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Linux 3.18.86
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blob2cd7e239fbafeeb581b0d5b935f0aa5ec9dd8c47
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_with_length(cmd, GOOD, 8);
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_with_length(cmd, GOOD, 32);
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 struct se_device *dev = cmd->se_dev;
255 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
256 unsigned int sectors = sbc_get_write_same_sectors(cmd);
257
258 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
259 pr_err("WRITE_SAME PBDATA and LBDATA"
260 " bits not supported for Block Discard"
261 " Emulation\n");
262 return TCM_UNSUPPORTED_SCSI_OPCODE;
263 }
264 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
265 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
266 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
267 return TCM_INVALID_CDB_FIELD;
268 }
269 /*
270 * Sanity check for LBA wrap and request past end of device.
271 */
272 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
273 ((cmd->t_task_lba + sectors) > end_lba)) {
274 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
275 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
276 return TCM_ADDRESS_OUT_OF_RANGE;
277 }
278
279 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
280 if (flags[0] & 0x10) {
281 pr_warn("WRITE SAME with ANCHOR not supported\n");
282 return TCM_INVALID_CDB_FIELD;
283 }
284 /*
285 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
286 * translated into block discard requests within backend code.
287 */
288 if (flags[0] & 0x08) {
289 if (!ops->execute_write_same_unmap)
290 return TCM_UNSUPPORTED_SCSI_OPCODE;
291
292 cmd->execute_cmd = ops->execute_write_same_unmap;
293 return 0;
294 }
295 if (!ops->execute_write_same)
296 return TCM_UNSUPPORTED_SCSI_OPCODE;
297
298 cmd->execute_cmd = ops->execute_write_same;
299 return 0;
300 }
301
302 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success,
303 int *post_ret)
304 {
305 unsigned char *buf, *addr;
306 struct scatterlist *sg;
307 unsigned int offset;
308 sense_reason_t ret = TCM_NO_SENSE;
309 int i, count;
310 /*
311 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
312 *
313 * 1) read the specified logical block(s);
314 * 2) transfer logical blocks from the data-out buffer;
315 * 3) XOR the logical blocks transferred from the data-out buffer with
316 * the logical blocks read, storing the resulting XOR data in a buffer;
317 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
318 * blocks transferred from the data-out buffer; and
319 * 5) transfer the resulting XOR data to the data-in buffer.
320 */
321 buf = kmalloc(cmd->data_length, GFP_KERNEL);
322 if (!buf) {
323 pr_err("Unable to allocate xor_callback buf\n");
324 return TCM_OUT_OF_RESOURCES;
325 }
326 /*
327 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
328 * into the locally allocated *buf
329 */
330 sg_copy_to_buffer(cmd->t_data_sg,
331 cmd->t_data_nents,
332 buf,
333 cmd->data_length);
334
335 /*
336 * Now perform the XOR against the BIDI read memory located at
337 * cmd->t_mem_bidi_list
338 */
339
340 offset = 0;
341 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
342 addr = kmap_atomic(sg_page(sg));
343 if (!addr) {
344 ret = TCM_OUT_OF_RESOURCES;
345 goto out;
346 }
347
348 for (i = 0; i < sg->length; i++)
349 *(addr + sg->offset + i) ^= *(buf + offset + i);
350
351 offset += sg->length;
352 kunmap_atomic(addr);
353 }
354
355 out:
356 kfree(buf);
357 return ret;
358 }
359
360 static sense_reason_t
361 sbc_execute_rw(struct se_cmd *cmd)
362 {
363 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
364 cmd->data_direction);
365 }
366
367 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success,
368 int *post_ret)
369 {
370 struct se_device *dev = cmd->se_dev;
371
372 /*
373 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
374 * within target_complete_ok_work() if the command was successfully
375 * sent to the backend driver.
376 */
377 spin_lock_irq(&cmd->t_state_lock);
378 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) {
379 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
380 *post_ret = 1;
381 }
382 spin_unlock_irq(&cmd->t_state_lock);
383
384 /*
385 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
386 * before the original READ I/O submission.
387 */
388 up(&dev->caw_sem);
389
390 return TCM_NO_SENSE;
391 }
392
393 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
394 int *post_ret)
395 {
396 struct se_device *dev = cmd->se_dev;
397 struct scatterlist *write_sg = NULL, *sg;
398 unsigned char *buf = NULL, *addr;
399 struct sg_mapping_iter m;
400 unsigned int offset = 0, len;
401 unsigned int nlbas = cmd->t_task_nolb;
402 unsigned int block_size = dev->dev_attrib.block_size;
403 unsigned int compare_len = (nlbas * block_size);
404 sense_reason_t ret = TCM_NO_SENSE;
405 int rc, i;
406
407 /*
408 * Handle early failure in transport_generic_request_failure(),
409 * which will not have taken ->caw_sem yet..
410 */
411 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
412 return TCM_NO_SENSE;
413 /*
414 * Handle special case for zero-length COMPARE_AND_WRITE
415 */
416 if (!cmd->data_length)
417 goto out;
418 /*
419 * Immediately exit + release dev->caw_sem if command has already
420 * been failed with a non-zero SCSI status.
421 */
422 if (cmd->scsi_status) {
423 pr_err("compare_and_write_callback: non zero scsi_status:"
424 " 0x%02x\n", cmd->scsi_status);
425 goto out;
426 }
427
428 buf = kzalloc(cmd->data_length, GFP_KERNEL);
429 if (!buf) {
430 pr_err("Unable to allocate compare_and_write buf\n");
431 ret = TCM_OUT_OF_RESOURCES;
432 goto out;
433 }
434
435 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
436 GFP_KERNEL);
437 if (!write_sg) {
438 pr_err("Unable to allocate compare_and_write sg\n");
439 ret = TCM_OUT_OF_RESOURCES;
440 goto out;
441 }
442 sg_init_table(write_sg, cmd->t_data_nents);
443 /*
444 * Setup verify and write data payloads from total NumberLBAs.
445 */
446 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
447 cmd->data_length);
448 if (!rc) {
449 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
450 ret = TCM_OUT_OF_RESOURCES;
451 goto out;
452 }
453 /*
454 * Compare against SCSI READ payload against verify payload
455 */
456 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
457 addr = (unsigned char *)kmap_atomic(sg_page(sg));
458 if (!addr) {
459 ret = TCM_OUT_OF_RESOURCES;
460 goto out;
461 }
462
463 len = min(sg->length, compare_len);
464
465 if (memcmp(addr, buf + offset, len)) {
466 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
467 addr, buf + offset);
468 kunmap_atomic(addr);
469 goto miscompare;
470 }
471 kunmap_atomic(addr);
472
473 offset += len;
474 compare_len -= len;
475 if (!compare_len)
476 break;
477 }
478
479 i = 0;
480 len = cmd->t_task_nolb * block_size;
481 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
482 /*
483 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
484 */
485 while (len) {
486 sg_miter_next(&m);
487
488 if (block_size < PAGE_SIZE) {
489 sg_set_page(&write_sg[i], m.page, block_size,
490 m.piter.sg->offset + block_size);
491 } else {
492 sg_miter_next(&m);
493 sg_set_page(&write_sg[i], m.page, block_size,
494 m.piter.sg->offset);
495 }
496 len -= block_size;
497 i++;
498 }
499 sg_miter_stop(&m);
500 /*
501 * Save the original SGL + nents values before updating to new
502 * assignments, to be released in transport_free_pages() ->
503 * transport_reset_sgl_orig()
504 */
505 cmd->t_data_sg_orig = cmd->t_data_sg;
506 cmd->t_data_sg = write_sg;
507 cmd->t_data_nents_orig = cmd->t_data_nents;
508 cmd->t_data_nents = 1;
509
510 cmd->sam_task_attr = MSG_HEAD_TAG;
511 cmd->transport_complete_callback = compare_and_write_post;
512 /*
513 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
514 * for submitting the adjusted SGL to write instance user-data.
515 */
516 cmd->execute_cmd = sbc_execute_rw;
517
518 spin_lock_irq(&cmd->t_state_lock);
519 cmd->t_state = TRANSPORT_PROCESSING;
520 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
521 spin_unlock_irq(&cmd->t_state_lock);
522
523 __target_execute_cmd(cmd);
524
525 kfree(buf);
526 return ret;
527
528 miscompare:
529 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
530 dev->transport->name);
531 ret = TCM_MISCOMPARE_VERIFY;
532 out:
533 /*
534 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
535 * sbc_compare_and_write() before the original READ I/O submission.
536 */
537 up(&dev->caw_sem);
538 kfree(write_sg);
539 kfree(buf);
540 return ret;
541 }
542
543 static sense_reason_t
544 sbc_compare_and_write(struct se_cmd *cmd)
545 {
546 struct se_device *dev = cmd->se_dev;
547 sense_reason_t ret;
548 int rc;
549 /*
550 * Submit the READ first for COMPARE_AND_WRITE to perform the
551 * comparision using SGLs at cmd->t_bidi_data_sg..
552 */
553 rc = down_interruptible(&dev->caw_sem);
554 if ((rc != 0) || signal_pending(current)) {
555 cmd->transport_complete_callback = NULL;
556 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
557 }
558 /*
559 * Reset cmd->data_length to individual block_size in order to not
560 * confuse backend drivers that depend on this value matching the
561 * size of the I/O being submitted.
562 */
563 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
564
565 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
566 DMA_FROM_DEVICE);
567 if (ret) {
568 cmd->transport_complete_callback = NULL;
569 up(&dev->caw_sem);
570 return ret;
571 }
572 /*
573 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
574 * upon MISCOMPARE, or in compare_and_write_done() upon completion
575 * of WRITE instance user-data.
576 */
577 return TCM_NO_SENSE;
578 }
579
580 static int
581 sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
582 bool is_write, struct se_cmd *cmd)
583 {
584 if (is_write) {
585 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS :
586 TARGET_PROT_DOUT_INSERT;
587 switch (protect) {
588 case 0x0:
589 case 0x3:
590 cmd->prot_checks = 0;
591 break;
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 0x4:
603 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
604 break;
605 default:
606 pr_err("Unsupported protect field %d\n", protect);
607 return -EINVAL;
608 }
609 } else {
610 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS :
611 TARGET_PROT_DIN_STRIP;
612 switch (protect) {
613 case 0x0:
614 case 0x1:
615 case 0x5:
616 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
617 if (prot_type == TARGET_DIF_TYPE1_PROT)
618 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
619 break;
620 case 0x2:
621 if (prot_type == TARGET_DIF_TYPE1_PROT)
622 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
623 break;
624 case 0x3:
625 cmd->prot_checks = 0;
626 break;
627 case 0x4:
628 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
629 break;
630 default:
631 pr_err("Unsupported protect field %d\n", protect);
632 return -EINVAL;
633 }
634 }
635
636 return 0;
637 }
638
639 static bool
640 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
641 u32 sectors, bool is_write)
642 {
643 u8 protect = cdb[1] >> 5;
644
645 if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto)
646 return true;
647
648 switch (dev->dev_attrib.pi_prot_type) {
649 case TARGET_DIF_TYPE3_PROT:
650 cmd->reftag_seed = 0xffffffff;
651 break;
652 case TARGET_DIF_TYPE2_PROT:
653 if (protect)
654 return false;
655
656 cmd->reftag_seed = cmd->t_task_lba;
657 break;
658 case TARGET_DIF_TYPE1_PROT:
659 cmd->reftag_seed = cmd->t_task_lba;
660 break;
661 case TARGET_DIF_TYPE0_PROT:
662 default:
663 return true;
664 }
665
666 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
667 is_write, cmd))
668 return false;
669
670 cmd->prot_type = dev->dev_attrib.pi_prot_type;
671 cmd->prot_length = dev->prot_length * sectors;
672
673 /**
674 * In case protection information exists over the wire
675 * we modify command data length to describe pure data.
676 * The actual transfer length is data length + protection
677 * length
678 **/
679 if (protect)
680 cmd->data_length = sectors * dev->dev_attrib.block_size;
681
682 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
683 "prot_op=%d prot_checks=%d\n",
684 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
685 cmd->prot_op, cmd->prot_checks);
686
687 return true;
688 }
689
690 sense_reason_t
691 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
692 {
693 struct se_device *dev = cmd->se_dev;
694 unsigned char *cdb = cmd->t_task_cdb;
695 unsigned int size;
696 u32 sectors = 0;
697 sense_reason_t ret;
698
699 switch (cdb[0]) {
700 case READ_6:
701 sectors = transport_get_sectors_6(cdb);
702 cmd->t_task_lba = transport_lba_21(cdb);
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 READ_10:
708 sectors = transport_get_sectors_10(cdb);
709 cmd->t_task_lba = transport_lba_32(cdb);
710
711 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
712 return TCM_UNSUPPORTED_SCSI_OPCODE;
713
714 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
715 cmd->execute_rw = ops->execute_rw;
716 cmd->execute_cmd = sbc_execute_rw;
717 break;
718 case READ_12:
719 sectors = transport_get_sectors_12(cdb);
720 cmd->t_task_lba = transport_lba_32(cdb);
721
722 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
723 return TCM_UNSUPPORTED_SCSI_OPCODE;
724
725 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
726 cmd->execute_rw = ops->execute_rw;
727 cmd->execute_cmd = sbc_execute_rw;
728 break;
729 case READ_16:
730 sectors = transport_get_sectors_16(cdb);
731 cmd->t_task_lba = transport_lba_64(cdb);
732
733 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
734 return TCM_UNSUPPORTED_SCSI_OPCODE;
735
736 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
737 cmd->execute_rw = ops->execute_rw;
738 cmd->execute_cmd = sbc_execute_rw;
739 break;
740 case WRITE_6:
741 sectors = transport_get_sectors_6(cdb);
742 cmd->t_task_lba = transport_lba_21(cdb);
743 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
744 cmd->execute_rw = ops->execute_rw;
745 cmd->execute_cmd = sbc_execute_rw;
746 break;
747 case WRITE_10:
748 case WRITE_VERIFY:
749 sectors = transport_get_sectors_10(cdb);
750 cmd->t_task_lba = transport_lba_32(cdb);
751
752 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
753 return TCM_UNSUPPORTED_SCSI_OPCODE;
754
755 if (cdb[1] & 0x8)
756 cmd->se_cmd_flags |= SCF_FUA;
757 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
758 cmd->execute_rw = ops->execute_rw;
759 cmd->execute_cmd = sbc_execute_rw;
760 break;
761 case WRITE_12:
762 sectors = transport_get_sectors_12(cdb);
763 cmd->t_task_lba = transport_lba_32(cdb);
764
765 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
766 return TCM_UNSUPPORTED_SCSI_OPCODE;
767
768 if (cdb[1] & 0x8)
769 cmd->se_cmd_flags |= SCF_FUA;
770 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
771 cmd->execute_rw = ops->execute_rw;
772 cmd->execute_cmd = sbc_execute_rw;
773 break;
774 case WRITE_16:
775 sectors = transport_get_sectors_16(cdb);
776 cmd->t_task_lba = transport_lba_64(cdb);
777
778 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
779 return TCM_UNSUPPORTED_SCSI_OPCODE;
780
781 if (cdb[1] & 0x8)
782 cmd->se_cmd_flags |= SCF_FUA;
783 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
784 cmd->execute_rw = ops->execute_rw;
785 cmd->execute_cmd = sbc_execute_rw;
786 break;
787 case XDWRITEREAD_10:
788 if (cmd->data_direction != DMA_TO_DEVICE ||
789 !(cmd->se_cmd_flags & SCF_BIDI))
790 return TCM_INVALID_CDB_FIELD;
791 sectors = transport_get_sectors_10(cdb);
792
793 cmd->t_task_lba = transport_lba_32(cdb);
794 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
795
796 /*
797 * Setup BIDI XOR callback to be run after I/O completion.
798 */
799 cmd->execute_rw = ops->execute_rw;
800 cmd->execute_cmd = sbc_execute_rw;
801 cmd->transport_complete_callback = &xdreadwrite_callback;
802 if (cdb[1] & 0x8)
803 cmd->se_cmd_flags |= SCF_FUA;
804 break;
805 case VARIABLE_LENGTH_CMD:
806 {
807 u16 service_action = get_unaligned_be16(&cdb[8]);
808 switch (service_action) {
809 case XDWRITEREAD_32:
810 sectors = transport_get_sectors_32(cdb);
811
812 /*
813 * Use WRITE_32 and READ_32 opcodes for the emulated
814 * XDWRITE_READ_32 logic.
815 */
816 cmd->t_task_lba = transport_lba_64_ext(cdb);
817 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
818
819 /*
820 * Setup BIDI XOR callback to be run during after I/O
821 * completion.
822 */
823 cmd->execute_rw = ops->execute_rw;
824 cmd->execute_cmd = sbc_execute_rw;
825 cmd->transport_complete_callback = &xdreadwrite_callback;
826 if (cdb[1] & 0x8)
827 cmd->se_cmd_flags |= SCF_FUA;
828 break;
829 case WRITE_SAME_32:
830 sectors = transport_get_sectors_32(cdb);
831 if (!sectors) {
832 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
833 " supported\n");
834 return TCM_INVALID_CDB_FIELD;
835 }
836
837 size = sbc_get_size(cmd, 1);
838 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
839
840 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
841 if (ret)
842 return ret;
843 break;
844 default:
845 pr_err("VARIABLE_LENGTH_CMD service action"
846 " 0x%04x not supported\n", service_action);
847 return TCM_UNSUPPORTED_SCSI_OPCODE;
848 }
849 break;
850 }
851 case COMPARE_AND_WRITE:
852 sectors = cdb[13];
853 /*
854 * Currently enforce COMPARE_AND_WRITE for a single sector
855 */
856 if (sectors > 1) {
857 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
858 " than 1\n", sectors);
859 return TCM_INVALID_CDB_FIELD;
860 }
861 /*
862 * Double size because we have two buffers, note that
863 * zero is not an error..
864 */
865 size = 2 * sbc_get_size(cmd, sectors);
866 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
867 cmd->t_task_nolb = sectors;
868 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
869 cmd->execute_rw = ops->execute_rw;
870 cmd->execute_cmd = sbc_compare_and_write;
871 cmd->transport_complete_callback = compare_and_write_callback;
872 break;
873 case READ_CAPACITY:
874 size = READ_CAP_LEN;
875 cmd->execute_cmd = sbc_emulate_readcapacity;
876 break;
877 case SERVICE_ACTION_IN:
878 switch (cmd->t_task_cdb[1] & 0x1f) {
879 case SAI_READ_CAPACITY_16:
880 cmd->execute_cmd = sbc_emulate_readcapacity_16;
881 break;
882 case SAI_REPORT_REFERRALS:
883 cmd->execute_cmd = target_emulate_report_referrals;
884 break;
885 default:
886 pr_err("Unsupported SA: 0x%02x\n",
887 cmd->t_task_cdb[1] & 0x1f);
888 return TCM_INVALID_CDB_FIELD;
889 }
890 size = (cdb[10] << 24) | (cdb[11] << 16) |
891 (cdb[12] << 8) | cdb[13];
892 break;
893 case SYNCHRONIZE_CACHE:
894 case SYNCHRONIZE_CACHE_16:
895 if (cdb[0] == SYNCHRONIZE_CACHE) {
896 sectors = transport_get_sectors_10(cdb);
897 cmd->t_task_lba = transport_lba_32(cdb);
898 } else {
899 sectors = transport_get_sectors_16(cdb);
900 cmd->t_task_lba = transport_lba_64(cdb);
901 }
902 if (ops->execute_sync_cache) {
903 cmd->execute_cmd = ops->execute_sync_cache;
904 goto check_lba;
905 }
906 size = 0;
907 cmd->execute_cmd = sbc_emulate_noop;
908 break;
909 case UNMAP:
910 if (!ops->execute_unmap)
911 return TCM_UNSUPPORTED_SCSI_OPCODE;
912
913 size = get_unaligned_be16(&cdb[7]);
914 cmd->execute_cmd = ops->execute_unmap;
915 break;
916 case WRITE_SAME_16:
917 sectors = transport_get_sectors_16(cdb);
918 if (!sectors) {
919 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
920 return TCM_INVALID_CDB_FIELD;
921 }
922
923 size = sbc_get_size(cmd, 1);
924 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
925
926 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
927 if (ret)
928 return ret;
929 break;
930 case WRITE_SAME:
931 sectors = transport_get_sectors_10(cdb);
932 if (!sectors) {
933 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
934 return TCM_INVALID_CDB_FIELD;
935 }
936
937 size = sbc_get_size(cmd, 1);
938 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
939
940 /*
941 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
942 * of byte 1 bit 3 UNMAP instead of original reserved field
943 */
944 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
945 if (ret)
946 return ret;
947 break;
948 case VERIFY:
949 case VERIFY_16:
950 size = 0;
951 if (cdb[0] == VERIFY) {
952 sectors = transport_get_sectors_10(cdb);
953 cmd->t_task_lba = transport_lba_32(cdb);
954 } else {
955 sectors = transport_get_sectors_16(cdb);
956 cmd->t_task_lba = transport_lba_64(cdb);
957 }
958 cmd->execute_cmd = sbc_emulate_noop;
959 goto check_lba;
960 case REZERO_UNIT:
961 case SEEK_6:
962 case SEEK_10:
963 /*
964 * There are still clients out there which use these old SCSI-2
965 * commands. This mainly happens when running VMs with legacy
966 * guest systems, connected via SCSI command pass-through to
967 * iSCSI targets. Make them happy and return status GOOD.
968 */
969 size = 0;
970 cmd->execute_cmd = sbc_emulate_noop;
971 break;
972 default:
973 ret = spc_parse_cdb(cmd, &size);
974 if (ret)
975 return ret;
976 }
977
978 /* reject any command that we don't have a handler for */
979 if (!cmd->execute_cmd)
980 return TCM_UNSUPPORTED_SCSI_OPCODE;
981
982 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
983 unsigned long long end_lba;
984 check_lba:
985 end_lba = dev->transport->get_blocks(dev) + 1;
986 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
987 ((cmd->t_task_lba + sectors) > end_lba)) {
988 pr_err("cmd exceeds last lba %llu "
989 "(lba %llu, sectors %u)\n",
990 end_lba, cmd->t_task_lba, sectors);
991 return TCM_ADDRESS_OUT_OF_RANGE;
992 }
993
994 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
995 size = sbc_get_size(cmd, sectors);
996 }
997
998 return target_cmd_size_check(cmd, size);
999 }
1000 EXPORT_SYMBOL(sbc_parse_cdb);
1001
1002 u32 sbc_get_device_type(struct se_device *dev)
1003 {
1004 return TYPE_DISK;
1005 }
1006 EXPORT_SYMBOL(sbc_get_device_type);
1007
1008 sense_reason_t
1009 sbc_execute_unmap(struct se_cmd *cmd,
1010 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
1011 sector_t, sector_t),
1012 void *priv)
1013 {
1014 struct se_device *dev = cmd->se_dev;
1015 unsigned char *buf, *ptr = NULL;
1016 sector_t lba;
1017 int size;
1018 u32 range;
1019 sense_reason_t ret = 0;
1020 int dl, bd_dl;
1021
1022 /* We never set ANC_SUP */
1023 if (cmd->t_task_cdb[1])
1024 return TCM_INVALID_CDB_FIELD;
1025
1026 if (cmd->data_length == 0) {
1027 target_complete_cmd(cmd, SAM_STAT_GOOD);
1028 return 0;
1029 }
1030
1031 if (cmd->data_length < 8) {
1032 pr_warn("UNMAP parameter list length %u too small\n",
1033 cmd->data_length);
1034 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1035 }
1036
1037 buf = transport_kmap_data_sg(cmd);
1038 if (!buf)
1039 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1040
1041 dl = get_unaligned_be16(&buf[0]);
1042 bd_dl = get_unaligned_be16(&buf[2]);
1043
1044 size = cmd->data_length - 8;
1045 if (bd_dl > size)
1046 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1047 cmd->data_length, bd_dl);
1048 else
1049 size = bd_dl;
1050
1051 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1052 ret = TCM_INVALID_PARAMETER_LIST;
1053 goto err;
1054 }
1055
1056 /* First UNMAP block descriptor starts at 8 byte offset */
1057 ptr = &buf[8];
1058 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1059 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1060
1061 while (size >= 16) {
1062 lba = get_unaligned_be64(&ptr[0]);
1063 range = get_unaligned_be32(&ptr[8]);
1064 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1065 (unsigned long long)lba, range);
1066
1067 if (range > dev->dev_attrib.max_unmap_lba_count) {
1068 ret = TCM_INVALID_PARAMETER_LIST;
1069 goto err;
1070 }
1071
1072 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1073 ret = TCM_ADDRESS_OUT_OF_RANGE;
1074 goto err;
1075 }
1076
1077 ret = do_unmap_fn(cmd, priv, lba, range);
1078 if (ret)
1079 goto err;
1080
1081 ptr += 16;
1082 size -= 16;
1083 }
1084
1085 err:
1086 transport_kunmap_data_sg(cmd);
1087 if (!ret)
1088 target_complete_cmd(cmd, GOOD);
1089 return ret;
1090 }
1091 EXPORT_SYMBOL(sbc_execute_unmap);
1092
1093 void
1094 sbc_dif_generate(struct se_cmd *cmd)
1095 {
1096 struct se_device *dev = cmd->se_dev;
1097 struct se_dif_v1_tuple *sdt;
1098 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1099 sector_t sector = cmd->t_task_lba;
1100 void *daddr, *paddr;
1101 int i, j, offset = 0;
1102
1103 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1104 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1105 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1106
1107 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1108
1109 if (offset >= psg->length) {
1110 kunmap_atomic(paddr);
1111 psg = sg_next(psg);
1112 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1113 offset = 0;
1114 }
1115
1116 sdt = paddr + offset;
1117 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1118 dev->dev_attrib.block_size));
1119 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
1120 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1121 sdt->app_tag = 0;
1122
1123 pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x"
1124 " app_tag: 0x%04x ref_tag: %u\n",
1125 (unsigned long long)sector, sdt->guard_tag,
1126 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1127
1128 sector++;
1129 offset += sizeof(struct se_dif_v1_tuple);
1130 }
1131
1132 kunmap_atomic(paddr);
1133 kunmap_atomic(daddr);
1134 }
1135 }
1136
1137 static sense_reason_t
1138 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
1139 const void *p, sector_t sector, unsigned int ei_lba)
1140 {
1141 int block_size = dev->dev_attrib.block_size;
1142 __be16 csum;
1143
1144 csum = cpu_to_be16(crc_t10dif(p, block_size));
1145
1146 if (sdt->guard_tag != csum) {
1147 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1148 " csum 0x%04x\n", (unsigned long long)sector,
1149 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1150 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1151 }
1152
1153 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
1154 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1155 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1156 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1157 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1158 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1159 }
1160
1161 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
1162 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1163 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1164 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1165 be32_to_cpu(sdt->ref_tag), ei_lba);
1166 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1167 }
1168
1169 return 0;
1170 }
1171
1172 static void
1173 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1174 struct scatterlist *sg, int sg_off)
1175 {
1176 struct se_device *dev = cmd->se_dev;
1177 struct scatterlist *psg;
1178 void *paddr, *addr;
1179 unsigned int i, len, left;
1180 unsigned int offset = sg_off;
1181
1182 left = sectors * dev->prot_length;
1183
1184 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1185 unsigned int psg_len, copied = 0;
1186
1187 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1188 psg_len = min(left, psg->length);
1189 while (psg_len) {
1190 len = min(psg_len, sg->length - offset);
1191 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1192
1193 if (read)
1194 memcpy(paddr + copied, addr, len);
1195 else
1196 memcpy(addr, paddr + copied, len);
1197
1198 left -= len;
1199 offset += len;
1200 copied += len;
1201 psg_len -= len;
1202
1203 if (offset >= sg->length) {
1204 sg = sg_next(sg);
1205 offset = 0;
1206 }
1207 kunmap_atomic(addr);
1208 }
1209 kunmap_atomic(paddr);
1210 }
1211 }
1212
1213 sense_reason_t
1214 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1215 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1216 {
1217 struct se_device *dev = cmd->se_dev;
1218 struct se_dif_v1_tuple *sdt;
1219 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1220 sector_t sector = start;
1221 void *daddr, *paddr;
1222 int i, j, offset = 0;
1223 sense_reason_t rc;
1224
1225 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1226 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1227 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1228
1229 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1230
1231 if (offset >= psg->length) {
1232 kunmap_atomic(paddr);
1233 psg = sg_next(psg);
1234 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1235 offset = 0;
1236 }
1237
1238 sdt = paddr + offset;
1239
1240 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1241 " app_tag: 0x%04x ref_tag: %u\n",
1242 (unsigned long long)sector, sdt->guard_tag,
1243 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1244
1245 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1246 ei_lba);
1247 if (rc) {
1248 kunmap_atomic(paddr);
1249 kunmap_atomic(daddr);
1250 cmd->bad_sector = sector;
1251 return rc;
1252 }
1253
1254 sector++;
1255 ei_lba++;
1256 offset += sizeof(struct se_dif_v1_tuple);
1257 }
1258
1259 kunmap_atomic(paddr);
1260 kunmap_atomic(daddr);
1261 }
1262 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1263
1264 return 0;
1265 }
1266 EXPORT_SYMBOL(sbc_dif_verify_write);
1267
1268 static sense_reason_t
1269 __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1270 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1271 {
1272 struct se_device *dev = cmd->se_dev;
1273 struct se_dif_v1_tuple *sdt;
1274 struct scatterlist *dsg, *psg = sg;
1275 sector_t sector = start;
1276 void *daddr, *paddr;
1277 int i, j, offset = sg_off;
1278 sense_reason_t rc;
1279
1280 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1281 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1282 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
1283
1284 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1285
1286 if (offset >= psg->length) {
1287 kunmap_atomic(paddr);
1288 psg = sg_next(psg);
1289 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1290 offset = 0;
1291 }
1292
1293 sdt = paddr + offset;
1294
1295 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1296 " app_tag: 0x%04x ref_tag: %u\n",
1297 (unsigned long long)sector, sdt->guard_tag,
1298 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1299
1300 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1301 sector++;
1302 offset += sizeof(struct se_dif_v1_tuple);
1303 continue;
1304 }
1305
1306 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1307 ei_lba);
1308 if (rc) {
1309 kunmap_atomic(paddr);
1310 kunmap_atomic(daddr);
1311 cmd->bad_sector = sector;
1312 return rc;
1313 }
1314
1315 sector++;
1316 ei_lba++;
1317 offset += sizeof(struct se_dif_v1_tuple);
1318 }
1319
1320 kunmap_atomic(paddr);
1321 kunmap_atomic(daddr);
1322 }
1323
1324 return 0;
1325 }
1326
1327 sense_reason_t
1328 sbc_dif_read_strip(struct se_cmd *cmd)
1329 {
1330 struct se_device *dev = cmd->se_dev;
1331 u32 sectors = cmd->prot_length / dev->prot_length;
1332
1333 return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1334 cmd->t_prot_sg, 0);
1335 }
1336
1337 sense_reason_t
1338 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1339 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1340 {
1341 sense_reason_t rc;
1342
1343 rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1344 if (rc)
1345 return rc;
1346
1347 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1348 return 0;
1349 }
1350 EXPORT_SYMBOL(sbc_dif_verify_read);
Linux with added FPC-III support