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
sbc_emulate_readcapacity(struct se_cmd * cmd)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
sbc_emulate_readcapacity_16(struct se_cmd * cmd)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
sbc_emulate_startstop(struct se_cmd * cmd)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
sbc_get_write_same_sectors(struct se_cmd * cmd)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
sbc_execute_write_same_unmap(struct se_cmd * cmd)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
sbc_emulate_noop(struct se_cmd * cmd)230 sbc_emulate_noop(struct se_cmd *cmd)
231 {
232 target_complete_cmd(cmd, GOOD);
233 return 0;
234 }
235
sbc_get_size(struct se_cmd * cmd,u32 sectors)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
transport_get_sectors_6(unsigned char * cdb)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
transport_get_sectors_10(unsigned char * cdb)254 static inline u32 transport_get_sectors_10(unsigned char *cdb)
255 {
256 return (u32)(cdb[7] << 8) + cdb[8];
257 }
258
transport_get_sectors_12(unsigned char * cdb)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
transport_get_sectors_16(unsigned char * cdb)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 */
transport_get_sectors_32(unsigned char * cdb)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
transport_lba_21(unsigned char * cdb)280 static inline u32 transport_lba_21(unsigned char *cdb)
281 {
282 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
283 }
284
transport_lba_32(unsigned char * cdb)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
transport_lba_64(unsigned char * cdb)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 */
transport_lba_64_ext(unsigned char * cdb)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
sbc_setup_write_same(struct se_cmd * cmd,unsigned char flags,struct sbc_ops * ops)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 & 0x04) || (flags & 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 & 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 & 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, flags >> 5, sectors, true);
367 if (ret)
368 return ret;
369
370 cmd->execute_cmd = ops->execute_write_same;
371 return 0;
372 }
373
xdreadwrite_callback(struct se_cmd * cmd,bool success,int * post_ret)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
sbc_execute_rw(struct se_cmd * cmd)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
compare_and_write_post(struct se_cmd * cmd,bool success,int * post_ret)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 sense_reason_t ret = TCM_NO_SENSE;
446
447 /*
448 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
449 * within target_complete_ok_work() if the command was successfully
450 * sent to the backend driver.
451 */
452 spin_lock_irq(&cmd->t_state_lock);
453 if (cmd->transport_state & CMD_T_SENT) {
454 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
455 *post_ret = 1;
456
457 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
458 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
459 }
460 spin_unlock_irq(&cmd->t_state_lock);
461
462 /*
463 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
464 * before the original READ I/O submission.
465 */
466 up(&dev->caw_sem);
467
468 return ret;
469 }
470
compare_and_write_callback(struct se_cmd * cmd,bool success,int * post_ret)471 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
472 int *post_ret)
473 {
474 struct se_device *dev = cmd->se_dev;
475 struct scatterlist *write_sg = NULL, *sg;
476 unsigned char *buf = NULL, *addr;
477 struct sg_mapping_iter m;
478 unsigned int offset = 0, len;
479 unsigned int nlbas = cmd->t_task_nolb;
480 unsigned int block_size = dev->dev_attrib.block_size;
481 unsigned int compare_len = (nlbas * block_size);
482 sense_reason_t ret = TCM_NO_SENSE;
483 int rc, i;
484
485 /*
486 * Handle early failure in transport_generic_request_failure(),
487 * which will not have taken ->caw_sem yet..
488 */
489 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
490 return TCM_NO_SENSE;
491 /*
492 * Handle special case for zero-length COMPARE_AND_WRITE
493 */
494 if (!cmd->data_length)
495 goto out;
496 /*
497 * Immediately exit + release dev->caw_sem if command has already
498 * been failed with a non-zero SCSI status.
499 */
500 if (cmd->scsi_status) {
501 pr_debug("compare_and_write_callback: non zero scsi_status:"
502 " 0x%02x\n", cmd->scsi_status);
503 *post_ret = 1;
504 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
505 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
506 goto out;
507 }
508
509 buf = kzalloc(cmd->data_length, GFP_KERNEL);
510 if (!buf) {
511 pr_err("Unable to allocate compare_and_write buf\n");
512 ret = TCM_OUT_OF_RESOURCES;
513 goto out;
514 }
515
516 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
517 GFP_KERNEL);
518 if (!write_sg) {
519 pr_err("Unable to allocate compare_and_write sg\n");
520 ret = TCM_OUT_OF_RESOURCES;
521 goto out;
522 }
523 sg_init_table(write_sg, cmd->t_data_nents);
524 /*
525 * Setup verify and write data payloads from total NumberLBAs.
526 */
527 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
528 cmd->data_length);
529 if (!rc) {
530 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
531 ret = TCM_OUT_OF_RESOURCES;
532 goto out;
533 }
534 /*
535 * Compare against SCSI READ payload against verify payload
536 */
537 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
538 addr = (unsigned char *)kmap_atomic(sg_page(sg));
539 if (!addr) {
540 ret = TCM_OUT_OF_RESOURCES;
541 goto out;
542 }
543
544 len = min(sg->length, compare_len);
545
546 if (memcmp(addr, buf + offset, len)) {
547 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
548 addr, buf + offset);
549 kunmap_atomic(addr);
550 goto miscompare;
551 }
552 kunmap_atomic(addr);
553
554 offset += len;
555 compare_len -= len;
556 if (!compare_len)
557 break;
558 }
559
560 i = 0;
561 len = cmd->t_task_nolb * block_size;
562 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
563 /*
564 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
565 */
566 while (len) {
567 sg_miter_next(&m);
568
569 if (block_size < PAGE_SIZE) {
570 sg_set_page(&write_sg[i], m.page, block_size,
571 m.piter.sg->offset + block_size);
572 } else {
573 sg_miter_next(&m);
574 sg_set_page(&write_sg[i], m.page, block_size,
575 m.piter.sg->offset);
576 }
577 len -= block_size;
578 i++;
579 }
580 sg_miter_stop(&m);
581 /*
582 * Save the original SGL + nents values before updating to new
583 * assignments, to be released in transport_free_pages() ->
584 * transport_reset_sgl_orig()
585 */
586 cmd->t_data_sg_orig = cmd->t_data_sg;
587 cmd->t_data_sg = write_sg;
588 cmd->t_data_nents_orig = cmd->t_data_nents;
589 cmd->t_data_nents = 1;
590
591 cmd->sam_task_attr = TCM_HEAD_TAG;
592 cmd->transport_complete_callback = compare_and_write_post;
593 /*
594 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
595 * for submitting the adjusted SGL to write instance user-data.
596 */
597 cmd->execute_cmd = sbc_execute_rw;
598
599 spin_lock_irq(&cmd->t_state_lock);
600 cmd->t_state = TRANSPORT_PROCESSING;
601 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
602 spin_unlock_irq(&cmd->t_state_lock);
603
604 __target_execute_cmd(cmd, false);
605
606 kfree(buf);
607 return ret;
608
609 miscompare:
610 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
611 dev->transport->name);
612 ret = TCM_MISCOMPARE_VERIFY;
613 out:
614 /*
615 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
616 * sbc_compare_and_write() before the original READ I/O submission.
617 */
618 up(&dev->caw_sem);
619 kfree(write_sg);
620 kfree(buf);
621 return ret;
622 }
623
624 static sense_reason_t
sbc_compare_and_write(struct se_cmd * cmd)625 sbc_compare_and_write(struct se_cmd *cmd)
626 {
627 struct sbc_ops *ops = cmd->protocol_data;
628 struct se_device *dev = cmd->se_dev;
629 sense_reason_t ret;
630 int rc;
631 /*
632 * Submit the READ first for COMPARE_AND_WRITE to perform the
633 * comparision using SGLs at cmd->t_bidi_data_sg..
634 */
635 rc = down_interruptible(&dev->caw_sem);
636 if (rc != 0) {
637 cmd->transport_complete_callback = NULL;
638 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
639 }
640 /*
641 * Reset cmd->data_length to individual block_size in order to not
642 * confuse backend drivers that depend on this value matching the
643 * size of the I/O being submitted.
644 */
645 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
646
647 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
648 DMA_FROM_DEVICE);
649 if (ret) {
650 cmd->transport_complete_callback = NULL;
651 up(&dev->caw_sem);
652 return ret;
653 }
654 /*
655 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
656 * upon MISCOMPARE, or in compare_and_write_done() upon completion
657 * of WRITE instance user-data.
658 */
659 return TCM_NO_SENSE;
660 }
661
662 static int
sbc_set_prot_op_checks(u8 protect,bool fabric_prot,enum target_prot_type prot_type,bool is_write,struct se_cmd * cmd)663 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
664 bool is_write, struct se_cmd *cmd)
665 {
666 if (is_write) {
667 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
668 protect ? TARGET_PROT_DOUT_PASS :
669 TARGET_PROT_DOUT_INSERT;
670 switch (protect) {
671 case 0x0:
672 case 0x3:
673 cmd->prot_checks = 0;
674 break;
675 case 0x1:
676 case 0x5:
677 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
678 if (prot_type == TARGET_DIF_TYPE1_PROT)
679 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
680 break;
681 case 0x2:
682 if (prot_type == TARGET_DIF_TYPE1_PROT)
683 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
684 break;
685 case 0x4:
686 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
687 break;
688 default:
689 pr_err("Unsupported protect field %d\n", protect);
690 return -EINVAL;
691 }
692 } else {
693 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
694 protect ? TARGET_PROT_DIN_PASS :
695 TARGET_PROT_DIN_STRIP;
696 switch (protect) {
697 case 0x0:
698 case 0x1:
699 case 0x5:
700 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
701 if (prot_type == TARGET_DIF_TYPE1_PROT)
702 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
703 break;
704 case 0x2:
705 if (prot_type == TARGET_DIF_TYPE1_PROT)
706 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
707 break;
708 case 0x3:
709 cmd->prot_checks = 0;
710 break;
711 case 0x4:
712 cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
713 break;
714 default:
715 pr_err("Unsupported protect field %d\n", protect);
716 return -EINVAL;
717 }
718 }
719
720 return 0;
721 }
722
723 static sense_reason_t
sbc_check_prot(struct se_device * dev,struct se_cmd * cmd,unsigned char protect,u32 sectors,bool is_write)724 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char protect,
725 u32 sectors, bool is_write)
726 {
727 int sp_ops = cmd->se_sess->sup_prot_ops;
728 int pi_prot_type = dev->dev_attrib.pi_prot_type;
729 bool fabric_prot = false;
730
731 if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
732 if (unlikely(protect &&
733 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
734 pr_err("CDB contains protect bit, but device + fabric does"
735 " not advertise PROTECT=1 feature bit\n");
736 return TCM_INVALID_CDB_FIELD;
737 }
738 if (cmd->prot_pto)
739 return TCM_NO_SENSE;
740 }
741
742 switch (dev->dev_attrib.pi_prot_type) {
743 case TARGET_DIF_TYPE3_PROT:
744 cmd->reftag_seed = 0xffffffff;
745 break;
746 case TARGET_DIF_TYPE2_PROT:
747 if (protect)
748 return TCM_INVALID_CDB_FIELD;
749
750 cmd->reftag_seed = cmd->t_task_lba;
751 break;
752 case TARGET_DIF_TYPE1_PROT:
753 cmd->reftag_seed = cmd->t_task_lba;
754 break;
755 case TARGET_DIF_TYPE0_PROT:
756 /*
757 * See if the fabric supports T10-PI, and the session has been
758 * configured to allow export PROTECT=1 feature bit with backend
759 * devices that don't support T10-PI.
760 */
761 fabric_prot = is_write ?
762 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
763 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
764
765 if (fabric_prot && cmd->se_sess->sess_prot_type) {
766 pi_prot_type = cmd->se_sess->sess_prot_type;
767 break;
768 }
769 if (!protect)
770 return TCM_NO_SENSE;
771 /* Fallthrough */
772 default:
773 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
774 "PROTECT: 0x%02x\n", cmd->t_task_cdb[0], protect);
775 return TCM_INVALID_CDB_FIELD;
776 }
777
778 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
779 return TCM_INVALID_CDB_FIELD;
780
781 cmd->prot_type = pi_prot_type;
782 cmd->prot_length = dev->prot_length * sectors;
783
784 /**
785 * In case protection information exists over the wire
786 * we modify command data length to describe pure data.
787 * The actual transfer length is data length + protection
788 * length
789 **/
790 if (protect)
791 cmd->data_length = sectors * dev->dev_attrib.block_size;
792
793 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
794 "prot_op=%d prot_checks=%d\n",
795 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
796 cmd->prot_op, cmd->prot_checks);
797
798 return TCM_NO_SENSE;
799 }
800
801 static int
sbc_check_dpofua(struct se_device * dev,struct se_cmd * cmd,unsigned char * cdb)802 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
803 {
804 if (cdb[1] & 0x10) {
805 /* see explanation in spc_emulate_modesense */
806 if (!target_check_fua(dev)) {
807 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
808 " does not advertise support for DPO\n", cdb[0]);
809 return -EINVAL;
810 }
811 }
812 if (cdb[1] & 0x8) {
813 if (!target_check_fua(dev)) {
814 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
815 " does not advertise support for FUA write\n",
816 cdb[0]);
817 return -EINVAL;
818 }
819 cmd->se_cmd_flags |= SCF_FUA;
820 }
821 return 0;
822 }
823
824 sense_reason_t
sbc_parse_cdb(struct se_cmd * cmd,struct sbc_ops * ops)825 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
826 {
827 struct se_device *dev = cmd->se_dev;
828 unsigned char *cdb = cmd->t_task_cdb;
829 unsigned int size;
830 u32 sectors = 0;
831 sense_reason_t ret;
832
833 cmd->protocol_data = ops;
834
835 switch (cdb[0]) {
836 case READ_6:
837 sectors = transport_get_sectors_6(cdb);
838 cmd->t_task_lba = transport_lba_21(cdb);
839 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
840 cmd->execute_cmd = sbc_execute_rw;
841 break;
842 case READ_10:
843 sectors = transport_get_sectors_10(cdb);
844 cmd->t_task_lba = transport_lba_32(cdb);
845
846 if (sbc_check_dpofua(dev, cmd, cdb))
847 return TCM_INVALID_CDB_FIELD;
848
849 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
850 if (ret)
851 return ret;
852
853 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
854 cmd->execute_cmd = sbc_execute_rw;
855 break;
856 case READ_12:
857 sectors = transport_get_sectors_12(cdb);
858 cmd->t_task_lba = transport_lba_32(cdb);
859
860 if (sbc_check_dpofua(dev, cmd, cdb))
861 return TCM_INVALID_CDB_FIELD;
862
863 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
864 if (ret)
865 return ret;
866
867 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
868 cmd->execute_cmd = sbc_execute_rw;
869 break;
870 case READ_16:
871 sectors = transport_get_sectors_16(cdb);
872 cmd->t_task_lba = transport_lba_64(cdb);
873
874 if (sbc_check_dpofua(dev, cmd, cdb))
875 return TCM_INVALID_CDB_FIELD;
876
877 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, false);
878 if (ret)
879 return ret;
880
881 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
882 cmd->execute_cmd = sbc_execute_rw;
883 break;
884 case WRITE_6:
885 sectors = transport_get_sectors_6(cdb);
886 cmd->t_task_lba = transport_lba_21(cdb);
887 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
888 cmd->execute_cmd = sbc_execute_rw;
889 break;
890 case WRITE_10:
891 case WRITE_VERIFY:
892 sectors = transport_get_sectors_10(cdb);
893 cmd->t_task_lba = transport_lba_32(cdb);
894
895 if (sbc_check_dpofua(dev, cmd, cdb))
896 return TCM_INVALID_CDB_FIELD;
897
898 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
899 if (ret)
900 return ret;
901
902 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
903 cmd->execute_cmd = sbc_execute_rw;
904 break;
905 case WRITE_12:
906 sectors = transport_get_sectors_12(cdb);
907 cmd->t_task_lba = transport_lba_32(cdb);
908
909 if (sbc_check_dpofua(dev, cmd, cdb))
910 return TCM_INVALID_CDB_FIELD;
911
912 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
913 if (ret)
914 return ret;
915
916 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
917 cmd->execute_cmd = sbc_execute_rw;
918 break;
919 case WRITE_16:
920 sectors = transport_get_sectors_16(cdb);
921 cmd->t_task_lba = transport_lba_64(cdb);
922
923 if (sbc_check_dpofua(dev, cmd, cdb))
924 return TCM_INVALID_CDB_FIELD;
925
926 ret = sbc_check_prot(dev, cmd, cdb[1] >> 5, sectors, true);
927 if (ret)
928 return ret;
929
930 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
931 cmd->execute_cmd = sbc_execute_rw;
932 break;
933 case XDWRITEREAD_10:
934 if (cmd->data_direction != DMA_TO_DEVICE ||
935 !(cmd->se_cmd_flags & SCF_BIDI))
936 return TCM_INVALID_CDB_FIELD;
937 sectors = transport_get_sectors_10(cdb);
938
939 if (sbc_check_dpofua(dev, cmd, cdb))
940 return TCM_INVALID_CDB_FIELD;
941
942 cmd->t_task_lba = transport_lba_32(cdb);
943 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
944
945 /*
946 * Setup BIDI XOR callback to be run after I/O completion.
947 */
948 cmd->execute_cmd = sbc_execute_rw;
949 cmd->transport_complete_callback = &xdreadwrite_callback;
950 break;
951 case VARIABLE_LENGTH_CMD:
952 {
953 u16 service_action = get_unaligned_be16(&cdb[8]);
954 switch (service_action) {
955 case XDWRITEREAD_32:
956 sectors = transport_get_sectors_32(cdb);
957
958 if (sbc_check_dpofua(dev, cmd, cdb))
959 return TCM_INVALID_CDB_FIELD;
960 /*
961 * Use WRITE_32 and READ_32 opcodes for the emulated
962 * XDWRITE_READ_32 logic.
963 */
964 cmd->t_task_lba = transport_lba_64_ext(cdb);
965 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
966
967 /*
968 * Setup BIDI XOR callback to be run during after I/O
969 * completion.
970 */
971 cmd->execute_cmd = sbc_execute_rw;
972 cmd->transport_complete_callback = &xdreadwrite_callback;
973 break;
974 case WRITE_SAME_32:
975 sectors = transport_get_sectors_32(cdb);
976 if (!sectors) {
977 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
978 " supported\n");
979 return TCM_INVALID_CDB_FIELD;
980 }
981
982 size = sbc_get_size(cmd, 1);
983 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
984
985 ret = sbc_setup_write_same(cmd, cdb[10], ops);
986 if (ret)
987 return ret;
988 break;
989 default:
990 pr_err("VARIABLE_LENGTH_CMD service action"
991 " 0x%04x not supported\n", service_action);
992 return TCM_UNSUPPORTED_SCSI_OPCODE;
993 }
994 break;
995 }
996 case COMPARE_AND_WRITE:
997 sectors = cdb[13];
998 /*
999 * Currently enforce COMPARE_AND_WRITE for a single sector
1000 */
1001 if (sectors > 1) {
1002 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
1003 " than 1\n", sectors);
1004 return TCM_INVALID_CDB_FIELD;
1005 }
1006 if (sbc_check_dpofua(dev, cmd, cdb))
1007 return TCM_INVALID_CDB_FIELD;
1008
1009 /*
1010 * Double size because we have two buffers, note that
1011 * zero is not an error..
1012 */
1013 size = 2 * sbc_get_size(cmd, sectors);
1014 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1015 cmd->t_task_nolb = sectors;
1016 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
1017 cmd->execute_cmd = sbc_compare_and_write;
1018 cmd->transport_complete_callback = compare_and_write_callback;
1019 break;
1020 case READ_CAPACITY:
1021 size = READ_CAP_LEN;
1022 cmd->execute_cmd = sbc_emulate_readcapacity;
1023 break;
1024 case SERVICE_ACTION_IN_16:
1025 switch (cmd->t_task_cdb[1] & 0x1f) {
1026 case SAI_READ_CAPACITY_16:
1027 cmd->execute_cmd = sbc_emulate_readcapacity_16;
1028 break;
1029 case SAI_REPORT_REFERRALS:
1030 cmd->execute_cmd = target_emulate_report_referrals;
1031 break;
1032 default:
1033 pr_err("Unsupported SA: 0x%02x\n",
1034 cmd->t_task_cdb[1] & 0x1f);
1035 return TCM_INVALID_CDB_FIELD;
1036 }
1037 size = (cdb[10] << 24) | (cdb[11] << 16) |
1038 (cdb[12] << 8) | cdb[13];
1039 break;
1040 case SYNCHRONIZE_CACHE:
1041 case SYNCHRONIZE_CACHE_16:
1042 if (cdb[0] == SYNCHRONIZE_CACHE) {
1043 sectors = transport_get_sectors_10(cdb);
1044 cmd->t_task_lba = transport_lba_32(cdb);
1045 } else {
1046 sectors = transport_get_sectors_16(cdb);
1047 cmd->t_task_lba = transport_lba_64(cdb);
1048 }
1049 if (ops->execute_sync_cache) {
1050 cmd->execute_cmd = ops->execute_sync_cache;
1051 goto check_lba;
1052 }
1053 size = 0;
1054 cmd->execute_cmd = sbc_emulate_noop;
1055 break;
1056 case UNMAP:
1057 if (!ops->execute_unmap)
1058 return TCM_UNSUPPORTED_SCSI_OPCODE;
1059
1060 if (!dev->dev_attrib.emulate_tpu) {
1061 pr_err("Got UNMAP, but backend device has"
1062 " emulate_tpu disabled\n");
1063 return TCM_UNSUPPORTED_SCSI_OPCODE;
1064 }
1065 size = get_unaligned_be16(&cdb[7]);
1066 cmd->execute_cmd = sbc_execute_unmap;
1067 break;
1068 case WRITE_SAME_16:
1069 sectors = transport_get_sectors_16(cdb);
1070 if (!sectors) {
1071 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1072 return TCM_INVALID_CDB_FIELD;
1073 }
1074
1075 size = sbc_get_size(cmd, 1);
1076 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1077
1078 ret = sbc_setup_write_same(cmd, cdb[1], ops);
1079 if (ret)
1080 return ret;
1081 break;
1082 case WRITE_SAME:
1083 sectors = transport_get_sectors_10(cdb);
1084 if (!sectors) {
1085 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1086 return TCM_INVALID_CDB_FIELD;
1087 }
1088
1089 size = sbc_get_size(cmd, 1);
1090 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1091
1092 /*
1093 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1094 * of byte 1 bit 3 UNMAP instead of original reserved field
1095 */
1096 ret = sbc_setup_write_same(cmd, cdb[1], ops);
1097 if (ret)
1098 return ret;
1099 break;
1100 case VERIFY:
1101 case VERIFY_16:
1102 size = 0;
1103 if (cdb[0] == VERIFY) {
1104 sectors = transport_get_sectors_10(cdb);
1105 cmd->t_task_lba = transport_lba_32(cdb);
1106 } else {
1107 sectors = transport_get_sectors_16(cdb);
1108 cmd->t_task_lba = transport_lba_64(cdb);
1109 }
1110 cmd->execute_cmd = sbc_emulate_noop;
1111 goto check_lba;
1112 case REZERO_UNIT:
1113 case SEEK_6:
1114 case SEEK_10:
1115 /*
1116 * There are still clients out there which use these old SCSI-2
1117 * commands. This mainly happens when running VMs with legacy
1118 * guest systems, connected via SCSI command pass-through to
1119 * iSCSI targets. Make them happy and return status GOOD.
1120 */
1121 size = 0;
1122 cmd->execute_cmd = sbc_emulate_noop;
1123 break;
1124 case START_STOP:
1125 size = 0;
1126 cmd->execute_cmd = sbc_emulate_startstop;
1127 break;
1128 default:
1129 ret = spc_parse_cdb(cmd, &size);
1130 if (ret)
1131 return ret;
1132 }
1133
1134 /* reject any command that we don't have a handler for */
1135 if (!cmd->execute_cmd)
1136 return TCM_UNSUPPORTED_SCSI_OPCODE;
1137
1138 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1139 unsigned long long end_lba;
1140 check_lba:
1141 end_lba = dev->transport->get_blocks(dev) + 1;
1142 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1143 ((cmd->t_task_lba + sectors) > end_lba)) {
1144 pr_err("cmd exceeds last lba %llu "
1145 "(lba %llu, sectors %u)\n",
1146 end_lba, cmd->t_task_lba, sectors);
1147 return TCM_ADDRESS_OUT_OF_RANGE;
1148 }
1149
1150 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1151 size = sbc_get_size(cmd, sectors);
1152 }
1153
1154 return target_cmd_size_check(cmd, size);
1155 }
1156 EXPORT_SYMBOL(sbc_parse_cdb);
1157
sbc_get_device_type(struct se_device * dev)1158 u32 sbc_get_device_type(struct se_device *dev)
1159 {
1160 return TYPE_DISK;
1161 }
1162 EXPORT_SYMBOL(sbc_get_device_type);
1163
1164 static sense_reason_t
sbc_execute_unmap(struct se_cmd * cmd)1165 sbc_execute_unmap(struct se_cmd *cmd)
1166 {
1167 struct sbc_ops *ops = cmd->protocol_data;
1168 struct se_device *dev = cmd->se_dev;
1169 unsigned char *buf, *ptr = NULL;
1170 sector_t lba;
1171 int size;
1172 u32 range;
1173 sense_reason_t ret = 0;
1174 int dl, bd_dl;
1175
1176 /* We never set ANC_SUP */
1177 if (cmd->t_task_cdb[1])
1178 return TCM_INVALID_CDB_FIELD;
1179
1180 if (cmd->data_length == 0) {
1181 target_complete_cmd(cmd, SAM_STAT_GOOD);
1182 return 0;
1183 }
1184
1185 if (cmd->data_length < 8) {
1186 pr_warn("UNMAP parameter list length %u too small\n",
1187 cmd->data_length);
1188 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1189 }
1190
1191 buf = transport_kmap_data_sg(cmd);
1192 if (!buf)
1193 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1194
1195 dl = get_unaligned_be16(&buf[0]);
1196 bd_dl = get_unaligned_be16(&buf[2]);
1197
1198 size = cmd->data_length - 8;
1199 if (bd_dl > size)
1200 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1201 cmd->data_length, bd_dl);
1202 else
1203 size = bd_dl;
1204
1205 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1206 ret = TCM_INVALID_PARAMETER_LIST;
1207 goto err;
1208 }
1209
1210 /* First UNMAP block descriptor starts at 8 byte offset */
1211 ptr = &buf[8];
1212 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1213 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1214
1215 while (size >= 16) {
1216 lba = get_unaligned_be64(&ptr[0]);
1217 range = get_unaligned_be32(&ptr[8]);
1218 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1219 (unsigned long long)lba, range);
1220
1221 if (range > dev->dev_attrib.max_unmap_lba_count) {
1222 ret = TCM_INVALID_PARAMETER_LIST;
1223 goto err;
1224 }
1225
1226 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1227 ret = TCM_ADDRESS_OUT_OF_RANGE;
1228 goto err;
1229 }
1230
1231 ret = ops->execute_unmap(cmd, lba, range);
1232 if (ret)
1233 goto err;
1234
1235 ptr += 16;
1236 size -= 16;
1237 }
1238
1239 err:
1240 transport_kunmap_data_sg(cmd);
1241 if (!ret)
1242 target_complete_cmd(cmd, GOOD);
1243 return ret;
1244 }
1245
1246 void
sbc_dif_generate(struct se_cmd * cmd)1247 sbc_dif_generate(struct se_cmd *cmd)
1248 {
1249 struct se_device *dev = cmd->se_dev;
1250 struct t10_pi_tuple *sdt;
1251 struct scatterlist *dsg = cmd->t_data_sg, *psg;
1252 sector_t sector = cmd->t_task_lba;
1253 void *daddr, *paddr;
1254 int i, j, offset = 0;
1255 unsigned int block_size = dev->dev_attrib.block_size;
1256
1257 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1258 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1259 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1260
1261 for (j = 0; j < psg->length;
1262 j += sizeof(*sdt)) {
1263 __u16 crc;
1264 unsigned int avail;
1265
1266 if (offset >= dsg->length) {
1267 offset -= dsg->length;
1268 kunmap_atomic(daddr - dsg->offset);
1269 dsg = sg_next(dsg);
1270 if (!dsg) {
1271 kunmap_atomic(paddr - psg->offset);
1272 return;
1273 }
1274 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1275 }
1276
1277 sdt = paddr + j;
1278 avail = min(block_size, dsg->length - offset);
1279 crc = crc_t10dif(daddr + offset, avail);
1280 if (avail < block_size) {
1281 kunmap_atomic(daddr - dsg->offset);
1282 dsg = sg_next(dsg);
1283 if (!dsg) {
1284 kunmap_atomic(paddr - psg->offset);
1285 return;
1286 }
1287 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1288 offset = block_size - avail;
1289 crc = crc_t10dif_update(crc, daddr, offset);
1290 } else {
1291 offset += block_size;
1292 }
1293
1294 sdt->guard_tag = cpu_to_be16(crc);
1295 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1296 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1297 sdt->app_tag = 0;
1298
1299 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1300 " app_tag: 0x%04x ref_tag: %u\n",
1301 (cmd->data_direction == DMA_TO_DEVICE) ?
1302 "WRITE" : "READ", (unsigned long long)sector,
1303 sdt->guard_tag, sdt->app_tag,
1304 be32_to_cpu(sdt->ref_tag));
1305
1306 sector++;
1307 }
1308
1309 kunmap_atomic(daddr - dsg->offset);
1310 kunmap_atomic(paddr - psg->offset);
1311 }
1312 }
1313
1314 static sense_reason_t
sbc_dif_v1_verify(struct se_cmd * cmd,struct t10_pi_tuple * sdt,__u16 crc,sector_t sector,unsigned int ei_lba)1315 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt,
1316 __u16 crc, sector_t sector, unsigned int ei_lba)
1317 {
1318 __be16 csum;
1319
1320 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1321 goto check_ref;
1322
1323 csum = cpu_to_be16(crc);
1324
1325 if (sdt->guard_tag != csum) {
1326 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1327 " csum 0x%04x\n", (unsigned long long)sector,
1328 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1329 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1330 }
1331
1332 check_ref:
1333 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1334 return 0;
1335
1336 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1337 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1338 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1339 " sector MSB: 0x%08x\n", (unsigned long long)sector,
1340 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1341 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1342 }
1343
1344 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1345 be32_to_cpu(sdt->ref_tag) != ei_lba) {
1346 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1347 " ei_lba: 0x%08x\n", (unsigned long long)sector,
1348 be32_to_cpu(sdt->ref_tag), ei_lba);
1349 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1350 }
1351
1352 return 0;
1353 }
1354
sbc_dif_copy_prot(struct se_cmd * cmd,unsigned int sectors,bool read,struct scatterlist * sg,int sg_off)1355 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1356 struct scatterlist *sg, int sg_off)
1357 {
1358 struct se_device *dev = cmd->se_dev;
1359 struct scatterlist *psg;
1360 void *paddr, *addr;
1361 unsigned int i, len, left;
1362 unsigned int offset = sg_off;
1363
1364 if (!sg)
1365 return;
1366
1367 left = sectors * dev->prot_length;
1368
1369 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1370 unsigned int psg_len, copied = 0;
1371
1372 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1373 psg_len = min(left, psg->length);
1374 while (psg_len) {
1375 len = min(psg_len, sg->length - offset);
1376 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1377
1378 if (read)
1379 memcpy(paddr + copied, addr, len);
1380 else
1381 memcpy(addr, paddr + copied, len);
1382
1383 left -= len;
1384 offset += len;
1385 copied += len;
1386 psg_len -= len;
1387
1388 kunmap_atomic(addr - sg->offset - offset);
1389
1390 if (offset >= sg->length) {
1391 sg = sg_next(sg);
1392 offset = 0;
1393 }
1394 }
1395 kunmap_atomic(paddr - psg->offset);
1396 }
1397 }
1398 EXPORT_SYMBOL(sbc_dif_copy_prot);
1399
1400 sense_reason_t
sbc_dif_verify(struct se_cmd * cmd,sector_t start,unsigned int sectors,unsigned int ei_lba,struct scatterlist * psg,int psg_off)1401 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1402 unsigned int ei_lba, struct scatterlist *psg, int psg_off)
1403 {
1404 struct se_device *dev = cmd->se_dev;
1405 struct t10_pi_tuple *sdt;
1406 struct scatterlist *dsg = cmd->t_data_sg;
1407 sector_t sector = start;
1408 void *daddr, *paddr;
1409 int i;
1410 sense_reason_t rc;
1411 int dsg_off = 0;
1412 unsigned int block_size = dev->dev_attrib.block_size;
1413
1414 for (; psg && sector < start + sectors; psg = sg_next(psg)) {
1415 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1416 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1417
1418 for (i = psg_off; i < psg->length &&
1419 sector < start + sectors;
1420 i += sizeof(*sdt)) {
1421 __u16 crc;
1422 unsigned int avail;
1423
1424 if (dsg_off >= dsg->length) {
1425 dsg_off -= dsg->length;
1426 kunmap_atomic(daddr - dsg->offset);
1427 dsg = sg_next(dsg);
1428 if (!dsg) {
1429 kunmap_atomic(paddr - psg->offset);
1430 return 0;
1431 }
1432 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1433 }
1434
1435 sdt = paddr + i;
1436
1437 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1438 " app_tag: 0x%04x ref_tag: %u\n",
1439 (unsigned long long)sector, sdt->guard_tag,
1440 sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1441
1442 if (sdt->app_tag == cpu_to_be16(0xffff)) {
1443 dsg_off += block_size;
1444 goto next;
1445 }
1446
1447 avail = min(block_size, dsg->length - dsg_off);
1448 crc = crc_t10dif(daddr + dsg_off, avail);
1449 if (avail < block_size) {
1450 kunmap_atomic(daddr - dsg->offset);
1451 dsg = sg_next(dsg);
1452 if (!dsg) {
1453 kunmap_atomic(paddr - psg->offset);
1454 return 0;
1455 }
1456 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1457 dsg_off = block_size - avail;
1458 crc = crc_t10dif_update(crc, daddr, dsg_off);
1459 } else {
1460 dsg_off += block_size;
1461 }
1462
1463 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
1464 if (rc) {
1465 kunmap_atomic(daddr - dsg->offset);
1466 kunmap_atomic(paddr - psg->offset);
1467 cmd->bad_sector = sector;
1468 return rc;
1469 }
1470 next:
1471 sector++;
1472 ei_lba++;
1473 }
1474
1475 psg_off = 0;
1476 kunmap_atomic(daddr - dsg->offset);
1477 kunmap_atomic(paddr - psg->offset);
1478 }
1479
1480 return 0;
1481 }
1482 EXPORT_SYMBOL(sbc_dif_verify);
1483