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Bluetooth: hci_uart: Use generic functionality from Broadcom module
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blob3e729741111075cf4828a46ac2f434414e70faf1
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_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool);
41
42 static sense_reason_t
43 sbc_emulate_readcapacity(struct se_cmd *cmd)
44 {
45 struct se_device *dev = cmd->se_dev;
46 unsigned char *cdb = cmd->t_task_cdb;
47 unsigned long long blocks_long = dev->transport->get_blocks(dev);
48 unsigned char *rbuf;
49 unsigned char buf[8];
50 u32 blocks;
51
52 /*
53 * SBC-2 says:
54 * If the PMI bit is set to zero and the LOGICAL BLOCK
55 * ADDRESS field is not set to zero, the device server shall
56 * terminate the command with CHECK CONDITION status with
57 * the sense key set to ILLEGAL REQUEST and the additional
58 * sense code set to INVALID FIELD IN CDB.
59 *
60 * In SBC-3, these fields are obsolete, but some SCSI
61 * compliance tests actually check this, so we might as well
62 * follow SBC-2.
63 */
64 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
65 return TCM_INVALID_CDB_FIELD;
66
67 if (blocks_long >= 0x00000000ffffffff)
68 blocks = 0xffffffff;
69 else
70 blocks = (u32)blocks_long;
71
72 buf[0] = (blocks >> 24) & 0xff;
73 buf[1] = (blocks >> 16) & 0xff;
74 buf[2] = (blocks >> 8) & 0xff;
75 buf[3] = blocks & 0xff;
76 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
77 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
78 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
79 buf[7] = dev->dev_attrib.block_size & 0xff;
80
81 rbuf = transport_kmap_data_sg(cmd);
82 if (rbuf) {
83 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
84 transport_kunmap_data_sg(cmd);
85 }
86
87 target_complete_cmd_with_length(cmd, GOOD, 8);
88 return 0;
89 }
90
91 static sense_reason_t
92 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
93 {
94 struct se_device *dev = cmd->se_dev;
95 struct se_session *sess = cmd->se_sess;
96 unsigned char *rbuf;
97 unsigned char buf[32];
98 unsigned long long blocks = dev->transport->get_blocks(dev);
99
100 memset(buf, 0, sizeof(buf));
101 buf[0] = (blocks >> 56) & 0xff;
102 buf[1] = (blocks >> 48) & 0xff;
103 buf[2] = (blocks >> 40) & 0xff;
104 buf[3] = (blocks >> 32) & 0xff;
105 buf[4] = (blocks >> 24) & 0xff;
106 buf[5] = (blocks >> 16) & 0xff;
107 buf[6] = (blocks >> 8) & 0xff;
108 buf[7] = blocks & 0xff;
109 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
110 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
111 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
112 buf[11] = dev->dev_attrib.block_size & 0xff;
113 /*
114 * Set P_TYPE and PROT_EN bits for DIF support
115 */
116 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
117 if (dev->dev_attrib.pi_prot_type)
118 buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1;
119 }
120
121 if (dev->transport->get_lbppbe)
122 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
123
124 if (dev->transport->get_alignment_offset_lbas) {
125 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
126 buf[14] = (lalba >> 8) & 0x3f;
127 buf[15] = lalba & 0xff;
128 }
129
130 /*
131 * Set Thin Provisioning Enable bit following sbc3r22 in section
132 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
133 */
134 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
135 buf[14] |= 0x80;
136
137 rbuf = transport_kmap_data_sg(cmd);
138 if (rbuf) {
139 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
140 transport_kunmap_data_sg(cmd);
141 }
142
143 target_complete_cmd_with_length(cmd, GOOD, 32);
144 return 0;
145 }
146
147 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
148 {
149 u32 num_blocks;
150
151 if (cmd->t_task_cdb[0] == WRITE_SAME)
152 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
153 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
154 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
155 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
156 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
157
158 /*
159 * Use the explicit range when non zero is supplied, otherwise calculate
160 * the remaining range based on ->get_blocks() - starting LBA.
161 */
162 if (num_blocks)
163 return num_blocks;
164
165 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
166 cmd->t_task_lba + 1;
167 }
168 EXPORT_SYMBOL(sbc_get_write_same_sectors);
169
170 static sense_reason_t
171 sbc_emulate_noop(struct se_cmd *cmd)
172 {
173 target_complete_cmd(cmd, GOOD);
174 return 0;
175 }
176
177 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
178 {
179 return cmd->se_dev->dev_attrib.block_size * sectors;
180 }
181
182 static inline u32 transport_get_sectors_6(unsigned char *cdb)
183 {
184 /*
185 * Use 8-bit sector value. SBC-3 says:
186 *
187 * A TRANSFER LENGTH field set to zero specifies that 256
188 * logical blocks shall be written. Any other value
189 * specifies the number of logical blocks that shall be
190 * written.
191 */
192 return cdb[4] ? : 256;
193 }
194
195 static inline u32 transport_get_sectors_10(unsigned char *cdb)
196 {
197 return (u32)(cdb[7] << 8) + cdb[8];
198 }
199
200 static inline u32 transport_get_sectors_12(unsigned char *cdb)
201 {
202 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
203 }
204
205 static inline u32 transport_get_sectors_16(unsigned char *cdb)
206 {
207 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
208 (cdb[12] << 8) + cdb[13];
209 }
210
211 /*
212 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
213 */
214 static inline u32 transport_get_sectors_32(unsigned char *cdb)
215 {
216 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
217 (cdb[30] << 8) + cdb[31];
218
219 }
220
221 static inline u32 transport_lba_21(unsigned char *cdb)
222 {
223 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
224 }
225
226 static inline u32 transport_lba_32(unsigned char *cdb)
227 {
228 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
229 }
230
231 static inline unsigned long long transport_lba_64(unsigned char *cdb)
232 {
233 unsigned int __v1, __v2;
234
235 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
236 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
237
238 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
239 }
240
241 /*
242 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
243 */
244 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
245 {
246 unsigned int __v1, __v2;
247
248 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
249 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
250
251 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
252 }
253
254 static sense_reason_t
255 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
256 {
257 struct se_device *dev = cmd->se_dev;
258 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
259 unsigned int sectors = sbc_get_write_same_sectors(cmd);
260 sense_reason_t ret;
261
262 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
263 pr_err("WRITE_SAME PBDATA and LBDATA"
264 " bits not supported for Block Discard"
265 " Emulation\n");
266 return TCM_UNSUPPORTED_SCSI_OPCODE;
267 }
268 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
269 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
270 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
271 return TCM_INVALID_CDB_FIELD;
272 }
273 /*
274 * Sanity check for LBA wrap and request past end of device.
275 */
276 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
277 ((cmd->t_task_lba + sectors) > end_lba)) {
278 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
279 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
280 return TCM_ADDRESS_OUT_OF_RANGE;
281 }
282
283 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
284 if (flags[0] & 0x10) {
285 pr_warn("WRITE SAME with ANCHOR not supported\n");
286 return TCM_INVALID_CDB_FIELD;
287 }
288 /*
289 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
290 * translated into block discard requests within backend code.
291 */
292 if (flags[0] & 0x08) {
293 if (!ops->execute_write_same_unmap)
294 return TCM_UNSUPPORTED_SCSI_OPCODE;
295
296 if (!dev->dev_attrib.emulate_tpws) {
297 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
298 " has emulate_tpws disabled\n");
299 return TCM_UNSUPPORTED_SCSI_OPCODE;
300 }
301 cmd->execute_cmd = ops->execute_write_same_unmap;
302 return 0;
303 }
304 if (!ops->execute_write_same)
305 return TCM_UNSUPPORTED_SCSI_OPCODE;
306
307 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
308 if (ret)
309 return ret;
310
311 cmd->execute_cmd = ops->execute_write_same;
312 return 0;
313 }
314
315 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
316 {
317 unsigned char *buf, *addr;
318 struct scatterlist *sg;
319 unsigned int offset;
320 sense_reason_t ret = TCM_NO_SENSE;
321 int i, count;
322 /*
323 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
324 *
325 * 1) read the specified logical block(s);
326 * 2) transfer logical blocks from the data-out buffer;
327 * 3) XOR the logical blocks transferred from the data-out buffer with
328 * the logical blocks read, storing the resulting XOR data in a buffer;
329 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
330 * blocks transferred from the data-out buffer; and
331 * 5) transfer the resulting XOR data to the data-in buffer.
332 */
333 buf = kmalloc(cmd->data_length, GFP_KERNEL);
334 if (!buf) {
335 pr_err("Unable to allocate xor_callback buf\n");
336 return TCM_OUT_OF_RESOURCES;
337 }
338 /*
339 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
340 * into the locally allocated *buf
341 */
342 sg_copy_to_buffer(cmd->t_data_sg,
343 cmd->t_data_nents,
344 buf,
345 cmd->data_length);
346
347 /*
348 * Now perform the XOR against the BIDI read memory located at
349 * cmd->t_mem_bidi_list
350 */
351
352 offset = 0;
353 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
354 addr = kmap_atomic(sg_page(sg));
355 if (!addr) {
356 ret = TCM_OUT_OF_RESOURCES;
357 goto out;
358 }
359
360 for (i = 0; i < sg->length; i++)
361 *(addr + sg->offset + i) ^= *(buf + offset + i);
362
363 offset += sg->length;
364 kunmap_atomic(addr);
365 }
366
367 out:
368 kfree(buf);
369 return ret;
370 }
371
372 static sense_reason_t
373 sbc_execute_rw(struct se_cmd *cmd)
374 {
375 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
376 cmd->data_direction);
377 }
378
379 static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
380 {
381 struct se_device *dev = cmd->se_dev;
382
383 /*
384 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
385 * within target_complete_ok_work() if the command was successfully
386 * sent to the backend driver.
387 */
388 spin_lock_irq(&cmd->t_state_lock);
389 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
390 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
391 spin_unlock_irq(&cmd->t_state_lock);
392
393 /*
394 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
395 * before the original READ I/O submission.
396 */
397 up(&dev->caw_sem);
398
399 return TCM_NO_SENSE;
400 }
401
402 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
403 {
404 struct se_device *dev = cmd->se_dev;
405 struct scatterlist *write_sg = NULL, *sg;
406 unsigned char *buf = NULL, *addr;
407 struct sg_mapping_iter m;
408 unsigned int offset = 0, len;
409 unsigned int nlbas = cmd->t_task_nolb;
410 unsigned int block_size = dev->dev_attrib.block_size;
411 unsigned int compare_len = (nlbas * block_size);
412 sense_reason_t ret = TCM_NO_SENSE;
413 int rc, i;
414
415 /*
416 * Handle early failure in transport_generic_request_failure(),
417 * which will not have taken ->caw_mutex yet..
418 */
419 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
420 return TCM_NO_SENSE;
421 /*
422 * Immediately exit + release dev->caw_sem if command has already
423 * been failed with a non-zero SCSI status.
424 */
425 if (cmd->scsi_status) {
426 pr_err("compare_and_write_callback: non zero scsi_status:"
427 " 0x%02x\n", cmd->scsi_status);
428 goto out;
429 }
430
431 buf = kzalloc(cmd->data_length, GFP_KERNEL);
432 if (!buf) {
433 pr_err("Unable to allocate compare_and_write buf\n");
434 ret = TCM_OUT_OF_RESOURCES;
435 goto out;
436 }
437
438 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
439 GFP_KERNEL);
440 if (!write_sg) {
441 pr_err("Unable to allocate compare_and_write sg\n");
442 ret = TCM_OUT_OF_RESOURCES;
443 goto out;
444 }
445 sg_init_table(write_sg, cmd->t_data_nents);
446 /*
447 * Setup verify and write data payloads from total NumberLBAs.
448 */
449 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
450 cmd->data_length);
451 if (!rc) {
452 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
453 ret = TCM_OUT_OF_RESOURCES;
454 goto out;
455 }
456 /*
457 * Compare against SCSI READ payload against verify payload
458 */
459 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
460 addr = (unsigned char *)kmap_atomic(sg_page(sg));
461 if (!addr) {
462 ret = TCM_OUT_OF_RESOURCES;
463 goto out;
464 }
465
466 len = min(sg->length, compare_len);
467
468 if (memcmp(addr, buf + offset, len)) {
469 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
470 addr, buf + offset);
471 kunmap_atomic(addr);
472 goto miscompare;
473 }
474 kunmap_atomic(addr);
475
476 offset += len;
477 compare_len -= len;
478 if (!compare_len)
479 break;
480 }
481
482 i = 0;
483 len = cmd->t_task_nolb * block_size;
484 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
485 /*
486 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
487 */
488 while (len) {
489 sg_miter_next(&m);
490
491 if (block_size < PAGE_SIZE) {
492 sg_set_page(&write_sg[i], m.page, block_size,
493 block_size);
494 } else {
495 sg_miter_next(&m);
496 sg_set_page(&write_sg[i], m.page, block_size,
497 0);
498 }
499 len -= block_size;
500 i++;
501 }
502 sg_miter_stop(&m);
503 /*
504 * Save the original SGL + nents values before updating to new
505 * assignments, to be released in transport_free_pages() ->
506 * transport_reset_sgl_orig()
507 */
508 cmd->t_data_sg_orig = cmd->t_data_sg;
509 cmd->t_data_sg = write_sg;
510 cmd->t_data_nents_orig = cmd->t_data_nents;
511 cmd->t_data_nents = 1;
512
513 cmd->sam_task_attr = TCM_HEAD_TAG;
514 cmd->transport_complete_callback = compare_and_write_post;
515 /*
516 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
517 * for submitting the adjusted SGL to write instance user-data.
518 */
519 cmd->execute_cmd = sbc_execute_rw;
520
521 spin_lock_irq(&cmd->t_state_lock);
522 cmd->t_state = TRANSPORT_PROCESSING;
523 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
524 spin_unlock_irq(&cmd->t_state_lock);
525
526 __target_execute_cmd(cmd);
527
528 kfree(buf);
529 return ret;
530
531 miscompare:
532 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
533 dev->transport->name);
534 ret = TCM_MISCOMPARE_VERIFY;
535 out:
536 /*
537 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
538 * sbc_compare_and_write() before the original READ I/O submission.
539 */
540 up(&dev->caw_sem);
541 kfree(write_sg);
542 kfree(buf);
543 return ret;
544 }
545
546 static sense_reason_t
547 sbc_compare_and_write(struct se_cmd *cmd)
548 {
549 struct se_device *dev = cmd->se_dev;
550 sense_reason_t ret;
551 int rc;
552 /*
553 * Submit the READ first for COMPARE_AND_WRITE to perform the
554 * comparision using SGLs at cmd->t_bidi_data_sg..
555 */
556 rc = down_interruptible(&dev->caw_sem);
557 if ((rc != 0) || signal_pending(current)) {
558 cmd->transport_complete_callback = NULL;
559 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
560 }
561 /*
562 * Reset cmd->data_length to individual block_size in order to not
563 * confuse backend drivers that depend on this value matching the
564 * size of the I/O being submitted.
565 */
566 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
567
568 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
569 DMA_FROM_DEVICE);
570 if (ret) {
571 cmd->transport_complete_callback = NULL;
572 up(&dev->caw_sem);
573 return ret;
574 }
575 /*
576 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
577 * upon MISCOMPARE, or in compare_and_write_done() upon completion
578 * of WRITE instance user-data.
579 */
580 return TCM_NO_SENSE;
581 }
582
583 static int
584 sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
585 bool is_write, struct se_cmd *cmd)
586 {
587 if (is_write) {
588 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS :
589 TARGET_PROT_DOUT_INSERT;
590 switch (protect) {
591 case 0x0:
592 case 0x3:
593 cmd->prot_checks = 0;
594 break;
595 case 0x1:
596 case 0x5:
597 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
598 if (prot_type == TARGET_DIF_TYPE1_PROT)
599 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
600 break;
601 case 0x2:
602 if (prot_type == TARGET_DIF_TYPE1_PROT)
603 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
604 break;
605 case 0x4:
606 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
607 break;
608 default:
609 pr_err("Unsupported protect field %d\n", protect);
610 return -EINVAL;
611 }
612 } else {
613 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS :
614 TARGET_PROT_DIN_STRIP;
615 switch (protect) {
616 case 0x0:
617 case 0x1:
618 case 0x5:
619 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
620 if (prot_type == TARGET_DIF_TYPE1_PROT)
621 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
622 break;
623 case 0x2:
624 if (prot_type == TARGET_DIF_TYPE1_PROT)
625 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
626 break;
627 case 0x3:
628 cmd->prot_checks = 0;
629 break;
630 case 0x4:
631 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
632 break;
633 default:
634 pr_err("Unsupported protect field %d\n", protect);
635 return -EINVAL;
636 }
637 }
638
639 return 0;
640 }
641
642 static sense_reason_t
643 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
644 u32 sectors, bool is_write)
645 {
646 u8 protect = cdb[1] >> 5;
647
648 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
649 if (protect && !dev->dev_attrib.pi_prot_type) {
650 pr_err("CDB contains protect bit, but device does not"
651 " advertise PROTECT=1 feature bit\n");
652 return TCM_INVALID_CDB_FIELD;
653 }
654 if (cmd->prot_pto)
655 return TCM_NO_SENSE;
656 }
657
658 switch (dev->dev_attrib.pi_prot_type) {
659 case TARGET_DIF_TYPE3_PROT:
660 cmd->reftag_seed = 0xffffffff;
661 break;
662 case TARGET_DIF_TYPE2_PROT:
663 if (protect)
664 return TCM_INVALID_CDB_FIELD;
665
666 cmd->reftag_seed = cmd->t_task_lba;
667 break;
668 case TARGET_DIF_TYPE1_PROT:
669 cmd->reftag_seed = cmd->t_task_lba;
670 break;
671 case TARGET_DIF_TYPE0_PROT:
672 default:
673 return TCM_NO_SENSE;
674 }
675
676 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
677 is_write, cmd))
678 return TCM_INVALID_CDB_FIELD;
679
680 cmd->prot_type = dev->dev_attrib.pi_prot_type;
681 cmd->prot_length = dev->prot_length * sectors;
682
683 /**
684 * In case protection information exists over the wire
685 * we modify command data length to describe pure data.
686 * The actual transfer length is data length + protection
687 * length
688 **/
689 if (protect)
690 cmd->data_length = sectors * dev->dev_attrib.block_size;
691
692 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
693 "prot_op=%d prot_checks=%d\n",
694 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
695 cmd->prot_op, cmd->prot_checks);
696
697 return TCM_NO_SENSE;
698 }
699
700 static int
701 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
702 {
703 if (cdb[1] & 0x10) {
704 if (!dev->dev_attrib.emulate_dpo) {
705 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
706 " does not advertise support for DPO\n", cdb[0]);
707 return -EINVAL;
708 }
709 }
710 if (cdb[1] & 0x8) {
711 if (!dev->dev_attrib.emulate_fua_write || !se_dev_check_wce(dev)) {
712 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
713 " does not advertise support for FUA write\n",
714 cdb[0]);
715 return -EINVAL;
716 }
717 cmd->se_cmd_flags |= SCF_FUA;
718 }
719 return 0;
720 }
721
722 sense_reason_t
723 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
724 {
725 struct se_device *dev = cmd->se_dev;
726 unsigned char *cdb = cmd->t_task_cdb;
727 unsigned int size;
728 u32 sectors = 0;
729 sense_reason_t ret;
730
731 switch (cdb[0]) {
732 case READ_6:
733 sectors = transport_get_sectors_6(cdb);
734 cmd->t_task_lba = transport_lba_21(cdb);
735 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
736 cmd->execute_rw = ops->execute_rw;
737 cmd->execute_cmd = sbc_execute_rw;
738 break;
739 case READ_10:
740 sectors = transport_get_sectors_10(cdb);
741 cmd->t_task_lba = transport_lba_32(cdb);
742
743 if (sbc_check_dpofua(dev, cmd, cdb))
744 return TCM_INVALID_CDB_FIELD;
745
746 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
747 if (ret)
748 return ret;
749
750 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
751 cmd->execute_rw = ops->execute_rw;
752 cmd->execute_cmd = sbc_execute_rw;
753 break;
754 case READ_12:
755 sectors = transport_get_sectors_12(cdb);
756 cmd->t_task_lba = transport_lba_32(cdb);
757
758 if (sbc_check_dpofua(dev, cmd, cdb))
759 return TCM_INVALID_CDB_FIELD;
760
761 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
762 if (ret)
763 return ret;
764
765 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
766 cmd->execute_rw = ops->execute_rw;
767 cmd->execute_cmd = sbc_execute_rw;
768 break;
769 case READ_16:
770 sectors = transport_get_sectors_16(cdb);
771 cmd->t_task_lba = transport_lba_64(cdb);
772
773 if (sbc_check_dpofua(dev, cmd, cdb))
774 return TCM_INVALID_CDB_FIELD;
775
776 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
777 if (ret)
778 return ret;
779
780 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
781 cmd->execute_rw = ops->execute_rw;
782 cmd->execute_cmd = sbc_execute_rw;
783 break;
784 case WRITE_6:
785 sectors = transport_get_sectors_6(cdb);
786 cmd->t_task_lba = transport_lba_21(cdb);
787 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
788 cmd->execute_rw = ops->execute_rw;
789 cmd->execute_cmd = sbc_execute_rw;
790 break;
791 case WRITE_10:
792 case WRITE_VERIFY:
793 sectors = transport_get_sectors_10(cdb);
794 cmd->t_task_lba = transport_lba_32(cdb);
795
796 if (sbc_check_dpofua(dev, cmd, cdb))
797 return TCM_INVALID_CDB_FIELD;
798
799 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
800 if (ret)
801 return ret;
802
803 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
804 cmd->execute_rw = ops->execute_rw;
805 cmd->execute_cmd = sbc_execute_rw;
806 break;
807 case WRITE_12:
808 sectors = transport_get_sectors_12(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, sectors, true);
815 if (ret)
816 return ret;
817
818 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
819 cmd->execute_rw = ops->execute_rw;
820 cmd->execute_cmd = sbc_execute_rw;
821 break;
822 case WRITE_16:
823 sectors = transport_get_sectors_16(cdb);
824 cmd->t_task_lba = transport_lba_64(cdb);
825
826 if (sbc_check_dpofua(dev, cmd, cdb))
827 return TCM_INVALID_CDB_FIELD;
828
829 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
830 if (ret)
831 return ret;
832
833 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
834 cmd->execute_rw = ops->execute_rw;
835 cmd->execute_cmd = sbc_execute_rw;
836 break;
837 case XDWRITEREAD_10:
838 if (cmd->data_direction != DMA_TO_DEVICE ||
839 !(cmd->se_cmd_flags & SCF_BIDI))
840 return TCM_INVALID_CDB_FIELD;
841 sectors = transport_get_sectors_10(cdb);
842
843 if (sbc_check_dpofua(dev, cmd, cdb))
844 return TCM_INVALID_CDB_FIELD;
845
846 cmd->t_task_lba = transport_lba_32(cdb);
847 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
848
849 /*
850 * Setup BIDI XOR callback to be run after I/O completion.
851 */
852 cmd->execute_rw = ops->execute_rw;
853 cmd->execute_cmd = sbc_execute_rw;
854 cmd->transport_complete_callback = &xdreadwrite_callback;
855 break;
856 case VARIABLE_LENGTH_CMD:
857 {
858 u16 service_action = get_unaligned_be16(&cdb[8]);
859 switch (service_action) {
860 case XDWRITEREAD_32:
861 sectors = transport_get_sectors_32(cdb);
862
863 if (sbc_check_dpofua(dev, cmd, cdb))
864 return TCM_INVALID_CDB_FIELD;
865 /*
866 * Use WRITE_32 and READ_32 opcodes for the emulated
867 * XDWRITE_READ_32 logic.
868 */
869 cmd->t_task_lba = transport_lba_64_ext(cdb);
870 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
871
872 /*
873 * Setup BIDI XOR callback to be run during after I/O
874 * completion.
875 */
876 cmd->execute_rw = ops->execute_rw;
877 cmd->execute_cmd = sbc_execute_rw;
878 cmd->transport_complete_callback = &xdreadwrite_callback;
879 break;
880 case WRITE_SAME_32:
881 sectors = transport_get_sectors_32(cdb);
882 if (!sectors) {
883 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
884 " supported\n");
885 return TCM_INVALID_CDB_FIELD;
886 }
887
888 size = sbc_get_size(cmd, 1);
889 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
890
891 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
892 if (ret)
893 return ret;
894 break;
895 default:
896 pr_err("VARIABLE_LENGTH_CMD service action"
897 " 0x%04x not supported\n", service_action);
898 return TCM_UNSUPPORTED_SCSI_OPCODE;
899 }
900 break;
901 }
902 case COMPARE_AND_WRITE:
903 sectors = cdb[13];
904 /*
905 * Currently enforce COMPARE_AND_WRITE for a single sector
906 */
907 if (sectors > 1) {
908 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
909 " than 1\n", sectors);
910 return TCM_INVALID_CDB_FIELD;
911 }
912 /*
913 * Double size because we have two buffers, note that
914 * zero is not an error..
915 */
916 size = 2 * sbc_get_size(cmd, sectors);
917 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
918 cmd->t_task_nolb = sectors;
919 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
920 cmd->execute_rw = ops->execute_rw;
921 cmd->execute_cmd = sbc_compare_and_write;
922 cmd->transport_complete_callback = compare_and_write_callback;
923 break;
924 case READ_CAPACITY:
925 size = READ_CAP_LEN;
926 cmd->execute_cmd = sbc_emulate_readcapacity;
927 break;
928 case SERVICE_ACTION_IN_16:
929 switch (cmd->t_task_cdb[1] & 0x1f) {
930 case SAI_READ_CAPACITY_16:
931 cmd->execute_cmd = sbc_emulate_readcapacity_16;
932 break;
933 case SAI_REPORT_REFERRALS:
934 cmd->execute_cmd = target_emulate_report_referrals;
935 break;
936 default:
937 pr_err("Unsupported SA: 0x%02x\n",
938 cmd->t_task_cdb[1] & 0x1f);
939 return TCM_INVALID_CDB_FIELD;
940 }
941 size = (cdb[10] << 24) | (cdb[11] << 16) |
942 (cdb[12] << 8) | cdb[13];
943 break;
944 case SYNCHRONIZE_CACHE:
945 case SYNCHRONIZE_CACHE_16:
946 if (cdb[0] == SYNCHRONIZE_CACHE) {
947 sectors = transport_get_sectors_10(cdb);
948 cmd->t_task_lba = transport_lba_32(cdb);
949 } else {
950 sectors = transport_get_sectors_16(cdb);
951 cmd->t_task_lba = transport_lba_64(cdb);
952 }
953 if (ops->execute_sync_cache) {
954 cmd->execute_cmd = ops->execute_sync_cache;
955 goto check_lba;
956 }
957 size = 0;
958 cmd->execute_cmd = sbc_emulate_noop;
959 break;
960 case UNMAP:
961 if (!ops->execute_unmap)
962 return TCM_UNSUPPORTED_SCSI_OPCODE;
963
964 if (!dev->dev_attrib.emulate_tpu) {
965 pr_err("Got UNMAP, but backend device has"
966 " emulate_tpu disabled\n");
967 return TCM_UNSUPPORTED_SCSI_OPCODE;
968 }
969 size = get_unaligned_be16(&cdb[7]);
970 cmd->execute_cmd = ops->execute_unmap;
971 break;
972 case WRITE_SAME_16:
973 sectors = transport_get_sectors_16(cdb);
974 if (!sectors) {
975 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not 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[2]);
981
982 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
983 if (ret)
984 return ret;
985 break;
986 case WRITE_SAME:
987 sectors = transport_get_sectors_10(cdb);
988 if (!sectors) {
989 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
990 return TCM_INVALID_CDB_FIELD;
991 }
992
993 size = sbc_get_size(cmd, 1);
994 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
995
996 /*
997 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
998 * of byte 1 bit 3 UNMAP instead of original reserved field
999 */
1000 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1001 if (ret)
1002 return ret;
1003 break;
1004 case VERIFY:
1005 size = 0;
1006 sectors = transport_get_sectors_10(cdb);
1007 cmd->t_task_lba = transport_lba_32(cdb);
1008 cmd->execute_cmd = sbc_emulate_noop;
1009 goto check_lba;
1010 case REZERO_UNIT:
1011 case SEEK_6:
1012 case SEEK_10:
1013 /*
1014 * There are still clients out there which use these old SCSI-2
1015 * commands. This mainly happens when running VMs with legacy
1016 * guest systems, connected via SCSI command pass-through to
1017 * iSCSI targets. Make them happy and return status GOOD.
1018 */
1019 size = 0;
1020 cmd->execute_cmd = sbc_emulate_noop;
1021 break;
1022 default:
1023 ret = spc_parse_cdb(cmd, &size);
1024 if (ret)
1025 return ret;
1026 }
1027
1028 /* reject any command that we don't have a handler for */
1029 if (!cmd->execute_cmd)
1030 return TCM_UNSUPPORTED_SCSI_OPCODE;
1031
1032 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1033 unsigned long long end_lba;
1034 check_lba:
1035 end_lba = dev->transport->get_blocks(dev) + 1;
1036 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1037 ((cmd->t_task_lba + sectors) > end_lba)) {
1038 pr_err("cmd exceeds last lba %llu "
1039 "(lba %llu, sectors %u)\n",
1040 end_lba, cmd->t_task_lba, sectors);
1041 return TCM_ADDRESS_OUT_OF_RANGE;
1042 }
1043
1044 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1045 size = sbc_get_size(cmd, sectors);
1046 }
1047
1048 return target_cmd_size_check(cmd, size);
1049 }
1050 EXPORT_SYMBOL(sbc_parse_cdb);
1051
1052 u32 sbc_get_device_type(struct se_device *dev)
1053 {
1054 return TYPE_DISK;
1055 }
1056 EXPORT_SYMBOL(sbc_get_device_type);
1057
1058 sense_reason_t
1059 sbc_execute_unmap(struct se_cmd *cmd,
1060 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
1061 sector_t, sector_t),
1062 void *priv)
1063 {
1064 struct se_device *dev = cmd->se_dev;
1065 unsigned char *buf, *ptr = NULL;
1066 sector_t lba;
1067 int size;
1068 u32 range;
1069 sense_reason_t ret = 0;
1070 int dl, bd_dl;
1071
1072 /* We never set ANC_SUP */
1073 if (cmd->t_task_cdb[1])
1074 return TCM_INVALID_CDB_FIELD;
1075
1076 if (cmd->data_length == 0) {
1077 target_complete_cmd(cmd, SAM_STAT_GOOD);
1078 return 0;
1079 }
1080
1081 if (cmd->data_length < 8) {
1082 pr_warn("UNMAP parameter list length %u too small\n",
1083 cmd->data_length);
1084 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1085 }
1086
1087 buf = transport_kmap_data_sg(cmd);
1088 if (!buf)
1089 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1090
1091 dl = get_unaligned_be16(&buf[0]);
1092 bd_dl = get_unaligned_be16(&buf[2]);
1093
1094 size = cmd->data_length - 8;
1095 if (bd_dl > size)
1096 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1097 cmd->data_length, bd_dl);
1098 else
1099 size = bd_dl;
1100
1101 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1102 ret = TCM_INVALID_PARAMETER_LIST;
1103 goto err;
1104 }
1105
1106 /* First UNMAP block descriptor starts at 8 byte offset */
1107 ptr = &buf[8];
1108 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1109 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1110
1111 while (size >= 16) {
1112 lba = get_unaligned_be64(&ptr[0]);
1113 range = get_unaligned_be32(&ptr[8]);
1114 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1115 (unsigned long long)lba, range);
1116
1117 if (range > dev->dev_attrib.max_unmap_lba_count) {
1118 ret = TCM_INVALID_PARAMETER_LIST;
1119 goto err;
1120 }
1121
1122 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1123 ret = TCM_ADDRESS_OUT_OF_RANGE;
1124 goto err;
1125 }
1126
1127 ret = do_unmap_fn(cmd, priv, lba, range);
1128 if (ret)
1129 goto err;
1130
1131 ptr += 16;
1132 size -= 16;
1133 }
1134
1135 err:
1136 transport_kunmap_data_sg(cmd);
1137 if (!ret)
1138 target_complete_cmd(cmd, GOOD);
1139 return ret;
1140 }
1141 EXPORT_SYMBOL(sbc_execute_unmap);
1142
1143 void
1144 sbc_dif_generate(struct se_cmd *cmd)
1145 {
1146 struct se_device *dev = cmd->se_dev;
1147 struct se_dif_v1_tuple *sdt;
1148 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1149 sector_t sector = cmd->t_task_lba;
1150 void *daddr, *paddr;
1151 int i, j, offset = 0;
1152
1153 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1154 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1155 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1156
1157 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1158
1159 if (offset >= psg->length) {
1160 kunmap_atomic(paddr);
1161 psg = sg_next(psg);
1162 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1163 offset = 0;
1164 }
1165
1166 sdt = paddr + offset;
1167 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1168 dev->dev_attrib.block_size));
1169 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
1170 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1171 sdt->app_tag = 0;
1172
1173 pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x"
1174 " app_tag: 0x%04x ref_tag: %u\n",
1175 (unsigned long long)sector, sdt->guard_tag,
1176 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1177
1178 sector++;
1179 offset += sizeof(struct se_dif_v1_tuple);
1180 }
1181
1182 kunmap_atomic(paddr);
1183 kunmap_atomic(daddr);
1184 }
1185 }
1186
1187 static sense_reason_t
1188 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
1189 const void *p, sector_t sector, unsigned int ei_lba)
1190 {
1191 int block_size = dev->dev_attrib.block_size;
1192 __be16 csum;
1193
1194 csum = cpu_to_be16(crc_t10dif(p, block_size));
1195
1196 if (sdt->guard_tag != csum) {
1197 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1198 " csum 0x%04x\n", (unsigned long long)sector,
1199 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1200 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1201 }
1202
1203 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
1204 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1205 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1206 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1207 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1208 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1209 }
1210
1211 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
1212 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1213 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1214 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1215 be32_to_cpu(sdt->ref_tag), ei_lba);
1216 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1217 }
1218
1219 return 0;
1220 }
1221
1222 static void
1223 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1224 struct scatterlist *sg, int sg_off)
1225 {
1226 struct se_device *dev = cmd->se_dev;
1227 struct scatterlist *psg;
1228 void *paddr, *addr;
1229 unsigned int i, len, left;
1230 unsigned int offset = sg_off;
1231
1232 left = sectors * dev->prot_length;
1233
1234 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1235 unsigned int psg_len, copied = 0;
1236
1237 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1238 psg_len = min(left, psg->length);
1239 while (psg_len) {
1240 len = min(psg_len, sg->length - offset);
1241 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1242
1243 if (read)
1244 memcpy(paddr + copied, addr, len);
1245 else
1246 memcpy(addr, paddr + copied, len);
1247
1248 left -= len;
1249 offset += len;
1250 copied += len;
1251 psg_len -= len;
1252
1253 if (offset >= sg->length) {
1254 sg = sg_next(sg);
1255 offset = 0;
1256 }
1257 kunmap_atomic(addr);
1258 }
1259 kunmap_atomic(paddr);
1260 }
1261 }
1262
1263 sense_reason_t
1264 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1265 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1266 {
1267 struct se_device *dev = cmd->se_dev;
1268 struct se_dif_v1_tuple *sdt;
1269 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1270 sector_t sector = start;
1271 void *daddr, *paddr;
1272 int i, j, offset = 0;
1273 sense_reason_t rc;
1274
1275 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1276 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1277 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1278
1279 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1280
1281 if (offset >= psg->length) {
1282 kunmap_atomic(paddr);
1283 psg = sg_next(psg);
1284 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1285 offset = 0;
1286 }
1287
1288 sdt = paddr + offset;
1289
1290 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1291 " app_tag: 0x%04x ref_tag: %u\n",
1292 (unsigned long long)sector, sdt->guard_tag,
1293 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1294
1295 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1296 ei_lba);
1297 if (rc) {
1298 kunmap_atomic(paddr);
1299 kunmap_atomic(daddr);
1300 cmd->bad_sector = sector;
1301 return rc;
1302 }
1303
1304 sector++;
1305 ei_lba++;
1306 offset += sizeof(struct se_dif_v1_tuple);
1307 }
1308
1309 kunmap_atomic(paddr);
1310 kunmap_atomic(daddr);
1311 }
1312 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1313
1314 return 0;
1315 }
1316 EXPORT_SYMBOL(sbc_dif_verify_write);
1317
1318 static sense_reason_t
1319 __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1320 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1321 {
1322 struct se_device *dev = cmd->se_dev;
1323 struct se_dif_v1_tuple *sdt;
1324 struct scatterlist *dsg, *psg = sg;
1325 sector_t sector = start;
1326 void *daddr, *paddr;
1327 int i, j, offset = sg_off;
1328 sense_reason_t rc;
1329
1330 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1331 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1332 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
1333
1334 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1335
1336 if (offset >= psg->length) {
1337 kunmap_atomic(paddr);
1338 psg = sg_next(psg);
1339 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1340 offset = 0;
1341 }
1342
1343 sdt = paddr + offset;
1344
1345 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1346 " app_tag: 0x%04x ref_tag: %u\n",
1347 (unsigned long long)sector, sdt->guard_tag,
1348 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1349
1350 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1351 sector++;
1352 offset += sizeof(struct se_dif_v1_tuple);
1353 continue;
1354 }
1355
1356 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1357 ei_lba);
1358 if (rc) {
1359 kunmap_atomic(paddr);
1360 kunmap_atomic(daddr);
1361 cmd->bad_sector = sector;
1362 return rc;
1363 }
1364
1365 sector++;
1366 ei_lba++;
1367 offset += sizeof(struct se_dif_v1_tuple);
1368 }
1369
1370 kunmap_atomic(paddr);
1371 kunmap_atomic(daddr);
1372 }
1373
1374 return 0;
1375 }
1376
1377 sense_reason_t
1378 sbc_dif_read_strip(struct se_cmd *cmd)
1379 {
1380 struct se_device *dev = cmd->se_dev;
1381 u32 sectors = cmd->prot_length / dev->prot_length;
1382
1383 return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1384 cmd->t_prot_sg, 0);
1385 }
1386
1387 sense_reason_t
1388 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1389 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1390 {
1391 sense_reason_t rc;
1392
1393 rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1394 if (rc)
1395 return rc;
1396
1397 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1398 return 0;
1399 }
1400 EXPORT_SYMBOL(sbc_dif_verify_read);
Linux with added FPC-III support