drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_tmr.h>
  31 #include <target/target_core_transport.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 static LIST_HEAD(g_tiqn_list);
  51 static LIST_HEAD(g_np_list);
  52 static DEFINE_SPINLOCK(tiqn_lock);
  53 static DEFINE_SPINLOCK(np_lock);
  54
  55 static struct idr tiqn_idr;
  56 struct idr sess_idr;
  57 struct mutex auth_id_lock;
  58 spinlock_t sess_idr_lock;
  59
  60 struct iscsit_global *iscsit_global;
  61
  62 struct kmem_cache *lio_cmd_cache;
  63 struct kmem_cache *lio_qr_cache;
  64 struct kmem_cache *lio_dr_cache;
  65 struct kmem_cache *lio_ooo_cache;
  66 struct kmem_cache *lio_r2t_cache;
  67
  68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  69                         unsigned char *buf, u32);
  70 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 146                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 147                 kfree(tiqn);
 148                 return ERR_PTR(-ENOMEM);
 149         }
 150         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 151
 152         spin_lock(&tiqn_lock);
 153         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 154         if (ret < 0) {
 155                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 156                 spin_unlock(&tiqn_lock);
 157                 kfree(tiqn);
 158                 return ERR_PTR(ret);
 159         }
 160         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 161         spin_unlock(&tiqn_lock);
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         if (np->np_login_tpg) {
 220                 pr_err("np->np_login_tpg() is not NULL!\n");
 221                 spin_unlock_bh(&np->np_thread_lock);
 222                 return -1;
 223         }
 224         spin_unlock_bh(&np->np_thread_lock);
 225         /*
 226          * Determine if the portal group is accepting storage traffic.
 227          */
 228         spin_lock_bh(&tpg->tpg_state_lock);
 229         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 230                 spin_unlock_bh(&tpg->tpg_state_lock);
 231                 return -1;
 232         }
 233         spin_unlock_bh(&tpg->tpg_state_lock);
 234
 235         /*
 236          * Here we serialize access across the TIQN+TPG Tuple.
 237          */
 238         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 239         if ((ret != 0) || signal_pending(current))
 240                 return -1;
 241
 242         spin_lock_bh(&np->np_thread_lock);
 243         np->np_login_tpg = tpg;
 244         spin_unlock_bh(&np->np_thread_lock);
 245
 246         return 0;
 247 }
 248
 249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 250 {
 251         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 252
 253         spin_lock_bh(&np->np_thread_lock);
 254         np->np_login_tpg = NULL;
 255         spin_unlock_bh(&np->np_thread_lock);
 256
 257         mutex_unlock(&tpg->np_login_lock);
 258
 259         if (tiqn)
 260                 iscsit_put_tiqn_for_login(tiqn);
 261
 262         return 0;
 263 }
 264
 265 static struct iscsi_np *iscsit_get_np(
 266         struct __kernel_sockaddr_storage *sockaddr,
 267         int network_transport)
 268 {
 269         struct sockaddr_in *sock_in, *sock_in_e;
 270         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 271         struct iscsi_np *np;
 272         int ip_match = 0;
 273         u16 port;
 274
 275         spin_lock_bh(&np_lock);
 276         list_for_each_entry(np, &g_np_list, np_list) {
 277                 spin_lock(&np->np_thread_lock);
 278                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 279                         spin_unlock(&np->np_thread_lock);
 280                         continue;
 281                 }
 282
 283                 if (sockaddr->ss_family == AF_INET6) {
 284                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                         if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
 288                                     (void *)&sock_in6_e->sin6_addr.in6_u,
 289                                     sizeof(struct in6_addr)))
 290                                 ip_match = 1;
 291
 292                         port = ntohs(sock_in6->sin6_port);
 293                 } else {
 294                         sock_in = (struct sockaddr_in *)sockaddr;
 295                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                         if (sock_in->sin_addr.s_addr ==
 298                             sock_in_e->sin_addr.s_addr)
 299                                 ip_match = 1;
 300
 301                         port = ntohs(sock_in->sin_port);
 302                 }
 303
 304                 if ((ip_match == 1) && (np->np_port == port) &&
 305                     (np->np_network_transport == network_transport)) {
 306                         /*
 307                          * Increment the np_exports reference count now to
 308                          * prevent iscsit_del_np() below from being called
 309                          * while iscsi_tpg_add_network_portal() is called.
 310                          */
 311                         np->np_exports++;
 312                         spin_unlock(&np->np_thread_lock);
 313                         spin_unlock_bh(&np_lock);
 314                         return np;
 315                 }
 316                 spin_unlock(&np->np_thread_lock);
 317         }
 318         spin_unlock_bh(&np_lock);
 319
 320         return NULL;
 321 }
 322
 323 struct iscsi_np *iscsit_add_np(
 324         struct __kernel_sockaddr_storage *sockaddr,
 325         char *ip_str,
 326         int network_transport)
 327 {
 328         struct sockaddr_in *sock_in;
 329         struct sockaddr_in6 *sock_in6;
 330         struct iscsi_np *np;
 331         int ret;
 332         /*
 333          * Locate the existing struct iscsi_np if already active..
 334          */
 335         np = iscsit_get_np(sockaddr, network_transport);
 336         if (np)
 337                 return np;
 338
 339         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 340         if (!np) {
 341                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 342                 return ERR_PTR(-ENOMEM);
 343         }
 344
 345         np->np_flags |= NPF_IP_NETWORK;
 346         if (sockaddr->ss_family == AF_INET6) {
 347                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 348                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 349                 np->np_port = ntohs(sock_in6->sin6_port);
 350         } else {
 351                 sock_in = (struct sockaddr_in *)sockaddr;
 352                 sprintf(np->np_ip, "%s", ip_str);
 353                 np->np_port = ntohs(sock_in->sin_port);
 354         }
 355
 356         np->np_network_transport = network_transport;
 357         spin_lock_init(&np->np_thread_lock);
 358         init_completion(&np->np_restart_comp);
 359         INIT_LIST_HEAD(&np->np_list);
 360
 361         ret = iscsi_target_setup_login_socket(np, sockaddr);
 362         if (ret != 0) {
 363                 kfree(np);
 364                 return ERR_PTR(ret);
 365         }
 366
 367         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 368         if (IS_ERR(np->np_thread)) {
 369                 pr_err("Unable to create kthread: iscsi_np\n");
 370                 ret = PTR_ERR(np->np_thread);
 371                 kfree(np);
 372                 return ERR_PTR(ret);
 373         }
 374         /*
 375          * Increment the np_exports reference count now to prevent
 376          * iscsit_del_np() below from being run while a new call to
 377          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 378          * active.  We don't need to hold np->np_thread_lock at this
 379          * point because iscsi_np has not been added to g_np_list yet.
 380          */
 381         np->np_exports = 1;
 382
 383         spin_lock_bh(&np_lock);
 384         list_add_tail(&np->np_list, &g_np_list);
 385         spin_unlock_bh(&np_lock);
 386
 387         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 388                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 389                 "TCP" : "SCTP");
 390
 391         return np;
 392 }
 393
 394 int iscsit_reset_np_thread(
 395         struct iscsi_np *np,
 396         struct iscsi_tpg_np *tpg_np,
 397         struct iscsi_portal_group *tpg)
 398 {
 399         spin_lock_bh(&np->np_thread_lock);
 400         if (tpg && tpg_np) {
 401                 /*
 402                  * The reset operation need only be performed when the
 403                  * passed struct iscsi_portal_group has a login in progress
 404                  * to one of the network portals.
 405                  */
 406                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 407                         spin_unlock_bh(&np->np_thread_lock);
 408                         return 0;
 409                 }
 410         }
 411         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 412                 spin_unlock_bh(&np->np_thread_lock);
 413                 return 0;
 414         }
 415         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 416
 417         if (np->np_thread) {
 418                 spin_unlock_bh(&np->np_thread_lock);
 419                 send_sig(SIGINT, np->np_thread, 1);
 420                 wait_for_completion(&np->np_restart_comp);
 421                 spin_lock_bh(&np->np_thread_lock);
 422         }
 423         spin_unlock_bh(&np->np_thread_lock);
 424
 425         return 0;
 426 }
 427
 428 int iscsit_del_np_comm(struct iscsi_np *np)
 429 {
 430         if (!np->np_socket)
 431                 return 0;
 432
 433         /*
 434          * Some network transports allocate their own struct sock->file,
 435          * see  if we need to free any additional allocated resources.
 436          */
 437         if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
 438                 kfree(np->np_socket->file);
 439                 np->np_socket->file = NULL;
 440         }
 441
 442         sock_release(np->np_socket);
 443         return 0;
 444 }
 445
 446 int iscsit_del_np(struct iscsi_np *np)
 447 {
 448         spin_lock_bh(&np->np_thread_lock);
 449         np->np_exports--;
 450         if (np->np_exports) {
 451                 spin_unlock_bh(&np->np_thread_lock);
 452                 return 0;
 453         }
 454         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 455         spin_unlock_bh(&np->np_thread_lock);
 456
 457         if (np->np_thread) {
 458                 /*
 459                  * We need to send the signal to wakeup Linux/Net
 460                  * which may be sleeping in sock_accept()..
 461                  */
 462                 send_sig(SIGINT, np->np_thread, 1);
 463                 kthread_stop(np->np_thread);
 464         }
 465         iscsit_del_np_comm(np);
 466
 467         spin_lock_bh(&np_lock);
 468         list_del(&np->np_list);
 469         spin_unlock_bh(&np_lock);
 470
 471         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 472                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 473                 "TCP" : "SCTP");
 474
 475         kfree(np);
 476         return 0;
 477 }
 478
 479 static int __init iscsi_target_init_module(void)
 480 {
 481         int ret = 0;
 482
 483         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 484
 485         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 486         if (!iscsit_global) {
 487                 pr_err("Unable to allocate memory for iscsit_global\n");
 488                 return -1;
 489         }
 490         mutex_init(&auth_id_lock);
 491         spin_lock_init(&sess_idr_lock);
 492         idr_init(&tiqn_idr);
 493         idr_init(&sess_idr);
 494
 495         ret = iscsi_target_register_configfs();
 496         if (ret < 0)
 497                 goto out;
 498
 499         ret = iscsi_thread_set_init();
 500         if (ret < 0)
 501                 goto configfs_out;
 502
 503         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 504                         TARGET_THREAD_SET_COUNT) {
 505                 pr_err("iscsi_allocate_thread_sets() returned"
 506                         " unexpected value!\n");
 507                 goto ts_out1;
 508         }
 509
 510         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 511                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 512                         0, NULL);
 513         if (!lio_cmd_cache) {
 514                 pr_err("Unable to kmem_cache_create() for"
 515                                 " lio_cmd_cache\n");
 516                 goto ts_out2;
 517         }
 518
 519         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 520                         sizeof(struct iscsi_queue_req),
 521                         __alignof__(struct iscsi_queue_req), 0, NULL);
 522         if (!lio_qr_cache) {
 523                 pr_err("nable to kmem_cache_create() for"
 524                                 " lio_qr_cache\n");
 525                 goto cmd_out;
 526         }
 527
 528         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 529                         sizeof(struct iscsi_datain_req),
 530                         __alignof__(struct iscsi_datain_req), 0, NULL);
 531         if (!lio_dr_cache) {
 532                 pr_err("Unable to kmem_cache_create() for"
 533                                 " lio_dr_cache\n");
 534                 goto qr_out;
 535         }
 536
 537         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 538                         sizeof(struct iscsi_ooo_cmdsn),
 539                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 540         if (!lio_ooo_cache) {
 541                 pr_err("Unable to kmem_cache_create() for"
 542                                 " lio_ooo_cache\n");
 543                 goto dr_out;
 544         }
 545
 546         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 547                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 548                         0, NULL);
 549         if (!lio_r2t_cache) {
 550                 pr_err("Unable to kmem_cache_create() for"
 551                                 " lio_r2t_cache\n");
 552                 goto ooo_out;
 553         }
 554
 555         if (iscsit_load_discovery_tpg() < 0)
 556                 goto r2t_out;
 557
 558         return ret;
 559 r2t_out:
 560         kmem_cache_destroy(lio_r2t_cache);
 561 ooo_out:
 562         kmem_cache_destroy(lio_ooo_cache);
 563 dr_out:
 564         kmem_cache_destroy(lio_dr_cache);
 565 qr_out:
 566         kmem_cache_destroy(lio_qr_cache);
 567 cmd_out:
 568         kmem_cache_destroy(lio_cmd_cache);
 569 ts_out2:
 570         iscsi_deallocate_thread_sets();
 571 ts_out1:
 572         iscsi_thread_set_free();
 573 configfs_out:
 574         iscsi_target_deregister_configfs();
 575 out:
 576         kfree(iscsit_global);
 577         return -ENOMEM;
 578 }
 579
 580 static void __exit iscsi_target_cleanup_module(void)
 581 {
 582         iscsi_deallocate_thread_sets();
 583         iscsi_thread_set_free();
 584         iscsit_release_discovery_tpg();
 585         kmem_cache_destroy(lio_cmd_cache);
 586         kmem_cache_destroy(lio_qr_cache);
 587         kmem_cache_destroy(lio_dr_cache);
 588         kmem_cache_destroy(lio_ooo_cache);
 589         kmem_cache_destroy(lio_r2t_cache);
 590
 591         iscsi_target_deregister_configfs();
 592
 593         kfree(iscsit_global);
 594 }
 595
 596 int iscsit_add_reject(
 597         u8 reason,
 598         int fail_conn,
 599         unsigned char *buf,
 600         struct iscsi_conn *conn)
 601 {
 602         struct iscsi_cmd *cmd;
 603         struct iscsi_reject *hdr;
 604         int ret;
 605
 606         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 607         if (!cmd)
 608                 return -1;
 609
 610         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 611         if (fail_conn)
 612                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 613
 614         hdr     = (struct iscsi_reject *) cmd->pdu;
 615         hdr->reason = reason;
 616
 617         cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
 618         if (!cmd->buf_ptr) {
 619                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 620                 iscsit_release_cmd(cmd);
 621                 return -1;
 622         }
 623         memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
 624
 625         spin_lock_bh(&conn->cmd_lock);
 626         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 627         spin_unlock_bh(&conn->cmd_lock);
 628
 629         cmd->i_state = ISTATE_SEND_REJECT;
 630         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 631
 632         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 633         if (ret != 0)
 634                 return -1;
 635
 636         return (!fail_conn) ? 0 : -1;
 637 }
 638
 639 int iscsit_add_reject_from_cmd(
 640         u8 reason,
 641         int fail_conn,
 642         int add_to_conn,
 643         unsigned char *buf,
 644         struct iscsi_cmd *cmd)
 645 {
 646         struct iscsi_conn *conn;
 647         struct iscsi_reject *hdr;
 648         int ret;
 649
 650         if (!cmd->conn) {
 651                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 652                                 cmd->init_task_tag);
 653                 return -1;
 654         }
 655         conn = cmd->conn;
 656
 657         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 658         if (fail_conn)
 659                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 660
 661         hdr     = (struct iscsi_reject *) cmd->pdu;
 662         hdr->reason = reason;
 663
 664         cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
 665         if (!cmd->buf_ptr) {
 666                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 667                 iscsit_release_cmd(cmd);
 668                 return -1;
 669         }
 670         memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
 671
 672         if (add_to_conn) {
 673                 spin_lock_bh(&conn->cmd_lock);
 674                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 675                 spin_unlock_bh(&conn->cmd_lock);
 676         }
 677
 678         cmd->i_state = ISTATE_SEND_REJECT;
 679         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 680
 681         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 682         if (ret != 0)
 683                 return -1;
 684
 685         return (!fail_conn) ? 0 : -1;
 686 }
 687
 688 /*
 689  * Map some portion of the allocated scatterlist to an iovec, suitable for
 690  * kernel sockets to copy data in/out. This handles both pages and slab-allocated
 691  * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
 692  * either case (see iscsit_alloc_buffs)
 693  */
 694 static int iscsit_map_iovec(
 695         struct iscsi_cmd *cmd,
 696         struct kvec *iov,
 697         u32 data_offset,
 698         u32 data_length)
 699 {
 700         u32 i = 0;
 701         struct scatterlist *sg;
 702         unsigned int page_off;
 703
 704         /*
 705          * We have a private mapping of the allocated pages in t_mem_sg.
 706          * At this point, we also know each contains a page.
 707          */
 708         sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
 709         page_off = (data_offset % PAGE_SIZE);
 710
 711         cmd->first_data_sg = sg;
 712         cmd->first_data_sg_off = page_off;
 713
 714         while (data_length) {
 715                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 716
 717                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 718                 iov[i].iov_len = cur_len;
 719
 720                 data_length -= cur_len;
 721                 page_off = 0;
 722                 sg = sg_next(sg);
 723                 i++;
 724         }
 725
 726         cmd->kmapped_nents = i;
 727
 728         return i;
 729 }
 730
 731 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 732 {
 733         u32 i;
 734         struct scatterlist *sg;
 735
 736         sg = cmd->first_data_sg;
 737
 738         for (i = 0; i < cmd->kmapped_nents; i++)
 739                 kunmap(sg_page(&sg[i]));
 740 }
 741
 742 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 743 {
 744         struct iscsi_cmd *cmd;
 745
 746         conn->exp_statsn = exp_statsn;
 747
 748         spin_lock_bh(&conn->cmd_lock);
 749         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
 750                 spin_lock(&cmd->istate_lock);
 751                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 752                     (cmd->stat_sn < exp_statsn)) {
 753                         cmd->i_state = ISTATE_REMOVE;
 754                         spin_unlock(&cmd->istate_lock);
 755                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 756                                                 cmd->i_state);
 757                         continue;
 758                 }
 759                 spin_unlock(&cmd->istate_lock);
 760         }
 761         spin_unlock_bh(&conn->cmd_lock);
 762 }
 763
 764 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 765 {
 766         u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
 767                                 cmd->se_cmd.t_data_nents;
 768
 769         iov_count += ISCSI_IOV_DATA_BUFFER;
 770
 771         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 772         if (!cmd->iov_data) {
 773                 pr_err("Unable to allocate cmd->iov_data\n");
 774                 return -ENOMEM;
 775         }
 776
 777         cmd->orig_iov_data_count = iov_count;
 778         return 0;
 779 }
 780
 781 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
 782 {
 783         struct scatterlist *sgl;
 784         u32 length = cmd->se_cmd.data_length;
 785         int nents = DIV_ROUND_UP(length, PAGE_SIZE);
 786         int i = 0, ret;
 787         /*
 788          * If no SCSI payload is present, allocate the default iovecs used for
 789          * iSCSI PDU Header
 790          */
 791         if (!length)
 792                 return iscsit_allocate_iovecs(cmd);
 793
 794         sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
 795         if (!sgl)
 796                 return -ENOMEM;
 797
 798         sg_init_table(sgl, nents);
 799
 800         while (length) {
 801                 int buf_size = min_t(int, length, PAGE_SIZE);
 802                 struct page *page;
 803
 804                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 805                 if (!page)
 806                         goto page_alloc_failed;
 807
 808                 sg_set_page(&sgl[i], page, buf_size, 0);
 809
 810                 length -= buf_size;
 811                 i++;
 812         }
 813
 814         cmd->t_mem_sg = sgl;
 815         cmd->t_mem_sg_nents = nents;
 816
 817         /* BIDI ops not supported */
 818
 819         /* Tell the core about our preallocated memory */
 820         transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
 821         /*
 822          * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
 823          * so that cmd->se_cmd.t_tasks_se_num has been set.
 824          */
 825         ret = iscsit_allocate_iovecs(cmd);
 826         if (ret < 0)
 827                 goto page_alloc_failed;
 828
 829         return 0;
 830
 831 page_alloc_failed:
 832         while (i >= 0) {
 833                 __free_page(sg_page(&sgl[i]));
 834                 i--;
 835         }
 836         kfree(cmd->t_mem_sg);
 837         cmd->t_mem_sg = NULL;
 838         return -ENOMEM;
 839 }
 840
 841 static int iscsit_handle_scsi_cmd(
 842         struct iscsi_conn *conn,
 843         unsigned char *buf)
 844 {
 845         int     data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
 846         int     dump_immediate_data = 0, send_check_condition = 0, payload_length;
 847         struct iscsi_cmd        *cmd = NULL;
 848         struct iscsi_scsi_req *hdr;
 849
 850         spin_lock_bh(&conn->sess->session_stats_lock);
 851         conn->sess->cmd_pdus++;
 852         if (conn->sess->se_sess->se_node_acl) {
 853                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 854                 conn->sess->se_sess->se_node_acl->num_cmds++;
 855                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 856         }
 857         spin_unlock_bh(&conn->sess->session_stats_lock);
 858
 859         hdr                     = (struct iscsi_scsi_req *) buf;
 860         payload_length          = ntoh24(hdr->dlength);
 861         hdr->itt                = be32_to_cpu(hdr->itt);
 862         hdr->data_length        = be32_to_cpu(hdr->data_length);
 863         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
 864         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
 865
 866         /* FIXME; Add checks for AdditionalHeaderSegment */
 867
 868         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 869             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 870                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 871                                 " not set. Bad iSCSI Initiator.\n");
 872                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 873                                 buf, conn);
 874         }
 875
 876         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 877              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 878                 /*
 879                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 880                  * that adds support for RESERVE/RELEASE.  There is a bug
 881                  * add with this new functionality that sets R/W bits when
 882                  * neither CDB carries any READ or WRITE datapayloads.
 883                  */
 884                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 885                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 886                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 887                         goto done;
 888                 }
 889
 890                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 891                         " set when Expected Data Transfer Length is 0 for"
 892                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 893                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 894                                 buf, conn);
 895         }
 896 done:
 897
 898         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 899             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 900                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 901                         " MUST be set if Expected Data Transfer Length is not 0."
 902                         " Bad iSCSI Initiator\n");
 903                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 904                                 buf, conn);
 905         }
 906
 907         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 908             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 909                 pr_err("Bidirectional operations not supported!\n");
 910                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 911                                 buf, conn);
 912         }
 913
 914         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 915                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 916                                 " Scsi Command PDU.\n");
 917                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 918                                 buf, conn);
 919         }
 920
 921         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 922                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 923                         " protocol error.\n", payload_length);
 924                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 925                                 buf, conn);
 926         }
 927
 928         if ((hdr->data_length == payload_length) &&
 929             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 930                 pr_err("Expected Data Transfer Length and Length of"
 931                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 932                         " bit is not set protocol error\n");
 933                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 934                                 buf, conn);
 935         }
 936
 937         if (payload_length > hdr->data_length) {
 938                 pr_err("DataSegmentLength: %u is greater than"
 939                         " EDTL: %u, protocol error.\n", payload_length,
 940                                 hdr->data_length);
 941                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 942                                 buf, conn);
 943         }
 944
 945         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
 946                 pr_err("DataSegmentLength: %u is greater than"
 947                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 948                         payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
 949                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 950                                 buf, conn);
 951         }
 952
 953         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 954                 pr_err("DataSegmentLength: %u is greater than"
 955                         " FirstBurstLength: %u, protocol error.\n",
 956                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 957                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 958                                         buf, conn);
 959         }
 960
 961         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 962                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 963                           DMA_NONE;
 964
 965         cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
 966                                 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
 967         if (!cmd)
 968                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 969                                         buf, conn);
 970
 971         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 972                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 973                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 974
 975         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 976         cmd->i_state            = ISTATE_NEW_CMD;
 977         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 978         cmd->immediate_data     = (payload_length) ? 1 : 0;
 979         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 980                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 981         if (cmd->unsolicited_data)
 982                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 983
 984         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 985         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 986                 spin_lock_bh(&conn->sess->ttt_lock);
 987                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 988                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 989                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 990                 spin_unlock_bh(&conn->sess->ttt_lock);
 991         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 992                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 993         cmd->cmd_sn             = hdr->cmdsn;
 994         cmd->exp_stat_sn        = hdr->exp_statsn;
 995         cmd->first_burst_len    = payload_length;
 996
 997         if (cmd->data_direction == DMA_FROM_DEVICE) {
 998                 struct iscsi_datain_req *dr;
 999
1000                 dr = iscsit_allocate_datain_req();
1001                 if (!dr)
1002                         return iscsit_add_reject_from_cmd(
1003                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1004                                         1, 1, buf, cmd);
1005
1006                 iscsit_attach_datain_req(cmd, dr);
1007         }
1008
1009         /*
1010          * The CDB is going to an se_device_t.
1011          */
1012         ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1013                                 get_unaligned_le64(&hdr->lun));
1014         if (ret < 0) {
1015                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1016                         pr_debug("Responding to non-acl'ed,"
1017                                 " non-existent or non-exported iSCSI LUN:"
1018                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1019                 }
1020                 if (ret == PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES)
1021                         return iscsit_add_reject_from_cmd(
1022                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1023                                         1, 1, buf, cmd);
1024
1025                 send_check_condition = 1;
1026                 goto attach_cmd;
1027         }
1028         /*
1029          * The Initiator Node has access to the LUN (the addressing method
1030          * is handled inside of iscsit_get_lun_for_cmd()).  Now it's time to
1031          * allocate 1->N transport tasks (depending on sector count and
1032          * maximum request size the physical HBA(s) can handle.
1033          */
1034         transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1035         if (transport_ret == -ENOMEM) {
1036                 return iscsit_add_reject_from_cmd(
1037                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1038                                 1, 1, buf, cmd);
1039         } else if (transport_ret == -EINVAL) {
1040                 /*
1041                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
1042                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
1043                  * Mechinism.
1044                  */
1045                 send_check_condition = 1;
1046         } else {
1047                 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1048                         return iscsit_add_reject_from_cmd(
1049                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1050                                 1, 1, buf, cmd);
1051         }
1052
1053 attach_cmd:
1054         spin_lock_bh(&conn->cmd_lock);
1055         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1056         spin_unlock_bh(&conn->cmd_lock);
1057         /*
1058          * Check if we need to delay processing because of ALUA
1059          * Active/NonOptimized primary access state..
1060          */
1061         core_alua_check_nonop_delay(&cmd->se_cmd);
1062         /*
1063          * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1064          * also call iscsit_allocate_iovecs()
1065          */
1066         ret = iscsit_alloc_buffs(cmd);
1067         if (ret < 0)
1068                 return iscsit_add_reject_from_cmd(
1069                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1070                                 1, 1, buf, cmd);
1071         /*
1072          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1073          * the Immediate Bit is not set, and no Immediate
1074          * Data is attached.
1075          *
1076          * A PDU/CmdSN carrying Immediate Data can only
1077          * be processed after the DataCRC has passed.
1078          * If the DataCRC fails, the CmdSN MUST NOT
1079          * be acknowledged. (See below)
1080          */
1081         if (!cmd->immediate_data) {
1082                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1083                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1084                         return 0;
1085                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1086                         return iscsit_add_reject_from_cmd(
1087                                 ISCSI_REASON_PROTOCOL_ERROR,
1088                                 1, 0, buf, cmd);
1089         }
1090
1091         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1092
1093         /*
1094          * If no Immediate Data is attached, it's OK to return now.
1095          */
1096         if (!cmd->immediate_data) {
1097                 if (send_check_condition)
1098                         return 0;
1099
1100                 if (cmd->unsolicited_data) {
1101                         iscsit_set_dataout_sequence_values(cmd);
1102
1103                         spin_lock_bh(&cmd->dataout_timeout_lock);
1104                         iscsit_start_dataout_timer(cmd, cmd->conn);
1105                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1106                 }
1107
1108                 return 0;
1109         }
1110
1111         /*
1112          * Early CHECK_CONDITIONs never make it to the transport processing
1113          * thread.  They are processed in CmdSN order by
1114          * iscsit_check_received_cmdsn() below.
1115          */
1116         if (send_check_condition) {
1117                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1118                 dump_immediate_data = 1;
1119                 goto after_immediate_data;
1120         }
1121         /*
1122          * Call directly into transport_generic_new_cmd() to perform
1123          * the backend memory allocation.
1124          */
1125         ret = transport_generic_new_cmd(&cmd->se_cmd);
1126         if ((ret < 0) || (cmd->se_cmd.se_cmd_flags & SCF_SE_CMD_FAILED)) {
1127                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1128                 dump_immediate_data = 1;
1129                 goto after_immediate_data;
1130         }
1131
1132         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1133 after_immediate_data:
1134         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1135                 /*
1136                  * A PDU/CmdSN carrying Immediate Data passed
1137                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1138                  * Immediate Bit is not set.
1139                  */
1140                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1141                 /*
1142                  * Special case for Unsupported SAM WRITE Opcodes
1143                  * and ImmediateData=Yes.
1144                  */
1145                 if (dump_immediate_data) {
1146                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1147                                 return -1;
1148                 } else if (cmd->unsolicited_data) {
1149                         iscsit_set_dataout_sequence_values(cmd);
1150
1151                         spin_lock_bh(&cmd->dataout_timeout_lock);
1152                         iscsit_start_dataout_timer(cmd, cmd->conn);
1153                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1154                 }
1155
1156                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1157                         return iscsit_add_reject_from_cmd(
1158                                 ISCSI_REASON_PROTOCOL_ERROR,
1159                                 1, 0, buf, cmd);
1160
1161         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1162                 /*
1163                  * Immediate Data failed DataCRC and ERL>=1,
1164                  * silently drop this PDU and let the initiator
1165                  * plug the CmdSN gap.
1166                  *
1167                  * FIXME: Send Unsolicited NOPIN with reserved
1168                  * TTT here to help the initiator figure out
1169                  * the missing CmdSN, although they should be
1170                  * intelligent enough to determine the missing
1171                  * CmdSN and issue a retry to plug the sequence.
1172                  */
1173                 cmd->i_state = ISTATE_REMOVE;
1174                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1175         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1176                 return -1;
1177
1178         return 0;
1179 }
1180
1181 static u32 iscsit_do_crypto_hash_sg(
1182         struct hash_desc *hash,
1183         struct iscsi_cmd *cmd,
1184         u32 data_offset,
1185         u32 data_length,
1186         u32 padding,
1187         u8 *pad_bytes)
1188 {
1189         u32 data_crc;
1190         u32 i;
1191         struct scatterlist *sg;
1192         unsigned int page_off;
1193
1194         crypto_hash_init(hash);
1195
1196         sg = cmd->first_data_sg;
1197         page_off = cmd->first_data_sg_off;
1198
1199         i = 0;
1200         while (data_length) {
1201                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1202
1203                 crypto_hash_update(hash, &sg[i], cur_len);
1204
1205                 data_length -= cur_len;
1206                 page_off = 0;
1207                 i++;
1208         }
1209
1210         if (padding) {
1211                 struct scatterlist pad_sg;
1212
1213                 sg_init_one(&pad_sg, pad_bytes, padding);
1214                 crypto_hash_update(hash, &pad_sg, padding);
1215         }
1216         crypto_hash_final(hash, (u8 *) &data_crc);
1217
1218         return data_crc;
1219 }
1220
1221 static void iscsit_do_crypto_hash_buf(
1222         struct hash_desc *hash,
1223         unsigned char *buf,
1224         u32 payload_length,
1225         u32 padding,
1226         u8 *pad_bytes,
1227         u8 *data_crc)
1228 {
1229         struct scatterlist sg;
1230
1231         crypto_hash_init(hash);
1232
1233         sg_init_one(&sg, (u8 *)buf, payload_length);
1234         crypto_hash_update(hash, &sg, payload_length);
1235
1236         if (padding) {
1237                 sg_init_one(&sg, pad_bytes, padding);
1238                 crypto_hash_update(hash, &sg, padding);
1239         }
1240         crypto_hash_final(hash, data_crc);
1241 }
1242
1243 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1244 {
1245         int iov_ret, ooo_cmdsn = 0, ret;
1246         u8 data_crc_failed = 0;
1247         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1248         u32 rx_size = 0, payload_length;
1249         struct iscsi_cmd *cmd = NULL;
1250         struct se_cmd *se_cmd;
1251         struct iscsi_data *hdr;
1252         struct kvec *iov;
1253         unsigned long flags;
1254
1255         hdr                     = (struct iscsi_data *) buf;
1256         payload_length          = ntoh24(hdr->dlength);
1257         hdr->itt                = be32_to_cpu(hdr->itt);
1258         hdr->ttt                = be32_to_cpu(hdr->ttt);
1259         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1260         hdr->datasn             = be32_to_cpu(hdr->datasn);
1261         hdr->offset             = be32_to_cpu(hdr->offset);
1262
1263         if (!payload_length) {
1264                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1265                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1266                                         buf, conn);
1267         }
1268
1269         /* iSCSI write */
1270         spin_lock_bh(&conn->sess->session_stats_lock);
1271         conn->sess->rx_data_octets += payload_length;
1272         if (conn->sess->se_sess->se_node_acl) {
1273                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1274                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1275                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1276         }
1277         spin_unlock_bh(&conn->sess->session_stats_lock);
1278
1279         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1280                 pr_err("DataSegmentLength: %u is greater than"
1281                         " MaxRecvDataSegmentLength: %u\n", payload_length,
1282                         conn->conn_ops->MaxRecvDataSegmentLength);
1283                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1284                                         buf, conn);
1285         }
1286
1287         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1288                         payload_length);
1289         if (!cmd)
1290                 return 0;
1291
1292         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1293                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1294                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1295                 payload_length, conn->cid);
1296
1297         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1298                 pr_err("Command ITT: 0x%08x received DataOUT after"
1299                         " last DataOUT received, dumping payload\n",
1300                         cmd->init_task_tag);
1301                 return iscsit_dump_data_payload(conn, payload_length, 1);
1302         }
1303
1304         if (cmd->data_direction != DMA_TO_DEVICE) {
1305                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1306                         " NON-WRITE command.\n", cmd->init_task_tag);
1307                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1308                                 1, 0, buf, cmd);
1309         }
1310         se_cmd = &cmd->se_cmd;
1311         iscsit_mod_dataout_timer(cmd);
1312
1313         if ((hdr->offset + payload_length) > cmd->data_length) {
1314                 pr_err("DataOut Offset: %u, Length %u greater than"
1315                         " iSCSI Command EDTL %u, protocol error.\n",
1316                         hdr->offset, payload_length, cmd->data_length);
1317                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1318                                 1, 0, buf, cmd);
1319         }
1320
1321         if (cmd->unsolicited_data) {
1322                 int dump_unsolicited_data = 0;
1323
1324                 if (conn->sess->sess_ops->InitialR2T) {
1325                         pr_err("Received unexpected unsolicited data"
1326                                 " while InitialR2T=Yes, protocol error.\n");
1327                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1328                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1329                         return -1;
1330                 }
1331                 /*
1332                  * Special case for dealing with Unsolicited DataOUT
1333                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1334                  * failures;
1335                  */
1336
1337                 /* Something's amiss if we're not in WRITE_PENDING state... */
1338                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1339                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1340                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1341
1342                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1343                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1344                      (se_cmd->se_cmd_flags & SCF_SE_CMD_FAILED))
1345                         dump_unsolicited_data = 1;
1346                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1347
1348                 if (dump_unsolicited_data) {
1349                         /*
1350                          * Check if a delayed TASK_ABORTED status needs to
1351                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1352                          * received with the unsolicitied data out.
1353                          */
1354                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1355                                 iscsit_stop_dataout_timer(cmd);
1356
1357                         transport_check_aborted_status(se_cmd,
1358                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1359                         return iscsit_dump_data_payload(conn, payload_length, 1);
1360                 }
1361         } else {
1362                 /*
1363                  * For the normal solicited data path:
1364                  *
1365                  * Check for a delayed TASK_ABORTED status and dump any
1366                  * incoming data out payload if one exists.  Also, when the
1367                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1368                  * data out sequence, we decrement outstanding_r2ts.  Once
1369                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1370                  * TASK_ABORTED status.
1371                  */
1372                 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1373                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1374                                 if (--cmd->outstanding_r2ts < 1) {
1375                                         iscsit_stop_dataout_timer(cmd);
1376                                         transport_check_aborted_status(
1377                                                         se_cmd, 1);
1378                                 }
1379
1380                         return iscsit_dump_data_payload(conn, payload_length, 1);
1381                 }
1382         }
1383         /*
1384          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1385          * within-command recovery checks before receiving the payload.
1386          */
1387         ret = iscsit_check_pre_dataout(cmd, buf);
1388         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1389                 return 0;
1390         else if (ret == DATAOUT_CANNOT_RECOVER)
1391                 return -1;
1392
1393         rx_size += payload_length;
1394         iov = &cmd->iov_data[0];
1395
1396         iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1397         if (iov_ret < 0)
1398                 return -1;
1399
1400         iov_count += iov_ret;
1401
1402         padding = ((-payload_length) & 3);
1403         if (padding != 0) {
1404                 iov[iov_count].iov_base = cmd->pad_bytes;
1405                 iov[iov_count++].iov_len = padding;
1406                 rx_size += padding;
1407                 pr_debug("Receiving %u padding bytes.\n", padding);
1408         }
1409
1410         if (conn->conn_ops->DataDigest) {
1411                 iov[iov_count].iov_base = &checksum;
1412                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1413                 rx_size += ISCSI_CRC_LEN;
1414         }
1415
1416         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1417
1418         iscsit_unmap_iovec(cmd);
1419
1420         if (rx_got != rx_size)
1421                 return -1;
1422
1423         if (conn->conn_ops->DataDigest) {
1424                 u32 data_crc;
1425
1426                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1427                                                     hdr->offset, payload_length, padding,
1428                                                     cmd->pad_bytes);
1429
1430                 if (checksum != data_crc) {
1431                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1432                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1433                                 " does not match computed 0x%08x\n",
1434                                 hdr->itt, hdr->offset, payload_length,
1435                                 hdr->datasn, checksum, data_crc);
1436                         data_crc_failed = 1;
1437                 } else {
1438                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1439                                 " %u bytes of Data Out\n", checksum,
1440                                 payload_length);
1441                 }
1442         }
1443         /*
1444          * Increment post receive data and CRC values or perform
1445          * within-command recovery.
1446          */
1447         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1448         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1449                 return 0;
1450         else if (ret == DATAOUT_SEND_R2T) {
1451                 iscsit_set_dataout_sequence_values(cmd);
1452                 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1453         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1454                 /*
1455                  * Handle extra special case for out of order
1456                  * Unsolicited Data Out.
1457                  */
1458                 spin_lock_bh(&cmd->istate_lock);
1459                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1460                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1461                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1462                 spin_unlock_bh(&cmd->istate_lock);
1463
1464                 iscsit_stop_dataout_timer(cmd);
1465                 return (!ooo_cmdsn) ? transport_generic_handle_data(
1466                                         &cmd->se_cmd) : 0;
1467         } else /* DATAOUT_CANNOT_RECOVER */
1468                 return -1;
1469
1470         return 0;
1471 }
1472
1473 static int iscsit_handle_nop_out(
1474         struct iscsi_conn *conn,
1475         unsigned char *buf)
1476 {
1477         unsigned char *ping_data = NULL;
1478         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1479         u32 checksum, data_crc, padding = 0, payload_length;
1480         u64 lun;
1481         struct iscsi_cmd *cmd = NULL;
1482         struct kvec *iov = NULL;
1483         struct iscsi_nopout *hdr;
1484
1485         hdr                     = (struct iscsi_nopout *) buf;
1486         payload_length          = ntoh24(hdr->dlength);
1487         lun                     = get_unaligned_le64(&hdr->lun);
1488         hdr->itt                = be32_to_cpu(hdr->itt);
1489         hdr->ttt                = be32_to_cpu(hdr->ttt);
1490         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1491         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1492
1493         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1494                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1495                         " not set, protocol error.\n");
1496                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1497                                         buf, conn);
1498         }
1499
1500         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1501                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1502                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1503                         " error.\n", payload_length,
1504                         conn->conn_ops->MaxRecvDataSegmentLength);
1505                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1506                                         buf, conn);
1507         }
1508
1509         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1510                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1511                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1512                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1513                 payload_length);
1514         /*
1515          * This is not a response to a Unsolicited NopIN, which means
1516          * it can either be a NOPOUT ping request (with a valid ITT),
1517          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1518          * Either way, make sure we allocate an struct iscsi_cmd, as both
1519          * can contain ping data.
1520          */
1521         if (hdr->ttt == 0xFFFFFFFF) {
1522                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1523                 if (!cmd)
1524                         return iscsit_add_reject(
1525                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1526                                         1, buf, conn);
1527
1528                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1529                 cmd->i_state            = ISTATE_SEND_NOPIN;
1530                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1531                                                 1 : 0);
1532                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1533                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1534                 cmd->cmd_sn             = hdr->cmdsn;
1535                 cmd->exp_stat_sn        = hdr->exp_statsn;
1536                 cmd->data_direction     = DMA_NONE;
1537         }
1538
1539         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1540                 rx_size = payload_length;
1541                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1542                 if (!ping_data) {
1543                         pr_err("Unable to allocate memory for"
1544                                 " NOPOUT ping data.\n");
1545                         ret = -1;
1546                         goto out;
1547                 }
1548
1549                 iov = &cmd->iov_misc[0];
1550                 iov[niov].iov_base      = ping_data;
1551                 iov[niov++].iov_len     = payload_length;
1552
1553                 padding = ((-payload_length) & 3);
1554                 if (padding != 0) {
1555                         pr_debug("Receiving %u additional bytes"
1556                                 " for padding.\n", padding);
1557                         iov[niov].iov_base      = &cmd->pad_bytes;
1558                         iov[niov++].iov_len     = padding;
1559                         rx_size += padding;
1560                 }
1561                 if (conn->conn_ops->DataDigest) {
1562                         iov[niov].iov_base      = &checksum;
1563                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1564                         rx_size += ISCSI_CRC_LEN;
1565                 }
1566
1567                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1568                 if (rx_got != rx_size) {
1569                         ret = -1;
1570                         goto out;
1571                 }
1572
1573                 if (conn->conn_ops->DataDigest) {
1574                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1575                                         ping_data, payload_length,
1576                                         padding, cmd->pad_bytes,
1577                                         (u8 *)&data_crc);
1578
1579                         if (checksum != data_crc) {
1580                                 pr_err("Ping data CRC32C DataDigest"
1581                                 " 0x%08x does not match computed 0x%08x\n",
1582                                         checksum, data_crc);
1583                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1584                                         pr_err("Unable to recover from"
1585                                         " NOPOUT Ping DataCRC failure while in"
1586                                                 " ERL=0.\n");
1587                                         ret = -1;
1588                                         goto out;
1589                                 } else {
1590                                         /*
1591                                          * Silently drop this PDU and let the
1592                                          * initiator plug the CmdSN gap.
1593                                          */
1594                                         pr_debug("Dropping NOPOUT"
1595                                         " Command CmdSN: 0x%08x due to"
1596                                         " DataCRC error.\n", hdr->cmdsn);
1597                                         ret = 0;
1598                                         goto out;
1599                                 }
1600                         } else {
1601                                 pr_debug("Got CRC32C DataDigest"
1602                                 " 0x%08x for %u bytes of ping data.\n",
1603                                         checksum, payload_length);
1604                         }
1605                 }
1606
1607                 ping_data[payload_length] = '\0';
1608                 /*
1609                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1610                  */
1611                 cmd->buf_ptr = (void *)ping_data;
1612                 cmd->buf_ptr_size = payload_length;
1613
1614                 pr_debug("Got %u bytes of NOPOUT ping"
1615                         " data.\n", payload_length);
1616                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1617         }
1618
1619         if (hdr->itt != 0xFFFFFFFF) {
1620                 if (!cmd) {
1621                         pr_err("Checking CmdSN for NOPOUT,"
1622                                 " but cmd is NULL!\n");
1623                         return -1;
1624                 }
1625                 /*
1626                  * Initiator is expecting a NopIN ping reply,
1627                  */
1628                 spin_lock_bh(&conn->cmd_lock);
1629                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1630                 spin_unlock_bh(&conn->cmd_lock);
1631
1632                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1633
1634                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1635                         iscsit_add_cmd_to_response_queue(cmd, conn,
1636                                         cmd->i_state);
1637                         return 0;
1638                 }
1639
1640                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1641                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1642                         ret = 0;
1643                         goto ping_out;
1644                 }
1645                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1646                         return iscsit_add_reject_from_cmd(
1647                                         ISCSI_REASON_PROTOCOL_ERROR,
1648                                         1, 0, buf, cmd);
1649
1650                 return 0;
1651         }
1652
1653         if (hdr->ttt != 0xFFFFFFFF) {
1654                 /*
1655                  * This was a response to a unsolicited NOPIN ping.
1656                  */
1657                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1658                 if (!cmd)
1659                         return -1;
1660
1661                 iscsit_stop_nopin_response_timer(conn);
1662
1663                 cmd->i_state = ISTATE_REMOVE;
1664                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1665                 iscsit_start_nopin_timer(conn);
1666         } else {
1667                 /*
1668                  * Initiator is not expecting a NOPIN is response.
1669                  * Just ignore for now.
1670                  *
1671                  * iSCSI v19-91 10.18
1672                  * "A NOP-OUT may also be used to confirm a changed
1673                  *  ExpStatSN if another PDU will not be available
1674                  *  for a long time."
1675                  */
1676                 ret = 0;
1677                 goto out;
1678         }
1679
1680         return 0;
1681 out:
1682         if (cmd)
1683                 iscsit_release_cmd(cmd);
1684 ping_out:
1685         kfree(ping_data);
1686         return ret;
1687 }
1688
1689 static int iscsit_handle_task_mgt_cmd(
1690         struct iscsi_conn *conn,
1691         unsigned char *buf)
1692 {
1693         struct iscsi_cmd *cmd;
1694         struct se_tmr_req *se_tmr;
1695         struct iscsi_tmr_req *tmr_req;
1696         struct iscsi_tm *hdr;
1697         u32 payload_length;
1698         int out_of_order_cmdsn = 0;
1699         int ret;
1700         u8 function;
1701
1702         hdr                     = (struct iscsi_tm *) buf;
1703         payload_length          = ntoh24(hdr->dlength);
1704         hdr->itt                = be32_to_cpu(hdr->itt);
1705         hdr->rtt                = be32_to_cpu(hdr->rtt);
1706         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1707         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1708         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1709         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1710         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1711         function = hdr->flags;
1712
1713         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1714                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1715                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1716                 hdr->rtt, hdr->refcmdsn, conn->cid);
1717
1718         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1719             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1720              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1721                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1722                 hdr->rtt = ISCSI_RESERVED_TAG;
1723         }
1724
1725         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1726                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1727                 pr_err("Task Management Request TASK_REASSIGN not"
1728                         " issued as immediate command, bad iSCSI Initiator"
1729                                 "implementation\n");
1730                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1731                                         buf, conn);
1732         }
1733         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1734             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1735                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1736
1737         cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1738         if (!cmd)
1739                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1740                                         1, buf, conn);
1741
1742         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1743         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1744         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1745         cmd->init_task_tag      = hdr->itt;
1746         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1747         cmd->cmd_sn             = hdr->cmdsn;
1748         cmd->exp_stat_sn        = hdr->exp_statsn;
1749         se_tmr                  = cmd->se_cmd.se_tmr_req;
1750         tmr_req                 = cmd->tmr_req;
1751         /*
1752          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1753          */
1754         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1755                 ret = iscsit_get_lun_for_tmr(cmd,
1756                                 get_unaligned_le64(&hdr->lun));
1757                 if (ret < 0) {
1758                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1759                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1760                         goto attach;
1761                 }
1762         }
1763
1764         switch (function) {
1765         case ISCSI_TM_FUNC_ABORT_TASK:
1766                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1767                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1768                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1769                         goto attach;
1770                 }
1771                 break;
1772         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1773         case ISCSI_TM_FUNC_CLEAR_ACA:
1774         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1775         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1776                 break;
1777         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1778                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1779                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1780                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1781                         goto attach;
1782                 }
1783                 break;
1784         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1785                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1786                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1787                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1788                         goto attach;
1789                 }
1790                 break;
1791         case ISCSI_TM_FUNC_TASK_REASSIGN:
1792                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1793                 /*
1794                  * Perform sanity checks on the ExpDataSN only if the
1795                  * TASK_REASSIGN was successful.
1796                  */
1797                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1798                         break;
1799
1800                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1801                         return iscsit_add_reject_from_cmd(
1802                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1803                                         buf, cmd);
1804                 break;
1805         default:
1806                 pr_err("Unknown TMR function: 0x%02x, protocol"
1807                         " error.\n", function);
1808                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1809                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1810                 goto attach;
1811         }
1812
1813         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1814             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1815                 se_tmr->call_transport = 1;
1816 attach:
1817         spin_lock_bh(&conn->cmd_lock);
1818         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1819         spin_unlock_bh(&conn->cmd_lock);
1820
1821         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1822                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1823                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1824                         out_of_order_cmdsn = 1;
1825                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1826                         return 0;
1827                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1828                         return iscsit_add_reject_from_cmd(
1829                                         ISCSI_REASON_PROTOCOL_ERROR,
1830                                         1, 0, buf, cmd);
1831         }
1832         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1833
1834         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1835                 return 0;
1836         /*
1837          * Found the referenced task, send to transport for processing.
1838          */
1839         if (se_tmr->call_transport)
1840                 return transport_generic_handle_tmr(&cmd->se_cmd);
1841
1842         /*
1843          * Could not find the referenced LUN, task, or Task Management
1844          * command not authorized or supported.  Change state and
1845          * let the tx_thread send the response.
1846          *
1847          * For connection recovery, this is also the default action for
1848          * TMR TASK_REASSIGN.
1849          */
1850         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1851         return 0;
1852 }
1853
1854 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1855 static int iscsit_handle_text_cmd(
1856         struct iscsi_conn *conn,
1857         unsigned char *buf)
1858 {
1859         char *text_ptr, *text_in;
1860         int cmdsn_ret, niov = 0, rx_got, rx_size;
1861         u32 checksum = 0, data_crc = 0, payload_length;
1862         u32 padding = 0, pad_bytes = 0, text_length = 0;
1863         struct iscsi_cmd *cmd;
1864         struct kvec iov[3];
1865         struct iscsi_text *hdr;
1866
1867         hdr                     = (struct iscsi_text *) buf;
1868         payload_length          = ntoh24(hdr->dlength);
1869         hdr->itt                = be32_to_cpu(hdr->itt);
1870         hdr->ttt                = be32_to_cpu(hdr->ttt);
1871         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1872         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1873
1874         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1875                 pr_err("Unable to accept text parameter length: %u"
1876                         "greater than MaxRecvDataSegmentLength %u.\n",
1877                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1878                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1879                                         buf, conn);
1880         }
1881
1882         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1883                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1884                 hdr->exp_statsn, payload_length);
1885
1886         rx_size = text_length = payload_length;
1887         if (text_length) {
1888                 text_in = kzalloc(text_length, GFP_KERNEL);
1889                 if (!text_in) {
1890                         pr_err("Unable to allocate memory for"
1891                                 " incoming text parameters\n");
1892                         return -1;
1893                 }
1894
1895                 memset(iov, 0, 3 * sizeof(struct kvec));
1896                 iov[niov].iov_base      = text_in;
1897                 iov[niov++].iov_len     = text_length;
1898
1899                 padding = ((-payload_length) & 3);
1900                 if (padding != 0) {
1901                         iov[niov].iov_base = &pad_bytes;
1902                         iov[niov++].iov_len  = padding;
1903                         rx_size += padding;
1904                         pr_debug("Receiving %u additional bytes"
1905                                         " for padding.\n", padding);
1906                 }
1907                 if (conn->conn_ops->DataDigest) {
1908                         iov[niov].iov_base      = &checksum;
1909                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1910                         rx_size += ISCSI_CRC_LEN;
1911                 }
1912
1913                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1914                 if (rx_got != rx_size) {
1915                         kfree(text_in);
1916                         return -1;
1917                 }
1918
1919                 if (conn->conn_ops->DataDigest) {
1920                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1921                                         text_in, text_length,
1922                                         padding, (u8 *)&pad_bytes,
1923                                         (u8 *)&data_crc);
1924
1925                         if (checksum != data_crc) {
1926                                 pr_err("Text data CRC32C DataDigest"
1927                                         " 0x%08x does not match computed"
1928                                         " 0x%08x\n", checksum, data_crc);
1929                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1930                                         pr_err("Unable to recover from"
1931                                         " Text Data digest failure while in"
1932                                                 " ERL=0.\n");
1933                                         kfree(text_in);
1934                                         return -1;
1935                                 } else {
1936                                         /*
1937                                          * Silently drop this PDU and let the
1938                                          * initiator plug the CmdSN gap.
1939                                          */
1940                                         pr_debug("Dropping Text"
1941                                         " Command CmdSN: 0x%08x due to"
1942                                         " DataCRC error.\n", hdr->cmdsn);
1943                                         kfree(text_in);
1944                                         return 0;
1945                                 }
1946                         } else {
1947                                 pr_debug("Got CRC32C DataDigest"
1948                                         " 0x%08x for %u bytes of text data.\n",
1949                                                 checksum, text_length);
1950                         }
1951                 }
1952                 text_in[text_length - 1] = '\0';
1953                 pr_debug("Successfully read %d bytes of text"
1954                                 " data.\n", text_length);
1955
1956                 if (strncmp("SendTargets", text_in, 11) != 0) {
1957                         pr_err("Received Text Data that is not"
1958                                 " SendTargets, cannot continue.\n");
1959                         kfree(text_in);
1960                         return -1;
1961                 }
1962                 text_ptr = strchr(text_in, '=');
1963                 if (!text_ptr) {
1964                         pr_err("No \"=\" separator found in Text Data,"
1965                                 "  cannot continue.\n");
1966                         kfree(text_in);
1967                         return -1;
1968                 }
1969                 if (strncmp("=All", text_ptr, 4) != 0) {
1970                         pr_err("Unable to locate All value for"
1971                                 " SendTargets key,  cannot continue.\n");
1972                         kfree(text_in);
1973                         return -1;
1974                 }
1975 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1976                 kfree(text_in);
1977         }
1978
1979         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1980         if (!cmd)
1981                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1982                                         1, buf, conn);
1983
1984         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1985         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1986         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1987         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1988         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1989         cmd->cmd_sn             = hdr->cmdsn;
1990         cmd->exp_stat_sn        = hdr->exp_statsn;
1991         cmd->data_direction     = DMA_NONE;
1992
1993         spin_lock_bh(&conn->cmd_lock);
1994         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1995         spin_unlock_bh(&conn->cmd_lock);
1996
1997         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1998
1999         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2000                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2001                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2002                         return iscsit_add_reject_from_cmd(
2003                                         ISCSI_REASON_PROTOCOL_ERROR,
2004                                         1, 0, buf, cmd);
2005
2006                 return 0;
2007         }
2008
2009         return iscsit_execute_cmd(cmd, 0);
2010 }
2011
2012 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2013 {
2014         struct iscsi_conn *conn_p;
2015         struct iscsi_session *sess = conn->sess;
2016
2017         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2018                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2019
2020         atomic_set(&sess->session_logout, 1);
2021         atomic_set(&conn->conn_logout_remove, 1);
2022         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2023
2024         iscsit_inc_conn_usage_count(conn);
2025         iscsit_inc_session_usage_count(sess);
2026
2027         spin_lock_bh(&sess->conn_lock);
2028         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2029                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2030                         continue;
2031
2032                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2033                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2034         }
2035         spin_unlock_bh(&sess->conn_lock);
2036
2037         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2038
2039         return 0;
2040 }
2041
2042 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2043 {
2044         struct iscsi_conn *l_conn;
2045         struct iscsi_session *sess = conn->sess;
2046
2047         pr_debug("Received logout request CLOSECONNECTION for CID:"
2048                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2049
2050         /*
2051          * A Logout Request with a CLOSECONNECTION reason code for a CID
2052          * can arrive on a connection with a differing CID.
2053          */
2054         if (conn->cid == cmd->logout_cid) {
2055                 spin_lock_bh(&conn->state_lock);
2056                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2057                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2058
2059                 atomic_set(&conn->conn_logout_remove, 1);
2060                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2061                 iscsit_inc_conn_usage_count(conn);
2062
2063                 spin_unlock_bh(&conn->state_lock);
2064         } else {
2065                 /*
2066                  * Handle all different cid CLOSECONNECTION requests in
2067                  * iscsit_logout_post_handler_diffcid() as to give enough
2068                  * time for any non immediate command's CmdSN to be
2069                  * acknowledged on the connection in question.
2070                  *
2071                  * Here we simply make sure the CID is still around.
2072                  */
2073                 l_conn = iscsit_get_conn_from_cid(sess,
2074                                 cmd->logout_cid);
2075                 if (!l_conn) {
2076                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2077                         iscsit_add_cmd_to_response_queue(cmd, conn,
2078                                         cmd->i_state);
2079                         return 0;
2080                 }
2081
2082                 iscsit_dec_conn_usage_count(l_conn);
2083         }
2084
2085         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2086
2087         return 0;
2088 }
2089
2090 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2091 {
2092         struct iscsi_session *sess = conn->sess;
2093
2094         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2095                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2096
2097         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2098                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2099                         " while ERL!=2.\n");
2100                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2101                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2102                 return 0;
2103         }
2104
2105         if (conn->cid == cmd->logout_cid) {
2106                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2107                         " with CID: %hu on CID: %hu, implementation error.\n",
2108                                 cmd->logout_cid, conn->cid);
2109                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2110                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2111                 return 0;
2112         }
2113
2114         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2115
2116         return 0;
2117 }
2118
2119 static int iscsit_handle_logout_cmd(
2120         struct iscsi_conn *conn,
2121         unsigned char *buf)
2122 {
2123         int cmdsn_ret, logout_remove = 0;
2124         u8 reason_code = 0;
2125         struct iscsi_cmd *cmd;
2126         struct iscsi_logout *hdr;
2127         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2128
2129         hdr                     = (struct iscsi_logout *) buf;
2130         reason_code             = (hdr->flags & 0x7f);
2131         hdr->itt                = be32_to_cpu(hdr->itt);
2132         hdr->cid                = be16_to_cpu(hdr->cid);
2133         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2134         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2135
2136         if (tiqn) {
2137                 spin_lock(&tiqn->logout_stats.lock);
2138                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2139                         tiqn->logout_stats.normal_logouts++;
2140                 else
2141                         tiqn->logout_stats.abnormal_logouts++;
2142                 spin_unlock(&tiqn->logout_stats.lock);
2143         }
2144
2145         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2146                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2147                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2148                 hdr->cid, conn->cid);
2149
2150         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2151                 pr_err("Received logout request on connection that"
2152                         " is not in logged in state, ignoring request.\n");
2153                 return 0;
2154         }
2155
2156         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2157         if (!cmd)
2158                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2159                                         buf, conn);
2160
2161         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2162         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2163         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2164         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2165         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2166         cmd->cmd_sn             = hdr->cmdsn;
2167         cmd->exp_stat_sn        = hdr->exp_statsn;
2168         cmd->logout_cid         = hdr->cid;
2169         cmd->logout_reason      = reason_code;
2170         cmd->data_direction     = DMA_NONE;
2171
2172         /*
2173          * We need to sleep in these cases (by returning 1) until the Logout
2174          * Response gets sent in the tx thread.
2175          */
2176         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2177            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2178             (hdr->cid == conn->cid)))
2179                 logout_remove = 1;
2180
2181         spin_lock_bh(&conn->cmd_lock);
2182         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2183         spin_unlock_bh(&conn->cmd_lock);
2184
2185         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2186                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2187
2188         /*
2189          * Immediate commands are executed, well, immediately.
2190          * Non-Immediate Logout Commands are executed in CmdSN order.
2191          */
2192         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2193                 int ret = iscsit_execute_cmd(cmd, 0);
2194
2195                 if (ret < 0)
2196                         return ret;
2197         } else {
2198                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2199                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2200                         logout_remove = 0;
2201                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2202                         return iscsit_add_reject_from_cmd(
2203                                 ISCSI_REASON_PROTOCOL_ERROR,
2204                                 1, 0, buf, cmd);
2205                 }
2206         }
2207
2208         return logout_remove;
2209 }
2210
2211 static int iscsit_handle_snack(
2212         struct iscsi_conn *conn,
2213         unsigned char *buf)
2214 {
2215         u32 unpacked_lun;
2216         u64 lun;
2217         struct iscsi_snack *hdr;
2218
2219         hdr                     = (struct iscsi_snack *) buf;
2220         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2221         lun                     = get_unaligned_le64(&hdr->lun);
2222         unpacked_lun            = scsilun_to_int((struct scsi_lun *)&lun);
2223         hdr->itt                = be32_to_cpu(hdr->itt);
2224         hdr->ttt                = be32_to_cpu(hdr->ttt);
2225         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2226         hdr->begrun             = be32_to_cpu(hdr->begrun);
2227         hdr->runlength          = be32_to_cpu(hdr->runlength);
2228
2229         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2230                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2231                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2232                         hdr->begrun, hdr->runlength, conn->cid);
2233
2234         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2235                 pr_err("Initiator sent SNACK request while in"
2236                         " ErrorRecoveryLevel=0.\n");
2237                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2238                                         buf, conn);
2239         }
2240         /*
2241          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2242          * call from inside iscsi_send_recovery_datain_or_r2t().
2243          */
2244         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2245         case 0:
2246                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2247                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2248         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2249                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2250                         hdr->begrun, hdr->runlength);
2251         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2252                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2253                         hdr->runlength);
2254         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2255                 /* FIXME: Support R-Data SNACK */
2256                 pr_err("R-Data SNACK Not Supported.\n");
2257                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2258                                         buf, conn);
2259         default:
2260                 pr_err("Unknown SNACK type 0x%02x, protocol"
2261                         " error.\n", hdr->flags & 0x0f);
2262                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2263                                         buf, conn);
2264         }
2265
2266         return 0;
2267 }
2268
2269 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2270 {
2271         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2272             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2273                 wait_for_completion_interruptible_timeout(
2274                                         &conn->rx_half_close_comp,
2275                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2276         }
2277 }
2278
2279 static int iscsit_handle_immediate_data(
2280         struct iscsi_cmd *cmd,
2281         unsigned char *buf,
2282         u32 length)
2283 {
2284         int iov_ret, rx_got = 0, rx_size = 0;
2285         u32 checksum, iov_count = 0, padding = 0;
2286         struct iscsi_conn *conn = cmd->conn;
2287         struct kvec *iov;
2288
2289         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2290         if (iov_ret < 0)
2291                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2292
2293         rx_size = length;
2294         iov_count = iov_ret;
2295         iov = &cmd->iov_data[0];
2296
2297         padding = ((-length) & 3);
2298         if (padding != 0) {
2299                 iov[iov_count].iov_base = cmd->pad_bytes;
2300                 iov[iov_count++].iov_len = padding;
2301                 rx_size += padding;
2302         }
2303
2304         if (conn->conn_ops->DataDigest) {
2305                 iov[iov_count].iov_base         = &checksum;
2306                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2307                 rx_size += ISCSI_CRC_LEN;
2308         }
2309
2310         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2311
2312         iscsit_unmap_iovec(cmd);
2313
2314         if (rx_got != rx_size) {
2315                 iscsit_rx_thread_wait_for_tcp(conn);
2316                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2317         }
2318
2319         if (conn->conn_ops->DataDigest) {
2320                 u32 data_crc;
2321
2322                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2323                                                     cmd->write_data_done, length, padding,
2324                                                     cmd->pad_bytes);
2325
2326                 if (checksum != data_crc) {
2327                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2328                                 " does not match computed 0x%08x\n", checksum,
2329                                 data_crc);
2330
2331                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2332                                 pr_err("Unable to recover from"
2333                                         " Immediate Data digest failure while"
2334                                         " in ERL=0.\n");
2335                                 iscsit_add_reject_from_cmd(
2336                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2337                                                 1, 0, buf, cmd);
2338                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2339                         } else {
2340                                 iscsit_add_reject_from_cmd(
2341                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2342                                                 0, 0, buf, cmd);
2343                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2344                         }
2345                 } else {
2346                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2347                                 " %u bytes of Immediate Data\n", checksum,
2348                                 length);
2349                 }
2350         }
2351
2352         cmd->write_data_done += length;
2353
2354         if (cmd->write_data_done == cmd->data_length) {
2355                 spin_lock_bh(&cmd->istate_lock);
2356                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2357                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2358                 spin_unlock_bh(&cmd->istate_lock);
2359         }
2360
2361         return IMMEDIATE_DATA_NORMAL_OPERATION;
2362 }
2363
2364 /*
2365  *      Called with sess->conn_lock held.
2366  */
2367 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2368         with active network interface */
2369 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2370 {
2371         struct iscsi_cmd *cmd;
2372         struct iscsi_conn *conn_p;
2373
2374         /*
2375          * Only send a Asynchronous Message on connections whos network
2376          * interface is still functional.
2377          */
2378         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2379                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2380                         iscsit_inc_conn_usage_count(conn_p);
2381                         break;
2382                 }
2383         }
2384
2385         if (!conn_p)
2386                 return;
2387
2388         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2389         if (!cmd) {
2390                 iscsit_dec_conn_usage_count(conn_p);
2391                 return;
2392         }
2393
2394         cmd->logout_cid = conn->cid;
2395         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2396         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2397
2398         spin_lock_bh(&conn_p->cmd_lock);
2399         list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2400         spin_unlock_bh(&conn_p->cmd_lock);
2401
2402         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2403         iscsit_dec_conn_usage_count(conn_p);
2404 }
2405
2406 static int iscsit_send_conn_drop_async_message(
2407         struct iscsi_cmd *cmd,
2408         struct iscsi_conn *conn)
2409 {
2410         struct iscsi_async *hdr;
2411
2412         cmd->tx_size = ISCSI_HDR_LEN;
2413         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2414
2415         hdr                     = (struct iscsi_async *) cmd->pdu;
2416         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2417         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2418         cmd->init_task_tag      = 0xFFFFFFFF;
2419         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2420         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2421         cmd->stat_sn            = conn->stat_sn++;
2422         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2423         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2424         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2425         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2426         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2427         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2428         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2429
2430         if (conn->conn_ops->HeaderDigest) {
2431                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2432
2433                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2434                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2435                                 0, NULL, (u8 *)header_digest);
2436
2437                 cmd->tx_size += ISCSI_CRC_LEN;
2438                 pr_debug("Attaching CRC32C HeaderDigest to"
2439                         " Async Message 0x%08x\n", *header_digest);
2440         }
2441
2442         cmd->iov_misc[0].iov_base       = cmd->pdu;
2443         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2444         cmd->iov_misc_count             = 1;
2445
2446         pr_debug("Sending Connection Dropped Async Message StatSN:"
2447                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2448                         cmd->logout_cid, conn->cid);
2449         return 0;
2450 }
2451
2452 static int iscsit_send_data_in(
2453         struct iscsi_cmd *cmd,
2454         struct iscsi_conn *conn,
2455         int *eodr)
2456 {
2457         int iov_ret = 0, set_statsn = 0;
2458         u32 iov_count = 0, tx_size = 0;
2459         struct iscsi_datain datain;
2460         struct iscsi_datain_req *dr;
2461         struct iscsi_data_rsp *hdr;
2462         struct kvec *iov;
2463
2464         memset(&datain, 0, sizeof(struct iscsi_datain));
2465         dr = iscsit_get_datain_values(cmd, &datain);
2466         if (!dr) {
2467                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2468                                 cmd->init_task_tag);
2469                 return -1;
2470         }
2471
2472         /*
2473          * Be paranoid and double check the logic for now.
2474          */
2475         if ((datain.offset + datain.length) > cmd->data_length) {
2476                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2477                         " datain.length: %u exceeds cmd->data_length: %u\n",
2478                         cmd->init_task_tag, datain.offset, datain.length,
2479                                 cmd->data_length);
2480                 return -1;
2481         }
2482
2483         spin_lock_bh(&conn->sess->session_stats_lock);
2484         conn->sess->tx_data_octets += datain.length;
2485         if (conn->sess->se_sess->se_node_acl) {
2486                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2487                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2488                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2489         }
2490         spin_unlock_bh(&conn->sess->session_stats_lock);
2491         /*
2492          * Special case for successfully execution w/ both DATAIN
2493          * and Sense Data.
2494          */
2495         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2496             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2497                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2498         else {
2499                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2500                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2501                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2502                         cmd->stat_sn = conn->stat_sn++;
2503                         set_statsn = 1;
2504                 } else if (dr->dr_complete ==
2505                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2506                         set_statsn = 1;
2507         }
2508
2509         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2510         memset(hdr, 0, ISCSI_HDR_LEN);
2511         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2512         hdr->flags              = datain.flags;
2513         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2514                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2515                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2516                         hdr->residual_count = cpu_to_be32(cmd->residual_count);
2517                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2518                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2519                         hdr->residual_count = cpu_to_be32(cmd->residual_count);
2520                 }
2521         }
2522         hton24(hdr->dlength, datain.length);
2523         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2524                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2525                                 (struct scsi_lun *)&hdr->lun);
2526         else
2527                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2528
2529         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2530         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2531                                    cpu_to_be32(cmd->targ_xfer_tag) :
2532                                    0xFFFFFFFF;
2533         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2534                                                 0xFFFFFFFF;
2535         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2536         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2537         hdr->datasn             = cpu_to_be32(datain.data_sn);
2538         hdr->offset             = cpu_to_be32(datain.offset);
2539
2540         iov = &cmd->iov_data[0];
2541         iov[iov_count].iov_base = cmd->pdu;
2542         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2543         tx_size += ISCSI_HDR_LEN;
2544
2545         if (conn->conn_ops->HeaderDigest) {
2546                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2547
2548                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2549                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2550                                 0, NULL, (u8 *)header_digest);
2551
2552                 iov[0].iov_len += ISCSI_CRC_LEN;
2553                 tx_size += ISCSI_CRC_LEN;
2554
2555                 pr_debug("Attaching CRC32 HeaderDigest"
2556                         " for DataIN PDU 0x%08x\n", *header_digest);
2557         }
2558
2559         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2560         if (iov_ret < 0)
2561                 return -1;
2562
2563         iov_count += iov_ret;
2564         tx_size += datain.length;
2565
2566         cmd->padding = ((-datain.length) & 3);
2567         if (cmd->padding) {
2568                 iov[iov_count].iov_base         = cmd->pad_bytes;
2569                 iov[iov_count++].iov_len        = cmd->padding;
2570                 tx_size += cmd->padding;
2571
2572                 pr_debug("Attaching %u padding bytes\n",
2573                                 cmd->padding);
2574         }
2575         if (conn->conn_ops->DataDigest) {
2576                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2577                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2578
2579                 iov[iov_count].iov_base = &cmd->data_crc;
2580                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2581                 tx_size += ISCSI_CRC_LEN;
2582
2583                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2584                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2585         }
2586
2587         cmd->iov_data_count = iov_count;
2588         cmd->tx_size = tx_size;
2589
2590         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2591                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2592                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2593                 ntohl(hdr->offset), datain.length, conn->cid);
2594
2595         if (dr->dr_complete) {
2596                 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2597                                 2 : 1;
2598                 iscsit_free_datain_req(cmd, dr);
2599         }
2600
2601         return 0;
2602 }
2603
2604 static int iscsit_send_logout_response(
2605         struct iscsi_cmd *cmd,
2606         struct iscsi_conn *conn)
2607 {
2608         int niov = 0, tx_size;
2609         struct iscsi_conn *logout_conn = NULL;
2610         struct iscsi_conn_recovery *cr = NULL;
2611         struct iscsi_session *sess = conn->sess;
2612         struct kvec *iov;
2613         struct iscsi_logout_rsp *hdr;
2614         /*
2615          * The actual shutting down of Sessions and/or Connections
2616          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2617          * is done in scsi_logout_post_handler().
2618          */
2619         switch (cmd->logout_reason) {
2620         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2621                 pr_debug("iSCSI session logout successful, setting"
2622                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2623                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2624                 break;
2625         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2626                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2627                         break;
2628                 /*
2629                  * For CLOSECONNECTION logout requests carrying
2630                  * a matching logout CID -> local CID, the reference
2631                  * for the local CID will have been incremented in
2632                  * iscsi_logout_closeconnection().
2633                  *
2634                  * For CLOSECONNECTION logout requests carrying
2635                  * a different CID than the connection it arrived
2636                  * on, the connection responding to cmd->logout_cid
2637                  * is stopped in iscsit_logout_post_handler_diffcid().
2638                  */
2639
2640                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2641                         " successful.\n", cmd->logout_cid, conn->cid);
2642                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2643                 break;
2644         case ISCSI_LOGOUT_REASON_RECOVERY:
2645                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2646                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2647                         break;
2648                 /*
2649                  * If the connection is still active from our point of view
2650                  * force connection recovery to occur.
2651                  */
2652                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2653                                 cmd->logout_cid);
2654                 if ((logout_conn)) {
2655                         iscsit_connection_reinstatement_rcfr(logout_conn);
2656                         iscsit_dec_conn_usage_count(logout_conn);
2657                 }
2658
2659                 cr = iscsit_get_inactive_connection_recovery_entry(
2660                                 conn->sess, cmd->logout_cid);
2661                 if (!cr) {
2662                         pr_err("Unable to locate CID: %hu for"
2663                         " REMOVECONNFORRECOVERY Logout Request.\n",
2664                                 cmd->logout_cid);
2665                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2666                         break;
2667                 }
2668
2669                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2670
2671                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2672                         " for recovery for CID: %hu on CID: %hu successful.\n",
2673                                 cmd->logout_cid, conn->cid);
2674                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2675                 break;
2676         default:
2677                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2678                                 cmd->logout_reason);
2679                 return -1;
2680         }
2681
2682         tx_size = ISCSI_HDR_LEN;
2683         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2684         memset(hdr, 0, ISCSI_HDR_LEN);
2685         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2686         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2687         hdr->response           = cmd->logout_response;
2688         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2689         cmd->stat_sn            = conn->stat_sn++;
2690         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2691
2692         iscsit_increment_maxcmdsn(cmd, conn->sess);
2693         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2694         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2695
2696         iov = &cmd->iov_misc[0];
2697         iov[niov].iov_base      = cmd->pdu;
2698         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2699
2700         if (conn->conn_ops->HeaderDigest) {
2701                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2702
2703                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2704                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2705                                 0, NULL, (u8 *)header_digest);
2706
2707                 iov[0].iov_len += ISCSI_CRC_LEN;
2708                 tx_size += ISCSI_CRC_LEN;
2709                 pr_debug("Attaching CRC32C HeaderDigest to"
2710                         " Logout Response 0x%08x\n", *header_digest);
2711         }
2712         cmd->iov_misc_count = niov;
2713         cmd->tx_size = tx_size;
2714
2715         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2716                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2717                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2718                 cmd->logout_cid, conn->cid);
2719
2720         return 0;
2721 }
2722
2723 /*
2724  *      Unsolicited NOPIN, either requesting a response or not.
2725  */
2726 static int iscsit_send_unsolicited_nopin(
2727         struct iscsi_cmd *cmd,
2728         struct iscsi_conn *conn,
2729         int want_response)
2730 {
2731         int tx_size = ISCSI_HDR_LEN;
2732         struct iscsi_nopin *hdr;
2733
2734         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2735         memset(hdr, 0, ISCSI_HDR_LEN);
2736         hdr->opcode             = ISCSI_OP_NOOP_IN;
2737         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2738         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2739         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2740         cmd->stat_sn            = conn->stat_sn;
2741         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2742         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2743         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2744
2745         if (conn->conn_ops->HeaderDigest) {
2746                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2747
2748                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2749                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2750                                 0, NULL, (u8 *)header_digest);
2751
2752                 tx_size += ISCSI_CRC_LEN;
2753                 pr_debug("Attaching CRC32C HeaderDigest to"
2754                         " NopIN 0x%08x\n", *header_digest);
2755         }
2756
2757         cmd->iov_misc[0].iov_base       = cmd->pdu;
2758         cmd->iov_misc[0].iov_len        = tx_size;
2759         cmd->iov_misc_count     = 1;
2760         cmd->tx_size            = tx_size;
2761
2762         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2763                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2764
2765         return 0;
2766 }
2767
2768 static int iscsit_send_nopin_response(
2769         struct iscsi_cmd *cmd,
2770         struct iscsi_conn *conn)
2771 {
2772         int niov = 0, tx_size;
2773         u32 padding = 0;
2774         struct kvec *iov;
2775         struct iscsi_nopin *hdr;
2776
2777         tx_size = ISCSI_HDR_LEN;
2778         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2779         memset(hdr, 0, ISCSI_HDR_LEN);
2780         hdr->opcode             = ISCSI_OP_NOOP_IN;
2781         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2782         hton24(hdr->dlength, cmd->buf_ptr_size);
2783         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2784         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2785         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2786         cmd->stat_sn            = conn->stat_sn++;
2787         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2788
2789         iscsit_increment_maxcmdsn(cmd, conn->sess);
2790         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2791         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2792
2793         iov = &cmd->iov_misc[0];
2794         iov[niov].iov_base      = cmd->pdu;
2795         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2796
2797         if (conn->conn_ops->HeaderDigest) {
2798                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2799
2800                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2801                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2802                                 0, NULL, (u8 *)header_digest);
2803
2804                 iov[0].iov_len += ISCSI_CRC_LEN;
2805                 tx_size += ISCSI_CRC_LEN;
2806                 pr_debug("Attaching CRC32C HeaderDigest"
2807                         " to NopIn 0x%08x\n", *header_digest);
2808         }
2809
2810         /*
2811          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2812          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2813          */
2814         if (cmd->buf_ptr_size) {
2815                 iov[niov].iov_base      = cmd->buf_ptr;
2816                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2817                 tx_size += cmd->buf_ptr_size;
2818
2819                 pr_debug("Echoing back %u bytes of ping"
2820                         " data.\n", cmd->buf_ptr_size);
2821
2822                 padding = ((-cmd->buf_ptr_size) & 3);
2823                 if (padding != 0) {
2824                         iov[niov].iov_base = &cmd->pad_bytes;
2825                         iov[niov++].iov_len = padding;
2826                         tx_size += padding;
2827                         pr_debug("Attaching %u additional"
2828                                 " padding bytes.\n", padding);
2829                 }
2830                 if (conn->conn_ops->DataDigest) {
2831                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2832                                 cmd->buf_ptr, cmd->buf_ptr_size,
2833                                 padding, (u8 *)&cmd->pad_bytes,
2834                                 (u8 *)&cmd->data_crc);
2835
2836                         iov[niov].iov_base = &cmd->data_crc;
2837                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2838                         tx_size += ISCSI_CRC_LEN;
2839                         pr_debug("Attached DataDigest for %u"
2840                                 " bytes of ping data, CRC 0x%08x\n",
2841                                 cmd->buf_ptr_size, cmd->data_crc);
2842                 }
2843         }
2844
2845         cmd->iov_misc_count = niov;
2846         cmd->tx_size = tx_size;
2847
2848         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2849                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2850                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2851
2852         return 0;
2853 }
2854
2855 int iscsit_send_r2t(
2856         struct iscsi_cmd *cmd,
2857         struct iscsi_conn *conn)
2858 {
2859         int tx_size = 0;
2860         struct iscsi_r2t *r2t;
2861         struct iscsi_r2t_rsp *hdr;
2862
2863         r2t = iscsit_get_r2t_from_list(cmd);
2864         if (!r2t)
2865                 return -1;
2866
2867         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2868         memset(hdr, 0, ISCSI_HDR_LEN);
2869         hdr->opcode             = ISCSI_OP_R2T;
2870         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2871         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2872                         (struct scsi_lun *)&hdr->lun);
2873         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2874         spin_lock_bh(&conn->sess->ttt_lock);
2875         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2876         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2877                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2878         spin_unlock_bh(&conn->sess->ttt_lock);
2879         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2880         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2881         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2882         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2883         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2884         hdr->data_offset        = cpu_to_be32(r2t->offset);
2885         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2886
2887         cmd->iov_misc[0].iov_base       = cmd->pdu;
2888         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2889         tx_size += ISCSI_HDR_LEN;
2890
2891         if (conn->conn_ops->HeaderDigest) {
2892                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2893
2894                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2895                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2896                                 0, NULL, (u8 *)header_digest);
2897
2898                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2899                 tx_size += ISCSI_CRC_LEN;
2900                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2901                         " PDU 0x%08x\n", *header_digest);
2902         }
2903
2904         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2905                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2906                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2907                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2908                         r2t->offset, r2t->xfer_len, conn->cid);
2909
2910         cmd->iov_misc_count = 1;
2911         cmd->tx_size = tx_size;
2912
2913         spin_lock_bh(&cmd->r2t_lock);
2914         r2t->sent_r2t = 1;
2915         spin_unlock_bh(&cmd->r2t_lock);
2916
2917         return 0;
2918 }
2919
2920 /*
2921  *      type 0: Normal Operation.
2922  *      type 1: Called from Storage Transport.
2923  *      type 2: Called from iscsi_task_reassign_complete_write() for
2924  *              connection recovery.
2925  */
2926 int iscsit_build_r2ts_for_cmd(
2927         struct iscsi_cmd *cmd,
2928         struct iscsi_conn *conn,
2929         int type)
2930 {
2931         int first_r2t = 1;
2932         u32 offset = 0, xfer_len = 0;
2933
2934         spin_lock_bh(&cmd->r2t_lock);
2935         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2936                 spin_unlock_bh(&cmd->r2t_lock);
2937                 return 0;
2938         }
2939
2940         if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2941                 if (cmd->r2t_offset < cmd->write_data_done)
2942                         cmd->r2t_offset = cmd->write_data_done;
2943
2944         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2945                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2946                         offset = cmd->r2t_offset;
2947
2948                         if (first_r2t && (type == 2)) {
2949                                 xfer_len = ((offset +
2950                                              (conn->sess->sess_ops->MaxBurstLength -
2951                                              cmd->next_burst_len) >
2952                                              cmd->data_length) ?
2953                                             (cmd->data_length - offset) :
2954                                             (conn->sess->sess_ops->MaxBurstLength -
2955                                              cmd->next_burst_len));
2956                         } else {
2957                                 xfer_len = ((offset +
2958                                              conn->sess->sess_ops->MaxBurstLength) >
2959                                              cmd->data_length) ?
2960                                              (cmd->data_length - offset) :
2961                                              conn->sess->sess_ops->MaxBurstLength;
2962                         }
2963                         cmd->r2t_offset += xfer_len;
2964
2965                         if (cmd->r2t_offset == cmd->data_length)
2966                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2967                 } else {
2968                         struct iscsi_seq *seq;
2969
2970                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2971                         if (!seq) {
2972                                 spin_unlock_bh(&cmd->r2t_lock);
2973                                 return -1;
2974                         }
2975
2976                         offset = seq->offset;
2977                         xfer_len = seq->xfer_len;
2978
2979                         if (cmd->seq_send_order == cmd->seq_count)
2980                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2981                 }
2982                 cmd->outstanding_r2ts++;
2983                 first_r2t = 0;
2984
2985                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2986                         spin_unlock_bh(&cmd->r2t_lock);
2987                         return -1;
2988                 }
2989
2990                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2991                         break;
2992         }
2993         spin_unlock_bh(&cmd->r2t_lock);
2994
2995         return 0;
2996 }
2997
2998 static int iscsit_send_status(
2999         struct iscsi_cmd *cmd,
3000         struct iscsi_conn *conn)
3001 {
3002         u8 iov_count = 0, recovery;
3003         u32 padding = 0, tx_size = 0;
3004         struct iscsi_scsi_rsp *hdr;
3005         struct kvec *iov;
3006
3007         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3008         if (!recovery)
3009                 cmd->stat_sn = conn->stat_sn++;
3010
3011         spin_lock_bh(&conn->sess->session_stats_lock);
3012         conn->sess->rsp_pdus++;
3013         spin_unlock_bh(&conn->sess->session_stats_lock);
3014
3015         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3016         memset(hdr, 0, ISCSI_HDR_LEN);
3017         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3018         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3019         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3020                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3021                 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3022         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3023                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3024                 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3025         }
3026         hdr->response           = cmd->iscsi_response;
3027         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3028         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3029         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3030
3031         iscsit_increment_maxcmdsn(cmd, conn->sess);
3032         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3033         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3034
3035         iov = &cmd->iov_misc[0];
3036         iov[iov_count].iov_base = cmd->pdu;
3037         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3038         tx_size += ISCSI_HDR_LEN;
3039
3040         /*
3041          * Attach SENSE DATA payload to iSCSI Response PDU
3042          */
3043         if (cmd->se_cmd.sense_buffer &&
3044            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3045             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3046                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3047                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3048                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3049                 iov[iov_count++].iov_len =
3050                                 (cmd->se_cmd.scsi_sense_length + padding);
3051                 tx_size += cmd->se_cmd.scsi_sense_length;
3052
3053                 if (padding) {
3054                         memset(cmd->se_cmd.sense_buffer +
3055                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3056                         tx_size += padding;
3057                         pr_debug("Adding %u bytes of padding to"
3058                                 " SENSE.\n", padding);
3059                 }
3060
3061                 if (conn->conn_ops->DataDigest) {
3062                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3063                                 cmd->se_cmd.sense_buffer,
3064                                 (cmd->se_cmd.scsi_sense_length + padding),
3065                                 0, NULL, (u8 *)&cmd->data_crc);
3066
3067                         iov[iov_count].iov_base    = &cmd->data_crc;
3068                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3069                         tx_size += ISCSI_CRC_LEN;
3070
3071                         pr_debug("Attaching CRC32 DataDigest for"
3072                                 " SENSE, %u bytes CRC 0x%08x\n",
3073                                 (cmd->se_cmd.scsi_sense_length + padding),
3074                                 cmd->data_crc);
3075                 }
3076
3077                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3078                                 " Response PDU\n",
3079                                 cmd->se_cmd.scsi_sense_length);
3080         }
3081
3082         if (conn->conn_ops->HeaderDigest) {
3083                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3084
3085                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3086                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3087                                 0, NULL, (u8 *)header_digest);
3088
3089                 iov[0].iov_len += ISCSI_CRC_LEN;
3090                 tx_size += ISCSI_CRC_LEN;
3091                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3092                                 " PDU 0x%08x\n", *header_digest);
3093         }
3094
3095         cmd->iov_misc_count = iov_count;
3096         cmd->tx_size = tx_size;
3097
3098         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3099                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3100                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3101                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3102
3103         return 0;
3104 }
3105
3106 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3107 {
3108         switch (se_tmr->response) {
3109         case TMR_FUNCTION_COMPLETE:
3110                 return ISCSI_TMF_RSP_COMPLETE;
3111         case TMR_TASK_DOES_NOT_EXIST:
3112                 return ISCSI_TMF_RSP_NO_TASK;
3113         case TMR_LUN_DOES_NOT_EXIST:
3114                 return ISCSI_TMF_RSP_NO_LUN;
3115         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3116                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3117         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3118                 return ISCSI_TMF_RSP_AUTH_FAILED;
3119         case TMR_FUNCTION_REJECTED:
3120         default:
3121                 return ISCSI_TMF_RSP_REJECTED;
3122         }
3123 }
3124
3125 static int iscsit_send_task_mgt_rsp(
3126         struct iscsi_cmd *cmd,
3127         struct iscsi_conn *conn)
3128 {
3129         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3130         struct iscsi_tm_rsp *hdr;
3131         u32 tx_size = 0;
3132
3133         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3134         memset(hdr, 0, ISCSI_HDR_LEN);
3135         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3136         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3137         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3138         cmd->stat_sn            = conn->stat_sn++;
3139         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3140
3141         iscsit_increment_maxcmdsn(cmd, conn->sess);
3142         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3143         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3144
3145         cmd->iov_misc[0].iov_base       = cmd->pdu;
3146         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3147         tx_size += ISCSI_HDR_LEN;
3148
3149         if (conn->conn_ops->HeaderDigest) {
3150                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3151
3152                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3153                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3154                                 0, NULL, (u8 *)header_digest);
3155
3156                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3157                 tx_size += ISCSI_CRC_LEN;
3158                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3159                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3160         }
3161
3162         cmd->iov_misc_count = 1;
3163         cmd->tx_size = tx_size;
3164
3165         pr_debug("Built Task Management Response ITT: 0x%08x,"
3166                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3167                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3168
3169         return 0;
3170 }
3171
3172 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3173 {
3174         char *payload = NULL;
3175         struct iscsi_conn *conn = cmd->conn;
3176         struct iscsi_portal_group *tpg;
3177         struct iscsi_tiqn *tiqn;
3178         struct iscsi_tpg_np *tpg_np;
3179         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3180         unsigned char buf[256];
3181
3182         buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3183                         32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3184
3185         memset(buf, 0, 256);
3186
3187         payload = kzalloc(buffer_len, GFP_KERNEL);
3188         if (!payload) {
3189                 pr_err("Unable to allocate memory for sendtargets"
3190                                 " response.\n");
3191                 return -ENOMEM;
3192         }
3193
3194         spin_lock(&tiqn_lock);
3195         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3196                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3197                 len += 1;
3198
3199                 if ((len + payload_len) > buffer_len) {
3200                         spin_unlock(&tiqn->tiqn_tpg_lock);
3201                         end_of_buf = 1;
3202                         goto eob;
3203                 }
3204                 memcpy((void *)payload + payload_len, buf, len);
3205                 payload_len += len;
3206
3207                 spin_lock(&tiqn->tiqn_tpg_lock);
3208                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3209
3210                         spin_lock(&tpg->tpg_state_lock);
3211                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3212                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3213                                 spin_unlock(&tpg->tpg_state_lock);
3214                                 continue;
3215                         }
3216                         spin_unlock(&tpg->tpg_state_lock);
3217
3218                         spin_lock(&tpg->tpg_np_lock);
3219                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3220                                                 tpg_np_list) {
3221                                 len = sprintf(buf, "TargetAddress="
3222                                         "%s%s%s:%hu,%hu",
3223                                         (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3224                                         "[" : "", tpg_np->tpg_np->np_ip,
3225                                         (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3226                                         "]" : "", tpg_np->tpg_np->np_port,
3227                                         tpg->tpgt);
3228                                 len += 1;
3229
3230                                 if ((len + payload_len) > buffer_len) {
3231                                         spin_unlock(&tpg->tpg_np_lock);
3232                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3233                                         end_of_buf = 1;
3234                                         goto eob;
3235                                 }
3236                                 memcpy((void *)payload + payload_len, buf, len);
3237                                 payload_len += len;
3238                         }
3239                         spin_unlock(&tpg->tpg_np_lock);
3240                 }
3241                 spin_unlock(&tiqn->tiqn_tpg_lock);
3242 eob:
3243                 if (end_of_buf)
3244                         break;
3245         }
3246         spin_unlock(&tiqn_lock);
3247
3248         cmd->buf_ptr = payload;
3249
3250         return payload_len;
3251 }
3252
3253 /*
3254  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3255  *      MaxRecvDataSegmentLength.
3256  */
3257 static int iscsit_send_text_rsp(
3258         struct iscsi_cmd *cmd,
3259         struct iscsi_conn *conn)
3260 {
3261         struct iscsi_text_rsp *hdr;
3262         struct kvec *iov;
3263         u32 padding = 0, tx_size = 0;
3264         int text_length, iov_count = 0;
3265
3266         text_length = iscsit_build_sendtargets_response(cmd);
3267         if (text_length < 0)
3268                 return text_length;
3269
3270         padding = ((-text_length) & 3);
3271         if (padding != 0) {
3272                 memset(cmd->buf_ptr + text_length, 0, padding);
3273                 pr_debug("Attaching %u additional bytes for"
3274                         " padding.\n", padding);
3275         }
3276
3277         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3278         memset(hdr, 0, ISCSI_HDR_LEN);
3279         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3280         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3281         hton24(hdr->dlength, text_length);
3282         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3283         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3284         cmd->stat_sn            = conn->stat_sn++;
3285         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3286
3287         iscsit_increment_maxcmdsn(cmd, conn->sess);
3288         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3289         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3290
3291         iov = &cmd->iov_misc[0];
3292
3293         iov[iov_count].iov_base = cmd->pdu;
3294         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3295         iov[iov_count].iov_base = cmd->buf_ptr;
3296         iov[iov_count++].iov_len = text_length + padding;
3297
3298         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3299
3300         if (conn->conn_ops->HeaderDigest) {
3301                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3302
3303                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3304                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3305                                 0, NULL, (u8 *)header_digest);
3306
3307                 iov[0].iov_len += ISCSI_CRC_LEN;
3308                 tx_size += ISCSI_CRC_LEN;
3309                 pr_debug("Attaching CRC32 HeaderDigest for"
3310                         " Text Response PDU 0x%08x\n", *header_digest);
3311         }
3312
3313         if (conn->conn_ops->DataDigest) {
3314                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3315                                 cmd->buf_ptr, (text_length + padding),
3316                                 0, NULL, (u8 *)&cmd->data_crc);
3317
3318                 iov[iov_count].iov_base = &cmd->data_crc;
3319                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3320                 tx_size += ISCSI_CRC_LEN;
3321
3322                 pr_debug("Attaching DataDigest for %u bytes of text"
3323                         " data, CRC 0x%08x\n", (text_length + padding),
3324                         cmd->data_crc);
3325         }
3326
3327         cmd->iov_misc_count = iov_count;
3328         cmd->tx_size = tx_size;
3329
3330         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3331                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3332                         text_length, conn->cid);
3333         return 0;
3334 }
3335
3336 static int iscsit_send_reject(
3337         struct iscsi_cmd *cmd,
3338         struct iscsi_conn *conn)
3339 {
3340         u32 iov_count = 0, tx_size = 0;
3341         struct iscsi_reject *hdr;
3342         struct kvec *iov;
3343
3344         hdr                     = (struct iscsi_reject *) cmd->pdu;
3345         hdr->opcode             = ISCSI_OP_REJECT;
3346         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3347         hton24(hdr->dlength, ISCSI_HDR_LEN);
3348         cmd->stat_sn            = conn->stat_sn++;
3349         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3350         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3351         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3352
3353         iov = &cmd->iov_misc[0];
3354
3355         iov[iov_count].iov_base = cmd->pdu;
3356         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3357         iov[iov_count].iov_base = cmd->buf_ptr;
3358         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3359
3360         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3361
3362         if (conn->conn_ops->HeaderDigest) {
3363                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3364
3365                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3366                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3367                                 0, NULL, (u8 *)header_digest);
3368
3369                 iov[0].iov_len += ISCSI_CRC_LEN;
3370                 tx_size += ISCSI_CRC_LEN;
3371                 pr_debug("Attaching CRC32 HeaderDigest for"
3372                         " REJECT PDU 0x%08x\n", *header_digest);
3373         }
3374
3375         if (conn->conn_ops->DataDigest) {
3376                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3377                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3378                                 0, NULL, (u8 *)&cmd->data_crc);
3379
3380                 iov[iov_count].iov_base = &cmd->data_crc;
3381                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3382                 tx_size += ISCSI_CRC_LEN;
3383                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3384                                 " PDU 0x%08x\n", cmd->data_crc);
3385         }
3386
3387         cmd->iov_misc_count = iov_count;
3388         cmd->tx_size = tx_size;
3389
3390         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3391                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3392
3393         return 0;
3394 }
3395
3396 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3397 {
3398         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3399             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3400                 wait_for_completion_interruptible_timeout(
3401                                         &conn->tx_half_close_comp,
3402                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3403         }
3404 }
3405
3406 #ifdef CONFIG_SMP
3407
3408 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3409 {
3410         struct iscsi_thread_set *ts = conn->thread_set;
3411         int ord, cpu;
3412         /*
3413          * thread_id is assigned from iscsit_global->ts_bitmap from
3414          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3415          *
3416          * Here we use thread_id to determine which CPU that this
3417          * iSCSI connection's iscsi_thread_set will be scheduled to
3418          * execute upon.
3419          */
3420         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3421 #if 0
3422         pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3423                         " thread_id: %d\n", ord, ts->thread_id);
3424 #endif
3425         for_each_online_cpu(cpu) {
3426                 if (ord-- == 0) {
3427                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3428                         return;
3429                 }
3430         }
3431         /*
3432          * This should never be reached..
3433          */
3434         dump_stack();
3435         cpumask_setall(conn->conn_cpumask);
3436 }
3437
3438 static inline void iscsit_thread_check_cpumask(
3439         struct iscsi_conn *conn,
3440         struct task_struct *p,
3441         int mode)
3442 {
3443         char buf[128];
3444         /*
3445          * mode == 1 signals iscsi_target_tx_thread() usage.
3446          * mode == 0 signals iscsi_target_rx_thread() usage.
3447          */
3448         if (mode == 1) {
3449                 if (!conn->conn_tx_reset_cpumask)
3450                         return;
3451                 conn->conn_tx_reset_cpumask = 0;
3452         } else {
3453                 if (!conn->conn_rx_reset_cpumask)
3454                         return;
3455                 conn->conn_rx_reset_cpumask = 0;
3456         }
3457         /*
3458          * Update the CPU mask for this single kthread so that
3459          * both TX and RX kthreads are scheduled to run on the
3460          * same CPU.
3461          */
3462         memset(buf, 0, 128);
3463         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3464 #if 0
3465         pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3466                         " %s for %s\n", buf, p->comm);
3467 #endif
3468         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3469 }
3470
3471 #else
3472
3473 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3474 {
3475         return;
3476 }
3477
3478 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3479 #endif /* CONFIG_SMP */
3480
3481 int iscsi_target_tx_thread(void *arg)
3482 {
3483         u8 state;
3484         int eodr = 0;
3485         int ret = 0;
3486         int sent_status = 0;
3487         int use_misc = 0;
3488         int map_sg = 0;
3489         struct iscsi_cmd *cmd = NULL;
3490         struct iscsi_conn *conn;
3491         struct iscsi_queue_req *qr = NULL;
3492         struct se_cmd *se_cmd;
3493         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3494         /*
3495          * Allow ourselves to be interrupted by SIGINT so that a
3496          * connection recovery / failure event can be triggered externally.
3497          */
3498         allow_signal(SIGINT);
3499
3500 restart:
3501         conn = iscsi_tx_thread_pre_handler(ts);
3502         if (!conn)
3503                 goto out;
3504
3505         eodr = map_sg = ret = sent_status = use_misc = 0;
3506
3507         while (!kthread_should_stop()) {
3508                 /*
3509                  * Ensure that both TX and RX per connection kthreads
3510                  * are scheduled to run on the same CPU.
3511                  */
3512                 iscsit_thread_check_cpumask(conn, current, 1);
3513
3514                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3515
3516                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3517                      signal_pending(current))
3518                         goto transport_err;
3519
3520 get_immediate:
3521                 qr = iscsit_get_cmd_from_immediate_queue(conn);
3522                 if (qr) {
3523                         atomic_set(&conn->check_immediate_queue, 0);
3524                         cmd = qr->cmd;
3525                         state = qr->state;
3526                         kmem_cache_free(lio_qr_cache, qr);
3527
3528                         spin_lock_bh(&cmd->istate_lock);
3529                         switch (state) {
3530                         case ISTATE_SEND_R2T:
3531                                 spin_unlock_bh(&cmd->istate_lock);
3532                                 ret = iscsit_send_r2t(cmd, conn);
3533                                 break;
3534                         case ISTATE_REMOVE:
3535                                 spin_unlock_bh(&cmd->istate_lock);
3536
3537                                 if (cmd->data_direction == DMA_TO_DEVICE)
3538                                         iscsit_stop_dataout_timer(cmd);
3539
3540                                 spin_lock_bh(&conn->cmd_lock);
3541                                 list_del(&cmd->i_list);
3542                                 spin_unlock_bh(&conn->cmd_lock);
3543
3544                                 iscsit_free_cmd(cmd);
3545                                 goto get_immediate;
3546                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3547                                 spin_unlock_bh(&cmd->istate_lock);
3548                                 iscsit_mod_nopin_response_timer(conn);
3549                                 ret = iscsit_send_unsolicited_nopin(cmd,
3550                                                 conn, 1);
3551                                 break;
3552                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3553                                 spin_unlock_bh(&cmd->istate_lock);
3554                                 ret = iscsit_send_unsolicited_nopin(cmd,
3555                                                 conn, 0);
3556                                 break;
3557                         default:
3558                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3559                                 " 0x%08x, i_state: %d on CID: %hu\n",
3560                                 cmd->iscsi_opcode, cmd->init_task_tag, state,
3561                                 conn->cid);
3562                                 spin_unlock_bh(&cmd->istate_lock);
3563                                 goto transport_err;
3564                         }
3565                         if (ret < 0) {
3566                                 conn->tx_immediate_queue = 0;
3567                                 goto transport_err;
3568                         }
3569
3570                         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3571                                 conn->tx_immediate_queue = 0;
3572                                 iscsit_tx_thread_wait_for_tcp(conn);
3573                                 goto transport_err;
3574                         }
3575
3576                         spin_lock_bh(&cmd->istate_lock);
3577                         switch (state) {
3578                         case ISTATE_SEND_R2T:
3579                                 spin_unlock_bh(&cmd->istate_lock);
3580                                 spin_lock_bh(&cmd->dataout_timeout_lock);
3581                                 iscsit_start_dataout_timer(cmd, conn);
3582                                 spin_unlock_bh(&cmd->dataout_timeout_lock);
3583                                 break;
3584                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3585                                 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3586                                 spin_unlock_bh(&cmd->istate_lock);
3587                                 break;
3588                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3589                                 cmd->i_state = ISTATE_SENT_STATUS;
3590                                 spin_unlock_bh(&cmd->istate_lock);
3591                                 break;
3592                         default:
3593                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3594                                         " 0x%08x, i_state: %d on CID: %hu\n",
3595                                         cmd->iscsi_opcode, cmd->init_task_tag,
3596                                         state, conn->cid);
3597                                 spin_unlock_bh(&cmd->istate_lock);
3598                                 goto transport_err;
3599                         }
3600                         goto get_immediate;
3601                 } else
3602                         conn->tx_immediate_queue = 0;
3603
3604 get_response:
3605                 qr = iscsit_get_cmd_from_response_queue(conn);
3606                 if (qr) {
3607                         cmd = qr->cmd;
3608                         state = qr->state;
3609                         kmem_cache_free(lio_qr_cache, qr);
3610
3611                         spin_lock_bh(&cmd->istate_lock);
3612 check_rsp_state:
3613                         switch (state) {
3614                         case ISTATE_SEND_DATAIN:
3615                                 spin_unlock_bh(&cmd->istate_lock);
3616                                 ret = iscsit_send_data_in(cmd, conn,
3617                                                           &eodr);
3618                                 map_sg = 1;
3619                                 break;
3620                         case ISTATE_SEND_STATUS:
3621                         case ISTATE_SEND_STATUS_RECOVERY:
3622                                 spin_unlock_bh(&cmd->istate_lock);
3623                                 use_misc = 1;
3624                                 ret = iscsit_send_status(cmd, conn);
3625                                 break;
3626                         case ISTATE_SEND_LOGOUTRSP:
3627                                 spin_unlock_bh(&cmd->istate_lock);
3628                                 use_misc = 1;
3629                                 ret = iscsit_send_logout_response(cmd, conn);
3630                                 break;
3631                         case ISTATE_SEND_ASYNCMSG:
3632                                 spin_unlock_bh(&cmd->istate_lock);
3633                                 use_misc = 1;
3634                                 ret = iscsit_send_conn_drop_async_message(
3635                                                 cmd, conn);
3636                                 break;
3637                         case ISTATE_SEND_NOPIN:
3638                                 spin_unlock_bh(&cmd->istate_lock);
3639                                 use_misc = 1;
3640                                 ret = iscsit_send_nopin_response(cmd, conn);
3641                                 break;
3642                         case ISTATE_SEND_REJECT:
3643                                 spin_unlock_bh(&cmd->istate_lock);
3644                                 use_misc = 1;
3645                                 ret = iscsit_send_reject(cmd, conn);
3646                                 break;
3647                         case ISTATE_SEND_TASKMGTRSP:
3648                                 spin_unlock_bh(&cmd->istate_lock);
3649                                 use_misc = 1;
3650                                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3651                                 if (ret != 0)
3652                                         break;
3653                                 ret = iscsit_tmr_post_handler(cmd, conn);
3654                                 if (ret != 0)
3655                                         iscsit_fall_back_to_erl0(conn->sess);
3656                                 break;
3657                         case ISTATE_SEND_TEXTRSP:
3658                                 spin_unlock_bh(&cmd->istate_lock);
3659                                 use_misc = 1;
3660                                 ret = iscsit_send_text_rsp(cmd, conn);
3661                                 break;
3662                         default:
3663                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3664                                         " 0x%08x, i_state: %d on CID: %hu\n",
3665                                         cmd->iscsi_opcode, cmd->init_task_tag,
3666                                         state, conn->cid);
3667                                 spin_unlock_bh(&cmd->istate_lock);
3668                                 goto transport_err;
3669                         }
3670                         if (ret < 0) {
3671                                 conn->tx_response_queue = 0;
3672                                 goto transport_err;
3673                         }
3674
3675                         se_cmd = &cmd->se_cmd;
3676
3677                         if (map_sg && !conn->conn_ops->IFMarker) {
3678                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3679                                         conn->tx_response_queue = 0;
3680                                         iscsit_tx_thread_wait_for_tcp(conn);
3681                                         iscsit_unmap_iovec(cmd);
3682                                         goto transport_err;
3683                                 }
3684                         } else {
3685                                 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3686                                         conn->tx_response_queue = 0;
3687                                         iscsit_tx_thread_wait_for_tcp(conn);
3688                                         iscsit_unmap_iovec(cmd);
3689                                         goto transport_err;
3690                                 }
3691                         }
3692                         map_sg = 0;
3693                         iscsit_unmap_iovec(cmd);
3694
3695                         spin_lock_bh(&cmd->istate_lock);
3696                         switch (state) {
3697                         case ISTATE_SEND_DATAIN:
3698                                 if (!eodr)
3699                                         goto check_rsp_state;
3700
3701                                 if (eodr == 1) {
3702                                         cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3703                                         sent_status = 1;
3704                                         eodr = use_misc = 0;
3705                                 } else if (eodr == 2) {
3706                                         cmd->i_state = state =
3707                                                         ISTATE_SEND_STATUS;
3708                                         sent_status = 0;
3709                                         eodr = use_misc = 0;
3710                                         goto check_rsp_state;
3711                                 }
3712                                 break;
3713                         case ISTATE_SEND_STATUS:
3714                                 use_misc = 0;
3715                                 sent_status = 1;
3716                                 break;
3717                         case ISTATE_SEND_ASYNCMSG:
3718                         case ISTATE_SEND_NOPIN:
3719                         case ISTATE_SEND_STATUS_RECOVERY:
3720                         case ISTATE_SEND_TEXTRSP:
3721                                 use_misc = 0;
3722                                 sent_status = 1;
3723                                 break;
3724                         case ISTATE_SEND_REJECT:
3725                                 use_misc = 0;
3726                                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3727                                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3728                                         spin_unlock_bh(&cmd->istate_lock);
3729                                         complete(&cmd->reject_comp);
3730                                         goto transport_err;
3731                                 }
3732                                 complete(&cmd->reject_comp);
3733                                 break;
3734                         case ISTATE_SEND_TASKMGTRSP:
3735                                 use_misc = 0;
3736                                 sent_status = 1;
3737                                 break;
3738                         case ISTATE_SEND_LOGOUTRSP:
3739                                 spin_unlock_bh(&cmd->istate_lock);
3740                                 if (!iscsit_logout_post_handler(cmd, conn))
3741                                         goto restart;
3742                                 spin_lock_bh(&cmd->istate_lock);
3743                                 use_misc = 0;
3744                                 sent_status = 1;
3745                                 break;
3746                         default:
3747                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3748                                         " 0x%08x, i_state: %d on CID: %hu\n",
3749                                         cmd->iscsi_opcode, cmd->init_task_tag,
3750                                         cmd->i_state, conn->cid);
3751                                 spin_unlock_bh(&cmd->istate_lock);
3752                                 goto transport_err;
3753                         }
3754
3755                         if (sent_status) {
3756                                 cmd->i_state = ISTATE_SENT_STATUS;
3757                                 sent_status = 0;
3758                         }
3759                         spin_unlock_bh(&cmd->istate_lock);
3760
3761                         if (atomic_read(&conn->check_immediate_queue))
3762                                 goto get_immediate;
3763
3764                         goto get_response;
3765                 } else
3766                         conn->tx_response_queue = 0;
3767         }
3768
3769 transport_err:
3770         iscsit_take_action_for_connection_exit(conn);
3771         goto restart;
3772 out:
3773         return 0;
3774 }
3775
3776 int iscsi_target_rx_thread(void *arg)
3777 {
3778         int ret;
3779         u8 buffer[ISCSI_HDR_LEN], opcode;
3780         u32 checksum = 0, digest = 0;
3781         struct iscsi_conn *conn = NULL;
3782         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3783         struct kvec iov;
3784         /*
3785          * Allow ourselves to be interrupted by SIGINT so that a
3786          * connection recovery / failure event can be triggered externally.
3787          */
3788         allow_signal(SIGINT);
3789
3790 restart:
3791         conn = iscsi_rx_thread_pre_handler(ts);
3792         if (!conn)
3793                 goto out;
3794
3795         while (!kthread_should_stop()) {
3796                 /*
3797                  * Ensure that both TX and RX per connection kthreads
3798                  * are scheduled to run on the same CPU.
3799                  */
3800                 iscsit_thread_check_cpumask(conn, current, 0);
3801
3802                 memset(buffer, 0, ISCSI_HDR_LEN);
3803                 memset(&iov, 0, sizeof(struct kvec));
3804
3805                 iov.iov_base    = buffer;
3806                 iov.iov_len     = ISCSI_HDR_LEN;
3807
3808                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3809                 if (ret != ISCSI_HDR_LEN) {
3810                         iscsit_rx_thread_wait_for_tcp(conn);
3811                         goto transport_err;
3812                 }
3813
3814                 /*
3815                  * Set conn->bad_hdr for use with REJECT PDUs.
3816                  */
3817                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3818
3819                 if (conn->conn_ops->HeaderDigest) {
3820                         iov.iov_base    = &digest;
3821                         iov.iov_len     = ISCSI_CRC_LEN;
3822
3823                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3824                         if (ret != ISCSI_CRC_LEN) {
3825                                 iscsit_rx_thread_wait_for_tcp(conn);
3826                                 goto transport_err;
3827                         }
3828
3829                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3830                                         buffer, ISCSI_HDR_LEN,
3831                                         0, NULL, (u8 *)&checksum);
3832
3833                         if (digest != checksum) {
3834                                 pr_err("HeaderDigest CRC32C failed,"
3835                                         " received 0x%08x, computed 0x%08x\n",
3836                                         digest, checksum);
3837                                 /*
3838                                  * Set the PDU to 0xff so it will intentionally
3839                                  * hit default in the switch below.
3840                                  */
3841                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3842                                 spin_lock_bh(&conn->sess->session_stats_lock);
3843                                 conn->sess->conn_digest_errors++;
3844                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3845                         } else {
3846                                 pr_debug("Got HeaderDigest CRC32C"
3847                                                 " 0x%08x\n", checksum);
3848                         }
3849                 }
3850
3851                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3852                         goto transport_err;
3853
3854                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3855
3856                 if (conn->sess->sess_ops->SessionType &&
3857                    ((!(opcode & ISCSI_OP_TEXT)) ||
3858                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3859                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3860                         " while in Discovery Session, rejecting.\n", opcode);
3861                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3862                                         buffer, conn);
3863                         goto transport_err;
3864                 }
3865
3866                 switch (opcode) {
3867                 case ISCSI_OP_SCSI_CMD:
3868                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3869                                 goto transport_err;
3870                         break;
3871                 case ISCSI_OP_SCSI_DATA_OUT:
3872                         if (iscsit_handle_data_out(conn, buffer) < 0)
3873                                 goto transport_err;
3874                         break;
3875                 case ISCSI_OP_NOOP_OUT:
3876                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3877                                 goto transport_err;
3878                         break;
3879                 case ISCSI_OP_SCSI_TMFUNC:
3880                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3881                                 goto transport_err;
3882                         break;
3883                 case ISCSI_OP_TEXT:
3884                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3885                                 goto transport_err;
3886                         break;
3887                 case ISCSI_OP_LOGOUT:
3888                         ret = iscsit_handle_logout_cmd(conn, buffer);
3889                         if (ret > 0) {
3890                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3891                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3892                                 goto transport_err;
3893                         } else if (ret < 0)
3894                                 goto transport_err;
3895                         break;
3896                 case ISCSI_OP_SNACK:
3897                         if (iscsit_handle_snack(conn, buffer) < 0)
3898                                 goto transport_err;
3899                         break;
3900                 default:
3901                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3902                                         opcode);
3903                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3904                                 pr_err("Cannot recover from unknown"
3905                                 " opcode while ERL=0, closing iSCSI connection"
3906                                 ".\n");
3907                                 goto transport_err;
3908                         }
3909                         if (!conn->conn_ops->OFMarker) {
3910                                 pr_err("Unable to recover from unknown"
3911                                 " opcode while OFMarker=No, closing iSCSI"
3912                                         " connection.\n");
3913                                 goto transport_err;
3914                         }
3915                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3916                                 pr_err("Unable to recover from unknown"
3917                                         " opcode, closing iSCSI connection.\n");
3918                                 goto transport_err;
3919                         }
3920                         break;
3921                 }
3922         }
3923
3924 transport_err:
3925         if (!signal_pending(current))
3926                 atomic_set(&conn->transport_failed, 1);
3927         iscsit_take_action_for_connection_exit(conn);
3928         goto restart;
3929 out:
3930         return 0;
3931 }
3932
3933 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3934 {
3935         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3936         struct iscsi_session *sess = conn->sess;
3937         /*
3938          * We expect this function to only ever be called from either RX or TX
3939          * thread context via iscsit_close_connection() once the other context
3940          * has been reset -> returned sleeping pre-handler state.
3941          */
3942         spin_lock_bh(&conn->cmd_lock);
3943         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3944
3945                 list_del(&cmd->i_list);
3946                 spin_unlock_bh(&conn->cmd_lock);
3947
3948                 iscsit_increment_maxcmdsn(cmd, sess);
3949
3950                 iscsit_free_cmd(cmd);
3951
3952                 spin_lock_bh(&conn->cmd_lock);
3953         }
3954         spin_unlock_bh(&conn->cmd_lock);
3955 }
3956
3957 static void iscsit_stop_timers_for_cmds(
3958         struct iscsi_conn *conn)
3959 {
3960         struct iscsi_cmd *cmd;
3961
3962         spin_lock_bh(&conn->cmd_lock);
3963         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3964                 if (cmd->data_direction == DMA_TO_DEVICE)
3965                         iscsit_stop_dataout_timer(cmd);
3966         }
3967         spin_unlock_bh(&conn->cmd_lock);
3968 }
3969
3970 int iscsit_close_connection(
3971         struct iscsi_conn *conn)
3972 {
3973         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3974         struct iscsi_session    *sess = conn->sess;
3975
3976         pr_debug("Closing iSCSI connection CID %hu on SID:"
3977                 " %u\n", conn->cid, sess->sid);
3978         /*
3979          * Always up conn_logout_comp just in case the RX Thread is sleeping
3980          * and the logout response never got sent because the connection
3981          * failed.
3982          */
3983         complete(&conn->conn_logout_comp);
3984
3985         iscsi_release_thread_set(conn);
3986
3987         iscsit_stop_timers_for_cmds(conn);
3988         iscsit_stop_nopin_response_timer(conn);
3989         iscsit_stop_nopin_timer(conn);
3990         iscsit_free_queue_reqs_for_conn(conn);
3991
3992         /*
3993          * During Connection recovery drop unacknowledged out of order
3994          * commands for this connection, and prepare the other commands
3995          * for realligence.
3996          *
3997          * During normal operation clear the out of order commands (but
3998          * do not free the struct iscsi_ooo_cmdsn's) and release all
3999          * struct iscsi_cmds.
4000          */
4001         if (atomic_read(&conn->connection_recovery)) {
4002                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4003                 iscsit_prepare_cmds_for_realligance(conn);
4004         } else {
4005                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4006                 iscsit_release_commands_from_conn(conn);
4007         }
4008
4009         /*
4010          * Handle decrementing session or connection usage count if
4011          * a logout response was not able to be sent because the
4012          * connection failed.  Fall back to Session Recovery here.
4013          */
4014         if (atomic_read(&conn->conn_logout_remove)) {
4015                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4016                         iscsit_dec_conn_usage_count(conn);
4017                         iscsit_dec_session_usage_count(sess);
4018                 }
4019                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4020                         iscsit_dec_conn_usage_count(conn);
4021
4022                 atomic_set(&conn->conn_logout_remove, 0);
4023                 atomic_set(&sess->session_reinstatement, 0);
4024                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4025         }
4026
4027         spin_lock_bh(&sess->conn_lock);
4028         list_del(&conn->conn_list);
4029
4030         /*
4031          * Attempt to let the Initiator know this connection failed by
4032          * sending an Connection Dropped Async Message on another
4033          * active connection.
4034          */
4035         if (atomic_read(&conn->connection_recovery))
4036                 iscsit_build_conn_drop_async_message(conn);
4037
4038         spin_unlock_bh(&sess->conn_lock);
4039
4040         /*
4041          * If connection reinstatement is being performed on this connection,
4042          * up the connection reinstatement semaphore that is being blocked on
4043          * in iscsit_cause_connection_reinstatement().
4044          */
4045         spin_lock_bh(&conn->state_lock);
4046         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4047                 spin_unlock_bh(&conn->state_lock);
4048                 complete(&conn->conn_wait_comp);
4049                 wait_for_completion(&conn->conn_post_wait_comp);
4050                 spin_lock_bh(&conn->state_lock);
4051         }
4052
4053         /*
4054          * If connection reinstatement is being performed on this connection
4055          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4056          * connection wait rcfr semaphore that is being blocked on
4057          * an iscsit_connection_reinstatement_rcfr().
4058          */
4059         if (atomic_read(&conn->connection_wait_rcfr)) {
4060                 spin_unlock_bh(&conn->state_lock);
4061                 complete(&conn->conn_wait_rcfr_comp);
4062                 wait_for_completion(&conn->conn_post_wait_comp);
4063                 spin_lock_bh(&conn->state_lock);
4064         }
4065         atomic_set(&conn->connection_reinstatement, 1);
4066         spin_unlock_bh(&conn->state_lock);
4067
4068         /*
4069          * If any other processes are accessing this connection pointer we
4070          * must wait until they have completed.
4071          */
4072         iscsit_check_conn_usage_count(conn);
4073
4074         if (conn->conn_rx_hash.tfm)
4075                 crypto_free_hash(conn->conn_rx_hash.tfm);
4076         if (conn->conn_tx_hash.tfm)
4077                 crypto_free_hash(conn->conn_tx_hash.tfm);
4078
4079         if (conn->conn_cpumask)
4080                 free_cpumask_var(conn->conn_cpumask);
4081
4082         kfree(conn->conn_ops);
4083         conn->conn_ops = NULL;
4084
4085         if (conn->sock) {
4086                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4087                         kfree(conn->sock->file);
4088                         conn->sock->file = NULL;
4089                 }
4090                 sock_release(conn->sock);
4091         }
4092         conn->thread_set = NULL;
4093
4094         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4095         conn->conn_state = TARG_CONN_STATE_FREE;
4096         kfree(conn);
4097
4098         spin_lock_bh(&sess->conn_lock);
4099         atomic_dec(&sess->nconn);
4100         pr_debug("Decremented iSCSI connection count to %hu from node:"
4101                 " %s\n", atomic_read(&sess->nconn),
4102                 sess->sess_ops->InitiatorName);
4103         /*
4104          * Make sure that if one connection fails in an non ERL=2 iSCSI
4105          * Session that they all fail.
4106          */
4107         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4108              !atomic_read(&sess->session_logout))
4109                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4110
4111         /*
4112          * If this was not the last connection in the session, and we are
4113          * performing session reinstatement or falling back to ERL=0, call
4114          * iscsit_stop_session() without sleeping to shutdown the other
4115          * active connections.
4116          */
4117         if (atomic_read(&sess->nconn)) {
4118                 if (!atomic_read(&sess->session_reinstatement) &&
4119                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4120                         spin_unlock_bh(&sess->conn_lock);
4121                         return 0;
4122                 }
4123                 if (!atomic_read(&sess->session_stop_active)) {
4124                         atomic_set(&sess->session_stop_active, 1);
4125                         spin_unlock_bh(&sess->conn_lock);
4126                         iscsit_stop_session(sess, 0, 0);
4127                         return 0;
4128                 }
4129                 spin_unlock_bh(&sess->conn_lock);
4130                 return 0;
4131         }
4132
4133         /*
4134          * If this was the last connection in the session and one of the
4135          * following is occurring:
4136          *
4137          * Session Reinstatement is not being performed, and are falling back
4138          * to ERL=0 call iscsit_close_session().
4139          *
4140          * Session Logout was requested.  iscsit_close_session() will be called
4141          * elsewhere.
4142          *
4143          * Session Continuation is not being performed, start the Time2Retain
4144          * handler and check if sleep_on_sess_wait_sem is active.
4145          */
4146         if (!atomic_read(&sess->session_reinstatement) &&
4147              atomic_read(&sess->session_fall_back_to_erl0)) {
4148                 spin_unlock_bh(&sess->conn_lock);
4149                 iscsit_close_session(sess);
4150
4151                 return 0;
4152         } else if (atomic_read(&sess->session_logout)) {
4153                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4154                 sess->session_state = TARG_SESS_STATE_FREE;
4155                 spin_unlock_bh(&sess->conn_lock);
4156
4157                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4158                         complete(&sess->session_wait_comp);
4159
4160                 return 0;
4161         } else {
4162                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4163                 sess->session_state = TARG_SESS_STATE_FAILED;
4164
4165                 if (!atomic_read(&sess->session_continuation)) {
4166                         spin_unlock_bh(&sess->conn_lock);
4167                         iscsit_start_time2retain_handler(sess);
4168                 } else
4169                         spin_unlock_bh(&sess->conn_lock);
4170
4171                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4172                         complete(&sess->session_wait_comp);
4173
4174                 return 0;
4175         }
4176         spin_unlock_bh(&sess->conn_lock);
4177
4178         return 0;
4179 }
4180
4181 int iscsit_close_session(struct iscsi_session *sess)
4182 {
4183         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4184         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4185
4186         if (atomic_read(&sess->nconn)) {
4187                 pr_err("%d connection(s) still exist for iSCSI session"
4188                         " to %s\n", atomic_read(&sess->nconn),
4189                         sess->sess_ops->InitiatorName);
4190                 BUG();
4191         }
4192
4193         spin_lock_bh(&se_tpg->session_lock);
4194         atomic_set(&sess->session_logout, 1);
4195         atomic_set(&sess->session_reinstatement, 1);
4196         iscsit_stop_time2retain_timer(sess);
4197         spin_unlock_bh(&se_tpg->session_lock);
4198
4199         /*
4200          * transport_deregister_session_configfs() will clear the
4201          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4202          * can be setting it again with __transport_register_session() in
4203          * iscsi_post_login_handler() again after the iscsit_stop_session()
4204          * completes in iscsi_np context.
4205          */
4206         transport_deregister_session_configfs(sess->se_sess);
4207
4208         /*
4209          * If any other processes are accessing this session pointer we must
4210          * wait until they have completed.  If we are in an interrupt (the
4211          * time2retain handler) and contain and active session usage count we
4212          * restart the timer and exit.
4213          */
4214         if (!in_interrupt()) {
4215                 if (iscsit_check_session_usage_count(sess) == 1)
4216                         iscsit_stop_session(sess, 1, 1);
4217         } else {
4218                 if (iscsit_check_session_usage_count(sess) == 2) {
4219                         atomic_set(&sess->session_logout, 0);
4220                         iscsit_start_time2retain_handler(sess);
4221                         return 0;
4222                 }
4223         }
4224
4225         transport_deregister_session(sess->se_sess);
4226
4227         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4228                 iscsit_free_connection_recovery_entires(sess);
4229
4230         iscsit_free_all_ooo_cmdsns(sess);
4231
4232         spin_lock_bh(&se_tpg->session_lock);
4233         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4234         sess->session_state = TARG_SESS_STATE_FREE;
4235         pr_debug("Released iSCSI session from node: %s\n",
4236                         sess->sess_ops->InitiatorName);
4237         tpg->nsessions--;
4238         if (tpg->tpg_tiqn)
4239                 tpg->tpg_tiqn->tiqn_nsessions--;
4240
4241         pr_debug("Decremented number of active iSCSI Sessions on"
4242                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4243
4244         spin_lock(&sess_idr_lock);
4245         idr_remove(&sess_idr, sess->session_index);
4246         spin_unlock(&sess_idr_lock);
4247
4248         kfree(sess->sess_ops);
4249         sess->sess_ops = NULL;
4250         spin_unlock_bh(&se_tpg->session_lock);
4251
4252         kfree(sess);
4253         return 0;
4254 }
4255
4256 static void iscsit_logout_post_handler_closesession(
4257         struct iscsi_conn *conn)
4258 {
4259         struct iscsi_session *sess = conn->sess;
4260
4261         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4262         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4263
4264         atomic_set(&conn->conn_logout_remove, 0);
4265         complete(&conn->conn_logout_comp);
4266
4267         iscsit_dec_conn_usage_count(conn);
4268         iscsit_stop_session(sess, 1, 1);
4269         iscsit_dec_session_usage_count(sess);
4270         iscsit_close_session(sess);
4271 }
4272
4273 static void iscsit_logout_post_handler_samecid(
4274         struct iscsi_conn *conn)
4275 {
4276         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4277         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4278
4279         atomic_set(&conn->conn_logout_remove, 0);
4280         complete(&conn->conn_logout_comp);
4281
4282         iscsit_cause_connection_reinstatement(conn, 1);
4283         iscsit_dec_conn_usage_count(conn);
4284 }
4285
4286 static void iscsit_logout_post_handler_diffcid(
4287         struct iscsi_conn *conn,
4288         u16 cid)
4289 {
4290         struct iscsi_conn *l_conn;
4291         struct iscsi_session *sess = conn->sess;
4292
4293         if (!sess)
4294                 return;
4295
4296         spin_lock_bh(&sess->conn_lock);
4297         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4298                 if (l_conn->cid == cid) {
4299                         iscsit_inc_conn_usage_count(l_conn);
4300                         break;
4301                 }
4302         }
4303         spin_unlock_bh(&sess->conn_lock);
4304
4305         if (!l_conn)
4306                 return;
4307
4308         if (l_conn->sock)
4309                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4310
4311         spin_lock_bh(&l_conn->state_lock);
4312         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4313         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4314         spin_unlock_bh(&l_conn->state_lock);
4315
4316         iscsit_cause_connection_reinstatement(l_conn, 1);
4317         iscsit_dec_conn_usage_count(l_conn);
4318 }
4319
4320 /*
4321  *      Return of 0 causes the TX thread to restart.
4322  */
4323 static int iscsit_logout_post_handler(
4324         struct iscsi_cmd *cmd,
4325         struct iscsi_conn *conn)
4326 {
4327         int ret = 0;
4328
4329         switch (cmd->logout_reason) {
4330         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4331                 switch (cmd->logout_response) {
4332                 case ISCSI_LOGOUT_SUCCESS:
4333                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4334                 default:
4335                         iscsit_logout_post_handler_closesession(conn);
4336                         break;
4337                 }
4338                 ret = 0;
4339                 break;
4340         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4341                 if (conn->cid == cmd->logout_cid) {
4342                         switch (cmd->logout_response) {
4343                         case ISCSI_LOGOUT_SUCCESS:
4344                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4345                         default:
4346                                 iscsit_logout_post_handler_samecid(conn);
4347                                 break;
4348                         }
4349                         ret = 0;
4350                 } else {
4351                         switch (cmd->logout_response) {
4352                         case ISCSI_LOGOUT_SUCCESS:
4353                                 iscsit_logout_post_handler_diffcid(conn,
4354                                         cmd->logout_cid);
4355                                 break;
4356                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4357                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4358                         default:
4359                                 break;
4360                         }
4361                         ret = 1;
4362                 }
4363                 break;
4364         case ISCSI_LOGOUT_REASON_RECOVERY:
4365                 switch (cmd->logout_response) {
4366                 case ISCSI_LOGOUT_SUCCESS:
4367                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4368                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4369                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4370                 default:
4371                         break;
4372                 }
4373                 ret = 1;
4374                 break;
4375         default:
4376                 break;
4377
4378         }
4379         return ret;
4380 }
4381
4382 void iscsit_fail_session(struct iscsi_session *sess)
4383 {
4384         struct iscsi_conn *conn;
4385
4386         spin_lock_bh(&sess->conn_lock);
4387         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4388                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4389                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4390         }
4391         spin_unlock_bh(&sess->conn_lock);
4392
4393         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4394         sess->session_state = TARG_SESS_STATE_FAILED;
4395 }
4396
4397 int iscsit_free_session(struct iscsi_session *sess)
4398 {
4399         u16 conn_count = atomic_read(&sess->nconn);
4400         struct iscsi_conn *conn, *conn_tmp = NULL;
4401         int is_last;
4402
4403         spin_lock_bh(&sess->conn_lock);
4404         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4405
4406         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4407                         conn_list) {
4408                 if (conn_count == 0)
4409                         break;
4410
4411                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4412                         is_last = 1;
4413                 } else {
4414                         iscsit_inc_conn_usage_count(conn_tmp);
4415                         is_last = 0;
4416                 }
4417                 iscsit_inc_conn_usage_count(conn);
4418
4419                 spin_unlock_bh(&sess->conn_lock);
4420                 iscsit_cause_connection_reinstatement(conn, 1);
4421                 spin_lock_bh(&sess->conn_lock);
4422
4423                 iscsit_dec_conn_usage_count(conn);
4424                 if (is_last == 0)
4425                         iscsit_dec_conn_usage_count(conn_tmp);
4426
4427                 conn_count--;
4428         }
4429
4430         if (atomic_read(&sess->nconn)) {
4431                 spin_unlock_bh(&sess->conn_lock);
4432                 wait_for_completion(&sess->session_wait_comp);
4433         } else
4434                 spin_unlock_bh(&sess->conn_lock);
4435
4436         iscsit_close_session(sess);
4437         return 0;
4438 }
4439
4440 void iscsit_stop_session(
4441         struct iscsi_session *sess,
4442         int session_sleep,
4443         int connection_sleep)
4444 {
4445         u16 conn_count = atomic_read(&sess->nconn);
4446         struct iscsi_conn *conn, *conn_tmp = NULL;
4447         int is_last;
4448
4449         spin_lock_bh(&sess->conn_lock);
4450         if (session_sleep)
4451                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4452
4453         if (connection_sleep) {
4454                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4455                                 conn_list) {
4456                         if (conn_count == 0)
4457                                 break;
4458
4459                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4460                                 is_last = 1;
4461                         } else {
4462                                 iscsit_inc_conn_usage_count(conn_tmp);
4463                                 is_last = 0;
4464                         }
4465                         iscsit_inc_conn_usage_count(conn);
4466
4467                         spin_unlock_bh(&sess->conn_lock);
4468                         iscsit_cause_connection_reinstatement(conn, 1);
4469                         spin_lock_bh(&sess->conn_lock);
4470
4471                         iscsit_dec_conn_usage_count(conn);
4472                         if (is_last == 0)
4473                                 iscsit_dec_conn_usage_count(conn_tmp);
4474                         conn_count--;
4475                 }
4476         } else {
4477                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4478                         iscsit_cause_connection_reinstatement(conn, 0);
4479         }
4480
4481         if (session_sleep && atomic_read(&sess->nconn)) {
4482                 spin_unlock_bh(&sess->conn_lock);
4483                 wait_for_completion(&sess->session_wait_comp);
4484         } else
4485                 spin_unlock_bh(&sess->conn_lock);
4486 }
4487
4488 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4489 {
4490         struct iscsi_session *sess;
4491         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4492         struct se_session *se_sess, *se_sess_tmp;
4493         int session_count = 0;
4494
4495         spin_lock_bh(&se_tpg->session_lock);
4496         if (tpg->nsessions && !force) {
4497                 spin_unlock_bh(&se_tpg->session_lock);
4498                 return -1;
4499         }
4500
4501         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4502                         sess_list) {
4503                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4504
4505                 spin_lock(&sess->conn_lock);
4506                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4507                     atomic_read(&sess->session_logout) ||
4508                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4509                         spin_unlock(&sess->conn_lock);
4510                         continue;
4511                 }
4512                 atomic_set(&sess->session_reinstatement, 1);
4513                 spin_unlock(&sess->conn_lock);
4514                 spin_unlock_bh(&se_tpg->session_lock);
4515
4516                 iscsit_free_session(sess);
4517                 spin_lock_bh(&se_tpg->session_lock);
4518
4519                 session_count++;
4520         }
4521         spin_unlock_bh(&se_tpg->session_lock);
4522
4523         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4524                         " Group: %hu\n", session_count, tpg->tpgt);
4525         return 0;
4526 }
4527
4528 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4529 MODULE_VERSION("4.1.x");
4530 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4531 MODULE_LICENSE("GPL");
4532
4533 module_init(iscsi_target_init_module);
4534 module_exit(iscsi_target_cleanup_module);