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 completion xpt_passthrough_sem;
 395         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 396 };
 397
 398 struct se_portal_group xcopy_pt_tpg;
 399 static struct se_session xcopy_pt_sess;
 400 static struct se_node_acl xcopy_pt_nacl;
 401
 402 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 403 {
 404         return 0;
 405 }
 406
 407 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 408 {
 409         struct se_device *remote_dev;
 410
 411         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 412                 remote_dev = xop->dst_dev;
 413         else
 414                 remote_dev = xop->src_dev;
 415
 416         pr_debug("Calling configfs_undepend_item for"
 417                   " remote_dev: %p remote_dev->dev_group: %p\n",
 418                   remote_dev, &remote_dev->dev_group.cg_item);
 419
 420         target_undepend_item(&remote_dev->dev_group.cg_item);
 421 }
 422
 423 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 424 {
 425         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 426                                 struct xcopy_pt_cmd, se_cmd);
 427
 428         kfree(xpt_cmd);
 429 }
 430
 431 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 432 {
 433         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 434                                 struct xcopy_pt_cmd, se_cmd);
 435
 436         complete(&xpt_cmd->xpt_passthrough_sem);
 437         return 0;
 438 }
 439
 440 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 441 {
 442         return 0;
 443 }
 444
 445 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 446 {
 447         return 0;
 448 }
 449
 450 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 451 {
 452         return 0;
 453 }
 454
 455 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 456         .fabric_name            = "xcopy-pt",
 457         .get_cmd_state          = xcopy_pt_get_cmd_state,
 458         .release_cmd            = xcopy_pt_release_cmd,
 459         .check_stop_free        = xcopy_pt_check_stop_free,
 460         .write_pending          = xcopy_pt_write_pending,
 461         .queue_data_in          = xcopy_pt_queue_data_in,
 462         .queue_status           = xcopy_pt_queue_status,
 463 };
 464
 465 /*
 466  * End xcopy_pt_ops
 467  */
 468
 469 int target_xcopy_setup_pt(void)
 470 {
 471         int ret;
 472
 473         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 474         if (!xcopy_wq) {
 475                 pr_err("Unable to allocate xcopy_wq\n");
 476                 return -ENOMEM;
 477         }
 478
 479         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 480         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 481         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 482         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 483
 484         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 485
 486         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 487         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 488         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 489         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 490         ret = transport_init_session(&xcopy_pt_sess);
 491         if (ret < 0)
 492                 return ret;
 493
 494         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 495         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 496
 497         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 498         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 499
 500         return 0;
 501 }
 502
 503 void target_xcopy_release_pt(void)
 504 {
 505         if (xcopy_wq)
 506                 destroy_workqueue(xcopy_wq);
 507 }
 508
 509 static void target_xcopy_setup_pt_port(
 510         struct xcopy_pt_cmd *xpt_cmd,
 511         struct xcopy_op *xop,
 512         bool remote_port)
 513 {
 514         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 515         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 516
 517         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 518                 /*
 519                  * Honor destination port reservations for X-COPY PUSH emulation
 520                  * when CDB is received on local source port, and READs blocks to
 521                  * WRITE on remote destination port.
 522                  */
 523                 if (remote_port) {
 524                         xpt_cmd->remote_port = remote_port;
 525                 } else {
 526                         pt_cmd->se_lun = ec_cmd->se_lun;
 527                         pt_cmd->se_dev = ec_cmd->se_dev;
 528
 529                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 530                                 " %p\n", pt_cmd->se_dev);
 531                         pt_cmd->se_lun = ec_cmd->se_lun;
 532                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 533                                 pt_cmd->se_lun);
 534                 }
 535         } else {
 536                 /*
 537                  * Honor source port reservation for X-COPY PULL emulation
 538                  * when CDB is received on local desintation port, and READs
 539                  * blocks from the remote source port to WRITE on local
 540                  * destination port.
 541                  */
 542                 if (remote_port) {
 543                         xpt_cmd->remote_port = remote_port;
 544                 } else {
 545                         pt_cmd->se_lun = ec_cmd->se_lun;
 546                         pt_cmd->se_dev = ec_cmd->se_dev;
 547
 548                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 549                                 " %p\n", pt_cmd->se_dev);
 550                         pt_cmd->se_lun = ec_cmd->se_lun;
 551                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 552                                 pt_cmd->se_lun);
 553                 }
 554         }
 555 }
 556
 557 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 558                 struct se_cmd *pt_cmd, bool remote_port)
 559 {
 560         /*
 561          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 562          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 563          * target_xcopy_setup_pt_port()
 564          */
 565         if (remote_port) {
 566                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 567                         pt_cmd->se_dev);
 568                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 569                 pt_cmd->se_dev = se_dev;
 570         }
 571
 572         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 573 }
 574
 575 static int target_xcopy_setup_pt_cmd(
 576         struct xcopy_pt_cmd *xpt_cmd,
 577         struct xcopy_op *xop,
 578         struct se_device *se_dev,
 579         unsigned char *cdb,
 580         bool remote_port,
 581         bool alloc_mem)
 582 {
 583         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 584         sense_reason_t sense_rc;
 585         int ret = 0, rc;
 586         /*
 587          * Setup LUN+port to honor reservations based upon xop->op_origin for
 588          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 589          */
 590         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 591         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 592
 593         cmd->tag = 0;
 594         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 595         if (sense_rc) {
 596                 ret = -EINVAL;
 597                 goto out;
 598         }
 599
 600         if (alloc_mem) {
 601                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 602                                       cmd->data_length, false, false);
 603                 if (rc < 0) {
 604                         ret = rc;
 605                         goto out;
 606                 }
 607                 /*
 608                  * Set this bit so that transport_free_pages() allows the
 609                  * caller to release SGLs + physical memory allocated by
 610                  * transport_generic_get_mem()..
 611                  */
 612                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 613         } else {
 614                 /*
 615                  * Here the previously allocated SGLs for the internal READ
 616                  * are mapped zero-copy to the internal WRITE.
 617                  */
 618                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 619                                         xop->xop_data_sg, xop->xop_data_nents,
 620                                         NULL, 0);
 621                 if (sense_rc) {
 622                         ret = -EINVAL;
 623                         goto out;
 624                 }
 625
 626                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 627                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 628         }
 629
 630         return 0;
 631
 632 out:
 633         return ret;
 634 }
 635
 636 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 637 {
 638         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 639         sense_reason_t sense_rc;
 640
 641         sense_rc = transport_generic_new_cmd(se_cmd);
 642         if (sense_rc)
 643                 return -EINVAL;
 644
 645         if (se_cmd->data_direction == DMA_TO_DEVICE)
 646                 target_execute_cmd(se_cmd);
 647
 648         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 649
 650         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 651                         se_cmd->scsi_status);
 652
 653         return (se_cmd->scsi_status) ? -EINVAL : 0;
 654 }
 655
 656 static int target_xcopy_read_source(
 657         struct se_cmd *ec_cmd,
 658         struct xcopy_op *xop,
 659         struct se_device *src_dev,
 660         sector_t src_lba,
 661         u32 src_sectors)
 662 {
 663         struct xcopy_pt_cmd *xpt_cmd;
 664         struct se_cmd *se_cmd;
 665         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 666         int rc;
 667         unsigned char cdb[16];
 668         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 669
 670         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 671         if (!xpt_cmd) {
 672                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 673                 return -ENOMEM;
 674         }
 675         init_completion(&xpt_cmd->xpt_passthrough_sem);
 676         se_cmd = &xpt_cmd->se_cmd;
 677
 678         memset(&cdb[0], 0, 16);
 679         cdb[0] = READ_16;
 680         put_unaligned_be64(src_lba, &cdb[2]);
 681         put_unaligned_be32(src_sectors, &cdb[10]);
 682         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 683                 (unsigned long long)src_lba, src_sectors, length);
 684
 685         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 686                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 687         xop->src_pt_cmd = xpt_cmd;
 688
 689         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 690                                 remote_port, true);
 691         if (rc < 0) {
 692                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 693                 transport_generic_free_cmd(se_cmd, 0);
 694                 return rc;
 695         }
 696
 697         xop->xop_data_sg = se_cmd->t_data_sg;
 698         xop->xop_data_nents = se_cmd->t_data_nents;
 699         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 700                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 701
 702         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 703         if (rc < 0) {
 704                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 705                 transport_generic_free_cmd(se_cmd, 0);
 706                 return rc;
 707         }
 708         /*
 709          * Clear off the allocated t_data_sg, that has been saved for
 710          * zero-copy WRITE submission reuse in struct xcopy_op..
 711          */
 712         se_cmd->t_data_sg = NULL;
 713         se_cmd->t_data_nents = 0;
 714
 715         return 0;
 716 }
 717
 718 static int target_xcopy_write_destination(
 719         struct se_cmd *ec_cmd,
 720         struct xcopy_op *xop,
 721         struct se_device *dst_dev,
 722         sector_t dst_lba,
 723         u32 dst_sectors)
 724 {
 725         struct xcopy_pt_cmd *xpt_cmd;
 726         struct se_cmd *se_cmd;
 727         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 728         int rc;
 729         unsigned char cdb[16];
 730         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 731
 732         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 733         if (!xpt_cmd) {
 734                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 735                 return -ENOMEM;
 736         }
 737         init_completion(&xpt_cmd->xpt_passthrough_sem);
 738         se_cmd = &xpt_cmd->se_cmd;
 739
 740         memset(&cdb[0], 0, 16);
 741         cdb[0] = WRITE_16;
 742         put_unaligned_be64(dst_lba, &cdb[2]);
 743         put_unaligned_be32(dst_sectors, &cdb[10]);
 744         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 745                 (unsigned long long)dst_lba, dst_sectors, length);
 746
 747         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 748                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 749         xop->dst_pt_cmd = xpt_cmd;
 750
 751         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 752                                 remote_port, false);
 753         if (rc < 0) {
 754                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 755                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 756                 /*
 757                  * If the failure happened before the t_mem_list hand-off in
 758                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 759                  * core releases this memory on error during X-COPY WRITE I/O.
 760                  */
 761                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 762                 src_cmd->t_data_sg = xop->xop_data_sg;
 763                 src_cmd->t_data_nents = xop->xop_data_nents;
 764
 765                 transport_generic_free_cmd(se_cmd, 0);
 766                 return rc;
 767         }
 768
 769         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 770         if (rc < 0) {
 771                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 772                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 773                 transport_generic_free_cmd(se_cmd, 0);
 774                 return rc;
 775         }
 776
 777         return 0;
 778 }
 779
 780 static void target_xcopy_do_work(struct work_struct *work)
 781 {
 782         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 783         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 784         struct se_device *src_dev, *dst_dev;
 785         sector_t src_lba, dst_lba, end_lba;
 786         unsigned int max_sectors;
 787         int rc = 0;
 788         unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
 789
 790         if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
 791                 goto err_free;
 792
 793         if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
 794                 goto err_free;
 795
 796         src_dev = xop->src_dev;
 797         dst_dev = xop->dst_dev;
 798         src_lba = xop->src_lba;
 799         dst_lba = xop->dst_lba;
 800         nolb = xop->nolb;
 801         end_lba = src_lba + nolb;
 802         /*
 803          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 804          * smallest max_sectors between src_dev + dev_dev, or
 805          */
 806         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 807                           dst_dev->dev_attrib.hw_max_sectors);
 808         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 809
 810         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 811
 812         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 813                         nolb, max_nolb, (unsigned long long)end_lba);
 814         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 815                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 816
 817         while (src_lba < end_lba) {
 818                 cur_nolb = min(nolb, max_nolb);
 819
 820                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 821                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 822
 823                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 824                 if (rc < 0)
 825                         goto out;
 826
 827                 src_lba += cur_nolb;
 828                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 829                                 (unsigned long long)src_lba);
 830
 831                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 832                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 833
 834                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 835                                                 dst_lba, cur_nolb);
 836                 if (rc < 0) {
 837                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 838                         goto out;
 839                 }
 840
 841                 dst_lba += cur_nolb;
 842                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 843                                 (unsigned long long)dst_lba);
 844
 845                 copied_nolb += cur_nolb;
 846                 nolb -= cur_nolb;
 847
 848                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 849                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 850
 851                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 852         }
 853
 854         xcopy_pt_undepend_remotedev(xop);
 855         kfree(xop);
 856
 857         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 858                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 859         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 860                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 861
 862         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 863         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 864         return;
 865
 866 out:
 867         xcopy_pt_undepend_remotedev(xop);
 868
 869 err_free:
 870         kfree(xop);
 871         /*
 872          * Don't override an error scsi status if it has already been set
 873          */
 874         if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
 875                 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
 876                         " CHECK_CONDITION -> sending response\n", rc);
 877                 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 878         }
 879         target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
 880 }
 881
 882 /*
 883  * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
 884  * fails.
 885  */
 886 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
 887 {
 888         struct se_cmd *se_cmd = xop->xop_se_cmd;
 889         unsigned char *p = NULL, *seg_desc;
 890         unsigned int list_id, list_id_usage, sdll, inline_dl;
 891         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 892         int rc;
 893         unsigned short tdll;
 894
 895         p = transport_kmap_data_sg(se_cmd);
 896         if (!p) {
 897                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 898                 return TCM_OUT_OF_RESOURCES;
 899         }
 900
 901         list_id = p[0];
 902         list_id_usage = (p[1] & 0x18) >> 3;
 903
 904         /*
 905          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 906          */
 907         tdll = get_unaligned_be16(&p[2]);
 908         sdll = get_unaligned_be32(&p[8]);
 909         if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
 910                 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
 911                        tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
 912                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 913                 goto out;
 914         }
 915
 916         inline_dl = get_unaligned_be32(&p[12]);
 917         if (inline_dl != 0) {
 918                 pr_err("XCOPY with non zero inline data length\n");
 919                 goto out;
 920         }
 921
 922         if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
 923                 pr_err("XCOPY parameter truncation: data length %u too small "
 924                         "for tdll: %hu sdll: %u inline_dl: %u\n",
 925                         se_cmd->data_length, tdll, sdll, inline_dl);
 926                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 927                 goto out;
 928         }
 929
 930         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 931                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 932                 tdll, sdll, inline_dl);
 933
 934         /*
 935          * skip over the target descriptors until segment descriptors
 936          * have been passed - CSCD ids are needed to determine src and dest.
 937          */
 938         seg_desc = &p[16] + tdll;
 939
 940         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
 941                                                     sdll, &ret);
 942         if (rc <= 0)
 943                 goto out;
 944
 945         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 946                                 rc * XCOPY_SEGMENT_DESC_LEN);
 947
 948         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
 949         if (rc <= 0)
 950                 goto out;
 951
 952         if (xop->src_dev->dev_attrib.block_size !=
 953             xop->dst_dev->dev_attrib.block_size) {
 954                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 955                        " block_size: %u currently unsupported\n",
 956                         xop->src_dev->dev_attrib.block_size,
 957                         xop->dst_dev->dev_attrib.block_size);
 958                 xcopy_pt_undepend_remotedev(xop);
 959                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 960                 goto out;
 961         }
 962
 963         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 964                                 rc * XCOPY_TARGET_DESC_LEN);
 965         transport_kunmap_data_sg(se_cmd);
 966         return TCM_NO_SENSE;
 967
 968 out:
 969         if (p)
 970                 transport_kunmap_data_sg(se_cmd);
 971         return ret;
 972 }
 973
 974 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 975 {
 976         struct se_device *dev = se_cmd->se_dev;
 977         struct xcopy_op *xop;
 978         unsigned int sa;
 979
 980         if (!dev->dev_attrib.emulate_3pc) {
 981                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 982                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 983         }
 984
 985         sa = se_cmd->t_task_cdb[1] & 0x1f;
 986         if (sa != 0x00) {
 987                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 988                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 989         }
 990
 991         if (se_cmd->data_length == 0) {
 992                 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
 993                 return TCM_NO_SENSE;
 994         }
 995         if (se_cmd->data_length < XCOPY_HDR_LEN) {
 996                 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
 997                                 se_cmd->data_length, XCOPY_HDR_LEN);
 998                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
 999         }
1000
1001         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1002         if (!xop)
1003                 goto err;
1004         xop->xop_se_cmd = se_cmd;
1005         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1006         if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1007                 goto free;
1008         return TCM_NO_SENSE;
1009
1010 free:
1011         kfree(xop);
1012
1013 err:
1014         return TCM_OUT_OF_RESOURCES;
1015 }
1016
1017 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1018 {
1019         unsigned char *p;
1020
1021         p = transport_kmap_data_sg(se_cmd);
1022         if (!p) {
1023                 pr_err("transport_kmap_data_sg failed in"
1024                        " target_rcr_operating_parameters\n");
1025                 return TCM_OUT_OF_RESOURCES;
1026         }
1027
1028         if (se_cmd->data_length < 54) {
1029                 pr_err("Receive Copy Results Op Parameters length"
1030                        " too small: %u\n", se_cmd->data_length);
1031                 transport_kunmap_data_sg(se_cmd);
1032                 return TCM_INVALID_CDB_FIELD;
1033         }
1034         /*
1035          * Set SNLID=1 (Supports no List ID)
1036          */
1037         p[4] = 0x1;
1038         /*
1039          * MAXIMUM TARGET DESCRIPTOR COUNT
1040          */
1041         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1042         /*
1043          * MAXIMUM SEGMENT DESCRIPTOR COUNT
1044          */
1045         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1046         /*
1047          * MAXIMUM DESCRIPTOR LIST LENGTH
1048          */
1049         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1050         /*
1051          * MAXIMUM SEGMENT LENGTH
1052          */
1053         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1054         /*
1055          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1056          */
1057         put_unaligned_be32(0x0, &p[20]);
1058         /*
1059          * HELD DATA LIMIT
1060          */
1061         put_unaligned_be32(0x0, &p[24]);
1062         /*
1063          * MAXIMUM STREAM DEVICE TRANSFER SIZE
1064          */
1065         put_unaligned_be32(0x0, &p[28]);
1066         /*
1067          * TOTAL CONCURRENT COPIES
1068          */
1069         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1070         /*
1071          * MAXIMUM CONCURRENT COPIES
1072          */
1073         p[36] = RCR_OP_MAX_CONCURR_COPIES;
1074         /*
1075          * DATA SEGMENT GRANULARITY (log 2)
1076          */
1077         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1078         /*
1079          * INLINE DATA GRANULARITY log 2)
1080          */
1081         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1082         /*
1083          * HELD DATA GRANULARITY
1084          */
1085         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1086         /*
1087          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1088          */
1089         p[43] = 0x2;
1090         /*
1091          * List of implemented descriptor type codes (ordered)
1092          */
1093         p[44] = 0x02; /* Copy Block to Block device */
1094         p[45] = 0xe4; /* Identification descriptor target descriptor */
1095
1096         /*
1097          * AVAILABLE DATA (n-3)
1098          */
1099         put_unaligned_be32(42, &p[0]);
1100
1101         transport_kunmap_data_sg(se_cmd);
1102         target_complete_cmd(se_cmd, GOOD);
1103
1104         return TCM_NO_SENSE;
1105 }
1106
1107 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1108 {
1109         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1110         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1111         sense_reason_t rc = TCM_NO_SENSE;
1112
1113         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1114                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1115
1116         if (list_id != 0) {
1117                 pr_err("Receive Copy Results with non zero list identifier"
1118                        " not supported\n");
1119                 return TCM_INVALID_CDB_FIELD;
1120         }
1121
1122         switch (sa) {
1123         case RCR_SA_OPERATING_PARAMETERS:
1124                 rc = target_rcr_operating_parameters(se_cmd);
1125                 break;
1126         case RCR_SA_COPY_STATUS:
1127         case RCR_SA_RECEIVE_DATA:
1128         case RCR_SA_FAILED_SEGMENT_DETAILS:
1129         default:
1130                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1131                 return TCM_INVALID_CDB_FIELD;
1132         }
1133
1134         return rc;
1135 }