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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / libfc / fc_fcp.c
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1/*
2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Maintained at www.Open-FCoE.org
20 */
21
22#include <linux/module.h>
23#include <linux/delay.h>
24#include <linux/kernel.h>
25#include <linux/types.h>
26#include <linux/spinlock.h>
27#include <linux/scatterlist.h>
28#include <linux/err.h>
29#include <linux/crc32.h>
30#include <linux/slab.h>
31
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>
37
38#include <scsi/fc/fc_fc2.h>
39
40#include <scsi/libfc.h>
41#include <scsi/fc_encode.h>
42
43#include "fc_libfc.h"
44
45static struct kmem_cache *scsi_pkt_cachep;
46
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 */
56
57#define FC_SRB_READ (1 << 1)
58#define FC_SRB_WRITE (1 << 0)
59
60/*
61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
62 */
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)
68
69/**
70 * struct fc_fcp_internal - FCP layer internal data
71 * @scsi_pkt_pool: Memory pool to draw FCP packets from
72 * @scsi_queue_lock: Protects the scsi_pkt_queue
73 * @scsi_pkt_queue: Current FCP packets
74 * @last_can_queue_ramp_down_time: ramp down time
75 * @last_can_queue_ramp_up_time: ramp up time
76 * @max_can_queue: max can_queue size
77 */
78struct fc_fcp_internal {
79 mempool_t *scsi_pkt_pool;
80 spinlock_t scsi_queue_lock;
81 struct list_head scsi_pkt_queue;
82 unsigned long last_can_queue_ramp_down_time;
83 unsigned long last_can_queue_ramp_up_time;
84 int max_can_queue;
85};
86
87#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
88
89/*
90 * function prototypes
91 * FC scsi I/O related functions
92 */
93static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
94static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
95static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
96static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
97static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
98static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
99static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
100static void fc_fcp_timeout(unsigned long);
101static void fc_fcp_rec(struct fc_fcp_pkt *);
102static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
103static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
104static void fc_io_compl(struct fc_fcp_pkt *);
105
106static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
107static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
108static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
109
110/*
111 * command status codes
112 */
113#define FC_COMPLETE 0
114#define FC_CMD_ABORTED 1
115#define FC_CMD_RESET 2
116#define FC_CMD_PLOGO 3
117#define FC_SNS_RCV 4
118#define FC_TRANS_ERR 5
119#define FC_DATA_OVRRUN 6
120#define FC_DATA_UNDRUN 7
121#define FC_ERROR 8
122#define FC_HRD_ERROR 9
123#define FC_CRC_ERROR 10
124#define FC_TIMED_OUT 11
125
126/*
127 * Error recovery timeout values.
128 */
129#define FC_SCSI_TM_TOV (10 * HZ)
130#define FC_HOST_RESET_TIMEOUT (30 * HZ)
131#define FC_CAN_QUEUE_PERIOD (60 * HZ)
132
133#define FC_MAX_ERROR_CNT 5
134#define FC_MAX_RECOV_RETRY 3
135
136#define FC_FCP_DFLT_QUEUE_DEPTH 32
137
138/**
139 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
140 * @lport: The local port that the FCP packet is for
141 * @gfp: GFP flags for allocation
142 *
143 * Return value: fcp_pkt structure or null on allocation failure.
144 * Context: Can be called from process context, no lock is required.
145 */
146static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
147{
148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
149 struct fc_fcp_pkt *fsp;
150
151 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
152 if (fsp) {
153 memset(fsp, 0, sizeof(*fsp));
154 fsp->lp = lport;
155 fsp->xfer_ddp = FC_XID_UNKNOWN;
156 atomic_set(&fsp->ref_cnt, 1);
157 init_timer(&fsp->timer);
158 fsp->timer.data = (unsigned long)fsp;
159 INIT_LIST_HEAD(&fsp->list);
160 spin_lock_init(&fsp->scsi_pkt_lock);
161 } else {
162 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++;
163 put_cpu();
164 }
165 return fsp;
166}
167
168/**
169 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
170 * @fsp: The FCP packet to be released
171 *
172 * Context: Can be called from process or interrupt context,
173 * no lock is required.
174 */
175static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
176{
177 if (atomic_dec_and_test(&fsp->ref_cnt)) {
178 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
179
180 mempool_free(fsp, si->scsi_pkt_pool);
181 }
182}
183
184/**
185 * fc_fcp_pkt_hold() - Hold a fcp_pkt
186 * @fsp: The FCP packet to be held
187 */
188static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
189{
190 atomic_inc(&fsp->ref_cnt);
191}
192
193/**
194 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
195 * @seq: The sequence that the FCP packet is on (required by destructor API)
196 * @fsp: The FCP packet to be released
197 *
198 * This routine is called by a destructor callback in the exch_seq_send()
199 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
200 * argument even though it is not used by this routine.
201 *
202 * Context: No locking required.
203 */
204static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
205{
206 fc_fcp_pkt_release(fsp);
207}
208
209/**
210 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
211 * @fsp: The FCP packet to be locked and incremented
212 *
213 * We should only return error if we return a command to SCSI-ml before
214 * getting a response. This can happen in cases where we send a abort, but
215 * do not wait for the response and the abort and command can be passing
216 * each other on the wire/network-layer.
217 *
218 * Note: this function locks the packet and gets a reference to allow
219 * callers to call the completion function while the lock is held and
220 * not have to worry about the packets refcount.
221 *
222 * TODO: Maybe we should just have callers grab/release the lock and
223 * have a function that they call to verify the fsp and grab a ref if
224 * needed.
225 */
226static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
227{
228 spin_lock_bh(&fsp->scsi_pkt_lock);
229 if (fsp->state & FC_SRB_COMPL) {
230 spin_unlock_bh(&fsp->scsi_pkt_lock);
231 return -EPERM;
232 }
233
234 fc_fcp_pkt_hold(fsp);
235 return 0;
236}
237
238/**
239 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
240 * reference count
241 * @fsp: The FCP packet to be unlocked and decremented
242 */
243static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
244{
245 spin_unlock_bh(&fsp->scsi_pkt_lock);
246 fc_fcp_pkt_release(fsp);
247}
248
249/**
250 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
251 * @fsp: The FCP packet to start a timer for
252 * @delay: The timeout period in jiffies
253 */
254static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
255{
256 if (!(fsp->state & FC_SRB_COMPL))
257 mod_timer(&fsp->timer, jiffies + delay);
258}
259
260/**
261 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
262 * fcp_pkt
263 * @fsp: The FCP packet to abort exchanges on
264 */
265static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
266{
267 if (!fsp->seq_ptr)
268 return -EINVAL;
269
270 per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++;
271 put_cpu();
272
273 fsp->state |= FC_SRB_ABORT_PENDING;
274 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
275}
276
277/**
278 * fc_fcp_retry_cmd() - Retry a fcp_pkt
279 * @fsp: The FCP packet to be retried
280 *
281 * Sets the status code to be FC_ERROR and then calls
282 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
283 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
284 * The SCSI-ml will retry the command.
285 */
286static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
287{
288 if (fsp->seq_ptr) {
289 fsp->lp->tt.exch_done(fsp->seq_ptr);
290 fsp->seq_ptr = NULL;
291 }
292
293 fsp->state &= ~FC_SRB_ABORT_PENDING;
294 fsp->io_status = 0;
295 fsp->status_code = FC_ERROR;
296 fc_fcp_complete_locked(fsp);
297}
298
299/**
300 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
301 * @fsp: The FCP packet that will manage the DDP frames
302 * @xid: The XID that will be used for the DDP exchange
303 */
304void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
305{
306 struct fc_lport *lport;
307
308 lport = fsp->lp;
309 if ((fsp->req_flags & FC_SRB_READ) &&
310 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
311 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
312 scsi_sg_count(fsp->cmd)))
313 fsp->xfer_ddp = xid;
314 }
315}
316
317/**
318 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
319 * DDP related resources for a fcp_pkt
320 * @fsp: The FCP packet that DDP had been used on
321 */
322void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
323{
324 struct fc_lport *lport;
325
326 if (!fsp)
327 return;
328
329 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
330 return;
331
332 lport = fsp->lp;
333 if (lport->tt.ddp_done) {
334 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
335 fsp->xfer_ddp = FC_XID_UNKNOWN;
336 }
337}
338
339/**
340 * fc_fcp_can_queue_ramp_up() - increases can_queue
341 * @lport: lport to ramp up can_queue
342 */
343static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
344{
345 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
346 unsigned long flags;
347 int can_queue;
348
349 spin_lock_irqsave(lport->host->host_lock, flags);
350
351 if (si->last_can_queue_ramp_up_time &&
352 (time_before(jiffies, si->last_can_queue_ramp_up_time +
353 FC_CAN_QUEUE_PERIOD)))
354 goto unlock;
355
356 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
357 FC_CAN_QUEUE_PERIOD))
358 goto unlock;
359
360 si->last_can_queue_ramp_up_time = jiffies;
361
362 can_queue = lport->host->can_queue << 1;
363 if (can_queue >= si->max_can_queue) {
364 can_queue = si->max_can_queue;
365 si->last_can_queue_ramp_down_time = 0;
366 }
367 lport->host->can_queue = can_queue;
368 shost_printk(KERN_ERR, lport->host, "libfc: increased "
369 "can_queue to %d.\n", can_queue);
370
371unlock:
372 spin_unlock_irqrestore(lport->host->host_lock, flags);
373}
374
375/**
376 * fc_fcp_can_queue_ramp_down() - reduces can_queue
377 * @lport: lport to reduce can_queue
378 *
379 * If we are getting memory allocation failures, then we may
380 * be trying to execute too many commands. We let the running
381 * commands complete or timeout, then try again with a reduced
382 * can_queue. Eventually we will hit the point where we run
383 * on all reserved structs.
384 */
385static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
386{
387 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
388 unsigned long flags;
389 int can_queue;
390
391 spin_lock_irqsave(lport->host->host_lock, flags);
392
393 if (si->last_can_queue_ramp_down_time &&
394 (time_before(jiffies, si->last_can_queue_ramp_down_time +
395 FC_CAN_QUEUE_PERIOD)))
396 goto unlock;
397
398 si->last_can_queue_ramp_down_time = jiffies;
399
400 can_queue = lport->host->can_queue;
401 can_queue >>= 1;
402 if (!can_queue)
403 can_queue = 1;
404 lport->host->can_queue = can_queue;
405 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
406 "Reducing can_queue to %d.\n", can_queue);
407
408unlock:
409 spin_unlock_irqrestore(lport->host->host_lock, flags);
410}
411
412/*
413 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
414 * @lport: fc lport struct
415 * @len: payload length
416 *
417 * Allocates fc_frame structure and buffer but if fails to allocate
418 * then reduce can_queue.
419 */
420static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
421 size_t len)
422{
423 struct fc_frame *fp;
424
425 fp = fc_frame_alloc(lport, len);
426 if (likely(fp))
427 return fp;
428
429 per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++;
430 put_cpu();
431 /* error case */
432 fc_fcp_can_queue_ramp_down(lport);
433 return NULL;
434}
435
436/**
437 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
438 * @fsp: The FCP packet the data is on
439 * @fp: The data frame
440 */
441static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
442{
443 struct scsi_cmnd *sc = fsp->cmd;
444 struct fc_lport *lport = fsp->lp;
445 struct fc_stats *stats;
446 struct fc_frame_header *fh;
447 size_t start_offset;
448 size_t offset;
449 u32 crc;
450 u32 copy_len = 0;
451 size_t len;
452 void *buf;
453 struct scatterlist *sg;
454 u32 nents;
455 u8 host_bcode = FC_COMPLETE;
456
457 fh = fc_frame_header_get(fp);
458 offset = ntohl(fh->fh_parm_offset);
459 start_offset = offset;
460 len = fr_len(fp) - sizeof(*fh);
461 buf = fc_frame_payload_get(fp, 0);
462
463 /*
464 * if this I/O is ddped then clear it and initiate recovery since data
465 * frames are expected to be placed directly in that case.
466 *
467 * Indicate error to scsi-ml because something went wrong with the
468 * ddp handling to get us here.
469 */
470 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
471 fc_fcp_ddp_done(fsp);
472 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
473 host_bcode = FC_ERROR;
474 goto err;
475 }
476 if (offset + len > fsp->data_len) {
477 /* this should never happen */
478 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
479 fc_frame_crc_check(fp))
480 goto crc_err;
481 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
482 "data_len %x\n", len, offset, fsp->data_len);
483
484 /* Data is corrupted indicate scsi-ml should retry */
485 host_bcode = FC_DATA_OVRRUN;
486 goto err;
487 }
488 if (offset != fsp->xfer_len)
489 fsp->state |= FC_SRB_DISCONTIG;
490
491 sg = scsi_sglist(sc);
492 nents = scsi_sg_count(sc);
493
494 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
495 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
496 &offset, NULL);
497 } else {
498 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
499 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
500 &offset, &crc);
501 buf = fc_frame_payload_get(fp, 0);
502 if (len % 4)
503 crc = crc32(crc, buf + len, 4 - (len % 4));
504
505 if (~crc != le32_to_cpu(fr_crc(fp))) {
506crc_err:
507 stats = per_cpu_ptr(lport->stats, get_cpu());
508 stats->ErrorFrames++;
509 /* per cpu count, not total count, but OK for limit */
510 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
511 printk(KERN_WARNING "libfc: CRC error on data "
512 "frame for port (%6.6x)\n",
513 lport->port_id);
514 put_cpu();
515 /*
516 * Assume the frame is total garbage.
517 * We may have copied it over the good part
518 * of the buffer.
519 * If so, we need to retry the entire operation.
520 * Otherwise, ignore it.
521 */
522 if (fsp->state & FC_SRB_DISCONTIG) {
523 host_bcode = FC_CRC_ERROR;
524 goto err;
525 }
526 return;
527 }
528 }
529
530 if (fsp->xfer_contig_end == start_offset)
531 fsp->xfer_contig_end += copy_len;
532 fsp->xfer_len += copy_len;
533
534 /*
535 * In the very rare event that this data arrived after the response
536 * and completes the transfer, call the completion handler.
537 */
538 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
539 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
540 fc_fcp_complete_locked(fsp);
541 return;
542err:
543 fc_fcp_recovery(fsp, host_bcode);
544}
545
546/**
547 * fc_fcp_send_data() - Send SCSI data to a target
548 * @fsp: The FCP packet the data is on
549 * @sp: The sequence the data is to be sent on
550 * @offset: The starting offset for this data request
551 * @seq_blen: The burst length for this data request
552 *
553 * Called after receiving a Transfer Ready data descriptor.
554 * If the LLD is capable of sequence offload then send down the
555 * seq_blen amount of data in single frame, otherwise send
556 * multiple frames of the maximum frame payload supported by
557 * the target port.
558 */
559static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
560 size_t offset, size_t seq_blen)
561{
562 struct fc_exch *ep;
563 struct scsi_cmnd *sc;
564 struct scatterlist *sg;
565 struct fc_frame *fp = NULL;
566 struct fc_lport *lport = fsp->lp;
567 struct page *page;
568 size_t remaining;
569 size_t t_blen;
570 size_t tlen;
571 size_t sg_bytes;
572 size_t frame_offset, fh_parm_offset;
573 size_t off;
574 int error;
575 void *data = NULL;
576 void *page_addr;
577 int using_sg = lport->sg_supp;
578 u32 f_ctl;
579
580 WARN_ON(seq_blen <= 0);
581 if (unlikely(offset + seq_blen > fsp->data_len)) {
582 /* this should never happen */
583 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
584 "offset %zx\n", seq_blen, offset);
585 fc_fcp_send_abort(fsp);
586 return 0;
587 } else if (offset != fsp->xfer_len) {
588 /* Out of Order Data Request - no problem, but unexpected. */
589 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
590 "seq_blen %zx offset %zx\n", seq_blen, offset);
591 }
592
593 /*
594 * if LLD is capable of seq_offload then set transport
595 * burst length (t_blen) to seq_blen, otherwise set t_blen
596 * to max FC frame payload previously set in fsp->max_payload.
597 */
598 t_blen = fsp->max_payload;
599 if (lport->seq_offload) {
600 t_blen = min(seq_blen, (size_t)lport->lso_max);
601 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
602 fsp, seq_blen, lport->lso_max, t_blen);
603 }
604
605 if (t_blen > 512)
606 t_blen &= ~(512 - 1); /* round down to block size */
607 sc = fsp->cmd;
608
609 remaining = seq_blen;
610 fh_parm_offset = frame_offset = offset;
611 tlen = 0;
612 seq = lport->tt.seq_start_next(seq);
613 f_ctl = FC_FC_REL_OFF;
614 WARN_ON(!seq);
615
616 sg = scsi_sglist(sc);
617
618 while (remaining > 0 && sg) {
619 if (offset >= sg->length) {
620 offset -= sg->length;
621 sg = sg_next(sg);
622 continue;
623 }
624 if (!fp) {
625 tlen = min(t_blen, remaining);
626
627 /*
628 * TODO. Temporary workaround. fc_seq_send() can't
629 * handle odd lengths in non-linear skbs.
630 * This will be the final fragment only.
631 */
632 if (tlen % 4)
633 using_sg = 0;
634 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
635 if (!fp)
636 return -ENOMEM;
637
638 data = fc_frame_header_get(fp) + 1;
639 fh_parm_offset = frame_offset;
640 fr_max_payload(fp) = fsp->max_payload;
641 }
642
643 off = offset + sg->offset;
644 sg_bytes = min(tlen, sg->length - offset);
645 sg_bytes = min(sg_bytes,
646 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
647 page = sg_page(sg) + (off >> PAGE_SHIFT);
648 if (using_sg) {
649 get_page(page);
650 skb_fill_page_desc(fp_skb(fp),
651 skb_shinfo(fp_skb(fp))->nr_frags,
652 page, off & ~PAGE_MASK, sg_bytes);
653 fp_skb(fp)->data_len += sg_bytes;
654 fr_len(fp) += sg_bytes;
655 fp_skb(fp)->truesize += PAGE_SIZE;
656 } else {
657 /*
658 * The scatterlist item may be bigger than PAGE_SIZE,
659 * but we must not cross pages inside the kmap.
660 */
661 page_addr = kmap_atomic(page);
662 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
663 sg_bytes);
664 kunmap_atomic(page_addr);
665 data += sg_bytes;
666 }
667 offset += sg_bytes;
668 frame_offset += sg_bytes;
669 tlen -= sg_bytes;
670 remaining -= sg_bytes;
671
672 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
673 (tlen))
674 continue;
675
676 /*
677 * Send sequence with transfer sequence initiative in case
678 * this is last FCP frame of the sequence.
679 */
680 if (remaining == 0)
681 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
682
683 ep = fc_seq_exch(seq);
684 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
685 FC_TYPE_FCP, f_ctl, fh_parm_offset);
686
687 /*
688 * send fragment using for a sequence.
689 */
690 error = lport->tt.seq_send(lport, seq, fp);
691 if (error) {
692 WARN_ON(1); /* send error should be rare */
693 return error;
694 }
695 fp = NULL;
696 }
697 fsp->xfer_len += seq_blen; /* premature count? */
698 return 0;
699}
700
701/**
702 * fc_fcp_abts_resp() - Receive an ABTS response
703 * @fsp: The FCP packet that is being aborted
704 * @fp: The response frame
705 */
706static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
707{
708 int ba_done = 1;
709 struct fc_ba_rjt *brp;
710 struct fc_frame_header *fh;
711
712 fh = fc_frame_header_get(fp);
713 switch (fh->fh_r_ctl) {
714 case FC_RCTL_BA_ACC:
715 break;
716 case FC_RCTL_BA_RJT:
717 brp = fc_frame_payload_get(fp, sizeof(*brp));
718 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
719 break;
720 /* fall thru */
721 default:
722 /*
723 * we will let the command timeout
724 * and scsi-ml recover in this case,
725 * therefore cleared the ba_done flag.
726 */
727 ba_done = 0;
728 }
729
730 if (ba_done) {
731 fsp->state |= FC_SRB_ABORTED;
732 fsp->state &= ~FC_SRB_ABORT_PENDING;
733
734 if (fsp->wait_for_comp)
735 complete(&fsp->tm_done);
736 else
737 fc_fcp_complete_locked(fsp);
738 }
739}
740
741/**
742 * fc_fcp_recv() - Receive an FCP frame
743 * @seq: The sequence the frame is on
744 * @fp: The received frame
745 * @arg: The related FCP packet
746 *
747 * Context: Called from Soft IRQ context. Can not be called
748 * holding the FCP packet list lock.
749 */
750static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
751{
752 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
753 struct fc_lport *lport = fsp->lp;
754 struct fc_frame_header *fh;
755 struct fcp_txrdy *dd;
756 u8 r_ctl;
757 int rc = 0;
758
759 if (IS_ERR(fp)) {
760 fc_fcp_error(fsp, fp);
761 return;
762 }
763
764 fh = fc_frame_header_get(fp);
765 r_ctl = fh->fh_r_ctl;
766
767 if (lport->state != LPORT_ST_READY)
768 goto out;
769 if (fc_fcp_lock_pkt(fsp))
770 goto out;
771
772 if (fh->fh_type == FC_TYPE_BLS) {
773 fc_fcp_abts_resp(fsp, fp);
774 goto unlock;
775 }
776
777 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
778 goto unlock;
779
780 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
781 /*
782 * received XFER RDY from the target
783 * need to send data to the target
784 */
785 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
786 dd = fc_frame_payload_get(fp, sizeof(*dd));
787 WARN_ON(!dd);
788
789 rc = fc_fcp_send_data(fsp, seq,
790 (size_t) ntohl(dd->ft_data_ro),
791 (size_t) ntohl(dd->ft_burst_len));
792 if (!rc)
793 seq->rec_data = fsp->xfer_len;
794 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
795 /*
796 * received a DATA frame
797 * next we will copy the data to the system buffer
798 */
799 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
800 fc_fcp_recv_data(fsp, fp);
801 seq->rec_data = fsp->xfer_contig_end;
802 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
803 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
804
805 fc_fcp_resp(fsp, fp);
806 } else {
807 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
808 }
809unlock:
810 fc_fcp_unlock_pkt(fsp);
811out:
812 fc_frame_free(fp);
813}
814
815/**
816 * fc_fcp_resp() - Handler for FCP responses
817 * @fsp: The FCP packet the response is for
818 * @fp: The response frame
819 */
820static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
821{
822 struct fc_frame_header *fh;
823 struct fcp_resp *fc_rp;
824 struct fcp_resp_ext *rp_ex;
825 struct fcp_resp_rsp_info *fc_rp_info;
826 u32 plen;
827 u32 expected_len;
828 u32 respl = 0;
829 u32 snsl = 0;
830 u8 flags = 0;
831
832 plen = fr_len(fp);
833 fh = (struct fc_frame_header *)fr_hdr(fp);
834 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
835 goto len_err;
836 plen -= sizeof(*fh);
837 fc_rp = (struct fcp_resp *)(fh + 1);
838 fsp->cdb_status = fc_rp->fr_status;
839 flags = fc_rp->fr_flags;
840 fsp->scsi_comp_flags = flags;
841 expected_len = fsp->data_len;
842
843 /* if ddp, update xfer len */
844 fc_fcp_ddp_done(fsp);
845
846 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
847 rp_ex = (void *)(fc_rp + 1);
848 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
849 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
850 goto len_err;
851 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
852 if (flags & FCP_RSP_LEN_VAL) {
853 respl = ntohl(rp_ex->fr_rsp_len);
854 if ((respl != FCP_RESP_RSP_INFO_LEN4) &&
855 (respl != FCP_RESP_RSP_INFO_LEN8))
856 goto len_err;
857 if (fsp->wait_for_comp) {
858 /* Abuse cdb_status for rsp code */
859 fsp->cdb_status = fc_rp_info->rsp_code;
860 complete(&fsp->tm_done);
861 /*
862 * tmfs will not have any scsi cmd so
863 * exit here
864 */
865 return;
866 }
867 }
868 if (flags & FCP_SNS_LEN_VAL) {
869 snsl = ntohl(rp_ex->fr_sns_len);
870 if (snsl > SCSI_SENSE_BUFFERSIZE)
871 snsl = SCSI_SENSE_BUFFERSIZE;
872 memcpy(fsp->cmd->sense_buffer,
873 (char *)fc_rp_info + respl, snsl);
874 }
875 }
876 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
877 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
878 goto len_err;
879 if (flags & FCP_RESID_UNDER) {
880 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
881 /*
882 * The cmnd->underflow is the minimum number of
883 * bytes that must be transferred for this
884 * command. Provided a sense condition is not
885 * present, make sure the actual amount
886 * transferred is at least the underflow value
887 * or fail.
888 */
889 if (!(flags & FCP_SNS_LEN_VAL) &&
890 (fc_rp->fr_status == 0) &&
891 (scsi_bufflen(fsp->cmd) -
892 fsp->scsi_resid) < fsp->cmd->underflow)
893 goto err;
894 expected_len -= fsp->scsi_resid;
895 } else {
896 fsp->status_code = FC_ERROR;
897 }
898 }
899 }
900 fsp->state |= FC_SRB_RCV_STATUS;
901
902 /*
903 * Check for missing or extra data frames.
904 */
905 if (unlikely(fsp->xfer_len != expected_len)) {
906 if (fsp->xfer_len < expected_len) {
907 /*
908 * Some data may be queued locally,
909 * Wait a at least one jiffy to see if it is delivered.
910 * If this expires without data, we may do SRR.
911 */
912 fc_fcp_timer_set(fsp, 2);
913 return;
914 }
915 fsp->status_code = FC_DATA_OVRRUN;
916 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
917 "len %x, data len %x\n",
918 fsp->rport->port_id,
919 fsp->xfer_len, expected_len, fsp->data_len);
920 }
921 fc_fcp_complete_locked(fsp);
922 return;
923
924len_err:
925 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
926 "snsl %u\n", flags, fr_len(fp), respl, snsl);
927err:
928 fsp->status_code = FC_ERROR;
929 fc_fcp_complete_locked(fsp);
930}
931
932/**
933 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
934 * fcp_pkt lock held
935 * @fsp: The FCP packet to be completed
936 *
937 * This function may sleep if a timer is pending. The packet lock must be
938 * held, and the host lock must not be held.
939 */
940static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
941{
942 struct fc_lport *lport = fsp->lp;
943 struct fc_seq *seq;
944 struct fc_exch *ep;
945 u32 f_ctl;
946
947 if (fsp->state & FC_SRB_ABORT_PENDING)
948 return;
949
950 if (fsp->state & FC_SRB_ABORTED) {
951 if (!fsp->status_code)
952 fsp->status_code = FC_CMD_ABORTED;
953 } else {
954 /*
955 * Test for transport underrun, independent of response
956 * underrun status.
957 */
958 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
959 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
960 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
961 fsp->status_code = FC_DATA_UNDRUN;
962 fsp->io_status = 0;
963 }
964 }
965
966 seq = fsp->seq_ptr;
967 if (seq) {
968 fsp->seq_ptr = NULL;
969 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
970 struct fc_frame *conf_frame;
971 struct fc_seq *csp;
972
973 csp = lport->tt.seq_start_next(seq);
974 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
975 if (conf_frame) {
976 f_ctl = FC_FC_SEQ_INIT;
977 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
978 ep = fc_seq_exch(seq);
979 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
980 ep->did, ep->sid,
981 FC_TYPE_FCP, f_ctl, 0);
982 lport->tt.seq_send(lport, csp, conf_frame);
983 }
984 }
985 lport->tt.exch_done(seq);
986 }
987 /*
988 * Some resets driven by SCSI are not I/Os and do not have
989 * SCSI commands associated with the requests. We should not
990 * call I/O completion if we do not have a SCSI command.
991 */
992 if (fsp->cmd)
993 fc_io_compl(fsp);
994}
995
996/**
997 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
998 * @fsp: The FCP packet whose exchanges should be canceled
999 * @error: The reason for the cancellation
1000 */
1001static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
1002{
1003 struct fc_lport *lport = fsp->lp;
1004
1005 if (fsp->seq_ptr) {
1006 lport->tt.exch_done(fsp->seq_ptr);
1007 fsp->seq_ptr = NULL;
1008 }
1009 fsp->status_code = error;
1010}
1011
1012/**
1013 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1014 * @lport: The local port whose exchanges should be canceled
1015 * @id: The target's ID
1016 * @lun: The LUN
1017 * @error: The reason for cancellation
1018 *
1019 * If lun or id is -1, they are ignored.
1020 */
1021static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1022 unsigned int lun, int error)
1023{
1024 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1025 struct fc_fcp_pkt *fsp;
1026 struct scsi_cmnd *sc_cmd;
1027 unsigned long flags;
1028
1029 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1030restart:
1031 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1032 sc_cmd = fsp->cmd;
1033 if (id != -1 && scmd_id(sc_cmd) != id)
1034 continue;
1035
1036 if (lun != -1 && sc_cmd->device->lun != lun)
1037 continue;
1038
1039 fc_fcp_pkt_hold(fsp);
1040 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1041
1042 spin_lock_bh(&fsp->scsi_pkt_lock);
1043 if (!(fsp->state & FC_SRB_COMPL)) {
1044 fsp->state |= FC_SRB_COMPL;
1045 /*
1046 * TODO: dropping scsi_pkt_lock and then reacquiring
1047 * again around fc_fcp_cleanup_cmd() is required,
1048 * since fc_fcp_cleanup_cmd() calls into
1049 * fc_seq_set_resp() and that func preempts cpu using
1050 * schedule. May be schedule and related code should be
1051 * removed instead of unlocking here to avoid scheduling
1052 * while atomic bug.
1053 */
1054 spin_unlock_bh(&fsp->scsi_pkt_lock);
1055
1056 fc_fcp_cleanup_cmd(fsp, error);
1057
1058 spin_lock_bh(&fsp->scsi_pkt_lock);
1059 fc_io_compl(fsp);
1060 }
1061 spin_unlock_bh(&fsp->scsi_pkt_lock);
1062
1063 fc_fcp_pkt_release(fsp);
1064 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1065 /*
1066 * while we dropped the lock multiple pkts could
1067 * have been released, so we have to start over.
1068 */
1069 goto restart;
1070 }
1071 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1072}
1073
1074/**
1075 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1076 * @lport: The local port whose exchanges are to be aborted
1077 */
1078static void fc_fcp_abort_io(struct fc_lport *lport)
1079{
1080 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1081}
1082
1083/**
1084 * fc_fcp_pkt_send() - Send a fcp_pkt
1085 * @lport: The local port to send the FCP packet on
1086 * @fsp: The FCP packet to send
1087 *
1088 * Return: Zero for success and -1 for failure
1089 * Locks: Called without locks held
1090 */
1091static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1092{
1093 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1094 unsigned long flags;
1095 int rc;
1096
1097 fsp->cmd->SCp.ptr = (char *)fsp;
1098 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1099 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1100
1101 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun);
1102 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1103
1104 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1105 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1106 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1107 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1108 if (unlikely(rc)) {
1109 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1110 fsp->cmd->SCp.ptr = NULL;
1111 list_del(&fsp->list);
1112 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1113 }
1114
1115 return rc;
1116}
1117
1118/**
1119 * get_fsp_rec_tov() - Helper function to get REC_TOV
1120 * @fsp: the FCP packet
1121 *
1122 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
1123 */
1124static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
1125{
1126 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
1127
1128 return msecs_to_jiffies(rpriv->e_d_tov) + HZ;
1129}
1130
1131/**
1132 * fc_fcp_cmd_send() - Send a FCP command
1133 * @lport: The local port to send the command on
1134 * @fsp: The FCP packet the command is on
1135 * @resp: The handler for the response
1136 */
1137static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1138 void (*resp)(struct fc_seq *,
1139 struct fc_frame *fp,
1140 void *arg))
1141{
1142 struct fc_frame *fp;
1143 struct fc_seq *seq;
1144 struct fc_rport *rport;
1145 struct fc_rport_libfc_priv *rpriv;
1146 const size_t len = sizeof(fsp->cdb_cmd);
1147 int rc = 0;
1148
1149 if (fc_fcp_lock_pkt(fsp))
1150 return 0;
1151
1152 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1153 if (!fp) {
1154 rc = -1;
1155 goto unlock;
1156 }
1157
1158 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1159 fr_fsp(fp) = fsp;
1160 rport = fsp->rport;
1161 fsp->max_payload = rport->maxframe_size;
1162 rpriv = rport->dd_data;
1163
1164 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1165 rpriv->local_port->port_id, FC_TYPE_FCP,
1166 FC_FCTL_REQ, 0);
1167
1168 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1169 fsp, 0);
1170 if (!seq) {
1171 rc = -1;
1172 goto unlock;
1173 }
1174 fsp->seq_ptr = seq;
1175 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1176
1177 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1178 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1179 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1180
1181unlock:
1182 fc_fcp_unlock_pkt(fsp);
1183 return rc;
1184}
1185
1186/**
1187 * fc_fcp_error() - Handler for FCP layer errors
1188 * @fsp: The FCP packet the error is on
1189 * @fp: The frame that has errored
1190 */
1191static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1192{
1193 int error = PTR_ERR(fp);
1194
1195 if (fc_fcp_lock_pkt(fsp))
1196 return;
1197
1198 if (error == -FC_EX_CLOSED) {
1199 fc_fcp_retry_cmd(fsp);
1200 goto unlock;
1201 }
1202
1203 /*
1204 * clear abort pending, because the lower layer
1205 * decided to force completion.
1206 */
1207 fsp->state &= ~FC_SRB_ABORT_PENDING;
1208 fsp->status_code = FC_CMD_PLOGO;
1209 fc_fcp_complete_locked(fsp);
1210unlock:
1211 fc_fcp_unlock_pkt(fsp);
1212}
1213
1214/**
1215 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1216 * @fsp: The FCP packet to abort on
1217 *
1218 * Called to send an abort and then wait for abort completion
1219 */
1220static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1221{
1222 int rc = FAILED;
1223 unsigned long ticks_left;
1224
1225 if (fc_fcp_send_abort(fsp))
1226 return FAILED;
1227
1228 init_completion(&fsp->tm_done);
1229 fsp->wait_for_comp = 1;
1230
1231 spin_unlock_bh(&fsp->scsi_pkt_lock);
1232 ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1233 FC_SCSI_TM_TOV);
1234 spin_lock_bh(&fsp->scsi_pkt_lock);
1235 fsp->wait_for_comp = 0;
1236
1237 if (!ticks_left) {
1238 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1239 } else if (fsp->state & FC_SRB_ABORTED) {
1240 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1241 rc = SUCCESS;
1242 fc_fcp_complete_locked(fsp);
1243 }
1244
1245 return rc;
1246}
1247
1248/**
1249 * fc_lun_reset_send() - Send LUN reset command
1250 * @data: The FCP packet that identifies the LUN to be reset
1251 */
1252static void fc_lun_reset_send(unsigned long data)
1253{
1254 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1255 struct fc_lport *lport = fsp->lp;
1256
1257 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1258 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1259 return;
1260 if (fc_fcp_lock_pkt(fsp))
1261 return;
1262 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1263 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1264 fc_fcp_unlock_pkt(fsp);
1265 }
1266}
1267
1268/**
1269 * fc_lun_reset() - Send a LUN RESET command to a device
1270 * and wait for the reply
1271 * @lport: The local port to sent the command on
1272 * @fsp: The FCP packet that identifies the LUN to be reset
1273 * @id: The SCSI command ID
1274 * @lun: The LUN ID to be reset
1275 */
1276static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1277 unsigned int id, unsigned int lun)
1278{
1279 int rc;
1280
1281 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1282 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1283 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun);
1284
1285 fsp->wait_for_comp = 1;
1286 init_completion(&fsp->tm_done);
1287
1288 fc_lun_reset_send((unsigned long)fsp);
1289
1290 /*
1291 * wait for completion of reset
1292 * after that make sure all commands are terminated
1293 */
1294 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1295
1296 spin_lock_bh(&fsp->scsi_pkt_lock);
1297 fsp->state |= FC_SRB_COMPL;
1298 spin_unlock_bh(&fsp->scsi_pkt_lock);
1299
1300 del_timer_sync(&fsp->timer);
1301
1302 spin_lock_bh(&fsp->scsi_pkt_lock);
1303 if (fsp->seq_ptr) {
1304 lport->tt.exch_done(fsp->seq_ptr);
1305 fsp->seq_ptr = NULL;
1306 }
1307 fsp->wait_for_comp = 0;
1308 spin_unlock_bh(&fsp->scsi_pkt_lock);
1309
1310 if (!rc) {
1311 FC_SCSI_DBG(lport, "lun reset failed\n");
1312 return FAILED;
1313 }
1314
1315 /* cdb_status holds the tmf's rsp code */
1316 if (fsp->cdb_status != FCP_TMF_CMPL)
1317 return FAILED;
1318
1319 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1320 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1321 return SUCCESS;
1322}
1323
1324/**
1325 * fc_tm_done() - Task Management response handler
1326 * @seq: The sequence that the response is on
1327 * @fp: The response frame
1328 * @arg: The FCP packet the response is for
1329 */
1330static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1331{
1332 struct fc_fcp_pkt *fsp = arg;
1333 struct fc_frame_header *fh;
1334
1335 if (IS_ERR(fp)) {
1336 /*
1337 * If there is an error just let it timeout or wait
1338 * for TMF to be aborted if it timedout.
1339 *
1340 * scsi-eh will escalate for when either happens.
1341 */
1342 return;
1343 }
1344
1345 if (fc_fcp_lock_pkt(fsp))
1346 goto out;
1347
1348 /*
1349 * raced with eh timeout handler.
1350 */
1351 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1352 goto out_unlock;
1353
1354 fh = fc_frame_header_get(fp);
1355 if (fh->fh_type != FC_TYPE_BLS)
1356 fc_fcp_resp(fsp, fp);
1357 fsp->seq_ptr = NULL;
1358 fsp->lp->tt.exch_done(seq);
1359out_unlock:
1360 fc_fcp_unlock_pkt(fsp);
1361out:
1362 fc_frame_free(fp);
1363}
1364
1365/**
1366 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1367 * @lport: The local port to be cleaned up
1368 */
1369static void fc_fcp_cleanup(struct fc_lport *lport)
1370{
1371 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1372}
1373
1374/**
1375 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1376 * @data: The FCP packet that has timed out
1377 *
1378 * If REC is supported then just issue it and return. The REC exchange will
1379 * complete or time out and recovery can continue at that point. Otherwise,
1380 * if the response has been received without all the data it has been
1381 * ER_TIMEOUT since the response was received. If the response has not been
1382 * received we see if data was received recently. If it has been then we
1383 * continue waiting, otherwise, we abort the command.
1384 */
1385static void fc_fcp_timeout(unsigned long data)
1386{
1387 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1388 struct fc_rport *rport = fsp->rport;
1389 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1390
1391 if (fc_fcp_lock_pkt(fsp))
1392 return;
1393
1394 if (fsp->cdb_cmd.fc_tm_flags)
1395 goto unlock;
1396
1397 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1398
1399 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1400 fc_fcp_rec(fsp);
1401 else if (fsp->state & FC_SRB_RCV_STATUS)
1402 fc_fcp_complete_locked(fsp);
1403 else
1404 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1405 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1406unlock:
1407 fc_fcp_unlock_pkt(fsp);
1408}
1409
1410/**
1411 * fc_fcp_rec() - Send a REC ELS request
1412 * @fsp: The FCP packet to send the REC request on
1413 */
1414static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1415{
1416 struct fc_lport *lport;
1417 struct fc_frame *fp;
1418 struct fc_rport *rport;
1419 struct fc_rport_libfc_priv *rpriv;
1420
1421 lport = fsp->lp;
1422 rport = fsp->rport;
1423 rpriv = rport->dd_data;
1424 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1425 fsp->status_code = FC_HRD_ERROR;
1426 fsp->io_status = 0;
1427 fc_fcp_complete_locked(fsp);
1428 return;
1429 }
1430
1431 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1432 if (!fp)
1433 goto retry;
1434
1435 fr_seq(fp) = fsp->seq_ptr;
1436 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1437 rpriv->local_port->port_id, FC_TYPE_ELS,
1438 FC_FCTL_REQ, 0);
1439 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1440 fc_fcp_rec_resp, fsp,
1441 2 * lport->r_a_tov)) {
1442 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1443 return;
1444 }
1445retry:
1446 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1447 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1448 else
1449 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1450}
1451
1452/**
1453 * fc_fcp_rec_resp() - Handler for REC ELS responses
1454 * @seq: The sequence the response is on
1455 * @fp: The response frame
1456 * @arg: The FCP packet the response is on
1457 *
1458 * If the response is a reject then the scsi layer will handle
1459 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1460 * set the timeout and return. If the I/O was completed then complete the
1461 * exchange and tell the SCSI layer.
1462 */
1463static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1464{
1465 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1466 struct fc_els_rec_acc *recp;
1467 struct fc_els_ls_rjt *rjt;
1468 u32 e_stat;
1469 u8 opcode;
1470 u32 offset;
1471 enum dma_data_direction data_dir;
1472 enum fc_rctl r_ctl;
1473 struct fc_rport_libfc_priv *rpriv;
1474
1475 if (IS_ERR(fp)) {
1476 fc_fcp_rec_error(fsp, fp);
1477 return;
1478 }
1479
1480 if (fc_fcp_lock_pkt(fsp))
1481 goto out;
1482
1483 fsp->recov_retry = 0;
1484 opcode = fc_frame_payload_op(fp);
1485 if (opcode == ELS_LS_RJT) {
1486 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1487 switch (rjt->er_reason) {
1488 default:
1489 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1490 "reason %d expl %d\n",
1491 fsp->rport->port_id, rjt->er_reason,
1492 rjt->er_explan);
1493 /* fall through */
1494 case ELS_RJT_UNSUP:
1495 FC_FCP_DBG(fsp, "device does not support REC\n");
1496 rpriv = fsp->rport->dd_data;
1497 /*
1498 * if we do not spport RECs or got some bogus
1499 * reason then resetup timer so we check for
1500 * making progress.
1501 */
1502 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1503 break;
1504 case ELS_RJT_LOGIC:
1505 case ELS_RJT_UNAB:
1506 /*
1507 * If no data transfer, the command frame got dropped
1508 * so we just retry. If data was transferred, we
1509 * lost the response but the target has no record,
1510 * so we abort and retry.
1511 */
1512 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1513 fsp->xfer_len == 0) {
1514 fc_fcp_retry_cmd(fsp);
1515 break;
1516 }
1517 fc_fcp_recovery(fsp, FC_ERROR);
1518 break;
1519 }
1520 } else if (opcode == ELS_LS_ACC) {
1521 if (fsp->state & FC_SRB_ABORTED)
1522 goto unlock_out;
1523
1524 data_dir = fsp->cmd->sc_data_direction;
1525 recp = fc_frame_payload_get(fp, sizeof(*recp));
1526 offset = ntohl(recp->reca_fc4value);
1527 e_stat = ntohl(recp->reca_e_stat);
1528
1529 if (e_stat & ESB_ST_COMPLETE) {
1530
1531 /*
1532 * The exchange is complete.
1533 *
1534 * For output, we must've lost the response.
1535 * For input, all data must've been sent.
1536 * We lost may have lost the response
1537 * (and a confirmation was requested) and maybe
1538 * some data.
1539 *
1540 * If all data received, send SRR
1541 * asking for response. If partial data received,
1542 * or gaps, SRR requests data at start of gap.
1543 * Recovery via SRR relies on in-order-delivery.
1544 */
1545 if (data_dir == DMA_TO_DEVICE) {
1546 r_ctl = FC_RCTL_DD_CMD_STATUS;
1547 } else if (fsp->xfer_contig_end == offset) {
1548 r_ctl = FC_RCTL_DD_CMD_STATUS;
1549 } else {
1550 offset = fsp->xfer_contig_end;
1551 r_ctl = FC_RCTL_DD_SOL_DATA;
1552 }
1553 fc_fcp_srr(fsp, r_ctl, offset);
1554 } else if (e_stat & ESB_ST_SEQ_INIT) {
1555 /*
1556 * The remote port has the initiative, so just
1557 * keep waiting for it to complete.
1558 */
1559 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1560 } else {
1561
1562 /*
1563 * The exchange is incomplete, we have seq. initiative.
1564 * Lost response with requested confirmation,
1565 * lost confirmation, lost transfer ready or
1566 * lost write data.
1567 *
1568 * For output, if not all data was received, ask
1569 * for transfer ready to be repeated.
1570 *
1571 * If we received or sent all the data, send SRR to
1572 * request response.
1573 *
1574 * If we lost a response, we may have lost some read
1575 * data as well.
1576 */
1577 r_ctl = FC_RCTL_DD_SOL_DATA;
1578 if (data_dir == DMA_TO_DEVICE) {
1579 r_ctl = FC_RCTL_DD_CMD_STATUS;
1580 if (offset < fsp->data_len)
1581 r_ctl = FC_RCTL_DD_DATA_DESC;
1582 } else if (offset == fsp->xfer_contig_end) {
1583 r_ctl = FC_RCTL_DD_CMD_STATUS;
1584 } else if (fsp->xfer_contig_end < offset) {
1585 offset = fsp->xfer_contig_end;
1586 }
1587 fc_fcp_srr(fsp, r_ctl, offset);
1588 }
1589 }
1590unlock_out:
1591 fc_fcp_unlock_pkt(fsp);
1592out:
1593 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1594 fc_frame_free(fp);
1595}
1596
1597/**
1598 * fc_fcp_rec_error() - Handler for REC errors
1599 * @fsp: The FCP packet the error is on
1600 * @fp: The REC frame
1601 */
1602static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1603{
1604 int error = PTR_ERR(fp);
1605
1606 if (fc_fcp_lock_pkt(fsp))
1607 goto out;
1608
1609 switch (error) {
1610 case -FC_EX_CLOSED:
1611 fc_fcp_retry_cmd(fsp);
1612 break;
1613
1614 default:
1615 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1616 fsp, fsp->rport->port_id, error);
1617 fsp->status_code = FC_CMD_PLOGO;
1618 /* fall through */
1619
1620 case -FC_EX_TIMEOUT:
1621 /*
1622 * Assume REC or LS_ACC was lost.
1623 * The exchange manager will have aborted REC, so retry.
1624 */
1625 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
1626 fsp->rport->port_id, error, fsp->recov_retry,
1627 FC_MAX_RECOV_RETRY);
1628 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1629 fc_fcp_rec(fsp);
1630 else
1631 fc_fcp_recovery(fsp, FC_ERROR);
1632 break;
1633 }
1634 fc_fcp_unlock_pkt(fsp);
1635out:
1636 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1637}
1638
1639/**
1640 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1641 * @fsp: The FCP pkt that needs to be aborted
1642 */
1643static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1644{
1645 fsp->status_code = code;
1646 fsp->cdb_status = 0;
1647 fsp->io_status = 0;
1648 /*
1649 * if this fails then we let the scsi command timer fire and
1650 * scsi-ml escalate.
1651 */
1652 fc_fcp_send_abort(fsp);
1653}
1654
1655/**
1656 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1657 * @fsp: The FCP packet the SRR is to be sent on
1658 * @r_ctl: The R_CTL field for the SRR request
1659 * This is called after receiving status but insufficient data, or
1660 * when expecting status but the request has timed out.
1661 */
1662static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1663{
1664 struct fc_lport *lport = fsp->lp;
1665 struct fc_rport *rport;
1666 struct fc_rport_libfc_priv *rpriv;
1667 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1668 struct fc_seq *seq;
1669 struct fcp_srr *srr;
1670 struct fc_frame *fp;
1671 unsigned int rec_tov;
1672
1673 rport = fsp->rport;
1674 rpriv = rport->dd_data;
1675
1676 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1677 rpriv->rp_state != RPORT_ST_READY)
1678 goto retry; /* shouldn't happen */
1679 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1680 if (!fp)
1681 goto retry;
1682
1683 srr = fc_frame_payload_get(fp, sizeof(*srr));
1684 memset(srr, 0, sizeof(*srr));
1685 srr->srr_op = ELS_SRR;
1686 srr->srr_ox_id = htons(ep->oxid);
1687 srr->srr_rx_id = htons(ep->rxid);
1688 srr->srr_r_ctl = r_ctl;
1689 srr->srr_rel_off = htonl(offset);
1690
1691 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1692 rpriv->local_port->port_id, FC_TYPE_FCP,
1693 FC_FCTL_REQ, 0);
1694
1695 rec_tov = get_fsp_rec_tov(fsp);
1696 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp,
1697 fc_fcp_pkt_destroy,
1698 fsp, jiffies_to_msecs(rec_tov));
1699 if (!seq)
1700 goto retry;
1701
1702 fsp->recov_seq = seq;
1703 fsp->xfer_len = offset;
1704 fsp->xfer_contig_end = offset;
1705 fsp->state &= ~FC_SRB_RCV_STATUS;
1706 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1707 return;
1708retry:
1709 fc_fcp_retry_cmd(fsp);
1710}
1711
1712/**
1713 * fc_fcp_srr_resp() - Handler for SRR response
1714 * @seq: The sequence the SRR is on
1715 * @fp: The SRR frame
1716 * @arg: The FCP packet the SRR is on
1717 */
1718static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1719{
1720 struct fc_fcp_pkt *fsp = arg;
1721 struct fc_frame_header *fh;
1722
1723 if (IS_ERR(fp)) {
1724 fc_fcp_srr_error(fsp, fp);
1725 return;
1726 }
1727
1728 if (fc_fcp_lock_pkt(fsp))
1729 goto out;
1730
1731 fh = fc_frame_header_get(fp);
1732 /*
1733 * BUG? fc_fcp_srr_error calls exch_done which would release
1734 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1735 * then fc_exch_timeout would be sending an abort. The exch_done
1736 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1737 * an abort response though.
1738 */
1739 if (fh->fh_type == FC_TYPE_BLS) {
1740 fc_fcp_unlock_pkt(fsp);
1741 return;
1742 }
1743
1744 switch (fc_frame_payload_op(fp)) {
1745 case ELS_LS_ACC:
1746 fsp->recov_retry = 0;
1747 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1748 break;
1749 case ELS_LS_RJT:
1750 default:
1751 fc_fcp_recovery(fsp, FC_ERROR);
1752 break;
1753 }
1754 fc_fcp_unlock_pkt(fsp);
1755out:
1756 fsp->lp->tt.exch_done(seq);
1757 fc_frame_free(fp);
1758}
1759
1760/**
1761 * fc_fcp_srr_error() - Handler for SRR errors
1762 * @fsp: The FCP packet that the SRR error is on
1763 * @fp: The SRR frame
1764 */
1765static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1766{
1767 if (fc_fcp_lock_pkt(fsp))
1768 goto out;
1769 switch (PTR_ERR(fp)) {
1770 case -FC_EX_TIMEOUT:
1771 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1772 fc_fcp_rec(fsp);
1773 else
1774 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1775 break;
1776 case -FC_EX_CLOSED: /* e.g., link failure */
1777 /* fall through */
1778 default:
1779 fc_fcp_retry_cmd(fsp);
1780 break;
1781 }
1782 fc_fcp_unlock_pkt(fsp);
1783out:
1784 fsp->lp->tt.exch_done(fsp->recov_seq);
1785}
1786
1787/**
1788 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1789 * @lport: The local port to be checked
1790 */
1791static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1792{
1793 /* lock ? */
1794 return (lport->state == LPORT_ST_READY) &&
1795 lport->link_up && !lport->qfull;
1796}
1797
1798/**
1799 * fc_queuecommand() - The queuecommand function of the SCSI template
1800 * @shost: The Scsi_Host that the command was issued to
1801 * @cmd: The scsi_cmnd to be executed
1802 *
1803 * This is the i/o strategy routine, called by the SCSI layer.
1804 */
1805int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1806{
1807 struct fc_lport *lport = shost_priv(shost);
1808 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1809 struct fc_fcp_pkt *fsp;
1810 struct fc_rport_libfc_priv *rpriv;
1811 int rval;
1812 int rc = 0;
1813 struct fc_stats *stats;
1814
1815 rval = fc_remote_port_chkready(rport);
1816 if (rval) {
1817 sc_cmd->result = rval;
1818 sc_cmd->scsi_done(sc_cmd);
1819 return 0;
1820 }
1821
1822 if (!*(struct fc_remote_port **)rport->dd_data) {
1823 /*
1824 * rport is transitioning from blocked/deleted to
1825 * online
1826 */
1827 sc_cmd->result = DID_IMM_RETRY << 16;
1828 sc_cmd->scsi_done(sc_cmd);
1829 goto out;
1830 }
1831
1832 rpriv = rport->dd_data;
1833
1834 if (!fc_fcp_lport_queue_ready(lport)) {
1835 if (lport->qfull)
1836 fc_fcp_can_queue_ramp_down(lport);
1837 rc = SCSI_MLQUEUE_HOST_BUSY;
1838 goto out;
1839 }
1840
1841 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1842 if (fsp == NULL) {
1843 rc = SCSI_MLQUEUE_HOST_BUSY;
1844 goto out;
1845 }
1846
1847 /*
1848 * build the libfc request pkt
1849 */
1850 fsp->cmd = sc_cmd; /* save the cmd */
1851 fsp->rport = rport; /* set the remote port ptr */
1852
1853 /*
1854 * set up the transfer length
1855 */
1856 fsp->data_len = scsi_bufflen(sc_cmd);
1857 fsp->xfer_len = 0;
1858
1859 /*
1860 * setup the data direction
1861 */
1862 stats = per_cpu_ptr(lport->stats, get_cpu());
1863 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1864 fsp->req_flags = FC_SRB_READ;
1865 stats->InputRequests++;
1866 stats->InputBytes += fsp->data_len;
1867 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1868 fsp->req_flags = FC_SRB_WRITE;
1869 stats->OutputRequests++;
1870 stats->OutputBytes += fsp->data_len;
1871 } else {
1872 fsp->req_flags = 0;
1873 stats->ControlRequests++;
1874 }
1875 put_cpu();
1876
1877 /*
1878 * send it to the lower layer
1879 * if we get -1 return then put the request in the pending
1880 * queue.
1881 */
1882 rval = fc_fcp_pkt_send(lport, fsp);
1883 if (rval != 0) {
1884 fsp->state = FC_SRB_FREE;
1885 fc_fcp_pkt_release(fsp);
1886 rc = SCSI_MLQUEUE_HOST_BUSY;
1887 }
1888out:
1889 return rc;
1890}
1891EXPORT_SYMBOL(fc_queuecommand);
1892
1893/**
1894 * fc_io_compl() - Handle responses for completed commands
1895 * @fsp: The FCP packet that is complete
1896 *
1897 * Translates fcp_pkt errors to a Linux SCSI errors.
1898 * The fcp packet lock must be held when calling.
1899 */
1900static void fc_io_compl(struct fc_fcp_pkt *fsp)
1901{
1902 struct fc_fcp_internal *si;
1903 struct scsi_cmnd *sc_cmd;
1904 struct fc_lport *lport;
1905 unsigned long flags;
1906
1907 /* release outstanding ddp context */
1908 fc_fcp_ddp_done(fsp);
1909
1910 fsp->state |= FC_SRB_COMPL;
1911 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1912 spin_unlock_bh(&fsp->scsi_pkt_lock);
1913 del_timer_sync(&fsp->timer);
1914 spin_lock_bh(&fsp->scsi_pkt_lock);
1915 }
1916
1917 lport = fsp->lp;
1918 si = fc_get_scsi_internal(lport);
1919
1920 /*
1921 * if can_queue ramp down is done then try can_queue ramp up
1922 * since commands are completing now.
1923 */
1924 if (si->last_can_queue_ramp_down_time)
1925 fc_fcp_can_queue_ramp_up(lport);
1926
1927 sc_cmd = fsp->cmd;
1928 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1929 switch (fsp->status_code) {
1930 case FC_COMPLETE:
1931 if (fsp->cdb_status == 0) {
1932 /*
1933 * good I/O status
1934 */
1935 sc_cmd->result = DID_OK << 16;
1936 if (fsp->scsi_resid)
1937 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1938 } else {
1939 /*
1940 * transport level I/O was ok but scsi
1941 * has non zero status
1942 */
1943 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1944 }
1945 break;
1946 case FC_ERROR:
1947 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1948 "due to FC_ERROR\n");
1949 sc_cmd->result = DID_ERROR << 16;
1950 break;
1951 case FC_DATA_UNDRUN:
1952 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1953 /*
1954 * scsi status is good but transport level
1955 * underrun.
1956 */
1957 if (fsp->state & FC_SRB_RCV_STATUS) {
1958 sc_cmd->result = DID_OK << 16;
1959 } else {
1960 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
1961 " due to FC_DATA_UNDRUN (trans)\n");
1962 sc_cmd->result = DID_ERROR << 16;
1963 }
1964 } else {
1965 /*
1966 * scsi got underrun, this is an error
1967 */
1968 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1969 "due to FC_DATA_UNDRUN (scsi)\n");
1970 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1971 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1972 }
1973 break;
1974 case FC_DATA_OVRRUN:
1975 /*
1976 * overrun is an error
1977 */
1978 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1979 "due to FC_DATA_OVRRUN\n");
1980 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1981 break;
1982 case FC_CMD_ABORTED:
1983 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1984 "due to FC_CMD_ABORTED\n");
1985 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1986 break;
1987 case FC_CMD_RESET:
1988 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
1989 "due to FC_CMD_RESET\n");
1990 sc_cmd->result = (DID_RESET << 16);
1991 break;
1992 case FC_HRD_ERROR:
1993 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
1994 "due to FC_HRD_ERROR\n");
1995 sc_cmd->result = (DID_NO_CONNECT << 16);
1996 break;
1997 case FC_CRC_ERROR:
1998 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
1999 "due to FC_CRC_ERROR\n");
2000 sc_cmd->result = (DID_PARITY << 16);
2001 break;
2002 case FC_TIMED_OUT:
2003 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
2004 "due to FC_TIMED_OUT\n");
2005 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
2006 break;
2007 default:
2008 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
2009 "due to unknown error\n");
2010 sc_cmd->result = (DID_ERROR << 16);
2011 break;
2012 }
2013
2014 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
2015 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
2016
2017 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2018 list_del(&fsp->list);
2019 sc_cmd->SCp.ptr = NULL;
2020 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2021 sc_cmd->scsi_done(sc_cmd);
2022
2023 /* release ref from initial allocation in queue command */
2024 fc_fcp_pkt_release(fsp);
2025}
2026
2027/**
2028 * fc_eh_abort() - Abort a command
2029 * @sc_cmd: The SCSI command to abort
2030 *
2031 * From SCSI host template.
2032 * Send an ABTS to the target device and wait for the response.
2033 */
2034int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2035{
2036 struct fc_fcp_pkt *fsp;
2037 struct fc_lport *lport;
2038 struct fc_fcp_internal *si;
2039 int rc = FAILED;
2040 unsigned long flags;
2041 int rval;
2042
2043 rval = fc_block_scsi_eh(sc_cmd);
2044 if (rval)
2045 return rval;
2046
2047 lport = shost_priv(sc_cmd->device->host);
2048 if (lport->state != LPORT_ST_READY)
2049 return rc;
2050 else if (!lport->link_up)
2051 return rc;
2052
2053 si = fc_get_scsi_internal(lport);
2054 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2055 fsp = CMD_SP(sc_cmd);
2056 if (!fsp) {
2057 /* command completed while scsi eh was setting up */
2058 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2059 return SUCCESS;
2060 }
2061 /* grab a ref so the fsp and sc_cmd cannot be relased from under us */
2062 fc_fcp_pkt_hold(fsp);
2063 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2064
2065 if (fc_fcp_lock_pkt(fsp)) {
2066 /* completed while we were waiting for timer to be deleted */
2067 rc = SUCCESS;
2068 goto release_pkt;
2069 }
2070
2071 rc = fc_fcp_pkt_abort(fsp);
2072 fc_fcp_unlock_pkt(fsp);
2073
2074release_pkt:
2075 fc_fcp_pkt_release(fsp);
2076 return rc;
2077}
2078EXPORT_SYMBOL(fc_eh_abort);
2079
2080/**
2081 * fc_eh_device_reset() - Reset a single LUN
2082 * @sc_cmd: The SCSI command which identifies the device whose
2083 * LUN is to be reset
2084 *
2085 * Set from SCSI host template.
2086 */
2087int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2088{
2089 struct fc_lport *lport;
2090 struct fc_fcp_pkt *fsp;
2091 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2092 int rc = FAILED;
2093 int rval;
2094
2095 rval = fc_block_scsi_eh(sc_cmd);
2096 if (rval)
2097 return rval;
2098
2099 lport = shost_priv(sc_cmd->device->host);
2100
2101 if (lport->state != LPORT_ST_READY)
2102 return rc;
2103
2104 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2105
2106 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2107 if (fsp == NULL) {
2108 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2109 goto out;
2110 }
2111
2112 /*
2113 * Build the libfc request pkt. Do not set the scsi cmnd, because
2114 * the sc passed in is not setup for execution like when sent
2115 * through the queuecommand callout.
2116 */
2117 fsp->rport = rport; /* set the remote port ptr */
2118
2119 /*
2120 * flush outstanding commands
2121 */
2122 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2123 fsp->state = FC_SRB_FREE;
2124 fc_fcp_pkt_release(fsp);
2125
2126out:
2127 return rc;
2128}
2129EXPORT_SYMBOL(fc_eh_device_reset);
2130
2131/**
2132 * fc_eh_host_reset() - Reset a Scsi_Host.
2133 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2134 */
2135int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2136{
2137 struct Scsi_Host *shost = sc_cmd->device->host;
2138 struct fc_lport *lport = shost_priv(shost);
2139 unsigned long wait_tmo;
2140
2141 FC_SCSI_DBG(lport, "Resetting host\n");
2142
2143 fc_block_scsi_eh(sc_cmd);
2144
2145 lport->tt.lport_reset(lport);
2146 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2147 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2148 wait_tmo))
2149 msleep(1000);
2150
2151 if (fc_fcp_lport_queue_ready(lport)) {
2152 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2153 "on port (%6.6x)\n", lport->port_id);
2154 return SUCCESS;
2155 } else {
2156 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2157 "port (%6.6x) is not ready.\n",
2158 lport->port_id);
2159 return FAILED;
2160 }
2161}
2162EXPORT_SYMBOL(fc_eh_host_reset);
2163
2164/**
2165 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2166 * @sdev: The SCSI device that identifies the SCSI host
2167 *
2168 * Configures queue depth based on host's cmd_per_len. If not set
2169 * then we use the libfc default.
2170 */
2171int fc_slave_alloc(struct scsi_device *sdev)
2172{
2173 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2174
2175 if (!rport || fc_remote_port_chkready(rport))
2176 return -ENXIO;
2177
2178 if (sdev->tagged_supported)
2179 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2180 else
2181 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2182 FC_FCP_DFLT_QUEUE_DEPTH);
2183
2184 return 0;
2185}
2186EXPORT_SYMBOL(fc_slave_alloc);
2187
2188/**
2189 * fc_change_queue_depth() - Change a device's queue depth
2190 * @sdev: The SCSI device whose queue depth is to change
2191 * @qdepth: The new queue depth
2192 * @reason: The resason for the change
2193 */
2194int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2195{
2196 switch (reason) {
2197 case SCSI_QDEPTH_DEFAULT:
2198 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2199 break;
2200 case SCSI_QDEPTH_QFULL:
2201 scsi_track_queue_full(sdev, qdepth);
2202 break;
2203 case SCSI_QDEPTH_RAMP_UP:
2204 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2205 break;
2206 default:
2207 return -EOPNOTSUPP;
2208 }
2209 return sdev->queue_depth;
2210}
2211EXPORT_SYMBOL(fc_change_queue_depth);
2212
2213/**
2214 * fc_change_queue_type() - Change a device's queue type
2215 * @sdev: The SCSI device whose queue depth is to change
2216 * @tag_type: Identifier for queue type
2217 */
2218int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2219{
2220 if (sdev->tagged_supported) {
2221 scsi_set_tag_type(sdev, tag_type);
2222 if (tag_type)
2223 scsi_activate_tcq(sdev, sdev->queue_depth);
2224 else
2225 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2226 } else
2227 tag_type = 0;
2228
2229 return tag_type;
2230}
2231EXPORT_SYMBOL(fc_change_queue_type);
2232
2233/**
2234 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2235 * @lport: The local port that no longer needs the FCP layer
2236 */
2237void fc_fcp_destroy(struct fc_lport *lport)
2238{
2239 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2240
2241 if (!list_empty(&si->scsi_pkt_queue))
2242 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2243 "port (%6.6x)\n", lport->port_id);
2244
2245 mempool_destroy(si->scsi_pkt_pool);
2246 kfree(si);
2247 lport->scsi_priv = NULL;
2248}
2249EXPORT_SYMBOL(fc_fcp_destroy);
2250
2251int fc_setup_fcp(void)
2252{
2253 int rc = 0;
2254
2255 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2256 sizeof(struct fc_fcp_pkt),
2257 0, SLAB_HWCACHE_ALIGN, NULL);
2258 if (!scsi_pkt_cachep) {
2259 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2260 "module load failed!");
2261 rc = -ENOMEM;
2262 }
2263
2264 return rc;
2265}
2266
2267void fc_destroy_fcp(void)
2268{
2269 if (scsi_pkt_cachep)
2270 kmem_cache_destroy(scsi_pkt_cachep);
2271}
2272
2273/**
2274 * fc_fcp_init() - Initialize the FCP layer for a local port
2275 * @lport: The local port to initialize the exchange layer for
2276 */
2277int fc_fcp_init(struct fc_lport *lport)
2278{
2279 int rc;
2280 struct fc_fcp_internal *si;
2281
2282 if (!lport->tt.fcp_cmd_send)
2283 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2284
2285 if (!lport->tt.fcp_cleanup)
2286 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2287
2288 if (!lport->tt.fcp_abort_io)
2289 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2290
2291 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2292 if (!si)
2293 return -ENOMEM;
2294 lport->scsi_priv = si;
2295 si->max_can_queue = lport->host->can_queue;
2296 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2297 spin_lock_init(&si->scsi_queue_lock);
2298
2299 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2300 if (!si->scsi_pkt_pool) {
2301 rc = -ENOMEM;
2302 goto free_internal;
2303 }
2304 return 0;
2305
2306free_internal:
2307 kfree(si);
2308 return rc;
2309}
2310EXPORT_SYMBOL(fc_fcp_init);
kernel source for telekom puls (alcatel/mediatek)