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                 return 0;
2247         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2248                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2249                         hdr->begrun, hdr->runlength);
2250         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2251                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2252                         hdr->runlength);
2253         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2254                 /* FIXME: Support R-Data SNACK */
2255                 pr_err("R-Data SNACK Not Supported.\n");
2256                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2257                                         buf, conn);
2258         default:
2259                 pr_err("Unknown SNACK type 0x%02x, protocol"
2260                         " error.\n", hdr->flags & 0x0f);
2261                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2262                                         buf, conn);
2263         }
2264
2265         return 0;
2266 }
2267
2268 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2269 {
2270         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2271             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2272                 wait_for_completion_interruptible_timeout(
2273                                         &conn->rx_half_close_comp,
2274                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2275         }
2276 }
2277
2278 static int iscsit_handle_immediate_data(
2279         struct iscsi_cmd *cmd,
2280         unsigned char *buf,
2281         u32 length)
2282 {
2283         int iov_ret, rx_got = 0, rx_size = 0;
2284         u32 checksum, iov_count = 0, padding = 0;
2285         struct iscsi_conn *conn = cmd->conn;
2286         struct kvec *iov;
2287
2288         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2289         if (iov_ret < 0)
2290                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2291
2292         rx_size = length;
2293         iov_count = iov_ret;
2294         iov = &cmd->iov_data[0];
2295
2296         padding = ((-length) & 3);
2297         if (padding != 0) {
2298                 iov[iov_count].iov_base = cmd->pad_bytes;
2299                 iov[iov_count++].iov_len = padding;
2300                 rx_size += padding;
2301         }
2302
2303         if (conn->conn_ops->DataDigest) {
2304                 iov[iov_count].iov_base         = &checksum;
2305                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2306                 rx_size += ISCSI_CRC_LEN;
2307         }
2308
2309         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2310
2311         iscsit_unmap_iovec(cmd);
2312
2313         if (rx_got != rx_size) {
2314                 iscsit_rx_thread_wait_for_tcp(conn);
2315                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2316         }
2317
2318         if (conn->conn_ops->DataDigest) {
2319                 u32 data_crc;
2320
2321                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2322                                                     cmd->write_data_done, length, padding,
2323                                                     cmd->pad_bytes);
2324
2325                 if (checksum != data_crc) {
2326                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2327                                 " does not match computed 0x%08x\n", checksum,
2328                                 data_crc);
2329
2330                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2331                                 pr_err("Unable to recover from"
2332                                         " Immediate Data digest failure while"
2333                                         " in ERL=0.\n");
2334                                 iscsit_add_reject_from_cmd(
2335                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2336                                                 1, 0, buf, cmd);
2337                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2338                         } else {
2339                                 iscsit_add_reject_from_cmd(
2340                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2341                                                 0, 0, buf, cmd);
2342                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2343                         }
2344                 } else {
2345                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2346                                 " %u bytes of Immediate Data\n", checksum,
2347                                 length);
2348                 }
2349         }
2350
2351         cmd->write_data_done += length;
2352
2353         if (cmd->write_data_done == cmd->data_length) {
2354                 spin_lock_bh(&cmd->istate_lock);
2355                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2356                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2357                 spin_unlock_bh(&cmd->istate_lock);
2358         }
2359
2360         return IMMEDIATE_DATA_NORMAL_OPERATION;
2361 }
2362
2363 /*
2364  *      Called with sess->conn_lock held.
2365  */
2366 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2367         with active network interface */
2368 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2369 {
2370         struct iscsi_cmd *cmd;
2371         struct iscsi_conn *conn_p;
2372
2373         /*
2374          * Only send a Asynchronous Message on connections whos network
2375          * interface is still functional.
2376          */
2377         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2378                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2379                         iscsit_inc_conn_usage_count(conn_p);
2380                         break;
2381                 }
2382         }
2383
2384         if (!conn_p)
2385                 return;
2386
2387         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2388         if (!cmd) {
2389                 iscsit_dec_conn_usage_count(conn_p);
2390                 return;
2391         }
2392
2393         cmd->logout_cid = conn->cid;
2394         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2395         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2396
2397         spin_lock_bh(&conn_p->cmd_lock);
2398         list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2399         spin_unlock_bh(&conn_p->cmd_lock);
2400
2401         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2402         iscsit_dec_conn_usage_count(conn_p);
2403 }
2404
2405 static int iscsit_send_conn_drop_async_message(
2406         struct iscsi_cmd *cmd,
2407         struct iscsi_conn *conn)
2408 {
2409         struct iscsi_async *hdr;
2410
2411         cmd->tx_size = ISCSI_HDR_LEN;
2412         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2413
2414         hdr                     = (struct iscsi_async *) cmd->pdu;
2415         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2416         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2417         cmd->init_task_tag      = 0xFFFFFFFF;
2418         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2419         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2420         cmd->stat_sn            = conn->stat_sn++;
2421         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2422         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2423         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2424         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2425         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2426         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2427         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2428
2429         if (conn->conn_ops->HeaderDigest) {
2430                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2431
2432                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2433                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2434                                 0, NULL, (u8 *)header_digest);
2435
2436                 cmd->tx_size += ISCSI_CRC_LEN;
2437                 pr_debug("Attaching CRC32C HeaderDigest to"
2438                         " Async Message 0x%08x\n", *header_digest);
2439         }
2440
2441         cmd->iov_misc[0].iov_base       = cmd->pdu;
2442         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2443         cmd->iov_misc_count             = 1;
2444
2445         pr_debug("Sending Connection Dropped Async Message StatSN:"
2446                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2447                         cmd->logout_cid, conn->cid);
2448         return 0;
2449 }
2450
2451 static int iscsit_send_data_in(
2452         struct iscsi_cmd *cmd,
2453         struct iscsi_conn *conn,
2454         int *eodr)
2455 {
2456         int iov_ret = 0, set_statsn = 0;
2457         u32 iov_count = 0, tx_size = 0;
2458         struct iscsi_datain datain;
2459         struct iscsi_datain_req *dr;
2460         struct iscsi_data_rsp *hdr;
2461         struct kvec *iov;
2462
2463         memset(&datain, 0, sizeof(struct iscsi_datain));
2464         dr = iscsit_get_datain_values(cmd, &datain);
2465         if (!dr) {
2466                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2467                                 cmd->init_task_tag);
2468                 return -1;
2469         }
2470
2471         /*
2472          * Be paranoid and double check the logic for now.
2473          */
2474         if ((datain.offset + datain.length) > cmd->data_length) {
2475                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2476                         " datain.length: %u exceeds cmd->data_length: %u\n",
2477                         cmd->init_task_tag, datain.offset, datain.length,
2478                                 cmd->data_length);
2479                 return -1;
2480         }
2481
2482         spin_lock_bh(&conn->sess->session_stats_lock);
2483         conn->sess->tx_data_octets += datain.length;
2484         if (conn->sess->se_sess->se_node_acl) {
2485                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2486                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2487                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2488         }
2489         spin_unlock_bh(&conn->sess->session_stats_lock);
2490         /*
2491          * Special case for successfully execution w/ both DATAIN
2492          * and Sense Data.
2493          */
2494         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2495             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2496                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2497         else {
2498                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2499                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2500                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2501                         cmd->stat_sn = conn->stat_sn++;
2502                         set_statsn = 1;
2503                 } else if (dr->dr_complete ==
2504                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2505                         set_statsn = 1;
2506         }
2507
2508         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2509         memset(hdr, 0, ISCSI_HDR_LEN);
2510         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2511         hdr->flags              = datain.flags;
2512         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2513                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2514                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2515                         hdr->residual_count = cpu_to_be32(cmd->residual_count);
2516                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2517                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2518                         hdr->residual_count = cpu_to_be32(cmd->residual_count);
2519                 }
2520         }
2521         hton24(hdr->dlength, datain.length);
2522         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2523                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2524                                 (struct scsi_lun *)&hdr->lun);
2525         else
2526                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2527
2528         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2529         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2530                                    cpu_to_be32(cmd->targ_xfer_tag) :
2531                                    0xFFFFFFFF;
2532         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2533                                                 0xFFFFFFFF;
2534         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2535         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2536         hdr->datasn             = cpu_to_be32(datain.data_sn);
2537         hdr->offset             = cpu_to_be32(datain.offset);
2538
2539         iov = &cmd->iov_data[0];
2540         iov[iov_count].iov_base = cmd->pdu;
2541         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2542         tx_size += ISCSI_HDR_LEN;
2543
2544         if (conn->conn_ops->HeaderDigest) {
2545                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2546
2547                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2548                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2549                                 0, NULL, (u8 *)header_digest);
2550
2551                 iov[0].iov_len += ISCSI_CRC_LEN;
2552                 tx_size += ISCSI_CRC_LEN;
2553
2554                 pr_debug("Attaching CRC32 HeaderDigest"
2555                         " for DataIN PDU 0x%08x\n", *header_digest);
2556         }
2557
2558         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2559         if (iov_ret < 0)
2560                 return -1;
2561
2562         iov_count += iov_ret;
2563         tx_size += datain.length;
2564
2565         cmd->padding = ((-datain.length) & 3);
2566         if (cmd->padding) {
2567                 iov[iov_count].iov_base         = cmd->pad_bytes;
2568                 iov[iov_count++].iov_len        = cmd->padding;
2569                 tx_size += cmd->padding;
2570
2571                 pr_debug("Attaching %u padding bytes\n",
2572                                 cmd->padding);
2573         }
2574         if (conn->conn_ops->DataDigest) {
2575                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2576                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2577
2578                 iov[iov_count].iov_base = &cmd->data_crc;
2579                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2580                 tx_size += ISCSI_CRC_LEN;
2581
2582                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2583                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2584         }
2585
2586         cmd->iov_data_count = iov_count;
2587         cmd->tx_size = tx_size;
2588
2589         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2590                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2591                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2592                 ntohl(hdr->offset), datain.length, conn->cid);
2593
2594         if (dr->dr_complete) {
2595                 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2596                                 2 : 1;
2597                 iscsit_free_datain_req(cmd, dr);
2598         }
2599
2600         return 0;
2601 }
2602
2603 static int iscsit_send_logout_response(
2604         struct iscsi_cmd *cmd,
2605         struct iscsi_conn *conn)
2606 {
2607         int niov = 0, tx_size;
2608         struct iscsi_conn *logout_conn = NULL;
2609         struct iscsi_conn_recovery *cr = NULL;
2610         struct iscsi_session *sess = conn->sess;
2611         struct kvec *iov;
2612         struct iscsi_logout_rsp *hdr;
2613         /*
2614          * The actual shutting down of Sessions and/or Connections
2615          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2616          * is done in scsi_logout_post_handler().
2617          */
2618         switch (cmd->logout_reason) {
2619         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2620                 pr_debug("iSCSI session logout successful, setting"
2621                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2622                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2623                 break;
2624         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2625                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2626                         break;
2627                 /*
2628                  * For CLOSECONNECTION logout requests carrying
2629                  * a matching logout CID -> local CID, the reference
2630                  * for the local CID will have been incremented in
2631                  * iscsi_logout_closeconnection().
2632                  *
2633                  * For CLOSECONNECTION logout requests carrying
2634                  * a different CID than the connection it arrived
2635                  * on, the connection responding to cmd->logout_cid
2636                  * is stopped in iscsit_logout_post_handler_diffcid().
2637                  */
2638
2639                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2640                         " successful.\n", cmd->logout_cid, conn->cid);
2641                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2642                 break;
2643         case ISCSI_LOGOUT_REASON_RECOVERY:
2644                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2645                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2646                         break;
2647                 /*
2648                  * If the connection is still active from our point of view
2649                  * force connection recovery to occur.
2650                  */
2651                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2652                                 cmd->logout_cid);
2653                 if ((logout_conn)) {
2654                         iscsit_connection_reinstatement_rcfr(logout_conn);
2655                         iscsit_dec_conn_usage_count(logout_conn);
2656                 }
2657
2658                 cr = iscsit_get_inactive_connection_recovery_entry(
2659                                 conn->sess, cmd->logout_cid);
2660                 if (!cr) {
2661                         pr_err("Unable to locate CID: %hu for"
2662                         " REMOVECONNFORRECOVERY Logout Request.\n",
2663                                 cmd->logout_cid);
2664                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2665                         break;
2666                 }
2667
2668                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2669
2670                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2671                         " for recovery for CID: %hu on CID: %hu successful.\n",
2672                                 cmd->logout_cid, conn->cid);
2673                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2674                 break;
2675         default:
2676                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2677                                 cmd->logout_reason);
2678                 return -1;
2679         }
2680
2681         tx_size = ISCSI_HDR_LEN;
2682         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2683         memset(hdr, 0, ISCSI_HDR_LEN);
2684         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2685         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2686         hdr->response           = cmd->logout_response;
2687         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2688         cmd->stat_sn            = conn->stat_sn++;
2689         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2690
2691         iscsit_increment_maxcmdsn(cmd, conn->sess);
2692         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2693         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2694
2695         iov = &cmd->iov_misc[0];
2696         iov[niov].iov_base      = cmd->pdu;
2697         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2698
2699         if (conn->conn_ops->HeaderDigest) {
2700                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2701
2702                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2703                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2704                                 0, NULL, (u8 *)header_digest);
2705
2706                 iov[0].iov_len += ISCSI_CRC_LEN;
2707                 tx_size += ISCSI_CRC_LEN;
2708                 pr_debug("Attaching CRC32C HeaderDigest to"
2709                         " Logout Response 0x%08x\n", *header_digest);
2710         }
2711         cmd->iov_misc_count = niov;
2712         cmd->tx_size = tx_size;
2713
2714         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2715                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2716                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2717                 cmd->logout_cid, conn->cid);
2718
2719         return 0;
2720 }
2721
2722 /*
2723  *      Unsolicited NOPIN, either requesting a response or not.
2724  */
2725 static int iscsit_send_unsolicited_nopin(
2726         struct iscsi_cmd *cmd,
2727         struct iscsi_conn *conn,
2728         int want_response)
2729 {
2730         int tx_size = ISCSI_HDR_LEN;
2731         struct iscsi_nopin *hdr;
2732
2733         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2734         memset(hdr, 0, ISCSI_HDR_LEN);
2735         hdr->opcode             = ISCSI_OP_NOOP_IN;
2736         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2737         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2738         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2739         cmd->stat_sn            = conn->stat_sn;
2740         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2741         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2742         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2743
2744         if (conn->conn_ops->HeaderDigest) {
2745                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2746
2747                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2748                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2749                                 0, NULL, (u8 *)header_digest);
2750
2751                 tx_size += ISCSI_CRC_LEN;
2752                 pr_debug("Attaching CRC32C HeaderDigest to"
2753                         " NopIN 0x%08x\n", *header_digest);
2754         }
2755
2756         cmd->iov_misc[0].iov_base       = cmd->pdu;
2757         cmd->iov_misc[0].iov_len        = tx_size;
2758         cmd->iov_misc_count     = 1;
2759         cmd->tx_size            = tx_size;
2760
2761         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2762                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2763
2764         return 0;
2765 }
2766
2767 static int iscsit_send_nopin_response(
2768         struct iscsi_cmd *cmd,
2769         struct iscsi_conn *conn)
2770 {
2771         int niov = 0, tx_size;
2772         u32 padding = 0;
2773         struct kvec *iov;
2774         struct iscsi_nopin *hdr;
2775
2776         tx_size = ISCSI_HDR_LEN;
2777         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2778         memset(hdr, 0, ISCSI_HDR_LEN);
2779         hdr->opcode             = ISCSI_OP_NOOP_IN;
2780         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2781         hton24(hdr->dlength, cmd->buf_ptr_size);
2782         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2783         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2784         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2785         cmd->stat_sn            = conn->stat_sn++;
2786         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2787
2788         iscsit_increment_maxcmdsn(cmd, conn->sess);
2789         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2790         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2791
2792         iov = &cmd->iov_misc[0];
2793         iov[niov].iov_base      = cmd->pdu;
2794         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2795
2796         if (conn->conn_ops->HeaderDigest) {
2797                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2798
2799                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2800                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2801                                 0, NULL, (u8 *)header_digest);
2802
2803                 iov[0].iov_len += ISCSI_CRC_LEN;
2804                 tx_size += ISCSI_CRC_LEN;
2805                 pr_debug("Attaching CRC32C HeaderDigest"
2806                         " to NopIn 0x%08x\n", *header_digest);
2807         }
2808
2809         /*
2810          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2811          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2812          */
2813         if (cmd->buf_ptr_size) {
2814                 iov[niov].iov_base      = cmd->buf_ptr;
2815                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2816                 tx_size += cmd->buf_ptr_size;
2817
2818                 pr_debug("Echoing back %u bytes of ping"
2819                         " data.\n", cmd->buf_ptr_size);
2820
2821                 padding = ((-cmd->buf_ptr_size) & 3);
2822                 if (padding != 0) {
2823                         iov[niov].iov_base = &cmd->pad_bytes;
2824                         iov[niov++].iov_len = padding;
2825                         tx_size += padding;
2826                         pr_debug("Attaching %u additional"
2827                                 " padding bytes.\n", padding);
2828                 }
2829                 if (conn->conn_ops->DataDigest) {
2830                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2831                                 cmd->buf_ptr, cmd->buf_ptr_size,
2832                                 padding, (u8 *)&cmd->pad_bytes,
2833                                 (u8 *)&cmd->data_crc);
2834
2835                         iov[niov].iov_base = &cmd->data_crc;
2836                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2837                         tx_size += ISCSI_CRC_LEN;
2838                         pr_debug("Attached DataDigest for %u"
2839                                 " bytes of ping data, CRC 0x%08x\n",
2840                                 cmd->buf_ptr_size, cmd->data_crc);
2841                 }
2842         }
2843
2844         cmd->iov_misc_count = niov;
2845         cmd->tx_size = tx_size;
2846
2847         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2848                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2849                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2850
2851         return 0;
2852 }
2853
2854 int iscsit_send_r2t(
2855         struct iscsi_cmd *cmd,
2856         struct iscsi_conn *conn)
2857 {
2858         int tx_size = 0;
2859         struct iscsi_r2t *r2t;
2860         struct iscsi_r2t_rsp *hdr;
2861
2862         r2t = iscsit_get_r2t_from_list(cmd);
2863         if (!r2t)
2864                 return -1;
2865
2866         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2867         memset(hdr, 0, ISCSI_HDR_LEN);
2868         hdr->opcode             = ISCSI_OP_R2T;
2869         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2870         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2871                         (struct scsi_lun *)&hdr->lun);
2872         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2873         spin_lock_bh(&conn->sess->ttt_lock);
2874         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2875         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2876                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2877         spin_unlock_bh(&conn->sess->ttt_lock);
2878         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2879         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2880         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2881         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2882         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2883         hdr->data_offset        = cpu_to_be32(r2t->offset);
2884         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2885
2886         cmd->iov_misc[0].iov_base       = cmd->pdu;
2887         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2888         tx_size += ISCSI_HDR_LEN;
2889
2890         if (conn->conn_ops->HeaderDigest) {
2891                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2892
2893                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2894                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2895                                 0, NULL, (u8 *)header_digest);
2896
2897                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2898                 tx_size += ISCSI_CRC_LEN;
2899                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2900                         " PDU 0x%08x\n", *header_digest);
2901         }
2902
2903         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2904                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2905                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2906                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2907                         r2t->offset, r2t->xfer_len, conn->cid);
2908
2909         cmd->iov_misc_count = 1;
2910         cmd->tx_size = tx_size;
2911
2912         spin_lock_bh(&cmd->r2t_lock);
2913         r2t->sent_r2t = 1;
2914         spin_unlock_bh(&cmd->r2t_lock);
2915
2916         return 0;
2917 }
2918
2919 /*
2920  *      type 0: Normal Operation.
2921  *      type 1: Called from Storage Transport.
2922  *      type 2: Called from iscsi_task_reassign_complete_write() for
2923  *              connection recovery.
2924  */
2925 int iscsit_build_r2ts_for_cmd(
2926         struct iscsi_cmd *cmd,
2927         struct iscsi_conn *conn,
2928         int type)
2929 {
2930         int first_r2t = 1;
2931         u32 offset = 0, xfer_len = 0;
2932
2933         spin_lock_bh(&cmd->r2t_lock);
2934         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2935                 spin_unlock_bh(&cmd->r2t_lock);
2936                 return 0;
2937         }
2938
2939         if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2940                 if (cmd->r2t_offset < cmd->write_data_done)
2941                         cmd->r2t_offset = cmd->write_data_done;
2942
2943         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2944                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2945                         offset = cmd->r2t_offset;
2946
2947                         if (first_r2t && (type == 2)) {
2948                                 xfer_len = ((offset +
2949                                              (conn->sess->sess_ops->MaxBurstLength -
2950                                              cmd->next_burst_len) >
2951                                              cmd->data_length) ?
2952                                             (cmd->data_length - offset) :
2953                                             (conn->sess->sess_ops->MaxBurstLength -
2954                                              cmd->next_burst_len));
2955                         } else {
2956                                 xfer_len = ((offset +
2957                                              conn->sess->sess_ops->MaxBurstLength) >
2958                                              cmd->data_length) ?
2959                                              (cmd->data_length - offset) :
2960                                              conn->sess->sess_ops->MaxBurstLength;
2961                         }
2962                         cmd->r2t_offset += xfer_len;
2963
2964                         if (cmd->r2t_offset == cmd->data_length)
2965                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2966                 } else {
2967                         struct iscsi_seq *seq;
2968
2969                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2970                         if (!seq) {
2971                                 spin_unlock_bh(&cmd->r2t_lock);
2972                                 return -1;
2973                         }
2974
2975                         offset = seq->offset;
2976                         xfer_len = seq->xfer_len;
2977
2978                         if (cmd->seq_send_order == cmd->seq_count)
2979                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2980                 }
2981                 cmd->outstanding_r2ts++;
2982                 first_r2t = 0;
2983
2984                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2985                         spin_unlock_bh(&cmd->r2t_lock);
2986                         return -1;
2987                 }
2988
2989                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2990                         break;
2991         }
2992         spin_unlock_bh(&cmd->r2t_lock);
2993
2994         return 0;
2995 }
2996
2997 static int iscsit_send_status(
2998         struct iscsi_cmd *cmd,
2999         struct iscsi_conn *conn)
3000 {
3001         u8 iov_count = 0, recovery;
3002         u32 padding = 0, tx_size = 0;
3003         struct iscsi_scsi_rsp *hdr;
3004         struct kvec *iov;
3005
3006         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3007         if (!recovery)
3008                 cmd->stat_sn = conn->stat_sn++;
3009
3010         spin_lock_bh(&conn->sess->session_stats_lock);
3011         conn->sess->rsp_pdus++;
3012         spin_unlock_bh(&conn->sess->session_stats_lock);
3013
3014         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3015         memset(hdr, 0, ISCSI_HDR_LEN);
3016         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3017         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3018         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3019                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3020                 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3021         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3022                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3023                 hdr->residual_count = cpu_to_be32(cmd->residual_count);
3024         }
3025         hdr->response           = cmd->iscsi_response;
3026         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3027         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3028         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3029
3030         iscsit_increment_maxcmdsn(cmd, conn->sess);
3031         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3032         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3033
3034         iov = &cmd->iov_misc[0];
3035         iov[iov_count].iov_base = cmd->pdu;
3036         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3037         tx_size += ISCSI_HDR_LEN;
3038
3039         /*
3040          * Attach SENSE DATA payload to iSCSI Response PDU
3041          */
3042         if (cmd->se_cmd.sense_buffer &&
3043            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3044             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3045                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3046                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3047                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3048                 iov[iov_count++].iov_len =
3049                                 (cmd->se_cmd.scsi_sense_length + padding);
3050                 tx_size += cmd->se_cmd.scsi_sense_length;
3051
3052                 if (padding) {
3053                         memset(cmd->se_cmd.sense_buffer +
3054                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3055                         tx_size += padding;
3056                         pr_debug("Adding %u bytes of padding to"
3057                                 " SENSE.\n", padding);
3058                 }
3059
3060                 if (conn->conn_ops->DataDigest) {
3061                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3062                                 cmd->se_cmd.sense_buffer,
3063                                 (cmd->se_cmd.scsi_sense_length + padding),
3064                                 0, NULL, (u8 *)&cmd->data_crc);
3065
3066                         iov[iov_count].iov_base    = &cmd->data_crc;
3067                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3068                         tx_size += ISCSI_CRC_LEN;
3069
3070                         pr_debug("Attaching CRC32 DataDigest for"
3071                                 " SENSE, %u bytes CRC 0x%08x\n",
3072                                 (cmd->se_cmd.scsi_sense_length + padding),
3073                                 cmd->data_crc);
3074                 }
3075
3076                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3077                                 " Response PDU\n",
3078                                 cmd->se_cmd.scsi_sense_length);
3079         }
3080
3081         if (conn->conn_ops->HeaderDigest) {
3082                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3083
3084                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3085                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3086                                 0, NULL, (u8 *)header_digest);
3087
3088                 iov[0].iov_len += ISCSI_CRC_LEN;
3089                 tx_size += ISCSI_CRC_LEN;
3090                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3091                                 " PDU 0x%08x\n", *header_digest);
3092         }
3093
3094         cmd->iov_misc_count = iov_count;
3095         cmd->tx_size = tx_size;
3096
3097         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3098                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3099                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3100                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3101
3102         return 0;
3103 }
3104
3105 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3106 {
3107         switch (se_tmr->response) {
3108         case TMR_FUNCTION_COMPLETE:
3109                 return ISCSI_TMF_RSP_COMPLETE;
3110         case TMR_TASK_DOES_NOT_EXIST:
3111                 return ISCSI_TMF_RSP_NO_TASK;
3112         case TMR_LUN_DOES_NOT_EXIST:
3113                 return ISCSI_TMF_RSP_NO_LUN;
3114         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3115                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3116         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3117                 return ISCSI_TMF_RSP_AUTH_FAILED;
3118         case TMR_FUNCTION_REJECTED:
3119         default:
3120                 return ISCSI_TMF_RSP_REJECTED;
3121         }
3122 }
3123
3124 static int iscsit_send_task_mgt_rsp(
3125         struct iscsi_cmd *cmd,
3126         struct iscsi_conn *conn)
3127 {
3128         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3129         struct iscsi_tm_rsp *hdr;
3130         u32 tx_size = 0;
3131
3132         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3133         memset(hdr, 0, ISCSI_HDR_LEN);
3134         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3135         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3136         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3137         cmd->stat_sn            = conn->stat_sn++;
3138         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3139
3140         iscsit_increment_maxcmdsn(cmd, conn->sess);
3141         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3142         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3143
3144         cmd->iov_misc[0].iov_base       = cmd->pdu;
3145         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3146         tx_size += ISCSI_HDR_LEN;
3147
3148         if (conn->conn_ops->HeaderDigest) {
3149                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3150
3151                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3152                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3153                                 0, NULL, (u8 *)header_digest);
3154
3155                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3156                 tx_size += ISCSI_CRC_LEN;
3157                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3158                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3159         }
3160
3161         cmd->iov_misc_count = 1;
3162         cmd->tx_size = tx_size;
3163
3164         pr_debug("Built Task Management Response ITT: 0x%08x,"
3165                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3166                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3167
3168         return 0;
3169 }
3170
3171 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3172 {
3173         char *payload = NULL;
3174         struct iscsi_conn *conn = cmd->conn;
3175         struct iscsi_portal_group *tpg;
3176         struct iscsi_tiqn *tiqn;
3177         struct iscsi_tpg_np *tpg_np;
3178         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3179         unsigned char buf[256];
3180
3181         buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3182                         32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3183
3184         memset(buf, 0, 256);
3185
3186         payload = kzalloc(buffer_len, GFP_KERNEL);
3187         if (!payload) {
3188                 pr_err("Unable to allocate memory for sendtargets"
3189                                 " response.\n");
3190                 return -ENOMEM;
3191         }
3192
3193         spin_lock(&tiqn_lock);
3194         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3195                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3196                 len += 1;
3197
3198                 if ((len + payload_len) > buffer_len) {
3199                         spin_unlock(&tiqn->tiqn_tpg_lock);
3200                         end_of_buf = 1;
3201                         goto eob;
3202                 }
3203                 memcpy((void *)payload + payload_len, buf, len);
3204                 payload_len += len;
3205
3206                 spin_lock(&tiqn->tiqn_tpg_lock);
3207                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3208
3209                         spin_lock(&tpg->tpg_state_lock);
3210                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3211                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3212                                 spin_unlock(&tpg->tpg_state_lock);
3213                                 continue;
3214                         }
3215                         spin_unlock(&tpg->tpg_state_lock);
3216
3217                         spin_lock(&tpg->tpg_np_lock);
3218                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3219                                                 tpg_np_list) {
3220                                 len = sprintf(buf, "TargetAddress="
3221                                         "%s%s%s:%hu,%hu",
3222                                         (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3223                                         "[" : "", tpg_np->tpg_np->np_ip,
3224                                         (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ?
3225                                         "]" : "", tpg_np->tpg_np->np_port,
3226                                         tpg->tpgt);
3227                                 len += 1;
3228
3229                                 if ((len + payload_len) > buffer_len) {
3230                                         spin_unlock(&tpg->tpg_np_lock);
3231                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3232                                         end_of_buf = 1;
3233                                         goto eob;
3234                                 }
3235                                 memcpy((void *)payload + payload_len, buf, len);
3236                                 payload_len += len;
3237                         }
3238                         spin_unlock(&tpg->tpg_np_lock);
3239                 }
3240                 spin_unlock(&tiqn->tiqn_tpg_lock);
3241 eob:
3242                 if (end_of_buf)
3243                         break;
3244         }
3245         spin_unlock(&tiqn_lock);
3246
3247         cmd->buf_ptr = payload;
3248
3249         return payload_len;
3250 }
3251
3252 /*
3253  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3254  *      MaxRecvDataSegmentLength.
3255  */
3256 static int iscsit_send_text_rsp(
3257         struct iscsi_cmd *cmd,
3258         struct iscsi_conn *conn)
3259 {
3260         struct iscsi_text_rsp *hdr;
3261         struct kvec *iov;
3262         u32 padding = 0, tx_size = 0;
3263         int text_length, iov_count = 0;
3264
3265         text_length = iscsit_build_sendtargets_response(cmd);
3266         if (text_length < 0)
3267                 return text_length;
3268
3269         padding = ((-text_length) & 3);
3270         if (padding != 0) {
3271                 memset(cmd->buf_ptr + text_length, 0, padding);
3272                 pr_debug("Attaching %u additional bytes for"
3273                         " padding.\n", padding);
3274         }
3275
3276         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3277         memset(hdr, 0, ISCSI_HDR_LEN);
3278         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3279         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3280         hton24(hdr->dlength, text_length);
3281         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3282         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3283         cmd->stat_sn            = conn->stat_sn++;
3284         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3285
3286         iscsit_increment_maxcmdsn(cmd, conn->sess);
3287         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3288         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3289
3290         iov = &cmd->iov_misc[0];
3291
3292         iov[iov_count].iov_base = cmd->pdu;
3293         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3294         iov[iov_count].iov_base = cmd->buf_ptr;
3295         iov[iov_count++].iov_len = text_length + padding;
3296
3297         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3298
3299         if (conn->conn_ops->HeaderDigest) {
3300                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3301
3302                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3303                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3304                                 0, NULL, (u8 *)header_digest);
3305
3306                 iov[0].iov_len += ISCSI_CRC_LEN;
3307                 tx_size += ISCSI_CRC_LEN;
3308                 pr_debug("Attaching CRC32 HeaderDigest for"
3309                         " Text Response PDU 0x%08x\n", *header_digest);
3310         }
3311
3312         if (conn->conn_ops->DataDigest) {
3313                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3314                                 cmd->buf_ptr, (text_length + padding),
3315                                 0, NULL, (u8 *)&cmd->data_crc);
3316
3317                 iov[iov_count].iov_base = &cmd->data_crc;
3318                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3319                 tx_size += ISCSI_CRC_LEN;
3320
3321                 pr_debug("Attaching DataDigest for %u bytes of text"
3322                         " data, CRC 0x%08x\n", (text_length + padding),
3323                         cmd->data_crc);
3324         }
3325
3326         cmd->iov_misc_count = iov_count;
3327         cmd->tx_size = tx_size;
3328
3329         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3330                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3331                         text_length, conn->cid);
3332         return 0;
3333 }
3334
3335 static int iscsit_send_reject(
3336         struct iscsi_cmd *cmd,
3337         struct iscsi_conn *conn)
3338 {
3339         u32 iov_count = 0, tx_size = 0;
3340         struct iscsi_reject *hdr;
3341         struct kvec *iov;
3342
3343         hdr                     = (struct iscsi_reject *) cmd->pdu;
3344         hdr->opcode             = ISCSI_OP_REJECT;
3345         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3346         hton24(hdr->dlength, ISCSI_HDR_LEN);
3347         cmd->stat_sn            = conn->stat_sn++;
3348         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3349         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3350         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3351
3352         iov = &cmd->iov_misc[0];
3353
3354         iov[iov_count].iov_base = cmd->pdu;
3355         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3356         iov[iov_count].iov_base = cmd->buf_ptr;
3357         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3358
3359         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3360
3361         if (conn->conn_ops->HeaderDigest) {
3362                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3363
3364                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3365                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3366                                 0, NULL, (u8 *)header_digest);
3367
3368                 iov[0].iov_len += ISCSI_CRC_LEN;
3369                 tx_size += ISCSI_CRC_LEN;
3370                 pr_debug("Attaching CRC32 HeaderDigest for"
3371                         " REJECT PDU 0x%08x\n", *header_digest);
3372         }
3373
3374         if (conn->conn_ops->DataDigest) {
3375                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3376                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3377                                 0, NULL, (u8 *)&cmd->data_crc);
3378
3379                 iov[iov_count].iov_base = &cmd->data_crc;
3380                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3381                 tx_size += ISCSI_CRC_LEN;
3382                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3383                                 " PDU 0x%08x\n", cmd->data_crc);
3384         }
3385
3386         cmd->iov_misc_count = iov_count;
3387         cmd->tx_size = tx_size;
3388
3389         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3390                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3391
3392         return 0;
3393 }
3394
3395 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3396 {
3397         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3398             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3399                 wait_for_completion_interruptible_timeout(
3400                                         &conn->tx_half_close_comp,
3401                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3402         }
3403 }
3404
3405 #ifdef CONFIG_SMP
3406
3407 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3408 {
3409         struct iscsi_thread_set *ts = conn->thread_set;
3410         int ord, cpu;
3411         /*
3412          * thread_id is assigned from iscsit_global->ts_bitmap from
3413          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3414          *
3415          * Here we use thread_id to determine which CPU that this
3416          * iSCSI connection's iscsi_thread_set will be scheduled to
3417          * execute upon.
3418          */
3419         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3420 #if 0
3421         pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3422                         " thread_id: %d\n", ord, ts->thread_id);
3423 #endif
3424         for_each_online_cpu(cpu) {
3425                 if (ord-- == 0) {
3426                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3427                         return;
3428                 }
3429         }
3430         /*
3431          * This should never be reached..
3432          */
3433         dump_stack();
3434         cpumask_setall(conn->conn_cpumask);
3435 }
3436
3437 static inline void iscsit_thread_check_cpumask(
3438         struct iscsi_conn *conn,
3439         struct task_struct *p,
3440         int mode)
3441 {
3442         char buf[128];
3443         /*
3444          * mode == 1 signals iscsi_target_tx_thread() usage.
3445          * mode == 0 signals iscsi_target_rx_thread() usage.
3446          */
3447         if (mode == 1) {
3448                 if (!conn->conn_tx_reset_cpumask)
3449                         return;
3450                 conn->conn_tx_reset_cpumask = 0;
3451         } else {
3452                 if (!conn->conn_rx_reset_cpumask)
3453                         return;
3454                 conn->conn_rx_reset_cpumask = 0;
3455         }
3456         /*
3457          * Update the CPU mask for this single kthread so that
3458          * both TX and RX kthreads are scheduled to run on the
3459          * same CPU.
3460          */
3461         memset(buf, 0, 128);
3462         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3463 #if 0
3464         pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3465                         " %s for %s\n", buf, p->comm);
3466 #endif
3467         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3468 }
3469
3470 #else
3471
3472 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3473 {
3474         return;
3475 }
3476
3477 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3478 #endif /* CONFIG_SMP */
3479
3480 int iscsi_target_tx_thread(void *arg)
3481 {
3482         u8 state;
3483         int eodr = 0;
3484         int ret = 0;
3485         int sent_status = 0;
3486         int use_misc = 0;
3487         int map_sg = 0;
3488         struct iscsi_cmd *cmd = NULL;
3489         struct iscsi_conn *conn;
3490         struct iscsi_queue_req *qr = NULL;
3491         struct se_cmd *se_cmd;
3492         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3493         /*
3494          * Allow ourselves to be interrupted by SIGINT so that a
3495          * connection recovery / failure event can be triggered externally.
3496          */
3497         allow_signal(SIGINT);
3498
3499 restart:
3500         conn = iscsi_tx_thread_pre_handler(ts);
3501         if (!conn)
3502                 goto out;
3503
3504         eodr = map_sg = ret = sent_status = use_misc = 0;
3505
3506         while (!kthread_should_stop()) {
3507                 /*
3508                  * Ensure that both TX and RX per connection kthreads
3509                  * are scheduled to run on the same CPU.
3510                  */
3511                 iscsit_thread_check_cpumask(conn, current, 1);
3512
3513                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3514
3515                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3516                      signal_pending(current))
3517                         goto transport_err;
3518
3519 get_immediate:
3520                 qr = iscsit_get_cmd_from_immediate_queue(conn);
3521                 if (qr) {
3522                         atomic_set(&conn->check_immediate_queue, 0);
3523                         cmd = qr->cmd;
3524                         state = qr->state;
3525                         kmem_cache_free(lio_qr_cache, qr);
3526
3527                         spin_lock_bh(&cmd->istate_lock);
3528                         switch (state) {
3529                         case ISTATE_SEND_R2T:
3530                                 spin_unlock_bh(&cmd->istate_lock);
3531                                 ret = iscsit_send_r2t(cmd, conn);
3532                                 break;
3533                         case ISTATE_REMOVE:
3534                                 spin_unlock_bh(&cmd->istate_lock);
3535
3536                                 if (cmd->data_direction == DMA_TO_DEVICE)
3537                                         iscsit_stop_dataout_timer(cmd);
3538
3539                                 spin_lock_bh(&conn->cmd_lock);
3540                                 list_del(&cmd->i_list);
3541                                 spin_unlock_bh(&conn->cmd_lock);
3542                                 /*
3543                                  * Determine if a struct se_cmd is assoicated with
3544                                  * this struct iscsi_cmd.
3545                                  */
3546                                 if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) &&
3547                                     !(cmd->tmr_req))
3548                                         iscsit_release_cmd(cmd);
3549                                 else
3550                                         transport_generic_free_cmd(&cmd->se_cmd,
3551                                                                 1, 0);
3552                                 goto get_immediate;
3553                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3554                                 spin_unlock_bh(&cmd->istate_lock);
3555                                 iscsit_mod_nopin_response_timer(conn);
3556                                 ret = iscsit_send_unsolicited_nopin(cmd,
3557                                                 conn, 1);
3558                                 break;
3559                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3560                                 spin_unlock_bh(&cmd->istate_lock);
3561                                 ret = iscsit_send_unsolicited_nopin(cmd,
3562                                                 conn, 0);
3563                                 break;
3564                         default:
3565                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3566                                 " 0x%08x, i_state: %d on CID: %hu\n",
3567                                 cmd->iscsi_opcode, cmd->init_task_tag, state,
3568                                 conn->cid);
3569                                 spin_unlock_bh(&cmd->istate_lock);
3570                                 goto transport_err;
3571                         }
3572                         if (ret < 0) {
3573                                 conn->tx_immediate_queue = 0;
3574                                 goto transport_err;
3575                         }
3576
3577                         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3578                                 conn->tx_immediate_queue = 0;
3579                                 iscsit_tx_thread_wait_for_tcp(conn);
3580                                 goto transport_err;
3581                         }
3582
3583                         spin_lock_bh(&cmd->istate_lock);
3584                         switch (state) {
3585                         case ISTATE_SEND_R2T:
3586                                 spin_unlock_bh(&cmd->istate_lock);
3587                                 spin_lock_bh(&cmd->dataout_timeout_lock);
3588                                 iscsit_start_dataout_timer(cmd, conn);
3589                                 spin_unlock_bh(&cmd->dataout_timeout_lock);
3590                                 break;
3591                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3592                                 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3593                                 spin_unlock_bh(&cmd->istate_lock);
3594                                 break;
3595                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3596                                 cmd->i_state = ISTATE_SENT_STATUS;
3597                                 spin_unlock_bh(&cmd->istate_lock);
3598                                 break;
3599                         default:
3600                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3601                                         " 0x%08x, i_state: %d on CID: %hu\n",
3602                                         cmd->iscsi_opcode, cmd->init_task_tag,
3603                                         state, conn->cid);
3604                                 spin_unlock_bh(&cmd->istate_lock);
3605                                 goto transport_err;
3606                         }
3607                         goto get_immediate;
3608                 } else
3609                         conn->tx_immediate_queue = 0;
3610
3611 get_response:
3612                 qr = iscsit_get_cmd_from_response_queue(conn);
3613                 if (qr) {
3614                         cmd = qr->cmd;
3615                         state = qr->state;
3616                         kmem_cache_free(lio_qr_cache, qr);
3617
3618                         spin_lock_bh(&cmd->istate_lock);
3619 check_rsp_state:
3620                         switch (state) {
3621                         case ISTATE_SEND_DATAIN:
3622                                 spin_unlock_bh(&cmd->istate_lock);
3623                                 ret = iscsit_send_data_in(cmd, conn,
3624                                                           &eodr);
3625                                 map_sg = 1;
3626                                 break;
3627                         case ISTATE_SEND_STATUS:
3628                         case ISTATE_SEND_STATUS_RECOVERY:
3629                                 spin_unlock_bh(&cmd->istate_lock);
3630                                 use_misc = 1;
3631                                 ret = iscsit_send_status(cmd, conn);
3632                                 break;
3633                         case ISTATE_SEND_LOGOUTRSP:
3634                                 spin_unlock_bh(&cmd->istate_lock);
3635                                 use_misc = 1;
3636                                 ret = iscsit_send_logout_response(cmd, conn);
3637                                 break;
3638                         case ISTATE_SEND_ASYNCMSG:
3639                                 spin_unlock_bh(&cmd->istate_lock);
3640                                 use_misc = 1;
3641                                 ret = iscsit_send_conn_drop_async_message(
3642                                                 cmd, conn);
3643                                 break;
3644                         case ISTATE_SEND_NOPIN:
3645                                 spin_unlock_bh(&cmd->istate_lock);
3646                                 use_misc = 1;
3647                                 ret = iscsit_send_nopin_response(cmd, conn);
3648                                 break;
3649                         case ISTATE_SEND_REJECT:
3650                                 spin_unlock_bh(&cmd->istate_lock);
3651                                 use_misc = 1;
3652                                 ret = iscsit_send_reject(cmd, conn);
3653                                 break;
3654                         case ISTATE_SEND_TASKMGTRSP:
3655                                 spin_unlock_bh(&cmd->istate_lock);
3656                                 use_misc = 1;
3657                                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3658                                 if (ret != 0)
3659                                         break;
3660                                 ret = iscsit_tmr_post_handler(cmd, conn);
3661                                 if (ret != 0)
3662                                         iscsit_fall_back_to_erl0(conn->sess);
3663                                 break;
3664                         case ISTATE_SEND_TEXTRSP:
3665                                 spin_unlock_bh(&cmd->istate_lock);
3666                                 use_misc = 1;
3667                                 ret = iscsit_send_text_rsp(cmd, conn);
3668                                 break;
3669                         default:
3670                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3671                                         " 0x%08x, i_state: %d on CID: %hu\n",
3672                                         cmd->iscsi_opcode, cmd->init_task_tag,
3673                                         state, conn->cid);
3674                                 spin_unlock_bh(&cmd->istate_lock);
3675                                 goto transport_err;
3676                         }
3677                         if (ret < 0) {
3678                                 conn->tx_response_queue = 0;
3679                                 goto transport_err;
3680                         }
3681
3682                         se_cmd = &cmd->se_cmd;
3683
3684                         if (map_sg && !conn->conn_ops->IFMarker) {
3685                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3686                                         conn->tx_response_queue = 0;
3687                                         iscsit_tx_thread_wait_for_tcp(conn);
3688                                         iscsit_unmap_iovec(cmd);
3689                                         goto transport_err;
3690                                 }
3691                         } else {
3692                                 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3693                                         conn->tx_response_queue = 0;
3694                                         iscsit_tx_thread_wait_for_tcp(conn);
3695                                         iscsit_unmap_iovec(cmd);
3696                                         goto transport_err;
3697                                 }
3698                         }
3699                         map_sg = 0;
3700                         iscsit_unmap_iovec(cmd);
3701
3702                         spin_lock_bh(&cmd->istate_lock);
3703                         switch (state) {
3704                         case ISTATE_SEND_DATAIN:
3705                                 if (!eodr)
3706                                         goto check_rsp_state;
3707
3708                                 if (eodr == 1) {
3709                                         cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3710                                         sent_status = 1;
3711                                         eodr = use_misc = 0;
3712                                 } else if (eodr == 2) {
3713                                         cmd->i_state = state =
3714                                                         ISTATE_SEND_STATUS;
3715                                         sent_status = 0;
3716                                         eodr = use_misc = 0;
3717                                         goto check_rsp_state;
3718                                 }
3719                                 break;
3720                         case ISTATE_SEND_STATUS:
3721                                 use_misc = 0;
3722                                 sent_status = 1;
3723                                 break;
3724                         case ISTATE_SEND_ASYNCMSG:
3725                         case ISTATE_SEND_NOPIN:
3726                         case ISTATE_SEND_STATUS_RECOVERY:
3727                         case ISTATE_SEND_TEXTRSP:
3728                                 use_misc = 0;
3729                                 sent_status = 1;
3730                                 break;
3731                         case ISTATE_SEND_REJECT:
3732                                 use_misc = 0;
3733                                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3734                                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3735                                         spin_unlock_bh(&cmd->istate_lock);
3736                                         complete(&cmd->reject_comp);
3737                                         goto transport_err;
3738                                 }
3739                                 complete(&cmd->reject_comp);
3740                                 break;
3741                         case ISTATE_SEND_TASKMGTRSP:
3742                                 use_misc = 0;
3743                                 sent_status = 1;
3744                                 break;
3745                         case ISTATE_SEND_LOGOUTRSP:
3746                                 spin_unlock_bh(&cmd->istate_lock);
3747                                 if (!iscsit_logout_post_handler(cmd, conn))
3748                                         goto restart;
3749                                 spin_lock_bh(&cmd->istate_lock);
3750                                 use_misc = 0;
3751                                 sent_status = 1;
3752                                 break;
3753                         default:
3754                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3755                                         " 0x%08x, i_state: %d on CID: %hu\n",
3756                                         cmd->iscsi_opcode, cmd->init_task_tag,
3757                                         cmd->i_state, conn->cid);
3758                                 spin_unlock_bh(&cmd->istate_lock);
3759                                 goto transport_err;
3760                         }
3761
3762                         if (sent_status) {
3763                                 cmd->i_state = ISTATE_SENT_STATUS;
3764                                 sent_status = 0;
3765                         }
3766                         spin_unlock_bh(&cmd->istate_lock);
3767
3768                         if (atomic_read(&conn->check_immediate_queue))
3769                                 goto get_immediate;
3770
3771                         goto get_response;
3772                 } else
3773                         conn->tx_response_queue = 0;
3774         }
3775
3776 transport_err:
3777         iscsit_take_action_for_connection_exit(conn);
3778         goto restart;
3779 out:
3780         return 0;
3781 }
3782
3783 int iscsi_target_rx_thread(void *arg)
3784 {
3785         int ret;
3786         u8 buffer[ISCSI_HDR_LEN], opcode;
3787         u32 checksum = 0, digest = 0;
3788         struct iscsi_conn *conn = NULL;
3789         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3790         struct kvec iov;
3791         /*
3792          * Allow ourselves to be interrupted by SIGINT so that a
3793          * connection recovery / failure event can be triggered externally.
3794          */
3795         allow_signal(SIGINT);
3796
3797 restart:
3798         conn = iscsi_rx_thread_pre_handler(ts);
3799         if (!conn)
3800                 goto out;
3801
3802         while (!kthread_should_stop()) {
3803                 /*
3804                  * Ensure that both TX and RX per connection kthreads
3805                  * are scheduled to run on the same CPU.
3806                  */
3807                 iscsit_thread_check_cpumask(conn, current, 0);
3808
3809                 memset(buffer, 0, ISCSI_HDR_LEN);
3810                 memset(&iov, 0, sizeof(struct kvec));
3811
3812                 iov.iov_base    = buffer;
3813                 iov.iov_len     = ISCSI_HDR_LEN;
3814
3815                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3816                 if (ret != ISCSI_HDR_LEN) {
3817                         iscsit_rx_thread_wait_for_tcp(conn);
3818                         goto transport_err;
3819                 }
3820
3821                 /*
3822                  * Set conn->bad_hdr for use with REJECT PDUs.
3823                  */
3824                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3825
3826                 if (conn->conn_ops->HeaderDigest) {
3827                         iov.iov_base    = &digest;
3828                         iov.iov_len     = ISCSI_CRC_LEN;
3829
3830                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3831                         if (ret != ISCSI_CRC_LEN) {
3832                                 iscsit_rx_thread_wait_for_tcp(conn);
3833                                 goto transport_err;
3834                         }
3835
3836                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3837                                         buffer, ISCSI_HDR_LEN,
3838                                         0, NULL, (u8 *)&checksum);
3839
3840                         if (digest != checksum) {
3841                                 pr_err("HeaderDigest CRC32C failed,"
3842                                         " received 0x%08x, computed 0x%08x\n",
3843                                         digest, checksum);
3844                                 /*
3845                                  * Set the PDU to 0xff so it will intentionally
3846                                  * hit default in the switch below.
3847                                  */
3848                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3849                                 spin_lock_bh(&conn->sess->session_stats_lock);
3850                                 conn->sess->conn_digest_errors++;
3851                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3852                         } else {
3853                                 pr_debug("Got HeaderDigest CRC32C"
3854                                                 " 0x%08x\n", checksum);
3855                         }
3856                 }
3857
3858                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3859                         goto transport_err;
3860
3861                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3862
3863                 if (conn->sess->sess_ops->SessionType &&
3864                    ((!(opcode & ISCSI_OP_TEXT)) ||
3865                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3866                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3867                         " while in Discovery Session, rejecting.\n", opcode);
3868                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3869                                         buffer, conn);
3870                         goto transport_err;
3871                 }
3872
3873                 switch (opcode) {
3874                 case ISCSI_OP_SCSI_CMD:
3875                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3876                                 goto transport_err;
3877                         break;
3878                 case ISCSI_OP_SCSI_DATA_OUT:
3879                         if (iscsit_handle_data_out(conn, buffer) < 0)
3880                                 goto transport_err;
3881                         break;
3882                 case ISCSI_OP_NOOP_OUT:
3883                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3884                                 goto transport_err;
3885                         break;
3886                 case ISCSI_OP_SCSI_TMFUNC:
3887                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3888                                 goto transport_err;
3889                         break;
3890                 case ISCSI_OP_TEXT:
3891                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3892                                 goto transport_err;
3893                         break;
3894                 case ISCSI_OP_LOGOUT:
3895                         ret = iscsit_handle_logout_cmd(conn, buffer);
3896                         if (ret > 0) {
3897                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3898                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3899                                 goto transport_err;
3900                         } else if (ret < 0)
3901                                 goto transport_err;
3902                         break;
3903                 case ISCSI_OP_SNACK:
3904                         if (iscsit_handle_snack(conn, buffer) < 0)
3905                                 goto transport_err;
3906                         break;
3907                 default:
3908                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3909                                         opcode);
3910                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3911                                 pr_err("Cannot recover from unknown"
3912                                 " opcode while ERL=0, closing iSCSI connection"
3913                                 ".\n");
3914                                 goto transport_err;
3915                         }
3916                         if (!conn->conn_ops->OFMarker) {
3917                                 pr_err("Unable to recover from unknown"
3918                                 " opcode while OFMarker=No, closing iSCSI"
3919                                         " connection.\n");
3920                                 goto transport_err;
3921                         }
3922                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3923                                 pr_err("Unable to recover from unknown"
3924                                         " opcode, closing iSCSI connection.\n");
3925                                 goto transport_err;
3926                         }
3927                         break;
3928                 }
3929         }
3930
3931 transport_err:
3932         if (!signal_pending(current))
3933                 atomic_set(&conn->transport_failed, 1);
3934         iscsit_take_action_for_connection_exit(conn);
3935         goto restart;
3936 out:
3937         return 0;
3938 }
3939
3940 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3941 {
3942         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3943         struct iscsi_session *sess = conn->sess;
3944         struct se_cmd *se_cmd;
3945         /*
3946          * We expect this function to only ever be called from either RX or TX
3947          * thread context via iscsit_close_connection() once the other context
3948          * has been reset -> returned sleeping pre-handler state.
3949          */
3950         spin_lock_bh(&conn->cmd_lock);
3951         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3952                 if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) {
3953
3954                         list_del(&cmd->i_list);
3955                         spin_unlock_bh(&conn->cmd_lock);
3956                         iscsit_increment_maxcmdsn(cmd, sess);
3957                         se_cmd = &cmd->se_cmd;
3958                         /*
3959                          * Special cases for active iSCSI TMR, and
3960                          * transport_lookup_cmd_lun() failing from
3961                          * iscsit_get_lun_for_cmd() in iscsit_handle_scsi_cmd().
3962                          */
3963                         if (cmd->tmr_req && se_cmd->transport_wait_for_tasks)
3964                                 se_cmd->transport_wait_for_tasks(se_cmd, 1, 1);
3965                         else if (cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)
3966                                 transport_release_cmd(se_cmd);
3967                         else
3968                                 iscsit_release_cmd(cmd);
3969
3970                         spin_lock_bh(&conn->cmd_lock);
3971                         continue;
3972                 }
3973                 list_del(&cmd->i_list);
3974                 spin_unlock_bh(&conn->cmd_lock);
3975
3976                 iscsit_increment_maxcmdsn(cmd, sess);
3977                 se_cmd = &cmd->se_cmd;
3978
3979                 if (se_cmd->transport_wait_for_tasks)
3980                         se_cmd->transport_wait_for_tasks(se_cmd, 1, 1);
3981
3982                 spin_lock_bh(&conn->cmd_lock);
3983         }
3984         spin_unlock_bh(&conn->cmd_lock);
3985 }
3986
3987 static void iscsit_stop_timers_for_cmds(
3988         struct iscsi_conn *conn)
3989 {
3990         struct iscsi_cmd *cmd;
3991
3992         spin_lock_bh(&conn->cmd_lock);
3993         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3994                 if (cmd->data_direction == DMA_TO_DEVICE)
3995                         iscsit_stop_dataout_timer(cmd);
3996         }
3997         spin_unlock_bh(&conn->cmd_lock);
3998 }
3999
4000 int iscsit_close_connection(
4001         struct iscsi_conn *conn)
4002 {
4003         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4004         struct iscsi_session    *sess = conn->sess;
4005
4006         pr_debug("Closing iSCSI connection CID %hu on SID:"
4007                 " %u\n", conn->cid, sess->sid);
4008         /*
4009          * Always up conn_logout_comp just in case the RX Thread is sleeping
4010          * and the logout response never got sent because the connection
4011          * failed.
4012          */
4013         complete(&conn->conn_logout_comp);
4014
4015         iscsi_release_thread_set(conn);
4016
4017         iscsit_stop_timers_for_cmds(conn);
4018         iscsit_stop_nopin_response_timer(conn);
4019         iscsit_stop_nopin_timer(conn);
4020         iscsit_free_queue_reqs_for_conn(conn);
4021
4022         /*
4023          * During Connection recovery drop unacknowledged out of order
4024          * commands for this connection, and prepare the other commands
4025          * for realligence.
4026          *
4027          * During normal operation clear the out of order commands (but
4028          * do not free the struct iscsi_ooo_cmdsn's) and release all
4029          * struct iscsi_cmds.
4030          */
4031         if (atomic_read(&conn->connection_recovery)) {
4032                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4033                 iscsit_prepare_cmds_for_realligance(conn);
4034         } else {
4035                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4036                 iscsit_release_commands_from_conn(conn);
4037         }
4038
4039         /*
4040          * Handle decrementing session or connection usage count if
4041          * a logout response was not able to be sent because the
4042          * connection failed.  Fall back to Session Recovery here.
4043          */
4044         if (atomic_read(&conn->conn_logout_remove)) {
4045                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4046                         iscsit_dec_conn_usage_count(conn);
4047                         iscsit_dec_session_usage_count(sess);
4048                 }
4049                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4050                         iscsit_dec_conn_usage_count(conn);
4051
4052                 atomic_set(&conn->conn_logout_remove, 0);
4053                 atomic_set(&sess->session_reinstatement, 0);
4054                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4055         }
4056
4057         spin_lock_bh(&sess->conn_lock);
4058         list_del(&conn->conn_list);
4059
4060         /*
4061          * Attempt to let the Initiator know this connection failed by
4062          * sending an Connection Dropped Async Message on another
4063          * active connection.
4064          */
4065         if (atomic_read(&conn->connection_recovery))
4066                 iscsit_build_conn_drop_async_message(conn);
4067
4068         spin_unlock_bh(&sess->conn_lock);
4069
4070         /*
4071          * If connection reinstatement is being performed on this connection,
4072          * up the connection reinstatement semaphore that is being blocked on
4073          * in iscsit_cause_connection_reinstatement().
4074          */
4075         spin_lock_bh(&conn->state_lock);
4076         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4077                 spin_unlock_bh(&conn->state_lock);
4078                 complete(&conn->conn_wait_comp);
4079                 wait_for_completion(&conn->conn_post_wait_comp);
4080                 spin_lock_bh(&conn->state_lock);
4081         }
4082
4083         /*
4084          * If connection reinstatement is being performed on this connection
4085          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4086          * connection wait rcfr semaphore that is being blocked on
4087          * an iscsit_connection_reinstatement_rcfr().
4088          */
4089         if (atomic_read(&conn->connection_wait_rcfr)) {
4090                 spin_unlock_bh(&conn->state_lock);
4091                 complete(&conn->conn_wait_rcfr_comp);
4092                 wait_for_completion(&conn->conn_post_wait_comp);
4093                 spin_lock_bh(&conn->state_lock);
4094         }
4095         atomic_set(&conn->connection_reinstatement, 1);
4096         spin_unlock_bh(&conn->state_lock);
4097
4098         /*
4099          * If any other processes are accessing this connection pointer we
4100          * must wait until they have completed.
4101          */
4102         iscsit_check_conn_usage_count(conn);
4103
4104         if (conn->conn_rx_hash.tfm)
4105                 crypto_free_hash(conn->conn_rx_hash.tfm);
4106         if (conn->conn_tx_hash.tfm)
4107                 crypto_free_hash(conn->conn_tx_hash.tfm);
4108
4109         if (conn->conn_cpumask)
4110                 free_cpumask_var(conn->conn_cpumask);
4111
4112         kfree(conn->conn_ops);
4113         conn->conn_ops = NULL;
4114
4115         if (conn->sock) {
4116                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4117                         kfree(conn->sock->file);
4118                         conn->sock->file = NULL;
4119                 }
4120                 sock_release(conn->sock);
4121         }
4122         conn->thread_set = NULL;
4123
4124         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4125         conn->conn_state = TARG_CONN_STATE_FREE;
4126         kfree(conn);
4127
4128         spin_lock_bh(&sess->conn_lock);
4129         atomic_dec(&sess->nconn);
4130         pr_debug("Decremented iSCSI connection count to %hu from node:"
4131                 " %s\n", atomic_read(&sess->nconn),
4132                 sess->sess_ops->InitiatorName);
4133         /*
4134          * Make sure that if one connection fails in an non ERL=2 iSCSI
4135          * Session that they all fail.
4136          */
4137         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4138              !atomic_read(&sess->session_logout))
4139                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4140
4141         /*
4142          * If this was not the last connection in the session, and we are
4143          * performing session reinstatement or falling back to ERL=0, call
4144          * iscsit_stop_session() without sleeping to shutdown the other
4145          * active connections.
4146          */
4147         if (atomic_read(&sess->nconn)) {
4148                 if (!atomic_read(&sess->session_reinstatement) &&
4149                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4150                         spin_unlock_bh(&sess->conn_lock);
4151                         return 0;
4152                 }
4153                 if (!atomic_read(&sess->session_stop_active)) {
4154                         atomic_set(&sess->session_stop_active, 1);
4155                         spin_unlock_bh(&sess->conn_lock);
4156                         iscsit_stop_session(sess, 0, 0);
4157                         return 0;
4158                 }
4159                 spin_unlock_bh(&sess->conn_lock);
4160                 return 0;
4161         }
4162
4163         /*
4164          * If this was the last connection in the session and one of the
4165          * following is occurring:
4166          *
4167          * Session Reinstatement is not being performed, and are falling back
4168          * to ERL=0 call iscsit_close_session().
4169          *
4170          * Session Logout was requested.  iscsit_close_session() will be called
4171          * elsewhere.
4172          *
4173          * Session Continuation is not being performed, start the Time2Retain
4174          * handler and check if sleep_on_sess_wait_sem is active.
4175          */
4176         if (!atomic_read(&sess->session_reinstatement) &&
4177              atomic_read(&sess->session_fall_back_to_erl0)) {
4178                 spin_unlock_bh(&sess->conn_lock);
4179                 iscsit_close_session(sess);
4180
4181                 return 0;
4182         } else if (atomic_read(&sess->session_logout)) {
4183                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4184                 sess->session_state = TARG_SESS_STATE_FREE;
4185                 spin_unlock_bh(&sess->conn_lock);
4186
4187                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4188                         complete(&sess->session_wait_comp);
4189
4190                 return 0;
4191         } else {
4192                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4193                 sess->session_state = TARG_SESS_STATE_FAILED;
4194
4195                 if (!atomic_read(&sess->session_continuation)) {
4196                         spin_unlock_bh(&sess->conn_lock);
4197                         iscsit_start_time2retain_handler(sess);
4198                 } else
4199                         spin_unlock_bh(&sess->conn_lock);
4200
4201                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4202                         complete(&sess->session_wait_comp);
4203
4204                 return 0;
4205         }
4206         spin_unlock_bh(&sess->conn_lock);
4207
4208         return 0;
4209 }
4210
4211 int iscsit_close_session(struct iscsi_session *sess)
4212 {
4213         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4214         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4215
4216         if (atomic_read(&sess->nconn)) {
4217                 pr_err("%d connection(s) still exist for iSCSI session"
4218                         " to %s\n", atomic_read(&sess->nconn),
4219                         sess->sess_ops->InitiatorName);
4220                 BUG();
4221         }
4222
4223         spin_lock_bh(&se_tpg->session_lock);
4224         atomic_set(&sess->session_logout, 1);
4225         atomic_set(&sess->session_reinstatement, 1);
4226         iscsit_stop_time2retain_timer(sess);
4227         spin_unlock_bh(&se_tpg->session_lock);
4228
4229         /*
4230          * transport_deregister_session_configfs() will clear the
4231          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4232          * can be setting it again with __transport_register_session() in
4233          * iscsi_post_login_handler() again after the iscsit_stop_session()
4234          * completes in iscsi_np context.
4235          */
4236         transport_deregister_session_configfs(sess->se_sess);
4237
4238         /*
4239          * If any other processes are accessing this session pointer we must
4240          * wait until they have completed.  If we are in an interrupt (the
4241          * time2retain handler) and contain and active session usage count we
4242          * restart the timer and exit.
4243          */
4244         if (!in_interrupt()) {
4245                 if (iscsit_check_session_usage_count(sess) == 1)
4246                         iscsit_stop_session(sess, 1, 1);
4247         } else {
4248                 if (iscsit_check_session_usage_count(sess) == 2) {
4249                         atomic_set(&sess->session_logout, 0);
4250                         iscsit_start_time2retain_handler(sess);
4251                         return 0;
4252                 }
4253         }
4254
4255         transport_deregister_session(sess->se_sess);
4256
4257         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4258                 iscsit_free_connection_recovery_entires(sess);
4259
4260         iscsit_free_all_ooo_cmdsns(sess);
4261
4262         spin_lock_bh(&se_tpg->session_lock);
4263         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4264         sess->session_state = TARG_SESS_STATE_FREE;
4265         pr_debug("Released iSCSI session from node: %s\n",
4266                         sess->sess_ops->InitiatorName);
4267         tpg->nsessions--;
4268         if (tpg->tpg_tiqn)
4269                 tpg->tpg_tiqn->tiqn_nsessions--;
4270
4271         pr_debug("Decremented number of active iSCSI Sessions on"
4272                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4273
4274         spin_lock(&sess_idr_lock);
4275         idr_remove(&sess_idr, sess->session_index);
4276         spin_unlock(&sess_idr_lock);
4277
4278         kfree(sess->sess_ops);
4279         sess->sess_ops = NULL;
4280         spin_unlock_bh(&se_tpg->session_lock);
4281
4282         kfree(sess);
4283         return 0;
4284 }
4285
4286 static void iscsit_logout_post_handler_closesession(
4287         struct iscsi_conn *conn)
4288 {
4289         struct iscsi_session *sess = conn->sess;
4290
4291         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4292         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4293
4294         atomic_set(&conn->conn_logout_remove, 0);
4295         complete(&conn->conn_logout_comp);
4296
4297         iscsit_dec_conn_usage_count(conn);
4298         iscsit_stop_session(sess, 1, 1);
4299         iscsit_dec_session_usage_count(sess);
4300         iscsit_close_session(sess);
4301 }
4302
4303 static void iscsit_logout_post_handler_samecid(
4304         struct iscsi_conn *conn)
4305 {
4306         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4307         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4308
4309         atomic_set(&conn->conn_logout_remove, 0);
4310         complete(&conn->conn_logout_comp);
4311
4312         iscsit_cause_connection_reinstatement(conn, 1);
4313         iscsit_dec_conn_usage_count(conn);
4314 }
4315
4316 static void iscsit_logout_post_handler_diffcid(
4317         struct iscsi_conn *conn,
4318         u16 cid)
4319 {
4320         struct iscsi_conn *l_conn;
4321         struct iscsi_session *sess = conn->sess;
4322
4323         if (!sess)
4324                 return;
4325
4326         spin_lock_bh(&sess->conn_lock);
4327         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4328                 if (l_conn->cid == cid) {
4329                         iscsit_inc_conn_usage_count(l_conn);
4330                         break;
4331                 }
4332         }
4333         spin_unlock_bh(&sess->conn_lock);
4334
4335         if (!l_conn)
4336                 return;
4337
4338         if (l_conn->sock)
4339                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4340
4341         spin_lock_bh(&l_conn->state_lock);
4342         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4343         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4344         spin_unlock_bh(&l_conn->state_lock);
4345
4346         iscsit_cause_connection_reinstatement(l_conn, 1);
4347         iscsit_dec_conn_usage_count(l_conn);
4348 }
4349
4350 /*
4351  *      Return of 0 causes the TX thread to restart.
4352  */
4353 static int iscsit_logout_post_handler(
4354         struct iscsi_cmd *cmd,
4355         struct iscsi_conn *conn)
4356 {
4357         int ret = 0;
4358
4359         switch (cmd->logout_reason) {
4360         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4361                 switch (cmd->logout_response) {
4362                 case ISCSI_LOGOUT_SUCCESS:
4363                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4364                 default:
4365                         iscsit_logout_post_handler_closesession(conn);
4366                         break;
4367                 }
4368                 ret = 0;
4369                 break;
4370         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4371                 if (conn->cid == cmd->logout_cid) {
4372                         switch (cmd->logout_response) {
4373                         case ISCSI_LOGOUT_SUCCESS:
4374                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4375                         default:
4376                                 iscsit_logout_post_handler_samecid(conn);
4377                                 break;
4378                         }
4379                         ret = 0;
4380                 } else {
4381                         switch (cmd->logout_response) {
4382                         case ISCSI_LOGOUT_SUCCESS:
4383                                 iscsit_logout_post_handler_diffcid(conn,
4384                                         cmd->logout_cid);
4385                                 break;
4386                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4387                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4388                         default:
4389                                 break;
4390                         }
4391                         ret = 1;
4392                 }
4393                 break;
4394         case ISCSI_LOGOUT_REASON_RECOVERY:
4395                 switch (cmd->logout_response) {
4396                 case ISCSI_LOGOUT_SUCCESS:
4397                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4398                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4399                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4400                 default:
4401                         break;
4402                 }
4403                 ret = 1;
4404                 break;
4405         default:
4406                 break;
4407
4408         }
4409         return ret;
4410 }
4411
4412 void iscsit_fail_session(struct iscsi_session *sess)
4413 {
4414         struct iscsi_conn *conn;
4415
4416         spin_lock_bh(&sess->conn_lock);
4417         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4418                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4419                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4420         }
4421         spin_unlock_bh(&sess->conn_lock);
4422
4423         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4424         sess->session_state = TARG_SESS_STATE_FAILED;
4425 }
4426
4427 int iscsit_free_session(struct iscsi_session *sess)
4428 {
4429         u16 conn_count = atomic_read(&sess->nconn);
4430         struct iscsi_conn *conn, *conn_tmp = NULL;
4431         int is_last;
4432
4433         spin_lock_bh(&sess->conn_lock);
4434         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4435
4436         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4437                         conn_list) {
4438                 if (conn_count == 0)
4439                         break;
4440
4441                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4442                         is_last = 1;
4443                 } else {
4444                         iscsit_inc_conn_usage_count(conn_tmp);
4445                         is_last = 0;
4446                 }
4447                 iscsit_inc_conn_usage_count(conn);
4448
4449                 spin_unlock_bh(&sess->conn_lock);
4450                 iscsit_cause_connection_reinstatement(conn, 1);
4451                 spin_lock_bh(&sess->conn_lock);
4452
4453                 iscsit_dec_conn_usage_count(conn);
4454                 if (is_last == 0)
4455                         iscsit_dec_conn_usage_count(conn_tmp);
4456
4457                 conn_count--;
4458         }
4459
4460         if (atomic_read(&sess->nconn)) {
4461                 spin_unlock_bh(&sess->conn_lock);
4462                 wait_for_completion(&sess->session_wait_comp);
4463         } else
4464                 spin_unlock_bh(&sess->conn_lock);
4465
4466         iscsit_close_session(sess);
4467         return 0;
4468 }
4469
4470 void iscsit_stop_session(
4471         struct iscsi_session *sess,
4472         int session_sleep,
4473         int connection_sleep)
4474 {
4475         u16 conn_count = atomic_read(&sess->nconn);
4476         struct iscsi_conn *conn, *conn_tmp = NULL;
4477         int is_last;
4478
4479         spin_lock_bh(&sess->conn_lock);
4480         if (session_sleep)
4481                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4482
4483         if (connection_sleep) {
4484                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4485                                 conn_list) {
4486                         if (conn_count == 0)
4487                                 break;
4488
4489                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4490                                 is_last = 1;
4491                         } else {
4492                                 iscsit_inc_conn_usage_count(conn_tmp);
4493                                 is_last = 0;
4494                         }
4495                         iscsit_inc_conn_usage_count(conn);
4496
4497                         spin_unlock_bh(&sess->conn_lock);
4498                         iscsit_cause_connection_reinstatement(conn, 1);
4499                         spin_lock_bh(&sess->conn_lock);
4500
4501                         iscsit_dec_conn_usage_count(conn);
4502                         if (is_last == 0)
4503                                 iscsit_dec_conn_usage_count(conn_tmp);
4504                         conn_count--;
4505                 }
4506         } else {
4507                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4508                         iscsit_cause_connection_reinstatement(conn, 0);
4509         }
4510
4511         if (session_sleep && atomic_read(&sess->nconn)) {
4512                 spin_unlock_bh(&sess->conn_lock);
4513                 wait_for_completion(&sess->session_wait_comp);
4514         } else
4515                 spin_unlock_bh(&sess->conn_lock);
4516 }
4517
4518 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4519 {
4520         struct iscsi_session *sess;
4521         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4522         struct se_session *se_sess, *se_sess_tmp;
4523         int session_count = 0;
4524
4525         spin_lock_bh(&se_tpg->session_lock);
4526         if (tpg->nsessions && !force) {
4527                 spin_unlock_bh(&se_tpg->session_lock);
4528                 return -1;
4529         }
4530
4531         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4532                         sess_list) {
4533                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4534
4535                 spin_lock(&sess->conn_lock);
4536                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4537                     atomic_read(&sess->session_logout) ||
4538                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4539                         spin_unlock(&sess->conn_lock);
4540                         continue;
4541                 }
4542                 atomic_set(&sess->session_reinstatement, 1);
4543                 spin_unlock(&sess->conn_lock);
4544                 spin_unlock_bh(&se_tpg->session_lock);
4545
4546                 iscsit_free_session(sess);
4547                 spin_lock_bh(&se_tpg->session_lock);
4548
4549                 session_count++;
4550         }
4551         spin_unlock_bh(&se_tpg->session_lock);
4552
4553         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4554                         " Group: %hu\n", session_count, tpg->tpgt);
4555         return 0;
4556 }
4557
4558 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4559 MODULE_VERSION("4.1.x");
4560 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4561 MODULE_LICENSE("GPL");
4562
4563 module_init(iscsi_target_init_module);
4564 module_exit(iscsi_target_cleanup_module);