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net: qmi_wwan: add Olivetti Olicard 500
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blobe0229592ec5509656aed292970af719be1f9111d
1 /*
2 * SCSI Block Commands (SBC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@kernel.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/ratelimit.h>
26 #include <linux/crc-t10dif.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_tcq.h>
30
31 #include <target/target_core_base.h>
32 #include <target/target_core_backend.h>
33 #include <target/target_core_fabric.h>
34
35 #include "target_core_internal.h"
36 #include "target_core_ua.h"
37 #include "target_core_alua.h"
38
39 static sense_reason_t
40 sbc_emulate_readcapacity(struct se_cmd *cmd)
41 {
42 struct se_device *dev = cmd->se_dev;
43 unsigned char *cdb = cmd->t_task_cdb;
44 unsigned long long blocks_long = dev->transport->get_blocks(dev);
45 unsigned char *rbuf;
46 unsigned char buf[8];
47 u32 blocks;
48
49 /*
50 * SBC-2 says:
51 * If the PMI bit is set to zero and the LOGICAL BLOCK
52 * ADDRESS field is not set to zero, the device server shall
53 * terminate the command with CHECK CONDITION status with
54 * the sense key set to ILLEGAL REQUEST and the additional
55 * sense code set to INVALID FIELD IN CDB.
56 *
57 * In SBC-3, these fields are obsolete, but some SCSI
58 * compliance tests actually check this, so we might as well
59 * follow SBC-2.
60 */
61 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
62 return TCM_INVALID_CDB_FIELD;
63
64 if (blocks_long >= 0x00000000ffffffff)
65 blocks = 0xffffffff;
66 else
67 blocks = (u32)blocks_long;
68
69 buf[0] = (blocks >> 24) & 0xff;
70 buf[1] = (blocks >> 16) & 0xff;
71 buf[2] = (blocks >> 8) & 0xff;
72 buf[3] = blocks & 0xff;
73 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
74 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
75 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
76 buf[7] = dev->dev_attrib.block_size & 0xff;
77
78 rbuf = transport_kmap_data_sg(cmd);
79 if (rbuf) {
80 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
81 transport_kunmap_data_sg(cmd);
82 }
83
84 target_complete_cmd(cmd, GOOD);
85 return 0;
86 }
87
88 static sense_reason_t
89 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
90 {
91 struct se_device *dev = cmd->se_dev;
92 struct se_session *sess = cmd->se_sess;
93 unsigned char *rbuf;
94 unsigned char buf[32];
95 unsigned long long blocks = dev->transport->get_blocks(dev);
96
97 memset(buf, 0, sizeof(buf));
98 buf[0] = (blocks >> 56) & 0xff;
99 buf[1] = (blocks >> 48) & 0xff;
100 buf[2] = (blocks >> 40) & 0xff;
101 buf[3] = (blocks >> 32) & 0xff;
102 buf[4] = (blocks >> 24) & 0xff;
103 buf[5] = (blocks >> 16) & 0xff;
104 buf[6] = (blocks >> 8) & 0xff;
105 buf[7] = blocks & 0xff;
106 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
107 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
108 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
109 buf[11] = dev->dev_attrib.block_size & 0xff;
110 /*
111 * Set P_TYPE and PROT_EN bits for DIF support
112 */
113 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
114 if (dev->dev_attrib.pi_prot_type)
115 buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1;
116 }
117
118 if (dev->transport->get_lbppbe)
119 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
120
121 if (dev->transport->get_alignment_offset_lbas) {
122 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
123 buf[14] = (lalba >> 8) & 0x3f;
124 buf[15] = lalba & 0xff;
125 }
126
127 /*
128 * Set Thin Provisioning Enable bit following sbc3r22 in section
129 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
130 */
131 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
132 buf[14] |= 0x80;
133
134 rbuf = transport_kmap_data_sg(cmd);
135 if (rbuf) {
136 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
137 transport_kunmap_data_sg(cmd);
138 }
139
140 target_complete_cmd(cmd, GOOD);
141 return 0;
142 }
143
144 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
145 {
146 u32 num_blocks;
147
148 if (cmd->t_task_cdb[0] == WRITE_SAME)
149 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
150 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
151 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
152 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
153 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
154
155 /*
156 * Use the explicit range when non zero is supplied, otherwise calculate
157 * the remaining range based on ->get_blocks() - starting LBA.
158 */
159 if (num_blocks)
160 return num_blocks;
161
162 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
163 cmd->t_task_lba + 1;
164 }
165 EXPORT_SYMBOL(sbc_get_write_same_sectors);
166
167 static sense_reason_t
168 sbc_emulate_noop(struct se_cmd *cmd)
169 {
170 target_complete_cmd(cmd, GOOD);
171 return 0;
172 }
173
174 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
175 {
176 return cmd->se_dev->dev_attrib.block_size * sectors;
177 }
178
179 static int sbc_check_valid_sectors(struct se_cmd *cmd)
180 {
181 struct se_device *dev = cmd->se_dev;
182 unsigned long long end_lba;
183 u32 sectors;
184
185 sectors = cmd->data_length / dev->dev_attrib.block_size;
186 end_lba = dev->transport->get_blocks(dev) + 1;
187
188 if (cmd->t_task_lba + sectors > end_lba) {
189 pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
190 cmd->t_task_lba, sectors, end_lba);
191 return -EINVAL;
192 }
193
194 return 0;
195 }
196
197 static inline u32 transport_get_sectors_6(unsigned char *cdb)
198 {
199 /*
200 * Use 8-bit sector value. SBC-3 says:
201 *
202 * A TRANSFER LENGTH field set to zero specifies that 256
203 * logical blocks shall be written. Any other value
204 * specifies the number of logical blocks that shall be
205 * written.
206 */
207 return cdb[4] ? : 256;
208 }
209
210 static inline u32 transport_get_sectors_10(unsigned char *cdb)
211 {
212 return (u32)(cdb[7] << 8) + cdb[8];
213 }
214
215 static inline u32 transport_get_sectors_12(unsigned char *cdb)
216 {
217 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
218 }
219
220 static inline u32 transport_get_sectors_16(unsigned char *cdb)
221 {
222 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
223 (cdb[12] << 8) + cdb[13];
224 }
225
226 /*
227 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
228 */
229 static inline u32 transport_get_sectors_32(unsigned char *cdb)
230 {
231 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
232 (cdb[30] << 8) + cdb[31];
233
234 }
235
236 static inline u32 transport_lba_21(unsigned char *cdb)
237 {
238 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
239 }
240
241 static inline u32 transport_lba_32(unsigned char *cdb)
242 {
243 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
244 }
245
246 static inline unsigned long long transport_lba_64(unsigned char *cdb)
247 {
248 unsigned int __v1, __v2;
249
250 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
251 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
252
253 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
254 }
255
256 /*
257 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
258 */
259 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
260 {
261 unsigned int __v1, __v2;
262
263 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
264 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
265
266 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
267 }
268
269 static sense_reason_t
270 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
271 {
272 unsigned int sectors = sbc_get_write_same_sectors(cmd);
273
274 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
275 pr_err("WRITE_SAME PBDATA and LBDATA"
276 " bits not supported for Block Discard"
277 " Emulation\n");
278 return TCM_UNSUPPORTED_SCSI_OPCODE;
279 }
280 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
281 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
282 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
283 return TCM_INVALID_CDB_FIELD;
284 }
285 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
286 if (flags[0] & 0x10) {
287 pr_warn("WRITE SAME with ANCHOR not supported\n");
288 return TCM_INVALID_CDB_FIELD;
289 }
290 /*
291 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
292 * translated into block discard requests within backend code.
293 */
294 if (flags[0] & 0x08) {
295 if (!ops->execute_write_same_unmap)
296 return TCM_UNSUPPORTED_SCSI_OPCODE;
297
298 cmd->execute_cmd = ops->execute_write_same_unmap;
299 return 0;
300 }
301 if (!ops->execute_write_same)
302 return TCM_UNSUPPORTED_SCSI_OPCODE;
303
304 cmd->execute_cmd = ops->execute_write_same;
305 return 0;
306 }
307
308 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
309 {
310 unsigned char *buf, *addr;
311 struct scatterlist *sg;
312 unsigned int offset;
313 sense_reason_t ret = TCM_NO_SENSE;
314 int i, count;
315 /*
316 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
317 *
318 * 1) read the specified logical block(s);
319 * 2) transfer logical blocks from the data-out buffer;
320 * 3) XOR the logical blocks transferred from the data-out buffer with
321 * the logical blocks read, storing the resulting XOR data in a buffer;
322 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
323 * blocks transferred from the data-out buffer; and
324 * 5) transfer the resulting XOR data to the data-in buffer.
325 */
326 buf = kmalloc(cmd->data_length, GFP_KERNEL);
327 if (!buf) {
328 pr_err("Unable to allocate xor_callback buf\n");
329 return TCM_OUT_OF_RESOURCES;
330 }
331 /*
332 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
333 * into the locally allocated *buf
334 */
335 sg_copy_to_buffer(cmd->t_data_sg,
336 cmd->t_data_nents,
337 buf,
338 cmd->data_length);
339
340 /*
341 * Now perform the XOR against the BIDI read memory located at
342 * cmd->t_mem_bidi_list
343 */
344
345 offset = 0;
346 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
347 addr = kmap_atomic(sg_page(sg));
348 if (!addr) {
349 ret = TCM_OUT_OF_RESOURCES;
350 goto out;
351 }
352
353 for (i = 0; i < sg->length; i++)
354 *(addr + sg->offset + i) ^= *(buf + offset + i);
355
356 offset += sg->length;
357 kunmap_atomic(addr);
358 }
359
360 out:
361 kfree(buf);
362 return ret;
363 }
364
365 static sense_reason_t
366 sbc_execute_rw(struct se_cmd *cmd)
367 {
368 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
369 cmd->data_direction);
370 }
371
372 static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
373 {
374 struct se_device *dev = cmd->se_dev;
375
376 /*
377 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
378 * within target_complete_ok_work() if the command was successfully
379 * sent to the backend driver.
380 */
381 spin_lock_irq(&cmd->t_state_lock);
382 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
383 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
384 spin_unlock_irq(&cmd->t_state_lock);
385
386 /*
387 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
388 * before the original READ I/O submission.
389 */
390 up(&dev->caw_sem);
391
392 return TCM_NO_SENSE;
393 }
394
395 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
396 {
397 struct se_device *dev = cmd->se_dev;
398 struct scatterlist *write_sg = NULL, *sg;
399 unsigned char *buf = NULL, *addr;
400 struct sg_mapping_iter m;
401 unsigned int offset = 0, len;
402 unsigned int nlbas = cmd->t_task_nolb;
403 unsigned int block_size = dev->dev_attrib.block_size;
404 unsigned int compare_len = (nlbas * block_size);
405 sense_reason_t ret = TCM_NO_SENSE;
406 int rc, i;
407
408 /*
409 * Handle early failure in transport_generic_request_failure(),
410 * which will not have taken ->caw_mutex yet..
411 */
412 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
413 return TCM_NO_SENSE;
414 /*
415 * Immediately exit + release dev->caw_sem if command has already
416 * been failed with a non-zero SCSI status.
417 */
418 if (cmd->scsi_status) {
419 pr_err("compare_and_write_callback: non zero scsi_status:"
420 " 0x%02x\n", cmd->scsi_status);
421 goto out;
422 }
423
424 buf = kzalloc(cmd->data_length, GFP_KERNEL);
425 if (!buf) {
426 pr_err("Unable to allocate compare_and_write buf\n");
427 ret = TCM_OUT_OF_RESOURCES;
428 goto out;
429 }
430
431 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
432 GFP_KERNEL);
433 if (!write_sg) {
434 pr_err("Unable to allocate compare_and_write sg\n");
435 ret = TCM_OUT_OF_RESOURCES;
436 goto out;
437 }
438 sg_init_table(write_sg, cmd->t_data_nents);
439 /*
440 * Setup verify and write data payloads from total NumberLBAs.
441 */
442 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
443 cmd->data_length);
444 if (!rc) {
445 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
446 ret = TCM_OUT_OF_RESOURCES;
447 goto out;
448 }
449 /*
450 * Compare against SCSI READ payload against verify payload
451 */
452 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
453 addr = (unsigned char *)kmap_atomic(sg_page(sg));
454 if (!addr) {
455 ret = TCM_OUT_OF_RESOURCES;
456 goto out;
457 }
458
459 len = min(sg->length, compare_len);
460
461 if (memcmp(addr, buf + offset, len)) {
462 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
463 addr, buf + offset);
464 kunmap_atomic(addr);
465 goto miscompare;
466 }
467 kunmap_atomic(addr);
468
469 offset += len;
470 compare_len -= len;
471 if (!compare_len)
472 break;
473 }
474
475 i = 0;
476 len = cmd->t_task_nolb * block_size;
477 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
478 /*
479 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
480 */
481 while (len) {
482 sg_miter_next(&m);
483
484 if (block_size < PAGE_SIZE) {
485 sg_set_page(&write_sg[i], m.page, block_size,
486 block_size);
487 } else {
488 sg_miter_next(&m);
489 sg_set_page(&write_sg[i], m.page, block_size,
490 0);
491 }
492 len -= block_size;
493 i++;
494 }
495 sg_miter_stop(&m);
496 /*
497 * Save the original SGL + nents values before updating to new
498 * assignments, to be released in transport_free_pages() ->
499 * transport_reset_sgl_orig()
500 */
501 cmd->t_data_sg_orig = cmd->t_data_sg;
502 cmd->t_data_sg = write_sg;
503 cmd->t_data_nents_orig = cmd->t_data_nents;
504 cmd->t_data_nents = 1;
505
506 cmd->sam_task_attr = MSG_HEAD_TAG;
507 cmd->transport_complete_callback = compare_and_write_post;
508 /*
509 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
510 * for submitting the adjusted SGL to write instance user-data.
511 */
512 cmd->execute_cmd = sbc_execute_rw;
513
514 spin_lock_irq(&cmd->t_state_lock);
515 cmd->t_state = TRANSPORT_PROCESSING;
516 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
517 spin_unlock_irq(&cmd->t_state_lock);
518
519 __target_execute_cmd(cmd);
520
521 kfree(buf);
522 return ret;
523
524 miscompare:
525 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
526 dev->transport->name);
527 ret = TCM_MISCOMPARE_VERIFY;
528 out:
529 /*
530 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
531 * sbc_compare_and_write() before the original READ I/O submission.
532 */
533 up(&dev->caw_sem);
534 kfree(write_sg);
535 kfree(buf);
536 return ret;
537 }
538
539 static sense_reason_t
540 sbc_compare_and_write(struct se_cmd *cmd)
541 {
542 struct se_device *dev = cmd->se_dev;
543 sense_reason_t ret;
544 int rc;
545 /*
546 * Submit the READ first for COMPARE_AND_WRITE to perform the
547 * comparision using SGLs at cmd->t_bidi_data_sg..
548 */
549 rc = down_interruptible(&dev->caw_sem);
550 if ((rc != 0) || signal_pending(current)) {
551 cmd->transport_complete_callback = NULL;
552 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
553 }
554 /*
555 * Reset cmd->data_length to individual block_size in order to not
556 * confuse backend drivers that depend on this value matching the
557 * size of the I/O being submitted.
558 */
559 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
560
561 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
562 DMA_FROM_DEVICE);
563 if (ret) {
564 cmd->transport_complete_callback = NULL;
565 up(&dev->caw_sem);
566 return ret;
567 }
568 /*
569 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
570 * upon MISCOMPARE, or in compare_and_write_done() upon completion
571 * of WRITE instance user-data.
572 */
573 return TCM_NO_SENSE;
574 }
575
576 static int
577 sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
578 bool is_write, struct se_cmd *cmd)
579 {
580 if (is_write) {
581 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS :
582 TARGET_PROT_DOUT_INSERT;
583 switch (protect) {
584 case 0x0:
585 case 0x3:
586 cmd->prot_checks = 0;
587 break;
588 case 0x1:
589 case 0x5:
590 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
591 if (prot_type == TARGET_DIF_TYPE1_PROT)
592 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
593 break;
594 case 0x2:
595 if (prot_type == TARGET_DIF_TYPE1_PROT)
596 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
597 break;
598 case 0x4:
599 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
600 break;
601 default:
602 pr_err("Unsupported protect field %d\n", protect);
603 return -EINVAL;
604 }
605 } else {
606 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS :
607 TARGET_PROT_DIN_STRIP;
608 switch (protect) {
609 case 0x0:
610 case 0x1:
611 case 0x5:
612 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
613 if (prot_type == TARGET_DIF_TYPE1_PROT)
614 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
615 break;
616 case 0x2:
617 if (prot_type == TARGET_DIF_TYPE1_PROT)
618 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
619 break;
620 case 0x3:
621 cmd->prot_checks = 0;
622 break;
623 case 0x4:
624 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
625 break;
626 default:
627 pr_err("Unsupported protect field %d\n", protect);
628 return -EINVAL;
629 }
630 }
631
632 return 0;
633 }
634
635 static bool
636 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
637 u32 sectors, bool is_write)
638 {
639 u8 protect = cdb[1] >> 5;
640
641 if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto)
642 return true;
643
644 switch (dev->dev_attrib.pi_prot_type) {
645 case TARGET_DIF_TYPE3_PROT:
646 cmd->reftag_seed = 0xffffffff;
647 break;
648 case TARGET_DIF_TYPE2_PROT:
649 if (protect)
650 return false;
651
652 cmd->reftag_seed = cmd->t_task_lba;
653 break;
654 case TARGET_DIF_TYPE1_PROT:
655 cmd->reftag_seed = cmd->t_task_lba;
656 break;
657 case TARGET_DIF_TYPE0_PROT:
658 default:
659 return true;
660 }
661
662 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
663 is_write, cmd))
664 return false;
665
666 cmd->prot_type = dev->dev_attrib.pi_prot_type;
667 cmd->prot_length = dev->prot_length * sectors;
668 pr_debug("%s: prot_type=%d, prot_length=%d prot_op=%d prot_checks=%d\n",
669 __func__, cmd->prot_type, cmd->prot_length,
670 cmd->prot_op, cmd->prot_checks);
671
672 return true;
673 }
674
675 sense_reason_t
676 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
677 {
678 struct se_device *dev = cmd->se_dev;
679 unsigned char *cdb = cmd->t_task_cdb;
680 unsigned int size;
681 u32 sectors = 0;
682 sense_reason_t ret;
683
684 switch (cdb[0]) {
685 case READ_6:
686 sectors = transport_get_sectors_6(cdb);
687 cmd->t_task_lba = transport_lba_21(cdb);
688 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
689 cmd->execute_rw = ops->execute_rw;
690 cmd->execute_cmd = sbc_execute_rw;
691 break;
692 case READ_10:
693 sectors = transport_get_sectors_10(cdb);
694 cmd->t_task_lba = transport_lba_32(cdb);
695
696 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
697 return TCM_UNSUPPORTED_SCSI_OPCODE;
698
699 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
700 cmd->execute_rw = ops->execute_rw;
701 cmd->execute_cmd = sbc_execute_rw;
702 break;
703 case READ_12:
704 sectors = transport_get_sectors_12(cdb);
705 cmd->t_task_lba = transport_lba_32(cdb);
706
707 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
708 return TCM_UNSUPPORTED_SCSI_OPCODE;
709
710 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
711 cmd->execute_rw = ops->execute_rw;
712 cmd->execute_cmd = sbc_execute_rw;
713 break;
714 case READ_16:
715 sectors = transport_get_sectors_16(cdb);
716 cmd->t_task_lba = transport_lba_64(cdb);
717
718 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
719 return TCM_UNSUPPORTED_SCSI_OPCODE;
720
721 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
722 cmd->execute_rw = ops->execute_rw;
723 cmd->execute_cmd = sbc_execute_rw;
724 break;
725 case WRITE_6:
726 sectors = transport_get_sectors_6(cdb);
727 cmd->t_task_lba = transport_lba_21(cdb);
728 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
729 cmd->execute_rw = ops->execute_rw;
730 cmd->execute_cmd = sbc_execute_rw;
731 break;
732 case WRITE_10:
733 case WRITE_VERIFY:
734 sectors = transport_get_sectors_10(cdb);
735 cmd->t_task_lba = transport_lba_32(cdb);
736
737 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
738 return TCM_UNSUPPORTED_SCSI_OPCODE;
739
740 if (cdb[1] & 0x8)
741 cmd->se_cmd_flags |= SCF_FUA;
742 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
743 cmd->execute_rw = ops->execute_rw;
744 cmd->execute_cmd = sbc_execute_rw;
745 break;
746 case WRITE_12:
747 sectors = transport_get_sectors_12(cdb);
748 cmd->t_task_lba = transport_lba_32(cdb);
749
750 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
751 return TCM_UNSUPPORTED_SCSI_OPCODE;
752
753 if (cdb[1] & 0x8)
754 cmd->se_cmd_flags |= SCF_FUA;
755 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
756 cmd->execute_rw = ops->execute_rw;
757 cmd->execute_cmd = sbc_execute_rw;
758 break;
759 case WRITE_16:
760 sectors = transport_get_sectors_16(cdb);
761 cmd->t_task_lba = transport_lba_64(cdb);
762
763 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
764 return TCM_UNSUPPORTED_SCSI_OPCODE;
765
766 if (cdb[1] & 0x8)
767 cmd->se_cmd_flags |= SCF_FUA;
768 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
769 cmd->execute_rw = ops->execute_rw;
770 cmd->execute_cmd = sbc_execute_rw;
771 break;
772 case XDWRITEREAD_10:
773 if (cmd->data_direction != DMA_TO_DEVICE ||
774 !(cmd->se_cmd_flags & SCF_BIDI))
775 return TCM_INVALID_CDB_FIELD;
776 sectors = transport_get_sectors_10(cdb);
777
778 cmd->t_task_lba = transport_lba_32(cdb);
779 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
780
781 /*
782 * Setup BIDI XOR callback to be run after I/O completion.
783 */
784 cmd->execute_rw = ops->execute_rw;
785 cmd->execute_cmd = sbc_execute_rw;
786 cmd->transport_complete_callback = &xdreadwrite_callback;
787 if (cdb[1] & 0x8)
788 cmd->se_cmd_flags |= SCF_FUA;
789 break;
790 case VARIABLE_LENGTH_CMD:
791 {
792 u16 service_action = get_unaligned_be16(&cdb[8]);
793 switch (service_action) {
794 case XDWRITEREAD_32:
795 sectors = transport_get_sectors_32(cdb);
796
797 /*
798 * Use WRITE_32 and READ_32 opcodes for the emulated
799 * XDWRITE_READ_32 logic.
800 */
801 cmd->t_task_lba = transport_lba_64_ext(cdb);
802 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
803
804 /*
805 * Setup BIDI XOR callback to be run during after I/O
806 * completion.
807 */
808 cmd->execute_rw = ops->execute_rw;
809 cmd->execute_cmd = sbc_execute_rw;
810 cmd->transport_complete_callback = &xdreadwrite_callback;
811 if (cdb[1] & 0x8)
812 cmd->se_cmd_flags |= SCF_FUA;
813 break;
814 case WRITE_SAME_32:
815 sectors = transport_get_sectors_32(cdb);
816 if (!sectors) {
817 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
818 " supported\n");
819 return TCM_INVALID_CDB_FIELD;
820 }
821
822 size = sbc_get_size(cmd, 1);
823 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
824
825 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
826 if (ret)
827 return ret;
828 break;
829 default:
830 pr_err("VARIABLE_LENGTH_CMD service action"
831 " 0x%04x not supported\n", service_action);
832 return TCM_UNSUPPORTED_SCSI_OPCODE;
833 }
834 break;
835 }
836 case COMPARE_AND_WRITE:
837 sectors = cdb[13];
838 /*
839 * Currently enforce COMPARE_AND_WRITE for a single sector
840 */
841 if (sectors > 1) {
842 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
843 " than 1\n", sectors);
844 return TCM_INVALID_CDB_FIELD;
845 }
846 /*
847 * Double size because we have two buffers, note that
848 * zero is not an error..
849 */
850 size = 2 * sbc_get_size(cmd, sectors);
851 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
852 cmd->t_task_nolb = sectors;
853 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
854 cmd->execute_rw = ops->execute_rw;
855 cmd->execute_cmd = sbc_compare_and_write;
856 cmd->transport_complete_callback = compare_and_write_callback;
857 break;
858 case READ_CAPACITY:
859 size = READ_CAP_LEN;
860 cmd->execute_cmd = sbc_emulate_readcapacity;
861 break;
862 case SERVICE_ACTION_IN:
863 switch (cmd->t_task_cdb[1] & 0x1f) {
864 case SAI_READ_CAPACITY_16:
865 cmd->execute_cmd = sbc_emulate_readcapacity_16;
866 break;
867 case SAI_REPORT_REFERRALS:
868 cmd->execute_cmd = target_emulate_report_referrals;
869 break;
870 default:
871 pr_err("Unsupported SA: 0x%02x\n",
872 cmd->t_task_cdb[1] & 0x1f);
873 return TCM_INVALID_CDB_FIELD;
874 }
875 size = (cdb[10] << 24) | (cdb[11] << 16) |
876 (cdb[12] << 8) | cdb[13];
877 break;
878 case SYNCHRONIZE_CACHE:
879 case SYNCHRONIZE_CACHE_16:
880 if (!ops->execute_sync_cache) {
881 size = 0;
882 cmd->execute_cmd = sbc_emulate_noop;
883 break;
884 }
885
886 /*
887 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
888 */
889 if (cdb[0] == SYNCHRONIZE_CACHE) {
890 sectors = transport_get_sectors_10(cdb);
891 cmd->t_task_lba = transport_lba_32(cdb);
892 } else {
893 sectors = transport_get_sectors_16(cdb);
894 cmd->t_task_lba = transport_lba_64(cdb);
895 }
896
897 size = sbc_get_size(cmd, sectors);
898
899 /*
900 * Check to ensure that LBA + Range does not exceed past end of
901 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
902 */
903 if (cmd->t_task_lba || sectors) {
904 if (sbc_check_valid_sectors(cmd) < 0)
905 return TCM_ADDRESS_OUT_OF_RANGE;
906 }
907 cmd->execute_cmd = ops->execute_sync_cache;
908 break;
909 case UNMAP:
910 if (!ops->execute_unmap)
911 return TCM_UNSUPPORTED_SCSI_OPCODE;
912
913 size = get_unaligned_be16(&cdb[7]);
914 cmd->execute_cmd = ops->execute_unmap;
915 break;
916 case WRITE_SAME_16:
917 sectors = transport_get_sectors_16(cdb);
918 if (!sectors) {
919 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
920 return TCM_INVALID_CDB_FIELD;
921 }
922
923 size = sbc_get_size(cmd, 1);
924 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
925
926 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
927 if (ret)
928 return ret;
929 break;
930 case WRITE_SAME:
931 sectors = transport_get_sectors_10(cdb);
932 if (!sectors) {
933 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
934 return TCM_INVALID_CDB_FIELD;
935 }
936
937 size = sbc_get_size(cmd, 1);
938 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
939
940 /*
941 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
942 * of byte 1 bit 3 UNMAP instead of original reserved field
943 */
944 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
945 if (ret)
946 return ret;
947 break;
948 case VERIFY:
949 size = 0;
950 cmd->execute_cmd = sbc_emulate_noop;
951 break;
952 case REZERO_UNIT:
953 case SEEK_6:
954 case SEEK_10:
955 /*
956 * There are still clients out there which use these old SCSI-2
957 * commands. This mainly happens when running VMs with legacy
958 * guest systems, connected via SCSI command pass-through to
959 * iSCSI targets. Make them happy and return status GOOD.
960 */
961 size = 0;
962 cmd->execute_cmd = sbc_emulate_noop;
963 break;
964 default:
965 ret = spc_parse_cdb(cmd, &size);
966 if (ret)
967 return ret;
968 }
969
970 /* reject any command that we don't have a handler for */
971 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
972 return TCM_UNSUPPORTED_SCSI_OPCODE;
973
974 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
975 unsigned long long end_lba;
976
977 if (sectors > dev->dev_attrib.fabric_max_sectors) {
978 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
979 " big sectors %u exceeds fabric_max_sectors:"
980 " %u\n", cdb[0], sectors,
981 dev->dev_attrib.fabric_max_sectors);
982 return TCM_INVALID_CDB_FIELD;
983 }
984 if (sectors > dev->dev_attrib.hw_max_sectors) {
985 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
986 " big sectors %u exceeds backend hw_max_sectors:"
987 " %u\n", cdb[0], sectors,
988 dev->dev_attrib.hw_max_sectors);
989 return TCM_INVALID_CDB_FIELD;
990 }
991
992 end_lba = dev->transport->get_blocks(dev) + 1;
993 if (cmd->t_task_lba + sectors > end_lba) {
994 pr_err("cmd exceeds last lba %llu "
995 "(lba %llu, sectors %u)\n",
996 end_lba, cmd->t_task_lba, sectors);
997 return TCM_ADDRESS_OUT_OF_RANGE;
998 }
999
1000 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1001 size = sbc_get_size(cmd, sectors);
1002 }
1003
1004 return target_cmd_size_check(cmd, size);
1005 }
1006 EXPORT_SYMBOL(sbc_parse_cdb);
1007
1008 u32 sbc_get_device_type(struct se_device *dev)
1009 {
1010 return TYPE_DISK;
1011 }
1012 EXPORT_SYMBOL(sbc_get_device_type);
1013
1014 sense_reason_t
1015 sbc_execute_unmap(struct se_cmd *cmd,
1016 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
1017 sector_t, sector_t),
1018 void *priv)
1019 {
1020 struct se_device *dev = cmd->se_dev;
1021 unsigned char *buf, *ptr = NULL;
1022 sector_t lba;
1023 int size;
1024 u32 range;
1025 sense_reason_t ret = 0;
1026 int dl, bd_dl;
1027
1028 /* We never set ANC_SUP */
1029 if (cmd->t_task_cdb[1])
1030 return TCM_INVALID_CDB_FIELD;
1031
1032 if (cmd->data_length == 0) {
1033 target_complete_cmd(cmd, SAM_STAT_GOOD);
1034 return 0;
1035 }
1036
1037 if (cmd->data_length < 8) {
1038 pr_warn("UNMAP parameter list length %u too small\n",
1039 cmd->data_length);
1040 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1041 }
1042
1043 buf = transport_kmap_data_sg(cmd);
1044 if (!buf)
1045 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1046
1047 dl = get_unaligned_be16(&buf[0]);
1048 bd_dl = get_unaligned_be16(&buf[2]);
1049
1050 size = cmd->data_length - 8;
1051 if (bd_dl > size)
1052 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1053 cmd->data_length, bd_dl);
1054 else
1055 size = bd_dl;
1056
1057 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1058 ret = TCM_INVALID_PARAMETER_LIST;
1059 goto err;
1060 }
1061
1062 /* First UNMAP block descriptor starts at 8 byte offset */
1063 ptr = &buf[8];
1064 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1065 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1066
1067 while (size >= 16) {
1068 lba = get_unaligned_be64(&ptr[0]);
1069 range = get_unaligned_be32(&ptr[8]);
1070 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1071 (unsigned long long)lba, range);
1072
1073 if (range > dev->dev_attrib.max_unmap_lba_count) {
1074 ret = TCM_INVALID_PARAMETER_LIST;
1075 goto err;
1076 }
1077
1078 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1079 ret = TCM_ADDRESS_OUT_OF_RANGE;
1080 goto err;
1081 }
1082
1083 ret = do_unmap_fn(cmd, priv, lba, range);
1084 if (ret)
1085 goto err;
1086
1087 ptr += 16;
1088 size -= 16;
1089 }
1090
1091 err:
1092 transport_kunmap_data_sg(cmd);
1093 if (!ret)
1094 target_complete_cmd(cmd, GOOD);
1095 return ret;
1096 }
1097 EXPORT_SYMBOL(sbc_execute_unmap);
1098
1099 void
1100 sbc_dif_generate(struct se_cmd *cmd)
1101 {
1102 struct se_device *dev = cmd->se_dev;
1103 struct se_dif_v1_tuple *sdt;
1104 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1105 sector_t sector = cmd->t_task_lba;
1106 void *daddr, *paddr;
1107 int i, j, offset = 0;
1108
1109 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1110 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1111 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1112
1113 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1114
1115 if (offset >= psg->length) {
1116 kunmap_atomic(paddr);
1117 psg = sg_next(psg);
1118 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1119 offset = 0;
1120 }
1121
1122 sdt = paddr + offset;
1123 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1124 dev->dev_attrib.block_size));
1125 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
1126 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1127 sdt->app_tag = 0;
1128
1129 pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x"
1130 " app_tag: 0x%04x ref_tag: %u\n",
1131 (unsigned long long)sector, sdt->guard_tag,
1132 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1133
1134 sector++;
1135 offset += sizeof(struct se_dif_v1_tuple);
1136 }
1137
1138 kunmap_atomic(paddr);
1139 kunmap_atomic(daddr);
1140 }
1141 }
1142
1143 static sense_reason_t
1144 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
1145 const void *p, sector_t sector, unsigned int ei_lba)
1146 {
1147 int block_size = dev->dev_attrib.block_size;
1148 __be16 csum;
1149
1150 csum = cpu_to_be16(crc_t10dif(p, block_size));
1151
1152 if (sdt->guard_tag != csum) {
1153 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1154 " csum 0x%04x\n", (unsigned long long)sector,
1155 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1156 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1157 }
1158
1159 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
1160 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1161 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1162 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1163 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1164 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1165 }
1166
1167 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
1168 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1169 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1170 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1171 be32_to_cpu(sdt->ref_tag), ei_lba);
1172 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1173 }
1174
1175 return 0;
1176 }
1177
1178 static void
1179 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1180 struct scatterlist *sg, int sg_off)
1181 {
1182 struct se_device *dev = cmd->se_dev;
1183 struct scatterlist *psg;
1184 void *paddr, *addr;
1185 unsigned int i, len, left;
1186 unsigned int offset = sg_off;
1187
1188 left = sectors * dev->prot_length;
1189
1190 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1191 unsigned int psg_len, copied = 0;
1192
1193 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1194 psg_len = min(left, psg->length);
1195 while (psg_len) {
1196 len = min(psg_len, sg->length - offset);
1197 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1198
1199 if (read)
1200 memcpy(paddr + copied, addr, len);
1201 else
1202 memcpy(addr, paddr + copied, len);
1203
1204 left -= len;
1205 offset += len;
1206 copied += len;
1207 psg_len -= len;
1208
1209 if (offset >= sg->length) {
1210 sg = sg_next(sg);
1211 offset = 0;
1212 }
1213 kunmap_atomic(addr);
1214 }
1215 kunmap_atomic(paddr);
1216 }
1217 }
1218
1219 sense_reason_t
1220 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1221 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1222 {
1223 struct se_device *dev = cmd->se_dev;
1224 struct se_dif_v1_tuple *sdt;
1225 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1226 sector_t sector = start;
1227 void *daddr, *paddr;
1228 int i, j, offset = 0;
1229 sense_reason_t rc;
1230
1231 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1232 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1233 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1234
1235 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1236
1237 if (offset >= psg->length) {
1238 kunmap_atomic(paddr);
1239 psg = sg_next(psg);
1240 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1241 offset = 0;
1242 }
1243
1244 sdt = paddr + offset;
1245
1246 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1247 " app_tag: 0x%04x ref_tag: %u\n",
1248 (unsigned long long)sector, sdt->guard_tag,
1249 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1250
1251 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1252 ei_lba);
1253 if (rc) {
1254 kunmap_atomic(paddr);
1255 kunmap_atomic(daddr);
1256 cmd->bad_sector = sector;
1257 return rc;
1258 }
1259
1260 sector++;
1261 ei_lba++;
1262 offset += sizeof(struct se_dif_v1_tuple);
1263 }
1264
1265 kunmap_atomic(paddr);
1266 kunmap_atomic(daddr);
1267 }
1268 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1269
1270 return 0;
1271 }
1272 EXPORT_SYMBOL(sbc_dif_verify_write);
1273
1274 static sense_reason_t
1275 __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1276 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1277 {
1278 struct se_device *dev = cmd->se_dev;
1279 struct se_dif_v1_tuple *sdt;
1280 struct scatterlist *dsg, *psg = sg;
1281 sector_t sector = start;
1282 void *daddr, *paddr;
1283 int i, j, offset = sg_off;
1284 sense_reason_t rc;
1285
1286 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1287 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1288 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
1289
1290 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1291
1292 if (offset >= psg->length) {
1293 kunmap_atomic(paddr);
1294 psg = sg_next(psg);
1295 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1296 offset = 0;
1297 }
1298
1299 sdt = paddr + offset;
1300
1301 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1302 " app_tag: 0x%04x ref_tag: %u\n",
1303 (unsigned long long)sector, sdt->guard_tag,
1304 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1305
1306 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1307 sector++;
1308 offset += sizeof(struct se_dif_v1_tuple);
1309 continue;
1310 }
1311
1312 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1313 ei_lba);
1314 if (rc) {
1315 kunmap_atomic(paddr);
1316 kunmap_atomic(daddr);
1317 cmd->bad_sector = sector;
1318 return rc;
1319 }
1320
1321 sector++;
1322 ei_lba++;
1323 offset += sizeof(struct se_dif_v1_tuple);
1324 }
1325
1326 kunmap_atomic(paddr);
1327 kunmap_atomic(daddr);
1328 }
1329
1330 return 0;
1331 }
1332
1333 sense_reason_t
1334 sbc_dif_read_strip(struct se_cmd *cmd)
1335 {
1336 struct se_device *dev = cmd->se_dev;
1337 u32 sectors = cmd->prot_length / dev->prot_length;
1338
1339 return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1340 cmd->t_prot_sg, 0);
1341 }
1342
1343 sense_reason_t
1344 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1345 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1346 {
1347 sense_reason_t rc;
1348
1349 rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1350 if (rc)
1351 return rc;
1352
1353 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1354 return 0;
1355 }
1356 EXPORT_SYMBOL(sbc_dif_verify_read);
Linux with added FPC-III support