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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * SCSI Block Commands (SBC) parsing and emulation.
4 *
5 * (c) Copyright 2002-2013 Datera, Inc.
6 *
7 * Nicholas A. Bellinger <nab@kernel.org>
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/ratelimit.h>
13#include <linux/crc-t10dif.h>
14#include <linux/t10-pi.h>
15#include <asm/unaligned.h>
16#include <scsi/scsi_proto.h>
17#include <scsi/scsi_tcq.h>
18
19#include <target/target_core_base.h>
20#include <target/target_core_backend.h>
21#include <target/target_core_fabric.h>
22
23#include "target_core_internal.h"
24#include "target_core_ua.h"
25#include "target_core_alua.h"
26
27static sense_reason_t
28sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char, u32, bool);
29static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd);
30
31static sense_reason_t
32sbc_emulate_readcapacity(struct se_cmd *cmd)
33{
34 struct se_device *dev = cmd->se_dev;
35 unsigned char *cdb = cmd->t_task_cdb;
36 unsigned long long blocks_long = dev->transport->get_blocks(dev);
37 unsigned char *rbuf;
38 unsigned char buf[8];
39 u32 blocks;
40
41 /*
42 * SBC-2 says:
43 * If the PMI bit is set to zero and the LOGICAL BLOCK
44 * ADDRESS field is not set to zero, the device server shall
45 * terminate the command with CHECK CONDITION status with
46 * the sense key set to ILLEGAL REQUEST and the additional
47 * sense code set to INVALID FIELD IN CDB.
48 *
49 * In SBC-3, these fields are obsolete, but some SCSI
50 * compliance tests actually check this, so we might as well
51 * follow SBC-2.
52 */
53 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
54 return TCM_INVALID_CDB_FIELD;
55
56 if (blocks_long >= 0x00000000ffffffff)
57 blocks = 0xffffffff;
58 else
59 blocks = (u32)blocks_long;
60
61 put_unaligned_be32(blocks, &buf[0]);
62 put_unaligned_be32(dev->dev_attrib.block_size, &buf[4]);
63
64 rbuf = transport_kmap_data_sg(cmd);
65 if (rbuf) {
66 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
67 transport_kunmap_data_sg(cmd);
68 }
69
70 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8);
71 return 0;
72}
73
74static sense_reason_t
75sbc_emulate_readcapacity_16(struct se_cmd *cmd)
76{
77 struct se_device *dev = cmd->se_dev;
78 struct se_session *sess = cmd->se_sess;
79 int pi_prot_type = dev->dev_attrib.pi_prot_type;
80
81 unsigned char *rbuf;
82 unsigned char buf[32];
83 unsigned long long blocks = dev->transport->get_blocks(dev);
84
85 memset(buf, 0, sizeof(buf));
86 put_unaligned_be64(blocks, &buf[0]);
87 put_unaligned_be32(dev->dev_attrib.block_size, &buf[8]);
88 /*
89 * Set P_TYPE and PROT_EN bits for DIF support
90 */
91 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
92 /*
93 * Only override a device's pi_prot_type if no T10-PI is
94 * available, and sess_prot_type has been explicitly enabled.
95 */
96 if (!pi_prot_type)
97 pi_prot_type = sess->sess_prot_type;
98
99 if (pi_prot_type)
100 buf[12] = (pi_prot_type - 1) << 1 | 0x1;
101 }
102
103 if (dev->transport->get_lbppbe)
104 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
105
106 if (dev->transport->get_alignment_offset_lbas) {
107 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
108
109 put_unaligned_be16(lalba, &buf[14]);
110 }
111
112 /*
113 * Set Thin Provisioning Enable bit following sbc3r22 in section
114 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
115 */
116 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) {
117 buf[14] |= 0x80;
118
119 /*
120 * LBPRZ signifies that zeroes will be read back from an LBA after
121 * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2)
122 */
123 if (dev->dev_attrib.unmap_zeroes_data)
124 buf[14] |= 0x40;
125 }
126
127 rbuf = transport_kmap_data_sg(cmd);
128 if (rbuf) {
129 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
130 transport_kunmap_data_sg(cmd);
131 }
132
133 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 32);
134 return 0;
135}
136
137static sense_reason_t
138sbc_emulate_startstop(struct se_cmd *cmd)
139{
140 unsigned char *cdb = cmd->t_task_cdb;
141
142 /*
143 * See sbc3r36 section 5.25
144 * Immediate bit should be set since there is nothing to complete
145 * POWER CONDITION MODIFIER 0h
146 */
147 if (!(cdb[1] & 1) || cdb[2] || cdb[3])
148 return TCM_INVALID_CDB_FIELD;
149
150 /*
151 * See sbc3r36 section 5.25
152 * POWER CONDITION 0h START_VALID - process START and LOEJ
153 */
154 if (cdb[4] >> 4 & 0xf)
155 return TCM_INVALID_CDB_FIELD;
156
157 /*
158 * See sbc3r36 section 5.25
159 * LOEJ 0h - nothing to load or unload
160 * START 1h - we are ready
161 */
162 if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4))
163 return TCM_INVALID_CDB_FIELD;
164
165 target_complete_cmd(cmd, SAM_STAT_GOOD);
166 return 0;
167}
168
169sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
170{
171 u32 num_blocks;
172
173 if (cmd->t_task_cdb[0] == WRITE_SAME)
174 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
175 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
176 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
177 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
178 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
179
180 /*
181 * Use the explicit range when non zero is supplied, otherwise calculate
182 * the remaining range based on ->get_blocks() - starting LBA.
183 */
184 if (num_blocks)
185 return num_blocks;
186
187 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
188 cmd->t_task_lba + 1;
189}
190EXPORT_SYMBOL(sbc_get_write_same_sectors);
191
192static sense_reason_t
193sbc_execute_write_same_unmap(struct se_cmd *cmd)
194{
195 struct sbc_ops *ops = cmd->protocol_data;
196 sector_t nolb = sbc_get_write_same_sectors(cmd);
197 sense_reason_t ret;
198
199 if (nolb) {
200 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb);
201 if (ret)
202 return ret;
203 }
204
205 target_complete_cmd(cmd, SAM_STAT_GOOD);
206 return 0;
207}
208
209static sense_reason_t
210sbc_emulate_noop(struct se_cmd *cmd)
211{
212 target_complete_cmd(cmd, SAM_STAT_GOOD);
213 return 0;
214}
215
216static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
217{
218 return cmd->se_dev->dev_attrib.block_size * sectors;
219}
220
221static inline u32 transport_get_sectors_6(unsigned char *cdb)
222{
223 /*
224 * Use 8-bit sector value. SBC-3 says:
225 *
226 * A TRANSFER LENGTH field set to zero specifies that 256
227 * logical blocks shall be written. Any other value
228 * specifies the number of logical blocks that shall be
229 * written.
230 */
231 return cdb[4] ? : 256;
232}
233
234static inline u32 transport_get_sectors_10(unsigned char *cdb)
235{
236 return get_unaligned_be16(&cdb[7]);
237}
238
239static inline u32 transport_get_sectors_12(unsigned char *cdb)
240{
241 return get_unaligned_be32(&cdb[6]);
242}
243
244static inline u32 transport_get_sectors_16(unsigned char *cdb)
245{
246 return get_unaligned_be32(&cdb[10]);
247}
248
249/*
250 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
251 */
252static inline u32 transport_get_sectors_32(unsigned char *cdb)
253{
254 return get_unaligned_be32(&cdb[28]);
255
256}
257
258static inline u32 transport_lba_21(unsigned char *cdb)
259{
260 return get_unaligned_be24(&cdb[1]) & 0x1fffff;
261}
262
263static inline u32 transport_lba_32(unsigned char *cdb)
264{
265 return get_unaligned_be32(&cdb[2]);
266}
267
268static inline unsigned long long transport_lba_64(unsigned char *cdb)
269{
270 return get_unaligned_be64(&cdb[2]);
271}
272
273/*
274 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
275 */
276static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
277{
278 return get_unaligned_be64(&cdb[12]);
279}
280
281static sense_reason_t
282sbc_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 & 0x04) || (flags & 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 & 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 & 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, flags >> 5, sectors, true);
335 if (ret)
336 return ret;
337
338 cmd->execute_cmd = ops->execute_write_same;
339 return 0;
340}
341
342static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success,
343 int *post_ret)
344{
345 unsigned char *buf, *addr;
346 struct scatterlist *sg;
347 unsigned int offset;
348 sense_reason_t ret = TCM_NO_SENSE;
349 int i, count;
350
351 if (!success)
352 return 0;
353
354 /*
355 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
356 *
357 * 1) read the specified logical block(s);
358 * 2) transfer logical blocks from the data-out buffer;
359 * 3) XOR the logical blocks transferred from the data-out buffer with
360 * the logical blocks read, storing the resulting XOR data in a buffer;
361 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
362 * blocks transferred from the data-out buffer; and
363 * 5) transfer the resulting XOR data to the data-in buffer.
364 */
365 buf = kmalloc(cmd->data_length, GFP_KERNEL);
366 if (!buf) {
367 pr_err("Unable to allocate xor_callback buf\n");
368 return TCM_OUT_OF_RESOURCES;
369 }
370 /*
371 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
372 * into the locally allocated *buf
373 */
374 sg_copy_to_buffer(cmd->t_data_sg,
375 cmd->t_data_nents,
376 buf,
377 cmd->data_length);
378
379 /*
380 * Now perform the XOR against the BIDI read memory located at
381 * cmd->t_mem_bidi_list
382 */
383
384 offset = 0;
385 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
386 addr = kmap_atomic(sg_page(sg));
387 if (!addr) {
388 ret = TCM_OUT_OF_RESOURCES;
389 goto out;
390 }
391
392 for (i = 0; i < sg->length; i++)
393 *(addr + sg->offset + i) ^= *(buf + offset + i);
394
395 offset += sg->length;
396 kunmap_atomic(addr);
397 }
398
399out:
400 kfree(buf);
401 return ret;
402}
403
404static sense_reason_t
405sbc_execute_rw(struct se_cmd *cmd)
406{
407 struct sbc_ops *ops = cmd->protocol_data;
408
409 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
410 cmd->data_direction);
411}
412
413static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success,
414 int *post_ret)
415{
416 struct se_device *dev = cmd->se_dev;
417 sense_reason_t ret = TCM_NO_SENSE;
418
419 spin_lock_irq(&cmd->t_state_lock);
420 if (success) {
421 *post_ret = 1;
422
423 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
424 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
425 }
426 spin_unlock_irq(&cmd->t_state_lock);
427
428 /*
429 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
430 * before the original READ I/O submission.
431 */
432 up(&dev->caw_sem);
433
434 return ret;
435}
436
437/*
438 * compare @cmp_len bytes of @read_sgl with @cmp_sgl. On miscompare, fill
439 * @miscmp_off and return TCM_MISCOMPARE_VERIFY.
440 */
441static sense_reason_t
442compare_and_write_do_cmp(struct scatterlist *read_sgl, unsigned int read_nents,
443 struct scatterlist *cmp_sgl, unsigned int cmp_nents,
444 unsigned int cmp_len, unsigned int *miscmp_off)
445{
446 unsigned char *buf = NULL;
447 struct scatterlist *sg;
448 sense_reason_t ret;
449 unsigned int offset;
450 size_t rc;
451 int sg_cnt;
452
453 buf = kzalloc(cmp_len, GFP_KERNEL);
454 if (!buf) {
455 ret = TCM_OUT_OF_RESOURCES;
456 goto out;
457 }
458
459 rc = sg_copy_to_buffer(cmp_sgl, cmp_nents, buf, cmp_len);
460 if (!rc) {
461 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
462 ret = TCM_OUT_OF_RESOURCES;
463 goto out;
464 }
465 /*
466 * Compare SCSI READ payload against verify payload
467 */
468 offset = 0;
469 ret = TCM_NO_SENSE;
470 for_each_sg(read_sgl, sg, read_nents, sg_cnt) {
471 unsigned int len = min(sg->length, cmp_len);
472 unsigned char *addr = kmap_atomic(sg_page(sg));
473
474 if (memcmp(addr, buf + offset, len)) {
475 unsigned int i;
476
477 for (i = 0; i < len && addr[i] == buf[offset + i]; i++)
478 ;
479 *miscmp_off = offset + i;
480 pr_warn("Detected MISCOMPARE at offset %u\n",
481 *miscmp_off);
482 ret = TCM_MISCOMPARE_VERIFY;
483 }
484 kunmap_atomic(addr);
485 if (ret != TCM_NO_SENSE)
486 goto out;
487
488 offset += len;
489 cmp_len -= len;
490 if (!cmp_len)
491 break;
492 }
493 pr_debug("COMPARE AND WRITE read data matches compare data\n");
494out:
495 kfree(buf);
496 return ret;
497}
498
499static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
500 int *post_ret)
501{
502 struct se_device *dev = cmd->se_dev;
503 struct sg_table write_tbl = { };
504 struct scatterlist *write_sg;
505 struct sg_mapping_iter m;
506 unsigned int len;
507 unsigned int block_size = dev->dev_attrib.block_size;
508 unsigned int compare_len = (cmd->t_task_nolb * block_size);
509 unsigned int miscmp_off = 0;
510 sense_reason_t ret = TCM_NO_SENSE;
511 int i;
512
513 /*
514 * Handle early failure in transport_generic_request_failure(),
515 * which will not have taken ->caw_sem yet..
516 */
517 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
518 return TCM_NO_SENSE;
519 /*
520 * Handle special case for zero-length COMPARE_AND_WRITE
521 */
522 if (!cmd->data_length)
523 goto out;
524 /*
525 * Immediately exit + release dev->caw_sem if command has already
526 * been failed with a non-zero SCSI status.
527 */
528 if (cmd->scsi_status) {
529 pr_debug("compare_and_write_callback: non zero scsi_status:"
530 " 0x%02x\n", cmd->scsi_status);
531 *post_ret = 1;
532 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
533 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
534 goto out;
535 }
536
537 ret = compare_and_write_do_cmp(cmd->t_bidi_data_sg,
538 cmd->t_bidi_data_nents,
539 cmd->t_data_sg,
540 cmd->t_data_nents,
541 compare_len,
542 &miscmp_off);
543 if (ret == TCM_MISCOMPARE_VERIFY) {
544 /*
545 * SBC-4 r15: 5.3 COMPARE AND WRITE command
546 * In the sense data (see 4.18 and SPC-5) the offset from the
547 * start of the Data-Out Buffer to the first byte of data that
548 * was not equal shall be reported in the INFORMATION field.
549 */
550 cmd->sense_info = miscmp_off;
551 goto out;
552 } else if (ret)
553 goto out;
554
555 if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) {
556 pr_err("Unable to allocate compare_and_write sg\n");
557 ret = TCM_OUT_OF_RESOURCES;
558 goto out;
559 }
560 write_sg = write_tbl.sgl;
561
562 i = 0;
563 len = compare_len;
564 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
565 /*
566 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
567 */
568 while (len) {
569 sg_miter_next(&m);
570
571 if (block_size < PAGE_SIZE) {
572 sg_set_page(&write_sg[i], m.page, block_size,
573 m.piter.sg->offset + block_size);
574 } else {
575 sg_miter_next(&m);
576 sg_set_page(&write_sg[i], m.page, block_size,
577 m.piter.sg->offset);
578 }
579 len -= block_size;
580 i++;
581 }
582 sg_miter_stop(&m);
583 /*
584 * Save the original SGL + nents values before updating to new
585 * assignments, to be released in transport_free_pages() ->
586 * transport_reset_sgl_orig()
587 */
588 cmd->t_data_sg_orig = cmd->t_data_sg;
589 cmd->t_data_sg = write_sg;
590 cmd->t_data_nents_orig = cmd->t_data_nents;
591 cmd->t_data_nents = 1;
592
593 cmd->sam_task_attr = TCM_HEAD_TAG;
594 cmd->transport_complete_callback = compare_and_write_post;
595 /*
596 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
597 * for submitting the adjusted SGL to write instance user-data.
598 */
599 cmd->execute_cmd = sbc_execute_rw;
600
601 spin_lock_irq(&cmd->t_state_lock);
602 cmd->t_state = TRANSPORT_PROCESSING;
603 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
604 spin_unlock_irq(&cmd->t_state_lock);
605
606 __target_execute_cmd(cmd, false);
607
608 return ret;
609
610out:
611 /*
612 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
613 * sbc_compare_and_write() before the original READ I/O submission.
614 */
615 up(&dev->caw_sem);
616 sg_free_table(&write_tbl);
617 return ret;
618}
619
620static sense_reason_t
621sbc_compare_and_write(struct se_cmd *cmd)
622{
623 struct sbc_ops *ops = cmd->protocol_data;
624 struct se_device *dev = cmd->se_dev;
625 sense_reason_t ret;
626 int rc;
627 /*
628 * Submit the READ first for COMPARE_AND_WRITE to perform the
629 * comparision using SGLs at cmd->t_bidi_data_sg..
630 */
631 rc = down_interruptible(&dev->caw_sem);
632 if (rc != 0) {
633 cmd->transport_complete_callback = NULL;
634 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
635 }
636 /*
637 * Reset cmd->data_length to individual block_size in order to not
638 * confuse backend drivers that depend on this value matching the
639 * size of the I/O being submitted.
640 */
641 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
642
643 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
644 DMA_FROM_DEVICE);
645 if (ret) {
646 cmd->transport_complete_callback = NULL;
647 up(&dev->caw_sem);
648 return ret;
649 }
650 /*
651 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
652 * upon MISCOMPARE, or in compare_and_write_done() upon completion
653 * of WRITE instance user-data.
654 */
655 return TCM_NO_SENSE;
656}
657
658static int
659sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
660 bool is_write, struct se_cmd *cmd)
661{
662 if (is_write) {
663 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
664 protect ? TARGET_PROT_DOUT_PASS :
665 TARGET_PROT_DOUT_INSERT;
666 switch (protect) {
667 case 0x0:
668 case 0x3:
669 cmd->prot_checks = 0;
670 break;
671 case 0x1:
672 case 0x5:
673 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
674 if (prot_type == TARGET_DIF_TYPE1_PROT)
675 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
676 break;
677 case 0x2:
678 if (prot_type == TARGET_DIF_TYPE1_PROT)
679 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
680 break;
681 case 0x4:
682 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
683 break;
684 default:
685 pr_err("Unsupported protect field %d\n", protect);
686 return -EINVAL;
687 }
688 } else {
689 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
690 protect ? TARGET_PROT_DIN_PASS :
691 TARGET_PROT_DIN_STRIP;
692 switch (protect) {
693 case 0x0:
694 case 0x1:
695 case 0x5:
696 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
697 if (prot_type == TARGET_DIF_TYPE1_PROT)
698 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
699 break;
700 case 0x2:
701 if (prot_type == TARGET_DIF_TYPE1_PROT)
702 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
703 break;
704 case 0x3:
705 cmd->prot_checks = 0;
706 break;
707 case 0x4:
708 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
709 break;
710 default:
711 pr_err("Unsupported protect field %d\n", protect);
712 return -EINVAL;
713 }
714 }
715
716 return 0;
717}
718
719static sense_reason_t
720sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char protect,
721 u32 sectors, bool is_write)
722{
723 int sp_ops = cmd->se_sess->sup_prot_ops;
724 int pi_prot_type = dev->dev_attrib.pi_prot_type;
725 bool fabric_prot = false;
726
727 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
728 if (unlikely(protect &&
729 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
730 pr_err("CDB contains protect bit, but device + fabric does"
731 " not advertise PROTECT=1 feature bit\n");
732 return TCM_INVALID_CDB_FIELD;
733 }
734 if (cmd->prot_pto)
735 return TCM_NO_SENSE;
736 }
737
738 switch (dev->dev_attrib.pi_prot_type) {
739 case TARGET_DIF_TYPE3_PROT:
740 cmd->reftag_seed = 0xffffffff;
741 break;
742 case TARGET_DIF_TYPE2_PROT:
743 if (protect)
744 return TCM_INVALID_CDB_FIELD;
745
746 cmd->reftag_seed = cmd->t_task_lba;
747 break;
748 case TARGET_DIF_TYPE1_PROT:
749 cmd->reftag_seed = cmd->t_task_lba;
750 break;
751 case TARGET_DIF_TYPE0_PROT:
752 /*
753 * See if the fabric supports T10-PI, and the session has been
754 * configured to allow export PROTECT=1 feature bit with backend
755 * devices that don't support T10-PI.
756 */
757 fabric_prot = is_write ?
758 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
759 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
760
761 if (fabric_prot && cmd->se_sess->sess_prot_type) {
762 pi_prot_type = cmd->se_sess->sess_prot_type;
763 break;
764 }
765 if (!protect)
766 return TCM_NO_SENSE;
767 fallthrough;
768 default:
769 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
770 "PROTECT: 0x%02x\n", cmd->t_task_cdb[0], protect);
771 return TCM_INVALID_CDB_FIELD;
772 }
773
774 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
775 return TCM_INVALID_CDB_FIELD;
776
777 cmd->prot_type = pi_prot_type;
778 cmd->prot_length = dev->prot_length * sectors;
779
780 /**
781 * In case protection information exists over the wire
782 * we modify command data length to describe pure data.
783 * The actual transfer length is data length + protection
784 * length
785 **/
786 if (protect)
787 cmd->data_length = sectors * dev->dev_attrib.block_size;
788
789 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
790 "prot_op=%d prot_checks=%d\n",
791 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
792 cmd->prot_op, cmd->prot_checks);
793
794 return TCM_NO_SENSE;
795}
796
797static int
798sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
799{
800 if (cdb[1] & 0x10) {
801 /* see explanation in spc_emulate_modesense */
802 if (!target_check_fua(dev)) {
803 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
804 " does not advertise support for DPO\n", cdb[0]);
805 return -EINVAL;
806 }
807 }
808 if (cdb[1] & 0x8) {
809 if (!target_check_fua(dev)) {
810 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
811 " does not advertise support for FUA write\n",
812 cdb[0]);
813 return -EINVAL;
814 }
815 cmd->se_cmd_flags |= SCF_FUA;
816 }
817 return 0;
818}
819
820sense_reason_t
821sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
822{
823 struct se_device *dev = cmd->se_dev;
824 unsigned char *cdb = cmd->t_task_cdb;
825 unsigned int size;
826 u32 sectors = 0;
827 sense_reason_t ret;
828
829 cmd->protocol_data = ops;
830
831 switch (cdb[0]) {
832 case READ_6:
833 sectors = transport_get_sectors_6(cdb);
834 cmd->t_task_lba = transport_lba_21(cdb);
835 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
836 cmd->execute_cmd = sbc_execute_rw;
837 break;
838 case READ_10:
839 sectors = transport_get_sectors_10(cdb);
840 cmd->t_task_lba = transport_lba_32(cdb);
841
842 if (sbc_check_dpofua(dev, cmd, cdb))
843 return TCM_INVALID_CDB_FIELD;
844
845 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
846 if (ret)
847 return ret;
848
849 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
850 cmd->execute_cmd = sbc_execute_rw;
851 break;
852 case READ_12:
853 sectors = transport_get_sectors_12(cdb);
854 cmd->t_task_lba = transport_lba_32(cdb);
855
856 if (sbc_check_dpofua(dev, cmd, cdb))
857 return TCM_INVALID_CDB_FIELD;
858
859 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
860 if (ret)
861 return ret;
862
863 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
864 cmd->execute_cmd = sbc_execute_rw;
865 break;
866 case READ_16:
867 sectors = transport_get_sectors_16(cdb);
868 cmd->t_task_lba = transport_lba_64(cdb);
869
870 if (sbc_check_dpofua(dev, cmd, cdb))
871 return TCM_INVALID_CDB_FIELD;
872
873 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
874 if (ret)
875 return ret;
876
877 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
878 cmd->execute_cmd = sbc_execute_rw;
879 break;
880 case WRITE_6:
881 sectors = transport_get_sectors_6(cdb);
882 cmd->t_task_lba = transport_lba_21(cdb);
883 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
884 cmd->execute_cmd = sbc_execute_rw;
885 break;
886 case WRITE_10:
887 case WRITE_VERIFY:
888 sectors = transport_get_sectors_10(cdb);
889 cmd->t_task_lba = transport_lba_32(cdb);
890
891 if (sbc_check_dpofua(dev, cmd, cdb))
892 return TCM_INVALID_CDB_FIELD;
893
894 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
895 if (ret)
896 return ret;
897
898 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
899 cmd->execute_cmd = sbc_execute_rw;
900 break;
901 case WRITE_12:
902 sectors = transport_get_sectors_12(cdb);
903 cmd->t_task_lba = transport_lba_32(cdb);
904
905 if (sbc_check_dpofua(dev, cmd, cdb))
906 return TCM_INVALID_CDB_FIELD;
907
908 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
909 if (ret)
910 return ret;
911
912 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
913 cmd->execute_cmd = sbc_execute_rw;
914 break;
915 case WRITE_16:
916 case WRITE_VERIFY_16:
917 sectors = transport_get_sectors_16(cdb);
918 cmd->t_task_lba = transport_lba_64(cdb);
919
920 if (sbc_check_dpofua(dev, cmd, cdb))
921 return TCM_INVALID_CDB_FIELD;
922
923 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
924 if (ret)
925 return ret;
926
927 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
928 cmd->execute_cmd = sbc_execute_rw;
929 break;
930 case XDWRITEREAD_10:
931 if (cmd->data_direction != DMA_TO_DEVICE ||
932 !(cmd->se_cmd_flags & SCF_BIDI))
933 return TCM_INVALID_CDB_FIELD;
934 sectors = transport_get_sectors_10(cdb);
935
936 if (sbc_check_dpofua(dev, cmd, cdb))
937 return TCM_INVALID_CDB_FIELD;
938
939 cmd->t_task_lba = transport_lba_32(cdb);
940 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
941
942 /*
943 * Setup BIDI XOR callback to be run after I/O completion.
944 */
945 cmd->execute_cmd = sbc_execute_rw;
946 cmd->transport_complete_callback = &xdreadwrite_callback;
947 break;
948 case VARIABLE_LENGTH_CMD:
949 {
950 u16 service_action = get_unaligned_be16(&cdb[8]);
951 switch (service_action) {
952 case XDWRITEREAD_32:
953 sectors = transport_get_sectors_32(cdb);
954
955 if (sbc_check_dpofua(dev, cmd, cdb))
956 return TCM_INVALID_CDB_FIELD;
957 /*
958 * Use WRITE_32 and READ_32 opcodes for the emulated
959 * XDWRITE_READ_32 logic.
960 */
961 cmd->t_task_lba = transport_lba_64_ext(cdb);
962 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
963
964 /*
965 * Setup BIDI XOR callback to be run during after I/O
966 * completion.
967 */
968 cmd->execute_cmd = sbc_execute_rw;
969 cmd->transport_complete_callback = &xdreadwrite_callback;
970 break;
971 case WRITE_SAME_32:
972 sectors = transport_get_sectors_32(cdb);
973 if (!sectors) {
974 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
975 " supported\n");
976 return TCM_INVALID_CDB_FIELD;
977 }
978
979 size = sbc_get_size(cmd, 1);
980 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
981
982 ret = sbc_setup_write_same(cmd, cdb[10], ops);
983 if (ret)
984 return ret;
985 break;
986 default:
987 pr_err("VARIABLE_LENGTH_CMD service action"
988 " 0x%04x not supported\n", service_action);
989 return TCM_UNSUPPORTED_SCSI_OPCODE;
990 }
991 break;
992 }
993 case COMPARE_AND_WRITE:
994 if (!dev->dev_attrib.emulate_caw) {
995 pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject COMPARE_AND_WRITE\n",
996 dev->se_hba->backend->ops->name,
997 config_item_name(&dev->dev_group.cg_item),
998 dev->t10_wwn.unit_serial);
999 return TCM_UNSUPPORTED_SCSI_OPCODE;
1000 }
1001 sectors = cdb[13];
1002 /*
1003 * Currently enforce COMPARE_AND_WRITE for a single sector
1004 */
1005 if (sectors > 1) {
1006 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
1007 " than 1\n", sectors);
1008 return TCM_INVALID_CDB_FIELD;
1009 }
1010 if (sbc_check_dpofua(dev, cmd, cdb))
1011 return TCM_INVALID_CDB_FIELD;
1012
1013 /*
1014 * Double size because we have two buffers, note that
1015 * zero is not an error..
1016 */
1017 size = 2 * sbc_get_size(cmd, sectors);
1018 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1019 cmd->t_task_nolb = sectors;
1020 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
1021 cmd->execute_cmd = sbc_compare_and_write;
1022 cmd->transport_complete_callback = compare_and_write_callback;
1023 break;
1024 case READ_CAPACITY:
1025 size = READ_CAP_LEN;
1026 cmd->execute_cmd = sbc_emulate_readcapacity;
1027 break;
1028 case SERVICE_ACTION_IN_16:
1029 switch (cmd->t_task_cdb[1] & 0x1f) {
1030 case SAI_READ_CAPACITY_16:
1031 cmd->execute_cmd = sbc_emulate_readcapacity_16;
1032 break;
1033 case SAI_REPORT_REFERRALS:
1034 cmd->execute_cmd = target_emulate_report_referrals;
1035 break;
1036 default:
1037 pr_err("Unsupported SA: 0x%02x\n",
1038 cmd->t_task_cdb[1] & 0x1f);
1039 return TCM_INVALID_CDB_FIELD;
1040 }
1041 size = get_unaligned_be32(&cdb[10]);
1042 break;
1043 case SYNCHRONIZE_CACHE:
1044 case SYNCHRONIZE_CACHE_16:
1045 if (cdb[0] == SYNCHRONIZE_CACHE) {
1046 sectors = transport_get_sectors_10(cdb);
1047 cmd->t_task_lba = transport_lba_32(cdb);
1048 } else {
1049 sectors = transport_get_sectors_16(cdb);
1050 cmd->t_task_lba = transport_lba_64(cdb);
1051 }
1052 if (ops->execute_sync_cache) {
1053 cmd->execute_cmd = ops->execute_sync_cache;
1054 goto check_lba;
1055 }
1056 size = 0;
1057 cmd->execute_cmd = sbc_emulate_noop;
1058 break;
1059 case UNMAP:
1060 if (!ops->execute_unmap)
1061 return TCM_UNSUPPORTED_SCSI_OPCODE;
1062
1063 if (!dev->dev_attrib.emulate_tpu) {
1064 pr_err("Got UNMAP, but backend device has"
1065 " emulate_tpu disabled\n");
1066 return TCM_UNSUPPORTED_SCSI_OPCODE;
1067 }
1068 size = get_unaligned_be16(&cdb[7]);
1069 cmd->execute_cmd = sbc_execute_unmap;
1070 break;
1071 case WRITE_SAME_16:
1072 sectors = transport_get_sectors_16(cdb);
1073 if (!sectors) {
1074 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1075 return TCM_INVALID_CDB_FIELD;
1076 }
1077
1078 size = sbc_get_size(cmd, 1);
1079 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1080
1081 ret = sbc_setup_write_same(cmd, cdb[1], ops);
1082 if (ret)
1083 return ret;
1084 break;
1085 case WRITE_SAME:
1086 sectors = transport_get_sectors_10(cdb);
1087 if (!sectors) {
1088 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1089 return TCM_INVALID_CDB_FIELD;
1090 }
1091
1092 size = sbc_get_size(cmd, 1);
1093 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1094
1095 /*
1096 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1097 * of byte 1 bit 3 UNMAP instead of original reserved field
1098 */
1099 ret = sbc_setup_write_same(cmd, cdb[1], ops);
1100 if (ret)
1101 return ret;
1102 break;
1103 case VERIFY:
1104 case VERIFY_16:
1105 size = 0;
1106 if (cdb[0] == VERIFY) {
1107 sectors = transport_get_sectors_10(cdb);
1108 cmd->t_task_lba = transport_lba_32(cdb);
1109 } else {
1110 sectors = transport_get_sectors_16(cdb);
1111 cmd->t_task_lba = transport_lba_64(cdb);
1112 }
1113 cmd->execute_cmd = sbc_emulate_noop;
1114 goto check_lba;
1115 case REZERO_UNIT:
1116 case SEEK_6:
1117 case SEEK_10:
1118 /*
1119 * There are still clients out there which use these old SCSI-2
1120 * commands. This mainly happens when running VMs with legacy
1121 * guest systems, connected via SCSI command pass-through to
1122 * iSCSI targets. Make them happy and return status GOOD.
1123 */
1124 size = 0;
1125 cmd->execute_cmd = sbc_emulate_noop;
1126 break;
1127 case START_STOP:
1128 size = 0;
1129 cmd->execute_cmd = sbc_emulate_startstop;
1130 break;
1131 default:
1132 ret = spc_parse_cdb(cmd, &size);
1133 if (ret)
1134 return ret;
1135 }
1136
1137 /* reject any command that we don't have a handler for */
1138 if (!cmd->execute_cmd)
1139 return TCM_UNSUPPORTED_SCSI_OPCODE;
1140
1141 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1142 unsigned long long end_lba;
1143check_lba:
1144 end_lba = dev->transport->get_blocks(dev) + 1;
1145 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1146 ((cmd->t_task_lba + sectors) > end_lba)) {
1147 pr_err("cmd exceeds last lba %llu "
1148 "(lba %llu, sectors %u)\n",
1149 end_lba, cmd->t_task_lba, sectors);
1150 return TCM_ADDRESS_OUT_OF_RANGE;
1151 }
1152
1153 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1154 size = sbc_get_size(cmd, sectors);
1155 }
1156
1157 return target_cmd_size_check(cmd, size);
1158}
1159EXPORT_SYMBOL(sbc_parse_cdb);
1160
1161u32 sbc_get_device_type(struct se_device *dev)
1162{
1163 return TYPE_DISK;
1164}
1165EXPORT_SYMBOL(sbc_get_device_type);
1166
1167static sense_reason_t
1168sbc_execute_unmap(struct se_cmd *cmd)
1169{
1170 struct sbc_ops *ops = cmd->protocol_data;
1171 struct se_device *dev = cmd->se_dev;
1172 unsigned char *buf, *ptr = NULL;
1173 sector_t lba;
1174 int size;
1175 u32 range;
1176 sense_reason_t ret = 0;
1177 int dl, bd_dl;
1178
1179 /* We never set ANC_SUP */
1180 if (cmd->t_task_cdb[1])
1181 return TCM_INVALID_CDB_FIELD;
1182
1183 if (cmd->data_length == 0) {
1184 target_complete_cmd(cmd, SAM_STAT_GOOD);
1185 return 0;
1186 }
1187
1188 if (cmd->data_length < 8) {
1189 pr_warn("UNMAP parameter list length %u too small\n",
1190 cmd->data_length);
1191 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1192 }
1193
1194 buf = transport_kmap_data_sg(cmd);
1195 if (!buf)
1196 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1197
1198 dl = get_unaligned_be16(&buf[0]);
1199 bd_dl = get_unaligned_be16(&buf[2]);
1200
1201 size = cmd->data_length - 8;
1202 if (bd_dl > size)
1203 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1204 cmd->data_length, bd_dl);
1205 else
1206 size = bd_dl;
1207
1208 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1209 ret = TCM_INVALID_PARAMETER_LIST;
1210 goto err;
1211 }
1212
1213 /* First UNMAP block descriptor starts at 8 byte offset */
1214 ptr = &buf[8];
1215 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1216 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1217
1218 while (size >= 16) {
1219 lba = get_unaligned_be64(&ptr[0]);
1220 range = get_unaligned_be32(&ptr[8]);
1221 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1222 (unsigned long long)lba, range);
1223
1224 if (range > dev->dev_attrib.max_unmap_lba_count) {
1225 ret = TCM_INVALID_PARAMETER_LIST;
1226 goto err;
1227 }
1228
1229 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1230 ret = TCM_ADDRESS_OUT_OF_RANGE;
1231 goto err;
1232 }
1233
1234 if (range) {
1235 ret = ops->execute_unmap(cmd, lba, range);
1236 if (ret)
1237 goto err;
1238 }
1239
1240 ptr += 16;
1241 size -= 16;
1242 }
1243
1244err:
1245 transport_kunmap_data_sg(cmd);
1246 if (!ret)
1247 target_complete_cmd(cmd, SAM_STAT_GOOD);
1248 return ret;
1249}
1250
1251void
1252sbc_dif_generate(struct se_cmd *cmd)
1253{
1254 struct se_device *dev = cmd->se_dev;
1255 struct t10_pi_tuple *sdt;
1256 struct scatterlist *dsg = cmd->t_data_sg, *psg;
1257 sector_t sector = cmd->t_task_lba;
1258 void *daddr, *paddr;
1259 int i, j, offset = 0;
1260 unsigned int block_size = dev->dev_attrib.block_size;
1261
1262 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1263 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1264 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1265
1266 for (j = 0; j < psg->length;
1267 j += sizeof(*sdt)) {
1268 __u16 crc;
1269 unsigned int avail;
1270
1271 if (offset >= dsg->length) {
1272 offset -= dsg->length;
1273 kunmap_atomic(daddr - dsg->offset);
1274 dsg = sg_next(dsg);
1275 if (!dsg) {
1276 kunmap_atomic(paddr - psg->offset);
1277 return;
1278 }
1279 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1280 }
1281
1282 sdt = paddr + j;
1283 avail = min(block_size, dsg->length - offset);
1284 crc = crc_t10dif(daddr + offset, avail);
1285 if (avail < block_size) {
1286 kunmap_atomic(daddr - dsg->offset);
1287 dsg = sg_next(dsg);
1288 if (!dsg) {
1289 kunmap_atomic(paddr - psg->offset);
1290 return;
1291 }
1292 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1293 offset = block_size - avail;
1294 crc = crc_t10dif_update(crc, daddr, offset);
1295 } else {
1296 offset += block_size;
1297 }
1298
1299 sdt->guard_tag = cpu_to_be16(crc);
1300 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1301 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1302 sdt->app_tag = 0;
1303
1304 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1305 " app_tag: 0x%04x ref_tag: %u\n",
1306 (cmd->data_direction == DMA_TO_DEVICE) ?
1307 "WRITE" : "READ", (unsigned long long)sector,
1308 sdt->guard_tag, sdt->app_tag,
1309 be32_to_cpu(sdt->ref_tag));
1310
1311 sector++;
1312 }
1313
1314 kunmap_atomic(daddr - dsg->offset);
1315 kunmap_atomic(paddr - psg->offset);
1316 }
1317}
1318
1319static sense_reason_t
1320sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt,
1321 __u16 crc, sector_t sector, unsigned int ei_lba)
1322{
1323 __be16 csum;
1324
1325 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1326 goto check_ref;
1327
1328 csum = cpu_to_be16(crc);
1329
1330 if (sdt->guard_tag != csum) {
1331 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1332 " csum 0x%04x\n", (unsigned long long)sector,
1333 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1334 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1335 }
1336
1337check_ref:
1338 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1339 return 0;
1340
1341 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1342 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1343 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1344 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1345 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1346 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1347 }
1348
1349 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1350 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1351 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1352 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1353 be32_to_cpu(sdt->ref_tag), ei_lba);
1354 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1355 }
1356
1357 return 0;
1358}
1359
1360void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1361 struct scatterlist *sg, int sg_off)
1362{
1363 struct se_device *dev = cmd->se_dev;
1364 struct scatterlist *psg;
1365 void *paddr, *addr;
1366 unsigned int i, len, left;
1367 unsigned int offset = sg_off;
1368
1369 if (!sg)
1370 return;
1371
1372 left = sectors * dev->prot_length;
1373
1374 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1375 unsigned int psg_len, copied = 0;
1376
1377 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1378 psg_len = min(left, psg->length);
1379 while (psg_len) {
1380 len = min(psg_len, sg->length - offset);
1381 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1382
1383 if (read)
1384 memcpy(paddr + copied, addr, len);
1385 else
1386 memcpy(addr, paddr + copied, len);
1387
1388 left -= len;
1389 offset += len;
1390 copied += len;
1391 psg_len -= len;
1392
1393 kunmap_atomic(addr - sg->offset - offset);
1394
1395 if (offset >= sg->length) {
1396 sg = sg_next(sg);
1397 offset = 0;
1398 }
1399 }
1400 kunmap_atomic(paddr - psg->offset);
1401 }
1402}
1403EXPORT_SYMBOL(sbc_dif_copy_prot);
1404
1405sense_reason_t
1406sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1407 unsigned int ei_lba, struct scatterlist *psg, int psg_off)
1408{
1409 struct se_device *dev = cmd->se_dev;
1410 struct t10_pi_tuple *sdt;
1411 struct scatterlist *dsg = cmd->t_data_sg;
1412 sector_t sector = start;
1413 void *daddr, *paddr;
1414 int i;
1415 sense_reason_t rc;
1416 int dsg_off = 0;
1417 unsigned int block_size = dev->dev_attrib.block_size;
1418
1419 for (; psg && sector < start + sectors; psg = sg_next(psg)) {
1420 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1421 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1422
1423 for (i = psg_off; i < psg->length &&
1424 sector < start + sectors;
1425 i += sizeof(*sdt)) {
1426 __u16 crc;
1427 unsigned int avail;
1428
1429 if (dsg_off >= dsg->length) {
1430 dsg_off -= dsg->length;
1431 kunmap_atomic(daddr - dsg->offset);
1432 dsg = sg_next(dsg);
1433 if (!dsg) {
1434 kunmap_atomic(paddr - psg->offset);
1435 return 0;
1436 }
1437 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1438 }
1439
1440 sdt = paddr + i;
1441
1442 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1443 " app_tag: 0x%04x ref_tag: %u\n",
1444 (unsigned long long)sector, sdt->guard_tag,
1445 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1446
1447 if (sdt->app_tag == T10_PI_APP_ESCAPE) {
1448 dsg_off += block_size;
1449 goto next;
1450 }
1451
1452 avail = min(block_size, dsg->length - dsg_off);
1453 crc = crc_t10dif(daddr + dsg_off, avail);
1454 if (avail < block_size) {
1455 kunmap_atomic(daddr - dsg->offset);
1456 dsg = sg_next(dsg);
1457 if (!dsg) {
1458 kunmap_atomic(paddr - psg->offset);
1459 return 0;
1460 }
1461 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1462 dsg_off = block_size - avail;
1463 crc = crc_t10dif_update(crc, daddr, dsg_off);
1464 } else {
1465 dsg_off += block_size;
1466 }
1467
1468 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
1469 if (rc) {
1470 kunmap_atomic(daddr - dsg->offset);
1471 kunmap_atomic(paddr - psg->offset);
1472 cmd->sense_info = sector;
1473 return rc;
1474 }
1475next:
1476 sector++;
1477 ei_lba++;
1478 }
1479
1480 psg_off = 0;
1481 kunmap_atomic(daddr - dsg->offset);
1482 kunmap_atomic(paddr - psg->offset);
1483 }
1484
1485 return 0;
1486}
1487EXPORT_SYMBOL(sbc_dif_verify);