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 int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
  44 {
  45         int off = 0;
  46
  47         buf[off++] = (0x6 << 4);
  48         buf[off++] = 0x01;
  49         buf[off++] = 0x40;
  50         buf[off] = (0x5 << 4);
  51
  52         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
  53         return 0;
  54 }
  55
  56 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
  57                                         struct se_device **found_dev)
  58 {
  59         struct se_device *se_dev;
  60         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
  61         int rc;
  62
  63         mutex_lock(&g_device_mutex);
  64         list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
  65
  66                 if (!se_dev->dev_attrib.emulate_3pc)
  67                         continue;
  68
  69                 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
  70                 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
  71
  72                 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  73                 if (rc != 0)
  74                         continue;
  75
  76                 *found_dev = se_dev;
  77                 pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
  78
  79                 rc = target_depend_item(&se_dev->dev_group.cg_item);
  80                 if (rc != 0) {
  81                         pr_err("configfs_depend_item attempt failed:"
  82                                 " %d for se_dev: %p\n", rc, se_dev);
  83                         mutex_unlock(&g_device_mutex);
  84                         return rc;
  85                 }
  86
  87                 pr_debug("Called configfs_depend_item for se_dev: %p"
  88                         " se_dev->se_dev_group: %p\n", se_dev,
  89                         &se_dev->dev_group);
  90
  91                 mutex_unlock(&g_device_mutex);
  92                 return 0;
  93         }
  94         mutex_unlock(&g_device_mutex);
  95
  96         pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
  97         return -EINVAL;
  98 }
  99
 100 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 101                                 unsigned char *p, unsigned short cscd_index)
 102 {
 103         unsigned char *desc = p;
 104         unsigned short ript;
 105         u8 desig_len;
 106         /*
 107          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 108          */
 109         ript = get_unaligned_be16(&desc[2]);
 110         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 111         /*
 112          * Check for supported code set, association, and designator type
 113          */
 114         if ((desc[4] & 0x0f) != 0x1) {
 115                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 116                 return -EINVAL;
 117         }
 118         if ((desc[5] & 0x30) != 0x00) {
 119                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 120                 return -EINVAL;
 121         }
 122         if ((desc[5] & 0x0f) != 0x3) {
 123                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 124                                 (desc[5] & 0x0f));
 125                 return -EINVAL;
 126         }
 127         /*
 128          * Check for matching 16 byte length for NAA IEEE Registered Extended
 129          * Assigned designator
 130          */
 131         desig_len = desc[7];
 132         if (desig_len != 16) {
 133                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 134                 return -EINVAL;
 135         }
 136         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 137         /*
 138          * Check for NAA IEEE Registered Extended Assigned header..
 139          */
 140         if ((desc[8] & 0xf0) != 0x60) {
 141                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 142                                         (desc[8] & 0xf0));
 143                 return -EINVAL;
 144         }
 145
 146         if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
 147                 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
 148                          "dest\n", cscd_index);
 149                 return 0;
 150         }
 151
 152         if (cscd_index == xop->stdi) {
 153                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 154                 /*
 155                  * Determine if the source designator matches the local device
 156                  */
 157                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 158                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 159                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 160                         xop->src_dev = se_cmd->se_dev;
 161                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 162                                         " received xop\n", xop->src_dev);
 163                 }
 164         }
 165
 166         if (cscd_index == xop->dtdi) {
 167                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 168                 /*
 169                  * Determine if the destination designator matches the local
 170                  * device. If @cscd_index corresponds to both source (stdi) and
 171                  * destination (dtdi), or dtdi comes after stdi, then
 172                  * XCOL_DEST_RECV_OP wins.
 173                  */
 174                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 175                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 176                         xop->op_origin = XCOL_DEST_RECV_OP;
 177                         xop->dst_dev = se_cmd->se_dev;
 178                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 179                                 " received xop\n", xop->dst_dev);
 180                 }
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 187                                 struct xcopy_op *xop, unsigned char *p,
 188                                 unsigned short tdll, sense_reason_t *sense_ret)
 189 {
 190         struct se_device *local_dev = se_cmd->se_dev;
 191         unsigned char *desc = p;
 192         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
 193         unsigned short cscd_index = 0;
 194         unsigned short start = 0;
 195
 196         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 197
 198         if (offset != 0) {
 199                 pr_err("XCOPY target descriptor list length is not"
 200                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 201                 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 202                 return -EINVAL;
 203         }
 204         if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
 205                 pr_err("XCOPY target descriptor supports a maximum"
 206                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 207                 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
 208                 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
 209                 return -EINVAL;
 210         }
 211         /*
 212          * Generate an IEEE Registered Extended designator based upon the
 213          * se_device the XCOPY was received upon..
 214          */
 215         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 216         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 217
 218         while (start < tdll) {
 219                 /*
 220                  * Check target descriptor identification with 0xE4 type, and
 221                  * compare the current index with the CSCD descriptor IDs in
 222                  * the segment descriptor. Use VPD 0x83 WWPN matching ..
 223                  */
 224                 switch (desc[0]) {
 225                 case 0xe4:
 226                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 227                                                         &desc[0], cscd_index);
 228                         if (rc != 0)
 229                                 goto out;
 230                         start += XCOPY_TARGET_DESC_LEN;
 231                         desc += XCOPY_TARGET_DESC_LEN;
 232                         cscd_index++;
 233                         break;
 234                 default:
 235                         pr_err("XCOPY unsupported descriptor type code:"
 236                                         " 0x%02x\n", desc[0]);
 237                         *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 238                         goto out;
 239                 }
 240         }
 241
 242         switch (xop->op_origin) {
 243         case XCOL_SOURCE_RECV_OP:
 244                 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
 245                                                 &xop->dst_dev);
 246                 break;
 247         case XCOL_DEST_RECV_OP:
 248                 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
 249                                                 &xop->src_dev);
 250                 break;
 251         default:
 252                 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
 253                         "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
 254                 rc = -EINVAL;
 255                 break;
 256         }
 257         /*
 258          * If a matching IEEE NAA 0x83 descriptor for the requested device
 259          * is not located on this node, return COPY_ABORTED with ASQ/ASQC
 260          * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
 261          * initiator to fall back to normal copy method.
 262          */
 263         if (rc < 0) {
 264                 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
 265                 goto out;
 266         }
 267
 268         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 269                  xop->src_dev, &xop->src_tid_wwn[0]);
 270         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 271                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 272
 273         return cscd_index;
 274
 275 out:
 276         return -EINVAL;
 277 }
 278
 279 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 280                                         unsigned char *p)
 281 {
 282         unsigned char *desc = p;
 283         int dc = (desc[1] & 0x02);
 284         unsigned short desc_len;
 285
 286         desc_len = get_unaligned_be16(&desc[2]);
 287         if (desc_len != 0x18) {
 288                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 289                                 " %hu\n", desc_len);
 290                 return -EINVAL;
 291         }
 292
 293         xop->stdi = get_unaligned_be16(&desc[4]);
 294         xop->dtdi = get_unaligned_be16(&desc[6]);
 295
 296         if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
 297             xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
 298                 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
 299                         XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
 300                 return -EINVAL;
 301         }
 302
 303         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 304                 desc_len, xop->stdi, xop->dtdi, dc);
 305
 306         xop->nolb = get_unaligned_be16(&desc[10]);
 307         xop->src_lba = get_unaligned_be64(&desc[12]);
 308         xop->dst_lba = get_unaligned_be64(&desc[20]);
 309         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 310                 xop->nolb, (unsigned long long)xop->src_lba,
 311                 (unsigned long long)xop->dst_lba);
 312
 313         if (dc != 0) {
 314                 xop->dbl = (desc[29] & 0xff) << 16;
 315                 xop->dbl |= (desc[30] & 0xff) << 8;
 316                 xop->dbl |= desc[31] & 0xff;
 317
 318                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 319         }
 320         return 0;
 321 }
 322
 323 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 324                                 struct xcopy_op *xop, unsigned char *p,
 325                                 unsigned int sdll, sense_reason_t *sense_ret)
 326 {
 327         unsigned char *desc = p;
 328         unsigned int start = 0;
 329         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 330
 331         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 332
 333         if (offset != 0) {
 334                 pr_err("XCOPY segment descriptor list length is not"
 335                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 336                 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 337                 return -EINVAL;
 338         }
 339         if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
 340                 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
 341                         " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
 342                 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
 343                 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
 344                 return -EINVAL;
 345         }
 346
 347         while (start < sdll) {
 348                 /*
 349                  * Check segment descriptor type code for block -> block
 350                  */
 351                 switch (desc[0]) {
 352                 case 0x02:
 353                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 354                         if (rc < 0)
 355                                 goto out;
 356
 357                         ret++;
 358                         start += XCOPY_SEGMENT_DESC_LEN;
 359                         desc += XCOPY_SEGMENT_DESC_LEN;
 360                         break;
 361                 default:
 362                         pr_err("XCOPY unsupported segment descriptor"
 363                                 "type: 0x%02x\n", desc[0]);
 364                         *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 365                         goto out;
 366                 }
 367         }
 368
 369         return ret;
 370
 371 out:
 372         return -EINVAL;
 373 }
 374
 375 /*
 376  * Start xcopy_pt ops
 377  */
 378
 379 struct xcopy_pt_cmd {
 380         bool remote_port;
 381         struct se_cmd se_cmd;
 382         struct xcopy_op *xcopy_op;
 383         struct completion xpt_passthrough_sem;
 384         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 385 };
 386
 387 struct se_portal_group xcopy_pt_tpg;
 388 static struct se_session xcopy_pt_sess;
 389 static struct se_node_acl xcopy_pt_nacl;
 390
 391 static char *xcopy_pt_get_fabric_name(void)
 392 {
 393         return "xcopy-pt";
 394 }
 395
 396 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 397 {
 398         return 0;
 399 }
 400
 401 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 402 {
 403         struct se_device *remote_dev;
 404
 405         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 406                 remote_dev = xop->dst_dev;
 407         else
 408                 remote_dev = xop->src_dev;
 409
 410         pr_debug("Calling configfs_undepend_item for"
 411                   " remote_dev: %p remote_dev->dev_group: %p\n",
 412                   remote_dev, &remote_dev->dev_group.cg_item);
 413
 414         target_undepend_item(&remote_dev->dev_group.cg_item);
 415 }
 416
 417 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 418 {
 419         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 420                                 struct xcopy_pt_cmd, se_cmd);
 421
 422         kfree(xpt_cmd);
 423 }
 424
 425 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 426 {
 427         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 428                                 struct xcopy_pt_cmd, se_cmd);
 429
 430         complete(&xpt_cmd->xpt_passthrough_sem);
 431         return 0;
 432 }
 433
 434 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 435 {
 436         return 0;
 437 }
 438
 439 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 440 {
 441         return 0;
 442 }
 443
 444 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 445 {
 446         return 0;
 447 }
 448
 449 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 450 {
 451         return 0;
 452 }
 453
 454 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 455         .get_fabric_name        = xcopy_pt_get_fabric_name,
 456         .get_cmd_state          = xcopy_pt_get_cmd_state,
 457         .release_cmd            = xcopy_pt_release_cmd,
 458         .check_stop_free        = xcopy_pt_check_stop_free,
 459         .write_pending          = xcopy_pt_write_pending,
 460         .write_pending_status   = xcopy_pt_write_pending_status,
 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         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 472         if (!xcopy_wq) {
 473                 pr_err("Unable to allocate xcopy_wq\n");
 474                 return -ENOMEM;
 475         }
 476
 477         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 478         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 479         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 480         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 481
 482         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 483
 484         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 485         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 486         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 487         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 488         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 489         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 490         INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
 491         spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
 492
 493         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 494         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 495
 496         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 497         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 498
 499         return 0;
 500 }
 501
 502 void target_xcopy_release_pt(void)
 503 {
 504         if (xcopy_wq)
 505                 destroy_workqueue(xcopy_wq);
 506 }
 507
 508 static void target_xcopy_setup_pt_port(
 509         struct xcopy_pt_cmd *xpt_cmd,
 510         struct xcopy_op *xop,
 511         bool remote_port)
 512 {
 513         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 514         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 515
 516         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 517                 /*
 518                  * Honor destination port reservations for X-COPY PUSH emulation
 519                  * when CDB is received on local source port, and READs blocks to
 520                  * WRITE on remote destination port.
 521                  */
 522                 if (remote_port) {
 523                         xpt_cmd->remote_port = remote_port;
 524                 } else {
 525                         pt_cmd->se_lun = ec_cmd->se_lun;
 526                         pt_cmd->se_dev = ec_cmd->se_dev;
 527
 528                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 529                                 " %p\n", pt_cmd->se_dev);
 530                         pt_cmd->se_lun = ec_cmd->se_lun;
 531                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 532                                 pt_cmd->se_lun);
 533                 }
 534         } else {
 535                 /*
 536                  * Honor source port reservation for X-COPY PULL emulation
 537                  * when CDB is received on local desintation port, and READs
 538                  * blocks from the remote source port to WRITE on local
 539                  * destination port.
 540                  */
 541                 if (remote_port) {
 542                         xpt_cmd->remote_port = remote_port;
 543                 } else {
 544                         pt_cmd->se_lun = ec_cmd->se_lun;
 545                         pt_cmd->se_dev = ec_cmd->se_dev;
 546
 547                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 548                                 " %p\n", pt_cmd->se_dev);
 549                         pt_cmd->se_lun = ec_cmd->se_lun;
 550                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 551                                 pt_cmd->se_lun);
 552                 }
 553         }
 554 }
 555
 556 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 557                 struct se_cmd *pt_cmd, bool remote_port)
 558 {
 559         /*
 560          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 561          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 562          * target_xcopy_setup_pt_port()
 563          */
 564         if (remote_port) {
 565                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 566                         pt_cmd->se_dev);
 567                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 568                 pt_cmd->se_dev = se_dev;
 569         }
 570
 571         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 572 }
 573
 574 static int target_xcopy_setup_pt_cmd(
 575         struct xcopy_pt_cmd *xpt_cmd,
 576         struct xcopy_op *xop,
 577         struct se_device *se_dev,
 578         unsigned char *cdb,
 579         bool remote_port,
 580         bool alloc_mem)
 581 {
 582         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 583         sense_reason_t sense_rc;
 584         int ret = 0, rc;
 585         /*
 586          * Setup LUN+port to honor reservations based upon xop->op_origin for
 587          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 588          */
 589         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 590
 591         xpt_cmd->xcopy_op = xop;
 592         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 593
 594         cmd->tag = 0;
 595         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 596         if (sense_rc) {
 597                 ret = -EINVAL;
 598                 goto out;
 599         }
 600
 601         if (alloc_mem) {
 602                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 603                                       cmd->data_length, false, false);
 604                 if (rc < 0) {
 605                         ret = rc;
 606                         goto out;
 607                 }
 608                 /*
 609                  * Set this bit so that transport_free_pages() allows the
 610                  * caller to release SGLs + physical memory allocated by
 611                  * transport_generic_get_mem()..
 612                  */
 613                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 614         } else {
 615                 /*
 616                  * Here the previously allocated SGLs for the internal READ
 617                  * are mapped zero-copy to the internal WRITE.
 618                  */
 619                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 620                                         xop->xop_data_sg, xop->xop_data_nents,
 621                                         NULL, 0);
 622                 if (sense_rc) {
 623                         ret = -EINVAL;
 624                         goto out;
 625                 }
 626
 627                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 628                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 629         }
 630
 631         return 0;
 632
 633 out:
 634         return ret;
 635 }
 636
 637 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 638 {
 639         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 640         sense_reason_t sense_rc;
 641
 642         sense_rc = transport_generic_new_cmd(se_cmd);
 643         if (sense_rc)
 644                 return -EINVAL;
 645
 646         if (se_cmd->data_direction == DMA_TO_DEVICE)
 647                 target_execute_cmd(se_cmd);
 648
 649         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 650
 651         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 652                         se_cmd->scsi_status);
 653
 654         return (se_cmd->scsi_status) ? -EINVAL : 0;
 655 }
 656
 657 static int target_xcopy_read_source(
 658         struct se_cmd *ec_cmd,
 659         struct xcopy_op *xop,
 660         struct se_device *src_dev,
 661         sector_t src_lba,
 662         u32 src_sectors)
 663 {
 664         struct xcopy_pt_cmd *xpt_cmd;
 665         struct se_cmd *se_cmd;
 666         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 667         int rc;
 668         unsigned char cdb[16];
 669         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 670
 671         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 672         if (!xpt_cmd) {
 673                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 674                 return -ENOMEM;
 675         }
 676         init_completion(&xpt_cmd->xpt_passthrough_sem);
 677         se_cmd = &xpt_cmd->se_cmd;
 678
 679         memset(&cdb[0], 0, 16);
 680         cdb[0] = READ_16;
 681         put_unaligned_be64(src_lba, &cdb[2]);
 682         put_unaligned_be32(src_sectors, &cdb[10]);
 683         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 684                 (unsigned long long)src_lba, src_sectors, length);
 685
 686         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 687                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 688         xop->src_pt_cmd = xpt_cmd;
 689
 690         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 691                                 remote_port, true);
 692         if (rc < 0) {
 693                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 694                 transport_generic_free_cmd(se_cmd, 0);
 695                 return rc;
 696         }
 697
 698         xop->xop_data_sg = se_cmd->t_data_sg;
 699         xop->xop_data_nents = se_cmd->t_data_nents;
 700         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 701                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 702
 703         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 704         if (rc < 0) {
 705                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 706                 transport_generic_free_cmd(se_cmd, 0);
 707                 return rc;
 708         }
 709         /*
 710          * Clear off the allocated t_data_sg, that has been saved for
 711          * zero-copy WRITE submission reuse in struct xcopy_op..
 712          */
 713         se_cmd->t_data_sg = NULL;
 714         se_cmd->t_data_nents = 0;
 715
 716         return 0;
 717 }
 718
 719 static int target_xcopy_write_destination(
 720         struct se_cmd *ec_cmd,
 721         struct xcopy_op *xop,
 722         struct se_device *dst_dev,
 723         sector_t dst_lba,
 724         u32 dst_sectors)
 725 {
 726         struct xcopy_pt_cmd *xpt_cmd;
 727         struct se_cmd *se_cmd;
 728         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 729         int rc;
 730         unsigned char cdb[16];
 731         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 732
 733         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 734         if (!xpt_cmd) {
 735                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 736                 return -ENOMEM;
 737         }
 738         init_completion(&xpt_cmd->xpt_passthrough_sem);
 739         se_cmd = &xpt_cmd->se_cmd;
 740
 741         memset(&cdb[0], 0, 16);
 742         cdb[0] = WRITE_16;
 743         put_unaligned_be64(dst_lba, &cdb[2]);
 744         put_unaligned_be32(dst_sectors, &cdb[10]);
 745         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 746                 (unsigned long long)dst_lba, dst_sectors, length);
 747
 748         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 749                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 750         xop->dst_pt_cmd = xpt_cmd;
 751
 752         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 753                                 remote_port, false);
 754         if (rc < 0) {
 755                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 756                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 757                 /*
 758                  * If the failure happened before the t_mem_list hand-off in
 759                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 760                  * core releases this memory on error during X-COPY WRITE I/O.
 761                  */
 762                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 763                 src_cmd->t_data_sg = xop->xop_data_sg;
 764                 src_cmd->t_data_nents = xop->xop_data_nents;
 765
 766                 transport_generic_free_cmd(se_cmd, 0);
 767                 return rc;
 768         }
 769
 770         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 771         if (rc < 0) {
 772                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 773                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 774                 transport_generic_free_cmd(se_cmd, 0);
 775                 return rc;
 776         }
 777
 778         return 0;
 779 }
 780
 781 static void target_xcopy_do_work(struct work_struct *work)
 782 {
 783         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 784         struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
 785         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 786         sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
 787         unsigned int max_sectors;
 788         int rc;
 789         unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
 790
 791         end_lba = src_lba + nolb;
 792         /*
 793          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 794          * smallest max_sectors between src_dev + dev_dev, or
 795          */
 796         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 797                           dst_dev->dev_attrib.hw_max_sectors);
 798         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 799
 800         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 801
 802         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 803                         nolb, max_nolb, (unsigned long long)end_lba);
 804         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 805                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 806
 807         while (src_lba < end_lba) {
 808                 cur_nolb = min(nolb, max_nolb);
 809
 810                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 811                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 812
 813                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 814                 if (rc < 0)
 815                         goto out;
 816
 817                 src_lba += cur_nolb;
 818                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 819                                 (unsigned long long)src_lba);
 820
 821                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 822                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 823
 824                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 825                                                 dst_lba, cur_nolb);
 826                 if (rc < 0) {
 827                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 828                         goto out;
 829                 }
 830
 831                 dst_lba += cur_nolb;
 832                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 833                                 (unsigned long long)dst_lba);
 834
 835                 copied_nolb += cur_nolb;
 836                 nolb -= cur_nolb;
 837
 838                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 839                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 840
 841                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 842         }
 843
 844         xcopy_pt_undepend_remotedev(xop);
 845         kfree(xop);
 846
 847         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 848                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 849         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 850                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 851
 852         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 853         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 854         return;
 855
 856 out:
 857         xcopy_pt_undepend_remotedev(xop);
 858         kfree(xop);
 859         /*
 860          * Don't override an error scsi status if it has already been set
 861          */
 862         if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
 863                 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
 864                         " CHECK_CONDITION -> sending response\n", rc);
 865                 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 866         }
 867         target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
 868 }
 869
 870 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 871 {
 872         struct se_device *dev = se_cmd->se_dev;
 873         struct xcopy_op *xop = NULL;
 874         unsigned char *p = NULL, *seg_desc;
 875         unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
 876         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 877         int rc;
 878         unsigned short tdll;
 879
 880         if (!dev->dev_attrib.emulate_3pc) {
 881                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 882                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 883         }
 884
 885         sa = se_cmd->t_task_cdb[1] & 0x1f;
 886         if (sa != 0x00) {
 887                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 888                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 889         }
 890
 891         if (se_cmd->data_length == 0) {
 892                 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
 893                 return TCM_NO_SENSE;
 894         }
 895         if (se_cmd->data_length < XCOPY_HDR_LEN) {
 896                 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
 897                                 se_cmd->data_length, XCOPY_HDR_LEN);
 898                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
 899         }
 900
 901         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
 902         if (!xop) {
 903                 pr_err("Unable to allocate xcopy_op\n");
 904                 return TCM_OUT_OF_RESOURCES;
 905         }
 906         xop->xop_se_cmd = se_cmd;
 907
 908         p = transport_kmap_data_sg(se_cmd);
 909         if (!p) {
 910                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 911                 kfree(xop);
 912                 return TCM_OUT_OF_RESOURCES;
 913         }
 914
 915         list_id = p[0];
 916         list_id_usage = (p[1] & 0x18) >> 3;
 917
 918         /*
 919          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 920          */
 921         tdll = get_unaligned_be16(&p[2]);
 922         sdll = get_unaligned_be32(&p[8]);
 923         if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
 924                 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
 925                        tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
 926                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 927                 goto out;
 928         }
 929
 930         inline_dl = get_unaligned_be32(&p[12]);
 931         if (inline_dl != 0) {
 932                 pr_err("XCOPY with non zero inline data length\n");
 933                 goto out;
 934         }
 935
 936         if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
 937                 pr_err("XCOPY parameter truncation: data length %u too small "
 938                         "for tdll: %hu sdll: %u inline_dl: %u\n",
 939                         se_cmd->data_length, tdll, sdll, inline_dl);
 940                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 941                 goto out;
 942         }
 943
 944         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 945                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 946                 tdll, sdll, inline_dl);
 947
 948         /*
 949          * skip over the target descriptors until segment descriptors
 950          * have been passed - CSCD ids are needed to determine src and dest.
 951          */
 952         seg_desc = &p[16] + tdll;
 953
 954         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
 955                                                     sdll, &ret);
 956         if (rc <= 0)
 957                 goto out;
 958
 959         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 960                                 rc * XCOPY_SEGMENT_DESC_LEN);
 961
 962         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
 963         if (rc <= 0)
 964                 goto out;
 965
 966         if (xop->src_dev->dev_attrib.block_size !=
 967             xop->dst_dev->dev_attrib.block_size) {
 968                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 969                        " block_size: %u currently unsupported\n",
 970                         xop->src_dev->dev_attrib.block_size,
 971                         xop->dst_dev->dev_attrib.block_size);
 972                 xcopy_pt_undepend_remotedev(xop);
 973                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 974                 goto out;
 975         }
 976
 977         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 978                                 rc * XCOPY_TARGET_DESC_LEN);
 979         transport_kunmap_data_sg(se_cmd);
 980
 981         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
 982         queue_work(xcopy_wq, &xop->xop_work);
 983         return TCM_NO_SENSE;
 984
 985 out:
 986         if (p)
 987                 transport_kunmap_data_sg(se_cmd);
 988         kfree(xop);
 989         return ret;
 990 }
 991
 992 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 993 {
 994         unsigned char *p;
 995
 996         p = transport_kmap_data_sg(se_cmd);
 997         if (!p) {
 998                 pr_err("transport_kmap_data_sg failed in"
 999                        " target_rcr_operating_parameters\n");
1000                 return TCM_OUT_OF_RESOURCES;
1001         }
1002
1003         if (se_cmd->data_length < 54) {
1004                 pr_err("Receive Copy Results Op Parameters length"
1005                        " too small: %u\n", se_cmd->data_length);
1006                 transport_kunmap_data_sg(se_cmd);
1007                 return TCM_INVALID_CDB_FIELD;
1008         }
1009         /*
1010          * Set SNLID=1 (Supports no List ID)
1011          */
1012         p[4] = 0x1;
1013         /*
1014          * MAXIMUM TARGET DESCRIPTOR COUNT
1015          */
1016         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1017         /*
1018          * MAXIMUM SEGMENT DESCRIPTOR COUNT
1019          */
1020         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1021         /*
1022          * MAXIMUM DESCRIPTOR LIST LENGTH
1023          */
1024         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1025         /*
1026          * MAXIMUM SEGMENT LENGTH
1027          */
1028         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1029         /*
1030          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1031          */
1032         put_unaligned_be32(0x0, &p[20]);
1033         /*
1034          * HELD DATA LIMIT
1035          */
1036         put_unaligned_be32(0x0, &p[24]);
1037         /*
1038          * MAXIMUM STREAM DEVICE TRANSFER SIZE
1039          */
1040         put_unaligned_be32(0x0, &p[28]);
1041         /*
1042          * TOTAL CONCURRENT COPIES
1043          */
1044         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1045         /*
1046          * MAXIMUM CONCURRENT COPIES
1047          */
1048         p[36] = RCR_OP_MAX_CONCURR_COPIES;
1049         /*
1050          * DATA SEGMENT GRANULARITY (log 2)
1051          */
1052         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1053         /*
1054          * INLINE DATA GRANULARITY log 2)
1055          */
1056         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1057         /*
1058          * HELD DATA GRANULARITY
1059          */
1060         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1061         /*
1062          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1063          */
1064         p[43] = 0x2;
1065         /*
1066          * List of implemented descriptor type codes (ordered)
1067          */
1068         p[44] = 0x02; /* Copy Block to Block device */
1069         p[45] = 0xe4; /* Identification descriptor target descriptor */
1070
1071         /*
1072          * AVAILABLE DATA (n-3)
1073          */
1074         put_unaligned_be32(42, &p[0]);
1075
1076         transport_kunmap_data_sg(se_cmd);
1077         target_complete_cmd(se_cmd, GOOD);
1078
1079         return TCM_NO_SENSE;
1080 }
1081
1082 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1083 {
1084         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1085         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1086         sense_reason_t rc = TCM_NO_SENSE;
1087
1088         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1089                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1090
1091         if (list_id != 0) {
1092                 pr_err("Receive Copy Results with non zero list identifier"
1093                        " not supported\n");
1094                 return TCM_INVALID_CDB_FIELD;
1095         }
1096
1097         switch (sa) {
1098         case RCR_SA_OPERATING_PARAMETERS:
1099                 rc = target_rcr_operating_parameters(se_cmd);
1100                 break;
1101         case RCR_SA_COPY_STATUS:
1102         case RCR_SA_RECEIVE_DATA:
1103         case RCR_SA_FAILED_SEGMENT_DETAILS:
1104         default:
1105                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1106                 return TCM_INVALID_CDB_FIELD;
1107         }
1108
1109         return rc;
1110 }