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target: Minimize SCSI header #include directives
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blob39a95ada371bc96dcf5f62c2d3affc87c17e7830
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
42 static sense_reason_t
43 sbc_emulate_readcapacity(struct se_cmd *cmd)
44 {
45 struct se_device *dev = cmd->se_dev;
46 unsigned char *cdb = cmd->t_task_cdb;
47 unsigned long long blocks_long = dev->transport->get_blocks(dev);
48 unsigned char *rbuf;
49 unsigned char buf[8];
50 u32 blocks;
51
52 /*
53 * SBC-2 says:
54 * If the PMI bit is set to zero and the LOGICAL BLOCK
55 * ADDRESS field is not set to zero, the device server shall
56 * terminate the command with CHECK CONDITION status with
57 * the sense key set to ILLEGAL REQUEST and the additional
58 * sense code set to INVALID FIELD IN CDB.
59 *
60 * In SBC-3, these fields are obsolete, but some SCSI
61 * compliance tests actually check this, so we might as well
62 * follow SBC-2.
63 */
64 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
65 return TCM_INVALID_CDB_FIELD;
66
67 if (blocks_long >= 0x00000000ffffffff)
68 blocks = 0xffffffff;
69 else
70 blocks = (u32)blocks_long;
71
72 buf[0] = (blocks >> 24) & 0xff;
73 buf[1] = (blocks >> 16) & 0xff;
74 buf[2] = (blocks >> 8) & 0xff;
75 buf[3] = blocks & 0xff;
76 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
77 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
78 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
79 buf[7] = dev->dev_attrib.block_size & 0xff;
80
81 rbuf = transport_kmap_data_sg(cmd);
82 if (rbuf) {
83 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
84 transport_kunmap_data_sg(cmd);
85 }
86
87 target_complete_cmd_with_length(cmd, GOOD, 8);
88 return 0;
89 }
90
91 static sense_reason_t
92 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
93 {
94 struct se_device *dev = cmd->se_dev;
95 struct se_session *sess = cmd->se_sess;
96 int pi_prot_type = dev->dev_attrib.pi_prot_type;
97
98 unsigned char *rbuf;
99 unsigned char buf[32];
100 unsigned long long blocks = dev->transport->get_blocks(dev);
101
102 memset(buf, 0, sizeof(buf));
103 buf[0] = (blocks >> 56) & 0xff;
104 buf[1] = (blocks >> 48) & 0xff;
105 buf[2] = (blocks >> 40) & 0xff;
106 buf[3] = (blocks >> 32) & 0xff;
107 buf[4] = (blocks >> 24) & 0xff;
108 buf[5] = (blocks >> 16) & 0xff;
109 buf[6] = (blocks >> 8) & 0xff;
110 buf[7] = blocks & 0xff;
111 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
112 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
113 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
114 buf[11] = dev->dev_attrib.block_size & 0xff;
115 /*
116 * Set P_TYPE and PROT_EN bits for DIF support
117 */
118 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
119 /*
120 * Only override a device's pi_prot_type if no T10-PI is
121 * available, and sess_prot_type has been explicitly enabled.
122 */
123 if (!pi_prot_type)
124 pi_prot_type = sess->sess_prot_type;
125
126 if (pi_prot_type)
127 buf[12] = (pi_prot_type - 1) << 1 | 0x1;
128 }
129
130 if (dev->transport->get_lbppbe)
131 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
132
133 if (dev->transport->get_alignment_offset_lbas) {
134 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
135 buf[14] = (lalba >> 8) & 0x3f;
136 buf[15] = lalba & 0xff;
137 }
138
139 /*
140 * Set Thin Provisioning Enable bit following sbc3r22 in section
141 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
142 */
143 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
144 buf[14] |= 0x80;
145
146 rbuf = transport_kmap_data_sg(cmd);
147 if (rbuf) {
148 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
149 transport_kunmap_data_sg(cmd);
150 }
151
152 target_complete_cmd_with_length(cmd, GOOD, 32);
153 return 0;
154 }
155
156 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
157 {
158 u32 num_blocks;
159
160 if (cmd->t_task_cdb[0] == WRITE_SAME)
161 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
162 else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
163 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
164 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
165 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
166
167 /*
168 * Use the explicit range when non zero is supplied, otherwise calculate
169 * the remaining range based on ->get_blocks() - starting LBA.
170 */
171 if (num_blocks)
172 return num_blocks;
173
174 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
175 cmd->t_task_lba + 1;
176 }
177 EXPORT_SYMBOL(sbc_get_write_same_sectors);
178
179 static sense_reason_t
180 sbc_emulate_noop(struct se_cmd *cmd)
181 {
182 target_complete_cmd(cmd, GOOD);
183 return 0;
184 }
185
186 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
187 {
188 return cmd->se_dev->dev_attrib.block_size * sectors;
189 }
190
191 static inline u32 transport_get_sectors_6(unsigned char *cdb)
192 {
193 /*
194 * Use 8-bit sector value. SBC-3 says:
195 *
196 * A TRANSFER LENGTH field set to zero specifies that 256
197 * logical blocks shall be written. Any other value
198 * specifies the number of logical blocks that shall be
199 * written.
200 */
201 return cdb[4] ? : 256;
202 }
203
204 static inline u32 transport_get_sectors_10(unsigned char *cdb)
205 {
206 return (u32)(cdb[7] << 8) + cdb[8];
207 }
208
209 static inline u32 transport_get_sectors_12(unsigned char *cdb)
210 {
211 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
212 }
213
214 static inline u32 transport_get_sectors_16(unsigned char *cdb)
215 {
216 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
217 (cdb[12] << 8) + cdb[13];
218 }
219
220 /*
221 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
222 */
223 static inline u32 transport_get_sectors_32(unsigned char *cdb)
224 {
225 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
226 (cdb[30] << 8) + cdb[31];
227
228 }
229
230 static inline u32 transport_lba_21(unsigned char *cdb)
231 {
232 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
233 }
234
235 static inline u32 transport_lba_32(unsigned char *cdb)
236 {
237 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
238 }
239
240 static inline unsigned long long transport_lba_64(unsigned char *cdb)
241 {
242 unsigned int __v1, __v2;
243
244 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
245 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
246
247 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
248 }
249
250 /*
251 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
252 */
253 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
254 {
255 unsigned int __v1, __v2;
256
257 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
258 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
259
260 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
261 }
262
263 static sense_reason_t
264 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
265 {
266 struct se_device *dev = cmd->se_dev;
267 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
268 unsigned int sectors = sbc_get_write_same_sectors(cmd);
269 sense_reason_t ret;
270
271 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
272 pr_err("WRITE_SAME PBDATA and LBDATA"
273 " bits not supported for Block Discard"
274 " Emulation\n");
275 return TCM_UNSUPPORTED_SCSI_OPCODE;
276 }
277 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
278 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
279 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
280 return TCM_INVALID_CDB_FIELD;
281 }
282 /*
283 * Sanity check for LBA wrap and request past end of device.
284 */
285 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
286 ((cmd->t_task_lba + sectors) > end_lba)) {
287 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
288 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
289 return TCM_ADDRESS_OUT_OF_RANGE;
290 }
291
292 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
293 if (flags[0] & 0x10) {
294 pr_warn("WRITE SAME with ANCHOR not supported\n");
295 return TCM_INVALID_CDB_FIELD;
296 }
297 /*
298 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
299 * translated into block discard requests within backend code.
300 */
301 if (flags[0] & 0x08) {
302 if (!ops->execute_write_same_unmap)
303 return TCM_UNSUPPORTED_SCSI_OPCODE;
304
305 if (!dev->dev_attrib.emulate_tpws) {
306 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
307 " has emulate_tpws disabled\n");
308 return TCM_UNSUPPORTED_SCSI_OPCODE;
309 }
310 cmd->execute_cmd = ops->execute_write_same_unmap;
311 return 0;
312 }
313 if (!ops->execute_write_same)
314 return TCM_UNSUPPORTED_SCSI_OPCODE;
315
316 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
317 if (ret)
318 return ret;
319
320 cmd->execute_cmd = ops->execute_write_same;
321 return 0;
322 }
323
324 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success)
325 {
326 unsigned char *buf, *addr;
327 struct scatterlist *sg;
328 unsigned int offset;
329 sense_reason_t ret = TCM_NO_SENSE;
330 int i, count;
331 /*
332 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
333 *
334 * 1) read the specified logical block(s);
335 * 2) transfer logical blocks from the data-out buffer;
336 * 3) XOR the logical blocks transferred from the data-out buffer with
337 * the logical blocks read, storing the resulting XOR data in a buffer;
338 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
339 * blocks transferred from the data-out buffer; and
340 * 5) transfer the resulting XOR data to the data-in buffer.
341 */
342 buf = kmalloc(cmd->data_length, GFP_KERNEL);
343 if (!buf) {
344 pr_err("Unable to allocate xor_callback buf\n");
345 return TCM_OUT_OF_RESOURCES;
346 }
347 /*
348 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
349 * into the locally allocated *buf
350 */
351 sg_copy_to_buffer(cmd->t_data_sg,
352 cmd->t_data_nents,
353 buf,
354 cmd->data_length);
355
356 /*
357 * Now perform the XOR against the BIDI read memory located at
358 * cmd->t_mem_bidi_list
359 */
360
361 offset = 0;
362 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
363 addr = kmap_atomic(sg_page(sg));
364 if (!addr) {
365 ret = TCM_OUT_OF_RESOURCES;
366 goto out;
367 }
368
369 for (i = 0; i < sg->length; i++)
370 *(addr + sg->offset + i) ^= *(buf + offset + i);
371
372 offset += sg->length;
373 kunmap_atomic(addr);
374 }
375
376 out:
377 kfree(buf);
378 return ret;
379 }
380
381 static sense_reason_t
382 sbc_execute_rw(struct se_cmd *cmd)
383 {
384 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
385 cmd->data_direction);
386 }
387
388 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success)
389 {
390 struct se_device *dev = cmd->se_dev;
391
392 /*
393 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
394 * within target_complete_ok_work() if the command was successfully
395 * sent to the backend driver.
396 */
397 spin_lock_irq(&cmd->t_state_lock);
398 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
399 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
400 spin_unlock_irq(&cmd->t_state_lock);
401
402 /*
403 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
404 * before the original READ I/O submission.
405 */
406 up(&dev->caw_sem);
407
408 return TCM_NO_SENSE;
409 }
410
411 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success)
412 {
413 struct se_device *dev = cmd->se_dev;
414 struct scatterlist *write_sg = NULL, *sg;
415 unsigned char *buf = NULL, *addr;
416 struct sg_mapping_iter m;
417 unsigned int offset = 0, len;
418 unsigned int nlbas = cmd->t_task_nolb;
419 unsigned int block_size = dev->dev_attrib.block_size;
420 unsigned int compare_len = (nlbas * block_size);
421 sense_reason_t ret = TCM_NO_SENSE;
422 int rc, i;
423
424 /*
425 * Handle early failure in transport_generic_request_failure(),
426 * which will not have taken ->caw_sem yet..
427 */
428 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
429 return TCM_NO_SENSE;
430 /*
431 * Handle special case for zero-length COMPARE_AND_WRITE
432 */
433 if (!cmd->data_length)
434 goto out;
435 /*
436 * Immediately exit + release dev->caw_sem if command has already
437 * been failed with a non-zero SCSI status.
438 */
439 if (cmd->scsi_status) {
440 pr_err("compare_and_write_callback: non zero scsi_status:"
441 " 0x%02x\n", cmd->scsi_status);
442 goto out;
443 }
444
445 buf = kzalloc(cmd->data_length, GFP_KERNEL);
446 if (!buf) {
447 pr_err("Unable to allocate compare_and_write buf\n");
448 ret = TCM_OUT_OF_RESOURCES;
449 goto out;
450 }
451
452 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
453 GFP_KERNEL);
454 if (!write_sg) {
455 pr_err("Unable to allocate compare_and_write sg\n");
456 ret = TCM_OUT_OF_RESOURCES;
457 goto out;
458 }
459 sg_init_table(write_sg, cmd->t_data_nents);
460 /*
461 * Setup verify and write data payloads from total NumberLBAs.
462 */
463 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
464 cmd->data_length);
465 if (!rc) {
466 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
467 ret = TCM_OUT_OF_RESOURCES;
468 goto out;
469 }
470 /*
471 * Compare against SCSI READ payload against verify payload
472 */
473 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
474 addr = (unsigned char *)kmap_atomic(sg_page(sg));
475 if (!addr) {
476 ret = TCM_OUT_OF_RESOURCES;
477 goto out;
478 }
479
480 len = min(sg->length, compare_len);
481
482 if (memcmp(addr, buf + offset, len)) {
483 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
484 addr, buf + offset);
485 kunmap_atomic(addr);
486 goto miscompare;
487 }
488 kunmap_atomic(addr);
489
490 offset += len;
491 compare_len -= len;
492 if (!compare_len)
493 break;
494 }
495
496 i = 0;
497 len = cmd->t_task_nolb * block_size;
498 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
499 /*
500 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
501 */
502 while (len) {
503 sg_miter_next(&m);
504
505 if (block_size < PAGE_SIZE) {
506 sg_set_page(&write_sg[i], m.page, block_size,
507 block_size);
508 } else {
509 sg_miter_next(&m);
510 sg_set_page(&write_sg[i], m.page, block_size,
511 0);
512 }
513 len -= block_size;
514 i++;
515 }
516 sg_miter_stop(&m);
517 /*
518 * Save the original SGL + nents values before updating to new
519 * assignments, to be released in transport_free_pages() ->
520 * transport_reset_sgl_orig()
521 */
522 cmd->t_data_sg_orig = cmd->t_data_sg;
523 cmd->t_data_sg = write_sg;
524 cmd->t_data_nents_orig = cmd->t_data_nents;
525 cmd->t_data_nents = 1;
526
527 cmd->sam_task_attr = TCM_HEAD_TAG;
528 cmd->transport_complete_callback = compare_and_write_post;
529 /*
530 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
531 * for submitting the adjusted SGL to write instance user-data.
532 */
533 cmd->execute_cmd = sbc_execute_rw;
534
535 spin_lock_irq(&cmd->t_state_lock);
536 cmd->t_state = TRANSPORT_PROCESSING;
537 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
538 spin_unlock_irq(&cmd->t_state_lock);
539
540 __target_execute_cmd(cmd);
541
542 kfree(buf);
543 return ret;
544
545 miscompare:
546 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
547 dev->transport->name);
548 ret = TCM_MISCOMPARE_VERIFY;
549 out:
550 /*
551 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
552 * sbc_compare_and_write() before the original READ I/O submission.
553 */
554 up(&dev->caw_sem);
555 kfree(write_sg);
556 kfree(buf);
557 return ret;
558 }
559
560 static sense_reason_t
561 sbc_compare_and_write(struct se_cmd *cmd)
562 {
563 struct se_device *dev = cmd->se_dev;
564 sense_reason_t ret;
565 int rc;
566 /*
567 * Submit the READ first for COMPARE_AND_WRITE to perform the
568 * comparision using SGLs at cmd->t_bidi_data_sg..
569 */
570 rc = down_interruptible(&dev->caw_sem);
571 if ((rc != 0) || signal_pending(current)) {
572 cmd->transport_complete_callback = NULL;
573 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
574 }
575 /*
576 * Reset cmd->data_length to individual block_size in order to not
577 * confuse backend drivers that depend on this value matching the
578 * size of the I/O being submitted.
579 */
580 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
581
582 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
583 DMA_FROM_DEVICE);
584 if (ret) {
585 cmd->transport_complete_callback = NULL;
586 up(&dev->caw_sem);
587 return ret;
588 }
589 /*
590 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
591 * upon MISCOMPARE, or in compare_and_write_done() upon completion
592 * of WRITE instance user-data.
593 */
594 return TCM_NO_SENSE;
595 }
596
597 static int
598 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
599 bool is_write, struct se_cmd *cmd)
600 {
601 if (is_write) {
602 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
603 protect ? TARGET_PROT_DOUT_PASS :
604 TARGET_PROT_DOUT_INSERT;
605 switch (protect) {
606 case 0x0:
607 case 0x3:
608 cmd->prot_checks = 0;
609 break;
610 case 0x1:
611 case 0x5:
612 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
613 if (prot_type == TARGET_DIF_TYPE1_PROT)
614 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
615 break;
616 case 0x2:
617 if (prot_type == TARGET_DIF_TYPE1_PROT)
618 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
619 break;
620 case 0x4:
621 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
622 break;
623 default:
624 pr_err("Unsupported protect field %d\n", protect);
625 return -EINVAL;
626 }
627 } else {
628 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
629 protect ? TARGET_PROT_DIN_PASS :
630 TARGET_PROT_DIN_STRIP;
631 switch (protect) {
632 case 0x0:
633 case 0x1:
634 case 0x5:
635 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
636 if (prot_type == TARGET_DIF_TYPE1_PROT)
637 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
638 break;
639 case 0x2:
640 if (prot_type == TARGET_DIF_TYPE1_PROT)
641 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
642 break;
643 case 0x3:
644 cmd->prot_checks = 0;
645 break;
646 case 0x4:
647 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
648 break;
649 default:
650 pr_err("Unsupported protect field %d\n", protect);
651 return -EINVAL;
652 }
653 }
654
655 return 0;
656 }
657
658 static sense_reason_t
659 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
660 u32 sectors, bool is_write)
661 {
662 u8 protect = cdb[1] >> 5;
663 int sp_ops = cmd->se_sess->sup_prot_ops;
664 int pi_prot_type = dev->dev_attrib.pi_prot_type;
665 bool fabric_prot = false;
666
667 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
668 if (unlikely(protect &&
669 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
670 pr_err("CDB contains protect bit, but device + fabric does"
671 " not advertise PROTECT=1 feature bit\n");
672 return TCM_INVALID_CDB_FIELD;
673 }
674 if (cmd->prot_pto)
675 return TCM_NO_SENSE;
676 }
677
678 switch (dev->dev_attrib.pi_prot_type) {
679 case TARGET_DIF_TYPE3_PROT:
680 cmd->reftag_seed = 0xffffffff;
681 break;
682 case TARGET_DIF_TYPE2_PROT:
683 if (protect)
684 return TCM_INVALID_CDB_FIELD;
685
686 cmd->reftag_seed = cmd->t_task_lba;
687 break;
688 case TARGET_DIF_TYPE1_PROT:
689 cmd->reftag_seed = cmd->t_task_lba;
690 break;
691 case TARGET_DIF_TYPE0_PROT:
692 /*
693 * See if the fabric supports T10-PI, and the session has been
694 * configured to allow export PROTECT=1 feature bit with backend
695 * devices that don't support T10-PI.
696 */
697 fabric_prot = is_write ?
698 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
699 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
700
701 if (fabric_prot && cmd->se_sess->sess_prot_type) {
702 pi_prot_type = cmd->se_sess->sess_prot_type;
703 break;
704 }
705 if (!protect)
706 return TCM_NO_SENSE;
707 /* Fallthrough */
708 default:
709 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
710 "PROTECT: 0x%02x\n", cdb[0], protect);
711 return TCM_INVALID_CDB_FIELD;
712 }
713
714 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
715 return TCM_INVALID_CDB_FIELD;
716
717 cmd->prot_type = pi_prot_type;
718 cmd->prot_length = dev->prot_length * sectors;
719
720 /**
721 * In case protection information exists over the wire
722 * we modify command data length to describe pure data.
723 * The actual transfer length is data length + protection
724 * length
725 **/
726 if (protect)
727 cmd->data_length = sectors * dev->dev_attrib.block_size;
728
729 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
730 "prot_op=%d prot_checks=%d\n",
731 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
732 cmd->prot_op, cmd->prot_checks);
733
734 return TCM_NO_SENSE;
735 }
736
737 static int
738 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
739 {
740 if (cdb[1] & 0x10) {
741 if (!dev->dev_attrib.emulate_dpo) {
742 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
743 " does not advertise support for DPO\n", cdb[0]);
744 return -EINVAL;
745 }
746 }
747 if (cdb[1] & 0x8) {
748 if (!dev->dev_attrib.emulate_fua_write || !se_dev_check_wce(dev)) {
749 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
750 " does not advertise support for FUA write\n",
751 cdb[0]);
752 return -EINVAL;
753 }
754 cmd->se_cmd_flags |= SCF_FUA;
755 }
756 return 0;
757 }
758
759 sense_reason_t
760 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
761 {
762 struct se_device *dev = cmd->se_dev;
763 unsigned char *cdb = cmd->t_task_cdb;
764 unsigned int size;
765 u32 sectors = 0;
766 sense_reason_t ret;
767
768 switch (cdb[0]) {
769 case READ_6:
770 sectors = transport_get_sectors_6(cdb);
771 cmd->t_task_lba = transport_lba_21(cdb);
772 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
773 cmd->execute_rw = ops->execute_rw;
774 cmd->execute_cmd = sbc_execute_rw;
775 break;
776 case READ_10:
777 sectors = transport_get_sectors_10(cdb);
778 cmd->t_task_lba = transport_lba_32(cdb);
779
780 if (sbc_check_dpofua(dev, cmd, cdb))
781 return TCM_INVALID_CDB_FIELD;
782
783 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
784 if (ret)
785 return ret;
786
787 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
788 cmd->execute_rw = ops->execute_rw;
789 cmd->execute_cmd = sbc_execute_rw;
790 break;
791 case READ_12:
792 sectors = transport_get_sectors_12(cdb);
793 cmd->t_task_lba = transport_lba_32(cdb);
794
795 if (sbc_check_dpofua(dev, cmd, cdb))
796 return TCM_INVALID_CDB_FIELD;
797
798 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
799 if (ret)
800 return ret;
801
802 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
803 cmd->execute_rw = ops->execute_rw;
804 cmd->execute_cmd = sbc_execute_rw;
805 break;
806 case READ_16:
807 sectors = transport_get_sectors_16(cdb);
808 cmd->t_task_lba = transport_lba_64(cdb);
809
810 if (sbc_check_dpofua(dev, cmd, cdb))
811 return TCM_INVALID_CDB_FIELD;
812
813 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
814 if (ret)
815 return ret;
816
817 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
818 cmd->execute_rw = ops->execute_rw;
819 cmd->execute_cmd = sbc_execute_rw;
820 break;
821 case WRITE_6:
822 sectors = transport_get_sectors_6(cdb);
823 cmd->t_task_lba = transport_lba_21(cdb);
824 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
825 cmd->execute_rw = ops->execute_rw;
826 cmd->execute_cmd = sbc_execute_rw;
827 break;
828 case WRITE_10:
829 case WRITE_VERIFY:
830 sectors = transport_get_sectors_10(cdb);
831 cmd->t_task_lba = transport_lba_32(cdb);
832
833 if (sbc_check_dpofua(dev, cmd, cdb))
834 return TCM_INVALID_CDB_FIELD;
835
836 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
837 if (ret)
838 return ret;
839
840 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
841 cmd->execute_rw = ops->execute_rw;
842 cmd->execute_cmd = sbc_execute_rw;
843 break;
844 case WRITE_12:
845 sectors = transport_get_sectors_12(cdb);
846 cmd->t_task_lba = transport_lba_32(cdb);
847
848 if (sbc_check_dpofua(dev, cmd, cdb))
849 return TCM_INVALID_CDB_FIELD;
850
851 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
852 if (ret)
853 return ret;
854
855 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
856 cmd->execute_rw = ops->execute_rw;
857 cmd->execute_cmd = sbc_execute_rw;
858 break;
859 case WRITE_16:
860 sectors = transport_get_sectors_16(cdb);
861 cmd->t_task_lba = transport_lba_64(cdb);
862
863 if (sbc_check_dpofua(dev, cmd, cdb))
864 return TCM_INVALID_CDB_FIELD;
865
866 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
867 if (ret)
868 return ret;
869
870 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
871 cmd->execute_rw = ops->execute_rw;
872 cmd->execute_cmd = sbc_execute_rw;
873 break;
874 case XDWRITEREAD_10:
875 if (cmd->data_direction != DMA_TO_DEVICE ||
876 !(cmd->se_cmd_flags & SCF_BIDI))
877 return TCM_INVALID_CDB_FIELD;
878 sectors = transport_get_sectors_10(cdb);
879
880 if (sbc_check_dpofua(dev, cmd, cdb))
881 return TCM_INVALID_CDB_FIELD;
882
883 cmd->t_task_lba = transport_lba_32(cdb);
884 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
885
886 /*
887 * Setup BIDI XOR callback to be run after I/O completion.
888 */
889 cmd->execute_rw = ops->execute_rw;
890 cmd->execute_cmd = sbc_execute_rw;
891 cmd->transport_complete_callback = &xdreadwrite_callback;
892 break;
893 case VARIABLE_LENGTH_CMD:
894 {
895 u16 service_action = get_unaligned_be16(&cdb[8]);
896 switch (service_action) {
897 case XDWRITEREAD_32:
898 sectors = transport_get_sectors_32(cdb);
899
900 if (sbc_check_dpofua(dev, cmd, cdb))
901 return TCM_INVALID_CDB_FIELD;
902 /*
903 * Use WRITE_32 and READ_32 opcodes for the emulated
904 * XDWRITE_READ_32 logic.
905 */
906 cmd->t_task_lba = transport_lba_64_ext(cdb);
907 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
908
909 /*
910 * Setup BIDI XOR callback to be run during after I/O
911 * completion.
912 */
913 cmd->execute_rw = ops->execute_rw;
914 cmd->execute_cmd = sbc_execute_rw;
915 cmd->transport_complete_callback = &xdreadwrite_callback;
916 break;
917 case WRITE_SAME_32:
918 sectors = transport_get_sectors_32(cdb);
919 if (!sectors) {
920 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
921 " supported\n");
922 return TCM_INVALID_CDB_FIELD;
923 }
924
925 size = sbc_get_size(cmd, 1);
926 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
927
928 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
929 if (ret)
930 return ret;
931 break;
932 default:
933 pr_err("VARIABLE_LENGTH_CMD service action"
934 " 0x%04x not supported\n", service_action);
935 return TCM_UNSUPPORTED_SCSI_OPCODE;
936 }
937 break;
938 }
939 case COMPARE_AND_WRITE:
940 sectors = cdb[13];
941 /*
942 * Currently enforce COMPARE_AND_WRITE for a single sector
943 */
944 if (sectors > 1) {
945 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
946 " than 1\n", sectors);
947 return TCM_INVALID_CDB_FIELD;
948 }
949 /*
950 * Double size because we have two buffers, note that
951 * zero is not an error..
952 */
953 size = 2 * sbc_get_size(cmd, sectors);
954 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
955 cmd->t_task_nolb = sectors;
956 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
957 cmd->execute_rw = ops->execute_rw;
958 cmd->execute_cmd = sbc_compare_and_write;
959 cmd->transport_complete_callback = compare_and_write_callback;
960 break;
961 case READ_CAPACITY:
962 size = READ_CAP_LEN;
963 cmd->execute_cmd = sbc_emulate_readcapacity;
964 break;
965 case SERVICE_ACTION_IN_16:
966 switch (cmd->t_task_cdb[1] & 0x1f) {
967 case SAI_READ_CAPACITY_16:
968 cmd->execute_cmd = sbc_emulate_readcapacity_16;
969 break;
970 case SAI_REPORT_REFERRALS:
971 cmd->execute_cmd = target_emulate_report_referrals;
972 break;
973 default:
974 pr_err("Unsupported SA: 0x%02x\n",
975 cmd->t_task_cdb[1] & 0x1f);
976 return TCM_INVALID_CDB_FIELD;
977 }
978 size = (cdb[10] << 24) | (cdb[11] << 16) |
979 (cdb[12] << 8) | cdb[13];
980 break;
981 case SYNCHRONIZE_CACHE:
982 case SYNCHRONIZE_CACHE_16:
983 if (cdb[0] == SYNCHRONIZE_CACHE) {
984 sectors = transport_get_sectors_10(cdb);
985 cmd->t_task_lba = transport_lba_32(cdb);
986 } else {
987 sectors = transport_get_sectors_16(cdb);
988 cmd->t_task_lba = transport_lba_64(cdb);
989 }
990 if (ops->execute_sync_cache) {
991 cmd->execute_cmd = ops->execute_sync_cache;
992 goto check_lba;
993 }
994 size = 0;
995 cmd->execute_cmd = sbc_emulate_noop;
996 break;
997 case UNMAP:
998 if (!ops->execute_unmap)
999 return TCM_UNSUPPORTED_SCSI_OPCODE;
1000
1001 if (!dev->dev_attrib.emulate_tpu) {
1002 pr_err("Got UNMAP, but backend device has"
1003 " emulate_tpu disabled\n");
1004 return TCM_UNSUPPORTED_SCSI_OPCODE;
1005 }
1006 size = get_unaligned_be16(&cdb[7]);
1007 cmd->execute_cmd = ops->execute_unmap;
1008 break;
1009 case WRITE_SAME_16:
1010 sectors = transport_get_sectors_16(cdb);
1011 if (!sectors) {
1012 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1013 return TCM_INVALID_CDB_FIELD;
1014 }
1015
1016 size = sbc_get_size(cmd, 1);
1017 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1018
1019 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1020 if (ret)
1021 return ret;
1022 break;
1023 case WRITE_SAME:
1024 sectors = transport_get_sectors_10(cdb);
1025 if (!sectors) {
1026 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1027 return TCM_INVALID_CDB_FIELD;
1028 }
1029
1030 size = sbc_get_size(cmd, 1);
1031 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1032
1033 /*
1034 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1035 * of byte 1 bit 3 UNMAP instead of original reserved field
1036 */
1037 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1038 if (ret)
1039 return ret;
1040 break;
1041 case VERIFY:
1042 size = 0;
1043 sectors = transport_get_sectors_10(cdb);
1044 cmd->t_task_lba = transport_lba_32(cdb);
1045 cmd->execute_cmd = sbc_emulate_noop;
1046 goto check_lba;
1047 case REZERO_UNIT:
1048 case SEEK_6:
1049 case SEEK_10:
1050 /*
1051 * There are still clients out there which use these old SCSI-2
1052 * commands. This mainly happens when running VMs with legacy
1053 * guest systems, connected via SCSI command pass-through to
1054 * iSCSI targets. Make them happy and return status GOOD.
1055 */
1056 size = 0;
1057 cmd->execute_cmd = sbc_emulate_noop;
1058 break;
1059 default:
1060 ret = spc_parse_cdb(cmd, &size);
1061 if (ret)
1062 return ret;
1063 }
1064
1065 /* reject any command that we don't have a handler for */
1066 if (!cmd->execute_cmd)
1067 return TCM_UNSUPPORTED_SCSI_OPCODE;
1068
1069 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1070 unsigned long long end_lba;
1071 check_lba:
1072 end_lba = dev->transport->get_blocks(dev) + 1;
1073 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1074 ((cmd->t_task_lba + sectors) > end_lba)) {
1075 pr_err("cmd exceeds last lba %llu "
1076 "(lba %llu, sectors %u)\n",
1077 end_lba, cmd->t_task_lba, sectors);
1078 return TCM_ADDRESS_OUT_OF_RANGE;
1079 }
1080
1081 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1082 size = sbc_get_size(cmd, sectors);
1083 }
1084
1085 return target_cmd_size_check(cmd, size);
1086 }
1087 EXPORT_SYMBOL(sbc_parse_cdb);
1088
1089 u32 sbc_get_device_type(struct se_device *dev)
1090 {
1091 return TYPE_DISK;
1092 }
1093 EXPORT_SYMBOL(sbc_get_device_type);
1094
1095 sense_reason_t
1096 sbc_execute_unmap(struct se_cmd *cmd,
1097 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
1098 sector_t, sector_t),
1099 void *priv)
1100 {
1101 struct se_device *dev = cmd->se_dev;
1102 unsigned char *buf, *ptr = NULL;
1103 sector_t lba;
1104 int size;
1105 u32 range;
1106 sense_reason_t ret = 0;
1107 int dl, bd_dl;
1108
1109 /* We never set ANC_SUP */
1110 if (cmd->t_task_cdb[1])
1111 return TCM_INVALID_CDB_FIELD;
1112
1113 if (cmd->data_length == 0) {
1114 target_complete_cmd(cmd, SAM_STAT_GOOD);
1115 return 0;
1116 }
1117
1118 if (cmd->data_length < 8) {
1119 pr_warn("UNMAP parameter list length %u too small\n",
1120 cmd->data_length);
1121 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1122 }
1123
1124 buf = transport_kmap_data_sg(cmd);
1125 if (!buf)
1126 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1127
1128 dl = get_unaligned_be16(&buf[0]);
1129 bd_dl = get_unaligned_be16(&buf[2]);
1130
1131 size = cmd->data_length - 8;
1132 if (bd_dl > size)
1133 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1134 cmd->data_length, bd_dl);
1135 else
1136 size = bd_dl;
1137
1138 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1139 ret = TCM_INVALID_PARAMETER_LIST;
1140 goto err;
1141 }
1142
1143 /* First UNMAP block descriptor starts at 8 byte offset */
1144 ptr = &buf[8];
1145 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1146 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1147
1148 while (size >= 16) {
1149 lba = get_unaligned_be64(&ptr[0]);
1150 range = get_unaligned_be32(&ptr[8]);
1151 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1152 (unsigned long long)lba, range);
1153
1154 if (range > dev->dev_attrib.max_unmap_lba_count) {
1155 ret = TCM_INVALID_PARAMETER_LIST;
1156 goto err;
1157 }
1158
1159 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1160 ret = TCM_ADDRESS_OUT_OF_RANGE;
1161 goto err;
1162 }
1163
1164 ret = do_unmap_fn(cmd, priv, lba, range);
1165 if (ret)
1166 goto err;
1167
1168 ptr += 16;
1169 size -= 16;
1170 }
1171
1172 err:
1173 transport_kunmap_data_sg(cmd);
1174 if (!ret)
1175 target_complete_cmd(cmd, GOOD);
1176 return ret;
1177 }
1178 EXPORT_SYMBOL(sbc_execute_unmap);
1179
1180 void
1181 sbc_dif_generate(struct se_cmd *cmd)
1182 {
1183 struct se_device *dev = cmd->se_dev;
1184 struct se_dif_v1_tuple *sdt;
1185 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1186 sector_t sector = cmd->t_task_lba;
1187 void *daddr, *paddr;
1188 int i, j, offset = 0;
1189
1190 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1191 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1192 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1193
1194 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1195
1196 if (offset >= psg->length) {
1197 kunmap_atomic(paddr);
1198 psg = sg_next(psg);
1199 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1200 offset = 0;
1201 }
1202
1203 sdt = paddr + offset;
1204 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1205 dev->dev_attrib.block_size));
1206 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1207 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1208 sdt->app_tag = 0;
1209
1210 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1211 " app_tag: 0x%04x ref_tag: %u\n",
1212 (cmd->data_direction == DMA_TO_DEVICE) ?
1213 "WRITE" : "READ", (unsigned long long)sector,
1214 sdt->guard_tag, sdt->app_tag,
1215 be32_to_cpu(sdt->ref_tag));
1216
1217 sector++;
1218 offset += sizeof(struct se_dif_v1_tuple);
1219 }
1220
1221 kunmap_atomic(paddr);
1222 kunmap_atomic(daddr);
1223 }
1224 }
1225
1226 static sense_reason_t
1227 sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt,
1228 const void *p, sector_t sector, unsigned int ei_lba)
1229 {
1230 struct se_device *dev = cmd->se_dev;
1231 int block_size = dev->dev_attrib.block_size;
1232 __be16 csum;
1233
1234 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1235 goto check_ref;
1236
1237 csum = cpu_to_be16(crc_t10dif(p, block_size));
1238
1239 if (sdt->guard_tag != csum) {
1240 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1241 " csum 0x%04x\n", (unsigned long long)sector,
1242 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1243 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1244 }
1245
1246 check_ref:
1247 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1248 return 0;
1249
1250 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1251 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1252 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1253 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1254 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1255 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1256 }
1257
1258 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1259 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1260 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1261 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1262 be32_to_cpu(sdt->ref_tag), ei_lba);
1263 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1264 }
1265
1266 return 0;
1267 }
1268
1269 static void
1270 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1271 struct scatterlist *sg, int sg_off)
1272 {
1273 struct se_device *dev = cmd->se_dev;
1274 struct scatterlist *psg;
1275 void *paddr, *addr;
1276 unsigned int i, len, left;
1277 unsigned int offset = sg_off;
1278
1279 if (!sg)
1280 return;
1281
1282 left = sectors * dev->prot_length;
1283
1284 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1285 unsigned int psg_len, copied = 0;
1286
1287 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1288 psg_len = min(left, psg->length);
1289 while (psg_len) {
1290 len = min(psg_len, sg->length - offset);
1291 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1292
1293 if (read)
1294 memcpy(paddr + copied, addr, len);
1295 else
1296 memcpy(addr, paddr + copied, len);
1297
1298 left -= len;
1299 offset += len;
1300 copied += len;
1301 psg_len -= len;
1302
1303 if (offset >= sg->length) {
1304 sg = sg_next(sg);
1305 offset = 0;
1306 }
1307 kunmap_atomic(addr);
1308 }
1309 kunmap_atomic(paddr);
1310 }
1311 }
1312
1313 sense_reason_t
1314 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1315 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1316 {
1317 struct se_device *dev = cmd->se_dev;
1318 struct se_dif_v1_tuple *sdt;
1319 struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1320 sector_t sector = start;
1321 void *daddr, *paddr;
1322 int i, j, offset = 0;
1323 sense_reason_t rc;
1324
1325 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1326 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1327 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1328
1329 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1330
1331 if (offset >= psg->length) {
1332 kunmap_atomic(paddr);
1333 psg = sg_next(psg);
1334 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1335 offset = 0;
1336 }
1337
1338 sdt = paddr + offset;
1339
1340 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1341 " app_tag: 0x%04x ref_tag: %u\n",
1342 (unsigned long long)sector, sdt->guard_tag,
1343 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1344
1345 rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector,
1346 ei_lba);
1347 if (rc) {
1348 kunmap_atomic(paddr);
1349 kunmap_atomic(daddr);
1350 cmd->bad_sector = sector;
1351 return rc;
1352 }
1353
1354 sector++;
1355 ei_lba++;
1356 offset += sizeof(struct se_dif_v1_tuple);
1357 }
1358
1359 kunmap_atomic(paddr);
1360 kunmap_atomic(daddr);
1361 }
1362 if (!sg)
1363 return 0;
1364
1365 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1366
1367 return 0;
1368 }
1369 EXPORT_SYMBOL(sbc_dif_verify_write);
1370
1371 static sense_reason_t
1372 __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1373 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1374 {
1375 struct se_device *dev = cmd->se_dev;
1376 struct se_dif_v1_tuple *sdt;
1377 struct scatterlist *dsg, *psg = sg;
1378 sector_t sector = start;
1379 void *daddr, *paddr;
1380 int i, j, offset = sg_off;
1381 sense_reason_t rc;
1382
1383 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1384 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1385 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
1386
1387 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1388
1389 if (offset >= psg->length) {
1390 kunmap_atomic(paddr);
1391 psg = sg_next(psg);
1392 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1393 offset = 0;
1394 }
1395
1396 sdt = paddr + offset;
1397
1398 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1399 " app_tag: 0x%04x ref_tag: %u\n",
1400 (unsigned long long)sector, sdt->guard_tag,
1401 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1402
1403 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1404 sector++;
1405 offset += sizeof(struct se_dif_v1_tuple);
1406 continue;
1407 }
1408
1409 rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector,
1410 ei_lba);
1411 if (rc) {
1412 kunmap_atomic(paddr);
1413 kunmap_atomic(daddr);
1414 cmd->bad_sector = sector;
1415 return rc;
1416 }
1417
1418 sector++;
1419 ei_lba++;
1420 offset += sizeof(struct se_dif_v1_tuple);
1421 }
1422
1423 kunmap_atomic(paddr);
1424 kunmap_atomic(daddr);
1425 }
1426
1427 return 0;
1428 }
1429
1430 sense_reason_t
1431 sbc_dif_read_strip(struct se_cmd *cmd)
1432 {
1433 struct se_device *dev = cmd->se_dev;
1434 u32 sectors = cmd->prot_length / dev->prot_length;
1435
1436 return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1437 cmd->t_prot_sg, 0);
1438 }
1439
1440 sense_reason_t
1441 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1442 unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1443 {
1444 sense_reason_t rc;
1445
1446 rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1447 if (rc)
1448 return rc;
1449
1450 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1451 return 0;
1452 }
1453 EXPORT_SYMBOL(sbc_dif_verify_read);
Linux with added FPC-III support