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         struct configfs_subsystem *subsys = target_core_subsystem[0];
  62         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
  63         int rc;
  64
  65         if (src)
  66                 dev_wwn = &xop->dst_tid_wwn[0];
  67         else
  68                 dev_wwn = &xop->src_tid_wwn[0];
  69
  70         mutex_lock(&g_device_mutex);
  71         list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
  72
  73                 if (!se_dev->dev_attrib.emulate_3pc)
  74                         continue;
  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                         continue;
  82
  83                 if (src) {
  84                         xop->dst_dev = se_dev;
  85                         pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
  86                                 " se_dev\n", xop->dst_dev);
  87                 } else {
  88                         xop->src_dev = se_dev;
  89                         pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
  90                                 " se_dev\n", xop->src_dev);
  91                 }
  92
  93                 rc = configfs_depend_item(subsys,
  94                                 &se_dev->dev_group.cg_item);
  95                 if (rc != 0) {
  96                         pr_err("configfs_depend_item attempt failed:"
  97                                 " %d for se_dev: %p\n", rc, se_dev);
  98                         mutex_unlock(&g_device_mutex);
  99                         return rc;
 100                 }
 101
 102                 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
 103                         " se_dev->se_dev_group: %p\n", subsys, se_dev,
 104                         &se_dev->dev_group);
 105
 106                 mutex_unlock(&g_device_mutex);
 107                 return 0;
 108         }
 109         mutex_unlock(&g_device_mutex);
 110
 111         pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 112         return -EINVAL;
 113 }
 114
 115 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 116                                 unsigned char *p, bool src)
 117 {
 118         unsigned char *desc = p;
 119         unsigned short ript;
 120         u8 desig_len;
 121         /*
 122          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 123          */
 124         ript = get_unaligned_be16(&desc[2]);
 125         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 126         /*
 127          * Check for supported code set, association, and designator type
 128          */
 129         if ((desc[4] & 0x0f) != 0x1) {
 130                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 131                 return -EINVAL;
 132         }
 133         if ((desc[5] & 0x30) != 0x00) {
 134                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 135                 return -EINVAL;
 136         }
 137         if ((desc[5] & 0x0f) != 0x3) {
 138                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 139                                 (desc[5] & 0x0f));
 140                 return -EINVAL;
 141         }
 142         /*
 143          * Check for matching 16 byte length for NAA IEEE Registered Extended
 144          * Assigned designator
 145          */
 146         desig_len = desc[7];
 147         if (desig_len != 16) {
 148                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 149                 return -EINVAL;
 150         }
 151         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 152         /*
 153          * Check for NAA IEEE Registered Extended Assigned header..
 154          */
 155         if ((desc[8] & 0xf0) != 0x60) {
 156                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 157                                         (desc[8] & 0xf0));
 158                 return -EINVAL;
 159         }
 160
 161         if (src) {
 162                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 163                 /*
 164                  * Determine if the source designator matches the local device
 165                  */
 166                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 167                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 168                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 169                         xop->src_dev = se_cmd->se_dev;
 170                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 171                                         " received xop\n", xop->src_dev);
 172                 }
 173         } else {
 174                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 175                 /*
 176                  * Determine if the destination designator matches the local device
 177                  */
 178                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 179                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 180                         xop->op_origin = XCOL_DEST_RECV_OP;
 181                         xop->dst_dev = se_cmd->se_dev;
 182                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 183                                 " received xop\n", xop->dst_dev);
 184                 }
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 191                                 struct xcopy_op *xop, unsigned char *p,
 192                                 unsigned short tdll)
 193 {
 194         struct se_device *local_dev = se_cmd->se_dev;
 195         unsigned char *desc = p;
 196         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
 197         unsigned short start = 0;
 198         bool src = true;
 199
 200         if (offset != 0) {
 201                 pr_err("XCOPY target descriptor list length is not"
 202                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 203                 return -EINVAL;
 204         }
 205         if (tdll > 64) {
 206                 pr_err("XCOPY target descriptor supports a maximum"
 207                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 208                 return -EINVAL;
 209         }
 210         /*
 211          * Generate an IEEE Registered Extended designator based upon the
 212          * se_device the XCOPY was received upon..
 213          */
 214         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 215         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 216
 217         while (start < tdll) {
 218                 /*
 219                  * Check target descriptor identification with 0xE4 type with
 220                  * use VPD 0x83 WWPN matching ..
 221                  */
 222                 switch (desc[0]) {
 223                 case 0xe4:
 224                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 225                                                         &desc[0], src);
 226                         if (rc != 0)
 227                                 goto out;
 228                         /*
 229                          * Assume target descriptors are in source -> destination order..
 230                          */
 231                         if (src)
 232                                 src = false;
 233                         else
 234                                 src = true;
 235                         start += XCOPY_TARGET_DESC_LEN;
 236                         desc += XCOPY_TARGET_DESC_LEN;
 237                         ret++;
 238                         break;
 239                 default:
 240                         pr_err("XCOPY unsupported descriptor type code:"
 241                                         " 0x%02x\n", desc[0]);
 242                         goto out;
 243                 }
 244         }
 245
 246         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 247                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
 248         else
 249                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
 250
 251         if (rc < 0)
 252                 goto out;
 253
 254         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 255                  xop->src_dev, &xop->src_tid_wwn[0]);
 256         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 257                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 258
 259         return ret;
 260
 261 out:
 262         return -EINVAL;
 263 }
 264
 265 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 266                                         unsigned char *p)
 267 {
 268         unsigned char *desc = p;
 269         int dc = (desc[1] & 0x02);
 270         unsigned short desc_len;
 271
 272         desc_len = get_unaligned_be16(&desc[2]);
 273         if (desc_len != 0x18) {
 274                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 275                                 " %hu\n", desc_len);
 276                 return -EINVAL;
 277         }
 278
 279         xop->stdi = get_unaligned_be16(&desc[4]);
 280         xop->dtdi = get_unaligned_be16(&desc[6]);
 281         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 282                 desc_len, xop->stdi, xop->dtdi, dc);
 283
 284         xop->nolb = get_unaligned_be16(&desc[10]);
 285         xop->src_lba = get_unaligned_be64(&desc[12]);
 286         xop->dst_lba = get_unaligned_be64(&desc[20]);
 287         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 288                 xop->nolb, (unsigned long long)xop->src_lba,
 289                 (unsigned long long)xop->dst_lba);
 290
 291         if (dc != 0) {
 292                 xop->dbl = (desc[29] & 0xff) << 16;
 293                 xop->dbl |= (desc[30] & 0xff) << 8;
 294                 xop->dbl |= desc[31] & 0xff;
 295
 296                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 297         }
 298         return 0;
 299 }
 300
 301 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 302                                 struct xcopy_op *xop, unsigned char *p,
 303                                 unsigned int sdll)
 304 {
 305         unsigned char *desc = p;
 306         unsigned int start = 0;
 307         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 308
 309         if (offset != 0) {
 310                 pr_err("XCOPY segment descriptor list length is not"
 311                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 312                 return -EINVAL;
 313         }
 314
 315         while (start < sdll) {
 316                 /*
 317                  * Check segment descriptor type code for block -> block
 318                  */
 319                 switch (desc[0]) {
 320                 case 0x02:
 321                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 322                         if (rc < 0)
 323                                 goto out;
 324
 325                         ret++;
 326                         start += XCOPY_SEGMENT_DESC_LEN;
 327                         desc += XCOPY_SEGMENT_DESC_LEN;
 328                         break;
 329                 default:
 330                         pr_err("XCOPY unsupported segment descriptor"
 331                                 "type: 0x%02x\n", desc[0]);
 332                         goto out;
 333                 }
 334         }
 335
 336         return ret;
 337
 338 out:
 339         return -EINVAL;
 340 }
 341
 342 /*
 343  * Start xcopy_pt ops
 344  */
 345
 346 struct xcopy_pt_cmd {
 347         bool remote_port;
 348         struct se_cmd se_cmd;
 349         struct xcopy_op *xcopy_op;
 350         struct completion xpt_passthrough_sem;
 351         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 352 };
 353
 354 static struct se_port xcopy_pt_port;
 355 static struct se_portal_group xcopy_pt_tpg;
 356 static struct se_session xcopy_pt_sess;
 357 static struct se_node_acl xcopy_pt_nacl;
 358
 359 static char *xcopy_pt_get_fabric_name(void)
 360 {
 361         return "xcopy-pt";
 362 }
 363
 364 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
 365 {
 366         return 0;
 367 }
 368
 369 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 370 {
 371         return 0;
 372 }
 373
 374 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 375 {
 376         struct configfs_subsystem *subsys = target_core_subsystem[0];
 377         struct se_device *remote_dev;
 378
 379         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 380                 remote_dev = xop->dst_dev;
 381         else
 382                 remote_dev = xop->src_dev;
 383
 384         pr_debug("Calling configfs_undepend_item for subsys: %p"
 385                   " remote_dev: %p remote_dev->dev_group: %p\n",
 386                   subsys, remote_dev, &remote_dev->dev_group.cg_item);
 387
 388         configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
 389 }
 390
 391 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 392 {
 393         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 394                                 struct xcopy_pt_cmd, se_cmd);
 395
 396         kfree(xpt_cmd);
 397 }
 398
 399 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 400 {
 401         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 402                                 struct xcopy_pt_cmd, se_cmd);
 403
 404         complete(&xpt_cmd->xpt_passthrough_sem);
 405         return 0;
 406 }
 407
 408 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 409 {
 410         return 0;
 411 }
 412
 413 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 414 {
 415         return 0;
 416 }
 417
 418 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 419 {
 420         return 0;
 421 }
 422
 423 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 424 {
 425         return 0;
 426 }
 427
 428 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 429         .get_fabric_name        = xcopy_pt_get_fabric_name,
 430         .get_task_tag           = xcopy_pt_get_tag,
 431         .get_cmd_state          = xcopy_pt_get_cmd_state,
 432         .release_cmd            = xcopy_pt_release_cmd,
 433         .check_stop_free        = xcopy_pt_check_stop_free,
 434         .write_pending          = xcopy_pt_write_pending,
 435         .write_pending_status   = xcopy_pt_write_pending_status,
 436         .queue_data_in          = xcopy_pt_queue_data_in,
 437         .queue_status           = xcopy_pt_queue_status,
 438 };
 439
 440 /*
 441  * End xcopy_pt_ops
 442  */
 443
 444 int target_xcopy_setup_pt(void)
 445 {
 446         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 447         if (!xcopy_wq) {
 448                 pr_err("Unable to allocate xcopy_wq\n");
 449                 return -ENOMEM;
 450         }
 451
 452         memset(&xcopy_pt_port, 0, sizeof(struct se_port));
 453         INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
 454         INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
 455         mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
 456
 457         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 458         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 459         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 460         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 461
 462         xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
 463         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 464
 465         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 466         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 467         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 468         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 469         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 470         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 471
 472         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 473         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 474
 475         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 476         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 477
 478         return 0;
 479 }
 480
 481 void target_xcopy_release_pt(void)
 482 {
 483         if (xcopy_wq)
 484                 destroy_workqueue(xcopy_wq);
 485 }
 486
 487 static void target_xcopy_setup_pt_port(
 488         struct xcopy_pt_cmd *xpt_cmd,
 489         struct xcopy_op *xop,
 490         bool remote_port)
 491 {
 492         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 493         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 494
 495         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 496                 /*
 497                  * Honor destination port reservations for X-COPY PUSH emulation
 498                  * when CDB is received on local source port, and READs blocks to
 499                  * WRITE on remote destination port.
 500                  */
 501                 if (remote_port) {
 502                         xpt_cmd->remote_port = remote_port;
 503                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 504                         pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
 505                                 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
 506                                 pt_cmd->se_lun->lun_sep);
 507                 } else {
 508                         pt_cmd->se_lun = ec_cmd->se_lun;
 509                         pt_cmd->se_dev = ec_cmd->se_dev;
 510
 511                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 512                                 " %p\n", pt_cmd->se_dev);
 513                         pt_cmd->se_lun = ec_cmd->se_lun;
 514                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 515                                 pt_cmd->se_lun);
 516                 }
 517         } else {
 518                 /*
 519                  * Honor source port reservation for X-COPY PULL emulation
 520                  * when CDB is received on local desintation port, and READs
 521                  * blocks from the remote source port to WRITE on local
 522                  * destination port.
 523                  */
 524                 if (remote_port) {
 525                         xpt_cmd->remote_port = remote_port;
 526                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 527                         pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
 528                                 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
 529                                 pt_cmd->se_lun->lun_sep);
 530                 } else {
 531                         pt_cmd->se_lun = ec_cmd->se_lun;
 532                         pt_cmd->se_dev = ec_cmd->se_dev;
 533
 534                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 535                                 " %p\n", pt_cmd->se_dev);
 536                         pt_cmd->se_lun = ec_cmd->se_lun;
 537                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 538                                 pt_cmd->se_lun);
 539                 }
 540         }
 541 }
 542
 543 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 544                 struct se_cmd *pt_cmd, bool remote_port)
 545 {
 546         /*
 547          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 548          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 549          * target_xcopy_setup_pt_port()
 550          */
 551         if (remote_port) {
 552                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 553                         pt_cmd->se_dev);
 554                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 555                 pt_cmd->se_dev = se_dev;
 556         }
 557
 558         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 559 }
 560
 561 static int target_xcopy_setup_pt_cmd(
 562         struct xcopy_pt_cmd *xpt_cmd,
 563         struct xcopy_op *xop,
 564         struct se_device *se_dev,
 565         unsigned char *cdb,
 566         bool remote_port,
 567         bool alloc_mem)
 568 {
 569         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 570         sense_reason_t sense_rc;
 571         int ret = 0, rc;
 572         /*
 573          * Setup LUN+port to honor reservations based upon xop->op_origin for
 574          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 575          */
 576         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 577
 578         xpt_cmd->xcopy_op = xop;
 579         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 580
 581         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 582         if (sense_rc) {
 583                 ret = -EINVAL;
 584                 goto out;
 585         }
 586
 587         if (alloc_mem) {
 588                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 589                                       cmd->data_length, false);
 590                 if (rc < 0) {
 591                         ret = rc;
 592                         goto out;
 593                 }
 594                 /*
 595                  * Set this bit so that transport_free_pages() allows the
 596                  * caller to release SGLs + physical memory allocated by
 597                  * transport_generic_get_mem()..
 598                  */
 599                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 600         } else {
 601                 /*
 602                  * Here the previously allocated SGLs for the internal READ
 603                  * are mapped zero-copy to the internal WRITE.
 604                  */
 605                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 606                                         xop->xop_data_sg, xop->xop_data_nents,
 607                                         NULL, 0);
 608                 if (sense_rc) {
 609                         ret = -EINVAL;
 610                         goto out;
 611                 }
 612
 613                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 614                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 615         }
 616
 617         return 0;
 618
 619 out:
 620         return ret;
 621 }
 622
 623 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 624 {
 625         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 626         sense_reason_t sense_rc;
 627
 628         sense_rc = transport_generic_new_cmd(se_cmd);
 629         if (sense_rc)
 630                 return -EINVAL;
 631
 632         if (se_cmd->data_direction == DMA_TO_DEVICE)
 633                 target_execute_cmd(se_cmd);
 634
 635         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 636
 637         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 638                         se_cmd->scsi_status);
 639
 640         return (se_cmd->scsi_status) ? -EINVAL : 0;
 641 }
 642
 643 static int target_xcopy_read_source(
 644         struct se_cmd *ec_cmd,
 645         struct xcopy_op *xop,
 646         struct se_device *src_dev,
 647         sector_t src_lba,
 648         u32 src_sectors)
 649 {
 650         struct xcopy_pt_cmd *xpt_cmd;
 651         struct se_cmd *se_cmd;
 652         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 653         int rc;
 654         unsigned char cdb[16];
 655         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 656
 657         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 658         if (!xpt_cmd) {
 659                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 660                 return -ENOMEM;
 661         }
 662         init_completion(&xpt_cmd->xpt_passthrough_sem);
 663         se_cmd = &xpt_cmd->se_cmd;
 664
 665         memset(&cdb[0], 0, 16);
 666         cdb[0] = READ_16;
 667         put_unaligned_be64(src_lba, &cdb[2]);
 668         put_unaligned_be32(src_sectors, &cdb[10]);
 669         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 670                 (unsigned long long)src_lba, src_sectors, length);
 671
 672         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 673                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 674         xop->src_pt_cmd = xpt_cmd;
 675
 676         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 677                                 remote_port, true);
 678         if (rc < 0) {
 679                 transport_generic_free_cmd(se_cmd, 0);
 680                 return rc;
 681         }
 682
 683         xop->xop_data_sg = se_cmd->t_data_sg;
 684         xop->xop_data_nents = se_cmd->t_data_nents;
 685         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 686                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 687
 688         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 689         if (rc < 0) {
 690                 transport_generic_free_cmd(se_cmd, 0);
 691                 return rc;
 692         }
 693         /*
 694          * Clear off the allocated t_data_sg, that has been saved for
 695          * zero-copy WRITE submission reuse in struct xcopy_op..
 696          */
 697         se_cmd->t_data_sg = NULL;
 698         se_cmd->t_data_nents = 0;
 699
 700         return 0;
 701 }
 702
 703 static int target_xcopy_write_destination(
 704         struct se_cmd *ec_cmd,
 705         struct xcopy_op *xop,
 706         struct se_device *dst_dev,
 707         sector_t dst_lba,
 708         u32 dst_sectors)
 709 {
 710         struct xcopy_pt_cmd *xpt_cmd;
 711         struct se_cmd *se_cmd;
 712         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 713         int rc;
 714         unsigned char cdb[16];
 715         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 716
 717         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 718         if (!xpt_cmd) {
 719                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 720                 return -ENOMEM;
 721         }
 722         init_completion(&xpt_cmd->xpt_passthrough_sem);
 723         se_cmd = &xpt_cmd->se_cmd;
 724
 725         memset(&cdb[0], 0, 16);
 726         cdb[0] = WRITE_16;
 727         put_unaligned_be64(dst_lba, &cdb[2]);
 728         put_unaligned_be32(dst_sectors, &cdb[10]);
 729         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 730                 (unsigned long long)dst_lba, dst_sectors, length);
 731
 732         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 733                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 734         xop->dst_pt_cmd = xpt_cmd;
 735
 736         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 737                                 remote_port, false);
 738         if (rc < 0) {
 739                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 740                 /*
 741                  * If the failure happened before the t_mem_list hand-off in
 742                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 743                  * core releases this memory on error during X-COPY WRITE I/O.
 744                  */
 745                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 746                 src_cmd->t_data_sg = xop->xop_data_sg;
 747                 src_cmd->t_data_nents = xop->xop_data_nents;
 748
 749                 transport_generic_free_cmd(se_cmd, 0);
 750                 return rc;
 751         }
 752
 753         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 754         if (rc < 0) {
 755                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 756                 transport_generic_free_cmd(se_cmd, 0);
 757                 return rc;
 758         }
 759
 760         return 0;
 761 }
 762
 763 static void target_xcopy_do_work(struct work_struct *work)
 764 {
 765         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 766         struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
 767         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 768         sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
 769         unsigned int max_sectors;
 770         int rc;
 771         unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
 772
 773         end_lba = src_lba + nolb;
 774         /*
 775          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 776          * smallest max_sectors between src_dev + dev_dev, or
 777          */
 778         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 779                           dst_dev->dev_attrib.hw_max_sectors);
 780         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 781
 782         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 783
 784         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 785                         nolb, max_nolb, (unsigned long long)end_lba);
 786         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 787                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 788
 789         while (src_lba < end_lba) {
 790                 cur_nolb = min(nolb, max_nolb);
 791
 792                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 793                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 794
 795                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 796                 if (rc < 0)
 797                         goto out;
 798
 799                 src_lba += cur_nolb;
 800                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 801                                 (unsigned long long)src_lba);
 802
 803                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 804                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 805
 806                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 807                                                 dst_lba, cur_nolb);
 808                 if (rc < 0) {
 809                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 810                         goto out;
 811                 }
 812
 813                 dst_lba += cur_nolb;
 814                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 815                                 (unsigned long long)dst_lba);
 816
 817                 copied_nolb += cur_nolb;
 818                 nolb -= cur_nolb;
 819
 820                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 821                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 822
 823                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 824         }
 825
 826         xcopy_pt_undepend_remotedev(xop);
 827         kfree(xop);
 828
 829         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 830                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 831         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 832                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 833
 834         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 835         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 836         return;
 837
 838 out:
 839         xcopy_pt_undepend_remotedev(xop);
 840         kfree(xop);
 841
 842         pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
 843         ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 844         target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
 845 }
 846
 847 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 848 {
 849         struct se_device *dev = se_cmd->se_dev;
 850         struct xcopy_op *xop = NULL;
 851         unsigned char *p = NULL, *seg_desc;
 852         unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
 853         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 854         int rc;
 855         unsigned short tdll;
 856
 857         if (!dev->dev_attrib.emulate_3pc) {
 858                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 859                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 860         }
 861
 862         sa = se_cmd->t_task_cdb[1] & 0x1f;
 863         if (sa != 0x00) {
 864                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 865                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 866         }
 867
 868         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
 869         if (!xop) {
 870                 pr_err("Unable to allocate xcopy_op\n");
 871                 return TCM_OUT_OF_RESOURCES;
 872         }
 873         xop->xop_se_cmd = se_cmd;
 874
 875         p = transport_kmap_data_sg(se_cmd);
 876         if (!p) {
 877                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 878                 kfree(xop);
 879                 return TCM_OUT_OF_RESOURCES;
 880         }
 881
 882         list_id = p[0];
 883         list_id_usage = (p[1] & 0x18) >> 3;
 884
 885         /*
 886          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 887          */
 888         tdll = get_unaligned_be16(&p[2]);
 889         sdll = get_unaligned_be32(&p[8]);
 890
 891         inline_dl = get_unaligned_be32(&p[12]);
 892         if (inline_dl != 0) {
 893                 pr_err("XCOPY with non zero inline data length\n");
 894                 goto out;
 895         }
 896
 897         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 898                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 899                 tdll, sdll, inline_dl);
 900
 901         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
 902         if (rc <= 0)
 903                 goto out;
 904
 905         if (xop->src_dev->dev_attrib.block_size !=
 906             xop->dst_dev->dev_attrib.block_size) {
 907                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 908                        " block_size: %u currently unsupported\n",
 909                         xop->src_dev->dev_attrib.block_size,
 910                         xop->dst_dev->dev_attrib.block_size);
 911                 xcopy_pt_undepend_remotedev(xop);
 912                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 913                 goto out;
 914         }
 915
 916         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 917                                 rc * XCOPY_TARGET_DESC_LEN);
 918         seg_desc = &p[16];
 919         seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
 920
 921         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
 922         if (rc <= 0) {
 923                 xcopy_pt_undepend_remotedev(xop);
 924                 goto out;
 925         }
 926         transport_kunmap_data_sg(se_cmd);
 927
 928         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 929                                 rc * XCOPY_SEGMENT_DESC_LEN);
 930         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
 931         queue_work(xcopy_wq, &xop->xop_work);
 932         return TCM_NO_SENSE;
 933
 934 out:
 935         if (p)
 936                 transport_kunmap_data_sg(se_cmd);
 937         kfree(xop);
 938         return ret;
 939 }
 940
 941 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 942 {
 943         unsigned char *p;
 944
 945         p = transport_kmap_data_sg(se_cmd);
 946         if (!p) {
 947                 pr_err("transport_kmap_data_sg failed in"
 948                        " target_rcr_operating_parameters\n");
 949                 return TCM_OUT_OF_RESOURCES;
 950         }
 951
 952         if (se_cmd->data_length < 54) {
 953                 pr_err("Receive Copy Results Op Parameters length"
 954                        " too small: %u\n", se_cmd->data_length);
 955                 transport_kunmap_data_sg(se_cmd);
 956                 return TCM_INVALID_CDB_FIELD;
 957         }
 958         /*
 959          * Set SNLID=1 (Supports no List ID)
 960          */
 961         p[4] = 0x1;
 962         /*
 963          * MAXIMUM TARGET DESCRIPTOR COUNT
 964          */
 965         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
 966         /*
 967          * MAXIMUM SEGMENT DESCRIPTOR COUNT
 968          */
 969         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
 970         /*
 971          * MAXIMUM DESCRIPTOR LIST LENGTH
 972          */
 973         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
 974         /*
 975          * MAXIMUM SEGMENT LENGTH
 976          */
 977         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
 978         /*
 979          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
 980          */
 981         put_unaligned_be32(0x0, &p[20]);
 982         /*
 983          * HELD DATA LIMIT
 984          */
 985         put_unaligned_be32(0x0, &p[24]);
 986         /*
 987          * MAXIMUM STREAM DEVICE TRANSFER SIZE
 988          */
 989         put_unaligned_be32(0x0, &p[28]);
 990         /*
 991          * TOTAL CONCURRENT COPIES
 992          */
 993         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
 994         /*
 995          * MAXIMUM CONCURRENT COPIES
 996          */
 997         p[36] = RCR_OP_MAX_CONCURR_COPIES;
 998         /*
 999          * DATA SEGMENT GRANULARITY (log 2)
1000          */
1001         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1002         /*
1003          * INLINE DATA GRANULARITY log 2)
1004          */
1005         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1006         /*
1007          * HELD DATA GRANULARITY
1008          */
1009         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1010         /*
1011          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1012          */
1013         p[43] = 0x2;
1014         /*
1015          * List of implemented descriptor type codes (ordered)
1016          */
1017         p[44] = 0x02; /* Copy Block to Block device */
1018         p[45] = 0xe4; /* Identification descriptor target descriptor */
1019
1020         /*
1021          * AVAILABLE DATA (n-3)
1022          */
1023         put_unaligned_be32(42, &p[0]);
1024
1025         transport_kunmap_data_sg(se_cmd);
1026         target_complete_cmd(se_cmd, GOOD);
1027
1028         return TCM_NO_SENSE;
1029 }
1030
1031 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1032 {
1033         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1034         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1035         sense_reason_t rc = TCM_NO_SENSE;
1036
1037         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1038                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1039
1040         if (list_id != 0) {
1041                 pr_err("Receive Copy Results with non zero list identifier"
1042                        " not supported\n");
1043                 return TCM_INVALID_CDB_FIELD;
1044         }
1045
1046         switch (sa) {
1047         case RCR_SA_OPERATING_PARAMETERS:
1048                 rc = target_rcr_operating_parameters(se_cmd);
1049                 break;
1050         case RCR_SA_COPY_STATUS:
1051         case RCR_SA_RECEIVE_DATA:
1052         case RCR_SA_FAILED_SEGMENT_DETAILS:
1053         default:
1054                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1055                 return TCM_INVALID_CDB_FIELD;
1056         }
1057
1058         return rc;
1059 }