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_write_pending_status(struct se_cmd *se_cmd)
 446 {
 447         return 0;
 448 }
 449
 450 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 451 {
 452         return 0;
 453 }
 454
 455 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 456 {
 457         return 0;
 458 }
 459
 460 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 461         .fabric_name            = "xcopy-pt",
 462         .get_cmd_state          = xcopy_pt_get_cmd_state,
 463         .release_cmd            = xcopy_pt_release_cmd,
 464         .check_stop_free        = xcopy_pt_check_stop_free,
 465         .write_pending          = xcopy_pt_write_pending,
 466         .write_pending_status   = xcopy_pt_write_pending_status,
 467         .queue_data_in          = xcopy_pt_queue_data_in,
 468         .queue_status           = xcopy_pt_queue_status,
 469 };
 470
 471 /*
 472  * End xcopy_pt_ops
 473  */
 474
 475 int target_xcopy_setup_pt(void)
 476 {
 477         int ret;
 478
 479         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 480         if (!xcopy_wq) {
 481                 pr_err("Unable to allocate xcopy_wq\n");
 482                 return -ENOMEM;
 483         }
 484
 485         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 486         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 487         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 488         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 489
 490         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 491
 492         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 493         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 494         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 495         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 496         ret = transport_init_session(&xcopy_pt_sess);
 497         if (ret < 0)
 498                 return ret;
 499
 500         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 501         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 502
 503         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 504         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 505
 506         return 0;
 507 }
 508
 509 void target_xcopy_release_pt(void)
 510 {
 511         if (xcopy_wq)
 512                 destroy_workqueue(xcopy_wq);
 513 }
 514
 515 static void target_xcopy_setup_pt_port(
 516         struct xcopy_pt_cmd *xpt_cmd,
 517         struct xcopy_op *xop,
 518         bool remote_port)
 519 {
 520         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 521         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 522
 523         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 524                 /*
 525                  * Honor destination port reservations for X-COPY PUSH emulation
 526                  * when CDB is received on local source port, and READs blocks to
 527                  * WRITE on remote destination port.
 528                  */
 529                 if (remote_port) {
 530                         xpt_cmd->remote_port = remote_port;
 531                 } else {
 532                         pt_cmd->se_lun = ec_cmd->se_lun;
 533                         pt_cmd->se_dev = ec_cmd->se_dev;
 534
 535                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 536                                 " %p\n", pt_cmd->se_dev);
 537                         pt_cmd->se_lun = ec_cmd->se_lun;
 538                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 539                                 pt_cmd->se_lun);
 540                 }
 541         } else {
 542                 /*
 543                  * Honor source port reservation for X-COPY PULL emulation
 544                  * when CDB is received on local desintation port, and READs
 545                  * blocks from the remote source port to WRITE on local
 546                  * destination port.
 547                  */
 548                 if (remote_port) {
 549                         xpt_cmd->remote_port = remote_port;
 550                 } else {
 551                         pt_cmd->se_lun = ec_cmd->se_lun;
 552                         pt_cmd->se_dev = ec_cmd->se_dev;
 553
 554                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 555                                 " %p\n", pt_cmd->se_dev);
 556                         pt_cmd->se_lun = ec_cmd->se_lun;
 557                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 558                                 pt_cmd->se_lun);
 559                 }
 560         }
 561 }
 562
 563 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 564                 struct se_cmd *pt_cmd, bool remote_port)
 565 {
 566         /*
 567          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 568          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 569          * target_xcopy_setup_pt_port()
 570          */
 571         if (remote_port) {
 572                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 573                         pt_cmd->se_dev);
 574                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 575                 pt_cmd->se_dev = se_dev;
 576         }
 577
 578         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 579 }
 580
 581 static int target_xcopy_setup_pt_cmd(
 582         struct xcopy_pt_cmd *xpt_cmd,
 583         struct xcopy_op *xop,
 584         struct se_device *se_dev,
 585         unsigned char *cdb,
 586         bool remote_port,
 587         bool alloc_mem)
 588 {
 589         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 590         sense_reason_t sense_rc;
 591         int ret = 0, rc;
 592         /*
 593          * Setup LUN+port to honor reservations based upon xop->op_origin for
 594          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 595          */
 596         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 597         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 598
 599         cmd->tag = 0;
 600         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 601         if (sense_rc) {
 602                 ret = -EINVAL;
 603                 goto out;
 604         }
 605
 606         if (alloc_mem) {
 607                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 608                                       cmd->data_length, false, false);
 609                 if (rc < 0) {
 610                         ret = rc;
 611                         goto out;
 612                 }
 613                 /*
 614                  * Set this bit so that transport_free_pages() allows the
 615                  * caller to release SGLs + physical memory allocated by
 616                  * transport_generic_get_mem()..
 617                  */
 618                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 619         } else {
 620                 /*
 621                  * Here the previously allocated SGLs for the internal READ
 622                  * are mapped zero-copy to the internal WRITE.
 623                  */
 624                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 625                                         xop->xop_data_sg, xop->xop_data_nents,
 626                                         NULL, 0);
 627                 if (sense_rc) {
 628                         ret = -EINVAL;
 629                         goto out;
 630                 }
 631
 632                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 633                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 634         }
 635
 636         return 0;
 637
 638 out:
 639         return ret;
 640 }
 641
 642 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 643 {
 644         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 645         sense_reason_t sense_rc;
 646
 647         sense_rc = transport_generic_new_cmd(se_cmd);
 648         if (sense_rc)
 649                 return -EINVAL;
 650
 651         if (se_cmd->data_direction == DMA_TO_DEVICE)
 652                 target_execute_cmd(se_cmd);
 653
 654         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 655
 656         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 657                         se_cmd->scsi_status);
 658
 659         return (se_cmd->scsi_status) ? -EINVAL : 0;
 660 }
 661
 662 static int target_xcopy_read_source(
 663         struct se_cmd *ec_cmd,
 664         struct xcopy_op *xop,
 665         struct se_device *src_dev,
 666         sector_t src_lba,
 667         u32 src_sectors)
 668 {
 669         struct xcopy_pt_cmd *xpt_cmd;
 670         struct se_cmd *se_cmd;
 671         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 672         int rc;
 673         unsigned char cdb[16];
 674         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 675
 676         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 677         if (!xpt_cmd) {
 678                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 679                 return -ENOMEM;
 680         }
 681         init_completion(&xpt_cmd->xpt_passthrough_sem);
 682         se_cmd = &xpt_cmd->se_cmd;
 683
 684         memset(&cdb[0], 0, 16);
 685         cdb[0] = READ_16;
 686         put_unaligned_be64(src_lba, &cdb[2]);
 687         put_unaligned_be32(src_sectors, &cdb[10]);
 688         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 689                 (unsigned long long)src_lba, src_sectors, length);
 690
 691         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 692                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 693         xop->src_pt_cmd = xpt_cmd;
 694
 695         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 696                                 remote_port, true);
 697         if (rc < 0) {
 698                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 699                 transport_generic_free_cmd(se_cmd, 0);
 700                 return rc;
 701         }
 702
 703         xop->xop_data_sg = se_cmd->t_data_sg;
 704         xop->xop_data_nents = se_cmd->t_data_nents;
 705         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 706                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 707
 708         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 709         if (rc < 0) {
 710                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 711                 transport_generic_free_cmd(se_cmd, 0);
 712                 return rc;
 713         }
 714         /*
 715          * Clear off the allocated t_data_sg, that has been saved for
 716          * zero-copy WRITE submission reuse in struct xcopy_op..
 717          */
 718         se_cmd->t_data_sg = NULL;
 719         se_cmd->t_data_nents = 0;
 720
 721         return 0;
 722 }
 723
 724 static int target_xcopy_write_destination(
 725         struct se_cmd *ec_cmd,
 726         struct xcopy_op *xop,
 727         struct se_device *dst_dev,
 728         sector_t dst_lba,
 729         u32 dst_sectors)
 730 {
 731         struct xcopy_pt_cmd *xpt_cmd;
 732         struct se_cmd *se_cmd;
 733         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 734         int rc;
 735         unsigned char cdb[16];
 736         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 737
 738         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 739         if (!xpt_cmd) {
 740                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 741                 return -ENOMEM;
 742         }
 743         init_completion(&xpt_cmd->xpt_passthrough_sem);
 744         se_cmd = &xpt_cmd->se_cmd;
 745
 746         memset(&cdb[0], 0, 16);
 747         cdb[0] = WRITE_16;
 748         put_unaligned_be64(dst_lba, &cdb[2]);
 749         put_unaligned_be32(dst_sectors, &cdb[10]);
 750         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 751                 (unsigned long long)dst_lba, dst_sectors, length);
 752
 753         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 754                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 755         xop->dst_pt_cmd = xpt_cmd;
 756
 757         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 758                                 remote_port, false);
 759         if (rc < 0) {
 760                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 761                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 762                 /*
 763                  * If the failure happened before the t_mem_list hand-off in
 764                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 765                  * core releases this memory on error during X-COPY WRITE I/O.
 766                  */
 767                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 768                 src_cmd->t_data_sg = xop->xop_data_sg;
 769                 src_cmd->t_data_nents = xop->xop_data_nents;
 770
 771                 transport_generic_free_cmd(se_cmd, 0);
 772                 return rc;
 773         }
 774
 775         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 776         if (rc < 0) {
 777                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 778                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 779                 transport_generic_free_cmd(se_cmd, 0);
 780                 return rc;
 781         }
 782
 783         return 0;
 784 }
 785
 786 static void target_xcopy_do_work(struct work_struct *work)
 787 {
 788         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 789         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 790         struct se_device *src_dev, *dst_dev;
 791         sector_t src_lba, dst_lba, end_lba;
 792         unsigned int max_sectors;
 793         int rc = 0;
 794         unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
 795
 796         if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
 797                 goto err_free;
 798
 799         if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
 800                 goto err_free;
 801
 802         src_dev = xop->src_dev;
 803         dst_dev = xop->dst_dev;
 804         src_lba = xop->src_lba;
 805         dst_lba = xop->dst_lba;
 806         nolb = xop->nolb;
 807         end_lba = src_lba + nolb;
 808         /*
 809          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 810          * smallest max_sectors between src_dev + dev_dev, or
 811          */
 812         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 813                           dst_dev->dev_attrib.hw_max_sectors);
 814         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 815
 816         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 817
 818         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 819                         nolb, max_nolb, (unsigned long long)end_lba);
 820         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 821                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 822
 823         while (src_lba < end_lba) {
 824                 cur_nolb = min(nolb, max_nolb);
 825
 826                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 827                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 828
 829                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 830                 if (rc < 0)
 831                         goto out;
 832
 833                 src_lba += cur_nolb;
 834                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 835                                 (unsigned long long)src_lba);
 836
 837                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 838                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 839
 840                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 841                                                 dst_lba, cur_nolb);
 842                 if (rc < 0) {
 843                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 844                         goto out;
 845                 }
 846
 847                 dst_lba += cur_nolb;
 848                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 849                                 (unsigned long long)dst_lba);
 850
 851                 copied_nolb += cur_nolb;
 852                 nolb -= cur_nolb;
 853
 854                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 855                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 856
 857                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 858         }
 859
 860         xcopy_pt_undepend_remotedev(xop);
 861         kfree(xop);
 862
 863         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 864                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 865         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 866                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 867
 868         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 869         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 870         return;
 871
 872 out:
 873         xcopy_pt_undepend_remotedev(xop);
 874
 875 err_free:
 876         kfree(xop);
 877         /*
 878          * Don't override an error scsi status if it has already been set
 879          */
 880         if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
 881                 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
 882                         " CHECK_CONDITION -> sending response\n", rc);
 883                 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 884         }
 885         target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
 886 }
 887
 888 /*
 889  * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
 890  * fails.
 891  */
 892 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
 893 {
 894         struct se_cmd *se_cmd = xop->xop_se_cmd;
 895         unsigned char *p = NULL, *seg_desc;
 896         unsigned int list_id, list_id_usage, sdll, inline_dl;
 897         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 898         int rc;
 899         unsigned short tdll;
 900
 901         p = transport_kmap_data_sg(se_cmd);
 902         if (!p) {
 903                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 904                 return TCM_OUT_OF_RESOURCES;
 905         }
 906
 907         list_id = p[0];
 908         list_id_usage = (p[1] & 0x18) >> 3;
 909
 910         /*
 911          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 912          */
 913         tdll = get_unaligned_be16(&p[2]);
 914         sdll = get_unaligned_be32(&p[8]);
 915         if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
 916                 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
 917                        tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
 918                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 919                 goto out;
 920         }
 921
 922         inline_dl = get_unaligned_be32(&p[12]);
 923         if (inline_dl != 0) {
 924                 pr_err("XCOPY with non zero inline data length\n");
 925                 goto out;
 926         }
 927
 928         if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
 929                 pr_err("XCOPY parameter truncation: data length %u too small "
 930                         "for tdll: %hu sdll: %u inline_dl: %u\n",
 931                         se_cmd->data_length, tdll, sdll, inline_dl);
 932                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 933                 goto out;
 934         }
 935
 936         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 937                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 938                 tdll, sdll, inline_dl);
 939
 940         /*
 941          * skip over the target descriptors until segment descriptors
 942          * have been passed - CSCD ids are needed to determine src and dest.
 943          */
 944         seg_desc = &p[16] + tdll;
 945
 946         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
 947                                                     sdll, &ret);
 948         if (rc <= 0)
 949                 goto out;
 950
 951         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 952                                 rc * XCOPY_SEGMENT_DESC_LEN);
 953
 954         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
 955         if (rc <= 0)
 956                 goto out;
 957
 958         if (xop->src_dev->dev_attrib.block_size !=
 959             xop->dst_dev->dev_attrib.block_size) {
 960                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 961                        " block_size: %u currently unsupported\n",
 962                         xop->src_dev->dev_attrib.block_size,
 963                         xop->dst_dev->dev_attrib.block_size);
 964                 xcopy_pt_undepend_remotedev(xop);
 965                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 966                 goto out;
 967         }
 968
 969         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 970                                 rc * XCOPY_TARGET_DESC_LEN);
 971         transport_kunmap_data_sg(se_cmd);
 972         return TCM_NO_SENSE;
 973
 974 out:
 975         if (p)
 976                 transport_kunmap_data_sg(se_cmd);
 977         return ret;
 978 }
 979
 980 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 981 {
 982         struct se_device *dev = se_cmd->se_dev;
 983         struct xcopy_op *xop;
 984         unsigned int sa;
 985
 986         if (!dev->dev_attrib.emulate_3pc) {
 987                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 988                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 989         }
 990
 991         sa = se_cmd->t_task_cdb[1] & 0x1f;
 992         if (sa != 0x00) {
 993                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 994                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 995         }
 996
 997         if (se_cmd->data_length == 0) {
 998                 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
 999                 return TCM_NO_SENSE;
1000         }
1001         if (se_cmd->data_length < XCOPY_HDR_LEN) {
1002                 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
1003                                 se_cmd->data_length, XCOPY_HDR_LEN);
1004                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1005         }
1006
1007         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1008         if (!xop)
1009                 goto err;
1010         xop->xop_se_cmd = se_cmd;
1011         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1012         if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1013                 goto free;
1014         return TCM_NO_SENSE;
1015
1016 free:
1017         kfree(xop);
1018
1019 err:
1020         return TCM_OUT_OF_RESOURCES;
1021 }
1022
1023 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1024 {
1025         unsigned char *p;
1026
1027         p = transport_kmap_data_sg(se_cmd);
1028         if (!p) {
1029                 pr_err("transport_kmap_data_sg failed in"
1030                        " target_rcr_operating_parameters\n");
1031                 return TCM_OUT_OF_RESOURCES;
1032         }
1033
1034         if (se_cmd->data_length < 54) {
1035                 pr_err("Receive Copy Results Op Parameters length"
1036                        " too small: %u\n", se_cmd->data_length);
1037                 transport_kunmap_data_sg(se_cmd);
1038                 return TCM_INVALID_CDB_FIELD;
1039         }
1040         /*
1041          * Set SNLID=1 (Supports no List ID)
1042          */
1043         p[4] = 0x1;
1044         /*
1045          * MAXIMUM TARGET DESCRIPTOR COUNT
1046          */
1047         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1048         /*
1049          * MAXIMUM SEGMENT DESCRIPTOR COUNT
1050          */
1051         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1052         /*
1053          * MAXIMUM DESCRIPTOR LIST LENGTH
1054          */
1055         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1056         /*
1057          * MAXIMUM SEGMENT LENGTH
1058          */
1059         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1060         /*
1061          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1062          */
1063         put_unaligned_be32(0x0, &p[20]);
1064         /*
1065          * HELD DATA LIMIT
1066          */
1067         put_unaligned_be32(0x0, &p[24]);
1068         /*
1069          * MAXIMUM STREAM DEVICE TRANSFER SIZE
1070          */
1071         put_unaligned_be32(0x0, &p[28]);
1072         /*
1073          * TOTAL CONCURRENT COPIES
1074          */
1075         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1076         /*
1077          * MAXIMUM CONCURRENT COPIES
1078          */
1079         p[36] = RCR_OP_MAX_CONCURR_COPIES;
1080         /*
1081          * DATA SEGMENT GRANULARITY (log 2)
1082          */
1083         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1084         /*
1085          * INLINE DATA GRANULARITY log 2)
1086          */
1087         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1088         /*
1089          * HELD DATA GRANULARITY
1090          */
1091         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1092         /*
1093          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1094          */
1095         p[43] = 0x2;
1096         /*
1097          * List of implemented descriptor type codes (ordered)
1098          */
1099         p[44] = 0x02; /* Copy Block to Block device */
1100         p[45] = 0xe4; /* Identification descriptor target descriptor */
1101
1102         /*
1103          * AVAILABLE DATA (n-3)
1104          */
1105         put_unaligned_be32(42, &p[0]);
1106
1107         transport_kunmap_data_sg(se_cmd);
1108         target_complete_cmd(se_cmd, GOOD);
1109
1110         return TCM_NO_SENSE;
1111 }
1112
1113 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1114 {
1115         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1116         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1117         sense_reason_t rc = TCM_NO_SENSE;
1118
1119         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1120                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1121
1122         if (list_id != 0) {
1123                 pr_err("Receive Copy Results with non zero list identifier"
1124                        " not supported\n");
1125                 return TCM_INVALID_CDB_FIELD;
1126         }
1127
1128         switch (sa) {
1129         case RCR_SA_OPERATING_PARAMETERS:
1130                 rc = target_rcr_operating_parameters(se_cmd);
1131                 break;
1132         case RCR_SA_COPY_STATUS:
1133         case RCR_SA_RECEIVE_DATA:
1134         case RCR_SA_FAILED_SEGMENT_DETAILS:
1135         default:
1136                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1137                 return TCM_INVALID_CDB_FIELD;
1138         }
1139
1140         return rc;
1141 }