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 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 365 * 366 * 1) read the specified logical block(s); 367 * 2) transfer logical blocks from the data-out buffer; 368 * 3) XOR the logical blocks transferred from the data-out buffer with 369 * the logical blocks read, storing the resulting XOR data in a buffer; 370 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 371 * blocks transferred from the data-out buffer; and 372 * 5) transfer the resulting XOR data to the data-in buffer. 373 */ 374 buf = kmalloc(cmd->data_length, GFP_KERNEL); 375 if (!buf) { 376 pr_err("Unable to allocate xor_callback buf\n"); 377 return TCM_OUT_OF_RESOURCES; 378 } 379 /* 380 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 381 * into the locally allocated *buf 382 */ 383 sg_copy_to_buffer(cmd->t_data_sg, 384 cmd->t_data_nents, 385 buf, 386 cmd->data_length); 387 388 /* 389 * Now perform the XOR against the BIDI read memory located at 390 * cmd->t_mem_bidi_list 391 */ 392 393 offset = 0; 394 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 395 addr = kmap_atomic(sg_page(sg)); 396 if (!addr) { 397 ret = TCM_OUT_OF_RESOURCES; 398 goto out; 399 } 400 401 for (i = 0; i < sg->length; i++) 402 *(addr + sg->offset + i) ^= *(buf + offset + i); 403 404 offset += sg->length; 405 kunmap_atomic(addr); 406 } 407 408 out: 409 kfree(buf); 410 return ret; 411 } 412 413 static sense_reason_t 414 sbc_execute_rw(struct se_cmd *cmd) 415 { 416 struct sbc_ops *ops = cmd->protocol_data; 417 418 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 419 cmd->data_direction); 420 } 421 422 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, 423 int *post_ret) 424 { 425 struct se_device *dev = cmd->se_dev; 426 sense_reason_t ret = TCM_NO_SENSE; 427 428 /* 429 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 430 * within target_complete_ok_work() if the command was successfully 431 * sent to the backend driver. 432 */ 433 spin_lock_irq(&cmd->t_state_lock); 434 if (cmd->transport_state & CMD_T_SENT) { 435 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 436 *post_ret = 1; 437 438 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 439 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 440 } 441 spin_unlock_irq(&cmd->t_state_lock); 442 443 /* 444 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 445 * before the original READ I/O submission. 446 */ 447 up(&dev->caw_sem); 448 449 return ret; 450 } 451 452 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, 453 int *post_ret) 454 { 455 struct se_device *dev = cmd->se_dev; 456 struct scatterlist *write_sg = NULL, *sg; 457 unsigned char *buf = NULL, *addr; 458 struct sg_mapping_iter m; 459 unsigned int offset = 0, len; 460 unsigned int nlbas = cmd->t_task_nolb; 461 unsigned int block_size = dev->dev_attrib.block_size; 462 unsigned int compare_len = (nlbas * block_size); 463 sense_reason_t ret = TCM_NO_SENSE; 464 int rc, i; 465 466 /* 467 * Handle early failure in transport_generic_request_failure(), 468 * which will not have taken ->caw_sem yet.. 469 */ 470 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 471 return TCM_NO_SENSE; 472 /* 473 * Handle special case for zero-length COMPARE_AND_WRITE 474 */ 475 if (!cmd->data_length) 476 goto out; 477 /* 478 * Immediately exit + release dev->caw_sem if command has already 479 * been failed with a non-zero SCSI status. 480 */ 481 if (cmd->scsi_status) { 482 pr_debug("compare_and_write_callback: non zero scsi_status:" 483 " 0x%02x\n", cmd->scsi_status); 484 *post_ret = 1; 485 if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 486 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 487 goto out; 488 } 489 490 buf = kzalloc(cmd->data_length, GFP_KERNEL); 491 if (!buf) { 492 pr_err("Unable to allocate compare_and_write buf\n"); 493 ret = TCM_OUT_OF_RESOURCES; 494 goto out; 495 } 496 497 write_sg = kmalloc_array(cmd->t_data_nents, sizeof(*write_sg), 498 GFP_KERNEL); 499 if (!write_sg) { 500 pr_err("Unable to allocate compare_and_write sg\n"); 501 ret = TCM_OUT_OF_RESOURCES; 502 goto out; 503 } 504 sg_init_table(write_sg, cmd->t_data_nents); 505 /* 506 * Setup verify and write data payloads from total NumberLBAs. 507 */ 508 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 509 cmd->data_length); 510 if (!rc) { 511 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 512 ret = TCM_OUT_OF_RESOURCES; 513 goto out; 514 } 515 /* 516 * Compare against SCSI READ payload against verify payload 517 */ 518 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 519 addr = (unsigned char *)kmap_atomic(sg_page(sg)); 520 if (!addr) { 521 ret = TCM_OUT_OF_RESOURCES; 522 goto out; 523 } 524 525 len = min(sg->length, compare_len); 526 527 if (memcmp(addr, buf + offset, len)) { 528 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 529 addr, buf + offset); 530 kunmap_atomic(addr); 531 goto miscompare; 532 } 533 kunmap_atomic(addr); 534 535 offset += len; 536 compare_len -= len; 537 if (!compare_len) 538 break; 539 } 540 541 i = 0; 542 len = cmd->t_task_nolb * block_size; 543 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 544 /* 545 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 546 */ 547 while (len) { 548 sg_miter_next(&m); 549 550 if (block_size < PAGE_SIZE) { 551 sg_set_page(&write_sg[i], m.page, block_size, 552 m.piter.sg->offset + block_size); 553 } else { 554 sg_miter_next(&m); 555 sg_set_page(&write_sg[i], m.page, block_size, 556 m.piter.sg->offset); 557 } 558 len -= block_size; 559 i++; 560 } 561 sg_miter_stop(&m); 562 /* 563 * Save the original SGL + nents values before updating to new 564 * assignments, to be released in transport_free_pages() -> 565 * transport_reset_sgl_orig() 566 */ 567 cmd->t_data_sg_orig = cmd->t_data_sg; 568 cmd->t_data_sg = write_sg; 569 cmd->t_data_nents_orig = cmd->t_data_nents; 570 cmd->t_data_nents = 1; 571 572 cmd->sam_task_attr = TCM_HEAD_TAG; 573 cmd->transport_complete_callback = compare_and_write_post; 574 /* 575 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 576 * for submitting the adjusted SGL to write instance user-data. 577 */ 578 cmd->execute_cmd = sbc_execute_rw; 579 580 spin_lock_irq(&cmd->t_state_lock); 581 cmd->t_state = TRANSPORT_PROCESSING; 582 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; 583 spin_unlock_irq(&cmd->t_state_lock); 584 585 __target_execute_cmd(cmd, false); 586 587 kfree(buf); 588 return ret; 589 590 miscompare: 591 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 592 dev->transport->name); 593 ret = TCM_MISCOMPARE_VERIFY; 594 out: 595 /* 596 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 597 * sbc_compare_and_write() before the original READ I/O submission. 598 */ 599 up(&dev->caw_sem); 600 kfree(write_sg); 601 kfree(buf); 602 return ret; 603 } 604 605 static sense_reason_t 606 sbc_compare_and_write(struct se_cmd *cmd) 607 { 608 struct sbc_ops *ops = cmd->protocol_data; 609 struct se_device *dev = cmd->se_dev; 610 sense_reason_t ret; 611 int rc; 612 /* 613 * Submit the READ first for COMPARE_AND_WRITE to perform the 614 * comparision using SGLs at cmd->t_bidi_data_sg.. 615 */ 616 rc = down_interruptible(&dev->caw_sem); 617 if (rc != 0) { 618 cmd->transport_complete_callback = NULL; 619 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 620 } 621 /* 622 * Reset cmd->data_length to individual block_size in order to not 623 * confuse backend drivers that depend on this value matching the 624 * size of the I/O being submitted. 625 */ 626 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 627 628 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 629 DMA_FROM_DEVICE); 630 if (ret) { 631 cmd->transport_complete_callback = NULL; 632 up(&dev->caw_sem); 633 return ret; 634 } 635 /* 636 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 637 * upon MISCOMPARE, or in compare_and_write_done() upon completion 638 * of WRITE instance user-data. 639 */ 640 return TCM_NO_SENSE; 641 } 642 643 static int 644 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 645 bool is_write, struct se_cmd *cmd) 646 { 647 if (is_write) { 648 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 649 protect ? TARGET_PROT_DOUT_PASS : 650 TARGET_PROT_DOUT_INSERT; 651 switch (protect) { 652 case 0x0: 653 case 0x3: 654 cmd->prot_checks = 0; 655 break; 656 case 0x1: 657 case 0x5: 658 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 659 if (prot_type == TARGET_DIF_TYPE1_PROT) 660 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 661 break; 662 case 0x2: 663 if (prot_type == TARGET_DIF_TYPE1_PROT) 664 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 665 break; 666 case 0x4: 667 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 668 break; 669 default: 670 pr_err("Unsupported protect field %d\n", protect); 671 return -EINVAL; 672 } 673 } else { 674 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 675 protect ? TARGET_PROT_DIN_PASS : 676 TARGET_PROT_DIN_STRIP; 677 switch (protect) { 678 case 0x0: 679 case 0x1: 680 case 0x5: 681 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 682 if (prot_type == TARGET_DIF_TYPE1_PROT) 683 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 684 break; 685 case 0x2: 686 if (prot_type == TARGET_DIF_TYPE1_PROT) 687 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 688 break; 689 case 0x3: 690 cmd->prot_checks = 0; 691 break; 692 case 0x4: 693 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 694 break; 695 default: 696 pr_err("Unsupported protect field %d\n", protect); 697 return -EINVAL; 698 } 699 } 700 701 return 0; 702 } 703 704 static sense_reason_t 705 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 706 u32 sectors, bool is_write) 707 { 708 u8 protect = cdb[1] >> 5; 709 int sp_ops = cmd->se_sess->sup_prot_ops; 710 int pi_prot_type = dev->dev_attrib.pi_prot_type; 711 bool fabric_prot = false; 712 713 if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 714 if (unlikely(protect && 715 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 716 pr_err("CDB contains protect bit, but device + fabric does" 717 " not advertise PROTECT=1 feature bit\n"); 718 return TCM_INVALID_CDB_FIELD; 719 } 720 if (cmd->prot_pto) 721 return TCM_NO_SENSE; 722 } 723 724 switch (dev->dev_attrib.pi_prot_type) { 725 case TARGET_DIF_TYPE3_PROT: 726 cmd->reftag_seed = 0xffffffff; 727 break; 728 case TARGET_DIF_TYPE2_PROT: 729 if (protect) 730 return TCM_INVALID_CDB_FIELD; 731 732 cmd->reftag_seed = cmd->t_task_lba; 733 break; 734 case TARGET_DIF_TYPE1_PROT: 735 cmd->reftag_seed = cmd->t_task_lba; 736 break; 737 case TARGET_DIF_TYPE0_PROT: 738 /* 739 * See if the fabric supports T10-PI, and the session has been 740 * configured to allow export PROTECT=1 feature bit with backend 741 * devices that don't support T10-PI. 742 */ 743 fabric_prot = is_write ? 744 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 745 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 746 747 if (fabric_prot && cmd->se_sess->sess_prot_type) { 748 pi_prot_type = cmd->se_sess->sess_prot_type; 749 break; 750 } 751 if (!protect) 752 return TCM_NO_SENSE; 753 /* Fallthrough */ 754 default: 755 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 756 "PROTECT: 0x%02x\n", cdb[0], protect); 757 return TCM_INVALID_CDB_FIELD; 758 } 759 760 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 761 return TCM_INVALID_CDB_FIELD; 762 763 cmd->prot_type = pi_prot_type; 764 cmd->prot_length = dev->prot_length * sectors; 765 766 /** 767 * In case protection information exists over the wire 768 * we modify command data length to describe pure data. 769 * The actual transfer length is data length + protection 770 * length 771 **/ 772 if (protect) 773 cmd->data_length = sectors * dev->dev_attrib.block_size; 774 775 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 776 "prot_op=%d prot_checks=%d\n", 777 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 778 cmd->prot_op, cmd->prot_checks); 779 780 return TCM_NO_SENSE; 781 } 782 783 static int 784 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 785 { 786 if (cdb[1] & 0x10) { 787 /* see explanation in spc_emulate_modesense */ 788 if (!target_check_fua(dev)) { 789 pr_err("Got CDB: 0x%02x with DPO bit set, but device" 790 " does not advertise support for DPO\n", cdb[0]); 791 return -EINVAL; 792 } 793 } 794 if (cdb[1] & 0x8) { 795 if (!target_check_fua(dev)) { 796 pr_err("Got CDB: 0x%02x with FUA bit set, but device" 797 " does not advertise support for FUA write\n", 798 cdb[0]); 799 return -EINVAL; 800 } 801 cmd->se_cmd_flags |= SCF_FUA; 802 } 803 return 0; 804 } 805 806 sense_reason_t 807 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 808 { 809 struct se_device *dev = cmd->se_dev; 810 unsigned char *cdb = cmd->t_task_cdb; 811 unsigned int size; 812 u32 sectors = 0; 813 sense_reason_t ret; 814 815 cmd->protocol_data = ops; 816 817 switch (cdb[0]) { 818 case READ_6: 819 sectors = transport_get_sectors_6(cdb); 820 cmd->t_task_lba = transport_lba_21(cdb); 821 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 822 cmd->execute_cmd = sbc_execute_rw; 823 break; 824 case READ_10: 825 sectors = transport_get_sectors_10(cdb); 826 cmd->t_task_lba = transport_lba_32(cdb); 827 828 if (sbc_check_dpofua(dev, cmd, cdb)) 829 return TCM_INVALID_CDB_FIELD; 830 831 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 832 if (ret) 833 return ret; 834 835 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 836 cmd->execute_cmd = sbc_execute_rw; 837 break; 838 case READ_12: 839 sectors = transport_get_sectors_12(cdb); 840 cmd->t_task_lba = transport_lba_32(cdb); 841 842 if (sbc_check_dpofua(dev, cmd, cdb)) 843 return TCM_INVALID_CDB_FIELD; 844 845 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 846 if (ret) 847 return ret; 848 849 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 850 cmd->execute_cmd = sbc_execute_rw; 851 break; 852 case READ_16: 853 sectors = transport_get_sectors_16(cdb); 854 cmd->t_task_lba = transport_lba_64(cdb); 855 856 if (sbc_check_dpofua(dev, cmd, cdb)) 857 return TCM_INVALID_CDB_FIELD; 858 859 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 860 if (ret) 861 return ret; 862 863 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 864 cmd->execute_cmd = sbc_execute_rw; 865 break; 866 case WRITE_6: 867 sectors = transport_get_sectors_6(cdb); 868 cmd->t_task_lba = transport_lba_21(cdb); 869 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 870 cmd->execute_cmd = sbc_execute_rw; 871 break; 872 case WRITE_10: 873 case WRITE_VERIFY: 874 sectors = transport_get_sectors_10(cdb); 875 cmd->t_task_lba = transport_lba_32(cdb); 876 877 if (sbc_check_dpofua(dev, cmd, cdb)) 878 return TCM_INVALID_CDB_FIELD; 879 880 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 881 if (ret) 882 return ret; 883 884 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 885 cmd->execute_cmd = sbc_execute_rw; 886 break; 887 case WRITE_12: 888 sectors = transport_get_sectors_12(cdb); 889 cmd->t_task_lba = transport_lba_32(cdb); 890 891 if (sbc_check_dpofua(dev, cmd, cdb)) 892 return TCM_INVALID_CDB_FIELD; 893 894 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 895 if (ret) 896 return ret; 897 898 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 899 cmd->execute_cmd = sbc_execute_rw; 900 break; 901 case WRITE_16: 902 case WRITE_VERIFY_16: 903 sectors = transport_get_sectors_16(cdb); 904 cmd->t_task_lba = transport_lba_64(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 XDWRITEREAD_10: 917 if (cmd->data_direction != DMA_TO_DEVICE || 918 !(cmd->se_cmd_flags & SCF_BIDI)) 919 return TCM_INVALID_CDB_FIELD; 920 sectors = transport_get_sectors_10(cdb); 921 922 if (sbc_check_dpofua(dev, cmd, cdb)) 923 return TCM_INVALID_CDB_FIELD; 924 925 cmd->t_task_lba = transport_lba_32(cdb); 926 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 927 928 /* 929 * Setup BIDI XOR callback to be run after I/O completion. 930 */ 931 cmd->execute_cmd = sbc_execute_rw; 932 cmd->transport_complete_callback = &xdreadwrite_callback; 933 break; 934 case VARIABLE_LENGTH_CMD: 935 { 936 u16 service_action = get_unaligned_be16(&cdb[8]); 937 switch (service_action) { 938 case XDWRITEREAD_32: 939 sectors = transport_get_sectors_32(cdb); 940 941 if (sbc_check_dpofua(dev, cmd, cdb)) 942 return TCM_INVALID_CDB_FIELD; 943 /* 944 * Use WRITE_32 and READ_32 opcodes for the emulated 945 * XDWRITE_READ_32 logic. 946 */ 947 cmd->t_task_lba = transport_lba_64_ext(cdb); 948 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 949 950 /* 951 * Setup BIDI XOR callback to be run during after I/O 952 * completion. 953 */ 954 cmd->execute_cmd = sbc_execute_rw; 955 cmd->transport_complete_callback = &xdreadwrite_callback; 956 break; 957 case WRITE_SAME_32: 958 sectors = transport_get_sectors_32(cdb); 959 if (!sectors) { 960 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 961 " supported\n"); 962 return TCM_INVALID_CDB_FIELD; 963 } 964 965 size = sbc_get_size(cmd, 1); 966 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 967 968 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 969 if (ret) 970 return ret; 971 break; 972 default: 973 pr_err("VARIABLE_LENGTH_CMD service action" 974 " 0x%04x not supported\n", service_action); 975 return TCM_UNSUPPORTED_SCSI_OPCODE; 976 } 977 break; 978 } 979 case COMPARE_AND_WRITE: 980 if (!dev->dev_attrib.emulate_caw) { 981 pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject" 982 " COMPARE_AND_WRITE\n", dev->se_hba->backend->ops->name, 983 dev->dev_group.cg_item.ci_name, dev->t10_wwn.unit_serial); 984 return TCM_UNSUPPORTED_SCSI_OPCODE; 985 } 986 sectors = cdb[13]; 987 /* 988 * Currently enforce COMPARE_AND_WRITE for a single sector 989 */ 990 if (sectors > 1) { 991 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 992 " than 1\n", sectors); 993 return TCM_INVALID_CDB_FIELD; 994 } 995 if (sbc_check_dpofua(dev, cmd, cdb)) 996 return TCM_INVALID_CDB_FIELD; 997 998 /* 999 * Double size because we have two buffers, note that 1000 * zero is not an error.. 1001 */ 1002 size = 2 * sbc_get_size(cmd, sectors); 1003 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1004 cmd->t_task_nolb = sectors; 1005 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 1006 cmd->execute_cmd = sbc_compare_and_write; 1007 cmd->transport_complete_callback = compare_and_write_callback; 1008 break; 1009 case READ_CAPACITY: 1010 size = READ_CAP_LEN; 1011 cmd->execute_cmd = sbc_emulate_readcapacity; 1012 break; 1013 case SERVICE_ACTION_IN_16: 1014 switch (cmd->t_task_cdb[1] & 0x1f) { 1015 case SAI_READ_CAPACITY_16: 1016 cmd->execute_cmd = sbc_emulate_readcapacity_16; 1017 break; 1018 case SAI_REPORT_REFERRALS: 1019 cmd->execute_cmd = target_emulate_report_referrals; 1020 break; 1021 default: 1022 pr_err("Unsupported SA: 0x%02x\n", 1023 cmd->t_task_cdb[1] & 0x1f); 1024 return TCM_INVALID_CDB_FIELD; 1025 } 1026 size = get_unaligned_be32(&cdb[10]); 1027 break; 1028 case SYNCHRONIZE_CACHE: 1029 case SYNCHRONIZE_CACHE_16: 1030 if (cdb[0] == SYNCHRONIZE_CACHE) { 1031 sectors = transport_get_sectors_10(cdb); 1032 cmd->t_task_lba = transport_lba_32(cdb); 1033 } else { 1034 sectors = transport_get_sectors_16(cdb); 1035 cmd->t_task_lba = transport_lba_64(cdb); 1036 } 1037 if (ops->execute_sync_cache) { 1038 cmd->execute_cmd = ops->execute_sync_cache; 1039 goto check_lba; 1040 } 1041 size = 0; 1042 cmd->execute_cmd = sbc_emulate_noop; 1043 break; 1044 case UNMAP: 1045 if (!ops->execute_unmap) 1046 return TCM_UNSUPPORTED_SCSI_OPCODE; 1047 1048 if (!dev->dev_attrib.emulate_tpu) { 1049 pr_err("Got UNMAP, but backend device has" 1050 " emulate_tpu disabled\n"); 1051 return TCM_UNSUPPORTED_SCSI_OPCODE; 1052 } 1053 size = get_unaligned_be16(&cdb[7]); 1054 cmd->execute_cmd = sbc_execute_unmap; 1055 break; 1056 case WRITE_SAME_16: 1057 sectors = transport_get_sectors_16(cdb); 1058 if (!sectors) { 1059 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1060 return TCM_INVALID_CDB_FIELD; 1061 } 1062 1063 size = sbc_get_size(cmd, 1); 1064 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1065 1066 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1067 if (ret) 1068 return ret; 1069 break; 1070 case WRITE_SAME: 1071 sectors = transport_get_sectors_10(cdb); 1072 if (!sectors) { 1073 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1074 return TCM_INVALID_CDB_FIELD; 1075 } 1076 1077 size = sbc_get_size(cmd, 1); 1078 cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1079 1080 /* 1081 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1082 * of byte 1 bit 3 UNMAP instead of original reserved field 1083 */ 1084 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1085 if (ret) 1086 return ret; 1087 break; 1088 case VERIFY: 1089 case VERIFY_16: 1090 size = 0; 1091 if (cdb[0] == VERIFY) { 1092 sectors = transport_get_sectors_10(cdb); 1093 cmd->t_task_lba = transport_lba_32(cdb); 1094 } else { 1095 sectors = transport_get_sectors_16(cdb); 1096 cmd->t_task_lba = transport_lba_64(cdb); 1097 } 1098 cmd->execute_cmd = sbc_emulate_noop; 1099 goto check_lba; 1100 case REZERO_UNIT: 1101 case SEEK_6: 1102 case SEEK_10: 1103 /* 1104 * There are still clients out there which use these old SCSI-2 1105 * commands. This mainly happens when running VMs with legacy 1106 * guest systems, connected via SCSI command pass-through to 1107 * iSCSI targets. Make them happy and return status GOOD. 1108 */ 1109 size = 0; 1110 cmd->execute_cmd = sbc_emulate_noop; 1111 break; 1112 case START_STOP: 1113 size = 0; 1114 cmd->execute_cmd = sbc_emulate_startstop; 1115 break; 1116 default: 1117 ret = spc_parse_cdb(cmd, &size); 1118 if (ret) 1119 return ret; 1120 } 1121 1122 /* reject any command that we don't have a handler for */ 1123 if (!cmd->execute_cmd) 1124 return TCM_UNSUPPORTED_SCSI_OPCODE; 1125 1126 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 1127 unsigned long long end_lba; 1128 check_lba: 1129 end_lba = dev->transport->get_blocks(dev) + 1; 1130 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1131 ((cmd->t_task_lba + sectors) > end_lba)) { 1132 pr_err("cmd exceeds last lba %llu " 1133 "(lba %llu, sectors %u)\n", 1134 end_lba, cmd->t_task_lba, sectors); 1135 return TCM_ADDRESS_OUT_OF_RANGE; 1136 } 1137 1138 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 1139 size = sbc_get_size(cmd, sectors); 1140 } 1141 1142 return target_cmd_size_check(cmd, size); 1143 } 1144 EXPORT_SYMBOL(sbc_parse_cdb); 1145 1146 u32 sbc_get_device_type(struct se_device *dev) 1147 { 1148 return TYPE_DISK; 1149 } 1150 EXPORT_SYMBOL(sbc_get_device_type); 1151 1152 static sense_reason_t 1153 sbc_execute_unmap(struct se_cmd *cmd) 1154 { 1155 struct sbc_ops *ops = cmd->protocol_data; 1156 struct se_device *dev = cmd->se_dev; 1157 unsigned char *buf, *ptr = NULL; 1158 sector_t lba; 1159 int size; 1160 u32 range; 1161 sense_reason_t ret = 0; 1162 int dl, bd_dl; 1163 1164 /* We never set ANC_SUP */ 1165 if (cmd->t_task_cdb[1]) 1166 return TCM_INVALID_CDB_FIELD; 1167 1168 if (cmd->data_length == 0) { 1169 target_complete_cmd(cmd, SAM_STAT_GOOD); 1170 return 0; 1171 } 1172 1173 if (cmd->data_length < 8) { 1174 pr_warn("UNMAP parameter list length %u too small\n", 1175 cmd->data_length); 1176 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1177 } 1178 1179 buf = transport_kmap_data_sg(cmd); 1180 if (!buf) 1181 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1182 1183 dl = get_unaligned_be16(&buf[0]); 1184 bd_dl = get_unaligned_be16(&buf[2]); 1185 1186 size = cmd->data_length - 8; 1187 if (bd_dl > size) 1188 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1189 cmd->data_length, bd_dl); 1190 else 1191 size = bd_dl; 1192 1193 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1194 ret = TCM_INVALID_PARAMETER_LIST; 1195 goto err; 1196 } 1197 1198 /* First UNMAP block descriptor starts at 8 byte offset */ 1199 ptr = &buf[8]; 1200 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1201 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1202 1203 while (size >= 16) { 1204 lba = get_unaligned_be64(&ptr[0]); 1205 range = get_unaligned_be32(&ptr[8]); 1206 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1207 (unsigned long long)lba, range); 1208 1209 if (range > dev->dev_attrib.max_unmap_lba_count) { 1210 ret = TCM_INVALID_PARAMETER_LIST; 1211 goto err; 1212 } 1213 1214 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1215 ret = TCM_ADDRESS_OUT_OF_RANGE; 1216 goto err; 1217 } 1218 1219 if (range) { 1220 ret = ops->execute_unmap(cmd, lba, range); 1221 if (ret) 1222 goto err; 1223 } 1224 1225 ptr += 16; 1226 size -= 16; 1227 } 1228 1229 err: 1230 transport_kunmap_data_sg(cmd); 1231 if (!ret) 1232 target_complete_cmd(cmd, GOOD); 1233 return ret; 1234 } 1235 1236 void 1237 sbc_dif_generate(struct se_cmd *cmd) 1238 { 1239 struct se_device *dev = cmd->se_dev; 1240 struct t10_pi_tuple *sdt; 1241 struct scatterlist *dsg = cmd->t_data_sg, *psg; 1242 sector_t sector = cmd->t_task_lba; 1243 void *daddr, *paddr; 1244 int i, j, offset = 0; 1245 unsigned int block_size = dev->dev_attrib.block_size; 1246 1247 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1248 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1249 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1250 1251 for (j = 0; j < psg->length; 1252 j += sizeof(*sdt)) { 1253 __u16 crc; 1254 unsigned int avail; 1255 1256 if (offset >= dsg->length) { 1257 offset -= dsg->length; 1258 kunmap_atomic(daddr - dsg->offset); 1259 dsg = sg_next(dsg); 1260 if (!dsg) { 1261 kunmap_atomic(paddr - psg->offset); 1262 return; 1263 } 1264 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1265 } 1266 1267 sdt = paddr + j; 1268 avail = min(block_size, dsg->length - offset); 1269 crc = crc_t10dif(daddr + offset, avail); 1270 if (avail < block_size) { 1271 kunmap_atomic(daddr - dsg->offset); 1272 dsg = sg_next(dsg); 1273 if (!dsg) { 1274 kunmap_atomic(paddr - psg->offset); 1275 return; 1276 } 1277 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1278 offset = block_size - avail; 1279 crc = crc_t10dif_update(crc, daddr, offset); 1280 } else { 1281 offset += block_size; 1282 } 1283 1284 sdt->guard_tag = cpu_to_be16(crc); 1285 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 1286 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 1287 sdt->app_tag = 0; 1288 1289 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 1290 " app_tag: 0x%04x ref_tag: %u\n", 1291 (cmd->data_direction == DMA_TO_DEVICE) ? 1292 "WRITE" : "READ", (unsigned long long)sector, 1293 sdt->guard_tag, sdt->app_tag, 1294 be32_to_cpu(sdt->ref_tag)); 1295 1296 sector++; 1297 } 1298 1299 kunmap_atomic(daddr - dsg->offset); 1300 kunmap_atomic(paddr - psg->offset); 1301 } 1302 } 1303 1304 static sense_reason_t 1305 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, 1306 __u16 crc, sector_t sector, unsigned int ei_lba) 1307 { 1308 __be16 csum; 1309 1310 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1311 goto check_ref; 1312 1313 csum = cpu_to_be16(crc); 1314 1315 if (sdt->guard_tag != csum) { 1316 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1317 " csum 0x%04x\n", (unsigned long long)sector, 1318 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1319 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1320 } 1321 1322 check_ref: 1323 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1324 return 0; 1325 1326 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 1327 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1328 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1329 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1330 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1331 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1332 } 1333 1334 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 1335 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1336 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1337 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1338 be32_to_cpu(sdt->ref_tag), ei_lba); 1339 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1340 } 1341 1342 return 0; 1343 } 1344 1345 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1346 struct scatterlist *sg, int sg_off) 1347 { 1348 struct se_device *dev = cmd->se_dev; 1349 struct scatterlist *psg; 1350 void *paddr, *addr; 1351 unsigned int i, len, left; 1352 unsigned int offset = sg_off; 1353 1354 if (!sg) 1355 return; 1356 1357 left = sectors * dev->prot_length; 1358 1359 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1360 unsigned int psg_len, copied = 0; 1361 1362 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1363 psg_len = min(left, psg->length); 1364 while (psg_len) { 1365 len = min(psg_len, sg->length - offset); 1366 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1367 1368 if (read) 1369 memcpy(paddr + copied, addr, len); 1370 else 1371 memcpy(addr, paddr + copied, len); 1372 1373 left -= len; 1374 offset += len; 1375 copied += len; 1376 psg_len -= len; 1377 1378 kunmap_atomic(addr - sg->offset - offset); 1379 1380 if (offset >= sg->length) { 1381 sg = sg_next(sg); 1382 offset = 0; 1383 } 1384 } 1385 kunmap_atomic(paddr - psg->offset); 1386 } 1387 } 1388 EXPORT_SYMBOL(sbc_dif_copy_prot); 1389 1390 sense_reason_t 1391 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1392 unsigned int ei_lba, struct scatterlist *psg, int psg_off) 1393 { 1394 struct se_device *dev = cmd->se_dev; 1395 struct t10_pi_tuple *sdt; 1396 struct scatterlist *dsg = cmd->t_data_sg; 1397 sector_t sector = start; 1398 void *daddr, *paddr; 1399 int i; 1400 sense_reason_t rc; 1401 int dsg_off = 0; 1402 unsigned int block_size = dev->dev_attrib.block_size; 1403 1404 for (; psg && sector < start + sectors; psg = sg_next(psg)) { 1405 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1406 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1407 1408 for (i = psg_off; i < psg->length && 1409 sector < start + sectors; 1410 i += sizeof(*sdt)) { 1411 __u16 crc; 1412 unsigned int avail; 1413 1414 if (dsg_off >= dsg->length) { 1415 dsg_off -= dsg->length; 1416 kunmap_atomic(daddr - dsg->offset); 1417 dsg = sg_next(dsg); 1418 if (!dsg) { 1419 kunmap_atomic(paddr - psg->offset); 1420 return 0; 1421 } 1422 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1423 } 1424 1425 sdt = paddr + i; 1426 1427 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1428 " app_tag: 0x%04x ref_tag: %u\n", 1429 (unsigned long long)sector, sdt->guard_tag, 1430 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1431 1432 if (sdt->app_tag == T10_PI_APP_ESCAPE) { 1433 dsg_off += block_size; 1434 goto next; 1435 } 1436 1437 avail = min(block_size, dsg->length - dsg_off); 1438 crc = crc_t10dif(daddr + dsg_off, avail); 1439 if (avail < block_size) { 1440 kunmap_atomic(daddr - dsg->offset); 1441 dsg = sg_next(dsg); 1442 if (!dsg) { 1443 kunmap_atomic(paddr - psg->offset); 1444 return 0; 1445 } 1446 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1447 dsg_off = block_size - avail; 1448 crc = crc_t10dif_update(crc, daddr, dsg_off); 1449 } else { 1450 dsg_off += block_size; 1451 } 1452 1453 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 1454 if (rc) { 1455 kunmap_atomic(daddr - dsg->offset); 1456 kunmap_atomic(paddr - psg->offset); 1457 cmd->bad_sector = sector; 1458 return rc; 1459 } 1460 next: 1461 sector++; 1462 ei_lba++; 1463 } 1464 1465 psg_off = 0; 1466 kunmap_atomic(daddr - dsg->offset); 1467 kunmap_atomic(paddr - psg->offset); 1468 } 1469 1470 return 0; 1471 } 1472 EXPORT_SYMBOL(sbc_dif_verify); 1473