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