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 /**
  59  * target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers
  60  *
  61  * @se_dev: device being considered for match
  62  * @dev_wwn: XCOPY requested NAA dev_wwn
  63  * @return: 1 on match, 0 on no-match
  64  */
  65 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
  66                                               const unsigned char *dev_wwn)
  67 {
  68         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
  69         int rc;
  70
  71         if (!se_dev->dev_attrib.emulate_3pc) {
  72                 pr_debug("XCOPY: emulate_3pc disabled on se_dev %p\n", se_dev);
  73                 return 0;
  74         }
  75
  76         memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
  77         target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
  78
  79         rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  80         if (rc != 0) {
  81                 pr_debug("XCOPY: skip non-matching: %*ph\n",
  82                          XCOPY_NAA_IEEE_REGEX_LEN, tmp_dev_wwn);
  83                 return 0;
  84         }
  85         pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
  86
  87         return 1;
  88 }
  89
  90 static int target_xcopy_locate_se_dev_e4(struct se_session *sess,
  91                                         const unsigned char *dev_wwn,
  92                                         struct se_device **_found_dev,
  93                                         struct percpu_ref **_found_lun_ref)
  94 {
  95         struct se_dev_entry *deve;
  96         struct se_node_acl *nacl;
  97         struct se_lun *this_lun = NULL;
  98         struct se_device *found_dev = NULL;
  99
 100         /* cmd with NULL sess indicates no associated $FABRIC_MOD */
 101         if (!sess)
 102                 goto err_out;
 103
 104         pr_debug("XCOPY 0xe4: searching for: %*ph\n",
 105                  XCOPY_NAA_IEEE_REGEX_LEN, dev_wwn);
 106
 107         nacl = sess->se_node_acl;
 108         rcu_read_lock();
 109         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
 110                 struct se_device *this_dev;
 111                 int rc;
 112
 113                 this_lun = rcu_dereference(deve->se_lun);
 114                 this_dev = rcu_dereference_raw(this_lun->lun_se_dev);
 115
 116                 rc = target_xcopy_locate_se_dev_e4_iter(this_dev, dev_wwn);
 117                 if (rc) {
 118                         if (percpu_ref_tryget_live(&this_lun->lun_ref))
 119                                 found_dev = this_dev;
 120                         break;
 121                 }
 122         }
 123         rcu_read_unlock();
 124         if (found_dev == NULL)
 125                 goto err_out;
 126
 127         pr_debug("lun_ref held for se_dev: %p se_dev->se_dev_group: %p\n",
 128                  found_dev, &found_dev->dev_group);
 129         *_found_dev = found_dev;
 130         *_found_lun_ref = &this_lun->lun_ref;
 131         return 0;
 132 err_out:
 133         pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 134         return -EINVAL;
 135 }
 136
 137 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 138                                 unsigned char *p, unsigned short cscd_index)
 139 {
 140         unsigned char *desc = p;
 141         unsigned short ript;
 142         u8 desig_len;
 143         /*
 144          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 145          */
 146         ript = get_unaligned_be16(&desc[2]);
 147         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 148         /*
 149          * Check for supported code set, association, and designator type
 150          */
 151         if ((desc[4] & 0x0f) != 0x1) {
 152                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 153                 return -EINVAL;
 154         }
 155         if ((desc[5] & 0x30) != 0x00) {
 156                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 157                 return -EINVAL;
 158         }
 159         if ((desc[5] & 0x0f) != 0x3) {
 160                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 161                                 (desc[5] & 0x0f));
 162                 return -EINVAL;
 163         }
 164         /*
 165          * Check for matching 16 byte length for NAA IEEE Registered Extended
 166          * Assigned designator
 167          */
 168         desig_len = desc[7];
 169         if (desig_len != 16) {
 170                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 171                 return -EINVAL;
 172         }
 173         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 174         /*
 175          * Check for NAA IEEE Registered Extended Assigned header..
 176          */
 177         if ((desc[8] & 0xf0) != 0x60) {
 178                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 179                                         (desc[8] & 0xf0));
 180                 return -EINVAL;
 181         }
 182
 183         if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
 184                 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
 185                          "dest\n", cscd_index);
 186                 return 0;
 187         }
 188
 189         if (cscd_index == xop->stdi) {
 190                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 191                 /*
 192                  * Determine if the source designator matches the local device
 193                  */
 194                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 195                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 196                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 197                         xop->src_dev = se_cmd->se_dev;
 198                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 199                                         " received xop\n", xop->src_dev);
 200                 }
 201         }
 202
 203         if (cscd_index == xop->dtdi) {
 204                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 205                 /*
 206                  * Determine if the destination designator matches the local
 207                  * device. If @cscd_index corresponds to both source (stdi) and
 208                  * destination (dtdi), or dtdi comes after stdi, then
 209                  * XCOL_DEST_RECV_OP wins.
 210                  */
 211                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 212                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 213                         xop->op_origin = XCOL_DEST_RECV_OP;
 214                         xop->dst_dev = se_cmd->se_dev;
 215                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 216                                 " received xop\n", xop->dst_dev);
 217                 }
 218         }
 219
 220         return 0;
 221 }
 222
 223 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 224                                 struct xcopy_op *xop, unsigned char *p,
 225                                 unsigned short tdll, sense_reason_t *sense_ret)
 226 {
 227         struct se_device *local_dev = se_cmd->se_dev;
 228         unsigned char *desc = p;
 229         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
 230         unsigned short cscd_index = 0;
 231         unsigned short start = 0;
 232
 233         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 234
 235         if (offset != 0) {
 236                 pr_err("XCOPY target descriptor list length is not"
 237                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 238                 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 239                 return -EINVAL;
 240         }
 241         if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
 242                 pr_err("XCOPY target descriptor supports a maximum"
 243                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 244                 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
 245                 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
 246                 return -EINVAL;
 247         }
 248         /*
 249          * Generate an IEEE Registered Extended designator based upon the
 250          * se_device the XCOPY was received upon..
 251          */
 252         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 253         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 254
 255         while (start < tdll) {
 256                 /*
 257                  * Check target descriptor identification with 0xE4 type, and
 258                  * compare the current index with the CSCD descriptor IDs in
 259                  * the segment descriptor. Use VPD 0x83 WWPN matching ..
 260                  */
 261                 switch (desc[0]) {
 262                 case 0xe4:
 263                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 264                                                         &desc[0], cscd_index);
 265                         if (rc != 0)
 266                                 goto out;
 267                         start += XCOPY_TARGET_DESC_LEN;
 268                         desc += XCOPY_TARGET_DESC_LEN;
 269                         cscd_index++;
 270                         break;
 271                 default:
 272                         pr_err("XCOPY unsupported descriptor type code:"
 273                                         " 0x%02x\n", desc[0]);
 274                         *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 275                         goto out;
 276                 }
 277         }
 278
 279         switch (xop->op_origin) {
 280         case XCOL_SOURCE_RECV_OP:
 281                 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
 282                                                 xop->dst_tid_wwn,
 283                                                 &xop->dst_dev,
 284                                                 &xop->remote_lun_ref);
 285                 break;
 286         case XCOL_DEST_RECV_OP:
 287                 rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess,
 288                                                 xop->src_tid_wwn,
 289                                                 &xop->src_dev,
 290                                                 &xop->remote_lun_ref);
 291                 break;
 292         default:
 293                 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
 294                         "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
 295                 rc = -EINVAL;
 296                 break;
 297         }
 298         /*
 299          * If a matching IEEE NAA 0x83 descriptor for the requested device
 300          * is not located on this node, return COPY_ABORTED with ASQ/ASQC
 301          * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
 302          * initiator to fall back to normal copy method.
 303          */
 304         if (rc < 0) {
 305                 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
 306                 goto out;
 307         }
 308
 309         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 310                  xop->src_dev, &xop->src_tid_wwn[0]);
 311         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 312                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 313
 314         return cscd_index;
 315
 316 out:
 317         return -EINVAL;
 318 }
 319
 320 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 321                                         unsigned char *p)
 322 {
 323         unsigned char *desc = p;
 324         int dc = (desc[1] & 0x02);
 325         unsigned short desc_len;
 326
 327         desc_len = get_unaligned_be16(&desc[2]);
 328         if (desc_len != 0x18) {
 329                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 330                                 " %hu\n", desc_len);
 331                 return -EINVAL;
 332         }
 333
 334         xop->stdi = get_unaligned_be16(&desc[4]);
 335         xop->dtdi = get_unaligned_be16(&desc[6]);
 336
 337         if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
 338             xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
 339                 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
 340                         XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
 341                 return -EINVAL;
 342         }
 343
 344         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 345                 desc_len, xop->stdi, xop->dtdi, dc);
 346
 347         xop->nolb = get_unaligned_be16(&desc[10]);
 348         xop->src_lba = get_unaligned_be64(&desc[12]);
 349         xop->dst_lba = get_unaligned_be64(&desc[20]);
 350         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 351                 xop->nolb, (unsigned long long)xop->src_lba,
 352                 (unsigned long long)xop->dst_lba);
 353
 354         if (dc != 0) {
 355                 xop->dbl = get_unaligned_be24(&desc[29]);
 356
 357                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 358         }
 359         return 0;
 360 }
 361
 362 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 363                                 struct xcopy_op *xop, unsigned char *p,
 364                                 unsigned int sdll, sense_reason_t *sense_ret)
 365 {
 366         unsigned char *desc = p;
 367         unsigned int start = 0;
 368         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 369
 370         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 371
 372         if (offset != 0) {
 373                 pr_err("XCOPY segment descriptor list length is not"
 374                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 375                 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 376                 return -EINVAL;
 377         }
 378         if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
 379                 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
 380                         " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
 381                 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
 382                 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
 383                 return -EINVAL;
 384         }
 385
 386         while (start < sdll) {
 387                 /*
 388                  * Check segment descriptor type code for block -> block
 389                  */
 390                 switch (desc[0]) {
 391                 case 0x02:
 392                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 393                         if (rc < 0)
 394                                 goto out;
 395
 396                         ret++;
 397                         start += XCOPY_SEGMENT_DESC_LEN;
 398                         desc += XCOPY_SEGMENT_DESC_LEN;
 399                         break;
 400                 default:
 401                         pr_err("XCOPY unsupported segment descriptor"
 402                                 "type: 0x%02x\n", desc[0]);
 403                         *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 404                         goto out;
 405                 }
 406         }
 407
 408         return ret;
 409
 410 out:
 411         return -EINVAL;
 412 }
 413
 414 /*
 415  * Start xcopy_pt ops
 416  */
 417
 418 struct xcopy_pt_cmd {
 419         bool remote_port;
 420         struct se_cmd se_cmd;
 421         struct xcopy_op *xcopy_op;
 422         struct completion xpt_passthrough_sem;
 423         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 424 };
 425
 426 struct se_portal_group xcopy_pt_tpg;
 427 static struct se_session xcopy_pt_sess;
 428 static struct se_node_acl xcopy_pt_nacl;
 429
 430 static char *xcopy_pt_get_fabric_name(void)
 431 {
 432         return "xcopy-pt";
 433 }
 434
 435 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 436 {
 437         return 0;
 438 }
 439
 440 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 441 {
 442         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 443                 pr_debug("putting dst lun_ref for %p\n", xop->dst_dev);
 444         else
 445                 pr_debug("putting src lun_ref for %p\n", xop->src_dev);
 446
 447         percpu_ref_put(xop->remote_lun_ref);
 448 }
 449
 450 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 451 {
 452         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 453                                 struct xcopy_pt_cmd, se_cmd);
 454
 455         kfree(xpt_cmd);
 456 }
 457
 458 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 459 {
 460         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 461                                 struct xcopy_pt_cmd, se_cmd);
 462
 463         complete(&xpt_cmd->xpt_passthrough_sem);
 464         return 0;
 465 }
 466
 467 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 468 {
 469         return 0;
 470 }
 471
 472 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 473 {
 474         return 0;
 475 }
 476
 477 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 478 {
 479         return 0;
 480 }
 481
 482 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 483 {
 484         return 0;
 485 }
 486
 487 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 488         .get_fabric_name        = xcopy_pt_get_fabric_name,
 489         .get_cmd_state          = xcopy_pt_get_cmd_state,
 490         .release_cmd            = xcopy_pt_release_cmd,
 491         .check_stop_free        = xcopy_pt_check_stop_free,
 492         .write_pending          = xcopy_pt_write_pending,
 493         .write_pending_status   = xcopy_pt_write_pending_status,
 494         .queue_data_in          = xcopy_pt_queue_data_in,
 495         .queue_status           = xcopy_pt_queue_status,
 496 };
 497
 498 /*
 499  * End xcopy_pt_ops
 500  */
 501
 502 int target_xcopy_setup_pt(void)
 503 {
 504         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 505         if (!xcopy_wq) {
 506                 pr_err("Unable to allocate xcopy_wq\n");
 507                 return -ENOMEM;
 508         }
 509
 510         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 511         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 512         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 513         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 514
 515         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 516
 517         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 518         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 519         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 520         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 521         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 522         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 523         INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
 524         spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
 525
 526         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 527         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 528
 529         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 530         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 531
 532         return 0;
 533 }
 534
 535 void target_xcopy_release_pt(void)
 536 {
 537         if (xcopy_wq)
 538                 destroy_workqueue(xcopy_wq);
 539 }
 540
 541 static void target_xcopy_setup_pt_port(
 542         struct xcopy_pt_cmd *xpt_cmd,
 543         struct xcopy_op *xop,
 544         bool remote_port)
 545 {
 546         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 547         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 548
 549         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 550                 /*
 551                  * Honor destination port reservations for X-COPY PUSH emulation
 552                  * when CDB is received on local source port, and READs blocks to
 553                  * WRITE on remote destination port.
 554                  */
 555                 if (remote_port) {
 556                         xpt_cmd->remote_port = remote_port;
 557                 } else {
 558                         pt_cmd->se_lun = ec_cmd->se_lun;
 559                         pt_cmd->se_dev = ec_cmd->se_dev;
 560
 561                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 562                                 " %p\n", pt_cmd->se_dev);
 563                         pt_cmd->se_lun = ec_cmd->se_lun;
 564                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 565                                 pt_cmd->se_lun);
 566                 }
 567         } else {
 568                 /*
 569                  * Honor source port reservation for X-COPY PULL emulation
 570                  * when CDB is received on local desintation port, and READs
 571                  * blocks from the remote source port to WRITE on local
 572                  * destination port.
 573                  */
 574                 if (remote_port) {
 575                         xpt_cmd->remote_port = remote_port;
 576                 } else {
 577                         pt_cmd->se_lun = ec_cmd->se_lun;
 578                         pt_cmd->se_dev = ec_cmd->se_dev;
 579
 580                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 581                                 " %p\n", pt_cmd->se_dev);
 582                         pt_cmd->se_lun = ec_cmd->se_lun;
 583                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 584                                 pt_cmd->se_lun);
 585                 }
 586         }
 587 }
 588
 589 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 590                 struct se_cmd *pt_cmd, bool remote_port)
 591 {
 592         /*
 593          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 594          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 595          * target_xcopy_setup_pt_port()
 596          */
 597         if (remote_port) {
 598                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 599                         pt_cmd->se_dev);
 600                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 601                 pt_cmd->se_dev = se_dev;
 602         }
 603
 604         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 605 }
 606
 607 static int target_xcopy_setup_pt_cmd(
 608         struct xcopy_pt_cmd *xpt_cmd,
 609         struct xcopy_op *xop,
 610         struct se_device *se_dev,
 611         unsigned char *cdb,
 612         bool remote_port,
 613         bool alloc_mem)
 614 {
 615         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 616         sense_reason_t sense_rc;
 617         int ret = 0, rc;
 618         /*
 619          * Setup LUN+port to honor reservations based upon xop->op_origin for
 620          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 621          */
 622         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 623
 624         xpt_cmd->xcopy_op = xop;
 625         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 626
 627         cmd->tag = 0;
 628         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 629         if (sense_rc) {
 630                 ret = -EINVAL;
 631                 goto out;
 632         }
 633
 634         if (alloc_mem) {
 635                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 636                                       cmd->data_length, false, false);
 637                 if (rc < 0) {
 638                         ret = rc;
 639                         goto out;
 640                 }
 641                 /*
 642                  * Set this bit so that transport_free_pages() allows the
 643                  * caller to release SGLs + physical memory allocated by
 644                  * transport_generic_get_mem()..
 645                  */
 646                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 647         } else {
 648                 /*
 649                  * Here the previously allocated SGLs for the internal READ
 650                  * are mapped zero-copy to the internal WRITE.
 651                  */
 652                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 653                                         xop->xop_data_sg, xop->xop_data_nents,
 654                                         NULL, 0);
 655                 if (sense_rc) {
 656                         ret = -EINVAL;
 657                         goto out;
 658                 }
 659
 660                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 661                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 662         }
 663
 664         return 0;
 665
 666 out:
 667         return ret;
 668 }
 669
 670 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 671 {
 672         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 673         sense_reason_t sense_rc;
 674
 675         sense_rc = transport_generic_new_cmd(se_cmd);
 676         if (sense_rc)
 677                 return -EINVAL;
 678
 679         if (se_cmd->data_direction == DMA_TO_DEVICE)
 680                 target_execute_cmd(se_cmd);
 681
 682         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 683
 684         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 685                         se_cmd->scsi_status);
 686
 687         return (se_cmd->scsi_status) ? -EINVAL : 0;
 688 }
 689
 690 static int target_xcopy_read_source(
 691         struct se_cmd *ec_cmd,
 692         struct xcopy_op *xop,
 693         struct se_device *src_dev,
 694         sector_t src_lba,
 695         u32 src_sectors)
 696 {
 697         struct xcopy_pt_cmd *xpt_cmd;
 698         struct se_cmd *se_cmd;
 699         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 700         int rc;
 701         unsigned char cdb[16];
 702         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 703
 704         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 705         if (!xpt_cmd) {
 706                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 707                 return -ENOMEM;
 708         }
 709         init_completion(&xpt_cmd->xpt_passthrough_sem);
 710         se_cmd = &xpt_cmd->se_cmd;
 711
 712         memset(&cdb[0], 0, 16);
 713         cdb[0] = READ_16;
 714         put_unaligned_be64(src_lba, &cdb[2]);
 715         put_unaligned_be32(src_sectors, &cdb[10]);
 716         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 717                 (unsigned long long)src_lba, src_sectors, length);
 718
 719         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 720                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 721         xop->src_pt_cmd = xpt_cmd;
 722
 723         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 724                                 remote_port, true);
 725         if (rc < 0) {
 726                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 727                 transport_generic_free_cmd(se_cmd, 0);
 728                 return rc;
 729         }
 730
 731         xop->xop_data_sg = se_cmd->t_data_sg;
 732         xop->xop_data_nents = se_cmd->t_data_nents;
 733         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 734                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 735
 736         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 737         if (rc < 0) {
 738                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 739                 transport_generic_free_cmd(se_cmd, 0);
 740                 return rc;
 741         }
 742         /*
 743          * Clear off the allocated t_data_sg, that has been saved for
 744          * zero-copy WRITE submission reuse in struct xcopy_op..
 745          */
 746         se_cmd->t_data_sg = NULL;
 747         se_cmd->t_data_nents = 0;
 748
 749         return 0;
 750 }
 751
 752 static int target_xcopy_write_destination(
 753         struct se_cmd *ec_cmd,
 754         struct xcopy_op *xop,
 755         struct se_device *dst_dev,
 756         sector_t dst_lba,
 757         u32 dst_sectors)
 758 {
 759         struct xcopy_pt_cmd *xpt_cmd;
 760         struct se_cmd *se_cmd;
 761         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 762         int rc;
 763         unsigned char cdb[16];
 764         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 765
 766         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 767         if (!xpt_cmd) {
 768                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 769                 return -ENOMEM;
 770         }
 771         init_completion(&xpt_cmd->xpt_passthrough_sem);
 772         se_cmd = &xpt_cmd->se_cmd;
 773
 774         memset(&cdb[0], 0, 16);
 775         cdb[0] = WRITE_16;
 776         put_unaligned_be64(dst_lba, &cdb[2]);
 777         put_unaligned_be32(dst_sectors, &cdb[10]);
 778         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 779                 (unsigned long long)dst_lba, dst_sectors, length);
 780
 781         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 782                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 783         xop->dst_pt_cmd = xpt_cmd;
 784
 785         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 786                                 remote_port, false);
 787         if (rc < 0) {
 788                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 789                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 790                 /*
 791                  * If the failure happened before the t_mem_list hand-off in
 792                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 793                  * core releases this memory on error during X-COPY WRITE I/O.
 794                  */
 795                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 796                 src_cmd->t_data_sg = xop->xop_data_sg;
 797                 src_cmd->t_data_nents = xop->xop_data_nents;
 798
 799                 transport_generic_free_cmd(se_cmd, 0);
 800                 return rc;
 801         }
 802
 803         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 804         if (rc < 0) {
 805                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 806                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 807                 transport_generic_free_cmd(se_cmd, 0);
 808                 return rc;
 809         }
 810
 811         return 0;
 812 }
 813
 814 static void target_xcopy_do_work(struct work_struct *work)
 815 {
 816         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 817         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 818         struct se_device *src_dev, *dst_dev;
 819         sector_t src_lba, dst_lba, end_lba;
 820         unsigned int max_sectors;
 821         int rc = 0;
 822         unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
 823
 824         if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
 825                 goto err_free;
 826
 827         if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
 828                 goto err_free;
 829
 830         src_dev = xop->src_dev;
 831         dst_dev = xop->dst_dev;
 832         src_lba = xop->src_lba;
 833         dst_lba = xop->dst_lba;
 834         nolb = xop->nolb;
 835         end_lba = src_lba + nolb;
 836         /*
 837          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 838          * smallest max_sectors between src_dev + dev_dev, or
 839          */
 840         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 841                           dst_dev->dev_attrib.hw_max_sectors);
 842         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 843
 844         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 845
 846         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 847                         nolb, max_nolb, (unsigned long long)end_lba);
 848         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 849                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 850
 851         while (src_lba < end_lba) {
 852                 cur_nolb = min(nolb, max_nolb);
 853
 854                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 855                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 856
 857                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 858                 if (rc < 0)
 859                         goto out;
 860
 861                 src_lba += cur_nolb;
 862                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 863                                 (unsigned long long)src_lba);
 864
 865                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 866                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 867
 868                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 869                                                 dst_lba, cur_nolb);
 870                 if (rc < 0) {
 871                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 872                         goto out;
 873                 }
 874
 875                 dst_lba += cur_nolb;
 876                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 877                                 (unsigned long long)dst_lba);
 878
 879                 copied_nolb += cur_nolb;
 880                 nolb -= cur_nolb;
 881
 882                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 883                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 884
 885                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 886         }
 887
 888         xcopy_pt_undepend_remotedev(xop);
 889         kfree(xop);
 890
 891         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 892                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 893         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 894                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 895
 896         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 897         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 898         return;
 899
 900 out:
 901         xcopy_pt_undepend_remotedev(xop);
 902
 903 err_free:
 904         kfree(xop);
 905         /*
 906          * Don't override an error scsi status if it has already been set
 907          */
 908         if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
 909                 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
 910                         " CHECK_CONDITION -> sending response\n", rc);
 911                 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 912         }
 913         target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
 914 }
 915
 916 /*
 917  * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
 918  * fails.
 919  */
 920 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
 921 {
 922         struct se_cmd *se_cmd = xop->xop_se_cmd;
 923         unsigned char *p = NULL, *seg_desc;
 924         unsigned int list_id, list_id_usage, sdll, inline_dl;
 925         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 926         int rc;
 927         unsigned short tdll;
 928
 929         p = transport_kmap_data_sg(se_cmd);
 930         if (!p) {
 931                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 932                 return TCM_OUT_OF_RESOURCES;
 933         }
 934
 935         list_id = p[0];
 936         list_id_usage = (p[1] & 0x18) >> 3;
 937
 938         /*
 939          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 940          */
 941         tdll = get_unaligned_be16(&p[2]);
 942         sdll = get_unaligned_be32(&p[8]);
 943         if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
 944                 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
 945                        tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
 946                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 947                 goto out;
 948         }
 949
 950         inline_dl = get_unaligned_be32(&p[12]);
 951         if (inline_dl != 0) {
 952                 pr_err("XCOPY with non zero inline data length\n");
 953                 goto out;
 954         }
 955
 956         if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
 957                 pr_err("XCOPY parameter truncation: data length %u too small "
 958                         "for tdll: %hu sdll: %u inline_dl: %u\n",
 959                         se_cmd->data_length, tdll, sdll, inline_dl);
 960                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 961                 goto out;
 962         }
 963
 964         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 965                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 966                 tdll, sdll, inline_dl);
 967
 968         /*
 969          * skip over the target descriptors until segment descriptors
 970          * have been passed - CSCD ids are needed to determine src and dest.
 971          */
 972         seg_desc = &p[16] + tdll;
 973
 974         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
 975                                                     sdll, &ret);
 976         if (rc <= 0)
 977                 goto out;
 978
 979         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 980                                 rc * XCOPY_SEGMENT_DESC_LEN);
 981
 982         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
 983         if (rc <= 0)
 984                 goto out;
 985
 986         if (xop->src_dev->dev_attrib.block_size !=
 987             xop->dst_dev->dev_attrib.block_size) {
 988                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 989                        " block_size: %u currently unsupported\n",
 990                         xop->src_dev->dev_attrib.block_size,
 991                         xop->dst_dev->dev_attrib.block_size);
 992                 xcopy_pt_undepend_remotedev(xop);
 993                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 994                 goto out;
 995         }
 996
 997         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 998                                 rc * XCOPY_TARGET_DESC_LEN);
 999         transport_kunmap_data_sg(se_cmd);
1000         return TCM_NO_SENSE;
1001
1002 out:
1003         if (p)
1004                 transport_kunmap_data_sg(se_cmd);
1005         return ret;
1006 }
1007
1008 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
1009 {
1010         struct se_device *dev = se_cmd->se_dev;
1011         struct xcopy_op *xop;
1012         unsigned int sa;
1013
1014         if (!dev->dev_attrib.emulate_3pc) {
1015                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
1016                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1017         }
1018
1019         sa = se_cmd->t_task_cdb[1] & 0x1f;
1020         if (sa != 0x00) {
1021                 pr_err("EXTENDED_COPY(LID4) not supported\n");
1022                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1023         }
1024
1025         if (se_cmd->data_length == 0) {
1026                 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1027                 return TCM_NO_SENSE;
1028         }
1029         if (se_cmd->data_length < XCOPY_HDR_LEN) {
1030                 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
1031                                 se_cmd->data_length, XCOPY_HDR_LEN);
1032                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1033         }
1034
1035         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1036         if (!xop)
1037                 goto err;
1038         xop->xop_se_cmd = se_cmd;
1039         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1040         if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1041                 goto free;
1042         return TCM_NO_SENSE;
1043
1044 free:
1045         kfree(xop);
1046
1047 err:
1048         return TCM_OUT_OF_RESOURCES;
1049 }
1050
1051 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1052 {
1053         unsigned char *p;
1054
1055         p = transport_kmap_data_sg(se_cmd);
1056         if (!p) {
1057                 pr_err("transport_kmap_data_sg failed in"
1058                        " target_rcr_operating_parameters\n");
1059                 return TCM_OUT_OF_RESOURCES;
1060         }
1061
1062         if (se_cmd->data_length < 54) {
1063                 pr_err("Receive Copy Results Op Parameters length"
1064                        " too small: %u\n", se_cmd->data_length);
1065                 transport_kunmap_data_sg(se_cmd);
1066                 return TCM_INVALID_CDB_FIELD;
1067         }
1068         /*
1069          * Set SNLID=1 (Supports no List ID)
1070          */
1071         p[4] = 0x1;
1072         /*
1073          * MAXIMUM TARGET DESCRIPTOR COUNT
1074          */
1075         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1076         /*
1077          * MAXIMUM SEGMENT DESCRIPTOR COUNT
1078          */
1079         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1080         /*
1081          * MAXIMUM DESCRIPTOR LIST LENGTH
1082          */
1083         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1084         /*
1085          * MAXIMUM SEGMENT LENGTH
1086          */
1087         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1088         /*
1089          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1090          */
1091         put_unaligned_be32(0x0, &p[20]);
1092         /*
1093          * HELD DATA LIMIT
1094          */
1095         put_unaligned_be32(0x0, &p[24]);
1096         /*
1097          * MAXIMUM STREAM DEVICE TRANSFER SIZE
1098          */
1099         put_unaligned_be32(0x0, &p[28]);
1100         /*
1101          * TOTAL CONCURRENT COPIES
1102          */
1103         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1104         /*
1105          * MAXIMUM CONCURRENT COPIES
1106          */
1107         p[36] = RCR_OP_MAX_CONCURR_COPIES;
1108         /*
1109          * DATA SEGMENT GRANULARITY (log 2)
1110          */
1111         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1112         /*
1113          * INLINE DATA GRANULARITY log 2)
1114          */
1115         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1116         /*
1117          * HELD DATA GRANULARITY
1118          */
1119         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1120         /*
1121          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1122          */
1123         p[43] = 0x2;
1124         /*
1125          * List of implemented descriptor type codes (ordered)
1126          */
1127         p[44] = 0x02; /* Copy Block to Block device */
1128         p[45] = 0xe4; /* Identification descriptor target descriptor */
1129
1130         /*
1131          * AVAILABLE DATA (n-3)
1132          */
1133         put_unaligned_be32(42, &p[0]);
1134
1135         transport_kunmap_data_sg(se_cmd);
1136         target_complete_cmd(se_cmd, GOOD);
1137
1138         return TCM_NO_SENSE;
1139 }
1140
1141 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1142 {
1143         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1144         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1145         sense_reason_t rc = TCM_NO_SENSE;
1146
1147         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1148                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1149
1150         if (list_id != 0) {
1151                 pr_err("Receive Copy Results with non zero list identifier"
1152                        " not supported\n");
1153                 return TCM_INVALID_CDB_FIELD;
1154         }
1155
1156         switch (sa) {
1157         case RCR_SA_OPERATING_PARAMETERS:
1158                 rc = target_rcr_operating_parameters(se_cmd);
1159                 break;
1160         case RCR_SA_COPY_STATUS:
1161         case RCR_SA_RECEIVE_DATA:
1162         case RCR_SA_FAILED_SEGMENT_DETAILS:
1163         default:
1164                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1165                 return TCM_INVALID_CDB_FIELD;
1166         }
1167
1168         return rc;
1169 }