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 <scsi/scsi.h>
  29 #include <scsi/scsi_cmnd.h>
  30 #include <asm/unaligned.h>
  31
  32 #include <target/target_core_base.h>
  33 #include <target/target_core_backend.h>
  34 #include <target/target_core_fabric.h>
  35
  36 #include "target_core_internal.h"
  37 #include "target_core_pr.h"
  38 #include "target_core_ua.h"
  39 #include "target_core_xcopy.h"
  40
  41 static struct workqueue_struct *xcopy_wq = NULL;
  42
  43 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
  44 {
  45         int off = 0;
  46
  47         buf[off++] = (0x6 << 4);
  48         buf[off++] = 0x01;
  49         buf[off++] = 0x40;
  50         buf[off] = (0x5 << 4);
  51
  52         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
  53         return 0;
  54 }
  55
  56 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
  57                                         bool src)
  58 {
  59         struct se_device *se_dev;
  60         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
  61         int rc;
  62
  63         if (src)
  64                 dev_wwn = &xop->dst_tid_wwn[0];
  65         else
  66                 dev_wwn = &xop->src_tid_wwn[0];
  67
  68         mutex_lock(&g_device_mutex);
  69         list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
  70
  71                 if (!se_dev->dev_attrib.emulate_3pc)
  72                         continue;
  73
  74                 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
  75                 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
  76
  77                 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  78                 if (rc != 0)
  79                         continue;
  80
  81                 if (src) {
  82                         xop->dst_dev = se_dev;
  83                         pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
  84                                 " se_dev\n", xop->dst_dev);
  85                 } else {
  86                         xop->src_dev = se_dev;
  87                         pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
  88                                 " se_dev\n", xop->src_dev);
  89                 }
  90
  91                 rc = target_depend_item(&se_dev->dev_group.cg_item);
  92                 if (rc != 0) {
  93                         pr_err("configfs_depend_item attempt failed:"
  94                                 " %d for se_dev: %p\n", rc, se_dev);
  95                         mutex_unlock(&g_device_mutex);
  96                         return rc;
  97                 }
  98
  99                 pr_debug("Called configfs_depend_item for se_dev: %p"
 100                         " se_dev->se_dev_group: %p\n", se_dev,
 101                         &se_dev->dev_group);
 102
 103                 mutex_unlock(&g_device_mutex);
 104                 return 0;
 105         }
 106         mutex_unlock(&g_device_mutex);
 107
 108         pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 109         return -EINVAL;
 110 }
 111
 112 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 113                                 unsigned char *p, bool src)
 114 {
 115         unsigned char *desc = p;
 116         unsigned short ript;
 117         u8 desig_len;
 118         /*
 119          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 120          */
 121         ript = get_unaligned_be16(&desc[2]);
 122         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 123         /*
 124          * Check for supported code set, association, and designator type
 125          */
 126         if ((desc[4] & 0x0f) != 0x1) {
 127                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 128                 return -EINVAL;
 129         }
 130         if ((desc[5] & 0x30) != 0x00) {
 131                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 132                 return -EINVAL;
 133         }
 134         if ((desc[5] & 0x0f) != 0x3) {
 135                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 136                                 (desc[5] & 0x0f));
 137                 return -EINVAL;
 138         }
 139         /*
 140          * Check for matching 16 byte length for NAA IEEE Registered Extended
 141          * Assigned designator
 142          */
 143         desig_len = desc[7];
 144         if (desig_len != 16) {
 145                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 146                 return -EINVAL;
 147         }
 148         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 149         /*
 150          * Check for NAA IEEE Registered Extended Assigned header..
 151          */
 152         if ((desc[8] & 0xf0) != 0x60) {
 153                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 154                                         (desc[8] & 0xf0));
 155                 return -EINVAL;
 156         }
 157
 158         if (src) {
 159                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 160                 /*
 161                  * Determine if the source designator matches the local device
 162                  */
 163                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 164                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 165                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 166                         xop->src_dev = se_cmd->se_dev;
 167                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 168                                         " received xop\n", xop->src_dev);
 169                 }
 170         } else {
 171                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 172                 /*
 173                  * Determine if the destination designator matches the local device
 174                  */
 175                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 176                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 177                         xop->op_origin = XCOL_DEST_RECV_OP;
 178                         xop->dst_dev = se_cmd->se_dev;
 179                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 180                                 " received xop\n", xop->dst_dev);
 181                 }
 182         }
 183
 184         return 0;
 185 }
 186
 187 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 188                                 struct xcopy_op *xop, unsigned char *p,
 189                                 unsigned short tdll)
 190 {
 191         struct se_device *local_dev = se_cmd->se_dev;
 192         unsigned char *desc = p;
 193         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
 194         unsigned short start = 0;
 195         bool src = true;
 196
 197         if (offset != 0) {
 198                 pr_err("XCOPY target descriptor list length is not"
 199                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 200                 return -EINVAL;
 201         }
 202         if (tdll > 64) {
 203                 pr_err("XCOPY target descriptor supports a maximum"
 204                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 205                 return -EINVAL;
 206         }
 207         /*
 208          * Generate an IEEE Registered Extended designator based upon the
 209          * se_device the XCOPY was received upon..
 210          */
 211         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 212         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 213
 214         while (start < tdll) {
 215                 /*
 216                  * Check target descriptor identification with 0xE4 type with
 217                  * use VPD 0x83 WWPN matching ..
 218                  */
 219                 switch (desc[0]) {
 220                 case 0xe4:
 221                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 222                                                         &desc[0], src);
 223                         if (rc != 0)
 224                                 goto out;
 225                         /*
 226                          * Assume target descriptors are in source -> destination order..
 227                          */
 228                         if (src)
 229                                 src = false;
 230                         else
 231                                 src = true;
 232                         start += XCOPY_TARGET_DESC_LEN;
 233                         desc += XCOPY_TARGET_DESC_LEN;
 234                         ret++;
 235                         break;
 236                 default:
 237                         pr_err("XCOPY unsupported descriptor type code:"
 238                                         " 0x%02x\n", desc[0]);
 239                         goto out;
 240                 }
 241         }
 242
 243         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 244                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
 245         else
 246                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
 247
 248         if (rc < 0)
 249                 goto out;
 250
 251         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 252                  xop->src_dev, &xop->src_tid_wwn[0]);
 253         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 254                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 255
 256         return ret;
 257
 258 out:
 259         return -EINVAL;
 260 }
 261
 262 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 263                                         unsigned char *p)
 264 {
 265         unsigned char *desc = p;
 266         int dc = (desc[1] & 0x02);
 267         unsigned short desc_len;
 268
 269         desc_len = get_unaligned_be16(&desc[2]);
 270         if (desc_len != 0x18) {
 271                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 272                                 " %hu\n", desc_len);
 273                 return -EINVAL;
 274         }
 275
 276         xop->stdi = get_unaligned_be16(&desc[4]);
 277         xop->dtdi = get_unaligned_be16(&desc[6]);
 278         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 279                 desc_len, xop->stdi, xop->dtdi, dc);
 280
 281         xop->nolb = get_unaligned_be16(&desc[10]);
 282         xop->src_lba = get_unaligned_be64(&desc[12]);
 283         xop->dst_lba = get_unaligned_be64(&desc[20]);
 284         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 285                 xop->nolb, (unsigned long long)xop->src_lba,
 286                 (unsigned long long)xop->dst_lba);
 287
 288         if (dc != 0) {
 289                 xop->dbl = (desc[29] & 0xff) << 16;
 290                 xop->dbl |= (desc[30] & 0xff) << 8;
 291                 xop->dbl |= desc[31] & 0xff;
 292
 293                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 294         }
 295         return 0;
 296 }
 297
 298 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 299                                 struct xcopy_op *xop, unsigned char *p,
 300                                 unsigned int sdll)
 301 {
 302         unsigned char *desc = p;
 303         unsigned int start = 0;
 304         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 305
 306         if (offset != 0) {
 307                 pr_err("XCOPY segment descriptor list length is not"
 308                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 309                 return -EINVAL;
 310         }
 311
 312         while (start < sdll) {
 313                 /*
 314                  * Check segment descriptor type code for block -> block
 315                  */
 316                 switch (desc[0]) {
 317                 case 0x02:
 318                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 319                         if (rc < 0)
 320                                 goto out;
 321
 322                         ret++;
 323                         start += XCOPY_SEGMENT_DESC_LEN;
 324                         desc += XCOPY_SEGMENT_DESC_LEN;
 325                         break;
 326                 default:
 327                         pr_err("XCOPY unsupported segment descriptor"
 328                                 "type: 0x%02x\n", desc[0]);
 329                         goto out;
 330                 }
 331         }
 332
 333         return ret;
 334
 335 out:
 336         return -EINVAL;
 337 }
 338
 339 /*
 340  * Start xcopy_pt ops
 341  */
 342
 343 struct xcopy_pt_cmd {
 344         bool remote_port;
 345         struct se_cmd se_cmd;
 346         struct xcopy_op *xcopy_op;
 347         struct completion xpt_passthrough_sem;
 348         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 349 };
 350
 351 static struct se_port xcopy_pt_port;
 352 static struct se_portal_group xcopy_pt_tpg;
 353 static struct se_session xcopy_pt_sess;
 354 static struct se_node_acl xcopy_pt_nacl;
 355
 356 static char *xcopy_pt_get_fabric_name(void)
 357 {
 358         return "xcopy-pt";
 359 }
 360
 361 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 362 {
 363         return 0;
 364 }
 365
 366 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 367 {
 368         struct se_device *remote_dev;
 369
 370         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 371                 remote_dev = xop->dst_dev;
 372         else
 373                 remote_dev = xop->src_dev;
 374
 375         pr_debug("Calling configfs_undepend_item for"
 376                   " remote_dev: %p remote_dev->dev_group: %p\n",
 377                   remote_dev, &remote_dev->dev_group.cg_item);
 378
 379         target_undepend_item(&remote_dev->dev_group.cg_item);
 380 }
 381
 382 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 383 {
 384         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 385                                 struct xcopy_pt_cmd, se_cmd);
 386
 387         kfree(xpt_cmd);
 388 }
 389
 390 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 391 {
 392         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 393                                 struct xcopy_pt_cmd, se_cmd);
 394
 395         complete(&xpt_cmd->xpt_passthrough_sem);
 396         return 0;
 397 }
 398
 399 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 400 {
 401         return 0;
 402 }
 403
 404 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 405 {
 406         return 0;
 407 }
 408
 409 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 410 {
 411         return 0;
 412 }
 413
 414 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 415 {
 416         return 0;
 417 }
 418
 419 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 420         .get_fabric_name        = xcopy_pt_get_fabric_name,
 421         .get_cmd_state          = xcopy_pt_get_cmd_state,
 422         .release_cmd            = xcopy_pt_release_cmd,
 423         .check_stop_free        = xcopy_pt_check_stop_free,
 424         .write_pending          = xcopy_pt_write_pending,
 425         .write_pending_status   = xcopy_pt_write_pending_status,
 426         .queue_data_in          = xcopy_pt_queue_data_in,
 427         .queue_status           = xcopy_pt_queue_status,
 428 };
 429
 430 /*
 431  * End xcopy_pt_ops
 432  */
 433
 434 int target_xcopy_setup_pt(void)
 435 {
 436         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 437         if (!xcopy_wq) {
 438                 pr_err("Unable to allocate xcopy_wq\n");
 439                 return -ENOMEM;
 440         }
 441
 442         memset(&xcopy_pt_port, 0, sizeof(struct se_port));
 443         INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
 444         INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
 445         mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
 446
 447         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 448         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 449         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 450         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 451
 452         xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
 453         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 454
 455         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 456         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 457         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 458         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 459         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 460         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 461
 462         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 463         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 464
 465         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 466         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 467
 468         return 0;
 469 }
 470
 471 void target_xcopy_release_pt(void)
 472 {
 473         if (xcopy_wq)
 474                 destroy_workqueue(xcopy_wq);
 475 }
 476
 477 static void target_xcopy_setup_pt_port(
 478         struct xcopy_pt_cmd *xpt_cmd,
 479         struct xcopy_op *xop,
 480         bool remote_port)
 481 {
 482         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 483         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 484
 485         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 486                 /*
 487                  * Honor destination port reservations for X-COPY PUSH emulation
 488                  * when CDB is received on local source port, and READs blocks to
 489                  * WRITE on remote destination port.
 490                  */
 491                 if (remote_port) {
 492                         xpt_cmd->remote_port = remote_port;
 493                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 494                         pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
 495                                 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
 496                                 pt_cmd->se_lun->lun_sep);
 497                 } else {
 498                         pt_cmd->se_lun = ec_cmd->se_lun;
 499                         pt_cmd->se_dev = ec_cmd->se_dev;
 500
 501                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 502                                 " %p\n", pt_cmd->se_dev);
 503                         pt_cmd->se_lun = ec_cmd->se_lun;
 504                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 505                                 pt_cmd->se_lun);
 506                 }
 507         } else {
 508                 /*
 509                  * Honor source port reservation for X-COPY PULL emulation
 510                  * when CDB is received on local desintation port, and READs
 511                  * blocks from the remote source port to WRITE on local
 512                  * destination port.
 513                  */
 514                 if (remote_port) {
 515                         xpt_cmd->remote_port = remote_port;
 516                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 517                         pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
 518                                 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
 519                                 pt_cmd->se_lun->lun_sep);
 520                 } else {
 521                         pt_cmd->se_lun = ec_cmd->se_lun;
 522                         pt_cmd->se_dev = ec_cmd->se_dev;
 523
 524                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 525                                 " %p\n", pt_cmd->se_dev);
 526                         pt_cmd->se_lun = ec_cmd->se_lun;
 527                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 528                                 pt_cmd->se_lun);
 529                 }
 530         }
 531 }
 532
 533 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 534                 struct se_cmd *pt_cmd, bool remote_port)
 535 {
 536         /*
 537          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 538          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 539          * target_xcopy_setup_pt_port()
 540          */
 541         if (remote_port) {
 542                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 543                         pt_cmd->se_dev);
 544                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 545                 pt_cmd->se_dev = se_dev;
 546         }
 547
 548         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 549 }
 550
 551 static int target_xcopy_setup_pt_cmd(
 552         struct xcopy_pt_cmd *xpt_cmd,
 553         struct xcopy_op *xop,
 554         struct se_device *se_dev,
 555         unsigned char *cdb,
 556         bool remote_port,
 557         bool alloc_mem)
 558 {
 559         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 560         sense_reason_t sense_rc;
 561         int ret = 0, rc;
 562         /*
 563          * Setup LUN+port to honor reservations based upon xop->op_origin for
 564          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 565          */
 566         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 567
 568         xpt_cmd->xcopy_op = xop;
 569         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 570
 571         cmd->tag = 0;
 572         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 573         if (sense_rc) {
 574                 ret = -EINVAL;
 575                 goto out;
 576         }
 577
 578         if (alloc_mem) {
 579                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 580                                       cmd->data_length, false);
 581                 if (rc < 0) {
 582                         ret = rc;
 583                         goto out;
 584                 }
 585                 /*
 586                  * Set this bit so that transport_free_pages() allows the
 587                  * caller to release SGLs + physical memory allocated by
 588                  * transport_generic_get_mem()..
 589                  */
 590                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 591         } else {
 592                 /*
 593                  * Here the previously allocated SGLs for the internal READ
 594                  * are mapped zero-copy to the internal WRITE.
 595                  */
 596                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 597                                         xop->xop_data_sg, xop->xop_data_nents,
 598                                         NULL, 0);
 599                 if (sense_rc) {
 600                         ret = -EINVAL;
 601                         goto out;
 602                 }
 603
 604                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 605                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 606         }
 607
 608         return 0;
 609
 610 out:
 611         return ret;
 612 }
 613
 614 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 615 {
 616         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 617         sense_reason_t sense_rc;
 618
 619         sense_rc = transport_generic_new_cmd(se_cmd);
 620         if (sense_rc)
 621                 return -EINVAL;
 622
 623         if (se_cmd->data_direction == DMA_TO_DEVICE)
 624                 target_execute_cmd(se_cmd);
 625
 626         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 627
 628         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 629                         se_cmd->scsi_status);
 630
 631         return (se_cmd->scsi_status) ? -EINVAL : 0;
 632 }
 633
 634 static int target_xcopy_read_source(
 635         struct se_cmd *ec_cmd,
 636         struct xcopy_op *xop,
 637         struct se_device *src_dev,
 638         sector_t src_lba,
 639         u32 src_sectors)
 640 {
 641         struct xcopy_pt_cmd *xpt_cmd;
 642         struct se_cmd *se_cmd;
 643         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 644         int rc;
 645         unsigned char cdb[16];
 646         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 647
 648         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 649         if (!xpt_cmd) {
 650                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 651                 return -ENOMEM;
 652         }
 653         init_completion(&xpt_cmd->xpt_passthrough_sem);
 654         se_cmd = &xpt_cmd->se_cmd;
 655
 656         memset(&cdb[0], 0, 16);
 657         cdb[0] = READ_16;
 658         put_unaligned_be64(src_lba, &cdb[2]);
 659         put_unaligned_be32(src_sectors, &cdb[10]);
 660         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 661                 (unsigned long long)src_lba, src_sectors, length);
 662
 663         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 664                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 665         xop->src_pt_cmd = xpt_cmd;
 666
 667         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 668                                 remote_port, true);
 669         if (rc < 0) {
 670                 transport_generic_free_cmd(se_cmd, 0);
 671                 return rc;
 672         }
 673
 674         xop->xop_data_sg = se_cmd->t_data_sg;
 675         xop->xop_data_nents = se_cmd->t_data_nents;
 676         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 677                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 678
 679         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 680         if (rc < 0) {
 681                 transport_generic_free_cmd(se_cmd, 0);
 682                 return rc;
 683         }
 684         /*
 685          * Clear off the allocated t_data_sg, that has been saved for
 686          * zero-copy WRITE submission reuse in struct xcopy_op..
 687          */
 688         se_cmd->t_data_sg = NULL;
 689         se_cmd->t_data_nents = 0;
 690
 691         return 0;
 692 }
 693
 694 static int target_xcopy_write_destination(
 695         struct se_cmd *ec_cmd,
 696         struct xcopy_op *xop,
 697         struct se_device *dst_dev,
 698         sector_t dst_lba,
 699         u32 dst_sectors)
 700 {
 701         struct xcopy_pt_cmd *xpt_cmd;
 702         struct se_cmd *se_cmd;
 703         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 704         int rc;
 705         unsigned char cdb[16];
 706         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 707
 708         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 709         if (!xpt_cmd) {
 710                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 711                 return -ENOMEM;
 712         }
 713         init_completion(&xpt_cmd->xpt_passthrough_sem);
 714         se_cmd = &xpt_cmd->se_cmd;
 715
 716         memset(&cdb[0], 0, 16);
 717         cdb[0] = WRITE_16;
 718         put_unaligned_be64(dst_lba, &cdb[2]);
 719         put_unaligned_be32(dst_sectors, &cdb[10]);
 720         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 721                 (unsigned long long)dst_lba, dst_sectors, length);
 722
 723         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 724                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 725         xop->dst_pt_cmd = xpt_cmd;
 726
 727         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 728                                 remote_port, false);
 729         if (rc < 0) {
 730                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 731                 /*
 732                  * If the failure happened before the t_mem_list hand-off in
 733                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 734                  * core releases this memory on error during X-COPY WRITE I/O.
 735                  */
 736                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 737                 src_cmd->t_data_sg = xop->xop_data_sg;
 738                 src_cmd->t_data_nents = xop->xop_data_nents;
 739
 740                 transport_generic_free_cmd(se_cmd, 0);
 741                 return rc;
 742         }
 743
 744         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 745         if (rc < 0) {
 746                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 747                 transport_generic_free_cmd(se_cmd, 0);
 748                 return rc;
 749         }
 750
 751         return 0;
 752 }
 753
 754 static void target_xcopy_do_work(struct work_struct *work)
 755 {
 756         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 757         struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
 758         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 759         sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
 760         unsigned int max_sectors;
 761         int rc;
 762         unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
 763
 764         end_lba = src_lba + nolb;
 765         /*
 766          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 767          * smallest max_sectors between src_dev + dev_dev, or
 768          */
 769         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 770                           dst_dev->dev_attrib.hw_max_sectors);
 771         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 772
 773         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 774
 775         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 776                         nolb, max_nolb, (unsigned long long)end_lba);
 777         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 778                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 779
 780         while (src_lba < end_lba) {
 781                 cur_nolb = min(nolb, max_nolb);
 782
 783                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 784                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 785
 786                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 787                 if (rc < 0)
 788                         goto out;
 789
 790                 src_lba += cur_nolb;
 791                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 792                                 (unsigned long long)src_lba);
 793
 794                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 795                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 796
 797                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 798                                                 dst_lba, cur_nolb);
 799                 if (rc < 0) {
 800                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 801                         goto out;
 802                 }
 803
 804                 dst_lba += cur_nolb;
 805                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 806                                 (unsigned long long)dst_lba);
 807
 808                 copied_nolb += cur_nolb;
 809                 nolb -= cur_nolb;
 810
 811                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 812                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 813
 814                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 815         }
 816
 817         xcopy_pt_undepend_remotedev(xop);
 818         kfree(xop);
 819
 820         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 821                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 822         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 823                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 824
 825         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 826         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 827         return;
 828
 829 out:
 830         xcopy_pt_undepend_remotedev(xop);
 831         kfree(xop);
 832
 833         pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
 834         ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 835         target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
 836 }
 837
 838 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 839 {
 840         struct se_device *dev = se_cmd->se_dev;
 841         struct xcopy_op *xop = NULL;
 842         unsigned char *p = NULL, *seg_desc;
 843         unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
 844         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 845         int rc;
 846         unsigned short tdll;
 847
 848         if (!dev->dev_attrib.emulate_3pc) {
 849                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 850                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 851         }
 852
 853         sa = se_cmd->t_task_cdb[1] & 0x1f;
 854         if (sa != 0x00) {
 855                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 856                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 857         }
 858
 859         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
 860         if (!xop) {
 861                 pr_err("Unable to allocate xcopy_op\n");
 862                 return TCM_OUT_OF_RESOURCES;
 863         }
 864         xop->xop_se_cmd = se_cmd;
 865
 866         p = transport_kmap_data_sg(se_cmd);
 867         if (!p) {
 868                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 869                 kfree(xop);
 870                 return TCM_OUT_OF_RESOURCES;
 871         }
 872
 873         list_id = p[0];
 874         list_id_usage = (p[1] & 0x18) >> 3;
 875
 876         /*
 877          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 878          */
 879         tdll = get_unaligned_be16(&p[2]);
 880         sdll = get_unaligned_be32(&p[8]);
 881
 882         inline_dl = get_unaligned_be32(&p[12]);
 883         if (inline_dl != 0) {
 884                 pr_err("XCOPY with non zero inline data length\n");
 885                 goto out;
 886         }
 887
 888         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 889                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 890                 tdll, sdll, inline_dl);
 891
 892         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
 893         if (rc <= 0)
 894                 goto out;
 895
 896         if (xop->src_dev->dev_attrib.block_size !=
 897             xop->dst_dev->dev_attrib.block_size) {
 898                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 899                        " block_size: %u currently unsupported\n",
 900                         xop->src_dev->dev_attrib.block_size,
 901                         xop->dst_dev->dev_attrib.block_size);
 902                 xcopy_pt_undepend_remotedev(xop);
 903                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 904                 goto out;
 905         }
 906
 907         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 908                                 rc * XCOPY_TARGET_DESC_LEN);
 909         seg_desc = &p[16];
 910         seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
 911
 912         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
 913         if (rc <= 0) {
 914                 xcopy_pt_undepend_remotedev(xop);
 915                 goto out;
 916         }
 917         transport_kunmap_data_sg(se_cmd);
 918
 919         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 920                                 rc * XCOPY_SEGMENT_DESC_LEN);
 921         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
 922         queue_work(xcopy_wq, &xop->xop_work);
 923         return TCM_NO_SENSE;
 924
 925 out:
 926         if (p)
 927                 transport_kunmap_data_sg(se_cmd);
 928         kfree(xop);
 929         return ret;
 930 }
 931
 932 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 933 {
 934         unsigned char *p;
 935
 936         p = transport_kmap_data_sg(se_cmd);
 937         if (!p) {
 938                 pr_err("transport_kmap_data_sg failed in"
 939                        " target_rcr_operating_parameters\n");
 940                 return TCM_OUT_OF_RESOURCES;
 941         }
 942
 943         if (se_cmd->data_length < 54) {
 944                 pr_err("Receive Copy Results Op Parameters length"
 945                        " too small: %u\n", se_cmd->data_length);
 946                 transport_kunmap_data_sg(se_cmd);
 947                 return TCM_INVALID_CDB_FIELD;
 948         }
 949         /*
 950          * Set SNLID=1 (Supports no List ID)
 951          */
 952         p[4] = 0x1;
 953         /*
 954          * MAXIMUM TARGET DESCRIPTOR COUNT
 955          */
 956         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
 957         /*
 958          * MAXIMUM SEGMENT DESCRIPTOR COUNT
 959          */
 960         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
 961         /*
 962          * MAXIMUM DESCRIPTOR LIST LENGTH
 963          */
 964         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
 965         /*
 966          * MAXIMUM SEGMENT LENGTH
 967          */
 968         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
 969         /*
 970          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
 971          */
 972         put_unaligned_be32(0x0, &p[20]);
 973         /*
 974          * HELD DATA LIMIT
 975          */
 976         put_unaligned_be32(0x0, &p[24]);
 977         /*
 978          * MAXIMUM STREAM DEVICE TRANSFER SIZE
 979          */
 980         put_unaligned_be32(0x0, &p[28]);
 981         /*
 982          * TOTAL CONCURRENT COPIES
 983          */
 984         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
 985         /*
 986          * MAXIMUM CONCURRENT COPIES
 987          */
 988         p[36] = RCR_OP_MAX_CONCURR_COPIES;
 989         /*
 990          * DATA SEGMENT GRANULARITY (log 2)
 991          */
 992         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
 993         /*
 994          * INLINE DATA GRANULARITY log 2)
 995          */
 996         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
 997         /*
 998          * HELD DATA GRANULARITY
 999          */
1000         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1001         /*
1002          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1003          */
1004         p[43] = 0x2;
1005         /*
1006          * List of implemented descriptor type codes (ordered)
1007          */
1008         p[44] = 0x02; /* Copy Block to Block device */
1009         p[45] = 0xe4; /* Identification descriptor target descriptor */
1010
1011         /*
1012          * AVAILABLE DATA (n-3)
1013          */
1014         put_unaligned_be32(42, &p[0]);
1015
1016         transport_kunmap_data_sg(se_cmd);
1017         target_complete_cmd(se_cmd, GOOD);
1018
1019         return TCM_NO_SENSE;
1020 }
1021
1022 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1023 {
1024         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1025         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1026         sense_reason_t rc = TCM_NO_SENSE;
1027
1028         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1029                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1030
1031         if (list_id != 0) {
1032                 pr_err("Receive Copy Results with non zero list identifier"
1033                        " not supported\n");
1034                 return TCM_INVALID_CDB_FIELD;
1035         }
1036
1037         switch (sa) {
1038         case RCR_SA_OPERATING_PARAMETERS:
1039                 rc = target_rcr_operating_parameters(se_cmd);
1040                 break;
1041         case RCR_SA_COPY_STATUS:
1042         case RCR_SA_RECEIVE_DATA:
1043         case RCR_SA_FAILED_SEGMENT_DETAILS:
1044         default:
1045                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1046                 return TCM_INVALID_CDB_FIELD;
1047         }
1048
1049         return rc;
1050 }