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mtd: nand: brcmnand: Check flash #WP pin status before nand erase/program
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blobb3b1461ec60d1c824bc09f2f31c413c655946be1
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_proto.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 static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd);
42
43 static sense_reason_t
44 sbc_emulate_readcapacity(struct se_cmd *cmd)
45 {
46 struct se_device *dev = cmd->se_dev;
47 unsigned char *cdb = cmd->t_task_cdb;
48 unsigned long long blocks_long = dev->transport->get_blocks(dev);
49 unsigned char *rbuf;
50 unsigned char buf[8];
51 u32 blocks;
52
53 /*
54 * SBC-2 says:
55 * If the PMI bit is set to zero and the LOGICAL BLOCK
56 * ADDRESS field is not set to zero, the device server shall
57 * terminate the command with CHECK CONDITION status with
58 * the sense key set to ILLEGAL REQUEST and the additional
59 * sense code set to INVALID FIELD IN CDB.
60 *
61 * In SBC-3, these fields are obsolete, but some SCSI
62 * compliance tests actually check this, so we might as well
63 * follow SBC-2.
64 */
65 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
66 return TCM_INVALID_CDB_FIELD;
67
68 if (blocks_long >= 0x00000000ffffffff)
69 blocks = 0xffffffff;
70 else
71 blocks = (u32)blocks_long;
72
73 buf[0] = (blocks >> 24) & 0xff;
74 buf[1] = (blocks >> 16) & 0xff;
75 buf[2] = (blocks >> 8) & 0xff;
76 buf[3] = blocks & 0xff;
77 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
78 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
79 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
80 buf[7] = dev->dev_attrib.block_size & 0xff;
81
82 rbuf = transport_kmap_data_sg(cmd);
83 if (rbuf) {
84 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
85 transport_kunmap_data_sg(cmd);
86 }
87
88 target_complete_cmd_with_length(cmd, GOOD, 8);
89 return 0;
90 }
91
92 static sense_reason_t
93 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
94 {
95 struct se_device *dev = cmd->se_dev;
96 struct se_session *sess = cmd->se_sess;
97 int pi_prot_type = dev->dev_attrib.pi_prot_type;
98
99 unsigned char *rbuf;
100 unsigned char buf[32];
101 unsigned long long blocks = dev->transport->get_blocks(dev);
102
103 memset(buf, 0, sizeof(buf));
104 buf[0] = (blocks >> 56) & 0xff;
105 buf[1] = (blocks >> 48) & 0xff;
106 buf[2] = (blocks >> 40) & 0xff;
107 buf[3] = (blocks >> 32) & 0xff;
108 buf[4] = (blocks >> 24) & 0xff;
109 buf[5] = (blocks >> 16) & 0xff;
110 buf[6] = (blocks >> 8) & 0xff;
111 buf[7] = blocks & 0xff;
112 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
113 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
114 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
115 buf[11] = dev->dev_attrib.block_size & 0xff;
116 /*
117 * Set P_TYPE and PROT_EN bits for DIF support
118 */
119 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
120 /*
121 * Only override a device's pi_prot_type if no T10-PI is
122 * available, and sess_prot_type has been explicitly enabled.
123 */
124 if (!pi_prot_type)
125 pi_prot_type = sess->sess_prot_type;
126
127 if (pi_prot_type)
128 buf[12] = (pi_prot_type - 1) << 1 | 0x1;
129 }
130
131 if (dev->transport->get_lbppbe)
132 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
133
134 if (dev->transport->get_alignment_offset_lbas) {
135 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
136 buf[14] = (lalba >> 8) & 0x3f;
137 buf[15] = lalba & 0xff;
138 }
139
140 /*
141 * Set Thin Provisioning Enable bit following sbc3r22 in section
142 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
143 */
144 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) {
145 buf[14] |= 0x80;
146
147 /*
148 * LBPRZ signifies that zeroes will be read back from an LBA after
149 * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2)
150 */
151 if (dev->dev_attrib.unmap_zeroes_data)
152 buf[14] |= 0x40;
153 }
154
155 rbuf = transport_kmap_data_sg(cmd);
156 if (rbuf) {
157 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
158 transport_kunmap_data_sg(cmd);
159 }
160
161 target_complete_cmd_with_length(cmd, GOOD, 32);
162 return 0;
163 }
164
165 static sense_reason_t
166 sbc_emulate_startstop(struct se_cmd *cmd)
167 {
168 unsigned char *cdb = cmd->t_task_cdb;
169
170 /*
171 * See sbc3r36 section 5.25
172 * Immediate bit should be set since there is nothing to complete
173 * POWER CONDITION MODIFIER 0h
174 */
175 if (!(cdb[1] & 1) || cdb[2] || cdb[3])
176 return TCM_INVALID_CDB_FIELD;
177
178 /*
179 * See sbc3r36 section 5.25
180 * POWER CONDITION 0h START_VALID - process START and LOEJ
181 */
182 if (cdb[4] >> 4 & 0xf)
183 return TCM_INVALID_CDB_FIELD;
184
185 /*
186 * See sbc3r36 section 5.25
187 * LOEJ 0h - nothing to load or unload
188 * START 1h - we are ready
189 */
190 if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4))
191 return TCM_INVALID_CDB_FIELD;
192
193 target_complete_cmd(cmd, SAM_STAT_GOOD);
194 return 0;
195 }
196
197 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
198 {
199 u32 num_blocks;
200
201 if (cmd->t_task_cdb[0] == WRITE_SAME)
202 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
203 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
204 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
205 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
206 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
207
208 /*
209 * Use the explicit range when non zero is supplied, otherwise calculate
210 * the remaining range based on ->get_blocks() - starting LBA.
211 */
212 if (num_blocks)
213 return num_blocks;
214
215 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
216 cmd->t_task_lba + 1;
217 }
218 EXPORT_SYMBOL(sbc_get_write_same_sectors);
219
220 static sense_reason_t
221 sbc_execute_write_same_unmap(struct se_cmd *cmd)
222 {
223 struct sbc_ops *ops = cmd->protocol_data;
224 sector_t nolb = sbc_get_write_same_sectors(cmd);
225 sense_reason_t ret;
226
227 if (nolb) {
228 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb);
229 if (ret)
230 return ret;
231 }
232
233 target_complete_cmd(cmd, GOOD);
234 return 0;
235 }
236
237 static sense_reason_t
238 sbc_emulate_noop(struct se_cmd *cmd)
239 {
240 target_complete_cmd(cmd, GOOD);
241 return 0;
242 }
243
244 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
245 {
246 return cmd->se_dev->dev_attrib.block_size * sectors;
247 }
248
249 static inline u32 transport_get_sectors_6(unsigned char *cdb)
250 {
251 /*
252 * Use 8-bit sector value. SBC-3 says:
253 *
254 * A TRANSFER LENGTH field set to zero specifies that 256
255 * logical blocks shall be written. Any other value
256 * specifies the number of logical blocks that shall be
257 * written.
258 */
259 return cdb[4] ? : 256;
260 }
261
262 static inline u32 transport_get_sectors_10(unsigned char *cdb)
263 {
264 return (u32)(cdb[7] << 8) + cdb[8];
265 }
266
267 static inline u32 transport_get_sectors_12(unsigned char *cdb)
268 {
269 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
270 }
271
272 static inline u32 transport_get_sectors_16(unsigned char *cdb)
273 {
274 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
275 (cdb[12] << 8) + cdb[13];
276 }
277
278 /*
279 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
280 */
281 static inline u32 transport_get_sectors_32(unsigned char *cdb)
282 {
283 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
284 (cdb[30] << 8) + cdb[31];
285
286 }
287
288 static inline u32 transport_lba_21(unsigned char *cdb)
289 {
290 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
291 }
292
293 static inline u32 transport_lba_32(unsigned char *cdb)
294 {
295 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
296 }
297
298 static inline unsigned long long transport_lba_64(unsigned char *cdb)
299 {
300 unsigned int __v1, __v2;
301
302 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
303 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
304
305 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
306 }
307
308 /*
309 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
310 */
311 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
312 {
313 unsigned int __v1, __v2;
314
315 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
316 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
317
318 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
319 }
320
321 static sense_reason_t
322 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
323 {
324 struct se_device *dev = cmd->se_dev;
325 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
326 unsigned int sectors = sbc_get_write_same_sectors(cmd);
327 sense_reason_t ret;
328
329 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
330 pr_err("WRITE_SAME PBDATA and LBDATA"
331 " bits not supported for Block Discard"
332 " Emulation\n");
333 return TCM_UNSUPPORTED_SCSI_OPCODE;
334 }
335 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
336 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
337 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
338 return TCM_INVALID_CDB_FIELD;
339 }
340 /*
341 * Sanity check for LBA wrap and request past end of device.
342 */
343 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
344 ((cmd->t_task_lba + sectors) > end_lba)) {
345 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
346 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
347 return TCM_ADDRESS_OUT_OF_RANGE;
348 }
349
350 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
351 if (flags[0] & 0x10) {
352 pr_warn("WRITE SAME with ANCHOR not supported\n");
353 return TCM_INVALID_CDB_FIELD;
354 }
355 /*
356 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
357 * translated into block discard requests within backend code.
358 */
359 if (flags[0] & 0x08) {
360 if (!ops->execute_unmap)
361 return TCM_UNSUPPORTED_SCSI_OPCODE;
362
363 if (!dev->dev_attrib.emulate_tpws) {
364 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
365 " has emulate_tpws disabled\n");
366 return TCM_UNSUPPORTED_SCSI_OPCODE;
367 }
368 cmd->execute_cmd = sbc_execute_write_same_unmap;
369 return 0;
370 }
371 if (!ops->execute_write_same)
372 return TCM_UNSUPPORTED_SCSI_OPCODE;
373
374 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
375 if (ret)
376 return ret;
377
378 cmd->execute_cmd = ops->execute_write_same;
379 return 0;
380 }
381
382 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success,
383 int *post_ret)
384 {
385 unsigned char *buf, *addr;
386 struct scatterlist *sg;
387 unsigned int offset;
388 sense_reason_t ret = TCM_NO_SENSE;
389 int i, count;
390 /*
391 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
392 *
393 * 1) read the specified logical block(s);
394 * 2) transfer logical blocks from the data-out buffer;
395 * 3) XOR the logical blocks transferred from the data-out buffer with
396 * the logical blocks read, storing the resulting XOR data in a buffer;
397 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
398 * blocks transferred from the data-out buffer; and
399 * 5) transfer the resulting XOR data to the data-in buffer.
400 */
401 buf = kmalloc(cmd->data_length, GFP_KERNEL);
402 if (!buf) {
403 pr_err("Unable to allocate xor_callback buf\n");
404 return TCM_OUT_OF_RESOURCES;
405 }
406 /*
407 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
408 * into the locally allocated *buf
409 */
410 sg_copy_to_buffer(cmd->t_data_sg,
411 cmd->t_data_nents,
412 buf,
413 cmd->data_length);
414
415 /*
416 * Now perform the XOR against the BIDI read memory located at
417 * cmd->t_mem_bidi_list
418 */
419
420 offset = 0;
421 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
422 addr = kmap_atomic(sg_page(sg));
423 if (!addr) {
424 ret = TCM_OUT_OF_RESOURCES;
425 goto out;
426 }
427
428 for (i = 0; i < sg->length; i++)
429 *(addr + sg->offset + i) ^= *(buf + offset + i);
430
431 offset += sg->length;
432 kunmap_atomic(addr);
433 }
434
435 out:
436 kfree(buf);
437 return ret;
438 }
439
440 static sense_reason_t
441 sbc_execute_rw(struct se_cmd *cmd)
442 {
443 struct sbc_ops *ops = cmd->protocol_data;
444
445 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
446 cmd->data_direction);
447 }
448
449 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success,
450 int *post_ret)
451 {
452 struct se_device *dev = cmd->se_dev;
453 sense_reason_t ret = TCM_NO_SENSE;
454
455 /*
456 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
457 * within target_complete_ok_work() if the command was successfully
458 * sent to the backend driver.
459 */
460 spin_lock_irq(&cmd->t_state_lock);
461 if (cmd->transport_state & CMD_T_SENT) {
462 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
463 *post_ret = 1;
464
465 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
466 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
467 }
468 spin_unlock_irq(&cmd->t_state_lock);
469
470 /*
471 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
472 * before the original READ I/O submission.
473 */
474 up(&dev->caw_sem);
475
476 return ret;
477 }
478
479 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
480 int *post_ret)
481 {
482 struct se_device *dev = cmd->se_dev;
483 struct scatterlist *write_sg = NULL, *sg;
484 unsigned char *buf = NULL, *addr;
485 struct sg_mapping_iter m;
486 unsigned int offset = 0, len;
487 unsigned int nlbas = cmd->t_task_nolb;
488 unsigned int block_size = dev->dev_attrib.block_size;
489 unsigned int compare_len = (nlbas * block_size);
490 sense_reason_t ret = TCM_NO_SENSE;
491 int rc, i;
492
493 /*
494 * Handle early failure in transport_generic_request_failure(),
495 * which will not have taken ->caw_sem yet..
496 */
497 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
498 return TCM_NO_SENSE;
499 /*
500 * Handle special case for zero-length COMPARE_AND_WRITE
501 */
502 if (!cmd->data_length)
503 goto out;
504 /*
505 * Immediately exit + release dev->caw_sem if command has already
506 * been failed with a non-zero SCSI status.
507 */
508 if (cmd->scsi_status) {
509 pr_debug("compare_and_write_callback: non zero scsi_status:"
510 " 0x%02x\n", cmd->scsi_status);
511 *post_ret = 1;
512 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
513 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
514 goto out;
515 }
516
517 buf = kzalloc(cmd->data_length, GFP_KERNEL);
518 if (!buf) {
519 pr_err("Unable to allocate compare_and_write buf\n");
520 ret = TCM_OUT_OF_RESOURCES;
521 goto out;
522 }
523
524 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
525 GFP_KERNEL);
526 if (!write_sg) {
527 pr_err("Unable to allocate compare_and_write sg\n");
528 ret = TCM_OUT_OF_RESOURCES;
529 goto out;
530 }
531 sg_init_table(write_sg, cmd->t_data_nents);
532 /*
533 * Setup verify and write data payloads from total NumberLBAs.
534 */
535 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
536 cmd->data_length);
537 if (!rc) {
538 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
539 ret = TCM_OUT_OF_RESOURCES;
540 goto out;
541 }
542 /*
543 * Compare against SCSI READ payload against verify payload
544 */
545 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
546 addr = (unsigned char *)kmap_atomic(sg_page(sg));
547 if (!addr) {
548 ret = TCM_OUT_OF_RESOURCES;
549 goto out;
550 }
551
552 len = min(sg->length, compare_len);
553
554 if (memcmp(addr, buf + offset, len)) {
555 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
556 addr, buf + offset);
557 kunmap_atomic(addr);
558 goto miscompare;
559 }
560 kunmap_atomic(addr);
561
562 offset += len;
563 compare_len -= len;
564 if (!compare_len)
565 break;
566 }
567
568 i = 0;
569 len = cmd->t_task_nolb * block_size;
570 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
571 /*
572 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
573 */
574 while (len) {
575 sg_miter_next(&m);
576
577 if (block_size < PAGE_SIZE) {
578 sg_set_page(&write_sg[i], m.page, block_size,
579 m.piter.sg->offset + block_size);
580 } else {
581 sg_miter_next(&m);
582 sg_set_page(&write_sg[i], m.page, block_size,
583 m.piter.sg->offset);
584 }
585 len -= block_size;
586 i++;
587 }
588 sg_miter_stop(&m);
589 /*
590 * Save the original SGL + nents values before updating to new
591 * assignments, to be released in transport_free_pages() ->
592 * transport_reset_sgl_orig()
593 */
594 cmd->t_data_sg_orig = cmd->t_data_sg;
595 cmd->t_data_sg = write_sg;
596 cmd->t_data_nents_orig = cmd->t_data_nents;
597 cmd->t_data_nents = 1;
598
599 cmd->sam_task_attr = TCM_HEAD_TAG;
600 cmd->transport_complete_callback = compare_and_write_post;
601 /*
602 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
603 * for submitting the adjusted SGL to write instance user-data.
604 */
605 cmd->execute_cmd = sbc_execute_rw;
606
607 spin_lock_irq(&cmd->t_state_lock);
608 cmd->t_state = TRANSPORT_PROCESSING;
609 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
610 spin_unlock_irq(&cmd->t_state_lock);
611
612 __target_execute_cmd(cmd, false);
613
614 kfree(buf);
615 return ret;
616
617 miscompare:
618 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
619 dev->transport->name);
620 ret = TCM_MISCOMPARE_VERIFY;
621 out:
622 /*
623 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
624 * sbc_compare_and_write() before the original READ I/O submission.
625 */
626 up(&dev->caw_sem);
627 kfree(write_sg);
628 kfree(buf);
629 return ret;
630 }
631
632 static sense_reason_t
633 sbc_compare_and_write(struct se_cmd *cmd)
634 {
635 struct sbc_ops *ops = cmd->protocol_data;
636 struct se_device *dev = cmd->se_dev;
637 sense_reason_t ret;
638 int rc;
639 /*
640 * Submit the READ first for COMPARE_AND_WRITE to perform the
641 * comparision using SGLs at cmd->t_bidi_data_sg..
642 */
643 rc = down_interruptible(&dev->caw_sem);
644 if (rc != 0) {
645 cmd->transport_complete_callback = NULL;
646 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
647 }
648 /*
649 * Reset cmd->data_length to individual block_size in order to not
650 * confuse backend drivers that depend on this value matching the
651 * size of the I/O being submitted.
652 */
653 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
654
655 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
656 DMA_FROM_DEVICE);
657 if (ret) {
658 cmd->transport_complete_callback = NULL;
659 up(&dev->caw_sem);
660 return ret;
661 }
662 /*
663 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
664 * upon MISCOMPARE, or in compare_and_write_done() upon completion
665 * of WRITE instance user-data.
666 */
667 return TCM_NO_SENSE;
668 }
669
670 static int
671 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
672 bool is_write, struct se_cmd *cmd)
673 {
674 if (is_write) {
675 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
676 protect ? TARGET_PROT_DOUT_PASS :
677 TARGET_PROT_DOUT_INSERT;
678 switch (protect) {
679 case 0x0:
680 case 0x3:
681 cmd->prot_checks = 0;
682 break;
683 case 0x1:
684 case 0x5:
685 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
686 if (prot_type == TARGET_DIF_TYPE1_PROT)
687 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
688 break;
689 case 0x2:
690 if (prot_type == TARGET_DIF_TYPE1_PROT)
691 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
692 break;
693 case 0x4:
694 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
695 break;
696 default:
697 pr_err("Unsupported protect field %d\n", protect);
698 return -EINVAL;
699 }
700 } else {
701 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
702 protect ? TARGET_PROT_DIN_PASS :
703 TARGET_PROT_DIN_STRIP;
704 switch (protect) {
705 case 0x0:
706 case 0x1:
707 case 0x5:
708 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
709 if (prot_type == TARGET_DIF_TYPE1_PROT)
710 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
711 break;
712 case 0x2:
713 if (prot_type == TARGET_DIF_TYPE1_PROT)
714 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
715 break;
716 case 0x3:
717 cmd->prot_checks = 0;
718 break;
719 case 0x4:
720 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
721 break;
722 default:
723 pr_err("Unsupported protect field %d\n", protect);
724 return -EINVAL;
725 }
726 }
727
728 return 0;
729 }
730
731 static sense_reason_t
732 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
733 u32 sectors, bool is_write)
734 {
735 u8 protect = cdb[1] >> 5;
736 int sp_ops = cmd->se_sess->sup_prot_ops;
737 int pi_prot_type = dev->dev_attrib.pi_prot_type;
738 bool fabric_prot = false;
739
740 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
741 if (unlikely(protect &&
742 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
743 pr_err("CDB contains protect bit, but device + fabric does"
744 " not advertise PROTECT=1 feature bit\n");
745 return TCM_INVALID_CDB_FIELD;
746 }
747 if (cmd->prot_pto)
748 return TCM_NO_SENSE;
749 }
750
751 switch (dev->dev_attrib.pi_prot_type) {
752 case TARGET_DIF_TYPE3_PROT:
753 cmd->reftag_seed = 0xffffffff;
754 break;
755 case TARGET_DIF_TYPE2_PROT:
756 if (protect)
757 return TCM_INVALID_CDB_FIELD;
758
759 cmd->reftag_seed = cmd->t_task_lba;
760 break;
761 case TARGET_DIF_TYPE1_PROT:
762 cmd->reftag_seed = cmd->t_task_lba;
763 break;
764 case TARGET_DIF_TYPE0_PROT:
765 /*
766 * See if the fabric supports T10-PI, and the session has been
767 * configured to allow export PROTECT=1 feature bit with backend
768 * devices that don't support T10-PI.
769 */
770 fabric_prot = is_write ?
771 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
772 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
773
774 if (fabric_prot && cmd->se_sess->sess_prot_type) {
775 pi_prot_type = cmd->se_sess->sess_prot_type;
776 break;
777 }
778 if (!protect)
779 return TCM_NO_SENSE;
780 /* Fallthrough */
781 default:
782 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
783 "PROTECT: 0x%02x\n", cdb[0], protect);
784 return TCM_INVALID_CDB_FIELD;
785 }
786
787 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
788 return TCM_INVALID_CDB_FIELD;
789
790 cmd->prot_type = pi_prot_type;
791 cmd->prot_length = dev->prot_length * sectors;
792
793 /**
794 * In case protection information exists over the wire
795 * we modify command data length to describe pure data.
796 * The actual transfer length is data length + protection
797 * length
798 **/
799 if (protect)
800 cmd->data_length = sectors * dev->dev_attrib.block_size;
801
802 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
803 "prot_op=%d prot_checks=%d\n",
804 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
805 cmd->prot_op, cmd->prot_checks);
806
807 return TCM_NO_SENSE;
808 }
809
810 static int
811 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
812 {
813 if (cdb[1] & 0x10) {
814 /* see explanation in spc_emulate_modesense */
815 if (!target_check_fua(dev)) {
816 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
817 " does not advertise support for DPO\n", cdb[0]);
818 return -EINVAL;
819 }
820 }
821 if (cdb[1] & 0x8) {
822 if (!target_check_fua(dev)) {
823 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
824 " does not advertise support for FUA write\n",
825 cdb[0]);
826 return -EINVAL;
827 }
828 cmd->se_cmd_flags |= SCF_FUA;
829 }
830 return 0;
831 }
832
833 sense_reason_t
834 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
835 {
836 struct se_device *dev = cmd->se_dev;
837 unsigned char *cdb = cmd->t_task_cdb;
838 unsigned int size;
839 u32 sectors = 0;
840 sense_reason_t ret;
841
842 cmd->protocol_data = ops;
843
844 switch (cdb[0]) {
845 case READ_6:
846 sectors = transport_get_sectors_6(cdb);
847 cmd->t_task_lba = transport_lba_21(cdb);
848 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
849 cmd->execute_cmd = sbc_execute_rw;
850 break;
851 case READ_10:
852 sectors = transport_get_sectors_10(cdb);
853 cmd->t_task_lba = transport_lba_32(cdb);
854
855 if (sbc_check_dpofua(dev, cmd, cdb))
856 return TCM_INVALID_CDB_FIELD;
857
858 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
859 if (ret)
860 return ret;
861
862 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
863 cmd->execute_cmd = sbc_execute_rw;
864 break;
865 case READ_12:
866 sectors = transport_get_sectors_12(cdb);
867 cmd->t_task_lba = transport_lba_32(cdb);
868
869 if (sbc_check_dpofua(dev, cmd, cdb))
870 return TCM_INVALID_CDB_FIELD;
871
872 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
873 if (ret)
874 return ret;
875
876 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
877 cmd->execute_cmd = sbc_execute_rw;
878 break;
879 case READ_16:
880 sectors = transport_get_sectors_16(cdb);
881 cmd->t_task_lba = transport_lba_64(cdb);
882
883 if (sbc_check_dpofua(dev, cmd, cdb))
884 return TCM_INVALID_CDB_FIELD;
885
886 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
887 if (ret)
888 return ret;
889
890 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
891 cmd->execute_cmd = sbc_execute_rw;
892 break;
893 case WRITE_6:
894 sectors = transport_get_sectors_6(cdb);
895 cmd->t_task_lba = transport_lba_21(cdb);
896 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
897 cmd->execute_cmd = sbc_execute_rw;
898 break;
899 case WRITE_10:
900 case WRITE_VERIFY:
901 sectors = transport_get_sectors_10(cdb);
902 cmd->t_task_lba = transport_lba_32(cdb);
903
904 if (sbc_check_dpofua(dev, cmd, cdb))
905 return TCM_INVALID_CDB_FIELD;
906
907 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
908 if (ret)
909 return ret;
910
911 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
912 cmd->execute_cmd = sbc_execute_rw;
913 break;
914 case WRITE_12:
915 sectors = transport_get_sectors_12(cdb);
916 cmd->t_task_lba = transport_lba_32(cdb);
917
918 if (sbc_check_dpofua(dev, cmd, cdb))
919 return TCM_INVALID_CDB_FIELD;
920
921 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
922 if (ret)
923 return ret;
924
925 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
926 cmd->execute_cmd = sbc_execute_rw;
927 break;
928 case WRITE_16:
929 sectors = transport_get_sectors_16(cdb);
930 cmd->t_task_lba = transport_lba_64(cdb);
931
932 if (sbc_check_dpofua(dev, cmd, cdb))
933 return TCM_INVALID_CDB_FIELD;
934
935 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
936 if (ret)
937 return ret;
938
939 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
940 cmd->execute_cmd = sbc_execute_rw;
941 break;
942 case XDWRITEREAD_10:
943 if (cmd->data_direction != DMA_TO_DEVICE ||
944 !(cmd->se_cmd_flags & SCF_BIDI))
945 return TCM_INVALID_CDB_FIELD;
946 sectors = transport_get_sectors_10(cdb);
947
948 if (sbc_check_dpofua(dev, cmd, cdb))
949 return TCM_INVALID_CDB_FIELD;
950
951 cmd->t_task_lba = transport_lba_32(cdb);
952 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
953
954 /*
955 * Setup BIDI XOR callback to be run after I/O completion.
956 */
957 cmd->execute_cmd = sbc_execute_rw;
958 cmd->transport_complete_callback = &xdreadwrite_callback;
959 break;
960 case VARIABLE_LENGTH_CMD:
961 {
962 u16 service_action = get_unaligned_be16(&cdb[8]);
963 switch (service_action) {
964 case XDWRITEREAD_32:
965 sectors = transport_get_sectors_32(cdb);
966
967 if (sbc_check_dpofua(dev, cmd, cdb))
968 return TCM_INVALID_CDB_FIELD;
969 /*
970 * Use WRITE_32 and READ_32 opcodes for the emulated
971 * XDWRITE_READ_32 logic.
972 */
973 cmd->t_task_lba = transport_lba_64_ext(cdb);
974 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
975
976 /*
977 * Setup BIDI XOR callback to be run during after I/O
978 * completion.
979 */
980 cmd->execute_cmd = sbc_execute_rw;
981 cmd->transport_complete_callback = &xdreadwrite_callback;
982 break;
983 case WRITE_SAME_32:
984 sectors = transport_get_sectors_32(cdb);
985 if (!sectors) {
986 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
987 " supported\n");
988 return TCM_INVALID_CDB_FIELD;
989 }
990
991 size = sbc_get_size(cmd, 1);
992 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
993
994 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
995 if (ret)
996 return ret;
997 break;
998 default:
999 pr_err("VARIABLE_LENGTH_CMD service action"
1000 " 0x%04x not supported\n", service_action);
1001 return TCM_UNSUPPORTED_SCSI_OPCODE;
1002 }
1003 break;
1004 }
1005 case COMPARE_AND_WRITE:
1006 sectors = cdb[13];
1007 /*
1008 * Currently enforce COMPARE_AND_WRITE for a single sector
1009 */
1010 if (sectors > 1) {
1011 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
1012 " than 1\n", sectors);
1013 return TCM_INVALID_CDB_FIELD;
1014 }
1015 if (sbc_check_dpofua(dev, cmd, cdb))
1016 return TCM_INVALID_CDB_FIELD;
1017
1018 /*
1019 * Double size because we have two buffers, note that
1020 * zero is not an error..
1021 */
1022 size = 2 * sbc_get_size(cmd, sectors);
1023 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1024 cmd->t_task_nolb = sectors;
1025 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
1026 cmd->execute_cmd = sbc_compare_and_write;
1027 cmd->transport_complete_callback = compare_and_write_callback;
1028 break;
1029 case READ_CAPACITY:
1030 size = READ_CAP_LEN;
1031 cmd->execute_cmd = sbc_emulate_readcapacity;
1032 break;
1033 case SERVICE_ACTION_IN_16:
1034 switch (cmd->t_task_cdb[1] & 0x1f) {
1035 case SAI_READ_CAPACITY_16:
1036 cmd->execute_cmd = sbc_emulate_readcapacity_16;
1037 break;
1038 case SAI_REPORT_REFERRALS:
1039 cmd->execute_cmd = target_emulate_report_referrals;
1040 break;
1041 default:
1042 pr_err("Unsupported SA: 0x%02x\n",
1043 cmd->t_task_cdb[1] & 0x1f);
1044 return TCM_INVALID_CDB_FIELD;
1045 }
1046 size = (cdb[10] << 24) | (cdb[11] << 16) |
1047 (cdb[12] << 8) | cdb[13];
1048 break;
1049 case SYNCHRONIZE_CACHE:
1050 case SYNCHRONIZE_CACHE_16:
1051 if (cdb[0] == SYNCHRONIZE_CACHE) {
1052 sectors = transport_get_sectors_10(cdb);
1053 cmd->t_task_lba = transport_lba_32(cdb);
1054 } else {
1055 sectors = transport_get_sectors_16(cdb);
1056 cmd->t_task_lba = transport_lba_64(cdb);
1057 }
1058 if (ops->execute_sync_cache) {
1059 cmd->execute_cmd = ops->execute_sync_cache;
1060 goto check_lba;
1061 }
1062 size = 0;
1063 cmd->execute_cmd = sbc_emulate_noop;
1064 break;
1065 case UNMAP:
1066 if (!ops->execute_unmap)
1067 return TCM_UNSUPPORTED_SCSI_OPCODE;
1068
1069 if (!dev->dev_attrib.emulate_tpu) {
1070 pr_err("Got UNMAP, but backend device has"
1071 " emulate_tpu disabled\n");
1072 return TCM_UNSUPPORTED_SCSI_OPCODE;
1073 }
1074 size = get_unaligned_be16(&cdb[7]);
1075 cmd->execute_cmd = sbc_execute_unmap;
1076 break;
1077 case WRITE_SAME_16:
1078 sectors = transport_get_sectors_16(cdb);
1079 if (!sectors) {
1080 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1081 return TCM_INVALID_CDB_FIELD;
1082 }
1083
1084 size = sbc_get_size(cmd, 1);
1085 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1086
1087 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1088 if (ret)
1089 return ret;
1090 break;
1091 case WRITE_SAME:
1092 sectors = transport_get_sectors_10(cdb);
1093 if (!sectors) {
1094 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1095 return TCM_INVALID_CDB_FIELD;
1096 }
1097
1098 size = sbc_get_size(cmd, 1);
1099 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1100
1101 /*
1102 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1103 * of byte 1 bit 3 UNMAP instead of original reserved field
1104 */
1105 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1106 if (ret)
1107 return ret;
1108 break;
1109 case VERIFY:
1110 case VERIFY_16:
1111 size = 0;
1112 if (cdb[0] == VERIFY) {
1113 sectors = transport_get_sectors_10(cdb);
1114 cmd->t_task_lba = transport_lba_32(cdb);
1115 } else {
1116 sectors = transport_get_sectors_16(cdb);
1117 cmd->t_task_lba = transport_lba_64(cdb);
1118 }
1119 cmd->execute_cmd = sbc_emulate_noop;
1120 goto check_lba;
1121 case REZERO_UNIT:
1122 case SEEK_6:
1123 case SEEK_10:
1124 /*
1125 * There are still clients out there which use these old SCSI-2
1126 * commands. This mainly happens when running VMs with legacy
1127 * guest systems, connected via SCSI command pass-through to
1128 * iSCSI targets. Make them happy and return status GOOD.
1129 */
1130 size = 0;
1131 cmd->execute_cmd = sbc_emulate_noop;
1132 break;
1133 case START_STOP:
1134 size = 0;
1135 cmd->execute_cmd = sbc_emulate_startstop;
1136 break;
1137 default:
1138 ret = spc_parse_cdb(cmd, &size);
1139 if (ret)
1140 return ret;
1141 }
1142
1143 /* reject any command that we don't have a handler for */
1144 if (!cmd->execute_cmd)
1145 return TCM_UNSUPPORTED_SCSI_OPCODE;
1146
1147 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1148 unsigned long long end_lba;
1149 check_lba:
1150 end_lba = dev->transport->get_blocks(dev) + 1;
1151 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1152 ((cmd->t_task_lba + sectors) > end_lba)) {
1153 pr_err("cmd exceeds last lba %llu "
1154 "(lba %llu, sectors %u)\n",
1155 end_lba, cmd->t_task_lba, sectors);
1156 return TCM_ADDRESS_OUT_OF_RANGE;
1157 }
1158
1159 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1160 size = sbc_get_size(cmd, sectors);
1161 }
1162
1163 return target_cmd_size_check(cmd, size);
1164 }
1165 EXPORT_SYMBOL(sbc_parse_cdb);
1166
1167 u32 sbc_get_device_type(struct se_device *dev)
1168 {
1169 return TYPE_DISK;
1170 }
1171 EXPORT_SYMBOL(sbc_get_device_type);
1172
1173 static sense_reason_t
1174 sbc_execute_unmap(struct se_cmd *cmd)
1175 {
1176 struct sbc_ops *ops = cmd->protocol_data;
1177 struct se_device *dev = cmd->se_dev;
1178 unsigned char *buf, *ptr = NULL;
1179 sector_t lba;
1180 int size;
1181 u32 range;
1182 sense_reason_t ret = 0;
1183 int dl, bd_dl;
1184
1185 /* We never set ANC_SUP */
1186 if (cmd->t_task_cdb[1])
1187 return TCM_INVALID_CDB_FIELD;
1188
1189 if (cmd->data_length == 0) {
1190 target_complete_cmd(cmd, SAM_STAT_GOOD);
1191 return 0;
1192 }
1193
1194 if (cmd->data_length < 8) {
1195 pr_warn("UNMAP parameter list length %u too small\n",
1196 cmd->data_length);
1197 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1198 }
1199
1200 buf = transport_kmap_data_sg(cmd);
1201 if (!buf)
1202 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1203
1204 dl = get_unaligned_be16(&buf[0]);
1205 bd_dl = get_unaligned_be16(&buf[2]);
1206
1207 size = cmd->data_length - 8;
1208 if (bd_dl > size)
1209 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1210 cmd->data_length, bd_dl);
1211 else
1212 size = bd_dl;
1213
1214 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1215 ret = TCM_INVALID_PARAMETER_LIST;
1216 goto err;
1217 }
1218
1219 /* First UNMAP block descriptor starts at 8 byte offset */
1220 ptr = &buf[8];
1221 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1222 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1223
1224 while (size >= 16) {
1225 lba = get_unaligned_be64(&ptr[0]);
1226 range = get_unaligned_be32(&ptr[8]);
1227 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1228 (unsigned long long)lba, range);
1229
1230 if (range > dev->dev_attrib.max_unmap_lba_count) {
1231 ret = TCM_INVALID_PARAMETER_LIST;
1232 goto err;
1233 }
1234
1235 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1236 ret = TCM_ADDRESS_OUT_OF_RANGE;
1237 goto err;
1238 }
1239
1240 ret = ops->execute_unmap(cmd, lba, range);
1241 if (ret)
1242 goto err;
1243
1244 ptr += 16;
1245 size -= 16;
1246 }
1247
1248 err:
1249 transport_kunmap_data_sg(cmd);
1250 if (!ret)
1251 target_complete_cmd(cmd, GOOD);
1252 return ret;
1253 }
1254
1255 void
1256 sbc_dif_generate(struct se_cmd *cmd)
1257 {
1258 struct se_device *dev = cmd->se_dev;
1259 struct t10_pi_tuple *sdt;
1260 struct scatterlist *dsg = cmd->t_data_sg, *psg;
1261 sector_t sector = cmd->t_task_lba;
1262 void *daddr, *paddr;
1263 int i, j, offset = 0;
1264 unsigned int block_size = dev->dev_attrib.block_size;
1265
1266 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1267 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1268 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1269
1270 for (j = 0; j < psg->length;
1271 j += sizeof(*sdt)) {
1272 __u16 crc;
1273 unsigned int avail;
1274
1275 if (offset >= dsg->length) {
1276 offset -= dsg->length;
1277 kunmap_atomic(daddr - dsg->offset);
1278 dsg = sg_next(dsg);
1279 if (!dsg) {
1280 kunmap_atomic(paddr - psg->offset);
1281 return;
1282 }
1283 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1284 }
1285
1286 sdt = paddr + j;
1287 avail = min(block_size, dsg->length - offset);
1288 crc = crc_t10dif(daddr + offset, avail);
1289 if (avail < block_size) {
1290 kunmap_atomic(daddr - dsg->offset);
1291 dsg = sg_next(dsg);
1292 if (!dsg) {
1293 kunmap_atomic(paddr - psg->offset);
1294 return;
1295 }
1296 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1297 offset = block_size - avail;
1298 crc = crc_t10dif_update(crc, daddr, offset);
1299 } else {
1300 offset += block_size;
1301 }
1302
1303 sdt->guard_tag = cpu_to_be16(crc);
1304 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1305 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1306 sdt->app_tag = 0;
1307
1308 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1309 " app_tag: 0x%04x ref_tag: %u\n",
1310 (cmd->data_direction == DMA_TO_DEVICE) ?
1311 "WRITE" : "READ", (unsigned long long)sector,
1312 sdt->guard_tag, sdt->app_tag,
1313 be32_to_cpu(sdt->ref_tag));
1314
1315 sector++;
1316 }
1317
1318 kunmap_atomic(daddr - dsg->offset);
1319 kunmap_atomic(paddr - psg->offset);
1320 }
1321 }
1322
1323 static sense_reason_t
1324 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt,
1325 __u16 crc, sector_t sector, unsigned int ei_lba)
1326 {
1327 __be16 csum;
1328
1329 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1330 goto check_ref;
1331
1332 csum = cpu_to_be16(crc);
1333
1334 if (sdt->guard_tag != csum) {
1335 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1336 " csum 0x%04x\n", (unsigned long long)sector,
1337 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1338 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1339 }
1340
1341 check_ref:
1342 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1343 return 0;
1344
1345 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1346 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1347 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1348 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1349 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1350 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1351 }
1352
1353 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1354 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1355 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1356 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1357 be32_to_cpu(sdt->ref_tag), ei_lba);
1358 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1359 }
1360
1361 return 0;
1362 }
1363
1364 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1365 struct scatterlist *sg, int sg_off)
1366 {
1367 struct se_device *dev = cmd->se_dev;
1368 struct scatterlist *psg;
1369 void *paddr, *addr;
1370 unsigned int i, len, left;
1371 unsigned int offset = sg_off;
1372
1373 if (!sg)
1374 return;
1375
1376 left = sectors * dev->prot_length;
1377
1378 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1379 unsigned int psg_len, copied = 0;
1380
1381 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1382 psg_len = min(left, psg->length);
1383 while (psg_len) {
1384 len = min(psg_len, sg->length - offset);
1385 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1386
1387 if (read)
1388 memcpy(paddr + copied, addr, len);
1389 else
1390 memcpy(addr, paddr + copied, len);
1391
1392 left -= len;
1393 offset += len;
1394 copied += len;
1395 psg_len -= len;
1396
1397 kunmap_atomic(addr - sg->offset - offset);
1398
1399 if (offset >= sg->length) {
1400 sg = sg_next(sg);
1401 offset = 0;
1402 }
1403 }
1404 kunmap_atomic(paddr - psg->offset);
1405 }
1406 }
1407 EXPORT_SYMBOL(sbc_dif_copy_prot);
1408
1409 sense_reason_t
1410 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1411 unsigned int ei_lba, struct scatterlist *psg, int psg_off)
1412 {
1413 struct se_device *dev = cmd->se_dev;
1414 struct t10_pi_tuple *sdt;
1415 struct scatterlist *dsg = cmd->t_data_sg;
1416 sector_t sector = start;
1417 void *daddr, *paddr;
1418 int i;
1419 sense_reason_t rc;
1420 int dsg_off = 0;
1421 unsigned int block_size = dev->dev_attrib.block_size;
1422
1423 for (; psg && sector < start + sectors; psg = sg_next(psg)) {
1424 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1425 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1426
1427 for (i = psg_off; i < psg->length &&
1428 sector < start + sectors;
1429 i += sizeof(*sdt)) {
1430 __u16 crc;
1431 unsigned int avail;
1432
1433 if (dsg_off >= dsg->length) {
1434 dsg_off -= dsg->length;
1435 kunmap_atomic(daddr - dsg->offset);
1436 dsg = sg_next(dsg);
1437 if (!dsg) {
1438 kunmap_atomic(paddr - psg->offset);
1439 return 0;
1440 }
1441 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1442 }
1443
1444 sdt = paddr + i;
1445
1446 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1447 " app_tag: 0x%04x ref_tag: %u\n",
1448 (unsigned long long)sector, sdt->guard_tag,
1449 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1450
1451 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1452 dsg_off += block_size;
1453 goto next;
1454 }
1455
1456 avail = min(block_size, dsg->length - dsg_off);
1457 crc = crc_t10dif(daddr + dsg_off, avail);
1458 if (avail < block_size) {
1459 kunmap_atomic(daddr - dsg->offset);
1460 dsg = sg_next(dsg);
1461 if (!dsg) {
1462 kunmap_atomic(paddr - psg->offset);
1463 return 0;
1464 }
1465 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1466 dsg_off = block_size - avail;
1467 crc = crc_t10dif_update(crc, daddr, dsg_off);
1468 } else {
1469 dsg_off += block_size;
1470 }
1471
1472 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
1473 if (rc) {
1474 kunmap_atomic(daddr - dsg->offset);
1475 kunmap_atomic(paddr - psg->offset);
1476 cmd->bad_sector = sector;
1477 return rc;
1478 }
1479 next:
1480 sector++;
1481 ei_lba++;
1482 }
1483
1484 psg_off = 0;
1485 kunmap_atomic(daddr - dsg->offset);
1486 kunmap_atomic(paddr - psg->offset);
1487 }
1488
1489 return 0;
1490 }
1491 EXPORT_SYMBOL(sbc_dif_verify);
Linux with added FPC-III support