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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 | ||
8866a5d9 | 42 | #include "fc_libfc.h" |
42e9a92f | 43 | |
93e6d5ab | 44 | struct kmem_cache *scsi_pkt_cachep; |
42e9a92f RL |
45 | |
46 | /* SRB state definitions */ | |
47 | #define FC_SRB_FREE 0 /* cmd is free */ | |
48 | #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ | |
49 | #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ | |
50 | #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ | |
51 | #define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */ | |
52 | #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ | |
53 | #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ | |
54 | #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ | |
55 | #define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */ | |
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 host lock. NULL indicates | |
62 | * that the command has been retruned to the scsi layer. | |
63 | */ | |
64 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) | |
65 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) | |
66 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) | |
67 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) | |
68 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) | |
69 | ||
70 | struct fc_fcp_internal { | |
71 | mempool_t *scsi_pkt_pool; | |
72 | struct list_head scsi_pkt_queue; | |
73 | u8 throttled; | |
74 | }; | |
75 | ||
76 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
77 | ||
78 | /* | |
79 | * function prototypes | |
80 | * FC scsi I/O related functions | |
81 | */ | |
82 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
83 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
84 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
85 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
86 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
87 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp); | |
88 | static void fc_timeout_error(struct fc_fcp_pkt *); | |
89 | static void fc_fcp_timeout(unsigned long data); | |
90 | static void fc_fcp_rec(struct fc_fcp_pkt *); | |
91 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
92 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
93 | static void fc_io_compl(struct fc_fcp_pkt *); | |
94 | ||
95 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
96 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
97 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
98 | ||
99 | /* | |
100 | * command status codes | |
101 | */ | |
102 | #define FC_COMPLETE 0 | |
103 | #define FC_CMD_ABORTED 1 | |
104 | #define FC_CMD_RESET 2 | |
105 | #define FC_CMD_PLOGO 3 | |
106 | #define FC_SNS_RCV 4 | |
107 | #define FC_TRANS_ERR 5 | |
108 | #define FC_DATA_OVRRUN 6 | |
109 | #define FC_DATA_UNDRUN 7 | |
110 | #define FC_ERROR 8 | |
111 | #define FC_HRD_ERROR 9 | |
112 | #define FC_CMD_TIME_OUT 10 | |
113 | ||
114 | /* | |
115 | * Error recovery timeout values. | |
116 | */ | |
117 | #define FC_SCSI_ER_TIMEOUT (10 * HZ) | |
118 | #define FC_SCSI_TM_TOV (10 * HZ) | |
119 | #define FC_SCSI_REC_TOV (2 * HZ) | |
120 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) | |
121 | ||
122 | #define FC_MAX_ERROR_CNT 5 | |
123 | #define FC_MAX_RECOV_RETRY 3 | |
124 | ||
125 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
126 | ||
127 | /** | |
128 | * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet | |
129 | * @lp: fc lport struct | |
130 | * @gfp: gfp flags for allocation | |
131 | * | |
132 | * This is used by upper layer scsi driver. | |
133 | * Return Value : scsi_pkt structure or null on allocation failure. | |
134 | * Context : call from process context. no locking required. | |
135 | */ | |
136 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp) | |
137 | { | |
138 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
139 | struct fc_fcp_pkt *fsp; | |
140 | ||
141 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
142 | if (fsp) { | |
143 | memset(fsp, 0, sizeof(*fsp)); | |
144 | fsp->lp = lp; | |
145 | atomic_set(&fsp->ref_cnt, 1); | |
146 | init_timer(&fsp->timer); | |
147 | INIT_LIST_HEAD(&fsp->list); | |
148 | spin_lock_init(&fsp->scsi_pkt_lock); | |
149 | } | |
150 | return fsp; | |
151 | } | |
152 | ||
153 | /** | |
34f42a07 | 154 | * fc_fcp_pkt_release() - release hold on scsi_pkt packet |
42e9a92f RL |
155 | * @fsp: fcp packet struct |
156 | * | |
157 | * This is used by upper layer scsi driver. | |
158 | * Context : call from process and interrupt context. | |
159 | * no locking required | |
160 | */ | |
161 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
162 | { | |
163 | if (atomic_dec_and_test(&fsp->ref_cnt)) { | |
164 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); | |
165 | ||
166 | mempool_free(fsp, si->scsi_pkt_pool); | |
167 | } | |
168 | } | |
169 | ||
170 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) | |
171 | { | |
172 | atomic_inc(&fsp->ref_cnt); | |
173 | } | |
174 | ||
175 | /** | |
34f42a07 | 176 | * fc_fcp_pkt_destory() - release hold on scsi_pkt packet |
42e9a92f RL |
177 | * @seq: exchange sequence |
178 | * @fsp: fcp packet struct | |
179 | * | |
180 | * Release hold on scsi_pkt packet set to keep scsi_pkt | |
181 | * till EM layer exch resource is not freed. | |
182 | * Context : called from from EM layer. | |
183 | * no locking required | |
184 | */ | |
185 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
186 | { | |
187 | fc_fcp_pkt_release(fsp); | |
188 | } | |
189 | ||
190 | /** | |
34f42a07 | 191 | * fc_fcp_lock_pkt() - lock a packet and get a ref to it. |
42e9a92f RL |
192 | * @fsp: fcp packet |
193 | * | |
194 | * We should only return error if we return a command to scsi-ml before | |
195 | * getting a response. This can happen in cases where we send a abort, but | |
196 | * do not wait for the response and the abort and command can be passing | |
197 | * each other on the wire/network-layer. | |
198 | * | |
199 | * Note: this function locks the packet and gets a reference to allow | |
200 | * callers to call the completion function while the lock is held and | |
201 | * not have to worry about the packets refcount. | |
202 | * | |
203 | * TODO: Maybe we should just have callers grab/release the lock and | |
204 | * have a function that they call to verify the fsp and grab a ref if | |
205 | * needed. | |
206 | */ | |
207 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
208 | { | |
209 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
210 | if (fsp->state & FC_SRB_COMPL) { | |
211 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
212 | return -EPERM; | |
213 | } | |
214 | ||
215 | fc_fcp_pkt_hold(fsp); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) | |
220 | { | |
221 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
222 | fc_fcp_pkt_release(fsp); | |
223 | } | |
224 | ||
225 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) | |
226 | { | |
227 | if (!(fsp->state & FC_SRB_COMPL)) | |
228 | mod_timer(&fsp->timer, jiffies + delay); | |
229 | } | |
230 | ||
231 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) | |
232 | { | |
233 | if (!fsp->seq_ptr) | |
234 | return -EINVAL; | |
235 | ||
236 | fsp->state |= FC_SRB_ABORT_PENDING; | |
237 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); | |
238 | } | |
239 | ||
240 | /* | |
241 | * Retry command. | |
242 | * An abort isn't needed. | |
243 | */ | |
244 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) | |
245 | { | |
246 | if (fsp->seq_ptr) { | |
247 | fsp->lp->tt.exch_done(fsp->seq_ptr); | |
248 | fsp->seq_ptr = NULL; | |
249 | } | |
250 | ||
251 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 252 | fsp->io_status = 0; |
42e9a92f RL |
253 | fsp->status_code = FC_ERROR; |
254 | fc_fcp_complete_locked(fsp); | |
255 | } | |
256 | ||
b277d2aa YZ |
257 | /* |
258 | * fc_fcp_ddp_setup - calls to LLD's ddp_setup to set up DDP | |
259 | * transfer for a read I/O indicated by the fc_fcp_pkt. | |
260 | * @fsp: ptr to the fc_fcp_pkt | |
261 | * | |
262 | * This is called in exch_seq_send() when we have a newly allocated | |
263 | * exchange with a valid exchange id to setup ddp. | |
264 | * | |
265 | * returns: none | |
266 | */ | |
267 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
268 | { | |
269 | struct fc_lport *lp; | |
270 | ||
271 | if (!fsp) | |
272 | return; | |
273 | ||
274 | lp = fsp->lp; | |
275 | if ((fsp->req_flags & FC_SRB_READ) && | |
276 | (lp->lro_enabled) && (lp->tt.ddp_setup)) { | |
277 | if (lp->tt.ddp_setup(lp, xid, scsi_sglist(fsp->cmd), | |
278 | scsi_sg_count(fsp->cmd))) | |
279 | fsp->xfer_ddp = xid; | |
280 | } | |
281 | } | |
b277d2aa YZ |
282 | |
283 | /* | |
284 | * fc_fcp_ddp_done - calls to LLD's ddp_done to release any | |
285 | * DDP related resources for this I/O if it is initialized | |
286 | * as a ddp transfer | |
287 | * @fsp: ptr to the fc_fcp_pkt | |
288 | * | |
289 | * returns: none | |
290 | */ | |
291 | static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) | |
292 | { | |
293 | struct fc_lport *lp; | |
294 | ||
295 | if (!fsp) | |
296 | return; | |
297 | ||
5e472d07 YZ |
298 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
299 | return; | |
300 | ||
b277d2aa | 301 | lp = fsp->lp; |
5e472d07 | 302 | if (lp->tt.ddp_done) { |
b277d2aa | 303 | fsp->xfer_len = lp->tt.ddp_done(lp, fsp->xfer_ddp); |
5e472d07 | 304 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
305 | } |
306 | } | |
307 | ||
308 | ||
42e9a92f RL |
309 | /* |
310 | * Receive SCSI data from target. | |
311 | * Called after receiving solicited data. | |
312 | */ | |
313 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
314 | { | |
315 | struct scsi_cmnd *sc = fsp->cmd; | |
316 | struct fc_lport *lp = fsp->lp; | |
317 | struct fcoe_dev_stats *stats; | |
318 | struct fc_frame_header *fh; | |
319 | size_t start_offset; | |
320 | size_t offset; | |
321 | u32 crc; | |
322 | u32 copy_len = 0; | |
323 | size_t len; | |
324 | void *buf; | |
325 | struct scatterlist *sg; | |
326 | size_t remaining; | |
327 | ||
328 | fh = fc_frame_header_get(fp); | |
329 | offset = ntohl(fh->fh_parm_offset); | |
330 | start_offset = offset; | |
331 | len = fr_len(fp) - sizeof(*fh); | |
332 | buf = fc_frame_payload_get(fp, 0); | |
333 | ||
b277d2aa YZ |
334 | /* if this I/O is ddped, update xfer len */ |
335 | fc_fcp_ddp_done(fsp); | |
336 | ||
42e9a92f | 337 | if (offset + len > fsp->data_len) { |
34f42a07 | 338 | /* this should never happen */ |
42e9a92f RL |
339 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
340 | fc_frame_crc_check(fp)) | |
341 | goto crc_err; | |
7414705e RL |
342 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
343 | "data_len %x\n", len, offset, fsp->data_len); | |
42e9a92f RL |
344 | fc_fcp_retry_cmd(fsp); |
345 | return; | |
346 | } | |
347 | if (offset != fsp->xfer_len) | |
348 | fsp->state |= FC_SRB_DISCONTIG; | |
349 | ||
350 | crc = 0; | |
351 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) | |
352 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
353 | ||
354 | sg = scsi_sglist(sc); | |
355 | remaining = len; | |
356 | ||
357 | while (remaining > 0 && sg) { | |
358 | size_t off; | |
359 | void *page_addr; | |
360 | size_t sg_bytes; | |
361 | ||
362 | if (offset >= sg->length) { | |
363 | offset -= sg->length; | |
364 | sg = sg_next(sg); | |
365 | continue; | |
366 | } | |
367 | sg_bytes = min(remaining, sg->length - offset); | |
368 | ||
369 | /* | |
370 | * The scatterlist item may be bigger than PAGE_SIZE, | |
371 | * but we are limited to mapping PAGE_SIZE at a time. | |
372 | */ | |
373 | off = offset + sg->offset; | |
374 | sg_bytes = min(sg_bytes, (size_t) | |
375 | (PAGE_SIZE - (off & ~PAGE_MASK))); | |
376 | page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT), | |
377 | KM_SOFTIRQ0); | |
378 | if (!page_addr) | |
379 | break; /* XXX panic? */ | |
380 | ||
381 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) | |
382 | crc = crc32(crc, buf, sg_bytes); | |
383 | memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, | |
384 | sg_bytes); | |
385 | ||
386 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
387 | buf += sg_bytes; | |
388 | offset += sg_bytes; | |
389 | remaining -= sg_bytes; | |
390 | copy_len += sg_bytes; | |
391 | } | |
392 | ||
393 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
394 | buf = fc_frame_payload_get(fp, 0); | |
395 | if (len % 4) { | |
396 | crc = crc32(crc, buf + len, 4 - (len % 4)); | |
397 | len += 4 - (len % 4); | |
398 | } | |
399 | ||
400 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
401 | crc_err: | |
582b45bc | 402 | stats = fc_lport_get_stats(lp); |
42e9a92f | 403 | stats->ErrorFrames++; |
582b45bc | 404 | /* FIXME - per cpu count, not total count! */ |
42e9a92f | 405 | if (stats->InvalidCRCCount++ < 5) |
7414705e RL |
406 | printk(KERN_WARNING "libfc: CRC error on data " |
407 | "frame for port (%6x)\n", | |
582b45bc | 408 | fc_host_port_id(lp->host)); |
42e9a92f RL |
409 | /* |
410 | * Assume the frame is total garbage. | |
411 | * We may have copied it over the good part | |
412 | * of the buffer. | |
413 | * If so, we need to retry the entire operation. | |
414 | * Otherwise, ignore it. | |
415 | */ | |
416 | if (fsp->state & FC_SRB_DISCONTIG) | |
417 | fc_fcp_retry_cmd(fsp); | |
418 | return; | |
419 | } | |
420 | } | |
421 | ||
422 | if (fsp->xfer_contig_end == start_offset) | |
423 | fsp->xfer_contig_end += copy_len; | |
424 | fsp->xfer_len += copy_len; | |
425 | ||
426 | /* | |
427 | * In the very rare event that this data arrived after the response | |
428 | * and completes the transfer, call the completion handler. | |
429 | */ | |
430 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
431 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
432 | fc_fcp_complete_locked(fsp); | |
433 | } | |
434 | ||
34f42a07 RL |
435 | /** |
436 | * fc_fcp_send_data() - Send SCSI data to target. | |
42e9a92f RL |
437 | * @fsp: ptr to fc_fcp_pkt |
438 | * @sp: ptr to this sequence | |
439 | * @offset: starting offset for this data request | |
440 | * @seq_blen: the burst length for this data request | |
441 | * | |
442 | * Called after receiving a Transfer Ready data descriptor. | |
443 | * if LLD is capable of seq offload then send down seq_blen | |
444 | * size of data in single frame, otherwise send multiple FC | |
445 | * frames of max FC frame payload supported by target port. | |
446 | * | |
447 | * Returns : 0 for success. | |
448 | */ | |
449 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
450 | size_t offset, size_t seq_blen) | |
451 | { | |
452 | struct fc_exch *ep; | |
453 | struct scsi_cmnd *sc; | |
454 | struct scatterlist *sg; | |
455 | struct fc_frame *fp = NULL; | |
456 | struct fc_lport *lp = fsp->lp; | |
457 | size_t remaining; | |
458 | size_t t_blen; | |
459 | size_t tlen; | |
460 | size_t sg_bytes; | |
461 | size_t frame_offset, fh_parm_offset; | |
462 | int error; | |
463 | void *data = NULL; | |
464 | void *page_addr; | |
465 | int using_sg = lp->sg_supp; | |
466 | u32 f_ctl; | |
467 | ||
468 | WARN_ON(seq_blen <= 0); | |
469 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
470 | /* this should never happen */ | |
7414705e RL |
471 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
472 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
473 | fc_fcp_send_abort(fsp); |
474 | return 0; | |
475 | } else if (offset != fsp->xfer_len) { | |
476 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
477 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
478 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
479 | } |
480 | ||
481 | /* | |
482 | * if LLD is capable of seq_offload then set transport | |
483 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
484 | * to max FC frame payload previously set in fsp->max_payload. | |
485 | */ | |
276d6814 YZ |
486 | t_blen = fsp->max_payload; |
487 | if (lp->seq_offload) { | |
488 | t_blen = min(seq_blen, (size_t)lp->lso_max); | |
7414705e | 489 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
276d6814 YZ |
490 | fsp, seq_blen, lp->lso_max, t_blen); |
491 | } | |
492 | ||
42e9a92f RL |
493 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); |
494 | if (t_blen > 512) | |
495 | t_blen &= ~(512 - 1); /* round down to block size */ | |
496 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ | |
497 | sc = fsp->cmd; | |
498 | ||
499 | remaining = seq_blen; | |
500 | fh_parm_offset = frame_offset = offset; | |
501 | tlen = 0; | |
502 | seq = lp->tt.seq_start_next(seq); | |
503 | f_ctl = FC_FC_REL_OFF; | |
504 | WARN_ON(!seq); | |
505 | ||
42e9a92f RL |
506 | sg = scsi_sglist(sc); |
507 | ||
508 | while (remaining > 0 && sg) { | |
509 | if (offset >= sg->length) { | |
510 | offset -= sg->length; | |
511 | sg = sg_next(sg); | |
512 | continue; | |
513 | } | |
514 | if (!fp) { | |
515 | tlen = min(t_blen, remaining); | |
516 | ||
517 | /* | |
518 | * TODO. Temporary workaround. fc_seq_send() can't | |
519 | * handle odd lengths in non-linear skbs. | |
520 | * This will be the final fragment only. | |
521 | */ | |
522 | if (tlen % 4) | |
523 | using_sg = 0; | |
524 | if (using_sg) { | |
525 | fp = _fc_frame_alloc(lp, 0); | |
526 | if (!fp) | |
527 | return -ENOMEM; | |
528 | } else { | |
529 | fp = fc_frame_alloc(lp, tlen); | |
530 | if (!fp) | |
531 | return -ENOMEM; | |
532 | ||
533 | data = (void *)(fr_hdr(fp)) + | |
534 | sizeof(struct fc_frame_header); | |
535 | } | |
536 | fh_parm_offset = frame_offset; | |
537 | fr_max_payload(fp) = fsp->max_payload; | |
538 | } | |
539 | sg_bytes = min(tlen, sg->length - offset); | |
540 | if (using_sg) { | |
42e9a92f RL |
541 | get_page(sg_page(sg)); |
542 | skb_fill_page_desc(fp_skb(fp), | |
543 | skb_shinfo(fp_skb(fp))->nr_frags, | |
544 | sg_page(sg), sg->offset + offset, | |
545 | sg_bytes); | |
546 | fp_skb(fp)->data_len += sg_bytes; | |
547 | fr_len(fp) += sg_bytes; | |
548 | fp_skb(fp)->truesize += PAGE_SIZE; | |
549 | } else { | |
550 | size_t off = offset + sg->offset; | |
551 | ||
552 | /* | |
553 | * The scatterlist item may be bigger than PAGE_SIZE, | |
554 | * but we must not cross pages inside the kmap. | |
555 | */ | |
556 | sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE - | |
557 | (off & ~PAGE_MASK))); | |
558 | page_addr = kmap_atomic(sg_page(sg) + | |
559 | (off >> PAGE_SHIFT), | |
560 | KM_SOFTIRQ0); | |
561 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), | |
562 | sg_bytes); | |
563 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
564 | data += sg_bytes; | |
565 | } | |
566 | offset += sg_bytes; | |
567 | frame_offset += sg_bytes; | |
568 | tlen -= sg_bytes; | |
569 | remaining -= sg_bytes; | |
570 | ||
d37322a4 YZ |
571 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
572 | (tlen)) | |
42e9a92f RL |
573 | continue; |
574 | ||
575 | /* | |
576 | * Send sequence with transfer sequence initiative in case | |
577 | * this is last FCP frame of the sequence. | |
578 | */ | |
579 | if (remaining == 0) | |
580 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
581 | ||
582 | ep = fc_seq_exch(seq); | |
583 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
584 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
585 | ||
586 | /* | |
587 | * send fragment using for a sequence. | |
588 | */ | |
589 | error = lp->tt.seq_send(lp, seq, fp); | |
590 | if (error) { | |
591 | WARN_ON(1); /* send error should be rare */ | |
592 | fc_fcp_retry_cmd(fsp); | |
593 | return 0; | |
594 | } | |
595 | fp = NULL; | |
596 | } | |
597 | fsp->xfer_len += seq_blen; /* premature count? */ | |
598 | return 0; | |
599 | } | |
600 | ||
601 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
602 | { | |
603 | int ba_done = 1; | |
604 | struct fc_ba_rjt *brp; | |
605 | struct fc_frame_header *fh; | |
606 | ||
607 | fh = fc_frame_header_get(fp); | |
608 | switch (fh->fh_r_ctl) { | |
609 | case FC_RCTL_BA_ACC: | |
610 | break; | |
611 | case FC_RCTL_BA_RJT: | |
612 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
613 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
614 | break; | |
615 | /* fall thru */ | |
616 | default: | |
617 | /* | |
618 | * we will let the command timeout | |
619 | * and scsi-ml recover in this case, | |
620 | * therefore cleared the ba_done flag. | |
621 | */ | |
622 | ba_done = 0; | |
623 | } | |
624 | ||
625 | if (ba_done) { | |
626 | fsp->state |= FC_SRB_ABORTED; | |
627 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
628 | ||
629 | if (fsp->wait_for_comp) | |
630 | complete(&fsp->tm_done); | |
631 | else | |
632 | fc_fcp_complete_locked(fsp); | |
633 | } | |
634 | } | |
635 | ||
34f42a07 RL |
636 | /** |
637 | * fc_fcp_reduce_can_queue() - drop can_queue | |
42e9a92f RL |
638 | * @lp: lport to drop queueing for |
639 | * | |
640 | * If we are getting memory allocation failures, then we may | |
641 | * be trying to execute too many commands. We let the running | |
642 | * commands complete or timeout, then try again with a reduced | |
643 | * can_queue. Eventually we will hit the point where we run | |
644 | * on all reserved structs. | |
645 | */ | |
646 | static void fc_fcp_reduce_can_queue(struct fc_lport *lp) | |
647 | { | |
648 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
649 | unsigned long flags; | |
650 | int can_queue; | |
651 | ||
652 | spin_lock_irqsave(lp->host->host_lock, flags); | |
653 | if (si->throttled) | |
654 | goto done; | |
655 | si->throttled = 1; | |
656 | ||
657 | can_queue = lp->host->can_queue; | |
658 | can_queue >>= 1; | |
659 | if (!can_queue) | |
660 | can_queue = 1; | |
661 | lp->host->can_queue = can_queue; | |
7414705e | 662 | shost_printk(KERN_ERR, lp->host, "libfc: Could not allocate frame.\n" |
42e9a92f RL |
663 | "Reducing can_queue to %d.\n", can_queue); |
664 | done: | |
665 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
666 | } | |
667 | ||
34f42a07 RL |
668 | /** |
669 | * fc_fcp_recv() - Reveive FCP frames | |
670 | * @seq: The sequence the frame is on | |
671 | * @fp: The FC frame | |
672 | * @arg: The related FCP packet | |
42e9a92f RL |
673 | * |
674 | * Return : None | |
675 | * Context : called from Soft IRQ context | |
676 | * can not called holding list lock | |
677 | */ | |
678 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
679 | { | |
680 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 681 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
682 | struct fc_frame_header *fh; |
683 | struct fcp_txrdy *dd; | |
684 | u8 r_ctl; | |
685 | int rc = 0; | |
686 | ||
687 | if (IS_ERR(fp)) | |
688 | goto errout; | |
689 | ||
690 | fh = fc_frame_header_get(fp); | |
691 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 692 | |
a29e7646 | 693 | if (!(lport->state & LPORT_ST_READY)) |
42e9a92f RL |
694 | goto out; |
695 | if (fc_fcp_lock_pkt(fsp)) | |
696 | goto out; | |
697 | fsp->last_pkt_time = jiffies; | |
698 | ||
699 | if (fh->fh_type == FC_TYPE_BLS) { | |
700 | fc_fcp_abts_resp(fsp, fp); | |
701 | goto unlock; | |
702 | } | |
703 | ||
704 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
705 | goto unlock; | |
706 | ||
707 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
708 | /* | |
709 | * received XFER RDY from the target | |
710 | * need to send data to the target | |
711 | */ | |
712 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
713 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
714 | WARN_ON(!dd); | |
715 | ||
716 | rc = fc_fcp_send_data(fsp, seq, | |
717 | (size_t) ntohl(dd->ft_data_ro), | |
718 | (size_t) ntohl(dd->ft_burst_len)); | |
719 | if (!rc) | |
720 | seq->rec_data = fsp->xfer_len; | |
721 | else if (rc == -ENOMEM) | |
722 | fsp->state |= FC_SRB_NOMEM; | |
723 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { | |
724 | /* | |
725 | * received a DATA frame | |
726 | * next we will copy the data to the system buffer | |
727 | */ | |
728 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
729 | fc_fcp_recv_data(fsp, fp); | |
730 | seq->rec_data = fsp->xfer_contig_end; | |
731 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
732 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
733 | ||
734 | fc_fcp_resp(fsp, fp); | |
735 | } else { | |
7414705e | 736 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
737 | } |
738 | unlock: | |
739 | fc_fcp_unlock_pkt(fsp); | |
740 | out: | |
741 | fc_frame_free(fp); | |
742 | errout: | |
743 | if (IS_ERR(fp)) | |
744 | fc_fcp_error(fsp, fp); | |
745 | else if (rc == -ENOMEM) | |
a29e7646 | 746 | fc_fcp_reduce_can_queue(lport); |
42e9a92f RL |
747 | } |
748 | ||
749 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
750 | { | |
751 | struct fc_frame_header *fh; | |
752 | struct fcp_resp *fc_rp; | |
753 | struct fcp_resp_ext *rp_ex; | |
754 | struct fcp_resp_rsp_info *fc_rp_info; | |
755 | u32 plen; | |
756 | u32 expected_len; | |
757 | u32 respl = 0; | |
758 | u32 snsl = 0; | |
759 | u8 flags = 0; | |
760 | ||
761 | plen = fr_len(fp); | |
762 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
763 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
764 | goto len_err; | |
765 | plen -= sizeof(*fh); | |
766 | fc_rp = (struct fcp_resp *)(fh + 1); | |
767 | fsp->cdb_status = fc_rp->fr_status; | |
768 | flags = fc_rp->fr_flags; | |
769 | fsp->scsi_comp_flags = flags; | |
770 | expected_len = fsp->data_len; | |
771 | ||
b277d2aa YZ |
772 | /* if ddp, update xfer len */ |
773 | fc_fcp_ddp_done(fsp); | |
774 | ||
42e9a92f RL |
775 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
776 | rp_ex = (void *)(fc_rp + 1); | |
777 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
778 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
779 | goto len_err; | |
780 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
781 | if (flags & FCP_RSP_LEN_VAL) { | |
782 | respl = ntohl(rp_ex->fr_rsp_len); | |
783 | if (respl != sizeof(*fc_rp_info)) | |
784 | goto len_err; | |
785 | if (fsp->wait_for_comp) { | |
786 | /* Abuse cdb_status for rsp code */ | |
787 | fsp->cdb_status = fc_rp_info->rsp_code; | |
788 | complete(&fsp->tm_done); | |
789 | /* | |
790 | * tmfs will not have any scsi cmd so | |
791 | * exit here | |
792 | */ | |
793 | return; | |
794 | } else | |
795 | goto err; | |
796 | } | |
797 | if (flags & FCP_SNS_LEN_VAL) { | |
798 | snsl = ntohl(rp_ex->fr_sns_len); | |
799 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
800 | snsl = SCSI_SENSE_BUFFERSIZE; | |
801 | memcpy(fsp->cmd->sense_buffer, | |
802 | (char *)fc_rp_info + respl, snsl); | |
803 | } | |
804 | } | |
805 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
806 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
807 | goto len_err; | |
808 | if (flags & FCP_RESID_UNDER) { | |
809 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
810 | /* | |
811 | * The cmnd->underflow is the minimum number of | |
812 | * bytes that must be transfered for this | |
813 | * command. Provided a sense condition is not | |
814 | * present, make sure the actual amount | |
815 | * transferred is at least the underflow value | |
816 | * or fail. | |
817 | */ | |
818 | if (!(flags & FCP_SNS_LEN_VAL) && | |
819 | (fc_rp->fr_status == 0) && | |
820 | (scsi_bufflen(fsp->cmd) - | |
821 | fsp->scsi_resid) < fsp->cmd->underflow) | |
822 | goto err; | |
823 | expected_len -= fsp->scsi_resid; | |
824 | } else { | |
825 | fsp->status_code = FC_ERROR; | |
826 | } | |
827 | } | |
828 | } | |
829 | fsp->state |= FC_SRB_RCV_STATUS; | |
830 | ||
831 | /* | |
832 | * Check for missing or extra data frames. | |
833 | */ | |
834 | if (unlikely(fsp->xfer_len != expected_len)) { | |
835 | if (fsp->xfer_len < expected_len) { | |
836 | /* | |
837 | * Some data may be queued locally, | |
838 | * Wait a at least one jiffy to see if it is delivered. | |
839 | * If this expires without data, we may do SRR. | |
840 | */ | |
841 | fc_fcp_timer_set(fsp, 2); | |
842 | return; | |
843 | } | |
844 | fsp->status_code = FC_DATA_OVRRUN; | |
7414705e RL |
845 | FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, " |
846 | "len %x, data len %x\n", | |
847 | fsp->rport->port_id, | |
848 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
849 | } |
850 | fc_fcp_complete_locked(fsp); | |
851 | return; | |
852 | ||
853 | len_err: | |
7414705e RL |
854 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
855 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
856 | err: |
857 | fsp->status_code = FC_ERROR; | |
858 | fc_fcp_complete_locked(fsp); | |
859 | } | |
860 | ||
861 | /** | |
34f42a07 | 862 | * fc_fcp_complete_locked() - complete processing of a fcp packet |
42e9a92f RL |
863 | * @fsp: fcp packet |
864 | * | |
865 | * This function may sleep if a timer is pending. The packet lock must be | |
866 | * held, and the host lock must not be held. | |
867 | */ | |
868 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
869 | { | |
870 | struct fc_lport *lp = fsp->lp; | |
871 | struct fc_seq *seq; | |
872 | struct fc_exch *ep; | |
873 | u32 f_ctl; | |
874 | ||
875 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
876 | return; | |
877 | ||
878 | if (fsp->state & FC_SRB_ABORTED) { | |
879 | if (!fsp->status_code) | |
880 | fsp->status_code = FC_CMD_ABORTED; | |
881 | } else { | |
882 | /* | |
883 | * Test for transport underrun, independent of response | |
884 | * underrun status. | |
885 | */ | |
886 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
887 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
888 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
889 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 890 | fsp->io_status = 0; |
42e9a92f RL |
891 | } |
892 | } | |
893 | ||
894 | seq = fsp->seq_ptr; | |
895 | if (seq) { | |
896 | fsp->seq_ptr = NULL; | |
897 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
898 | struct fc_frame *conf_frame; | |
899 | struct fc_seq *csp; | |
900 | ||
901 | csp = lp->tt.seq_start_next(seq); | |
902 | conf_frame = fc_frame_alloc(fsp->lp, 0); | |
903 | if (conf_frame) { | |
904 | f_ctl = FC_FC_SEQ_INIT; | |
905 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
906 | ep = fc_seq_exch(seq); | |
907 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
908 | ep->did, ep->sid, | |
909 | FC_TYPE_FCP, f_ctl, 0); | |
910 | lp->tt.seq_send(lp, csp, conf_frame); | |
911 | } | |
912 | } | |
913 | lp->tt.exch_done(seq); | |
914 | } | |
915 | fc_io_compl(fsp); | |
916 | } | |
917 | ||
918 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) | |
919 | { | |
920 | struct fc_lport *lp = fsp->lp; | |
921 | ||
922 | if (fsp->seq_ptr) { | |
923 | lp->tt.exch_done(fsp->seq_ptr); | |
924 | fsp->seq_ptr = NULL; | |
925 | } | |
926 | fsp->status_code = error; | |
927 | } | |
928 | ||
929 | /** | |
34f42a07 | 930 | * fc_fcp_cleanup_each_cmd() - Cleanup active commads |
42e9a92f RL |
931 | * @lp: logical port |
932 | * @id: target id | |
933 | * @lun: lun | |
934 | * @error: fsp status code | |
935 | * | |
936 | * If lun or id is -1, they are ignored. | |
937 | */ | |
938 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id, | |
939 | unsigned int lun, int error) | |
940 | { | |
941 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
942 | struct fc_fcp_pkt *fsp; | |
943 | struct scsi_cmnd *sc_cmd; | |
944 | unsigned long flags; | |
945 | ||
946 | spin_lock_irqsave(lp->host->host_lock, flags); | |
947 | restart: | |
948 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
949 | sc_cmd = fsp->cmd; | |
950 | if (id != -1 && scmd_id(sc_cmd) != id) | |
951 | continue; | |
952 | ||
953 | if (lun != -1 && sc_cmd->device->lun != lun) | |
954 | continue; | |
955 | ||
956 | fc_fcp_pkt_hold(fsp); | |
957 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
958 | ||
959 | if (!fc_fcp_lock_pkt(fsp)) { | |
960 | fc_fcp_cleanup_cmd(fsp, error); | |
961 | fc_io_compl(fsp); | |
962 | fc_fcp_unlock_pkt(fsp); | |
963 | } | |
964 | ||
965 | fc_fcp_pkt_release(fsp); | |
966 | spin_lock_irqsave(lp->host->host_lock, flags); | |
967 | /* | |
968 | * while we dropped the lock multiple pkts could | |
969 | * have been released, so we have to start over. | |
970 | */ | |
971 | goto restart; | |
972 | } | |
973 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
974 | } | |
975 | ||
976 | static void fc_fcp_abort_io(struct fc_lport *lp) | |
977 | { | |
978 | fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR); | |
979 | } | |
980 | ||
981 | /** | |
34f42a07 | 982 | * fc_fcp_pkt_send() - send a fcp packet to the lower level. |
42e9a92f RL |
983 | * @lp: fc lport |
984 | * @fsp: fc packet. | |
985 | * | |
986 | * This is called by upper layer protocol. | |
987 | * Return : zero for success and -1 for failure | |
988 | * Context : called from queuecommand which can be called from process | |
989 | * or scsi soft irq. | |
990 | * Locks : called with the host lock and irqs disabled. | |
991 | */ | |
992 | static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp) | |
993 | { | |
994 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
995 | int rc; | |
996 | ||
997 | fsp->cmd->SCp.ptr = (char *)fsp; | |
998 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
999 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1000 | ||
1001 | int_to_scsilun(fsp->cmd->device->lun, | |
1002 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1003 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
1004 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1005 | ||
1006 | spin_unlock_irq(lp->host->host_lock); | |
1007 | rc = lp->tt.fcp_cmd_send(lp, fsp, fc_fcp_recv); | |
1008 | spin_lock_irq(lp->host->host_lock); | |
1009 | if (rc) | |
1010 | list_del(&fsp->list); | |
1011 | ||
1012 | return rc; | |
1013 | } | |
1014 | ||
1015 | static int fc_fcp_cmd_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp, | |
1016 | void (*resp)(struct fc_seq *, | |
1017 | struct fc_frame *fp, | |
1018 | void *arg)) | |
1019 | { | |
1020 | struct fc_frame *fp; | |
1021 | struct fc_seq *seq; | |
1022 | struct fc_rport *rport; | |
1023 | struct fc_rport_libfc_priv *rp; | |
1024 | const size_t len = sizeof(fsp->cdb_cmd); | |
1025 | int rc = 0; | |
1026 | ||
1027 | if (fc_fcp_lock_pkt(fsp)) | |
1028 | return 0; | |
1029 | ||
1030 | fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd)); | |
1031 | if (!fp) { | |
1032 | rc = -1; | |
1033 | goto unlock; | |
1034 | } | |
1035 | ||
1036 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1037 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1038 | rport = fsp->rport; |
1039 | fsp->max_payload = rport->maxframe_size; | |
1040 | rp = rport->dd_data; | |
1041 | ||
1042 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
1043 | fc_host_port_id(rp->local_port->host), FC_TYPE_FCP, | |
1044 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
1045 | ||
1046 | seq = lp->tt.exch_seq_send(lp, fp, resp, fc_fcp_pkt_destroy, fsp, 0); | |
1047 | if (!seq) { | |
42e9a92f RL |
1048 | rc = -1; |
1049 | goto unlock; | |
1050 | } | |
1051 | fsp->last_pkt_time = jiffies; | |
1052 | fsp->seq_ptr = seq; | |
1053 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1054 | ||
1055 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); | |
1056 | fc_fcp_timer_set(fsp, | |
1057 | (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? | |
1058 | FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); | |
1059 | unlock: | |
1060 | fc_fcp_unlock_pkt(fsp); | |
1061 | return rc; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * transport error handler | |
1066 | */ | |
1067 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1068 | { | |
1069 | int error = PTR_ERR(fp); | |
1070 | ||
1071 | if (fc_fcp_lock_pkt(fsp)) | |
1072 | return; | |
1073 | ||
7414705e | 1074 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1075 | fc_fcp_retry_cmd(fsp); |
1076 | goto unlock; | |
42e9a92f | 1077 | } |
7414705e | 1078 | |
42e9a92f RL |
1079 | /* |
1080 | * clear abort pending, because the lower layer | |
1081 | * decided to force completion. | |
1082 | */ | |
1083 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1084 | fsp->status_code = FC_CMD_PLOGO; | |
1085 | fc_fcp_complete_locked(fsp); | |
1086 | unlock: | |
1087 | fc_fcp_unlock_pkt(fsp); | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Scsi abort handler- calls to send an abort | |
1092 | * and then wait for abort completion | |
1093 | */ | |
c340111d | 1094 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1095 | { |
1096 | int rc = FAILED; | |
1097 | ||
1098 | if (fc_fcp_send_abort(fsp)) | |
1099 | return FAILED; | |
1100 | ||
1101 | init_completion(&fsp->tm_done); | |
1102 | fsp->wait_for_comp = 1; | |
1103 | ||
1104 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1105 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1106 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1107 | fsp->wait_for_comp = 0; | |
1108 | ||
1109 | if (!rc) { | |
7414705e | 1110 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f RL |
1111 | rc = FAILED; |
1112 | } else if (fsp->state & FC_SRB_ABORTED) { | |
7414705e | 1113 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1114 | rc = SUCCESS; |
1115 | fc_fcp_complete_locked(fsp); | |
1116 | } | |
1117 | ||
1118 | return rc; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Retry LUN reset after resource allocation failed. | |
1123 | */ | |
1124 | static void fc_lun_reset_send(unsigned long data) | |
1125 | { | |
1126 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1127 | struct fc_lport *lp = fsp->lp; | |
1128 | if (lp->tt.fcp_cmd_send(lp, fsp, fc_tm_done)) { | |
1129 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) | |
1130 | return; | |
1131 | if (fc_fcp_lock_pkt(fsp)) | |
1132 | return; | |
1133 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); | |
1134 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1135 | fc_fcp_unlock_pkt(fsp); | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * Scsi device reset handler- send a LUN RESET to the device | |
1141 | * and wait for reset reply | |
1142 | */ | |
1143 | static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp, | |
1144 | unsigned int id, unsigned int lun) | |
1145 | { | |
1146 | int rc; | |
1147 | ||
1148 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1149 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1150 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1151 | ||
1152 | fsp->wait_for_comp = 1; | |
1153 | init_completion(&fsp->tm_done); | |
1154 | ||
1155 | fc_lun_reset_send((unsigned long)fsp); | |
1156 | ||
1157 | /* | |
1158 | * wait for completion of reset | |
1159 | * after that make sure all commands are terminated | |
1160 | */ | |
1161 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1162 | ||
1163 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1164 | fsp->state |= FC_SRB_COMPL; | |
1165 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1166 | ||
1167 | del_timer_sync(&fsp->timer); | |
1168 | ||
1169 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1170 | if (fsp->seq_ptr) { | |
1171 | lp->tt.exch_done(fsp->seq_ptr); | |
1172 | fsp->seq_ptr = NULL; | |
1173 | } | |
1174 | fsp->wait_for_comp = 0; | |
1175 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1176 | ||
1177 | if (!rc) { | |
7414705e | 1178 | FC_SCSI_DBG(lp, "lun reset failed\n"); |
42e9a92f RL |
1179 | return FAILED; |
1180 | } | |
1181 | ||
1182 | /* cdb_status holds the tmf's rsp code */ | |
1183 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1184 | return FAILED; | |
1185 | ||
7414705e | 1186 | FC_SCSI_DBG(lp, "lun reset to lun %u completed\n", lun); |
42e9a92f RL |
1187 | fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED); |
1188 | return SUCCESS; | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Task Managment response handler | |
1193 | */ | |
1194 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1195 | { | |
1196 | struct fc_fcp_pkt *fsp = arg; | |
1197 | struct fc_frame_header *fh; | |
1198 | ||
1199 | if (IS_ERR(fp)) { | |
1200 | /* | |
1201 | * If there is an error just let it timeout or wait | |
1202 | * for TMF to be aborted if it timedout. | |
1203 | * | |
1204 | * scsi-eh will escalate for when either happens. | |
1205 | */ | |
1206 | return; | |
1207 | } | |
1208 | ||
1209 | if (fc_fcp_lock_pkt(fsp)) | |
1210 | return; | |
1211 | ||
1212 | /* | |
1213 | * raced with eh timeout handler. | |
1214 | */ | |
1215 | if (!fsp->seq_ptr || !fsp->wait_for_comp) { | |
1216 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1217 | return; | |
1218 | } | |
1219 | ||
1220 | fh = fc_frame_header_get(fp); | |
1221 | if (fh->fh_type != FC_TYPE_BLS) | |
1222 | fc_fcp_resp(fsp, fp); | |
1223 | fsp->seq_ptr = NULL; | |
1224 | fsp->lp->tt.exch_done(seq); | |
1225 | fc_frame_free(fp); | |
1226 | fc_fcp_unlock_pkt(fsp); | |
1227 | } | |
1228 | ||
1229 | static void fc_fcp_cleanup(struct fc_lport *lp) | |
1230 | { | |
1231 | fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR); | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * fc_fcp_timeout: called by OS timer function. | |
1236 | * | |
1237 | * The timer has been inactivated and must be reactivated if desired | |
1238 | * using fc_fcp_timer_set(). | |
1239 | * | |
1240 | * Algorithm: | |
1241 | * | |
1242 | * If REC is supported, just issue it, and return. The REC exchange will | |
1243 | * complete or time out, and recovery can continue at that point. | |
1244 | * | |
1245 | * Otherwise, if the response has been received without all the data, | |
1246 | * it has been ER_TIMEOUT since the response was received. | |
1247 | * | |
1248 | * If the response has not been received, | |
1249 | * we see if data was received recently. If it has been, we continue waiting, | |
1250 | * otherwise, we abort the command. | |
1251 | */ | |
1252 | static void fc_fcp_timeout(unsigned long data) | |
1253 | { | |
1254 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1255 | struct fc_rport *rport = fsp->rport; | |
1256 | struct fc_rport_libfc_priv *rp = rport->dd_data; | |
1257 | ||
1258 | if (fc_fcp_lock_pkt(fsp)) | |
1259 | return; | |
1260 | ||
1261 | if (fsp->cdb_cmd.fc_tm_flags) | |
1262 | goto unlock; | |
1263 | ||
1264 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1265 | ||
1266 | if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED) | |
1267 | fc_fcp_rec(fsp); | |
1268 | else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), | |
1269 | jiffies)) | |
1270 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); | |
1271 | else if (fsp->state & FC_SRB_RCV_STATUS) | |
1272 | fc_fcp_complete_locked(fsp); | |
1273 | else | |
1274 | fc_timeout_error(fsp); | |
1275 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; | |
1276 | unlock: | |
1277 | fc_fcp_unlock_pkt(fsp); | |
1278 | } | |
1279 | ||
1280 | /* | |
1281 | * Send a REC ELS request | |
1282 | */ | |
1283 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1284 | { | |
1285 | struct fc_lport *lp; | |
1286 | struct fc_frame *fp; | |
1287 | struct fc_rport *rport; | |
1288 | struct fc_rport_libfc_priv *rp; | |
1289 | ||
1290 | lp = fsp->lp; | |
1291 | rport = fsp->rport; | |
1292 | rp = rport->dd_data; | |
1293 | if (!fsp->seq_ptr || rp->rp_state != RPORT_ST_READY) { | |
1294 | fsp->status_code = FC_HRD_ERROR; | |
1c9fbafc | 1295 | fsp->io_status = 0; |
42e9a92f RL |
1296 | fc_fcp_complete_locked(fsp); |
1297 | return; | |
1298 | } | |
1299 | fp = fc_frame_alloc(lp, sizeof(struct fc_els_rec)); | |
1300 | if (!fp) | |
1301 | goto retry; | |
1302 | ||
1303 | fr_seq(fp) = fsp->seq_ptr; | |
1304 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
1305 | fc_host_port_id(rp->local_port->host), FC_TYPE_ELS, | |
1306 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
a46f327a | 1307 | if (lp->tt.elsct_send(lp, rport->port_id, fp, ELS_REC, fc_fcp_rec_resp, |
42e9a92f RL |
1308 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV))) { |
1309 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ | |
1310 | return; | |
1311 | } | |
42e9a92f RL |
1312 | retry: |
1313 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1314 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1315 | else | |
1316 | fc_timeout_error(fsp); | |
1317 | } | |
1318 | ||
1319 | /* | |
1320 | * Receive handler for REC ELS frame | |
1321 | * if it is a reject then let the scsi layer to handle | |
1322 | * the timeout. if it is a LS_ACC then if the io was not completed | |
1323 | * then set the timeout and return otherwise complete the exchange | |
1324 | * and tell the scsi layer to restart the I/O. | |
1325 | */ | |
1326 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1327 | { | |
1328 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1329 | struct fc_els_rec_acc *recp; | |
1330 | struct fc_els_ls_rjt *rjt; | |
1331 | u32 e_stat; | |
1332 | u8 opcode; | |
1333 | u32 offset; | |
1334 | enum dma_data_direction data_dir; | |
1335 | enum fc_rctl r_ctl; | |
1336 | struct fc_rport_libfc_priv *rp; | |
1337 | ||
1338 | if (IS_ERR(fp)) { | |
1339 | fc_fcp_rec_error(fsp, fp); | |
1340 | return; | |
1341 | } | |
1342 | ||
1343 | if (fc_fcp_lock_pkt(fsp)) | |
1344 | goto out; | |
1345 | ||
1346 | fsp->recov_retry = 0; | |
1347 | opcode = fc_frame_payload_op(fp); | |
1348 | if (opcode == ELS_LS_RJT) { | |
1349 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1350 | switch (rjt->er_reason) { | |
1351 | default: | |
7414705e RL |
1352 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1353 | "reason %d expl %d\n", | |
1354 | fsp->rport->port_id, rjt->er_reason, | |
1355 | rjt->er_explan); | |
42e9a92f RL |
1356 | /* fall through */ |
1357 | case ELS_RJT_UNSUP: | |
7414705e | 1358 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
42e9a92f RL |
1359 | rp = fsp->rport->dd_data; |
1360 | /* | |
1361 | * if we do not spport RECs or got some bogus | |
1362 | * reason then resetup timer so we check for | |
1363 | * making progress. | |
1364 | */ | |
1365 | rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; | |
1366 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); | |
1367 | break; | |
1368 | case ELS_RJT_LOGIC: | |
1369 | case ELS_RJT_UNAB: | |
1370 | /* | |
1371 | * If no data transfer, the command frame got dropped | |
1372 | * so we just retry. If data was transferred, we | |
1373 | * lost the response but the target has no record, | |
1374 | * so we abort and retry. | |
1375 | */ | |
1376 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1377 | fsp->xfer_len == 0) { | |
1378 | fc_fcp_retry_cmd(fsp); | |
1379 | break; | |
1380 | } | |
1381 | fc_timeout_error(fsp); | |
1382 | break; | |
1383 | } | |
1384 | } else if (opcode == ELS_LS_ACC) { | |
1385 | if (fsp->state & FC_SRB_ABORTED) | |
1386 | goto unlock_out; | |
1387 | ||
1388 | data_dir = fsp->cmd->sc_data_direction; | |
1389 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1390 | offset = ntohl(recp->reca_fc4value); | |
1391 | e_stat = ntohl(recp->reca_e_stat); | |
1392 | ||
1393 | if (e_stat & ESB_ST_COMPLETE) { | |
1394 | ||
1395 | /* | |
1396 | * The exchange is complete. | |
1397 | * | |
1398 | * For output, we must've lost the response. | |
1399 | * For input, all data must've been sent. | |
1400 | * We lost may have lost the response | |
1401 | * (and a confirmation was requested) and maybe | |
1402 | * some data. | |
1403 | * | |
1404 | * If all data received, send SRR | |
1405 | * asking for response. If partial data received, | |
1406 | * or gaps, SRR requests data at start of gap. | |
1407 | * Recovery via SRR relies on in-order-delivery. | |
1408 | */ | |
1409 | if (data_dir == DMA_TO_DEVICE) { | |
1410 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1411 | } else if (fsp->xfer_contig_end == offset) { | |
1412 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1413 | } else { | |
1414 | offset = fsp->xfer_contig_end; | |
1415 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1416 | } | |
1417 | fc_fcp_srr(fsp, r_ctl, offset); | |
1418 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
1419 | ||
1420 | /* | |
1421 | * The remote port has the initiative, so just | |
1422 | * keep waiting for it to complete. | |
1423 | */ | |
1424 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1425 | } else { | |
1426 | ||
1427 | /* | |
1428 | * The exchange is incomplete, we have seq. initiative. | |
1429 | * Lost response with requested confirmation, | |
1430 | * lost confirmation, lost transfer ready or | |
1431 | * lost write data. | |
1432 | * | |
1433 | * For output, if not all data was received, ask | |
1434 | * for transfer ready to be repeated. | |
1435 | * | |
1436 | * If we received or sent all the data, send SRR to | |
1437 | * request response. | |
1438 | * | |
1439 | * If we lost a response, we may have lost some read | |
1440 | * data as well. | |
1441 | */ | |
1442 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1443 | if (data_dir == DMA_TO_DEVICE) { | |
1444 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1445 | if (offset < fsp->data_len) | |
1446 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1447 | } else if (offset == fsp->xfer_contig_end) { | |
1448 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1449 | } else if (fsp->xfer_contig_end < offset) { | |
1450 | offset = fsp->xfer_contig_end; | |
1451 | } | |
1452 | fc_fcp_srr(fsp, r_ctl, offset); | |
1453 | } | |
1454 | } | |
1455 | unlock_out: | |
1456 | fc_fcp_unlock_pkt(fsp); | |
1457 | out: | |
1458 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1459 | fc_frame_free(fp); | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * Handle error response or timeout for REC exchange. | |
1464 | */ | |
1465 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1466 | { | |
1467 | int error = PTR_ERR(fp); | |
1468 | ||
1469 | if (fc_fcp_lock_pkt(fsp)) | |
1470 | goto out; | |
1471 | ||
1472 | switch (error) { | |
1473 | case -FC_EX_CLOSED: | |
1474 | fc_fcp_retry_cmd(fsp); | |
1475 | break; | |
1476 | ||
1477 | default: | |
7414705e RL |
1478 | FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n", |
1479 | fsp, fsp->rport->port_id, error); | |
42e9a92f RL |
1480 | fsp->status_code = FC_CMD_PLOGO; |
1481 | /* fall through */ | |
1482 | ||
1483 | case -FC_EX_TIMEOUT: | |
1484 | /* | |
1485 | * Assume REC or LS_ACC was lost. | |
1486 | * The exchange manager will have aborted REC, so retry. | |
1487 | */ | |
7414705e RL |
1488 | FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n", |
1489 | fsp->rport->port_id, error, fsp->recov_retry, | |
1490 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1491 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1492 | fc_fcp_rec(fsp); | |
1493 | else | |
1494 | fc_timeout_error(fsp); | |
1495 | break; | |
1496 | } | |
1497 | fc_fcp_unlock_pkt(fsp); | |
1498 | out: | |
1499 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * Time out error routine: | |
1504 | * abort's the I/O close the exchange and | |
1505 | * send completion notification to scsi layer | |
1506 | */ | |
1507 | static void fc_timeout_error(struct fc_fcp_pkt *fsp) | |
1508 | { | |
1509 | fsp->status_code = FC_CMD_TIME_OUT; | |
1510 | fsp->cdb_status = 0; | |
1511 | fsp->io_status = 0; | |
1512 | /* | |
1513 | * if this fails then we let the scsi command timer fire and | |
1514 | * scsi-ml escalate. | |
1515 | */ | |
1516 | fc_fcp_send_abort(fsp); | |
1517 | } | |
1518 | ||
1519 | /* | |
1520 | * Sequence retransmission request. | |
1521 | * This is called after receiving status but insufficient data, or | |
1522 | * when expecting status but the request has timed out. | |
1523 | */ | |
1524 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1525 | { | |
1526 | struct fc_lport *lp = fsp->lp; | |
1527 | struct fc_rport *rport; | |
1528 | struct fc_rport_libfc_priv *rp; | |
1529 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); | |
1530 | struct fc_seq *seq; | |
1531 | struct fcp_srr *srr; | |
1532 | struct fc_frame *fp; | |
1533 | u8 cdb_op; | |
1534 | ||
1535 | rport = fsp->rport; | |
1536 | rp = rport->dd_data; | |
1537 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; | |
1538 | ||
1539 | if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY) | |
1540 | goto retry; /* shouldn't happen */ | |
1541 | fp = fc_frame_alloc(lp, sizeof(*srr)); | |
1542 | if (!fp) | |
1543 | goto retry; | |
1544 | ||
1545 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1546 | memset(srr, 0, sizeof(*srr)); | |
1547 | srr->srr_op = ELS_SRR; | |
1548 | srr->srr_ox_id = htons(ep->oxid); | |
1549 | srr->srr_rx_id = htons(ep->rxid); | |
1550 | srr->srr_r_ctl = r_ctl; | |
1551 | srr->srr_rel_off = htonl(offset); | |
1552 | ||
1553 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
1554 | fc_host_port_id(rp->local_port->host), FC_TYPE_FCP, | |
1555 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); | |
1556 | ||
1557 | seq = lp->tt.exch_seq_send(lp, fp, fc_fcp_srr_resp, NULL, | |
1558 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); | |
8f550f93 | 1559 | if (!seq) |
42e9a92f | 1560 | goto retry; |
8f550f93 | 1561 | |
42e9a92f RL |
1562 | fsp->recov_seq = seq; |
1563 | fsp->xfer_len = offset; | |
1564 | fsp->xfer_contig_end = offset; | |
1565 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1566 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1567 | return; | |
1568 | retry: | |
1569 | fc_fcp_retry_cmd(fsp); | |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Handle response from SRR. | |
1574 | */ | |
1575 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1576 | { | |
1577 | struct fc_fcp_pkt *fsp = arg; | |
1578 | struct fc_frame_header *fh; | |
1579 | ||
1580 | if (IS_ERR(fp)) { | |
1581 | fc_fcp_srr_error(fsp, fp); | |
1582 | return; | |
1583 | } | |
1584 | ||
1585 | if (fc_fcp_lock_pkt(fsp)) | |
1586 | goto out; | |
1587 | ||
1588 | fh = fc_frame_header_get(fp); | |
1589 | /* | |
1590 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1591 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1592 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1593 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1594 | * an abort response though. | |
1595 | */ | |
1596 | if (fh->fh_type == FC_TYPE_BLS) { | |
1597 | fc_fcp_unlock_pkt(fsp); | |
1598 | return; | |
1599 | } | |
1600 | ||
1601 | fsp->recov_seq = NULL; | |
1602 | switch (fc_frame_payload_op(fp)) { | |
1603 | case ELS_LS_ACC: | |
1604 | fsp->recov_retry = 0; | |
1605 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1606 | break; | |
1607 | case ELS_LS_RJT: | |
1608 | default: | |
1609 | fc_timeout_error(fsp); | |
1610 | break; | |
1611 | } | |
1612 | fc_fcp_unlock_pkt(fsp); | |
1613 | fsp->lp->tt.exch_done(seq); | |
1614 | out: | |
1615 | fc_frame_free(fp); | |
1616 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1617 | } | |
1618 | ||
1619 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1620 | { | |
1621 | if (fc_fcp_lock_pkt(fsp)) | |
1622 | goto out; | |
1623 | fsp->lp->tt.exch_done(fsp->recov_seq); | |
1624 | fsp->recov_seq = NULL; | |
1625 | switch (PTR_ERR(fp)) { | |
1626 | case -FC_EX_TIMEOUT: | |
1627 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1628 | fc_fcp_rec(fsp); | |
1629 | else | |
1630 | fc_timeout_error(fsp); | |
1631 | break; | |
1632 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1633 | /* fall through */ | |
1634 | default: | |
1635 | fc_fcp_retry_cmd(fsp); | |
1636 | break; | |
1637 | } | |
1638 | fc_fcp_unlock_pkt(fsp); | |
1639 | out: | |
1640 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1641 | } | |
1642 | ||
1643 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp) | |
1644 | { | |
1645 | /* lock ? */ | |
bc0e17f6 | 1646 | return (lp->state == LPORT_ST_READY) && lp->link_up && !lp->qfull; |
42e9a92f RL |
1647 | } |
1648 | ||
1649 | /** | |
1650 | * fc_queuecommand - The queuecommand function of the scsi template | |
1651 | * @cmd: struct scsi_cmnd to be executed | |
1652 | * @done: Callback function to be called when cmd is completed | |
1653 | * | |
1654 | * this is the i/o strategy routine, called by the scsi layer | |
1655 | * this routine is called with holding the host_lock. | |
1656 | */ | |
1657 | int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) | |
1658 | { | |
1659 | struct fc_lport *lp; | |
1660 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
1661 | struct fc_fcp_pkt *fsp; | |
1662 | struct fc_rport_libfc_priv *rp; | |
1663 | int rval; | |
1664 | int rc = 0; | |
1665 | struct fcoe_dev_stats *stats; | |
1666 | ||
1667 | lp = shost_priv(sc_cmd->device->host); | |
1668 | ||
1669 | rval = fc_remote_port_chkready(rport); | |
1670 | if (rval) { | |
1671 | sc_cmd->result = rval; | |
1672 | done(sc_cmd); | |
1673 | goto out; | |
1674 | } | |
1675 | ||
1676 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1677 | /* | |
1678 | * rport is transitioning from blocked/deleted to | |
1679 | * online | |
1680 | */ | |
1681 | sc_cmd->result = DID_IMM_RETRY << 16; | |
1682 | done(sc_cmd); | |
1683 | goto out; | |
1684 | } | |
1685 | ||
1686 | rp = rport->dd_data; | |
1687 | ||
1688 | if (!fc_fcp_lport_queue_ready(lp)) { | |
1689 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1690 | goto out; | |
1691 | } | |
1692 | ||
1693 | fsp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC); | |
1694 | if (fsp == NULL) { | |
1695 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1696 | goto out; | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * build the libfc request pkt | |
1701 | */ | |
1702 | fsp->cmd = sc_cmd; /* save the cmd */ | |
1703 | fsp->lp = lp; /* save the softc ptr */ | |
1704 | fsp->rport = rport; /* set the remote port ptr */ | |
5e472d07 | 1705 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
1706 | sc_cmd->scsi_done = done; |
1707 | ||
1708 | /* | |
1709 | * set up the transfer length | |
1710 | */ | |
1711 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1712 | fsp->xfer_len = 0; | |
1713 | ||
1714 | /* | |
1715 | * setup the data direction | |
1716 | */ | |
582b45bc | 1717 | stats = fc_lport_get_stats(lp); |
42e9a92f RL |
1718 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1719 | fsp->req_flags = FC_SRB_READ; | |
1720 | stats->InputRequests++; | |
1721 | stats->InputMegabytes = fsp->data_len; | |
1722 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { | |
1723 | fsp->req_flags = FC_SRB_WRITE; | |
1724 | stats->OutputRequests++; | |
1725 | stats->OutputMegabytes = fsp->data_len; | |
1726 | } else { | |
1727 | fsp->req_flags = 0; | |
1728 | stats->ControlRequests++; | |
1729 | } | |
1730 | ||
1731 | fsp->tgt_flags = rp->flags; | |
1732 | ||
1733 | init_timer(&fsp->timer); | |
1734 | fsp->timer.data = (unsigned long)fsp; | |
1735 | ||
1736 | /* | |
1737 | * send it to the lower layer | |
1738 | * if we get -1 return then put the request in the pending | |
1739 | * queue. | |
1740 | */ | |
1741 | rval = fc_fcp_pkt_send(lp, fsp); | |
1742 | if (rval != 0) { | |
1743 | fsp->state = FC_SRB_FREE; | |
1744 | fc_fcp_pkt_release(fsp); | |
1745 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1746 | } | |
1747 | out: | |
1748 | return rc; | |
1749 | } | |
1750 | EXPORT_SYMBOL(fc_queuecommand); | |
1751 | ||
1752 | /** | |
34f42a07 | 1753 | * fc_io_compl() - Handle responses for completed commands |
42e9a92f RL |
1754 | * @fsp: scsi packet |
1755 | * | |
1756 | * Translates a error to a Linux SCSI error. | |
1757 | * | |
1758 | * The fcp packet lock must be held when calling. | |
1759 | */ | |
1760 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1761 | { | |
1762 | struct fc_fcp_internal *si; | |
1763 | struct scsi_cmnd *sc_cmd; | |
1764 | struct fc_lport *lp; | |
1765 | unsigned long flags; | |
1766 | ||
b277d2aa YZ |
1767 | /* release outstanding ddp context */ |
1768 | fc_fcp_ddp_done(fsp); | |
1769 | ||
42e9a92f RL |
1770 | fsp->state |= FC_SRB_COMPL; |
1771 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1772 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1773 | del_timer_sync(&fsp->timer); | |
1774 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1775 | } | |
1776 | ||
1777 | lp = fsp->lp; | |
1778 | si = fc_get_scsi_internal(lp); | |
1779 | spin_lock_irqsave(lp->host->host_lock, flags); | |
1780 | if (!fsp->cmd) { | |
1781 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1782 | return; | |
1783 | } | |
1784 | ||
1785 | /* | |
1786 | * if a command timed out while we had to try and throttle IO | |
1787 | * and it is now getting cleaned up, then we are about to | |
1788 | * try again so clear the throttled flag incase we get more | |
1789 | * time outs. | |
1790 | */ | |
1791 | if (si->throttled && fsp->state & FC_SRB_NOMEM) | |
1792 | si->throttled = 0; | |
1793 | ||
1794 | sc_cmd = fsp->cmd; | |
1795 | fsp->cmd = NULL; | |
1796 | ||
1797 | if (!sc_cmd->SCp.ptr) { | |
1798 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1799 | return; | |
1800 | } | |
1801 | ||
1802 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; | |
1803 | switch (fsp->status_code) { | |
1804 | case FC_COMPLETE: | |
1805 | if (fsp->cdb_status == 0) { | |
1806 | /* | |
1807 | * good I/O status | |
1808 | */ | |
1809 | sc_cmd->result = DID_OK << 16; | |
1810 | if (fsp->scsi_resid) | |
1811 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1812 | } else { |
1813 | /* | |
1814 | * transport level I/O was ok but scsi | |
1815 | * has non zero status | |
1816 | */ | |
1817 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1818 | } | |
1819 | break; | |
1820 | case FC_ERROR: | |
1821 | sc_cmd->result = DID_ERROR << 16; | |
1822 | break; | |
1823 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1824 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1825 | /* |
1826 | * scsi status is good but transport level | |
26d9cab5 | 1827 | * underrun. |
42e9a92f | 1828 | */ |
4347fa66 YZ |
1829 | sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ? |
1830 | DID_OK : DID_ERROR) << 16; | |
42e9a92f RL |
1831 | } else { |
1832 | /* | |
1833 | * scsi got underrun, this is an error | |
1834 | */ | |
1835 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
1836 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1837 | } | |
1838 | break; | |
1839 | case FC_DATA_OVRRUN: | |
1840 | /* | |
1841 | * overrun is an error | |
1842 | */ | |
1843 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1844 | break; | |
1845 | case FC_CMD_ABORTED: | |
d5e6054a | 1846 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f RL |
1847 | break; |
1848 | case FC_CMD_TIME_OUT: | |
1849 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
1850 | break; | |
1851 | case FC_CMD_RESET: | |
1852 | sc_cmd->result = (DID_RESET << 16); | |
1853 | break; | |
1854 | case FC_HRD_ERROR: | |
1855 | sc_cmd->result = (DID_NO_CONNECT << 16); | |
1856 | break; | |
1857 | default: | |
1858 | sc_cmd->result = (DID_ERROR << 16); | |
1859 | break; | |
1860 | } | |
1861 | ||
1862 | list_del(&fsp->list); | |
1863 | sc_cmd->SCp.ptr = NULL; | |
1864 | sc_cmd->scsi_done(sc_cmd); | |
1865 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1866 | ||
1867 | /* release ref from initial allocation in queue command */ | |
1868 | fc_fcp_pkt_release(fsp); | |
1869 | } | |
1870 | ||
42e9a92f | 1871 | /** |
34f42a07 | 1872 | * fc_eh_abort() - Abort a command |
42e9a92f RL |
1873 | * @sc_cmd: scsi command to abort |
1874 | * | |
34f42a07 | 1875 | * From scsi host template. |
42e9a92f RL |
1876 | * send ABTS to the target device and wait for the response |
1877 | * sc_cmd is the pointer to the command to be aborted. | |
1878 | */ | |
1879 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
1880 | { | |
1881 | struct fc_fcp_pkt *fsp; | |
1882 | struct fc_lport *lp; | |
1883 | int rc = FAILED; | |
1884 | unsigned long flags; | |
1885 | ||
1886 | lp = shost_priv(sc_cmd->device->host); | |
1887 | if (lp->state != LPORT_ST_READY) | |
1888 | return rc; | |
bc0e17f6 | 1889 | else if (!lp->link_up) |
42e9a92f RL |
1890 | return rc; |
1891 | ||
1892 | spin_lock_irqsave(lp->host->host_lock, flags); | |
1893 | fsp = CMD_SP(sc_cmd); | |
1894 | if (!fsp) { | |
1895 | /* command completed while scsi eh was setting up */ | |
1896 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1897 | return SUCCESS; | |
1898 | } | |
1899 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
1900 | fc_fcp_pkt_hold(fsp); | |
1901 | spin_unlock_irqrestore(lp->host->host_lock, flags); | |
1902 | ||
1903 | if (fc_fcp_lock_pkt(fsp)) { | |
1904 | /* completed while we were waiting for timer to be deleted */ | |
1905 | rc = SUCCESS; | |
1906 | goto release_pkt; | |
1907 | } | |
1908 | ||
c340111d | 1909 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
1910 | fc_fcp_unlock_pkt(fsp); |
1911 | ||
1912 | release_pkt: | |
1913 | fc_fcp_pkt_release(fsp); | |
1914 | return rc; | |
1915 | } | |
1916 | EXPORT_SYMBOL(fc_eh_abort); | |
1917 | ||
1918 | /** | |
34f42a07 | 1919 | * fc_eh_device_reset() Reset a single LUN |
42e9a92f RL |
1920 | * @sc_cmd: scsi command |
1921 | * | |
1922 | * Set from scsi host template to send tm cmd to the target and wait for the | |
1923 | * response. | |
1924 | */ | |
1925 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
1926 | { | |
1927 | struct fc_lport *lp; | |
1928 | struct fc_fcp_pkt *fsp; | |
1929 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
1930 | int rc = FAILED; | |
1931 | struct fc_rport_libfc_priv *rp; | |
1932 | int rval; | |
1933 | ||
1934 | rval = fc_remote_port_chkready(rport); | |
1935 | if (rval) | |
1936 | goto out; | |
1937 | ||
1938 | rp = rport->dd_data; | |
1939 | lp = shost_priv(sc_cmd->device->host); | |
1940 | ||
1941 | if (lp->state != LPORT_ST_READY) | |
1942 | return rc; | |
1943 | ||
7414705e RL |
1944 | FC_SCSI_DBG(lp, "Resetting rport (%6x)\n", rport->port_id); |
1945 | ||
42e9a92f RL |
1946 | fsp = fc_fcp_pkt_alloc(lp, GFP_NOIO); |
1947 | if (fsp == NULL) { | |
7414705e | 1948 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
1949 | sc_cmd->result = DID_NO_CONNECT << 16; |
1950 | goto out; | |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
1955 | * the sc passed in is not setup for execution like when sent | |
1956 | * through the queuecommand callout. | |
1957 | */ | |
1958 | fsp->lp = lp; /* save the softc ptr */ | |
1959 | fsp->rport = rport; /* set the remote port ptr */ | |
1960 | ||
1961 | /* | |
1962 | * flush outstanding commands | |
1963 | */ | |
1964 | rc = fc_lun_reset(lp, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); | |
1965 | fsp->state = FC_SRB_FREE; | |
1966 | fc_fcp_pkt_release(fsp); | |
1967 | ||
1968 | out: | |
1969 | return rc; | |
1970 | } | |
1971 | EXPORT_SYMBOL(fc_eh_device_reset); | |
1972 | ||
1973 | /** | |
34f42a07 | 1974 | * fc_eh_host_reset() - The reset function will reset the ports on the host. |
42e9a92f RL |
1975 | * @sc_cmd: scsi command |
1976 | */ | |
1977 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
1978 | { | |
1979 | struct Scsi_Host *shost = sc_cmd->device->host; | |
1980 | struct fc_lport *lp = shost_priv(shost); | |
1981 | unsigned long wait_tmo; | |
1982 | ||
7414705e RL |
1983 | FC_SCSI_DBG(lp, "Resetting host\n"); |
1984 | ||
42e9a92f RL |
1985 | lp->tt.lport_reset(lp); |
1986 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; | |
1987 | while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo)) | |
1988 | msleep(1000); | |
1989 | ||
1990 | if (fc_fcp_lport_queue_ready(lp)) { | |
7414705e RL |
1991 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
1992 | "on port (%6x)\n", fc_host_port_id(lp->host)); | |
42e9a92f RL |
1993 | return SUCCESS; |
1994 | } else { | |
7414705e RL |
1995 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
1996 | "port (%6x) is not ready.\n", | |
1997 | fc_host_port_id(lp->host)); | |
42e9a92f RL |
1998 | return FAILED; |
1999 | } | |
2000 | } | |
2001 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2002 | ||
2003 | /** | |
34f42a07 | 2004 | * fc_slave_alloc() - configure queue depth |
42e9a92f RL |
2005 | * @sdev: scsi device |
2006 | * | |
2007 | * Configures queue depth based on host's cmd_per_len. If not set | |
2008 | * then we use the libfc default. | |
2009 | */ | |
2010 | int fc_slave_alloc(struct scsi_device *sdev) | |
2011 | { | |
2012 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2013 | |
2014 | if (!rport || fc_remote_port_chkready(rport)) | |
2015 | return -ENXIO; | |
2016 | ||
14caf44c VD |
2017 | if (sdev->tagged_supported) |
2018 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2019 | else | |
2020 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2021 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2022 | ||
42e9a92f RL |
2023 | return 0; |
2024 | } | |
2025 | EXPORT_SYMBOL(fc_slave_alloc); | |
2026 | ||
e881a172 | 2027 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2028 | { |
5c20848a MC |
2029 | switch (reason) { |
2030 | case SCSI_QDEPTH_DEFAULT: | |
2031 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2032 | break; | |
2033 | case SCSI_QDEPTH_QFULL: | |
2034 | scsi_track_queue_full(sdev, qdepth); | |
2035 | break; | |
229b8d72 VD |
2036 | case SCSI_QDEPTH_RAMP_UP: |
2037 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2038 | break; | |
5c20848a | 2039 | default: |
e881a172 | 2040 | return -EOPNOTSUPP; |
5c20848a | 2041 | } |
42e9a92f RL |
2042 | return sdev->queue_depth; |
2043 | } | |
2044 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2045 | ||
2046 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) | |
2047 | { | |
2048 | if (sdev->tagged_supported) { | |
2049 | scsi_set_tag_type(sdev, tag_type); | |
2050 | if (tag_type) | |
2051 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2052 | else | |
2053 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2054 | } else | |
2055 | tag_type = 0; | |
2056 | ||
2057 | return tag_type; | |
2058 | } | |
2059 | EXPORT_SYMBOL(fc_change_queue_type); | |
2060 | ||
2061 | void fc_fcp_destroy(struct fc_lport *lp) | |
2062 | { | |
2063 | struct fc_fcp_internal *si = fc_get_scsi_internal(lp); | |
2064 | ||
2065 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e RL |
2066 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
2067 | "port (%6x)\n", fc_host_port_id(lp->host)); | |
42e9a92f RL |
2068 | |
2069 | mempool_destroy(si->scsi_pkt_pool); | |
2070 | kfree(si); | |
2071 | lp->scsi_priv = NULL; | |
2072 | } | |
2073 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2074 | ||
93e6d5ab RL |
2075 | int fc_setup_fcp() |
2076 | { | |
2077 | int rc = 0; | |
2078 | ||
2079 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2080 | sizeof(struct fc_fcp_pkt), | |
2081 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2082 | if (!scsi_pkt_cachep) { | |
2083 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2084 | "module load failed!"); | |
2085 | rc = -ENOMEM; | |
2086 | } | |
2087 | ||
2088 | return rc; | |
2089 | } | |
2090 | ||
2091 | void fc_destroy_fcp() | |
2092 | { | |
2093 | if (scsi_pkt_cachep) | |
2094 | kmem_cache_destroy(scsi_pkt_cachep); | |
2095 | } | |
2096 | ||
42e9a92f RL |
2097 | int fc_fcp_init(struct fc_lport *lp) |
2098 | { | |
2099 | int rc; | |
2100 | struct fc_fcp_internal *si; | |
2101 | ||
2102 | if (!lp->tt.fcp_cmd_send) | |
2103 | lp->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
2104 | ||
2105 | if (!lp->tt.fcp_cleanup) | |
2106 | lp->tt.fcp_cleanup = fc_fcp_cleanup; | |
2107 | ||
2108 | if (!lp->tt.fcp_abort_io) | |
2109 | lp->tt.fcp_abort_io = fc_fcp_abort_io; | |
2110 | ||
2111 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2112 | if (!si) | |
2113 | return -ENOMEM; | |
2114 | lp->scsi_priv = si; | |
2115 | INIT_LIST_HEAD(&si->scsi_pkt_queue); | |
2116 | ||
2117 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2118 | if (!si->scsi_pkt_pool) { | |
2119 | rc = -ENOMEM; | |
2120 | goto free_internal; | |
2121 | } | |
2122 | return 0; | |
2123 | ||
2124 | free_internal: | |
2125 | kfree(si); | |
2126 | return rc; | |
2127 | } | |
2128 | EXPORT_SYMBOL(fc_fcp_init); |