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42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | |
3 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. | |
4 | * Copyright(c) 2008 Mike Christie | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | * | |
19 | * Maintained at www.Open-FCoE.org | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/scatterlist.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/crc32.h> | |
30 | ||
31 | #include <scsi/scsi_tcq.h> | |
32 | #include <scsi/scsi.h> | |
33 | #include <scsi/scsi_host.h> | |
34 | #include <scsi/scsi_device.h> | |
35 | #include <scsi/scsi_cmnd.h> | |
36 | ||
37 | #include <scsi/fc/fc_fc2.h> | |
38 | ||
39 | #include <scsi/libfc.h> | |
40 | #include <scsi/fc_encode.h> | |
41 | ||
42 | MODULE_AUTHOR("Open-FCoE.org"); | |
43 | MODULE_DESCRIPTION("libfc"); | |
44 | MODULE_LICENSE("GPL"); | |
45 | ||
46 | static int fc_fcp_debug; | |
47 | ||
48 | #define FC_DEBUG_FCP(fmt...) \ | |
49 | do { \ | |
50 | if (fc_fcp_debug) \ | |
51 | FC_DBG(fmt); \ | |
52 | } while (0) | |
53 | ||
54 | static struct kmem_cache *scsi_pkt_cachep; | |
55 | ||
56 | /* SRB state definitions */ | |
57 | #define FC_SRB_FREE 0 /* cmd is free */ | |
58 | #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ | |
59 | #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ | |
60 | #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ | |
61 | #define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */ | |
62 | #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ | |
63 | #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ | |
64 | #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ | |
65 | #define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */ | |
66 | ||
67 | #define FC_SRB_READ (1 << 1) | |
68 | #define FC_SRB_WRITE (1 << 0) | |
69 | ||
70 | /* | |
71 | * The SCp.ptr should be tested and set under the host lock. NULL indicates | |
72 | * that the command has been retruned to the scsi layer. | |
73 | */ | |
74 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) | |
75 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) | |
76 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) | |
77 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) | |
78 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) | |
79 | ||
80 | struct fc_fcp_internal { | |
81 | mempool_t *scsi_pkt_pool; | |
82 | struct list_head scsi_pkt_queue; | |
83 | u8 throttled; | |
84 | }; | |
85 | ||
86 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
87 | ||
88 | /* | |
89 | * function prototypes | |
90 | * FC scsi I/O related functions | |
91 | */ | |
92 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
93 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
94 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
95 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
96 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
97 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp); | |
98 | static void fc_timeout_error(struct fc_fcp_pkt *); | |
99 | static void fc_fcp_timeout(unsigned long data); | |
100 | static void fc_fcp_rec(struct fc_fcp_pkt *); | |
101 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
102 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
103 | static void fc_io_compl(struct fc_fcp_pkt *); | |
104 | ||
105 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
106 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
107 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
108 | ||
109 | /* | |
110 | * command status codes | |
111 | */ | |
112 | #define FC_COMPLETE 0 | |
113 | #define FC_CMD_ABORTED 1 | |
114 | #define FC_CMD_RESET 2 | |
115 | #define FC_CMD_PLOGO 3 | |
116 | #define FC_SNS_RCV 4 | |
117 | #define FC_TRANS_ERR 5 | |
118 | #define FC_DATA_OVRRUN 6 | |
119 | #define FC_DATA_UNDRUN 7 | |
120 | #define FC_ERROR 8 | |
121 | #define FC_HRD_ERROR 9 | |
122 | #define FC_CMD_TIME_OUT 10 | |
123 | ||
124 | /* | |
125 | * Error recovery timeout values. | |
126 | */ | |
127 | #define FC_SCSI_ER_TIMEOUT (10 * HZ) | |
128 | #define FC_SCSI_TM_TOV (10 * HZ) | |
129 | #define FC_SCSI_REC_TOV (2 * HZ) | |
130 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) | |
131 | ||
132 | #define FC_MAX_ERROR_CNT 5 | |
133 | #define FC_MAX_RECOV_RETRY 3 | |
134 | ||
135 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
136 | ||
137 | /** | |
138 | * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet | |
139 | * @lp: fc lport struct | |
140 | * @gfp: gfp flags for allocation | |
141 | * | |
142 | * This is used by upper layer scsi driver. | |
143 | * Return Value : scsi_pkt structure or null on allocation failure. | |
144 | * Context : call from process context. no locking required. | |
145 | */ | |
146 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp) | |
147 | { | |
148 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
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 = lp; | |
155 | atomic_set(&fsp->ref_cnt, 1); | |
156 | init_timer(&fsp->timer); | |
157 | INIT_LIST_HEAD(&fsp->list); | |
158 | spin_lock_init(&fsp->scsi_pkt_lock); | |
159 | } | |
160 | return fsp; | |
161 | } | |
162 | ||
163 | /** | |
34f42a07 | 164 | * fc_fcp_pkt_release() - release hold on scsi_pkt packet |
42e9a92f RL |
165 | * @fsp: fcp packet struct |
166 | * | |
167 | * This is used by upper layer scsi driver. | |
168 | * Context : call from process and interrupt context. | |
169 | * no locking required | |
170 | */ | |
171 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
172 | { | |
173 | if (atomic_dec_and_test(&fsp->ref_cnt)) { | |
174 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); | |
175 | ||
176 | mempool_free(fsp, si->scsi_pkt_pool); | |
177 | } | |
178 | } | |
179 | ||
180 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) | |
181 | { | |
182 | atomic_inc(&fsp->ref_cnt); | |
183 | } | |
184 | ||
185 | /** | |
34f42a07 | 186 | * fc_fcp_pkt_destory() - release hold on scsi_pkt packet |
42e9a92f RL |
187 | * @seq: exchange sequence |
188 | * @fsp: fcp packet struct | |
189 | * | |
190 | * Release hold on scsi_pkt packet set to keep scsi_pkt | |
191 | * till EM layer exch resource is not freed. | |
192 | * Context : called from from EM layer. | |
193 | * no locking required | |
194 | */ | |
195 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
196 | { | |
197 | fc_fcp_pkt_release(fsp); | |
198 | } | |
199 | ||
200 | /** | |
34f42a07 | 201 | * fc_fcp_lock_pkt() - lock a packet and get a ref to it. |
42e9a92f RL |
202 | * @fsp: fcp packet |
203 | * | |
204 | * We should only return error if we return a command to scsi-ml before | |
205 | * getting a response. This can happen in cases where we send a abort, but | |
206 | * do not wait for the response and the abort and command can be passing | |
207 | * each other on the wire/network-layer. | |
208 | * | |
209 | * Note: this function locks the packet and gets a reference to allow | |
210 | * callers to call the completion function while the lock is held and | |
211 | * not have to worry about the packets refcount. | |
212 | * | |
213 | * TODO: Maybe we should just have callers grab/release the lock and | |
214 | * have a function that they call to verify the fsp and grab a ref if | |
215 | * needed. | |
216 | */ | |
217 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
218 | { | |
219 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
220 | if (fsp->state & FC_SRB_COMPL) { | |
221 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
222 | return -EPERM; | |
223 | } | |
224 | ||
225 | fc_fcp_pkt_hold(fsp); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) | |
230 | { | |
231 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
232 | fc_fcp_pkt_release(fsp); | |
233 | } | |
234 | ||
235 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) | |
236 | { | |
237 | if (!(fsp->state & FC_SRB_COMPL)) | |
238 | mod_timer(&fsp->timer, jiffies + delay); | |
239 | } | |
240 | ||
241 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) | |
242 | { | |
243 | if (!fsp->seq_ptr) | |
244 | return -EINVAL; | |
245 | ||
246 | fsp->state |= FC_SRB_ABORT_PENDING; | |
247 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); | |
248 | } | |
249 | ||
250 | /* | |
251 | * Retry command. | |
252 | * An abort isn't needed. | |
253 | */ | |
254 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) | |
255 | { | |
256 | if (fsp->seq_ptr) { | |
257 | fsp->lp->tt.exch_done(fsp->seq_ptr); | |
258 | fsp->seq_ptr = NULL; | |
259 | } | |
260 | ||
261 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 262 | fsp->io_status = 0; |
42e9a92f RL |
263 | fsp->status_code = FC_ERROR; |
264 | fc_fcp_complete_locked(fsp); | |
265 | } | |
266 | ||
b277d2aa YZ |
267 | /* |
268 | * fc_fcp_ddp_setup - calls to LLD's ddp_setup to set up DDP | |
269 | * transfer for a read I/O indicated by the fc_fcp_pkt. | |
270 | * @fsp: ptr to the fc_fcp_pkt | |
271 | * | |
272 | * This is called in exch_seq_send() when we have a newly allocated | |
273 | * exchange with a valid exchange id to setup ddp. | |
274 | * | |
275 | * returns: none | |
276 | */ | |
277 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
278 | { | |
279 | struct fc_lport *lp; | |
280 | ||
281 | if (!fsp) | |
282 | return; | |
283 | ||
284 | lp = fsp->lp; | |
285 | if ((fsp->req_flags & FC_SRB_READ) && | |
286 | (lp->lro_enabled) && (lp->tt.ddp_setup)) { | |
287 | if (lp->tt.ddp_setup(lp, xid, scsi_sglist(fsp->cmd), | |
288 | scsi_sg_count(fsp->cmd))) | |
289 | fsp->xfer_ddp = xid; | |
290 | } | |
291 | } | |
292 | EXPORT_SYMBOL(fc_fcp_ddp_setup); | |
293 | ||
294 | /* | |
295 | * fc_fcp_ddp_done - calls to LLD's ddp_done to release any | |
296 | * DDP related resources for this I/O if it is initialized | |
297 | * as a ddp transfer | |
298 | * @fsp: ptr to the fc_fcp_pkt | |
299 | * | |
300 | * returns: none | |
301 | */ | |
302 | static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) | |
303 | { | |
304 | struct fc_lport *lp; | |
305 | ||
306 | if (!fsp) | |
307 | return; | |
308 | ||
309 | lp = fsp->lp; | |
310 | if (fsp->xfer_ddp && lp->tt.ddp_done) { | |
311 | fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp); | |
312 | fsp->xfer_ddp = 0; | |
313 | } | |
314 | } | |
315 | ||
316 | ||
42e9a92f RL |
317 | /* |
318 | * Receive SCSI data from target. | |
319 | * Called after receiving solicited data. | |
320 | */ | |
321 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
322 | { | |
323 | struct scsi_cmnd *sc = fsp->cmd; | |
324 | struct fc_lport *lp = fsp->lp; | |
325 | struct fcoe_dev_stats *stats; | |
326 | struct fc_frame_header *fh; | |
327 | size_t start_offset; | |
328 | size_t offset; | |
329 | u32 crc; | |
330 | u32 copy_len = 0; | |
331 | size_t len; | |
332 | void *buf; | |
333 | struct scatterlist *sg; | |
334 | size_t remaining; | |
335 | ||
336 | fh = fc_frame_header_get(fp); | |
337 | offset = ntohl(fh->fh_parm_offset); | |
338 | start_offset = offset; | |
339 | len = fr_len(fp) - sizeof(*fh); | |
340 | buf = fc_frame_payload_get(fp, 0); | |
341 | ||
b277d2aa YZ |
342 | /* if this I/O is ddped, update xfer len */ |
343 | fc_fcp_ddp_done(fsp); | |
344 | ||
42e9a92f | 345 | if (offset + len > fsp->data_len) { |
34f42a07 | 346 | /* this should never happen */ |
42e9a92f RL |
347 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
348 | fc_frame_crc_check(fp)) | |
349 | goto crc_err; | |
350 | FC_DEBUG_FCP("data received past end. len %zx offset %zx " | |
351 | "data_len %x\n", len, offset, fsp->data_len); | |
352 | fc_fcp_retry_cmd(fsp); | |
353 | return; | |
354 | } | |
355 | if (offset != fsp->xfer_len) | |
356 | fsp->state |= FC_SRB_DISCONTIG; | |
357 | ||
358 | crc = 0; | |
359 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) | |
360 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
361 | ||
362 | sg = scsi_sglist(sc); | |
363 | remaining = len; | |
364 | ||
365 | while (remaining > 0 && sg) { | |
366 | size_t off; | |
367 | void *page_addr; | |
368 | size_t sg_bytes; | |
369 | ||
370 | if (offset >= sg->length) { | |
371 | offset -= sg->length; | |
372 | sg = sg_next(sg); | |
373 | continue; | |
374 | } | |
375 | sg_bytes = min(remaining, sg->length - offset); | |
376 | ||
377 | /* | |
378 | * The scatterlist item may be bigger than PAGE_SIZE, | |
379 | * but we are limited to mapping PAGE_SIZE at a time. | |
380 | */ | |
381 | off = offset + sg->offset; | |
382 | sg_bytes = min(sg_bytes, (size_t) | |
383 | (PAGE_SIZE - (off & ~PAGE_MASK))); | |
384 | page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT), | |
385 | KM_SOFTIRQ0); | |
386 | if (!page_addr) | |
387 | break; /* XXX panic? */ | |
388 | ||
389 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) | |
390 | crc = crc32(crc, buf, sg_bytes); | |
391 | memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, | |
392 | sg_bytes); | |
393 | ||
394 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
395 | buf += sg_bytes; | |
396 | offset += sg_bytes; | |
397 | remaining -= sg_bytes; | |
398 | copy_len += sg_bytes; | |
399 | } | |
400 | ||
401 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
402 | buf = fc_frame_payload_get(fp, 0); | |
403 | if (len % 4) { | |
404 | crc = crc32(crc, buf + len, 4 - (len % 4)); | |
405 | len += 4 - (len % 4); | |
406 | } | |
407 | ||
408 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
409 | crc_err: | |
410 | stats = lp->dev_stats[smp_processor_id()]; | |
411 | stats->ErrorFrames++; | |
412 | if (stats->InvalidCRCCount++ < 5) | |
413 | FC_DBG("CRC error on data frame\n"); | |
414 | /* | |
415 | * Assume the frame is total garbage. | |
416 | * We may have copied it over the good part | |
417 | * of the buffer. | |
418 | * If so, we need to retry the entire operation. | |
419 | * Otherwise, ignore it. | |
420 | */ | |
421 | if (fsp->state & FC_SRB_DISCONTIG) | |
422 | fc_fcp_retry_cmd(fsp); | |
423 | return; | |
424 | } | |
425 | } | |
426 | ||
427 | if (fsp->xfer_contig_end == start_offset) | |
428 | fsp->xfer_contig_end += copy_len; | |
429 | fsp->xfer_len += copy_len; | |
430 | ||
431 | /* | |
432 | * In the very rare event that this data arrived after the response | |
433 | * and completes the transfer, call the completion handler. | |
434 | */ | |
435 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
436 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
437 | fc_fcp_complete_locked(fsp); | |
438 | } | |
439 | ||
34f42a07 RL |
440 | /** |
441 | * fc_fcp_send_data() - Send SCSI data to target. | |
42e9a92f RL |
442 | * @fsp: ptr to fc_fcp_pkt |
443 | * @sp: ptr to this sequence | |
444 | * @offset: starting offset for this data request | |
445 | * @seq_blen: the burst length for this data request | |
446 | * | |
447 | * Called after receiving a Transfer Ready data descriptor. | |
448 | * if LLD is capable of seq offload then send down seq_blen | |
449 | * size of data in single frame, otherwise send multiple FC | |
450 | * frames of max FC frame payload supported by target port. | |
451 | * | |
452 | * Returns : 0 for success. | |
453 | */ | |
454 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
455 | size_t offset, size_t seq_blen) | |
456 | { | |
457 | struct fc_exch *ep; | |
458 | struct scsi_cmnd *sc; | |
459 | struct scatterlist *sg; | |
460 | struct fc_frame *fp = NULL; | |
461 | struct fc_lport *lp = fsp->lp; | |
462 | size_t remaining; | |
463 | size_t t_blen; | |
464 | size_t tlen; | |
465 | size_t sg_bytes; | |
466 | size_t frame_offset, fh_parm_offset; | |
467 | int error; | |
468 | void *data = NULL; | |
469 | void *page_addr; | |
470 | int using_sg = lp->sg_supp; | |
471 | u32 f_ctl; | |
472 | ||
473 | WARN_ON(seq_blen <= 0); | |
474 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
475 | /* this should never happen */ | |
476 | FC_DEBUG_FCP("xfer-ready past end. seq_blen %zx offset %zx\n", | |
477 | seq_blen, offset); | |
478 | fc_fcp_send_abort(fsp); | |
479 | return 0; | |
480 | } else if (offset != fsp->xfer_len) { | |
481 | /* Out of Order Data Request - no problem, but unexpected. */ | |
482 | FC_DEBUG_FCP("xfer-ready non-contiguous. " | |
483 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
484 | } | |
485 | ||
486 | /* | |
487 | * if LLD is capable of seq_offload then set transport | |
488 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
489 | * to max FC frame payload previously set in fsp->max_payload. | |
490 | */ | |
276d6814 YZ |
491 | t_blen = fsp->max_payload; |
492 | if (lp->seq_offload) { | |
493 | t_blen = min(seq_blen, (size_t)lp->lso_max); | |
494 | FC_DEBUG_FCP("fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", | |
495 | fsp, seq_blen, lp->lso_max, t_blen); | |
496 | } | |
497 | ||
42e9a92f RL |
498 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); |
499 | if (t_blen > 512) | |
500 | t_blen &= ~(512 - 1); /* round down to block size */ | |
501 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ | |
502 | sc = fsp->cmd; | |
503 | ||
504 | remaining = seq_blen; | |
505 | fh_parm_offset = frame_offset = offset; | |
506 | tlen = 0; | |
507 | seq = lp->tt.seq_start_next(seq); | |
508 | f_ctl = FC_FC_REL_OFF; | |
509 | WARN_ON(!seq); | |
510 | ||
511 | /* | |
512 | * If a get_page()/put_page() will fail, don't use sg lists | |
513 | * in the fc_frame structure. | |
514 | * | |
515 | * The put_page() may be long after the I/O has completed | |
516 | * in the case of FCoE, since the network driver does it | |
517 | * via free_skb(). See the test in free_pages_check(). | |
518 | * | |
519 | * Test this case with 'dd </dev/zero >/dev/st0 bs=64k'. | |
520 | */ | |
521 | if (using_sg) { | |
522 | for (sg = scsi_sglist(sc); sg; sg = sg_next(sg)) { | |
523 | if (page_count(sg_page(sg)) == 0 || | |
524 | (sg_page(sg)->flags & (1 << PG_lru | | |
525 | 1 << PG_private | | |
526 | 1 << PG_locked | | |
527 | 1 << PG_active | | |
528 | 1 << PG_slab | | |
529 | 1 << PG_swapcache | | |
530 | 1 << PG_writeback | | |
531 | 1 << PG_reserved | | |
532 | 1 << PG_buddy))) { | |
533 | using_sg = 0; | |
534 | break; | |
535 | } | |
536 | } | |
537 | } | |
538 | sg = scsi_sglist(sc); | |
539 | ||
540 | while (remaining > 0 && sg) { | |
541 | if (offset >= sg->length) { | |
542 | offset -= sg->length; | |
543 | sg = sg_next(sg); | |
544 | continue; | |
545 | } | |
546 | if (!fp) { | |
547 | tlen = min(t_blen, remaining); | |
548 | ||
549 | /* | |
550 | * TODO. Temporary workaround. fc_seq_send() can't | |
551 | * handle odd lengths in non-linear skbs. | |
552 | * This will be the final fragment only. | |
553 | */ | |
554 | if (tlen % 4) | |
555 | using_sg = 0; | |
556 | if (using_sg) { | |
557 | fp = _fc_frame_alloc(lp, 0); | |
558 | if (!fp) | |
559 | return -ENOMEM; | |
560 | } else { | |
561 | fp = fc_frame_alloc(lp, tlen); | |
562 | if (!fp) | |
563 | return -ENOMEM; | |
564 | ||
565 | data = (void *)(fr_hdr(fp)) + | |
566 | sizeof(struct fc_frame_header); | |
567 | } | |
568 | fh_parm_offset = frame_offset; | |
569 | fr_max_payload(fp) = fsp->max_payload; | |
570 | } | |
571 | sg_bytes = min(tlen, sg->length - offset); | |
572 | if (using_sg) { | |
573 | WARN_ON(skb_shinfo(fp_skb(fp))->nr_frags > | |
574 | FC_FRAME_SG_LEN); | |
575 | get_page(sg_page(sg)); | |
576 | skb_fill_page_desc(fp_skb(fp), | |
577 | skb_shinfo(fp_skb(fp))->nr_frags, | |
578 | sg_page(sg), sg->offset + offset, | |
579 | sg_bytes); | |
580 | fp_skb(fp)->data_len += sg_bytes; | |
581 | fr_len(fp) += sg_bytes; | |
582 | fp_skb(fp)->truesize += PAGE_SIZE; | |
583 | } else { | |
584 | size_t off = offset + sg->offset; | |
585 | ||
586 | /* | |
587 | * The scatterlist item may be bigger than PAGE_SIZE, | |
588 | * but we must not cross pages inside the kmap. | |
589 | */ | |
590 | sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE - | |
591 | (off & ~PAGE_MASK))); | |
592 | page_addr = kmap_atomic(sg_page(sg) + | |
593 | (off >> PAGE_SHIFT), | |
594 | KM_SOFTIRQ0); | |
595 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), | |
596 | sg_bytes); | |
597 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
598 | data += sg_bytes; | |
599 | } | |
600 | offset += sg_bytes; | |
601 | frame_offset += sg_bytes; | |
602 | tlen -= sg_bytes; | |
603 | remaining -= sg_bytes; | |
604 | ||
605 | if (tlen) | |
606 | continue; | |
607 | ||
608 | /* | |
609 | * Send sequence with transfer sequence initiative in case | |
610 | * this is last FCP frame of the sequence. | |
611 | */ | |
612 | if (remaining == 0) | |
613 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
614 | ||
615 | ep = fc_seq_exch(seq); | |
616 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
617 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
618 | ||
619 | /* | |
620 | * send fragment using for a sequence. | |
621 | */ | |
622 | error = lp->tt.seq_send(lp, seq, fp); | |
623 | if (error) { | |
624 | WARN_ON(1); /* send error should be rare */ | |
625 | fc_fcp_retry_cmd(fsp); | |
626 | return 0; | |
627 | } | |
628 | fp = NULL; | |
629 | } | |
630 | fsp->xfer_len += seq_blen; /* premature count? */ | |
631 | return 0; | |
632 | } | |
633 | ||
634 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
635 | { | |
636 | int ba_done = 1; | |
637 | struct fc_ba_rjt *brp; | |
638 | struct fc_frame_header *fh; | |
639 | ||
640 | fh = fc_frame_header_get(fp); | |
641 | switch (fh->fh_r_ctl) { | |
642 | case FC_RCTL_BA_ACC: | |
643 | break; | |
644 | case FC_RCTL_BA_RJT: | |
645 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
646 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
647 | break; | |
648 | /* fall thru */ | |
649 | default: | |
650 | /* | |
651 | * we will let the command timeout | |
652 | * and scsi-ml recover in this case, | |
653 | * therefore cleared the ba_done flag. | |
654 | */ | |
655 | ba_done = 0; | |
656 | } | |
657 | ||
658 | if (ba_done) { | |
659 | fsp->state |= FC_SRB_ABORTED; | |
660 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
661 | ||
662 | if (fsp->wait_for_comp) | |
663 | complete(&fsp->tm_done); | |
664 | else | |
665 | fc_fcp_complete_locked(fsp); | |
666 | } | |
667 | } | |
668 | ||
34f42a07 RL |
669 | /** |
670 | * fc_fcp_reduce_can_queue() - drop can_queue | |
42e9a92f RL |
671 | * @lp: lport to drop queueing for |
672 | * | |
673 | * If we are getting memory allocation failures, then we may | |
674 | * be trying to execute too many commands. We let the running | |
675 | * commands complete or timeout, then try again with a reduced | |
676 | * can_queue. Eventually we will hit the point where we run | |
677 | * on all reserved structs. | |
678 | */ | |
679 | static void fc_fcp_reduce_can_queue(struct fc_lport *lp) | |
680 | { | |
681 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
682 | unsigned long flags; | |
683 | int can_queue; | |
684 | ||
685 | spin_lock_irqsave(lp->host->host_lock, flags); | |
686 | if (si->throttled) | |
687 | goto done; | |
688 | si->throttled = 1; | |
689 | ||
690 | can_queue = lp->host->can_queue; | |
691 | can_queue >>= 1; | |
692 | if (!can_queue) | |
693 | can_queue = 1; | |
694 | lp->host->can_queue = can_queue; | |
695 | shost_printk(KERN_ERR, lp->host, "Could not allocate frame.\n" | |
696 | "Reducing can_queue to %d.\n", can_queue); | |
697 | done: | |
698 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
699 | } | |
700 | ||
34f42a07 RL |
701 | /** |
702 | * fc_fcp_recv() - Reveive FCP frames | |
703 | * @seq: The sequence the frame is on | |
704 | * @fp: The FC frame | |
705 | * @arg: The related FCP packet | |
42e9a92f RL |
706 | * |
707 | * Return : None | |
708 | * Context : called from Soft IRQ context | |
709 | * can not called holding list lock | |
710 | */ | |
711 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
712 | { | |
713 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
714 | struct fc_lport *lp; | |
715 | struct fc_frame_header *fh; | |
716 | struct fcp_txrdy *dd; | |
717 | u8 r_ctl; | |
718 | int rc = 0; | |
719 | ||
720 | if (IS_ERR(fp)) | |
721 | goto errout; | |
722 | ||
723 | fh = fc_frame_header_get(fp); | |
724 | r_ctl = fh->fh_r_ctl; | |
725 | lp = fsp->lp; | |
726 | ||
727 | if (!(lp->state & LPORT_ST_READY)) | |
728 | goto out; | |
729 | if (fc_fcp_lock_pkt(fsp)) | |
730 | goto out; | |
731 | fsp->last_pkt_time = jiffies; | |
732 | ||
733 | if (fh->fh_type == FC_TYPE_BLS) { | |
734 | fc_fcp_abts_resp(fsp, fp); | |
735 | goto unlock; | |
736 | } | |
737 | ||
738 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
739 | goto unlock; | |
740 | ||
741 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
742 | /* | |
743 | * received XFER RDY from the target | |
744 | * need to send data to the target | |
745 | */ | |
746 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
747 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
748 | WARN_ON(!dd); | |
749 | ||
750 | rc = fc_fcp_send_data(fsp, seq, | |
751 | (size_t) ntohl(dd->ft_data_ro), | |
752 | (size_t) ntohl(dd->ft_burst_len)); | |
753 | if (!rc) | |
754 | seq->rec_data = fsp->xfer_len; | |
755 | else if (rc == -ENOMEM) | |
756 | fsp->state |= FC_SRB_NOMEM; | |
757 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { | |
758 | /* | |
759 | * received a DATA frame | |
760 | * next we will copy the data to the system buffer | |
761 | */ | |
762 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
763 | fc_fcp_recv_data(fsp, fp); | |
764 | seq->rec_data = fsp->xfer_contig_end; | |
765 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
766 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
767 | ||
768 | fc_fcp_resp(fsp, fp); | |
769 | } else { | |
770 | FC_DBG("unexpected frame. r_ctl %x\n", r_ctl); | |
771 | } | |
772 | unlock: | |
773 | fc_fcp_unlock_pkt(fsp); | |
774 | out: | |
775 | fc_frame_free(fp); | |
776 | errout: | |
777 | if (IS_ERR(fp)) | |
778 | fc_fcp_error(fsp, fp); | |
779 | else if (rc == -ENOMEM) | |
780 | fc_fcp_reduce_can_queue(lp); | |
781 | } | |
782 | ||
783 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
784 | { | |
785 | struct fc_frame_header *fh; | |
786 | struct fcp_resp *fc_rp; | |
787 | struct fcp_resp_ext *rp_ex; | |
788 | struct fcp_resp_rsp_info *fc_rp_info; | |
789 | u32 plen; | |
790 | u32 expected_len; | |
791 | u32 respl = 0; | |
792 | u32 snsl = 0; | |
793 | u8 flags = 0; | |
794 | ||
795 | plen = fr_len(fp); | |
796 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
797 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
798 | goto len_err; | |
799 | plen -= sizeof(*fh); | |
800 | fc_rp = (struct fcp_resp *)(fh + 1); | |
801 | fsp->cdb_status = fc_rp->fr_status; | |
802 | flags = fc_rp->fr_flags; | |
803 | fsp->scsi_comp_flags = flags; | |
804 | expected_len = fsp->data_len; | |
805 | ||
b277d2aa YZ |
806 | /* if ddp, update xfer len */ |
807 | fc_fcp_ddp_done(fsp); | |
808 | ||
42e9a92f RL |
809 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
810 | rp_ex = (void *)(fc_rp + 1); | |
811 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
812 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
813 | goto len_err; | |
814 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
815 | if (flags & FCP_RSP_LEN_VAL) { | |
816 | respl = ntohl(rp_ex->fr_rsp_len); | |
817 | if (respl != sizeof(*fc_rp_info)) | |
818 | goto len_err; | |
819 | if (fsp->wait_for_comp) { | |
820 | /* Abuse cdb_status for rsp code */ | |
821 | fsp->cdb_status = fc_rp_info->rsp_code; | |
822 | complete(&fsp->tm_done); | |
823 | /* | |
824 | * tmfs will not have any scsi cmd so | |
825 | * exit here | |
826 | */ | |
827 | return; | |
828 | } else | |
829 | goto err; | |
830 | } | |
831 | if (flags & FCP_SNS_LEN_VAL) { | |
832 | snsl = ntohl(rp_ex->fr_sns_len); | |
833 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
834 | snsl = SCSI_SENSE_BUFFERSIZE; | |
835 | memcpy(fsp->cmd->sense_buffer, | |
836 | (char *)fc_rp_info + respl, snsl); | |
837 | } | |
838 | } | |
839 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
840 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
841 | goto len_err; | |
842 | if (flags & FCP_RESID_UNDER) { | |
843 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
844 | /* | |
845 | * The cmnd->underflow is the minimum number of | |
846 | * bytes that must be transfered for this | |
847 | * command. Provided a sense condition is not | |
848 | * present, make sure the actual amount | |
849 | * transferred is at least the underflow value | |
850 | * or fail. | |
851 | */ | |
852 | if (!(flags & FCP_SNS_LEN_VAL) && | |
853 | (fc_rp->fr_status == 0) && | |
854 | (scsi_bufflen(fsp->cmd) - | |
855 | fsp->scsi_resid) < fsp->cmd->underflow) | |
856 | goto err; | |
857 | expected_len -= fsp->scsi_resid; | |
858 | } else { | |
859 | fsp->status_code = FC_ERROR; | |
860 | } | |
861 | } | |
862 | } | |
863 | fsp->state |= FC_SRB_RCV_STATUS; | |
864 | ||
865 | /* | |
866 | * Check for missing or extra data frames. | |
867 | */ | |
868 | if (unlikely(fsp->xfer_len != expected_len)) { | |
869 | if (fsp->xfer_len < expected_len) { | |
870 | /* | |
871 | * Some data may be queued locally, | |
872 | * Wait a at least one jiffy to see if it is delivered. | |
873 | * If this expires without data, we may do SRR. | |
874 | */ | |
875 | fc_fcp_timer_set(fsp, 2); | |
876 | return; | |
877 | } | |
878 | fsp->status_code = FC_DATA_OVRRUN; | |
879 | FC_DBG("tgt %6x xfer len %zx greater than expected len %x. " | |
880 | "data len %x\n", | |
881 | fsp->rport->port_id, | |
882 | fsp->xfer_len, expected_len, fsp->data_len); | |
883 | } | |
884 | fc_fcp_complete_locked(fsp); | |
885 | return; | |
886 | ||
887 | len_err: | |
888 | FC_DBG("short FCP response. flags 0x%x len %u respl %u snsl %u\n", | |
889 | flags, fr_len(fp), respl, snsl); | |
890 | err: | |
891 | fsp->status_code = FC_ERROR; | |
892 | fc_fcp_complete_locked(fsp); | |
893 | } | |
894 | ||
895 | /** | |
34f42a07 | 896 | * fc_fcp_complete_locked() - complete processing of a fcp packet |
42e9a92f RL |
897 | * @fsp: fcp packet |
898 | * | |
899 | * This function may sleep if a timer is pending. The packet lock must be | |
900 | * held, and the host lock must not be held. | |
901 | */ | |
902 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
903 | { | |
904 | struct fc_lport *lp = fsp->lp; | |
905 | struct fc_seq *seq; | |
906 | struct fc_exch *ep; | |
907 | u32 f_ctl; | |
908 | ||
909 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
910 | return; | |
911 | ||
912 | if (fsp->state & FC_SRB_ABORTED) { | |
913 | if (!fsp->status_code) | |
914 | fsp->status_code = FC_CMD_ABORTED; | |
915 | } else { | |
916 | /* | |
917 | * Test for transport underrun, independent of response | |
918 | * underrun status. | |
919 | */ | |
920 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
921 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
922 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
923 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 924 | fsp->io_status = 0; |
42e9a92f RL |
925 | } |
926 | } | |
927 | ||
928 | seq = fsp->seq_ptr; | |
929 | if (seq) { | |
930 | fsp->seq_ptr = NULL; | |
931 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
932 | struct fc_frame *conf_frame; | |
933 | struct fc_seq *csp; | |
934 | ||
935 | csp = lp->tt.seq_start_next(seq); | |
936 | conf_frame = fc_frame_alloc(fsp->lp, 0); | |
937 | if (conf_frame) { | |
938 | f_ctl = FC_FC_SEQ_INIT; | |
939 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
940 | ep = fc_seq_exch(seq); | |
941 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
942 | ep->did, ep->sid, | |
943 | FC_TYPE_FCP, f_ctl, 0); | |
944 | lp->tt.seq_send(lp, csp, conf_frame); | |
945 | } | |
946 | } | |
947 | lp->tt.exch_done(seq); | |
948 | } | |
949 | fc_io_compl(fsp); | |
950 | } | |
951 | ||
952 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) | |
953 | { | |
954 | struct fc_lport *lp = fsp->lp; | |
955 | ||
956 | if (fsp->seq_ptr) { | |
957 | lp->tt.exch_done(fsp->seq_ptr); | |
958 | fsp->seq_ptr = NULL; | |
959 | } | |
960 | fsp->status_code = error; | |
961 | } | |
962 | ||
963 | /** | |
34f42a07 | 964 | * fc_fcp_cleanup_each_cmd() - Cleanup active commads |
42e9a92f RL |
965 | * @lp: logical port |
966 | * @id: target id | |
967 | * @lun: lun | |
968 | * @error: fsp status code | |
969 | * | |
970 | * If lun or id is -1, they are ignored. | |
971 | */ | |
972 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id, | |
973 | unsigned int lun, int error) | |
974 | { | |
975 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
976 | struct fc_fcp_pkt *fsp; | |
977 | struct scsi_cmnd *sc_cmd; | |
978 | unsigned long flags; | |
979 | ||
980 | spin_lock_irqsave(lp->host->host_lock, flags); | |
981 | restart: | |
982 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
983 | sc_cmd = fsp->cmd; | |
984 | if (id != -1 && scmd_id(sc_cmd) != id) | |
985 | continue; | |
986 | ||
987 | if (lun != -1 && sc_cmd->device->lun != lun) | |
988 | continue; | |
989 | ||
990 | fc_fcp_pkt_hold(fsp); | |
991 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
992 | ||
993 | if (!fc_fcp_lock_pkt(fsp)) { | |
994 | fc_fcp_cleanup_cmd(fsp, error); | |
995 | fc_io_compl(fsp); | |
996 | fc_fcp_unlock_pkt(fsp); | |
997 | } | |
998 | ||
999 | fc_fcp_pkt_release(fsp); | |
1000 | spin_lock_irqsave(lp->host->host_lock, flags); | |
1001 | /* | |
1002 | * while we dropped the lock multiple pkts could | |
1003 | * have been released, so we have to start over. | |
1004 | */ | |
1005 | goto restart; | |
1006 | } | |
1007 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1008 | } | |
1009 | ||
1010 | static void fc_fcp_abort_io(struct fc_lport *lp) | |
1011 | { | |
1012 | fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR); | |
1013 | } | |
1014 | ||
1015 | /** | |
34f42a07 | 1016 | * fc_fcp_pkt_send() - send a fcp packet to the lower level. |
42e9a92f RL |
1017 | * @lp: fc lport |
1018 | * @fsp: fc packet. | |
1019 | * | |
1020 | * This is called by upper layer protocol. | |
1021 | * Return : zero for success and -1 for failure | |
1022 | * Context : called from queuecommand which can be called from process | |
1023 | * or scsi soft irq. | |
1024 | * Locks : called with the host lock and irqs disabled. | |
1025 | */ | |
1026 | static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp) | |
1027 | { | |
1028 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
1029 | int rc; | |
1030 | ||
1031 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1032 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1033 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1034 | ||
1035 | int_to_scsilun(fsp->cmd->device->lun, | |
1036 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1037 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
1038 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1039 | ||
1040 | spin_unlock_irq(lp->host->host_lock); | |
1041 | rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv); | |
1042 | spin_lock_irq(lp->host->host_lock); | |
1043 | if (rc) | |
1044 | list_del(&fsp->list); | |
1045 | ||
1046 | return rc; | |
1047 | } | |
1048 | ||
1049 | static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp, | |
1050 | void (*resp)(struct fc_seq *, | |
1051 | struct fc_frame *fp, | |
1052 | void *arg)) | |
1053 | { | |
1054 | struct fc_frame *fp; | |
1055 | struct fc_seq *seq; | |
1056 | struct fc_rport *rport; | |
1057 | struct fc_rport_libfc_priv *rp; | |
1058 | const size_t len = sizeof(fsp->cdb_cmd); | |
1059 | int rc = 0; | |
1060 | ||
1061 | if (fc_fcp_lock_pkt(fsp)) | |
1062 | return 0; | |
1063 | ||
1064 | fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd)); | |
1065 | if (!fp) { | |
1066 | rc = -1; | |
1067 | goto unlock; | |
1068 | } | |
1069 | ||
1070 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1071 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1072 | rport = fsp->rport; |
1073 | fsp->max_payload = rport->maxframe_size; | |
1074 | rp = rport->dd_data; | |
1075 | ||
1076 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
1077 | fc_host_port_id(rp->local_port->host), FC_TYPE_FCP, | |
1078 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
1079 | ||
1080 | seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0); | |
1081 | if (!seq) { | |
1082 | fc_frame_free(fp); | |
1083 | rc = -1; | |
1084 | goto unlock; | |
1085 | } | |
1086 | fsp->last_pkt_time = jiffies; | |
1087 | fsp->seq_ptr = seq; | |
1088 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1089 | ||
1090 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); | |
1091 | fc_fcp_timer_set(fsp, | |
1092 | (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? | |
1093 | FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); | |
1094 | unlock: | |
1095 | fc_fcp_unlock_pkt(fsp); | |
1096 | return rc; | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * transport error handler | |
1101 | */ | |
1102 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1103 | { | |
1104 | int error = PTR_ERR(fp); | |
1105 | ||
1106 | if (fc_fcp_lock_pkt(fsp)) | |
1107 | return; | |
1108 | ||
1109 | switch (error) { | |
1110 | case -FC_EX_CLOSED: | |
1111 | fc_fcp_retry_cmd(fsp); | |
1112 | goto unlock; | |
1113 | default: | |
1114 | FC_DBG("unknown error %ld\n", PTR_ERR(fp)); | |
1115 | } | |
1116 | /* | |
1117 | * clear abort pending, because the lower layer | |
1118 | * decided to force completion. | |
1119 | */ | |
1120 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1121 | fsp->status_code = FC_CMD_PLOGO; | |
1122 | fc_fcp_complete_locked(fsp); | |
1123 | unlock: | |
1124 | fc_fcp_unlock_pkt(fsp); | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Scsi abort handler- calls to send an abort | |
1129 | * and then wait for abort completion | |
1130 | */ | |
1131 | static int fc_fcp_pkt_abort(struct fc_lport *lp, struct fc_fcp_pkt *fsp) | |
1132 | { | |
1133 | int rc = FAILED; | |
1134 | ||
1135 | if (fc_fcp_send_abort(fsp)) | |
1136 | return FAILED; | |
1137 | ||
1138 | init_completion(&fsp->tm_done); | |
1139 | fsp->wait_for_comp = 1; | |
1140 | ||
1141 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1142 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1143 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1144 | fsp->wait_for_comp = 0; | |
1145 | ||
1146 | if (!rc) { | |
1147 | FC_DBG("target abort cmd failed\n"); | |
1148 | rc = FAILED; | |
1149 | } else if (fsp->state & FC_SRB_ABORTED) { | |
1150 | FC_DBG("target abort cmd passed\n"); | |
1151 | rc = SUCCESS; | |
1152 | fc_fcp_complete_locked(fsp); | |
1153 | } | |
1154 | ||
1155 | return rc; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * Retry LUN reset after resource allocation failed. | |
1160 | */ | |
1161 | static void fc_lun_reset_send(unsigned long data) | |
1162 | { | |
1163 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1164 | struct fc_lport *lp = fsp->lp; | |
1165 | if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) { | |
1166 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) | |
1167 | return; | |
1168 | if (fc_fcp_lock_pkt(fsp)) | |
1169 | return; | |
1170 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); | |
1171 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1172 | fc_fcp_unlock_pkt(fsp); | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Scsi device reset handler- send a LUN RESET to the device | |
1178 | * and wait for reset reply | |
1179 | */ | |
1180 | static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp, | |
1181 | unsigned int id, unsigned int lun) | |
1182 | { | |
1183 | int rc; | |
1184 | ||
1185 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1186 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1187 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1188 | ||
1189 | fsp->wait_for_comp = 1; | |
1190 | init_completion(&fsp->tm_done); | |
1191 | ||
1192 | fc_lun_reset_send((unsigned long)fsp); | |
1193 | ||
1194 | /* | |
1195 | * wait for completion of reset | |
1196 | * after that make sure all commands are terminated | |
1197 | */ | |
1198 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1199 | ||
1200 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1201 | fsp->state |= FC_SRB_COMPL; | |
1202 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1203 | ||
1204 | del_timer_sync(&fsp->timer); | |
1205 | ||
1206 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1207 | if (fsp->seq_ptr) { | |
1208 | lp->tt.exch_done(fsp->seq_ptr); | |
1209 | fsp->seq_ptr = NULL; | |
1210 | } | |
1211 | fsp->wait_for_comp = 0; | |
1212 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1213 | ||
1214 | if (!rc) { | |
1215 | FC_DBG("lun reset failed\n"); | |
1216 | return FAILED; | |
1217 | } | |
1218 | ||
1219 | /* cdb_status holds the tmf's rsp code */ | |
1220 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1221 | return FAILED; | |
1222 | ||
1223 | FC_DBG("lun reset to lun %u completed\n", lun); | |
1224 | fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED); | |
1225 | return SUCCESS; | |
1226 | } | |
1227 | ||
1228 | /* | |
1229 | * Task Managment response handler | |
1230 | */ | |
1231 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1232 | { | |
1233 | struct fc_fcp_pkt *fsp = arg; | |
1234 | struct fc_frame_header *fh; | |
1235 | ||
1236 | if (IS_ERR(fp)) { | |
1237 | /* | |
1238 | * If there is an error just let it timeout or wait | |
1239 | * for TMF to be aborted if it timedout. | |
1240 | * | |
1241 | * scsi-eh will escalate for when either happens. | |
1242 | */ | |
1243 | return; | |
1244 | } | |
1245 | ||
1246 | if (fc_fcp_lock_pkt(fsp)) | |
1247 | return; | |
1248 | ||
1249 | /* | |
1250 | * raced with eh timeout handler. | |
1251 | */ | |
1252 | if (!fsp->seq_ptr || !fsp->wait_for_comp) { | |
1253 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1254 | return; | |
1255 | } | |
1256 | ||
1257 | fh = fc_frame_header_get(fp); | |
1258 | if (fh->fh_type != FC_TYPE_BLS) | |
1259 | fc_fcp_resp(fsp, fp); | |
1260 | fsp->seq_ptr = NULL; | |
1261 | fsp->lp->tt.exch_done(seq); | |
1262 | fc_frame_free(fp); | |
1263 | fc_fcp_unlock_pkt(fsp); | |
1264 | } | |
1265 | ||
1266 | static void fc_fcp_cleanup(struct fc_lport *lp) | |
1267 | { | |
1268 | fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR); | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * fc_fcp_timeout: called by OS timer function. | |
1273 | * | |
1274 | * The timer has been inactivated and must be reactivated if desired | |
1275 | * using fc_fcp_timer_set(). | |
1276 | * | |
1277 | * Algorithm: | |
1278 | * | |
1279 | * If REC is supported, just issue it, and return. The REC exchange will | |
1280 | * complete or time out, and recovery can continue at that point. | |
1281 | * | |
1282 | * Otherwise, if the response has been received without all the data, | |
1283 | * it has been ER_TIMEOUT since the response was received. | |
1284 | * | |
1285 | * If the response has not been received, | |
1286 | * we see if data was received recently. If it has been, we continue waiting, | |
1287 | * otherwise, we abort the command. | |
1288 | */ | |
1289 | static void fc_fcp_timeout(unsigned long data) | |
1290 | { | |
1291 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1292 | struct fc_rport *rport = fsp->rport; | |
1293 | struct fc_rport_libfc_priv *rp = rport->dd_data; | |
1294 | ||
1295 | if (fc_fcp_lock_pkt(fsp)) | |
1296 | return; | |
1297 | ||
1298 | if (fsp->cdb_cmd.fc_tm_flags) | |
1299 | goto unlock; | |
1300 | ||
1301 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1302 | ||
1303 | if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED) | |
1304 | fc_fcp_rec(fsp); | |
1305 | else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), | |
1306 | jiffies)) | |
1307 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); | |
1308 | else if (fsp->state & FC_SRB_RCV_STATUS) | |
1309 | fc_fcp_complete_locked(fsp); | |
1310 | else | |
1311 | fc_timeout_error(fsp); | |
1312 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; | |
1313 | unlock: | |
1314 | fc_fcp_unlock_pkt(fsp); | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Send a REC ELS request | |
1319 | */ | |
1320 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1321 | { | |
1322 | struct fc_lport *lp; | |
1323 | struct fc_frame *fp; | |
1324 | struct fc_rport *rport; | |
1325 | struct fc_rport_libfc_priv *rp; | |
1326 | ||
1327 | lp = fsp->lp; | |
1328 | rport = fsp->rport; | |
1329 | rp = rport->dd_data; | |
1330 | if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) { | |
1331 | fsp->status_code = FC_HRD_ERROR; | |
1c9fbafc | 1332 | fsp->io_status = 0; |
42e9a92f RL |
1333 | fc_fcp_complete_locked(fsp); |
1334 | return; | |
1335 | } | |
1336 | fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec)); | |
1337 | if (!fp) | |
1338 | goto retry; | |
1339 | ||
1340 | fr_seq(fp) = fsp->seq_ptr; | |
1341 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
1342 | fc_host_port_id(rp->local_port->host), FC_TYPE_ELS, | |
1343 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
1344 | if (lp->tt.elsct_send(lp, rport, fp, ELS_REC, fc_fcp_rec_resp, | |
1345 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) { | |
1346 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ | |
1347 | return; | |
1348 | } | |
1349 | fc_frame_free(fp); | |
1350 | retry: | |
1351 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1352 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1353 | else | |
1354 | fc_timeout_error(fsp); | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Receive handler for REC ELS frame | |
1359 | * if it is a reject then let the scsi layer to handle | |
1360 | * the timeout. if it is a LS_ACC then if the io was not completed | |
1361 | * then set the timeout and return otherwise complete the exchange | |
1362 | * and tell the scsi layer to restart the I/O. | |
1363 | */ | |
1364 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1365 | { | |
1366 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1367 | struct fc_els_rec_acc *recp; | |
1368 | struct fc_els_ls_rjt *rjt; | |
1369 | u32 e_stat; | |
1370 | u8 opcode; | |
1371 | u32 offset; | |
1372 | enum dma_data_direction data_dir; | |
1373 | enum fc_rctl r_ctl; | |
1374 | struct fc_rport_libfc_priv *rp; | |
1375 | ||
1376 | if (IS_ERR(fp)) { | |
1377 | fc_fcp_rec_error(fsp, fp); | |
1378 | return; | |
1379 | } | |
1380 | ||
1381 | if (fc_fcp_lock_pkt(fsp)) | |
1382 | goto out; | |
1383 | ||
1384 | fsp->recov_retry = 0; | |
1385 | opcode = fc_frame_payload_op(fp); | |
1386 | if (opcode == ELS_LS_RJT) { | |
1387 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1388 | switch (rjt->er_reason) { | |
1389 | default: | |
1390 | FC_DEBUG_FCP("device %x unexpected REC reject " | |
1391 | "reason %d expl %d\n", | |
1392 | fsp->rport->port_id, rjt->er_reason, | |
1393 | rjt->er_explan); | |
1394 | /* fall through */ | |
1395 | case ELS_RJT_UNSUP: | |
1396 | FC_DEBUG_FCP("device does not support REC\n"); | |
1397 | rp = fsp->rport->dd_data; | |
1398 | /* | |
1399 | * if we do not spport RECs or got some bogus | |
1400 | * reason then resetup timer so we check for | |
1401 | * making progress. | |
1402 | */ | |
1403 | rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; | |
1404 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); | |
1405 | break; | |
1406 | case ELS_RJT_LOGIC: | |
1407 | case ELS_RJT_UNAB: | |
1408 | /* | |
1409 | * If no data transfer, the command frame got dropped | |
1410 | * so we just retry. If data was transferred, we | |
1411 | * lost the response but the target has no record, | |
1412 | * so we abort and retry. | |
1413 | */ | |
1414 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1415 | fsp->xfer_len == 0) { | |
1416 | fc_fcp_retry_cmd(fsp); | |
1417 | break; | |
1418 | } | |
1419 | fc_timeout_error(fsp); | |
1420 | break; | |
1421 | } | |
1422 | } else if (opcode == ELS_LS_ACC) { | |
1423 | if (fsp->state & FC_SRB_ABORTED) | |
1424 | goto unlock_out; | |
1425 | ||
1426 | data_dir = fsp->cmd->sc_data_direction; | |
1427 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1428 | offset = ntohl(recp->reca_fc4value); | |
1429 | e_stat = ntohl(recp->reca_e_stat); | |
1430 | ||
1431 | if (e_stat & ESB_ST_COMPLETE) { | |
1432 | ||
1433 | /* | |
1434 | * The exchange is complete. | |
1435 | * | |
1436 | * For output, we must've lost the response. | |
1437 | * For input, all data must've been sent. | |
1438 | * We lost may have lost the response | |
1439 | * (and a confirmation was requested) and maybe | |
1440 | * some data. | |
1441 | * | |
1442 | * If all data received, send SRR | |
1443 | * asking for response. If partial data received, | |
1444 | * or gaps, SRR requests data at start of gap. | |
1445 | * Recovery via SRR relies on in-order-delivery. | |
1446 | */ | |
1447 | if (data_dir == DMA_TO_DEVICE) { | |
1448 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1449 | } else if (fsp->xfer_contig_end == offset) { | |
1450 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1451 | } else { | |
1452 | offset = fsp->xfer_contig_end; | |
1453 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1454 | } | |
1455 | fc_fcp_srr(fsp, r_ctl, offset); | |
1456 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
1457 | ||
1458 | /* | |
1459 | * The remote port has the initiative, so just | |
1460 | * keep waiting for it to complete. | |
1461 | */ | |
1462 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1463 | } else { | |
1464 | ||
1465 | /* | |
1466 | * The exchange is incomplete, we have seq. initiative. | |
1467 | * Lost response with requested confirmation, | |
1468 | * lost confirmation, lost transfer ready or | |
1469 | * lost write data. | |
1470 | * | |
1471 | * For output, if not all data was received, ask | |
1472 | * for transfer ready to be repeated. | |
1473 | * | |
1474 | * If we received or sent all the data, send SRR to | |
1475 | * request response. | |
1476 | * | |
1477 | * If we lost a response, we may have lost some read | |
1478 | * data as well. | |
1479 | */ | |
1480 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1481 | if (data_dir == DMA_TO_DEVICE) { | |
1482 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1483 | if (offset < fsp->data_len) | |
1484 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1485 | } else if (offset == fsp->xfer_contig_end) { | |
1486 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1487 | } else if (fsp->xfer_contig_end < offset) { | |
1488 | offset = fsp->xfer_contig_end; | |
1489 | } | |
1490 | fc_fcp_srr(fsp, r_ctl, offset); | |
1491 | } | |
1492 | } | |
1493 | unlock_out: | |
1494 | fc_fcp_unlock_pkt(fsp); | |
1495 | out: | |
1496 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1497 | fc_frame_free(fp); | |
1498 | } | |
1499 | ||
1500 | /* | |
1501 | * Handle error response or timeout for REC exchange. | |
1502 | */ | |
1503 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1504 | { | |
1505 | int error = PTR_ERR(fp); | |
1506 | ||
1507 | if (fc_fcp_lock_pkt(fsp)) | |
1508 | goto out; | |
1509 | ||
1510 | switch (error) { | |
1511 | case -FC_EX_CLOSED: | |
1512 | fc_fcp_retry_cmd(fsp); | |
1513 | break; | |
1514 | ||
1515 | default: | |
1516 | FC_DBG("REC %p fid %x error unexpected error %d\n", | |
1517 | fsp, fsp->rport->port_id, error); | |
1518 | fsp->status_code = FC_CMD_PLOGO; | |
1519 | /* fall through */ | |
1520 | ||
1521 | case -FC_EX_TIMEOUT: | |
1522 | /* | |
1523 | * Assume REC or LS_ACC was lost. | |
1524 | * The exchange manager will have aborted REC, so retry. | |
1525 | */ | |
1526 | FC_DBG("REC fid %x error error %d retry %d/%d\n", | |
1527 | fsp->rport->port_id, error, fsp->recov_retry, | |
1528 | FC_MAX_RECOV_RETRY); | |
1529 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1530 | fc_fcp_rec(fsp); | |
1531 | else | |
1532 | fc_timeout_error(fsp); | |
1533 | break; | |
1534 | } | |
1535 | fc_fcp_unlock_pkt(fsp); | |
1536 | out: | |
1537 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * Time out error routine: | |
1542 | * abort's the I/O close the exchange and | |
1543 | * send completion notification to scsi layer | |
1544 | */ | |
1545 | static void fc_timeout_error(struct fc_fcp_pkt *fsp) | |
1546 | { | |
1547 | fsp->status_code = FC_CMD_TIME_OUT; | |
1548 | fsp->cdb_status = 0; | |
1549 | fsp->io_status = 0; | |
1550 | /* | |
1551 | * if this fails then we let the scsi command timer fire and | |
1552 | * scsi-ml escalate. | |
1553 | */ | |
1554 | fc_fcp_send_abort(fsp); | |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * Sequence retransmission request. | |
1559 | * This is called after receiving status but insufficient data, or | |
1560 | * when expecting status but the request has timed out. | |
1561 | */ | |
1562 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1563 | { | |
1564 | struct fc_lport *lp = fsp->lp; | |
1565 | struct fc_rport *rport; | |
1566 | struct fc_rport_libfc_priv *rp; | |
1567 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); | |
1568 | struct fc_seq *seq; | |
1569 | struct fcp_srr *srr; | |
1570 | struct fc_frame *fp; | |
1571 | u8 cdb_op; | |
1572 | ||
1573 | rport = fsp->rport; | |
1574 | rp = rport->dd_data; | |
1575 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; | |
1576 | ||
1577 | if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY) | |
1578 | goto retry; /* shouldn't happen */ | |
1579 | fp = fc_frame_alloc(lp, sizeof(*srr)); | |
1580 | if (!fp) | |
1581 | goto retry; | |
1582 | ||
1583 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1584 | memset(srr, 0, sizeof(*srr)); | |
1585 | srr->srr_op = ELS_SRR; | |
1586 | srr->srr_ox_id = htons(ep->oxid); | |
1587 | srr->srr_rx_id = htons(ep->rxid); | |
1588 | srr->srr_r_ctl = r_ctl; | |
1589 | srr->srr_rel_off = htonl(offset); | |
1590 | ||
1591 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
1592 | fc_host_port_id(rp->local_port->host), FC_TYPE_FCP, | |
1593 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
1594 | ||
1595 | seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL, | |
1596 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); | |
1597 | if (!seq) { | |
1598 | fc_frame_free(fp); | |
1599 | goto retry; | |
1600 | } | |
1601 | fsp->recov_seq = seq; | |
1602 | fsp->xfer_len = offset; | |
1603 | fsp->xfer_contig_end = offset; | |
1604 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1605 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1606 | return; | |
1607 | retry: | |
1608 | fc_fcp_retry_cmd(fsp); | |
1609 | } | |
1610 | ||
1611 | /* | |
1612 | * Handle response from SRR. | |
1613 | */ | |
1614 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1615 | { | |
1616 | struct fc_fcp_pkt *fsp = arg; | |
1617 | struct fc_frame_header *fh; | |
1618 | ||
1619 | if (IS_ERR(fp)) { | |
1620 | fc_fcp_srr_error(fsp, fp); | |
1621 | return; | |
1622 | } | |
1623 | ||
1624 | if (fc_fcp_lock_pkt(fsp)) | |
1625 | goto out; | |
1626 | ||
1627 | fh = fc_frame_header_get(fp); | |
1628 | /* | |
1629 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1630 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1631 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1632 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1633 | * an abort response though. | |
1634 | */ | |
1635 | if (fh->fh_type == FC_TYPE_BLS) { | |
1636 | fc_fcp_unlock_pkt(fsp); | |
1637 | return; | |
1638 | } | |
1639 | ||
1640 | fsp->recov_seq = NULL; | |
1641 | switch (fc_frame_payload_op(fp)) { | |
1642 | case ELS_LS_ACC: | |
1643 | fsp->recov_retry = 0; | |
1644 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1645 | break; | |
1646 | case ELS_LS_RJT: | |
1647 | default: | |
1648 | fc_timeout_error(fsp); | |
1649 | break; | |
1650 | } | |
1651 | fc_fcp_unlock_pkt(fsp); | |
1652 | fsp->lp->tt.exch_done(seq); | |
1653 | out: | |
1654 | fc_frame_free(fp); | |
1655 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1656 | } | |
1657 | ||
1658 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1659 | { | |
1660 | if (fc_fcp_lock_pkt(fsp)) | |
1661 | goto out; | |
1662 | fsp->lp->tt.exch_done(fsp->recov_seq); | |
1663 | fsp->recov_seq = NULL; | |
1664 | switch (PTR_ERR(fp)) { | |
1665 | case -FC_EX_TIMEOUT: | |
1666 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1667 | fc_fcp_rec(fsp); | |
1668 | else | |
1669 | fc_timeout_error(fsp); | |
1670 | break; | |
1671 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1672 | /* fall through */ | |
1673 | default: | |
1674 | fc_fcp_retry_cmd(fsp); | |
1675 | break; | |
1676 | } | |
1677 | fc_fcp_unlock_pkt(fsp); | |
1678 | out: | |
1679 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1680 | } | |
1681 | ||
1682 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp) | |
1683 | { | |
1684 | /* lock ? */ | |
bc0e17f6 | 1685 | return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull; |
42e9a92f RL |
1686 | } |
1687 | ||
1688 | /** | |
1689 | * fc_queuecommand - The queuecommand function of the scsi template | |
1690 | * @cmd: struct scsi_cmnd to be executed | |
1691 | * @done: Callback function to be called when cmd is completed | |
1692 | * | |
1693 | * this is the i/o strategy routine, called by the scsi layer | |
1694 | * this routine is called with holding the host_lock. | |
1695 | */ | |
1696 | int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) | |
1697 | { | |
1698 | struct fc_lport *lp; | |
1699 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
1700 | struct fc_fcp_pkt *fsp; | |
1701 | struct fc_rport_libfc_priv *rp; | |
1702 | int rval; | |
1703 | int rc = 0; | |
1704 | struct fcoe_dev_stats *stats; | |
1705 | ||
1706 | lp = shost_priv(sc_cmd->device->host); | |
1707 | ||
1708 | rval = fc_remote_port_chkready(rport); | |
1709 | if (rval) { | |
1710 | sc_cmd->result = rval; | |
1711 | done(sc_cmd); | |
1712 | goto out; | |
1713 | } | |
1714 | ||
1715 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1716 | /* | |
1717 | * rport is transitioning from blocked/deleted to | |
1718 | * online | |
1719 | */ | |
1720 | sc_cmd->result = DID_IMM_RETRY << 16; | |
1721 | done(sc_cmd); | |
1722 | goto out; | |
1723 | } | |
1724 | ||
1725 | rp = rport->dd_data; | |
1726 | ||
1727 | if (!fc_fcp_lport_queue_ready(lp)) { | |
1728 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1729 | goto out; | |
1730 | } | |
1731 | ||
1732 | fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC); | |
1733 | if (fsp == NULL) { | |
1734 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1735 | goto out; | |
1736 | } | |
1737 | ||
1738 | /* | |
1739 | * build the libfc request pkt | |
1740 | */ | |
1741 | fsp->cmd = sc_cmd; /* save the cmd */ | |
1742 | fsp->lp = lp; /* save the softc ptr */ | |
1743 | fsp->rport = rport; /* set the remote port ptr */ | |
1744 | sc_cmd->scsi_done = done; | |
1745 | ||
1746 | /* | |
1747 | * set up the transfer length | |
1748 | */ | |
1749 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1750 | fsp->xfer_len = 0; | |
1751 | ||
1752 | /* | |
1753 | * setup the data direction | |
1754 | */ | |
1755 | stats = lp->dev_stats[smp_processor_id()]; | |
1756 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { | |
1757 | fsp->req_flags = FC_SRB_READ; | |
1758 | stats->InputRequests++; | |
1759 | stats->InputMegabytes = fsp->data_len; | |
1760 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { | |
1761 | fsp->req_flags = FC_SRB_WRITE; | |
1762 | stats->OutputRequests++; | |
1763 | stats->OutputMegabytes = fsp->data_len; | |
1764 | } else { | |
1765 | fsp->req_flags = 0; | |
1766 | stats->ControlRequests++; | |
1767 | } | |
1768 | ||
1769 | fsp->tgt_flags = rp->flags; | |
1770 | ||
1771 | init_timer(&fsp->timer); | |
1772 | fsp->timer.data = (unsigned long)fsp; | |
1773 | ||
1774 | /* | |
1775 | * send it to the lower layer | |
1776 | * if we get -1 return then put the request in the pending | |
1777 | * queue. | |
1778 | */ | |
1779 | rval = fc_fcp_pkt_send(lp, fsp); | |
1780 | if (rval != 0) { | |
1781 | fsp->state = FC_SRB_FREE; | |
1782 | fc_fcp_pkt_release(fsp); | |
1783 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1784 | } | |
1785 | out: | |
1786 | return rc; | |
1787 | } | |
1788 | EXPORT_SYMBOL(fc_queuecommand); | |
1789 | ||
1790 | /** | |
34f42a07 | 1791 | * fc_io_compl() - Handle responses for completed commands |
42e9a92f RL |
1792 | * @fsp: scsi packet |
1793 | * | |
1794 | * Translates a error to a Linux SCSI error. | |
1795 | * | |
1796 | * The fcp packet lock must be held when calling. | |
1797 | */ | |
1798 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1799 | { | |
1800 | struct fc_fcp_internal *si; | |
1801 | struct scsi_cmnd *sc_cmd; | |
1802 | struct fc_lport *lp; | |
1803 | unsigned long flags; | |
1804 | ||
b277d2aa YZ |
1805 | /* release outstanding ddp context */ |
1806 | fc_fcp_ddp_done(fsp); | |
1807 | ||
42e9a92f RL |
1808 | fsp->state |= FC_SRB_COMPL; |
1809 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1810 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1811 | del_timer_sync(&fsp->timer); | |
1812 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1813 | } | |
1814 | ||
1815 | lp = fsp->lp; | |
1816 | si = fc_get_scsi_internal(lp); | |
1817 | spin_lock_irqsave(lp->host->host_lock, flags); | |
1818 | if (!fsp->cmd) { | |
1819 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1820 | return; | |
1821 | } | |
1822 | ||
1823 | /* | |
1824 | * if a command timed out while we had to try and throttle IO | |
1825 | * and it is now getting cleaned up, then we are about to | |
1826 | * try again so clear the throttled flag incase we get more | |
1827 | * time outs. | |
1828 | */ | |
1829 | if (si->throttled && fsp->state & FC_SRB_NOMEM) | |
1830 | si->throttled = 0; | |
1831 | ||
1832 | sc_cmd = fsp->cmd; | |
1833 | fsp->cmd = NULL; | |
1834 | ||
1835 | if (!sc_cmd->SCp.ptr) { | |
1836 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1837 | return; | |
1838 | } | |
1839 | ||
1840 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; | |
1841 | switch (fsp->status_code) { | |
1842 | case FC_COMPLETE: | |
1843 | if (fsp->cdb_status == 0) { | |
1844 | /* | |
1845 | * good I/O status | |
1846 | */ | |
1847 | sc_cmd->result = DID_OK << 16; | |
1848 | if (fsp->scsi_resid) | |
1849 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
1850 | } else if (fsp->cdb_status == QUEUE_FULL) { | |
1851 | struct scsi_device *tmp_sdev; | |
1852 | struct scsi_device *sdev = sc_cmd->device; | |
1853 | ||
1854 | shost_for_each_device(tmp_sdev, sdev->host) { | |
1855 | if (tmp_sdev->id != sdev->id) | |
1856 | continue; | |
1857 | ||
1858 | if (tmp_sdev->queue_depth > 1) { | |
1859 | scsi_track_queue_full(tmp_sdev, | |
1860 | tmp_sdev-> | |
1861 | queue_depth - 1); | |
1862 | } | |
1863 | } | |
1864 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1865 | } else { | |
1866 | /* | |
1867 | * transport level I/O was ok but scsi | |
1868 | * has non zero status | |
1869 | */ | |
1870 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1871 | } | |
1872 | break; | |
1873 | case FC_ERROR: | |
1874 | sc_cmd->result = DID_ERROR << 16; | |
1875 | break; | |
1876 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1877 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1878 | /* |
1879 | * scsi status is good but transport level | |
26d9cab5 | 1880 | * underrun. |
42e9a92f | 1881 | */ |
26d9cab5 | 1882 | sc_cmd->result = DID_OK << 16; |
42e9a92f RL |
1883 | } else { |
1884 | /* | |
1885 | * scsi got underrun, this is an error | |
1886 | */ | |
1887 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
1888 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1889 | } | |
1890 | break; | |
1891 | case FC_DATA_OVRRUN: | |
1892 | /* | |
1893 | * overrun is an error | |
1894 | */ | |
1895 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1896 | break; | |
1897 | case FC_CMD_ABORTED: | |
1898 | sc_cmd->result = (DID_ABORT << 16) | fsp->io_status; | |
1899 | break; | |
1900 | case FC_CMD_TIME_OUT: | |
1901 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
1902 | break; | |
1903 | case FC_CMD_RESET: | |
1904 | sc_cmd->result = (DID_RESET << 16); | |
1905 | break; | |
1906 | case FC_HRD_ERROR: | |
1907 | sc_cmd->result = (DID_NO_CONNECT << 16); | |
1908 | break; | |
1909 | default: | |
1910 | sc_cmd->result = (DID_ERROR << 16); | |
1911 | break; | |
1912 | } | |
1913 | ||
1914 | list_del(&fsp->list); | |
1915 | sc_cmd->SCp.ptr = NULL; | |
1916 | sc_cmd->scsi_done(sc_cmd); | |
1917 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1918 | ||
1919 | /* release ref from initial allocation in queue command */ | |
1920 | fc_fcp_pkt_release(fsp); | |
1921 | } | |
1922 | ||
1923 | /** | |
34f42a07 | 1924 | * fc_fcp_complete() - complete processing of a fcp packet |
42e9a92f RL |
1925 | * @fsp: fcp packet |
1926 | * | |
1927 | * This function may sleep if a fsp timer is pending. | |
1928 | * The host lock must not be held by caller. | |
1929 | */ | |
1930 | void fc_fcp_complete(struct fc_fcp_pkt *fsp) | |
1931 | { | |
1932 | if (fc_fcp_lock_pkt(fsp)) | |
1933 | return; | |
1934 | ||
1935 | fc_fcp_complete_locked(fsp); | |
1936 | fc_fcp_unlock_pkt(fsp); | |
1937 | } | |
1938 | EXPORT_SYMBOL(fc_fcp_complete); | |
1939 | ||
1940 | /** | |
34f42a07 | 1941 | * fc_eh_abort() - Abort a command |
42e9a92f RL |
1942 | * @sc_cmd: scsi command to abort |
1943 | * | |
34f42a07 | 1944 | * From scsi host template. |
42e9a92f RL |
1945 | * send ABTS to the target device and wait for the response |
1946 | * sc_cmd is the pointer to the command to be aborted. | |
1947 | */ | |
1948 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
1949 | { | |
1950 | struct fc_fcp_pkt *fsp; | |
1951 | struct fc_lport *lp; | |
1952 | int rc = FAILED; | |
1953 | unsigned long flags; | |
1954 | ||
1955 | lp = shost_priv(sc_cmd->device->host); | |
1956 | if (lp->state != LPORT_ST_READY) | |
1957 | return rc; | |
bc0e17f6 | 1958 | else if (!lp->link_up) |
42e9a92f RL |
1959 | return rc; |
1960 | ||
1961 | spin_lock_irqsave(lp->host->host_lock, flags); | |
1962 | fsp = CMD_SP(sc_cmd); | |
1963 | if (!fsp) { | |
1964 | /* command completed while scsi eh was setting up */ | |
1965 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1966 | return SUCCESS; | |
1967 | } | |
1968 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
1969 | fc_fcp_pkt_hold(fsp); | |
1970 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1971 | ||
1972 | if (fc_fcp_lock_pkt(fsp)) { | |
1973 | /* completed while we were waiting for timer to be deleted */ | |
1974 | rc = SUCCESS; | |
1975 | goto release_pkt; | |
1976 | } | |
1977 | ||
1978 | rc = fc_fcp_pkt_abort(lp, fsp); | |
1979 | fc_fcp_unlock_pkt(fsp); | |
1980 | ||
1981 | release_pkt: | |
1982 | fc_fcp_pkt_release(fsp); | |
1983 | return rc; | |
1984 | } | |
1985 | EXPORT_SYMBOL(fc_eh_abort); | |
1986 | ||
1987 | /** | |
34f42a07 | 1988 | * fc_eh_device_reset() Reset a single LUN |
42e9a92f RL |
1989 | * @sc_cmd: scsi command |
1990 | * | |
1991 | * Set from scsi host template to send tm cmd to the target and wait for the | |
1992 | * response. | |
1993 | */ | |
1994 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
1995 | { | |
1996 | struct fc_lport *lp; | |
1997 | struct fc_fcp_pkt *fsp; | |
1998 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
1999 | int rc = FAILED; | |
2000 | struct fc_rport_libfc_priv *rp; | |
2001 | int rval; | |
2002 | ||
2003 | rval = fc_remote_port_chkready(rport); | |
2004 | if (rval) | |
2005 | goto out; | |
2006 | ||
2007 | rp = rport->dd_data; | |
2008 | lp = shost_priv(sc_cmd->device->host); | |
2009 | ||
2010 | if (lp->state != LPORT_ST_READY) | |
2011 | return rc; | |
2012 | ||
2013 | fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO); | |
2014 | if (fsp == NULL) { | |
2015 | FC_DBG("could not allocate scsi_pkt\n"); | |
2016 | sc_cmd->result = DID_NO_CONNECT << 16; | |
2017 | goto out; | |
2018 | } | |
2019 | ||
2020 | /* | |
2021 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2022 | * the sc passed in is not setup for execution like when sent | |
2023 | * through the queuecommand callout. | |
2024 | */ | |
2025 | fsp->lp = lp; /* save the softc ptr */ | |
2026 | fsp->rport = rport; /* set the remote port ptr */ | |
2027 | ||
2028 | /* | |
2029 | * flush outstanding commands | |
2030 | */ | |
2031 | rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); | |
2032 | fsp->state = FC_SRB_FREE; | |
2033 | fc_fcp_pkt_release(fsp); | |
2034 | ||
2035 | out: | |
2036 | return rc; | |
2037 | } | |
2038 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2039 | ||
2040 | /** | |
34f42a07 | 2041 | * fc_eh_host_reset() - The reset function will reset the ports on the host. |
42e9a92f RL |
2042 | * @sc_cmd: scsi command |
2043 | */ | |
2044 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2045 | { | |
2046 | struct Scsi_Host *shost = sc_cmd->device->host; | |
2047 | struct fc_lport *lp = shost_priv(shost); | |
2048 | unsigned long wait_tmo; | |
2049 | ||
2050 | lp->tt.lport_reset(lp); | |
2051 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; | |
2052 | while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo)) | |
2053 | msleep(1000); | |
2054 | ||
2055 | if (fc_fcp_lport_queue_ready(lp)) { | |
2056 | shost_printk(KERN_INFO, shost, "Host reset succeeded.\n"); | |
2057 | return SUCCESS; | |
2058 | } else { | |
2059 | shost_printk(KERN_INFO, shost, "Host reset failed. " | |
2060 | "lport not ready.\n"); | |
2061 | return FAILED; | |
2062 | } | |
2063 | } | |
2064 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2065 | ||
2066 | /** | |
34f42a07 | 2067 | * fc_slave_alloc() - configure queue depth |
42e9a92f RL |
2068 | * @sdev: scsi device |
2069 | * | |
2070 | * Configures queue depth based on host's cmd_per_len. If not set | |
2071 | * then we use the libfc default. | |
2072 | */ | |
2073 | int fc_slave_alloc(struct scsi_device *sdev) | |
2074 | { | |
2075 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
2076 | int queue_depth; | |
2077 | ||
2078 | if (!rport || fc_remote_port_chkready(rport)) | |
2079 | return -ENXIO; | |
2080 | ||
2081 | if (sdev->tagged_supported) { | |
2082 | if (sdev->host->hostt->cmd_per_lun) | |
2083 | queue_depth = sdev->host->hostt->cmd_per_lun; | |
2084 | else | |
2085 | queue_depth = FC_FCP_DFLT_QUEUE_DEPTH; | |
2086 | scsi_activate_tcq(sdev, queue_depth); | |
2087 | } | |
2088 | return 0; | |
2089 | } | |
2090 | EXPORT_SYMBOL(fc_slave_alloc); | |
2091 | ||
2092 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
2093 | { | |
2094 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2095 | return sdev->queue_depth; | |
2096 | } | |
2097 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2098 | ||
2099 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) | |
2100 | { | |
2101 | if (sdev->tagged_supported) { | |
2102 | scsi_set_tag_type(sdev, tag_type); | |
2103 | if (tag_type) | |
2104 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2105 | else | |
2106 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2107 | } else | |
2108 | tag_type = 0; | |
2109 | ||
2110 | return tag_type; | |
2111 | } | |
2112 | EXPORT_SYMBOL(fc_change_queue_type); | |
2113 | ||
2114 | void fc_fcp_destroy(struct fc_lport *lp) | |
2115 | { | |
2116 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
2117 | ||
2118 | if (!list_empty(&si->scsi_pkt_queue)) | |
2119 | printk(KERN_ERR "Leaked scsi packets.\n"); | |
2120 | ||
2121 | mempool_destroy(si->scsi_pkt_pool); | |
2122 | kfree(si); | |
2123 | lp->scsi_priv = NULL; | |
2124 | } | |
2125 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2126 | ||
2127 | int fc_fcp_init(struct fc_lport *lp) | |
2128 | { | |
2129 | int rc; | |
2130 | struct fc_fcp_internal *si; | |
2131 | ||
2132 | if (!lp->tt.fcp_cmd_send) | |
2133 | lp->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
2134 | ||
2135 | if (!lp->tt.fcp_cleanup) | |
2136 | lp->tt.fcp_cleanup = fc_fcp_cleanup; | |
2137 | ||
2138 | if (!lp->tt.fcp_abort_io) | |
2139 | lp->tt.fcp_abort_io = fc_fcp_abort_io; | |
2140 | ||
2141 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2142 | if (!si) | |
2143 | return -ENOMEM; | |
2144 | lp->scsi_priv = si; | |
2145 | INIT_LIST_HEAD(&si->scsi_pkt_queue); | |
2146 | ||
2147 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2148 | if (!si->scsi_pkt_pool) { | |
2149 | rc = -ENOMEM; | |
2150 | goto free_internal; | |
2151 | } | |
2152 | return 0; | |
2153 | ||
2154 | free_internal: | |
2155 | kfree(si); | |
2156 | return rc; | |
2157 | } | |
2158 | EXPORT_SYMBOL(fc_fcp_init); | |
2159 | ||
2160 | static int __init libfc_init(void) | |
2161 | { | |
2162 | int rc; | |
2163 | ||
2164 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2165 | sizeof(struct fc_fcp_pkt), | |
2166 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2167 | if (scsi_pkt_cachep == NULL) { | |
2168 | FC_DBG("Unable to allocate SRB cache...module load failed!"); | |
2169 | return -ENOMEM; | |
2170 | } | |
2171 | ||
2172 | rc = fc_setup_exch_mgr(); | |
2173 | if (rc) | |
2174 | goto destroy_pkt_cache; | |
2175 | ||
2176 | rc = fc_setup_rport(); | |
2177 | if (rc) | |
2178 | goto destroy_em; | |
2179 | ||
2180 | return rc; | |
2181 | destroy_em: | |
2182 | fc_destroy_exch_mgr(); | |
2183 | destroy_pkt_cache: | |
2184 | kmem_cache_destroy(scsi_pkt_cachep); | |
2185 | return rc; | |
2186 | } | |
2187 | ||
2188 | static void __exit libfc_exit(void) | |
2189 | { | |
2190 | kmem_cache_destroy(scsi_pkt_cachep); | |
2191 | fc_destroy_exch_mgr(); | |
2192 | fc_destroy_rport(); | |
2193 | } | |
2194 | ||
2195 | module_init(libfc_init); | |
2196 | module_exit(libfc_exit); |