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         int ret;
 505
 506         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 507         if (!xcopy_wq) {
 508                 pr_err("Unable to allocate xcopy_wq\n");
 509                 return -ENOMEM;
 510         }
 511
 512         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 513         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 514         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 515         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 516
 517         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 518
 519         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 520         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 521         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 522         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 523         ret = transport_init_session(&xcopy_pt_sess);
 524         if (ret < 0)
 525                 return ret;
 526
 527         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 528         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 529
 530         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 531         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 532
 533         return 0;
 534 }
 535
 536 void target_xcopy_release_pt(void)
 537 {
 538         if (xcopy_wq)
 539                 destroy_workqueue(xcopy_wq);
 540 }
 541
 542 static void target_xcopy_setup_pt_port(
 543         struct xcopy_pt_cmd *xpt_cmd,
 544         struct xcopy_op *xop,
 545         bool remote_port)
 546 {
 547         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 548         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 549
 550         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 551                 /*
 552                  * Honor destination port reservations for X-COPY PUSH emulation
 553                  * when CDB is received on local source port, and READs blocks to
 554                  * WRITE on remote destination port.
 555                  */
 556                 if (remote_port) {
 557                         xpt_cmd->remote_port = remote_port;
 558                 } else {
 559                         pt_cmd->se_lun = ec_cmd->se_lun;
 560                         pt_cmd->se_dev = ec_cmd->se_dev;
 561
 562                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 563                                 " %p\n", pt_cmd->se_dev);
 564                         pt_cmd->se_lun = ec_cmd->se_lun;
 565                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 566                                 pt_cmd->se_lun);
 567                 }
 568         } else {
 569                 /*
 570                  * Honor source port reservation for X-COPY PULL emulation
 571                  * when CDB is received on local desintation port, and READs
 572                  * blocks from the remote source port to WRITE on local
 573                  * destination port.
 574                  */
 575                 if (remote_port) {
 576                         xpt_cmd->remote_port = remote_port;
 577                 } else {
 578                         pt_cmd->se_lun = ec_cmd->se_lun;
 579                         pt_cmd->se_dev = ec_cmd->se_dev;
 580
 581                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 582                                 " %p\n", pt_cmd->se_dev);
 583                         pt_cmd->se_lun = ec_cmd->se_lun;
 584                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 585                                 pt_cmd->se_lun);
 586                 }
 587         }
 588 }
 589
 590 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 591                 struct se_cmd *pt_cmd, bool remote_port)
 592 {
 593         /*
 594          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 595          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 596          * target_xcopy_setup_pt_port()
 597          */
 598         if (remote_port) {
 599                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 600                         pt_cmd->se_dev);
 601                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 602                 pt_cmd->se_dev = se_dev;
 603         }
 604
 605         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 606 }
 607
 608 static int target_xcopy_setup_pt_cmd(
 609         struct xcopy_pt_cmd *xpt_cmd,
 610         struct xcopy_op *xop,
 611         struct se_device *se_dev,
 612         unsigned char *cdb,
 613         bool remote_port,
 614         bool alloc_mem)
 615 {
 616         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 617         sense_reason_t sense_rc;
 618         int ret = 0, rc;
 619         /*
 620          * Setup LUN+port to honor reservations based upon xop->op_origin for
 621          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 622          */
 623         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 624
 625         xpt_cmd->xcopy_op = xop;
 626         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 627
 628         cmd->tag = 0;
 629         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 630         if (sense_rc) {
 631                 ret = -EINVAL;
 632                 goto out;
 633         }
 634
 635         if (alloc_mem) {
 636                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 637                                       cmd->data_length, false, false);
 638                 if (rc < 0) {
 639                         ret = rc;
 640                         goto out;
 641                 }
 642                 /*
 643                  * Set this bit so that transport_free_pages() allows the
 644                  * caller to release SGLs + physical memory allocated by
 645                  * transport_generic_get_mem()..
 646                  */
 647                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 648         } else {
 649                 /*
 650                  * Here the previously allocated SGLs for the internal READ
 651                  * are mapped zero-copy to the internal WRITE.
 652                  */
 653                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 654                                         xop->xop_data_sg, xop->xop_data_nents,
 655                                         NULL, 0);
 656                 if (sense_rc) {
 657                         ret = -EINVAL;
 658                         goto out;
 659                 }
 660
 661                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 662                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 663         }
 664
 665         return 0;
 666
 667 out:
 668         return ret;
 669 }
 670
 671 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 672 {
 673         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 674         sense_reason_t sense_rc;
 675
 676         sense_rc = transport_generic_new_cmd(se_cmd);
 677         if (sense_rc)
 678                 return -EINVAL;
 679
 680         if (se_cmd->data_direction == DMA_TO_DEVICE)
 681                 target_execute_cmd(se_cmd);
 682
 683         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 684
 685         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 686                         se_cmd->scsi_status);
 687
 688         return (se_cmd->scsi_status) ? -EINVAL : 0;
 689 }
 690
 691 static int target_xcopy_read_source(
 692         struct se_cmd *ec_cmd,
 693         struct xcopy_op *xop,
 694         struct se_device *src_dev,
 695         sector_t src_lba,
 696         u32 src_sectors)
 697 {
 698         struct xcopy_pt_cmd *xpt_cmd;
 699         struct se_cmd *se_cmd;
 700         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 701         int rc;
 702         unsigned char cdb[16];
 703         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 704
 705         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 706         if (!xpt_cmd) {
 707                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 708                 return -ENOMEM;
 709         }
 710         init_completion(&xpt_cmd->xpt_passthrough_sem);
 711         se_cmd = &xpt_cmd->se_cmd;
 712
 713         memset(&cdb[0], 0, 16);
 714         cdb[0] = READ_16;
 715         put_unaligned_be64(src_lba, &cdb[2]);
 716         put_unaligned_be32(src_sectors, &cdb[10]);
 717         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 718                 (unsigned long long)src_lba, src_sectors, length);
 719
 720         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 721                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 722         xop->src_pt_cmd = xpt_cmd;
 723
 724         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 725                                 remote_port, true);
 726         if (rc < 0) {
 727                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 728                 transport_generic_free_cmd(se_cmd, 0);
 729                 return rc;
 730         }
 731
 732         xop->xop_data_sg = se_cmd->t_data_sg;
 733         xop->xop_data_nents = se_cmd->t_data_nents;
 734         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 735                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 736
 737         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 738         if (rc < 0) {
 739                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 740                 transport_generic_free_cmd(se_cmd, 0);
 741                 return rc;
 742         }
 743         /*
 744          * Clear off the allocated t_data_sg, that has been saved for
 745          * zero-copy WRITE submission reuse in struct xcopy_op..
 746          */
 747         se_cmd->t_data_sg = NULL;
 748         se_cmd->t_data_nents = 0;
 749
 750         return 0;
 751 }
 752
 753 static int target_xcopy_write_destination(
 754         struct se_cmd *ec_cmd,
 755         struct xcopy_op *xop,
 756         struct se_device *dst_dev,
 757         sector_t dst_lba,
 758         u32 dst_sectors)
 759 {
 760         struct xcopy_pt_cmd *xpt_cmd;
 761         struct se_cmd *se_cmd;
 762         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 763         int rc;
 764         unsigned char cdb[16];
 765         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 766
 767         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 768         if (!xpt_cmd) {
 769                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 770                 return -ENOMEM;
 771         }
 772         init_completion(&xpt_cmd->xpt_passthrough_sem);
 773         se_cmd = &xpt_cmd->se_cmd;
 774
 775         memset(&cdb[0], 0, 16);
 776         cdb[0] = WRITE_16;
 777         put_unaligned_be64(dst_lba, &cdb[2]);
 778         put_unaligned_be32(dst_sectors, &cdb[10]);
 779         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 780                 (unsigned long long)dst_lba, dst_sectors, length);
 781
 782         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 783                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 784         xop->dst_pt_cmd = xpt_cmd;
 785
 786         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 787                                 remote_port, false);
 788         if (rc < 0) {
 789                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 790                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 791                 /*
 792                  * If the failure happened before the t_mem_list hand-off in
 793                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 794                  * core releases this memory on error during X-COPY WRITE I/O.
 795                  */
 796                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 797                 src_cmd->t_data_sg = xop->xop_data_sg;
 798                 src_cmd->t_data_nents = xop->xop_data_nents;
 799
 800                 transport_generic_free_cmd(se_cmd, 0);
 801                 return rc;
 802         }
 803
 804         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 805         if (rc < 0) {
 806                 ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status;
 807                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 808                 transport_generic_free_cmd(se_cmd, 0);
 809                 return rc;
 810         }
 811
 812         return 0;
 813 }
 814
 815 static void target_xcopy_do_work(struct work_struct *work)
 816 {
 817         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 818         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 819         struct se_device *src_dev, *dst_dev;
 820         sector_t src_lba, dst_lba, end_lba;
 821         unsigned int max_sectors;
 822         int rc = 0;
 823         unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0;
 824
 825         if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
 826                 goto err_free;
 827
 828         if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
 829                 goto err_free;
 830
 831         src_dev = xop->src_dev;
 832         dst_dev = xop->dst_dev;
 833         src_lba = xop->src_lba;
 834         dst_lba = xop->dst_lba;
 835         nolb = xop->nolb;
 836         end_lba = src_lba + nolb;
 837         /*
 838          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 839          * smallest max_sectors between src_dev + dev_dev, or
 840          */
 841         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 842                           dst_dev->dev_attrib.hw_max_sectors);
 843         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 844
 845         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 846
 847         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 848                         nolb, max_nolb, (unsigned long long)end_lba);
 849         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 850                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 851
 852         while (src_lba < end_lba) {
 853                 cur_nolb = min(nolb, max_nolb);
 854
 855                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 856                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 857
 858                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 859                 if (rc < 0)
 860                         goto out;
 861
 862                 src_lba += cur_nolb;
 863                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 864                                 (unsigned long long)src_lba);
 865
 866                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 867                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 868
 869                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 870                                                 dst_lba, cur_nolb);
 871                 if (rc < 0) {
 872                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 873                         goto out;
 874                 }
 875
 876                 dst_lba += cur_nolb;
 877                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 878                                 (unsigned long long)dst_lba);
 879
 880                 copied_nolb += cur_nolb;
 881                 nolb -= cur_nolb;
 882
 883                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 884                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 885
 886                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 887         }
 888
 889         xcopy_pt_undepend_remotedev(xop);
 890         kfree(xop);
 891
 892         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 893                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 894         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 895                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 896
 897         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 898         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 899         return;
 900
 901 out:
 902         xcopy_pt_undepend_remotedev(xop);
 903
 904 err_free:
 905         kfree(xop);
 906         /*
 907          * Don't override an error scsi status if it has already been set
 908          */
 909         if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
 910                 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
 911                         " CHECK_CONDITION -> sending response\n", rc);
 912                 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 913         }
 914         target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
 915 }
 916
 917 /*
 918  * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
 919  * fails.
 920  */
 921 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
 922 {
 923         struct se_cmd *se_cmd = xop->xop_se_cmd;
 924         unsigned char *p = NULL, *seg_desc;
 925         unsigned int list_id, list_id_usage, sdll, inline_dl;
 926         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 927         int rc;
 928         unsigned short tdll;
 929
 930         p = transport_kmap_data_sg(se_cmd);
 931         if (!p) {
 932                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 933                 return TCM_OUT_OF_RESOURCES;
 934         }
 935
 936         list_id = p[0];
 937         list_id_usage = (p[1] & 0x18) >> 3;
 938
 939         /*
 940          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 941          */
 942         tdll = get_unaligned_be16(&p[2]);
 943         sdll = get_unaligned_be32(&p[8]);
 944         if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
 945                 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
 946                        tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
 947                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 948                 goto out;
 949         }
 950
 951         inline_dl = get_unaligned_be32(&p[12]);
 952         if (inline_dl != 0) {
 953                 pr_err("XCOPY with non zero inline data length\n");
 954                 goto out;
 955         }
 956
 957         if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
 958                 pr_err("XCOPY parameter truncation: data length %u too small "
 959                         "for tdll: %hu sdll: %u inline_dl: %u\n",
 960                         se_cmd->data_length, tdll, sdll, inline_dl);
 961                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 962                 goto out;
 963         }
 964
 965         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 966                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 967                 tdll, sdll, inline_dl);
 968
 969         /*
 970          * skip over the target descriptors until segment descriptors
 971          * have been passed - CSCD ids are needed to determine src and dest.
 972          */
 973         seg_desc = &p[16] + tdll;
 974
 975         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
 976                                                     sdll, &ret);
 977         if (rc <= 0)
 978                 goto out;
 979
 980         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 981                                 rc * XCOPY_SEGMENT_DESC_LEN);
 982
 983         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
 984         if (rc <= 0)
 985                 goto out;
 986
 987         if (xop->src_dev->dev_attrib.block_size !=
 988             xop->dst_dev->dev_attrib.block_size) {
 989                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 990                        " block_size: %u currently unsupported\n",
 991                         xop->src_dev->dev_attrib.block_size,
 992                         xop->dst_dev->dev_attrib.block_size);
 993                 xcopy_pt_undepend_remotedev(xop);
 994                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 995                 goto out;
 996         }
 997
 998         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 999                                 rc * XCOPY_TARGET_DESC_LEN);
1000         transport_kunmap_data_sg(se_cmd);
1001         return TCM_NO_SENSE;
1002
1003 out:
1004         if (p)
1005                 transport_kunmap_data_sg(se_cmd);
1006         return ret;
1007 }
1008
1009 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
1010 {
1011         struct se_device *dev = se_cmd->se_dev;
1012         struct xcopy_op *xop;
1013         unsigned int sa;
1014
1015         if (!dev->dev_attrib.emulate_3pc) {
1016                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
1017                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1018         }
1019
1020         sa = se_cmd->t_task_cdb[1] & 0x1f;
1021         if (sa != 0x00) {
1022                 pr_err("EXTENDED_COPY(LID4) not supported\n");
1023                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1024         }
1025
1026         if (se_cmd->data_length == 0) {
1027                 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
1028                 return TCM_NO_SENSE;
1029         }
1030         if (se_cmd->data_length < XCOPY_HDR_LEN) {
1031                 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
1032                                 se_cmd->data_length, XCOPY_HDR_LEN);
1033                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1034         }
1035
1036         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
1037         if (!xop)
1038                 goto err;
1039         xop->xop_se_cmd = se_cmd;
1040         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
1041         if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
1042                 goto free;
1043         return TCM_NO_SENSE;
1044
1045 free:
1046         kfree(xop);
1047
1048 err:
1049         return TCM_OUT_OF_RESOURCES;
1050 }
1051
1052 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
1053 {
1054         unsigned char *p;
1055
1056         p = transport_kmap_data_sg(se_cmd);
1057         if (!p) {
1058                 pr_err("transport_kmap_data_sg failed in"
1059                        " target_rcr_operating_parameters\n");
1060                 return TCM_OUT_OF_RESOURCES;
1061         }
1062
1063         if (se_cmd->data_length < 54) {
1064                 pr_err("Receive Copy Results Op Parameters length"
1065                        " too small: %u\n", se_cmd->data_length);
1066                 transport_kunmap_data_sg(se_cmd);
1067                 return TCM_INVALID_CDB_FIELD;
1068         }
1069         /*
1070          * Set SNLID=1 (Supports no List ID)
1071          */
1072         p[4] = 0x1;
1073         /*
1074          * MAXIMUM TARGET DESCRIPTOR COUNT
1075          */
1076         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
1077         /*
1078          * MAXIMUM SEGMENT DESCRIPTOR COUNT
1079          */
1080         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
1081         /*
1082          * MAXIMUM DESCRIPTOR LIST LENGTH
1083          */
1084         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1085         /*
1086          * MAXIMUM SEGMENT LENGTH
1087          */
1088         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1089         /*
1090          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1091          */
1092         put_unaligned_be32(0x0, &p[20]);
1093         /*
1094          * HELD DATA LIMIT
1095          */
1096         put_unaligned_be32(0x0, &p[24]);
1097         /*
1098          * MAXIMUM STREAM DEVICE TRANSFER SIZE
1099          */
1100         put_unaligned_be32(0x0, &p[28]);
1101         /*
1102          * TOTAL CONCURRENT COPIES
1103          */
1104         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1105         /*
1106          * MAXIMUM CONCURRENT COPIES
1107          */
1108         p[36] = RCR_OP_MAX_CONCURR_COPIES;
1109         /*
1110          * DATA SEGMENT GRANULARITY (log 2)
1111          */
1112         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1113         /*
1114          * INLINE DATA GRANULARITY log 2)
1115          */
1116         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1117         /*
1118          * HELD DATA GRANULARITY
1119          */
1120         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1121         /*
1122          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1123          */
1124         p[43] = 0x2;
1125         /*
1126          * List of implemented descriptor type codes (ordered)
1127          */
1128         p[44] = 0x02; /* Copy Block to Block device */
1129         p[45] = 0xe4; /* Identification descriptor target descriptor */
1130
1131         /*
1132          * AVAILABLE DATA (n-3)
1133          */
1134         put_unaligned_be32(42, &p[0]);
1135
1136         transport_kunmap_data_sg(se_cmd);
1137         target_complete_cmd(se_cmd, GOOD);
1138
1139         return TCM_NO_SENSE;
1140 }
1141
1142 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1143 {
1144         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1145         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1146         sense_reason_t rc = TCM_NO_SENSE;
1147
1148         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1149                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1150
1151         if (list_id != 0) {
1152                 pr_err("Receive Copy Results with non zero list identifier"
1153                        " not supported\n");
1154                 return TCM_INVALID_CDB_FIELD;
1155         }
1156
1157         switch (sa) {
1158         case RCR_SA_OPERATING_PARAMETERS:
1159                 rc = target_rcr_operating_parameters(se_cmd);
1160                 break;
1161         case RCR_SA_COPY_STATUS:
1162         case RCR_SA_RECEIVE_DATA:
1163         case RCR_SA_FAILED_SEGMENT_DETAILS:
1164         default:
1165                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1166                 return TCM_INVALID_CDB_FIELD;
1167         }
1168
1169         return rc;
1170 }