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target: Perform PROTECT sanity checks for WRITE_SAME
[deliverable/linux.git] / drivers / target / target_core_sbc.c
CommitLineData
d6e0175c
CH		 1/*
2 * SCSI Block Commands (SBC) parsing and emulation.
3 *
4c76251e 4 * (c) Copyright 2002-2013 Datera, Inc.
d6e0175c
CH		 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>
41861fa8 26#include <linux/crc-t10dif.h>
d6e0175c
CH		 27#include <asm/unaligned.h>
28#include <scsi/scsi.h>
68ff9b9b 29#include <scsi/scsi_tcq.h>
d6e0175c
CH		 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"
c66094bf 37#include "target_core_alua.h"
d6e0175c 38
afd73f1b
NB		 39static sense_reason_t
40sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool);
41
de103c93
CH		 42static sense_reason_t
43sbc_emulate_readcapacity(struct se_cmd *cmd)
1fd032ee
CH		 44{
45 struct se_device *dev = cmd->se_dev;
8dc8632a 46 unsigned char *cdb = cmd->t_task_cdb;
1fd032ee 47 unsigned long long blocks_long = dev->transport->get_blocks(dev);
a50da144
PB		 48 unsigned char *rbuf;
49 unsigned char buf[8];
1fd032ee
CH		 50 u32 blocks;
51
8dc8632a
RD		 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
1fd032ee
CH		 67 if (blocks_long >= 0x00000000ffffffff)
68 blocks = 0xffffffff;
69 else
70 blocks = (u32)blocks_long;
71
1fd032ee
CH		 72 buf[0] = (blocks >> 24) & 0xff;
73 buf[1] = (blocks >> 16) & 0xff;
74 buf[2] = (blocks >> 8) & 0xff;
75 buf[3] = blocks & 0xff;
0fd97ccf
CH		 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;
1fd032ee 80
a50da144 81 rbuf = transport_kmap_data_sg(cmd);
8b4b0dcb
NB		 82 if (rbuf) {
83 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
84 transport_kunmap_data_sg(cmd);
85 }
1fd032ee 86
2426bd45 87 target_complete_cmd_with_length(cmd, GOOD, 8);
1fd032ee
CH		 88 return 0;
89}
90
de103c93
CH		 91static sense_reason_t
92sbc_emulate_readcapacity_16(struct se_cmd *cmd)
1fd032ee
CH		 93{
94 struct se_device *dev = cmd->se_dev;
2d335983 95 struct se_session *sess = cmd->se_sess;
a50da144
PB		 96 unsigned char *rbuf;
97 unsigned char buf[32];
1fd032ee
CH		 98 unsigned long long blocks = dev->transport->get_blocks(dev);
99
a50da144 100 memset(buf, 0, sizeof(buf));
1fd032ee
CH		 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;
0fd97ccf
CH		 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;
56dac14c
NB		 113 /*
114 * Set P_TYPE and PROT_EN bits for DIF support
115 */
2d335983
NB		 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 }
7f7caf6a
AG		 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
1fd032ee
CH		 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 */
0fd97ccf 134 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
7f7caf6a 135 buf[14] |= 0x80;
1fd032ee 136
a50da144 137 rbuf = transport_kmap_data_sg(cmd);
8b4b0dcb
NB		 138 if (rbuf) {
139 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
140 transport_kunmap_data_sg(cmd);
141 }
1fd032ee 142
2426bd45 143 target_complete_cmd_with_length(cmd, GOOD, 32);
1fd032ee
CH		 144 return 0;
145}
146
972b29c8 147sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
1fd032ee 148{
1fd032ee 149 u32 num_blocks;
1fd032ee
CH		 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 */
6f974e8c
CH		 162 if (num_blocks)
163 return num_blocks;
1fd032ee 164
6f974e8c
CH		 165 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
166 cmd->t_task_lba + 1;
1fd032ee 167}
972b29c8 168EXPORT_SYMBOL(sbc_get_write_same_sectors);
1fd032ee 169
de103c93 170static sense_reason_t
1920ed61 171sbc_emulate_noop(struct se_cmd *cmd)
1a1ff38c
BK		 172{
173 target_complete_cmd(cmd, GOOD);
174 return 0;
175}
176
d6e0175c
CH		 177static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
178{
0fd97ccf 179 return cmd->se_dev->dev_attrib.block_size * sectors;
d6e0175c
CH		 180}
181
d6e0175c
CH		 182static 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
195static inline u32 transport_get_sectors_10(unsigned char *cdb)
196{
197 return (u32)(cdb[7] << 8) + cdb[8];
198}
199
200static 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
205static 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 */
214static 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
221static inline u32 transport_lba_21(unsigned char *cdb)
222{
223 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
224}
225
226static inline u32 transport_lba_32(unsigned char *cdb)
227{
228 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
229}
230
231static 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 */
244static 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
cd063bef
NB		 254static sense_reason_t
255sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
d6e0175c 256{
8e575c50
NB		 257 struct se_device *dev = cmd->se_dev;
258 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
972b29c8 259 unsigned int sectors = sbc_get_write_same_sectors(cmd);
afd73f1b 260 sense_reason_t ret;
773cbaf7 261
d6e0175c
CH		 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");
cd063bef 266 return TCM_UNSUPPORTED_SCSI_OPCODE;
d6e0175c 267 }
773cbaf7
NB		 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 }
8e575c50
NB		 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
5cb770bf
RD		 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 }
d6e0175c 288 /*
cd063bef
NB		 289 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
290 * translated into block discard requests within backend code.
d6e0175c 291 */
cd063bef
NB		 292 if (flags[0] & 0x08) {
293 if (!ops->execute_write_same_unmap)
294 return TCM_UNSUPPORTED_SCSI_OPCODE;
295
296 cmd->execute_cmd = ops->execute_write_same_unmap;
297 return 0;
d6e0175c 298 }
cd063bef
NB		 299 if (!ops->execute_write_same)
300 return TCM_UNSUPPORTED_SCSI_OPCODE;
d6e0175c 301
afd73f1b
NB		 302 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
303 if (ret)
304 return ret;
305
cd063bef 306 cmd->execute_cmd = ops->execute_write_same;
d6e0175c
CH		 307 return 0;
308}
309
a6b0133c 310static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
d6e0175c
CH		 311{
312 unsigned char *buf, *addr;
313 struct scatterlist *sg;
314 unsigned int offset;
a6b0133c
NB		 315 sense_reason_t ret = TCM_NO_SENSE;
316 int i, count;
d6e0175c
CH		 317 /*
318 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
319 *
320 * 1) read the specified logical block(s);
321 * 2) transfer logical blocks from the data-out buffer;
322 * 3) XOR the logical blocks transferred from the data-out buffer with
323 * the logical blocks read, storing the resulting XOR data in a buffer;
324 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
325 * blocks transferred from the data-out buffer; and
326 * 5) transfer the resulting XOR data to the data-in buffer.
327 */
328 buf = kmalloc(cmd->data_length, GFP_KERNEL);
329 if (!buf) {
330 pr_err("Unable to allocate xor_callback buf\n");
a6b0133c 331 return TCM_OUT_OF_RESOURCES;
d6e0175c
CH		 332 }
333 /*
334 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
335 * into the locally allocated *buf
336 */
337 sg_copy_to_buffer(cmd->t_data_sg,
338 cmd->t_data_nents,
339 buf,
340 cmd->data_length);
341
342 /*
343 * Now perform the XOR against the BIDI read memory located at
344 * cmd->t_mem_bidi_list
345 */
346
347 offset = 0;
348 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
349 addr = kmap_atomic(sg_page(sg));
a6b0133c
NB		 350 if (!addr) {
351 ret = TCM_OUT_OF_RESOURCES;
d6e0175c 352 goto out;
a6b0133c 353 }
d6e0175c
CH		 354
355 for (i = 0; i < sg->length; i++)
356 *(addr + sg->offset + i) ^= *(buf + offset + i);
357
358 offset += sg->length;
359 kunmap_atomic(addr);
360 }
361
362out:
363 kfree(buf);
a6b0133c 364 return ret;
d6e0175c
CH		 365}
366
a82a9538
NB		 367static sense_reason_t
368sbc_execute_rw(struct se_cmd *cmd)
369{
370 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
371 cmd->data_direction);
372}
373
68ff9b9b
NB		 374static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
375{
376 struct se_device *dev = cmd->se_dev;
377
d8855c15
NB		 378 /*
379 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
380 * within target_complete_ok_work() if the command was successfully
381 * sent to the backend driver.
382 */
383 spin_lock_irq(&cmd->t_state_lock);
384 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
385 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
386 spin_unlock_irq(&cmd->t_state_lock);
387
68ff9b9b
NB		 388 /*
389 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
390 * before the original READ I/O submission.
391 */
392 up(&dev->caw_sem);
393
394 return TCM_NO_SENSE;
395}
396
397static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
398{
399 struct se_device *dev = cmd->se_dev;
400 struct scatterlist *write_sg = NULL, *sg;
db60df88 401 unsigned char *buf = NULL, *addr;
68ff9b9b
NB		 402 struct sg_mapping_iter m;
403 unsigned int offset = 0, len;
404 unsigned int nlbas = cmd->t_task_nolb;
405 unsigned int block_size = dev->dev_attrib.block_size;
406 unsigned int compare_len = (nlbas * block_size);
407 sense_reason_t ret = TCM_NO_SENSE;
408 int rc, i;
409
cf6d1f09
NB		 410 /*
411 * Handle early failure in transport_generic_request_failure(),
412 * which will not have taken ->caw_mutex yet..
413 */
414 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
415 return TCM_NO_SENSE;
db60df88
NB		 416 /*
417 * Immediately exit + release dev->caw_sem if command has already
418 * been failed with a non-zero SCSI status.
419 */
420 if (cmd->scsi_status) {
421 pr_err("compare_and_write_callback: non zero scsi_status:"
422 " 0x%02x\n", cmd->scsi_status);
423 goto out;
424 }
cf6d1f09 425
68ff9b9b
NB		 426 buf = kzalloc(cmd->data_length, GFP_KERNEL);
427 if (!buf) {
428 pr_err("Unable to allocate compare_and_write buf\n");
a2890087
NB		 429 ret = TCM_OUT_OF_RESOURCES;
430 goto out;
68ff9b9b
NB		 431 }
432
a1e1774c 433 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
68ff9b9b
NB		 434 GFP_KERNEL);
435 if (!write_sg) {
436 pr_err("Unable to allocate compare_and_write sg\n");
437 ret = TCM_OUT_OF_RESOURCES;
438 goto out;
439 }
a1e1774c 440 sg_init_table(write_sg, cmd->t_data_nents);
68ff9b9b
NB		 441 /*
442 * Setup verify and write data payloads from total NumberLBAs.
443 */
444 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
445 cmd->data_length);
446 if (!rc) {
447 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
448 ret = TCM_OUT_OF_RESOURCES;
449 goto out;
450 }
451 /*
452 * Compare against SCSI READ payload against verify payload
453 */
454 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
455 addr = (unsigned char *)kmap_atomic(sg_page(sg));
456 if (!addr) {
457 ret = TCM_OUT_OF_RESOURCES;
458 goto out;
459 }
460
461 len = min(sg->length, compare_len);
462
463 if (memcmp(addr, buf + offset, len)) {
464 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
465 addr, buf + offset);
466 kunmap_atomic(addr);
467 goto miscompare;
468 }
469 kunmap_atomic(addr);
470
471 offset += len;
472 compare_len -= len;
473 if (!compare_len)
474 break;
475 }
476
477 i = 0;
478 len = cmd->t_task_nolb * block_size;
479 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
480 /*
481 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
482 */
483 while (len) {
484 sg_miter_next(&m);
485
486 if (block_size < PAGE_SIZE) {
487 sg_set_page(&write_sg[i], m.page, block_size,
488 block_size);
489 } else {
490 sg_miter_next(&m);
491 sg_set_page(&write_sg[i], m.page, block_size,
492 0);
493 }
494 len -= block_size;
495 i++;
496 }
497 sg_miter_stop(&m);
498 /*
499 * Save the original SGL + nents values before updating to new
500 * assignments, to be released in transport_free_pages() ->
501 * transport_reset_sgl_orig()
502 */
503 cmd->t_data_sg_orig = cmd->t_data_sg;
504 cmd->t_data_sg = write_sg;
505 cmd->t_data_nents_orig = cmd->t_data_nents;
506 cmd->t_data_nents = 1;
507
68d81f40 508 cmd->sam_task_attr = TCM_HEAD_TAG;
68ff9b9b
NB		 509 cmd->transport_complete_callback = compare_and_write_post;
510 /*
511 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
512 * for submitting the adjusted SGL to write instance user-data.
513 */
514 cmd->execute_cmd = sbc_execute_rw;
515
516 spin_lock_irq(&cmd->t_state_lock);
517 cmd->t_state = TRANSPORT_PROCESSING;
518 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
519 spin_unlock_irq(&cmd->t_state_lock);
520
521 __target_execute_cmd(cmd);
522
523 kfree(buf);
524 return ret;
525
526miscompare:
527 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
528 dev->transport->name);
529 ret = TCM_MISCOMPARE_VERIFY;
530out:
531 /*
532 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
533 * sbc_compare_and_write() before the original READ I/O submission.
534 */
535 up(&dev->caw_sem);
536 kfree(write_sg);
537 kfree(buf);
538 return ret;
539}
540
541static sense_reason_t
542sbc_compare_and_write(struct se_cmd *cmd)
543{
544 struct se_device *dev = cmd->se_dev;
545 sense_reason_t ret;
546 int rc;
547 /*
548 * Submit the READ first for COMPARE_AND_WRITE to perform the
549 * comparision using SGLs at cmd->t_bidi_data_sg..
550 */
551 rc = down_interruptible(&dev->caw_sem);
552 if ((rc != 0) || signal_pending(current)) {
553 cmd->transport_complete_callback = NULL;
554 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
555 }
b7191253
NB		 556 /*
557 * Reset cmd->data_length to individual block_size in order to not
558 * confuse backend drivers that depend on this value matching the
559 * size of the I/O being submitted.
560 */
561 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
68ff9b9b
NB		 562
563 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
564 DMA_FROM_DEVICE);
565 if (ret) {
566 cmd->transport_complete_callback = NULL;
567 up(&dev->caw_sem);
568 return ret;
569 }
570 /*
571 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
572 * upon MISCOMPARE, or in compare_and_write_done() upon completion
573 * of WRITE instance user-data.
574 */
575 return TCM_NO_SENSE;
576}
577
19f9361a
SG		 578static int
579sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
580 bool is_write, struct se_cmd *cmd)
581{
582 if (is_write) {
583 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS :
584 TARGET_PROT_DOUT_INSERT;
585 switch (protect) {
586 case 0x0:
587 case 0x3:
588 cmd->prot_checks = 0;
589 break;
590 case 0x1:
591 case 0x5:
592 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
593 if (prot_type == TARGET_DIF_TYPE1_PROT)
594 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
595 break;
596 case 0x2:
597 if (prot_type == TARGET_DIF_TYPE1_PROT)
598 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
599 break;
600 case 0x4:
601 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
602 break;
603 default:
604 pr_err("Unsupported protect field %d\n", protect);
605 return -EINVAL;
606 }
607 } else {
608 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS :
609 TARGET_PROT_DIN_STRIP;
610 switch (protect) {
611 case 0x0:
612 case 0x1:
613 case 0x5:
614 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
615 if (prot_type == TARGET_DIF_TYPE1_PROT)
616 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
617 break;
618 case 0x2:
619 if (prot_type == TARGET_DIF_TYPE1_PROT)
620 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
621 break;
622 case 0x3:
623 cmd->prot_checks = 0;
624 break;
625 case 0x4:
626 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
627 break;
628 default:
629 pr_err("Unsupported protect field %d\n", protect);
630 return -EINVAL;
631 }
632 }
633
634 return 0;
635}
636
f7b7c06f 637static sense_reason_t
499bf77b 638sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
19f9361a 639 u32 sectors, bool is_write)
499bf77b 640{
19f9361a
SG		 641 u8 protect = cdb[1] >> 5;
642
f7b7c06f
NB		 643 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
644 if (protect && !dev->dev_attrib.pi_prot_type) {
645 pr_err("CDB contains protect bit, but device does not"
646 " advertise PROTECT=1 feature bit\n");
647 return TCM_INVALID_CDB_FIELD;
648 }
649 if (cmd->prot_pto)
650 return TCM_NO_SENSE;
651 }
499bf77b
NB		 652
653 switch (dev->dev_attrib.pi_prot_type) {
654 case TARGET_DIF_TYPE3_PROT:
499bf77b
NB		 655 cmd->reftag_seed = 0xffffffff;
656 break;
657 case TARGET_DIF_TYPE2_PROT:
19f9361a 658 if (protect)
f7b7c06f 659 return TCM_INVALID_CDB_FIELD;
499bf77b
NB		 660
661 cmd->reftag_seed = cmd->t_task_lba;
662 break;
663 case TARGET_DIF_TYPE1_PROT:
499bf77b
NB		 664 cmd->reftag_seed = cmd->t_task_lba;
665 break;
666 case TARGET_DIF_TYPE0_PROT:
667 default:
f7b7c06f 668 return TCM_NO_SENSE;
499bf77b
NB		 669 }
670
19f9361a
SG		 671 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
672 is_write, cmd))
f7b7c06f 673 return TCM_INVALID_CDB_FIELD;
19f9361a 674
499bf77b
NB		 675 cmd->prot_type = dev->dev_attrib.pi_prot_type;
676 cmd->prot_length = dev->prot_length * sectors;
e2a4f55c
SG		 677
678 /**
679 * In case protection information exists over the wire
680 * we modify command data length to describe pure data.
681 * The actual transfer length is data length + protection
682 * length
683 **/
684 if (protect)
685 cmd->data_length = sectors * dev->dev_attrib.block_size;
686
687 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
688 "prot_op=%d prot_checks=%d\n",
689 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
03abad9e 690 cmd->prot_op, cmd->prot_checks);
499bf77b 691
f7b7c06f 692 return TCM_NO_SENSE;
499bf77b
NB		 693}
694
de103c93
CH		 695sense_reason_t
696sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
d6e0175c 697{
d6e0175c
CH		 698 struct se_device *dev = cmd->se_dev;
699 unsigned char *cdb = cmd->t_task_cdb;
1fd032ee 700 unsigned int size;
d6e0175c 701 u32 sectors = 0;
de103c93 702 sense_reason_t ret;
d6e0175c
CH		 703
704 switch (cdb[0]) {
705 case READ_6:
706 sectors = transport_get_sectors_6(cdb);
707 cmd->t_task_lba = transport_lba_21(cdb);
708 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 709 cmd->execute_rw = ops->execute_rw;
710 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 711 break;
712 case READ_10:
713 sectors = transport_get_sectors_10(cdb);
714 cmd->t_task_lba = transport_lba_32(cdb);
499bf77b 715
f7b7c06f
NB		 716 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
717 if (ret)
718 return ret;
499bf77b 719
d6e0175c 720 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 721 cmd->execute_rw = ops->execute_rw;
722 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 723 break;
724 case READ_12:
725 sectors = transport_get_sectors_12(cdb);
726 cmd->t_task_lba = transport_lba_32(cdb);
499bf77b 727
f7b7c06f
NB		 728 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
729 if (ret)
730 return ret;
499bf77b 731
d6e0175c 732 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 733 cmd->execute_rw = ops->execute_rw;
734 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 735 break;
736 case READ_16:
737 sectors = transport_get_sectors_16(cdb);
738 cmd->t_task_lba = transport_lba_64(cdb);
499bf77b 739
f7b7c06f
NB		 740 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
741 if (ret)
742 return ret;
499bf77b 743
d6e0175c 744 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 745 cmd->execute_rw = ops->execute_rw;
746 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 747 break;
748 case WRITE_6:
749 sectors = transport_get_sectors_6(cdb);
750 cmd->t_task_lba = transport_lba_21(cdb);
751 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 752 cmd->execute_rw = ops->execute_rw;
753 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 754 break;
755 case WRITE_10:
756 case WRITE_VERIFY:
757 sectors = transport_get_sectors_10(cdb);
758 cmd->t_task_lba = transport_lba_32(cdb);
499bf77b 759
f7b7c06f
NB		 760 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
761 if (ret)
762 return ret;
499bf77b 763
d6e0175c
CH		 764 if (cdb[1] & 0x8)
765 cmd->se_cmd_flags |= SCF_FUA;
766 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 767 cmd->execute_rw = ops->execute_rw;
768 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 769 break;
770 case WRITE_12:
771 sectors = transport_get_sectors_12(cdb);
772 cmd->t_task_lba = transport_lba_32(cdb);
499bf77b 773
f7b7c06f
NB		 774 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
775 if (ret)
776 return ret;
499bf77b 777
d6e0175c
CH		 778 if (cdb[1] & 0x8)
779 cmd->se_cmd_flags |= SCF_FUA;
780 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 781 cmd->execute_rw = ops->execute_rw;
782 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 783 break;
784 case WRITE_16:
785 sectors = transport_get_sectors_16(cdb);
786 cmd->t_task_lba = transport_lba_64(cdb);
499bf77b 787
f7b7c06f
NB		 788 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
789 if (ret)
790 return ret;
499bf77b 791
d6e0175c
CH		 792 if (cdb[1] & 0x8)
793 cmd->se_cmd_flags |= SCF_FUA;
794 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
a82a9538
NB		 795 cmd->execute_rw = ops->execute_rw;
796 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 797 break;
798 case XDWRITEREAD_10:
de103c93 799 if (cmd->data_direction != DMA_TO_DEVICE ||
d6e0175c 800 !(cmd->se_cmd_flags & SCF_BIDI))
de103c93 801 return TCM_INVALID_CDB_FIELD;
d6e0175c
CH		 802 sectors = transport_get_sectors_10(cdb);
803
804 cmd->t_task_lba = transport_lba_32(cdb);
805 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
806
807 /*
808 * Setup BIDI XOR callback to be run after I/O completion.
809 */
a82a9538
NB		 810 cmd->execute_rw = ops->execute_rw;
811 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 812 cmd->transport_complete_callback = &xdreadwrite_callback;
813 if (cdb[1] & 0x8)
814 cmd->se_cmd_flags |= SCF_FUA;
815 break;
816 case VARIABLE_LENGTH_CMD:
817 {
818 u16 service_action = get_unaligned_be16(&cdb[8]);
819 switch (service_action) {
820 case XDWRITEREAD_32:
821 sectors = transport_get_sectors_32(cdb);
822
823 /*
824 * Use WRITE_32 and READ_32 opcodes for the emulated
825 * XDWRITE_READ_32 logic.
826 */
827 cmd->t_task_lba = transport_lba_64_ext(cdb);
828 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
829
830 /*
831 * Setup BIDI XOR callback to be run during after I/O
832 * completion.
833 */
a82a9538
NB		 834 cmd->execute_rw = ops->execute_rw;
835 cmd->execute_cmd = sbc_execute_rw;
d6e0175c
CH		 836 cmd->transport_complete_callback = &xdreadwrite_callback;
837 if (cdb[1] & 0x8)
838 cmd->se_cmd_flags |= SCF_FUA;
839 break;
840 case WRITE_SAME_32:
841 sectors = transport_get_sectors_32(cdb);
842 if (!sectors) {
843 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
844 " supported\n");
de103c93 845 return TCM_INVALID_CDB_FIELD;
d6e0175c
CH		 846 }
847
1fd032ee 848 size = sbc_get_size(cmd, 1);
d6e0175c
CH		 849 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
850
cd063bef 851 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
6b64e1fe 852 if (ret)
cd063bef 853 return ret;
d6e0175c
CH		 854 break;
855 default:
856 pr_err("VARIABLE_LENGTH_CMD service action"
857 " 0x%04x not supported\n", service_action);
de103c93 858 return TCM_UNSUPPORTED_SCSI_OPCODE;
d6e0175c
CH		 859 }
860 break;
861 }
68ff9b9b
NB		 862 case COMPARE_AND_WRITE:
863 sectors = cdb[13];
864 /*
865 * Currently enforce COMPARE_AND_WRITE for a single sector
866 */
867 if (sectors > 1) {
868 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
869 " than 1\n", sectors);
870 return TCM_INVALID_CDB_FIELD;
871 }
872 /*
873 * Double size because we have two buffers, note that
874 * zero is not an error..
875 */
876 size = 2 * sbc_get_size(cmd, sectors);
877 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
878 cmd->t_task_nolb = sectors;
879 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
880 cmd->execute_rw = ops->execute_rw;
881 cmd->execute_cmd = sbc_compare_and_write;
882 cmd->transport_complete_callback = compare_and_write_callback;
883 break;
d6e0175c 884 case READ_CAPACITY:
1fd032ee
CH		 885 size = READ_CAP_LEN;
886 cmd->execute_cmd = sbc_emulate_readcapacity;
d6e0175c 887 break;
eb846d9f 888 case SERVICE_ACTION_IN_16:
d6e0175c
CH		 889 switch (cmd->t_task_cdb[1] & 0x1f) {
890 case SAI_READ_CAPACITY_16:
1fd032ee 891 cmd->execute_cmd = sbc_emulate_readcapacity_16;
d6e0175c 892 break;
c66094bf
HR		 893 case SAI_REPORT_REFERRALS:
894 cmd->execute_cmd = target_emulate_report_referrals;
895 break;
d6e0175c
CH		 896 default:
897 pr_err("Unsupported SA: 0x%02x\n",
898 cmd->t_task_cdb[1] & 0x1f);
de103c93 899 return TCM_INVALID_CDB_FIELD;
d6e0175c 900 }
1fd032ee 901 size = (cdb[10] << 24) | (cdb[11] << 16) |
d6e0175c
CH		 902 (cdb[12] << 8) | cdb[13];
903 break;
904 case SYNCHRONIZE_CACHE:
905 case SYNCHRONIZE_CACHE_16:
d6e0175c
CH		 906 if (cdb[0] == SYNCHRONIZE_CACHE) {
907 sectors = transport_get_sectors_10(cdb);
908 cmd->t_task_lba = transport_lba_32(cdb);
909 } else {
910 sectors = transport_get_sectors_16(cdb);
911 cmd->t_task_lba = transport_lba_64(cdb);
912 }
6ef31dc7
CVB		 913 if (ops->execute_sync_cache) {
914 cmd->execute_cmd = ops->execute_sync_cache;
915 goto check_lba;
d6e0175c 916 }
6ef31dc7
CVB		 917 size = 0;
918 cmd->execute_cmd = sbc_emulate_noop;
d6e0175c
CH		 919 break;
920 case UNMAP:
14150a6b 921 if (!ops->execute_unmap)
de103c93 922 return TCM_UNSUPPORTED_SCSI_OPCODE;
14150a6b 923
1fd032ee 924 size = get_unaligned_be16(&cdb[7]);
14150a6b 925 cmd->execute_cmd = ops->execute_unmap;
d6e0175c
CH		 926 break;
927 case WRITE_SAME_16:
928 sectors = transport_get_sectors_16(cdb);
929 if (!sectors) {
930 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
de103c93 931 return TCM_INVALID_CDB_FIELD;
d6e0175c
CH		 932 }
933
1fd032ee 934 size = sbc_get_size(cmd, 1);
d6e0175c
CH		 935 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
936
cd063bef 937 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
6b64e1fe 938 if (ret)
cd063bef 939 return ret;
d6e0175c
CH		 940 break;
941 case WRITE_SAME:
942 sectors = transport_get_sectors_10(cdb);
943 if (!sectors) {
944 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
de103c93 945 return TCM_INVALID_CDB_FIELD;
d6e0175c
CH		 946 }
947
1fd032ee 948 size = sbc_get_size(cmd, 1);
d6e0175c
CH		 949 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
950
951 /*
952 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
953 * of byte 1 bit 3 UNMAP instead of original reserved field
954 */
cd063bef 955 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
6b64e1fe 956 if (ret)
cd063bef 957 return ret;
d6e0175c
CH		 958 break;
959 case VERIFY:
1fd032ee 960 size = 0;
c52716de
CVB		 961 sectors = transport_get_sectors_10(cdb);
962 cmd->t_task_lba = transport_lba_32(cdb);
1920ed61 963 cmd->execute_cmd = sbc_emulate_noop;
c52716de 964 goto check_lba;
1a1ff38c
BK		 965 case REZERO_UNIT:
966 case SEEK_6:
967 case SEEK_10:
968 /*
969 * There are still clients out there which use these old SCSI-2
970 * commands. This mainly happens when running VMs with legacy
971 * guest systems, connected via SCSI command pass-through to
972 * iSCSI targets. Make them happy and return status GOOD.
973 */
974 size = 0;
975 cmd->execute_cmd = sbc_emulate_noop;
976 break;
d6e0175c 977 default:
1fd032ee 978 ret = spc_parse_cdb(cmd, &size);
d6e0175c
CH		 979 if (ret)
980 return ret;
981 }
982
983 /* reject any command that we don't have a handler for */
20959c4b 984 if (!cmd->execute_cmd)
de103c93 985 return TCM_UNSUPPORTED_SCSI_OPCODE;
d6e0175c
CH		 986
987 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1fd032ee
CH		 988 unsigned long long end_lba;
989
0fd97ccf 990 if (sectors > dev->dev_attrib.fabric_max_sectors) {
d6e0175c
CH		 991 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
992 " big sectors %u exceeds fabric_max_sectors:"
993 " %u\n", cdb[0], sectors,
0fd97ccf 994 dev->dev_attrib.fabric_max_sectors);
de103c93 995 return TCM_INVALID_CDB_FIELD;
d6e0175c 996 }
0fd97ccf 997 if (sectors > dev->dev_attrib.hw_max_sectors) {
d6e0175c
CH		 998 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
999 " big sectors %u exceeds backend hw_max_sectors:"
1000 " %u\n", cdb[0], sectors,
0fd97ccf 1001 dev->dev_attrib.hw_max_sectors);
de103c93 1002 return TCM_INVALID_CDB_FIELD;
d6e0175c 1003 }
6ef31dc7 1004check_lba:
1fd032ee 1005 end_lba = dev->transport->get_blocks(dev) + 1;
aa179935
NB		 1006 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1007 ((cmd->t_task_lba + sectors) > end_lba)) {
1fd032ee
CH		 1008 pr_err("cmd exceeds last lba %llu "
1009 "(lba %llu, sectors %u)\n",
1010 end_lba, cmd->t_task_lba, sectors);
09ceadc7 1011 return TCM_ADDRESS_OUT_OF_RANGE;
1fd032ee
CH		 1012 }
1013
68ff9b9b
NB		 1014 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1015 size = sbc_get_size(cmd, sectors);
d6e0175c
CH		 1016 }
1017
de103c93 1018 return target_cmd_size_check(cmd, size);
d6e0175c
CH		 1019}
1020EXPORT_SYMBOL(sbc_parse_cdb);
6f23ac8a 1021
6f23ac8a
CH		 1022u32 sbc_get_device_type(struct se_device *dev)
1023{
1024 return TYPE_DISK;
1025}
1026EXPORT_SYMBOL(sbc_get_device_type);
86d71829
AH		 1027
1028sense_reason_t
1029sbc_execute_unmap(struct se_cmd *cmd,
1030 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
1031 sector_t, sector_t),
1032 void *priv)
1033{
1034 struct se_device *dev = cmd->se_dev;
1035 unsigned char *buf, *ptr = NULL;
1036 sector_t lba;
1037 int size;
1038 u32 range;
1039 sense_reason_t ret = 0;
1040 int dl, bd_dl;
1041
1042 /* We never set ANC_SUP */
1043 if (cmd->t_task_cdb[1])
1044 return TCM_INVALID_CDB_FIELD;
1045
1046 if (cmd->data_length == 0) {
1047 target_complete_cmd(cmd, SAM_STAT_GOOD);
1048 return 0;
1049 }
1050
1051 if (cmd->data_length < 8) {
1052 pr_warn("UNMAP parameter list length %u too small\n",
1053 cmd->data_length);
1054 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1055 }
1056
1057 buf = transport_kmap_data_sg(cmd);
1058 if (!buf)
1059 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1060
1061 dl = get_unaligned_be16(&buf[0]);
1062 bd_dl = get_unaligned_be16(&buf[2]);
1063
1064 size = cmd->data_length - 8;
1065 if (bd_dl > size)
1066 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1067 cmd->data_length, bd_dl);
1068 else
1069 size = bd_dl;
1070
1071 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1072 ret = TCM_INVALID_PARAMETER_LIST;
1073 goto err;
1074 }
1075
1076 /* First UNMAP block descriptor starts at 8 byte offset */
1077 ptr = &buf[8];
1078 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1079 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1080
1081 while (size >= 16) {
1082 lba = get_unaligned_be64(&ptr[0]);
1083 range = get_unaligned_be32(&ptr[8]);
1084 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1085 (unsigned long long)lba, range);
1086
1087 if (range > dev->dev_attrib.max_unmap_lba_count) {
1088 ret = TCM_INVALID_PARAMETER_LIST;
1089 goto err;
1090 }
1091
1092 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1093 ret = TCM_ADDRESS_OUT_OF_RANGE;
1094 goto err;
1095 }
1096
1097 ret = do_unmap_fn(cmd, priv, lba, range);
1098 if (ret)
1099 goto err;
1100
1101 ptr += 16;
1102 size -= 16;
1103 }
1104
1105err:
1106 transport_kunmap_data_sg(cmd);
1107 if (!ret)
1108 target_complete_cmd(cmd, GOOD);
1109 return ret;
1110}
1111EXPORT_SYMBOL(sbc_execute_unmap);
41861fa8 1112
66a3d5bc
NB		 1113void
1114sbc_dif_generate(struct se_cmd *cmd)
1115{
1116 struct se_device *dev = cmd->se_dev;
1117 struct se_dif_v1_tuple *sdt;
1118 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1119 sector_t sector = cmd->t_task_lba;
1120 void *daddr, *paddr;
1121 int i, j, offset = 0;
1122
1123 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1124 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1125 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1126
1127 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1128
1129 if (offset >= psg->length) {
1130 kunmap_atomic(paddr);
1131 psg = sg_next(psg);
1132 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1133 offset = 0;
1134 }
1135
1136 sdt = paddr + offset;
1137 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1138 dev->dev_attrib.block_size));
1139 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
1140 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1141 sdt->app_tag = 0;
1142
1143 pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x"
1144 " app_tag: 0x%04x ref_tag: %u\n",
1145 (unsigned long long)sector, sdt->guard_tag,
1146 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1147
1148 sector++;
1149 offset += sizeof(struct se_dif_v1_tuple);
1150 }
1151
1152 kunmap_atomic(paddr);
1153 kunmap_atomic(daddr);
1154 }
1155}
1156
41861fa8
NB		 1157static sense_reason_t
1158sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
1159 const void *p, sector_t sector, unsigned int ei_lba)
1160{
1161 int block_size = dev->dev_attrib.block_size;
1162 __be16 csum;
1163
1164 csum = cpu_to_be16(crc_t10dif(p, block_size));
1165
1166 if (sdt->guard_tag != csum) {
1167 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1168 " csum 0x%04x\n", (unsigned long long)sector,
1169 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1170 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1171 }
1172
1173 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
1174 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1175 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1176 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1177 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1178 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1179 }
1180
1181 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
1182 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1183 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1184 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1185 be32_to_cpu(sdt->ref_tag), ei_lba);
1186 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1187 }
1188
1189 return 0;
1190}
1191
1192static void
1193sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1194 struct scatterlist *sg, int sg_off)
1195{
1196 struct se_device *dev = cmd->se_dev;
1197 struct scatterlist *psg;
1198 void *paddr, *addr;
1199 unsigned int i, len, left;
10762e80 1200 unsigned int offset = sg_off;
41861fa8
NB		 1201
1202 left = sectors * dev->prot_length;
1203
1204 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
16c0ae02 1205 unsigned int psg_len, copied = 0;
d6a65fdc 1206
41861fa8 1207 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
16c0ae02
SG		 1208 psg_len = min(left, psg->length);
1209 while (psg_len) {
1210 len = min(psg_len, sg->length - offset);
1211 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1212
1213 if (read)
1214 memcpy(paddr + copied, addr, len);
1215 else
1216 memcpy(addr, paddr + copied, len);
1217
1218 left -= len;
1219 offset += len;
1220 copied += len;
1221 psg_len -= len;
1222
1223 if (offset >= sg->length) {
1224 sg = sg_next(sg);
1225 offset = 0;
1226 }
1227 kunmap_atomic(addr);
1228 }
41861fa8 1229 kunmap_atomic(paddr);
41861fa8
NB		 1230 }
1231}
1232
1233sense_reason_t
1234sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1235 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1236{
1237 struct se_device *dev = cmd->se_dev;
1238 struct se_dif_v1_tuple *sdt;
1239 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1240 sector_t sector = start;
1241 void *daddr, *paddr;
1242 int i, j, offset = 0;
1243 sense_reason_t rc;
1244
1245 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1246 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1247 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1248
1249 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1250
1251 if (offset >= psg->length) {
1252 kunmap_atomic(paddr);
1253 psg = sg_next(psg);
1254 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1255 offset = 0;
1256 }
1257
1258 sdt = paddr + offset;
1259
1260 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1261 " app_tag: 0x%04x ref_tag: %u\n",
1262 (unsigned long long)sector, sdt->guard_tag,
1263 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1264
1265 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1266 ei_lba);
1267 if (rc) {
1268 kunmap_atomic(paddr);
1269 kunmap_atomic(daddr);
76736db3 1270 cmd->bad_sector = sector;
41861fa8
NB		 1271 return rc;
1272 }
1273
1274 sector++;
1275 ei_lba++;
1276 offset += sizeof(struct se_dif_v1_tuple);
1277 }
1278
1279 kunmap_atomic(paddr);
1280 kunmap_atomic(daddr);
1281 }
1282 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1283
1284 return 0;
1285}
1286EXPORT_SYMBOL(sbc_dif_verify_write);
1287
395ccb25
NB		 1288static sense_reason_t
1289__sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1290 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
41861fa8
NB		 1291{
1292 struct se_device *dev = cmd->se_dev;
1293 struct se_dif_v1_tuple *sdt;
fc272ec7 1294 struct scatterlist *dsg, *psg = sg;
41861fa8
NB		 1295 sector_t sector = start;
1296 void *daddr, *paddr;
1297 int i, j, offset = sg_off;
1298 sense_reason_t rc;
1299
1300 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1301 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
fc272ec7 1302 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
41861fa8
NB		 1303
1304 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1305
fc272ec7 1306 if (offset >= psg->length) {
41861fa8 1307 kunmap_atomic(paddr);
fc272ec7
SG		 1308 psg = sg_next(psg);
1309 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
41861fa8
NB		 1310 offset = 0;
1311 }
1312
1313 sdt = paddr + offset;
1314
1315 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1316 " app_tag: 0x%04x ref_tag: %u\n",
1317 (unsigned long long)sector, sdt->guard_tag,
1318 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1319
1320 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1321 sector++;
1322 offset += sizeof(struct se_dif_v1_tuple);
1323 continue;
1324 }
1325
1326 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1327 ei_lba);
1328 if (rc) {
1329 kunmap_atomic(paddr);
1330 kunmap_atomic(daddr);
76736db3 1331 cmd->bad_sector = sector;
41861fa8
NB		 1332 return rc;
1333 }
1334
1335 sector++;
1336 ei_lba++;
1337 offset += sizeof(struct se_dif_v1_tuple);
1338 }
1339
1340 kunmap_atomic(paddr);
1341 kunmap_atomic(daddr);
1342 }
41861fa8
NB		 1343
1344 return 0;
1345}
395ccb25
NB		 1346
1347sense_reason_t
1348sbc_dif_read_strip(struct se_cmd *cmd)
1349{
1350 struct se_device *dev = cmd->se_dev;
1351 u32 sectors = cmd->prot_length / dev->prot_length;
1352
1353 return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1354 cmd->t_prot_sg, 0);
1355}
1356
1357sense_reason_t
1358sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1359 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1360{
1361 sense_reason_t rc;
1362
1363 rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1364 if (rc)
1365 return rc;
1366
1367 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1368 return 0;
1369}
41861fa8 1370EXPORT_SYMBOL(sbc_dif_verify_read);
Linux kernel - Deliverables
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