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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 | |
55204909 | 45 | static 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 | ||
e0883a3c | 60 | /* constant added to e_d_tov timeout to get rec_tov value */ |
61 | #define REC_TOV_CONST 1 | |
62 | ||
42e9a92f | 63 | /* |
8b7ac2bb | 64 | * The SCp.ptr should be tested and set under the scsi_pkt_queue lock |
42e9a92f RL |
65 | */ |
66 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) | |
67 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) | |
68 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) | |
69 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) | |
70 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) | |
71 | ||
3a3b42bf RL |
72 | /** |
73 | * struct fc_fcp_internal - FCP layer internal data | |
c1ecb90a CL |
74 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
75 | * @scsi_queue_lock: Protects the scsi_pkt_queue | |
3a3b42bf | 76 | * @scsi_pkt_queue: Current FCP packets |
84c3e1ad VD |
77 | * @last_can_queue_ramp_down_time: ramp down time |
78 | * @last_can_queue_ramp_up_time: ramp up time | |
79 | * @max_can_queue: max can_queue size | |
3a3b42bf | 80 | */ |
42e9a92f | 81 | struct fc_fcp_internal { |
c1ecb90a CL |
82 | mempool_t *scsi_pkt_pool; |
83 | spinlock_t scsi_queue_lock; | |
84 | struct list_head scsi_pkt_queue; | |
85 | unsigned long last_can_queue_ramp_down_time; | |
86 | unsigned long last_can_queue_ramp_up_time; | |
87 | int max_can_queue; | |
42e9a92f RL |
88 | }; |
89 | ||
90 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
91 | ||
92 | /* | |
93 | * function prototypes | |
94 | * FC scsi I/O related functions | |
95 | */ | |
96 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
97 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
98 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
99 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
100 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 101 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
ac17ea8d | 102 | static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); |
3a3b42bf | 103 | static void fc_fcp_timeout(unsigned long); |
42e9a92f RL |
104 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
105 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
106 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
107 | static void fc_io_compl(struct fc_fcp_pkt *); | |
108 | ||
109 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
110 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
111 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
112 | ||
113 | /* | |
114 | * command status codes | |
115 | */ | |
116 | #define FC_COMPLETE 0 | |
117 | #define FC_CMD_ABORTED 1 | |
118 | #define FC_CMD_RESET 2 | |
119 | #define FC_CMD_PLOGO 3 | |
120 | #define FC_SNS_RCV 4 | |
121 | #define FC_TRANS_ERR 5 | |
122 | #define FC_DATA_OVRRUN 6 | |
123 | #define FC_DATA_UNDRUN 7 | |
124 | #define FC_ERROR 8 | |
125 | #define FC_HRD_ERROR 9 | |
ac17ea8d | 126 | #define FC_CRC_ERROR 10 |
127 | #define FC_TIMED_OUT 11 | |
42e9a92f RL |
128 | |
129 | /* | |
130 | * Error recovery timeout values. | |
131 | */ | |
42e9a92f | 132 | #define FC_SCSI_TM_TOV (10 * HZ) |
42e9a92f | 133 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
84c3e1ad | 134 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
42e9a92f RL |
135 | |
136 | #define FC_MAX_ERROR_CNT 5 | |
137 | #define FC_MAX_RECOV_RETRY 3 | |
138 | ||
139 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
140 | ||
141 | /** | |
3a3b42bf RL |
142 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
143 | * @lport: The local port that the FCP packet is for | |
144 | * @gfp: GFP flags for allocation | |
42e9a92f | 145 | * |
3a3b42bf RL |
146 | * Return value: fcp_pkt structure or null on allocation failure. |
147 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 148 | */ |
3a3b42bf | 149 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 150 | { |
3a3b42bf | 151 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
152 | struct fc_fcp_pkt *fsp; |
153 | ||
154 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
155 | if (fsp) { | |
156 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 157 | fsp->lp = lport; |
f56635a8 | 158 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
159 | atomic_set(&fsp->ref_cnt, 1); |
160 | init_timer(&fsp->timer); | |
161 | INIT_LIST_HEAD(&fsp->list); | |
162 | spin_lock_init(&fsp->scsi_pkt_lock); | |
163 | } | |
164 | return fsp; | |
165 | } | |
166 | ||
167 | /** | |
3a3b42bf RL |
168 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
169 | * @fsp: The FCP packet to be released | |
42e9a92f | 170 | * |
3a3b42bf RL |
171 | * Context: Can be called from process or interrupt context, |
172 | * no lock is required. | |
42e9a92f RL |
173 | */ |
174 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
175 | { | |
176 | if (atomic_dec_and_test(&fsp->ref_cnt)) { | |
177 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); | |
178 | ||
179 | mempool_free(fsp, si->scsi_pkt_pool); | |
180 | } | |
181 | } | |
182 | ||
3a3b42bf RL |
183 | /** |
184 | * fc_fcp_pkt_hold() - Hold a fcp_pkt | |
185 | * @fsp: The FCP packet to be held | |
186 | */ | |
42e9a92f RL |
187 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
188 | { | |
189 | atomic_inc(&fsp->ref_cnt); | |
190 | } | |
191 | ||
192 | /** | |
3a3b42bf RL |
193 | * fc_fcp_pkt_destory() - Release hold on a fcp_pkt |
194 | * @seq: The sequence that the FCP packet is on (required by destructor API) | |
195 | * @fsp: The FCP packet to be released | |
196 | * | |
197 | * This routine is called by a destructor callback in the exch_seq_send() | |
198 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required | |
199 | * argument even though it is not used by this routine. | |
42e9a92f | 200 | * |
3a3b42bf | 201 | * Context: No locking required. |
42e9a92f RL |
202 | */ |
203 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
204 | { | |
205 | fc_fcp_pkt_release(fsp); | |
206 | } | |
207 | ||
208 | /** | |
3a3b42bf RL |
209 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
210 | * @fsp: The FCP packet to be locked and incremented | |
42e9a92f | 211 | * |
3a3b42bf | 212 | * We should only return error if we return a command to SCSI-ml before |
42e9a92f RL |
213 | * getting a response. This can happen in cases where we send a abort, but |
214 | * do not wait for the response and the abort and command can be passing | |
215 | * each other on the wire/network-layer. | |
216 | * | |
217 | * Note: this function locks the packet and gets a reference to allow | |
218 | * callers to call the completion function while the lock is held and | |
219 | * not have to worry about the packets refcount. | |
220 | * | |
221 | * TODO: Maybe we should just have callers grab/release the lock and | |
222 | * have a function that they call to verify the fsp and grab a ref if | |
223 | * needed. | |
224 | */ | |
225 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
226 | { | |
227 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
228 | if (fsp->state & FC_SRB_COMPL) { | |
229 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
230 | return -EPERM; | |
231 | } | |
232 | ||
233 | fc_fcp_pkt_hold(fsp); | |
234 | return 0; | |
235 | } | |
236 | ||
3a3b42bf RL |
237 | /** |
238 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its | |
239 | * reference count | |
240 | * @fsp: The FCP packet to be unlocked and decremented | |
241 | */ | |
42e9a92f RL |
242 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
243 | { | |
244 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
245 | fc_fcp_pkt_release(fsp); | |
246 | } | |
247 | ||
3a3b42bf RL |
248 | /** |
249 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt | |
250 | * @fsp: The FCP packet to start a timer for | |
251 | * @delay: The timeout period for the timer | |
252 | */ | |
42e9a92f RL |
253 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
254 | { | |
255 | if (!(fsp->state & FC_SRB_COMPL)) | |
256 | mod_timer(&fsp->timer, jiffies + delay); | |
257 | } | |
258 | ||
3a3b42bf RL |
259 | /** |
260 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a | |
261 | * fcp_pkt | |
262 | * @fsp: The FCP packet to abort exchanges on | |
263 | */ | |
42e9a92f RL |
264 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
265 | { | |
266 | if (!fsp->seq_ptr) | |
267 | return -EINVAL; | |
268 | ||
269 | fsp->state |= FC_SRB_ABORT_PENDING; | |
270 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); | |
271 | } | |
272 | ||
3a3b42bf RL |
273 | /** |
274 | * fc_fcp_retry_cmd() - Retry a fcp_pkt | |
275 | * @fsp: The FCP packet to be retried | |
276 | * | |
277 | * Sets the status code to be FC_ERROR and then calls | |
278 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). | |
279 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. | |
280 | * The SCSI-ml will retry the command. | |
42e9a92f RL |
281 | */ |
282 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) | |
283 | { | |
284 | if (fsp->seq_ptr) { | |
285 | fsp->lp->tt.exch_done(fsp->seq_ptr); | |
286 | fsp->seq_ptr = NULL; | |
287 | } | |
288 | ||
289 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 290 | fsp->io_status = 0; |
42e9a92f RL |
291 | fsp->status_code = FC_ERROR; |
292 | fc_fcp_complete_locked(fsp); | |
293 | } | |
294 | ||
3a3b42bf RL |
295 | /** |
296 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context | |
297 | * @fsp: The FCP packet that will manage the DDP frames | |
298 | * @xid: The XID that will be used for the DDP exchange | |
b277d2aa YZ |
299 | */ |
300 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
301 | { | |
3a3b42bf | 302 | struct fc_lport *lport; |
b277d2aa | 303 | |
3a3b42bf | 304 | lport = fsp->lp; |
b277d2aa | 305 | if ((fsp->req_flags & FC_SRB_READ) && |
3a3b42bf RL |
306 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
307 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), | |
308 | scsi_sg_count(fsp->cmd))) | |
b277d2aa YZ |
309 | fsp->xfer_ddp = xid; |
310 | } | |
311 | } | |
b277d2aa | 312 | |
3a3b42bf RL |
313 | /** |
314 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any | |
315 | * DDP related resources for a fcp_pkt | |
316 | * @fsp: The FCP packet that DDP had been used on | |
b277d2aa YZ |
317 | */ |
318 | static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) | |
319 | { | |
3a3b42bf | 320 | struct fc_lport *lport; |
b277d2aa YZ |
321 | |
322 | if (!fsp) | |
323 | return; | |
324 | ||
5e472d07 YZ |
325 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
326 | return; | |
327 | ||
3a3b42bf RL |
328 | lport = fsp->lp; |
329 | if (lport->tt.ddp_done) { | |
330 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); | |
5e472d07 | 331 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
332 | } |
333 | } | |
334 | ||
84c3e1ad VD |
335 | /** |
336 | * fc_fcp_can_queue_ramp_up() - increases can_queue | |
337 | * @lport: lport to ramp up can_queue | |
338 | * | |
339 | * Locking notes: Called with Scsi_Host lock held | |
340 | */ | |
341 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) | |
342 | { | |
343 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
344 | int can_queue; | |
345 | ||
346 | if (si->last_can_queue_ramp_up_time && | |
347 | (time_before(jiffies, si->last_can_queue_ramp_up_time + | |
348 | FC_CAN_QUEUE_PERIOD))) | |
349 | return; | |
350 | ||
351 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
352 | FC_CAN_QUEUE_PERIOD)) | |
353 | return; | |
354 | ||
355 | si->last_can_queue_ramp_up_time = jiffies; | |
356 | ||
357 | can_queue = lport->host->can_queue << 1; | |
358 | if (can_queue >= si->max_can_queue) { | |
359 | can_queue = si->max_can_queue; | |
360 | si->last_can_queue_ramp_down_time = 0; | |
361 | } | |
362 | lport->host->can_queue = can_queue; | |
363 | shost_printk(KERN_ERR, lport->host, "libfc: increased " | |
364 | "can_queue to %d.\n", can_queue); | |
365 | } | |
366 | ||
c46be11a VD |
367 | /** |
368 | * fc_fcp_can_queue_ramp_down() - reduces can_queue | |
369 | * @lport: lport to reduce can_queue | |
370 | * | |
371 | * If we are getting memory allocation failures, then we may | |
372 | * be trying to execute too many commands. We let the running | |
373 | * commands complete or timeout, then try again with a reduced | |
374 | * can_queue. Eventually we will hit the point where we run | |
375 | * on all reserved structs. | |
84c3e1ad VD |
376 | * |
377 | * Locking notes: Called with Scsi_Host lock held | |
c46be11a VD |
378 | */ |
379 | static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) | |
380 | { | |
381 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
c46be11a VD |
382 | int can_queue; |
383 | ||
84c3e1ad VD |
384 | if (si->last_can_queue_ramp_down_time && |
385 | (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
386 | FC_CAN_QUEUE_PERIOD))) | |
387 | return; | |
388 | ||
389 | si->last_can_queue_ramp_down_time = jiffies; | |
c46be11a VD |
390 | |
391 | can_queue = lport->host->can_queue; | |
392 | can_queue >>= 1; | |
393 | if (!can_queue) | |
394 | can_queue = 1; | |
395 | lport->host->can_queue = can_queue; | |
396 | shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" | |
397 | "Reducing can_queue to %d.\n", can_queue); | |
c46be11a VD |
398 | } |
399 | ||
400 | /* | |
401 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. | |
402 | * @lport: fc lport struct | |
403 | * @len: payload length | |
404 | * | |
405 | * Allocates fc_frame structure and buffer but if fails to allocate | |
406 | * then reduce can_queue. | |
407 | */ | |
408 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, | |
409 | size_t len) | |
410 | { | |
411 | struct fc_frame *fp; | |
84c3e1ad | 412 | unsigned long flags; |
c46be11a VD |
413 | |
414 | fp = fc_frame_alloc(lport, len); | |
c1ecb90a CL |
415 | if (likely(fp)) |
416 | return fp; | |
417 | ||
418 | /* error case */ | |
419 | spin_lock_irqsave(lport->host->host_lock, flags); | |
420 | fc_fcp_can_queue_ramp_down(lport); | |
421 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
422 | return NULL; | |
c46be11a VD |
423 | } |
424 | ||
3a3b42bf RL |
425 | /** |
426 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
427 | * @fsp: The FCP packet the data is on | |
428 | * @fp: The data frame | |
42e9a92f RL |
429 | */ |
430 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
431 | { | |
432 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 433 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
434 | struct fcoe_dev_stats *stats; |
435 | struct fc_frame_header *fh; | |
436 | size_t start_offset; | |
437 | size_t offset; | |
438 | u32 crc; | |
439 | u32 copy_len = 0; | |
440 | size_t len; | |
441 | void *buf; | |
442 | struct scatterlist *sg; | |
58682874 | 443 | u32 nents; |
ac17ea8d | 444 | u8 host_bcode = FC_COMPLETE; |
42e9a92f RL |
445 | |
446 | fh = fc_frame_header_get(fp); | |
447 | offset = ntohl(fh->fh_parm_offset); | |
448 | start_offset = offset; | |
449 | len = fr_len(fp) - sizeof(*fh); | |
450 | buf = fc_frame_payload_get(fp, 0); | |
451 | ||
5c12c418 | 452 | /* |
ac17ea8d | 453 | * if this I/O is ddped then clear it and initiate recovery since data |
454 | * frames are expected to be placed directly in that case. | |
455 | * | |
456 | * Indicate error to scsi-ml because something went wrong with the | |
457 | * ddp handling to get us here. | |
5c12c418 VD |
458 | */ |
459 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { | |
460 | fc_fcp_ddp_done(fsp); | |
ac17ea8d | 461 | FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); |
462 | host_bcode = FC_ERROR; | |
5c12c418 VD |
463 | goto err; |
464 | } | |
42e9a92f | 465 | if (offset + len > fsp->data_len) { |
34f42a07 | 466 | /* this should never happen */ |
42e9a92f RL |
467 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
468 | fc_frame_crc_check(fp)) | |
469 | goto crc_err; | |
7414705e RL |
470 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
471 | "data_len %x\n", len, offset, fsp->data_len); | |
ac17ea8d | 472 | |
473 | /* Data is corrupted indicate scsi-ml should retry */ | |
474 | host_bcode = FC_DATA_OVRRUN; | |
5c12c418 | 475 | goto err; |
42e9a92f RL |
476 | } |
477 | if (offset != fsp->xfer_len) | |
478 | fsp->state |= FC_SRB_DISCONTIG; | |
479 | ||
42e9a92f | 480 | sg = scsi_sglist(sc); |
58682874 | 481 | nents = scsi_sg_count(sc); |
42e9a92f | 482 | |
58682874 RL |
483 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
484 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
485 | &offset, KM_SOFTIRQ0, NULL); | |
486 | } else { | |
487 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
488 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
489 | &offset, KM_SOFTIRQ0, &crc); | |
42e9a92f | 490 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 491 | if (len % 4) |
42e9a92f | 492 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
493 | |
494 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
495 | crc_err: | |
f018b73a | 496 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f | 497 | stats->ErrorFrames++; |
f018b73a | 498 | /* per cpu count, not total count, but OK for limit */ |
42e9a92f | 499 | if (stats->InvalidCRCCount++ < 5) |
7414705e | 500 | printk(KERN_WARNING "libfc: CRC error on data " |
ce8b5df0 | 501 | "frame for port (%6.6x)\n", |
7b2787ec | 502 | lport->port_id); |
f018b73a | 503 | put_cpu(); |
42e9a92f RL |
504 | /* |
505 | * Assume the frame is total garbage. | |
506 | * We may have copied it over the good part | |
507 | * of the buffer. | |
508 | * If so, we need to retry the entire operation. | |
509 | * Otherwise, ignore it. | |
510 | */ | |
ac17ea8d | 511 | if (fsp->state & FC_SRB_DISCONTIG) { |
512 | host_bcode = FC_CRC_ERROR; | |
5c12c418 | 513 | goto err; |
ac17ea8d | 514 | } |
42e9a92f RL |
515 | return; |
516 | } | |
517 | } | |
518 | ||
519 | if (fsp->xfer_contig_end == start_offset) | |
520 | fsp->xfer_contig_end += copy_len; | |
521 | fsp->xfer_len += copy_len; | |
522 | ||
523 | /* | |
524 | * In the very rare event that this data arrived after the response | |
525 | * and completes the transfer, call the completion handler. | |
526 | */ | |
527 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
528 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
529 | fc_fcp_complete_locked(fsp); | |
5c12c418 VD |
530 | return; |
531 | err: | |
ac17ea8d | 532 | fc_fcp_recovery(fsp, host_bcode); |
42e9a92f RL |
533 | } |
534 | ||
34f42a07 | 535 | /** |
3a3b42bf RL |
536 | * fc_fcp_send_data() - Send SCSI data to a target |
537 | * @fsp: The FCP packet the data is on | |
538 | * @sp: The sequence the data is to be sent on | |
539 | * @offset: The starting offset for this data request | |
540 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
541 | * |
542 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf | 543 | * If the LLD is capable of sequence offload then send down the |
9ddc5b6f | 544 | * seq_blen amount of data in single frame, otherwise send |
3a3b42bf RL |
545 | * multiple frames of the maximum frame payload supported by |
546 | * the target port. | |
42e9a92f RL |
547 | */ |
548 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
549 | size_t offset, size_t seq_blen) | |
550 | { | |
551 | struct fc_exch *ep; | |
552 | struct scsi_cmnd *sc; | |
553 | struct scatterlist *sg; | |
554 | struct fc_frame *fp = NULL; | |
3a3b42bf | 555 | struct fc_lport *lport = fsp->lp; |
18fa11ef | 556 | struct page *page; |
42e9a92f RL |
557 | size_t remaining; |
558 | size_t t_blen; | |
559 | size_t tlen; | |
560 | size_t sg_bytes; | |
561 | size_t frame_offset, fh_parm_offset; | |
18fa11ef | 562 | size_t off; |
42e9a92f RL |
563 | int error; |
564 | void *data = NULL; | |
565 | void *page_addr; | |
3a3b42bf | 566 | int using_sg = lport->sg_supp; |
42e9a92f RL |
567 | u32 f_ctl; |
568 | ||
569 | WARN_ON(seq_blen <= 0); | |
570 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
571 | /* this should never happen */ | |
7414705e RL |
572 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
573 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
574 | fc_fcp_send_abort(fsp); |
575 | return 0; | |
576 | } else if (offset != fsp->xfer_len) { | |
577 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
578 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
579 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
580 | } |
581 | ||
582 | /* | |
583 | * if LLD is capable of seq_offload then set transport | |
584 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
585 | * to max FC frame payload previously set in fsp->max_payload. | |
586 | */ | |
276d6814 | 587 | t_blen = fsp->max_payload; |
3a3b42bf RL |
588 | if (lport->seq_offload) { |
589 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 590 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 591 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
592 | } |
593 | ||
42e9a92f RL |
594 | if (t_blen > 512) |
595 | t_blen &= ~(512 - 1); /* round down to block size */ | |
42e9a92f RL |
596 | sc = fsp->cmd; |
597 | ||
598 | remaining = seq_blen; | |
599 | fh_parm_offset = frame_offset = offset; | |
600 | tlen = 0; | |
3a3b42bf | 601 | seq = lport->tt.seq_start_next(seq); |
42e9a92f RL |
602 | f_ctl = FC_FC_REL_OFF; |
603 | WARN_ON(!seq); | |
604 | ||
42e9a92f RL |
605 | sg = scsi_sglist(sc); |
606 | ||
607 | while (remaining > 0 && sg) { | |
608 | if (offset >= sg->length) { | |
609 | offset -= sg->length; | |
610 | sg = sg_next(sg); | |
611 | continue; | |
612 | } | |
613 | if (!fp) { | |
614 | tlen = min(t_blen, remaining); | |
615 | ||
616 | /* | |
617 | * TODO. Temporary workaround. fc_seq_send() can't | |
618 | * handle odd lengths in non-linear skbs. | |
619 | * This will be the final fragment only. | |
620 | */ | |
621 | if (tlen % 4) | |
622 | using_sg = 0; | |
a7bbc7f4 VD |
623 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
624 | if (!fp) | |
625 | return -ENOMEM; | |
626 | ||
627 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
628 | fh_parm_offset = frame_offset; |
629 | fr_max_payload(fp) = fsp->max_payload; | |
630 | } | |
18fa11ef CL |
631 | |
632 | off = offset + sg->offset; | |
42e9a92f | 633 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
634 | sg_bytes = min(sg_bytes, |
635 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
636 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 637 | if (using_sg) { |
18fa11ef | 638 | get_page(page); |
42e9a92f RL |
639 | skb_fill_page_desc(fp_skb(fp), |
640 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 641 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
642 | fp_skb(fp)->data_len += sg_bytes; |
643 | fr_len(fp) += sg_bytes; | |
644 | fp_skb(fp)->truesize += PAGE_SIZE; | |
645 | } else { | |
42e9a92f RL |
646 | /* |
647 | * The scatterlist item may be bigger than PAGE_SIZE, | |
648 | * but we must not cross pages inside the kmap. | |
649 | */ | |
18fa11ef | 650 | page_addr = kmap_atomic(page, KM_SOFTIRQ0); |
42e9a92f RL |
651 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
652 | sg_bytes); | |
653 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
654 | data += sg_bytes; | |
655 | } | |
656 | offset += sg_bytes; | |
657 | frame_offset += sg_bytes; | |
658 | tlen -= sg_bytes; | |
659 | remaining -= sg_bytes; | |
660 | ||
d37322a4 YZ |
661 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
662 | (tlen)) | |
42e9a92f RL |
663 | continue; |
664 | ||
665 | /* | |
666 | * Send sequence with transfer sequence initiative in case | |
667 | * this is last FCP frame of the sequence. | |
668 | */ | |
669 | if (remaining == 0) | |
670 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
671 | ||
672 | ep = fc_seq_exch(seq); | |
673 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
674 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
675 | ||
676 | /* | |
677 | * send fragment using for a sequence. | |
678 | */ | |
3a3b42bf | 679 | error = lport->tt.seq_send(lport, seq, fp); |
42e9a92f RL |
680 | if (error) { |
681 | WARN_ON(1); /* send error should be rare */ | |
682 | fc_fcp_retry_cmd(fsp); | |
683 | return 0; | |
684 | } | |
685 | fp = NULL; | |
686 | } | |
687 | fsp->xfer_len += seq_blen; /* premature count? */ | |
688 | return 0; | |
689 | } | |
690 | ||
3a3b42bf RL |
691 | /** |
692 | * fc_fcp_abts_resp() - Send an ABTS response | |
693 | * @fsp: The FCP packet that is being aborted | |
694 | * @fp: The response frame | |
695 | */ | |
42e9a92f RL |
696 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
697 | { | |
698 | int ba_done = 1; | |
699 | struct fc_ba_rjt *brp; | |
700 | struct fc_frame_header *fh; | |
701 | ||
702 | fh = fc_frame_header_get(fp); | |
703 | switch (fh->fh_r_ctl) { | |
704 | case FC_RCTL_BA_ACC: | |
705 | break; | |
706 | case FC_RCTL_BA_RJT: | |
707 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
708 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
709 | break; | |
710 | /* fall thru */ | |
711 | default: | |
712 | /* | |
713 | * we will let the command timeout | |
714 | * and scsi-ml recover in this case, | |
715 | * therefore cleared the ba_done flag. | |
716 | */ | |
717 | ba_done = 0; | |
718 | } | |
719 | ||
720 | if (ba_done) { | |
721 | fsp->state |= FC_SRB_ABORTED; | |
722 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
723 | ||
724 | if (fsp->wait_for_comp) | |
725 | complete(&fsp->tm_done); | |
726 | else | |
727 | fc_fcp_complete_locked(fsp); | |
728 | } | |
729 | } | |
730 | ||
34f42a07 | 731 | /** |
3a3b42bf | 732 | * fc_fcp_recv() - Reveive an FCP frame |
34f42a07 | 733 | * @seq: The sequence the frame is on |
3a3b42bf | 734 | * @fp: The received frame |
34f42a07 | 735 | * @arg: The related FCP packet |
42e9a92f | 736 | * |
3a3b42bf RL |
737 | * Context: Called from Soft IRQ context. Can not be called |
738 | * holding the FCP packet list lock. | |
42e9a92f RL |
739 | */ |
740 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
741 | { | |
742 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 743 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
744 | struct fc_frame_header *fh; |
745 | struct fcp_txrdy *dd; | |
746 | u8 r_ctl; | |
747 | int rc = 0; | |
748 | ||
c46be11a VD |
749 | if (IS_ERR(fp)) { |
750 | fc_fcp_error(fsp, fp); | |
751 | return; | |
752 | } | |
42e9a92f RL |
753 | |
754 | fh = fc_frame_header_get(fp); | |
755 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 756 | |
1c4bfe63 | 757 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
758 | goto out; |
759 | if (fc_fcp_lock_pkt(fsp)) | |
760 | goto out; | |
761 | fsp->last_pkt_time = jiffies; | |
762 | ||
763 | if (fh->fh_type == FC_TYPE_BLS) { | |
764 | fc_fcp_abts_resp(fsp, fp); | |
765 | goto unlock; | |
766 | } | |
767 | ||
768 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
769 | goto unlock; | |
770 | ||
771 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
772 | /* | |
773 | * received XFER RDY from the target | |
774 | * need to send data to the target | |
775 | */ | |
776 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
777 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
778 | WARN_ON(!dd); | |
779 | ||
780 | rc = fc_fcp_send_data(fsp, seq, | |
781 | (size_t) ntohl(dd->ft_data_ro), | |
782 | (size_t) ntohl(dd->ft_burst_len)); | |
783 | if (!rc) | |
784 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
785 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
786 | /* | |
787 | * received a DATA frame | |
788 | * next we will copy the data to the system buffer | |
789 | */ | |
790 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
791 | fc_fcp_recv_data(fsp, fp); | |
792 | seq->rec_data = fsp->xfer_contig_end; | |
793 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
794 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
795 | ||
796 | fc_fcp_resp(fsp, fp); | |
797 | } else { | |
7414705e | 798 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
799 | } |
800 | unlock: | |
801 | fc_fcp_unlock_pkt(fsp); | |
802 | out: | |
803 | fc_frame_free(fp); | |
42e9a92f RL |
804 | } |
805 | ||
3a3b42bf RL |
806 | /** |
807 | * fc_fcp_resp() - Handler for FCP responses | |
808 | * @fsp: The FCP packet the response is for | |
809 | * @fp: The response frame | |
810 | */ | |
42e9a92f RL |
811 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
812 | { | |
813 | struct fc_frame_header *fh; | |
814 | struct fcp_resp *fc_rp; | |
815 | struct fcp_resp_ext *rp_ex; | |
816 | struct fcp_resp_rsp_info *fc_rp_info; | |
817 | u32 plen; | |
818 | u32 expected_len; | |
819 | u32 respl = 0; | |
820 | u32 snsl = 0; | |
821 | u8 flags = 0; | |
822 | ||
823 | plen = fr_len(fp); | |
824 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
825 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
826 | goto len_err; | |
827 | plen -= sizeof(*fh); | |
828 | fc_rp = (struct fcp_resp *)(fh + 1); | |
829 | fsp->cdb_status = fc_rp->fr_status; | |
830 | flags = fc_rp->fr_flags; | |
831 | fsp->scsi_comp_flags = flags; | |
832 | expected_len = fsp->data_len; | |
833 | ||
b277d2aa YZ |
834 | /* if ddp, update xfer len */ |
835 | fc_fcp_ddp_done(fsp); | |
836 | ||
42e9a92f RL |
837 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
838 | rp_ex = (void *)(fc_rp + 1); | |
839 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
840 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
841 | goto len_err; | |
842 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
843 | if (flags & FCP_RSP_LEN_VAL) { | |
844 | respl = ntohl(rp_ex->fr_rsp_len); | |
845 | if (respl != sizeof(*fc_rp_info)) | |
846 | goto len_err; | |
847 | if (fsp->wait_for_comp) { | |
848 | /* Abuse cdb_status for rsp code */ | |
849 | fsp->cdb_status = fc_rp_info->rsp_code; | |
850 | complete(&fsp->tm_done); | |
851 | /* | |
852 | * tmfs will not have any scsi cmd so | |
853 | * exit here | |
854 | */ | |
855 | return; | |
63ac4bbf | 856 | } |
42e9a92f RL |
857 | } |
858 | if (flags & FCP_SNS_LEN_VAL) { | |
859 | snsl = ntohl(rp_ex->fr_sns_len); | |
860 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
861 | snsl = SCSI_SENSE_BUFFERSIZE; | |
862 | memcpy(fsp->cmd->sense_buffer, | |
863 | (char *)fc_rp_info + respl, snsl); | |
864 | } | |
865 | } | |
866 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
867 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
868 | goto len_err; | |
869 | if (flags & FCP_RESID_UNDER) { | |
870 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
871 | /* | |
872 | * The cmnd->underflow is the minimum number of | |
25985edc | 873 | * bytes that must be transferred for this |
42e9a92f RL |
874 | * command. Provided a sense condition is not |
875 | * present, make sure the actual amount | |
876 | * transferred is at least the underflow value | |
877 | * or fail. | |
878 | */ | |
879 | if (!(flags & FCP_SNS_LEN_VAL) && | |
880 | (fc_rp->fr_status == 0) && | |
881 | (scsi_bufflen(fsp->cmd) - | |
882 | fsp->scsi_resid) < fsp->cmd->underflow) | |
883 | goto err; | |
884 | expected_len -= fsp->scsi_resid; | |
885 | } else { | |
886 | fsp->status_code = FC_ERROR; | |
887 | } | |
888 | } | |
889 | } | |
890 | fsp->state |= FC_SRB_RCV_STATUS; | |
891 | ||
892 | /* | |
893 | * Check for missing or extra data frames. | |
894 | */ | |
895 | if (unlikely(fsp->xfer_len != expected_len)) { | |
896 | if (fsp->xfer_len < expected_len) { | |
897 | /* | |
898 | * Some data may be queued locally, | |
899 | * Wait a at least one jiffy to see if it is delivered. | |
900 | * If this expires without data, we may do SRR. | |
901 | */ | |
902 | fc_fcp_timer_set(fsp, 2); | |
903 | return; | |
904 | } | |
905 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 906 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
907 | "len %x, data len %x\n", |
908 | fsp->rport->port_id, | |
909 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
910 | } |
911 | fc_fcp_complete_locked(fsp); | |
912 | return; | |
913 | ||
914 | len_err: | |
7414705e RL |
915 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
916 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
917 | err: |
918 | fsp->status_code = FC_ERROR; | |
919 | fc_fcp_complete_locked(fsp); | |
920 | } | |
921 | ||
922 | /** | |
3a3b42bf RL |
923 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
924 | * fcp_pkt lock held | |
925 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
926 | * |
927 | * This function may sleep if a timer is pending. The packet lock must be | |
928 | * held, and the host lock must not be held. | |
929 | */ | |
930 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
931 | { | |
3a3b42bf | 932 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
933 | struct fc_seq *seq; |
934 | struct fc_exch *ep; | |
935 | u32 f_ctl; | |
936 | ||
937 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
938 | return; | |
939 | ||
940 | if (fsp->state & FC_SRB_ABORTED) { | |
941 | if (!fsp->status_code) | |
942 | fsp->status_code = FC_CMD_ABORTED; | |
943 | } else { | |
944 | /* | |
945 | * Test for transport underrun, independent of response | |
946 | * underrun status. | |
947 | */ | |
948 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
949 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
950 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
951 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 952 | fsp->io_status = 0; |
42e9a92f RL |
953 | } |
954 | } | |
955 | ||
956 | seq = fsp->seq_ptr; | |
957 | if (seq) { | |
958 | fsp->seq_ptr = NULL; | |
959 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
960 | struct fc_frame *conf_frame; | |
961 | struct fc_seq *csp; | |
962 | ||
3a3b42bf | 963 | csp = lport->tt.seq_start_next(seq); |
c46be11a | 964 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
965 | if (conf_frame) { |
966 | f_ctl = FC_FC_SEQ_INIT; | |
967 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
968 | ep = fc_seq_exch(seq); | |
969 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
970 | ep->did, ep->sid, | |
971 | FC_TYPE_FCP, f_ctl, 0); | |
3a3b42bf | 972 | lport->tt.seq_send(lport, csp, conf_frame); |
42e9a92f RL |
973 | } |
974 | } | |
3a3b42bf | 975 | lport->tt.exch_done(seq); |
42e9a92f | 976 | } |
d889b30a YZ |
977 | /* |
978 | * Some resets driven by SCSI are not I/Os and do not have | |
979 | * SCSI commands associated with the requests. We should not | |
980 | * call I/O completion if we do not have a SCSI command. | |
981 | */ | |
982 | if (fsp->cmd) | |
983 | fc_io_compl(fsp); | |
42e9a92f RL |
984 | } |
985 | ||
3a3b42bf RL |
986 | /** |
987 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
988 | * @fsp: The FCP packet whose exchanges should be canceled | |
989 | * @error: The reason for the cancellation | |
990 | */ | |
42e9a92f RL |
991 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
992 | { | |
3a3b42bf | 993 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
994 | |
995 | if (fsp->seq_ptr) { | |
3a3b42bf | 996 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
997 | fsp->seq_ptr = NULL; |
998 | } | |
999 | fsp->status_code = error; | |
1000 | } | |
1001 | ||
1002 | /** | |
3a3b42bf RL |
1003 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
1004 | * @lport: The local port whose exchanges should be canceled | |
1005 | * @id: The target's ID | |
1006 | * @lun: The LUN | |
1007 | * @error: The reason for cancellation | |
42e9a92f RL |
1008 | * |
1009 | * If lun or id is -1, they are ignored. | |
1010 | */ | |
3a3b42bf | 1011 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
1012 | unsigned int lun, int error) |
1013 | { | |
3a3b42bf | 1014 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
1015 | struct fc_fcp_pkt *fsp; |
1016 | struct scsi_cmnd *sc_cmd; | |
1017 | unsigned long flags; | |
1018 | ||
c1ecb90a | 1019 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1020 | restart: |
1021 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1022 | sc_cmd = fsp->cmd; | |
1023 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1024 | continue; | |
1025 | ||
1026 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1027 | continue; | |
1028 | ||
1029 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1030 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1031 | |
1032 | if (!fc_fcp_lock_pkt(fsp)) { | |
1033 | fc_fcp_cleanup_cmd(fsp, error); | |
1034 | fc_io_compl(fsp); | |
1035 | fc_fcp_unlock_pkt(fsp); | |
1036 | } | |
1037 | ||
1038 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1039 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1040 | /* |
1041 | * while we dropped the lock multiple pkts could | |
1042 | * have been released, so we have to start over. | |
1043 | */ | |
1044 | goto restart; | |
1045 | } | |
c1ecb90a | 1046 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1047 | } |
1048 | ||
3a3b42bf RL |
1049 | /** |
1050 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1051 | * @lport: The local port whose exchanges are to be aborted | |
1052 | */ | |
1053 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1054 | { |
3a3b42bf | 1055 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1056 | } |
1057 | ||
1058 | /** | |
3a3b42bf RL |
1059 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1060 | * @lport: The local port to send the FCP packet on | |
1061 | * @fsp: The FCP packet to send | |
42e9a92f | 1062 | * |
3a3b42bf | 1063 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1064 | * Locks: Called without locks held |
42e9a92f | 1065 | */ |
3a3b42bf | 1066 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1067 | { |
3a3b42bf | 1068 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1069 | unsigned long flags; |
42e9a92f RL |
1070 | int rc; |
1071 | ||
1072 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1073 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1074 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1075 | ||
1076 | int_to_scsilun(fsp->cmd->device->lun, | |
1077 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1078 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
42e9a92f | 1079 | |
c1ecb90a CL |
1080 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1081 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1082 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1083 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1084 | if (unlikely(rc)) { |
1085 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f | 1086 | list_del(&fsp->list); |
c1ecb90a CL |
1087 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1088 | } | |
42e9a92f RL |
1089 | |
1090 | return rc; | |
1091 | } | |
1092 | ||
e0883a3c | 1093 | /** |
1094 | * get_fsp_rec_tov() - Helper function to get REC_TOV | |
1095 | * @fsp: the FCP packet | |
1096 | */ | |
1097 | static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) | |
1098 | { | |
1099 | struct fc_rport *rport; | |
1100 | struct fc_rport_libfc_priv *rpriv; | |
1101 | ||
1102 | rport = fsp->rport; | |
1103 | rpriv = rport->dd_data; | |
1104 | ||
1105 | return rpriv->e_d_tov + REC_TOV_CONST; | |
1106 | } | |
1107 | ||
3a3b42bf RL |
1108 | /** |
1109 | * fc_fcp_cmd_send() - Send a FCP command | |
1110 | * @lport: The local port to send the command on | |
1111 | * @fsp: The FCP packet the command is on | |
1112 | * @resp: The handler for the response | |
1113 | */ | |
1114 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1115 | void (*resp)(struct fc_seq *, |
1116 | struct fc_frame *fp, | |
1117 | void *arg)) | |
1118 | { | |
1119 | struct fc_frame *fp; | |
1120 | struct fc_seq *seq; | |
1121 | struct fc_rport *rport; | |
3a3b42bf | 1122 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1123 | const size_t len = sizeof(fsp->cdb_cmd); |
1124 | int rc = 0; | |
e0883a3c | 1125 | unsigned int rec_tov; |
42e9a92f RL |
1126 | |
1127 | if (fc_fcp_lock_pkt(fsp)) | |
1128 | return 0; | |
1129 | ||
c46be11a | 1130 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1131 | if (!fp) { |
1132 | rc = -1; | |
1133 | goto unlock; | |
1134 | } | |
1135 | ||
1136 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1137 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1138 | rport = fsp->rport; |
1139 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1140 | rpriv = rport->dd_data; |
42e9a92f RL |
1141 | |
1142 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
7b2787ec | 1143 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1144 | FC_FCTL_REQ, 0); |
42e9a92f | 1145 | |
3a3b42bf RL |
1146 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
1147 | fsp, 0); | |
42e9a92f | 1148 | if (!seq) { |
42e9a92f RL |
1149 | rc = -1; |
1150 | goto unlock; | |
1151 | } | |
1152 | fsp->last_pkt_time = jiffies; | |
1153 | fsp->seq_ptr = seq; | |
1154 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1155 | ||
e0883a3c | 1156 | rec_tov = get_fsp_rec_tov(fsp); |
1157 | ||
42e9a92f | 1158 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); |
e0883a3c | 1159 | |
05fee645 | 1160 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
e0883a3c | 1161 | fc_fcp_timer_set(fsp, rec_tov); |
05fee645 | 1162 | |
42e9a92f RL |
1163 | unlock: |
1164 | fc_fcp_unlock_pkt(fsp); | |
1165 | return rc; | |
1166 | } | |
1167 | ||
3a3b42bf RL |
1168 | /** |
1169 | * fc_fcp_error() - Handler for FCP layer errors | |
1170 | * @fsp: The FCP packet the error is on | |
1171 | * @fp: The frame that has errored | |
42e9a92f RL |
1172 | */ |
1173 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1174 | { | |
1175 | int error = PTR_ERR(fp); | |
1176 | ||
1177 | if (fc_fcp_lock_pkt(fsp)) | |
1178 | return; | |
1179 | ||
7414705e | 1180 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1181 | fc_fcp_retry_cmd(fsp); |
1182 | goto unlock; | |
42e9a92f | 1183 | } |
7414705e | 1184 | |
42e9a92f RL |
1185 | /* |
1186 | * clear abort pending, because the lower layer | |
1187 | * decided to force completion. | |
1188 | */ | |
1189 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1190 | fsp->status_code = FC_CMD_PLOGO; | |
1191 | fc_fcp_complete_locked(fsp); | |
1192 | unlock: | |
1193 | fc_fcp_unlock_pkt(fsp); | |
1194 | } | |
1195 | ||
3a3b42bf RL |
1196 | /** |
1197 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1198 | * @fsp: The FCP packet to abort on | |
1199 | * | |
1200 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1201 | */ |
c340111d | 1202 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1203 | { |
1204 | int rc = FAILED; | |
fa79dbdb | 1205 | unsigned long ticks_left; |
42e9a92f RL |
1206 | |
1207 | if (fc_fcp_send_abort(fsp)) | |
1208 | return FAILED; | |
1209 | ||
1210 | init_completion(&fsp->tm_done); | |
1211 | fsp->wait_for_comp = 1; | |
1212 | ||
1213 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
fa79dbdb HD |
1214 | ticks_left = wait_for_completion_timeout(&fsp->tm_done, |
1215 | FC_SCSI_TM_TOV); | |
42e9a92f RL |
1216 | spin_lock_bh(&fsp->scsi_pkt_lock); |
1217 | fsp->wait_for_comp = 0; | |
1218 | ||
fa79dbdb | 1219 | if (!ticks_left) { |
7414705e | 1220 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f | 1221 | } else if (fsp->state & FC_SRB_ABORTED) { |
7414705e | 1222 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1223 | rc = SUCCESS; |
1224 | fc_fcp_complete_locked(fsp); | |
1225 | } | |
1226 | ||
1227 | return rc; | |
1228 | } | |
1229 | ||
3a3b42bf RL |
1230 | /** |
1231 | * fc_lun_reset_send() - Send LUN reset command | |
1232 | * @data: The FCP packet that identifies the LUN to be reset | |
42e9a92f RL |
1233 | */ |
1234 | static void fc_lun_reset_send(unsigned long data) | |
1235 | { | |
1236 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
3a3b42bf | 1237 | struct fc_lport *lport = fsp->lp; |
e0883a3c | 1238 | unsigned int rec_tov; |
1239 | ||
3a3b42bf | 1240 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { |
42e9a92f RL |
1241 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1242 | return; | |
1243 | if (fc_fcp_lock_pkt(fsp)) | |
1244 | return; | |
e0883a3c | 1245 | rec_tov = get_fsp_rec_tov(fsp); |
42e9a92f | 1246 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); |
e0883a3c | 1247 | fc_fcp_timer_set(fsp, rec_tov); |
42e9a92f RL |
1248 | fc_fcp_unlock_pkt(fsp); |
1249 | } | |
1250 | } | |
1251 | ||
3a3b42bf RL |
1252 | /** |
1253 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1254 | * and wait for the reply | |
b595076a | 1255 | * @lport: The local port to sent the command on |
3a3b42bf RL |
1256 | * @fsp: The FCP packet that identifies the LUN to be reset |
1257 | * @id: The SCSI command ID | |
1258 | * @lun: The LUN ID to be reset | |
42e9a92f | 1259 | */ |
3a3b42bf | 1260 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1261 | unsigned int id, unsigned int lun) |
1262 | { | |
1263 | int rc; | |
1264 | ||
1265 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1266 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1267 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1268 | ||
1269 | fsp->wait_for_comp = 1; | |
1270 | init_completion(&fsp->tm_done); | |
1271 | ||
1272 | fc_lun_reset_send((unsigned long)fsp); | |
1273 | ||
1274 | /* | |
1275 | * wait for completion of reset | |
1276 | * after that make sure all commands are terminated | |
1277 | */ | |
1278 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1279 | ||
1280 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1281 | fsp->state |= FC_SRB_COMPL; | |
1282 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1283 | ||
1284 | del_timer_sync(&fsp->timer); | |
1285 | ||
1286 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1287 | if (fsp->seq_ptr) { | |
3a3b42bf | 1288 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1289 | fsp->seq_ptr = NULL; |
1290 | } | |
1291 | fsp->wait_for_comp = 0; | |
1292 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1293 | ||
1294 | if (!rc) { | |
3a3b42bf | 1295 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1296 | return FAILED; |
1297 | } | |
1298 | ||
1299 | /* cdb_status holds the tmf's rsp code */ | |
1300 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1301 | return FAILED; | |
1302 | ||
3a3b42bf RL |
1303 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1304 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1305 | return SUCCESS; |
1306 | } | |
1307 | ||
3a3b42bf | 1308 | /** |
25985edc | 1309 | * fc_tm_done() - Task Management response handler |
3a3b42bf RL |
1310 | * @seq: The sequence that the response is on |
1311 | * @fp: The response frame | |
1312 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1313 | */ |
1314 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1315 | { | |
1316 | struct fc_fcp_pkt *fsp = arg; | |
1317 | struct fc_frame_header *fh; | |
1318 | ||
1319 | if (IS_ERR(fp)) { | |
1320 | /* | |
1321 | * If there is an error just let it timeout or wait | |
1322 | * for TMF to be aborted if it timedout. | |
1323 | * | |
1324 | * scsi-eh will escalate for when either happens. | |
1325 | */ | |
e4a9a982 | 1326 | return; |
42e9a92f RL |
1327 | } |
1328 | ||
1329 | if (fc_fcp_lock_pkt(fsp)) | |
b5fe5e95 | 1330 | goto out; |
42e9a92f RL |
1331 | |
1332 | /* | |
1333 | * raced with eh timeout handler. | |
1334 | */ | |
b5fe5e95 YZ |
1335 | if (!fsp->seq_ptr || !fsp->wait_for_comp) |
1336 | goto out_unlock; | |
42e9a92f RL |
1337 | |
1338 | fh = fc_frame_header_get(fp); | |
1339 | if (fh->fh_type != FC_TYPE_BLS) | |
1340 | fc_fcp_resp(fsp, fp); | |
1341 | fsp->seq_ptr = NULL; | |
1342 | fsp->lp->tt.exch_done(seq); | |
b5fe5e95 | 1343 | out_unlock: |
42e9a92f | 1344 | fc_fcp_unlock_pkt(fsp); |
b5fe5e95 YZ |
1345 | out: |
1346 | fc_frame_free(fp); | |
42e9a92f RL |
1347 | } |
1348 | ||
3a3b42bf RL |
1349 | /** |
1350 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1351 | * @lport: The local port to be cleaned up | |
1352 | */ | |
1353 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1354 | { |
3a3b42bf | 1355 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1356 | } |
1357 | ||
3a3b42bf RL |
1358 | /** |
1359 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
1360 | * @data: The FCP packet that has timed out | |
42e9a92f | 1361 | * |
3a3b42bf RL |
1362 | * If REC is supported then just issue it and return. The REC exchange will |
1363 | * complete or time out and recovery can continue at that point. Otherwise, | |
1364 | * if the response has been received without all the data it has been | |
1365 | * ER_TIMEOUT since the response was received. If the response has not been | |
1366 | * received we see if data was received recently. If it has been then we | |
1367 | * continue waiting, otherwise, we abort the command. | |
42e9a92f RL |
1368 | */ |
1369 | static void fc_fcp_timeout(unsigned long data) | |
1370 | { | |
1371 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1372 | struct fc_rport *rport = fsp->rport; | |
3a3b42bf | 1373 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1374 | |
1375 | if (fc_fcp_lock_pkt(fsp)) | |
1376 | return; | |
1377 | ||
1378 | if (fsp->cdb_cmd.fc_tm_flags) | |
1379 | goto unlock; | |
1380 | ||
1381 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1382 | ||
3a3b42bf | 1383 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
42e9a92f | 1384 | fc_fcp_rec(fsp); |
42e9a92f RL |
1385 | else if (fsp->state & FC_SRB_RCV_STATUS) |
1386 | fc_fcp_complete_locked(fsp); | |
1387 | else | |
ac17ea8d | 1388 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1389 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1390 | unlock: | |
1391 | fc_fcp_unlock_pkt(fsp); | |
1392 | } | |
1393 | ||
3a3b42bf RL |
1394 | /** |
1395 | * fc_fcp_rec() - Send a REC ELS request | |
1396 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1397 | */ |
1398 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1399 | { | |
3a3b42bf | 1400 | struct fc_lport *lport; |
42e9a92f RL |
1401 | struct fc_frame *fp; |
1402 | struct fc_rport *rport; | |
3a3b42bf | 1403 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1404 | |
3a3b42bf | 1405 | lport = fsp->lp; |
42e9a92f | 1406 | rport = fsp->rport; |
3a3b42bf RL |
1407 | rpriv = rport->dd_data; |
1408 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1409 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1410 | fsp->io_status = 0; |
42e9a92f RL |
1411 | fc_fcp_complete_locked(fsp); |
1412 | return; | |
1413 | } | |
e0883a3c | 1414 | |
c46be11a | 1415 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1416 | if (!fp) |
1417 | goto retry; | |
1418 | ||
1419 | fr_seq(fp) = fsp->seq_ptr; | |
1420 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
7b2787ec | 1421 | rpriv->local_port->port_id, FC_TYPE_ELS, |
24f089e2 | 1422 | FC_FCTL_REQ, 0); |
3a3b42bf RL |
1423 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1424 | fc_fcp_rec_resp, fsp, | |
3a91090f | 1425 | 2 * lport->r_a_tov)) { |
42e9a92f RL |
1426 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1427 | return; | |
1428 | } | |
42e9a92f RL |
1429 | retry: |
1430 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
3a91090f | 1431 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f | 1432 | else |
ac17ea8d | 1433 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1434 | } |
1435 | ||
3a3b42bf RL |
1436 | /** |
1437 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1438 | * @seq: The sequence the response is on | |
1439 | * @fp: The response frame | |
1440 | * @arg: The FCP packet the response is on | |
1441 | * | |
1442 | * If the response is a reject then the scsi layer will handle | |
1443 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1444 | * set the timeout and return. If the I/O was completed then complete the | |
1445 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1446 | */ |
1447 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1448 | { | |
1449 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1450 | struct fc_els_rec_acc *recp; | |
1451 | struct fc_els_ls_rjt *rjt; | |
1452 | u32 e_stat; | |
1453 | u8 opcode; | |
1454 | u32 offset; | |
1455 | enum dma_data_direction data_dir; | |
1456 | enum fc_rctl r_ctl; | |
3a3b42bf | 1457 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1458 | |
1459 | if (IS_ERR(fp)) { | |
1460 | fc_fcp_rec_error(fsp, fp); | |
1461 | return; | |
1462 | } | |
1463 | ||
1464 | if (fc_fcp_lock_pkt(fsp)) | |
1465 | goto out; | |
1466 | ||
1467 | fsp->recov_retry = 0; | |
1468 | opcode = fc_frame_payload_op(fp); | |
1469 | if (opcode == ELS_LS_RJT) { | |
1470 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1471 | switch (rjt->er_reason) { | |
1472 | default: | |
7414705e RL |
1473 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1474 | "reason %d expl %d\n", | |
1475 | fsp->rport->port_id, rjt->er_reason, | |
1476 | rjt->er_explan); | |
42e9a92f RL |
1477 | /* fall through */ |
1478 | case ELS_RJT_UNSUP: | |
7414705e | 1479 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1480 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1481 | /* |
1482 | * if we do not spport RECs or got some bogus | |
1483 | * reason then resetup timer so we check for | |
1484 | * making progress. | |
1485 | */ | |
3a3b42bf | 1486 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1487 | break; |
1488 | case ELS_RJT_LOGIC: | |
1489 | case ELS_RJT_UNAB: | |
1490 | /* | |
1491 | * If no data transfer, the command frame got dropped | |
1492 | * so we just retry. If data was transferred, we | |
1493 | * lost the response but the target has no record, | |
1494 | * so we abort and retry. | |
1495 | */ | |
1496 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1497 | fsp->xfer_len == 0) { | |
1498 | fc_fcp_retry_cmd(fsp); | |
1499 | break; | |
1500 | } | |
ac17ea8d | 1501 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1502 | break; |
1503 | } | |
1504 | } else if (opcode == ELS_LS_ACC) { | |
1505 | if (fsp->state & FC_SRB_ABORTED) | |
1506 | goto unlock_out; | |
1507 | ||
1508 | data_dir = fsp->cmd->sc_data_direction; | |
1509 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1510 | offset = ntohl(recp->reca_fc4value); | |
1511 | e_stat = ntohl(recp->reca_e_stat); | |
1512 | ||
1513 | if (e_stat & ESB_ST_COMPLETE) { | |
1514 | ||
1515 | /* | |
1516 | * The exchange is complete. | |
1517 | * | |
1518 | * For output, we must've lost the response. | |
1519 | * For input, all data must've been sent. | |
1520 | * We lost may have lost the response | |
1521 | * (and a confirmation was requested) and maybe | |
1522 | * some data. | |
1523 | * | |
1524 | * If all data received, send SRR | |
1525 | * asking for response. If partial data received, | |
1526 | * or gaps, SRR requests data at start of gap. | |
1527 | * Recovery via SRR relies on in-order-delivery. | |
1528 | */ | |
1529 | if (data_dir == DMA_TO_DEVICE) { | |
1530 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1531 | } else if (fsp->xfer_contig_end == offset) { | |
1532 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1533 | } else { | |
1534 | offset = fsp->xfer_contig_end; | |
1535 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1536 | } | |
1537 | fc_fcp_srr(fsp, r_ctl, offset); | |
1538 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
e0883a3c | 1539 | unsigned int rec_tov = get_fsp_rec_tov(fsp); |
42e9a92f RL |
1540 | /* |
1541 | * The remote port has the initiative, so just | |
1542 | * keep waiting for it to complete. | |
1543 | */ | |
e0883a3c | 1544 | fc_fcp_timer_set(fsp, rec_tov); |
42e9a92f RL |
1545 | } else { |
1546 | ||
1547 | /* | |
1548 | * The exchange is incomplete, we have seq. initiative. | |
1549 | * Lost response with requested confirmation, | |
1550 | * lost confirmation, lost transfer ready or | |
1551 | * lost write data. | |
1552 | * | |
1553 | * For output, if not all data was received, ask | |
1554 | * for transfer ready to be repeated. | |
1555 | * | |
1556 | * If we received or sent all the data, send SRR to | |
1557 | * request response. | |
1558 | * | |
1559 | * If we lost a response, we may have lost some read | |
1560 | * data as well. | |
1561 | */ | |
1562 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1563 | if (data_dir == DMA_TO_DEVICE) { | |
1564 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1565 | if (offset < fsp->data_len) | |
1566 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1567 | } else if (offset == fsp->xfer_contig_end) { | |
1568 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1569 | } else if (fsp->xfer_contig_end < offset) { | |
1570 | offset = fsp->xfer_contig_end; | |
1571 | } | |
1572 | fc_fcp_srr(fsp, r_ctl, offset); | |
1573 | } | |
1574 | } | |
1575 | unlock_out: | |
1576 | fc_fcp_unlock_pkt(fsp); | |
1577 | out: | |
1578 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1579 | fc_frame_free(fp); | |
1580 | } | |
1581 | ||
3a3b42bf RL |
1582 | /** |
1583 | * fc_fcp_rec_error() - Handler for REC errors | |
1584 | * @fsp: The FCP packet the error is on | |
1585 | * @fp: The REC frame | |
42e9a92f RL |
1586 | */ |
1587 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1588 | { | |
1589 | int error = PTR_ERR(fp); | |
1590 | ||
1591 | if (fc_fcp_lock_pkt(fsp)) | |
1592 | goto out; | |
1593 | ||
1594 | switch (error) { | |
1595 | case -FC_EX_CLOSED: | |
1596 | fc_fcp_retry_cmd(fsp); | |
1597 | break; | |
1598 | ||
1599 | default: | |
ce8b5df0 | 1600 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1601 | fsp, fsp->rport->port_id, error); |
42e9a92f RL |
1602 | fsp->status_code = FC_CMD_PLOGO; |
1603 | /* fall through */ | |
1604 | ||
1605 | case -FC_EX_TIMEOUT: | |
1606 | /* | |
1607 | * Assume REC or LS_ACC was lost. | |
1608 | * The exchange manager will have aborted REC, so retry. | |
1609 | */ | |
ce8b5df0 | 1610 | FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", |
7414705e RL |
1611 | fsp->rport->port_id, error, fsp->recov_retry, |
1612 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1613 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1614 | fc_fcp_rec(fsp); | |
1615 | else | |
ac17ea8d | 1616 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1617 | break; |
1618 | } | |
1619 | fc_fcp_unlock_pkt(fsp); | |
1620 | out: | |
1621 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1622 | } | |
1623 | ||
3a3b42bf | 1624 | /** |
5c12c418 VD |
1625 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1626 | * @fsp: The FCP pkt that needs to be aborted | |
42e9a92f | 1627 | */ |
ac17ea8d | 1628 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) |
42e9a92f | 1629 | { |
ac17ea8d | 1630 | fsp->status_code = code; |
42e9a92f RL |
1631 | fsp->cdb_status = 0; |
1632 | fsp->io_status = 0; | |
1633 | /* | |
1634 | * if this fails then we let the scsi command timer fire and | |
1635 | * scsi-ml escalate. | |
1636 | */ | |
1637 | fc_fcp_send_abort(fsp); | |
1638 | } | |
1639 | ||
3a3b42bf RL |
1640 | /** |
1641 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1642 | * @fsp: The FCP packet the SRR is to be sent on | |
1643 | * @r_ctl: The R_CTL field for the SRR request | |
42e9a92f RL |
1644 | * This is called after receiving status but insufficient data, or |
1645 | * when expecting status but the request has timed out. | |
1646 | */ | |
1647 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1648 | { | |
3a3b42bf | 1649 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1650 | struct fc_rport *rport; |
3a3b42bf | 1651 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1652 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1653 | struct fc_seq *seq; | |
1654 | struct fcp_srr *srr; | |
1655 | struct fc_frame *fp; | |
1656 | u8 cdb_op; | |
e0883a3c | 1657 | unsigned int rec_tov; |
42e9a92f RL |
1658 | |
1659 | rport = fsp->rport; | |
3a3b42bf | 1660 | rpriv = rport->dd_data; |
42e9a92f RL |
1661 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; |
1662 | ||
3a3b42bf RL |
1663 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1664 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1665 | goto retry; /* shouldn't happen */ |
c46be11a | 1666 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1667 | if (!fp) |
1668 | goto retry; | |
1669 | ||
1670 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1671 | memset(srr, 0, sizeof(*srr)); | |
1672 | srr->srr_op = ELS_SRR; | |
1673 | srr->srr_ox_id = htons(ep->oxid); | |
1674 | srr->srr_rx_id = htons(ep->rxid); | |
1675 | srr->srr_r_ctl = r_ctl; | |
1676 | srr->srr_rel_off = htonl(offset); | |
1677 | ||
1678 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
7b2787ec | 1679 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1680 | FC_FCTL_REQ, 0); |
42e9a92f | 1681 | |
e0883a3c | 1682 | rec_tov = get_fsp_rec_tov(fsp); |
3a3b42bf | 1683 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, |
e0883a3c | 1684 | fsp, jiffies_to_msecs(rec_tov)); |
8f550f93 | 1685 | if (!seq) |
42e9a92f | 1686 | goto retry; |
8f550f93 | 1687 | |
42e9a92f RL |
1688 | fsp->recov_seq = seq; |
1689 | fsp->xfer_len = offset; | |
1690 | fsp->xfer_contig_end = offset; | |
1691 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1692 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1693 | return; | |
1694 | retry: | |
1695 | fc_fcp_retry_cmd(fsp); | |
1696 | } | |
1697 | ||
3a3b42bf RL |
1698 | /** |
1699 | * fc_fcp_srr_resp() - Handler for SRR response | |
1700 | * @seq: The sequence the SRR is on | |
1701 | * @fp: The SRR frame | |
1702 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1703 | */ |
1704 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1705 | { | |
1706 | struct fc_fcp_pkt *fsp = arg; | |
1707 | struct fc_frame_header *fh; | |
e0883a3c | 1708 | unsigned int rec_tov; |
42e9a92f RL |
1709 | |
1710 | if (IS_ERR(fp)) { | |
1711 | fc_fcp_srr_error(fsp, fp); | |
1712 | return; | |
1713 | } | |
1714 | ||
1715 | if (fc_fcp_lock_pkt(fsp)) | |
1716 | goto out; | |
1717 | ||
1718 | fh = fc_frame_header_get(fp); | |
1719 | /* | |
1720 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1721 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1722 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1723 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1724 | * an abort response though. | |
1725 | */ | |
1726 | if (fh->fh_type == FC_TYPE_BLS) { | |
1727 | fc_fcp_unlock_pkt(fsp); | |
1728 | return; | |
1729 | } | |
1730 | ||
1731 | fsp->recov_seq = NULL; | |
1732 | switch (fc_frame_payload_op(fp)) { | |
1733 | case ELS_LS_ACC: | |
1734 | fsp->recov_retry = 0; | |
e0883a3c | 1735 | rec_tov = get_fsp_rec_tov(fsp); |
1736 | fc_fcp_timer_set(fsp, rec_tov); | |
42e9a92f RL |
1737 | break; |
1738 | case ELS_LS_RJT: | |
1739 | default: | |
ac17ea8d | 1740 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1741 | break; |
1742 | } | |
1743 | fc_fcp_unlock_pkt(fsp); | |
1744 | fsp->lp->tt.exch_done(seq); | |
1745 | out: | |
1746 | fc_frame_free(fp); | |
1747 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1748 | } | |
1749 | ||
3a3b42bf RL |
1750 | /** |
1751 | * fc_fcp_srr_error() - Handler for SRR errors | |
1752 | * @fsp: The FCP packet that the SRR error is on | |
1753 | * @fp: The SRR frame | |
1754 | */ | |
42e9a92f RL |
1755 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1756 | { | |
1757 | if (fc_fcp_lock_pkt(fsp)) | |
1758 | goto out; | |
1759 | fsp->lp->tt.exch_done(fsp->recov_seq); | |
1760 | fsp->recov_seq = NULL; | |
1761 | switch (PTR_ERR(fp)) { | |
1762 | case -FC_EX_TIMEOUT: | |
1763 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1764 | fc_fcp_rec(fsp); | |
1765 | else | |
ac17ea8d | 1766 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1767 | break; |
1768 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1769 | /* fall through */ | |
1770 | default: | |
1771 | fc_fcp_retry_cmd(fsp); | |
1772 | break; | |
1773 | } | |
1774 | fc_fcp_unlock_pkt(fsp); | |
1775 | out: | |
1776 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1777 | } | |
1778 | ||
3a3b42bf RL |
1779 | /** |
1780 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1781 | * @lport: The local port to be checked | |
1782 | */ | |
1783 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1784 | { |
1785 | /* lock ? */ | |
3a3b42bf RL |
1786 | return (lport->state == LPORT_ST_READY) && |
1787 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1788 | } |
1789 | ||
1790 | /** | |
3a3b42bf | 1791 | * fc_queuecommand() - The queuecommand function of the SCSI template |
04885b16 | 1792 | * @shost: The Scsi_Host that the command was issued to |
3a3b42bf | 1793 | * @cmd: The scsi_cmnd to be executed |
42e9a92f | 1794 | * |
04885b16 | 1795 | * This is the i/o strategy routine, called by the SCSI layer. |
42e9a92f | 1796 | */ |
04885b16 | 1797 | int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) |
42e9a92f | 1798 | { |
04885b16 | 1799 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
1800 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1801 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1802 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1803 | int rval; |
1804 | int rc = 0; | |
1805 | struct fcoe_dev_stats *stats; | |
1806 | ||
42e9a92f RL |
1807 | rval = fc_remote_port_chkready(rport); |
1808 | if (rval) { | |
1809 | sc_cmd->result = rval; | |
04885b16 | 1810 | sc_cmd->scsi_done(sc_cmd); |
be948fc3 | 1811 | return 0; |
42e9a92f RL |
1812 | } |
1813 | ||
1814 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1815 | /* | |
1816 | * rport is transitioning from blocked/deleted to | |
1817 | * online | |
1818 | */ | |
1819 | sc_cmd->result = DID_IMM_RETRY << 16; | |
04885b16 | 1820 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
1821 | goto out; |
1822 | } | |
1823 | ||
3a3b42bf | 1824 | rpriv = rport->dd_data; |
42e9a92f | 1825 | |
3a3b42bf | 1826 | if (!fc_fcp_lport_queue_ready(lport)) { |
84c3e1ad VD |
1827 | if (lport->qfull) |
1828 | fc_fcp_can_queue_ramp_down(lport); | |
42e9a92f RL |
1829 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1830 | goto out; | |
1831 | } | |
1832 | ||
3a3b42bf | 1833 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1834 | if (fsp == NULL) { |
1835 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1836 | goto out; | |
1837 | } | |
1838 | ||
1839 | /* | |
1840 | * build the libfc request pkt | |
1841 | */ | |
1842 | fsp->cmd = sc_cmd; /* save the cmd */ | |
42e9a92f | 1843 | fsp->rport = rport; /* set the remote port ptr */ |
42e9a92f RL |
1844 | |
1845 | /* | |
1846 | * set up the transfer length | |
1847 | */ | |
1848 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1849 | fsp->xfer_len = 0; | |
1850 | ||
1851 | /* | |
1852 | * setup the data direction | |
1853 | */ | |
f018b73a | 1854 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f RL |
1855 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1856 | fsp->req_flags = FC_SRB_READ; | |
1857 | stats->InputRequests++; | |
5f0e385f | 1858 | stats->InputBytes += fsp->data_len; |
42e9a92f RL |
1859 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
1860 | fsp->req_flags = FC_SRB_WRITE; | |
1861 | stats->OutputRequests++; | |
5f0e385f | 1862 | stats->OutputBytes += fsp->data_len; |
42e9a92f RL |
1863 | } else { |
1864 | fsp->req_flags = 0; | |
1865 | stats->ControlRequests++; | |
1866 | } | |
f018b73a | 1867 | put_cpu(); |
42e9a92f | 1868 | |
42e9a92f RL |
1869 | init_timer(&fsp->timer); |
1870 | fsp->timer.data = (unsigned long)fsp; | |
1871 | ||
1872 | /* | |
1873 | * send it to the lower layer | |
1874 | * if we get -1 return then put the request in the pending | |
1875 | * queue. | |
1876 | */ | |
3a3b42bf | 1877 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1878 | if (rval != 0) { |
1879 | fsp->state = FC_SRB_FREE; | |
1880 | fc_fcp_pkt_release(fsp); | |
1881 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1882 | } | |
1883 | out: | |
1884 | return rc; | |
1885 | } | |
1886 | EXPORT_SYMBOL(fc_queuecommand); | |
1887 | ||
1888 | /** | |
3a3b42bf RL |
1889 | * fc_io_compl() - Handle responses for completed commands |
1890 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1891 | * |
3a3b42bf | 1892 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1893 | * The fcp packet lock must be held when calling. |
1894 | */ | |
1895 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1896 | { | |
1897 | struct fc_fcp_internal *si; | |
1898 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1899 | struct fc_lport *lport; |
42e9a92f RL |
1900 | unsigned long flags; |
1901 | ||
b277d2aa YZ |
1902 | /* release outstanding ddp context */ |
1903 | fc_fcp_ddp_done(fsp); | |
1904 | ||
42e9a92f RL |
1905 | fsp->state |= FC_SRB_COMPL; |
1906 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1907 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1908 | del_timer_sync(&fsp->timer); | |
1909 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1910 | } | |
1911 | ||
3a3b42bf RL |
1912 | lport = fsp->lp; |
1913 | si = fc_get_scsi_internal(lport); | |
42e9a92f RL |
1914 | |
1915 | /* | |
84c3e1ad VD |
1916 | * if can_queue ramp down is done then try can_queue ramp up |
1917 | * since commands are completing now. | |
42e9a92f | 1918 | */ |
84c3e1ad VD |
1919 | if (si->last_can_queue_ramp_down_time) |
1920 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1921 | |
1922 | sc_cmd = fsp->cmd; | |
42e9a92f RL |
1923 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; |
1924 | switch (fsp->status_code) { | |
1925 | case FC_COMPLETE: | |
1926 | if (fsp->cdb_status == 0) { | |
1927 | /* | |
1928 | * good I/O status | |
1929 | */ | |
1930 | sc_cmd->result = DID_OK << 16; | |
1931 | if (fsp->scsi_resid) | |
1932 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1933 | } else { |
1934 | /* | |
1935 | * transport level I/O was ok but scsi | |
1936 | * has non zero status | |
1937 | */ | |
1938 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1939 | } | |
1940 | break; | |
1941 | case FC_ERROR: | |
b3ef990c RL |
1942 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1943 | "due to FC_ERROR\n"); | |
42e9a92f RL |
1944 | sc_cmd->result = DID_ERROR << 16; |
1945 | break; | |
1946 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1947 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1948 | /* |
1949 | * scsi status is good but transport level | |
26d9cab5 | 1950 | * underrun. |
42e9a92f | 1951 | */ |
b3ef990c RL |
1952 | if (fsp->state & FC_SRB_RCV_STATUS) { |
1953 | sc_cmd->result = DID_OK << 16; | |
1954 | } else { | |
1955 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
1956 | " due to FC_DATA_UNDRUN (trans)\n"); | |
1957 | sc_cmd->result = DID_ERROR << 16; | |
1958 | } | |
42e9a92f RL |
1959 | } else { |
1960 | /* | |
1961 | * scsi got underrun, this is an error | |
1962 | */ | |
b3ef990c RL |
1963 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1964 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
42e9a92f RL |
1965 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
1966 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1967 | } | |
1968 | break; | |
1969 | case FC_DATA_OVRRUN: | |
1970 | /* | |
1971 | * overrun is an error | |
1972 | */ | |
b3ef990c RL |
1973 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1974 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
1975 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
1976 | break; | |
1977 | case FC_CMD_ABORTED: | |
b3ef990c | 1978 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
ac17ea8d | 1979 | "due to FC_CMD_ABORTED\n"); |
d5e6054a | 1980 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f | 1981 | break; |
42e9a92f | 1982 | case FC_CMD_RESET: |
ac17ea8d | 1983 | FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " |
1984 | "due to FC_CMD_RESET\n"); | |
42e9a92f RL |
1985 | sc_cmd->result = (DID_RESET << 16); |
1986 | break; | |
1987 | case FC_HRD_ERROR: | |
ac17ea8d | 1988 | FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " |
1989 | "due to FC_HRD_ERROR\n"); | |
42e9a92f RL |
1990 | sc_cmd->result = (DID_NO_CONNECT << 16); |
1991 | break; | |
ac17ea8d | 1992 | case FC_CRC_ERROR: |
1993 | FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " | |
1994 | "due to FC_CRC_ERROR\n"); | |
1995 | sc_cmd->result = (DID_PARITY << 16); | |
1996 | break; | |
1997 | case FC_TIMED_OUT: | |
1998 | FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " | |
1999 | "due to FC_TIMED_OUT\n"); | |
2000 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
2001 | break; | |
42e9a92f | 2002 | default: |
b3ef990c RL |
2003 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2004 | "due to unknown error\n"); | |
42e9a92f RL |
2005 | sc_cmd->result = (DID_ERROR << 16); |
2006 | break; | |
2007 | } | |
2008 | ||
75eee725 VD |
2009 | if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) |
2010 | sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); | |
e0d93c5b | 2011 | |
c1ecb90a | 2012 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2013 | list_del(&fsp->list); |
2014 | sc_cmd->SCp.ptr = NULL; | |
8b7ac2bb | 2015 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f | 2016 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
2017 | |
2018 | /* release ref from initial allocation in queue command */ | |
2019 | fc_fcp_pkt_release(fsp); | |
2020 | } | |
2021 | ||
42e9a92f | 2022 | /** |
34f42a07 | 2023 | * fc_eh_abort() - Abort a command |
3a3b42bf | 2024 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 2025 | * |
3a3b42bf RL |
2026 | * From SCSI host template. |
2027 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
2028 | */ |
2029 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
2030 | { | |
2031 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 2032 | struct fc_lport *lport; |
8b7ac2bb | 2033 | struct fc_fcp_internal *si; |
42e9a92f RL |
2034 | int rc = FAILED; |
2035 | unsigned long flags; | |
2036 | ||
3a3b42bf RL |
2037 | lport = shost_priv(sc_cmd->device->host); |
2038 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2039 | return rc; |
3a3b42bf | 2040 | else if (!lport->link_up) |
42e9a92f RL |
2041 | return rc; |
2042 | ||
8b7ac2bb VD |
2043 | si = fc_get_scsi_internal(lport); |
2044 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f RL |
2045 | fsp = CMD_SP(sc_cmd); |
2046 | if (!fsp) { | |
2047 | /* command completed while scsi eh was setting up */ | |
3c2c3bf2 | 2048 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2049 | return SUCCESS; |
2050 | } | |
2051 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
2052 | fc_fcp_pkt_hold(fsp); | |
8b7ac2bb | 2053 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2054 | |
2055 | if (fc_fcp_lock_pkt(fsp)) { | |
2056 | /* completed while we were waiting for timer to be deleted */ | |
2057 | rc = SUCCESS; | |
2058 | goto release_pkt; | |
2059 | } | |
2060 | ||
c340111d | 2061 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2062 | fc_fcp_unlock_pkt(fsp); |
2063 | ||
2064 | release_pkt: | |
2065 | fc_fcp_pkt_release(fsp); | |
2066 | return rc; | |
2067 | } | |
2068 | EXPORT_SYMBOL(fc_eh_abort); | |
2069 | ||
2070 | /** | |
3a3b42bf RL |
2071 | * fc_eh_device_reset() - Reset a single LUN |
2072 | * @sc_cmd: The SCSI command which identifies the device whose | |
2073 | * LUN is to be reset | |
42e9a92f | 2074 | * |
3a3b42bf | 2075 | * Set from SCSI host template. |
42e9a92f RL |
2076 | */ |
2077 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2078 | { | |
3a3b42bf | 2079 | struct fc_lport *lport; |
42e9a92f RL |
2080 | struct fc_fcp_pkt *fsp; |
2081 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2082 | int rc = FAILED; | |
42e9a92f RL |
2083 | int rval; |
2084 | ||
2085 | rval = fc_remote_port_chkready(rport); | |
2086 | if (rval) | |
2087 | goto out; | |
2088 | ||
3a3b42bf | 2089 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2090 | |
3a3b42bf | 2091 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2092 | return rc; |
2093 | ||
ce8b5df0 | 2094 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2095 | |
3a3b42bf | 2096 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2097 | if (fsp == NULL) { |
7414705e | 2098 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2099 | goto out; |
2100 | } | |
2101 | ||
2102 | /* | |
2103 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2104 | * the sc passed in is not setup for execution like when sent | |
2105 | * through the queuecommand callout. | |
2106 | */ | |
42e9a92f RL |
2107 | fsp->rport = rport; /* set the remote port ptr */ |
2108 | ||
2109 | /* | |
2110 | * flush outstanding commands | |
2111 | */ | |
3a3b42bf | 2112 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2113 | fsp->state = FC_SRB_FREE; |
2114 | fc_fcp_pkt_release(fsp); | |
2115 | ||
2116 | out: | |
2117 | return rc; | |
2118 | } | |
2119 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2120 | ||
2121 | /** | |
3a3b42bf RL |
2122 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2123 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2124 | */ |
2125 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2126 | { | |
2127 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2128 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2129 | unsigned long wait_tmo; |
2130 | ||
3a3b42bf | 2131 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2132 | |
3a3b42bf | 2133 | lport->tt.lport_reset(lport); |
42e9a92f | 2134 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2135 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2136 | wait_tmo)) | |
42e9a92f RL |
2137 | msleep(1000); |
2138 | ||
3a3b42bf | 2139 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2140 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
7b2787ec | 2141 | "on port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2142 | return SUCCESS; |
2143 | } else { | |
7414705e | 2144 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2145 | "port (%6.6x) is not ready.\n", |
7b2787ec | 2146 | lport->port_id); |
42e9a92f RL |
2147 | return FAILED; |
2148 | } | |
2149 | } | |
2150 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2151 | ||
2152 | /** | |
3a3b42bf RL |
2153 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2154 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2155 | * |
2156 | * Configures queue depth based on host's cmd_per_len. If not set | |
2157 | * then we use the libfc default. | |
2158 | */ | |
2159 | int fc_slave_alloc(struct scsi_device *sdev) | |
2160 | { | |
2161 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2162 | |
2163 | if (!rport || fc_remote_port_chkready(rport)) | |
2164 | return -ENXIO; | |
2165 | ||
14caf44c VD |
2166 | if (sdev->tagged_supported) |
2167 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2168 | else | |
2169 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2170 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2171 | ||
42e9a92f RL |
2172 | return 0; |
2173 | } | |
2174 | EXPORT_SYMBOL(fc_slave_alloc); | |
2175 | ||
3a3b42bf RL |
2176 | /** |
2177 | * fc_change_queue_depth() - Change a device's queue depth | |
2178 | * @sdev: The SCSI device whose queue depth is to change | |
2179 | * @qdepth: The new queue depth | |
2180 | * @reason: The resason for the change | |
2181 | */ | |
e881a172 | 2182 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2183 | { |
5c20848a MC |
2184 | switch (reason) { |
2185 | case SCSI_QDEPTH_DEFAULT: | |
2186 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2187 | break; | |
2188 | case SCSI_QDEPTH_QFULL: | |
2189 | scsi_track_queue_full(sdev, qdepth); | |
2190 | break; | |
229b8d72 VD |
2191 | case SCSI_QDEPTH_RAMP_UP: |
2192 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2193 | break; | |
5c20848a | 2194 | default: |
e881a172 | 2195 | return -EOPNOTSUPP; |
5c20848a | 2196 | } |
42e9a92f RL |
2197 | return sdev->queue_depth; |
2198 | } | |
2199 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2200 | ||
3a3b42bf RL |
2201 | /** |
2202 | * fc_change_queue_type() - Change a device's queue type | |
2203 | * @sdev: The SCSI device whose queue depth is to change | |
2204 | * @tag_type: Identifier for queue type | |
2205 | */ | |
42e9a92f RL |
2206 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
2207 | { | |
2208 | if (sdev->tagged_supported) { | |
2209 | scsi_set_tag_type(sdev, tag_type); | |
2210 | if (tag_type) | |
2211 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2212 | else | |
2213 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2214 | } else | |
2215 | tag_type = 0; | |
2216 | ||
2217 | return tag_type; | |
2218 | } | |
2219 | EXPORT_SYMBOL(fc_change_queue_type); | |
2220 | ||
3a3b42bf RL |
2221 | /** |
2222 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2223 | * @lport: The local port that no longer needs the FCP layer | |
2224 | */ | |
2225 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2226 | { |
3a3b42bf | 2227 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2228 | |
2229 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2230 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
7b2787ec | 2231 | "port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2232 | |
2233 | mempool_destroy(si->scsi_pkt_pool); | |
2234 | kfree(si); | |
3a3b42bf | 2235 | lport->scsi_priv = NULL; |
42e9a92f RL |
2236 | } |
2237 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2238 | ||
55204909 | 2239 | int fc_setup_fcp(void) |
93e6d5ab RL |
2240 | { |
2241 | int rc = 0; | |
2242 | ||
2243 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2244 | sizeof(struct fc_fcp_pkt), | |
2245 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2246 | if (!scsi_pkt_cachep) { | |
2247 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2248 | "module load failed!"); | |
2249 | rc = -ENOMEM; | |
2250 | } | |
2251 | ||
2252 | return rc; | |
2253 | } | |
2254 | ||
55204909 | 2255 | void fc_destroy_fcp(void) |
93e6d5ab RL |
2256 | { |
2257 | if (scsi_pkt_cachep) | |
2258 | kmem_cache_destroy(scsi_pkt_cachep); | |
2259 | } | |
2260 | ||
3a3b42bf RL |
2261 | /** |
2262 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2263 | * @lport: The local port to initialize the exchange layer for | |
2264 | */ | |
2265 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2266 | { |
2267 | int rc; | |
2268 | struct fc_fcp_internal *si; | |
2269 | ||
3a3b42bf RL |
2270 | if (!lport->tt.fcp_cmd_send) |
2271 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2272 | |
3a3b42bf RL |
2273 | if (!lport->tt.fcp_cleanup) |
2274 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2275 | |
3a3b42bf RL |
2276 | if (!lport->tt.fcp_abort_io) |
2277 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2278 | |
2279 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2280 | if (!si) | |
2281 | return -ENOMEM; | |
3a3b42bf | 2282 | lport->scsi_priv = si; |
84c3e1ad | 2283 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2284 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2285 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2286 | |
2287 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2288 | if (!si->scsi_pkt_pool) { | |
2289 | rc = -ENOMEM; | |
2290 | goto free_internal; | |
2291 | } | |
2292 | return 0; | |
2293 | ||
2294 | free_internal: | |
2295 | kfree(si); | |
2296 | return rc; | |
2297 | } | |
2298 | EXPORT_SYMBOL(fc_fcp_init); |