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close_port, kpacket_gen kmalloc oom, formard.c wake_sender/skb receive oom handling...
[cor_2_6_31.git] / drivers / scsi / libfc / fc_fcp.c
blobe303e0d12c4b1c626d7fc3837d0aa35fe9051063
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
42 MODULE_AUTHOR("Open-FCoE.org");
43 MODULE_DESCRIPTION("libfc");
44 MODULE_LICENSE("GPL v2");
45
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");
49
50 static struct kmem_cache *scsi_pkt_cachep;
51
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 */
62
63 #define FC_SRB_READ (1 << 1)
64 #define FC_SRB_WRITE (1 << 0)
65
66 /*
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.
69 */
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)
75
76 struct fc_fcp_internal {
77 mempool_t *scsi_pkt_pool;
78 struct list_head scsi_pkt_queue;
79 u8 throttled;
80 };
81
82 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
83
84 /*
85 * function prototypes
86 * FC scsi I/O related functions
87 */
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 *);
100
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 *);
104
105 /*
106 * command status codes
107 */
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
119
120 /*
121 * Error recovery timeout values.
122 */
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)
127
128 #define FC_MAX_ERROR_CNT 5
129 #define FC_MAX_RECOV_RETRY 3
130
131 #define FC_FCP_DFLT_QUEUE_DEPTH 32
132
133 /**
134 * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet
135 * @lp: fc lport struct
136 * @gfp: gfp flags for allocation
137 *
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.
141 */
142 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp)
143 {
144 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
145 struct fc_fcp_pkt *fsp;
146
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);
155 }
156 return fsp;
157 }
158
159 /**
160 * fc_fcp_pkt_release() - release hold on scsi_pkt packet
161 * @fsp: fcp packet struct
162 *
163 * This is used by upper layer scsi driver.
164 * Context : call from process and interrupt context.
165 * no locking required
166 */
167 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
168 {
169 if (atomic_dec_and_test(&fsp->ref_cnt)) {
170 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
171
172 mempool_free(fsp, si->scsi_pkt_pool);
173 }
174 }
175
176 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
177 {
178 atomic_inc(&fsp->ref_cnt);
179 }
180
181 /**
182 * fc_fcp_pkt_destory() - release hold on scsi_pkt packet
183 * @seq: exchange sequence
184 * @fsp: fcp packet struct
185 *
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
190 */
191 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
192 {
193 fc_fcp_pkt_release(fsp);
194 }
195
196 /**
197 * fc_fcp_lock_pkt() - lock a packet and get a ref to it.
198 * @fsp: fcp packet
199 *
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.
204 *
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.
208 *
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.
212 */
213 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
214 {
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;
219 }
220
221 fc_fcp_pkt_hold(fsp);
222 return 0;
223 }
224
225 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
226 {
227 spin_unlock_bh(&fsp->scsi_pkt_lock);
228 fc_fcp_pkt_release(fsp);
229 }
230
231 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
232 {
233 if (!(fsp->state & FC_SRB_COMPL))
234 mod_timer(&fsp->timer, jiffies + delay);
235 }
236
237 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
238 {
239 if (!fsp->seq_ptr)
240 return -EINVAL;
241
242 fsp->state |= FC_SRB_ABORT_PENDING;
243 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
244 }
245
246 /*
247 * Retry command.
248 * An abort isn't needed.
249 */
250 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
251 {
252 if (fsp->seq_ptr) {
253 fsp->lp->tt.exch_done(fsp->seq_ptr);
254 fsp->seq_ptr = NULL;
255 }
256
257 fsp->state &= ~FC_SRB_ABORT_PENDING;
258 fsp->io_status = 0;
259 fsp->status_code = FC_ERROR;
260 fc_fcp_complete_locked(fsp);
261 }
262
263 /*
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
267 *
268 * This is called in exch_seq_send() when we have a newly allocated
269 * exchange with a valid exchange id to setup ddp.
270 *
271 * returns: none
272 */
273 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
274 {
275 struct fc_lport *lp;
276
277 if (!fsp)
278 return;
279
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;
286 }
287 }
288 EXPORT_SYMBOL(fc_fcp_ddp_setup);
289
290 /*
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
295 *
296 * returns: none
297 */
298 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
299 {
300 struct fc_lport *lp;
301
302 if (!fsp)
303 return;
304
305 lp = fsp->lp;
306 if (fsp->xfer_ddp && lp->tt.ddp_done) {
307 fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp);
308 fsp->xfer_ddp = 0;
309 }
310 }
311
312
313 /*
314 * Receive SCSI data from target.
315 * Called after receiving solicited data.
316 */
317 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
318 {
319 struct scsi_cmnd *sc = fsp->cmd;
320 struct fc_lport *lp = fsp->lp;
321 struct fcoe_dev_stats *stats;
322 struct fc_frame_header *fh;
323 size_t start_offset;
324 size_t offset;
325 u32 crc;
326 u32 copy_len = 0;
327 size_t len;
328 void *buf;
329 struct scatterlist *sg;
330 size_t remaining;
331
332 fh = fc_frame_header_get(fp);
333 offset = ntohl(fh->fh_parm_offset);
334 start_offset = offset;
335 len = fr_len(fp) - sizeof(*fh);
336 buf = fc_frame_payload_get(fp, 0);
337
338 /* if this I/O is ddped, update xfer len */
339 fc_fcp_ddp_done(fsp);
340
341 if (offset + len > fsp->data_len) {
342 /* this should never happen */
343 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
344 fc_frame_crc_check(fp))
345 goto crc_err;
346 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
347 "data_len %x\n", len, offset, fsp->data_len);
348 fc_fcp_retry_cmd(fsp);
349 return;
350 }
351 if (offset != fsp->xfer_len)
352 fsp->state |= FC_SRB_DISCONTIG;
353
354 crc = 0;
355 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
356 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
357
358 sg = scsi_sglist(sc);
359 remaining = len;
360
361 while (remaining > 0 && sg) {
362 size_t off;
363 void *page_addr;
364 size_t sg_bytes;
365
366 if (offset >= sg->length) {
367 offset -= sg->length;
368 sg = sg_next(sg);
369 continue;
370 }
371 sg_bytes = min(remaining, sg->length - offset);
372
373 /*
374 * The scatterlist item may be bigger than PAGE_SIZE,
375 * but we are limited to mapping PAGE_SIZE at a time.
376 */
377 off = offset + sg->offset;
378 sg_bytes = min(sg_bytes, (size_t)
379 (PAGE_SIZE - (off & ~PAGE_MASK)));
380 page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
381 KM_SOFTIRQ0);
382 if (!page_addr)
383 break; /* XXX panic? */
384
385 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
386 crc = crc32(crc, buf, sg_bytes);
387 memcpy((char *)page_addr + (off & ~PAGE_MASK), buf,
388 sg_bytes);
389
390 kunmap_atomic(page_addr, KM_SOFTIRQ0);
391 buf += sg_bytes;
392 offset += sg_bytes;
393 remaining -= sg_bytes;
394 copy_len += sg_bytes;
395 }
396
397 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
398 buf = fc_frame_payload_get(fp, 0);
399 if (len % 4) {
400 crc = crc32(crc, buf + len, 4 - (len % 4));
401 len += 4 - (len % 4);
402 }
403
404 if (~crc != le32_to_cpu(fr_crc(fp))) {
405 crc_err:
406 stats = fc_lport_get_stats(lp);
407 stats->ErrorFrames++;
408 /* FIXME - per cpu count, not total count! */
409 if (stats->InvalidCRCCount++ < 5)
410 printk(KERN_WARNING "libfc: CRC error on data "
411 "frame for port (%6x)\n",
412 fc_host_port_id(lp->host));
413 /*
414 * Assume the frame is total garbage.
415 * We may have copied it over the good part
416 * of the buffer.
417 * If so, we need to retry the entire operation.
418 * Otherwise, ignore it.
419 */
420 if (fsp->state & FC_SRB_DISCONTIG)
421 fc_fcp_retry_cmd(fsp);
422 return;
423 }
424 }
425
426 if (fsp->xfer_contig_end == start_offset)
427 fsp->xfer_contig_end += copy_len;
428 fsp->xfer_len += copy_len;
429
430 /*
431 * In the very rare event that this data arrived after the response
432 * and completes the transfer, call the completion handler.
433 */
434 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
435 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
436 fc_fcp_complete_locked(fsp);
437 }
438
439 /**
440 * fc_fcp_send_data() - Send SCSI data to target.
441 * @fsp: ptr to fc_fcp_pkt
442 * @sp: ptr to this sequence
443 * @offset: starting offset for this data request
444 * @seq_blen: the burst length for this data request
445 *
446 * Called after receiving a Transfer Ready data descriptor.
447 * if LLD is capable of seq offload then send down seq_blen
448 * size of data in single frame, otherwise send multiple FC
449 * frames of max FC frame payload supported by target port.
450 *
451 * Returns : 0 for success.
452 */
453 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
454 size_t offset, size_t seq_blen)
455 {
456 struct fc_exch *ep;
457 struct scsi_cmnd *sc;
458 struct scatterlist *sg;
459 struct fc_frame *fp = NULL;
460 struct fc_lport *lp = fsp->lp;
461 size_t remaining;
462 size_t t_blen;
463 size_t tlen;
464 size_t sg_bytes;
465 size_t frame_offset, fh_parm_offset;
466 int error;
467 void *data = NULL;
468 void *page_addr;
469 int using_sg = lp->sg_supp;
470 u32 f_ctl;
471
472 WARN_ON(seq_blen <= 0);
473 if (unlikely(offset + seq_blen > fsp->data_len)) {
474 /* this should never happen */
475 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
476 "offset %zx\n", seq_blen, offset);
477 fc_fcp_send_abort(fsp);
478 return 0;
479 } else if (offset != fsp->xfer_len) {
480 /* Out of Order Data Request - no problem, but unexpected. */
481 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
482 "seq_blen %zx offset %zx\n", seq_blen, offset);
483 }
484
485 /*
486 * if LLD is capable of seq_offload then set transport
487 * burst length (t_blen) to seq_blen, otherwise set t_blen
488 * to max FC frame payload previously set in fsp->max_payload.
489 */
490 t_blen = fsp->max_payload;
491 if (lp->seq_offload) {
492 t_blen = min(seq_blen, (size_t)lp->lso_max);
493 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
494 fsp, seq_blen, lp->lso_max, t_blen);
495 }
496
497 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
498 if (t_blen > 512)
499 t_blen &= ~(512 - 1); /* round down to block size */
500 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
501 sc = fsp->cmd;
502
503 remaining = seq_blen;
504 fh_parm_offset = frame_offset = offset;
505 tlen = 0;
506 seq = lp->tt.seq_start_next(seq);
507 f_ctl = FC_FC_REL_OFF;
508 WARN_ON(!seq);
509
510 /*
511 * If a get_page()/put_page() will fail, don't use sg lists
512 * in the fc_frame structure.
513 *
514 * The put_page() may be long after the I/O has completed
515 * in the case of FCoE, since the network driver does it
516 * via free_skb(). See the test in free_pages_check().
517 *
518 * Test this case with 'dd </dev/zero >/dev/st0 bs=64k'.
519 */
520 if (using_sg) {
521 for (sg = scsi_sglist(sc); sg; sg = sg_next(sg)) {
522 if (page_count(sg_page(sg)) == 0 ||
523 (sg_page(sg)->flags & (1 << PG_lru |
524 1 << PG_private |
525 1 << PG_locked |
526 1 << PG_active |
527 1 << PG_slab |
528 1 << PG_swapcache |
529 1 << PG_writeback |
530 1 << PG_reserved |
531 1 << PG_buddy))) {
532 using_sg = 0;
533 break;
534 }
535 }
536 }
537 sg = scsi_sglist(sc);
538
539 while (remaining > 0 && sg) {
540 if (offset >= sg->length) {
541 offset -= sg->length;
542 sg = sg_next(sg);
543 continue;
544 }
545 if (!fp) {
546 tlen = min(t_blen, remaining);
547
548 /*
549 * TODO. Temporary workaround. fc_seq_send() can't
550 * handle odd lengths in non-linear skbs.
551 * This will be the final fragment only.
552 */
553 if (tlen % 4)
554 using_sg = 0;
555 if (using_sg) {
556 fp = _fc_frame_alloc(lp, 0);
557 if (!fp)
558 return -ENOMEM;
559 } else {
560 fp = fc_frame_alloc(lp, tlen);
561 if (!fp)
562 return -ENOMEM;
563
564 data = (void *)(fr_hdr(fp)) +
565 sizeof(struct fc_frame_header);
566 }
567 fh_parm_offset = frame_offset;
568 fr_max_payload(fp) = fsp->max_payload;
569 }
570 sg_bytes = min(tlen, sg->length - offset);
571 if (using_sg) {
572 WARN_ON(skb_shinfo(fp_skb(fp))->nr_frags >
573 FC_FRAME_SG_LEN);
574 get_page(sg_page(sg));
575 skb_fill_page_desc(fp_skb(fp),
576 skb_shinfo(fp_skb(fp))->nr_frags,
577 sg_page(sg), sg->offset + offset,
578 sg_bytes);
579 fp_skb(fp)->data_len += sg_bytes;
580 fr_len(fp) += sg_bytes;
581 fp_skb(fp)->truesize += PAGE_SIZE;
582 } else {
583 size_t off = offset + sg->offset;
584
585 /*
586 * The scatterlist item may be bigger than PAGE_SIZE,
587 * but we must not cross pages inside the kmap.
588 */
589 sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE -
590 (off & ~PAGE_MASK)));
591 page_addr = kmap_atomic(sg_page(sg) +
592 (off >> PAGE_SHIFT),
593 KM_SOFTIRQ0);
594 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
595 sg_bytes);
596 kunmap_atomic(page_addr, KM_SOFTIRQ0);
597 data += sg_bytes;
598 }
599 offset += sg_bytes;
600 frame_offset += sg_bytes;
601 tlen -= sg_bytes;
602 remaining -= sg_bytes;
603
604 if (tlen)
605 continue;
606
607 /*
608 * Send sequence with transfer sequence initiative in case
609 * this is last FCP frame of the sequence.
610 */
611 if (remaining == 0)
612 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
613
614 ep = fc_seq_exch(seq);
615 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
616 FC_TYPE_FCP, f_ctl, fh_parm_offset);
617
618 /*
619 * send fragment using for a sequence.
620 */
621 error = lp->tt.seq_send(lp, seq, fp);
622 if (error) {
623 WARN_ON(1); /* send error should be rare */
624 fc_fcp_retry_cmd(fsp);
625 return 0;
626 }
627 fp = NULL;
628 }
629 fsp->xfer_len += seq_blen; /* premature count? */
630 return 0;
631 }
632
633 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
634 {
635 int ba_done = 1;
636 struct fc_ba_rjt *brp;
637 struct fc_frame_header *fh;
638
639 fh = fc_frame_header_get(fp);
640 switch (fh->fh_r_ctl) {
641 case FC_RCTL_BA_ACC:
642 break;
643 case FC_RCTL_BA_RJT:
644 brp = fc_frame_payload_get(fp, sizeof(*brp));
645 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
646 break;
647 /* fall thru */
648 default:
649 /*
650 * we will let the command timeout
651 * and scsi-ml recover in this case,
652 * therefore cleared the ba_done flag.
653 */
654 ba_done = 0;
655 }
656
657 if (ba_done) {
658 fsp->state |= FC_SRB_ABORTED;
659 fsp->state &= ~FC_SRB_ABORT_PENDING;
660
661 if (fsp->wait_for_comp)
662 complete(&fsp->tm_done);
663 else
664 fc_fcp_complete_locked(fsp);
665 }
666 }
667
668 /**
669 * fc_fcp_reduce_can_queue() - drop can_queue
670 * @lp: lport to drop queueing for
671 *
672 * If we are getting memory allocation failures, then we may
673 * be trying to execute too many commands. We let the running
674 * commands complete or timeout, then try again with a reduced
675 * can_queue. Eventually we will hit the point where we run
676 * on all reserved structs.
677 */
678 static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
679 {
680 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
681 unsigned long flags;
682 int can_queue;
683
684 spin_lock_irqsave(lp->host->host_lock, flags);
685 if (si->throttled)
686 goto done;
687 si->throttled = 1;
688
689 can_queue = lp->host->can_queue;
690 can_queue >>= 1;
691 if (!can_queue)
692 can_queue = 1;
693 lp->host->can_queue = can_queue;
694 shost_printk(KERN_ERR, lp->host, "libfc: Could not allocate frame.\n"
695 "Reducing can_queue to %d.\n", can_queue);
696 done:
697 spin_unlock_irqrestore(lp->host->host_lock, flags);
698 }
699
700 /**
701 * fc_fcp_recv() - Reveive FCP frames
702 * @seq: The sequence the frame is on
703 * @fp: The FC frame
704 * @arg: The related FCP packet
705 *
706 * Return : None
707 * Context : called from Soft IRQ context
708 * can not called holding list lock
709 */
710 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
711 {
712 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
713 struct fc_lport *lport = fsp->lp;
714 struct fc_frame_header *fh;
715 struct fcp_txrdy *dd;
716 u8 r_ctl;
717 int rc = 0;
718
719 if (IS_ERR(fp))
720 goto errout;
721
722 fh = fc_frame_header_get(fp);
723 r_ctl = fh->fh_r_ctl;
724
725 if (!(lport->state & LPORT_ST_READY))
726 goto out;
727 if (fc_fcp_lock_pkt(fsp))
728 goto out;
729 fsp->last_pkt_time = jiffies;
730
731 if (fh->fh_type == FC_TYPE_BLS) {
732 fc_fcp_abts_resp(fsp, fp);
733 goto unlock;
734 }
735
736 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
737 goto unlock;
738
739 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
740 /*
741 * received XFER RDY from the target
742 * need to send data to the target
743 */
744 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
745 dd = fc_frame_payload_get(fp, sizeof(*dd));
746 WARN_ON(!dd);
747
748 rc = fc_fcp_send_data(fsp, seq,
749 (size_t) ntohl(dd->ft_data_ro),
750 (size_t) ntohl(dd->ft_burst_len));
751 if (!rc)
752 seq->rec_data = fsp->xfer_len;
753 else if (rc == -ENOMEM)
754 fsp->state |= FC_SRB_NOMEM;
755 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
756 /*
757 * received a DATA frame
758 * next we will copy the data to the system buffer
759 */
760 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
761 fc_fcp_recv_data(fsp, fp);
762 seq->rec_data = fsp->xfer_contig_end;
763 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
764 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
765
766 fc_fcp_resp(fsp, fp);
767 } else {
768 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
769 }
770 unlock:
771 fc_fcp_unlock_pkt(fsp);
772 out:
773 fc_frame_free(fp);
774 errout:
775 if (IS_ERR(fp))
776 fc_fcp_error(fsp, fp);
777 else if (rc == -ENOMEM)
778 fc_fcp_reduce_can_queue(lport);
779 }
780
781 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
782 {
783 struct fc_frame_header *fh;
784 struct fcp_resp *fc_rp;
785 struct fcp_resp_ext *rp_ex;
786 struct fcp_resp_rsp_info *fc_rp_info;
787 u32 plen;
788 u32 expected_len;
789 u32 respl = 0;
790 u32 snsl = 0;
791 u8 flags = 0;
792
793 plen = fr_len(fp);
794 fh = (struct fc_frame_header *)fr_hdr(fp);
795 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
796 goto len_err;
797 plen -= sizeof(*fh);
798 fc_rp = (struct fcp_resp *)(fh + 1);
799 fsp->cdb_status = fc_rp->fr_status;
800 flags = fc_rp->fr_flags;
801 fsp->scsi_comp_flags = flags;
802 expected_len = fsp->data_len;
803
804 /* if ddp, update xfer len */
805 fc_fcp_ddp_done(fsp);
806
807 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
808 rp_ex = (void *)(fc_rp + 1);
809 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
810 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
811 goto len_err;
812 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
813 if (flags & FCP_RSP_LEN_VAL) {
814 respl = ntohl(rp_ex->fr_rsp_len);
815 if (respl != sizeof(*fc_rp_info))
816 goto len_err;
817 if (fsp->wait_for_comp) {
818 /* Abuse cdb_status for rsp code */
819 fsp->cdb_status = fc_rp_info->rsp_code;
820 complete(&fsp->tm_done);
821 /*
822 * tmfs will not have any scsi cmd so
823 * exit here
824 */
825 return;
826 } else
827 goto err;
828 }
829 if (flags & FCP_SNS_LEN_VAL) {
830 snsl = ntohl(rp_ex->fr_sns_len);
831 if (snsl > SCSI_SENSE_BUFFERSIZE)
832 snsl = SCSI_SENSE_BUFFERSIZE;
833 memcpy(fsp->cmd->sense_buffer,
834 (char *)fc_rp_info + respl, snsl);
835 }
836 }
837 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
838 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
839 goto len_err;
840 if (flags & FCP_RESID_UNDER) {
841 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
842 /*
843 * The cmnd->underflow is the minimum number of
844 * bytes that must be transfered for this
845 * command. Provided a sense condition is not
846 * present, make sure the actual amount
847 * transferred is at least the underflow value
848 * or fail.
849 */
850 if (!(flags & FCP_SNS_LEN_VAL) &&
851 (fc_rp->fr_status == 0) &&
852 (scsi_bufflen(fsp->cmd) -
853 fsp->scsi_resid) < fsp->cmd->underflow)
854 goto err;
855 expected_len -= fsp->scsi_resid;
856 } else {
857 fsp->status_code = FC_ERROR;
858 }
859 }
860 }
861 fsp->state |= FC_SRB_RCV_STATUS;
862
863 /*
864 * Check for missing or extra data frames.
865 */
866 if (unlikely(fsp->xfer_len != expected_len)) {
867 if (fsp->xfer_len < expected_len) {
868 /*
869 * Some data may be queued locally,
870 * Wait a at least one jiffy to see if it is delivered.
871 * If this expires without data, we may do SRR.
872 */
873 fc_fcp_timer_set(fsp, 2);
874 return;
875 }
876 fsp->status_code = FC_DATA_OVRRUN;
877 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, "
878 "len %x, data len %x\n",
879 fsp->rport->port_id,
880 fsp->xfer_len, expected_len, fsp->data_len);
881 }
882 fc_fcp_complete_locked(fsp);
883 return;
884
885 len_err:
886 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
887 "snsl %u\n", flags, fr_len(fp), respl, snsl);
888 err:
889 fsp->status_code = FC_ERROR;
890 fc_fcp_complete_locked(fsp);
891 }
892
893 /**
894 * fc_fcp_complete_locked() - complete processing of a fcp packet
895 * @fsp: fcp packet
896 *
897 * This function may sleep if a timer is pending. The packet lock must be
898 * held, and the host lock must not be held.
899 */
900 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
901 {
902 struct fc_lport *lp = fsp->lp;
903 struct fc_seq *seq;
904 struct fc_exch *ep;
905 u32 f_ctl;
906
907 if (fsp->state & FC_SRB_ABORT_PENDING)
908 return;
909
910 if (fsp->state & FC_SRB_ABORTED) {
911 if (!fsp->status_code)
912 fsp->status_code = FC_CMD_ABORTED;
913 } else {
914 /*
915 * Test for transport underrun, independent of response
916 * underrun status.
917 */
918 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
919 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
920 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
921 fsp->status_code = FC_DATA_UNDRUN;
922 fsp->io_status = 0;
923 }
924 }
925
926 seq = fsp->seq_ptr;
927 if (seq) {
928 fsp->seq_ptr = NULL;
929 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
930 struct fc_frame *conf_frame;
931 struct fc_seq *csp;
932
933 csp = lp->tt.seq_start_next(seq);
934 conf_frame = fc_frame_alloc(fsp->lp, 0);
935 if (conf_frame) {
936 f_ctl = FC_FC_SEQ_INIT;
937 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
938 ep = fc_seq_exch(seq);
939 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
940 ep->did, ep->sid,
941 FC_TYPE_FCP, f_ctl, 0);
942 lp->tt.seq_send(lp, csp, conf_frame);
943 }
944 }
945 lp->tt.exch_done(seq);
946 }
947 fc_io_compl(fsp);
948 }
949
950 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
951 {
952 struct fc_lport *lp = fsp->lp;
953
954 if (fsp->seq_ptr) {
955 lp->tt.exch_done(fsp->seq_ptr);
956 fsp->seq_ptr = NULL;
957 }
958 fsp->status_code = error;
959 }
960
961 /**
962 * fc_fcp_cleanup_each_cmd() - Cleanup active commads
963 * @lp: logical port
964 * @id: target id
965 * @lun: lun
966 * @error: fsp status code
967 *
968 * If lun or id is -1, they are ignored.
969 */
970 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
971 unsigned int lun, int error)
972 {
973 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
974 struct fc_fcp_pkt *fsp;
975 struct scsi_cmnd *sc_cmd;
976 unsigned long flags;
977
978 spin_lock_irqsave(lp->host->host_lock, flags);
979 restart:
980 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
981 sc_cmd = fsp->cmd;
982 if (id != -1 && scmd_id(sc_cmd) != id)
983 continue;
984
985 if (lun != -1 && sc_cmd->device->lun != lun)
986 continue;
987
988 fc_fcp_pkt_hold(fsp);
989 spin_unlock_irqrestore(lp->host->host_lock, flags);
990
991 if (!fc_fcp_lock_pkt(fsp)) {
992 fc_fcp_cleanup_cmd(fsp, error);
993 fc_io_compl(fsp);
994 fc_fcp_unlock_pkt(fsp);
995 }
996
997 fc_fcp_pkt_release(fsp);
998 spin_lock_irqsave(lp->host->host_lock, flags);
999 /*
1000 * while we dropped the lock multiple pkts could
1001 * have been released, so we have to start over.
1002 */
1003 goto restart;
1004 }
1005 spin_unlock_irqrestore(lp->host->host_lock, flags);
1006 }
1007
1008 static void fc_fcp_abort_io(struct fc_lport *lp)
1009 {
1010 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
1011 }
1012
1013 /**
1014 * fc_fcp_pkt_send() - send a fcp packet to the lower level.
1015 * @lp: fc lport
1016 * @fsp: fc packet.
1017 *
1018 * This is called by upper layer protocol.
1019 * Return : zero for success and -1 for failure
1020 * Context : called from queuecommand which can be called from process
1021 * or scsi soft irq.
1022 * Locks : called with the host lock and irqs disabled.
1023 */
1024 static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
1025 {
1026 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
1027 int rc;
1028
1029 fsp->cmd->SCp.ptr = (char *)fsp;
1030 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1031 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1032
1033 int_to_scsilun(fsp->cmd->device->lun,
1034 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1035 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1036 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1037
1038 spin_unlock_irq(lp->host->host_lock);
1039 rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv);
1040 spin_lock_irq(lp->host->host_lock);
1041 if (rc)
1042 list_del(&fsp->list);
1043
1044 return rc;
1045 }
1046
1047 static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1048 void (*resp)(struct fc_seq *,
1049 struct fc_frame *fp,
1050 void *arg))
1051 {
1052 struct fc_frame *fp;
1053 struct fc_seq *seq;
1054 struct fc_rport *rport;
1055 struct fc_rport_libfc_priv *rp;
1056 const size_t len = sizeof(fsp->cdb_cmd);
1057 int rc = 0;
1058
1059 if (fc_fcp_lock_pkt(fsp))
1060 return 0;
1061
1062 fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
1063 if (!fp) {
1064 rc = -1;
1065 goto unlock;
1066 }
1067
1068 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1069 fr_fsp(fp) = fsp;
1070 rport = fsp->rport;
1071 fsp->max_payload = rport->maxframe_size;
1072 rp = rport->dd_data;
1073
1074 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1075 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1076 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1077
1078 seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1079 if (!seq) {
1080 fc_frame_free(fp);
1081 rc = -1;
1082 goto unlock;
1083 }
1084 fsp->last_pkt_time = jiffies;
1085 fsp->seq_ptr = seq;
1086 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1087
1088 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1089 fc_fcp_timer_set(fsp,
1090 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1091 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1092 unlock:
1093 fc_fcp_unlock_pkt(fsp);
1094 return rc;
1095 }
1096
1097 /*
1098 * transport error handler
1099 */
1100 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1101 {
1102 int error = PTR_ERR(fp);
1103
1104 if (fc_fcp_lock_pkt(fsp))
1105 return;
1106
1107 if (error == -FC_EX_CLOSED) {
1108 fc_fcp_retry_cmd(fsp);
1109 goto unlock;
1110 }
1111
1112 /*
1113 * clear abort pending, because the lower layer
1114 * decided to force completion.
1115 */
1116 fsp->state &= ~FC_SRB_ABORT_PENDING;
1117 fsp->status_code = FC_CMD_PLOGO;
1118 fc_fcp_complete_locked(fsp);
1119 unlock:
1120 fc_fcp_unlock_pkt(fsp);
1121 }
1122
1123 /*
1124 * Scsi abort handler- calls to send an abort
1125 * and then wait for abort completion
1126 */
1127 static int fc_fcp_pkt_abort(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
1128 {
1129 int rc = FAILED;
1130
1131 if (fc_fcp_send_abort(fsp))
1132 return FAILED;
1133
1134 init_completion(&fsp->tm_done);
1135 fsp->wait_for_comp = 1;
1136
1137 spin_unlock_bh(&fsp->scsi_pkt_lock);
1138 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1139 spin_lock_bh(&fsp->scsi_pkt_lock);
1140 fsp->wait_for_comp = 0;
1141
1142 if (!rc) {
1143 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1144 rc = FAILED;
1145 } else if (fsp->state & FC_SRB_ABORTED) {
1146 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1147 rc = SUCCESS;
1148 fc_fcp_complete_locked(fsp);
1149 }
1150
1151 return rc;
1152 }
1153
1154 /*
1155 * Retry LUN reset after resource allocation failed.
1156 */
1157 static void fc_lun_reset_send(unsigned long data)
1158 {
1159 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1160 struct fc_lport *lp = fsp->lp;
1161 if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) {
1162 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1163 return;
1164 if (fc_fcp_lock_pkt(fsp))
1165 return;
1166 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1167 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1168 fc_fcp_unlock_pkt(fsp);
1169 }
1170 }
1171
1172 /*
1173 * Scsi device reset handler- send a LUN RESET to the device
1174 * and wait for reset reply
1175 */
1176 static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1177 unsigned int id, unsigned int lun)
1178 {
1179 int rc;
1180
1181 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1182 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1183 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1184
1185 fsp->wait_for_comp = 1;
1186 init_completion(&fsp->tm_done);
1187
1188 fc_lun_reset_send((unsigned long)fsp);
1189
1190 /*
1191 * wait for completion of reset
1192 * after that make sure all commands are terminated
1193 */
1194 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1195
1196 spin_lock_bh(&fsp->scsi_pkt_lock);
1197 fsp->state |= FC_SRB_COMPL;
1198 spin_unlock_bh(&fsp->scsi_pkt_lock);
1199
1200 del_timer_sync(&fsp->timer);
1201
1202 spin_lock_bh(&fsp->scsi_pkt_lock);
1203 if (fsp->seq_ptr) {
1204 lp->tt.exch_done(fsp->seq_ptr);
1205 fsp->seq_ptr = NULL;
1206 }
1207 fsp->wait_for_comp = 0;
1208 spin_unlock_bh(&fsp->scsi_pkt_lock);
1209
1210 if (!rc) {
1211 FC_SCSI_DBG(lp, "lun reset failed\n");
1212 return FAILED;
1213 }
1214
1215 /* cdb_status holds the tmf's rsp code */
1216 if (fsp->cdb_status != FCP_TMF_CMPL)
1217 return FAILED;
1218
1219 FC_SCSI_DBG(lp, "lun reset to lun %u completed\n", lun);
1220 fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED);
1221 return SUCCESS;
1222 }
1223
1224 /*
1225 * Task Managment response handler
1226 */
1227 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1228 {
1229 struct fc_fcp_pkt *fsp = arg;
1230 struct fc_frame_header *fh;
1231
1232 if (IS_ERR(fp)) {
1233 /*
1234 * If there is an error just let it timeout or wait
1235 * for TMF to be aborted if it timedout.
1236 *
1237 * scsi-eh will escalate for when either happens.
1238 */
1239 return;
1240 }
1241
1242 if (fc_fcp_lock_pkt(fsp))
1243 return;
1244
1245 /*
1246 * raced with eh timeout handler.
1247 */
1248 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1249 spin_unlock_bh(&fsp->scsi_pkt_lock);
1250 return;
1251 }
1252
1253 fh = fc_frame_header_get(fp);
1254 if (fh->fh_type != FC_TYPE_BLS)
1255 fc_fcp_resp(fsp, fp);
1256 fsp->seq_ptr = NULL;
1257 fsp->lp->tt.exch_done(seq);
1258 fc_frame_free(fp);
1259 fc_fcp_unlock_pkt(fsp);
1260 }
1261
1262 static void fc_fcp_cleanup(struct fc_lport *lp)
1263 {
1264 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
1265 }
1266
1267 /*
1268 * fc_fcp_timeout: called by OS timer function.
1269 *
1270 * The timer has been inactivated and must be reactivated if desired
1271 * using fc_fcp_timer_set().
1272 *
1273 * Algorithm:
1274 *
1275 * If REC is supported, just issue it, and return. The REC exchange will
1276 * complete or time out, and recovery can continue at that point.
1277 *
1278 * Otherwise, if the response has been received without all the data,
1279 * it has been ER_TIMEOUT since the response was received.
1280 *
1281 * If the response has not been received,
1282 * we see if data was received recently. If it has been, we continue waiting,
1283 * otherwise, we abort the command.
1284 */
1285 static void fc_fcp_timeout(unsigned long data)
1286 {
1287 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1288 struct fc_rport *rport = fsp->rport;
1289 struct fc_rport_libfc_priv *rp = rport->dd_data;
1290
1291 if (fc_fcp_lock_pkt(fsp))
1292 return;
1293
1294 if (fsp->cdb_cmd.fc_tm_flags)
1295 goto unlock;
1296
1297 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1298
1299 if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
1300 fc_fcp_rec(fsp);
1301 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1302 jiffies))
1303 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1304 else if (fsp->state & FC_SRB_RCV_STATUS)
1305 fc_fcp_complete_locked(fsp);
1306 else
1307 fc_timeout_error(fsp);
1308 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1309 unlock:
1310 fc_fcp_unlock_pkt(fsp);
1311 }
1312
1313 /*
1314 * Send a REC ELS request
1315 */
1316 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1317 {
1318 struct fc_lport *lp;
1319 struct fc_frame *fp;
1320 struct fc_rport *rport;
1321 struct fc_rport_libfc_priv *rp;
1322
1323 lp = fsp->lp;
1324 rport = fsp->rport;
1325 rp = rport->dd_data;
1326 if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) {
1327 fsp->status_code = FC_HRD_ERROR;
1328 fsp->io_status = 0;
1329 fc_fcp_complete_locked(fsp);
1330 return;
1331 }
1332 fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec));
1333 if (!fp)
1334 goto retry;
1335
1336 fr_seq(fp) = fsp->seq_ptr;
1337 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1338 fc_host_port_id(rp->local_port->host), FC_TYPE_ELS,
1339 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1340 if (lp->tt.elsct_send(lp, rport, fp, ELS_REC, fc_fcp_rec_resp,
1341 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1342 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1343 return;
1344 }
1345 fc_frame_free(fp);
1346 retry:
1347 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1348 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1349 else
1350 fc_timeout_error(fsp);
1351 }
1352
1353 /*
1354 * Receive handler for REC ELS frame
1355 * if it is a reject then let the scsi layer to handle
1356 * the timeout. if it is a LS_ACC then if the io was not completed
1357 * then set the timeout and return otherwise complete the exchange
1358 * and tell the scsi layer to restart the I/O.
1359 */
1360 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1361 {
1362 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1363 struct fc_els_rec_acc *recp;
1364 struct fc_els_ls_rjt *rjt;
1365 u32 e_stat;
1366 u8 opcode;
1367 u32 offset;
1368 enum dma_data_direction data_dir;
1369 enum fc_rctl r_ctl;
1370 struct fc_rport_libfc_priv *rp;
1371
1372 if (IS_ERR(fp)) {
1373 fc_fcp_rec_error(fsp, fp);
1374 return;
1375 }
1376
1377 if (fc_fcp_lock_pkt(fsp))
1378 goto out;
1379
1380 fsp->recov_retry = 0;
1381 opcode = fc_frame_payload_op(fp);
1382 if (opcode == ELS_LS_RJT) {
1383 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1384 switch (rjt->er_reason) {
1385 default:
1386 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1387 "reason %d expl %d\n",
1388 fsp->rport->port_id, rjt->er_reason,
1389 rjt->er_explan);
1390 /* fall through */
1391 case ELS_RJT_UNSUP:
1392 FC_FCP_DBG(fsp, "device does not support REC\n");
1393 rp = fsp->rport->dd_data;
1394 /*
1395 * if we do not spport RECs or got some bogus
1396 * reason then resetup timer so we check for
1397 * making progress.
1398 */
1399 rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1400 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1401 break;
1402 case ELS_RJT_LOGIC:
1403 case ELS_RJT_UNAB:
1404 /*
1405 * If no data transfer, the command frame got dropped
1406 * so we just retry. If data was transferred, we
1407 * lost the response but the target has no record,
1408 * so we abort and retry.
1409 */
1410 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1411 fsp->xfer_len == 0) {
1412 fc_fcp_retry_cmd(fsp);
1413 break;
1414 }
1415 fc_timeout_error(fsp);
1416 break;
1417 }
1418 } else if (opcode == ELS_LS_ACC) {
1419 if (fsp->state & FC_SRB_ABORTED)
1420 goto unlock_out;
1421
1422 data_dir = fsp->cmd->sc_data_direction;
1423 recp = fc_frame_payload_get(fp, sizeof(*recp));
1424 offset = ntohl(recp->reca_fc4value);
1425 e_stat = ntohl(recp->reca_e_stat);
1426
1427 if (e_stat & ESB_ST_COMPLETE) {
1428
1429 /*
1430 * The exchange is complete.
1431 *
1432 * For output, we must've lost the response.
1433 * For input, all data must've been sent.
1434 * We lost may have lost the response
1435 * (and a confirmation was requested) and maybe
1436 * some data.
1437 *
1438 * If all data received, send SRR
1439 * asking for response. If partial data received,
1440 * or gaps, SRR requests data at start of gap.
1441 * Recovery via SRR relies on in-order-delivery.
1442 */
1443 if (data_dir == DMA_TO_DEVICE) {
1444 r_ctl = FC_RCTL_DD_CMD_STATUS;
1445 } else if (fsp->xfer_contig_end == offset) {
1446 r_ctl = FC_RCTL_DD_CMD_STATUS;
1447 } else {
1448 offset = fsp->xfer_contig_end;
1449 r_ctl = FC_RCTL_DD_SOL_DATA;
1450 }
1451 fc_fcp_srr(fsp, r_ctl, offset);
1452 } else if (e_stat & ESB_ST_SEQ_INIT) {
1453
1454 /*
1455 * The remote port has the initiative, so just
1456 * keep waiting for it to complete.
1457 */
1458 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1459 } else {
1460
1461 /*
1462 * The exchange is incomplete, we have seq. initiative.
1463 * Lost response with requested confirmation,
1464 * lost confirmation, lost transfer ready or
1465 * lost write data.
1466 *
1467 * For output, if not all data was received, ask
1468 * for transfer ready to be repeated.
1469 *
1470 * If we received or sent all the data, send SRR to
1471 * request response.
1472 *
1473 * If we lost a response, we may have lost some read
1474 * data as well.
1475 */
1476 r_ctl = FC_RCTL_DD_SOL_DATA;
1477 if (data_dir == DMA_TO_DEVICE) {
1478 r_ctl = FC_RCTL_DD_CMD_STATUS;
1479 if (offset < fsp->data_len)
1480 r_ctl = FC_RCTL_DD_DATA_DESC;
1481 } else if (offset == fsp->xfer_contig_end) {
1482 r_ctl = FC_RCTL_DD_CMD_STATUS;
1483 } else if (fsp->xfer_contig_end < offset) {
1484 offset = fsp->xfer_contig_end;
1485 }
1486 fc_fcp_srr(fsp, r_ctl, offset);
1487 }
1488 }
1489 unlock_out:
1490 fc_fcp_unlock_pkt(fsp);
1491 out:
1492 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1493 fc_frame_free(fp);
1494 }
1495
1496 /*
1497 * Handle error response or timeout for REC exchange.
1498 */
1499 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1500 {
1501 int error = PTR_ERR(fp);
1502
1503 if (fc_fcp_lock_pkt(fsp))
1504 goto out;
1505
1506 switch (error) {
1507 case -FC_EX_CLOSED:
1508 fc_fcp_retry_cmd(fsp);
1509 break;
1510
1511 default:
1512 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
1513 fsp, fsp->rport->port_id, error);
1514 fsp->status_code = FC_CMD_PLOGO;
1515 /* fall through */
1516
1517 case -FC_EX_TIMEOUT:
1518 /*
1519 * Assume REC or LS_ACC was lost.
1520 * The exchange manager will have aborted REC, so retry.
1521 */
1522 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n",
1523 fsp->rport->port_id, error, fsp->recov_retry,
1524 FC_MAX_RECOV_RETRY);
1525 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1526 fc_fcp_rec(fsp);
1527 else
1528 fc_timeout_error(fsp);
1529 break;
1530 }
1531 fc_fcp_unlock_pkt(fsp);
1532 out:
1533 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1534 }
1535
1536 /*
1537 * Time out error routine:
1538 * abort's the I/O close the exchange and
1539 * send completion notification to scsi layer
1540 */
1541 static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1542 {
1543 fsp->status_code = FC_CMD_TIME_OUT;
1544 fsp->cdb_status = 0;
1545 fsp->io_status = 0;
1546 /*
1547 * if this fails then we let the scsi command timer fire and
1548 * scsi-ml escalate.
1549 */
1550 fc_fcp_send_abort(fsp);
1551 }
1552
1553 /*
1554 * Sequence retransmission request.
1555 * This is called after receiving status but insufficient data, or
1556 * when expecting status but the request has timed out.
1557 */
1558 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1559 {
1560 struct fc_lport *lp = fsp->lp;
1561 struct fc_rport *rport;
1562 struct fc_rport_libfc_priv *rp;
1563 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1564 struct fc_seq *seq;
1565 struct fcp_srr *srr;
1566 struct fc_frame *fp;
1567 u8 cdb_op;
1568
1569 rport = fsp->rport;
1570 rp = rport->dd_data;
1571 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1572
1573 if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
1574 goto retry; /* shouldn't happen */
1575 fp = fc_frame_alloc(lp, sizeof(*srr));
1576 if (!fp)
1577 goto retry;
1578
1579 srr = fc_frame_payload_get(fp, sizeof(*srr));
1580 memset(srr, 0, sizeof(*srr));
1581 srr->srr_op = ELS_SRR;
1582 srr->srr_ox_id = htons(ep->oxid);
1583 srr->srr_rx_id = htons(ep->rxid);
1584 srr->srr_r_ctl = r_ctl;
1585 srr->srr_rel_off = htonl(offset);
1586
1587 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1588 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1589 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1590
1591 seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL,
1592 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1593 if (!seq) {
1594 fc_frame_free(fp);
1595 goto retry;
1596 }
1597 fsp->recov_seq = seq;
1598 fsp->xfer_len = offset;
1599 fsp->xfer_contig_end = offset;
1600 fsp->state &= ~FC_SRB_RCV_STATUS;
1601 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1602 return;
1603 retry:
1604 fc_fcp_retry_cmd(fsp);
1605 }
1606
1607 /*
1608 * Handle response from SRR.
1609 */
1610 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1611 {
1612 struct fc_fcp_pkt *fsp = arg;
1613 struct fc_frame_header *fh;
1614
1615 if (IS_ERR(fp)) {
1616 fc_fcp_srr_error(fsp, fp);
1617 return;
1618 }
1619
1620 if (fc_fcp_lock_pkt(fsp))
1621 goto out;
1622
1623 fh = fc_frame_header_get(fp);
1624 /*
1625 * BUG? fc_fcp_srr_error calls exch_done which would release
1626 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1627 * then fc_exch_timeout would be sending an abort. The exch_done
1628 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1629 * an abort response though.
1630 */
1631 if (fh->fh_type == FC_TYPE_BLS) {
1632 fc_fcp_unlock_pkt(fsp);
1633 return;
1634 }
1635
1636 fsp->recov_seq = NULL;
1637 switch (fc_frame_payload_op(fp)) {
1638 case ELS_LS_ACC:
1639 fsp->recov_retry = 0;
1640 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1641 break;
1642 case ELS_LS_RJT:
1643 default:
1644 fc_timeout_error(fsp);
1645 break;
1646 }
1647 fc_fcp_unlock_pkt(fsp);
1648 fsp->lp->tt.exch_done(seq);
1649 out:
1650 fc_frame_free(fp);
1651 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1652 }
1653
1654 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1655 {
1656 if (fc_fcp_lock_pkt(fsp))
1657 goto out;
1658 fsp->lp->tt.exch_done(fsp->recov_seq);
1659 fsp->recov_seq = NULL;
1660 switch (PTR_ERR(fp)) {
1661 case -FC_EX_TIMEOUT:
1662 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1663 fc_fcp_rec(fsp);
1664 else
1665 fc_timeout_error(fsp);
1666 break;
1667 case -FC_EX_CLOSED: /* e.g., link failure */
1668 /* fall through */
1669 default:
1670 fc_fcp_retry_cmd(fsp);
1671 break;
1672 }
1673 fc_fcp_unlock_pkt(fsp);
1674 out:
1675 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1676 }
1677
1678 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
1679 {
1680 /* lock ? */
1681 return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull;
1682 }
1683
1684 /**
1685 * fc_queuecommand - The queuecommand function of the scsi template
1686 * @cmd: struct scsi_cmnd to be executed
1687 * @done: Callback function to be called when cmd is completed
1688 *
1689 * this is the i/o strategy routine, called by the scsi layer
1690 * this routine is called with holding the host_lock.
1691 */
1692 int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1693 {
1694 struct fc_lport *lp;
1695 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1696 struct fc_fcp_pkt *fsp;
1697 struct fc_rport_libfc_priv *rp;
1698 int rval;
1699 int rc = 0;
1700 struct fcoe_dev_stats *stats;
1701
1702 lp = shost_priv(sc_cmd->device->host);
1703
1704 rval = fc_remote_port_chkready(rport);
1705 if (rval) {
1706 sc_cmd->result = rval;
1707 done(sc_cmd);
1708 goto out;
1709 }
1710
1711 if (!*(struct fc_remote_port **)rport->dd_data) {
1712 /*
1713 * rport is transitioning from blocked/deleted to
1714 * online
1715 */
1716 sc_cmd->result = DID_IMM_RETRY << 16;
1717 done(sc_cmd);
1718 goto out;
1719 }
1720
1721 rp = rport->dd_data;
1722
1723 if (!fc_fcp_lport_queue_ready(lp)) {
1724 rc = SCSI_MLQUEUE_HOST_BUSY;
1725 goto out;
1726 }
1727
1728 fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
1729 if (fsp == NULL) {
1730 rc = SCSI_MLQUEUE_HOST_BUSY;
1731 goto out;
1732 }
1733
1734 /*
1735 * build the libfc request pkt
1736 */
1737 fsp->cmd = sc_cmd; /* save the cmd */
1738 fsp->lp = lp; /* save the softc ptr */
1739 fsp->rport = rport; /* set the remote port ptr */
1740 sc_cmd->scsi_done = done;
1741
1742 /*
1743 * set up the transfer length
1744 */
1745 fsp->data_len = scsi_bufflen(sc_cmd);
1746 fsp->xfer_len = 0;
1747
1748 /*
1749 * setup the data direction
1750 */
1751 stats = fc_lport_get_stats(lp);
1752 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1753 fsp->req_flags = FC_SRB_READ;
1754 stats->InputRequests++;
1755 stats->InputMegabytes = fsp->data_len;
1756 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1757 fsp->req_flags = FC_SRB_WRITE;
1758 stats->OutputRequests++;
1759 stats->OutputMegabytes = fsp->data_len;
1760 } else {
1761 fsp->req_flags = 0;
1762 stats->ControlRequests++;
1763 }
1764
1765 fsp->tgt_flags = rp->flags;
1766
1767 init_timer(&fsp->timer);
1768 fsp->timer.data = (unsigned long)fsp;
1769
1770 /*
1771 * send it to the lower layer
1772 * if we get -1 return then put the request in the pending
1773 * queue.
1774 */
1775 rval = fc_fcp_pkt_send(lp, fsp);
1776 if (rval != 0) {
1777 fsp->state = FC_SRB_FREE;
1778 fc_fcp_pkt_release(fsp);
1779 rc = SCSI_MLQUEUE_HOST_BUSY;
1780 }
1781 out:
1782 return rc;
1783 }
1784 EXPORT_SYMBOL(fc_queuecommand);
1785
1786 /**
1787 * fc_io_compl() - Handle responses for completed commands
1788 * @fsp: scsi packet
1789 *
1790 * Translates a error to a Linux SCSI error.
1791 *
1792 * The fcp packet lock must be held when calling.
1793 */
1794 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1795 {
1796 struct fc_fcp_internal *si;
1797 struct scsi_cmnd *sc_cmd;
1798 struct fc_lport *lp;
1799 unsigned long flags;
1800
1801 /* release outstanding ddp context */
1802 fc_fcp_ddp_done(fsp);
1803
1804 fsp->state |= FC_SRB_COMPL;
1805 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1806 spin_unlock_bh(&fsp->scsi_pkt_lock);
1807 del_timer_sync(&fsp->timer);
1808 spin_lock_bh(&fsp->scsi_pkt_lock);
1809 }
1810
1811 lp = fsp->lp;
1812 si = fc_get_scsi_internal(lp);
1813 spin_lock_irqsave(lp->host->host_lock, flags);
1814 if (!fsp->cmd) {
1815 spin_unlock_irqrestore(lp->host->host_lock, flags);
1816 return;
1817 }
1818
1819 /*
1820 * if a command timed out while we had to try and throttle IO
1821 * and it is now getting cleaned up, then we are about to
1822 * try again so clear the throttled flag incase we get more
1823 * time outs.
1824 */
1825 if (si->throttled && fsp->state & FC_SRB_NOMEM)
1826 si->throttled = 0;
1827
1828 sc_cmd = fsp->cmd;
1829 fsp->cmd = NULL;
1830
1831 if (!sc_cmd->SCp.ptr) {
1832 spin_unlock_irqrestore(lp->host->host_lock, flags);
1833 return;
1834 }
1835
1836 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1837 switch (fsp->status_code) {
1838 case FC_COMPLETE:
1839 if (fsp->cdb_status == 0) {
1840 /*
1841 * good I/O status
1842 */
1843 sc_cmd->result = DID_OK << 16;
1844 if (fsp->scsi_resid)
1845 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1846 } else if (fsp->cdb_status == QUEUE_FULL) {
1847 struct scsi_device *tmp_sdev;
1848 struct scsi_device *sdev = sc_cmd->device;
1849
1850 shost_for_each_device(tmp_sdev, sdev->host) {
1851 if (tmp_sdev->id != sdev->id)
1852 continue;
1853
1854 if (tmp_sdev->queue_depth > 1) {
1855 scsi_track_queue_full(tmp_sdev,
1856 tmp_sdev->
1857 queue_depth - 1);
1858 }
1859 }
1860 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1861 } else {
1862 /*
1863 * transport level I/O was ok but scsi
1864 * has non zero status
1865 */
1866 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1867 }
1868 break;
1869 case FC_ERROR:
1870 sc_cmd->result = DID_ERROR << 16;
1871 break;
1872 case FC_DATA_UNDRUN:
1873 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1874 /*
1875 * scsi status is good but transport level
1876 * underrun.
1877 */
1878 sc_cmd->result = DID_OK << 16;
1879 } else {
1880 /*
1881 * scsi got underrun, this is an error
1882 */
1883 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1884 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1885 }
1886 break;
1887 case FC_DATA_OVRRUN:
1888 /*
1889 * overrun is an error
1890 */
1891 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1892 break;
1893 case FC_CMD_ABORTED:
1894 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1895 break;
1896 case FC_CMD_TIME_OUT:
1897 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1898 break;
1899 case FC_CMD_RESET:
1900 sc_cmd->result = (DID_RESET << 16);
1901 break;
1902 case FC_HRD_ERROR:
1903 sc_cmd->result = (DID_NO_CONNECT << 16);
1904 break;
1905 default:
1906 sc_cmd->result = (DID_ERROR << 16);
1907 break;
1908 }
1909
1910 list_del(&fsp->list);
1911 sc_cmd->SCp.ptr = NULL;
1912 sc_cmd->scsi_done(sc_cmd);
1913 spin_unlock_irqrestore(lp->host->host_lock, flags);
1914
1915 /* release ref from initial allocation in queue command */
1916 fc_fcp_pkt_release(fsp);
1917 }
1918
1919 /**
1920 * fc_fcp_complete() - complete processing of a fcp packet
1921 * @fsp: fcp packet
1922 *
1923 * This function may sleep if a fsp timer is pending.
1924 * The host lock must not be held by caller.
1925 */
1926 void fc_fcp_complete(struct fc_fcp_pkt *fsp)
1927 {
1928 if (fc_fcp_lock_pkt(fsp))
1929 return;
1930
1931 fc_fcp_complete_locked(fsp);
1932 fc_fcp_unlock_pkt(fsp);
1933 }
1934 EXPORT_SYMBOL(fc_fcp_complete);
1935
1936 /**
1937 * fc_eh_abort() - Abort a command
1938 * @sc_cmd: scsi command to abort
1939 *
1940 * From scsi host template.
1941 * send ABTS to the target device and wait for the response
1942 * sc_cmd is the pointer to the command to be aborted.
1943 */
1944 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1945 {
1946 struct fc_fcp_pkt *fsp;
1947 struct fc_lport *lp;
1948 int rc = FAILED;
1949 unsigned long flags;
1950
1951 lp = shost_priv(sc_cmd->device->host);
1952 if (lp->state != LPORT_ST_READY)
1953 return rc;
1954 else if (!lp->link_up)
1955 return rc;
1956
1957 spin_lock_irqsave(lp->host->host_lock, flags);
1958 fsp = CMD_SP(sc_cmd);
1959 if (!fsp) {
1960 /* command completed while scsi eh was setting up */
1961 spin_unlock_irqrestore(lp->host->host_lock, flags);
1962 return SUCCESS;
1963 }
1964 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1965 fc_fcp_pkt_hold(fsp);
1966 spin_unlock_irqrestore(lp->host->host_lock, flags);
1967
1968 if (fc_fcp_lock_pkt(fsp)) {
1969 /* completed while we were waiting for timer to be deleted */
1970 rc = SUCCESS;
1971 goto release_pkt;
1972 }
1973
1974 rc = fc_fcp_pkt_abort(lp, fsp);
1975 fc_fcp_unlock_pkt(fsp);
1976
1977 release_pkt:
1978 fc_fcp_pkt_release(fsp);
1979 return rc;
1980 }
1981 EXPORT_SYMBOL(fc_eh_abort);
1982
1983 /**
1984 * fc_eh_device_reset() Reset a single LUN
1985 * @sc_cmd: scsi command
1986 *
1987 * Set from scsi host template to send tm cmd to the target and wait for the
1988 * response.
1989 */
1990 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1991 {
1992 struct fc_lport *lp;
1993 struct fc_fcp_pkt *fsp;
1994 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1995 int rc = FAILED;
1996 struct fc_rport_libfc_priv *rp;
1997 int rval;
1998
1999 rval = fc_remote_port_chkready(rport);
2000 if (rval)
2001 goto out;
2002
2003 rp = rport->dd_data;
2004 lp = shost_priv(sc_cmd->device->host);
2005
2006 if (lp->state != LPORT_ST_READY)
2007 return rc;
2008
2009 FC_SCSI_DBG(lp, "Resetting rport (%6x)\n", rport->port_id);
2010
2011 fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
2012 if (fsp == NULL) {
2013 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2014 sc_cmd->result = DID_NO_CONNECT << 16;
2015 goto out;
2016 }
2017
2018 /*
2019 * Build the libfc request pkt. Do not set the scsi cmnd, because
2020 * the sc passed in is not setup for execution like when sent
2021 * through the queuecommand callout.
2022 */
2023 fsp->lp = lp; /* save the softc ptr */
2024 fsp->rport = rport; /* set the remote port ptr */
2025
2026 /*
2027 * flush outstanding commands
2028 */
2029 rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2030 fsp->state = FC_SRB_FREE;
2031 fc_fcp_pkt_release(fsp);
2032
2033 out:
2034 return rc;
2035 }
2036 EXPORT_SYMBOL(fc_eh_device_reset);
2037
2038 /**
2039 * fc_eh_host_reset() - The reset function will reset the ports on the host.
2040 * @sc_cmd: scsi command
2041 */
2042 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2043 {
2044 struct Scsi_Host *shost = sc_cmd->device->host;
2045 struct fc_lport *lp = shost_priv(shost);
2046 unsigned long wait_tmo;
2047
2048 FC_SCSI_DBG(lp, "Resetting host\n");
2049
2050 lp->tt.lport_reset(lp);
2051 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2052 while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
2053 msleep(1000);
2054
2055 if (fc_fcp_lport_queue_ready(lp)) {
2056 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2057 "on port (%6x)\n", fc_host_port_id(lp->host));
2058 return SUCCESS;
2059 } else {
2060 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2061 "port (%6x) is not ready.\n",
2062 fc_host_port_id(lp->host));
2063 return FAILED;
2064 }
2065 }
2066 EXPORT_SYMBOL(fc_eh_host_reset);
2067
2068 /**
2069 * fc_slave_alloc() - configure queue depth
2070 * @sdev: scsi device
2071 *
2072 * Configures queue depth based on host's cmd_per_len. If not set
2073 * then we use the libfc default.
2074 */
2075 int fc_slave_alloc(struct scsi_device *sdev)
2076 {
2077 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2078 int queue_depth;
2079
2080 if (!rport || fc_remote_port_chkready(rport))
2081 return -ENXIO;
2082
2083 if (sdev->tagged_supported) {
2084 if (sdev->host->hostt->cmd_per_lun)
2085 queue_depth = sdev->host->hostt->cmd_per_lun;
2086 else
2087 queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
2088 scsi_activate_tcq(sdev, queue_depth);
2089 }
2090 return 0;
2091 }
2092 EXPORT_SYMBOL(fc_slave_alloc);
2093
2094 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2095 {
2096 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2097 return sdev->queue_depth;
2098 }
2099 EXPORT_SYMBOL(fc_change_queue_depth);
2100
2101 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2102 {
2103 if (sdev->tagged_supported) {
2104 scsi_set_tag_type(sdev, tag_type);
2105 if (tag_type)
2106 scsi_activate_tcq(sdev, sdev->queue_depth);
2107 else
2108 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2109 } else
2110 tag_type = 0;
2111
2112 return tag_type;
2113 }
2114 EXPORT_SYMBOL(fc_change_queue_type);
2115
2116 void fc_fcp_destroy(struct fc_lport *lp)
2117 {
2118 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
2119
2120 if (!list_empty(&si->scsi_pkt_queue))
2121 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2122 "port (%6x)\n", fc_host_port_id(lp->host));
2123
2124 mempool_destroy(si->scsi_pkt_pool);
2125 kfree(si);
2126 lp->scsi_priv = NULL;
2127 }
2128 EXPORT_SYMBOL(fc_fcp_destroy);
2129
2130 int fc_fcp_init(struct fc_lport *lp)
2131 {
2132 int rc;
2133 struct fc_fcp_internal *si;
2134
2135 if (!lp->tt.fcp_cmd_send)
2136 lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
2137
2138 if (!lp->tt.fcp_cleanup)
2139 lp->tt.fcp_cleanup = fc_fcp_cleanup;
2140
2141 if (!lp->tt.fcp_abort_io)
2142 lp->tt.fcp_abort_io = fc_fcp_abort_io;
2143
2144 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2145 if (!si)
2146 return -ENOMEM;
2147 lp->scsi_priv = si;
2148 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2149
2150 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2151 if (!si->scsi_pkt_pool) {
2152 rc = -ENOMEM;
2153 goto free_internal;
2154 }
2155 return 0;
2156
2157 free_internal:
2158 kfree(si);
2159 return rc;
2160 }
2161 EXPORT_SYMBOL(fc_fcp_init);
2162
2163 static int __init libfc_init(void)
2164 {
2165 int rc;
2166
2167 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2168 sizeof(struct fc_fcp_pkt),
2169 0, SLAB_HWCACHE_ALIGN, NULL);
2170 if (scsi_pkt_cachep == NULL) {
2171 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2172 "module load failed!");
2173 return -ENOMEM;
2174 }
2175
2176 rc = fc_setup_exch_mgr();
2177 if (rc)
2178 goto destroy_pkt_cache;
2179
2180 rc = fc_setup_rport();
2181 if (rc)
2182 goto destroy_em;
2183
2184 return rc;
2185 destroy_em:
2186 fc_destroy_exch_mgr();
2187 destroy_pkt_cache:
2188 kmem_cache_destroy(scsi_pkt_cachep);
2189 return rc;
2190 }
2191
2192 static void __exit libfc_exit(void)
2193 {
2194 kmem_cache_destroy(scsi_pkt_cachep);
2195 fc_destroy_exch_mgr();
2196 fc_destroy_rport();
2197 }
2198
2199 module_init(libfc_init);
2200 module_exit(libfc_exit);
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