kernel/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 #include <target/target_core_configfs.h>
  36
  37 #include "target_core_internal.h"
  38 #include "target_core_pr.h"
  39 #include "target_core_ua.h"
  40 #include "target_core_xcopy.h"
  41
  42 static struct workqueue_struct *xcopy_wq = NULL;
  43
  44 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
  45 {
  46         int off = 0;
  47
  48         buf[off++] = (0x6 << 4);
  49         buf[off++] = 0x01;
  50         buf[off++] = 0x40;
  51         buf[off] = (0x5 << 4);
  52
  53         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
  54         return 0;
  55 }
  56
  57 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
  58                                         bool src)
  59 {
  60         struct se_device *se_dev;
  61         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
  62         int rc;
  63
  64         if (src)
  65                 dev_wwn = &xop->dst_tid_wwn[0];
  66         else
  67                 dev_wwn = &xop->src_tid_wwn[0];
  68
  69         mutex_lock(&g_device_mutex);
  70         list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
  71
  72                 if (!se_dev->dev_attrib.emulate_3pc)
  73                         continue;
  74
  75                 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
  76                 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
  77
  78                 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  79                 if (rc != 0)
  80                         continue;
  81
  82                 if (src) {
  83                         xop->dst_dev = se_dev;
  84                         pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
  85                                 " se_dev\n", xop->dst_dev);
  86                 } else {
  87                         xop->src_dev = se_dev;
  88                         pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
  89                                 " se_dev\n", xop->src_dev);
  90                 }
  91
  92                 rc = target_depend_item(&se_dev->dev_group.cg_item);
  93                 if (rc != 0) {
  94                         pr_err("configfs_depend_item attempt failed:"
  95                                 " %d for se_dev: %p\n", rc, se_dev);
  96                         mutex_unlock(&g_device_mutex);
  97                         return rc;
  98                 }
  99
 100                 pr_debug("Called configfs_depend_item for se_dev: %p"
 101                         " se_dev->se_dev_group: %p\n", se_dev,
 102                         &se_dev->dev_group);
 103
 104                 mutex_unlock(&g_device_mutex);
 105                 return 0;
 106         }
 107         mutex_unlock(&g_device_mutex);
 108
 109         pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 110         return -EINVAL;
 111 }
 112
 113 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 114                                 unsigned char *p, bool src)
 115 {
 116         unsigned char *desc = p;
 117         unsigned short ript;
 118         u8 desig_len;
 119         /*
 120          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 121          */
 122         ript = get_unaligned_be16(&desc[2]);
 123         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 124         /*
 125          * Check for supported code set, association, and designator type
 126          */
 127         if ((desc[4] & 0x0f) != 0x1) {
 128                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 129                 return -EINVAL;
 130         }
 131         if ((desc[5] & 0x30) != 0x00) {
 132                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 133                 return -EINVAL;
 134         }
 135         if ((desc[5] & 0x0f) != 0x3) {
 136                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 137                                 (desc[5] & 0x0f));
 138                 return -EINVAL;
 139         }
 140         /*
 141          * Check for matching 16 byte length for NAA IEEE Registered Extended
 142          * Assigned designator
 143          */
 144         desig_len = desc[7];
 145         if (desig_len != 16) {
 146                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 147                 return -EINVAL;
 148         }
 149         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 150         /*
 151          * Check for NAA IEEE Registered Extended Assigned header..
 152          */
 153         if ((desc[8] & 0xf0) != 0x60) {
 154                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 155                                         (desc[8] & 0xf0));
 156                 return -EINVAL;
 157         }
 158
 159         if (src) {
 160                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 161                 /*
 162                  * Determine if the source designator matches the local device
 163                  */
 164                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 165                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 166                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 167                         xop->src_dev = se_cmd->se_dev;
 168                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 169                                         " received xop\n", xop->src_dev);
 170                 }
 171         } else {
 172                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 173                 /*
 174                  * Determine if the destination designator matches the local device
 175                  */
 176                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 177                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 178                         xop->op_origin = XCOL_DEST_RECV_OP;
 179                         xop->dst_dev = se_cmd->se_dev;
 180                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 181                                 " received xop\n", xop->dst_dev);
 182                 }
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 189                                 struct xcopy_op *xop, unsigned char *p,
 190                                 unsigned short tdll)
 191 {
 192         struct se_device *local_dev = se_cmd->se_dev;
 193         unsigned char *desc = p;
 194         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
 195         unsigned short start = 0;
 196         bool src = true;
 197
 198         if (offset != 0) {
 199                 pr_err("XCOPY target descriptor list length is not"
 200                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 201                 return -EINVAL;
 202         }
 203         if (tdll > 64) {
 204                 pr_err("XCOPY target descriptor supports a maximum"
 205                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 206                 return -EINVAL;
 207         }
 208         /*
 209          * Generate an IEEE Registered Extended designator based upon the
 210          * se_device the XCOPY was received upon..
 211          */
 212         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 213         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 214
 215         while (start < tdll) {
 216                 /*
 217                  * Check target descriptor identification with 0xE4 type with
 218                  * use VPD 0x83 WWPN matching ..
 219                  */
 220                 switch (desc[0]) {
 221                 case 0xe4:
 222                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 223                                                         &desc[0], src);
 224                         if (rc != 0)
 225                                 goto out;
 226                         /*
 227                          * Assume target descriptors are in source -> destination order..
 228                          */
 229                         if (src)
 230                                 src = false;
 231                         else
 232                                 src = true;
 233                         start += XCOPY_TARGET_DESC_LEN;
 234                         desc += XCOPY_TARGET_DESC_LEN;
 235                         ret++;
 236                         break;
 237                 default:
 238                         pr_err("XCOPY unsupported descriptor type code:"
 239                                         " 0x%02x\n", desc[0]);
 240                         goto out;
 241                 }
 242         }
 243
 244         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 245                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
 246         else
 247                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
 248
 249         if (rc < 0)
 250                 goto out;
 251
 252         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 253                  xop->src_dev, &xop->src_tid_wwn[0]);
 254         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 255                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 256
 257         return ret;
 258
 259 out:
 260         return -EINVAL;
 261 }
 262
 263 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 264                                         unsigned char *p)
 265 {
 266         unsigned char *desc = p;
 267         int dc = (desc[1] & 0x02);
 268         unsigned short desc_len;
 269
 270         desc_len = get_unaligned_be16(&desc[2]);
 271         if (desc_len != 0x18) {
 272                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 273                                 " %hu\n", desc_len);
 274                 return -EINVAL;
 275         }
 276
 277         xop->stdi = get_unaligned_be16(&desc[4]);
 278         xop->dtdi = get_unaligned_be16(&desc[6]);
 279         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 280                 desc_len, xop->stdi, xop->dtdi, dc);
 281
 282         xop->nolb = get_unaligned_be16(&desc[10]);
 283         xop->src_lba = get_unaligned_be64(&desc[12]);
 284         xop->dst_lba = get_unaligned_be64(&desc[20]);
 285         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 286                 xop->nolb, (unsigned long long)xop->src_lba,
 287                 (unsigned long long)xop->dst_lba);
 288
 289         if (dc != 0) {
 290                 xop->dbl = (desc[29] & 0xff) << 16;
 291                 xop->dbl |= (desc[30] & 0xff) << 8;
 292                 xop->dbl |= desc[31] & 0xff;
 293
 294                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 295         }
 296         return 0;
 297 }
 298
 299 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 300                                 struct xcopy_op *xop, unsigned char *p,
 301                                 unsigned int sdll)
 302 {
 303         unsigned char *desc = p;
 304         unsigned int start = 0;
 305         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 306
 307         if (offset != 0) {
 308                 pr_err("XCOPY segment descriptor list length is not"
 309                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 310                 return -EINVAL;
 311         }
 312
 313         while (start < sdll) {
 314                 /*
 315                  * Check segment descriptor type code for block -> block
 316                  */
 317                 switch (desc[0]) {
 318                 case 0x02:
 319                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 320                         if (rc < 0)
 321                                 goto out;
 322
 323                         ret++;
 324                         start += XCOPY_SEGMENT_DESC_LEN;
 325                         desc += XCOPY_SEGMENT_DESC_LEN;
 326                         break;
 327                 default:
 328                         pr_err("XCOPY unsupported segment descriptor"
 329                                 "type: 0x%02x\n", desc[0]);
 330                         goto out;
 331                 }
 332         }
 333
 334         return ret;
 335
 336 out:
 337         return -EINVAL;
 338 }
 339
 340 /*
 341  * Start xcopy_pt ops
 342  */
 343
 344 struct xcopy_pt_cmd {
 345         bool remote_port;
 346         struct se_cmd se_cmd;
 347         struct xcopy_op *xcopy_op;
 348         struct completion xpt_passthrough_sem;
 349         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 350 };
 351
 352 static struct se_port xcopy_pt_port;
 353 static struct se_portal_group xcopy_pt_tpg;
 354 static struct se_session xcopy_pt_sess;
 355 static struct se_node_acl xcopy_pt_nacl;
 356
 357 static char *xcopy_pt_get_fabric_name(void)
 358 {
 359         return "xcopy-pt";
 360 }
 361
 362 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
 363 {
 364         return 0;
 365 }
 366
 367 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 368 {
 369         return 0;
 370 }
 371
 372 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 373 {
 374         struct se_device *remote_dev;
 375
 376         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 377                 remote_dev = xop->dst_dev;
 378         else
 379                 remote_dev = xop->src_dev;
 380
 381         pr_debug("Calling configfs_undepend_item for"
 382                   " remote_dev: %p remote_dev->dev_group: %p\n",
 383                   remote_dev, &remote_dev->dev_group.cg_item);
 384
 385         target_undepend_item(&remote_dev->dev_group.cg_item);
 386 }
 387
 388 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 389 {
 390         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 391                                 struct xcopy_pt_cmd, se_cmd);
 392
 393         kfree(xpt_cmd);
 394 }
 395
 396 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 397 {
 398         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 399                                 struct xcopy_pt_cmd, se_cmd);
 400
 401         complete(&xpt_cmd->xpt_passthrough_sem);
 402         return 0;
 403 }
 404
 405 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 406 {
 407         return 0;
 408 }
 409
 410 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 411 {
 412         return 0;
 413 }
 414
 415 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 416 {
 417         return 0;
 418 }
 419
 420 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 421 {
 422         return 0;
 423 }
 424
 425 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 426         .get_fabric_name        = xcopy_pt_get_fabric_name,
 427         .get_task_tag           = xcopy_pt_get_tag,
 428         .get_cmd_state          = xcopy_pt_get_cmd_state,
 429         .release_cmd            = xcopy_pt_release_cmd,
 430         .check_stop_free        = xcopy_pt_check_stop_free,
 431         .write_pending          = xcopy_pt_write_pending,
 432         .write_pending_status   = xcopy_pt_write_pending_status,
 433         .queue_data_in          = xcopy_pt_queue_data_in,
 434         .queue_status           = xcopy_pt_queue_status,
 435 };
 436
 437 /*
 438  * End xcopy_pt_ops
 439  */
 440
 441 int target_xcopy_setup_pt(void)
 442 {
 443         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 444         if (!xcopy_wq) {
 445                 pr_err("Unable to allocate xcopy_wq\n");
 446                 return -ENOMEM;
 447         }
 448
 449         memset(&xcopy_pt_port, 0, sizeof(struct se_port));
 450         INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
 451         INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
 452         mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
 453
 454         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 455         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 456         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 457         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 458
 459         xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
 460         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 461
 462         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 463         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 464         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 465         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 466         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 467         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 468
 469         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 470         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 471
 472         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 473         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 474
 475         return 0;
 476 }
 477
 478 void target_xcopy_release_pt(void)
 479 {
 480         if (xcopy_wq)
 481                 destroy_workqueue(xcopy_wq);
 482 }
 483
 484 static void target_xcopy_setup_pt_port(
 485         struct xcopy_pt_cmd *xpt_cmd,
 486         struct xcopy_op *xop,
 487         bool remote_port)
 488 {
 489         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 490         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 491
 492         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 493                 /*
 494                  * Honor destination port reservations for X-COPY PUSH emulation
 495                  * when CDB is received on local source port, and READs blocks to
 496                  * WRITE on remote destination port.
 497                  */
 498                 if (remote_port) {
 499                         xpt_cmd->remote_port = remote_port;
 500                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 501                         pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
 502                                 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
 503                                 pt_cmd->se_lun->lun_sep);
 504                 } else {
 505                         pt_cmd->se_lun = ec_cmd->se_lun;
 506                         pt_cmd->se_dev = ec_cmd->se_dev;
 507
 508                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 509                                 " %p\n", pt_cmd->se_dev);
 510                         pt_cmd->se_lun = ec_cmd->se_lun;
 511                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 512                                 pt_cmd->se_lun);
 513                 }
 514         } else {
 515                 /*
 516                  * Honor source port reservation for X-COPY PULL emulation
 517                  * when CDB is received on local desintation port, and READs
 518                  * blocks from the remote source port to WRITE on local
 519                  * destination port.
 520                  */
 521                 if (remote_port) {
 522                         xpt_cmd->remote_port = remote_port;
 523                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 524                         pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
 525                                 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
 526                                 pt_cmd->se_lun->lun_sep);
 527                 } else {
 528                         pt_cmd->se_lun = ec_cmd->se_lun;
 529                         pt_cmd->se_dev = ec_cmd->se_dev;
 530
 531                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 532                                 " %p\n", pt_cmd->se_dev);
 533                         pt_cmd->se_lun = ec_cmd->se_lun;
 534                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 535                                 pt_cmd->se_lun);
 536                 }
 537         }
 538 }
 539
 540 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 541                 struct se_cmd *pt_cmd, bool remote_port)
 542 {
 543         /*
 544          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 545          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 546          * target_xcopy_setup_pt_port()
 547          */
 548         if (remote_port) {
 549                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 550                         pt_cmd->se_dev);
 551                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 552                 pt_cmd->se_dev = se_dev;
 553         }
 554
 555         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 556 }
 557
 558 static int target_xcopy_setup_pt_cmd(
 559         struct xcopy_pt_cmd *xpt_cmd,
 560         struct xcopy_op *xop,
 561         struct se_device *se_dev,
 562         unsigned char *cdb,
 563         bool remote_port,
 564         bool alloc_mem)
 565 {
 566         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 567         sense_reason_t sense_rc;
 568         int ret = 0, rc;
 569         /*
 570          * Setup LUN+port to honor reservations based upon xop->op_origin for
 571          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 572          */
 573         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 574
 575         xpt_cmd->xcopy_op = xop;
 576         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 577
 578         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 579         if (sense_rc) {
 580                 ret = -EINVAL;
 581                 goto out;
 582         }
 583
 584         if (alloc_mem) {
 585                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 586                                       cmd->data_length, false);
 587                 if (rc < 0) {
 588                         ret = rc;
 589                         goto out;
 590                 }
 591                 /*
 592                  * Set this bit so that transport_free_pages() allows the
 593                  * caller to release SGLs + physical memory allocated by
 594                  * transport_generic_get_mem()..
 595                  */
 596                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 597         } else {
 598                 /*
 599                  * Here the previously allocated SGLs for the internal READ
 600                  * are mapped zero-copy to the internal WRITE.
 601                  */
 602                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 603                                         xop->xop_data_sg, xop->xop_data_nents,
 604                                         NULL, 0);
 605                 if (sense_rc) {
 606                         ret = -EINVAL;
 607                         goto out;
 608                 }
 609
 610                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 611                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 612         }
 613
 614         return 0;
 615
 616 out:
 617         return ret;
 618 }
 619
 620 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 621 {
 622         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 623         sense_reason_t sense_rc;
 624
 625         sense_rc = transport_generic_new_cmd(se_cmd);
 626         if (sense_rc)
 627                 return -EINVAL;
 628
 629         if (se_cmd->data_direction == DMA_TO_DEVICE)
 630                 target_execute_cmd(se_cmd);
 631
 632         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 633
 634         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 635                         se_cmd->scsi_status);
 636
 637         return (se_cmd->scsi_status) ? -EINVAL : 0;
 638 }
 639
 640 static int target_xcopy_read_source(
 641         struct se_cmd *ec_cmd,
 642         struct xcopy_op *xop,
 643         struct se_device *src_dev,
 644         sector_t src_lba,
 645         u32 src_sectors)
 646 {
 647         struct xcopy_pt_cmd *xpt_cmd;
 648         struct se_cmd *se_cmd;
 649         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 650         int rc;
 651         unsigned char cdb[16];
 652         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 653
 654         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 655         if (!xpt_cmd) {
 656                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 657                 return -ENOMEM;
 658         }
 659         init_completion(&xpt_cmd->xpt_passthrough_sem);
 660         se_cmd = &xpt_cmd->se_cmd;
 661
 662         memset(&cdb[0], 0, 16);
 663         cdb[0] = READ_16;
 664         put_unaligned_be64(src_lba, &cdb[2]);
 665         put_unaligned_be32(src_sectors, &cdb[10]);
 666         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 667                 (unsigned long long)src_lba, src_sectors, length);
 668
 669         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 670                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 671         xop->src_pt_cmd = xpt_cmd;
 672
 673         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 674                                 remote_port, true);
 675         if (rc < 0) {
 676                 transport_generic_free_cmd(se_cmd, 0);
 677                 return rc;
 678         }
 679
 680         xop->xop_data_sg = se_cmd->t_data_sg;
 681         xop->xop_data_nents = se_cmd->t_data_nents;
 682         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 683                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 684
 685         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 686         if (rc < 0) {
 687                 transport_generic_free_cmd(se_cmd, 0);
 688                 return rc;
 689         }
 690         /*
 691          * Clear off the allocated t_data_sg, that has been saved for
 692          * zero-copy WRITE submission reuse in struct xcopy_op..
 693          */
 694         se_cmd->t_data_sg = NULL;
 695         se_cmd->t_data_nents = 0;
 696
 697         return 0;
 698 }
 699
 700 static int target_xcopy_write_destination(
 701         struct se_cmd *ec_cmd,
 702         struct xcopy_op *xop,
 703         struct se_device *dst_dev,
 704         sector_t dst_lba,
 705         u32 dst_sectors)
 706 {
 707         struct xcopy_pt_cmd *xpt_cmd;
 708         struct se_cmd *se_cmd;
 709         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 710         int rc;
 711         unsigned char cdb[16];
 712         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 713
 714         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 715         if (!xpt_cmd) {
 716                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 717                 return -ENOMEM;
 718         }
 719         init_completion(&xpt_cmd->xpt_passthrough_sem);
 720         se_cmd = &xpt_cmd->se_cmd;
 721
 722         memset(&cdb[0], 0, 16);
 723         cdb[0] = WRITE_16;
 724         put_unaligned_be64(dst_lba, &cdb[2]);
 725         put_unaligned_be32(dst_sectors, &cdb[10]);
 726         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 727                 (unsigned long long)dst_lba, dst_sectors, length);
 728
 729         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 730                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 731         xop->dst_pt_cmd = xpt_cmd;
 732
 733         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 734                                 remote_port, false);
 735         if (rc < 0) {
 736                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 737                 /*
 738                  * If the failure happened before the t_mem_list hand-off in
 739                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 740                  * core releases this memory on error during X-COPY WRITE I/O.
 741                  */
 742                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 743                 src_cmd->t_data_sg = xop->xop_data_sg;
 744                 src_cmd->t_data_nents = xop->xop_data_nents;
 745
 746                 transport_generic_free_cmd(se_cmd, 0);
 747                 return rc;
 748         }
 749
 750         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 751         if (rc < 0) {
 752                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 753                 transport_generic_free_cmd(se_cmd, 0);
 754                 return rc;
 755         }
 756
 757         return 0;
 758 }
 759
 760 static void target_xcopy_do_work(struct work_struct *work)
 761 {
 762         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 763         struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
 764         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 765         sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
 766         unsigned int max_sectors;
 767         int rc;
 768         unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
 769
 770         end_lba = src_lba + nolb;
 771         /*
 772          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 773          * smallest max_sectors between src_dev + dev_dev, or
 774          */
 775         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 776                           dst_dev->dev_attrib.hw_max_sectors);
 777         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 778
 779         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 780
 781         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 782                         nolb, max_nolb, (unsigned long long)end_lba);
 783         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 784                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 785
 786         while (src_lba < end_lba) {
 787                 cur_nolb = min(nolb, max_nolb);
 788
 789                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 790                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 791
 792                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 793                 if (rc < 0)
 794                         goto out;
 795
 796                 src_lba += cur_nolb;
 797                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 798                                 (unsigned long long)src_lba);
 799
 800                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 801                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 802
 803                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 804                                                 dst_lba, cur_nolb);
 805                 if (rc < 0) {
 806                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 807                         goto out;
 808                 }
 809
 810                 dst_lba += cur_nolb;
 811                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 812                                 (unsigned long long)dst_lba);
 813
 814                 copied_nolb += cur_nolb;
 815                 nolb -= cur_nolb;
 816
 817                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 818                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 819
 820                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 821         }
 822
 823         xcopy_pt_undepend_remotedev(xop);
 824         kfree(xop);
 825
 826         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 827                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 828         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 829                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 830
 831         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 832         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 833         return;
 834
 835 out:
 836         xcopy_pt_undepend_remotedev(xop);
 837         kfree(xop);
 838
 839         pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
 840         ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 841         target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
 842 }
 843
 844 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 845 {
 846         struct se_device *dev = se_cmd->se_dev;
 847         struct xcopy_op *xop = NULL;
 848         unsigned char *p = NULL, *seg_desc;
 849         unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
 850         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 851         int rc;
 852         unsigned short tdll;
 853
 854         if (!dev->dev_attrib.emulate_3pc) {
 855                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 856                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 857         }
 858
 859         sa = se_cmd->t_task_cdb[1] & 0x1f;
 860         if (sa != 0x00) {
 861                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 862                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 863         }
 864
 865         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
 866         if (!xop) {
 867                 pr_err("Unable to allocate xcopy_op\n");
 868                 return TCM_OUT_OF_RESOURCES;
 869         }
 870         xop->xop_se_cmd = se_cmd;
 871
 872         p = transport_kmap_data_sg(se_cmd);
 873         if (!p) {
 874                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 875                 kfree(xop);
 876                 return TCM_OUT_OF_RESOURCES;
 877         }
 878
 879         list_id = p[0];
 880         list_id_usage = (p[1] & 0x18) >> 3;
 881
 882         /*
 883          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 884          */
 885         tdll = get_unaligned_be16(&p[2]);
 886         sdll = get_unaligned_be32(&p[8]);
 887
 888         inline_dl = get_unaligned_be32(&p[12]);
 889         if (inline_dl != 0) {
 890                 pr_err("XCOPY with non zero inline data length\n");
 891                 goto out;
 892         }
 893
 894         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 895                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 896                 tdll, sdll, inline_dl);
 897
 898         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
 899         if (rc <= 0)
 900                 goto out;
 901
 902         if (xop->src_dev->dev_attrib.block_size !=
 903             xop->dst_dev->dev_attrib.block_size) {
 904                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 905                        " block_size: %u currently unsupported\n",
 906                         xop->src_dev->dev_attrib.block_size,
 907                         xop->dst_dev->dev_attrib.block_size);
 908                 xcopy_pt_undepend_remotedev(xop);
 909                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 910                 goto out;
 911         }
 912
 913         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 914                                 rc * XCOPY_TARGET_DESC_LEN);
 915         seg_desc = &p[16];
 916         seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
 917
 918         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
 919         if (rc <= 0) {
 920                 xcopy_pt_undepend_remotedev(xop);
 921                 goto out;
 922         }
 923         transport_kunmap_data_sg(se_cmd);
 924
 925         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 926                                 rc * XCOPY_SEGMENT_DESC_LEN);
 927         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
 928         queue_work(xcopy_wq, &xop->xop_work);
 929         return TCM_NO_SENSE;
 930
 931 out:
 932         if (p)
 933                 transport_kunmap_data_sg(se_cmd);
 934         kfree(xop);
 935         return ret;
 936 }
 937
 938 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 939 {
 940         unsigned char *p;
 941
 942         p = transport_kmap_data_sg(se_cmd);
 943         if (!p) {
 944                 pr_err("transport_kmap_data_sg failed in"
 945                        " target_rcr_operating_parameters\n");
 946                 return TCM_OUT_OF_RESOURCES;
 947         }
 948
 949         if (se_cmd->data_length < 54) {
 950                 pr_err("Receive Copy Results Op Parameters length"
 951                        " too small: %u\n", se_cmd->data_length);
 952                 transport_kunmap_data_sg(se_cmd);
 953                 return TCM_INVALID_CDB_FIELD;
 954         }
 955         /*
 956          * Set SNLID=1 (Supports no List ID)
 957          */
 958         p[4] = 0x1;
 959         /*
 960          * MAXIMUM TARGET DESCRIPTOR COUNT
 961          */
 962         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
 963         /*
 964          * MAXIMUM SEGMENT DESCRIPTOR COUNT
 965          */
 966         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
 967         /*
 968          * MAXIMUM DESCRIPTOR LIST LENGTH
 969          */
 970         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
 971         /*
 972          * MAXIMUM SEGMENT LENGTH
 973          */
 974         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
 975         /*
 976          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
 977          */
 978         put_unaligned_be32(0x0, &p[20]);
 979         /*
 980          * HELD DATA LIMIT
 981          */
 982         put_unaligned_be32(0x0, &p[24]);
 983         /*
 984          * MAXIMUM STREAM DEVICE TRANSFER SIZE
 985          */
 986         put_unaligned_be32(0x0, &p[28]);
 987         /*
 988          * TOTAL CONCURRENT COPIES
 989          */
 990         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
 991         /*
 992          * MAXIMUM CONCURRENT COPIES
 993          */
 994         p[36] = RCR_OP_MAX_CONCURR_COPIES;
 995         /*
 996          * DATA SEGMENT GRANULARITY (log 2)
 997          */
 998         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
 999         /*
1000          * INLINE DATA GRANULARITY log 2)
1001          */
1002         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1003         /*
1004          * HELD DATA GRANULARITY
1005          */
1006         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1007         /*
1008          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1009          */
1010         p[43] = 0x2;
1011         /*
1012          * List of implemented descriptor type codes (ordered)
1013          */
1014         p[44] = 0x02; /* Copy Block to Block device */
1015         p[45] = 0xe4; /* Identification descriptor target descriptor */
1016
1017         /*
1018          * AVAILABLE DATA (n-3)
1019          */
1020         put_unaligned_be32(42, &p[0]);
1021
1022         transport_kunmap_data_sg(se_cmd);
1023         target_complete_cmd(se_cmd, GOOD);
1024
1025         return TCM_NO_SENSE;
1026 }
1027
1028 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1029 {
1030         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1031         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1032         sense_reason_t rc = TCM_NO_SENSE;
1033
1034         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1035                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1036
1037         if (list_id != 0) {
1038                 pr_err("Receive Copy Results with non zero list identifier"
1039                        " not supported\n");
1040                 return TCM_INVALID_CDB_FIELD;
1041         }
1042
1043         switch (sa) {
1044         case RCR_SA_OPERATING_PARAMETERS:
1045                 rc = target_rcr_operating_parameters(se_cmd);
1046                 break;
1047         case RCR_SA_COPY_STATUS:
1048         case RCR_SA_RECEIVE_DATA:
1049         case RCR_SA_FAILED_SEGMENT_DETAILS:
1050         default:
1051                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1052                 return TCM_INVALID_CDB_FIELD;
1053         }
1054
1055         return rc;
1056 }