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.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_emulate_readcapacity(struct se_cmd *cmd) 41 { 42 struct se_device *dev = cmd->se_dev; 43 unsigned char *cdb = cmd->t_task_cdb; 44 unsigned long long blocks_long = dev->transport->get_blocks(dev); 45 unsigned char *rbuf; 46 unsigned char buf[8]; 47 u32 blocks; 48 49 /* 50 * SBC-2 says: 51 * If the PMI bit is set to zero and the LOGICAL BLOCK 52 * ADDRESS field is not set to zero, the device server shall 53 * terminate the command with CHECK CONDITION status with 54 * the sense key set to ILLEGAL REQUEST and the additional 55 * sense code set to INVALID FIELD IN CDB. 56 * 57 * In SBC-3, these fields are obsolete, but some SCSI 58 * compliance tests actually check this, so we might as well 59 * follow SBC-2. 60 */ 61 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 62 return TCM_INVALID_CDB_FIELD; 63 64 if (blocks_long >= 0x00000000ffffffff) 65 blocks = 0xffffffff; 66 else 67 blocks = (u32)blocks_long; 68 69 buf[0] = (blocks >> 24) & 0xff; 70 buf[1] = (blocks >> 16) & 0xff; 71 buf[2] = (blocks >> 8) & 0xff; 72 buf[3] = blocks & 0xff; 73 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; 74 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; 75 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; 76 buf[7] = dev->dev_attrib.block_size & 0xff; 77 78 rbuf = transport_kmap_data_sg(cmd); 79 if (rbuf) { 80 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 81 transport_kunmap_data_sg(cmd); 82 } 83 84 target_complete_cmd(cmd, GOOD); 85 return 0; 86 } 87 88 static sense_reason_t 89 sbc_emulate_readcapacity_16(struct se_cmd *cmd) 90 { 91 struct se_device *dev = cmd->se_dev; 92 unsigned char *rbuf; 93 unsigned char buf[32]; 94 unsigned long long blocks = dev->transport->get_blocks(dev); 95 96 memset(buf, 0, sizeof(buf)); 97 buf[0] = (blocks >> 56) & 0xff; 98 buf[1] = (blocks >> 48) & 0xff; 99 buf[2] = (blocks >> 40) & 0xff; 100 buf[3] = (blocks >> 32) & 0xff; 101 buf[4] = (blocks >> 24) & 0xff; 102 buf[5] = (blocks >> 16) & 0xff; 103 buf[6] = (blocks >> 8) & 0xff; 104 buf[7] = blocks & 0xff; 105 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 106 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 107 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 108 buf[11] = dev->dev_attrib.block_size & 0xff; 109 /* 110 * Set P_TYPE and PROT_EN bits for DIF support 111 */ 112 if (dev->dev_attrib.pi_prot_type) 113 buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1; 114 115 if (dev->transport->get_lbppbe) 116 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 117 118 if (dev->transport->get_alignment_offset_lbas) { 119 u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 120 buf[14] = (lalba >> 8) & 0x3f; 121 buf[15] = lalba & 0xff; 122 } 123 124 /* 125 * Set Thin Provisioning Enable bit following sbc3r22 in section 126 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 127 */ 128 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 129 buf[14] |= 0x80; 130 131 rbuf = transport_kmap_data_sg(cmd); 132 if (rbuf) { 133 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 134 transport_kunmap_data_sg(cmd); 135 } 136 137 target_complete_cmd(cmd, GOOD); 138 return 0; 139 } 140 141 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 142 { 143 u32 num_blocks; 144 145 if (cmd->t_task_cdb[0] == WRITE_SAME) 146 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 147 else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 148 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 149 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 150 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 151 152 /* 153 * Use the explicit range when non zero is supplied, otherwise calculate 154 * the remaining range based on ->get_blocks() - starting LBA. 155 */ 156 if (num_blocks) 157 return num_blocks; 158 159 return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 160 cmd->t_task_lba + 1; 161 } 162 EXPORT_SYMBOL(sbc_get_write_same_sectors); 163 164 static sense_reason_t 165 sbc_emulate_noop(struct se_cmd *cmd) 166 { 167 target_complete_cmd(cmd, GOOD); 168 return 0; 169 } 170 171 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 172 { 173 return cmd->se_dev->dev_attrib.block_size * sectors; 174 } 175 176 static int sbc_check_valid_sectors(struct se_cmd *cmd) 177 { 178 struct se_device *dev = cmd->se_dev; 179 unsigned long long end_lba; 180 u32 sectors; 181 182 sectors = cmd->data_length / dev->dev_attrib.block_size; 183 end_lba = dev->transport->get_blocks(dev) + 1; 184 185 if (cmd->t_task_lba + sectors > end_lba) { 186 pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", 187 cmd->t_task_lba, sectors, end_lba); 188 return -EINVAL; 189 } 190 191 return 0; 192 } 193 194 static inline u32 transport_get_sectors_6(unsigned char *cdb) 195 { 196 /* 197 * Use 8-bit sector value. SBC-3 says: 198 * 199 * A TRANSFER LENGTH field set to zero specifies that 256 200 * logical blocks shall be written. Any other value 201 * specifies the number of logical blocks that shall be 202 * written. 203 */ 204 return cdb[4] ? : 256; 205 } 206 207 static inline u32 transport_get_sectors_10(unsigned char *cdb) 208 { 209 return (u32)(cdb[7] << 8) + cdb[8]; 210 } 211 212 static inline u32 transport_get_sectors_12(unsigned char *cdb) 213 { 214 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 215 } 216 217 static inline u32 transport_get_sectors_16(unsigned char *cdb) 218 { 219 return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 220 (cdb[12] << 8) + cdb[13]; 221 } 222 223 /* 224 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 225 */ 226 static inline u32 transport_get_sectors_32(unsigned char *cdb) 227 { 228 return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 229 (cdb[30] << 8) + cdb[31]; 230 231 } 232 233 static inline u32 transport_lba_21(unsigned char *cdb) 234 { 235 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 236 } 237 238 static inline u32 transport_lba_32(unsigned char *cdb) 239 { 240 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 241 } 242 243 static inline unsigned long long transport_lba_64(unsigned char *cdb) 244 { 245 unsigned int __v1, __v2; 246 247 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 248 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 249 250 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 251 } 252 253 /* 254 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 255 */ 256 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 257 { 258 unsigned int __v1, __v2; 259 260 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 261 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 262 263 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 264 } 265 266 static sense_reason_t 267 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 268 { 269 unsigned int sectors = sbc_get_write_same_sectors(cmd); 270 271 if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 272 pr_err("WRITE_SAME PBDATA and LBDATA" 273 " bits not supported for Block Discard" 274 " Emulation\n"); 275 return TCM_UNSUPPORTED_SCSI_OPCODE; 276 } 277 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 278 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 279 sectors, cmd->se_dev->dev_attrib.max_write_same_len); 280 return TCM_INVALID_CDB_FIELD; 281 } 282 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 283 if (flags[0] & 0x10) { 284 pr_warn("WRITE SAME with ANCHOR not supported\n"); 285 return TCM_INVALID_CDB_FIELD; 286 } 287 /* 288 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 289 * translated into block discard requests within backend code. 290 */ 291 if (flags[0] & 0x08) { 292 if (!ops->execute_write_same_unmap) 293 return TCM_UNSUPPORTED_SCSI_OPCODE; 294 295 cmd->execute_cmd = ops->execute_write_same_unmap; 296 return 0; 297 } 298 if (!ops->execute_write_same) 299 return TCM_UNSUPPORTED_SCSI_OPCODE; 300 301 cmd->execute_cmd = ops->execute_write_same; 302 return 0; 303 } 304 305 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) 306 { 307 unsigned char *buf, *addr; 308 struct scatterlist *sg; 309 unsigned int offset; 310 sense_reason_t ret = TCM_NO_SENSE; 311 int i, count; 312 /* 313 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 314 * 315 * 1) read the specified logical block(s); 316 * 2) transfer logical blocks from the data-out buffer; 317 * 3) XOR the logical blocks transferred from the data-out buffer with 318 * the logical blocks read, storing the resulting XOR data in a buffer; 319 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 320 * blocks transferred from the data-out buffer; and 321 * 5) transfer the resulting XOR data to the data-in buffer. 322 */ 323 buf = kmalloc(cmd->data_length, GFP_KERNEL); 324 if (!buf) { 325 pr_err("Unable to allocate xor_callback buf\n"); 326 return TCM_OUT_OF_RESOURCES; 327 } 328 /* 329 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 330 * into the locally allocated *buf 331 */ 332 sg_copy_to_buffer(cmd->t_data_sg, 333 cmd->t_data_nents, 334 buf, 335 cmd->data_length); 336 337 /* 338 * Now perform the XOR against the BIDI read memory located at 339 * cmd->t_mem_bidi_list 340 */ 341 342 offset = 0; 343 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 344 addr = kmap_atomic(sg_page(sg)); 345 if (!addr) { 346 ret = TCM_OUT_OF_RESOURCES; 347 goto out; 348 } 349 350 for (i = 0; i < sg->length; i++) 351 *(addr + sg->offset + i) ^= *(buf + offset + i); 352 353 offset += sg->length; 354 kunmap_atomic(addr); 355 } 356 357 out: 358 kfree(buf); 359 return ret; 360 } 361 362 static sense_reason_t 363 sbc_execute_rw(struct se_cmd *cmd) 364 { 365 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 366 cmd->data_direction); 367 } 368 369 static sense_reason_t compare_and_write_post(struct se_cmd *cmd) 370 { 371 struct se_device *dev = cmd->se_dev; 372 373 /* 374 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 375 * within target_complete_ok_work() if the command was successfully 376 * sent to the backend driver. 377 */ 378 spin_lock_irq(&cmd->t_state_lock); 379 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 380 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 381 spin_unlock_irq(&cmd->t_state_lock); 382 383 /* 384 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 385 * before the original READ I/O submission. 386 */ 387 up(&dev->caw_sem); 388 389 return TCM_NO_SENSE; 390 } 391 392 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) 393 { 394 struct se_device *dev = cmd->se_dev; 395 struct scatterlist *write_sg = NULL, *sg; 396 unsigned char *buf = NULL, *addr; 397 struct sg_mapping_iter m; 398 unsigned int offset = 0, len; 399 unsigned int nlbas = cmd->t_task_nolb; 400 unsigned int block_size = dev->dev_attrib.block_size; 401 unsigned int compare_len = (nlbas * block_size); 402 sense_reason_t ret = TCM_NO_SENSE; 403 int rc, i; 404 405 /* 406 * Handle early failure in transport_generic_request_failure(), 407 * which will not have taken ->caw_mutex yet.. 408 */ 409 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) 410 return TCM_NO_SENSE; 411 /* 412 * Immediately exit + release dev->caw_sem if command has already 413 * been failed with a non-zero SCSI status. 414 */ 415 if (cmd->scsi_status) { 416 pr_err("compare_and_write_callback: non zero scsi_status:" 417 " 0x%02x\n", cmd->scsi_status); 418 goto out; 419 } 420 421 buf = kzalloc(cmd->data_length, GFP_KERNEL); 422 if (!buf) { 423 pr_err("Unable to allocate compare_and_write buf\n"); 424 ret = TCM_OUT_OF_RESOURCES; 425 goto out; 426 } 427 428 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 429 GFP_KERNEL); 430 if (!write_sg) { 431 pr_err("Unable to allocate compare_and_write sg\n"); 432 ret = TCM_OUT_OF_RESOURCES; 433 goto out; 434 } 435 sg_init_table(write_sg, cmd->t_data_nents); 436 /* 437 * Setup verify and write data payloads from total NumberLBAs. 438 */ 439 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 440 cmd->data_length); 441 if (!rc) { 442 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 443 ret = TCM_OUT_OF_RESOURCES; 444 goto out; 445 } 446 /* 447 * Compare against SCSI READ payload against verify payload 448 */ 449 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 450 addr = (unsigned char *)kmap_atomic(sg_page(sg)); 451 if (!addr) { 452 ret = TCM_OUT_OF_RESOURCES; 453 goto out; 454 } 455 456 len = min(sg->length, compare_len); 457 458 if (memcmp(addr, buf + offset, len)) { 459 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 460 addr, buf + offset); 461 kunmap_atomic(addr); 462 goto miscompare; 463 } 464 kunmap_atomic(addr); 465 466 offset += len; 467 compare_len -= len; 468 if (!compare_len) 469 break; 470 } 471 472 i = 0; 473 len = cmd->t_task_nolb * block_size; 474 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 475 /* 476 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 477 */ 478 while (len) { 479 sg_miter_next(&m); 480 481 if (block_size < PAGE_SIZE) { 482 sg_set_page(&write_sg[i], m.page, block_size, 483 block_size); 484 } else { 485 sg_miter_next(&m); 486 sg_set_page(&write_sg[i], m.page, block_size, 487 0); 488 } 489 len -= block_size; 490 i++; 491 } 492 sg_miter_stop(&m); 493 /* 494 * Save the original SGL + nents values before updating to new 495 * assignments, to be released in transport_free_pages() -> 496 * transport_reset_sgl_orig() 497 */ 498 cmd->t_data_sg_orig = cmd->t_data_sg; 499 cmd->t_data_sg = write_sg; 500 cmd->t_data_nents_orig = cmd->t_data_nents; 501 cmd->t_data_nents = 1; 502 503 cmd->sam_task_attr = MSG_HEAD_TAG; 504 cmd->transport_complete_callback = compare_and_write_post; 505 /* 506 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 507 * for submitting the adjusted SGL to write instance user-data. 508 */ 509 cmd->execute_cmd = sbc_execute_rw; 510 511 spin_lock_irq(&cmd->t_state_lock); 512 cmd->t_state = TRANSPORT_PROCESSING; 513 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 514 spin_unlock_irq(&cmd->t_state_lock); 515 516 __target_execute_cmd(cmd); 517 518 kfree(buf); 519 return ret; 520 521 miscompare: 522 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 523 dev->transport->name); 524 ret = TCM_MISCOMPARE_VERIFY; 525 out: 526 /* 527 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 528 * sbc_compare_and_write() before the original READ I/O submission. 529 */ 530 up(&dev->caw_sem); 531 kfree(write_sg); 532 kfree(buf); 533 return ret; 534 } 535 536 static sense_reason_t 537 sbc_compare_and_write(struct se_cmd *cmd) 538 { 539 struct se_device *dev = cmd->se_dev; 540 sense_reason_t ret; 541 int rc; 542 /* 543 * Submit the READ first for COMPARE_AND_WRITE to perform the 544 * comparision using SGLs at cmd->t_bidi_data_sg.. 545 */ 546 rc = down_interruptible(&dev->caw_sem); 547 if ((rc != 0) || signal_pending(current)) { 548 cmd->transport_complete_callback = NULL; 549 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 550 } 551 /* 552 * Reset cmd->data_length to individual block_size in order to not 553 * confuse backend drivers that depend on this value matching the 554 * size of the I/O being submitted. 555 */ 556 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 557 558 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 559 DMA_FROM_DEVICE); 560 if (ret) { 561 cmd->transport_complete_callback = NULL; 562 up(&dev->caw_sem); 563 return ret; 564 } 565 /* 566 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 567 * upon MISCOMPARE, or in compare_and_write_done() upon completion 568 * of WRITE instance user-data. 569 */ 570 return TCM_NO_SENSE; 571 } 572 573 static int 574 sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type, 575 bool is_write, struct se_cmd *cmd) 576 { 577 if (is_write) { 578 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS : 579 TARGET_PROT_DOUT_INSERT; 580 switch (protect) { 581 case 0x0: 582 case 0x3: 583 cmd->prot_checks = 0; 584 break; 585 case 0x1: 586 case 0x5: 587 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 588 if (prot_type == TARGET_DIF_TYPE1_PROT) 589 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 590 break; 591 case 0x2: 592 if (prot_type == TARGET_DIF_TYPE1_PROT) 593 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 594 break; 595 case 0x4: 596 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 597 break; 598 default: 599 pr_err("Unsupported protect field %d\n", protect); 600 return -EINVAL; 601 } 602 } else { 603 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS : 604 TARGET_PROT_DIN_STRIP; 605 switch (protect) { 606 case 0x0: 607 case 0x1: 608 case 0x5: 609 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 610 if (prot_type == TARGET_DIF_TYPE1_PROT) 611 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 612 break; 613 case 0x2: 614 if (prot_type == TARGET_DIF_TYPE1_PROT) 615 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 616 break; 617 case 0x3: 618 cmd->prot_checks = 0; 619 break; 620 case 0x4: 621 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 622 break; 623 default: 624 pr_err("Unsupported protect field %d\n", protect); 625 return -EINVAL; 626 } 627 } 628 629 return 0; 630 } 631 632 static bool 633 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 634 u32 sectors, bool is_write) 635 { 636 u8 protect = cdb[1] >> 5; 637 638 if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto) 639 return true; 640 641 switch (dev->dev_attrib.pi_prot_type) { 642 case TARGET_DIF_TYPE3_PROT: 643 cmd->reftag_seed = 0xffffffff; 644 break; 645 case TARGET_DIF_TYPE2_PROT: 646 if (protect) 647 return false; 648 649 cmd->reftag_seed = cmd->t_task_lba; 650 break; 651 case TARGET_DIF_TYPE1_PROT: 652 cmd->reftag_seed = cmd->t_task_lba; 653 break; 654 case TARGET_DIF_TYPE0_PROT: 655 default: 656 return true; 657 } 658 659 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type, 660 is_write, cmd)) 661 return false; 662 663 cmd->prot_type = dev->dev_attrib.pi_prot_type; 664 cmd->prot_length = dev->prot_length * sectors; 665 pr_debug("%s: prot_type=%d, prot_length=%d prot_op=%d prot_checks=%d\n", 666 __func__, cmd->prot_type, cmd->prot_length, 667 cmd->prot_op, cmd->prot_checks); 668 669 return true; 670 } 671 672 sense_reason_t 673 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 674 { 675 struct se_device *dev = cmd->se_dev; 676 unsigned char *cdb = cmd->t_task_cdb; 677 unsigned int size; 678 u32 sectors = 0; 679 sense_reason_t ret; 680 681 switch (cdb[0]) { 682 case READ_6: 683 sectors = transport_get_sectors_6(cdb); 684 cmd->t_task_lba = transport_lba_21(cdb); 685 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 686 cmd->execute_rw = ops->execute_rw; 687 cmd->execute_cmd = sbc_execute_rw; 688 break; 689 case READ_10: 690 sectors = transport_get_sectors_10(cdb); 691 cmd->t_task_lba = transport_lba_32(cdb); 692 693 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 694 return TCM_UNSUPPORTED_SCSI_OPCODE; 695 696 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 697 cmd->execute_rw = ops->execute_rw; 698 cmd->execute_cmd = sbc_execute_rw; 699 break; 700 case READ_12: 701 sectors = transport_get_sectors_12(cdb); 702 cmd->t_task_lba = transport_lba_32(cdb); 703 704 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 705 return TCM_UNSUPPORTED_SCSI_OPCODE; 706 707 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 708 cmd->execute_rw = ops->execute_rw; 709 cmd->execute_cmd = sbc_execute_rw; 710 break; 711 case READ_16: 712 sectors = transport_get_sectors_16(cdb); 713 cmd->t_task_lba = transport_lba_64(cdb); 714 715 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 716 return TCM_UNSUPPORTED_SCSI_OPCODE; 717 718 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 719 cmd->execute_rw = ops->execute_rw; 720 cmd->execute_cmd = sbc_execute_rw; 721 break; 722 case WRITE_6: 723 sectors = transport_get_sectors_6(cdb); 724 cmd->t_task_lba = transport_lba_21(cdb); 725 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 726 cmd->execute_rw = ops->execute_rw; 727 cmd->execute_cmd = sbc_execute_rw; 728 break; 729 case WRITE_10: 730 case WRITE_VERIFY: 731 sectors = transport_get_sectors_10(cdb); 732 cmd->t_task_lba = transport_lba_32(cdb); 733 734 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 735 return TCM_UNSUPPORTED_SCSI_OPCODE; 736 737 if (cdb[1] & 0x8) 738 cmd->se_cmd_flags |= SCF_FUA; 739 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 740 cmd->execute_rw = ops->execute_rw; 741 cmd->execute_cmd = sbc_execute_rw; 742 break; 743 case WRITE_12: 744 sectors = transport_get_sectors_12(cdb); 745 cmd->t_task_lba = transport_lba_32(cdb); 746 747 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 748 return TCM_UNSUPPORTED_SCSI_OPCODE; 749 750 if (cdb[1] & 0x8) 751 cmd->se_cmd_flags |= SCF_FUA; 752 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 753 cmd->execute_rw = ops->execute_rw; 754 cmd->execute_cmd = sbc_execute_rw; 755 break; 756 case WRITE_16: 757 sectors = transport_get_sectors_16(cdb); 758 cmd->t_task_lba = transport_lba_64(cdb); 759 760 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 761 return TCM_UNSUPPORTED_SCSI_OPCODE; 762 763 if (cdb[1] & 0x8) 764 cmd->se_cmd_flags |= SCF_FUA; 765 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 766 cmd->execute_rw = ops->execute_rw; 767 cmd->execute_cmd = sbc_execute_rw; 768 break; 769 case XDWRITEREAD_10: 770 if (cmd->data_direction != DMA_TO_DEVICE || 771 !(cmd->se_cmd_flags & SCF_BIDI)) 772 return TCM_INVALID_CDB_FIELD; 773 sectors = transport_get_sectors_10(cdb); 774 775 cmd->t_task_lba = transport_lba_32(cdb); 776 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 777 778 /* 779 * Setup BIDI XOR callback to be run after I/O completion. 780 */ 781 cmd->execute_rw = ops->execute_rw; 782 cmd->execute_cmd = sbc_execute_rw; 783 cmd->transport_complete_callback = &xdreadwrite_callback; 784 if (cdb[1] & 0x8) 785 cmd->se_cmd_flags |= SCF_FUA; 786 break; 787 case VARIABLE_LENGTH_CMD: 788 { 789 u16 service_action = get_unaligned_be16(&cdb[8]); 790 switch (service_action) { 791 case XDWRITEREAD_32: 792 sectors = transport_get_sectors_32(cdb); 793 794 /* 795 * Use WRITE_32 and READ_32 opcodes for the emulated 796 * XDWRITE_READ_32 logic. 797 */ 798 cmd->t_task_lba = transport_lba_64_ext(cdb); 799 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 800 801 /* 802 * Setup BIDI XOR callback to be run during after I/O 803 * completion. 804 */ 805 cmd->execute_rw = ops->execute_rw; 806 cmd->execute_cmd = sbc_execute_rw; 807 cmd->transport_complete_callback = &xdreadwrite_callback; 808 if (cdb[1] & 0x8) 809 cmd->se_cmd_flags |= SCF_FUA; 810 break; 811 case WRITE_SAME_32: 812 sectors = transport_get_sectors_32(cdb); 813 if (!sectors) { 814 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 815 " supported\n"); 816 return TCM_INVALID_CDB_FIELD; 817 } 818 819 size = sbc_get_size(cmd, 1); 820 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 821 822 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 823 if (ret) 824 return ret; 825 break; 826 default: 827 pr_err("VARIABLE_LENGTH_CMD service action" 828 " 0x%04x not supported\n", service_action); 829 return TCM_UNSUPPORTED_SCSI_OPCODE; 830 } 831 break; 832 } 833 case COMPARE_AND_WRITE: 834 sectors = cdb[13]; 835 /* 836 * Currently enforce COMPARE_AND_WRITE for a single sector 837 */ 838 if (sectors > 1) { 839 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 840 " than 1\n", sectors); 841 return TCM_INVALID_CDB_FIELD; 842 } 843 /* 844 * Double size because we have two buffers, note that 845 * zero is not an error.. 846 */ 847 size = 2 * sbc_get_size(cmd, sectors); 848 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 849 cmd->t_task_nolb = sectors; 850 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 851 cmd->execute_rw = ops->execute_rw; 852 cmd->execute_cmd = sbc_compare_and_write; 853 cmd->transport_complete_callback = compare_and_write_callback; 854 break; 855 case READ_CAPACITY: 856 size = READ_CAP_LEN; 857 cmd->execute_cmd = sbc_emulate_readcapacity; 858 break; 859 case SERVICE_ACTION_IN: 860 switch (cmd->t_task_cdb[1] & 0x1f) { 861 case SAI_READ_CAPACITY_16: 862 cmd->execute_cmd = sbc_emulate_readcapacity_16; 863 break; 864 case SAI_REPORT_REFERRALS: 865 cmd->execute_cmd = target_emulate_report_referrals; 866 break; 867 default: 868 pr_err("Unsupported SA: 0x%02x\n", 869 cmd->t_task_cdb[1] & 0x1f); 870 return TCM_INVALID_CDB_FIELD; 871 } 872 size = (cdb[10] << 24) | (cdb[11] << 16) | 873 (cdb[12] << 8) | cdb[13]; 874 break; 875 case SYNCHRONIZE_CACHE: 876 case SYNCHRONIZE_CACHE_16: 877 if (!ops->execute_sync_cache) { 878 size = 0; 879 cmd->execute_cmd = sbc_emulate_noop; 880 break; 881 } 882 883 /* 884 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE 885 */ 886 if (cdb[0] == SYNCHRONIZE_CACHE) { 887 sectors = transport_get_sectors_10(cdb); 888 cmd->t_task_lba = transport_lba_32(cdb); 889 } else { 890 sectors = transport_get_sectors_16(cdb); 891 cmd->t_task_lba = transport_lba_64(cdb); 892 } 893 894 size = sbc_get_size(cmd, sectors); 895 896 /* 897 * Check to ensure that LBA + Range does not exceed past end of 898 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls 899 */ 900 if (cmd->t_task_lba || sectors) { 901 if (sbc_check_valid_sectors(cmd) < 0) 902 return TCM_ADDRESS_OUT_OF_RANGE; 903 } 904 cmd->execute_cmd = ops->execute_sync_cache; 905 break; 906 case UNMAP: 907 if (!ops->execute_unmap) 908 return TCM_UNSUPPORTED_SCSI_OPCODE; 909 910 size = get_unaligned_be16(&cdb[7]); 911 cmd->execute_cmd = ops->execute_unmap; 912 break; 913 case WRITE_SAME_16: 914 sectors = transport_get_sectors_16(cdb); 915 if (!sectors) { 916 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 917 return TCM_INVALID_CDB_FIELD; 918 } 919 920 size = sbc_get_size(cmd, 1); 921 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 922 923 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 924 if (ret) 925 return ret; 926 break; 927 case WRITE_SAME: 928 sectors = transport_get_sectors_10(cdb); 929 if (!sectors) { 930 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 931 return TCM_INVALID_CDB_FIELD; 932 } 933 934 size = sbc_get_size(cmd, 1); 935 cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 936 937 /* 938 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 939 * of byte 1 bit 3 UNMAP instead of original reserved field 940 */ 941 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 942 if (ret) 943 return ret; 944 break; 945 case VERIFY: 946 size = 0; 947 cmd->execute_cmd = sbc_emulate_noop; 948 break; 949 case REZERO_UNIT: 950 case SEEK_6: 951 case SEEK_10: 952 /* 953 * There are still clients out there which use these old SCSI-2 954 * commands. This mainly happens when running VMs with legacy 955 * guest systems, connected via SCSI command pass-through to 956 * iSCSI targets. Make them happy and return status GOOD. 957 */ 958 size = 0; 959 cmd->execute_cmd = sbc_emulate_noop; 960 break; 961 default: 962 ret = spc_parse_cdb(cmd, &size); 963 if (ret) 964 return ret; 965 } 966 967 /* reject any command that we don't have a handler for */ 968 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) 969 return TCM_UNSUPPORTED_SCSI_OPCODE; 970 971 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 972 unsigned long long end_lba; 973 974 if (sectors > dev->dev_attrib.fabric_max_sectors) { 975 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 976 " big sectors %u exceeds fabric_max_sectors:" 977 " %u\n", cdb[0], sectors, 978 dev->dev_attrib.fabric_max_sectors); 979 return TCM_INVALID_CDB_FIELD; 980 } 981 if (sectors > dev->dev_attrib.hw_max_sectors) { 982 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 983 " big sectors %u exceeds backend hw_max_sectors:" 984 " %u\n", cdb[0], sectors, 985 dev->dev_attrib.hw_max_sectors); 986 return TCM_INVALID_CDB_FIELD; 987 } 988 989 end_lba = dev->transport->get_blocks(dev) + 1; 990 if (cmd->t_task_lba + sectors > end_lba) { 991 pr_err("cmd exceeds last lba %llu " 992 "(lba %llu, sectors %u)\n", 993 end_lba, cmd->t_task_lba, sectors); 994 return TCM_ADDRESS_OUT_OF_RANGE; 995 } 996 997 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 998 size = sbc_get_size(cmd, sectors); 999 } 1000 1001 return target_cmd_size_check(cmd, size); 1002 } 1003 EXPORT_SYMBOL(sbc_parse_cdb); 1004 1005 u32 sbc_get_device_type(struct se_device *dev) 1006 { 1007 return TYPE_DISK; 1008 } 1009 EXPORT_SYMBOL(sbc_get_device_type); 1010 1011 sense_reason_t 1012 sbc_execute_unmap(struct se_cmd *cmd, 1013 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, 1014 sector_t, sector_t), 1015 void *priv) 1016 { 1017 struct se_device *dev = cmd->se_dev; 1018 unsigned char *buf, *ptr = NULL; 1019 sector_t lba; 1020 int size; 1021 u32 range; 1022 sense_reason_t ret = 0; 1023 int dl, bd_dl; 1024 1025 /* We never set ANC_SUP */ 1026 if (cmd->t_task_cdb[1]) 1027 return TCM_INVALID_CDB_FIELD; 1028 1029 if (cmd->data_length == 0) { 1030 target_complete_cmd(cmd, SAM_STAT_GOOD); 1031 return 0; 1032 } 1033 1034 if (cmd->data_length < 8) { 1035 pr_warn("UNMAP parameter list length %u too small\n", 1036 cmd->data_length); 1037 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1038 } 1039 1040 buf = transport_kmap_data_sg(cmd); 1041 if (!buf) 1042 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1043 1044 dl = get_unaligned_be16(&buf[0]); 1045 bd_dl = get_unaligned_be16(&buf[2]); 1046 1047 size = cmd->data_length - 8; 1048 if (bd_dl > size) 1049 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1050 cmd->data_length, bd_dl); 1051 else 1052 size = bd_dl; 1053 1054 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1055 ret = TCM_INVALID_PARAMETER_LIST; 1056 goto err; 1057 } 1058 1059 /* First UNMAP block descriptor starts at 8 byte offset */ 1060 ptr = &buf[8]; 1061 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1062 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1063 1064 while (size >= 16) { 1065 lba = get_unaligned_be64(&ptr[0]); 1066 range = get_unaligned_be32(&ptr[8]); 1067 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1068 (unsigned long long)lba, range); 1069 1070 if (range > dev->dev_attrib.max_unmap_lba_count) { 1071 ret = TCM_INVALID_PARAMETER_LIST; 1072 goto err; 1073 } 1074 1075 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1076 ret = TCM_ADDRESS_OUT_OF_RANGE; 1077 goto err; 1078 } 1079 1080 ret = do_unmap_fn(cmd, priv, lba, range); 1081 if (ret) 1082 goto err; 1083 1084 ptr += 16; 1085 size -= 16; 1086 } 1087 1088 err: 1089 transport_kunmap_data_sg(cmd); 1090 if (!ret) 1091 target_complete_cmd(cmd, GOOD); 1092 return ret; 1093 } 1094 EXPORT_SYMBOL(sbc_execute_unmap); 1095 1096 static sense_reason_t 1097 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, 1098 const void *p, sector_t sector, unsigned int ei_lba) 1099 { 1100 int block_size = dev->dev_attrib.block_size; 1101 __be16 csum; 1102 1103 csum = cpu_to_be16(crc_t10dif(p, block_size)); 1104 1105 if (sdt->guard_tag != csum) { 1106 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1107 " csum 0x%04x\n", (unsigned long long)sector, 1108 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1109 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1110 } 1111 1112 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && 1113 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1114 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1115 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1116 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1117 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1118 } 1119 1120 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && 1121 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1122 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1123 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1124 be32_to_cpu(sdt->ref_tag), ei_lba); 1125 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1126 } 1127 1128 return 0; 1129 } 1130 1131 static void 1132 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1133 struct scatterlist *sg, int sg_off) 1134 { 1135 struct se_device *dev = cmd->se_dev; 1136 struct scatterlist *psg; 1137 void *paddr, *addr; 1138 unsigned int i, len, left; 1139 unsigned int offset = sg_off; 1140 1141 left = sectors * dev->prot_length; 1142 1143 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1144 unsigned int psg_len, copied = 0; 1145 1146 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1147 psg_len = min(left, psg->length); 1148 while (psg_len) { 1149 len = min(psg_len, sg->length - offset); 1150 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1151 1152 if (read) 1153 memcpy(paddr + copied, addr, len); 1154 else 1155 memcpy(addr, paddr + copied, len); 1156 1157 left -= len; 1158 offset += len; 1159 copied += len; 1160 psg_len -= len; 1161 1162 if (offset >= sg->length) { 1163 sg = sg_next(sg); 1164 offset = 0; 1165 } 1166 kunmap_atomic(addr); 1167 } 1168 kunmap_atomic(paddr); 1169 } 1170 } 1171 1172 sense_reason_t 1173 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1174 unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1175 { 1176 struct se_device *dev = cmd->se_dev; 1177 struct se_dif_v1_tuple *sdt; 1178 struct scatterlist *dsg, *psg = cmd->t_prot_sg; 1179 sector_t sector = start; 1180 void *daddr, *paddr; 1181 int i, j, offset = 0; 1182 sense_reason_t rc; 1183 1184 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1185 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1186 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1187 1188 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1189 1190 if (offset >= psg->length) { 1191 kunmap_atomic(paddr); 1192 psg = sg_next(psg); 1193 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1194 offset = 0; 1195 } 1196 1197 sdt = paddr + offset; 1198 1199 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" 1200 " app_tag: 0x%04x ref_tag: %u\n", 1201 (unsigned long long)sector, sdt->guard_tag, 1202 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1203 1204 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 1205 ei_lba); 1206 if (rc) { 1207 kunmap_atomic(paddr); 1208 kunmap_atomic(daddr); 1209 cmd->bad_sector = sector; 1210 return rc; 1211 } 1212 1213 sector++; 1214 ei_lba++; 1215 offset += sizeof(struct se_dif_v1_tuple); 1216 } 1217 1218 kunmap_atomic(paddr); 1219 kunmap_atomic(daddr); 1220 } 1221 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); 1222 1223 return 0; 1224 } 1225 EXPORT_SYMBOL(sbc_dif_verify_write); 1226 1227 sense_reason_t 1228 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1229 unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1230 { 1231 struct se_device *dev = cmd->se_dev; 1232 struct se_dif_v1_tuple *sdt; 1233 struct scatterlist *dsg, *psg = sg; 1234 sector_t sector = start; 1235 void *daddr, *paddr; 1236 int i, j, offset = sg_off; 1237 sense_reason_t rc; 1238 1239 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1240 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1241 paddr = kmap_atomic(sg_page(psg)) + sg->offset; 1242 1243 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1244 1245 if (offset >= psg->length) { 1246 kunmap_atomic(paddr); 1247 psg = sg_next(psg); 1248 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1249 offset = 0; 1250 } 1251 1252 sdt = paddr + offset; 1253 1254 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1255 " app_tag: 0x%04x ref_tag: %u\n", 1256 (unsigned long long)sector, sdt->guard_tag, 1257 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1258 1259 if (sdt->app_tag == cpu_to_be16(0xffff)) { 1260 sector++; 1261 offset += sizeof(struct se_dif_v1_tuple); 1262 continue; 1263 } 1264 1265 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 1266 ei_lba); 1267 if (rc) { 1268 kunmap_atomic(paddr); 1269 kunmap_atomic(daddr); 1270 cmd->bad_sector = sector; 1271 return rc; 1272 } 1273 1274 sector++; 1275 ei_lba++; 1276 offset += sizeof(struct se_dif_v1_tuple); 1277 } 1278 1279 kunmap_atomic(paddr); 1280 kunmap_atomic(daddr); 1281 } 1282 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); 1283 1284 return 0; 1285 } 1286 EXPORT_SYMBOL(sbc_dif_verify_read); 1287