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