1 /******************************************************************************* 2 * Filename: target_core_xcopy.c 3 * 4 * This file contains support for SPC-4 Extended-Copy offload with generic 5 * TCM backends. 6 * 7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved. 8 * 9 * Author: 10 * Nicholas A. Bellinger <nab@daterainc.com> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 ******************************************************************************/ 23 24 #include <linux/slab.h> 25 #include <linux/spinlock.h> 26 #include <linux/list.h> 27 #include <linux/configfs.h> 28 #include <linux/ratelimit.h> 29 #include <scsi/scsi_proto.h> 30 #include <asm/unaligned.h> 31 32 #include <target/target_core_base.h> 33 #include <target/target_core_backend.h> 34 #include <target/target_core_fabric.h> 35 36 #include "target_core_internal.h" 37 #include "target_core_pr.h" 38 #include "target_core_ua.h" 39 #include "target_core_xcopy.h" 40 41 static struct workqueue_struct *xcopy_wq = NULL; 42 43 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop); 44 45 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf) 46 { 47 int off = 0; 48 49 buf[off++] = (0x6 << 4); 50 buf[off++] = 0x01; 51 buf[off++] = 0x40; 52 buf[off] = (0x5 << 4); 53 54 spc_parse_naa_6h_vendor_specific(dev, &buf[off]); 55 return 0; 56 } 57 58 struct xcopy_dev_search_info { 59 const unsigned char *dev_wwn; 60 struct se_device *found_dev; 61 }; 62 63 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev, 64 void *data) 65 { 66 struct xcopy_dev_search_info *info = data; 67 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN]; 68 int rc; 69 70 if (!se_dev->dev_attrib.emulate_3pc) 71 return 0; 72 73 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 74 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]); 75 76 rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); 77 if (rc != 0) 78 return 0; 79 80 info->found_dev = se_dev; 81 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev); 82 83 rc = target_depend_item(&se_dev->dev_group.cg_item); 84 if (rc != 0) { 85 pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n", 86 rc, se_dev); 87 return rc; 88 } 89 90 pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n", 91 se_dev, &se_dev->dev_group); 92 return 1; 93 } 94 95 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn, 96 struct se_device **found_dev) 97 { 98 struct xcopy_dev_search_info info; 99 int ret; 100 101 memset(&info, 0, sizeof(info)); 102 info.dev_wwn = dev_wwn; 103 104 ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info); 105 if (ret == 1) { 106 *found_dev = info.found_dev; 107 return 0; 108 } else { 109 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n"); 110 return -EINVAL; 111 } 112 } 113 114 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, 115 unsigned char *p, unsigned short cscd_index) 116 { 117 unsigned char *desc = p; 118 unsigned short ript; 119 u8 desig_len; 120 /* 121 * Extract RELATIVE INITIATOR PORT IDENTIFIER 122 */ 123 ript = get_unaligned_be16(&desc[2]); 124 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript); 125 /* 126 * Check for supported code set, association, and designator type 127 */ 128 if ((desc[4] & 0x0f) != 0x1) { 129 pr_err("XCOPY 0xe4: code set of non binary type not supported\n"); 130 return -EINVAL; 131 } 132 if ((desc[5] & 0x30) != 0x00) { 133 pr_err("XCOPY 0xe4: association other than LUN not supported\n"); 134 return -EINVAL; 135 } 136 if ((desc[5] & 0x0f) != 0x3) { 137 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n", 138 (desc[5] & 0x0f)); 139 return -EINVAL; 140 } 141 /* 142 * Check for matching 16 byte length for NAA IEEE Registered Extended 143 * Assigned designator 144 */ 145 desig_len = desc[7]; 146 if (desig_len != 16) { 147 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len); 148 return -EINVAL; 149 } 150 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len); 151 /* 152 * Check for NAA IEEE Registered Extended Assigned header.. 153 */ 154 if ((desc[8] & 0xf0) != 0x60) { 155 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n", 156 (desc[8] & 0xf0)); 157 return -EINVAL; 158 } 159 160 if (cscd_index != xop->stdi && cscd_index != xop->dtdi) { 161 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor " 162 "dest\n", cscd_index); 163 return 0; 164 } 165 166 if (cscd_index == xop->stdi) { 167 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 168 /* 169 * Determine if the source designator matches the local device 170 */ 171 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0], 172 XCOPY_NAA_IEEE_REGEX_LEN)) { 173 xop->op_origin = XCOL_SOURCE_RECV_OP; 174 xop->src_dev = se_cmd->se_dev; 175 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source" 176 " received xop\n", xop->src_dev); 177 } 178 } 179 180 if (cscd_index == xop->dtdi) { 181 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 182 /* 183 * Determine if the destination designator matches the local 184 * device. If @cscd_index corresponds to both source (stdi) and 185 * destination (dtdi), or dtdi comes after stdi, then 186 * XCOL_DEST_RECV_OP wins. 187 */ 188 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0], 189 XCOPY_NAA_IEEE_REGEX_LEN)) { 190 xop->op_origin = XCOL_DEST_RECV_OP; 191 xop->dst_dev = se_cmd->se_dev; 192 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination" 193 " received xop\n", xop->dst_dev); 194 } 195 } 196 197 return 0; 198 } 199 200 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd, 201 struct xcopy_op *xop, unsigned char *p, 202 unsigned short tdll, sense_reason_t *sense_ret) 203 { 204 struct se_device *local_dev = se_cmd->se_dev; 205 unsigned char *desc = p; 206 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc; 207 unsigned short cscd_index = 0; 208 unsigned short start = 0; 209 210 *sense_ret = TCM_INVALID_PARAMETER_LIST; 211 212 if (offset != 0) { 213 pr_err("XCOPY target descriptor list length is not" 214 " multiple of %d\n", XCOPY_TARGET_DESC_LEN); 215 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 216 return -EINVAL; 217 } 218 if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) { 219 pr_err("XCOPY target descriptor supports a maximum" 220 " two src/dest descriptors, tdll: %hu too large..\n", tdll); 221 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */ 222 *sense_ret = TCM_TOO_MANY_TARGET_DESCS; 223 return -EINVAL; 224 } 225 /* 226 * Generate an IEEE Registered Extended designator based upon the 227 * se_device the XCOPY was received upon.. 228 */ 229 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 230 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]); 231 232 while (start < tdll) { 233 /* 234 * Check target descriptor identification with 0xE4 type, and 235 * compare the current index with the CSCD descriptor IDs in 236 * the segment descriptor. Use VPD 0x83 WWPN matching .. 237 */ 238 switch (desc[0]) { 239 case 0xe4: 240 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop, 241 &desc[0], cscd_index); 242 if (rc != 0) 243 goto out; 244 start += XCOPY_TARGET_DESC_LEN; 245 desc += XCOPY_TARGET_DESC_LEN; 246 cscd_index++; 247 break; 248 default: 249 pr_err("XCOPY unsupported descriptor type code:" 250 " 0x%02x\n", desc[0]); 251 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; 252 goto out; 253 } 254 } 255 256 switch (xop->op_origin) { 257 case XCOL_SOURCE_RECV_OP: 258 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn, 259 &xop->dst_dev); 260 break; 261 case XCOL_DEST_RECV_OP: 262 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn, 263 &xop->src_dev); 264 break; 265 default: 266 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - " 267 "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi); 268 rc = -EINVAL; 269 break; 270 } 271 /* 272 * If a matching IEEE NAA 0x83 descriptor for the requested device 273 * is not located on this node, return COPY_ABORTED with ASQ/ASQC 274 * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the 275 * initiator to fall back to normal copy method. 276 */ 277 if (rc < 0) { 278 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE; 279 goto out; 280 } 281 282 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n", 283 xop->src_dev, &xop->src_tid_wwn[0]); 284 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n", 285 xop->dst_dev, &xop->dst_tid_wwn[0]); 286 287 return cscd_index; 288 289 out: 290 return -EINVAL; 291 } 292 293 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop, 294 unsigned char *p) 295 { 296 unsigned char *desc = p; 297 int dc = (desc[1] & 0x02); 298 unsigned short desc_len; 299 300 desc_len = get_unaligned_be16(&desc[2]); 301 if (desc_len != 0x18) { 302 pr_err("XCOPY segment desc 0x02: Illegal desc_len:" 303 " %hu\n", desc_len); 304 return -EINVAL; 305 } 306 307 xop->stdi = get_unaligned_be16(&desc[4]); 308 xop->dtdi = get_unaligned_be16(&desc[6]); 309 310 if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX || 311 xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) { 312 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n", 313 XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi); 314 return -EINVAL; 315 } 316 317 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n", 318 desc_len, xop->stdi, xop->dtdi, dc); 319 320 xop->nolb = get_unaligned_be16(&desc[10]); 321 xop->src_lba = get_unaligned_be64(&desc[12]); 322 xop->dst_lba = get_unaligned_be64(&desc[20]); 323 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n", 324 xop->nolb, (unsigned long long)xop->src_lba, 325 (unsigned long long)xop->dst_lba); 326 327 if (dc != 0) { 328 xop->dbl = get_unaligned_be24(&desc[29]); 329 330 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl); 331 } 332 return 0; 333 } 334 335 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd, 336 struct xcopy_op *xop, unsigned char *p, 337 unsigned int sdll, sense_reason_t *sense_ret) 338 { 339 unsigned char *desc = p; 340 unsigned int start = 0; 341 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; 342 343 *sense_ret = TCM_INVALID_PARAMETER_LIST; 344 345 if (offset != 0) { 346 pr_err("XCOPY segment descriptor list length is not" 347 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); 348 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 349 return -EINVAL; 350 } 351 if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) { 352 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too" 353 " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll); 354 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */ 355 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS; 356 return -EINVAL; 357 } 358 359 while (start < sdll) { 360 /* 361 * Check segment descriptor type code for block -> block 362 */ 363 switch (desc[0]) { 364 case 0x02: 365 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); 366 if (rc < 0) 367 goto out; 368 369 ret++; 370 start += XCOPY_SEGMENT_DESC_LEN; 371 desc += XCOPY_SEGMENT_DESC_LEN; 372 break; 373 default: 374 pr_err("XCOPY unsupported segment descriptor" 375 "type: 0x%02x\n", desc[0]); 376 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; 377 goto out; 378 } 379 } 380 381 return ret; 382 383 out: 384 return -EINVAL; 385 } 386 387 /* 388 * Start xcopy_pt ops 389 */ 390 391 struct xcopy_pt_cmd { 392 struct se_cmd se_cmd; 393 struct completion xpt_passthrough_sem; 394 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; 395 }; 396 397 struct se_portal_group xcopy_pt_tpg; 398 static struct se_session xcopy_pt_sess; 399 static struct se_node_acl xcopy_pt_nacl; 400 401 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) 402 { 403 return 0; 404 } 405 406 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) 407 { 408 struct se_device *remote_dev; 409 410 if (xop->op_origin == XCOL_SOURCE_RECV_OP) 411 remote_dev = xop->dst_dev; 412 else 413 remote_dev = xop->src_dev; 414 415 pr_debug("Calling configfs_undepend_item for" 416 " remote_dev: %p remote_dev->dev_group: %p\n", 417 remote_dev, &remote_dev->dev_group.cg_item); 418 419 target_undepend_item(&remote_dev->dev_group.cg_item); 420 } 421 422 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) 423 { 424 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 425 struct xcopy_pt_cmd, se_cmd); 426 427 kfree(xpt_cmd); 428 } 429 430 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd) 431 { 432 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 433 struct xcopy_pt_cmd, se_cmd); 434 435 complete(&xpt_cmd->xpt_passthrough_sem); 436 return 0; 437 } 438 439 static int xcopy_pt_write_pending(struct se_cmd *se_cmd) 440 { 441 return 0; 442 } 443 444 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) 445 { 446 return 0; 447 } 448 449 static int xcopy_pt_queue_status(struct se_cmd *se_cmd) 450 { 451 return 0; 452 } 453 454 static const struct target_core_fabric_ops xcopy_pt_tfo = { 455 .fabric_name = "xcopy-pt", 456 .get_cmd_state = xcopy_pt_get_cmd_state, 457 .release_cmd = xcopy_pt_release_cmd, 458 .check_stop_free = xcopy_pt_check_stop_free, 459 .write_pending = xcopy_pt_write_pending, 460 .queue_data_in = xcopy_pt_queue_data_in, 461 .queue_status = xcopy_pt_queue_status, 462 }; 463 464 /* 465 * End xcopy_pt_ops 466 */ 467 468 int target_xcopy_setup_pt(void) 469 { 470 int ret; 471 472 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0); 473 if (!xcopy_wq) { 474 pr_err("Unable to allocate xcopy_wq\n"); 475 return -ENOMEM; 476 } 477 478 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); 479 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node); 480 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); 481 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); 482 483 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; 484 485 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); 486 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); 487 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); 488 memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); 489 ret = transport_init_session(&xcopy_pt_sess); 490 if (ret < 0) 491 return ret; 492 493 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; 494 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; 495 496 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; 497 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; 498 499 return 0; 500 } 501 502 void target_xcopy_release_pt(void) 503 { 504 if (xcopy_wq) 505 destroy_workqueue(xcopy_wq); 506 } 507 508 /* 509 * target_xcopy_setup_pt_cmd - set up a pass-through command 510 * @xpt_cmd: Data structure to initialize. 511 * @xop: Describes the XCOPY operation received from an initiator. 512 * @se_dev: Backend device to associate with @xpt_cmd if 513 * @remote_port == true. 514 * @cdb: SCSI CDB to be copied into @xpt_cmd. 515 * @remote_port: If false, use the LUN through which the XCOPY command has 516 * been received. If true, use @se_dev->xcopy_lun. 517 * @alloc_mem: Whether or not to allocate an SGL list. 518 * 519 * Set up a SCSI command (READ or WRITE) that will be used to execute an 520 * XCOPY command. 521 */ 522 static int target_xcopy_setup_pt_cmd( 523 struct xcopy_pt_cmd *xpt_cmd, 524 struct xcopy_op *xop, 525 struct se_device *se_dev, 526 unsigned char *cdb, 527 bool remote_port, 528 bool alloc_mem) 529 { 530 struct se_cmd *cmd = &xpt_cmd->se_cmd; 531 sense_reason_t sense_rc; 532 int ret = 0, rc; 533 534 /* 535 * Setup LUN+port to honor reservations based upon xop->op_origin for 536 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. 537 */ 538 if (remote_port) { 539 cmd->se_lun = &se_dev->xcopy_lun; 540 cmd->se_dev = se_dev; 541 } else { 542 cmd->se_lun = xop->xop_se_cmd->se_lun; 543 cmd->se_dev = xop->xop_se_cmd->se_dev; 544 } 545 cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 546 547 cmd->tag = 0; 548 sense_rc = target_setup_cmd_from_cdb(cmd, cdb); 549 if (sense_rc) { 550 ret = -EINVAL; 551 goto out; 552 } 553 554 if (alloc_mem) { 555 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, 556 cmd->data_length, false, false); 557 if (rc < 0) { 558 ret = rc; 559 goto out; 560 } 561 /* 562 * Set this bit so that transport_free_pages() allows the 563 * caller to release SGLs + physical memory allocated by 564 * transport_generic_get_mem().. 565 */ 566 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 567 } else { 568 /* 569 * Here the previously allocated SGLs for the internal READ 570 * are mapped zero-copy to the internal WRITE. 571 */ 572 sense_rc = transport_generic_map_mem_to_cmd(cmd, 573 xop->xop_data_sg, xop->xop_data_nents, 574 NULL, 0); 575 if (sense_rc) { 576 ret = -EINVAL; 577 goto out; 578 } 579 580 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" 581 " %u\n", cmd->t_data_sg, cmd->t_data_nents); 582 } 583 584 return 0; 585 586 out: 587 return ret; 588 } 589 590 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) 591 { 592 struct se_cmd *se_cmd = &xpt_cmd->se_cmd; 593 sense_reason_t sense_rc; 594 595 sense_rc = transport_generic_new_cmd(se_cmd); 596 if (sense_rc) 597 return -EINVAL; 598 599 if (se_cmd->data_direction == DMA_TO_DEVICE) 600 target_execute_cmd(se_cmd); 601 602 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); 603 604 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", 605 se_cmd->scsi_status); 606 607 return (se_cmd->scsi_status) ? -EINVAL : 0; 608 } 609 610 static int target_xcopy_read_source( 611 struct se_cmd *ec_cmd, 612 struct xcopy_op *xop, 613 struct se_device *src_dev, 614 sector_t src_lba, 615 u32 src_sectors) 616 { 617 struct xcopy_pt_cmd *xpt_cmd; 618 struct se_cmd *se_cmd; 619 u32 length = (src_sectors * src_dev->dev_attrib.block_size); 620 int rc; 621 unsigned char cdb[16]; 622 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); 623 624 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 625 if (!xpt_cmd) { 626 pr_err("Unable to allocate xcopy_pt_cmd\n"); 627 return -ENOMEM; 628 } 629 init_completion(&xpt_cmd->xpt_passthrough_sem); 630 se_cmd = &xpt_cmd->se_cmd; 631 632 memset(&cdb[0], 0, 16); 633 cdb[0] = READ_16; 634 put_unaligned_be64(src_lba, &cdb[2]); 635 put_unaligned_be32(src_sectors, &cdb[10]); 636 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", 637 (unsigned long long)src_lba, src_sectors, length); 638 639 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 640 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 641 xop->src_pt_cmd = xpt_cmd; 642 643 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0], 644 remote_port, true); 645 if (rc < 0) { 646 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 647 transport_generic_free_cmd(se_cmd, 0); 648 return rc; 649 } 650 651 xop->xop_data_sg = se_cmd->t_data_sg; 652 xop->xop_data_nents = se_cmd->t_data_nents; 653 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" 654 " memory\n", xop->xop_data_sg, xop->xop_data_nents); 655 656 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 657 if (rc < 0) { 658 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 659 transport_generic_free_cmd(se_cmd, 0); 660 return rc; 661 } 662 /* 663 * Clear off the allocated t_data_sg, that has been saved for 664 * zero-copy WRITE submission reuse in struct xcopy_op.. 665 */ 666 se_cmd->t_data_sg = NULL; 667 se_cmd->t_data_nents = 0; 668 669 return 0; 670 } 671 672 static int target_xcopy_write_destination( 673 struct se_cmd *ec_cmd, 674 struct xcopy_op *xop, 675 struct se_device *dst_dev, 676 sector_t dst_lba, 677 u32 dst_sectors) 678 { 679 struct xcopy_pt_cmd *xpt_cmd; 680 struct se_cmd *se_cmd; 681 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); 682 int rc; 683 unsigned char cdb[16]; 684 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); 685 686 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 687 if (!xpt_cmd) { 688 pr_err("Unable to allocate xcopy_pt_cmd\n"); 689 return -ENOMEM; 690 } 691 init_completion(&xpt_cmd->xpt_passthrough_sem); 692 se_cmd = &xpt_cmd->se_cmd; 693 694 memset(&cdb[0], 0, 16); 695 cdb[0] = WRITE_16; 696 put_unaligned_be64(dst_lba, &cdb[2]); 697 put_unaligned_be32(dst_sectors, &cdb[10]); 698 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", 699 (unsigned long long)dst_lba, dst_sectors, length); 700 701 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 702 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 703 xop->dst_pt_cmd = xpt_cmd; 704 705 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0], 706 remote_port, false); 707 if (rc < 0) { 708 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd; 709 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 710 /* 711 * If the failure happened before the t_mem_list hand-off in 712 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that 713 * core releases this memory on error during X-COPY WRITE I/O. 714 */ 715 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 716 src_cmd->t_data_sg = xop->xop_data_sg; 717 src_cmd->t_data_nents = xop->xop_data_nents; 718 719 transport_generic_free_cmd(se_cmd, 0); 720 return rc; 721 } 722 723 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 724 if (rc < 0) { 725 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; 726 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 727 transport_generic_free_cmd(se_cmd, 0); 728 return rc; 729 } 730 731 return 0; 732 } 733 734 static void target_xcopy_do_work(struct work_struct *work) 735 { 736 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); 737 struct se_cmd *ec_cmd = xop->xop_se_cmd; 738 struct se_device *src_dev, *dst_dev; 739 sector_t src_lba, dst_lba, end_lba; 740 unsigned int max_sectors; 741 int rc = 0; 742 unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0; 743 744 if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE) 745 goto err_free; 746 747 if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) 748 goto err_free; 749 750 src_dev = xop->src_dev; 751 dst_dev = xop->dst_dev; 752 src_lba = xop->src_lba; 753 dst_lba = xop->dst_lba; 754 nolb = xop->nolb; 755 end_lba = src_lba + nolb; 756 /* 757 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the 758 * smallest max_sectors between src_dev + dev_dev, or 759 */ 760 max_sectors = min(src_dev->dev_attrib.hw_max_sectors, 761 dst_dev->dev_attrib.hw_max_sectors); 762 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); 763 764 max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); 765 766 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", 767 nolb, max_nolb, (unsigned long long)end_lba); 768 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", 769 (unsigned long long)src_lba, (unsigned long long)dst_lba); 770 771 while (src_lba < end_lba) { 772 cur_nolb = min(nolb, max_nolb); 773 774 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," 775 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); 776 777 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); 778 if (rc < 0) 779 goto out; 780 781 src_lba += cur_nolb; 782 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", 783 (unsigned long long)src_lba); 784 785 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," 786 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); 787 788 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, 789 dst_lba, cur_nolb); 790 if (rc < 0) { 791 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 792 goto out; 793 } 794 795 dst_lba += cur_nolb; 796 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", 797 (unsigned long long)dst_lba); 798 799 copied_nolb += cur_nolb; 800 nolb -= cur_nolb; 801 802 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 803 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 804 805 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0); 806 } 807 808 xcopy_pt_undepend_remotedev(xop); 809 kfree(xop); 810 811 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", 812 (unsigned long long)src_lba, (unsigned long long)dst_lba); 813 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", 814 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); 815 816 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); 817 target_complete_cmd(ec_cmd, SAM_STAT_GOOD); 818 return; 819 820 out: 821 xcopy_pt_undepend_remotedev(xop); 822 823 err_free: 824 kfree(xop); 825 /* 826 * Don't override an error scsi status if it has already been set 827 */ 828 if (ec_cmd->scsi_status == SAM_STAT_GOOD) { 829 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY" 830 " CHECK_CONDITION -> sending response\n", rc); 831 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 832 } 833 target_complete_cmd(ec_cmd, ec_cmd->scsi_status); 834 } 835 836 /* 837 * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing 838 * fails. 839 */ 840 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop) 841 { 842 struct se_cmd *se_cmd = xop->xop_se_cmd; 843 unsigned char *p = NULL, *seg_desc; 844 unsigned int list_id, list_id_usage, sdll, inline_dl; 845 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; 846 int rc; 847 unsigned short tdll; 848 849 p = transport_kmap_data_sg(se_cmd); 850 if (!p) { 851 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); 852 return TCM_OUT_OF_RESOURCES; 853 } 854 855 list_id = p[0]; 856 list_id_usage = (p[1] & 0x18) >> 3; 857 858 /* 859 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH 860 */ 861 tdll = get_unaligned_be16(&p[2]); 862 sdll = get_unaligned_be32(&p[8]); 863 if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) { 864 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n", 865 tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN); 866 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 867 goto out; 868 } 869 870 inline_dl = get_unaligned_be32(&p[12]); 871 if (inline_dl != 0) { 872 pr_err("XCOPY with non zero inline data length\n"); 873 goto out; 874 } 875 876 if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) { 877 pr_err("XCOPY parameter truncation: data length %u too small " 878 "for tdll: %hu sdll: %u inline_dl: %u\n", 879 se_cmd->data_length, tdll, sdll, inline_dl); 880 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 881 goto out; 882 } 883 884 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" 885 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, 886 tdll, sdll, inline_dl); 887 888 /* 889 * skip over the target descriptors until segment descriptors 890 * have been passed - CSCD ids are needed to determine src and dest. 891 */ 892 seg_desc = &p[16] + tdll; 893 894 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, 895 sdll, &ret); 896 if (rc <= 0) 897 goto out; 898 899 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, 900 rc * XCOPY_SEGMENT_DESC_LEN); 901 902 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret); 903 if (rc <= 0) 904 goto out; 905 906 if (xop->src_dev->dev_attrib.block_size != 907 xop->dst_dev->dev_attrib.block_size) { 908 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" 909 " block_size: %u currently unsupported\n", 910 xop->src_dev->dev_attrib.block_size, 911 xop->dst_dev->dev_attrib.block_size); 912 xcopy_pt_undepend_remotedev(xop); 913 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 914 goto out; 915 } 916 917 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, 918 rc * XCOPY_TARGET_DESC_LEN); 919 transport_kunmap_data_sg(se_cmd); 920 return TCM_NO_SENSE; 921 922 out: 923 if (p) 924 transport_kunmap_data_sg(se_cmd); 925 return ret; 926 } 927 928 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) 929 { 930 struct se_device *dev = se_cmd->se_dev; 931 struct xcopy_op *xop; 932 unsigned int sa; 933 934 if (!dev->dev_attrib.emulate_3pc) { 935 pr_err("EXTENDED_COPY operation explicitly disabled\n"); 936 return TCM_UNSUPPORTED_SCSI_OPCODE; 937 } 938 939 sa = se_cmd->t_task_cdb[1] & 0x1f; 940 if (sa != 0x00) { 941 pr_err("EXTENDED_COPY(LID4) not supported\n"); 942 return TCM_UNSUPPORTED_SCSI_OPCODE; 943 } 944 945 if (se_cmd->data_length == 0) { 946 target_complete_cmd(se_cmd, SAM_STAT_GOOD); 947 return TCM_NO_SENSE; 948 } 949 if (se_cmd->data_length < XCOPY_HDR_LEN) { 950 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n", 951 se_cmd->data_length, XCOPY_HDR_LEN); 952 return TCM_PARAMETER_LIST_LENGTH_ERROR; 953 } 954 955 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); 956 if (!xop) 957 goto err; 958 xop->xop_se_cmd = se_cmd; 959 INIT_WORK(&xop->xop_work, target_xcopy_do_work); 960 if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work))) 961 goto free; 962 return TCM_NO_SENSE; 963 964 free: 965 kfree(xop); 966 967 err: 968 return TCM_OUT_OF_RESOURCES; 969 } 970 971 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) 972 { 973 unsigned char *p; 974 975 p = transport_kmap_data_sg(se_cmd); 976 if (!p) { 977 pr_err("transport_kmap_data_sg failed in" 978 " target_rcr_operating_parameters\n"); 979 return TCM_OUT_OF_RESOURCES; 980 } 981 982 if (se_cmd->data_length < 54) { 983 pr_err("Receive Copy Results Op Parameters length" 984 " too small: %u\n", se_cmd->data_length); 985 transport_kunmap_data_sg(se_cmd); 986 return TCM_INVALID_CDB_FIELD; 987 } 988 /* 989 * Set SNLID=1 (Supports no List ID) 990 */ 991 p[4] = 0x1; 992 /* 993 * MAXIMUM TARGET DESCRIPTOR COUNT 994 */ 995 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); 996 /* 997 * MAXIMUM SEGMENT DESCRIPTOR COUNT 998 */ 999 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); 1000 /* 1001 * MAXIMUM DESCRIPTOR LIST LENGTH 1002 */ 1003 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); 1004 /* 1005 * MAXIMUM SEGMENT LENGTH 1006 */ 1007 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); 1008 /* 1009 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) 1010 */ 1011 put_unaligned_be32(0x0, &p[20]); 1012 /* 1013 * HELD DATA LIMIT 1014 */ 1015 put_unaligned_be32(0x0, &p[24]); 1016 /* 1017 * MAXIMUM STREAM DEVICE TRANSFER SIZE 1018 */ 1019 put_unaligned_be32(0x0, &p[28]); 1020 /* 1021 * TOTAL CONCURRENT COPIES 1022 */ 1023 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); 1024 /* 1025 * MAXIMUM CONCURRENT COPIES 1026 */ 1027 p[36] = RCR_OP_MAX_CONCURR_COPIES; 1028 /* 1029 * DATA SEGMENT GRANULARITY (log 2) 1030 */ 1031 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; 1032 /* 1033 * INLINE DATA GRANULARITY log 2) 1034 */ 1035 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; 1036 /* 1037 * HELD DATA GRANULARITY 1038 */ 1039 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; 1040 /* 1041 * IMPLEMENTED DESCRIPTOR LIST LENGTH 1042 */ 1043 p[43] = 0x2; 1044 /* 1045 * List of implemented descriptor type codes (ordered) 1046 */ 1047 p[44] = 0x02; /* Copy Block to Block device */ 1048 p[45] = 0xe4; /* Identification descriptor target descriptor */ 1049 1050 /* 1051 * AVAILABLE DATA (n-3) 1052 */ 1053 put_unaligned_be32(42, &p[0]); 1054 1055 transport_kunmap_data_sg(se_cmd); 1056 target_complete_cmd(se_cmd, GOOD); 1057 1058 return TCM_NO_SENSE; 1059 } 1060 1061 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) 1062 { 1063 unsigned char *cdb = &se_cmd->t_task_cdb[0]; 1064 int sa = (cdb[1] & 0x1f), list_id = cdb[2]; 1065 sense_reason_t rc = TCM_NO_SENSE; 1066 1067 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" 1068 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); 1069 1070 if (list_id != 0) { 1071 pr_err("Receive Copy Results with non zero list identifier" 1072 " not supported\n"); 1073 return TCM_INVALID_CDB_FIELD; 1074 } 1075 1076 switch (sa) { 1077 case RCR_SA_OPERATING_PARAMETERS: 1078 rc = target_rcr_operating_parameters(se_cmd); 1079 break; 1080 case RCR_SA_COPY_STATUS: 1081 case RCR_SA_RECEIVE_DATA: 1082 case RCR_SA_FAILED_SEGMENT_DETAILS: 1083 default: 1084 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); 1085 return TCM_INVALID_CDB_FIELD; 1086 } 1087 1088 return rc; 1089 } 1090