1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SCSI Block Commands (SBC) parsing and emulation. 4 * 5 * (c) Copyright 2002-2013 Datera, Inc. 6 * 7 * Nicholas A. Bellinger <nab@kernel.org> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/ratelimit.h> 13 #include <linux/crc-t10dif.h> 14 #include <linux/t10-pi.h> 15 #include <asm/unaligned.h> 16 #include <scsi/scsi_proto.h> 17 #include <scsi/scsi_tcq.h> 18 19 #include <target/target_core_base.h> 20 #include <target/target_core_backend.h> 21 #include <target/target_core_fabric.h> 22 23 #include "target_core_internal.h" 24 #include "target_core_ua.h" 25 #include "target_core_alua.h" 26 27 static sense_reason_t 28 sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); 29 static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); 30 31 static sense_reason_t 32 sbc_emulate_readcapacity(struct se_cmd *cmd) 33 { 34 struct se_device *dev = cmd->se_dev; 35 unsigned char *cdb = cmd->t_task_cdb; 36 unsigned long long blocks_long = dev->transport->get_blocks(dev); 37 unsigned char *rbuf; 38 unsigned char buf[8]; 39 u32 blocks; 40 41 /* 42 * SBC-2 says: 43 * If the PMI bit is set to zero and the LOGICAL BLOCK 44 * ADDRESS field is not set to zero, the device server shall 45 * terminate the command with CHECK CONDITION status with 46 * the sense key set to ILLEGAL REQUEST and the additional 47 * sense code set to INVALID FIELD IN CDB. 48 * 49 * In SBC-3, these fields are obsolete, but some SCSI 50 * compliance tests actually check this, so we might as well 51 * follow SBC-2. 52 */ 53 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 54 return TCM_INVALID_CDB_FIELD; 55 56 if (blocks_long >= 0x00000000ffffffff) 57 blocks = 0xffffffff; 58 else 59 blocks = (u32)blocks_long; 60 61 put_unaligned_be32(blocks, &buf[0]); 62 put_unaligned_be32(dev->dev_attrib.block_size, &buf[4]); 63 64 rbuf = transport_kmap_data_sg(cmd); 65 if (rbuf) { 66 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 67 transport_kunmap_data_sg(cmd); 68 } 69 70 target_complete_cmd_with_length(cmd, GOOD, 8); 71 return 0; 72 } 73 74 static sense_reason_t 75 sbc_emulate_readcapacity_16(struct se_cmd *cmd) 76 { 77 struct se_device *dev = cmd->se_dev; 78 struct se_session *sess = cmd->se_sess; 79 int pi_prot_type = dev->dev_attrib.pi_prot_type; 80 81 unsigned char *rbuf; 82 unsigned char buf[32]; 83 unsigned long long blocks = dev->transport->get_blocks(dev); 84 85 memset(buf, 0, sizeof(buf)); 86 put_unaligned_be64(blocks, &buf[0]); 87 put_unaligned_be32(dev->dev_attrib.block_size, &buf[8]); 88 /* 89 * Set P_TYPE and PROT_EN bits for DIF support 90 */ 91 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 92 /* 93 * Only override a device's pi_prot_type if no T10-PI is 94 * available, and sess_prot_type has been explicitly enabled. 95 */ 96 if (!pi_prot_type) 97 pi_prot_type = sess->sess_prot_type; 98 99 if (pi_prot_type) 100 buf[12] = (pi_prot_type - 1) << 1 | 0x1; 101 } 102 103 if (dev->transport->get_lbppbe) 104 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 105 106 if (dev->transport->get_alignment_offset_lbas) { 107 u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 108 109 put_unaligned_be16(lalba, &buf[14]); 110 } 111 112 /* 113 * Set Thin Provisioning Enable bit following sbc3r22 in section 114 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 115 */ 116 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { 117 buf[14] |= 0x80; 118 119 /* 120 * LBPRZ signifies that zeroes will be read back from an LBA after 121 * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) 122 */ 123 if (dev->dev_attrib.unmap_zeroes_data) 124 buf[14] |= 0x40; 125 } 126 127 rbuf = transport_kmap_data_sg(cmd); 128 if (rbuf) { 129 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 130 transport_kunmap_data_sg(cmd); 131 } 132 133 target_complete_cmd_with_length(cmd, GOOD, 32); 134 return 0; 135 } 136 137 static sense_reason_t 138 sbc_emulate_startstop(struct se_cmd *cmd) 139 { 140 unsigned char *cdb = cmd->t_task_cdb; 141 142 /* 143 * See sbc3r36 section 5.25 144 * Immediate bit should be set since there is nothing to complete 145 * POWER CONDITION MODIFIER 0h 146 */ 147 if (!(cdb[1] & 1) || cdb[2] || cdb[3]) 148 return TCM_INVALID_CDB_FIELD; 149 150 /* 151 * See sbc3r36 section 5.25 152 * POWER CONDITION 0h START_VALID - process START and LOEJ 153 */ 154 if (cdb[4] >> 4 & 0xf) 155 return TCM_INVALID_CDB_FIELD; 156 157 /* 158 * See sbc3r36 section 5.25 159 * LOEJ 0h - nothing to load or unload 160 * START 1h - we are ready 161 */ 162 if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) 163 return TCM_INVALID_CDB_FIELD; 164 165 target_complete_cmd(cmd, SAM_STAT_GOOD); 166 return 0; 167 } 168 169 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 170 { 171 u32 num_blocks; 172 173 if (cmd->t_task_cdb[0] == WRITE_SAME) 174 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 175 else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 176 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 177 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 178 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 179 180 /* 181 * Use the explicit range when non zero is supplied, otherwise calculate 182 * the remaining range based on ->get_blocks() - starting LBA. 183 */ 184 if (num_blocks) 185 return num_blocks; 186 187 return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 188 cmd->t_task_lba + 1; 189 } 190 EXPORT_SYMBOL(sbc_get_write_same_sectors); 191 192 static sense_reason_t 193 sbc_execute_write_same_unmap(struct se_cmd *cmd) 194 { 195 struct sbc_ops *ops = cmd->protocol_data; 196 sector_t nolb = sbc_get_write_same_sectors(cmd); 197 sense_reason_t ret; 198 199 if (nolb) { 200 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); 201 if (ret) 202 return ret; 203 } 204 205 target_complete_cmd(cmd, GOOD); 206 return 0; 207 } 208 209 static sense_reason_t 210 sbc_emulate_noop(struct se_cmd *cmd) 211 { 212 target_complete_cmd(cmd, GOOD); 213 return 0; 214 } 215 216 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 217 { 218 return cmd->se_dev->dev_attrib.block_size * sectors; 219 } 220 221 static inline u32 transport_get_sectors_6(unsigned char *cdb) 222 { 223 /* 224 * Use 8-bit sector value. SBC-3 says: 225 * 226 * A TRANSFER LENGTH field set to zero specifies that 256 227 * logical blocks shall be written. Any other value 228 * specifies the number of logical blocks that shall be 229 * written. 230 */ 231 return cdb[4] ? : 256; 232 } 233 234 static inline u32 transport_get_sectors_10(unsigned char *cdb) 235 { 236 return get_unaligned_be16(&cdb[7]); 237 } 238 239 static inline u32 transport_get_sectors_12(unsigned char *cdb) 240 { 241 return get_unaligned_be32(&cdb[6]); 242 } 243 244 static inline u32 transport_get_sectors_16(unsigned char *cdb) 245 { 246 return get_unaligned_be32(&cdb[10]); 247 } 248 249 /* 250 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 251 */ 252 static inline u32 transport_get_sectors_32(unsigned char *cdb) 253 { 254 return get_unaligned_be32(&cdb[28]); 255 256 } 257 258 static inline u32 transport_lba_21(unsigned char *cdb) 259 { 260 return get_unaligned_be24(&cdb[1]) & 0x1fffff; 261 } 262 263 static inline u32 transport_lba_32(unsigned char *cdb) 264 { 265 return get_unaligned_be32(&cdb[2]); 266 } 267 268 static inline unsigned long long transport_lba_64(unsigned char *cdb) 269 { 270 return get_unaligned_be64(&cdb[2]); 271 } 272 273 /* 274 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 275 */ 276 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 277 { 278 return get_unaligned_be64(&cdb[12]); 279 } 280 281 static sense_reason_t 282 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 283 { 284 struct se_device *dev = cmd->se_dev; 285 sector_t end_lba = dev->transport->get_blocks(dev) + 1; 286 unsigned int sectors = sbc_get_write_same_sectors(cmd); 287 sense_reason_t ret; 288 289 if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 290 pr_err("WRITE_SAME PBDATA and LBDATA" 291 " bits not supported for Block Discard" 292 " Emulation\n"); 293 return TCM_UNSUPPORTED_SCSI_OPCODE; 294 } 295 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 296 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 297 sectors, cmd->se_dev->dev_attrib.max_write_same_len); 298 return TCM_INVALID_CDB_FIELD; 299 } 300 /* 301 * Sanity check for LBA wrap and request past end of device. 302 */ 303 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 304 ((cmd->t_task_lba + sectors) > end_lba)) { 305 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 306 (unsigned long long)end_lba, cmd->t_task_lba, sectors); 307 return TCM_ADDRESS_OUT_OF_RANGE; 308 } 309 310 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 311 if (flags[0] & 0x10) { 312 pr_warn("WRITE SAME with ANCHOR not supported\n"); 313 return TCM_INVALID_CDB_FIELD; 314 } 315 /* 316 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 317 * translated into block discard requests within backend code. 318 */ 319 if (flags[0] & 0x08) { 320 if (!ops->execute_unmap) 321 return TCM_UNSUPPORTED_SCSI_OPCODE; 322 323 if (!dev->dev_attrib.emulate_tpws) { 324 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" 325 " has emulate_tpws disabled\n"); 326 return TCM_UNSUPPORTED_SCSI_OPCODE; 327 } 328 cmd->execute_cmd = sbc_execute_write_same_unmap; 329 return 0; 330 } 331 if (!ops->execute_write_same) 332 return TCM_UNSUPPORTED_SCSI_OPCODE; 333 334 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); 335 if (ret) 336 return ret; 337 338 cmd->execute_cmd = ops->execute_write_same; 339 return 0; 340 } 341 342 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, 343 int *post_ret) 344 { 345 unsigned char *buf, *addr; 346 struct scatterlist *sg; 347 unsigned int offset; 348 sense_reason_t ret = TCM_NO_SENSE; 349 int i, count; 350 351 if (!success) 352 return 0; 353 354 /* 355 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 356 * 357 * 1) read the specified logical block(s); 358 * 2) transfer logical blocks from the data-out buffer; 359 * 3) XOR the logical blocks transferred from the data-out buffer with 360 * the logical blocks read, storing the resulting XOR data in a buffer; 361 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 362 * blocks transferred from the data-out buffer; and 363 * 5) transfer the resulting XOR data to the data-in buffer. 364 */ 365 buf = kmalloc(cmd->data_length, GFP_KERNEL); 366 if (!buf) { 367 pr_err("Unable to allocate xor_callback buf\n"); 368 return TCM_OUT_OF_RESOURCES; 369 } 370 /* 371 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 372 * into the locally allocated *buf 373 */ 374 sg_copy_to_buffer(cmd->t_data_sg, 375 cmd->t_data_nents, 376 buf, 377 cmd->data_length); 378 379 /* 380 * Now perform the XOR against the BIDI read memory located at 381 * cmd->t_mem_bidi_list 382 */ 383 384 offset = 0; 385 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 386 addr = kmap_atomic(sg_page(sg)); 387 if (!addr) { 388 ret = TCM_OUT_OF_RESOURCES; 389 goto out; 390 } 391 392 for (i = 0; i < sg->length; i++) 393 *(addr + sg->offset + i) ^= *(buf + offset + i); 394 395 offset += sg->length; 396 kunmap_atomic(addr); 397 } 398 399 out: 400 kfree(buf); 401 return ret; 402 } 403 404 static sense_reason_t 405 sbc_execute_rw(struct se_cmd *cmd) 406 { 407 struct sbc_ops *ops = cmd->protocol_data; 408 409 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 410 cmd->data_direction); 411 } 412 413 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, 414 int *post_ret) 415 { 416 struct se_device *dev = cmd->se_dev; 417 sense_reason_t ret = TCM_NO_SENSE; 418 419 spin_lock_irq(&cmd->t_state_lock); 420 if (success) { 421 *post_ret = 1; 422 423 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 424 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 425 } 426 spin_unlock_irq(&cmd->t_state_lock); 427 428 /* 429 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 430 * before the original READ I/O submission. 431 */ 432 up(&dev->caw_sem); 433 434 return ret; 435 } 436 437 /* 438 * compare @cmp_len bytes of @read_sgl with @cmp_sgl. On miscompare, fill 439 * @miscmp_off and return TCM_MISCOMPARE_VERIFY. 440 */ 441 static sense_reason_t 442 compare_and_write_do_cmp(struct scatterlist *read_sgl, unsigned int read_nents, 443 struct scatterlist *cmp_sgl, unsigned int cmp_nents, 444 unsigned int cmp_len, unsigned int *miscmp_off) 445 { 446 unsigned char *buf = NULL; 447 struct scatterlist *sg; 448 sense_reason_t ret; 449 unsigned int offset; 450 size_t rc; 451 int sg_cnt; 452 453 buf = kzalloc(cmp_len, GFP_KERNEL); 454 if (!buf) { 455 ret = TCM_OUT_OF_RESOURCES; 456 goto out; 457 } 458 459 rc = sg_copy_to_buffer(cmp_sgl, cmp_nents, buf, cmp_len); 460 if (!rc) { 461 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 462 ret = TCM_OUT_OF_RESOURCES; 463 goto out; 464 } 465 /* 466 * Compare SCSI READ payload against verify payload 467 */ 468 offset = 0; 469 ret = TCM_NO_SENSE; 470 for_each_sg(read_sgl, sg, read_nents, sg_cnt) { 471 unsigned int len = min(sg->length, cmp_len); 472 unsigned char *addr = kmap_atomic(sg_page(sg)); 473 474 if (memcmp(addr, buf + offset, len)) { 475 unsigned int i; 476 477 for (i = 0; i < len && addr[i] == buf[offset + i]; i++) 478 ; 479 *miscmp_off = offset + i; 480 pr_warn("Detected MISCOMPARE at offset %u\n", 481 *miscmp_off); 482 ret = TCM_MISCOMPARE_VERIFY; 483 } 484 kunmap_atomic(addr); 485 if (ret != TCM_NO_SENSE) 486 goto out; 487 488 offset += len; 489 cmp_len -= len; 490 if (!cmp_len) 491 break; 492 } 493 pr_debug("COMPARE AND WRITE read data matches compare data\n"); 494 out: 495 kfree(buf); 496 return ret; 497 } 498 499 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, 500 int *post_ret) 501 { 502 struct se_device *dev = cmd->se_dev; 503 struct sg_table write_tbl = { }; 504 struct scatterlist *write_sg; 505 struct sg_mapping_iter m; 506 unsigned int len; 507 unsigned int block_size = dev->dev_attrib.block_size; 508 unsigned int compare_len = (cmd->t_task_nolb * block_size); 509 unsigned int miscmp_off = 0; 510 sense_reason_t ret = TCM_NO_SENSE; 511 int i; 512 513 /* 514 * Handle early failure in transport_generic_request_failure(), 515 * which will not have taken ->caw_sem yet.. 516 */ 517 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 518 return TCM_NO_SENSE; 519 /* 520 * Handle special case for zero-length COMPARE_AND_WRITE 521 */ 522 if (!cmd->data_length) 523 goto out; 524 /* 525 * Immediately exit + release dev->caw_sem if command has already 526 * been failed with a non-zero SCSI status. 527 */ 528 if (cmd->scsi_status) { 529 pr_debug("compare_and_write_callback: non zero scsi_status:" 530 " 0x%02x\n", cmd->scsi_status); 531 *post_ret = 1; 532 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 533 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 534 goto out; 535 } 536 537 ret = compare_and_write_do_cmp(cmd->t_bidi_data_sg, 538 cmd->t_bidi_data_nents, 539 cmd->t_data_sg, 540 cmd->t_data_nents, 541 compare_len, 542 &miscmp_off); 543 if (ret == TCM_MISCOMPARE_VERIFY) { 544 /* 545 * SBC-4 r15: 5.3 COMPARE AND WRITE command 546 * In the sense data (see 4.18 and SPC-5) the offset from the 547 * start of the Data-Out Buffer to the first byte of data that 548 * was not equal shall be reported in the INFORMATION field. 549 */ 550 cmd->sense_info = miscmp_off; 551 goto out; 552 } else if (ret) 553 goto out; 554 555 if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) { 556 pr_err("Unable to allocate compare_and_write sg\n"); 557 ret = TCM_OUT_OF_RESOURCES; 558 goto out; 559 } 560 write_sg = write_tbl.sgl; 561 562 i = 0; 563 len = compare_len; 564 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 565 /* 566 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 567 */ 568 while (len) { 569 sg_miter_next(&m); 570 571 if (block_size < PAGE_SIZE) { 572 sg_set_page(&write_sg[i], m.page, block_size, 573 m.piter.sg->offset + block_size); 574 } else { 575 sg_miter_next(&m); 576 sg_set_page(&write_sg[i], m.page, block_size, 577 m.piter.sg->offset); 578 } 579 len -= block_size; 580 i++; 581 } 582 sg_miter_stop(&m); 583 /* 584 * Save the original SGL + nents values before updating to new 585 * assignments, to be released in transport_free_pages() -> 586 * transport_reset_sgl_orig() 587 */ 588 cmd->t_data_sg_orig = cmd->t_data_sg; 589 cmd->t_data_sg = write_sg; 590 cmd->t_data_nents_orig = cmd->t_data_nents; 591 cmd->t_data_nents = 1; 592 593 cmd->sam_task_attr = TCM_HEAD_TAG; 594 cmd->transport_complete_callback = compare_and_write_post; 595 /* 596 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 597 * for submitting the adjusted SGL to write instance user-data. 598 */ 599 cmd->execute_cmd = sbc_execute_rw; 600 601 spin_lock_irq(&cmd->t_state_lock); 602 cmd->t_state = TRANSPORT_PROCESSING; 603 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; 604 spin_unlock_irq(&cmd->t_state_lock); 605 606 __target_execute_cmd(cmd, false); 607 608 return ret; 609 610 out: 611 /* 612 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 613 * sbc_compare_and_write() before the original READ I/O submission. 614 */ 615 up(&dev->caw_sem); 616 sg_free_table(&write_tbl); 617 return ret; 618 } 619 620 static sense_reason_t 621 sbc_compare_and_write(struct se_cmd *cmd) 622 { 623 struct sbc_ops *ops = cmd->protocol_data; 624 struct se_device *dev = cmd->se_dev; 625 sense_reason_t ret; 626 int rc; 627 /* 628 * Submit the READ first for COMPARE_AND_WRITE to perform the 629 * comparision using SGLs at cmd->t_bidi_data_sg.. 630 */ 631 rc = down_interruptible(&dev->caw_sem); 632 if (rc != 0) { 633 cmd->transport_complete_callback = NULL; 634 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 635 } 636 /* 637 * Reset cmd->data_length to individual block_size in order to not 638 * confuse backend drivers that depend on this value matching the 639 * size of the I/O being submitted. 640 */ 641 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 642 643 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 644 DMA_FROM_DEVICE); 645 if (ret) { 646 cmd->transport_complete_callback = NULL; 647 up(&dev->caw_sem); 648 return ret; 649 } 650 /* 651 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 652 * upon MISCOMPARE, or in compare_and_write_done() upon completion 653 * of WRITE instance user-data. 654 */ 655 return TCM_NO_SENSE; 656 } 657 658 static int 659 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 660 bool is_write, struct se_cmd *cmd) 661 { 662 if (is_write) { 663 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 664 protect ? TARGET_PROT_DOUT_PASS : 665 TARGET_PROT_DOUT_INSERT; 666 switch (protect) { 667 case 0x0: 668 case 0x3: 669 cmd->prot_checks = 0; 670 break; 671 case 0x1: 672 case 0x5: 673 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 674 if (prot_type == TARGET_DIF_TYPE1_PROT) 675 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 676 break; 677 case 0x2: 678 if (prot_type == TARGET_DIF_TYPE1_PROT) 679 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 680 break; 681 case 0x4: 682 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 683 break; 684 default: 685 pr_err("Unsupported protect field %d\n", protect); 686 return -EINVAL; 687 } 688 } else { 689 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 690 protect ? TARGET_PROT_DIN_PASS : 691 TARGET_PROT_DIN_STRIP; 692 switch (protect) { 693 case 0x0: 694 case 0x1: 695 case 0x5: 696 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 697 if (prot_type == TARGET_DIF_TYPE1_PROT) 698 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 699 break; 700 case 0x2: 701 if (prot_type == TARGET_DIF_TYPE1_PROT) 702 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 703 break; 704 case 0x3: 705 cmd->prot_checks = 0; 706 break; 707 case 0x4: 708 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 709 break; 710 default: 711 pr_err("Unsupported protect field %d\n", protect); 712 return -EINVAL; 713 } 714 } 715 716 return 0; 717 } 718 719 static sense_reason_t 720 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 721 u32 sectors, bool is_write) 722 { 723 u8 protect = cdb[1] >> 5; 724 int sp_ops = cmd->se_sess->sup_prot_ops; 725 int pi_prot_type = dev->dev_attrib.pi_prot_type; 726 bool fabric_prot = false; 727 728 if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 729 if (unlikely(protect && 730 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 731 pr_err("CDB contains protect bit, but device + fabric does" 732 " not advertise PROTECT=1 feature bit\n"); 733 return TCM_INVALID_CDB_FIELD; 734 } 735 if (cmd->prot_pto) 736 return TCM_NO_SENSE; 737 } 738 739 switch (dev->dev_attrib.pi_prot_type) { 740 case TARGET_DIF_TYPE3_PROT: 741 cmd->reftag_seed = 0xffffffff; 742 break; 743 case TARGET_DIF_TYPE2_PROT: 744 if (protect) 745 return TCM_INVALID_CDB_FIELD; 746 747 cmd->reftag_seed = cmd->t_task_lba; 748 break; 749 case TARGET_DIF_TYPE1_PROT: 750 cmd->reftag_seed = cmd->t_task_lba; 751 break; 752 case TARGET_DIF_TYPE0_PROT: 753 /* 754 * See if the fabric supports T10-PI, and the session has been 755 * configured to allow export PROTECT=1 feature bit with backend 756 * devices that don't support T10-PI. 757 */ 758 fabric_prot = is_write ? 759 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 760 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 761 762 if (fabric_prot && cmd->se_sess->sess_prot_type) { 763 pi_prot_type = cmd->se_sess->sess_prot_type; 764 break; 765 } 766 if (!protect) 767 return TCM_NO_SENSE; 768 fallthrough; 769 default: 770 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 771 "PROTECT: 0x%02x\n", cdb[0], protect); 772 return TCM_INVALID_CDB_FIELD; 773 } 774 775 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 776 return TCM_INVALID_CDB_FIELD; 777 778 cmd->prot_type = pi_prot_type; 779 cmd->prot_length = dev->prot_length * sectors; 780 781 /** 782 * In case protection information exists over the wire 783 * we modify command data length to describe pure data. 784 * The actual transfer length is data length + protection 785 * length 786 **/ 787 if (protect) 788 cmd->data_length = sectors * dev->dev_attrib.block_size; 789 790 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 791 "prot_op=%d prot_checks=%d\n", 792 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 793 cmd->prot_op, cmd->prot_checks); 794 795 return TCM_NO_SENSE; 796 } 797 798 static int 799 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 800 { 801 if (cdb[1] & 0x10) { 802 /* see explanation in spc_emulate_modesense */ 803 if (!target_check_fua(dev)) { 804 pr_err("Got CDB: 0x%02x with DPO bit set, but device" 805 " does not advertise support for DPO\n", cdb[0]); 806 return -EINVAL; 807 } 808 } 809 if (cdb[1] & 0x8) { 810 if (!target_check_fua(dev)) { 811 pr_err("Got CDB: 0x%02x with FUA bit set, but device" 812 " does not advertise support for FUA write\n", 813 cdb[0]); 814 return -EINVAL; 815 } 816 cmd->se_cmd_flags |= SCF_FUA; 817 } 818 return 0; 819 } 820 821 sense_reason_t 822 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 823 { 824 struct se_device *dev = cmd->se_dev; 825 unsigned char *cdb = cmd->t_task_cdb; 826 unsigned int size; 827 u32 sectors = 0; 828 sense_reason_t ret; 829 830 cmd->protocol_data = ops; 831 832 switch (cdb[0]) { 833 case READ_6: 834 sectors = transport_get_sectors_6(cdb); 835 cmd->t_task_lba = transport_lba_21(cdb); 836 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 837 cmd->execute_cmd = sbc_execute_rw; 838 break; 839 case READ_10: 840 sectors = transport_get_sectors_10(cdb); 841 cmd->t_task_lba = transport_lba_32(cdb); 842 843 if (sbc_check_dpofua(dev, cmd, cdb)) 844 return TCM_INVALID_CDB_FIELD; 845 846 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 847 if (ret) 848 return ret; 849 850 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 851 cmd->execute_cmd = sbc_execute_rw; 852 break; 853 case READ_12: 854 sectors = transport_get_sectors_12(cdb); 855 cmd->t_task_lba = transport_lba_32(cdb); 856 857 if (sbc_check_dpofua(dev, cmd, cdb)) 858 return TCM_INVALID_CDB_FIELD; 859 860 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 861 if (ret) 862 return ret; 863 864 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 865 cmd->execute_cmd = sbc_execute_rw; 866 break; 867 case READ_16: 868 sectors = transport_get_sectors_16(cdb); 869 cmd->t_task_lba = transport_lba_64(cdb); 870 871 if (sbc_check_dpofua(dev, cmd, cdb)) 872 return TCM_INVALID_CDB_FIELD; 873 874 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 875 if (ret) 876 return ret; 877 878 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 879 cmd->execute_cmd = sbc_execute_rw; 880 break; 881 case WRITE_6: 882 sectors = transport_get_sectors_6(cdb); 883 cmd->t_task_lba = transport_lba_21(cdb); 884 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 885 cmd->execute_cmd = sbc_execute_rw; 886 break; 887 case WRITE_10: 888 case WRITE_VERIFY: 889 sectors = transport_get_sectors_10(cdb); 890 cmd->t_task_lba = transport_lba_32(cdb); 891 892 if (sbc_check_dpofua(dev, cmd, cdb)) 893 return TCM_INVALID_CDB_FIELD; 894 895 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 896 if (ret) 897 return ret; 898 899 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 900 cmd->execute_cmd = sbc_execute_rw; 901 break; 902 case WRITE_12: 903 sectors = transport_get_sectors_12(cdb); 904 cmd->t_task_lba = transport_lba_32(cdb); 905 906 if (sbc_check_dpofua(dev, cmd, cdb)) 907 return TCM_INVALID_CDB_FIELD; 908 909 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 910 if (ret) 911 return ret; 912 913 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 914 cmd->execute_cmd = sbc_execute_rw; 915 break; 916 case WRITE_16: 917 case WRITE_VERIFY_16: 918 sectors = transport_get_sectors_16(cdb); 919 cmd->t_task_lba = transport_lba_64(cdb); 920 921 if (sbc_check_dpofua(dev, cmd, cdb)) 922 return TCM_INVALID_CDB_FIELD; 923 924 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 925 if (ret) 926 return ret; 927 928 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 929 cmd->execute_cmd = sbc_execute_rw; 930 break; 931 case XDWRITEREAD_10: 932 if (cmd->data_direction != DMA_TO_DEVICE || 933 !(cmd->se_cmd_flags & SCF_BIDI)) 934 return TCM_INVALID_CDB_FIELD; 935 sectors = transport_get_sectors_10(cdb); 936 937 if (sbc_check_dpofua(dev, cmd, cdb)) 938 return TCM_INVALID_CDB_FIELD; 939 940 cmd->t_task_lba = transport_lba_32(cdb); 941 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 942 943 /* 944 * Setup BIDI XOR callback to be run after I/O completion. 945 */ 946 cmd->execute_cmd = sbc_execute_rw; 947 cmd->transport_complete_callback = &xdreadwrite_callback; 948 break; 949 case VARIABLE_LENGTH_CMD: 950 { 951 u16 service_action = get_unaligned_be16(&cdb[8]); 952 switch (service_action) { 953 case XDWRITEREAD_32: 954 sectors = transport_get_sectors_32(cdb); 955 956 if (sbc_check_dpofua(dev, cmd, cdb)) 957 return TCM_INVALID_CDB_FIELD; 958 /* 959 * Use WRITE_32 and READ_32 opcodes for the emulated 960 * XDWRITE_READ_32 logic. 961 */ 962 cmd->t_task_lba = transport_lba_64_ext(cdb); 963 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 964 965 /* 966 * Setup BIDI XOR callback to be run during after I/O 967 * completion. 968 */ 969 cmd->execute_cmd = sbc_execute_rw; 970 cmd->transport_complete_callback = &xdreadwrite_callback; 971 break; 972 case WRITE_SAME_32: 973 sectors = transport_get_sectors_32(cdb); 974 if (!sectors) { 975 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 976 " supported\n"); 977 return TCM_INVALID_CDB_FIELD; 978 } 979 980 size = sbc_get_size(cmd, 1); 981 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 982 983 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 984 if (ret) 985 return ret; 986 break; 987 default: 988 pr_err("VARIABLE_LENGTH_CMD service action" 989 " 0x%04x not supported\n", service_action); 990 return TCM_UNSUPPORTED_SCSI_OPCODE; 991 } 992 break; 993 } 994 case COMPARE_AND_WRITE: 995 if (!dev->dev_attrib.emulate_caw) { 996 pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject COMPARE_AND_WRITE\n", 997 dev->se_hba->backend->ops->name, 998 config_item_name(&dev->dev_group.cg_item), 999 dev->t10_wwn.unit_serial); 1000 return TCM_UNSUPPORTED_SCSI_OPCODE; 1001 } 1002 sectors = cdb[13]; 1003 /* 1004 * Currently enforce COMPARE_AND_WRITE for a single sector 1005 */ 1006 if (sectors > 1) { 1007 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 1008 " than 1\n", sectors); 1009 return TCM_INVALID_CDB_FIELD; 1010 } 1011 if (sbc_check_dpofua(dev, cmd, cdb)) 1012 return TCM_INVALID_CDB_FIELD; 1013 1014 /* 1015 * Double size because we have two buffers, note that 1016 * zero is not an error.. 1017 */ 1018 size = 2 * sbc_get_size(cmd, sectors); 1019 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1020 cmd->t_task_nolb = sectors; 1021 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 1022 cmd->execute_cmd = sbc_compare_and_write; 1023 cmd->transport_complete_callback = compare_and_write_callback; 1024 break; 1025 case READ_CAPACITY: 1026 size = READ_CAP_LEN; 1027 cmd->execute_cmd = sbc_emulate_readcapacity; 1028 break; 1029 case SERVICE_ACTION_IN_16: 1030 switch (cmd->t_task_cdb[1] & 0x1f) { 1031 case SAI_READ_CAPACITY_16: 1032 cmd->execute_cmd = sbc_emulate_readcapacity_16; 1033 break; 1034 case SAI_REPORT_REFERRALS: 1035 cmd->execute_cmd = target_emulate_report_referrals; 1036 break; 1037 default: 1038 pr_err("Unsupported SA: 0x%02x\n", 1039 cmd->t_task_cdb[1] & 0x1f); 1040 return TCM_INVALID_CDB_FIELD; 1041 } 1042 size = get_unaligned_be32(&cdb[10]); 1043 break; 1044 case SYNCHRONIZE_CACHE: 1045 case SYNCHRONIZE_CACHE_16: 1046 if (cdb[0] == SYNCHRONIZE_CACHE) { 1047 sectors = transport_get_sectors_10(cdb); 1048 cmd->t_task_lba = transport_lba_32(cdb); 1049 } else { 1050 sectors = transport_get_sectors_16(cdb); 1051 cmd->t_task_lba = transport_lba_64(cdb); 1052 } 1053 if (ops->execute_sync_cache) { 1054 cmd->execute_cmd = ops->execute_sync_cache; 1055 goto check_lba; 1056 } 1057 size = 0; 1058 cmd->execute_cmd = sbc_emulate_noop; 1059 break; 1060 case UNMAP: 1061 if (!ops->execute_unmap) 1062 return TCM_UNSUPPORTED_SCSI_OPCODE; 1063 1064 if (!dev->dev_attrib.emulate_tpu) { 1065 pr_err("Got UNMAP, but backend device has" 1066 " emulate_tpu disabled\n"); 1067 return TCM_UNSUPPORTED_SCSI_OPCODE; 1068 } 1069 size = get_unaligned_be16(&cdb[7]); 1070 cmd->execute_cmd = sbc_execute_unmap; 1071 break; 1072 case WRITE_SAME_16: 1073 sectors = transport_get_sectors_16(cdb); 1074 if (!sectors) { 1075 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1076 return TCM_INVALID_CDB_FIELD; 1077 } 1078 1079 size = sbc_get_size(cmd, 1); 1080 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1081 1082 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1083 if (ret) 1084 return ret; 1085 break; 1086 case WRITE_SAME: 1087 sectors = transport_get_sectors_10(cdb); 1088 if (!sectors) { 1089 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1090 return TCM_INVALID_CDB_FIELD; 1091 } 1092 1093 size = sbc_get_size(cmd, 1); 1094 cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1095 1096 /* 1097 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1098 * of byte 1 bit 3 UNMAP instead of original reserved field 1099 */ 1100 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1101 if (ret) 1102 return ret; 1103 break; 1104 case VERIFY: 1105 case VERIFY_16: 1106 size = 0; 1107 if (cdb[0] == VERIFY) { 1108 sectors = transport_get_sectors_10(cdb); 1109 cmd->t_task_lba = transport_lba_32(cdb); 1110 } else { 1111 sectors = transport_get_sectors_16(cdb); 1112 cmd->t_task_lba = transport_lba_64(cdb); 1113 } 1114 cmd->execute_cmd = sbc_emulate_noop; 1115 goto check_lba; 1116 case REZERO_UNIT: 1117 case SEEK_6: 1118 case SEEK_10: 1119 /* 1120 * There are still clients out there which use these old SCSI-2 1121 * commands. This mainly happens when running VMs with legacy 1122 * guest systems, connected via SCSI command pass-through to 1123 * iSCSI targets. Make them happy and return status GOOD. 1124 */ 1125 size = 0; 1126 cmd->execute_cmd = sbc_emulate_noop; 1127 break; 1128 case START_STOP: 1129 size = 0; 1130 cmd->execute_cmd = sbc_emulate_startstop; 1131 break; 1132 default: 1133 ret = spc_parse_cdb(cmd, &size); 1134 if (ret) 1135 return ret; 1136 } 1137 1138 /* reject any command that we don't have a handler for */ 1139 if (!cmd->execute_cmd) 1140 return TCM_UNSUPPORTED_SCSI_OPCODE; 1141 1142 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 1143 unsigned long long end_lba; 1144 check_lba: 1145 end_lba = dev->transport->get_blocks(dev) + 1; 1146 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1147 ((cmd->t_task_lba + sectors) > end_lba)) { 1148 pr_err("cmd exceeds last lba %llu " 1149 "(lba %llu, sectors %u)\n", 1150 end_lba, cmd->t_task_lba, sectors); 1151 return TCM_ADDRESS_OUT_OF_RANGE; 1152 } 1153 1154 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 1155 size = sbc_get_size(cmd, sectors); 1156 } 1157 1158 return target_cmd_size_check(cmd, size); 1159 } 1160 EXPORT_SYMBOL(sbc_parse_cdb); 1161 1162 u32 sbc_get_device_type(struct se_device *dev) 1163 { 1164 return TYPE_DISK; 1165 } 1166 EXPORT_SYMBOL(sbc_get_device_type); 1167 1168 static sense_reason_t 1169 sbc_execute_unmap(struct se_cmd *cmd) 1170 { 1171 struct sbc_ops *ops = cmd->protocol_data; 1172 struct se_device *dev = cmd->se_dev; 1173 unsigned char *buf, *ptr = NULL; 1174 sector_t lba; 1175 int size; 1176 u32 range; 1177 sense_reason_t ret = 0; 1178 int dl, bd_dl; 1179 1180 /* We never set ANC_SUP */ 1181 if (cmd->t_task_cdb[1]) 1182 return TCM_INVALID_CDB_FIELD; 1183 1184 if (cmd->data_length == 0) { 1185 target_complete_cmd(cmd, SAM_STAT_GOOD); 1186 return 0; 1187 } 1188 1189 if (cmd->data_length < 8) { 1190 pr_warn("UNMAP parameter list length %u too small\n", 1191 cmd->data_length); 1192 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1193 } 1194 1195 buf = transport_kmap_data_sg(cmd); 1196 if (!buf) 1197 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1198 1199 dl = get_unaligned_be16(&buf[0]); 1200 bd_dl = get_unaligned_be16(&buf[2]); 1201 1202 size = cmd->data_length - 8; 1203 if (bd_dl > size) 1204 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1205 cmd->data_length, bd_dl); 1206 else 1207 size = bd_dl; 1208 1209 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1210 ret = TCM_INVALID_PARAMETER_LIST; 1211 goto err; 1212 } 1213 1214 /* First UNMAP block descriptor starts at 8 byte offset */ 1215 ptr = &buf[8]; 1216 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1217 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1218 1219 while (size >= 16) { 1220 lba = get_unaligned_be64(&ptr[0]); 1221 range = get_unaligned_be32(&ptr[8]); 1222 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1223 (unsigned long long)lba, range); 1224 1225 if (range > dev->dev_attrib.max_unmap_lba_count) { 1226 ret = TCM_INVALID_PARAMETER_LIST; 1227 goto err; 1228 } 1229 1230 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1231 ret = TCM_ADDRESS_OUT_OF_RANGE; 1232 goto err; 1233 } 1234 1235 if (range) { 1236 ret = ops->execute_unmap(cmd, lba, range); 1237 if (ret) 1238 goto err; 1239 } 1240 1241 ptr += 16; 1242 size -= 16; 1243 } 1244 1245 err: 1246 transport_kunmap_data_sg(cmd); 1247 if (!ret) 1248 target_complete_cmd(cmd, GOOD); 1249 return ret; 1250 } 1251 1252 void 1253 sbc_dif_generate(struct se_cmd *cmd) 1254 { 1255 struct se_device *dev = cmd->se_dev; 1256 struct t10_pi_tuple *sdt; 1257 struct scatterlist *dsg = cmd->t_data_sg, *psg; 1258 sector_t sector = cmd->t_task_lba; 1259 void *daddr, *paddr; 1260 int i, j, offset = 0; 1261 unsigned int block_size = dev->dev_attrib.block_size; 1262 1263 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1264 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1265 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1266 1267 for (j = 0; j < psg->length; 1268 j += sizeof(*sdt)) { 1269 __u16 crc; 1270 unsigned int avail; 1271 1272 if (offset >= dsg->length) { 1273 offset -= dsg->length; 1274 kunmap_atomic(daddr - dsg->offset); 1275 dsg = sg_next(dsg); 1276 if (!dsg) { 1277 kunmap_atomic(paddr - psg->offset); 1278 return; 1279 } 1280 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1281 } 1282 1283 sdt = paddr + j; 1284 avail = min(block_size, dsg->length - offset); 1285 crc = crc_t10dif(daddr + offset, avail); 1286 if (avail < block_size) { 1287 kunmap_atomic(daddr - dsg->offset); 1288 dsg = sg_next(dsg); 1289 if (!dsg) { 1290 kunmap_atomic(paddr - psg->offset); 1291 return; 1292 } 1293 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1294 offset = block_size - avail; 1295 crc = crc_t10dif_update(crc, daddr, offset); 1296 } else { 1297 offset += block_size; 1298 } 1299 1300 sdt->guard_tag = cpu_to_be16(crc); 1301 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 1302 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 1303 sdt->app_tag = 0; 1304 1305 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 1306 " app_tag: 0x%04x ref_tag: %u\n", 1307 (cmd->data_direction == DMA_TO_DEVICE) ? 1308 "WRITE" : "READ", (unsigned long long)sector, 1309 sdt->guard_tag, sdt->app_tag, 1310 be32_to_cpu(sdt->ref_tag)); 1311 1312 sector++; 1313 } 1314 1315 kunmap_atomic(daddr - dsg->offset); 1316 kunmap_atomic(paddr - psg->offset); 1317 } 1318 } 1319 1320 static sense_reason_t 1321 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, 1322 __u16 crc, sector_t sector, unsigned int ei_lba) 1323 { 1324 __be16 csum; 1325 1326 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1327 goto check_ref; 1328 1329 csum = cpu_to_be16(crc); 1330 1331 if (sdt->guard_tag != csum) { 1332 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1333 " csum 0x%04x\n", (unsigned long long)sector, 1334 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1335 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1336 } 1337 1338 check_ref: 1339 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1340 return 0; 1341 1342 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 1343 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1344 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1345 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1346 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1347 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1348 } 1349 1350 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 1351 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1352 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1353 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1354 be32_to_cpu(sdt->ref_tag), ei_lba); 1355 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1356 } 1357 1358 return 0; 1359 } 1360 1361 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1362 struct scatterlist *sg, int sg_off) 1363 { 1364 struct se_device *dev = cmd->se_dev; 1365 struct scatterlist *psg; 1366 void *paddr, *addr; 1367 unsigned int i, len, left; 1368 unsigned int offset = sg_off; 1369 1370 if (!sg) 1371 return; 1372 1373 left = sectors * dev->prot_length; 1374 1375 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1376 unsigned int psg_len, copied = 0; 1377 1378 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1379 psg_len = min(left, psg->length); 1380 while (psg_len) { 1381 len = min(psg_len, sg->length - offset); 1382 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1383 1384 if (read) 1385 memcpy(paddr + copied, addr, len); 1386 else 1387 memcpy(addr, paddr + copied, len); 1388 1389 left -= len; 1390 offset += len; 1391 copied += len; 1392 psg_len -= len; 1393 1394 kunmap_atomic(addr - sg->offset - offset); 1395 1396 if (offset >= sg->length) { 1397 sg = sg_next(sg); 1398 offset = 0; 1399 } 1400 } 1401 kunmap_atomic(paddr - psg->offset); 1402 } 1403 } 1404 EXPORT_SYMBOL(sbc_dif_copy_prot); 1405 1406 sense_reason_t 1407 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1408 unsigned int ei_lba, struct scatterlist *psg, int psg_off) 1409 { 1410 struct se_device *dev = cmd->se_dev; 1411 struct t10_pi_tuple *sdt; 1412 struct scatterlist *dsg = cmd->t_data_sg; 1413 sector_t sector = start; 1414 void *daddr, *paddr; 1415 int i; 1416 sense_reason_t rc; 1417 int dsg_off = 0; 1418 unsigned int block_size = dev->dev_attrib.block_size; 1419 1420 for (; psg && sector < start + sectors; psg = sg_next(psg)) { 1421 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1422 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1423 1424 for (i = psg_off; i < psg->length && 1425 sector < start + sectors; 1426 i += sizeof(*sdt)) { 1427 __u16 crc; 1428 unsigned int avail; 1429 1430 if (dsg_off >= dsg->length) { 1431 dsg_off -= dsg->length; 1432 kunmap_atomic(daddr - dsg->offset); 1433 dsg = sg_next(dsg); 1434 if (!dsg) { 1435 kunmap_atomic(paddr - psg->offset); 1436 return 0; 1437 } 1438 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1439 } 1440 1441 sdt = paddr + i; 1442 1443 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1444 " app_tag: 0x%04x ref_tag: %u\n", 1445 (unsigned long long)sector, sdt->guard_tag, 1446 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1447 1448 if (sdt->app_tag == T10_PI_APP_ESCAPE) { 1449 dsg_off += block_size; 1450 goto next; 1451 } 1452 1453 avail = min(block_size, dsg->length - dsg_off); 1454 crc = crc_t10dif(daddr + dsg_off, avail); 1455 if (avail < block_size) { 1456 kunmap_atomic(daddr - dsg->offset); 1457 dsg = sg_next(dsg); 1458 if (!dsg) { 1459 kunmap_atomic(paddr - psg->offset); 1460 return 0; 1461 } 1462 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1463 dsg_off = block_size - avail; 1464 crc = crc_t10dif_update(crc, daddr, dsg_off); 1465 } else { 1466 dsg_off += block_size; 1467 } 1468 1469 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 1470 if (rc) { 1471 kunmap_atomic(daddr - dsg->offset); 1472 kunmap_atomic(paddr - psg->offset); 1473 cmd->sense_info = sector; 1474 return rc; 1475 } 1476 next: 1477 sector++; 1478 ei_lba++; 1479 } 1480 1481 psg_off = 0; 1482 kunmap_atomic(daddr - dsg->offset); 1483 kunmap_atomic(paddr - psg->offset); 1484 } 1485 1486 return 0; 1487 } 1488 EXPORT_SYMBOL(sbc_dif_verify); 1489