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