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 <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_tmr.h>
  30 #include <target/target_core_transport.h>
  31
  32 #include "iscsi_target_core.h"
  33 #include "iscsi_target_parameters.h"
  34 #include "iscsi_target_seq_pdu_list.h"
  35 #include "iscsi_target_tq.h"
  36 #include "iscsi_target_configfs.h"
  37 #include "iscsi_target_datain_values.h"
  38 #include "iscsi_target_erl0.h"
  39 #include "iscsi_target_erl1.h"
  40 #include "iscsi_target_erl2.h"
  41 #include "iscsi_target_login.h"
  42 #include "iscsi_target_tmr.h"
  43 #include "iscsi_target_tpg.h"
  44 #include "iscsi_target_util.h"
  45 #include "iscsi_target.h"
  46 #include "iscsi_target_device.h"
  47 #include "iscsi_target_stat.h"
  48
  49 static LIST_HEAD(g_tiqn_list);
  50 static LIST_HEAD(g_np_list);
  51 static DEFINE_SPINLOCK(tiqn_lock);
  52 static DEFINE_SPINLOCK(np_lock);
  53
  54 static struct idr tiqn_idr;
  55 struct idr sess_idr;
  56 struct mutex auth_id_lock;
  57 spinlock_t sess_idr_lock;
  58
  59 struct iscsit_global *iscsit_global;
  60
  61 struct kmem_cache *lio_cmd_cache;
  62 struct kmem_cache *lio_qr_cache;
  63 struct kmem_cache *lio_dr_cache;
  64 struct kmem_cache *lio_ooo_cache;
  65 struct kmem_cache *lio_r2t_cache;
  66
  67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  68                         unsigned char *buf, u32);
  69 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  70
  71 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  72 {
  73         struct iscsi_tiqn *tiqn = NULL;
  74
  75         spin_lock(&tiqn_lock);
  76         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  77                 if (!strcmp(tiqn->tiqn, buf)) {
  78
  79                         spin_lock(&tiqn->tiqn_state_lock);
  80                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  81                                 tiqn->tiqn_access_count++;
  82                                 spin_unlock(&tiqn->tiqn_state_lock);
  83                                 spin_unlock(&tiqn_lock);
  84                                 return tiqn;
  85                         }
  86                         spin_unlock(&tiqn->tiqn_state_lock);
  87                 }
  88         }
  89         spin_unlock(&tiqn_lock);
  90
  91         return NULL;
  92 }
  93
  94 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  95 {
  96         spin_lock(&tiqn->tiqn_state_lock);
  97         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  98                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  99                 spin_unlock(&tiqn->tiqn_state_lock);
 100                 return 0;
 101         }
 102         spin_unlock(&tiqn->tiqn_state_lock);
 103
 104         return -1;
 105 }
 106
 107 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 108 {
 109         spin_lock(&tiqn->tiqn_state_lock);
 110         tiqn->tiqn_access_count--;
 111         spin_unlock(&tiqn->tiqn_state_lock);
 112 }
 113
 114 /*
 115  * Note that IQN formatting is expected to be done in userspace, and
 116  * no explict IQN format checks are done here.
 117  */
 118 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 119 {
 120         struct iscsi_tiqn *tiqn = NULL;
 121         int ret;
 122
 123         if (strlen(buf) >= ISCSI_IQN_LEN) {
 124                 pr_err("Target IQN exceeds %d bytes\n",
 125                                 ISCSI_IQN_LEN);
 126                 return ERR_PTR(-EINVAL);
 127         }
 128
 129         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 130         if (!tiqn) {
 131                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 132                 return ERR_PTR(-ENOMEM);
 133         }
 134
 135         sprintf(tiqn->tiqn, "%s", buf);
 136         INIT_LIST_HEAD(&tiqn->tiqn_list);
 137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 138         spin_lock_init(&tiqn->tiqn_state_lock);
 139         spin_lock_init(&tiqn->tiqn_tpg_lock);
 140         spin_lock_init(&tiqn->sess_err_stats.lock);
 141         spin_lock_init(&tiqn->login_stats.lock);
 142         spin_lock_init(&tiqn->logout_stats.lock);
 143
 144         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 145                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 146                 kfree(tiqn);
 147                 return ERR_PTR(-ENOMEM);
 148         }
 149         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 150
 151         spin_lock(&tiqn_lock);
 152         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 153         if (ret < 0) {
 154                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 155                 spin_unlock(&tiqn_lock);
 156                 kfree(tiqn);
 157                 return ERR_PTR(ret);
 158         }
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160         spin_unlock(&tiqn_lock);
 161
 162         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 163
 164         return tiqn;
 165
 166 }
 167
 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 169 {
 170         /*
 171          * Wait for accesses to said struct iscsi_tiqn to end.
 172          */
 173         spin_lock(&tiqn->tiqn_state_lock);
 174         while (tiqn->tiqn_access_count != 0) {
 175                 spin_unlock(&tiqn->tiqn_state_lock);
 176                 msleep(10);
 177                 spin_lock(&tiqn->tiqn_state_lock);
 178         }
 179         spin_unlock(&tiqn->tiqn_state_lock);
 180 }
 181
 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 183 {
 184         /*
 185          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 186          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 187          * attempts to access this struct iscsi_tiqn will fail from both transport
 188          * fabric and control code paths.
 189          */
 190         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 191                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 192                 return;
 193         }
 194
 195         iscsit_wait_for_tiqn(tiqn);
 196
 197         spin_lock(&tiqn_lock);
 198         list_del(&tiqn->tiqn_list);
 199         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 200         spin_unlock(&tiqn_lock);
 201
 202         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 203                         tiqn->tiqn);
 204         kfree(tiqn);
 205 }
 206
 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 208 {
 209         int ret;
 210         /*
 211          * Determine if the network portal is accepting storage traffic.
 212          */
 213         spin_lock_bh(&np->np_thread_lock);
 214         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 215                 spin_unlock_bh(&np->np_thread_lock);
 216                 return -1;
 217         }
 218         if (np->np_login_tpg) {
 219                 pr_err("np->np_login_tpg() is not NULL!\n");
 220                 spin_unlock_bh(&np->np_thread_lock);
 221                 return -1;
 222         }
 223         spin_unlock_bh(&np->np_thread_lock);
 224         /*
 225          * Determine if the portal group is accepting storage traffic.
 226          */
 227         spin_lock_bh(&tpg->tpg_state_lock);
 228         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 229                 spin_unlock_bh(&tpg->tpg_state_lock);
 230                 return -1;
 231         }
 232         spin_unlock_bh(&tpg->tpg_state_lock);
 233
 234         /*
 235          * Here we serialize access across the TIQN+TPG Tuple.
 236          */
 237         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 238         if ((ret != 0) || signal_pending(current))
 239                 return -1;
 240
 241         spin_lock_bh(&np->np_thread_lock);
 242         np->np_login_tpg = tpg;
 243         spin_unlock_bh(&np->np_thread_lock);
 244
 245         return 0;
 246 }
 247
 248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 249 {
 250         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 251
 252         spin_lock_bh(&np->np_thread_lock);
 253         np->np_login_tpg = NULL;
 254         spin_unlock_bh(&np->np_thread_lock);
 255
 256         mutex_unlock(&tpg->np_login_lock);
 257
 258         if (tiqn)
 259                 iscsit_put_tiqn_for_login(tiqn);
 260
 261         return 0;
 262 }
 263
 264 static struct iscsi_np *iscsit_get_np(
 265         struct __kernel_sockaddr_storage *sockaddr,
 266         int network_transport)
 267 {
 268         struct sockaddr_in *sock_in, *sock_in_e;
 269         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 270         struct iscsi_np *np;
 271         int ip_match = 0;
 272         u16 port;
 273
 274         spin_lock_bh(&np_lock);
 275         list_for_each_entry(np, &g_np_list, np_list) {
 276                 spin_lock(&np->np_thread_lock);
 277                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 278                         spin_unlock(&np->np_thread_lock);
 279                         continue;
 280                 }
 281
 282                 if (sockaddr->ss_family == AF_INET6) {
 283                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 284                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 285
 286                         if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
 287                                     (void *)&sock_in6_e->sin6_addr.in6_u,
 288                                     sizeof(struct in6_addr)))
 289                                 ip_match = 1;
 290
 291                         port = ntohs(sock_in6->sin6_port);
 292                 } else {
 293                         sock_in = (struct sockaddr_in *)sockaddr;
 294                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 295
 296                         if (sock_in->sin_addr.s_addr ==
 297                             sock_in_e->sin_addr.s_addr)
 298                                 ip_match = 1;
 299
 300                         port = ntohs(sock_in->sin_port);
 301                 }
 302
 303                 if ((ip_match == 1) && (np->np_port == port) &&
 304                     (np->np_network_transport == network_transport)) {
 305                         /*
 306                          * Increment the np_exports reference count now to
 307                          * prevent iscsit_del_np() below from being called
 308                          * while iscsi_tpg_add_network_portal() is called.
 309                          */
 310                         np->np_exports++;
 311                         spin_unlock(&np->np_thread_lock);
 312                         spin_unlock_bh(&np_lock);
 313                         return np;
 314                 }
 315                 spin_unlock(&np->np_thread_lock);
 316         }
 317         spin_unlock_bh(&np_lock);
 318
 319         return NULL;
 320 }
 321
 322 struct iscsi_np *iscsit_add_np(
 323         struct __kernel_sockaddr_storage *sockaddr,
 324         char *ip_str,
 325         int network_transport)
 326 {
 327         struct sockaddr_in *sock_in;
 328         struct sockaddr_in6 *sock_in6;
 329         struct iscsi_np *np;
 330         int ret;
 331         /*
 332          * Locate the existing struct iscsi_np if already active..
 333          */
 334         np = iscsit_get_np(sockaddr, network_transport);
 335         if (np)
 336                 return np;
 337
 338         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 339         if (!np) {
 340                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 341                 return ERR_PTR(-ENOMEM);
 342         }
 343
 344         np->np_flags |= NPF_IP_NETWORK;
 345         if (sockaddr->ss_family == AF_INET6) {
 346                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 347                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 348                 np->np_port = ntohs(sock_in6->sin6_port);
 349         } else {
 350                 sock_in = (struct sockaddr_in *)sockaddr;
 351                 sprintf(np->np_ip, "%s", ip_str);
 352                 np->np_port = ntohs(sock_in->sin_port);
 353         }
 354
 355         np->np_network_transport = network_transport;
 356         spin_lock_init(&np->np_thread_lock);
 357         init_completion(&np->np_restart_comp);
 358         INIT_LIST_HEAD(&np->np_list);
 359
 360         ret = iscsi_target_setup_login_socket(np, sockaddr);
 361         if (ret != 0) {
 362                 kfree(np);
 363                 return ERR_PTR(ret);
 364         }
 365
 366         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 367         if (IS_ERR(np->np_thread)) {
 368                 pr_err("Unable to create kthread: iscsi_np\n");
 369                 ret = PTR_ERR(np->np_thread);
 370                 kfree(np);
 371                 return ERR_PTR(ret);
 372         }
 373         /*
 374          * Increment the np_exports reference count now to prevent
 375          * iscsit_del_np() below from being run while a new call to
 376          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 377          * active.  We don't need to hold np->np_thread_lock at this
 378          * point because iscsi_np has not been added to g_np_list yet.
 379          */
 380         np->np_exports = 1;
 381
 382         spin_lock_bh(&np_lock);
 383         list_add_tail(&np->np_list, &g_np_list);
 384         spin_unlock_bh(&np_lock);
 385
 386         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 387                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 388                 "TCP" : "SCTP");
 389
 390         return np;
 391 }
 392
 393 int iscsit_reset_np_thread(
 394         struct iscsi_np *np,
 395         struct iscsi_tpg_np *tpg_np,
 396         struct iscsi_portal_group *tpg)
 397 {
 398         spin_lock_bh(&np->np_thread_lock);
 399         if (tpg && tpg_np) {
 400                 /*
 401                  * The reset operation need only be performed when the
 402                  * passed struct iscsi_portal_group has a login in progress
 403                  * to one of the network portals.
 404                  */
 405                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 406                         spin_unlock_bh(&np->np_thread_lock);
 407                         return 0;
 408                 }
 409         }
 410         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 411                 spin_unlock_bh(&np->np_thread_lock);
 412                 return 0;
 413         }
 414         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 415
 416         if (np->np_thread) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 send_sig(SIGINT, np->np_thread, 1);
 419                 wait_for_completion(&np->np_restart_comp);
 420                 spin_lock_bh(&np->np_thread_lock);
 421         }
 422         spin_unlock_bh(&np->np_thread_lock);
 423
 424         return 0;
 425 }
 426
 427 int iscsit_del_np_comm(struct iscsi_np *np)
 428 {
 429         if (!np->np_socket)
 430                 return 0;
 431
 432         /*
 433          * Some network transports allocate their own struct sock->file,
 434          * see  if we need to free any additional allocated resources.
 435          */
 436         if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
 437                 kfree(np->np_socket->file);
 438                 np->np_socket->file = NULL;
 439         }
 440
 441         sock_release(np->np_socket);
 442         return 0;
 443 }
 444
 445 int iscsit_del_np(struct iscsi_np *np)
 446 {
 447         spin_lock_bh(&np->np_thread_lock);
 448         np->np_exports--;
 449         if (np->np_exports) {
 450                 spin_unlock_bh(&np->np_thread_lock);
 451                 return 0;
 452         }
 453         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 454         spin_unlock_bh(&np->np_thread_lock);
 455
 456         if (np->np_thread) {
 457                 /*
 458                  * We need to send the signal to wakeup Linux/Net
 459                  * which may be sleeping in sock_accept()..
 460                  */
 461                 send_sig(SIGINT, np->np_thread, 1);
 462                 kthread_stop(np->np_thread);
 463         }
 464         iscsit_del_np_comm(np);
 465
 466         spin_lock_bh(&np_lock);
 467         list_del(&np->np_list);
 468         spin_unlock_bh(&np_lock);
 469
 470         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 471                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 472                 "TCP" : "SCTP");
 473
 474         kfree(np);
 475         return 0;
 476 }
 477
 478 static int __init iscsi_target_init_module(void)
 479 {
 480         int ret = 0;
 481
 482         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 483
 484         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 485         if (!iscsit_global) {
 486                 pr_err("Unable to allocate memory for iscsit_global\n");
 487                 return -1;
 488         }
 489         mutex_init(&auth_id_lock);
 490         spin_lock_init(&sess_idr_lock);
 491         idr_init(&tiqn_idr);
 492         idr_init(&sess_idr);
 493
 494         ret = iscsi_target_register_configfs();
 495         if (ret < 0)
 496                 goto out;
 497
 498         ret = iscsi_thread_set_init();
 499         if (ret < 0)
 500                 goto configfs_out;
 501
 502         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 503                         TARGET_THREAD_SET_COUNT) {
 504                 pr_err("iscsi_allocate_thread_sets() returned"
 505                         " unexpected value!\n");
 506                 goto ts_out1;
 507         }
 508
 509         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 510                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 511                         0, NULL);
 512         if (!lio_cmd_cache) {
 513                 pr_err("Unable to kmem_cache_create() for"
 514                                 " lio_cmd_cache\n");
 515                 goto ts_out2;
 516         }
 517
 518         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 519                         sizeof(struct iscsi_queue_req),
 520                         __alignof__(struct iscsi_queue_req), 0, NULL);
 521         if (!lio_qr_cache) {
 522                 pr_err("nable to kmem_cache_create() for"
 523                                 " lio_qr_cache\n");
 524                 goto cmd_out;
 525         }
 526
 527         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 528                         sizeof(struct iscsi_datain_req),
 529                         __alignof__(struct iscsi_datain_req), 0, NULL);
 530         if (!lio_dr_cache) {
 531                 pr_err("Unable to kmem_cache_create() for"
 532                                 " lio_dr_cache\n");
 533                 goto qr_out;
 534         }
 535
 536         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 537                         sizeof(struct iscsi_ooo_cmdsn),
 538                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 539         if (!lio_ooo_cache) {
 540                 pr_err("Unable to kmem_cache_create() for"
 541                                 " lio_ooo_cache\n");
 542                 goto dr_out;
 543         }
 544
 545         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 546                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 547                         0, NULL);
 548         if (!lio_r2t_cache) {
 549                 pr_err("Unable to kmem_cache_create() for"
 550                                 " lio_r2t_cache\n");
 551                 goto ooo_out;
 552         }
 553
 554         if (iscsit_load_discovery_tpg() < 0)
 555                 goto r2t_out;
 556
 557         return ret;
 558 r2t_out:
 559         kmem_cache_destroy(lio_r2t_cache);
 560 ooo_out:
 561         kmem_cache_destroy(lio_ooo_cache);
 562 dr_out:
 563         kmem_cache_destroy(lio_dr_cache);
 564 qr_out:
 565         kmem_cache_destroy(lio_qr_cache);
 566 cmd_out:
 567         kmem_cache_destroy(lio_cmd_cache);
 568 ts_out2:
 569         iscsi_deallocate_thread_sets();
 570 ts_out1:
 571         iscsi_thread_set_free();
 572 configfs_out:
 573         iscsi_target_deregister_configfs();
 574 out:
 575         kfree(iscsit_global);
 576         return -ENOMEM;
 577 }
 578
 579 static void __exit iscsi_target_cleanup_module(void)
 580 {
 581         iscsi_deallocate_thread_sets();
 582         iscsi_thread_set_free();
 583         iscsit_release_discovery_tpg();
 584         kmem_cache_destroy(lio_cmd_cache);
 585         kmem_cache_destroy(lio_qr_cache);
 586         kmem_cache_destroy(lio_dr_cache);
 587         kmem_cache_destroy(lio_ooo_cache);
 588         kmem_cache_destroy(lio_r2t_cache);
 589
 590         iscsi_target_deregister_configfs();
 591
 592         kfree(iscsit_global);
 593 }
 594
 595 int iscsit_add_reject(
 596         u8 reason,
 597         int fail_conn,
 598         unsigned char *buf,
 599         struct iscsi_conn *conn)
 600 {
 601         struct iscsi_cmd *cmd;
 602         struct iscsi_reject *hdr;
 603         int ret;
 604
 605         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 606         if (!cmd)
 607                 return -1;
 608
 609         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 610         if (fail_conn)
 611                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 612
 613         hdr     = (struct iscsi_reject *) cmd->pdu;
 614         hdr->reason = reason;
 615
 616         cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
 617         if (!cmd->buf_ptr) {
 618                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 619                 iscsit_release_cmd(cmd);
 620                 return -1;
 621         }
 622         memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
 623
 624         spin_lock_bh(&conn->cmd_lock);
 625         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 626         spin_unlock_bh(&conn->cmd_lock);
 627
 628         cmd->i_state = ISTATE_SEND_REJECT;
 629         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 630
 631         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 632         if (ret != 0)
 633                 return -1;
 634
 635         return (!fail_conn) ? 0 : -1;
 636 }
 637
 638 int iscsit_add_reject_from_cmd(
 639         u8 reason,
 640         int fail_conn,
 641         int add_to_conn,
 642         unsigned char *buf,
 643         struct iscsi_cmd *cmd)
 644 {
 645         struct iscsi_conn *conn;
 646         struct iscsi_reject *hdr;
 647         int ret;
 648
 649         if (!cmd->conn) {
 650                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 651                                 cmd->init_task_tag);
 652                 return -1;
 653         }
 654         conn = cmd->conn;
 655
 656         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 657         if (fail_conn)
 658                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 659
 660         hdr     = (struct iscsi_reject *) cmd->pdu;
 661         hdr->reason = reason;
 662
 663         cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
 664         if (!cmd->buf_ptr) {
 665                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 666                 iscsit_release_cmd(cmd);
 667                 return -1;
 668         }
 669         memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN);
 670
 671         if (add_to_conn) {
 672                 spin_lock_bh(&conn->cmd_lock);
 673                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 674                 spin_unlock_bh(&conn->cmd_lock);
 675         }
 676
 677         cmd->i_state = ISTATE_SEND_REJECT;
 678         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 679
 680         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 681         if (ret != 0)
 682                 return -1;
 683
 684         return (!fail_conn) ? 0 : -1;
 685 }
 686
 687 /*
 688  * Map some portion of the allocated scatterlist to an iovec, suitable for
 689  * kernel sockets to copy data in/out. This handles both pages and slab-allocated
 690  * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
 691  * either case (see iscsit_alloc_buffs)
 692  */
 693 static int iscsit_map_iovec(
 694         struct iscsi_cmd *cmd,
 695         struct kvec *iov,
 696         u32 data_offset,
 697         u32 data_length)
 698 {
 699         u32 i = 0;
 700         struct scatterlist *sg;
 701         unsigned int page_off;
 702
 703         /*
 704          * We have a private mapping of the allocated pages in t_mem_sg.
 705          * At this point, we also know each contains a page.
 706          */
 707         sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
 708         page_off = (data_offset % PAGE_SIZE);
 709
 710         cmd->first_data_sg = sg;
 711         cmd->first_data_sg_off = page_off;
 712
 713         while (data_length) {
 714                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 715
 716                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 717                 iov[i].iov_len = cur_len;
 718
 719                 data_length -= cur_len;
 720                 page_off = 0;
 721                 sg = sg_next(sg);
 722                 i++;
 723         }
 724
 725         cmd->kmapped_nents = i;
 726
 727         return i;
 728 }
 729
 730 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 731 {
 732         u32 i;
 733         struct scatterlist *sg;
 734
 735         sg = cmd->first_data_sg;
 736
 737         for (i = 0; i < cmd->kmapped_nents; i++)
 738                 kunmap(sg_page(&sg[i]));
 739 }
 740
 741 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 742 {
 743         struct iscsi_cmd *cmd;
 744
 745         conn->exp_statsn = exp_statsn;
 746
 747         spin_lock_bh(&conn->cmd_lock);
 748         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
 749                 spin_lock(&cmd->istate_lock);
 750                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 751                     (cmd->stat_sn < exp_statsn)) {
 752                         cmd->i_state = ISTATE_REMOVE;
 753                         spin_unlock(&cmd->istate_lock);
 754                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 755                                                 cmd->i_state);
 756                         continue;
 757                 }
 758                 spin_unlock(&cmd->istate_lock);
 759         }
 760         spin_unlock_bh(&conn->cmd_lock);
 761 }
 762
 763 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 764 {
 765         u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
 766                                 cmd->se_cmd.t_data_nents;
 767
 768         iov_count += TRANSPORT_IOV_DATA_BUFFER;
 769
 770         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 771         if (!cmd->iov_data) {
 772                 pr_err("Unable to allocate cmd->iov_data\n");
 773                 return -ENOMEM;
 774         }
 775
 776         cmd->orig_iov_data_count = iov_count;
 777         return 0;
 778 }
 779
 780 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
 781 {
 782         struct scatterlist *sgl;
 783         u32 length = cmd->se_cmd.data_length;
 784         int nents = DIV_ROUND_UP(length, PAGE_SIZE);
 785         int i = 0, ret;
 786         /*
 787          * If no SCSI payload is present, allocate the default iovecs used for
 788          * iSCSI PDU Header
 789          */
 790         if (!length)
 791                 return iscsit_allocate_iovecs(cmd);
 792
 793         sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
 794         if (!sgl)
 795                 return -ENOMEM;
 796
 797         sg_init_table(sgl, nents);
 798
 799         while (length) {
 800                 int buf_size = min_t(int, length, PAGE_SIZE);
 801                 struct page *page;
 802
 803                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 804                 if (!page)
 805                         goto page_alloc_failed;
 806
 807                 sg_set_page(&sgl[i], page, buf_size, 0);
 808
 809                 length -= buf_size;
 810                 i++;
 811         }
 812
 813         cmd->t_mem_sg = sgl;
 814         cmd->t_mem_sg_nents = nents;
 815
 816         /* BIDI ops not supported */
 817
 818         /* Tell the core about our preallocated memory */
 819         transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
 820         /*
 821          * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
 822          * so that cmd->se_cmd.t_tasks_se_num has been set.
 823          */
 824         ret = iscsit_allocate_iovecs(cmd);
 825         if (ret < 0)
 826                 goto page_alloc_failed;
 827
 828         return 0;
 829
 830 page_alloc_failed:
 831         while (i >= 0) {
 832                 __free_page(sg_page(&sgl[i]));
 833                 i--;
 834         }
 835         kfree(cmd->t_mem_sg);
 836         cmd->t_mem_sg = NULL;
 837         return -ENOMEM;
 838 }
 839
 840 static int iscsit_handle_scsi_cmd(
 841         struct iscsi_conn *conn,
 842         unsigned char *buf)
 843 {
 844         int     data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
 845         int     dump_immediate_data = 0, send_check_condition = 0, payload_length;
 846         struct iscsi_cmd        *cmd = NULL;
 847         struct iscsi_scsi_req *hdr;
 848
 849         spin_lock_bh(&conn->sess->session_stats_lock);
 850         conn->sess->cmd_pdus++;
 851         if (conn->sess->se_sess->se_node_acl) {
 852                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 853                 conn->sess->se_sess->se_node_acl->num_cmds++;
 854                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 855         }
 856         spin_unlock_bh(&conn->sess->session_stats_lock);
 857
 858         hdr                     = (struct iscsi_scsi_req *) buf;
 859         payload_length          = ntoh24(hdr->dlength);
 860         hdr->itt                = be32_to_cpu(hdr->itt);
 861         hdr->data_length        = be32_to_cpu(hdr->data_length);
 862         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
 863         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
 864
 865         /* FIXME; Add checks for AdditionalHeaderSegment */
 866
 867         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 868             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 869                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 870                                 " not set. Bad iSCSI Initiator.\n");
 871                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 872                                 buf, conn);
 873         }
 874
 875         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 876              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 877                 /*
 878                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 879                  * that adds support for RESERVE/RELEASE.  There is a bug
 880                  * add with this new functionality that sets R/W bits when
 881                  * neither CDB carries any READ or WRITE datapayloads.
 882                  */
 883                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 884                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 885                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 886                         goto done;
 887                 }
 888
 889                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 890                         " set when Expected Data Transfer Length is 0 for"
 891                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 892                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 893                                 buf, conn);
 894         }
 895 done:
 896
 897         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 898             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 899                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 900                         " MUST be set if Expected Data Transfer Length is not 0."
 901                         " Bad iSCSI Initiator\n");
 902                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 903                                 buf, conn);
 904         }
 905
 906         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 907             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 908                 pr_err("Bidirectional operations not supported!\n");
 909                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 910                                 buf, conn);
 911         }
 912
 913         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 914                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 915                                 " Scsi Command PDU.\n");
 916                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 917                                 buf, conn);
 918         }
 919
 920         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 921                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 922                         " protocol error.\n", payload_length);
 923                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 924                                 buf, conn);
 925         }
 926
 927         if ((hdr->data_length == payload_length) &&
 928             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 929                 pr_err("Expected Data Transfer Length and Length of"
 930                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 931                         " bit is not set protocol error\n");
 932                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 933                                 buf, conn);
 934         }
 935
 936         if (payload_length > hdr->data_length) {
 937                 pr_err("DataSegmentLength: %u is greater than"
 938                         " EDTL: %u, protocol error.\n", payload_length,
 939                                 hdr->data_length);
 940                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 941                                 buf, conn);
 942         }
 943
 944         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
 945                 pr_err("DataSegmentLength: %u is greater than"
 946                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 947                         payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
 948                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 949                                 buf, conn);
 950         }
 951
 952         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 953                 pr_err("DataSegmentLength: %u is greater than"
 954                         " FirstBurstLength: %u, protocol error.\n",
 955                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 956                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 957                                         buf, conn);
 958         }
 959
 960         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 961                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 962                           DMA_NONE;
 963
 964         cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
 965                                 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
 966         if (!cmd)
 967                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 968                                         buf, conn);
 969
 970         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 971                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 972                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 973
 974         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 975         cmd->i_state            = ISTATE_NEW_CMD;
 976         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 977         cmd->immediate_data     = (payload_length) ? 1 : 0;
 978         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 979                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 980         if (cmd->unsolicited_data)
 981                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 982
 983         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 984         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 985                 spin_lock_bh(&conn->sess->ttt_lock);
 986                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 987                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 988                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 989                 spin_unlock_bh(&conn->sess->ttt_lock);
 990         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 991                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 992         cmd->cmd_sn             = hdr->cmdsn;
 993         cmd->exp_stat_sn        = hdr->exp_statsn;
 994         cmd->first_burst_len    = payload_length;
 995
 996         if (cmd->data_direction == DMA_FROM_DEVICE) {
 997                 struct iscsi_datain_req *dr;
 998
 999                 dr = iscsit_allocate_datain_req();
1000                 if (!dr)
1001                         return iscsit_add_reject_from_cmd(
1002                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1003                                         1, 1, buf, cmd);
1004
1005                 iscsit_attach_datain_req(cmd, dr);
1006         }
1007
1008         /*
1009          * The CDB is going to an se_device_t.
1010          */
1011         ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1012                                 get_unaligned_le64(&hdr->lun));
1013         if (ret < 0) {
1014                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1015                         pr_debug("Responding to non-acl'ed,"
1016                                 " non-existent or non-exported iSCSI LUN:"
1017                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1018                 }
1019                 if (ret == PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES)
1020                         return iscsit_add_reject_from_cmd(
1021                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1022                                         1, 1, buf, cmd);
1023
1024                 send_check_condition = 1;
1025                 goto attach_cmd;
1026         }
1027         /*
1028          * The Initiator Node has access to the LUN (the addressing method
1029          * is handled inside of iscsit_get_lun_for_cmd()).  Now it's time to
1030          * allocate 1->N transport tasks (depending on sector count and
1031          * maximum request size the physical HBA(s) can handle.
1032          */
1033         transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1034         if (transport_ret == -ENOMEM) {
1035                 return iscsit_add_reject_from_cmd(
1036                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1037                                 1, 1, buf, cmd);
1038         } else if (transport_ret == -EINVAL) {
1039                 /*
1040                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
1041                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
1042                  * Mechinism.
1043                  */
1044                 send_check_condition = 1;
1045         } else {
1046                 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1047                         return iscsit_add_reject_from_cmd(
1048                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1049                                 1, 1, buf, cmd);
1050         }
1051
1052 attach_cmd:
1053         spin_lock_bh(&conn->cmd_lock);
1054         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1055         spin_unlock_bh(&conn->cmd_lock);
1056         /*
1057          * Check if we need to delay processing because of ALUA
1058          * Active/NonOptimized primary access state..
1059          */
1060         core_alua_check_nonop_delay(&cmd->se_cmd);
1061         /*
1062          * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1063          * also call iscsit_allocate_iovecs()
1064          */
1065         ret = iscsit_alloc_buffs(cmd);
1066         if (ret < 0)
1067                 return iscsit_add_reject_from_cmd(
1068                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1069                                 1, 1, buf, cmd);
1070         /*
1071          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1072          * the Immediate Bit is not set, and no Immediate
1073          * Data is attached.
1074          *
1075          * A PDU/CmdSN carrying Immediate Data can only
1076          * be processed after the DataCRC has passed.
1077          * If the DataCRC fails, the CmdSN MUST NOT
1078          * be acknowledged. (See below)
1079          */
1080         if (!cmd->immediate_data) {
1081                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1082                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1083                         return iscsit_add_reject_from_cmd(
1084                                 ISCSI_REASON_PROTOCOL_ERROR,
1085                                 1, 0, buf, cmd);
1086         }
1087
1088         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1089
1090         /*
1091          * If no Immediate Data is attached, it's OK to return now.
1092          */
1093         if (!cmd->immediate_data) {
1094                 if (send_check_condition)
1095                         return 0;
1096
1097                 if (cmd->unsolicited_data) {
1098                         iscsit_set_dataout_sequence_values(cmd);
1099
1100                         spin_lock_bh(&cmd->dataout_timeout_lock);
1101                         iscsit_start_dataout_timer(cmd, cmd->conn);
1102                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1103                 }
1104
1105                 return 0;
1106         }
1107
1108         /*
1109          * Early CHECK_CONDITIONs never make it to the transport processing
1110          * thread.  They are processed in CmdSN order by
1111          * iscsit_check_received_cmdsn() below.
1112          */
1113         if (send_check_condition) {
1114                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1115                 dump_immediate_data = 1;
1116                 goto after_immediate_data;
1117         }
1118         /*
1119          * Call directly into transport_generic_new_cmd() to perform
1120          * the backend memory allocation.
1121          */
1122         ret = transport_generic_new_cmd(&cmd->se_cmd);
1123         if ((ret < 0) || (cmd->se_cmd.se_cmd_flags & SCF_SE_CMD_FAILED)) {
1124                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1125                 dump_immediate_data = 1;
1126                 goto after_immediate_data;
1127         }
1128
1129         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1130 after_immediate_data:
1131         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1132                 /*
1133                  * A PDU/CmdSN carrying Immediate Data passed
1134                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1135                  * Immediate Bit is not set.
1136                  */
1137                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1138                 /*
1139                  * Special case for Unsupported SAM WRITE Opcodes
1140                  * and ImmediateData=Yes.
1141                  */
1142                 if (dump_immediate_data) {
1143                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1144                                 return -1;
1145                 } else if (cmd->unsolicited_data) {
1146                         iscsit_set_dataout_sequence_values(cmd);
1147
1148                         spin_lock_bh(&cmd->dataout_timeout_lock);
1149                         iscsit_start_dataout_timer(cmd, cmd->conn);
1150                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1151                 }
1152
1153                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1154                         return iscsit_add_reject_from_cmd(
1155                                 ISCSI_REASON_PROTOCOL_ERROR,
1156                                 1, 0, buf, cmd);
1157
1158         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1159                 /*
1160                  * Immediate Data failed DataCRC and ERL>=1,
1161                  * silently drop this PDU and let the initiator
1162                  * plug the CmdSN gap.
1163                  *
1164                  * FIXME: Send Unsolicited NOPIN with reserved
1165                  * TTT here to help the initiator figure out
1166                  * the missing CmdSN, although they should be
1167                  * intelligent enough to determine the missing
1168                  * CmdSN and issue a retry to plug the sequence.
1169                  */
1170                 cmd->i_state = ISTATE_REMOVE;
1171                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1172         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1173                 return -1;
1174
1175         return 0;
1176 }
1177
1178 static u32 iscsit_do_crypto_hash_sg(
1179         struct hash_desc *hash,
1180         struct iscsi_cmd *cmd,
1181         u32 data_offset,
1182         u32 data_length,
1183         u32 padding,
1184         u8 *pad_bytes)
1185 {
1186         u32 data_crc;
1187         u32 i;
1188         struct scatterlist *sg;
1189         unsigned int page_off;
1190
1191         crypto_hash_init(hash);
1192
1193         sg = cmd->first_data_sg;
1194         page_off = cmd->first_data_sg_off;
1195
1196         i = 0;
1197         while (data_length) {
1198                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1199
1200                 crypto_hash_update(hash, &sg[i], cur_len);
1201
1202                 data_length -= cur_len;
1203                 page_off = 0;
1204                 i++;
1205         }
1206
1207         if (padding) {
1208                 struct scatterlist pad_sg;
1209
1210                 sg_init_one(&pad_sg, pad_bytes, padding);
1211                 crypto_hash_update(hash, &pad_sg, padding);
1212         }
1213         crypto_hash_final(hash, (u8 *) &data_crc);
1214
1215         return data_crc;
1216 }
1217
1218 static void iscsit_do_crypto_hash_buf(
1219         struct hash_desc *hash,
1220         unsigned char *buf,
1221         u32 payload_length,
1222         u32 padding,
1223         u8 *pad_bytes,
1224         u8 *data_crc)
1225 {
1226         struct scatterlist sg;
1227
1228         crypto_hash_init(hash);
1229
1230         sg_init_one(&sg, (u8 *)buf, payload_length);
1231         crypto_hash_update(hash, &sg, payload_length);
1232
1233         if (padding) {
1234                 sg_init_one(&sg, pad_bytes, padding);
1235                 crypto_hash_update(hash, &sg, padding);
1236         }
1237         crypto_hash_final(hash, data_crc);
1238 }
1239
1240 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1241 {
1242         int iov_ret, ooo_cmdsn = 0, ret;
1243         u8 data_crc_failed = 0;
1244         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1245         u32 rx_size = 0, payload_length;
1246         struct iscsi_cmd *cmd = NULL;
1247         struct se_cmd *se_cmd;
1248         struct iscsi_data *hdr;
1249         struct kvec *iov;
1250         unsigned long flags;
1251
1252         hdr                     = (struct iscsi_data *) buf;
1253         payload_length          = ntoh24(hdr->dlength);
1254         hdr->itt                = be32_to_cpu(hdr->itt);
1255         hdr->ttt                = be32_to_cpu(hdr->ttt);
1256         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1257         hdr->datasn             = be32_to_cpu(hdr->datasn);
1258         hdr->offset             = be32_to_cpu(hdr->offset);
1259
1260         if (!payload_length) {
1261                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1262                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1263                                         buf, conn);
1264         }
1265
1266         /* iSCSI write */
1267         spin_lock_bh(&conn->sess->session_stats_lock);
1268         conn->sess->rx_data_octets += payload_length;
1269         if (conn->sess->se_sess->se_node_acl) {
1270                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1271                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1272                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1273         }
1274         spin_unlock_bh(&conn->sess->session_stats_lock);
1275
1276         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1277                 pr_err("DataSegmentLength: %u is greater than"
1278                         " MaxRecvDataSegmentLength: %u\n", payload_length,
1279                         conn->conn_ops->MaxRecvDataSegmentLength);
1280                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1281                                         buf, conn);
1282         }
1283
1284         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1285                         payload_length);
1286         if (!cmd)
1287                 return 0;
1288
1289         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1290                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1291                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1292                 payload_length, conn->cid);
1293
1294         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1295                 pr_err("Command ITT: 0x%08x received DataOUT after"
1296                         " last DataOUT received, dumping payload\n",
1297                         cmd->init_task_tag);
1298                 return iscsit_dump_data_payload(conn, payload_length, 1);
1299         }
1300
1301         if (cmd->data_direction != DMA_TO_DEVICE) {
1302                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1303                         " NON-WRITE command.\n", cmd->init_task_tag);
1304                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1305                                 1, 0, buf, cmd);
1306         }
1307         se_cmd = &cmd->se_cmd;
1308         iscsit_mod_dataout_timer(cmd);
1309
1310         if ((hdr->offset + payload_length) > cmd->data_length) {
1311                 pr_err("DataOut Offset: %u, Length %u greater than"
1312                         " iSCSI Command EDTL %u, protocol error.\n",
1313                         hdr->offset, payload_length, cmd->data_length);
1314                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1315                                 1, 0, buf, cmd);
1316         }
1317
1318         if (cmd->unsolicited_data) {
1319                 int dump_unsolicited_data = 0;
1320
1321                 if (conn->sess->sess_ops->InitialR2T) {
1322                         pr_err("Received unexpected unsolicited data"
1323                                 " while InitialR2T=Yes, protocol error.\n");
1324                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1325                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1326                         return -1;
1327                 }
1328                 /*
1329                  * Special case for dealing with Unsolicited DataOUT
1330                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1331                  * failures;
1332                  */
1333
1334                 /* Something's amiss if we're not in WRITE_PENDING state... */
1335                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1336                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1337                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1338
1339                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1340                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1341                      (se_cmd->se_cmd_flags & SCF_SE_CMD_FAILED))
1342                         dump_unsolicited_data = 1;
1343                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1344
1345                 if (dump_unsolicited_data) {
1346                         /*
1347                          * Check if a delayed TASK_ABORTED status needs to
1348                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1349                          * received with the unsolicitied data out.
1350                          */
1351                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1352                                 iscsit_stop_dataout_timer(cmd);
1353
1354                         transport_check_aborted_status(se_cmd,
1355                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1356                         return iscsit_dump_data_payload(conn, payload_length, 1);
1357                 }
1358         } else {
1359                 /*
1360                  * For the normal solicited data path:
1361                  *
1362                  * Check for a delayed TASK_ABORTED status and dump any
1363                  * incoming data out payload if one exists.  Also, when the
1364                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1365                  * data out sequence, we decrement outstanding_r2ts.  Once
1366                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1367                  * TASK_ABORTED status.
1368                  */
1369                 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1370                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1371                                 if (--cmd->outstanding_r2ts < 1) {
1372                                         iscsit_stop_dataout_timer(cmd);
1373                                         transport_check_aborted_status(
1374                                                         se_cmd, 1);
1375                                 }
1376
1377                         return iscsit_dump_data_payload(conn, payload_length, 1);
1378                 }
1379         }
1380         /*
1381          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1382          * within-command recovery checks before receiving the payload.
1383          */
1384         ret = iscsit_check_pre_dataout(cmd, buf);
1385         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1386                 return 0;
1387         else if (ret == DATAOUT_CANNOT_RECOVER)
1388                 return -1;
1389
1390         rx_size += payload_length;
1391         iov = &cmd->iov_data[0];
1392
1393         iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1394         if (iov_ret < 0)
1395                 return -1;
1396
1397         iov_count += iov_ret;
1398
1399         padding = ((-payload_length) & 3);
1400         if (padding != 0) {
1401                 iov[iov_count].iov_base = cmd->pad_bytes;
1402                 iov[iov_count++].iov_len = padding;
1403                 rx_size += padding;
1404                 pr_debug("Receiving %u padding bytes.\n", padding);
1405         }
1406
1407         if (conn->conn_ops->DataDigest) {
1408                 iov[iov_count].iov_base = &checksum;
1409                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1410                 rx_size += ISCSI_CRC_LEN;
1411         }
1412
1413         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1414
1415         iscsit_unmap_iovec(cmd);
1416
1417         if (rx_got != rx_size)
1418                 return -1;
1419
1420         if (conn->conn_ops->DataDigest) {
1421                 u32 data_crc;
1422
1423                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1424                                                     hdr->offset, payload_length, padding,
1425                                                     cmd->pad_bytes);
1426
1427                 if (checksum != data_crc) {
1428                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1429                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1430                                 " does not match computed 0x%08x\n",
1431                                 hdr->itt, hdr->offset, payload_length,
1432                                 hdr->datasn, checksum, data_crc);
1433                         data_crc_failed = 1;
1434                 } else {
1435                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1436                                 " %u bytes of Data Out\n", checksum,
1437                                 payload_length);
1438                 }
1439         }
1440         /*
1441          * Increment post receive data and CRC values or perform
1442          * within-command recovery.
1443          */
1444         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1445         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1446                 return 0;
1447         else if (ret == DATAOUT_SEND_R2T) {
1448                 iscsit_set_dataout_sequence_values(cmd);
1449                 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1450         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1451                 /*
1452                  * Handle extra special case for out of order
1453                  * Unsolicited Data Out.
1454                  */
1455                 spin_lock_bh(&cmd->istate_lock);
1456                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1457                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1458                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1459                 spin_unlock_bh(&cmd->istate_lock);
1460
1461                 iscsit_stop_dataout_timer(cmd);
1462                 return (!ooo_cmdsn) ? transport_generic_handle_data(
1463                                         &cmd->se_cmd) : 0;
1464         } else /* DATAOUT_CANNOT_RECOVER */
1465                 return -1;
1466
1467         return 0;
1468 }
1469
1470 static int iscsit_handle_nop_out(
1471         struct iscsi_conn *conn,
1472         unsigned char *buf)
1473 {
1474         unsigned char *ping_data = NULL;
1475         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1476         u32 checksum, data_crc, padding = 0, payload_length;
1477         u64 lun;
1478         struct iscsi_cmd *cmd = NULL;
1479         struct kvec *iov = NULL;
1480         struct iscsi_nopout *hdr;
1481
1482         hdr                     = (struct iscsi_nopout *) buf;
1483         payload_length          = ntoh24(hdr->dlength);
1484         lun                     = get_unaligned_le64(&hdr->lun);
1485         hdr->itt                = be32_to_cpu(hdr->itt);
1486         hdr->ttt                = be32_to_cpu(hdr->ttt);
1487         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1488         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1489
1490         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1491                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1492                         " not set, protocol error.\n");
1493                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1494                                         buf, conn);
1495         }
1496
1497         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1498                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1499                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1500                         " error.\n", payload_length,
1501                         conn->conn_ops->MaxRecvDataSegmentLength);
1502                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1503                                         buf, conn);
1504         }
1505
1506         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1507                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1508                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1509                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1510                 payload_length);
1511         /*
1512          * This is not a response to a Unsolicited NopIN, which means
1513          * it can either be a NOPOUT ping request (with a valid ITT),
1514          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1515          * Either way, make sure we allocate an struct iscsi_cmd, as both
1516          * can contain ping data.
1517          */
1518         if (hdr->ttt == 0xFFFFFFFF) {
1519                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1520                 if (!cmd)
1521                         return iscsit_add_reject(
1522                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1523                                         1, buf, conn);
1524
1525                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1526                 cmd->i_state            = ISTATE_SEND_NOPIN;
1527                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1528                                                 1 : 0);
1529                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1530                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1531                 cmd->cmd_sn             = hdr->cmdsn;
1532                 cmd->exp_stat_sn        = hdr->exp_statsn;
1533                 cmd->data_direction     = DMA_NONE;
1534         }
1535
1536         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1537                 rx_size = payload_length;
1538                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1539                 if (!ping_data) {
1540                         pr_err("Unable to allocate memory for"
1541                                 " NOPOUT ping data.\n");
1542                         ret = -1;
1543                         goto out;
1544                 }
1545
1546                 iov = &cmd->iov_misc[0];
1547                 iov[niov].iov_base      = ping_data;
1548                 iov[niov++].iov_len     = payload_length;
1549
1550                 padding = ((-payload_length) & 3);
1551                 if (padding != 0) {
1552                         pr_debug("Receiving %u additional bytes"
1553                                 " for padding.\n", padding);
1554                         iov[niov].iov_base      = &cmd->pad_bytes;
1555                         iov[niov++].iov_len     = padding;
1556                         rx_size += padding;
1557                 }
1558                 if (conn->conn_ops->DataDigest) {
1559                         iov[niov].iov_base      = &checksum;
1560                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1561                         rx_size += ISCSI_CRC_LEN;
1562                 }
1563
1564                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1565                 if (rx_got != rx_size) {
1566                         ret = -1;
1567                         goto out;
1568                 }
1569
1570                 if (conn->conn_ops->DataDigest) {
1571                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1572                                         ping_data, payload_length,
1573                                         padding, cmd->pad_bytes,
1574                                         (u8 *)&data_crc);
1575
1576                         if (checksum != data_crc) {
1577                                 pr_err("Ping data CRC32C DataDigest"
1578                                 " 0x%08x does not match computed 0x%08x\n",
1579                                         checksum, data_crc);
1580                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1581                                         pr_err("Unable to recover from"
1582                                         " NOPOUT Ping DataCRC failure while in"
1583                                                 " ERL=0.\n");
1584                                         ret = -1;
1585                                         goto out;
1586                                 } else {
1587                                         /*
1588                                          * Silently drop this PDU and let the
1589                                          * initiator plug the CmdSN gap.
1590                                          */
1591                                         pr_debug("Dropping NOPOUT"
1592                                         " Command CmdSN: 0x%08x due to"
1593                                         " DataCRC error.\n", hdr->cmdsn);
1594                                         ret = 0;
1595                                         goto out;
1596                                 }
1597                         } else {
1598                                 pr_debug("Got CRC32C DataDigest"
1599                                 " 0x%08x for %u bytes of ping data.\n",
1600                                         checksum, payload_length);
1601                         }
1602                 }
1603
1604                 ping_data[payload_length] = '\0';
1605                 /*
1606                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1607                  */
1608                 cmd->buf_ptr = (void *)ping_data;
1609                 cmd->buf_ptr_size = payload_length;
1610
1611                 pr_debug("Got %u bytes of NOPOUT ping"
1612                         " data.\n", payload_length);
1613                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1614         }
1615
1616         if (hdr->itt != 0xFFFFFFFF) {
1617                 if (!cmd) {
1618                         pr_err("Checking CmdSN for NOPOUT,"
1619                                 " but cmd is NULL!\n");
1620                         return -1;
1621                 }
1622                 /*
1623                  * Initiator is expecting a NopIN ping reply,
1624                  */
1625                 spin_lock_bh(&conn->cmd_lock);
1626                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1627                 spin_unlock_bh(&conn->cmd_lock);
1628
1629                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1630
1631                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1632                         iscsit_add_cmd_to_response_queue(cmd, conn,
1633                                         cmd->i_state);
1634                         return 0;
1635                 }
1636
1637                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1638                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1639                         ret = 0;
1640                         goto ping_out;
1641                 }
1642                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1643                         return iscsit_add_reject_from_cmd(
1644                                         ISCSI_REASON_PROTOCOL_ERROR,
1645                                         1, 0, buf, cmd);
1646
1647                 return 0;
1648         }
1649
1650         if (hdr->ttt != 0xFFFFFFFF) {
1651                 /*
1652                  * This was a response to a unsolicited NOPIN ping.
1653                  */
1654                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1655                 if (!cmd)
1656                         return -1;
1657
1658                 iscsit_stop_nopin_response_timer(conn);
1659
1660                 cmd->i_state = ISTATE_REMOVE;
1661                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1662                 iscsit_start_nopin_timer(conn);
1663         } else {
1664                 /*
1665                  * Initiator is not expecting a NOPIN is response.
1666                  * Just ignore for now.
1667                  *
1668                  * iSCSI v19-91 10.18
1669                  * "A NOP-OUT may also be used to confirm a changed
1670                  *  ExpStatSN if another PDU will not be available
1671                  *  for a long time."
1672                  */
1673                 ret = 0;
1674                 goto out;
1675         }
1676
1677         return 0;
1678 out:
1679         if (cmd)
1680                 iscsit_release_cmd(cmd);
1681 ping_out:
1682         kfree(ping_data);
1683         return ret;
1684 }
1685
1686 static int iscsit_handle_task_mgt_cmd(
1687         struct iscsi_conn *conn,
1688         unsigned char *buf)
1689 {
1690         struct iscsi_cmd *cmd;
1691         struct se_tmr_req *se_tmr;
1692         struct iscsi_tmr_req *tmr_req;
1693         struct iscsi_tm *hdr;
1694         u32 payload_length;
1695         int out_of_order_cmdsn = 0;
1696         int ret;
1697         u8 function;
1698
1699         hdr                     = (struct iscsi_tm *) buf;
1700         payload_length          = ntoh24(hdr->dlength);
1701         hdr->itt                = be32_to_cpu(hdr->itt);
1702         hdr->rtt                = be32_to_cpu(hdr->rtt);
1703         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1704         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1705         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1706         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1707         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1708         function = hdr->flags;
1709
1710         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1711                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1712                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1713                 hdr->rtt, hdr->refcmdsn, conn->cid);
1714
1715         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1716             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1717              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1718                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1719                 hdr->rtt = ISCSI_RESERVED_TAG;
1720         }
1721
1722         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1723                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1724                 pr_err("Task Management Request TASK_REASSIGN not"
1725                         " issued as immediate command, bad iSCSI Initiator"
1726                                 "implementation\n");
1727                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1728                                         buf, conn);
1729         }
1730         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1731             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1732                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1733
1734         cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1735         if (!cmd)
1736                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1737                                         1, buf, conn);
1738
1739         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1740         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1741         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1742         cmd->init_task_tag      = hdr->itt;
1743         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1744         cmd->cmd_sn             = hdr->cmdsn;
1745         cmd->exp_stat_sn        = hdr->exp_statsn;
1746         se_tmr                  = cmd->se_cmd.se_tmr_req;
1747         tmr_req                 = cmd->tmr_req;
1748         /*
1749          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1750          */
1751         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1752                 ret = iscsit_get_lun_for_tmr(cmd,
1753                                 get_unaligned_le64(&hdr->lun));
1754                 if (ret < 0) {
1755                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1756                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1757                         goto attach;
1758                 }
1759         }
1760
1761         switch (function) {
1762         case ISCSI_TM_FUNC_ABORT_TASK:
1763                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1764                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1765                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1766                         goto attach;
1767                 }
1768                 break;
1769         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1770         case ISCSI_TM_FUNC_CLEAR_ACA:
1771         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1772         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1773                 break;
1774         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1775                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1776                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1777                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1778                         goto attach;
1779                 }
1780                 break;
1781         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1782                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1783                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1784                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1785                         goto attach;
1786                 }
1787                 break;
1788         case ISCSI_TM_FUNC_TASK_REASSIGN:
1789                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1790                 /*
1791                  * Perform sanity checks on the ExpDataSN only if the
1792                  * TASK_REASSIGN was successful.
1793                  */
1794                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1795                         break;
1796
1797                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1798                         return iscsit_add_reject_from_cmd(
1799                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1800                                         buf, cmd);
1801                 break;
1802         default:
1803                 pr_err("Unknown TMR function: 0x%02x, protocol"
1804                         " error.\n", function);
1805                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1806                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1807                 goto attach;
1808         }
1809
1810         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1811             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1812                 se_tmr->call_transport = 1;
1813 attach:
1814         spin_lock_bh(&conn->cmd_lock);
1815         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1816         spin_unlock_bh(&conn->cmd_lock);
1817
1818         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1819                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1820                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1821                         out_of_order_cmdsn = 1;
1822                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1823                         return 0;
1824                 } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
1825                         return iscsit_add_reject_from_cmd(
1826                                         ISCSI_REASON_PROTOCOL_ERROR,
1827                                         1, 0, buf, cmd);
1828                 }
1829         }
1830         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1831
1832         if (out_of_order_cmdsn)
1833                 return 0;
1834         /*
1835          * Found the referenced task, send to transport for processing.
1836          */
1837         if (se_tmr->call_transport)
1838                 return transport_generic_handle_tmr(&cmd->se_cmd);
1839
1840         /*
1841          * Could not find the referenced LUN, task, or Task Management
1842          * command not authorized or supported.  Change state and
1843          * let the tx_thread send the response.
1844          *
1845          * For connection recovery, this is also the default action for
1846          * TMR TASK_REASSIGN.
1847          */
1848         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1849         return 0;
1850 }
1851
1852 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1853 static int iscsit_handle_text_cmd(
1854         struct iscsi_conn *conn,
1855         unsigned char *buf)
1856 {
1857         char *text_ptr, *text_in;
1858         int cmdsn_ret, niov = 0, rx_got, rx_size;
1859         u32 checksum = 0, data_crc = 0, payload_length;
1860         u32 padding = 0, pad_bytes = 0, text_length = 0;
1861         struct iscsi_cmd *cmd;
1862         struct kvec iov[3];
1863         struct iscsi_text *hdr;
1864
1865         hdr                     = (struct iscsi_text *) buf;
1866         payload_length          = ntoh24(hdr->dlength);
1867         hdr->itt                = be32_to_cpu(hdr->itt);
1868         hdr->ttt                = be32_to_cpu(hdr->ttt);
1869         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1870         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1871
1872         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1873                 pr_err("Unable to accept text parameter length: %u"
1874                         "greater than MaxRecvDataSegmentLength %u.\n",
1875                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1876                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1877                                         buf, conn);
1878         }
1879
1880         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1881                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1882                 hdr->exp_statsn, payload_length);
1883
1884         rx_size = text_length = payload_length;
1885         if (text_length) {
1886                 text_in = kzalloc(text_length, GFP_KERNEL);
1887                 if (!text_in) {
1888                         pr_err("Unable to allocate memory for"
1889                                 " incoming text parameters\n");
1890                         return -1;
1891                 }
1892
1893                 memset(iov, 0, 3 * sizeof(struct kvec));
1894                 iov[niov].iov_base      = text_in;
1895                 iov[niov++].iov_len     = text_length;
1896
1897                 padding = ((-payload_length) & 3);
1898                 if (padding != 0) {
1899                         iov[niov].iov_base = &pad_bytes;
1900                         iov[niov++].iov_len  = padding;
1901                         rx_size += padding;
1902                         pr_debug("Receiving %u additional bytes"
1903                                         " for padding.\n", padding);
1904                 }
1905                 if (conn->conn_ops->DataDigest) {
1906                         iov[niov].iov_base      = &checksum;
1907                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1908                         rx_size += ISCSI_CRC_LEN;
1909                 }
1910
1911                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1912                 if (rx_got != rx_size) {
1913                         kfree(text_in);
1914                         return -1;
1915                 }
1916
1917                 if (conn->conn_ops->DataDigest) {
1918                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1919                                         text_in, text_length,
1920                                         padding, (u8 *)&pad_bytes,
1921                                         (u8 *)&data_crc);
1922
1923                         if (checksum != data_crc) {
1924                                 pr_err("Text data CRC32C DataDigest"
1925                                         " 0x%08x does not match computed"
1926                                         " 0x%08x\n", checksum, data_crc);
1927                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1928                                         pr_err("Unable to recover from"
1929                                         " Text Data digest failure while in"
1930                                                 " ERL=0.\n");
1931                                         kfree(text_in);
1932                                         return -1;
1933                                 } else {
1934                                         /*
1935                                          * Silently drop this PDU and let the
1936                                          * initiator plug the CmdSN gap.
1937                                          */
1938                                         pr_debug("Dropping Text"
1939                                         " Command CmdSN: 0x%08x due to"
1940                                         " DataCRC error.\n", hdr->cmdsn);
1941                                         kfree(text_in);
1942                                         return 0;
1943                                 }
1944                         } else {
1945                                 pr_debug("Got CRC32C DataDigest"
1946                                         " 0x%08x for %u bytes of text data.\n",
1947                                                 checksum, text_length);
1948                         }
1949                 }
1950                 text_in[text_length - 1] = '\0';
1951                 pr_debug("Successfully read %d bytes of text"
1952                                 " data.\n", text_length);
1953
1954                 if (strncmp("SendTargets", text_in, 11) != 0) {
1955                         pr_err("Received Text Data that is not"
1956                                 " SendTargets, cannot continue.\n");
1957                         kfree(text_in);
1958                         return -1;
1959                 }
1960                 text_ptr = strchr(text_in, '=');
1961                 if (!text_ptr) {
1962                         pr_err("No \"=\" separator found in Text Data,"
1963                                 "  cannot continue.\n");
1964                         kfree(text_in);
1965                         return -1;
1966                 }
1967                 if (strncmp("=All", text_ptr, 4) != 0) {
1968                         pr_err("Unable to locate All value for"
1969                                 " SendTargets key,  cannot continue.\n");
1970                         kfree(text_in);
1971                         return -1;
1972                 }
1973 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1974                 kfree(text_in);
1975         }
1976
1977         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1978         if (!cmd)
1979                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1980                                         1, buf, conn);
1981
1982         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1983         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1984         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1985         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1986         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1987         cmd->cmd_sn             = hdr->cmdsn;
1988         cmd->exp_stat_sn        = hdr->exp_statsn;
1989         cmd->data_direction     = DMA_NONE;
1990
1991         spin_lock_bh(&conn->cmd_lock);
1992         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1993         spin_unlock_bh(&conn->cmd_lock);
1994
1995         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1996
1997         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1998                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1999                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2000                         return iscsit_add_reject_from_cmd(
2001                                         ISCSI_REASON_PROTOCOL_ERROR,
2002                                         1, 0, buf, cmd);
2003
2004                 return 0;
2005         }
2006
2007         return iscsit_execute_cmd(cmd, 0);
2008 }
2009
2010 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2011 {
2012         struct iscsi_conn *conn_p;
2013         struct iscsi_session *sess = conn->sess;
2014
2015         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2016                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2017
2018         atomic_set(&sess->session_logout, 1);
2019         atomic_set(&conn->conn_logout_remove, 1);
2020         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2021
2022         iscsit_inc_conn_usage_count(conn);
2023         iscsit_inc_session_usage_count(sess);
2024
2025         spin_lock_bh(&sess->conn_lock);
2026         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2027                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2028                         continue;
2029
2030                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2031                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2032         }
2033         spin_unlock_bh(&sess->conn_lock);
2034
2035         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2036
2037         return 0;
2038 }
2039
2040 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2041 {
2042         struct iscsi_conn *l_conn;
2043         struct iscsi_session *sess = conn->sess;
2044
2045         pr_debug("Received logout request CLOSECONNECTION for CID:"
2046                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2047
2048         /*
2049          * A Logout Request with a CLOSECONNECTION reason code for a CID
2050          * can arrive on a connection with a differing CID.
2051          */
2052         if (conn->cid == cmd->logout_cid) {
2053                 spin_lock_bh(&conn->state_lock);
2054                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2055                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2056
2057                 atomic_set(&conn->conn_logout_remove, 1);
2058                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2059                 iscsit_inc_conn_usage_count(conn);
2060
2061                 spin_unlock_bh(&conn->state_lock);
2062         } else {
2063                 /*
2064                  * Handle all different cid CLOSECONNECTION requests in
2065                  * iscsit_logout_post_handler_diffcid() as to give enough
2066                  * time for any non immediate command's CmdSN to be
2067                  * acknowledged on the connection in question.
2068                  *
2069                  * Here we simply make sure the CID is still around.
2070                  */
2071                 l_conn = iscsit_get_conn_from_cid(sess,
2072                                 cmd->logout_cid);
2073                 if (!l_conn) {
2074                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2075                         iscsit_add_cmd_to_response_queue(cmd, conn,
2076                                         cmd->i_state);
2077                         return 0;
2078                 }
2079
2080                 iscsit_dec_conn_usage_count(l_conn);
2081         }
2082
2083         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2084
2085         return 0;
2086 }
2087
2088 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2089 {
2090         struct iscsi_session *sess = conn->sess;
2091
2092         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2093                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2094
2095         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2096                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2097                         " while ERL!=2.\n");
2098                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2099                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2100                 return 0;
2101         }
2102
2103         if (conn->cid == cmd->logout_cid) {
2104                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2105                         " with CID: %hu on CID: %hu, implementation error.\n",
2106                                 cmd->logout_cid, conn->cid);
2107                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2108                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2109                 return 0;
2110         }
2111
2112         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2113
2114         return 0;
2115 }
2116
2117 static int iscsit_handle_logout_cmd(
2118         struct iscsi_conn *conn,
2119         unsigned char *buf)
2120 {
2121         int cmdsn_ret, logout_remove = 0;
2122         u8 reason_code = 0;
2123         struct iscsi_cmd *cmd;
2124         struct iscsi_logout *hdr;
2125         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2126
2127         hdr                     = (struct iscsi_logout *) buf;
2128         reason_code             = (hdr->flags & 0x7f);
2129         hdr->itt                = be32_to_cpu(hdr->itt);
2130         hdr->cid                = be16_to_cpu(hdr->cid);
2131         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2132         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2133
2134         if (tiqn) {
2135                 spin_lock(&tiqn->logout_stats.lock);
2136                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2137                         tiqn->logout_stats.normal_logouts++;
2138                 else
2139                         tiqn->logout_stats.abnormal_logouts++;
2140                 spin_unlock(&tiqn->logout_stats.lock);
2141         }
2142
2143         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2144                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2145                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2146                 hdr->cid, conn->cid);
2147
2148         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2149                 pr_err("Received logout request on connection that"
2150                         " is not in logged in state, ignoring request.\n");
2151                 return 0;
2152         }
2153
2154         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2155         if (!cmd)
2156                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2157                                         buf, conn);
2158
2159         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2160         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2161         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2162         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2163         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2164         cmd->cmd_sn             = hdr->cmdsn;
2165         cmd->exp_stat_sn        = hdr->exp_statsn;
2166         cmd->logout_cid         = hdr->cid;
2167         cmd->logout_reason      = reason_code;
2168         cmd->data_direction     = DMA_NONE;
2169
2170         /*
2171          * We need to sleep in these cases (by returning 1) until the Logout
2172          * Response gets sent in the tx thread.
2173          */
2174         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2175            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2176             (hdr->cid == conn->cid)))
2177                 logout_remove = 1;
2178
2179         spin_lock_bh(&conn->cmd_lock);
2180         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2181         spin_unlock_bh(&conn->cmd_lock);
2182
2183         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2184                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2185
2186         /*
2187          * Immediate commands are executed, well, immediately.
2188          * Non-Immediate Logout Commands are executed in CmdSN order.
2189          */
2190         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2191                 int ret = iscsit_execute_cmd(cmd, 0);
2192
2193                 if (ret < 0)
2194                         return ret;
2195         } else {
2196                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2197                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2198                         logout_remove = 0;
2199                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2200                         return iscsit_add_reject_from_cmd(
2201                                 ISCSI_REASON_PROTOCOL_ERROR,
2202                                 1, 0, buf, cmd);
2203                 }
2204         }
2205
2206         return logout_remove;
2207 }
2208
2209 static int iscsit_handle_snack(
2210         struct iscsi_conn *conn,
2211         unsigned char *buf)
2212 {
2213         u32 unpacked_lun;
2214         u64 lun;
2215         struct iscsi_snack *hdr;
2216
2217         hdr                     = (struct iscsi_snack *) buf;
2218         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2219         lun                     = get_unaligned_le64(&hdr->lun);
2220         unpacked_lun            = scsilun_to_int((struct scsi_lun *)&lun);
2221         hdr->itt                = be32_to_cpu(hdr->itt);
2222         hdr->ttt                = be32_to_cpu(hdr->ttt);
2223         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2224         hdr->begrun             = be32_to_cpu(hdr->begrun);
2225         hdr->runlength          = be32_to_cpu(hdr->runlength);
2226
2227         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2228                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2229                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2230                         hdr->begrun, hdr->runlength, conn->cid);
2231
2232         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2233                 pr_err("Initiator sent SNACK request while in"
2234                         " ErrorRecoveryLevel=0.\n");
2235                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2236                                         buf, conn);
2237         }
2238         /*
2239          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2240          * call from inside iscsi_send_recovery_datain_or_r2t().
2241          */
2242         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2243         case 0:
2244                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2245                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2246         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2247                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2248                         hdr->begrun, hdr->runlength);
2249         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2250                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2251                         hdr->runlength);
2252         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2253                 /* FIXME: Support R-Data SNACK */
2254                 pr_err("R-Data SNACK Not Supported.\n");
2255                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2256                                         buf, conn);
2257         default:
2258                 pr_err("Unknown SNACK type 0x%02x, protocol"
2259                         " error.\n", hdr->flags & 0x0f);
2260                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2261                                         buf, conn);
2262         }
2263
2264         return 0;
2265 }
2266
2267 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2268 {
2269         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2270             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2271                 wait_for_completion_interruptible_timeout(
2272                                         &conn->rx_half_close_comp,
2273                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2274         }
2275 }
2276
2277 static int iscsit_handle_immediate_data(
2278         struct iscsi_cmd *cmd,
2279         unsigned char *buf,
2280         u32 length)
2281 {
2282         int iov_ret, rx_got = 0, rx_size = 0;
2283         u32 checksum, iov_count = 0, padding = 0;
2284         struct iscsi_conn *conn = cmd->conn;
2285         struct kvec *iov;
2286
2287         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2288         if (iov_ret < 0)
2289                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2290
2291         rx_size = length;
2292         iov_count = iov_ret;
2293         iov = &cmd->iov_data[0];
2294
2295         padding = ((-length) & 3);
2296         if (padding != 0) {
2297                 iov[iov_count].iov_base = cmd->pad_bytes;
2298                 iov[iov_count++].iov_len = padding;
2299                 rx_size += padding;
2300         }
2301
2302         if (conn->conn_ops->DataDigest) {
2303                 iov[iov_count].iov_base         = &checksum;
2304                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2305                 rx_size += ISCSI_CRC_LEN;
2306         }
2307
2308         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2309
2310         iscsit_unmap_iovec(cmd);
2311
2312         if (rx_got != rx_size) {
2313                 iscsit_rx_thread_wait_for_tcp(conn);
2314                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2315         }
2316
2317         if (conn->conn_ops->DataDigest) {
2318                 u32 data_crc;
2319
2320                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2321                                                     cmd->write_data_done, length, padding,
2322                                                     cmd->pad_bytes);
2323
2324                 if (checksum != data_crc) {
2325                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2326                                 " does not match computed 0x%08x\n", checksum,
2327                                 data_crc);
2328
2329                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2330                                 pr_err("Unable to recover from"
2331                                         " Immediate Data digest failure while"
2332                                         " in ERL=0.\n");
2333                                 iscsit_add_reject_from_cmd(
2334                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2335                                                 1, 0, buf, cmd);
2336                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2337                         } else {
2338                                 iscsit_add_reject_from_cmd(
2339                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2340                                                 0, 0, buf, cmd);
2341                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2342                         }
2343                 } else {
2344                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2345                                 " %u bytes of Immediate Data\n", checksum,
2346                                 length);
2347                 }
2348         }
2349
2350         cmd->write_data_done += length;
2351
2352         if (cmd->write_data_done == cmd->data_length) {
2353                 spin_lock_bh(&cmd->istate_lock);
2354                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2355                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2356                 spin_unlock_bh(&cmd->istate_lock);
2357         }
2358
2359         return IMMEDIATE_DATA_NORMAL_OPERATION;
2360 }
2361
2362 /*
2363  *      Called with sess->conn_lock held.
2364  */
2365 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2366         with active network interface */
2367 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2368 {
2369         struct iscsi_cmd *cmd;
2370         struct iscsi_conn *conn_p;
2371
2372         /*
2373          * Only send a Asynchronous Message on connections whos network
2374          * interface is still functional.
2375          */
2376         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2377                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2378                         iscsit_inc_conn_usage_count(conn_p);
2379                         break;
2380                 }
2381         }
2382
2383         if (!conn_p)
2384                 return;
2385
2386         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2387         if (!cmd) {
2388                 iscsit_dec_conn_usage_count(conn_p);
2389                 return;
2390         }
2391
2392         cmd->logout_cid = conn->cid;
2393         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2394         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2395
2396         spin_lock_bh(&conn_p->cmd_lock);
2397         list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2398         spin_unlock_bh(&conn_p->cmd_lock);
2399
2400         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2401         iscsit_dec_conn_usage_count(conn_p);
2402 }
2403
2404 static int iscsit_send_conn_drop_async_message(
2405         struct iscsi_cmd *cmd,
2406         struct iscsi_conn *conn)
2407 {
2408         struct iscsi_async *hdr;
2409
2410         cmd->tx_size = ISCSI_HDR_LEN;
2411         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2412
2413         hdr                     = (struct iscsi_async *) cmd->pdu;
2414         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2415         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2416         cmd->init_task_tag      = 0xFFFFFFFF;
2417         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2418         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2419         cmd->stat_sn            = conn->stat_sn++;
2420         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2421         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2422         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2423         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2424         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2425         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2426         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2427
2428         if (conn->conn_ops->HeaderDigest) {
2429                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2430
2431                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2432                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2433                                 0, NULL, (u8 *)header_digest);
2434
2435                 cmd->tx_size += ISCSI_CRC_LEN;
2436                 pr_debug("Attaching CRC32C HeaderDigest to"
2437                         " Async Message 0x%08x\n", *header_digest);
2438         }
2439
2440         cmd->iov_misc[0].iov_base       = cmd->pdu;
2441         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2442         cmd->iov_misc_count             = 1;
2443
2444         pr_debug("Sending Connection Dropped Async Message StatSN:"
2445                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2446                         cmd->logout_cid, conn->cid);
2447         return 0;
2448 }
2449
2450 static int iscsit_send_data_in(
2451         struct iscsi_cmd *cmd,
2452         struct iscsi_conn *conn,
2453         int *eodr)
2454 {
2455         int iov_ret = 0, set_statsn = 0;
2456         u32 iov_count = 0, tx_size = 0;
2457         struct iscsi_datain datain;
2458         struct iscsi_datain_req *dr;
2459         struct iscsi_data_rsp *hdr;
2460         struct kvec *iov;
2461
2462         memset(&datain, 0, sizeof(struct iscsi_datain));
2463         dr = iscsit_get_datain_values(cmd, &datain);
2464         if (!dr) {
2465                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2466                                 cmd->init_task_tag);
2467                 return -1;
2468         }
2469
2470         /*
2471          * Be paranoid and double check the logic for now.
2472          */
2473         if ((datain.offset + datain.length) > cmd->data_length) {
2474                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2475                         " datain.length: %u exceeds cmd->data_length: %u\n",
2476                         cmd->init_task_tag, datain.offset, datain.length,
2477                                 cmd->data_length);
2478                 return -1;
2479         }
2480
2481         spin_lock_bh(&conn->sess->session_stats_lock);
2482         conn->sess->tx_data_octets += datain.length;
2483         if (conn->sess->se_sess->se_node_acl) {
2484                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2485                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2486                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2487         }
2488         spin_unlock_bh(&conn->sess->session_stats_lock);
2489         /*
2490          * Special case for successfully execution w/ both DATAIN
2491          * and Sense Data.
2492          */
2493         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2494             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2495                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2496         else {
2497                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2498                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2499                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2500                         cmd->stat_sn = conn->stat_sn++;
2501                         set_statsn = 1;
2502                 } else if (dr->dr_complete ==
2503                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2504                         set_statsn = 1;
2505         }
2506
2507         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2508         memset(hdr, 0, ISCSI_HDR_LEN);
2509         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2510         hdr->flags              = datain.flags;
2511         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2512                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2513                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2514                         hdr->residual_count = cpu_to_be32(cmd->residual_count);
2515                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2516                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2517                         hdr->residual_count = cpu_to_be32(cmd->residual_count);
2518                 }
2519         }
2520         hton24(hdr->dlength, datain.length);
2521         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2522                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2523                                 (struct scsi_lun *)&hdr->lun);
2524         else
2525                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2526
2527         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2528         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2529                                    cpu_to_be32(cmd->targ_xfer_tag) :
2530                                    0xFFFFFFFF;
2531         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2532                                                 0xFFFFFFFF;
2533         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2534         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2535         hdr->datasn             = cpu_to_be32(datain.data_sn);
2536         hdr->offset             = cpu_to_be32(datain.offset);
2537
2538         iov = &cmd->iov_data[0];
2539         iov[iov_count].iov_base = cmd->pdu;
2540         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2541         tx_size += ISCSI_HDR_LEN;
2542
2543         if (conn->conn_ops->HeaderDigest) {
2544                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2545
2546                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2547                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2548                                 0, NULL, (u8 *)header_digest);
2549
2550                 iov[0].iov_len += ISCSI_CRC_LEN;
2551                 tx_size += ISCSI_CRC_LEN;
2552
2553                 pr_debug("Attaching CRC32 HeaderDigest"
2554                         " for DataIN PDU 0x%08x\n", *header_digest);
2555         }
2556
2557         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2558         if (iov_ret < 0)
2559                 return -1;
2560
2561         iov_count += iov_ret;
2562         tx_size += datain.length;
2563
2564         cmd->padding = ((-datain.length) & 3);
2565         if (cmd->padding) {
2566                 iov[iov_count].iov_base         = cmd->pad_bytes;
2567                 iov[iov_count++].iov_len        = cmd->padding;
2568                 tx_size += cmd->padding;
2569
2570                 pr_debug("Attaching %u padding bytes\n",
2571                                 cmd->padding);
2572         }
2573         if (conn->conn_ops->DataDigest) {
2574                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2575                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2576
2577                 iov[iov_count].iov_base = &cmd->data_crc;
2578                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2579                 tx_size += ISCSI_CRC_LEN;
2580
2581                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2582                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2583         }
2584
2585         cmd->iov_data_count = iov_count;
2586         cmd->tx_size = tx_size;
2587
2588         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2589                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2590                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2591                 ntohl(hdr->offset), datain.length, conn->cid);
2592
2593         if (dr->dr_complete) {
2594                 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2595                                 2 : 1;
2596                 iscsit_free_datain_req(cmd, dr);
2597         }
2598
2599         return 0;
2600 }
2601
2602 static int iscsit_send_logout_response(
2603         struct iscsi_cmd *cmd,
2604         struct iscsi_conn *conn)
2605 {
2606         int niov = 0, tx_size;
2607         struct iscsi_conn *logout_conn = NULL;
2608         struct iscsi_conn_recovery *cr = NULL;
2609         struct iscsi_session *sess = conn->sess;
2610         struct kvec *iov;
2611         struct iscsi_logout_rsp *hdr;
2612         /*
2613          * The actual shutting down of Sessions and/or Connections
2614          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2615          * is done in scsi_logout_post_handler().
2616          */
2617         switch (cmd->logout_reason) {
2618         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2619                 pr_debug("iSCSI session logout successful, setting"
2620                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2621                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2622                 break;
2623         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2624                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2625                         break;
2626                 /*
2627                  * For CLOSECONNECTION logout requests carrying
2628                  * a matching logout CID -> local CID, the reference
2629                  * for the local CID will have been incremented in
2630                  * iscsi_logout_closeconnection().
2631                  *
2632                  * For CLOSECONNECTION logout requests carrying
2633                  * a different CID than the connection it arrived
2634                  * on, the connection responding to cmd->logout_cid
2635                  * is stopped in iscsit_logout_post_handler_diffcid().
2636                  */
2637
2638                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2639                         " successful.\n", cmd->logout_cid, conn->cid);
2640                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2641                 break;
2642         case ISCSI_LOGOUT_REASON_RECOVERY:
2643                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2644                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2645                         break;
2646                 /*
2647                  * If the connection is still active from our point of view
2648                  * force connection recovery to occur.
2649                  */
2650                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2651                                 cmd->logout_cid);
2652                 if ((logout_conn)) {
2653                         iscsit_connection_reinstatement_rcfr(logout_conn);
2654                         iscsit_dec_conn_usage_count(logout_conn);
2655                 }
2656
2657                 cr = iscsit_get_inactive_connection_recovery_entry(
2658                                 conn->sess, cmd->logout_cid);
2659                 if (!cr) {
2660                         pr_err("Unable to locate CID: %hu for"
2661                         " REMOVECONNFORRECOVERY Logout Request.\n",
2662                                 cmd->logout_cid);
2663                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2664                         break;
2665                 }
2666
2667                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2668
2669                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2670                         " for recovery for CID: %hu on CID: %hu successful.\n",
2671                                 cmd->logout_cid, conn->cid);
2672                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2673                 break;
2674         default:
2675                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2676                                 cmd->logout_reason);
2677                 return -1;
2678         }
2679
2680         tx_size = ISCSI_HDR_LEN;
2681         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2682         memset(hdr, 0, ISCSI_HDR_LEN);
2683         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2684         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2685         hdr->response           = cmd->logout_response;
2686         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2687         cmd->stat_sn            = conn->stat_sn++;
2688         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2689
2690         iscsit_increment_maxcmdsn(cmd, conn->sess);
2691         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2692         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2693
2694         iov = &cmd->iov_misc[0];
2695         iov[niov].iov_base      = cmd->pdu;
2696         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2697
2698         if (conn->conn_ops->HeaderDigest) {
2699                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2700
2701                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2702                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2703                                 0, NULL, (u8 *)header_digest);
2704
2705                 iov[0].iov_len += ISCSI_CRC_LEN;
2706                 tx_size += ISCSI_CRC_LEN;
2707                 pr_debug("Attaching CRC32C HeaderDigest to"
2708                         " Logout Response 0x%08x\n", *header_digest);
2709         }
2710         cmd->iov_misc_count = niov;
2711         cmd->tx_size = tx_size;
2712
2713         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2714                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2715                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2716                 cmd->logout_cid, conn->cid);
2717
2718         return 0;
2719 }
2720
2721 /*
2722  *      Unsolicited NOPIN, either requesting a response or not.
2723  */
2724 static int iscsit_send_unsolicited_nopin(
2725         struct iscsi_cmd *cmd,
2726         struct iscsi_conn *conn,
2727         int want_response)
2728 {
2729         int tx_size = ISCSI_HDR_LEN;
2730         struct iscsi_nopin *hdr;
2731
2732         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2733         memset(hdr, 0, ISCSI_HDR_LEN);
2734         hdr->opcode             = ISCSI_OP_NOOP_IN;
2735         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2736         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2737         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2738         cmd->stat_sn            = conn->stat_sn;
2739         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2740         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2741         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2742
2743         if (conn->conn_ops->HeaderDigest) {
2744                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2745
2746                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2747                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2748                                 0, NULL, (u8 *)header_digest);
2749
2750                 tx_size += ISCSI_CRC_LEN;
2751                 pr_debug("Attaching CRC32C HeaderDigest to"
2752                         " NopIN 0x%08x\n", *header_digest);
2753         }
2754
2755         cmd->iov_misc[0].iov_base       = cmd->pdu;
2756         cmd->iov_misc[0].iov_len        = tx_size;
2757         cmd->iov_misc_count     = 1;
2758         cmd->tx_size            = tx_size;
2759
2760         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2761                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2762
2763         return 0;
2764 }
2765
2766 static int iscsit_send_nopin_response(
2767         struct iscsi_cmd *cmd,
2768         struct iscsi_conn *conn)
2769 {
2770         int niov = 0, tx_size;
2771         u32 padding = 0;
2772         struct kvec *iov;
2773         struct iscsi_nopin *hdr;
2774
2775         tx_size = ISCSI_HDR_LEN;
2776         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2777         memset(hdr, 0, ISCSI_HDR_LEN);
2778         hdr->opcode             = ISCSI_OP_NOOP_IN;
2779         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2780         hton24(hdr->dlength, cmd->buf_ptr_size);
2781         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2782         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2783         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2784         cmd->stat_sn            = conn->stat_sn++;
2785         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2786
2787         iscsit_increment_maxcmdsn(cmd, conn->sess);
2788         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2789         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2790
2791         iov = &cmd->iov_misc[0];
2792         iov[niov].iov_base      = cmd->pdu;
2793         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2794
2795         if (conn->conn_ops->HeaderDigest) {
2796                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2797
2798                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2799                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2800                                 0, NULL, (u8 *)header_digest);
2801
2802                 iov[0].iov_len += ISCSI_CRC_LEN;
2803                 tx_size += ISCSI_CRC_LEN;
2804                 pr_debug("Attaching CRC32C HeaderDigest"
2805                         " to NopIn 0x%08x\n", *header_digest);
2806         }
2807
2808         /*
2809          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2810          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2811          */
2812         if (cmd->buf_ptr_size) {
2813                 iov[niov].iov_base      = cmd->buf_ptr;
2814                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2815                 tx_size += cmd->buf_ptr_size;
2816
2817                 pr_debug("Echoing back %u bytes of ping"
2818                         " data.\n", cmd->buf_ptr_size);
2819
2820                 padding = ((-cmd->buf_ptr_size) & 3);
2821                 if (padding != 0) {
2822                         iov[niov].iov_base = &cmd->pad_bytes;
2823                         iov[niov++].iov_len = padding;
2824                         tx_size += padding;
2825                         pr_debug("Attaching %u additional"
2826                                 " padding bytes.\n", padding);
2827                 }
2828                 if (conn->conn_ops->DataDigest) {
2829                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2830                                 cmd->buf_ptr, cmd->buf_ptr_size,
2831                                 padding, (u8 *)&cmd->pad_bytes,
2832                                 (u8 *)&cmd->data_crc);
2833
2834                         iov[niov].iov_base = &cmd->data_crc;
2835                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2836                         tx_size += ISCSI_CRC_LEN;
2837                         pr_debug("Attached DataDigest for %u"
2838                                 " bytes of ping data, CRC 0x%08x\n",
2839                                 cmd->buf_ptr_size, cmd->data_crc);
2840                 }
2841         }
2842
2843         cmd->iov_misc_count = niov;
2844         cmd->tx_size = tx_size;
2845
2846         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2847                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2848                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2849
2850         return 0;
2851 }
2852
2853 int iscsit_send_r2t(
2854         struct iscsi_cmd *cmd,
2855         struct iscsi_conn *conn)
2856 {
2857         int tx_size = 0;
2858         struct iscsi_r2t *r2t;
2859         struct iscsi_r2t_rsp *hdr;
2860
2861         r2t = iscsit_get_r2t_from_list(cmd);
2862         if (!r2t)
2863                 return -1;
2864
2865         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2866         memset(hdr, 0, ISCSI_HDR_LEN);
2867         hdr->opcode             = ISCSI_OP_R2T;
2868         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2869         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2870                         (struct scsi_lun *)&hdr->lun);
2871         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2872         spin_lock_bh(&conn->sess->ttt_lock);
2873         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2874         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2875                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2876         spin_unlock_bh(&conn->sess->ttt_lock);
2877         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2878         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2879         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2880         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2881         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2882         hdr->data_offset        = cpu_to_be32(r2t->offset);
2883         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2884
2885         cmd->iov_misc[0].iov_base       = cmd->pdu;
2886         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2887         tx_size += ISCSI_HDR_LEN;
2888
2889         if (conn->conn_ops->HeaderDigest) {
2890                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2891
2892                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2893                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2894                                 0, NULL, (u8 *)header_digest);
2895
2896                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2897                 tx_size += ISCSI_CRC_LEN;
2898                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2899                         " PDU 0x%08x\n", *header_digest);
2900         }
2901
2902         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2903                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2904                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2905                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2906                         r2t->offset, r2t->xfer_len, conn->cid);
2907
2908         cmd->iov_misc_count = 1;
2909         cmd->tx_size = tx_size;
2910
2911         spin_lock_bh(&cmd->r2t_lock);
2912         r2t->sent_r2t = 1;
2913         spin_unlock_bh(&cmd->r2t_lock);
2914
2915         return 0;
2916 }
2917
2918 /*
2919  *      type 0: Normal Operation.
2920  *      type 1: Called from Storage Transport.
2921  *      type 2: Called from iscsi_task_reassign_complete_write() for
2922  *              connection recovery.
2923  */
2924 int iscsit_build_r2ts_for_cmd(
2925         struct iscsi_cmd *cmd,
2926         struct iscsi_conn *conn,
2927         int type)
2928 {
2929         int first_r2t = 1;
2930         u32 offset = 0, xfer_len = 0;
2931
2932         spin_lock_bh(&cmd->r2t_lock);
2933         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2934                 spin_unlock_bh(&cmd->r2t_lock);
2935                 return 0;
2936         }
2937
2938         if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2939                 if (cmd->r2t_offset < cmd->write_data_done)
2940                         cmd->r2t_offset = cmd->write_data_done;
2941
2942         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2943                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2944                         offset = cmd->r2t_offset;
2945
2946                         if (first_r2t && (type == 2)) {
2947                                 xfer_len = ((offset +
2948                                              (conn->sess->sess_ops->MaxBurstLength -
2949                                              cmd->next_burst_len) >
2950                                              cmd->data_length) ?
2951                                             (cmd->data_length - offset) :
2952                                             (conn->sess->sess_ops->MaxBurstLength -
2953                                              cmd->next_burst_len));
2954                         } else {
2955                                 xfer_len = ((offset +
2956                                              conn->sess->sess_ops->MaxBurstLength) >
2957                                              cmd->data_length) ?
2958                                              (cmd->data_length - offset) :
2959                                              conn->sess->sess_ops->MaxBurstLength;
2960                         }
2961                         cmd->r2t_offset += xfer_len;
2962
2963                         if (cmd->r2t_offset == cmd->data_length)
2964                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2965                 } else {
2966                         struct iscsi_seq *seq;
2967
2968                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2969                         if (!seq) {
2970                                 spin_unlock_bh(&cmd->r2t_lock);
2971                                 return -1;
2972                         }
2973
2974                         offset = seq->offset;
2975                         xfer_len = seq->xfer_len;
2976
2977                         if (cmd->seq_send_order == cmd->seq_count)
2978                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2979                 }
2980                 cmd->outstanding_r2ts++;
2981                 first_r2t = 0;
2982
2983                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2984                         spin_unlock_bh(&cmd->r2t_lock);
2985                         return -1;
2986                 }
2987
2988                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2989                         break;
2990         }
2991         spin_unlock_bh(&cmd->r2t_lock);
2992
2993         return 0;
2994 }
2995
2996 static int iscsit_send_status(
2997         struct iscsi_cmd *cmd,
2998         struct iscsi_conn *conn)
2999 {
3000         u8 iov_count = 0, recovery;
3001         u32 padding = 0, tx_size = 0;
3002         struct iscsi_scsi_rsp *hdr;
3003         struct kvec *iov;
3004
3005         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3006         if (!recovery)
3007                 cmd->stat_sn = conn->stat_sn++;
3008
3009         spin_lock_bh(&conn->sess->session_stats_lock);
3010         conn->sess->rsp_pdus++;
3011         spin_unlock_bh(&conn->sess->session_stats_lock);
3012
3013         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3014         memset(hdr, 0, ISCSI_HDR_LEN);
3015         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3016         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3017         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3018                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3019                 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3020         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3021                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3022                 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3023         }
3024         hdr->response           = cmd->iscsi_response;
3025         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3026         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3027         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3028
3029         iscsit_increment_maxcmdsn(cmd, conn->sess);
3030         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3031         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3032
3033         iov = &cmd->iov_misc[0];
3034         iov[iov_count].iov_base = cmd->pdu;
3035         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3036         tx_size += ISCSI_HDR_LEN;
3037
3038         /*
3039          * Attach SENSE DATA payload to iSCSI Response PDU
3040          */
3041         if (cmd->se_cmd.sense_buffer &&
3042            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3043             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3044                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3045                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3046                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3047                 iov[iov_count++].iov_len =
3048                                 (cmd->se_cmd.scsi_sense_length + padding);
3049                 tx_size += cmd->se_cmd.scsi_sense_length;
3050
3051                 if (padding) {
3052                         memset(cmd->se_cmd.sense_buffer +
3053                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3054                         tx_size += padding;
3055                         pr_debug("Adding %u bytes of padding to"
3056                                 " SENSE.\n", padding);
3057                 }
3058
3059                 if (conn->conn_ops->DataDigest) {
3060                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3061                                 cmd->se_cmd.sense_buffer,
3062                                 (cmd->se_cmd.scsi_sense_length + padding),
3063                                 0, NULL, (u8 *)&cmd->data_crc);
3064
3065                         iov[iov_count].iov_base    = &cmd->data_crc;
3066                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3067                         tx_size += ISCSI_CRC_LEN;
3068
3069                         pr_debug("Attaching CRC32 DataDigest for"
3070                                 " SENSE, %u bytes CRC 0x%08x\n",
3071                                 (cmd->se_cmd.scsi_sense_length + padding),
3072                                 cmd->data_crc);
3073                 }
3074
3075                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3076                                 " Response PDU\n",
3077                                 cmd->se_cmd.scsi_sense_length);
3078         }
3079
3080         if (conn->conn_ops->HeaderDigest) {
3081                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3082
3083                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3084                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3085                                 0, NULL, (u8 *)header_digest);
3086
3087                 iov[0].iov_len += ISCSI_CRC_LEN;
3088                 tx_size += ISCSI_CRC_LEN;
3089                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3090                                 " PDU 0x%08x\n", *header_digest);
3091         }
3092
3093         cmd->iov_misc_count = iov_count;
3094         cmd->tx_size = tx_size;
3095
3096         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3097                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3098                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3099                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3100
3101         return 0;
3102 }
3103
3104 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3105 {
3106         switch (se_tmr->response) {
3107         case TMR_FUNCTION_COMPLETE:
3108                 return ISCSI_TMF_RSP_COMPLETE;
3109         case TMR_TASK_DOES_NOT_EXIST:
3110                 return ISCSI_TMF_RSP_NO_TASK;
3111         case TMR_LUN_DOES_NOT_EXIST:
3112                 return ISCSI_TMF_RSP_NO_LUN;
3113         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3114                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3115         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3116                 return ISCSI_TMF_RSP_AUTH_FAILED;
3117         case TMR_FUNCTION_REJECTED:
3118         default:
3119                 return ISCSI_TMF_RSP_REJECTED;
3120         }
3121 }
3122
3123 static int iscsit_send_task_mgt_rsp(
3124         struct iscsi_cmd *cmd,
3125         struct iscsi_conn *conn)
3126 {
3127         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3128         struct iscsi_tm_rsp *hdr;
3129         u32 tx_size = 0;
3130
3131         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3132         memset(hdr, 0, ISCSI_HDR_LEN);
3133         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3134         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3135         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3136         cmd->stat_sn            = conn->stat_sn++;
3137         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3138
3139         iscsit_increment_maxcmdsn(cmd, conn->sess);
3140         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3141         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3142
3143         cmd->iov_misc[0].iov_base       = cmd->pdu;
3144         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3145         tx_size += ISCSI_HDR_LEN;
3146
3147         if (conn->conn_ops->HeaderDigest) {
3148                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3149
3150                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3151                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3152                                 0, NULL, (u8 *)header_digest);
3153
3154                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3155                 tx_size += ISCSI_CRC_LEN;
3156                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3157                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3158         }
3159
3160         cmd->iov_misc_count = 1;
3161         cmd->tx_size = tx_size;
3162
3163         pr_debug("Built Task Management Response ITT: 0x%08x,"
3164                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3165                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3166
3167         return 0;
3168 }
3169
3170 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3171 {
3172         char *payload = NULL;
3173         struct iscsi_conn *conn = cmd->conn;
3174         struct iscsi_portal_group *tpg;
3175         struct iscsi_tiqn *tiqn;
3176         struct iscsi_tpg_np *tpg_np;
3177         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3178         unsigned char buf[256];
3179
3180         buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3181                         32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3182
3183         memset(buf, 0, 256);
3184
3185         payload = kzalloc(buffer_len, GFP_KERNEL);
3186         if (!payload) {
3187                 pr_err("Unable to allocate memory for sendtargets"
3188                                 " response.\n");
3189                 return -ENOMEM;
3190         }
3191
3192         spin_lock(&tiqn_lock);
3193         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3194                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3195                 len += 1;
3196
3197                 if ((len + payload_len) > buffer_len) {
3198                         spin_unlock(&tiqn->tiqn_tpg_lock);
3199                         end_of_buf = 1;
3200                         goto eob;
3201                 }
3202                 memcpy((void *)payload + payload_len, buf, len);
3203                 payload_len += len;
3204
3205                 spin_lock(&tiqn->tiqn_tpg_lock);
3206                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3207
3208                         spin_lock(&tpg->tpg_state_lock);
3209                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3210                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3211                                 spin_unlock(&tpg->tpg_state_lock);
3212                                 continue;
3213                         }
3214                         spin_unlock(&tpg->tpg_state_lock);
3215
3216                         spin_lock(&tpg->tpg_np_lock);
3217                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3218                                                 tpg_np_list) {
3219                                 len = sprintf(buf, "TargetAddress="
3220                                         "%s%s%s:%hu,%hu",
3221                                         (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3222                                         "[" : "", tpg_np->tpg_np->np_ip,
3223                                         (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3224                                         "]" : "", tpg_np->tpg_np->np_port,
3225                                         tpg->tpgt);
3226                                 len += 1;
3227
3228                                 if ((len + payload_len) > buffer_len) {
3229                                         spin_unlock(&tpg->tpg_np_lock);
3230                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3231                                         end_of_buf = 1;
3232                                         goto eob;
3233                                 }
3234                                 memcpy((void *)payload + payload_len, buf, len);
3235                                 payload_len += len;
3236                         }
3237                         spin_unlock(&tpg->tpg_np_lock);
3238                 }
3239                 spin_unlock(&tiqn->tiqn_tpg_lock);
3240 eob:
3241                 if (end_of_buf)
3242                         break;
3243         }
3244         spin_unlock(&tiqn_lock);
3245
3246         cmd->buf_ptr = payload;
3247
3248         return payload_len;
3249 }
3250
3251 /*
3252  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3253  *      MaxRecvDataSegmentLength.
3254  */
3255 static int iscsit_send_text_rsp(
3256         struct iscsi_cmd *cmd,
3257         struct iscsi_conn *conn)
3258 {
3259         struct iscsi_text_rsp *hdr;
3260         struct kvec *iov;
3261         u32 padding = 0, tx_size = 0;
3262         int text_length, iov_count = 0;
3263
3264         text_length = iscsit_build_sendtargets_response(cmd);
3265         if (text_length < 0)
3266                 return text_length;
3267
3268         padding = ((-text_length) & 3);
3269         if (padding != 0) {
3270                 memset(cmd->buf_ptr + text_length, 0, padding);
3271                 pr_debug("Attaching %u additional bytes for"
3272                         " padding.\n", padding);
3273         }
3274
3275         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3276         memset(hdr, 0, ISCSI_HDR_LEN);
3277         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3278         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3279         hton24(hdr->dlength, text_length);
3280         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3281         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3282         cmd->stat_sn            = conn->stat_sn++;
3283         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3284
3285         iscsit_increment_maxcmdsn(cmd, conn->sess);
3286         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3287         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3288
3289         iov = &cmd->iov_misc[0];
3290
3291         iov[iov_count].iov_base = cmd->pdu;
3292         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3293         iov[iov_count].iov_base = cmd->buf_ptr;
3294         iov[iov_count++].iov_len = text_length + padding;
3295
3296         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3297
3298         if (conn->conn_ops->HeaderDigest) {
3299                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3300
3301                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3302                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3303                                 0, NULL, (u8 *)header_digest);
3304
3305                 iov[0].iov_len += ISCSI_CRC_LEN;
3306                 tx_size += ISCSI_CRC_LEN;
3307                 pr_debug("Attaching CRC32 HeaderDigest for"
3308                         " Text Response PDU 0x%08x\n", *header_digest);
3309         }
3310
3311         if (conn->conn_ops->DataDigest) {
3312                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3313                                 cmd->buf_ptr, (text_length + padding),
3314                                 0, NULL, (u8 *)&cmd->data_crc);
3315
3316                 iov[iov_count].iov_base = &cmd->data_crc;
3317                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3318                 tx_size += ISCSI_CRC_LEN;
3319
3320                 pr_debug("Attaching DataDigest for %u bytes of text"
3321                         " data, CRC 0x%08x\n", (text_length + padding),
3322                         cmd->data_crc);
3323         }
3324
3325         cmd->iov_misc_count = iov_count;
3326         cmd->tx_size = tx_size;
3327
3328         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3329                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3330                         text_length, conn->cid);
3331         return 0;
3332 }
3333
3334 static int iscsit_send_reject(
3335         struct iscsi_cmd *cmd,
3336         struct iscsi_conn *conn)
3337 {
3338         u32 iov_count = 0, tx_size = 0;
3339         struct iscsi_reject *hdr;
3340         struct kvec *iov;
3341
3342         hdr                     = (struct iscsi_reject *) cmd->pdu;
3343         hdr->opcode             = ISCSI_OP_REJECT;
3344         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3345         hton24(hdr->dlength, ISCSI_HDR_LEN);
3346         cmd->stat_sn            = conn->stat_sn++;
3347         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3348         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3349         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3350
3351         iov = &cmd->iov_misc[0];
3352
3353         iov[iov_count].iov_base = cmd->pdu;
3354         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3355         iov[iov_count].iov_base = cmd->buf_ptr;
3356         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3357
3358         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3359
3360         if (conn->conn_ops->HeaderDigest) {
3361                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3362
3363                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3364                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3365                                 0, NULL, (u8 *)header_digest);
3366
3367                 iov[0].iov_len += ISCSI_CRC_LEN;
3368                 tx_size += ISCSI_CRC_LEN;
3369                 pr_debug("Attaching CRC32 HeaderDigest for"
3370                         " REJECT PDU 0x%08x\n", *header_digest);
3371         }
3372
3373         if (conn->conn_ops->DataDigest) {
3374                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3375                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3376                                 0, NULL, (u8 *)&cmd->data_crc);
3377
3378                 iov[iov_count].iov_base = &cmd->data_crc;
3379                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3380                 tx_size += ISCSI_CRC_LEN;
3381                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3382                                 " PDU 0x%08x\n", cmd->data_crc);
3383         }
3384
3385         cmd->iov_misc_count = iov_count;
3386         cmd->tx_size = tx_size;
3387
3388         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3389                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3390
3391         return 0;
3392 }
3393
3394 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3395 {
3396         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3397             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3398                 wait_for_completion_interruptible_timeout(
3399                                         &conn->tx_half_close_comp,
3400                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3401         }
3402 }
3403
3404 #ifdef CONFIG_SMP
3405
3406 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3407 {
3408         struct iscsi_thread_set *ts = conn->thread_set;
3409         int ord, cpu;
3410         /*
3411          * thread_id is assigned from iscsit_global->ts_bitmap from
3412          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3413          *
3414          * Here we use thread_id to determine which CPU that this
3415          * iSCSI connection's iscsi_thread_set will be scheduled to
3416          * execute upon.
3417          */
3418         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3419 #if 0
3420         pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3421                         " thread_id: %d\n", ord, ts->thread_id);
3422 #endif
3423         for_each_online_cpu(cpu) {
3424                 if (ord-- == 0) {
3425                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3426                         return;
3427                 }
3428         }
3429         /*
3430          * This should never be reached..
3431          */
3432         dump_stack();
3433         cpumask_setall(conn->conn_cpumask);
3434 }
3435
3436 static inline void iscsit_thread_check_cpumask(
3437         struct iscsi_conn *conn,
3438         struct task_struct *p,
3439         int mode)
3440 {
3441         char buf[128];
3442         /*
3443          * mode == 1 signals iscsi_target_tx_thread() usage.
3444          * mode == 0 signals iscsi_target_rx_thread() usage.
3445          */
3446         if (mode == 1) {
3447                 if (!conn->conn_tx_reset_cpumask)
3448                         return;
3449                 conn->conn_tx_reset_cpumask = 0;
3450         } else {
3451                 if (!conn->conn_rx_reset_cpumask)
3452                         return;
3453                 conn->conn_rx_reset_cpumask = 0;
3454         }
3455         /*
3456          * Update the CPU mask for this single kthread so that
3457          * both TX and RX kthreads are scheduled to run on the
3458          * same CPU.
3459          */
3460         memset(buf, 0, 128);
3461         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3462 #if 0
3463         pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3464                         " %s for %s\n", buf, p->comm);
3465 #endif
3466         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3467 }
3468
3469 #else
3470
3471 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3472 {
3473         return;
3474 }
3475
3476 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3477 #endif /* CONFIG_SMP */
3478
3479 int iscsi_target_tx_thread(void *arg)
3480 {
3481         u8 state;
3482         int eodr = 0;
3483         int ret = 0;
3484         int sent_status = 0;
3485         int use_misc = 0;
3486         int map_sg = 0;
3487         struct iscsi_cmd *cmd = NULL;
3488         struct iscsi_conn *conn;
3489         struct iscsi_queue_req *qr = NULL;
3490         struct se_cmd *se_cmd;
3491         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3492         /*
3493          * Allow ourselves to be interrupted by SIGINT so that a
3494          * connection recovery / failure event can be triggered externally.
3495          */
3496         allow_signal(SIGINT);
3497
3498 restart:
3499         conn = iscsi_tx_thread_pre_handler(ts);
3500         if (!conn)
3501                 goto out;
3502
3503         eodr = map_sg = ret = sent_status = use_misc = 0;
3504
3505         while (!kthread_should_stop()) {
3506                 /*
3507                  * Ensure that both TX and RX per connection kthreads
3508                  * are scheduled to run on the same CPU.
3509                  */
3510                 iscsit_thread_check_cpumask(conn, current, 1);
3511
3512                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3513
3514                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3515                      signal_pending(current))
3516                         goto transport_err;
3517
3518 get_immediate:
3519                 qr = iscsit_get_cmd_from_immediate_queue(conn);
3520                 if (qr) {
3521                         atomic_set(&conn->check_immediate_queue, 0);
3522                         cmd = qr->cmd;
3523                         state = qr->state;
3524                         kmem_cache_free(lio_qr_cache, qr);
3525
3526                         spin_lock_bh(&cmd->istate_lock);
3527                         switch (state) {
3528                         case ISTATE_SEND_R2T:
3529                                 spin_unlock_bh(&cmd->istate_lock);
3530                                 ret = iscsit_send_r2t(cmd, conn);
3531                                 break;
3532                         case ISTATE_REMOVE:
3533                                 spin_unlock_bh(&cmd->istate_lock);
3534
3535                                 if (cmd->data_direction == DMA_TO_DEVICE)
3536                                         iscsit_stop_dataout_timer(cmd);
3537
3538                                 spin_lock_bh(&conn->cmd_lock);
3539                                 list_del(&cmd->i_list);
3540                                 spin_unlock_bh(&conn->cmd_lock);
3541                                 /*
3542                                  * Determine if a struct se_cmd is assoicated with
3543                                  * this struct iscsi_cmd.
3544                                  */
3545                                 if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) &&
3546                                     !(cmd->tmr_req))
3547                                         iscsit_release_cmd(cmd);
3548                                 else
3549                                         transport_generic_free_cmd(&cmd->se_cmd,
3550                                                                 1, 0);
3551                                 goto get_immediate;
3552                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3553                                 spin_unlock_bh(&cmd->istate_lock);
3554                                 iscsit_mod_nopin_response_timer(conn);
3555                                 ret = iscsit_send_unsolicited_nopin(cmd,
3556                                                 conn, 1);
3557                                 break;
3558                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3559                                 spin_unlock_bh(&cmd->istate_lock);
3560                                 ret = iscsit_send_unsolicited_nopin(cmd,
3561                                                 conn, 0);
3562                                 break;
3563                         default:
3564                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3565                                 " 0x%08x, i_state: %d on CID: %hu\n",
3566                                 cmd->iscsi_opcode, cmd->init_task_tag, state,
3567                                 conn->cid);
3568                                 spin_unlock_bh(&cmd->istate_lock);
3569                                 goto transport_err;
3570                         }
3571                         if (ret < 0) {
3572                                 conn->tx_immediate_queue = 0;
3573                                 goto transport_err;
3574                         }
3575
3576                         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3577                                 conn->tx_immediate_queue = 0;
3578                                 iscsit_tx_thread_wait_for_tcp(conn);
3579                                 goto transport_err;
3580                         }
3581
3582                         spin_lock_bh(&cmd->istate_lock);
3583                         switch (state) {
3584                         case ISTATE_SEND_R2T:
3585                                 spin_unlock_bh(&cmd->istate_lock);
3586                                 spin_lock_bh(&cmd->dataout_timeout_lock);
3587                                 iscsit_start_dataout_timer(cmd, conn);
3588                                 spin_unlock_bh(&cmd->dataout_timeout_lock);
3589                                 break;
3590                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3591                                 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3592                                 spin_unlock_bh(&cmd->istate_lock);
3593                                 break;
3594                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3595                                 cmd->i_state = ISTATE_SENT_STATUS;
3596                                 spin_unlock_bh(&cmd->istate_lock);
3597                                 break;
3598                         default:
3599                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3600                                         " 0x%08x, i_state: %d on CID: %hu\n",
3601                                         cmd->iscsi_opcode, cmd->init_task_tag,
3602                                         state, conn->cid);
3603                                 spin_unlock_bh(&cmd->istate_lock);
3604                                 goto transport_err;
3605                         }
3606                         goto get_immediate;
3607                 } else
3608                         conn->tx_immediate_queue = 0;
3609
3610 get_response:
3611                 qr = iscsit_get_cmd_from_response_queue(conn);
3612                 if (qr) {
3613                         cmd = qr->cmd;
3614                         state = qr->state;
3615                         kmem_cache_free(lio_qr_cache, qr);
3616
3617                         spin_lock_bh(&cmd->istate_lock);
3618 check_rsp_state:
3619                         switch (state) {
3620                         case ISTATE_SEND_DATAIN:
3621                                 spin_unlock_bh(&cmd->istate_lock);
3622                                 ret = iscsit_send_data_in(cmd, conn,
3623                                                           &eodr);
3624                                 map_sg = 1;
3625                                 break;
3626                         case ISTATE_SEND_STATUS:
3627                         case ISTATE_SEND_STATUS_RECOVERY:
3628                                 spin_unlock_bh(&cmd->istate_lock);
3629                                 use_misc = 1;
3630                                 ret = iscsit_send_status(cmd, conn);
3631                                 break;
3632                         case ISTATE_SEND_LOGOUTRSP:
3633                                 spin_unlock_bh(&cmd->istate_lock);
3634                                 use_misc = 1;
3635                                 ret = iscsit_send_logout_response(cmd, conn);
3636                                 break;
3637                         case ISTATE_SEND_ASYNCMSG:
3638                                 spin_unlock_bh(&cmd->istate_lock);
3639                                 use_misc = 1;
3640                                 ret = iscsit_send_conn_drop_async_message(
3641                                                 cmd, conn);
3642                                 break;
3643                         case ISTATE_SEND_NOPIN:
3644                                 spin_unlock_bh(&cmd->istate_lock);
3645                                 use_misc = 1;
3646                                 ret = iscsit_send_nopin_response(cmd, conn);
3647                                 break;
3648                         case ISTATE_SEND_REJECT:
3649                                 spin_unlock_bh(&cmd->istate_lock);
3650                                 use_misc = 1;
3651                                 ret = iscsit_send_reject(cmd, conn);
3652                                 break;
3653                         case ISTATE_SEND_TASKMGTRSP:
3654                                 spin_unlock_bh(&cmd->istate_lock);
3655                                 use_misc = 1;
3656                                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3657                                 if (ret != 0)
3658                                         break;
3659                                 ret = iscsit_tmr_post_handler(cmd, conn);
3660                                 if (ret != 0)
3661                                         iscsit_fall_back_to_erl0(conn->sess);
3662                                 break;
3663                         case ISTATE_SEND_TEXTRSP:
3664                                 spin_unlock_bh(&cmd->istate_lock);
3665                                 use_misc = 1;
3666                                 ret = iscsit_send_text_rsp(cmd, conn);
3667                                 break;
3668                         default:
3669                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3670                                         " 0x%08x, i_state: %d on CID: %hu\n",
3671                                         cmd->iscsi_opcode, cmd->init_task_tag,
3672                                         state, conn->cid);
3673                                 spin_unlock_bh(&cmd->istate_lock);
3674                                 goto transport_err;
3675                         }
3676                         if (ret < 0) {
3677                                 conn->tx_response_queue = 0;
3678                                 goto transport_err;
3679                         }
3680
3681                         se_cmd = &cmd->se_cmd;
3682
3683                         if (map_sg && !conn->conn_ops->IFMarker) {
3684                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3685                                         conn->tx_response_queue = 0;
3686                                         iscsit_tx_thread_wait_for_tcp(conn);
3687                                         iscsit_unmap_iovec(cmd);
3688                                         goto transport_err;
3689                                 }
3690                         } else {
3691                                 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3692                                         conn->tx_response_queue = 0;
3693                                         iscsit_tx_thread_wait_for_tcp(conn);
3694                                         iscsit_unmap_iovec(cmd);
3695                                         goto transport_err;
3696                                 }
3697                         }
3698                         map_sg = 0;
3699                         iscsit_unmap_iovec(cmd);
3700
3701                         spin_lock_bh(&cmd->istate_lock);
3702                         switch (state) {
3703                         case ISTATE_SEND_DATAIN:
3704                                 if (!eodr)
3705                                         goto check_rsp_state;
3706
3707                                 if (eodr == 1) {
3708                                         cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3709                                         sent_status = 1;
3710                                         eodr = use_misc = 0;
3711                                 } else if (eodr == 2) {
3712                                         cmd->i_state = state =
3713                                                         ISTATE_SEND_STATUS;
3714                                         sent_status = 0;
3715                                         eodr = use_misc = 0;
3716                                         goto check_rsp_state;
3717                                 }
3718                                 break;
3719                         case ISTATE_SEND_STATUS:
3720                                 use_misc = 0;
3721                                 sent_status = 1;
3722                                 break;
3723                         case ISTATE_SEND_ASYNCMSG:
3724                         case ISTATE_SEND_NOPIN:
3725                         case ISTATE_SEND_STATUS_RECOVERY:
3726                         case ISTATE_SEND_TEXTRSP:
3727                                 use_misc = 0;
3728                                 sent_status = 1;
3729                                 break;
3730                         case ISTATE_SEND_REJECT:
3731                                 use_misc = 0;
3732                                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3733                                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3734                                         spin_unlock_bh(&cmd->istate_lock);
3735                                         complete(&cmd->reject_comp);
3736                                         goto transport_err;
3737                                 }
3738                                 complete(&cmd->reject_comp);
3739                                 break;
3740                         case ISTATE_SEND_TASKMGTRSP:
3741                                 use_misc = 0;
3742                                 sent_status = 1;
3743                                 break;
3744                         case ISTATE_SEND_LOGOUTRSP:
3745                                 spin_unlock_bh(&cmd->istate_lock);
3746                                 if (!iscsit_logout_post_handler(cmd, conn))
3747                                         goto restart;
3748                                 spin_lock_bh(&cmd->istate_lock);
3749                                 use_misc = 0;
3750                                 sent_status = 1;
3751                                 break;
3752                         default:
3753                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3754                                         " 0x%08x, i_state: %d on CID: %hu\n",
3755                                         cmd->iscsi_opcode, cmd->init_task_tag,
3756                                         cmd->i_state, conn->cid);
3757                                 spin_unlock_bh(&cmd->istate_lock);
3758                                 goto transport_err;
3759                         }
3760
3761                         if (sent_status) {
3762                                 cmd->i_state = ISTATE_SENT_STATUS;
3763                                 sent_status = 0;
3764                         }
3765                         spin_unlock_bh(&cmd->istate_lock);
3766
3767                         if (atomic_read(&conn->check_immediate_queue))
3768                                 goto get_immediate;
3769
3770                         goto get_response;
3771                 } else
3772                         conn->tx_response_queue = 0;
3773         }
3774
3775 transport_err:
3776         iscsit_take_action_for_connection_exit(conn);
3777         goto restart;
3778 out:
3779         return 0;
3780 }
3781
3782 int iscsi_target_rx_thread(void *arg)
3783 {
3784         int ret;
3785         u8 buffer[ISCSI_HDR_LEN], opcode;
3786         u32 checksum = 0, digest = 0;
3787         struct iscsi_conn *conn = NULL;
3788         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3789         struct kvec iov;
3790         /*
3791          * Allow ourselves to be interrupted by SIGINT so that a
3792          * connection recovery / failure event can be triggered externally.
3793          */
3794         allow_signal(SIGINT);
3795
3796 restart:
3797         conn = iscsi_rx_thread_pre_handler(ts);
3798         if (!conn)
3799                 goto out;
3800
3801         while (!kthread_should_stop()) {
3802                 /*
3803                  * Ensure that both TX and RX per connection kthreads
3804                  * are scheduled to run on the same CPU.
3805                  */
3806                 iscsit_thread_check_cpumask(conn, current, 0);
3807
3808                 memset(buffer, 0, ISCSI_HDR_LEN);
3809                 memset(&iov, 0, sizeof(struct kvec));
3810
3811                 iov.iov_base    = buffer;
3812                 iov.iov_len     = ISCSI_HDR_LEN;
3813
3814                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3815                 if (ret != ISCSI_HDR_LEN) {
3816                         iscsit_rx_thread_wait_for_tcp(conn);
3817                         goto transport_err;
3818                 }
3819
3820                 /*
3821                  * Set conn->bad_hdr for use with REJECT PDUs.
3822                  */
3823                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3824
3825                 if (conn->conn_ops->HeaderDigest) {
3826                         iov.iov_base    = &digest;
3827                         iov.iov_len     = ISCSI_CRC_LEN;
3828
3829                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3830                         if (ret != ISCSI_CRC_LEN) {
3831                                 iscsit_rx_thread_wait_for_tcp(conn);
3832                                 goto transport_err;
3833                         }
3834
3835                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3836                                         buffer, ISCSI_HDR_LEN,
3837                                         0, NULL, (u8 *)&checksum);
3838
3839                         if (digest != checksum) {
3840                                 pr_err("HeaderDigest CRC32C failed,"
3841                                         " received 0x%08x, computed 0x%08x\n",
3842                                         digest, checksum);
3843                                 /*
3844                                  * Set the PDU to 0xff so it will intentionally
3845                                  * hit default in the switch below.
3846                                  */
3847                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3848                                 spin_lock_bh(&conn->sess->session_stats_lock);
3849                                 conn->sess->conn_digest_errors++;
3850                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3851                         } else {
3852                                 pr_debug("Got HeaderDigest CRC32C"
3853                                                 " 0x%08x\n", checksum);
3854                         }
3855                 }
3856
3857                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3858                         goto transport_err;
3859
3860                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3861
3862                 if (conn->sess->sess_ops->SessionType &&
3863                    ((!(opcode & ISCSI_OP_TEXT)) ||
3864                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3865                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3866                         " while in Discovery Session, rejecting.\n", opcode);
3867                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3868                                         buffer, conn);
3869                         goto transport_err;
3870                 }
3871
3872                 switch (opcode) {
3873                 case ISCSI_OP_SCSI_CMD:
3874                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3875                                 goto transport_err;
3876                         break;
3877                 case ISCSI_OP_SCSI_DATA_OUT:
3878                         if (iscsit_handle_data_out(conn, buffer) < 0)
3879                                 goto transport_err;
3880                         break;
3881                 case ISCSI_OP_NOOP_OUT:
3882                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3883                                 goto transport_err;
3884                         break;
3885                 case ISCSI_OP_SCSI_TMFUNC:
3886                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3887                                 goto transport_err;
3888                         break;
3889                 case ISCSI_OP_TEXT:
3890                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3891                                 goto transport_err;
3892                         break;
3893                 case ISCSI_OP_LOGOUT:
3894                         ret = iscsit_handle_logout_cmd(conn, buffer);
3895                         if (ret > 0) {
3896                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3897                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3898                                 goto transport_err;
3899                         } else if (ret < 0)
3900                                 goto transport_err;
3901                         break;
3902                 case ISCSI_OP_SNACK:
3903                         if (iscsit_handle_snack(conn, buffer) < 0)
3904                                 goto transport_err;
3905                         break;
3906                 default:
3907                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3908                                         opcode);
3909                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3910                                 pr_err("Cannot recover from unknown"
3911                                 " opcode while ERL=0, closing iSCSI connection"
3912                                 ".\n");
3913                                 goto transport_err;
3914                         }
3915                         if (!conn->conn_ops->OFMarker) {
3916                                 pr_err("Unable to recover from unknown"
3917                                 " opcode while OFMarker=No, closing iSCSI"
3918                                         " connection.\n");
3919                                 goto transport_err;
3920                         }
3921                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3922                                 pr_err("Unable to recover from unknown"
3923                                         " opcode, closing iSCSI connection.\n");
3924                                 goto transport_err;
3925                         }
3926                         break;
3927                 }
3928         }
3929
3930 transport_err:
3931         if (!signal_pending(current))
3932                 atomic_set(&conn->transport_failed, 1);
3933         iscsit_take_action_for_connection_exit(conn);
3934         goto restart;
3935 out:
3936         return 0;
3937 }
3938
3939 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3940 {
3941         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3942         struct iscsi_session *sess = conn->sess;
3943         struct se_cmd *se_cmd;
3944         /*
3945          * We expect this function to only ever be called from either RX or TX
3946          * thread context via iscsit_close_connection() once the other context
3947          * has been reset -> returned sleeping pre-handler state.
3948          */
3949         spin_lock_bh(&conn->cmd_lock);
3950         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3951                 if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) {
3952
3953                         list_del(&cmd->i_list);
3954                         spin_unlock_bh(&conn->cmd_lock);
3955                         iscsit_increment_maxcmdsn(cmd, sess);
3956                         se_cmd = &cmd->se_cmd;
3957                         /*
3958                          * Special cases for active iSCSI TMR, and
3959                          * transport_lookup_cmd_lun() failing from
3960                          * iscsit_get_lun_for_cmd() in iscsit_handle_scsi_cmd().
3961                          */
3962                         if (cmd->tmr_req && se_cmd->transport_wait_for_tasks)
3963                                 se_cmd->transport_wait_for_tasks(se_cmd, 1, 1);
3964                         else if (cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)
3965                                 transport_release_cmd(se_cmd);
3966                         else
3967                                 iscsit_release_cmd(cmd);
3968
3969                         spin_lock_bh(&conn->cmd_lock);
3970                         continue;
3971                 }
3972                 list_del(&cmd->i_list);
3973                 spin_unlock_bh(&conn->cmd_lock);
3974
3975                 iscsit_increment_maxcmdsn(cmd, sess);
3976                 se_cmd = &cmd->se_cmd;
3977
3978                 if (se_cmd->transport_wait_for_tasks)
3979                         se_cmd->transport_wait_for_tasks(se_cmd, 1, 1);
3980
3981                 spin_lock_bh(&conn->cmd_lock);
3982         }
3983         spin_unlock_bh(&conn->cmd_lock);
3984 }
3985
3986 static void iscsit_stop_timers_for_cmds(
3987         struct iscsi_conn *conn)
3988 {
3989         struct iscsi_cmd *cmd;
3990
3991         spin_lock_bh(&conn->cmd_lock);
3992         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3993                 if (cmd->data_direction == DMA_TO_DEVICE)
3994                         iscsit_stop_dataout_timer(cmd);
3995         }
3996         spin_unlock_bh(&conn->cmd_lock);
3997 }
3998
3999 int iscsit_close_connection(
4000         struct iscsi_conn *conn)
4001 {
4002         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4003         struct iscsi_session    *sess = conn->sess;
4004
4005         pr_debug("Closing iSCSI connection CID %hu on SID:"
4006                 " %u\n", conn->cid, sess->sid);
4007         /*
4008          * Always up conn_logout_comp just in case the RX Thread is sleeping
4009          * and the logout response never got sent because the connection
4010          * failed.
4011          */
4012         complete(&conn->conn_logout_comp);
4013
4014         iscsi_release_thread_set(conn);
4015
4016         iscsit_stop_timers_for_cmds(conn);
4017         iscsit_stop_nopin_response_timer(conn);
4018         iscsit_stop_nopin_timer(conn);
4019         iscsit_free_queue_reqs_for_conn(conn);
4020
4021         /*
4022          * During Connection recovery drop unacknowledged out of order
4023          * commands for this connection, and prepare the other commands
4024          * for realligence.
4025          *
4026          * During normal operation clear the out of order commands (but
4027          * do not free the struct iscsi_ooo_cmdsn's) and release all
4028          * struct iscsi_cmds.
4029          */
4030         if (atomic_read(&conn->connection_recovery)) {
4031                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4032                 iscsit_prepare_cmds_for_realligance(conn);
4033         } else {
4034                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4035                 iscsit_release_commands_from_conn(conn);
4036         }
4037
4038         /*
4039          * Handle decrementing session or connection usage count if
4040          * a logout response was not able to be sent because the
4041          * connection failed.  Fall back to Session Recovery here.
4042          */
4043         if (atomic_read(&conn->conn_logout_remove)) {
4044                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4045                         iscsit_dec_conn_usage_count(conn);
4046                         iscsit_dec_session_usage_count(sess);
4047                 }
4048                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4049                         iscsit_dec_conn_usage_count(conn);
4050
4051                 atomic_set(&conn->conn_logout_remove, 0);
4052                 atomic_set(&sess->session_reinstatement, 0);
4053                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4054         }
4055
4056         spin_lock_bh(&sess->conn_lock);
4057         list_del(&conn->conn_list);
4058
4059         /*
4060          * Attempt to let the Initiator know this connection failed by
4061          * sending an Connection Dropped Async Message on another
4062          * active connection.
4063          */
4064         if (atomic_read(&conn->connection_recovery))
4065                 iscsit_build_conn_drop_async_message(conn);
4066
4067         spin_unlock_bh(&sess->conn_lock);
4068
4069         /*
4070          * If connection reinstatement is being performed on this connection,
4071          * up the connection reinstatement semaphore that is being blocked on
4072          * in iscsit_cause_connection_reinstatement().
4073          */
4074         spin_lock_bh(&conn->state_lock);
4075         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4076                 spin_unlock_bh(&conn->state_lock);
4077                 complete(&conn->conn_wait_comp);
4078                 wait_for_completion(&conn->conn_post_wait_comp);
4079                 spin_lock_bh(&conn->state_lock);
4080         }
4081
4082         /*
4083          * If connection reinstatement is being performed on this connection
4084          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4085          * connection wait rcfr semaphore that is being blocked on
4086          * an iscsit_connection_reinstatement_rcfr().
4087          */
4088         if (atomic_read(&conn->connection_wait_rcfr)) {
4089                 spin_unlock_bh(&conn->state_lock);
4090                 complete(&conn->conn_wait_rcfr_comp);
4091                 wait_for_completion(&conn->conn_post_wait_comp);
4092                 spin_lock_bh(&conn->state_lock);
4093         }
4094         atomic_set(&conn->connection_reinstatement, 1);
4095         spin_unlock_bh(&conn->state_lock);
4096
4097         /*
4098          * If any other processes are accessing this connection pointer we
4099          * must wait until they have completed.
4100          */
4101         iscsit_check_conn_usage_count(conn);
4102
4103         if (conn->conn_rx_hash.tfm)
4104                 crypto_free_hash(conn->conn_rx_hash.tfm);
4105         if (conn->conn_tx_hash.tfm)
4106                 crypto_free_hash(conn->conn_tx_hash.tfm);
4107
4108         if (conn->conn_cpumask)
4109                 free_cpumask_var(conn->conn_cpumask);
4110
4111         kfree(conn->conn_ops);
4112         conn->conn_ops = NULL;
4113
4114         if (conn->sock) {
4115                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4116                         kfree(conn->sock->file);
4117                         conn->sock->file = NULL;
4118                 }
4119                 sock_release(conn->sock);
4120         }
4121         conn->thread_set = NULL;
4122
4123         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4124         conn->conn_state = TARG_CONN_STATE_FREE;
4125         kfree(conn);
4126
4127         spin_lock_bh(&sess->conn_lock);
4128         atomic_dec(&sess->nconn);
4129         pr_debug("Decremented iSCSI connection count to %hu from node:"
4130                 " %s\n", atomic_read(&sess->nconn),
4131                 sess->sess_ops->InitiatorName);
4132         /*
4133          * Make sure that if one connection fails in an non ERL=2 iSCSI
4134          * Session that they all fail.
4135          */
4136         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4137              !atomic_read(&sess->session_logout))
4138                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4139
4140         /*
4141          * If this was not the last connection in the session, and we are
4142          * performing session reinstatement or falling back to ERL=0, call
4143          * iscsit_stop_session() without sleeping to shutdown the other
4144          * active connections.
4145          */
4146         if (atomic_read(&sess->nconn)) {
4147                 if (!atomic_read(&sess->session_reinstatement) &&
4148                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4149                         spin_unlock_bh(&sess->conn_lock);
4150                         return 0;
4151                 }
4152                 if (!atomic_read(&sess->session_stop_active)) {
4153                         atomic_set(&sess->session_stop_active, 1);
4154                         spin_unlock_bh(&sess->conn_lock);
4155                         iscsit_stop_session(sess, 0, 0);
4156                         return 0;
4157                 }
4158                 spin_unlock_bh(&sess->conn_lock);
4159                 return 0;
4160         }
4161
4162         /*
4163          * If this was the last connection in the session and one of the
4164          * following is occurring:
4165          *
4166          * Session Reinstatement is not being performed, and are falling back
4167          * to ERL=0 call iscsit_close_session().
4168          *
4169          * Session Logout was requested.  iscsit_close_session() will be called
4170          * elsewhere.
4171          *
4172          * Session Continuation is not being performed, start the Time2Retain
4173          * handler and check if sleep_on_sess_wait_sem is active.
4174          */
4175         if (!atomic_read(&sess->session_reinstatement) &&
4176              atomic_read(&sess->session_fall_back_to_erl0)) {
4177                 spin_unlock_bh(&sess->conn_lock);
4178                 iscsit_close_session(sess);
4179
4180                 return 0;
4181         } else if (atomic_read(&sess->session_logout)) {
4182                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4183                 sess->session_state = TARG_SESS_STATE_FREE;
4184                 spin_unlock_bh(&sess->conn_lock);
4185
4186                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4187                         complete(&sess->session_wait_comp);
4188
4189                 return 0;
4190         } else {
4191                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4192                 sess->session_state = TARG_SESS_STATE_FAILED;
4193
4194                 if (!atomic_read(&sess->session_continuation)) {
4195                         spin_unlock_bh(&sess->conn_lock);
4196                         iscsit_start_time2retain_handler(sess);
4197                 } else
4198                         spin_unlock_bh(&sess->conn_lock);
4199
4200                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4201                         complete(&sess->session_wait_comp);
4202
4203                 return 0;
4204         }
4205         spin_unlock_bh(&sess->conn_lock);
4206
4207         return 0;
4208 }
4209
4210 int iscsit_close_session(struct iscsi_session *sess)
4211 {
4212         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4213         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4214
4215         if (atomic_read(&sess->nconn)) {
4216                 pr_err("%d connection(s) still exist for iSCSI session"
4217                         " to %s\n", atomic_read(&sess->nconn),
4218                         sess->sess_ops->InitiatorName);
4219                 BUG();
4220         }
4221
4222         spin_lock_bh(&se_tpg->session_lock);
4223         atomic_set(&sess->session_logout, 1);
4224         atomic_set(&sess->session_reinstatement, 1);
4225         iscsit_stop_time2retain_timer(sess);
4226         spin_unlock_bh(&se_tpg->session_lock);
4227
4228         /*
4229          * transport_deregister_session_configfs() will clear the
4230          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4231          * can be setting it again with __transport_register_session() in
4232          * iscsi_post_login_handler() again after the iscsit_stop_session()
4233          * completes in iscsi_np context.
4234          */
4235         transport_deregister_session_configfs(sess->se_sess);
4236
4237         /*
4238          * If any other processes are accessing this session pointer we must
4239          * wait until they have completed.  If we are in an interrupt (the
4240          * time2retain handler) and contain and active session usage count we
4241          * restart the timer and exit.
4242          */
4243         if (!in_interrupt()) {
4244                 if (iscsit_check_session_usage_count(sess) == 1)
4245                         iscsit_stop_session(sess, 1, 1);
4246         } else {
4247                 if (iscsit_check_session_usage_count(sess) == 2) {
4248                         atomic_set(&sess->session_logout, 0);
4249                         iscsit_start_time2retain_handler(sess);
4250                         return 0;
4251                 }
4252         }
4253
4254         transport_deregister_session(sess->se_sess);
4255
4256         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4257                 iscsit_free_connection_recovery_entires(sess);
4258
4259         iscsit_free_all_ooo_cmdsns(sess);
4260
4261         spin_lock_bh(&se_tpg->session_lock);
4262         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4263         sess->session_state = TARG_SESS_STATE_FREE;
4264         pr_debug("Released iSCSI session from node: %s\n",
4265                         sess->sess_ops->InitiatorName);
4266         tpg->nsessions--;
4267         if (tpg->tpg_tiqn)
4268                 tpg->tpg_tiqn->tiqn_nsessions--;
4269
4270         pr_debug("Decremented number of active iSCSI Sessions on"
4271                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4272
4273         spin_lock(&sess_idr_lock);
4274         idr_remove(&sess_idr, sess->session_index);
4275         spin_unlock(&sess_idr_lock);
4276
4277         kfree(sess->sess_ops);
4278         sess->sess_ops = NULL;
4279         spin_unlock_bh(&se_tpg->session_lock);
4280
4281         kfree(sess);
4282         return 0;
4283 }
4284
4285 static void iscsit_logout_post_handler_closesession(
4286         struct iscsi_conn *conn)
4287 {
4288         struct iscsi_session *sess = conn->sess;
4289
4290         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4291         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4292
4293         atomic_set(&conn->conn_logout_remove, 0);
4294         complete(&conn->conn_logout_comp);
4295
4296         iscsit_dec_conn_usage_count(conn);
4297         iscsit_stop_session(sess, 1, 1);
4298         iscsit_dec_session_usage_count(sess);
4299         iscsit_close_session(sess);
4300 }
4301
4302 static void iscsit_logout_post_handler_samecid(
4303         struct iscsi_conn *conn)
4304 {
4305         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4306         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4307
4308         atomic_set(&conn->conn_logout_remove, 0);
4309         complete(&conn->conn_logout_comp);
4310
4311         iscsit_cause_connection_reinstatement(conn, 1);
4312         iscsit_dec_conn_usage_count(conn);
4313 }
4314
4315 static void iscsit_logout_post_handler_diffcid(
4316         struct iscsi_conn *conn,
4317         u16 cid)
4318 {
4319         struct iscsi_conn *l_conn;
4320         struct iscsi_session *sess = conn->sess;
4321
4322         if (!sess)
4323                 return;
4324
4325         spin_lock_bh(&sess->conn_lock);
4326         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4327                 if (l_conn->cid == cid) {
4328                         iscsit_inc_conn_usage_count(l_conn);
4329                         break;
4330                 }
4331         }
4332         spin_unlock_bh(&sess->conn_lock);
4333
4334         if (!l_conn)
4335                 return;
4336
4337         if (l_conn->sock)
4338                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4339
4340         spin_lock_bh(&l_conn->state_lock);
4341         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4342         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4343         spin_unlock_bh(&l_conn->state_lock);
4344
4345         iscsit_cause_connection_reinstatement(l_conn, 1);
4346         iscsit_dec_conn_usage_count(l_conn);
4347 }
4348
4349 /*
4350  *      Return of 0 causes the TX thread to restart.
4351  */
4352 static int iscsit_logout_post_handler(
4353         struct iscsi_cmd *cmd,
4354         struct iscsi_conn *conn)
4355 {
4356         int ret = 0;
4357
4358         switch (cmd->logout_reason) {
4359         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4360                 switch (cmd->logout_response) {
4361                 case ISCSI_LOGOUT_SUCCESS:
4362                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4363                 default:
4364                         iscsit_logout_post_handler_closesession(conn);
4365                         break;
4366                 }
4367                 ret = 0;
4368                 break;
4369         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4370                 if (conn->cid == cmd->logout_cid) {
4371                         switch (cmd->logout_response) {
4372                         case ISCSI_LOGOUT_SUCCESS:
4373                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4374                         default:
4375                                 iscsit_logout_post_handler_samecid(conn);
4376                                 break;
4377                         }
4378                         ret = 0;
4379                 } else {
4380                         switch (cmd->logout_response) {
4381                         case ISCSI_LOGOUT_SUCCESS:
4382                                 iscsit_logout_post_handler_diffcid(conn,
4383                                         cmd->logout_cid);
4384                                 break;
4385                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4386                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4387                         default:
4388                                 break;
4389                         }
4390                         ret = 1;
4391                 }
4392                 break;
4393         case ISCSI_LOGOUT_REASON_RECOVERY:
4394                 switch (cmd->logout_response) {
4395                 case ISCSI_LOGOUT_SUCCESS:
4396                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4397                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4398                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4399                 default:
4400                         break;
4401                 }
4402                 ret = 1;
4403                 break;
4404         default:
4405                 break;
4406
4407         }
4408         return ret;
4409 }
4410
4411 void iscsit_fail_session(struct iscsi_session *sess)
4412 {
4413         struct iscsi_conn *conn;
4414
4415         spin_lock_bh(&sess->conn_lock);
4416         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4417                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4418                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4419         }
4420         spin_unlock_bh(&sess->conn_lock);
4421
4422         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4423         sess->session_state = TARG_SESS_STATE_FAILED;
4424 }
4425
4426 int iscsit_free_session(struct iscsi_session *sess)
4427 {
4428         u16 conn_count = atomic_read(&sess->nconn);
4429         struct iscsi_conn *conn, *conn_tmp = NULL;
4430         int is_last;
4431
4432         spin_lock_bh(&sess->conn_lock);
4433         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4434
4435         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4436                         conn_list) {
4437                 if (conn_count == 0)
4438                         break;
4439
4440                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4441                         is_last = 1;
4442                 } else {
4443                         iscsit_inc_conn_usage_count(conn_tmp);
4444                         is_last = 0;
4445                 }
4446                 iscsit_inc_conn_usage_count(conn);
4447
4448                 spin_unlock_bh(&sess->conn_lock);
4449                 iscsit_cause_connection_reinstatement(conn, 1);
4450                 spin_lock_bh(&sess->conn_lock);
4451
4452                 iscsit_dec_conn_usage_count(conn);
4453                 if (is_last == 0)
4454                         iscsit_dec_conn_usage_count(conn_tmp);
4455
4456                 conn_count--;
4457         }
4458
4459         if (atomic_read(&sess->nconn)) {
4460                 spin_unlock_bh(&sess->conn_lock);
4461                 wait_for_completion(&sess->session_wait_comp);
4462         } else
4463                 spin_unlock_bh(&sess->conn_lock);
4464
4465         iscsit_close_session(sess);
4466         return 0;
4467 }
4468
4469 void iscsit_stop_session(
4470         struct iscsi_session *sess,
4471         int session_sleep,
4472         int connection_sleep)
4473 {
4474         u16 conn_count = atomic_read(&sess->nconn);
4475         struct iscsi_conn *conn, *conn_tmp = NULL;
4476         int is_last;
4477
4478         spin_lock_bh(&sess->conn_lock);
4479         if (session_sleep)
4480                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4481
4482         if (connection_sleep) {
4483                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4484                                 conn_list) {
4485                         if (conn_count == 0)
4486                                 break;
4487
4488                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4489                                 is_last = 1;
4490                         } else {
4491                                 iscsit_inc_conn_usage_count(conn_tmp);
4492                                 is_last = 0;
4493                         }
4494                         iscsit_inc_conn_usage_count(conn);
4495
4496                         spin_unlock_bh(&sess->conn_lock);
4497                         iscsit_cause_connection_reinstatement(conn, 1);
4498                         spin_lock_bh(&sess->conn_lock);
4499
4500                         iscsit_dec_conn_usage_count(conn);
4501                         if (is_last == 0)
4502                                 iscsit_dec_conn_usage_count(conn_tmp);
4503                         conn_count--;
4504                 }
4505         } else {
4506                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4507                         iscsit_cause_connection_reinstatement(conn, 0);
4508         }
4509
4510         if (session_sleep && atomic_read(&sess->nconn)) {
4511                 spin_unlock_bh(&sess->conn_lock);
4512                 wait_for_completion(&sess->session_wait_comp);
4513         } else
4514                 spin_unlock_bh(&sess->conn_lock);
4515 }
4516
4517 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4518 {
4519         struct iscsi_session *sess;
4520         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4521         struct se_session *se_sess, *se_sess_tmp;
4522         int session_count = 0;
4523
4524         spin_lock_bh(&se_tpg->session_lock);
4525         if (tpg->nsessions && !force) {
4526                 spin_unlock_bh(&se_tpg->session_lock);
4527                 return -1;
4528         }
4529
4530         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4531                         sess_list) {
4532                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4533
4534                 spin_lock(&sess->conn_lock);
4535                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4536                     atomic_read(&sess->session_logout) ||
4537                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4538                         spin_unlock(&sess->conn_lock);
4539                         continue;
4540                 }
4541                 atomic_set(&sess->session_reinstatement, 1);
4542                 spin_unlock(&sess->conn_lock);
4543                 spin_unlock_bh(&se_tpg->session_lock);
4544
4545                 iscsit_free_session(sess);
4546                 spin_lock_bh(&se_tpg->session_lock);
4547
4548                 session_count++;
4549         }
4550         spin_unlock_bh(&se_tpg->session_lock);
4551
4552         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4553                         " Group: %hu\n", session_count, tpg->tpgt);
4554         return 0;
4555 }
4556
4557 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4558 MODULE_VERSION("4.1.x");
4559 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4560 MODULE_LICENSE("GPL");
4561
4562 module_init(iscsi_target_init_module);
4563 module_exit(iscsi_target_cleanup_module);