Merge remote-tracking branch 's5p/for-next'
[linux-2.6/next.git] / drivers / scsi / libfc / fc_fcp.c
blobafb63c843144b483c362794f72e41de8689d3358
1 /*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 * Maintained at www.Open-FCoE.org
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
30 #include <linux/slab.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_device.h>
36 #include <scsi/scsi_cmnd.h>
38 #include <scsi/fc/fc_fc2.h>
40 #include <scsi/libfc.h>
41 #include <scsi/fc_encode.h>
43 #include "fc_libfc.h"
45 static struct kmem_cache *scsi_pkt_cachep;
47 /* SRB state definitions */
48 #define FC_SRB_FREE 0 /* cmd is free */
49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
57 #define FC_SRB_READ (1 << 1)
58 #define FC_SRB_WRITE (1 << 0)
61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
63 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
64 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
65 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
66 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
67 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
69 /**
70 * struct fc_fcp_internal - FCP layer internal data
71 * @scsi_pkt_pool: Memory pool to draw FCP packets from
72 * @scsi_queue_lock: Protects the scsi_pkt_queue
73 * @scsi_pkt_queue: Current FCP packets
74 * @last_can_queue_ramp_down_time: ramp down time
75 * @last_can_queue_ramp_up_time: ramp up time
76 * @max_can_queue: max can_queue size
78 struct fc_fcp_internal {
79 mempool_t *scsi_pkt_pool;
80 spinlock_t scsi_queue_lock;
81 struct list_head scsi_pkt_queue;
82 unsigned long last_can_queue_ramp_down_time;
83 unsigned long last_can_queue_ramp_up_time;
84 int max_can_queue;
87 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
90 * function prototypes
91 * FC scsi I/O related functions
93 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
94 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
95 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
96 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
97 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
98 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
99 static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
100 static void fc_fcp_timeout(unsigned long);
101 static void fc_fcp_rec(struct fc_fcp_pkt *);
102 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
103 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
104 static void fc_io_compl(struct fc_fcp_pkt *);
106 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
107 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
108 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
111 * command status codes
113 #define FC_COMPLETE 0
114 #define FC_CMD_ABORTED 1
115 #define FC_CMD_RESET 2
116 #define FC_CMD_PLOGO 3
117 #define FC_SNS_RCV 4
118 #define FC_TRANS_ERR 5
119 #define FC_DATA_OVRRUN 6
120 #define FC_DATA_UNDRUN 7
121 #define FC_ERROR 8
122 #define FC_HRD_ERROR 9
123 #define FC_CRC_ERROR 10
124 #define FC_TIMED_OUT 11
127 * Error recovery timeout values.
129 #define FC_SCSI_TM_TOV (10 * HZ)
130 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
131 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
133 #define FC_MAX_ERROR_CNT 5
134 #define FC_MAX_RECOV_RETRY 3
136 #define FC_FCP_DFLT_QUEUE_DEPTH 32
139 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
140 * @lport: The local port that the FCP packet is for
141 * @gfp: GFP flags for allocation
143 * Return value: fcp_pkt structure or null on allocation failure.
144 * Context: Can be called from process context, no lock is required.
146 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
149 struct fc_fcp_pkt *fsp;
151 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
152 if (fsp) {
153 memset(fsp, 0, sizeof(*fsp));
154 fsp->lp = lport;
155 fsp->xfer_ddp = FC_XID_UNKNOWN;
156 atomic_set(&fsp->ref_cnt, 1);
157 init_timer(&fsp->timer);
158 INIT_LIST_HEAD(&fsp->list);
159 spin_lock_init(&fsp->scsi_pkt_lock);
161 return fsp;
165 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
166 * @fsp: The FCP packet to be released
168 * Context: Can be called from process or interrupt context,
169 * no lock is required.
171 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
173 if (atomic_dec_and_test(&fsp->ref_cnt)) {
174 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
176 mempool_free(fsp, si->scsi_pkt_pool);
181 * fc_fcp_pkt_hold() - Hold a fcp_pkt
182 * @fsp: The FCP packet to be held
184 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
186 atomic_inc(&fsp->ref_cnt);
190 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
191 * @seq: The sequence that the FCP packet is on (required by destructor API)
192 * @fsp: The FCP packet to be released
194 * This routine is called by a destructor callback in the exch_seq_send()
195 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
196 * argument even though it is not used by this routine.
198 * Context: No locking required.
200 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
202 fc_fcp_pkt_release(fsp);
206 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
207 * @fsp: The FCP packet to be locked and incremented
209 * We should only return error if we return a command to SCSI-ml before
210 * getting a response. This can happen in cases where we send a abort, but
211 * do not wait for the response and the abort and command can be passing
212 * each other on the wire/network-layer.
214 * Note: this function locks the packet and gets a reference to allow
215 * callers to call the completion function while the lock is held and
216 * not have to worry about the packets refcount.
218 * TODO: Maybe we should just have callers grab/release the lock and
219 * have a function that they call to verify the fsp and grab a ref if
220 * needed.
222 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
224 spin_lock_bh(&fsp->scsi_pkt_lock);
225 if (fsp->state & FC_SRB_COMPL) {
226 spin_unlock_bh(&fsp->scsi_pkt_lock);
227 return -EPERM;
230 fc_fcp_pkt_hold(fsp);
231 return 0;
235 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
236 * reference count
237 * @fsp: The FCP packet to be unlocked and decremented
239 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
241 spin_unlock_bh(&fsp->scsi_pkt_lock);
242 fc_fcp_pkt_release(fsp);
246 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
247 * @fsp: The FCP packet to start a timer for
248 * @delay: The timeout period in jiffies
250 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
252 if (!(fsp->state & FC_SRB_COMPL))
253 mod_timer(&fsp->timer, jiffies + delay);
257 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
258 * fcp_pkt
259 * @fsp: The FCP packet to abort exchanges on
261 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
263 if (!fsp->seq_ptr)
264 return -EINVAL;
266 fsp->state |= FC_SRB_ABORT_PENDING;
267 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
271 * fc_fcp_retry_cmd() - Retry a fcp_pkt
272 * @fsp: The FCP packet to be retried
274 * Sets the status code to be FC_ERROR and then calls
275 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
276 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
277 * The SCSI-ml will retry the command.
279 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
281 if (fsp->seq_ptr) {
282 fsp->lp->tt.exch_done(fsp->seq_ptr);
283 fsp->seq_ptr = NULL;
286 fsp->state &= ~FC_SRB_ABORT_PENDING;
287 fsp->io_status = 0;
288 fsp->status_code = FC_ERROR;
289 fc_fcp_complete_locked(fsp);
293 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
294 * @fsp: The FCP packet that will manage the DDP frames
295 * @xid: The XID that will be used for the DDP exchange
297 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
299 struct fc_lport *lport;
301 lport = fsp->lp;
302 if ((fsp->req_flags & FC_SRB_READ) &&
303 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
304 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
305 scsi_sg_count(fsp->cmd)))
306 fsp->xfer_ddp = xid;
311 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
312 * DDP related resources for a fcp_pkt
313 * @fsp: The FCP packet that DDP had been used on
315 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
317 struct fc_lport *lport;
319 if (!fsp)
320 return;
322 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
323 return;
325 lport = fsp->lp;
326 if (lport->tt.ddp_done) {
327 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
328 fsp->xfer_ddp = FC_XID_UNKNOWN;
333 * fc_fcp_can_queue_ramp_up() - increases can_queue
334 * @lport: lport to ramp up can_queue
336 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
338 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
339 unsigned long flags;
340 int can_queue;
342 spin_lock_irqsave(lport->host->host_lock, flags);
344 if (si->last_can_queue_ramp_up_time &&
345 (time_before(jiffies, si->last_can_queue_ramp_up_time +
346 FC_CAN_QUEUE_PERIOD)))
347 goto unlock;
349 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
350 FC_CAN_QUEUE_PERIOD))
351 goto unlock;
353 si->last_can_queue_ramp_up_time = jiffies;
355 can_queue = lport->host->can_queue << 1;
356 if (can_queue >= si->max_can_queue) {
357 can_queue = si->max_can_queue;
358 si->last_can_queue_ramp_down_time = 0;
360 lport->host->can_queue = can_queue;
361 shost_printk(KERN_ERR, lport->host, "libfc: increased "
362 "can_queue to %d.\n", can_queue);
364 unlock:
365 spin_unlock_irqrestore(lport->host->host_lock, flags);
369 * fc_fcp_can_queue_ramp_down() - reduces can_queue
370 * @lport: lport to reduce can_queue
372 * If we are getting memory allocation failures, then we may
373 * be trying to execute too many commands. We let the running
374 * commands complete or timeout, then try again with a reduced
375 * can_queue. Eventually we will hit the point where we run
376 * on all reserved structs.
378 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
380 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
381 unsigned long flags;
382 int can_queue;
384 spin_lock_irqsave(lport->host->host_lock, flags);
386 if (si->last_can_queue_ramp_down_time &&
387 (time_before(jiffies, si->last_can_queue_ramp_down_time +
388 FC_CAN_QUEUE_PERIOD)))
389 goto unlock;
391 si->last_can_queue_ramp_down_time = jiffies;
393 can_queue = lport->host->can_queue;
394 can_queue >>= 1;
395 if (!can_queue)
396 can_queue = 1;
397 lport->host->can_queue = can_queue;
398 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
399 "Reducing can_queue to %d.\n", can_queue);
401 unlock:
402 spin_unlock_irqrestore(lport->host->host_lock, flags);
406 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
407 * @lport: fc lport struct
408 * @len: payload length
410 * Allocates fc_frame structure and buffer but if fails to allocate
411 * then reduce can_queue.
413 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
414 size_t len)
416 struct fc_frame *fp;
418 fp = fc_frame_alloc(lport, len);
419 if (likely(fp))
420 return fp;
422 /* error case */
423 fc_fcp_can_queue_ramp_down(lport);
424 return NULL;
428 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
429 * @fsp: The FCP packet the data is on
430 * @fp: The data frame
432 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
434 struct scsi_cmnd *sc = fsp->cmd;
435 struct fc_lport *lport = fsp->lp;
436 struct fcoe_dev_stats *stats;
437 struct fc_frame_header *fh;
438 size_t start_offset;
439 size_t offset;
440 u32 crc;
441 u32 copy_len = 0;
442 size_t len;
443 void *buf;
444 struct scatterlist *sg;
445 u32 nents;
446 u8 host_bcode = FC_COMPLETE;
448 fh = fc_frame_header_get(fp);
449 offset = ntohl(fh->fh_parm_offset);
450 start_offset = offset;
451 len = fr_len(fp) - sizeof(*fh);
452 buf = fc_frame_payload_get(fp, 0);
455 * if this I/O is ddped then clear it and initiate recovery since data
456 * frames are expected to be placed directly in that case.
458 * Indicate error to scsi-ml because something went wrong with the
459 * ddp handling to get us here.
461 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
462 fc_fcp_ddp_done(fsp);
463 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
464 host_bcode = FC_ERROR;
465 goto err;
467 if (offset + len > fsp->data_len) {
468 /* this should never happen */
469 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
470 fc_frame_crc_check(fp))
471 goto crc_err;
472 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
473 "data_len %x\n", len, offset, fsp->data_len);
475 /* Data is corrupted indicate scsi-ml should retry */
476 host_bcode = FC_DATA_OVRRUN;
477 goto err;
479 if (offset != fsp->xfer_len)
480 fsp->state |= FC_SRB_DISCONTIG;
482 sg = scsi_sglist(sc);
483 nents = scsi_sg_count(sc);
485 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
486 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
487 &offset, KM_SOFTIRQ0, NULL);
488 } else {
489 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
490 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
491 &offset, KM_SOFTIRQ0, &crc);
492 buf = fc_frame_payload_get(fp, 0);
493 if (len % 4)
494 crc = crc32(crc, buf + len, 4 - (len % 4));
496 if (~crc != le32_to_cpu(fr_crc(fp))) {
497 crc_err:
498 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
499 stats->ErrorFrames++;
500 /* per cpu count, not total count, but OK for limit */
501 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
502 printk(KERN_WARNING "libfc: CRC error on data "
503 "frame for port (%6.6x)\n",
504 lport->port_id);
505 put_cpu();
507 * Assume the frame is total garbage.
508 * We may have copied it over the good part
509 * of the buffer.
510 * If so, we need to retry the entire operation.
511 * Otherwise, ignore it.
513 if (fsp->state & FC_SRB_DISCONTIG) {
514 host_bcode = FC_CRC_ERROR;
515 goto err;
517 return;
521 if (fsp->xfer_contig_end == start_offset)
522 fsp->xfer_contig_end += copy_len;
523 fsp->xfer_len += copy_len;
526 * In the very rare event that this data arrived after the response
527 * and completes the transfer, call the completion handler.
529 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
530 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
531 fc_fcp_complete_locked(fsp);
532 return;
533 err:
534 fc_fcp_recovery(fsp, host_bcode);
538 * fc_fcp_send_data() - Send SCSI data to a target
539 * @fsp: The FCP packet the data is on
540 * @sp: The sequence the data is to be sent on
541 * @offset: The starting offset for this data request
542 * @seq_blen: The burst length for this data request
544 * Called after receiving a Transfer Ready data descriptor.
545 * If the LLD is capable of sequence offload then send down the
546 * seq_blen amount of data in single frame, otherwise send
547 * multiple frames of the maximum frame payload supported by
548 * the target port.
550 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
551 size_t offset, size_t seq_blen)
553 struct fc_exch *ep;
554 struct scsi_cmnd *sc;
555 struct scatterlist *sg;
556 struct fc_frame *fp = NULL;
557 struct fc_lport *lport = fsp->lp;
558 struct page *page;
559 size_t remaining;
560 size_t t_blen;
561 size_t tlen;
562 size_t sg_bytes;
563 size_t frame_offset, fh_parm_offset;
564 size_t off;
565 int error;
566 void *data = NULL;
567 void *page_addr;
568 int using_sg = lport->sg_supp;
569 u32 f_ctl;
571 WARN_ON(seq_blen <= 0);
572 if (unlikely(offset + seq_blen > fsp->data_len)) {
573 /* this should never happen */
574 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
575 "offset %zx\n", seq_blen, offset);
576 fc_fcp_send_abort(fsp);
577 return 0;
578 } else if (offset != fsp->xfer_len) {
579 /* Out of Order Data Request - no problem, but unexpected. */
580 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
581 "seq_blen %zx offset %zx\n", seq_blen, offset);
585 * if LLD is capable of seq_offload then set transport
586 * burst length (t_blen) to seq_blen, otherwise set t_blen
587 * to max FC frame payload previously set in fsp->max_payload.
589 t_blen = fsp->max_payload;
590 if (lport->seq_offload) {
591 t_blen = min(seq_blen, (size_t)lport->lso_max);
592 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
593 fsp, seq_blen, lport->lso_max, t_blen);
596 if (t_blen > 512)
597 t_blen &= ~(512 - 1); /* round down to block size */
598 sc = fsp->cmd;
600 remaining = seq_blen;
601 fh_parm_offset = frame_offset = offset;
602 tlen = 0;
603 seq = lport->tt.seq_start_next(seq);
604 f_ctl = FC_FC_REL_OFF;
605 WARN_ON(!seq);
607 sg = scsi_sglist(sc);
609 while (remaining > 0 && sg) {
610 if (offset >= sg->length) {
611 offset -= sg->length;
612 sg = sg_next(sg);
613 continue;
615 if (!fp) {
616 tlen = min(t_blen, remaining);
619 * TODO. Temporary workaround. fc_seq_send() can't
620 * handle odd lengths in non-linear skbs.
621 * This will be the final fragment only.
623 if (tlen % 4)
624 using_sg = 0;
625 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
626 if (!fp)
627 return -ENOMEM;
629 data = fc_frame_header_get(fp) + 1;
630 fh_parm_offset = frame_offset;
631 fr_max_payload(fp) = fsp->max_payload;
634 off = offset + sg->offset;
635 sg_bytes = min(tlen, sg->length - offset);
636 sg_bytes = min(sg_bytes,
637 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
638 page = sg_page(sg) + (off >> PAGE_SHIFT);
639 if (using_sg) {
640 get_page(page);
641 skb_fill_page_desc(fp_skb(fp),
642 skb_shinfo(fp_skb(fp))->nr_frags,
643 page, off & ~PAGE_MASK, sg_bytes);
644 fp_skb(fp)->data_len += sg_bytes;
645 fr_len(fp) += sg_bytes;
646 fp_skb(fp)->truesize += PAGE_SIZE;
647 } else {
649 * The scatterlist item may be bigger than PAGE_SIZE,
650 * but we must not cross pages inside the kmap.
652 page_addr = kmap_atomic(page, KM_SOFTIRQ0);
653 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
654 sg_bytes);
655 kunmap_atomic(page_addr, KM_SOFTIRQ0);
656 data += sg_bytes;
658 offset += sg_bytes;
659 frame_offset += sg_bytes;
660 tlen -= sg_bytes;
661 remaining -= sg_bytes;
663 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
664 (tlen))
665 continue;
668 * Send sequence with transfer sequence initiative in case
669 * this is last FCP frame of the sequence.
671 if (remaining == 0)
672 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
674 ep = fc_seq_exch(seq);
675 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
676 FC_TYPE_FCP, f_ctl, fh_parm_offset);
679 * send fragment using for a sequence.
681 error = lport->tt.seq_send(lport, seq, fp);
682 if (error) {
683 WARN_ON(1); /* send error should be rare */
684 return error;
686 fp = NULL;
688 fsp->xfer_len += seq_blen; /* premature count? */
689 return 0;
693 * fc_fcp_abts_resp() - Receive an ABTS response
694 * @fsp: The FCP packet that is being aborted
695 * @fp: The response frame
697 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
699 int ba_done = 1;
700 struct fc_ba_rjt *brp;
701 struct fc_frame_header *fh;
703 fh = fc_frame_header_get(fp);
704 switch (fh->fh_r_ctl) {
705 case FC_RCTL_BA_ACC:
706 break;
707 case FC_RCTL_BA_RJT:
708 brp = fc_frame_payload_get(fp, sizeof(*brp));
709 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
710 break;
711 /* fall thru */
712 default:
714 * we will let the command timeout
715 * and scsi-ml recover in this case,
716 * therefore cleared the ba_done flag.
718 ba_done = 0;
721 if (ba_done) {
722 fsp->state |= FC_SRB_ABORTED;
723 fsp->state &= ~FC_SRB_ABORT_PENDING;
725 if (fsp->wait_for_comp)
726 complete(&fsp->tm_done);
727 else
728 fc_fcp_complete_locked(fsp);
733 * fc_fcp_recv() - Receive an FCP frame
734 * @seq: The sequence the frame is on
735 * @fp: The received frame
736 * @arg: The related FCP packet
738 * Context: Called from Soft IRQ context. Can not be called
739 * holding the FCP packet list lock.
741 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
743 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
744 struct fc_lport *lport = fsp->lp;
745 struct fc_frame_header *fh;
746 struct fcp_txrdy *dd;
747 u8 r_ctl;
748 int rc = 0;
750 if (IS_ERR(fp)) {
751 fc_fcp_error(fsp, fp);
752 return;
755 fh = fc_frame_header_get(fp);
756 r_ctl = fh->fh_r_ctl;
758 if (lport->state != LPORT_ST_READY)
759 goto out;
760 if (fc_fcp_lock_pkt(fsp))
761 goto out;
762 fsp->last_pkt_time = jiffies;
764 if (fh->fh_type == FC_TYPE_BLS) {
765 fc_fcp_abts_resp(fsp, fp);
766 goto unlock;
769 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
770 goto unlock;
772 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
774 * received XFER RDY from the target
775 * need to send data to the target
777 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
778 dd = fc_frame_payload_get(fp, sizeof(*dd));
779 WARN_ON(!dd);
781 rc = fc_fcp_send_data(fsp, seq,
782 (size_t) ntohl(dd->ft_data_ro),
783 (size_t) ntohl(dd->ft_burst_len));
784 if (!rc)
785 seq->rec_data = fsp->xfer_len;
786 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
788 * received a DATA frame
789 * next we will copy the data to the system buffer
791 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
792 fc_fcp_recv_data(fsp, fp);
793 seq->rec_data = fsp->xfer_contig_end;
794 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
795 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
797 fc_fcp_resp(fsp, fp);
798 } else {
799 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
801 unlock:
802 fc_fcp_unlock_pkt(fsp);
803 out:
804 fc_frame_free(fp);
808 * fc_fcp_resp() - Handler for FCP responses
809 * @fsp: The FCP packet the response is for
810 * @fp: The response frame
812 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
814 struct fc_frame_header *fh;
815 struct fcp_resp *fc_rp;
816 struct fcp_resp_ext *rp_ex;
817 struct fcp_resp_rsp_info *fc_rp_info;
818 u32 plen;
819 u32 expected_len;
820 u32 respl = 0;
821 u32 snsl = 0;
822 u8 flags = 0;
824 plen = fr_len(fp);
825 fh = (struct fc_frame_header *)fr_hdr(fp);
826 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
827 goto len_err;
828 plen -= sizeof(*fh);
829 fc_rp = (struct fcp_resp *)(fh + 1);
830 fsp->cdb_status = fc_rp->fr_status;
831 flags = fc_rp->fr_flags;
832 fsp->scsi_comp_flags = flags;
833 expected_len = fsp->data_len;
835 /* if ddp, update xfer len */
836 fc_fcp_ddp_done(fsp);
838 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
839 rp_ex = (void *)(fc_rp + 1);
840 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
841 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
842 goto len_err;
843 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
844 if (flags & FCP_RSP_LEN_VAL) {
845 respl = ntohl(rp_ex->fr_rsp_len);
846 if (respl != sizeof(*fc_rp_info))
847 goto len_err;
848 if (fsp->wait_for_comp) {
849 /* Abuse cdb_status for rsp code */
850 fsp->cdb_status = fc_rp_info->rsp_code;
851 complete(&fsp->tm_done);
853 * tmfs will not have any scsi cmd so
854 * exit here
856 return;
859 if (flags & FCP_SNS_LEN_VAL) {
860 snsl = ntohl(rp_ex->fr_sns_len);
861 if (snsl > SCSI_SENSE_BUFFERSIZE)
862 snsl = SCSI_SENSE_BUFFERSIZE;
863 memcpy(fsp->cmd->sense_buffer,
864 (char *)fc_rp_info + respl, snsl);
867 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
868 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
869 goto len_err;
870 if (flags & FCP_RESID_UNDER) {
871 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
873 * The cmnd->underflow is the minimum number of
874 * bytes that must be transferred for this
875 * command. Provided a sense condition is not
876 * present, make sure the actual amount
877 * transferred is at least the underflow value
878 * or fail.
880 if (!(flags & FCP_SNS_LEN_VAL) &&
881 (fc_rp->fr_status == 0) &&
882 (scsi_bufflen(fsp->cmd) -
883 fsp->scsi_resid) < fsp->cmd->underflow)
884 goto err;
885 expected_len -= fsp->scsi_resid;
886 } else {
887 fsp->status_code = FC_ERROR;
891 fsp->state |= FC_SRB_RCV_STATUS;
894 * Check for missing or extra data frames.
896 if (unlikely(fsp->xfer_len != expected_len)) {
897 if (fsp->xfer_len < expected_len) {
899 * Some data may be queued locally,
900 * Wait a at least one jiffy to see if it is delivered.
901 * If this expires without data, we may do SRR.
903 fc_fcp_timer_set(fsp, 2);
904 return;
906 fsp->status_code = FC_DATA_OVRRUN;
907 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
908 "len %x, data len %x\n",
909 fsp->rport->port_id,
910 fsp->xfer_len, expected_len, fsp->data_len);
912 fc_fcp_complete_locked(fsp);
913 return;
915 len_err:
916 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
917 "snsl %u\n", flags, fr_len(fp), respl, snsl);
918 err:
919 fsp->status_code = FC_ERROR;
920 fc_fcp_complete_locked(fsp);
924 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
925 * fcp_pkt lock held
926 * @fsp: The FCP packet to be completed
928 * This function may sleep if a timer is pending. The packet lock must be
929 * held, and the host lock must not be held.
931 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
933 struct fc_lport *lport = fsp->lp;
934 struct fc_seq *seq;
935 struct fc_exch *ep;
936 u32 f_ctl;
938 if (fsp->state & FC_SRB_ABORT_PENDING)
939 return;
941 if (fsp->state & FC_SRB_ABORTED) {
942 if (!fsp->status_code)
943 fsp->status_code = FC_CMD_ABORTED;
944 } else {
946 * Test for transport underrun, independent of response
947 * underrun status.
949 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
950 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
951 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
952 fsp->status_code = FC_DATA_UNDRUN;
953 fsp->io_status = 0;
957 seq = fsp->seq_ptr;
958 if (seq) {
959 fsp->seq_ptr = NULL;
960 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
961 struct fc_frame *conf_frame;
962 struct fc_seq *csp;
964 csp = lport->tt.seq_start_next(seq);
965 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
966 if (conf_frame) {
967 f_ctl = FC_FC_SEQ_INIT;
968 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
969 ep = fc_seq_exch(seq);
970 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
971 ep->did, ep->sid,
972 FC_TYPE_FCP, f_ctl, 0);
973 lport->tt.seq_send(lport, csp, conf_frame);
976 lport->tt.exch_done(seq);
979 * Some resets driven by SCSI are not I/Os and do not have
980 * SCSI commands associated with the requests. We should not
981 * call I/O completion if we do not have a SCSI command.
983 if (fsp->cmd)
984 fc_io_compl(fsp);
988 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
989 * @fsp: The FCP packet whose exchanges should be canceled
990 * @error: The reason for the cancellation
992 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
994 struct fc_lport *lport = fsp->lp;
996 if (fsp->seq_ptr) {
997 lport->tt.exch_done(fsp->seq_ptr);
998 fsp->seq_ptr = NULL;
1000 fsp->status_code = error;
1004 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1005 * @lport: The local port whose exchanges should be canceled
1006 * @id: The target's ID
1007 * @lun: The LUN
1008 * @error: The reason for cancellation
1010 * If lun or id is -1, they are ignored.
1012 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1013 unsigned int lun, int error)
1015 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1016 struct fc_fcp_pkt *fsp;
1017 struct scsi_cmnd *sc_cmd;
1018 unsigned long flags;
1020 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1021 restart:
1022 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1023 sc_cmd = fsp->cmd;
1024 if (id != -1 && scmd_id(sc_cmd) != id)
1025 continue;
1027 if (lun != -1 && sc_cmd->device->lun != lun)
1028 continue;
1030 fc_fcp_pkt_hold(fsp);
1031 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1033 if (!fc_fcp_lock_pkt(fsp)) {
1034 fc_fcp_cleanup_cmd(fsp, error);
1035 fc_io_compl(fsp);
1036 fc_fcp_unlock_pkt(fsp);
1039 fc_fcp_pkt_release(fsp);
1040 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1042 * while we dropped the lock multiple pkts could
1043 * have been released, so we have to start over.
1045 goto restart;
1047 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1051 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1052 * @lport: The local port whose exchanges are to be aborted
1054 static void fc_fcp_abort_io(struct fc_lport *lport)
1056 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1060 * fc_fcp_pkt_send() - Send a fcp_pkt
1061 * @lport: The local port to send the FCP packet on
1062 * @fsp: The FCP packet to send
1064 * Return: Zero for success and -1 for failure
1065 * Locks: Called without locks held
1067 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1069 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1070 unsigned long flags;
1071 int rc;
1073 fsp->cmd->SCp.ptr = (char *)fsp;
1074 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1075 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1077 int_to_scsilun(fsp->cmd->device->lun,
1078 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1079 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1081 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1082 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1083 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1084 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1085 if (unlikely(rc)) {
1086 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1087 fsp->cmd->SCp.ptr = NULL;
1088 list_del(&fsp->list);
1089 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1092 return rc;
1096 * get_fsp_rec_tov() - Helper function to get REC_TOV
1097 * @fsp: the FCP packet
1099 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
1101 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
1103 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
1105 return msecs_to_jiffies(rpriv->e_d_tov) + HZ;
1109 * fc_fcp_cmd_send() - Send a FCP command
1110 * @lport: The local port to send the command on
1111 * @fsp: The FCP packet the command is on
1112 * @resp: The handler for the response
1114 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1115 void (*resp)(struct fc_seq *,
1116 struct fc_frame *fp,
1117 void *arg))
1119 struct fc_frame *fp;
1120 struct fc_seq *seq;
1121 struct fc_rport *rport;
1122 struct fc_rport_libfc_priv *rpriv;
1123 const size_t len = sizeof(fsp->cdb_cmd);
1124 int rc = 0;
1126 if (fc_fcp_lock_pkt(fsp))
1127 return 0;
1129 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1130 if (!fp) {
1131 rc = -1;
1132 goto unlock;
1135 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1136 fr_fsp(fp) = fsp;
1137 rport = fsp->rport;
1138 fsp->max_payload = rport->maxframe_size;
1139 rpriv = rport->dd_data;
1141 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1142 rpriv->local_port->port_id, FC_TYPE_FCP,
1143 FC_FCTL_REQ, 0);
1145 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1146 fsp, 0);
1147 if (!seq) {
1148 rc = -1;
1149 goto unlock;
1151 fsp->last_pkt_time = jiffies;
1152 fsp->seq_ptr = seq;
1153 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1155 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1156 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1157 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1159 unlock:
1160 fc_fcp_unlock_pkt(fsp);
1161 return rc;
1165 * fc_fcp_error() - Handler for FCP layer errors
1166 * @fsp: The FCP packet the error is on
1167 * @fp: The frame that has errored
1169 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1171 int error = PTR_ERR(fp);
1173 if (fc_fcp_lock_pkt(fsp))
1174 return;
1176 if (error == -FC_EX_CLOSED) {
1177 fc_fcp_retry_cmd(fsp);
1178 goto unlock;
1182 * clear abort pending, because the lower layer
1183 * decided to force completion.
1185 fsp->state &= ~FC_SRB_ABORT_PENDING;
1186 fsp->status_code = FC_CMD_PLOGO;
1187 fc_fcp_complete_locked(fsp);
1188 unlock:
1189 fc_fcp_unlock_pkt(fsp);
1193 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1194 * @fsp: The FCP packet to abort on
1196 * Called to send an abort and then wait for abort completion
1198 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1200 int rc = FAILED;
1201 unsigned long ticks_left;
1203 if (fc_fcp_send_abort(fsp))
1204 return FAILED;
1206 init_completion(&fsp->tm_done);
1207 fsp->wait_for_comp = 1;
1209 spin_unlock_bh(&fsp->scsi_pkt_lock);
1210 ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1211 FC_SCSI_TM_TOV);
1212 spin_lock_bh(&fsp->scsi_pkt_lock);
1213 fsp->wait_for_comp = 0;
1215 if (!ticks_left) {
1216 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1217 } else if (fsp->state & FC_SRB_ABORTED) {
1218 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1219 rc = SUCCESS;
1220 fc_fcp_complete_locked(fsp);
1223 return rc;
1227 * fc_lun_reset_send() - Send LUN reset command
1228 * @data: The FCP packet that identifies the LUN to be reset
1230 static void fc_lun_reset_send(unsigned long data)
1232 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1233 struct fc_lport *lport = fsp->lp;
1235 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1236 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1237 return;
1238 if (fc_fcp_lock_pkt(fsp))
1239 return;
1240 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1241 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1242 fc_fcp_unlock_pkt(fsp);
1247 * fc_lun_reset() - Send a LUN RESET command to a device
1248 * and wait for the reply
1249 * @lport: The local port to sent the command on
1250 * @fsp: The FCP packet that identifies the LUN to be reset
1251 * @id: The SCSI command ID
1252 * @lun: The LUN ID to be reset
1254 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1255 unsigned int id, unsigned int lun)
1257 int rc;
1259 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1260 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1261 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1263 fsp->wait_for_comp = 1;
1264 init_completion(&fsp->tm_done);
1266 fc_lun_reset_send((unsigned long)fsp);
1269 * wait for completion of reset
1270 * after that make sure all commands are terminated
1272 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1274 spin_lock_bh(&fsp->scsi_pkt_lock);
1275 fsp->state |= FC_SRB_COMPL;
1276 spin_unlock_bh(&fsp->scsi_pkt_lock);
1278 del_timer_sync(&fsp->timer);
1280 spin_lock_bh(&fsp->scsi_pkt_lock);
1281 if (fsp->seq_ptr) {
1282 lport->tt.exch_done(fsp->seq_ptr);
1283 fsp->seq_ptr = NULL;
1285 fsp->wait_for_comp = 0;
1286 spin_unlock_bh(&fsp->scsi_pkt_lock);
1288 if (!rc) {
1289 FC_SCSI_DBG(lport, "lun reset failed\n");
1290 return FAILED;
1293 /* cdb_status holds the tmf's rsp code */
1294 if (fsp->cdb_status != FCP_TMF_CMPL)
1295 return FAILED;
1297 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1298 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1299 return SUCCESS;
1303 * fc_tm_done() - Task Management response handler
1304 * @seq: The sequence that the response is on
1305 * @fp: The response frame
1306 * @arg: The FCP packet the response is for
1308 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1310 struct fc_fcp_pkt *fsp = arg;
1311 struct fc_frame_header *fh;
1313 if (IS_ERR(fp)) {
1315 * If there is an error just let it timeout or wait
1316 * for TMF to be aborted if it timedout.
1318 * scsi-eh will escalate for when either happens.
1320 return;
1323 if (fc_fcp_lock_pkt(fsp))
1324 goto out;
1327 * raced with eh timeout handler.
1329 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1330 goto out_unlock;
1332 fh = fc_frame_header_get(fp);
1333 if (fh->fh_type != FC_TYPE_BLS)
1334 fc_fcp_resp(fsp, fp);
1335 fsp->seq_ptr = NULL;
1336 fsp->lp->tt.exch_done(seq);
1337 out_unlock:
1338 fc_fcp_unlock_pkt(fsp);
1339 out:
1340 fc_frame_free(fp);
1344 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1345 * @lport: The local port to be cleaned up
1347 static void fc_fcp_cleanup(struct fc_lport *lport)
1349 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1353 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1354 * @data: The FCP packet that has timed out
1356 * If REC is supported then just issue it and return. The REC exchange will
1357 * complete or time out and recovery can continue at that point. Otherwise,
1358 * if the response has been received without all the data it has been
1359 * ER_TIMEOUT since the response was received. If the response has not been
1360 * received we see if data was received recently. If it has been then we
1361 * continue waiting, otherwise, we abort the command.
1363 static void fc_fcp_timeout(unsigned long data)
1365 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1366 struct fc_rport *rport = fsp->rport;
1367 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1369 if (fc_fcp_lock_pkt(fsp))
1370 return;
1372 if (fsp->cdb_cmd.fc_tm_flags)
1373 goto unlock;
1375 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1377 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1378 fc_fcp_rec(fsp);
1379 else if (fsp->state & FC_SRB_RCV_STATUS)
1380 fc_fcp_complete_locked(fsp);
1381 else
1382 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1383 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1384 unlock:
1385 fc_fcp_unlock_pkt(fsp);
1389 * fc_fcp_rec() - Send a REC ELS request
1390 * @fsp: The FCP packet to send the REC request on
1392 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1394 struct fc_lport *lport;
1395 struct fc_frame *fp;
1396 struct fc_rport *rport;
1397 struct fc_rport_libfc_priv *rpriv;
1399 lport = fsp->lp;
1400 rport = fsp->rport;
1401 rpriv = rport->dd_data;
1402 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1403 fsp->status_code = FC_HRD_ERROR;
1404 fsp->io_status = 0;
1405 fc_fcp_complete_locked(fsp);
1406 return;
1409 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1410 if (!fp)
1411 goto retry;
1413 fr_seq(fp) = fsp->seq_ptr;
1414 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1415 rpriv->local_port->port_id, FC_TYPE_ELS,
1416 FC_FCTL_REQ, 0);
1417 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1418 fc_fcp_rec_resp, fsp,
1419 2 * lport->r_a_tov)) {
1420 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1421 return;
1423 retry:
1424 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1425 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1426 else
1427 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1431 * fc_fcp_rec_resp() - Handler for REC ELS responses
1432 * @seq: The sequence the response is on
1433 * @fp: The response frame
1434 * @arg: The FCP packet the response is on
1436 * If the response is a reject then the scsi layer will handle
1437 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1438 * set the timeout and return. If the I/O was completed then complete the
1439 * exchange and tell the SCSI layer.
1441 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1443 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1444 struct fc_els_rec_acc *recp;
1445 struct fc_els_ls_rjt *rjt;
1446 u32 e_stat;
1447 u8 opcode;
1448 u32 offset;
1449 enum dma_data_direction data_dir;
1450 enum fc_rctl r_ctl;
1451 struct fc_rport_libfc_priv *rpriv;
1453 if (IS_ERR(fp)) {
1454 fc_fcp_rec_error(fsp, fp);
1455 return;
1458 if (fc_fcp_lock_pkt(fsp))
1459 goto out;
1461 fsp->recov_retry = 0;
1462 opcode = fc_frame_payload_op(fp);
1463 if (opcode == ELS_LS_RJT) {
1464 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1465 switch (rjt->er_reason) {
1466 default:
1467 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1468 "reason %d expl %d\n",
1469 fsp->rport->port_id, rjt->er_reason,
1470 rjt->er_explan);
1471 /* fall through */
1472 case ELS_RJT_UNSUP:
1473 FC_FCP_DBG(fsp, "device does not support REC\n");
1474 rpriv = fsp->rport->dd_data;
1476 * if we do not spport RECs or got some bogus
1477 * reason then resetup timer so we check for
1478 * making progress.
1480 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1481 break;
1482 case ELS_RJT_LOGIC:
1483 case ELS_RJT_UNAB:
1485 * If no data transfer, the command frame got dropped
1486 * so we just retry. If data was transferred, we
1487 * lost the response but the target has no record,
1488 * so we abort and retry.
1490 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1491 fsp->xfer_len == 0) {
1492 fc_fcp_retry_cmd(fsp);
1493 break;
1495 fc_fcp_recovery(fsp, FC_ERROR);
1496 break;
1498 } else if (opcode == ELS_LS_ACC) {
1499 if (fsp->state & FC_SRB_ABORTED)
1500 goto unlock_out;
1502 data_dir = fsp->cmd->sc_data_direction;
1503 recp = fc_frame_payload_get(fp, sizeof(*recp));
1504 offset = ntohl(recp->reca_fc4value);
1505 e_stat = ntohl(recp->reca_e_stat);
1507 if (e_stat & ESB_ST_COMPLETE) {
1510 * The exchange is complete.
1512 * For output, we must've lost the response.
1513 * For input, all data must've been sent.
1514 * We lost may have lost the response
1515 * (and a confirmation was requested) and maybe
1516 * some data.
1518 * If all data received, send SRR
1519 * asking for response. If partial data received,
1520 * or gaps, SRR requests data at start of gap.
1521 * Recovery via SRR relies on in-order-delivery.
1523 if (data_dir == DMA_TO_DEVICE) {
1524 r_ctl = FC_RCTL_DD_CMD_STATUS;
1525 } else if (fsp->xfer_contig_end == offset) {
1526 r_ctl = FC_RCTL_DD_CMD_STATUS;
1527 } else {
1528 offset = fsp->xfer_contig_end;
1529 r_ctl = FC_RCTL_DD_SOL_DATA;
1531 fc_fcp_srr(fsp, r_ctl, offset);
1532 } else if (e_stat & ESB_ST_SEQ_INIT) {
1534 * The remote port has the initiative, so just
1535 * keep waiting for it to complete.
1537 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1538 } else {
1541 * The exchange is incomplete, we have seq. initiative.
1542 * Lost response with requested confirmation,
1543 * lost confirmation, lost transfer ready or
1544 * lost write data.
1546 * For output, if not all data was received, ask
1547 * for transfer ready to be repeated.
1549 * If we received or sent all the data, send SRR to
1550 * request response.
1552 * If we lost a response, we may have lost some read
1553 * data as well.
1555 r_ctl = FC_RCTL_DD_SOL_DATA;
1556 if (data_dir == DMA_TO_DEVICE) {
1557 r_ctl = FC_RCTL_DD_CMD_STATUS;
1558 if (offset < fsp->data_len)
1559 r_ctl = FC_RCTL_DD_DATA_DESC;
1560 } else if (offset == fsp->xfer_contig_end) {
1561 r_ctl = FC_RCTL_DD_CMD_STATUS;
1562 } else if (fsp->xfer_contig_end < offset) {
1563 offset = fsp->xfer_contig_end;
1565 fc_fcp_srr(fsp, r_ctl, offset);
1568 unlock_out:
1569 fc_fcp_unlock_pkt(fsp);
1570 out:
1571 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1572 fc_frame_free(fp);
1576 * fc_fcp_rec_error() - Handler for REC errors
1577 * @fsp: The FCP packet the error is on
1578 * @fp: The REC frame
1580 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1582 int error = PTR_ERR(fp);
1584 if (fc_fcp_lock_pkt(fsp))
1585 goto out;
1587 switch (error) {
1588 case -FC_EX_CLOSED:
1589 fc_fcp_retry_cmd(fsp);
1590 break;
1592 default:
1593 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1594 fsp, fsp->rport->port_id, error);
1595 fsp->status_code = FC_CMD_PLOGO;
1596 /* fall through */
1598 case -FC_EX_TIMEOUT:
1600 * Assume REC or LS_ACC was lost.
1601 * The exchange manager will have aborted REC, so retry.
1603 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
1604 fsp->rport->port_id, error, fsp->recov_retry,
1605 FC_MAX_RECOV_RETRY);
1606 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1607 fc_fcp_rec(fsp);
1608 else
1609 fc_fcp_recovery(fsp, FC_ERROR);
1610 break;
1612 fc_fcp_unlock_pkt(fsp);
1613 out:
1614 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1618 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1619 * @fsp: The FCP pkt that needs to be aborted
1621 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1623 fsp->status_code = code;
1624 fsp->cdb_status = 0;
1625 fsp->io_status = 0;
1627 * if this fails then we let the scsi command timer fire and
1628 * scsi-ml escalate.
1630 fc_fcp_send_abort(fsp);
1634 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1635 * @fsp: The FCP packet the SRR is to be sent on
1636 * @r_ctl: The R_CTL field for the SRR request
1637 * This is called after receiving status but insufficient data, or
1638 * when expecting status but the request has timed out.
1640 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1642 struct fc_lport *lport = fsp->lp;
1643 struct fc_rport *rport;
1644 struct fc_rport_libfc_priv *rpriv;
1645 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1646 struct fc_seq *seq;
1647 struct fcp_srr *srr;
1648 struct fc_frame *fp;
1649 unsigned int rec_tov;
1651 rport = fsp->rport;
1652 rpriv = rport->dd_data;
1654 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1655 rpriv->rp_state != RPORT_ST_READY)
1656 goto retry; /* shouldn't happen */
1657 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1658 if (!fp)
1659 goto retry;
1661 srr = fc_frame_payload_get(fp, sizeof(*srr));
1662 memset(srr, 0, sizeof(*srr));
1663 srr->srr_op = ELS_SRR;
1664 srr->srr_ox_id = htons(ep->oxid);
1665 srr->srr_rx_id = htons(ep->rxid);
1666 srr->srr_r_ctl = r_ctl;
1667 srr->srr_rel_off = htonl(offset);
1669 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1670 rpriv->local_port->port_id, FC_TYPE_FCP,
1671 FC_FCTL_REQ, 0);
1673 rec_tov = get_fsp_rec_tov(fsp);
1674 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp,
1675 fc_fcp_pkt_destroy,
1676 fsp, jiffies_to_msecs(rec_tov));
1677 if (!seq)
1678 goto retry;
1680 fsp->recov_seq = seq;
1681 fsp->xfer_len = offset;
1682 fsp->xfer_contig_end = offset;
1683 fsp->state &= ~FC_SRB_RCV_STATUS;
1684 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1685 return;
1686 retry:
1687 fc_fcp_retry_cmd(fsp);
1691 * fc_fcp_srr_resp() - Handler for SRR response
1692 * @seq: The sequence the SRR is on
1693 * @fp: The SRR frame
1694 * @arg: The FCP packet the SRR is on
1696 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1698 struct fc_fcp_pkt *fsp = arg;
1699 struct fc_frame_header *fh;
1701 if (IS_ERR(fp)) {
1702 fc_fcp_srr_error(fsp, fp);
1703 return;
1706 if (fc_fcp_lock_pkt(fsp))
1707 goto out;
1709 fh = fc_frame_header_get(fp);
1711 * BUG? fc_fcp_srr_error calls exch_done which would release
1712 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1713 * then fc_exch_timeout would be sending an abort. The exch_done
1714 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1715 * an abort response though.
1717 if (fh->fh_type == FC_TYPE_BLS) {
1718 fc_fcp_unlock_pkt(fsp);
1719 return;
1722 switch (fc_frame_payload_op(fp)) {
1723 case ELS_LS_ACC:
1724 fsp->recov_retry = 0;
1725 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1726 break;
1727 case ELS_LS_RJT:
1728 default:
1729 fc_fcp_recovery(fsp, FC_ERROR);
1730 break;
1732 fc_fcp_unlock_pkt(fsp);
1733 out:
1734 fsp->lp->tt.exch_done(seq);
1735 fc_frame_free(fp);
1739 * fc_fcp_srr_error() - Handler for SRR errors
1740 * @fsp: The FCP packet that the SRR error is on
1741 * @fp: The SRR frame
1743 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1745 if (fc_fcp_lock_pkt(fsp))
1746 goto out;
1747 switch (PTR_ERR(fp)) {
1748 case -FC_EX_TIMEOUT:
1749 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1750 fc_fcp_rec(fsp);
1751 else
1752 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1753 break;
1754 case -FC_EX_CLOSED: /* e.g., link failure */
1755 /* fall through */
1756 default:
1757 fc_fcp_retry_cmd(fsp);
1758 break;
1760 fc_fcp_unlock_pkt(fsp);
1761 out:
1762 fsp->lp->tt.exch_done(fsp->recov_seq);
1766 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1767 * @lport: The local port to be checked
1769 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1771 /* lock ? */
1772 return (lport->state == LPORT_ST_READY) &&
1773 lport->link_up && !lport->qfull;
1777 * fc_queuecommand() - The queuecommand function of the SCSI template
1778 * @shost: The Scsi_Host that the command was issued to
1779 * @cmd: The scsi_cmnd to be executed
1781 * This is the i/o strategy routine, called by the SCSI layer.
1783 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1785 struct fc_lport *lport = shost_priv(shost);
1786 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1787 struct fc_fcp_pkt *fsp;
1788 struct fc_rport_libfc_priv *rpriv;
1789 int rval;
1790 int rc = 0;
1791 struct fcoe_dev_stats *stats;
1793 rval = fc_remote_port_chkready(rport);
1794 if (rval) {
1795 sc_cmd->result = rval;
1796 sc_cmd->scsi_done(sc_cmd);
1797 return 0;
1800 if (!*(struct fc_remote_port **)rport->dd_data) {
1802 * rport is transitioning from blocked/deleted to
1803 * online
1805 sc_cmd->result = DID_IMM_RETRY << 16;
1806 sc_cmd->scsi_done(sc_cmd);
1807 goto out;
1810 rpriv = rport->dd_data;
1812 if (!fc_fcp_lport_queue_ready(lport)) {
1813 if (lport->qfull)
1814 fc_fcp_can_queue_ramp_down(lport);
1815 rc = SCSI_MLQUEUE_HOST_BUSY;
1816 goto out;
1819 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1820 if (fsp == NULL) {
1821 rc = SCSI_MLQUEUE_HOST_BUSY;
1822 goto out;
1826 * build the libfc request pkt
1828 fsp->cmd = sc_cmd; /* save the cmd */
1829 fsp->rport = rport; /* set the remote port ptr */
1832 * set up the transfer length
1834 fsp->data_len = scsi_bufflen(sc_cmd);
1835 fsp->xfer_len = 0;
1838 * setup the data direction
1840 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1841 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1842 fsp->req_flags = FC_SRB_READ;
1843 stats->InputRequests++;
1844 stats->InputBytes += fsp->data_len;
1845 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1846 fsp->req_flags = FC_SRB_WRITE;
1847 stats->OutputRequests++;
1848 stats->OutputBytes += fsp->data_len;
1849 } else {
1850 fsp->req_flags = 0;
1851 stats->ControlRequests++;
1853 put_cpu();
1855 init_timer(&fsp->timer);
1856 fsp->timer.data = (unsigned long)fsp;
1859 * send it to the lower layer
1860 * if we get -1 return then put the request in the pending
1861 * queue.
1863 rval = fc_fcp_pkt_send(lport, fsp);
1864 if (rval != 0) {
1865 fsp->state = FC_SRB_FREE;
1866 fc_fcp_pkt_release(fsp);
1867 rc = SCSI_MLQUEUE_HOST_BUSY;
1869 out:
1870 return rc;
1872 EXPORT_SYMBOL(fc_queuecommand);
1875 * fc_io_compl() - Handle responses for completed commands
1876 * @fsp: The FCP packet that is complete
1878 * Translates fcp_pkt errors to a Linux SCSI errors.
1879 * The fcp packet lock must be held when calling.
1881 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1883 struct fc_fcp_internal *si;
1884 struct scsi_cmnd *sc_cmd;
1885 struct fc_lport *lport;
1886 unsigned long flags;
1888 /* release outstanding ddp context */
1889 fc_fcp_ddp_done(fsp);
1891 fsp->state |= FC_SRB_COMPL;
1892 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1893 spin_unlock_bh(&fsp->scsi_pkt_lock);
1894 del_timer_sync(&fsp->timer);
1895 spin_lock_bh(&fsp->scsi_pkt_lock);
1898 lport = fsp->lp;
1899 si = fc_get_scsi_internal(lport);
1902 * if can_queue ramp down is done then try can_queue ramp up
1903 * since commands are completing now.
1905 if (si->last_can_queue_ramp_down_time)
1906 fc_fcp_can_queue_ramp_up(lport);
1908 sc_cmd = fsp->cmd;
1909 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1910 switch (fsp->status_code) {
1911 case FC_COMPLETE:
1912 if (fsp->cdb_status == 0) {
1914 * good I/O status
1916 sc_cmd->result = DID_OK << 16;
1917 if (fsp->scsi_resid)
1918 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1919 } else {
1921 * transport level I/O was ok but scsi
1922 * has non zero status
1924 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1926 break;
1927 case FC_ERROR:
1928 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1929 "due to FC_ERROR\n");
1930 sc_cmd->result = DID_ERROR << 16;
1931 break;
1932 case FC_DATA_UNDRUN:
1933 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1935 * scsi status is good but transport level
1936 * underrun.
1938 if (fsp->state & FC_SRB_RCV_STATUS) {
1939 sc_cmd->result = DID_OK << 16;
1940 } else {
1941 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
1942 " due to FC_DATA_UNDRUN (trans)\n");
1943 sc_cmd->result = DID_ERROR << 16;
1945 } else {
1947 * scsi got underrun, this is an error
1949 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1950 "due to FC_DATA_UNDRUN (scsi)\n");
1951 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1952 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1954 break;
1955 case FC_DATA_OVRRUN:
1957 * overrun is an error
1959 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1960 "due to FC_DATA_OVRRUN\n");
1961 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1962 break;
1963 case FC_CMD_ABORTED:
1964 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1965 "due to FC_CMD_ABORTED\n");
1966 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1967 break;
1968 case FC_CMD_RESET:
1969 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
1970 "due to FC_CMD_RESET\n");
1971 sc_cmd->result = (DID_RESET << 16);
1972 break;
1973 case FC_HRD_ERROR:
1974 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
1975 "due to FC_HRD_ERROR\n");
1976 sc_cmd->result = (DID_NO_CONNECT << 16);
1977 break;
1978 case FC_CRC_ERROR:
1979 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
1980 "due to FC_CRC_ERROR\n");
1981 sc_cmd->result = (DID_PARITY << 16);
1982 break;
1983 case FC_TIMED_OUT:
1984 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
1985 "due to FC_TIMED_OUT\n");
1986 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1987 break;
1988 default:
1989 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1990 "due to unknown error\n");
1991 sc_cmd->result = (DID_ERROR << 16);
1992 break;
1995 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
1996 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
1998 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1999 list_del(&fsp->list);
2000 sc_cmd->SCp.ptr = NULL;
2001 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2002 sc_cmd->scsi_done(sc_cmd);
2004 /* release ref from initial allocation in queue command */
2005 fc_fcp_pkt_release(fsp);
2009 * fc_eh_abort() - Abort a command
2010 * @sc_cmd: The SCSI command to abort
2012 * From SCSI host template.
2013 * Send an ABTS to the target device and wait for the response.
2015 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2017 struct fc_fcp_pkt *fsp;
2018 struct fc_lport *lport;
2019 struct fc_fcp_internal *si;
2020 int rc = FAILED;
2021 unsigned long flags;
2023 lport = shost_priv(sc_cmd->device->host);
2024 if (lport->state != LPORT_ST_READY)
2025 return rc;
2026 else if (!lport->link_up)
2027 return rc;
2029 si = fc_get_scsi_internal(lport);
2030 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2031 fsp = CMD_SP(sc_cmd);
2032 if (!fsp) {
2033 /* command completed while scsi eh was setting up */
2034 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2035 return SUCCESS;
2037 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2038 fc_fcp_pkt_hold(fsp);
2039 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2041 if (fc_fcp_lock_pkt(fsp)) {
2042 /* completed while we were waiting for timer to be deleted */
2043 rc = SUCCESS;
2044 goto release_pkt;
2047 rc = fc_fcp_pkt_abort(fsp);
2048 fc_fcp_unlock_pkt(fsp);
2050 release_pkt:
2051 fc_fcp_pkt_release(fsp);
2052 return rc;
2054 EXPORT_SYMBOL(fc_eh_abort);
2057 * fc_eh_device_reset() - Reset a single LUN
2058 * @sc_cmd: The SCSI command which identifies the device whose
2059 * LUN is to be reset
2061 * Set from SCSI host template.
2063 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2065 struct fc_lport *lport;
2066 struct fc_fcp_pkt *fsp;
2067 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2068 int rc = FAILED;
2069 int rval;
2071 rval = fc_remote_port_chkready(rport);
2072 if (rval)
2073 goto out;
2075 lport = shost_priv(sc_cmd->device->host);
2077 if (lport->state != LPORT_ST_READY)
2078 return rc;
2080 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2082 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2083 if (fsp == NULL) {
2084 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2085 goto out;
2089 * Build the libfc request pkt. Do not set the scsi cmnd, because
2090 * the sc passed in is not setup for execution like when sent
2091 * through the queuecommand callout.
2093 fsp->rport = rport; /* set the remote port ptr */
2096 * flush outstanding commands
2098 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2099 fsp->state = FC_SRB_FREE;
2100 fc_fcp_pkt_release(fsp);
2102 out:
2103 return rc;
2105 EXPORT_SYMBOL(fc_eh_device_reset);
2108 * fc_eh_host_reset() - Reset a Scsi_Host.
2109 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2111 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2113 struct Scsi_Host *shost = sc_cmd->device->host;
2114 struct fc_lport *lport = shost_priv(shost);
2115 unsigned long wait_tmo;
2117 FC_SCSI_DBG(lport, "Resetting host\n");
2119 lport->tt.lport_reset(lport);
2120 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2121 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2122 wait_tmo))
2123 msleep(1000);
2125 if (fc_fcp_lport_queue_ready(lport)) {
2126 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2127 "on port (%6.6x)\n", lport->port_id);
2128 return SUCCESS;
2129 } else {
2130 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2131 "port (%6.6x) is not ready.\n",
2132 lport->port_id);
2133 return FAILED;
2136 EXPORT_SYMBOL(fc_eh_host_reset);
2139 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2140 * @sdev: The SCSI device that identifies the SCSI host
2142 * Configures queue depth based on host's cmd_per_len. If not set
2143 * then we use the libfc default.
2145 int fc_slave_alloc(struct scsi_device *sdev)
2147 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2149 if (!rport || fc_remote_port_chkready(rport))
2150 return -ENXIO;
2152 if (sdev->tagged_supported)
2153 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2154 else
2155 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2156 FC_FCP_DFLT_QUEUE_DEPTH);
2158 return 0;
2160 EXPORT_SYMBOL(fc_slave_alloc);
2163 * fc_change_queue_depth() - Change a device's queue depth
2164 * @sdev: The SCSI device whose queue depth is to change
2165 * @qdepth: The new queue depth
2166 * @reason: The resason for the change
2168 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2170 switch (reason) {
2171 case SCSI_QDEPTH_DEFAULT:
2172 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2173 break;
2174 case SCSI_QDEPTH_QFULL:
2175 scsi_track_queue_full(sdev, qdepth);
2176 break;
2177 case SCSI_QDEPTH_RAMP_UP:
2178 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2179 break;
2180 default:
2181 return -EOPNOTSUPP;
2183 return sdev->queue_depth;
2185 EXPORT_SYMBOL(fc_change_queue_depth);
2188 * fc_change_queue_type() - Change a device's queue type
2189 * @sdev: The SCSI device whose queue depth is to change
2190 * @tag_type: Identifier for queue type
2192 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2194 if (sdev->tagged_supported) {
2195 scsi_set_tag_type(sdev, tag_type);
2196 if (tag_type)
2197 scsi_activate_tcq(sdev, sdev->queue_depth);
2198 else
2199 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2200 } else
2201 tag_type = 0;
2203 return tag_type;
2205 EXPORT_SYMBOL(fc_change_queue_type);
2208 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2209 * @lport: The local port that no longer needs the FCP layer
2211 void fc_fcp_destroy(struct fc_lport *lport)
2213 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2215 if (!list_empty(&si->scsi_pkt_queue))
2216 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2217 "port (%6.6x)\n", lport->port_id);
2219 mempool_destroy(si->scsi_pkt_pool);
2220 kfree(si);
2221 lport->scsi_priv = NULL;
2223 EXPORT_SYMBOL(fc_fcp_destroy);
2225 int fc_setup_fcp(void)
2227 int rc = 0;
2229 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2230 sizeof(struct fc_fcp_pkt),
2231 0, SLAB_HWCACHE_ALIGN, NULL);
2232 if (!scsi_pkt_cachep) {
2233 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2234 "module load failed!");
2235 rc = -ENOMEM;
2238 return rc;
2241 void fc_destroy_fcp(void)
2243 if (scsi_pkt_cachep)
2244 kmem_cache_destroy(scsi_pkt_cachep);
2248 * fc_fcp_init() - Initialize the FCP layer for a local port
2249 * @lport: The local port to initialize the exchange layer for
2251 int fc_fcp_init(struct fc_lport *lport)
2253 int rc;
2254 struct fc_fcp_internal *si;
2256 if (!lport->tt.fcp_cmd_send)
2257 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2259 if (!lport->tt.fcp_cleanup)
2260 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2262 if (!lport->tt.fcp_abort_io)
2263 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2265 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2266 if (!si)
2267 return -ENOMEM;
2268 lport->scsi_priv = si;
2269 si->max_can_queue = lport->host->can_queue;
2270 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2271 spin_lock_init(&si->scsi_queue_lock);
2273 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2274 if (!si->scsi_pkt_pool) {
2275 rc = -ENOMEM;
2276 goto free_internal;
2278 return 0;
2280 free_internal:
2281 kfree(si);
2282 return rc;
2284 EXPORT_SYMBOL(fc_fcp_init);