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 INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list); 454 spin_lock_init(&xcopy_pt_sess.sess_cmd_lock); 455 456 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; 457 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; 458 459 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; 460 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; 461 462 return 0; 463 } 464 465 void target_xcopy_release_pt(void) 466 { 467 if (xcopy_wq) 468 destroy_workqueue(xcopy_wq); 469 } 470 471 static void target_xcopy_setup_pt_port( 472 struct xcopy_pt_cmd *xpt_cmd, 473 struct xcopy_op *xop, 474 bool remote_port) 475 { 476 struct se_cmd *ec_cmd = xop->xop_se_cmd; 477 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd; 478 479 if (xop->op_origin == XCOL_SOURCE_RECV_OP) { 480 /* 481 * Honor destination port reservations for X-COPY PUSH emulation 482 * when CDB is received on local source port, and READs blocks to 483 * WRITE on remote destination port. 484 */ 485 if (remote_port) { 486 xpt_cmd->remote_port = remote_port; 487 } else { 488 pt_cmd->se_lun = ec_cmd->se_lun; 489 pt_cmd->se_dev = ec_cmd->se_dev; 490 491 pr_debug("Honoring local SRC port from ec_cmd->se_dev:" 492 " %p\n", pt_cmd->se_dev); 493 pt_cmd->se_lun = ec_cmd->se_lun; 494 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n", 495 pt_cmd->se_lun); 496 } 497 } else { 498 /* 499 * Honor source port reservation for X-COPY PULL emulation 500 * when CDB is received on local desintation port, and READs 501 * blocks from the remote source port to WRITE on local 502 * destination port. 503 */ 504 if (remote_port) { 505 xpt_cmd->remote_port = remote_port; 506 } else { 507 pt_cmd->se_lun = ec_cmd->se_lun; 508 pt_cmd->se_dev = ec_cmd->se_dev; 509 510 pr_debug("Honoring local DST port from ec_cmd->se_dev:" 511 " %p\n", pt_cmd->se_dev); 512 pt_cmd->se_lun = ec_cmd->se_lun; 513 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n", 514 pt_cmd->se_lun); 515 } 516 } 517 } 518 519 static void target_xcopy_init_pt_lun(struct se_device *se_dev, 520 struct se_cmd *pt_cmd, bool remote_port) 521 { 522 /* 523 * Don't allocate + init an pt_cmd->se_lun if honoring local port for 524 * reservations. The pt_cmd->se_lun pointer will be setup from within 525 * target_xcopy_setup_pt_port() 526 */ 527 if (remote_port) { 528 pr_debug("Setup emulated se_dev: %p from se_dev\n", 529 pt_cmd->se_dev); 530 pt_cmd->se_lun = &se_dev->xcopy_lun; 531 pt_cmd->se_dev = se_dev; 532 } 533 534 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; 535 } 536 537 static int target_xcopy_setup_pt_cmd( 538 struct xcopy_pt_cmd *xpt_cmd, 539 struct xcopy_op *xop, 540 struct se_device *se_dev, 541 unsigned char *cdb, 542 bool remote_port, 543 bool alloc_mem) 544 { 545 struct se_cmd *cmd = &xpt_cmd->se_cmd; 546 sense_reason_t sense_rc; 547 int ret = 0, rc; 548 /* 549 * Setup LUN+port to honor reservations based upon xop->op_origin for 550 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. 551 */ 552 target_xcopy_init_pt_lun(se_dev, cmd, remote_port); 553 554 xpt_cmd->xcopy_op = xop; 555 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port); 556 557 cmd->tag = 0; 558 sense_rc = target_setup_cmd_from_cdb(cmd, cdb); 559 if (sense_rc) { 560 ret = -EINVAL; 561 goto out; 562 } 563 564 if (alloc_mem) { 565 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, 566 cmd->data_length, false); 567 if (rc < 0) { 568 ret = rc; 569 goto out; 570 } 571 /* 572 * Set this bit so that transport_free_pages() allows the 573 * caller to release SGLs + physical memory allocated by 574 * transport_generic_get_mem().. 575 */ 576 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 577 } else { 578 /* 579 * Here the previously allocated SGLs for the internal READ 580 * are mapped zero-copy to the internal WRITE. 581 */ 582 sense_rc = transport_generic_map_mem_to_cmd(cmd, 583 xop->xop_data_sg, xop->xop_data_nents, 584 NULL, 0); 585 if (sense_rc) { 586 ret = -EINVAL; 587 goto out; 588 } 589 590 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" 591 " %u\n", cmd->t_data_sg, cmd->t_data_nents); 592 } 593 594 return 0; 595 596 out: 597 return ret; 598 } 599 600 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) 601 { 602 struct se_cmd *se_cmd = &xpt_cmd->se_cmd; 603 sense_reason_t sense_rc; 604 605 sense_rc = transport_generic_new_cmd(se_cmd); 606 if (sense_rc) 607 return -EINVAL; 608 609 if (se_cmd->data_direction == DMA_TO_DEVICE) 610 target_execute_cmd(se_cmd); 611 612 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); 613 614 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", 615 se_cmd->scsi_status); 616 617 return (se_cmd->scsi_status) ? -EINVAL : 0; 618 } 619 620 static int target_xcopy_read_source( 621 struct se_cmd *ec_cmd, 622 struct xcopy_op *xop, 623 struct se_device *src_dev, 624 sector_t src_lba, 625 u32 src_sectors) 626 { 627 struct xcopy_pt_cmd *xpt_cmd; 628 struct se_cmd *se_cmd; 629 u32 length = (src_sectors * src_dev->dev_attrib.block_size); 630 int rc; 631 unsigned char cdb[16]; 632 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); 633 634 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 635 if (!xpt_cmd) { 636 pr_err("Unable to allocate xcopy_pt_cmd\n"); 637 return -ENOMEM; 638 } 639 init_completion(&xpt_cmd->xpt_passthrough_sem); 640 se_cmd = &xpt_cmd->se_cmd; 641 642 memset(&cdb[0], 0, 16); 643 cdb[0] = READ_16; 644 put_unaligned_be64(src_lba, &cdb[2]); 645 put_unaligned_be32(src_sectors, &cdb[10]); 646 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", 647 (unsigned long long)src_lba, src_sectors, length); 648 649 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 650 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 651 xop->src_pt_cmd = xpt_cmd; 652 653 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0], 654 remote_port, true); 655 if (rc < 0) { 656 transport_generic_free_cmd(se_cmd, 0); 657 return rc; 658 } 659 660 xop->xop_data_sg = se_cmd->t_data_sg; 661 xop->xop_data_nents = se_cmd->t_data_nents; 662 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" 663 " memory\n", xop->xop_data_sg, xop->xop_data_nents); 664 665 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 666 if (rc < 0) { 667 transport_generic_free_cmd(se_cmd, 0); 668 return rc; 669 } 670 /* 671 * Clear off the allocated t_data_sg, that has been saved for 672 * zero-copy WRITE submission reuse in struct xcopy_op.. 673 */ 674 se_cmd->t_data_sg = NULL; 675 se_cmd->t_data_nents = 0; 676 677 return 0; 678 } 679 680 static int target_xcopy_write_destination( 681 struct se_cmd *ec_cmd, 682 struct xcopy_op *xop, 683 struct se_device *dst_dev, 684 sector_t dst_lba, 685 u32 dst_sectors) 686 { 687 struct xcopy_pt_cmd *xpt_cmd; 688 struct se_cmd *se_cmd; 689 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); 690 int rc; 691 unsigned char cdb[16]; 692 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); 693 694 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); 695 if (!xpt_cmd) { 696 pr_err("Unable to allocate xcopy_pt_cmd\n"); 697 return -ENOMEM; 698 } 699 init_completion(&xpt_cmd->xpt_passthrough_sem); 700 se_cmd = &xpt_cmd->se_cmd; 701 702 memset(&cdb[0], 0, 16); 703 cdb[0] = WRITE_16; 704 put_unaligned_be64(dst_lba, &cdb[2]); 705 put_unaligned_be32(dst_sectors, &cdb[10]); 706 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", 707 (unsigned long long)dst_lba, dst_sectors, length); 708 709 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, 710 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); 711 xop->dst_pt_cmd = xpt_cmd; 712 713 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0], 714 remote_port, false); 715 if (rc < 0) { 716 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd; 717 /* 718 * If the failure happened before the t_mem_list hand-off in 719 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that 720 * core releases this memory on error during X-COPY WRITE I/O. 721 */ 722 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 723 src_cmd->t_data_sg = xop->xop_data_sg; 724 src_cmd->t_data_nents = xop->xop_data_nents; 725 726 transport_generic_free_cmd(se_cmd, 0); 727 return rc; 728 } 729 730 rc = target_xcopy_issue_pt_cmd(xpt_cmd); 731 if (rc < 0) { 732 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 733 transport_generic_free_cmd(se_cmd, 0); 734 return rc; 735 } 736 737 return 0; 738 } 739 740 static void target_xcopy_do_work(struct work_struct *work) 741 { 742 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); 743 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev; 744 struct se_cmd *ec_cmd = xop->xop_se_cmd; 745 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba; 746 unsigned int max_sectors; 747 int rc; 748 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0; 749 750 end_lba = src_lba + nolb; 751 /* 752 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the 753 * smallest max_sectors between src_dev + dev_dev, or 754 */ 755 max_sectors = min(src_dev->dev_attrib.hw_max_sectors, 756 dst_dev->dev_attrib.hw_max_sectors); 757 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); 758 759 max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); 760 761 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", 762 nolb, max_nolb, (unsigned long long)end_lba); 763 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", 764 (unsigned long long)src_lba, (unsigned long long)dst_lba); 765 766 while (src_lba < end_lba) { 767 cur_nolb = min(nolb, max_nolb); 768 769 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," 770 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); 771 772 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); 773 if (rc < 0) 774 goto out; 775 776 src_lba += cur_nolb; 777 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", 778 (unsigned long long)src_lba); 779 780 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," 781 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); 782 783 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, 784 dst_lba, cur_nolb); 785 if (rc < 0) { 786 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 787 goto out; 788 } 789 790 dst_lba += cur_nolb; 791 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", 792 (unsigned long long)dst_lba); 793 794 copied_nolb += cur_nolb; 795 nolb -= cur_nolb; 796 797 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); 798 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 799 800 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0); 801 } 802 803 xcopy_pt_undepend_remotedev(xop); 804 kfree(xop); 805 806 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", 807 (unsigned long long)src_lba, (unsigned long long)dst_lba); 808 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", 809 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); 810 811 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); 812 target_complete_cmd(ec_cmd, SAM_STAT_GOOD); 813 return; 814 815 out: 816 xcopy_pt_undepend_remotedev(xop); 817 kfree(xop); 818 819 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n"); 820 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 821 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION); 822 } 823 824 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) 825 { 826 struct se_device *dev = se_cmd->se_dev; 827 struct xcopy_op *xop = NULL; 828 unsigned char *p = NULL, *seg_desc; 829 unsigned int list_id, list_id_usage, sdll, inline_dl, sa; 830 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; 831 int rc; 832 unsigned short tdll; 833 834 if (!dev->dev_attrib.emulate_3pc) { 835 pr_err("EXTENDED_COPY operation explicitly disabled\n"); 836 return TCM_UNSUPPORTED_SCSI_OPCODE; 837 } 838 839 sa = se_cmd->t_task_cdb[1] & 0x1f; 840 if (sa != 0x00) { 841 pr_err("EXTENDED_COPY(LID4) not supported\n"); 842 return TCM_UNSUPPORTED_SCSI_OPCODE; 843 } 844 845 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); 846 if (!xop) { 847 pr_err("Unable to allocate xcopy_op\n"); 848 return TCM_OUT_OF_RESOURCES; 849 } 850 xop->xop_se_cmd = se_cmd; 851 852 p = transport_kmap_data_sg(se_cmd); 853 if (!p) { 854 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); 855 kfree(xop); 856 return TCM_OUT_OF_RESOURCES; 857 } 858 859 list_id = p[0]; 860 list_id_usage = (p[1] & 0x18) >> 3; 861 862 /* 863 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH 864 */ 865 tdll = get_unaligned_be16(&p[2]); 866 sdll = get_unaligned_be32(&p[8]); 867 868 inline_dl = get_unaligned_be32(&p[12]); 869 if (inline_dl != 0) { 870 pr_err("XCOPY with non zero inline data length\n"); 871 goto out; 872 } 873 874 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" 875 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, 876 tdll, sdll, inline_dl); 877 878 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll); 879 if (rc <= 0) 880 goto out; 881 882 if (xop->src_dev->dev_attrib.block_size != 883 xop->dst_dev->dev_attrib.block_size) { 884 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" 885 " block_size: %u currently unsupported\n", 886 xop->src_dev->dev_attrib.block_size, 887 xop->dst_dev->dev_attrib.block_size); 888 xcopy_pt_undepend_remotedev(xop); 889 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 890 goto out; 891 } 892 893 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, 894 rc * XCOPY_TARGET_DESC_LEN); 895 seg_desc = &p[16]; 896 seg_desc += (rc * XCOPY_TARGET_DESC_LEN); 897 898 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll); 899 if (rc <= 0) { 900 xcopy_pt_undepend_remotedev(xop); 901 goto out; 902 } 903 transport_kunmap_data_sg(se_cmd); 904 905 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, 906 rc * XCOPY_SEGMENT_DESC_LEN); 907 INIT_WORK(&xop->xop_work, target_xcopy_do_work); 908 queue_work(xcopy_wq, &xop->xop_work); 909 return TCM_NO_SENSE; 910 911 out: 912 if (p) 913 transport_kunmap_data_sg(se_cmd); 914 kfree(xop); 915 return ret; 916 } 917 918 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) 919 { 920 unsigned char *p; 921 922 p = transport_kmap_data_sg(se_cmd); 923 if (!p) { 924 pr_err("transport_kmap_data_sg failed in" 925 " target_rcr_operating_parameters\n"); 926 return TCM_OUT_OF_RESOURCES; 927 } 928 929 if (se_cmd->data_length < 54) { 930 pr_err("Receive Copy Results Op Parameters length" 931 " too small: %u\n", se_cmd->data_length); 932 transport_kunmap_data_sg(se_cmd); 933 return TCM_INVALID_CDB_FIELD; 934 } 935 /* 936 * Set SNLID=1 (Supports no List ID) 937 */ 938 p[4] = 0x1; 939 /* 940 * MAXIMUM TARGET DESCRIPTOR COUNT 941 */ 942 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); 943 /* 944 * MAXIMUM SEGMENT DESCRIPTOR COUNT 945 */ 946 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); 947 /* 948 * MAXIMUM DESCRIPTOR LIST LENGTH 949 */ 950 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); 951 /* 952 * MAXIMUM SEGMENT LENGTH 953 */ 954 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); 955 /* 956 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) 957 */ 958 put_unaligned_be32(0x0, &p[20]); 959 /* 960 * HELD DATA LIMIT 961 */ 962 put_unaligned_be32(0x0, &p[24]); 963 /* 964 * MAXIMUM STREAM DEVICE TRANSFER SIZE 965 */ 966 put_unaligned_be32(0x0, &p[28]); 967 /* 968 * TOTAL CONCURRENT COPIES 969 */ 970 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); 971 /* 972 * MAXIMUM CONCURRENT COPIES 973 */ 974 p[36] = RCR_OP_MAX_CONCURR_COPIES; 975 /* 976 * DATA SEGMENT GRANULARITY (log 2) 977 */ 978 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; 979 /* 980 * INLINE DATA GRANULARITY log 2) 981 */ 982 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; 983 /* 984 * HELD DATA GRANULARITY 985 */ 986 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; 987 /* 988 * IMPLEMENTED DESCRIPTOR LIST LENGTH 989 */ 990 p[43] = 0x2; 991 /* 992 * List of implemented descriptor type codes (ordered) 993 */ 994 p[44] = 0x02; /* Copy Block to Block device */ 995 p[45] = 0xe4; /* Identification descriptor target descriptor */ 996 997 /* 998 * AVAILABLE DATA (n-3) 999 */ 1000 put_unaligned_be32(42, &p[0]); 1001 1002 transport_kunmap_data_sg(se_cmd); 1003 target_complete_cmd(se_cmd, GOOD); 1004 1005 return TCM_NO_SENSE; 1006 } 1007 1008 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) 1009 { 1010 unsigned char *cdb = &se_cmd->t_task_cdb[0]; 1011 int sa = (cdb[1] & 0x1f), list_id = cdb[2]; 1012 sense_reason_t rc = TCM_NO_SENSE; 1013 1014 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" 1015 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); 1016 1017 if (list_id != 0) { 1018 pr_err("Receive Copy Results with non zero list identifier" 1019 " not supported\n"); 1020 return TCM_INVALID_CDB_FIELD; 1021 } 1022 1023 switch (sa) { 1024 case RCR_SA_OPERATING_PARAMETERS: 1025 rc = target_rcr_operating_parameters(se_cmd); 1026 break; 1027 case RCR_SA_COPY_STATUS: 1028 case RCR_SA_RECEIVE_DATA: 1029 case RCR_SA_FAILED_SEGMENT_DETAILS: 1030 default: 1031 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); 1032 return TCM_INVALID_CDB_FIELD; 1033 } 1034 1035 return rc; 1036 } 1037