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[SCSI] fcoe: Use NETIF_F_FCOE_MTU flag to set up max frame size (lport->mfs)
[deliverable/linux.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
577 if (tlen)
578 continue;
579
580 /*
581 * Send sequence with transfer sequence initiative in case
582 * this is last FCP frame of the sequence.
583 */
584 if (remaining == 0)
585 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
586
587 ep = fc_seq_exch(seq);
588 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
589 FC_TYPE_FCP, f_ctl, fh_parm_offset);
590
591 /*
592 * send fragment using for a sequence.
593 */
594 error = lp->tt.seq_send(lp, seq, fp);
595 if (error) {
596 WARN_ON(1); /* send error should be rare */
597 fc_fcp_retry_cmd(fsp);
598 return 0;
599 }
600 fp = NULL;
601 }
602 fsp->xfer_len += seq_blen; /* premature count? */
603 return 0;
604}
605
606static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
607{
608 int ba_done = 1;
609 struct fc_ba_rjt *brp;
610 struct fc_frame_header *fh;
611
612 fh = fc_frame_header_get(fp);
613 switch (fh->fh_r_ctl) {
614 case FC_RCTL_BA_ACC:
615 break;
616 case FC_RCTL_BA_RJT:
617 brp = fc_frame_payload_get(fp, sizeof(*brp));
618 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
619 break;
620 /* fall thru */
621 default:
622 /*
623 * we will let the command timeout
624 * and scsi-ml recover in this case,
625 * therefore cleared the ba_done flag.
626 */
627 ba_done = 0;
628 }
629
630 if (ba_done) {
631 fsp->state |= FC_SRB_ABORTED;
632 fsp->state &= ~FC_SRB_ABORT_PENDING;
633
634 if (fsp->wait_for_comp)
635 complete(&fsp->tm_done);
636 else
637 fc_fcp_complete_locked(fsp);
638 }
639}
640
34f42a07
RL		 641/**
642 * fc_fcp_reduce_can_queue() - drop can_queue
42e9a92f
RL		 643 * @lp: lport to drop queueing for
644 *
645 * If we are getting memory allocation failures, then we may
646 * be trying to execute too many commands. We let the running
647 * commands complete or timeout, then try again with a reduced
648 * can_queue. Eventually we will hit the point where we run
649 * on all reserved structs.
650 */
651static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
652{
653 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
654 unsigned long flags;
655 int can_queue;
656
657 spin_lock_irqsave(lp->host->host_lock, flags);
658 if (si->throttled)
659 goto done;
660 si->throttled = 1;
661
662 can_queue = lp->host->can_queue;
663 can_queue >>= 1;
664 if (!can_queue)
665 can_queue = 1;
666 lp->host->can_queue = can_queue;
7414705e 667 shost_printk(KERN_ERR, lp->host, "libfc: Could not allocate frame.\n"
42e9a92f
RL		 668 "Reducing can_queue to %d.\n", can_queue);
669done:
670 spin_unlock_irqrestore(lp->host->host_lock, flags);
671}
672
34f42a07
RL		 673/**
674 * fc_fcp_recv() - Reveive FCP frames
675 * @seq: The sequence the frame is on
676 * @fp: The FC frame
677 * @arg: The related FCP packet
42e9a92f
RL		 678 *
679 * Return : None
680 * Context : called from Soft IRQ context
681 * can not called holding list lock
682 */
683static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
684{
685 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
a29e7646 686 struct fc_lport *lport = fsp->lp;
42e9a92f
RL		 687 struct fc_frame_header *fh;
688 struct fcp_txrdy *dd;
689 u8 r_ctl;
690 int rc = 0;
691
692 if (IS_ERR(fp))
693 goto errout;
694
695 fh = fc_frame_header_get(fp);
696 r_ctl = fh->fh_r_ctl;
42e9a92f 697
a29e7646 698 if (!(lport->state & LPORT_ST_READY))
42e9a92f
RL		 699 goto out;
700 if (fc_fcp_lock_pkt(fsp))
701 goto out;
702 fsp->last_pkt_time = jiffies;
703
704 if (fh->fh_type == FC_TYPE_BLS) {
705 fc_fcp_abts_resp(fsp, fp);
706 goto unlock;
707 }
708
709 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
710 goto unlock;
711
712 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
713 /*
714 * received XFER RDY from the target
715 * need to send data to the target
716 */
717 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
718 dd = fc_frame_payload_get(fp, sizeof(*dd));
719 WARN_ON(!dd);
720
721 rc = fc_fcp_send_data(fsp, seq,
722 (size_t) ntohl(dd->ft_data_ro),
723 (size_t) ntohl(dd->ft_burst_len));
724 if (!rc)
725 seq->rec_data = fsp->xfer_len;
726 else if (rc == -ENOMEM)
727 fsp->state |= FC_SRB_NOMEM;
728 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
729 /*
730 * received a DATA frame
731 * next we will copy the data to the system buffer
732 */
733 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
734 fc_fcp_recv_data(fsp, fp);
735 seq->rec_data = fsp->xfer_contig_end;
736 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
737 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
738
739 fc_fcp_resp(fsp, fp);
740 } else {
7414705e 741 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
42e9a92f
RL		 742 }
743unlock:
744 fc_fcp_unlock_pkt(fsp);
745out:
746 fc_frame_free(fp);
747errout:
748 if (IS_ERR(fp))
749 fc_fcp_error(fsp, fp);
750 else if (rc == -ENOMEM)
a29e7646 751 fc_fcp_reduce_can_queue(lport);
42e9a92f
RL		 752}
753
754static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
755{
756 struct fc_frame_header *fh;
757 struct fcp_resp *fc_rp;
758 struct fcp_resp_ext *rp_ex;
759 struct fcp_resp_rsp_info *fc_rp_info;
760 u32 plen;
761 u32 expected_len;
762 u32 respl = 0;
763 u32 snsl = 0;
764 u8 flags = 0;
765
766 plen = fr_len(fp);
767 fh = (struct fc_frame_header *)fr_hdr(fp);
768 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
769 goto len_err;
770 plen -= sizeof(*fh);
771 fc_rp = (struct fcp_resp *)(fh + 1);
772 fsp->cdb_status = fc_rp->fr_status;
773 flags = fc_rp->fr_flags;
774 fsp->scsi_comp_flags = flags;
775 expected_len = fsp->data_len;
776
b277d2aa
YZ		 777 /* if ddp, update xfer len */
778 fc_fcp_ddp_done(fsp);
779
42e9a92f
RL		 780 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
781 rp_ex = (void *)(fc_rp + 1);
782 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
783 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
784 goto len_err;
785 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
786 if (flags & FCP_RSP_LEN_VAL) {
787 respl = ntohl(rp_ex->fr_rsp_len);
788 if (respl != sizeof(*fc_rp_info))
789 goto len_err;
790 if (fsp->wait_for_comp) {
791 /* Abuse cdb_status for rsp code */
792 fsp->cdb_status = fc_rp_info->rsp_code;
793 complete(&fsp->tm_done);
794 /*
795 * tmfs will not have any scsi cmd so
796 * exit here
797 */
798 return;
799 } else
800 goto err;
801 }
802 if (flags & FCP_SNS_LEN_VAL) {
803 snsl = ntohl(rp_ex->fr_sns_len);
804 if (snsl > SCSI_SENSE_BUFFERSIZE)
805 snsl = SCSI_SENSE_BUFFERSIZE;
806 memcpy(fsp->cmd->sense_buffer,
807 (char *)fc_rp_info + respl, snsl);
808 }
809 }
810 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
811 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
812 goto len_err;
813 if (flags & FCP_RESID_UNDER) {
814 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
815 /*
816 * The cmnd->underflow is the minimum number of
817 * bytes that must be transfered for this
818 * command. Provided a sense condition is not
819 * present, make sure the actual amount
820 * transferred is at least the underflow value
821 * or fail.
822 */
823 if (!(flags & FCP_SNS_LEN_VAL) &&
824 (fc_rp->fr_status == 0) &&
825 (scsi_bufflen(fsp->cmd) -
826 fsp->scsi_resid) < fsp->cmd->underflow)
827 goto err;
828 expected_len -= fsp->scsi_resid;
829 } else {
830 fsp->status_code = FC_ERROR;
831 }
832 }
833 }
834 fsp->state |= FC_SRB_RCV_STATUS;
835
836 /*
837 * Check for missing or extra data frames.
838 */
839 if (unlikely(fsp->xfer_len != expected_len)) {
840 if (fsp->xfer_len < expected_len) {
841 /*
842 * Some data may be queued locally,
843 * Wait a at least one jiffy to see if it is delivered.
844 * If this expires without data, we may do SRR.
845 */
846 fc_fcp_timer_set(fsp, 2);
847 return;
848 }
849 fsp->status_code = FC_DATA_OVRRUN;
7414705e
RL		 850 FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, "
851 "len %x, data len %x\n",
852 fsp->rport->port_id,
853 fsp->xfer_len, expected_len, fsp->data_len);
42e9a92f
RL		 854 }
855 fc_fcp_complete_locked(fsp);
856 return;
857
858len_err:
7414705e
RL		 859 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
860 "snsl %u\n", flags, fr_len(fp), respl, snsl);
42e9a92f
RL		 861err:
862 fsp->status_code = FC_ERROR;
863 fc_fcp_complete_locked(fsp);
864}
865
866/**
34f42a07 867 * fc_fcp_complete_locked() - complete processing of a fcp packet
42e9a92f
RL		 868 * @fsp: fcp packet
869 *
870 * This function may sleep if a timer is pending. The packet lock must be
871 * held, and the host lock must not be held.
872 */
873static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
874{
875 struct fc_lport *lp = fsp->lp;
876 struct fc_seq *seq;
877 struct fc_exch *ep;
878 u32 f_ctl;
879
880 if (fsp->state & FC_SRB_ABORT_PENDING)
881 return;
882
883 if (fsp->state & FC_SRB_ABORTED) {
884 if (!fsp->status_code)
885 fsp->status_code = FC_CMD_ABORTED;
886 } else {
887 /*
888 * Test for transport underrun, independent of response
889 * underrun status.
890 */
891 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
892 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
893 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
894 fsp->status_code = FC_DATA_UNDRUN;
1c9fbafc 895 fsp->io_status = 0;
42e9a92f
RL		 896 }
897 }
898
899 seq = fsp->seq_ptr;
900 if (seq) {
901 fsp->seq_ptr = NULL;
902 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
903 struct fc_frame *conf_frame;
904 struct fc_seq *csp;
905
906 csp = lp->tt.seq_start_next(seq);
907 conf_frame = fc_frame_alloc(fsp->lp, 0);
908 if (conf_frame) {
909 f_ctl = FC_FC_SEQ_INIT;
910 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
911 ep = fc_seq_exch(seq);
912 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
913 ep->did, ep->sid,
914 FC_TYPE_FCP, f_ctl, 0);
915 lp->tt.seq_send(lp, csp, conf_frame);
916 }
917 }
918 lp->tt.exch_done(seq);
919 }
920 fc_io_compl(fsp);
921}
922
923static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
924{
925 struct fc_lport *lp = fsp->lp;
926
927 if (fsp->seq_ptr) {
928 lp->tt.exch_done(fsp->seq_ptr);
929 fsp->seq_ptr = NULL;
930 }
931 fsp->status_code = error;
932}
933
934/**
34f42a07 935 * fc_fcp_cleanup_each_cmd() - Cleanup active commads
42e9a92f
RL		 936 * @lp: logical port
937 * @id: target id
938 * @lun: lun
939 * @error: fsp status code
940 *
941 * If lun or id is -1, they are ignored.
942 */
943static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
944 unsigned int lun, int error)
945{
946 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
947 struct fc_fcp_pkt *fsp;
948 struct scsi_cmnd *sc_cmd;
949 unsigned long flags;
950
951 spin_lock_irqsave(lp->host->host_lock, flags);
952restart:
953 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
954 sc_cmd = fsp->cmd;
955 if (id != -1 && scmd_id(sc_cmd) != id)
956 continue;
957
958 if (lun != -1 && sc_cmd->device->lun != lun)
959 continue;
960
961 fc_fcp_pkt_hold(fsp);
962 spin_unlock_irqrestore(lp->host->host_lock, flags);
963
964 if (!fc_fcp_lock_pkt(fsp)) {
965 fc_fcp_cleanup_cmd(fsp, error);
966 fc_io_compl(fsp);
967 fc_fcp_unlock_pkt(fsp);
968 }
969
970 fc_fcp_pkt_release(fsp);
971 spin_lock_irqsave(lp->host->host_lock, flags);
972 /*
973 * while we dropped the lock multiple pkts could
974 * have been released, so we have to start over.
975 */
976 goto restart;
977 }
978 spin_unlock_irqrestore(lp->host->host_lock, flags);
979}
980
981static void fc_fcp_abort_io(struct fc_lport *lp)
982{
983 fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
984}
985
986/**
34f42a07 987 * fc_fcp_pkt_send() - send a fcp packet to the lower level.
42e9a92f
RL		 988 * @lp: fc lport
989 * @fsp: fc packet.
990 *
991 * This is called by upper layer protocol.
992 * Return : zero for success and -1 for failure
993 * Context : called from queuecommand which can be called from process
994 * or scsi soft irq.
995 * Locks : called with the host lock and irqs disabled.
996 */
997static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
998{
999 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
1000 int rc;
1001
1002 fsp->cmd->SCp.ptr = (char *)fsp;
1003 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1004 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1005
1006 int_to_scsilun(fsp->cmd->device->lun,
1007 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1008 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1009 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1010
1011 spin_unlock_irq(lp->host->host_lock);
1012 rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv);
1013 spin_lock_irq(lp->host->host_lock);
1014 if (rc)
1015 list_del(&fsp->list);
1016
1017 return rc;
1018}
1019
1020static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
1021 void (*resp)(struct fc_seq *,
1022 struct fc_frame *fp,
1023 void *arg))
1024{
1025 struct fc_frame *fp;
1026 struct fc_seq *seq;
1027 struct fc_rport *rport;
1028 struct fc_rport_libfc_priv *rp;
1029 const size_t len = sizeof(fsp->cdb_cmd);
1030 int rc = 0;
1031
1032 if (fc_fcp_lock_pkt(fsp))
1033 return 0;
1034
1035 fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
1036 if (!fp) {
1037 rc = -1;
1038 goto unlock;
1039 }
1040
1041 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
b277d2aa 1042 fr_fsp(fp) = fsp;
42e9a92f
RL		 1043 rport = fsp->rport;
1044 fsp->max_payload = rport->maxframe_size;
1045 rp = rport->dd_data;
1046
1047 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1048 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1049 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1050
1051 seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1052 if (!seq) {
1053 fc_frame_free(fp);
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 }
1318 fc_frame_free(fp);
1319retry:
1320 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1321 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1322 else
1323 fc_timeout_error(fsp);
1324}
1325
1326/*
1327 * Receive handler for REC ELS frame
1328 * if it is a reject then let the scsi layer to handle
1329 * the timeout. if it is a LS_ACC then if the io was not completed
1330 * then set the timeout and return otherwise complete the exchange
1331 * and tell the scsi layer to restart the I/O.
1332 */
1333static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1334{
1335 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1336 struct fc_els_rec_acc *recp;
1337 struct fc_els_ls_rjt *rjt;
1338 u32 e_stat;
1339 u8 opcode;
1340 u32 offset;
1341 enum dma_data_direction data_dir;
1342 enum fc_rctl r_ctl;
1343 struct fc_rport_libfc_priv *rp;
1344
1345 if (IS_ERR(fp)) {
1346 fc_fcp_rec_error(fsp, fp);
1347 return;
1348 }
1349
1350 if (fc_fcp_lock_pkt(fsp))
1351 goto out;
1352
1353 fsp->recov_retry = 0;
1354 opcode = fc_frame_payload_op(fp);
1355 if (opcode == ELS_LS_RJT) {
1356 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1357 switch (rjt->er_reason) {
1358 default:
7414705e
RL		 1359 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1360 "reason %d expl %d\n",
1361 fsp->rport->port_id, rjt->er_reason,
1362 rjt->er_explan);
42e9a92f
RL		 1363 /* fall through */
1364 case ELS_RJT_UNSUP:
7414705e 1365 FC_FCP_DBG(fsp, "device does not support REC\n");
42e9a92f
RL		 1366 rp = fsp->rport->dd_data;
1367 /*
1368 * if we do not spport RECs or got some bogus
1369 * reason then resetup timer so we check for
1370 * making progress.
1371 */
1372 rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1373 fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
1374 break;
1375 case ELS_RJT_LOGIC:
1376 case ELS_RJT_UNAB:
1377 /*
1378 * If no data transfer, the command frame got dropped
1379 * so we just retry. If data was transferred, we
1380 * lost the response but the target has no record,
1381 * so we abort and retry.
1382 */
1383 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1384 fsp->xfer_len == 0) {
1385 fc_fcp_retry_cmd(fsp);
1386 break;
1387 }
1388 fc_timeout_error(fsp);
1389 break;
1390 }
1391 } else if (opcode == ELS_LS_ACC) {
1392 if (fsp->state & FC_SRB_ABORTED)
1393 goto unlock_out;
1394
1395 data_dir = fsp->cmd->sc_data_direction;
1396 recp = fc_frame_payload_get(fp, sizeof(*recp));
1397 offset = ntohl(recp->reca_fc4value);
1398 e_stat = ntohl(recp->reca_e_stat);
1399
1400 if (e_stat & ESB_ST_COMPLETE) {
1401
1402 /*
1403 * The exchange is complete.
1404 *
1405 * For output, we must've lost the response.
1406 * For input, all data must've been sent.
1407 * We lost may have lost the response
1408 * (and a confirmation was requested) and maybe
1409 * some data.
1410 *
1411 * If all data received, send SRR
1412 * asking for response. If partial data received,
1413 * or gaps, SRR requests data at start of gap.
1414 * Recovery via SRR relies on in-order-delivery.
1415 */
1416 if (data_dir == DMA_TO_DEVICE) {
1417 r_ctl = FC_RCTL_DD_CMD_STATUS;
1418 } else if (fsp->xfer_contig_end == offset) {
1419 r_ctl = FC_RCTL_DD_CMD_STATUS;
1420 } else {
1421 offset = fsp->xfer_contig_end;
1422 r_ctl = FC_RCTL_DD_SOL_DATA;
1423 }
1424 fc_fcp_srr(fsp, r_ctl, offset);
1425 } else if (e_stat & ESB_ST_SEQ_INIT) {
1426
1427 /*
1428 * The remote port has the initiative, so just
1429 * keep waiting for it to complete.
1430 */
1431 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1432 } else {
1433
1434 /*
1435 * The exchange is incomplete, we have seq. initiative.
1436 * Lost response with requested confirmation,
1437 * lost confirmation, lost transfer ready or
1438 * lost write data.
1439 *
1440 * For output, if not all data was received, ask
1441 * for transfer ready to be repeated.
1442 *
1443 * If we received or sent all the data, send SRR to
1444 * request response.
1445 *
1446 * If we lost a response, we may have lost some read
1447 * data as well.
1448 */
1449 r_ctl = FC_RCTL_DD_SOL_DATA;
1450 if (data_dir == DMA_TO_DEVICE) {
1451 r_ctl = FC_RCTL_DD_CMD_STATUS;
1452 if (offset < fsp->data_len)
1453 r_ctl = FC_RCTL_DD_DATA_DESC;
1454 } else if (offset == fsp->xfer_contig_end) {
1455 r_ctl = FC_RCTL_DD_CMD_STATUS;
1456 } else if (fsp->xfer_contig_end < offset) {
1457 offset = fsp->xfer_contig_end;
1458 }
1459 fc_fcp_srr(fsp, r_ctl, offset);
1460 }
1461 }
1462unlock_out:
1463 fc_fcp_unlock_pkt(fsp);
1464out:
1465 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1466 fc_frame_free(fp);
1467}
1468
1469/*
1470 * Handle error response or timeout for REC exchange.
1471 */
1472static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1473{
1474 int error = PTR_ERR(fp);
1475
1476 if (fc_fcp_lock_pkt(fsp))
1477 goto out;
1478
1479 switch (error) {
1480 case -FC_EX_CLOSED:
1481 fc_fcp_retry_cmd(fsp);
1482 break;
1483
1484 default:
7414705e
RL		 1485 FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n",
1486 fsp, fsp->rport->port_id, error);
42e9a92f
RL		 1487 fsp->status_code = FC_CMD_PLOGO;
1488 /* fall through */
1489
1490 case -FC_EX_TIMEOUT:
1491 /*
1492 * Assume REC or LS_ACC was lost.
1493 * The exchange manager will have aborted REC, so retry.
1494 */
7414705e
RL		 1495 FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n",
1496 fsp->rport->port_id, error, fsp->recov_retry,
1497 FC_MAX_RECOV_RETRY);
42e9a92f
RL		 1498 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1499 fc_fcp_rec(fsp);
1500 else
1501 fc_timeout_error(fsp);
1502 break;
1503 }
1504 fc_fcp_unlock_pkt(fsp);
1505out:
1506 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1507}
1508
1509/*
1510 * Time out error routine:
1511 * abort's the I/O close the exchange and
1512 * send completion notification to scsi layer
1513 */
1514static void fc_timeout_error(struct fc_fcp_pkt *fsp)
1515{
1516 fsp->status_code = FC_CMD_TIME_OUT;
1517 fsp->cdb_status = 0;
1518 fsp->io_status = 0;
1519 /*
1520 * if this fails then we let the scsi command timer fire and
1521 * scsi-ml escalate.
1522 */
1523 fc_fcp_send_abort(fsp);
1524}
1525
1526/*
1527 * Sequence retransmission request.
1528 * This is called after receiving status but insufficient data, or
1529 * when expecting status but the request has timed out.
1530 */
1531static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1532{
1533 struct fc_lport *lp = fsp->lp;
1534 struct fc_rport *rport;
1535 struct fc_rport_libfc_priv *rp;
1536 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1537 struct fc_seq *seq;
1538 struct fcp_srr *srr;
1539 struct fc_frame *fp;
1540 u8 cdb_op;
1541
1542 rport = fsp->rport;
1543 rp = rport->dd_data;
1544 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1545
1546 if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
1547 goto retry; /* shouldn't happen */
1548 fp = fc_frame_alloc(lp, sizeof(*srr));
1549 if (!fp)
1550 goto retry;
1551
1552 srr = fc_frame_payload_get(fp, sizeof(*srr));
1553 memset(srr, 0, sizeof(*srr));
1554 srr->srr_op = ELS_SRR;
1555 srr->srr_ox_id = htons(ep->oxid);
1556 srr->srr_rx_id = htons(ep->rxid);
1557 srr->srr_r_ctl = r_ctl;
1558 srr->srr_rel_off = htonl(offset);
1559
1560 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1561 fc_host_port_id(rp->local_port->host), FC_TYPE_FCP,
1562 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
1563
1564 seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL,
1565 fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
1566 if (!seq) {
1567 fc_frame_free(fp);
1568 goto retry;
1569 }
1570 fsp->recov_seq = seq;
1571 fsp->xfer_len = offset;
1572 fsp->xfer_contig_end = offset;
1573 fsp->state &= ~FC_SRB_RCV_STATUS;
1574 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1575 return;
1576retry:
1577 fc_fcp_retry_cmd(fsp);
1578}
1579
1580/*
1581 * Handle response from SRR.
1582 */
1583static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1584{
1585 struct fc_fcp_pkt *fsp = arg;
1586 struct fc_frame_header *fh;
1587
1588 if (IS_ERR(fp)) {
1589 fc_fcp_srr_error(fsp, fp);
1590 return;
1591 }
1592
1593 if (fc_fcp_lock_pkt(fsp))
1594 goto out;
1595
1596 fh = fc_frame_header_get(fp);
1597 /*
1598 * BUG? fc_fcp_srr_error calls exch_done which would release
1599 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1600 * then fc_exch_timeout would be sending an abort. The exch_done
1601 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1602 * an abort response though.
1603 */
1604 if (fh->fh_type == FC_TYPE_BLS) {
1605 fc_fcp_unlock_pkt(fsp);
1606 return;
1607 }
1608
1609 fsp->recov_seq = NULL;
1610 switch (fc_frame_payload_op(fp)) {
1611 case ELS_LS_ACC:
1612 fsp->recov_retry = 0;
1613 fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
1614 break;
1615 case ELS_LS_RJT:
1616 default:
1617 fc_timeout_error(fsp);
1618 break;
1619 }
1620 fc_fcp_unlock_pkt(fsp);
1621 fsp->lp->tt.exch_done(seq);
1622out:
1623 fc_frame_free(fp);
1624 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1625}
1626
1627static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1628{
1629 if (fc_fcp_lock_pkt(fsp))
1630 goto out;
1631 fsp->lp->tt.exch_done(fsp->recov_seq);
1632 fsp->recov_seq = NULL;
1633 switch (PTR_ERR(fp)) {
1634 case -FC_EX_TIMEOUT:
1635 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1636 fc_fcp_rec(fsp);
1637 else
1638 fc_timeout_error(fsp);
1639 break;
1640 case -FC_EX_CLOSED: /* e.g., link failure */
1641 /* fall through */
1642 default:
1643 fc_fcp_retry_cmd(fsp);
1644 break;
1645 }
1646 fc_fcp_unlock_pkt(fsp);
1647out:
1648 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1649}
1650
1651static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
1652{
1653 /* lock ? */
bc0e17f6 1654 return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull;
42e9a92f
RL		 1655}
1656
1657/**
1658 * fc_queuecommand - The queuecommand function of the scsi template
1659 * @cmd: struct scsi_cmnd to be executed
1660 * @done: Callback function to be called when cmd is completed
1661 *
1662 * this is the i/o strategy routine, called by the scsi layer
1663 * this routine is called with holding the host_lock.
1664 */
1665int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
1666{
1667 struct fc_lport *lp;
1668 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1669 struct fc_fcp_pkt *fsp;
1670 struct fc_rport_libfc_priv *rp;
1671 int rval;
1672 int rc = 0;
1673 struct fcoe_dev_stats *stats;
1674
1675 lp = shost_priv(sc_cmd->device->host);
1676
1677 rval = fc_remote_port_chkready(rport);
1678 if (rval) {
1679 sc_cmd->result = rval;
1680 done(sc_cmd);
1681 goto out;
1682 }
1683
1684 if (!*(struct fc_remote_port **)rport->dd_data) {
1685 /*
1686 * rport is transitioning from blocked/deleted to
1687 * online
1688 */
1689 sc_cmd->result = DID_IMM_RETRY << 16;
1690 done(sc_cmd);
1691 goto out;
1692 }
1693
1694 rp = rport->dd_data;
1695
1696 if (!fc_fcp_lport_queue_ready(lp)) {
1697 rc = SCSI_MLQUEUE_HOST_BUSY;
1698 goto out;
1699 }
1700
1701 fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
1702 if (fsp == NULL) {
1703 rc = SCSI_MLQUEUE_HOST_BUSY;
1704 goto out;
1705 }
1706
1707 /*
1708 * build the libfc request pkt
1709 */
1710 fsp->cmd = sc_cmd; /* save the cmd */
1711 fsp->lp = lp; /* save the softc ptr */
1712 fsp->rport = rport; /* set the remote port ptr */
5e472d07 1713 fsp->xfer_ddp = FC_XID_UNKNOWN;
42e9a92f
RL		 1714 sc_cmd->scsi_done = done;
1715
1716 /*
1717 * set up the transfer length
1718 */
1719 fsp->data_len = scsi_bufflen(sc_cmd);
1720 fsp->xfer_len = 0;
1721
1722 /*
1723 * setup the data direction
1724 */
582b45bc 1725 stats = fc_lport_get_stats(lp);
42e9a92f
RL		 1726 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1727 fsp->req_flags = FC_SRB_READ;
1728 stats->InputRequests++;
1729 stats->InputMegabytes = fsp->data_len;
1730 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1731 fsp->req_flags = FC_SRB_WRITE;
1732 stats->OutputRequests++;
1733 stats->OutputMegabytes = fsp->data_len;
1734 } else {
1735 fsp->req_flags = 0;
1736 stats->ControlRequests++;
1737 }
1738
1739 fsp->tgt_flags = rp->flags;
1740
1741 init_timer(&fsp->timer);
1742 fsp->timer.data = (unsigned long)fsp;
1743
1744 /*
1745 * send it to the lower layer
1746 * if we get -1 return then put the request in the pending
1747 * queue.
1748 */
1749 rval = fc_fcp_pkt_send(lp, fsp);
1750 if (rval != 0) {
1751 fsp->state = FC_SRB_FREE;
1752 fc_fcp_pkt_release(fsp);
1753 rc = SCSI_MLQUEUE_HOST_BUSY;
1754 }
1755out:
1756 return rc;
1757}
1758EXPORT_SYMBOL(fc_queuecommand);
1759
1760/**
34f42a07 1761 * fc_io_compl() - Handle responses for completed commands
42e9a92f
RL		 1762 * @fsp: scsi packet
1763 *
1764 * Translates a error to a Linux SCSI error.
1765 *
1766 * The fcp packet lock must be held when calling.
1767 */
1768static void fc_io_compl(struct fc_fcp_pkt *fsp)
1769{
1770 struct fc_fcp_internal *si;
1771 struct scsi_cmnd *sc_cmd;
1772 struct fc_lport *lp;
1773 unsigned long flags;
1774
b277d2aa
YZ		 1775 /* release outstanding ddp context */
1776 fc_fcp_ddp_done(fsp);
1777
42e9a92f
RL		 1778 fsp->state |= FC_SRB_COMPL;
1779 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1780 spin_unlock_bh(&fsp->scsi_pkt_lock);
1781 del_timer_sync(&fsp->timer);
1782 spin_lock_bh(&fsp->scsi_pkt_lock);
1783 }
1784
1785 lp = fsp->lp;
1786 si = fc_get_scsi_internal(lp);
1787 spin_lock_irqsave(lp->host->host_lock, flags);
1788 if (!fsp->cmd) {
1789 spin_unlock_irqrestore(lp->host->host_lock, flags);
1790 return;
1791 }
1792
1793 /*
1794 * if a command timed out while we had to try and throttle IO
1795 * and it is now getting cleaned up, then we are about to
1796 * try again so clear the throttled flag incase we get more
1797 * time outs.
1798 */
1799 if (si->throttled && fsp->state & FC_SRB_NOMEM)
1800 si->throttled = 0;
1801
1802 sc_cmd = fsp->cmd;
1803 fsp->cmd = NULL;
1804
1805 if (!sc_cmd->SCp.ptr) {
1806 spin_unlock_irqrestore(lp->host->host_lock, flags);
1807 return;
1808 }
1809
1810 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1811 switch (fsp->status_code) {
1812 case FC_COMPLETE:
1813 if (fsp->cdb_status == 0) {
1814 /*
1815 * good I/O status
1816 */
1817 sc_cmd->result = DID_OK << 16;
1818 if (fsp->scsi_resid)
1819 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1820 } else if (fsp->cdb_status == QUEUE_FULL) {
1821 struct scsi_device *tmp_sdev;
1822 struct scsi_device *sdev = sc_cmd->device;
1823
1824 shost_for_each_device(tmp_sdev, sdev->host) {
1825 if (tmp_sdev->id != sdev->id)
1826 continue;
1827
1828 if (tmp_sdev->queue_depth > 1) {
1829 scsi_track_queue_full(tmp_sdev,
1830 tmp_sdev->
1831 queue_depth - 1);
1832 }
1833 }
1834 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1835 } else {
1836 /*
1837 * transport level I/O was ok but scsi
1838 * has non zero status
1839 */
1840 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1841 }
1842 break;
1843 case FC_ERROR:
1844 sc_cmd->result = DID_ERROR << 16;
1845 break;
1846 case FC_DATA_UNDRUN:
26d9cab5 1847 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
42e9a92f
RL		 1848 /*
1849 * scsi status is good but transport level
26d9cab5 1850 * underrun.
42e9a92f 1851 */
4347fa66
YZ		 1852 sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ?
1853 DID_OK : DID_ERROR) << 16;
42e9a92f
RL		 1854 } else {
1855 /*
1856 * scsi got underrun, this is an error
1857 */
1858 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1859 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1860 }
1861 break;
1862 case FC_DATA_OVRRUN:
1863 /*
1864 * overrun is an error
1865 */
1866 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1867 break;
1868 case FC_CMD_ABORTED:
d5e6054a 1869 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
42e9a92f
RL		 1870 break;
1871 case FC_CMD_TIME_OUT:
1872 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1873 break;
1874 case FC_CMD_RESET:
1875 sc_cmd->result = (DID_RESET << 16);
1876 break;
1877 case FC_HRD_ERROR:
1878 sc_cmd->result = (DID_NO_CONNECT << 16);
1879 break;
1880 default:
1881 sc_cmd->result = (DID_ERROR << 16);
1882 break;
1883 }
1884
1885 list_del(&fsp->list);
1886 sc_cmd->SCp.ptr = NULL;
1887 sc_cmd->scsi_done(sc_cmd);
1888 spin_unlock_irqrestore(lp->host->host_lock, flags);
1889
1890 /* release ref from initial allocation in queue command */
1891 fc_fcp_pkt_release(fsp);
1892}
1893
1894/**
34f42a07 1895 * fc_fcp_complete() - complete processing of a fcp packet
42e9a92f
RL		 1896 * @fsp: fcp packet
1897 *
1898 * This function may sleep if a fsp timer is pending.
1899 * The host lock must not be held by caller.
1900 */
1901void fc_fcp_complete(struct fc_fcp_pkt *fsp)
1902{
1903 if (fc_fcp_lock_pkt(fsp))
1904 return;
1905
1906 fc_fcp_complete_locked(fsp);
1907 fc_fcp_unlock_pkt(fsp);
1908}
1909EXPORT_SYMBOL(fc_fcp_complete);
1910
1911/**
34f42a07 1912 * fc_eh_abort() - Abort a command
42e9a92f
RL		 1913 * @sc_cmd: scsi command to abort
1914 *
34f42a07 1915 * From scsi host template.
42e9a92f
RL		 1916 * send ABTS to the target device and wait for the response
1917 * sc_cmd is the pointer to the command to be aborted.
1918 */
1919int fc_eh_abort(struct scsi_cmnd *sc_cmd)
1920{
1921 struct fc_fcp_pkt *fsp;
1922 struct fc_lport *lp;
1923 int rc = FAILED;
1924 unsigned long flags;
1925
1926 lp = shost_priv(sc_cmd->device->host);
1927 if (lp->state != LPORT_ST_READY)
1928 return rc;
bc0e17f6 1929 else if (!lp->link_up)
42e9a92f
RL		 1930 return rc;
1931
1932 spin_lock_irqsave(lp->host->host_lock, flags);
1933 fsp = CMD_SP(sc_cmd);
1934 if (!fsp) {
1935 /* command completed while scsi eh was setting up */
1936 spin_unlock_irqrestore(lp->host->host_lock, flags);
1937 return SUCCESS;
1938 }
1939 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
1940 fc_fcp_pkt_hold(fsp);
1941 spin_unlock_irqrestore(lp->host->host_lock, flags);
1942
1943 if (fc_fcp_lock_pkt(fsp)) {
1944 /* completed while we were waiting for timer to be deleted */
1945 rc = SUCCESS;
1946 goto release_pkt;
1947 }
1948
c340111d 1949 rc = fc_fcp_pkt_abort(fsp);
42e9a92f
RL		 1950 fc_fcp_unlock_pkt(fsp);
1951
1952release_pkt:
1953 fc_fcp_pkt_release(fsp);
1954 return rc;
1955}
1956EXPORT_SYMBOL(fc_eh_abort);
1957
1958/**
34f42a07 1959 * fc_eh_device_reset() Reset a single LUN
42e9a92f
RL		 1960 * @sc_cmd: scsi command
1961 *
1962 * Set from scsi host template to send tm cmd to the target and wait for the
1963 * response.
1964 */
1965int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1966{
1967 struct fc_lport *lp;
1968 struct fc_fcp_pkt *fsp;
1969 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1970 int rc = FAILED;
1971 struct fc_rport_libfc_priv *rp;
1972 int rval;
1973
1974 rval = fc_remote_port_chkready(rport);
1975 if (rval)
1976 goto out;
1977
1978 rp = rport->dd_data;
1979 lp = shost_priv(sc_cmd->device->host);
1980
1981 if (lp->state != LPORT_ST_READY)
1982 return rc;
1983
7414705e
RL		 1984 FC_SCSI_DBG(lp, "Resetting rport (%6x)\n", rport->port_id);
1985
42e9a92f
RL		 1986 fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
1987 if (fsp == NULL) {
7414705e 1988 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
42e9a92f
RL		 1989 sc_cmd->result = DID_NO_CONNECT << 16;
1990 goto out;
1991 }
1992
1993 /*
1994 * Build the libfc request pkt. Do not set the scsi cmnd, because
1995 * the sc passed in is not setup for execution like when sent
1996 * through the queuecommand callout.
1997 */
1998 fsp->lp = lp; /* save the softc ptr */
1999 fsp->rport = rport; /* set the remote port ptr */
2000
2001 /*
2002 * flush outstanding commands
2003 */
2004 rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2005 fsp->state = FC_SRB_FREE;
2006 fc_fcp_pkt_release(fsp);
2007
2008out:
2009 return rc;
2010}
2011EXPORT_SYMBOL(fc_eh_device_reset);
2012
2013/**
34f42a07 2014 * fc_eh_host_reset() - The reset function will reset the ports on the host.
42e9a92f
RL		 2015 * @sc_cmd: scsi command
2016 */
2017int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2018{
2019 struct Scsi_Host *shost = sc_cmd->device->host;
2020 struct fc_lport *lp = shost_priv(shost);
2021 unsigned long wait_tmo;
2022
7414705e
RL		 2023 FC_SCSI_DBG(lp, "Resetting host\n");
2024
42e9a92f
RL		 2025 lp->tt.lport_reset(lp);
2026 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2027 while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
2028 msleep(1000);
2029
2030 if (fc_fcp_lport_queue_ready(lp)) {
7414705e
RL		 2031 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2032 "on port (%6x)\n", fc_host_port_id(lp->host));
42e9a92f
RL		 2033 return SUCCESS;
2034 } else {
7414705e
RL		 2035 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2036 "port (%6x) is not ready.\n",
2037 fc_host_port_id(lp->host));
42e9a92f
RL		 2038 return FAILED;
2039 }
2040}
2041EXPORT_SYMBOL(fc_eh_host_reset);
2042
2043/**
34f42a07 2044 * fc_slave_alloc() - configure queue depth
42e9a92f
RL		 2045 * @sdev: scsi device
2046 *
2047 * Configures queue depth based on host's cmd_per_len. If not set
2048 * then we use the libfc default.
2049 */
2050int fc_slave_alloc(struct scsi_device *sdev)
2051{
2052 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2053 int queue_depth;
2054
2055 if (!rport || fc_remote_port_chkready(rport))
2056 return -ENXIO;
2057
2058 if (sdev->tagged_supported) {
2059 if (sdev->host->hostt->cmd_per_lun)
2060 queue_depth = sdev->host->hostt->cmd_per_lun;
2061 else
2062 queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
2063 scsi_activate_tcq(sdev, queue_depth);
2064 }
2065 return 0;
2066}
2067EXPORT_SYMBOL(fc_slave_alloc);
2068
2069int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2070{
2071 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2072 return sdev->queue_depth;
2073}
2074EXPORT_SYMBOL(fc_change_queue_depth);
2075
2076int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2077{
2078 if (sdev->tagged_supported) {
2079 scsi_set_tag_type(sdev, tag_type);
2080 if (tag_type)
2081 scsi_activate_tcq(sdev, sdev->queue_depth);
2082 else
2083 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2084 } else
2085 tag_type = 0;
2086
2087 return tag_type;
2088}
2089EXPORT_SYMBOL(fc_change_queue_type);
2090
2091void fc_fcp_destroy(struct fc_lport *lp)
2092{
2093 struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
2094
2095 if (!list_empty(&si->scsi_pkt_queue))
7414705e
RL		 2096 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2097 "port (%6x)\n", fc_host_port_id(lp->host));
42e9a92f
RL		 2098
2099 mempool_destroy(si->scsi_pkt_pool);
2100 kfree(si);
2101 lp->scsi_priv = NULL;
2102}
2103EXPORT_SYMBOL(fc_fcp_destroy);
2104
2105int fc_fcp_init(struct fc_lport *lp)
2106{
2107 int rc;
2108 struct fc_fcp_internal *si;
2109
2110 if (!lp->tt.fcp_cmd_send)
2111 lp->tt.fcp_cmd_send = fc_fcp_cmd_send;
2112
2113 if (!lp->tt.fcp_cleanup)
2114 lp->tt.fcp_cleanup = fc_fcp_cleanup;
2115
2116 if (!lp->tt.fcp_abort_io)
2117 lp->tt.fcp_abort_io = fc_fcp_abort_io;
2118
2119 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2120 if (!si)
2121 return -ENOMEM;
2122 lp->scsi_priv = si;
2123 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2124
2125 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2126 if (!si->scsi_pkt_pool) {
2127 rc = -ENOMEM;
2128 goto free_internal;
2129 }
2130 return 0;
2131
2132free_internal:
2133 kfree(si);
2134 return rc;
2135}
2136EXPORT_SYMBOL(fc_fcp_init);
2137
2138static int __init libfc_init(void)
2139{
2140 int rc;
2141
2142 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2143 sizeof(struct fc_fcp_pkt),
2144 0, SLAB_HWCACHE_ALIGN, NULL);
2145 if (scsi_pkt_cachep == NULL) {
7414705e
RL		 2146 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2147 "module load failed!");
42e9a92f
RL		 2148 return -ENOMEM;
2149 }
2150
2151 rc = fc_setup_exch_mgr();
2152 if (rc)
2153 goto destroy_pkt_cache;
2154
2155 rc = fc_setup_rport();
2156 if (rc)
2157 goto destroy_em;
2158
2159 return rc;
2160destroy_em:
2161 fc_destroy_exch_mgr();
2162destroy_pkt_cache:
2163 kmem_cache_destroy(scsi_pkt_cachep);
2164 return rc;
2165}
2166
2167static void __exit libfc_exit(void)
2168{
2169 kmem_cache_destroy(scsi_pkt_cachep);
2170 fc_destroy_exch_mgr();
2171 fc_destroy_rport();
2172}
2173
2174module_init(libfc_init);
2175module_exit(libfc_exit);
Linux kernel - Deliverables
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