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 39static sense_reason_t 40sbc_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_with_length(cmd, GOOD, 8); 85 return 0; 86} 87 88static sense_reason_t 89sbc_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_with_length(cmd, GOOD, 32); 141 return 0; 142} 143 144sector_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} 165EXPORT_SYMBOL(sbc_get_write_same_sectors); 166 167static sense_reason_t 168sbc_emulate_noop(struct se_cmd *cmd) 169{ 170 target_complete_cmd(cmd, GOOD); 171 return 0; 172} 173 174static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 175{ 176 return cmd->se_dev->dev_attrib.block_size * sectors; 177} 178 179static inline u32 transport_get_sectors_6(unsigned char *cdb) 180{ 181 /* 182 * Use 8-bit sector value. SBC-3 says: 183 * 184 * A TRANSFER LENGTH field set to zero specifies that 256 185 * logical blocks shall be written. Any other value 186 * specifies the number of logical blocks that shall be 187 * written. 188 */ 189 return cdb[4] ? : 256; 190} 191 192static inline u32 transport_get_sectors_10(unsigned char *cdb) 193{ 194 return (u32)(cdb[7] << 8) + cdb[8]; 195} 196 197static inline u32 transport_get_sectors_12(unsigned char *cdb) 198{ 199 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 200} 201 202static inline u32 transport_get_sectors_16(unsigned char *cdb) 203{ 204 return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 205 (cdb[12] << 8) + cdb[13]; 206} 207 208/* 209 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 210 */ 211static inline u32 transport_get_sectors_32(unsigned char *cdb) 212{ 213 return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 214 (cdb[30] << 8) + cdb[31]; 215 216} 217 218static inline u32 transport_lba_21(unsigned char *cdb) 219{ 220 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 221} 222 223static inline u32 transport_lba_32(unsigned char *cdb) 224{ 225 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 226} 227 228static inline unsigned long long transport_lba_64(unsigned char *cdb) 229{ 230 unsigned int __v1, __v2; 231 232 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 233 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 234 235 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 236} 237 238/* 239 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 240 */ 241static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 242{ 243 unsigned int __v1, __v2; 244 245 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 246 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 247 248 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 249} 250 251static sense_reason_t 252sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 253{ 254 unsigned int sectors = sbc_get_write_same_sectors(cmd); 255 256 if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 257 pr_err("WRITE_SAME PBDATA and LBDATA" 258 " bits not supported for Block Discard" 259 " Emulation\n"); 260 return TCM_UNSUPPORTED_SCSI_OPCODE; 261 } 262 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 263 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 264 sectors, cmd->se_dev->dev_attrib.max_write_same_len); 265 return TCM_INVALID_CDB_FIELD; 266 } 267 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 268 if (flags[0] & 0x10) { 269 pr_warn("WRITE SAME with ANCHOR not supported\n"); 270 return TCM_INVALID_CDB_FIELD; 271 } 272 /* 273 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 274 * translated into block discard requests within backend code. 275 */ 276 if (flags[0] & 0x08) { 277 if (!ops->execute_write_same_unmap) 278 return TCM_UNSUPPORTED_SCSI_OPCODE; 279 280 cmd->execute_cmd = ops->execute_write_same_unmap; 281 return 0; 282 } 283 if (!ops->execute_write_same) 284 return TCM_UNSUPPORTED_SCSI_OPCODE; 285 286 cmd->execute_cmd = ops->execute_write_same; 287 return 0; 288} 289 290static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) 291{ 292 unsigned char *buf, *addr; 293 struct scatterlist *sg; 294 unsigned int offset; 295 sense_reason_t ret = TCM_NO_SENSE; 296 int i, count; 297 /* 298 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 299 * 300 * 1) read the specified logical block(s); 301 * 2) transfer logical blocks from the data-out buffer; 302 * 3) XOR the logical blocks transferred from the data-out buffer with 303 * the logical blocks read, storing the resulting XOR data in a buffer; 304 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 305 * blocks transferred from the data-out buffer; and 306 * 5) transfer the resulting XOR data to the data-in buffer. 307 */ 308 buf = kmalloc(cmd->data_length, GFP_KERNEL); 309 if (!buf) { 310 pr_err("Unable to allocate xor_callback buf\n"); 311 return TCM_OUT_OF_RESOURCES; 312 } 313 /* 314 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 315 * into the locally allocated *buf 316 */ 317 sg_copy_to_buffer(cmd->t_data_sg, 318 cmd->t_data_nents, 319 buf, 320 cmd->data_length); 321 322 /* 323 * Now perform the XOR against the BIDI read memory located at 324 * cmd->t_mem_bidi_list 325 */ 326 327 offset = 0; 328 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 329 addr = kmap_atomic(sg_page(sg)); 330 if (!addr) { 331 ret = TCM_OUT_OF_RESOURCES; 332 goto out; 333 } 334 335 for (i = 0; i < sg->length; i++) 336 *(addr + sg->offset + i) ^= *(buf + offset + i); 337 338 offset += sg->length; 339 kunmap_atomic(addr); 340 } 341 342out: 343 kfree(buf); 344 return ret; 345} 346 347static sense_reason_t 348sbc_execute_rw(struct se_cmd *cmd) 349{ 350 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 351 cmd->data_direction); 352} 353 354static sense_reason_t compare_and_write_post(struct se_cmd *cmd) 355{ 356 struct se_device *dev = cmd->se_dev; 357 358 /* 359 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 360 * within target_complete_ok_work() if the command was successfully 361 * sent to the backend driver. 362 */ 363 spin_lock_irq(&cmd->t_state_lock); 364 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 365 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 366 spin_unlock_irq(&cmd->t_state_lock); 367 368 /* 369 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 370 * before the original READ I/O submission. 371 */ 372 up(&dev->caw_sem); 373 374 return TCM_NO_SENSE; 375} 376 377static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) 378{ 379 struct se_device *dev = cmd->se_dev; 380 struct scatterlist *write_sg = NULL, *sg; 381 unsigned char *buf = NULL, *addr; 382 struct sg_mapping_iter m; 383 unsigned int offset = 0, len; 384 unsigned int nlbas = cmd->t_task_nolb; 385 unsigned int block_size = dev->dev_attrib.block_size; 386 unsigned int compare_len = (nlbas * block_size); 387 sense_reason_t ret = TCM_NO_SENSE; 388 int rc, i; 389 390 /* 391 * Handle early failure in transport_generic_request_failure(), 392 * which will not have taken ->caw_mutex yet.. 393 */ 394 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) 395 return TCM_NO_SENSE; 396 /* 397 * Immediately exit + release dev->caw_sem if command has already 398 * been failed with a non-zero SCSI status. 399 */ 400 if (cmd->scsi_status) { 401 pr_err("compare_and_write_callback: non zero scsi_status:" 402 " 0x%02x\n", cmd->scsi_status); 403 goto out; 404 } 405 406 buf = kzalloc(cmd->data_length, GFP_KERNEL); 407 if (!buf) { 408 pr_err("Unable to allocate compare_and_write buf\n"); 409 ret = TCM_OUT_OF_RESOURCES; 410 goto out; 411 } 412 413 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 414 GFP_KERNEL); 415 if (!write_sg) { 416 pr_err("Unable to allocate compare_and_write sg\n"); 417 ret = TCM_OUT_OF_RESOURCES; 418 goto out; 419 } 420 sg_init_table(write_sg, cmd->t_data_nents); 421 /* 422 * Setup verify and write data payloads from total NumberLBAs. 423 */ 424 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 425 cmd->data_length); 426 if (!rc) { 427 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 428 ret = TCM_OUT_OF_RESOURCES; 429 goto out; 430 } 431 /* 432 * Compare against SCSI READ payload against verify payload 433 */ 434 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 435 addr = (unsigned char *)kmap_atomic(sg_page(sg)); 436 if (!addr) { 437 ret = TCM_OUT_OF_RESOURCES; 438 goto out; 439 } 440 441 len = min(sg->length, compare_len); 442 443 if (memcmp(addr, buf + offset, len)) { 444 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 445 addr, buf + offset); 446 kunmap_atomic(addr); 447 goto miscompare; 448 } 449 kunmap_atomic(addr); 450 451 offset += len; 452 compare_len -= len; 453 if (!compare_len) 454 break; 455 } 456 457 i = 0; 458 len = cmd->t_task_nolb * block_size; 459 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 460 /* 461 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 462 */ 463 while (len) { 464 sg_miter_next(&m); 465 466 if (block_size < PAGE_SIZE) { 467 sg_set_page(&write_sg[i], m.page, block_size, 468 block_size); 469 } else { 470 sg_miter_next(&m); 471 sg_set_page(&write_sg[i], m.page, block_size, 472 0); 473 } 474 len -= block_size; 475 i++; 476 } 477 sg_miter_stop(&m); 478 /* 479 * Save the original SGL + nents values before updating to new 480 * assignments, to be released in transport_free_pages() -> 481 * transport_reset_sgl_orig() 482 */ 483 cmd->t_data_sg_orig = cmd->t_data_sg; 484 cmd->t_data_sg = write_sg; 485 cmd->t_data_nents_orig = cmd->t_data_nents; 486 cmd->t_data_nents = 1; 487 488 cmd->sam_task_attr = MSG_HEAD_TAG; 489 cmd->transport_complete_callback = compare_and_write_post; 490 /* 491 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 492 * for submitting the adjusted SGL to write instance user-data. 493 */ 494 cmd->execute_cmd = sbc_execute_rw; 495 496 spin_lock_irq(&cmd->t_state_lock); 497 cmd->t_state = TRANSPORT_PROCESSING; 498 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 499 spin_unlock_irq(&cmd->t_state_lock); 500 501 __target_execute_cmd(cmd); 502 503 kfree(buf); 504 return ret; 505 506miscompare: 507 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 508 dev->transport->name); 509 ret = TCM_MISCOMPARE_VERIFY; 510out: 511 /* 512 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 513 * sbc_compare_and_write() before the original READ I/O submission. 514 */ 515 up(&dev->caw_sem); 516 kfree(write_sg); 517 kfree(buf); 518 return ret; 519} 520 521static sense_reason_t 522sbc_compare_and_write(struct se_cmd *cmd) 523{ 524 struct se_device *dev = cmd->se_dev; 525 sense_reason_t ret; 526 int rc; 527 /* 528 * Submit the READ first for COMPARE_AND_WRITE to perform the 529 * comparision using SGLs at cmd->t_bidi_data_sg.. 530 */ 531 rc = down_interruptible(&dev->caw_sem); 532 if ((rc != 0) || signal_pending(current)) { 533 cmd->transport_complete_callback = NULL; 534 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 535 } 536 /* 537 * Reset cmd->data_length to individual block_size in order to not 538 * confuse backend drivers that depend on this value matching the 539 * size of the I/O being submitted. 540 */ 541 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 542 543 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 544 DMA_FROM_DEVICE); 545 if (ret) { 546 cmd->transport_complete_callback = NULL; 547 up(&dev->caw_sem); 548 return ret; 549 } 550 /* 551 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 552 * upon MISCOMPARE, or in compare_and_write_done() upon completion 553 * of WRITE instance user-data. 554 */ 555 return TCM_NO_SENSE; 556} 557 558static int 559sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type, 560 bool is_write, struct se_cmd *cmd) 561{ 562 if (is_write) { 563 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS : 564 TARGET_PROT_DOUT_INSERT; 565 switch (protect) { 566 case 0x0: 567 case 0x3: 568 cmd->prot_checks = 0; 569 break; 570 case 0x1: 571 case 0x5: 572 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 573 if (prot_type == TARGET_DIF_TYPE1_PROT) 574 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 575 break; 576 case 0x2: 577 if (prot_type == TARGET_DIF_TYPE1_PROT) 578 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 579 break; 580 case 0x4: 581 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 582 break; 583 default: 584 pr_err("Unsupported protect field %d\n", protect); 585 return -EINVAL; 586 } 587 } else { 588 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS : 589 TARGET_PROT_DIN_STRIP; 590 switch (protect) { 591 case 0x0: 592 case 0x1: 593 case 0x5: 594 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 595 if (prot_type == TARGET_DIF_TYPE1_PROT) 596 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 597 break; 598 case 0x2: 599 if (prot_type == TARGET_DIF_TYPE1_PROT) 600 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 601 break; 602 case 0x3: 603 cmd->prot_checks = 0; 604 break; 605 case 0x4: 606 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 607 break; 608 default: 609 pr_err("Unsupported protect field %d\n", protect); 610 return -EINVAL; 611 } 612 } 613 614 return 0; 615} 616 617static bool 618sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 619 u32 sectors, bool is_write) 620{ 621 u8 protect = cdb[1] >> 5; 622 623 if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto) 624 return true; 625 626 switch (dev->dev_attrib.pi_prot_type) { 627 case TARGET_DIF_TYPE3_PROT: 628 cmd->reftag_seed = 0xffffffff; 629 break; 630 case TARGET_DIF_TYPE2_PROT: 631 if (protect) 632 return false; 633 634 cmd->reftag_seed = cmd->t_task_lba; 635 break; 636 case TARGET_DIF_TYPE1_PROT: 637 cmd->reftag_seed = cmd->t_task_lba; 638 break; 639 case TARGET_DIF_TYPE0_PROT: 640 default: 641 return true; 642 } 643 644 if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type, 645 is_write, cmd)) 646 return false; 647 648 cmd->prot_type = dev->dev_attrib.pi_prot_type; 649 cmd->prot_length = dev->prot_length * sectors; 650 651 /** 652 * In case protection information exists over the wire 653 * we modify command data length to describe pure data. 654 * The actual transfer length is data length + protection 655 * length 656 **/ 657 if (protect) 658 cmd->data_length = sectors * dev->dev_attrib.block_size; 659 660 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 661 "prot_op=%d prot_checks=%d\n", 662 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 663 cmd->prot_op, cmd->prot_checks); 664 665 return true; 666} 667 668sense_reason_t 669sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 670{ 671 struct se_device *dev = cmd->se_dev; 672 unsigned char *cdb = cmd->t_task_cdb; 673 unsigned int size; 674 u32 sectors = 0; 675 sense_reason_t ret; 676 677 switch (cdb[0]) { 678 case READ_6: 679 sectors = transport_get_sectors_6(cdb); 680 cmd->t_task_lba = transport_lba_21(cdb); 681 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 682 cmd->execute_rw = ops->execute_rw; 683 cmd->execute_cmd = sbc_execute_rw; 684 break; 685 case READ_10: 686 sectors = transport_get_sectors_10(cdb); 687 cmd->t_task_lba = transport_lba_32(cdb); 688 689 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 690 return TCM_UNSUPPORTED_SCSI_OPCODE; 691 692 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 693 cmd->execute_rw = ops->execute_rw; 694 cmd->execute_cmd = sbc_execute_rw; 695 break; 696 case READ_12: 697 sectors = transport_get_sectors_12(cdb); 698 cmd->t_task_lba = transport_lba_32(cdb); 699 700 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 701 return TCM_UNSUPPORTED_SCSI_OPCODE; 702 703 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 704 cmd->execute_rw = ops->execute_rw; 705 cmd->execute_cmd = sbc_execute_rw; 706 break; 707 case READ_16: 708 sectors = transport_get_sectors_16(cdb); 709 cmd->t_task_lba = transport_lba_64(cdb); 710 711 if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 712 return TCM_UNSUPPORTED_SCSI_OPCODE; 713 714 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 715 cmd->execute_rw = ops->execute_rw; 716 cmd->execute_cmd = sbc_execute_rw; 717 break; 718 case WRITE_6: 719 sectors = transport_get_sectors_6(cdb); 720 cmd->t_task_lba = transport_lba_21(cdb); 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_10: 726 case WRITE_VERIFY: 727 sectors = transport_get_sectors_10(cdb); 728 cmd->t_task_lba = transport_lba_32(cdb); 729 730 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 731 return TCM_UNSUPPORTED_SCSI_OPCODE; 732 733 if (cdb[1] & 0x8) 734 cmd->se_cmd_flags |= SCF_FUA; 735 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 736 cmd->execute_rw = ops->execute_rw; 737 cmd->execute_cmd = sbc_execute_rw; 738 break; 739 case WRITE_12: 740 sectors = transport_get_sectors_12(cdb); 741 cmd->t_task_lba = transport_lba_32(cdb); 742 743 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 744 return TCM_UNSUPPORTED_SCSI_OPCODE; 745 746 if (cdb[1] & 0x8) 747 cmd->se_cmd_flags |= SCF_FUA; 748 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 749 cmd->execute_rw = ops->execute_rw; 750 cmd->execute_cmd = sbc_execute_rw; 751 break; 752 case WRITE_16: 753 sectors = transport_get_sectors_16(cdb); 754 cmd->t_task_lba = transport_lba_64(cdb); 755 756 if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 757 return TCM_UNSUPPORTED_SCSI_OPCODE; 758 759 if (cdb[1] & 0x8) 760 cmd->se_cmd_flags |= SCF_FUA; 761 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 762 cmd->execute_rw = ops->execute_rw; 763 cmd->execute_cmd = sbc_execute_rw; 764 break; 765 case XDWRITEREAD_10: 766 if (cmd->data_direction != DMA_TO_DEVICE || 767 !(cmd->se_cmd_flags & SCF_BIDI)) 768 return TCM_INVALID_CDB_FIELD; 769 sectors = transport_get_sectors_10(cdb); 770 771 cmd->t_task_lba = transport_lba_32(cdb); 772 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 773 774 /* 775 * Setup BIDI XOR callback to be run after I/O completion. 776 */ 777 cmd->execute_rw = ops->execute_rw; 778 cmd->execute_cmd = sbc_execute_rw; 779 cmd->transport_complete_callback = &xdreadwrite_callback; 780 if (cdb[1] & 0x8) 781 cmd->se_cmd_flags |= SCF_FUA; 782 break; 783 case VARIABLE_LENGTH_CMD: 784 { 785 u16 service_action = get_unaligned_be16(&cdb[8]); 786 switch (service_action) { 787 case XDWRITEREAD_32: 788 sectors = transport_get_sectors_32(cdb); 789 790 /* 791 * Use WRITE_32 and READ_32 opcodes for the emulated 792 * XDWRITE_READ_32 logic. 793 */ 794 cmd->t_task_lba = transport_lba_64_ext(cdb); 795 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 796 797 /* 798 * Setup BIDI XOR callback to be run during after I/O 799 * completion. 800 */ 801 cmd->execute_rw = ops->execute_rw; 802 cmd->execute_cmd = sbc_execute_rw; 803 cmd->transport_complete_callback = &xdreadwrite_callback; 804 if (cdb[1] & 0x8) 805 cmd->se_cmd_flags |= SCF_FUA; 806 break; 807 case WRITE_SAME_32: 808 sectors = transport_get_sectors_32(cdb); 809 if (!sectors) { 810 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 811 " supported\n"); 812 return TCM_INVALID_CDB_FIELD; 813 } 814 815 size = sbc_get_size(cmd, 1); 816 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 817 818 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 819 if (ret) 820 return ret; 821 break; 822 default: 823 pr_err("VARIABLE_LENGTH_CMD service action" 824 " 0x%04x not supported\n", service_action); 825 return TCM_UNSUPPORTED_SCSI_OPCODE; 826 } 827 break; 828 } 829 case COMPARE_AND_WRITE: 830 sectors = cdb[13]; 831 /* 832 * Currently enforce COMPARE_AND_WRITE for a single sector 833 */ 834 if (sectors > 1) { 835 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 836 " than 1\n", sectors); 837 return TCM_INVALID_CDB_FIELD; 838 } 839 /* 840 * Double size because we have two buffers, note that 841 * zero is not an error.. 842 */ 843 size = 2 * sbc_get_size(cmd, sectors); 844 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 845 cmd->t_task_nolb = sectors; 846 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 847 cmd->execute_rw = ops->execute_rw; 848 cmd->execute_cmd = sbc_compare_and_write; 849 cmd->transport_complete_callback = compare_and_write_callback; 850 break; 851 case READ_CAPACITY: 852 size = READ_CAP_LEN; 853 cmd->execute_cmd = sbc_emulate_readcapacity; 854 break; 855 case SERVICE_ACTION_IN: 856 switch (cmd->t_task_cdb[1] & 0x1f) { 857 case SAI_READ_CAPACITY_16: 858 cmd->execute_cmd = sbc_emulate_readcapacity_16; 859 break; 860 case SAI_REPORT_REFERRALS: 861 cmd->execute_cmd = target_emulate_report_referrals; 862 break; 863 default: 864 pr_err("Unsupported SA: 0x%02x\n", 865 cmd->t_task_cdb[1] & 0x1f); 866 return TCM_INVALID_CDB_FIELD; 867 } 868 size = (cdb[10] << 24) | (cdb[11] << 16) | 869 (cdb[12] << 8) | cdb[13]; 870 break; 871 case SYNCHRONIZE_CACHE: 872 case SYNCHRONIZE_CACHE_16: 873 if (cdb[0] == SYNCHRONIZE_CACHE) { 874 sectors = transport_get_sectors_10(cdb); 875 cmd->t_task_lba = transport_lba_32(cdb); 876 } else { 877 sectors = transport_get_sectors_16(cdb); 878 cmd->t_task_lba = transport_lba_64(cdb); 879 } 880 if (ops->execute_sync_cache) { 881 cmd->execute_cmd = ops->execute_sync_cache; 882 goto check_lba; 883 } 884 size = 0; 885 cmd->execute_cmd = sbc_emulate_noop; 886 break; 887 case UNMAP: 888 if (!ops->execute_unmap) 889 return TCM_UNSUPPORTED_SCSI_OPCODE; 890 891 size = get_unaligned_be16(&cdb[7]); 892 cmd->execute_cmd = ops->execute_unmap; 893 break; 894 case WRITE_SAME_16: 895 sectors = transport_get_sectors_16(cdb); 896 if (!sectors) { 897 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 898 return TCM_INVALID_CDB_FIELD; 899 } 900 901 size = sbc_get_size(cmd, 1); 902 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 903 904 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 905 if (ret) 906 return ret; 907 break; 908 case WRITE_SAME: 909 sectors = transport_get_sectors_10(cdb); 910 if (!sectors) { 911 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 912 return TCM_INVALID_CDB_FIELD; 913 } 914 915 size = sbc_get_size(cmd, 1); 916 cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 917 918 /* 919 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 920 * of byte 1 bit 3 UNMAP instead of original reserved field 921 */ 922 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 923 if (ret) 924 return ret; 925 break; 926 case VERIFY: 927 size = 0; 928 sectors = transport_get_sectors_10(cdb); 929 cmd->t_task_lba = transport_lba_32(cdb); 930 cmd->execute_cmd = sbc_emulate_noop; 931 goto check_lba; 932 case REZERO_UNIT: 933 case SEEK_6: 934 case SEEK_10: 935 /* 936 * There are still clients out there which use these old SCSI-2 937 * commands. This mainly happens when running VMs with legacy 938 * guest systems, connected via SCSI command pass-through to 939 * iSCSI targets. Make them happy and return status GOOD. 940 */ 941 size = 0; 942 cmd->execute_cmd = sbc_emulate_noop; 943 break; 944 default: 945 ret = spc_parse_cdb(cmd, &size); 946 if (ret) 947 return ret; 948 } 949 950 /* reject any command that we don't have a handler for */ 951 if (!cmd->execute_cmd) 952 return TCM_UNSUPPORTED_SCSI_OPCODE; 953 954 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 955 unsigned long long end_lba; 956 957 if (sectors > dev->dev_attrib.fabric_max_sectors) { 958 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 959 " big sectors %u exceeds fabric_max_sectors:" 960 " %u\n", cdb[0], sectors, 961 dev->dev_attrib.fabric_max_sectors); 962 return TCM_INVALID_CDB_FIELD; 963 } 964 if (sectors > dev->dev_attrib.hw_max_sectors) { 965 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 966 " big sectors %u exceeds backend hw_max_sectors:" 967 " %u\n", cdb[0], sectors, 968 dev->dev_attrib.hw_max_sectors); 969 return TCM_INVALID_CDB_FIELD; 970 } 971check_lba: 972 end_lba = dev->transport->get_blocks(dev) + 1; 973 if (cmd->t_task_lba + sectors > end_lba) { 974 pr_err("cmd exceeds last lba %llu " 975 "(lba %llu, sectors %u)\n", 976 end_lba, cmd->t_task_lba, sectors); 977 return TCM_ADDRESS_OUT_OF_RANGE; 978 } 979 980 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 981 size = sbc_get_size(cmd, sectors); 982 } 983 984 return target_cmd_size_check(cmd, size); 985} 986EXPORT_SYMBOL(sbc_parse_cdb); 987 988u32 sbc_get_device_type(struct se_device *dev) 989{ 990 return TYPE_DISK; 991} 992EXPORT_SYMBOL(sbc_get_device_type); 993 994sense_reason_t 995sbc_execute_unmap(struct se_cmd *cmd, 996 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, 997 sector_t, sector_t), 998 void *priv) 999{ 1000 struct se_device *dev = cmd->se_dev; 1001 unsigned char *buf, *ptr = NULL; 1002 sector_t lba; 1003 int size; 1004 u32 range; 1005 sense_reason_t ret = 0; 1006 int dl, bd_dl; 1007 1008 /* We never set ANC_SUP */ 1009 if (cmd->t_task_cdb[1]) 1010 return TCM_INVALID_CDB_FIELD; 1011 1012 if (cmd->data_length == 0) { 1013 target_complete_cmd(cmd, SAM_STAT_GOOD); 1014 return 0; 1015 } 1016 1017 if (cmd->data_length < 8) { 1018 pr_warn("UNMAP parameter list length %u too small\n", 1019 cmd->data_length); 1020 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1021 } 1022 1023 buf = transport_kmap_data_sg(cmd); 1024 if (!buf) 1025 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1026 1027 dl = get_unaligned_be16(&buf[0]); 1028 bd_dl = get_unaligned_be16(&buf[2]); 1029 1030 size = cmd->data_length - 8; 1031 if (bd_dl > size) 1032 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1033 cmd->data_length, bd_dl); 1034 else 1035 size = bd_dl; 1036 1037 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1038 ret = TCM_INVALID_PARAMETER_LIST; 1039 goto err; 1040 } 1041 1042 /* First UNMAP block descriptor starts at 8 byte offset */ 1043 ptr = &buf[8]; 1044 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1045 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1046 1047 while (size >= 16) { 1048 lba = get_unaligned_be64(&ptr[0]); 1049 range = get_unaligned_be32(&ptr[8]); 1050 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1051 (unsigned long long)lba, range); 1052 1053 if (range > dev->dev_attrib.max_unmap_lba_count) { 1054 ret = TCM_INVALID_PARAMETER_LIST; 1055 goto err; 1056 } 1057 1058 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1059 ret = TCM_ADDRESS_OUT_OF_RANGE; 1060 goto err; 1061 } 1062 1063 ret = do_unmap_fn(cmd, priv, lba, range); 1064 if (ret) 1065 goto err; 1066 1067 ptr += 16; 1068 size -= 16; 1069 } 1070 1071err: 1072 transport_kunmap_data_sg(cmd); 1073 if (!ret) 1074 target_complete_cmd(cmd, GOOD); 1075 return ret; 1076} 1077EXPORT_SYMBOL(sbc_execute_unmap); 1078 1079void 1080sbc_dif_generate(struct se_cmd *cmd) 1081{ 1082 struct se_device *dev = cmd->se_dev; 1083 struct se_dif_v1_tuple *sdt; 1084 struct scatterlist *dsg, *psg = cmd->t_prot_sg; 1085 sector_t sector = cmd->t_task_lba; 1086 void *daddr, *paddr; 1087 int i, j, offset = 0; 1088 1089 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1090 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1091 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1092 1093 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1094 1095 if (offset >= psg->length) { 1096 kunmap_atomic(paddr); 1097 psg = sg_next(psg); 1098 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1099 offset = 0; 1100 } 1101 1102 sdt = paddr + offset; 1103 sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, 1104 dev->dev_attrib.block_size)); 1105 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT) 1106 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 1107 sdt->app_tag = 0; 1108 1109 pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x" 1110 " app_tag: 0x%04x ref_tag: %u\n", 1111 (unsigned long long)sector, sdt->guard_tag, 1112 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1113 1114 sector++; 1115 offset += sizeof(struct se_dif_v1_tuple); 1116 } 1117 1118 kunmap_atomic(paddr); 1119 kunmap_atomic(daddr); 1120 } 1121} 1122 1123static sense_reason_t 1124sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, 1125 const void *p, sector_t sector, unsigned int ei_lba) 1126{ 1127 int block_size = dev->dev_attrib.block_size; 1128 __be16 csum; 1129 1130 csum = cpu_to_be16(crc_t10dif(p, block_size)); 1131 1132 if (sdt->guard_tag != csum) { 1133 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1134 " csum 0x%04x\n", (unsigned long long)sector, 1135 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1136 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1137 } 1138 1139 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && 1140 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1141 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1142 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1143 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1144 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1145 } 1146 1147 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && 1148 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1149 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1150 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1151 be32_to_cpu(sdt->ref_tag), ei_lba); 1152 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1153 } 1154 1155 return 0; 1156} 1157 1158static void 1159sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1160 struct scatterlist *sg, int sg_off) 1161{ 1162 struct se_device *dev = cmd->se_dev; 1163 struct scatterlist *psg; 1164 void *paddr, *addr; 1165 unsigned int i, len, left; 1166 unsigned int offset = sg_off; 1167 1168 left = sectors * dev->prot_length; 1169 1170 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1171 unsigned int psg_len, copied = 0; 1172 1173 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1174 psg_len = min(left, psg->length); 1175 while (psg_len) { 1176 len = min(psg_len, sg->length - offset); 1177 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1178 1179 if (read) 1180 memcpy(paddr + copied, addr, len); 1181 else 1182 memcpy(addr, paddr + copied, len); 1183 1184 left -= len; 1185 offset += len; 1186 copied += len; 1187 psg_len -= len; 1188 1189 if (offset >= sg->length) { 1190 sg = sg_next(sg); 1191 offset = 0; 1192 } 1193 kunmap_atomic(addr); 1194 } 1195 kunmap_atomic(paddr); 1196 } 1197} 1198 1199sense_reason_t 1200sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1201 unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1202{ 1203 struct se_device *dev = cmd->se_dev; 1204 struct se_dif_v1_tuple *sdt; 1205 struct scatterlist *dsg, *psg = cmd->t_prot_sg; 1206 sector_t sector = start; 1207 void *daddr, *paddr; 1208 int i, j, offset = 0; 1209 sense_reason_t rc; 1210 1211 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1212 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1213 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1214 1215 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1216 1217 if (offset >= psg->length) { 1218 kunmap_atomic(paddr); 1219 psg = sg_next(psg); 1220 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1221 offset = 0; 1222 } 1223 1224 sdt = paddr + offset; 1225 1226 pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" 1227 " app_tag: 0x%04x ref_tag: %u\n", 1228 (unsigned long long)sector, sdt->guard_tag, 1229 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1230 1231 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 1232 ei_lba); 1233 if (rc) { 1234 kunmap_atomic(paddr); 1235 kunmap_atomic(daddr); 1236 cmd->bad_sector = sector; 1237 return rc; 1238 } 1239 1240 sector++; 1241 ei_lba++; 1242 offset += sizeof(struct se_dif_v1_tuple); 1243 } 1244 1245 kunmap_atomic(paddr); 1246 kunmap_atomic(daddr); 1247 } 1248 sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); 1249 1250 return 0; 1251} 1252EXPORT_SYMBOL(sbc_dif_verify_write); 1253 1254static sense_reason_t 1255__sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1256 unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1257{ 1258 struct se_device *dev = cmd->se_dev; 1259 struct se_dif_v1_tuple *sdt; 1260 struct scatterlist *dsg, *psg = sg; 1261 sector_t sector = start; 1262 void *daddr, *paddr; 1263 int i, j, offset = sg_off; 1264 sense_reason_t rc; 1265 1266 for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 1267 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1268 paddr = kmap_atomic(sg_page(psg)) + sg->offset; 1269 1270 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 1271 1272 if (offset >= psg->length) { 1273 kunmap_atomic(paddr); 1274 psg = sg_next(psg); 1275 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1276 offset = 0; 1277 } 1278 1279 sdt = paddr + offset; 1280 1281 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1282 " app_tag: 0x%04x ref_tag: %u\n", 1283 (unsigned long long)sector, sdt->guard_tag, 1284 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1285 1286 if (sdt->app_tag == cpu_to_be16(0xffff)) { 1287 sector++; 1288 offset += sizeof(struct se_dif_v1_tuple); 1289 continue; 1290 } 1291 1292 rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 1293 ei_lba); 1294 if (rc) { 1295 kunmap_atomic(paddr); 1296 kunmap_atomic(daddr); 1297 cmd->bad_sector = sector; 1298 return rc; 1299 } 1300 1301 sector++; 1302 ei_lba++; 1303 offset += sizeof(struct se_dif_v1_tuple); 1304 } 1305 1306 kunmap_atomic(paddr); 1307 kunmap_atomic(daddr); 1308 } 1309 1310 return 0; 1311} 1312 1313sense_reason_t 1314sbc_dif_read_strip(struct se_cmd *cmd) 1315{ 1316 struct se_device *dev = cmd->se_dev; 1317 u32 sectors = cmd->prot_length / dev->prot_length; 1318 1319 return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, 1320 cmd->t_prot_sg, 0); 1321} 1322 1323sense_reason_t 1324sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1325 unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1326{ 1327 sense_reason_t rc; 1328 1329 rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); 1330 if (rc) 1331 return rc; 1332 1333 sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); 1334 return 0; 1335} 1336EXPORT_SYMBOL(sbc_dif_verify_read); 1337