1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_xcopy.c 4 * 5 * This file contains support for SPC-4 Extended-Copy offload with generic 6 * TCM backends. 7 * 8 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved. 9 * 10 * Author: 11 * Nicholas A. Bellinger <nab@daterainc.com> 12 * 13 ******************************************************************************/ 14 15 #include <linux/slab.h> 16 #include <linux/spinlock.h> 17 #include <linux/list.h> 18 #include <linux/configfs.h> 19 #include <linux/ratelimit.h> 20 #include <scsi/scsi_proto.h> 21 #include <asm/unaligned.h> 22 23 #include <target/target_core_base.h> 24 #include <target/target_core_backend.h> 25 #include <target/target_core_fabric.h> 26 27 #include "target_core_internal.h" 28 #include "target_core_pr.h" 29 #include "target_core_ua.h" 30 #include "target_core_xcopy.h" 31 32 static struct workqueue_struct *xcopy_wq = NULL; 33 34 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop); 35 36 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf) 37 { 38 int off = 0; 39 40 buf[off++] = (0x6 << 4); 41 buf[off++] = 0x01; 42 buf[off++] = 0x40; 43 buf[off] = (0x5 << 4); 44 45 spc_parse_naa_6h_vendor_specific(dev, &buf[off]); 46 return 0; 47 } 48 49 struct xcopy_dev_search_info { 50 const unsigned char *dev_wwn; 51 struct se_device *found_dev; 52 }; 53 54 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev, 55 void *data) 56 { 57 struct xcopy_dev_search_info *info = data; 58 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN]; 59 int rc; 60 61 if (!se_dev->dev_attrib.emulate_3pc) 62 return 0; 63 64 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 65 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]); 66 67 rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); 68 if (rc != 0) 69 return 0; 70 71 info->found_dev = se_dev; 72 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev); 73 74 rc = target_depend_item(&se_dev->dev_group.cg_item); 75 if (rc != 0) { 76 pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n", 77 rc, se_dev); 78 return rc; 79 } 80 81 pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n", 82 se_dev, &se_dev->dev_group); 83 return 1; 84 } 85 86 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn, 87 struct se_device **found_dev) 88 { 89 struct xcopy_dev_search_info info; 90 int ret; 91 92 memset(&info, 0, sizeof(info)); 93 info.dev_wwn = dev_wwn; 94 95 ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info); 96 if (ret == 1) { 97 *found_dev = info.found_dev; 98 return 0; 99 } else { 100 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n"); 101 return -EINVAL; 102 } 103 } 104 105 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, 106 unsigned char *p, unsigned short cscd_index) 107 { 108 unsigned char *desc = p; 109 unsigned short ript; 110 u8 desig_len; 111 /* 112 * Extract RELATIVE INITIATOR PORT IDENTIFIER 113 */ 114 ript = get_unaligned_be16(&desc[2]); 115 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript); 116 /* 117 * Check for supported code set, association, and designator type 118 */ 119 if ((desc[4] & 0x0f) != 0x1) { 120 pr_err("XCOPY 0xe4: code set of non binary type not supported\n"); 121 return -EINVAL; 122 } 123 if ((desc[5] & 0x30) != 0x00) { 124 pr_err("XCOPY 0xe4: association other than LUN not supported\n"); 125 return -EINVAL; 126 } 127 if ((desc[5] & 0x0f) != 0x3) { 128 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n", 129 (desc[5] & 0x0f)); 130 return -EINVAL; 131 } 132 /* 133 * Check for matching 16 byte length for NAA IEEE Registered Extended 134 * Assigned designator 135 */ 136 desig_len = desc[7]; 137 if (desig_len != 16) { 138 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len); 139 return -EINVAL; 140 } 141 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len); 142 /* 143 * Check for NAA IEEE Registered Extended Assigned header.. 144 */ 145 if ((desc[8] & 0xf0) != 0x60) { 146 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n", 147 (desc[8] & 0xf0)); 148 return -EINVAL; 149 } 150 151 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) { 152 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor " 153 "dest\n", cscd_index); 154 return 0; 155 } 156 157 if (cscd_index == xop->stdi) { 158 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 159 /* 160 * Determine if the source designator matches the local device 161 */ 162 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0], 163 XCOPY_NAA_IEEE_REGEX_LEN)) { 164 xop->op_origin = XCOL_SOURCE_RECV_OP; 165 xop->src_dev = se_cmd->se_dev; 166 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source" 167 " received xop\n", xop->src_dev); 168 } 169 } 170 171 if (cscd_index == xop->dtdi) { 172 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 173 /* 174 * Determine if the destination designator matches the local 175 * device. If @cscd_index corresponds to both source (stdi) and 176 * destination (dtdi), or dtdi comes after stdi, then 177 * XCOL_DEST_RECV_OP wins. 178 */ 179 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0], 180 XCOPY_NAA_IEEE_REGEX_LEN)) { 181 xop->op_origin = XCOL_DEST_RECV_OP; 182 xop->dst_dev = se_cmd->se_dev; 183 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination" 184 " received xop\n", xop->dst_dev); 185 } 186 } 187 188 return 0; 189 } 190 191 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd, 192 struct xcopy_op *xop, unsigned char *p, 193 unsigned short tdll, sense_reason_t *sense_ret) 194 { 195 struct se_device *local_dev = se_cmd->se_dev; 196 unsigned char *desc = p; 197 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc; 198 unsigned short cscd_index = 0; 199 unsigned short start = 0; 200 201 *sense_ret = TCM_INVALID_PARAMETER_LIST; 202 203 if (offset != 0) { 204 pr_err("XCOPY target descriptor list length is not" 205 " multiple of %d\n", XCOPY_TARGET_DESC_LEN); 206 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 207 return -EINVAL; 208 } 209 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) { 210 pr_err("XCOPY target descriptor supports a maximum" 211 " two src/dest descriptors, tdll: %hu too large..\n", tdll); 212 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */ 213 *sense_ret = TCM_TOO_MANY_TARGET_DESCS; 214 return -EINVAL; 215 } 216 /* 217 * Generate an IEEE Registered Extended designator based upon the 218 * se_device the XCOPY was received upon.. 219 */ 220 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 221 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]); 222 223 while (start < tdll) { 224 /* 225 * Check target descriptor identification with 0xE4 type, and 226 * compare the current index with the CSCD descriptor IDs in 227 * the segment descriptor. Use VPD 0x83 WWPN matching .. 228 */ 229 switch (desc[0]) { 230 case 0xe4: 231 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop, 232 &desc[0], cscd_index); 233 if (rc != 0) 234 goto out; 235 start += XCOPY_TARGET_DESC_LEN; 236 desc += XCOPY_TARGET_DESC_LEN; 237 cscd_index++; 238 break; 239 default: 240 pr_err("XCOPY unsupported descriptor type code:" 241 " 0x%02x\n", desc[0]); 242 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 243 goto out; 244 } 245 } 246 247 switch (xop->op_origin) { 248 case XCOL_SOURCE_RECV_OP: 249 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn, 250 &xop->dst_dev); 251 break; 252 case XCOL_DEST_RECV_OP: 253 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn, 254 &xop->src_dev); 255 break; 256 default: 257 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - " 258 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi); 259 rc = -EINVAL; 260 break; 261 } 262 /* 263 * If a matching IEEE NAA 0x83 descriptor for the requested device 264 * is not located on this node, return COPY_ABORTED with ASQ/ASQC 265 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the 266 * initiator to fall back to normal copy method. 267 */ 268 if (rc < 0) { 269 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE; 270 goto out; 271 } 272 273 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n", 274 xop->src_dev, &xop->src_tid_wwn[0]); 275 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n", 276 xop->dst_dev, &xop->dst_tid_wwn[0]); 277 278 return cscd_index; 279 280 out: 281 return -EINVAL; 282 } 283 284 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop, 285 unsigned char *p) 286 { 287 unsigned char *desc = p; 288 int dc = (desc[1] & 0x02); 289 unsigned short desc_len; 290 291 desc_len = get_unaligned_be16(&desc[2]); 292 if (desc_len != 0x18) { 293 pr_err("XCOPY segment desc 0x02: Illegal desc_len:" 294 " %hu\n", desc_len); 295 return -EINVAL; 296 } 297 298 xop->stdi = get_unaligned_be16(&desc[4]); 299 xop->dtdi = get_unaligned_be16(&desc[6]); 300 301 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX || 302 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) { 303 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n", 304 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi); 305 return -EINVAL; 306 } 307 308 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n", 309 desc_len, xop->stdi, xop->dtdi, dc); 310 311 xop->nolb = get_unaligned_be16(&desc[10]); 312 xop->src_lba = get_unaligned_be64(&desc[12]); 313 xop->dst_lba = get_unaligned_be64(&desc[20]); 314 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n", 315 xop->nolb, (unsigned long long)xop->src_lba, 316 (unsigned long long)xop->dst_lba); 317 318 if (dc != 0) { 319 xop->dbl = get_unaligned_be24(&desc[29]); 320 321 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl); 322 } 323 return 0; 324 } 325 326 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd, 327 struct xcopy_op *xop, unsigned char *p, 328 unsigned int sdll, sense_reason_t *sense_ret) 329 { 330 unsigned char *desc = p; 331 unsigned int start = 0; 332 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; 333 334 *sense_ret = TCM_INVALID_PARAMETER_LIST; 335 336 if (offset != 0) { 337 pr_err("XCOPY segment descriptor list length is not" 338 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); 339 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 340 return -EINVAL; 341 } 342 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) { 343 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too" 344 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll); 345 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */ 346 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS; 347 return -EINVAL; 348 } 349 350 while (start < sdll) { 351 /* 352 * Check segment descriptor type code for block -> block 353 */ 354 switch (desc[0]) { 355 case 0x02: 356 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); 357 if (rc < 0) 358 goto out; 359 360 ret++; 361 start += XCOPY_SEGMENT_DESC_LEN; 362 desc += XCOPY_SEGMENT_DESC_LEN; 363 break; 364 default: 365 pr_err("XCOPY unsupported segment descriptor" 366 "type: 0x%02x\n", desc[0]); 367 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 368 goto out; 369 } 370 } 371 372 return ret; 373 374 out: 375 return -EINVAL; 376 } 377 378 /* 379 * Start xcopy_pt ops 380 */ 381 382 struct xcopy_pt_cmd { 383 struct se_cmd se_cmd; 384 struct completion xpt_passthrough_sem; 385 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; 386 }; 387 388 struct se_portal_group xcopy_pt_tpg; 389 static struct se_session xcopy_pt_sess; 390 static struct se_node_acl xcopy_pt_nacl; 391 392 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) 393 { 394 return 0; 395 } 396 397 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) 398 { 399 struct se_device *remote_dev; 400 401 if (xop->op_origin == XCOL_SOURCE_RECV_OP) 402 remote_dev = xop->dst_dev; 403 else 404 remote_dev = xop->src_dev; 405 406 pr_debug("Calling configfs_undepend_item for" 407 " remote_dev: %p remote_dev->dev_group: %p\n", 408 remote_dev, &remote_dev->dev_group.cg_item); 409 410 target_undepend_item(&remote_dev->dev_group.cg_item); 411 } 412 413 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) 414 { 415 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 416 struct xcopy_pt_cmd, se_cmd); 417 418 kfree(xpt_cmd); 419 } 420 421 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd) 422 { 423 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 424 struct xcopy_pt_cmd, se_cmd); 425 426 complete(&xpt_cmd->xpt_passthrough_sem); 427 return 0; 428 } 429 430 static int xcopy_pt_write_pending(struct se_cmd *se_cmd) 431 { 432 return 0; 433 } 434 435 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) 436 { 437 return 0; 438 } 439 440 static int xcopy_pt_queue_status(struct se_cmd *se_cmd) 441 { 442 return 0; 443 } 444 445 static const struct target_core_fabric_ops xcopy_pt_tfo = { 446 .fabric_name = "xcopy-pt", 447 .get_cmd_state = xcopy_pt_get_cmd_state, 448 .release_cmd = xcopy_pt_release_cmd, 449 .check_stop_free = xcopy_pt_check_stop_free, 450 .write_pending = xcopy_pt_write_pending, 451 .queue_data_in = xcopy_pt_queue_data_in, 452 .queue_status = xcopy_pt_queue_status, 453 }; 454 455 /* 456 * End xcopy_pt_ops 457 */ 458 459 int target_xcopy_setup_pt(void) 460 { 461 int ret; 462 463 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0); 464 if (!xcopy_wq) { 465 pr_err("Unable to allocate xcopy_wq\n"); 466 return -ENOMEM; 467 } 468 469 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); 470 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); 471 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); 472 473 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; 474 475 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); 476 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); 477 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); 478 memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); 479 ret = transport_init_session(&xcopy_pt_sess); 480 if (ret < 0) 481 return ret; 482 483 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; 484 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; 485 486 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; 487 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; 488 489 return 0; 490 } 491 492 void target_xcopy_release_pt(void) 493 { 494 if (xcopy_wq) 495 destroy_workqueue(xcopy_wq); 496 } 497 498 /* 499 * target_xcopy_setup_pt_cmd - set up a pass-through command 500 * @xpt_cmd: Data structure to initialize. 501 * @xop: Describes the XCOPY operation received from an initiator. 502 * @se_dev: Backend device to associate with @xpt_cmd if 503 * @remote_port == true. 504 * @cdb: SCSI CDB to be copied into @xpt_cmd. 505 * @remote_port: If false, use the LUN through which the XCOPY command has 506 * been received. If true, use @se_dev->xcopy_lun. 507 * @alloc_mem: Whether or not to allocate an SGL list. 508 * 509 * Set up a SCSI command (READ or WRITE) that will be used to execute an 510 * XCOPY command. 511 */ 512 static int target_xcopy_setup_pt_cmd( 513 struct xcopy_pt_cmd *xpt_cmd, 514 struct xcopy_op *xop, 515 struct se_device *se_dev, 516 unsigned char *cdb, 517 bool remote_port, 518 bool alloc_mem) 519 { 520 struct se_cmd *cmd = &xpt_cmd->se_cmd; 521 sense_reason_t sense_rc; 522 int ret = 0, rc; 523 524 /* 525 * Setup LUN+port to honor reservations based upon xop->op_origin for 526 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. 527 */ 528 if (remote_port) { 529 cmd->se_lun = &se_dev->xcopy_lun; 530 cmd->se_dev = se_dev; 531 } else { 532 cmd->se_lun = xop->xop_se_cmd->se_lun; 533 cmd->se_dev = xop->xop_se_cmd->se_dev; 534 } 535 cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 536 537 cmd->tag = 0; 538 sense_rc = target_setup_cmd_from_cdb(cmd, cdb); 539 if (sense_rc) { 540 ret = -EINVAL; 541 goto out; 542 } 543 544 if (alloc_mem) { 545 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, 546 cmd->data_length, false, false); 547 if (rc < 0) { 548 ret = rc; 549 goto out; 550 } 551 /* 552 * Set this bit so that transport_free_pages() allows the 553 * caller to release SGLs + physical memory allocated by 554 * transport_generic_get_mem().. 555 */ 556 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 557 } else { 558 /* 559 * Here the previously allocated SGLs for the internal READ 560 * are mapped zero-copy to the internal WRITE. 561 */ 562 sense_rc = transport_generic_map_mem_to_cmd(cmd, 563 xop->xop_data_sg, xop->xop_data_nents, 564 NULL, 0); 565 if (sense_rc) { 566 ret = -EINVAL; 567 goto out; 568 } 569 570 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" 571 " %u\n", cmd->t_data_sg, cmd->t_data_nents); 572 } 573 574 return 0; 575 576 out: 577 return ret; 578 } 579 580 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) 581 { 582 struct se_cmd *se_cmd = &xpt_cmd->se_cmd; 583 sense_reason_t sense_rc; 584 585 sense_rc = transport_generic_new_cmd(se_cmd); 586 if (sense_rc) 587 return -EINVAL; 588 589 if (se_cmd->data_direction == DMA_TO_DEVICE) 590 target_execute_cmd(se_cmd); 591 592 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); 593 594 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", 595 se_cmd->scsi_status); 596 597 return (se_cmd->scsi_status) ? -EINVAL : 0; 598 } 599 600 static int target_xcopy_read_source( 601 struct se_cmd *ec_cmd, 602 struct xcopy_op *xop, 603 struct se_device *src_dev, 604 sector_t src_lba, 605 u32 src_sectors) 606 { 607 struct xcopy_pt_cmd *xpt_cmd; 608 struct se_cmd *se_cmd; 609 u32 length = (src_sectors * src_dev->dev_attrib.block_size); 610 int rc; 611 unsigned char cdb[16]; 612 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); 613 614 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 615 if (!xpt_cmd) { 616 pr_err("Unable to allocate xcopy_pt_cmd\n"); 617 return -ENOMEM; 618 } 619 init_completion(&xpt_cmd->xpt_passthrough_sem); 620 se_cmd = &xpt_cmd->se_cmd; 621 622 memset(&cdb[0], 0, 16); 623 cdb[0] = READ_16; 624 put_unaligned_be64(src_lba, &cdb[2]); 625 put_unaligned_be32(src_sectors, &cdb[10]); 626 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", 627 (unsigned long long)src_lba, src_sectors, length); 628 629 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 630 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 631 xop->src_pt_cmd = xpt_cmd; 632 633 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0], 634 remote_port, true); 635 if (rc < 0) { 636 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 637 transport_generic_free_cmd(se_cmd, 0); 638 return rc; 639 } 640 641 xop->xop_data_sg = se_cmd->t_data_sg; 642 xop->xop_data_nents = se_cmd->t_data_nents; 643 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" 644 " memory\n", xop->xop_data_sg, xop->xop_data_nents); 645 646 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 647 if (rc < 0) { 648 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 649 transport_generic_free_cmd(se_cmd, 0); 650 return rc; 651 } 652 /* 653 * Clear off the allocated t_data_sg, that has been saved for 654 * zero-copy WRITE submission reuse in struct xcopy_op.. 655 */ 656 se_cmd->t_data_sg = NULL; 657 se_cmd->t_data_nents = 0; 658 659 return 0; 660 } 661 662 static int target_xcopy_write_destination( 663 struct se_cmd *ec_cmd, 664 struct xcopy_op *xop, 665 struct se_device *dst_dev, 666 sector_t dst_lba, 667 u32 dst_sectors) 668 { 669 struct xcopy_pt_cmd *xpt_cmd; 670 struct se_cmd *se_cmd; 671 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); 672 int rc; 673 unsigned char cdb[16]; 674 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); 675 676 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 677 if (!xpt_cmd) { 678 pr_err("Unable to allocate xcopy_pt_cmd\n"); 679 return -ENOMEM; 680 } 681 init_completion(&xpt_cmd->xpt_passthrough_sem); 682 se_cmd = &xpt_cmd->se_cmd; 683 684 memset(&cdb[0], 0, 16); 685 cdb[0] = WRITE_16; 686 put_unaligned_be64(dst_lba, &cdb[2]); 687 put_unaligned_be32(dst_sectors, &cdb[10]); 688 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", 689 (unsigned long long)dst_lba, dst_sectors, length); 690 691 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 692 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 693 xop->dst_pt_cmd = xpt_cmd; 694 695 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0], 696 remote_port, false); 697 if (rc < 0) { 698 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd; 699 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 700 /* 701 * If the failure happened before the t_mem_list hand-off in 702 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that 703 * core releases this memory on error during X-COPY WRITE I/O. 704 */ 705 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 706 src_cmd->t_data_sg = xop->xop_data_sg; 707 src_cmd->t_data_nents = xop->xop_data_nents; 708 709 transport_generic_free_cmd(se_cmd, 0); 710 return rc; 711 } 712 713 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 714 if (rc < 0) { 715 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 716 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 717 transport_generic_free_cmd(se_cmd, 0); 718 return rc; 719 } 720 721 return 0; 722 } 723 724 static void target_xcopy_do_work(struct work_struct *work) 725 { 726 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); 727 struct se_cmd *ec_cmd = xop->xop_se_cmd; 728 struct se_device *src_dev, *dst_dev; 729 sector_t src_lba, dst_lba, end_lba; 730 unsigned int max_sectors; 731 int rc = 0; 732 unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0; 733 734 if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE) 735 goto err_free; 736 737 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) 738 goto err_free; 739 740 src_dev = xop->src_dev; 741 dst_dev = xop->dst_dev; 742 src_lba = xop->src_lba; 743 dst_lba = xop->dst_lba; 744 nolb = xop->nolb; 745 end_lba = src_lba + nolb; 746 /* 747 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the 748 * smallest max_sectors between src_dev + dev_dev, or 749 */ 750 max_sectors = min(src_dev->dev_attrib.hw_max_sectors, 751 dst_dev->dev_attrib.hw_max_sectors); 752 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); 753 754 max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); 755 756 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", 757 nolb, max_nolb, (unsigned long long)end_lba); 758 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", 759 (unsigned long long)src_lba, (unsigned long long)dst_lba); 760 761 while (src_lba < end_lba) { 762 cur_nolb = min(nolb, max_nolb); 763 764 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," 765 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); 766 767 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); 768 if (rc < 0) 769 goto out; 770 771 src_lba += cur_nolb; 772 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", 773 (unsigned long long)src_lba); 774 775 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," 776 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); 777 778 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, 779 dst_lba, cur_nolb); 780 if (rc < 0) { 781 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 782 goto out; 783 } 784 785 dst_lba += cur_nolb; 786 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", 787 (unsigned long long)dst_lba); 788 789 copied_nolb += cur_nolb; 790 nolb -= cur_nolb; 791 792 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 793 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 794 795 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0); 796 } 797 798 xcopy_pt_undepend_remotedev(xop); 799 kfree(xop); 800 801 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", 802 (unsigned long long)src_lba, (unsigned long long)dst_lba); 803 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", 804 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); 805 806 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); 807 target_complete_cmd(ec_cmd, SAM_STAT_GOOD); 808 return; 809 810 out: 811 xcopy_pt_undepend_remotedev(xop); 812 813 err_free: 814 kfree(xop); 815 /* 816 * Don't override an error scsi status if it has already been set 817 */ 818 if (ec_cmd->scsi_status == SAM_STAT_GOOD) { 819 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY" 820 " CHECK_CONDITION -> sending response\n", rc); 821 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 822 } 823 target_complete_cmd(ec_cmd, ec_cmd->scsi_status); 824 } 825 826 /* 827 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing 828 * fails. 829 */ 830 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop) 831 { 832 struct se_cmd *se_cmd = xop->xop_se_cmd; 833 unsigned char *p = NULL, *seg_desc; 834 unsigned int list_id, list_id_usage, sdll, inline_dl; 835 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; 836 int rc; 837 unsigned short tdll; 838 839 p = transport_kmap_data_sg(se_cmd); 840 if (!p) { 841 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); 842 return TCM_OUT_OF_RESOURCES; 843 } 844 845 list_id = p[0]; 846 list_id_usage = (p[1] & 0x18) >> 3; 847 848 /* 849 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH 850 */ 851 tdll = get_unaligned_be16(&p[2]); 852 sdll = get_unaligned_be32(&p[8]); 853 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) { 854 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n", 855 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN); 856 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 857 goto out; 858 } 859 860 inline_dl = get_unaligned_be32(&p[12]); 861 if (inline_dl != 0) { 862 pr_err("XCOPY with non zero inline data length\n"); 863 goto out; 864 } 865 866 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) { 867 pr_err("XCOPY parameter truncation: data length %u too small " 868 "for tdll: %hu sdll: %u inline_dl: %u\n", 869 se_cmd->data_length, tdll, sdll, inline_dl); 870 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 871 goto out; 872 } 873 874 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" 875 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, 876 tdll, sdll, inline_dl); 877 878 /* 879 * skip over the target descriptors until segment descriptors 880 * have been passed - CSCD ids are needed to determine src and dest. 881 */ 882 seg_desc = &p[16] + tdll; 883 884 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, 885 sdll, &ret); 886 if (rc <= 0) 887 goto out; 888 889 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, 890 rc * XCOPY_SEGMENT_DESC_LEN); 891 892 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret); 893 if (rc <= 0) 894 goto out; 895 896 if (xop->src_dev->dev_attrib.block_size != 897 xop->dst_dev->dev_attrib.block_size) { 898 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" 899 " block_size: %u currently unsupported\n", 900 xop->src_dev->dev_attrib.block_size, 901 xop->dst_dev->dev_attrib.block_size); 902 xcopy_pt_undepend_remotedev(xop); 903 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 904 goto out; 905 } 906 907 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, 908 rc * XCOPY_TARGET_DESC_LEN); 909 transport_kunmap_data_sg(se_cmd); 910 return TCM_NO_SENSE; 911 912 out: 913 if (p) 914 transport_kunmap_data_sg(se_cmd); 915 return ret; 916 } 917 918 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) 919 { 920 struct se_device *dev = se_cmd->se_dev; 921 struct xcopy_op *xop; 922 unsigned int sa; 923 924 if (!dev->dev_attrib.emulate_3pc) { 925 pr_err("EXTENDED_COPY operation explicitly disabled\n"); 926 return TCM_UNSUPPORTED_SCSI_OPCODE; 927 } 928 929 sa = se_cmd->t_task_cdb[1] & 0x1f; 930 if (sa != 0x00) { 931 pr_err("EXTENDED_COPY(LID4) not supported\n"); 932 return TCM_UNSUPPORTED_SCSI_OPCODE; 933 } 934 935 if (se_cmd->data_length == 0) { 936 target_complete_cmd(se_cmd, SAM_STAT_GOOD); 937 return TCM_NO_SENSE; 938 } 939 if (se_cmd->data_length < XCOPY_HDR_LEN) { 940 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n", 941 se_cmd->data_length, XCOPY_HDR_LEN); 942 return TCM_PARAMETER_LIST_LENGTH_ERROR; 943 } 944 945 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); 946 if (!xop) 947 goto err; 948 xop->xop_se_cmd = se_cmd; 949 INIT_WORK(&xop->xop_work, target_xcopy_do_work); 950 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work))) 951 goto free; 952 return TCM_NO_SENSE; 953 954 free: 955 kfree(xop); 956 957 err: 958 return TCM_OUT_OF_RESOURCES; 959 } 960 961 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) 962 { 963 unsigned char *p; 964 965 p = transport_kmap_data_sg(se_cmd); 966 if (!p) { 967 pr_err("transport_kmap_data_sg failed in" 968 " target_rcr_operating_parameters\n"); 969 return TCM_OUT_OF_RESOURCES; 970 } 971 972 if (se_cmd->data_length < 54) { 973 pr_err("Receive Copy Results Op Parameters length" 974 " too small: %u\n", se_cmd->data_length); 975 transport_kunmap_data_sg(se_cmd); 976 return TCM_INVALID_CDB_FIELD; 977 } 978 /* 979 * Set SNLID=1 (Supports no List ID) 980 */ 981 p[4] = 0x1; 982 /* 983 * MAXIMUM TARGET DESCRIPTOR COUNT 984 */ 985 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); 986 /* 987 * MAXIMUM SEGMENT DESCRIPTOR COUNT 988 */ 989 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); 990 /* 991 * MAXIMUM DESCRIPTOR LIST LENGTH 992 */ 993 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); 994 /* 995 * MAXIMUM SEGMENT LENGTH 996 */ 997 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); 998 /* 999 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) 1000 */ 1001 put_unaligned_be32(0x0, &p[20]); 1002 /* 1003 * HELD DATA LIMIT 1004 */ 1005 put_unaligned_be32(0x0, &p[24]); 1006 /* 1007 * MAXIMUM STREAM DEVICE TRANSFER SIZE 1008 */ 1009 put_unaligned_be32(0x0, &p[28]); 1010 /* 1011 * TOTAL CONCURRENT COPIES 1012 */ 1013 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); 1014 /* 1015 * MAXIMUM CONCURRENT COPIES 1016 */ 1017 p[36] = RCR_OP_MAX_CONCURR_COPIES; 1018 /* 1019 * DATA SEGMENT GRANULARITY (log 2) 1020 */ 1021 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; 1022 /* 1023 * INLINE DATA GRANULARITY log 2) 1024 */ 1025 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; 1026 /* 1027 * HELD DATA GRANULARITY 1028 */ 1029 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; 1030 /* 1031 * IMPLEMENTED DESCRIPTOR LIST LENGTH 1032 */ 1033 p[43] = 0x2; 1034 /* 1035 * List of implemented descriptor type codes (ordered) 1036 */ 1037 p[44] = 0x02; /* Copy Block to Block device */ 1038 p[45] = 0xe4; /* Identification descriptor target descriptor */ 1039 1040 /* 1041 * AVAILABLE DATA (n-3) 1042 */ 1043 put_unaligned_be32(42, &p[0]); 1044 1045 transport_kunmap_data_sg(se_cmd); 1046 target_complete_cmd(se_cmd, GOOD); 1047 1048 return TCM_NO_SENSE; 1049 } 1050 1051 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) 1052 { 1053 unsigned char *cdb = &se_cmd->t_task_cdb[0]; 1054 int sa = (cdb[1] & 0x1f), list_id = cdb[2]; 1055 sense_reason_t rc = TCM_NO_SENSE; 1056 1057 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" 1058 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); 1059 1060 if (list_id != 0) { 1061 pr_err("Receive Copy Results with non zero list identifier" 1062 " not supported\n"); 1063 return TCM_INVALID_CDB_FIELD; 1064 } 1065 1066 switch (sa) { 1067 case RCR_SA_OPERATING_PARAMETERS: 1068 rc = target_rcr_operating_parameters(se_cmd); 1069 break; 1070 case RCR_SA_COPY_STATUS: 1071 case RCR_SA_RECEIVE_DATA: 1072 case RCR_SA_FAILED_SEGMENT_DETAILS: 1073 default: 1074 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); 1075 return TCM_INVALID_CDB_FIELD; 1076 } 1077 1078 return rc; 1079 } 1080