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42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. | |
3 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. | |
4 | * Copyright(c) 2008 Mike Christie | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | * | |
19 | * Maintained at www.Open-FCoE.org | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/scatterlist.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/crc32.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
42e9a92f RL |
31 | |
32 | #include <scsi/scsi_tcq.h> | |
33 | #include <scsi/scsi.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi_device.h> | |
36 | #include <scsi/scsi_cmnd.h> | |
37 | ||
38 | #include <scsi/fc/fc_fc2.h> | |
39 | ||
40 | #include <scsi/libfc.h> | |
41 | #include <scsi/fc_encode.h> | |
42 | ||
8866a5d9 | 43 | #include "fc_libfc.h" |
42e9a92f | 44 | |
55204909 | 45 | static struct kmem_cache *scsi_pkt_cachep; |
42e9a92f RL |
46 | |
47 | /* SRB state definitions */ | |
48 | #define FC_SRB_FREE 0 /* cmd is free */ | |
49 | #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ | |
50 | #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ | |
51 | #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ | |
3ad2f3fb | 52 | #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ |
42e9a92f RL |
53 | #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ |
54 | #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ | |
55 | #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ | |
42e9a92f RL |
56 | |
57 | #define FC_SRB_READ (1 << 1) | |
58 | #define FC_SRB_WRITE (1 << 0) | |
59 | ||
60 | /* | |
8b7ac2bb | 61 | * The SCp.ptr should be tested and set under the scsi_pkt_queue lock |
42e9a92f RL |
62 | */ |
63 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) | |
64 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) | |
65 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) | |
66 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) | |
67 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) | |
68 | ||
3a3b42bf RL |
69 | /** |
70 | * struct fc_fcp_internal - FCP layer internal data | |
c1ecb90a CL |
71 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
72 | * @scsi_queue_lock: Protects the scsi_pkt_queue | |
3a3b42bf | 73 | * @scsi_pkt_queue: Current FCP packets |
84c3e1ad VD |
74 | * @last_can_queue_ramp_down_time: ramp down time |
75 | * @last_can_queue_ramp_up_time: ramp up time | |
76 | * @max_can_queue: max can_queue size | |
3a3b42bf | 77 | */ |
42e9a92f | 78 | struct fc_fcp_internal { |
c1ecb90a CL |
79 | mempool_t *scsi_pkt_pool; |
80 | spinlock_t scsi_queue_lock; | |
81 | struct list_head scsi_pkt_queue; | |
82 | unsigned long last_can_queue_ramp_down_time; | |
83 | unsigned long last_can_queue_ramp_up_time; | |
84 | int max_can_queue; | |
42e9a92f RL |
85 | }; |
86 | ||
87 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
88 | ||
89 | /* | |
90 | * function prototypes | |
91 | * FC scsi I/O related functions | |
92 | */ | |
93 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
94 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
95 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
96 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
97 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 98 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
ac17ea8d | 99 | static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); |
3a3b42bf | 100 | static void fc_fcp_timeout(unsigned long); |
42e9a92f RL |
101 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
102 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
103 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
104 | static void fc_io_compl(struct fc_fcp_pkt *); | |
105 | ||
106 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
107 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
108 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
109 | ||
110 | /* | |
111 | * command status codes | |
112 | */ | |
113 | #define FC_COMPLETE 0 | |
114 | #define FC_CMD_ABORTED 1 | |
115 | #define FC_CMD_RESET 2 | |
116 | #define FC_CMD_PLOGO 3 | |
117 | #define FC_SNS_RCV 4 | |
118 | #define FC_TRANS_ERR 5 | |
119 | #define FC_DATA_OVRRUN 6 | |
120 | #define FC_DATA_UNDRUN 7 | |
121 | #define FC_ERROR 8 | |
122 | #define FC_HRD_ERROR 9 | |
ac17ea8d | 123 | #define FC_CRC_ERROR 10 |
124 | #define FC_TIMED_OUT 11 | |
42e9a92f RL |
125 | |
126 | /* | |
127 | * Error recovery timeout values. | |
128 | */ | |
42e9a92f | 129 | #define FC_SCSI_TM_TOV (10 * HZ) |
42e9a92f | 130 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
84c3e1ad | 131 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
42e9a92f RL |
132 | |
133 | #define FC_MAX_ERROR_CNT 5 | |
134 | #define FC_MAX_RECOV_RETRY 3 | |
135 | ||
136 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
137 | ||
138 | /** | |
3a3b42bf RL |
139 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
140 | * @lport: The local port that the FCP packet is for | |
141 | * @gfp: GFP flags for allocation | |
42e9a92f | 142 | * |
3a3b42bf RL |
143 | * Return value: fcp_pkt structure or null on allocation failure. |
144 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 145 | */ |
3a3b42bf | 146 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 147 | { |
3a3b42bf | 148 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
149 | struct fc_fcp_pkt *fsp; |
150 | ||
151 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
152 | if (fsp) { | |
153 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 154 | fsp->lp = lport; |
f56635a8 | 155 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
156 | atomic_set(&fsp->ref_cnt, 1); |
157 | init_timer(&fsp->timer); | |
76ffe8a3 | 158 | fsp->timer.data = (unsigned long)fsp; |
42e9a92f RL |
159 | INIT_LIST_HEAD(&fsp->list); |
160 | spin_lock_init(&fsp->scsi_pkt_lock); | |
0f02a665 VD |
161 | } else { |
162 | per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++; | |
163 | put_cpu(); | |
42e9a92f RL |
164 | } |
165 | return fsp; | |
166 | } | |
167 | ||
168 | /** | |
3a3b42bf RL |
169 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
170 | * @fsp: The FCP packet to be released | |
42e9a92f | 171 | * |
3a3b42bf RL |
172 | * Context: Can be called from process or interrupt context, |
173 | * no lock is required. | |
42e9a92f RL |
174 | */ |
175 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
176 | { | |
177 | if (atomic_dec_and_test(&fsp->ref_cnt)) { | |
178 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); | |
179 | ||
180 | mempool_free(fsp, si->scsi_pkt_pool); | |
181 | } | |
182 | } | |
183 | ||
3a3b42bf RL |
184 | /** |
185 | * fc_fcp_pkt_hold() - Hold a fcp_pkt | |
186 | * @fsp: The FCP packet to be held | |
187 | */ | |
42e9a92f RL |
188 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
189 | { | |
190 | atomic_inc(&fsp->ref_cnt); | |
191 | } | |
192 | ||
193 | /** | |
3a3b42bf RL |
194 | * fc_fcp_pkt_destory() - Release hold on a fcp_pkt |
195 | * @seq: The sequence that the FCP packet is on (required by destructor API) | |
196 | * @fsp: The FCP packet to be released | |
197 | * | |
198 | * This routine is called by a destructor callback in the exch_seq_send() | |
199 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required | |
200 | * argument even though it is not used by this routine. | |
42e9a92f | 201 | * |
3a3b42bf | 202 | * Context: No locking required. |
42e9a92f RL |
203 | */ |
204 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
205 | { | |
206 | fc_fcp_pkt_release(fsp); | |
207 | } | |
208 | ||
209 | /** | |
3a3b42bf RL |
210 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
211 | * @fsp: The FCP packet to be locked and incremented | |
42e9a92f | 212 | * |
3a3b42bf | 213 | * We should only return error if we return a command to SCSI-ml before |
42e9a92f RL |
214 | * getting a response. This can happen in cases where we send a abort, but |
215 | * do not wait for the response and the abort and command can be passing | |
216 | * each other on the wire/network-layer. | |
217 | * | |
218 | * Note: this function locks the packet and gets a reference to allow | |
219 | * callers to call the completion function while the lock is held and | |
220 | * not have to worry about the packets refcount. | |
221 | * | |
222 | * TODO: Maybe we should just have callers grab/release the lock and | |
223 | * have a function that they call to verify the fsp and grab a ref if | |
224 | * needed. | |
225 | */ | |
226 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
227 | { | |
228 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
229 | if (fsp->state & FC_SRB_COMPL) { | |
230 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
231 | return -EPERM; | |
232 | } | |
233 | ||
234 | fc_fcp_pkt_hold(fsp); | |
235 | return 0; | |
236 | } | |
237 | ||
3a3b42bf RL |
238 | /** |
239 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its | |
240 | * reference count | |
241 | * @fsp: The FCP packet to be unlocked and decremented | |
242 | */ | |
42e9a92f RL |
243 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
244 | { | |
245 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
246 | fc_fcp_pkt_release(fsp); | |
247 | } | |
248 | ||
3a3b42bf RL |
249 | /** |
250 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt | |
251 | * @fsp: The FCP packet to start a timer for | |
f2817ec2 | 252 | * @delay: The timeout period in jiffies |
3a3b42bf | 253 | */ |
42e9a92f RL |
254 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
255 | { | |
256 | if (!(fsp->state & FC_SRB_COMPL)) | |
257 | mod_timer(&fsp->timer, jiffies + delay); | |
258 | } | |
259 | ||
3a3b42bf RL |
260 | /** |
261 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a | |
262 | * fcp_pkt | |
263 | * @fsp: The FCP packet to abort exchanges on | |
264 | */ | |
42e9a92f RL |
265 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
266 | { | |
267 | if (!fsp->seq_ptr) | |
268 | return -EINVAL; | |
269 | ||
0f02a665 VD |
270 | per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++; |
271 | put_cpu(); | |
272 | ||
42e9a92f RL |
273 | fsp->state |= FC_SRB_ABORT_PENDING; |
274 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); | |
275 | } | |
276 | ||
3a3b42bf RL |
277 | /** |
278 | * fc_fcp_retry_cmd() - Retry a fcp_pkt | |
279 | * @fsp: The FCP packet to be retried | |
280 | * | |
281 | * Sets the status code to be FC_ERROR and then calls | |
282 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). | |
283 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. | |
284 | * The SCSI-ml will retry the command. | |
42e9a92f RL |
285 | */ |
286 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) | |
287 | { | |
288 | if (fsp->seq_ptr) { | |
289 | fsp->lp->tt.exch_done(fsp->seq_ptr); | |
290 | fsp->seq_ptr = NULL; | |
291 | } | |
292 | ||
293 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 294 | fsp->io_status = 0; |
42e9a92f RL |
295 | fsp->status_code = FC_ERROR; |
296 | fc_fcp_complete_locked(fsp); | |
297 | } | |
298 | ||
3a3b42bf RL |
299 | /** |
300 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context | |
301 | * @fsp: The FCP packet that will manage the DDP frames | |
302 | * @xid: The XID that will be used for the DDP exchange | |
b277d2aa YZ |
303 | */ |
304 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
305 | { | |
3a3b42bf | 306 | struct fc_lport *lport; |
b277d2aa | 307 | |
3a3b42bf | 308 | lport = fsp->lp; |
b277d2aa | 309 | if ((fsp->req_flags & FC_SRB_READ) && |
3a3b42bf RL |
310 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
311 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), | |
312 | scsi_sg_count(fsp->cmd))) | |
b277d2aa YZ |
313 | fsp->xfer_ddp = xid; |
314 | } | |
315 | } | |
b277d2aa | 316 | |
3a3b42bf RL |
317 | /** |
318 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any | |
319 | * DDP related resources for a fcp_pkt | |
320 | * @fsp: The FCP packet that DDP had been used on | |
b277d2aa | 321 | */ |
6a716a85 | 322 | void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) |
b277d2aa | 323 | { |
3a3b42bf | 324 | struct fc_lport *lport; |
b277d2aa YZ |
325 | |
326 | if (!fsp) | |
327 | return; | |
328 | ||
5e472d07 YZ |
329 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
330 | return; | |
331 | ||
3a3b42bf RL |
332 | lport = fsp->lp; |
333 | if (lport->tt.ddp_done) { | |
334 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); | |
5e472d07 | 335 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
336 | } |
337 | } | |
338 | ||
84c3e1ad VD |
339 | /** |
340 | * fc_fcp_can_queue_ramp_up() - increases can_queue | |
341 | * @lport: lport to ramp up can_queue | |
84c3e1ad VD |
342 | */ |
343 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) | |
344 | { | |
345 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
9c8cce8e | 346 | unsigned long flags; |
84c3e1ad VD |
347 | int can_queue; |
348 | ||
9c8cce8e RL |
349 | spin_lock_irqsave(lport->host->host_lock, flags); |
350 | ||
84c3e1ad VD |
351 | if (si->last_can_queue_ramp_up_time && |
352 | (time_before(jiffies, si->last_can_queue_ramp_up_time + | |
353 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 354 | goto unlock; |
84c3e1ad VD |
355 | |
356 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
357 | FC_CAN_QUEUE_PERIOD)) | |
9c8cce8e | 358 | goto unlock; |
84c3e1ad VD |
359 | |
360 | si->last_can_queue_ramp_up_time = jiffies; | |
361 | ||
362 | can_queue = lport->host->can_queue << 1; | |
363 | if (can_queue >= si->max_can_queue) { | |
364 | can_queue = si->max_can_queue; | |
365 | si->last_can_queue_ramp_down_time = 0; | |
366 | } | |
367 | lport->host->can_queue = can_queue; | |
368 | shost_printk(KERN_ERR, lport->host, "libfc: increased " | |
369 | "can_queue to %d.\n", can_queue); | |
9c8cce8e RL |
370 | |
371 | unlock: | |
372 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
84c3e1ad VD |
373 | } |
374 | ||
c46be11a VD |
375 | /** |
376 | * fc_fcp_can_queue_ramp_down() - reduces can_queue | |
377 | * @lport: lport to reduce can_queue | |
378 | * | |
379 | * If we are getting memory allocation failures, then we may | |
380 | * be trying to execute too many commands. We let the running | |
381 | * commands complete or timeout, then try again with a reduced | |
382 | * can_queue. Eventually we will hit the point where we run | |
383 | * on all reserved structs. | |
384 | */ | |
385 | static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) | |
386 | { | |
387 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
9c8cce8e | 388 | unsigned long flags; |
c46be11a VD |
389 | int can_queue; |
390 | ||
9c8cce8e RL |
391 | spin_lock_irqsave(lport->host->host_lock, flags); |
392 | ||
84c3e1ad VD |
393 | if (si->last_can_queue_ramp_down_time && |
394 | (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
395 | FC_CAN_QUEUE_PERIOD))) | |
9c8cce8e | 396 | goto unlock; |
84c3e1ad VD |
397 | |
398 | si->last_can_queue_ramp_down_time = jiffies; | |
c46be11a VD |
399 | |
400 | can_queue = lport->host->can_queue; | |
401 | can_queue >>= 1; | |
402 | if (!can_queue) | |
403 | can_queue = 1; | |
404 | lport->host->can_queue = can_queue; | |
405 | shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" | |
406 | "Reducing can_queue to %d.\n", can_queue); | |
9c8cce8e RL |
407 | |
408 | unlock: | |
409 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
c46be11a VD |
410 | } |
411 | ||
412 | /* | |
413 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. | |
414 | * @lport: fc lport struct | |
415 | * @len: payload length | |
416 | * | |
417 | * Allocates fc_frame structure and buffer but if fails to allocate | |
418 | * then reduce can_queue. | |
419 | */ | |
420 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, | |
421 | size_t len) | |
422 | { | |
423 | struct fc_frame *fp; | |
424 | ||
425 | fp = fc_frame_alloc(lport, len); | |
c1ecb90a CL |
426 | if (likely(fp)) |
427 | return fp; | |
428 | ||
0f02a665 VD |
429 | per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++; |
430 | put_cpu(); | |
c1ecb90a | 431 | /* error case */ |
c1ecb90a | 432 | fc_fcp_can_queue_ramp_down(lport); |
c1ecb90a | 433 | return NULL; |
c46be11a VD |
434 | } |
435 | ||
3a3b42bf RL |
436 | /** |
437 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
438 | * @fsp: The FCP packet the data is on | |
439 | * @fp: The data frame | |
42e9a92f RL |
440 | */ |
441 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
442 | { | |
443 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 444 | struct fc_lport *lport = fsp->lp; |
1bd49b48 | 445 | struct fc_stats *stats; |
42e9a92f RL |
446 | struct fc_frame_header *fh; |
447 | size_t start_offset; | |
448 | size_t offset; | |
449 | u32 crc; | |
450 | u32 copy_len = 0; | |
451 | size_t len; | |
452 | void *buf; | |
453 | struct scatterlist *sg; | |
58682874 | 454 | u32 nents; |
ac17ea8d | 455 | u8 host_bcode = FC_COMPLETE; |
42e9a92f RL |
456 | |
457 | fh = fc_frame_header_get(fp); | |
458 | offset = ntohl(fh->fh_parm_offset); | |
459 | start_offset = offset; | |
460 | len = fr_len(fp) - sizeof(*fh); | |
461 | buf = fc_frame_payload_get(fp, 0); | |
462 | ||
5c12c418 | 463 | /* |
ac17ea8d | 464 | * if this I/O is ddped then clear it and initiate recovery since data |
465 | * frames are expected to be placed directly in that case. | |
466 | * | |
467 | * Indicate error to scsi-ml because something went wrong with the | |
468 | * ddp handling to get us here. | |
5c12c418 VD |
469 | */ |
470 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { | |
471 | fc_fcp_ddp_done(fsp); | |
ac17ea8d | 472 | FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); |
473 | host_bcode = FC_ERROR; | |
5c12c418 VD |
474 | goto err; |
475 | } | |
42e9a92f | 476 | if (offset + len > fsp->data_len) { |
34f42a07 | 477 | /* this should never happen */ |
42e9a92f RL |
478 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
479 | fc_frame_crc_check(fp)) | |
480 | goto crc_err; | |
7414705e RL |
481 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
482 | "data_len %x\n", len, offset, fsp->data_len); | |
ac17ea8d | 483 | |
484 | /* Data is corrupted indicate scsi-ml should retry */ | |
485 | host_bcode = FC_DATA_OVRRUN; | |
5c12c418 | 486 | goto err; |
42e9a92f RL |
487 | } |
488 | if (offset != fsp->xfer_len) | |
489 | fsp->state |= FC_SRB_DISCONTIG; | |
490 | ||
42e9a92f | 491 | sg = scsi_sglist(sc); |
58682874 | 492 | nents = scsi_sg_count(sc); |
42e9a92f | 493 | |
58682874 RL |
494 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
495 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 496 | &offset, NULL); |
58682874 RL |
497 | } else { |
498 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
499 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
77dfce07 | 500 | &offset, &crc); |
42e9a92f | 501 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 502 | if (len % 4) |
42e9a92f | 503 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
504 | |
505 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
506 | crc_err: | |
1bd49b48 | 507 | stats = per_cpu_ptr(lport->stats, get_cpu()); |
42e9a92f | 508 | stats->ErrorFrames++; |
f018b73a | 509 | /* per cpu count, not total count, but OK for limit */ |
688fd364 | 510 | if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) |
7414705e | 511 | printk(KERN_WARNING "libfc: CRC error on data " |
ce8b5df0 | 512 | "frame for port (%6.6x)\n", |
7b2787ec | 513 | lport->port_id); |
f018b73a | 514 | put_cpu(); |
42e9a92f RL |
515 | /* |
516 | * Assume the frame is total garbage. | |
517 | * We may have copied it over the good part | |
518 | * of the buffer. | |
519 | * If so, we need to retry the entire operation. | |
520 | * Otherwise, ignore it. | |
521 | */ | |
ac17ea8d | 522 | if (fsp->state & FC_SRB_DISCONTIG) { |
523 | host_bcode = FC_CRC_ERROR; | |
5c12c418 | 524 | goto err; |
ac17ea8d | 525 | } |
42e9a92f RL |
526 | return; |
527 | } | |
528 | } | |
529 | ||
530 | if (fsp->xfer_contig_end == start_offset) | |
531 | fsp->xfer_contig_end += copy_len; | |
532 | fsp->xfer_len += copy_len; | |
533 | ||
534 | /* | |
535 | * In the very rare event that this data arrived after the response | |
536 | * and completes the transfer, call the completion handler. | |
537 | */ | |
538 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
539 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
540 | fc_fcp_complete_locked(fsp); | |
5c12c418 VD |
541 | return; |
542 | err: | |
ac17ea8d | 543 | fc_fcp_recovery(fsp, host_bcode); |
42e9a92f RL |
544 | } |
545 | ||
34f42a07 | 546 | /** |
3a3b42bf RL |
547 | * fc_fcp_send_data() - Send SCSI data to a target |
548 | * @fsp: The FCP packet the data is on | |
549 | * @sp: The sequence the data is to be sent on | |
550 | * @offset: The starting offset for this data request | |
551 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
552 | * |
553 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf | 554 | * If the LLD is capable of sequence offload then send down the |
9ddc5b6f | 555 | * seq_blen amount of data in single frame, otherwise send |
3a3b42bf RL |
556 | * multiple frames of the maximum frame payload supported by |
557 | * the target port. | |
42e9a92f RL |
558 | */ |
559 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
560 | size_t offset, size_t seq_blen) | |
561 | { | |
562 | struct fc_exch *ep; | |
563 | struct scsi_cmnd *sc; | |
564 | struct scatterlist *sg; | |
565 | struct fc_frame *fp = NULL; | |
3a3b42bf | 566 | struct fc_lport *lport = fsp->lp; |
18fa11ef | 567 | struct page *page; |
42e9a92f RL |
568 | size_t remaining; |
569 | size_t t_blen; | |
570 | size_t tlen; | |
571 | size_t sg_bytes; | |
572 | size_t frame_offset, fh_parm_offset; | |
18fa11ef | 573 | size_t off; |
42e9a92f RL |
574 | int error; |
575 | void *data = NULL; | |
576 | void *page_addr; | |
3a3b42bf | 577 | int using_sg = lport->sg_supp; |
42e9a92f RL |
578 | u32 f_ctl; |
579 | ||
580 | WARN_ON(seq_blen <= 0); | |
581 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
582 | /* this should never happen */ | |
7414705e RL |
583 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
584 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
585 | fc_fcp_send_abort(fsp); |
586 | return 0; | |
587 | } else if (offset != fsp->xfer_len) { | |
588 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
589 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
590 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
591 | } |
592 | ||
593 | /* | |
594 | * if LLD is capable of seq_offload then set transport | |
595 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
596 | * to max FC frame payload previously set in fsp->max_payload. | |
597 | */ | |
276d6814 | 598 | t_blen = fsp->max_payload; |
3a3b42bf RL |
599 | if (lport->seq_offload) { |
600 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 601 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 602 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
603 | } |
604 | ||
42e9a92f RL |
605 | if (t_blen > 512) |
606 | t_blen &= ~(512 - 1); /* round down to block size */ | |
42e9a92f RL |
607 | sc = fsp->cmd; |
608 | ||
609 | remaining = seq_blen; | |
610 | fh_parm_offset = frame_offset = offset; | |
611 | tlen = 0; | |
3a3b42bf | 612 | seq = lport->tt.seq_start_next(seq); |
42e9a92f RL |
613 | f_ctl = FC_FC_REL_OFF; |
614 | WARN_ON(!seq); | |
615 | ||
42e9a92f RL |
616 | sg = scsi_sglist(sc); |
617 | ||
618 | while (remaining > 0 && sg) { | |
619 | if (offset >= sg->length) { | |
620 | offset -= sg->length; | |
621 | sg = sg_next(sg); | |
622 | continue; | |
623 | } | |
624 | if (!fp) { | |
625 | tlen = min(t_blen, remaining); | |
626 | ||
627 | /* | |
628 | * TODO. Temporary workaround. fc_seq_send() can't | |
629 | * handle odd lengths in non-linear skbs. | |
630 | * This will be the final fragment only. | |
631 | */ | |
632 | if (tlen % 4) | |
633 | using_sg = 0; | |
a7bbc7f4 VD |
634 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
635 | if (!fp) | |
636 | return -ENOMEM; | |
637 | ||
638 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
639 | fh_parm_offset = frame_offset; |
640 | fr_max_payload(fp) = fsp->max_payload; | |
641 | } | |
18fa11ef CL |
642 | |
643 | off = offset + sg->offset; | |
42e9a92f | 644 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
645 | sg_bytes = min(sg_bytes, |
646 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
647 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 648 | if (using_sg) { |
18fa11ef | 649 | get_page(page); |
42e9a92f RL |
650 | skb_fill_page_desc(fp_skb(fp), |
651 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 652 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
653 | fp_skb(fp)->data_len += sg_bytes; |
654 | fr_len(fp) += sg_bytes; | |
655 | fp_skb(fp)->truesize += PAGE_SIZE; | |
656 | } else { | |
42e9a92f RL |
657 | /* |
658 | * The scatterlist item may be bigger than PAGE_SIZE, | |
659 | * but we must not cross pages inside the kmap. | |
660 | */ | |
77dfce07 | 661 | page_addr = kmap_atomic(page); |
42e9a92f RL |
662 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
663 | sg_bytes); | |
77dfce07 | 664 | kunmap_atomic(page_addr); |
42e9a92f RL |
665 | data += sg_bytes; |
666 | } | |
667 | offset += sg_bytes; | |
668 | frame_offset += sg_bytes; | |
669 | tlen -= sg_bytes; | |
670 | remaining -= sg_bytes; | |
671 | ||
d37322a4 YZ |
672 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
673 | (tlen)) | |
42e9a92f RL |
674 | continue; |
675 | ||
676 | /* | |
677 | * Send sequence with transfer sequence initiative in case | |
678 | * this is last FCP frame of the sequence. | |
679 | */ | |
680 | if (remaining == 0) | |
681 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
682 | ||
683 | ep = fc_seq_exch(seq); | |
684 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
685 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
686 | ||
687 | /* | |
688 | * send fragment using for a sequence. | |
689 | */ | |
3a3b42bf | 690 | error = lport->tt.seq_send(lport, seq, fp); |
42e9a92f RL |
691 | if (error) { |
692 | WARN_ON(1); /* send error should be rare */ | |
8467b96c | 693 | return error; |
42e9a92f RL |
694 | } |
695 | fp = NULL; | |
696 | } | |
697 | fsp->xfer_len += seq_blen; /* premature count? */ | |
698 | return 0; | |
699 | } | |
700 | ||
3a3b42bf | 701 | /** |
547fb12b | 702 | * fc_fcp_abts_resp() - Receive an ABTS response |
3a3b42bf RL |
703 | * @fsp: The FCP packet that is being aborted |
704 | * @fp: The response frame | |
705 | */ | |
42e9a92f RL |
706 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
707 | { | |
708 | int ba_done = 1; | |
709 | struct fc_ba_rjt *brp; | |
710 | struct fc_frame_header *fh; | |
711 | ||
712 | fh = fc_frame_header_get(fp); | |
713 | switch (fh->fh_r_ctl) { | |
714 | case FC_RCTL_BA_ACC: | |
715 | break; | |
716 | case FC_RCTL_BA_RJT: | |
717 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
718 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
719 | break; | |
720 | /* fall thru */ | |
721 | default: | |
722 | /* | |
723 | * we will let the command timeout | |
724 | * and scsi-ml recover in this case, | |
725 | * therefore cleared the ba_done flag. | |
726 | */ | |
727 | ba_done = 0; | |
728 | } | |
729 | ||
730 | if (ba_done) { | |
731 | fsp->state |= FC_SRB_ABORTED; | |
732 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
733 | ||
734 | if (fsp->wait_for_comp) | |
735 | complete(&fsp->tm_done); | |
736 | else | |
737 | fc_fcp_complete_locked(fsp); | |
738 | } | |
739 | } | |
740 | ||
34f42a07 | 741 | /** |
547fb12b | 742 | * fc_fcp_recv() - Receive an FCP frame |
34f42a07 | 743 | * @seq: The sequence the frame is on |
3a3b42bf | 744 | * @fp: The received frame |
34f42a07 | 745 | * @arg: The related FCP packet |
42e9a92f | 746 | * |
3a3b42bf RL |
747 | * Context: Called from Soft IRQ context. Can not be called |
748 | * holding the FCP packet list lock. | |
42e9a92f RL |
749 | */ |
750 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
751 | { | |
752 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 753 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
754 | struct fc_frame_header *fh; |
755 | struct fcp_txrdy *dd; | |
756 | u8 r_ctl; | |
757 | int rc = 0; | |
758 | ||
c46be11a VD |
759 | if (IS_ERR(fp)) { |
760 | fc_fcp_error(fsp, fp); | |
761 | return; | |
762 | } | |
42e9a92f RL |
763 | |
764 | fh = fc_frame_header_get(fp); | |
765 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 766 | |
1c4bfe63 | 767 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
768 | goto out; |
769 | if (fc_fcp_lock_pkt(fsp)) | |
770 | goto out; | |
42e9a92f RL |
771 | |
772 | if (fh->fh_type == FC_TYPE_BLS) { | |
773 | fc_fcp_abts_resp(fsp, fp); | |
774 | goto unlock; | |
775 | } | |
776 | ||
777 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
778 | goto unlock; | |
779 | ||
780 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
781 | /* | |
782 | * received XFER RDY from the target | |
783 | * need to send data to the target | |
784 | */ | |
785 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
786 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
787 | WARN_ON(!dd); | |
788 | ||
789 | rc = fc_fcp_send_data(fsp, seq, | |
790 | (size_t) ntohl(dd->ft_data_ro), | |
791 | (size_t) ntohl(dd->ft_burst_len)); | |
792 | if (!rc) | |
793 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
794 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
795 | /* | |
796 | * received a DATA frame | |
797 | * next we will copy the data to the system buffer | |
798 | */ | |
799 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
800 | fc_fcp_recv_data(fsp, fp); | |
801 | seq->rec_data = fsp->xfer_contig_end; | |
802 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
803 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
804 | ||
805 | fc_fcp_resp(fsp, fp); | |
806 | } else { | |
7414705e | 807 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
808 | } |
809 | unlock: | |
810 | fc_fcp_unlock_pkt(fsp); | |
811 | out: | |
812 | fc_frame_free(fp); | |
42e9a92f RL |
813 | } |
814 | ||
3a3b42bf RL |
815 | /** |
816 | * fc_fcp_resp() - Handler for FCP responses | |
817 | * @fsp: The FCP packet the response is for | |
818 | * @fp: The response frame | |
819 | */ | |
42e9a92f RL |
820 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
821 | { | |
822 | struct fc_frame_header *fh; | |
823 | struct fcp_resp *fc_rp; | |
824 | struct fcp_resp_ext *rp_ex; | |
825 | struct fcp_resp_rsp_info *fc_rp_info; | |
826 | u32 plen; | |
827 | u32 expected_len; | |
828 | u32 respl = 0; | |
829 | u32 snsl = 0; | |
830 | u8 flags = 0; | |
831 | ||
832 | plen = fr_len(fp); | |
833 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
834 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
835 | goto len_err; | |
836 | plen -= sizeof(*fh); | |
837 | fc_rp = (struct fcp_resp *)(fh + 1); | |
838 | fsp->cdb_status = fc_rp->fr_status; | |
839 | flags = fc_rp->fr_flags; | |
840 | fsp->scsi_comp_flags = flags; | |
841 | expected_len = fsp->data_len; | |
842 | ||
b277d2aa YZ |
843 | /* if ddp, update xfer len */ |
844 | fc_fcp_ddp_done(fsp); | |
845 | ||
42e9a92f RL |
846 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
847 | rp_ex = (void *)(fc_rp + 1); | |
848 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
849 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
850 | goto len_err; | |
851 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
852 | if (flags & FCP_RSP_LEN_VAL) { | |
853 | respl = ntohl(rp_ex->fr_rsp_len); | |
3b64b188 YZ |
854 | if ((respl != FCP_RESP_RSP_INFO_LEN4) && |
855 | (respl != FCP_RESP_RSP_INFO_LEN8)) | |
42e9a92f RL |
856 | goto len_err; |
857 | if (fsp->wait_for_comp) { | |
858 | /* Abuse cdb_status for rsp code */ | |
859 | fsp->cdb_status = fc_rp_info->rsp_code; | |
860 | complete(&fsp->tm_done); | |
861 | /* | |
862 | * tmfs will not have any scsi cmd so | |
863 | * exit here | |
864 | */ | |
865 | return; | |
63ac4bbf | 866 | } |
42e9a92f RL |
867 | } |
868 | if (flags & FCP_SNS_LEN_VAL) { | |
869 | snsl = ntohl(rp_ex->fr_sns_len); | |
870 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
871 | snsl = SCSI_SENSE_BUFFERSIZE; | |
872 | memcpy(fsp->cmd->sense_buffer, | |
873 | (char *)fc_rp_info + respl, snsl); | |
874 | } | |
875 | } | |
876 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
877 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
878 | goto len_err; | |
879 | if (flags & FCP_RESID_UNDER) { | |
880 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
881 | /* | |
882 | * The cmnd->underflow is the minimum number of | |
25985edc | 883 | * bytes that must be transferred for this |
42e9a92f RL |
884 | * command. Provided a sense condition is not |
885 | * present, make sure the actual amount | |
886 | * transferred is at least the underflow value | |
887 | * or fail. | |
888 | */ | |
889 | if (!(flags & FCP_SNS_LEN_VAL) && | |
890 | (fc_rp->fr_status == 0) && | |
891 | (scsi_bufflen(fsp->cmd) - | |
892 | fsp->scsi_resid) < fsp->cmd->underflow) | |
893 | goto err; | |
894 | expected_len -= fsp->scsi_resid; | |
895 | } else { | |
896 | fsp->status_code = FC_ERROR; | |
897 | } | |
898 | } | |
899 | } | |
900 | fsp->state |= FC_SRB_RCV_STATUS; | |
901 | ||
902 | /* | |
903 | * Check for missing or extra data frames. | |
904 | */ | |
905 | if (unlikely(fsp->xfer_len != expected_len)) { | |
906 | if (fsp->xfer_len < expected_len) { | |
907 | /* | |
908 | * Some data may be queued locally, | |
909 | * Wait a at least one jiffy to see if it is delivered. | |
910 | * If this expires without data, we may do SRR. | |
911 | */ | |
912 | fc_fcp_timer_set(fsp, 2); | |
913 | return; | |
914 | } | |
915 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 916 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
917 | "len %x, data len %x\n", |
918 | fsp->rport->port_id, | |
919 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
920 | } |
921 | fc_fcp_complete_locked(fsp); | |
922 | return; | |
923 | ||
924 | len_err: | |
7414705e RL |
925 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
926 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
927 | err: |
928 | fsp->status_code = FC_ERROR; | |
929 | fc_fcp_complete_locked(fsp); | |
930 | } | |
931 | ||
932 | /** | |
3a3b42bf RL |
933 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
934 | * fcp_pkt lock held | |
935 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
936 | * |
937 | * This function may sleep if a timer is pending. The packet lock must be | |
938 | * held, and the host lock must not be held. | |
939 | */ | |
940 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
941 | { | |
3a3b42bf | 942 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
943 | struct fc_seq *seq; |
944 | struct fc_exch *ep; | |
945 | u32 f_ctl; | |
946 | ||
947 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
948 | return; | |
949 | ||
950 | if (fsp->state & FC_SRB_ABORTED) { | |
951 | if (!fsp->status_code) | |
952 | fsp->status_code = FC_CMD_ABORTED; | |
953 | } else { | |
954 | /* | |
955 | * Test for transport underrun, independent of response | |
956 | * underrun status. | |
957 | */ | |
958 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
959 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
960 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
961 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 962 | fsp->io_status = 0; |
42e9a92f RL |
963 | } |
964 | } | |
965 | ||
966 | seq = fsp->seq_ptr; | |
967 | if (seq) { | |
968 | fsp->seq_ptr = NULL; | |
969 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
970 | struct fc_frame *conf_frame; | |
971 | struct fc_seq *csp; | |
972 | ||
3a3b42bf | 973 | csp = lport->tt.seq_start_next(seq); |
c46be11a | 974 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
975 | if (conf_frame) { |
976 | f_ctl = FC_FC_SEQ_INIT; | |
977 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
978 | ep = fc_seq_exch(seq); | |
979 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
980 | ep->did, ep->sid, | |
981 | FC_TYPE_FCP, f_ctl, 0); | |
3a3b42bf | 982 | lport->tt.seq_send(lport, csp, conf_frame); |
42e9a92f RL |
983 | } |
984 | } | |
3a3b42bf | 985 | lport->tt.exch_done(seq); |
42e9a92f | 986 | } |
d889b30a YZ |
987 | /* |
988 | * Some resets driven by SCSI are not I/Os and do not have | |
989 | * SCSI commands associated with the requests. We should not | |
990 | * call I/O completion if we do not have a SCSI command. | |
991 | */ | |
992 | if (fsp->cmd) | |
993 | fc_io_compl(fsp); | |
42e9a92f RL |
994 | } |
995 | ||
3a3b42bf RL |
996 | /** |
997 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
998 | * @fsp: The FCP packet whose exchanges should be canceled | |
999 | * @error: The reason for the cancellation | |
1000 | */ | |
42e9a92f RL |
1001 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
1002 | { | |
3a3b42bf | 1003 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
1004 | |
1005 | if (fsp->seq_ptr) { | |
3a3b42bf | 1006 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1007 | fsp->seq_ptr = NULL; |
1008 | } | |
1009 | fsp->status_code = error; | |
1010 | } | |
1011 | ||
1012 | /** | |
3a3b42bf RL |
1013 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
1014 | * @lport: The local port whose exchanges should be canceled | |
1015 | * @id: The target's ID | |
1016 | * @lun: The LUN | |
1017 | * @error: The reason for cancellation | |
42e9a92f RL |
1018 | * |
1019 | * If lun or id is -1, they are ignored. | |
1020 | */ | |
3a3b42bf | 1021 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
1022 | unsigned int lun, int error) |
1023 | { | |
3a3b42bf | 1024 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
1025 | struct fc_fcp_pkt *fsp; |
1026 | struct scsi_cmnd *sc_cmd; | |
1027 | unsigned long flags; | |
1028 | ||
c1ecb90a | 1029 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1030 | restart: |
1031 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1032 | sc_cmd = fsp->cmd; | |
1033 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1034 | continue; | |
1035 | ||
1036 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1037 | continue; | |
1038 | ||
1039 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1040 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1041 | |
1042 | if (!fc_fcp_lock_pkt(fsp)) { | |
1043 | fc_fcp_cleanup_cmd(fsp, error); | |
1044 | fc_io_compl(fsp); | |
1045 | fc_fcp_unlock_pkt(fsp); | |
1046 | } | |
1047 | ||
1048 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1049 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1050 | /* |
1051 | * while we dropped the lock multiple pkts could | |
1052 | * have been released, so we have to start over. | |
1053 | */ | |
1054 | goto restart; | |
1055 | } | |
c1ecb90a | 1056 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1057 | } |
1058 | ||
3a3b42bf RL |
1059 | /** |
1060 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1061 | * @lport: The local port whose exchanges are to be aborted | |
1062 | */ | |
1063 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1064 | { |
3a3b42bf | 1065 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1066 | } |
1067 | ||
1068 | /** | |
3a3b42bf RL |
1069 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1070 | * @lport: The local port to send the FCP packet on | |
1071 | * @fsp: The FCP packet to send | |
42e9a92f | 1072 | * |
3a3b42bf | 1073 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1074 | * Locks: Called without locks held |
42e9a92f | 1075 | */ |
3a3b42bf | 1076 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1077 | { |
3a3b42bf | 1078 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1079 | unsigned long flags; |
42e9a92f RL |
1080 | int rc; |
1081 | ||
1082 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1083 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1084 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1085 | ||
e35fa8c2 | 1086 | int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); |
42e9a92f | 1087 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); |
42e9a92f | 1088 | |
c1ecb90a CL |
1089 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1090 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1091 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1092 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1093 | if (unlikely(rc)) { |
1094 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
c9d24a76 | 1095 | fsp->cmd->SCp.ptr = NULL; |
42e9a92f | 1096 | list_del(&fsp->list); |
c1ecb90a CL |
1097 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1098 | } | |
42e9a92f RL |
1099 | |
1100 | return rc; | |
1101 | } | |
1102 | ||
e0883a3c | 1103 | /** |
1104 | * get_fsp_rec_tov() - Helper function to get REC_TOV | |
1105 | * @fsp: the FCP packet | |
f2817ec2 VD |
1106 | * |
1107 | * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second | |
e0883a3c | 1108 | */ |
1109 | static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) | |
1110 | { | |
f2817ec2 | 1111 | struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; |
e0883a3c | 1112 | |
f2817ec2 | 1113 | return msecs_to_jiffies(rpriv->e_d_tov) + HZ; |
e0883a3c | 1114 | } |
1115 | ||
3a3b42bf RL |
1116 | /** |
1117 | * fc_fcp_cmd_send() - Send a FCP command | |
1118 | * @lport: The local port to send the command on | |
1119 | * @fsp: The FCP packet the command is on | |
1120 | * @resp: The handler for the response | |
1121 | */ | |
1122 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1123 | void (*resp)(struct fc_seq *, |
1124 | struct fc_frame *fp, | |
1125 | void *arg)) | |
1126 | { | |
1127 | struct fc_frame *fp; | |
1128 | struct fc_seq *seq; | |
1129 | struct fc_rport *rport; | |
3a3b42bf | 1130 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1131 | const size_t len = sizeof(fsp->cdb_cmd); |
1132 | int rc = 0; | |
1133 | ||
1134 | if (fc_fcp_lock_pkt(fsp)) | |
1135 | return 0; | |
1136 | ||
c46be11a | 1137 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1138 | if (!fp) { |
1139 | rc = -1; | |
1140 | goto unlock; | |
1141 | } | |
1142 | ||
1143 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1144 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1145 | rport = fsp->rport; |
1146 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1147 | rpriv = rport->dd_data; |
42e9a92f RL |
1148 | |
1149 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
7b2787ec | 1150 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1151 | FC_FCTL_REQ, 0); |
42e9a92f | 1152 | |
3a3b42bf RL |
1153 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
1154 | fsp, 0); | |
42e9a92f | 1155 | if (!seq) { |
42e9a92f RL |
1156 | rc = -1; |
1157 | goto unlock; | |
1158 | } | |
42e9a92f RL |
1159 | fsp->seq_ptr = seq; |
1160 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1161 | ||
1162 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); | |
05fee645 | 1163 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
f2817ec2 | 1164 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
05fee645 | 1165 | |
42e9a92f RL |
1166 | unlock: |
1167 | fc_fcp_unlock_pkt(fsp); | |
1168 | return rc; | |
1169 | } | |
1170 | ||
3a3b42bf RL |
1171 | /** |
1172 | * fc_fcp_error() - Handler for FCP layer errors | |
1173 | * @fsp: The FCP packet the error is on | |
1174 | * @fp: The frame that has errored | |
42e9a92f RL |
1175 | */ |
1176 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1177 | { | |
1178 | int error = PTR_ERR(fp); | |
1179 | ||
1180 | if (fc_fcp_lock_pkt(fsp)) | |
1181 | return; | |
1182 | ||
7414705e | 1183 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1184 | fc_fcp_retry_cmd(fsp); |
1185 | goto unlock; | |
42e9a92f | 1186 | } |
7414705e | 1187 | |
42e9a92f RL |
1188 | /* |
1189 | * clear abort pending, because the lower layer | |
1190 | * decided to force completion. | |
1191 | */ | |
1192 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1193 | fsp->status_code = FC_CMD_PLOGO; | |
1194 | fc_fcp_complete_locked(fsp); | |
1195 | unlock: | |
1196 | fc_fcp_unlock_pkt(fsp); | |
1197 | } | |
1198 | ||
3a3b42bf RL |
1199 | /** |
1200 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1201 | * @fsp: The FCP packet to abort on | |
1202 | * | |
1203 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1204 | */ |
c340111d | 1205 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1206 | { |
1207 | int rc = FAILED; | |
fa79dbdb | 1208 | unsigned long ticks_left; |
42e9a92f RL |
1209 | |
1210 | if (fc_fcp_send_abort(fsp)) | |
1211 | return FAILED; | |
1212 | ||
1213 | init_completion(&fsp->tm_done); | |
1214 | fsp->wait_for_comp = 1; | |
1215 | ||
1216 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
fa79dbdb HD |
1217 | ticks_left = wait_for_completion_timeout(&fsp->tm_done, |
1218 | FC_SCSI_TM_TOV); | |
42e9a92f RL |
1219 | spin_lock_bh(&fsp->scsi_pkt_lock); |
1220 | fsp->wait_for_comp = 0; | |
1221 | ||
fa79dbdb | 1222 | if (!ticks_left) { |
7414705e | 1223 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f | 1224 | } else if (fsp->state & FC_SRB_ABORTED) { |
7414705e | 1225 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1226 | rc = SUCCESS; |
1227 | fc_fcp_complete_locked(fsp); | |
1228 | } | |
1229 | ||
1230 | return rc; | |
1231 | } | |
1232 | ||
3a3b42bf RL |
1233 | /** |
1234 | * fc_lun_reset_send() - Send LUN reset command | |
1235 | * @data: The FCP packet that identifies the LUN to be reset | |
42e9a92f RL |
1236 | */ |
1237 | static void fc_lun_reset_send(unsigned long data) | |
1238 | { | |
1239 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
3a3b42bf | 1240 | struct fc_lport *lport = fsp->lp; |
e0883a3c | 1241 | |
3a3b42bf | 1242 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { |
42e9a92f RL |
1243 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1244 | return; | |
1245 | if (fc_fcp_lock_pkt(fsp)) | |
1246 | return; | |
1247 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); | |
f2817ec2 | 1248 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1249 | fc_fcp_unlock_pkt(fsp); |
1250 | } | |
1251 | } | |
1252 | ||
3a3b42bf RL |
1253 | /** |
1254 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1255 | * and wait for the reply | |
b595076a | 1256 | * @lport: The local port to sent the command on |
3a3b42bf RL |
1257 | * @fsp: The FCP packet that identifies the LUN to be reset |
1258 | * @id: The SCSI command ID | |
1259 | * @lun: The LUN ID to be reset | |
42e9a92f | 1260 | */ |
3a3b42bf | 1261 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1262 | unsigned int id, unsigned int lun) |
1263 | { | |
1264 | int rc; | |
1265 | ||
1266 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1267 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
e35fa8c2 | 1268 | int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); |
42e9a92f RL |
1269 | |
1270 | fsp->wait_for_comp = 1; | |
1271 | init_completion(&fsp->tm_done); | |
1272 | ||
1273 | fc_lun_reset_send((unsigned long)fsp); | |
1274 | ||
1275 | /* | |
1276 | * wait for completion of reset | |
1277 | * after that make sure all commands are terminated | |
1278 | */ | |
1279 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1280 | ||
1281 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1282 | fsp->state |= FC_SRB_COMPL; | |
1283 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1284 | ||
1285 | del_timer_sync(&fsp->timer); | |
1286 | ||
1287 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1288 | if (fsp->seq_ptr) { | |
3a3b42bf | 1289 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1290 | fsp->seq_ptr = NULL; |
1291 | } | |
1292 | fsp->wait_for_comp = 0; | |
1293 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1294 | ||
1295 | if (!rc) { | |
3a3b42bf | 1296 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1297 | return FAILED; |
1298 | } | |
1299 | ||
1300 | /* cdb_status holds the tmf's rsp code */ | |
1301 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1302 | return FAILED; | |
1303 | ||
3a3b42bf RL |
1304 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1305 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1306 | return SUCCESS; |
1307 | } | |
1308 | ||
3a3b42bf | 1309 | /** |
25985edc | 1310 | * fc_tm_done() - Task Management response handler |
3a3b42bf RL |
1311 | * @seq: The sequence that the response is on |
1312 | * @fp: The response frame | |
1313 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1314 | */ |
1315 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1316 | { | |
1317 | struct fc_fcp_pkt *fsp = arg; | |
1318 | struct fc_frame_header *fh; | |
1319 | ||
1320 | if (IS_ERR(fp)) { | |
1321 | /* | |
1322 | * If there is an error just let it timeout or wait | |
1323 | * for TMF to be aborted if it timedout. | |
1324 | * | |
1325 | * scsi-eh will escalate for when either happens. | |
1326 | */ | |
e4a9a982 | 1327 | return; |
42e9a92f RL |
1328 | } |
1329 | ||
1330 | if (fc_fcp_lock_pkt(fsp)) | |
b5fe5e95 | 1331 | goto out; |
42e9a92f RL |
1332 | |
1333 | /* | |
1334 | * raced with eh timeout handler. | |
1335 | */ | |
b5fe5e95 YZ |
1336 | if (!fsp->seq_ptr || !fsp->wait_for_comp) |
1337 | goto out_unlock; | |
42e9a92f RL |
1338 | |
1339 | fh = fc_frame_header_get(fp); | |
1340 | if (fh->fh_type != FC_TYPE_BLS) | |
1341 | fc_fcp_resp(fsp, fp); | |
1342 | fsp->seq_ptr = NULL; | |
1343 | fsp->lp->tt.exch_done(seq); | |
b5fe5e95 | 1344 | out_unlock: |
42e9a92f | 1345 | fc_fcp_unlock_pkt(fsp); |
b5fe5e95 YZ |
1346 | out: |
1347 | fc_frame_free(fp); | |
42e9a92f RL |
1348 | } |
1349 | ||
3a3b42bf RL |
1350 | /** |
1351 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1352 | * @lport: The local port to be cleaned up | |
1353 | */ | |
1354 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1355 | { |
3a3b42bf | 1356 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1357 | } |
1358 | ||
3a3b42bf RL |
1359 | /** |
1360 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
1361 | * @data: The FCP packet that has timed out | |
42e9a92f | 1362 | * |
3a3b42bf RL |
1363 | * If REC is supported then just issue it and return. The REC exchange will |
1364 | * complete or time out and recovery can continue at that point. Otherwise, | |
1365 | * if the response has been received without all the data it has been | |
1366 | * ER_TIMEOUT since the response was received. If the response has not been | |
1367 | * received we see if data was received recently. If it has been then we | |
1368 | * continue waiting, otherwise, we abort the command. | |
42e9a92f RL |
1369 | */ |
1370 | static void fc_fcp_timeout(unsigned long data) | |
1371 | { | |
1372 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1373 | struct fc_rport *rport = fsp->rport; | |
3a3b42bf | 1374 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1375 | |
1376 | if (fc_fcp_lock_pkt(fsp)) | |
1377 | return; | |
1378 | ||
1379 | if (fsp->cdb_cmd.fc_tm_flags) | |
1380 | goto unlock; | |
1381 | ||
1382 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1383 | ||
5b97fabd | 1384 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
a752359f | 1385 | fc_fcp_rec(fsp); |
5b97fabd VD |
1386 | else if (fsp->state & FC_SRB_RCV_STATUS) |
1387 | fc_fcp_complete_locked(fsp); | |
42e9a92f | 1388 | else |
ac17ea8d | 1389 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1390 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1391 | unlock: | |
1392 | fc_fcp_unlock_pkt(fsp); | |
1393 | } | |
1394 | ||
3a3b42bf RL |
1395 | /** |
1396 | * fc_fcp_rec() - Send a REC ELS request | |
1397 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1398 | */ |
1399 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1400 | { | |
3a3b42bf | 1401 | struct fc_lport *lport; |
42e9a92f RL |
1402 | struct fc_frame *fp; |
1403 | struct fc_rport *rport; | |
3a3b42bf | 1404 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1405 | |
3a3b42bf | 1406 | lport = fsp->lp; |
42e9a92f | 1407 | rport = fsp->rport; |
3a3b42bf RL |
1408 | rpriv = rport->dd_data; |
1409 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1410 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1411 | fsp->io_status = 0; |
42e9a92f RL |
1412 | fc_fcp_complete_locked(fsp); |
1413 | return; | |
1414 | } | |
e0883a3c | 1415 | |
c46be11a | 1416 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1417 | if (!fp) |
1418 | goto retry; | |
1419 | ||
1420 | fr_seq(fp) = fsp->seq_ptr; | |
1421 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
7b2787ec | 1422 | rpriv->local_port->port_id, FC_TYPE_ELS, |
24f089e2 | 1423 | FC_FCTL_REQ, 0); |
3a3b42bf RL |
1424 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1425 | fc_fcp_rec_resp, fsp, | |
3a91090f | 1426 | 2 * lport->r_a_tov)) { |
42e9a92f RL |
1427 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1428 | return; | |
1429 | } | |
42e9a92f RL |
1430 | retry: |
1431 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
3a91090f | 1432 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f | 1433 | else |
ac17ea8d | 1434 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1435 | } |
1436 | ||
3a3b42bf RL |
1437 | /** |
1438 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1439 | * @seq: The sequence the response is on | |
1440 | * @fp: The response frame | |
1441 | * @arg: The FCP packet the response is on | |
1442 | * | |
1443 | * If the response is a reject then the scsi layer will handle | |
1444 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1445 | * set the timeout and return. If the I/O was completed then complete the | |
1446 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1447 | */ |
1448 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1449 | { | |
1450 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1451 | struct fc_els_rec_acc *recp; | |
1452 | struct fc_els_ls_rjt *rjt; | |
1453 | u32 e_stat; | |
1454 | u8 opcode; | |
1455 | u32 offset; | |
1456 | enum dma_data_direction data_dir; | |
1457 | enum fc_rctl r_ctl; | |
3a3b42bf | 1458 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1459 | |
1460 | if (IS_ERR(fp)) { | |
1461 | fc_fcp_rec_error(fsp, fp); | |
1462 | return; | |
1463 | } | |
1464 | ||
1465 | if (fc_fcp_lock_pkt(fsp)) | |
1466 | goto out; | |
1467 | ||
1468 | fsp->recov_retry = 0; | |
1469 | opcode = fc_frame_payload_op(fp); | |
1470 | if (opcode == ELS_LS_RJT) { | |
1471 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1472 | switch (rjt->er_reason) { | |
1473 | default: | |
7414705e RL |
1474 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1475 | "reason %d expl %d\n", | |
1476 | fsp->rport->port_id, rjt->er_reason, | |
1477 | rjt->er_explan); | |
42e9a92f RL |
1478 | /* fall through */ |
1479 | case ELS_RJT_UNSUP: | |
7414705e | 1480 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1481 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1482 | /* |
1483 | * if we do not spport RECs or got some bogus | |
1484 | * reason then resetup timer so we check for | |
1485 | * making progress. | |
1486 | */ | |
3a3b42bf | 1487 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1488 | break; |
1489 | case ELS_RJT_LOGIC: | |
1490 | case ELS_RJT_UNAB: | |
1491 | /* | |
1492 | * If no data transfer, the command frame got dropped | |
1493 | * so we just retry. If data was transferred, we | |
1494 | * lost the response but the target has no record, | |
1495 | * so we abort and retry. | |
1496 | */ | |
1497 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1498 | fsp->xfer_len == 0) { | |
1499 | fc_fcp_retry_cmd(fsp); | |
1500 | break; | |
1501 | } | |
ac17ea8d | 1502 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1503 | break; |
1504 | } | |
1505 | } else if (opcode == ELS_LS_ACC) { | |
1506 | if (fsp->state & FC_SRB_ABORTED) | |
1507 | goto unlock_out; | |
1508 | ||
1509 | data_dir = fsp->cmd->sc_data_direction; | |
1510 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1511 | offset = ntohl(recp->reca_fc4value); | |
1512 | e_stat = ntohl(recp->reca_e_stat); | |
1513 | ||
1514 | if (e_stat & ESB_ST_COMPLETE) { | |
1515 | ||
1516 | /* | |
1517 | * The exchange is complete. | |
1518 | * | |
1519 | * For output, we must've lost the response. | |
1520 | * For input, all data must've been sent. | |
1521 | * We lost may have lost the response | |
1522 | * (and a confirmation was requested) and maybe | |
1523 | * some data. | |
1524 | * | |
1525 | * If all data received, send SRR | |
1526 | * asking for response. If partial data received, | |
1527 | * or gaps, SRR requests data at start of gap. | |
1528 | * Recovery via SRR relies on in-order-delivery. | |
1529 | */ | |
1530 | if (data_dir == DMA_TO_DEVICE) { | |
1531 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1532 | } else if (fsp->xfer_contig_end == offset) { | |
1533 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1534 | } else { | |
1535 | offset = fsp->xfer_contig_end; | |
1536 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1537 | } | |
1538 | fc_fcp_srr(fsp, r_ctl, offset); | |
1539 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
42e9a92f RL |
1540 | /* |
1541 | * The remote port has the initiative, so just | |
1542 | * keep waiting for it to complete. | |
1543 | */ | |
f2817ec2 | 1544 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1545 | } else { |
1546 | ||
1547 | /* | |
1548 | * The exchange is incomplete, we have seq. initiative. | |
1549 | * Lost response with requested confirmation, | |
1550 | * lost confirmation, lost transfer ready or | |
1551 | * lost write data. | |
1552 | * | |
1553 | * For output, if not all data was received, ask | |
1554 | * for transfer ready to be repeated. | |
1555 | * | |
1556 | * If we received or sent all the data, send SRR to | |
1557 | * request response. | |
1558 | * | |
1559 | * If we lost a response, we may have lost some read | |
1560 | * data as well. | |
1561 | */ | |
1562 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1563 | if (data_dir == DMA_TO_DEVICE) { | |
1564 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1565 | if (offset < fsp->data_len) | |
1566 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1567 | } else if (offset == fsp->xfer_contig_end) { | |
1568 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1569 | } else if (fsp->xfer_contig_end < offset) { | |
1570 | offset = fsp->xfer_contig_end; | |
1571 | } | |
1572 | fc_fcp_srr(fsp, r_ctl, offset); | |
1573 | } | |
1574 | } | |
1575 | unlock_out: | |
1576 | fc_fcp_unlock_pkt(fsp); | |
1577 | out: | |
1578 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1579 | fc_frame_free(fp); | |
1580 | } | |
1581 | ||
3a3b42bf RL |
1582 | /** |
1583 | * fc_fcp_rec_error() - Handler for REC errors | |
1584 | * @fsp: The FCP packet the error is on | |
1585 | * @fp: The REC frame | |
42e9a92f RL |
1586 | */ |
1587 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1588 | { | |
1589 | int error = PTR_ERR(fp); | |
1590 | ||
1591 | if (fc_fcp_lock_pkt(fsp)) | |
1592 | goto out; | |
1593 | ||
1594 | switch (error) { | |
1595 | case -FC_EX_CLOSED: | |
1596 | fc_fcp_retry_cmd(fsp); | |
1597 | break; | |
1598 | ||
1599 | default: | |
ce8b5df0 | 1600 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1601 | fsp, fsp->rport->port_id, error); |
42e9a92f RL |
1602 | fsp->status_code = FC_CMD_PLOGO; |
1603 | /* fall through */ | |
1604 | ||
1605 | case -FC_EX_TIMEOUT: | |
1606 | /* | |
1607 | * Assume REC or LS_ACC was lost. | |
1608 | * The exchange manager will have aborted REC, so retry. | |
1609 | */ | |
ce8b5df0 | 1610 | FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", |
7414705e RL |
1611 | fsp->rport->port_id, error, fsp->recov_retry, |
1612 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1613 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1614 | fc_fcp_rec(fsp); | |
1615 | else | |
ac17ea8d | 1616 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1617 | break; |
1618 | } | |
1619 | fc_fcp_unlock_pkt(fsp); | |
1620 | out: | |
1621 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1622 | } | |
1623 | ||
3a3b42bf | 1624 | /** |
5c12c418 VD |
1625 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1626 | * @fsp: The FCP pkt that needs to be aborted | |
42e9a92f | 1627 | */ |
ac17ea8d | 1628 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) |
42e9a92f | 1629 | { |
ac17ea8d | 1630 | fsp->status_code = code; |
42e9a92f RL |
1631 | fsp->cdb_status = 0; |
1632 | fsp->io_status = 0; | |
1633 | /* | |
1634 | * if this fails then we let the scsi command timer fire and | |
1635 | * scsi-ml escalate. | |
1636 | */ | |
1637 | fc_fcp_send_abort(fsp); | |
1638 | } | |
1639 | ||
3a3b42bf RL |
1640 | /** |
1641 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1642 | * @fsp: The FCP packet the SRR is to be sent on | |
1643 | * @r_ctl: The R_CTL field for the SRR request | |
42e9a92f RL |
1644 | * This is called after receiving status but insufficient data, or |
1645 | * when expecting status but the request has timed out. | |
1646 | */ | |
1647 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1648 | { | |
3a3b42bf | 1649 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1650 | struct fc_rport *rport; |
3a3b42bf | 1651 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1652 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1653 | struct fc_seq *seq; | |
1654 | struct fcp_srr *srr; | |
1655 | struct fc_frame *fp; | |
e0883a3c | 1656 | unsigned int rec_tov; |
42e9a92f RL |
1657 | |
1658 | rport = fsp->rport; | |
3a3b42bf | 1659 | rpriv = rport->dd_data; |
42e9a92f | 1660 | |
3a3b42bf RL |
1661 | if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || |
1662 | rpriv->rp_state != RPORT_ST_READY) | |
42e9a92f | 1663 | goto retry; /* shouldn't happen */ |
c46be11a | 1664 | fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); |
42e9a92f RL |
1665 | if (!fp) |
1666 | goto retry; | |
1667 | ||
1668 | srr = fc_frame_payload_get(fp, sizeof(*srr)); | |
1669 | memset(srr, 0, sizeof(*srr)); | |
1670 | srr->srr_op = ELS_SRR; | |
1671 | srr->srr_ox_id = htons(ep->oxid); | |
1672 | srr->srr_rx_id = htons(ep->rxid); | |
1673 | srr->srr_r_ctl = r_ctl; | |
1674 | srr->srr_rel_off = htonl(offset); | |
1675 | ||
1676 | fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, | |
7b2787ec | 1677 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1678 | FC_FCTL_REQ, 0); |
42e9a92f | 1679 | |
e0883a3c | 1680 | rec_tov = get_fsp_rec_tov(fsp); |
0a219edb VD |
1681 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, |
1682 | fc_fcp_pkt_destroy, | |
e0883a3c | 1683 | fsp, jiffies_to_msecs(rec_tov)); |
8f550f93 | 1684 | if (!seq) |
42e9a92f | 1685 | goto retry; |
8f550f93 | 1686 | |
42e9a92f RL |
1687 | fsp->recov_seq = seq; |
1688 | fsp->xfer_len = offset; | |
1689 | fsp->xfer_contig_end = offset; | |
1690 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1691 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1692 | return; | |
1693 | retry: | |
1694 | fc_fcp_retry_cmd(fsp); | |
1695 | } | |
1696 | ||
3a3b42bf RL |
1697 | /** |
1698 | * fc_fcp_srr_resp() - Handler for SRR response | |
1699 | * @seq: The sequence the SRR is on | |
1700 | * @fp: The SRR frame | |
1701 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1702 | */ |
1703 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1704 | { | |
1705 | struct fc_fcp_pkt *fsp = arg; | |
1706 | struct fc_frame_header *fh; | |
1707 | ||
1708 | if (IS_ERR(fp)) { | |
1709 | fc_fcp_srr_error(fsp, fp); | |
1710 | return; | |
1711 | } | |
1712 | ||
1713 | if (fc_fcp_lock_pkt(fsp)) | |
1714 | goto out; | |
1715 | ||
1716 | fh = fc_frame_header_get(fp); | |
1717 | /* | |
1718 | * BUG? fc_fcp_srr_error calls exch_done which would release | |
1719 | * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, | |
1720 | * then fc_exch_timeout would be sending an abort. The exch_done | |
1721 | * call by fc_fcp_srr_error would prevent fc_exch.c from seeing | |
1722 | * an abort response though. | |
1723 | */ | |
1724 | if (fh->fh_type == FC_TYPE_BLS) { | |
1725 | fc_fcp_unlock_pkt(fsp); | |
1726 | return; | |
1727 | } | |
1728 | ||
42e9a92f RL |
1729 | switch (fc_frame_payload_op(fp)) { |
1730 | case ELS_LS_ACC: | |
1731 | fsp->recov_retry = 0; | |
f2817ec2 | 1732 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f RL |
1733 | break; |
1734 | case ELS_LS_RJT: | |
1735 | default: | |
ac17ea8d | 1736 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1737 | break; |
1738 | } | |
1739 | fc_fcp_unlock_pkt(fsp); | |
42e9a92f | 1740 | out: |
0a219edb | 1741 | fsp->lp->tt.exch_done(seq); |
42e9a92f | 1742 | fc_frame_free(fp); |
42e9a92f RL |
1743 | } |
1744 | ||
3a3b42bf RL |
1745 | /** |
1746 | * fc_fcp_srr_error() - Handler for SRR errors | |
1747 | * @fsp: The FCP packet that the SRR error is on | |
1748 | * @fp: The SRR frame | |
1749 | */ | |
42e9a92f RL |
1750 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1751 | { | |
1752 | if (fc_fcp_lock_pkt(fsp)) | |
1753 | goto out; | |
42e9a92f RL |
1754 | switch (PTR_ERR(fp)) { |
1755 | case -FC_EX_TIMEOUT: | |
1756 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1757 | fc_fcp_rec(fsp); | |
1758 | else | |
ac17ea8d | 1759 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1760 | break; |
1761 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1762 | /* fall through */ | |
1763 | default: | |
1764 | fc_fcp_retry_cmd(fsp); | |
1765 | break; | |
1766 | } | |
1767 | fc_fcp_unlock_pkt(fsp); | |
1768 | out: | |
0a219edb | 1769 | fsp->lp->tt.exch_done(fsp->recov_seq); |
42e9a92f RL |
1770 | } |
1771 | ||
3a3b42bf RL |
1772 | /** |
1773 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1774 | * @lport: The local port to be checked | |
1775 | */ | |
1776 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1777 | { |
1778 | /* lock ? */ | |
3a3b42bf RL |
1779 | return (lport->state == LPORT_ST_READY) && |
1780 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1781 | } |
1782 | ||
1783 | /** | |
3a3b42bf | 1784 | * fc_queuecommand() - The queuecommand function of the SCSI template |
04885b16 | 1785 | * @shost: The Scsi_Host that the command was issued to |
3a3b42bf | 1786 | * @cmd: The scsi_cmnd to be executed |
42e9a92f | 1787 | * |
04885b16 | 1788 | * This is the i/o strategy routine, called by the SCSI layer. |
42e9a92f | 1789 | */ |
04885b16 | 1790 | int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) |
42e9a92f | 1791 | { |
04885b16 | 1792 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
1793 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1794 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1795 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1796 | int rval; |
1797 | int rc = 0; | |
1bd49b48 | 1798 | struct fc_stats *stats; |
42e9a92f | 1799 | |
42e9a92f RL |
1800 | rval = fc_remote_port_chkready(rport); |
1801 | if (rval) { | |
1802 | sc_cmd->result = rval; | |
04885b16 | 1803 | sc_cmd->scsi_done(sc_cmd); |
be948fc3 | 1804 | return 0; |
42e9a92f RL |
1805 | } |
1806 | ||
1807 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1808 | /* | |
1809 | * rport is transitioning from blocked/deleted to | |
1810 | * online | |
1811 | */ | |
1812 | sc_cmd->result = DID_IMM_RETRY << 16; | |
04885b16 | 1813 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
1814 | goto out; |
1815 | } | |
1816 | ||
3a3b42bf | 1817 | rpriv = rport->dd_data; |
42e9a92f | 1818 | |
3a3b42bf | 1819 | if (!fc_fcp_lport_queue_ready(lport)) { |
84c3e1ad VD |
1820 | if (lport->qfull) |
1821 | fc_fcp_can_queue_ramp_down(lport); | |
42e9a92f RL |
1822 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1823 | goto out; | |
1824 | } | |
1825 | ||
3a3b42bf | 1826 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1827 | if (fsp == NULL) { |
1828 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1829 | goto out; | |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * build the libfc request pkt | |
1834 | */ | |
1835 | fsp->cmd = sc_cmd; /* save the cmd */ | |
42e9a92f | 1836 | fsp->rport = rport; /* set the remote port ptr */ |
42e9a92f RL |
1837 | |
1838 | /* | |
1839 | * set up the transfer length | |
1840 | */ | |
1841 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1842 | fsp->xfer_len = 0; | |
1843 | ||
1844 | /* | |
1845 | * setup the data direction | |
1846 | */ | |
1bd49b48 | 1847 | stats = per_cpu_ptr(lport->stats, get_cpu()); |
42e9a92f RL |
1848 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1849 | fsp->req_flags = FC_SRB_READ; | |
1850 | stats->InputRequests++; | |
5f0e385f | 1851 | stats->InputBytes += fsp->data_len; |
42e9a92f RL |
1852 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
1853 | fsp->req_flags = FC_SRB_WRITE; | |
1854 | stats->OutputRequests++; | |
5f0e385f | 1855 | stats->OutputBytes += fsp->data_len; |
42e9a92f RL |
1856 | } else { |
1857 | fsp->req_flags = 0; | |
1858 | stats->ControlRequests++; | |
1859 | } | |
f018b73a | 1860 | put_cpu(); |
42e9a92f | 1861 | |
42e9a92f RL |
1862 | /* |
1863 | * send it to the lower layer | |
1864 | * if we get -1 return then put the request in the pending | |
1865 | * queue. | |
1866 | */ | |
3a3b42bf | 1867 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1868 | if (rval != 0) { |
1869 | fsp->state = FC_SRB_FREE; | |
1870 | fc_fcp_pkt_release(fsp); | |
1871 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1872 | } | |
1873 | out: | |
1874 | return rc; | |
1875 | } | |
1876 | EXPORT_SYMBOL(fc_queuecommand); | |
1877 | ||
1878 | /** | |
3a3b42bf RL |
1879 | * fc_io_compl() - Handle responses for completed commands |
1880 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1881 | * |
3a3b42bf | 1882 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1883 | * The fcp packet lock must be held when calling. |
1884 | */ | |
1885 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1886 | { | |
1887 | struct fc_fcp_internal *si; | |
1888 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1889 | struct fc_lport *lport; |
42e9a92f RL |
1890 | unsigned long flags; |
1891 | ||
b277d2aa YZ |
1892 | /* release outstanding ddp context */ |
1893 | fc_fcp_ddp_done(fsp); | |
1894 | ||
42e9a92f RL |
1895 | fsp->state |= FC_SRB_COMPL; |
1896 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1897 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1898 | del_timer_sync(&fsp->timer); | |
1899 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1900 | } | |
1901 | ||
3a3b42bf RL |
1902 | lport = fsp->lp; |
1903 | si = fc_get_scsi_internal(lport); | |
42e9a92f RL |
1904 | |
1905 | /* | |
84c3e1ad VD |
1906 | * if can_queue ramp down is done then try can_queue ramp up |
1907 | * since commands are completing now. | |
42e9a92f | 1908 | */ |
84c3e1ad VD |
1909 | if (si->last_can_queue_ramp_down_time) |
1910 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1911 | |
1912 | sc_cmd = fsp->cmd; | |
42e9a92f RL |
1913 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; |
1914 | switch (fsp->status_code) { | |
1915 | case FC_COMPLETE: | |
1916 | if (fsp->cdb_status == 0) { | |
1917 | /* | |
1918 | * good I/O status | |
1919 | */ | |
1920 | sc_cmd->result = DID_OK << 16; | |
1921 | if (fsp->scsi_resid) | |
1922 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1923 | } else { |
1924 | /* | |
1925 | * transport level I/O was ok but scsi | |
1926 | * has non zero status | |
1927 | */ | |
1928 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1929 | } | |
1930 | break; | |
1931 | case FC_ERROR: | |
b3ef990c RL |
1932 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1933 | "due to FC_ERROR\n"); | |
42e9a92f RL |
1934 | sc_cmd->result = DID_ERROR << 16; |
1935 | break; | |
1936 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1937 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1938 | /* |
1939 | * scsi status is good but transport level | |
26d9cab5 | 1940 | * underrun. |
42e9a92f | 1941 | */ |
b3ef990c RL |
1942 | if (fsp->state & FC_SRB_RCV_STATUS) { |
1943 | sc_cmd->result = DID_OK << 16; | |
1944 | } else { | |
1945 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
1946 | " due to FC_DATA_UNDRUN (trans)\n"); | |
1947 | sc_cmd->result = DID_ERROR << 16; | |
1948 | } | |
42e9a92f RL |
1949 | } else { |
1950 | /* | |
1951 | * scsi got underrun, this is an error | |
1952 | */ | |
b3ef990c RL |
1953 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1954 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
42e9a92f RL |
1955 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
1956 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1957 | } | |
1958 | break; | |
1959 | case FC_DATA_OVRRUN: | |
1960 | /* | |
1961 | * overrun is an error | |
1962 | */ | |
b3ef990c RL |
1963 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1964 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
1965 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
1966 | break; | |
1967 | case FC_CMD_ABORTED: | |
b3ef990c | 1968 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
ac17ea8d | 1969 | "due to FC_CMD_ABORTED\n"); |
d5e6054a | 1970 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f | 1971 | break; |
42e9a92f | 1972 | case FC_CMD_RESET: |
ac17ea8d | 1973 | FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " |
1974 | "due to FC_CMD_RESET\n"); | |
42e9a92f RL |
1975 | sc_cmd->result = (DID_RESET << 16); |
1976 | break; | |
1977 | case FC_HRD_ERROR: | |
ac17ea8d | 1978 | FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " |
1979 | "due to FC_HRD_ERROR\n"); | |
42e9a92f RL |
1980 | sc_cmd->result = (DID_NO_CONNECT << 16); |
1981 | break; | |
ac17ea8d | 1982 | case FC_CRC_ERROR: |
1983 | FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " | |
1984 | "due to FC_CRC_ERROR\n"); | |
1985 | sc_cmd->result = (DID_PARITY << 16); | |
1986 | break; | |
1987 | case FC_TIMED_OUT: | |
1988 | FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " | |
1989 | "due to FC_TIMED_OUT\n"); | |
1990 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
1991 | break; | |
42e9a92f | 1992 | default: |
b3ef990c RL |
1993 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1994 | "due to unknown error\n"); | |
42e9a92f RL |
1995 | sc_cmd->result = (DID_ERROR << 16); |
1996 | break; | |
1997 | } | |
1998 | ||
75eee725 VD |
1999 | if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) |
2000 | sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); | |
e0d93c5b | 2001 | |
c1ecb90a | 2002 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2003 | list_del(&fsp->list); |
2004 | sc_cmd->SCp.ptr = NULL; | |
8b7ac2bb | 2005 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f | 2006 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
2007 | |
2008 | /* release ref from initial allocation in queue command */ | |
2009 | fc_fcp_pkt_release(fsp); | |
2010 | } | |
2011 | ||
42e9a92f | 2012 | /** |
34f42a07 | 2013 | * fc_eh_abort() - Abort a command |
3a3b42bf | 2014 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 2015 | * |
3a3b42bf RL |
2016 | * From SCSI host template. |
2017 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
2018 | */ |
2019 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
2020 | { | |
2021 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 2022 | struct fc_lport *lport; |
8b7ac2bb | 2023 | struct fc_fcp_internal *si; |
42e9a92f RL |
2024 | int rc = FAILED; |
2025 | unsigned long flags; | |
21cc0bd3 VD |
2026 | int rval; |
2027 | ||
2028 | rval = fc_block_scsi_eh(sc_cmd); | |
2029 | if (rval) | |
2030 | return rval; | |
42e9a92f | 2031 | |
3a3b42bf RL |
2032 | lport = shost_priv(sc_cmd->device->host); |
2033 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2034 | return rc; |
3a3b42bf | 2035 | else if (!lport->link_up) |
42e9a92f RL |
2036 | return rc; |
2037 | ||
8b7ac2bb VD |
2038 | si = fc_get_scsi_internal(lport); |
2039 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f RL |
2040 | fsp = CMD_SP(sc_cmd); |
2041 | if (!fsp) { | |
2042 | /* command completed while scsi eh was setting up */ | |
3c2c3bf2 | 2043 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2044 | return SUCCESS; |
2045 | } | |
2046 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
2047 | fc_fcp_pkt_hold(fsp); | |
8b7ac2bb | 2048 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2049 | |
2050 | if (fc_fcp_lock_pkt(fsp)) { | |
2051 | /* completed while we were waiting for timer to be deleted */ | |
2052 | rc = SUCCESS; | |
2053 | goto release_pkt; | |
2054 | } | |
2055 | ||
c340111d | 2056 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2057 | fc_fcp_unlock_pkt(fsp); |
2058 | ||
2059 | release_pkt: | |
2060 | fc_fcp_pkt_release(fsp); | |
2061 | return rc; | |
2062 | } | |
2063 | EXPORT_SYMBOL(fc_eh_abort); | |
2064 | ||
2065 | /** | |
3a3b42bf RL |
2066 | * fc_eh_device_reset() - Reset a single LUN |
2067 | * @sc_cmd: The SCSI command which identifies the device whose | |
2068 | * LUN is to be reset | |
42e9a92f | 2069 | * |
3a3b42bf | 2070 | * Set from SCSI host template. |
42e9a92f RL |
2071 | */ |
2072 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2073 | { | |
3a3b42bf | 2074 | struct fc_lport *lport; |
42e9a92f RL |
2075 | struct fc_fcp_pkt *fsp; |
2076 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2077 | int rc = FAILED; | |
42e9a92f RL |
2078 | int rval; |
2079 | ||
21cc0bd3 | 2080 | rval = fc_block_scsi_eh(sc_cmd); |
42e9a92f | 2081 | if (rval) |
21cc0bd3 | 2082 | return rval; |
42e9a92f | 2083 | |
3a3b42bf | 2084 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2085 | |
3a3b42bf | 2086 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2087 | return rc; |
2088 | ||
ce8b5df0 | 2089 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2090 | |
3a3b42bf | 2091 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2092 | if (fsp == NULL) { |
7414705e | 2093 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2094 | goto out; |
2095 | } | |
2096 | ||
2097 | /* | |
2098 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2099 | * the sc passed in is not setup for execution like when sent | |
2100 | * through the queuecommand callout. | |
2101 | */ | |
42e9a92f RL |
2102 | fsp->rport = rport; /* set the remote port ptr */ |
2103 | ||
2104 | /* | |
2105 | * flush outstanding commands | |
2106 | */ | |
3a3b42bf | 2107 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2108 | fsp->state = FC_SRB_FREE; |
2109 | fc_fcp_pkt_release(fsp); | |
2110 | ||
2111 | out: | |
2112 | return rc; | |
2113 | } | |
2114 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2115 | ||
2116 | /** | |
3a3b42bf RL |
2117 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2118 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2119 | */ |
2120 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2121 | { | |
2122 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2123 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2124 | unsigned long wait_tmo; |
2125 | ||
3a3b42bf | 2126 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2127 | |
21cc0bd3 VD |
2128 | fc_block_scsi_eh(sc_cmd); |
2129 | ||
3a3b42bf | 2130 | lport->tt.lport_reset(lport); |
42e9a92f | 2131 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2132 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2133 | wait_tmo)) | |
42e9a92f RL |
2134 | msleep(1000); |
2135 | ||
3a3b42bf | 2136 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2137 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
7b2787ec | 2138 | "on port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2139 | return SUCCESS; |
2140 | } else { | |
7414705e | 2141 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2142 | "port (%6.6x) is not ready.\n", |
7b2787ec | 2143 | lport->port_id); |
42e9a92f RL |
2144 | return FAILED; |
2145 | } | |
2146 | } | |
2147 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2148 | ||
2149 | /** | |
3a3b42bf RL |
2150 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2151 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2152 | * |
2153 | * Configures queue depth based on host's cmd_per_len. If not set | |
2154 | * then we use the libfc default. | |
2155 | */ | |
2156 | int fc_slave_alloc(struct scsi_device *sdev) | |
2157 | { | |
2158 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2159 | |
2160 | if (!rport || fc_remote_port_chkready(rport)) | |
2161 | return -ENXIO; | |
2162 | ||
14caf44c VD |
2163 | if (sdev->tagged_supported) |
2164 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2165 | else | |
2166 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2167 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2168 | ||
42e9a92f RL |
2169 | return 0; |
2170 | } | |
2171 | EXPORT_SYMBOL(fc_slave_alloc); | |
2172 | ||
3a3b42bf RL |
2173 | /** |
2174 | * fc_change_queue_depth() - Change a device's queue depth | |
2175 | * @sdev: The SCSI device whose queue depth is to change | |
2176 | * @qdepth: The new queue depth | |
2177 | * @reason: The resason for the change | |
2178 | */ | |
e881a172 | 2179 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2180 | { |
5c20848a MC |
2181 | switch (reason) { |
2182 | case SCSI_QDEPTH_DEFAULT: | |
2183 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2184 | break; | |
2185 | case SCSI_QDEPTH_QFULL: | |
2186 | scsi_track_queue_full(sdev, qdepth); | |
2187 | break; | |
229b8d72 VD |
2188 | case SCSI_QDEPTH_RAMP_UP: |
2189 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2190 | break; | |
5c20848a | 2191 | default: |
e881a172 | 2192 | return -EOPNOTSUPP; |
5c20848a | 2193 | } |
42e9a92f RL |
2194 | return sdev->queue_depth; |
2195 | } | |
2196 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2197 | ||
3a3b42bf RL |
2198 | /** |
2199 | * fc_change_queue_type() - Change a device's queue type | |
2200 | * @sdev: The SCSI device whose queue depth is to change | |
2201 | * @tag_type: Identifier for queue type | |
2202 | */ | |
42e9a92f RL |
2203 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
2204 | { | |
2205 | if (sdev->tagged_supported) { | |
2206 | scsi_set_tag_type(sdev, tag_type); | |
2207 | if (tag_type) | |
2208 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2209 | else | |
2210 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2211 | } else | |
2212 | tag_type = 0; | |
2213 | ||
2214 | return tag_type; | |
2215 | } | |
2216 | EXPORT_SYMBOL(fc_change_queue_type); | |
2217 | ||
3a3b42bf RL |
2218 | /** |
2219 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2220 | * @lport: The local port that no longer needs the FCP layer | |
2221 | */ | |
2222 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2223 | { |
3a3b42bf | 2224 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2225 | |
2226 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2227 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
7b2787ec | 2228 | "port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2229 | |
2230 | mempool_destroy(si->scsi_pkt_pool); | |
2231 | kfree(si); | |
3a3b42bf | 2232 | lport->scsi_priv = NULL; |
42e9a92f RL |
2233 | } |
2234 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2235 | ||
55204909 | 2236 | int fc_setup_fcp(void) |
93e6d5ab RL |
2237 | { |
2238 | int rc = 0; | |
2239 | ||
2240 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2241 | sizeof(struct fc_fcp_pkt), | |
2242 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2243 | if (!scsi_pkt_cachep) { | |
2244 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2245 | "module load failed!"); | |
2246 | rc = -ENOMEM; | |
2247 | } | |
2248 | ||
2249 | return rc; | |
2250 | } | |
2251 | ||
55204909 | 2252 | void fc_destroy_fcp(void) |
93e6d5ab RL |
2253 | { |
2254 | if (scsi_pkt_cachep) | |
2255 | kmem_cache_destroy(scsi_pkt_cachep); | |
2256 | } | |
2257 | ||
3a3b42bf RL |
2258 | /** |
2259 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2260 | * @lport: The local port to initialize the exchange layer for | |
2261 | */ | |
2262 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2263 | { |
2264 | int rc; | |
2265 | struct fc_fcp_internal *si; | |
2266 | ||
3a3b42bf RL |
2267 | if (!lport->tt.fcp_cmd_send) |
2268 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2269 | |
3a3b42bf RL |
2270 | if (!lport->tt.fcp_cleanup) |
2271 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2272 | |
3a3b42bf RL |
2273 | if (!lport->tt.fcp_abort_io) |
2274 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2275 | |
2276 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2277 | if (!si) | |
2278 | return -ENOMEM; | |
3a3b42bf | 2279 | lport->scsi_priv = si; |
84c3e1ad | 2280 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2281 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2282 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2283 | |
2284 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2285 | if (!si->scsi_pkt_pool) { | |
2286 | rc = -ENOMEM; | |
2287 | goto free_internal; | |
2288 | } | |
2289 | return 0; | |
2290 | ||
2291 | free_internal: | |
2292 | kfree(si); | |
2293 | return rc; | |
2294 | } | |
2295 | EXPORT_SYMBOL(fc_fcp_init); |