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Restartable sequences: self-tests
[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_proto.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_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool);
41 static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd);
42
43 static sense_reason_t
44 sbc_emulate_readcapacity(struct se_cmd *cmd)
45 {
46 struct se_device *dev = cmd->se_dev;
47 unsigned char *cdb = cmd->t_task_cdb;
48 unsigned long long blocks_long = dev->transport->get_blocks(dev);
49 unsigned char *rbuf;
50 unsigned char buf[8];
51 u32 blocks;
52
53 /*
54 * SBC-2 says:
55 * If the PMI bit is set to zero and the LOGICAL BLOCK
56 * ADDRESS field is not set to zero, the device server shall
57 * terminate the command with CHECK CONDITION status with
58 * the sense key set to ILLEGAL REQUEST and the additional
59 * sense code set to INVALID FIELD IN CDB.
60 *
61 * In SBC-3, these fields are obsolete, but some SCSI
62 * compliance tests actually check this, so we might as well
63 * follow SBC-2.
64 */
65 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
66 return TCM_INVALID_CDB_FIELD;
67
68 if (blocks_long >= 0x00000000ffffffff)
69 blocks = 0xffffffff;
70 else
71 blocks = (u32)blocks_long;
72
73 buf[0] = (blocks >> 24) & 0xff;
74 buf[1] = (blocks >> 16) & 0xff;
75 buf[2] = (blocks >> 8) & 0xff;
76 buf[3] = blocks & 0xff;
77 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
78 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
79 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
80 buf[7] = dev->dev_attrib.block_size & 0xff;
81
82 rbuf = transport_kmap_data_sg(cmd);
83 if (rbuf) {
84 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
85 transport_kunmap_data_sg(cmd);
86 }
87
88 target_complete_cmd_with_length(cmd, GOOD, 8);
89 return 0;
90 }
91
92 static sense_reason_t
93 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
94 {
95 struct se_device *dev = cmd->se_dev;
96 struct se_session *sess = cmd->se_sess;
97 int pi_prot_type = dev->dev_attrib.pi_prot_type;
98
99 unsigned char *rbuf;
100 unsigned char buf[32];
101 unsigned long long blocks = dev->transport->get_blocks(dev);
102
103 memset(buf, 0, sizeof(buf));
104 buf[0] = (blocks >> 56) & 0xff;
105 buf[1] = (blocks >> 48) & 0xff;
106 buf[2] = (blocks >> 40) & 0xff;
107 buf[3] = (blocks >> 32) & 0xff;
108 buf[4] = (blocks >> 24) & 0xff;
109 buf[5] = (blocks >> 16) & 0xff;
110 buf[6] = (blocks >> 8) & 0xff;
111 buf[7] = blocks & 0xff;
112 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
113 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
114 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
115 buf[11] = dev->dev_attrib.block_size & 0xff;
116 /*
117 * Set P_TYPE and PROT_EN bits for DIF support
118 */
119 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
120 /*
121 * Only override a device's pi_prot_type if no T10-PI is
122 * available, and sess_prot_type has been explicitly enabled.
123 */
124 if (!pi_prot_type)
125 pi_prot_type = sess->sess_prot_type;
126
127 if (pi_prot_type)
128 buf[12] = (pi_prot_type - 1) << 1 | 0x1;
129 }
130
131 if (dev->transport->get_lbppbe)
132 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
133
134 if (dev->transport->get_alignment_offset_lbas) {
135 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
136 buf[14] = (lalba >> 8) & 0x3f;
137 buf[15] = lalba & 0xff;
138 }
139
140 /*
141 * Set Thin Provisioning Enable bit following sbc3r22 in section
142 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
143 */
144 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) {
145 buf[14] |= 0x80;
146
147 /*
148 * LBPRZ signifies that zeroes will be read back from an LBA after
149 * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2)
150 */
151 if (dev->dev_attrib.unmap_zeroes_data)
152 buf[14] |= 0x40;
153 }
154
155 rbuf = transport_kmap_data_sg(cmd);
156 if (rbuf) {
157 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
158 transport_kunmap_data_sg(cmd);
159 }
160
161 target_complete_cmd_with_length(cmd, GOOD, 32);
162 return 0;
163 }
164
165 static sense_reason_t
166 sbc_emulate_startstop(struct se_cmd *cmd)
167 {
168 unsigned char *cdb = cmd->t_task_cdb;
169
170 /*
171 * See sbc3r36 section 5.25
172 * Immediate bit should be set since there is nothing to complete
173 * POWER CONDITION MODIFIER 0h
174 */
175 if (!(cdb[1] & 1) || cdb[2] || cdb[3])
176 return TCM_INVALID_CDB_FIELD;
177
178 /*
179 * See sbc3r36 section 5.25
180 * POWER CONDITION 0h START_VALID - process START and LOEJ
181 */
182 if (cdb[4] >> 4 & 0xf)
183 return TCM_INVALID_CDB_FIELD;
184
185 /*
186 * See sbc3r36 section 5.25
187 * LOEJ 0h - nothing to load or unload
188 * START 1h - we are ready
189 */
190 if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4))
191 return TCM_INVALID_CDB_FIELD;
192
193 target_complete_cmd(cmd, SAM_STAT_GOOD);
194 return 0;
195 }
196
197 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
198 {
199 u32 num_blocks;
200
201 if (cmd->t_task_cdb[0] == WRITE_SAME)
202 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
203 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
204 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
205 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
206 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
207
208 /*
209 * Use the explicit range when non zero is supplied, otherwise calculate
210 * the remaining range based on ->get_blocks() - starting LBA.
211 */
212 if (num_blocks)
213 return num_blocks;
214
215 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
216 cmd->t_task_lba + 1;
217 }
218 EXPORT_SYMBOL(sbc_get_write_same_sectors);
219
220 static sense_reason_t
221 sbc_execute_write_same_unmap(struct se_cmd *cmd)
222 {
223 struct sbc_ops *ops = cmd->protocol_data;
224 sector_t nolb = sbc_get_write_same_sectors(cmd);
225 sense_reason_t ret;
226
227 if (nolb) {
228 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb);
229 if (ret)
230 return ret;
231 }
232
233 target_complete_cmd(cmd, GOOD);
234 return 0;
235 }
236
237 static sense_reason_t
238 sbc_emulate_noop(struct se_cmd *cmd)
239 {
240 target_complete_cmd(cmd, GOOD);
241 return 0;
242 }
243
244 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
245 {
246 return cmd->se_dev->dev_attrib.block_size * sectors;
247 }
248
249 static inline u32 transport_get_sectors_6(unsigned char *cdb)
250 {
251 /*
252 * Use 8-bit sector value. SBC-3 says:
253 *
254 * A TRANSFER LENGTH field set to zero specifies that 256
255 * logical blocks shall be written. Any other value
256 * specifies the number of logical blocks that shall be
257 * written.
258 */
259 return cdb[4] ? : 256;
260 }
261
262 static inline u32 transport_get_sectors_10(unsigned char *cdb)
263 {
264 return (u32)(cdb[7] << 8) + cdb[8];
265 }
266
267 static inline u32 transport_get_sectors_12(unsigned char *cdb)
268 {
269 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
270 }
271
272 static inline u32 transport_get_sectors_16(unsigned char *cdb)
273 {
274 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
275 (cdb[12] << 8) + cdb[13];
276 }
277
278 /*
279 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
280 */
281 static inline u32 transport_get_sectors_32(unsigned char *cdb)
282 {
283 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
284 (cdb[30] << 8) + cdb[31];
285
286 }
287
288 static inline u32 transport_lba_21(unsigned char *cdb)
289 {
290 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
291 }
292
293 static inline u32 transport_lba_32(unsigned char *cdb)
294 {
295 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
296 }
297
298 static inline unsigned long long transport_lba_64(unsigned char *cdb)
299 {
300 unsigned int __v1, __v2;
301
302 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
303 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
304
305 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
306 }
307
308 /*
309 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
310 */
311 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
312 {
313 unsigned int __v1, __v2;
314
315 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
316 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
317
318 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
319 }
320
321 static sense_reason_t
322 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
323 {
324 struct se_device *dev = cmd->se_dev;
325 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
326 unsigned int sectors = sbc_get_write_same_sectors(cmd);
327 sense_reason_t ret;
328
329 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
330 pr_err("WRITE_SAME PBDATA and LBDATA"
331 " bits not supported for Block Discard"
332 " Emulation\n");
333 return TCM_UNSUPPORTED_SCSI_OPCODE;
334 }
335 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
336 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
337 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
338 return TCM_INVALID_CDB_FIELD;
339 }
340 /*
341 * Sanity check for LBA wrap and request past end of device.
342 */
343 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
344 ((cmd->t_task_lba + sectors) > end_lba)) {
345 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
346 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
347 return TCM_ADDRESS_OUT_OF_RANGE;
348 }
349
350 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
351 if (flags[0] & 0x10) {
352 pr_warn("WRITE SAME with ANCHOR not supported\n");
353 return TCM_INVALID_CDB_FIELD;
354 }
355 /*
356 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
357 * translated into block discard requests within backend code.
358 */
359 if (flags[0] & 0x08) {
360 if (!ops->execute_unmap)
361 return TCM_UNSUPPORTED_SCSI_OPCODE;
362
363 if (!dev->dev_attrib.emulate_tpws) {
364 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
365 " has emulate_tpws disabled\n");
366 return TCM_UNSUPPORTED_SCSI_OPCODE;
367 }
368 cmd->execute_cmd = sbc_execute_write_same_unmap;
369 return 0;
370 }
371 if (!ops->execute_write_same)
372 return TCM_UNSUPPORTED_SCSI_OPCODE;
373
374 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
375 if (ret)
376 return ret;
377
378 cmd->execute_cmd = ops->execute_write_same;
379 return 0;
380 }
381
382 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success,
383 int *post_ret)
384 {
385 unsigned char *buf, *addr;
386 struct scatterlist *sg;
387 unsigned int offset;
388 sense_reason_t ret = TCM_NO_SENSE;
389 int i, count;
390 /*
391 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
392 *
393 * 1) read the specified logical block(s);
394 * 2) transfer logical blocks from the data-out buffer;
395 * 3) XOR the logical blocks transferred from the data-out buffer with
396 * the logical blocks read, storing the resulting XOR data in a buffer;
397 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
398 * blocks transferred from the data-out buffer; and
399 * 5) transfer the resulting XOR data to the data-in buffer.
400 */
401 buf = kmalloc(cmd->data_length, GFP_KERNEL);
402 if (!buf) {
403 pr_err("Unable to allocate xor_callback buf\n");
404 return TCM_OUT_OF_RESOURCES;
405 }
406 /*
407 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
408 * into the locally allocated *buf
409 */
410 sg_copy_to_buffer(cmd->t_data_sg,
411 cmd->t_data_nents,
412 buf,
413 cmd->data_length);
414
415 /*
416 * Now perform the XOR against the BIDI read memory located at
417 * cmd->t_mem_bidi_list
418 */
419
420 offset = 0;
421 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
422 addr = kmap_atomic(sg_page(sg));
423 if (!addr) {
424 ret = TCM_OUT_OF_RESOURCES;
425 goto out;
426 }
427
428 for (i = 0; i < sg->length; i++)
429 *(addr + sg->offset + i) ^= *(buf + offset + i);
430
431 offset += sg->length;
432 kunmap_atomic(addr);
433 }
434
435 out:
436 kfree(buf);
437 return ret;
438 }
439
440 static sense_reason_t
441 sbc_execute_rw(struct se_cmd *cmd)
442 {
443 struct sbc_ops *ops = cmd->protocol_data;
444
445 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
446 cmd->data_direction);
447 }
448
449 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success,
450 int *post_ret)
451 {
452 struct se_device *dev = cmd->se_dev;
453
454 /*
455 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
456 * within target_complete_ok_work() if the command was successfully
457 * sent to the backend driver.
458 */
459 spin_lock_irq(&cmd->t_state_lock);
460 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) {
461 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
462 *post_ret = 1;
463 }
464 spin_unlock_irq(&cmd->t_state_lock);
465
466 /*
467 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
468 * before the original READ I/O submission.
469 */
470 up(&dev->caw_sem);
471
472 return TCM_NO_SENSE;
473 }
474
475 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
476 int *post_ret)
477 {
478 struct se_device *dev = cmd->se_dev;
479 struct scatterlist *write_sg = NULL, *sg;
480 unsigned char *buf = NULL, *addr;
481 struct sg_mapping_iter m;
482 unsigned int offset = 0, len;
483 unsigned int nlbas = cmd->t_task_nolb;
484 unsigned int block_size = dev->dev_attrib.block_size;
485 unsigned int compare_len = (nlbas * block_size);
486 sense_reason_t ret = TCM_NO_SENSE;
487 int rc, i;
488
489 /*
490 * Handle early failure in transport_generic_request_failure(),
491 * which will not have taken ->caw_sem yet..
492 */
493 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
494 return TCM_NO_SENSE;
495 /*
496 * Handle special case for zero-length COMPARE_AND_WRITE
497 */
498 if (!cmd->data_length)
499 goto out;
500 /*
501 * Immediately exit + release dev->caw_sem if command has already
502 * been failed with a non-zero SCSI status.
503 */
504 if (cmd->scsi_status) {
505 pr_err("compare_and_write_callback: non zero scsi_status:"
506 " 0x%02x\n", cmd->scsi_status);
507 goto out;
508 }
509
510 buf = kzalloc(cmd->data_length, GFP_KERNEL);
511 if (!buf) {
512 pr_err("Unable to allocate compare_and_write buf\n");
513 ret = TCM_OUT_OF_RESOURCES;
514 goto out;
515 }
516
517 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
518 GFP_KERNEL);
519 if (!write_sg) {
520 pr_err("Unable to allocate compare_and_write sg\n");
521 ret = TCM_OUT_OF_RESOURCES;
522 goto out;
523 }
524 sg_init_table(write_sg, cmd->t_data_nents);
525 /*
526 * Setup verify and write data payloads from total NumberLBAs.
527 */
528 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
529 cmd->data_length);
530 if (!rc) {
531 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
532 ret = TCM_OUT_OF_RESOURCES;
533 goto out;
534 }
535 /*
536 * Compare against SCSI READ payload against verify payload
537 */
538 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
539 addr = (unsigned char *)kmap_atomic(sg_page(sg));
540 if (!addr) {
541 ret = TCM_OUT_OF_RESOURCES;
542 goto out;
543 }
544
545 len = min(sg->length, compare_len);
546
547 if (memcmp(addr, buf + offset, len)) {
548 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
549 addr, buf + offset);
550 kunmap_atomic(addr);
551 goto miscompare;
552 }
553 kunmap_atomic(addr);
554
555 offset += len;
556 compare_len -= len;
557 if (!compare_len)
558 break;
559 }
560
561 i = 0;
562 len = cmd->t_task_nolb * block_size;
563 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
564 /*
565 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
566 */
567 while (len) {
568 sg_miter_next(&m);
569
570 if (block_size < PAGE_SIZE) {
571 sg_set_page(&write_sg[i], m.page, block_size,
572 m.piter.sg->offset + block_size);
573 } else {
574 sg_miter_next(&m);
575 sg_set_page(&write_sg[i], m.page, block_size,
576 m.piter.sg->offset);
577 }
578 len -= block_size;
579 i++;
580 }
581 sg_miter_stop(&m);
582 /*
583 * Save the original SGL + nents values before updating to new
584 * assignments, to be released in transport_free_pages() ->
585 * transport_reset_sgl_orig()
586 */
587 cmd->t_data_sg_orig = cmd->t_data_sg;
588 cmd->t_data_sg = write_sg;
589 cmd->t_data_nents_orig = cmd->t_data_nents;
590 cmd->t_data_nents = 1;
591
592 cmd->sam_task_attr = TCM_HEAD_TAG;
593 cmd->transport_complete_callback = compare_and_write_post;
594 /*
595 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
596 * for submitting the adjusted SGL to write instance user-data.
597 */
598 cmd->execute_cmd = sbc_execute_rw;
599
600 spin_lock_irq(&cmd->t_state_lock);
601 cmd->t_state = TRANSPORT_PROCESSING;
602 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
603 spin_unlock_irq(&cmd->t_state_lock);
604
605 __target_execute_cmd(cmd);
606
607 kfree(buf);
608 return ret;
609
610 miscompare:
611 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
612 dev->transport->name);
613 ret = TCM_MISCOMPARE_VERIFY;
614 out:
615 /*
616 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
617 * sbc_compare_and_write() before the original READ I/O submission.
618 */
619 up(&dev->caw_sem);
620 kfree(write_sg);
621 kfree(buf);
622 return ret;
623 }
624
625 static sense_reason_t
626 sbc_compare_and_write(struct se_cmd *cmd)
627 {
628 struct sbc_ops *ops = cmd->protocol_data;
629 struct se_device *dev = cmd->se_dev;
630 sense_reason_t ret;
631 int rc;
632 /*
633 * Submit the READ first for COMPARE_AND_WRITE to perform the
634 * comparision using SGLs at cmd->t_bidi_data_sg..
635 */
636 rc = down_interruptible(&dev->caw_sem);
637 if (rc != 0) {
638 cmd->transport_complete_callback = NULL;
639 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
640 }
641 /*
642 * Reset cmd->data_length to individual block_size in order to not
643 * confuse backend drivers that depend on this value matching the
644 * size of the I/O being submitted.
645 */
646 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
647
648 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
649 DMA_FROM_DEVICE);
650 if (ret) {
651 cmd->transport_complete_callback = NULL;
652 up(&dev->caw_sem);
653 return ret;
654 }
655 /*
656 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
657 * upon MISCOMPARE, or in compare_and_write_done() upon completion
658 * of WRITE instance user-data.
659 */
660 return TCM_NO_SENSE;
661 }
662
663 static int
664 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
665 bool is_write, struct se_cmd *cmd)
666 {
667 if (is_write) {
668 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
669 protect ? TARGET_PROT_DOUT_PASS :
670 TARGET_PROT_DOUT_INSERT;
671 switch (protect) {
672 case 0x0:
673 case 0x3:
674 cmd->prot_checks = 0;
675 break;
676 case 0x1:
677 case 0x5:
678 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
679 if (prot_type == TARGET_DIF_TYPE1_PROT)
680 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
681 break;
682 case 0x2:
683 if (prot_type == TARGET_DIF_TYPE1_PROT)
684 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
685 break;
686 case 0x4:
687 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
688 break;
689 default:
690 pr_err("Unsupported protect field %d\n", protect);
691 return -EINVAL;
692 }
693 } else {
694 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
695 protect ? TARGET_PROT_DIN_PASS :
696 TARGET_PROT_DIN_STRIP;
697 switch (protect) {
698 case 0x0:
699 case 0x1:
700 case 0x5:
701 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
702 if (prot_type == TARGET_DIF_TYPE1_PROT)
703 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
704 break;
705 case 0x2:
706 if (prot_type == TARGET_DIF_TYPE1_PROT)
707 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
708 break;
709 case 0x3:
710 cmd->prot_checks = 0;
711 break;
712 case 0x4:
713 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
714 break;
715 default:
716 pr_err("Unsupported protect field %d\n", protect);
717 return -EINVAL;
718 }
719 }
720
721 return 0;
722 }
723
724 static sense_reason_t
725 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
726 u32 sectors, bool is_write)
727 {
728 u8 protect = cdb[1] >> 5;
729 int sp_ops = cmd->se_sess->sup_prot_ops;
730 int pi_prot_type = dev->dev_attrib.pi_prot_type;
731 bool fabric_prot = false;
732
733 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
734 if (unlikely(protect &&
735 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
736 pr_err("CDB contains protect bit, but device + fabric does"
737 " not advertise PROTECT=1 feature bit\n");
738 return TCM_INVALID_CDB_FIELD;
739 }
740 if (cmd->prot_pto)
741 return TCM_NO_SENSE;
742 }
743
744 switch (dev->dev_attrib.pi_prot_type) {
745 case TARGET_DIF_TYPE3_PROT:
746 cmd->reftag_seed = 0xffffffff;
747 break;
748 case TARGET_DIF_TYPE2_PROT:
749 if (protect)
750 return TCM_INVALID_CDB_FIELD;
751
752 cmd->reftag_seed = cmd->t_task_lba;
753 break;
754 case TARGET_DIF_TYPE1_PROT:
755 cmd->reftag_seed = cmd->t_task_lba;
756 break;
757 case TARGET_DIF_TYPE0_PROT:
758 /*
759 * See if the fabric supports T10-PI, and the session has been
760 * configured to allow export PROTECT=1 feature bit with backend
761 * devices that don't support T10-PI.
762 */
763 fabric_prot = is_write ?
764 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
765 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
766
767 if (fabric_prot && cmd->se_sess->sess_prot_type) {
768 pi_prot_type = cmd->se_sess->sess_prot_type;
769 break;
770 }
771 if (!protect)
772 return TCM_NO_SENSE;
773 /* Fallthrough */
774 default:
775 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
776 "PROTECT: 0x%02x\n", cdb[0], protect);
777 return TCM_INVALID_CDB_FIELD;
778 }
779
780 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
781 return TCM_INVALID_CDB_FIELD;
782
783 cmd->prot_type = pi_prot_type;
784 cmd->prot_length = dev->prot_length * sectors;
785
786 /**
787 * In case protection information exists over the wire
788 * we modify command data length to describe pure data.
789 * The actual transfer length is data length + protection
790 * length
791 **/
792 if (protect)
793 cmd->data_length = sectors * dev->dev_attrib.block_size;
794
795 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
796 "prot_op=%d prot_checks=%d\n",
797 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
798 cmd->prot_op, cmd->prot_checks);
799
800 return TCM_NO_SENSE;
801 }
802
803 static int
804 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
805 {
806 if (cdb[1] & 0x10) {
807 /* see explanation in spc_emulate_modesense */
808 if (!target_check_fua(dev)) {
809 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
810 " does not advertise support for DPO\n", cdb[0]);
811 return -EINVAL;
812 }
813 }
814 if (cdb[1] & 0x8) {
815 if (!target_check_fua(dev)) {
816 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
817 " does not advertise support for FUA write\n",
818 cdb[0]);
819 return -EINVAL;
820 }
821 cmd->se_cmd_flags |= SCF_FUA;
822 }
823 return 0;
824 }
825
826 sense_reason_t
827 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
828 {
829 struct se_device *dev = cmd->se_dev;
830 unsigned char *cdb = cmd->t_task_cdb;
831 unsigned int size;
832 u32 sectors = 0;
833 sense_reason_t ret;
834
835 cmd->protocol_data = ops;
836
837 switch (cdb[0]) {
838 case READ_6:
839 sectors = transport_get_sectors_6(cdb);
840 cmd->t_task_lba = transport_lba_21(cdb);
841 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
842 cmd->execute_cmd = sbc_execute_rw;
843 break;
844 case READ_10:
845 sectors = transport_get_sectors_10(cdb);
846 cmd->t_task_lba = transport_lba_32(cdb);
847
848 if (sbc_check_dpofua(dev, cmd, cdb))
849 return TCM_INVALID_CDB_FIELD;
850
851 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
852 if (ret)
853 return ret;
854
855 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
856 cmd->execute_cmd = sbc_execute_rw;
857 break;
858 case READ_12:
859 sectors = transport_get_sectors_12(cdb);
860 cmd->t_task_lba = transport_lba_32(cdb);
861
862 if (sbc_check_dpofua(dev, cmd, cdb))
863 return TCM_INVALID_CDB_FIELD;
864
865 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
866 if (ret)
867 return ret;
868
869 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
870 cmd->execute_cmd = sbc_execute_rw;
871 break;
872 case READ_16:
873 sectors = transport_get_sectors_16(cdb);
874 cmd->t_task_lba = transport_lba_64(cdb);
875
876 if (sbc_check_dpofua(dev, cmd, cdb))
877 return TCM_INVALID_CDB_FIELD;
878
879 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
880 if (ret)
881 return ret;
882
883 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
884 cmd->execute_cmd = sbc_execute_rw;
885 break;
886 case WRITE_6:
887 sectors = transport_get_sectors_6(cdb);
888 cmd->t_task_lba = transport_lba_21(cdb);
889 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
890 cmd->execute_cmd = sbc_execute_rw;
891 break;
892 case WRITE_10:
893 case WRITE_VERIFY:
894 sectors = transport_get_sectors_10(cdb);
895 cmd->t_task_lba = transport_lba_32(cdb);
896
897 if (sbc_check_dpofua(dev, cmd, cdb))
898 return TCM_INVALID_CDB_FIELD;
899
900 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
901 if (ret)
902 return ret;
903
904 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
905 cmd->execute_cmd = sbc_execute_rw;
906 break;
907 case WRITE_12:
908 sectors = transport_get_sectors_12(cdb);
909 cmd->t_task_lba = transport_lba_32(cdb);
910
911 if (sbc_check_dpofua(dev, cmd, cdb))
912 return TCM_INVALID_CDB_FIELD;
913
914 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
915 if (ret)
916 return ret;
917
918 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
919 cmd->execute_cmd = sbc_execute_rw;
920 break;
921 case WRITE_16:
922 sectors = transport_get_sectors_16(cdb);
923 cmd->t_task_lba = transport_lba_64(cdb);
924
925 if (sbc_check_dpofua(dev, cmd, cdb))
926 return TCM_INVALID_CDB_FIELD;
927
928 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
929 if (ret)
930 return ret;
931
932 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
933 cmd->execute_cmd = sbc_execute_rw;
934 break;
935 case XDWRITEREAD_10:
936 if (cmd->data_direction != DMA_TO_DEVICE ||
937 !(cmd->se_cmd_flags & SCF_BIDI))
938 return TCM_INVALID_CDB_FIELD;
939 sectors = transport_get_sectors_10(cdb);
940
941 if (sbc_check_dpofua(dev, cmd, cdb))
942 return TCM_INVALID_CDB_FIELD;
943
944 cmd->t_task_lba = transport_lba_32(cdb);
945 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
946
947 /*
948 * Setup BIDI XOR callback to be run after I/O completion.
949 */
950 cmd->execute_cmd = sbc_execute_rw;
951 cmd->transport_complete_callback = &xdreadwrite_callback;
952 break;
953 case VARIABLE_LENGTH_CMD:
954 {
955 u16 service_action = get_unaligned_be16(&cdb[8]);
956 switch (service_action) {
957 case XDWRITEREAD_32:
958 sectors = transport_get_sectors_32(cdb);
959
960 if (sbc_check_dpofua(dev, cmd, cdb))
961 return TCM_INVALID_CDB_FIELD;
962 /*
963 * Use WRITE_32 and READ_32 opcodes for the emulated
964 * XDWRITE_READ_32 logic.
965 */
966 cmd->t_task_lba = transport_lba_64_ext(cdb);
967 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
968
969 /*
970 * Setup BIDI XOR callback to be run during after I/O
971 * completion.
972 */
973 cmd->execute_cmd = sbc_execute_rw;
974 cmd->transport_complete_callback = &xdreadwrite_callback;
975 break;
976 case WRITE_SAME_32:
977 sectors = transport_get_sectors_32(cdb);
978 if (!sectors) {
979 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
980 " supported\n");
981 return TCM_INVALID_CDB_FIELD;
982 }
983
984 size = sbc_get_size(cmd, 1);
985 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
986
987 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
988 if (ret)
989 return ret;
990 break;
991 default:
992 pr_err("VARIABLE_LENGTH_CMD service action"
993 " 0x%04x not supported\n", service_action);
994 return TCM_UNSUPPORTED_SCSI_OPCODE;
995 }
996 break;
997 }
998 case COMPARE_AND_WRITE:
999 sectors = cdb[13];
1000 /*
1001 * Currently enforce COMPARE_AND_WRITE for a single sector
1002 */
1003 if (sectors > 1) {
1004 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
1005 " than 1\n", sectors);
1006 return TCM_INVALID_CDB_FIELD;
1007 }
1008 if (sbc_check_dpofua(dev, cmd, cdb))
1009 return TCM_INVALID_CDB_FIELD;
1010
1011 /*
1012 * Double size because we have two buffers, note that
1013 * zero is not an error..
1014 */
1015 size = 2 * sbc_get_size(cmd, sectors);
1016 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1017 cmd->t_task_nolb = sectors;
1018 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
1019 cmd->execute_cmd = sbc_compare_and_write;
1020 cmd->transport_complete_callback = compare_and_write_callback;
1021 break;
1022 case READ_CAPACITY:
1023 size = READ_CAP_LEN;
1024 cmd->execute_cmd = sbc_emulate_readcapacity;
1025 break;
1026 case SERVICE_ACTION_IN_16:
1027 switch (cmd->t_task_cdb[1] & 0x1f) {
1028 case SAI_READ_CAPACITY_16:
1029 cmd->execute_cmd = sbc_emulate_readcapacity_16;
1030 break;
1031 case SAI_REPORT_REFERRALS:
1032 cmd->execute_cmd = target_emulate_report_referrals;
1033 break;
1034 default:
1035 pr_err("Unsupported SA: 0x%02x\n",
1036 cmd->t_task_cdb[1] & 0x1f);
1037 return TCM_INVALID_CDB_FIELD;
1038 }
1039 size = (cdb[10] << 24) | (cdb[11] << 16) |
1040 (cdb[12] << 8) | cdb[13];
1041 break;
1042 case SYNCHRONIZE_CACHE:
1043 case SYNCHRONIZE_CACHE_16:
1044 if (cdb[0] == SYNCHRONIZE_CACHE) {
1045 sectors = transport_get_sectors_10(cdb);
1046 cmd->t_task_lba = transport_lba_32(cdb);
1047 } else {
1048 sectors = transport_get_sectors_16(cdb);
1049 cmd->t_task_lba = transport_lba_64(cdb);
1050 }
1051 if (ops->execute_sync_cache) {
1052 cmd->execute_cmd = ops->execute_sync_cache;
1053 goto check_lba;
1054 }
1055 size = 0;
1056 cmd->execute_cmd = sbc_emulate_noop;
1057 break;
1058 case UNMAP:
1059 if (!ops->execute_unmap)
1060 return TCM_UNSUPPORTED_SCSI_OPCODE;
1061
1062 if (!dev->dev_attrib.emulate_tpu) {
1063 pr_err("Got UNMAP, but backend device has"
1064 " emulate_tpu disabled\n");
1065 return TCM_UNSUPPORTED_SCSI_OPCODE;
1066 }
1067 size = get_unaligned_be16(&cdb[7]);
1068 cmd->execute_cmd = sbc_execute_unmap;
1069 break;
1070 case WRITE_SAME_16:
1071 sectors = transport_get_sectors_16(cdb);
1072 if (!sectors) {
1073 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1074 return TCM_INVALID_CDB_FIELD;
1075 }
1076
1077 size = sbc_get_size(cmd, 1);
1078 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1079
1080 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1081 if (ret)
1082 return ret;
1083 break;
1084 case WRITE_SAME:
1085 sectors = transport_get_sectors_10(cdb);
1086 if (!sectors) {
1087 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1088 return TCM_INVALID_CDB_FIELD;
1089 }
1090
1091 size = sbc_get_size(cmd, 1);
1092 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1093
1094 /*
1095 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1096 * of byte 1 bit 3 UNMAP instead of original reserved field
1097 */
1098 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1099 if (ret)
1100 return ret;
1101 break;
1102 case VERIFY:
1103 size = 0;
1104 sectors = transport_get_sectors_10(cdb);
1105 cmd->t_task_lba = transport_lba_32(cdb);
1106 cmd->execute_cmd = sbc_emulate_noop;
1107 goto check_lba;
1108 case REZERO_UNIT:
1109 case SEEK_6:
1110 case SEEK_10:
1111 /*
1112 * There are still clients out there which use these old SCSI-2
1113 * commands. This mainly happens when running VMs with legacy
1114 * guest systems, connected via SCSI command pass-through to
1115 * iSCSI targets. Make them happy and return status GOOD.
1116 */
1117 size = 0;
1118 cmd->execute_cmd = sbc_emulate_noop;
1119 break;
1120 case START_STOP:
1121 size = 0;
1122 cmd->execute_cmd = sbc_emulate_startstop;
1123 break;
1124 default:
1125 ret = spc_parse_cdb(cmd, &size);
1126 if (ret)
1127 return ret;
1128 }
1129
1130 /* reject any command that we don't have a handler for */
1131 if (!cmd->execute_cmd)
1132 return TCM_UNSUPPORTED_SCSI_OPCODE;
1133
1134 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1135 unsigned long long end_lba;
1136 check_lba:
1137 end_lba = dev->transport->get_blocks(dev) + 1;
1138 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1139 ((cmd->t_task_lba + sectors) > end_lba)) {
1140 pr_err("cmd exceeds last lba %llu "
1141 "(lba %llu, sectors %u)\n",
1142 end_lba, cmd->t_task_lba, sectors);
1143 return TCM_ADDRESS_OUT_OF_RANGE;
1144 }
1145
1146 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1147 size = sbc_get_size(cmd, sectors);
1148 }
1149
1150 return target_cmd_size_check(cmd, size);
1151 }
1152 EXPORT_SYMBOL(sbc_parse_cdb);
1153
1154 u32 sbc_get_device_type(struct se_device *dev)
1155 {
1156 return TYPE_DISK;
1157 }
1158 EXPORT_SYMBOL(sbc_get_device_type);
1159
1160 static sense_reason_t
1161 sbc_execute_unmap(struct se_cmd *cmd)
1162 {
1163 struct sbc_ops *ops = cmd->protocol_data;
1164 struct se_device *dev = cmd->se_dev;
1165 unsigned char *buf, *ptr = NULL;
1166 sector_t lba;
1167 int size;
1168 u32 range;
1169 sense_reason_t ret = 0;
1170 int dl, bd_dl;
1171
1172 /* We never set ANC_SUP */
1173 if (cmd->t_task_cdb[1])
1174 return TCM_INVALID_CDB_FIELD;
1175
1176 if (cmd->data_length == 0) {
1177 target_complete_cmd(cmd, SAM_STAT_GOOD);
1178 return 0;
1179 }
1180
1181 if (cmd->data_length < 8) {
1182 pr_warn("UNMAP parameter list length %u too small\n",
1183 cmd->data_length);
1184 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1185 }
1186
1187 buf = transport_kmap_data_sg(cmd);
1188 if (!buf)
1189 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1190
1191 dl = get_unaligned_be16(&buf[0]);
1192 bd_dl = get_unaligned_be16(&buf[2]);
1193
1194 size = cmd->data_length - 8;
1195 if (bd_dl > size)
1196 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1197 cmd->data_length, bd_dl);
1198 else
1199 size = bd_dl;
1200
1201 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1202 ret = TCM_INVALID_PARAMETER_LIST;
1203 goto err;
1204 }
1205
1206 /* First UNMAP block descriptor starts at 8 byte offset */
1207 ptr = &buf[8];
1208 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1209 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1210
1211 while (size >= 16) {
1212 lba = get_unaligned_be64(&ptr[0]);
1213 range = get_unaligned_be32(&ptr[8]);
1214 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1215 (unsigned long long)lba, range);
1216
1217 if (range > dev->dev_attrib.max_unmap_lba_count) {
1218 ret = TCM_INVALID_PARAMETER_LIST;
1219 goto err;
1220 }
1221
1222 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1223 ret = TCM_ADDRESS_OUT_OF_RANGE;
1224 goto err;
1225 }
1226
1227 ret = ops->execute_unmap(cmd, lba, range);
1228 if (ret)
1229 goto err;
1230
1231 ptr += 16;
1232 size -= 16;
1233 }
1234
1235 err:
1236 transport_kunmap_data_sg(cmd);
1237 if (!ret)
1238 target_complete_cmd(cmd, GOOD);
1239 return ret;
1240 }
1241
1242 void
1243 sbc_dif_generate(struct se_cmd *cmd)
1244 {
1245 struct se_device *dev = cmd->se_dev;
1246 struct t10_pi_tuple *sdt;
1247 struct scatterlist *dsg = cmd->t_data_sg, *psg;
1248 sector_t sector = cmd->t_task_lba;
1249 void *daddr, *paddr;
1250 int i, j, offset = 0;
1251 unsigned int block_size = dev->dev_attrib.block_size;
1252
1253 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1254 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1255 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1256
1257 for (j = 0; j < psg->length;
1258 j += sizeof(*sdt)) {
1259 __u16 crc;
1260 unsigned int avail;
1261
1262 if (offset >= dsg->length) {
1263 offset -= dsg->length;
1264 kunmap_atomic(daddr - dsg->offset);
1265 dsg = sg_next(dsg);
1266 if (!dsg) {
1267 kunmap_atomic(paddr - psg->offset);
1268 return;
1269 }
1270 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1271 }
1272
1273 sdt = paddr + j;
1274 avail = min(block_size, dsg->length - offset);
1275 crc = crc_t10dif(daddr + offset, avail);
1276 if (avail < block_size) {
1277 kunmap_atomic(daddr - dsg->offset);
1278 dsg = sg_next(dsg);
1279 if (!dsg) {
1280 kunmap_atomic(paddr - psg->offset);
1281 return;
1282 }
1283 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1284 offset = block_size - avail;
1285 crc = crc_t10dif_update(crc, daddr, offset);
1286 } else {
1287 offset += block_size;
1288 }
1289
1290 sdt->guard_tag = cpu_to_be16(crc);
1291 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1292 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1293 sdt->app_tag = 0;
1294
1295 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1296 " app_tag: 0x%04x ref_tag: %u\n",
1297 (cmd->data_direction == DMA_TO_DEVICE) ?
1298 "WRITE" : "READ", (unsigned long long)sector,
1299 sdt->guard_tag, sdt->app_tag,
1300 be32_to_cpu(sdt->ref_tag));
1301
1302 sector++;
1303 }
1304
1305 kunmap_atomic(daddr - dsg->offset);
1306 kunmap_atomic(paddr - psg->offset);
1307 }
1308 }
1309
1310 static sense_reason_t
1311 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt,
1312 __u16 crc, sector_t sector, unsigned int ei_lba)
1313 {
1314 __be16 csum;
1315
1316 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1317 goto check_ref;
1318
1319 csum = cpu_to_be16(crc);
1320
1321 if (sdt->guard_tag != csum) {
1322 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1323 " csum 0x%04x\n", (unsigned long long)sector,
1324 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1325 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1326 }
1327
1328 check_ref:
1329 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1330 return 0;
1331
1332 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1333 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1334 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1335 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1336 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1337 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1338 }
1339
1340 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1341 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1342 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1343 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1344 be32_to_cpu(sdt->ref_tag), ei_lba);
1345 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1346 }
1347
1348 return 0;
1349 }
1350
1351 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1352 struct scatterlist *sg, int sg_off)
1353 {
1354 struct se_device *dev = cmd->se_dev;
1355 struct scatterlist *psg;
1356 void *paddr, *addr;
1357 unsigned int i, len, left;
1358 unsigned int offset = sg_off;
1359
1360 if (!sg)
1361 return;
1362
1363 left = sectors * dev->prot_length;
1364
1365 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1366 unsigned int psg_len, copied = 0;
1367
1368 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1369 psg_len = min(left, psg->length);
1370 while (psg_len) {
1371 len = min(psg_len, sg->length - offset);
1372 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1373
1374 if (read)
1375 memcpy(paddr + copied, addr, len);
1376 else
1377 memcpy(addr, paddr + copied, len);
1378
1379 left -= len;
1380 offset += len;
1381 copied += len;
1382 psg_len -= len;
1383
1384 kunmap_atomic(addr - sg->offset - offset);
1385
1386 if (offset >= sg->length) {
1387 sg = sg_next(sg);
1388 offset = 0;
1389 }
1390 }
1391 kunmap_atomic(paddr - psg->offset);
1392 }
1393 }
1394 EXPORT_SYMBOL(sbc_dif_copy_prot);
1395
1396 sense_reason_t
1397 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1398 unsigned int ei_lba, struct scatterlist *psg, int psg_off)
1399 {
1400 struct se_device *dev = cmd->se_dev;
1401 struct t10_pi_tuple *sdt;
1402 struct scatterlist *dsg = cmd->t_data_sg;
1403 sector_t sector = start;
1404 void *daddr, *paddr;
1405 int i;
1406 sense_reason_t rc;
1407 int dsg_off = 0;
1408 unsigned int block_size = dev->dev_attrib.block_size;
1409
1410 for (; psg && sector < start + sectors; psg = sg_next(psg)) {
1411 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1412 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1413
1414 for (i = psg_off; i < psg->length &&
1415 sector < start + sectors;
1416 i += sizeof(*sdt)) {
1417 __u16 crc;
1418 unsigned int avail;
1419
1420 if (dsg_off >= dsg->length) {
1421 dsg_off -= dsg->length;
1422 kunmap_atomic(daddr - dsg->offset);
1423 dsg = sg_next(dsg);
1424 if (!dsg) {
1425 kunmap_atomic(paddr - psg->offset);
1426 return 0;
1427 }
1428 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1429 }
1430
1431 sdt = paddr + i;
1432
1433 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1434 " app_tag: 0x%04x ref_tag: %u\n",
1435 (unsigned long long)sector, sdt->guard_tag,
1436 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1437
1438 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1439 dsg_off += block_size;
1440 goto next;
1441 }
1442
1443 avail = min(block_size, dsg->length - dsg_off);
1444 crc = crc_t10dif(daddr + dsg_off, avail);
1445 if (avail < block_size) {
1446 kunmap_atomic(daddr - dsg->offset);
1447 dsg = sg_next(dsg);
1448 if (!dsg) {
1449 kunmap_atomic(paddr - psg->offset);
1450 return 0;
1451 }
1452 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1453 dsg_off = block_size - avail;
1454 crc = crc_t10dif_update(crc, daddr, dsg_off);
1455 } else {
1456 dsg_off += block_size;
1457 }
1458
1459 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
1460 if (rc) {
1461 kunmap_atomic(daddr - dsg->offset);
1462 kunmap_atomic(paddr - psg->offset);
1463 cmd->bad_sector = sector;
1464 return rc;
1465 }
1466 next:
1467 sector++;
1468 ei_lba++;
1469 }
1470
1471 psg_off = 0;
1472 kunmap_atomic(daddr - dsg->offset);
1473 kunmap_atomic(paddr - psg->offset);
1474 }
1475
1476 return 0;
1477 }
1478 EXPORT_SYMBOL(sbc_dif_verify);
Linux kernel - Deliverables
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