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[SCSI] libfc: convert to scsi_track_queue_full
[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");
9b34ecff 44MODULE_LICENSE("GPL v2");
42e9a92f 45
7414705e
RL		 46unsigned int fc_debug_logging;
47module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);
48MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
42e9a92f
RL		 49
50static 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
76struct 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 */
88static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
89static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
90static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
91static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
92static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
93static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp);
94static void fc_timeout_error(struct fc_fcp_pkt *);
95static void fc_fcp_timeout(unsigned long data);
96static void fc_fcp_rec(struct fc_fcp_pkt *);
97static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
98static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
99static void fc_io_compl(struct fc_fcp_pkt *);
100
101static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
102static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
103static 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 */
142static 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/**
34f42a07 160 * fc_fcp_pkt_release() - release hold on scsi_pkt packet
42e9a92f
RL		 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 */
167static 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
176static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
177{
178 atomic_inc(&fsp->ref_cnt);
179}
180
181/**
34f42a07 182 * fc_fcp_pkt_destory() - release hold on scsi_pkt packet
42e9a92f
RL		 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 */
191static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
192{
193 fc_fcp_pkt_release(fsp);
194}
195
196/**
34f42a07 197 * fc_fcp_lock_pkt() - lock a packet and get a ref to it.
42e9a92f
RL		 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 */
213static 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
225static 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
231static 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
237static 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 */
250static 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;
1c9fbafc 258 fsp->io_status = 0;
42e9a92f
RL		 259 fsp->status_code = FC_ERROR;
260 fc_fcp_complete_locked(fsp);
261}
262
b277d2aa
YZ		 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 */
273void 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}
b277d2aa
YZ		 288
289/*
290 * fc_fcp_ddp_done - calls to LLD's ddp_done to release any
291 * DDP related resources for this I/O if it is initialized
292 * as a ddp transfer
293 * @fsp: ptr to the fc_fcp_pkt
294 *
295 * returns: none
296 */
297static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
298{
299 struct fc_lport *lp;
300
301 if (!fsp)
302 return;
303
5e472d07
YZ		 304 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
305 return;
306
b277d2aa 307 lp = fsp->lp;
5e472d07 308 if (lp->tt.ddp_done) {
b277d2aa 309 fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp);
5e472d07 310 fsp->xfer_ddp = FC_XID_UNKNOWN;
b277d2aa
YZ		 311 }
312}
313
314
42e9a92f
RL		 315/*
316 * Receive SCSI data from target.
317 * Called after receiving solicited data.
318 */
319static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
320{
321 struct scsi_cmnd *sc = fsp->cmd;
322 struct fc_lport *lp = fsp->lp;
323 struct fcoe_dev_stats *stats;
324 struct fc_frame_header *fh;
325 size_t start_offset;
326 size_t offset;
327 u32 crc;
328 u32 copy_len = 0;
329 size_t len;
330 void *buf;
331 struct scatterlist *sg;
332 size_t remaining;
333
334 fh = fc_frame_header_get(fp);
335 offset = ntohl(fh->fh_parm_offset);
336 start_offset = offset;
337 len = fr_len(fp) - sizeof(*fh);
338 buf = fc_frame_payload_get(fp, 0);
339
b277d2aa
YZ		 340 /* if this I/O is ddped, update xfer len */
341 fc_fcp_ddp_done(fsp);
342
42e9a92f 343 if (offset + len > fsp->data_len) {
34f42a07 344 /* this should never happen */
42e9a92f
RL		 345 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
346 fc_frame_crc_check(fp))
347 goto crc_err;
7414705e
RL		 348 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
349 "data_len %x\n", len, offset, fsp->data_len);
42e9a92f
RL		 350 fc_fcp_retry_cmd(fsp);
351 return;
352 }
353 if (offset != fsp->xfer_len)
354 fsp->state |= FC_SRB_DISCONTIG;
355
356 crc = 0;
357 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
358 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
359
360 sg = scsi_sglist(sc);
361 remaining = len;
362
363 while (remaining > 0 && sg) {
364 size_t off;
365 void *page_addr;
366 size_t sg_bytes;
367
368 if (offset >= sg->length) {
369 offset -= sg->length;
370 sg = sg_next(sg);
371 continue;
372 }
373 sg_bytes = min(remaining, sg->length - offset);
374
375 /*
376 * The scatterlist item may be bigger than PAGE_SIZE,
377 * but we are limited to mapping PAGE_SIZE at a time.
378 */
379 off = offset + sg->offset;
380 sg_bytes = min(sg_bytes, (size_t)
381 (PAGE_SIZE - (off & ~PAGE_MASK)));
382 page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
383 KM_SOFTIRQ0);
384 if (!page_addr)
385 break; /* XXX panic? */
386
387 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
388 crc = crc32(crc, buf, sg_bytes);
389 memcpy((char *)page_addr + (off & ~PAGE_MASK), buf,
390 sg_bytes);
391
392 kunmap_atomic(page_addr, KM_SOFTIRQ0);
393 buf += sg_bytes;
394 offset += sg_bytes;
395 remaining -= sg_bytes;
396 copy_len += sg_bytes;
397 }
398
399 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
400 buf = fc_frame_payload_get(fp, 0);
401 if (len % 4) {
402 crc = crc32(crc, buf + len, 4 - (len % 4));
403 len += 4 - (len % 4);
404 }
405
406 if (~crc != le32_to_cpu(fr_crc(fp))) {
407crc_err:
582b45bc 408 stats = fc_lport_get_stats(lp);
42e9a92f 409 stats->ErrorFrames++;
582b45bc 410 /* FIXME - per cpu count, not total count! */
42e9a92f 411 if (stats->InvalidCRCCount++ < 5)
7414705e
RL		 412 printk(KERN_WARNING "libfc: CRC error on data "
413 "frame for port (%6x)\n",
582b45bc 414 fc_host_port_id(lp->host));
42e9a92f
RL		 415 /*
416 * Assume the frame is total garbage.
417 * We may have copied it over the good part
418 * of the buffer.
419 * If so, we need to retry the entire operation.
420 * Otherwise, ignore it.
421 */
422 if (fsp->state & FC_SRB_DISCONTIG)
423 fc_fcp_retry_cmd(fsp);
424 return;
425 }
426 }
427
428 if (fsp->xfer_contig_end == start_offset)
429 fsp->xfer_contig_end += copy_len;
430 fsp->xfer_len += copy_len;
431
432 /*
433 * In the very rare event that this data arrived after the response
434 * and completes the transfer, call the completion handler.
435 */
436 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
437 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
438 fc_fcp_complete_locked(fsp);
439}
440
34f42a07
RL		 441/**
442 * fc_fcp_send_data() - Send SCSI data to target.
42e9a92f
RL		 443 * @fsp: ptr to fc_fcp_pkt
444 * @sp: ptr to this sequence
445 * @offset: starting offset for this data request
446 * @seq_blen: the burst length for this data request
447 *
448 * Called after receiving a Transfer Ready data descriptor.
449 * if LLD is capable of seq offload then send down seq_blen
450 * size of data in single frame, otherwise send multiple FC
451 * frames of max FC frame payload supported by target port.
452 *
453 * Returns : 0 for success.
454 */
455static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
456 size_t offset, size_t seq_blen)
457{
458 struct fc_exch *ep;
459 struct scsi_cmnd *sc;
460 struct scatterlist *sg;
461 struct fc_frame *fp = NULL;
462 struct fc_lport *lp = fsp->lp;
463 size_t remaining;
464 size_t t_blen;
465 size_t tlen;
466 size_t sg_bytes;
467 size_t frame_offset, fh_parm_offset;
468 int error;
469 void *data = NULL;
470 void *page_addr;
471 int using_sg = lp->sg_supp;
472 u32 f_ctl;
473
474 WARN_ON(seq_blen <= 0);
475 if (unlikely(offset + seq_blen > fsp->data_len)) {
476 /* this should never happen */
7414705e
RL		 477 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
478 "offset %zx\n", seq_blen, offset);
42e9a92f
RL		 479 fc_fcp_send_abort(fsp);
480 return 0;
481 } else if (offset != fsp->xfer_len) {
482 /* Out of Order Data Request - no problem, but unexpected. */
7414705e
RL		 483 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
484 "seq_blen %zx offset %zx\n", seq_blen, offset);
42e9a92f
RL		 485 }
486
487 /*
488 * if LLD is capable of seq_offload then set transport
489 * burst length (t_blen) to seq_blen, otherwise set t_blen
490 * to max FC frame payload previously set in fsp->max_payload.
491 */
276d6814
YZ		 492 t_blen = fsp->max_payload;
493 if (lp->seq_offload) {
494 t_blen = min(seq_blen, (size_t)lp->lso_max);
7414705e 495 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
276d6814
YZ		 496 fsp, seq_blen, lp->lso_max, t_blen);
497 }
498
42e9a92f
RL		 499 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
500 if (t_blen > 512)
501 t_blen &= ~(512 - 1); /* round down to block size */
502 WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
503 sc = fsp->cmd;
504
505 remaining = seq_blen;
506 fh_parm_offset = frame_offset = offset;
507 tlen = 0;
508 seq = lp->tt.seq_start_next(seq);
509 f_ctl = FC_FC_REL_OFF;
510 WARN_ON(!seq);
511
42e9a92f
RL		 512 sg = scsi_sglist(sc);
513
514 while (remaining > 0 && sg) {
515 if (offset >= sg->length) {
516 offset -= sg->length;
517 sg = sg_next(sg);
518 continue;
519 }
520 if (!fp) {
521 tlen = min(t_blen, remaining);
522
523 /*
524 * TODO. Temporary workaround. fc_seq_send() can't
525 * handle odd lengths in non-linear skbs.
526 * This will be the final fragment only.
527 */
528 if (tlen % 4)
529 using_sg = 0;
530 if (using_sg) {
531 fp = _fc_frame_alloc(lp, 0);
532 if (!fp)
533 return -ENOMEM;
534 } else {
535 fp = fc_frame_alloc(lp, tlen);
536 if (!fp)
537 return -ENOMEM;
538
539 data = (void *)(fr_hdr(fp)) +
540 sizeof(struct fc_frame_header);
541 }
542 fh_parm_offset = frame_offset;
543 fr_max_payload(fp) = fsp->max_payload;
544 }
545 sg_bytes = min(tlen, sg->length - offset);
546 if (using_sg) {
42e9a92f
RL		 547 get_page(sg_page(sg));
548 skb_fill_page_desc(fp_skb(fp),
549 skb_shinfo(fp_skb(fp))->nr_frags,
550 sg_page(sg), sg->offset + offset,
551 sg_bytes);
552 fp_skb(fp)->data_len += sg_bytes;
553 fr_len(fp) += sg_bytes;
554 fp_skb(fp)->truesize += PAGE_SIZE;
555 } else {
556 size_t off = offset + sg->offset;
557
558 /*
559 * The scatterlist item may be bigger than PAGE_SIZE,
560 * but we must not cross pages inside the kmap.
561 */
562 sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE -
563 (off & ~PAGE_MASK)));
564 page_addr = kmap_atomic(sg_page(sg) +
565 (off >> PAGE_SHIFT),
566 KM_SOFTIRQ0);
567 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
568 sg_bytes);
569 kunmap_atomic(page_addr, KM_SOFTIRQ0);
570 data += sg_bytes;
571 }
572 offset += sg_bytes;
573 frame_offset += sg_bytes;
574 tlen -= sg_bytes;
575 remaining -= sg_bytes;
576
d37322a4
YZ		 577 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
578 (tlen))
42e9a92f
RL		 579 continue;
580
581 /*
582 * Send sequence with transfer sequence initiative in case
583 * this is last FCP frame of the sequence.
584 */
585 if (remaining == 0)
586 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
587
588 ep = fc_seq_exch(seq);
589 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
590 FC_TYPE_FCP, f_ctl, fh_parm_offset);
591
592 /*
593 * send fragment using for a sequence.
594 */
595 error = lp->tt.seq_send(lp, seq, fp);
596 if (error) {
597 WARN_ON(1); /* send error should be rare */
598 fc_fcp_retry_cmd(fsp);
599 return 0;
600 }
601 fp = NULL;
602 }
603 fsp->xfer_len += seq_blen; /* premature count? */
604 return 0;
605}
606
607static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
608{
609 int ba_done = 1;
610 struct fc_ba_rjt *brp;
611 struct fc_frame_header *fh;
612
613 fh = fc_frame_header_get(fp);
614 switch (fh->fh_r_ctl) {
615 case FC_RCTL_BA_ACC:
616 break;
617 case FC_RCTL_BA_RJT:
618 brp = fc_frame_payload_get(fp, sizeof(*brp));
619 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
620 break;
621 /* fall thru */
622 default:
623 /*
624 * we will let the command timeout
625 * and scsi-ml recover in this case,
626 * therefore cleared the ba_done flag.
627 */
628 ba_done = 0;
629 }
630
631 if (ba_done) {
632 fsp->state |= FC_SRB_ABORTED;
633 fsp->state &= ~FC_SRB_ABORT_PENDING;
634
635 if (fsp->wait_for_comp)
636 complete(&fsp->tm_done);
637 else
638 fc_fcp_complete_locked(fsp);
639 }
640}
641
34f42a07
RL		 642/**
643 * fc_fcp_reduce_can_queue() - drop can_queue
42e9a92f
RL		 644 * @lp: lport to drop queueing for
645 *
646 * If we are getting memory allocation failures, then we may
647 * be trying to execute too many commands. We let the running
648 * commands complete or timeout, then try again with a reduced
649 * can_queue. Eventually we will hit the point where we run
650 * on all reserved structs.
651 */
652static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
653{
654 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
655 unsigned long flags;
656 int can_queue;
657
658 spin_lock_irqsave(lp->host->host_lock, flags);
659 if (si->throttled)
660 goto done;
661 si->throttled = 1;
662
663 can_queue = lp->host->can_queue;
664 can_queue >>= 1;
665 if (!can_queue)
666 can_queue = 1;
667 lp->host->can_queue = can_queue;
7414705e 668 shost_printk(KERN_ERR, lp->host, "libfc: Could not allocate frame.\n"
42e9a92f
RL		 669 "Reducing can_queue to %d.\n", can_queue);
670done:
671 spin_unlock_irqrestore(lp->host->host_lock, flags);
672}
673
34f42a07
RL		 674/**
675 * fc_fcp_recv() - Reveive FCP frames
676 * @seq: The sequence the frame is on
677 * @fp: The FC frame
678 * @arg: The related FCP packet
42e9a92f
RL		 679 *
680 * Return : None
681 * Context : called from Soft IRQ context
682 * can not called holding list lock
683 */
684static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
685{
686 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
a29e7646 687 struct fc_lport *lport = fsp->lp;
42e9a92f
RL		 688 struct fc_frame_header *fh;
689 struct fcp_txrdy *dd;
690 u8 r_ctl;
691 int rc = 0;
692
693 if (IS_ERR(fp))
694 goto errout;
695
696 fh = fc_frame_header_get(fp);
697 r_ctl = fh->fh_r_ctl;
42e9a92f 698
a29e7646 699 if (!(lport->state & LPORT_ST_READY))
42e9a92f
RL		 700 goto out;
701 if (fc_fcp_lock_pkt(fsp))
702 goto out;
703 fsp->last_pkt_time = jiffies;
704
705 if (fh->fh_type == FC_TYPE_BLS) {
706 fc_fcp_abts_resp(fsp, fp);
707 goto unlock;
708 }
709
710 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
711 goto unlock;
712
713 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
714 /*
715 * received XFER RDY from the target
716 * need to send data to the target
717 */
718 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
719 dd = fc_frame_payload_get(fp, sizeof(*dd));
720 WARN_ON(!dd);
721
722 rc = fc_fcp_send_data(fsp, seq,
723 (size_t) ntohl(dd->ft_data_ro),
724 (size_t) ntohl(dd->ft_burst_len));
725 if (!rc)
726 seq->rec_data = fsp->xfer_len;
727 else if (rc == -ENOMEM)
728 fsp->state |= FC_SRB_NOMEM;
729 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
730 /*
731 * received a DATA frame
732 * next we will copy the data to the system buffer
733 */
734 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
735 fc_fcp_recv_data(fsp, fp);
736 seq->rec_data = fsp->xfer_contig_end;
737 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
738 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
739
740 fc_fcp_resp(fsp, fp);
741 } else {
7414705e 742 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
42e9a92f
RL		 743 }
744unlock:
745 fc_fcp_unlock_pkt(fsp);
746out:
747 fc_frame_free(fp);
748errout:
749 if (IS_ERR(fp))
750 fc_fcp_error(fsp, fp);
751 else if (rc == -ENOMEM)
a29e7646 752 fc_fcp_reduce_can_queue(lport);
42e9a92f
RL		 753}
754
755static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
756{
757 struct fc_frame_header *fh;
758 struct fcp_resp *fc_rp;
759 struct fcp_resp_ext *rp_ex;
760 struct fcp_resp_rsp_info *fc_rp_info;
761 u32 plen;
762 u32 expected_len;
763 u32 respl = 0;
764 u32 snsl = 0;
765 u8 flags = 0;
766
767 plen = fr_len(fp);
768 fh = (struct fc_frame_header *)fr_hdr(fp);
769 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
770 goto len_err;
771 plen -= sizeof(*fh);
772 fc_rp = (struct fcp_resp *)(fh + 1);
773 fsp->cdb_status = fc_rp->fr_status;
774 flags = fc_rp->fr_flags;
775 fsp->scsi_comp_flags = flags;
776 expected_len = fsp->data_len;
777
b277d2aa
YZ		 778 /* if ddp, update xfer len */
779 fc_fcp_ddp_done(fsp);
780
42e9a92f
RL		 781 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
782 rp_ex = (void *)(fc_rp + 1);
783 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
784 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
785 goto len_err;
786 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
787 if (flags & FCP_RSP_LEN_VAL) {
788 respl = ntohl(rp_ex->fr_rsp_len);
789 if (respl != sizeof(*fc_rp_info))
790 goto len_err;
791 if (fsp->wait_for_comp) {
792 /* Abuse cdb_status for rsp code */
793 fsp->cdb_status = fc_rp_info->rsp_code;
794 complete(&fsp->tm_done);
795 /*
796 * tmfs will not have any scsi cmd so
797 * exit here
798 */
799 return;
800 } else
801 goto err;
802 }
803 if (flags & FCP_SNS_LEN_VAL) {
804 snsl = ntohl(rp_ex->fr_sns_len);
805 if (snsl > SCSI_SENSE_BUFFERSIZE)
806 snsl = SCSI_SENSE_BUFFERSIZE;
807 memcpy(fsp->cmd->sense_buffer,
808 (char *)fc_rp_info + respl, snsl);
809 }
810 }
811 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
812 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
813 goto len_err;
814 if (flags & FCP_RESID_UNDER) {
815 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
816 /*
817 * The cmnd->underflow is the minimum number of
818 * bytes that must be transfered for this
819 * command. Provided a sense condition is not
820 * present, make sure the actual amount
821 * transferred is at least the underflow value
822 * or fail.
823 */
824 if (!(flags & FCP_SNS_LEN_VAL) &&
825 (fc_rp->fr_status == 0) &&
826 (scsi_bufflen(fsp->cmd) -
827 fsp->scsi_resid) < fsp->cmd->underflow)
828 goto err;
829 expected_len -= fsp->scsi_resid;
830 } else {
831 fsp->status_code = FC_ERROR;
832 }
833 }
834 }
835 fsp->state |= FC_SRB_RCV_STATUS;
836
837 /*
838 * Check for missing or extra data frames.
839 */
840 if (unlikely(fsp->xfer_len != expected_len)) {
841 if (fsp->xfer_len < expected_len) {
842 /*
843 * Some data may be queued locally,
844 * Wait a at least one jiffy to see if it is delivered.
845 * If this expires without data, we may do SRR.
846 */
847 fc_fcp_timer_set(fsp, 2);
848 return;
849 }
850 fsp->status_code = FC_DATA_OVRRUN;
7414705e
RL		 851 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, "
852 "len %x, data len %x\n",
853 fsp->rport->port_id,
854 fsp->xfer_len, expected_len, fsp->data_len);
42e9a92f
RL		 855 }
856 fc_fcp_complete_locked(fsp);
857 return;
858
859len_err:
7414705e
RL		 860 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
861 "snsl %u\n", flags, fr_len(fp), respl, snsl);
42e9a92f
RL		 862err:
863 fsp->status_code = FC_ERROR;
864 fc_fcp_complete_locked(fsp);
865}
866
867/**
34f42a07 868 * fc_fcp_complete_locked() - complete processing of a fcp packet
42e9a92f
RL		 869 * @fsp: fcp packet
870 *
871 * This function may sleep if a timer is pending. The packet lock must be
872 * held, and the host lock must not be held.
873 */
874static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
875{
876 struct fc_lport *lp = fsp->lp;
877 struct fc_seq *seq;
878 struct fc_exch *ep;
879 u32 f_ctl;
880
881 if (fsp->state & FC_SRB_ABORT_PENDING)
882 return;
883
884 if (fsp->state & FC_SRB_ABORTED) {
885 if (!fsp->status_code)
886 fsp->status_code = FC_CMD_ABORTED;
887 } else {
888 /*
889 * Test for transport underrun, independent of response
890 * underrun status.
891 */
892 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
893 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
894 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
895 fsp->status_code = FC_DATA_UNDRUN;
1c9fbafc 896 fsp->io_status = 0;
42e9a92f
RL		 897 }
898 }
899
900 seq = fsp->seq_ptr;
901 if (seq) {
902 fsp->seq_ptr = NULL;
903 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
904 struct fc_frame *conf_frame;
905 struct fc_seq *csp;
906
907 csp = lp->tt.seq_start_next(seq);
908 conf_frame = fc_frame_alloc(fsp->lp, 0);
909 if (conf_frame) {
910 f_ctl = FC_FC_SEQ_INIT;
911 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
912 ep = fc_seq_exch(seq);
913 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
914 ep->did, ep->sid,
915 FC_TYPE_FCP, f_ctl, 0);
916 lp->tt.seq_send(lp, csp, conf_frame);
917 }
918 }
919 lp->tt.exch_done(seq);
920 }
921 fc_io_compl(fsp);
922}
923
924static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
925{
926 struct fc_lport *lp = fsp->lp;
927
928 if (fsp->seq_ptr) {
929 lp->tt.exch_done(fsp->seq_ptr);
930 fsp->seq_ptr = NULL;
931 }
932 fsp->status_code = error;
933}
934
935/**
34f42a07 936 * fc_fcp_cleanup_each_cmd() - Cleanup active commads
42e9a92f
RL		 937 * @lp: logical port
938 * @id: target id
939 * @lun: lun
940 * @error: fsp status code
941 *
942 * If lun or id is -1, they are ignored.
943 */
944static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
945 unsigned int lun, int error)
946{
947 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
948 struct fc_fcp_pkt *fsp;
949 struct scsi_cmnd *sc_cmd;
950 unsigned long flags;
951
952 spin_lock_irqsave(lp->host->host_lock, flags);
953restart:
954 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
955 sc_cmd = fsp->cmd;
956 if (id != -1 && scmd_id(sc_cmd) != id)
957 continue;
958
959 if (lun != -1 && sc_cmd->device->lun != lun)
960 continue;
961
962 fc_fcp_pkt_hold(fsp);
963 spin_unlock_irqrestore(lp->host->host_lock, flags);
964
965 if (!fc_fcp_lock_pkt(fsp)) {
966 fc_fcp_cleanup_cmd(fsp, error);
967 fc_io_compl(fsp);
968 fc_fcp_unlock_pkt(fsp);
969 }
970
971 fc_fcp_pkt_release(fsp);
972 spin_lock_irqsave(lp->host->host_lock, flags);
973 /*
974 * while we dropped the lock multiple pkts could
975 * have been released, so we have to start over.
976 */
977 goto restart;
978 }
979 spin_unlock_irqrestore(lp->host->host_lock, flags);
980}
981
982static void fc_fcp_abort_io(struct fc_lport *lp)
983{
984 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
985}
986
987/**
34f42a07 988 * fc_fcp_pkt_send() - send a fcp packet to the lower level.
42e9a92f
RL		 989 * @lp: fc lport
990 * @fsp: fc packet.
991 *
992 * This is called by upper layer protocol.
993 * Return : zero for success and -1 for failure
994 * Context : called from queuecommand which can be called from process
995 * or scsi soft irq.
996 * Locks : called with the host lock and irqs disabled.
997 */
998static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
999{
1000 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
1001 int rc;
1002
1003 fsp->cmd->SCp.ptr = (char *)fsp;
1004 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1005 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1006
1007 int_to_scsilun(fsp->cmd->device->lun,
1008 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1009 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1010 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1011
1012 spin_unlock_irq(lp->host->host_lock);
1013 rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv);
1014 spin_lock_irq(lp->host->host_lock);
1015 if (rc)
1016 list_del(&fsp->list);
1017
1018 return rc;
1019}
1020
1021static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1022 void (*resp)(struct fc_seq *,
1023 struct fc_frame *fp,
1024 void *arg))
1025{
1026 struct fc_frame *fp;
1027 struct fc_seq *seq;
1028 struct fc_rport *rport;
1029 struct fc_rport_libfc_priv *rp;
1030 const size_t len = sizeof(fsp->cdb_cmd);
1031 int rc = 0;
1032
1033 if (fc_fcp_lock_pkt(fsp))
1034 return 0;
1035
1036 fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
1037 if (!fp) {
1038 rc = -1;
1039 goto unlock;
1040 }
1041
1042 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
b277d2aa 1043 fr_fsp(fp) = fsp;
42e9a92f
RL		 1044 rport = fsp->rport;
1045 fsp->max_payload = rport->maxframe_size;
1046 rp = rport->dd_data;
1047
1048 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1049 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1050 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1051
1052 seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1053 if (!seq) {
42e9a92f
RL		 1054 rc = -1;
1055 goto unlock;
1056 }
1057 fsp->last_pkt_time = jiffies;
1058 fsp->seq_ptr = seq;
1059 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1060
1061 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1062 fc_fcp_timer_set(fsp,
1063 (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
1064 FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
1065unlock:
1066 fc_fcp_unlock_pkt(fsp);
1067 return rc;
1068}
1069
1070/*
1071 * transport error handler
1072 */
1073static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1074{
1075 int error = PTR_ERR(fp);
1076
1077 if (fc_fcp_lock_pkt(fsp))
1078 return;
1079
7414705e 1080 if (error == -FC_EX_CLOSED) {
42e9a92f
RL		 1081 fc_fcp_retry_cmd(fsp);
1082 goto unlock;
42e9a92f 1083 }
7414705e 1084
42e9a92f
RL		 1085 /*
1086 * clear abort pending, because the lower layer
1087 * decided to force completion.
1088 */
1089 fsp->state &= ~FC_SRB_ABORT_PENDING;
1090 fsp->status_code = FC_CMD_PLOGO;
1091 fc_fcp_complete_locked(fsp);
1092unlock:
1093 fc_fcp_unlock_pkt(fsp);
1094}
1095
1096/*
1097 * Scsi abort handler- calls to send an abort
1098 * and then wait for abort completion
1099 */
c340111d 1100static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
42e9a92f
RL		 1101{
1102 int rc = FAILED;
1103
1104 if (fc_fcp_send_abort(fsp))
1105 return FAILED;
1106
1107 init_completion(&fsp->tm_done);
1108 fsp->wait_for_comp = 1;
1109
1110 spin_unlock_bh(&fsp->scsi_pkt_lock);
1111 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1112 spin_lock_bh(&fsp->scsi_pkt_lock);
1113 fsp->wait_for_comp = 0;
1114
1115 if (!rc) {
7414705e 1116 FC_FCP_DBG(fsp, "target abort cmd failed\n");
42e9a92f
RL		 1117 rc = FAILED;
1118 } else if (fsp->state & FC_SRB_ABORTED) {
7414705e 1119 FC_FCP_DBG(fsp, "target abort cmd passed\n");
42e9a92f
RL		 1120 rc = SUCCESS;
1121 fc_fcp_complete_locked(fsp);
1122 }
1123
1124 return rc;
1125}
1126
1127/*
1128 * Retry LUN reset after resource allocation failed.
1129 */
1130static void fc_lun_reset_send(unsigned long data)
1131{
1132 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1133 struct fc_lport *lp = fsp->lp;
1134 if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) {
1135 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1136 return;
1137 if (fc_fcp_lock_pkt(fsp))
1138 return;
1139 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1140 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1141 fc_fcp_unlock_pkt(fsp);
1142 }
1143}
1144
1145/*
1146 * Scsi device reset handler- send a LUN RESET to the device
1147 * and wait for reset reply
1148 */
1149static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1150 unsigned int id, unsigned int lun)
1151{
1152 int rc;
1153
1154 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1155 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1156 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1157
1158 fsp->wait_for_comp = 1;
1159 init_completion(&fsp->tm_done);
1160
1161 fc_lun_reset_send((unsigned long)fsp);
1162
1163 /*
1164 * wait for completion of reset
1165 * after that make sure all commands are terminated
1166 */
1167 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1168
1169 spin_lock_bh(&fsp->scsi_pkt_lock);
1170 fsp->state |= FC_SRB_COMPL;
1171 spin_unlock_bh(&fsp->scsi_pkt_lock);
1172
1173 del_timer_sync(&fsp->timer);
1174
1175 spin_lock_bh(&fsp->scsi_pkt_lock);
1176 if (fsp->seq_ptr) {
1177 lp->tt.exch_done(fsp->seq_ptr);
1178 fsp->seq_ptr = NULL;
1179 }
1180 fsp->wait_for_comp = 0;
1181 spin_unlock_bh(&fsp->scsi_pkt_lock);
1182
1183 if (!rc) {
7414705e 1184 FC_SCSI_DBG(lp, "lun reset failed\n");
42e9a92f
RL		 1185 return FAILED;
1186 }
1187
1188 /* cdb_status holds the tmf's rsp code */
1189 if (fsp->cdb_status != FCP_TMF_CMPL)
1190 return FAILED;
1191
7414705e 1192 FC_SCSI_DBG(lp, "lun reset to lun %u completed\n", lun);
42e9a92f
RL		 1193 fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED);
1194 return SUCCESS;
1195}
1196
1197/*
1198 * Task Managment response handler
1199 */
1200static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1201{
1202 struct fc_fcp_pkt *fsp = arg;
1203 struct fc_frame_header *fh;
1204
1205 if (IS_ERR(fp)) {
1206 /*
1207 * If there is an error just let it timeout or wait
1208 * for TMF to be aborted if it timedout.
1209 *
1210 * scsi-eh will escalate for when either happens.
1211 */
1212 return;
1213 }
1214
1215 if (fc_fcp_lock_pkt(fsp))
1216 return;
1217
1218 /*
1219 * raced with eh timeout handler.
1220 */
1221 if (!fsp->seq_ptr || !fsp->wait_for_comp) {
1222 spin_unlock_bh(&fsp->scsi_pkt_lock);
1223 return;
1224 }
1225
1226 fh = fc_frame_header_get(fp);
1227 if (fh->fh_type != FC_TYPE_BLS)
1228 fc_fcp_resp(fsp, fp);
1229 fsp->seq_ptr = NULL;
1230 fsp->lp->tt.exch_done(seq);
1231 fc_frame_free(fp);
1232 fc_fcp_unlock_pkt(fsp);
1233}
1234
1235static void fc_fcp_cleanup(struct fc_lport *lp)
1236{
1237 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
1238}
1239
1240/*
1241 * fc_fcp_timeout: called by OS timer function.
1242 *
1243 * The timer has been inactivated and must be reactivated if desired
1244 * using fc_fcp_timer_set().
1245 *
1246 * Algorithm:
1247 *
1248 * If REC is supported, just issue it, and return. The REC exchange will
1249 * complete or time out, and recovery can continue at that point.
1250 *
1251 * Otherwise, if the response has been received without all the data,
1252 * it has been ER_TIMEOUT since the response was received.
1253 *
1254 * If the response has not been received,
1255 * we see if data was received recently. If it has been, we continue waiting,
1256 * otherwise, we abort the command.
1257 */
1258static void fc_fcp_timeout(unsigned long data)
1259{
1260 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1261 struct fc_rport *rport = fsp->rport;
1262 struct fc_rport_libfc_priv *rp = rport->dd_data;
1263
1264 if (fc_fcp_lock_pkt(fsp))
1265 return;
1266
1267 if (fsp->cdb_cmd.fc_tm_flags)
1268 goto unlock;
1269
1270 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1271
1272 if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
1273 fc_fcp_rec(fsp);
1274 else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
1275 jiffies))
1276 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1277 else if (fsp->state & FC_SRB_RCV_STATUS)
1278 fc_fcp_complete_locked(fsp);
1279 else
1280 fc_timeout_error(fsp);
1281 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1282unlock:
1283 fc_fcp_unlock_pkt(fsp);
1284}
1285
1286/*
1287 * Send a REC ELS request
1288 */
1289static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1290{
1291 struct fc_lport *lp;
1292 struct fc_frame *fp;
1293 struct fc_rport *rport;
1294 struct fc_rport_libfc_priv *rp;
1295
1296 lp = fsp->lp;
1297 rport = fsp->rport;
1298 rp = rport->dd_data;
1299 if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) {
1300 fsp->status_code = FC_HRD_ERROR;
1c9fbafc 1301 fsp->io_status = 0;
42e9a92f
RL		 1302 fc_fcp_complete_locked(fsp);
1303 return;
1304 }
1305 fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec));
1306 if (!fp)
1307 goto retry;
1308
1309 fr_seq(fp) = fsp->seq_ptr;
1310 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1311 fc_host_port_id(rp->local_port->host), FC_TYPE_ELS,
1312 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
a46f327a 1313 if (lp->tt.elsct_send(lp, rport->port_id, fp, ELS_REC, fc_fcp_rec_resp,
42e9a92f
RL		 1314 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) {
1315 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1316 return;
1317 }
42e9a92f
RL		 1318retry:
1319 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1320 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1321 else
1322 fc_timeout_error(fsp);
1323}
1324
1325/*
1326 * Receive handler for REC ELS frame
1327 * if it is a reject then let the scsi layer to handle
1328 * the timeout. if it is a LS_ACC then if the io was not completed
1329 * then set the timeout and return otherwise complete the exchange
1330 * and tell the scsi layer to restart the I/O.
1331 */
1332static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1333{
1334 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1335 struct fc_els_rec_acc *recp;
1336 struct fc_els_ls_rjt *rjt;
1337 u32 e_stat;
1338 u8 opcode;
1339 u32 offset;
1340 enum dma_data_direction data_dir;
1341 enum fc_rctl r_ctl;
1342 struct fc_rport_libfc_priv *rp;
1343
1344 if (IS_ERR(fp)) {
1345 fc_fcp_rec_error(fsp, fp);
1346 return;
1347 }
1348
1349 if (fc_fcp_lock_pkt(fsp))
1350 goto out;
1351
1352 fsp->recov_retry = 0;
1353 opcode = fc_frame_payload_op(fp);
1354 if (opcode == ELS_LS_RJT) {
1355 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1356 switch (rjt->er_reason) {
1357 default:
7414705e
RL		 1358 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1359 "reason %d expl %d\n",
1360 fsp->rport->port_id, rjt->er_reason,
1361 rjt->er_explan);
42e9a92f
RL		 1362 /* fall through */
1363 case ELS_RJT_UNSUP:
7414705e 1364 FC_FCP_DBG(fsp, "device does not support REC\n");
42e9a92f
RL		 1365 rp = fsp->rport->dd_data;
1366 /*
1367 * if we do not spport RECs or got some bogus
1368 * reason then resetup timer so we check for
1369 * making progress.
1370 */
1371 rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1372 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1373 break;
1374 case ELS_RJT_LOGIC:
1375 case ELS_RJT_UNAB:
1376 /*
1377 * If no data transfer, the command frame got dropped
1378 * so we just retry. If data was transferred, we
1379 * lost the response but the target has no record,
1380 * so we abort and retry.
1381 */
1382 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1383 fsp->xfer_len == 0) {
1384 fc_fcp_retry_cmd(fsp);
1385 break;
1386 }
1387 fc_timeout_error(fsp);
1388 break;
1389 }
1390 } else if (opcode == ELS_LS_ACC) {
1391 if (fsp->state & FC_SRB_ABORTED)
1392 goto unlock_out;
1393
1394 data_dir = fsp->cmd->sc_data_direction;
1395 recp = fc_frame_payload_get(fp, sizeof(*recp));
1396 offset = ntohl(recp->reca_fc4value);
1397 e_stat = ntohl(recp->reca_e_stat);
1398
1399 if (e_stat & ESB_ST_COMPLETE) {
1400
1401 /*
1402 * The exchange is complete.
1403 *
1404 * For output, we must've lost the response.
1405 * For input, all data must've been sent.
1406 * We lost may have lost the response
1407 * (and a confirmation was requested) and maybe
1408 * some data.
1409 *
1410 * If all data received, send SRR
1411 * asking for response. If partial data received,
1412 * or gaps, SRR requests data at start of gap.
1413 * Recovery via SRR relies on in-order-delivery.
1414 */
1415 if (data_dir == DMA_TO_DEVICE) {
1416 r_ctl = FC_RCTL_DD_CMD_STATUS;
1417 } else if (fsp->xfer_contig_end == offset) {
1418 r_ctl = FC_RCTL_DD_CMD_STATUS;
1419 } else {
1420 offset = fsp->xfer_contig_end;
1421 r_ctl = FC_RCTL_DD_SOL_DATA;
1422 }
1423 fc_fcp_srr(fsp, r_ctl, offset);
1424 } else if (e_stat & ESB_ST_SEQ_INIT) {
1425
1426 /*
1427 * The remote port has the initiative, so just
1428 * keep waiting for it to complete.
1429 */
1430 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1431 } else {
1432
1433 /*
1434 * The exchange is incomplete, we have seq. initiative.
1435 * Lost response with requested confirmation,
1436 * lost confirmation, lost transfer ready or
1437 * lost write data.
1438 *
1439 * For output, if not all data was received, ask
1440 * for transfer ready to be repeated.
1441 *
1442 * If we received or sent all the data, send SRR to
1443 * request response.
1444 *
1445 * If we lost a response, we may have lost some read
1446 * data as well.
1447 */
1448 r_ctl = FC_RCTL_DD_SOL_DATA;
1449 if (data_dir == DMA_TO_DEVICE) {
1450 r_ctl = FC_RCTL_DD_CMD_STATUS;
1451 if (offset < fsp->data_len)
1452 r_ctl = FC_RCTL_DD_DATA_DESC;
1453 } else if (offset == fsp->xfer_contig_end) {
1454 r_ctl = FC_RCTL_DD_CMD_STATUS;
1455 } else if (fsp->xfer_contig_end < offset) {
1456 offset = fsp->xfer_contig_end;
1457 }
1458 fc_fcp_srr(fsp, r_ctl, offset);
1459 }
1460 }
1461unlock_out:
1462 fc_fcp_unlock_pkt(fsp);
1463out:
1464 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1465 fc_frame_free(fp);
1466}
1467
1468/*
1469 * Handle error response or timeout for REC exchange.
1470 */
1471static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1472{
1473 int error = PTR_ERR(fp);
1474
1475 if (fc_fcp_lock_pkt(fsp))
1476 goto out;
1477
1478 switch (error) {
1479 case -FC_EX_CLOSED:
1480 fc_fcp_retry_cmd(fsp);
1481 break;
1482
1483 default:
7414705e
RL		 1484 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
1485 fsp, fsp->rport->port_id, error);
42e9a92f
RL		 1486 fsp->status_code = FC_CMD_PLOGO;
1487 /* fall through */
1488
1489 case -FC_EX_TIMEOUT:
1490 /*
1491 * Assume REC or LS_ACC was lost.
1492 * The exchange manager will have aborted REC, so retry.
1493 */
7414705e
RL		 1494 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n",
1495 fsp->rport->port_id, error, fsp->recov_retry,
1496 FC_MAX_RECOV_RETRY);
42e9a92f
RL		 1497 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1498 fc_fcp_rec(fsp);
1499 else
1500 fc_timeout_error(fsp);
1501 break;
1502 }
1503 fc_fcp_unlock_pkt(fsp);
1504out:
1505 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1506}
1507
1508/*
1509 * Time out error routine:
1510 * abort's the I/O close the exchange and
1511 * send completion notification to scsi layer
1512 */
1513static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1514{
1515 fsp->status_code = FC_CMD_TIME_OUT;
1516 fsp->cdb_status = 0;
1517 fsp->io_status = 0;
1518 /*
1519 * if this fails then we let the scsi command timer fire and
1520 * scsi-ml escalate.
1521 */
1522 fc_fcp_send_abort(fsp);
1523}
1524
1525/*
1526 * Sequence retransmission request.
1527 * This is called after receiving status but insufficient data, or
1528 * when expecting status but the request has timed out.
1529 */
1530static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1531{
1532 struct fc_lport *lp = fsp->lp;
1533 struct fc_rport *rport;
1534 struct fc_rport_libfc_priv *rp;
1535 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1536 struct fc_seq *seq;
1537 struct fcp_srr *srr;
1538 struct fc_frame *fp;
1539 u8 cdb_op;
1540
1541 rport = fsp->rport;
1542 rp = rport->dd_data;
1543 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1544
1545 if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
1546 goto retry; /* shouldn't happen */
1547 fp = fc_frame_alloc(lp, sizeof(*srr));
1548 if (!fp)
1549 goto retry;
1550
1551 srr = fc_frame_payload_get(fp, sizeof(*srr));
1552 memset(srr, 0, sizeof(*srr));
1553 srr->srr_op = ELS_SRR;
1554 srr->srr_ox_id = htons(ep->oxid);
1555 srr->srr_rx_id = htons(ep->rxid);
1556 srr->srr_r_ctl = r_ctl;
1557 srr->srr_rel_off = htonl(offset);
1558
1559 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1560 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1561 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1562
1563 seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL,
1564 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
8f550f93 1565 if (!seq)
42e9a92f 1566 goto retry;
8f550f93 1567
42e9a92f
RL		 1568 fsp->recov_seq = seq;
1569 fsp->xfer_len = offset;
1570 fsp->xfer_contig_end = offset;
1571 fsp->state &= ~FC_SRB_RCV_STATUS;
1572 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1573 return;
1574retry:
1575 fc_fcp_retry_cmd(fsp);
1576}
1577
1578/*
1579 * Handle response from SRR.
1580 */
1581static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1582{
1583 struct fc_fcp_pkt *fsp = arg;
1584 struct fc_frame_header *fh;
1585
1586 if (IS_ERR(fp)) {
1587 fc_fcp_srr_error(fsp, fp);
1588 return;
1589 }
1590
1591 if (fc_fcp_lock_pkt(fsp))
1592 goto out;
1593
1594 fh = fc_frame_header_get(fp);
1595 /*
1596 * BUG? fc_fcp_srr_error calls exch_done which would release
1597 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1598 * then fc_exch_timeout would be sending an abort. The exch_done
1599 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1600 * an abort response though.
1601 */
1602 if (fh->fh_type == FC_TYPE_BLS) {
1603 fc_fcp_unlock_pkt(fsp);
1604 return;
1605 }
1606
1607 fsp->recov_seq = NULL;
1608 switch (fc_frame_payload_op(fp)) {
1609 case ELS_LS_ACC:
1610 fsp->recov_retry = 0;
1611 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1612 break;
1613 case ELS_LS_RJT:
1614 default:
1615 fc_timeout_error(fsp);
1616 break;
1617 }
1618 fc_fcp_unlock_pkt(fsp);
1619 fsp->lp->tt.exch_done(seq);
1620out:
1621 fc_frame_free(fp);
1622 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1623}
1624
1625static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1626{
1627 if (fc_fcp_lock_pkt(fsp))
1628 goto out;
1629 fsp->lp->tt.exch_done(fsp->recov_seq);
1630 fsp->recov_seq = NULL;
1631 switch (PTR_ERR(fp)) {
1632 case -FC_EX_TIMEOUT:
1633 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1634 fc_fcp_rec(fsp);
1635 else
1636 fc_timeout_error(fsp);
1637 break;
1638 case -FC_EX_CLOSED: /* e.g., link failure */
1639 /* fall through */
1640 default:
1641 fc_fcp_retry_cmd(fsp);
1642 break;
1643 }
1644 fc_fcp_unlock_pkt(fsp);
1645out:
1646 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1647}
1648
1649static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
1650{
1651 /* lock ? */
bc0e17f6 1652 return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull;
42e9a92f
RL		 1653}
1654
1655/**
1656 * fc_queuecommand - The queuecommand function of the scsi template
1657 * @cmd: struct scsi_cmnd to be executed
1658 * @done: Callback function to be called when cmd is completed
1659 *
1660 * this is the i/o strategy routine, called by the scsi layer
1661 * this routine is called with holding the host_lock.
1662 */
1663int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1664{
1665 struct fc_lport *lp;
1666 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1667 struct fc_fcp_pkt *fsp;
1668 struct fc_rport_libfc_priv *rp;
1669 int rval;
1670 int rc = 0;
1671 struct fcoe_dev_stats *stats;
1672
1673 lp = shost_priv(sc_cmd->device->host);
1674
1675 rval = fc_remote_port_chkready(rport);
1676 if (rval) {
1677 sc_cmd->result = rval;
1678 done(sc_cmd);
1679 goto out;
1680 }
1681
1682 if (!*(struct fc_remote_port **)rport->dd_data) {
1683 /*
1684 * rport is transitioning from blocked/deleted to
1685 * online
1686 */
1687 sc_cmd->result = DID_IMM_RETRY << 16;
1688 done(sc_cmd);
1689 goto out;
1690 }
1691
1692 rp = rport->dd_data;
1693
1694 if (!fc_fcp_lport_queue_ready(lp)) {
1695 rc = SCSI_MLQUEUE_HOST_BUSY;
1696 goto out;
1697 }
1698
1699 fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
1700 if (fsp == NULL) {
1701 rc = SCSI_MLQUEUE_HOST_BUSY;
1702 goto out;
1703 }
1704
1705 /*
1706 * build the libfc request pkt
1707 */
1708 fsp->cmd = sc_cmd; /* save the cmd */
1709 fsp->lp = lp; /* save the softc ptr */
1710 fsp->rport = rport; /* set the remote port ptr */
5e472d07 1711 fsp->xfer_ddp = FC_XID_UNKNOWN;
42e9a92f
RL		 1712 sc_cmd->scsi_done = done;
1713
1714 /*
1715 * set up the transfer length
1716 */
1717 fsp->data_len = scsi_bufflen(sc_cmd);
1718 fsp->xfer_len = 0;
1719
1720 /*
1721 * setup the data direction
1722 */
582b45bc 1723 stats = fc_lport_get_stats(lp);
42e9a92f
RL		 1724 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1725 fsp->req_flags = FC_SRB_READ;
1726 stats->InputRequests++;
1727 stats->InputMegabytes = fsp->data_len;
1728 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1729 fsp->req_flags = FC_SRB_WRITE;
1730 stats->OutputRequests++;
1731 stats->OutputMegabytes = fsp->data_len;
1732 } else {
1733 fsp->req_flags = 0;
1734 stats->ControlRequests++;
1735 }
1736
1737 fsp->tgt_flags = rp->flags;
1738
1739 init_timer(&fsp->timer);
1740 fsp->timer.data = (unsigned long)fsp;
1741
1742 /*
1743 * send it to the lower layer
1744 * if we get -1 return then put the request in the pending
1745 * queue.
1746 */
1747 rval = fc_fcp_pkt_send(lp, fsp);
1748 if (rval != 0) {
1749 fsp->state = FC_SRB_FREE;
1750 fc_fcp_pkt_release(fsp);
1751 rc = SCSI_MLQUEUE_HOST_BUSY;
1752 }
1753out:
1754 return rc;
1755}
1756EXPORT_SYMBOL(fc_queuecommand);
1757
1758/**
34f42a07 1759 * fc_io_compl() - Handle responses for completed commands
42e9a92f
RL		 1760 * @fsp: scsi packet
1761 *
1762 * Translates a error to a Linux SCSI error.
1763 *
1764 * The fcp packet lock must be held when calling.
1765 */
1766static void fc_io_compl(struct fc_fcp_pkt *fsp)
1767{
1768 struct fc_fcp_internal *si;
1769 struct scsi_cmnd *sc_cmd;
1770 struct fc_lport *lp;
1771 unsigned long flags;
1772
b277d2aa
YZ		 1773 /* release outstanding ddp context */
1774 fc_fcp_ddp_done(fsp);
1775
42e9a92f
RL		 1776 fsp->state |= FC_SRB_COMPL;
1777 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1778 spin_unlock_bh(&fsp->scsi_pkt_lock);
1779 del_timer_sync(&fsp->timer);
1780 spin_lock_bh(&fsp->scsi_pkt_lock);
1781 }
1782
1783 lp = fsp->lp;
1784 si = fc_get_scsi_internal(lp);
1785 spin_lock_irqsave(lp->host->host_lock, flags);
1786 if (!fsp->cmd) {
1787 spin_unlock_irqrestore(lp->host->host_lock, flags);
1788 return;
1789 }
1790
1791 /*
1792 * if a command timed out while we had to try and throttle IO
1793 * and it is now getting cleaned up, then we are about to
1794 * try again so clear the throttled flag incase we get more
1795 * time outs.
1796 */
1797 if (si->throttled && fsp->state & FC_SRB_NOMEM)
1798 si->throttled = 0;
1799
1800 sc_cmd = fsp->cmd;
1801 fsp->cmd = NULL;
1802
1803 if (!sc_cmd->SCp.ptr) {
1804 spin_unlock_irqrestore(lp->host->host_lock, flags);
1805 return;
1806 }
1807
1808 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1809 switch (fsp->status_code) {
1810 case FC_COMPLETE:
1811 if (fsp->cdb_status == 0) {
1812 /*
1813 * good I/O status
1814 */
1815 sc_cmd->result = DID_OK << 16;
1816 if (fsp->scsi_resid)
1817 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
42e9a92f
RL		 1818 } else {
1819 /*
1820 * transport level I/O was ok but scsi
1821 * has non zero status
1822 */
1823 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1824 }
1825 break;
1826 case FC_ERROR:
1827 sc_cmd->result = DID_ERROR << 16;
1828 break;
1829 case FC_DATA_UNDRUN:
26d9cab5 1830 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
42e9a92f
RL		 1831 /*
1832 * scsi status is good but transport level
26d9cab5 1833 * underrun.
42e9a92f 1834 */
4347fa66
YZ		 1835 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ?
1836 DID_OK : DID_ERROR) << 16;
42e9a92f
RL		 1837 } else {
1838 /*
1839 * scsi got underrun, this is an error
1840 */
1841 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1842 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1843 }
1844 break;
1845 case FC_DATA_OVRRUN:
1846 /*
1847 * overrun is an error
1848 */
1849 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1850 break;
1851 case FC_CMD_ABORTED:
d5e6054a 1852 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
42e9a92f
RL		 1853 break;
1854 case FC_CMD_TIME_OUT:
1855 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1856 break;
1857 case FC_CMD_RESET:
1858 sc_cmd->result = (DID_RESET << 16);
1859 break;
1860 case FC_HRD_ERROR:
1861 sc_cmd->result = (DID_NO_CONNECT << 16);
1862 break;
1863 default:
1864 sc_cmd->result = (DID_ERROR << 16);
1865 break;
1866 }
1867
1868 list_del(&fsp->list);
1869 sc_cmd->SCp.ptr = NULL;
1870 sc_cmd->scsi_done(sc_cmd);
1871 spin_unlock_irqrestore(lp->host->host_lock, flags);
1872
1873 /* release ref from initial allocation in queue command */
1874 fc_fcp_pkt_release(fsp);
1875}
1876
1877/**
34f42a07 1878 * fc_fcp_complete() - complete processing of a fcp packet
42e9a92f
RL		 1879 * @fsp: fcp packet
1880 *
1881 * This function may sleep if a fsp timer is pending.
1882 * The host lock must not be held by caller.
1883 */
1884void fc_fcp_complete(struct fc_fcp_pkt *fsp)
1885{
1886 if (fc_fcp_lock_pkt(fsp))
1887 return;
1888
1889 fc_fcp_complete_locked(fsp);
1890 fc_fcp_unlock_pkt(fsp);
1891}
1892EXPORT_SYMBOL(fc_fcp_complete);
1893
1894/**
34f42a07 1895 * fc_eh_abort() - Abort a command
42e9a92f
RL		 1896 * @sc_cmd: scsi command to abort
1897 *
34f42a07 1898 * From scsi host template.
42e9a92f
RL		 1899 * send ABTS to the target device and wait for the response
1900 * sc_cmd is the pointer to the command to be aborted.
1901 */
1902int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1903{
1904 struct fc_fcp_pkt *fsp;
1905 struct fc_lport *lp;
1906 int rc = FAILED;
1907 unsigned long flags;
1908
1909 lp = shost_priv(sc_cmd->device->host);
1910 if (lp->state != LPORT_ST_READY)
1911 return rc;
bc0e17f6 1912 else if (!lp->link_up)
42e9a92f
RL		 1913 return rc;
1914
1915 spin_lock_irqsave(lp->host->host_lock, flags);
1916 fsp = CMD_SP(sc_cmd);
1917 if (!fsp) {
1918 /* command completed while scsi eh was setting up */
1919 spin_unlock_irqrestore(lp->host->host_lock, flags);
1920 return SUCCESS;
1921 }
1922 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1923 fc_fcp_pkt_hold(fsp);
1924 spin_unlock_irqrestore(lp->host->host_lock, flags);
1925
1926 if (fc_fcp_lock_pkt(fsp)) {
1927 /* completed while we were waiting for timer to be deleted */
1928 rc = SUCCESS;
1929 goto release_pkt;
1930 }
1931
c340111d 1932 rc = fc_fcp_pkt_abort(fsp);
42e9a92f
RL		 1933 fc_fcp_unlock_pkt(fsp);
1934
1935release_pkt:
1936 fc_fcp_pkt_release(fsp);
1937 return rc;
1938}
1939EXPORT_SYMBOL(fc_eh_abort);
1940
1941/**
34f42a07 1942 * fc_eh_device_reset() Reset a single LUN
42e9a92f
RL		 1943 * @sc_cmd: scsi command
1944 *
1945 * Set from scsi host template to send tm cmd to the target and wait for the
1946 * response.
1947 */
1948int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1949{
1950 struct fc_lport *lp;
1951 struct fc_fcp_pkt *fsp;
1952 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1953 int rc = FAILED;
1954 struct fc_rport_libfc_priv *rp;
1955 int rval;
1956
1957 rval = fc_remote_port_chkready(rport);
1958 if (rval)
1959 goto out;
1960
1961 rp = rport->dd_data;
1962 lp = shost_priv(sc_cmd->device->host);
1963
1964 if (lp->state != LPORT_ST_READY)
1965 return rc;
1966
7414705e
RL		 1967 FC_SCSI_DBG(lp, "Resetting rport (%6x)\n", rport->port_id);
1968
42e9a92f
RL		 1969 fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
1970 if (fsp == NULL) {
7414705e 1971 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
42e9a92f
RL		 1972 sc_cmd->result = DID_NO_CONNECT << 16;
1973 goto out;
1974 }
1975
1976 /*
1977 * Build the libfc request pkt. Do not set the scsi cmnd, because
1978 * the sc passed in is not setup for execution like when sent
1979 * through the queuecommand callout.
1980 */
1981 fsp->lp = lp; /* save the softc ptr */
1982 fsp->rport = rport; /* set the remote port ptr */
1983
1984 /*
1985 * flush outstanding commands
1986 */
1987 rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
1988 fsp->state = FC_SRB_FREE;
1989 fc_fcp_pkt_release(fsp);
1990
1991out:
1992 return rc;
1993}
1994EXPORT_SYMBOL(fc_eh_device_reset);
1995
1996/**
34f42a07 1997 * fc_eh_host_reset() - The reset function will reset the ports on the host.
42e9a92f
RL		 1998 * @sc_cmd: scsi command
1999 */
2000int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2001{
2002 struct Scsi_Host *shost = sc_cmd->device->host;
2003 struct fc_lport *lp = shost_priv(shost);
2004 unsigned long wait_tmo;
2005
7414705e
RL		 2006 FC_SCSI_DBG(lp, "Resetting host\n");
2007
42e9a92f
RL		 2008 lp->tt.lport_reset(lp);
2009 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2010 while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
2011 msleep(1000);
2012
2013 if (fc_fcp_lport_queue_ready(lp)) {
7414705e
RL		 2014 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2015 "on port (%6x)\n", fc_host_port_id(lp->host));
42e9a92f
RL		 2016 return SUCCESS;
2017 } else {
7414705e
RL		 2018 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2019 "port (%6x) is not ready.\n",
2020 fc_host_port_id(lp->host));
42e9a92f
RL		 2021 return FAILED;
2022 }
2023}
2024EXPORT_SYMBOL(fc_eh_host_reset);
2025
2026/**
34f42a07 2027 * fc_slave_alloc() - configure queue depth
42e9a92f
RL		 2028 * @sdev: scsi device
2029 *
2030 * Configures queue depth based on host's cmd_per_len. If not set
2031 * then we use the libfc default.
2032 */
2033int fc_slave_alloc(struct scsi_device *sdev)
2034{
2035 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2036 int queue_depth;
2037
2038 if (!rport || fc_remote_port_chkready(rport))
2039 return -ENXIO;
2040
2041 if (sdev->tagged_supported) {
2042 if (sdev->host->hostt->cmd_per_lun)
2043 queue_depth = sdev->host->hostt->cmd_per_lun;
2044 else
2045 queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
2046 scsi_activate_tcq(sdev, queue_depth);
2047 }
2048 return 0;
2049}
2050EXPORT_SYMBOL(fc_slave_alloc);
2051
e881a172 2052int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
42e9a92f 2053{
5c20848a
MC		 2054 switch (reason) {
2055 case SCSI_QDEPTH_DEFAULT:
2056 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2057 break;
2058 case SCSI_QDEPTH_QFULL:
2059 scsi_track_queue_full(sdev, qdepth);
2060 break;
2061 default:
e881a172 2062 return -EOPNOTSUPP;
5c20848a 2063 }
42e9a92f
RL		 2064 return sdev->queue_depth;
2065}
2066EXPORT_SYMBOL(fc_change_queue_depth);
2067
2068int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2069{
2070 if (sdev->tagged_supported) {
2071 scsi_set_tag_type(sdev, tag_type);
2072 if (tag_type)
2073 scsi_activate_tcq(sdev, sdev->queue_depth);
2074 else
2075 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2076 } else
2077 tag_type = 0;
2078
2079 return tag_type;
2080}
2081EXPORT_SYMBOL(fc_change_queue_type);
2082
2083void fc_fcp_destroy(struct fc_lport *lp)
2084{
2085 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
2086
2087 if (!list_empty(&si->scsi_pkt_queue))
7414705e
RL		 2088 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2089 "port (%6x)\n", fc_host_port_id(lp->host));
42e9a92f
RL		 2090
2091 mempool_destroy(si->scsi_pkt_pool);
2092 kfree(si);
2093 lp->scsi_priv = NULL;
2094}
2095EXPORT_SYMBOL(fc_fcp_destroy);
2096
2097int fc_fcp_init(struct fc_lport *lp)
2098{
2099 int rc;
2100 struct fc_fcp_internal *si;
2101
2102 if (!lp->tt.fcp_cmd_send)
2103 lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
2104
2105 if (!lp->tt.fcp_cleanup)
2106 lp->tt.fcp_cleanup = fc_fcp_cleanup;
2107
2108 if (!lp->tt.fcp_abort_io)
2109 lp->tt.fcp_abort_io = fc_fcp_abort_io;
2110
2111 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2112 if (!si)
2113 return -ENOMEM;
2114 lp->scsi_priv = si;
2115 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2116
2117 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2118 if (!si->scsi_pkt_pool) {
2119 rc = -ENOMEM;
2120 goto free_internal;
2121 }
2122 return 0;
2123
2124free_internal:
2125 kfree(si);
2126 return rc;
2127}
2128EXPORT_SYMBOL(fc_fcp_init);
2129
2130static int __init libfc_init(void)
2131{
2132 int rc;
2133
2134 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2135 sizeof(struct fc_fcp_pkt),
2136 0, SLAB_HWCACHE_ALIGN, NULL);
2137 if (scsi_pkt_cachep == NULL) {
7414705e
RL		 2138 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2139 "module load failed!");
42e9a92f
RL		 2140 return -ENOMEM;
2141 }
2142
2143 rc = fc_setup_exch_mgr();
2144 if (rc)
2145 goto destroy_pkt_cache;
2146
2147 rc = fc_setup_rport();
2148 if (rc)
2149 goto destroy_em;
2150
2151 return rc;
2152destroy_em:
2153 fc_destroy_exch_mgr();
2154destroy_pkt_cache:
2155 kmem_cache_destroy(scsi_pkt_cachep);
2156 return rc;
2157}
2158
2159static void __exit libfc_exit(void)
2160{
2161 kmem_cache_destroy(scsi_pkt_cachep);
2162 fc_destroy_exch_mgr();
2163 fc_destroy_rport();
2164}
2165
2166module_init(libfc_init);
2167module_exit(libfc_exit);
kernel source for telekom puls (alcatel/mediatek)