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.h> 29 #include <scsi/scsi_cmnd.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 #include <target/target_core_configfs.h> 36 37 #include "target_core_internal.h" 38 #include "target_core_pr.h" 39 #include "target_core_ua.h" 40 #include "target_core_xcopy.h" 41 42 static struct workqueue_struct *xcopy_wq = NULL; 43 44 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf) 45 { 46 int off = 0; 47 48 buf[off++] = (0x6 << 4); 49 buf[off++] = 0x01; 50 buf[off++] = 0x40; 51 buf[off] = (0x5 << 4); 52 53 spc_parse_naa_6h_vendor_specific(dev, &buf[off]); 54 return 0; 55 } 56 57 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, 58 bool src) 59 { 60 struct se_device *se_dev; 61 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn; 62 int rc; 63 64 if (src) 65 dev_wwn = &xop->dst_tid_wwn[0]; 66 else 67 dev_wwn = &xop->src_tid_wwn[0]; 68 69 mutex_lock(&g_device_mutex); 70 list_for_each_entry(se_dev, &g_device_list, g_dev_node) { 71 72 if (!se_dev->dev_attrib.emulate_3pc) 73 continue; 74 75 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); 76 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]); 77 78 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); 79 if (rc != 0) 80 continue; 81 82 if (src) { 83 xop->dst_dev = se_dev; 84 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located" 85 " se_dev\n", xop->dst_dev); 86 } else { 87 xop->src_dev = se_dev; 88 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located" 89 " se_dev\n", xop->src_dev); 90 } 91 92 rc = target_depend_item(&se_dev->dev_group.cg_item); 93 if (rc != 0) { 94 pr_err("configfs_depend_item attempt failed:" 95 " %d for se_dev: %p\n", rc, se_dev); 96 mutex_unlock(&g_device_mutex); 97 return rc; 98 } 99 100 pr_debug("Called configfs_depend_item for se_dev: %p" 101 " se_dev->se_dev_group: %p\n", se_dev, 102 &se_dev->dev_group); 103 104 mutex_unlock(&g_device_mutex); 105 return 0; 106 } 107 mutex_unlock(&g_device_mutex); 108 109 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n"); 110 return -EINVAL; 111 } 112 113 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, 114 unsigned char *p, bool src) 115 { 116 unsigned char *desc = p; 117 unsigned short ript; 118 u8 desig_len; 119 /* 120 * Extract RELATIVE INITIATOR PORT IDENTIFIER 121 */ 122 ript = get_unaligned_be16(&desc[2]); 123 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript); 124 /* 125 * Check for supported code set, association, and designator type 126 */ 127 if ((desc[4] & 0x0f) != 0x1) { 128 pr_err("XCOPY 0xe4: code set of non binary type not supported\n"); 129 return -EINVAL; 130 } 131 if ((desc[5] & 0x30) != 0x00) { 132 pr_err("XCOPY 0xe4: association other than LUN not supported\n"); 133 return -EINVAL; 134 } 135 if ((desc[5] & 0x0f) != 0x3) { 136 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n", 137 (desc[5] & 0x0f)); 138 return -EINVAL; 139 } 140 /* 141 * Check for matching 16 byte length for NAA IEEE Registered Extended 142 * Assigned designator 143 */ 144 desig_len = desc[7]; 145 if (desig_len != 16) { 146 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len); 147 return -EINVAL; 148 } 149 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len); 150 /* 151 * Check for NAA IEEE Registered Extended Assigned header.. 152 */ 153 if ((desc[8] & 0xf0) != 0x60) { 154 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n", 155 (desc[8] & 0xf0)); 156 return -EINVAL; 157 } 158 159 if (src) { 160 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 161 /* 162 * Determine if the source designator matches the local device 163 */ 164 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0], 165 XCOPY_NAA_IEEE_REGEX_LEN)) { 166 xop->op_origin = XCOL_SOURCE_RECV_OP; 167 xop->src_dev = se_cmd->se_dev; 168 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source" 169 " received xop\n", xop->src_dev); 170 } 171 } else { 172 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); 173 /* 174 * Determine if the destination designator matches the local device 175 */ 176 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0], 177 XCOPY_NAA_IEEE_REGEX_LEN)) { 178 xop->op_origin = XCOL_DEST_RECV_OP; 179 xop->dst_dev = se_cmd->se_dev; 180 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination" 181 " received xop\n", xop->dst_dev); 182 } 183 } 184 185 return 0; 186 } 187 188 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd, 189 struct xcopy_op *xop, unsigned char *p, 190 unsigned short tdll) 191 { 192 struct se_device *local_dev = se_cmd->se_dev; 193 unsigned char *desc = p; 194 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0; 195 unsigned short start = 0; 196 bool src = true; 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 (rc < 0) 250 goto out; 251 252 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n", 253 xop->src_dev, &xop->src_tid_wwn[0]); 254 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n", 255 xop->dst_dev, &xop->dst_tid_wwn[0]); 256 257 return ret; 258 259 out: 260 return -EINVAL; 261 } 262 263 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop, 264 unsigned char *p) 265 { 266 unsigned char *desc = p; 267 int dc = (desc[1] & 0x02); 268 unsigned short desc_len; 269 270 desc_len = get_unaligned_be16(&desc[2]); 271 if (desc_len != 0x18) { 272 pr_err("XCOPY segment desc 0x02: Illegal desc_len:" 273 " %hu\n", desc_len); 274 return -EINVAL; 275 } 276 277 xop->stdi = get_unaligned_be16(&desc[4]); 278 xop->dtdi = get_unaligned_be16(&desc[6]); 279 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n", 280 desc_len, xop->stdi, xop->dtdi, dc); 281 282 xop->nolb = get_unaligned_be16(&desc[10]); 283 xop->src_lba = get_unaligned_be64(&desc[12]); 284 xop->dst_lba = get_unaligned_be64(&desc[20]); 285 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n", 286 xop->nolb, (unsigned long long)xop->src_lba, 287 (unsigned long long)xop->dst_lba); 288 289 if (dc != 0) { 290 xop->dbl = (desc[29] & 0xff) << 16; 291 xop->dbl |= (desc[30] & 0xff) << 8; 292 xop->dbl |= desc[31] & 0xff; 293 294 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl); 295 } 296 return 0; 297 } 298 299 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd, 300 struct xcopy_op *xop, unsigned char *p, 301 unsigned int sdll) 302 { 303 unsigned char *desc = p; 304 unsigned int start = 0; 305 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; 306 307 if (offset != 0) { 308 pr_err("XCOPY segment descriptor list length is not" 309 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); 310 return -EINVAL; 311 } 312 313 while (start < sdll) { 314 /* 315 * Check segment descriptor type code for block -> block 316 */ 317 switch (desc[0]) { 318 case 0x02: 319 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); 320 if (rc < 0) 321 goto out; 322 323 ret++; 324 start += XCOPY_SEGMENT_DESC_LEN; 325 desc += XCOPY_SEGMENT_DESC_LEN; 326 break; 327 default: 328 pr_err("XCOPY unsupported segment descriptor" 329 "type: 0x%02x\n", desc[0]); 330 goto out; 331 } 332 } 333 334 return ret; 335 336 out: 337 return -EINVAL; 338 } 339 340 /* 341 * Start xcopy_pt ops 342 */ 343 344 struct xcopy_pt_cmd { 345 bool remote_port; 346 struct se_cmd se_cmd; 347 struct xcopy_op *xcopy_op; 348 struct completion xpt_passthrough_sem; 349 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; 350 }; 351 352 static struct se_port xcopy_pt_port; 353 static struct se_portal_group xcopy_pt_tpg; 354 static struct se_session xcopy_pt_sess; 355 static struct se_node_acl xcopy_pt_nacl; 356 357 static char *xcopy_pt_get_fabric_name(void) 358 { 359 return "xcopy-pt"; 360 } 361 362 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd) 363 { 364 return 0; 365 } 366 367 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) 368 { 369 return 0; 370 } 371 372 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) 373 { 374 struct se_device *remote_dev; 375 376 if (xop->op_origin == XCOL_SOURCE_RECV_OP) 377 remote_dev = xop->dst_dev; 378 else 379 remote_dev = xop->src_dev; 380 381 pr_debug("Calling configfs_undepend_item for" 382 " remote_dev: %p remote_dev->dev_group: %p\n", 383 remote_dev, &remote_dev->dev_group.cg_item); 384 385 target_undepend_item(&remote_dev->dev_group.cg_item); 386 } 387 388 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) 389 { 390 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 391 struct xcopy_pt_cmd, se_cmd); 392 393 kfree(xpt_cmd); 394 } 395 396 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd) 397 { 398 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, 399 struct xcopy_pt_cmd, se_cmd); 400 401 complete(&xpt_cmd->xpt_passthrough_sem); 402 return 0; 403 } 404 405 static int xcopy_pt_write_pending(struct se_cmd *se_cmd) 406 { 407 return 0; 408 } 409 410 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd) 411 { 412 return 0; 413 } 414 415 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) 416 { 417 return 0; 418 } 419 420 static int xcopy_pt_queue_status(struct se_cmd *se_cmd) 421 { 422 return 0; 423 } 424 425 static const struct target_core_fabric_ops xcopy_pt_tfo = { 426 .get_fabric_name = xcopy_pt_get_fabric_name, 427 .get_task_tag = xcopy_pt_get_tag, 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_port, 0, sizeof(struct se_port)); 450 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list); 451 INIT_LIST_HEAD(&xcopy_pt_port.sep_list); 452 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex); 453 454 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); 455 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node); 456 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); 457 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); 458 459 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg; 460 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; 461 462 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); 463 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); 464 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); 465 memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); 466 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list); 467 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list); 468 469 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; 470 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; 471 472 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; 473 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; 474 475 return 0; 476 } 477 478 void target_xcopy_release_pt(void) 479 { 480 if (xcopy_wq) 481 destroy_workqueue(xcopy_wq); 482 } 483 484 static void target_xcopy_setup_pt_port( 485 struct xcopy_pt_cmd *xpt_cmd, 486 struct xcopy_op *xop, 487 bool remote_port) 488 { 489 struct se_cmd *ec_cmd = xop->xop_se_cmd; 490 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd; 491 492 if (xop->op_origin == XCOL_SOURCE_RECV_OP) { 493 /* 494 * Honor destination port reservations for X-COPY PUSH emulation 495 * when CDB is received on local source port, and READs blocks to 496 * WRITE on remote destination port. 497 */ 498 if (remote_port) { 499 xpt_cmd->remote_port = remote_port; 500 pt_cmd->se_lun->lun_sep = &xcopy_pt_port; 501 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to" 502 " cmd->se_lun->lun_sep for X-COPY data PUSH\n", 503 pt_cmd->se_lun->lun_sep); 504 } else { 505 pt_cmd->se_lun = ec_cmd->se_lun; 506 pt_cmd->se_dev = ec_cmd->se_dev; 507 508 pr_debug("Honoring local SRC port from ec_cmd->se_dev:" 509 " %p\n", pt_cmd->se_dev); 510 pt_cmd->se_lun = ec_cmd->se_lun; 511 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n", 512 pt_cmd->se_lun); 513 } 514 } else { 515 /* 516 * Honor source port reservation for X-COPY PULL emulation 517 * when CDB is received on local desintation port, and READs 518 * blocks from the remote source port to WRITE on local 519 * destination port. 520 */ 521 if (remote_port) { 522 xpt_cmd->remote_port = remote_port; 523 pt_cmd->se_lun->lun_sep = &xcopy_pt_port; 524 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to" 525 " cmd->se_lun->lun_sep for X-COPY data PULL\n", 526 pt_cmd->se_lun->lun_sep); 527 } else { 528 pt_cmd->se_lun = ec_cmd->se_lun; 529 pt_cmd->se_dev = ec_cmd->se_dev; 530 531 pr_debug("Honoring local DST port from ec_cmd->se_dev:" 532 " %p\n", pt_cmd->se_dev); 533 pt_cmd->se_lun = ec_cmd->se_lun; 534 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n", 535 pt_cmd->se_lun); 536 } 537 } 538 } 539 540 static void target_xcopy_init_pt_lun(struct se_device *se_dev, 541 struct se_cmd *pt_cmd, bool remote_port) 542 { 543 /* 544 * Don't allocate + init an pt_cmd->se_lun if honoring local port for 545 * reservations. The pt_cmd->se_lun pointer will be setup from within 546 * target_xcopy_setup_pt_port() 547 */ 548 if (remote_port) { 549 pr_debug("Setup emulated se_dev: %p from se_dev\n", 550 pt_cmd->se_dev); 551 pt_cmd->se_lun = &se_dev->xcopy_lun; 552 pt_cmd->se_dev = se_dev; 553 } 554 555 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 556 } 557 558 static int target_xcopy_setup_pt_cmd( 559 struct xcopy_pt_cmd *xpt_cmd, 560 struct xcopy_op *xop, 561 struct se_device *se_dev, 562 unsigned char *cdb, 563 bool remote_port, 564 bool alloc_mem) 565 { 566 struct se_cmd *cmd = &xpt_cmd->se_cmd; 567 sense_reason_t sense_rc; 568 int ret = 0, rc; 569 /* 570 * Setup LUN+port to honor reservations based upon xop->op_origin for 571 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. 572 */ 573 target_xcopy_init_pt_lun(se_dev, cmd, remote_port); 574 575 xpt_cmd->xcopy_op = xop; 576 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port); 577 578 sense_rc = target_setup_cmd_from_cdb(cmd, cdb); 579 if (sense_rc) { 580 ret = -EINVAL; 581 goto out; 582 } 583 584 if (alloc_mem) { 585 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, 586 cmd->data_length, false); 587 if (rc < 0) { 588 ret = rc; 589 goto out; 590 } 591 /* 592 * Set this bit so that transport_free_pages() allows the 593 * caller to release SGLs + physical memory allocated by 594 * transport_generic_get_mem().. 595 */ 596 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 597 } else { 598 /* 599 * Here the previously allocated SGLs for the internal READ 600 * are mapped zero-copy to the internal WRITE. 601 */ 602 sense_rc = transport_generic_map_mem_to_cmd(cmd, 603 xop->xop_data_sg, xop->xop_data_nents, 604 NULL, 0); 605 if (sense_rc) { 606 ret = -EINVAL; 607 goto out; 608 } 609 610 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" 611 " %u\n", cmd->t_data_sg, cmd->t_data_nents); 612 } 613 614 return 0; 615 616 out: 617 return ret; 618 } 619 620 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) 621 { 622 struct se_cmd *se_cmd = &xpt_cmd->se_cmd; 623 sense_reason_t sense_rc; 624 625 sense_rc = transport_generic_new_cmd(se_cmd); 626 if (sense_rc) 627 return -EINVAL; 628 629 if (se_cmd->data_direction == DMA_TO_DEVICE) 630 target_execute_cmd(se_cmd); 631 632 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); 633 634 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", 635 se_cmd->scsi_status); 636 637 return (se_cmd->scsi_status) ? -EINVAL : 0; 638 } 639 640 static int target_xcopy_read_source( 641 struct se_cmd *ec_cmd, 642 struct xcopy_op *xop, 643 struct se_device *src_dev, 644 sector_t src_lba, 645 u32 src_sectors) 646 { 647 struct xcopy_pt_cmd *xpt_cmd; 648 struct se_cmd *se_cmd; 649 u32 length = (src_sectors * src_dev->dev_attrib.block_size); 650 int rc; 651 unsigned char cdb[16]; 652 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); 653 654 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 655 if (!xpt_cmd) { 656 pr_err("Unable to allocate xcopy_pt_cmd\n"); 657 return -ENOMEM; 658 } 659 init_completion(&xpt_cmd->xpt_passthrough_sem); 660 se_cmd = &xpt_cmd->se_cmd; 661 662 memset(&cdb[0], 0, 16); 663 cdb[0] = READ_16; 664 put_unaligned_be64(src_lba, &cdb[2]); 665 put_unaligned_be32(src_sectors, &cdb[10]); 666 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", 667 (unsigned long long)src_lba, src_sectors, length); 668 669 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length, 670 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 671 xop->src_pt_cmd = xpt_cmd; 672 673 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0], 674 remote_port, true); 675 if (rc < 0) { 676 transport_generic_free_cmd(se_cmd, 0); 677 return rc; 678 } 679 680 xop->xop_data_sg = se_cmd->t_data_sg; 681 xop->xop_data_nents = se_cmd->t_data_nents; 682 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" 683 " memory\n", xop->xop_data_sg, xop->xop_data_nents); 684 685 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 686 if (rc < 0) { 687 transport_generic_free_cmd(se_cmd, 0); 688 return rc; 689 } 690 /* 691 * Clear off the allocated t_data_sg, that has been saved for 692 * zero-copy WRITE submission reuse in struct xcopy_op.. 693 */ 694 se_cmd->t_data_sg = NULL; 695 se_cmd->t_data_nents = 0; 696 697 return 0; 698 } 699 700 static int target_xcopy_write_destination( 701 struct se_cmd *ec_cmd, 702 struct xcopy_op *xop, 703 struct se_device *dst_dev, 704 sector_t dst_lba, 705 u32 dst_sectors) 706 { 707 struct xcopy_pt_cmd *xpt_cmd; 708 struct se_cmd *se_cmd; 709 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); 710 int rc; 711 unsigned char cdb[16]; 712 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); 713 714 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 715 if (!xpt_cmd) { 716 pr_err("Unable to allocate xcopy_pt_cmd\n"); 717 return -ENOMEM; 718 } 719 init_completion(&xpt_cmd->xpt_passthrough_sem); 720 se_cmd = &xpt_cmd->se_cmd; 721 722 memset(&cdb[0], 0, 16); 723 cdb[0] = WRITE_16; 724 put_unaligned_be64(dst_lba, &cdb[2]); 725 put_unaligned_be32(dst_sectors, &cdb[10]); 726 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", 727 (unsigned long long)dst_lba, dst_sectors, length); 728 729 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length, 730 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 731 xop->dst_pt_cmd = xpt_cmd; 732 733 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0], 734 remote_port, false); 735 if (rc < 0) { 736 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd; 737 /* 738 * If the failure happened before the t_mem_list hand-off in 739 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that 740 * core releases this memory on error during X-COPY WRITE I/O. 741 */ 742 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 743 src_cmd->t_data_sg = xop->xop_data_sg; 744 src_cmd->t_data_nents = xop->xop_data_nents; 745 746 transport_generic_free_cmd(se_cmd, 0); 747 return rc; 748 } 749 750 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 751 if (rc < 0) { 752 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 753 transport_generic_free_cmd(se_cmd, 0); 754 return rc; 755 } 756 757 return 0; 758 } 759 760 static void target_xcopy_do_work(struct work_struct *work) 761 { 762 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); 763 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev; 764 struct se_cmd *ec_cmd = xop->xop_se_cmd; 765 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba; 766 unsigned int max_sectors; 767 int rc; 768 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0; 769 770 end_lba = src_lba + nolb; 771 /* 772 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the 773 * smallest max_sectors between src_dev + dev_dev, or 774 */ 775 max_sectors = min(src_dev->dev_attrib.hw_max_sectors, 776 dst_dev->dev_attrib.hw_max_sectors); 777 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); 778 779 max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); 780 781 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", 782 nolb, max_nolb, (unsigned long long)end_lba); 783 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", 784 (unsigned long long)src_lba, (unsigned long long)dst_lba); 785 786 while (src_lba < end_lba) { 787 cur_nolb = min(nolb, max_nolb); 788 789 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," 790 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); 791 792 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); 793 if (rc < 0) 794 goto out; 795 796 src_lba += cur_nolb; 797 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", 798 (unsigned long long)src_lba); 799 800 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," 801 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); 802 803 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, 804 dst_lba, cur_nolb); 805 if (rc < 0) { 806 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 807 goto out; 808 } 809 810 dst_lba += cur_nolb; 811 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", 812 (unsigned long long)dst_lba); 813 814 copied_nolb += cur_nolb; 815 nolb -= cur_nolb; 816 817 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 818 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 819 820 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0); 821 } 822 823 xcopy_pt_undepend_remotedev(xop); 824 kfree(xop); 825 826 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", 827 (unsigned long long)src_lba, (unsigned long long)dst_lba); 828 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", 829 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); 830 831 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); 832 target_complete_cmd(ec_cmd, SAM_STAT_GOOD); 833 return; 834 835 out: 836 xcopy_pt_undepend_remotedev(xop); 837 kfree(xop); 838 839 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n"); 840 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 841 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION); 842 } 843 844 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) 845 { 846 struct se_device *dev = se_cmd->se_dev; 847 struct xcopy_op *xop = NULL; 848 unsigned char *p = NULL, *seg_desc; 849 unsigned int list_id, list_id_usage, sdll, inline_dl, sa; 850 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; 851 int rc; 852 unsigned short tdll; 853 854 if (!dev->dev_attrib.emulate_3pc) { 855 pr_err("EXTENDED_COPY operation explicitly disabled\n"); 856 return TCM_UNSUPPORTED_SCSI_OPCODE; 857 } 858 859 sa = se_cmd->t_task_cdb[1] & 0x1f; 860 if (sa != 0x00) { 861 pr_err("EXTENDED_COPY(LID4) not supported\n"); 862 return TCM_UNSUPPORTED_SCSI_OPCODE; 863 } 864 865 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); 866 if (!xop) { 867 pr_err("Unable to allocate xcopy_op\n"); 868 return TCM_OUT_OF_RESOURCES; 869 } 870 xop->xop_se_cmd = se_cmd; 871 872 p = transport_kmap_data_sg(se_cmd); 873 if (!p) { 874 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); 875 kfree(xop); 876 return TCM_OUT_OF_RESOURCES; 877 } 878 879 list_id = p[0]; 880 list_id_usage = (p[1] & 0x18) >> 3; 881 882 /* 883 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH 884 */ 885 tdll = get_unaligned_be16(&p[2]); 886 sdll = get_unaligned_be32(&p[8]); 887 888 inline_dl = get_unaligned_be32(&p[12]); 889 if (inline_dl != 0) { 890 pr_err("XCOPY with non zero inline data length\n"); 891 goto out; 892 } 893 894 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" 895 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, 896 tdll, sdll, inline_dl); 897 898 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll); 899 if (rc <= 0) 900 goto out; 901 902 if (xop->src_dev->dev_attrib.block_size != 903 xop->dst_dev->dev_attrib.block_size) { 904 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" 905 " block_size: %u currently unsupported\n", 906 xop->src_dev->dev_attrib.block_size, 907 xop->dst_dev->dev_attrib.block_size); 908 xcopy_pt_undepend_remotedev(xop); 909 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 910 goto out; 911 } 912 913 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, 914 rc * XCOPY_TARGET_DESC_LEN); 915 seg_desc = &p[16]; 916 seg_desc += (rc * XCOPY_TARGET_DESC_LEN); 917 918 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll); 919 if (rc <= 0) { 920 xcopy_pt_undepend_remotedev(xop); 921 goto out; 922 } 923 transport_kunmap_data_sg(se_cmd); 924 925 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, 926 rc * XCOPY_SEGMENT_DESC_LEN); 927 INIT_WORK(&xop->xop_work, target_xcopy_do_work); 928 queue_work(xcopy_wq, &xop->xop_work); 929 return TCM_NO_SENSE; 930 931 out: 932 if (p) 933 transport_kunmap_data_sg(se_cmd); 934 kfree(xop); 935 return ret; 936 } 937 938 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) 939 { 940 unsigned char *p; 941 942 p = transport_kmap_data_sg(se_cmd); 943 if (!p) { 944 pr_err("transport_kmap_data_sg failed in" 945 " target_rcr_operating_parameters\n"); 946 return TCM_OUT_OF_RESOURCES; 947 } 948 949 if (se_cmd->data_length < 54) { 950 pr_err("Receive Copy Results Op Parameters length" 951 " too small: %u\n", se_cmd->data_length); 952 transport_kunmap_data_sg(se_cmd); 953 return TCM_INVALID_CDB_FIELD; 954 } 955 /* 956 * Set SNLID=1 (Supports no List ID) 957 */ 958 p[4] = 0x1; 959 /* 960 * MAXIMUM TARGET DESCRIPTOR COUNT 961 */ 962 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); 963 /* 964 * MAXIMUM SEGMENT DESCRIPTOR COUNT 965 */ 966 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); 967 /* 968 * MAXIMUM DESCRIPTOR LIST LENGTH 969 */ 970 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); 971 /* 972 * MAXIMUM SEGMENT LENGTH 973 */ 974 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); 975 /* 976 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) 977 */ 978 put_unaligned_be32(0x0, &p[20]); 979 /* 980 * HELD DATA LIMIT 981 */ 982 put_unaligned_be32(0x0, &p[24]); 983 /* 984 * MAXIMUM STREAM DEVICE TRANSFER SIZE 985 */ 986 put_unaligned_be32(0x0, &p[28]); 987 /* 988 * TOTAL CONCURRENT COPIES 989 */ 990 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); 991 /* 992 * MAXIMUM CONCURRENT COPIES 993 */ 994 p[36] = RCR_OP_MAX_CONCURR_COPIES; 995 /* 996 * DATA SEGMENT GRANULARITY (log 2) 997 */ 998 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; 999 /* 1000 * INLINE DATA GRANULARITY log 2) 1001 */ 1002 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; 1003 /* 1004 * HELD DATA GRANULARITY 1005 */ 1006 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; 1007 /* 1008 * IMPLEMENTED DESCRIPTOR LIST LENGTH 1009 */ 1010 p[43] = 0x2; 1011 /* 1012 * List of implemented descriptor type codes (ordered) 1013 */ 1014 p[44] = 0x02; /* Copy Block to Block device */ 1015 p[45] = 0xe4; /* Identification descriptor target descriptor */ 1016 1017 /* 1018 * AVAILABLE DATA (n-3) 1019 */ 1020 put_unaligned_be32(42, &p[0]); 1021 1022 transport_kunmap_data_sg(se_cmd); 1023 target_complete_cmd(se_cmd, GOOD); 1024 1025 return TCM_NO_SENSE; 1026 } 1027 1028 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) 1029 { 1030 unsigned char *cdb = &se_cmd->t_task_cdb[0]; 1031 int sa = (cdb[1] & 0x1f), list_id = cdb[2]; 1032 sense_reason_t rc = TCM_NO_SENSE; 1033 1034 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" 1035 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); 1036 1037 if (list_id != 0) { 1038 pr_err("Receive Copy Results with non zero list identifier" 1039 " not supported\n"); 1040 return TCM_INVALID_CDB_FIELD; 1041 } 1042 1043 switch (sa) { 1044 case RCR_SA_OPERATING_PARAMETERS: 1045 rc = target_rcr_operating_parameters(se_cmd); 1046 break; 1047 case RCR_SA_COPY_STATUS: 1048 case RCR_SA_RECEIVE_DATA: 1049 case RCR_SA_FAILED_SEGMENT_DETAILS: 1050 default: 1051 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); 1052 return TCM_INVALID_CDB_FIELD; 1053 } 1054 1055 return rc; 1056 } 1057