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 /** 37 * target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers 38 * 39 * @se_dev: device being considered for match 40 * @dev_wwn: XCOPY requested NAA dev_wwn 41 * @return: 1 on match, 0 on no-match 42 */ 43 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev, 44 const unsigned char *dev_wwn) 45 { 46 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN]; 47 int rc; 48 49 if (!se_dev->dev_attrib.emulate_3pc) { 50 pr_debug("XCOPY: emulate_3pc disabled on se_dev %p\n", se_dev); 51 return 0; 52 } 53 54 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 55 spc_gen_naa_6h_vendor_specific(se_dev, &tmp_dev_wwn[0]); 56 57 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); 58 if (rc != 0) { 59 pr_debug("XCOPY: skip non-matching: %*ph\n", 60 XCOPY_NAA_IEEE_REGEX_LEN, tmp_dev_wwn); 61 return 0; 62 } 63 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev); 64 65 return 1; 66 } 67 68 static int target_xcopy_locate_se_dev_e4(struct se_session *sess, 69 const unsigned char *dev_wwn, 70 struct se_device **_found_dev, 71 struct percpu_ref **_found_lun_ref) 72 { 73 struct se_dev_entry *deve; 74 struct se_node_acl *nacl; 75 struct se_lun *this_lun = NULL; 76 struct se_device *found_dev = NULL; 77 78 /* cmd with NULL sess indicates no associated $FABRIC_MOD */ 79 if (!sess) 80 goto err_out; 81 82 pr_debug("XCOPY 0xe4: searching for: %*ph\n", 83 XCOPY_NAA_IEEE_REGEX_LEN, dev_wwn); 84 85 nacl = sess->se_node_acl; 86 rcu_read_lock(); 87 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 88 struct se_device *this_dev; 89 int rc; 90 91 this_lun = deve->se_lun; 92 this_dev = rcu_dereference_raw(this_lun->lun_se_dev); 93 94 rc = target_xcopy_locate_se_dev_e4_iter(this_dev, dev_wwn); 95 if (rc) { 96 if (percpu_ref_tryget_live(&this_lun->lun_ref)) 97 found_dev = this_dev; 98 break; 99 } 100 } 101 rcu_read_unlock(); 102 if (found_dev == NULL) 103 goto err_out; 104 105 pr_debug("lun_ref held for se_dev: %p se_dev->se_dev_group: %p\n", 106 found_dev, &found_dev->dev_group); 107 *_found_dev = found_dev; 108 *_found_lun_ref = &this_lun->lun_ref; 109 return 0; 110 err_out: 111 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n"); 112 return -EINVAL; 113 } 114 115 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, 116 unsigned char *p, unsigned short cscd_index) 117 { 118 unsigned char *desc = p; 119 unsigned short ript; 120 u8 desig_len; 121 /* 122 * Extract RELATIVE INITIATOR PORT IDENTIFIER 123 */ 124 ript = get_unaligned_be16(&desc[2]); 125 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript); 126 /* 127 * Check for supported code set, association, and designator type 128 */ 129 if ((desc[4] & 0x0f) != 0x1) { 130 pr_err("XCOPY 0xe4: code set of non binary type not supported\n"); 131 return -EINVAL; 132 } 133 if ((desc[5] & 0x30) != 0x00) { 134 pr_err("XCOPY 0xe4: association other than LUN not supported\n"); 135 return -EINVAL; 136 } 137 if ((desc[5] & 0x0f) != 0x3) { 138 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n", 139 (desc[5] & 0x0f)); 140 return -EINVAL; 141 } 142 /* 143 * Check for matching 16 byte length for NAA IEEE Registered Extended 144 * Assigned designator 145 */ 146 desig_len = desc[7]; 147 if (desig_len != XCOPY_NAA_IEEE_REGEX_LEN) { 148 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len); 149 return -EINVAL; 150 } 151 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len); 152 /* 153 * Check for NAA IEEE Registered Extended Assigned header.. 154 */ 155 if ((desc[8] & 0xf0) != 0x60) { 156 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n", 157 (desc[8] & 0xf0)); 158 return -EINVAL; 159 } 160 161 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) { 162 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor " 163 "dest\n", cscd_index); 164 return 0; 165 } 166 167 if (cscd_index == xop->stdi) { 168 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 169 /* 170 * Determine if the source designator matches the local device 171 */ 172 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0], 173 XCOPY_NAA_IEEE_REGEX_LEN)) { 174 xop->op_origin = XCOL_SOURCE_RECV_OP; 175 xop->src_dev = se_cmd->se_dev; 176 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source" 177 " received xop\n", xop->src_dev); 178 } 179 } 180 181 if (cscd_index == xop->dtdi) { 182 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 183 /* 184 * Determine if the destination designator matches the local 185 * device. If @cscd_index corresponds to both source (stdi) and 186 * destination (dtdi), or dtdi comes after stdi, then 187 * XCOL_DEST_RECV_OP wins. 188 */ 189 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0], 190 XCOPY_NAA_IEEE_REGEX_LEN)) { 191 xop->op_origin = XCOL_DEST_RECV_OP; 192 xop->dst_dev = se_cmd->se_dev; 193 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination" 194 " received xop\n", xop->dst_dev); 195 } 196 } 197 198 return 0; 199 } 200 201 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd, 202 struct xcopy_op *xop, unsigned char *p, 203 unsigned short tdll, sense_reason_t *sense_ret) 204 { 205 struct se_device *local_dev = se_cmd->se_dev; 206 unsigned char *desc = p; 207 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc; 208 unsigned short cscd_index = 0; 209 unsigned short start = 0; 210 211 *sense_ret = TCM_INVALID_PARAMETER_LIST; 212 213 if (offset != 0) { 214 pr_err("XCOPY target descriptor list length is not" 215 " multiple of %d\n", XCOPY_TARGET_DESC_LEN); 216 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 217 return -EINVAL; 218 } 219 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) { 220 pr_err("XCOPY target descriptor supports a maximum" 221 " two src/dest descriptors, tdll: %hu too large..\n", tdll); 222 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */ 223 *sense_ret = TCM_TOO_MANY_TARGET_DESCS; 224 return -EINVAL; 225 } 226 /* 227 * Generate an IEEE Registered Extended designator based upon the 228 * se_device the XCOPY was received upon.. 229 */ 230 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 231 spc_gen_naa_6h_vendor_specific(local_dev, &xop->local_dev_wwn[0]); 232 233 while (start < tdll) { 234 /* 235 * Check target descriptor identification with 0xE4 type, and 236 * compare the current index with the CSCD descriptor IDs in 237 * the segment descriptor. Use VPD 0x83 WWPN matching .. 238 */ 239 switch (desc[0]) { 240 case 0xe4: 241 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop, 242 &desc[0], cscd_index); 243 if (rc != 0) 244 goto out; 245 start += XCOPY_TARGET_DESC_LEN; 246 desc += XCOPY_TARGET_DESC_LEN; 247 cscd_index++; 248 break; 249 default: 250 pr_err("XCOPY unsupported descriptor type code:" 251 " 0x%02x\n", desc[0]); 252 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 253 goto out; 254 } 255 } 256 257 switch (xop->op_origin) { 258 case XCOL_SOURCE_RECV_OP: 259 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess, 260 xop->dst_tid_wwn, 261 &xop->dst_dev, 262 &xop->remote_lun_ref); 263 break; 264 case XCOL_DEST_RECV_OP: 265 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess, 266 xop->src_tid_wwn, 267 &xop->src_dev, 268 &xop->remote_lun_ref); 269 break; 270 default: 271 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - " 272 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi); 273 rc = -EINVAL; 274 break; 275 } 276 /* 277 * If a matching IEEE NAA 0x83 descriptor for the requested device 278 * is not located on this node, return COPY_ABORTED with ASQ/ASQC 279 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the 280 * initiator to fall back to normal copy method. 281 */ 282 if (rc < 0) { 283 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE; 284 goto out; 285 } 286 287 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n", 288 xop->src_dev, &xop->src_tid_wwn[0]); 289 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n", 290 xop->dst_dev, &xop->dst_tid_wwn[0]); 291 292 return cscd_index; 293 294 out: 295 return -EINVAL; 296 } 297 298 static int target_xcopy_parse_segdesc_02(struct xcopy_op *xop, unsigned char *p) 299 { 300 unsigned char *desc = p; 301 int dc = (desc[1] & 0x02); 302 unsigned short desc_len; 303 304 desc_len = get_unaligned_be16(&desc[2]); 305 if (desc_len != 0x18) { 306 pr_err("XCOPY segment desc 0x02: Illegal desc_len:" 307 " %hu\n", desc_len); 308 return -EINVAL; 309 } 310 311 xop->stdi = get_unaligned_be16(&desc[4]); 312 xop->dtdi = get_unaligned_be16(&desc[6]); 313 314 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX || 315 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) { 316 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n", 317 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi); 318 return -EINVAL; 319 } 320 321 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n", 322 desc_len, xop->stdi, xop->dtdi, dc); 323 324 xop->nolb = get_unaligned_be16(&desc[10]); 325 xop->src_lba = get_unaligned_be64(&desc[12]); 326 xop->dst_lba = get_unaligned_be64(&desc[20]); 327 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n", 328 xop->nolb, (unsigned long long)xop->src_lba, 329 (unsigned long long)xop->dst_lba); 330 331 return 0; 332 } 333 334 static int target_xcopy_parse_segment_descriptors(struct xcopy_op *xop, 335 unsigned char *p, unsigned int sdll, 336 sense_reason_t *sense_ret) 337 { 338 unsigned char *desc = p; 339 unsigned int start = 0; 340 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; 341 342 *sense_ret = TCM_INVALID_PARAMETER_LIST; 343 344 if (offset != 0) { 345 pr_err("XCOPY segment descriptor list length is not" 346 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); 347 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 348 return -EINVAL; 349 } 350 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) { 351 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too" 352 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll); 353 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */ 354 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS; 355 return -EINVAL; 356 } 357 358 while (start < sdll) { 359 /* 360 * Check segment descriptor type code for block -> block 361 */ 362 switch (desc[0]) { 363 case 0x02: 364 rc = target_xcopy_parse_segdesc_02(xop, desc); 365 if (rc < 0) 366 goto out; 367 368 ret++; 369 start += XCOPY_SEGMENT_DESC_LEN; 370 desc += XCOPY_SEGMENT_DESC_LEN; 371 break; 372 default: 373 pr_err("XCOPY unsupported segment descriptor" 374 "type: 0x%02x\n", desc[0]); 375 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 376 goto out; 377 } 378 } 379 380 return ret; 381 382 out: 383 return -EINVAL; 384 } 385 386 /* 387 * Start xcopy_pt ops 388 */ 389 390 struct xcopy_pt_cmd { 391 struct se_cmd se_cmd; 392 struct completion xpt_passthrough_sem; 393 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; 394 }; 395 396 struct se_portal_group xcopy_pt_tpg; 397 static struct se_session xcopy_pt_sess; 398 static struct se_node_acl xcopy_pt_nacl; 399 400 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) 401 { 402 return 0; 403 } 404 405 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) 406 { 407 if (xop->op_origin == XCOL_SOURCE_RECV_OP) 408 pr_debug("putting dst lun_ref for %p\n", xop->dst_dev); 409 else 410 pr_debug("putting src lun_ref for %p\n", xop->src_dev); 411 412 percpu_ref_put(xop->remote_lun_ref); 413 } 414 415 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) 416 { 417 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 418 struct xcopy_pt_cmd, se_cmd); 419 420 /* xpt_cmd is on the stack, nothing to free here */ 421 pr_debug("xpt_cmd done: %p\n", xpt_cmd); 422 } 423 424 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd) 425 { 426 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 427 struct xcopy_pt_cmd, se_cmd); 428 429 complete(&xpt_cmd->xpt_passthrough_sem); 430 return 0; 431 } 432 433 static int xcopy_pt_write_pending(struct se_cmd *se_cmd) 434 { 435 return 0; 436 } 437 438 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) 439 { 440 return 0; 441 } 442 443 static int xcopy_pt_queue_status(struct se_cmd *se_cmd) 444 { 445 return 0; 446 } 447 448 static const struct target_core_fabric_ops xcopy_pt_tfo = { 449 .fabric_name = "xcopy-pt", 450 .get_cmd_state = xcopy_pt_get_cmd_state, 451 .release_cmd = xcopy_pt_release_cmd, 452 .check_stop_free = xcopy_pt_check_stop_free, 453 .write_pending = xcopy_pt_write_pending, 454 .queue_data_in = xcopy_pt_queue_data_in, 455 .queue_status = xcopy_pt_queue_status, 456 }; 457 458 /* 459 * End xcopy_pt_ops 460 */ 461 462 int target_xcopy_setup_pt(void) 463 { 464 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0); 465 if (!xcopy_wq) { 466 pr_err("Unable to allocate xcopy_wq\n"); 467 return -ENOMEM; 468 } 469 470 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); 471 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); 472 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); 473 474 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; 475 476 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); 477 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); 478 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); 479 memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); 480 transport_init_session(&xcopy_pt_sess); 481 482 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; 483 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; 484 485 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; 486 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; 487 488 return 0; 489 } 490 491 void target_xcopy_release_pt(void) 492 { 493 if (xcopy_wq) 494 destroy_workqueue(xcopy_wq); 495 } 496 497 /* 498 * target_xcopy_setup_pt_cmd - set up a pass-through command 499 * @xpt_cmd: Data structure to initialize. 500 * @xop: Describes the XCOPY operation received from an initiator. 501 * @se_dev: Backend device to associate with @xpt_cmd if 502 * @remote_port == true. 503 * @cdb: SCSI CDB to be copied into @xpt_cmd. 504 * @remote_port: If false, use the LUN through which the XCOPY command has 505 * been received. If true, use @se_dev->xcopy_lun. 506 * 507 * Set up a SCSI command (READ or WRITE) that will be used to execute an 508 * XCOPY command. 509 */ 510 static int target_xcopy_setup_pt_cmd( 511 struct xcopy_pt_cmd *xpt_cmd, 512 struct xcopy_op *xop, 513 struct se_device *se_dev, 514 unsigned char *cdb, 515 bool remote_port) 516 { 517 struct se_cmd *cmd = &xpt_cmd->se_cmd; 518 519 /* 520 * Setup LUN+port to honor reservations based upon xop->op_origin for 521 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. 522 */ 523 if (remote_port) { 524 cmd->se_lun = &se_dev->xcopy_lun; 525 cmd->se_dev = se_dev; 526 } else { 527 cmd->se_lun = xop->xop_se_cmd->se_lun; 528 cmd->se_dev = xop->xop_se_cmd->se_dev; 529 } 530 cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 531 532 if (target_cmd_init_cdb(cmd, cdb, GFP_KERNEL)) 533 return -EINVAL; 534 535 cmd->tag = 0; 536 if (target_cmd_parse_cdb(cmd)) 537 return -EINVAL; 538 539 if (transport_generic_map_mem_to_cmd(cmd, xop->xop_data_sg, 540 xop->xop_data_nents, NULL, 0)) 541 return -EINVAL; 542 543 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" 544 " %u\n", cmd->t_data_sg, cmd->t_data_nents); 545 546 return 0; 547 } 548 549 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) 550 { 551 struct se_cmd *se_cmd = &xpt_cmd->se_cmd; 552 sense_reason_t sense_rc; 553 554 sense_rc = transport_generic_new_cmd(se_cmd); 555 if (sense_rc) 556 return -EINVAL; 557 558 if (se_cmd->data_direction == DMA_TO_DEVICE) 559 target_execute_cmd(se_cmd); 560 561 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); 562 563 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", 564 se_cmd->scsi_status); 565 566 return (se_cmd->scsi_status) ? -EINVAL : 0; 567 } 568 569 static int target_xcopy_read_source( 570 struct se_cmd *ec_cmd, 571 struct xcopy_op *xop, 572 struct se_device *src_dev, 573 sector_t src_lba, 574 u32 src_bytes) 575 { 576 struct xcopy_pt_cmd xpt_cmd; 577 struct se_cmd *se_cmd = &xpt_cmd.se_cmd; 578 u32 transfer_length_block = src_bytes / src_dev->dev_attrib.block_size; 579 int rc; 580 unsigned char cdb[16]; 581 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); 582 583 memset(&xpt_cmd, 0, sizeof(xpt_cmd)); 584 init_completion(&xpt_cmd.xpt_passthrough_sem); 585 586 memset(&cdb[0], 0, 16); 587 cdb[0] = READ_16; 588 put_unaligned_be64(src_lba, &cdb[2]); 589 put_unaligned_be32(transfer_length_block, &cdb[10]); 590 pr_debug("XCOPY: Built READ_16: LBA: %llu Blocks: %u Length: %u\n", 591 (unsigned long long)src_lba, transfer_length_block, src_bytes); 592 593 __target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, src_bytes, 594 DMA_FROM_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0, 595 NULL); 596 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, src_dev, &cdb[0], 597 remote_port); 598 if (rc < 0) { 599 ec_cmd->scsi_status = se_cmd->scsi_status; 600 goto out; 601 } 602 603 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" 604 " memory\n", xop->xop_data_sg, xop->xop_data_nents); 605 606 rc = target_xcopy_issue_pt_cmd(&xpt_cmd); 607 if (rc < 0) 608 ec_cmd->scsi_status = se_cmd->scsi_status; 609 out: 610 transport_generic_free_cmd(se_cmd, 0); 611 return rc; 612 } 613 614 static int target_xcopy_write_destination( 615 struct se_cmd *ec_cmd, 616 struct xcopy_op *xop, 617 struct se_device *dst_dev, 618 sector_t dst_lba, 619 u32 dst_bytes) 620 { 621 struct xcopy_pt_cmd xpt_cmd; 622 struct se_cmd *se_cmd = &xpt_cmd.se_cmd; 623 u32 transfer_length_block = dst_bytes / dst_dev->dev_attrib.block_size; 624 int rc; 625 unsigned char cdb[16]; 626 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); 627 628 memset(&xpt_cmd, 0, sizeof(xpt_cmd)); 629 init_completion(&xpt_cmd.xpt_passthrough_sem); 630 631 memset(&cdb[0], 0, 16); 632 cdb[0] = WRITE_16; 633 put_unaligned_be64(dst_lba, &cdb[2]); 634 put_unaligned_be32(transfer_length_block, &cdb[10]); 635 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Blocks: %u Length: %u\n", 636 (unsigned long long)dst_lba, transfer_length_block, dst_bytes); 637 638 __target_init_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, dst_bytes, 639 DMA_TO_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0, 640 NULL); 641 rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, dst_dev, &cdb[0], 642 remote_port); 643 if (rc < 0) { 644 ec_cmd->scsi_status = se_cmd->scsi_status; 645 goto out; 646 } 647 648 rc = target_xcopy_issue_pt_cmd(&xpt_cmd); 649 if (rc < 0) 650 ec_cmd->scsi_status = se_cmd->scsi_status; 651 out: 652 transport_generic_free_cmd(se_cmd, 0); 653 return rc; 654 } 655 656 static void target_xcopy_do_work(struct work_struct *work) 657 { 658 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); 659 struct se_cmd *ec_cmd = xop->xop_se_cmd; 660 struct se_device *src_dev, *dst_dev; 661 sector_t src_lba, dst_lba, end_lba; 662 unsigned long long max_bytes, max_bytes_src, max_bytes_dst, max_blocks; 663 int rc = 0; 664 unsigned short nolb; 665 unsigned int copied_bytes = 0; 666 sense_reason_t sense_rc; 667 668 sense_rc = target_parse_xcopy_cmd(xop); 669 if (sense_rc != TCM_NO_SENSE) 670 goto err_free; 671 672 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) { 673 sense_rc = TCM_INVALID_PARAMETER_LIST; 674 goto err_free; 675 } 676 677 src_dev = xop->src_dev; 678 dst_dev = xop->dst_dev; 679 src_lba = xop->src_lba; 680 dst_lba = xop->dst_lba; 681 nolb = xop->nolb; 682 end_lba = src_lba + nolb; 683 /* 684 * Break up XCOPY I/O into hw_max_sectors * hw_block_size sized 685 * I/O based on the smallest max_bytes between src_dev + dst_dev 686 */ 687 max_bytes_src = (unsigned long long) src_dev->dev_attrib.hw_max_sectors * 688 src_dev->dev_attrib.hw_block_size; 689 max_bytes_dst = (unsigned long long) dst_dev->dev_attrib.hw_max_sectors * 690 dst_dev->dev_attrib.hw_block_size; 691 692 max_bytes = min_t(u64, max_bytes_src, max_bytes_dst); 693 max_bytes = min_t(u64, max_bytes, XCOPY_MAX_BYTES); 694 695 /* 696 * Using shift instead of the division because otherwise GCC 697 * generates __udivdi3 that is missing on i386 698 */ 699 max_blocks = max_bytes >> ilog2(src_dev->dev_attrib.block_size); 700 701 pr_debug("%s: nolb: %u, max_blocks: %llu end_lba: %llu\n", __func__, 702 nolb, max_blocks, (unsigned long long)end_lba); 703 pr_debug("%s: Starting src_lba: %llu, dst_lba: %llu\n", __func__, 704 (unsigned long long)src_lba, (unsigned long long)dst_lba); 705 706 while (nolb) { 707 u32 cur_bytes = min_t(u64, max_bytes, nolb * src_dev->dev_attrib.block_size); 708 unsigned short cur_nolb = cur_bytes / src_dev->dev_attrib.block_size; 709 710 if (cur_bytes != xop->xop_data_bytes) { 711 /* 712 * (Re)allocate a buffer large enough to hold the XCOPY 713 * I/O size, which can be reused each read / write loop. 714 */ 715 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); 716 rc = target_alloc_sgl(&xop->xop_data_sg, 717 &xop->xop_data_nents, 718 cur_bytes, 719 false, false); 720 if (rc < 0) 721 goto out; 722 xop->xop_data_bytes = cur_bytes; 723 } 724 725 pr_debug("%s: Calling read src_dev: %p src_lba: %llu, cur_nolb: %hu\n", 726 __func__, src_dev, (unsigned long long)src_lba, cur_nolb); 727 728 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_bytes); 729 if (rc < 0) 730 goto out; 731 732 src_lba += cur_bytes / src_dev->dev_attrib.block_size; 733 pr_debug("%s: Incremented READ src_lba to %llu\n", __func__, 734 (unsigned long long)src_lba); 735 736 pr_debug("%s: Calling write dst_dev: %p dst_lba: %llu, cur_nolb: %u\n", 737 __func__, dst_dev, (unsigned long long)dst_lba, cur_nolb); 738 739 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, 740 dst_lba, cur_bytes); 741 if (rc < 0) 742 goto out; 743 744 dst_lba += cur_bytes / dst_dev->dev_attrib.block_size; 745 pr_debug("%s: Incremented WRITE dst_lba to %llu\n", __func__, 746 (unsigned long long)dst_lba); 747 748 copied_bytes += cur_bytes; 749 nolb -= cur_bytes / src_dev->dev_attrib.block_size; 750 } 751 752 xcopy_pt_undepend_remotedev(xop); 753 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); 754 kfree(xop); 755 756 pr_debug("%s: Final src_lba: %llu, dst_lba: %llu\n", __func__, 757 (unsigned long long)src_lba, (unsigned long long)dst_lba); 758 pr_debug("%s: Blocks copied: %u, Bytes Copied: %u\n", __func__, 759 copied_bytes / dst_dev->dev_attrib.block_size, copied_bytes); 760 761 pr_debug("%s: Setting X-COPY GOOD status -> sending response\n", __func__); 762 target_complete_cmd(ec_cmd, SAM_STAT_GOOD); 763 return; 764 765 out: 766 /* 767 * The XCOPY command was aborted after some data was transferred. 768 * Terminate command with CHECK CONDITION status, with the sense key 769 * set to COPY ABORTED. 770 */ 771 sense_rc = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE; 772 xcopy_pt_undepend_remotedev(xop); 773 target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); 774 775 err_free: 776 kfree(xop); 777 pr_warn_ratelimited("%s: rc: %d, sense: %u, XCOPY operation failed\n", 778 __func__, rc, sense_rc); 779 target_complete_cmd_with_sense(ec_cmd, SAM_STAT_CHECK_CONDITION, sense_rc); 780 } 781 782 /* 783 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing 784 * fails. 785 */ 786 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop) 787 { 788 struct se_cmd *se_cmd = xop->xop_se_cmd; 789 unsigned char *p = NULL, *seg_desc; 790 unsigned int list_id, list_id_usage, sdll, inline_dl; 791 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; 792 int rc; 793 unsigned short tdll; 794 795 p = transport_kmap_data_sg(se_cmd); 796 if (!p) { 797 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); 798 return TCM_OUT_OF_RESOURCES; 799 } 800 801 list_id = p[0]; 802 list_id_usage = (p[1] & 0x18) >> 3; 803 804 /* 805 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH 806 */ 807 tdll = get_unaligned_be16(&p[2]); 808 sdll = get_unaligned_be32(&p[8]); 809 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) { 810 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n", 811 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN); 812 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 813 goto out; 814 } 815 816 inline_dl = get_unaligned_be32(&p[12]); 817 if (inline_dl != 0) { 818 pr_err("XCOPY with non zero inline data length\n"); 819 goto out; 820 } 821 822 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) { 823 pr_err("XCOPY parameter truncation: data length %u too small " 824 "for tdll: %hu sdll: %u inline_dl: %u\n", 825 se_cmd->data_length, tdll, sdll, inline_dl); 826 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 827 goto out; 828 } 829 830 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" 831 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, 832 tdll, sdll, inline_dl); 833 834 /* 835 * skip over the target descriptors until segment descriptors 836 * have been passed - CSCD ids are needed to determine src and dest. 837 */ 838 seg_desc = &p[16] + tdll; 839 840 rc = target_xcopy_parse_segment_descriptors(xop, seg_desc, sdll, &ret); 841 if (rc <= 0) 842 goto out; 843 844 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, 845 rc * XCOPY_SEGMENT_DESC_LEN); 846 847 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret); 848 if (rc <= 0) 849 goto out; 850 851 if (xop->src_dev->dev_attrib.block_size != 852 xop->dst_dev->dev_attrib.block_size) { 853 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" 854 " block_size: %u currently unsupported\n", 855 xop->src_dev->dev_attrib.block_size, 856 xop->dst_dev->dev_attrib.block_size); 857 xcopy_pt_undepend_remotedev(xop); 858 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 859 goto out; 860 } 861 862 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, 863 rc * XCOPY_TARGET_DESC_LEN); 864 transport_kunmap_data_sg(se_cmd); 865 return TCM_NO_SENSE; 866 867 out: 868 if (p) 869 transport_kunmap_data_sg(se_cmd); 870 return ret; 871 } 872 873 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) 874 { 875 struct se_device *dev = se_cmd->se_dev; 876 struct xcopy_op *xop; 877 unsigned int sa; 878 879 if (!dev->dev_attrib.emulate_3pc) { 880 pr_err("EXTENDED_COPY operation explicitly disabled\n"); 881 return TCM_UNSUPPORTED_SCSI_OPCODE; 882 } 883 884 sa = se_cmd->t_task_cdb[1] & 0x1f; 885 if (sa != 0x00) { 886 pr_err("EXTENDED_COPY(LID4) not supported\n"); 887 return TCM_UNSUPPORTED_SCSI_OPCODE; 888 } 889 890 if (se_cmd->data_length == 0) { 891 target_complete_cmd(se_cmd, SAM_STAT_GOOD); 892 return TCM_NO_SENSE; 893 } 894 if (se_cmd->data_length < XCOPY_HDR_LEN) { 895 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n", 896 se_cmd->data_length, XCOPY_HDR_LEN); 897 return TCM_PARAMETER_LIST_LENGTH_ERROR; 898 } 899 900 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); 901 if (!xop) 902 goto err; 903 xop->xop_se_cmd = se_cmd; 904 INIT_WORK(&xop->xop_work, target_xcopy_do_work); 905 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work))) 906 goto free; 907 return TCM_NO_SENSE; 908 909 free: 910 kfree(xop); 911 912 err: 913 return TCM_OUT_OF_RESOURCES; 914 } 915 916 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) 917 { 918 unsigned char *p; 919 920 p = transport_kmap_data_sg(se_cmd); 921 if (!p) { 922 pr_err("transport_kmap_data_sg failed in" 923 " target_rcr_operating_parameters\n"); 924 return TCM_OUT_OF_RESOURCES; 925 } 926 927 if (se_cmd->data_length < 54) { 928 pr_err("Receive Copy Results Op Parameters length" 929 " too small: %u\n", se_cmd->data_length); 930 transport_kunmap_data_sg(se_cmd); 931 return TCM_INVALID_CDB_FIELD; 932 } 933 /* 934 * Set SNLID=1 (Supports no List ID) 935 */ 936 p[4] = 0x1; 937 /* 938 * MAXIMUM TARGET DESCRIPTOR COUNT 939 */ 940 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); 941 /* 942 * MAXIMUM SEGMENT DESCRIPTOR COUNT 943 */ 944 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); 945 /* 946 * MAXIMUM DESCRIPTOR LIST LENGTH 947 */ 948 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); 949 /* 950 * MAXIMUM SEGMENT LENGTH 951 */ 952 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); 953 /* 954 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) 955 */ 956 put_unaligned_be32(0x0, &p[20]); 957 /* 958 * HELD DATA LIMIT 959 */ 960 put_unaligned_be32(0x0, &p[24]); 961 /* 962 * MAXIMUM STREAM DEVICE TRANSFER SIZE 963 */ 964 put_unaligned_be32(0x0, &p[28]); 965 /* 966 * TOTAL CONCURRENT COPIES 967 */ 968 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); 969 /* 970 * MAXIMUM CONCURRENT COPIES 971 */ 972 p[36] = RCR_OP_MAX_CONCURR_COPIES; 973 /* 974 * DATA SEGMENT GRANULARITY (log 2) 975 */ 976 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; 977 /* 978 * INLINE DATA GRANULARITY log 2) 979 */ 980 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; 981 /* 982 * HELD DATA GRANULARITY 983 */ 984 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; 985 /* 986 * IMPLEMENTED DESCRIPTOR LIST LENGTH 987 */ 988 p[43] = 0x2; 989 /* 990 * List of implemented descriptor type codes (ordered) 991 */ 992 p[44] = 0x02; /* Copy Block to Block device */ 993 p[45] = 0xe4; /* Identification descriptor target descriptor */ 994 995 /* 996 * AVAILABLE DATA (n-3) 997 */ 998 put_unaligned_be32(42, &p[0]); 999 1000 transport_kunmap_data_sg(se_cmd); 1001 target_complete_cmd(se_cmd, SAM_STAT_GOOD); 1002 1003 return TCM_NO_SENSE; 1004 } 1005 1006 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) 1007 { 1008 unsigned char *cdb = &se_cmd->t_task_cdb[0]; 1009 int sa = (cdb[1] & 0x1f), list_id = cdb[2]; 1010 struct se_device *dev = se_cmd->se_dev; 1011 sense_reason_t rc = TCM_NO_SENSE; 1012 1013 if (!dev->dev_attrib.emulate_3pc) { 1014 pr_debug("Third-party copy operations explicitly disabled\n"); 1015 return TCM_UNSUPPORTED_SCSI_OPCODE; 1016 } 1017 1018 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" 1019 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); 1020 1021 if (list_id != 0) { 1022 pr_err("Receive Copy Results with non zero list identifier" 1023 " not supported\n"); 1024 return TCM_INVALID_CDB_FIELD; 1025 } 1026 1027 switch (sa) { 1028 case RCR_SA_OPERATING_PARAMETERS: 1029 rc = target_rcr_operating_parameters(se_cmd); 1030 break; 1031 case RCR_SA_COPY_STATUS: 1032 case RCR_SA_RECEIVE_DATA: 1033 case RCR_SA_FAILED_SEGMENT_DETAILS: 1034 default: 1035 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); 1036 return TCM_INVALID_CDB_FIELD; 1037 } 1038 1039 return rc; 1040 } 1041