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 int *post_ret) 376 { 377 unsigned char *buf, *addr; 378 struct scatterlist *sg; 379 unsigned int offset; 380 sense_reason_t ret = TCM_NO_SENSE; 381 int i, count; 382 /* 383 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 384 * 385 * 1) read the specified logical block(s); 386 * 2) transfer logical blocks from the data-out buffer; 387 * 3) XOR the logical blocks transferred from the data-out buffer with 388 * the logical blocks read, storing the resulting XOR data in a buffer; 389 * 4) if the DISABLE WRITE bit is set to zero, then write the logical 390 * blocks transferred from the data-out buffer; and 391 * 5) transfer the resulting XOR data to the data-in buffer. 392 */ 393 buf = kmalloc(cmd->data_length, GFP_KERNEL); 394 if (!buf) { 395 pr_err("Unable to allocate xor_callback buf\n"); 396 return TCM_OUT_OF_RESOURCES; 397 } 398 /* 399 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 400 * into the locally allocated *buf 401 */ 402 sg_copy_to_buffer(cmd->t_data_sg, 403 cmd->t_data_nents, 404 buf, 405 cmd->data_length); 406 407 /* 408 * Now perform the XOR against the BIDI read memory located at 409 * cmd->t_mem_bidi_list 410 */ 411 412 offset = 0; 413 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 414 addr = kmap_atomic(sg_page(sg)); 415 if (!addr) { 416 ret = TCM_OUT_OF_RESOURCES; 417 goto out; 418 } 419 420 for (i = 0; i < sg->length; i++) 421 *(addr + sg->offset + i) ^= *(buf + offset + i); 422 423 offset += sg->length; 424 kunmap_atomic(addr); 425 } 426 427 out: 428 kfree(buf); 429 return ret; 430 } 431 432 static sense_reason_t 433 sbc_execute_rw(struct se_cmd *cmd) 434 { 435 struct sbc_ops *ops = cmd->protocol_data; 436 437 return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 438 cmd->data_direction); 439 } 440 441 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, 442 int *post_ret) 443 { 444 struct se_device *dev = cmd->se_dev; 445 446 /* 447 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 448 * within target_complete_ok_work() if the command was successfully 449 * sent to the backend driver. 450 */ 451 spin_lock_irq(&cmd->t_state_lock); 452 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) { 453 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 454 *post_ret = 1; 455 } 456 spin_unlock_irq(&cmd->t_state_lock); 457 458 /* 459 * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 460 * before the original READ I/O submission. 461 */ 462 up(&dev->caw_sem); 463 464 return TCM_NO_SENSE; 465 } 466 467 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, 468 int *post_ret) 469 { 470 struct se_device *dev = cmd->se_dev; 471 struct scatterlist *write_sg = NULL, *sg; 472 unsigned char *buf = NULL, *addr; 473 struct sg_mapping_iter m; 474 unsigned int offset = 0, len; 475 unsigned int nlbas = cmd->t_task_nolb; 476 unsigned int block_size = dev->dev_attrib.block_size; 477 unsigned int compare_len = (nlbas * block_size); 478 sense_reason_t ret = TCM_NO_SENSE; 479 int rc, i; 480 481 /* 482 * Handle early failure in transport_generic_request_failure(), 483 * which will not have taken ->caw_sem yet.. 484 */ 485 if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 486 return TCM_NO_SENSE; 487 /* 488 * Handle special case for zero-length COMPARE_AND_WRITE 489 */ 490 if (!cmd->data_length) 491 goto out; 492 /* 493 * Immediately exit + release dev->caw_sem if command has already 494 * been failed with a non-zero SCSI status. 495 */ 496 if (cmd->scsi_status) { 497 pr_err("compare_and_write_callback: non zero scsi_status:" 498 " 0x%02x\n", cmd->scsi_status); 499 goto out; 500 } 501 502 buf = kzalloc(cmd->data_length, GFP_KERNEL); 503 if (!buf) { 504 pr_err("Unable to allocate compare_and_write buf\n"); 505 ret = TCM_OUT_OF_RESOURCES; 506 goto out; 507 } 508 509 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 510 GFP_KERNEL); 511 if (!write_sg) { 512 pr_err("Unable to allocate compare_and_write sg\n"); 513 ret = TCM_OUT_OF_RESOURCES; 514 goto out; 515 } 516 sg_init_table(write_sg, cmd->t_data_nents); 517 /* 518 * Setup verify and write data payloads from total NumberLBAs. 519 */ 520 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 521 cmd->data_length); 522 if (!rc) { 523 pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 524 ret = TCM_OUT_OF_RESOURCES; 525 goto out; 526 } 527 /* 528 * Compare against SCSI READ payload against verify payload 529 */ 530 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 531 addr = (unsigned char *)kmap_atomic(sg_page(sg)); 532 if (!addr) { 533 ret = TCM_OUT_OF_RESOURCES; 534 goto out; 535 } 536 537 len = min(sg->length, compare_len); 538 539 if (memcmp(addr, buf + offset, len)) { 540 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 541 addr, buf + offset); 542 kunmap_atomic(addr); 543 goto miscompare; 544 } 545 kunmap_atomic(addr); 546 547 offset += len; 548 compare_len -= len; 549 if (!compare_len) 550 break; 551 } 552 553 i = 0; 554 len = cmd->t_task_nolb * block_size; 555 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 556 /* 557 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 558 */ 559 while (len) { 560 sg_miter_next(&m); 561 562 if (block_size < PAGE_SIZE) { 563 sg_set_page(&write_sg[i], m.page, block_size, 564 m.piter.sg->offset + block_size); 565 } else { 566 sg_miter_next(&m); 567 sg_set_page(&write_sg[i], m.page, block_size, 568 m.piter.sg->offset); 569 } 570 len -= block_size; 571 i++; 572 } 573 sg_miter_stop(&m); 574 /* 575 * Save the original SGL + nents values before updating to new 576 * assignments, to be released in transport_free_pages() -> 577 * transport_reset_sgl_orig() 578 */ 579 cmd->t_data_sg_orig = cmd->t_data_sg; 580 cmd->t_data_sg = write_sg; 581 cmd->t_data_nents_orig = cmd->t_data_nents; 582 cmd->t_data_nents = 1; 583 584 cmd->sam_task_attr = TCM_HEAD_TAG; 585 cmd->transport_complete_callback = compare_and_write_post; 586 /* 587 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 588 * for submitting the adjusted SGL to write instance user-data. 589 */ 590 cmd->execute_cmd = sbc_execute_rw; 591 592 spin_lock_irq(&cmd->t_state_lock); 593 cmd->t_state = TRANSPORT_PROCESSING; 594 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 595 spin_unlock_irq(&cmd->t_state_lock); 596 597 __target_execute_cmd(cmd); 598 599 kfree(buf); 600 return ret; 601 602 miscompare: 603 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 604 dev->transport->name); 605 ret = TCM_MISCOMPARE_VERIFY; 606 out: 607 /* 608 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 609 * sbc_compare_and_write() before the original READ I/O submission. 610 */ 611 up(&dev->caw_sem); 612 kfree(write_sg); 613 kfree(buf); 614 return ret; 615 } 616 617 static sense_reason_t 618 sbc_compare_and_write(struct se_cmd *cmd) 619 { 620 struct sbc_ops *ops = cmd->protocol_data; 621 struct se_device *dev = cmd->se_dev; 622 sense_reason_t ret; 623 int rc; 624 /* 625 * Submit the READ first for COMPARE_AND_WRITE to perform the 626 * comparision using SGLs at cmd->t_bidi_data_sg.. 627 */ 628 rc = down_interruptible(&dev->caw_sem); 629 if (rc != 0) { 630 cmd->transport_complete_callback = NULL; 631 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 632 } 633 /* 634 * Reset cmd->data_length to individual block_size in order to not 635 * confuse backend drivers that depend on this value matching the 636 * size of the I/O being submitted. 637 */ 638 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 639 640 ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 641 DMA_FROM_DEVICE); 642 if (ret) { 643 cmd->transport_complete_callback = NULL; 644 up(&dev->caw_sem); 645 return ret; 646 } 647 /* 648 * Unlock of dev->caw_sem to occur in compare_and_write_callback() 649 * upon MISCOMPARE, or in compare_and_write_done() upon completion 650 * of WRITE instance user-data. 651 */ 652 return TCM_NO_SENSE; 653 } 654 655 static int 656 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 657 bool is_write, struct se_cmd *cmd) 658 { 659 if (is_write) { 660 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 661 protect ? TARGET_PROT_DOUT_PASS : 662 TARGET_PROT_DOUT_INSERT; 663 switch (protect) { 664 case 0x0: 665 case 0x3: 666 cmd->prot_checks = 0; 667 break; 668 case 0x1: 669 case 0x5: 670 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 671 if (prot_type == TARGET_DIF_TYPE1_PROT) 672 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 673 break; 674 case 0x2: 675 if (prot_type == TARGET_DIF_TYPE1_PROT) 676 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 677 break; 678 case 0x4: 679 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 680 break; 681 default: 682 pr_err("Unsupported protect field %d\n", protect); 683 return -EINVAL; 684 } 685 } else { 686 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 687 protect ? TARGET_PROT_DIN_PASS : 688 TARGET_PROT_DIN_STRIP; 689 switch (protect) { 690 case 0x0: 691 case 0x1: 692 case 0x5: 693 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 694 if (prot_type == TARGET_DIF_TYPE1_PROT) 695 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 696 break; 697 case 0x2: 698 if (prot_type == TARGET_DIF_TYPE1_PROT) 699 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 700 break; 701 case 0x3: 702 cmd->prot_checks = 0; 703 break; 704 case 0x4: 705 cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 706 break; 707 default: 708 pr_err("Unsupported protect field %d\n", protect); 709 return -EINVAL; 710 } 711 } 712 713 return 0; 714 } 715 716 static sense_reason_t 717 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 718 u32 sectors, bool is_write) 719 { 720 u8 protect = cdb[1] >> 5; 721 int sp_ops = cmd->se_sess->sup_prot_ops; 722 int pi_prot_type = dev->dev_attrib.pi_prot_type; 723 bool fabric_prot = false; 724 725 if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 726 if (unlikely(protect && 727 !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 728 pr_err("CDB contains protect bit, but device + fabric does" 729 " not advertise PROTECT=1 feature bit\n"); 730 return TCM_INVALID_CDB_FIELD; 731 } 732 if (cmd->prot_pto) 733 return TCM_NO_SENSE; 734 } 735 736 switch (dev->dev_attrib.pi_prot_type) { 737 case TARGET_DIF_TYPE3_PROT: 738 cmd->reftag_seed = 0xffffffff; 739 break; 740 case TARGET_DIF_TYPE2_PROT: 741 if (protect) 742 return TCM_INVALID_CDB_FIELD; 743 744 cmd->reftag_seed = cmd->t_task_lba; 745 break; 746 case TARGET_DIF_TYPE1_PROT: 747 cmd->reftag_seed = cmd->t_task_lba; 748 break; 749 case TARGET_DIF_TYPE0_PROT: 750 /* 751 * See if the fabric supports T10-PI, and the session has been 752 * configured to allow export PROTECT=1 feature bit with backend 753 * devices that don't support T10-PI. 754 */ 755 fabric_prot = is_write ? 756 !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 757 !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 758 759 if (fabric_prot && cmd->se_sess->sess_prot_type) { 760 pi_prot_type = cmd->se_sess->sess_prot_type; 761 break; 762 } 763 if (!protect) 764 return TCM_NO_SENSE; 765 /* Fallthrough */ 766 default: 767 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 768 "PROTECT: 0x%02x\n", cdb[0], protect); 769 return TCM_INVALID_CDB_FIELD; 770 } 771 772 if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 773 return TCM_INVALID_CDB_FIELD; 774 775 cmd->prot_type = pi_prot_type; 776 cmd->prot_length = dev->prot_length * sectors; 777 778 /** 779 * In case protection information exists over the wire 780 * we modify command data length to describe pure data. 781 * The actual transfer length is data length + protection 782 * length 783 **/ 784 if (protect) 785 cmd->data_length = sectors * dev->dev_attrib.block_size; 786 787 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 788 "prot_op=%d prot_checks=%d\n", 789 __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 790 cmd->prot_op, cmd->prot_checks); 791 792 return TCM_NO_SENSE; 793 } 794 795 static int 796 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 797 { 798 if (cdb[1] & 0x10) { 799 /* see explanation in spc_emulate_modesense */ 800 if (!target_check_fua(dev)) { 801 pr_err("Got CDB: 0x%02x with DPO bit set, but device" 802 " does not advertise support for DPO\n", cdb[0]); 803 return -EINVAL; 804 } 805 } 806 if (cdb[1] & 0x8) { 807 if (!target_check_fua(dev)) { 808 pr_err("Got CDB: 0x%02x with FUA bit set, but device" 809 " does not advertise support for FUA write\n", 810 cdb[0]); 811 return -EINVAL; 812 } 813 cmd->se_cmd_flags |= SCF_FUA; 814 } 815 return 0; 816 } 817 818 sense_reason_t 819 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 820 { 821 struct se_device *dev = cmd->se_dev; 822 unsigned char *cdb = cmd->t_task_cdb; 823 unsigned int size; 824 u32 sectors = 0; 825 sense_reason_t ret; 826 827 cmd->protocol_data = ops; 828 829 switch (cdb[0]) { 830 case READ_6: 831 sectors = transport_get_sectors_6(cdb); 832 cmd->t_task_lba = transport_lba_21(cdb); 833 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 834 cmd->execute_cmd = sbc_execute_rw; 835 break; 836 case READ_10: 837 sectors = transport_get_sectors_10(cdb); 838 cmd->t_task_lba = transport_lba_32(cdb); 839 840 if (sbc_check_dpofua(dev, cmd, cdb)) 841 return TCM_INVALID_CDB_FIELD; 842 843 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 844 if (ret) 845 return ret; 846 847 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 848 cmd->execute_cmd = sbc_execute_rw; 849 break; 850 case READ_12: 851 sectors = transport_get_sectors_12(cdb); 852 cmd->t_task_lba = transport_lba_32(cdb); 853 854 if (sbc_check_dpofua(dev, cmd, cdb)) 855 return TCM_INVALID_CDB_FIELD; 856 857 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 858 if (ret) 859 return ret; 860 861 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 862 cmd->execute_cmd = sbc_execute_rw; 863 break; 864 case READ_16: 865 sectors = transport_get_sectors_16(cdb); 866 cmd->t_task_lba = transport_lba_64(cdb); 867 868 if (sbc_check_dpofua(dev, cmd, cdb)) 869 return TCM_INVALID_CDB_FIELD; 870 871 ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 872 if (ret) 873 return ret; 874 875 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 876 cmd->execute_cmd = sbc_execute_rw; 877 break; 878 case WRITE_6: 879 sectors = transport_get_sectors_6(cdb); 880 cmd->t_task_lba = transport_lba_21(cdb); 881 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 882 cmd->execute_cmd = sbc_execute_rw; 883 break; 884 case WRITE_10: 885 case WRITE_VERIFY: 886 sectors = transport_get_sectors_10(cdb); 887 cmd->t_task_lba = transport_lba_32(cdb); 888 889 if (sbc_check_dpofua(dev, cmd, cdb)) 890 return TCM_INVALID_CDB_FIELD; 891 892 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 893 if (ret) 894 return ret; 895 896 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 897 cmd->execute_cmd = sbc_execute_rw; 898 break; 899 case WRITE_12: 900 sectors = transport_get_sectors_12(cdb); 901 cmd->t_task_lba = transport_lba_32(cdb); 902 903 if (sbc_check_dpofua(dev, cmd, cdb)) 904 return TCM_INVALID_CDB_FIELD; 905 906 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 907 if (ret) 908 return ret; 909 910 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 911 cmd->execute_cmd = sbc_execute_rw; 912 break; 913 case WRITE_16: 914 sectors = transport_get_sectors_16(cdb); 915 cmd->t_task_lba = transport_lba_64(cdb); 916 917 if (sbc_check_dpofua(dev, cmd, cdb)) 918 return TCM_INVALID_CDB_FIELD; 919 920 ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 921 if (ret) 922 return ret; 923 924 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 925 cmd->execute_cmd = sbc_execute_rw; 926 break; 927 case XDWRITEREAD_10: 928 if (cmd->data_direction != DMA_TO_DEVICE || 929 !(cmd->se_cmd_flags & SCF_BIDI)) 930 return TCM_INVALID_CDB_FIELD; 931 sectors = transport_get_sectors_10(cdb); 932 933 if (sbc_check_dpofua(dev, cmd, cdb)) 934 return TCM_INVALID_CDB_FIELD; 935 936 cmd->t_task_lba = transport_lba_32(cdb); 937 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 938 939 /* 940 * Setup BIDI XOR callback to be run after I/O completion. 941 */ 942 cmd->execute_cmd = sbc_execute_rw; 943 cmd->transport_complete_callback = &xdreadwrite_callback; 944 break; 945 case VARIABLE_LENGTH_CMD: 946 { 947 u16 service_action = get_unaligned_be16(&cdb[8]); 948 switch (service_action) { 949 case XDWRITEREAD_32: 950 sectors = transport_get_sectors_32(cdb); 951 952 if (sbc_check_dpofua(dev, cmd, cdb)) 953 return TCM_INVALID_CDB_FIELD; 954 /* 955 * Use WRITE_32 and READ_32 opcodes for the emulated 956 * XDWRITE_READ_32 logic. 957 */ 958 cmd->t_task_lba = transport_lba_64_ext(cdb); 959 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 960 961 /* 962 * Setup BIDI XOR callback to be run during after I/O 963 * completion. 964 */ 965 cmd->execute_cmd = sbc_execute_rw; 966 cmd->transport_complete_callback = &xdreadwrite_callback; 967 break; 968 case WRITE_SAME_32: 969 sectors = transport_get_sectors_32(cdb); 970 if (!sectors) { 971 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 972 " supported\n"); 973 return TCM_INVALID_CDB_FIELD; 974 } 975 976 size = sbc_get_size(cmd, 1); 977 cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 978 979 ret = sbc_setup_write_same(cmd, &cdb[10], ops); 980 if (ret) 981 return ret; 982 break; 983 default: 984 pr_err("VARIABLE_LENGTH_CMD service action" 985 " 0x%04x not supported\n", service_action); 986 return TCM_UNSUPPORTED_SCSI_OPCODE; 987 } 988 break; 989 } 990 case COMPARE_AND_WRITE: 991 sectors = cdb[13]; 992 /* 993 * Currently enforce COMPARE_AND_WRITE for a single sector 994 */ 995 if (sectors > 1) { 996 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 997 " than 1\n", sectors); 998 return TCM_INVALID_CDB_FIELD; 999 } 1000 if (sbc_check_dpofua(dev, cmd, cdb)) 1001 return TCM_INVALID_CDB_FIELD; 1002 1003 /* 1004 * Double size because we have two buffers, note that 1005 * zero is not an error.. 1006 */ 1007 size = 2 * sbc_get_size(cmd, sectors); 1008 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1009 cmd->t_task_nolb = sectors; 1010 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 1011 cmd->execute_cmd = sbc_compare_and_write; 1012 cmd->transport_complete_callback = compare_and_write_callback; 1013 break; 1014 case READ_CAPACITY: 1015 size = READ_CAP_LEN; 1016 cmd->execute_cmd = sbc_emulate_readcapacity; 1017 break; 1018 case SERVICE_ACTION_IN_16: 1019 switch (cmd->t_task_cdb[1] & 0x1f) { 1020 case SAI_READ_CAPACITY_16: 1021 cmd->execute_cmd = sbc_emulate_readcapacity_16; 1022 break; 1023 case SAI_REPORT_REFERRALS: 1024 cmd->execute_cmd = target_emulate_report_referrals; 1025 break; 1026 default: 1027 pr_err("Unsupported SA: 0x%02x\n", 1028 cmd->t_task_cdb[1] & 0x1f); 1029 return TCM_INVALID_CDB_FIELD; 1030 } 1031 size = (cdb[10] << 24) | (cdb[11] << 16) | 1032 (cdb[12] << 8) | cdb[13]; 1033 break; 1034 case SYNCHRONIZE_CACHE: 1035 case SYNCHRONIZE_CACHE_16: 1036 if (cdb[0] == SYNCHRONIZE_CACHE) { 1037 sectors = transport_get_sectors_10(cdb); 1038 cmd->t_task_lba = transport_lba_32(cdb); 1039 } else { 1040 sectors = transport_get_sectors_16(cdb); 1041 cmd->t_task_lba = transport_lba_64(cdb); 1042 } 1043 if (ops->execute_sync_cache) { 1044 cmd->execute_cmd = ops->execute_sync_cache; 1045 goto check_lba; 1046 } 1047 size = 0; 1048 cmd->execute_cmd = sbc_emulate_noop; 1049 break; 1050 case UNMAP: 1051 if (!ops->execute_unmap) 1052 return TCM_UNSUPPORTED_SCSI_OPCODE; 1053 1054 if (!dev->dev_attrib.emulate_tpu) { 1055 pr_err("Got UNMAP, but backend device has" 1056 " emulate_tpu disabled\n"); 1057 return TCM_UNSUPPORTED_SCSI_OPCODE; 1058 } 1059 size = get_unaligned_be16(&cdb[7]); 1060 cmd->execute_cmd = sbc_execute_unmap; 1061 break; 1062 case WRITE_SAME_16: 1063 sectors = transport_get_sectors_16(cdb); 1064 if (!sectors) { 1065 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1066 return TCM_INVALID_CDB_FIELD; 1067 } 1068 1069 size = sbc_get_size(cmd, 1); 1070 cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1071 1072 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1073 if (ret) 1074 return ret; 1075 break; 1076 case WRITE_SAME: 1077 sectors = transport_get_sectors_10(cdb); 1078 if (!sectors) { 1079 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1080 return TCM_INVALID_CDB_FIELD; 1081 } 1082 1083 size = sbc_get_size(cmd, 1); 1084 cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1085 1086 /* 1087 * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1088 * of byte 1 bit 3 UNMAP instead of original reserved field 1089 */ 1090 ret = sbc_setup_write_same(cmd, &cdb[1], ops); 1091 if (ret) 1092 return ret; 1093 break; 1094 case VERIFY: 1095 size = 0; 1096 sectors = transport_get_sectors_10(cdb); 1097 cmd->t_task_lba = transport_lba_32(cdb); 1098 cmd->execute_cmd = sbc_emulate_noop; 1099 goto check_lba; 1100 case REZERO_UNIT: 1101 case SEEK_6: 1102 case SEEK_10: 1103 /* 1104 * There are still clients out there which use these old SCSI-2 1105 * commands. This mainly happens when running VMs with legacy 1106 * guest systems, connected via SCSI command pass-through to 1107 * iSCSI targets. Make them happy and return status GOOD. 1108 */ 1109 size = 0; 1110 cmd->execute_cmd = sbc_emulate_noop; 1111 break; 1112 case START_STOP: 1113 size = 0; 1114 cmd->execute_cmd = sbc_emulate_startstop; 1115 break; 1116 default: 1117 ret = spc_parse_cdb(cmd, &size); 1118 if (ret) 1119 return ret; 1120 } 1121 1122 /* reject any command that we don't have a handler for */ 1123 if (!cmd->execute_cmd) 1124 return TCM_UNSUPPORTED_SCSI_OPCODE; 1125 1126 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 1127 unsigned long long end_lba; 1128 check_lba: 1129 end_lba = dev->transport->get_blocks(dev) + 1; 1130 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1131 ((cmd->t_task_lba + sectors) > end_lba)) { 1132 pr_err("cmd exceeds last lba %llu " 1133 "(lba %llu, sectors %u)\n", 1134 end_lba, cmd->t_task_lba, sectors); 1135 return TCM_ADDRESS_OUT_OF_RANGE; 1136 } 1137 1138 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 1139 size = sbc_get_size(cmd, sectors); 1140 } 1141 1142 return target_cmd_size_check(cmd, size); 1143 } 1144 EXPORT_SYMBOL(sbc_parse_cdb); 1145 1146 u32 sbc_get_device_type(struct se_device *dev) 1147 { 1148 return TYPE_DISK; 1149 } 1150 EXPORT_SYMBOL(sbc_get_device_type); 1151 1152 static sense_reason_t 1153 sbc_execute_unmap(struct se_cmd *cmd) 1154 { 1155 struct sbc_ops *ops = cmd->protocol_data; 1156 struct se_device *dev = cmd->se_dev; 1157 unsigned char *buf, *ptr = NULL; 1158 sector_t lba; 1159 int size; 1160 u32 range; 1161 sense_reason_t ret = 0; 1162 int dl, bd_dl; 1163 1164 /* We never set ANC_SUP */ 1165 if (cmd->t_task_cdb[1]) 1166 return TCM_INVALID_CDB_FIELD; 1167 1168 if (cmd->data_length == 0) { 1169 target_complete_cmd(cmd, SAM_STAT_GOOD); 1170 return 0; 1171 } 1172 1173 if (cmd->data_length < 8) { 1174 pr_warn("UNMAP parameter list length %u too small\n", 1175 cmd->data_length); 1176 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1177 } 1178 1179 buf = transport_kmap_data_sg(cmd); 1180 if (!buf) 1181 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1182 1183 dl = get_unaligned_be16(&buf[0]); 1184 bd_dl = get_unaligned_be16(&buf[2]); 1185 1186 size = cmd->data_length - 8; 1187 if (bd_dl > size) 1188 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 1189 cmd->data_length, bd_dl); 1190 else 1191 size = bd_dl; 1192 1193 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 1194 ret = TCM_INVALID_PARAMETER_LIST; 1195 goto err; 1196 } 1197 1198 /* First UNMAP block descriptor starts at 8 byte offset */ 1199 ptr = &buf[8]; 1200 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 1201 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1202 1203 while (size >= 16) { 1204 lba = get_unaligned_be64(&ptr[0]); 1205 range = get_unaligned_be32(&ptr[8]); 1206 pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1207 (unsigned long long)lba, range); 1208 1209 if (range > dev->dev_attrib.max_unmap_lba_count) { 1210 ret = TCM_INVALID_PARAMETER_LIST; 1211 goto err; 1212 } 1213 1214 if (lba + range > dev->transport->get_blocks(dev) + 1) { 1215 ret = TCM_ADDRESS_OUT_OF_RANGE; 1216 goto err; 1217 } 1218 1219 ret = ops->execute_unmap(cmd, lba, range); 1220 if (ret) 1221 goto err; 1222 1223 ptr += 16; 1224 size -= 16; 1225 } 1226 1227 err: 1228 transport_kunmap_data_sg(cmd); 1229 if (!ret) 1230 target_complete_cmd(cmd, GOOD); 1231 return ret; 1232 } 1233 1234 void 1235 sbc_dif_generate(struct se_cmd *cmd) 1236 { 1237 struct se_device *dev = cmd->se_dev; 1238 struct t10_pi_tuple *sdt; 1239 struct scatterlist *dsg = cmd->t_data_sg, *psg; 1240 sector_t sector = cmd->t_task_lba; 1241 void *daddr, *paddr; 1242 int i, j, offset = 0; 1243 unsigned int block_size = dev->dev_attrib.block_size; 1244 1245 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1246 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1247 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1248 1249 for (j = 0; j < psg->length; 1250 j += sizeof(*sdt)) { 1251 __u16 crc; 1252 unsigned int avail; 1253 1254 if (offset >= dsg->length) { 1255 offset -= dsg->length; 1256 kunmap_atomic(daddr - dsg->offset); 1257 dsg = sg_next(dsg); 1258 if (!dsg) { 1259 kunmap_atomic(paddr - psg->offset); 1260 return; 1261 } 1262 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1263 } 1264 1265 sdt = paddr + j; 1266 avail = min(block_size, dsg->length - offset); 1267 crc = crc_t10dif(daddr + offset, avail); 1268 if (avail < block_size) { 1269 kunmap_atomic(daddr - dsg->offset); 1270 dsg = sg_next(dsg); 1271 if (!dsg) { 1272 kunmap_atomic(paddr - psg->offset); 1273 return; 1274 } 1275 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1276 offset = block_size - avail; 1277 crc = crc_t10dif_update(crc, daddr, offset); 1278 } else { 1279 offset += block_size; 1280 } 1281 1282 sdt->guard_tag = cpu_to_be16(crc); 1283 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 1284 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 1285 sdt->app_tag = 0; 1286 1287 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 1288 " app_tag: 0x%04x ref_tag: %u\n", 1289 (cmd->data_direction == DMA_TO_DEVICE) ? 1290 "WRITE" : "READ", (unsigned long long)sector, 1291 sdt->guard_tag, sdt->app_tag, 1292 be32_to_cpu(sdt->ref_tag)); 1293 1294 sector++; 1295 } 1296 1297 kunmap_atomic(daddr - dsg->offset); 1298 kunmap_atomic(paddr - psg->offset); 1299 } 1300 } 1301 1302 static sense_reason_t 1303 sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, 1304 __u16 crc, sector_t sector, unsigned int ei_lba) 1305 { 1306 __be16 csum; 1307 1308 if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1309 goto check_ref; 1310 1311 csum = cpu_to_be16(crc); 1312 1313 if (sdt->guard_tag != csum) { 1314 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 1315 " csum 0x%04x\n", (unsigned long long)sector, 1316 be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 1317 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1318 } 1319 1320 check_ref: 1321 if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1322 return 0; 1323 1324 if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 1325 be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 1326 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 1327 " sector MSB: 0x%08x\n", (unsigned long long)sector, 1328 be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 1329 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1330 } 1331 1332 if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 1333 be32_to_cpu(sdt->ref_tag) != ei_lba) { 1334 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 1335 " ei_lba: 0x%08x\n", (unsigned long long)sector, 1336 be32_to_cpu(sdt->ref_tag), ei_lba); 1337 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1338 } 1339 1340 return 0; 1341 } 1342 1343 void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 1344 struct scatterlist *sg, int sg_off) 1345 { 1346 struct se_device *dev = cmd->se_dev; 1347 struct scatterlist *psg; 1348 void *paddr, *addr; 1349 unsigned int i, len, left; 1350 unsigned int offset = sg_off; 1351 1352 if (!sg) 1353 return; 1354 1355 left = sectors * dev->prot_length; 1356 1357 for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 1358 unsigned int psg_len, copied = 0; 1359 1360 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1361 psg_len = min(left, psg->length); 1362 while (psg_len) { 1363 len = min(psg_len, sg->length - offset); 1364 addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 1365 1366 if (read) 1367 memcpy(paddr + copied, addr, len); 1368 else 1369 memcpy(addr, paddr + copied, len); 1370 1371 left -= len; 1372 offset += len; 1373 copied += len; 1374 psg_len -= len; 1375 1376 kunmap_atomic(addr - sg->offset - offset); 1377 1378 if (offset >= sg->length) { 1379 sg = sg_next(sg); 1380 offset = 0; 1381 } 1382 } 1383 kunmap_atomic(paddr - psg->offset); 1384 } 1385 } 1386 EXPORT_SYMBOL(sbc_dif_copy_prot); 1387 1388 sense_reason_t 1389 sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1390 unsigned int ei_lba, struct scatterlist *psg, int psg_off) 1391 { 1392 struct se_device *dev = cmd->se_dev; 1393 struct t10_pi_tuple *sdt; 1394 struct scatterlist *dsg = cmd->t_data_sg; 1395 sector_t sector = start; 1396 void *daddr, *paddr; 1397 int i; 1398 sense_reason_t rc; 1399 int dsg_off = 0; 1400 unsigned int block_size = dev->dev_attrib.block_size; 1401 1402 for (; psg && sector < start + sectors; psg = sg_next(psg)) { 1403 paddr = kmap_atomic(sg_page(psg)) + psg->offset; 1404 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1405 1406 for (i = psg_off; i < psg->length && 1407 sector < start + sectors; 1408 i += sizeof(*sdt)) { 1409 __u16 crc; 1410 unsigned int avail; 1411 1412 if (dsg_off >= dsg->length) { 1413 dsg_off -= dsg->length; 1414 kunmap_atomic(daddr - dsg->offset); 1415 dsg = sg_next(dsg); 1416 if (!dsg) { 1417 kunmap_atomic(paddr - psg->offset); 1418 return 0; 1419 } 1420 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1421 } 1422 1423 sdt = paddr + i; 1424 1425 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 1426 " app_tag: 0x%04x ref_tag: %u\n", 1427 (unsigned long long)sector, sdt->guard_tag, 1428 sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 1429 1430 if (sdt->app_tag == cpu_to_be16(0xffff)) { 1431 dsg_off += block_size; 1432 goto next; 1433 } 1434 1435 avail = min(block_size, dsg->length - dsg_off); 1436 crc = crc_t10dif(daddr + dsg_off, avail); 1437 if (avail < block_size) { 1438 kunmap_atomic(daddr - dsg->offset); 1439 dsg = sg_next(dsg); 1440 if (!dsg) { 1441 kunmap_atomic(paddr - psg->offset); 1442 return 0; 1443 } 1444 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1445 dsg_off = block_size - avail; 1446 crc = crc_t10dif_update(crc, daddr, dsg_off); 1447 } else { 1448 dsg_off += block_size; 1449 } 1450 1451 rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 1452 if (rc) { 1453 kunmap_atomic(daddr - dsg->offset); 1454 kunmap_atomic(paddr - psg->offset); 1455 cmd->bad_sector = sector; 1456 return rc; 1457 } 1458 next: 1459 sector++; 1460 ei_lba++; 1461 } 1462 1463 psg_off = 0; 1464 kunmap_atomic(daddr - dsg->offset); 1465 kunmap_atomic(paddr - psg->offset); 1466 } 1467 1468 return 0; 1469 } 1470 EXPORT_SYMBOL(sbc_dif_verify); 1471