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
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>
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)
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;
87 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
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
118 #define FC_TRANS_ERR 5
119 #define FC_DATA_OVRRUN 6
120 #define FC_DATA_UNDRUN 7
122 #define FC_HRD_ERROR 9
123 #define FC_CRC_ERROR 10
124 #define FC_TIMED_OUT 11
125 #define FC_TRANS_RESET 12
128 * Error recovery timeout values.
130 #define FC_SCSI_TM_TOV (10 * HZ)
131 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
132 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
134 #define FC_MAX_ERROR_CNT 5
135 #define FC_MAX_RECOV_RETRY 3
137 #define FC_FCP_DFLT_QUEUE_DEPTH 32
140 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
141 * @lport: The local port that the FCP packet is for
142 * @gfp: GFP flags for allocation
144 * Return value: fcp_pkt structure or null on allocation failure.
145 * Context: Can be called from process context, no lock is required.
147 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
149 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
150 struct fc_fcp_pkt *fsp;
152 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
154 memset(fsp, 0, sizeof(*fsp));
156 fsp->xfer_ddp = FC_XID_UNKNOWN;
157 refcount_set(&fsp->ref_cnt, 1);
158 init_timer(&fsp->timer);
159 fsp->timer.data = (unsigned long)fsp;
160 INIT_LIST_HEAD(&fsp->list);
161 spin_lock_init(&fsp->scsi_pkt_lock);
163 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++;
170 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
171 * @fsp: The FCP packet to be released
173 * Context: Can be called from process or interrupt context,
174 * no lock is required.
176 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
178 if (refcount_dec_and_test(&fsp->ref_cnt)) {
179 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
181 mempool_free(fsp, si->scsi_pkt_pool);
186 * fc_fcp_pkt_hold() - Hold a fcp_pkt
187 * @fsp: The FCP packet to be held
189 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
191 refcount_inc(&fsp->ref_cnt);
195 * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt
196 * @seq: The sequence that the FCP packet is on (required by destructor API)
197 * @fsp: The FCP packet to be released
199 * This routine is called by a destructor callback in the fc_exch_seq_send()
200 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
201 * argument even though it is not used by this routine.
203 * Context: No locking required.
205 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
207 fc_fcp_pkt_release(fsp);
211 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
212 * @fsp: The FCP packet to be locked and incremented
214 * We should only return error if we return a command to SCSI-ml before
215 * getting a response. This can happen in cases where we send a abort, but
216 * do not wait for the response and the abort and command can be passing
217 * each other on the wire/network-layer.
219 * Note: this function locks the packet and gets a reference to allow
220 * callers to call the completion function while the lock is held and
221 * not have to worry about the packets refcount.
223 * TODO: Maybe we should just have callers grab/release the lock and
224 * have a function that they call to verify the fsp and grab a ref if
227 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
229 spin_lock_bh(&fsp->scsi_pkt_lock);
230 if (fsp->state & FC_SRB_COMPL) {
231 spin_unlock_bh(&fsp->scsi_pkt_lock);
235 fc_fcp_pkt_hold(fsp);
240 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
242 * @fsp: The FCP packet to be unlocked and decremented
244 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
246 spin_unlock_bh(&fsp->scsi_pkt_lock);
247 fc_fcp_pkt_release(fsp);
251 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
252 * @fsp: The FCP packet to start a timer for
253 * @delay: The timeout period in jiffies
255 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
257 if (!(fsp->state & FC_SRB_COMPL)) {
258 mod_timer(&fsp->timer, jiffies + delay);
259 fsp->timer_delay = delay;
263 static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp)
265 fsp->state |= FC_SRB_ABORTED;
266 fsp->state &= ~FC_SRB_ABORT_PENDING;
268 if (fsp->wait_for_comp)
269 complete(&fsp->tm_done);
271 fc_fcp_complete_locked(fsp);
275 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
277 * @fsp: The FCP packet to abort exchanges on
279 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
286 per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++;
289 fsp->state |= FC_SRB_ABORT_PENDING;
290 rc = fc_seq_exch_abort(fsp->seq_ptr, 0);
292 * fc_seq_exch_abort() might return -ENXIO if
293 * the sequence is already completed
296 fc_fcp_abort_done(fsp);
303 * fc_fcp_retry_cmd() - Retry a fcp_pkt
304 * @fsp: The FCP packet to be retried
306 * Sets the status code to be FC_ERROR and then calls
307 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
308 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
309 * The SCSI-ml will retry the command.
311 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code)
314 fc_exch_done(fsp->seq_ptr);
318 fsp->state &= ~FC_SRB_ABORT_PENDING;
320 fsp->status_code = status_code;
321 fc_fcp_complete_locked(fsp);
325 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
326 * @fsp: The FCP packet that will manage the DDP frames
327 * @xid: The XID that will be used for the DDP exchange
329 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
331 struct fc_lport *lport;
334 if ((fsp->req_flags & FC_SRB_READ) &&
335 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
336 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
337 scsi_sg_count(fsp->cmd)))
343 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
344 * DDP related resources for a fcp_pkt
345 * @fsp: The FCP packet that DDP had been used on
347 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
349 struct fc_lport *lport;
354 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
358 if (lport->tt.ddp_done) {
359 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
360 fsp->xfer_ddp = FC_XID_UNKNOWN;
365 * fc_fcp_can_queue_ramp_up() - increases can_queue
366 * @lport: lport to ramp up can_queue
368 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
370 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
374 spin_lock_irqsave(lport->host->host_lock, flags);
376 if (si->last_can_queue_ramp_up_time &&
377 (time_before(jiffies, si->last_can_queue_ramp_up_time +
378 FC_CAN_QUEUE_PERIOD)))
381 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
382 FC_CAN_QUEUE_PERIOD))
385 si->last_can_queue_ramp_up_time = jiffies;
387 can_queue = lport->host->can_queue << 1;
388 if (can_queue >= si->max_can_queue) {
389 can_queue = si->max_can_queue;
390 si->last_can_queue_ramp_down_time = 0;
392 lport->host->can_queue = can_queue;
393 shost_printk(KERN_ERR, lport->host, "libfc: increased "
394 "can_queue to %d.\n", can_queue);
397 spin_unlock_irqrestore(lport->host->host_lock, flags);
401 * fc_fcp_can_queue_ramp_down() - reduces can_queue
402 * @lport: lport to reduce can_queue
404 * If we are getting memory allocation failures, then we may
405 * be trying to execute too many commands. We let the running
406 * commands complete or timeout, then try again with a reduced
407 * can_queue. Eventually we will hit the point where we run
408 * on all reserved structs.
410 static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
412 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
415 bool changed = false;
417 spin_lock_irqsave(lport->host->host_lock, flags);
419 if (si->last_can_queue_ramp_down_time &&
420 (time_before(jiffies, si->last_can_queue_ramp_down_time +
421 FC_CAN_QUEUE_PERIOD)))
424 si->last_can_queue_ramp_down_time = jiffies;
426 can_queue = lport->host->can_queue;
430 lport->host->can_queue = can_queue;
434 spin_unlock_irqrestore(lport->host->host_lock, flags);
439 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
440 * @lport: fc lport struct
441 * @len: payload length
443 * Allocates fc_frame structure and buffer but if fails to allocate
444 * then reduce can_queue.
446 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
451 fp = fc_frame_alloc(lport, len);
455 per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++;
458 fc_fcp_can_queue_ramp_down(lport);
459 shost_printk(KERN_ERR, lport->host,
460 "libfc: Could not allocate frame, "
461 "reducing can_queue to %d.\n", lport->host->can_queue);
466 * get_fsp_rec_tov() - Helper function to get REC_TOV
467 * @fsp: the FCP packet
469 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
471 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
473 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
474 unsigned int e_d_tov = FC_DEF_E_D_TOV;
476 if (rpriv && rpriv->e_d_tov > e_d_tov)
477 e_d_tov = rpriv->e_d_tov;
478 return msecs_to_jiffies(e_d_tov) + HZ;
482 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
483 * @fsp: The FCP packet the data is on
484 * @fp: The data frame
486 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
488 struct scsi_cmnd *sc = fsp->cmd;
489 struct fc_lport *lport = fsp->lp;
490 struct fc_stats *stats;
491 struct fc_frame_header *fh;
498 struct scatterlist *sg;
500 u8 host_bcode = FC_COMPLETE;
502 fh = fc_frame_header_get(fp);
503 offset = ntohl(fh->fh_parm_offset);
504 start_offset = offset;
505 len = fr_len(fp) - sizeof(*fh);
506 buf = fc_frame_payload_get(fp, 0);
509 * if this I/O is ddped then clear it and initiate recovery since data
510 * frames are expected to be placed directly in that case.
512 * Indicate error to scsi-ml because something went wrong with the
513 * ddp handling to get us here.
515 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
516 fc_fcp_ddp_done(fsp);
517 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
518 host_bcode = FC_ERROR;
521 if (offset + len > fsp->data_len) {
522 /* this should never happen */
523 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
524 fc_frame_crc_check(fp))
526 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
527 "data_len %x\n", len, offset, fsp->data_len);
529 /* Data is corrupted indicate scsi-ml should retry */
530 host_bcode = FC_DATA_OVRRUN;
533 if (offset != fsp->xfer_len)
534 fsp->state |= FC_SRB_DISCONTIG;
536 sg = scsi_sglist(sc);
537 nents = scsi_sg_count(sc);
539 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
540 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
543 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
544 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
546 buf = fc_frame_payload_get(fp, 0);
548 crc = crc32(crc, buf + len, 4 - (len % 4));
550 if (~crc != le32_to_cpu(fr_crc(fp))) {
552 stats = per_cpu_ptr(lport->stats, get_cpu());
553 stats->ErrorFrames++;
554 /* per cpu count, not total count, but OK for limit */
555 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
556 printk(KERN_WARNING "libfc: CRC error on data "
557 "frame for port (%6.6x)\n",
561 * Assume the frame is total garbage.
562 * We may have copied it over the good part
564 * If so, we need to retry the entire operation.
565 * Otherwise, ignore it.
567 if (fsp->state & FC_SRB_DISCONTIG) {
568 host_bcode = FC_CRC_ERROR;
575 if (fsp->xfer_contig_end == start_offset)
576 fsp->xfer_contig_end += copy_len;
577 fsp->xfer_len += copy_len;
580 * In the very rare event that this data arrived after the response
581 * and completes the transfer, call the completion handler.
583 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
584 fsp->xfer_len == fsp->data_len - fsp->scsi_resid) {
585 FC_FCP_DBG( fsp, "complete out-of-order sequence\n" );
586 fc_fcp_complete_locked(fsp);
590 fc_fcp_recovery(fsp, host_bcode);
594 * fc_fcp_send_data() - Send SCSI data to a target
595 * @fsp: The FCP packet the data is on
596 * @sp: The sequence the data is to be sent on
597 * @offset: The starting offset for this data request
598 * @seq_blen: The burst length for this data request
600 * Called after receiving a Transfer Ready data descriptor.
601 * If the LLD is capable of sequence offload then send down the
602 * seq_blen amount of data in single frame, otherwise send
603 * multiple frames of the maximum frame payload supported by
606 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
607 size_t offset, size_t seq_blen)
610 struct scsi_cmnd *sc;
611 struct scatterlist *sg;
612 struct fc_frame *fp = NULL;
613 struct fc_lport *lport = fsp->lp;
619 size_t frame_offset, fh_parm_offset;
624 int using_sg = lport->sg_supp;
627 WARN_ON(seq_blen <= 0);
628 if (unlikely(offset + seq_blen > fsp->data_len)) {
629 /* this should never happen */
630 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
631 "offset %zx\n", seq_blen, offset);
632 fc_fcp_send_abort(fsp);
634 } else if (offset != fsp->xfer_len) {
635 /* Out of Order Data Request - no problem, but unexpected. */
636 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
637 "seq_blen %zx offset %zx\n", seq_blen, offset);
641 * if LLD is capable of seq_offload then set transport
642 * burst length (t_blen) to seq_blen, otherwise set t_blen
643 * to max FC frame payload previously set in fsp->max_payload.
645 t_blen = fsp->max_payload;
646 if (lport->seq_offload) {
647 t_blen = min(seq_blen, (size_t)lport->lso_max);
648 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
649 fsp, seq_blen, lport->lso_max, t_blen);
653 t_blen &= ~(512 - 1); /* round down to block size */
656 remaining = seq_blen;
657 fh_parm_offset = frame_offset = offset;
659 seq = fc_seq_start_next(seq);
660 f_ctl = FC_FC_REL_OFF;
663 sg = scsi_sglist(sc);
665 while (remaining > 0 && sg) {
666 if (offset >= sg->length) {
667 offset -= sg->length;
672 tlen = min(t_blen, remaining);
675 * TODO. Temporary workaround. fc_seq_send() can't
676 * handle odd lengths in non-linear skbs.
677 * This will be the final fragment only.
681 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
685 data = fc_frame_header_get(fp) + 1;
686 fh_parm_offset = frame_offset;
687 fr_max_payload(fp) = fsp->max_payload;
690 off = offset + sg->offset;
691 sg_bytes = min(tlen, sg->length - offset);
692 sg_bytes = min(sg_bytes,
693 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
694 page = sg_page(sg) + (off >> PAGE_SHIFT);
697 skb_fill_page_desc(fp_skb(fp),
698 skb_shinfo(fp_skb(fp))->nr_frags,
699 page, off & ~PAGE_MASK, sg_bytes);
700 fp_skb(fp)->data_len += sg_bytes;
701 fr_len(fp) += sg_bytes;
702 fp_skb(fp)->truesize += PAGE_SIZE;
705 * The scatterlist item may be bigger than PAGE_SIZE,
706 * but we must not cross pages inside the kmap.
708 page_addr = kmap_atomic(page);
709 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
711 kunmap_atomic(page_addr);
715 frame_offset += sg_bytes;
717 remaining -= sg_bytes;
719 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
724 * Send sequence with transfer sequence initiative in case
725 * this is last FCP frame of the sequence.
728 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
730 ep = fc_seq_exch(seq);
731 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
732 FC_TYPE_FCP, f_ctl, fh_parm_offset);
735 * send fragment using for a sequence.
737 error = fc_seq_send(lport, seq, fp);
739 WARN_ON(1); /* send error should be rare */
744 fsp->xfer_len += seq_blen; /* premature count? */
749 * fc_fcp_abts_resp() - Receive an ABTS response
750 * @fsp: The FCP packet that is being aborted
751 * @fp: The response frame
753 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
756 struct fc_ba_rjt *brp;
757 struct fc_frame_header *fh;
759 fh = fc_frame_header_get(fp);
760 switch (fh->fh_r_ctl) {
764 brp = fc_frame_payload_get(fp, sizeof(*brp));
765 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
770 * we will let the command timeout
771 * and scsi-ml recover in this case,
772 * therefore cleared the ba_done flag.
778 fc_fcp_abort_done(fsp);
782 * fc_fcp_recv() - Receive an FCP frame
783 * @seq: The sequence the frame is on
784 * @fp: The received frame
785 * @arg: The related FCP packet
787 * Context: Called from Soft IRQ context. Can not be called
788 * holding the FCP packet list lock.
790 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
792 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
793 struct fc_lport *lport = fsp->lp;
794 struct fc_frame_header *fh;
795 struct fcp_txrdy *dd;
800 fc_fcp_error(fsp, fp);
804 fh = fc_frame_header_get(fp);
805 r_ctl = fh->fh_r_ctl;
807 if (lport->state != LPORT_ST_READY) {
808 FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n",
809 lport->state, r_ctl);
812 if (fc_fcp_lock_pkt(fsp))
815 if (fh->fh_type == FC_TYPE_BLS) {
816 fc_fcp_abts_resp(fsp, fp);
820 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) {
821 FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl);
825 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
827 * received XFER RDY from the target
828 * need to send data to the target
830 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
831 dd = fc_frame_payload_get(fp, sizeof(*dd));
834 rc = fc_fcp_send_data(fsp, seq,
835 (size_t) ntohl(dd->ft_data_ro),
836 (size_t) ntohl(dd->ft_burst_len));
838 seq->rec_data = fsp->xfer_len;
839 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
841 * received a DATA frame
842 * next we will copy the data to the system buffer
844 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
845 fc_fcp_recv_data(fsp, fp);
846 seq->rec_data = fsp->xfer_contig_end;
847 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
848 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
850 fc_fcp_resp(fsp, fp);
852 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
855 fc_fcp_unlock_pkt(fsp);
861 * fc_fcp_resp() - Handler for FCP responses
862 * @fsp: The FCP packet the response is for
863 * @fp: The response frame
865 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
867 struct fc_frame_header *fh;
868 struct fcp_resp *fc_rp;
869 struct fcp_resp_ext *rp_ex;
870 struct fcp_resp_rsp_info *fc_rp_info;
878 fh = (struct fc_frame_header *)fr_hdr(fp);
879 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
882 fc_rp = (struct fcp_resp *)(fh + 1);
883 fsp->cdb_status = fc_rp->fr_status;
884 flags = fc_rp->fr_flags;
885 fsp->scsi_comp_flags = flags;
886 expected_len = fsp->data_len;
888 /* if ddp, update xfer len */
889 fc_fcp_ddp_done(fsp);
891 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
892 rp_ex = (void *)(fc_rp + 1);
893 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
894 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
896 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
897 if (flags & FCP_RSP_LEN_VAL) {
898 respl = ntohl(rp_ex->fr_rsp_len);
899 if ((respl != FCP_RESP_RSP_INFO_LEN4) &&
900 (respl != FCP_RESP_RSP_INFO_LEN8))
902 if (fsp->wait_for_comp) {
903 /* Abuse cdb_status for rsp code */
904 fsp->cdb_status = fc_rp_info->rsp_code;
905 complete(&fsp->tm_done);
907 * tmfs will not have any scsi cmd so
913 if (flags & FCP_SNS_LEN_VAL) {
914 snsl = ntohl(rp_ex->fr_sns_len);
915 if (snsl > SCSI_SENSE_BUFFERSIZE)
916 snsl = SCSI_SENSE_BUFFERSIZE;
917 memcpy(fsp->cmd->sense_buffer,
918 (char *)fc_rp_info + respl, snsl);
921 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
922 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
924 if (flags & FCP_RESID_UNDER) {
925 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
927 * The cmnd->underflow is the minimum number of
928 * bytes that must be transferred for this
929 * command. Provided a sense condition is not
930 * present, make sure the actual amount
931 * transferred is at least the underflow value
934 if (!(flags & FCP_SNS_LEN_VAL) &&
935 (fc_rp->fr_status == 0) &&
936 (scsi_bufflen(fsp->cmd) -
937 fsp->scsi_resid) < fsp->cmd->underflow)
939 expected_len -= fsp->scsi_resid;
941 fsp->status_code = FC_ERROR;
945 fsp->state |= FC_SRB_RCV_STATUS;
948 * Check for missing or extra data frames.
950 if (unlikely(fsp->cdb_status == SAM_STAT_GOOD &&
951 fsp->xfer_len != expected_len)) {
952 if (fsp->xfer_len < expected_len) {
954 * Some data may be queued locally,
955 * Wait a at least one jiffy to see if it is delivered.
956 * If this expires without data, we may do SRR.
958 if (fsp->lp->qfull) {
959 FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n",
960 fsp->rport->port_id);
963 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun "
964 "len %x, data len %x\n",
966 fsp->xfer_len, expected_len, fsp->data_len);
967 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
970 fsp->status_code = FC_DATA_OVRRUN;
971 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
972 "len %x, data len %x\n",
974 fsp->xfer_len, expected_len, fsp->data_len);
976 fc_fcp_complete_locked(fsp);
980 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
981 "snsl %u\n", flags, fr_len(fp), respl, snsl);
983 fsp->status_code = FC_ERROR;
984 fc_fcp_complete_locked(fsp);
988 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
990 * @fsp: The FCP packet to be completed
992 * This function may sleep if a timer is pending. The packet lock must be
993 * held, and the host lock must not be held.
995 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
997 struct fc_lport *lport = fsp->lp;
1002 if (fsp->state & FC_SRB_ABORT_PENDING)
1005 if (fsp->state & FC_SRB_ABORTED) {
1006 if (!fsp->status_code)
1007 fsp->status_code = FC_CMD_ABORTED;
1010 * Test for transport underrun, independent of response
1013 if (fsp->cdb_status == SAM_STAT_GOOD &&
1014 fsp->xfer_len < fsp->data_len && !fsp->io_status &&
1015 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
1016 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
1017 FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n",
1018 fsp->xfer_len, fsp->data_len);
1019 fsp->status_code = FC_DATA_UNDRUN;
1025 fsp->seq_ptr = NULL;
1026 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
1027 struct fc_frame *conf_frame;
1030 csp = fc_seq_start_next(seq);
1031 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
1033 f_ctl = FC_FC_SEQ_INIT;
1034 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
1035 ep = fc_seq_exch(seq);
1036 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
1038 FC_TYPE_FCP, f_ctl, 0);
1039 fc_seq_send(lport, csp, conf_frame);
1045 * Some resets driven by SCSI are not I/Os and do not have
1046 * SCSI commands associated with the requests. We should not
1047 * call I/O completion if we do not have a SCSI command.
1054 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
1055 * @fsp: The FCP packet whose exchanges should be canceled
1056 * @error: The reason for the cancellation
1058 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
1061 fc_exch_done(fsp->seq_ptr);
1062 fsp->seq_ptr = NULL;
1064 fsp->status_code = error;
1068 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1069 * @lport: The local port whose exchanges should be canceled
1070 * @id: The target's ID
1072 * @error: The reason for cancellation
1074 * If lun or id is -1, they are ignored.
1076 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1077 unsigned int lun, int error)
1079 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1080 struct fc_fcp_pkt *fsp;
1081 struct scsi_cmnd *sc_cmd;
1082 unsigned long flags;
1084 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1086 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1088 if (id != -1 && scmd_id(sc_cmd) != id)
1091 if (lun != -1 && sc_cmd->device->lun != lun)
1094 fc_fcp_pkt_hold(fsp);
1095 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1097 spin_lock_bh(&fsp->scsi_pkt_lock);
1098 if (!(fsp->state & FC_SRB_COMPL)) {
1099 fsp->state |= FC_SRB_COMPL;
1101 * TODO: dropping scsi_pkt_lock and then reacquiring
1102 * again around fc_fcp_cleanup_cmd() is required,
1103 * since fc_fcp_cleanup_cmd() calls into
1104 * fc_seq_set_resp() and that func preempts cpu using
1105 * schedule. May be schedule and related code should be
1106 * removed instead of unlocking here to avoid scheduling
1109 spin_unlock_bh(&fsp->scsi_pkt_lock);
1111 fc_fcp_cleanup_cmd(fsp, error);
1113 spin_lock_bh(&fsp->scsi_pkt_lock);
1116 spin_unlock_bh(&fsp->scsi_pkt_lock);
1118 fc_fcp_pkt_release(fsp);
1119 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1121 * while we dropped the lock multiple pkts could
1122 * have been released, so we have to start over.
1126 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1130 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1131 * @lport: The local port whose exchanges are to be aborted
1133 static void fc_fcp_abort_io(struct fc_lport *lport)
1135 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1139 * fc_fcp_pkt_send() - Send a fcp_pkt
1140 * @lport: The local port to send the FCP packet on
1141 * @fsp: The FCP packet to send
1143 * Return: Zero for success and -1 for failure
1144 * Locks: Called without locks held
1146 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1149 unsigned long flags;
1152 fsp->cmd->SCp.ptr = (char *)fsp;
1153 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1154 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1156 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun);
1157 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1159 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1160 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1161 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1162 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1164 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1165 fsp->cmd->SCp.ptr = NULL;
1166 list_del(&fsp->list);
1167 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1174 * fc_fcp_cmd_send() - Send a FCP command
1175 * @lport: The local port to send the command on
1176 * @fsp: The FCP packet the command is on
1177 * @resp: The handler for the response
1179 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1180 void (*resp)(struct fc_seq *,
1181 struct fc_frame *fp,
1184 struct fc_frame *fp;
1186 struct fc_rport *rport;
1187 struct fc_rport_libfc_priv *rpriv;
1188 const size_t len = sizeof(fsp->cdb_cmd);
1191 if (fc_fcp_lock_pkt(fsp))
1194 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1200 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1203 fsp->max_payload = rport->maxframe_size;
1204 rpriv = rport->dd_data;
1206 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1207 rpriv->local_port->port_id, FC_TYPE_FCP,
1210 seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0);
1216 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1218 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1219 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1220 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1223 fc_fcp_unlock_pkt(fsp);
1228 * fc_fcp_error() - Handler for FCP layer errors
1229 * @fsp: The FCP packet the error is on
1230 * @fp: The frame that has errored
1232 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1234 int error = PTR_ERR(fp);
1236 if (fc_fcp_lock_pkt(fsp))
1239 if (error == -FC_EX_CLOSED) {
1240 fc_fcp_retry_cmd(fsp, FC_ERROR);
1245 * clear abort pending, because the lower layer
1246 * decided to force completion.
1248 fsp->state &= ~FC_SRB_ABORT_PENDING;
1249 fsp->status_code = FC_CMD_PLOGO;
1250 fc_fcp_complete_locked(fsp);
1252 fc_fcp_unlock_pkt(fsp);
1256 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1257 * @fsp: The FCP packet to abort on
1259 * Called to send an abort and then wait for abort completion
1261 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1264 unsigned long ticks_left;
1266 FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state);
1267 if (fc_fcp_send_abort(fsp)) {
1268 FC_FCP_DBG(fsp, "failed to send abort\n");
1272 if (fsp->state & FC_SRB_ABORTED) {
1273 FC_FCP_DBG(fsp, "target abort cmd completed\n");
1277 init_completion(&fsp->tm_done);
1278 fsp->wait_for_comp = 1;
1280 spin_unlock_bh(&fsp->scsi_pkt_lock);
1281 ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1283 spin_lock_bh(&fsp->scsi_pkt_lock);
1284 fsp->wait_for_comp = 0;
1287 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1288 } else if (fsp->state & FC_SRB_ABORTED) {
1289 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1291 fc_fcp_complete_locked(fsp);
1298 * fc_lun_reset_send() - Send LUN reset command
1299 * @data: The FCP packet that identifies the LUN to be reset
1301 static void fc_lun_reset_send(unsigned long data)
1303 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1304 struct fc_lport *lport = fsp->lp;
1306 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1307 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1309 if (fc_fcp_lock_pkt(fsp))
1311 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1312 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1313 fc_fcp_unlock_pkt(fsp);
1318 * fc_lun_reset() - Send a LUN RESET command to a device
1319 * and wait for the reply
1320 * @lport: The local port to sent the command on
1321 * @fsp: The FCP packet that identifies the LUN to be reset
1322 * @id: The SCSI command ID
1323 * @lun: The LUN ID to be reset
1325 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1326 unsigned int id, unsigned int lun)
1330 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1331 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1332 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun);
1334 fsp->wait_for_comp = 1;
1335 init_completion(&fsp->tm_done);
1337 fc_lun_reset_send((unsigned long)fsp);
1340 * wait for completion of reset
1341 * after that make sure all commands are terminated
1343 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1345 spin_lock_bh(&fsp->scsi_pkt_lock);
1346 fsp->state |= FC_SRB_COMPL;
1347 spin_unlock_bh(&fsp->scsi_pkt_lock);
1349 del_timer_sync(&fsp->timer);
1351 spin_lock_bh(&fsp->scsi_pkt_lock);
1353 fc_exch_done(fsp->seq_ptr);
1354 fsp->seq_ptr = NULL;
1356 fsp->wait_for_comp = 0;
1357 spin_unlock_bh(&fsp->scsi_pkt_lock);
1360 FC_SCSI_DBG(lport, "lun reset failed\n");
1364 /* cdb_status holds the tmf's rsp code */
1365 if (fsp->cdb_status != FCP_TMF_CMPL)
1368 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1369 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1374 * fc_tm_done() - Task Management response handler
1375 * @seq: The sequence that the response is on
1376 * @fp: The response frame
1377 * @arg: The FCP packet the response is for
1379 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1381 struct fc_fcp_pkt *fsp = arg;
1382 struct fc_frame_header *fh;
1386 * If there is an error just let it timeout or wait
1387 * for TMF to be aborted if it timedout.
1389 * scsi-eh will escalate for when either happens.
1394 if (fc_fcp_lock_pkt(fsp))
1398 * raced with eh timeout handler.
1400 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1403 fh = fc_frame_header_get(fp);
1404 if (fh->fh_type != FC_TYPE_BLS)
1405 fc_fcp_resp(fsp, fp);
1406 fsp->seq_ptr = NULL;
1409 fc_fcp_unlock_pkt(fsp);
1415 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1416 * @lport: The local port to be cleaned up
1418 static void fc_fcp_cleanup(struct fc_lport *lport)
1420 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1424 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1425 * @data: The FCP packet that has timed out
1427 * If REC is supported then just issue it and return. The REC exchange will
1428 * complete or time out and recovery can continue at that point. Otherwise,
1429 * if the response has been received without all the data it has been
1430 * ER_TIMEOUT since the response was received. If the response has not been
1431 * received we see if data was received recently. If it has been then we
1432 * continue waiting, otherwise, we abort the command.
1434 static void fc_fcp_timeout(unsigned long data)
1436 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1437 struct fc_rport *rport = fsp->rport;
1438 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1440 if (fc_fcp_lock_pkt(fsp))
1443 if (fsp->cdb_cmd.fc_tm_flags)
1446 if (fsp->lp->qfull) {
1447 FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n",
1449 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1450 fc_fcp_timer_set(fsp, fsp->timer_delay);
1453 FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n",
1454 fsp->timer_delay, rpriv->flags, fsp->state);
1455 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1457 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1459 else if (fsp->state & FC_SRB_RCV_STATUS)
1460 fc_fcp_complete_locked(fsp);
1462 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1463 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1465 fc_fcp_unlock_pkt(fsp);
1469 * fc_fcp_rec() - Send a REC ELS request
1470 * @fsp: The FCP packet to send the REC request on
1472 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1474 struct fc_lport *lport;
1475 struct fc_frame *fp;
1476 struct fc_rport *rport;
1477 struct fc_rport_libfc_priv *rpriv;
1481 rpriv = rport->dd_data;
1482 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1483 fsp->status_code = FC_HRD_ERROR;
1485 fc_fcp_complete_locked(fsp);
1489 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1493 fr_seq(fp) = fsp->seq_ptr;
1494 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1495 rpriv->local_port->port_id, FC_TYPE_ELS,
1497 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1498 fc_fcp_rec_resp, fsp,
1499 2 * lport->r_a_tov)) {
1500 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1504 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1505 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1507 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1511 * fc_fcp_rec_resp() - Handler for REC ELS responses
1512 * @seq: The sequence the response is on
1513 * @fp: The response frame
1514 * @arg: The FCP packet the response is on
1516 * If the response is a reject then the scsi layer will handle
1517 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1518 * set the timeout and return. If the I/O was completed then complete the
1519 * exchange and tell the SCSI layer.
1521 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1523 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1524 struct fc_els_rec_acc *recp;
1525 struct fc_els_ls_rjt *rjt;
1529 enum dma_data_direction data_dir;
1531 struct fc_rport_libfc_priv *rpriv;
1534 fc_fcp_rec_error(fsp, fp);
1538 if (fc_fcp_lock_pkt(fsp))
1541 fsp->recov_retry = 0;
1542 opcode = fc_frame_payload_op(fp);
1543 if (opcode == ELS_LS_RJT) {
1544 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1545 switch (rjt->er_reason) {
1548 "device %x invalid REC reject %d/%d\n",
1549 fsp->rport->port_id, rjt->er_reason,
1553 FC_FCP_DBG(fsp, "device does not support REC\n");
1554 rpriv = fsp->rport->dd_data;
1556 * if we do not spport RECs or got some bogus
1557 * reason then resetup timer so we check for
1560 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1564 FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n",
1565 fsp->rport->port_id, rjt->er_reason,
1568 * If response got lost or is stuck in the
1569 * queue somewhere we have no idea if and when
1570 * the response will be received. So quarantine
1571 * the xid and retry the command.
1573 if (rjt->er_explan == ELS_EXPL_OXID_RXID) {
1574 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1575 ep->state |= FC_EX_QUARANTINE;
1576 fsp->state |= FC_SRB_ABORTED;
1577 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);
1580 fc_fcp_recovery(fsp, FC_TRANS_RESET);
1583 } else if (opcode == ELS_LS_ACC) {
1584 if (fsp->state & FC_SRB_ABORTED)
1587 data_dir = fsp->cmd->sc_data_direction;
1588 recp = fc_frame_payload_get(fp, sizeof(*recp));
1589 offset = ntohl(recp->reca_fc4value);
1590 e_stat = ntohl(recp->reca_e_stat);
1592 if (e_stat & ESB_ST_COMPLETE) {
1595 * The exchange is complete.
1597 * For output, we must've lost the response.
1598 * For input, all data must've been sent.
1599 * We lost may have lost the response
1600 * (and a confirmation was requested) and maybe
1603 * If all data received, send SRR
1604 * asking for response. If partial data received,
1605 * or gaps, SRR requests data at start of gap.
1606 * Recovery via SRR relies on in-order-delivery.
1608 if (data_dir == DMA_TO_DEVICE) {
1609 r_ctl = FC_RCTL_DD_CMD_STATUS;
1610 } else if (fsp->xfer_contig_end == offset) {
1611 r_ctl = FC_RCTL_DD_CMD_STATUS;
1613 offset = fsp->xfer_contig_end;
1614 r_ctl = FC_RCTL_DD_SOL_DATA;
1616 fc_fcp_srr(fsp, r_ctl, offset);
1617 } else if (e_stat & ESB_ST_SEQ_INIT) {
1619 * The remote port has the initiative, so just
1620 * keep waiting for it to complete.
1622 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1626 * The exchange is incomplete, we have seq. initiative.
1627 * Lost response with requested confirmation,
1628 * lost confirmation, lost transfer ready or
1631 * For output, if not all data was received, ask
1632 * for transfer ready to be repeated.
1634 * If we received or sent all the data, send SRR to
1637 * If we lost a response, we may have lost some read
1640 r_ctl = FC_RCTL_DD_SOL_DATA;
1641 if (data_dir == DMA_TO_DEVICE) {
1642 r_ctl = FC_RCTL_DD_CMD_STATUS;
1643 if (offset < fsp->data_len)
1644 r_ctl = FC_RCTL_DD_DATA_DESC;
1645 } else if (offset == fsp->xfer_contig_end) {
1646 r_ctl = FC_RCTL_DD_CMD_STATUS;
1647 } else if (fsp->xfer_contig_end < offset) {
1648 offset = fsp->xfer_contig_end;
1650 fc_fcp_srr(fsp, r_ctl, offset);
1654 fc_fcp_unlock_pkt(fsp);
1656 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1661 * fc_fcp_rec_error() - Handler for REC errors
1662 * @fsp: The FCP packet the error is on
1663 * @fp: The REC frame
1665 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1667 int error = PTR_ERR(fp);
1669 if (fc_fcp_lock_pkt(fsp))
1674 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n",
1675 fsp, fsp->rport->port_id);
1676 fc_fcp_retry_cmd(fsp, FC_ERROR);
1680 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1681 fsp, fsp->rport->port_id, error);
1682 fsp->status_code = FC_CMD_PLOGO;
1685 case -FC_EX_TIMEOUT:
1687 * Assume REC or LS_ACC was lost.
1688 * The exchange manager will have aborted REC, so retry.
1690 FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n",
1691 fsp, fsp->rport->port_id, fsp->recov_retry,
1692 FC_MAX_RECOV_RETRY);
1693 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1696 fc_fcp_recovery(fsp, FC_ERROR);
1699 fc_fcp_unlock_pkt(fsp);
1701 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1705 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1706 * @fsp: The FCP pkt that needs to be aborted
1708 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1710 FC_FCP_DBG(fsp, "start recovery code %x\n", code);
1711 fsp->status_code = code;
1712 fsp->cdb_status = 0;
1715 * if this fails then we let the scsi command timer fire and
1718 fc_fcp_send_abort(fsp);
1722 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1723 * @fsp: The FCP packet the SRR is to be sent on
1724 * @r_ctl: The R_CTL field for the SRR request
1725 * This is called after receiving status but insufficient data, or
1726 * when expecting status but the request has timed out.
1728 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1730 struct fc_lport *lport = fsp->lp;
1731 struct fc_rport *rport;
1732 struct fc_rport_libfc_priv *rpriv;
1733 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1735 struct fcp_srr *srr;
1736 struct fc_frame *fp;
1739 rpriv = rport->dd_data;
1741 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1742 rpriv->rp_state != RPORT_ST_READY)
1743 goto retry; /* shouldn't happen */
1744 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1748 srr = fc_frame_payload_get(fp, sizeof(*srr));
1749 memset(srr, 0, sizeof(*srr));
1750 srr->srr_op = ELS_SRR;
1751 srr->srr_ox_id = htons(ep->oxid);
1752 srr->srr_rx_id = htons(ep->rxid);
1753 srr->srr_r_ctl = r_ctl;
1754 srr->srr_rel_off = htonl(offset);
1756 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1757 rpriv->local_port->port_id, FC_TYPE_FCP,
1760 seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp,
1762 fsp, get_fsp_rec_tov(fsp));
1766 fsp->recov_seq = seq;
1767 fsp->xfer_len = offset;
1768 fsp->xfer_contig_end = offset;
1769 fsp->state &= ~FC_SRB_RCV_STATUS;
1770 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1773 fc_fcp_retry_cmd(fsp, FC_TRANS_RESET);
1777 * fc_fcp_srr_resp() - Handler for SRR response
1778 * @seq: The sequence the SRR is on
1779 * @fp: The SRR frame
1780 * @arg: The FCP packet the SRR is on
1782 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1784 struct fc_fcp_pkt *fsp = arg;
1785 struct fc_frame_header *fh;
1788 fc_fcp_srr_error(fsp, fp);
1792 if (fc_fcp_lock_pkt(fsp))
1795 fh = fc_frame_header_get(fp);
1797 * BUG? fc_fcp_srr_error calls fc_exch_done which would release
1798 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1799 * then fc_exch_timeout would be sending an abort. The fc_exch_done
1800 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1801 * an abort response though.
1803 if (fh->fh_type == FC_TYPE_BLS) {
1804 fc_fcp_unlock_pkt(fsp);
1808 switch (fc_frame_payload_op(fp)) {
1810 fsp->recov_retry = 0;
1811 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1815 fc_fcp_recovery(fsp, FC_ERROR);
1818 fc_fcp_unlock_pkt(fsp);
1825 * fc_fcp_srr_error() - Handler for SRR errors
1826 * @fsp: The FCP packet that the SRR error is on
1827 * @fp: The SRR frame
1829 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1831 if (fc_fcp_lock_pkt(fsp))
1833 switch (PTR_ERR(fp)) {
1834 case -FC_EX_TIMEOUT:
1835 FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry);
1836 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1839 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1841 case -FC_EX_CLOSED: /* e.g., link failure */
1842 FC_FCP_DBG(fsp, "SRR error, exchange closed\n");
1845 fc_fcp_retry_cmd(fsp, FC_ERROR);
1848 fc_fcp_unlock_pkt(fsp);
1850 fc_exch_done(fsp->recov_seq);
1854 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1855 * @lport: The local port to be checked
1857 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1860 return (lport->state == LPORT_ST_READY) &&
1861 lport->link_up && !lport->qfull;
1865 * fc_queuecommand() - The queuecommand function of the SCSI template
1866 * @shost: The Scsi_Host that the command was issued to
1867 * @cmd: The scsi_cmnd to be executed
1869 * This is the i/o strategy routine, called by the SCSI layer.
1871 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1873 struct fc_lport *lport = shost_priv(shost);
1874 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1875 struct fc_fcp_pkt *fsp;
1876 struct fc_rport_libfc_priv *rpriv;
1879 struct fc_stats *stats;
1881 rval = fc_remote_port_chkready(rport);
1883 sc_cmd->result = rval;
1884 sc_cmd->scsi_done(sc_cmd);
1888 if (!*(struct fc_remote_port **)rport->dd_data) {
1890 * rport is transitioning from blocked/deleted to
1893 sc_cmd->result = DID_IMM_RETRY << 16;
1894 sc_cmd->scsi_done(sc_cmd);
1898 rpriv = rport->dd_data;
1900 if (!fc_fcp_lport_queue_ready(lport)) {
1902 if (fc_fcp_can_queue_ramp_down(lport))
1903 shost_printk(KERN_ERR, lport->host,
1904 "libfc: queue full, "
1905 "reducing can_queue to %d.\n",
1906 lport->host->can_queue);
1908 rc = SCSI_MLQUEUE_HOST_BUSY;
1912 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1914 rc = SCSI_MLQUEUE_HOST_BUSY;
1919 * build the libfc request pkt
1921 fsp->cmd = sc_cmd; /* save the cmd */
1922 fsp->rport = rport; /* set the remote port ptr */
1925 * set up the transfer length
1927 fsp->data_len = scsi_bufflen(sc_cmd);
1931 * setup the data direction
1933 stats = per_cpu_ptr(lport->stats, get_cpu());
1934 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1935 fsp->req_flags = FC_SRB_READ;
1936 stats->InputRequests++;
1937 stats->InputBytes += fsp->data_len;
1938 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1939 fsp->req_flags = FC_SRB_WRITE;
1940 stats->OutputRequests++;
1941 stats->OutputBytes += fsp->data_len;
1944 stats->ControlRequests++;
1949 * send it to the lower layer
1950 * if we get -1 return then put the request in the pending
1953 rval = fc_fcp_pkt_send(lport, fsp);
1955 fsp->state = FC_SRB_FREE;
1956 fc_fcp_pkt_release(fsp);
1957 rc = SCSI_MLQUEUE_HOST_BUSY;
1962 EXPORT_SYMBOL(fc_queuecommand);
1965 * fc_io_compl() - Handle responses for completed commands
1966 * @fsp: The FCP packet that is complete
1968 * Translates fcp_pkt errors to a Linux SCSI errors.
1969 * The fcp packet lock must be held when calling.
1971 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1973 struct fc_fcp_internal *si;
1974 struct scsi_cmnd *sc_cmd;
1975 struct fc_lport *lport;
1976 unsigned long flags;
1978 /* release outstanding ddp context */
1979 fc_fcp_ddp_done(fsp);
1981 fsp->state |= FC_SRB_COMPL;
1982 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1983 spin_unlock_bh(&fsp->scsi_pkt_lock);
1984 del_timer_sync(&fsp->timer);
1985 spin_lock_bh(&fsp->scsi_pkt_lock);
1989 si = fc_get_scsi_internal(lport);
1992 * if can_queue ramp down is done then try can_queue ramp up
1993 * since commands are completing now.
1995 if (si->last_can_queue_ramp_down_time)
1996 fc_fcp_can_queue_ramp_up(lport);
1999 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
2000 switch (fsp->status_code) {
2002 if (fsp->cdb_status == 0) {
2006 sc_cmd->result = DID_OK << 16;
2007 if (fsp->scsi_resid)
2008 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
2011 * transport level I/O was ok but scsi
2012 * has non zero status
2014 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
2018 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2019 "due to FC_ERROR\n");
2020 sc_cmd->result = DID_ERROR << 16;
2022 case FC_DATA_UNDRUN:
2023 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
2025 * scsi status is good but transport level
2028 if (fsp->state & FC_SRB_RCV_STATUS) {
2029 sc_cmd->result = DID_OK << 16;
2031 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
2032 " due to FC_DATA_UNDRUN (trans)\n");
2033 sc_cmd->result = DID_ERROR << 16;
2037 * scsi got underrun, this is an error
2039 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2040 "due to FC_DATA_UNDRUN (scsi)\n");
2041 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
2042 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
2045 case FC_DATA_OVRRUN:
2047 * overrun is an error
2049 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2050 "due to FC_DATA_OVRRUN\n");
2051 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
2053 case FC_CMD_ABORTED:
2054 if (host_byte(sc_cmd->result) == DID_TIME_OUT)
2055 FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml "
2056 "due to FC_CMD_ABORTED\n");
2058 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2059 "due to FC_CMD_ABORTED\n");
2060 set_host_byte(sc_cmd, DID_ERROR);
2062 sc_cmd->result |= fsp->io_status;
2065 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
2066 "due to FC_CMD_RESET\n");
2067 sc_cmd->result = (DID_RESET << 16);
2069 case FC_TRANS_RESET:
2070 FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml "
2071 "due to FC_TRANS_RESET\n");
2072 sc_cmd->result = (DID_SOFT_ERROR << 16);
2075 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
2076 "due to FC_HRD_ERROR\n");
2077 sc_cmd->result = (DID_NO_CONNECT << 16);
2080 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
2081 "due to FC_CRC_ERROR\n");
2082 sc_cmd->result = (DID_PARITY << 16);
2085 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
2086 "due to FC_TIMED_OUT\n");
2087 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
2090 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2091 "due to unknown error\n");
2092 sc_cmd->result = (DID_ERROR << 16);
2096 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
2097 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
2099 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2100 list_del(&fsp->list);
2101 sc_cmd->SCp.ptr = NULL;
2102 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2103 sc_cmd->scsi_done(sc_cmd);
2105 /* release ref from initial allocation in queue command */
2106 fc_fcp_pkt_release(fsp);
2110 * fc_eh_abort() - Abort a command
2111 * @sc_cmd: The SCSI command to abort
2113 * From SCSI host template.
2114 * Send an ABTS to the target device and wait for the response.
2116 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2118 struct fc_fcp_pkt *fsp;
2119 struct fc_lport *lport;
2120 struct fc_fcp_internal *si;
2122 unsigned long flags;
2125 rval = fc_block_scsi_eh(sc_cmd);
2129 lport = shost_priv(sc_cmd->device->host);
2130 if (lport->state != LPORT_ST_READY)
2132 else if (!lport->link_up)
2135 si = fc_get_scsi_internal(lport);
2136 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2137 fsp = CMD_SP(sc_cmd);
2139 /* command completed while scsi eh was setting up */
2140 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2143 /* grab a ref so the fsp and sc_cmd cannot be released from under us */
2144 fc_fcp_pkt_hold(fsp);
2145 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2147 if (fc_fcp_lock_pkt(fsp)) {
2148 /* completed while we were waiting for timer to be deleted */
2153 rc = fc_fcp_pkt_abort(fsp);
2154 fc_fcp_unlock_pkt(fsp);
2157 fc_fcp_pkt_release(fsp);
2160 EXPORT_SYMBOL(fc_eh_abort);
2163 * fc_eh_device_reset() - Reset a single LUN
2164 * @sc_cmd: The SCSI command which identifies the device whose
2165 * LUN is to be reset
2167 * Set from SCSI host template.
2169 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2171 struct fc_lport *lport;
2172 struct fc_fcp_pkt *fsp;
2173 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2177 rval = fc_block_scsi_eh(sc_cmd);
2181 lport = shost_priv(sc_cmd->device->host);
2183 if (lport->state != LPORT_ST_READY)
2186 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2188 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2190 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2195 * Build the libfc request pkt. Do not set the scsi cmnd, because
2196 * the sc passed in is not setup for execution like when sent
2197 * through the queuecommand callout.
2199 fsp->rport = rport; /* set the remote port ptr */
2202 * flush outstanding commands
2204 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2205 fsp->state = FC_SRB_FREE;
2206 fc_fcp_pkt_release(fsp);
2211 EXPORT_SYMBOL(fc_eh_device_reset);
2214 * fc_eh_host_reset() - Reset a Scsi_Host.
2215 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2217 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2219 struct Scsi_Host *shost = sc_cmd->device->host;
2220 struct fc_lport *lport = shost_priv(shost);
2221 unsigned long wait_tmo;
2223 FC_SCSI_DBG(lport, "Resetting host\n");
2225 fc_lport_reset(lport);
2226 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2227 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2231 if (fc_fcp_lport_queue_ready(lport)) {
2232 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2233 "on port (%6.6x)\n", lport->port_id);
2236 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2237 "port (%6.6x) is not ready.\n",
2242 EXPORT_SYMBOL(fc_eh_host_reset);
2245 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2246 * @sdev: The SCSI device that identifies the SCSI host
2248 * Configures queue depth based on host's cmd_per_len. If not set
2249 * then we use the libfc default.
2251 int fc_slave_alloc(struct scsi_device *sdev)
2253 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2255 if (!rport || fc_remote_port_chkready(rport))
2258 scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2261 EXPORT_SYMBOL(fc_slave_alloc);
2264 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2265 * @lport: The local port that no longer needs the FCP layer
2267 void fc_fcp_destroy(struct fc_lport *lport)
2269 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2271 if (!list_empty(&si->scsi_pkt_queue))
2272 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2273 "port (%6.6x)\n", lport->port_id);
2275 mempool_destroy(si->scsi_pkt_pool);
2277 lport->scsi_priv = NULL;
2279 EXPORT_SYMBOL(fc_fcp_destroy);
2281 int fc_setup_fcp(void)
2285 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2286 sizeof(struct fc_fcp_pkt),
2287 0, SLAB_HWCACHE_ALIGN, NULL);
2288 if (!scsi_pkt_cachep) {
2289 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2290 "module load failed!");
2297 void fc_destroy_fcp(void)
2299 if (scsi_pkt_cachep)
2300 kmem_cache_destroy(scsi_pkt_cachep);
2304 * fc_fcp_init() - Initialize the FCP layer for a local port
2305 * @lport: The local port to initialize the exchange layer for
2307 int fc_fcp_init(struct fc_lport *lport)
2310 struct fc_fcp_internal *si;
2312 if (!lport->tt.fcp_cmd_send)
2313 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2315 if (!lport->tt.fcp_cleanup)
2316 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2318 if (!lport->tt.fcp_abort_io)
2319 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2321 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2324 lport->scsi_priv = si;
2325 si->max_can_queue = lport->host->can_queue;
2326 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2327 spin_lock_init(&si->scsi_queue_lock);
2329 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2330 if (!si->scsi_pkt_pool) {
2340 EXPORT_SYMBOL(fc_fcp_init);