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 != XCOPY_NAA_IEEE_REGEX_LEN) { 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 return 0; 319 } 320 321 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd, 322 struct xcopy_op *xop, unsigned char *p, 323 unsigned int sdll, sense_reason_t *sense_ret) 324 { 325 unsigned char *desc = p; 326 unsigned int start = 0; 327 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; 328 329 *sense_ret = TCM_INVALID_PARAMETER_LIST; 330 331 if (offset != 0) { 332 pr_err("XCOPY segment descriptor list length is not" 333 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); 334 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 335 return -EINVAL; 336 } 337 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) { 338 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too" 339 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll); 340 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */ 341 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS; 342 return -EINVAL; 343 } 344 345 while (start < sdll) { 346 /* 347 * Check segment descriptor type code for block -> block 348 */ 349 switch (desc[0]) { 350 case 0x02: 351 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); 352 if (rc < 0) 353 goto out; 354 355 ret++; 356 start += XCOPY_SEGMENT_DESC_LEN; 357 desc += XCOPY_SEGMENT_DESC_LEN; 358 break; 359 default: 360 pr_err("XCOPY unsupported segment descriptor" 361 "type: 0x%02x\n", desc[0]); 362 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 363 goto out; 364 } 365 } 366 367 return ret; 368 369 out: 370 return -EINVAL; 371 } 372 373 /* 374 * Start xcopy_pt ops 375 */ 376 377 struct xcopy_pt_cmd { 378 struct se_cmd se_cmd; 379 struct completion xpt_passthrough_sem; 380 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; 381 }; 382 383 struct se_portal_group xcopy_pt_tpg; 384 static struct se_session xcopy_pt_sess; 385 static struct se_node_acl xcopy_pt_nacl; 386 387 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) 388 { 389 return 0; 390 } 391 392 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) 393 { 394 struct se_device *remote_dev; 395 396 if (xop->op_origin == XCOL_SOURCE_RECV_OP) 397 remote_dev = xop->dst_dev; 398 else 399 remote_dev = xop->src_dev; 400 401 pr_debug("Calling configfs_undepend_item for" 402 " remote_dev: %p remote_dev->dev_group: %p\n", 403 remote_dev, &remote_dev->dev_group.cg_item); 404 405 target_undepend_item(&remote_dev->dev_group.cg_item); 406 } 407 408 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) 409 { 410 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 411 struct xcopy_pt_cmd, se_cmd); 412 413 /* xpt_cmd is on the stack, nothing to free here */ 414 pr_debug("xpt_cmd done: %p\n", xpt_cmd); 415 } 416 417 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd) 418 { 419 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 420 struct xcopy_pt_cmd, se_cmd); 421 422 complete(&xpt_cmd->xpt_passthrough_sem); 423 return 0; 424 } 425 426 static int xcopy_pt_write_pending(struct se_cmd *se_cmd) 427 { 428 return 0; 429 } 430 431 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) 432 { 433 return 0; 434 } 435 436 static int xcopy_pt_queue_status(struct se_cmd *se_cmd) 437 { 438 return 0; 439 } 440 441 static const struct target_core_fabric_ops xcopy_pt_tfo = { 442 .fabric_name = "xcopy-pt", 443 .get_cmd_state = xcopy_pt_get_cmd_state, 444 .release_cmd = xcopy_pt_release_cmd, 445 .check_stop_free = xcopy_pt_check_stop_free, 446 .write_pending = xcopy_pt_write_pending, 447 .queue_data_in = xcopy_pt_queue_data_in, 448 .queue_status = xcopy_pt_queue_status, 449 }; 450 451 /* 452 * End xcopy_pt_ops 453 */ 454 455 int target_xcopy_setup_pt(void) 456 { 457 int ret; 458 459 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0); 460 if (!xcopy_wq) { 461 pr_err("Unable to allocate xcopy_wq\n"); 462 return -ENOMEM; 463 } 464 465 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); 466 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); 467 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); 468 469 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; 470 471 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); 472 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); 473 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); 474 memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); 475 ret = transport_init_session(&xcopy_pt_sess); 476 if (ret < 0) 477 return ret; 478 479 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; 480 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; 481 482 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; 483 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; 484 485 return 0; 486 } 487 488 void target_xcopy_release_pt(void) 489 { 490 if (xcopy_wq) 491 destroy_workqueue(xcopy_wq); 492 } 493 494 /* 495 * target_xcopy_setup_pt_cmd - set up a pass-through command 496 * @xpt_cmd: Data structure to initialize. 497 * @xop: Describes the XCOPY operation received from an initiator. 498 * @se_dev: Backend device to associate with @xpt_cmd if 499 * @remote_port == true. 500 * @cdb: SCSI CDB to be copied into @xpt_cmd. 501 * @remote_port: If false, use the LUN through which the XCOPY command has 502 * been received. If true, use @se_dev->xcopy_lun. 503 * 504 * Set up a SCSI command (READ or WRITE) that will be used to execute an 505 * XCOPY command. 506 */ 507 static int target_xcopy_setup_pt_cmd( 508 struct xcopy_pt_cmd *xpt_cmd, 509 struct xcopy_op *xop, 510 struct se_device *se_dev, 511 unsigned char *cdb, 512 bool remote_port) 513 { 514 struct se_cmd *cmd = &xpt_cmd->se_cmd; 515 516 /* 517 * Setup LUN+port to honor reservations based upon xop->op_origin for 518 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. 519 */ 520 if (remote_port) { 521 cmd->se_lun = &se_dev->xcopy_lun; 522 cmd->se_dev = se_dev; 523 } else { 524 cmd->se_lun = xop->xop_se_cmd->se_lun; 525 cmd->se_dev = xop->xop_se_cmd->se_dev; 526 } 527 cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 528 529 cmd->tag = 0; 530 if (target_setup_cmd_from_cdb(cmd, cdb)) 531 return -EINVAL; 532 533 if (transport_generic_map_mem_to_cmd(cmd, xop->xop_data_sg, 534 xop->xop_data_nents, NULL, 0)) 535 return -EINVAL; 536 537 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" 538 " %u\n", cmd->t_data_sg, cmd->t_data_nents); 539 540 return 0; 541 } 542 543 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) 544 { 545 struct se_cmd *se_cmd = &xpt_cmd->se_cmd; 546 sense_reason_t sense_rc; 547 548 sense_rc = transport_generic_new_cmd(se_cmd); 549 if (sense_rc) 550 return -EINVAL; 551 552 if (se_cmd->data_direction == DMA_TO_DEVICE) 553 target_execute_cmd(se_cmd); 554 555 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); 556 557 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", 558 se_cmd->scsi_status); 559 560 return (se_cmd->scsi_status) ? -EINVAL : 0; 561 } 562 563 static int target_xcopy_read_source( 564 struct se_cmd *ec_cmd, 565 struct xcopy_op *xop, 566 struct se_device *src_dev, 567 sector_t src_lba, 568 u32 src_sectors) 569 { 570 struct xcopy_pt_cmd xpt_cmd; 571 struct se_cmd *se_cmd = &xpt_cmd.se_cmd; 572 u32 length = (src_sectors * src_dev->dev_attrib.block_size); 573 int rc; 574 unsigned char cdb[16]; 575 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); 576 577 memset(&xpt_cmd, 0, sizeof(xpt_cmd)); 578 init_completion(&xpt_cmd.xpt_passthrough_sem); 579 580 memset(&cdb[0], 0, 16); 581 cdb[0] = READ_16; 582 put_unaligned_be64(src_lba, &cdb[2]); 583 put_unaligned_be32(src_sectors, &cdb[10]); 584 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", 585 (unsigned long long)src_lba, src_sectors, length); 586 587 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 588 DMA_FROM_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0); 589 590 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, src_dev, &cdb[0], 591 remote_port); 592 if (rc < 0) { 593 ec_cmd->scsi_status = se_cmd->scsi_status; 594 goto out; 595 } 596 597 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" 598 " memory\n", xop->xop_data_sg, xop->xop_data_nents); 599 600 rc = target_xcopy_issue_pt_cmd(&xpt_cmd); 601 if (rc < 0) 602 ec_cmd->scsi_status = se_cmd->scsi_status; 603 out: 604 transport_generic_free_cmd(se_cmd, 0); 605 return rc; 606 } 607 608 static int target_xcopy_write_destination( 609 struct se_cmd *ec_cmd, 610 struct xcopy_op *xop, 611 struct se_device *dst_dev, 612 sector_t dst_lba, 613 u32 dst_sectors) 614 { 615 struct xcopy_pt_cmd xpt_cmd; 616 struct se_cmd *se_cmd = &xpt_cmd.se_cmd; 617 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); 618 int rc; 619 unsigned char cdb[16]; 620 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); 621 622 memset(&xpt_cmd, 0, sizeof(xpt_cmd)); 623 init_completion(&xpt_cmd.xpt_passthrough_sem); 624 625 memset(&cdb[0], 0, 16); 626 cdb[0] = WRITE_16; 627 put_unaligned_be64(dst_lba, &cdb[2]); 628 put_unaligned_be32(dst_sectors, &cdb[10]); 629 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", 630 (unsigned long long)dst_lba, dst_sectors, length); 631 632 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 633 DMA_TO_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0); 634 635 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, dst_dev, &cdb[0], 636 remote_port); 637 if (rc < 0) { 638 ec_cmd->scsi_status = se_cmd->scsi_status; 639 goto out; 640 } 641 642 rc = target_xcopy_issue_pt_cmd(&xpt_cmd); 643 if (rc < 0) 644 ec_cmd->scsi_status = se_cmd->scsi_status; 645 out: 646 transport_generic_free_cmd(se_cmd, 0); 647 return rc; 648 } 649 650 static void target_xcopy_do_work(struct work_struct *work) 651 { 652 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); 653 struct se_cmd *ec_cmd = xop->xop_se_cmd; 654 struct se_device *src_dev, *dst_dev; 655 sector_t src_lba, dst_lba, end_lba; 656 unsigned int max_sectors; 657 int rc = 0; 658 unsigned short nolb, max_nolb, copied_nolb = 0; 659 660 if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE) 661 goto err_free; 662 663 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) 664 goto err_free; 665 666 src_dev = xop->src_dev; 667 dst_dev = xop->dst_dev; 668 src_lba = xop->src_lba; 669 dst_lba = xop->dst_lba; 670 nolb = xop->nolb; 671 end_lba = src_lba + nolb; 672 /* 673 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the 674 * smallest max_sectors between src_dev + dev_dev, or 675 */ 676 max_sectors = min(src_dev->dev_attrib.hw_max_sectors, 677 dst_dev->dev_attrib.hw_max_sectors); 678 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); 679 680 max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); 681 682 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", 683 nolb, max_nolb, (unsigned long long)end_lba); 684 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", 685 (unsigned long long)src_lba, (unsigned long long)dst_lba); 686 687 while (src_lba < end_lba) { 688 unsigned short cur_nolb = min(nolb, max_nolb); 689 u32 cur_bytes = cur_nolb * src_dev->dev_attrib.block_size; 690 691 if (cur_bytes != xop->xop_data_bytes) { 692 /* 693 * (Re)allocate a buffer large enough to hold the XCOPY 694 * I/O size, which can be reused each read / write loop. 695 */ 696 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); 697 rc = target_alloc_sgl(&xop->xop_data_sg, 698 &xop->xop_data_nents, 699 cur_bytes, 700 false, false); 701 if (rc < 0) 702 goto out; 703 xop->xop_data_bytes = cur_bytes; 704 } 705 706 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," 707 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); 708 709 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); 710 if (rc < 0) 711 goto out; 712 713 src_lba += cur_nolb; 714 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", 715 (unsigned long long)src_lba); 716 717 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," 718 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); 719 720 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, 721 dst_lba, cur_nolb); 722 if (rc < 0) 723 goto out; 724 725 dst_lba += cur_nolb; 726 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", 727 (unsigned long long)dst_lba); 728 729 copied_nolb += cur_nolb; 730 nolb -= cur_nolb; 731 } 732 733 xcopy_pt_undepend_remotedev(xop); 734 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); 735 kfree(xop); 736 737 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", 738 (unsigned long long)src_lba, (unsigned long long)dst_lba); 739 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", 740 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); 741 742 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); 743 target_complete_cmd(ec_cmd, SAM_STAT_GOOD); 744 return; 745 746 out: 747 xcopy_pt_undepend_remotedev(xop); 748 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); 749 750 err_free: 751 kfree(xop); 752 /* 753 * Don't override an error scsi status if it has already been set 754 */ 755 if (ec_cmd->scsi_status == SAM_STAT_GOOD) { 756 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY" 757 " CHECK_CONDITION -> sending response\n", rc); 758 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 759 } 760 target_complete_cmd(ec_cmd, ec_cmd->scsi_status); 761 } 762 763 /* 764 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing 765 * fails. 766 */ 767 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop) 768 { 769 struct se_cmd *se_cmd = xop->xop_se_cmd; 770 unsigned char *p = NULL, *seg_desc; 771 unsigned int list_id, list_id_usage, sdll, inline_dl; 772 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; 773 int rc; 774 unsigned short tdll; 775 776 p = transport_kmap_data_sg(se_cmd); 777 if (!p) { 778 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); 779 return TCM_OUT_OF_RESOURCES; 780 } 781 782 list_id = p[0]; 783 list_id_usage = (p[1] & 0x18) >> 3; 784 785 /* 786 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH 787 */ 788 tdll = get_unaligned_be16(&p[2]); 789 sdll = get_unaligned_be32(&p[8]); 790 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) { 791 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n", 792 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN); 793 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 794 goto out; 795 } 796 797 inline_dl = get_unaligned_be32(&p[12]); 798 if (inline_dl != 0) { 799 pr_err("XCOPY with non zero inline data length\n"); 800 goto out; 801 } 802 803 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) { 804 pr_err("XCOPY parameter truncation: data length %u too small " 805 "for tdll: %hu sdll: %u inline_dl: %u\n", 806 se_cmd->data_length, tdll, sdll, inline_dl); 807 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 808 goto out; 809 } 810 811 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" 812 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, 813 tdll, sdll, inline_dl); 814 815 /* 816 * skip over the target descriptors until segment descriptors 817 * have been passed - CSCD ids are needed to determine src and dest. 818 */ 819 seg_desc = &p[16] + tdll; 820 821 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, 822 sdll, &ret); 823 if (rc <= 0) 824 goto out; 825 826 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, 827 rc * XCOPY_SEGMENT_DESC_LEN); 828 829 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret); 830 if (rc <= 0) 831 goto out; 832 833 if (xop->src_dev->dev_attrib.block_size != 834 xop->dst_dev->dev_attrib.block_size) { 835 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" 836 " block_size: %u currently unsupported\n", 837 xop->src_dev->dev_attrib.block_size, 838 xop->dst_dev->dev_attrib.block_size); 839 xcopy_pt_undepend_remotedev(xop); 840 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 841 goto out; 842 } 843 844 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, 845 rc * XCOPY_TARGET_DESC_LEN); 846 transport_kunmap_data_sg(se_cmd); 847 return TCM_NO_SENSE; 848 849 out: 850 if (p) 851 transport_kunmap_data_sg(se_cmd); 852 return ret; 853 } 854 855 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) 856 { 857 struct se_device *dev = se_cmd->se_dev; 858 struct xcopy_op *xop; 859 unsigned int sa; 860 861 if (!dev->dev_attrib.emulate_3pc) { 862 pr_err("EXTENDED_COPY operation explicitly disabled\n"); 863 return TCM_UNSUPPORTED_SCSI_OPCODE; 864 } 865 866 sa = se_cmd->t_task_cdb[1] & 0x1f; 867 if (sa != 0x00) { 868 pr_err("EXTENDED_COPY(LID4) not supported\n"); 869 return TCM_UNSUPPORTED_SCSI_OPCODE; 870 } 871 872 if (se_cmd->data_length == 0) { 873 target_complete_cmd(se_cmd, SAM_STAT_GOOD); 874 return TCM_NO_SENSE; 875 } 876 if (se_cmd->data_length < XCOPY_HDR_LEN) { 877 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n", 878 se_cmd->data_length, XCOPY_HDR_LEN); 879 return TCM_PARAMETER_LIST_LENGTH_ERROR; 880 } 881 882 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); 883 if (!xop) 884 goto err; 885 xop->xop_se_cmd = se_cmd; 886 INIT_WORK(&xop->xop_work, target_xcopy_do_work); 887 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work))) 888 goto free; 889 return TCM_NO_SENSE; 890 891 free: 892 kfree(xop); 893 894 err: 895 return TCM_OUT_OF_RESOURCES; 896 } 897 898 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) 899 { 900 unsigned char *p; 901 902 p = transport_kmap_data_sg(se_cmd); 903 if (!p) { 904 pr_err("transport_kmap_data_sg failed in" 905 " target_rcr_operating_parameters\n"); 906 return TCM_OUT_OF_RESOURCES; 907 } 908 909 if (se_cmd->data_length < 54) { 910 pr_err("Receive Copy Results Op Parameters length" 911 " too small: %u\n", se_cmd->data_length); 912 transport_kunmap_data_sg(se_cmd); 913 return TCM_INVALID_CDB_FIELD; 914 } 915 /* 916 * Set SNLID=1 (Supports no List ID) 917 */ 918 p[4] = 0x1; 919 /* 920 * MAXIMUM TARGET DESCRIPTOR COUNT 921 */ 922 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); 923 /* 924 * MAXIMUM SEGMENT DESCRIPTOR COUNT 925 */ 926 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); 927 /* 928 * MAXIMUM DESCRIPTOR LIST LENGTH 929 */ 930 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); 931 /* 932 * MAXIMUM SEGMENT LENGTH 933 */ 934 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); 935 /* 936 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) 937 */ 938 put_unaligned_be32(0x0, &p[20]); 939 /* 940 * HELD DATA LIMIT 941 */ 942 put_unaligned_be32(0x0, &p[24]); 943 /* 944 * MAXIMUM STREAM DEVICE TRANSFER SIZE 945 */ 946 put_unaligned_be32(0x0, &p[28]); 947 /* 948 * TOTAL CONCURRENT COPIES 949 */ 950 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); 951 /* 952 * MAXIMUM CONCURRENT COPIES 953 */ 954 p[36] = RCR_OP_MAX_CONCURR_COPIES; 955 /* 956 * DATA SEGMENT GRANULARITY (log 2) 957 */ 958 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; 959 /* 960 * INLINE DATA GRANULARITY log 2) 961 */ 962 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; 963 /* 964 * HELD DATA GRANULARITY 965 */ 966 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; 967 /* 968 * IMPLEMENTED DESCRIPTOR LIST LENGTH 969 */ 970 p[43] = 0x2; 971 /* 972 * List of implemented descriptor type codes (ordered) 973 */ 974 p[44] = 0x02; /* Copy Block to Block device */ 975 p[45] = 0xe4; /* Identification descriptor target descriptor */ 976 977 /* 978 * AVAILABLE DATA (n-3) 979 */ 980 put_unaligned_be32(42, &p[0]); 981 982 transport_kunmap_data_sg(se_cmd); 983 target_complete_cmd(se_cmd, GOOD); 984 985 return TCM_NO_SENSE; 986 } 987 988 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) 989 { 990 unsigned char *cdb = &se_cmd->t_task_cdb[0]; 991 int sa = (cdb[1] & 0x1f), list_id = cdb[2]; 992 sense_reason_t rc = TCM_NO_SENSE; 993 994 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" 995 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); 996 997 if (list_id != 0) { 998 pr_err("Receive Copy Results with non zero list identifier" 999 " not supported\n"); 1000 return TCM_INVALID_CDB_FIELD; 1001 } 1002 1003 switch (sa) { 1004 case RCR_SA_OPERATING_PARAMETERS: 1005 rc = target_rcr_operating_parameters(se_cmd); 1006 break; 1007 case RCR_SA_COPY_STATUS: 1008 case RCR_SA_RECEIVE_DATA: 1009 case RCR_SA_FAILED_SEGMENT_DETAILS: 1010 default: 1011 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); 1012 return TCM_INVALID_CDB_FIELD; 1013 } 1014 1015 return rc; 1016 } 1017