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a61127c2 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
42e9a92f RL |
2 | /* |
3 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | |
4 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. | |
5 | * Copyright(c) 2008 Mike Christie | |
6 | * | |
42e9a92f RL |
7 | * Maintained at www.Open-FCoE.org |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/scatterlist.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/crc32.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
42e9a92f RL |
19 | |
20 | #include <scsi/scsi_tcq.h> | |
21 | #include <scsi/scsi.h> | |
22 | #include <scsi/scsi_host.h> | |
23 | #include <scsi/scsi_device.h> | |
24 | #include <scsi/scsi_cmnd.h> | |
25 | ||
26 | #include <scsi/fc/fc_fc2.h> | |
27 | ||
28 | #include <scsi/libfc.h> | |
42e9a92f | 29 | |
e31ac898 | 30 | #include "fc_encode.h" |
8866a5d9 | 31 | #include "fc_libfc.h" |
42e9a92f | 32 | |
55204909 | 33 | static struct kmem_cache *scsi_pkt_cachep; |
42e9a92f RL |
34 | |
35 | /* SRB state definitions */ | |
36 | #define FC_SRB_FREE 0 /* cmd is free */ | |
37 | #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ | |
38 | #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ | |
39 | #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ | |
3ad2f3fb | 40 | #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ |
42e9a92f RL |
41 | #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ |
42 | #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ | |
43 | #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ | |
42e9a92f RL |
44 | |
45 | #define FC_SRB_READ (1 << 1) | |
46 | #define FC_SRB_WRITE (1 << 0) | |
47 | ||
5d21aa36 BVA |
48 | static struct libfc_cmd_priv *libfc_priv(struct scsi_cmnd *cmd) |
49 | { | |
50 | return scsi_cmd_priv(cmd); | |
51 | } | |
42e9a92f | 52 | |
3a3b42bf RL |
53 | /** |
54 | * struct fc_fcp_internal - FCP layer internal data | |
c1ecb90a CL |
55 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
56 | * @scsi_queue_lock: Protects the scsi_pkt_queue | |
3a3b42bf | 57 | * @scsi_pkt_queue: Current FCP packets |
84c3e1ad VD |
58 | * @last_can_queue_ramp_down_time: ramp down time |
59 | * @last_can_queue_ramp_up_time: ramp up time | |
60 | * @max_can_queue: max can_queue size | |
3a3b42bf | 61 | */ |
42e9a92f | 62 | struct fc_fcp_internal { |
c1ecb90a CL |
63 | mempool_t *scsi_pkt_pool; |
64 | spinlock_t scsi_queue_lock; | |
65 | struct list_head scsi_pkt_queue; | |
66 | unsigned long last_can_queue_ramp_down_time; | |
67 | unsigned long last_can_queue_ramp_up_time; | |
68 | int max_can_queue; | |
42e9a92f RL |
69 | }; |
70 | ||
71 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
72 | ||
73 | /* | |
74 | * function prototypes | |
75 | * FC scsi I/O related functions | |
76 | */ | |
77 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
78 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
79 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
80 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
81 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 82 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
ac17ea8d | 83 | static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); |
1f0849da | 84 | static void fc_fcp_timeout(struct timer_list *); |
42e9a92f RL |
85 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
86 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
87 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
88 | static void fc_io_compl(struct fc_fcp_pkt *); | |
89 | ||
90 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
91 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
92 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
93 | ||
94 | /* | |
95 | * command status codes | |
96 | */ | |
97 | #define FC_COMPLETE 0 | |
98 | #define FC_CMD_ABORTED 1 | |
99 | #define FC_CMD_RESET 2 | |
100 | #define FC_CMD_PLOGO 3 | |
101 | #define FC_SNS_RCV 4 | |
102 | #define FC_TRANS_ERR 5 | |
103 | #define FC_DATA_OVRRUN 6 | |
104 | #define FC_DATA_UNDRUN 7 | |
105 | #define FC_ERROR 8 | |
106 | #define FC_HRD_ERROR 9 | |
ac17ea8d | 107 | #define FC_CRC_ERROR 10 |
108 | #define FC_TIMED_OUT 11 | |
a0452bb4 | 109 | #define FC_TRANS_RESET 12 |
42e9a92f RL |
110 | |
111 | /* | |
112 | * Error recovery timeout values. | |
113 | */ | |
42e9a92f | 114 | #define FC_SCSI_TM_TOV (10 * HZ) |
42e9a92f | 115 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
84c3e1ad | 116 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
42e9a92f RL |
117 | |
118 | #define FC_MAX_ERROR_CNT 5 | |
119 | #define FC_MAX_RECOV_RETRY 3 | |
120 | ||
121 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
122 | ||
123 | /** | |
3a3b42bf RL |
124 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
125 | * @lport: The local port that the FCP packet is for | |
126 | * @gfp: GFP flags for allocation | |
42e9a92f | 127 | * |
3a3b42bf RL |
128 | * Return value: fcp_pkt structure or null on allocation failure. |
129 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 130 | */ |
3a3b42bf | 131 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 132 | { |
3a3b42bf | 133 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
134 | struct fc_fcp_pkt *fsp; |
135 | ||
136 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
137 | if (fsp) { | |
138 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 139 | fsp->lp = lport; |
f56635a8 | 140 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
22c70d1a | 141 | refcount_set(&fsp->ref_cnt, 1); |
1f0849da | 142 | timer_setup(&fsp->timer, NULL, 0); |
42e9a92f RL |
143 | INIT_LIST_HEAD(&fsp->list); |
144 | spin_lock_init(&fsp->scsi_pkt_lock); | |
0f02a665 | 145 | } else { |
a912460e | 146 | this_cpu_inc(lport->stats->FcpPktAllocFails); |
42e9a92f RL |
147 | } |
148 | return fsp; | |
149 | } | |
150 | ||
151 | /** | |
3a3b42bf RL |
152 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
153 | * @fsp: The FCP packet to be released | |
42e9a92f | 154 | * |
3a3b42bf RL |
155 | * Context: Can be called from process or interrupt context, |
156 | * no lock is required. | |
42e9a92f RL |
157 | */ |
158 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
159 | { | |
22c70d1a | 160 | if (refcount_dec_and_test(&fsp->ref_cnt)) { |
42e9a92f RL |
161 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); |
162 | ||
163 | mempool_free(fsp, si->scsi_pkt_pool); | |
164 | } | |
165 | } | |
166 | ||
3a3b42bf RL |
167 | /** |
168 | * fc_fcp_pkt_hold() - Hold a fcp_pkt | |
169 | * @fsp: The FCP packet to be held | |
170 | */ | |
42e9a92f RL |
171 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
172 | { | |
22c70d1a | 173 | refcount_inc(&fsp->ref_cnt); |
42e9a92f RL |
174 | } |
175 | ||
176 | /** | |
ce83a4ca | 177 | * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt |
3a3b42bf RL |
178 | * @seq: The sequence that the FCP packet is on (required by destructor API) |
179 | * @fsp: The FCP packet to be released | |
180 | * | |
3afd2d15 | 181 | * This routine is called by a destructor callback in the fc_exch_seq_send() |
3a3b42bf RL |
182 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required |
183 | * argument even though it is not used by this routine. | |
42e9a92f | 184 | * |
3a3b42bf | 185 | * Context: No locking required. |
42e9a92f RL |
186 | */ |
187 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
188 | { | |
189 | fc_fcp_pkt_release(fsp); | |
190 | } | |
191 | ||
192 | /** | |
3a3b42bf RL |
193 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
194 | * @fsp: The FCP packet to be locked and incremented | |
42e9a92f | 195 | * |
3a3b42bf | 196 | * We should only return error if we return a command to SCSI-ml before |
42e9a92f RL |
197 | * getting a response. This can happen in cases where we send a abort, but |
198 | * do not wait for the response and the abort and command can be passing | |
199 | * each other on the wire/network-layer. | |
200 | * | |
201 | * Note: this function locks the packet and gets a reference to allow | |
202 | * callers to call the completion function while the lock is held and | |
203 | * not have to worry about the packets refcount. | |
204 | * | |
205 | * TODO: Maybe we should just have callers grab/release the lock and | |
206 | * have a function that they call to verify the fsp and grab a ref if | |
207 | * needed. | |
208 | */ | |
209 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
210 | { | |
211 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
212 | if (fsp->state & FC_SRB_COMPL) { | |
213 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
214 | return -EPERM; | |
215 | } | |
216 | ||
217 | fc_fcp_pkt_hold(fsp); | |
218 | return 0; | |
219 | } | |
220 | ||
3a3b42bf RL |
221 | /** |
222 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its | |
223 | * reference count | |
224 | * @fsp: The FCP packet to be unlocked and decremented | |
225 | */ | |
42e9a92f RL |
226 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
227 | { | |
228 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
229 | fc_fcp_pkt_release(fsp); | |
230 | } | |
231 | ||
3a3b42bf RL |
232 | /** |
233 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt | |
234 | * @fsp: The FCP packet to start a timer for | |
f2817ec2 | 235 | * @delay: The timeout period in jiffies |
3a3b42bf | 236 | */ |
42e9a92f RL |
237 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
238 | { | |
ad3120cf | 239 | if (!(fsp->state & FC_SRB_COMPL)) { |
42e9a92f | 240 | mod_timer(&fsp->timer, jiffies + delay); |
ad3120cf HR |
241 | fsp->timer_delay = delay; |
242 | } | |
42e9a92f RL |
243 | } |
244 | ||
d11b44ef HR |
245 | static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp) |
246 | { | |
247 | fsp->state |= FC_SRB_ABORTED; | |
248 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
249 | ||
250 | if (fsp->wait_for_comp) | |
251 | complete(&fsp->tm_done); | |
252 | else | |
253 | fc_fcp_complete_locked(fsp); | |
254 | } | |
255 | ||
3a3b42bf RL |
256 | /** |
257 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a | |
258 | * fcp_pkt | |
259 | * @fsp: The FCP packet to abort exchanges on | |
260 | */ | |
42e9a92f RL |
261 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
262 | { | |
d11b44ef HR |
263 | int rc; |
264 | ||
42e9a92f RL |
265 | if (!fsp->seq_ptr) |
266 | return -EINVAL; | |
267 | ||
b57c4db5 HR |
268 | if (fsp->state & FC_SRB_ABORT_PENDING) { |
269 | FC_FCP_DBG(fsp, "abort already pending\n"); | |
270 | return -EBUSY; | |
271 | } | |
272 | ||
a912460e | 273 | this_cpu_inc(fsp->lp->stats->FcpPktAborts); |
0f02a665 | 274 | |
42e9a92f | 275 | fsp->state |= FC_SRB_ABORT_PENDING; |
0ebaed17 | 276 | rc = fc_seq_exch_abort(fsp->seq_ptr, 0); |
d11b44ef | 277 | /* |
0ebaed17 | 278 | * fc_seq_exch_abort() might return -ENXIO if |
d11b44ef HR |
279 | * the sequence is already completed |
280 | */ | |
281 | if (rc == -ENXIO) { | |
282 | fc_fcp_abort_done(fsp); | |
283 | rc = 0; | |
284 | } | |
285 | return rc; | |
42e9a92f RL |
286 | } |
287 | ||
3a3b42bf RL |
288 | /** |
289 | * fc_fcp_retry_cmd() - Retry a fcp_pkt | |
290 | * @fsp: The FCP packet to be retried | |
ebb40ab6 | 291 | * @status_code: The FCP status code to set |
3a3b42bf RL |
292 | * |
293 | * Sets the status code to be FC_ERROR and then calls | |
294 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). | |
295 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. | |
296 | * The SCSI-ml will retry the command. | |
42e9a92f | 297 | */ |
a0452bb4 | 298 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code) |
42e9a92f RL |
299 | { |
300 | if (fsp->seq_ptr) { | |
768c72cc | 301 | fc_exch_done(fsp->seq_ptr); |
42e9a92f RL |
302 | fsp->seq_ptr = NULL; |
303 | } | |
304 | ||
305 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 306 | fsp->io_status = 0; |
a0452bb4 | 307 | fsp->status_code = status_code; |
42e9a92f RL |
308 | fc_fcp_complete_locked(fsp); |
309 | } | |
310 | ||
3a3b42bf RL |
311 | /** |
312 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context | |
313 | * @fsp: The FCP packet that will manage the DDP frames | |
314 | * @xid: The XID that will be used for the DDP exchange | |
b277d2aa YZ |
315 | */ |
316 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
317 | { | |
3a3b42bf | 318 | struct fc_lport *lport; |
b277d2aa | 319 | |
3a3b42bf | 320 | lport = fsp->lp; |
b277d2aa | 321 | if ((fsp->req_flags & FC_SRB_READ) && |
3a3b42bf RL |
322 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
323 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), | |
324 | scsi_sg_count(fsp->cmd))) | |
b277d2aa YZ |
325 | fsp->xfer_ddp = xid; |
326 | } | |
327 | } | |
b277d2aa | 328 | |
3a3b42bf RL |
329 | /** |
330 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any | |
331 | * DDP related resources for a fcp_pkt | |
332 | * @fsp: The FCP packet that DDP had been used on | |
b277d2aa | 333 | */ |
6a716a85 | 334 | void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) |
b277d2aa | 335 | { |
3a3b42bf | 336 | struct fc_lport *lport; |
b277d2aa YZ |
337 | |
338 | if (!fsp) | |
339 | return; | |
340 | ||
5e472d07 YZ |
341 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
342 | return; | |
343 | ||
3a3b42bf RL |
344 | lport = fsp->lp; |
345 | if (lport->tt.ddp_done) { | |
346 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); | |
5e472d07 | 347 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
348 | } |
349 | } | |
350 | ||
84c3e1ad VD |
351 | /** |
352 | * fc_fcp_can_queue_ramp_up() - increases can_queue | |
353 | * @lport: lport to ramp up can_queue | |
84c3e1ad VD |
354 | */ |
355 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) | |
356 | { | |
357 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
9c8cce8e | 358 | unsigned long flags; |
84c3e1ad VD |
359 | int can_queue; |
360 | ||
9c8cce8e RL |
361 | spin_lock_irqsave(lport->host->host_lock, flags); |
362 | ||
84c3e1ad VD |
363 | if (si->last_can_queue_ramp_up_time && |
364 | (time_before(jiffies, si->last_can_queue_ramp_up_time + | |
365 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 366 | goto unlock; |
84c3e1ad VD |
367 | |
368 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
369 | FC_CAN_QUEUE_PERIOD)) | |
9c8cce8e | 370 | goto unlock; |
84c3e1ad VD |
371 | |
372 | si->last_can_queue_ramp_up_time = jiffies; | |
373 | ||
374 | can_queue = lport->host->can_queue << 1; | |
375 | if (can_queue >= si->max_can_queue) { | |
376 | can_queue = si->max_can_queue; | |
377 | si->last_can_queue_ramp_down_time = 0; | |
378 | } | |
379 | lport->host->can_queue = can_queue; | |
380 | shost_printk(KERN_ERR, lport->host, "libfc: increased " | |
381 | "can_queue to %d.\n", can_queue); | |
9c8cce8e RL |
382 | |
383 | unlock: | |
384 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
84c3e1ad VD |
385 | } |
386 | ||
c46be11a VD |
387 | /** |
388 | * fc_fcp_can_queue_ramp_down() - reduces can_queue | |
389 | * @lport: lport to reduce can_queue | |
390 | * | |
391 | * If we are getting memory allocation failures, then we may | |
392 | * be trying to execute too many commands. We let the running | |
393 | * commands complete or timeout, then try again with a reduced | |
394 | * can_queue. Eventually we will hit the point where we run | |
395 | * on all reserved structs. | |
396 | */ | |
c1061255 | 397 | static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport) |
c46be11a VD |
398 | { |
399 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
9c8cce8e | 400 | unsigned long flags; |
c46be11a | 401 | int can_queue; |
c1061255 | 402 | bool changed = false; |
c46be11a | 403 | |
9c8cce8e RL |
404 | spin_lock_irqsave(lport->host->host_lock, flags); |
405 | ||
84c3e1ad VD |
406 | if (si->last_can_queue_ramp_down_time && |
407 | (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
408 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 409 | goto unlock; |
84c3e1ad VD |
410 | |
411 | si->last_can_queue_ramp_down_time = jiffies; | |
c46be11a VD |
412 | |
413 | can_queue = lport->host->can_queue; | |
414 | can_queue >>= 1; | |
415 | if (!can_queue) | |
416 | can_queue = 1; | |
417 | lport->host->can_queue = can_queue; | |
c1061255 | 418 | changed = true; |
9c8cce8e RL |
419 | |
420 | unlock: | |
421 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
c1061255 | 422 | return changed; |
c46be11a VD |
423 | } |
424 | ||
425 | /* | |
426 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. | |
427 | * @lport: fc lport struct | |
428 | * @len: payload length | |
429 | * | |
430 | * Allocates fc_frame structure and buffer but if fails to allocate | |
431 | * then reduce can_queue. | |
432 | */ | |
433 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, | |
434 | size_t len) | |
435 | { | |
436 | struct fc_frame *fp; | |
437 | ||
438 | fp = fc_frame_alloc(lport, len); | |
c1ecb90a CL |
439 | if (likely(fp)) |
440 | return fp; | |
441 | ||
a912460e | 442 | this_cpu_inc(lport->stats->FcpFrameAllocFails); |
c1ecb90a | 443 | /* error case */ |
c1ecb90a | 444 | fc_fcp_can_queue_ramp_down(lport); |
5d339d16 HR |
445 | shost_printk(KERN_ERR, lport->host, |
446 | "libfc: Could not allocate frame, " | |
447 | "reducing can_queue to %d.\n", lport->host->can_queue); | |
c1ecb90a | 448 | return NULL; |
c46be11a VD |
449 | } |
450 | ||
87da3b83 HR |
451 | /** |
452 | * get_fsp_rec_tov() - Helper function to get REC_TOV | |
453 | * @fsp: the FCP packet | |
454 | * | |
455 | * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second | |
456 | */ | |
457 | static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) | |
458 | { | |
459 | struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; | |
460 | unsigned int e_d_tov = FC_DEF_E_D_TOV; | |
461 | ||
462 | if (rpriv && rpriv->e_d_tov > e_d_tov) | |
463 | e_d_tov = rpriv->e_d_tov; | |
464 | return msecs_to_jiffies(e_d_tov) + HZ; | |
465 | } | |
466 | ||
3a3b42bf RL |
467 | /** |
468 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
469 | * @fsp: The FCP packet the data is on | |
470 | * @fp: The data frame | |
42e9a92f RL |
471 | */ |
472 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
473 | { | |
474 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 475 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
476 | struct fc_frame_header *fh; |
477 | size_t start_offset; | |
478 | size_t offset; | |
479 | u32 crc; | |
480 | u32 copy_len = 0; | |
481 | size_t len; | |
482 | void *buf; | |
483 | struct scatterlist *sg; | |
58682874 | 484 | u32 nents; |
ac17ea8d | 485 | u8 host_bcode = FC_COMPLETE; |
42e9a92f RL |
486 | |
487 | fh = fc_frame_header_get(fp); | |
488 | offset = ntohl(fh->fh_parm_offset); | |
489 | start_offset = offset; | |
490 | len = fr_len(fp) - sizeof(*fh); | |
491 | buf = fc_frame_payload_get(fp, 0); | |
492 | ||
5c12c418 | 493 | /* |
ac17ea8d | 494 | * if this I/O is ddped then clear it and initiate recovery since data |
495 | * frames are expected to be placed directly in that case. | |
496 | * | |
497 | * Indicate error to scsi-ml because something went wrong with the | |
498 | * ddp handling to get us here. | |
5c12c418 VD |
499 | */ |
500 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { | |
501 | fc_fcp_ddp_done(fsp); | |
ac17ea8d | 502 | FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); |
503 | host_bcode = FC_ERROR; | |
5c12c418 VD |
504 | goto err; |
505 | } | |
42e9a92f | 506 | if (offset + len > fsp->data_len) { |
34f42a07 | 507 | /* this should never happen */ |
42e9a92f RL |
508 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
509 | fc_frame_crc_check(fp)) | |
510 | goto crc_err; | |
7414705e RL |
511 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
512 | "data_len %x\n", len, offset, fsp->data_len); | |
ac17ea8d | 513 | |
514 | /* Data is corrupted indicate scsi-ml should retry */ | |
515 | host_bcode = FC_DATA_OVRRUN; | |
5c12c418 | 516 | goto err; |
42e9a92f RL |
517 | } |
518 | if (offset != fsp->xfer_len) | |
519 | fsp->state |= FC_SRB_DISCONTIG; | |
520 | ||
42e9a92f | 521 | sg = scsi_sglist(sc); |
58682874 | 522 | nents = scsi_sg_count(sc); |
42e9a92f | 523 | |
58682874 RL |
524 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
525 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 526 | &offset, NULL); |
58682874 RL |
527 | } else { |
528 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
529 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 530 | &offset, &crc); |
42e9a92f | 531 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 532 | if (len % 4) |
42e9a92f | 533 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
534 | |
535 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
536 | crc_err: | |
a912460e | 537 | this_cpu_inc(lport->stats->ErrorFrames); |
f018b73a | 538 | /* per cpu count, not total count, but OK for limit */ |
a912460e | 539 | if (this_cpu_inc_return(lport->stats->InvalidCRCCount) < FC_MAX_ERROR_CNT) |
7414705e | 540 | printk(KERN_WARNING "libfc: CRC error on data " |
ce8b5df0 | 541 | "frame for port (%6.6x)\n", |
7b2787ec | 542 | lport->port_id); |
42e9a92f RL |
543 | /* |
544 | * Assume the frame is total garbage. | |
545 | * We may have copied it over the good part | |
546 | * of the buffer. | |
547 | * If so, we need to retry the entire operation. | |
548 | * Otherwise, ignore it. | |
549 | */ | |
ac17ea8d | 550 | if (fsp->state & FC_SRB_DISCONTIG) { |
551 | host_bcode = FC_CRC_ERROR; | |
5c12c418 | 552 | goto err; |
ac17ea8d | 553 | } |
42e9a92f RL |
554 | return; |
555 | } | |
556 | } | |
557 | ||
558 | if (fsp->xfer_contig_end == start_offset) | |
559 | fsp->xfer_contig_end += copy_len; | |
560 | fsp->xfer_len += copy_len; | |
561 | ||
562 | /* | |
563 | * In the very rare event that this data arrived after the response | |
564 | * and completes the transfer, call the completion handler. | |
565 | */ | |
566 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
87da3b83 HR |
567 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) { |
568 | FC_FCP_DBG( fsp, "complete out-of-order sequence\n" ); | |
42e9a92f | 569 | fc_fcp_complete_locked(fsp); |
87da3b83 | 570 | } |
5c12c418 VD |
571 | return; |
572 | err: | |
ac17ea8d | 573 | fc_fcp_recovery(fsp, host_bcode); |
42e9a92f RL |
574 | } |
575 | ||
34f42a07 | 576 | /** |
3a3b42bf RL |
577 | * fc_fcp_send_data() - Send SCSI data to a target |
578 | * @fsp: The FCP packet the data is on | |
ebb40ab6 | 579 | * @seq: The sequence the data is to be sent on |
3a3b42bf RL |
580 | * @offset: The starting offset for this data request |
581 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
582 | * |
583 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf | 584 | * If the LLD is capable of sequence offload then send down the |
9ddc5b6f | 585 | * seq_blen amount of data in single frame, otherwise send |
3a3b42bf RL |
586 | * multiple frames of the maximum frame payload supported by |
587 | * the target port. | |
42e9a92f RL |
588 | */ |
589 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
590 | size_t offset, size_t seq_blen) | |
591 | { | |
592 | struct fc_exch *ep; | |
593 | struct scsi_cmnd *sc; | |
594 | struct scatterlist *sg; | |
595 | struct fc_frame *fp = NULL; | |
3a3b42bf | 596 | struct fc_lport *lport = fsp->lp; |
18fa11ef | 597 | struct page *page; |
42e9a92f RL |
598 | size_t remaining; |
599 | size_t t_blen; | |
600 | size_t tlen; | |
601 | size_t sg_bytes; | |
602 | size_t frame_offset, fh_parm_offset; | |
18fa11ef | 603 | size_t off; |
42e9a92f RL |
604 | int error; |
605 | void *data = NULL; | |
606 | void *page_addr; | |
3a3b42bf | 607 | int using_sg = lport->sg_supp; |
42e9a92f RL |
608 | u32 f_ctl; |
609 | ||
610 | WARN_ON(seq_blen <= 0); | |
611 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
612 | /* this should never happen */ | |
7414705e RL |
613 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
614 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
615 | fc_fcp_send_abort(fsp); |
616 | return 0; | |
617 | } else if (offset != fsp->xfer_len) { | |
618 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
619 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
620 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
621 | } |
622 | ||
623 | /* | |
624 | * if LLD is capable of seq_offload then set transport | |
625 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
626 | * to max FC frame payload previously set in fsp->max_payload. | |
627 | */ | |
276d6814 | 628 | t_blen = fsp->max_payload; |
3a3b42bf RL |
629 | if (lport->seq_offload) { |
630 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 631 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 632 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
633 | } |
634 | ||
42e9a92f RL |
635 | if (t_blen > 512) |
636 | t_blen &= ~(512 - 1); /* round down to block size */ | |
42e9a92f RL |
637 | sc = fsp->cmd; |
638 | ||
639 | remaining = seq_blen; | |
640 | fh_parm_offset = frame_offset = offset; | |
641 | tlen = 0; | |
c6865b30 | 642 | seq = fc_seq_start_next(seq); |
42e9a92f RL |
643 | f_ctl = FC_FC_REL_OFF; |
644 | WARN_ON(!seq); | |
645 | ||
42e9a92f RL |
646 | sg = scsi_sglist(sc); |
647 | ||
648 | while (remaining > 0 && sg) { | |
649 | if (offset >= sg->length) { | |
650 | offset -= sg->length; | |
651 | sg = sg_next(sg); | |
652 | continue; | |
653 | } | |
654 | if (!fp) { | |
655 | tlen = min(t_blen, remaining); | |
656 | ||
657 | /* | |
658 | * TODO. Temporary workaround. fc_seq_send() can't | |
659 | * handle odd lengths in non-linear skbs. | |
660 | * This will be the final fragment only. | |
661 | */ | |
662 | if (tlen % 4) | |
663 | using_sg = 0; | |
a7bbc7f4 VD |
664 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
665 | if (!fp) | |
666 | return -ENOMEM; | |
667 | ||
668 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
669 | fh_parm_offset = frame_offset; |
670 | fr_max_payload(fp) = fsp->max_payload; | |
671 | } | |
18fa11ef CL |
672 | |
673 | off = offset + sg->offset; | |
42e9a92f | 674 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
675 | sg_bytes = min(sg_bytes, |
676 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
677 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 678 | if (using_sg) { |
18fa11ef | 679 | get_page(page); |
42e9a92f RL |
680 | skb_fill_page_desc(fp_skb(fp), |
681 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 682 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
683 | fp_skb(fp)->data_len += sg_bytes; |
684 | fr_len(fp) += sg_bytes; | |
685 | fp_skb(fp)->truesize += PAGE_SIZE; | |
686 | } else { | |
42e9a92f RL |
687 | /* |
688 | * The scatterlist item may be bigger than PAGE_SIZE, | |
689 | * but we must not cross pages inside the kmap. | |
690 | */ | |
77dfce07 | 691 | page_addr = kmap_atomic(page); |
42e9a92f RL |
692 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
693 | sg_bytes); | |
77dfce07 | 694 | kunmap_atomic(page_addr); |
42e9a92f RL |
695 | data += sg_bytes; |
696 | } | |
697 | offset += sg_bytes; | |
698 | frame_offset += sg_bytes; | |
699 | tlen -= sg_bytes; | |
700 | remaining -= sg_bytes; | |
701 | ||
d37322a4 YZ |
702 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
703 | (tlen)) | |
42e9a92f RL |
704 | continue; |
705 | ||
706 | /* | |
707 | * Send sequence with transfer sequence initiative in case | |
708 | * this is last FCP frame of the sequence. | |
709 | */ | |
710 | if (remaining == 0) | |
711 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
712 | ||
713 | ep = fc_seq_exch(seq); | |
714 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
715 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
716 | ||
717 | /* | |
718 | * send fragment using for a sequence. | |
719 | */ | |
0cac937d | 720 | error = fc_seq_send(lport, seq, fp); |
42e9a92f RL |
721 | if (error) { |
722 | WARN_ON(1); /* send error should be rare */ | |
8467b96c | 723 | return error; |
42e9a92f RL |
724 | } |
725 | fp = NULL; | |
726 | } | |
727 | fsp->xfer_len += seq_blen; /* premature count? */ | |
728 | return 0; | |
729 | } | |
730 | ||
3a3b42bf | 731 | /** |
547fb12b | 732 | * fc_fcp_abts_resp() - Receive an ABTS response |
3a3b42bf RL |
733 | * @fsp: The FCP packet that is being aborted |
734 | * @fp: The response frame | |
735 | */ | |
42e9a92f RL |
736 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
737 | { | |
738 | int ba_done = 1; | |
739 | struct fc_ba_rjt *brp; | |
740 | struct fc_frame_header *fh; | |
741 | ||
742 | fh = fc_frame_header_get(fp); | |
743 | switch (fh->fh_r_ctl) { | |
744 | case FC_RCTL_BA_ACC: | |
745 | break; | |
746 | case FC_RCTL_BA_RJT: | |
747 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
748 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
749 | break; | |
df561f66 | 750 | fallthrough; |
42e9a92f RL |
751 | default: |
752 | /* | |
753 | * we will let the command timeout | |
754 | * and scsi-ml recover in this case, | |
755 | * therefore cleared the ba_done flag. | |
756 | */ | |
757 | ba_done = 0; | |
758 | } | |
759 | ||
d11b44ef HR |
760 | if (ba_done) |
761 | fc_fcp_abort_done(fsp); | |
42e9a92f RL |
762 | } |
763 | ||
34f42a07 | 764 | /** |
547fb12b | 765 | * fc_fcp_recv() - Receive an FCP frame |
34f42a07 | 766 | * @seq: The sequence the frame is on |
3a3b42bf | 767 | * @fp: The received frame |
34f42a07 | 768 | * @arg: The related FCP packet |
42e9a92f | 769 | * |
3a3b42bf RL |
770 | * Context: Called from Soft IRQ context. Can not be called |
771 | * holding the FCP packet list lock. | |
42e9a92f RL |
772 | */ |
773 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
774 | { | |
775 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 776 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
777 | struct fc_frame_header *fh; |
778 | struct fcp_txrdy *dd; | |
779 | u8 r_ctl; | |
780 | int rc = 0; | |
781 | ||
c46be11a VD |
782 | if (IS_ERR(fp)) { |
783 | fc_fcp_error(fsp, fp); | |
784 | return; | |
785 | } | |
42e9a92f RL |
786 | |
787 | fh = fc_frame_header_get(fp); | |
788 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 789 | |
57d3ec7e HR |
790 | if (lport->state != LPORT_ST_READY) { |
791 | FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n", | |
792 | lport->state, r_ctl); | |
42e9a92f | 793 | goto out; |
57d3ec7e | 794 | } |
42e9a92f RL |
795 | if (fc_fcp_lock_pkt(fsp)) |
796 | goto out; | |
42e9a92f RL |
797 | |
798 | if (fh->fh_type == FC_TYPE_BLS) { | |
799 | fc_fcp_abts_resp(fsp, fp); | |
800 | goto unlock; | |
801 | } | |
802 | ||
57d3ec7e HR |
803 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) { |
804 | FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl); | |
42e9a92f | 805 | goto unlock; |
57d3ec7e | 806 | } |
42e9a92f RL |
807 | |
808 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
809 | /* | |
810 | * received XFER RDY from the target | |
811 | * need to send data to the target | |
812 | */ | |
813 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
814 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
815 | WARN_ON(!dd); | |
816 | ||
817 | rc = fc_fcp_send_data(fsp, seq, | |
818 | (size_t) ntohl(dd->ft_data_ro), | |
819 | (size_t) ntohl(dd->ft_burst_len)); | |
820 | if (!rc) | |
821 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
822 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
823 | /* | |
824 | * received a DATA frame | |
825 | * next we will copy the data to the system buffer | |
826 | */ | |
827 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
828 | fc_fcp_recv_data(fsp, fp); | |
829 | seq->rec_data = fsp->xfer_contig_end; | |
830 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
831 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
832 | ||
833 | fc_fcp_resp(fsp, fp); | |
834 | } else { | |
7414705e | 835 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
836 | } |
837 | unlock: | |
838 | fc_fcp_unlock_pkt(fsp); | |
839 | out: | |
840 | fc_frame_free(fp); | |
42e9a92f RL |
841 | } |
842 | ||
3a3b42bf RL |
843 | /** |
844 | * fc_fcp_resp() - Handler for FCP responses | |
845 | * @fsp: The FCP packet the response is for | |
846 | * @fp: The response frame | |
847 | */ | |
42e9a92f RL |
848 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
849 | { | |
850 | struct fc_frame_header *fh; | |
851 | struct fcp_resp *fc_rp; | |
852 | struct fcp_resp_ext *rp_ex; | |
853 | struct fcp_resp_rsp_info *fc_rp_info; | |
854 | u32 plen; | |
855 | u32 expected_len; | |
856 | u32 respl = 0; | |
857 | u32 snsl = 0; | |
858 | u8 flags = 0; | |
859 | ||
860 | plen = fr_len(fp); | |
861 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
862 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
863 | goto len_err; | |
864 | plen -= sizeof(*fh); | |
865 | fc_rp = (struct fcp_resp *)(fh + 1); | |
866 | fsp->cdb_status = fc_rp->fr_status; | |
867 | flags = fc_rp->fr_flags; | |
868 | fsp->scsi_comp_flags = flags; | |
869 | expected_len = fsp->data_len; | |
870 | ||
b277d2aa YZ |
871 | /* if ddp, update xfer len */ |
872 | fc_fcp_ddp_done(fsp); | |
873 | ||
42e9a92f RL |
874 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
875 | rp_ex = (void *)(fc_rp + 1); | |
876 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
877 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
878 | goto len_err; | |
879 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
880 | if (flags & FCP_RSP_LEN_VAL) { | |
881 | respl = ntohl(rp_ex->fr_rsp_len); | |
3b64b188 YZ |
882 | if ((respl != FCP_RESP_RSP_INFO_LEN4) && |
883 | (respl != FCP_RESP_RSP_INFO_LEN8)) | |
42e9a92f RL |
884 | goto len_err; |
885 | if (fsp->wait_for_comp) { | |
886 | /* Abuse cdb_status for rsp code */ | |
887 | fsp->cdb_status = fc_rp_info->rsp_code; | |
888 | complete(&fsp->tm_done); | |
889 | /* | |
890 | * tmfs will not have any scsi cmd so | |
891 | * exit here | |
892 | */ | |
893 | return; | |
63ac4bbf | 894 | } |
42e9a92f RL |
895 | } |
896 | if (flags & FCP_SNS_LEN_VAL) { | |
897 | snsl = ntohl(rp_ex->fr_sns_len); | |
898 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
899 | snsl = SCSI_SENSE_BUFFERSIZE; | |
900 | memcpy(fsp->cmd->sense_buffer, | |
901 | (char *)fc_rp_info + respl, snsl); | |
902 | } | |
903 | } | |
904 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
905 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
906 | goto len_err; | |
907 | if (flags & FCP_RESID_UNDER) { | |
908 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
909 | /* | |
910 | * The cmnd->underflow is the minimum number of | |
25985edc | 911 | * bytes that must be transferred for this |
42e9a92f RL |
912 | * command. Provided a sense condition is not |
913 | * present, make sure the actual amount | |
914 | * transferred is at least the underflow value | |
915 | * or fail. | |
916 | */ | |
917 | if (!(flags & FCP_SNS_LEN_VAL) && | |
918 | (fc_rp->fr_status == 0) && | |
919 | (scsi_bufflen(fsp->cmd) - | |
920 | fsp->scsi_resid) < fsp->cmd->underflow) | |
921 | goto err; | |
922 | expected_len -= fsp->scsi_resid; | |
923 | } else { | |
924 | fsp->status_code = FC_ERROR; | |
925 | } | |
926 | } | |
927 | } | |
928 | fsp->state |= FC_SRB_RCV_STATUS; | |
929 | ||
930 | /* | |
931 | * Check for missing or extra data frames. | |
932 | */ | |
9de99010 BVA |
933 | if (unlikely(fsp->cdb_status == SAM_STAT_GOOD && |
934 | fsp->xfer_len != expected_len)) { | |
42e9a92f RL |
935 | if (fsp->xfer_len < expected_len) { |
936 | /* | |
937 | * Some data may be queued locally, | |
938 | * Wait a at least one jiffy to see if it is delivered. | |
939 | * If this expires without data, we may do SRR. | |
940 | */ | |
ad3120cf HR |
941 | if (fsp->lp->qfull) { |
942 | FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n", | |
943 | fsp->rport->port_id); | |
944 | return; | |
945 | } | |
57d3ec7e HR |
946 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun " |
947 | "len %x, data len %x\n", | |
948 | fsp->rport->port_id, | |
949 | fsp->xfer_len, expected_len, fsp->data_len); | |
87da3b83 | 950 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
951 | return; |
952 | } | |
953 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 954 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
955 | "len %x, data len %x\n", |
956 | fsp->rport->port_id, | |
957 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
958 | } |
959 | fc_fcp_complete_locked(fsp); | |
960 | return; | |
961 | ||
962 | len_err: | |
7414705e RL |
963 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
964 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
965 | err: |
966 | fsp->status_code = FC_ERROR; | |
967 | fc_fcp_complete_locked(fsp); | |
968 | } | |
969 | ||
970 | /** | |
3a3b42bf RL |
971 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
972 | * fcp_pkt lock held | |
973 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
974 | * |
975 | * This function may sleep if a timer is pending. The packet lock must be | |
976 | * held, and the host lock must not be held. | |
977 | */ | |
978 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
979 | { | |
3a3b42bf | 980 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
981 | struct fc_seq *seq; |
982 | struct fc_exch *ep; | |
983 | u32 f_ctl; | |
984 | ||
985 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
986 | return; | |
987 | ||
988 | if (fsp->state & FC_SRB_ABORTED) { | |
989 | if (!fsp->status_code) | |
990 | fsp->status_code = FC_CMD_ABORTED; | |
991 | } else { | |
992 | /* | |
993 | * Test for transport underrun, independent of response | |
994 | * underrun status. | |
995 | */ | |
9de99010 BVA |
996 | if (fsp->cdb_status == SAM_STAT_GOOD && |
997 | fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
42e9a92f | 998 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || |
57d3ec7e HR |
999 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { |
1000 | FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n", | |
1001 | fsp->xfer_len, fsp->data_len); | |
42e9a92f | 1002 | fsp->status_code = FC_DATA_UNDRUN; |
57d3ec7e | 1003 | } |
42e9a92f RL |
1004 | } |
1005 | ||
1006 | seq = fsp->seq_ptr; | |
1007 | if (seq) { | |
1008 | fsp->seq_ptr = NULL; | |
1009 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
1010 | struct fc_frame *conf_frame; | |
1011 | struct fc_seq *csp; | |
1012 | ||
c6865b30 | 1013 | csp = fc_seq_start_next(seq); |
c46be11a | 1014 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
1015 | if (conf_frame) { |
1016 | f_ctl = FC_FC_SEQ_INIT; | |
1017 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1018 | ep = fc_seq_exch(seq); | |
1019 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
1020 | ep->did, ep->sid, | |
1021 | FC_TYPE_FCP, f_ctl, 0); | |
0cac937d | 1022 | fc_seq_send(lport, csp, conf_frame); |
42e9a92f RL |
1023 | } |
1024 | } | |
768c72cc | 1025 | fc_exch_done(seq); |
42e9a92f | 1026 | } |
d889b30a YZ |
1027 | /* |
1028 | * Some resets driven by SCSI are not I/Os and do not have | |
1029 | * SCSI commands associated with the requests. We should not | |
1030 | * call I/O completion if we do not have a SCSI command. | |
1031 | */ | |
1032 | if (fsp->cmd) | |
1033 | fc_io_compl(fsp); | |
42e9a92f RL |
1034 | } |
1035 | ||
3a3b42bf RL |
1036 | /** |
1037 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
1038 | * @fsp: The FCP packet whose exchanges should be canceled | |
1039 | * @error: The reason for the cancellation | |
1040 | */ | |
42e9a92f RL |
1041 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
1042 | { | |
42e9a92f | 1043 | if (fsp->seq_ptr) { |
768c72cc | 1044 | fc_exch_done(fsp->seq_ptr); |
42e9a92f RL |
1045 | fsp->seq_ptr = NULL; |
1046 | } | |
1047 | fsp->status_code = error; | |
1048 | } | |
1049 | ||
1050 | /** | |
3a3b42bf RL |
1051 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
1052 | * @lport: The local port whose exchanges should be canceled | |
1053 | * @id: The target's ID | |
1054 | * @lun: The LUN | |
1055 | * @error: The reason for cancellation | |
42e9a92f RL |
1056 | * |
1057 | * If lun or id is -1, they are ignored. | |
1058 | */ | |
3a3b42bf | 1059 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
1060 | unsigned int lun, int error) |
1061 | { | |
3a3b42bf | 1062 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
1063 | struct fc_fcp_pkt *fsp; |
1064 | struct scsi_cmnd *sc_cmd; | |
1065 | unsigned long flags; | |
1066 | ||
c1ecb90a | 1067 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1068 | restart: |
1069 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1070 | sc_cmd = fsp->cmd; | |
1071 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1072 | continue; | |
1073 | ||
1074 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1075 | continue; | |
1076 | ||
1077 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1078 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f | 1079 | |
8f2777f5 BVA |
1080 | spin_lock_bh(&fsp->scsi_pkt_lock); |
1081 | if (!(fsp->state & FC_SRB_COMPL)) { | |
1082 | fsp->state |= FC_SRB_COMPL; | |
1083 | /* | |
1084 | * TODO: dropping scsi_pkt_lock and then reacquiring | |
1085 | * again around fc_fcp_cleanup_cmd() is required, | |
1086 | * since fc_fcp_cleanup_cmd() calls into | |
1087 | * fc_seq_set_resp() and that func preempts cpu using | |
1088 | * schedule. May be schedule and related code should be | |
1089 | * removed instead of unlocking here to avoid scheduling | |
1090 | * while atomic bug. | |
1091 | */ | |
1092 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1093 | ||
42e9a92f | 1094 | fc_fcp_cleanup_cmd(fsp, error); |
8f2777f5 BVA |
1095 | |
1096 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
42e9a92f | 1097 | fc_io_compl(fsp); |
42e9a92f | 1098 | } |
8f2777f5 | 1099 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
42e9a92f RL |
1100 | |
1101 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1102 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1103 | /* |
1104 | * while we dropped the lock multiple pkts could | |
1105 | * have been released, so we have to start over. | |
1106 | */ | |
1107 | goto restart; | |
1108 | } | |
c1ecb90a | 1109 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1110 | } |
1111 | ||
3a3b42bf RL |
1112 | /** |
1113 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1114 | * @lport: The local port whose exchanges are to be aborted | |
1115 | */ | |
1116 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1117 | { |
3a3b42bf | 1118 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1119 | } |
1120 | ||
1121 | /** | |
3a3b42bf RL |
1122 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1123 | * @lport: The local port to send the FCP packet on | |
1124 | * @fsp: The FCP packet to send | |
42e9a92f | 1125 | * |
3a3b42bf | 1126 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1127 | * Locks: Called without locks held |
42e9a92f | 1128 | */ |
3a3b42bf | 1129 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1130 | { |
3a3b42bf | 1131 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1132 | unsigned long flags; |
42e9a92f RL |
1133 | int rc; |
1134 | ||
5d21aa36 | 1135 | libfc_priv(fsp->cmd)->fsp = fsp; |
42e9a92f RL |
1136 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); |
1137 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1138 | ||
e35fa8c2 | 1139 | int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); |
42e9a92f | 1140 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); |
42e9a92f | 1141 | |
c1ecb90a CL |
1142 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1143 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1144 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1145 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1146 | if (unlikely(rc)) { |
1147 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
5d21aa36 | 1148 | libfc_priv(fsp->cmd)->fsp = NULL; |
42e9a92f | 1149 | list_del(&fsp->list); |
c1ecb90a CL |
1150 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1151 | } | |
42e9a92f RL |
1152 | |
1153 | return rc; | |
1154 | } | |
1155 | ||
3a3b42bf RL |
1156 | /** |
1157 | * fc_fcp_cmd_send() - Send a FCP command | |
1158 | * @lport: The local port to send the command on | |
1159 | * @fsp: The FCP packet the command is on | |
1160 | * @resp: The handler for the response | |
1161 | */ | |
1162 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1163 | void (*resp)(struct fc_seq *, |
1164 | struct fc_frame *fp, | |
1165 | void *arg)) | |
1166 | { | |
1167 | struct fc_frame *fp; | |
1168 | struct fc_seq *seq; | |
1169 | struct fc_rport *rport; | |
3a3b42bf | 1170 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1171 | const size_t len = sizeof(fsp->cdb_cmd); |
1172 | int rc = 0; | |
1173 | ||
1174 | if (fc_fcp_lock_pkt(fsp)) | |
1175 | return 0; | |
1176 | ||
c46be11a | 1177 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1178 | if (!fp) { |
1179 | rc = -1; | |
1180 | goto unlock; | |
1181 | } | |
1182 | ||
1183 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1184 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1185 | rport = fsp->rport; |
1186 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1187 | rpriv = rport->dd_data; |
42e9a92f RL |
1188 | |
1189 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
7b2787ec | 1190 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1191 | FC_FCTL_REQ, 0); |
42e9a92f | 1192 | |
3afd2d15 | 1193 | seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0); |
42e9a92f | 1194 | if (!seq) { |
42e9a92f RL |
1195 | rc = -1; |
1196 | goto unlock; | |
1197 | } | |
42e9a92f RL |
1198 | fsp->seq_ptr = seq; |
1199 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1200 | ||
841b86f3 | 1201 | fsp->timer.function = fc_fcp_timeout; |
05fee645 | 1202 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
f2817ec2 | 1203 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
05fee645 | 1204 | |
42e9a92f RL |
1205 | unlock: |
1206 | fc_fcp_unlock_pkt(fsp); | |
1207 | return rc; | |
1208 | } | |
1209 | ||
3a3b42bf RL |
1210 | /** |
1211 | * fc_fcp_error() - Handler for FCP layer errors | |
1212 | * @fsp: The FCP packet the error is on | |
1213 | * @fp: The frame that has errored | |
42e9a92f RL |
1214 | */ |
1215 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1216 | { | |
1217 | int error = PTR_ERR(fp); | |
1218 | ||
1219 | if (fc_fcp_lock_pkt(fsp)) | |
1220 | return; | |
1221 | ||
7414705e | 1222 | if (error == -FC_EX_CLOSED) { |
a0452bb4 | 1223 | fc_fcp_retry_cmd(fsp, FC_ERROR); |
42e9a92f | 1224 | goto unlock; |
42e9a92f | 1225 | } |
7414705e | 1226 | |
42e9a92f RL |
1227 | /* |
1228 | * clear abort pending, because the lower layer | |
1229 | * decided to force completion. | |
1230 | */ | |
1231 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1232 | fsp->status_code = FC_CMD_PLOGO; | |
1233 | fc_fcp_complete_locked(fsp); | |
1234 | unlock: | |
1235 | fc_fcp_unlock_pkt(fsp); | |
1236 | } | |
1237 | ||
3a3b42bf RL |
1238 | /** |
1239 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1240 | * @fsp: The FCP packet to abort on | |
1241 | * | |
1242 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1243 | */ |
c340111d | 1244 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1245 | { |
1246 | int rc = FAILED; | |
fa79dbdb | 1247 | unsigned long ticks_left; |
42e9a92f | 1248 | |
57d3ec7e HR |
1249 | FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state); |
1250 | if (fc_fcp_send_abort(fsp)) { | |
1251 | FC_FCP_DBG(fsp, "failed to send abort\n"); | |
42e9a92f | 1252 | return FAILED; |
57d3ec7e | 1253 | } |
42e9a92f | 1254 | |
d11b44ef HR |
1255 | if (fsp->state & FC_SRB_ABORTED) { |
1256 | FC_FCP_DBG(fsp, "target abort cmd completed\n"); | |
1257 | return SUCCESS; | |
1258 | } | |
1259 | ||
42e9a92f RL |
1260 | init_completion(&fsp->tm_done); |
1261 | fsp->wait_for_comp = 1; | |
1262 | ||
1263 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
fa79dbdb HD |
1264 | ticks_left = wait_for_completion_timeout(&fsp->tm_done, |
1265 | FC_SCSI_TM_TOV); | |
42e9a92f RL |
1266 | spin_lock_bh(&fsp->scsi_pkt_lock); |
1267 | fsp->wait_for_comp = 0; | |
1268 | ||
fa79dbdb | 1269 | if (!ticks_left) { |
7414705e | 1270 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f | 1271 | } else if (fsp->state & FC_SRB_ABORTED) { |
7414705e | 1272 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1273 | rc = SUCCESS; |
1274 | fc_fcp_complete_locked(fsp); | |
1275 | } | |
1276 | ||
1277 | return rc; | |
1278 | } | |
1279 | ||
3a3b42bf RL |
1280 | /** |
1281 | * fc_lun_reset_send() - Send LUN reset command | |
ebb40ab6 | 1282 | * @t: Timer context used to fetch the FSP packet |
42e9a92f | 1283 | */ |
1f0849da | 1284 | static void fc_lun_reset_send(struct timer_list *t) |
42e9a92f | 1285 | { |
1f0849da | 1286 | struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); |
3a3b42bf | 1287 | struct fc_lport *lport = fsp->lp; |
e0883a3c | 1288 | |
3a3b42bf | 1289 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { |
42e9a92f RL |
1290 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1291 | return; | |
1292 | if (fc_fcp_lock_pkt(fsp)) | |
1293 | return; | |
841b86f3 | 1294 | fsp->timer.function = fc_lun_reset_send; |
f2817ec2 | 1295 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1296 | fc_fcp_unlock_pkt(fsp); |
1297 | } | |
1298 | } | |
1299 | ||
3a3b42bf RL |
1300 | /** |
1301 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1302 | * and wait for the reply | |
b595076a | 1303 | * @lport: The local port to sent the command on |
3a3b42bf RL |
1304 | * @fsp: The FCP packet that identifies the LUN to be reset |
1305 | * @id: The SCSI command ID | |
1306 | * @lun: The LUN ID to be reset | |
42e9a92f | 1307 | */ |
3a3b42bf | 1308 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1309 | unsigned int id, unsigned int lun) |
1310 | { | |
1311 | int rc; | |
1312 | ||
1313 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1314 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
e35fa8c2 | 1315 | int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); |
42e9a92f RL |
1316 | |
1317 | fsp->wait_for_comp = 1; | |
1318 | init_completion(&fsp->tm_done); | |
1319 | ||
1f0849da | 1320 | fc_lun_reset_send(&fsp->timer); |
42e9a92f RL |
1321 | |
1322 | /* | |
1323 | * wait for completion of reset | |
1324 | * after that make sure all commands are terminated | |
1325 | */ | |
1326 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1327 | ||
1328 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1329 | fsp->state |= FC_SRB_COMPL; | |
1330 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1331 | ||
1332 | del_timer_sync(&fsp->timer); | |
1333 | ||
1334 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1335 | if (fsp->seq_ptr) { | |
768c72cc | 1336 | fc_exch_done(fsp->seq_ptr); |
42e9a92f RL |
1337 | fsp->seq_ptr = NULL; |
1338 | } | |
1339 | fsp->wait_for_comp = 0; | |
1340 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1341 | ||
1342 | if (!rc) { | |
3a3b42bf | 1343 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1344 | return FAILED; |
1345 | } | |
1346 | ||
1347 | /* cdb_status holds the tmf's rsp code */ | |
1348 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1349 | return FAILED; | |
1350 | ||
3a3b42bf RL |
1351 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1352 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1353 | return SUCCESS; |
1354 | } | |
1355 | ||
3a3b42bf | 1356 | /** |
25985edc | 1357 | * fc_tm_done() - Task Management response handler |
3a3b42bf RL |
1358 | * @seq: The sequence that the response is on |
1359 | * @fp: The response frame | |
1360 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1361 | */ |
1362 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1363 | { | |
1364 | struct fc_fcp_pkt *fsp = arg; | |
1365 | struct fc_frame_header *fh; | |
1366 | ||
1367 | if (IS_ERR(fp)) { | |
1368 | /* | |
1369 | * If there is an error just let it timeout or wait | |
1370 | * for TMF to be aborted if it timedout. | |
1371 | * | |
1372 | * scsi-eh will escalate for when either happens. | |
1373 | */ | |
e4a9a982 | 1374 | return; |
42e9a92f RL |
1375 | } |
1376 | ||
1377 | if (fc_fcp_lock_pkt(fsp)) | |
b5fe5e95 | 1378 | goto out; |
42e9a92f RL |
1379 | |
1380 | /* | |
1381 | * raced with eh timeout handler. | |
1382 | */ | |
b5fe5e95 YZ |
1383 | if (!fsp->seq_ptr || !fsp->wait_for_comp) |
1384 | goto out_unlock; | |
42e9a92f RL |
1385 | |
1386 | fh = fc_frame_header_get(fp); | |
1387 | if (fh->fh_type != FC_TYPE_BLS) | |
1388 | fc_fcp_resp(fsp, fp); | |
1389 | fsp->seq_ptr = NULL; | |
768c72cc | 1390 | fc_exch_done(seq); |
b5fe5e95 | 1391 | out_unlock: |
42e9a92f | 1392 | fc_fcp_unlock_pkt(fsp); |
b5fe5e95 YZ |
1393 | out: |
1394 | fc_frame_free(fp); | |
42e9a92f RL |
1395 | } |
1396 | ||
3a3b42bf RL |
1397 | /** |
1398 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1399 | * @lport: The local port to be cleaned up | |
1400 | */ | |
1401 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1402 | { |
3a3b42bf | 1403 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1404 | } |
1405 | ||
3a3b42bf RL |
1406 | /** |
1407 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
ebb40ab6 | 1408 | * @t: Timer context used to fetch the FSP packet |
42e9a92f | 1409 | * |
3a3b42bf RL |
1410 | * If REC is supported then just issue it and return. The REC exchange will |
1411 | * complete or time out and recovery can continue at that point. Otherwise, | |
1412 | * if the response has been received without all the data it has been | |
1413 | * ER_TIMEOUT since the response was received. If the response has not been | |
1414 | * received we see if data was received recently. If it has been then we | |
1415 | * continue waiting, otherwise, we abort the command. | |
42e9a92f | 1416 | */ |
1f0849da | 1417 | static void fc_fcp_timeout(struct timer_list *t) |
42e9a92f | 1418 | { |
1f0849da | 1419 | struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); |
42e9a92f | 1420 | struct fc_rport *rport = fsp->rport; |
3a3b42bf | 1421 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1422 | |
1423 | if (fc_fcp_lock_pkt(fsp)) | |
1424 | return; | |
1425 | ||
1426 | if (fsp->cdb_cmd.fc_tm_flags) | |
1427 | goto unlock; | |
1428 | ||
ad3120cf HR |
1429 | if (fsp->lp->qfull) { |
1430 | FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n", | |
1431 | fsp->timer_delay); | |
841b86f3 | 1432 | fsp->timer.function = fc_fcp_timeout; |
ad3120cf HR |
1433 | fc_fcp_timer_set(fsp, fsp->timer_delay); |
1434 | goto unlock; | |
1435 | } | |
1436 | FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n", | |
1437 | fsp->timer_delay, rpriv->flags, fsp->state); | |
42e9a92f RL |
1438 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; |
1439 | ||
5b97fabd | 1440 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
a752359f | 1441 | fc_fcp_rec(fsp); |
5b97fabd VD |
1442 | else if (fsp->state & FC_SRB_RCV_STATUS) |
1443 | fc_fcp_complete_locked(fsp); | |
42e9a92f | 1444 | else |
ac17ea8d | 1445 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1446 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1447 | unlock: | |
1448 | fc_fcp_unlock_pkt(fsp); | |
1449 | } | |
1450 | ||
3a3b42bf RL |
1451 | /** |
1452 | * fc_fcp_rec() - Send a REC ELS request | |
1453 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1454 | */ |
1455 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1456 | { | |
3a3b42bf | 1457 | struct fc_lport *lport; |
42e9a92f RL |
1458 | struct fc_frame *fp; |
1459 | struct fc_rport *rport; | |
3a3b42bf | 1460 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1461 | |
3a3b42bf | 1462 | lport = fsp->lp; |
42e9a92f | 1463 | rport = fsp->rport; |
3a3b42bf RL |
1464 | rpriv = rport->dd_data; |
1465 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1466 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1467 | fsp->io_status = 0; |
42e9a92f RL |
1468 | fc_fcp_complete_locked(fsp); |
1469 | return; | |
1470 | } | |
e0883a3c | 1471 | |
c46be11a | 1472 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1473 | if (!fp) |
1474 | goto retry; | |
1475 | ||
1476 | fr_seq(fp) = fsp->seq_ptr; | |
1477 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
7b2787ec | 1478 | rpriv->local_port->port_id, FC_TYPE_ELS, |
24f089e2 | 1479 | FC_FCTL_REQ, 0); |
3a3b42bf RL |
1480 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1481 | fc_fcp_rec_resp, fsp, | |
3a91090f | 1482 | 2 * lport->r_a_tov)) { |
42e9a92f RL |
1483 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1484 | return; | |
1485 | } | |
42e9a92f RL |
1486 | retry: |
1487 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
3a91090f | 1488 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f | 1489 | else |
ac17ea8d | 1490 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1491 | } |
1492 | ||
3a3b42bf RL |
1493 | /** |
1494 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1495 | * @seq: The sequence the response is on | |
1496 | * @fp: The response frame | |
1497 | * @arg: The FCP packet the response is on | |
1498 | * | |
1499 | * If the response is a reject then the scsi layer will handle | |
1500 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1501 | * set the timeout and return. If the I/O was completed then complete the | |
1502 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1503 | */ |
1504 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1505 | { | |
1506 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1507 | struct fc_els_rec_acc *recp; | |
1508 | struct fc_els_ls_rjt *rjt; | |
1509 | u32 e_stat; | |
1510 | u8 opcode; | |
1511 | u32 offset; | |
1512 | enum dma_data_direction data_dir; | |
1513 | enum fc_rctl r_ctl; | |
3a3b42bf | 1514 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1515 | |
1516 | if (IS_ERR(fp)) { | |
1517 | fc_fcp_rec_error(fsp, fp); | |
1518 | return; | |
1519 | } | |
1520 | ||
1521 | if (fc_fcp_lock_pkt(fsp)) | |
1522 | goto out; | |
1523 | ||
1524 | fsp->recov_retry = 0; | |
1525 | opcode = fc_frame_payload_op(fp); | |
1526 | if (opcode == ELS_LS_RJT) { | |
1527 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1528 | switch (rjt->er_reason) { | |
1529 | default: | |
57d3ec7e HR |
1530 | FC_FCP_DBG(fsp, |
1531 | "device %x invalid REC reject %d/%d\n", | |
7414705e RL |
1532 | fsp->rport->port_id, rjt->er_reason, |
1533 | rjt->er_explan); | |
df561f66 | 1534 | fallthrough; |
42e9a92f | 1535 | case ELS_RJT_UNSUP: |
7414705e | 1536 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1537 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1538 | /* |
1539 | * if we do not spport RECs or got some bogus | |
1540 | * reason then resetup timer so we check for | |
1541 | * making progress. | |
1542 | */ | |
3a3b42bf | 1543 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1544 | break; |
1545 | case ELS_RJT_LOGIC: | |
1546 | case ELS_RJT_UNAB: | |
57d3ec7e HR |
1547 | FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n", |
1548 | fsp->rport->port_id, rjt->er_reason, | |
1549 | rjt->er_explan); | |
42e9a92f | 1550 | /* |
9ca1e182 HR |
1551 | * If response got lost or is stuck in the |
1552 | * queue somewhere we have no idea if and when | |
1553 | * the response will be received. So quarantine | |
1554 | * the xid and retry the command. | |
42e9a92f | 1555 | */ |
9ca1e182 HR |
1556 | if (rjt->er_explan == ELS_EXPL_OXID_RXID) { |
1557 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); | |
1558 | ep->state |= FC_EX_QUARANTINE; | |
a0452bb4 HR |
1559 | fsp->state |= FC_SRB_ABORTED; |
1560 | fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); | |
42e9a92f RL |
1561 | break; |
1562 | } | |
a0452bb4 | 1563 | fc_fcp_recovery(fsp, FC_TRANS_RESET); |
42e9a92f RL |
1564 | break; |
1565 | } | |
1566 | } else if (opcode == ELS_LS_ACC) { | |
1567 | if (fsp->state & FC_SRB_ABORTED) | |
1568 | goto unlock_out; | |
1569 | ||
1570 | data_dir = fsp->cmd->sc_data_direction; | |
1571 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1572 | offset = ntohl(recp->reca_fc4value); | |
1573 | e_stat = ntohl(recp->reca_e_stat); | |
1574 | ||
1575 | if (e_stat & ESB_ST_COMPLETE) { | |
1576 | ||
1577 | /* | |
1578 | * The exchange is complete. | |
1579 | * | |
1580 | * For output, we must've lost the response. | |
1581 | * For input, all data must've been sent. | |
1582 | * We lost may have lost the response | |
1583 | * (and a confirmation was requested) and maybe | |
1584 | * some data. | |
1585 | * | |
1586 | * If all data received, send SRR | |
1587 | * asking for response. If partial data received, | |
1588 | * or gaps, SRR requests data at start of gap. | |
1589 | * Recovery via SRR relies on in-order-delivery. | |
1590 | */ | |
1591 | if (data_dir == DMA_TO_DEVICE) { | |
1592 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1593 | } else if (fsp->xfer_contig_end == offset) { | |
1594 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1595 | } else { | |
1596 | offset = fsp->xfer_contig_end; | |
1597 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1598 | } | |
1599 | fc_fcp_srr(fsp, r_ctl, offset); | |
1600 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
42e9a92f RL |
1601 | /* |
1602 | * The remote port has the initiative, so just | |
1603 | * keep waiting for it to complete. | |
1604 | */ | |
f2817ec2 | 1605 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1606 | } else { |
1607 | ||
1608 | /* | |
1609 | * The exchange is incomplete, we have seq. initiative. | |
1610 | * Lost response with requested confirmation, | |
1611 | * lost confirmation, lost transfer ready or | |
1612 | * lost write data. | |
1613 | * | |
1614 | * For output, if not all data was received, ask | |
1615 | * for transfer ready to be repeated. | |
1616 | * | |
1617 | * If we received or sent all the data, send SRR to | |
1618 | * request response. | |
1619 | * | |
1620 | * If we lost a response, we may have lost some read | |
1621 | * data as well. | |
1622 | */ | |
1623 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1624 | if (data_dir == DMA_TO_DEVICE) { | |
1625 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1626 | if (offset < fsp->data_len) | |
1627 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1628 | } else if (offset == fsp->xfer_contig_end) { | |
1629 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1630 | } else if (fsp->xfer_contig_end < offset) { | |
1631 | offset = fsp->xfer_contig_end; | |
1632 | } | |
1633 | fc_fcp_srr(fsp, r_ctl, offset); | |
1634 | } | |
1635 | } | |
1636 | unlock_out: | |
1637 | fc_fcp_unlock_pkt(fsp); | |
1638 | out: | |
1639 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1640 | fc_frame_free(fp); | |
1641 | } | |
1642 | ||
3a3b42bf RL |
1643 | /** |
1644 | * fc_fcp_rec_error() - Handler for REC errors | |
1645 | * @fsp: The FCP packet the error is on | |
1646 | * @fp: The REC frame | |
42e9a92f RL |
1647 | */ |
1648 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1649 | { | |
1650 | int error = PTR_ERR(fp); | |
1651 | ||
1652 | if (fc_fcp_lock_pkt(fsp)) | |
1653 | goto out; | |
1654 | ||
1655 | switch (error) { | |
1656 | case -FC_EX_CLOSED: | |
57d3ec7e HR |
1657 | FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n", |
1658 | fsp, fsp->rport->port_id); | |
a0452bb4 | 1659 | fc_fcp_retry_cmd(fsp, FC_ERROR); |
42e9a92f RL |
1660 | break; |
1661 | ||
1662 | default: | |
ce8b5df0 | 1663 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1664 | fsp, fsp->rport->port_id, error); |
42e9a92f | 1665 | fsp->status_code = FC_CMD_PLOGO; |
df561f66 | 1666 | fallthrough; |
42e9a92f RL |
1667 | |
1668 | case -FC_EX_TIMEOUT: | |
1669 | /* | |
1670 | * Assume REC or LS_ACC was lost. | |
1671 | * The exchange manager will have aborted REC, so retry. | |
1672 | */ | |
57d3ec7e HR |
1673 | FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n", |
1674 | fsp, fsp->rport->port_id, fsp->recov_retry, | |
7414705e | 1675 | FC_MAX_RECOV_RETRY); |
42e9a92f RL |
1676 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1677 | fc_fcp_rec(fsp); | |
1678 | else | |
53122a49 | 1679 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1680 | break; |
1681 | } | |
1682 | fc_fcp_unlock_pkt(fsp); | |
1683 | out: | |
1684 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1685 | } | |
1686 | ||
3a3b42bf | 1687 | /** |
5c12c418 VD |
1688 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1689 | * @fsp: The FCP pkt that needs to be aborted | |
ebb40ab6 | 1690 | * @code: The FCP status code to set |
42e9a92f | 1691 | */ |
ac17ea8d | 1692 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) |
42e9a92f | 1693 | { |
57d3ec7e | 1694 | FC_FCP_DBG(fsp, "start recovery code %x\n", code); |
ac17ea8d | 1695 | fsp->status_code = code; |
42e9a92f RL |
1696 | fsp->cdb_status = 0; |
1697 | fsp->io_status = 0; | |
b57c4db5 HR |
1698 | if (!fsp->cmd) |
1699 | /* | |
1700 | * Only abort non-scsi commands; otherwise let the | |
1701 | * scsi command timer fire and scsi-ml escalate. | |
1702 | */ | |
1703 | fc_fcp_send_abort(fsp); | |
42e9a92f RL |
1704 | } |
1705 | ||
3a3b42bf RL |
1706 | /** |
1707 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1708 | * @fsp: The FCP packet the SRR is to be sent on | |
1709 | * @r_ctl: The R_CTL field for the SRR request | |
ebb40ab6 | 1710 | * @offset: The SRR relative offset |
42e9a92f RL |
1711 | * This is called after receiving status but insufficient data, or |
1712 | * when expecting status but the request has timed out. | |
1713 | */ | |
1714 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1715 | { | |
3a3b42bf | 1716 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1717 | struct fc_rport *rport; |
3a3b42bf | 1718 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1719 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1720 | struct fc_seq *seq; | |
1721 | struct fcp_srr *srr; | |
1722 | struct fc_frame *fp; | |
42e9a92f RL |
1723 | |
1724 | rport = fsp->rport; | |
3a3b42bf | 1725 | rpriv = rport->dd_data; |
42e9a92f | 1726 | |
3a3b42bf RL |
1727 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1728 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1729 | goto retry; /* shouldn't happen */ |
c46be11a | 1730 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1731 | if (!fp) |
1732 | goto retry; | |
1733 | ||
1734 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1735 | memset(srr, 0, sizeof(*srr)); | |
1736 | srr->srr_op = ELS_SRR; | |
1737 | srr->srr_ox_id = htons(ep->oxid); | |
1738 | srr->srr_rx_id = htons(ep->rxid); | |
1739 | srr->srr_r_ctl = r_ctl; | |
1740 | srr->srr_rel_off = htonl(offset); | |
1741 | ||
1742 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
7b2787ec | 1743 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1744 | FC_FCTL_REQ, 0); |
42e9a92f | 1745 | |
3afd2d15 HR |
1746 | seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp, |
1747 | fc_fcp_pkt_destroy, | |
1748 | fsp, get_fsp_rec_tov(fsp)); | |
8f550f93 | 1749 | if (!seq) |
42e9a92f | 1750 | goto retry; |
8f550f93 | 1751 | |
42e9a92f RL |
1752 | fsp->recov_seq = seq; |
1753 | fsp->xfer_len = offset; | |
1754 | fsp->xfer_contig_end = offset; | |
1755 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1756 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1757 | return; | |
1758 | retry: | |
a0452bb4 | 1759 | fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); |
42e9a92f RL |
1760 | } |
1761 | ||
3a3b42bf RL |
1762 | /** |
1763 | * fc_fcp_srr_resp() - Handler for SRR response | |
1764 | * @seq: The sequence the SRR is on | |
1765 | * @fp: The SRR frame | |
1766 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1767 | */ |
1768 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1769 | { | |
1770 | struct fc_fcp_pkt *fsp = arg; | |
1771 | struct fc_frame_header *fh; | |
1772 | ||
1773 | if (IS_ERR(fp)) { | |
1774 | fc_fcp_srr_error(fsp, fp); | |
1775 | return; | |
1776 | } | |
1777 | ||
1778 | if (fc_fcp_lock_pkt(fsp)) | |
1779 | goto out; | |
1780 | ||
1781 | fh = fc_frame_header_get(fp); | |
1782 | /* | |
768c72cc | 1783 | * BUG? fc_fcp_srr_error calls fc_exch_done which would release |
42e9a92f | 1784 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, |
768c72cc | 1785 | * then fc_exch_timeout would be sending an abort. The fc_exch_done |
42e9a92f RL |
1786 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing |
1787 | * an abort response though. | |
1788 | */ | |
1789 | if (fh->fh_type == FC_TYPE_BLS) { | |
1790 | fc_fcp_unlock_pkt(fsp); | |
1791 | return; | |
1792 | } | |
1793 | ||
42e9a92f RL |
1794 | switch (fc_frame_payload_op(fp)) { |
1795 | case ELS_LS_ACC: | |
1796 | fsp->recov_retry = 0; | |
f2817ec2 | 1797 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1798 | break; |
1799 | case ELS_LS_RJT: | |
1800 | default: | |
ac17ea8d | 1801 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1802 | break; |
1803 | } | |
1804 | fc_fcp_unlock_pkt(fsp); | |
42e9a92f | 1805 | out: |
768c72cc | 1806 | fc_exch_done(seq); |
42e9a92f | 1807 | fc_frame_free(fp); |
42e9a92f RL |
1808 | } |
1809 | ||
3a3b42bf RL |
1810 | /** |
1811 | * fc_fcp_srr_error() - Handler for SRR errors | |
1812 | * @fsp: The FCP packet that the SRR error is on | |
1813 | * @fp: The SRR frame | |
1814 | */ | |
42e9a92f RL |
1815 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1816 | { | |
1817 | if (fc_fcp_lock_pkt(fsp)) | |
1818 | goto out; | |
42e9a92f RL |
1819 | switch (PTR_ERR(fp)) { |
1820 | case -FC_EX_TIMEOUT: | |
57d3ec7e | 1821 | FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry); |
42e9a92f RL |
1822 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1823 | fc_fcp_rec(fsp); | |
1824 | else | |
ac17ea8d | 1825 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1826 | break; |
1827 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
57d3ec7e | 1828 | FC_FCP_DBG(fsp, "SRR error, exchange closed\n"); |
df561f66 | 1829 | fallthrough; |
42e9a92f | 1830 | default: |
a0452bb4 | 1831 | fc_fcp_retry_cmd(fsp, FC_ERROR); |
42e9a92f RL |
1832 | break; |
1833 | } | |
1834 | fc_fcp_unlock_pkt(fsp); | |
1835 | out: | |
768c72cc | 1836 | fc_exch_done(fsp->recov_seq); |
42e9a92f RL |
1837 | } |
1838 | ||
3a3b42bf RL |
1839 | /** |
1840 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1841 | * @lport: The local port to be checked | |
1842 | */ | |
1843 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1844 | { |
1845 | /* lock ? */ | |
3a3b42bf RL |
1846 | return (lport->state == LPORT_ST_READY) && |
1847 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1848 | } |
1849 | ||
1850 | /** | |
3a3b42bf | 1851 | * fc_queuecommand() - The queuecommand function of the SCSI template |
04885b16 | 1852 | * @shost: The Scsi_Host that the command was issued to |
ebb40ab6 | 1853 | * @sc_cmd: The scsi_cmnd to be executed |
42e9a92f | 1854 | * |
04885b16 | 1855 | * This is the i/o strategy routine, called by the SCSI layer. |
42e9a92f | 1856 | */ |
04885b16 | 1857 | int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) |
42e9a92f | 1858 | { |
04885b16 | 1859 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
1860 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1861 | struct fc_fcp_pkt *fsp; | |
42e9a92f RL |
1862 | int rval; |
1863 | int rc = 0; | |
42e9a92f | 1864 | |
42e9a92f RL |
1865 | rval = fc_remote_port_chkready(rport); |
1866 | if (rval) { | |
1867 | sc_cmd->result = rval; | |
e0f63b21 | 1868 | scsi_done(sc_cmd); |
be948fc3 | 1869 | return 0; |
42e9a92f RL |
1870 | } |
1871 | ||
1872 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1873 | /* | |
1874 | * rport is transitioning from blocked/deleted to | |
1875 | * online | |
1876 | */ | |
1877 | sc_cmd->result = DID_IMM_RETRY << 16; | |
e0f63b21 | 1878 | scsi_done(sc_cmd); |
42e9a92f RL |
1879 | goto out; |
1880 | } | |
1881 | ||
3a3b42bf | 1882 | if (!fc_fcp_lport_queue_ready(lport)) { |
5d339d16 | 1883 | if (lport->qfull) { |
c1061255 HR |
1884 | if (fc_fcp_can_queue_ramp_down(lport)) |
1885 | shost_printk(KERN_ERR, lport->host, | |
1886 | "libfc: queue full, " | |
1887 | "reducing can_queue to %d.\n", | |
1888 | lport->host->can_queue); | |
5d339d16 | 1889 | } |
42e9a92f RL |
1890 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1891 | goto out; | |
1892 | } | |
1893 | ||
3a3b42bf | 1894 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1895 | if (fsp == NULL) { |
1896 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1897 | goto out; | |
1898 | } | |
1899 | ||
1900 | /* | |
1901 | * build the libfc request pkt | |
1902 | */ | |
1903 | fsp->cmd = sc_cmd; /* save the cmd */ | |
42e9a92f | 1904 | fsp->rport = rport; /* set the remote port ptr */ |
42e9a92f RL |
1905 | |
1906 | /* | |
1907 | * set up the transfer length | |
1908 | */ | |
1909 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1910 | fsp->xfer_len = 0; | |
1911 | ||
1912 | /* | |
1913 | * setup the data direction | |
1914 | */ | |
42e9a92f RL |
1915 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1916 | fsp->req_flags = FC_SRB_READ; | |
a912460e SAS |
1917 | this_cpu_inc(lport->stats->InputRequests); |
1918 | this_cpu_add(lport->stats->InputBytes, fsp->data_len); | |
42e9a92f RL |
1919 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
1920 | fsp->req_flags = FC_SRB_WRITE; | |
a912460e SAS |
1921 | this_cpu_inc(lport->stats->OutputRequests); |
1922 | this_cpu_add(lport->stats->OutputBytes, fsp->data_len); | |
42e9a92f RL |
1923 | } else { |
1924 | fsp->req_flags = 0; | |
a912460e | 1925 | this_cpu_inc(lport->stats->ControlRequests); |
42e9a92f RL |
1926 | } |
1927 | ||
42e9a92f RL |
1928 | /* |
1929 | * send it to the lower layer | |
1930 | * if we get -1 return then put the request in the pending | |
1931 | * queue. | |
1932 | */ | |
3a3b42bf | 1933 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1934 | if (rval != 0) { |
1935 | fsp->state = FC_SRB_FREE; | |
1936 | fc_fcp_pkt_release(fsp); | |
1937 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1938 | } | |
1939 | out: | |
1940 | return rc; | |
1941 | } | |
1942 | EXPORT_SYMBOL(fc_queuecommand); | |
1943 | ||
1944 | /** | |
3a3b42bf RL |
1945 | * fc_io_compl() - Handle responses for completed commands |
1946 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1947 | * |
3a3b42bf | 1948 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1949 | * The fcp packet lock must be held when calling. |
1950 | */ | |
1951 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1952 | { | |
1953 | struct fc_fcp_internal *si; | |
1954 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1955 | struct fc_lport *lport; |
42e9a92f RL |
1956 | unsigned long flags; |
1957 | ||
b277d2aa YZ |
1958 | /* release outstanding ddp context */ |
1959 | fc_fcp_ddp_done(fsp); | |
1960 | ||
42e9a92f RL |
1961 | fsp->state |= FC_SRB_COMPL; |
1962 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1963 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1964 | del_timer_sync(&fsp->timer); | |
1965 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1966 | } | |
1967 | ||
3a3b42bf RL |
1968 | lport = fsp->lp; |
1969 | si = fc_get_scsi_internal(lport); | |
42e9a92f RL |
1970 | |
1971 | /* | |
84c3e1ad VD |
1972 | * if can_queue ramp down is done then try can_queue ramp up |
1973 | * since commands are completing now. | |
42e9a92f | 1974 | */ |
84c3e1ad VD |
1975 | if (si->last_can_queue_ramp_down_time) |
1976 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1977 | |
1978 | sc_cmd = fsp->cmd; | |
5d21aa36 | 1979 | libfc_priv(sc_cmd)->status = fsp->cdb_status; |
42e9a92f RL |
1980 | switch (fsp->status_code) { |
1981 | case FC_COMPLETE: | |
1982 | if (fsp->cdb_status == 0) { | |
1983 | /* | |
1984 | * good I/O status | |
1985 | */ | |
1986 | sc_cmd->result = DID_OK << 16; | |
1987 | if (fsp->scsi_resid) | |
5d21aa36 | 1988 | libfc_priv(sc_cmd)->resid_len = fsp->scsi_resid; |
42e9a92f RL |
1989 | } else { |
1990 | /* | |
1991 | * transport level I/O was ok but scsi | |
1992 | * has non zero status | |
1993 | */ | |
1994 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1995 | } | |
1996 | break; | |
1997 | case FC_ERROR: | |
b3ef990c RL |
1998 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1999 | "due to FC_ERROR\n"); | |
42e9a92f RL |
2000 | sc_cmd->result = DID_ERROR << 16; |
2001 | break; | |
2002 | case FC_DATA_UNDRUN: | |
26d9cab5 | 2003 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
2004 | /* |
2005 | * scsi status is good but transport level | |
26d9cab5 | 2006 | * underrun. |
42e9a92f | 2007 | */ |
b3ef990c RL |
2008 | if (fsp->state & FC_SRB_RCV_STATUS) { |
2009 | sc_cmd->result = DID_OK << 16; | |
2010 | } else { | |
2011 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
2012 | " due to FC_DATA_UNDRUN (trans)\n"); | |
2013 | sc_cmd->result = DID_ERROR << 16; | |
2014 | } | |
42e9a92f RL |
2015 | } else { |
2016 | /* | |
2017 | * scsi got underrun, this is an error | |
2018 | */ | |
b3ef990c RL |
2019 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2020 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
5d21aa36 | 2021 | libfc_priv(sc_cmd)->resid_len = fsp->scsi_resid; |
42e9a92f RL |
2022 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
2023 | } | |
2024 | break; | |
2025 | case FC_DATA_OVRRUN: | |
2026 | /* | |
2027 | * overrun is an error | |
2028 | */ | |
b3ef990c RL |
2029 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2030 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
2031 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
2032 | break; | |
2033 | case FC_CMD_ABORTED: | |
0f4c16a2 HR |
2034 | if (host_byte(sc_cmd->result) == DID_TIME_OUT) |
2035 | FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml " | |
2036 | "due to FC_CMD_ABORTED\n"); | |
2037 | else { | |
2038 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " | |
2039 | "due to FC_CMD_ABORTED\n"); | |
2040 | set_host_byte(sc_cmd, DID_ERROR); | |
2041 | } | |
2042 | sc_cmd->result |= fsp->io_status; | |
42e9a92f | 2043 | break; |
42e9a92f | 2044 | case FC_CMD_RESET: |
ac17ea8d | 2045 | FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " |
2046 | "due to FC_CMD_RESET\n"); | |
42e9a92f RL |
2047 | sc_cmd->result = (DID_RESET << 16); |
2048 | break; | |
a0452bb4 HR |
2049 | case FC_TRANS_RESET: |
2050 | FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml " | |
2051 | "due to FC_TRANS_RESET\n"); | |
2052 | sc_cmd->result = (DID_SOFT_ERROR << 16); | |
2053 | break; | |
42e9a92f | 2054 | case FC_HRD_ERROR: |
ac17ea8d | 2055 | FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " |
2056 | "due to FC_HRD_ERROR\n"); | |
42e9a92f RL |
2057 | sc_cmd->result = (DID_NO_CONNECT << 16); |
2058 | break; | |
ac17ea8d | 2059 | case FC_CRC_ERROR: |
2060 | FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " | |
2061 | "due to FC_CRC_ERROR\n"); | |
2062 | sc_cmd->result = (DID_PARITY << 16); | |
2063 | break; | |
2064 | case FC_TIMED_OUT: | |
be40572c | 2065 | FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml " |
ac17ea8d | 2066 | "due to FC_TIMED_OUT\n"); |
be40572c | 2067 | sc_cmd->result = (DID_TIME_OUT << 16); |
ac17ea8d | 2068 | break; |
42e9a92f | 2069 | default: |
b3ef990c RL |
2070 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2071 | "due to unknown error\n"); | |
42e9a92f RL |
2072 | sc_cmd->result = (DID_ERROR << 16); |
2073 | break; | |
2074 | } | |
2075 | ||
75eee725 VD |
2076 | if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) |
2077 | sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); | |
e0d93c5b | 2078 | |
c1ecb90a | 2079 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f | 2080 | list_del(&fsp->list); |
5d21aa36 | 2081 | libfc_priv(sc_cmd)->fsp = NULL; |
8b7ac2bb | 2082 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
e0f63b21 | 2083 | scsi_done(sc_cmd); |
42e9a92f RL |
2084 | |
2085 | /* release ref from initial allocation in queue command */ | |
2086 | fc_fcp_pkt_release(fsp); | |
2087 | } | |
2088 | ||
42e9a92f | 2089 | /** |
34f42a07 | 2090 | * fc_eh_abort() - Abort a command |
3a3b42bf | 2091 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 2092 | * |
3a3b42bf RL |
2093 | * From SCSI host template. |
2094 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
2095 | */ |
2096 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
2097 | { | |
2098 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 2099 | struct fc_lport *lport; |
8b7ac2bb | 2100 | struct fc_fcp_internal *si; |
42e9a92f RL |
2101 | int rc = FAILED; |
2102 | unsigned long flags; | |
21cc0bd3 VD |
2103 | int rval; |
2104 | ||
2105 | rval = fc_block_scsi_eh(sc_cmd); | |
2106 | if (rval) | |
2107 | return rval; | |
42e9a92f | 2108 | |
3a3b42bf RL |
2109 | lport = shost_priv(sc_cmd->device->host); |
2110 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2111 | return rc; |
3a3b42bf | 2112 | else if (!lport->link_up) |
42e9a92f RL |
2113 | return rc; |
2114 | ||
8b7ac2bb VD |
2115 | si = fc_get_scsi_internal(lport); |
2116 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
5d21aa36 | 2117 | fsp = libfc_priv(sc_cmd)->fsp; |
42e9a92f RL |
2118 | if (!fsp) { |
2119 | /* command completed while scsi eh was setting up */ | |
3c2c3bf2 | 2120 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2121 | return SUCCESS; |
2122 | } | |
83a35e36 | 2123 | /* grab a ref so the fsp and sc_cmd cannot be released from under us */ |
42e9a92f | 2124 | fc_fcp_pkt_hold(fsp); |
8b7ac2bb | 2125 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2126 | |
2127 | if (fc_fcp_lock_pkt(fsp)) { | |
2128 | /* completed while we were waiting for timer to be deleted */ | |
2129 | rc = SUCCESS; | |
2130 | goto release_pkt; | |
2131 | } | |
2132 | ||
c340111d | 2133 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2134 | fc_fcp_unlock_pkt(fsp); |
2135 | ||
2136 | release_pkt: | |
2137 | fc_fcp_pkt_release(fsp); | |
2138 | return rc; | |
2139 | } | |
2140 | EXPORT_SYMBOL(fc_eh_abort); | |
2141 | ||
2142 | /** | |
3a3b42bf RL |
2143 | * fc_eh_device_reset() - Reset a single LUN |
2144 | * @sc_cmd: The SCSI command which identifies the device whose | |
2145 | * LUN is to be reset | |
42e9a92f | 2146 | * |
3a3b42bf | 2147 | * Set from SCSI host template. |
42e9a92f RL |
2148 | */ |
2149 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2150 | { | |
3a3b42bf | 2151 | struct fc_lport *lport; |
42e9a92f RL |
2152 | struct fc_fcp_pkt *fsp; |
2153 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2154 | int rc = FAILED; | |
42e9a92f RL |
2155 | int rval; |
2156 | ||
21cc0bd3 | 2157 | rval = fc_block_scsi_eh(sc_cmd); |
42e9a92f | 2158 | if (rval) |
21cc0bd3 | 2159 | return rval; |
42e9a92f | 2160 | |
3a3b42bf | 2161 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2162 | |
3a3b42bf | 2163 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2164 | return rc; |
2165 | ||
ce8b5df0 | 2166 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2167 | |
3a3b42bf | 2168 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2169 | if (fsp == NULL) { |
7414705e | 2170 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2171 | goto out; |
2172 | } | |
2173 | ||
2174 | /* | |
2175 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2176 | * the sc passed in is not setup for execution like when sent | |
2177 | * through the queuecommand callout. | |
2178 | */ | |
42e9a92f RL |
2179 | fsp->rport = rport; /* set the remote port ptr */ |
2180 | ||
2181 | /* | |
2182 | * flush outstanding commands | |
2183 | */ | |
3a3b42bf | 2184 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2185 | fsp->state = FC_SRB_FREE; |
2186 | fc_fcp_pkt_release(fsp); | |
2187 | ||
2188 | out: | |
2189 | return rc; | |
2190 | } | |
2191 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2192 | ||
2193 | /** | |
3a3b42bf RL |
2194 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2195 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2196 | */ |
2197 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2198 | { | |
2199 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2200 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2201 | unsigned long wait_tmo; |
2202 | ||
3a3b42bf | 2203 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2204 | |
31c0a631 | 2205 | fc_lport_reset(lport); |
42e9a92f | 2206 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2207 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2208 | wait_tmo)) | |
42e9a92f RL |
2209 | msleep(1000); |
2210 | ||
3a3b42bf | 2211 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2212 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
7b2787ec | 2213 | "on port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2214 | return SUCCESS; |
2215 | } else { | |
7414705e | 2216 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2217 | "port (%6.6x) is not ready.\n", |
7b2787ec | 2218 | lport->port_id); |
42e9a92f RL |
2219 | return FAILED; |
2220 | } | |
2221 | } | |
2222 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2223 | ||
2224 | /** | |
3a3b42bf RL |
2225 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2226 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2227 | * |
2228 | * Configures queue depth based on host's cmd_per_len. If not set | |
2229 | * then we use the libfc default. | |
2230 | */ | |
2231 | int fc_slave_alloc(struct scsi_device *sdev) | |
2232 | { | |
2233 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2234 | |
2235 | if (!rport || fc_remote_port_chkready(rport)) | |
2236 | return -ENXIO; | |
2237 | ||
db5ed4df | 2238 | scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH); |
42e9a92f RL |
2239 | return 0; |
2240 | } | |
2241 | EXPORT_SYMBOL(fc_slave_alloc); | |
2242 | ||
3a3b42bf | 2243 | /** |
775b4d65 | 2244 | * fc_fcp_destroy() - Tear down the FCP layer for a given local port |
3a3b42bf RL |
2245 | * @lport: The local port that no longer needs the FCP layer |
2246 | */ | |
2247 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2248 | { |
3a3b42bf | 2249 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2250 | |
2251 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2252 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
7b2787ec | 2253 | "port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2254 | |
2255 | mempool_destroy(si->scsi_pkt_pool); | |
2256 | kfree(si); | |
3a3b42bf | 2257 | lport->scsi_priv = NULL; |
42e9a92f RL |
2258 | } |
2259 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2260 | ||
55204909 | 2261 | int fc_setup_fcp(void) |
93e6d5ab RL |
2262 | { |
2263 | int rc = 0; | |
2264 | ||
2265 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2266 | sizeof(struct fc_fcp_pkt), | |
2267 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2268 | if (!scsi_pkt_cachep) { | |
2269 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2270 | "module load failed!"); | |
2271 | rc = -ENOMEM; | |
2272 | } | |
2273 | ||
2274 | return rc; | |
2275 | } | |
2276 | ||
55204909 | 2277 | void fc_destroy_fcp(void) |
93e6d5ab | 2278 | { |
b6876a84 | 2279 | kmem_cache_destroy(scsi_pkt_cachep); |
93e6d5ab RL |
2280 | } |
2281 | ||
3a3b42bf RL |
2282 | /** |
2283 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2284 | * @lport: The local port to initialize the exchange layer for | |
2285 | */ | |
2286 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2287 | { |
2288 | int rc; | |
2289 | struct fc_fcp_internal *si; | |
2290 | ||
3a3b42bf RL |
2291 | if (!lport->tt.fcp_cmd_send) |
2292 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2293 | |
3a3b42bf RL |
2294 | if (!lport->tt.fcp_cleanup) |
2295 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2296 | |
3a3b42bf RL |
2297 | if (!lport->tt.fcp_abort_io) |
2298 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2299 | |
2300 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2301 | if (!si) | |
2302 | return -ENOMEM; | |
3a3b42bf | 2303 | lport->scsi_priv = si; |
84c3e1ad | 2304 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2305 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2306 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2307 | |
2308 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2309 | if (!si->scsi_pkt_pool) { | |
2310 | rc = -ENOMEM; | |
2311 | goto free_internal; | |
2312 | } | |
2313 | return 0; | |
2314 | ||
2315 | free_internal: | |
2316 | kfree(si); | |
2317 | return rc; | |
2318 | } | |
2319 | EXPORT_SYMBOL(fc_fcp_init); |