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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[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 rbuf = transport_kmap_data_sg(cmd);
148 if (rbuf) {
149 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
150 transport_kunmap_data_sg(cmd);
151 }
152
153 target_complete_cmd_with_length(cmd, GOOD, 32);
154 return 0;
155 }
156
157 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
158 {
159 u32 num_blocks;
160
161 if (cmd->t_task_cdb[0] == WRITE_SAME)
162 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
163 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
164 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
165 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
166 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
167
168 /*
169 * Use the explicit range when non zero is supplied, otherwise calculate
170 * the remaining range based on ->get_blocks() - starting LBA.
171 */
172 if (num_blocks)
173 return num_blocks;
174
175 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
176 cmd->t_task_lba + 1;
177 }
178 EXPORT_SYMBOL(sbc_get_write_same_sectors);
179
180 static sense_reason_t
181 sbc_execute_write_same_unmap(struct se_cmd *cmd)
182 {
183 struct sbc_ops *ops = cmd->protocol_data;
184 sector_t nolb = sbc_get_write_same_sectors(cmd);
185 sense_reason_t ret;
186
187 if (nolb) {
188 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb);
189 if (ret)
190 return ret;
191 }
192
193 target_complete_cmd(cmd, GOOD);
194 return 0;
195 }
196
197 static sense_reason_t
198 sbc_emulate_noop(struct se_cmd *cmd)
199 {
200 target_complete_cmd(cmd, GOOD);
201 return 0;
202 }
203
204 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
205 {
206 return cmd->se_dev->dev_attrib.block_size * sectors;
207 }
208
209 static inline u32 transport_get_sectors_6(unsigned char *cdb)
210 {
211 /*
212 * Use 8-bit sector value. SBC-3 says:
213 *
214 * A TRANSFER LENGTH field set to zero specifies that 256
215 * logical blocks shall be written. Any other value
216 * specifies the number of logical blocks that shall be
217 * written.
218 */
219 return cdb[4] ? : 256;
220 }
221
222 static inline u32 transport_get_sectors_10(unsigned char *cdb)
223 {
224 return (u32)(cdb[7] << 8) + cdb[8];
225 }
226
227 static inline u32 transport_get_sectors_12(unsigned char *cdb)
228 {
229 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
230 }
231
232 static inline u32 transport_get_sectors_16(unsigned char *cdb)
233 {
234 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
235 (cdb[12] << 8) + cdb[13];
236 }
237
238 /*
239 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
240 */
241 static inline u32 transport_get_sectors_32(unsigned char *cdb)
242 {
243 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
244 (cdb[30] << 8) + cdb[31];
245
246 }
247
248 static inline u32 transport_lba_21(unsigned char *cdb)
249 {
250 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
251 }
252
253 static inline u32 transport_lba_32(unsigned char *cdb)
254 {
255 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
256 }
257
258 static inline unsigned long long transport_lba_64(unsigned char *cdb)
259 {
260 unsigned int __v1, __v2;
261
262 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
263 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
264
265 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
266 }
267
268 /*
269 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
270 */
271 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
272 {
273 unsigned int __v1, __v2;
274
275 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
276 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
277
278 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
279 }
280
281 static sense_reason_t
282 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
283 {
284 struct se_device *dev = cmd->se_dev;
285 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
286 unsigned int sectors = sbc_get_write_same_sectors(cmd);
287 sense_reason_t ret;
288
289 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
290 pr_err("WRITE_SAME PBDATA and LBDATA"
291 " bits not supported for Block Discard"
292 " Emulation\n");
293 return TCM_UNSUPPORTED_SCSI_OPCODE;
294 }
295 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
296 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
297 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
298 return TCM_INVALID_CDB_FIELD;
299 }
300 /*
301 * Sanity check for LBA wrap and request past end of device.
302 */
303 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
304 ((cmd->t_task_lba + sectors) > end_lba)) {
305 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
306 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
307 return TCM_ADDRESS_OUT_OF_RANGE;
308 }
309
310 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
311 if (flags[0] & 0x10) {
312 pr_warn("WRITE SAME with ANCHOR not supported\n");
313 return TCM_INVALID_CDB_FIELD;
314 }
315 /*
316 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
317 * translated into block discard requests within backend code.
318 */
319 if (flags[0] & 0x08) {
320 if (!ops->execute_unmap)
321 return TCM_UNSUPPORTED_SCSI_OPCODE;
322
323 if (!dev->dev_attrib.emulate_tpws) {
324 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
325 " has emulate_tpws disabled\n");
326 return TCM_UNSUPPORTED_SCSI_OPCODE;
327 }
328 cmd->execute_cmd = sbc_execute_write_same_unmap;
329 return 0;
330 }
331 if (!ops->execute_write_same)
332 return TCM_UNSUPPORTED_SCSI_OPCODE;
333
334 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
335 if (ret)
336 return ret;
337
338 cmd->execute_cmd = ops->execute_write_same;
339 return 0;
340 }
341
342 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success)
343 {
344 unsigned char *buf, *addr;
345 struct scatterlist *sg;
346 unsigned int offset;
347 sense_reason_t ret = TCM_NO_SENSE;
348 int i, count;
349 /*
350 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
351 *
352 * 1) read the specified logical block(s);
353 * 2) transfer logical blocks from the data-out buffer;
354 * 3) XOR the logical blocks transferred from the data-out buffer with
355 * the logical blocks read, storing the resulting XOR data in a buffer;
356 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
357 * blocks transferred from the data-out buffer; and
358 * 5) transfer the resulting XOR data to the data-in buffer.
359 */
360 buf = kmalloc(cmd->data_length, GFP_KERNEL);
361 if (!buf) {
362 pr_err("Unable to allocate xor_callback buf\n");
363 return TCM_OUT_OF_RESOURCES;
364 }
365 /*
366 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
367 * into the locally allocated *buf
368 */
369 sg_copy_to_buffer(cmd->t_data_sg,
370 cmd->t_data_nents,
371 buf,
372 cmd->data_length);
373
374 /*
375 * Now perform the XOR against the BIDI read memory located at
376 * cmd->t_mem_bidi_list
377 */
378
379 offset = 0;
380 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
381 addr = kmap_atomic(sg_page(sg));
382 if (!addr) {
383 ret = TCM_OUT_OF_RESOURCES;
384 goto out;
385 }
386
387 for (i = 0; i < sg->length; i++)
388 *(addr + sg->offset + i) ^= *(buf + offset + i);
389
390 offset += sg->length;
391 kunmap_atomic(addr);
392 }
393
394 out:
395 kfree(buf);
396 return ret;
397 }
398
399 static sense_reason_t
400 sbc_execute_rw(struct se_cmd *cmd)
401 {
402 struct sbc_ops *ops = cmd->protocol_data;
403
404 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
405 cmd->data_direction);
406 }
407
408 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success)
409 {
410 struct se_device *dev = cmd->se_dev;
411
412 /*
413 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
414 * within target_complete_ok_work() if the command was successfully
415 * sent to the backend driver.
416 */
417 spin_lock_irq(&cmd->t_state_lock);
418 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
419 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
420 spin_unlock_irq(&cmd->t_state_lock);
421
422 /*
423 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
424 * before the original READ I/O submission.
425 */
426 up(&dev->caw_sem);
427
428 return TCM_NO_SENSE;
429 }
430
431 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success)
432 {
433 struct se_device *dev = cmd->se_dev;
434 struct scatterlist *write_sg = NULL, *sg;
435 unsigned char *buf = NULL, *addr;
436 struct sg_mapping_iter m;
437 unsigned int offset = 0, len;
438 unsigned int nlbas = cmd->t_task_nolb;
439 unsigned int block_size = dev->dev_attrib.block_size;
440 unsigned int compare_len = (nlbas * block_size);
441 sense_reason_t ret = TCM_NO_SENSE;
442 int rc, i;
443
444 /*
445 * Handle early failure in transport_generic_request_failure(),
446 * which will not have taken ->caw_sem yet..
447 */
448 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
449 return TCM_NO_SENSE;
450 /*
451 * Handle special case for zero-length COMPARE_AND_WRITE
452 */
453 if (!cmd->data_length)
454 goto out;
455 /*
456 * Immediately exit + release dev->caw_sem if command has already
457 * been failed with a non-zero SCSI status.
458 */
459 if (cmd->scsi_status) {
460 pr_err("compare_and_write_callback: non zero scsi_status:"
461 " 0x%02x\n", cmd->scsi_status);
462 goto out;
463 }
464
465 buf = kzalloc(cmd->data_length, GFP_KERNEL);
466 if (!buf) {
467 pr_err("Unable to allocate compare_and_write buf\n");
468 ret = TCM_OUT_OF_RESOURCES;
469 goto out;
470 }
471
472 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
473 GFP_KERNEL);
474 if (!write_sg) {
475 pr_err("Unable to allocate compare_and_write sg\n");
476 ret = TCM_OUT_OF_RESOURCES;
477 goto out;
478 }
479 sg_init_table(write_sg, cmd->t_data_nents);
480 /*
481 * Setup verify and write data payloads from total NumberLBAs.
482 */
483 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
484 cmd->data_length);
485 if (!rc) {
486 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
487 ret = TCM_OUT_OF_RESOURCES;
488 goto out;
489 }
490 /*
491 * Compare against SCSI READ payload against verify payload
492 */
493 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
494 addr = (unsigned char *)kmap_atomic(sg_page(sg));
495 if (!addr) {
496 ret = TCM_OUT_OF_RESOURCES;
497 goto out;
498 }
499
500 len = min(sg->length, compare_len);
501
502 if (memcmp(addr, buf + offset, len)) {
503 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
504 addr, buf + offset);
505 kunmap_atomic(addr);
506 goto miscompare;
507 }
508 kunmap_atomic(addr);
509
510 offset += len;
511 compare_len -= len;
512 if (!compare_len)
513 break;
514 }
515
516 i = 0;
517 len = cmd->t_task_nolb * block_size;
518 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
519 /*
520 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
521 */
522 while (len) {
523 sg_miter_next(&m);
524
525 if (block_size < PAGE_SIZE) {
526 sg_set_page(&write_sg[i], m.page, block_size,
527 block_size);
528 } else {
529 sg_miter_next(&m);
530 sg_set_page(&write_sg[i], m.page, block_size,
531 0);
532 }
533 len -= block_size;
534 i++;
535 }
536 sg_miter_stop(&m);
537 /*
538 * Save the original SGL + nents values before updating to new
539 * assignments, to be released in transport_free_pages() ->
540 * transport_reset_sgl_orig()
541 */
542 cmd->t_data_sg_orig = cmd->t_data_sg;
543 cmd->t_data_sg = write_sg;
544 cmd->t_data_nents_orig = cmd->t_data_nents;
545 cmd->t_data_nents = 1;
546
547 cmd->sam_task_attr = TCM_HEAD_TAG;
548 cmd->transport_complete_callback = compare_and_write_post;
549 /*
550 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
551 * for submitting the adjusted SGL to write instance user-data.
552 */
553 cmd->execute_cmd = sbc_execute_rw;
554
555 spin_lock_irq(&cmd->t_state_lock);
556 cmd->t_state = TRANSPORT_PROCESSING;
557 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
558 spin_unlock_irq(&cmd->t_state_lock);
559
560 __target_execute_cmd(cmd);
561
562 kfree(buf);
563 return ret;
564
565 miscompare:
566 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
567 dev->transport->name);
568 ret = TCM_MISCOMPARE_VERIFY;
569 out:
570 /*
571 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
572 * sbc_compare_and_write() before the original READ I/O submission.
573 */
574 up(&dev->caw_sem);
575 kfree(write_sg);
576 kfree(buf);
577 return ret;
578 }
579
580 static sense_reason_t
581 sbc_compare_and_write(struct se_cmd *cmd)
582 {
583 struct sbc_ops *ops = cmd->protocol_data;
584 struct se_device *dev = cmd->se_dev;
585 sense_reason_t ret;
586 int rc;
587 /*
588 * Submit the READ first for COMPARE_AND_WRITE to perform the
589 * comparision using SGLs at cmd->t_bidi_data_sg..
590 */
591 rc = down_interruptible(&dev->caw_sem);
592 if (rc != 0) {
593 cmd->transport_complete_callback = NULL;
594 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
595 }
596 /*
597 * Reset cmd->data_length to individual block_size in order to not
598 * confuse backend drivers that depend on this value matching the
599 * size of the I/O being submitted.
600 */
601 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
602
603 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
604 DMA_FROM_DEVICE);
605 if (ret) {
606 cmd->transport_complete_callback = NULL;
607 up(&dev->caw_sem);
608 return ret;
609 }
610 /*
611 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
612 * upon MISCOMPARE, or in compare_and_write_done() upon completion
613 * of WRITE instance user-data.
614 */
615 return TCM_NO_SENSE;
616 }
617
618 static int
619 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
620 bool is_write, struct se_cmd *cmd)
621 {
622 if (is_write) {
623 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
624 protect ? TARGET_PROT_DOUT_PASS :
625 TARGET_PROT_DOUT_INSERT;
626 switch (protect) {
627 case 0x0:
628 case 0x3:
629 cmd->prot_checks = 0;
630 break;
631 case 0x1:
632 case 0x5:
633 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
634 if (prot_type == TARGET_DIF_TYPE1_PROT)
635 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
636 break;
637 case 0x2:
638 if (prot_type == TARGET_DIF_TYPE1_PROT)
639 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
640 break;
641 case 0x4:
642 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
643 break;
644 default:
645 pr_err("Unsupported protect field %d\n", protect);
646 return -EINVAL;
647 }
648 } else {
649 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
650 protect ? TARGET_PROT_DIN_PASS :
651 TARGET_PROT_DIN_STRIP;
652 switch (protect) {
653 case 0x0:
654 case 0x1:
655 case 0x5:
656 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
657 if (prot_type == TARGET_DIF_TYPE1_PROT)
658 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
659 break;
660 case 0x2:
661 if (prot_type == TARGET_DIF_TYPE1_PROT)
662 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
663 break;
664 case 0x3:
665 cmd->prot_checks = 0;
666 break;
667 case 0x4:
668 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
669 break;
670 default:
671 pr_err("Unsupported protect field %d\n", protect);
672 return -EINVAL;
673 }
674 }
675
676 return 0;
677 }
678
679 static sense_reason_t
680 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
681 u32 sectors, bool is_write)
682 {
683 u8 protect = cdb[1] >> 5;
684 int sp_ops = cmd->se_sess->sup_prot_ops;
685 int pi_prot_type = dev->dev_attrib.pi_prot_type;
686 bool fabric_prot = false;
687
688 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
689 if (unlikely(protect &&
690 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
691 pr_err("CDB contains protect bit, but device + fabric does"
692 " not advertise PROTECT=1 feature bit\n");
693 return TCM_INVALID_CDB_FIELD;
694 }
695 if (cmd->prot_pto)
696 return TCM_NO_SENSE;
697 }
698
699 switch (dev->dev_attrib.pi_prot_type) {
700 case TARGET_DIF_TYPE3_PROT:
701 cmd->reftag_seed = 0xffffffff;
702 break;
703 case TARGET_DIF_TYPE2_PROT:
704 if (protect)
705 return TCM_INVALID_CDB_FIELD;
706
707 cmd->reftag_seed = cmd->t_task_lba;
708 break;
709 case TARGET_DIF_TYPE1_PROT:
710 cmd->reftag_seed = cmd->t_task_lba;
711 break;
712 case TARGET_DIF_TYPE0_PROT:
713 /*
714 * See if the fabric supports T10-PI, and the session has been
715 * configured to allow export PROTECT=1 feature bit with backend
716 * devices that don't support T10-PI.
717 */
718 fabric_prot = is_write ?
719 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
720 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
721
722 if (fabric_prot && cmd->se_sess->sess_prot_type) {
723 pi_prot_type = cmd->se_sess->sess_prot_type;
724 break;
725 }
726 if (!protect)
727 return TCM_NO_SENSE;
728 /* Fallthrough */
729 default:
730 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
731 "PROTECT: 0x%02x\n", cdb[0], protect);
732 return TCM_INVALID_CDB_FIELD;
733 }
734
735 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
736 return TCM_INVALID_CDB_FIELD;
737
738 cmd->prot_type = pi_prot_type;
739 cmd->prot_length = dev->prot_length * sectors;
740
741 /**
742 * In case protection information exists over the wire
743 * we modify command data length to describe pure data.
744 * The actual transfer length is data length + protection
745 * length
746 **/
747 if (protect)
748 cmd->data_length = sectors * dev->dev_attrib.block_size;
749
750 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
751 "prot_op=%d prot_checks=%d\n",
752 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
753 cmd->prot_op, cmd->prot_checks);
754
755 return TCM_NO_SENSE;
756 }
757
758 static int
759 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
760 {
761 if (cdb[1] & 0x10) {
762 /* see explanation in spc_emulate_modesense */
763 if (!target_check_fua(dev)) {
764 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
765 " does not advertise support for DPO\n", cdb[0]);
766 return -EINVAL;
767 }
768 }
769 if (cdb[1] & 0x8) {
770 if (!target_check_fua(dev)) {
771 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
772 " does not advertise support for FUA write\n",
773 cdb[0]);
774 return -EINVAL;
775 }
776 cmd->se_cmd_flags |= SCF_FUA;
777 }
778 return 0;
779 }
780
781 sense_reason_t
782 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
783 {
784 struct se_device *dev = cmd->se_dev;
785 unsigned char *cdb = cmd->t_task_cdb;
786 unsigned int size;
787 u32 sectors = 0;
788 sense_reason_t ret;
789
790 cmd->protocol_data = ops;
791
792 switch (cdb[0]) {
793 case READ_6:
794 sectors = transport_get_sectors_6(cdb);
795 cmd->t_task_lba = transport_lba_21(cdb);
796 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
797 cmd->execute_cmd = sbc_execute_rw;
798 break;
799 case READ_10:
800 sectors = transport_get_sectors_10(cdb);
801 cmd->t_task_lba = transport_lba_32(cdb);
802
803 if (sbc_check_dpofua(dev, cmd, cdb))
804 return TCM_INVALID_CDB_FIELD;
805
806 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
807 if (ret)
808 return ret;
809
810 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
811 cmd->execute_cmd = sbc_execute_rw;
812 break;
813 case READ_12:
814 sectors = transport_get_sectors_12(cdb);
815 cmd->t_task_lba = transport_lba_32(cdb);
816
817 if (sbc_check_dpofua(dev, cmd, cdb))
818 return TCM_INVALID_CDB_FIELD;
819
820 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
821 if (ret)
822 return ret;
823
824 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
825 cmd->execute_cmd = sbc_execute_rw;
826 break;
827 case READ_16:
828 sectors = transport_get_sectors_16(cdb);
829 cmd->t_task_lba = transport_lba_64(cdb);
830
831 if (sbc_check_dpofua(dev, cmd, cdb))
832 return TCM_INVALID_CDB_FIELD;
833
834 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
835 if (ret)
836 return ret;
837
838 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
839 cmd->execute_cmd = sbc_execute_rw;
840 break;
841 case WRITE_6:
842 sectors = transport_get_sectors_6(cdb);
843 cmd->t_task_lba = transport_lba_21(cdb);
844 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
845 cmd->execute_cmd = sbc_execute_rw;
846 break;
847 case WRITE_10:
848 case WRITE_VERIFY:
849 sectors = transport_get_sectors_10(cdb);
850 cmd->t_task_lba = transport_lba_32(cdb);
851
852 if (sbc_check_dpofua(dev, cmd, cdb))
853 return TCM_INVALID_CDB_FIELD;
854
855 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
856 if (ret)
857 return ret;
858
859 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
860 cmd->execute_cmd = sbc_execute_rw;
861 break;
862 case WRITE_12:
863 sectors = transport_get_sectors_12(cdb);
864 cmd->t_task_lba = transport_lba_32(cdb);
865
866 if (sbc_check_dpofua(dev, cmd, cdb))
867 return TCM_INVALID_CDB_FIELD;
868
869 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
870 if (ret)
871 return ret;
872
873 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
874 cmd->execute_cmd = sbc_execute_rw;
875 break;
876 case WRITE_16:
877 sectors = transport_get_sectors_16(cdb);
878 cmd->t_task_lba = transport_lba_64(cdb);
879
880 if (sbc_check_dpofua(dev, cmd, cdb))
881 return TCM_INVALID_CDB_FIELD;
882
883 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
884 if (ret)
885 return ret;
886
887 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
888 cmd->execute_cmd = sbc_execute_rw;
889 break;
890 case XDWRITEREAD_10:
891 if (cmd->data_direction != DMA_TO_DEVICE ||
892 !(cmd->se_cmd_flags & SCF_BIDI))
893 return TCM_INVALID_CDB_FIELD;
894 sectors = transport_get_sectors_10(cdb);
895
896 if (sbc_check_dpofua(dev, cmd, cdb))
897 return TCM_INVALID_CDB_FIELD;
898
899 cmd->t_task_lba = transport_lba_32(cdb);
900 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
901
902 /*
903 * Setup BIDI XOR callback to be run after I/O completion.
904 */
905 cmd->execute_cmd = sbc_execute_rw;
906 cmd->transport_complete_callback = &xdreadwrite_callback;
907 break;
908 case VARIABLE_LENGTH_CMD:
909 {
910 u16 service_action = get_unaligned_be16(&cdb[8]);
911 switch (service_action) {
912 case XDWRITEREAD_32:
913 sectors = transport_get_sectors_32(cdb);
914
915 if (sbc_check_dpofua(dev, cmd, cdb))
916 return TCM_INVALID_CDB_FIELD;
917 /*
918 * Use WRITE_32 and READ_32 opcodes for the emulated
919 * XDWRITE_READ_32 logic.
920 */
921 cmd->t_task_lba = transport_lba_64_ext(cdb);
922 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
923
924 /*
925 * Setup BIDI XOR callback to be run during after I/O
926 * completion.
927 */
928 cmd->execute_cmd = sbc_execute_rw;
929 cmd->transport_complete_callback = &xdreadwrite_callback;
930 break;
931 case WRITE_SAME_32:
932 sectors = transport_get_sectors_32(cdb);
933 if (!sectors) {
934 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
935 " supported\n");
936 return TCM_INVALID_CDB_FIELD;
937 }
938
939 size = sbc_get_size(cmd, 1);
940 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
941
942 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
943 if (ret)
944 return ret;
945 break;
946 default:
947 pr_err("VARIABLE_LENGTH_CMD service action"
948 " 0x%04x not supported\n", service_action);
949 return TCM_UNSUPPORTED_SCSI_OPCODE;
950 }
951 break;
952 }
953 case COMPARE_AND_WRITE:
954 sectors = cdb[13];
955 /*
956 * Currently enforce COMPARE_AND_WRITE for a single sector
957 */
958 if (sectors > 1) {
959 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
960 " than 1\n", sectors);
961 return TCM_INVALID_CDB_FIELD;
962 }
963 /*
964 * Double size because we have two buffers, note that
965 * zero is not an error..
966 */
967 size = 2 * sbc_get_size(cmd, sectors);
968 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
969 cmd->t_task_nolb = sectors;
970 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
971 cmd->execute_cmd = sbc_compare_and_write;
972 cmd->transport_complete_callback = compare_and_write_callback;
973 break;
974 case READ_CAPACITY:
975 size = READ_CAP_LEN;
976 cmd->execute_cmd = sbc_emulate_readcapacity;
977 break;
978 case SERVICE_ACTION_IN_16:
979 switch (cmd->t_task_cdb[1] & 0x1f) {
980 case SAI_READ_CAPACITY_16:
981 cmd->execute_cmd = sbc_emulate_readcapacity_16;
982 break;
983 case SAI_REPORT_REFERRALS:
984 cmd->execute_cmd = target_emulate_report_referrals;
985 break;
986 default:
987 pr_err("Unsupported SA: 0x%02x\n",
988 cmd->t_task_cdb[1] & 0x1f);
989 return TCM_INVALID_CDB_FIELD;
990 }
991 size = (cdb[10] << 24) | (cdb[11] << 16) |
992 (cdb[12] << 8) | cdb[13];
993 break;
994 case SYNCHRONIZE_CACHE:
995 case SYNCHRONIZE_CACHE_16:
996 if (cdb[0] == SYNCHRONIZE_CACHE) {
997 sectors = transport_get_sectors_10(cdb);
998 cmd->t_task_lba = transport_lba_32(cdb);
999 } else {
1000 sectors = transport_get_sectors_16(cdb);
1001 cmd->t_task_lba = transport_lba_64(cdb);
1002 }
1003 if (ops->execute_sync_cache) {
1004 cmd->execute_cmd = ops->execute_sync_cache;
1005 goto check_lba;
1006 }
1007 size = 0;
1008 cmd->execute_cmd = sbc_emulate_noop;
1009 break;
1010 case UNMAP:
1011 if (!ops->execute_unmap)
1012 return TCM_UNSUPPORTED_SCSI_OPCODE;
1013
1014 if (!dev->dev_attrib.emulate_tpu) {
1015 pr_err("Got UNMAP, but backend device has"
1016 " emulate_tpu disabled\n");
1017 return TCM_UNSUPPORTED_SCSI_OPCODE;
1018 }
1019 size = get_unaligned_be16(&cdb[7]);
1020 cmd->execute_cmd = sbc_execute_unmap;
1021 break;
1022 case WRITE_SAME_16:
1023 sectors = transport_get_sectors_16(cdb);
1024 if (!sectors) {
1025 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1026 return TCM_INVALID_CDB_FIELD;
1027 }
1028
1029 size = sbc_get_size(cmd, 1);
1030 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1031
1032 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1033 if (ret)
1034 return ret;
1035 break;
1036 case WRITE_SAME:
1037 sectors = transport_get_sectors_10(cdb);
1038 if (!sectors) {
1039 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1040 return TCM_INVALID_CDB_FIELD;
1041 }
1042
1043 size = sbc_get_size(cmd, 1);
1044 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1045
1046 /*
1047 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1048 * of byte 1 bit 3 UNMAP instead of original reserved field
1049 */
1050 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1051 if (ret)
1052 return ret;
1053 break;
1054 case VERIFY:
1055 size = 0;
1056 sectors = transport_get_sectors_10(cdb);
1057 cmd->t_task_lba = transport_lba_32(cdb);
1058 cmd->execute_cmd = sbc_emulate_noop;
1059 goto check_lba;
1060 case REZERO_UNIT:
1061 case SEEK_6:
1062 case SEEK_10:
1063 /*
1064 * There are still clients out there which use these old SCSI-2
1065 * commands. This mainly happens when running VMs with legacy
1066 * guest systems, connected via SCSI command pass-through to
1067 * iSCSI targets. Make them happy and return status GOOD.
1068 */
1069 size = 0;
1070 cmd->execute_cmd = sbc_emulate_noop;
1071 break;
1072 default:
1073 ret = spc_parse_cdb(cmd, &size);
1074 if (ret)
1075 return ret;
1076 }
1077
1078 /* reject any command that we don't have a handler for */
1079 if (!cmd->execute_cmd)
1080 return TCM_UNSUPPORTED_SCSI_OPCODE;
1081
1082 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1083 unsigned long long end_lba;
1084 check_lba:
1085 end_lba = dev->transport->get_blocks(dev) + 1;
1086 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1087 ((cmd->t_task_lba + sectors) > end_lba)) {
1088 pr_err("cmd exceeds last lba %llu "
1089 "(lba %llu, sectors %u)\n",
1090 end_lba, cmd->t_task_lba, sectors);
1091 return TCM_ADDRESS_OUT_OF_RANGE;
1092 }
1093
1094 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1095 size = sbc_get_size(cmd, sectors);
1096 }
1097
1098 return target_cmd_size_check(cmd, size);
1099 }
1100 EXPORT_SYMBOL(sbc_parse_cdb);
1101
1102 u32 sbc_get_device_type(struct se_device *dev)
1103 {
1104 return TYPE_DISK;
1105 }
1106 EXPORT_SYMBOL(sbc_get_device_type);
1107
1108 static sense_reason_t
1109 sbc_execute_unmap(struct se_cmd *cmd)
1110 {
1111 struct sbc_ops *ops = cmd->protocol_data;
1112 struct se_device *dev = cmd->se_dev;
1113 unsigned char *buf, *ptr = NULL;
1114 sector_t lba;
1115 int size;
1116 u32 range;
1117 sense_reason_t ret = 0;
1118 int dl, bd_dl;
1119
1120 /* We never set ANC_SUP */
1121 if (cmd->t_task_cdb[1])
1122 return TCM_INVALID_CDB_FIELD;
1123
1124 if (cmd->data_length == 0) {
1125 target_complete_cmd(cmd, SAM_STAT_GOOD);
1126 return 0;
1127 }
1128
1129 if (cmd->data_length < 8) {
1130 pr_warn("UNMAP parameter list length %u too small\n",
1131 cmd->data_length);
1132 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1133 }
1134
1135 buf = transport_kmap_data_sg(cmd);
1136 if (!buf)
1137 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1138
1139 dl = get_unaligned_be16(&buf[0]);
1140 bd_dl = get_unaligned_be16(&buf[2]);
1141
1142 size = cmd->data_length - 8;
1143 if (bd_dl > size)
1144 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1145 cmd->data_length, bd_dl);
1146 else
1147 size = bd_dl;
1148
1149 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1150 ret = TCM_INVALID_PARAMETER_LIST;
1151 goto err;
1152 }
1153
1154 /* First UNMAP block descriptor starts at 8 byte offset */
1155 ptr = &buf[8];
1156 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1157 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1158
1159 while (size >= 16) {
1160 lba = get_unaligned_be64(&ptr[0]);
1161 range = get_unaligned_be32(&ptr[8]);
1162 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1163 (unsigned long long)lba, range);
1164
1165 if (range > dev->dev_attrib.max_unmap_lba_count) {
1166 ret = TCM_INVALID_PARAMETER_LIST;
1167 goto err;
1168 }
1169
1170 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1171 ret = TCM_ADDRESS_OUT_OF_RANGE;
1172 goto err;
1173 }
1174
1175 ret = ops->execute_unmap(cmd, lba, range);
1176 if (ret)
1177 goto err;
1178
1179 ptr += 16;
1180 size -= 16;
1181 }
1182
1183 err:
1184 transport_kunmap_data_sg(cmd);
1185 if (!ret)
1186 target_complete_cmd(cmd, GOOD);
1187 return ret;
1188 }
1189
1190 void
1191 sbc_dif_generate(struct se_cmd *cmd)
1192 {
1193 struct se_device *dev = cmd->se_dev;
1194 struct se_dif_v1_tuple *sdt;
1195 struct scatterlist *dsg = cmd->t_data_sg, *psg;
1196 sector_t sector = cmd->t_task_lba;
1197 void *daddr, *paddr;
1198 int i, j, offset = 0;
1199 unsigned int block_size = dev->dev_attrib.block_size;
1200
1201 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1202 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1203 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1204
1205 for (j = 0; j < psg->length;
1206 j += sizeof(struct se_dif_v1_tuple)) {
1207 __u16 crc;
1208 unsigned int avail;
1209
1210 if (offset >= dsg->length) {
1211 offset -= dsg->length;
1212 kunmap_atomic(daddr - dsg->offset);
1213 dsg = sg_next(dsg);
1214 if (!dsg) {
1215 kunmap_atomic(paddr - psg->offset);
1216 return;
1217 }
1218 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1219 }
1220
1221 sdt = paddr + j;
1222 avail = min(block_size, dsg->length - offset);
1223 crc = crc_t10dif(daddr + offset, avail);
1224 if (avail < block_size) {
1225 kunmap_atomic(daddr - dsg->offset);
1226 dsg = sg_next(dsg);
1227 if (!dsg) {
1228 kunmap_atomic(paddr - psg->offset);
1229 return;
1230 }
1231 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1232 offset = block_size - avail;
1233 crc = crc_t10dif_update(crc, daddr, offset);
1234 } else {
1235 offset += block_size;
1236 }
1237
1238 sdt->guard_tag = cpu_to_be16(crc);
1239 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1240 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1241 sdt->app_tag = 0;
1242
1243 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1244 " app_tag: 0x%04x ref_tag: %u\n",
1245 (cmd->data_direction == DMA_TO_DEVICE) ?
1246 "WRITE" : "READ", (unsigned long long)sector,
1247 sdt->guard_tag, sdt->app_tag,
1248 be32_to_cpu(sdt->ref_tag));
1249
1250 sector++;
1251 }
1252
1253 kunmap_atomic(daddr - dsg->offset);
1254 kunmap_atomic(paddr - psg->offset);
1255 }
1256 }
1257
1258 static sense_reason_t
1259 sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt,
1260 __u16 crc, sector_t sector, unsigned int ei_lba)
1261 {
1262 __be16 csum;
1263
1264 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1265 goto check_ref;
1266
1267 csum = cpu_to_be16(crc);
1268
1269 if (sdt->guard_tag != csum) {
1270 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1271 " csum 0x%04x\n", (unsigned long long)sector,
1272 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1273 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1274 }
1275
1276 check_ref:
1277 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1278 return 0;
1279
1280 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1281 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1282 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1283 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1284 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1285 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1286 }
1287
1288 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1289 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1290 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1291 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1292 be32_to_cpu(sdt->ref_tag), ei_lba);
1293 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1294 }
1295
1296 return 0;
1297 }
1298
1299 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1300 struct scatterlist *sg, int sg_off)
1301 {
1302 struct se_device *dev = cmd->se_dev;
1303 struct scatterlist *psg;
1304 void *paddr, *addr;
1305 unsigned int i, len, left;
1306 unsigned int offset = sg_off;
1307
1308 if (!sg)
1309 return;
1310
1311 left = sectors * dev->prot_length;
1312
1313 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1314 unsigned int psg_len, copied = 0;
1315
1316 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1317 psg_len = min(left, psg->length);
1318 while (psg_len) {
1319 len = min(psg_len, sg->length - offset);
1320 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1321
1322 if (read)
1323 memcpy(paddr + copied, addr, len);
1324 else
1325 memcpy(addr, paddr + copied, len);
1326
1327 left -= len;
1328 offset += len;
1329 copied += len;
1330 psg_len -= len;
1331
1332 kunmap_atomic(addr - sg->offset - offset);
1333
1334 if (offset >= sg->length) {
1335 sg = sg_next(sg);
1336 offset = 0;
1337 }
1338 }
1339 kunmap_atomic(paddr - psg->offset);
1340 }
1341 }
1342 EXPORT_SYMBOL(sbc_dif_copy_prot);
1343
1344 sense_reason_t
1345 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1346 unsigned int ei_lba, struct scatterlist *psg, int psg_off)
1347 {
1348 struct se_device *dev = cmd->se_dev;
1349 struct se_dif_v1_tuple *sdt;
1350 struct scatterlist *dsg = cmd->t_data_sg;
1351 sector_t sector = start;
1352 void *daddr, *paddr;
1353 int i;
1354 sense_reason_t rc;
1355 int dsg_off = 0;
1356 unsigned int block_size = dev->dev_attrib.block_size;
1357
1358 for (; psg && sector < start + sectors; psg = sg_next(psg)) {
1359 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1360 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1361
1362 for (i = psg_off; i < psg->length &&
1363 sector < start + sectors;
1364 i += sizeof(struct se_dif_v1_tuple)) {
1365 __u16 crc;
1366 unsigned int avail;
1367
1368 if (dsg_off >= dsg->length) {
1369 dsg_off -= dsg->length;
1370 kunmap_atomic(daddr - dsg->offset);
1371 dsg = sg_next(dsg);
1372 if (!dsg) {
1373 kunmap_atomic(paddr - psg->offset);
1374 return 0;
1375 }
1376 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1377 }
1378
1379 sdt = paddr + i;
1380
1381 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1382 " app_tag: 0x%04x ref_tag: %u\n",
1383 (unsigned long long)sector, sdt->guard_tag,
1384 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1385
1386 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1387 dsg_off += block_size;
1388 goto next;
1389 }
1390
1391 avail = min(block_size, dsg->length - dsg_off);
1392 crc = crc_t10dif(daddr + dsg_off, avail);
1393 if (avail < block_size) {
1394 kunmap_atomic(daddr - dsg->offset);
1395 dsg = sg_next(dsg);
1396 if (!dsg) {
1397 kunmap_atomic(paddr - psg->offset);
1398 return 0;
1399 }
1400 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1401 dsg_off = block_size - avail;
1402 crc = crc_t10dif_update(crc, daddr, dsg_off);
1403 } else {
1404 dsg_off += block_size;
1405 }
1406
1407 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
1408 if (rc) {
1409 kunmap_atomic(daddr - dsg->offset);
1410 kunmap_atomic(paddr - psg->offset);
1411 cmd->bad_sector = sector;
1412 return rc;
1413 }
1414 next:
1415 sector++;
1416 ei_lba++;
1417 }
1418
1419 psg_off = 0;
1420 kunmap_atomic(daddr - dsg->offset);
1421 kunmap_atomic(paddr - psg->offset);
1422 }
1423
1424 return 0;
1425 }
1426 EXPORT_SYMBOL(sbc_dif_verify);
Linux kernel - Deliverables
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