Commit | Line | Data |
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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 | ||
3a3b42bf RL |
70 | /** |
71 | * struct fc_fcp_internal - FCP layer internal data | |
72 | * @scsi_pkt_pool: Memory pool to draw FCP packets from | |
73 | * @scsi_pkt_queue: Current FCP packets | |
74 | * @throttled: The FCP packet queue is throttled | |
75 | */ | |
42e9a92f | 76 | struct fc_fcp_internal { |
3a3b42bf | 77 | mempool_t *scsi_pkt_pool; |
42e9a92f | 78 | struct list_head scsi_pkt_queue; |
3a3b42bf | 79 | u8 throttled; |
42e9a92f RL |
80 | }; |
81 | ||
82 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
83 | ||
84 | /* | |
85 | * function prototypes | |
86 | * FC scsi I/O related functions | |
87 | */ | |
88 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
89 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
90 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
91 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
92 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 93 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
42e9a92f | 94 | static void fc_timeout_error(struct fc_fcp_pkt *); |
3a3b42bf | 95 | static void fc_fcp_timeout(unsigned long); |
42e9a92f RL |
96 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
97 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
98 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
99 | static void fc_io_compl(struct fc_fcp_pkt *); | |
100 | ||
101 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
102 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
103 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
104 | ||
105 | /* | |
106 | * command status codes | |
107 | */ | |
108 | #define FC_COMPLETE 0 | |
109 | #define FC_CMD_ABORTED 1 | |
110 | #define FC_CMD_RESET 2 | |
111 | #define FC_CMD_PLOGO 3 | |
112 | #define FC_SNS_RCV 4 | |
113 | #define FC_TRANS_ERR 5 | |
114 | #define FC_DATA_OVRRUN 6 | |
115 | #define FC_DATA_UNDRUN 7 | |
116 | #define FC_ERROR 8 | |
117 | #define FC_HRD_ERROR 9 | |
118 | #define FC_CMD_TIME_OUT 10 | |
119 | ||
120 | /* | |
121 | * Error recovery timeout values. | |
122 | */ | |
123 | #define FC_SCSI_ER_TIMEOUT (10 * HZ) | |
124 | #define FC_SCSI_TM_TOV (10 * HZ) | |
125 | #define FC_SCSI_REC_TOV (2 * HZ) | |
126 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) | |
127 | ||
128 | #define FC_MAX_ERROR_CNT 5 | |
129 | #define FC_MAX_RECOV_RETRY 3 | |
130 | ||
131 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
132 | ||
133 | /** | |
3a3b42bf RL |
134 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
135 | * @lport: The local port that the FCP packet is for | |
136 | * @gfp: GFP flags for allocation | |
42e9a92f | 137 | * |
3a3b42bf RL |
138 | * Return value: fcp_pkt structure or null on allocation failure. |
139 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 140 | */ |
3a3b42bf | 141 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 142 | { |
3a3b42bf | 143 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
144 | struct fc_fcp_pkt *fsp; |
145 | ||
146 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
147 | if (fsp) { | |
148 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 149 | fsp->lp = lport; |
42e9a92f RL |
150 | atomic_set(&fsp->ref_cnt, 1); |
151 | init_timer(&fsp->timer); | |
152 | INIT_LIST_HEAD(&fsp->list); | |
153 | spin_lock_init(&fsp->scsi_pkt_lock); | |
154 | } | |
155 | return fsp; | |
156 | } | |
157 | ||
158 | /** | |
3a3b42bf RL |
159 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
160 | * @fsp: The FCP packet to be released | |
42e9a92f | 161 | * |
3a3b42bf RL |
162 | * Context: Can be called from process or interrupt context, |
163 | * no lock is required. | |
42e9a92f RL |
164 | */ |
165 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
166 | { | |
167 | if (atomic_dec_and_test(&fsp->ref_cnt)) { | |
168 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); | |
169 | ||
170 | mempool_free(fsp, si->scsi_pkt_pool); | |
171 | } | |
172 | } | |
173 | ||
3a3b42bf RL |
174 | /** |
175 | * fc_fcp_pkt_hold() - Hold a fcp_pkt | |
176 | * @fsp: The FCP packet to be held | |
177 | */ | |
42e9a92f RL |
178 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
179 | { | |
180 | atomic_inc(&fsp->ref_cnt); | |
181 | } | |
182 | ||
183 | /** | |
3a3b42bf RL |
184 | * fc_fcp_pkt_destory() - Release hold on a fcp_pkt |
185 | * @seq: The sequence that the FCP packet is on (required by destructor API) | |
186 | * @fsp: The FCP packet to be released | |
187 | * | |
188 | * This routine is called by a destructor callback in the exch_seq_send() | |
189 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required | |
190 | * argument even though it is not used by this routine. | |
42e9a92f | 191 | * |
3a3b42bf | 192 | * Context: No locking required. |
42e9a92f RL |
193 | */ |
194 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
195 | { | |
196 | fc_fcp_pkt_release(fsp); | |
197 | } | |
198 | ||
199 | /** | |
3a3b42bf RL |
200 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
201 | * @fsp: The FCP packet to be locked and incremented | |
42e9a92f | 202 | * |
3a3b42bf | 203 | * We should only return error if we return a command to SCSI-ml before |
42e9a92f RL |
204 | * getting a response. This can happen in cases where we send a abort, but |
205 | * do not wait for the response and the abort and command can be passing | |
206 | * each other on the wire/network-layer. | |
207 | * | |
208 | * Note: this function locks the packet and gets a reference to allow | |
209 | * callers to call the completion function while the lock is held and | |
210 | * not have to worry about the packets refcount. | |
211 | * | |
212 | * TODO: Maybe we should just have callers grab/release the lock and | |
213 | * have a function that they call to verify the fsp and grab a ref if | |
214 | * needed. | |
215 | */ | |
216 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
217 | { | |
218 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
219 | if (fsp->state & FC_SRB_COMPL) { | |
220 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
221 | return -EPERM; | |
222 | } | |
223 | ||
224 | fc_fcp_pkt_hold(fsp); | |
225 | return 0; | |
226 | } | |
227 | ||
3a3b42bf RL |
228 | /** |
229 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its | |
230 | * reference count | |
231 | * @fsp: The FCP packet to be unlocked and decremented | |
232 | */ | |
42e9a92f RL |
233 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
234 | { | |
235 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
236 | fc_fcp_pkt_release(fsp); | |
237 | } | |
238 | ||
3a3b42bf RL |
239 | /** |
240 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt | |
241 | * @fsp: The FCP packet to start a timer for | |
242 | * @delay: The timeout period for the timer | |
243 | */ | |
42e9a92f RL |
244 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
245 | { | |
246 | if (!(fsp->state & FC_SRB_COMPL)) | |
247 | mod_timer(&fsp->timer, jiffies + delay); | |
248 | } | |
249 | ||
3a3b42bf RL |
250 | /** |
251 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a | |
252 | * fcp_pkt | |
253 | * @fsp: The FCP packet to abort exchanges on | |
254 | */ | |
42e9a92f RL |
255 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
256 | { | |
257 | if (!fsp->seq_ptr) | |
258 | return -EINVAL; | |
259 | ||
260 | fsp->state |= FC_SRB_ABORT_PENDING; | |
261 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); | |
262 | } | |
263 | ||
3a3b42bf RL |
264 | /** |
265 | * fc_fcp_retry_cmd() - Retry a fcp_pkt | |
266 | * @fsp: The FCP packet to be retried | |
267 | * | |
268 | * Sets the status code to be FC_ERROR and then calls | |
269 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). | |
270 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. | |
271 | * The SCSI-ml will retry the command. | |
42e9a92f RL |
272 | */ |
273 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) | |
274 | { | |
275 | if (fsp->seq_ptr) { | |
276 | fsp->lp->tt.exch_done(fsp->seq_ptr); | |
277 | fsp->seq_ptr = NULL; | |
278 | } | |
279 | ||
280 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 281 | fsp->io_status = 0; |
42e9a92f RL |
282 | fsp->status_code = FC_ERROR; |
283 | fc_fcp_complete_locked(fsp); | |
284 | } | |
285 | ||
3a3b42bf RL |
286 | /** |
287 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context | |
288 | * @fsp: The FCP packet that will manage the DDP frames | |
289 | * @xid: The XID that will be used for the DDP exchange | |
b277d2aa YZ |
290 | */ |
291 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
292 | { | |
3a3b42bf | 293 | struct fc_lport *lport; |
b277d2aa YZ |
294 | |
295 | if (!fsp) | |
296 | return; | |
297 | ||
3a3b42bf | 298 | lport = fsp->lp; |
b277d2aa | 299 | if ((fsp->req_flags & FC_SRB_READ) && |
3a3b42bf RL |
300 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
301 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), | |
302 | scsi_sg_count(fsp->cmd))) | |
b277d2aa YZ |
303 | fsp->xfer_ddp = xid; |
304 | } | |
305 | } | |
b277d2aa | 306 | |
3a3b42bf RL |
307 | /** |
308 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any | |
309 | * DDP related resources for a fcp_pkt | |
310 | * @fsp: The FCP packet that DDP had been used on | |
b277d2aa YZ |
311 | */ |
312 | static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) | |
313 | { | |
3a3b42bf | 314 | struct fc_lport *lport; |
b277d2aa YZ |
315 | |
316 | if (!fsp) | |
317 | return; | |
318 | ||
5e472d07 YZ |
319 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
320 | return; | |
321 | ||
3a3b42bf RL |
322 | lport = fsp->lp; |
323 | if (lport->tt.ddp_done) { | |
324 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); | |
5e472d07 | 325 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
326 | } |
327 | } | |
328 | ||
3a3b42bf RL |
329 | /** |
330 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
331 | * @fsp: The FCP packet the data is on | |
332 | * @fp: The data frame | |
42e9a92f RL |
333 | */ |
334 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
335 | { | |
336 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 337 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
338 | struct fcoe_dev_stats *stats; |
339 | struct fc_frame_header *fh; | |
340 | size_t start_offset; | |
341 | size_t offset; | |
342 | u32 crc; | |
343 | u32 copy_len = 0; | |
344 | size_t len; | |
345 | void *buf; | |
346 | struct scatterlist *sg; | |
58682874 | 347 | u32 nents; |
42e9a92f RL |
348 | |
349 | fh = fc_frame_header_get(fp); | |
350 | offset = ntohl(fh->fh_parm_offset); | |
351 | start_offset = offset; | |
352 | len = fr_len(fp) - sizeof(*fh); | |
353 | buf = fc_frame_payload_get(fp, 0); | |
354 | ||
b277d2aa YZ |
355 | /* if this I/O is ddped, update xfer len */ |
356 | fc_fcp_ddp_done(fsp); | |
357 | ||
42e9a92f | 358 | if (offset + len > fsp->data_len) { |
34f42a07 | 359 | /* this should never happen */ |
42e9a92f RL |
360 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
361 | fc_frame_crc_check(fp)) | |
362 | goto crc_err; | |
7414705e RL |
363 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
364 | "data_len %x\n", len, offset, fsp->data_len); | |
42e9a92f RL |
365 | fc_fcp_retry_cmd(fsp); |
366 | return; | |
367 | } | |
368 | if (offset != fsp->xfer_len) | |
369 | fsp->state |= FC_SRB_DISCONTIG; | |
370 | ||
42e9a92f | 371 | sg = scsi_sglist(sc); |
58682874 | 372 | nents = scsi_sg_count(sc); |
42e9a92f | 373 | |
58682874 RL |
374 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
375 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
376 | &offset, KM_SOFTIRQ0, NULL); | |
377 | } else { | |
378 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
379 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
380 | &offset, KM_SOFTIRQ0, &crc); | |
42e9a92f | 381 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 382 | if (len % 4) |
42e9a92f | 383 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
384 | |
385 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
386 | crc_err: | |
3a3b42bf | 387 | stats = fc_lport_get_stats(lport); |
42e9a92f | 388 | stats->ErrorFrames++; |
582b45bc | 389 | /* FIXME - per cpu count, not total count! */ |
42e9a92f | 390 | if (stats->InvalidCRCCount++ < 5) |
7414705e RL |
391 | printk(KERN_WARNING "libfc: CRC error on data " |
392 | "frame for port (%6x)\n", | |
3a3b42bf | 393 | fc_host_port_id(lport->host)); |
42e9a92f RL |
394 | /* |
395 | * Assume the frame is total garbage. | |
396 | * We may have copied it over the good part | |
397 | * of the buffer. | |
398 | * If so, we need to retry the entire operation. | |
399 | * Otherwise, ignore it. | |
400 | */ | |
401 | if (fsp->state & FC_SRB_DISCONTIG) | |
402 | fc_fcp_retry_cmd(fsp); | |
403 | return; | |
404 | } | |
405 | } | |
406 | ||
407 | if (fsp->xfer_contig_end == start_offset) | |
408 | fsp->xfer_contig_end += copy_len; | |
409 | fsp->xfer_len += copy_len; | |
410 | ||
411 | /* | |
412 | * In the very rare event that this data arrived after the response | |
413 | * and completes the transfer, call the completion handler. | |
414 | */ | |
415 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
416 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
417 | fc_fcp_complete_locked(fsp); | |
418 | } | |
419 | ||
34f42a07 | 420 | /** |
3a3b42bf RL |
421 | * fc_fcp_send_data() - Send SCSI data to a target |
422 | * @fsp: The FCP packet the data is on | |
423 | * @sp: The sequence the data is to be sent on | |
424 | * @offset: The starting offset for this data request | |
425 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
426 | * |
427 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf RL |
428 | * If the LLD is capable of sequence offload then send down the |
429 | * seq_blen ammount of data in single frame, otherwise send | |
430 | * multiple frames of the maximum frame payload supported by | |
431 | * the target port. | |
42e9a92f RL |
432 | */ |
433 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
434 | size_t offset, size_t seq_blen) | |
435 | { | |
436 | struct fc_exch *ep; | |
437 | struct scsi_cmnd *sc; | |
438 | struct scatterlist *sg; | |
439 | struct fc_frame *fp = NULL; | |
3a3b42bf | 440 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
441 | size_t remaining; |
442 | size_t t_blen; | |
443 | size_t tlen; | |
444 | size_t sg_bytes; | |
445 | size_t frame_offset, fh_parm_offset; | |
446 | int error; | |
447 | void *data = NULL; | |
448 | void *page_addr; | |
3a3b42bf | 449 | int using_sg = lport->sg_supp; |
42e9a92f RL |
450 | u32 f_ctl; |
451 | ||
452 | WARN_ON(seq_blen <= 0); | |
453 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
454 | /* this should never happen */ | |
7414705e RL |
455 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
456 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
457 | fc_fcp_send_abort(fsp); |
458 | return 0; | |
459 | } else if (offset != fsp->xfer_len) { | |
460 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
461 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
462 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
463 | } |
464 | ||
465 | /* | |
466 | * if LLD is capable of seq_offload then set transport | |
467 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
468 | * to max FC frame payload previously set in fsp->max_payload. | |
469 | */ | |
276d6814 | 470 | t_blen = fsp->max_payload; |
3a3b42bf RL |
471 | if (lport->seq_offload) { |
472 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 473 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 474 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
475 | } |
476 | ||
42e9a92f RL |
477 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); |
478 | if (t_blen > 512) | |
479 | t_blen &= ~(512 - 1); /* round down to block size */ | |
480 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ | |
481 | sc = fsp->cmd; | |
482 | ||
483 | remaining = seq_blen; | |
484 | fh_parm_offset = frame_offset = offset; | |
485 | tlen = 0; | |
3a3b42bf | 486 | seq = lport->tt.seq_start_next(seq); |
42e9a92f RL |
487 | f_ctl = FC_FC_REL_OFF; |
488 | WARN_ON(!seq); | |
489 | ||
42e9a92f RL |
490 | sg = scsi_sglist(sc); |
491 | ||
492 | while (remaining > 0 && sg) { | |
493 | if (offset >= sg->length) { | |
494 | offset -= sg->length; | |
495 | sg = sg_next(sg); | |
496 | continue; | |
497 | } | |
498 | if (!fp) { | |
499 | tlen = min(t_blen, remaining); | |
500 | ||
501 | /* | |
502 | * TODO. Temporary workaround. fc_seq_send() can't | |
503 | * handle odd lengths in non-linear skbs. | |
504 | * This will be the final fragment only. | |
505 | */ | |
506 | if (tlen % 4) | |
507 | using_sg = 0; | |
a7bbc7f4 VD |
508 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
509 | if (!fp) | |
510 | return -ENOMEM; | |
511 | ||
512 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
513 | fh_parm_offset = frame_offset; |
514 | fr_max_payload(fp) = fsp->max_payload; | |
515 | } | |
516 | sg_bytes = min(tlen, sg->length - offset); | |
517 | if (using_sg) { | |
42e9a92f RL |
518 | get_page(sg_page(sg)); |
519 | skb_fill_page_desc(fp_skb(fp), | |
520 | skb_shinfo(fp_skb(fp))->nr_frags, | |
521 | sg_page(sg), sg->offset + offset, | |
522 | sg_bytes); | |
523 | fp_skb(fp)->data_len += sg_bytes; | |
524 | fr_len(fp) += sg_bytes; | |
525 | fp_skb(fp)->truesize += PAGE_SIZE; | |
526 | } else { | |
527 | size_t off = offset + sg->offset; | |
528 | ||
529 | /* | |
530 | * The scatterlist item may be bigger than PAGE_SIZE, | |
531 | * but we must not cross pages inside the kmap. | |
532 | */ | |
533 | sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE - | |
534 | (off & ~PAGE_MASK))); | |
535 | page_addr = kmap_atomic(sg_page(sg) + | |
536 | (off >> PAGE_SHIFT), | |
537 | KM_SOFTIRQ0); | |
538 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), | |
539 | sg_bytes); | |
540 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
541 | data += sg_bytes; | |
542 | } | |
543 | offset += sg_bytes; | |
544 | frame_offset += sg_bytes; | |
545 | tlen -= sg_bytes; | |
546 | remaining -= sg_bytes; | |
547 | ||
d37322a4 YZ |
548 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
549 | (tlen)) | |
42e9a92f RL |
550 | continue; |
551 | ||
552 | /* | |
553 | * Send sequence with transfer sequence initiative in case | |
554 | * this is last FCP frame of the sequence. | |
555 | */ | |
556 | if (remaining == 0) | |
557 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
558 | ||
559 | ep = fc_seq_exch(seq); | |
560 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
561 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
562 | ||
563 | /* | |
564 | * send fragment using for a sequence. | |
565 | */ | |
3a3b42bf | 566 | error = lport->tt.seq_send(lport, seq, fp); |
42e9a92f RL |
567 | if (error) { |
568 | WARN_ON(1); /* send error should be rare */ | |
569 | fc_fcp_retry_cmd(fsp); | |
570 | return 0; | |
571 | } | |
572 | fp = NULL; | |
573 | } | |
574 | fsp->xfer_len += seq_blen; /* premature count? */ | |
575 | return 0; | |
576 | } | |
577 | ||
3a3b42bf RL |
578 | /** |
579 | * fc_fcp_abts_resp() - Send an ABTS response | |
580 | * @fsp: The FCP packet that is being aborted | |
581 | * @fp: The response frame | |
582 | */ | |
42e9a92f RL |
583 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
584 | { | |
585 | int ba_done = 1; | |
586 | struct fc_ba_rjt *brp; | |
587 | struct fc_frame_header *fh; | |
588 | ||
589 | fh = fc_frame_header_get(fp); | |
590 | switch (fh->fh_r_ctl) { | |
591 | case FC_RCTL_BA_ACC: | |
592 | break; | |
593 | case FC_RCTL_BA_RJT: | |
594 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
595 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
596 | break; | |
597 | /* fall thru */ | |
598 | default: | |
599 | /* | |
600 | * we will let the command timeout | |
601 | * and scsi-ml recover in this case, | |
602 | * therefore cleared the ba_done flag. | |
603 | */ | |
604 | ba_done = 0; | |
605 | } | |
606 | ||
607 | if (ba_done) { | |
608 | fsp->state |= FC_SRB_ABORTED; | |
609 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
610 | ||
611 | if (fsp->wait_for_comp) | |
612 | complete(&fsp->tm_done); | |
613 | else | |
614 | fc_fcp_complete_locked(fsp); | |
615 | } | |
616 | } | |
617 | ||
34f42a07 | 618 | /** |
3a3b42bf RL |
619 | * fc_fcp_reduce_can_queue() - Reduce the can_queue value for a local port |
620 | * @lport: The local port to reduce can_queue on | |
42e9a92f RL |
621 | * |
622 | * If we are getting memory allocation failures, then we may | |
623 | * be trying to execute too many commands. We let the running | |
624 | * commands complete or timeout, then try again with a reduced | |
625 | * can_queue. Eventually we will hit the point where we run | |
626 | * on all reserved structs. | |
627 | */ | |
3a3b42bf | 628 | static void fc_fcp_reduce_can_queue(struct fc_lport *lport) |
42e9a92f | 629 | { |
3a3b42bf | 630 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
631 | unsigned long flags; |
632 | int can_queue; | |
633 | ||
3a3b42bf | 634 | spin_lock_irqsave(lport->host->host_lock, flags); |
42e9a92f RL |
635 | if (si->throttled) |
636 | goto done; | |
637 | si->throttled = 1; | |
638 | ||
3a3b42bf | 639 | can_queue = lport->host->can_queue; |
42e9a92f RL |
640 | can_queue >>= 1; |
641 | if (!can_queue) | |
642 | can_queue = 1; | |
3a3b42bf RL |
643 | lport->host->can_queue = can_queue; |
644 | shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" | |
42e9a92f RL |
645 | "Reducing can_queue to %d.\n", can_queue); |
646 | done: | |
3a3b42bf | 647 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
648 | } |
649 | ||
34f42a07 | 650 | /** |
3a3b42bf | 651 | * fc_fcp_recv() - Reveive an FCP frame |
34f42a07 | 652 | * @seq: The sequence the frame is on |
3a3b42bf | 653 | * @fp: The received frame |
34f42a07 | 654 | * @arg: The related FCP packet |
42e9a92f | 655 | * |
3a3b42bf RL |
656 | * Context: Called from Soft IRQ context. Can not be called |
657 | * holding the FCP packet list lock. | |
42e9a92f RL |
658 | */ |
659 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
660 | { | |
661 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 662 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
663 | struct fc_frame_header *fh; |
664 | struct fcp_txrdy *dd; | |
665 | u8 r_ctl; | |
666 | int rc = 0; | |
667 | ||
668 | if (IS_ERR(fp)) | |
669 | goto errout; | |
670 | ||
671 | fh = fc_frame_header_get(fp); | |
672 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 673 | |
a29e7646 | 674 | if (!(lport->state & LPORT_ST_READY)) |
42e9a92f RL |
675 | goto out; |
676 | if (fc_fcp_lock_pkt(fsp)) | |
677 | goto out; | |
678 | fsp->last_pkt_time = jiffies; | |
679 | ||
680 | if (fh->fh_type == FC_TYPE_BLS) { | |
681 | fc_fcp_abts_resp(fsp, fp); | |
682 | goto unlock; | |
683 | } | |
684 | ||
685 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
686 | goto unlock; | |
687 | ||
688 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
689 | /* | |
690 | * received XFER RDY from the target | |
691 | * need to send data to the target | |
692 | */ | |
693 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
694 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
695 | WARN_ON(!dd); | |
696 | ||
697 | rc = fc_fcp_send_data(fsp, seq, | |
698 | (size_t) ntohl(dd->ft_data_ro), | |
699 | (size_t) ntohl(dd->ft_burst_len)); | |
700 | if (!rc) | |
701 | seq->rec_data = fsp->xfer_len; | |
702 | else if (rc == -ENOMEM) | |
703 | fsp->state |= FC_SRB_NOMEM; | |
704 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { | |
705 | /* | |
706 | * received a DATA frame | |
707 | * next we will copy the data to the system buffer | |
708 | */ | |
709 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
710 | fc_fcp_recv_data(fsp, fp); | |
711 | seq->rec_data = fsp->xfer_contig_end; | |
712 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
713 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
714 | ||
715 | fc_fcp_resp(fsp, fp); | |
716 | } else { | |
7414705e | 717 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
718 | } |
719 | unlock: | |
720 | fc_fcp_unlock_pkt(fsp); | |
721 | out: | |
722 | fc_frame_free(fp); | |
723 | errout: | |
724 | if (IS_ERR(fp)) | |
725 | fc_fcp_error(fsp, fp); | |
726 | else if (rc == -ENOMEM) | |
a29e7646 | 727 | fc_fcp_reduce_can_queue(lport); |
42e9a92f RL |
728 | } |
729 | ||
3a3b42bf RL |
730 | /** |
731 | * fc_fcp_resp() - Handler for FCP responses | |
732 | * @fsp: The FCP packet the response is for | |
733 | * @fp: The response frame | |
734 | */ | |
42e9a92f RL |
735 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
736 | { | |
737 | struct fc_frame_header *fh; | |
738 | struct fcp_resp *fc_rp; | |
739 | struct fcp_resp_ext *rp_ex; | |
740 | struct fcp_resp_rsp_info *fc_rp_info; | |
741 | u32 plen; | |
742 | u32 expected_len; | |
743 | u32 respl = 0; | |
744 | u32 snsl = 0; | |
745 | u8 flags = 0; | |
746 | ||
747 | plen = fr_len(fp); | |
748 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
749 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
750 | goto len_err; | |
751 | plen -= sizeof(*fh); | |
752 | fc_rp = (struct fcp_resp *)(fh + 1); | |
753 | fsp->cdb_status = fc_rp->fr_status; | |
754 | flags = fc_rp->fr_flags; | |
755 | fsp->scsi_comp_flags = flags; | |
756 | expected_len = fsp->data_len; | |
757 | ||
b277d2aa YZ |
758 | /* if ddp, update xfer len */ |
759 | fc_fcp_ddp_done(fsp); | |
760 | ||
42e9a92f RL |
761 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
762 | rp_ex = (void *)(fc_rp + 1); | |
763 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
764 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
765 | goto len_err; | |
766 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
767 | if (flags & FCP_RSP_LEN_VAL) { | |
768 | respl = ntohl(rp_ex->fr_rsp_len); | |
769 | if (respl != sizeof(*fc_rp_info)) | |
770 | goto len_err; | |
771 | if (fsp->wait_for_comp) { | |
772 | /* Abuse cdb_status for rsp code */ | |
773 | fsp->cdb_status = fc_rp_info->rsp_code; | |
774 | complete(&fsp->tm_done); | |
775 | /* | |
776 | * tmfs will not have any scsi cmd so | |
777 | * exit here | |
778 | */ | |
779 | return; | |
780 | } else | |
781 | goto err; | |
782 | } | |
783 | if (flags & FCP_SNS_LEN_VAL) { | |
784 | snsl = ntohl(rp_ex->fr_sns_len); | |
785 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
786 | snsl = SCSI_SENSE_BUFFERSIZE; | |
787 | memcpy(fsp->cmd->sense_buffer, | |
788 | (char *)fc_rp_info + respl, snsl); | |
789 | } | |
790 | } | |
791 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
792 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
793 | goto len_err; | |
794 | if (flags & FCP_RESID_UNDER) { | |
795 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
796 | /* | |
797 | * The cmnd->underflow is the minimum number of | |
798 | * bytes that must be transfered for this | |
799 | * command. Provided a sense condition is not | |
800 | * present, make sure the actual amount | |
801 | * transferred is at least the underflow value | |
802 | * or fail. | |
803 | */ | |
804 | if (!(flags & FCP_SNS_LEN_VAL) && | |
805 | (fc_rp->fr_status == 0) && | |
806 | (scsi_bufflen(fsp->cmd) - | |
807 | fsp->scsi_resid) < fsp->cmd->underflow) | |
808 | goto err; | |
809 | expected_len -= fsp->scsi_resid; | |
810 | } else { | |
811 | fsp->status_code = FC_ERROR; | |
812 | } | |
813 | } | |
814 | } | |
815 | fsp->state |= FC_SRB_RCV_STATUS; | |
816 | ||
817 | /* | |
818 | * Check for missing or extra data frames. | |
819 | */ | |
820 | if (unlikely(fsp->xfer_len != expected_len)) { | |
821 | if (fsp->xfer_len < expected_len) { | |
822 | /* | |
823 | * Some data may be queued locally, | |
824 | * Wait a at least one jiffy to see if it is delivered. | |
825 | * If this expires without data, we may do SRR. | |
826 | */ | |
827 | fc_fcp_timer_set(fsp, 2); | |
828 | return; | |
829 | } | |
830 | fsp->status_code = FC_DATA_OVRRUN; | |
7414705e RL |
831 | FC_FCP_DBG(fsp, "tgt %6x xfer len %zx greater than expected, " |
832 | "len %x, data len %x\n", | |
833 | fsp->rport->port_id, | |
834 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
835 | } |
836 | fc_fcp_complete_locked(fsp); | |
837 | return; | |
838 | ||
839 | len_err: | |
7414705e RL |
840 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
841 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
842 | err: |
843 | fsp->status_code = FC_ERROR; | |
844 | fc_fcp_complete_locked(fsp); | |
845 | } | |
846 | ||
847 | /** | |
3a3b42bf RL |
848 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
849 | * fcp_pkt lock held | |
850 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
851 | * |
852 | * This function may sleep if a timer is pending. The packet lock must be | |
853 | * held, and the host lock must not be held. | |
854 | */ | |
855 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
856 | { | |
3a3b42bf | 857 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
858 | struct fc_seq *seq; |
859 | struct fc_exch *ep; | |
860 | u32 f_ctl; | |
861 | ||
862 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
863 | return; | |
864 | ||
865 | if (fsp->state & FC_SRB_ABORTED) { | |
866 | if (!fsp->status_code) | |
867 | fsp->status_code = FC_CMD_ABORTED; | |
868 | } else { | |
869 | /* | |
870 | * Test for transport underrun, independent of response | |
871 | * underrun status. | |
872 | */ | |
873 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
874 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
875 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
876 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 877 | fsp->io_status = 0; |
42e9a92f RL |
878 | } |
879 | } | |
880 | ||
881 | seq = fsp->seq_ptr; | |
882 | if (seq) { | |
883 | fsp->seq_ptr = NULL; | |
884 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
885 | struct fc_frame *conf_frame; | |
886 | struct fc_seq *csp; | |
887 | ||
3a3b42bf | 888 | csp = lport->tt.seq_start_next(seq); |
42e9a92f RL |
889 | conf_frame = fc_frame_alloc(fsp->lp, 0); |
890 | if (conf_frame) { | |
891 | f_ctl = FC_FC_SEQ_INIT; | |
892 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
893 | ep = fc_seq_exch(seq); | |
894 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
895 | ep->did, ep->sid, | |
896 | FC_TYPE_FCP, f_ctl, 0); | |
3a3b42bf | 897 | lport->tt.seq_send(lport, csp, conf_frame); |
42e9a92f RL |
898 | } |
899 | } | |
3a3b42bf | 900 | lport->tt.exch_done(seq); |
42e9a92f RL |
901 | } |
902 | fc_io_compl(fsp); | |
903 | } | |
904 | ||
3a3b42bf RL |
905 | /** |
906 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
907 | * @fsp: The FCP packet whose exchanges should be canceled | |
908 | * @error: The reason for the cancellation | |
909 | */ | |
42e9a92f RL |
910 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
911 | { | |
3a3b42bf | 912 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
913 | |
914 | if (fsp->seq_ptr) { | |
3a3b42bf | 915 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
916 | fsp->seq_ptr = NULL; |
917 | } | |
918 | fsp->status_code = error; | |
919 | } | |
920 | ||
921 | /** | |
3a3b42bf RL |
922 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
923 | * @lport: The local port whose exchanges should be canceled | |
924 | * @id: The target's ID | |
925 | * @lun: The LUN | |
926 | * @error: The reason for cancellation | |
42e9a92f RL |
927 | * |
928 | * If lun or id is -1, they are ignored. | |
929 | */ | |
3a3b42bf | 930 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
931 | unsigned int lun, int error) |
932 | { | |
3a3b42bf | 933 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
934 | struct fc_fcp_pkt *fsp; |
935 | struct scsi_cmnd *sc_cmd; | |
936 | unsigned long flags; | |
937 | ||
3a3b42bf | 938 | spin_lock_irqsave(lport->host->host_lock, flags); |
42e9a92f RL |
939 | restart: |
940 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
941 | sc_cmd = fsp->cmd; | |
942 | if (id != -1 && scmd_id(sc_cmd) != id) | |
943 | continue; | |
944 | ||
945 | if (lun != -1 && sc_cmd->device->lun != lun) | |
946 | continue; | |
947 | ||
948 | fc_fcp_pkt_hold(fsp); | |
3a3b42bf | 949 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
950 | |
951 | if (!fc_fcp_lock_pkt(fsp)) { | |
952 | fc_fcp_cleanup_cmd(fsp, error); | |
953 | fc_io_compl(fsp); | |
954 | fc_fcp_unlock_pkt(fsp); | |
955 | } | |
956 | ||
957 | fc_fcp_pkt_release(fsp); | |
3a3b42bf | 958 | spin_lock_irqsave(lport->host->host_lock, flags); |
42e9a92f RL |
959 | /* |
960 | * while we dropped the lock multiple pkts could | |
961 | * have been released, so we have to start over. | |
962 | */ | |
963 | goto restart; | |
964 | } | |
3a3b42bf | 965 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
966 | } |
967 | ||
3a3b42bf RL |
968 | /** |
969 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
970 | * @lport: The local port whose exchanges are to be aborted | |
971 | */ | |
972 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 973 | { |
3a3b42bf | 974 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
975 | } |
976 | ||
977 | /** | |
3a3b42bf RL |
978 | * fc_fcp_pkt_send() - Send a fcp_pkt |
979 | * @lport: The local port to send the FCP packet on | |
980 | * @fsp: The FCP packet to send | |
42e9a92f | 981 | * |
3a3b42bf RL |
982 | * Return: Zero for success and -1 for failure |
983 | * Locks: Called with the host lock and irqs disabled. | |
42e9a92f | 984 | */ |
3a3b42bf | 985 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 986 | { |
3a3b42bf | 987 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
988 | int rc; |
989 | ||
990 | fsp->cmd->SCp.ptr = (char *)fsp; | |
991 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
992 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
993 | ||
994 | int_to_scsilun(fsp->cmd->device->lun, | |
995 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
996 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
997 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
998 | ||
3a3b42bf RL |
999 | spin_unlock_irq(lport->host->host_lock); |
1000 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); | |
1001 | spin_lock_irq(lport->host->host_lock); | |
42e9a92f RL |
1002 | if (rc) |
1003 | list_del(&fsp->list); | |
1004 | ||
1005 | return rc; | |
1006 | } | |
1007 | ||
3a3b42bf RL |
1008 | /** |
1009 | * fc_fcp_cmd_send() - Send a FCP command | |
1010 | * @lport: The local port to send the command on | |
1011 | * @fsp: The FCP packet the command is on | |
1012 | * @resp: The handler for the response | |
1013 | */ | |
1014 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1015 | void (*resp)(struct fc_seq *, |
1016 | struct fc_frame *fp, | |
1017 | void *arg)) | |
1018 | { | |
1019 | struct fc_frame *fp; | |
1020 | struct fc_seq *seq; | |
1021 | struct fc_rport *rport; | |
3a3b42bf | 1022 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1023 | const size_t len = sizeof(fsp->cdb_cmd); |
1024 | int rc = 0; | |
1025 | ||
1026 | if (fc_fcp_lock_pkt(fsp)) | |
1027 | return 0; | |
1028 | ||
3a3b42bf | 1029 | fp = fc_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1030 | if (!fp) { |
1031 | rc = -1; | |
1032 | goto unlock; | |
1033 | } | |
1034 | ||
1035 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1036 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1037 | rport = fsp->rport; |
1038 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1039 | rpriv = rport->dd_data; |
42e9a92f RL |
1040 | |
1041 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
3a3b42bf | 1042 | fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, |
42e9a92f RL |
1043 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
1044 | ||
3a3b42bf RL |
1045 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
1046 | fsp, 0); | |
42e9a92f | 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 | ||
3a3b42bf RL |
1064 | /** |
1065 | * fc_fcp_error() - Handler for FCP layer errors | |
1066 | * @fsp: The FCP packet the error is on | |
1067 | * @fp: The frame that has errored | |
42e9a92f RL |
1068 | */ |
1069 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1070 | { | |
1071 | int error = PTR_ERR(fp); | |
1072 | ||
1073 | if (fc_fcp_lock_pkt(fsp)) | |
1074 | return; | |
1075 | ||
7414705e | 1076 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1077 | fc_fcp_retry_cmd(fsp); |
1078 | goto unlock; | |
42e9a92f | 1079 | } |
7414705e | 1080 | |
42e9a92f RL |
1081 | /* |
1082 | * clear abort pending, because the lower layer | |
1083 | * decided to force completion. | |
1084 | */ | |
1085 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1086 | fsp->status_code = FC_CMD_PLOGO; | |
1087 | fc_fcp_complete_locked(fsp); | |
1088 | unlock: | |
1089 | fc_fcp_unlock_pkt(fsp); | |
1090 | } | |
1091 | ||
3a3b42bf RL |
1092 | /** |
1093 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1094 | * @fsp: The FCP packet to abort on | |
1095 | * | |
1096 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1097 | */ |
c340111d | 1098 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1099 | { |
1100 | int rc = FAILED; | |
1101 | ||
1102 | if (fc_fcp_send_abort(fsp)) | |
1103 | return FAILED; | |
1104 | ||
1105 | init_completion(&fsp->tm_done); | |
1106 | fsp->wait_for_comp = 1; | |
1107 | ||
1108 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1109 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1110 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1111 | fsp->wait_for_comp = 0; | |
1112 | ||
1113 | if (!rc) { | |
7414705e | 1114 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f RL |
1115 | rc = FAILED; |
1116 | } else if (fsp->state & FC_SRB_ABORTED) { | |
7414705e | 1117 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1118 | rc = SUCCESS; |
1119 | fc_fcp_complete_locked(fsp); | |
1120 | } | |
1121 | ||
1122 | return rc; | |
1123 | } | |
1124 | ||
3a3b42bf RL |
1125 | /** |
1126 | * fc_lun_reset_send() - Send LUN reset command | |
1127 | * @data: The FCP packet that identifies the LUN to be reset | |
42e9a92f RL |
1128 | */ |
1129 | static void fc_lun_reset_send(unsigned long data) | |
1130 | { | |
1131 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
3a3b42bf RL |
1132 | struct fc_lport *lport = fsp->lp; |
1133 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { | |
42e9a92f RL |
1134 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1135 | return; | |
1136 | if (fc_fcp_lock_pkt(fsp)) | |
1137 | return; | |
1138 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); | |
1139 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1140 | fc_fcp_unlock_pkt(fsp); | |
1141 | } | |
1142 | } | |
1143 | ||
3a3b42bf RL |
1144 | /** |
1145 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1146 | * and wait for the reply | |
1147 | * @lport: The local port to sent the comand on | |
1148 | * @fsp: The FCP packet that identifies the LUN to be reset | |
1149 | * @id: The SCSI command ID | |
1150 | * @lun: The LUN ID to be reset | |
42e9a92f | 1151 | */ |
3a3b42bf | 1152 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1153 | unsigned int id, unsigned int lun) |
1154 | { | |
1155 | int rc; | |
1156 | ||
1157 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1158 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1159 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1160 | ||
1161 | fsp->wait_for_comp = 1; | |
1162 | init_completion(&fsp->tm_done); | |
1163 | ||
1164 | fc_lun_reset_send((unsigned long)fsp); | |
1165 | ||
1166 | /* | |
1167 | * wait for completion of reset | |
1168 | * after that make sure all commands are terminated | |
1169 | */ | |
1170 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1171 | ||
1172 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1173 | fsp->state |= FC_SRB_COMPL; | |
1174 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1175 | ||
1176 | del_timer_sync(&fsp->timer); | |
1177 | ||
1178 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1179 | if (fsp->seq_ptr) { | |
3a3b42bf | 1180 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1181 | fsp->seq_ptr = NULL; |
1182 | } | |
1183 | fsp->wait_for_comp = 0; | |
1184 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1185 | ||
1186 | if (!rc) { | |
3a3b42bf | 1187 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1188 | return FAILED; |
1189 | } | |
1190 | ||
1191 | /* cdb_status holds the tmf's rsp code */ | |
1192 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1193 | return FAILED; | |
1194 | ||
3a3b42bf RL |
1195 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1196 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1197 | return SUCCESS; |
1198 | } | |
1199 | ||
3a3b42bf RL |
1200 | /** |
1201 | * fc_tm_done() - Task Managment response handler | |
1202 | * @seq: The sequence that the response is on | |
1203 | * @fp: The response frame | |
1204 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1205 | */ |
1206 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1207 | { | |
1208 | struct fc_fcp_pkt *fsp = arg; | |
1209 | struct fc_frame_header *fh; | |
1210 | ||
1211 | if (IS_ERR(fp)) { | |
1212 | /* | |
1213 | * If there is an error just let it timeout or wait | |
1214 | * for TMF to be aborted if it timedout. | |
1215 | * | |
1216 | * scsi-eh will escalate for when either happens. | |
1217 | */ | |
1218 | return; | |
1219 | } | |
1220 | ||
1221 | if (fc_fcp_lock_pkt(fsp)) | |
1222 | return; | |
1223 | ||
1224 | /* | |
1225 | * raced with eh timeout handler. | |
1226 | */ | |
1227 | if (!fsp->seq_ptr || !fsp->wait_for_comp) { | |
1228 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1229 | return; | |
1230 | } | |
1231 | ||
1232 | fh = fc_frame_header_get(fp); | |
1233 | if (fh->fh_type != FC_TYPE_BLS) | |
1234 | fc_fcp_resp(fsp, fp); | |
1235 | fsp->seq_ptr = NULL; | |
1236 | fsp->lp->tt.exch_done(seq); | |
1237 | fc_frame_free(fp); | |
1238 | fc_fcp_unlock_pkt(fsp); | |
1239 | } | |
1240 | ||
3a3b42bf RL |
1241 | /** |
1242 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1243 | * @lport: The local port to be cleaned up | |
1244 | */ | |
1245 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1246 | { |
3a3b42bf | 1247 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1248 | } |
1249 | ||
3a3b42bf RL |
1250 | /** |
1251 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
1252 | * @data: The FCP packet that has timed out | |
42e9a92f | 1253 | * |
3a3b42bf RL |
1254 | * If REC is supported then just issue it and return. The REC exchange will |
1255 | * complete or time out and recovery can continue at that point. Otherwise, | |
1256 | * if the response has been received without all the data it has been | |
1257 | * ER_TIMEOUT since the response was received. If the response has not been | |
1258 | * received we see if data was received recently. If it has been then we | |
1259 | * continue waiting, otherwise, we abort the command. | |
42e9a92f RL |
1260 | */ |
1261 | static void fc_fcp_timeout(unsigned long data) | |
1262 | { | |
1263 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1264 | struct fc_rport *rport = fsp->rport; | |
3a3b42bf | 1265 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1266 | |
1267 | if (fc_fcp_lock_pkt(fsp)) | |
1268 | return; | |
1269 | ||
1270 | if (fsp->cdb_cmd.fc_tm_flags) | |
1271 | goto unlock; | |
1272 | ||
1273 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1274 | ||
3a3b42bf | 1275 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
42e9a92f RL |
1276 | fc_fcp_rec(fsp); |
1277 | else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), | |
1278 | jiffies)) | |
1279 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); | |
1280 | else if (fsp->state & FC_SRB_RCV_STATUS) | |
1281 | fc_fcp_complete_locked(fsp); | |
1282 | else | |
1283 | fc_timeout_error(fsp); | |
1284 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; | |
1285 | unlock: | |
1286 | fc_fcp_unlock_pkt(fsp); | |
1287 | } | |
1288 | ||
3a3b42bf RL |
1289 | /** |
1290 | * fc_fcp_rec() - Send a REC ELS request | |
1291 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1292 | */ |
1293 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1294 | { | |
3a3b42bf | 1295 | struct fc_lport *lport; |
42e9a92f RL |
1296 | struct fc_frame *fp; |
1297 | struct fc_rport *rport; | |
3a3b42bf | 1298 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1299 | |
3a3b42bf | 1300 | lport = fsp->lp; |
42e9a92f | 1301 | rport = fsp->rport; |
3a3b42bf RL |
1302 | rpriv = rport->dd_data; |
1303 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1304 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1305 | fsp->io_status = 0; |
42e9a92f RL |
1306 | fc_fcp_complete_locked(fsp); |
1307 | return; | |
1308 | } | |
3a3b42bf | 1309 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1310 | if (!fp) |
1311 | goto retry; | |
1312 | ||
1313 | fr_seq(fp) = fsp->seq_ptr; | |
1314 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
3a3b42bf | 1315 | fc_host_port_id(rpriv->local_port->host), FC_TYPE_ELS, |
42e9a92f | 1316 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
3a3b42bf RL |
1317 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1318 | fc_fcp_rec_resp, fsp, | |
1319 | jiffies_to_msecs(FC_SCSI_REC_TOV))) { | |
42e9a92f RL |
1320 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1321 | return; | |
1322 | } | |
42e9a92f RL |
1323 | retry: |
1324 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1325 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1326 | else | |
1327 | fc_timeout_error(fsp); | |
1328 | } | |
1329 | ||
3a3b42bf RL |
1330 | /** |
1331 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1332 | * @seq: The sequence the response is on | |
1333 | * @fp: The response frame | |
1334 | * @arg: The FCP packet the response is on | |
1335 | * | |
1336 | * If the response is a reject then the scsi layer will handle | |
1337 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1338 | * set the timeout and return. If the I/O was completed then complete the | |
1339 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1340 | */ |
1341 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1342 | { | |
1343 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1344 | struct fc_els_rec_acc *recp; | |
1345 | struct fc_els_ls_rjt *rjt; | |
1346 | u32 e_stat; | |
1347 | u8 opcode; | |
1348 | u32 offset; | |
1349 | enum dma_data_direction data_dir; | |
1350 | enum fc_rctl r_ctl; | |
3a3b42bf | 1351 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1352 | |
1353 | if (IS_ERR(fp)) { | |
1354 | fc_fcp_rec_error(fsp, fp); | |
1355 | return; | |
1356 | } | |
1357 | ||
1358 | if (fc_fcp_lock_pkt(fsp)) | |
1359 | goto out; | |
1360 | ||
1361 | fsp->recov_retry = 0; | |
1362 | opcode = fc_frame_payload_op(fp); | |
1363 | if (opcode == ELS_LS_RJT) { | |
1364 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1365 | switch (rjt->er_reason) { | |
1366 | default: | |
7414705e RL |
1367 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1368 | "reason %d expl %d\n", | |
1369 | fsp->rport->port_id, rjt->er_reason, | |
1370 | rjt->er_explan); | |
42e9a92f RL |
1371 | /* fall through */ |
1372 | case ELS_RJT_UNSUP: | |
7414705e | 1373 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1374 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1375 | /* |
1376 | * if we do not spport RECs or got some bogus | |
1377 | * reason then resetup timer so we check for | |
1378 | * making progress. | |
1379 | */ | |
3a3b42bf | 1380 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1381 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); |
1382 | break; | |
1383 | case ELS_RJT_LOGIC: | |
1384 | case ELS_RJT_UNAB: | |
1385 | /* | |
1386 | * If no data transfer, the command frame got dropped | |
1387 | * so we just retry. If data was transferred, we | |
1388 | * lost the response but the target has no record, | |
1389 | * so we abort and retry. | |
1390 | */ | |
1391 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1392 | fsp->xfer_len == 0) { | |
1393 | fc_fcp_retry_cmd(fsp); | |
1394 | break; | |
1395 | } | |
1396 | fc_timeout_error(fsp); | |
1397 | break; | |
1398 | } | |
1399 | } else if (opcode == ELS_LS_ACC) { | |
1400 | if (fsp->state & FC_SRB_ABORTED) | |
1401 | goto unlock_out; | |
1402 | ||
1403 | data_dir = fsp->cmd->sc_data_direction; | |
1404 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1405 | offset = ntohl(recp->reca_fc4value); | |
1406 | e_stat = ntohl(recp->reca_e_stat); | |
1407 | ||
1408 | if (e_stat & ESB_ST_COMPLETE) { | |
1409 | ||
1410 | /* | |
1411 | * The exchange is complete. | |
1412 | * | |
1413 | * For output, we must've lost the response. | |
1414 | * For input, all data must've been sent. | |
1415 | * We lost may have lost the response | |
1416 | * (and a confirmation was requested) and maybe | |
1417 | * some data. | |
1418 | * | |
1419 | * If all data received, send SRR | |
1420 | * asking for response. If partial data received, | |
1421 | * or gaps, SRR requests data at start of gap. | |
1422 | * Recovery via SRR relies on in-order-delivery. | |
1423 | */ | |
1424 | if (data_dir == DMA_TO_DEVICE) { | |
1425 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1426 | } else if (fsp->xfer_contig_end == offset) { | |
1427 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1428 | } else { | |
1429 | offset = fsp->xfer_contig_end; | |
1430 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1431 | } | |
1432 | fc_fcp_srr(fsp, r_ctl, offset); | |
1433 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
1434 | ||
1435 | /* | |
1436 | * The remote port has the initiative, so just | |
1437 | * keep waiting for it to complete. | |
1438 | */ | |
1439 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1440 | } else { | |
1441 | ||
1442 | /* | |
1443 | * The exchange is incomplete, we have seq. initiative. | |
1444 | * Lost response with requested confirmation, | |
1445 | * lost confirmation, lost transfer ready or | |
1446 | * lost write data. | |
1447 | * | |
1448 | * For output, if not all data was received, ask | |
1449 | * for transfer ready to be repeated. | |
1450 | * | |
1451 | * If we received or sent all the data, send SRR to | |
1452 | * request response. | |
1453 | * | |
1454 | * If we lost a response, we may have lost some read | |
1455 | * data as well. | |
1456 | */ | |
1457 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1458 | if (data_dir == DMA_TO_DEVICE) { | |
1459 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1460 | if (offset < fsp->data_len) | |
1461 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1462 | } else if (offset == fsp->xfer_contig_end) { | |
1463 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1464 | } else if (fsp->xfer_contig_end < offset) { | |
1465 | offset = fsp->xfer_contig_end; | |
1466 | } | |
1467 | fc_fcp_srr(fsp, r_ctl, offset); | |
1468 | } | |
1469 | } | |
1470 | unlock_out: | |
1471 | fc_fcp_unlock_pkt(fsp); | |
1472 | out: | |
1473 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1474 | fc_frame_free(fp); | |
1475 | } | |
1476 | ||
3a3b42bf RL |
1477 | /** |
1478 | * fc_fcp_rec_error() - Handler for REC errors | |
1479 | * @fsp: The FCP packet the error is on | |
1480 | * @fp: The REC frame | |
42e9a92f RL |
1481 | */ |
1482 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1483 | { | |
1484 | int error = PTR_ERR(fp); | |
1485 | ||
1486 | if (fc_fcp_lock_pkt(fsp)) | |
1487 | goto out; | |
1488 | ||
1489 | switch (error) { | |
1490 | case -FC_EX_CLOSED: | |
1491 | fc_fcp_retry_cmd(fsp); | |
1492 | break; | |
1493 | ||
1494 | default: | |
7414705e RL |
1495 | FC_FCP_DBG(fsp, "REC %p fid %x error unexpected error %d\n", |
1496 | fsp, fsp->rport->port_id, error); | |
42e9a92f RL |
1497 | fsp->status_code = FC_CMD_PLOGO; |
1498 | /* fall through */ | |
1499 | ||
1500 | case -FC_EX_TIMEOUT: | |
1501 | /* | |
1502 | * Assume REC or LS_ACC was lost. | |
1503 | * The exchange manager will have aborted REC, so retry. | |
1504 | */ | |
7414705e RL |
1505 | FC_FCP_DBG(fsp, "REC fid %x error error %d retry %d/%d\n", |
1506 | fsp->rport->port_id, error, fsp->recov_retry, | |
1507 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1508 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1509 | fc_fcp_rec(fsp); | |
1510 | else | |
1511 | fc_timeout_error(fsp); | |
1512 | break; | |
1513 | } | |
1514 | fc_fcp_unlock_pkt(fsp); | |
1515 | out: | |
1516 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1517 | } | |
1518 | ||
3a3b42bf RL |
1519 | /** |
1520 | * fc_timeout_error() - Handler for fcp_pkt timeouts | |
1521 | * @fsp: The FCP packt that has timed out | |
42e9a92f RL |
1522 | */ |
1523 | static void fc_timeout_error(struct fc_fcp_pkt *fsp) | |
1524 | { | |
1525 | fsp->status_code = FC_CMD_TIME_OUT; | |
1526 | fsp->cdb_status = 0; | |
1527 | fsp->io_status = 0; | |
1528 | /* | |
1529 | * if this fails then we let the scsi command timer fire and | |
1530 | * scsi-ml escalate. | |
1531 | */ | |
1532 | fc_fcp_send_abort(fsp); | |
1533 | } | |
1534 | ||
3a3b42bf RL |
1535 | /** |
1536 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1537 | * @fsp: The FCP packet the SRR is to be sent on | |
1538 | * @r_ctl: The R_CTL field for the SRR request | |
42e9a92f RL |
1539 | * This is called after receiving status but insufficient data, or |
1540 | * when expecting status but the request has timed out. | |
1541 | */ | |
1542 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1543 | { | |
3a3b42bf | 1544 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1545 | struct fc_rport *rport; |
3a3b42bf | 1546 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1547 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1548 | struct fc_seq *seq; | |
1549 | struct fcp_srr *srr; | |
1550 | struct fc_frame *fp; | |
1551 | u8 cdb_op; | |
1552 | ||
1553 | rport = fsp->rport; | |
3a3b42bf | 1554 | rpriv = rport->dd_data; |
42e9a92f RL |
1555 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; |
1556 | ||
3a3b42bf RL |
1557 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1558 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1559 | goto retry; /* shouldn't happen */ |
3a3b42bf | 1560 | fp = fc_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1561 | if (!fp) |
1562 | goto retry; | |
1563 | ||
1564 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1565 | memset(srr, 0, sizeof(*srr)); | |
1566 | srr->srr_op = ELS_SRR; | |
1567 | srr->srr_ox_id = htons(ep->oxid); | |
1568 | srr->srr_rx_id = htons(ep->rxid); | |
1569 | srr->srr_r_ctl = r_ctl; | |
1570 | srr->srr_rel_off = htonl(offset); | |
1571 | ||
1572 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
3a3b42bf | 1573 | fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, |
42e9a92f RL |
1574 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
1575 | ||
3a3b42bf RL |
1576 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, |
1577 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); | |
8f550f93 | 1578 | if (!seq) |
42e9a92f | 1579 | goto retry; |
8f550f93 | 1580 | |
42e9a92f RL |
1581 | fsp->recov_seq = seq; |
1582 | fsp->xfer_len = offset; | |
1583 | fsp->xfer_contig_end = offset; | |
1584 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1585 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1586 | return; | |
1587 | retry: | |
1588 | fc_fcp_retry_cmd(fsp); | |
1589 | } | |
1590 | ||
3a3b42bf RL |
1591 | /** |
1592 | * fc_fcp_srr_resp() - Handler for SRR response | |
1593 | * @seq: The sequence the SRR is on | |
1594 | * @fp: The SRR frame | |
1595 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1596 | */ |
1597 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1598 | { | |
1599 | struct fc_fcp_pkt *fsp = arg; | |
1600 | struct fc_frame_header *fh; | |
1601 | ||
1602 | if (IS_ERR(fp)) { | |
1603 | fc_fcp_srr_error(fsp, fp); | |
1604 | return; | |
1605 | } | |
1606 | ||
1607 | if (fc_fcp_lock_pkt(fsp)) | |
1608 | goto out; | |
1609 | ||
1610 | fh = fc_frame_header_get(fp); | |
1611 | /* | |
1612 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1613 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1614 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1615 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1616 | * an abort response though. | |
1617 | */ | |
1618 | if (fh->fh_type == FC_TYPE_BLS) { | |
1619 | fc_fcp_unlock_pkt(fsp); | |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | fsp->recov_seq = NULL; | |
1624 | switch (fc_frame_payload_op(fp)) { | |
1625 | case ELS_LS_ACC: | |
1626 | fsp->recov_retry = 0; | |
1627 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1628 | break; | |
1629 | case ELS_LS_RJT: | |
1630 | default: | |
1631 | fc_timeout_error(fsp); | |
1632 | break; | |
1633 | } | |
1634 | fc_fcp_unlock_pkt(fsp); | |
1635 | fsp->lp->tt.exch_done(seq); | |
1636 | out: | |
1637 | fc_frame_free(fp); | |
1638 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1639 | } | |
1640 | ||
3a3b42bf RL |
1641 | /** |
1642 | * fc_fcp_srr_error() - Handler for SRR errors | |
1643 | * @fsp: The FCP packet that the SRR error is on | |
1644 | * @fp: The SRR frame | |
1645 | */ | |
42e9a92f RL |
1646 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1647 | { | |
1648 | if (fc_fcp_lock_pkt(fsp)) | |
1649 | goto out; | |
1650 | fsp->lp->tt.exch_done(fsp->recov_seq); | |
1651 | fsp->recov_seq = NULL; | |
1652 | switch (PTR_ERR(fp)) { | |
1653 | case -FC_EX_TIMEOUT: | |
1654 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1655 | fc_fcp_rec(fsp); | |
1656 | else | |
1657 | fc_timeout_error(fsp); | |
1658 | break; | |
1659 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1660 | /* fall through */ | |
1661 | default: | |
1662 | fc_fcp_retry_cmd(fsp); | |
1663 | break; | |
1664 | } | |
1665 | fc_fcp_unlock_pkt(fsp); | |
1666 | out: | |
1667 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1668 | } | |
1669 | ||
3a3b42bf RL |
1670 | /** |
1671 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1672 | * @lport: The local port to be checked | |
1673 | */ | |
1674 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1675 | { |
1676 | /* lock ? */ | |
3a3b42bf RL |
1677 | return (lport->state == LPORT_ST_READY) && |
1678 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1679 | } |
1680 | ||
1681 | /** | |
3a3b42bf RL |
1682 | * fc_queuecommand() - The queuecommand function of the SCSI template |
1683 | * @cmd: The scsi_cmnd to be executed | |
1684 | * @done: The callback function to be called when the scsi_cmnd is complete | |
42e9a92f | 1685 | * |
3a3b42bf RL |
1686 | * This is the i/o strategy routine, called by the SCSI layer. This routine |
1687 | * is called with the host_lock held. | |
42e9a92f RL |
1688 | */ |
1689 | int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) | |
1690 | { | |
3a3b42bf | 1691 | struct fc_lport *lport; |
42e9a92f RL |
1692 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1693 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1694 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1695 | int rval; |
1696 | int rc = 0; | |
1697 | struct fcoe_dev_stats *stats; | |
1698 | ||
3a3b42bf | 1699 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f RL |
1700 | |
1701 | rval = fc_remote_port_chkready(rport); | |
1702 | if (rval) { | |
1703 | sc_cmd->result = rval; | |
1704 | done(sc_cmd); | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1708 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1709 | /* | |
1710 | * rport is transitioning from blocked/deleted to | |
1711 | * online | |
1712 | */ | |
1713 | sc_cmd->result = DID_IMM_RETRY << 16; | |
1714 | done(sc_cmd); | |
1715 | goto out; | |
1716 | } | |
1717 | ||
3a3b42bf | 1718 | rpriv = rport->dd_data; |
42e9a92f | 1719 | |
3a3b42bf | 1720 | if (!fc_fcp_lport_queue_ready(lport)) { |
42e9a92f RL |
1721 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1722 | goto out; | |
1723 | } | |
1724 | ||
3a3b42bf | 1725 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1726 | if (fsp == NULL) { |
1727 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1728 | goto out; | |
1729 | } | |
1730 | ||
1731 | /* | |
1732 | * build the libfc request pkt | |
1733 | */ | |
1734 | fsp->cmd = sc_cmd; /* save the cmd */ | |
3a3b42bf | 1735 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f | 1736 | fsp->rport = rport; /* set the remote port ptr */ |
5e472d07 | 1737 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
1738 | sc_cmd->scsi_done = done; |
1739 | ||
1740 | /* | |
1741 | * set up the transfer length | |
1742 | */ | |
1743 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1744 | fsp->xfer_len = 0; | |
1745 | ||
1746 | /* | |
1747 | * setup the data direction | |
1748 | */ | |
3a3b42bf | 1749 | stats = fc_lport_get_stats(lport); |
42e9a92f RL |
1750 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1751 | fsp->req_flags = FC_SRB_READ; | |
1752 | stats->InputRequests++; | |
1753 | stats->InputMegabytes = fsp->data_len; | |
1754 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { | |
1755 | fsp->req_flags = FC_SRB_WRITE; | |
1756 | stats->OutputRequests++; | |
1757 | stats->OutputMegabytes = fsp->data_len; | |
1758 | } else { | |
1759 | fsp->req_flags = 0; | |
1760 | stats->ControlRequests++; | |
1761 | } | |
1762 | ||
3a3b42bf | 1763 | fsp->tgt_flags = rpriv->flags; |
42e9a92f RL |
1764 | |
1765 | init_timer(&fsp->timer); | |
1766 | fsp->timer.data = (unsigned long)fsp; | |
1767 | ||
1768 | /* | |
1769 | * send it to the lower layer | |
1770 | * if we get -1 return then put the request in the pending | |
1771 | * queue. | |
1772 | */ | |
3a3b42bf | 1773 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1774 | if (rval != 0) { |
1775 | fsp->state = FC_SRB_FREE; | |
1776 | fc_fcp_pkt_release(fsp); | |
1777 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1778 | } | |
1779 | out: | |
1780 | return rc; | |
1781 | } | |
1782 | EXPORT_SYMBOL(fc_queuecommand); | |
1783 | ||
1784 | /** | |
3a3b42bf RL |
1785 | * fc_io_compl() - Handle responses for completed commands |
1786 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1787 | * |
3a3b42bf | 1788 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1789 | * The fcp packet lock must be held when calling. |
1790 | */ | |
1791 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1792 | { | |
1793 | struct fc_fcp_internal *si; | |
1794 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1795 | struct fc_lport *lport; |
42e9a92f RL |
1796 | unsigned long flags; |
1797 | ||
b277d2aa YZ |
1798 | /* release outstanding ddp context */ |
1799 | fc_fcp_ddp_done(fsp); | |
1800 | ||
42e9a92f RL |
1801 | fsp->state |= FC_SRB_COMPL; |
1802 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1803 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1804 | del_timer_sync(&fsp->timer); | |
1805 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1806 | } | |
1807 | ||
3a3b42bf RL |
1808 | lport = fsp->lp; |
1809 | si = fc_get_scsi_internal(lport); | |
1810 | spin_lock_irqsave(lport->host->host_lock, flags); | |
42e9a92f | 1811 | if (!fsp->cmd) { |
3a3b42bf | 1812 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
1813 | return; |
1814 | } | |
1815 | ||
1816 | /* | |
1817 | * if a command timed out while we had to try and throttle IO | |
1818 | * and it is now getting cleaned up, then we are about to | |
1819 | * try again so clear the throttled flag incase we get more | |
1820 | * time outs. | |
1821 | */ | |
1822 | if (si->throttled && fsp->state & FC_SRB_NOMEM) | |
1823 | si->throttled = 0; | |
1824 | ||
1825 | sc_cmd = fsp->cmd; | |
1826 | fsp->cmd = NULL; | |
1827 | ||
1828 | if (!sc_cmd->SCp.ptr) { | |
3a3b42bf | 1829 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
1830 | return; |
1831 | } | |
1832 | ||
1833 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; | |
1834 | switch (fsp->status_code) { | |
1835 | case FC_COMPLETE: | |
1836 | if (fsp->cdb_status == 0) { | |
1837 | /* | |
1838 | * good I/O status | |
1839 | */ | |
1840 | sc_cmd->result = DID_OK << 16; | |
1841 | if (fsp->scsi_resid) | |
1842 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1843 | } else { |
1844 | /* | |
1845 | * transport level I/O was ok but scsi | |
1846 | * has non zero status | |
1847 | */ | |
1848 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1849 | } | |
1850 | break; | |
1851 | case FC_ERROR: | |
1852 | sc_cmd->result = DID_ERROR << 16; | |
1853 | break; | |
1854 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1855 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1856 | /* |
1857 | * scsi status is good but transport level | |
26d9cab5 | 1858 | * underrun. |
42e9a92f | 1859 | */ |
4347fa66 YZ |
1860 | sc_cmd->result = (fsp->state & FC_SRB_RCV_STATUS ? |
1861 | DID_OK : DID_ERROR) << 16; | |
42e9a92f RL |
1862 | } else { |
1863 | /* | |
1864 | * scsi got underrun, this is an error | |
1865 | */ | |
1866 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
1867 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1868 | } | |
1869 | break; | |
1870 | case FC_DATA_OVRRUN: | |
1871 | /* | |
1872 | * overrun is an error | |
1873 | */ | |
1874 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1875 | break; | |
1876 | case FC_CMD_ABORTED: | |
d5e6054a | 1877 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f RL |
1878 | break; |
1879 | case FC_CMD_TIME_OUT: | |
1880 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
1881 | break; | |
1882 | case FC_CMD_RESET: | |
1883 | sc_cmd->result = (DID_RESET << 16); | |
1884 | break; | |
1885 | case FC_HRD_ERROR: | |
1886 | sc_cmd->result = (DID_NO_CONNECT << 16); | |
1887 | break; | |
1888 | default: | |
1889 | sc_cmd->result = (DID_ERROR << 16); | |
1890 | break; | |
1891 | } | |
1892 | ||
1893 | list_del(&fsp->list); | |
1894 | sc_cmd->SCp.ptr = NULL; | |
1895 | sc_cmd->scsi_done(sc_cmd); | |
3a3b42bf | 1896 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
1897 | |
1898 | /* release ref from initial allocation in queue command */ | |
1899 | fc_fcp_pkt_release(fsp); | |
1900 | } | |
1901 | ||
42e9a92f | 1902 | /** |
34f42a07 | 1903 | * fc_eh_abort() - Abort a command |
3a3b42bf | 1904 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 1905 | * |
3a3b42bf RL |
1906 | * From SCSI host template. |
1907 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
1908 | */ |
1909 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
1910 | { | |
1911 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1912 | struct fc_lport *lport; |
42e9a92f RL |
1913 | int rc = FAILED; |
1914 | unsigned long flags; | |
1915 | ||
3a3b42bf RL |
1916 | lport = shost_priv(sc_cmd->device->host); |
1917 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 1918 | return rc; |
3a3b42bf | 1919 | else if (!lport->link_up) |
42e9a92f RL |
1920 | return rc; |
1921 | ||
3a3b42bf | 1922 | spin_lock_irqsave(lport->host->host_lock, flags); |
42e9a92f RL |
1923 | fsp = CMD_SP(sc_cmd); |
1924 | if (!fsp) { | |
1925 | /* command completed while scsi eh was setting up */ | |
3a3b42bf | 1926 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
1927 | return SUCCESS; |
1928 | } | |
1929 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
1930 | fc_fcp_pkt_hold(fsp); | |
3a3b42bf | 1931 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
1932 | |
1933 | if (fc_fcp_lock_pkt(fsp)) { | |
1934 | /* completed while we were waiting for timer to be deleted */ | |
1935 | rc = SUCCESS; | |
1936 | goto release_pkt; | |
1937 | } | |
1938 | ||
c340111d | 1939 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
1940 | fc_fcp_unlock_pkt(fsp); |
1941 | ||
1942 | release_pkt: | |
1943 | fc_fcp_pkt_release(fsp); | |
1944 | return rc; | |
1945 | } | |
1946 | EXPORT_SYMBOL(fc_eh_abort); | |
1947 | ||
1948 | /** | |
3a3b42bf RL |
1949 | * fc_eh_device_reset() - Reset a single LUN |
1950 | * @sc_cmd: The SCSI command which identifies the device whose | |
1951 | * LUN is to be reset | |
42e9a92f | 1952 | * |
3a3b42bf | 1953 | * Set from SCSI host template. |
42e9a92f RL |
1954 | */ |
1955 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
1956 | { | |
3a3b42bf | 1957 | struct fc_lport *lport; |
42e9a92f RL |
1958 | struct fc_fcp_pkt *fsp; |
1959 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
1960 | int rc = FAILED; | |
42e9a92f RL |
1961 | int rval; |
1962 | ||
1963 | rval = fc_remote_port_chkready(rport); | |
1964 | if (rval) | |
1965 | goto out; | |
1966 | ||
3a3b42bf | 1967 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 1968 | |
3a3b42bf | 1969 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
1970 | return rc; |
1971 | ||
3a3b42bf | 1972 | FC_SCSI_DBG(lport, "Resetting rport (%6x)\n", rport->port_id); |
7414705e | 1973 | |
3a3b42bf | 1974 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 1975 | if (fsp == NULL) { |
7414705e | 1976 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
1977 | sc_cmd->result = DID_NO_CONNECT << 16; |
1978 | goto out; | |
1979 | } | |
1980 | ||
1981 | /* | |
1982 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
1983 | * the sc passed in is not setup for execution like when sent | |
1984 | * through the queuecommand callout. | |
1985 | */ | |
3a3b42bf | 1986 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f RL |
1987 | fsp->rport = rport; /* set the remote port ptr */ |
1988 | ||
1989 | /* | |
1990 | * flush outstanding commands | |
1991 | */ | |
3a3b42bf | 1992 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
1993 | fsp->state = FC_SRB_FREE; |
1994 | fc_fcp_pkt_release(fsp); | |
1995 | ||
1996 | out: | |
1997 | return rc; | |
1998 | } | |
1999 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2000 | ||
2001 | /** | |
3a3b42bf RL |
2002 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2003 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2004 | */ |
2005 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2006 | { | |
2007 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2008 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2009 | unsigned long wait_tmo; |
2010 | ||
3a3b42bf | 2011 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2012 | |
3a3b42bf | 2013 | lport->tt.lport_reset(lport); |
42e9a92f | 2014 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2015 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2016 | wait_tmo)) | |
42e9a92f RL |
2017 | msleep(1000); |
2018 | ||
3a3b42bf | 2019 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2020 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
3a3b42bf | 2021 | "on port (%6x)\n", fc_host_port_id(lport->host)); |
42e9a92f RL |
2022 | return SUCCESS; |
2023 | } else { | |
7414705e RL |
2024 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
2025 | "port (%6x) is not ready.\n", | |
3a3b42bf | 2026 | fc_host_port_id(lport->host)); |
42e9a92f RL |
2027 | return FAILED; |
2028 | } | |
2029 | } | |
2030 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2031 | ||
2032 | /** | |
3a3b42bf RL |
2033 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2034 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2035 | * |
2036 | * Configures queue depth based on host's cmd_per_len. If not set | |
2037 | * then we use the libfc default. | |
2038 | */ | |
2039 | int fc_slave_alloc(struct scsi_device *sdev) | |
2040 | { | |
2041 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2042 | |
2043 | if (!rport || fc_remote_port_chkready(rport)) | |
2044 | return -ENXIO; | |
2045 | ||
14caf44c VD |
2046 | if (sdev->tagged_supported) |
2047 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2048 | else | |
2049 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2050 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2051 | ||
42e9a92f RL |
2052 | return 0; |
2053 | } | |
2054 | EXPORT_SYMBOL(fc_slave_alloc); | |
2055 | ||
3a3b42bf RL |
2056 | /** |
2057 | * fc_change_queue_depth() - Change a device's queue depth | |
2058 | * @sdev: The SCSI device whose queue depth is to change | |
2059 | * @qdepth: The new queue depth | |
2060 | * @reason: The resason for the change | |
2061 | */ | |
e881a172 | 2062 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2063 | { |
5c20848a MC |
2064 | switch (reason) { |
2065 | case SCSI_QDEPTH_DEFAULT: | |
2066 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2067 | break; | |
2068 | case SCSI_QDEPTH_QFULL: | |
2069 | scsi_track_queue_full(sdev, qdepth); | |
2070 | break; | |
229b8d72 VD |
2071 | case SCSI_QDEPTH_RAMP_UP: |
2072 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2073 | break; | |
5c20848a | 2074 | default: |
e881a172 | 2075 | return -EOPNOTSUPP; |
5c20848a | 2076 | } |
42e9a92f RL |
2077 | return sdev->queue_depth; |
2078 | } | |
2079 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2080 | ||
3a3b42bf RL |
2081 | /** |
2082 | * fc_change_queue_type() - Change a device's queue type | |
2083 | * @sdev: The SCSI device whose queue depth is to change | |
2084 | * @tag_type: Identifier for queue type | |
2085 | */ | |
42e9a92f RL |
2086 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
2087 | { | |
2088 | if (sdev->tagged_supported) { | |
2089 | scsi_set_tag_type(sdev, tag_type); | |
2090 | if (tag_type) | |
2091 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2092 | else | |
2093 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2094 | } else | |
2095 | tag_type = 0; | |
2096 | ||
2097 | return tag_type; | |
2098 | } | |
2099 | EXPORT_SYMBOL(fc_change_queue_type); | |
2100 | ||
3a3b42bf RL |
2101 | /** |
2102 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2103 | * @lport: The local port that no longer needs the FCP layer | |
2104 | */ | |
2105 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2106 | { |
3a3b42bf | 2107 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2108 | |
2109 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2110 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
3a3b42bf | 2111 | "port (%6x)\n", fc_host_port_id(lport->host)); |
42e9a92f RL |
2112 | |
2113 | mempool_destroy(si->scsi_pkt_pool); | |
2114 | kfree(si); | |
3a3b42bf | 2115 | lport->scsi_priv = NULL; |
42e9a92f RL |
2116 | } |
2117 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2118 | ||
93e6d5ab RL |
2119 | int fc_setup_fcp() |
2120 | { | |
2121 | int rc = 0; | |
2122 | ||
2123 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2124 | sizeof(struct fc_fcp_pkt), | |
2125 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2126 | if (!scsi_pkt_cachep) { | |
2127 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2128 | "module load failed!"); | |
2129 | rc = -ENOMEM; | |
2130 | } | |
2131 | ||
2132 | return rc; | |
2133 | } | |
2134 | ||
2135 | void fc_destroy_fcp() | |
2136 | { | |
2137 | if (scsi_pkt_cachep) | |
2138 | kmem_cache_destroy(scsi_pkt_cachep); | |
2139 | } | |
2140 | ||
3a3b42bf RL |
2141 | /** |
2142 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2143 | * @lport: The local port to initialize the exchange layer for | |
2144 | */ | |
2145 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2146 | { |
2147 | int rc; | |
2148 | struct fc_fcp_internal *si; | |
2149 | ||
3a3b42bf RL |
2150 | if (!lport->tt.fcp_cmd_send) |
2151 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2152 | |
3a3b42bf RL |
2153 | if (!lport->tt.fcp_cleanup) |
2154 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2155 | |
3a3b42bf RL |
2156 | if (!lport->tt.fcp_abort_io) |
2157 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2158 | |
2159 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2160 | if (!si) | |
2161 | return -ENOMEM; | |
3a3b42bf | 2162 | lport->scsi_priv = si; |
42e9a92f RL |
2163 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
2164 | ||
2165 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2166 | if (!si->scsi_pkt_pool) { | |
2167 | rc = -ENOMEM; | |
2168 | goto free_internal; | |
2169 | } | |
2170 | return 0; | |
2171 | ||
2172 | free_internal: | |
2173 | kfree(si); | |
2174 | return rc; | |
2175 | } | |
2176 | EXPORT_SYMBOL(fc_fcp_init); |