drivers/target/target_core_xcopy.c

   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 <linux/ratelimit.h>
  29 #include <scsi/scsi_proto.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
  36 #include "target_core_internal.h"
  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 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
  44
  45 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
  46 {
  47         int off = 0;
  48
  49         buf[off++] = (0x6 << 4);
  50         buf[off++] = 0x01;
  51         buf[off++] = 0x40;
  52         buf[off] = (0x5 << 4);
  53
  54         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
  55         return 0;
  56 }
  57
  58 struct xcopy_dev_search_info {
  59         const unsigned char *dev_wwn;
  60         struct se_device *found_dev;
  61 };
  62
  63 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
  64                                               void *data)
  65 {
  66         struct xcopy_dev_search_info *info = data;
  67         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
  68         int rc;
  69
  70         if (!se_dev->dev_attrib.emulate_3pc)
  71                 return 0;
  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], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  77         if (rc != 0)
  78                 return 0;
  79
  80         info->found_dev = se_dev;
  81         pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
  82
  83         rc = target_depend_item(&se_dev->dev_group.cg_item);
  84         if (rc != 0) {
  85                 pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n",
  86                        rc, se_dev);
  87                 return rc;
  88         }
  89
  90         pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n",
  91                  se_dev, &se_dev->dev_group);
  92         return 1;
  93 }
  94
  95 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
  96                                         struct se_device **found_dev)
  97 {
  98         struct xcopy_dev_search_info info;
  99         int ret;
 100
 101         memset(&info, 0, sizeof(info));
 102         info.dev_wwn = dev_wwn;
 103
 104         ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info);
 105         if (ret == 1) {
 106                 *found_dev = info.found_dev;
 107                 return 0;
 108         } else {
 109                 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 110                 return -EINVAL;
 111         }
 112 }
 113
 114 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 115                                 unsigned char *p, unsigned short cscd_index)
 116 {
 117         unsigned char *desc = p;
 118         unsigned short ript;
 119         u8 desig_len;
 120         /*
 121          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 122          */
 123         ript = get_unaligned_be16(&desc[2]);
 124         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 125         /*
 126          * Check for supported code set, association, and designator type
 127          */
 128         if ((desc[4] & 0x0f) != 0x1) {
 129                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 130                 return -EINVAL;
 131         }
 132         if ((desc[5] & 0x30) != 0x00) {
 133                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 134                 return -EINVAL;
 135         }
 136         if ((desc[5] & 0x0f) != 0x3) {
 137                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 138                                 (desc[5] & 0x0f));
 139                 return -EINVAL;
 140         }
 141         /*
 142          * Check for matching 16 byte length for NAA IEEE Registered Extended
 143          * Assigned designator
 144          */
 145         desig_len = desc[7];
 146         if (desig_len != 16) {
 147                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 148                 return -EINVAL;
 149         }
 150         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 151         /*
 152          * Check for NAA IEEE Registered Extended Assigned header..
 153          */
 154         if ((desc[8] & 0xf0) != 0x60) {
 155                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 156                                         (desc[8] & 0xf0));
 157                 return -EINVAL;
 158         }
 159
 160         if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
 161                 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
 162                          "dest\n", cscd_index);
 163                 return 0;
 164         }
 165
 166         if (cscd_index == xop->stdi) {
 167                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 168                 /*
 169                  * Determine if the source designator matches the local device
 170                  */
 171                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 172                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 173                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 174                         xop->src_dev = se_cmd->se_dev;
 175                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 176                                         " received xop\n", xop->src_dev);
 177                 }
 178         }
 179
 180         if (cscd_index == xop->dtdi) {
 181                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 182                 /*
 183                  * Determine if the destination designator matches the local
 184                  * device. If @cscd_index corresponds to both source (stdi) and
 185                  * destination (dtdi), or dtdi comes after stdi, then
 186                  * XCOL_DEST_RECV_OP wins.
 187                  */
 188                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 189                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 190                         xop->op_origin = XCOL_DEST_RECV_OP;
 191                         xop->dst_dev = se_cmd->se_dev;
 192                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 193                                 " received xop\n", xop->dst_dev);
 194                 }
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 201                                 struct xcopy_op *xop, unsigned char *p,
 202                                 unsigned short tdll, sense_reason_t *sense_ret)
 203 {
 204         struct se_device *local_dev = se_cmd->se_dev;
 205         unsigned char *desc = p;
 206         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
 207         unsigned short cscd_index = 0;
 208         unsigned short start = 0;
 209
 210         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 211
 212         if (offset != 0) {
 213                 pr_err("XCOPY target descriptor list length is not"
 214                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 215                 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 216                 return -EINVAL;
 217         }
 218         if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
 219                 pr_err("XCOPY target descriptor supports a maximum"
 220                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 221                 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
 222                 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
 223                 return -EINVAL;
 224         }
 225         /*
 226          * Generate an IEEE Registered Extended designator based upon the
 227          * se_device the XCOPY was received upon..
 228          */
 229         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 230         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 231
 232         while (start < tdll) {
 233                 /*
 234                  * Check target descriptor identification with 0xE4 type, and
 235                  * compare the current index with the CSCD descriptor IDs in
 236                  * the segment descriptor. Use VPD 0x83 WWPN matching ..
 237                  */
 238                 switch (desc[0]) {
 239                 case 0xe4:
 240                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 241                                                         &desc[0], cscd_index);
 242                         if (rc != 0)
 243                                 goto out;
 244                         start += XCOPY_TARGET_DESC_LEN;
 245                         desc += XCOPY_TARGET_DESC_LEN;
 246                         cscd_index++;
 247                         break;
 248                 default:
 249                         pr_err("XCOPY unsupported descriptor type code:"
 250                                         " 0x%02x\n", desc[0]);
 251                         *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 252                         goto out;
 253                 }
 254         }
 255
 256         switch (xop->op_origin) {
 257         case XCOL_SOURCE_RECV_OP:
 258                 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
 259                                                 &xop->dst_dev);
 260                 break;
 261         case XCOL_DEST_RECV_OP:
 262                 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
 263                                                 &xop->src_dev);
 264                 break;
 265         default:
 266                 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
 267                         "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
 268                 rc = -EINVAL;
 269                 break;
 270         }
 271         /*
 272          * If a matching IEEE NAA 0x83 descriptor for the requested device
 273          * is not located on this node, return COPY_ABORTED with ASQ/ASQC
 274          * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
 275          * initiator to fall back to normal copy method.
 276          */
 277         if (rc < 0) {
 278                 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
 279                 goto out;
 280         }
 281
 282         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 283                  xop->src_dev, &xop->src_tid_wwn[0]);
 284         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 285                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 286
 287         return cscd_index;
 288
 289 out:
 290         return -EINVAL;
 291 }
 292
 293 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 294                                         unsigned char *p)
 295 {
 296         unsigned char *desc = p;
 297         int dc = (desc[1] & 0x02);
 298         unsigned short desc_len;
 299
 300         desc_len = get_unaligned_be16(&desc[2]);
 301         if (desc_len != 0x18) {
 302                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 303                                 " %hu\n", desc_len);
 304                 return -EINVAL;
 305         }
 306
 307         xop->stdi = get_unaligned_be16(&desc[4]);
 308         xop->dtdi = get_unaligned_be16(&desc[6]);
 309
 310         if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
 311             xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
 312                 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
 313                         XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
 314                 return -EINVAL;
 315         }
 316
 317         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 318                 desc_len, xop->stdi, xop->dtdi, dc);
 319
 320         xop->nolb = get_unaligned_be16(&desc[10]);
 321         xop->src_lba = get_unaligned_be64(&desc[12]);
 322         xop->dst_lba = get_unaligned_be64(&desc[20]);
 323         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 324                 xop->nolb, (unsigned long long)xop->src_lba,
 325                 (unsigned long long)xop->dst_lba);
 326
 327         if (dc != 0) {
 328                 xop->dbl = get_unaligned_be24(&desc[29]);
 329
 330                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 331         }
 332         return 0;
 333 }
 334
 335 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 336                                 struct xcopy_op *xop, unsigned char *p,
 337                                 unsigned int sdll, sense_reason_t *sense_ret)
 338 {
 339         unsigned char *desc = p;
 340         unsigned int start = 0;
 341         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 342
 343         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 344
 345         if (offset != 0) {
 346                 pr_err("XCOPY segment descriptor list length is not"
 347                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 348                 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 349                 return -EINVAL;
 350         }
 351         if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
 352                 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
 353                         " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
 354                 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
 355                 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
 356                 return -EINVAL;
 357         }
 358
 359         while (start < sdll) {
 360                 /*
 361                  * Check segment descriptor type code for block -> block
 362                  */
 363                 switch (desc[0]) {
 364                 case 0x02:
 365                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 366                         if (rc < 0)
 367                                 goto out;
 368
 369                         ret++;
 370                         start += XCOPY_SEGMENT_DESC_LEN;
 371                         desc += XCOPY_SEGMENT_DESC_LEN;
 372                         break;
 373                 default:
 374                         pr_err("XCOPY unsupported segment descriptor"
 375                                 "type: 0x%02x\n", desc[0]);
 376                         *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 377                         goto out;
 378                 }
 379         }
 380
 381         return ret;
 382
 383 out:
 384         return -EINVAL;
 385 }
 386
 387 /*
 388  * Start xcopy_pt ops
 389  */
 390
 391 struct xcopy_pt_cmd {
 392         bool remote_port;
 393         struct se_cmd se_cmd;
 394         struct xcopy_op *xcopy_op;
 395         struct completion xpt_passthrough_sem;
 396         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 397 };
 398
 399 struct se_portal_group xcopy_pt_tpg;
 400 static struct se_session xcopy_pt_sess;
 401 static struct se_node_acl xcopy_pt_nacl;
 402
 403 static char *xcopy_pt_get_fabric_name(void)
 404 {
 405         return "xcopy-pt";
 406 }
 407
 408 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 409 {
 410         return 0;
 411 }
 412
 413 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 414 {
 415         struct se_device *remote_dev;
 416
 417         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 418                 remote_dev = xop->dst_dev;
 419         else
 420                 remote_dev = xop->src_dev;
 421
 422         pr_debug("Calling configfs_undepend_item for"
 423                   " remote_dev: %p remote_dev->dev_group: %p\n",
 424                   remote_dev, &remote_dev->dev_group.cg_item);
 425
 426         target_undepend_item(&remote_dev->dev_group.cg_item);
 427 }
 428
 429 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 430 {
 431         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 432                                 struct xcopy_pt_cmd, se_cmd);
 433
 434         kfree(xpt_cmd);
 435 }
 436
 437 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 438 {
 439         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 440                                 struct xcopy_pt_cmd, se_cmd);
 441
 442         complete(&xpt_cmd->xpt_passthrough_sem);
 443         return 0;
 444 }
 445
 446 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 447 {
 448         return 0;
 449 }
 450
 451 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 452 {
 453         return 0;
 454 }
 455
 456 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 457 {
 458         return 0;
 459 }
 460
 461 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 462 {
 463         return 0;
 464 }
 465
 466 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 467         .get_fabric_name        = xcopy_pt_get_fabric_name,
 468         .get_cmd_state          = xcopy_pt_get_cmd_state,
 469         .release_cmd            = xcopy_pt_release_cmd,
 470         .check_stop_free        = xcopy_pt_check_stop_free,
 471         .write_pending          = xcopy_pt_write_pending,
 472         .write_pending_status   = xcopy_pt_write_pending_status,
 473         .queue_data_in          = xcopy_pt_queue_data_in,
 474         .queue_status           = xcopy_pt_queue_status,
 475 };
 476
 477 /*
 478  * End xcopy_pt_ops
 479  */
 480
 481 int target_xcopy_setup_pt(void)
 482 {
 483         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 484         if (!xcopy_wq) {
 485                 pr_err("Unable to allocate xcopy_wq\n");
 486                 return -ENOMEM;
 487         }
 488
 489         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 490         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 491         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 492         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 493
 494         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 495
 496         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 497         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 498         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 499         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 500         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 501         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 502         INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
 503         spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
 504
 505         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 506         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 507
 508         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 509         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 510
 511         return 0;
 512 }
 513
 514 void target_xcopy_release_pt(void)
 515 {
 516         if (xcopy_wq)
 517                 destroy_workqueue(xcopy_wq);
 518 }
 519
 520 static void target_xcopy_setup_pt_port(
 521         struct xcopy_pt_cmd *xpt_cmd,
 522         struct xcopy_op *xop,
 523         bool remote_port)
 524 {
 525         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 526         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 527
 528         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 529                 /*
 530                  * Honor destination port reservations for X-COPY PUSH emulation
 531                  * when CDB is received on local source port, and READs blocks to
 532                  * WRITE on remote destination port.
 533                  */
 534                 if (remote_port) {
 535                         xpt_cmd->remote_port = remote_port;
 536                 } else {
 537                         pt_cmd->se_lun = ec_cmd->se_lun;
 538                         pt_cmd->se_dev = ec_cmd->se_dev;
 539
 540                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 541                                 " %p\n", pt_cmd->se_dev);
 542                         pt_cmd->se_lun = ec_cmd->se_lun;
 543                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 544                                 pt_cmd->se_lun);
 545                 }
 546         } else {
 547                 /*
 548                  * Honor source port reservation for X-COPY PULL emulation
 549                  * when CDB is received on local desintation port, and READs
 550                  * blocks from the remote source port to WRITE on local
 551                  * destination port.
 552                  */
 553                 if (remote_port) {
 554                         xpt_cmd->remote_port = remote_port;
 555                 } else {
 556                         pt_cmd->se_lun = ec_cmd->se_lun;
 557                         pt_cmd->se_dev = ec_cmd->se_dev;
 558
 559                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 560                                 " %p\n", pt_cmd->se_dev);
 561                         pt_cmd->se_lun = ec_cmd->se_lun;
 562                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 563                                 pt_cmd->se_lun);
 564                 }
 565         }
 566 }
 567
 568 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 569                 struct se_cmd *pt_cmd, bool remote_port)
 570 {
 571         /*
 572          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 573          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 574          * target_xcopy_setup_pt_port()
 575          */
 576         if (remote_port) {
 577                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 578                         pt_cmd->se_dev);
 579                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 580                 pt_cmd->se_dev = se_dev;
 581         }
 582
 583         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 584 }
 585
 586 static int target_xcopy_setup_pt_cmd(
 587         struct xcopy_pt_cmd *xpt_cmd,
 588         struct xcopy_op *xop,
 589         struct se_device *se_dev,
 590         unsigned char *cdb,
 591         bool remote_port,
 592         bool alloc_mem)
 593 {
 594         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 595         sense_reason_t sense_rc;
 596         int ret = 0, rc;
 597         /*
 598          * Setup LUN+port to honor reservations based upon xop->op_origin for
 599          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 600          */
 601         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 602
 603         xpt_cmd->xcopy_op = xop;
 604         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 605
 606         cmd->tag = 0;
 607         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 608         if (sense_rc) {
 609                 ret = -EINVAL;
 610                 goto out;
 611         }
 612
 613         if (alloc_mem) {
 614                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 615                                       cmd->data_length, false, false);
 616                 if (rc < 0) {
 617                         ret = rc;
 618                         goto out;
 619                 }
 620                 /*
 621                  * Set this bit so that transport_free_pages() allows the
 622                  * caller to release SGLs + physical memory allocated by
 623                  * transport_generic_get_mem()..
 624                  */
 625                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 626         } else {
 627                 /*
 628                  * Here the previously allocated SGLs for the internal READ
 629                  * are mapped zero-copy to the internal WRITE.
 630                  */
 631                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 632                                         xop->xop_data_sg, xop->xop_data_nents,
 633                                         NULL, 0);
 634                 if (sense_rc) {
 635                         ret = -EINVAL;
 636                         goto out;
 637                 }
 638
 639                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 640                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 641         }
 642
 643         return 0;
 644
 645 out:
 646         return ret;
 647 }
 648
 649 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 650 {
 651         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 652         sense_reason_t sense_rc;
 653
 654         sense_rc = transport_generic_new_cmd(se_cmd);
 655         if (sense_rc)
 656                 return -EINVAL;
 657
 658         if (se_cmd->data_direction == DMA_TO_DEVICE)
 659                 target_execute_cmd(se_cmd);
 660
 661         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 662
 663         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 664                         se_cmd->scsi_status);
 665
 666         return (se_cmd->scsi_status) ? -EINVAL : 0;
 667 }
 668
 669 static int target_xcopy_read_source(
 670         struct se_cmd *ec_cmd,
 671         struct xcopy_op *xop,
 672         struct se_device *src_dev,
 673         sector_t src_lba,
 674         u32 src_sectors)
 675 {
 676         struct xcopy_pt_cmd *xpt_cmd;
 677         struct se_cmd *se_cmd;
 678         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 679         int rc;
 680         unsigned char cdb[16];
 681         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 682
 683         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 684         if (!xpt_cmd) {
 685                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 686                 return -ENOMEM;
 687         }
 688         init_completion(&xpt_cmd->xpt_passthrough_sem);
 689         se_cmd = &xpt_cmd->se_cmd;
 690
 691         memset(&cdb[0], 0, 16);
 692         cdb[0] = READ_16;
 693         put_unaligned_be64(src_lba, &cdb[2]);
 694         put_unaligned_be32(src_sectors, &cdb[10]);
 695         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 696                 (unsigned long long)src_lba, src_sectors, length);
 697
 698         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 699                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 700         xop->src_pt_cmd = xpt_cmd;
 701
 702         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 703                                 remote_port, true);
 704         if (rc < 0) {
 705                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 706                 transport_generic_free_cmd(se_cmd, 0);
 707                 return rc;
 708         }
 709
 710         xop->xop_data_sg = se_cmd->t_data_sg;
 711         xop->xop_data_nents = se_cmd->t_data_nents;
 712         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 713                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 714
 715         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 716         if (rc < 0) {
 717                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 718                 transport_generic_free_cmd(se_cmd, 0);
 719                 return rc;
 720         }
 721         /*
 722          * Clear off the allocated t_data_sg, that has been saved for
 723          * zero-copy WRITE submission reuse in struct xcopy_op..
 724          */
 725         se_cmd->t_data_sg = NULL;
 726         se_cmd->t_data_nents = 0;
 727
 728         return 0;
 729 }
 730
 731 static int target_xcopy_write_destination(
 732         struct se_cmd *ec_cmd,
 733         struct xcopy_op *xop,
 734         struct se_device *dst_dev,
 735         sector_t dst_lba,
 736         u32 dst_sectors)
 737 {
 738         struct xcopy_pt_cmd *xpt_cmd;
 739         struct se_cmd *se_cmd;
 740         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 741         int rc;
 742         unsigned char cdb[16];
 743         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 744
 745         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 746         if (!xpt_cmd) {
 747                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 748                 return -ENOMEM;
 749         }
 750         init_completion(&xpt_cmd->xpt_passthrough_sem);
 751         se_cmd = &xpt_cmd->se_cmd;
 752
 753         memset(&cdb[0], 0, 16);
 754         cdb[0] = WRITE_16;
 755         put_unaligned_be64(dst_lba, &cdb[2]);
 756         put_unaligned_be32(dst_sectors, &cdb[10]);
 757         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 758                 (unsigned long long)dst_lba, dst_sectors, length);
 759
 760         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 761                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 762         xop->dst_pt_cmd = xpt_cmd;
 763
 764         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 765                                 remote_port, false);
 766         if (rc < 0) {
 767                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 768                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 769                 /*
 770                  * If the failure happened before the t_mem_list hand-off in
 771                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 772                  * core releases this memory on error during X-COPY WRITE I/O.
 773                  */
 774                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 775                 src_cmd->t_data_sg = xop->xop_data_sg;
 776                 src_cmd->t_data_nents = xop->xop_data_nents;
 777
 778                 transport_generic_free_cmd(se_cmd, 0);
 779                 return rc;
 780         }
 781
 782         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 783         if (rc < 0) {
 784                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 785                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 786                 transport_generic_free_cmd(se_cmd, 0);
 787                 return rc;
 788         }
 789
 790         return 0;
 791 }
 792
 793 static void target_xcopy_do_work(struct work_struct *work)
 794 {
 795         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 796         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 797         struct se_device *src_dev, *dst_dev;
 798         sector_t src_lba, dst_lba, end_lba;
 799         unsigned int max_sectors;
 800         int rc = 0;
 801         unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
 802
 803         if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
 804                 goto err_free;
 805
 806         if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
 807                 goto err_free;
 808
 809         src_dev = xop->src_dev;
 810         dst_dev = xop->dst_dev;
 811         src_lba = xop->src_lba;
 812         dst_lba = xop->dst_lba;
 813         nolb = xop->nolb;
 814         end_lba = src_lba + nolb;
 815         /*
 816          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 817          * smallest max_sectors between src_dev + dev_dev, or
 818          */
 819         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 820                           dst_dev->dev_attrib.hw_max_sectors);
 821         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 822
 823         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 824
 825         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 826                         nolb, max_nolb, (unsigned long long)end_lba);
 827         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 828                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 829
 830         while (src_lba < end_lba) {
 831                 cur_nolb = min(nolb, max_nolb);
 832
 833                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 834                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 835
 836                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 837                 if (rc < 0)
 838                         goto out;
 839
 840                 src_lba += cur_nolb;
 841                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 842                                 (unsigned long long)src_lba);
 843
 844                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 845                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 846
 847                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 848                                                 dst_lba, cur_nolb);
 849                 if (rc < 0) {
 850                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 851                         goto out;
 852                 }
 853
 854                 dst_lba += cur_nolb;
 855                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 856                                 (unsigned long long)dst_lba);
 857
 858                 copied_nolb += cur_nolb;
 859                 nolb -= cur_nolb;
 860
 861                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 862                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 863
 864                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 865         }
 866
 867         xcopy_pt_undepend_remotedev(xop);
 868         kfree(xop);
 869
 870         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 871                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 872         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 873                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 874
 875         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 876         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 877         return;
 878
 879 out:
 880         xcopy_pt_undepend_remotedev(xop);
 881
 882 err_free:
 883         kfree(xop);
 884         /*
 885          * Don't override an error scsi status if it has already been set
 886          */
 887         if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
 888                 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
 889                         " CHECK_CONDITION -> sending response\n", rc);
 890                 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 891         }
 892         target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
 893 }
 894
 895 /*
 896  * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
 897  * fails.
 898  */
 899 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
 900 {
 901         struct se_cmd *se_cmd = xop->xop_se_cmd;
 902         unsigned char *p = NULL, *seg_desc;
 903         unsigned int list_id, list_id_usage, sdll, inline_dl;
 904         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 905         int rc;
 906         unsigned short tdll;
 907
 908         p = transport_kmap_data_sg(se_cmd);
 909         if (!p) {
 910                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 911                 return TCM_OUT_OF_RESOURCES;
 912         }
 913
 914         list_id = p[0];
 915         list_id_usage = (p[1] & 0x18) >> 3;
 916
 917         /*
 918          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 919          */
 920         tdll = get_unaligned_be16(&p[2]);
 921         sdll = get_unaligned_be32(&p[8]);
 922         if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
 923                 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
 924                        tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
 925                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 926                 goto out;
 927         }
 928
 929         inline_dl = get_unaligned_be32(&p[12]);
 930         if (inline_dl != 0) {
 931                 pr_err("XCOPY with non zero inline data length\n");
 932                 goto out;
 933         }
 934
 935         if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
 936                 pr_err("XCOPY parameter truncation: data length %u too small "
 937                         "for tdll: %hu sdll: %u inline_dl: %u\n",
 938                         se_cmd->data_length, tdll, sdll, inline_dl);
 939                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 940                 goto out;
 941         }
 942
 943         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 944                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 945                 tdll, sdll, inline_dl);
 946
 947         /*
 948          * skip over the target descriptors until segment descriptors
 949          * have been passed - CSCD ids are needed to determine src and dest.
 950          */
 951         seg_desc = &p[16] + tdll;
 952
 953         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
 954                                                     sdll, &ret);
 955         if (rc <= 0)
 956                 goto out;
 957
 958         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 959                                 rc * XCOPY_SEGMENT_DESC_LEN);
 960
 961         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
 962         if (rc <= 0)
 963                 goto out;
 964
 965         if (xop->src_dev->dev_attrib.block_size !=
 966             xop->dst_dev->dev_attrib.block_size) {
 967                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 968                        " block_size: %u currently unsupported\n",
 969                         xop->src_dev->dev_attrib.block_size,
 970                         xop->dst_dev->dev_attrib.block_size);
 971                 xcopy_pt_undepend_remotedev(xop);
 972                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 973                 goto out;
 974         }
 975
 976         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 977                                 rc * XCOPY_TARGET_DESC_LEN);
 978         transport_kunmap_data_sg(se_cmd);
 979         return TCM_NO_SENSE;
 980
 981 out:
 982         if (p)
 983                 transport_kunmap_data_sg(se_cmd);
 984         return ret;
 985 }
 986
 987 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 988 {
 989         struct se_device *dev = se_cmd->se_dev;
 990         struct xcopy_op *xop;
 991         unsigned int sa;
 992
 993         if (!dev->dev_attrib.emulate_3pc) {
 994                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 995                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 996         }
 997
 998         sa = se_cmd->t_task_cdb[1] & 0x1f;
 999         if (sa != 0x00) {
1000                 pr_err("EXTENDED_COPY(LID4) not supported\n");
1001                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1002         }
1003
1004         if (se_cmd->data_length == 0) {
1005                 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1006                 return TCM_NO_SENSE;
1007         }
1008         if (se_cmd->data_length < XCOPY_HDR_LEN) {
1009                 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
1010                                 se_cmd->data_length, XCOPY_HDR_LEN);
1011                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1012         }
1013
1014         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1015         if (!xop)
1016                 goto err;
1017         xop->xop_se_cmd = se_cmd;
1018         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1019         if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1020                 goto free;
1021         return TCM_NO_SENSE;
1022
1023 free:
1024         kfree(xop);
1025
1026 err:
1027         return TCM_OUT_OF_RESOURCES;
1028 }
1029
1030 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1031 {
1032         unsigned char *p;
1033
1034         p = transport_kmap_data_sg(se_cmd);
1035         if (!p) {
1036                 pr_err("transport_kmap_data_sg failed in"
1037                        " target_rcr_operating_parameters\n");
1038                 return TCM_OUT_OF_RESOURCES;
1039         }
1040
1041         if (se_cmd->data_length < 54) {
1042                 pr_err("Receive Copy Results Op Parameters length"
1043                        " too small: %u\n", se_cmd->data_length);
1044                 transport_kunmap_data_sg(se_cmd);
1045                 return TCM_INVALID_CDB_FIELD;
1046         }
1047         /*
1048          * Set SNLID=1 (Supports no List ID)
1049          */
1050         p[4] = 0x1;
1051         /*
1052          * MAXIMUM TARGET DESCRIPTOR COUNT
1053          */
1054         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1055         /*
1056          * MAXIMUM SEGMENT DESCRIPTOR COUNT
1057          */
1058         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1059         /*
1060          * MAXIMUM DESCRIPTOR LIST LENGTH
1061          */
1062         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1063         /*
1064          * MAXIMUM SEGMENT LENGTH
1065          */
1066         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1067         /*
1068          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1069          */
1070         put_unaligned_be32(0x0, &p[20]);
1071         /*
1072          * HELD DATA LIMIT
1073          */
1074         put_unaligned_be32(0x0, &p[24]);
1075         /*
1076          * MAXIMUM STREAM DEVICE TRANSFER SIZE
1077          */
1078         put_unaligned_be32(0x0, &p[28]);
1079         /*
1080          * TOTAL CONCURRENT COPIES
1081          */
1082         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1083         /*
1084          * MAXIMUM CONCURRENT COPIES
1085          */
1086         p[36] = RCR_OP_MAX_CONCURR_COPIES;
1087         /*
1088          * DATA SEGMENT GRANULARITY (log 2)
1089          */
1090         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1091         /*
1092          * INLINE DATA GRANULARITY log 2)
1093          */
1094         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1095         /*
1096          * HELD DATA GRANULARITY
1097          */
1098         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1099         /*
1100          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1101          */
1102         p[43] = 0x2;
1103         /*
1104          * List of implemented descriptor type codes (ordered)
1105          */
1106         p[44] = 0x02; /* Copy Block to Block device */
1107         p[45] = 0xe4; /* Identification descriptor target descriptor */
1108
1109         /*
1110          * AVAILABLE DATA (n-3)
1111          */
1112         put_unaligned_be32(42, &p[0]);
1113
1114         transport_kunmap_data_sg(se_cmd);
1115         target_complete_cmd(se_cmd, GOOD);
1116
1117         return TCM_NO_SENSE;
1118 }
1119
1120 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1121 {
1122         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1123         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1124         sense_reason_t rc = TCM_NO_SENSE;
1125
1126         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1127                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1128
1129         if (list_id != 0) {
1130                 pr_err("Receive Copy Results with non zero list identifier"
1131                        " not supported\n");
1132                 return TCM_INVALID_CDB_FIELD;
1133         }
1134
1135         switch (sa) {
1136         case RCR_SA_OPERATING_PARAMETERS:
1137                 rc = target_rcr_operating_parameters(se_cmd);
1138                 break;
1139         case RCR_SA_COPY_STATUS:
1140         case RCR_SA_RECEIVE_DATA:
1141         case RCR_SA_FAILED_SEGMENT_DETAILS:
1142         default:
1143                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1144                 return TCM_INVALID_CDB_FIELD;
1145         }
1146
1147         return rc;
1148 }