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