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irqchip/zevio: Use irq_data_get_chip_type() helper
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blob98698d87574262226bcf893da2cb3d3849e6df32
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 rbuf = transport_kmap_data_sg(cmd);
148 if (rbuf) {
149 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
150 transport_kunmap_data_sg(cmd);
151 }
152
153 target_complete_cmd_with_length(cmd, GOOD, 32);
154 return 0;
155 }
156
157 static sense_reason_t
158 sbc_emulate_startstop(struct se_cmd *cmd)
159 {
160 unsigned char *cdb = cmd->t_task_cdb;
161
162 /*
163 * See sbc3r36 section 5.25
164 * Immediate bit should be set since there is nothing to complete
165 * POWER CONDITION MODIFIER 0h
166 */
167 if (!(cdb[1] & 1) || cdb[2] || cdb[3])
168 return TCM_INVALID_CDB_FIELD;
169
170 /*
171 * See sbc3r36 section 5.25
172 * POWER CONDITION 0h START_VALID - process START and LOEJ
173 */
174 if (cdb[4] >> 4 & 0xf)
175 return TCM_INVALID_CDB_FIELD;
176
177 /*
178 * See sbc3r36 section 5.25
179 * LOEJ 0h - nothing to load or unload
180 * START 1h - we are ready
181 */
182 if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4))
183 return TCM_INVALID_CDB_FIELD;
184
185 target_complete_cmd(cmd, SAM_STAT_GOOD);
186 return 0;
187 }
188
189 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
190 {
191 u32 num_blocks;
192
193 if (cmd->t_task_cdb[0] == WRITE_SAME)
194 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
195 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
196 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
197 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
198 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
199
200 /*
201 * Use the explicit range when non zero is supplied, otherwise calculate
202 * the remaining range based on ->get_blocks() - starting LBA.
203 */
204 if (num_blocks)
205 return num_blocks;
206
207 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
208 cmd->t_task_lba + 1;
209 }
210 EXPORT_SYMBOL(sbc_get_write_same_sectors);
211
212 static sense_reason_t
213 sbc_execute_write_same_unmap(struct se_cmd *cmd)
214 {
215 struct sbc_ops *ops = cmd->protocol_data;
216 sector_t nolb = sbc_get_write_same_sectors(cmd);
217 sense_reason_t ret;
218
219 if (nolb) {
220 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb);
221 if (ret)
222 return ret;
223 }
224
225 target_complete_cmd(cmd, GOOD);
226 return 0;
227 }
228
229 static sense_reason_t
230 sbc_emulate_noop(struct se_cmd *cmd)
231 {
232 target_complete_cmd(cmd, GOOD);
233 return 0;
234 }
235
236 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
237 {
238 return cmd->se_dev->dev_attrib.block_size * sectors;
239 }
240
241 static inline u32 transport_get_sectors_6(unsigned char *cdb)
242 {
243 /*
244 * Use 8-bit sector value. SBC-3 says:
245 *
246 * A TRANSFER LENGTH field set to zero specifies that 256
247 * logical blocks shall be written. Any other value
248 * specifies the number of logical blocks that shall be
249 * written.
250 */
251 return cdb[4] ? : 256;
252 }
253
254 static inline u32 transport_get_sectors_10(unsigned char *cdb)
255 {
256 return (u32)(cdb[7] << 8) + cdb[8];
257 }
258
259 static inline u32 transport_get_sectors_12(unsigned char *cdb)
260 {
261 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
262 }
263
264 static inline u32 transport_get_sectors_16(unsigned char *cdb)
265 {
266 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
267 (cdb[12] << 8) + cdb[13];
268 }
269
270 /*
271 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
272 */
273 static inline u32 transport_get_sectors_32(unsigned char *cdb)
274 {
275 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
276 (cdb[30] << 8) + cdb[31];
277
278 }
279
280 static inline u32 transport_lba_21(unsigned char *cdb)
281 {
282 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
283 }
284
285 static inline u32 transport_lba_32(unsigned char *cdb)
286 {
287 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
288 }
289
290 static inline unsigned long long transport_lba_64(unsigned char *cdb)
291 {
292 unsigned int __v1, __v2;
293
294 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
295 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
296
297 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
298 }
299
300 /*
301 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
302 */
303 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
304 {
305 unsigned int __v1, __v2;
306
307 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
308 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
309
310 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
311 }
312
313 static sense_reason_t
314 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
315 {
316 struct se_device *dev = cmd->se_dev;
317 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
318 unsigned int sectors = sbc_get_write_same_sectors(cmd);
319 sense_reason_t ret;
320
321 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
322 pr_err("WRITE_SAME PBDATA and LBDATA"
323 " bits not supported for Block Discard"
324 " Emulation\n");
325 return TCM_UNSUPPORTED_SCSI_OPCODE;
326 }
327 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
328 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
329 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
330 return TCM_INVALID_CDB_FIELD;
331 }
332 /*
333 * Sanity check for LBA wrap and request past end of device.
334 */
335 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
336 ((cmd->t_task_lba + sectors) > end_lba)) {
337 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
338 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
339 return TCM_ADDRESS_OUT_OF_RANGE;
340 }
341
342 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
343 if (flags[0] & 0x10) {
344 pr_warn("WRITE SAME with ANCHOR not supported\n");
345 return TCM_INVALID_CDB_FIELD;
346 }
347 /*
348 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
349 * translated into block discard requests within backend code.
350 */
351 if (flags[0] & 0x08) {
352 if (!ops->execute_unmap)
353 return TCM_UNSUPPORTED_SCSI_OPCODE;
354
355 if (!dev->dev_attrib.emulate_tpws) {
356 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
357 " has emulate_tpws disabled\n");
358 return TCM_UNSUPPORTED_SCSI_OPCODE;
359 }
360 cmd->execute_cmd = sbc_execute_write_same_unmap;
361 return 0;
362 }
363 if (!ops->execute_write_same)
364 return TCM_UNSUPPORTED_SCSI_OPCODE;
365
366 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
367 if (ret)
368 return ret;
369
370 cmd->execute_cmd = ops->execute_write_same;
371 return 0;
372 }
373
374 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success,
375 int *post_ret)
376 {
377 unsigned char *buf, *addr;
378 struct scatterlist *sg;
379 unsigned int offset;
380 sense_reason_t ret = TCM_NO_SENSE;
381 int i, count;
382 /*
383 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
384 *
385 * 1) read the specified logical block(s);
386 * 2) transfer logical blocks from the data-out buffer;
387 * 3) XOR the logical blocks transferred from the data-out buffer with
388 * the logical blocks read, storing the resulting XOR data in a buffer;
389 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
390 * blocks transferred from the data-out buffer; and
391 * 5) transfer the resulting XOR data to the data-in buffer.
392 */
393 buf = kmalloc(cmd->data_length, GFP_KERNEL);
394 if (!buf) {
395 pr_err("Unable to allocate xor_callback buf\n");
396 return TCM_OUT_OF_RESOURCES;
397 }
398 /*
399 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
400 * into the locally allocated *buf
401 */
402 sg_copy_to_buffer(cmd->t_data_sg,
403 cmd->t_data_nents,
404 buf,
405 cmd->data_length);
406
407 /*
408 * Now perform the XOR against the BIDI read memory located at
409 * cmd->t_mem_bidi_list
410 */
411
412 offset = 0;
413 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
414 addr = kmap_atomic(sg_page(sg));
415 if (!addr) {
416 ret = TCM_OUT_OF_RESOURCES;
417 goto out;
418 }
419
420 for (i = 0; i < sg->length; i++)
421 *(addr + sg->offset + i) ^= *(buf + offset + i);
422
423 offset += sg->length;
424 kunmap_atomic(addr);
425 }
426
427 out:
428 kfree(buf);
429 return ret;
430 }
431
432 static sense_reason_t
433 sbc_execute_rw(struct se_cmd *cmd)
434 {
435 struct sbc_ops *ops = cmd->protocol_data;
436
437 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
438 cmd->data_direction);
439 }
440
441 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success,
442 int *post_ret)
443 {
444 struct se_device *dev = cmd->se_dev;
445
446 /*
447 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
448 * within target_complete_ok_work() if the command was successfully
449 * sent to the backend driver.
450 */
451 spin_lock_irq(&cmd->t_state_lock);
452 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) {
453 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
454 *post_ret = 1;
455 }
456 spin_unlock_irq(&cmd->t_state_lock);
457
458 /*
459 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
460 * before the original READ I/O submission.
461 */
462 up(&dev->caw_sem);
463
464 return TCM_NO_SENSE;
465 }
466
467 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
468 int *post_ret)
469 {
470 struct se_device *dev = cmd->se_dev;
471 struct scatterlist *write_sg = NULL, *sg;
472 unsigned char *buf = NULL, *addr;
473 struct sg_mapping_iter m;
474 unsigned int offset = 0, len;
475 unsigned int nlbas = cmd->t_task_nolb;
476 unsigned int block_size = dev->dev_attrib.block_size;
477 unsigned int compare_len = (nlbas * block_size);
478 sense_reason_t ret = TCM_NO_SENSE;
479 int rc, i;
480
481 /*
482 * Handle early failure in transport_generic_request_failure(),
483 * which will not have taken ->caw_sem yet..
484 */
485 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
486 return TCM_NO_SENSE;
487 /*
488 * Handle special case for zero-length COMPARE_AND_WRITE
489 */
490 if (!cmd->data_length)
491 goto out;
492 /*
493 * Immediately exit + release dev->caw_sem if command has already
494 * been failed with a non-zero SCSI status.
495 */
496 if (cmd->scsi_status) {
497 pr_err("compare_and_write_callback: non zero scsi_status:"
498 " 0x%02x\n", cmd->scsi_status);
499 goto out;
500 }
501
502 buf = kzalloc(cmd->data_length, GFP_KERNEL);
503 if (!buf) {
504 pr_err("Unable to allocate compare_and_write buf\n");
505 ret = TCM_OUT_OF_RESOURCES;
506 goto out;
507 }
508
509 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
510 GFP_KERNEL);
511 if (!write_sg) {
512 pr_err("Unable to allocate compare_and_write sg\n");
513 ret = TCM_OUT_OF_RESOURCES;
514 goto out;
515 }
516 sg_init_table(write_sg, cmd->t_data_nents);
517 /*
518 * Setup verify and write data payloads from total NumberLBAs.
519 */
520 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
521 cmd->data_length);
522 if (!rc) {
523 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
524 ret = TCM_OUT_OF_RESOURCES;
525 goto out;
526 }
527 /*
528 * Compare against SCSI READ payload against verify payload
529 */
530 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
531 addr = (unsigned char *)kmap_atomic(sg_page(sg));
532 if (!addr) {
533 ret = TCM_OUT_OF_RESOURCES;
534 goto out;
535 }
536
537 len = min(sg->length, compare_len);
538
539 if (memcmp(addr, buf + offset, len)) {
540 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
541 addr, buf + offset);
542 kunmap_atomic(addr);
543 goto miscompare;
544 }
545 kunmap_atomic(addr);
546
547 offset += len;
548 compare_len -= len;
549 if (!compare_len)
550 break;
551 }
552
553 i = 0;
554 len = cmd->t_task_nolb * block_size;
555 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
556 /*
557 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
558 */
559 while (len) {
560 sg_miter_next(&m);
561
562 if (block_size < PAGE_SIZE) {
563 sg_set_page(&write_sg[i], m.page, block_size,
564 m.piter.sg->offset + block_size);
565 } else {
566 sg_miter_next(&m);
567 sg_set_page(&write_sg[i], m.page, block_size,
568 m.piter.sg->offset);
569 }
570 len -= block_size;
571 i++;
572 }
573 sg_miter_stop(&m);
574 /*
575 * Save the original SGL + nents values before updating to new
576 * assignments, to be released in transport_free_pages() ->
577 * transport_reset_sgl_orig()
578 */
579 cmd->t_data_sg_orig = cmd->t_data_sg;
580 cmd->t_data_sg = write_sg;
581 cmd->t_data_nents_orig = cmd->t_data_nents;
582 cmd->t_data_nents = 1;
583
584 cmd->sam_task_attr = TCM_HEAD_TAG;
585 cmd->transport_complete_callback = compare_and_write_post;
586 /*
587 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
588 * for submitting the adjusted SGL to write instance user-data.
589 */
590 cmd->execute_cmd = sbc_execute_rw;
591
592 spin_lock_irq(&cmd->t_state_lock);
593 cmd->t_state = TRANSPORT_PROCESSING;
594 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
595 spin_unlock_irq(&cmd->t_state_lock);
596
597 __target_execute_cmd(cmd);
598
599 kfree(buf);
600 return ret;
601
602 miscompare:
603 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
604 dev->transport->name);
605 ret = TCM_MISCOMPARE_VERIFY;
606 out:
607 /*
608 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
609 * sbc_compare_and_write() before the original READ I/O submission.
610 */
611 up(&dev->caw_sem);
612 kfree(write_sg);
613 kfree(buf);
614 return ret;
615 }
616
617 static sense_reason_t
618 sbc_compare_and_write(struct se_cmd *cmd)
619 {
620 struct sbc_ops *ops = cmd->protocol_data;
621 struct se_device *dev = cmd->se_dev;
622 sense_reason_t ret;
623 int rc;
624 /*
625 * Submit the READ first for COMPARE_AND_WRITE to perform the
626 * comparision using SGLs at cmd->t_bidi_data_sg..
627 */
628 rc = down_interruptible(&dev->caw_sem);
629 if (rc != 0) {
630 cmd->transport_complete_callback = NULL;
631 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
632 }
633 /*
634 * Reset cmd->data_length to individual block_size in order to not
635 * confuse backend drivers that depend on this value matching the
636 * size of the I/O being submitted.
637 */
638 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
639
640 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
641 DMA_FROM_DEVICE);
642 if (ret) {
643 cmd->transport_complete_callback = NULL;
644 up(&dev->caw_sem);
645 return ret;
646 }
647 /*
648 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
649 * upon MISCOMPARE, or in compare_and_write_done() upon completion
650 * of WRITE instance user-data.
651 */
652 return TCM_NO_SENSE;
653 }
654
655 static int
656 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
657 bool is_write, struct se_cmd *cmd)
658 {
659 if (is_write) {
660 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
661 protect ? TARGET_PROT_DOUT_PASS :
662 TARGET_PROT_DOUT_INSERT;
663 switch (protect) {
664 case 0x0:
665 case 0x3:
666 cmd->prot_checks = 0;
667 break;
668 case 0x1:
669 case 0x5:
670 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
671 if (prot_type == TARGET_DIF_TYPE1_PROT)
672 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
673 break;
674 case 0x2:
675 if (prot_type == TARGET_DIF_TYPE1_PROT)
676 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
677 break;
678 case 0x4:
679 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
680 break;
681 default:
682 pr_err("Unsupported protect field %d\n", protect);
683 return -EINVAL;
684 }
685 } else {
686 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
687 protect ? TARGET_PROT_DIN_PASS :
688 TARGET_PROT_DIN_STRIP;
689 switch (protect) {
690 case 0x0:
691 case 0x1:
692 case 0x5:
693 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
694 if (prot_type == TARGET_DIF_TYPE1_PROT)
695 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
696 break;
697 case 0x2:
698 if (prot_type == TARGET_DIF_TYPE1_PROT)
699 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
700 break;
701 case 0x3:
702 cmd->prot_checks = 0;
703 break;
704 case 0x4:
705 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
706 break;
707 default:
708 pr_err("Unsupported protect field %d\n", protect);
709 return -EINVAL;
710 }
711 }
712
713 return 0;
714 }
715
716 static sense_reason_t
717 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
718 u32 sectors, bool is_write)
719 {
720 u8 protect = cdb[1] >> 5;
721 int sp_ops = cmd->se_sess->sup_prot_ops;
722 int pi_prot_type = dev->dev_attrib.pi_prot_type;
723 bool fabric_prot = false;
724
725 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
726 if (unlikely(protect &&
727 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
728 pr_err("CDB contains protect bit, but device + fabric does"
729 " not advertise PROTECT=1 feature bit\n");
730 return TCM_INVALID_CDB_FIELD;
731 }
732 if (cmd->prot_pto)
733 return TCM_NO_SENSE;
734 }
735
736 switch (dev->dev_attrib.pi_prot_type) {
737 case TARGET_DIF_TYPE3_PROT:
738 cmd->reftag_seed = 0xffffffff;
739 break;
740 case TARGET_DIF_TYPE2_PROT:
741 if (protect)
742 return TCM_INVALID_CDB_FIELD;
743
744 cmd->reftag_seed = cmd->t_task_lba;
745 break;
746 case TARGET_DIF_TYPE1_PROT:
747 cmd->reftag_seed = cmd->t_task_lba;
748 break;
749 case TARGET_DIF_TYPE0_PROT:
750 /*
751 * See if the fabric supports T10-PI, and the session has been
752 * configured to allow export PROTECT=1 feature bit with backend
753 * devices that don't support T10-PI.
754 */
755 fabric_prot = is_write ?
756 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
757 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
758
759 if (fabric_prot && cmd->se_sess->sess_prot_type) {
760 pi_prot_type = cmd->se_sess->sess_prot_type;
761 break;
762 }
763 if (!protect)
764 return TCM_NO_SENSE;
765 /* Fallthrough */
766 default:
767 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
768 "PROTECT: 0x%02x\n", cdb[0], protect);
769 return TCM_INVALID_CDB_FIELD;
770 }
771
772 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
773 return TCM_INVALID_CDB_FIELD;
774
775 cmd->prot_type = pi_prot_type;
776 cmd->prot_length = dev->prot_length * sectors;
777
778 /**
779 * In case protection information exists over the wire
780 * we modify command data length to describe pure data.
781 * The actual transfer length is data length + protection
782 * length
783 **/
784 if (protect)
785 cmd->data_length = sectors * dev->dev_attrib.block_size;
786
787 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
788 "prot_op=%d prot_checks=%d\n",
789 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
790 cmd->prot_op, cmd->prot_checks);
791
792 return TCM_NO_SENSE;
793 }
794
795 static int
796 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
797 {
798 if (cdb[1] & 0x10) {
799 /* see explanation in spc_emulate_modesense */
800 if (!target_check_fua(dev)) {
801 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
802 " does not advertise support for DPO\n", cdb[0]);
803 return -EINVAL;
804 }
805 }
806 if (cdb[1] & 0x8) {
807 if (!target_check_fua(dev)) {
808 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
809 " does not advertise support for FUA write\n",
810 cdb[0]);
811 return -EINVAL;
812 }
813 cmd->se_cmd_flags |= SCF_FUA;
814 }
815 return 0;
816 }
817
818 sense_reason_t
819 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
820 {
821 struct se_device *dev = cmd->se_dev;
822 unsigned char *cdb = cmd->t_task_cdb;
823 unsigned int size;
824 u32 sectors = 0;
825 sense_reason_t ret;
826
827 cmd->protocol_data = ops;
828
829 switch (cdb[0]) {
830 case READ_6:
831 sectors = transport_get_sectors_6(cdb);
832 cmd->t_task_lba = transport_lba_21(cdb);
833 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
834 cmd->execute_cmd = sbc_execute_rw;
835 break;
836 case READ_10:
837 sectors = transport_get_sectors_10(cdb);
838 cmd->t_task_lba = transport_lba_32(cdb);
839
840 if (sbc_check_dpofua(dev, cmd, cdb))
841 return TCM_INVALID_CDB_FIELD;
842
843 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
844 if (ret)
845 return ret;
846
847 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
848 cmd->execute_cmd = sbc_execute_rw;
849 break;
850 case READ_12:
851 sectors = transport_get_sectors_12(cdb);
852 cmd->t_task_lba = transport_lba_32(cdb);
853
854 if (sbc_check_dpofua(dev, cmd, cdb))
855 return TCM_INVALID_CDB_FIELD;
856
857 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
858 if (ret)
859 return ret;
860
861 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
862 cmd->execute_cmd = sbc_execute_rw;
863 break;
864 case READ_16:
865 sectors = transport_get_sectors_16(cdb);
866 cmd->t_task_lba = transport_lba_64(cdb);
867
868 if (sbc_check_dpofua(dev, cmd, cdb))
869 return TCM_INVALID_CDB_FIELD;
870
871 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
872 if (ret)
873 return ret;
874
875 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
876 cmd->execute_cmd = sbc_execute_rw;
877 break;
878 case WRITE_6:
879 sectors = transport_get_sectors_6(cdb);
880 cmd->t_task_lba = transport_lba_21(cdb);
881 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
882 cmd->execute_cmd = sbc_execute_rw;
883 break;
884 case WRITE_10:
885 case WRITE_VERIFY:
886 sectors = transport_get_sectors_10(cdb);
887 cmd->t_task_lba = transport_lba_32(cdb);
888
889 if (sbc_check_dpofua(dev, cmd, cdb))
890 return TCM_INVALID_CDB_FIELD;
891
892 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
893 if (ret)
894 return ret;
895
896 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
897 cmd->execute_cmd = sbc_execute_rw;
898 break;
899 case WRITE_12:
900 sectors = transport_get_sectors_12(cdb);
901 cmd->t_task_lba = transport_lba_32(cdb);
902
903 if (sbc_check_dpofua(dev, cmd, cdb))
904 return TCM_INVALID_CDB_FIELD;
905
906 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
907 if (ret)
908 return ret;
909
910 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
911 cmd->execute_cmd = sbc_execute_rw;
912 break;
913 case WRITE_16:
914 sectors = transport_get_sectors_16(cdb);
915 cmd->t_task_lba = transport_lba_64(cdb);
916
917 if (sbc_check_dpofua(dev, cmd, cdb))
918 return TCM_INVALID_CDB_FIELD;
919
920 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
921 if (ret)
922 return ret;
923
924 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
925 cmd->execute_cmd = sbc_execute_rw;
926 break;
927 case XDWRITEREAD_10:
928 if (cmd->data_direction != DMA_TO_DEVICE ||
929 !(cmd->se_cmd_flags & SCF_BIDI))
930 return TCM_INVALID_CDB_FIELD;
931 sectors = transport_get_sectors_10(cdb);
932
933 if (sbc_check_dpofua(dev, cmd, cdb))
934 return TCM_INVALID_CDB_FIELD;
935
936 cmd->t_task_lba = transport_lba_32(cdb);
937 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
938
939 /*
940 * Setup BIDI XOR callback to be run after I/O completion.
941 */
942 cmd->execute_cmd = sbc_execute_rw;
943 cmd->transport_complete_callback = &xdreadwrite_callback;
944 break;
945 case VARIABLE_LENGTH_CMD:
946 {
947 u16 service_action = get_unaligned_be16(&cdb[8]);
948 switch (service_action) {
949 case XDWRITEREAD_32:
950 sectors = transport_get_sectors_32(cdb);
951
952 if (sbc_check_dpofua(dev, cmd, cdb))
953 return TCM_INVALID_CDB_FIELD;
954 /*
955 * Use WRITE_32 and READ_32 opcodes for the emulated
956 * XDWRITE_READ_32 logic.
957 */
958 cmd->t_task_lba = transport_lba_64_ext(cdb);
959 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
960
961 /*
962 * Setup BIDI XOR callback to be run during after I/O
963 * completion.
964 */
965 cmd->execute_cmd = sbc_execute_rw;
966 cmd->transport_complete_callback = &xdreadwrite_callback;
967 break;
968 case WRITE_SAME_32:
969 sectors = transport_get_sectors_32(cdb);
970 if (!sectors) {
971 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
972 " supported\n");
973 return TCM_INVALID_CDB_FIELD;
974 }
975
976 size = sbc_get_size(cmd, 1);
977 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
978
979 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
980 if (ret)
981 return ret;
982 break;
983 default:
984 pr_err("VARIABLE_LENGTH_CMD service action"
985 " 0x%04x not supported\n", service_action);
986 return TCM_UNSUPPORTED_SCSI_OPCODE;
987 }
988 break;
989 }
990 case COMPARE_AND_WRITE:
991 sectors = cdb[13];
992 /*
993 * Currently enforce COMPARE_AND_WRITE for a single sector
994 */
995 if (sectors > 1) {
996 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
997 " than 1\n", sectors);
998 return TCM_INVALID_CDB_FIELD;
999 }
1000 if (sbc_check_dpofua(dev, cmd, cdb))
1001 return TCM_INVALID_CDB_FIELD;
1002
1003 /*
1004 * Double size because we have two buffers, note that
1005 * zero is not an error..
1006 */
1007 size = 2 * sbc_get_size(cmd, sectors);
1008 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1009 cmd->t_task_nolb = sectors;
1010 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
1011 cmd->execute_cmd = sbc_compare_and_write;
1012 cmd->transport_complete_callback = compare_and_write_callback;
1013 break;
1014 case READ_CAPACITY:
1015 size = READ_CAP_LEN;
1016 cmd->execute_cmd = sbc_emulate_readcapacity;
1017 break;
1018 case SERVICE_ACTION_IN_16:
1019 switch (cmd->t_task_cdb[1] & 0x1f) {
1020 case SAI_READ_CAPACITY_16:
1021 cmd->execute_cmd = sbc_emulate_readcapacity_16;
1022 break;
1023 case SAI_REPORT_REFERRALS:
1024 cmd->execute_cmd = target_emulate_report_referrals;
1025 break;
1026 default:
1027 pr_err("Unsupported SA: 0x%02x\n",
1028 cmd->t_task_cdb[1] & 0x1f);
1029 return TCM_INVALID_CDB_FIELD;
1030 }
1031 size = (cdb[10] << 24) | (cdb[11] << 16) |
1032 (cdb[12] << 8) | cdb[13];
1033 break;
1034 case SYNCHRONIZE_CACHE:
1035 case SYNCHRONIZE_CACHE_16:
1036 if (cdb[0] == SYNCHRONIZE_CACHE) {
1037 sectors = transport_get_sectors_10(cdb);
1038 cmd->t_task_lba = transport_lba_32(cdb);
1039 } else {
1040 sectors = transport_get_sectors_16(cdb);
1041 cmd->t_task_lba = transport_lba_64(cdb);
1042 }
1043 if (ops->execute_sync_cache) {
1044 cmd->execute_cmd = ops->execute_sync_cache;
1045 goto check_lba;
1046 }
1047 size = 0;
1048 cmd->execute_cmd = sbc_emulate_noop;
1049 break;
1050 case UNMAP:
1051 if (!ops->execute_unmap)
1052 return TCM_UNSUPPORTED_SCSI_OPCODE;
1053
1054 if (!dev->dev_attrib.emulate_tpu) {
1055 pr_err("Got UNMAP, but backend device has"
1056 " emulate_tpu disabled\n");
1057 return TCM_UNSUPPORTED_SCSI_OPCODE;
1058 }
1059 size = get_unaligned_be16(&cdb[7]);
1060 cmd->execute_cmd = sbc_execute_unmap;
1061 break;
1062 case WRITE_SAME_16:
1063 sectors = transport_get_sectors_16(cdb);
1064 if (!sectors) {
1065 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1066 return TCM_INVALID_CDB_FIELD;
1067 }
1068
1069 size = sbc_get_size(cmd, 1);
1070 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1071
1072 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1073 if (ret)
1074 return ret;
1075 break;
1076 case WRITE_SAME:
1077 sectors = transport_get_sectors_10(cdb);
1078 if (!sectors) {
1079 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1080 return TCM_INVALID_CDB_FIELD;
1081 }
1082
1083 size = sbc_get_size(cmd, 1);
1084 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1085
1086 /*
1087 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1088 * of byte 1 bit 3 UNMAP instead of original reserved field
1089 */
1090 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1091 if (ret)
1092 return ret;
1093 break;
1094 case VERIFY:
1095 size = 0;
1096 sectors = transport_get_sectors_10(cdb);
1097 cmd->t_task_lba = transport_lba_32(cdb);
1098 cmd->execute_cmd = sbc_emulate_noop;
1099 goto check_lba;
1100 case REZERO_UNIT:
1101 case SEEK_6:
1102 case SEEK_10:
1103 /*
1104 * There are still clients out there which use these old SCSI-2
1105 * commands. This mainly happens when running VMs with legacy
1106 * guest systems, connected via SCSI command pass-through to
1107 * iSCSI targets. Make them happy and return status GOOD.
1108 */
1109 size = 0;
1110 cmd->execute_cmd = sbc_emulate_noop;
1111 break;
1112 case START_STOP:
1113 size = 0;
1114 cmd->execute_cmd = sbc_emulate_startstop;
1115 break;
1116 default:
1117 ret = spc_parse_cdb(cmd, &size);
1118 if (ret)
1119 return ret;
1120 }
1121
1122 /* reject any command that we don't have a handler for */
1123 if (!cmd->execute_cmd)
1124 return TCM_UNSUPPORTED_SCSI_OPCODE;
1125
1126 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1127 unsigned long long end_lba;
1128 check_lba:
1129 end_lba = dev->transport->get_blocks(dev) + 1;
1130 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1131 ((cmd->t_task_lba + sectors) > end_lba)) {
1132 pr_err("cmd exceeds last lba %llu "
1133 "(lba %llu, sectors %u)\n",
1134 end_lba, cmd->t_task_lba, sectors);
1135 return TCM_ADDRESS_OUT_OF_RANGE;
1136 }
1137
1138 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1139 size = sbc_get_size(cmd, sectors);
1140 }
1141
1142 return target_cmd_size_check(cmd, size);
1143 }
1144 EXPORT_SYMBOL(sbc_parse_cdb);
1145
1146 u32 sbc_get_device_type(struct se_device *dev)
1147 {
1148 return TYPE_DISK;
1149 }
1150 EXPORT_SYMBOL(sbc_get_device_type);
1151
1152 static sense_reason_t
1153 sbc_execute_unmap(struct se_cmd *cmd)
1154 {
1155 struct sbc_ops *ops = cmd->protocol_data;
1156 struct se_device *dev = cmd->se_dev;
1157 unsigned char *buf, *ptr = NULL;
1158 sector_t lba;
1159 int size;
1160 u32 range;
1161 sense_reason_t ret = 0;
1162 int dl, bd_dl;
1163
1164 /* We never set ANC_SUP */
1165 if (cmd->t_task_cdb[1])
1166 return TCM_INVALID_CDB_FIELD;
1167
1168 if (cmd->data_length == 0) {
1169 target_complete_cmd(cmd, SAM_STAT_GOOD);
1170 return 0;
1171 }
1172
1173 if (cmd->data_length < 8) {
1174 pr_warn("UNMAP parameter list length %u too small\n",
1175 cmd->data_length);
1176 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1177 }
1178
1179 buf = transport_kmap_data_sg(cmd);
1180 if (!buf)
1181 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1182
1183 dl = get_unaligned_be16(&buf[0]);
1184 bd_dl = get_unaligned_be16(&buf[2]);
1185
1186 size = cmd->data_length - 8;
1187 if (bd_dl > size)
1188 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1189 cmd->data_length, bd_dl);
1190 else
1191 size = bd_dl;
1192
1193 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1194 ret = TCM_INVALID_PARAMETER_LIST;
1195 goto err;
1196 }
1197
1198 /* First UNMAP block descriptor starts at 8 byte offset */
1199 ptr = &buf[8];
1200 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1201 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1202
1203 while (size >= 16) {
1204 lba = get_unaligned_be64(&ptr[0]);
1205 range = get_unaligned_be32(&ptr[8]);
1206 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1207 (unsigned long long)lba, range);
1208
1209 if (range > dev->dev_attrib.max_unmap_lba_count) {
1210 ret = TCM_INVALID_PARAMETER_LIST;
1211 goto err;
1212 }
1213
1214 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1215 ret = TCM_ADDRESS_OUT_OF_RANGE;
1216 goto err;
1217 }
1218
1219 ret = ops->execute_unmap(cmd, lba, range);
1220 if (ret)
1221 goto err;
1222
1223 ptr += 16;
1224 size -= 16;
1225 }
1226
1227 err:
1228 transport_kunmap_data_sg(cmd);
1229 if (!ret)
1230 target_complete_cmd(cmd, GOOD);
1231 return ret;
1232 }
1233
1234 void
1235 sbc_dif_generate(struct se_cmd *cmd)
1236 {
1237 struct se_device *dev = cmd->se_dev;
1238 struct t10_pi_tuple *sdt;
1239 struct scatterlist *dsg = cmd->t_data_sg, *psg;
1240 sector_t sector = cmd->t_task_lba;
1241 void *daddr, *paddr;
1242 int i, j, offset = 0;
1243 unsigned int block_size = dev->dev_attrib.block_size;
1244
1245 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1246 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1247 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1248
1249 for (j = 0; j < psg->length;
1250 j += sizeof(*sdt)) {
1251 __u16 crc;
1252 unsigned int avail;
1253
1254 if (offset >= dsg->length) {
1255 offset -= dsg->length;
1256 kunmap_atomic(daddr - dsg->offset);
1257 dsg = sg_next(dsg);
1258 if (!dsg) {
1259 kunmap_atomic(paddr - psg->offset);
1260 return;
1261 }
1262 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1263 }
1264
1265 sdt = paddr + j;
1266 avail = min(block_size, dsg->length - offset);
1267 crc = crc_t10dif(daddr + offset, avail);
1268 if (avail < block_size) {
1269 kunmap_atomic(daddr - dsg->offset);
1270 dsg = sg_next(dsg);
1271 if (!dsg) {
1272 kunmap_atomic(paddr - psg->offset);
1273 return;
1274 }
1275 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1276 offset = block_size - avail;
1277 crc = crc_t10dif_update(crc, daddr, offset);
1278 } else {
1279 offset += block_size;
1280 }
1281
1282 sdt->guard_tag = cpu_to_be16(crc);
1283 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1284 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1285 sdt->app_tag = 0;
1286
1287 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1288 " app_tag: 0x%04x ref_tag: %u\n",
1289 (cmd->data_direction == DMA_TO_DEVICE) ?
1290 "WRITE" : "READ", (unsigned long long)sector,
1291 sdt->guard_tag, sdt->app_tag,
1292 be32_to_cpu(sdt->ref_tag));
1293
1294 sector++;
1295 }
1296
1297 kunmap_atomic(daddr - dsg->offset);
1298 kunmap_atomic(paddr - psg->offset);
1299 }
1300 }
1301
1302 static sense_reason_t
1303 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt,
1304 __u16 crc, sector_t sector, unsigned int ei_lba)
1305 {
1306 __be16 csum;
1307
1308 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1309 goto check_ref;
1310
1311 csum = cpu_to_be16(crc);
1312
1313 if (sdt->guard_tag != csum) {
1314 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1315 " csum 0x%04x\n", (unsigned long long)sector,
1316 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1317 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1318 }
1319
1320 check_ref:
1321 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1322 return 0;
1323
1324 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1325 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1326 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1327 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1328 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1329 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1330 }
1331
1332 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1333 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1334 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1335 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1336 be32_to_cpu(sdt->ref_tag), ei_lba);
1337 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1338 }
1339
1340 return 0;
1341 }
1342
1343 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1344 struct scatterlist *sg, int sg_off)
1345 {
1346 struct se_device *dev = cmd->se_dev;
1347 struct scatterlist *psg;
1348 void *paddr, *addr;
1349 unsigned int i, len, left;
1350 unsigned int offset = sg_off;
1351
1352 if (!sg)
1353 return;
1354
1355 left = sectors * dev->prot_length;
1356
1357 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1358 unsigned int psg_len, copied = 0;
1359
1360 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1361 psg_len = min(left, psg->length);
1362 while (psg_len) {
1363 len = min(psg_len, sg->length - offset);
1364 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1365
1366 if (read)
1367 memcpy(paddr + copied, addr, len);
1368 else
1369 memcpy(addr, paddr + copied, len);
1370
1371 left -= len;
1372 offset += len;
1373 copied += len;
1374 psg_len -= len;
1375
1376 kunmap_atomic(addr - sg->offset - offset);
1377
1378 if (offset >= sg->length) {
1379 sg = sg_next(sg);
1380 offset = 0;
1381 }
1382 }
1383 kunmap_atomic(paddr - psg->offset);
1384 }
1385 }
1386 EXPORT_SYMBOL(sbc_dif_copy_prot);
1387
1388 sense_reason_t
1389 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1390 unsigned int ei_lba, struct scatterlist *psg, int psg_off)
1391 {
1392 struct se_device *dev = cmd->se_dev;
1393 struct t10_pi_tuple *sdt;
1394 struct scatterlist *dsg = cmd->t_data_sg;
1395 sector_t sector = start;
1396 void *daddr, *paddr;
1397 int i;
1398 sense_reason_t rc;
1399 int dsg_off = 0;
1400 unsigned int block_size = dev->dev_attrib.block_size;
1401
1402 for (; psg && sector < start + sectors; psg = sg_next(psg)) {
1403 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1404 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1405
1406 for (i = psg_off; i < psg->length &&
1407 sector < start + sectors;
1408 i += sizeof(*sdt)) {
1409 __u16 crc;
1410 unsigned int avail;
1411
1412 if (dsg_off >= dsg->length) {
1413 dsg_off -= dsg->length;
1414 kunmap_atomic(daddr - dsg->offset);
1415 dsg = sg_next(dsg);
1416 if (!dsg) {
1417 kunmap_atomic(paddr - psg->offset);
1418 return 0;
1419 }
1420 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1421 }
1422
1423 sdt = paddr + i;
1424
1425 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1426 " app_tag: 0x%04x ref_tag: %u\n",
1427 (unsigned long long)sector, sdt->guard_tag,
1428 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1429
1430 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1431 dsg_off += block_size;
1432 goto next;
1433 }
1434
1435 avail = min(block_size, dsg->length - dsg_off);
1436 crc = crc_t10dif(daddr + dsg_off, avail);
1437 if (avail < block_size) {
1438 kunmap_atomic(daddr - dsg->offset);
1439 dsg = sg_next(dsg);
1440 if (!dsg) {
1441 kunmap_atomic(paddr - psg->offset);
1442 return 0;
1443 }
1444 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1445 dsg_off = block_size - avail;
1446 crc = crc_t10dif_update(crc, daddr, dsg_off);
1447 } else {
1448 dsg_off += block_size;
1449 }
1450
1451 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
1452 if (rc) {
1453 kunmap_atomic(daddr - dsg->offset);
1454 kunmap_atomic(paddr - psg->offset);
1455 cmd->bad_sector = sector;
1456 return rc;
1457 }
1458 next:
1459 sector++;
1460 ei_lba++;
1461 }
1462
1463 psg_off = 0;
1464 kunmap_atomic(daddr - dsg->offset);
1465 kunmap_atomic(paddr - psg->offset);
1466 }
1467
1468 return 0;
1469 }
1470 EXPORT_SYMBOL(sbc_dif_verify);
Linux with added FPC-III support