Commit | Line | Data |
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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> | |
29 | #include <scsi/fc_encode.h> | |
30 | ||
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 | ||
48 | /* | |
8b7ac2bb | 49 | * The SCp.ptr should be tested and set under the scsi_pkt_queue lock |
42e9a92f RL |
50 | */ |
51 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) | |
52 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) | |
53 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) | |
54 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) | |
55 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) | |
56 | ||
3a3b42bf RL |
57 | /** |
58 | * struct fc_fcp_internal - FCP layer internal data | |
c1ecb90a CL |
59 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
60 | * @scsi_queue_lock: Protects the scsi_pkt_queue | |
3a3b42bf | 61 | * @scsi_pkt_queue: Current FCP packets |
84c3e1ad VD |
62 | * @last_can_queue_ramp_down_time: ramp down time |
63 | * @last_can_queue_ramp_up_time: ramp up time | |
64 | * @max_can_queue: max can_queue size | |
3a3b42bf | 65 | */ |
42e9a92f | 66 | struct fc_fcp_internal { |
c1ecb90a CL |
67 | mempool_t *scsi_pkt_pool; |
68 | spinlock_t scsi_queue_lock; | |
69 | struct list_head scsi_pkt_queue; | |
70 | unsigned long last_can_queue_ramp_down_time; | |
71 | unsigned long last_can_queue_ramp_up_time; | |
72 | int max_can_queue; | |
42e9a92f RL |
73 | }; |
74 | ||
75 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
76 | ||
77 | /* | |
78 | * function prototypes | |
79 | * FC scsi I/O related functions | |
80 | */ | |
81 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
82 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
83 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
84 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
85 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 86 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
ac17ea8d | 87 | static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); |
1f0849da | 88 | static void fc_fcp_timeout(struct timer_list *); |
42e9a92f RL |
89 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
90 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
91 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
92 | static void fc_io_compl(struct fc_fcp_pkt *); | |
93 | ||
94 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
95 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
96 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
97 | ||
98 | /* | |
99 | * command status codes | |
100 | */ | |
101 | #define FC_COMPLETE 0 | |
102 | #define FC_CMD_ABORTED 1 | |
103 | #define FC_CMD_RESET 2 | |
104 | #define FC_CMD_PLOGO 3 | |
105 | #define FC_SNS_RCV 4 | |
106 | #define FC_TRANS_ERR 5 | |
107 | #define FC_DATA_OVRRUN 6 | |
108 | #define FC_DATA_UNDRUN 7 | |
109 | #define FC_ERROR 8 | |
110 | #define FC_HRD_ERROR 9 | |
ac17ea8d | 111 | #define FC_CRC_ERROR 10 |
112 | #define FC_TIMED_OUT 11 | |
a0452bb4 | 113 | #define FC_TRANS_RESET 12 |
42e9a92f RL |
114 | |
115 | /* | |
116 | * Error recovery timeout values. | |
117 | */ | |
42e9a92f | 118 | #define FC_SCSI_TM_TOV (10 * HZ) |
42e9a92f | 119 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
84c3e1ad | 120 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
42e9a92f RL |
121 | |
122 | #define FC_MAX_ERROR_CNT 5 | |
123 | #define FC_MAX_RECOV_RETRY 3 | |
124 | ||
125 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
126 | ||
127 | /** | |
3a3b42bf RL |
128 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
129 | * @lport: The local port that the FCP packet is for | |
130 | * @gfp: GFP flags for allocation | |
42e9a92f | 131 | * |
3a3b42bf RL |
132 | * Return value: fcp_pkt structure or null on allocation failure. |
133 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 134 | */ |
3a3b42bf | 135 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 136 | { |
3a3b42bf | 137 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
138 | struct fc_fcp_pkt *fsp; |
139 | ||
140 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
141 | if (fsp) { | |
142 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 143 | fsp->lp = lport; |
f56635a8 | 144 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
22c70d1a | 145 | refcount_set(&fsp->ref_cnt, 1); |
1f0849da | 146 | timer_setup(&fsp->timer, NULL, 0); |
42e9a92f RL |
147 | INIT_LIST_HEAD(&fsp->list); |
148 | spin_lock_init(&fsp->scsi_pkt_lock); | |
0f02a665 VD |
149 | } else { |
150 | per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++; | |
151 | put_cpu(); | |
42e9a92f RL |
152 | } |
153 | return fsp; | |
154 | } | |
155 | ||
156 | /** | |
3a3b42bf RL |
157 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
158 | * @fsp: The FCP packet to be released | |
42e9a92f | 159 | * |
3a3b42bf RL |
160 | * Context: Can be called from process or interrupt context, |
161 | * no lock is required. | |
42e9a92f RL |
162 | */ |
163 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
164 | { | |
22c70d1a | 165 | if (refcount_dec_and_test(&fsp->ref_cnt)) { |
42e9a92f RL |
166 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); |
167 | ||
168 | mempool_free(fsp, si->scsi_pkt_pool); | |
169 | } | |
170 | } | |
171 | ||
3a3b42bf RL |
172 | /** |
173 | * fc_fcp_pkt_hold() - Hold a fcp_pkt | |
174 | * @fsp: The FCP packet to be held | |
175 | */ | |
42e9a92f RL |
176 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
177 | { | |
22c70d1a | 178 | refcount_inc(&fsp->ref_cnt); |
42e9a92f RL |
179 | } |
180 | ||
181 | /** | |
ce83a4ca | 182 | * fc_fcp_pkt_destroy() - Release hold on a fcp_pkt |
3a3b42bf RL |
183 | * @seq: The sequence that the FCP packet is on (required by destructor API) |
184 | * @fsp: The FCP packet to be released | |
185 | * | |
3afd2d15 | 186 | * This routine is called by a destructor callback in the fc_exch_seq_send() |
3a3b42bf RL |
187 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required |
188 | * argument even though it is not used by this routine. | |
42e9a92f | 189 | * |
3a3b42bf | 190 | * Context: No locking required. |
42e9a92f RL |
191 | */ |
192 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
193 | { | |
194 | fc_fcp_pkt_release(fsp); | |
195 | } | |
196 | ||
197 | /** | |
3a3b42bf RL |
198 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
199 | * @fsp: The FCP packet to be locked and incremented | |
42e9a92f | 200 | * |
3a3b42bf | 201 | * We should only return error if we return a command to SCSI-ml before |
42e9a92f RL |
202 | * getting a response. This can happen in cases where we send a abort, but |
203 | * do not wait for the response and the abort and command can be passing | |
204 | * each other on the wire/network-layer. | |
205 | * | |
206 | * Note: this function locks the packet and gets a reference to allow | |
207 | * callers to call the completion function while the lock is held and | |
208 | * not have to worry about the packets refcount. | |
209 | * | |
210 | * TODO: Maybe we should just have callers grab/release the lock and | |
211 | * have a function that they call to verify the fsp and grab a ref if | |
212 | * needed. | |
213 | */ | |
214 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
215 | { | |
216 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
217 | if (fsp->state & FC_SRB_COMPL) { | |
218 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
219 | return -EPERM; | |
220 | } | |
221 | ||
222 | fc_fcp_pkt_hold(fsp); | |
223 | return 0; | |
224 | } | |
225 | ||
3a3b42bf RL |
226 | /** |
227 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its | |
228 | * reference count | |
229 | * @fsp: The FCP packet to be unlocked and decremented | |
230 | */ | |
42e9a92f RL |
231 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
232 | { | |
233 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
234 | fc_fcp_pkt_release(fsp); | |
235 | } | |
236 | ||
3a3b42bf RL |
237 | /** |
238 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt | |
239 | * @fsp: The FCP packet to start a timer for | |
f2817ec2 | 240 | * @delay: The timeout period in jiffies |
3a3b42bf | 241 | */ |
42e9a92f RL |
242 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
243 | { | |
ad3120cf | 244 | if (!(fsp->state & FC_SRB_COMPL)) { |
42e9a92f | 245 | mod_timer(&fsp->timer, jiffies + delay); |
ad3120cf HR |
246 | fsp->timer_delay = delay; |
247 | } | |
42e9a92f RL |
248 | } |
249 | ||
d11b44ef HR |
250 | static void fc_fcp_abort_done(struct fc_fcp_pkt *fsp) |
251 | { | |
252 | fsp->state |= FC_SRB_ABORTED; | |
253 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
254 | ||
255 | if (fsp->wait_for_comp) | |
256 | complete(&fsp->tm_done); | |
257 | else | |
258 | fc_fcp_complete_locked(fsp); | |
259 | } | |
260 | ||
3a3b42bf RL |
261 | /** |
262 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a | |
263 | * fcp_pkt | |
264 | * @fsp: The FCP packet to abort exchanges on | |
265 | */ | |
42e9a92f RL |
266 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
267 | { | |
d11b44ef HR |
268 | int rc; |
269 | ||
42e9a92f RL |
270 | if (!fsp->seq_ptr) |
271 | return -EINVAL; | |
272 | ||
0f02a665 VD |
273 | per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++; |
274 | put_cpu(); | |
275 | ||
42e9a92f | 276 | fsp->state |= FC_SRB_ABORT_PENDING; |
0ebaed17 | 277 | rc = fc_seq_exch_abort(fsp->seq_ptr, 0); |
d11b44ef | 278 | /* |
0ebaed17 | 279 | * fc_seq_exch_abort() might return -ENXIO if |
d11b44ef HR |
280 | * the sequence is already completed |
281 | */ | |
282 | if (rc == -ENXIO) { | |
283 | fc_fcp_abort_done(fsp); | |
284 | rc = 0; | |
285 | } | |
286 | return rc; | |
42e9a92f RL |
287 | } |
288 | ||
3a3b42bf RL |
289 | /** |
290 | * fc_fcp_retry_cmd() - Retry a fcp_pkt | |
291 | * @fsp: The FCP packet to be retried | |
ebb40ab6 | 292 | * @status_code: The FCP status code to set |
3a3b42bf RL |
293 | * |
294 | * Sets the status code to be FC_ERROR and then calls | |
295 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). | |
296 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. | |
297 | * The SCSI-ml will retry the command. | |
42e9a92f | 298 | */ |
a0452bb4 | 299 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp, int status_code) |
42e9a92f RL |
300 | { |
301 | if (fsp->seq_ptr) { | |
768c72cc | 302 | fc_exch_done(fsp->seq_ptr); |
42e9a92f RL |
303 | fsp->seq_ptr = NULL; |
304 | } | |
305 | ||
306 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 307 | fsp->io_status = 0; |
a0452bb4 | 308 | fsp->status_code = status_code; |
42e9a92f RL |
309 | fc_fcp_complete_locked(fsp); |
310 | } | |
311 | ||
3a3b42bf RL |
312 | /** |
313 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context | |
314 | * @fsp: The FCP packet that will manage the DDP frames | |
315 | * @xid: The XID that will be used for the DDP exchange | |
b277d2aa YZ |
316 | */ |
317 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
318 | { | |
3a3b42bf | 319 | struct fc_lport *lport; |
b277d2aa | 320 | |
3a3b42bf | 321 | lport = fsp->lp; |
b277d2aa | 322 | if ((fsp->req_flags & FC_SRB_READ) && |
3a3b42bf RL |
323 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
324 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), | |
325 | scsi_sg_count(fsp->cmd))) | |
b277d2aa YZ |
326 | fsp->xfer_ddp = xid; |
327 | } | |
328 | } | |
b277d2aa | 329 | |
3a3b42bf RL |
330 | /** |
331 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any | |
332 | * DDP related resources for a fcp_pkt | |
333 | * @fsp: The FCP packet that DDP had been used on | |
b277d2aa | 334 | */ |
6a716a85 | 335 | void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) |
b277d2aa | 336 | { |
3a3b42bf | 337 | struct fc_lport *lport; |
b277d2aa YZ |
338 | |
339 | if (!fsp) | |
340 | return; | |
341 | ||
5e472d07 YZ |
342 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
343 | return; | |
344 | ||
3a3b42bf RL |
345 | lport = fsp->lp; |
346 | if (lport->tt.ddp_done) { | |
347 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); | |
5e472d07 | 348 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
349 | } |
350 | } | |
351 | ||
84c3e1ad VD |
352 | /** |
353 | * fc_fcp_can_queue_ramp_up() - increases can_queue | |
354 | * @lport: lport to ramp up can_queue | |
84c3e1ad VD |
355 | */ |
356 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) | |
357 | { | |
358 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
9c8cce8e | 359 | unsigned long flags; |
84c3e1ad VD |
360 | int can_queue; |
361 | ||
9c8cce8e RL |
362 | spin_lock_irqsave(lport->host->host_lock, flags); |
363 | ||
84c3e1ad VD |
364 | if (si->last_can_queue_ramp_up_time && |
365 | (time_before(jiffies, si->last_can_queue_ramp_up_time + | |
366 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 367 | goto unlock; |
84c3e1ad VD |
368 | |
369 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
370 | FC_CAN_QUEUE_PERIOD)) | |
9c8cce8e | 371 | goto unlock; |
84c3e1ad VD |
372 | |
373 | si->last_can_queue_ramp_up_time = jiffies; | |
374 | ||
375 | can_queue = lport->host->can_queue << 1; | |
376 | if (can_queue >= si->max_can_queue) { | |
377 | can_queue = si->max_can_queue; | |
378 | si->last_can_queue_ramp_down_time = 0; | |
379 | } | |
380 | lport->host->can_queue = can_queue; | |
381 | shost_printk(KERN_ERR, lport->host, "libfc: increased " | |
382 | "can_queue to %d.\n", can_queue); | |
9c8cce8e RL |
383 | |
384 | unlock: | |
385 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
84c3e1ad VD |
386 | } |
387 | ||
c46be11a VD |
388 | /** |
389 | * fc_fcp_can_queue_ramp_down() - reduces can_queue | |
390 | * @lport: lport to reduce can_queue | |
391 | * | |
392 | * If we are getting memory allocation failures, then we may | |
393 | * be trying to execute too many commands. We let the running | |
394 | * commands complete or timeout, then try again with a reduced | |
395 | * can_queue. Eventually we will hit the point where we run | |
396 | * on all reserved structs. | |
397 | */ | |
c1061255 | 398 | static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport) |
c46be11a VD |
399 | { |
400 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
9c8cce8e | 401 | unsigned long flags; |
c46be11a | 402 | int can_queue; |
c1061255 | 403 | bool changed = false; |
c46be11a | 404 | |
9c8cce8e RL |
405 | spin_lock_irqsave(lport->host->host_lock, flags); |
406 | ||
84c3e1ad VD |
407 | if (si->last_can_queue_ramp_down_time && |
408 | (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
409 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 410 | goto unlock; |
84c3e1ad VD |
411 | |
412 | si->last_can_queue_ramp_down_time = jiffies; | |
c46be11a VD |
413 | |
414 | can_queue = lport->host->can_queue; | |
415 | can_queue >>= 1; | |
416 | if (!can_queue) | |
417 | can_queue = 1; | |
418 | lport->host->can_queue = can_queue; | |
c1061255 | 419 | changed = true; |
9c8cce8e RL |
420 | |
421 | unlock: | |
422 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
c1061255 | 423 | return changed; |
c46be11a VD |
424 | } |
425 | ||
426 | /* | |
427 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. | |
428 | * @lport: fc lport struct | |
429 | * @len: payload length | |
430 | * | |
431 | * Allocates fc_frame structure and buffer but if fails to allocate | |
432 | * then reduce can_queue. | |
433 | */ | |
434 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, | |
435 | size_t len) | |
436 | { | |
437 | struct fc_frame *fp; | |
438 | ||
439 | fp = fc_frame_alloc(lport, len); | |
c1ecb90a CL |
440 | if (likely(fp)) |
441 | return fp; | |
442 | ||
0f02a665 VD |
443 | per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++; |
444 | put_cpu(); | |
c1ecb90a | 445 | /* error case */ |
c1ecb90a | 446 | fc_fcp_can_queue_ramp_down(lport); |
5d339d16 HR |
447 | shost_printk(KERN_ERR, lport->host, |
448 | "libfc: Could not allocate frame, " | |
449 | "reducing can_queue to %d.\n", lport->host->can_queue); | |
c1ecb90a | 450 | return NULL; |
c46be11a VD |
451 | } |
452 | ||
87da3b83 HR |
453 | /** |
454 | * get_fsp_rec_tov() - Helper function to get REC_TOV | |
455 | * @fsp: the FCP packet | |
456 | * | |
457 | * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second | |
458 | */ | |
459 | static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) | |
460 | { | |
461 | struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; | |
462 | unsigned int e_d_tov = FC_DEF_E_D_TOV; | |
463 | ||
464 | if (rpriv && rpriv->e_d_tov > e_d_tov) | |
465 | e_d_tov = rpriv->e_d_tov; | |
466 | return msecs_to_jiffies(e_d_tov) + HZ; | |
467 | } | |
468 | ||
3a3b42bf RL |
469 | /** |
470 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
471 | * @fsp: The FCP packet the data is on | |
472 | * @fp: The data frame | |
42e9a92f RL |
473 | */ |
474 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
475 | { | |
476 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 477 | struct fc_lport *lport = fsp->lp; |
1bd49b48 | 478 | struct fc_stats *stats; |
42e9a92f RL |
479 | struct fc_frame_header *fh; |
480 | size_t start_offset; | |
481 | size_t offset; | |
482 | u32 crc; | |
483 | u32 copy_len = 0; | |
484 | size_t len; | |
485 | void *buf; | |
486 | struct scatterlist *sg; | |
58682874 | 487 | u32 nents; |
ac17ea8d | 488 | u8 host_bcode = FC_COMPLETE; |
42e9a92f RL |
489 | |
490 | fh = fc_frame_header_get(fp); | |
491 | offset = ntohl(fh->fh_parm_offset); | |
492 | start_offset = offset; | |
493 | len = fr_len(fp) - sizeof(*fh); | |
494 | buf = fc_frame_payload_get(fp, 0); | |
495 | ||
5c12c418 | 496 | /* |
ac17ea8d | 497 | * if this I/O is ddped then clear it and initiate recovery since data |
498 | * frames are expected to be placed directly in that case. | |
499 | * | |
500 | * Indicate error to scsi-ml because something went wrong with the | |
501 | * ddp handling to get us here. | |
5c12c418 VD |
502 | */ |
503 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { | |
504 | fc_fcp_ddp_done(fsp); | |
ac17ea8d | 505 | FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); |
506 | host_bcode = FC_ERROR; | |
5c12c418 VD |
507 | goto err; |
508 | } | |
42e9a92f | 509 | if (offset + len > fsp->data_len) { |
34f42a07 | 510 | /* this should never happen */ |
42e9a92f RL |
511 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
512 | fc_frame_crc_check(fp)) | |
513 | goto crc_err; | |
7414705e RL |
514 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
515 | "data_len %x\n", len, offset, fsp->data_len); | |
ac17ea8d | 516 | |
517 | /* Data is corrupted indicate scsi-ml should retry */ | |
518 | host_bcode = FC_DATA_OVRRUN; | |
5c12c418 | 519 | goto err; |
42e9a92f RL |
520 | } |
521 | if (offset != fsp->xfer_len) | |
522 | fsp->state |= FC_SRB_DISCONTIG; | |
523 | ||
42e9a92f | 524 | sg = scsi_sglist(sc); |
58682874 | 525 | nents = scsi_sg_count(sc); |
42e9a92f | 526 | |
58682874 RL |
527 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
528 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 529 | &offset, NULL); |
58682874 RL |
530 | } else { |
531 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
532 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 533 | &offset, &crc); |
42e9a92f | 534 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 535 | if (len % 4) |
42e9a92f | 536 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
537 | |
538 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
539 | crc_err: | |
1bd49b48 | 540 | stats = per_cpu_ptr(lport->stats, get_cpu()); |
42e9a92f | 541 | stats->ErrorFrames++; |
f018b73a | 542 | /* per cpu count, not total count, but OK for limit */ |
688fd364 | 543 | if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) |
7414705e | 544 | printk(KERN_WARNING "libfc: CRC error on data " |
ce8b5df0 | 545 | "frame for port (%6.6x)\n", |
7b2787ec | 546 | lport->port_id); |
f018b73a | 547 | put_cpu(); |
42e9a92f RL |
548 | /* |
549 | * Assume the frame is total garbage. | |
550 | * We may have copied it over the good part | |
551 | * of the buffer. | |
552 | * If so, we need to retry the entire operation. | |
553 | * Otherwise, ignore it. | |
554 | */ | |
ac17ea8d | 555 | if (fsp->state & FC_SRB_DISCONTIG) { |
556 | host_bcode = FC_CRC_ERROR; | |
5c12c418 | 557 | goto err; |
ac17ea8d | 558 | } |
42e9a92f RL |
559 | return; |
560 | } | |
561 | } | |
562 | ||
563 | if (fsp->xfer_contig_end == start_offset) | |
564 | fsp->xfer_contig_end += copy_len; | |
565 | fsp->xfer_len += copy_len; | |
566 | ||
567 | /* | |
568 | * In the very rare event that this data arrived after the response | |
569 | * and completes the transfer, call the completion handler. | |
570 | */ | |
571 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
87da3b83 HR |
572 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) { |
573 | FC_FCP_DBG( fsp, "complete out-of-order sequence\n" ); | |
42e9a92f | 574 | fc_fcp_complete_locked(fsp); |
87da3b83 | 575 | } |
5c12c418 VD |
576 | return; |
577 | err: | |
ac17ea8d | 578 | fc_fcp_recovery(fsp, host_bcode); |
42e9a92f RL |
579 | } |
580 | ||
34f42a07 | 581 | /** |
3a3b42bf RL |
582 | * fc_fcp_send_data() - Send SCSI data to a target |
583 | * @fsp: The FCP packet the data is on | |
ebb40ab6 | 584 | * @seq: The sequence the data is to be sent on |
3a3b42bf RL |
585 | * @offset: The starting offset for this data request |
586 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
587 | * |
588 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf | 589 | * If the LLD is capable of sequence offload then send down the |
9ddc5b6f | 590 | * seq_blen amount of data in single frame, otherwise send |
3a3b42bf RL |
591 | * multiple frames of the maximum frame payload supported by |
592 | * the target port. | |
42e9a92f RL |
593 | */ |
594 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
595 | size_t offset, size_t seq_blen) | |
596 | { | |
597 | struct fc_exch *ep; | |
598 | struct scsi_cmnd *sc; | |
599 | struct scatterlist *sg; | |
600 | struct fc_frame *fp = NULL; | |
3a3b42bf | 601 | struct fc_lport *lport = fsp->lp; |
18fa11ef | 602 | struct page *page; |
42e9a92f RL |
603 | size_t remaining; |
604 | size_t t_blen; | |
605 | size_t tlen; | |
606 | size_t sg_bytes; | |
607 | size_t frame_offset, fh_parm_offset; | |
18fa11ef | 608 | size_t off; |
42e9a92f RL |
609 | int error; |
610 | void *data = NULL; | |
611 | void *page_addr; | |
3a3b42bf | 612 | int using_sg = lport->sg_supp; |
42e9a92f RL |
613 | u32 f_ctl; |
614 | ||
615 | WARN_ON(seq_blen <= 0); | |
616 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
617 | /* this should never happen */ | |
7414705e RL |
618 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
619 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
620 | fc_fcp_send_abort(fsp); |
621 | return 0; | |
622 | } else if (offset != fsp->xfer_len) { | |
623 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
624 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
625 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
626 | } |
627 | ||
628 | /* | |
629 | * if LLD is capable of seq_offload then set transport | |
630 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
631 | * to max FC frame payload previously set in fsp->max_payload. | |
632 | */ | |
276d6814 | 633 | t_blen = fsp->max_payload; |
3a3b42bf RL |
634 | if (lport->seq_offload) { |
635 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 636 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 637 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
638 | } |
639 | ||
42e9a92f RL |
640 | if (t_blen > 512) |
641 | t_blen &= ~(512 - 1); /* round down to block size */ | |
42e9a92f RL |
642 | sc = fsp->cmd; |
643 | ||
644 | remaining = seq_blen; | |
645 | fh_parm_offset = frame_offset = offset; | |
646 | tlen = 0; | |
c6865b30 | 647 | seq = fc_seq_start_next(seq); |
42e9a92f RL |
648 | f_ctl = FC_FC_REL_OFF; |
649 | WARN_ON(!seq); | |
650 | ||
42e9a92f RL |
651 | sg = scsi_sglist(sc); |
652 | ||
653 | while (remaining > 0 && sg) { | |
654 | if (offset >= sg->length) { | |
655 | offset -= sg->length; | |
656 | sg = sg_next(sg); | |
657 | continue; | |
658 | } | |
659 | if (!fp) { | |
660 | tlen = min(t_blen, remaining); | |
661 | ||
662 | /* | |
663 | * TODO. Temporary workaround. fc_seq_send() can't | |
664 | * handle odd lengths in non-linear skbs. | |
665 | * This will be the final fragment only. | |
666 | */ | |
667 | if (tlen % 4) | |
668 | using_sg = 0; | |
a7bbc7f4 VD |
669 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
670 | if (!fp) | |
671 | return -ENOMEM; | |
672 | ||
673 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
674 | fh_parm_offset = frame_offset; |
675 | fr_max_payload(fp) = fsp->max_payload; | |
676 | } | |
18fa11ef CL |
677 | |
678 | off = offset + sg->offset; | |
42e9a92f | 679 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
680 | sg_bytes = min(sg_bytes, |
681 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
682 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 683 | if (using_sg) { |
18fa11ef | 684 | get_page(page); |
42e9a92f RL |
685 | skb_fill_page_desc(fp_skb(fp), |
686 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 687 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
688 | fp_skb(fp)->data_len += sg_bytes; |
689 | fr_len(fp) += sg_bytes; | |
690 | fp_skb(fp)->truesize += PAGE_SIZE; | |
691 | } else { | |
42e9a92f RL |
692 | /* |
693 | * The scatterlist item may be bigger than PAGE_SIZE, | |
694 | * but we must not cross pages inside the kmap. | |
695 | */ | |
77dfce07 | 696 | page_addr = kmap_atomic(page); |
42e9a92f RL |
697 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
698 | sg_bytes); | |
77dfce07 | 699 | kunmap_atomic(page_addr); |
42e9a92f RL |
700 | data += sg_bytes; |
701 | } | |
702 | offset += sg_bytes; | |
703 | frame_offset += sg_bytes; | |
704 | tlen -= sg_bytes; | |
705 | remaining -= sg_bytes; | |
706 | ||
d37322a4 YZ |
707 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
708 | (tlen)) | |
42e9a92f RL |
709 | continue; |
710 | ||
711 | /* | |
712 | * Send sequence with transfer sequence initiative in case | |
713 | * this is last FCP frame of the sequence. | |
714 | */ | |
715 | if (remaining == 0) | |
716 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
717 | ||
718 | ep = fc_seq_exch(seq); | |
719 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
720 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
721 | ||
722 | /* | |
723 | * send fragment using for a sequence. | |
724 | */ | |
0cac937d | 725 | error = fc_seq_send(lport, seq, fp); |
42e9a92f RL |
726 | if (error) { |
727 | WARN_ON(1); /* send error should be rare */ | |
8467b96c | 728 | return error; |
42e9a92f RL |
729 | } |
730 | fp = NULL; | |
731 | } | |
732 | fsp->xfer_len += seq_blen; /* premature count? */ | |
733 | return 0; | |
734 | } | |
735 | ||
3a3b42bf | 736 | /** |
547fb12b | 737 | * fc_fcp_abts_resp() - Receive an ABTS response |
3a3b42bf RL |
738 | * @fsp: The FCP packet that is being aborted |
739 | * @fp: The response frame | |
740 | */ | |
42e9a92f RL |
741 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
742 | { | |
743 | int ba_done = 1; | |
744 | struct fc_ba_rjt *brp; | |
745 | struct fc_frame_header *fh; | |
746 | ||
747 | fh = fc_frame_header_get(fp); | |
748 | switch (fh->fh_r_ctl) { | |
749 | case FC_RCTL_BA_ACC: | |
750 | break; | |
751 | case FC_RCTL_BA_RJT: | |
752 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
753 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
754 | break; | |
df561f66 | 755 | fallthrough; |
42e9a92f RL |
756 | default: |
757 | /* | |
758 | * we will let the command timeout | |
759 | * and scsi-ml recover in this case, | |
760 | * therefore cleared the ba_done flag. | |
761 | */ | |
762 | ba_done = 0; | |
763 | } | |
764 | ||
d11b44ef HR |
765 | if (ba_done) |
766 | fc_fcp_abort_done(fsp); | |
42e9a92f RL |
767 | } |
768 | ||
34f42a07 | 769 | /** |
547fb12b | 770 | * fc_fcp_recv() - Receive an FCP frame |
34f42a07 | 771 | * @seq: The sequence the frame is on |
3a3b42bf | 772 | * @fp: The received frame |
34f42a07 | 773 | * @arg: The related FCP packet |
42e9a92f | 774 | * |
3a3b42bf RL |
775 | * Context: Called from Soft IRQ context. Can not be called |
776 | * holding the FCP packet list lock. | |
42e9a92f RL |
777 | */ |
778 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
779 | { | |
780 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 781 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
782 | struct fc_frame_header *fh; |
783 | struct fcp_txrdy *dd; | |
784 | u8 r_ctl; | |
785 | int rc = 0; | |
786 | ||
c46be11a VD |
787 | if (IS_ERR(fp)) { |
788 | fc_fcp_error(fsp, fp); | |
789 | return; | |
790 | } | |
42e9a92f RL |
791 | |
792 | fh = fc_frame_header_get(fp); | |
793 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 794 | |
57d3ec7e HR |
795 | if (lport->state != LPORT_ST_READY) { |
796 | FC_FCP_DBG(fsp, "lport state %d, ignoring r_ctl %x\n", | |
797 | lport->state, r_ctl); | |
42e9a92f | 798 | goto out; |
57d3ec7e | 799 | } |
42e9a92f RL |
800 | if (fc_fcp_lock_pkt(fsp)) |
801 | goto out; | |
42e9a92f RL |
802 | |
803 | if (fh->fh_type == FC_TYPE_BLS) { | |
804 | fc_fcp_abts_resp(fsp, fp); | |
805 | goto unlock; | |
806 | } | |
807 | ||
57d3ec7e HR |
808 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) { |
809 | FC_FCP_DBG(fsp, "command aborted, ignoring r_ctl %x\n", r_ctl); | |
42e9a92f | 810 | goto unlock; |
57d3ec7e | 811 | } |
42e9a92f RL |
812 | |
813 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
814 | /* | |
815 | * received XFER RDY from the target | |
816 | * need to send data to the target | |
817 | */ | |
818 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
819 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
820 | WARN_ON(!dd); | |
821 | ||
822 | rc = fc_fcp_send_data(fsp, seq, | |
823 | (size_t) ntohl(dd->ft_data_ro), | |
824 | (size_t) ntohl(dd->ft_burst_len)); | |
825 | if (!rc) | |
826 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
827 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
828 | /* | |
829 | * received a DATA frame | |
830 | * next we will copy the data to the system buffer | |
831 | */ | |
832 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
833 | fc_fcp_recv_data(fsp, fp); | |
834 | seq->rec_data = fsp->xfer_contig_end; | |
835 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
836 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
837 | ||
838 | fc_fcp_resp(fsp, fp); | |
839 | } else { | |
7414705e | 840 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
841 | } |
842 | unlock: | |
843 | fc_fcp_unlock_pkt(fsp); | |
844 | out: | |
845 | fc_frame_free(fp); | |
42e9a92f RL |
846 | } |
847 | ||
3a3b42bf RL |
848 | /** |
849 | * fc_fcp_resp() - Handler for FCP responses | |
850 | * @fsp: The FCP packet the response is for | |
851 | * @fp: The response frame | |
852 | */ | |
42e9a92f RL |
853 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
854 | { | |
855 | struct fc_frame_header *fh; | |
856 | struct fcp_resp *fc_rp; | |
857 | struct fcp_resp_ext *rp_ex; | |
858 | struct fcp_resp_rsp_info *fc_rp_info; | |
859 | u32 plen; | |
860 | u32 expected_len; | |
861 | u32 respl = 0; | |
862 | u32 snsl = 0; | |
863 | u8 flags = 0; | |
864 | ||
865 | plen = fr_len(fp); | |
866 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
867 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
868 | goto len_err; | |
869 | plen -= sizeof(*fh); | |
870 | fc_rp = (struct fcp_resp *)(fh + 1); | |
871 | fsp->cdb_status = fc_rp->fr_status; | |
872 | flags = fc_rp->fr_flags; | |
873 | fsp->scsi_comp_flags = flags; | |
874 | expected_len = fsp->data_len; | |
875 | ||
b277d2aa YZ |
876 | /* if ddp, update xfer len */ |
877 | fc_fcp_ddp_done(fsp); | |
878 | ||
42e9a92f RL |
879 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
880 | rp_ex = (void *)(fc_rp + 1); | |
881 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
882 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
883 | goto len_err; | |
884 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
885 | if (flags & FCP_RSP_LEN_VAL) { | |
886 | respl = ntohl(rp_ex->fr_rsp_len); | |
3b64b188 YZ |
887 | if ((respl != FCP_RESP_RSP_INFO_LEN4) && |
888 | (respl != FCP_RESP_RSP_INFO_LEN8)) | |
42e9a92f RL |
889 | goto len_err; |
890 | if (fsp->wait_for_comp) { | |
891 | /* Abuse cdb_status for rsp code */ | |
892 | fsp->cdb_status = fc_rp_info->rsp_code; | |
893 | complete(&fsp->tm_done); | |
894 | /* | |
895 | * tmfs will not have any scsi cmd so | |
896 | * exit here | |
897 | */ | |
898 | return; | |
63ac4bbf | 899 | } |
42e9a92f RL |
900 | } |
901 | if (flags & FCP_SNS_LEN_VAL) { | |
902 | snsl = ntohl(rp_ex->fr_sns_len); | |
903 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
904 | snsl = SCSI_SENSE_BUFFERSIZE; | |
905 | memcpy(fsp->cmd->sense_buffer, | |
906 | (char *)fc_rp_info + respl, snsl); | |
907 | } | |
908 | } | |
909 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
910 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
911 | goto len_err; | |
912 | if (flags & FCP_RESID_UNDER) { | |
913 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
914 | /* | |
915 | * The cmnd->underflow is the minimum number of | |
25985edc | 916 | * bytes that must be transferred for this |
42e9a92f RL |
917 | * command. Provided a sense condition is not |
918 | * present, make sure the actual amount | |
919 | * transferred is at least the underflow value | |
920 | * or fail. | |
921 | */ | |
922 | if (!(flags & FCP_SNS_LEN_VAL) && | |
923 | (fc_rp->fr_status == 0) && | |
924 | (scsi_bufflen(fsp->cmd) - | |
925 | fsp->scsi_resid) < fsp->cmd->underflow) | |
926 | goto err; | |
927 | expected_len -= fsp->scsi_resid; | |
928 | } else { | |
929 | fsp->status_code = FC_ERROR; | |
930 | } | |
931 | } | |
932 | } | |
933 | fsp->state |= FC_SRB_RCV_STATUS; | |
934 | ||
935 | /* | |
936 | * Check for missing or extra data frames. | |
937 | */ | |
9de99010 BVA |
938 | if (unlikely(fsp->cdb_status == SAM_STAT_GOOD && |
939 | fsp->xfer_len != expected_len)) { | |
42e9a92f RL |
940 | if (fsp->xfer_len < expected_len) { |
941 | /* | |
942 | * Some data may be queued locally, | |
943 | * Wait a at least one jiffy to see if it is delivered. | |
944 | * If this expires without data, we may do SRR. | |
945 | */ | |
ad3120cf HR |
946 | if (fsp->lp->qfull) { |
947 | FC_FCP_DBG(fsp, "tgt %6.6x queue busy retry\n", | |
948 | fsp->rport->port_id); | |
949 | return; | |
950 | } | |
57d3ec7e HR |
951 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx data underrun " |
952 | "len %x, data len %x\n", | |
953 | fsp->rport->port_id, | |
954 | fsp->xfer_len, expected_len, fsp->data_len); | |
87da3b83 | 955 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
956 | return; |
957 | } | |
958 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 959 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
960 | "len %x, data len %x\n", |
961 | fsp->rport->port_id, | |
962 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
963 | } |
964 | fc_fcp_complete_locked(fsp); | |
965 | return; | |
966 | ||
967 | len_err: | |
7414705e RL |
968 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
969 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
970 | err: |
971 | fsp->status_code = FC_ERROR; | |
972 | fc_fcp_complete_locked(fsp); | |
973 | } | |
974 | ||
975 | /** | |
3a3b42bf RL |
976 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
977 | * fcp_pkt lock held | |
978 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
979 | * |
980 | * This function may sleep if a timer is pending. The packet lock must be | |
981 | * held, and the host lock must not be held. | |
982 | */ | |
983 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
984 | { | |
3a3b42bf | 985 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
986 | struct fc_seq *seq; |
987 | struct fc_exch *ep; | |
988 | u32 f_ctl; | |
989 | ||
990 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
991 | return; | |
992 | ||
993 | if (fsp->state & FC_SRB_ABORTED) { | |
994 | if (!fsp->status_code) | |
995 | fsp->status_code = FC_CMD_ABORTED; | |
996 | } else { | |
997 | /* | |
998 | * Test for transport underrun, independent of response | |
999 | * underrun status. | |
1000 | */ | |
9de99010 BVA |
1001 | if (fsp->cdb_status == SAM_STAT_GOOD && |
1002 | fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
42e9a92f | 1003 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || |
57d3ec7e HR |
1004 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { |
1005 | FC_FCP_DBG(fsp, "data underrun, xfer %zx data %x\n", | |
1006 | fsp->xfer_len, fsp->data_len); | |
42e9a92f | 1007 | fsp->status_code = FC_DATA_UNDRUN; |
57d3ec7e | 1008 | } |
42e9a92f RL |
1009 | } |
1010 | ||
1011 | seq = fsp->seq_ptr; | |
1012 | if (seq) { | |
1013 | fsp->seq_ptr = NULL; | |
1014 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
1015 | struct fc_frame *conf_frame; | |
1016 | struct fc_seq *csp; | |
1017 | ||
c6865b30 | 1018 | csp = fc_seq_start_next(seq); |
c46be11a | 1019 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
1020 | if (conf_frame) { |
1021 | f_ctl = FC_FC_SEQ_INIT; | |
1022 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
1023 | ep = fc_seq_exch(seq); | |
1024 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
1025 | ep->did, ep->sid, | |
1026 | FC_TYPE_FCP, f_ctl, 0); | |
0cac937d | 1027 | fc_seq_send(lport, csp, conf_frame); |
42e9a92f RL |
1028 | } |
1029 | } | |
768c72cc | 1030 | fc_exch_done(seq); |
42e9a92f | 1031 | } |
d889b30a YZ |
1032 | /* |
1033 | * Some resets driven by SCSI are not I/Os and do not have | |
1034 | * SCSI commands associated with the requests. We should not | |
1035 | * call I/O completion if we do not have a SCSI command. | |
1036 | */ | |
1037 | if (fsp->cmd) | |
1038 | fc_io_compl(fsp); | |
42e9a92f RL |
1039 | } |
1040 | ||
3a3b42bf RL |
1041 | /** |
1042 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
1043 | * @fsp: The FCP packet whose exchanges should be canceled | |
1044 | * @error: The reason for the cancellation | |
1045 | */ | |
42e9a92f RL |
1046 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
1047 | { | |
42e9a92f | 1048 | if (fsp->seq_ptr) { |
768c72cc | 1049 | fc_exch_done(fsp->seq_ptr); |
42e9a92f RL |
1050 | fsp->seq_ptr = NULL; |
1051 | } | |
1052 | fsp->status_code = error; | |
1053 | } | |
1054 | ||
1055 | /** | |
3a3b42bf RL |
1056 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
1057 | * @lport: The local port whose exchanges should be canceled | |
1058 | * @id: The target's ID | |
1059 | * @lun: The LUN | |
1060 | * @error: The reason for cancellation | |
42e9a92f RL |
1061 | * |
1062 | * If lun or id is -1, they are ignored. | |
1063 | */ | |
3a3b42bf | 1064 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
1065 | unsigned int lun, int error) |
1066 | { | |
3a3b42bf | 1067 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
1068 | struct fc_fcp_pkt *fsp; |
1069 | struct scsi_cmnd *sc_cmd; | |
1070 | unsigned long flags; | |
1071 | ||
c1ecb90a | 1072 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1073 | restart: |
1074 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1075 | sc_cmd = fsp->cmd; | |
1076 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1077 | continue; | |
1078 | ||
1079 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1080 | continue; | |
1081 | ||
1082 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1083 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f | 1084 | |
8f2777f5 BVA |
1085 | spin_lock_bh(&fsp->scsi_pkt_lock); |
1086 | if (!(fsp->state & FC_SRB_COMPL)) { | |
1087 | fsp->state |= FC_SRB_COMPL; | |
1088 | /* | |
1089 | * TODO: dropping scsi_pkt_lock and then reacquiring | |
1090 | * again around fc_fcp_cleanup_cmd() is required, | |
1091 | * since fc_fcp_cleanup_cmd() calls into | |
1092 | * fc_seq_set_resp() and that func preempts cpu using | |
1093 | * schedule. May be schedule and related code should be | |
1094 | * removed instead of unlocking here to avoid scheduling | |
1095 | * while atomic bug. | |
1096 | */ | |
1097 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1098 | ||
42e9a92f | 1099 | fc_fcp_cleanup_cmd(fsp, error); |
8f2777f5 BVA |
1100 | |
1101 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
42e9a92f | 1102 | fc_io_compl(fsp); |
42e9a92f | 1103 | } |
8f2777f5 | 1104 | spin_unlock_bh(&fsp->scsi_pkt_lock); |
42e9a92f RL |
1105 | |
1106 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1107 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1108 | /* |
1109 | * while we dropped the lock multiple pkts could | |
1110 | * have been released, so we have to start over. | |
1111 | */ | |
1112 | goto restart; | |
1113 | } | |
c1ecb90a | 1114 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1115 | } |
1116 | ||
3a3b42bf RL |
1117 | /** |
1118 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1119 | * @lport: The local port whose exchanges are to be aborted | |
1120 | */ | |
1121 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1122 | { |
3a3b42bf | 1123 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1124 | } |
1125 | ||
1126 | /** | |
3a3b42bf RL |
1127 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1128 | * @lport: The local port to send the FCP packet on | |
1129 | * @fsp: The FCP packet to send | |
42e9a92f | 1130 | * |
3a3b42bf | 1131 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1132 | * Locks: Called without locks held |
42e9a92f | 1133 | */ |
3a3b42bf | 1134 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1135 | { |
3a3b42bf | 1136 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1137 | unsigned long flags; |
42e9a92f RL |
1138 | int rc; |
1139 | ||
1140 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1141 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1142 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1143 | ||
e35fa8c2 | 1144 | int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); |
42e9a92f | 1145 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); |
42e9a92f | 1146 | |
c1ecb90a CL |
1147 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1148 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1149 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1150 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1151 | if (unlikely(rc)) { |
1152 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
c9d24a76 | 1153 | fsp->cmd->SCp.ptr = NULL; |
42e9a92f | 1154 | list_del(&fsp->list); |
c1ecb90a CL |
1155 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1156 | } | |
42e9a92f RL |
1157 | |
1158 | return rc; | |
1159 | } | |
1160 | ||
3a3b42bf RL |
1161 | /** |
1162 | * fc_fcp_cmd_send() - Send a FCP command | |
1163 | * @lport: The local port to send the command on | |
1164 | * @fsp: The FCP packet the command is on | |
1165 | * @resp: The handler for the response | |
1166 | */ | |
1167 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1168 | void (*resp)(struct fc_seq *, |
1169 | struct fc_frame *fp, | |
1170 | void *arg)) | |
1171 | { | |
1172 | struct fc_frame *fp; | |
1173 | struct fc_seq *seq; | |
1174 | struct fc_rport *rport; | |
3a3b42bf | 1175 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1176 | const size_t len = sizeof(fsp->cdb_cmd); |
1177 | int rc = 0; | |
1178 | ||
1179 | if (fc_fcp_lock_pkt(fsp)) | |
1180 | return 0; | |
1181 | ||
c46be11a | 1182 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1183 | if (!fp) { |
1184 | rc = -1; | |
1185 | goto unlock; | |
1186 | } | |
1187 | ||
1188 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1189 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1190 | rport = fsp->rport; |
1191 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1192 | rpriv = rport->dd_data; |
42e9a92f RL |
1193 | |
1194 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
7b2787ec | 1195 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1196 | FC_FCTL_REQ, 0); |
42e9a92f | 1197 | |
3afd2d15 | 1198 | seq = fc_exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, fsp, 0); |
42e9a92f | 1199 | if (!seq) { |
42e9a92f RL |
1200 | rc = -1; |
1201 | goto unlock; | |
1202 | } | |
42e9a92f RL |
1203 | fsp->seq_ptr = seq; |
1204 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1205 | ||
841b86f3 | 1206 | fsp->timer.function = fc_fcp_timeout; |
05fee645 | 1207 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
f2817ec2 | 1208 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
05fee645 | 1209 | |
42e9a92f RL |
1210 | unlock: |
1211 | fc_fcp_unlock_pkt(fsp); | |
1212 | return rc; | |
1213 | } | |
1214 | ||
3a3b42bf RL |
1215 | /** |
1216 | * fc_fcp_error() - Handler for FCP layer errors | |
1217 | * @fsp: The FCP packet the error is on | |
1218 | * @fp: The frame that has errored | |
42e9a92f RL |
1219 | */ |
1220 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1221 | { | |
1222 | int error = PTR_ERR(fp); | |
1223 | ||
1224 | if (fc_fcp_lock_pkt(fsp)) | |
1225 | return; | |
1226 | ||
7414705e | 1227 | if (error == -FC_EX_CLOSED) { |
a0452bb4 | 1228 | fc_fcp_retry_cmd(fsp, FC_ERROR); |
42e9a92f | 1229 | goto unlock; |
42e9a92f | 1230 | } |
7414705e | 1231 | |
42e9a92f RL |
1232 | /* |
1233 | * clear abort pending, because the lower layer | |
1234 | * decided to force completion. | |
1235 | */ | |
1236 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1237 | fsp->status_code = FC_CMD_PLOGO; | |
1238 | fc_fcp_complete_locked(fsp); | |
1239 | unlock: | |
1240 | fc_fcp_unlock_pkt(fsp); | |
1241 | } | |
1242 | ||
3a3b42bf RL |
1243 | /** |
1244 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1245 | * @fsp: The FCP packet to abort on | |
1246 | * | |
1247 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1248 | */ |
c340111d | 1249 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1250 | { |
1251 | int rc = FAILED; | |
fa79dbdb | 1252 | unsigned long ticks_left; |
42e9a92f | 1253 | |
57d3ec7e HR |
1254 | FC_FCP_DBG(fsp, "pkt abort state %x\n", fsp->state); |
1255 | if (fc_fcp_send_abort(fsp)) { | |
1256 | FC_FCP_DBG(fsp, "failed to send abort\n"); | |
42e9a92f | 1257 | return FAILED; |
57d3ec7e | 1258 | } |
42e9a92f | 1259 | |
d11b44ef HR |
1260 | if (fsp->state & FC_SRB_ABORTED) { |
1261 | FC_FCP_DBG(fsp, "target abort cmd completed\n"); | |
1262 | return SUCCESS; | |
1263 | } | |
1264 | ||
42e9a92f RL |
1265 | init_completion(&fsp->tm_done); |
1266 | fsp->wait_for_comp = 1; | |
1267 | ||
1268 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
fa79dbdb HD |
1269 | ticks_left = wait_for_completion_timeout(&fsp->tm_done, |
1270 | FC_SCSI_TM_TOV); | |
42e9a92f RL |
1271 | spin_lock_bh(&fsp->scsi_pkt_lock); |
1272 | fsp->wait_for_comp = 0; | |
1273 | ||
fa79dbdb | 1274 | if (!ticks_left) { |
7414705e | 1275 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f | 1276 | } else if (fsp->state & FC_SRB_ABORTED) { |
7414705e | 1277 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1278 | rc = SUCCESS; |
1279 | fc_fcp_complete_locked(fsp); | |
1280 | } | |
1281 | ||
1282 | return rc; | |
1283 | } | |
1284 | ||
3a3b42bf RL |
1285 | /** |
1286 | * fc_lun_reset_send() - Send LUN reset command | |
ebb40ab6 | 1287 | * @t: Timer context used to fetch the FSP packet |
42e9a92f | 1288 | */ |
1f0849da | 1289 | static void fc_lun_reset_send(struct timer_list *t) |
42e9a92f | 1290 | { |
1f0849da | 1291 | struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); |
3a3b42bf | 1292 | struct fc_lport *lport = fsp->lp; |
e0883a3c | 1293 | |
3a3b42bf | 1294 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { |
42e9a92f RL |
1295 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1296 | return; | |
1297 | if (fc_fcp_lock_pkt(fsp)) | |
1298 | return; | |
841b86f3 | 1299 | fsp->timer.function = fc_lun_reset_send; |
f2817ec2 | 1300 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1301 | fc_fcp_unlock_pkt(fsp); |
1302 | } | |
1303 | } | |
1304 | ||
3a3b42bf RL |
1305 | /** |
1306 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1307 | * and wait for the reply | |
b595076a | 1308 | * @lport: The local port to sent the command on |
3a3b42bf RL |
1309 | * @fsp: The FCP packet that identifies the LUN to be reset |
1310 | * @id: The SCSI command ID | |
1311 | * @lun: The LUN ID to be reset | |
42e9a92f | 1312 | */ |
3a3b42bf | 1313 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1314 | unsigned int id, unsigned int lun) |
1315 | { | |
1316 | int rc; | |
1317 | ||
1318 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1319 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
e35fa8c2 | 1320 | int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); |
42e9a92f RL |
1321 | |
1322 | fsp->wait_for_comp = 1; | |
1323 | init_completion(&fsp->tm_done); | |
1324 | ||
1f0849da | 1325 | fc_lun_reset_send(&fsp->timer); |
42e9a92f RL |
1326 | |
1327 | /* | |
1328 | * wait for completion of reset | |
1329 | * after that make sure all commands are terminated | |
1330 | */ | |
1331 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1332 | ||
1333 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1334 | fsp->state |= FC_SRB_COMPL; | |
1335 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1336 | ||
1337 | del_timer_sync(&fsp->timer); | |
1338 | ||
1339 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1340 | if (fsp->seq_ptr) { | |
768c72cc | 1341 | fc_exch_done(fsp->seq_ptr); |
42e9a92f RL |
1342 | fsp->seq_ptr = NULL; |
1343 | } | |
1344 | fsp->wait_for_comp = 0; | |
1345 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1346 | ||
1347 | if (!rc) { | |
3a3b42bf | 1348 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1349 | return FAILED; |
1350 | } | |
1351 | ||
1352 | /* cdb_status holds the tmf's rsp code */ | |
1353 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1354 | return FAILED; | |
1355 | ||
3a3b42bf RL |
1356 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1357 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1358 | return SUCCESS; |
1359 | } | |
1360 | ||
3a3b42bf | 1361 | /** |
25985edc | 1362 | * fc_tm_done() - Task Management response handler |
3a3b42bf RL |
1363 | * @seq: The sequence that the response is on |
1364 | * @fp: The response frame | |
1365 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1366 | */ |
1367 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1368 | { | |
1369 | struct fc_fcp_pkt *fsp = arg; | |
1370 | struct fc_frame_header *fh; | |
1371 | ||
1372 | if (IS_ERR(fp)) { | |
1373 | /* | |
1374 | * If there is an error just let it timeout or wait | |
1375 | * for TMF to be aborted if it timedout. | |
1376 | * | |
1377 | * scsi-eh will escalate for when either happens. | |
1378 | */ | |
e4a9a982 | 1379 | return; |
42e9a92f RL |
1380 | } |
1381 | ||
1382 | if (fc_fcp_lock_pkt(fsp)) | |
b5fe5e95 | 1383 | goto out; |
42e9a92f RL |
1384 | |
1385 | /* | |
1386 | * raced with eh timeout handler. | |
1387 | */ | |
b5fe5e95 YZ |
1388 | if (!fsp->seq_ptr || !fsp->wait_for_comp) |
1389 | goto out_unlock; | |
42e9a92f RL |
1390 | |
1391 | fh = fc_frame_header_get(fp); | |
1392 | if (fh->fh_type != FC_TYPE_BLS) | |
1393 | fc_fcp_resp(fsp, fp); | |
1394 | fsp->seq_ptr = NULL; | |
768c72cc | 1395 | fc_exch_done(seq); |
b5fe5e95 | 1396 | out_unlock: |
42e9a92f | 1397 | fc_fcp_unlock_pkt(fsp); |
b5fe5e95 YZ |
1398 | out: |
1399 | fc_frame_free(fp); | |
42e9a92f RL |
1400 | } |
1401 | ||
3a3b42bf RL |
1402 | /** |
1403 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1404 | * @lport: The local port to be cleaned up | |
1405 | */ | |
1406 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1407 | { |
3a3b42bf | 1408 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1409 | } |
1410 | ||
3a3b42bf RL |
1411 | /** |
1412 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
ebb40ab6 | 1413 | * @t: Timer context used to fetch the FSP packet |
42e9a92f | 1414 | * |
3a3b42bf RL |
1415 | * If REC is supported then just issue it and return. The REC exchange will |
1416 | * complete or time out and recovery can continue at that point. Otherwise, | |
1417 | * if the response has been received without all the data it has been | |
1418 | * ER_TIMEOUT since the response was received. If the response has not been | |
1419 | * received we see if data was received recently. If it has been then we | |
1420 | * continue waiting, otherwise, we abort the command. | |
42e9a92f | 1421 | */ |
1f0849da | 1422 | static void fc_fcp_timeout(struct timer_list *t) |
42e9a92f | 1423 | { |
1f0849da | 1424 | struct fc_fcp_pkt *fsp = from_timer(fsp, t, timer); |
42e9a92f | 1425 | struct fc_rport *rport = fsp->rport; |
3a3b42bf | 1426 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1427 | |
1428 | if (fc_fcp_lock_pkt(fsp)) | |
1429 | return; | |
1430 | ||
1431 | if (fsp->cdb_cmd.fc_tm_flags) | |
1432 | goto unlock; | |
1433 | ||
ad3120cf HR |
1434 | if (fsp->lp->qfull) { |
1435 | FC_FCP_DBG(fsp, "fcp timeout, resetting timer delay %d\n", | |
1436 | fsp->timer_delay); | |
841b86f3 | 1437 | fsp->timer.function = fc_fcp_timeout; |
ad3120cf HR |
1438 | fc_fcp_timer_set(fsp, fsp->timer_delay); |
1439 | goto unlock; | |
1440 | } | |
1441 | FC_FCP_DBG(fsp, "fcp timeout, delay %d flags %x state %x\n", | |
1442 | fsp->timer_delay, rpriv->flags, fsp->state); | |
42e9a92f RL |
1443 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; |
1444 | ||
5b97fabd | 1445 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
a752359f | 1446 | fc_fcp_rec(fsp); |
5b97fabd VD |
1447 | else if (fsp->state & FC_SRB_RCV_STATUS) |
1448 | fc_fcp_complete_locked(fsp); | |
42e9a92f | 1449 | else |
ac17ea8d | 1450 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1451 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1452 | unlock: | |
1453 | fc_fcp_unlock_pkt(fsp); | |
1454 | } | |
1455 | ||
3a3b42bf RL |
1456 | /** |
1457 | * fc_fcp_rec() - Send a REC ELS request | |
1458 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1459 | */ |
1460 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1461 | { | |
3a3b42bf | 1462 | struct fc_lport *lport; |
42e9a92f RL |
1463 | struct fc_frame *fp; |
1464 | struct fc_rport *rport; | |
3a3b42bf | 1465 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1466 | |
3a3b42bf | 1467 | lport = fsp->lp; |
42e9a92f | 1468 | rport = fsp->rport; |
3a3b42bf RL |
1469 | rpriv = rport->dd_data; |
1470 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1471 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1472 | fsp->io_status = 0; |
42e9a92f RL |
1473 | fc_fcp_complete_locked(fsp); |
1474 | return; | |
1475 | } | |
e0883a3c | 1476 | |
c46be11a | 1477 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1478 | if (!fp) |
1479 | goto retry; | |
1480 | ||
1481 | fr_seq(fp) = fsp->seq_ptr; | |
1482 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
7b2787ec | 1483 | rpriv->local_port->port_id, FC_TYPE_ELS, |
24f089e2 | 1484 | FC_FCTL_REQ, 0); |
3a3b42bf RL |
1485 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1486 | fc_fcp_rec_resp, fsp, | |
3a91090f | 1487 | 2 * lport->r_a_tov)) { |
42e9a92f RL |
1488 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1489 | return; | |
1490 | } | |
42e9a92f RL |
1491 | retry: |
1492 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
3a91090f | 1493 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f | 1494 | else |
ac17ea8d | 1495 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1496 | } |
1497 | ||
3a3b42bf RL |
1498 | /** |
1499 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1500 | * @seq: The sequence the response is on | |
1501 | * @fp: The response frame | |
1502 | * @arg: The FCP packet the response is on | |
1503 | * | |
1504 | * If the response is a reject then the scsi layer will handle | |
1505 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1506 | * set the timeout and return. If the I/O was completed then complete the | |
1507 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1508 | */ |
1509 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1510 | { | |
1511 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1512 | struct fc_els_rec_acc *recp; | |
1513 | struct fc_els_ls_rjt *rjt; | |
1514 | u32 e_stat; | |
1515 | u8 opcode; | |
1516 | u32 offset; | |
1517 | enum dma_data_direction data_dir; | |
1518 | enum fc_rctl r_ctl; | |
3a3b42bf | 1519 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1520 | |
1521 | if (IS_ERR(fp)) { | |
1522 | fc_fcp_rec_error(fsp, fp); | |
1523 | return; | |
1524 | } | |
1525 | ||
1526 | if (fc_fcp_lock_pkt(fsp)) | |
1527 | goto out; | |
1528 | ||
1529 | fsp->recov_retry = 0; | |
1530 | opcode = fc_frame_payload_op(fp); | |
1531 | if (opcode == ELS_LS_RJT) { | |
1532 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1533 | switch (rjt->er_reason) { | |
1534 | default: | |
57d3ec7e HR |
1535 | FC_FCP_DBG(fsp, |
1536 | "device %x invalid REC reject %d/%d\n", | |
7414705e RL |
1537 | fsp->rport->port_id, rjt->er_reason, |
1538 | rjt->er_explan); | |
df561f66 | 1539 | fallthrough; |
42e9a92f | 1540 | case ELS_RJT_UNSUP: |
7414705e | 1541 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1542 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1543 | /* |
1544 | * if we do not spport RECs or got some bogus | |
1545 | * reason then resetup timer so we check for | |
1546 | * making progress. | |
1547 | */ | |
3a3b42bf | 1548 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1549 | break; |
1550 | case ELS_RJT_LOGIC: | |
1551 | case ELS_RJT_UNAB: | |
57d3ec7e HR |
1552 | FC_FCP_DBG(fsp, "device %x REC reject %d/%d\n", |
1553 | fsp->rport->port_id, rjt->er_reason, | |
1554 | rjt->er_explan); | |
42e9a92f | 1555 | /* |
9ca1e182 HR |
1556 | * If response got lost or is stuck in the |
1557 | * queue somewhere we have no idea if and when | |
1558 | * the response will be received. So quarantine | |
1559 | * the xid and retry the command. | |
42e9a92f | 1560 | */ |
9ca1e182 HR |
1561 | if (rjt->er_explan == ELS_EXPL_OXID_RXID) { |
1562 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); | |
1563 | ep->state |= FC_EX_QUARANTINE; | |
a0452bb4 HR |
1564 | fsp->state |= FC_SRB_ABORTED; |
1565 | fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); | |
42e9a92f RL |
1566 | break; |
1567 | } | |
a0452bb4 | 1568 | fc_fcp_recovery(fsp, FC_TRANS_RESET); |
42e9a92f RL |
1569 | break; |
1570 | } | |
1571 | } else if (opcode == ELS_LS_ACC) { | |
1572 | if (fsp->state & FC_SRB_ABORTED) | |
1573 | goto unlock_out; | |
1574 | ||
1575 | data_dir = fsp->cmd->sc_data_direction; | |
1576 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1577 | offset = ntohl(recp->reca_fc4value); | |
1578 | e_stat = ntohl(recp->reca_e_stat); | |
1579 | ||
1580 | if (e_stat & ESB_ST_COMPLETE) { | |
1581 | ||
1582 | /* | |
1583 | * The exchange is complete. | |
1584 | * | |
1585 | * For output, we must've lost the response. | |
1586 | * For input, all data must've been sent. | |
1587 | * We lost may have lost the response | |
1588 | * (and a confirmation was requested) and maybe | |
1589 | * some data. | |
1590 | * | |
1591 | * If all data received, send SRR | |
1592 | * asking for response. If partial data received, | |
1593 | * or gaps, SRR requests data at start of gap. | |
1594 | * Recovery via SRR relies on in-order-delivery. | |
1595 | */ | |
1596 | if (data_dir == DMA_TO_DEVICE) { | |
1597 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1598 | } else if (fsp->xfer_contig_end == offset) { | |
1599 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1600 | } else { | |
1601 | offset = fsp->xfer_contig_end; | |
1602 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1603 | } | |
1604 | fc_fcp_srr(fsp, r_ctl, offset); | |
1605 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
42e9a92f RL |
1606 | /* |
1607 | * The remote port has the initiative, so just | |
1608 | * keep waiting for it to complete. | |
1609 | */ | |
f2817ec2 | 1610 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1611 | } else { |
1612 | ||
1613 | /* | |
1614 | * The exchange is incomplete, we have seq. initiative. | |
1615 | * Lost response with requested confirmation, | |
1616 | * lost confirmation, lost transfer ready or | |
1617 | * lost write data. | |
1618 | * | |
1619 | * For output, if not all data was received, ask | |
1620 | * for transfer ready to be repeated. | |
1621 | * | |
1622 | * If we received or sent all the data, send SRR to | |
1623 | * request response. | |
1624 | * | |
1625 | * If we lost a response, we may have lost some read | |
1626 | * data as well. | |
1627 | */ | |
1628 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1629 | if (data_dir == DMA_TO_DEVICE) { | |
1630 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1631 | if (offset < fsp->data_len) | |
1632 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1633 | } else if (offset == fsp->xfer_contig_end) { | |
1634 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1635 | } else if (fsp->xfer_contig_end < offset) { | |
1636 | offset = fsp->xfer_contig_end; | |
1637 | } | |
1638 | fc_fcp_srr(fsp, r_ctl, offset); | |
1639 | } | |
1640 | } | |
1641 | unlock_out: | |
1642 | fc_fcp_unlock_pkt(fsp); | |
1643 | out: | |
1644 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1645 | fc_frame_free(fp); | |
1646 | } | |
1647 | ||
3a3b42bf RL |
1648 | /** |
1649 | * fc_fcp_rec_error() - Handler for REC errors | |
1650 | * @fsp: The FCP packet the error is on | |
1651 | * @fp: The REC frame | |
42e9a92f RL |
1652 | */ |
1653 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1654 | { | |
1655 | int error = PTR_ERR(fp); | |
1656 | ||
1657 | if (fc_fcp_lock_pkt(fsp)) | |
1658 | goto out; | |
1659 | ||
1660 | switch (error) { | |
1661 | case -FC_EX_CLOSED: | |
57d3ec7e HR |
1662 | FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange closed\n", |
1663 | fsp, fsp->rport->port_id); | |
a0452bb4 | 1664 | fc_fcp_retry_cmd(fsp, FC_ERROR); |
42e9a92f RL |
1665 | break; |
1666 | ||
1667 | default: | |
ce8b5df0 | 1668 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1669 | fsp, fsp->rport->port_id, error); |
42e9a92f | 1670 | fsp->status_code = FC_CMD_PLOGO; |
df561f66 | 1671 | fallthrough; |
42e9a92f RL |
1672 | |
1673 | case -FC_EX_TIMEOUT: | |
1674 | /* | |
1675 | * Assume REC or LS_ACC was lost. | |
1676 | * The exchange manager will have aborted REC, so retry. | |
1677 | */ | |
57d3ec7e HR |
1678 | FC_FCP_DBG(fsp, "REC %p fid %6.6x exchange timeout retry %d/%d\n", |
1679 | fsp, fsp->rport->port_id, fsp->recov_retry, | |
7414705e | 1680 | FC_MAX_RECOV_RETRY); |
42e9a92f RL |
1681 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1682 | fc_fcp_rec(fsp); | |
1683 | else | |
ac17ea8d | 1684 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1685 | break; |
1686 | } | |
1687 | fc_fcp_unlock_pkt(fsp); | |
1688 | out: | |
1689 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1690 | } | |
1691 | ||
3a3b42bf | 1692 | /** |
5c12c418 VD |
1693 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1694 | * @fsp: The FCP pkt that needs to be aborted | |
ebb40ab6 | 1695 | * @code: The FCP status code to set |
42e9a92f | 1696 | */ |
ac17ea8d | 1697 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) |
42e9a92f | 1698 | { |
57d3ec7e | 1699 | FC_FCP_DBG(fsp, "start recovery code %x\n", code); |
ac17ea8d | 1700 | fsp->status_code = code; |
42e9a92f RL |
1701 | fsp->cdb_status = 0; |
1702 | fsp->io_status = 0; | |
1703 | /* | |
1704 | * if this fails then we let the scsi command timer fire and | |
1705 | * scsi-ml escalate. | |
1706 | */ | |
1707 | fc_fcp_send_abort(fsp); | |
1708 | } | |
1709 | ||
3a3b42bf RL |
1710 | /** |
1711 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1712 | * @fsp: The FCP packet the SRR is to be sent on | |
1713 | * @r_ctl: The R_CTL field for the SRR request | |
ebb40ab6 | 1714 | * @offset: The SRR relative offset |
42e9a92f RL |
1715 | * This is called after receiving status but insufficient data, or |
1716 | * when expecting status but the request has timed out. | |
1717 | */ | |
1718 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1719 | { | |
3a3b42bf | 1720 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1721 | struct fc_rport *rport; |
3a3b42bf | 1722 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1723 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1724 | struct fc_seq *seq; | |
1725 | struct fcp_srr *srr; | |
1726 | struct fc_frame *fp; | |
42e9a92f RL |
1727 | |
1728 | rport = fsp->rport; | |
3a3b42bf | 1729 | rpriv = rport->dd_data; |
42e9a92f | 1730 | |
3a3b42bf RL |
1731 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1732 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1733 | goto retry; /* shouldn't happen */ |
c46be11a | 1734 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1735 | if (!fp) |
1736 | goto retry; | |
1737 | ||
1738 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1739 | memset(srr, 0, sizeof(*srr)); | |
1740 | srr->srr_op = ELS_SRR; | |
1741 | srr->srr_ox_id = htons(ep->oxid); | |
1742 | srr->srr_rx_id = htons(ep->rxid); | |
1743 | srr->srr_r_ctl = r_ctl; | |
1744 | srr->srr_rel_off = htonl(offset); | |
1745 | ||
1746 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
7b2787ec | 1747 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1748 | FC_FCTL_REQ, 0); |
42e9a92f | 1749 | |
3afd2d15 HR |
1750 | seq = fc_exch_seq_send(lport, fp, fc_fcp_srr_resp, |
1751 | fc_fcp_pkt_destroy, | |
1752 | fsp, get_fsp_rec_tov(fsp)); | |
8f550f93 | 1753 | if (!seq) |
42e9a92f | 1754 | goto retry; |
8f550f93 | 1755 | |
42e9a92f RL |
1756 | fsp->recov_seq = seq; |
1757 | fsp->xfer_len = offset; | |
1758 | fsp->xfer_contig_end = offset; | |
1759 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1760 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1761 | return; | |
1762 | retry: | |
a0452bb4 | 1763 | fc_fcp_retry_cmd(fsp, FC_TRANS_RESET); |
42e9a92f RL |
1764 | } |
1765 | ||
3a3b42bf RL |
1766 | /** |
1767 | * fc_fcp_srr_resp() - Handler for SRR response | |
1768 | * @seq: The sequence the SRR is on | |
1769 | * @fp: The SRR frame | |
1770 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1771 | */ |
1772 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1773 | { | |
1774 | struct fc_fcp_pkt *fsp = arg; | |
1775 | struct fc_frame_header *fh; | |
1776 | ||
1777 | if (IS_ERR(fp)) { | |
1778 | fc_fcp_srr_error(fsp, fp); | |
1779 | return; | |
1780 | } | |
1781 | ||
1782 | if (fc_fcp_lock_pkt(fsp)) | |
1783 | goto out; | |
1784 | ||
1785 | fh = fc_frame_header_get(fp); | |
1786 | /* | |
768c72cc | 1787 | * BUG? fc_fcp_srr_error calls fc_exch_done which would release |
42e9a92f | 1788 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, |
768c72cc | 1789 | * then fc_exch_timeout would be sending an abort. The fc_exch_done |
42e9a92f RL |
1790 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing |
1791 | * an abort response though. | |
1792 | */ | |
1793 | if (fh->fh_type == FC_TYPE_BLS) { | |
1794 | fc_fcp_unlock_pkt(fsp); | |
1795 | return; | |
1796 | } | |
1797 | ||
42e9a92f RL |
1798 | switch (fc_frame_payload_op(fp)) { |
1799 | case ELS_LS_ACC: | |
1800 | fsp->recov_retry = 0; | |
f2817ec2 | 1801 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1802 | break; |
1803 | case ELS_LS_RJT: | |
1804 | default: | |
ac17ea8d | 1805 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1806 | break; |
1807 | } | |
1808 | fc_fcp_unlock_pkt(fsp); | |
42e9a92f | 1809 | out: |
768c72cc | 1810 | fc_exch_done(seq); |
42e9a92f | 1811 | fc_frame_free(fp); |
42e9a92f RL |
1812 | } |
1813 | ||
3a3b42bf RL |
1814 | /** |
1815 | * fc_fcp_srr_error() - Handler for SRR errors | |
1816 | * @fsp: The FCP packet that the SRR error is on | |
1817 | * @fp: The SRR frame | |
1818 | */ | |
42e9a92f RL |
1819 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1820 | { | |
1821 | if (fc_fcp_lock_pkt(fsp)) | |
1822 | goto out; | |
42e9a92f RL |
1823 | switch (PTR_ERR(fp)) { |
1824 | case -FC_EX_TIMEOUT: | |
57d3ec7e | 1825 | FC_FCP_DBG(fsp, "SRR timeout, retries %d\n", fsp->recov_retry); |
42e9a92f RL |
1826 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1827 | fc_fcp_rec(fsp); | |
1828 | else | |
ac17ea8d | 1829 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1830 | break; |
1831 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
57d3ec7e | 1832 | FC_FCP_DBG(fsp, "SRR error, exchange closed\n"); |
df561f66 | 1833 | fallthrough; |
42e9a92f | 1834 | default: |
a0452bb4 | 1835 | fc_fcp_retry_cmd(fsp, FC_ERROR); |
42e9a92f RL |
1836 | break; |
1837 | } | |
1838 | fc_fcp_unlock_pkt(fsp); | |
1839 | out: | |
768c72cc | 1840 | fc_exch_done(fsp->recov_seq); |
42e9a92f RL |
1841 | } |
1842 | ||
3a3b42bf RL |
1843 | /** |
1844 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1845 | * @lport: The local port to be checked | |
1846 | */ | |
1847 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1848 | { |
1849 | /* lock ? */ | |
3a3b42bf RL |
1850 | return (lport->state == LPORT_ST_READY) && |
1851 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1852 | } |
1853 | ||
1854 | /** | |
3a3b42bf | 1855 | * fc_queuecommand() - The queuecommand function of the SCSI template |
04885b16 | 1856 | * @shost: The Scsi_Host that the command was issued to |
ebb40ab6 | 1857 | * @sc_cmd: The scsi_cmnd to be executed |
42e9a92f | 1858 | * |
04885b16 | 1859 | * This is the i/o strategy routine, called by the SCSI layer. |
42e9a92f | 1860 | */ |
04885b16 | 1861 | int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) |
42e9a92f | 1862 | { |
04885b16 | 1863 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
1864 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1865 | struct fc_fcp_pkt *fsp; | |
42e9a92f RL |
1866 | int rval; |
1867 | int rc = 0; | |
1bd49b48 | 1868 | struct fc_stats *stats; |
42e9a92f | 1869 | |
42e9a92f RL |
1870 | rval = fc_remote_port_chkready(rport); |
1871 | if (rval) { | |
1872 | sc_cmd->result = rval; | |
04885b16 | 1873 | sc_cmd->scsi_done(sc_cmd); |
be948fc3 | 1874 | return 0; |
42e9a92f RL |
1875 | } |
1876 | ||
1877 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1878 | /* | |
1879 | * rport is transitioning from blocked/deleted to | |
1880 | * online | |
1881 | */ | |
1882 | sc_cmd->result = DID_IMM_RETRY << 16; | |
04885b16 | 1883 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
1884 | goto out; |
1885 | } | |
1886 | ||
3a3b42bf | 1887 | if (!fc_fcp_lport_queue_ready(lport)) { |
5d339d16 | 1888 | if (lport->qfull) { |
c1061255 HR |
1889 | if (fc_fcp_can_queue_ramp_down(lport)) |
1890 | shost_printk(KERN_ERR, lport->host, | |
1891 | "libfc: queue full, " | |
1892 | "reducing can_queue to %d.\n", | |
1893 | lport->host->can_queue); | |
5d339d16 | 1894 | } |
42e9a92f RL |
1895 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1896 | goto out; | |
1897 | } | |
1898 | ||
3a3b42bf | 1899 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1900 | if (fsp == NULL) { |
1901 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1902 | goto out; | |
1903 | } | |
1904 | ||
1905 | /* | |
1906 | * build the libfc request pkt | |
1907 | */ | |
1908 | fsp->cmd = sc_cmd; /* save the cmd */ | |
42e9a92f | 1909 | fsp->rport = rport; /* set the remote port ptr */ |
42e9a92f RL |
1910 | |
1911 | /* | |
1912 | * set up the transfer length | |
1913 | */ | |
1914 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1915 | fsp->xfer_len = 0; | |
1916 | ||
1917 | /* | |
1918 | * setup the data direction | |
1919 | */ | |
1bd49b48 | 1920 | stats = per_cpu_ptr(lport->stats, get_cpu()); |
42e9a92f RL |
1921 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1922 | fsp->req_flags = FC_SRB_READ; | |
1923 | stats->InputRequests++; | |
5f0e385f | 1924 | stats->InputBytes += fsp->data_len; |
42e9a92f RL |
1925 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
1926 | fsp->req_flags = FC_SRB_WRITE; | |
1927 | stats->OutputRequests++; | |
5f0e385f | 1928 | stats->OutputBytes += fsp->data_len; |
42e9a92f RL |
1929 | } else { |
1930 | fsp->req_flags = 0; | |
1931 | stats->ControlRequests++; | |
1932 | } | |
f018b73a | 1933 | put_cpu(); |
42e9a92f | 1934 | |
42e9a92f RL |
1935 | /* |
1936 | * send it to the lower layer | |
1937 | * if we get -1 return then put the request in the pending | |
1938 | * queue. | |
1939 | */ | |
3a3b42bf | 1940 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1941 | if (rval != 0) { |
1942 | fsp->state = FC_SRB_FREE; | |
1943 | fc_fcp_pkt_release(fsp); | |
1944 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1945 | } | |
1946 | out: | |
1947 | return rc; | |
1948 | } | |
1949 | EXPORT_SYMBOL(fc_queuecommand); | |
1950 | ||
1951 | /** | |
3a3b42bf RL |
1952 | * fc_io_compl() - Handle responses for completed commands |
1953 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1954 | * |
3a3b42bf | 1955 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1956 | * The fcp packet lock must be held when calling. |
1957 | */ | |
1958 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1959 | { | |
1960 | struct fc_fcp_internal *si; | |
1961 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1962 | struct fc_lport *lport; |
42e9a92f RL |
1963 | unsigned long flags; |
1964 | ||
b277d2aa YZ |
1965 | /* release outstanding ddp context */ |
1966 | fc_fcp_ddp_done(fsp); | |
1967 | ||
42e9a92f RL |
1968 | fsp->state |= FC_SRB_COMPL; |
1969 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1970 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1971 | del_timer_sync(&fsp->timer); | |
1972 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1973 | } | |
1974 | ||
3a3b42bf RL |
1975 | lport = fsp->lp; |
1976 | si = fc_get_scsi_internal(lport); | |
42e9a92f RL |
1977 | |
1978 | /* | |
84c3e1ad VD |
1979 | * if can_queue ramp down is done then try can_queue ramp up |
1980 | * since commands are completing now. | |
42e9a92f | 1981 | */ |
84c3e1ad VD |
1982 | if (si->last_can_queue_ramp_down_time) |
1983 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1984 | |
1985 | sc_cmd = fsp->cmd; | |
42e9a92f RL |
1986 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; |
1987 | switch (fsp->status_code) { | |
1988 | case FC_COMPLETE: | |
1989 | if (fsp->cdb_status == 0) { | |
1990 | /* | |
1991 | * good I/O status | |
1992 | */ | |
1993 | sc_cmd->result = DID_OK << 16; | |
1994 | if (fsp->scsi_resid) | |
1995 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1996 | } else { |
1997 | /* | |
1998 | * transport level I/O was ok but scsi | |
1999 | * has non zero status | |
2000 | */ | |
2001 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
2002 | } | |
2003 | break; | |
2004 | case FC_ERROR: | |
b3ef990c RL |
2005 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2006 | "due to FC_ERROR\n"); | |
42e9a92f RL |
2007 | sc_cmd->result = DID_ERROR << 16; |
2008 | break; | |
2009 | case FC_DATA_UNDRUN: | |
26d9cab5 | 2010 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
2011 | /* |
2012 | * scsi status is good but transport level | |
26d9cab5 | 2013 | * underrun. |
42e9a92f | 2014 | */ |
b3ef990c RL |
2015 | if (fsp->state & FC_SRB_RCV_STATUS) { |
2016 | sc_cmd->result = DID_OK << 16; | |
2017 | } else { | |
2018 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
2019 | " due to FC_DATA_UNDRUN (trans)\n"); | |
2020 | sc_cmd->result = DID_ERROR << 16; | |
2021 | } | |
42e9a92f RL |
2022 | } else { |
2023 | /* | |
2024 | * scsi got underrun, this is an error | |
2025 | */ | |
b3ef990c RL |
2026 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2027 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
42e9a92f RL |
2028 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
2029 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
2030 | } | |
2031 | break; | |
2032 | case FC_DATA_OVRRUN: | |
2033 | /* | |
2034 | * overrun is an error | |
2035 | */ | |
b3ef990c RL |
2036 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2037 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
2038 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
2039 | break; | |
2040 | case FC_CMD_ABORTED: | |
0f4c16a2 HR |
2041 | if (host_byte(sc_cmd->result) == DID_TIME_OUT) |
2042 | FC_FCP_DBG(fsp, "Returning DID_TIME_OUT to scsi-ml " | |
2043 | "due to FC_CMD_ABORTED\n"); | |
2044 | else { | |
2045 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " | |
2046 | "due to FC_CMD_ABORTED\n"); | |
2047 | set_host_byte(sc_cmd, DID_ERROR); | |
2048 | } | |
2049 | sc_cmd->result |= fsp->io_status; | |
42e9a92f | 2050 | break; |
42e9a92f | 2051 | case FC_CMD_RESET: |
ac17ea8d | 2052 | FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " |
2053 | "due to FC_CMD_RESET\n"); | |
42e9a92f RL |
2054 | sc_cmd->result = (DID_RESET << 16); |
2055 | break; | |
a0452bb4 HR |
2056 | case FC_TRANS_RESET: |
2057 | FC_FCP_DBG(fsp, "Returning DID_SOFT_ERROR to scsi-ml " | |
2058 | "due to FC_TRANS_RESET\n"); | |
2059 | sc_cmd->result = (DID_SOFT_ERROR << 16); | |
2060 | break; | |
42e9a92f | 2061 | case FC_HRD_ERROR: |
ac17ea8d | 2062 | FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " |
2063 | "due to FC_HRD_ERROR\n"); | |
42e9a92f RL |
2064 | sc_cmd->result = (DID_NO_CONNECT << 16); |
2065 | break; | |
ac17ea8d | 2066 | case FC_CRC_ERROR: |
2067 | FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " | |
2068 | "due to FC_CRC_ERROR\n"); | |
2069 | sc_cmd->result = (DID_PARITY << 16); | |
2070 | break; | |
2071 | case FC_TIMED_OUT: | |
2072 | FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " | |
2073 | "due to FC_TIMED_OUT\n"); | |
2074 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
2075 | break; | |
42e9a92f | 2076 | default: |
b3ef990c RL |
2077 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2078 | "due to unknown error\n"); | |
42e9a92f RL |
2079 | sc_cmd->result = (DID_ERROR << 16); |
2080 | break; | |
2081 | } | |
2082 | ||
75eee725 VD |
2083 | if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) |
2084 | sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); | |
e0d93c5b | 2085 | |
c1ecb90a | 2086 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2087 | list_del(&fsp->list); |
2088 | sc_cmd->SCp.ptr = NULL; | |
8b7ac2bb | 2089 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f | 2090 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
2091 | |
2092 | /* release ref from initial allocation in queue command */ | |
2093 | fc_fcp_pkt_release(fsp); | |
2094 | } | |
2095 | ||
42e9a92f | 2096 | /** |
34f42a07 | 2097 | * fc_eh_abort() - Abort a command |
3a3b42bf | 2098 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 2099 | * |
3a3b42bf RL |
2100 | * From SCSI host template. |
2101 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
2102 | */ |
2103 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
2104 | { | |
2105 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 2106 | struct fc_lport *lport; |
8b7ac2bb | 2107 | struct fc_fcp_internal *si; |
42e9a92f RL |
2108 | int rc = FAILED; |
2109 | unsigned long flags; | |
21cc0bd3 VD |
2110 | int rval; |
2111 | ||
2112 | rval = fc_block_scsi_eh(sc_cmd); | |
2113 | if (rval) | |
2114 | return rval; | |
42e9a92f | 2115 | |
3a3b42bf RL |
2116 | lport = shost_priv(sc_cmd->device->host); |
2117 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2118 | return rc; |
3a3b42bf | 2119 | else if (!lport->link_up) |
42e9a92f RL |
2120 | return rc; |
2121 | ||
8b7ac2bb VD |
2122 | si = fc_get_scsi_internal(lport); |
2123 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f RL |
2124 | fsp = CMD_SP(sc_cmd); |
2125 | if (!fsp) { | |
2126 | /* command completed while scsi eh was setting up */ | |
3c2c3bf2 | 2127 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2128 | return SUCCESS; |
2129 | } | |
83a35e36 | 2130 | /* grab a ref so the fsp and sc_cmd cannot be released from under us */ |
42e9a92f | 2131 | fc_fcp_pkt_hold(fsp); |
8b7ac2bb | 2132 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2133 | |
2134 | if (fc_fcp_lock_pkt(fsp)) { | |
2135 | /* completed while we were waiting for timer to be deleted */ | |
2136 | rc = SUCCESS; | |
2137 | goto release_pkt; | |
2138 | } | |
2139 | ||
c340111d | 2140 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2141 | fc_fcp_unlock_pkt(fsp); |
2142 | ||
2143 | release_pkt: | |
2144 | fc_fcp_pkt_release(fsp); | |
2145 | return rc; | |
2146 | } | |
2147 | EXPORT_SYMBOL(fc_eh_abort); | |
2148 | ||
2149 | /** | |
3a3b42bf RL |
2150 | * fc_eh_device_reset() - Reset a single LUN |
2151 | * @sc_cmd: The SCSI command which identifies the device whose | |
2152 | * LUN is to be reset | |
42e9a92f | 2153 | * |
3a3b42bf | 2154 | * Set from SCSI host template. |
42e9a92f RL |
2155 | */ |
2156 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2157 | { | |
3a3b42bf | 2158 | struct fc_lport *lport; |
42e9a92f RL |
2159 | struct fc_fcp_pkt *fsp; |
2160 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2161 | int rc = FAILED; | |
42e9a92f RL |
2162 | int rval; |
2163 | ||
21cc0bd3 | 2164 | rval = fc_block_scsi_eh(sc_cmd); |
42e9a92f | 2165 | if (rval) |
21cc0bd3 | 2166 | return rval; |
42e9a92f | 2167 | |
3a3b42bf | 2168 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2169 | |
3a3b42bf | 2170 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2171 | return rc; |
2172 | ||
ce8b5df0 | 2173 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2174 | |
3a3b42bf | 2175 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2176 | if (fsp == NULL) { |
7414705e | 2177 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2178 | goto out; |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2183 | * the sc passed in is not setup for execution like when sent | |
2184 | * through the queuecommand callout. | |
2185 | */ | |
42e9a92f RL |
2186 | fsp->rport = rport; /* set the remote port ptr */ |
2187 | ||
2188 | /* | |
2189 | * flush outstanding commands | |
2190 | */ | |
3a3b42bf | 2191 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2192 | fsp->state = FC_SRB_FREE; |
2193 | fc_fcp_pkt_release(fsp); | |
2194 | ||
2195 | out: | |
2196 | return rc; | |
2197 | } | |
2198 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2199 | ||
2200 | /** | |
3a3b42bf RL |
2201 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2202 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2203 | */ |
2204 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2205 | { | |
2206 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2207 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2208 | unsigned long wait_tmo; |
2209 | ||
3a3b42bf | 2210 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2211 | |
31c0a631 | 2212 | fc_lport_reset(lport); |
42e9a92f | 2213 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2214 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2215 | wait_tmo)) | |
42e9a92f RL |
2216 | msleep(1000); |
2217 | ||
3a3b42bf | 2218 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2219 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
7b2787ec | 2220 | "on port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2221 | return SUCCESS; |
2222 | } else { | |
7414705e | 2223 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2224 | "port (%6.6x) is not ready.\n", |
7b2787ec | 2225 | lport->port_id); |
42e9a92f RL |
2226 | return FAILED; |
2227 | } | |
2228 | } | |
2229 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2230 | ||
2231 | /** | |
3a3b42bf RL |
2232 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2233 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2234 | * |
2235 | * Configures queue depth based on host's cmd_per_len. If not set | |
2236 | * then we use the libfc default. | |
2237 | */ | |
2238 | int fc_slave_alloc(struct scsi_device *sdev) | |
2239 | { | |
2240 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2241 | |
2242 | if (!rport || fc_remote_port_chkready(rport)) | |
2243 | return -ENXIO; | |
2244 | ||
db5ed4df | 2245 | scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH); |
42e9a92f RL |
2246 | return 0; |
2247 | } | |
2248 | EXPORT_SYMBOL(fc_slave_alloc); | |
2249 | ||
3a3b42bf RL |
2250 | /** |
2251 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2252 | * @lport: The local port that no longer needs the FCP layer | |
2253 | */ | |
2254 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2255 | { |
3a3b42bf | 2256 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2257 | |
2258 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2259 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
7b2787ec | 2260 | "port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2261 | |
2262 | mempool_destroy(si->scsi_pkt_pool); | |
2263 | kfree(si); | |
3a3b42bf | 2264 | lport->scsi_priv = NULL; |
42e9a92f RL |
2265 | } |
2266 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2267 | ||
55204909 | 2268 | int fc_setup_fcp(void) |
93e6d5ab RL |
2269 | { |
2270 | int rc = 0; | |
2271 | ||
2272 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2273 | sizeof(struct fc_fcp_pkt), | |
2274 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2275 | if (!scsi_pkt_cachep) { | |
2276 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2277 | "module load failed!"); | |
2278 | rc = -ENOMEM; | |
2279 | } | |
2280 | ||
2281 | return rc; | |
2282 | } | |
2283 | ||
55204909 | 2284 | void fc_destroy_fcp(void) |
93e6d5ab | 2285 | { |
b6876a84 | 2286 | kmem_cache_destroy(scsi_pkt_cachep); |
93e6d5ab RL |
2287 | } |
2288 | ||
3a3b42bf RL |
2289 | /** |
2290 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2291 | * @lport: The local port to initialize the exchange layer for | |
2292 | */ | |
2293 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2294 | { |
2295 | int rc; | |
2296 | struct fc_fcp_internal *si; | |
2297 | ||
3a3b42bf RL |
2298 | if (!lport->tt.fcp_cmd_send) |
2299 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2300 | |
3a3b42bf RL |
2301 | if (!lport->tt.fcp_cleanup) |
2302 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2303 | |
3a3b42bf RL |
2304 | if (!lport->tt.fcp_abort_io) |
2305 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2306 | |
2307 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2308 | if (!si) | |
2309 | return -ENOMEM; | |
3a3b42bf | 2310 | lport->scsi_priv = si; |
84c3e1ad | 2311 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2312 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2313 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2314 | |
2315 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2316 | if (!si->scsi_pkt_pool) { | |
2317 | rc = -ENOMEM; | |
2318 | goto free_internal; | |
2319 | } | |
2320 | return 0; | |
2321 | ||
2322 | free_internal: | |
2323 | kfree(si); | |
2324 | return rc; | |
2325 | } | |
2326 | EXPORT_SYMBOL(fc_fcp_init); |