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
27 static sense_reason_t
28 sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char, u32, bool);
29 static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd);
30
31 static sense_reason_t
sbc_emulate_readcapacity(struct se_cmd * cmd)32 sbc_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, GOOD, 8);
71 return 0;
72 }
73
74 static sense_reason_t
sbc_emulate_readcapacity_16(struct se_cmd * cmd)75 sbc_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, GOOD, 32);
134 return 0;
135 }
136
137 static sense_reason_t
sbc_emulate_startstop(struct se_cmd * cmd)138 sbc_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
sbc_get_write_same_sectors(struct se_cmd * cmd)169 sector_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 }
190 EXPORT_SYMBOL(sbc_get_write_same_sectors);
191
192 static sense_reason_t
sbc_execute_write_same_unmap(struct se_cmd * cmd)193 sbc_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, GOOD);
206 return 0;
207 }
208
209 static sense_reason_t
sbc_emulate_noop(struct se_cmd * cmd)210 sbc_emulate_noop(struct se_cmd *cmd)
211 {
212 target_complete_cmd(cmd, GOOD);
213 return 0;
214 }
215
sbc_get_size(struct se_cmd * cmd,u32 sectors)216 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
217 {
218 return cmd->se_dev->dev_attrib.block_size * sectors;
219 }
220
transport_get_sectors_6(unsigned char * cdb)221 static 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
transport_get_sectors_10(unsigned char * cdb)234 static inline u32 transport_get_sectors_10(unsigned char *cdb)
235 {
236 return get_unaligned_be16(&cdb[7]);
237 }
238
transport_get_sectors_12(unsigned char * cdb)239 static inline u32 transport_get_sectors_12(unsigned char *cdb)
240 {
241 return get_unaligned_be32(&cdb[6]);
242 }
243
transport_get_sectors_16(unsigned char * cdb)244 static 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 */
transport_get_sectors_32(unsigned char * cdb)252 static inline u32 transport_get_sectors_32(unsigned char *cdb)
253 {
254 return get_unaligned_be32(&cdb[28]);
255
256 }
257
transport_lba_21(unsigned char * cdb)258 static inline u32 transport_lba_21(unsigned char *cdb)
259 {
260 return get_unaligned_be24(&cdb[1]) & 0x1fffff;
261 }
262
transport_lba_32(unsigned char * cdb)263 static inline u32 transport_lba_32(unsigned char *cdb)
264 {
265 return get_unaligned_be32(&cdb[2]);
266 }
267
transport_lba_64(unsigned char * cdb)268 static 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 */
transport_lba_64_ext(unsigned char * cdb)276 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
277 {
278 return get_unaligned_be64(&cdb[12]);
279 }
280
281 static sense_reason_t
sbc_setup_write_same(struct se_cmd * cmd,unsigned char flags,struct sbc_ops * ops)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 & 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
xdreadwrite_callback(struct se_cmd * cmd,bool success,int * post_ret)342 static 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
399 out:
400 kfree(buf);
401 return ret;
402 }
403
404 static sense_reason_t
sbc_execute_rw(struct se_cmd * cmd)405 sbc_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
compare_and_write_post(struct se_cmd * cmd,bool success,int * post_ret)413 static 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
compare_and_write_callback(struct se_cmd * cmd,bool success,int * post_ret)437 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
438 int *post_ret)
439 {
440 struct se_device *dev = cmd->se_dev;
441 struct sg_table write_tbl = { };
442 struct scatterlist *write_sg, *sg;
443 unsigned char *buf = NULL, *addr;
444 struct sg_mapping_iter m;
445 unsigned int offset = 0, len;
446 unsigned int nlbas = cmd->t_task_nolb;
447 unsigned int block_size = dev->dev_attrib.block_size;
448 unsigned int compare_len = (nlbas * block_size);
449 sense_reason_t ret = TCM_NO_SENSE;
450 int rc, i;
451
452 /*
453 * Handle early failure in transport_generic_request_failure(),
454 * which will not have taken ->caw_sem yet..
455 */
456 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
457 return TCM_NO_SENSE;
458 /*
459 * Handle special case for zero-length COMPARE_AND_WRITE
460 */
461 if (!cmd->data_length)
462 goto out;
463 /*
464 * Immediately exit + release dev->caw_sem if command has already
465 * been failed with a non-zero SCSI status.
466 */
467 if (cmd->scsi_status) {
468 pr_debug("compare_and_write_callback: non zero scsi_status:"
469 " 0x%02x\n", cmd->scsi_status);
470 *post_ret = 1;
471 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
472 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
473 goto out;
474 }
475
476 buf = kzalloc(cmd->data_length, GFP_KERNEL);
477 if (!buf) {
478 pr_err("Unable to allocate compare_and_write buf\n");
479 ret = TCM_OUT_OF_RESOURCES;
480 goto out;
481 }
482
483 if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) {
484 pr_err("Unable to allocate compare_and_write sg\n");
485 ret = TCM_OUT_OF_RESOURCES;
486 goto out;
487 }
488 write_sg = write_tbl.sgl;
489 /*
490 * Setup verify and write data payloads from total NumberLBAs.
491 */
492 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
493 cmd->data_length);
494 if (!rc) {
495 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
496 ret = TCM_OUT_OF_RESOURCES;
497 goto out;
498 }
499 /*
500 * Compare against SCSI READ payload against verify payload
501 */
502 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
503 addr = (unsigned char *)kmap_atomic(sg_page(sg));
504 if (!addr) {
505 ret = TCM_OUT_OF_RESOURCES;
506 goto out;
507 }
508
509 len = min(sg->length, compare_len);
510
511 if (memcmp(addr, buf + offset, len)) {
512 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
513 addr, buf + offset);
514 kunmap_atomic(addr);
515 goto miscompare;
516 }
517 kunmap_atomic(addr);
518
519 offset += len;
520 compare_len -= len;
521 if (!compare_len)
522 break;
523 }
524
525 i = 0;
526 len = cmd->t_task_nolb * block_size;
527 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
528 /*
529 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
530 */
531 while (len) {
532 sg_miter_next(&m);
533
534 if (block_size < PAGE_SIZE) {
535 sg_set_page(&write_sg[i], m.page, block_size,
536 m.piter.sg->offset + block_size);
537 } else {
538 sg_miter_next(&m);
539 sg_set_page(&write_sg[i], m.page, block_size,
540 m.piter.sg->offset);
541 }
542 len -= block_size;
543 i++;
544 }
545 sg_miter_stop(&m);
546 /*
547 * Save the original SGL + nents values before updating to new
548 * assignments, to be released in transport_free_pages() ->
549 * transport_reset_sgl_orig()
550 */
551 cmd->t_data_sg_orig = cmd->t_data_sg;
552 cmd->t_data_sg = write_sg;
553 cmd->t_data_nents_orig = cmd->t_data_nents;
554 cmd->t_data_nents = 1;
555
556 cmd->sam_task_attr = TCM_HEAD_TAG;
557 cmd->transport_complete_callback = compare_and_write_post;
558 /*
559 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
560 * for submitting the adjusted SGL to write instance user-data.
561 */
562 cmd->execute_cmd = sbc_execute_rw;
563
564 spin_lock_irq(&cmd->t_state_lock);
565 cmd->t_state = TRANSPORT_PROCESSING;
566 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
567 spin_unlock_irq(&cmd->t_state_lock);
568
569 __target_execute_cmd(cmd, false);
570
571 kfree(buf);
572 return ret;
573
574 miscompare:
575 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
576 dev->transport->name);
577 ret = TCM_MISCOMPARE_VERIFY;
578 out:
579 /*
580 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
581 * sbc_compare_and_write() before the original READ I/O submission.
582 */
583 up(&dev->caw_sem);
584 sg_free_table(&write_tbl);
585 kfree(buf);
586 return ret;
587 }
588
589 static sense_reason_t
sbc_compare_and_write(struct se_cmd * cmd)590 sbc_compare_and_write(struct se_cmd *cmd)
591 {
592 struct sbc_ops *ops = cmd->protocol_data;
593 struct se_device *dev = cmd->se_dev;
594 sense_reason_t ret;
595 int rc;
596 /*
597 * Submit the READ first for COMPARE_AND_WRITE to perform the
598 * comparision using SGLs at cmd->t_bidi_data_sg..
599 */
600 rc = down_interruptible(&dev->caw_sem);
601 if (rc != 0) {
602 cmd->transport_complete_callback = NULL;
603 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
604 }
605 /*
606 * Reset cmd->data_length to individual block_size in order to not
607 * confuse backend drivers that depend on this value matching the
608 * size of the I/O being submitted.
609 */
610 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
611
612 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
613 DMA_FROM_DEVICE);
614 if (ret) {
615 cmd->transport_complete_callback = NULL;
616 up(&dev->caw_sem);
617 return ret;
618 }
619 /*
620 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
621 * upon MISCOMPARE, or in compare_and_write_done() upon completion
622 * of WRITE instance user-data.
623 */
624 return TCM_NO_SENSE;
625 }
626
627 static int
sbc_set_prot_op_checks(u8 protect,bool fabric_prot,enum target_prot_type prot_type,bool is_write,struct se_cmd * cmd)628 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
629 bool is_write, struct se_cmd *cmd)
630 {
631 if (is_write) {
632 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
633 protect ? TARGET_PROT_DOUT_PASS :
634 TARGET_PROT_DOUT_INSERT;
635 switch (protect) {
636 case 0x0:
637 case 0x3:
638 cmd->prot_checks = 0;
639 break;
640 case 0x1:
641 case 0x5:
642 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
643 if (prot_type == TARGET_DIF_TYPE1_PROT)
644 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
645 break;
646 case 0x2:
647 if (prot_type == TARGET_DIF_TYPE1_PROT)
648 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
649 break;
650 case 0x4:
651 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
652 break;
653 default:
654 pr_err("Unsupported protect field %d\n", protect);
655 return -EINVAL;
656 }
657 } else {
658 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
659 protect ? TARGET_PROT_DIN_PASS :
660 TARGET_PROT_DIN_STRIP;
661 switch (protect) {
662 case 0x0:
663 case 0x1:
664 case 0x5:
665 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
666 if (prot_type == TARGET_DIF_TYPE1_PROT)
667 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
668 break;
669 case 0x2:
670 if (prot_type == TARGET_DIF_TYPE1_PROT)
671 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
672 break;
673 case 0x3:
674 cmd->prot_checks = 0;
675 break;
676 case 0x4:
677 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
678 break;
679 default:
680 pr_err("Unsupported protect field %d\n", protect);
681 return -EINVAL;
682 }
683 }
684
685 return 0;
686 }
687
688 static sense_reason_t
sbc_check_prot(struct se_device * dev,struct se_cmd * cmd,unsigned char protect,u32 sectors,bool is_write)689 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char protect,
690 u32 sectors, bool is_write)
691 {
692 int sp_ops = cmd->se_sess->sup_prot_ops;
693 int pi_prot_type = dev->dev_attrib.pi_prot_type;
694 bool fabric_prot = false;
695
696 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
697 if (unlikely(protect &&
698 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
699 pr_err("CDB contains protect bit, but device + fabric does"
700 " not advertise PROTECT=1 feature bit\n");
701 return TCM_INVALID_CDB_FIELD;
702 }
703 if (cmd->prot_pto)
704 return TCM_NO_SENSE;
705 }
706
707 switch (dev->dev_attrib.pi_prot_type) {
708 case TARGET_DIF_TYPE3_PROT:
709 cmd->reftag_seed = 0xffffffff;
710 break;
711 case TARGET_DIF_TYPE2_PROT:
712 if (protect)
713 return TCM_INVALID_CDB_FIELD;
714
715 cmd->reftag_seed = cmd->t_task_lba;
716 break;
717 case TARGET_DIF_TYPE1_PROT:
718 cmd->reftag_seed = cmd->t_task_lba;
719 break;
720 case TARGET_DIF_TYPE0_PROT:
721 /*
722 * See if the fabric supports T10-PI, and the session has been
723 * configured to allow export PROTECT=1 feature bit with backend
724 * devices that don't support T10-PI.
725 */
726 fabric_prot = is_write ?
727 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
728 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
729
730 if (fabric_prot && cmd->se_sess->sess_prot_type) {
731 pi_prot_type = cmd->se_sess->sess_prot_type;
732 break;
733 }
734 if (!protect)
735 return TCM_NO_SENSE;
736 fallthrough;
737 default:
738 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
739 "PROTECT: 0x%02x\n", cmd->t_task_cdb[0], protect);
740 return TCM_INVALID_CDB_FIELD;
741 }
742
743 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
744 return TCM_INVALID_CDB_FIELD;
745
746 cmd->prot_type = pi_prot_type;
747 cmd->prot_length = dev->prot_length * sectors;
748
749 /**
750 * In case protection information exists over the wire
751 * we modify command data length to describe pure data.
752 * The actual transfer length is data length + protection
753 * length
754 **/
755 if (protect)
756 cmd->data_length = sectors * dev->dev_attrib.block_size;
757
758 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
759 "prot_op=%d prot_checks=%d\n",
760 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
761 cmd->prot_op, cmd->prot_checks);
762
763 return TCM_NO_SENSE;
764 }
765
766 static int
sbc_check_dpofua(struct se_device * dev,struct se_cmd * cmd,unsigned char * cdb)767 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
768 {
769 if (cdb[1] & 0x10) {
770 /* see explanation in spc_emulate_modesense */
771 if (!target_check_fua(dev)) {
772 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
773 " does not advertise support for DPO\n", cdb[0]);
774 return -EINVAL;
775 }
776 }
777 if (cdb[1] & 0x8) {
778 if (!target_check_fua(dev)) {
779 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
780 " does not advertise support for FUA write\n",
781 cdb[0]);
782 return -EINVAL;
783 }
784 cmd->se_cmd_flags |= SCF_FUA;
785 }
786 return 0;
787 }
788
789 sense_reason_t
sbc_parse_cdb(struct se_cmd * cmd,struct sbc_ops * ops)790 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
791 {
792 struct se_device *dev = cmd->se_dev;
793 unsigned char *cdb = cmd->t_task_cdb;
794 unsigned int size;
795 u32 sectors = 0;
796 sense_reason_t ret;
797
798 cmd->protocol_data = ops;
799
800 switch (cdb[0]) {
801 case READ_6:
802 sectors = transport_get_sectors_6(cdb);
803 cmd->t_task_lba = transport_lba_21(cdb);
804 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
805 cmd->execute_cmd = sbc_execute_rw;
806 break;
807 case READ_10:
808 sectors = transport_get_sectors_10(cdb);
809 cmd->t_task_lba = transport_lba_32(cdb);
810
811 if (sbc_check_dpofua(dev, cmd, cdb))
812 return TCM_INVALID_CDB_FIELD;
813
814 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
815 if (ret)
816 return ret;
817
818 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
819 cmd->execute_cmd = sbc_execute_rw;
820 break;
821 case READ_12:
822 sectors = transport_get_sectors_12(cdb);
823 cmd->t_task_lba = transport_lba_32(cdb);
824
825 if (sbc_check_dpofua(dev, cmd, cdb))
826 return TCM_INVALID_CDB_FIELD;
827
828 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
829 if (ret)
830 return ret;
831
832 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
833 cmd->execute_cmd = sbc_execute_rw;
834 break;
835 case READ_16:
836 sectors = transport_get_sectors_16(cdb);
837 cmd->t_task_lba = transport_lba_64(cdb);
838
839 if (sbc_check_dpofua(dev, cmd, cdb))
840 return TCM_INVALID_CDB_FIELD;
841
842 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
843 if (ret)
844 return ret;
845
846 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
847 cmd->execute_cmd = sbc_execute_rw;
848 break;
849 case WRITE_6:
850 sectors = transport_get_sectors_6(cdb);
851 cmd->t_task_lba = transport_lba_21(cdb);
852 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
853 cmd->execute_cmd = sbc_execute_rw;
854 break;
855 case WRITE_10:
856 case WRITE_VERIFY:
857 sectors = transport_get_sectors_10(cdb);
858 cmd->t_task_lba = transport_lba_32(cdb);
859
860 if (sbc_check_dpofua(dev, cmd, cdb))
861 return TCM_INVALID_CDB_FIELD;
862
863 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
864 if (ret)
865 return ret;
866
867 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
868 cmd->execute_cmd = sbc_execute_rw;
869 break;
870 case WRITE_12:
871 sectors = transport_get_sectors_12(cdb);
872 cmd->t_task_lba = transport_lba_32(cdb);
873
874 if (sbc_check_dpofua(dev, cmd, cdb))
875 return TCM_INVALID_CDB_FIELD;
876
877 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
878 if (ret)
879 return ret;
880
881 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
882 cmd->execute_cmd = sbc_execute_rw;
883 break;
884 case WRITE_16:
885 case WRITE_VERIFY_16:
886 sectors = transport_get_sectors_16(cdb);
887 cmd->t_task_lba = transport_lba_64(cdb);
888
889 if (sbc_check_dpofua(dev, cmd, cdb))
890 return TCM_INVALID_CDB_FIELD;
891
892 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
893 if (ret)
894 return ret;
895
896 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
897 cmd->execute_cmd = sbc_execute_rw;
898 break;
899 case XDWRITEREAD_10:
900 if (cmd->data_direction != DMA_TO_DEVICE ||
901 !(cmd->se_cmd_flags & SCF_BIDI))
902 return TCM_INVALID_CDB_FIELD;
903 sectors = transport_get_sectors_10(cdb);
904
905 if (sbc_check_dpofua(dev, cmd, cdb))
906 return TCM_INVALID_CDB_FIELD;
907
908 cmd->t_task_lba = transport_lba_32(cdb);
909 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
910
911 /*
912 * Setup BIDI XOR callback to be run after I/O completion.
913 */
914 cmd->execute_cmd = sbc_execute_rw;
915 cmd->transport_complete_callback = &xdreadwrite_callback;
916 break;
917 case VARIABLE_LENGTH_CMD:
918 {
919 u16 service_action = get_unaligned_be16(&cdb[8]);
920 switch (service_action) {
921 case XDWRITEREAD_32:
922 sectors = transport_get_sectors_32(cdb);
923
924 if (sbc_check_dpofua(dev, cmd, cdb))
925 return TCM_INVALID_CDB_FIELD;
926 /*
927 * Use WRITE_32 and READ_32 opcodes for the emulated
928 * XDWRITE_READ_32 logic.
929 */
930 cmd->t_task_lba = transport_lba_64_ext(cdb);
931 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
932
933 /*
934 * Setup BIDI XOR callback to be run during after I/O
935 * completion.
936 */
937 cmd->execute_cmd = sbc_execute_rw;
938 cmd->transport_complete_callback = &xdreadwrite_callback;
939 break;
940 case WRITE_SAME_32:
941 sectors = transport_get_sectors_32(cdb);
942 if (!sectors) {
943 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
944 " supported\n");
945 return TCM_INVALID_CDB_FIELD;
946 }
947
948 size = sbc_get_size(cmd, 1);
949 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
950
951 ret = sbc_setup_write_same(cmd, cdb[10], ops);
952 if (ret)
953 return ret;
954 break;
955 default:
956 pr_err("VARIABLE_LENGTH_CMD service action"
957 " 0x%04x not supported\n", service_action);
958 return TCM_UNSUPPORTED_SCSI_OPCODE;
959 }
960 break;
961 }
962 case COMPARE_AND_WRITE:
963 if (!dev->dev_attrib.emulate_caw) {
964 pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject COMPARE_AND_WRITE\n",
965 dev->se_hba->backend->ops->name,
966 config_item_name(&dev->dev_group.cg_item),
967 dev->t10_wwn.unit_serial);
968 return TCM_UNSUPPORTED_SCSI_OPCODE;
969 }
970 sectors = cdb[13];
971 /*
972 * Currently enforce COMPARE_AND_WRITE for a single sector
973 */
974 if (sectors > 1) {
975 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
976 " than 1\n", sectors);
977 return TCM_INVALID_CDB_FIELD;
978 }
979 if (sbc_check_dpofua(dev, cmd, cdb))
980 return TCM_INVALID_CDB_FIELD;
981
982 /*
983 * Double size because we have two buffers, note that
984 * zero is not an error..
985 */
986 size = 2 * sbc_get_size(cmd, sectors);
987 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
988 cmd->t_task_nolb = sectors;
989 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
990 cmd->execute_cmd = sbc_compare_and_write;
991 cmd->transport_complete_callback = compare_and_write_callback;
992 break;
993 case READ_CAPACITY:
994 size = READ_CAP_LEN;
995 cmd->execute_cmd = sbc_emulate_readcapacity;
996 break;
997 case SERVICE_ACTION_IN_16:
998 switch (cmd->t_task_cdb[1] & 0x1f) {
999 case SAI_READ_CAPACITY_16:
1000 cmd->execute_cmd = sbc_emulate_readcapacity_16;
1001 break;
1002 case SAI_REPORT_REFERRALS:
1003 cmd->execute_cmd = target_emulate_report_referrals;
1004 break;
1005 default:
1006 pr_err("Unsupported SA: 0x%02x\n",
1007 cmd->t_task_cdb[1] & 0x1f);
1008 return TCM_INVALID_CDB_FIELD;
1009 }
1010 size = get_unaligned_be32(&cdb[10]);
1011 break;
1012 case SYNCHRONIZE_CACHE:
1013 case SYNCHRONIZE_CACHE_16:
1014 if (cdb[0] == SYNCHRONIZE_CACHE) {
1015 sectors = transport_get_sectors_10(cdb);
1016 cmd->t_task_lba = transport_lba_32(cdb);
1017 } else {
1018 sectors = transport_get_sectors_16(cdb);
1019 cmd->t_task_lba = transport_lba_64(cdb);
1020 }
1021 if (ops->execute_sync_cache) {
1022 cmd->execute_cmd = ops->execute_sync_cache;
1023 goto check_lba;
1024 }
1025 size = 0;
1026 cmd->execute_cmd = sbc_emulate_noop;
1027 break;
1028 case UNMAP:
1029 if (!ops->execute_unmap)
1030 return TCM_UNSUPPORTED_SCSI_OPCODE;
1031
1032 if (!dev->dev_attrib.emulate_tpu) {
1033 pr_err("Got UNMAP, but backend device has"
1034 " emulate_tpu disabled\n");
1035 return TCM_UNSUPPORTED_SCSI_OPCODE;
1036 }
1037 size = get_unaligned_be16(&cdb[7]);
1038 cmd->execute_cmd = sbc_execute_unmap;
1039 break;
1040 case WRITE_SAME_16:
1041 sectors = transport_get_sectors_16(cdb);
1042 if (!sectors) {
1043 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1044 return TCM_INVALID_CDB_FIELD;
1045 }
1046
1047 size = sbc_get_size(cmd, 1);
1048 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1049
1050 ret = sbc_setup_write_same(cmd, cdb[1], ops);
1051 if (ret)
1052 return ret;
1053 break;
1054 case WRITE_SAME:
1055 sectors = transport_get_sectors_10(cdb);
1056 if (!sectors) {
1057 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1058 return TCM_INVALID_CDB_FIELD;
1059 }
1060
1061 size = sbc_get_size(cmd, 1);
1062 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1063
1064 /*
1065 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1066 * of byte 1 bit 3 UNMAP instead of original reserved field
1067 */
1068 ret = sbc_setup_write_same(cmd, cdb[1], ops);
1069 if (ret)
1070 return ret;
1071 break;
1072 case VERIFY:
1073 case VERIFY_16:
1074 size = 0;
1075 if (cdb[0] == VERIFY) {
1076 sectors = transport_get_sectors_10(cdb);
1077 cmd->t_task_lba = transport_lba_32(cdb);
1078 } else {
1079 sectors = transport_get_sectors_16(cdb);
1080 cmd->t_task_lba = transport_lba_64(cdb);
1081 }
1082 cmd->execute_cmd = sbc_emulate_noop;
1083 goto check_lba;
1084 case REZERO_UNIT:
1085 case SEEK_6:
1086 case SEEK_10:
1087 /*
1088 * There are still clients out there which use these old SCSI-2
1089 * commands. This mainly happens when running VMs with legacy
1090 * guest systems, connected via SCSI command pass-through to
1091 * iSCSI targets. Make them happy and return status GOOD.
1092 */
1093 size = 0;
1094 cmd->execute_cmd = sbc_emulate_noop;
1095 break;
1096 case START_STOP:
1097 size = 0;
1098 cmd->execute_cmd = sbc_emulate_startstop;
1099 break;
1100 default:
1101 ret = spc_parse_cdb(cmd, &size);
1102 if (ret)
1103 return ret;
1104 }
1105
1106 /* reject any command that we don't have a handler for */
1107 if (!cmd->execute_cmd)
1108 return TCM_UNSUPPORTED_SCSI_OPCODE;
1109
1110 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1111 unsigned long long end_lba;
1112 check_lba:
1113 end_lba = dev->transport->get_blocks(dev) + 1;
1114 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1115 ((cmd->t_task_lba + sectors) > end_lba)) {
1116 pr_err("cmd exceeds last lba %llu "
1117 "(lba %llu, sectors %u)\n",
1118 end_lba, cmd->t_task_lba, sectors);
1119 return TCM_ADDRESS_OUT_OF_RANGE;
1120 }
1121
1122 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1123 size = sbc_get_size(cmd, sectors);
1124 }
1125
1126 return target_cmd_size_check(cmd, size);
1127 }
1128 EXPORT_SYMBOL(sbc_parse_cdb);
1129
sbc_get_device_type(struct se_device * dev)1130 u32 sbc_get_device_type(struct se_device *dev)
1131 {
1132 return TYPE_DISK;
1133 }
1134 EXPORT_SYMBOL(sbc_get_device_type);
1135
1136 static sense_reason_t
sbc_execute_unmap(struct se_cmd * cmd)1137 sbc_execute_unmap(struct se_cmd *cmd)
1138 {
1139 struct sbc_ops *ops = cmd->protocol_data;
1140 struct se_device *dev = cmd->se_dev;
1141 unsigned char *buf, *ptr = NULL;
1142 sector_t lba;
1143 int size;
1144 u32 range;
1145 sense_reason_t ret = 0;
1146 int dl, bd_dl;
1147
1148 /* We never set ANC_SUP */
1149 if (cmd->t_task_cdb[1])
1150 return TCM_INVALID_CDB_FIELD;
1151
1152 if (cmd->data_length == 0) {
1153 target_complete_cmd(cmd, SAM_STAT_GOOD);
1154 return 0;
1155 }
1156
1157 if (cmd->data_length < 8) {
1158 pr_warn("UNMAP parameter list length %u too small\n",
1159 cmd->data_length);
1160 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1161 }
1162
1163 buf = transport_kmap_data_sg(cmd);
1164 if (!buf)
1165 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1166
1167 dl = get_unaligned_be16(&buf[0]);
1168 bd_dl = get_unaligned_be16(&buf[2]);
1169
1170 size = cmd->data_length - 8;
1171 if (bd_dl > size)
1172 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1173 cmd->data_length, bd_dl);
1174 else
1175 size = bd_dl;
1176
1177 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1178 ret = TCM_INVALID_PARAMETER_LIST;
1179 goto err;
1180 }
1181
1182 /* First UNMAP block descriptor starts at 8 byte offset */
1183 ptr = &buf[8];
1184 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1185 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1186
1187 while (size >= 16) {
1188 lba = get_unaligned_be64(&ptr[0]);
1189 range = get_unaligned_be32(&ptr[8]);
1190 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1191 (unsigned long long)lba, range);
1192
1193 if (range > dev->dev_attrib.max_unmap_lba_count) {
1194 ret = TCM_INVALID_PARAMETER_LIST;
1195 goto err;
1196 }
1197
1198 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1199 ret = TCM_ADDRESS_OUT_OF_RANGE;
1200 goto err;
1201 }
1202
1203 if (range) {
1204 ret = ops->execute_unmap(cmd, lba, range);
1205 if (ret)
1206 goto err;
1207 }
1208
1209 ptr += 16;
1210 size -= 16;
1211 }
1212
1213 err:
1214 transport_kunmap_data_sg(cmd);
1215 if (!ret)
1216 target_complete_cmd(cmd, GOOD);
1217 return ret;
1218 }
1219
1220 void
sbc_dif_generate(struct se_cmd * cmd)1221 sbc_dif_generate(struct se_cmd *cmd)
1222 {
1223 struct se_device *dev = cmd->se_dev;
1224 struct t10_pi_tuple *sdt;
1225 struct scatterlist *dsg = cmd->t_data_sg, *psg;
1226 sector_t sector = cmd->t_task_lba;
1227 void *daddr, *paddr;
1228 int i, j, offset = 0;
1229 unsigned int block_size = dev->dev_attrib.block_size;
1230
1231 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1232 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1233 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1234
1235 for (j = 0; j < psg->length;
1236 j += sizeof(*sdt)) {
1237 __u16 crc;
1238 unsigned int avail;
1239
1240 if (offset >= dsg->length) {
1241 offset -= dsg->length;
1242 kunmap_atomic(daddr - dsg->offset);
1243 dsg = sg_next(dsg);
1244 if (!dsg) {
1245 kunmap_atomic(paddr - psg->offset);
1246 return;
1247 }
1248 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1249 }
1250
1251 sdt = paddr + j;
1252 avail = min(block_size, dsg->length - offset);
1253 crc = crc_t10dif(daddr + offset, avail);
1254 if (avail < block_size) {
1255 kunmap_atomic(daddr - dsg->offset);
1256 dsg = sg_next(dsg);
1257 if (!dsg) {
1258 kunmap_atomic(paddr - psg->offset);
1259 return;
1260 }
1261 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1262 offset = block_size - avail;
1263 crc = crc_t10dif_update(crc, daddr, offset);
1264 } else {
1265 offset += block_size;
1266 }
1267
1268 sdt->guard_tag = cpu_to_be16(crc);
1269 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1270 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1271 sdt->app_tag = 0;
1272
1273 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1274 " app_tag: 0x%04x ref_tag: %u\n",
1275 (cmd->data_direction == DMA_TO_DEVICE) ?
1276 "WRITE" : "READ", (unsigned long long)sector,
1277 sdt->guard_tag, sdt->app_tag,
1278 be32_to_cpu(sdt->ref_tag));
1279
1280 sector++;
1281 }
1282
1283 kunmap_atomic(daddr - dsg->offset);
1284 kunmap_atomic(paddr - psg->offset);
1285 }
1286 }
1287
1288 static sense_reason_t
sbc_dif_v1_verify(struct se_cmd * cmd,struct t10_pi_tuple * sdt,__u16 crc,sector_t sector,unsigned int ei_lba)1289 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt,
1290 __u16 crc, sector_t sector, unsigned int ei_lba)
1291 {
1292 __be16 csum;
1293
1294 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1295 goto check_ref;
1296
1297 csum = cpu_to_be16(crc);
1298
1299 if (sdt->guard_tag != csum) {
1300 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1301 " csum 0x%04x\n", (unsigned long long)sector,
1302 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1303 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1304 }
1305
1306 check_ref:
1307 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1308 return 0;
1309
1310 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1311 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1312 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1313 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1314 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1315 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1316 }
1317
1318 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1319 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1320 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1321 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1322 be32_to_cpu(sdt->ref_tag), ei_lba);
1323 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1324 }
1325
1326 return 0;
1327 }
1328
sbc_dif_copy_prot(struct se_cmd * cmd,unsigned int sectors,bool read,struct scatterlist * sg,int sg_off)1329 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1330 struct scatterlist *sg, int sg_off)
1331 {
1332 struct se_device *dev = cmd->se_dev;
1333 struct scatterlist *psg;
1334 void *paddr, *addr;
1335 unsigned int i, len, left;
1336 unsigned int offset = sg_off;
1337
1338 if (!sg)
1339 return;
1340
1341 left = sectors * dev->prot_length;
1342
1343 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1344 unsigned int psg_len, copied = 0;
1345
1346 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1347 psg_len = min(left, psg->length);
1348 while (psg_len) {
1349 len = min(psg_len, sg->length - offset);
1350 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1351
1352 if (read)
1353 memcpy(paddr + copied, addr, len);
1354 else
1355 memcpy(addr, paddr + copied, len);
1356
1357 left -= len;
1358 offset += len;
1359 copied += len;
1360 psg_len -= len;
1361
1362 kunmap_atomic(addr - sg->offset - offset);
1363
1364 if (offset >= sg->length) {
1365 sg = sg_next(sg);
1366 offset = 0;
1367 }
1368 }
1369 kunmap_atomic(paddr - psg->offset);
1370 }
1371 }
1372 EXPORT_SYMBOL(sbc_dif_copy_prot);
1373
1374 sense_reason_t
sbc_dif_verify(struct se_cmd * cmd,sector_t start,unsigned int sectors,unsigned int ei_lba,struct scatterlist * psg,int psg_off)1375 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1376 unsigned int ei_lba, struct scatterlist *psg, int psg_off)
1377 {
1378 struct se_device *dev = cmd->se_dev;
1379 struct t10_pi_tuple *sdt;
1380 struct scatterlist *dsg = cmd->t_data_sg;
1381 sector_t sector = start;
1382 void *daddr, *paddr;
1383 int i;
1384 sense_reason_t rc;
1385 int dsg_off = 0;
1386 unsigned int block_size = dev->dev_attrib.block_size;
1387
1388 for (; psg && sector < start + sectors; psg = sg_next(psg)) {
1389 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1390 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1391
1392 for (i = psg_off; i < psg->length &&
1393 sector < start + sectors;
1394 i += sizeof(*sdt)) {
1395 __u16 crc;
1396 unsigned int avail;
1397
1398 if (dsg_off >= dsg->length) {
1399 dsg_off -= dsg->length;
1400 kunmap_atomic(daddr - dsg->offset);
1401 dsg = sg_next(dsg);
1402 if (!dsg) {
1403 kunmap_atomic(paddr - psg->offset);
1404 return 0;
1405 }
1406 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1407 }
1408
1409 sdt = paddr + i;
1410
1411 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1412 " app_tag: 0x%04x ref_tag: %u\n",
1413 (unsigned long long)sector, sdt->guard_tag,
1414 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1415
1416 if (sdt->app_tag == T10_PI_APP_ESCAPE) {
1417 dsg_off += block_size;
1418 goto next;
1419 }
1420
1421 avail = min(block_size, dsg->length - dsg_off);
1422 crc = crc_t10dif(daddr + dsg_off, avail);
1423 if (avail < block_size) {
1424 kunmap_atomic(daddr - dsg->offset);
1425 dsg = sg_next(dsg);
1426 if (!dsg) {
1427 kunmap_atomic(paddr - psg->offset);
1428 return 0;
1429 }
1430 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1431 dsg_off = block_size - avail;
1432 crc = crc_t10dif_update(crc, daddr, dsg_off);
1433 } else {
1434 dsg_off += block_size;
1435 }
1436
1437 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
1438 if (rc) {
1439 kunmap_atomic(daddr - dsg->offset);
1440 kunmap_atomic(paddr - psg->offset);
1441 cmd->bad_sector = sector;
1442 return rc;
1443 }
1444 next:
1445 sector++;
1446 ei_lba++;
1447 }
1448
1449 psg_off = 0;
1450 kunmap_atomic(daddr - dsg->offset);
1451 kunmap_atomic(paddr - psg->offset);
1452 }
1453
1454 return 0;
1455 }
1456 EXPORT_SYMBOL(sbc_dif_verify);
1457