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