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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> | |
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", |
7b2787ec | 493 | lport->port_id); |
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 | if (t_blen > 512) |
584 | t_blen &= ~(512 - 1); /* round down to block size */ | |
42e9a92f RL |
585 | sc = fsp->cmd; |
586 | ||
587 | remaining = seq_blen; | |
588 | fh_parm_offset = frame_offset = offset; | |
589 | tlen = 0; | |
3a3b42bf | 590 | seq = lport->tt.seq_start_next(seq); |
42e9a92f RL |
591 | f_ctl = FC_FC_REL_OFF; |
592 | WARN_ON(!seq); | |
593 | ||
42e9a92f RL |
594 | sg = scsi_sglist(sc); |
595 | ||
596 | while (remaining > 0 && sg) { | |
597 | if (offset >= sg->length) { | |
598 | offset -= sg->length; | |
599 | sg = sg_next(sg); | |
600 | continue; | |
601 | } | |
602 | if (!fp) { | |
603 | tlen = min(t_blen, remaining); | |
604 | ||
605 | /* | |
606 | * TODO. Temporary workaround. fc_seq_send() can't | |
607 | * handle odd lengths in non-linear skbs. | |
608 | * This will be the final fragment only. | |
609 | */ | |
610 | if (tlen % 4) | |
611 | using_sg = 0; | |
a7bbc7f4 VD |
612 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
613 | if (!fp) | |
614 | return -ENOMEM; | |
615 | ||
616 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
617 | fh_parm_offset = frame_offset; |
618 | fr_max_payload(fp) = fsp->max_payload; | |
619 | } | |
18fa11ef CL |
620 | |
621 | off = offset + sg->offset; | |
42e9a92f | 622 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
623 | sg_bytes = min(sg_bytes, |
624 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
625 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 626 | if (using_sg) { |
18fa11ef | 627 | get_page(page); |
42e9a92f RL |
628 | skb_fill_page_desc(fp_skb(fp), |
629 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 630 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
631 | fp_skb(fp)->data_len += sg_bytes; |
632 | fr_len(fp) += sg_bytes; | |
633 | fp_skb(fp)->truesize += PAGE_SIZE; | |
634 | } else { | |
42e9a92f RL |
635 | /* |
636 | * The scatterlist item may be bigger than PAGE_SIZE, | |
637 | * but we must not cross pages inside the kmap. | |
638 | */ | |
18fa11ef | 639 | page_addr = kmap_atomic(page, KM_SOFTIRQ0); |
42e9a92f RL |
640 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
641 | sg_bytes); | |
642 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
643 | data += sg_bytes; | |
644 | } | |
645 | offset += sg_bytes; | |
646 | frame_offset += sg_bytes; | |
647 | tlen -= sg_bytes; | |
648 | remaining -= sg_bytes; | |
649 | ||
d37322a4 YZ |
650 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
651 | (tlen)) | |
42e9a92f RL |
652 | continue; |
653 | ||
654 | /* | |
655 | * Send sequence with transfer sequence initiative in case | |
656 | * this is last FCP frame of the sequence. | |
657 | */ | |
658 | if (remaining == 0) | |
659 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
660 | ||
661 | ep = fc_seq_exch(seq); | |
662 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
663 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
664 | ||
665 | /* | |
666 | * send fragment using for a sequence. | |
667 | */ | |
3a3b42bf | 668 | error = lport->tt.seq_send(lport, seq, fp); |
42e9a92f RL |
669 | if (error) { |
670 | WARN_ON(1); /* send error should be rare */ | |
671 | fc_fcp_retry_cmd(fsp); | |
672 | return 0; | |
673 | } | |
674 | fp = NULL; | |
675 | } | |
676 | fsp->xfer_len += seq_blen; /* premature count? */ | |
677 | return 0; | |
678 | } | |
679 | ||
3a3b42bf RL |
680 | /** |
681 | * fc_fcp_abts_resp() - Send an ABTS response | |
682 | * @fsp: The FCP packet that is being aborted | |
683 | * @fp: The response frame | |
684 | */ | |
42e9a92f RL |
685 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
686 | { | |
687 | int ba_done = 1; | |
688 | struct fc_ba_rjt *brp; | |
689 | struct fc_frame_header *fh; | |
690 | ||
691 | fh = fc_frame_header_get(fp); | |
692 | switch (fh->fh_r_ctl) { | |
693 | case FC_RCTL_BA_ACC: | |
694 | break; | |
695 | case FC_RCTL_BA_RJT: | |
696 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
697 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
698 | break; | |
699 | /* fall thru */ | |
700 | default: | |
701 | /* | |
702 | * we will let the command timeout | |
703 | * and scsi-ml recover in this case, | |
704 | * therefore cleared the ba_done flag. | |
705 | */ | |
706 | ba_done = 0; | |
707 | } | |
708 | ||
709 | if (ba_done) { | |
710 | fsp->state |= FC_SRB_ABORTED; | |
711 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
712 | ||
713 | if (fsp->wait_for_comp) | |
714 | complete(&fsp->tm_done); | |
715 | else | |
716 | fc_fcp_complete_locked(fsp); | |
717 | } | |
718 | } | |
719 | ||
34f42a07 | 720 | /** |
3a3b42bf | 721 | * fc_fcp_recv() - Reveive an FCP frame |
34f42a07 | 722 | * @seq: The sequence the frame is on |
3a3b42bf | 723 | * @fp: The received frame |
34f42a07 | 724 | * @arg: The related FCP packet |
42e9a92f | 725 | * |
3a3b42bf RL |
726 | * Context: Called from Soft IRQ context. Can not be called |
727 | * holding the FCP packet list lock. | |
42e9a92f RL |
728 | */ |
729 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
730 | { | |
731 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 732 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
733 | struct fc_frame_header *fh; |
734 | struct fcp_txrdy *dd; | |
735 | u8 r_ctl; | |
736 | int rc = 0; | |
737 | ||
c46be11a VD |
738 | if (IS_ERR(fp)) { |
739 | fc_fcp_error(fsp, fp); | |
740 | return; | |
741 | } | |
42e9a92f RL |
742 | |
743 | fh = fc_frame_header_get(fp); | |
744 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 745 | |
1c4bfe63 | 746 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
747 | goto out; |
748 | if (fc_fcp_lock_pkt(fsp)) | |
749 | goto out; | |
750 | fsp->last_pkt_time = jiffies; | |
751 | ||
752 | if (fh->fh_type == FC_TYPE_BLS) { | |
753 | fc_fcp_abts_resp(fsp, fp); | |
754 | goto unlock; | |
755 | } | |
756 | ||
757 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
758 | goto unlock; | |
759 | ||
760 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
761 | /* | |
762 | * received XFER RDY from the target | |
763 | * need to send data to the target | |
764 | */ | |
765 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
766 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
767 | WARN_ON(!dd); | |
768 | ||
769 | rc = fc_fcp_send_data(fsp, seq, | |
770 | (size_t) ntohl(dd->ft_data_ro), | |
771 | (size_t) ntohl(dd->ft_burst_len)); | |
772 | if (!rc) | |
773 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
774 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
775 | /* | |
776 | * received a DATA frame | |
777 | * next we will copy the data to the system buffer | |
778 | */ | |
779 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
780 | fc_fcp_recv_data(fsp, fp); | |
781 | seq->rec_data = fsp->xfer_contig_end; | |
782 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
783 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
784 | ||
785 | fc_fcp_resp(fsp, fp); | |
786 | } else { | |
7414705e | 787 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
788 | } |
789 | unlock: | |
790 | fc_fcp_unlock_pkt(fsp); | |
791 | out: | |
792 | fc_frame_free(fp); | |
42e9a92f RL |
793 | } |
794 | ||
3a3b42bf RL |
795 | /** |
796 | * fc_fcp_resp() - Handler for FCP responses | |
797 | * @fsp: The FCP packet the response is for | |
798 | * @fp: The response frame | |
799 | */ | |
42e9a92f RL |
800 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
801 | { | |
802 | struct fc_frame_header *fh; | |
803 | struct fcp_resp *fc_rp; | |
804 | struct fcp_resp_ext *rp_ex; | |
805 | struct fcp_resp_rsp_info *fc_rp_info; | |
806 | u32 plen; | |
807 | u32 expected_len; | |
808 | u32 respl = 0; | |
809 | u32 snsl = 0; | |
810 | u8 flags = 0; | |
811 | ||
812 | plen = fr_len(fp); | |
813 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
814 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
815 | goto len_err; | |
816 | plen -= sizeof(*fh); | |
817 | fc_rp = (struct fcp_resp *)(fh + 1); | |
818 | fsp->cdb_status = fc_rp->fr_status; | |
819 | flags = fc_rp->fr_flags; | |
820 | fsp->scsi_comp_flags = flags; | |
821 | expected_len = fsp->data_len; | |
822 | ||
b277d2aa YZ |
823 | /* if ddp, update xfer len */ |
824 | fc_fcp_ddp_done(fsp); | |
825 | ||
42e9a92f RL |
826 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
827 | rp_ex = (void *)(fc_rp + 1); | |
828 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
829 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
830 | goto len_err; | |
831 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
832 | if (flags & FCP_RSP_LEN_VAL) { | |
833 | respl = ntohl(rp_ex->fr_rsp_len); | |
834 | if (respl != sizeof(*fc_rp_info)) | |
835 | goto len_err; | |
836 | if (fsp->wait_for_comp) { | |
837 | /* Abuse cdb_status for rsp code */ | |
838 | fsp->cdb_status = fc_rp_info->rsp_code; | |
839 | complete(&fsp->tm_done); | |
840 | /* | |
841 | * tmfs will not have any scsi cmd so | |
842 | * exit here | |
843 | */ | |
844 | return; | |
63ac4bbf | 845 | } |
42e9a92f RL |
846 | } |
847 | if (flags & FCP_SNS_LEN_VAL) { | |
848 | snsl = ntohl(rp_ex->fr_sns_len); | |
849 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
850 | snsl = SCSI_SENSE_BUFFERSIZE; | |
851 | memcpy(fsp->cmd->sense_buffer, | |
852 | (char *)fc_rp_info + respl, snsl); | |
853 | } | |
854 | } | |
855 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
856 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
857 | goto len_err; | |
858 | if (flags & FCP_RESID_UNDER) { | |
859 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
860 | /* | |
861 | * The cmnd->underflow is the minimum number of | |
862 | * bytes that must be transfered for this | |
863 | * command. Provided a sense condition is not | |
864 | * present, make sure the actual amount | |
865 | * transferred is at least the underflow value | |
866 | * or fail. | |
867 | */ | |
868 | if (!(flags & FCP_SNS_LEN_VAL) && | |
869 | (fc_rp->fr_status == 0) && | |
870 | (scsi_bufflen(fsp->cmd) - | |
871 | fsp->scsi_resid) < fsp->cmd->underflow) | |
872 | goto err; | |
873 | expected_len -= fsp->scsi_resid; | |
874 | } else { | |
875 | fsp->status_code = FC_ERROR; | |
876 | } | |
877 | } | |
878 | } | |
879 | fsp->state |= FC_SRB_RCV_STATUS; | |
880 | ||
881 | /* | |
882 | * Check for missing or extra data frames. | |
883 | */ | |
884 | if (unlikely(fsp->xfer_len != expected_len)) { | |
885 | if (fsp->xfer_len < expected_len) { | |
886 | /* | |
887 | * Some data may be queued locally, | |
888 | * Wait a at least one jiffy to see if it is delivered. | |
889 | * If this expires without data, we may do SRR. | |
890 | */ | |
891 | fc_fcp_timer_set(fsp, 2); | |
892 | return; | |
893 | } | |
894 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 895 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
896 | "len %x, data len %x\n", |
897 | fsp->rport->port_id, | |
898 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
899 | } |
900 | fc_fcp_complete_locked(fsp); | |
901 | return; | |
902 | ||
903 | len_err: | |
7414705e RL |
904 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
905 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
906 | err: |
907 | fsp->status_code = FC_ERROR; | |
908 | fc_fcp_complete_locked(fsp); | |
909 | } | |
910 | ||
911 | /** | |
3a3b42bf RL |
912 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
913 | * fcp_pkt lock held | |
914 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
915 | * |
916 | * This function may sleep if a timer is pending. The packet lock must be | |
917 | * held, and the host lock must not be held. | |
918 | */ | |
919 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
920 | { | |
3a3b42bf | 921 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
922 | struct fc_seq *seq; |
923 | struct fc_exch *ep; | |
924 | u32 f_ctl; | |
925 | ||
926 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
927 | return; | |
928 | ||
929 | if (fsp->state & FC_SRB_ABORTED) { | |
930 | if (!fsp->status_code) | |
931 | fsp->status_code = FC_CMD_ABORTED; | |
932 | } else { | |
933 | /* | |
934 | * Test for transport underrun, independent of response | |
935 | * underrun status. | |
936 | */ | |
937 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
938 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
939 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
940 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 941 | fsp->io_status = 0; |
42e9a92f RL |
942 | } |
943 | } | |
944 | ||
945 | seq = fsp->seq_ptr; | |
946 | if (seq) { | |
947 | fsp->seq_ptr = NULL; | |
948 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
949 | struct fc_frame *conf_frame; | |
950 | struct fc_seq *csp; | |
951 | ||
3a3b42bf | 952 | csp = lport->tt.seq_start_next(seq); |
c46be11a | 953 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
954 | if (conf_frame) { |
955 | f_ctl = FC_FC_SEQ_INIT; | |
956 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
957 | ep = fc_seq_exch(seq); | |
958 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
959 | ep->did, ep->sid, | |
960 | FC_TYPE_FCP, f_ctl, 0); | |
3a3b42bf | 961 | lport->tt.seq_send(lport, csp, conf_frame); |
42e9a92f RL |
962 | } |
963 | } | |
3a3b42bf | 964 | lport->tt.exch_done(seq); |
42e9a92f RL |
965 | } |
966 | fc_io_compl(fsp); | |
967 | } | |
968 | ||
3a3b42bf RL |
969 | /** |
970 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
971 | * @fsp: The FCP packet whose exchanges should be canceled | |
972 | * @error: The reason for the cancellation | |
973 | */ | |
42e9a92f RL |
974 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
975 | { | |
3a3b42bf | 976 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
977 | |
978 | if (fsp->seq_ptr) { | |
3a3b42bf | 979 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
980 | fsp->seq_ptr = NULL; |
981 | } | |
982 | fsp->status_code = error; | |
983 | } | |
984 | ||
985 | /** | |
3a3b42bf RL |
986 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
987 | * @lport: The local port whose exchanges should be canceled | |
988 | * @id: The target's ID | |
989 | * @lun: The LUN | |
990 | * @error: The reason for cancellation | |
42e9a92f RL |
991 | * |
992 | * If lun or id is -1, they are ignored. | |
993 | */ | |
3a3b42bf | 994 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
995 | unsigned int lun, int error) |
996 | { | |
3a3b42bf | 997 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
998 | struct fc_fcp_pkt *fsp; |
999 | struct scsi_cmnd *sc_cmd; | |
1000 | unsigned long flags; | |
1001 | ||
c1ecb90a | 1002 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1003 | restart: |
1004 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1005 | sc_cmd = fsp->cmd; | |
1006 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1007 | continue; | |
1008 | ||
1009 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1010 | continue; | |
1011 | ||
1012 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1013 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1014 | |
1015 | if (!fc_fcp_lock_pkt(fsp)) { | |
1016 | fc_fcp_cleanup_cmd(fsp, error); | |
1017 | fc_io_compl(fsp); | |
1018 | fc_fcp_unlock_pkt(fsp); | |
1019 | } | |
1020 | ||
1021 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1022 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1023 | /* |
1024 | * while we dropped the lock multiple pkts could | |
1025 | * have been released, so we have to start over. | |
1026 | */ | |
1027 | goto restart; | |
1028 | } | |
c1ecb90a | 1029 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1030 | } |
1031 | ||
3a3b42bf RL |
1032 | /** |
1033 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1034 | * @lport: The local port whose exchanges are to be aborted | |
1035 | */ | |
1036 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1037 | { |
3a3b42bf | 1038 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1039 | } |
1040 | ||
1041 | /** | |
3a3b42bf RL |
1042 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1043 | * @lport: The local port to send the FCP packet on | |
1044 | * @fsp: The FCP packet to send | |
42e9a92f | 1045 | * |
3a3b42bf | 1046 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1047 | * Locks: Called without locks held |
42e9a92f | 1048 | */ |
3a3b42bf | 1049 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1050 | { |
3a3b42bf | 1051 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1052 | unsigned long flags; |
42e9a92f RL |
1053 | int rc; |
1054 | ||
1055 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1056 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1057 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1058 | ||
1059 | int_to_scsilun(fsp->cmd->device->lun, | |
1060 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1061 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
42e9a92f | 1062 | |
c1ecb90a CL |
1063 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1064 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1065 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1066 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1067 | if (unlikely(rc)) { |
1068 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f | 1069 | list_del(&fsp->list); |
c1ecb90a CL |
1070 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1071 | } | |
42e9a92f RL |
1072 | |
1073 | return rc; | |
1074 | } | |
1075 | ||
3a3b42bf RL |
1076 | /** |
1077 | * fc_fcp_cmd_send() - Send a FCP command | |
1078 | * @lport: The local port to send the command on | |
1079 | * @fsp: The FCP packet the command is on | |
1080 | * @resp: The handler for the response | |
1081 | */ | |
1082 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1083 | void (*resp)(struct fc_seq *, |
1084 | struct fc_frame *fp, | |
1085 | void *arg)) | |
1086 | { | |
1087 | struct fc_frame *fp; | |
1088 | struct fc_seq *seq; | |
1089 | struct fc_rport *rport; | |
3a3b42bf | 1090 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1091 | const size_t len = sizeof(fsp->cdb_cmd); |
1092 | int rc = 0; | |
1093 | ||
1094 | if (fc_fcp_lock_pkt(fsp)) | |
1095 | return 0; | |
1096 | ||
c46be11a | 1097 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1098 | if (!fp) { |
1099 | rc = -1; | |
1100 | goto unlock; | |
1101 | } | |
1102 | ||
1103 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1104 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1105 | rport = fsp->rport; |
1106 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1107 | rpriv = rport->dd_data; |
42e9a92f RL |
1108 | |
1109 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
7b2787ec | 1110 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1111 | FC_FCTL_REQ, 0); |
42e9a92f | 1112 | |
3a3b42bf RL |
1113 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
1114 | fsp, 0); | |
42e9a92f | 1115 | if (!seq) { |
42e9a92f RL |
1116 | rc = -1; |
1117 | goto unlock; | |
1118 | } | |
1119 | fsp->last_pkt_time = jiffies; | |
1120 | fsp->seq_ptr = seq; | |
1121 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1122 | ||
1123 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); | |
1124 | fc_fcp_timer_set(fsp, | |
1125 | (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ? | |
1126 | FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT); | |
1127 | unlock: | |
1128 | fc_fcp_unlock_pkt(fsp); | |
1129 | return rc; | |
1130 | } | |
1131 | ||
3a3b42bf RL |
1132 | /** |
1133 | * fc_fcp_error() - Handler for FCP layer errors | |
1134 | * @fsp: The FCP packet the error is on | |
1135 | * @fp: The frame that has errored | |
42e9a92f RL |
1136 | */ |
1137 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1138 | { | |
1139 | int error = PTR_ERR(fp); | |
1140 | ||
1141 | if (fc_fcp_lock_pkt(fsp)) | |
1142 | return; | |
1143 | ||
7414705e | 1144 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1145 | fc_fcp_retry_cmd(fsp); |
1146 | goto unlock; | |
42e9a92f | 1147 | } |
7414705e | 1148 | |
42e9a92f RL |
1149 | /* |
1150 | * clear abort pending, because the lower layer | |
1151 | * decided to force completion. | |
1152 | */ | |
1153 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1154 | fsp->status_code = FC_CMD_PLOGO; | |
1155 | fc_fcp_complete_locked(fsp); | |
1156 | unlock: | |
1157 | fc_fcp_unlock_pkt(fsp); | |
1158 | } | |
1159 | ||
3a3b42bf RL |
1160 | /** |
1161 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1162 | * @fsp: The FCP packet to abort on | |
1163 | * | |
1164 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1165 | */ |
c340111d | 1166 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1167 | { |
1168 | int rc = FAILED; | |
1169 | ||
1170 | if (fc_fcp_send_abort(fsp)) | |
1171 | return FAILED; | |
1172 | ||
1173 | init_completion(&fsp->tm_done); | |
1174 | fsp->wait_for_comp = 1; | |
1175 | ||
1176 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1177 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1178 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1179 | fsp->wait_for_comp = 0; | |
1180 | ||
1181 | if (!rc) { | |
7414705e | 1182 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f RL |
1183 | rc = FAILED; |
1184 | } else if (fsp->state & FC_SRB_ABORTED) { | |
7414705e | 1185 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1186 | rc = SUCCESS; |
1187 | fc_fcp_complete_locked(fsp); | |
1188 | } | |
1189 | ||
1190 | return rc; | |
1191 | } | |
1192 | ||
3a3b42bf RL |
1193 | /** |
1194 | * fc_lun_reset_send() - Send LUN reset command | |
1195 | * @data: The FCP packet that identifies the LUN to be reset | |
42e9a92f RL |
1196 | */ |
1197 | static void fc_lun_reset_send(unsigned long data) | |
1198 | { | |
1199 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
3a3b42bf RL |
1200 | struct fc_lport *lport = fsp->lp; |
1201 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { | |
42e9a92f RL |
1202 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1203 | return; | |
1204 | if (fc_fcp_lock_pkt(fsp)) | |
1205 | return; | |
1206 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); | |
1207 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1208 | fc_fcp_unlock_pkt(fsp); | |
1209 | } | |
1210 | } | |
1211 | ||
3a3b42bf RL |
1212 | /** |
1213 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1214 | * and wait for the reply | |
b595076a | 1215 | * @lport: The local port to sent the command on |
3a3b42bf RL |
1216 | * @fsp: The FCP packet that identifies the LUN to be reset |
1217 | * @id: The SCSI command ID | |
1218 | * @lun: The LUN ID to be reset | |
42e9a92f | 1219 | */ |
3a3b42bf | 1220 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1221 | unsigned int id, unsigned int lun) |
1222 | { | |
1223 | int rc; | |
1224 | ||
1225 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1226 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1227 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1228 | ||
1229 | fsp->wait_for_comp = 1; | |
1230 | init_completion(&fsp->tm_done); | |
1231 | ||
1232 | fc_lun_reset_send((unsigned long)fsp); | |
1233 | ||
1234 | /* | |
1235 | * wait for completion of reset | |
1236 | * after that make sure all commands are terminated | |
1237 | */ | |
1238 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1239 | ||
1240 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1241 | fsp->state |= FC_SRB_COMPL; | |
1242 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1243 | ||
1244 | del_timer_sync(&fsp->timer); | |
1245 | ||
1246 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1247 | if (fsp->seq_ptr) { | |
3a3b42bf | 1248 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1249 | fsp->seq_ptr = NULL; |
1250 | } | |
1251 | fsp->wait_for_comp = 0; | |
1252 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1253 | ||
1254 | if (!rc) { | |
3a3b42bf | 1255 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1256 | return FAILED; |
1257 | } | |
1258 | ||
1259 | /* cdb_status holds the tmf's rsp code */ | |
1260 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1261 | return FAILED; | |
1262 | ||
3a3b42bf RL |
1263 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1264 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1265 | return SUCCESS; |
1266 | } | |
1267 | ||
3a3b42bf RL |
1268 | /** |
1269 | * fc_tm_done() - Task Managment response handler | |
1270 | * @seq: The sequence that the response is on | |
1271 | * @fp: The response frame | |
1272 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1273 | */ |
1274 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1275 | { | |
1276 | struct fc_fcp_pkt *fsp = arg; | |
1277 | struct fc_frame_header *fh; | |
1278 | ||
1279 | if (IS_ERR(fp)) { | |
1280 | /* | |
1281 | * If there is an error just let it timeout or wait | |
1282 | * for TMF to be aborted if it timedout. | |
1283 | * | |
1284 | * scsi-eh will escalate for when either happens. | |
1285 | */ | |
1286 | return; | |
1287 | } | |
1288 | ||
1289 | if (fc_fcp_lock_pkt(fsp)) | |
1290 | return; | |
1291 | ||
1292 | /* | |
1293 | * raced with eh timeout handler. | |
1294 | */ | |
1295 | if (!fsp->seq_ptr || !fsp->wait_for_comp) { | |
1296 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1297 | return; | |
1298 | } | |
1299 | ||
1300 | fh = fc_frame_header_get(fp); | |
1301 | if (fh->fh_type != FC_TYPE_BLS) | |
1302 | fc_fcp_resp(fsp, fp); | |
1303 | fsp->seq_ptr = NULL; | |
1304 | fsp->lp->tt.exch_done(seq); | |
1305 | fc_frame_free(fp); | |
1306 | fc_fcp_unlock_pkt(fsp); | |
1307 | } | |
1308 | ||
3a3b42bf RL |
1309 | /** |
1310 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1311 | * @lport: The local port to be cleaned up | |
1312 | */ | |
1313 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1314 | { |
3a3b42bf | 1315 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1316 | } |
1317 | ||
3a3b42bf RL |
1318 | /** |
1319 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
1320 | * @data: The FCP packet that has timed out | |
42e9a92f | 1321 | * |
3a3b42bf RL |
1322 | * If REC is supported then just issue it and return. The REC exchange will |
1323 | * complete or time out and recovery can continue at that point. Otherwise, | |
1324 | * if the response has been received without all the data it has been | |
1325 | * ER_TIMEOUT since the response was received. If the response has not been | |
1326 | * received we see if data was received recently. If it has been then we | |
1327 | * continue waiting, otherwise, we abort the command. | |
42e9a92f RL |
1328 | */ |
1329 | static void fc_fcp_timeout(unsigned long data) | |
1330 | { | |
1331 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1332 | struct fc_rport *rport = fsp->rport; | |
3a3b42bf | 1333 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1334 | |
1335 | if (fc_fcp_lock_pkt(fsp)) | |
1336 | return; | |
1337 | ||
1338 | if (fsp->cdb_cmd.fc_tm_flags) | |
1339 | goto unlock; | |
1340 | ||
1341 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1342 | ||
3a3b42bf | 1343 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
42e9a92f RL |
1344 | fc_fcp_rec(fsp); |
1345 | else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2), | |
1346 | jiffies)) | |
1347 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); | |
1348 | else if (fsp->state & FC_SRB_RCV_STATUS) | |
1349 | fc_fcp_complete_locked(fsp); | |
1350 | else | |
5c12c418 | 1351 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1352 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1353 | unlock: | |
1354 | fc_fcp_unlock_pkt(fsp); | |
1355 | } | |
1356 | ||
3a3b42bf RL |
1357 | /** |
1358 | * fc_fcp_rec() - Send a REC ELS request | |
1359 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1360 | */ |
1361 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1362 | { | |
3a3b42bf | 1363 | struct fc_lport *lport; |
42e9a92f RL |
1364 | struct fc_frame *fp; |
1365 | struct fc_rport *rport; | |
3a3b42bf | 1366 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1367 | |
3a3b42bf | 1368 | lport = fsp->lp; |
42e9a92f | 1369 | rport = fsp->rport; |
3a3b42bf RL |
1370 | rpriv = rport->dd_data; |
1371 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1372 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1373 | fsp->io_status = 0; |
42e9a92f RL |
1374 | fc_fcp_complete_locked(fsp); |
1375 | return; | |
1376 | } | |
c46be11a | 1377 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1378 | if (!fp) |
1379 | goto retry; | |
1380 | ||
1381 | fr_seq(fp) = fsp->seq_ptr; | |
1382 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
7b2787ec | 1383 | rpriv->local_port->port_id, FC_TYPE_ELS, |
24f089e2 | 1384 | FC_FCTL_REQ, 0); |
3a3b42bf RL |
1385 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1386 | fc_fcp_rec_resp, fsp, | |
1387 | jiffies_to_msecs(FC_SCSI_REC_TOV))) { | |
42e9a92f RL |
1388 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1389 | return; | |
1390 | } | |
42e9a92f RL |
1391 | retry: |
1392 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1393 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1394 | else | |
5c12c418 | 1395 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1396 | } |
1397 | ||
3a3b42bf RL |
1398 | /** |
1399 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1400 | * @seq: The sequence the response is on | |
1401 | * @fp: The response frame | |
1402 | * @arg: The FCP packet the response is on | |
1403 | * | |
1404 | * If the response is a reject then the scsi layer will handle | |
1405 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1406 | * set the timeout and return. If the I/O was completed then complete the | |
1407 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1408 | */ |
1409 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1410 | { | |
1411 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1412 | struct fc_els_rec_acc *recp; | |
1413 | struct fc_els_ls_rjt *rjt; | |
1414 | u32 e_stat; | |
1415 | u8 opcode; | |
1416 | u32 offset; | |
1417 | enum dma_data_direction data_dir; | |
1418 | enum fc_rctl r_ctl; | |
3a3b42bf | 1419 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1420 | |
1421 | if (IS_ERR(fp)) { | |
1422 | fc_fcp_rec_error(fsp, fp); | |
1423 | return; | |
1424 | } | |
1425 | ||
1426 | if (fc_fcp_lock_pkt(fsp)) | |
1427 | goto out; | |
1428 | ||
1429 | fsp->recov_retry = 0; | |
1430 | opcode = fc_frame_payload_op(fp); | |
1431 | if (opcode == ELS_LS_RJT) { | |
1432 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1433 | switch (rjt->er_reason) { | |
1434 | default: | |
7414705e RL |
1435 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1436 | "reason %d expl %d\n", | |
1437 | fsp->rport->port_id, rjt->er_reason, | |
1438 | rjt->er_explan); | |
42e9a92f RL |
1439 | /* fall through */ |
1440 | case ELS_RJT_UNSUP: | |
7414705e | 1441 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1442 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1443 | /* |
1444 | * if we do not spport RECs or got some bogus | |
1445 | * reason then resetup timer so we check for | |
1446 | * making progress. | |
1447 | */ | |
3a3b42bf | 1448 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1449 | fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT); |
1450 | break; | |
1451 | case ELS_RJT_LOGIC: | |
1452 | case ELS_RJT_UNAB: | |
1453 | /* | |
1454 | * If no data transfer, the command frame got dropped | |
1455 | * so we just retry. If data was transferred, we | |
1456 | * lost the response but the target has no record, | |
1457 | * so we abort and retry. | |
1458 | */ | |
1459 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1460 | fsp->xfer_len == 0) { | |
1461 | fc_fcp_retry_cmd(fsp); | |
1462 | break; | |
1463 | } | |
5c12c418 | 1464 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1465 | break; |
1466 | } | |
1467 | } else if (opcode == ELS_LS_ACC) { | |
1468 | if (fsp->state & FC_SRB_ABORTED) | |
1469 | goto unlock_out; | |
1470 | ||
1471 | data_dir = fsp->cmd->sc_data_direction; | |
1472 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1473 | offset = ntohl(recp->reca_fc4value); | |
1474 | e_stat = ntohl(recp->reca_e_stat); | |
1475 | ||
1476 | if (e_stat & ESB_ST_COMPLETE) { | |
1477 | ||
1478 | /* | |
1479 | * The exchange is complete. | |
1480 | * | |
1481 | * For output, we must've lost the response. | |
1482 | * For input, all data must've been sent. | |
1483 | * We lost may have lost the response | |
1484 | * (and a confirmation was requested) and maybe | |
1485 | * some data. | |
1486 | * | |
1487 | * If all data received, send SRR | |
1488 | * asking for response. If partial data received, | |
1489 | * or gaps, SRR requests data at start of gap. | |
1490 | * Recovery via SRR relies on in-order-delivery. | |
1491 | */ | |
1492 | if (data_dir == DMA_TO_DEVICE) { | |
1493 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1494 | } else if (fsp->xfer_contig_end == offset) { | |
1495 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1496 | } else { | |
1497 | offset = fsp->xfer_contig_end; | |
1498 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1499 | } | |
1500 | fc_fcp_srr(fsp, r_ctl, offset); | |
1501 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
1502 | ||
1503 | /* | |
1504 | * The remote port has the initiative, so just | |
1505 | * keep waiting for it to complete. | |
1506 | */ | |
1507 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1508 | } else { | |
1509 | ||
1510 | /* | |
1511 | * The exchange is incomplete, we have seq. initiative. | |
1512 | * Lost response with requested confirmation, | |
1513 | * lost confirmation, lost transfer ready or | |
1514 | * lost write data. | |
1515 | * | |
1516 | * For output, if not all data was received, ask | |
1517 | * for transfer ready to be repeated. | |
1518 | * | |
1519 | * If we received or sent all the data, send SRR to | |
1520 | * request response. | |
1521 | * | |
1522 | * If we lost a response, we may have lost some read | |
1523 | * data as well. | |
1524 | */ | |
1525 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1526 | if (data_dir == DMA_TO_DEVICE) { | |
1527 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1528 | if (offset < fsp->data_len) | |
1529 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1530 | } else if (offset == fsp->xfer_contig_end) { | |
1531 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1532 | } else if (fsp->xfer_contig_end < offset) { | |
1533 | offset = fsp->xfer_contig_end; | |
1534 | } | |
1535 | fc_fcp_srr(fsp, r_ctl, offset); | |
1536 | } | |
1537 | } | |
1538 | unlock_out: | |
1539 | fc_fcp_unlock_pkt(fsp); | |
1540 | out: | |
1541 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1542 | fc_frame_free(fp); | |
1543 | } | |
1544 | ||
3a3b42bf RL |
1545 | /** |
1546 | * fc_fcp_rec_error() - Handler for REC errors | |
1547 | * @fsp: The FCP packet the error is on | |
1548 | * @fp: The REC frame | |
42e9a92f RL |
1549 | */ |
1550 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1551 | { | |
1552 | int error = PTR_ERR(fp); | |
1553 | ||
1554 | if (fc_fcp_lock_pkt(fsp)) | |
1555 | goto out; | |
1556 | ||
1557 | switch (error) { | |
1558 | case -FC_EX_CLOSED: | |
1559 | fc_fcp_retry_cmd(fsp); | |
1560 | break; | |
1561 | ||
1562 | default: | |
ce8b5df0 | 1563 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1564 | fsp, fsp->rport->port_id, error); |
42e9a92f RL |
1565 | fsp->status_code = FC_CMD_PLOGO; |
1566 | /* fall through */ | |
1567 | ||
1568 | case -FC_EX_TIMEOUT: | |
1569 | /* | |
1570 | * Assume REC or LS_ACC was lost. | |
1571 | * The exchange manager will have aborted REC, so retry. | |
1572 | */ | |
ce8b5df0 | 1573 | FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", |
7414705e RL |
1574 | fsp->rport->port_id, error, fsp->recov_retry, |
1575 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1576 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1577 | fc_fcp_rec(fsp); | |
1578 | else | |
5c12c418 | 1579 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1580 | break; |
1581 | } | |
1582 | fc_fcp_unlock_pkt(fsp); | |
1583 | out: | |
1584 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1585 | } | |
1586 | ||
3a3b42bf | 1587 | /** |
5c12c418 VD |
1588 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1589 | * @fsp: The FCP pkt that needs to be aborted | |
42e9a92f | 1590 | */ |
5c12c418 | 1591 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp) |
42e9a92f | 1592 | { |
5c12c418 | 1593 | fsp->status_code = FC_CMD_RECOVERY; |
42e9a92f RL |
1594 | fsp->cdb_status = 0; |
1595 | fsp->io_status = 0; | |
1596 | /* | |
1597 | * if this fails then we let the scsi command timer fire and | |
1598 | * scsi-ml escalate. | |
1599 | */ | |
1600 | fc_fcp_send_abort(fsp); | |
1601 | } | |
1602 | ||
3a3b42bf RL |
1603 | /** |
1604 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1605 | * @fsp: The FCP packet the SRR is to be sent on | |
1606 | * @r_ctl: The R_CTL field for the SRR request | |
42e9a92f RL |
1607 | * This is called after receiving status but insufficient data, or |
1608 | * when expecting status but the request has timed out. | |
1609 | */ | |
1610 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1611 | { | |
3a3b42bf | 1612 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1613 | struct fc_rport *rport; |
3a3b42bf | 1614 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1615 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1616 | struct fc_seq *seq; | |
1617 | struct fcp_srr *srr; | |
1618 | struct fc_frame *fp; | |
1619 | u8 cdb_op; | |
1620 | ||
1621 | rport = fsp->rport; | |
3a3b42bf | 1622 | rpriv = rport->dd_data; |
42e9a92f RL |
1623 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; |
1624 | ||
3a3b42bf RL |
1625 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1626 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1627 | goto retry; /* shouldn't happen */ |
c46be11a | 1628 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1629 | if (!fp) |
1630 | goto retry; | |
1631 | ||
1632 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1633 | memset(srr, 0, sizeof(*srr)); | |
1634 | srr->srr_op = ELS_SRR; | |
1635 | srr->srr_ox_id = htons(ep->oxid); | |
1636 | srr->srr_rx_id = htons(ep->rxid); | |
1637 | srr->srr_r_ctl = r_ctl; | |
1638 | srr->srr_rel_off = htonl(offset); | |
1639 | ||
1640 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
7b2787ec | 1641 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1642 | FC_FCTL_REQ, 0); |
42e9a92f | 1643 | |
3a3b42bf RL |
1644 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, |
1645 | fsp, jiffies_to_msecs(FC_SCSI_REC_TOV)); | |
8f550f93 | 1646 | if (!seq) |
42e9a92f | 1647 | goto retry; |
8f550f93 | 1648 | |
42e9a92f RL |
1649 | fsp->recov_seq = seq; |
1650 | fsp->xfer_len = offset; | |
1651 | fsp->xfer_contig_end = offset; | |
1652 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1653 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1654 | return; | |
1655 | retry: | |
1656 | fc_fcp_retry_cmd(fsp); | |
1657 | } | |
1658 | ||
3a3b42bf RL |
1659 | /** |
1660 | * fc_fcp_srr_resp() - Handler for SRR response | |
1661 | * @seq: The sequence the SRR is on | |
1662 | * @fp: The SRR frame | |
1663 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1664 | */ |
1665 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1666 | { | |
1667 | struct fc_fcp_pkt *fsp = arg; | |
1668 | struct fc_frame_header *fh; | |
1669 | ||
1670 | if (IS_ERR(fp)) { | |
1671 | fc_fcp_srr_error(fsp, fp); | |
1672 | return; | |
1673 | } | |
1674 | ||
1675 | if (fc_fcp_lock_pkt(fsp)) | |
1676 | goto out; | |
1677 | ||
1678 | fh = fc_frame_header_get(fp); | |
1679 | /* | |
1680 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1681 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1682 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1683 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1684 | * an abort response though. | |
1685 | */ | |
1686 | if (fh->fh_type == FC_TYPE_BLS) { | |
1687 | fc_fcp_unlock_pkt(fsp); | |
1688 | return; | |
1689 | } | |
1690 | ||
1691 | fsp->recov_seq = NULL; | |
1692 | switch (fc_frame_payload_op(fp)) { | |
1693 | case ELS_LS_ACC: | |
1694 | fsp->recov_retry = 0; | |
1695 | fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV); | |
1696 | break; | |
1697 | case ELS_LS_RJT: | |
1698 | default: | |
5c12c418 | 1699 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1700 | break; |
1701 | } | |
1702 | fc_fcp_unlock_pkt(fsp); | |
1703 | fsp->lp->tt.exch_done(seq); | |
1704 | out: | |
1705 | fc_frame_free(fp); | |
1706 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1707 | } | |
1708 | ||
3a3b42bf RL |
1709 | /** |
1710 | * fc_fcp_srr_error() - Handler for SRR errors | |
1711 | * @fsp: The FCP packet that the SRR error is on | |
1712 | * @fp: The SRR frame | |
1713 | */ | |
42e9a92f RL |
1714 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1715 | { | |
1716 | if (fc_fcp_lock_pkt(fsp)) | |
1717 | goto out; | |
1718 | fsp->lp->tt.exch_done(fsp->recov_seq); | |
1719 | fsp->recov_seq = NULL; | |
1720 | switch (PTR_ERR(fp)) { | |
1721 | case -FC_EX_TIMEOUT: | |
1722 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1723 | fc_fcp_rec(fsp); | |
1724 | else | |
5c12c418 | 1725 | fc_fcp_recovery(fsp); |
42e9a92f RL |
1726 | break; |
1727 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1728 | /* fall through */ | |
1729 | default: | |
1730 | fc_fcp_retry_cmd(fsp); | |
1731 | break; | |
1732 | } | |
1733 | fc_fcp_unlock_pkt(fsp); | |
1734 | out: | |
1735 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1736 | } | |
1737 | ||
3a3b42bf RL |
1738 | /** |
1739 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1740 | * @lport: The local port to be checked | |
1741 | */ | |
1742 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1743 | { |
1744 | /* lock ? */ | |
3a3b42bf RL |
1745 | return (lport->state == LPORT_ST_READY) && |
1746 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1747 | } |
1748 | ||
1749 | /** | |
3a3b42bf RL |
1750 | * fc_queuecommand() - The queuecommand function of the SCSI template |
1751 | * @cmd: The scsi_cmnd to be executed | |
1752 | * @done: The callback function to be called when the scsi_cmnd is complete | |
42e9a92f | 1753 | * |
3a3b42bf RL |
1754 | * This is the i/o strategy routine, called by the SCSI layer. This routine |
1755 | * is called with the host_lock held. | |
42e9a92f RL |
1756 | */ |
1757 | int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) | |
1758 | { | |
3a3b42bf | 1759 | struct fc_lport *lport; |
42e9a92f RL |
1760 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1761 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1762 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1763 | int rval; |
1764 | int rc = 0; | |
1765 | struct fcoe_dev_stats *stats; | |
1766 | ||
3a3b42bf | 1767 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f RL |
1768 | |
1769 | rval = fc_remote_port_chkready(rport); | |
1770 | if (rval) { | |
1771 | sc_cmd->result = rval; | |
1772 | done(sc_cmd); | |
be948fc3 | 1773 | return 0; |
42e9a92f | 1774 | } |
be948fc3 | 1775 | spin_unlock_irq(lport->host->host_lock); |
42e9a92f RL |
1776 | |
1777 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1778 | /* | |
1779 | * rport is transitioning from blocked/deleted to | |
1780 | * online | |
1781 | */ | |
1782 | sc_cmd->result = DID_IMM_RETRY << 16; | |
1783 | done(sc_cmd); | |
1784 | goto out; | |
1785 | } | |
1786 | ||
3a3b42bf | 1787 | rpriv = rport->dd_data; |
42e9a92f | 1788 | |
3a3b42bf | 1789 | if (!fc_fcp_lport_queue_ready(lport)) { |
84c3e1ad VD |
1790 | if (lport->qfull) |
1791 | fc_fcp_can_queue_ramp_down(lport); | |
42e9a92f RL |
1792 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1793 | goto out; | |
1794 | } | |
1795 | ||
3a3b42bf | 1796 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1797 | if (fsp == NULL) { |
1798 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1799 | goto out; | |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * build the libfc request pkt | |
1804 | */ | |
1805 | fsp->cmd = sc_cmd; /* save the cmd */ | |
3a3b42bf | 1806 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f | 1807 | fsp->rport = rport; /* set the remote port ptr */ |
5e472d07 | 1808 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
1809 | sc_cmd->scsi_done = done; |
1810 | ||
1811 | /* | |
1812 | * set up the transfer length | |
1813 | */ | |
1814 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1815 | fsp->xfer_len = 0; | |
1816 | ||
1817 | /* | |
1818 | * setup the data direction | |
1819 | */ | |
f018b73a | 1820 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f RL |
1821 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1822 | fsp->req_flags = FC_SRB_READ; | |
1823 | stats->InputRequests++; | |
1824 | stats->InputMegabytes = fsp->data_len; | |
1825 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { | |
1826 | fsp->req_flags = FC_SRB_WRITE; | |
1827 | stats->OutputRequests++; | |
1828 | stats->OutputMegabytes = fsp->data_len; | |
1829 | } else { | |
1830 | fsp->req_flags = 0; | |
1831 | stats->ControlRequests++; | |
1832 | } | |
f018b73a | 1833 | put_cpu(); |
42e9a92f | 1834 | |
3a3b42bf | 1835 | fsp->tgt_flags = rpriv->flags; |
42e9a92f RL |
1836 | |
1837 | init_timer(&fsp->timer); | |
1838 | fsp->timer.data = (unsigned long)fsp; | |
1839 | ||
1840 | /* | |
1841 | * send it to the lower layer | |
1842 | * if we get -1 return then put the request in the pending | |
1843 | * queue. | |
1844 | */ | |
3a3b42bf | 1845 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1846 | if (rval != 0) { |
1847 | fsp->state = FC_SRB_FREE; | |
1848 | fc_fcp_pkt_release(fsp); | |
1849 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1850 | } | |
1851 | out: | |
c1ecb90a | 1852 | spin_lock_irq(lport->host->host_lock); |
42e9a92f RL |
1853 | return rc; |
1854 | } | |
1855 | EXPORT_SYMBOL(fc_queuecommand); | |
1856 | ||
1857 | /** | |
3a3b42bf RL |
1858 | * fc_io_compl() - Handle responses for completed commands |
1859 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1860 | * |
3a3b42bf | 1861 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1862 | * The fcp packet lock must be held when calling. |
1863 | */ | |
1864 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1865 | { | |
1866 | struct fc_fcp_internal *si; | |
1867 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1868 | struct fc_lport *lport; |
42e9a92f RL |
1869 | unsigned long flags; |
1870 | ||
b277d2aa YZ |
1871 | /* release outstanding ddp context */ |
1872 | fc_fcp_ddp_done(fsp); | |
1873 | ||
42e9a92f RL |
1874 | fsp->state |= FC_SRB_COMPL; |
1875 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1876 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1877 | del_timer_sync(&fsp->timer); | |
1878 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1879 | } | |
1880 | ||
3a3b42bf RL |
1881 | lport = fsp->lp; |
1882 | si = fc_get_scsi_internal(lport); | |
c1ecb90a | 1883 | if (!fsp->cmd) |
42e9a92f | 1884 | return; |
42e9a92f RL |
1885 | |
1886 | /* | |
84c3e1ad VD |
1887 | * if can_queue ramp down is done then try can_queue ramp up |
1888 | * since commands are completing now. | |
42e9a92f | 1889 | */ |
84c3e1ad VD |
1890 | if (si->last_can_queue_ramp_down_time) |
1891 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1892 | |
1893 | sc_cmd = fsp->cmd; | |
1894 | fsp->cmd = NULL; | |
1895 | ||
c1ecb90a | 1896 | if (!sc_cmd->SCp.ptr) |
42e9a92f | 1897 | return; |
42e9a92f RL |
1898 | |
1899 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; | |
1900 | switch (fsp->status_code) { | |
1901 | case FC_COMPLETE: | |
1902 | if (fsp->cdb_status == 0) { | |
1903 | /* | |
1904 | * good I/O status | |
1905 | */ | |
1906 | sc_cmd->result = DID_OK << 16; | |
1907 | if (fsp->scsi_resid) | |
1908 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1909 | } else { |
1910 | /* | |
1911 | * transport level I/O was ok but scsi | |
1912 | * has non zero status | |
1913 | */ | |
1914 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1915 | } | |
1916 | break; | |
1917 | case FC_ERROR: | |
b3ef990c RL |
1918 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1919 | "due to FC_ERROR\n"); | |
42e9a92f RL |
1920 | sc_cmd->result = DID_ERROR << 16; |
1921 | break; | |
1922 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1923 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1924 | /* |
1925 | * scsi status is good but transport level | |
26d9cab5 | 1926 | * underrun. |
42e9a92f | 1927 | */ |
b3ef990c RL |
1928 | if (fsp->state & FC_SRB_RCV_STATUS) { |
1929 | sc_cmd->result = DID_OK << 16; | |
1930 | } else { | |
1931 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
1932 | " due to FC_DATA_UNDRUN (trans)\n"); | |
1933 | sc_cmd->result = DID_ERROR << 16; | |
1934 | } | |
42e9a92f RL |
1935 | } else { |
1936 | /* | |
1937 | * scsi got underrun, this is an error | |
1938 | */ | |
b3ef990c RL |
1939 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1940 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
42e9a92f RL |
1941 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
1942 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1943 | } | |
1944 | break; | |
1945 | case FC_DATA_OVRRUN: | |
1946 | /* | |
1947 | * overrun is an error | |
1948 | */ | |
b3ef990c RL |
1949 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1950 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
1951 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
1952 | break; | |
1953 | case FC_CMD_ABORTED: | |
b3ef990c RL |
1954 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1955 | "due to FC_CMD_ABORTED\n"); | |
d5e6054a | 1956 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f | 1957 | break; |
5c12c418 | 1958 | case FC_CMD_RECOVERY: |
42e9a92f RL |
1959 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; |
1960 | break; | |
1961 | case FC_CMD_RESET: | |
1962 | sc_cmd->result = (DID_RESET << 16); | |
1963 | break; | |
1964 | case FC_HRD_ERROR: | |
1965 | sc_cmd->result = (DID_NO_CONNECT << 16); | |
1966 | break; | |
1967 | default: | |
b3ef990c RL |
1968 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1969 | "due to unknown error\n"); | |
42e9a92f RL |
1970 | sc_cmd->result = (DID_ERROR << 16); |
1971 | break; | |
1972 | } | |
1973 | ||
e0d93c5b VD |
1974 | if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) { |
1975 | sc_cmd->result = (DID_REQUEUE << 16); | |
1976 | FC_FCP_DBG(fsp, "Returning DID_REQUEUE to scsi-ml\n"); | |
1977 | } | |
1978 | ||
c1ecb90a | 1979 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f | 1980 | list_del(&fsp->list); |
c1ecb90a | 1981 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1982 | sc_cmd->SCp.ptr = NULL; |
1983 | sc_cmd->scsi_done(sc_cmd); | |
42e9a92f RL |
1984 | |
1985 | /* release ref from initial allocation in queue command */ | |
1986 | fc_fcp_pkt_release(fsp); | |
1987 | } | |
1988 | ||
42e9a92f | 1989 | /** |
34f42a07 | 1990 | * fc_eh_abort() - Abort a command |
3a3b42bf | 1991 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 1992 | * |
3a3b42bf RL |
1993 | * From SCSI host template. |
1994 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
1995 | */ |
1996 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
1997 | { | |
1998 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1999 | struct fc_lport *lport; |
42e9a92f RL |
2000 | int rc = FAILED; |
2001 | unsigned long flags; | |
2002 | ||
3a3b42bf RL |
2003 | lport = shost_priv(sc_cmd->device->host); |
2004 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2005 | return rc; |
3a3b42bf | 2006 | else if (!lport->link_up) |
42e9a92f RL |
2007 | return rc; |
2008 | ||
3a3b42bf | 2009 | spin_lock_irqsave(lport->host->host_lock, flags); |
42e9a92f RL |
2010 | fsp = CMD_SP(sc_cmd); |
2011 | if (!fsp) { | |
2012 | /* command completed while scsi eh was setting up */ | |
3a3b42bf | 2013 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
2014 | return SUCCESS; |
2015 | } | |
2016 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
2017 | fc_fcp_pkt_hold(fsp); | |
3a3b42bf | 2018 | spin_unlock_irqrestore(lport->host->host_lock, flags); |
42e9a92f RL |
2019 | |
2020 | if (fc_fcp_lock_pkt(fsp)) { | |
2021 | /* completed while we were waiting for timer to be deleted */ | |
2022 | rc = SUCCESS; | |
2023 | goto release_pkt; | |
2024 | } | |
2025 | ||
c340111d | 2026 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2027 | fc_fcp_unlock_pkt(fsp); |
2028 | ||
2029 | release_pkt: | |
2030 | fc_fcp_pkt_release(fsp); | |
2031 | return rc; | |
2032 | } | |
2033 | EXPORT_SYMBOL(fc_eh_abort); | |
2034 | ||
2035 | /** | |
3a3b42bf RL |
2036 | * fc_eh_device_reset() - Reset a single LUN |
2037 | * @sc_cmd: The SCSI command which identifies the device whose | |
2038 | * LUN is to be reset | |
42e9a92f | 2039 | * |
3a3b42bf | 2040 | * Set from SCSI host template. |
42e9a92f RL |
2041 | */ |
2042 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2043 | { | |
3a3b42bf | 2044 | struct fc_lport *lport; |
42e9a92f RL |
2045 | struct fc_fcp_pkt *fsp; |
2046 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2047 | int rc = FAILED; | |
42e9a92f RL |
2048 | int rval; |
2049 | ||
2050 | rval = fc_remote_port_chkready(rport); | |
2051 | if (rval) | |
2052 | goto out; | |
2053 | ||
3a3b42bf | 2054 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2055 | |
3a3b42bf | 2056 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2057 | return rc; |
2058 | ||
ce8b5df0 | 2059 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2060 | |
3a3b42bf | 2061 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2062 | if (fsp == NULL) { |
7414705e | 2063 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2064 | goto out; |
2065 | } | |
2066 | ||
2067 | /* | |
2068 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2069 | * the sc passed in is not setup for execution like when sent | |
2070 | * through the queuecommand callout. | |
2071 | */ | |
3a3b42bf | 2072 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f RL |
2073 | fsp->rport = rport; /* set the remote port ptr */ |
2074 | ||
2075 | /* | |
2076 | * flush outstanding commands | |
2077 | */ | |
3a3b42bf | 2078 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2079 | fsp->state = FC_SRB_FREE; |
2080 | fc_fcp_pkt_release(fsp); | |
2081 | ||
2082 | out: | |
2083 | return rc; | |
2084 | } | |
2085 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2086 | ||
2087 | /** | |
3a3b42bf RL |
2088 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2089 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2090 | */ |
2091 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2092 | { | |
2093 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2094 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2095 | unsigned long wait_tmo; |
2096 | ||
3a3b42bf | 2097 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2098 | |
3a3b42bf | 2099 | lport->tt.lport_reset(lport); |
42e9a92f | 2100 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2101 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2102 | wait_tmo)) | |
42e9a92f RL |
2103 | msleep(1000); |
2104 | ||
3a3b42bf | 2105 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2106 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
7b2787ec | 2107 | "on port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2108 | return SUCCESS; |
2109 | } else { | |
7414705e | 2110 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2111 | "port (%6.6x) is not ready.\n", |
7b2787ec | 2112 | lport->port_id); |
42e9a92f RL |
2113 | return FAILED; |
2114 | } | |
2115 | } | |
2116 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2117 | ||
2118 | /** | |
3a3b42bf RL |
2119 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2120 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2121 | * |
2122 | * Configures queue depth based on host's cmd_per_len. If not set | |
2123 | * then we use the libfc default. | |
2124 | */ | |
2125 | int fc_slave_alloc(struct scsi_device *sdev) | |
2126 | { | |
2127 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2128 | |
2129 | if (!rport || fc_remote_port_chkready(rport)) | |
2130 | return -ENXIO; | |
2131 | ||
14caf44c VD |
2132 | if (sdev->tagged_supported) |
2133 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2134 | else | |
2135 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2136 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2137 | ||
42e9a92f RL |
2138 | return 0; |
2139 | } | |
2140 | EXPORT_SYMBOL(fc_slave_alloc); | |
2141 | ||
3a3b42bf RL |
2142 | /** |
2143 | * fc_change_queue_depth() - Change a device's queue depth | |
2144 | * @sdev: The SCSI device whose queue depth is to change | |
2145 | * @qdepth: The new queue depth | |
2146 | * @reason: The resason for the change | |
2147 | */ | |
e881a172 | 2148 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2149 | { |
5c20848a MC |
2150 | switch (reason) { |
2151 | case SCSI_QDEPTH_DEFAULT: | |
2152 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2153 | break; | |
2154 | case SCSI_QDEPTH_QFULL: | |
2155 | scsi_track_queue_full(sdev, qdepth); | |
2156 | break; | |
229b8d72 VD |
2157 | case SCSI_QDEPTH_RAMP_UP: |
2158 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2159 | break; | |
5c20848a | 2160 | default: |
e881a172 | 2161 | return -EOPNOTSUPP; |
5c20848a | 2162 | } |
42e9a92f RL |
2163 | return sdev->queue_depth; |
2164 | } | |
2165 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2166 | ||
3a3b42bf RL |
2167 | /** |
2168 | * fc_change_queue_type() - Change a device's queue type | |
2169 | * @sdev: The SCSI device whose queue depth is to change | |
2170 | * @tag_type: Identifier for queue type | |
2171 | */ | |
42e9a92f RL |
2172 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
2173 | { | |
2174 | if (sdev->tagged_supported) { | |
2175 | scsi_set_tag_type(sdev, tag_type); | |
2176 | if (tag_type) | |
2177 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2178 | else | |
2179 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2180 | } else | |
2181 | tag_type = 0; | |
2182 | ||
2183 | return tag_type; | |
2184 | } | |
2185 | EXPORT_SYMBOL(fc_change_queue_type); | |
2186 | ||
3a3b42bf RL |
2187 | /** |
2188 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2189 | * @lport: The local port that no longer needs the FCP layer | |
2190 | */ | |
2191 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2192 | { |
3a3b42bf | 2193 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2194 | |
2195 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2196 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
7b2787ec | 2197 | "port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2198 | |
2199 | mempool_destroy(si->scsi_pkt_pool); | |
2200 | kfree(si); | |
3a3b42bf | 2201 | lport->scsi_priv = NULL; |
42e9a92f RL |
2202 | } |
2203 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2204 | ||
93e6d5ab RL |
2205 | int fc_setup_fcp() |
2206 | { | |
2207 | int rc = 0; | |
2208 | ||
2209 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2210 | sizeof(struct fc_fcp_pkt), | |
2211 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2212 | if (!scsi_pkt_cachep) { | |
2213 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2214 | "module load failed!"); | |
2215 | rc = -ENOMEM; | |
2216 | } | |
2217 | ||
2218 | return rc; | |
2219 | } | |
2220 | ||
2221 | void fc_destroy_fcp() | |
2222 | { | |
2223 | if (scsi_pkt_cachep) | |
2224 | kmem_cache_destroy(scsi_pkt_cachep); | |
2225 | } | |
2226 | ||
3a3b42bf RL |
2227 | /** |
2228 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2229 | * @lport: The local port to initialize the exchange layer for | |
2230 | */ | |
2231 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2232 | { |
2233 | int rc; | |
2234 | struct fc_fcp_internal *si; | |
2235 | ||
3a3b42bf RL |
2236 | if (!lport->tt.fcp_cmd_send) |
2237 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2238 | |
3a3b42bf RL |
2239 | if (!lport->tt.fcp_cleanup) |
2240 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2241 | |
3a3b42bf RL |
2242 | if (!lport->tt.fcp_abort_io) |
2243 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2244 | |
2245 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2246 | if (!si) | |
2247 | return -ENOMEM; | |
3a3b42bf | 2248 | lport->scsi_priv = si; |
84c3e1ad | 2249 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2250 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2251 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2252 | |
2253 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2254 | if (!si->scsi_pkt_pool) { | |
2255 | rc = -ENOMEM; | |
2256 | goto free_internal; | |
2257 | } | |
2258 | return 0; | |
2259 | ||
2260 | free_internal: | |
2261 | kfree(si); | |
2262 | return rc; | |
2263 | } | |
2264 | EXPORT_SYMBOL(fc_fcp_init); |