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7675d2aaa0f77fa97275a82bd23562f24211b452
[deliverable/linux.git] / drivers / target / target_core_sbc.c
1 /*
2 * SCSI Block Commands (SBC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@kernel.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/ratelimit.h>
26 #include <linux/crc-t10dif.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_tcq.h>
30
31 #include <target/target_core_base.h>
32 #include <target/target_core_backend.h>
33 #include <target/target_core_fabric.h>
34
35 #include "target_core_internal.h"
36 #include "target_core_ua.h"
37 #include "target_core_alua.h"
38
39 static sense_reason_t
40 sbc_emulate_readcapacity(struct se_cmd *cmd)
41 {
42 struct se_device *dev = cmd->se_dev;
43 unsigned char *cdb = cmd->t_task_cdb;
44 unsigned long long blocks_long = dev->transport->get_blocks(dev);
45 unsigned char *rbuf;
46 unsigned char buf[8];
47 u32 blocks;
48
49 /*
50 * SBC-2 says:
51 * If the PMI bit is set to zero and the LOGICAL BLOCK
52 * ADDRESS field is not set to zero, the device server shall
53 * terminate the command with CHECK CONDITION status with
54 * the sense key set to ILLEGAL REQUEST and the additional
55 * sense code set to INVALID FIELD IN CDB.
56 *
57 * In SBC-3, these fields are obsolete, but some SCSI
58 * compliance tests actually check this, so we might as well
59 * follow SBC-2.
60 */
61 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
62 return TCM_INVALID_CDB_FIELD;
63
64 if (blocks_long >= 0x00000000ffffffff)
65 blocks = 0xffffffff;
66 else
67 blocks = (u32)blocks_long;
68
69 buf[0] = (blocks >> 24) & 0xff;
70 buf[1] = (blocks >> 16) & 0xff;
71 buf[2] = (blocks >> 8) & 0xff;
72 buf[3] = blocks & 0xff;
73 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
74 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
75 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
76 buf[7] = dev->dev_attrib.block_size & 0xff;
77
78 rbuf = transport_kmap_data_sg(cmd);
79 if (rbuf) {
80 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
81 transport_kunmap_data_sg(cmd);
82 }
83
84 target_complete_cmd(cmd, GOOD);
85 return 0;
86 }
87
88 static sense_reason_t
89 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
90 {
91 struct se_device *dev = cmd->se_dev;
92 struct se_session *sess = cmd->se_sess;
93 unsigned char *rbuf;
94 unsigned char buf[32];
95 unsigned long long blocks = dev->transport->get_blocks(dev);
96
97 memset(buf, 0, sizeof(buf));
98 buf[0] = (blocks >> 56) & 0xff;
99 buf[1] = (blocks >> 48) & 0xff;
100 buf[2] = (blocks >> 40) & 0xff;
101 buf[3] = (blocks >> 32) & 0xff;
102 buf[4] = (blocks >> 24) & 0xff;
103 buf[5] = (blocks >> 16) & 0xff;
104 buf[6] = (blocks >> 8) & 0xff;
105 buf[7] = blocks & 0xff;
106 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
107 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
108 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
109 buf[11] = dev->dev_attrib.block_size & 0xff;
110 /*
111 * Set P_TYPE and PROT_EN bits for DIF support
112 */
113 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
114 if (dev->dev_attrib.pi_prot_type)
115 buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1;
116 }
117
118 if (dev->transport->get_lbppbe)
119 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
120
121 if (dev->transport->get_alignment_offset_lbas) {
122 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
123 buf[14] = (lalba >> 8) & 0x3f;
124 buf[15] = lalba & 0xff;
125 }
126
127 /*
128 * Set Thin Provisioning Enable bit following sbc3r22 in section
129 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
130 */
131 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
132 buf[14] |= 0x80;
133
134 rbuf = transport_kmap_data_sg(cmd);
135 if (rbuf) {
136 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
137 transport_kunmap_data_sg(cmd);
138 }
139
140 target_complete_cmd(cmd, GOOD);
141 return 0;
142 }
143
144 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
145 {
146 u32 num_blocks;
147
148 if (cmd->t_task_cdb[0] == WRITE_SAME)
149 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
150 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
151 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
152 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
153 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
154
155 /*
156 * Use the explicit range when non zero is supplied, otherwise calculate
157 * the remaining range based on ->get_blocks() - starting LBA.
158 */
159 if (num_blocks)
160 return num_blocks;
161
162 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
163 cmd->t_task_lba + 1;
164 }
165 EXPORT_SYMBOL(sbc_get_write_same_sectors);
166
167 static sense_reason_t
168 sbc_emulate_noop(struct se_cmd *cmd)
169 {
170 target_complete_cmd(cmd, GOOD);
171 return 0;
172 }
173
174 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
175 {
176 return cmd->se_dev->dev_attrib.block_size * sectors;
177 }
178
179 static inline u32 transport_get_sectors_6(unsigned char *cdb)
180 {
181 /*
182 * Use 8-bit sector value. SBC-3 says:
183 *
184 * A TRANSFER LENGTH field set to zero specifies that 256
185 * logical blocks shall be written. Any other value
186 * specifies the number of logical blocks that shall be
187 * written.
188 */
189 return cdb[4] ? : 256;
190 }
191
192 static inline u32 transport_get_sectors_10(unsigned char *cdb)
193 {
194 return (u32)(cdb[7] << 8) + cdb[8];
195 }
196
197 static inline u32 transport_get_sectors_12(unsigned char *cdb)
198 {
199 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
200 }
201
202 static inline u32 transport_get_sectors_16(unsigned char *cdb)
203 {
204 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
205 (cdb[12] << 8) + cdb[13];
206 }
207
208 /*
209 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
210 */
211 static inline u32 transport_get_sectors_32(unsigned char *cdb)
212 {
213 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
214 (cdb[30] << 8) + cdb[31];
215
216 }
217
218 static inline u32 transport_lba_21(unsigned char *cdb)
219 {
220 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
221 }
222
223 static inline u32 transport_lba_32(unsigned char *cdb)
224 {
225 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
226 }
227
228 static inline unsigned long long transport_lba_64(unsigned char *cdb)
229 {
230 unsigned int __v1, __v2;
231
232 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
233 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
234
235 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
236 }
237
238 /*
239 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
240 */
241 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
242 {
243 unsigned int __v1, __v2;
244
245 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
246 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
247
248 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
249 }
250
251 static sense_reason_t
252 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
253 {
254 unsigned int sectors = sbc_get_write_same_sectors(cmd);
255
256 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
257 pr_err("WRITE_SAME PBDATA and LBDATA"
258 " bits not supported for Block Discard"
259 " Emulation\n");
260 return TCM_UNSUPPORTED_SCSI_OPCODE;
261 }
262 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
263 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
264 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
265 return TCM_INVALID_CDB_FIELD;
266 }
267 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
268 if (flags[0] & 0x10) {
269 pr_warn("WRITE SAME with ANCHOR not supported\n");
270 return TCM_INVALID_CDB_FIELD;
271 }
272 /*
273 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
274 * translated into block discard requests within backend code.
275 */
276 if (flags[0] & 0x08) {
277 if (!ops->execute_write_same_unmap)
278 return TCM_UNSUPPORTED_SCSI_OPCODE;
279
280 cmd->execute_cmd = ops->execute_write_same_unmap;
281 return 0;
282 }
283 if (!ops->execute_write_same)
284 return TCM_UNSUPPORTED_SCSI_OPCODE;
285
286 cmd->execute_cmd = ops->execute_write_same;
287 return 0;
288 }
289
290 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
291 {
292 unsigned char *buf, *addr;
293 struct scatterlist *sg;
294 unsigned int offset;
295 sense_reason_t ret = TCM_NO_SENSE;
296 int i, count;
297 /*
298 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
299 *
300 * 1) read the specified logical block(s);
301 * 2) transfer logical blocks from the data-out buffer;
302 * 3) XOR the logical blocks transferred from the data-out buffer with
303 * the logical blocks read, storing the resulting XOR data in a buffer;
304 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
305 * blocks transferred from the data-out buffer; and
306 * 5) transfer the resulting XOR data to the data-in buffer.
307 */
308 buf = kmalloc(cmd->data_length, GFP_KERNEL);
309 if (!buf) {
310 pr_err("Unable to allocate xor_callback buf\n");
311 return TCM_OUT_OF_RESOURCES;
312 }
313 /*
314 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
315 * into the locally allocated *buf
316 */
317 sg_copy_to_buffer(cmd->t_data_sg,
318 cmd->t_data_nents,
319 buf,
320 cmd->data_length);
321
322 /*
323 * Now perform the XOR against the BIDI read memory located at
324 * cmd->t_mem_bidi_list
325 */
326
327 offset = 0;
328 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
329 addr = kmap_atomic(sg_page(sg));
330 if (!addr) {
331 ret = TCM_OUT_OF_RESOURCES;
332 goto out;
333 }
334
335 for (i = 0; i < sg->length; i++)
336 *(addr + sg->offset + i) ^= *(buf + offset + i);
337
338 offset += sg->length;
339 kunmap_atomic(addr);
340 }
341
342 out:
343 kfree(buf);
344 return ret;
345 }
346
347 static sense_reason_t
348 sbc_execute_rw(struct se_cmd *cmd)
349 {
350 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
351 cmd->data_direction);
352 }
353
354 static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
355 {
356 struct se_device *dev = cmd->se_dev;
357
358 /*
359 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
360 * within target_complete_ok_work() if the command was successfully
361 * sent to the backend driver.
362 */
363 spin_lock_irq(&cmd->t_state_lock);
364 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
365 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
366 spin_unlock_irq(&cmd->t_state_lock);
367
368 /*
369 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
370 * before the original READ I/O submission.
371 */
372 up(&dev->caw_sem);
373
374 return TCM_NO_SENSE;
375 }
376
377 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
378 {
379 struct se_device *dev = cmd->se_dev;
380 struct scatterlist *write_sg = NULL, *sg;
381 unsigned char *buf = NULL, *addr;
382 struct sg_mapping_iter m;
383 unsigned int offset = 0, len;
384 unsigned int nlbas = cmd->t_task_nolb;
385 unsigned int block_size = dev->dev_attrib.block_size;
386 unsigned int compare_len = (nlbas * block_size);
387 sense_reason_t ret = TCM_NO_SENSE;
388 int rc, i;
389
390 /*
391 * Handle early failure in transport_generic_request_failure(),
392 * which will not have taken ->caw_mutex yet..
393 */
394 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
395 return TCM_NO_SENSE;
396 /*
397 * Immediately exit + release dev->caw_sem if command has already
398 * been failed with a non-zero SCSI status.
399 */
400 if (cmd->scsi_status) {
401 pr_err("compare_and_write_callback: non zero scsi_status:"
402 " 0x%02x\n", cmd->scsi_status);
403 goto out;
404 }
405
406 buf = kzalloc(cmd->data_length, GFP_KERNEL);
407 if (!buf) {
408 pr_err("Unable to allocate compare_and_write buf\n");
409 ret = TCM_OUT_OF_RESOURCES;
410 goto out;
411 }
412
413 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
414 GFP_KERNEL);
415 if (!write_sg) {
416 pr_err("Unable to allocate compare_and_write sg\n");
417 ret = TCM_OUT_OF_RESOURCES;
418 goto out;
419 }
420 sg_init_table(write_sg, cmd->t_data_nents);
421 /*
422 * Setup verify and write data payloads from total NumberLBAs.
423 */
424 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
425 cmd->data_length);
426 if (!rc) {
427 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
428 ret = TCM_OUT_OF_RESOURCES;
429 goto out;
430 }
431 /*
432 * Compare against SCSI READ payload against verify payload
433 */
434 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
435 addr = (unsigned char *)kmap_atomic(sg_page(sg));
436 if (!addr) {
437 ret = TCM_OUT_OF_RESOURCES;
438 goto out;
439 }
440
441 len = min(sg->length, compare_len);
442
443 if (memcmp(addr, buf + offset, len)) {
444 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
445 addr, buf + offset);
446 kunmap_atomic(addr);
447 goto miscompare;
448 }
449 kunmap_atomic(addr);
450
451 offset += len;
452 compare_len -= len;
453 if (!compare_len)
454 break;
455 }
456
457 i = 0;
458 len = cmd->t_task_nolb * block_size;
459 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
460 /*
461 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
462 */
463 while (len) {
464 sg_miter_next(&m);
465
466 if (block_size < PAGE_SIZE) {
467 sg_set_page(&write_sg[i], m.page, block_size,
468 block_size);
469 } else {
470 sg_miter_next(&m);
471 sg_set_page(&write_sg[i], m.page, block_size,
472 0);
473 }
474 len -= block_size;
475 i++;
476 }
477 sg_miter_stop(&m);
478 /*
479 * Save the original SGL + nents values before updating to new
480 * assignments, to be released in transport_free_pages() ->
481 * transport_reset_sgl_orig()
482 */
483 cmd->t_data_sg_orig = cmd->t_data_sg;
484 cmd->t_data_sg = write_sg;
485 cmd->t_data_nents_orig = cmd->t_data_nents;
486 cmd->t_data_nents = 1;
487
488 cmd->sam_task_attr = MSG_HEAD_TAG;
489 cmd->transport_complete_callback = compare_and_write_post;
490 /*
491 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
492 * for submitting the adjusted SGL to write instance user-data.
493 */
494 cmd->execute_cmd = sbc_execute_rw;
495
496 spin_lock_irq(&cmd->t_state_lock);
497 cmd->t_state = TRANSPORT_PROCESSING;
498 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
499 spin_unlock_irq(&cmd->t_state_lock);
500
501 __target_execute_cmd(cmd);
502
503 kfree(buf);
504 return ret;
505
506 miscompare:
507 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
508 dev->transport->name);
509 ret = TCM_MISCOMPARE_VERIFY;
510 out:
511 /*
512 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
513 * sbc_compare_and_write() before the original READ I/O submission.
514 */
515 up(&dev->caw_sem);
516 kfree(write_sg);
517 kfree(buf);
518 return ret;
519 }
520
521 static sense_reason_t
522 sbc_compare_and_write(struct se_cmd *cmd)
523 {
524 struct se_device *dev = cmd->se_dev;
525 sense_reason_t ret;
526 int rc;
527 /*
528 * Submit the READ first for COMPARE_AND_WRITE to perform the
529 * comparision using SGLs at cmd->t_bidi_data_sg..
530 */
531 rc = down_interruptible(&dev->caw_sem);
532 if ((rc != 0) || signal_pending(current)) {
533 cmd->transport_complete_callback = NULL;
534 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
535 }
536 /*
537 * Reset cmd->data_length to individual block_size in order to not
538 * confuse backend drivers that depend on this value matching the
539 * size of the I/O being submitted.
540 */
541 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
542
543 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
544 DMA_FROM_DEVICE);
545 if (ret) {
546 cmd->transport_complete_callback = NULL;
547 up(&dev->caw_sem);
548 return ret;
549 }
550 /*
551 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
552 * upon MISCOMPARE, or in compare_and_write_done() upon completion
553 * of WRITE instance user-data.
554 */
555 return TCM_NO_SENSE;
556 }
557
558 static int
559 sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
560 bool is_write, struct se_cmd *cmd)
561 {
562 if (is_write) {
563 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS :
564 TARGET_PROT_DOUT_INSERT;
565 switch (protect) {
566 case 0x0:
567 case 0x3:
568 cmd->prot_checks = 0;
569 break;
570 case 0x1:
571 case 0x5:
572 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
573 if (prot_type == TARGET_DIF_TYPE1_PROT)
574 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
575 break;
576 case 0x2:
577 if (prot_type == TARGET_DIF_TYPE1_PROT)
578 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
579 break;
580 case 0x4:
581 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
582 break;
583 default:
584 pr_err("Unsupported protect field %d\n", protect);
585 return -EINVAL;
586 }
587 } else {
588 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS :
589 TARGET_PROT_DIN_STRIP;
590 switch (protect) {
591 case 0x0:
592 case 0x1:
593 case 0x5:
594 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
595 if (prot_type == TARGET_DIF_TYPE1_PROT)
596 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
597 break;
598 case 0x2:
599 if (prot_type == TARGET_DIF_TYPE1_PROT)
600 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
601 break;
602 case 0x3:
603 cmd->prot_checks = 0;
604 break;
605 case 0x4:
606 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
607 break;
608 default:
609 pr_err("Unsupported protect field %d\n", protect);
610 return -EINVAL;
611 }
612 }
613
614 return 0;
615 }
616
617 static bool
618 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
619 u32 sectors, bool is_write)
620 {
621 u8 protect = cdb[1] >> 5;
622
623 if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto)
624 return true;
625
626 switch (dev->dev_attrib.pi_prot_type) {
627 case TARGET_DIF_TYPE3_PROT:
628 cmd->reftag_seed = 0xffffffff;
629 break;
630 case TARGET_DIF_TYPE2_PROT:
631 if (protect)
632 return false;
633
634 cmd->reftag_seed = cmd->t_task_lba;
635 break;
636 case TARGET_DIF_TYPE1_PROT:
637 cmd->reftag_seed = cmd->t_task_lba;
638 break;
639 case TARGET_DIF_TYPE0_PROT:
640 default:
641 return true;
642 }
643
644 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
645 is_write, cmd))
646 return false;
647
648 cmd->prot_type = dev->dev_attrib.pi_prot_type;
649 cmd->prot_length = dev->prot_length * sectors;
650 pr_debug("%s: prot_type=%d, prot_length=%d prot_op=%d prot_checks=%d\n",
651 __func__, cmd->prot_type, cmd->prot_length,
652 cmd->prot_op, cmd->prot_checks);
653
654 return true;
655 }
656
657 sense_reason_t
658 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
659 {
660 struct se_device *dev = cmd->se_dev;
661 unsigned char *cdb = cmd->t_task_cdb;
662 unsigned int size;
663 u32 sectors = 0;
664 sense_reason_t ret;
665
666 switch (cdb[0]) {
667 case READ_6:
668 sectors = transport_get_sectors_6(cdb);
669 cmd->t_task_lba = transport_lba_21(cdb);
670 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
671 cmd->execute_rw = ops->execute_rw;
672 cmd->execute_cmd = sbc_execute_rw;
673 break;
674 case READ_10:
675 sectors = transport_get_sectors_10(cdb);
676 cmd->t_task_lba = transport_lba_32(cdb);
677
678 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
679 return TCM_UNSUPPORTED_SCSI_OPCODE;
680
681 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
682 cmd->execute_rw = ops->execute_rw;
683 cmd->execute_cmd = sbc_execute_rw;
684 break;
685 case READ_12:
686 sectors = transport_get_sectors_12(cdb);
687 cmd->t_task_lba = transport_lba_32(cdb);
688
689 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
690 return TCM_UNSUPPORTED_SCSI_OPCODE;
691
692 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
693 cmd->execute_rw = ops->execute_rw;
694 cmd->execute_cmd = sbc_execute_rw;
695 break;
696 case READ_16:
697 sectors = transport_get_sectors_16(cdb);
698 cmd->t_task_lba = transport_lba_64(cdb);
699
700 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
701 return TCM_UNSUPPORTED_SCSI_OPCODE;
702
703 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
704 cmd->execute_rw = ops->execute_rw;
705 cmd->execute_cmd = sbc_execute_rw;
706 break;
707 case WRITE_6:
708 sectors = transport_get_sectors_6(cdb);
709 cmd->t_task_lba = transport_lba_21(cdb);
710 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
711 cmd->execute_rw = ops->execute_rw;
712 cmd->execute_cmd = sbc_execute_rw;
713 break;
714 case WRITE_10:
715 case WRITE_VERIFY:
716 sectors = transport_get_sectors_10(cdb);
717 cmd->t_task_lba = transport_lba_32(cdb);
718
719 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
720 return TCM_UNSUPPORTED_SCSI_OPCODE;
721
722 if (cdb[1] & 0x8)
723 cmd->se_cmd_flags |= SCF_FUA;
724 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
725 cmd->execute_rw = ops->execute_rw;
726 cmd->execute_cmd = sbc_execute_rw;
727 break;
728 case WRITE_12:
729 sectors = transport_get_sectors_12(cdb);
730 cmd->t_task_lba = transport_lba_32(cdb);
731
732 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
733 return TCM_UNSUPPORTED_SCSI_OPCODE;
734
735 if (cdb[1] & 0x8)
736 cmd->se_cmd_flags |= SCF_FUA;
737 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
738 cmd->execute_rw = ops->execute_rw;
739 cmd->execute_cmd = sbc_execute_rw;
740 break;
741 case WRITE_16:
742 sectors = transport_get_sectors_16(cdb);
743 cmd->t_task_lba = transport_lba_64(cdb);
744
745 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
746 return TCM_UNSUPPORTED_SCSI_OPCODE;
747
748 if (cdb[1] & 0x8)
749 cmd->se_cmd_flags |= SCF_FUA;
750 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
751 cmd->execute_rw = ops->execute_rw;
752 cmd->execute_cmd = sbc_execute_rw;
753 break;
754 case XDWRITEREAD_10:
755 if (cmd->data_direction != DMA_TO_DEVICE ||
756 !(cmd->se_cmd_flags & SCF_BIDI))
757 return TCM_INVALID_CDB_FIELD;
758 sectors = transport_get_sectors_10(cdb);
759
760 cmd->t_task_lba = transport_lba_32(cdb);
761 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
762
763 /*
764 * Setup BIDI XOR callback to be run after I/O completion.
765 */
766 cmd->execute_rw = ops->execute_rw;
767 cmd->execute_cmd = sbc_execute_rw;
768 cmd->transport_complete_callback = &xdreadwrite_callback;
769 if (cdb[1] & 0x8)
770 cmd->se_cmd_flags |= SCF_FUA;
771 break;
772 case VARIABLE_LENGTH_CMD:
773 {
774 u16 service_action = get_unaligned_be16(&cdb[8]);
775 switch (service_action) {
776 case XDWRITEREAD_32:
777 sectors = transport_get_sectors_32(cdb);
778
779 /*
780 * Use WRITE_32 and READ_32 opcodes for the emulated
781 * XDWRITE_READ_32 logic.
782 */
783 cmd->t_task_lba = transport_lba_64_ext(cdb);
784 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
785
786 /*
787 * Setup BIDI XOR callback to be run during after I/O
788 * completion.
789 */
790 cmd->execute_rw = ops->execute_rw;
791 cmd->execute_cmd = sbc_execute_rw;
792 cmd->transport_complete_callback = &xdreadwrite_callback;
793 if (cdb[1] & 0x8)
794 cmd->se_cmd_flags |= SCF_FUA;
795 break;
796 case WRITE_SAME_32:
797 sectors = transport_get_sectors_32(cdb);
798 if (!sectors) {
799 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
800 " supported\n");
801 return TCM_INVALID_CDB_FIELD;
802 }
803
804 size = sbc_get_size(cmd, 1);
805 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
806
807 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
808 if (ret)
809 return ret;
810 break;
811 default:
812 pr_err("VARIABLE_LENGTH_CMD service action"
813 " 0x%04x not supported\n", service_action);
814 return TCM_UNSUPPORTED_SCSI_OPCODE;
815 }
816 break;
817 }
818 case COMPARE_AND_WRITE:
819 sectors = cdb[13];
820 /*
821 * Currently enforce COMPARE_AND_WRITE for a single sector
822 */
823 if (sectors > 1) {
824 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
825 " than 1\n", sectors);
826 return TCM_INVALID_CDB_FIELD;
827 }
828 /*
829 * Double size because we have two buffers, note that
830 * zero is not an error..
831 */
832 size = 2 * sbc_get_size(cmd, sectors);
833 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
834 cmd->t_task_nolb = sectors;
835 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
836 cmd->execute_rw = ops->execute_rw;
837 cmd->execute_cmd = sbc_compare_and_write;
838 cmd->transport_complete_callback = compare_and_write_callback;
839 break;
840 case READ_CAPACITY:
841 size = READ_CAP_LEN;
842 cmd->execute_cmd = sbc_emulate_readcapacity;
843 break;
844 case SERVICE_ACTION_IN:
845 switch (cmd->t_task_cdb[1] & 0x1f) {
846 case SAI_READ_CAPACITY_16:
847 cmd->execute_cmd = sbc_emulate_readcapacity_16;
848 break;
849 case SAI_REPORT_REFERRALS:
850 cmd->execute_cmd = target_emulate_report_referrals;
851 break;
852 default:
853 pr_err("Unsupported SA: 0x%02x\n",
854 cmd->t_task_cdb[1] & 0x1f);
855 return TCM_INVALID_CDB_FIELD;
856 }
857 size = (cdb[10] << 24) | (cdb[11] << 16) |
858 (cdb[12] << 8) | cdb[13];
859 break;
860 case SYNCHRONIZE_CACHE:
861 case SYNCHRONIZE_CACHE_16:
862 if (cdb[0] == SYNCHRONIZE_CACHE) {
863 sectors = transport_get_sectors_10(cdb);
864 cmd->t_task_lba = transport_lba_32(cdb);
865 } else {
866 sectors = transport_get_sectors_16(cdb);
867 cmd->t_task_lba = transport_lba_64(cdb);
868 }
869 if (ops->execute_sync_cache) {
870 cmd->execute_cmd = ops->execute_sync_cache;
871 goto check_lba;
872 }
873 size = 0;
874 cmd->execute_cmd = sbc_emulate_noop;
875 break;
876 case UNMAP:
877 if (!ops->execute_unmap)
878 return TCM_UNSUPPORTED_SCSI_OPCODE;
879
880 size = get_unaligned_be16(&cdb[7]);
881 cmd->execute_cmd = ops->execute_unmap;
882 break;
883 case WRITE_SAME_16:
884 sectors = transport_get_sectors_16(cdb);
885 if (!sectors) {
886 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
887 return TCM_INVALID_CDB_FIELD;
888 }
889
890 size = sbc_get_size(cmd, 1);
891 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
892
893 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
894 if (ret)
895 return ret;
896 break;
897 case WRITE_SAME:
898 sectors = transport_get_sectors_10(cdb);
899 if (!sectors) {
900 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
901 return TCM_INVALID_CDB_FIELD;
902 }
903
904 size = sbc_get_size(cmd, 1);
905 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
906
907 /*
908 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
909 * of byte 1 bit 3 UNMAP instead of original reserved field
910 */
911 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
912 if (ret)
913 return ret;
914 break;
915 case VERIFY:
916 size = 0;
917 cmd->execute_cmd = sbc_emulate_noop;
918 break;
919 case REZERO_UNIT:
920 case SEEK_6:
921 case SEEK_10:
922 /*
923 * There are still clients out there which use these old SCSI-2
924 * commands. This mainly happens when running VMs with legacy
925 * guest systems, connected via SCSI command pass-through to
926 * iSCSI targets. Make them happy and return status GOOD.
927 */
928 size = 0;
929 cmd->execute_cmd = sbc_emulate_noop;
930 break;
931 default:
932 ret = spc_parse_cdb(cmd, &size);
933 if (ret)
934 return ret;
935 }
936
937 /* reject any command that we don't have a handler for */
938 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
939 return TCM_UNSUPPORTED_SCSI_OPCODE;
940
941 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
942 unsigned long long end_lba;
943
944 if (sectors > dev->dev_attrib.fabric_max_sectors) {
945 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
946 " big sectors %u exceeds fabric_max_sectors:"
947 " %u\n", cdb[0], sectors,
948 dev->dev_attrib.fabric_max_sectors);
949 return TCM_INVALID_CDB_FIELD;
950 }
951 if (sectors > dev->dev_attrib.hw_max_sectors) {
952 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
953 " big sectors %u exceeds backend hw_max_sectors:"
954 " %u\n", cdb[0], sectors,
955 dev->dev_attrib.hw_max_sectors);
956 return TCM_INVALID_CDB_FIELD;
957 }
958 check_lba:
959 end_lba = dev->transport->get_blocks(dev) + 1;
960 if (cmd->t_task_lba + sectors > end_lba) {
961 pr_err("cmd exceeds last lba %llu "
962 "(lba %llu, sectors %u)\n",
963 end_lba, cmd->t_task_lba, sectors);
964 return TCM_ADDRESS_OUT_OF_RANGE;
965 }
966
967 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
968 size = sbc_get_size(cmd, sectors);
969 }
970
971 return target_cmd_size_check(cmd, size);
972 }
973 EXPORT_SYMBOL(sbc_parse_cdb);
974
975 u32 sbc_get_device_type(struct se_device *dev)
976 {
977 return TYPE_DISK;
978 }
979 EXPORT_SYMBOL(sbc_get_device_type);
980
981 sense_reason_t
982 sbc_execute_unmap(struct se_cmd *cmd,
983 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
984 sector_t, sector_t),
985 void *priv)
986 {
987 struct se_device *dev = cmd->se_dev;
988 unsigned char *buf, *ptr = NULL;
989 sector_t lba;
990 int size;
991 u32 range;
992 sense_reason_t ret = 0;
993 int dl, bd_dl;
994
995 /* We never set ANC_SUP */
996 if (cmd->t_task_cdb[1])
997 return TCM_INVALID_CDB_FIELD;
998
999 if (cmd->data_length == 0) {
1000 target_complete_cmd(cmd, SAM_STAT_GOOD);
1001 return 0;
1002 }
1003
1004 if (cmd->data_length < 8) {
1005 pr_warn("UNMAP parameter list length %u too small\n",
1006 cmd->data_length);
1007 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1008 }
1009
1010 buf = transport_kmap_data_sg(cmd);
1011 if (!buf)
1012 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1013
1014 dl = get_unaligned_be16(&buf[0]);
1015 bd_dl = get_unaligned_be16(&buf[2]);
1016
1017 size = cmd->data_length - 8;
1018 if (bd_dl > size)
1019 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1020 cmd->data_length, bd_dl);
1021 else
1022 size = bd_dl;
1023
1024 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1025 ret = TCM_INVALID_PARAMETER_LIST;
1026 goto err;
1027 }
1028
1029 /* First UNMAP block descriptor starts at 8 byte offset */
1030 ptr = &buf[8];
1031 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1032 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1033
1034 while (size >= 16) {
1035 lba = get_unaligned_be64(&ptr[0]);
1036 range = get_unaligned_be32(&ptr[8]);
1037 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1038 (unsigned long long)lba, range);
1039
1040 if (range > dev->dev_attrib.max_unmap_lba_count) {
1041 ret = TCM_INVALID_PARAMETER_LIST;
1042 goto err;
1043 }
1044
1045 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1046 ret = TCM_ADDRESS_OUT_OF_RANGE;
1047 goto err;
1048 }
1049
1050 ret = do_unmap_fn(cmd, priv, lba, range);
1051 if (ret)
1052 goto err;
1053
1054 ptr += 16;
1055 size -= 16;
1056 }
1057
1058 err:
1059 transport_kunmap_data_sg(cmd);
1060 if (!ret)
1061 target_complete_cmd(cmd, GOOD);
1062 return ret;
1063 }
1064 EXPORT_SYMBOL(sbc_execute_unmap);
1065
1066 void
1067 sbc_dif_generate(struct se_cmd *cmd)
1068 {
1069 struct se_device *dev = cmd->se_dev;
1070 struct se_dif_v1_tuple *sdt;
1071 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1072 sector_t sector = cmd->t_task_lba;
1073 void *daddr, *paddr;
1074 int i, j, offset = 0;
1075
1076 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1077 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1078 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1079
1080 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1081
1082 if (offset >= psg->length) {
1083 kunmap_atomic(paddr);
1084 psg = sg_next(psg);
1085 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1086 offset = 0;
1087 }
1088
1089 sdt = paddr + offset;
1090 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1091 dev->dev_attrib.block_size));
1092 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
1093 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1094 sdt->app_tag = 0;
1095
1096 pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x"
1097 " app_tag: 0x%04x ref_tag: %u\n",
1098 (unsigned long long)sector, sdt->guard_tag,
1099 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1100
1101 sector++;
1102 offset += sizeof(struct se_dif_v1_tuple);
1103 }
1104
1105 kunmap_atomic(paddr);
1106 kunmap_atomic(daddr);
1107 }
1108 }
1109
1110 static sense_reason_t
1111 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
1112 const void *p, sector_t sector, unsigned int ei_lba)
1113 {
1114 int block_size = dev->dev_attrib.block_size;
1115 __be16 csum;
1116
1117 csum = cpu_to_be16(crc_t10dif(p, block_size));
1118
1119 if (sdt->guard_tag != csum) {
1120 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1121 " csum 0x%04x\n", (unsigned long long)sector,
1122 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1123 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1124 }
1125
1126 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
1127 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1128 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1129 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1130 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1131 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1132 }
1133
1134 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
1135 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1136 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1137 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1138 be32_to_cpu(sdt->ref_tag), ei_lba);
1139 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1140 }
1141
1142 return 0;
1143 }
1144
1145 static void
1146 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1147 struct scatterlist *sg, int sg_off)
1148 {
1149 struct se_device *dev = cmd->se_dev;
1150 struct scatterlist *psg;
1151 void *paddr, *addr;
1152 unsigned int i, len, left;
1153 unsigned int offset = sg_off;
1154
1155 left = sectors * dev->prot_length;
1156
1157 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1158 unsigned int psg_len, copied = 0;
1159
1160 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1161 psg_len = min(left, psg->length);
1162 while (psg_len) {
1163 len = min(psg_len, sg->length - offset);
1164 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1165
1166 if (read)
1167 memcpy(paddr + copied, addr, len);
1168 else
1169 memcpy(addr, paddr + copied, len);
1170
1171 left -= len;
1172 offset += len;
1173 copied += len;
1174 psg_len -= len;
1175
1176 if (offset >= sg->length) {
1177 sg = sg_next(sg);
1178 offset = 0;
1179 }
1180 kunmap_atomic(addr);
1181 }
1182 kunmap_atomic(paddr);
1183 }
1184 }
1185
1186 sense_reason_t
1187 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1188 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1189 {
1190 struct se_device *dev = cmd->se_dev;
1191 struct se_dif_v1_tuple *sdt;
1192 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1193 sector_t sector = start;
1194 void *daddr, *paddr;
1195 int i, j, offset = 0;
1196 sense_reason_t rc;
1197
1198 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1199 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1200 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1201
1202 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1203
1204 if (offset >= psg->length) {
1205 kunmap_atomic(paddr);
1206 psg = sg_next(psg);
1207 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1208 offset = 0;
1209 }
1210
1211 sdt = paddr + offset;
1212
1213 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1214 " app_tag: 0x%04x ref_tag: %u\n",
1215 (unsigned long long)sector, sdt->guard_tag,
1216 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1217
1218 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1219 ei_lba);
1220 if (rc) {
1221 kunmap_atomic(paddr);
1222 kunmap_atomic(daddr);
1223 cmd->bad_sector = sector;
1224 return rc;
1225 }
1226
1227 sector++;
1228 ei_lba++;
1229 offset += sizeof(struct se_dif_v1_tuple);
1230 }
1231
1232 kunmap_atomic(paddr);
1233 kunmap_atomic(daddr);
1234 }
1235 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1236
1237 return 0;
1238 }
1239 EXPORT_SYMBOL(sbc_dif_verify_write);
1240
1241 static sense_reason_t
1242 __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1243 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1244 {
1245 struct se_device *dev = cmd->se_dev;
1246 struct se_dif_v1_tuple *sdt;
1247 struct scatterlist *dsg, *psg = sg;
1248 sector_t sector = start;
1249 void *daddr, *paddr;
1250 int i, j, offset = sg_off;
1251 sense_reason_t rc;
1252
1253 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1254 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1255 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
1256
1257 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1258
1259 if (offset >= psg->length) {
1260 kunmap_atomic(paddr);
1261 psg = sg_next(psg);
1262 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1263 offset = 0;
1264 }
1265
1266 sdt = paddr + offset;
1267
1268 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1269 " app_tag: 0x%04x ref_tag: %u\n",
1270 (unsigned long long)sector, sdt->guard_tag,
1271 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1272
1273 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1274 sector++;
1275 offset += sizeof(struct se_dif_v1_tuple);
1276 continue;
1277 }
1278
1279 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1280 ei_lba);
1281 if (rc) {
1282 kunmap_atomic(paddr);
1283 kunmap_atomic(daddr);
1284 cmd->bad_sector = sector;
1285 return rc;
1286 }
1287
1288 sector++;
1289 ei_lba++;
1290 offset += sizeof(struct se_dif_v1_tuple);
1291 }
1292
1293 kunmap_atomic(paddr);
1294 kunmap_atomic(daddr);
1295 }
1296
1297 return 0;
1298 }
1299
1300 sense_reason_t
1301 sbc_dif_read_strip(struct se_cmd *cmd)
1302 {
1303 struct se_device *dev = cmd->se_dev;
1304 u32 sectors = cmd->prot_length / dev->prot_length;
1305
1306 return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1307 cmd->t_prot_sg, 0);
1308 }
1309
1310 sense_reason_t
1311 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1312 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1313 {
1314 sense_reason_t rc;
1315
1316 rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1317 if (rc)
1318 return rc;
1319
1320 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1321 return 0;
1322 }
1323 EXPORT_SYMBOL(sbc_dif_verify_read);
Linux kernel - Deliverables
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