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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 | |
93e6d5ab | 45 | struct kmem_cache *scsi_pkt_cachep; |
42e9a92f RL |
46 | |
47 | /* SRB state definitions */ | |
48 | #define FC_SRB_FREE 0 /* cmd is free */ | |
49 | #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ | |
50 | #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ | |
51 | #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ | |
3ad2f3fb | 52 | #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ |
42e9a92f RL |
53 | #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ |
54 | #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ | |
55 | #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ | |
42e9a92f RL |
56 | |
57 | #define FC_SRB_READ (1 << 1) | |
58 | #define FC_SRB_WRITE (1 << 0) | |
59 | ||
e0883a3c | 60 | /* constant added to e_d_tov timeout to get rec_tov value */ |
61 | #define REC_TOV_CONST 1 | |
62 | ||
42e9a92f | 63 | /* |
8b7ac2bb | 64 | * The SCp.ptr should be tested and set under the scsi_pkt_queue lock |
42e9a92f RL |
65 | */ |
66 | #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) | |
67 | #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) | |
68 | #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) | |
69 | #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) | |
70 | #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) | |
71 | ||
3a3b42bf RL |
72 | /** |
73 | * struct fc_fcp_internal - FCP layer internal data | |
c1ecb90a CL |
74 | * @scsi_pkt_pool: Memory pool to draw FCP packets from |
75 | * @scsi_queue_lock: Protects the scsi_pkt_queue | |
3a3b42bf | 76 | * @scsi_pkt_queue: Current FCP packets |
84c3e1ad VD |
77 | * @last_can_queue_ramp_down_time: ramp down time |
78 | * @last_can_queue_ramp_up_time: ramp up time | |
79 | * @max_can_queue: max can_queue size | |
3a3b42bf | 80 | */ |
42e9a92f | 81 | struct fc_fcp_internal { |
c1ecb90a CL |
82 | mempool_t *scsi_pkt_pool; |
83 | spinlock_t scsi_queue_lock; | |
84 | struct list_head scsi_pkt_queue; | |
85 | unsigned long last_can_queue_ramp_down_time; | |
86 | unsigned long last_can_queue_ramp_up_time; | |
87 | int max_can_queue; | |
42e9a92f RL |
88 | }; |
89 | ||
90 | #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) | |
91 | ||
92 | /* | |
93 | * function prototypes | |
94 | * FC scsi I/O related functions | |
95 | */ | |
96 | static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); | |
97 | static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); | |
98 | static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); | |
99 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *); | |
100 | static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); | |
3a3b42bf | 101 | static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); |
ac17ea8d | 102 | static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); |
3a3b42bf | 103 | static void fc_fcp_timeout(unsigned long); |
42e9a92f RL |
104 | static void fc_fcp_rec(struct fc_fcp_pkt *); |
105 | static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); | |
106 | static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); | |
107 | static void fc_io_compl(struct fc_fcp_pkt *); | |
108 | ||
109 | static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); | |
110 | static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); | |
111 | static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); | |
112 | ||
113 | /* | |
114 | * command status codes | |
115 | */ | |
116 | #define FC_COMPLETE 0 | |
117 | #define FC_CMD_ABORTED 1 | |
118 | #define FC_CMD_RESET 2 | |
119 | #define FC_CMD_PLOGO 3 | |
120 | #define FC_SNS_RCV 4 | |
121 | #define FC_TRANS_ERR 5 | |
122 | #define FC_DATA_OVRRUN 6 | |
123 | #define FC_DATA_UNDRUN 7 | |
124 | #define FC_ERROR 8 | |
125 | #define FC_HRD_ERROR 9 | |
ac17ea8d | 126 | #define FC_CRC_ERROR 10 |
127 | #define FC_TIMED_OUT 11 | |
42e9a92f RL |
128 | |
129 | /* | |
130 | * Error recovery timeout values. | |
131 | */ | |
42e9a92f | 132 | #define FC_SCSI_TM_TOV (10 * HZ) |
42e9a92f | 133 | #define FC_HOST_RESET_TIMEOUT (30 * HZ) |
84c3e1ad | 134 | #define FC_CAN_QUEUE_PERIOD (60 * HZ) |
42e9a92f RL |
135 | |
136 | #define FC_MAX_ERROR_CNT 5 | |
137 | #define FC_MAX_RECOV_RETRY 3 | |
138 | ||
139 | #define FC_FCP_DFLT_QUEUE_DEPTH 32 | |
140 | ||
141 | /** | |
3a3b42bf RL |
142 | * fc_fcp_pkt_alloc() - Allocate a fcp_pkt |
143 | * @lport: The local port that the FCP packet is for | |
144 | * @gfp: GFP flags for allocation | |
42e9a92f | 145 | * |
3a3b42bf RL |
146 | * Return value: fcp_pkt structure or null on allocation failure. |
147 | * Context: Can be called from process context, no lock is required. | |
42e9a92f | 148 | */ |
3a3b42bf | 149 | static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) |
42e9a92f | 150 | { |
3a3b42bf | 151 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
152 | struct fc_fcp_pkt *fsp; |
153 | ||
154 | fsp = mempool_alloc(si->scsi_pkt_pool, gfp); | |
155 | if (fsp) { | |
156 | memset(fsp, 0, sizeof(*fsp)); | |
3a3b42bf | 157 | fsp->lp = lport; |
42e9a92f RL |
158 | atomic_set(&fsp->ref_cnt, 1); |
159 | init_timer(&fsp->timer); | |
160 | INIT_LIST_HEAD(&fsp->list); | |
161 | spin_lock_init(&fsp->scsi_pkt_lock); | |
162 | } | |
163 | return fsp; | |
164 | } | |
165 | ||
166 | /** | |
3a3b42bf RL |
167 | * fc_fcp_pkt_release() - Release hold on a fcp_pkt |
168 | * @fsp: The FCP packet to be released | |
42e9a92f | 169 | * |
3a3b42bf RL |
170 | * Context: Can be called from process or interrupt context, |
171 | * no lock is required. | |
42e9a92f RL |
172 | */ |
173 | static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) | |
174 | { | |
175 | if (atomic_dec_and_test(&fsp->ref_cnt)) { | |
176 | struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); | |
177 | ||
178 | mempool_free(fsp, si->scsi_pkt_pool); | |
179 | } | |
180 | } | |
181 | ||
3a3b42bf RL |
182 | /** |
183 | * fc_fcp_pkt_hold() - Hold a fcp_pkt | |
184 | * @fsp: The FCP packet to be held | |
185 | */ | |
42e9a92f RL |
186 | static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) |
187 | { | |
188 | atomic_inc(&fsp->ref_cnt); | |
189 | } | |
190 | ||
191 | /** | |
3a3b42bf RL |
192 | * fc_fcp_pkt_destory() - Release hold on a fcp_pkt |
193 | * @seq: The sequence that the FCP packet is on (required by destructor API) | |
194 | * @fsp: The FCP packet to be released | |
195 | * | |
196 | * This routine is called by a destructor callback in the exch_seq_send() | |
197 | * routine of the libfc Transport Template. The 'struct fc_seq' is a required | |
198 | * argument even though it is not used by this routine. | |
42e9a92f | 199 | * |
3a3b42bf | 200 | * Context: No locking required. |
42e9a92f RL |
201 | */ |
202 | static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) | |
203 | { | |
204 | fc_fcp_pkt_release(fsp); | |
205 | } | |
206 | ||
207 | /** | |
3a3b42bf RL |
208 | * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count |
209 | * @fsp: The FCP packet to be locked and incremented | |
42e9a92f | 210 | * |
3a3b42bf | 211 | * We should only return error if we return a command to SCSI-ml before |
42e9a92f RL |
212 | * getting a response. This can happen in cases where we send a abort, but |
213 | * do not wait for the response and the abort and command can be passing | |
214 | * each other on the wire/network-layer. | |
215 | * | |
216 | * Note: this function locks the packet and gets a reference to allow | |
217 | * callers to call the completion function while the lock is held and | |
218 | * not have to worry about the packets refcount. | |
219 | * | |
220 | * TODO: Maybe we should just have callers grab/release the lock and | |
221 | * have a function that they call to verify the fsp and grab a ref if | |
222 | * needed. | |
223 | */ | |
224 | static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) | |
225 | { | |
226 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
227 | if (fsp->state & FC_SRB_COMPL) { | |
228 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
229 | return -EPERM; | |
230 | } | |
231 | ||
232 | fc_fcp_pkt_hold(fsp); | |
233 | return 0; | |
234 | } | |
235 | ||
3a3b42bf RL |
236 | /** |
237 | * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its | |
238 | * reference count | |
239 | * @fsp: The FCP packet to be unlocked and decremented | |
240 | */ | |
42e9a92f RL |
241 | static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) |
242 | { | |
243 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
244 | fc_fcp_pkt_release(fsp); | |
245 | } | |
246 | ||
3a3b42bf RL |
247 | /** |
248 | * fc_fcp_timer_set() - Start a timer for a fcp_pkt | |
249 | * @fsp: The FCP packet to start a timer for | |
250 | * @delay: The timeout period for the timer | |
251 | */ | |
42e9a92f RL |
252 | static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) |
253 | { | |
254 | if (!(fsp->state & FC_SRB_COMPL)) | |
255 | mod_timer(&fsp->timer, jiffies + delay); | |
256 | } | |
257 | ||
3a3b42bf RL |
258 | /** |
259 | * fc_fcp_send_abort() - Send an abort for exchanges associated with a | |
260 | * fcp_pkt | |
261 | * @fsp: The FCP packet to abort exchanges on | |
262 | */ | |
42e9a92f RL |
263 | static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) |
264 | { | |
265 | if (!fsp->seq_ptr) | |
266 | return -EINVAL; | |
267 | ||
268 | fsp->state |= FC_SRB_ABORT_PENDING; | |
269 | return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); | |
270 | } | |
271 | ||
3a3b42bf RL |
272 | /** |
273 | * fc_fcp_retry_cmd() - Retry a fcp_pkt | |
274 | * @fsp: The FCP packet to be retried | |
275 | * | |
276 | * Sets the status code to be FC_ERROR and then calls | |
277 | * fc_fcp_complete_locked() which in turn calls fc_io_compl(). | |
278 | * fc_io_compl() will notify the SCSI-ml that the I/O is done. | |
279 | * The SCSI-ml will retry the command. | |
42e9a92f RL |
280 | */ |
281 | static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) | |
282 | { | |
283 | if (fsp->seq_ptr) { | |
284 | fsp->lp->tt.exch_done(fsp->seq_ptr); | |
285 | fsp->seq_ptr = NULL; | |
286 | } | |
287 | ||
288 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1c9fbafc | 289 | fsp->io_status = 0; |
42e9a92f RL |
290 | fsp->status_code = FC_ERROR; |
291 | fc_fcp_complete_locked(fsp); | |
292 | } | |
293 | ||
3a3b42bf RL |
294 | /** |
295 | * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context | |
296 | * @fsp: The FCP packet that will manage the DDP frames | |
297 | * @xid: The XID that will be used for the DDP exchange | |
b277d2aa YZ |
298 | */ |
299 | void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) | |
300 | { | |
3a3b42bf | 301 | struct fc_lport *lport; |
b277d2aa | 302 | |
3a3b42bf | 303 | lport = fsp->lp; |
b277d2aa | 304 | if ((fsp->req_flags & FC_SRB_READ) && |
3a3b42bf RL |
305 | (lport->lro_enabled) && (lport->tt.ddp_setup)) { |
306 | if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), | |
307 | scsi_sg_count(fsp->cmd))) | |
b277d2aa YZ |
308 | fsp->xfer_ddp = xid; |
309 | } | |
310 | } | |
b277d2aa | 311 | |
3a3b42bf RL |
312 | /** |
313 | * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any | |
314 | * DDP related resources for a fcp_pkt | |
315 | * @fsp: The FCP packet that DDP had been used on | |
b277d2aa YZ |
316 | */ |
317 | static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) | |
318 | { | |
3a3b42bf | 319 | struct fc_lport *lport; |
b277d2aa YZ |
320 | |
321 | if (!fsp) | |
322 | return; | |
323 | ||
5e472d07 YZ |
324 | if (fsp->xfer_ddp == FC_XID_UNKNOWN) |
325 | return; | |
326 | ||
3a3b42bf RL |
327 | lport = fsp->lp; |
328 | if (lport->tt.ddp_done) { | |
329 | fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); | |
5e472d07 | 330 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
b277d2aa YZ |
331 | } |
332 | } | |
333 | ||
84c3e1ad VD |
334 | /** |
335 | * fc_fcp_can_queue_ramp_up() - increases can_queue | |
336 | * @lport: lport to ramp up can_queue | |
337 | * | |
338 | * Locking notes: Called with Scsi_Host lock held | |
339 | */ | |
340 | static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) | |
341 | { | |
342 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
343 | int can_queue; | |
344 | ||
345 | if (si->last_can_queue_ramp_up_time && | |
346 | (time_before(jiffies, si->last_can_queue_ramp_up_time + | |
347 | FC_CAN_QUEUE_PERIOD))) | |
348 | return; | |
349 | ||
350 | if (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
351 | FC_CAN_QUEUE_PERIOD)) | |
352 | return; | |
353 | ||
354 | si->last_can_queue_ramp_up_time = jiffies; | |
355 | ||
356 | can_queue = lport->host->can_queue << 1; | |
357 | if (can_queue >= si->max_can_queue) { | |
358 | can_queue = si->max_can_queue; | |
359 | si->last_can_queue_ramp_down_time = 0; | |
360 | } | |
361 | lport->host->can_queue = can_queue; | |
362 | shost_printk(KERN_ERR, lport->host, "libfc: increased " | |
363 | "can_queue to %d.\n", can_queue); | |
364 | } | |
365 | ||
c46be11a VD |
366 | /** |
367 | * fc_fcp_can_queue_ramp_down() - reduces can_queue | |
368 | * @lport: lport to reduce can_queue | |
369 | * | |
370 | * If we are getting memory allocation failures, then we may | |
371 | * be trying to execute too many commands. We let the running | |
372 | * commands complete or timeout, then try again with a reduced | |
373 | * can_queue. Eventually we will hit the point where we run | |
374 | * on all reserved structs. | |
84c3e1ad VD |
375 | * |
376 | * Locking notes: Called with Scsi_Host lock held | |
c46be11a VD |
377 | */ |
378 | static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) | |
379 | { | |
380 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); | |
c46be11a VD |
381 | int can_queue; |
382 | ||
84c3e1ad VD |
383 | if (si->last_can_queue_ramp_down_time && |
384 | (time_before(jiffies, si->last_can_queue_ramp_down_time + | |
385 | FC_CAN_QUEUE_PERIOD))) | |
386 | return; | |
387 | ||
388 | si->last_can_queue_ramp_down_time = jiffies; | |
c46be11a VD |
389 | |
390 | can_queue = lport->host->can_queue; | |
391 | can_queue >>= 1; | |
392 | if (!can_queue) | |
393 | can_queue = 1; | |
394 | lport->host->can_queue = can_queue; | |
395 | shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" | |
396 | "Reducing can_queue to %d.\n", can_queue); | |
c46be11a VD |
397 | } |
398 | ||
399 | /* | |
400 | * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. | |
401 | * @lport: fc lport struct | |
402 | * @len: payload length | |
403 | * | |
404 | * Allocates fc_frame structure and buffer but if fails to allocate | |
405 | * then reduce can_queue. | |
406 | */ | |
407 | static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, | |
408 | size_t len) | |
409 | { | |
410 | struct fc_frame *fp; | |
84c3e1ad | 411 | unsigned long flags; |
c46be11a VD |
412 | |
413 | fp = fc_frame_alloc(lport, len); | |
c1ecb90a CL |
414 | if (likely(fp)) |
415 | return fp; | |
416 | ||
417 | /* error case */ | |
418 | spin_lock_irqsave(lport->host->host_lock, flags); | |
419 | fc_fcp_can_queue_ramp_down(lport); | |
420 | spin_unlock_irqrestore(lport->host->host_lock, flags); | |
421 | return NULL; | |
c46be11a VD |
422 | } |
423 | ||
3a3b42bf RL |
424 | /** |
425 | * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target | |
426 | * @fsp: The FCP packet the data is on | |
427 | * @fp: The data frame | |
42e9a92f RL |
428 | */ |
429 | static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
430 | { | |
431 | struct scsi_cmnd *sc = fsp->cmd; | |
3a3b42bf | 432 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
433 | struct fcoe_dev_stats *stats; |
434 | struct fc_frame_header *fh; | |
435 | size_t start_offset; | |
436 | size_t offset; | |
437 | u32 crc; | |
438 | u32 copy_len = 0; | |
439 | size_t len; | |
440 | void *buf; | |
441 | struct scatterlist *sg; | |
58682874 | 442 | u32 nents; |
ac17ea8d | 443 | u8 host_bcode = FC_COMPLETE; |
42e9a92f RL |
444 | |
445 | fh = fc_frame_header_get(fp); | |
446 | offset = ntohl(fh->fh_parm_offset); | |
447 | start_offset = offset; | |
448 | len = fr_len(fp) - sizeof(*fh); | |
449 | buf = fc_frame_payload_get(fp, 0); | |
450 | ||
5c12c418 | 451 | /* |
ac17ea8d | 452 | * if this I/O is ddped then clear it and initiate recovery since data |
453 | * frames are expected to be placed directly in that case. | |
454 | * | |
455 | * Indicate error to scsi-ml because something went wrong with the | |
456 | * ddp handling to get us here. | |
5c12c418 VD |
457 | */ |
458 | if (fsp->xfer_ddp != FC_XID_UNKNOWN) { | |
459 | fc_fcp_ddp_done(fsp); | |
ac17ea8d | 460 | FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); |
461 | host_bcode = FC_ERROR; | |
5c12c418 VD |
462 | goto err; |
463 | } | |
42e9a92f | 464 | if (offset + len > fsp->data_len) { |
34f42a07 | 465 | /* this should never happen */ |
42e9a92f RL |
466 | if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && |
467 | fc_frame_crc_check(fp)) | |
468 | goto crc_err; | |
7414705e RL |
469 | FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " |
470 | "data_len %x\n", len, offset, fsp->data_len); | |
ac17ea8d | 471 | |
472 | /* Data is corrupted indicate scsi-ml should retry */ | |
473 | host_bcode = FC_DATA_OVRRUN; | |
5c12c418 | 474 | goto err; |
42e9a92f RL |
475 | } |
476 | if (offset != fsp->xfer_len) | |
477 | fsp->state |= FC_SRB_DISCONTIG; | |
478 | ||
42e9a92f | 479 | sg = scsi_sglist(sc); |
58682874 | 480 | nents = scsi_sg_count(sc); |
42e9a92f | 481 | |
58682874 RL |
482 | if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { |
483 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
484 | &offset, KM_SOFTIRQ0, NULL); | |
485 | } else { | |
486 | crc = crc32(~0, (u8 *) fh, sizeof(*fh)); | |
487 | copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, | |
488 | &offset, KM_SOFTIRQ0, &crc); | |
42e9a92f | 489 | buf = fc_frame_payload_get(fp, 0); |
58682874 | 490 | if (len % 4) |
42e9a92f | 491 | crc = crc32(crc, buf + len, 4 - (len % 4)); |
42e9a92f RL |
492 | |
493 | if (~crc != le32_to_cpu(fr_crc(fp))) { | |
494 | crc_err: | |
f018b73a | 495 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f | 496 | stats->ErrorFrames++; |
f018b73a | 497 | /* per cpu count, not total count, but OK for limit */ |
42e9a92f | 498 | if (stats->InvalidCRCCount++ < 5) |
7414705e | 499 | printk(KERN_WARNING "libfc: CRC error on data " |
ce8b5df0 | 500 | "frame for port (%6.6x)\n", |
7b2787ec | 501 | lport->port_id); |
f018b73a | 502 | put_cpu(); |
42e9a92f RL |
503 | /* |
504 | * Assume the frame is total garbage. | |
505 | * We may have copied it over the good part | |
506 | * of the buffer. | |
507 | * If so, we need to retry the entire operation. | |
508 | * Otherwise, ignore it. | |
509 | */ | |
ac17ea8d | 510 | if (fsp->state & FC_SRB_DISCONTIG) { |
511 | host_bcode = FC_CRC_ERROR; | |
5c12c418 | 512 | goto err; |
ac17ea8d | 513 | } |
42e9a92f RL |
514 | return; |
515 | } | |
516 | } | |
517 | ||
518 | if (fsp->xfer_contig_end == start_offset) | |
519 | fsp->xfer_contig_end += copy_len; | |
520 | fsp->xfer_len += copy_len; | |
521 | ||
522 | /* | |
523 | * In the very rare event that this data arrived after the response | |
524 | * and completes the transfer, call the completion handler. | |
525 | */ | |
526 | if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && | |
527 | fsp->xfer_len == fsp->data_len - fsp->scsi_resid) | |
528 | fc_fcp_complete_locked(fsp); | |
5c12c418 VD |
529 | return; |
530 | err: | |
ac17ea8d | 531 | fc_fcp_recovery(fsp, host_bcode); |
42e9a92f RL |
532 | } |
533 | ||
34f42a07 | 534 | /** |
3a3b42bf RL |
535 | * fc_fcp_send_data() - Send SCSI data to a target |
536 | * @fsp: The FCP packet the data is on | |
537 | * @sp: The sequence the data is to be sent on | |
538 | * @offset: The starting offset for this data request | |
539 | * @seq_blen: The burst length for this data request | |
42e9a92f RL |
540 | * |
541 | * Called after receiving a Transfer Ready data descriptor. | |
3a3b42bf | 542 | * If the LLD is capable of sequence offload then send down the |
9ddc5b6f | 543 | * seq_blen amount of data in single frame, otherwise send |
3a3b42bf RL |
544 | * multiple frames of the maximum frame payload supported by |
545 | * the target port. | |
42e9a92f RL |
546 | */ |
547 | static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, | |
548 | size_t offset, size_t seq_blen) | |
549 | { | |
550 | struct fc_exch *ep; | |
551 | struct scsi_cmnd *sc; | |
552 | struct scatterlist *sg; | |
553 | struct fc_frame *fp = NULL; | |
3a3b42bf | 554 | struct fc_lport *lport = fsp->lp; |
18fa11ef | 555 | struct page *page; |
42e9a92f RL |
556 | size_t remaining; |
557 | size_t t_blen; | |
558 | size_t tlen; | |
559 | size_t sg_bytes; | |
560 | size_t frame_offset, fh_parm_offset; | |
18fa11ef | 561 | size_t off; |
42e9a92f RL |
562 | int error; |
563 | void *data = NULL; | |
564 | void *page_addr; | |
3a3b42bf | 565 | int using_sg = lport->sg_supp; |
42e9a92f RL |
566 | u32 f_ctl; |
567 | ||
568 | WARN_ON(seq_blen <= 0); | |
569 | if (unlikely(offset + seq_blen > fsp->data_len)) { | |
570 | /* this should never happen */ | |
7414705e RL |
571 | FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " |
572 | "offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
573 | fc_fcp_send_abort(fsp); |
574 | return 0; | |
575 | } else if (offset != fsp->xfer_len) { | |
576 | /* Out of Order Data Request - no problem, but unexpected. */ | |
7414705e RL |
577 | FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " |
578 | "seq_blen %zx offset %zx\n", seq_blen, offset); | |
42e9a92f RL |
579 | } |
580 | ||
581 | /* | |
582 | * if LLD is capable of seq_offload then set transport | |
583 | * burst length (t_blen) to seq_blen, otherwise set t_blen | |
584 | * to max FC frame payload previously set in fsp->max_payload. | |
585 | */ | |
276d6814 | 586 | t_blen = fsp->max_payload; |
3a3b42bf RL |
587 | if (lport->seq_offload) { |
588 | t_blen = min(seq_blen, (size_t)lport->lso_max); | |
7414705e | 589 | FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", |
3a3b42bf | 590 | fsp, seq_blen, lport->lso_max, t_blen); |
276d6814 YZ |
591 | } |
592 | ||
42e9a92f RL |
593 | if (t_blen > 512) |
594 | t_blen &= ~(512 - 1); /* round down to block size */ | |
42e9a92f RL |
595 | sc = fsp->cmd; |
596 | ||
597 | remaining = seq_blen; | |
598 | fh_parm_offset = frame_offset = offset; | |
599 | tlen = 0; | |
3a3b42bf | 600 | seq = lport->tt.seq_start_next(seq); |
42e9a92f RL |
601 | f_ctl = FC_FC_REL_OFF; |
602 | WARN_ON(!seq); | |
603 | ||
42e9a92f RL |
604 | sg = scsi_sglist(sc); |
605 | ||
606 | while (remaining > 0 && sg) { | |
607 | if (offset >= sg->length) { | |
608 | offset -= sg->length; | |
609 | sg = sg_next(sg); | |
610 | continue; | |
611 | } | |
612 | if (!fp) { | |
613 | tlen = min(t_blen, remaining); | |
614 | ||
615 | /* | |
616 | * TODO. Temporary workaround. fc_seq_send() can't | |
617 | * handle odd lengths in non-linear skbs. | |
618 | * This will be the final fragment only. | |
619 | */ | |
620 | if (tlen % 4) | |
621 | using_sg = 0; | |
a7bbc7f4 VD |
622 | fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); |
623 | if (!fp) | |
624 | return -ENOMEM; | |
625 | ||
626 | data = fc_frame_header_get(fp) + 1; | |
42e9a92f RL |
627 | fh_parm_offset = frame_offset; |
628 | fr_max_payload(fp) = fsp->max_payload; | |
629 | } | |
18fa11ef CL |
630 | |
631 | off = offset + sg->offset; | |
42e9a92f | 632 | sg_bytes = min(tlen, sg->length - offset); |
18fa11ef CL |
633 | sg_bytes = min(sg_bytes, |
634 | (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); | |
635 | page = sg_page(sg) + (off >> PAGE_SHIFT); | |
42e9a92f | 636 | if (using_sg) { |
18fa11ef | 637 | get_page(page); |
42e9a92f RL |
638 | skb_fill_page_desc(fp_skb(fp), |
639 | skb_shinfo(fp_skb(fp))->nr_frags, | |
18fa11ef | 640 | page, off & ~PAGE_MASK, sg_bytes); |
42e9a92f RL |
641 | fp_skb(fp)->data_len += sg_bytes; |
642 | fr_len(fp) += sg_bytes; | |
643 | fp_skb(fp)->truesize += PAGE_SIZE; | |
644 | } else { | |
42e9a92f RL |
645 | /* |
646 | * The scatterlist item may be bigger than PAGE_SIZE, | |
647 | * but we must not cross pages inside the kmap. | |
648 | */ | |
18fa11ef | 649 | page_addr = kmap_atomic(page, KM_SOFTIRQ0); |
42e9a92f RL |
650 | memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), |
651 | sg_bytes); | |
652 | kunmap_atomic(page_addr, KM_SOFTIRQ0); | |
653 | data += sg_bytes; | |
654 | } | |
655 | offset += sg_bytes; | |
656 | frame_offset += sg_bytes; | |
657 | tlen -= sg_bytes; | |
658 | remaining -= sg_bytes; | |
659 | ||
d37322a4 YZ |
660 | if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && |
661 | (tlen)) | |
42e9a92f RL |
662 | continue; |
663 | ||
664 | /* | |
665 | * Send sequence with transfer sequence initiative in case | |
666 | * this is last FCP frame of the sequence. | |
667 | */ | |
668 | if (remaining == 0) | |
669 | f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; | |
670 | ||
671 | ep = fc_seq_exch(seq); | |
672 | fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, | |
673 | FC_TYPE_FCP, f_ctl, fh_parm_offset); | |
674 | ||
675 | /* | |
676 | * send fragment using for a sequence. | |
677 | */ | |
3a3b42bf | 678 | error = lport->tt.seq_send(lport, seq, fp); |
42e9a92f RL |
679 | if (error) { |
680 | WARN_ON(1); /* send error should be rare */ | |
681 | fc_fcp_retry_cmd(fsp); | |
682 | return 0; | |
683 | } | |
684 | fp = NULL; | |
685 | } | |
686 | fsp->xfer_len += seq_blen; /* premature count? */ | |
687 | return 0; | |
688 | } | |
689 | ||
3a3b42bf RL |
690 | /** |
691 | * fc_fcp_abts_resp() - Send an ABTS response | |
692 | * @fsp: The FCP packet that is being aborted | |
693 | * @fp: The response frame | |
694 | */ | |
42e9a92f RL |
695 | static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
696 | { | |
697 | int ba_done = 1; | |
698 | struct fc_ba_rjt *brp; | |
699 | struct fc_frame_header *fh; | |
700 | ||
701 | fh = fc_frame_header_get(fp); | |
702 | switch (fh->fh_r_ctl) { | |
703 | case FC_RCTL_BA_ACC: | |
704 | break; | |
705 | case FC_RCTL_BA_RJT: | |
706 | brp = fc_frame_payload_get(fp, sizeof(*brp)); | |
707 | if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) | |
708 | break; | |
709 | /* fall thru */ | |
710 | default: | |
711 | /* | |
712 | * we will let the command timeout | |
713 | * and scsi-ml recover in this case, | |
714 | * therefore cleared the ba_done flag. | |
715 | */ | |
716 | ba_done = 0; | |
717 | } | |
718 | ||
719 | if (ba_done) { | |
720 | fsp->state |= FC_SRB_ABORTED; | |
721 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
722 | ||
723 | if (fsp->wait_for_comp) | |
724 | complete(&fsp->tm_done); | |
725 | else | |
726 | fc_fcp_complete_locked(fsp); | |
727 | } | |
728 | } | |
729 | ||
34f42a07 | 730 | /** |
3a3b42bf | 731 | * fc_fcp_recv() - Reveive an FCP frame |
34f42a07 | 732 | * @seq: The sequence the frame is on |
3a3b42bf | 733 | * @fp: The received frame |
34f42a07 | 734 | * @arg: The related FCP packet |
42e9a92f | 735 | * |
3a3b42bf RL |
736 | * Context: Called from Soft IRQ context. Can not be called |
737 | * holding the FCP packet list lock. | |
42e9a92f RL |
738 | */ |
739 | static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
740 | { | |
741 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
a29e7646 | 742 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
743 | struct fc_frame_header *fh; |
744 | struct fcp_txrdy *dd; | |
745 | u8 r_ctl; | |
746 | int rc = 0; | |
747 | ||
c46be11a VD |
748 | if (IS_ERR(fp)) { |
749 | fc_fcp_error(fsp, fp); | |
750 | return; | |
751 | } | |
42e9a92f RL |
752 | |
753 | fh = fc_frame_header_get(fp); | |
754 | r_ctl = fh->fh_r_ctl; | |
42e9a92f | 755 | |
1c4bfe63 | 756 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
757 | goto out; |
758 | if (fc_fcp_lock_pkt(fsp)) | |
759 | goto out; | |
760 | fsp->last_pkt_time = jiffies; | |
761 | ||
762 | if (fh->fh_type == FC_TYPE_BLS) { | |
763 | fc_fcp_abts_resp(fsp, fp); | |
764 | goto unlock; | |
765 | } | |
766 | ||
767 | if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) | |
768 | goto unlock; | |
769 | ||
770 | if (r_ctl == FC_RCTL_DD_DATA_DESC) { | |
771 | /* | |
772 | * received XFER RDY from the target | |
773 | * need to send data to the target | |
774 | */ | |
775 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
776 | dd = fc_frame_payload_get(fp, sizeof(*dd)); | |
777 | WARN_ON(!dd); | |
778 | ||
779 | rc = fc_fcp_send_data(fsp, seq, | |
780 | (size_t) ntohl(dd->ft_data_ro), | |
781 | (size_t) ntohl(dd->ft_burst_len)); | |
782 | if (!rc) | |
783 | seq->rec_data = fsp->xfer_len; | |
42e9a92f RL |
784 | } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { |
785 | /* | |
786 | * received a DATA frame | |
787 | * next we will copy the data to the system buffer | |
788 | */ | |
789 | WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ | |
790 | fc_fcp_recv_data(fsp, fp); | |
791 | seq->rec_data = fsp->xfer_contig_end; | |
792 | } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { | |
793 | WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); | |
794 | ||
795 | fc_fcp_resp(fsp, fp); | |
796 | } else { | |
7414705e | 797 | FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); |
42e9a92f RL |
798 | } |
799 | unlock: | |
800 | fc_fcp_unlock_pkt(fsp); | |
801 | out: | |
802 | fc_frame_free(fp); | |
42e9a92f RL |
803 | } |
804 | ||
3a3b42bf RL |
805 | /** |
806 | * fc_fcp_resp() - Handler for FCP responses | |
807 | * @fsp: The FCP packet the response is for | |
808 | * @fp: The response frame | |
809 | */ | |
42e9a92f RL |
810 | static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
811 | { | |
812 | struct fc_frame_header *fh; | |
813 | struct fcp_resp *fc_rp; | |
814 | struct fcp_resp_ext *rp_ex; | |
815 | struct fcp_resp_rsp_info *fc_rp_info; | |
816 | u32 plen; | |
817 | u32 expected_len; | |
818 | u32 respl = 0; | |
819 | u32 snsl = 0; | |
820 | u8 flags = 0; | |
821 | ||
822 | plen = fr_len(fp); | |
823 | fh = (struct fc_frame_header *)fr_hdr(fp); | |
824 | if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) | |
825 | goto len_err; | |
826 | plen -= sizeof(*fh); | |
827 | fc_rp = (struct fcp_resp *)(fh + 1); | |
828 | fsp->cdb_status = fc_rp->fr_status; | |
829 | flags = fc_rp->fr_flags; | |
830 | fsp->scsi_comp_flags = flags; | |
831 | expected_len = fsp->data_len; | |
832 | ||
b277d2aa YZ |
833 | /* if ddp, update xfer len */ |
834 | fc_fcp_ddp_done(fsp); | |
835 | ||
42e9a92f RL |
836 | if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { |
837 | rp_ex = (void *)(fc_rp + 1); | |
838 | if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { | |
839 | if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) | |
840 | goto len_err; | |
841 | fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); | |
842 | if (flags & FCP_RSP_LEN_VAL) { | |
843 | respl = ntohl(rp_ex->fr_rsp_len); | |
844 | if (respl != sizeof(*fc_rp_info)) | |
845 | goto len_err; | |
846 | if (fsp->wait_for_comp) { | |
847 | /* Abuse cdb_status for rsp code */ | |
848 | fsp->cdb_status = fc_rp_info->rsp_code; | |
849 | complete(&fsp->tm_done); | |
850 | /* | |
851 | * tmfs will not have any scsi cmd so | |
852 | * exit here | |
853 | */ | |
854 | return; | |
63ac4bbf | 855 | } |
42e9a92f RL |
856 | } |
857 | if (flags & FCP_SNS_LEN_VAL) { | |
858 | snsl = ntohl(rp_ex->fr_sns_len); | |
859 | if (snsl > SCSI_SENSE_BUFFERSIZE) | |
860 | snsl = SCSI_SENSE_BUFFERSIZE; | |
861 | memcpy(fsp->cmd->sense_buffer, | |
862 | (char *)fc_rp_info + respl, snsl); | |
863 | } | |
864 | } | |
865 | if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { | |
866 | if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) | |
867 | goto len_err; | |
868 | if (flags & FCP_RESID_UNDER) { | |
869 | fsp->scsi_resid = ntohl(rp_ex->fr_resid); | |
870 | /* | |
871 | * The cmnd->underflow is the minimum number of | |
872 | * bytes that must be transfered for this | |
873 | * command. Provided a sense condition is not | |
874 | * present, make sure the actual amount | |
875 | * transferred is at least the underflow value | |
876 | * or fail. | |
877 | */ | |
878 | if (!(flags & FCP_SNS_LEN_VAL) && | |
879 | (fc_rp->fr_status == 0) && | |
880 | (scsi_bufflen(fsp->cmd) - | |
881 | fsp->scsi_resid) < fsp->cmd->underflow) | |
882 | goto err; | |
883 | expected_len -= fsp->scsi_resid; | |
884 | } else { | |
885 | fsp->status_code = FC_ERROR; | |
886 | } | |
887 | } | |
888 | } | |
889 | fsp->state |= FC_SRB_RCV_STATUS; | |
890 | ||
891 | /* | |
892 | * Check for missing or extra data frames. | |
893 | */ | |
894 | if (unlikely(fsp->xfer_len != expected_len)) { | |
895 | if (fsp->xfer_len < expected_len) { | |
896 | /* | |
897 | * Some data may be queued locally, | |
898 | * Wait a at least one jiffy to see if it is delivered. | |
899 | * If this expires without data, we may do SRR. | |
900 | */ | |
901 | fc_fcp_timer_set(fsp, 2); | |
902 | return; | |
903 | } | |
904 | fsp->status_code = FC_DATA_OVRRUN; | |
ce8b5df0 | 905 | FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " |
7414705e RL |
906 | "len %x, data len %x\n", |
907 | fsp->rport->port_id, | |
908 | fsp->xfer_len, expected_len, fsp->data_len); | |
42e9a92f RL |
909 | } |
910 | fc_fcp_complete_locked(fsp); | |
911 | return; | |
912 | ||
913 | len_err: | |
7414705e RL |
914 | FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " |
915 | "snsl %u\n", flags, fr_len(fp), respl, snsl); | |
42e9a92f RL |
916 | err: |
917 | fsp->status_code = FC_ERROR; | |
918 | fc_fcp_complete_locked(fsp); | |
919 | } | |
920 | ||
921 | /** | |
3a3b42bf RL |
922 | * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the |
923 | * fcp_pkt lock held | |
924 | * @fsp: The FCP packet to be completed | |
42e9a92f RL |
925 | * |
926 | * This function may sleep if a timer is pending. The packet lock must be | |
927 | * held, and the host lock must not be held. | |
928 | */ | |
929 | static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) | |
930 | { | |
3a3b42bf | 931 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
932 | struct fc_seq *seq; |
933 | struct fc_exch *ep; | |
934 | u32 f_ctl; | |
935 | ||
936 | if (fsp->state & FC_SRB_ABORT_PENDING) | |
937 | return; | |
938 | ||
939 | if (fsp->state & FC_SRB_ABORTED) { | |
940 | if (!fsp->status_code) | |
941 | fsp->status_code = FC_CMD_ABORTED; | |
942 | } else { | |
943 | /* | |
944 | * Test for transport underrun, independent of response | |
945 | * underrun status. | |
946 | */ | |
947 | if (fsp->xfer_len < fsp->data_len && !fsp->io_status && | |
948 | (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || | |
949 | fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) { | |
950 | fsp->status_code = FC_DATA_UNDRUN; | |
1c9fbafc | 951 | fsp->io_status = 0; |
42e9a92f RL |
952 | } |
953 | } | |
954 | ||
955 | seq = fsp->seq_ptr; | |
956 | if (seq) { | |
957 | fsp->seq_ptr = NULL; | |
958 | if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { | |
959 | struct fc_frame *conf_frame; | |
960 | struct fc_seq *csp; | |
961 | ||
3a3b42bf | 962 | csp = lport->tt.seq_start_next(seq); |
c46be11a | 963 | conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); |
42e9a92f RL |
964 | if (conf_frame) { |
965 | f_ctl = FC_FC_SEQ_INIT; | |
966 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
967 | ep = fc_seq_exch(seq); | |
968 | fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, | |
969 | ep->did, ep->sid, | |
970 | FC_TYPE_FCP, f_ctl, 0); | |
3a3b42bf | 971 | lport->tt.seq_send(lport, csp, conf_frame); |
42e9a92f RL |
972 | } |
973 | } | |
3a3b42bf | 974 | lport->tt.exch_done(seq); |
42e9a92f | 975 | } |
d889b30a YZ |
976 | /* |
977 | * Some resets driven by SCSI are not I/Os and do not have | |
978 | * SCSI commands associated with the requests. We should not | |
979 | * call I/O completion if we do not have a SCSI command. | |
980 | */ | |
981 | if (fsp->cmd) | |
982 | fc_io_compl(fsp); | |
42e9a92f RL |
983 | } |
984 | ||
3a3b42bf RL |
985 | /** |
986 | * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt | |
987 | * @fsp: The FCP packet whose exchanges should be canceled | |
988 | * @error: The reason for the cancellation | |
989 | */ | |
42e9a92f RL |
990 | static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) |
991 | { | |
3a3b42bf | 992 | struct fc_lport *lport = fsp->lp; |
42e9a92f RL |
993 | |
994 | if (fsp->seq_ptr) { | |
3a3b42bf | 995 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
996 | fsp->seq_ptr = NULL; |
997 | } | |
998 | fsp->status_code = error; | |
999 | } | |
1000 | ||
1001 | /** | |
3a3b42bf RL |
1002 | * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port |
1003 | * @lport: The local port whose exchanges should be canceled | |
1004 | * @id: The target's ID | |
1005 | * @lun: The LUN | |
1006 | * @error: The reason for cancellation | |
42e9a92f RL |
1007 | * |
1008 | * If lun or id is -1, they are ignored. | |
1009 | */ | |
3a3b42bf | 1010 | static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, |
42e9a92f RL |
1011 | unsigned int lun, int error) |
1012 | { | |
3a3b42bf | 1013 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
1014 | struct fc_fcp_pkt *fsp; |
1015 | struct scsi_cmnd *sc_cmd; | |
1016 | unsigned long flags; | |
1017 | ||
c1ecb90a | 1018 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1019 | restart: |
1020 | list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { | |
1021 | sc_cmd = fsp->cmd; | |
1022 | if (id != -1 && scmd_id(sc_cmd) != id) | |
1023 | continue; | |
1024 | ||
1025 | if (lun != -1 && sc_cmd->device->lun != lun) | |
1026 | continue; | |
1027 | ||
1028 | fc_fcp_pkt_hold(fsp); | |
c1ecb90a | 1029 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1030 | |
1031 | if (!fc_fcp_lock_pkt(fsp)) { | |
1032 | fc_fcp_cleanup_cmd(fsp, error); | |
1033 | fc_io_compl(fsp); | |
1034 | fc_fcp_unlock_pkt(fsp); | |
1035 | } | |
1036 | ||
1037 | fc_fcp_pkt_release(fsp); | |
c1ecb90a | 1038 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1039 | /* |
1040 | * while we dropped the lock multiple pkts could | |
1041 | * have been released, so we have to start over. | |
1042 | */ | |
1043 | goto restart; | |
1044 | } | |
c1ecb90a | 1045 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
1046 | } |
1047 | ||
3a3b42bf RL |
1048 | /** |
1049 | * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port | |
1050 | * @lport: The local port whose exchanges are to be aborted | |
1051 | */ | |
1052 | static void fc_fcp_abort_io(struct fc_lport *lport) | |
42e9a92f | 1053 | { |
3a3b42bf | 1054 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); |
42e9a92f RL |
1055 | } |
1056 | ||
1057 | /** | |
3a3b42bf RL |
1058 | * fc_fcp_pkt_send() - Send a fcp_pkt |
1059 | * @lport: The local port to send the FCP packet on | |
1060 | * @fsp: The FCP packet to send | |
42e9a92f | 1061 | * |
3a3b42bf | 1062 | * Return: Zero for success and -1 for failure |
c1ecb90a | 1063 | * Locks: Called without locks held |
42e9a92f | 1064 | */ |
3a3b42bf | 1065 | static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) |
42e9a92f | 1066 | { |
3a3b42bf | 1067 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
c1ecb90a | 1068 | unsigned long flags; |
42e9a92f RL |
1069 | int rc; |
1070 | ||
1071 | fsp->cmd->SCp.ptr = (char *)fsp; | |
1072 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1073 | fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; | |
1074 | ||
1075 | int_to_scsilun(fsp->cmd->device->lun, | |
1076 | (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1077 | memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); | |
42e9a92f | 1078 | |
c1ecb90a CL |
1079 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
1080 | list_add_tail(&fsp->list, &si->scsi_pkt_queue); | |
1081 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); | |
3a3b42bf | 1082 | rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); |
c1ecb90a CL |
1083 | if (unlikely(rc)) { |
1084 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f | 1085 | list_del(&fsp->list); |
c1ecb90a CL |
1086 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
1087 | } | |
42e9a92f RL |
1088 | |
1089 | return rc; | |
1090 | } | |
1091 | ||
e0883a3c | 1092 | /** |
1093 | * get_fsp_rec_tov() - Helper function to get REC_TOV | |
1094 | * @fsp: the FCP packet | |
1095 | */ | |
1096 | static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) | |
1097 | { | |
1098 | struct fc_rport *rport; | |
1099 | struct fc_rport_libfc_priv *rpriv; | |
1100 | ||
1101 | rport = fsp->rport; | |
1102 | rpriv = rport->dd_data; | |
1103 | ||
1104 | return rpriv->e_d_tov + REC_TOV_CONST; | |
1105 | } | |
1106 | ||
3a3b42bf RL |
1107 | /** |
1108 | * fc_fcp_cmd_send() - Send a FCP command | |
1109 | * @lport: The local port to send the command on | |
1110 | * @fsp: The FCP packet the command is on | |
1111 | * @resp: The handler for the response | |
1112 | */ | |
1113 | static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, | |
42e9a92f RL |
1114 | void (*resp)(struct fc_seq *, |
1115 | struct fc_frame *fp, | |
1116 | void *arg)) | |
1117 | { | |
1118 | struct fc_frame *fp; | |
1119 | struct fc_seq *seq; | |
1120 | struct fc_rport *rport; | |
3a3b42bf | 1121 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1122 | const size_t len = sizeof(fsp->cdb_cmd); |
1123 | int rc = 0; | |
e0883a3c | 1124 | unsigned int rec_tov; |
42e9a92f RL |
1125 | |
1126 | if (fc_fcp_lock_pkt(fsp)) | |
1127 | return 0; | |
1128 | ||
c46be11a | 1129 | fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); |
42e9a92f RL |
1130 | if (!fp) { |
1131 | rc = -1; | |
1132 | goto unlock; | |
1133 | } | |
1134 | ||
1135 | memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); | |
b277d2aa | 1136 | fr_fsp(fp) = fsp; |
42e9a92f RL |
1137 | rport = fsp->rport; |
1138 | fsp->max_payload = rport->maxframe_size; | |
3a3b42bf | 1139 | rpriv = rport->dd_data; |
42e9a92f RL |
1140 | |
1141 | fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, | |
7b2787ec | 1142 | rpriv->local_port->port_id, FC_TYPE_FCP, |
24f089e2 | 1143 | FC_FCTL_REQ, 0); |
42e9a92f | 1144 | |
3a3b42bf RL |
1145 | seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, |
1146 | fsp, 0); | |
42e9a92f | 1147 | if (!seq) { |
42e9a92f RL |
1148 | rc = -1; |
1149 | goto unlock; | |
1150 | } | |
1151 | fsp->last_pkt_time = jiffies; | |
1152 | fsp->seq_ptr = seq; | |
1153 | fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ | |
1154 | ||
e0883a3c | 1155 | rec_tov = get_fsp_rec_tov(fsp); |
1156 | ||
42e9a92f | 1157 | setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); |
e0883a3c | 1158 | |
05fee645 | 1159 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
e0883a3c | 1160 | fc_fcp_timer_set(fsp, rec_tov); |
05fee645 | 1161 | |
42e9a92f RL |
1162 | unlock: |
1163 | fc_fcp_unlock_pkt(fsp); | |
1164 | return rc; | |
1165 | } | |
1166 | ||
3a3b42bf RL |
1167 | /** |
1168 | * fc_fcp_error() - Handler for FCP layer errors | |
1169 | * @fsp: The FCP packet the error is on | |
1170 | * @fp: The frame that has errored | |
42e9a92f RL |
1171 | */ |
1172 | static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1173 | { | |
1174 | int error = PTR_ERR(fp); | |
1175 | ||
1176 | if (fc_fcp_lock_pkt(fsp)) | |
1177 | return; | |
1178 | ||
7414705e | 1179 | if (error == -FC_EX_CLOSED) { |
42e9a92f RL |
1180 | fc_fcp_retry_cmd(fsp); |
1181 | goto unlock; | |
42e9a92f | 1182 | } |
7414705e | 1183 | |
42e9a92f RL |
1184 | /* |
1185 | * clear abort pending, because the lower layer | |
1186 | * decided to force completion. | |
1187 | */ | |
1188 | fsp->state &= ~FC_SRB_ABORT_PENDING; | |
1189 | fsp->status_code = FC_CMD_PLOGO; | |
1190 | fc_fcp_complete_locked(fsp); | |
1191 | unlock: | |
1192 | fc_fcp_unlock_pkt(fsp); | |
1193 | } | |
1194 | ||
3a3b42bf RL |
1195 | /** |
1196 | * fc_fcp_pkt_abort() - Abort a fcp_pkt | |
1197 | * @fsp: The FCP packet to abort on | |
1198 | * | |
1199 | * Called to send an abort and then wait for abort completion | |
42e9a92f | 1200 | */ |
c340111d | 1201 | static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) |
42e9a92f RL |
1202 | { |
1203 | int rc = FAILED; | |
1204 | ||
1205 | if (fc_fcp_send_abort(fsp)) | |
1206 | return FAILED; | |
1207 | ||
1208 | init_completion(&fsp->tm_done); | |
1209 | fsp->wait_for_comp = 1; | |
1210 | ||
1211 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1212 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1213 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1214 | fsp->wait_for_comp = 0; | |
1215 | ||
1216 | if (!rc) { | |
7414705e | 1217 | FC_FCP_DBG(fsp, "target abort cmd failed\n"); |
42e9a92f RL |
1218 | rc = FAILED; |
1219 | } else if (fsp->state & FC_SRB_ABORTED) { | |
7414705e | 1220 | FC_FCP_DBG(fsp, "target abort cmd passed\n"); |
42e9a92f RL |
1221 | rc = SUCCESS; |
1222 | fc_fcp_complete_locked(fsp); | |
1223 | } | |
1224 | ||
1225 | return rc; | |
1226 | } | |
1227 | ||
3a3b42bf RL |
1228 | /** |
1229 | * fc_lun_reset_send() - Send LUN reset command | |
1230 | * @data: The FCP packet that identifies the LUN to be reset | |
42e9a92f RL |
1231 | */ |
1232 | static void fc_lun_reset_send(unsigned long data) | |
1233 | { | |
1234 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
3a3b42bf | 1235 | struct fc_lport *lport = fsp->lp; |
e0883a3c | 1236 | unsigned int rec_tov; |
1237 | ||
3a3b42bf | 1238 | if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { |
42e9a92f RL |
1239 | if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) |
1240 | return; | |
1241 | if (fc_fcp_lock_pkt(fsp)) | |
1242 | return; | |
e0883a3c | 1243 | rec_tov = get_fsp_rec_tov(fsp); |
42e9a92f | 1244 | setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); |
e0883a3c | 1245 | fc_fcp_timer_set(fsp, rec_tov); |
42e9a92f RL |
1246 | fc_fcp_unlock_pkt(fsp); |
1247 | } | |
1248 | } | |
1249 | ||
3a3b42bf RL |
1250 | /** |
1251 | * fc_lun_reset() - Send a LUN RESET command to a device | |
1252 | * and wait for the reply | |
1253 | * @lport: The local port to sent the comand on | |
1254 | * @fsp: The FCP packet that identifies the LUN to be reset | |
1255 | * @id: The SCSI command ID | |
1256 | * @lun: The LUN ID to be reset | |
42e9a92f | 1257 | */ |
3a3b42bf | 1258 | static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, |
42e9a92f RL |
1259 | unsigned int id, unsigned int lun) |
1260 | { | |
1261 | int rc; | |
1262 | ||
1263 | fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); | |
1264 | fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; | |
1265 | int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun); | |
1266 | ||
1267 | fsp->wait_for_comp = 1; | |
1268 | init_completion(&fsp->tm_done); | |
1269 | ||
1270 | fc_lun_reset_send((unsigned long)fsp); | |
1271 | ||
1272 | /* | |
1273 | * wait for completion of reset | |
1274 | * after that make sure all commands are terminated | |
1275 | */ | |
1276 | rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); | |
1277 | ||
1278 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1279 | fsp->state |= FC_SRB_COMPL; | |
1280 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1281 | ||
1282 | del_timer_sync(&fsp->timer); | |
1283 | ||
1284 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1285 | if (fsp->seq_ptr) { | |
3a3b42bf | 1286 | lport->tt.exch_done(fsp->seq_ptr); |
42e9a92f RL |
1287 | fsp->seq_ptr = NULL; |
1288 | } | |
1289 | fsp->wait_for_comp = 0; | |
1290 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1291 | ||
1292 | if (!rc) { | |
3a3b42bf | 1293 | FC_SCSI_DBG(lport, "lun reset failed\n"); |
42e9a92f RL |
1294 | return FAILED; |
1295 | } | |
1296 | ||
1297 | /* cdb_status holds the tmf's rsp code */ | |
1298 | if (fsp->cdb_status != FCP_TMF_CMPL) | |
1299 | return FAILED; | |
1300 | ||
3a3b42bf RL |
1301 | FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); |
1302 | fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); | |
42e9a92f RL |
1303 | return SUCCESS; |
1304 | } | |
1305 | ||
3a3b42bf RL |
1306 | /** |
1307 | * fc_tm_done() - Task Managment response handler | |
1308 | * @seq: The sequence that the response is on | |
1309 | * @fp: The response frame | |
1310 | * @arg: The FCP packet the response is for | |
42e9a92f RL |
1311 | */ |
1312 | static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1313 | { | |
1314 | struct fc_fcp_pkt *fsp = arg; | |
1315 | struct fc_frame_header *fh; | |
1316 | ||
1317 | if (IS_ERR(fp)) { | |
1318 | /* | |
1319 | * If there is an error just let it timeout or wait | |
1320 | * for TMF to be aborted if it timedout. | |
1321 | * | |
1322 | * scsi-eh will escalate for when either happens. | |
1323 | */ | |
b5fe5e95 | 1324 | goto out; |
42e9a92f RL |
1325 | } |
1326 | ||
1327 | if (fc_fcp_lock_pkt(fsp)) | |
b5fe5e95 | 1328 | goto out; |
42e9a92f RL |
1329 | |
1330 | /* | |
1331 | * raced with eh timeout handler. | |
1332 | */ | |
b5fe5e95 YZ |
1333 | if (!fsp->seq_ptr || !fsp->wait_for_comp) |
1334 | goto out_unlock; | |
42e9a92f RL |
1335 | |
1336 | fh = fc_frame_header_get(fp); | |
1337 | if (fh->fh_type != FC_TYPE_BLS) | |
1338 | fc_fcp_resp(fsp, fp); | |
1339 | fsp->seq_ptr = NULL; | |
1340 | fsp->lp->tt.exch_done(seq); | |
b5fe5e95 | 1341 | out_unlock: |
42e9a92f | 1342 | fc_fcp_unlock_pkt(fsp); |
b5fe5e95 YZ |
1343 | out: |
1344 | fc_frame_free(fp); | |
42e9a92f RL |
1345 | } |
1346 | ||
3a3b42bf RL |
1347 | /** |
1348 | * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port | |
1349 | * @lport: The local port to be cleaned up | |
1350 | */ | |
1351 | static void fc_fcp_cleanup(struct fc_lport *lport) | |
42e9a92f | 1352 | { |
3a3b42bf | 1353 | fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); |
42e9a92f RL |
1354 | } |
1355 | ||
3a3b42bf RL |
1356 | /** |
1357 | * fc_fcp_timeout() - Handler for fcp_pkt timeouts | |
1358 | * @data: The FCP packet that has timed out | |
42e9a92f | 1359 | * |
3a3b42bf RL |
1360 | * If REC is supported then just issue it and return. The REC exchange will |
1361 | * complete or time out and recovery can continue at that point. Otherwise, | |
1362 | * if the response has been received without all the data it has been | |
1363 | * ER_TIMEOUT since the response was received. If the response has not been | |
1364 | * received we see if data was received recently. If it has been then we | |
1365 | * continue waiting, otherwise, we abort the command. | |
42e9a92f RL |
1366 | */ |
1367 | static void fc_fcp_timeout(unsigned long data) | |
1368 | { | |
1369 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; | |
1370 | struct fc_rport *rport = fsp->rport; | |
3a3b42bf | 1371 | struct fc_rport_libfc_priv *rpriv = rport->dd_data; |
42e9a92f RL |
1372 | |
1373 | if (fc_fcp_lock_pkt(fsp)) | |
1374 | return; | |
1375 | ||
1376 | if (fsp->cdb_cmd.fc_tm_flags) | |
1377 | goto unlock; | |
1378 | ||
1379 | fsp->state |= FC_SRB_FCP_PROCESSING_TMO; | |
1380 | ||
3a3b42bf | 1381 | if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) |
42e9a92f | 1382 | fc_fcp_rec(fsp); |
42e9a92f RL |
1383 | else if (fsp->state & FC_SRB_RCV_STATUS) |
1384 | fc_fcp_complete_locked(fsp); | |
1385 | else | |
ac17ea8d | 1386 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1387 | fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; |
1388 | unlock: | |
1389 | fc_fcp_unlock_pkt(fsp); | |
1390 | } | |
1391 | ||
3a3b42bf RL |
1392 | /** |
1393 | * fc_fcp_rec() - Send a REC ELS request | |
1394 | * @fsp: The FCP packet to send the REC request on | |
42e9a92f RL |
1395 | */ |
1396 | static void fc_fcp_rec(struct fc_fcp_pkt *fsp) | |
1397 | { | |
3a3b42bf | 1398 | struct fc_lport *lport; |
42e9a92f RL |
1399 | struct fc_frame *fp; |
1400 | struct fc_rport *rport; | |
3a3b42bf | 1401 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f | 1402 | |
3a3b42bf | 1403 | lport = fsp->lp; |
42e9a92f | 1404 | rport = fsp->rport; |
3a3b42bf RL |
1405 | rpriv = rport->dd_data; |
1406 | if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { | |
42e9a92f | 1407 | fsp->status_code = FC_HRD_ERROR; |
1c9fbafc | 1408 | fsp->io_status = 0; |
42e9a92f RL |
1409 | fc_fcp_complete_locked(fsp); |
1410 | return; | |
1411 | } | |
e0883a3c | 1412 | |
c46be11a | 1413 | fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); |
42e9a92f RL |
1414 | if (!fp) |
1415 | goto retry; | |
1416 | ||
1417 | fr_seq(fp) = fsp->seq_ptr; | |
1418 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, | |
7b2787ec | 1419 | rpriv->local_port->port_id, FC_TYPE_ELS, |
24f089e2 | 1420 | FC_FCTL_REQ, 0); |
3a3b42bf RL |
1421 | if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, |
1422 | fc_fcp_rec_resp, fsp, | |
3a91090f | 1423 | 2 * lport->r_a_tov)) { |
42e9a92f RL |
1424 | fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ |
1425 | return; | |
1426 | } | |
42e9a92f RL |
1427 | retry: |
1428 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
3a91090f | 1429 | fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); |
42e9a92f | 1430 | else |
ac17ea8d | 1431 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1432 | } |
1433 | ||
3a3b42bf RL |
1434 | /** |
1435 | * fc_fcp_rec_resp() - Handler for REC ELS responses | |
1436 | * @seq: The sequence the response is on | |
1437 | * @fp: The response frame | |
1438 | * @arg: The FCP packet the response is on | |
1439 | * | |
1440 | * If the response is a reject then the scsi layer will handle | |
1441 | * the timeout. If the response is a LS_ACC then if the I/O was not completed | |
1442 | * set the timeout and return. If the I/O was completed then complete the | |
1443 | * exchange and tell the SCSI layer. | |
42e9a92f RL |
1444 | */ |
1445 | static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1446 | { | |
1447 | struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; | |
1448 | struct fc_els_rec_acc *recp; | |
1449 | struct fc_els_ls_rjt *rjt; | |
1450 | u32 e_stat; | |
1451 | u8 opcode; | |
1452 | u32 offset; | |
1453 | enum dma_data_direction data_dir; | |
1454 | enum fc_rctl r_ctl; | |
3a3b42bf | 1455 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1456 | |
1457 | if (IS_ERR(fp)) { | |
1458 | fc_fcp_rec_error(fsp, fp); | |
1459 | return; | |
1460 | } | |
1461 | ||
1462 | if (fc_fcp_lock_pkt(fsp)) | |
1463 | goto out; | |
1464 | ||
1465 | fsp->recov_retry = 0; | |
1466 | opcode = fc_frame_payload_op(fp); | |
1467 | if (opcode == ELS_LS_RJT) { | |
1468 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); | |
1469 | switch (rjt->er_reason) { | |
1470 | default: | |
7414705e RL |
1471 | FC_FCP_DBG(fsp, "device %x unexpected REC reject " |
1472 | "reason %d expl %d\n", | |
1473 | fsp->rport->port_id, rjt->er_reason, | |
1474 | rjt->er_explan); | |
42e9a92f RL |
1475 | /* fall through */ |
1476 | case ELS_RJT_UNSUP: | |
7414705e | 1477 | FC_FCP_DBG(fsp, "device does not support REC\n"); |
3a3b42bf | 1478 | rpriv = fsp->rport->dd_data; |
42e9a92f RL |
1479 | /* |
1480 | * if we do not spport RECs or got some bogus | |
1481 | * reason then resetup timer so we check for | |
1482 | * making progress. | |
1483 | */ | |
3a3b42bf | 1484 | rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; |
42e9a92f RL |
1485 | break; |
1486 | case ELS_RJT_LOGIC: | |
1487 | case ELS_RJT_UNAB: | |
1488 | /* | |
1489 | * If no data transfer, the command frame got dropped | |
1490 | * so we just retry. If data was transferred, we | |
1491 | * lost the response but the target has no record, | |
1492 | * so we abort and retry. | |
1493 | */ | |
1494 | if (rjt->er_explan == ELS_EXPL_OXID_RXID && | |
1495 | fsp->xfer_len == 0) { | |
1496 | fc_fcp_retry_cmd(fsp); | |
1497 | break; | |
1498 | } | |
ac17ea8d | 1499 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1500 | break; |
1501 | } | |
1502 | } else if (opcode == ELS_LS_ACC) { | |
1503 | if (fsp->state & FC_SRB_ABORTED) | |
1504 | goto unlock_out; | |
1505 | ||
1506 | data_dir = fsp->cmd->sc_data_direction; | |
1507 | recp = fc_frame_payload_get(fp, sizeof(*recp)); | |
1508 | offset = ntohl(recp->reca_fc4value); | |
1509 | e_stat = ntohl(recp->reca_e_stat); | |
1510 | ||
1511 | if (e_stat & ESB_ST_COMPLETE) { | |
1512 | ||
1513 | /* | |
1514 | * The exchange is complete. | |
1515 | * | |
1516 | * For output, we must've lost the response. | |
1517 | * For input, all data must've been sent. | |
1518 | * We lost may have lost the response | |
1519 | * (and a confirmation was requested) and maybe | |
1520 | * some data. | |
1521 | * | |
1522 | * If all data received, send SRR | |
1523 | * asking for response. If partial data received, | |
1524 | * or gaps, SRR requests data at start of gap. | |
1525 | * Recovery via SRR relies on in-order-delivery. | |
1526 | */ | |
1527 | if (data_dir == DMA_TO_DEVICE) { | |
1528 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1529 | } else if (fsp->xfer_contig_end == offset) { | |
1530 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1531 | } else { | |
1532 | offset = fsp->xfer_contig_end; | |
1533 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1534 | } | |
1535 | fc_fcp_srr(fsp, r_ctl, offset); | |
1536 | } else if (e_stat & ESB_ST_SEQ_INIT) { | |
e0883a3c | 1537 | unsigned int rec_tov = get_fsp_rec_tov(fsp); |
42e9a92f RL |
1538 | /* |
1539 | * The remote port has the initiative, so just | |
1540 | * keep waiting for it to complete. | |
1541 | */ | |
e0883a3c | 1542 | fc_fcp_timer_set(fsp, rec_tov); |
42e9a92f RL |
1543 | } else { |
1544 | ||
1545 | /* | |
1546 | * The exchange is incomplete, we have seq. initiative. | |
1547 | * Lost response with requested confirmation, | |
1548 | * lost confirmation, lost transfer ready or | |
1549 | * lost write data. | |
1550 | * | |
1551 | * For output, if not all data was received, ask | |
1552 | * for transfer ready to be repeated. | |
1553 | * | |
1554 | * If we received or sent all the data, send SRR to | |
1555 | * request response. | |
1556 | * | |
1557 | * If we lost a response, we may have lost some read | |
1558 | * data as well. | |
1559 | */ | |
1560 | r_ctl = FC_RCTL_DD_SOL_DATA; | |
1561 | if (data_dir == DMA_TO_DEVICE) { | |
1562 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1563 | if (offset < fsp->data_len) | |
1564 | r_ctl = FC_RCTL_DD_DATA_DESC; | |
1565 | } else if (offset == fsp->xfer_contig_end) { | |
1566 | r_ctl = FC_RCTL_DD_CMD_STATUS; | |
1567 | } else if (fsp->xfer_contig_end < offset) { | |
1568 | offset = fsp->xfer_contig_end; | |
1569 | } | |
1570 | fc_fcp_srr(fsp, r_ctl, offset); | |
1571 | } | |
1572 | } | |
1573 | unlock_out: | |
1574 | fc_fcp_unlock_pkt(fsp); | |
1575 | out: | |
1576 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1577 | fc_frame_free(fp); | |
1578 | } | |
1579 | ||
3a3b42bf RL |
1580 | /** |
1581 | * fc_fcp_rec_error() - Handler for REC errors | |
1582 | * @fsp: The FCP packet the error is on | |
1583 | * @fp: The REC frame | |
42e9a92f RL |
1584 | */ |
1585 | static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) | |
1586 | { | |
1587 | int error = PTR_ERR(fp); | |
1588 | ||
1589 | if (fc_fcp_lock_pkt(fsp)) | |
1590 | goto out; | |
1591 | ||
1592 | switch (error) { | |
1593 | case -FC_EX_CLOSED: | |
1594 | fc_fcp_retry_cmd(fsp); | |
1595 | break; | |
1596 | ||
1597 | default: | |
ce8b5df0 | 1598 | FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", |
7414705e | 1599 | fsp, fsp->rport->port_id, error); |
42e9a92f RL |
1600 | fsp->status_code = FC_CMD_PLOGO; |
1601 | /* fall through */ | |
1602 | ||
1603 | case -FC_EX_TIMEOUT: | |
1604 | /* | |
1605 | * Assume REC or LS_ACC was lost. | |
1606 | * The exchange manager will have aborted REC, so retry. | |
1607 | */ | |
ce8b5df0 | 1608 | FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", |
7414705e RL |
1609 | fsp->rport->port_id, error, fsp->recov_retry, |
1610 | FC_MAX_RECOV_RETRY); | |
42e9a92f RL |
1611 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) |
1612 | fc_fcp_rec(fsp); | |
1613 | else | |
ac17ea8d | 1614 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1615 | break; |
1616 | } | |
1617 | fc_fcp_unlock_pkt(fsp); | |
1618 | out: | |
1619 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ | |
1620 | } | |
1621 | ||
3a3b42bf | 1622 | /** |
5c12c418 VD |
1623 | * fc_fcp_recovery() - Handler for fcp_pkt recovery |
1624 | * @fsp: The FCP pkt that needs to be aborted | |
42e9a92f | 1625 | */ |
ac17ea8d | 1626 | static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) |
42e9a92f | 1627 | { |
ac17ea8d | 1628 | fsp->status_code = code; |
42e9a92f RL |
1629 | fsp->cdb_status = 0; |
1630 | fsp->io_status = 0; | |
1631 | /* | |
1632 | * if this fails then we let the scsi command timer fire and | |
1633 | * scsi-ml escalate. | |
1634 | */ | |
1635 | fc_fcp_send_abort(fsp); | |
1636 | } | |
1637 | ||
3a3b42bf RL |
1638 | /** |
1639 | * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) | |
1640 | * @fsp: The FCP packet the SRR is to be sent on | |
1641 | * @r_ctl: The R_CTL field for the SRR request | |
42e9a92f RL |
1642 | * This is called after receiving status but insufficient data, or |
1643 | * when expecting status but the request has timed out. | |
1644 | */ | |
1645 | static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) | |
1646 | { | |
3a3b42bf | 1647 | struct fc_lport *lport = fsp->lp; |
42e9a92f | 1648 | struct fc_rport *rport; |
3a3b42bf | 1649 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1650 | struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); |
1651 | struct fc_seq *seq; | |
1652 | struct fcp_srr *srr; | |
1653 | struct fc_frame *fp; | |
1654 | u8 cdb_op; | |
e0883a3c | 1655 | unsigned int rec_tov; |
42e9a92f RL |
1656 | |
1657 | rport = fsp->rport; | |
3a3b42bf | 1658 | rpriv = rport->dd_data; |
42e9a92f RL |
1659 | cdb_op = fsp->cdb_cmd.fc_cdb[0]; |
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); |
3a3b42bf | 1681 | seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, |
e0883a3c | 1682 | fsp, jiffies_to_msecs(rec_tov)); |
8f550f93 | 1683 | if (!seq) |
42e9a92f | 1684 | goto retry; |
8f550f93 | 1685 | |
42e9a92f RL |
1686 | fsp->recov_seq = seq; |
1687 | fsp->xfer_len = offset; | |
1688 | fsp->xfer_contig_end = offset; | |
1689 | fsp->state &= ~FC_SRB_RCV_STATUS; | |
1690 | fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ | |
1691 | return; | |
1692 | retry: | |
1693 | fc_fcp_retry_cmd(fsp); | |
1694 | } | |
1695 | ||
3a3b42bf RL |
1696 | /** |
1697 | * fc_fcp_srr_resp() - Handler for SRR response | |
1698 | * @seq: The sequence the SRR is on | |
1699 | * @fp: The SRR frame | |
1700 | * @arg: The FCP packet the SRR is on | |
42e9a92f RL |
1701 | */ |
1702 | static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
1703 | { | |
1704 | struct fc_fcp_pkt *fsp = arg; | |
1705 | struct fc_frame_header *fh; | |
e0883a3c | 1706 | unsigned int rec_tov; |
42e9a92f RL |
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 | ||
1729 | fsp->recov_seq = NULL; | |
1730 | switch (fc_frame_payload_op(fp)) { | |
1731 | case ELS_LS_ACC: | |
1732 | fsp->recov_retry = 0; | |
e0883a3c | 1733 | rec_tov = get_fsp_rec_tov(fsp); |
1734 | fc_fcp_timer_set(fsp, rec_tov); | |
42e9a92f RL |
1735 | break; |
1736 | case ELS_LS_RJT: | |
1737 | default: | |
ac17ea8d | 1738 | fc_fcp_recovery(fsp, FC_ERROR); |
42e9a92f RL |
1739 | break; |
1740 | } | |
1741 | fc_fcp_unlock_pkt(fsp); | |
1742 | fsp->lp->tt.exch_done(seq); | |
1743 | out: | |
1744 | fc_frame_free(fp); | |
1745 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1746 | } | |
1747 | ||
3a3b42bf RL |
1748 | /** |
1749 | * fc_fcp_srr_error() - Handler for SRR errors | |
1750 | * @fsp: The FCP packet that the SRR error is on | |
1751 | * @fp: The SRR frame | |
1752 | */ | |
42e9a92f RL |
1753 | static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) |
1754 | { | |
1755 | if (fc_fcp_lock_pkt(fsp)) | |
1756 | goto out; | |
1757 | fsp->lp->tt.exch_done(fsp->recov_seq); | |
1758 | fsp->recov_seq = NULL; | |
1759 | switch (PTR_ERR(fp)) { | |
1760 | case -FC_EX_TIMEOUT: | |
1761 | if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) | |
1762 | fc_fcp_rec(fsp); | |
1763 | else | |
ac17ea8d | 1764 | fc_fcp_recovery(fsp, FC_TIMED_OUT); |
42e9a92f RL |
1765 | break; |
1766 | case -FC_EX_CLOSED: /* e.g., link failure */ | |
1767 | /* fall through */ | |
1768 | default: | |
1769 | fc_fcp_retry_cmd(fsp); | |
1770 | break; | |
1771 | } | |
1772 | fc_fcp_unlock_pkt(fsp); | |
1773 | out: | |
1774 | fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ | |
1775 | } | |
1776 | ||
3a3b42bf RL |
1777 | /** |
1778 | * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready | |
1779 | * @lport: The local port to be checked | |
1780 | */ | |
1781 | static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) | |
42e9a92f RL |
1782 | { |
1783 | /* lock ? */ | |
3a3b42bf RL |
1784 | return (lport->state == LPORT_ST_READY) && |
1785 | lport->link_up && !lport->qfull; | |
42e9a92f RL |
1786 | } |
1787 | ||
1788 | /** | |
3a3b42bf RL |
1789 | * fc_queuecommand() - The queuecommand function of the SCSI template |
1790 | * @cmd: The scsi_cmnd to be executed | |
1791 | * @done: The callback function to be called when the scsi_cmnd is complete | |
42e9a92f | 1792 | * |
3a3b42bf RL |
1793 | * This is the i/o strategy routine, called by the SCSI layer. This routine |
1794 | * is called with the host_lock held. | |
42e9a92f | 1795 | */ |
f281233d | 1796 | static int fc_queuecommand_lck(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *)) |
42e9a92f | 1797 | { |
3a3b42bf | 1798 | struct fc_lport *lport; |
42e9a92f RL |
1799 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); |
1800 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 1801 | struct fc_rport_libfc_priv *rpriv; |
42e9a92f RL |
1802 | int rval; |
1803 | int rc = 0; | |
1804 | struct fcoe_dev_stats *stats; | |
1805 | ||
3a3b42bf | 1806 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f RL |
1807 | |
1808 | rval = fc_remote_port_chkready(rport); | |
1809 | if (rval) { | |
1810 | sc_cmd->result = rval; | |
1811 | done(sc_cmd); | |
be948fc3 | 1812 | return 0; |
42e9a92f | 1813 | } |
be948fc3 | 1814 | spin_unlock_irq(lport->host->host_lock); |
42e9a92f RL |
1815 | |
1816 | if (!*(struct fc_remote_port **)rport->dd_data) { | |
1817 | /* | |
1818 | * rport is transitioning from blocked/deleted to | |
1819 | * online | |
1820 | */ | |
1821 | sc_cmd->result = DID_IMM_RETRY << 16; | |
1822 | done(sc_cmd); | |
1823 | goto out; | |
1824 | } | |
1825 | ||
3a3b42bf | 1826 | rpriv = rport->dd_data; |
42e9a92f | 1827 | |
3a3b42bf | 1828 | if (!fc_fcp_lport_queue_ready(lport)) { |
84c3e1ad VD |
1829 | if (lport->qfull) |
1830 | fc_fcp_can_queue_ramp_down(lport); | |
42e9a92f RL |
1831 | rc = SCSI_MLQUEUE_HOST_BUSY; |
1832 | goto out; | |
1833 | } | |
1834 | ||
3a3b42bf | 1835 | fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); |
42e9a92f RL |
1836 | if (fsp == NULL) { |
1837 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1838 | goto out; | |
1839 | } | |
1840 | ||
1841 | /* | |
1842 | * build the libfc request pkt | |
1843 | */ | |
1844 | fsp->cmd = sc_cmd; /* save the cmd */ | |
3a3b42bf | 1845 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f | 1846 | fsp->rport = rport; /* set the remote port ptr */ |
5e472d07 | 1847 | fsp->xfer_ddp = FC_XID_UNKNOWN; |
42e9a92f RL |
1848 | sc_cmd->scsi_done = done; |
1849 | ||
1850 | /* | |
1851 | * set up the transfer length | |
1852 | */ | |
1853 | fsp->data_len = scsi_bufflen(sc_cmd); | |
1854 | fsp->xfer_len = 0; | |
1855 | ||
1856 | /* | |
1857 | * setup the data direction | |
1858 | */ | |
f018b73a | 1859 | stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
42e9a92f RL |
1860 | if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { |
1861 | fsp->req_flags = FC_SRB_READ; | |
1862 | stats->InputRequests++; | |
e90ff5ef | 1863 | stats->InputMegabytes += fsp->data_len; |
42e9a92f RL |
1864 | } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { |
1865 | fsp->req_flags = FC_SRB_WRITE; | |
1866 | stats->OutputRequests++; | |
e90ff5ef | 1867 | stats->OutputMegabytes += fsp->data_len; |
42e9a92f RL |
1868 | } else { |
1869 | fsp->req_flags = 0; | |
1870 | stats->ControlRequests++; | |
1871 | } | |
f018b73a | 1872 | put_cpu(); |
42e9a92f | 1873 | |
42e9a92f RL |
1874 | init_timer(&fsp->timer); |
1875 | fsp->timer.data = (unsigned long)fsp; | |
1876 | ||
1877 | /* | |
1878 | * send it to the lower layer | |
1879 | * if we get -1 return then put the request in the pending | |
1880 | * queue. | |
1881 | */ | |
3a3b42bf | 1882 | rval = fc_fcp_pkt_send(lport, fsp); |
42e9a92f RL |
1883 | if (rval != 0) { |
1884 | fsp->state = FC_SRB_FREE; | |
1885 | fc_fcp_pkt_release(fsp); | |
1886 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1887 | } | |
1888 | out: | |
c1ecb90a | 1889 | spin_lock_irq(lport->host->host_lock); |
42e9a92f RL |
1890 | return rc; |
1891 | } | |
f281233d JG |
1892 | |
1893 | DEF_SCSI_QCMD(fc_queuecommand) | |
42e9a92f RL |
1894 | EXPORT_SYMBOL(fc_queuecommand); |
1895 | ||
1896 | /** | |
3a3b42bf RL |
1897 | * fc_io_compl() - Handle responses for completed commands |
1898 | * @fsp: The FCP packet that is complete | |
42e9a92f | 1899 | * |
3a3b42bf | 1900 | * Translates fcp_pkt errors to a Linux SCSI errors. |
42e9a92f RL |
1901 | * The fcp packet lock must be held when calling. |
1902 | */ | |
1903 | static void fc_io_compl(struct fc_fcp_pkt *fsp) | |
1904 | { | |
1905 | struct fc_fcp_internal *si; | |
1906 | struct scsi_cmnd *sc_cmd; | |
3a3b42bf | 1907 | struct fc_lport *lport; |
42e9a92f RL |
1908 | unsigned long flags; |
1909 | ||
b277d2aa YZ |
1910 | /* release outstanding ddp context */ |
1911 | fc_fcp_ddp_done(fsp); | |
1912 | ||
42e9a92f RL |
1913 | fsp->state |= FC_SRB_COMPL; |
1914 | if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { | |
1915 | spin_unlock_bh(&fsp->scsi_pkt_lock); | |
1916 | del_timer_sync(&fsp->timer); | |
1917 | spin_lock_bh(&fsp->scsi_pkt_lock); | |
1918 | } | |
1919 | ||
3a3b42bf RL |
1920 | lport = fsp->lp; |
1921 | si = fc_get_scsi_internal(lport); | |
42e9a92f RL |
1922 | |
1923 | /* | |
84c3e1ad VD |
1924 | * if can_queue ramp down is done then try can_queue ramp up |
1925 | * since commands are completing now. | |
42e9a92f | 1926 | */ |
84c3e1ad VD |
1927 | if (si->last_can_queue_ramp_down_time) |
1928 | fc_fcp_can_queue_ramp_up(lport); | |
42e9a92f RL |
1929 | |
1930 | sc_cmd = fsp->cmd; | |
42e9a92f RL |
1931 | CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; |
1932 | switch (fsp->status_code) { | |
1933 | case FC_COMPLETE: | |
1934 | if (fsp->cdb_status == 0) { | |
1935 | /* | |
1936 | * good I/O status | |
1937 | */ | |
1938 | sc_cmd->result = DID_OK << 16; | |
1939 | if (fsp->scsi_resid) | |
1940 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; | |
42e9a92f RL |
1941 | } else { |
1942 | /* | |
1943 | * transport level I/O was ok but scsi | |
1944 | * has non zero status | |
1945 | */ | |
1946 | sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; | |
1947 | } | |
1948 | break; | |
1949 | case FC_ERROR: | |
b3ef990c RL |
1950 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1951 | "due to FC_ERROR\n"); | |
42e9a92f RL |
1952 | sc_cmd->result = DID_ERROR << 16; |
1953 | break; | |
1954 | case FC_DATA_UNDRUN: | |
26d9cab5 | 1955 | if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { |
42e9a92f RL |
1956 | /* |
1957 | * scsi status is good but transport level | |
26d9cab5 | 1958 | * underrun. |
42e9a92f | 1959 | */ |
b3ef990c RL |
1960 | if (fsp->state & FC_SRB_RCV_STATUS) { |
1961 | sc_cmd->result = DID_OK << 16; | |
1962 | } else { | |
1963 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" | |
1964 | " due to FC_DATA_UNDRUN (trans)\n"); | |
1965 | sc_cmd->result = DID_ERROR << 16; | |
1966 | } | |
42e9a92f RL |
1967 | } else { |
1968 | /* | |
1969 | * scsi got underrun, this is an error | |
1970 | */ | |
b3ef990c RL |
1971 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1972 | "due to FC_DATA_UNDRUN (scsi)\n"); | |
42e9a92f RL |
1973 | CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; |
1974 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; | |
1975 | } | |
1976 | break; | |
1977 | case FC_DATA_OVRRUN: | |
1978 | /* | |
1979 | * overrun is an error | |
1980 | */ | |
b3ef990c RL |
1981 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
1982 | "due to FC_DATA_OVRRUN\n"); | |
42e9a92f RL |
1983 | sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; |
1984 | break; | |
1985 | case FC_CMD_ABORTED: | |
b3ef990c | 1986 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
ac17ea8d | 1987 | "due to FC_CMD_ABORTED\n"); |
d5e6054a | 1988 | sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; |
42e9a92f | 1989 | break; |
42e9a92f | 1990 | case FC_CMD_RESET: |
ac17ea8d | 1991 | FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " |
1992 | "due to FC_CMD_RESET\n"); | |
42e9a92f RL |
1993 | sc_cmd->result = (DID_RESET << 16); |
1994 | break; | |
1995 | case FC_HRD_ERROR: | |
ac17ea8d | 1996 | FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " |
1997 | "due to FC_HRD_ERROR\n"); | |
42e9a92f RL |
1998 | sc_cmd->result = (DID_NO_CONNECT << 16); |
1999 | break; | |
ac17ea8d | 2000 | case FC_CRC_ERROR: |
2001 | FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " | |
2002 | "due to FC_CRC_ERROR\n"); | |
2003 | sc_cmd->result = (DID_PARITY << 16); | |
2004 | break; | |
2005 | case FC_TIMED_OUT: | |
2006 | FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " | |
2007 | "due to FC_TIMED_OUT\n"); | |
2008 | sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; | |
2009 | break; | |
42e9a92f | 2010 | default: |
b3ef990c RL |
2011 | FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " |
2012 | "due to unknown error\n"); | |
42e9a92f RL |
2013 | sc_cmd->result = (DID_ERROR << 16); |
2014 | break; | |
2015 | } | |
2016 | ||
75eee725 VD |
2017 | if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) |
2018 | sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); | |
e0d93c5b | 2019 | |
c1ecb90a | 2020 | spin_lock_irqsave(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2021 | list_del(&fsp->list); |
2022 | sc_cmd->SCp.ptr = NULL; | |
8b7ac2bb | 2023 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f | 2024 | sc_cmd->scsi_done(sc_cmd); |
42e9a92f RL |
2025 | |
2026 | /* release ref from initial allocation in queue command */ | |
2027 | fc_fcp_pkt_release(fsp); | |
2028 | } | |
2029 | ||
42e9a92f | 2030 | /** |
34f42a07 | 2031 | * fc_eh_abort() - Abort a command |
3a3b42bf | 2032 | * @sc_cmd: The SCSI command to abort |
42e9a92f | 2033 | * |
3a3b42bf RL |
2034 | * From SCSI host template. |
2035 | * Send an ABTS to the target device and wait for the response. | |
42e9a92f RL |
2036 | */ |
2037 | int fc_eh_abort(struct scsi_cmnd *sc_cmd) | |
2038 | { | |
2039 | struct fc_fcp_pkt *fsp; | |
3a3b42bf | 2040 | struct fc_lport *lport; |
8b7ac2bb | 2041 | struct fc_fcp_internal *si; |
42e9a92f RL |
2042 | int rc = FAILED; |
2043 | unsigned long flags; | |
2044 | ||
3a3b42bf RL |
2045 | lport = shost_priv(sc_cmd->device->host); |
2046 | if (lport->state != LPORT_ST_READY) | |
42e9a92f | 2047 | return rc; |
3a3b42bf | 2048 | else if (!lport->link_up) |
42e9a92f RL |
2049 | return rc; |
2050 | ||
8b7ac2bb VD |
2051 | si = fc_get_scsi_internal(lport); |
2052 | spin_lock_irqsave(&si->scsi_queue_lock, flags); | |
42e9a92f RL |
2053 | fsp = CMD_SP(sc_cmd); |
2054 | if (!fsp) { | |
2055 | /* command completed while scsi eh was setting up */ | |
3c2c3bf2 | 2056 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2057 | return SUCCESS; |
2058 | } | |
2059 | /* grab a ref so the fsp and sc_cmd cannot be relased from under us */ | |
2060 | fc_fcp_pkt_hold(fsp); | |
8b7ac2bb | 2061 | spin_unlock_irqrestore(&si->scsi_queue_lock, flags); |
42e9a92f RL |
2062 | |
2063 | if (fc_fcp_lock_pkt(fsp)) { | |
2064 | /* completed while we were waiting for timer to be deleted */ | |
2065 | rc = SUCCESS; | |
2066 | goto release_pkt; | |
2067 | } | |
2068 | ||
c340111d | 2069 | rc = fc_fcp_pkt_abort(fsp); |
42e9a92f RL |
2070 | fc_fcp_unlock_pkt(fsp); |
2071 | ||
2072 | release_pkt: | |
2073 | fc_fcp_pkt_release(fsp); | |
2074 | return rc; | |
2075 | } | |
2076 | EXPORT_SYMBOL(fc_eh_abort); | |
2077 | ||
2078 | /** | |
3a3b42bf RL |
2079 | * fc_eh_device_reset() - Reset a single LUN |
2080 | * @sc_cmd: The SCSI command which identifies the device whose | |
2081 | * LUN is to be reset | |
42e9a92f | 2082 | * |
3a3b42bf | 2083 | * Set from SCSI host template. |
42e9a92f RL |
2084 | */ |
2085 | int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) | |
2086 | { | |
3a3b42bf | 2087 | struct fc_lport *lport; |
42e9a92f RL |
2088 | struct fc_fcp_pkt *fsp; |
2089 | struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); | |
2090 | int rc = FAILED; | |
42e9a92f RL |
2091 | int rval; |
2092 | ||
2093 | rval = fc_remote_port_chkready(rport); | |
2094 | if (rval) | |
2095 | goto out; | |
2096 | ||
3a3b42bf | 2097 | lport = shost_priv(sc_cmd->device->host); |
42e9a92f | 2098 | |
3a3b42bf | 2099 | if (lport->state != LPORT_ST_READY) |
42e9a92f RL |
2100 | return rc; |
2101 | ||
ce8b5df0 | 2102 | FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); |
7414705e | 2103 | |
3a3b42bf | 2104 | fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); |
42e9a92f | 2105 | if (fsp == NULL) { |
7414705e | 2106 | printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); |
42e9a92f RL |
2107 | goto out; |
2108 | } | |
2109 | ||
2110 | /* | |
2111 | * Build the libfc request pkt. Do not set the scsi cmnd, because | |
2112 | * the sc passed in is not setup for execution like when sent | |
2113 | * through the queuecommand callout. | |
2114 | */ | |
3a3b42bf | 2115 | fsp->lp = lport; /* save the softc ptr */ |
42e9a92f RL |
2116 | fsp->rport = rport; /* set the remote port ptr */ |
2117 | ||
2118 | /* | |
2119 | * flush outstanding commands | |
2120 | */ | |
3a3b42bf | 2121 | rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); |
42e9a92f RL |
2122 | fsp->state = FC_SRB_FREE; |
2123 | fc_fcp_pkt_release(fsp); | |
2124 | ||
2125 | out: | |
2126 | return rc; | |
2127 | } | |
2128 | EXPORT_SYMBOL(fc_eh_device_reset); | |
2129 | ||
2130 | /** | |
3a3b42bf RL |
2131 | * fc_eh_host_reset() - Reset a Scsi_Host. |
2132 | * @sc_cmd: The SCSI command that identifies the SCSI host to be reset | |
42e9a92f RL |
2133 | */ |
2134 | int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) | |
2135 | { | |
2136 | struct Scsi_Host *shost = sc_cmd->device->host; | |
3a3b42bf | 2137 | struct fc_lport *lport = shost_priv(shost); |
42e9a92f RL |
2138 | unsigned long wait_tmo; |
2139 | ||
3a3b42bf | 2140 | FC_SCSI_DBG(lport, "Resetting host\n"); |
7414705e | 2141 | |
3a3b42bf | 2142 | lport->tt.lport_reset(lport); |
42e9a92f | 2143 | wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; |
3a3b42bf RL |
2144 | while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, |
2145 | wait_tmo)) | |
42e9a92f RL |
2146 | msleep(1000); |
2147 | ||
3a3b42bf | 2148 | if (fc_fcp_lport_queue_ready(lport)) { |
7414705e | 2149 | shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " |
7b2787ec | 2150 | "on port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2151 | return SUCCESS; |
2152 | } else { | |
7414705e | 2153 | shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " |
ce8b5df0 | 2154 | "port (%6.6x) is not ready.\n", |
7b2787ec | 2155 | lport->port_id); |
42e9a92f RL |
2156 | return FAILED; |
2157 | } | |
2158 | } | |
2159 | EXPORT_SYMBOL(fc_eh_host_reset); | |
2160 | ||
2161 | /** | |
3a3b42bf RL |
2162 | * fc_slave_alloc() - Configure the queue depth of a Scsi_Host |
2163 | * @sdev: The SCSI device that identifies the SCSI host | |
42e9a92f RL |
2164 | * |
2165 | * Configures queue depth based on host's cmd_per_len. If not set | |
2166 | * then we use the libfc default. | |
2167 | */ | |
2168 | int fc_slave_alloc(struct scsi_device *sdev) | |
2169 | { | |
2170 | struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); | |
42e9a92f RL |
2171 | |
2172 | if (!rport || fc_remote_port_chkready(rport)) | |
2173 | return -ENXIO; | |
2174 | ||
14caf44c VD |
2175 | if (sdev->tagged_supported) |
2176 | scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH); | |
2177 | else | |
2178 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), | |
2179 | FC_FCP_DFLT_QUEUE_DEPTH); | |
2180 | ||
42e9a92f RL |
2181 | return 0; |
2182 | } | |
2183 | EXPORT_SYMBOL(fc_slave_alloc); | |
2184 | ||
3a3b42bf RL |
2185 | /** |
2186 | * fc_change_queue_depth() - Change a device's queue depth | |
2187 | * @sdev: The SCSI device whose queue depth is to change | |
2188 | * @qdepth: The new queue depth | |
2189 | * @reason: The resason for the change | |
2190 | */ | |
e881a172 | 2191 | int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) |
42e9a92f | 2192 | { |
5c20848a MC |
2193 | switch (reason) { |
2194 | case SCSI_QDEPTH_DEFAULT: | |
2195 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2196 | break; | |
2197 | case SCSI_QDEPTH_QFULL: | |
2198 | scsi_track_queue_full(sdev, qdepth); | |
2199 | break; | |
229b8d72 VD |
2200 | case SCSI_QDEPTH_RAMP_UP: |
2201 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); | |
2202 | break; | |
5c20848a | 2203 | default: |
e881a172 | 2204 | return -EOPNOTSUPP; |
5c20848a | 2205 | } |
42e9a92f RL |
2206 | return sdev->queue_depth; |
2207 | } | |
2208 | EXPORT_SYMBOL(fc_change_queue_depth); | |
2209 | ||
3a3b42bf RL |
2210 | /** |
2211 | * fc_change_queue_type() - Change a device's queue type | |
2212 | * @sdev: The SCSI device whose queue depth is to change | |
2213 | * @tag_type: Identifier for queue type | |
2214 | */ | |
42e9a92f RL |
2215 | int fc_change_queue_type(struct scsi_device *sdev, int tag_type) |
2216 | { | |
2217 | if (sdev->tagged_supported) { | |
2218 | scsi_set_tag_type(sdev, tag_type); | |
2219 | if (tag_type) | |
2220 | scsi_activate_tcq(sdev, sdev->queue_depth); | |
2221 | else | |
2222 | scsi_deactivate_tcq(sdev, sdev->queue_depth); | |
2223 | } else | |
2224 | tag_type = 0; | |
2225 | ||
2226 | return tag_type; | |
2227 | } | |
2228 | EXPORT_SYMBOL(fc_change_queue_type); | |
2229 | ||
3a3b42bf RL |
2230 | /** |
2231 | * fc_fcp_destory() - Tear down the FCP layer for a given local port | |
2232 | * @lport: The local port that no longer needs the FCP layer | |
2233 | */ | |
2234 | void fc_fcp_destroy(struct fc_lport *lport) | |
42e9a92f | 2235 | { |
3a3b42bf | 2236 | struct fc_fcp_internal *si = fc_get_scsi_internal(lport); |
42e9a92f RL |
2237 | |
2238 | if (!list_empty(&si->scsi_pkt_queue)) | |
7414705e | 2239 | printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " |
7b2787ec | 2240 | "port (%6.6x)\n", lport->port_id); |
42e9a92f RL |
2241 | |
2242 | mempool_destroy(si->scsi_pkt_pool); | |
2243 | kfree(si); | |
3a3b42bf | 2244 | lport->scsi_priv = NULL; |
42e9a92f RL |
2245 | } |
2246 | EXPORT_SYMBOL(fc_fcp_destroy); | |
2247 | ||
93e6d5ab RL |
2248 | int fc_setup_fcp() |
2249 | { | |
2250 | int rc = 0; | |
2251 | ||
2252 | scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", | |
2253 | sizeof(struct fc_fcp_pkt), | |
2254 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
2255 | if (!scsi_pkt_cachep) { | |
2256 | printk(KERN_ERR "libfc: Unable to allocate SRB cache, " | |
2257 | "module load failed!"); | |
2258 | rc = -ENOMEM; | |
2259 | } | |
2260 | ||
2261 | return rc; | |
2262 | } | |
2263 | ||
2264 | void fc_destroy_fcp() | |
2265 | { | |
2266 | if (scsi_pkt_cachep) | |
2267 | kmem_cache_destroy(scsi_pkt_cachep); | |
2268 | } | |
2269 | ||
3a3b42bf RL |
2270 | /** |
2271 | * fc_fcp_init() - Initialize the FCP layer for a local port | |
2272 | * @lport: The local port to initialize the exchange layer for | |
2273 | */ | |
2274 | int fc_fcp_init(struct fc_lport *lport) | |
42e9a92f RL |
2275 | { |
2276 | int rc; | |
2277 | struct fc_fcp_internal *si; | |
2278 | ||
3a3b42bf RL |
2279 | if (!lport->tt.fcp_cmd_send) |
2280 | lport->tt.fcp_cmd_send = fc_fcp_cmd_send; | |
42e9a92f | 2281 | |
3a3b42bf RL |
2282 | if (!lport->tt.fcp_cleanup) |
2283 | lport->tt.fcp_cleanup = fc_fcp_cleanup; | |
42e9a92f | 2284 | |
3a3b42bf RL |
2285 | if (!lport->tt.fcp_abort_io) |
2286 | lport->tt.fcp_abort_io = fc_fcp_abort_io; | |
42e9a92f RL |
2287 | |
2288 | si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); | |
2289 | if (!si) | |
2290 | return -ENOMEM; | |
3a3b42bf | 2291 | lport->scsi_priv = si; |
84c3e1ad | 2292 | si->max_can_queue = lport->host->can_queue; |
42e9a92f | 2293 | INIT_LIST_HEAD(&si->scsi_pkt_queue); |
c1ecb90a | 2294 | spin_lock_init(&si->scsi_queue_lock); |
42e9a92f RL |
2295 | |
2296 | si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); | |
2297 | if (!si->scsi_pkt_pool) { | |
2298 | rc = -ENOMEM; | |
2299 | goto free_internal; | |
2300 | } | |
2301 | return 0; | |
2302 | ||
2303 | free_internal: | |
2304 | kfree(si); | |
2305 | return rc; | |
2306 | } | |
2307 | EXPORT_SYMBOL(fc_fcp_init); |