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_proto.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_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); 41 static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); 42 43 static sense_reason_t 44 sbc_emulate_readcapacity(struct se_cmd *cmd) 45 { 46 struct se_device *dev = cmd->se_dev; 47 unsigned char *cdb = cmd->t_task_cdb; 48 unsigned long long blocks_long = dev->transport->get_blocks(dev); 49 unsigned char *rbuf; 50 unsigned char buf[8]; 51 u32 blocks; 52 53 /* 54 * SBC-2 says: 55 * If the PMI bit is set to zero and the LOGICAL BLOCK 56 * ADDRESS field is not set to zero, the device server shall 57 * terminate the command with CHECK CONDITION status with 58 * the sense key set to ILLEGAL REQUEST and the additional 59 * sense code set to INVALID FIELD IN CDB. 60 * 61 * In SBC-3, these fields are obsolete, but some SCSI 62 * compliance tests actually check this, so we might as well 63 * follow SBC-2. 64 */ 65 if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 66 return TCM_INVALID_CDB_FIELD; 67 68 if (blocks_long >= 0x00000000ffffffff) 69 blocks = 0xffffffff; 70 else 71 blocks = (u32)blocks_long; 72 73 buf[0] = (blocks >> 24) & 0xff; 74 buf[1] = (blocks >> 16) & 0xff; 75 buf[2] = (blocks >> 8) & 0xff; 76 buf[3] = blocks & 0xff; 77 buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; 78 buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; 79 buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; 80 buf[7] = dev->dev_attrib.block_size & 0xff; 81 82 rbuf = transport_kmap_data_sg(cmd); 83 if (rbuf) { 84 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 85 transport_kunmap_data_sg(cmd); 86 } 87 88 target_complete_cmd_with_length(cmd, GOOD, 8); 89 return 0; 90 } 91 92 static sense_reason_t 93 sbc_emulate_readcapacity_16(struct se_cmd *cmd) 94 { 95 struct se_device *dev = cmd->se_dev; 96 struct se_session *sess = cmd->se_sess; 97 int pi_prot_type = dev->dev_attrib.pi_prot_type; 98 99 unsigned char *rbuf; 100 unsigned char buf[32]; 101 unsigned long long blocks = dev->transport->get_blocks(dev); 102 103 memset(buf, 0, sizeof(buf)); 104 buf[0] = (blocks >> 56) & 0xff; 105 buf[1] = (blocks >> 48) & 0xff; 106 buf[2] = (blocks >> 40) & 0xff; 107 buf[3] = (blocks >> 32) & 0xff; 108 buf[4] = (blocks >> 24) & 0xff; 109 buf[5] = (blocks >> 16) & 0xff; 110 buf[6] = (blocks >> 8) & 0xff; 111 buf[7] = blocks & 0xff; 112 buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 113 buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 114 buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 115 buf[11] = dev->dev_attrib.block_size & 0xff; 116 /* 117 * Set P_TYPE and PROT_EN bits for DIF support 118 */ 119 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 120 /* 121 * Only override a device's pi_prot_type if no T10-PI is 122 * available, and sess_prot_type has been explicitly enabled. 123 */ 124 if (!pi_prot_type) 125 pi_prot_type = sess->sess_prot_type; 126 127 if (pi_prot_type) 128 buf[12] = (pi_prot_type - 1) << 1 | 0x1; 129 } 130 131 if (dev->transport->get_lbppbe) 132 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 133 134 if (dev->transport->get_alignment_offset_lbas) { 135 u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 136 buf[14] = (lalba >> 8) & 0x3f; 137 buf[15] = lalba & 0xff; 138 } 139 140 /* 141 * Set Thin Provisioning Enable bit following sbc3r22 in section 142 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 143 */ 144 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 145 buf[14] |= 0x80; 146 147 rbuf = transport_kmap_data_sg(cmd); 148 if (rbuf) { 149 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 150 transport_kunmap_data_sg(cmd); 151 } 152 153 target_complete_cmd_with_length(cmd, GOOD, 32); 154 return 0; 155 } 156 157 static sense_reason_t 158 sbc_emulate_startstop(struct se_cmd *cmd) 159 { 160 unsigned char *cdb = cmd->t_task_cdb; 161 162 /* 163 * See sbc3r36 section 5.25 164 * Immediate bit should be set since there is nothing to complete 165 * POWER CONDITION MODIFIER 0h 166 */ 167 if (!(cdb[1] & 1) || cdb[2] || cdb[3]) 168 return TCM_INVALID_CDB_FIELD; 169 170 /* 171 * See sbc3r36 section 5.25 172 * POWER CONDITION 0h START_VALID - process START and LOEJ 173 */ 174 if (cdb[4] >> 4 & 0xf) 175 return TCM_INVALID_CDB_FIELD; 176 177 /* 178 * See sbc3r36 section 5.25 179 * LOEJ 0h - nothing to load or unload 180 * START 1h - we are ready 181 */ 182 if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) 183 return TCM_INVALID_CDB_FIELD; 184 185 target_complete_cmd(cmd, SAM_STAT_GOOD); 186 return 0; 187 } 188 189 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 190 { 191 u32 num_blocks; 192 193 if (cmd->t_task_cdb[0] == WRITE_SAME) 194 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 195 else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 196 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 197 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 198 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 199 200 /* 201 * Use the explicit range when non zero is supplied, otherwise calculate 202 * the remaining range based on ->get_blocks() - starting LBA. 203 */ 204 if (num_blocks) 205 return num_blocks; 206 207 return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 208 cmd->t_task_lba + 1; 209 } 210 EXPORT_SYMBOL(sbc_get_write_same_sectors); 211 212 static sense_reason_t 213 sbc_execute_write_same_unmap(struct se_cmd *cmd) 214 { 215 struct sbc_ops *ops = cmd->protocol_data; 216 sector_t nolb = sbc_get_write_same_sectors(cmd); 217 sense_reason_t ret; 218 219 if (nolb) { 220 ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); 221 if (ret) 222 return ret; 223 } 224 225 target_complete_cmd(cmd, GOOD); 226 return 0; 227 } 228 229 static sense_reason_t 230 sbc_emulate_noop(struct se_cmd *cmd) 231 { 232 target_complete_cmd(cmd, GOOD); 233 return 0; 234 } 235 236 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 237 { 238 return cmd->se_dev->dev_attrib.block_size * sectors; 239 } 240 241 static inline u32 transport_get_sectors_6(unsigned char *cdb) 242 { 243 /* 244 * Use 8-bit sector value. SBC-3 says: 245 * 246 * A TRANSFER LENGTH field set to zero specifies that 256 247 * logical blocks shall be written. Any other value 248 * specifies the number of logical blocks that shall be 249 * written. 250 */ 251 return cdb[4] ? : 256; 252 } 253 254 static inline u32 transport_get_sectors_10(unsigned char *cdb) 255 { 256 return (u32)(cdb[7] << 8) + cdb[8]; 257 } 258 259 static inline u32 transport_get_sectors_12(unsigned char *cdb) 260 { 261 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 262 } 263 264 static inline u32 transport_get_sectors_16(unsigned char *cdb) 265 { 266 return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 267 (cdb[12] << 8) + cdb[13]; 268 } 269 270 /* 271 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 272 */ 273 static inline u32 transport_get_sectors_32(unsigned char *cdb) 274 { 275 return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 276 (cdb[30] << 8) + cdb[31]; 277 278 } 279 280 static inline u32 transport_lba_21(unsigned char *cdb) 281 { 282 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 283 } 284 285 static inline u32 transport_lba_32(unsigned char *cdb) 286 { 287 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 288 } 289 290 static inline unsigned long long transport_lba_64(unsigned char *cdb) 291 { 292 unsigned int __v1, __v2; 293 294 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 295 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 296 297 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 298 } 299 300 /* 301 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 302 */ 303 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 304 { 305 unsigned int __v1, __v2; 306 307 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 308 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 309 310 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 311 } 312 313 static sense_reason_t 314 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 315 { 316 struct se_device *dev = cmd->se_dev; 317 sector_t end_lba = dev->transport->get_blocks(dev) + 1; 318 unsigned int sectors = sbc_get_write_same_sectors(cmd); 319 sense_reason_t ret; 320 321 if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 322 pr_err("WRITE_SAME PBDATA and LBDATA" 323 " bits not supported for Block Discard" 324 " Emulation\n"); 325 return TCM_UNSUPPORTED_SCSI_OPCODE; 326 } 327 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 328 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 329 sectors, cmd->se_dev->dev_attrib.max_write_same_len); 330 return TCM_INVALID_CDB_FIELD; 331 } 332 /* 333 * Sanity check for LBA wrap and request past end of device. 334 */ 335 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 336 ((cmd->t_task_lba + sectors) > end_lba)) { 337 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 338 (unsigned long long)end_lba, cmd->t_task_lba, sectors); 339 return TCM_ADDRESS_OUT_OF_RANGE; 340 } 341 342 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 343 if (flags[0] & 0x10) { 344 pr_warn("WRITE SAME with ANCHOR not supported\n"); 345 return TCM_INVALID_CDB_FIELD; 346 } 347 /* 348 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 349 * translated into block discard requests within backend code. 350 */ 351 if (flags[0] & 0x08) { 352 if (!ops->execute_unmap) 353 return TCM_UNSUPPORTED_SCSI_OPCODE; 354 355 if (!dev->dev_attrib.emulate_tpws) { 356 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" 357 " has emulate_tpws disabled\n"); 358 return TCM_UNSUPPORTED_SCSI_OPCODE; 359 } 360 cmd->execute_cmd = sbc_execute_write_same_unmap; 361 return 0; 362 } 363 if (!ops->execute_write_same) 364 return TCM_UNSUPPORTED_SCSI_OPCODE; 365 366 ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); 367 if (ret) 368 return ret; 369 370 cmd->execute_cmd = ops->execute_write_same; 371 return 0; 372 } 373 374 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success) 375 { 376 unsigned char *buf, *addr; 377 struct scatterlist *sg; 378 unsigned int offset; 379 sense_reason_t ret = TCM_NO_SENSE; 380 int i, count; 381 /* 382 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 383 * 384 * 1) read the specified logical block(s); 385 * 2) transfer logical blocks from the data-out buffer; 386 * 3) XOR the logical blocks transferred from the data-out buffer with 387 * the logical blocks read, storing the resulting XOR data in a buffer; 388 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 389 * blocks transferred from the data-out buffer; and 390 * 5) transfer the resulting XOR data to the data-in buffer. 391 */ 392 buf = kmalloc(cmd->data_length, GFP_KERNEL); 393 if (!buf) { 394 pr_err("Unable to allocate xor_callback buf\n"); 395 return TCM_OUT_OF_RESOURCES; 396 } 397 /* 398 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 399 * into the locally allocated *buf 400 */ 401 sg_copy_to_buffer(cmd->t_data_sg, 402 cmd->t_data_nents, 403 buf, 404 cmd->data_length); 405 406 /* 407 * Now perform the XOR against the BIDI read memory located at 408 * cmd->t_mem_bidi_list 409 */ 410 411 offset = 0; 412 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 413 addr = kmap_atomic(sg_page(sg)); 414 if (!addr) { 415 ret = TCM_OUT_OF_RESOURCES; 416 goto out; 417 } 418 419 for (i = 0; i < sg->length; i++) 420 *(addr + sg->offset + i) ^= *(buf + offset + i); 421 422 offset += sg->length; 423 kunmap_atomic(addr); 424 } 425 426 out: 427 kfree(buf); 428 return ret; 429 } 430 431 static sense_reason_t 432 sbc_execute_rw(struct se_cmd *cmd) 433 { 434 struct sbc_ops *ops = cmd->protocol_data; 435 436 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 437 cmd->data_direction); 438 } 439 440 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success) 441 { 442 struct se_device *dev = cmd->se_dev; 443 444 /* 445 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 446 * within target_complete_ok_work() if the command was successfully 447 * sent to the backend driver. 448 */ 449 spin_lock_irq(&cmd->t_state_lock); 450 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 451 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 452 spin_unlock_irq(&cmd->t_state_lock); 453 454 /* 455 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 456 * before the original READ I/O submission. 457 */ 458 up(&dev->caw_sem); 459 460 return TCM_NO_SENSE; 461 } 462 463 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success) 464 { 465 struct se_device *dev = cmd->se_dev; 466 struct scatterlist *write_sg = NULL, *sg; 467 unsigned char *buf = NULL, *addr; 468 struct sg_mapping_iter m; 469 unsigned int offset = 0, len; 470 unsigned int nlbas = cmd->t_task_nolb; 471 unsigned int block_size = dev->dev_attrib.block_size; 472 unsigned int compare_len = (nlbas * block_size); 473 sense_reason_t ret = TCM_NO_SENSE; 474 int rc, i; 475 476 /* 477 * Handle early failure in transport_generic_request_failure(), 478 * which will not have taken ->caw_sem yet.. 479 */ 480 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 481 return TCM_NO_SENSE; 482 /* 483 * Handle special case for zero-length COMPARE_AND_WRITE 484 */ 485 if (!cmd->data_length) 486 goto out; 487 /* 488 * Immediately exit + release dev->caw_sem if command has already 489 * been failed with a non-zero SCSI status. 490 */ 491 if (cmd->scsi_status) { 492 pr_err("compare_and_write_callback: non zero scsi_status:" 493 " 0x%02x\n", cmd->scsi_status); 494 goto out; 495 } 496 497 buf = kzalloc(cmd->data_length, GFP_KERNEL); 498 if (!buf) { 499 pr_err("Unable to allocate compare_and_write buf\n"); 500 ret = TCM_OUT_OF_RESOURCES; 501 goto out; 502 } 503 504 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 505 GFP_KERNEL); 506 if (!write_sg) { 507 pr_err("Unable to allocate compare_and_write sg\n"); 508 ret = TCM_OUT_OF_RESOURCES; 509 goto out; 510 } 511 sg_init_table(write_sg, cmd->t_data_nents); 512 /* 513 * Setup verify and write data payloads from total NumberLBAs. 514 */ 515 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 516 cmd->data_length); 517 if (!rc) { 518 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 519 ret = TCM_OUT_OF_RESOURCES; 520 goto out; 521 } 522 /* 523 * Compare against SCSI READ payload against verify payload 524 */ 525 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 526 addr = (unsigned char *)kmap_atomic(sg_page(sg)); 527 if (!addr) { 528 ret = TCM_OUT_OF_RESOURCES; 529 goto out; 530 } 531 532 len = min(sg->length, compare_len); 533 534 if (memcmp(addr, buf + offset, len)) { 535 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 536 addr, buf + offset); 537 kunmap_atomic(addr); 538 goto miscompare; 539 } 540 kunmap_atomic(addr); 541 542 offset += len; 543 compare_len -= len; 544 if (!compare_len) 545 break; 546 } 547 548 i = 0; 549 len = cmd->t_task_nolb * block_size; 550 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 551 /* 552 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 553 */ 554 while (len) { 555 sg_miter_next(&m); 556 557 if (block_size < PAGE_SIZE) { 558 sg_set_page(&write_sg[i], m.page, block_size, 559 block_size); 560 } else { 561 sg_miter_next(&m); 562 sg_set_page(&write_sg[i], m.page, block_size, 563 0); 564 } 565 len -= block_size; 566 i++; 567 } 568 sg_miter_stop(&m); 569 /* 570 * Save the original SGL + nents values before updating to new 571 * assignments, to be released in transport_free_pages() -> 572 * transport_reset_sgl_orig() 573 */ 574 cmd->t_data_sg_orig = cmd->t_data_sg; 575 cmd->t_data_sg = write_sg; 576 cmd->t_data_nents_orig = cmd->t_data_nents; 577 cmd->t_data_nents = 1; 578 579 cmd->sam_task_attr = TCM_HEAD_TAG; 580 cmd->transport_complete_callback = compare_and_write_post; 581 /* 582 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 583 * for submitting the adjusted SGL to write instance user-data. 584 */ 585 cmd->execute_cmd = sbc_execute_rw; 586 587 spin_lock_irq(&cmd->t_state_lock); 588 cmd->t_state = TRANSPORT_PROCESSING; 589 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 590 spin_unlock_irq(&cmd->t_state_lock); 591 592 __target_execute_cmd(cmd); 593 594 kfree(buf); 595 return ret; 596 597 miscompare: 598 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 599 dev->transport->name); 600 ret = TCM_MISCOMPARE_VERIFY; 601 out: 602 /* 603 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 604 * sbc_compare_and_write() before the original READ I/O submission. 605 */ 606 up(&dev->caw_sem); 607 kfree(write_sg); 608 kfree(buf); 609 return ret; 610 } 611 612 static sense_reason_t 613 sbc_compare_and_write(struct se_cmd *cmd) 614 { 615 struct sbc_ops *ops = cmd->protocol_data; 616 struct se_device *dev = cmd->se_dev; 617 sense_reason_t ret; 618 int rc; 619 /* 620 * Submit the READ first for COMPARE_AND_WRITE to perform the 621 * comparision using SGLs at cmd->t_bidi_data_sg.. 622 */ 623 rc = down_interruptible(&dev->caw_sem); 624 if (rc != 0) { 625 cmd->transport_complete_callback = NULL; 626 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 627 } 628 /* 629 * Reset cmd->data_length to individual block_size in order to not 630 * confuse backend drivers that depend on this value matching the 631 * size of the I/O being submitted. 632 */ 633 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 634 635 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 636 DMA_FROM_DEVICE); 637 if (ret) { 638 cmd->transport_complete_callback = NULL; 639 up(&dev->caw_sem); 640 return ret; 641 } 642 /* 643 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 644 * upon MISCOMPARE, or in compare_and_write_done() upon completion 645 * of WRITE instance user-data. 646 */ 647 return TCM_NO_SENSE; 648 } 649 650 static int 651 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 652 bool is_write, struct se_cmd *cmd) 653 { 654 if (is_write) { 655 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 656 protect ? TARGET_PROT_DOUT_PASS : 657 TARGET_PROT_DOUT_INSERT; 658 switch (protect) { 659 case 0x0: 660 case 0x3: 661 cmd->prot_checks = 0; 662 break; 663 case 0x1: 664 case 0x5: 665 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 666 if (prot_type == TARGET_DIF_TYPE1_PROT) 667 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 668 break; 669 case 0x2: 670 if (prot_type == TARGET_DIF_TYPE1_PROT) 671 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 672 break; 673 case 0x4: 674 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 675 break; 676 default: 677 pr_err("Unsupported protect field %d\n", protect); 678 return -EINVAL; 679 } 680 } else { 681 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 682 protect ? TARGET_PROT_DIN_PASS : 683 TARGET_PROT_DIN_STRIP; 684 switch (protect) { 685 case 0x0: 686 case 0x1: 687 case 0x5: 688 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 689 if (prot_type == TARGET_DIF_TYPE1_PROT) 690 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 691 break; 692 case 0x2: 693 if (prot_type == TARGET_DIF_TYPE1_PROT) 694 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 695 break; 696 case 0x3: 697 cmd->prot_checks = 0; 698 break; 699 case 0x4: 700 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 701 break; 702 default: 703 pr_err("Unsupported protect field %d\n", protect); 704 return -EINVAL; 705 } 706 } 707 708 return 0; 709 } 710 711 static sense_reason_t 712 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 713 u32 sectors, bool is_write) 714 { 715 u8 protect = cdb[1] >> 5; 716 int sp_ops = cmd->se_sess->sup_prot_ops; 717 int pi_prot_type = dev->dev_attrib.pi_prot_type; 718 bool fabric_prot = false; 719 720 if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 721 if (unlikely(protect && 722 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 723 pr_err("CDB contains protect bit, but device + fabric does" 724 " not advertise PROTECT=1 feature bit\n"); 725 return TCM_INVALID_CDB_FIELD; 726 } 727 if (cmd->prot_pto) 728 return TCM_NO_SENSE; 729 } 730 731 switch (dev->dev_attrib.pi_prot_type) { 732 case TARGET_DIF_TYPE3_PROT: 733 cmd->reftag_seed = 0xffffffff; 734 break; 735 case TARGET_DIF_TYPE2_PROT: 736 if (protect) 737 return TCM_INVALID_CDB_FIELD; 738 739 cmd->reftag_seed = cmd->t_task_lba; 740 break; 741 case TARGET_DIF_TYPE1_PROT: 742 cmd->reftag_seed = cmd->t_task_lba; 743 break; 744 case TARGET_DIF_TYPE0_PROT: 745 /* 746 * See if the fabric supports T10-PI, and the session has been 747 * configured to allow export PROTECT=1 feature bit with backend 748 * devices that don't support T10-PI. 749 */ 750 fabric_prot = is_write ? 751 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 752 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 753 754 if (fabric_prot && cmd->se_sess->sess_prot_type) { 755 pi_prot_type = cmd->se_sess->sess_prot_type; 756 break; 757 } 758 if (!protect) 759 return TCM_NO_SENSE; 760 /* Fallthrough */ 761 default: 762 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 763 "PROTECT: 0x%02x\n", cdb[0], protect); 764 return TCM_INVALID_CDB_FIELD; 765 } 766 767 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 768 return TCM_INVALID_CDB_FIELD; 769 770 cmd->prot_type = pi_prot_type; 771 cmd->prot_length = dev->prot_length * sectors; 772 773 /** 774 * In case protection information exists over the wire 775 * we modify command data length to describe pure data. 776 * The actual transfer length is data length + protection 777 * length 778 **/ 779 if (protect) 780 cmd->data_length = sectors * dev->dev_attrib.block_size; 781 782 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 783 "prot_op=%d prot_checks=%d\n", 784 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 785 cmd->prot_op, cmd->prot_checks); 786 787 return TCM_NO_SENSE; 788 } 789 790 static int 791 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 792 { 793 if (cdb[1] & 0x10) { 794 /* see explanation in spc_emulate_modesense */ 795 if (!target_check_fua(dev)) { 796 pr_err("Got CDB: 0x%02x with DPO bit set, but device" 797 " does not advertise support for DPO\n", cdb[0]); 798 return -EINVAL; 799 } 800 } 801 if (cdb[1] & 0x8) { 802 if (!target_check_fua(dev)) { 803 pr_err("Got CDB: 0x%02x with FUA bit set, but device" 804 " does not advertise support for FUA write\n", 805 cdb[0]); 806 return -EINVAL; 807 } 808 cmd->se_cmd_flags |= SCF_FUA; 809 } 810 return 0; 811 } 812 813 sense_reason_t 814 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 815 { 816 struct se_device *dev = cmd->se_dev; 817 unsigned char *cdb = cmd->t_task_cdb; 818 unsigned int size; 819 u32 sectors = 0; 820 sense_reason_t ret; 821 822 cmd->protocol_data = ops; 823 824 switch (cdb[0]) { 825 case READ_6: 826 sectors = transport_get_sectors_6(cdb); 827 cmd->t_task_lba = transport_lba_21(cdb); 828 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 829 cmd->execute_cmd = sbc_execute_rw; 830 break; 831 case READ_10: 832 sectors = transport_get_sectors_10(cdb); 833 cmd->t_task_lba = transport_lba_32(cdb); 834 835 if (sbc_check_dpofua(dev, cmd, cdb)) 836 return TCM_INVALID_CDB_FIELD; 837 838 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 839 if (ret) 840 return ret; 841 842 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 843 cmd->execute_cmd = sbc_execute_rw; 844 break; 845 case READ_12: 846 sectors = transport_get_sectors_12(cdb); 847 cmd->t_task_lba = transport_lba_32(cdb); 848 849 if (sbc_check_dpofua(dev, cmd, cdb)) 850 return TCM_INVALID_CDB_FIELD; 851 852 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 853 if (ret) 854 return ret; 855 856 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 857 cmd->execute_cmd = sbc_execute_rw; 858 break; 859 case READ_16: 860 sectors = transport_get_sectors_16(cdb); 861 cmd->t_task_lba = transport_lba_64(cdb); 862 863 if (sbc_check_dpofua(dev, cmd, cdb)) 864 return TCM_INVALID_CDB_FIELD; 865 866 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 867 if (ret) 868 return ret; 869 870 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 871 cmd->execute_cmd = sbc_execute_rw; 872 break; 873 case WRITE_6: 874 sectors = transport_get_sectors_6(cdb); 875 cmd->t_task_lba = transport_lba_21(cdb); 876 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 877 cmd->execute_cmd = sbc_execute_rw; 878 break; 879 case WRITE_10: 880 case WRITE_VERIFY: 881 sectors = transport_get_sectors_10(cdb); 882 cmd->t_task_lba = transport_lba_32(cdb); 883 884 if (sbc_check_dpofua(dev, cmd, cdb)) 885 return TCM_INVALID_CDB_FIELD; 886 887 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 888 if (ret) 889 return ret; 890 891 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 892 cmd->execute_cmd = sbc_execute_rw; 893 break; 894 case WRITE_12: 895 sectors = transport_get_sectors_12(cdb); 896 cmd->t_task_lba = transport_lba_32(cdb); 897 898 if (sbc_check_dpofua(dev, cmd, cdb)) 899 return TCM_INVALID_CDB_FIELD; 900 901 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 902 if (ret) 903 return ret; 904 905 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 906 cmd->execute_cmd = sbc_execute_rw; 907 break; 908 case WRITE_16: 909 sectors = transport_get_sectors_16(cdb); 910 cmd->t_task_lba = transport_lba_64(cdb); 911 912 if (sbc_check_dpofua(dev, cmd, cdb)) 913 return TCM_INVALID_CDB_FIELD; 914 915 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 916 if (ret) 917 return ret; 918 919 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 920 cmd->execute_cmd = sbc_execute_rw; 921 break; 922 case XDWRITEREAD_10: 923 if (cmd->data_direction != DMA_TO_DEVICE || 924 !(cmd->se_cmd_flags & SCF_BIDI)) 925 return TCM_INVALID_CDB_FIELD; 926 sectors = transport_get_sectors_10(cdb); 927 928 if (sbc_check_dpofua(dev, cmd, cdb)) 929 return TCM_INVALID_CDB_FIELD; 930 931 cmd->t_task_lba = transport_lba_32(cdb); 932 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 933 934 /* 935 * Setup BIDI XOR callback to be run after I/O completion. 936 */ 937 cmd->execute_cmd = sbc_execute_rw; 938 cmd->transport_complete_callback = &xdreadwrite_callback; 939 break; 940 case VARIABLE_LENGTH_CMD: 941 { 942 u16 service_action = get_unaligned_be16(&cdb[8]); 943 switch (service_action) { 944 case XDWRITEREAD_32: 945 sectors = transport_get_sectors_32(cdb); 946 947 if (sbc_check_dpofua(dev, cmd, cdb)) 948 return TCM_INVALID_CDB_FIELD; 949 /* 950 * Use WRITE_32 and READ_32 opcodes for the emulated 951 * XDWRITE_READ_32 logic. 952 */ 953 cmd->t_task_lba = transport_lba_64_ext(cdb); 954 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 955 956 /* 957 * Setup BIDI XOR callback to be run during after I/O 958 * completion. 959 */ 960 cmd->execute_cmd = sbc_execute_rw; 961 cmd->transport_complete_callback = &xdreadwrite_callback; 962 break; 963 case WRITE_SAME_32: 964 sectors = transport_get_sectors_32(cdb); 965 if (!sectors) { 966 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 967 " supported\n"); 968 return TCM_INVALID_CDB_FIELD; 969 } 970 971 size = sbc_get_size(cmd, 1); 972 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 973 974 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 975 if (ret) 976 return ret; 977 break; 978 default: 979 pr_err("VARIABLE_LENGTH_CMD service action" 980 " 0x%04x not supported\n", service_action); 981 return TCM_UNSUPPORTED_SCSI_OPCODE; 982 } 983 break; 984 } 985 case COMPARE_AND_WRITE: 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 = (cdb[10] << 24) | (cdb[11] << 16) | 1027 (cdb[12] << 8) | cdb[13]; 1028 break; 1029 case SYNCHRONIZE_CACHE: 1030 case SYNCHRONIZE_CACHE_16: 1031 if (cdb[0] == SYNCHRONIZE_CACHE) { 1032 sectors = transport_get_sectors_10(cdb); 1033 cmd->t_task_lba = transport_lba_32(cdb); 1034 } else { 1035 sectors = transport_get_sectors_16(cdb); 1036 cmd->t_task_lba = transport_lba_64(cdb); 1037 } 1038 if (ops->execute_sync_cache) { 1039 cmd->execute_cmd = ops->execute_sync_cache; 1040 goto check_lba; 1041 } 1042 size = 0; 1043 cmd->execute_cmd = sbc_emulate_noop; 1044 break; 1045 case UNMAP: 1046 if (!ops->execute_unmap) 1047 return TCM_UNSUPPORTED_SCSI_OPCODE; 1048 1049 if (!dev->dev_attrib.emulate_tpu) { 1050 pr_err("Got UNMAP, but backend device has" 1051 " emulate_tpu disabled\n"); 1052 return TCM_UNSUPPORTED_SCSI_OPCODE; 1053 } 1054 size = get_unaligned_be16(&cdb[7]); 1055 cmd->execute_cmd = sbc_execute_unmap; 1056 break; 1057 case WRITE_SAME_16: 1058 sectors = transport_get_sectors_16(cdb); 1059 if (!sectors) { 1060 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1061 return TCM_INVALID_CDB_FIELD; 1062 } 1063 1064 size = sbc_get_size(cmd, 1); 1065 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1066 1067 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1068 if (ret) 1069 return ret; 1070 break; 1071 case WRITE_SAME: 1072 sectors = transport_get_sectors_10(cdb); 1073 if (!sectors) { 1074 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1075 return TCM_INVALID_CDB_FIELD; 1076 } 1077 1078 size = sbc_get_size(cmd, 1); 1079 cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1080 1081 /* 1082 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1083 * of byte 1 bit 3 UNMAP instead of original reserved field 1084 */ 1085 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1086 if (ret) 1087 return ret; 1088 break; 1089 case VERIFY: 1090 size = 0; 1091 sectors = transport_get_sectors_10(cdb); 1092 cmd->t_task_lba = transport_lba_32(cdb); 1093 cmd->execute_cmd = sbc_emulate_noop; 1094 goto check_lba; 1095 case REZERO_UNIT: 1096 case SEEK_6: 1097 case SEEK_10: 1098 /* 1099 * There are still clients out there which use these old SCSI-2 1100 * commands. This mainly happens when running VMs with legacy 1101 * guest systems, connected via SCSI command pass-through to 1102 * iSCSI targets. Make them happy and return status GOOD. 1103 */ 1104 size = 0; 1105 cmd->execute_cmd = sbc_emulate_noop; 1106 break; 1107 case START_STOP: 1108 size = 0; 1109 cmd->execute_cmd = sbc_emulate_startstop; 1110 break; 1111 default: 1112 ret = spc_parse_cdb(cmd, &size); 1113 if (ret) 1114 return ret; 1115 } 1116 1117 /* reject any command that we don't have a handler for */ 1118 if (!cmd->execute_cmd) 1119 return TCM_UNSUPPORTED_SCSI_OPCODE; 1120 1121 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 1122 unsigned long long end_lba; 1123 check_lba: 1124 end_lba = dev->transport->get_blocks(dev) + 1; 1125 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1126 ((cmd->t_task_lba + sectors) > end_lba)) { 1127 pr_err("cmd exceeds last lba %llu " 1128 "(lba %llu, sectors %u)\n", 1129 end_lba, cmd->t_task_lba, sectors); 1130 return TCM_ADDRESS_OUT_OF_RANGE; 1131 } 1132 1133 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 1134 size = sbc_get_size(cmd, sectors); 1135 } 1136 1137 return target_cmd_size_check(cmd, size); 1138 } 1139 EXPORT_SYMBOL(sbc_parse_cdb); 1140 1141 u32 sbc_get_device_type(struct se_device *dev) 1142 { 1143 return TYPE_DISK; 1144 } 1145 EXPORT_SYMBOL(sbc_get_device_type); 1146 1147 static sense_reason_t 1148 sbc_execute_unmap(struct se_cmd *cmd) 1149 { 1150 struct sbc_ops *ops = cmd->protocol_data; 1151 struct se_device *dev = cmd->se_dev; 1152 unsigned char *buf, *ptr = NULL; 1153 sector_t lba; 1154 int size; 1155 u32 range; 1156 sense_reason_t ret = 0; 1157 int dl, bd_dl; 1158 1159 /* We never set ANC_SUP */ 1160 if (cmd->t_task_cdb[1]) 1161 return TCM_INVALID_CDB_FIELD; 1162 1163 if (cmd->data_length == 0) { 1164 target_complete_cmd(cmd, SAM_STAT_GOOD); 1165 return 0; 1166 } 1167 1168 if (cmd->data_length < 8) { 1169 pr_warn("UNMAP parameter list length %u too small\n", 1170 cmd->data_length); 1171 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1172 } 1173 1174 buf = transport_kmap_data_sg(cmd); 1175 if (!buf) 1176 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1177 1178 dl = get_unaligned_be16(&buf[0]); 1179 bd_dl = get_unaligned_be16(&buf[2]); 1180 1181 size = cmd->data_length - 8; 1182 if (bd_dl > size) 1183 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1184 cmd->data_length, bd_dl); 1185 else 1186 size = bd_dl; 1187 1188 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1189 ret = TCM_INVALID_PARAMETER_LIST; 1190 goto err; 1191 } 1192 1193 /* First UNMAP block descriptor starts at 8 byte offset */ 1194 ptr = &buf[8]; 1195 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1196 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1197 1198 while (size >= 16) { 1199 lba = get_unaligned_be64(&ptr[0]); 1200 range = get_unaligned_be32(&ptr[8]); 1201 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1202 (unsigned long long)lba, range); 1203 1204 if (range > dev->dev_attrib.max_unmap_lba_count) { 1205 ret = TCM_INVALID_PARAMETER_LIST; 1206 goto err; 1207 } 1208 1209 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1210 ret = TCM_ADDRESS_OUT_OF_RANGE; 1211 goto err; 1212 } 1213 1214 ret = ops->execute_unmap(cmd, lba, range); 1215 if (ret) 1216 goto err; 1217 1218 ptr += 16; 1219 size -= 16; 1220 } 1221 1222 err: 1223 transport_kunmap_data_sg(cmd); 1224 if (!ret) 1225 target_complete_cmd(cmd, GOOD); 1226 return ret; 1227 } 1228 1229 void 1230 sbc_dif_generate(struct se_cmd *cmd) 1231 { 1232 struct se_device *dev = cmd->se_dev; 1233 struct t10_pi_tuple *sdt; 1234 struct scatterlist *dsg = cmd->t_data_sg, *psg; 1235 sector_t sector = cmd->t_task_lba; 1236 void *daddr, *paddr; 1237 int i, j, offset = 0; 1238 unsigned int block_size = dev->dev_attrib.block_size; 1239 1240 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1241 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1242 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1243 1244 for (j = 0; j < psg->length; 1245 j += sizeof(*sdt)) { 1246 __u16 crc; 1247 unsigned int avail; 1248 1249 if (offset >= dsg->length) { 1250 offset -= dsg->length; 1251 kunmap_atomic(daddr - dsg->offset); 1252 dsg = sg_next(dsg); 1253 if (!dsg) { 1254 kunmap_atomic(paddr - psg->offset); 1255 return; 1256 } 1257 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1258 } 1259 1260 sdt = paddr + j; 1261 avail = min(block_size, dsg->length - offset); 1262 crc = crc_t10dif(daddr + offset, avail); 1263 if (avail < block_size) { 1264 kunmap_atomic(daddr - dsg->offset); 1265 dsg = sg_next(dsg); 1266 if (!dsg) { 1267 kunmap_atomic(paddr - psg->offset); 1268 return; 1269 } 1270 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1271 offset = block_size - avail; 1272 crc = crc_t10dif_update(crc, daddr, offset); 1273 } else { 1274 offset += block_size; 1275 } 1276 1277 sdt->guard_tag = cpu_to_be16(crc); 1278 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 1279 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 1280 sdt->app_tag = 0; 1281 1282 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 1283 " app_tag: 0x%04x ref_tag: %u\n", 1284 (cmd->data_direction == DMA_TO_DEVICE) ? 1285 "WRITE" : "READ", (unsigned long long)sector, 1286 sdt->guard_tag, sdt->app_tag, 1287 be32_to_cpu(sdt->ref_tag)); 1288 1289 sector++; 1290 } 1291 1292 kunmap_atomic(daddr - dsg->offset); 1293 kunmap_atomic(paddr - psg->offset); 1294 } 1295 } 1296 1297 static sense_reason_t 1298 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, 1299 __u16 crc, sector_t sector, unsigned int ei_lba) 1300 { 1301 __be16 csum; 1302 1303 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1304 goto check_ref; 1305 1306 csum = cpu_to_be16(crc); 1307 1308 if (sdt->guard_tag != csum) { 1309 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1310 " csum 0x%04x\n", (unsigned long long)sector, 1311 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1312 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1313 } 1314 1315 check_ref: 1316 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1317 return 0; 1318 1319 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 1320 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1321 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1322 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1323 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1324 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1325 } 1326 1327 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 1328 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1329 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1330 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1331 be32_to_cpu(sdt->ref_tag), ei_lba); 1332 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1333 } 1334 1335 return 0; 1336 } 1337 1338 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1339 struct scatterlist *sg, int sg_off) 1340 { 1341 struct se_device *dev = cmd->se_dev; 1342 struct scatterlist *psg; 1343 void *paddr, *addr; 1344 unsigned int i, len, left; 1345 unsigned int offset = sg_off; 1346 1347 if (!sg) 1348 return; 1349 1350 left = sectors * dev->prot_length; 1351 1352 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1353 unsigned int psg_len, copied = 0; 1354 1355 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1356 psg_len = min(left, psg->length); 1357 while (psg_len) { 1358 len = min(psg_len, sg->length - offset); 1359 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1360 1361 if (read) 1362 memcpy(paddr + copied, addr, len); 1363 else 1364 memcpy(addr, paddr + copied, len); 1365 1366 left -= len; 1367 offset += len; 1368 copied += len; 1369 psg_len -= len; 1370 1371 kunmap_atomic(addr - sg->offset - offset); 1372 1373 if (offset >= sg->length) { 1374 sg = sg_next(sg); 1375 offset = 0; 1376 } 1377 } 1378 kunmap_atomic(paddr - psg->offset); 1379 } 1380 } 1381 EXPORT_SYMBOL(sbc_dif_copy_prot); 1382 1383 sense_reason_t 1384 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1385 unsigned int ei_lba, struct scatterlist *psg, int psg_off) 1386 { 1387 struct se_device *dev = cmd->se_dev; 1388 struct t10_pi_tuple *sdt; 1389 struct scatterlist *dsg = cmd->t_data_sg; 1390 sector_t sector = start; 1391 void *daddr, *paddr; 1392 int i; 1393 sense_reason_t rc; 1394 int dsg_off = 0; 1395 unsigned int block_size = dev->dev_attrib.block_size; 1396 1397 for (; psg && sector < start + sectors; psg = sg_next(psg)) { 1398 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1399 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1400 1401 for (i = psg_off; i < psg->length && 1402 sector < start + sectors; 1403 i += sizeof(*sdt)) { 1404 __u16 crc; 1405 unsigned int avail; 1406 1407 if (dsg_off >= dsg->length) { 1408 dsg_off -= dsg->length; 1409 kunmap_atomic(daddr - dsg->offset); 1410 dsg = sg_next(dsg); 1411 if (!dsg) { 1412 kunmap_atomic(paddr - psg->offset); 1413 return 0; 1414 } 1415 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1416 } 1417 1418 sdt = paddr + i; 1419 1420 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1421 " app_tag: 0x%04x ref_tag: %u\n", 1422 (unsigned long long)sector, sdt->guard_tag, 1423 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1424 1425 if (sdt->app_tag == cpu_to_be16(0xffff)) { 1426 dsg_off += block_size; 1427 goto next; 1428 } 1429 1430 avail = min(block_size, dsg->length - dsg_off); 1431 crc = crc_t10dif(daddr + dsg_off, avail); 1432 if (avail < block_size) { 1433 kunmap_atomic(daddr - dsg->offset); 1434 dsg = sg_next(dsg); 1435 if (!dsg) { 1436 kunmap_atomic(paddr - psg->offset); 1437 return 0; 1438 } 1439 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1440 dsg_off = block_size - avail; 1441 crc = crc_t10dif_update(crc, daddr, dsg_off); 1442 } else { 1443 dsg_off += block_size; 1444 } 1445 1446 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 1447 if (rc) { 1448 kunmap_atomic(daddr - dsg->offset); 1449 kunmap_atomic(paddr - psg->offset); 1450 cmd->bad_sector = sector; 1451 return rc; 1452 } 1453 next: 1454 sector++; 1455 ei_lba++; 1456 } 1457 1458 psg_off = 0; 1459 kunmap_atomic(daddr - dsg->offset); 1460 kunmap_atomic(paddr - psg->offset); 1461 } 1462 1463 return 0; 1464 } 1465 EXPORT_SYMBOL(sbc_dif_verify); 1466