rport *rport = fsp->rport;
1231 struct fc_rport_libfc_priv *rp = rport->dd_data;
1232
1233 if (fc_fcp_lock_pkt(fsp))
1234 return;
1235
1236 if (fsp->cdb_cmd.fc_tm_flags)
1237 goto unlock;
1238
1239 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1240
1241 if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
1242 fc_fcp_rec(fsp);
1243 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1244 jiffies))
1245 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1246 else if (fsp->state & FC_SRB_RCV_STATUS)
1247 fc_fcp_complete_locked(fsp);
1248 else
1249 fc_timeout_error(fsp);
1250 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1251unlock:
1252 fc_fcp_unlock_pkt(fsp);
1253}
1254
1255/*
1256 * Send a REC ELS request
1257 */
1258static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1259{
1260 struct fc_lport *lp;
1261 struct fc_frame *fp;
1262 struct fc_rport *rport;
1263 struct fc_rport_libfc_priv *rp;
1264
1265 lp = fsp->lp;
1266 rport = fsp->rport;
1267 rp = rport->dd_data;
1268 if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) {
1269 fsp->status_code = FC_HRD_ERROR;
1c9fbafc 1270 fsp->io_status = 0;
42e9a92f
RL		 1271 fc_fcp_complete_locked(fsp);
1272 return;
1273 }
1274 fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec));
1275 if (!fp)
1276 goto retry;
1277
1278 fr_seq(fp) = fsp->seq_ptr;
1279 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1280 fc_host_port_id(rp->local_port->host), FC_TYPE_ELS,
1281 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1282 if (lp->tt.elsct_send(lp, rport, fp, ELS_REC, fc_fcp_rec_resp,
1283 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1284 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1285 return;
1286 }
1287 fc_frame_free(fp);
1288retry:
1289 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1290 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1291 else
1292 fc_timeout_error(fsp);
1293}
1294
1295/*
1296 * Receive handler for REC ELS frame
1297 * if it is a reject then let the scsi layer to handle
1298 * the timeout. if it is a LS_ACC then if the io was not completed
1299 * then set the timeout and return otherwise complete the exchange
1300 * and tell the scsi layer to restart the I/O.
1301 */
1302static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1303{
1304 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1305 struct fc_els_rec_acc *recp;
1306 struct fc_els_ls_rjt *rjt;
1307 u32 e_stat;
1308 u8 opcode;
1309 u32 offset;
1310 enum dma_data_direction data_dir;
1311 enum fc_rctl r_ctl;
1312 struct fc_rport_libfc_priv *rp;
1313
1314 if (IS_ERR(fp)) {
1315 fc_fcp_rec_error(fsp, fp);
1316 return;
1317 }
1318
1319 if (fc_fcp_lock_pkt(fsp))
1320 goto out;
1321
1322 fsp->recov_retry = 0;
1323 opcode = fc_frame_payload_op(fp);
1324 if (opcode == ELS_LS_RJT) {
1325 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1326 switch (rjt->er_reason) {
1327 default:
1328 FC_DEBUG_FCP("device %x unexpected REC reject "
1329 "reason %d expl %d\n",
1330 fsp->rport->port_id, rjt->er_reason,
1331 rjt->er_explan);
1332 /* fall through */
1333 case ELS_RJT_UNSUP:
1334 FC_DEBUG_FCP("device does not support REC\n");
1335 rp = fsp->rport->dd_data;
1336 /*
1337 * if we do not spport RECs or got some bogus
1338 * reason then resetup timer so we check for
1339 * making progress.
1340 */
1341 rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1342 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1343 break;
1344 case ELS_RJT_LOGIC:
1345 case ELS_RJT_UNAB:
1346 /*
1347 * If no data transfer, the command frame got dropped
1348 * so we just retry. If data was transferred, we
1349 * lost the response but the target has no record,
1350 * so we abort and retry.
1351 */
1352 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1353 fsp->xfer_len == 0) {
1354 fc_fcp_retry_cmd(fsp);
1355 break;
1356 }
1357 fc_timeout_error(fsp);
1358 break;
1359 }
1360 } else if (opcode == ELS_LS_ACC) {
1361 if (fsp->state & FC_SRB_ABORTED)
1362 goto unlock_out;
1363
1364 data_dir = fsp->cmd->sc_data_direction;
1365 recp = fc_frame_payload_get(fp, sizeof(*recp));
1366 offset = ntohl(recp->reca_fc4value);
1367 e_stat = ntohl(recp->reca_e_stat);
1368
1369 if (e_stat & ESB_ST_COMPLETE) {
1370
1371 /*
1372 * The exchange is complete.
1373 *
1374 * For output, we must've lost the response.
1375 * For input, all data must've been sent.
1376 * We lost may have lost the response
1377 * (and a confirmation was requested) and maybe
1378 * some data.
1379 *
1380 * If all data received, send SRR
1381 * asking for response. If partial data received,
1382 * or gaps, SRR requests data at start of gap.
1383 * Recovery via SRR relies on in-order-delivery.
1384 */
1385 if (data_dir == DMA_TO_DEVICE) {
1386 r_ctl = FC_RCTL_DD_CMD_STATUS;
1387 } else if (fsp->xfer_contig_end == offset) {
1388 r_ctl = FC_RCTL_DD_CMD_STATUS;
1389 } else {
1390 offset = fsp->xfer_contig_end;
1391 r_ctl = FC_RCTL_DD_SOL_DATA;
1392 }
1393 fc_fcp_srr(fsp, r_ctl, offset);
1394 } else if (e_stat & ESB_ST_SEQ_INIT) {
1395
1396 /*
1397 * The remote port has the initiative, so just
1398 * keep waiting for it to complete.
1399 */
1400 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1401 } else {
1402
1403 /*
1404 * The exchange is incomplete, we have seq. initiative.
1405 * Lost response with requested confirmation,
1406 * lost confirmation, lost transfer ready or
1407 * lost write data.
1408 *
1409 * For output, if not all data was received, ask
1410 * for transfer ready to be repeated.
1411 *
1412 * If we received or sent all the data, send SRR to
1413 * request response.
1414 *
1415 * If we lost a response, we may have lost some read
1416 * data as well.
1417 */
1418 r_ctl = FC_RCTL_DD_SOL_DATA;
1419 if (data_dir == DMA_TO_DEVICE) {
1420 r_ctl = FC_RCTL_DD_CMD_STATUS;
1421 if (offset < fsp->data_len)
1422 r_ctl = FC_RCTL_DD_DATA_DESC;
1423 } else if (offset == fsp->xfer_contig_end) {
1424 r_ctl = FC_RCTL_DD_CMD_STATUS;
1425 } else if (fsp->xfer_contig_end < offset) {
1426 offset = fsp->xfer_contig_end;
1427 }
1428 fc_fcp_srr(fsp, r_ctl, offset);
1429 }
1430 }
1431unlock_out:
1432 fc_fcp_unlock_pkt(fsp);
1433out:
1434 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1435 fc_frame_free(fp);
1436}
1437
1438/*
1439 * Handle error response or timeout for REC exchange.
1440 */
1441static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1442{
1443 int error = PTR_ERR(fp);
1444
1445 if (fc_fcp_lock_pkt(fsp))
1446 goto out;
1447
1448 switch (error) {
1449 case -FC_EX_CLOSED:
1450 fc_fcp_retry_cmd(fsp);
1451 break;
1452
1453 default:
1454 FC_DBG("REC %p fid %x error unexpected error %d\n",
1455 fsp, fsp->rport->port_id, error);
1456 fsp->status_code = FC_CMD_PLOGO;
1457 /* fall through */
1458
1459 case -FC_EX_TIMEOUT:
1460 /*
1461 * Assume REC or LS_ACC was lost.
1462 * The exchange manager will have aborted REC, so retry.
1463 */
1464 FC_DBG("REC fid %x error error %d retry %d/%d\n",
1465 fsp->rport->port_id, error, fsp->recov_retry,
1466 FC_MAX_RECOV_RETRY);
1467 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1468 fc_fcp_rec(fsp);
1469 else
1470 fc_timeout_error(fsp);
1471 break;
1472 }
1473 fc_fcp_unlock_pkt(fsp);
1474out:
1475 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1476}
1477
1478/*
1479 * Time out error routine:
1480 * abort's the I/O close the exchange and
1481 * send completion notification to scsi layer
1482 */
1483static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1484{
1485 fsp->status_code = FC_CMD_TIME_OUT;
1486 fsp->cdb_status = 0;
1487 fsp->io_status = 0;
1488 /*
1489 * if this fails then we let the scsi command timer fire and
1490 * scsi-ml escalate.
1491 */
1492 fc_fcp_send_abort(fsp);
1493}
1494
1495/*
1496 * Sequence retransmission request.
1497 * This is called after receiving status but insufficient data, or
1498 * when expecting status but the request has timed out.
1499 */
1500static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1501{
1502 struct fc_lport *lp = fsp->lp;
1503 struct fc_rport *rport;
1504 struct fc_rport_libfc_priv *rp;
1505 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1506 struct fc_seq *seq;
1507 struct fcp_srr *srr;
1508 struct fc_frame *fp;
1509 u8 cdb_op;
1510
1511 rport = fsp->rport;
1512 rp = rport->dd_data;
1513 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1514
1515 if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
1516 goto retry; /* shouldn't happen */
1517 fp = fc_frame_alloc(lp, sizeof(*srr));
1518 if (!fp)
1519 goto retry;
1520
1521 srr = fc_frame_payload_get(fp, sizeof(*srr));
1522 memset(srr, 0, sizeof(*srr));
1523 srr->srr_op = ELS_SRR;
1524 srr->srr_ox_id = htons(ep->oxid);
1525 srr->srr_rx_id = htons(ep->rxid);
1526 srr->srr_r_ctl = r_ctl;
1527 srr->srr_rel_off = htonl(offset);
1528
1529 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1530 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1531 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1532
1533 seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL,
1534 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1535 if (!seq) {
1536 fc_frame_free(fp);
1537 goto retry;
1538 }
1539 fsp->recov_seq = seq;
1540 fsp->xfer_len = offset;
1541 fsp->xfer_contig_end = offset;
1542 fsp->state &= ~FC_SRB_RCV_STATUS;
1543 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1544 return;
1545retry:
1546 fc_fcp_retry_cmd(fsp);
1547}
1548
1549/*
1550 * Handle response from SRR.
1551 */
1552static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1553{
1554 struct fc_fcp_pkt *fsp = arg;
1555 struct fc_frame_header *fh;
1556
1557 if (IS_ERR(fp)) {
1558 fc_fcp_srr_error(fsp, fp);
1559 return;
1560 }
1561
1562 if (fc_fcp_lock_pkt(fsp))
1563 goto out;
1564
1565 fh = fc_frame_header_get(fp);
1566 /*
1567 * BUG? fc_fcp_srr_error calls exch_done which would release
1568 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1569 * then fc_exch_timeout would be sending an abort. The exch_done
1570 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1571 * an abort response though.
1572 */
1573 if (fh->fh_type == FC_TYPE_BLS) {
1574 fc_fcp_unlock_pkt(fsp);
1575 return;
1576 }
1577
1578 fsp->recov_seq = NULL;
1579 switch (fc_frame_payload_op(fp)) {
1580 case ELS_LS_ACC:
1581 fsp->recov_retry = 0;
1582 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1583 break;
1584 case ELS_LS_RJT:
1585 default:
1586 fc_timeout_error(fsp);
1587 break;
1588 }
1589 fc_fcp_unlock_pkt(fsp);
1590 fsp->lp->tt.exch_done(seq);
1591out:
1592 fc_frame_free(fp);
1593 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1594}
1595
1596static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1597{
1598 if (fc_fcp_lock_pkt(fsp))
1599 goto out;
1600 fsp->lp->tt.exch_done(fsp->recov_seq);
1601 fsp->recov_seq = NULL;
1602 switch (PTR_ERR(fp)) {
1603 case -FC_EX_TIMEOUT:
1604 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1605 fc_fcp_rec(fsp);
1606 else
1607 fc_timeout_error(fsp);
1608 break;
1609 case -FC_EX_CLOSED: /* e.g., link failure */
1610 /* fall through */
1611 default:
1612 fc_fcp_retry_cmd(fsp);
1613 break;
1614 }
1615 fc_fcp_unlock_pkt(fsp);
1616out:
1617 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1618}
1619
1620static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
1621{
1622 /* lock ? */
bc0e17f6 1623 return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull;
42e9a92f
RL		 1624}
1625
1626/**
1627 * fc_queuecommand - The queuecommand function of the scsi template
1628 * @cmd: struct scsi_cmnd to be executed
1629 * @done: Callback function to be called when cmd is completed
1630 *
1631 * this is the i/o strategy routine, called by the scsi layer
1632 * this routine is called with holding the host_lock.
1633 */
1634int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1635{
1636 struct fc_lport *lp;
1637 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1638 struct fc_fcp_pkt *fsp;
1639 struct fc_rport_libfc_priv *rp;
1640 int rval;
1641 int rc = 0;
1642 struct fcoe_dev_stats *stats;
1643
1644 lp = shost_priv(sc_cmd->device->host);
1645
1646 rval = fc_remote_port_chkready(rport);
1647 if (rval) {
1648 sc_cmd->result = rval;
1649 done(sc_cmd);
1650 goto out;
1651 }
1652
1653 if (!*(struct fc_remote_port **)rport->dd_data) {
1654 /*
1655 * rport is transitioning from blocked/deleted to
1656 * online
1657 */
1658 sc_cmd->result = DID_IMM_RETRY << 16;
1659 done(sc_cmd);
1660 goto out;
1661 }
1662
1663 rp = rport->dd_data;
1664
1665 if (!fc_fcp_lport_queue_ready(lp)) {
1666 rc = SCSI_MLQUEUE_HOST_BUSY;
1667 goto out;
1668 }
1669
1670 fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
1671 if (fsp == NULL) {
1672 rc = SCSI_MLQUEUE_HOST_BUSY;
1673 goto out;
1674 }
1675
1676 /*
1677 * build the libfc request pkt
1678 */
1679 fsp->cmd = sc_cmd; /* save the cmd */
1680 fsp->lp = lp; /* save the softc ptr */
1681 fsp->rport = rport; /* set the remote port ptr */
1682 sc_cmd->scsi_done = done;
1683
1684 /*
1685 * set up the transfer length
1686 */
1687 fsp->data_len = scsi_bufflen(sc_cmd);
1688 fsp->xfer_len = 0;
1689
1690 /*
1691 * setup the data direction
1692 */
1693 stats = lp->dev_stats[smp_processor_id()];
1694 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1695 fsp->req_flags = FC_SRB_READ;
1696 stats->InputRequests++;
1697 stats->InputMegabytes = fsp->data_len;
1698 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1699 fsp->req_flags = FC_SRB_WRITE;
1700 stats->OutputRequests++;
1701 stats->OutputMegabytes = fsp->data_len;
1702 } else {
1703 fsp->req_flags = 0;
1704 stats->ControlRequests++;
1705 }
1706
1707 fsp->tgt_flags = rp->flags;
1708
1709 init_timer(&fsp->timer);
1710 fsp->timer.data = (unsigned long)fsp;
1711
1712 /*
1713 * send it to the lower layer
1714 * if we get -1 return then put the request in the pending
1715 * queue.
1716 */
1717 rval = fc_fcp_pkt_send(lp, fsp);
1718 if (rval != 0) {
1719 fsp->state = FC_SRB_FREE;
1720 fc_fcp_pkt_release(fsp);
1721 rc = SCSI_MLQUEUE_HOST_BUSY;
1722 }
1723out:
1724 return rc;
1725}
1726EXPORT_SYMBOL(fc_queuecommand);
1727
1728/**
34f42a07 1729 * fc_io_compl() - Handle responses for completed commands
42e9a92f
RL		 1730 * @fsp: scsi packet
1731 *
1732 * Translates a error to a Linux SCSI error.
1733 *
1734 * The fcp packet lock must be held when calling.
1735 */
1736static void fc_io_compl(struct fc_fcp_pkt *fsp)
1737{
1738 struct fc_fcp_internal *si;
1739 struct scsi_cmnd *sc_cmd;
1740 struct fc_lport *lp;
1741 unsigned long flags;
1742
1743 fsp->state |= FC_SRB_COMPL;
1744 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1745 spin_unlock_bh(&fsp->scsi_pkt_lock);
1746 del_timer_sync(&fsp->timer);
1747 spin_lock_bh(&fsp->scsi_pkt_lock);
1748 }
1749
1750 lp = fsp->lp;
1751 si = fc_get_scsi_internal(lp);
1752 spin_lock_irqsave(lp->host->host_lock, flags);
1753 if (!fsp->cmd) {
1754 spin_unlock_irqrestore(lp->host->host_lock, flags);
1755 return;
1756 }
1757
1758 /*
1759 * if a command timed out while we had to try and throttle IO
1760 * and it is now getting cleaned up, then we are about to
1761 * try again so clear the throttled flag incase we get more
1762 * time outs.
1763 */
1764 if (si->throttled && fsp->state & FC_SRB_NOMEM)
1765 si->throttled = 0;
1766
1767 sc_cmd = fsp->cmd;
1768 fsp->cmd = NULL;
1769
1770 if (!sc_cmd->SCp.ptr) {
1771 spin_unlock_irqrestore(lp->host->host_lock, flags);
1772 return;
1773 }
1774
1775 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1776 switch (fsp->status_code) {
1777 case FC_COMPLETE:
1778 if (fsp->cdb_status == 0) {
1779 /*
1780 * good I/O status
1781 */
1782 sc_cmd->result = DID_OK << 16;
1783 if (fsp->scsi_resid)
1784 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1785 } else if (fsp->cdb_status == QUEUE_FULL) {
1786 struct scsi_device *tmp_sdev;
1787 struct scsi_device *sdev = sc_cmd->device;
1788
1789 shost_for_each_device(tmp_sdev, sdev->host) {
1790 if (tmp_sdev->id != sdev->id)
1791 continue;
1792
1793 if (tmp_sdev->queue_depth > 1) {
1794 scsi_track_queue_full(tmp_sdev,
1795 tmp_sdev->
1796 queue_depth - 1);
1797 }
1798 }
1799 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1800 } else {
1801 /*
1802 * transport level I/O was ok but scsi
1803 * has non zero status
1804 */
1805 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1806 }
1807 break;
1808 case FC_ERROR:
1809 sc_cmd->result = DID_ERROR << 16;
1810 break;
1811 case FC_DATA_UNDRUN:
26d9cab5 1812 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
42e9a92f
RL		 1813 /*
1814 * scsi status is good but transport level
26d9cab5 1815 * underrun.
42e9a92f 1816 */
26d9cab5 1817 sc_cmd->result = DID_OK << 16;
42e9a92f
RL		 1818 } else {
1819 /*
1820 * scsi got underrun, this is an error
1821 */
1822 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1823 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1824 }
1825 break;
1826 case FC_DATA_OVRRUN:
1827 /*
1828 * overrun is an error
1829 */
1830 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1831 break;
1832 case FC_CMD_ABORTED:
1833 sc_cmd->result = (DID_ABORT << 16) | fsp->io_status;
1834 break;
1835 case FC_CMD_TIME_OUT:
1836 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1837 break;
1838 case FC_CMD_RESET:
1839 sc_cmd->result = (DID_RESET << 16);
1840 break;
1841 case FC_HRD_ERROR:
1842 sc_cmd->result = (DID_NO_CONNECT << 16);
1843 break;
1844 default:
1845 sc_cmd->result = (DID_ERROR << 16);
1846 break;
1847 }
1848
1849 list_del(&fsp->list);
1850 sc_cmd->SCp.ptr = NULL;
1851 sc_cmd->scsi_done(sc_cmd);
1852 spin_unlock_irqrestore(lp->host->host_lock, flags);
1853
1854 /* release ref from initial allocation in queue command */
1855 fc_fcp_pkt_release(fsp);
1856}
1857
1858/**
34f42a07 1859 * fc_fcp_complete() - complete processing of a fcp packet
42e9a92f
RL		 1860 * @fsp: fcp packet
1861 *
1862 * This function may sleep if a fsp timer is pending.
1863 * The host lock must not be held by caller.
1864 */
1865void fc_fcp_complete(struct fc_fcp_pkt *fsp)
1866{
1867 if (fc_fcp_lock_pkt(fsp))
1868 return;
1869
1870 fc_fcp_complete_locked(fsp);
1871 fc_fcp_unlock_pkt(fsp);
1872}
1873EXPORT_SYMBOL(fc_fcp_complete);
1874
1875/**
34f42a07 1876 * fc_eh_abort() - Abort a command
42e9a92f
RL		 1877 * @sc_cmd: scsi command to abort
1878 *
34f42a07 1879 * From scsi host template.
42e9a92f
RL		 1880 * send ABTS to the target device and wait for the response
1881 * sc_cmd is the pointer to the command to be aborted.
1882 */
1883int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1884{
1885 struct fc_fcp_pkt *fsp;
1886 struct fc_lport *lp;
1887 int rc = FAILED;
1888 unsigned long flags;
1889
1890 lp = shost_priv(sc_cmd->device->host);
1891 if (lp->state != LPORT_ST_READY)
1892 return rc;
bc0e17f6 1893 else if (!lp->link_up)
42e9a92f
RL		 1894 return rc;
1895
1896 spin_lock_irqsave(lp->host->host_lock, flags);
1897 fsp = CMD_SP(sc_cmd);
1898 if (!fsp) {
1899 /* command completed while scsi eh was setting up */
1900 spin_unlock_irqrestore(lp->host->host_lock, flags);
1901 return SUCCESS;
1902 }
1903 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1904 fc_fcp_pkt_hold(fsp);
1905 spin_unlock_irqrestore(lp->host->host_lock, flags);
1906
1907 if (fc_fcp_lock_pkt(fsp)) {
1908 /* completed while we were waiting for timer to be deleted */
1909 rc = SUCCESS;
1910 goto release_pkt;
1911 }
1912
1913 rc = fc_fcp_pkt_abort(lp, fsp);
1914 fc_fcp_unlock_pkt(fsp);
1915
1916release_pkt:
1917 fc_fcp_pkt_release(fsp);
1918 return rc;
1919}
1920EXPORT_SYMBOL(fc_eh_abort);
1921
1922/**
34f42a07 1923 * fc_eh_device_reset() Reset a single LUN
42e9a92f
RL		 1924 * @sc_cmd: scsi command
1925 *
1926 * Set from scsi host template to send tm cmd to the target and wait for the
1927 * response.
1928 */
1929int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1930{
1931 struct fc_lport *lp;
1932 struct fc_fcp_pkt *fsp;
1933 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1934 int rc = FAILED;
1935 struct fc_rport_libfc_priv *rp;
1936 int rval;
1937
1938 rval = fc_remote_port_chkready(rport);
1939 if (rval)
1940 goto out;
1941
1942 rp = rport->dd_data;
1943 lp = shost_priv(sc_cmd->device->host);
1944
1945 if (lp->state != LPORT_ST_READY)
1946 return rc;
1947
1948 fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
1949 if (fsp == NULL) {
1950 FC_DBG("could not allocate scsi_pkt\n");
1951 sc_cmd->result = DID_NO_CONNECT << 16;
1952 goto out;
1953 }
1954
1955 /*
1956 * Build the libfc request pkt. Do not set the scsi cmnd, because
1957 * the sc passed in is not setup for execution like when sent
1958 * through the queuecommand callout.
1959 */
1960 fsp->lp = lp; /* save the softc ptr */
1961 fsp->rport = rport; /* set the remote port ptr */
1962
1963 /*
1964 * flush outstanding commands
1965 */
1966 rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
1967 fsp->state = FC_SRB_FREE;
1968 fc_fcp_pkt_release(fsp);
1969
1970out:
1971 return rc;
1972}
1973EXPORT_SYMBOL(fc_eh_device_reset);
1974
1975/**
34f42a07 1976 * fc_eh_host_reset() - The reset function will reset the ports on the host.
42e9a92f
RL		 1977 * @sc_cmd: scsi command
1978 */
1979int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
1980{
1981 struct Scsi_Host *shost = sc_cmd->device->host;
1982 struct fc_lport *lp = shost_priv(shost);
1983 unsigned long wait_tmo;
1984
1985 lp->tt.lport_reset(lp);
1986 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
1987 while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
1988 msleep(1000);
1989
1990 if (fc_fcp_lport_queue_ready(lp)) {
1991 shost_printk(KERN_INFO, shost, "Host reset succeeded.\n");
1992 return SUCCESS;
1993 } else {
1994 shost_printk(KERN_INFO, shost, "Host reset failed. "
1995 "lport not ready.\n");
1996 return FAILED;
1997 }
1998}
1999EXPORT_SYMBOL(fc_eh_host_reset);
2000
2001/**
34f42a07 2002 * fc_slave_alloc() - configure queue depth
42e9a92f
RL		 2003 * @sdev: scsi device
2004 *
2005 * Configures queue depth based on host's cmd_per_len. If not set
2006 * then we use the libfc default.
2007 */
2008int fc_slave_alloc(struct scsi_device *sdev)
2009{
2010 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2011 int queue_depth;
2012
2013 if (!rport || fc_remote_port_chkready(rport))
2014 return -ENXIO;
2015
2016 if (sdev->tagged_supported) {
2017 if (sdev->host->hostt->cmd_per_lun)
2018 queue_depth = sdev->host->hostt->cmd_per_lun;
2019 else
2020 queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
2021 scsi_activate_tcq(sdev, queue_depth);
2022 }
2023 return 0;
2024}
2025EXPORT_SYMBOL(fc_slave_alloc);
2026
2027int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2028{
2029 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2030 return sdev->queue_depth;
2031}
2032EXPORT_SYMBOL(fc_change_queue_depth);
2033
2034int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2035{
2036 if (sdev->tagged_supported) {
2037 scsi_set_tag_type(sdev, tag_type);
2038 if (tag_type)
2039 scsi_activate_tcq(sdev, sdev->queue_depth);
2040 else
2041 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2042 } else
2043 tag_type = 0;
2044
2045 return tag_type;
2046}
2047EXPORT_SYMBOL(fc_change_queue_type);
2048
2049void fc_fcp_destroy(struct fc_lport *lp)
2050{
2051 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
2052
2053 if (!list_empty(&si->scsi_pkt_queue))
2054 printk(KERN_ERR "Leaked scsi packets.\n");
2055
2056 mempool_destroy(si->scsi_pkt_pool);
2057 kfree(si);
2058 lp->scsi_priv = NULL;
2059}
2060EXPORT_SYMBOL(fc_fcp_destroy);
2061
2062int fc_fcp_init(struct fc_lport *lp)
2063{
2064 int rc;
2065 struct fc_fcp_internal *si;
2066
2067 if (!lp->tt.fcp_cmd_send)
2068 lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
2069
2070 if (!lp->tt.fcp_cleanup)
2071 lp->tt.fcp_cleanup = fc_fcp_cleanup;
2072
2073 if (!lp->tt.fcp_abort_io)
2074 lp->tt.fcp_abort_io = fc_fcp_abort_io;
2075
2076 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2077 if (!si)
2078 return -ENOMEM;
2079 lp->scsi_priv = si;
2080 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2081
2082 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2083 if (!si->scsi_pkt_pool) {
2084 rc = -ENOMEM;
2085 goto free_internal;
2086 }
2087 return 0;
2088
2089free_internal:
2090 kfree(si);
2091 return rc;
2092}
2093EXPORT_SYMBOL(fc_fcp_init);
2094
2095static int __init libfc_init(void)
2096{
2097 int rc;
2098
2099 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2100 sizeof(struct fc_fcp_pkt),
2101 0, SLAB_HWCACHE_ALIGN, NULL);
2102 if (scsi_pkt_cachep == NULL) {
2103 FC_DBG("Unable to allocate SRB cache...module load failed!");
2104 return -ENOMEM;
2105 }
2106
2107 rc = fc_setup_exch_mgr();
2108 if (rc)
2109 goto destroy_pkt_cache;
2110
2111 rc = fc_setup_rport();
2112 if (rc)
2113 goto destroy_em;
2114
2115 return rc;
2116destroy_em:
2117 fc_destroy_exch_mgr();
2118destroy_pkt_cache:
2119 kmem_cache_destroy(scsi_pkt_cachep);
2120 return rc;
2121}
2122
2123static void __exit libfc_exit(void)
2124{
2125 kmem_cache_destroy(scsi_pkt_cachep);
2126 fc_destroy_exch_mgr();
2127 fc_destroy_rport();
2128}
2129
2130module_init(libfc_init);
2131module_exit(libfc_exit);
kernel source for telekom puls (alcatel/mediatek)