xen/blkback: Use the DRV_PFX in the pr_.. macros.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / libfc / fc_fcp.c
blob5b799a37ad0991dca76bf05b643ed5ef44cad341
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)
60 /* constant added to e_d_tov timeout to get rec_tov value */
61 #define REC_TOV_CONST 1
64 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
66 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
67 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
68 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
69 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
70 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
72 /**
73 * struct fc_fcp_internal - FCP layer internal data
74 * @scsi_pkt_pool: Memory pool to draw FCP packets from
75 * @scsi_queue_lock: Protects the scsi_pkt_queue
76 * @scsi_pkt_queue: Current FCP packets
77 * @last_can_queue_ramp_down_time: ramp down time
78 * @last_can_queue_ramp_up_time: ramp up time
79 * @max_can_queue: max can_queue size
81 struct fc_fcp_internal {
82 mempool_t *scsi_pkt_pool;
83 spinlock_t scsi_queue_lock;
84 struct list_head scsi_pkt_queue;
85 unsigned long last_can_queue_ramp_down_time;
86 unsigned long last_can_queue_ramp_up_time;
87 int max_can_queue;
90 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
93 * function prototypes
94 * FC scsi I/O related functions
96 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
97 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
98 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
99 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
100 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
101 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
102 static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
103 static void fc_fcp_timeout(unsigned long);
104 static void fc_fcp_rec(struct fc_fcp_pkt *);
105 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
106 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
107 static void fc_io_compl(struct fc_fcp_pkt *);
109 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
110 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
111 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
114 * command status codes
116 #define FC_COMPLETE 0
117 #define FC_CMD_ABORTED 1
118 #define FC_CMD_RESET 2
119 #define FC_CMD_PLOGO 3
120 #define FC_SNS_RCV 4
121 #define FC_TRANS_ERR 5
122 #define FC_DATA_OVRRUN 6
123 #define FC_DATA_UNDRUN 7
124 #define FC_ERROR 8
125 #define FC_HRD_ERROR 9
126 #define FC_CRC_ERROR 10
127 #define FC_TIMED_OUT 11
130 * Error recovery timeout values.
132 #define FC_SCSI_TM_TOV (10 * HZ)
133 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
134 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
136 #define FC_MAX_ERROR_CNT 5
137 #define FC_MAX_RECOV_RETRY 3
139 #define FC_FCP_DFLT_QUEUE_DEPTH 32
142 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
143 * @lport: The local port that the FCP packet is for
144 * @gfp: GFP flags for allocation
146 * Return value: fcp_pkt structure or null on allocation failure.
147 * Context: Can be called from process context, no lock is required.
149 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
151 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
152 struct fc_fcp_pkt *fsp;
154 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
155 if (fsp) {
156 memset(fsp, 0, sizeof(*fsp));
157 fsp->lp = lport;
158 fsp->xfer_ddp = FC_XID_UNKNOWN;
159 atomic_set(&fsp->ref_cnt, 1);
160 init_timer(&fsp->timer);
161 INIT_LIST_HEAD(&fsp->list);
162 spin_lock_init(&fsp->scsi_pkt_lock);
164 return fsp;
168 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
169 * @fsp: The FCP packet to be released
171 * Context: Can be called from process or interrupt context,
172 * no lock is required.
174 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
176 if (atomic_dec_and_test(&fsp->ref_cnt)) {
177 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
179 mempool_free(fsp, si->scsi_pkt_pool);
184 * fc_fcp_pkt_hold() - Hold a fcp_pkt
185 * @fsp: The FCP packet to be held
187 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
189 atomic_inc(&fsp->ref_cnt);
193 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
194 * @seq: The sequence that the FCP packet is on (required by destructor API)
195 * @fsp: The FCP packet to be released
197 * This routine is called by a destructor callback in the exch_seq_send()
198 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
199 * argument even though it is not used by this routine.
201 * Context: No locking required.
203 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
205 fc_fcp_pkt_release(fsp);
209 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
210 * @fsp: The FCP packet to be locked and incremented
212 * We should only return error if we return a command to SCSI-ml before
213 * getting a response. This can happen in cases where we send a abort, but
214 * do not wait for the response and the abort and command can be passing
215 * each other on the wire/network-layer.
217 * Note: this function locks the packet and gets a reference to allow
218 * callers to call the completion function while the lock is held and
219 * not have to worry about the packets refcount.
221 * TODO: Maybe we should just have callers grab/release the lock and
222 * have a function that they call to verify the fsp and grab a ref if
223 * needed.
225 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
227 spin_lock_bh(&fsp->scsi_pkt_lock);
228 if (fsp->state & FC_SRB_COMPL) {
229 spin_unlock_bh(&fsp->scsi_pkt_lock);
230 return -EPERM;
233 fc_fcp_pkt_hold(fsp);
234 return 0;
238 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
239 * reference count
240 * @fsp: The FCP packet to be unlocked and decremented
242 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
244 spin_unlock_bh(&fsp->scsi_pkt_lock);
245 fc_fcp_pkt_release(fsp);
249 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
250 * @fsp: The FCP packet to start a timer for
251 * @delay: The timeout period for the timer
253 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
255 if (!(fsp->state & FC_SRB_COMPL))
256 mod_timer(&fsp->timer, jiffies + delay);
260 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
261 * fcp_pkt
262 * @fsp: The FCP packet to abort exchanges on
264 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
266 if (!fsp->seq_ptr)
267 return -EINVAL;
269 fsp->state |= FC_SRB_ABORT_PENDING;
270 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
274 * fc_fcp_retry_cmd() - Retry a fcp_pkt
275 * @fsp: The FCP packet to be retried
277 * Sets the status code to be FC_ERROR and then calls
278 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
279 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
280 * The SCSI-ml will retry the command.
282 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
284 if (fsp->seq_ptr) {
285 fsp->lp->tt.exch_done(fsp->seq_ptr);
286 fsp->seq_ptr = NULL;
289 fsp->state &= ~FC_SRB_ABORT_PENDING;
290 fsp->io_status = 0;
291 fsp->status_code = FC_ERROR;
292 fc_fcp_complete_locked(fsp);
296 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
297 * @fsp: The FCP packet that will manage the DDP frames
298 * @xid: The XID that will be used for the DDP exchange
300 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
302 struct fc_lport *lport;
304 lport = fsp->lp;
305 if ((fsp->req_flags & FC_SRB_READ) &&
306 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
307 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
308 scsi_sg_count(fsp->cmd)))
309 fsp->xfer_ddp = xid;
314 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
315 * DDP related resources for a fcp_pkt
316 * @fsp: The FCP packet that DDP had been used on
318 static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
320 struct fc_lport *lport;
322 if (!fsp)
323 return;
325 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
326 return;
328 lport = fsp->lp;
329 if (lport->tt.ddp_done) {
330 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
331 fsp->xfer_ddp = FC_XID_UNKNOWN;
336 * fc_fcp_can_queue_ramp_up() - increases can_queue
337 * @lport: lport to ramp up can_queue
339 * Locking notes: Called with Scsi_Host lock held
341 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
343 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
344 int can_queue;
346 if (si->last_can_queue_ramp_up_time &&
347 (time_before(jiffies, si->last_can_queue_ramp_up_time +
348 FC_CAN_QUEUE_PERIOD)))
349 return;
351 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
352 FC_CAN_QUEUE_PERIOD))
353 return;
355 si->last_can_queue_ramp_up_time = jiffies;
357 can_queue = lport->host->can_queue << 1;
358 if (can_queue >= si->max_can_queue) {
359 can_queue = si->max_can_queue;
360 si->last_can_queue_ramp_down_time = 0;
362 lport->host->can_queue = can_queue;
363 shost_printk(KERN_ERR, lport->host, "libfc: increased "
364 "can_queue to %d.\n", can_queue);
368 * fc_fcp_can_queue_ramp_down() - reduces can_queue
369 * @lport: lport to reduce can_queue
371 * If we are getting memory allocation failures, then we may
372 * be trying to execute too many commands. We let the running
373 * commands complete or timeout, then try again with a reduced
374 * can_queue. Eventually we will hit the point where we run
375 * on all reserved structs.
377 * Locking notes: Called with Scsi_Host lock held
379 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
381 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
382 int can_queue;
384 if (si->last_can_queue_ramp_down_time &&
385 (time_before(jiffies, si->last_can_queue_ramp_down_time +
386 FC_CAN_QUEUE_PERIOD)))
387 return;
389 si->last_can_queue_ramp_down_time = jiffies;
391 can_queue = lport->host->can_queue;
392 can_queue >>= 1;
393 if (!can_queue)
394 can_queue = 1;
395 lport->host->can_queue = can_queue;
396 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
397 "Reducing can_queue to %d.\n", can_queue);
401 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
402 * @lport: fc lport struct
403 * @len: payload length
405 * Allocates fc_frame structure and buffer but if fails to allocate
406 * then reduce can_queue.
408 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
409 size_t len)
411 struct fc_frame *fp;
412 unsigned long flags;
414 fp = fc_frame_alloc(lport, len);
415 if (likely(fp))
416 return fp;
418 /* error case */
419 spin_lock_irqsave(lport->host->host_lock, flags);
420 fc_fcp_can_queue_ramp_down(lport);
421 spin_unlock_irqrestore(lport->host->host_lock, flags);
422 return NULL;
426 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
427 * @fsp: The FCP packet the data is on
428 * @fp: The data frame
430 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
432 struct scsi_cmnd *sc = fsp->cmd;
433 struct fc_lport *lport = fsp->lp;
434 struct fcoe_dev_stats *stats;
435 struct fc_frame_header *fh;
436 size_t start_offset;
437 size_t offset;
438 u32 crc;
439 u32 copy_len = 0;
440 size_t len;
441 void *buf;
442 struct scatterlist *sg;
443 u32 nents;
444 u8 host_bcode = FC_COMPLETE;
446 fh = fc_frame_header_get(fp);
447 offset = ntohl(fh->fh_parm_offset);
448 start_offset = offset;
449 len = fr_len(fp) - sizeof(*fh);
450 buf = fc_frame_payload_get(fp, 0);
453 * if this I/O is ddped then clear it and initiate recovery since data
454 * frames are expected to be placed directly in that case.
456 * Indicate error to scsi-ml because something went wrong with the
457 * ddp handling to get us here.
459 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
460 fc_fcp_ddp_done(fsp);
461 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
462 host_bcode = FC_ERROR;
463 goto err;
465 if (offset + len > fsp->data_len) {
466 /* this should never happen */
467 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
468 fc_frame_crc_check(fp))
469 goto crc_err;
470 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
471 "data_len %x\n", len, offset, fsp->data_len);
473 /* Data is corrupted indicate scsi-ml should retry */
474 host_bcode = FC_DATA_OVRRUN;
475 goto err;
477 if (offset != fsp->xfer_len)
478 fsp->state |= FC_SRB_DISCONTIG;
480 sg = scsi_sglist(sc);
481 nents = scsi_sg_count(sc);
483 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
484 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
485 &offset, KM_SOFTIRQ0, NULL);
486 } else {
487 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
488 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
489 &offset, KM_SOFTIRQ0, &crc);
490 buf = fc_frame_payload_get(fp, 0);
491 if (len % 4)
492 crc = crc32(crc, buf + len, 4 - (len % 4));
494 if (~crc != le32_to_cpu(fr_crc(fp))) {
495 crc_err:
496 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
497 stats->ErrorFrames++;
498 /* per cpu count, not total count, but OK for limit */
499 if (stats->InvalidCRCCount++ < 5)
500 printk(KERN_WARNING "libfc: CRC error on data "
501 "frame for port (%6.6x)\n",
502 lport->port_id);
503 put_cpu();
505 * Assume the frame is total garbage.
506 * We may have copied it over the good part
507 * of the buffer.
508 * If so, we need to retry the entire operation.
509 * Otherwise, ignore it.
511 if (fsp->state & FC_SRB_DISCONTIG) {
512 host_bcode = FC_CRC_ERROR;
513 goto err;
515 return;
519 if (fsp->xfer_contig_end == start_offset)
520 fsp->xfer_contig_end += copy_len;
521 fsp->xfer_len += copy_len;
524 * In the very rare event that this data arrived after the response
525 * and completes the transfer, call the completion handler.
527 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
528 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
529 fc_fcp_complete_locked(fsp);
530 return;
531 err:
532 fc_fcp_recovery(fsp, host_bcode);
536 * fc_fcp_send_data() - Send SCSI data to a target
537 * @fsp: The FCP packet the data is on
538 * @sp: The sequence the data is to be sent on
539 * @offset: The starting offset for this data request
540 * @seq_blen: The burst length for this data request
542 * Called after receiving a Transfer Ready data descriptor.
543 * If the LLD is capable of sequence offload then send down the
544 * seq_blen amount of data in single frame, otherwise send
545 * multiple frames of the maximum frame payload supported by
546 * the target port.
548 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
549 size_t offset, size_t seq_blen)
551 struct fc_exch *ep;
552 struct scsi_cmnd *sc;
553 struct scatterlist *sg;
554 struct fc_frame *fp = NULL;
555 struct fc_lport *lport = fsp->lp;
556 struct page *page;
557 size_t remaining;
558 size_t t_blen;
559 size_t tlen;
560 size_t sg_bytes;
561 size_t frame_offset, fh_parm_offset;
562 size_t off;
563 int error;
564 void *data = NULL;
565 void *page_addr;
566 int using_sg = lport->sg_supp;
567 u32 f_ctl;
569 WARN_ON(seq_blen <= 0);
570 if (unlikely(offset + seq_blen > fsp->data_len)) {
571 /* this should never happen */
572 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
573 "offset %zx\n", seq_blen, offset);
574 fc_fcp_send_abort(fsp);
575 return 0;
576 } else if (offset != fsp->xfer_len) {
577 /* Out of Order Data Request - no problem, but unexpected. */
578 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
579 "seq_blen %zx offset %zx\n", seq_blen, offset);
583 * if LLD is capable of seq_offload then set transport
584 * burst length (t_blen) to seq_blen, otherwise set t_blen
585 * to max FC frame payload previously set in fsp->max_payload.
587 t_blen = fsp->max_payload;
588 if (lport->seq_offload) {
589 t_blen = min(seq_blen, (size_t)lport->lso_max);
590 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
591 fsp, seq_blen, lport->lso_max, t_blen);
594 if (t_blen > 512)
595 t_blen &= ~(512 - 1); /* round down to block size */
596 sc = fsp->cmd;
598 remaining = seq_blen;
599 fh_parm_offset = frame_offset = offset;
600 tlen = 0;
601 seq = lport->tt.seq_start_next(seq);
602 f_ctl = FC_FC_REL_OFF;
603 WARN_ON(!seq);
605 sg = scsi_sglist(sc);
607 while (remaining > 0 && sg) {
608 if (offset >= sg->length) {
609 offset -= sg->length;
610 sg = sg_next(sg);
611 continue;
613 if (!fp) {
614 tlen = min(t_blen, remaining);
617 * TODO. Temporary workaround. fc_seq_send() can't
618 * handle odd lengths in non-linear skbs.
619 * This will be the final fragment only.
621 if (tlen % 4)
622 using_sg = 0;
623 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
624 if (!fp)
625 return -ENOMEM;
627 data = fc_frame_header_get(fp) + 1;
628 fh_parm_offset = frame_offset;
629 fr_max_payload(fp) = fsp->max_payload;
632 off = offset + sg->offset;
633 sg_bytes = min(tlen, sg->length - offset);
634 sg_bytes = min(sg_bytes,
635 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
636 page = sg_page(sg) + (off >> PAGE_SHIFT);
637 if (using_sg) {
638 get_page(page);
639 skb_fill_page_desc(fp_skb(fp),
640 skb_shinfo(fp_skb(fp))->nr_frags,
641 page, off & ~PAGE_MASK, sg_bytes);
642 fp_skb(fp)->data_len += sg_bytes;
643 fr_len(fp) += sg_bytes;
644 fp_skb(fp)->truesize += PAGE_SIZE;
645 } else {
647 * The scatterlist item may be bigger than PAGE_SIZE,
648 * but we must not cross pages inside the kmap.
650 page_addr = kmap_atomic(page, KM_SOFTIRQ0);
651 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
652 sg_bytes);
653 kunmap_atomic(page_addr, KM_SOFTIRQ0);
654 data += sg_bytes;
656 offset += sg_bytes;
657 frame_offset += sg_bytes;
658 tlen -= sg_bytes;
659 remaining -= sg_bytes;
661 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
662 (tlen))
663 continue;
666 * Send sequence with transfer sequence initiative in case
667 * this is last FCP frame of the sequence.
669 if (remaining == 0)
670 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
672 ep = fc_seq_exch(seq);
673 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
674 FC_TYPE_FCP, f_ctl, fh_parm_offset);
677 * send fragment using for a sequence.
679 error = lport->tt.seq_send(lport, seq, fp);
680 if (error) {
681 WARN_ON(1); /* send error should be rare */
682 fc_fcp_retry_cmd(fsp);
683 return 0;
685 fp = NULL;
687 fsp->xfer_len += seq_blen; /* premature count? */
688 return 0;
692 * fc_fcp_abts_resp() - Send an ABTS response
693 * @fsp: The FCP packet that is being aborted
694 * @fp: The response frame
696 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
698 int ba_done = 1;
699 struct fc_ba_rjt *brp;
700 struct fc_frame_header *fh;
702 fh = fc_frame_header_get(fp);
703 switch (fh->fh_r_ctl) {
704 case FC_RCTL_BA_ACC:
705 break;
706 case FC_RCTL_BA_RJT:
707 brp = fc_frame_payload_get(fp, sizeof(*brp));
708 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
709 break;
710 /* fall thru */
711 default:
713 * we will let the command timeout
714 * and scsi-ml recover in this case,
715 * therefore cleared the ba_done flag.
717 ba_done = 0;
720 if (ba_done) {
721 fsp->state |= FC_SRB_ABORTED;
722 fsp->state &= ~FC_SRB_ABORT_PENDING;
724 if (fsp->wait_for_comp)
725 complete(&fsp->tm_done);
726 else
727 fc_fcp_complete_locked(fsp);
732 * fc_fcp_recv() - Reveive an FCP frame
733 * @seq: The sequence the frame is on
734 * @fp: The received frame
735 * @arg: The related FCP packet
737 * Context: Called from Soft IRQ context. Can not be called
738 * holding the FCP packet list lock.
740 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
742 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
743 struct fc_lport *lport = fsp->lp;
744 struct fc_frame_header *fh;
745 struct fcp_txrdy *dd;
746 u8 r_ctl;
747 int rc = 0;
749 if (IS_ERR(fp)) {
750 fc_fcp_error(fsp, fp);
751 return;
754 fh = fc_frame_header_get(fp);
755 r_ctl = fh->fh_r_ctl;
757 if (lport->state != LPORT_ST_READY)
758 goto out;
759 if (fc_fcp_lock_pkt(fsp))
760 goto out;
761 fsp->last_pkt_time = jiffies;
763 if (fh->fh_type == FC_TYPE_BLS) {
764 fc_fcp_abts_resp(fsp, fp);
765 goto unlock;
768 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
769 goto unlock;
771 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
773 * received XFER RDY from the target
774 * need to send data to the target
776 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
777 dd = fc_frame_payload_get(fp, sizeof(*dd));
778 WARN_ON(!dd);
780 rc = fc_fcp_send_data(fsp, seq,
781 (size_t) ntohl(dd->ft_data_ro),
782 (size_t) ntohl(dd->ft_burst_len));
783 if (!rc)
784 seq->rec_data = fsp->xfer_len;
785 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
787 * received a DATA frame
788 * next we will copy the data to the system buffer
790 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
791 fc_fcp_recv_data(fsp, fp);
792 seq->rec_data = fsp->xfer_contig_end;
793 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
794 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
796 fc_fcp_resp(fsp, fp);
797 } else {
798 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
800 unlock:
801 fc_fcp_unlock_pkt(fsp);
802 out:
803 fc_frame_free(fp);
807 * fc_fcp_resp() - Handler for FCP responses
808 * @fsp: The FCP packet the response is for
809 * @fp: The response frame
811 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
813 struct fc_frame_header *fh;
814 struct fcp_resp *fc_rp;
815 struct fcp_resp_ext *rp_ex;
816 struct fcp_resp_rsp_info *fc_rp_info;
817 u32 plen;
818 u32 expected_len;
819 u32 respl = 0;
820 u32 snsl = 0;
821 u8 flags = 0;
823 plen = fr_len(fp);
824 fh = (struct fc_frame_header *)fr_hdr(fp);
825 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
826 goto len_err;
827 plen -= sizeof(*fh);
828 fc_rp = (struct fcp_resp *)(fh + 1);
829 fsp->cdb_status = fc_rp->fr_status;
830 flags = fc_rp->fr_flags;
831 fsp->scsi_comp_flags = flags;
832 expected_len = fsp->data_len;
834 /* if ddp, update xfer len */
835 fc_fcp_ddp_done(fsp);
837 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
838 rp_ex = (void *)(fc_rp + 1);
839 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
840 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
841 goto len_err;
842 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
843 if (flags & FCP_RSP_LEN_VAL) {
844 respl = ntohl(rp_ex->fr_rsp_len);
845 if (respl != sizeof(*fc_rp_info))
846 goto len_err;
847 if (fsp->wait_for_comp) {
848 /* Abuse cdb_status for rsp code */
849 fsp->cdb_status = fc_rp_info->rsp_code;
850 complete(&fsp->tm_done);
852 * tmfs will not have any scsi cmd so
853 * exit here
855 return;
858 if (flags & FCP_SNS_LEN_VAL) {
859 snsl = ntohl(rp_ex->fr_sns_len);
860 if (snsl > SCSI_SENSE_BUFFERSIZE)
861 snsl = SCSI_SENSE_BUFFERSIZE;
862 memcpy(fsp->cmd->sense_buffer,
863 (char *)fc_rp_info + respl, snsl);
866 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
867 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
868 goto len_err;
869 if (flags & FCP_RESID_UNDER) {
870 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
872 * The cmnd->underflow is the minimum number of
873 * bytes that must be transferred for this
874 * command. Provided a sense condition is not
875 * present, make sure the actual amount
876 * transferred is at least the underflow value
877 * or fail.
879 if (!(flags & FCP_SNS_LEN_VAL) &&
880 (fc_rp->fr_status == 0) &&
881 (scsi_bufflen(fsp->cmd) -
882 fsp->scsi_resid) < fsp->cmd->underflow)
883 goto err;
884 expected_len -= fsp->scsi_resid;
885 } else {
886 fsp->status_code = FC_ERROR;
890 fsp->state |= FC_SRB_RCV_STATUS;
893 * Check for missing or extra data frames.
895 if (unlikely(fsp->xfer_len != expected_len)) {
896 if (fsp->xfer_len < expected_len) {
898 * Some data may be queued locally,
899 * Wait a at least one jiffy to see if it is delivered.
900 * If this expires without data, we may do SRR.
902 fc_fcp_timer_set(fsp, 2);
903 return;
905 fsp->status_code = FC_DATA_OVRRUN;
906 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
907 "len %x, data len %x\n",
908 fsp->rport->port_id,
909 fsp->xfer_len, expected_len, fsp->data_len);
911 fc_fcp_complete_locked(fsp);
912 return;
914 len_err:
915 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
916 "snsl %u\n", flags, fr_len(fp), respl, snsl);
917 err:
918 fsp->status_code = FC_ERROR;
919 fc_fcp_complete_locked(fsp);
923 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
924 * fcp_pkt lock held
925 * @fsp: The FCP packet to be completed
927 * This function may sleep if a timer is pending. The packet lock must be
928 * held, and the host lock must not be held.
930 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
932 struct fc_lport *lport = fsp->lp;
933 struct fc_seq *seq;
934 struct fc_exch *ep;
935 u32 f_ctl;
937 if (fsp->state & FC_SRB_ABORT_PENDING)
938 return;
940 if (fsp->state & FC_SRB_ABORTED) {
941 if (!fsp->status_code)
942 fsp->status_code = FC_CMD_ABORTED;
943 } else {
945 * Test for transport underrun, independent of response
946 * underrun status.
948 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
949 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
950 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
951 fsp->status_code = FC_DATA_UNDRUN;
952 fsp->io_status = 0;
956 seq = fsp->seq_ptr;
957 if (seq) {
958 fsp->seq_ptr = NULL;
959 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
960 struct fc_frame *conf_frame;
961 struct fc_seq *csp;
963 csp = lport->tt.seq_start_next(seq);
964 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
965 if (conf_frame) {
966 f_ctl = FC_FC_SEQ_INIT;
967 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
968 ep = fc_seq_exch(seq);
969 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
970 ep->did, ep->sid,
971 FC_TYPE_FCP, f_ctl, 0);
972 lport->tt.seq_send(lport, csp, conf_frame);
975 lport->tt.exch_done(seq);
978 * Some resets driven by SCSI are not I/Os and do not have
979 * SCSI commands associated with the requests. We should not
980 * call I/O completion if we do not have a SCSI command.
982 if (fsp->cmd)
983 fc_io_compl(fsp);
987 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
988 * @fsp: The FCP packet whose exchanges should be canceled
989 * @error: The reason for the cancellation
991 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
993 struct fc_lport *lport = fsp->lp;
995 if (fsp->seq_ptr) {
996 lport->tt.exch_done(fsp->seq_ptr);
997 fsp->seq_ptr = NULL;
999 fsp->status_code = error;
1003 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1004 * @lport: The local port whose exchanges should be canceled
1005 * @id: The target's ID
1006 * @lun: The LUN
1007 * @error: The reason for cancellation
1009 * If lun or id is -1, they are ignored.
1011 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1012 unsigned int lun, int error)
1014 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1015 struct fc_fcp_pkt *fsp;
1016 struct scsi_cmnd *sc_cmd;
1017 unsigned long flags;
1019 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1020 restart:
1021 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1022 sc_cmd = fsp->cmd;
1023 if (id != -1 && scmd_id(sc_cmd) != id)
1024 continue;
1026 if (lun != -1 && sc_cmd->device->lun != lun)
1027 continue;
1029 fc_fcp_pkt_hold(fsp);
1030 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1032 if (!fc_fcp_lock_pkt(fsp)) {
1033 fc_fcp_cleanup_cmd(fsp, error);
1034 fc_io_compl(fsp);
1035 fc_fcp_unlock_pkt(fsp);
1038 fc_fcp_pkt_release(fsp);
1039 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1041 * while we dropped the lock multiple pkts could
1042 * have been released, so we have to start over.
1044 goto restart;
1046 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1050 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1051 * @lport: The local port whose exchanges are to be aborted
1053 static void fc_fcp_abort_io(struct fc_lport *lport)
1055 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1059 * fc_fcp_pkt_send() - Send a fcp_pkt
1060 * @lport: The local port to send the FCP packet on
1061 * @fsp: The FCP packet to send
1063 * Return: Zero for success and -1 for failure
1064 * Locks: Called without locks held
1066 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1068 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1069 unsigned long flags;
1070 int rc;
1072 fsp->cmd->SCp.ptr = (char *)fsp;
1073 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1074 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1076 int_to_scsilun(fsp->cmd->device->lun,
1077 (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1078 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1080 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1081 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1082 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1083 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1084 if (unlikely(rc)) {
1085 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1086 list_del(&fsp->list);
1087 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1090 return rc;
1094 * get_fsp_rec_tov() - Helper function to get REC_TOV
1095 * @fsp: the FCP packet
1097 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
1099 struct fc_rport *rport;
1100 struct fc_rport_libfc_priv *rpriv;
1102 rport = fsp->rport;
1103 rpriv = rport->dd_data;
1105 return rpriv->e_d_tov + REC_TOV_CONST;
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;
1125 unsigned int rec_tov;
1127 if (fc_fcp_lock_pkt(fsp))
1128 return 0;
1130 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1131 if (!fp) {
1132 rc = -1;
1133 goto unlock;
1136 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1137 fr_fsp(fp) = fsp;
1138 rport = fsp->rport;
1139 fsp->max_payload = rport->maxframe_size;
1140 rpriv = rport->dd_data;
1142 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1143 rpriv->local_port->port_id, FC_TYPE_FCP,
1144 FC_FCTL_REQ, 0);
1146 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1147 fsp, 0);
1148 if (!seq) {
1149 rc = -1;
1150 goto unlock;
1152 fsp->last_pkt_time = jiffies;
1153 fsp->seq_ptr = seq;
1154 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1156 rec_tov = get_fsp_rec_tov(fsp);
1158 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1160 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1161 fc_fcp_timer_set(fsp, rec_tov);
1163 unlock:
1164 fc_fcp_unlock_pkt(fsp);
1165 return rc;
1169 * fc_fcp_error() - Handler for FCP layer errors
1170 * @fsp: The FCP packet the error is on
1171 * @fp: The frame that has errored
1173 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1175 int error = PTR_ERR(fp);
1177 if (fc_fcp_lock_pkt(fsp))
1178 return;
1180 if (error == -FC_EX_CLOSED) {
1181 fc_fcp_retry_cmd(fsp);
1182 goto unlock;
1186 * clear abort pending, because the lower layer
1187 * decided to force completion.
1189 fsp->state &= ~FC_SRB_ABORT_PENDING;
1190 fsp->status_code = FC_CMD_PLOGO;
1191 fc_fcp_complete_locked(fsp);
1192 unlock:
1193 fc_fcp_unlock_pkt(fsp);
1197 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1198 * @fsp: The FCP packet to abort on
1200 * Called to send an abort and then wait for abort completion
1202 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1204 int rc = FAILED;
1205 unsigned long ticks_left;
1207 if (fc_fcp_send_abort(fsp))
1208 return FAILED;
1210 init_completion(&fsp->tm_done);
1211 fsp->wait_for_comp = 1;
1213 spin_unlock_bh(&fsp->scsi_pkt_lock);
1214 ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1215 FC_SCSI_TM_TOV);
1216 spin_lock_bh(&fsp->scsi_pkt_lock);
1217 fsp->wait_for_comp = 0;
1219 if (!ticks_left) {
1220 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1221 } else if (fsp->state & FC_SRB_ABORTED) {
1222 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1223 rc = SUCCESS;
1224 fc_fcp_complete_locked(fsp);
1227 return rc;
1231 * fc_lun_reset_send() - Send LUN reset command
1232 * @data: The FCP packet that identifies the LUN to be reset
1234 static void fc_lun_reset_send(unsigned long data)
1236 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1237 struct fc_lport *lport = fsp->lp;
1238 unsigned int rec_tov;
1240 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1241 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1242 return;
1243 if (fc_fcp_lock_pkt(fsp))
1244 return;
1245 rec_tov = get_fsp_rec_tov(fsp);
1246 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1247 fc_fcp_timer_set(fsp, rec_tov);
1248 fc_fcp_unlock_pkt(fsp);
1253 * fc_lun_reset() - Send a LUN RESET command to a device
1254 * and wait for the reply
1255 * @lport: The local port to sent the command on
1256 * @fsp: The FCP packet that identifies the LUN to be reset
1257 * @id: The SCSI command ID
1258 * @lun: The LUN ID to be reset
1260 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1261 unsigned int id, unsigned int lun)
1263 int rc;
1265 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1266 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1267 int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
1269 fsp->wait_for_comp = 1;
1270 init_completion(&fsp->tm_done);
1272 fc_lun_reset_send((unsigned long)fsp);
1275 * wait for completion of reset
1276 * after that make sure all commands are terminated
1278 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1280 spin_lock_bh(&fsp->scsi_pkt_lock);
1281 fsp->state |= FC_SRB_COMPL;
1282 spin_unlock_bh(&fsp->scsi_pkt_lock);
1284 del_timer_sync(&fsp->timer);
1286 spin_lock_bh(&fsp->scsi_pkt_lock);
1287 if (fsp->seq_ptr) {
1288 lport->tt.exch_done(fsp->seq_ptr);
1289 fsp->seq_ptr = NULL;
1291 fsp->wait_for_comp = 0;
1292 spin_unlock_bh(&fsp->scsi_pkt_lock);
1294 if (!rc) {
1295 FC_SCSI_DBG(lport, "lun reset failed\n");
1296 return FAILED;
1299 /* cdb_status holds the tmf's rsp code */
1300 if (fsp->cdb_status != FCP_TMF_CMPL)
1301 return FAILED;
1303 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1304 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1305 return SUCCESS;
1309 * fc_tm_done() - Task Management response handler
1310 * @seq: The sequence that the response is on
1311 * @fp: The response frame
1312 * @arg: The FCP packet the response is for
1314 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1316 struct fc_fcp_pkt *fsp = arg;
1317 struct fc_frame_header *fh;
1319 if (IS_ERR(fp)) {
1321 * If there is an error just let it timeout or wait
1322 * for TMF to be aborted if it timedout.
1324 * scsi-eh will escalate for when either happens.
1326 return;
1329 if (fc_fcp_lock_pkt(fsp))
1330 goto out;
1333 * raced with eh timeout handler.
1335 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1336 goto out_unlock;
1338 fh = fc_frame_header_get(fp);
1339 if (fh->fh_type != FC_TYPE_BLS)
1340 fc_fcp_resp(fsp, fp);
1341 fsp->seq_ptr = NULL;
1342 fsp->lp->tt.exch_done(seq);
1343 out_unlock:
1344 fc_fcp_unlock_pkt(fsp);
1345 out:
1346 fc_frame_free(fp);
1350 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1351 * @lport: The local port to be cleaned up
1353 static void fc_fcp_cleanup(struct fc_lport *lport)
1355 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1359 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1360 * @data: The FCP packet that has timed out
1362 * If REC is supported then just issue it and return. The REC exchange will
1363 * complete or time out and recovery can continue at that point. Otherwise,
1364 * if the response has been received without all the data it has been
1365 * ER_TIMEOUT since the response was received. If the response has not been
1366 * received we see if data was received recently. If it has been then we
1367 * continue waiting, otherwise, we abort the command.
1369 static void fc_fcp_timeout(unsigned long data)
1371 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1372 struct fc_rport *rport = fsp->rport;
1373 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1375 if (fc_fcp_lock_pkt(fsp))
1376 return;
1378 if (fsp->cdb_cmd.fc_tm_flags)
1379 goto unlock;
1381 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1383 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1384 fc_fcp_rec(fsp);
1385 else if (fsp->state & FC_SRB_RCV_STATUS)
1386 fc_fcp_complete_locked(fsp);
1387 else
1388 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1389 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1390 unlock:
1391 fc_fcp_unlock_pkt(fsp);
1395 * fc_fcp_rec() - Send a REC ELS request
1396 * @fsp: The FCP packet to send the REC request on
1398 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1400 struct fc_lport *lport;
1401 struct fc_frame *fp;
1402 struct fc_rport *rport;
1403 struct fc_rport_libfc_priv *rpriv;
1405 lport = fsp->lp;
1406 rport = fsp->rport;
1407 rpriv = rport->dd_data;
1408 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1409 fsp->status_code = FC_HRD_ERROR;
1410 fsp->io_status = 0;
1411 fc_fcp_complete_locked(fsp);
1412 return;
1415 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1416 if (!fp)
1417 goto retry;
1419 fr_seq(fp) = fsp->seq_ptr;
1420 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1421 rpriv->local_port->port_id, FC_TYPE_ELS,
1422 FC_FCTL_REQ, 0);
1423 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1424 fc_fcp_rec_resp, fsp,
1425 2 * lport->r_a_tov)) {
1426 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1427 return;
1429 retry:
1430 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1431 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1432 else
1433 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1437 * fc_fcp_rec_resp() - Handler for REC ELS responses
1438 * @seq: The sequence the response is on
1439 * @fp: The response frame
1440 * @arg: The FCP packet the response is on
1442 * If the response is a reject then the scsi layer will handle
1443 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1444 * set the timeout and return. If the I/O was completed then complete the
1445 * exchange and tell the SCSI layer.
1447 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1449 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1450 struct fc_els_rec_acc *recp;
1451 struct fc_els_ls_rjt *rjt;
1452 u32 e_stat;
1453 u8 opcode;
1454 u32 offset;
1455 enum dma_data_direction data_dir;
1456 enum fc_rctl r_ctl;
1457 struct fc_rport_libfc_priv *rpriv;
1459 if (IS_ERR(fp)) {
1460 fc_fcp_rec_error(fsp, fp);
1461 return;
1464 if (fc_fcp_lock_pkt(fsp))
1465 goto out;
1467 fsp->recov_retry = 0;
1468 opcode = fc_frame_payload_op(fp);
1469 if (opcode == ELS_LS_RJT) {
1470 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1471 switch (rjt->er_reason) {
1472 default:
1473 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1474 "reason %d expl %d\n",
1475 fsp->rport->port_id, rjt->er_reason,
1476 rjt->er_explan);
1477 /* fall through */
1478 case ELS_RJT_UNSUP:
1479 FC_FCP_DBG(fsp, "device does not support REC\n");
1480 rpriv = fsp->rport->dd_data;
1482 * if we do not spport RECs or got some bogus
1483 * reason then resetup timer so we check for
1484 * making progress.
1486 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1487 break;
1488 case ELS_RJT_LOGIC:
1489 case ELS_RJT_UNAB:
1491 * If no data transfer, the command frame got dropped
1492 * so we just retry. If data was transferred, we
1493 * lost the response but the target has no record,
1494 * so we abort and retry.
1496 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1497 fsp->xfer_len == 0) {
1498 fc_fcp_retry_cmd(fsp);
1499 break;
1501 fc_fcp_recovery(fsp, FC_ERROR);
1502 break;
1504 } else if (opcode == ELS_LS_ACC) {
1505 if (fsp->state & FC_SRB_ABORTED)
1506 goto unlock_out;
1508 data_dir = fsp->cmd->sc_data_direction;
1509 recp = fc_frame_payload_get(fp, sizeof(*recp));
1510 offset = ntohl(recp->reca_fc4value);
1511 e_stat = ntohl(recp->reca_e_stat);
1513 if (e_stat & ESB_ST_COMPLETE) {
1516 * The exchange is complete.
1518 * For output, we must've lost the response.
1519 * For input, all data must've been sent.
1520 * We lost may have lost the response
1521 * (and a confirmation was requested) and maybe
1522 * some data.
1524 * If all data received, send SRR
1525 * asking for response. If partial data received,
1526 * or gaps, SRR requests data at start of gap.
1527 * Recovery via SRR relies on in-order-delivery.
1529 if (data_dir == DMA_TO_DEVICE) {
1530 r_ctl = FC_RCTL_DD_CMD_STATUS;
1531 } else if (fsp->xfer_contig_end == offset) {
1532 r_ctl = FC_RCTL_DD_CMD_STATUS;
1533 } else {
1534 offset = fsp->xfer_contig_end;
1535 r_ctl = FC_RCTL_DD_SOL_DATA;
1537 fc_fcp_srr(fsp, r_ctl, offset);
1538 } else if (e_stat & ESB_ST_SEQ_INIT) {
1539 unsigned int rec_tov = get_fsp_rec_tov(fsp);
1541 * The remote port has the initiative, so just
1542 * keep waiting for it to complete.
1544 fc_fcp_timer_set(fsp, rec_tov);
1545 } else {
1548 * The exchange is incomplete, we have seq. initiative.
1549 * Lost response with requested confirmation,
1550 * lost confirmation, lost transfer ready or
1551 * lost write data.
1553 * For output, if not all data was received, ask
1554 * for transfer ready to be repeated.
1556 * If we received or sent all the data, send SRR to
1557 * request response.
1559 * If we lost a response, we may have lost some read
1560 * data as well.
1562 r_ctl = FC_RCTL_DD_SOL_DATA;
1563 if (data_dir == DMA_TO_DEVICE) {
1564 r_ctl = FC_RCTL_DD_CMD_STATUS;
1565 if (offset < fsp->data_len)
1566 r_ctl = FC_RCTL_DD_DATA_DESC;
1567 } else if (offset == fsp->xfer_contig_end) {
1568 r_ctl = FC_RCTL_DD_CMD_STATUS;
1569 } else if (fsp->xfer_contig_end < offset) {
1570 offset = fsp->xfer_contig_end;
1572 fc_fcp_srr(fsp, r_ctl, offset);
1575 unlock_out:
1576 fc_fcp_unlock_pkt(fsp);
1577 out:
1578 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1579 fc_frame_free(fp);
1583 * fc_fcp_rec_error() - Handler for REC errors
1584 * @fsp: The FCP packet the error is on
1585 * @fp: The REC frame
1587 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1589 int error = PTR_ERR(fp);
1591 if (fc_fcp_lock_pkt(fsp))
1592 goto out;
1594 switch (error) {
1595 case -FC_EX_CLOSED:
1596 fc_fcp_retry_cmd(fsp);
1597 break;
1599 default:
1600 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1601 fsp, fsp->rport->port_id, error);
1602 fsp->status_code = FC_CMD_PLOGO;
1603 /* fall through */
1605 case -FC_EX_TIMEOUT:
1607 * Assume REC or LS_ACC was lost.
1608 * The exchange manager will have aborted REC, so retry.
1610 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
1611 fsp->rport->port_id, error, fsp->recov_retry,
1612 FC_MAX_RECOV_RETRY);
1613 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1614 fc_fcp_rec(fsp);
1615 else
1616 fc_fcp_recovery(fsp, FC_ERROR);
1617 break;
1619 fc_fcp_unlock_pkt(fsp);
1620 out:
1621 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1625 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1626 * @fsp: The FCP pkt that needs to be aborted
1628 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1630 fsp->status_code = code;
1631 fsp->cdb_status = 0;
1632 fsp->io_status = 0;
1634 * if this fails then we let the scsi command timer fire and
1635 * scsi-ml escalate.
1637 fc_fcp_send_abort(fsp);
1641 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1642 * @fsp: The FCP packet the SRR is to be sent on
1643 * @r_ctl: The R_CTL field for the SRR request
1644 * This is called after receiving status but insufficient data, or
1645 * when expecting status but the request has timed out.
1647 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1649 struct fc_lport *lport = fsp->lp;
1650 struct fc_rport *rport;
1651 struct fc_rport_libfc_priv *rpriv;
1652 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1653 struct fc_seq *seq;
1654 struct fcp_srr *srr;
1655 struct fc_frame *fp;
1656 u8 cdb_op;
1657 unsigned int rec_tov;
1659 rport = fsp->rport;
1660 rpriv = rport->dd_data;
1661 cdb_op = fsp->cdb_cmd.fc_cdb[0];
1663 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1664 rpriv->rp_state != RPORT_ST_READY)
1665 goto retry; /* shouldn't happen */
1666 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1667 if (!fp)
1668 goto retry;
1670 srr = fc_frame_payload_get(fp, sizeof(*srr));
1671 memset(srr, 0, sizeof(*srr));
1672 srr->srr_op = ELS_SRR;
1673 srr->srr_ox_id = htons(ep->oxid);
1674 srr->srr_rx_id = htons(ep->rxid);
1675 srr->srr_r_ctl = r_ctl;
1676 srr->srr_rel_off = htonl(offset);
1678 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1679 rpriv->local_port->port_id, FC_TYPE_FCP,
1680 FC_FCTL_REQ, 0);
1682 rec_tov = get_fsp_rec_tov(fsp);
1683 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
1684 fsp, jiffies_to_msecs(rec_tov));
1685 if (!seq)
1686 goto retry;
1688 fsp->recov_seq = seq;
1689 fsp->xfer_len = offset;
1690 fsp->xfer_contig_end = offset;
1691 fsp->state &= ~FC_SRB_RCV_STATUS;
1692 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1693 return;
1694 retry:
1695 fc_fcp_retry_cmd(fsp);
1699 * fc_fcp_srr_resp() - Handler for SRR response
1700 * @seq: The sequence the SRR is on
1701 * @fp: The SRR frame
1702 * @arg: The FCP packet the SRR is on
1704 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1706 struct fc_fcp_pkt *fsp = arg;
1707 struct fc_frame_header *fh;
1708 unsigned int rec_tov;
1710 if (IS_ERR(fp)) {
1711 fc_fcp_srr_error(fsp, fp);
1712 return;
1715 if (fc_fcp_lock_pkt(fsp))
1716 goto out;
1718 fh = fc_frame_header_get(fp);
1720 * BUG? fc_fcp_srr_error calls exch_done which would release
1721 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1722 * then fc_exch_timeout would be sending an abort. The exch_done
1723 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1724 * an abort response though.
1726 if (fh->fh_type == FC_TYPE_BLS) {
1727 fc_fcp_unlock_pkt(fsp);
1728 return;
1731 fsp->recov_seq = NULL;
1732 switch (fc_frame_payload_op(fp)) {
1733 case ELS_LS_ACC:
1734 fsp->recov_retry = 0;
1735 rec_tov = get_fsp_rec_tov(fsp);
1736 fc_fcp_timer_set(fsp, rec_tov);
1737 break;
1738 case ELS_LS_RJT:
1739 default:
1740 fc_fcp_recovery(fsp, FC_ERROR);
1741 break;
1743 fc_fcp_unlock_pkt(fsp);
1744 fsp->lp->tt.exch_done(seq);
1745 out:
1746 fc_frame_free(fp);
1747 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1751 * fc_fcp_srr_error() - Handler for SRR errors
1752 * @fsp: The FCP packet that the SRR error is on
1753 * @fp: The SRR frame
1755 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1757 if (fc_fcp_lock_pkt(fsp))
1758 goto out;
1759 fsp->lp->tt.exch_done(fsp->recov_seq);
1760 fsp->recov_seq = NULL;
1761 switch (PTR_ERR(fp)) {
1762 case -FC_EX_TIMEOUT:
1763 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1764 fc_fcp_rec(fsp);
1765 else
1766 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1767 break;
1768 case -FC_EX_CLOSED: /* e.g., link failure */
1769 /* fall through */
1770 default:
1771 fc_fcp_retry_cmd(fsp);
1772 break;
1774 fc_fcp_unlock_pkt(fsp);
1775 out:
1776 fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
1780 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1781 * @lport: The local port to be checked
1783 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1785 /* lock ? */
1786 return (lport->state == LPORT_ST_READY) &&
1787 lport->link_up && !lport->qfull;
1791 * fc_queuecommand() - The queuecommand function of the SCSI template
1792 * @shost: The Scsi_Host that the command was issued to
1793 * @cmd: The scsi_cmnd to be executed
1795 * This is the i/o strategy routine, called by the SCSI layer.
1797 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1799 struct fc_lport *lport = shost_priv(shost);
1800 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1801 struct fc_fcp_pkt *fsp;
1802 struct fc_rport_libfc_priv *rpriv;
1803 int rval;
1804 int rc = 0;
1805 struct fcoe_dev_stats *stats;
1807 rval = fc_remote_port_chkready(rport);
1808 if (rval) {
1809 sc_cmd->result = rval;
1810 sc_cmd->scsi_done(sc_cmd);
1811 return 0;
1814 if (!*(struct fc_remote_port **)rport->dd_data) {
1816 * rport is transitioning from blocked/deleted to
1817 * online
1819 sc_cmd->result = DID_IMM_RETRY << 16;
1820 sc_cmd->scsi_done(sc_cmd);
1821 goto out;
1824 rpriv = rport->dd_data;
1826 if (!fc_fcp_lport_queue_ready(lport)) {
1827 if (lport->qfull)
1828 fc_fcp_can_queue_ramp_down(lport);
1829 rc = SCSI_MLQUEUE_HOST_BUSY;
1830 goto out;
1833 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1834 if (fsp == NULL) {
1835 rc = SCSI_MLQUEUE_HOST_BUSY;
1836 goto out;
1840 * build the libfc request pkt
1842 fsp->cmd = sc_cmd; /* save the cmd */
1843 fsp->rport = rport; /* set the remote port ptr */
1846 * set up the transfer length
1848 fsp->data_len = scsi_bufflen(sc_cmd);
1849 fsp->xfer_len = 0;
1852 * setup the data direction
1854 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1855 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1856 fsp->req_flags = FC_SRB_READ;
1857 stats->InputRequests++;
1858 stats->InputBytes += fsp->data_len;
1859 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1860 fsp->req_flags = FC_SRB_WRITE;
1861 stats->OutputRequests++;
1862 stats->OutputBytes += fsp->data_len;
1863 } else {
1864 fsp->req_flags = 0;
1865 stats->ControlRequests++;
1867 put_cpu();
1869 init_timer(&fsp->timer);
1870 fsp->timer.data = (unsigned long)fsp;
1873 * send it to the lower layer
1874 * if we get -1 return then put the request in the pending
1875 * queue.
1877 rval = fc_fcp_pkt_send(lport, fsp);
1878 if (rval != 0) {
1879 fsp->state = FC_SRB_FREE;
1880 fc_fcp_pkt_release(fsp);
1881 rc = SCSI_MLQUEUE_HOST_BUSY;
1883 out:
1884 return rc;
1886 EXPORT_SYMBOL(fc_queuecommand);
1889 * fc_io_compl() - Handle responses for completed commands
1890 * @fsp: The FCP packet that is complete
1892 * Translates fcp_pkt errors to a Linux SCSI errors.
1893 * The fcp packet lock must be held when calling.
1895 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1897 struct fc_fcp_internal *si;
1898 struct scsi_cmnd *sc_cmd;
1899 struct fc_lport *lport;
1900 unsigned long flags;
1902 /* release outstanding ddp context */
1903 fc_fcp_ddp_done(fsp);
1905 fsp->state |= FC_SRB_COMPL;
1906 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1907 spin_unlock_bh(&fsp->scsi_pkt_lock);
1908 del_timer_sync(&fsp->timer);
1909 spin_lock_bh(&fsp->scsi_pkt_lock);
1912 lport = fsp->lp;
1913 si = fc_get_scsi_internal(lport);
1916 * if can_queue ramp down is done then try can_queue ramp up
1917 * since commands are completing now.
1919 if (si->last_can_queue_ramp_down_time)
1920 fc_fcp_can_queue_ramp_up(lport);
1922 sc_cmd = fsp->cmd;
1923 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1924 switch (fsp->status_code) {
1925 case FC_COMPLETE:
1926 if (fsp->cdb_status == 0) {
1928 * good I/O status
1930 sc_cmd->result = DID_OK << 16;
1931 if (fsp->scsi_resid)
1932 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1933 } else {
1935 * transport level I/O was ok but scsi
1936 * has non zero status
1938 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1940 break;
1941 case FC_ERROR:
1942 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1943 "due to FC_ERROR\n");
1944 sc_cmd->result = DID_ERROR << 16;
1945 break;
1946 case FC_DATA_UNDRUN:
1947 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1949 * scsi status is good but transport level
1950 * underrun.
1952 if (fsp->state & FC_SRB_RCV_STATUS) {
1953 sc_cmd->result = DID_OK << 16;
1954 } else {
1955 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
1956 " due to FC_DATA_UNDRUN (trans)\n");
1957 sc_cmd->result = DID_ERROR << 16;
1959 } else {
1961 * scsi got underrun, this is an error
1963 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1964 "due to FC_DATA_UNDRUN (scsi)\n");
1965 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1966 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1968 break;
1969 case FC_DATA_OVRRUN:
1971 * overrun is an error
1973 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1974 "due to FC_DATA_OVRRUN\n");
1975 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1976 break;
1977 case FC_CMD_ABORTED:
1978 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1979 "due to FC_CMD_ABORTED\n");
1980 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1981 break;
1982 case FC_CMD_RESET:
1983 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
1984 "due to FC_CMD_RESET\n");
1985 sc_cmd->result = (DID_RESET << 16);
1986 break;
1987 case FC_HRD_ERROR:
1988 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
1989 "due to FC_HRD_ERROR\n");
1990 sc_cmd->result = (DID_NO_CONNECT << 16);
1991 break;
1992 case FC_CRC_ERROR:
1993 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
1994 "due to FC_CRC_ERROR\n");
1995 sc_cmd->result = (DID_PARITY << 16);
1996 break;
1997 case FC_TIMED_OUT:
1998 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
1999 "due to FC_TIMED_OUT\n");
2000 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
2001 break;
2002 default:
2003 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2004 "due to unknown error\n");
2005 sc_cmd->result = (DID_ERROR << 16);
2006 break;
2009 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
2010 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
2012 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2013 list_del(&fsp->list);
2014 sc_cmd->SCp.ptr = NULL;
2015 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2016 sc_cmd->scsi_done(sc_cmd);
2018 /* release ref from initial allocation in queue command */
2019 fc_fcp_pkt_release(fsp);
2023 * fc_eh_abort() - Abort a command
2024 * @sc_cmd: The SCSI command to abort
2026 * From SCSI host template.
2027 * Send an ABTS to the target device and wait for the response.
2029 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2031 struct fc_fcp_pkt *fsp;
2032 struct fc_lport *lport;
2033 struct fc_fcp_internal *si;
2034 int rc = FAILED;
2035 unsigned long flags;
2037 lport = shost_priv(sc_cmd->device->host);
2038 if (lport->state != LPORT_ST_READY)
2039 return rc;
2040 else if (!lport->link_up)
2041 return rc;
2043 si = fc_get_scsi_internal(lport);
2044 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2045 fsp = CMD_SP(sc_cmd);
2046 if (!fsp) {
2047 /* command completed while scsi eh was setting up */
2048 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2049 return SUCCESS;
2051 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2052 fc_fcp_pkt_hold(fsp);
2053 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2055 if (fc_fcp_lock_pkt(fsp)) {
2056 /* completed while we were waiting for timer to be deleted */
2057 rc = SUCCESS;
2058 goto release_pkt;
2061 rc = fc_fcp_pkt_abort(fsp);
2062 fc_fcp_unlock_pkt(fsp);
2064 release_pkt:
2065 fc_fcp_pkt_release(fsp);
2066 return rc;
2068 EXPORT_SYMBOL(fc_eh_abort);
2071 * fc_eh_device_reset() - Reset a single LUN
2072 * @sc_cmd: The SCSI command which identifies the device whose
2073 * LUN is to be reset
2075 * Set from SCSI host template.
2077 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2079 struct fc_lport *lport;
2080 struct fc_fcp_pkt *fsp;
2081 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2082 int rc = FAILED;
2083 int rval;
2085 rval = fc_remote_port_chkready(rport);
2086 if (rval)
2087 goto out;
2089 lport = shost_priv(sc_cmd->device->host);
2091 if (lport->state != LPORT_ST_READY)
2092 return rc;
2094 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2096 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2097 if (fsp == NULL) {
2098 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2099 goto out;
2103 * Build the libfc request pkt. Do not set the scsi cmnd, because
2104 * the sc passed in is not setup for execution like when sent
2105 * through the queuecommand callout.
2107 fsp->rport = rport; /* set the remote port ptr */
2110 * flush outstanding commands
2112 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2113 fsp->state = FC_SRB_FREE;
2114 fc_fcp_pkt_release(fsp);
2116 out:
2117 return rc;
2119 EXPORT_SYMBOL(fc_eh_device_reset);
2122 * fc_eh_host_reset() - Reset a Scsi_Host.
2123 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2125 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2127 struct Scsi_Host *shost = sc_cmd->device->host;
2128 struct fc_lport *lport = shost_priv(shost);
2129 unsigned long wait_tmo;
2131 FC_SCSI_DBG(lport, "Resetting host\n");
2133 lport->tt.lport_reset(lport);
2134 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2135 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2136 wait_tmo))
2137 msleep(1000);
2139 if (fc_fcp_lport_queue_ready(lport)) {
2140 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2141 "on port (%6.6x)\n", lport->port_id);
2142 return SUCCESS;
2143 } else {
2144 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2145 "port (%6.6x) is not ready.\n",
2146 lport->port_id);
2147 return FAILED;
2150 EXPORT_SYMBOL(fc_eh_host_reset);
2153 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2154 * @sdev: The SCSI device that identifies the SCSI host
2156 * Configures queue depth based on host's cmd_per_len. If not set
2157 * then we use the libfc default.
2159 int fc_slave_alloc(struct scsi_device *sdev)
2161 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2163 if (!rport || fc_remote_port_chkready(rport))
2164 return -ENXIO;
2166 if (sdev->tagged_supported)
2167 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2168 else
2169 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2170 FC_FCP_DFLT_QUEUE_DEPTH);
2172 return 0;
2174 EXPORT_SYMBOL(fc_slave_alloc);
2177 * fc_change_queue_depth() - Change a device's queue depth
2178 * @sdev: The SCSI device whose queue depth is to change
2179 * @qdepth: The new queue depth
2180 * @reason: The resason for the change
2182 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2184 switch (reason) {
2185 case SCSI_QDEPTH_DEFAULT:
2186 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2187 break;
2188 case SCSI_QDEPTH_QFULL:
2189 scsi_track_queue_full(sdev, qdepth);
2190 break;
2191 case SCSI_QDEPTH_RAMP_UP:
2192 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2193 break;
2194 default:
2195 return -EOPNOTSUPP;
2197 return sdev->queue_depth;
2199 EXPORT_SYMBOL(fc_change_queue_depth);
2202 * fc_change_queue_type() - Change a device's queue type
2203 * @sdev: The SCSI device whose queue depth is to change
2204 * @tag_type: Identifier for queue type
2206 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2208 if (sdev->tagged_supported) {
2209 scsi_set_tag_type(sdev, tag_type);
2210 if (tag_type)
2211 scsi_activate_tcq(sdev, sdev->queue_depth);
2212 else
2213 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2214 } else
2215 tag_type = 0;
2217 return tag_type;
2219 EXPORT_SYMBOL(fc_change_queue_type);
2222 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2223 * @lport: The local port that no longer needs the FCP layer
2225 void fc_fcp_destroy(struct fc_lport *lport)
2227 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2229 if (!list_empty(&si->scsi_pkt_queue))
2230 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2231 "port (%6.6x)\n", lport->port_id);
2233 mempool_destroy(si->scsi_pkt_pool);
2234 kfree(si);
2235 lport->scsi_priv = NULL;
2237 EXPORT_SYMBOL(fc_fcp_destroy);
2239 int fc_setup_fcp(void)
2241 int rc = 0;
2243 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2244 sizeof(struct fc_fcp_pkt),
2245 0, SLAB_HWCACHE_ALIGN, NULL);
2246 if (!scsi_pkt_cachep) {
2247 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2248 "module load failed!");
2249 rc = -ENOMEM;
2252 return rc;
2255 void fc_destroy_fcp(void)
2257 if (scsi_pkt_cachep)
2258 kmem_cache_destroy(scsi_pkt_cachep);
2262 * fc_fcp_init() - Initialize the FCP layer for a local port
2263 * @lport: The local port to initialize the exchange layer for
2265 int fc_fcp_init(struct fc_lport *lport)
2267 int rc;
2268 struct fc_fcp_internal *si;
2270 if (!lport->tt.fcp_cmd_send)
2271 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2273 if (!lport->tt.fcp_cleanup)
2274 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2276 if (!lport->tt.fcp_abort_io)
2277 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2279 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2280 if (!si)
2281 return -ENOMEM;
2282 lport->scsi_priv = si;
2283 si->max_can_queue = lport->host->can_queue;
2284 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2285 spin_lock_init(&si->scsi_queue_lock);
2287 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2288 if (!si->scsi_pkt_pool) {
2289 rc = -ENOMEM;
2290 goto free_internal;
2292 return 0;
2294 free_internal:
2295 kfree(si);
2296 return rc;
2298 EXPORT_SYMBOL(fc_fcp_init);