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 <linux/t10-pi.h> 28 #include <asm/unaligned.h> 29 #include <scsi/scsi_proto.h> 30 #include <scsi/scsi_tcq.h> 31 32 #include <target/target_core_base.h> 33 #include <target/target_core_backend.h> 34 #include <target/target_core_fabric.h> 35 36 #include "target_core_internal.h" 37 #include "target_core_ua.h" 38 #include "target_core_alua.h" 39 40 static sense_reason_t 41 sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); 42 static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); 43 44 static sense_reason_t 45 sbc_emulate_readcapacity(struct se_cmd *cmd) 46 { 47 struct se_device *dev = cmd->se_dev; 48 unsigned char *cdb = cmd->t_task_cdb; 49 unsigned long long blocks_long = dev->transport->get_blocks(dev); 50 unsigned char *rbuf; 51 unsigned char buf[8]; 52 u32 blocks; 53 54 /* 55 * SBC-2 says: 56 * If the PMI bit is set to zero and the LOGICAL BLOCK 57 * ADDRESS field is not set to zero, the device server shall 58 * terminate the command with CHECK CONDITION status with 59 * the sense key set to ILLEGAL REQUEST and the additional 60 * sense code set to INVALID FIELD IN CDB. 61 * 62 * In SBC-3, these fields are obsolete, but some SCSI 63 * compliance tests actually check this, so we might as well 64 * follow SBC-2. 65 */ 66 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 67 return TCM_INVALID_CDB_FIELD; 68 69 if (blocks_long >= 0x00000000ffffffff) 70 blocks = 0xffffffff; 71 else 72 blocks = (u32)blocks_long; 73 74 put_unaligned_be32(blocks, &buf[0]); 75 put_unaligned_be32(dev->dev_attrib.block_size, &buf[4]); 76 77 rbuf = transport_kmap_data_sg(cmd); 78 if (rbuf) { 79 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 80 transport_kunmap_data_sg(cmd); 81 } 82 83 target_complete_cmd_with_length(cmd, GOOD, 8); 84 return 0; 85 } 86 87 static sense_reason_t 88 sbc_emulate_readcapacity_16(struct se_cmd *cmd) 89 { 90 struct se_device *dev = cmd->se_dev; 91 struct se_session *sess = cmd->se_sess; 92 int pi_prot_type = dev->dev_attrib.pi_prot_type; 93 94 unsigned char *rbuf; 95 unsigned char buf[32]; 96 unsigned long long blocks = dev->transport->get_blocks(dev); 97 98 memset(buf, 0, sizeof(buf)); 99 put_unaligned_be64(blocks, &buf[0]); 100 put_unaligned_be32(dev->dev_attrib.block_size, &buf[8]); 101 /* 102 * Set P_TYPE and PROT_EN bits for DIF support 103 */ 104 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 105 /* 106 * Only override a device's pi_prot_type if no T10-PI is 107 * available, and sess_prot_type has been explicitly enabled. 108 */ 109 if (!pi_prot_type) 110 pi_prot_type = sess->sess_prot_type; 111 112 if (pi_prot_type) 113 buf[12] = (pi_prot_type - 1) << 1 | 0x1; 114 } 115 116 if (dev->transport->get_lbppbe) 117 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 118 119 if (dev->transport->get_alignment_offset_lbas) { 120 u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 121 122 put_unaligned_be16(lalba, &buf[14]); 123 } 124 125 /* 126 * Set Thin Provisioning Enable bit following sbc3r22 in section 127 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 128 */ 129 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { 130 buf[14] |= 0x80; 131 132 /* 133 * LBPRZ signifies that zeroes will be read back from an LBA after 134 * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) 135 */ 136 if (dev->dev_attrib.unmap_zeroes_data) 137 buf[14] |= 0x40; 138 } 139 140 rbuf = transport_kmap_data_sg(cmd); 141 if (rbuf) { 142 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 143 transport_kunmap_data_sg(cmd); 144 } 145 146 target_complete_cmd_with_length(cmd, GOOD, 32); 147 return 0; 148 } 149 150 static sense_reason_t 151 sbc_emulate_startstop(struct se_cmd *cmd) 152 { 153 unsigned char *cdb = cmd->t_task_cdb; 154 155 /* 156 * See sbc3r36 section 5.25 157 * Immediate bit should be set since there is nothing to complete 158 * POWER CONDITION MODIFIER 0h 159 */ 160 if (!(cdb[1] & 1) || cdb[2] || cdb[3]) 161 return TCM_INVALID_CDB_FIELD; 162 163 /* 164 * See sbc3r36 section 5.25 165 * POWER CONDITION 0h START_VALID - process START and LOEJ 166 */ 167 if (cdb[4] >> 4 & 0xf) 168 return TCM_INVALID_CDB_FIELD; 169 170 /* 171 * See sbc3r36 section 5.25 172 * LOEJ 0h - nothing to load or unload 173 * START 1h - we are ready 174 */ 175 if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) 176 return TCM_INVALID_CDB_FIELD; 177 178 target_complete_cmd(cmd, SAM_STAT_GOOD); 179 return 0; 180 } 181 182 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 183 { 184 u32 num_blocks; 185 186 if (cmd->t_task_cdb[0] == WRITE_SAME) 187 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 188 else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 189 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 190 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 191 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 192 193 /* 194 * Use the explicit range when non zero is supplied, otherwise calculate 195 * the remaining range based on ->get_blocks() - starting LBA. 196 */ 197 if (num_blocks) 198 return num_blocks; 199 200 return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 201 cmd->t_task_lba + 1; 202 } 203 EXPORT_SYMBOL(sbc_get_write_same_sectors); 204 205 static sense_reason_t 206 sbc_execute_write_same_unmap(struct se_cmd *cmd) 207 { 208 struct sbc_ops *ops = cmd->protocol_data; 209 sector_t nolb = sbc_get_write_same_sectors(cmd); 210 sense_reason_t ret; 211 212 if (nolb) { 213 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); 214 if (ret) 215 return ret; 216 } 217 218 target_complete_cmd(cmd, GOOD); 219 return 0; 220 } 221 222 static sense_reason_t 223 sbc_emulate_noop(struct se_cmd *cmd) 224 { 225 target_complete_cmd(cmd, GOOD); 226 return 0; 227 } 228 229 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 230 { 231 return cmd->se_dev->dev_attrib.block_size * sectors; 232 } 233 234 static inline u32 transport_get_sectors_6(unsigned char *cdb) 235 { 236 /* 237 * Use 8-bit sector value. SBC-3 says: 238 * 239 * A TRANSFER LENGTH field set to zero specifies that 256 240 * logical blocks shall be written. Any other value 241 * specifies the number of logical blocks that shall be 242 * written. 243 */ 244 return cdb[4] ? : 256; 245 } 246 247 static inline u32 transport_get_sectors_10(unsigned char *cdb) 248 { 249 return get_unaligned_be16(&cdb[7]); 250 } 251 252 static inline u32 transport_get_sectors_12(unsigned char *cdb) 253 { 254 return get_unaligned_be32(&cdb[6]); 255 } 256 257 static inline u32 transport_get_sectors_16(unsigned char *cdb) 258 { 259 return get_unaligned_be32(&cdb[10]); 260 } 261 262 /* 263 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 264 */ 265 static inline u32 transport_get_sectors_32(unsigned char *cdb) 266 { 267 return get_unaligned_be32(&cdb[28]); 268 269 } 270 271 static inline u32 transport_lba_21(unsigned char *cdb) 272 { 273 return get_unaligned_be24(&cdb[1]) & 0x1fffff; 274 } 275 276 static inline u32 transport_lba_32(unsigned char *cdb) 277 { 278 return get_unaligned_be32(&cdb[2]); 279 } 280 281 static inline unsigned long long transport_lba_64(unsigned char *cdb) 282 { 283 return get_unaligned_be64(&cdb[2]); 284 } 285 286 /* 287 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 288 */ 289 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 290 { 291 return get_unaligned_be64(&cdb[12]); 292 } 293 294 static sense_reason_t 295 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 296 { 297 struct se_device *dev = cmd->se_dev; 298 sector_t end_lba = dev->transport->get_blocks(dev) + 1; 299 unsigned int sectors = sbc_get_write_same_sectors(cmd); 300 sense_reason_t ret; 301 302 if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 303 pr_err("WRITE_SAME PBDATA and LBDATA" 304 " bits not supported for Block Discard" 305 " Emulation\n"); 306 return TCM_UNSUPPORTED_SCSI_OPCODE; 307 } 308 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 309 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 310 sectors, cmd->se_dev->dev_attrib.max_write_same_len); 311 return TCM_INVALID_CDB_FIELD; 312 } 313 /* 314 * Sanity check for LBA wrap and request past end of device. 315 */ 316 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 317 ((cmd->t_task_lba + sectors) > end_lba)) { 318 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 319 (unsigned long long)end_lba, cmd->t_task_lba, sectors); 320 return TCM_ADDRESS_OUT_OF_RANGE; 321 } 322 323 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 324 if (flags[0] & 0x10) { 325 pr_warn("WRITE SAME with ANCHOR not supported\n"); 326 return TCM_INVALID_CDB_FIELD; 327 } 328 /* 329 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 330 * translated into block discard requests within backend code. 331 */ 332 if (flags[0] & 0x08) { 333 if (!ops->execute_unmap) 334 return TCM_UNSUPPORTED_SCSI_OPCODE; 335 336 if (!dev->dev_attrib.emulate_tpws) { 337 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" 338 " has emulate_tpws disabled\n"); 339 return TCM_UNSUPPORTED_SCSI_OPCODE; 340 } 341 cmd->execute_cmd = sbc_execute_write_same_unmap; 342 return 0; 343 } 344 if (!ops->execute_write_same) 345 return TCM_UNSUPPORTED_SCSI_OPCODE; 346 347 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); 348 if (ret) 349 return ret; 350 351 cmd->execute_cmd = ops->execute_write_same; 352 return 0; 353 } 354 355 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, 356 int *post_ret) 357 { 358 unsigned char *buf, *addr; 359 struct scatterlist *sg; 360 unsigned int offset; 361 sense_reason_t ret = TCM_NO_SENSE; 362 int i, count; 363 364 if (!success) 365 return 0; 366 367 /* 368 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 369 * 370 * 1) read the specified logical block(s); 371 * 2) transfer logical blocks from the data-out buffer; 372 * 3) XOR the logical blocks transferred from the data-out buffer with 373 * the logical blocks read, storing the resulting XOR data in a buffer; 374 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 375 * blocks transferred from the data-out buffer; and 376 * 5) transfer the resulting XOR data to the data-in buffer. 377 */ 378 buf = kmalloc(cmd->data_length, GFP_KERNEL); 379 if (!buf) { 380 pr_err("Unable to allocate xor_callback buf\n"); 381 return TCM_OUT_OF_RESOURCES; 382 } 383 /* 384 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 385 * into the locally allocated *buf 386 */ 387 sg_copy_to_buffer(cmd->t_data_sg, 388 cmd->t_data_nents, 389 buf, 390 cmd->data_length); 391 392 /* 393 * Now perform the XOR against the BIDI read memory located at 394 * cmd->t_mem_bidi_list 395 */ 396 397 offset = 0; 398 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 399 addr = kmap_atomic(sg_page(sg)); 400 if (!addr) { 401 ret = TCM_OUT_OF_RESOURCES; 402 goto out; 403 } 404 405 for (i = 0; i < sg->length; i++) 406 *(addr + sg->offset + i) ^= *(buf + offset + i); 407 408 offset += sg->length; 409 kunmap_atomic(addr); 410 } 411 412 out: 413 kfree(buf); 414 return ret; 415 } 416 417 static sense_reason_t 418 sbc_execute_rw(struct se_cmd *cmd) 419 { 420 struct sbc_ops *ops = cmd->protocol_data; 421 422 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 423 cmd->data_direction); 424 } 425 426 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, 427 int *post_ret) 428 { 429 struct se_device *dev = cmd->se_dev; 430 sense_reason_t ret = TCM_NO_SENSE; 431 432 spin_lock_irq(&cmd->t_state_lock); 433 if (success) { 434 *post_ret = 1; 435 436 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 437 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 438 } 439 spin_unlock_irq(&cmd->t_state_lock); 440 441 /* 442 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 443 * before the original READ I/O submission. 444 */ 445 up(&dev->caw_sem); 446 447 return ret; 448 } 449 450 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, 451 int *post_ret) 452 { 453 struct se_device *dev = cmd->se_dev; 454 struct sg_table write_tbl = { }; 455 struct scatterlist *write_sg, *sg; 456 unsigned char *buf = NULL, *addr; 457 struct sg_mapping_iter m; 458 unsigned int offset = 0, len; 459 unsigned int nlbas = cmd->t_task_nolb; 460 unsigned int block_size = dev->dev_attrib.block_size; 461 unsigned int compare_len = (nlbas * block_size); 462 sense_reason_t ret = TCM_NO_SENSE; 463 int rc, i; 464 465 /* 466 * Handle early failure in transport_generic_request_failure(), 467 * which will not have taken ->caw_sem yet.. 468 */ 469 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 470 return TCM_NO_SENSE; 471 /* 472 * Handle special case for zero-length COMPARE_AND_WRITE 473 */ 474 if (!cmd->data_length) 475 goto out; 476 /* 477 * Immediately exit + release dev->caw_sem if command has already 478 * been failed with a non-zero SCSI status. 479 */ 480 if (cmd->scsi_status) { 481 pr_debug("compare_and_write_callback: non zero scsi_status:" 482 " 0x%02x\n", cmd->scsi_status); 483 *post_ret = 1; 484 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 485 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 486 goto out; 487 } 488 489 buf = kzalloc(cmd->data_length, GFP_KERNEL); 490 if (!buf) { 491 pr_err("Unable to allocate compare_and_write buf\n"); 492 ret = TCM_OUT_OF_RESOURCES; 493 goto out; 494 } 495 496 if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) { 497 pr_err("Unable to allocate compare_and_write sg\n"); 498 ret = TCM_OUT_OF_RESOURCES; 499 goto out; 500 } 501 write_sg = write_tbl.sgl; 502 /* 503 * Setup verify and write data payloads from total NumberLBAs. 504 */ 505 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 506 cmd->data_length); 507 if (!rc) { 508 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 509 ret = TCM_OUT_OF_RESOURCES; 510 goto out; 511 } 512 /* 513 * Compare against SCSI READ payload against verify payload 514 */ 515 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 516 addr = (unsigned char *)kmap_atomic(sg_page(sg)); 517 if (!addr) { 518 ret = TCM_OUT_OF_RESOURCES; 519 goto out; 520 } 521 522 len = min(sg->length, compare_len); 523 524 if (memcmp(addr, buf + offset, len)) { 525 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 526 addr, buf + offset); 527 kunmap_atomic(addr); 528 goto miscompare; 529 } 530 kunmap_atomic(addr); 531 532 offset += len; 533 compare_len -= len; 534 if (!compare_len) 535 break; 536 } 537 538 i = 0; 539 len = cmd->t_task_nolb * block_size; 540 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 541 /* 542 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 543 */ 544 while (len) { 545 sg_miter_next(&m); 546 547 if (block_size < PAGE_SIZE) { 548 sg_set_page(&write_sg[i], m.page, block_size, 549 m.piter.sg->offset + block_size); 550 } else { 551 sg_miter_next(&m); 552 sg_set_page(&write_sg[i], m.page, block_size, 553 m.piter.sg->offset); 554 } 555 len -= block_size; 556 i++; 557 } 558 sg_miter_stop(&m); 559 /* 560 * Save the original SGL + nents values before updating to new 561 * assignments, to be released in transport_free_pages() -> 562 * transport_reset_sgl_orig() 563 */ 564 cmd->t_data_sg_orig = cmd->t_data_sg; 565 cmd->t_data_sg = write_sg; 566 cmd->t_data_nents_orig = cmd->t_data_nents; 567 cmd->t_data_nents = 1; 568 569 cmd->sam_task_attr = TCM_HEAD_TAG; 570 cmd->transport_complete_callback = compare_and_write_post; 571 /* 572 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 573 * for submitting the adjusted SGL to write instance user-data. 574 */ 575 cmd->execute_cmd = sbc_execute_rw; 576 577 spin_lock_irq(&cmd->t_state_lock); 578 cmd->t_state = TRANSPORT_PROCESSING; 579 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; 580 spin_unlock_irq(&cmd->t_state_lock); 581 582 __target_execute_cmd(cmd, false); 583 584 kfree(buf); 585 return ret; 586 587 miscompare: 588 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 589 dev->transport->name); 590 ret = TCM_MISCOMPARE_VERIFY; 591 out: 592 /* 593 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 594 * sbc_compare_and_write() before the original READ I/O submission. 595 */ 596 up(&dev->caw_sem); 597 sg_free_table(&write_tbl); 598 kfree(buf); 599 return ret; 600 } 601 602 static sense_reason_t 603 sbc_compare_and_write(struct se_cmd *cmd) 604 { 605 struct sbc_ops *ops = cmd->protocol_data; 606 struct se_device *dev = cmd->se_dev; 607 sense_reason_t ret; 608 int rc; 609 /* 610 * Submit the READ first for COMPARE_AND_WRITE to perform the 611 * comparision using SGLs at cmd->t_bidi_data_sg.. 612 */ 613 rc = down_interruptible(&dev->caw_sem); 614 if (rc != 0) { 615 cmd->transport_complete_callback = NULL; 616 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 617 } 618 /* 619 * Reset cmd->data_length to individual block_size in order to not 620 * confuse backend drivers that depend on this value matching the 621 * size of the I/O being submitted. 622 */ 623 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 624 625 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 626 DMA_FROM_DEVICE); 627 if (ret) { 628 cmd->transport_complete_callback = NULL; 629 up(&dev->caw_sem); 630 return ret; 631 } 632 /* 633 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 634 * upon MISCOMPARE, or in compare_and_write_done() upon completion 635 * of WRITE instance user-data. 636 */ 637 return TCM_NO_SENSE; 638 } 639 640 static int 641 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 642 bool is_write, struct se_cmd *cmd) 643 { 644 if (is_write) { 645 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 646 protect ? TARGET_PROT_DOUT_PASS : 647 TARGET_PROT_DOUT_INSERT; 648 switch (protect) { 649 case 0x0: 650 case 0x3: 651 cmd->prot_checks = 0; 652 break; 653 case 0x1: 654 case 0x5: 655 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 656 if (prot_type == TARGET_DIF_TYPE1_PROT) 657 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 658 break; 659 case 0x2: 660 if (prot_type == TARGET_DIF_TYPE1_PROT) 661 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 662 break; 663 case 0x4: 664 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 665 break; 666 default: 667 pr_err("Unsupported protect field %d\n", protect); 668 return -EINVAL; 669 } 670 } else { 671 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 672 protect ? TARGET_PROT_DIN_PASS : 673 TARGET_PROT_DIN_STRIP; 674 switch (protect) { 675 case 0x0: 676 case 0x1: 677 case 0x5: 678 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 679 if (prot_type == TARGET_DIF_TYPE1_PROT) 680 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 681 break; 682 case 0x2: 683 if (prot_type == TARGET_DIF_TYPE1_PROT) 684 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 685 break; 686 case 0x3: 687 cmd->prot_checks = 0; 688 break; 689 case 0x4: 690 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 691 break; 692 default: 693 pr_err("Unsupported protect field %d\n", protect); 694 return -EINVAL; 695 } 696 } 697 698 return 0; 699 } 700 701 static sense_reason_t 702 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 703 u32 sectors, bool is_write) 704 { 705 u8 protect = cdb[1] >> 5; 706 int sp_ops = cmd->se_sess->sup_prot_ops; 707 int pi_prot_type = dev->dev_attrib.pi_prot_type; 708 bool fabric_prot = false; 709 710 if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 711 if (unlikely(protect && 712 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 713 pr_err("CDB contains protect bit, but device + fabric does" 714 " not advertise PROTECT=1 feature bit\n"); 715 return TCM_INVALID_CDB_FIELD; 716 } 717 if (cmd->prot_pto) 718 return TCM_NO_SENSE; 719 } 720 721 switch (dev->dev_attrib.pi_prot_type) { 722 case TARGET_DIF_TYPE3_PROT: 723 cmd->reftag_seed = 0xffffffff; 724 break; 725 case TARGET_DIF_TYPE2_PROT: 726 if (protect) 727 return TCM_INVALID_CDB_FIELD; 728 729 cmd->reftag_seed = cmd->t_task_lba; 730 break; 731 case TARGET_DIF_TYPE1_PROT: 732 cmd->reftag_seed = cmd->t_task_lba; 733 break; 734 case TARGET_DIF_TYPE0_PROT: 735 /* 736 * See if the fabric supports T10-PI, and the session has been 737 * configured to allow export PROTECT=1 feature bit with backend 738 * devices that don't support T10-PI. 739 */ 740 fabric_prot = is_write ? 741 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 742 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 743 744 if (fabric_prot && cmd->se_sess->sess_prot_type) { 745 pi_prot_type = cmd->se_sess->sess_prot_type; 746 break; 747 } 748 if (!protect) 749 return TCM_NO_SENSE; 750 /* Fallthrough */ 751 default: 752 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 753 "PROTECT: 0x%02x\n", cdb[0], protect); 754 return TCM_INVALID_CDB_FIELD; 755 } 756 757 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 758 return TCM_INVALID_CDB_FIELD; 759 760 cmd->prot_type = pi_prot_type; 761 cmd->prot_length = dev->prot_length * sectors; 762 763 /** 764 * In case protection information exists over the wire 765 * we modify command data length to describe pure data. 766 * The actual transfer length is data length + protection 767 * length 768 **/ 769 if (protect) 770 cmd->data_length = sectors * dev->dev_attrib.block_size; 771 772 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 773 "prot_op=%d prot_checks=%d\n", 774 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 775 cmd->prot_op, cmd->prot_checks); 776 777 return TCM_NO_SENSE; 778 } 779 780 static int 781 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 782 { 783 if (cdb[1] & 0x10) { 784 /* see explanation in spc_emulate_modesense */ 785 if (!target_check_fua(dev)) { 786 pr_err("Got CDB: 0x%02x with DPO bit set, but device" 787 " does not advertise support for DPO\n", cdb[0]); 788 return -EINVAL; 789 } 790 } 791 if (cdb[1] & 0x8) { 792 if (!target_check_fua(dev)) { 793 pr_err("Got CDB: 0x%02x with FUA bit set, but device" 794 " does not advertise support for FUA write\n", 795 cdb[0]); 796 return -EINVAL; 797 } 798 cmd->se_cmd_flags |= SCF_FUA; 799 } 800 return 0; 801 } 802 803 sense_reason_t 804 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 805 { 806 struct se_device *dev = cmd->se_dev; 807 unsigned char *cdb = cmd->t_task_cdb; 808 unsigned int size; 809 u32 sectors = 0; 810 sense_reason_t ret; 811 812 cmd->protocol_data = ops; 813 814 switch (cdb[0]) { 815 case READ_6: 816 sectors = transport_get_sectors_6(cdb); 817 cmd->t_task_lba = transport_lba_21(cdb); 818 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 819 cmd->execute_cmd = sbc_execute_rw; 820 break; 821 case READ_10: 822 sectors = transport_get_sectors_10(cdb); 823 cmd->t_task_lba = transport_lba_32(cdb); 824 825 if (sbc_check_dpofua(dev, cmd, cdb)) 826 return TCM_INVALID_CDB_FIELD; 827 828 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 829 if (ret) 830 return ret; 831 832 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 833 cmd->execute_cmd = sbc_execute_rw; 834 break; 835 case READ_12: 836 sectors = transport_get_sectors_12(cdb); 837 cmd->t_task_lba = transport_lba_32(cdb); 838 839 if (sbc_check_dpofua(dev, cmd, cdb)) 840 return TCM_INVALID_CDB_FIELD; 841 842 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 843 if (ret) 844 return ret; 845 846 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 847 cmd->execute_cmd = sbc_execute_rw; 848 break; 849 case READ_16: 850 sectors = transport_get_sectors_16(cdb); 851 cmd->t_task_lba = transport_lba_64(cdb); 852 853 if (sbc_check_dpofua(dev, cmd, cdb)) 854 return TCM_INVALID_CDB_FIELD; 855 856 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 857 if (ret) 858 return ret; 859 860 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 861 cmd->execute_cmd = sbc_execute_rw; 862 break; 863 case WRITE_6: 864 sectors = transport_get_sectors_6(cdb); 865 cmd->t_task_lba = transport_lba_21(cdb); 866 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 867 cmd->execute_cmd = sbc_execute_rw; 868 break; 869 case WRITE_10: 870 case WRITE_VERIFY: 871 sectors = transport_get_sectors_10(cdb); 872 cmd->t_task_lba = transport_lba_32(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, sectors, true); 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_12: 885 sectors = transport_get_sectors_12(cdb); 886 cmd->t_task_lba = transport_lba_32(cdb); 887 888 if (sbc_check_dpofua(dev, cmd, cdb)) 889 return TCM_INVALID_CDB_FIELD; 890 891 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 892 if (ret) 893 return ret; 894 895 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 896 cmd->execute_cmd = sbc_execute_rw; 897 break; 898 case WRITE_16: 899 case WRITE_VERIFY_16: 900 sectors = transport_get_sectors_16(cdb); 901 cmd->t_task_lba = transport_lba_64(cdb); 902 903 if (sbc_check_dpofua(dev, cmd, cdb)) 904 return TCM_INVALID_CDB_FIELD; 905 906 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 907 if (ret) 908 return ret; 909 910 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 911 cmd->execute_cmd = sbc_execute_rw; 912 break; 913 case XDWRITEREAD_10: 914 if (cmd->data_direction != DMA_TO_DEVICE || 915 !(cmd->se_cmd_flags & SCF_BIDI)) 916 return TCM_INVALID_CDB_FIELD; 917 sectors = transport_get_sectors_10(cdb); 918 919 if (sbc_check_dpofua(dev, cmd, cdb)) 920 return TCM_INVALID_CDB_FIELD; 921 922 cmd->t_task_lba = transport_lba_32(cdb); 923 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 924 925 /* 926 * Setup BIDI XOR callback to be run after I/O completion. 927 */ 928 cmd->execute_cmd = sbc_execute_rw; 929 cmd->transport_complete_callback = &xdreadwrite_callback; 930 break; 931 case VARIABLE_LENGTH_CMD: 932 { 933 u16 service_action = get_unaligned_be16(&cdb[8]); 934 switch (service_action) { 935 case XDWRITEREAD_32: 936 sectors = transport_get_sectors_32(cdb); 937 938 if (sbc_check_dpofua(dev, cmd, cdb)) 939 return TCM_INVALID_CDB_FIELD; 940 /* 941 * Use WRITE_32 and READ_32 opcodes for the emulated 942 * XDWRITE_READ_32 logic. 943 */ 944 cmd->t_task_lba = transport_lba_64_ext(cdb); 945 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 946 947 /* 948 * Setup BIDI XOR callback to be run during after I/O 949 * completion. 950 */ 951 cmd->execute_cmd = sbc_execute_rw; 952 cmd->transport_complete_callback = &xdreadwrite_callback; 953 break; 954 case WRITE_SAME_32: 955 sectors = transport_get_sectors_32(cdb); 956 if (!sectors) { 957 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 958 " supported\n"); 959 return TCM_INVALID_CDB_FIELD; 960 } 961 962 size = sbc_get_size(cmd, 1); 963 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 964 965 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 966 if (ret) 967 return ret; 968 break; 969 default: 970 pr_err("VARIABLE_LENGTH_CMD service action" 971 " 0x%04x not supported\n", service_action); 972 return TCM_UNSUPPORTED_SCSI_OPCODE; 973 } 974 break; 975 } 976 case COMPARE_AND_WRITE: 977 if (!dev->dev_attrib.emulate_caw) { 978 pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject COMPARE_AND_WRITE\n", 979 dev->se_hba->backend->ops->name, 980 config_item_name(&dev->dev_group.cg_item), 981 dev->t10_wwn.unit_serial); 982 return TCM_UNSUPPORTED_SCSI_OPCODE; 983 } 984 sectors = cdb[13]; 985 /* 986 * Currently enforce COMPARE_AND_WRITE for a single sector 987 */ 988 if (sectors > 1) { 989 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 990 " than 1\n", sectors); 991 return TCM_INVALID_CDB_FIELD; 992 } 993 if (sbc_check_dpofua(dev, cmd, cdb)) 994 return TCM_INVALID_CDB_FIELD; 995 996 /* 997 * Double size because we have two buffers, note that 998 * zero is not an error.. 999 */ 1000 size = 2 * sbc_get_size(cmd, sectors); 1001 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1002 cmd->t_task_nolb = sectors; 1003 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 1004 cmd->execute_cmd = sbc_compare_and_write; 1005 cmd->transport_complete_callback = compare_and_write_callback; 1006 break; 1007 case READ_CAPACITY: 1008 size = READ_CAP_LEN; 1009 cmd->execute_cmd = sbc_emulate_readcapacity; 1010 break; 1011 case SERVICE_ACTION_IN_16: 1012 switch (cmd->t_task_cdb[1] & 0x1f) { 1013 case SAI_READ_CAPACITY_16: 1014 cmd->execute_cmd = sbc_emulate_readcapacity_16; 1015 break; 1016 case SAI_REPORT_REFERRALS: 1017 cmd->execute_cmd = target_emulate_report_referrals; 1018 break; 1019 default: 1020 pr_err("Unsupported SA: 0x%02x\n", 1021 cmd->t_task_cdb[1] & 0x1f); 1022 return TCM_INVALID_CDB_FIELD; 1023 } 1024 size = get_unaligned_be32(&cdb[10]); 1025 break; 1026 case SYNCHRONIZE_CACHE: 1027 case SYNCHRONIZE_CACHE_16: 1028 if (cdb[0] == SYNCHRONIZE_CACHE) { 1029 sectors = transport_get_sectors_10(cdb); 1030 cmd->t_task_lba = transport_lba_32(cdb); 1031 } else { 1032 sectors = transport_get_sectors_16(cdb); 1033 cmd->t_task_lba = transport_lba_64(cdb); 1034 } 1035 if (ops->execute_sync_cache) { 1036 cmd->execute_cmd = ops->execute_sync_cache; 1037 goto check_lba; 1038 } 1039 size = 0; 1040 cmd->execute_cmd = sbc_emulate_noop; 1041 break; 1042 case UNMAP: 1043 if (!ops->execute_unmap) 1044 return TCM_UNSUPPORTED_SCSI_OPCODE; 1045 1046 if (!dev->dev_attrib.emulate_tpu) { 1047 pr_err("Got UNMAP, but backend device has" 1048 " emulate_tpu disabled\n"); 1049 return TCM_UNSUPPORTED_SCSI_OPCODE; 1050 } 1051 size = get_unaligned_be16(&cdb[7]); 1052 cmd->execute_cmd = sbc_execute_unmap; 1053 break; 1054 case WRITE_SAME_16: 1055 sectors = transport_get_sectors_16(cdb); 1056 if (!sectors) { 1057 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1058 return TCM_INVALID_CDB_FIELD; 1059 } 1060 1061 size = sbc_get_size(cmd, 1); 1062 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1063 1064 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1065 if (ret) 1066 return ret; 1067 break; 1068 case WRITE_SAME: 1069 sectors = transport_get_sectors_10(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_be32(&cdb[2]); 1077 1078 /* 1079 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1080 * of byte 1 bit 3 UNMAP instead of original reserved field 1081 */ 1082 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1083 if (ret) 1084 return ret; 1085 break; 1086 case VERIFY: 1087 case VERIFY_16: 1088 size = 0; 1089 if (cdb[0] == VERIFY) { 1090 sectors = transport_get_sectors_10(cdb); 1091 cmd->t_task_lba = transport_lba_32(cdb); 1092 } else { 1093 sectors = transport_get_sectors_16(cdb); 1094 cmd->t_task_lba = transport_lba_64(cdb); 1095 } 1096 cmd->execute_cmd = sbc_emulate_noop; 1097 goto check_lba; 1098 case REZERO_UNIT: 1099 case SEEK_6: 1100 case SEEK_10: 1101 /* 1102 * There are still clients out there which use these old SCSI-2 1103 * commands. This mainly happens when running VMs with legacy 1104 * guest systems, connected via SCSI command pass-through to 1105 * iSCSI targets. Make them happy and return status GOOD. 1106 */ 1107 size = 0; 1108 cmd->execute_cmd = sbc_emulate_noop; 1109 break; 1110 case START_STOP: 1111 size = 0; 1112 cmd->execute_cmd = sbc_emulate_startstop; 1113 break; 1114 default: 1115 ret = spc_parse_cdb(cmd, &size); 1116 if (ret) 1117 return ret; 1118 } 1119 1120 /* reject any command that we don't have a handler for */ 1121 if (!cmd->execute_cmd) 1122 return TCM_UNSUPPORTED_SCSI_OPCODE; 1123 1124 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 1125 unsigned long long end_lba; 1126 check_lba: 1127 end_lba = dev->transport->get_blocks(dev) + 1; 1128 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1129 ((cmd->t_task_lba + sectors) > end_lba)) { 1130 pr_err("cmd exceeds last lba %llu " 1131 "(lba %llu, sectors %u)\n", 1132 end_lba, cmd->t_task_lba, sectors); 1133 return TCM_ADDRESS_OUT_OF_RANGE; 1134 } 1135 1136 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 1137 size = sbc_get_size(cmd, sectors); 1138 } 1139 1140 return target_cmd_size_check(cmd, size); 1141 } 1142 EXPORT_SYMBOL(sbc_parse_cdb); 1143 1144 u32 sbc_get_device_type(struct se_device *dev) 1145 { 1146 return TYPE_DISK; 1147 } 1148 EXPORT_SYMBOL(sbc_get_device_type); 1149 1150 static sense_reason_t 1151 sbc_execute_unmap(struct se_cmd *cmd) 1152 { 1153 struct sbc_ops *ops = cmd->protocol_data; 1154 struct se_device *dev = cmd->se_dev; 1155 unsigned char *buf, *ptr = NULL; 1156 sector_t lba; 1157 int size; 1158 u32 range; 1159 sense_reason_t ret = 0; 1160 int dl, bd_dl; 1161 1162 /* We never set ANC_SUP */ 1163 if (cmd->t_task_cdb[1]) 1164 return TCM_INVALID_CDB_FIELD; 1165 1166 if (cmd->data_length == 0) { 1167 target_complete_cmd(cmd, SAM_STAT_GOOD); 1168 return 0; 1169 } 1170 1171 if (cmd->data_length < 8) { 1172 pr_warn("UNMAP parameter list length %u too small\n", 1173 cmd->data_length); 1174 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1175 } 1176 1177 buf = transport_kmap_data_sg(cmd); 1178 if (!buf) 1179 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1180 1181 dl = get_unaligned_be16(&buf[0]); 1182 bd_dl = get_unaligned_be16(&buf[2]); 1183 1184 size = cmd->data_length - 8; 1185 if (bd_dl > size) 1186 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1187 cmd->data_length, bd_dl); 1188 else 1189 size = bd_dl; 1190 1191 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1192 ret = TCM_INVALID_PARAMETER_LIST; 1193 goto err; 1194 } 1195 1196 /* First UNMAP block descriptor starts at 8 byte offset */ 1197 ptr = &buf[8]; 1198 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1199 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1200 1201 while (size >= 16) { 1202 lba = get_unaligned_be64(&ptr[0]); 1203 range = get_unaligned_be32(&ptr[8]); 1204 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1205 (unsigned long long)lba, range); 1206 1207 if (range > dev->dev_attrib.max_unmap_lba_count) { 1208 ret = TCM_INVALID_PARAMETER_LIST; 1209 goto err; 1210 } 1211 1212 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1213 ret = TCM_ADDRESS_OUT_OF_RANGE; 1214 goto err; 1215 } 1216 1217 if (range) { 1218 ret = ops->execute_unmap(cmd, lba, range); 1219 if (ret) 1220 goto err; 1221 } 1222 1223 ptr += 16; 1224 size -= 16; 1225 } 1226 1227 err: 1228 transport_kunmap_data_sg(cmd); 1229 if (!ret) 1230 target_complete_cmd(cmd, GOOD); 1231 return ret; 1232 } 1233 1234 void 1235 sbc_dif_generate(struct se_cmd *cmd) 1236 { 1237 struct se_device *dev = cmd->se_dev; 1238 struct t10_pi_tuple *sdt; 1239 struct scatterlist *dsg = cmd->t_data_sg, *psg; 1240 sector_t sector = cmd->t_task_lba; 1241 void *daddr, *paddr; 1242 int i, j, offset = 0; 1243 unsigned int block_size = dev->dev_attrib.block_size; 1244 1245 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1246 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1247 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1248 1249 for (j = 0; j < psg->length; 1250 j += sizeof(*sdt)) { 1251 __u16 crc; 1252 unsigned int avail; 1253 1254 if (offset >= dsg->length) { 1255 offset -= dsg->length; 1256 kunmap_atomic(daddr - dsg->offset); 1257 dsg = sg_next(dsg); 1258 if (!dsg) { 1259 kunmap_atomic(paddr - psg->offset); 1260 return; 1261 } 1262 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1263 } 1264 1265 sdt = paddr + j; 1266 avail = min(block_size, dsg->length - offset); 1267 crc = crc_t10dif(daddr + offset, avail); 1268 if (avail < block_size) { 1269 kunmap_atomic(daddr - dsg->offset); 1270 dsg = sg_next(dsg); 1271 if (!dsg) { 1272 kunmap_atomic(paddr - psg->offset); 1273 return; 1274 } 1275 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1276 offset = block_size - avail; 1277 crc = crc_t10dif_update(crc, daddr, offset); 1278 } else { 1279 offset += block_size; 1280 } 1281 1282 sdt->guard_tag = cpu_to_be16(crc); 1283 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 1284 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 1285 sdt->app_tag = 0; 1286 1287 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 1288 " app_tag: 0x%04x ref_tag: %u\n", 1289 (cmd->data_direction == DMA_TO_DEVICE) ? 1290 "WRITE" : "READ", (unsigned long long)sector, 1291 sdt->guard_tag, sdt->app_tag, 1292 be32_to_cpu(sdt->ref_tag)); 1293 1294 sector++; 1295 } 1296 1297 kunmap_atomic(daddr - dsg->offset); 1298 kunmap_atomic(paddr - psg->offset); 1299 } 1300 } 1301 1302 static sense_reason_t 1303 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, 1304 __u16 crc, sector_t sector, unsigned int ei_lba) 1305 { 1306 __be16 csum; 1307 1308 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1309 goto check_ref; 1310 1311 csum = cpu_to_be16(crc); 1312 1313 if (sdt->guard_tag != csum) { 1314 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1315 " csum 0x%04x\n", (unsigned long long)sector, 1316 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1317 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1318 } 1319 1320 check_ref: 1321 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1322 return 0; 1323 1324 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 1325 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1326 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1327 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1328 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1329 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1330 } 1331 1332 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 1333 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1334 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1335 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1336 be32_to_cpu(sdt->ref_tag), ei_lba); 1337 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1338 } 1339 1340 return 0; 1341 } 1342 1343 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1344 struct scatterlist *sg, int sg_off) 1345 { 1346 struct se_device *dev = cmd->se_dev; 1347 struct scatterlist *psg; 1348 void *paddr, *addr; 1349 unsigned int i, len, left; 1350 unsigned int offset = sg_off; 1351 1352 if (!sg) 1353 return; 1354 1355 left = sectors * dev->prot_length; 1356 1357 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1358 unsigned int psg_len, copied = 0; 1359 1360 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1361 psg_len = min(left, psg->length); 1362 while (psg_len) { 1363 len = min(psg_len, sg->length - offset); 1364 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1365 1366 if (read) 1367 memcpy(paddr + copied, addr, len); 1368 else 1369 memcpy(addr, paddr + copied, len); 1370 1371 left -= len; 1372 offset += len; 1373 copied += len; 1374 psg_len -= len; 1375 1376 kunmap_atomic(addr - sg->offset - offset); 1377 1378 if (offset >= sg->length) { 1379 sg = sg_next(sg); 1380 offset = 0; 1381 } 1382 } 1383 kunmap_atomic(paddr - psg->offset); 1384 } 1385 } 1386 EXPORT_SYMBOL(sbc_dif_copy_prot); 1387 1388 sense_reason_t 1389 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1390 unsigned int ei_lba, struct scatterlist *psg, int psg_off) 1391 { 1392 struct se_device *dev = cmd->se_dev; 1393 struct t10_pi_tuple *sdt; 1394 struct scatterlist *dsg = cmd->t_data_sg; 1395 sector_t sector = start; 1396 void *daddr, *paddr; 1397 int i; 1398 sense_reason_t rc; 1399 int dsg_off = 0; 1400 unsigned int block_size = dev->dev_attrib.block_size; 1401 1402 for (; psg && sector < start + sectors; psg = sg_next(psg)) { 1403 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1404 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1405 1406 for (i = psg_off; i < psg->length && 1407 sector < start + sectors; 1408 i += sizeof(*sdt)) { 1409 __u16 crc; 1410 unsigned int avail; 1411 1412 if (dsg_off >= dsg->length) { 1413 dsg_off -= dsg->length; 1414 kunmap_atomic(daddr - dsg->offset); 1415 dsg = sg_next(dsg); 1416 if (!dsg) { 1417 kunmap_atomic(paddr - psg->offset); 1418 return 0; 1419 } 1420 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1421 } 1422 1423 sdt = paddr + i; 1424 1425 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1426 " app_tag: 0x%04x ref_tag: %u\n", 1427 (unsigned long long)sector, sdt->guard_tag, 1428 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1429 1430 if (sdt->app_tag == T10_PI_APP_ESCAPE) { 1431 dsg_off += block_size; 1432 goto next; 1433 } 1434 1435 avail = min(block_size, dsg->length - dsg_off); 1436 crc = crc_t10dif(daddr + dsg_off, avail); 1437 if (avail < block_size) { 1438 kunmap_atomic(daddr - dsg->offset); 1439 dsg = sg_next(dsg); 1440 if (!dsg) { 1441 kunmap_atomic(paddr - psg->offset); 1442 return 0; 1443 } 1444 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1445 dsg_off = block_size - avail; 1446 crc = crc_t10dif_update(crc, daddr, dsg_off); 1447 } else { 1448 dsg_off += block_size; 1449 } 1450 1451 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 1452 if (rc) { 1453 kunmap_atomic(daddr - dsg->offset); 1454 kunmap_atomic(paddr - psg->offset); 1455 cmd->bad_sector = sector; 1456 return rc; 1457 } 1458 next: 1459 sector++; 1460 ei_lba++; 1461 } 1462 1463 psg_off = 0; 1464 kunmap_atomic(daddr - dsg->offset); 1465 kunmap_atomic(paddr - psg->offset); 1466 } 1467 1468 return 0; 1469 } 1470 EXPORT_SYMBOL(sbc_dif_verify); 1471