Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
42e9a92f RL |
31 | |
32 | #include <scsi/scsi_tcq.h> | |
33 | #include <scsi/scsi.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi_device.h> | |
36 | #include <scsi/scsi_cmnd.h> | |
37 | ||
38 | #include <scsi/fc/fc_fc2.h> | |
39 | ||
40 | #include <scsi/libfc.h> | |
41 | #include <scsi/fc_encode.h> | |
42 | ||
8866a5d9 | 43 | #include "fc_libfc.h" |
42e9a92f | 44 | |
93e6d5ab | 45 | struct kmem_cache *scsi_pkt_cachep; |
42e9a92f RL |
46 | |
47 | /* SRB state definitions */ | |
48 | #define FC_SRB_FREE 0 /* cmd is free */ | |
49 | #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ | |
50 | #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ | |
51 | #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ | |
3ad2f3fb | 52 | #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ |
42e9a92f RL |
53 | #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ |
54 | #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ | |
55 | #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ | |
42e9a92f RL |
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 | |
c1ecb90a CL |
72 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
73 | * @scsi_queue_lock: Protects the scsi_pkt_queue | |
3a3b42bf | 74 | * @scsi_pkt_queue: Current FCP packets |
84c3e1ad VD |
75 | * @last_can_queue_ramp_down_time: ramp down time |
76 | * @last_can_queue_ramp_up_time: ramp up time | |
77 | * @max_can_queue: max can_queue size | |
3a3b42bf | 78 | */ |
42e9a92f | 79 | struct fc_fcp_internal { |
c1ecb90a CL |
80 | mempool_t *scsi_pkt_pool; |
81 | spinlock_t scsi_queue_lock; | |
82 | struct list_head scsi_pkt_queue; | |
83 | unsigned long last_can_queue_ramp_down_time; | |
84 | unsigned long last_can_queue_ramp_up_time; | |
85 | int max_can_queue; | |
42e9a92f RL |
86 | }; |
87 | ||
88 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
89 | ||
90 | /* | |
91 | * function prototypes | |
92 | * FC scsi I/O related functions | |
93 | */ | |
94 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
95 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
96 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
97 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
98 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 99 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
5c12c418 | 100 | static void fc_fcp_recovery(struct fc_fcp_pkt *); |
3a3b42bf | 101 | static void fc_fcp_timeout(unsigned long); |
42e9a92f RL |
102 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
103 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
104 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
105 | static void fc_io_compl(struct fc_fcp_pkt *); | |
106 | ||
107 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
108 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
109 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
110 | ||
111 | /* | |
112 | * command status codes | |
113 | */ | |
114 | #define FC_COMPLETE 0 | |
115 | #define FC_CMD_ABORTED 1 | |
116 | #define FC_CMD_RESET 2 | |
117 | #define FC_CMD_PLOGO 3 | |
118 | #define FC_SNS_RCV 4 | |
119 | #define FC_TRANS_ERR 5 | |
120 | #define FC_DATA_OVRRUN 6 | |
121 | #define FC_DATA_UNDRUN 7 | |
122 | #define FC_ERROR 8 | |
123 | #define FC_HRD_ERROR 9 | |
5c12c418 | 124 | #define FC_CMD_RECOVERY 10 |
42e9a92f RL |
125 | |
126 | /* | |
127 | * Error recovery timeout values. | |
128 | */ | |
129 | #define FC_SCSI_ER_TIMEOUT (10 * HZ) | |
130 | #define FC_SCSI_TM_TOV (10 * HZ) | |
131 | #define FC_SCSI_REC_TOV (2 * HZ) | |
132 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) | |
84c3e1ad | 133 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
42e9a92f RL |
134 | |
135 | #define FC_MAX_ERROR_CNT 5 | |
136 | #define FC_MAX_RECOV_RETRY 3 | |
137 | ||
138 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
139 | ||
140 | /** | |
3a3b42bf RL |
141 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
142 | * @lport: The local port that the FCP packet is for | |
143 | * @gfp: GFP flags for allocation | |
42e9a92f | 144 | * |
3a3b42bf RL |
145 | * Return value: fcp_pkt structure or null on allocation failure. |
146 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 147 | */ |
3a3b42bf | 148 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 149 | { |
3a3b42bf | 150 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
151 | struct fc_fcp_pkt *fsp; |
152 | ||
153 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
154 | if (fsp) { | |
155 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 156 | fsp->lp = lport; |
42e9a92f RL |
157 | atomic_set(&fsp->ref_cnt, 1); |
158 | init_timer(&fsp->timer); | |
159 | INIT_LIST_HEAD(&fsp->list); | |
160 | spin_lock_init(&fsp->scsi_pkt_lock); | |
161 | } | |
162 | return fsp; | |
163 | } | |
164 | ||
165 | /** | |
3a3b42bf RL |
166 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
167 | * @fsp: The FCP packet to be released | |
42e9a92f | 168 | * |
3a3b42bf RL |
169 | * Context: Can be called from process or interrupt context, |
170 | * no lock is required. | |
42e9a92f RL |
171 | */ |
172 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
173 | { | |
174 | if (atomic_dec_and_test(&fsp->ref_cnt)) { | |
175 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); | |
176 | ||
177 | mempool_free(fsp, si->scsi_pkt_pool); | |
178 | } | |
179 | } | |
180 | ||
3a3b42bf RL |
181 | /** |
182 | * fc_fcp_pkt_hold() - Hold a fcp_pkt | |
183 | * @fsp: The FCP packet to be held | |
184 | */ | |
42e9a92f RL |
185 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
186 | { | |
187 | atomic_inc(&fsp->ref_cnt); | |
188 | } | |
189 | ||
190 | /** | |
3a3b42bf RL |
191 | * fc_fcp_pkt_destory() - Release hold on a fcp_pkt |
192 | * @seq: The sequence that the FCP packet is on (required by destructor API) | |
193 | * @fsp: The FCP packet to be released | |
194 | * | |
195 | * This routine is called by a destructor callback in the exch_seq_send() | |
196 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required | |
197 | * argument even though it is not used by this routine. | |
42e9a92f | 198 | * |
3a3b42bf | 199 | * Context: No locking required. |
42e9a92f RL |
200 | */ |
201 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
202 | { | |
203 | fc_fcp_pkt_release(fsp); | |
204 | } | |
205 | ||
206 | /** | |
3a3b42bf RL |
207 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
208 | * @fsp: The FCP packet to be locked and incremented | |
42e9a92f | 209 | * |
3a3b42bf | 210 | * We should only return error if we return a command to SCSI-ml before |
42e9a92f RL |
211 | * getting a response. This can happen in cases where we send a abort, but |
212 | * do not wait for the response and the abort and command can be passing | |
213 | * each other on the wire/network-layer. | |
214 | * | |
215 | * Note: this function locks the packet and gets a reference to allow | |
216 | * callers to call the completion function while the lock is held and | |
217 | * not have to worry about the packets refcount. | |
218 | * | |
219 | * TODO: Maybe we should just have callers grab/release the lock and | |
220 | * have a function that they call to verify the fsp and grab a ref if | |
221 | * needed. | |
222 | */ | |
223 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
224 | { | |
225 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
226 | if (fsp->state & FC_SRB_COMPL) { | |
227 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
228 | return -EPERM; | |
229 | } | |
230 | ||
231 | fc_fcp_pkt_hold(fsp); | |
232 | return 0; | |
233 | } | |
234 | ||
3a3b42bf RL |
235 | /** |
236 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its | |
237 | * reference count | |
238 | * @fsp: The FCP packet to be unlocked and decremented | |
239 | */ | |
42e9a92f RL |
240 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
241 | { | |
242 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
243 | fc_fcp_pkt_release(fsp); | |
244 | } | |
245 | ||
3a3b42bf RL |
246 | /** |
247 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt | |
248 | * @fsp: The FCP packet to start a timer for | |
249 | * @delay: The timeout period for the timer | |
250 | */ | |
42e9a92f RL |
251 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
252 | { | |
253 | if (!(fsp->state & FC_SRB_COMPL)) | |
254 | mod_timer(&fsp->timer, jiffies + delay); | |
255 | } | |
256 | ||
3a3b42bf RL |
257 | /** |
258 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a | |
259 | * fcp_pkt | |
260 | * @fsp: The FCP packet to abort exchanges on | |
261 | */ | |
42e9a92f RL |
262 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
263 | { | |
264 | if (!fsp->seq_ptr) | |
265 | return -EINVAL; | |
266 | ||
267 | fsp->state |= FC_SRB_ABORT_PENDING; | |
268 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); | |
269 | } | |
270 | ||
3a3b42bf RL |
271 | /** |
272 | * fc_fcp_retry_cmd() - Retry a fcp_pkt | |
273 | * @fsp: The FCP packet to be retried | |
274 | * | |
275 | * Sets the status code to be FC_ERROR and then calls | |
276 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). | |
277 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. | |
278 | * The SCSI-ml will retry the command. | |
42e9a92f RL |
279 | */ |
280 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) | |
281 | { | |
282 | if (fsp->seq_ptr) { | |
283 | fsp->lp->tt.exch_done(fsp->seq_ptr); | |
284 | fsp->seq_ptr = NULL; | |
285 | } | |
286 | ||
287 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 288 | fsp->io_status = 0; |
42e9a92f RL |
289 | fsp->status_code = FC_ERROR; |
290 | fc_fcp_complete_locked(fsp); | |
291 | } | |
292 | ||
3a3b42bf RL |
293 | /** |
294 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context | |
295 | * @fsp: The FCP packet that will manage the DDP frames | |
296 | * @xid: The XID that will be used for the DDP exchange | |
b277d2aa YZ |
297 | */ |
298 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
299 | { | |
3a3b42bf | 300 | struct fc_lport *lport; |
b277d2aa | 301 | |
3a3b42bf | 302 | lport = fsp->lp; |
b277d2aa | 303 | if ((fsp->req_flags & FC_SRB_READ) && |
3a3b42bf RL |
304 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
305 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), | |
306 | scsi_sg_count(fsp->cmd))) | |
b277d2aa YZ |
307 | fsp->xfer_ddp = xid; |
308 | } | |
309 | } | |
b277d2aa | 310 | |
3a3b42bf RL |
311 | /** |
312 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any | |
313 | * DDP related resources for a fcp_pkt | |
314 | * @fsp: The FCP packet that DDP had been used on | |
b277d2aa YZ |
315 | */ |
316 | static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) | |
317 | { | |
3a3b42bf | 318 | struct fc_lport *lport; |
b277d2aa YZ |
319 | |
320 | if (!fsp) | |
321 | return; | |
322 | ||
5e472d07 YZ |
323 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
324 | return; | |
325 | ||
3a3b42bf RL |
326 | lport = fsp->lp; |
327 | if (lport->tt.ddp_done) { | |
328 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); | |
5e472d07 | 329 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
330 | } |
331 | } | |
332 | ||
84c3e1ad VD |
333 | /** |
334 | * fc_fcp_can_queue_ramp_up() - increases can_queue | |
335 | * @lport: lport to ramp up can_queue | |
336 | * | |
337 | * Locking notes: Called with Scsi_Host lock held | |
338 | */ | |
339 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) | |
340 | { | |
341 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
342 | int can_queue; | |
343 | ||
344 | if (si->last_can_queue_ramp_up_time && | |
345 | (time_before(jiffies, si->last_can_queue_ramp_up_time + | |
346 | FC_CAN_QUEUE_PERIOD))) | |
347 | return; | |
348 | ||
349 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
350 | FC_CAN_QUEUE_PERIOD)) | |
351 | return; | |
352 | ||
353 | si->last_can_queue_ramp_up_time = jiffies; | |
354 | ||
355 | can_queue = lport->host->can_queue << 1; | |
356 | if (can_queue >= si->max_can_queue) { | |
357 | can_queue = si->max_can_queue; | |
358 | si->last_can_queue_ramp_down_time = 0; | |
359 | } | |
360 | lport->host->can_queue = can_queue; | |
361 | shost_printk(KERN_ERR, lport->host, "libfc: increased " | |
362 | "can_queue to %d.\n", can_queue); | |
363 | } | |
364 | ||
c46be11a VD |
365 | /** |
366 | * fc_fcp_can_queue_ramp_down() - reduces can_queue | |
367 | * @lport: lport to reduce can_queue | |
368 | * | |
369 | * If we are getting memory allocation failures, then we may | |
370 | * be trying to execute too many commands. We let the running | |
371 | * commands complete or timeout, then try again with a reduced | |
372 | * can_queue. Eventually we will hit the point where we run | |
373 | * on all reserved structs. | |
84c3e1ad VD |
374 | * |
375 | * Locking notes: Called with Scsi_Host lock held | |
c46be11a VD |
376 | */ |
377 | static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) | |
378 | { | |
379 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
c46be11a VD |
380 | int can_queue; |
381 | ||
84c3e1ad VD |
382 | if (si->last_can_queue_ramp_down_time && |
383 | (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
384 | FC_CAN_QUEUE_PERIOD))) | |
385 | return; | |
386 | ||
387 | si->last_can_queue_ramp_down_time = jiffies; | |
c46be11a VD |
388 | |
389 | can_queue = lport->host->can_queue; | |
390 | can_queue >>= 1; | |
391 | if (!can_queue) | |
392 | can_queue = 1; | |
393 | lport->host->can_queue = can_queue; | |
394 | shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" | |
395 | "Reducing can_queue to %d.\n", can_queue); | |
c46be11a VD |
396 | } |
397 | ||
398 | /* | |
399 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. | |
400 | * @lport: fc lport struct | |
401 | * @len: payload length | |
402 | * | |
403 | * Allocates fc_frame structure and buffer but if fails to allocate | |
404 | * then reduce can_queue. | |
405 | */ | |
406 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, | |
407 | size_t len) | |
408 | { | |
409 | struct fc_frame *fp; | |
84c3e1ad | 410 | unsigned long flags; |
c46be11a VD |
411 | |
412 | fp = fc_frame_alloc(lport, len); | |
c1ecb90a CL |
413 | if (likely(fp)) |
414 | return fp; | |
415 | ||
416 | /* error case */ | |
417 | spin_lock_irqsave(lport->host->host_lock, flags); | |
418 | fc_fcp_can_queue_ramp_down(lport); | |
419 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
420 | return NULL; | |
c46be11a VD |
421 | } |
422 | ||
3a3b42bf RL |
423 | /** |
424 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
425 | * @fsp: The FCP packet the data is on | |
426 | * @fp: The data frame | |
42e9a92f RL |
427 | */ |
428 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
429 | { | |
430 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 431 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
432 | struct fcoe_dev_stats *stats; |
433 | struct fc_frame_header *fh; | |
434 | size_t start_offset; | |
435 | size_t offset; | |
436 | u32 crc; | |
437 | u32 copy_len = 0; | |
438 | size_t len; | |
439 | void *buf; | |
440 | struct scatterlist *sg; | |
58682874 | 441 | u32 nents; |
42e9a92f RL |
442 | |
443 | fh = fc_frame_header_get(fp); | |
444 | offset = ntohl(fh->fh_parm_offset); | |
445 | start_offset = offset; | |
446 | len = fr_len(fp) - sizeof(*fh); | |
447 | buf = fc_frame_payload_get(fp, 0); | |
448 | ||
5c12c418 VD |
449 | /* |
450 | * if this I/O is ddped then clear it | |
451 | * and initiate recovery since data | |
452 | * frames are expected to be placed | |
453 | * directly in that case. | |
454 | */ | |
455 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { | |
456 | fc_fcp_ddp_done(fsp); | |
457 | goto err; | |
458 | } | |
42e9a92f | 459 | if (offset + len > fsp->data_len) { |
34f42a07 | 460 | /* this should never happen */ |
42e9a92f RL |
461 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
462 | fc_frame_crc_check(fp)) | |
463 | goto crc_err; | |
7414705e RL |
464 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
465 | "data_len %x\n", len, offset, fsp->data_len); | |
5c12c418 | 466 | goto err; |
42e9a92f RL |
467 | } |
468 | if (offset != fsp->xfer_len) | |
469 | fsp->state |= FC_SRB_DISCONTIG; | |
470 | ||
42e9a92f | 471 | sg = scsi_sglist(sc); |
58682874 | 472 | nents = scsi_sg_count(sc); |
42e9a92f | 473 | |
58682874 RL |
474 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
475 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
476 | &offset, KM_SOFTIRQ0, NULL); | |
477 | } else { | |
478 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
479 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
480 | &offset, KM_SOFTIRQ0, &crc); | |
42e9a92f | 481 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 482 | if (len % 4) |
42e9a92f | 483 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
484 | |
485 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
486 | crc_err: | |
f018b73a | 487 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f | 488 | stats->ErrorFrames++; |
f018b73a | 489 | /* per cpu count, not total count, but OK for limit */ |
42e9a92f | 490 | if (stats->InvalidCRCCount++ < 5) |
7414705e | 491 | printk(KERN_WARNING "libfc: CRC error on data " |
ce8b5df0 | 492 | "frame for port (%6.6x)\n", |
3a3b42bf | 493 | fc_host_port_id(lport->host)); |
f018b73a | 494 | put_cpu(); |
42e9a92f RL |
495 | /* |
496 | * Assume the frame is total garbage. | |
497 | * We may have copied it over the good part | |
498 | * of the buffer. | |
499 | * If so, we need to retry the entire operation. | |
500 | * Otherwise, ignore it. | |
501 | */ | |
502 | if (fsp->state & FC_SRB_DISCONTIG) | |
5c12c418 | 503 | goto err; |
42e9a92f RL |
504 | return; |
505 | } | |
506 | } | |
507 | ||
508 | if (fsp->xfer_contig_end == start_offset) | |
509 | fsp->xfer_contig_end += copy_len; | |
510 | fsp->xfer_len += copy_len; | |
511 | ||
512 | /* | |
513 | * In the very rare event that this data arrived after the response | |
514 | * and completes the transfer, call the completion handler. | |
515 | */ | |
516 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
517 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
518 | fc_fcp_complete_locked(fsp); | |
5c12c418 VD |
519 | return; |
520 | err: | |
521 | fc_fcp_recovery(fsp); | |
42e9a92f RL |
522 | } |
523 | ||
34f42a07 | 524 | /** |
3a3b42bf RL |
525 | * fc_fcp_send_data() - Send SCSI data to a target |
526 | * @fsp: The FCP packet the data is on | |
527 | * @sp: The sequence the data is to be sent on | |
528 | * @offset: The starting offset for this data request | |
529 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
530 | * |
531 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf | 532 | * If the LLD is capable of sequence offload then send down the |
9ddc5b6f | 533 | * seq_blen amount of data in single frame, otherwise send |
3a3b42bf RL |
534 | * multiple frames of the maximum frame payload supported by |
535 | * the target port. | |
42e9a92f RL |
536 | */ |
537 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
538 | size_t offset, size_t seq_blen) | |
539 | { | |
540 | struct fc_exch *ep; | |
541 | struct scsi_cmnd *sc; | |
542 | struct scatterlist *sg; | |
543 | struct fc_frame *fp = NULL; | |
3a3b42bf | 544 | struct fc_lport *lport = fsp->lp; |
18fa11ef | 545 | struct page *page; |
42e9a92f RL |
546 | size_t remaining; |
547 | size_t t_blen; | |
548 | size_t tlen; | |
549 | size_t sg_bytes; | |
550 | size_t frame_offset, fh_parm_offset; | |
18fa11ef | 551 | size_t off; |
42e9a92f RL |
552 | int error; |
553 | void *data = NULL; | |
554 | void *page_addr; | |
3a3b42bf | 555 | int using_sg = lport->sg_supp; |
42e9a92f RL |
556 | u32 f_ctl; |
557 | ||
558 | WARN_ON(seq_blen <= 0); | |
559 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
560 | /* this should never happen */ | |
7414705e RL |
561 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
562 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
563 | fc_fcp_send_abort(fsp); |
564 | return 0; | |
565 | } else if (offset != fsp->xfer_len) { | |
566 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
567 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
568 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
569 | } |
570 | ||
571 | /* | |
572 | * if LLD is capable of seq_offload then set transport | |
573 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
574 | * to max FC frame payload previously set in fsp->max_payload. | |
575 | */ | |
276d6814 | 576 | t_blen = fsp->max_payload; |
3a3b42bf RL |
577 | if (lport->seq_offload) { |
578 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 579 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 580 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
581 | } |
582 | ||
42e9a92f RL |
583 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); |
584 | if (t_blen > 512) | |
585 | t_blen &= ~(512 - 1); /* round down to block size */ | |
586 | WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */ | |
587 | sc = fsp->cmd; | |
588 | ||
589 | remaining = seq_blen; | |
590 | fh_parm_offset = frame_offset = offset; | |
591 | tlen = 0; | |
3a3b42bf | 592 | seq = lport->tt.seq_start_next(seq); |
42e9a92f RL |
593 | f_ctl = FC_FC_REL_OFF; |
594 | WARN_ON(!seq); | |
595 | ||
42e9a92f RL |
596 | sg = scsi_sglist(sc); |
597 | ||
598 | while (remaining > 0 && sg) { | |
599 | if (offset >= sg->length) { | |
600 | offset -= sg->length; | |
601 | sg = sg_next(sg); | |
602 | continue; | |
603 | } | |
604 | if (!fp) { | |
605 | tlen = min(t_blen, remaining); | |
606 | ||
607 | /* | |
608 | * TODO. Temporary workaround. fc_seq_send() can't | |
609 | * handle odd lengths in non-linear skbs. | |
610 | * This will be the final fragment only. | |
611 | */ | |
612 | if (tlen % 4) | |
613 | using_sg = 0; | |
a7bbc7f4 VD |
614 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
615 | if (!fp) | |
616 | return -ENOMEM; | |
617 | ||
618 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
619 | fh_parm_offset = frame_offset; |
620 | fr_max_payload(fp) = fsp->max_payload; | |
621 | } | |
18fa11ef CL |
622 | |
623 | off = offset + sg->offset; | |
42e9a92f | 624 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
625 | sg_bytes = min(sg_bytes, |
626 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
627 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 628 | if (using_sg) { |
18fa11ef | 629 | get_page(page); |
42e9a92f RL |
630 | skb_fill_page_desc(fp_skb(fp), |
631 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 632 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
633 | fp_skb(fp)->data_len += sg_bytes; |
634 | fr_len(fp) += sg_bytes; | |
635 | fp_skb(fp)->truesize += PAGE_SIZE; | |
636 | } else { | |
42e9a92f RL |
637 | /* |
638 | * The scatterlist item may be bigger than PAGE_SIZE, | |
639 | * but we must not cross pages inside the kmap. | |
640 | */ | |
18fa11ef | 641 | page_addr = kmap_atomic(page, KM_SOFTIRQ0); |
42e9a92f RL |
642 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
643 | sg_bytes); | |
644 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
645 | data += sg_bytes; | |
646 | } | |
647 | offset += sg_bytes; | |
648 | frame_offset += sg_bytes; | |
649 | tlen -= sg_bytes; | |
650 | remaining -= sg_bytes; | |
651 | ||
d37322a4 YZ |
652 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
653 | (tlen)) | |
42e9a92f RL |
654 | continue; |
655 | ||
656 | /* | |
657 | * Send sequence with transfer sequence initiative in case | |
658 | * this is last FCP frame of the sequence. | |
659 | */ | |
660 | if (remaining == 0) | |
661 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
662 | ||
663 | ep = fc_seq_exch(seq); | |
664 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
665 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
666 | ||
667 | /* | |
668 | * send fragment using for a sequence. | |
669 | */ | |
3a3b42bf | 670 | error = lport->tt.seq_send(lport, seq, fp); |
42e9a92f RL |
671 | if (error) { |
672 | WARN_ON(1); /* send error should be rare */ | |
673 | fc_fcp_retry_cmd(fsp); | |
674 | return 0; | |
675 | } | |
676 | fp = NULL; | |
677 | } | |
678 | fsp->xfer_len += seq_blen; /* premature count? */ | |
679 | return 0; | |
680 | } | |
681 | ||
3a3b42bf RL |
682 | /** |
683 | * fc_fcp_abts_resp() - Send an ABTS response | |
684 | * @fsp: The FCP packet that is being aborted | |
685 | * @fp: The response frame | |
686 | */ | |
42e9a92f RL |
687 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
688 | { | |
689 | int ba_done = 1; | |
690 | struct fc_ba_rjt *brp; | |
691 | struct fc_frame_header *fh; | |
692 | ||
693 | fh = fc_frame_header_get(fp); | |
694 | switch (fh->fh_r_ctl) { | |
695 | case FC_RCTL_BA_ACC: | |
696 | break; | |
697 | case FC_RCTL_BA_RJT: | |
698 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
699 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
700 | break; | |
701 | /* fall thru */ | |
702 | default: | |
703 | /* | |
704 | * we will let the command timeout | |
705 | * and scsi-ml recover in this case, | |
706 | * therefore cleared the ba_done flag. | |
707 | */ | |
708 | ba_done = 0; | |
709 | } | |
710 | ||
711 | if (ba_done) { | |
712 | fsp->state |= FC_SRB_ABORTED; | |
713 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
714 | ||
715 | if (fsp->wait_for_comp) | |
716 | complete(&fsp->tm_done); | |
717 | else | |
718 | fc_fcp_complete_locked(fsp); | |
719 | } | |
720 | } | |
721 | ||
34f42a07 | 722 | /** |
3a3b42bf | 723 | * fc_fcp_recv() - Reveive an FCP frame |
34f42a07 | 724 | * @seq: The sequence the frame is on |
3a3b42bf | 725 | * @fp: The received frame |
34f42a07 | 726 | * @arg: The related FCP packet |
42e9a92f | 727 | * |
3a3b42bf RL |
728 | * Context: Called from Soft IRQ context. Can not be called |
729 | * holding the FCP packet list lock. | |
42e9a92f RL |
730 | */ |
731 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
732 | { | |
733 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 734 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
735 | struct fc_frame_header *fh; |
736 | struct fcp_txrdy *dd; | |
737 | u8 r_ctl; | |
738 | int rc = 0; | |
739 | ||
c46be11a VD |
740 | if (IS_ERR(fp)) { |
741 | fc_fcp_error(fsp, fp); | |
742 | return; | |
743 | } | |
42e9a92f RL |
744 | |
745 | fh = fc_frame_header_get(fp); | |
746 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 747 | |
a29e7646 | 748 | if (!(lport->state & LPORT_ST_READY)) |
42e9a92f RL |
749 | goto out; |
750 | if (fc_fcp_lock_pkt(fsp)) | |
751 | goto out; | |
752 | fsp->last_pkt_time = jiffies; | |
753 | ||
754 | if (fh->fh_type == FC_TYPE_BLS) { | |
755 | fc_fcp_abts_resp(fsp, fp); | |
756 | goto unlock; | |
757 | } | |
758 | ||
759 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
760 | goto unlock; | |
761 | ||
762 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
763 | /* | |
764 | * received XFER RDY from the target | |
765 | * need to send data to the target | |
766 | */ | |
767 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
768 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
769 | WARN_ON(!dd); | |
770 | ||
771 | rc = fc_fcp_send_data(fsp, seq, | |
772 | (size_t) ntohl(dd->ft_data_ro), | |
773 | (size_t) ntohl(dd->ft_burst_len)); | |
774 | if (!rc) | |
775 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
776 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
777 | /* | |
778 | * received a DATA frame | |
779 | * next we will copy the data to the system buffer | |
780 | */ | |
781 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
782 | fc_fcp_recv_data(fsp, fp); | |
783 | seq->rec_data = fsp->xfer_contig_end; | |
784 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
785 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
786 | ||
787 | fc_fcp_resp(fsp, fp); | |
788 | } else { | |
7414705e | 789 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
790 | } |
791 | unlock: | |
792 | fc_fcp_unlock_pkt(fsp); | |
793 | out: | |
794 | fc_frame_free(fp); | |
42e9a92f RL |
795 | } |
796 | ||
3a3b42bf RL |
797 | /** |
798 | * fc_fcp_resp() - Handler for FCP responses | |
799 | * @fsp: The FCP packet the response is for | |
800 | * @fp: The response frame | |
801 | */ | |
42e9a92f RL |
802 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
803 | { | |
804 | struct fc_frame_header *fh; | |
805 | struct fcp_resp *fc_rp; | |
806 | struct fcp_resp_ext *rp_ex; | |
807 | struct fcp_resp_rsp_info *fc_rp_info; | |
808 | u32 plen; | |
809 | u32 expected_len; | |
810 | u32 respl = 0; | |
811 | u32 snsl = 0; | |
812 | u8 flags = 0; | |
813 | ||
814 | plen = fr_len(fp); | |
815 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
816 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
817 | goto len_err; | |
818 | plen -= sizeof(*fh); | |
819 | fc_rp = (struct fcp_resp *)(fh + 1); | |
820 | fsp->cdb_status = fc_rp->fr_status; | |
821 | flags = fc_rp->fr_flags; | |
822 | fsp->scsi_comp_flags = flags; | |
823 | expected_len = fsp->data_len; | |
824 | ||
b277d2aa YZ |
825 | /* if ddp, update xfer len */ |
826 | fc_fcp_ddp_done(fsp); | |
827 | ||
42e9a92f RL |
828 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
829 | rp_ex = (void *)(fc_rp + 1); | |
830 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
831 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
832 | goto len_err; | |
833 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
834 | if (flags & FCP_RSP_LEN_VAL) { | |
835 | respl = ntohl(rp_ex->fr_rsp_len); | |
836 | if (respl != sizeof(*fc_rp_info)) | |
837 | goto len_err; | |
838 | if (fsp->wait_for_comp) { | |
839 | /* Abuse cdb_status for rsp code */ | |
840 | fsp->cdb_status = fc_rp_info->rsp_code; | |
841 | complete(&fsp->tm_done); | |
842 | /* | |
843 | * tmfs will not have any scsi cmd so | |
844 | * exit here | |
845 | */ | |
846 | return; | |
63ac4bbf | 847 | } |
42e9a92f RL |
848 | } |
849 | if (flags & FCP_SNS_LEN_VAL) { | |
850 | snsl = ntohl(rp_ex->fr_sns_len); | |
851 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
852 | snsl = SCSI_SENSE_BUFFERSIZE; | |
853 | memcpy(fsp->cmd->sense_buffer, | |
854 | (char *)fc_rp_info + respl, snsl); | |
855 | } | |
856 | } | |
857 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
858 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
859 | goto len_err; | |
860 | if (flags & FCP_RESID_UNDER) { | |
861 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
862 | /* | |
863 | * The cmnd->underflow is the minimum number of | |
864 | * bytes that must be transfered for this | |
865 | * command. Provided a sense condition is not | |
866 | * present, make sure the actual amount | |
867 | * transferred is at least the underflow value | |
868 | * or fail. | |
869 | */ | |
870 | if (!(flags & FCP_SNS_LEN_VAL) && | |
871 | (fc_rp->fr_status == 0) && | |
872 | (scsi_bufflen(fsp->cmd) - | |
873 | fsp->scsi_resid) < fsp->cmd->underflow) | |
874 | goto err; | |
875 | expected_len -= fsp->scsi_resid; | |
876 | } else { | |
877 | fsp->status_code = FC_ERROR; | |
878 | } | |
879 | } | |
880 | } | |
881 | fsp->state |= FC_SRB_RCV_STATUS; | |
882 | ||
883 | /* | |
884 | * Check for missing or extra data frames. | |
885 | */ | |
886 | if (unlikely(fsp->xfer_len != expected_len)) { | |
887 | if (fsp->xfer_len < expected_len) { | |
888 | /* | |
889 | * Some data may be queued locally, | |
890 | * Wait a at least one jiffy to see if it is delivered. | |
891 | * If this expires without data, we may do SRR. | |
892 | */ | |
893 | fc_fcp_timer_set(fsp, 2); | |
894 | return; | |
895 | } | |
896 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 897 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
898 | "len %x, data len %x\n", |
899 | fsp->rport->port_id, | |
900 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
901 | } |
902 | fc_fcp_complete_locked(fsp); | |
903 | return; | |
904 | ||
905 | len_err: | |
7414705e RL |
906 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
907 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
908 | err: |
909 | fsp->status_code = FC_ERROR; | |
910 | fc_fcp_complete_locked(fsp); | |
911 | } | |
912 | ||
913 | /** | |
3a3b42bf RL |
914 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
915 | * fcp_pkt lock held | |
916 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
917 | * |
918 | * This function may sleep if a timer is pending. The packet lock must be | |
919 | * held, and the host lock must not be held. | |
920 | */ | |
921 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
922 | { | |
3a3b42bf | 923 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
924 | struct fc_seq *seq; |
925 | struct fc_exch *ep; | |
926 | u32 f_ctl; | |
927 | ||
928 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
929 | return; | |
930 | ||
931 | if (fsp->state & FC_SRB_ABORTED) { | |
932 | if (!fsp->status_code) | |
933 | fsp->status_code = FC_CMD_ABORTED; | |
934 | } else { | |
935 | /* | |
936 | * Test for transport underrun, independent of response | |
937 | * underrun status. | |
938 | */ | |
939 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
940 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
941 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
942 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 943 | fsp->io_status = 0; |
42e9a92f RL |
944 | } |
945 | } | |
946 | ||
947 | seq = fsp->seq_ptr; | |
948 | if (seq) { | |
949 | fsp->seq_ptr = NULL; | |
950 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
951 | struct fc_frame *conf_frame; | |
952 | struct fc_seq *csp; | |
953 | ||
3a3b42bf | 954 | csp = lport->tt.seq_start_next(seq); |
c46be11a | 955 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
956 | if (conf_frame) { |
957 | f_ctl = FC_FC_SEQ_INIT; | |
958 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
959 | ep = fc_seq_exch(seq); | |
960 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
961 | ep->did, ep->sid, | |
962 | FC_TYPE_FCP, f_ctl, 0); | |
3a3b42bf | 963 | lport->tt.seq_send(lport, csp, conf_frame); |
42e9a92f RL |
964 | } |
965 | } | |
3a3b42bf | 966 | lport->tt.exch_done(seq); |
42e9a92f RL |
967 | } |
968 | fc_io_compl(fsp); | |
969 | } | |
970 | ||
3a3b42bf RL |
971 | /** |
972 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
973 | * @fsp: The FCP packet whose exchanges should be canceled | |
974 | * @error: The reason for the cancellation | |
975 | */ | |
42e9a92f RL |
976 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
977 | { | |
3a3b42bf | 978 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
979 | |
980 | if (fsp->seq_ptr) { | |
3a3b42bf | 981 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
982 | fsp->seq_ptr = NULL; |
983 | } | |
984 | fsp->status_code = error; | |
985 | } | |
986 | ||
987 | /** | |
3a3b42bf RL |
988 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
989 | * @lport: The local port whose exchanges should be canceled | |
990 | * @id: The target's ID | |
991 | * @lun: The LUN | |
992 | * @error: The reason for cancellation | |
42e9a92f RL |
993 | * |
994 | * If lun or id is -1, they are ignored. | |
995 | */ | |
3a3b42bf | 996 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
997 | unsigned int lun, int error) |
998 | { | |
3a3b42bf | 999 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
1000 | struct fc_fcp_pkt *fsp; |
1001 | struct scsi_cmnd *sc_cmd; | |
1002 | unsigned long flags; | |
1003 | ||
c1ecb90a | 1004 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1005 | restart: |
1006 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1007 | sc_cmd = fsp->cmd; | |
1008 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1009 | continue; | |
1010 | ||
1011 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1012 | continue; | |
1013 | ||
1014 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1015 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1016 | |
1017 | if (!fc_fcp_lock_pkt(fsp)) { | |
1018 | fc_fcp_cleanup_cmd(fsp, error); | |
1019 | fc_io_compl(fsp); | |
1020 | fc_fcp_unlock_pkt(fsp); | |
1021 | } | |
1022 | ||
1023 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1024 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1025 | /* |
1026 | * while we dropped the lock multiple pkts could | |
1027 | * have been released, so we have to start over. | |
1028 | */ | |
1029 | goto restart; | |
1030 | } | |
c1ecb90a | 1031 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1032 | } |
1033 | ||
3a3b42bf RL |
1034 | /** |
1035 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1036 | * @lport: The local port whose exchanges are to be aborted | |
1037 | */ | |
1038 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1039 | { |
3a3b42bf | 1040 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1041 | } |
1042 | ||
1043 | /** | |
3a3b42bf RL |
1044 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1045 | * @lport: The local port to send the FCP packet on | |
1046 | * @fsp: The FCP packet to send | |
42e9a92f | 1047 | * |
3a3b42bf | 1048 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1049 | * Locks: Called without locks held |
42e9a92f | 1050 | */ |
3a3b42bf | 1051 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1052 | { |
3a3b42bf | 1053 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1054 | unsigned long flags; |
42e9a92f RL |
1055 | int rc; |
1056 | ||
1057 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1058 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1059 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1060 | ||
1061 | int_to_scsilun(fsp->cmd->device->lun, | |
1062 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1063 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
42e9a92f | 1064 | |
c1ecb90a CL |
1065 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1066 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1067 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1068 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1069 | if (unlikely(rc)) { |
1070 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f | 1071 | list_del(&fsp->list); |
c1ecb90a CL |
1072 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1073 | } | |
42e9a92f RL |
1074 | |
1075 | return rc; | |
1076 | } | |
1077 | ||
3a3b42bf RL |
1078 | /** |
1079 | * fc_fcp_cmd_send() - Send a FCP command | |
1080 | * @lport: The local port to send the command on | |
1081 | * @fsp: The FCP packet the command is on | |
1082 | * @resp: The handler for the response | |
1083 | */ | |
1084 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1085 | void (*resp)(struct fc_seq *, |
1086 | struct fc_frame *fp, | |
1087 | void *arg)) | |
1088 | { | |
1089 | struct fc_frame *fp; | |
1090 | struct fc_seq *seq; | |
1091 | struct fc_rport *rport; | |
3a3b42bf | 1092 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1093 | const size_t len = sizeof(fsp->cdb_cmd); |
1094 | int rc = 0; | |
1095 | ||
1096 | if (fc_fcp_lock_pkt(fsp)) | |
1097 | return 0; | |
1098 | ||
c46be11a | 1099 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1100 | if (!fp) { |
1101 | rc = -1; | |
1102 | goto unlock; | |
1103 | } | |
1104 | ||
1105 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1106 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1107 | rport = fsp->rport; |
1108 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1109 | rpriv = rport->dd_data; |
42e9a92f RL |
1110 | |
1111 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
3a3b42bf | 1112 | fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, |
42e9a92f RL |
1113 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
1114 | ||
3a3b42bf RL |
1115 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
1116 | fsp, 0); | |
42e9a92f | 1117 | if (!seq) { |
42e9a92f RL |
1118 | rc = -1; |
1119 | goto unlock; | |
1120 | } | |
1121 | fsp->last_pkt_time = jiffies; | |
1122 | fsp->seq_ptr = seq; | |
1123 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1124 | ||
1125 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); | |
1126 | fc_fcp_timer_set(fsp, | |
1127 | (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? | |
1128 | FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); | |
1129 | unlock: | |
1130 | fc_fcp_unlock_pkt(fsp); | |
1131 | return rc; | |
1132 | } | |
1133 | ||
3a3b42bf RL |
1134 | /** |
1135 | * fc_fcp_error() - Handler for FCP layer errors | |
1136 | * @fsp: The FCP packet the error is on | |
1137 | * @fp: The frame that has errored | |
42e9a92f RL |
1138 | */ |
1139 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1140 | { | |
1141 | int error = PTR_ERR(fp); | |
1142 | ||
1143 | if (fc_fcp_lock_pkt(fsp)) | |
1144 | return; | |
1145 | ||
7414705e | 1146 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1147 | fc_fcp_retry_cmd(fsp); |
1148 | goto unlock; | |
42e9a92f | 1149 | } |
7414705e | 1150 | |
42e9a92f RL |
1151 | /* |
1152 | * clear abort pending, because the lower layer | |
1153 | * decided to force completion. | |
1154 | */ | |
1155 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1156 | fsp->status_code = FC_CMD_PLOGO; | |
1157 | fc_fcp_complete_locked(fsp); | |
1158 | unlock: | |
1159 | fc_fcp_unlock_pkt(fsp); | |
1160 | } | |
1161 | ||
3a3b42bf RL |
1162 | /** |
1163 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1164 | * @fsp: The FCP packet to abort on | |
1165 | * | |
1166 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1167 | */ |
c340111d | 1168 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1169 | { |
1170 | int rc = FAILED; | |
1171 | ||
1172 | if (fc_fcp_send_abort(fsp)) | |
1173 | return FAILED; | |
1174 | ||
1175 | init_completion(&fsp->tm_done); | |
1176 | fsp->wait_for_comp = 1; | |
1177 | ||
1178 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1179 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1180 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1181 | fsp->wait_for_comp = 0; | |
1182 | ||
1183 | if (!rc) { | |
7414705e | 1184 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f RL |
1185 | rc = FAILED; |
1186 | } else if (fsp->state & FC_SRB_ABORTED) { | |
7414705e | 1187 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1188 | rc = SUCCESS; |
1189 | fc_fcp_complete_locked(fsp); | |
1190 | } | |
1191 | ||
1192 | return rc; | |
1193 | } | |
1194 | ||
3a3b42bf RL |
1195 | /** |
1196 | * fc_lun_reset_send() - Send LUN reset command | |
1197 | * @data: The FCP packet that identifies the LUN to be reset | |
42e9a92f RL |
1198 | */ |
1199 | static void fc_lun_reset_send(unsigned long data) | |
1200 | { | |
1201 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
3a3b42bf RL |
1202 | struct fc_lport *lport = fsp->lp; |
1203 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { | |
42e9a92f RL |
1204 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1205 | return; | |
1206 | if (fc_fcp_lock_pkt(fsp)) | |
1207 | return; | |
1208 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); | |
1209 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1210 | fc_fcp_unlock_pkt(fsp); | |
1211 | } | |
1212 | } | |
1213 | ||
3a3b42bf RL |
1214 | /** |
1215 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1216 | * and wait for the reply | |
1217 | * @lport: The local port to sent the comand on | |
1218 | * @fsp: The FCP packet that identifies the LUN to be reset | |
1219 | * @id: The SCSI command ID | |
1220 | * @lun: The LUN ID to be reset | |
42e9a92f | 1221 | */ |
3a3b42bf | 1222 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1223 | unsigned int id, unsigned int lun) |
1224 | { | |
1225 | int rc; | |
1226 | ||
1227 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1228 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1229 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1230 | ||
1231 | fsp->wait_for_comp = 1; | |
1232 | init_completion(&fsp->tm_done); | |
1233 | ||
1234 | fc_lun_reset_send((unsigned long)fsp); | |
1235 | ||
1236 | /* | |
1237 | * wait for completion of reset | |
1238 | * after that make sure all commands are terminated | |
1239 | */ | |
1240 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1241 | ||
1242 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1243 | fsp->state |= FC_SRB_COMPL; | |
1244 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1245 | ||
1246 | del_timer_sync(&fsp->timer); | |
1247 | ||
1248 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1249 | if (fsp->seq_ptr) { | |
3a3b42bf | 1250 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1251 | fsp->seq_ptr = NULL; |
1252 | } | |
1253 | fsp->wait_for_comp = 0; | |
1254 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1255 | ||
1256 | if (!rc) { | |
3a3b42bf | 1257 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1258 | return FAILED; |
1259 | } | |
1260 | ||
1261 | /* cdb_status holds the tmf's rsp code */ | |
1262 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1263 | return FAILED; | |
1264 | ||
3a3b42bf RL |
1265 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1266 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1267 | return SUCCESS; |
1268 | } | |
1269 | ||
3a3b42bf RL |
1270 | /** |
1271 | * fc_tm_done() - Task Managment response handler | |
1272 | * @seq: The sequence that the response is on | |
1273 | * @fp: The response frame | |
1274 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1275 | */ |
1276 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1277 | { | |
1278 | struct fc_fcp_pkt *fsp = arg; | |
1279 | struct fc_frame_header *fh; | |
1280 | ||
1281 | if (IS_ERR(fp)) { | |
1282 | /* | |
1283 | * If there is an error just let it timeout or wait | |
1284 | * for TMF to be aborted if it timedout. | |
1285 | * | |
1286 | * scsi-eh will escalate for when either happens. | |
1287 | */ | |
1288 | return; | |
1289 | } | |
1290 | ||
1291 | if (fc_fcp_lock_pkt(fsp)) | |
1292 | return; | |
1293 | ||
1294 | /* | |
1295 | * raced with eh timeout handler. | |
1296 | */ | |
1297 | if (!fsp->seq_ptr || !fsp->wait_for_comp) { | |
1298 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1299 | return; | |
1300 | } | |
1301 | ||
1302 | fh = fc_frame_header_get(fp); | |
1303 | if (fh->fh_type != FC_TYPE_BLS) | |
1304 | fc_fcp_resp(fsp, fp); | |
1305 | fsp->seq_ptr = NULL; | |
1306 | fsp->lp->tt.exch_done(seq); | |
1307 | fc_frame_free(fp); | |
1308 | fc_fcp_unlock_pkt(fsp); | |
1309 | } | |
1310 | ||
3a3b42bf RL |
1311 | /** |
1312 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1313 | * @lport: The local port to be cleaned up | |
1314 | */ | |
1315 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1316 | { |
3a3b42bf | 1317 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1318 | } |
1319 | ||
3a3b42bf RL |
1320 | /** |
1321 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
1322 | * @data: The FCP packet that has timed out | |
42e9a92f | 1323 | * |
3a3b42bf RL |
1324 | * If REC is supported then just issue it and return. The REC exchange will |
1325 | * complete or time out and recovery can continue at that point. Otherwise, | |
1326 | * if the response has been received without all the data it has been | |
1327 | * ER_TIMEOUT since the response was received. If the response has not been | |
1328 | * received we see if data was received recently. If it has been then we | |
1329 | * continue waiting, otherwise, we abort the command. | |
42e9a92f RL |
1330 | */ |
1331 | static void fc_fcp_timeout(unsigned long data) | |
1332 | { | |
1333 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1334 | struct fc_rport *rport = fsp->rport; | |
3a3b42bf | 1335 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1336 | |
1337 | if (fc_fcp_lock_pkt(fsp)) | |
1338 | return; | |
1339 | ||
1340 | if (fsp->cdb_cmd.fc_tm_flags) | |
1341 | goto unlock; | |
1342 | ||
1343 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1344 | ||
3a3b42bf | 1345 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
42e9a92f RL |
1346 | fc_fcp_rec(fsp); |
1347 | else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), | |
1348 | jiffies)) | |
1349 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); | |
1350 | else if (fsp->state & FC_SRB_RCV_STATUS) | |
1351 | fc_fcp_complete_locked(fsp); | |
1352 | else | |
5c12c418 | 1353 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1354 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1355 | unlock: | |
1356 | fc_fcp_unlock_pkt(fsp); | |
1357 | } | |
1358 | ||
3a3b42bf RL |
1359 | /** |
1360 | * fc_fcp_rec() - Send a REC ELS request | |
1361 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1362 | */ |
1363 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1364 | { | |
3a3b42bf | 1365 | struct fc_lport *lport; |
42e9a92f RL |
1366 | struct fc_frame *fp; |
1367 | struct fc_rport *rport; | |
3a3b42bf | 1368 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1369 | |
3a3b42bf | 1370 | lport = fsp->lp; |
42e9a92f | 1371 | rport = fsp->rport; |
3a3b42bf RL |
1372 | rpriv = rport->dd_data; |
1373 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1374 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1375 | fsp->io_status = 0; |
42e9a92f RL |
1376 | fc_fcp_complete_locked(fsp); |
1377 | return; | |
1378 | } | |
c46be11a | 1379 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1380 | if (!fp) |
1381 | goto retry; | |
1382 | ||
1383 | fr_seq(fp) = fsp->seq_ptr; | |
1384 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
3a3b42bf | 1385 | fc_host_port_id(rpriv->local_port->host), FC_TYPE_ELS, |
42e9a92f | 1386 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
3a3b42bf RL |
1387 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1388 | fc_fcp_rec_resp, fsp, | |
1389 | jiffies_to_msecs(FC_SCSI_REC_TOV))) { | |
42e9a92f RL |
1390 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1391 | return; | |
1392 | } | |
42e9a92f RL |
1393 | retry: |
1394 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1395 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1396 | else | |
5c12c418 | 1397 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1398 | } |
1399 | ||
3a3b42bf RL |
1400 | /** |
1401 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1402 | * @seq: The sequence the response is on | |
1403 | * @fp: The response frame | |
1404 | * @arg: The FCP packet the response is on | |
1405 | * | |
1406 | * If the response is a reject then the scsi layer will handle | |
1407 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1408 | * set the timeout and return. If the I/O was completed then complete the | |
1409 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1410 | */ |
1411 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1412 | { | |
1413 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1414 | struct fc_els_rec_acc *recp; | |
1415 | struct fc_els_ls_rjt *rjt; | |
1416 | u32 e_stat; | |
1417 | u8 opcode; | |
1418 | u32 offset; | |
1419 | enum dma_data_direction data_dir; | |
1420 | enum fc_rctl r_ctl; | |
3a3b42bf | 1421 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1422 | |
1423 | if (IS_ERR(fp)) { | |
1424 | fc_fcp_rec_error(fsp, fp); | |
1425 | return; | |
1426 | } | |
1427 | ||
1428 | if (fc_fcp_lock_pkt(fsp)) | |
1429 | goto out; | |
1430 | ||
1431 | fsp->recov_retry = 0; | |
1432 | opcode = fc_frame_payload_op(fp); | |
1433 | if (opcode == ELS_LS_RJT) { | |
1434 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1435 | switch (rjt->er_reason) { | |
1436 | default: | |
7414705e RL |
1437 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1438 | "reason %d expl %d\n", | |
1439 | fsp->rport->port_id, rjt->er_reason, | |
1440 | rjt->er_explan); | |
42e9a92f RL |
1441 | /* fall through */ |
1442 | case ELS_RJT_UNSUP: | |
7414705e | 1443 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1444 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1445 | /* |
1446 | * if we do not spport RECs or got some bogus | |
1447 | * reason then resetup timer so we check for | |
1448 | * making progress. | |
1449 | */ | |
3a3b42bf | 1450 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1451 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); |
1452 | break; | |
1453 | case ELS_RJT_LOGIC: | |
1454 | case ELS_RJT_UNAB: | |
1455 | /* | |
1456 | * If no data transfer, the command frame got dropped | |
1457 | * so we just retry. If data was transferred, we | |
1458 | * lost the response but the target has no record, | |
1459 | * so we abort and retry. | |
1460 | */ | |
1461 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1462 | fsp->xfer_len == 0) { | |
1463 | fc_fcp_retry_cmd(fsp); | |
1464 | break; | |
1465 | } | |
5c12c418 | 1466 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1467 | break; |
1468 | } | |
1469 | } else if (opcode == ELS_LS_ACC) { | |
1470 | if (fsp->state & FC_SRB_ABORTED) | |
1471 | goto unlock_out; | |
1472 | ||
1473 | data_dir = fsp->cmd->sc_data_direction; | |
1474 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1475 | offset = ntohl(recp->reca_fc4value); | |
1476 | e_stat = ntohl(recp->reca_e_stat); | |
1477 | ||
1478 | if (e_stat & ESB_ST_COMPLETE) { | |
1479 | ||
1480 | /* | |
1481 | * The exchange is complete. | |
1482 | * | |
1483 | * For output, we must've lost the response. | |
1484 | * For input, all data must've been sent. | |
1485 | * We lost may have lost the response | |
1486 | * (and a confirmation was requested) and maybe | |
1487 | * some data. | |
1488 | * | |
1489 | * If all data received, send SRR | |
1490 | * asking for response. If partial data received, | |
1491 | * or gaps, SRR requests data at start of gap. | |
1492 | * Recovery via SRR relies on in-order-delivery. | |
1493 | */ | |
1494 | if (data_dir == DMA_TO_DEVICE) { | |
1495 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1496 | } else if (fsp->xfer_contig_end == offset) { | |
1497 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1498 | } else { | |
1499 | offset = fsp->xfer_contig_end; | |
1500 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1501 | } | |
1502 | fc_fcp_srr(fsp, r_ctl, offset); | |
1503 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
1504 | ||
1505 | /* | |
1506 | * The remote port has the initiative, so just | |
1507 | * keep waiting for it to complete. | |
1508 | */ | |
1509 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1510 | } else { | |
1511 | ||
1512 | /* | |
1513 | * The exchange is incomplete, we have seq. initiative. | |
1514 | * Lost response with requested confirmation, | |
1515 | * lost confirmation, lost transfer ready or | |
1516 | * lost write data. | |
1517 | * | |
1518 | * For output, if not all data was received, ask | |
1519 | * for transfer ready to be repeated. | |
1520 | * | |
1521 | * If we received or sent all the data, send SRR to | |
1522 | * request response. | |
1523 | * | |
1524 | * If we lost a response, we may have lost some read | |
1525 | * data as well. | |
1526 | */ | |
1527 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1528 | if (data_dir == DMA_TO_DEVICE) { | |
1529 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1530 | if (offset < fsp->data_len) | |
1531 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1532 | } else if (offset == fsp->xfer_contig_end) { | |
1533 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1534 | } else if (fsp->xfer_contig_end < offset) { | |
1535 | offset = fsp->xfer_contig_end; | |
1536 | } | |
1537 | fc_fcp_srr(fsp, r_ctl, offset); | |
1538 | } | |
1539 | } | |
1540 | unlock_out: | |
1541 | fc_fcp_unlock_pkt(fsp); | |
1542 | out: | |
1543 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1544 | fc_frame_free(fp); | |
1545 | } | |
1546 | ||
3a3b42bf RL |
1547 | /** |
1548 | * fc_fcp_rec_error() - Handler for REC errors | |
1549 | * @fsp: The FCP packet the error is on | |
1550 | * @fp: The REC frame | |
42e9a92f RL |
1551 | */ |
1552 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1553 | { | |
1554 | int error = PTR_ERR(fp); | |
1555 | ||
1556 | if (fc_fcp_lock_pkt(fsp)) | |
1557 | goto out; | |
1558 | ||
1559 | switch (error) { | |
1560 | case -FC_EX_CLOSED: | |
1561 | fc_fcp_retry_cmd(fsp); | |
1562 | break; | |
1563 | ||
1564 | default: | |
ce8b5df0 | 1565 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1566 | fsp, fsp->rport->port_id, error); |
42e9a92f RL |
1567 | fsp->status_code = FC_CMD_PLOGO; |
1568 | /* fall through */ | |
1569 | ||
1570 | case -FC_EX_TIMEOUT: | |
1571 | /* | |
1572 | * Assume REC or LS_ACC was lost. | |
1573 | * The exchange manager will have aborted REC, so retry. | |
1574 | */ | |
ce8b5df0 | 1575 | FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", |
7414705e RL |
1576 | fsp->rport->port_id, error, fsp->recov_retry, |
1577 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1578 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1579 | fc_fcp_rec(fsp); | |
1580 | else | |
5c12c418 | 1581 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1582 | break; |
1583 | } | |
1584 | fc_fcp_unlock_pkt(fsp); | |
1585 | out: | |
1586 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1587 | } | |
1588 | ||
3a3b42bf | 1589 | /** |
5c12c418 VD |
1590 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1591 | * @fsp: The FCP pkt that needs to be aborted | |
42e9a92f | 1592 | */ |
5c12c418 | 1593 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp) |
42e9a92f | 1594 | { |
5c12c418 | 1595 | fsp->status_code = FC_CMD_RECOVERY; |
42e9a92f RL |
1596 | fsp->cdb_status = 0; |
1597 | fsp->io_status = 0; | |
1598 | /* | |
1599 | * if this fails then we let the scsi command timer fire and | |
1600 | * scsi-ml escalate. | |
1601 | */ | |
1602 | fc_fcp_send_abort(fsp); | |
1603 | } | |
1604 | ||
3a3b42bf RL |
1605 | /** |
1606 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1607 | * @fsp: The FCP packet the SRR is to be sent on | |
1608 | * @r_ctl: The R_CTL field for the SRR request | |
42e9a92f RL |
1609 | * This is called after receiving status but insufficient data, or |
1610 | * when expecting status but the request has timed out. | |
1611 | */ | |
1612 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1613 | { | |
3a3b42bf | 1614 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1615 | struct fc_rport *rport; |
3a3b42bf | 1616 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1617 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1618 | struct fc_seq *seq; | |
1619 | struct fcp_srr *srr; | |
1620 | struct fc_frame *fp; | |
1621 | u8 cdb_op; | |
1622 | ||
1623 | rport = fsp->rport; | |
3a3b42bf | 1624 | rpriv = rport->dd_data; |
42e9a92f RL |
1625 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; |
1626 | ||
3a3b42bf RL |
1627 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1628 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1629 | goto retry; /* shouldn't happen */ |
c46be11a | 1630 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1631 | if (!fp) |
1632 | goto retry; | |
1633 | ||
1634 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1635 | memset(srr, 0, sizeof(*srr)); | |
1636 | srr->srr_op = ELS_SRR; | |
1637 | srr->srr_ox_id = htons(ep->oxid); | |
1638 | srr->srr_rx_id = htons(ep->rxid); | |
1639 | srr->srr_r_ctl = r_ctl; | |
1640 | srr->srr_rel_off = htonl(offset); | |
1641 | ||
1642 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
3a3b42bf | 1643 | fc_host_port_id(rpriv->local_port->host), FC_TYPE_FCP, |
42e9a92f RL |
1644 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
1645 | ||
3a3b42bf RL |
1646 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, |
1647 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); | |
8f550f93 | 1648 | if (!seq) |
42e9a92f | 1649 | goto retry; |
8f550f93 | 1650 | |
42e9a92f RL |
1651 | fsp->recov_seq = seq; |
1652 | fsp->xfer_len = offset; | |
1653 | fsp->xfer_contig_end = offset; | |
1654 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1655 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1656 | return; | |
1657 | retry: | |
1658 | fc_fcp_retry_cmd(fsp); | |
1659 | } | |
1660 | ||
3a3b42bf RL |
1661 | /** |
1662 | * fc_fcp_srr_resp() - Handler for SRR response | |
1663 | * @seq: The sequence the SRR is on | |
1664 | * @fp: The SRR frame | |
1665 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1666 | */ |
1667 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1668 | { | |
1669 | struct fc_fcp_pkt *fsp = arg; | |
1670 | struct fc_frame_header *fh; | |
1671 | ||
1672 | if (IS_ERR(fp)) { | |
1673 | fc_fcp_srr_error(fsp, fp); | |
1674 | return; | |
1675 | } | |
1676 | ||
1677 | if (fc_fcp_lock_pkt(fsp)) | |
1678 | goto out; | |
1679 | ||
1680 | fh = fc_frame_header_get(fp); | |
1681 | /* | |
1682 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1683 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1684 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1685 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1686 | * an abort response though. | |
1687 | */ | |
1688 | if (fh->fh_type == FC_TYPE_BLS) { | |
1689 | fc_fcp_unlock_pkt(fsp); | |
1690 | return; | |
1691 | } | |
1692 | ||
1693 | fsp->recov_seq = NULL; | |
1694 | switch (fc_frame_payload_op(fp)) { | |
1695 | case ELS_LS_ACC: | |
1696 | fsp->recov_retry = 0; | |
1697 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1698 | break; | |
1699 | case ELS_LS_RJT: | |
1700 | default: | |
5c12c418 | 1701 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1702 | break; |
1703 | } | |
1704 | fc_fcp_unlock_pkt(fsp); | |
1705 | fsp->lp->tt.exch_done(seq); | |
1706 | out: | |
1707 | fc_frame_free(fp); | |
1708 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1709 | } | |
1710 | ||
3a3b42bf RL |
1711 | /** |
1712 | * fc_fcp_srr_error() - Handler for SRR errors | |
1713 | * @fsp: The FCP packet that the SRR error is on | |
1714 | * @fp: The SRR frame | |
1715 | */ | |
42e9a92f RL |
1716 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1717 | { | |
1718 | if (fc_fcp_lock_pkt(fsp)) | |
1719 | goto out; | |
1720 | fsp->lp->tt.exch_done(fsp->recov_seq); | |
1721 | fsp->recov_seq = NULL; | |
1722 | switch (PTR_ERR(fp)) { | |
1723 | case -FC_EX_TIMEOUT: | |
1724 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1725 | fc_fcp_rec(fsp); | |
1726 | else | |
5c12c418 | 1727 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1728 | break; |
1729 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1730 | /* fall through */ | |
1731 | default: | |
1732 | fc_fcp_retry_cmd(fsp); | |
1733 | break; | |
1734 | } | |
1735 | fc_fcp_unlock_pkt(fsp); | |
1736 | out: | |
1737 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1738 | } | |
1739 | ||
3a3b42bf RL |
1740 | /** |
1741 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1742 | * @lport: The local port to be checked | |
1743 | */ | |
1744 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1745 | { |
1746 | /* lock ? */ | |
3a3b42bf RL |
1747 | return (lport->state == LPORT_ST_READY) && |
1748 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1749 | } |
1750 | ||
1751 | /** | |
3a3b42bf RL |
1752 | * fc_queuecommand() - The queuecommand function of the SCSI template |
1753 | * @cmd: The scsi_cmnd to be executed | |
1754 | * @done: The callback function to be called when the scsi_cmnd is complete | |
42e9a92f | 1755 | * |
3a3b42bf RL |
1756 | * This is the i/o strategy routine, called by the SCSI layer. This routine |
1757 | * is called with the host_lock held. | |
42e9a92f RL |
1758 | */ |
1759 | int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) | |
1760 | { | |
3a3b42bf | 1761 | struct fc_lport *lport; |
42e9a92f RL |
1762 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1763 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1764 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1765 | int rval; |
1766 | int rc = 0; | |
1767 | struct fcoe_dev_stats *stats; | |
1768 | ||
3a3b42bf | 1769 | lport = shost_priv(sc_cmd->device->host); |
c1ecb90a | 1770 | spin_unlock_irq(lport->host->host_lock); |
42e9a92f RL |
1771 | |
1772 | rval = fc_remote_port_chkready(rport); | |
1773 | if (rval) { | |
1774 | sc_cmd->result = rval; | |
1775 | done(sc_cmd); | |
1776 | goto out; | |
1777 | } | |
1778 | ||
1779 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1780 | /* | |
1781 | * rport is transitioning from blocked/deleted to | |
1782 | * online | |
1783 | */ | |
1784 | sc_cmd->result = DID_IMM_RETRY << 16; | |
1785 | done(sc_cmd); | |
1786 | goto out; | |
1787 | } | |
1788 | ||
3a3b42bf | 1789 | rpriv = rport->dd_data; |
42e9a92f | 1790 | |
3a3b42bf | 1791 | if (!fc_fcp_lport_queue_ready(lport)) { |
84c3e1ad VD |
1792 | if (lport->qfull) |
1793 | fc_fcp_can_queue_ramp_down(lport); | |
42e9a92f RL |
1794 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1795 | goto out; | |
1796 | } | |
1797 | ||
3a3b42bf | 1798 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1799 | if (fsp == NULL) { |
1800 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1801 | goto out; | |
1802 | } | |
1803 | ||
1804 | /* | |
1805 | * build the libfc request pkt | |
1806 | */ | |
1807 | fsp->cmd = sc_cmd; /* save the cmd */ | |
3a3b42bf | 1808 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f | 1809 | fsp->rport = rport; /* set the remote port ptr */ |
5e472d07 | 1810 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
1811 | sc_cmd->scsi_done = done; |
1812 | ||
1813 | /* | |
1814 | * set up the transfer length | |
1815 | */ | |
1816 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1817 | fsp->xfer_len = 0; | |
1818 | ||
1819 | /* | |
1820 | * setup the data direction | |
1821 | */ | |
f018b73a | 1822 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f RL |
1823 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1824 | fsp->req_flags = FC_SRB_READ; | |
1825 | stats->InputRequests++; | |
1826 | stats->InputMegabytes = fsp->data_len; | |
1827 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { | |
1828 | fsp->req_flags = FC_SRB_WRITE; | |
1829 | stats->OutputRequests++; | |
1830 | stats->OutputMegabytes = fsp->data_len; | |
1831 | } else { | |
1832 | fsp->req_flags = 0; | |
1833 | stats->ControlRequests++; | |
1834 | } | |
f018b73a | 1835 | put_cpu(); |
42e9a92f | 1836 | |
3a3b42bf | 1837 | fsp->tgt_flags = rpriv->flags; |
42e9a92f RL |
1838 | |
1839 | init_timer(&fsp->timer); | |
1840 | fsp->timer.data = (unsigned long)fsp; | |
1841 | ||
1842 | /* | |
1843 | * send it to the lower layer | |
1844 | * if we get -1 return then put the request in the pending | |
1845 | * queue. | |
1846 | */ | |
3a3b42bf | 1847 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1848 | if (rval != 0) { |
1849 | fsp->state = FC_SRB_FREE; | |
1850 | fc_fcp_pkt_release(fsp); | |
1851 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1852 | } | |
1853 | out: | |
c1ecb90a | 1854 | spin_lock_irq(lport->host->host_lock); |
42e9a92f RL |
1855 | return rc; |
1856 | } | |
1857 | EXPORT_SYMBOL(fc_queuecommand); | |
1858 | ||
1859 | /** | |
3a3b42bf RL |
1860 | * fc_io_compl() - Handle responses for completed commands |
1861 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1862 | * |
3a3b42bf | 1863 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1864 | * The fcp packet lock must be held when calling. |
1865 | */ | |
1866 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1867 | { | |
1868 | struct fc_fcp_internal *si; | |
1869 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1870 | struct fc_lport *lport; |
42e9a92f RL |
1871 | unsigned long flags; |
1872 | ||
b277d2aa YZ |
1873 | /* release outstanding ddp context */ |
1874 | fc_fcp_ddp_done(fsp); | |
1875 | ||
42e9a92f RL |
1876 | fsp->state |= FC_SRB_COMPL; |
1877 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1878 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1879 | del_timer_sync(&fsp->timer); | |
1880 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1881 | } | |
1882 | ||
3a3b42bf RL |
1883 | lport = fsp->lp; |
1884 | si = fc_get_scsi_internal(lport); | |
c1ecb90a | 1885 | if (!fsp->cmd) |
42e9a92f | 1886 | return; |
42e9a92f RL |
1887 | |
1888 | /* | |
84c3e1ad VD |
1889 | * if can_queue ramp down is done then try can_queue ramp up |
1890 | * since commands are completing now. | |
42e9a92f | 1891 | */ |
84c3e1ad VD |
1892 | if (si->last_can_queue_ramp_down_time) |
1893 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1894 | |
1895 | sc_cmd = fsp->cmd; | |
1896 | fsp->cmd = NULL; | |
1897 | ||
c1ecb90a | 1898 | if (!sc_cmd->SCp.ptr) |
42e9a92f | 1899 | return; |
42e9a92f RL |
1900 | |
1901 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; | |
1902 | switch (fsp->status_code) { | |
1903 | case FC_COMPLETE: | |
1904 | if (fsp->cdb_status == 0) { | |
1905 | /* | |
1906 | * good I/O status | |
1907 | */ | |
1908 | sc_cmd->result = DID_OK << 16; | |
1909 | if (fsp->scsi_resid) | |
1910 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1911 | } else { |
1912 | /* | |
1913 | * transport level I/O was ok but scsi | |
1914 | * has non zero status | |
1915 | */ | |
1916 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1917 | } | |
1918 | break; | |
1919 | case FC_ERROR: | |
b3ef990c RL |
1920 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1921 | "due to FC_ERROR\n"); | |
42e9a92f RL |
1922 | sc_cmd->result = DID_ERROR << 16; |
1923 | break; | |
1924 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1925 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1926 | /* |
1927 | * scsi status is good but transport level | |
26d9cab5 | 1928 | * underrun. |
42e9a92f | 1929 | */ |
b3ef990c RL |
1930 | if (fsp->state & FC_SRB_RCV_STATUS) { |
1931 | sc_cmd->result = DID_OK << 16; | |
1932 | } else { | |
1933 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
1934 | " due to FC_DATA_UNDRUN (trans)\n"); | |
1935 | sc_cmd->result = DID_ERROR << 16; | |
1936 | } | |
42e9a92f RL |
1937 | } else { |
1938 | /* | |
1939 | * scsi got underrun, this is an error | |
1940 | */ | |
b3ef990c RL |
1941 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1942 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
42e9a92f RL |
1943 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
1944 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1945 | } | |
1946 | break; | |
1947 | case FC_DATA_OVRRUN: | |
1948 | /* | |
1949 | * overrun is an error | |
1950 | */ | |
b3ef990c RL |
1951 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1952 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
1953 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
1954 | break; | |
1955 | case FC_CMD_ABORTED: | |
b3ef990c RL |
1956 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1957 | "due to FC_CMD_ABORTED\n"); | |
d5e6054a | 1958 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f | 1959 | break; |
5c12c418 | 1960 | case FC_CMD_RECOVERY: |
42e9a92f RL |
1961 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; |
1962 | break; | |
1963 | case FC_CMD_RESET: | |
1964 | sc_cmd->result = (DID_RESET << 16); | |
1965 | break; | |
1966 | case FC_HRD_ERROR: | |
1967 | sc_cmd->result = (DID_NO_CONNECT << 16); | |
1968 | break; | |
1969 | default: | |
b3ef990c RL |
1970 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1971 | "due to unknown error\n"); | |
42e9a92f RL |
1972 | sc_cmd->result = (DID_ERROR << 16); |
1973 | break; | |
1974 | } | |
1975 | ||
c1ecb90a | 1976 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f | 1977 | list_del(&fsp->list); |
c1ecb90a | 1978 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1979 | sc_cmd->SCp.ptr = NULL; |
1980 | sc_cmd->scsi_done(sc_cmd); | |
42e9a92f RL |
1981 | |
1982 | /* release ref from initial allocation in queue command */ | |
1983 | fc_fcp_pkt_release(fsp); | |
1984 | } | |
1985 | ||
42e9a92f | 1986 | /** |
34f42a07 | 1987 | * fc_eh_abort() - Abort a command |
3a3b42bf | 1988 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 1989 | * |
3a3b42bf RL |
1990 | * From SCSI host template. |
1991 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
1992 | */ |
1993 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
1994 | { | |
1995 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1996 | struct fc_lport *lport; |
42e9a92f RL |
1997 | int rc = FAILED; |
1998 | unsigned long flags; | |
1999 | ||
3a3b42bf RL |
2000 | lport = shost_priv(sc_cmd->device->host); |
2001 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2002 | return rc; |
3a3b42bf | 2003 | else if (!lport->link_up) |
42e9a92f RL |
2004 | return rc; |
2005 | ||
3a3b42bf | 2006 | spin_lock_irqsave(lport->host->host_lock, flags); |
42e9a92f RL |
2007 | fsp = CMD_SP(sc_cmd); |
2008 | if (!fsp) { | |
2009 | /* command completed while scsi eh was setting up */ | |
3a3b42bf | 2010 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
2011 | return SUCCESS; |
2012 | } | |
2013 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
2014 | fc_fcp_pkt_hold(fsp); | |
3a3b42bf | 2015 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
2016 | |
2017 | if (fc_fcp_lock_pkt(fsp)) { | |
2018 | /* completed while we were waiting for timer to be deleted */ | |
2019 | rc = SUCCESS; | |
2020 | goto release_pkt; | |
2021 | } | |
2022 | ||
c340111d | 2023 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2024 | fc_fcp_unlock_pkt(fsp); |
2025 | ||
2026 | release_pkt: | |
2027 | fc_fcp_pkt_release(fsp); | |
2028 | return rc; | |
2029 | } | |
2030 | EXPORT_SYMBOL(fc_eh_abort); | |
2031 | ||
2032 | /** | |
3a3b42bf RL |
2033 | * fc_eh_device_reset() - Reset a single LUN |
2034 | * @sc_cmd: The SCSI command which identifies the device whose | |
2035 | * LUN is to be reset | |
42e9a92f | 2036 | * |
3a3b42bf | 2037 | * Set from SCSI host template. |
42e9a92f RL |
2038 | */ |
2039 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2040 | { | |
3a3b42bf | 2041 | struct fc_lport *lport; |
42e9a92f RL |
2042 | struct fc_fcp_pkt *fsp; |
2043 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2044 | int rc = FAILED; | |
42e9a92f RL |
2045 | int rval; |
2046 | ||
2047 | rval = fc_remote_port_chkready(rport); | |
2048 | if (rval) | |
2049 | goto out; | |
2050 | ||
3a3b42bf | 2051 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2052 | |
3a3b42bf | 2053 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2054 | return rc; |
2055 | ||
ce8b5df0 | 2056 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2057 | |
3a3b42bf | 2058 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2059 | if (fsp == NULL) { |
7414705e | 2060 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2061 | goto out; |
2062 | } | |
2063 | ||
2064 | /* | |
2065 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2066 | * the sc passed in is not setup for execution like when sent | |
2067 | * through the queuecommand callout. | |
2068 | */ | |
3a3b42bf | 2069 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f RL |
2070 | fsp->rport = rport; /* set the remote port ptr */ |
2071 | ||
2072 | /* | |
2073 | * flush outstanding commands | |
2074 | */ | |
3a3b42bf | 2075 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2076 | fsp->state = FC_SRB_FREE; |
2077 | fc_fcp_pkt_release(fsp); | |
2078 | ||
2079 | out: | |
2080 | return rc; | |
2081 | } | |
2082 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2083 | ||
2084 | /** | |
3a3b42bf RL |
2085 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2086 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2087 | */ |
2088 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2089 | { | |
2090 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2091 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2092 | unsigned long wait_tmo; |
2093 | ||
3a3b42bf | 2094 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2095 | |
3a3b42bf | 2096 | lport->tt.lport_reset(lport); |
42e9a92f | 2097 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2098 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2099 | wait_tmo)) | |
42e9a92f RL |
2100 | msleep(1000); |
2101 | ||
3a3b42bf | 2102 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2103 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
ce8b5df0 | 2104 | "on port (%6.6x)\n", fc_host_port_id(lport->host)); |
42e9a92f RL |
2105 | return SUCCESS; |
2106 | } else { | |
7414705e | 2107 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2108 | "port (%6.6x) is not ready.\n", |
3a3b42bf | 2109 | fc_host_port_id(lport->host)); |
42e9a92f RL |
2110 | return FAILED; |
2111 | } | |
2112 | } | |
2113 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2114 | ||
2115 | /** | |
3a3b42bf RL |
2116 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2117 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2118 | * |
2119 | * Configures queue depth based on host's cmd_per_len. If not set | |
2120 | * then we use the libfc default. | |
2121 | */ | |
2122 | int fc_slave_alloc(struct scsi_device *sdev) | |
2123 | { | |
2124 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2125 | |
2126 | if (!rport || fc_remote_port_chkready(rport)) | |
2127 | return -ENXIO; | |
2128 | ||
14caf44c VD |
2129 | if (sdev->tagged_supported) |
2130 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2131 | else | |
2132 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2133 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2134 | ||
42e9a92f RL |
2135 | return 0; |
2136 | } | |
2137 | EXPORT_SYMBOL(fc_slave_alloc); | |
2138 | ||
3a3b42bf RL |
2139 | /** |
2140 | * fc_change_queue_depth() - Change a device's queue depth | |
2141 | * @sdev: The SCSI device whose queue depth is to change | |
2142 | * @qdepth: The new queue depth | |
2143 | * @reason: The resason for the change | |
2144 | */ | |
e881a172 | 2145 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2146 | { |
5c20848a MC |
2147 | switch (reason) { |
2148 | case SCSI_QDEPTH_DEFAULT: | |
2149 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2150 | break; | |
2151 | case SCSI_QDEPTH_QFULL: | |
2152 | scsi_track_queue_full(sdev, qdepth); | |
2153 | break; | |
229b8d72 VD |
2154 | case SCSI_QDEPTH_RAMP_UP: |
2155 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2156 | break; | |
5c20848a | 2157 | default: |
e881a172 | 2158 | return -EOPNOTSUPP; |
5c20848a | 2159 | } |
42e9a92f RL |
2160 | return sdev->queue_depth; |
2161 | } | |
2162 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2163 | ||
3a3b42bf RL |
2164 | /** |
2165 | * fc_change_queue_type() - Change a device's queue type | |
2166 | * @sdev: The SCSI device whose queue depth is to change | |
2167 | * @tag_type: Identifier for queue type | |
2168 | */ | |
42e9a92f RL |
2169 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
2170 | { | |
2171 | if (sdev->tagged_supported) { | |
2172 | scsi_set_tag_type(sdev, tag_type); | |
2173 | if (tag_type) | |
2174 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2175 | else | |
2176 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2177 | } else | |
2178 | tag_type = 0; | |
2179 | ||
2180 | return tag_type; | |
2181 | } | |
2182 | EXPORT_SYMBOL(fc_change_queue_type); | |
2183 | ||
3a3b42bf RL |
2184 | /** |
2185 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2186 | * @lport: The local port that no longer needs the FCP layer | |
2187 | */ | |
2188 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2189 | { |
3a3b42bf | 2190 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2191 | |
2192 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2193 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
ce8b5df0 | 2194 | "port (%6.6x)\n", fc_host_port_id(lport->host)); |
42e9a92f RL |
2195 | |
2196 | mempool_destroy(si->scsi_pkt_pool); | |
2197 | kfree(si); | |
3a3b42bf | 2198 | lport->scsi_priv = NULL; |
42e9a92f RL |
2199 | } |
2200 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2201 | ||
93e6d5ab RL |
2202 | int fc_setup_fcp() |
2203 | { | |
2204 | int rc = 0; | |
2205 | ||
2206 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2207 | sizeof(struct fc_fcp_pkt), | |
2208 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2209 | if (!scsi_pkt_cachep) { | |
2210 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2211 | "module load failed!"); | |
2212 | rc = -ENOMEM; | |
2213 | } | |
2214 | ||
2215 | return rc; | |
2216 | } | |
2217 | ||
2218 | void fc_destroy_fcp() | |
2219 | { | |
2220 | if (scsi_pkt_cachep) | |
2221 | kmem_cache_destroy(scsi_pkt_cachep); | |
2222 | } | |
2223 | ||
3a3b42bf RL |
2224 | /** |
2225 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2226 | * @lport: The local port to initialize the exchange layer for | |
2227 | */ | |
2228 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2229 | { |
2230 | int rc; | |
2231 | struct fc_fcp_internal *si; | |
2232 | ||
3a3b42bf RL |
2233 | if (!lport->tt.fcp_cmd_send) |
2234 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2235 | |
3a3b42bf RL |
2236 | if (!lport->tt.fcp_cleanup) |
2237 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2238 | |
3a3b42bf RL |
2239 | if (!lport->tt.fcp_abort_io) |
2240 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2241 | |
2242 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2243 | if (!si) | |
2244 | return -ENOMEM; | |
3a3b42bf | 2245 | lport->scsi_priv = si; |
84c3e1ad | 2246 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2247 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2248 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2249 | |
2250 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2251 | if (!si->scsi_pkt_pool) { | |
2252 | rc = -ENOMEM; | |
2253 | goto free_internal; | |
2254 | } | |
2255 | return 0; | |
2256 | ||
2257 | free_internal: | |
2258 | kfree(si); | |
2259 | return rc; | |
2260 | } | |
2261 | EXPORT_SYMBOL(fc_fcp_init); |