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 struct se_session *sess = cmd->se_sess; 93 unsigned char *rbuf; 94 unsigned char buf[32]; 95 unsigned long long blocks = dev->transport->get_blocks(dev); 96 97 memset(buf, 0, sizeof(buf)); 98 buf[0] = (blocks >> 56) & 0xff; 99 buf[1] = (blocks >> 48) & 0xff; 100 buf[2] = (blocks >> 40) & 0xff; 101 buf[3] = (blocks >> 32) & 0xff; 102 buf[4] = (blocks >> 24) & 0xff; 103 buf[5] = (blocks >> 16) & 0xff; 104 buf[6] = (blocks >> 8) & 0xff; 105 buf[7] = blocks & 0xff; 106 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 107 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 108 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 109 buf[11] = dev->dev_attrib.block_size & 0xff; 110 /* 111 * Set P_TYPE and PROT_EN bits for DIF support 112 */ 113 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 114 if (dev->dev_attrib.pi_prot_type) 115 buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1; 116 } 117 118 if (dev->transport->get_lbppbe) 119 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 120 121 if (dev->transport->get_alignment_offset_lbas) { 122 u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 123 buf[14] = (lalba >> 8) & 0x3f; 124 buf[15] = lalba & 0xff; 125 } 126 127 /* 128 * Set Thin Provisioning Enable bit following sbc3r22 in section 129 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 130 */ 131 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 132 buf[14] |= 0x80; 133 134 rbuf = transport_kmap_data_sg(cmd); 135 if (rbuf) { 136 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 137 transport_kunmap_data_sg(cmd); 138 } 139 140 target_complete_cmd(cmd, GOOD); 141 return 0; 142 } 143 144 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 145 { 146 u32 num_blocks; 147 148 if (cmd->t_task_cdb[0] == WRITE_SAME) 149 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 150 else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 151 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 152 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 153 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 154 155 /* 156 * Use the explicit range when non zero is supplied, otherwise calculate 157 * the remaining range based on ->get_blocks() - starting LBA. 158 */ 159 if (num_blocks) 160 return num_blocks; 161 162 return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 163 cmd->t_task_lba + 1; 164 } 165 EXPORT_SYMBOL(sbc_get_write_same_sectors); 166 167 static sense_reason_t 168 sbc_emulate_noop(struct se_cmd *cmd) 169 { 170 target_complete_cmd(cmd, GOOD); 171 return 0; 172 } 173 174 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 175 { 176 return cmd->se_dev->dev_attrib.block_size * sectors; 177 } 178 179 static int sbc_check_valid_sectors(struct se_cmd *cmd) 180 { 181 struct se_device *dev = cmd->se_dev; 182 unsigned long long end_lba; 183 u32 sectors; 184 185 sectors = cmd->data_length / dev->dev_attrib.block_size; 186 end_lba = dev->transport->get_blocks(dev) + 1; 187 188 if (cmd->t_task_lba + sectors > end_lba) { 189 pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", 190 cmd->t_task_lba, sectors, end_lba); 191 return -EINVAL; 192 } 193 194 return 0; 195 } 196 197 static inline u32 transport_get_sectors_6(unsigned char *cdb) 198 { 199 /* 200 * Use 8-bit sector value. SBC-3 says: 201 * 202 * A TRANSFER LENGTH field set to zero specifies that 256 203 * logical blocks shall be written. Any other value 204 * specifies the number of logical blocks that shall be 205 * written. 206 */ 207 return cdb[4] ? : 256; 208 } 209 210 static inline u32 transport_get_sectors_10(unsigned char *cdb) 211 { 212 return (u32)(cdb[7] << 8) + cdb[8]; 213 } 214 215 static inline u32 transport_get_sectors_12(unsigned char *cdb) 216 { 217 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 218 } 219 220 static inline u32 transport_get_sectors_16(unsigned char *cdb) 221 { 222 return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 223 (cdb[12] << 8) + cdb[13]; 224 } 225 226 /* 227 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 228 */ 229 static inline u32 transport_get_sectors_32(unsigned char *cdb) 230 { 231 return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 232 (cdb[30] << 8) + cdb[31]; 233 234 } 235 236 static inline u32 transport_lba_21(unsigned char *cdb) 237 { 238 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 239 } 240 241 static inline u32 transport_lba_32(unsigned char *cdb) 242 { 243 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 244 } 245 246 static inline unsigned long long transport_lba_64(unsigned char *cdb) 247 { 248 unsigned int __v1, __v2; 249 250 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 251 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 252 253 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 254 } 255 256 /* 257 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 258 */ 259 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 260 { 261 unsigned int __v1, __v2; 262 263 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 264 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 265 266 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 267 } 268 269 static sense_reason_t 270 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 271 { 272 unsigned int sectors = sbc_get_write_same_sectors(cmd); 273 274 if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 275 pr_err("WRITE_SAME PBDATA and LBDATA" 276 " bits not supported for Block Discard" 277 " Emulation\n"); 278 return TCM_UNSUPPORTED_SCSI_OPCODE; 279 } 280 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 281 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 282 sectors, cmd->se_dev->dev_attrib.max_write_same_len); 283 return TCM_INVALID_CDB_FIELD; 284 } 285 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 286 if (flags[0] & 0x10) { 287 pr_warn("WRITE SAME with ANCHOR not supported\n"); 288 return TCM_INVALID_CDB_FIELD; 289 } 290 /* 291 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 292 * translated into block discard requests within backend code. 293 */ 294 if (flags[0] & 0x08) { 295 if (!ops->execute_write_same_unmap) 296 return TCM_UNSUPPORTED_SCSI_OPCODE; 297 298 cmd->execute_cmd = ops->execute_write_same_unmap; 299 return 0; 300 } 301 if (!ops->execute_write_same) 302 return TCM_UNSUPPORTED_SCSI_OPCODE; 303 304 cmd->execute_cmd = ops->execute_write_same; 305 return 0; 306 } 307 308 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) 309 { 310 unsigned char *buf, *addr; 311 struct scatterlist *sg; 312 unsigned int offset; 313 sense_reason_t ret = TCM_NO_SENSE; 314 int i, count; 315 /* 316 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 317 * 318 * 1) read the specified logical block(s); 319 * 2) transfer logical blocks from the data-out buffer; 320 * 3) XOR the logical blocks transferred from the data-out buffer with 321 * the logical blocks read, storing the resulting XOR data in a buffer; 322 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 323 * blocks transferred from the data-out buffer; and 324 * 5) transfer the resulting XOR data to the data-in buffer. 325 */ 326 buf = kmalloc(cmd->data_length, GFP_KERNEL); 327 if (!buf) { 328 pr_err("Unable to allocate xor_callback buf\n"); 329 return TCM_OUT_OF_RESOURCES; 330 } 331 /* 332 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 333 * into the locally allocated *buf 334 */ 335 sg_copy_to_buffer(cmd->t_data_sg, 336 cmd->t_data_nents, 337 buf, 338 cmd->data_length); 339 340 /* 341 * Now perform the XOR against the BIDI read memory located at 342 * cmd->t_mem_bidi_list 343 */ 344 345 offset = 0; 346 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 347 addr = kmap_atomic(sg_page(sg)); 348 if (!addr) { 349 ret = TCM_OUT_OF_RESOURCES; 350 goto out; 351 } 352 353 for (i = 0; i < sg->length; i++) 354 *(addr + sg->offset + i) ^= *(buf + offset + i); 355 356 offset += sg->length; 357 kunmap_atomic(addr); 358 } 359 360 out: 361 kfree(buf); 362 return ret; 363 } 364 365 static sense_reason_t 366 sbc_execute_rw(struct se_cmd *cmd) 367 { 368 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 369 cmd->data_direction); 370 } 371 372 static sense_reason_t compare_and_write_post(struct se_cmd *cmd) 373 { 374 struct se_device *dev = cmd->se_dev; 375 376 /* 377 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 378 * within target_complete_ok_work() if the command was successfully 379 * sent to the backend driver. 380 */ 381 spin_lock_irq(&cmd->t_state_lock); 382 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 383 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 384 spin_unlock_irq(&cmd->t_state_lock); 385 386 /* 387 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 388 * before the original READ I/O submission. 389 */ 390 up(&dev->caw_sem); 391 392 return TCM_NO_SENSE; 393 } 394 395 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) 396 { 397 struct se_device *dev = cmd->se_dev; 398 struct scatterlist *write_sg = NULL, *sg; 399 unsigned char *buf = NULL, *addr; 400 struct sg_mapping_iter m; 401 unsigned int offset = 0, len; 402 unsigned int nlbas = cmd->t_task_nolb; 403 unsigned int block_size = dev->dev_attrib.block_size; 404 unsigned int compare_len = (nlbas * block_size); 405 sense_reason_t ret = TCM_NO_SENSE; 406 int rc, i; 407 408 /* 409 * Handle early failure in transport_generic_request_failure(), 410 * which will not have taken ->caw_mutex yet.. 411 */ 412 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) 413 return TCM_NO_SENSE; 414 /* 415 * Immediately exit + release dev->caw_sem if command has already 416 * been failed with a non-zero SCSI status. 417 */ 418 if (cmd->scsi_status) { 419 pr_err("compare_and_write_callback: non zero scsi_status:" 420 " 0x%02x\n", cmd->scsi_status); 421 goto out; 422 } 423 424 buf = kzalloc(cmd->data_length, GFP_KERNEL); 425 if (!buf) { 426 pr_err("Unable to allocate compare_and_write buf\n"); 427 ret = TCM_OUT_OF_RESOURCES; 428 goto out; 429 } 430 431 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 432 GFP_KERNEL); 433 if (!write_sg) { 434 pr_err("Unable to allocate compare_and_write sg\n"); 435 ret = TCM_OUT_OF_RESOURCES; 436 goto out; 437 } 438 sg_init_table(write_sg, cmd->t_data_nents); 439 /* 440 * Setup verify and write data payloads from total NumberLBAs. 441 */ 442 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 443 cmd->data_length); 444 if (!rc) { 445 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 446 ret = TCM_OUT_OF_RESOURCES; 447 goto out; 448 } 449 /* 450 * Compare against SCSI READ payload against verify payload 451 */ 452 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 453 addr = (unsigned char *)kmap_atomic(sg_page(sg)); 454 if (!addr) { 455 ret = TCM_OUT_OF_RESOURCES; 456 goto out; 457 } 458 459 len = min(sg->length, compare_len); 460 461 if (memcmp(addr, buf + offset, len)) { 462 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 463 addr, buf + offset); 464 kunmap_atomic(addr); 465 goto miscompare; 466 } 467 kunmap_atomic(addr); 468 469 offset += len; 470 compare_len -= len; 471 if (!compare_len) 472 break; 473 } 474 475 i = 0; 476 len = cmd->t_task_nolb * block_size; 477 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 478 /* 479 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 480 */ 481 while (len) { 482 sg_miter_next(&m); 483 484 if (block_size < PAGE_SIZE) { 485 sg_set_page(&write_sg[i], m.page, block_size, 486 block_size); 487 } else { 488 sg_miter_next(&m); 489 sg_set_page(&write_sg[i], m.page, block_size, 490 0); 491 } 492 len -= block_size; 493 i++; 494 } 495 sg_miter_stop(&m); 496 /* 497 * Save the original SGL + nents values before updating to new 498 * assignments, to be released in transport_free_pages() -> 499 * transport_reset_sgl_orig() 500 */ 501 cmd->t_data_sg_orig = cmd->t_data_sg; 502 cmd->t_data_sg = write_sg; 503 cmd->t_data_nents_orig = cmd->t_data_nents; 504 cmd->t_data_nents = 1; 505 506 cmd->sam_task_attr = MSG_HEAD_TAG; 507 cmd->transport_complete_callback = compare_and_write_post; 508 /* 509 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 510 * for submitting the adjusted SGL to write instance user-data. 511 */ 512 cmd->execute_cmd = sbc_execute_rw; 513 514 spin_lock_irq(&cmd->t_state_lock); 515 cmd->t_state = TRANSPORT_PROCESSING; 516 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 517 spin_unlock_irq(&cmd->t_state_lock); 518 519 __target_execute_cmd(cmd); 520 521 kfree(buf); 522 return ret; 523 524 miscompare: 525 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 526 dev->transport->name); 527 ret = TCM_MISCOMPARE_VERIFY; 528 out: 529 /* 530 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 531 * sbc_compare_and_write() before the original READ I/O submission. 532 */ 533 up(&dev->caw_sem); 534 kfree(write_sg); 535 kfree(buf); 536 return ret; 537 } 538 539 static sense_reason_t 540 sbc_compare_and_write(struct se_cmd *cmd) 541 { 542 struct se_device *dev = cmd->se_dev; 543 sense_reason_t ret; 544 int rc; 545 /* 546 * Submit the READ first for COMPARE_AND_WRITE to perform the 547 * comparision using SGLs at cmd->t_bidi_data_sg.. 548 */ 549 rc = down_interruptible(&dev->caw_sem); 550 if ((rc != 0) || signal_pending(current)) { 551 cmd->transport_complete_callback = NULL; 552 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 553 } 554 /* 555 * Reset cmd->data_length to individual block_size in order to not 556 * confuse backend drivers that depend on this value matching the 557 * size of the I/O being submitted. 558 */ 559 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 560 561 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 562 DMA_FROM_DEVICE); 563 if (ret) { 564 cmd->transport_complete_callback = NULL; 565 up(&dev->caw_sem); 566 return ret; 567 } 568 /* 569 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 570 * upon MISCOMPARE, or in compare_and_write_done() upon completion 571 * of WRITE instance user-data. 572 */ 573 return TCM_NO_SENSE; 574 } 575 576 static int 577 sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type, 578 bool is_write, struct se_cmd *cmd) 579 { 580 if (is_write) { 581 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS : 582 TARGET_PROT_DOUT_INSERT; 583 switch (protect) { 584 case 0x0: 585 case 0x3: 586 cmd->prot_checks = 0; 587 break; 588 case 0x1: 589 case 0x5: 590 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 591 if (prot_type == TARGET_DIF_TYPE1_PROT) 592 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 593 break; 594 case 0x2: 595 if (prot_type == TARGET_DIF_TYPE1_PROT) 596 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 597 break; 598 case 0x4: 599 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 600 break; 601 default: 602 pr_err("Unsupported protect field %d\n", protect); 603 return -EINVAL; 604 } 605 } else { 606 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS : 607 TARGET_PROT_DIN_STRIP; 608 switch (protect) { 609 case 0x0: 610 case 0x1: 611 case 0x5: 612 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 613 if (prot_type == TARGET_DIF_TYPE1_PROT) 614 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 615 break; 616 case 0x2: 617 if (prot_type == TARGET_DIF_TYPE1_PROT) 618 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 619 break; 620 case 0x3: 621 cmd->prot_checks = 0; 622 break; 623 case 0x4: 624 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 625 break; 626 default: 627 pr_err("Unsupported protect field %d\n", protect); 628 return -EINVAL; 629 } 630 } 631 632 return 0; 633 } 634 635 static bool 636 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 637 u32 sectors, bool is_write) 638 { 639 u8 protect = cdb[1] >> 5; 640 641 if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto) 642 return true; 643 644 switch (dev->dev_attrib.pi_prot_type) { 645 case TARGET_DIF_TYPE3_PROT: 646 cmd->reftag_seed = 0xffffffff; 647 break; 648 case TARGET_DIF_TYPE2_PROT: 649 if (protect) 650 return false; 651 652 cmd->reftag_seed = cmd->t_task_lba; 653 break; 654 case TARGET_DIF_TYPE1_PROT: 655 cmd->reftag_seed = cmd->t_task_lba; 656 break; 657 case TARGET_DIF_TYPE0_PROT: 658 default: 659 return true; 660 } 661 662 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type, 663 is_write, cmd)) 664 return false; 665 666 cmd->prot_type = dev->dev_attrib.pi_prot_type; 667 cmd->prot_length = dev->prot_length * sectors; 668 pr_debug("%s: prot_type=%d, prot_length=%d prot_op=%d prot_checks=%d\n", 669 __func__, cmd->prot_type, cmd->prot_length, 670 cmd->prot_op, cmd->prot_checks); 671 672 return true; 673 } 674 675 sense_reason_t 676 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 677 { 678 struct se_device *dev = cmd->se_dev; 679 unsigned char *cdb = cmd->t_task_cdb; 680 unsigned int size; 681 u32 sectors = 0; 682 sense_reason_t ret; 683 684 switch (cdb[0]) { 685 case READ_6: 686 sectors = transport_get_sectors_6(cdb); 687 cmd->t_task_lba = transport_lba_21(cdb); 688 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 689 cmd->execute_rw = ops->execute_rw; 690 cmd->execute_cmd = sbc_execute_rw; 691 break; 692 case READ_10: 693 sectors = transport_get_sectors_10(cdb); 694 cmd->t_task_lba = transport_lba_32(cdb); 695 696 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 697 return TCM_UNSUPPORTED_SCSI_OPCODE; 698 699 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 700 cmd->execute_rw = ops->execute_rw; 701 cmd->execute_cmd = sbc_execute_rw; 702 break; 703 case READ_12: 704 sectors = transport_get_sectors_12(cdb); 705 cmd->t_task_lba = transport_lba_32(cdb); 706 707 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 708 return TCM_UNSUPPORTED_SCSI_OPCODE; 709 710 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 711 cmd->execute_rw = ops->execute_rw; 712 cmd->execute_cmd = sbc_execute_rw; 713 break; 714 case READ_16: 715 sectors = transport_get_sectors_16(cdb); 716 cmd->t_task_lba = transport_lba_64(cdb); 717 718 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 719 return TCM_UNSUPPORTED_SCSI_OPCODE; 720 721 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 722 cmd->execute_rw = ops->execute_rw; 723 cmd->execute_cmd = sbc_execute_rw; 724 break; 725 case WRITE_6: 726 sectors = transport_get_sectors_6(cdb); 727 cmd->t_task_lba = transport_lba_21(cdb); 728 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 729 cmd->execute_rw = ops->execute_rw; 730 cmd->execute_cmd = sbc_execute_rw; 731 break; 732 case WRITE_10: 733 case WRITE_VERIFY: 734 sectors = transport_get_sectors_10(cdb); 735 cmd->t_task_lba = transport_lba_32(cdb); 736 737 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 738 return TCM_UNSUPPORTED_SCSI_OPCODE; 739 740 if (cdb[1] & 0x8) 741 cmd->se_cmd_flags |= SCF_FUA; 742 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 743 cmd->execute_rw = ops->execute_rw; 744 cmd->execute_cmd = sbc_execute_rw; 745 break; 746 case WRITE_12: 747 sectors = transport_get_sectors_12(cdb); 748 cmd->t_task_lba = transport_lba_32(cdb); 749 750 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 751 return TCM_UNSUPPORTED_SCSI_OPCODE; 752 753 if (cdb[1] & 0x8) 754 cmd->se_cmd_flags |= SCF_FUA; 755 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 756 cmd->execute_rw = ops->execute_rw; 757 cmd->execute_cmd = sbc_execute_rw; 758 break; 759 case WRITE_16: 760 sectors = transport_get_sectors_16(cdb); 761 cmd->t_task_lba = transport_lba_64(cdb); 762 763 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 764 return TCM_UNSUPPORTED_SCSI_OPCODE; 765 766 if (cdb[1] & 0x8) 767 cmd->se_cmd_flags |= SCF_FUA; 768 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 769 cmd->execute_rw = ops->execute_rw; 770 cmd->execute_cmd = sbc_execute_rw; 771 break; 772 case XDWRITEREAD_10: 773 if (cmd->data_direction != DMA_TO_DEVICE || 774 !(cmd->se_cmd_flags & SCF_BIDI)) 775 return TCM_INVALID_CDB_FIELD; 776 sectors = transport_get_sectors_10(cdb); 777 778 cmd->t_task_lba = transport_lba_32(cdb); 779 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 780 781 /* 782 * Setup BIDI XOR callback to be run after I/O completion. 783 */ 784 cmd->execute_rw = ops->execute_rw; 785 cmd->execute_cmd = sbc_execute_rw; 786 cmd->transport_complete_callback = &xdreadwrite_callback; 787 if (cdb[1] & 0x8) 788 cmd->se_cmd_flags |= SCF_FUA; 789 break; 790 case VARIABLE_LENGTH_CMD: 791 { 792 u16 service_action = get_unaligned_be16(&cdb[8]); 793 switch (service_action) { 794 case XDWRITEREAD_32: 795 sectors = transport_get_sectors_32(cdb); 796 797 /* 798 * Use WRITE_32 and READ_32 opcodes for the emulated 799 * XDWRITE_READ_32 logic. 800 */ 801 cmd->t_task_lba = transport_lba_64_ext(cdb); 802 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 803 804 /* 805 * Setup BIDI XOR callback to be run during after I/O 806 * completion. 807 */ 808 cmd->execute_rw = ops->execute_rw; 809 cmd->execute_cmd = sbc_execute_rw; 810 cmd->transport_complete_callback = &xdreadwrite_callback; 811 if (cdb[1] & 0x8) 812 cmd->se_cmd_flags |= SCF_FUA; 813 break; 814 case WRITE_SAME_32: 815 sectors = transport_get_sectors_32(cdb); 816 if (!sectors) { 817 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 818 " supported\n"); 819 return TCM_INVALID_CDB_FIELD; 820 } 821 822 size = sbc_get_size(cmd, 1); 823 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 824 825 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 826 if (ret) 827 return ret; 828 break; 829 default: 830 pr_err("VARIABLE_LENGTH_CMD service action" 831 " 0x%04x not supported\n", service_action); 832 return TCM_UNSUPPORTED_SCSI_OPCODE; 833 } 834 break; 835 } 836 case COMPARE_AND_WRITE: 837 sectors = cdb[13]; 838 /* 839 * Currently enforce COMPARE_AND_WRITE for a single sector 840 */ 841 if (sectors > 1) { 842 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 843 " than 1\n", sectors); 844 return TCM_INVALID_CDB_FIELD; 845 } 846 /* 847 * Double size because we have two buffers, note that 848 * zero is not an error.. 849 */ 850 size = 2 * sbc_get_size(cmd, sectors); 851 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 852 cmd->t_task_nolb = sectors; 853 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 854 cmd->execute_rw = ops->execute_rw; 855 cmd->execute_cmd = sbc_compare_and_write; 856 cmd->transport_complete_callback = compare_and_write_callback; 857 break; 858 case READ_CAPACITY: 859 size = READ_CAP_LEN; 860 cmd->execute_cmd = sbc_emulate_readcapacity; 861 break; 862 case SERVICE_ACTION_IN: 863 switch (cmd->t_task_cdb[1] & 0x1f) { 864 case SAI_READ_CAPACITY_16: 865 cmd->execute_cmd = sbc_emulate_readcapacity_16; 866 break; 867 case SAI_REPORT_REFERRALS: 868 cmd->execute_cmd = target_emulate_report_referrals; 869 break; 870 default: 871 pr_err("Unsupported SA: 0x%02x\n", 872 cmd->t_task_cdb[1] & 0x1f); 873 return TCM_INVALID_CDB_FIELD; 874 } 875 size = (cdb[10] << 24) | (cdb[11] << 16) | 876 (cdb[12] << 8) | cdb[13]; 877 break; 878 case SYNCHRONIZE_CACHE: 879 case SYNCHRONIZE_CACHE_16: 880 if (!ops->execute_sync_cache) { 881 size = 0; 882 cmd->execute_cmd = sbc_emulate_noop; 883 break; 884 } 885 886 /* 887 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE 888 */ 889 if (cdb[0] == SYNCHRONIZE_CACHE) { 890 sectors = transport_get_sectors_10(cdb); 891 cmd->t_task_lba = transport_lba_32(cdb); 892 } else { 893 sectors = transport_get_sectors_16(cdb); 894 cmd->t_task_lba = transport_lba_64(cdb); 895 } 896 897 size = sbc_get_size(cmd, sectors); 898 899 /* 900 * Check to ensure that LBA + Range does not exceed past end of 901 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls 902 */ 903 if (cmd->t_task_lba || sectors) { 904 if (sbc_check_valid_sectors(cmd) < 0) 905 return TCM_ADDRESS_OUT_OF_RANGE; 906 } 907 cmd->execute_cmd = ops->execute_sync_cache; 908 break; 909 case UNMAP: 910 if (!ops->execute_unmap) 911 return TCM_UNSUPPORTED_SCSI_OPCODE; 912 913 size = get_unaligned_be16(&cdb[7]); 914 cmd->execute_cmd = ops->execute_unmap; 915 break; 916 case WRITE_SAME_16: 917 sectors = transport_get_sectors_16(cdb); 918 if (!sectors) { 919 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 920 return TCM_INVALID_CDB_FIELD; 921 } 922 923 size = sbc_get_size(cmd, 1); 924 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 925 926 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 927 if (ret) 928 return ret; 929 break; 930 case WRITE_SAME: 931 sectors = transport_get_sectors_10(cdb); 932 if (!sectors) { 933 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 934 return TCM_INVALID_CDB_FIELD; 935 } 936 937 size = sbc_get_size(cmd, 1); 938 cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 939 940 /* 941 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 942 * of byte 1 bit 3 UNMAP instead of original reserved field 943 */ 944 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 945 if (ret) 946 return ret; 947 break; 948 case VERIFY: 949 size = 0; 950 cmd->execute_cmd = sbc_emulate_noop; 951 break; 952 case REZERO_UNIT: 953 case SEEK_6: 954 case SEEK_10: 955 /* 956 * There are still clients out there which use these old SCSI-2 957 * commands. This mainly happens when running VMs with legacy 958 * guest systems, connected via SCSI command pass-through to 959 * iSCSI targets. Make them happy and return status GOOD. 960 */ 961 size = 0; 962 cmd->execute_cmd = sbc_emulate_noop; 963 break; 964 default: 965 ret = spc_parse_cdb(cmd, &size); 966 if (ret) 967 return ret; 968 } 969 970 /* reject any command that we don't have a handler for */ 971 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) 972 return TCM_UNSUPPORTED_SCSI_OPCODE; 973 974 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 975 unsigned long long end_lba; 976 977 if (sectors > dev->dev_attrib.fabric_max_sectors) { 978 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 979 " big sectors %u exceeds fabric_max_sectors:" 980 " %u\n", cdb[0], sectors, 981 dev->dev_attrib.fabric_max_sectors); 982 return TCM_INVALID_CDB_FIELD; 983 } 984 if (sectors > dev->dev_attrib.hw_max_sectors) { 985 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 986 " big sectors %u exceeds backend hw_max_sectors:" 987 " %u\n", cdb[0], sectors, 988 dev->dev_attrib.hw_max_sectors); 989 return TCM_INVALID_CDB_FIELD; 990 } 991 992 end_lba = dev->transport->get_blocks(dev) + 1; 993 if (cmd->t_task_lba + sectors > end_lba) { 994 pr_err("cmd exceeds last lba %llu " 995 "(lba %llu, sectors %u)\n", 996 end_lba, cmd->t_task_lba, sectors); 997 return TCM_ADDRESS_OUT_OF_RANGE; 998 } 999 1000 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 1001 size = sbc_get_size(cmd, sectors); 1002 } 1003 1004 return target_cmd_size_check(cmd, size); 1005 } 1006 EXPORT_SYMBOL(sbc_parse_cdb); 1007 1008 u32 sbc_get_device_type(struct se_device *dev) 1009 { 1010 return TYPE_DISK; 1011 } 1012 EXPORT_SYMBOL(sbc_get_device_type); 1013 1014 sense_reason_t 1015 sbc_execute_unmap(struct se_cmd *cmd, 1016 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, 1017 sector_t, sector_t), 1018 void *priv) 1019 { 1020 struct se_device *dev = cmd->se_dev; 1021 unsigned char *buf, *ptr = NULL; 1022 sector_t lba; 1023 int size; 1024 u32 range; 1025 sense_reason_t ret = 0; 1026 int dl, bd_dl; 1027 1028 /* We never set ANC_SUP */ 1029 if (cmd->t_task_cdb[1]) 1030 return TCM_INVALID_CDB_FIELD; 1031 1032 if (cmd->data_length == 0) { 1033 target_complete_cmd(cmd, SAM_STAT_GOOD); 1034 return 0; 1035 } 1036 1037 if (cmd->data_length < 8) { 1038 pr_warn("UNMAP parameter list length %u too small\n", 1039 cmd->data_length); 1040 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1041 } 1042 1043 buf = transport_kmap_data_sg(cmd); 1044 if (!buf) 1045 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1046 1047 dl = get_unaligned_be16(&buf[0]); 1048 bd_dl = get_unaligned_be16(&buf[2]); 1049 1050 size = cmd->data_length - 8; 1051 if (bd_dl > size) 1052 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1053 cmd->data_length, bd_dl); 1054 else 1055 size = bd_dl; 1056 1057 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1058 ret = TCM_INVALID_PARAMETER_LIST; 1059 goto err; 1060 } 1061 1062 /* First UNMAP block descriptor starts at 8 byte offset */ 1063 ptr = &buf[8]; 1064 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1065 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1066 1067 while (size >= 16) { 1068 lba = get_unaligned_be64(&ptr[0]); 1069 range = get_unaligned_be32(&ptr[8]); 1070 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1071 (unsigned long long)lba, range); 1072 1073 if (range > dev->dev_attrib.max_unmap_lba_count) { 1074 ret = TCM_INVALID_PARAMETER_LIST; 1075 goto err; 1076 } 1077 1078 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1079 ret = TCM_ADDRESS_OUT_OF_RANGE; 1080 goto err; 1081 } 1082 1083 ret = do_unmap_fn(cmd, priv, lba, range); 1084 if (ret) 1085 goto err; 1086 1087 ptr += 16; 1088 size -= 16; 1089 } 1090 1091 err: 1092 transport_kunmap_data_sg(cmd); 1093 if (!ret) 1094 target_complete_cmd(cmd, GOOD); 1095 return ret; 1096 } 1097 EXPORT_SYMBOL(sbc_execute_unmap); 1098 1099 void 1100 sbc_dif_generate(struct se_cmd *cmd) 1101 { 1102 struct se_device *dev = cmd->se_dev; 1103 struct se_dif_v1_tuple *sdt; 1104 struct scatterlist *dsg, *psg = cmd->t_prot_sg; 1105 sector_t sector = cmd->t_task_lba; 1106 void *daddr, *paddr; 1107 int i, j, offset = 0; 1108 1109 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1110 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1111 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1112 1113 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1114 1115 if (offset >= psg->length) { 1116 kunmap_atomic(paddr); 1117 psg = sg_next(psg); 1118 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1119 offset = 0; 1120 } 1121 1122 sdt = paddr + offset; 1123 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, 1124 dev->dev_attrib.block_size)); 1125 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT) 1126 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 1127 sdt->app_tag = 0; 1128 1129 pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x" 1130 " app_tag: 0x%04x ref_tag: %u\n", 1131 (unsigned long long)sector, sdt->guard_tag, 1132 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1133 1134 sector++; 1135 offset += sizeof(struct se_dif_v1_tuple); 1136 } 1137 1138 kunmap_atomic(paddr); 1139 kunmap_atomic(daddr); 1140 } 1141 } 1142 1143 static sense_reason_t 1144 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, 1145 const void *p, sector_t sector, unsigned int ei_lba) 1146 { 1147 int block_size = dev->dev_attrib.block_size; 1148 __be16 csum; 1149 1150 csum = cpu_to_be16(crc_t10dif(p, block_size)); 1151 1152 if (sdt->guard_tag != csum) { 1153 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1154 " csum 0x%04x\n", (unsigned long long)sector, 1155 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1156 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1157 } 1158 1159 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && 1160 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1161 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1162 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1163 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1164 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1165 } 1166 1167 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && 1168 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1169 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1170 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1171 be32_to_cpu(sdt->ref_tag), ei_lba); 1172 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1173 } 1174 1175 return 0; 1176 } 1177 1178 static void 1179 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1180 struct scatterlist *sg, int sg_off) 1181 { 1182 struct se_device *dev = cmd->se_dev; 1183 struct scatterlist *psg; 1184 void *paddr, *addr; 1185 unsigned int i, len, left; 1186 unsigned int offset = sg_off; 1187 1188 left = sectors * dev->prot_length; 1189 1190 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1191 unsigned int psg_len, copied = 0; 1192 1193 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1194 psg_len = min(left, psg->length); 1195 while (psg_len) { 1196 len = min(psg_len, sg->length - offset); 1197 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1198 1199 if (read) 1200 memcpy(paddr + copied, addr, len); 1201 else 1202 memcpy(addr, paddr + copied, len); 1203 1204 left -= len; 1205 offset += len; 1206 copied += len; 1207 psg_len -= len; 1208 1209 if (offset >= sg->length) { 1210 sg = sg_next(sg); 1211 offset = 0; 1212 } 1213 kunmap_atomic(addr); 1214 } 1215 kunmap_atomic(paddr); 1216 } 1217 } 1218 1219 sense_reason_t 1220 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1221 unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1222 { 1223 struct se_device *dev = cmd->se_dev; 1224 struct se_dif_v1_tuple *sdt; 1225 struct scatterlist *dsg, *psg = cmd->t_prot_sg; 1226 sector_t sector = start; 1227 void *daddr, *paddr; 1228 int i, j, offset = 0; 1229 sense_reason_t rc; 1230 1231 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1232 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1233 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1234 1235 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1236 1237 if (offset >= psg->length) { 1238 kunmap_atomic(paddr); 1239 psg = sg_next(psg); 1240 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1241 offset = 0; 1242 } 1243 1244 sdt = paddr + offset; 1245 1246 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" 1247 " app_tag: 0x%04x ref_tag: %u\n", 1248 (unsigned long long)sector, sdt->guard_tag, 1249 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1250 1251 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 1252 ei_lba); 1253 if (rc) { 1254 kunmap_atomic(paddr); 1255 kunmap_atomic(daddr); 1256 cmd->bad_sector = sector; 1257 return rc; 1258 } 1259 1260 sector++; 1261 ei_lba++; 1262 offset += sizeof(struct se_dif_v1_tuple); 1263 } 1264 1265 kunmap_atomic(paddr); 1266 kunmap_atomic(daddr); 1267 } 1268 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); 1269 1270 return 0; 1271 } 1272 EXPORT_SYMBOL(sbc_dif_verify_write); 1273 1274 sense_reason_t 1275 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1276 unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1277 { 1278 struct se_device *dev = cmd->se_dev; 1279 struct se_dif_v1_tuple *sdt; 1280 struct scatterlist *dsg, *psg = sg; 1281 sector_t sector = start; 1282 void *daddr, *paddr; 1283 int i, j, offset = sg_off; 1284 sense_reason_t rc; 1285 1286 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1287 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1288 paddr = kmap_atomic(sg_page(psg)) + sg->offset; 1289 1290 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1291 1292 if (offset >= psg->length) { 1293 kunmap_atomic(paddr); 1294 psg = sg_next(psg); 1295 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1296 offset = 0; 1297 } 1298 1299 sdt = paddr + offset; 1300 1301 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1302 " app_tag: 0x%04x ref_tag: %u\n", 1303 (unsigned long long)sector, sdt->guard_tag, 1304 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1305 1306 if (sdt->app_tag == cpu_to_be16(0xffff)) { 1307 sector++; 1308 offset += sizeof(struct se_dif_v1_tuple); 1309 continue; 1310 } 1311 1312 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 1313 ei_lba); 1314 if (rc) { 1315 kunmap_atomic(paddr); 1316 kunmap_atomic(daddr); 1317 cmd->bad_sector = sector; 1318 return rc; 1319 } 1320 1321 sector++; 1322 ei_lba++; 1323 offset += sizeof(struct se_dif_v1_tuple); 1324 } 1325 1326 kunmap_atomic(paddr); 1327 kunmap_atomic(daddr); 1328 } 1329 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); 1330 1331 return 0; 1332 } 1333 EXPORT_SYMBOL(sbc_dif_verify_read); 1334