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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 | ||
60 | /* | |
8b7ac2bb | 61 | * The SCp.ptr should be tested and set under the scsi_pkt_queue lock |
42e9a92f RL |
62 | */ |
63 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) | |
64 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) | |
65 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) | |
66 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) | |
67 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) | |
68 | ||
3a3b42bf RL |
69 | /** |
70 | * struct fc_fcp_internal - FCP layer internal data | |
c1ecb90a CL |
71 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
72 | * @scsi_queue_lock: Protects the scsi_pkt_queue | |
3a3b42bf | 73 | * @scsi_pkt_queue: Current FCP packets |
84c3e1ad VD |
74 | * @last_can_queue_ramp_down_time: ramp down time |
75 | * @last_can_queue_ramp_up_time: ramp up time | |
76 | * @max_can_queue: max can_queue size | |
3a3b42bf | 77 | */ |
42e9a92f | 78 | struct fc_fcp_internal { |
c1ecb90a CL |
79 | mempool_t *scsi_pkt_pool; |
80 | spinlock_t scsi_queue_lock; | |
81 | struct list_head scsi_pkt_queue; | |
82 | unsigned long last_can_queue_ramp_down_time; | |
83 | unsigned long last_can_queue_ramp_up_time; | |
84 | int max_can_queue; | |
42e9a92f RL |
85 | }; |
86 | ||
87 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
88 | ||
89 | /* | |
90 | * function prototypes | |
91 | * FC scsi I/O related functions | |
92 | */ | |
93 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
94 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
95 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
96 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
97 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 98 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
ac17ea8d | 99 | static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); |
3a3b42bf | 100 | static void fc_fcp_timeout(unsigned long); |
42e9a92f RL |
101 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
102 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
103 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
104 | static void fc_io_compl(struct fc_fcp_pkt *); | |
105 | ||
106 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
107 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
108 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
109 | ||
110 | /* | |
111 | * command status codes | |
112 | */ | |
113 | #define FC_COMPLETE 0 | |
114 | #define FC_CMD_ABORTED 1 | |
115 | #define FC_CMD_RESET 2 | |
116 | #define FC_CMD_PLOGO 3 | |
117 | #define FC_SNS_RCV 4 | |
118 | #define FC_TRANS_ERR 5 | |
119 | #define FC_DATA_OVRRUN 6 | |
120 | #define FC_DATA_UNDRUN 7 | |
121 | #define FC_ERROR 8 | |
122 | #define FC_HRD_ERROR 9 | |
ac17ea8d | 123 | #define FC_CRC_ERROR 10 |
124 | #define FC_TIMED_OUT 11 | |
42e9a92f RL |
125 | |
126 | /* | |
127 | * Error recovery timeout values. | |
128 | */ | |
42e9a92f | 129 | #define FC_SCSI_TM_TOV (10 * HZ) |
42e9a92f | 130 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
84c3e1ad | 131 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
42e9a92f RL |
132 | |
133 | #define FC_MAX_ERROR_CNT 5 | |
134 | #define FC_MAX_RECOV_RETRY 3 | |
135 | ||
136 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
137 | ||
138 | /** | |
3a3b42bf RL |
139 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
140 | * @lport: The local port that the FCP packet is for | |
141 | * @gfp: GFP flags for allocation | |
42e9a92f | 142 | * |
3a3b42bf RL |
143 | * Return value: fcp_pkt structure or null on allocation failure. |
144 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 145 | */ |
3a3b42bf | 146 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 147 | { |
3a3b42bf | 148 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
149 | struct fc_fcp_pkt *fsp; |
150 | ||
151 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
152 | if (fsp) { | |
153 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 154 | fsp->lp = lport; |
f56635a8 | 155 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
156 | atomic_set(&fsp->ref_cnt, 1); |
157 | init_timer(&fsp->timer); | |
76ffe8a3 | 158 | fsp->timer.data = (unsigned long)fsp; |
42e9a92f RL |
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 | |
f2817ec2 | 249 | * @delay: The timeout period in jiffies |
3a3b42bf | 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 | 315 | */ |
6a716a85 | 316 | void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) |
b277d2aa | 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 | |
84c3e1ad VD |
336 | */ |
337 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) | |
338 | { | |
339 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
9c8cce8e | 340 | unsigned long flags; |
84c3e1ad VD |
341 | int can_queue; |
342 | ||
9c8cce8e RL |
343 | spin_lock_irqsave(lport->host->host_lock, flags); |
344 | ||
84c3e1ad VD |
345 | if (si->last_can_queue_ramp_up_time && |
346 | (time_before(jiffies, si->last_can_queue_ramp_up_time + | |
347 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 348 | goto unlock; |
84c3e1ad VD |
349 | |
350 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
351 | FC_CAN_QUEUE_PERIOD)) | |
9c8cce8e | 352 | goto unlock; |
84c3e1ad VD |
353 | |
354 | si->last_can_queue_ramp_up_time = jiffies; | |
355 | ||
356 | can_queue = lport->host->can_queue << 1; | |
357 | if (can_queue >= si->max_can_queue) { | |
358 | can_queue = si->max_can_queue; | |
359 | si->last_can_queue_ramp_down_time = 0; | |
360 | } | |
361 | lport->host->can_queue = can_queue; | |
362 | shost_printk(KERN_ERR, lport->host, "libfc: increased " | |
363 | "can_queue to %d.\n", can_queue); | |
9c8cce8e RL |
364 | |
365 | unlock: | |
366 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
84c3e1ad VD |
367 | } |
368 | ||
c46be11a VD |
369 | /** |
370 | * fc_fcp_can_queue_ramp_down() - reduces can_queue | |
371 | * @lport: lport to reduce can_queue | |
372 | * | |
373 | * If we are getting memory allocation failures, then we may | |
374 | * be trying to execute too many commands. We let the running | |
375 | * commands complete or timeout, then try again with a reduced | |
376 | * can_queue. Eventually we will hit the point where we run | |
377 | * on all reserved structs. | |
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); | |
9c8cce8e | 382 | unsigned long flags; |
c46be11a VD |
383 | int can_queue; |
384 | ||
9c8cce8e RL |
385 | spin_lock_irqsave(lport->host->host_lock, flags); |
386 | ||
84c3e1ad VD |
387 | if (si->last_can_queue_ramp_down_time && |
388 | (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
389 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 390 | goto unlock; |
84c3e1ad VD |
391 | |
392 | si->last_can_queue_ramp_down_time = jiffies; | |
c46be11a VD |
393 | |
394 | can_queue = lport->host->can_queue; | |
395 | can_queue >>= 1; | |
396 | if (!can_queue) | |
397 | can_queue = 1; | |
398 | lport->host->can_queue = can_queue; | |
399 | shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" | |
400 | "Reducing can_queue to %d.\n", can_queue); | |
9c8cce8e RL |
401 | |
402 | unlock: | |
403 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
c46be11a VD |
404 | } |
405 | ||
406 | /* | |
407 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. | |
408 | * @lport: fc lport struct | |
409 | * @len: payload length | |
410 | * | |
411 | * Allocates fc_frame structure and buffer but if fails to allocate | |
412 | * then reduce can_queue. | |
413 | */ | |
414 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, | |
415 | size_t len) | |
416 | { | |
417 | struct fc_frame *fp; | |
418 | ||
419 | fp = fc_frame_alloc(lport, len); | |
c1ecb90a CL |
420 | if (likely(fp)) |
421 | return fp; | |
422 | ||
423 | /* error case */ | |
c1ecb90a | 424 | fc_fcp_can_queue_ramp_down(lport); |
c1ecb90a | 425 | return NULL; |
c46be11a VD |
426 | } |
427 | ||
3a3b42bf RL |
428 | /** |
429 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
430 | * @fsp: The FCP packet the data is on | |
431 | * @fp: The data frame | |
42e9a92f RL |
432 | */ |
433 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
434 | { | |
435 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 436 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
437 | struct fcoe_dev_stats *stats; |
438 | struct fc_frame_header *fh; | |
439 | size_t start_offset; | |
440 | size_t offset; | |
441 | u32 crc; | |
442 | u32 copy_len = 0; | |
443 | size_t len; | |
444 | void *buf; | |
445 | struct scatterlist *sg; | |
58682874 | 446 | u32 nents; |
ac17ea8d | 447 | u8 host_bcode = FC_COMPLETE; |
42e9a92f RL |
448 | |
449 | fh = fc_frame_header_get(fp); | |
450 | offset = ntohl(fh->fh_parm_offset); | |
451 | start_offset = offset; | |
452 | len = fr_len(fp) - sizeof(*fh); | |
453 | buf = fc_frame_payload_get(fp, 0); | |
454 | ||
5c12c418 | 455 | /* |
ac17ea8d | 456 | * if this I/O is ddped then clear it and initiate recovery since data |
457 | * frames are expected to be placed directly in that case. | |
458 | * | |
459 | * Indicate error to scsi-ml because something went wrong with the | |
460 | * ddp handling to get us here. | |
5c12c418 VD |
461 | */ |
462 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { | |
463 | fc_fcp_ddp_done(fsp); | |
ac17ea8d | 464 | FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); |
465 | host_bcode = FC_ERROR; | |
5c12c418 VD |
466 | goto err; |
467 | } | |
42e9a92f | 468 | if (offset + len > fsp->data_len) { |
34f42a07 | 469 | /* this should never happen */ |
42e9a92f RL |
470 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
471 | fc_frame_crc_check(fp)) | |
472 | goto crc_err; | |
7414705e RL |
473 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
474 | "data_len %x\n", len, offset, fsp->data_len); | |
ac17ea8d | 475 | |
476 | /* Data is corrupted indicate scsi-ml should retry */ | |
477 | host_bcode = FC_DATA_OVRRUN; | |
5c12c418 | 478 | goto err; |
42e9a92f RL |
479 | } |
480 | if (offset != fsp->xfer_len) | |
481 | fsp->state |= FC_SRB_DISCONTIG; | |
482 | ||
42e9a92f | 483 | sg = scsi_sglist(sc); |
58682874 | 484 | nents = scsi_sg_count(sc); |
42e9a92f | 485 | |
58682874 RL |
486 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
487 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 488 | &offset, NULL); |
58682874 RL |
489 | } else { |
490 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
491 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 492 | &offset, &crc); |
42e9a92f | 493 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 494 | if (len % 4) |
42e9a92f | 495 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
496 | |
497 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
498 | crc_err: | |
f018b73a | 499 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f | 500 | stats->ErrorFrames++; |
f018b73a | 501 | /* per cpu count, not total count, but OK for limit */ |
688fd364 | 502 | if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) |
7414705e | 503 | printk(KERN_WARNING "libfc: CRC error on data " |
ce8b5df0 | 504 | "frame for port (%6.6x)\n", |
7b2787ec | 505 | lport->port_id); |
f018b73a | 506 | put_cpu(); |
42e9a92f RL |
507 | /* |
508 | * Assume the frame is total garbage. | |
509 | * We may have copied it over the good part | |
510 | * of the buffer. | |
511 | * If so, we need to retry the entire operation. | |
512 | * Otherwise, ignore it. | |
513 | */ | |
ac17ea8d | 514 | if (fsp->state & FC_SRB_DISCONTIG) { |
515 | host_bcode = FC_CRC_ERROR; | |
5c12c418 | 516 | goto err; |
ac17ea8d | 517 | } |
42e9a92f RL |
518 | return; |
519 | } | |
520 | } | |
521 | ||
522 | if (fsp->xfer_contig_end == start_offset) | |
523 | fsp->xfer_contig_end += copy_len; | |
524 | fsp->xfer_len += copy_len; | |
525 | ||
526 | /* | |
527 | * In the very rare event that this data arrived after the response | |
528 | * and completes the transfer, call the completion handler. | |
529 | */ | |
530 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
531 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
532 | fc_fcp_complete_locked(fsp); | |
5c12c418 VD |
533 | return; |
534 | err: | |
ac17ea8d | 535 | fc_fcp_recovery(fsp, host_bcode); |
42e9a92f RL |
536 | } |
537 | ||
34f42a07 | 538 | /** |
3a3b42bf RL |
539 | * fc_fcp_send_data() - Send SCSI data to a target |
540 | * @fsp: The FCP packet the data is on | |
541 | * @sp: The sequence the data is to be sent on | |
542 | * @offset: The starting offset for this data request | |
543 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
544 | * |
545 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf | 546 | * If the LLD is capable of sequence offload then send down the |
9ddc5b6f | 547 | * seq_blen amount of data in single frame, otherwise send |
3a3b42bf RL |
548 | * multiple frames of the maximum frame payload supported by |
549 | * the target port. | |
42e9a92f RL |
550 | */ |
551 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
552 | size_t offset, size_t seq_blen) | |
553 | { | |
554 | struct fc_exch *ep; | |
555 | struct scsi_cmnd *sc; | |
556 | struct scatterlist *sg; | |
557 | struct fc_frame *fp = NULL; | |
3a3b42bf | 558 | struct fc_lport *lport = fsp->lp; |
18fa11ef | 559 | struct page *page; |
42e9a92f RL |
560 | size_t remaining; |
561 | size_t t_blen; | |
562 | size_t tlen; | |
563 | size_t sg_bytes; | |
564 | size_t frame_offset, fh_parm_offset; | |
18fa11ef | 565 | size_t off; |
42e9a92f RL |
566 | int error; |
567 | void *data = NULL; | |
568 | void *page_addr; | |
3a3b42bf | 569 | int using_sg = lport->sg_supp; |
42e9a92f RL |
570 | u32 f_ctl; |
571 | ||
572 | WARN_ON(seq_blen <= 0); | |
573 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
574 | /* this should never happen */ | |
7414705e RL |
575 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
576 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
577 | fc_fcp_send_abort(fsp); |
578 | return 0; | |
579 | } else if (offset != fsp->xfer_len) { | |
580 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
581 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
582 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
583 | } |
584 | ||
585 | /* | |
586 | * if LLD is capable of seq_offload then set transport | |
587 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
588 | * to max FC frame payload previously set in fsp->max_payload. | |
589 | */ | |
276d6814 | 590 | t_blen = fsp->max_payload; |
3a3b42bf RL |
591 | if (lport->seq_offload) { |
592 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 593 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 594 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
595 | } |
596 | ||
42e9a92f RL |
597 | if (t_blen > 512) |
598 | t_blen &= ~(512 - 1); /* round down to block size */ | |
42e9a92f RL |
599 | sc = fsp->cmd; |
600 | ||
601 | remaining = seq_blen; | |
602 | fh_parm_offset = frame_offset = offset; | |
603 | tlen = 0; | |
3a3b42bf | 604 | seq = lport->tt.seq_start_next(seq); |
42e9a92f RL |
605 | f_ctl = FC_FC_REL_OFF; |
606 | WARN_ON(!seq); | |
607 | ||
42e9a92f RL |
608 | sg = scsi_sglist(sc); |
609 | ||
610 | while (remaining > 0 && sg) { | |
611 | if (offset >= sg->length) { | |
612 | offset -= sg->length; | |
613 | sg = sg_next(sg); | |
614 | continue; | |
615 | } | |
616 | if (!fp) { | |
617 | tlen = min(t_blen, remaining); | |
618 | ||
619 | /* | |
620 | * TODO. Temporary workaround. fc_seq_send() can't | |
621 | * handle odd lengths in non-linear skbs. | |
622 | * This will be the final fragment only. | |
623 | */ | |
624 | if (tlen % 4) | |
625 | using_sg = 0; | |
a7bbc7f4 VD |
626 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
627 | if (!fp) | |
628 | return -ENOMEM; | |
629 | ||
630 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
631 | fh_parm_offset = frame_offset; |
632 | fr_max_payload(fp) = fsp->max_payload; | |
633 | } | |
18fa11ef CL |
634 | |
635 | off = offset + sg->offset; | |
42e9a92f | 636 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
637 | sg_bytes = min(sg_bytes, |
638 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
639 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 640 | if (using_sg) { |
18fa11ef | 641 | get_page(page); |
42e9a92f RL |
642 | skb_fill_page_desc(fp_skb(fp), |
643 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 644 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
645 | fp_skb(fp)->data_len += sg_bytes; |
646 | fr_len(fp) += sg_bytes; | |
647 | fp_skb(fp)->truesize += PAGE_SIZE; | |
648 | } else { | |
42e9a92f RL |
649 | /* |
650 | * The scatterlist item may be bigger than PAGE_SIZE, | |
651 | * but we must not cross pages inside the kmap. | |
652 | */ | |
77dfce07 | 653 | page_addr = kmap_atomic(page); |
42e9a92f RL |
654 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
655 | sg_bytes); | |
77dfce07 | 656 | kunmap_atomic(page_addr); |
42e9a92f RL |
657 | data += sg_bytes; |
658 | } | |
659 | offset += sg_bytes; | |
660 | frame_offset += sg_bytes; | |
661 | tlen -= sg_bytes; | |
662 | remaining -= sg_bytes; | |
663 | ||
d37322a4 YZ |
664 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
665 | (tlen)) | |
42e9a92f RL |
666 | continue; |
667 | ||
668 | /* | |
669 | * Send sequence with transfer sequence initiative in case | |
670 | * this is last FCP frame of the sequence. | |
671 | */ | |
672 | if (remaining == 0) | |
673 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
674 | ||
675 | ep = fc_seq_exch(seq); | |
676 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
677 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
678 | ||
679 | /* | |
680 | * send fragment using for a sequence. | |
681 | */ | |
3a3b42bf | 682 | error = lport->tt.seq_send(lport, seq, fp); |
42e9a92f RL |
683 | if (error) { |
684 | WARN_ON(1); /* send error should be rare */ | |
8467b96c | 685 | return error; |
42e9a92f RL |
686 | } |
687 | fp = NULL; | |
688 | } | |
689 | fsp->xfer_len += seq_blen; /* premature count? */ | |
690 | return 0; | |
691 | } | |
692 | ||
3a3b42bf | 693 | /** |
547fb12b | 694 | * fc_fcp_abts_resp() - Receive an ABTS response |
3a3b42bf RL |
695 | * @fsp: The FCP packet that is being aborted |
696 | * @fp: The response frame | |
697 | */ | |
42e9a92f RL |
698 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
699 | { | |
700 | int ba_done = 1; | |
701 | struct fc_ba_rjt *brp; | |
702 | struct fc_frame_header *fh; | |
703 | ||
704 | fh = fc_frame_header_get(fp); | |
705 | switch (fh->fh_r_ctl) { | |
706 | case FC_RCTL_BA_ACC: | |
707 | break; | |
708 | case FC_RCTL_BA_RJT: | |
709 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
710 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
711 | break; | |
712 | /* fall thru */ | |
713 | default: | |
714 | /* | |
715 | * we will let the command timeout | |
716 | * and scsi-ml recover in this case, | |
717 | * therefore cleared the ba_done flag. | |
718 | */ | |
719 | ba_done = 0; | |
720 | } | |
721 | ||
722 | if (ba_done) { | |
723 | fsp->state |= FC_SRB_ABORTED; | |
724 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
725 | ||
726 | if (fsp->wait_for_comp) | |
727 | complete(&fsp->tm_done); | |
728 | else | |
729 | fc_fcp_complete_locked(fsp); | |
730 | } | |
731 | } | |
732 | ||
34f42a07 | 733 | /** |
547fb12b | 734 | * fc_fcp_recv() - Receive an FCP frame |
34f42a07 | 735 | * @seq: The sequence the frame is on |
3a3b42bf | 736 | * @fp: The received frame |
34f42a07 | 737 | * @arg: The related FCP packet |
42e9a92f | 738 | * |
3a3b42bf RL |
739 | * Context: Called from Soft IRQ context. Can not be called |
740 | * holding the FCP packet list lock. | |
42e9a92f RL |
741 | */ |
742 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
743 | { | |
744 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 745 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
746 | struct fc_frame_header *fh; |
747 | struct fcp_txrdy *dd; | |
748 | u8 r_ctl; | |
749 | int rc = 0; | |
750 | ||
c46be11a VD |
751 | if (IS_ERR(fp)) { |
752 | fc_fcp_error(fsp, fp); | |
753 | return; | |
754 | } | |
42e9a92f RL |
755 | |
756 | fh = fc_frame_header_get(fp); | |
757 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 758 | |
1c4bfe63 | 759 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
760 | goto out; |
761 | if (fc_fcp_lock_pkt(fsp)) | |
762 | goto out; | |
42e9a92f RL |
763 | |
764 | if (fh->fh_type == FC_TYPE_BLS) { | |
765 | fc_fcp_abts_resp(fsp, fp); | |
766 | goto unlock; | |
767 | } | |
768 | ||
769 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
770 | goto unlock; | |
771 | ||
772 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
773 | /* | |
774 | * received XFER RDY from the target | |
775 | * need to send data to the target | |
776 | */ | |
777 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
778 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
779 | WARN_ON(!dd); | |
780 | ||
781 | rc = fc_fcp_send_data(fsp, seq, | |
782 | (size_t) ntohl(dd->ft_data_ro), | |
783 | (size_t) ntohl(dd->ft_burst_len)); | |
784 | if (!rc) | |
785 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
786 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
787 | /* | |
788 | * received a DATA frame | |
789 | * next we will copy the data to the system buffer | |
790 | */ | |
791 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
792 | fc_fcp_recv_data(fsp, fp); | |
793 | seq->rec_data = fsp->xfer_contig_end; | |
794 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
795 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
796 | ||
797 | fc_fcp_resp(fsp, fp); | |
798 | } else { | |
7414705e | 799 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
800 | } |
801 | unlock: | |
802 | fc_fcp_unlock_pkt(fsp); | |
803 | out: | |
804 | fc_frame_free(fp); | |
42e9a92f RL |
805 | } |
806 | ||
3a3b42bf RL |
807 | /** |
808 | * fc_fcp_resp() - Handler for FCP responses | |
809 | * @fsp: The FCP packet the response is for | |
810 | * @fp: The response frame | |
811 | */ | |
42e9a92f RL |
812 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
813 | { | |
814 | struct fc_frame_header *fh; | |
815 | struct fcp_resp *fc_rp; | |
816 | struct fcp_resp_ext *rp_ex; | |
817 | struct fcp_resp_rsp_info *fc_rp_info; | |
818 | u32 plen; | |
819 | u32 expected_len; | |
820 | u32 respl = 0; | |
821 | u32 snsl = 0; | |
822 | u8 flags = 0; | |
823 | ||
824 | plen = fr_len(fp); | |
825 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
826 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
827 | goto len_err; | |
828 | plen -= sizeof(*fh); | |
829 | fc_rp = (struct fcp_resp *)(fh + 1); | |
830 | fsp->cdb_status = fc_rp->fr_status; | |
831 | flags = fc_rp->fr_flags; | |
832 | fsp->scsi_comp_flags = flags; | |
833 | expected_len = fsp->data_len; | |
834 | ||
b277d2aa YZ |
835 | /* if ddp, update xfer len */ |
836 | fc_fcp_ddp_done(fsp); | |
837 | ||
42e9a92f RL |
838 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
839 | rp_ex = (void *)(fc_rp + 1); | |
840 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
841 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
842 | goto len_err; | |
843 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
844 | if (flags & FCP_RSP_LEN_VAL) { | |
845 | respl = ntohl(rp_ex->fr_rsp_len); | |
846 | if (respl != sizeof(*fc_rp_info)) | |
847 | goto len_err; | |
848 | if (fsp->wait_for_comp) { | |
849 | /* Abuse cdb_status for rsp code */ | |
850 | fsp->cdb_status = fc_rp_info->rsp_code; | |
851 | complete(&fsp->tm_done); | |
852 | /* | |
853 | * tmfs will not have any scsi cmd so | |
854 | * exit here | |
855 | */ | |
856 | return; | |
63ac4bbf | 857 | } |
42e9a92f RL |
858 | } |
859 | if (flags & FCP_SNS_LEN_VAL) { | |
860 | snsl = ntohl(rp_ex->fr_sns_len); | |
861 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
862 | snsl = SCSI_SENSE_BUFFERSIZE; | |
863 | memcpy(fsp->cmd->sense_buffer, | |
864 | (char *)fc_rp_info + respl, snsl); | |
865 | } | |
866 | } | |
867 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
868 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
869 | goto len_err; | |
870 | if (flags & FCP_RESID_UNDER) { | |
871 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
872 | /* | |
873 | * The cmnd->underflow is the minimum number of | |
25985edc | 874 | * bytes that must be transferred for this |
42e9a92f RL |
875 | * command. Provided a sense condition is not |
876 | * present, make sure the actual amount | |
877 | * transferred is at least the underflow value | |
878 | * or fail. | |
879 | */ | |
880 | if (!(flags & FCP_SNS_LEN_VAL) && | |
881 | (fc_rp->fr_status == 0) && | |
882 | (scsi_bufflen(fsp->cmd) - | |
883 | fsp->scsi_resid) < fsp->cmd->underflow) | |
884 | goto err; | |
885 | expected_len -= fsp->scsi_resid; | |
886 | } else { | |
887 | fsp->status_code = FC_ERROR; | |
888 | } | |
889 | } | |
890 | } | |
891 | fsp->state |= FC_SRB_RCV_STATUS; | |
892 | ||
893 | /* | |
894 | * Check for missing or extra data frames. | |
895 | */ | |
896 | if (unlikely(fsp->xfer_len != expected_len)) { | |
897 | if (fsp->xfer_len < expected_len) { | |
898 | /* | |
899 | * Some data may be queued locally, | |
900 | * Wait a at least one jiffy to see if it is delivered. | |
901 | * If this expires without data, we may do SRR. | |
902 | */ | |
903 | fc_fcp_timer_set(fsp, 2); | |
904 | return; | |
905 | } | |
906 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 907 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
908 | "len %x, data len %x\n", |
909 | fsp->rport->port_id, | |
910 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
911 | } |
912 | fc_fcp_complete_locked(fsp); | |
913 | return; | |
914 | ||
915 | len_err: | |
7414705e RL |
916 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
917 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
918 | err: |
919 | fsp->status_code = FC_ERROR; | |
920 | fc_fcp_complete_locked(fsp); | |
921 | } | |
922 | ||
923 | /** | |
3a3b42bf RL |
924 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
925 | * fcp_pkt lock held | |
926 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
927 | * |
928 | * This function may sleep if a timer is pending. The packet lock must be | |
929 | * held, and the host lock must not be held. | |
930 | */ | |
931 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
932 | { | |
3a3b42bf | 933 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
934 | struct fc_seq *seq; |
935 | struct fc_exch *ep; | |
936 | u32 f_ctl; | |
937 | ||
938 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
939 | return; | |
940 | ||
941 | if (fsp->state & FC_SRB_ABORTED) { | |
942 | if (!fsp->status_code) | |
943 | fsp->status_code = FC_CMD_ABORTED; | |
944 | } else { | |
945 | /* | |
946 | * Test for transport underrun, independent of response | |
947 | * underrun status. | |
948 | */ | |
949 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
950 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
951 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
952 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 953 | fsp->io_status = 0; |
42e9a92f RL |
954 | } |
955 | } | |
956 | ||
957 | seq = fsp->seq_ptr; | |
958 | if (seq) { | |
959 | fsp->seq_ptr = NULL; | |
960 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
961 | struct fc_frame *conf_frame; | |
962 | struct fc_seq *csp; | |
963 | ||
3a3b42bf | 964 | csp = lport->tt.seq_start_next(seq); |
c46be11a | 965 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
966 | if (conf_frame) { |
967 | f_ctl = FC_FC_SEQ_INIT; | |
968 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
969 | ep = fc_seq_exch(seq); | |
970 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
971 | ep->did, ep->sid, | |
972 | FC_TYPE_FCP, f_ctl, 0); | |
3a3b42bf | 973 | lport->tt.seq_send(lport, csp, conf_frame); |
42e9a92f RL |
974 | } |
975 | } | |
3a3b42bf | 976 | lport->tt.exch_done(seq); |
42e9a92f | 977 | } |
d889b30a YZ |
978 | /* |
979 | * Some resets driven by SCSI are not I/Os and do not have | |
980 | * SCSI commands associated with the requests. We should not | |
981 | * call I/O completion if we do not have a SCSI command. | |
982 | */ | |
983 | if (fsp->cmd) | |
984 | fc_io_compl(fsp); | |
42e9a92f RL |
985 | } |
986 | ||
3a3b42bf RL |
987 | /** |
988 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
989 | * @fsp: The FCP packet whose exchanges should be canceled | |
990 | * @error: The reason for the cancellation | |
991 | */ | |
42e9a92f RL |
992 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
993 | { | |
3a3b42bf | 994 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
995 | |
996 | if (fsp->seq_ptr) { | |
3a3b42bf | 997 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
998 | fsp->seq_ptr = NULL; |
999 | } | |
1000 | fsp->status_code = error; | |
1001 | } | |
1002 | ||
1003 | /** | |
3a3b42bf RL |
1004 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
1005 | * @lport: The local port whose exchanges should be canceled | |
1006 | * @id: The target's ID | |
1007 | * @lun: The LUN | |
1008 | * @error: The reason for cancellation | |
42e9a92f RL |
1009 | * |
1010 | * If lun or id is -1, they are ignored. | |
1011 | */ | |
3a3b42bf | 1012 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
1013 | unsigned int lun, int error) |
1014 | { | |
3a3b42bf | 1015 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
1016 | struct fc_fcp_pkt *fsp; |
1017 | struct scsi_cmnd *sc_cmd; | |
1018 | unsigned long flags; | |
1019 | ||
c1ecb90a | 1020 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1021 | restart: |
1022 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1023 | sc_cmd = fsp->cmd; | |
1024 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1025 | continue; | |
1026 | ||
1027 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1028 | continue; | |
1029 | ||
1030 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1031 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1032 | |
1033 | if (!fc_fcp_lock_pkt(fsp)) { | |
1034 | fc_fcp_cleanup_cmd(fsp, error); | |
1035 | fc_io_compl(fsp); | |
1036 | fc_fcp_unlock_pkt(fsp); | |
1037 | } | |
1038 | ||
1039 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1040 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1041 | /* |
1042 | * while we dropped the lock multiple pkts could | |
1043 | * have been released, so we have to start over. | |
1044 | */ | |
1045 | goto restart; | |
1046 | } | |
c1ecb90a | 1047 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1048 | } |
1049 | ||
3a3b42bf RL |
1050 | /** |
1051 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1052 | * @lport: The local port whose exchanges are to be aborted | |
1053 | */ | |
1054 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1055 | { |
3a3b42bf | 1056 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1057 | } |
1058 | ||
1059 | /** | |
3a3b42bf RL |
1060 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1061 | * @lport: The local port to send the FCP packet on | |
1062 | * @fsp: The FCP packet to send | |
42e9a92f | 1063 | * |
3a3b42bf | 1064 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1065 | * Locks: Called without locks held |
42e9a92f | 1066 | */ |
3a3b42bf | 1067 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1068 | { |
3a3b42bf | 1069 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1070 | unsigned long flags; |
42e9a92f RL |
1071 | int rc; |
1072 | ||
1073 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1074 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1075 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1076 | ||
1077 | int_to_scsilun(fsp->cmd->device->lun, | |
1078 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1079 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
42e9a92f | 1080 | |
c1ecb90a CL |
1081 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1082 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1083 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1084 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1085 | if (unlikely(rc)) { |
1086 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
c9d24a76 | 1087 | fsp->cmd->SCp.ptr = NULL; |
42e9a92f | 1088 | list_del(&fsp->list); |
c1ecb90a CL |
1089 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1090 | } | |
42e9a92f RL |
1091 | |
1092 | return rc; | |
1093 | } | |
1094 | ||
e0883a3c | 1095 | /** |
1096 | * get_fsp_rec_tov() - Helper function to get REC_TOV | |
1097 | * @fsp: the FCP packet | |
f2817ec2 VD |
1098 | * |
1099 | * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second | |
e0883a3c | 1100 | */ |
1101 | static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) | |
1102 | { | |
f2817ec2 | 1103 | struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; |
e0883a3c | 1104 | |
f2817ec2 | 1105 | return msecs_to_jiffies(rpriv->e_d_tov) + HZ; |
e0883a3c | 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; | |
1125 | ||
1126 | if (fc_fcp_lock_pkt(fsp)) | |
1127 | return 0; | |
1128 | ||
c46be11a | 1129 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1130 | if (!fp) { |
1131 | rc = -1; | |
1132 | goto unlock; | |
1133 | } | |
1134 | ||
1135 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1136 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1137 | rport = fsp->rport; |
1138 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1139 | rpriv = rport->dd_data; |
42e9a92f RL |
1140 | |
1141 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
7b2787ec | 1142 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1143 | FC_FCTL_REQ, 0); |
42e9a92f | 1144 | |
3a3b42bf RL |
1145 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
1146 | fsp, 0); | |
42e9a92f | 1147 | if (!seq) { |
42e9a92f RL |
1148 | rc = -1; |
1149 | goto unlock; | |
1150 | } | |
42e9a92f RL |
1151 | fsp->seq_ptr = seq; |
1152 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1153 | ||
1154 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); | |
05fee645 | 1155 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
f2817ec2 | 1156 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
05fee645 | 1157 | |
42e9a92f RL |
1158 | unlock: |
1159 | fc_fcp_unlock_pkt(fsp); | |
1160 | return rc; | |
1161 | } | |
1162 | ||
3a3b42bf RL |
1163 | /** |
1164 | * fc_fcp_error() - Handler for FCP layer errors | |
1165 | * @fsp: The FCP packet the error is on | |
1166 | * @fp: The frame that has errored | |
42e9a92f RL |
1167 | */ |
1168 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1169 | { | |
1170 | int error = PTR_ERR(fp); | |
1171 | ||
1172 | if (fc_fcp_lock_pkt(fsp)) | |
1173 | return; | |
1174 | ||
7414705e | 1175 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1176 | fc_fcp_retry_cmd(fsp); |
1177 | goto unlock; | |
42e9a92f | 1178 | } |
7414705e | 1179 | |
42e9a92f RL |
1180 | /* |
1181 | * clear abort pending, because the lower layer | |
1182 | * decided to force completion. | |
1183 | */ | |
1184 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1185 | fsp->status_code = FC_CMD_PLOGO; | |
1186 | fc_fcp_complete_locked(fsp); | |
1187 | unlock: | |
1188 | fc_fcp_unlock_pkt(fsp); | |
1189 | } | |
1190 | ||
3a3b42bf RL |
1191 | /** |
1192 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1193 | * @fsp: The FCP packet to abort on | |
1194 | * | |
1195 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1196 | */ |
c340111d | 1197 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1198 | { |
1199 | int rc = FAILED; | |
fa79dbdb | 1200 | unsigned long ticks_left; |
42e9a92f RL |
1201 | |
1202 | if (fc_fcp_send_abort(fsp)) | |
1203 | return FAILED; | |
1204 | ||
1205 | init_completion(&fsp->tm_done); | |
1206 | fsp->wait_for_comp = 1; | |
1207 | ||
1208 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
fa79dbdb HD |
1209 | ticks_left = wait_for_completion_timeout(&fsp->tm_done, |
1210 | FC_SCSI_TM_TOV); | |
42e9a92f RL |
1211 | spin_lock_bh(&fsp->scsi_pkt_lock); |
1212 | fsp->wait_for_comp = 0; | |
1213 | ||
fa79dbdb | 1214 | if (!ticks_left) { |
7414705e | 1215 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f | 1216 | } else if (fsp->state & FC_SRB_ABORTED) { |
7414705e | 1217 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1218 | rc = SUCCESS; |
1219 | fc_fcp_complete_locked(fsp); | |
1220 | } | |
1221 | ||
1222 | return rc; | |
1223 | } | |
1224 | ||
3a3b42bf RL |
1225 | /** |
1226 | * fc_lun_reset_send() - Send LUN reset command | |
1227 | * @data: The FCP packet that identifies the LUN to be reset | |
42e9a92f RL |
1228 | */ |
1229 | static void fc_lun_reset_send(unsigned long data) | |
1230 | { | |
1231 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
3a3b42bf | 1232 | struct fc_lport *lport = fsp->lp; |
e0883a3c | 1233 | |
3a3b42bf | 1234 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { |
42e9a92f RL |
1235 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1236 | return; | |
1237 | if (fc_fcp_lock_pkt(fsp)) | |
1238 | return; | |
1239 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); | |
f2817ec2 | 1240 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1241 | fc_fcp_unlock_pkt(fsp); |
1242 | } | |
1243 | } | |
1244 | ||
3a3b42bf RL |
1245 | /** |
1246 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1247 | * and wait for the reply | |
b595076a | 1248 | * @lport: The local port to sent the command on |
3a3b42bf RL |
1249 | * @fsp: The FCP packet that identifies the LUN to be reset |
1250 | * @id: The SCSI command ID | |
1251 | * @lun: The LUN ID to be reset | |
42e9a92f | 1252 | */ |
3a3b42bf | 1253 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1254 | unsigned int id, unsigned int lun) |
1255 | { | |
1256 | int rc; | |
1257 | ||
1258 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1259 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1260 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1261 | ||
1262 | fsp->wait_for_comp = 1; | |
1263 | init_completion(&fsp->tm_done); | |
1264 | ||
1265 | fc_lun_reset_send((unsigned long)fsp); | |
1266 | ||
1267 | /* | |
1268 | * wait for completion of reset | |
1269 | * after that make sure all commands are terminated | |
1270 | */ | |
1271 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1272 | ||
1273 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1274 | fsp->state |= FC_SRB_COMPL; | |
1275 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1276 | ||
1277 | del_timer_sync(&fsp->timer); | |
1278 | ||
1279 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1280 | if (fsp->seq_ptr) { | |
3a3b42bf | 1281 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1282 | fsp->seq_ptr = NULL; |
1283 | } | |
1284 | fsp->wait_for_comp = 0; | |
1285 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1286 | ||
1287 | if (!rc) { | |
3a3b42bf | 1288 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1289 | return FAILED; |
1290 | } | |
1291 | ||
1292 | /* cdb_status holds the tmf's rsp code */ | |
1293 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1294 | return FAILED; | |
1295 | ||
3a3b42bf RL |
1296 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1297 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1298 | return SUCCESS; |
1299 | } | |
1300 | ||
3a3b42bf | 1301 | /** |
25985edc | 1302 | * fc_tm_done() - Task Management response handler |
3a3b42bf RL |
1303 | * @seq: The sequence that the response is on |
1304 | * @fp: The response frame | |
1305 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1306 | */ |
1307 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1308 | { | |
1309 | struct fc_fcp_pkt *fsp = arg; | |
1310 | struct fc_frame_header *fh; | |
1311 | ||
1312 | if (IS_ERR(fp)) { | |
1313 | /* | |
1314 | * If there is an error just let it timeout or wait | |
1315 | * for TMF to be aborted if it timedout. | |
1316 | * | |
1317 | * scsi-eh will escalate for when either happens. | |
1318 | */ | |
e4a9a982 | 1319 | return; |
42e9a92f RL |
1320 | } |
1321 | ||
1322 | if (fc_fcp_lock_pkt(fsp)) | |
b5fe5e95 | 1323 | goto out; |
42e9a92f RL |
1324 | |
1325 | /* | |
1326 | * raced with eh timeout handler. | |
1327 | */ | |
b5fe5e95 YZ |
1328 | if (!fsp->seq_ptr || !fsp->wait_for_comp) |
1329 | goto out_unlock; | |
42e9a92f RL |
1330 | |
1331 | fh = fc_frame_header_get(fp); | |
1332 | if (fh->fh_type != FC_TYPE_BLS) | |
1333 | fc_fcp_resp(fsp, fp); | |
1334 | fsp->seq_ptr = NULL; | |
1335 | fsp->lp->tt.exch_done(seq); | |
b5fe5e95 | 1336 | out_unlock: |
42e9a92f | 1337 | fc_fcp_unlock_pkt(fsp); |
b5fe5e95 YZ |
1338 | out: |
1339 | fc_frame_free(fp); | |
42e9a92f RL |
1340 | } |
1341 | ||
3a3b42bf RL |
1342 | /** |
1343 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1344 | * @lport: The local port to be cleaned up | |
1345 | */ | |
1346 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1347 | { |
3a3b42bf | 1348 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1349 | } |
1350 | ||
3a3b42bf RL |
1351 | /** |
1352 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
1353 | * @data: The FCP packet that has timed out | |
42e9a92f | 1354 | * |
3a3b42bf RL |
1355 | * If REC is supported then just issue it and return. The REC exchange will |
1356 | * complete or time out and recovery can continue at that point. Otherwise, | |
1357 | * if the response has been received without all the data it has been | |
1358 | * ER_TIMEOUT since the response was received. If the response has not been | |
1359 | * received we see if data was received recently. If it has been then we | |
1360 | * continue waiting, otherwise, we abort the command. | |
42e9a92f RL |
1361 | */ |
1362 | static void fc_fcp_timeout(unsigned long data) | |
1363 | { | |
1364 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1365 | struct fc_rport *rport = fsp->rport; | |
3a3b42bf | 1366 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1367 | |
1368 | if (fc_fcp_lock_pkt(fsp)) | |
1369 | return; | |
1370 | ||
1371 | if (fsp->cdb_cmd.fc_tm_flags) | |
1372 | goto unlock; | |
1373 | ||
1374 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1375 | ||
3a3b42bf | 1376 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
42e9a92f | 1377 | fc_fcp_rec(fsp); |
42e9a92f RL |
1378 | else if (fsp->state & FC_SRB_RCV_STATUS) |
1379 | fc_fcp_complete_locked(fsp); | |
1380 | else | |
ac17ea8d | 1381 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1382 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1383 | unlock: | |
1384 | fc_fcp_unlock_pkt(fsp); | |
1385 | } | |
1386 | ||
3a3b42bf RL |
1387 | /** |
1388 | * fc_fcp_rec() - Send a REC ELS request | |
1389 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1390 | */ |
1391 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1392 | { | |
3a3b42bf | 1393 | struct fc_lport *lport; |
42e9a92f RL |
1394 | struct fc_frame *fp; |
1395 | struct fc_rport *rport; | |
3a3b42bf | 1396 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1397 | |
3a3b42bf | 1398 | lport = fsp->lp; |
42e9a92f | 1399 | rport = fsp->rport; |
3a3b42bf RL |
1400 | rpriv = rport->dd_data; |
1401 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1402 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1403 | fsp->io_status = 0; |
42e9a92f RL |
1404 | fc_fcp_complete_locked(fsp); |
1405 | return; | |
1406 | } | |
e0883a3c | 1407 | |
c46be11a | 1408 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1409 | if (!fp) |
1410 | goto retry; | |
1411 | ||
1412 | fr_seq(fp) = fsp->seq_ptr; | |
1413 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
7b2787ec | 1414 | rpriv->local_port->port_id, FC_TYPE_ELS, |
24f089e2 | 1415 | FC_FCTL_REQ, 0); |
3a3b42bf RL |
1416 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1417 | fc_fcp_rec_resp, fsp, | |
3a91090f | 1418 | 2 * lport->r_a_tov)) { |
42e9a92f RL |
1419 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1420 | return; | |
1421 | } | |
42e9a92f RL |
1422 | retry: |
1423 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
3a91090f | 1424 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f | 1425 | else |
ac17ea8d | 1426 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1427 | } |
1428 | ||
3a3b42bf RL |
1429 | /** |
1430 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1431 | * @seq: The sequence the response is on | |
1432 | * @fp: The response frame | |
1433 | * @arg: The FCP packet the response is on | |
1434 | * | |
1435 | * If the response is a reject then the scsi layer will handle | |
1436 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1437 | * set the timeout and return. If the I/O was completed then complete the | |
1438 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1439 | */ |
1440 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1441 | { | |
1442 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1443 | struct fc_els_rec_acc *recp; | |
1444 | struct fc_els_ls_rjt *rjt; | |
1445 | u32 e_stat; | |
1446 | u8 opcode; | |
1447 | u32 offset; | |
1448 | enum dma_data_direction data_dir; | |
1449 | enum fc_rctl r_ctl; | |
3a3b42bf | 1450 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1451 | |
1452 | if (IS_ERR(fp)) { | |
1453 | fc_fcp_rec_error(fsp, fp); | |
1454 | return; | |
1455 | } | |
1456 | ||
1457 | if (fc_fcp_lock_pkt(fsp)) | |
1458 | goto out; | |
1459 | ||
1460 | fsp->recov_retry = 0; | |
1461 | opcode = fc_frame_payload_op(fp); | |
1462 | if (opcode == ELS_LS_RJT) { | |
1463 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1464 | switch (rjt->er_reason) { | |
1465 | default: | |
7414705e RL |
1466 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1467 | "reason %d expl %d\n", | |
1468 | fsp->rport->port_id, rjt->er_reason, | |
1469 | rjt->er_explan); | |
42e9a92f RL |
1470 | /* fall through */ |
1471 | case ELS_RJT_UNSUP: | |
7414705e | 1472 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1473 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1474 | /* |
1475 | * if we do not spport RECs or got some bogus | |
1476 | * reason then resetup timer so we check for | |
1477 | * making progress. | |
1478 | */ | |
3a3b42bf | 1479 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1480 | break; |
1481 | case ELS_RJT_LOGIC: | |
1482 | case ELS_RJT_UNAB: | |
1483 | /* | |
1484 | * If no data transfer, the command frame got dropped | |
1485 | * so we just retry. If data was transferred, we | |
1486 | * lost the response but the target has no record, | |
1487 | * so we abort and retry. | |
1488 | */ | |
1489 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1490 | fsp->xfer_len == 0) { | |
1491 | fc_fcp_retry_cmd(fsp); | |
1492 | break; | |
1493 | } | |
ac17ea8d | 1494 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1495 | break; |
1496 | } | |
1497 | } else if (opcode == ELS_LS_ACC) { | |
1498 | if (fsp->state & FC_SRB_ABORTED) | |
1499 | goto unlock_out; | |
1500 | ||
1501 | data_dir = fsp->cmd->sc_data_direction; | |
1502 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1503 | offset = ntohl(recp->reca_fc4value); | |
1504 | e_stat = ntohl(recp->reca_e_stat); | |
1505 | ||
1506 | if (e_stat & ESB_ST_COMPLETE) { | |
1507 | ||
1508 | /* | |
1509 | * The exchange is complete. | |
1510 | * | |
1511 | * For output, we must've lost the response. | |
1512 | * For input, all data must've been sent. | |
1513 | * We lost may have lost the response | |
1514 | * (and a confirmation was requested) and maybe | |
1515 | * some data. | |
1516 | * | |
1517 | * If all data received, send SRR | |
1518 | * asking for response. If partial data received, | |
1519 | * or gaps, SRR requests data at start of gap. | |
1520 | * Recovery via SRR relies on in-order-delivery. | |
1521 | */ | |
1522 | if (data_dir == DMA_TO_DEVICE) { | |
1523 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1524 | } else if (fsp->xfer_contig_end == offset) { | |
1525 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1526 | } else { | |
1527 | offset = fsp->xfer_contig_end; | |
1528 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1529 | } | |
1530 | fc_fcp_srr(fsp, r_ctl, offset); | |
1531 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
42e9a92f RL |
1532 | /* |
1533 | * The remote port has the initiative, so just | |
1534 | * keep waiting for it to complete. | |
1535 | */ | |
f2817ec2 | 1536 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1537 | } else { |
1538 | ||
1539 | /* | |
1540 | * The exchange is incomplete, we have seq. initiative. | |
1541 | * Lost response with requested confirmation, | |
1542 | * lost confirmation, lost transfer ready or | |
1543 | * lost write data. | |
1544 | * | |
1545 | * For output, if not all data was received, ask | |
1546 | * for transfer ready to be repeated. | |
1547 | * | |
1548 | * If we received or sent all the data, send SRR to | |
1549 | * request response. | |
1550 | * | |
1551 | * If we lost a response, we may have lost some read | |
1552 | * data as well. | |
1553 | */ | |
1554 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1555 | if (data_dir == DMA_TO_DEVICE) { | |
1556 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1557 | if (offset < fsp->data_len) | |
1558 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1559 | } else if (offset == fsp->xfer_contig_end) { | |
1560 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1561 | } else if (fsp->xfer_contig_end < offset) { | |
1562 | offset = fsp->xfer_contig_end; | |
1563 | } | |
1564 | fc_fcp_srr(fsp, r_ctl, offset); | |
1565 | } | |
1566 | } | |
1567 | unlock_out: | |
1568 | fc_fcp_unlock_pkt(fsp); | |
1569 | out: | |
1570 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1571 | fc_frame_free(fp); | |
1572 | } | |
1573 | ||
3a3b42bf RL |
1574 | /** |
1575 | * fc_fcp_rec_error() - Handler for REC errors | |
1576 | * @fsp: The FCP packet the error is on | |
1577 | * @fp: The REC frame | |
42e9a92f RL |
1578 | */ |
1579 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1580 | { | |
1581 | int error = PTR_ERR(fp); | |
1582 | ||
1583 | if (fc_fcp_lock_pkt(fsp)) | |
1584 | goto out; | |
1585 | ||
1586 | switch (error) { | |
1587 | case -FC_EX_CLOSED: | |
1588 | fc_fcp_retry_cmd(fsp); | |
1589 | break; | |
1590 | ||
1591 | default: | |
ce8b5df0 | 1592 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1593 | fsp, fsp->rport->port_id, error); |
42e9a92f RL |
1594 | fsp->status_code = FC_CMD_PLOGO; |
1595 | /* fall through */ | |
1596 | ||
1597 | case -FC_EX_TIMEOUT: | |
1598 | /* | |
1599 | * Assume REC or LS_ACC was lost. | |
1600 | * The exchange manager will have aborted REC, so retry. | |
1601 | */ | |
ce8b5df0 | 1602 | FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", |
7414705e RL |
1603 | fsp->rport->port_id, error, fsp->recov_retry, |
1604 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1605 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1606 | fc_fcp_rec(fsp); | |
1607 | else | |
ac17ea8d | 1608 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1609 | break; |
1610 | } | |
1611 | fc_fcp_unlock_pkt(fsp); | |
1612 | out: | |
1613 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1614 | } | |
1615 | ||
3a3b42bf | 1616 | /** |
5c12c418 VD |
1617 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1618 | * @fsp: The FCP pkt that needs to be aborted | |
42e9a92f | 1619 | */ |
ac17ea8d | 1620 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) |
42e9a92f | 1621 | { |
ac17ea8d | 1622 | fsp->status_code = code; |
42e9a92f RL |
1623 | fsp->cdb_status = 0; |
1624 | fsp->io_status = 0; | |
1625 | /* | |
1626 | * if this fails then we let the scsi command timer fire and | |
1627 | * scsi-ml escalate. | |
1628 | */ | |
1629 | fc_fcp_send_abort(fsp); | |
1630 | } | |
1631 | ||
3a3b42bf RL |
1632 | /** |
1633 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1634 | * @fsp: The FCP packet the SRR is to be sent on | |
1635 | * @r_ctl: The R_CTL field for the SRR request | |
42e9a92f RL |
1636 | * This is called after receiving status but insufficient data, or |
1637 | * when expecting status but the request has timed out. | |
1638 | */ | |
1639 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1640 | { | |
3a3b42bf | 1641 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1642 | struct fc_rport *rport; |
3a3b42bf | 1643 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1644 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1645 | struct fc_seq *seq; | |
1646 | struct fcp_srr *srr; | |
1647 | struct fc_frame *fp; | |
e0883a3c | 1648 | unsigned int rec_tov; |
42e9a92f RL |
1649 | |
1650 | rport = fsp->rport; | |
3a3b42bf | 1651 | rpriv = rport->dd_data; |
42e9a92f | 1652 | |
3a3b42bf RL |
1653 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1654 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1655 | goto retry; /* shouldn't happen */ |
c46be11a | 1656 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1657 | if (!fp) |
1658 | goto retry; | |
1659 | ||
1660 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1661 | memset(srr, 0, sizeof(*srr)); | |
1662 | srr->srr_op = ELS_SRR; | |
1663 | srr->srr_ox_id = htons(ep->oxid); | |
1664 | srr->srr_rx_id = htons(ep->rxid); | |
1665 | srr->srr_r_ctl = r_ctl; | |
1666 | srr->srr_rel_off = htonl(offset); | |
1667 | ||
1668 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
7b2787ec | 1669 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1670 | FC_FCTL_REQ, 0); |
42e9a92f | 1671 | |
e0883a3c | 1672 | rec_tov = get_fsp_rec_tov(fsp); |
0a219edb VD |
1673 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, |
1674 | fc_fcp_pkt_destroy, | |
e0883a3c | 1675 | fsp, jiffies_to_msecs(rec_tov)); |
8f550f93 | 1676 | if (!seq) |
42e9a92f | 1677 | goto retry; |
8f550f93 | 1678 | |
42e9a92f RL |
1679 | fsp->recov_seq = seq; |
1680 | fsp->xfer_len = offset; | |
1681 | fsp->xfer_contig_end = offset; | |
1682 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1683 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1684 | return; | |
1685 | retry: | |
1686 | fc_fcp_retry_cmd(fsp); | |
1687 | } | |
1688 | ||
3a3b42bf RL |
1689 | /** |
1690 | * fc_fcp_srr_resp() - Handler for SRR response | |
1691 | * @seq: The sequence the SRR is on | |
1692 | * @fp: The SRR frame | |
1693 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1694 | */ |
1695 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1696 | { | |
1697 | struct fc_fcp_pkt *fsp = arg; | |
1698 | struct fc_frame_header *fh; | |
1699 | ||
1700 | if (IS_ERR(fp)) { | |
1701 | fc_fcp_srr_error(fsp, fp); | |
1702 | return; | |
1703 | } | |
1704 | ||
1705 | if (fc_fcp_lock_pkt(fsp)) | |
1706 | goto out; | |
1707 | ||
1708 | fh = fc_frame_header_get(fp); | |
1709 | /* | |
1710 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1711 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1712 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1713 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1714 | * an abort response though. | |
1715 | */ | |
1716 | if (fh->fh_type == FC_TYPE_BLS) { | |
1717 | fc_fcp_unlock_pkt(fsp); | |
1718 | return; | |
1719 | } | |
1720 | ||
42e9a92f RL |
1721 | switch (fc_frame_payload_op(fp)) { |
1722 | case ELS_LS_ACC: | |
1723 | fsp->recov_retry = 0; | |
f2817ec2 | 1724 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1725 | break; |
1726 | case ELS_LS_RJT: | |
1727 | default: | |
ac17ea8d | 1728 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1729 | break; |
1730 | } | |
1731 | fc_fcp_unlock_pkt(fsp); | |
42e9a92f | 1732 | out: |
0a219edb | 1733 | fsp->lp->tt.exch_done(seq); |
42e9a92f | 1734 | fc_frame_free(fp); |
42e9a92f RL |
1735 | } |
1736 | ||
3a3b42bf RL |
1737 | /** |
1738 | * fc_fcp_srr_error() - Handler for SRR errors | |
1739 | * @fsp: The FCP packet that the SRR error is on | |
1740 | * @fp: The SRR frame | |
1741 | */ | |
42e9a92f RL |
1742 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1743 | { | |
1744 | if (fc_fcp_lock_pkt(fsp)) | |
1745 | goto out; | |
42e9a92f RL |
1746 | switch (PTR_ERR(fp)) { |
1747 | case -FC_EX_TIMEOUT: | |
1748 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1749 | fc_fcp_rec(fsp); | |
1750 | else | |
ac17ea8d | 1751 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1752 | break; |
1753 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1754 | /* fall through */ | |
1755 | default: | |
1756 | fc_fcp_retry_cmd(fsp); | |
1757 | break; | |
1758 | } | |
1759 | fc_fcp_unlock_pkt(fsp); | |
1760 | out: | |
0a219edb | 1761 | fsp->lp->tt.exch_done(fsp->recov_seq); |
42e9a92f RL |
1762 | } |
1763 | ||
3a3b42bf RL |
1764 | /** |
1765 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1766 | * @lport: The local port to be checked | |
1767 | */ | |
1768 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1769 | { |
1770 | /* lock ? */ | |
3a3b42bf RL |
1771 | return (lport->state == LPORT_ST_READY) && |
1772 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1773 | } |
1774 | ||
1775 | /** | |
3a3b42bf | 1776 | * fc_queuecommand() - The queuecommand function of the SCSI template |
04885b16 | 1777 | * @shost: The Scsi_Host that the command was issued to |
3a3b42bf | 1778 | * @cmd: The scsi_cmnd to be executed |
42e9a92f | 1779 | * |
04885b16 | 1780 | * This is the i/o strategy routine, called by the SCSI layer. |
42e9a92f | 1781 | */ |
04885b16 | 1782 | int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) |
42e9a92f | 1783 | { |
04885b16 | 1784 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
1785 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1786 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1787 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1788 | int rval; |
1789 | int rc = 0; | |
1790 | struct fcoe_dev_stats *stats; | |
1791 | ||
42e9a92f RL |
1792 | rval = fc_remote_port_chkready(rport); |
1793 | if (rval) { | |
1794 | sc_cmd->result = rval; | |
04885b16 | 1795 | sc_cmd->scsi_done(sc_cmd); |
be948fc3 | 1796 | return 0; |
42e9a92f RL |
1797 | } |
1798 | ||
1799 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1800 | /* | |
1801 | * rport is transitioning from blocked/deleted to | |
1802 | * online | |
1803 | */ | |
1804 | sc_cmd->result = DID_IMM_RETRY << 16; | |
04885b16 | 1805 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
1806 | goto out; |
1807 | } | |
1808 | ||
3a3b42bf | 1809 | rpriv = rport->dd_data; |
42e9a92f | 1810 | |
3a3b42bf | 1811 | if (!fc_fcp_lport_queue_ready(lport)) { |
84c3e1ad VD |
1812 | if (lport->qfull) |
1813 | fc_fcp_can_queue_ramp_down(lport); | |
42e9a92f RL |
1814 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1815 | goto out; | |
1816 | } | |
1817 | ||
3a3b42bf | 1818 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1819 | if (fsp == NULL) { |
1820 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1821 | goto out; | |
1822 | } | |
1823 | ||
1824 | /* | |
1825 | * build the libfc request pkt | |
1826 | */ | |
1827 | fsp->cmd = sc_cmd; /* save the cmd */ | |
42e9a92f | 1828 | fsp->rport = rport; /* set the remote port ptr */ |
42e9a92f RL |
1829 | |
1830 | /* | |
1831 | * set up the transfer length | |
1832 | */ | |
1833 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1834 | fsp->xfer_len = 0; | |
1835 | ||
1836 | /* | |
1837 | * setup the data direction | |
1838 | */ | |
f018b73a | 1839 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f RL |
1840 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1841 | fsp->req_flags = FC_SRB_READ; | |
1842 | stats->InputRequests++; | |
5f0e385f | 1843 | stats->InputBytes += fsp->data_len; |
42e9a92f RL |
1844 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
1845 | fsp->req_flags = FC_SRB_WRITE; | |
1846 | stats->OutputRequests++; | |
5f0e385f | 1847 | stats->OutputBytes += fsp->data_len; |
42e9a92f RL |
1848 | } else { |
1849 | fsp->req_flags = 0; | |
1850 | stats->ControlRequests++; | |
1851 | } | |
f018b73a | 1852 | put_cpu(); |
42e9a92f | 1853 | |
42e9a92f RL |
1854 | /* |
1855 | * send it to the lower layer | |
1856 | * if we get -1 return then put the request in the pending | |
1857 | * queue. | |
1858 | */ | |
3a3b42bf | 1859 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1860 | if (rval != 0) { |
1861 | fsp->state = FC_SRB_FREE; | |
1862 | fc_fcp_pkt_release(fsp); | |
1863 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1864 | } | |
1865 | out: | |
1866 | return rc; | |
1867 | } | |
1868 | EXPORT_SYMBOL(fc_queuecommand); | |
1869 | ||
1870 | /** | |
3a3b42bf RL |
1871 | * fc_io_compl() - Handle responses for completed commands |
1872 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1873 | * |
3a3b42bf | 1874 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1875 | * The fcp packet lock must be held when calling. |
1876 | */ | |
1877 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1878 | { | |
1879 | struct fc_fcp_internal *si; | |
1880 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1881 | struct fc_lport *lport; |
42e9a92f RL |
1882 | unsigned long flags; |
1883 | ||
b277d2aa YZ |
1884 | /* release outstanding ddp context */ |
1885 | fc_fcp_ddp_done(fsp); | |
1886 | ||
42e9a92f RL |
1887 | fsp->state |= FC_SRB_COMPL; |
1888 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1889 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1890 | del_timer_sync(&fsp->timer); | |
1891 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1892 | } | |
1893 | ||
3a3b42bf RL |
1894 | lport = fsp->lp; |
1895 | si = fc_get_scsi_internal(lport); | |
42e9a92f RL |
1896 | |
1897 | /* | |
84c3e1ad VD |
1898 | * if can_queue ramp down is done then try can_queue ramp up |
1899 | * since commands are completing now. | |
42e9a92f | 1900 | */ |
84c3e1ad VD |
1901 | if (si->last_can_queue_ramp_down_time) |
1902 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1903 | |
1904 | sc_cmd = fsp->cmd; | |
42e9a92f RL |
1905 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; |
1906 | switch (fsp->status_code) { | |
1907 | case FC_COMPLETE: | |
1908 | if (fsp->cdb_status == 0) { | |
1909 | /* | |
1910 | * good I/O status | |
1911 | */ | |
1912 | sc_cmd->result = DID_OK << 16; | |
1913 | if (fsp->scsi_resid) | |
1914 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1915 | } else { |
1916 | /* | |
1917 | * transport level I/O was ok but scsi | |
1918 | * has non zero status | |
1919 | */ | |
1920 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1921 | } | |
1922 | break; | |
1923 | case FC_ERROR: | |
b3ef990c RL |
1924 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1925 | "due to FC_ERROR\n"); | |
42e9a92f RL |
1926 | sc_cmd->result = DID_ERROR << 16; |
1927 | break; | |
1928 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1929 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1930 | /* |
1931 | * scsi status is good but transport level | |
26d9cab5 | 1932 | * underrun. |
42e9a92f | 1933 | */ |
b3ef990c RL |
1934 | if (fsp->state & FC_SRB_RCV_STATUS) { |
1935 | sc_cmd->result = DID_OK << 16; | |
1936 | } else { | |
1937 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
1938 | " due to FC_DATA_UNDRUN (trans)\n"); | |
1939 | sc_cmd->result = DID_ERROR << 16; | |
1940 | } | |
42e9a92f RL |
1941 | } else { |
1942 | /* | |
1943 | * scsi got underrun, this is an error | |
1944 | */ | |
b3ef990c RL |
1945 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1946 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
42e9a92f RL |
1947 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
1948 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1949 | } | |
1950 | break; | |
1951 | case FC_DATA_OVRRUN: | |
1952 | /* | |
1953 | * overrun is an error | |
1954 | */ | |
b3ef990c RL |
1955 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1956 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
1957 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
1958 | break; | |
1959 | case FC_CMD_ABORTED: | |
b3ef990c | 1960 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
ac17ea8d | 1961 | "due to FC_CMD_ABORTED\n"); |
d5e6054a | 1962 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f | 1963 | break; |
42e9a92f | 1964 | case FC_CMD_RESET: |
ac17ea8d | 1965 | FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " |
1966 | "due to FC_CMD_RESET\n"); | |
42e9a92f RL |
1967 | sc_cmd->result = (DID_RESET << 16); |
1968 | break; | |
1969 | case FC_HRD_ERROR: | |
ac17ea8d | 1970 | FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " |
1971 | "due to FC_HRD_ERROR\n"); | |
42e9a92f RL |
1972 | sc_cmd->result = (DID_NO_CONNECT << 16); |
1973 | break; | |
ac17ea8d | 1974 | case FC_CRC_ERROR: |
1975 | FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " | |
1976 | "due to FC_CRC_ERROR\n"); | |
1977 | sc_cmd->result = (DID_PARITY << 16); | |
1978 | break; | |
1979 | case FC_TIMED_OUT: | |
1980 | FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " | |
1981 | "due to FC_TIMED_OUT\n"); | |
1982 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
1983 | break; | |
42e9a92f | 1984 | default: |
b3ef990c RL |
1985 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1986 | "due to unknown error\n"); | |
42e9a92f RL |
1987 | sc_cmd->result = (DID_ERROR << 16); |
1988 | break; | |
1989 | } | |
1990 | ||
75eee725 VD |
1991 | if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) |
1992 | sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); | |
e0d93c5b | 1993 | |
c1ecb90a | 1994 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1995 | list_del(&fsp->list); |
1996 | sc_cmd->SCp.ptr = NULL; | |
8b7ac2bb | 1997 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f | 1998 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
1999 | |
2000 | /* release ref from initial allocation in queue command */ | |
2001 | fc_fcp_pkt_release(fsp); | |
2002 | } | |
2003 | ||
42e9a92f | 2004 | /** |
34f42a07 | 2005 | * fc_eh_abort() - Abort a command |
3a3b42bf | 2006 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 2007 | * |
3a3b42bf RL |
2008 | * From SCSI host template. |
2009 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
2010 | */ |
2011 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
2012 | { | |
2013 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 2014 | struct fc_lport *lport; |
8b7ac2bb | 2015 | struct fc_fcp_internal *si; |
42e9a92f RL |
2016 | int rc = FAILED; |
2017 | unsigned long flags; | |
21cc0bd3 VD |
2018 | int rval; |
2019 | ||
2020 | rval = fc_block_scsi_eh(sc_cmd); | |
2021 | if (rval) | |
2022 | return rval; | |
42e9a92f | 2023 | |
3a3b42bf RL |
2024 | lport = shost_priv(sc_cmd->device->host); |
2025 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2026 | return rc; |
3a3b42bf | 2027 | else if (!lport->link_up) |
42e9a92f RL |
2028 | return rc; |
2029 | ||
8b7ac2bb VD |
2030 | si = fc_get_scsi_internal(lport); |
2031 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f RL |
2032 | fsp = CMD_SP(sc_cmd); |
2033 | if (!fsp) { | |
2034 | /* command completed while scsi eh was setting up */ | |
3c2c3bf2 | 2035 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2036 | return SUCCESS; |
2037 | } | |
2038 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
2039 | fc_fcp_pkt_hold(fsp); | |
8b7ac2bb | 2040 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2041 | |
2042 | if (fc_fcp_lock_pkt(fsp)) { | |
2043 | /* completed while we were waiting for timer to be deleted */ | |
2044 | rc = SUCCESS; | |
2045 | goto release_pkt; | |
2046 | } | |
2047 | ||
c340111d | 2048 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2049 | fc_fcp_unlock_pkt(fsp); |
2050 | ||
2051 | release_pkt: | |
2052 | fc_fcp_pkt_release(fsp); | |
2053 | return rc; | |
2054 | } | |
2055 | EXPORT_SYMBOL(fc_eh_abort); | |
2056 | ||
2057 | /** | |
3a3b42bf RL |
2058 | * fc_eh_device_reset() - Reset a single LUN |
2059 | * @sc_cmd: The SCSI command which identifies the device whose | |
2060 | * LUN is to be reset | |
42e9a92f | 2061 | * |
3a3b42bf | 2062 | * Set from SCSI host template. |
42e9a92f RL |
2063 | */ |
2064 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2065 | { | |
3a3b42bf | 2066 | struct fc_lport *lport; |
42e9a92f RL |
2067 | struct fc_fcp_pkt *fsp; |
2068 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2069 | int rc = FAILED; | |
42e9a92f RL |
2070 | int rval; |
2071 | ||
21cc0bd3 | 2072 | rval = fc_block_scsi_eh(sc_cmd); |
42e9a92f | 2073 | if (rval) |
21cc0bd3 | 2074 | return rval; |
42e9a92f | 2075 | |
3a3b42bf | 2076 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2077 | |
3a3b42bf | 2078 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2079 | return rc; |
2080 | ||
ce8b5df0 | 2081 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2082 | |
3a3b42bf | 2083 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2084 | if (fsp == NULL) { |
7414705e | 2085 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2086 | goto out; |
2087 | } | |
2088 | ||
2089 | /* | |
2090 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2091 | * the sc passed in is not setup for execution like when sent | |
2092 | * through the queuecommand callout. | |
2093 | */ | |
42e9a92f RL |
2094 | fsp->rport = rport; /* set the remote port ptr */ |
2095 | ||
2096 | /* | |
2097 | * flush outstanding commands | |
2098 | */ | |
3a3b42bf | 2099 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2100 | fsp->state = FC_SRB_FREE; |
2101 | fc_fcp_pkt_release(fsp); | |
2102 | ||
2103 | out: | |
2104 | return rc; | |
2105 | } | |
2106 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2107 | ||
2108 | /** | |
3a3b42bf RL |
2109 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2110 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2111 | */ |
2112 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2113 | { | |
2114 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2115 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2116 | unsigned long wait_tmo; |
2117 | ||
3a3b42bf | 2118 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2119 | |
21cc0bd3 VD |
2120 | fc_block_scsi_eh(sc_cmd); |
2121 | ||
3a3b42bf | 2122 | lport->tt.lport_reset(lport); |
42e9a92f | 2123 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2124 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2125 | wait_tmo)) | |
42e9a92f RL |
2126 | msleep(1000); |
2127 | ||
3a3b42bf | 2128 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2129 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
7b2787ec | 2130 | "on port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2131 | return SUCCESS; |
2132 | } else { | |
7414705e | 2133 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2134 | "port (%6.6x) is not ready.\n", |
7b2787ec | 2135 | lport->port_id); |
42e9a92f RL |
2136 | return FAILED; |
2137 | } | |
2138 | } | |
2139 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2140 | ||
2141 | /** | |
3a3b42bf RL |
2142 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2143 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2144 | * |
2145 | * Configures queue depth based on host's cmd_per_len. If not set | |
2146 | * then we use the libfc default. | |
2147 | */ | |
2148 | int fc_slave_alloc(struct scsi_device *sdev) | |
2149 | { | |
2150 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2151 | |
2152 | if (!rport || fc_remote_port_chkready(rport)) | |
2153 | return -ENXIO; | |
2154 | ||
14caf44c VD |
2155 | if (sdev->tagged_supported) |
2156 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2157 | else | |
2158 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2159 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2160 | ||
42e9a92f RL |
2161 | return 0; |
2162 | } | |
2163 | EXPORT_SYMBOL(fc_slave_alloc); | |
2164 | ||
3a3b42bf RL |
2165 | /** |
2166 | * fc_change_queue_depth() - Change a device's queue depth | |
2167 | * @sdev: The SCSI device whose queue depth is to change | |
2168 | * @qdepth: The new queue depth | |
2169 | * @reason: The resason for the change | |
2170 | */ | |
e881a172 | 2171 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2172 | { |
5c20848a MC |
2173 | switch (reason) { |
2174 | case SCSI_QDEPTH_DEFAULT: | |
2175 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2176 | break; | |
2177 | case SCSI_QDEPTH_QFULL: | |
2178 | scsi_track_queue_full(sdev, qdepth); | |
2179 | break; | |
229b8d72 VD |
2180 | case SCSI_QDEPTH_RAMP_UP: |
2181 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2182 | break; | |
5c20848a | 2183 | default: |
e881a172 | 2184 | return -EOPNOTSUPP; |
5c20848a | 2185 | } |
42e9a92f RL |
2186 | return sdev->queue_depth; |
2187 | } | |
2188 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2189 | ||
3a3b42bf RL |
2190 | /** |
2191 | * fc_change_queue_type() - Change a device's queue type | |
2192 | * @sdev: The SCSI device whose queue depth is to change | |
2193 | * @tag_type: Identifier for queue type | |
2194 | */ | |
42e9a92f RL |
2195 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
2196 | { | |
2197 | if (sdev->tagged_supported) { | |
2198 | scsi_set_tag_type(sdev, tag_type); | |
2199 | if (tag_type) | |
2200 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2201 | else | |
2202 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2203 | } else | |
2204 | tag_type = 0; | |
2205 | ||
2206 | return tag_type; | |
2207 | } | |
2208 | EXPORT_SYMBOL(fc_change_queue_type); | |
2209 | ||
3a3b42bf RL |
2210 | /** |
2211 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2212 | * @lport: The local port that no longer needs the FCP layer | |
2213 | */ | |
2214 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2215 | { |
3a3b42bf | 2216 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2217 | |
2218 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2219 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
7b2787ec | 2220 | "port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2221 | |
2222 | mempool_destroy(si->scsi_pkt_pool); | |
2223 | kfree(si); | |
3a3b42bf | 2224 | lport->scsi_priv = NULL; |
42e9a92f RL |
2225 | } |
2226 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2227 | ||
55204909 | 2228 | int fc_setup_fcp(void) |
93e6d5ab RL |
2229 | { |
2230 | int rc = 0; | |
2231 | ||
2232 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2233 | sizeof(struct fc_fcp_pkt), | |
2234 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2235 | if (!scsi_pkt_cachep) { | |
2236 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2237 | "module load failed!"); | |
2238 | rc = -ENOMEM; | |
2239 | } | |
2240 | ||
2241 | return rc; | |
2242 | } | |
2243 | ||
55204909 | 2244 | void fc_destroy_fcp(void) |
93e6d5ab RL |
2245 | { |
2246 | if (scsi_pkt_cachep) | |
2247 | kmem_cache_destroy(scsi_pkt_cachep); | |
2248 | } | |
2249 | ||
3a3b42bf RL |
2250 | /** |
2251 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2252 | * @lport: The local port to initialize the exchange layer for | |
2253 | */ | |
2254 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2255 | { |
2256 | int rc; | |
2257 | struct fc_fcp_internal *si; | |
2258 | ||
3a3b42bf RL |
2259 | if (!lport->tt.fcp_cmd_send) |
2260 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2261 | |
3a3b42bf RL |
2262 | if (!lport->tt.fcp_cleanup) |
2263 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2264 | |
3a3b42bf RL |
2265 | if (!lport->tt.fcp_abort_io) |
2266 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2267 | |
2268 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2269 | if (!si) | |
2270 | return -ENOMEM; | |
3a3b42bf | 2271 | lport->scsi_priv = si; |
84c3e1ad | 2272 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2273 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2274 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2275 | |
2276 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2277 | if (!si->scsi_pkt_pool) { | |
2278 | rc = -ENOMEM; | |
2279 | goto free_internal; | |
2280 | } | |
2281 | return 0; | |
2282 | ||
2283 | free_internal: | |
2284 | kfree(si); | |
2285 | return rc; | |
2286 | } | |
2287 | EXPORT_SYMBOL(fc_fcp_init); |