drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <linux/idr.h>
  27 #include <asm/unaligned.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/iscsi_proto.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <target/target_core_base.h>
  32 #include <target/target_core_fabric.h>
  33 #include <target/target_core_configfs.h>
  34
  35 #include "iscsi_target_core.h"
  36 #include "iscsi_target_parameters.h"
  37 #include "iscsi_target_seq_pdu_list.h"
  38 #include "iscsi_target_tq.h"
  39 #include "iscsi_target_configfs.h"
  40 #include "iscsi_target_datain_values.h"
  41 #include "iscsi_target_erl0.h"
  42 #include "iscsi_target_erl1.h"
  43 #include "iscsi_target_erl2.h"
  44 #include "iscsi_target_login.h"
  45 #include "iscsi_target_tmr.h"
  46 #include "iscsi_target_tpg.h"
  47 #include "iscsi_target_util.h"
  48 #include "iscsi_target.h"
  49 #include "iscsi_target_device.h"
  50 #include "iscsi_target_stat.h"
  51
  52 #include <target/iscsi/iscsi_transport.h>
  53
  54 static LIST_HEAD(g_tiqn_list);
  55 static LIST_HEAD(g_np_list);
  56 static DEFINE_SPINLOCK(tiqn_lock);
  57 static DEFINE_SPINLOCK(np_lock);
  58
  59 static struct idr tiqn_idr;
  60 struct idr sess_idr;
  61 struct mutex auth_id_lock;
  62 spinlock_t sess_idr_lock;
  63
  64 struct iscsit_global *iscsit_global;
  65
  66 struct kmem_cache *lio_cmd_cache;
  67 struct kmem_cache *lio_qr_cache;
  68 struct kmem_cache *lio_dr_cache;
  69 struct kmem_cache *lio_ooo_cache;
  70 struct kmem_cache *lio_r2t_cache;
  71
  72 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  73                         struct iscsi_scsi_req *, u32);
  74
  75 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  76 {
  77         struct iscsi_tiqn *tiqn = NULL;
  78
  79         spin_lock(&tiqn_lock);
  80         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  81                 if (!strcmp(tiqn->tiqn, buf)) {
  82
  83                         spin_lock(&tiqn->tiqn_state_lock);
  84                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  85                                 tiqn->tiqn_access_count++;
  86                                 spin_unlock(&tiqn->tiqn_state_lock);
  87                                 spin_unlock(&tiqn_lock);
  88                                 return tiqn;
  89                         }
  90                         spin_unlock(&tiqn->tiqn_state_lock);
  91                 }
  92         }
  93         spin_unlock(&tiqn_lock);
  94
  95         return NULL;
  96 }
  97
  98 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  99 {
 100         spin_lock(&tiqn->tiqn_state_lock);
 101         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 102                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 103                 spin_unlock(&tiqn->tiqn_state_lock);
 104                 return 0;
 105         }
 106         spin_unlock(&tiqn->tiqn_state_lock);
 107
 108         return -1;
 109 }
 110
 111 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 112 {
 113         spin_lock(&tiqn->tiqn_state_lock);
 114         tiqn->tiqn_access_count--;
 115         spin_unlock(&tiqn->tiqn_state_lock);
 116 }
 117
 118 /*
 119  * Note that IQN formatting is expected to be done in userspace, and
 120  * no explict IQN format checks are done here.
 121  */
 122 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 123 {
 124         struct iscsi_tiqn *tiqn = NULL;
 125         int ret;
 126
 127         if (strlen(buf) >= ISCSI_IQN_LEN) {
 128                 pr_err("Target IQN exceeds %d bytes\n",
 129                                 ISCSI_IQN_LEN);
 130                 return ERR_PTR(-EINVAL);
 131         }
 132
 133         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 134         if (!tiqn) {
 135                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 136                 return ERR_PTR(-ENOMEM);
 137         }
 138
 139         sprintf(tiqn->tiqn, "%s", buf);
 140         INIT_LIST_HEAD(&tiqn->tiqn_list);
 141         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 142         spin_lock_init(&tiqn->tiqn_state_lock);
 143         spin_lock_init(&tiqn->tiqn_tpg_lock);
 144         spin_lock_init(&tiqn->sess_err_stats.lock);
 145         spin_lock_init(&tiqn->login_stats.lock);
 146         spin_lock_init(&tiqn->logout_stats.lock);
 147
 148         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 149
 150         idr_preload(GFP_KERNEL);
 151         spin_lock(&tiqn_lock);
 152
 153         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 154         if (ret < 0) {
 155                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 156                 spin_unlock(&tiqn_lock);
 157                 idr_preload_end();
 158                 kfree(tiqn);
 159                 return ERR_PTR(ret);
 160         }
 161         tiqn->tiqn_index = ret;
 162         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 163
 164         spin_unlock(&tiqn_lock);
 165         idr_preload_end();
 166
 167         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 168
 169         return tiqn;
 170
 171 }
 172
 173 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 174 {
 175         /*
 176          * Wait for accesses to said struct iscsi_tiqn to end.
 177          */
 178         spin_lock(&tiqn->tiqn_state_lock);
 179         while (tiqn->tiqn_access_count != 0) {
 180                 spin_unlock(&tiqn->tiqn_state_lock);
 181                 msleep(10);
 182                 spin_lock(&tiqn->tiqn_state_lock);
 183         }
 184         spin_unlock(&tiqn->tiqn_state_lock);
 185 }
 186
 187 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 188 {
 189         /*
 190          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 191          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 192          * attempts to access this struct iscsi_tiqn will fail from both transport
 193          * fabric and control code paths.
 194          */
 195         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 196                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 197                 return;
 198         }
 199
 200         iscsit_wait_for_tiqn(tiqn);
 201
 202         spin_lock(&tiqn_lock);
 203         list_del(&tiqn->tiqn_list);
 204         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 205         spin_unlock(&tiqn_lock);
 206
 207         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 208                         tiqn->tiqn);
 209         kfree(tiqn);
 210 }
 211
 212 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 213 {
 214         int ret;
 215         /*
 216          * Determine if the network portal is accepting storage traffic.
 217          */
 218         spin_lock_bh(&np->np_thread_lock);
 219         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 220                 spin_unlock_bh(&np->np_thread_lock);
 221                 return -1;
 222         }
 223         if (np->np_login_tpg) {
 224                 pr_err("np->np_login_tpg() is not NULL!\n");
 225                 spin_unlock_bh(&np->np_thread_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&np->np_thread_lock);
 229         /*
 230          * Determine if the portal group is accepting storage traffic.
 231          */
 232         spin_lock_bh(&tpg->tpg_state_lock);
 233         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 234                 spin_unlock_bh(&tpg->tpg_state_lock);
 235                 return -1;
 236         }
 237         spin_unlock_bh(&tpg->tpg_state_lock);
 238
 239         /*
 240          * Here we serialize access across the TIQN+TPG Tuple.
 241          */
 242         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 243         if ((ret != 0) || signal_pending(current))
 244                 return -1;
 245
 246         spin_lock_bh(&np->np_thread_lock);
 247         np->np_login_tpg = tpg;
 248         spin_unlock_bh(&np->np_thread_lock);
 249
 250         return 0;
 251 }
 252
 253 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 254 {
 255         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 256
 257         spin_lock_bh(&np->np_thread_lock);
 258         np->np_login_tpg = NULL;
 259         spin_unlock_bh(&np->np_thread_lock);
 260
 261         mutex_unlock(&tpg->np_login_lock);
 262
 263         if (tiqn)
 264                 iscsit_put_tiqn_for_login(tiqn);
 265
 266         return 0;
 267 }
 268
 269 bool iscsit_check_np_match(
 270         struct __kernel_sockaddr_storage *sockaddr,
 271         struct iscsi_np *np,
 272         int network_transport)
 273 {
 274         struct sockaddr_in *sock_in, *sock_in_e;
 275         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 276         bool ip_match = false;
 277         u16 port;
 278
 279         if (sockaddr->ss_family == AF_INET6) {
 280                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 281                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 282
 283                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 284                             &sock_in6_e->sin6_addr.in6_u,
 285                             sizeof(struct in6_addr)))
 286                         ip_match = true;
 287
 288                 port = ntohs(sock_in6->sin6_port);
 289         } else {
 290                 sock_in = (struct sockaddr_in *)sockaddr;
 291                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 292
 293                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 294                         ip_match = true;
 295
 296                 port = ntohs(sock_in->sin_port);
 297         }
 298
 299         if ((ip_match == true) && (np->np_port == port) &&
 300             (np->np_network_transport == network_transport))
 301                 return true;
 302
 303         return false;
 304 }
 305
 306 static struct iscsi_np *iscsit_get_np(
 307         struct __kernel_sockaddr_storage *sockaddr,
 308         int network_transport)
 309 {
 310         struct iscsi_np *np;
 311         bool match;
 312
 313         spin_lock_bh(&np_lock);
 314         list_for_each_entry(np, &g_np_list, np_list) {
 315                 spin_lock(&np->np_thread_lock);
 316                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 317                         spin_unlock(&np->np_thread_lock);
 318                         continue;
 319                 }
 320
 321                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 322                 if (match == true) {
 323                         /*
 324                          * Increment the np_exports reference count now to
 325                          * prevent iscsit_del_np() below from being called
 326                          * while iscsi_tpg_add_network_portal() is called.
 327                          */
 328                         np->np_exports++;
 329                         spin_unlock(&np->np_thread_lock);
 330                         spin_unlock_bh(&np_lock);
 331                         return np;
 332                 }
 333                 spin_unlock(&np->np_thread_lock);
 334         }
 335         spin_unlock_bh(&np_lock);
 336
 337         return NULL;
 338 }
 339
 340 struct iscsi_np *iscsit_add_np(
 341         struct __kernel_sockaddr_storage *sockaddr,
 342         char *ip_str,
 343         int network_transport)
 344 {
 345         struct sockaddr_in *sock_in;
 346         struct sockaddr_in6 *sock_in6;
 347         struct iscsi_np *np;
 348         int ret;
 349         /*
 350          * Locate the existing struct iscsi_np if already active..
 351          */
 352         np = iscsit_get_np(sockaddr, network_transport);
 353         if (np)
 354                 return np;
 355
 356         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 357         if (!np) {
 358                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 359                 return ERR_PTR(-ENOMEM);
 360         }
 361
 362         np->np_flags |= NPF_IP_NETWORK;
 363         if (sockaddr->ss_family == AF_INET6) {
 364                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 365                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 366                 np->np_port = ntohs(sock_in6->sin6_port);
 367         } else {
 368                 sock_in = (struct sockaddr_in *)sockaddr;
 369                 sprintf(np->np_ip, "%s", ip_str);
 370                 np->np_port = ntohs(sock_in->sin_port);
 371         }
 372
 373         np->np_network_transport = network_transport;
 374         spin_lock_init(&np->np_thread_lock);
 375         init_completion(&np->np_restart_comp);
 376         INIT_LIST_HEAD(&np->np_list);
 377
 378         ret = iscsi_target_setup_login_socket(np, sockaddr);
 379         if (ret != 0) {
 380                 kfree(np);
 381                 return ERR_PTR(ret);
 382         }
 383
 384         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 385         if (IS_ERR(np->np_thread)) {
 386                 pr_err("Unable to create kthread: iscsi_np\n");
 387                 ret = PTR_ERR(np->np_thread);
 388                 kfree(np);
 389                 return ERR_PTR(ret);
 390         }
 391         /*
 392          * Increment the np_exports reference count now to prevent
 393          * iscsit_del_np() below from being run while a new call to
 394          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 395          * active.  We don't need to hold np->np_thread_lock at this
 396          * point because iscsi_np has not been added to g_np_list yet.
 397          */
 398         np->np_exports = 1;
 399
 400         spin_lock_bh(&np_lock);
 401         list_add_tail(&np->np_list, &g_np_list);
 402         spin_unlock_bh(&np_lock);
 403
 404         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 405                 np->np_ip, np->np_port, np->np_transport->name);
 406
 407         return np;
 408 }
 409
 410 int iscsit_reset_np_thread(
 411         struct iscsi_np *np,
 412         struct iscsi_tpg_np *tpg_np,
 413         struct iscsi_portal_group *tpg)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (tpg && tpg_np) {
 417                 /*
 418                  * The reset operation need only be performed when the
 419                  * passed struct iscsi_portal_group has a login in progress
 420                  * to one of the network portals.
 421                  */
 422                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 423                         spin_unlock_bh(&np->np_thread_lock);
 424                         return 0;
 425                 }
 426         }
 427         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 return 0;
 430         }
 431         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 432
 433         if (np->np_thread) {
 434                 spin_unlock_bh(&np->np_thread_lock);
 435                 send_sig(SIGINT, np->np_thread, 1);
 436                 wait_for_completion(&np->np_restart_comp);
 437                 spin_lock_bh(&np->np_thread_lock);
 438         }
 439         spin_unlock_bh(&np->np_thread_lock);
 440
 441         return 0;
 442 }
 443
 444 static void iscsit_free_np(struct iscsi_np *np)
 445 {
 446         if (np->np_socket)
 447                 sock_release(np->np_socket);
 448 }
 449
 450 int iscsit_del_np(struct iscsi_np *np)
 451 {
 452         spin_lock_bh(&np->np_thread_lock);
 453         np->np_exports--;
 454         if (np->np_exports) {
 455                 spin_unlock_bh(&np->np_thread_lock);
 456                 return 0;
 457         }
 458         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 459         spin_unlock_bh(&np->np_thread_lock);
 460
 461         if (np->np_thread) {
 462                 /*
 463                  * We need to send the signal to wakeup Linux/Net
 464                  * which may be sleeping in sock_accept()..
 465                  */
 466                 send_sig(SIGINT, np->np_thread, 1);
 467                 kthread_stop(np->np_thread);
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         spin_lock_bh(&np_lock);
 473         list_del(&np->np_list);
 474         spin_unlock_bh(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 477                 np->np_ip, np->np_port, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 486
 487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 488 {
 489         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 490         return 0;
 491 }
 492
 493 static struct iscsit_transport iscsi_target_transport = {
 494         .name                   = "iSCSI/TCP",
 495         .transport_type         = ISCSI_TCP,
 496         .owner                  = NULL,
 497         .iscsit_setup_np        = iscsit_setup_np,
 498         .iscsit_accept_np       = iscsit_accept_np,
 499         .iscsit_free_np         = iscsit_free_np,
 500         .iscsit_alloc_cmd       = iscsit_alloc_cmd,
 501         .iscsit_get_login_rx    = iscsit_get_login_rx,
 502         .iscsit_put_login_tx    = iscsit_put_login_tx,
 503         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 504         .iscsit_immediate_queue = iscsit_immediate_queue,
 505         .iscsit_response_queue  = iscsit_response_queue,
 506         .iscsit_queue_data_in   = iscsit_queue_rsp,
 507         .iscsit_queue_status    = iscsit_queue_rsp,
 508 };
 509
 510 static int __init iscsi_target_init_module(void)
 511 {
 512         int ret = 0;
 513
 514         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 515
 516         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 517         if (!iscsit_global) {
 518                 pr_err("Unable to allocate memory for iscsit_global\n");
 519                 return -1;
 520         }
 521         mutex_init(&auth_id_lock);
 522         spin_lock_init(&sess_idr_lock);
 523         idr_init(&tiqn_idr);
 524         idr_init(&sess_idr);
 525
 526         ret = iscsi_target_register_configfs();
 527         if (ret < 0)
 528                 goto out;
 529
 530         ret = iscsi_thread_set_init();
 531         if (ret < 0)
 532                 goto configfs_out;
 533
 534         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 535                         TARGET_THREAD_SET_COUNT) {
 536                 pr_err("iscsi_allocate_thread_sets() returned"
 537                         " unexpected value!\n");
 538                 goto ts_out1;
 539         }
 540
 541         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 542                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 543                         0, NULL);
 544         if (!lio_cmd_cache) {
 545                 pr_err("Unable to kmem_cache_create() for"
 546                                 " lio_cmd_cache\n");
 547                 goto ts_out2;
 548         }
 549
 550         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 551                         sizeof(struct iscsi_queue_req),
 552                         __alignof__(struct iscsi_queue_req), 0, NULL);
 553         if (!lio_qr_cache) {
 554                 pr_err("nable to kmem_cache_create() for"
 555                                 " lio_qr_cache\n");
 556                 goto cmd_out;
 557         }
 558
 559         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 560                         sizeof(struct iscsi_datain_req),
 561                         __alignof__(struct iscsi_datain_req), 0, NULL);
 562         if (!lio_dr_cache) {
 563                 pr_err("Unable to kmem_cache_create() for"
 564                                 " lio_dr_cache\n");
 565                 goto qr_out;
 566         }
 567
 568         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 569                         sizeof(struct iscsi_ooo_cmdsn),
 570                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 571         if (!lio_ooo_cache) {
 572                 pr_err("Unable to kmem_cache_create() for"
 573                                 " lio_ooo_cache\n");
 574                 goto dr_out;
 575         }
 576
 577         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 578                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 579                         0, NULL);
 580         if (!lio_r2t_cache) {
 581                 pr_err("Unable to kmem_cache_create() for"
 582                                 " lio_r2t_cache\n");
 583                 goto ooo_out;
 584         }
 585
 586         iscsit_register_transport(&iscsi_target_transport);
 587
 588         if (iscsit_load_discovery_tpg() < 0)
 589                 goto r2t_out;
 590
 591         return ret;
 592 r2t_out:
 593         kmem_cache_destroy(lio_r2t_cache);
 594 ooo_out:
 595         kmem_cache_destroy(lio_ooo_cache);
 596 dr_out:
 597         kmem_cache_destroy(lio_dr_cache);
 598 qr_out:
 599         kmem_cache_destroy(lio_qr_cache);
 600 cmd_out:
 601         kmem_cache_destroy(lio_cmd_cache);
 602 ts_out2:
 603         iscsi_deallocate_thread_sets();
 604 ts_out1:
 605         iscsi_thread_set_free();
 606 configfs_out:
 607         iscsi_target_deregister_configfs();
 608 out:
 609         kfree(iscsit_global);
 610         return -ENOMEM;
 611 }
 612
 613 static void __exit iscsi_target_cleanup_module(void)
 614 {
 615         iscsi_deallocate_thread_sets();
 616         iscsi_thread_set_free();
 617         iscsit_release_discovery_tpg();
 618         iscsit_unregister_transport(&iscsi_target_transport);
 619         kmem_cache_destroy(lio_cmd_cache);
 620         kmem_cache_destroy(lio_qr_cache);
 621         kmem_cache_destroy(lio_dr_cache);
 622         kmem_cache_destroy(lio_ooo_cache);
 623         kmem_cache_destroy(lio_r2t_cache);
 624
 625         iscsi_target_deregister_configfs();
 626
 627         kfree(iscsit_global);
 628 }
 629
 630 static int iscsit_add_reject(
 631         struct iscsi_conn *conn,
 632         u8 reason,
 633         unsigned char *buf)
 634 {
 635         struct iscsi_cmd *cmd;
 636
 637         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 638         if (!cmd)
 639                 return -1;
 640
 641         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 642         cmd->reject_reason = reason;
 643
 644         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 645         if (!cmd->buf_ptr) {
 646                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 647                 iscsit_free_cmd(cmd, false);
 648                 return -1;
 649         }
 650
 651         spin_lock_bh(&conn->cmd_lock);
 652         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 653         spin_unlock_bh(&conn->cmd_lock);
 654
 655         cmd->i_state = ISTATE_SEND_REJECT;
 656         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 657
 658         return -1;
 659 }
 660
 661 static int iscsit_add_reject_from_cmd(
 662         struct iscsi_cmd *cmd,
 663         u8 reason,
 664         bool add_to_conn,
 665         unsigned char *buf)
 666 {
 667         struct iscsi_conn *conn;
 668
 669         if (!cmd->conn) {
 670                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 671                                 cmd->init_task_tag);
 672                 return -1;
 673         }
 674         conn = cmd->conn;
 675
 676         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 677         cmd->reject_reason = reason;
 678
 679         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 680         if (!cmd->buf_ptr) {
 681                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 682                 iscsit_free_cmd(cmd, false);
 683                 return -1;
 684         }
 685
 686         if (add_to_conn) {
 687                 spin_lock_bh(&conn->cmd_lock);
 688                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 689                 spin_unlock_bh(&conn->cmd_lock);
 690         }
 691
 692         cmd->i_state = ISTATE_SEND_REJECT;
 693         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 694         /*
 695          * Perform the kref_put now if se_cmd has already been setup by
 696          * scsit_setup_scsi_cmd()
 697          */
 698         if (cmd->se_cmd.se_tfo != NULL) {
 699                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 700                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 701         }
 702         return -1;
 703 }
 704
 705 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 706                                  unsigned char *buf)
 707 {
 708         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 709 }
 710
 711 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 712 {
 713         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 714 }
 715
 716 /*
 717  * Map some portion of the allocated scatterlist to an iovec, suitable for
 718  * kernel sockets to copy data in/out.
 719  */
 720 static int iscsit_map_iovec(
 721         struct iscsi_cmd *cmd,
 722         struct kvec *iov,
 723         u32 data_offset,
 724         u32 data_length)
 725 {
 726         u32 i = 0;
 727         struct scatterlist *sg;
 728         unsigned int page_off;
 729
 730         /*
 731          * We know each entry in t_data_sg contains a page.
 732          */
 733         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 734         page_off = (data_offset % PAGE_SIZE);
 735
 736         cmd->first_data_sg = sg;
 737         cmd->first_data_sg_off = page_off;
 738
 739         while (data_length) {
 740                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 741
 742                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 743                 iov[i].iov_len = cur_len;
 744
 745                 data_length -= cur_len;
 746                 page_off = 0;
 747                 sg = sg_next(sg);
 748                 i++;
 749         }
 750
 751         cmd->kmapped_nents = i;
 752
 753         return i;
 754 }
 755
 756 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 757 {
 758         u32 i;
 759         struct scatterlist *sg;
 760
 761         sg = cmd->first_data_sg;
 762
 763         for (i = 0; i < cmd->kmapped_nents; i++)
 764                 kunmap(sg_page(&sg[i]));
 765 }
 766
 767 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 768 {
 769         struct iscsi_cmd *cmd;
 770
 771         conn->exp_statsn = exp_statsn;
 772
 773         if (conn->sess->sess_ops->RDMAExtensions)
 774                 return;
 775
 776         spin_lock_bh(&conn->cmd_lock);
 777         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 778                 spin_lock(&cmd->istate_lock);
 779                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 780                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 781                         cmd->i_state = ISTATE_REMOVE;
 782                         spin_unlock(&cmd->istate_lock);
 783                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 784                                                 cmd->i_state);
 785                         continue;
 786                 }
 787                 spin_unlock(&cmd->istate_lock);
 788         }
 789         spin_unlock_bh(&conn->cmd_lock);
 790 }
 791
 792 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 793 {
 794         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 795
 796         iov_count += ISCSI_IOV_DATA_BUFFER;
 797
 798         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 799         if (!cmd->iov_data) {
 800                 pr_err("Unable to allocate cmd->iov_data\n");
 801                 return -ENOMEM;
 802         }
 803
 804         cmd->orig_iov_data_count = iov_count;
 805         return 0;
 806 }
 807
 808 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 809                           unsigned char *buf)
 810 {
 811         int data_direction, payload_length;
 812         struct iscsi_scsi_req *hdr;
 813         int iscsi_task_attr;
 814         int sam_task_attr;
 815
 816         spin_lock_bh(&conn->sess->session_stats_lock);
 817         conn->sess->cmd_pdus++;
 818         if (conn->sess->se_sess->se_node_acl) {
 819                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 820                 conn->sess->se_sess->se_node_acl->num_cmds++;
 821                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 822         }
 823         spin_unlock_bh(&conn->sess->session_stats_lock);
 824
 825         hdr                     = (struct iscsi_scsi_req *) buf;
 826         payload_length          = ntoh24(hdr->dlength);
 827
 828         /* FIXME; Add checks for AdditionalHeaderSegment */
 829
 830         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 831             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 832                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 833                                 " not set. Bad iSCSI Initiator.\n");
 834                 return iscsit_add_reject_cmd(cmd,
 835                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 836         }
 837
 838         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 839              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 840                 /*
 841                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 842                  * that adds support for RESERVE/RELEASE.  There is a bug
 843                  * add with this new functionality that sets R/W bits when
 844                  * neither CDB carries any READ or WRITE datapayloads.
 845                  */
 846                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 847                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 848                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 849                         goto done;
 850                 }
 851
 852                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 853                         " set when Expected Data Transfer Length is 0 for"
 854                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 855                 return iscsit_add_reject_cmd(cmd,
 856                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 857         }
 858 done:
 859
 860         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 861             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 862                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 863                         " MUST be set if Expected Data Transfer Length is not 0."
 864                         " Bad iSCSI Initiator\n");
 865                 return iscsit_add_reject_cmd(cmd,
 866                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 867         }
 868
 869         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 870             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 871                 pr_err("Bidirectional operations not supported!\n");
 872                 return iscsit_add_reject_cmd(cmd,
 873                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 874         }
 875
 876         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 877                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 878                                 " Scsi Command PDU.\n");
 879                 return iscsit_add_reject_cmd(cmd,
 880                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 881         }
 882
 883         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 884                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 885                         " protocol error.\n", payload_length);
 886                 return iscsit_add_reject_cmd(cmd,
 887                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 888         }
 889
 890         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 891             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 892                 pr_err("Expected Data Transfer Length and Length of"
 893                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 894                         " bit is not set protocol error\n");
 895                 return iscsit_add_reject_cmd(cmd,
 896                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 897         }
 898
 899         if (payload_length > be32_to_cpu(hdr->data_length)) {
 900                 pr_err("DataSegmentLength: %u is greater than"
 901                         " EDTL: %u, protocol error.\n", payload_length,
 902                                 hdr->data_length);
 903                 return iscsit_add_reject_cmd(cmd,
 904                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 905         }
 906
 907         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 908                 pr_err("DataSegmentLength: %u is greater than"
 909                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 910                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 911                 return iscsit_add_reject_cmd(cmd,
 912                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 913         }
 914
 915         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 916                 pr_err("DataSegmentLength: %u is greater than"
 917                         " FirstBurstLength: %u, protocol error.\n",
 918                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 919                 return iscsit_add_reject_cmd(cmd,
 920                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 921         }
 922
 923         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 924                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 925                           DMA_NONE;
 926
 927         cmd->data_direction = data_direction;
 928         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 929         /*
 930          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 931          */
 932         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 933             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 934                 sam_task_attr = MSG_SIMPLE_TAG;
 935         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 936                 sam_task_attr = MSG_ORDERED_TAG;
 937         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 938                 sam_task_attr = MSG_HEAD_TAG;
 939         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 940                 sam_task_attr = MSG_ACA_TAG;
 941         else {
 942                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 943                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 944                 sam_task_attr = MSG_SIMPLE_TAG;
 945         }
 946
 947         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 948         cmd->i_state            = ISTATE_NEW_CMD;
 949         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 950         cmd->immediate_data     = (payload_length) ? 1 : 0;
 951         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 952                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 953         if (cmd->unsolicited_data)
 954                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 955
 956         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 957         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 958                 spin_lock_bh(&conn->sess->ttt_lock);
 959                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 960                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 961                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 962                 spin_unlock_bh(&conn->sess->ttt_lock);
 963         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 964                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 965         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 966         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 967         cmd->first_burst_len    = payload_length;
 968
 969         if (!conn->sess->sess_ops->RDMAExtensions &&
 970              cmd->data_direction == DMA_FROM_DEVICE) {
 971                 struct iscsi_datain_req *dr;
 972
 973                 dr = iscsit_allocate_datain_req();
 974                 if (!dr)
 975                         return iscsit_add_reject_cmd(cmd,
 976                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 977
 978                 iscsit_attach_datain_req(cmd, dr);
 979         }
 980
 981         /*
 982          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 983          */
 984         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 985                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 986                         cmd->data_direction, sam_task_attr,
 987                         cmd->sense_buffer + 2);
 988
 989         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 990                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 991                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
 992                 conn->cid);
 993
 994         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
 995
 996         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 997                                                      scsilun_to_int(&hdr->lun));
 998         if (cmd->sense_reason)
 999                 goto attach_cmd;
1000
1001         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1002         if (cmd->sense_reason) {
1003                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1004                         return iscsit_add_reject_cmd(cmd,
1005                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1006                 }
1007
1008                 goto attach_cmd;
1009         }
1010
1011         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1012                 return iscsit_add_reject_cmd(cmd,
1013                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1014         }
1015
1016 attach_cmd:
1017         spin_lock_bh(&conn->cmd_lock);
1018         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1019         spin_unlock_bh(&conn->cmd_lock);
1020         /*
1021          * Check if we need to delay processing because of ALUA
1022          * Active/NonOptimized primary access state..
1023          */
1024         core_alua_check_nonop_delay(&cmd->se_cmd);
1025
1026         return 0;
1027 }
1028 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1029
1030 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1031 {
1032         iscsit_set_dataout_sequence_values(cmd);
1033
1034         spin_lock_bh(&cmd->dataout_timeout_lock);
1035         iscsit_start_dataout_timer(cmd, cmd->conn);
1036         spin_unlock_bh(&cmd->dataout_timeout_lock);
1037 }
1038 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1039
1040 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1041                             struct iscsi_scsi_req *hdr)
1042 {
1043         int cmdsn_ret = 0;
1044         /*
1045          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1046          * the Immediate Bit is not set, and no Immediate
1047          * Data is attached.
1048          *
1049          * A PDU/CmdSN carrying Immediate Data can only
1050          * be processed after the DataCRC has passed.
1051          * If the DataCRC fails, the CmdSN MUST NOT
1052          * be acknowledged. (See below)
1053          */
1054         if (!cmd->immediate_data) {
1055                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1056                                         (unsigned char *)hdr, hdr->cmdsn);
1057                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1058                         return -1;
1059                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1060                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1061                         return 0;
1062                 }
1063         }
1064
1065         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1066
1067         /*
1068          * If no Immediate Data is attached, it's OK to return now.
1069          */
1070         if (!cmd->immediate_data) {
1071                 if (!cmd->sense_reason && cmd->unsolicited_data)
1072                         iscsit_set_unsoliticed_dataout(cmd);
1073                 if (!cmd->sense_reason)
1074                         return 0;
1075
1076                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1077                 return 0;
1078         }
1079
1080         /*
1081          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1082          * execution.  These exceptions are processed in CmdSN order using
1083          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1084          */
1085         if (cmd->sense_reason) {
1086                 if (cmd->reject_reason)
1087                         return 0;
1088
1089                 return 1;
1090         }
1091         /*
1092          * Call directly into transport_generic_new_cmd() to perform
1093          * the backend memory allocation.
1094          */
1095         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1096         if (cmd->sense_reason)
1097                 return 1;
1098
1099         return 0;
1100 }
1101 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1102
1103 static int
1104 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1105                           bool dump_payload)
1106 {
1107         struct iscsi_conn *conn = cmd->conn;
1108         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1109         /*
1110          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1111          */
1112         if (dump_payload == true)
1113                 goto after_immediate_data;
1114
1115         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1116                                         cmd->first_burst_len);
1117 after_immediate_data:
1118         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1119                 /*
1120                  * A PDU/CmdSN carrying Immediate Data passed
1121                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1122                  * Immediate Bit is not set.
1123                  */
1124                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1125                                         (unsigned char *)hdr, hdr->cmdsn);
1126                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1127                         return -1;
1128
1129                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1130                         int rc;
1131
1132                         rc = iscsit_dump_data_payload(cmd->conn,
1133                                                       cmd->first_burst_len, 1);
1134                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1135                         return rc;
1136                 } else if (cmd->unsolicited_data)
1137                         iscsit_set_unsoliticed_dataout(cmd);
1138
1139         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1140                 /*
1141                  * Immediate Data failed DataCRC and ERL>=1,
1142                  * silently drop this PDU and let the initiator
1143                  * plug the CmdSN gap.
1144                  *
1145                  * FIXME: Send Unsolicited NOPIN with reserved
1146                  * TTT here to help the initiator figure out
1147                  * the missing CmdSN, although they should be
1148                  * intelligent enough to determine the missing
1149                  * CmdSN and issue a retry to plug the sequence.
1150                  */
1151                 cmd->i_state = ISTATE_REMOVE;
1152                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1153         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1154                 return -1;
1155
1156         return 0;
1157 }
1158
1159 static int
1160 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1161                            unsigned char *buf)
1162 {
1163         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1164         int rc, immed_data;
1165         bool dump_payload = false;
1166
1167         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1168         if (rc < 0)
1169                 return 0;
1170         /*
1171          * Allocation iovecs needed for struct socket operations for
1172          * traditional iSCSI block I/O.
1173          */
1174         if (iscsit_allocate_iovecs(cmd) < 0) {
1175                 return iscsit_add_reject_cmd(cmd,
1176                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1177         }
1178         immed_data = cmd->immediate_data;
1179
1180         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1181         if (rc < 0)
1182                 return rc;
1183         else if (rc > 0)
1184                 dump_payload = true;
1185
1186         if (!immed_data)
1187                 return 0;
1188
1189         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1190 }
1191
1192 static u32 iscsit_do_crypto_hash_sg(
1193         struct hash_desc *hash,
1194         struct iscsi_cmd *cmd,
1195         u32 data_offset,
1196         u32 data_length,
1197         u32 padding,
1198         u8 *pad_bytes)
1199 {
1200         u32 data_crc;
1201         u32 i;
1202         struct scatterlist *sg;
1203         unsigned int page_off;
1204
1205         crypto_hash_init(hash);
1206
1207         sg = cmd->first_data_sg;
1208         page_off = cmd->first_data_sg_off;
1209
1210         i = 0;
1211         while (data_length) {
1212                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1213
1214                 crypto_hash_update(hash, &sg[i], cur_len);
1215
1216                 data_length -= cur_len;
1217                 page_off = 0;
1218                 i++;
1219         }
1220
1221         if (padding) {
1222                 struct scatterlist pad_sg;
1223
1224                 sg_init_one(&pad_sg, pad_bytes, padding);
1225                 crypto_hash_update(hash, &pad_sg, padding);
1226         }
1227         crypto_hash_final(hash, (u8 *) &data_crc);
1228
1229         return data_crc;
1230 }
1231
1232 static void iscsit_do_crypto_hash_buf(
1233         struct hash_desc *hash,
1234         const void *buf,
1235         u32 payload_length,
1236         u32 padding,
1237         u8 *pad_bytes,
1238         u8 *data_crc)
1239 {
1240         struct scatterlist sg;
1241
1242         crypto_hash_init(hash);
1243
1244         sg_init_one(&sg, buf, payload_length);
1245         crypto_hash_update(hash, &sg, payload_length);
1246
1247         if (padding) {
1248                 sg_init_one(&sg, pad_bytes, padding);
1249                 crypto_hash_update(hash, &sg, padding);
1250         }
1251         crypto_hash_final(hash, data_crc);
1252 }
1253
1254 int
1255 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1256                           struct iscsi_cmd **out_cmd)
1257 {
1258         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1259         struct iscsi_cmd *cmd = NULL;
1260         struct se_cmd *se_cmd;
1261         u32 payload_length = ntoh24(hdr->dlength);
1262         int rc;
1263
1264         if (!payload_length) {
1265                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1266                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1267                                          buf);
1268         }
1269
1270         /* iSCSI write */
1271         spin_lock_bh(&conn->sess->session_stats_lock);
1272         conn->sess->rx_data_octets += payload_length;
1273         if (conn->sess->se_sess->se_node_acl) {
1274                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1275                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1276                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1277         }
1278         spin_unlock_bh(&conn->sess->session_stats_lock);
1279
1280         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1281                 pr_err("DataSegmentLength: %u is greater than"
1282                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1283                         conn->conn_ops->MaxXmitDataSegmentLength);
1284                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1285                                          buf);
1286         }
1287
1288         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1289                         payload_length);
1290         if (!cmd)
1291                 return 0;
1292
1293         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1294                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1295                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1296                 payload_length, conn->cid);
1297
1298         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1299                 pr_err("Command ITT: 0x%08x received DataOUT after"
1300                         " last DataOUT received, dumping payload\n",
1301                         cmd->init_task_tag);
1302                 return iscsit_dump_data_payload(conn, payload_length, 1);
1303         }
1304
1305         if (cmd->data_direction != DMA_TO_DEVICE) {
1306                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1307                         " NON-WRITE command.\n", cmd->init_task_tag);
1308                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1309         }
1310         se_cmd = &cmd->se_cmd;
1311         iscsit_mod_dataout_timer(cmd);
1312
1313         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1314                 pr_err("DataOut Offset: %u, Length %u greater than"
1315                         " iSCSI Command EDTL %u, protocol error.\n",
1316                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1317                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1318         }
1319
1320         if (cmd->unsolicited_data) {
1321                 int dump_unsolicited_data = 0;
1322
1323                 if (conn->sess->sess_ops->InitialR2T) {
1324                         pr_err("Received unexpected unsolicited data"
1325                                 " while InitialR2T=Yes, protocol error.\n");
1326                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1327                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1328                         return -1;
1329                 }
1330                 /*
1331                  * Special case for dealing with Unsolicited DataOUT
1332                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1333                  * failures;
1334                  */
1335
1336                 /* Something's amiss if we're not in WRITE_PENDING state... */
1337                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1338                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1339                         dump_unsolicited_data = 1;
1340
1341                 if (dump_unsolicited_data) {
1342                         /*
1343                          * Check if a delayed TASK_ABORTED status needs to
1344                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1345                          * received with the unsolicitied data out.
1346                          */
1347                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1348                                 iscsit_stop_dataout_timer(cmd);
1349
1350                         transport_check_aborted_status(se_cmd,
1351                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1352                         return iscsit_dump_data_payload(conn, payload_length, 1);
1353                 }
1354         } else {
1355                 /*
1356                  * For the normal solicited data path:
1357                  *
1358                  * Check for a delayed TASK_ABORTED status and dump any
1359                  * incoming data out payload if one exists.  Also, when the
1360                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1361                  * data out sequence, we decrement outstanding_r2ts.  Once
1362                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1363                  * TASK_ABORTED status.
1364                  */
1365                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1366                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1367                                 if (--cmd->outstanding_r2ts < 1) {
1368                                         iscsit_stop_dataout_timer(cmd);
1369                                         transport_check_aborted_status(
1370                                                         se_cmd, 1);
1371                                 }
1372
1373                         return iscsit_dump_data_payload(conn, payload_length, 1);
1374                 }
1375         }
1376         /*
1377          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1378          * within-command recovery checks before receiving the payload.
1379          */
1380         rc = iscsit_check_pre_dataout(cmd, buf);
1381         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1382                 return 0;
1383         else if (rc == DATAOUT_CANNOT_RECOVER)
1384                 return -1;
1385
1386         *out_cmd = cmd;
1387         return 0;
1388 }
1389 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1390
1391 static int
1392 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1393                    struct iscsi_data *hdr)
1394 {
1395         struct kvec *iov;
1396         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1397         u32 payload_length = ntoh24(hdr->dlength);
1398         int iov_ret, data_crc_failed = 0;
1399
1400         rx_size += payload_length;
1401         iov = &cmd->iov_data[0];
1402
1403         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1404                                    payload_length);
1405         if (iov_ret < 0)
1406                 return -1;
1407
1408         iov_count += iov_ret;
1409
1410         padding = ((-payload_length) & 3);
1411         if (padding != 0) {
1412                 iov[iov_count].iov_base = cmd->pad_bytes;
1413                 iov[iov_count++].iov_len = padding;
1414                 rx_size += padding;
1415                 pr_debug("Receiving %u padding bytes.\n", padding);
1416         }
1417
1418         if (conn->conn_ops->DataDigest) {
1419                 iov[iov_count].iov_base = &checksum;
1420                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1421                 rx_size += ISCSI_CRC_LEN;
1422         }
1423
1424         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1425
1426         iscsit_unmap_iovec(cmd);
1427
1428         if (rx_got != rx_size)
1429                 return -1;
1430
1431         if (conn->conn_ops->DataDigest) {
1432                 u32 data_crc;
1433
1434                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1435                                                     be32_to_cpu(hdr->offset),
1436                                                     payload_length, padding,
1437                                                     cmd->pad_bytes);
1438
1439                 if (checksum != data_crc) {
1440                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1441                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1442                                 " does not match computed 0x%08x\n",
1443                                 hdr->itt, hdr->offset, payload_length,
1444                                 hdr->datasn, checksum, data_crc);
1445                         data_crc_failed = 1;
1446                 } else {
1447                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1448                                 " %u bytes of Data Out\n", checksum,
1449                                 payload_length);
1450                 }
1451         }
1452
1453         return data_crc_failed;
1454 }
1455
1456 int
1457 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1458                              bool data_crc_failed)
1459 {
1460         struct iscsi_conn *conn = cmd->conn;
1461         int rc, ooo_cmdsn;
1462         /*
1463          * Increment post receive data and CRC values or perform
1464          * within-command recovery.
1465          */
1466         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1467         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1468                 return 0;
1469         else if (rc == DATAOUT_SEND_R2T) {
1470                 iscsit_set_dataout_sequence_values(cmd);
1471                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1472         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1473                 /*
1474                  * Handle extra special case for out of order
1475                  * Unsolicited Data Out.
1476                  */
1477                 spin_lock_bh(&cmd->istate_lock);
1478                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1479                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1480                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1481                 spin_unlock_bh(&cmd->istate_lock);
1482
1483                 iscsit_stop_dataout_timer(cmd);
1484                 if (ooo_cmdsn)
1485                         return 0;
1486                 target_execute_cmd(&cmd->se_cmd);
1487                 return 0;
1488         } else /* DATAOUT_CANNOT_RECOVER */
1489                 return -1;
1490
1491         return 0;
1492 }
1493 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1494
1495 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1496 {
1497         struct iscsi_cmd *cmd;
1498         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1499         int rc;
1500         bool data_crc_failed = false;
1501
1502         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1503         if (rc < 0)
1504                 return 0;
1505         else if (!cmd)
1506                 return 0;
1507
1508         rc = iscsit_get_dataout(conn, cmd, hdr);
1509         if (rc < 0)
1510                 return rc;
1511         else if (rc > 0)
1512                 data_crc_failed = true;
1513
1514         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1515 }
1516
1517 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1518                          struct iscsi_nopout *hdr)
1519 {
1520         u32 payload_length = ntoh24(hdr->dlength);
1521
1522         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1523                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1524                         " not set, protocol error.\n");
1525                 if (!cmd)
1526                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1527                                                  (unsigned char *)hdr);
1528
1529                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1530                                          (unsigned char *)hdr);
1531         }
1532
1533         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1534                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1535                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1536                         " error.\n", payload_length,
1537                         conn->conn_ops->MaxXmitDataSegmentLength);
1538                 if (!cmd)
1539                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540                                                  (unsigned char *)hdr);
1541
1542                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543                                          (unsigned char *)hdr);
1544         }
1545
1546         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1547                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1548                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1549                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1550                 payload_length);
1551         /*
1552          * This is not a response to a Unsolicited NopIN, which means
1553          * it can either be a NOPOUT ping request (with a valid ITT),
1554          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1555          * Either way, make sure we allocate an struct iscsi_cmd, as both
1556          * can contain ping data.
1557          */
1558         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1559                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1560                 cmd->i_state            = ISTATE_SEND_NOPIN;
1561                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1562                                                 1 : 0);
1563                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1564                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1565                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1566                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1567                 cmd->data_direction     = DMA_NONE;
1568         }
1569
1570         return 0;
1571 }
1572 EXPORT_SYMBOL(iscsit_setup_nop_out);
1573
1574 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1575                            struct iscsi_nopout *hdr)
1576 {
1577         struct iscsi_cmd *cmd_p = NULL;
1578         int cmdsn_ret = 0;
1579         /*
1580          * Initiator is expecting a NopIN ping reply..
1581          */
1582         if (hdr->itt != RESERVED_ITT) {
1583                 BUG_ON(!cmd);
1584
1585                 spin_lock_bh(&conn->cmd_lock);
1586                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1587                 spin_unlock_bh(&conn->cmd_lock);
1588
1589                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1590
1591                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1592                         iscsit_add_cmd_to_response_queue(cmd, conn,
1593                                                          cmd->i_state);
1594                         return 0;
1595                 }
1596
1597                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1598                                 (unsigned char *)hdr, hdr->cmdsn);
1599                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1600                         return 0;
1601                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1602                         return -1;
1603
1604                 return 0;
1605         }
1606         /*
1607          * This was a response to a unsolicited NOPIN ping.
1608          */
1609         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1610                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1611                 if (!cmd_p)
1612                         return -EINVAL;
1613
1614                 iscsit_stop_nopin_response_timer(conn);
1615
1616                 cmd_p->i_state = ISTATE_REMOVE;
1617                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1618
1619                 iscsit_start_nopin_timer(conn);
1620                 return 0;
1621         }
1622         /*
1623          * Otherwise, initiator is not expecting a NOPIN is response.
1624          * Just ignore for now.
1625          */
1626         return 0;
1627 }
1628 EXPORT_SYMBOL(iscsit_process_nop_out);
1629
1630 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1631                                  unsigned char *buf)
1632 {
1633         unsigned char *ping_data = NULL;
1634         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1635         struct kvec *iov = NULL;
1636         u32 payload_length = ntoh24(hdr->dlength);
1637         int ret;
1638
1639         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1640         if (ret < 0)
1641                 return 0;
1642         /*
1643          * Handle NOP-OUT payload for traditional iSCSI sockets
1644          */
1645         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1646                 u32 checksum, data_crc, padding = 0;
1647                 int niov = 0, rx_got, rx_size = payload_length;
1648
1649                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1650                 if (!ping_data) {
1651                         pr_err("Unable to allocate memory for"
1652                                 " NOPOUT ping data.\n");
1653                         ret = -1;
1654                         goto out;
1655                 }
1656
1657                 iov = &cmd->iov_misc[0];
1658                 iov[niov].iov_base      = ping_data;
1659                 iov[niov++].iov_len     = payload_length;
1660
1661                 padding = ((-payload_length) & 3);
1662                 if (padding != 0) {
1663                         pr_debug("Receiving %u additional bytes"
1664                                 " for padding.\n", padding);
1665                         iov[niov].iov_base      = &cmd->pad_bytes;
1666                         iov[niov++].iov_len     = padding;
1667                         rx_size += padding;
1668                 }
1669                 if (conn->conn_ops->DataDigest) {
1670                         iov[niov].iov_base      = &checksum;
1671                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1672                         rx_size += ISCSI_CRC_LEN;
1673                 }
1674
1675                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1676                 if (rx_got != rx_size) {
1677                         ret = -1;
1678                         goto out;
1679                 }
1680
1681                 if (conn->conn_ops->DataDigest) {
1682                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1683                                         ping_data, payload_length,
1684                                         padding, cmd->pad_bytes,
1685                                         (u8 *)&data_crc);
1686
1687                         if (checksum != data_crc) {
1688                                 pr_err("Ping data CRC32C DataDigest"
1689                                 " 0x%08x does not match computed 0x%08x\n",
1690                                         checksum, data_crc);
1691                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1692                                         pr_err("Unable to recover from"
1693                                         " NOPOUT Ping DataCRC failure while in"
1694                                                 " ERL=0.\n");
1695                                         ret = -1;
1696                                         goto out;
1697                                 } else {
1698                                         /*
1699                                          * Silently drop this PDU and let the
1700                                          * initiator plug the CmdSN gap.
1701                                          */
1702                                         pr_debug("Dropping NOPOUT"
1703                                         " Command CmdSN: 0x%08x due to"
1704                                         " DataCRC error.\n", hdr->cmdsn);
1705                                         ret = 0;
1706                                         goto out;
1707                                 }
1708                         } else {
1709                                 pr_debug("Got CRC32C DataDigest"
1710                                 " 0x%08x for %u bytes of ping data.\n",
1711                                         checksum, payload_length);
1712                         }
1713                 }
1714
1715                 ping_data[payload_length] = '\0';
1716                 /*
1717                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1718                  */
1719                 cmd->buf_ptr = ping_data;
1720                 cmd->buf_ptr_size = payload_length;
1721
1722                 pr_debug("Got %u bytes of NOPOUT ping"
1723                         " data.\n", payload_length);
1724                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1725         }
1726
1727         return iscsit_process_nop_out(conn, cmd, hdr);
1728 out:
1729         if (cmd)
1730                 iscsit_free_cmd(cmd, false);
1731
1732         kfree(ping_data);
1733         return ret;
1734 }
1735
1736 int
1737 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1738                            unsigned char *buf)
1739 {
1740         struct se_tmr_req *se_tmr;
1741         struct iscsi_tmr_req *tmr_req;
1742         struct iscsi_tm *hdr;
1743         int out_of_order_cmdsn = 0, ret;
1744         bool sess_ref = false;
1745         u8 function;
1746
1747         hdr                     = (struct iscsi_tm *) buf;
1748         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1749         function = hdr->flags;
1750
1751         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1752                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1753                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1754                 hdr->rtt, hdr->refcmdsn, conn->cid);
1755
1756         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1757             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1758              hdr->rtt != RESERVED_ITT)) {
1759                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1760                 hdr->rtt = RESERVED_ITT;
1761         }
1762
1763         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1764                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1765                 pr_err("Task Management Request TASK_REASSIGN not"
1766                         " issued as immediate command, bad iSCSI Initiator"
1767                                 "implementation\n");
1768                 return iscsit_add_reject_cmd(cmd,
1769                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1770         }
1771         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1773                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1774
1775         cmd->data_direction = DMA_NONE;
1776
1777         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1778         if (!cmd->tmr_req) {
1779                 pr_err("Unable to allocate memory for"
1780                         " Task Management command!\n");
1781                 return iscsit_add_reject_cmd(cmd,
1782                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1783                                              buf);
1784         }
1785
1786         /*
1787          * TASK_REASSIGN for ERL=2 / connection stays inside of
1788          * LIO-Target $FABRIC_MOD
1789          */
1790         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1791
1792                 u8 tcm_function;
1793                 int ret;
1794
1795                 transport_init_se_cmd(&cmd->se_cmd,
1796                                       &lio_target_fabric_configfs->tf_ops,
1797                                       conn->sess->se_sess, 0, DMA_NONE,
1798                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1799
1800                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1801                 sess_ref = true;
1802
1803                 switch (function) {
1804                 case ISCSI_TM_FUNC_ABORT_TASK:
1805                         tcm_function = TMR_ABORT_TASK;
1806                         break;
1807                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1808                         tcm_function = TMR_ABORT_TASK_SET;
1809                         break;
1810                 case ISCSI_TM_FUNC_CLEAR_ACA:
1811                         tcm_function = TMR_CLEAR_ACA;
1812                         break;
1813                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1814                         tcm_function = TMR_CLEAR_TASK_SET;
1815                         break;
1816                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1817                         tcm_function = TMR_LUN_RESET;
1818                         break;
1819                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1820                         tcm_function = TMR_TARGET_WARM_RESET;
1821                         break;
1822                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1823                         tcm_function = TMR_TARGET_COLD_RESET;
1824                         break;
1825                 default:
1826                         pr_err("Unknown iSCSI TMR Function:"
1827                                " 0x%02x\n", function);
1828                         return iscsit_add_reject_cmd(cmd,
1829                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1830                 }
1831
1832                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1833                                          tcm_function, GFP_KERNEL);
1834                 if (ret < 0)
1835                         return iscsit_add_reject_cmd(cmd,
1836                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1837
1838                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1839         }
1840
1841         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1842         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1843         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1844         cmd->init_task_tag      = hdr->itt;
1845         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1846         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1847         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1848         se_tmr                  = cmd->se_cmd.se_tmr_req;
1849         tmr_req                 = cmd->tmr_req;
1850         /*
1851          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1852          */
1853         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1854                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1855                                                scsilun_to_int(&hdr->lun));
1856                 if (ret < 0) {
1857                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1858                         goto attach;
1859                 }
1860         }
1861
1862         switch (function) {
1863         case ISCSI_TM_FUNC_ABORT_TASK:
1864                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1865                 if (se_tmr->response)
1866                         goto attach;
1867                 break;
1868         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1869         case ISCSI_TM_FUNC_CLEAR_ACA:
1870         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1871         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1872                 break;
1873         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1874                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1875                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1876                         goto attach;
1877                 }
1878                 break;
1879         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1880                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1881                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1882                         goto attach;
1883                 }
1884                 break;
1885         case ISCSI_TM_FUNC_TASK_REASSIGN:
1886                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1887                 /*
1888                  * Perform sanity checks on the ExpDataSN only if the
1889                  * TASK_REASSIGN was successful.
1890                  */
1891                 if (se_tmr->response)
1892                         break;
1893
1894                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1895                         return iscsit_add_reject_cmd(cmd,
1896                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1897                 break;
1898         default:
1899                 pr_err("Unknown TMR function: 0x%02x, protocol"
1900                         " error.\n", function);
1901                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1902                 goto attach;
1903         }
1904
1905         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1906             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1907                 se_tmr->call_transport = 1;
1908 attach:
1909         spin_lock_bh(&conn->cmd_lock);
1910         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1911         spin_unlock_bh(&conn->cmd_lock);
1912
1913         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1914                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1915                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1916                         out_of_order_cmdsn = 1;
1917                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1918                         return 0;
1919                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1920                         return -1;
1921         }
1922         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1923
1924         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1925                 return 0;
1926         /*
1927          * Found the referenced task, send to transport for processing.
1928          */
1929         if (se_tmr->call_transport)
1930                 return transport_generic_handle_tmr(&cmd->se_cmd);
1931
1932         /*
1933          * Could not find the referenced LUN, task, or Task Management
1934          * command not authorized or supported.  Change state and
1935          * let the tx_thread send the response.
1936          *
1937          * For connection recovery, this is also the default action for
1938          * TMR TASK_REASSIGN.
1939          */
1940         if (sess_ref) {
1941                 pr_debug("Handle TMR, using sess_ref=true check\n");
1942                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1943         }
1944
1945         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1946         return 0;
1947 }
1948 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1949
1950 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1951 int
1952 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1953                       struct iscsi_text *hdr)
1954 {
1955         u32 payload_length = ntoh24(hdr->dlength);
1956
1957         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1958                 pr_err("Unable to accept text parameter length: %u"
1959                         "greater than MaxXmitDataSegmentLength %u.\n",
1960                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1961                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1962                                          (unsigned char *)hdr);
1963         }
1964
1965         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1966                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1967                 hdr->exp_statsn, payload_length);
1968
1969         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1970         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1971         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1972         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1973         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1974         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1975         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1976         cmd->data_direction     = DMA_NONE;
1977
1978         return 0;
1979 }
1980 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1981
1982 int
1983 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1984                         struct iscsi_text *hdr)
1985 {
1986         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1987         int cmdsn_ret;
1988
1989         if (!text_in) {
1990                 pr_err("Unable to locate text_in buffer for sendtargets"
1991                        " discovery\n");
1992                 goto reject;
1993         }
1994         if (strncmp("SendTargets", text_in, 11) != 0) {
1995                 pr_err("Received Text Data that is not"
1996                         " SendTargets, cannot continue.\n");
1997                 goto reject;
1998         }
1999         text_ptr = strchr(text_in, '=');
2000         if (!text_ptr) {
2001                 pr_err("No \"=\" separator found in Text Data,"
2002                         "  cannot continue.\n");
2003                 goto reject;
2004         }
2005         if (!strncmp("=All", text_ptr, 4)) {
2006                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2007         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2008                    !strncmp("=eui.", text_ptr, 5)) {
2009                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2010         } else {
2011                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2012                 goto reject;
2013         }
2014
2015         spin_lock_bh(&conn->cmd_lock);
2016         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2017         spin_unlock_bh(&conn->cmd_lock);
2018
2019         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2020
2021         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2022                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2023                                 (unsigned char *)hdr, hdr->cmdsn);
2024                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2025                         return -1;
2026
2027                 return 0;
2028         }
2029
2030         return iscsit_execute_cmd(cmd, 0);
2031
2032 reject:
2033         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2034                                  (unsigned char *)hdr);
2035 }
2036 EXPORT_SYMBOL(iscsit_process_text_cmd);
2037
2038 static int
2039 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2040                        unsigned char *buf)
2041 {
2042         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2043         char *text_in = NULL;
2044         u32 payload_length = ntoh24(hdr->dlength);
2045         int rx_size, rc;
2046
2047         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2048         if (rc < 0)
2049                 return 0;
2050
2051         rx_size = payload_length;
2052         if (payload_length) {
2053                 u32 checksum = 0, data_crc = 0;
2054                 u32 padding = 0, pad_bytes = 0;
2055                 int niov = 0, rx_got;
2056                 struct kvec iov[3];
2057
2058                 text_in = kzalloc(payload_length, GFP_KERNEL);
2059                 if (!text_in) {
2060                         pr_err("Unable to allocate memory for"
2061                                 " incoming text parameters\n");
2062                         goto reject;
2063                 }
2064                 cmd->text_in_ptr = text_in;
2065
2066                 memset(iov, 0, 3 * sizeof(struct kvec));
2067                 iov[niov].iov_base      = text_in;
2068                 iov[niov++].iov_len     = payload_length;
2069
2070                 padding = ((-payload_length) & 3);
2071                 if (padding != 0) {
2072                         iov[niov].iov_base = &pad_bytes;
2073                         iov[niov++].iov_len  = padding;
2074                         rx_size += padding;
2075                         pr_debug("Receiving %u additional bytes"
2076                                         " for padding.\n", padding);
2077                 }
2078                 if (conn->conn_ops->DataDigest) {
2079                         iov[niov].iov_base      = &checksum;
2080                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2081                         rx_size += ISCSI_CRC_LEN;
2082                 }
2083
2084                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2085                 if (rx_got != rx_size)
2086                         goto reject;
2087
2088                 if (conn->conn_ops->DataDigest) {
2089                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2090                                         text_in, payload_length,
2091                                         padding, (u8 *)&pad_bytes,
2092                                         (u8 *)&data_crc);
2093
2094                         if (checksum != data_crc) {
2095                                 pr_err("Text data CRC32C DataDigest"
2096                                         " 0x%08x does not match computed"
2097                                         " 0x%08x\n", checksum, data_crc);
2098                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2099                                         pr_err("Unable to recover from"
2100                                         " Text Data digest failure while in"
2101                                                 " ERL=0.\n");
2102                                         goto reject;
2103                                 } else {
2104                                         /*
2105                                          * Silently drop this PDU and let the
2106                                          * initiator plug the CmdSN gap.
2107                                          */
2108                                         pr_debug("Dropping Text"
2109                                         " Command CmdSN: 0x%08x due to"
2110                                         " DataCRC error.\n", hdr->cmdsn);
2111                                         kfree(text_in);
2112                                         return 0;
2113                                 }
2114                         } else {
2115                                 pr_debug("Got CRC32C DataDigest"
2116                                         " 0x%08x for %u bytes of text data.\n",
2117                                                 checksum, payload_length);
2118                         }
2119                 }
2120                 text_in[payload_length - 1] = '\0';
2121                 pr_debug("Successfully read %d bytes of text"
2122                                 " data.\n", payload_length);
2123         }
2124
2125         return iscsit_process_text_cmd(conn, cmd, hdr);
2126
2127 reject:
2128         kfree(cmd->text_in_ptr);
2129         cmd->text_in_ptr = NULL;
2130         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2131 }
2132 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2133
2134 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2135 {
2136         struct iscsi_conn *conn_p;
2137         struct iscsi_session *sess = conn->sess;
2138
2139         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2140                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2141
2142         atomic_set(&sess->session_logout, 1);
2143         atomic_set(&conn->conn_logout_remove, 1);
2144         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2145
2146         iscsit_inc_conn_usage_count(conn);
2147         iscsit_inc_session_usage_count(sess);
2148
2149         spin_lock_bh(&sess->conn_lock);
2150         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2151                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2152                         continue;
2153
2154                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2155                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2156         }
2157         spin_unlock_bh(&sess->conn_lock);
2158
2159         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2160
2161         return 0;
2162 }
2163
2164 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2165 {
2166         struct iscsi_conn *l_conn;
2167         struct iscsi_session *sess = conn->sess;
2168
2169         pr_debug("Received logout request CLOSECONNECTION for CID:"
2170                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2171
2172         /*
2173          * A Logout Request with a CLOSECONNECTION reason code for a CID
2174          * can arrive on a connection with a differing CID.
2175          */
2176         if (conn->cid == cmd->logout_cid) {
2177                 spin_lock_bh(&conn->state_lock);
2178                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2179                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2180
2181                 atomic_set(&conn->conn_logout_remove, 1);
2182                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2183                 iscsit_inc_conn_usage_count(conn);
2184
2185                 spin_unlock_bh(&conn->state_lock);
2186         } else {
2187                 /*
2188                  * Handle all different cid CLOSECONNECTION requests in
2189                  * iscsit_logout_post_handler_diffcid() as to give enough
2190                  * time for any non immediate command's CmdSN to be
2191                  * acknowledged on the connection in question.
2192                  *
2193                  * Here we simply make sure the CID is still around.
2194                  */
2195                 l_conn = iscsit_get_conn_from_cid(sess,
2196                                 cmd->logout_cid);
2197                 if (!l_conn) {
2198                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2199                         iscsit_add_cmd_to_response_queue(cmd, conn,
2200                                         cmd->i_state);
2201                         return 0;
2202                 }
2203
2204                 iscsit_dec_conn_usage_count(l_conn);
2205         }
2206
2207         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2208
2209         return 0;
2210 }
2211
2212 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2213 {
2214         struct iscsi_session *sess = conn->sess;
2215
2216         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2217                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2218
2219         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2220                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2221                         " while ERL!=2.\n");
2222                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2223                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2224                 return 0;
2225         }
2226
2227         if (conn->cid == cmd->logout_cid) {
2228                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2229                         " with CID: %hu on CID: %hu, implementation error.\n",
2230                                 cmd->logout_cid, conn->cid);
2231                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2232                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2233                 return 0;
2234         }
2235
2236         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2237
2238         return 0;
2239 }
2240
2241 int
2242 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2243                         unsigned char *buf)
2244 {
2245         int cmdsn_ret, logout_remove = 0;
2246         u8 reason_code = 0;
2247         struct iscsi_logout *hdr;
2248         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2249
2250         hdr                     = (struct iscsi_logout *) buf;
2251         reason_code             = (hdr->flags & 0x7f);
2252
2253         if (tiqn) {
2254                 spin_lock(&tiqn->logout_stats.lock);
2255                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2256                         tiqn->logout_stats.normal_logouts++;
2257                 else
2258                         tiqn->logout_stats.abnormal_logouts++;
2259                 spin_unlock(&tiqn->logout_stats.lock);
2260         }
2261
2262         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2263                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2264                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2265                 hdr->cid, conn->cid);
2266
2267         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2268                 pr_err("Received logout request on connection that"
2269                         " is not in logged in state, ignoring request.\n");
2270                 iscsit_free_cmd(cmd, false);
2271                 return 0;
2272         }
2273
2274         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2275         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2276         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2277         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2278         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2279         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2280         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2281         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2282         cmd->logout_reason      = reason_code;
2283         cmd->data_direction     = DMA_NONE;
2284
2285         /*
2286          * We need to sleep in these cases (by returning 1) until the Logout
2287          * Response gets sent in the tx thread.
2288          */
2289         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2290            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2291             be16_to_cpu(hdr->cid) == conn->cid))
2292                 logout_remove = 1;
2293
2294         spin_lock_bh(&conn->cmd_lock);
2295         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2296         spin_unlock_bh(&conn->cmd_lock);
2297
2298         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2299                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2300
2301         /*
2302          * Immediate commands are executed, well, immediately.
2303          * Non-Immediate Logout Commands are executed in CmdSN order.
2304          */
2305         if (cmd->immediate_cmd) {
2306                 int ret = iscsit_execute_cmd(cmd, 0);
2307
2308                 if (ret < 0)
2309                         return ret;
2310         } else {
2311                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2312                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2313                         logout_remove = 0;
2314                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2315                         return -1;
2316         }
2317
2318         return logout_remove;
2319 }
2320 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2321
2322 static int iscsit_handle_snack(
2323         struct iscsi_conn *conn,
2324         unsigned char *buf)
2325 {
2326         struct iscsi_snack *hdr;
2327
2328         hdr                     = (struct iscsi_snack *) buf;
2329         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2330
2331         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2332                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2333                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2334                         hdr->begrun, hdr->runlength, conn->cid);
2335
2336         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2337                 pr_err("Initiator sent SNACK request while in"
2338                         " ErrorRecoveryLevel=0.\n");
2339                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2340                                          buf);
2341         }
2342         /*
2343          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2344          * call from inside iscsi_send_recovery_datain_or_r2t().
2345          */
2346         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2347         case 0:
2348                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2349                         hdr->itt,
2350                         be32_to_cpu(hdr->ttt),
2351                         be32_to_cpu(hdr->begrun),
2352                         be32_to_cpu(hdr->runlength));
2353         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2354                 return iscsit_handle_status_snack(conn, hdr->itt,
2355                         be32_to_cpu(hdr->ttt),
2356                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2357         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2358                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2359                         be32_to_cpu(hdr->begrun),
2360                         be32_to_cpu(hdr->runlength));
2361         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2362                 /* FIXME: Support R-Data SNACK */
2363                 pr_err("R-Data SNACK Not Supported.\n");
2364                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2365                                          buf);
2366         default:
2367                 pr_err("Unknown SNACK type 0x%02x, protocol"
2368                         " error.\n", hdr->flags & 0x0f);
2369                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2370                                          buf);
2371         }
2372
2373         return 0;
2374 }
2375
2376 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2377 {
2378         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2379             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2380                 wait_for_completion_interruptible_timeout(
2381                                         &conn->rx_half_close_comp,
2382                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2383         }
2384 }
2385
2386 static int iscsit_handle_immediate_data(
2387         struct iscsi_cmd *cmd,
2388         struct iscsi_scsi_req *hdr,
2389         u32 length)
2390 {
2391         int iov_ret, rx_got = 0, rx_size = 0;
2392         u32 checksum, iov_count = 0, padding = 0;
2393         struct iscsi_conn *conn = cmd->conn;
2394         struct kvec *iov;
2395
2396         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2397         if (iov_ret < 0)
2398                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2399
2400         rx_size = length;
2401         iov_count = iov_ret;
2402         iov = &cmd->iov_data[0];
2403
2404         padding = ((-length) & 3);
2405         if (padding != 0) {
2406                 iov[iov_count].iov_base = cmd->pad_bytes;
2407                 iov[iov_count++].iov_len = padding;
2408                 rx_size += padding;
2409         }
2410
2411         if (conn->conn_ops->DataDigest) {
2412                 iov[iov_count].iov_base         = &checksum;
2413                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2414                 rx_size += ISCSI_CRC_LEN;
2415         }
2416
2417         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2418
2419         iscsit_unmap_iovec(cmd);
2420
2421         if (rx_got != rx_size) {
2422                 iscsit_rx_thread_wait_for_tcp(conn);
2423                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2424         }
2425
2426         if (conn->conn_ops->DataDigest) {
2427                 u32 data_crc;
2428
2429                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2430                                                     cmd->write_data_done, length, padding,
2431                                                     cmd->pad_bytes);
2432
2433                 if (checksum != data_crc) {
2434                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2435                                 " does not match computed 0x%08x\n", checksum,
2436                                 data_crc);
2437
2438                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2439                                 pr_err("Unable to recover from"
2440                                         " Immediate Data digest failure while"
2441                                         " in ERL=0.\n");
2442                                 iscsit_reject_cmd(cmd,
2443                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2444                                                 (unsigned char *)hdr);
2445                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2446                         } else {
2447                                 iscsit_reject_cmd(cmd,
2448                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2449                                                 (unsigned char *)hdr);
2450                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2451                         }
2452                 } else {
2453                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2454                                 " %u bytes of Immediate Data\n", checksum,
2455                                 length);
2456                 }
2457         }
2458
2459         cmd->write_data_done += length;
2460
2461         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2462                 spin_lock_bh(&cmd->istate_lock);
2463                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2464                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2465                 spin_unlock_bh(&cmd->istate_lock);
2466         }
2467
2468         return IMMEDIATE_DATA_NORMAL_OPERATION;
2469 }
2470
2471 /*
2472  *      Called with sess->conn_lock held.
2473  */
2474 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2475         with active network interface */
2476 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2477 {
2478         struct iscsi_cmd *cmd;
2479         struct iscsi_conn *conn_p;
2480
2481         /*
2482          * Only send a Asynchronous Message on connections whos network
2483          * interface is still functional.
2484          */
2485         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2486                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2487                         iscsit_inc_conn_usage_count(conn_p);
2488                         break;
2489                 }
2490         }
2491
2492         if (!conn_p)
2493                 return;
2494
2495         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2496         if (!cmd) {
2497                 iscsit_dec_conn_usage_count(conn_p);
2498                 return;
2499         }
2500
2501         cmd->logout_cid = conn->cid;
2502         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2503         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2504
2505         spin_lock_bh(&conn_p->cmd_lock);
2506         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2507         spin_unlock_bh(&conn_p->cmd_lock);
2508
2509         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2510         iscsit_dec_conn_usage_count(conn_p);
2511 }
2512
2513 static int iscsit_send_conn_drop_async_message(
2514         struct iscsi_cmd *cmd,
2515         struct iscsi_conn *conn)
2516 {
2517         struct iscsi_async *hdr;
2518
2519         cmd->tx_size = ISCSI_HDR_LEN;
2520         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2521
2522         hdr                     = (struct iscsi_async *) cmd->pdu;
2523         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2524         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2525         cmd->init_task_tag      = RESERVED_ITT;
2526         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2527         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2528         cmd->stat_sn            = conn->stat_sn++;
2529         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2530         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2531         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2532         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2533         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2534         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2535         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2536
2537         if (conn->conn_ops->HeaderDigest) {
2538                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2539
2540                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2541                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2542
2543                 cmd->tx_size += ISCSI_CRC_LEN;
2544                 pr_debug("Attaching CRC32C HeaderDigest to"
2545                         " Async Message 0x%08x\n", *header_digest);
2546         }
2547
2548         cmd->iov_misc[0].iov_base       = cmd->pdu;
2549         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2550         cmd->iov_misc_count             = 1;
2551
2552         pr_debug("Sending Connection Dropped Async Message StatSN:"
2553                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2554                         cmd->logout_cid, conn->cid);
2555         return 0;
2556 }
2557
2558 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2559 {
2560         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2561             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2562                 wait_for_completion_interruptible_timeout(
2563                                         &conn->tx_half_close_comp,
2564                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2565         }
2566 }
2567
2568 static void
2569 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2570                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2571                         bool set_statsn)
2572 {
2573         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2574         hdr->flags              = datain->flags;
2575         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2576                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2577                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2578                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2579                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2580                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2581                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2582                 }
2583         }
2584         hton24(hdr->dlength, datain->length);
2585         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2586                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2587                                 (struct scsi_lun *)&hdr->lun);
2588         else
2589                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2590
2591         hdr->itt                = cmd->init_task_tag;
2592
2593         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2594                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2595         else
2596                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2597         if (set_statsn)
2598                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2599         else
2600                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2601
2602         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2603         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2604         hdr->datasn             = cpu_to_be32(datain->data_sn);
2605         hdr->offset             = cpu_to_be32(datain->offset);
2606
2607         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2608                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2609                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2610                 ntohl(hdr->offset), datain->length, conn->cid);
2611 }
2612
2613 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2614 {
2615         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2616         struct iscsi_datain datain;
2617         struct iscsi_datain_req *dr;
2618         struct kvec *iov;
2619         u32 iov_count = 0, tx_size = 0;
2620         int eodr = 0, ret, iov_ret;
2621         bool set_statsn = false;
2622
2623         memset(&datain, 0, sizeof(struct iscsi_datain));
2624         dr = iscsit_get_datain_values(cmd, &datain);
2625         if (!dr) {
2626                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2627                                 cmd->init_task_tag);
2628                 return -1;
2629         }
2630         /*
2631          * Be paranoid and double check the logic for now.
2632          */
2633         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2634                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2635                         " datain.length: %u exceeds cmd->data_length: %u\n",
2636                         cmd->init_task_tag, datain.offset, datain.length,
2637                         cmd->se_cmd.data_length);
2638                 return -1;
2639         }
2640
2641         spin_lock_bh(&conn->sess->session_stats_lock);
2642         conn->sess->tx_data_octets += datain.length;
2643         if (conn->sess->se_sess->se_node_acl) {
2644                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2645                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2646                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2647         }
2648         spin_unlock_bh(&conn->sess->session_stats_lock);
2649         /*
2650          * Special case for successfully execution w/ both DATAIN
2651          * and Sense Data.
2652          */
2653         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2654             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2655                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2656         else {
2657                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2658                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2659                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2660                         cmd->stat_sn = conn->stat_sn++;
2661                         set_statsn = true;
2662                 } else if (dr->dr_complete ==
2663                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2664                         set_statsn = true;
2665         }
2666
2667         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2668
2669         iov = &cmd->iov_data[0];
2670         iov[iov_count].iov_base = cmd->pdu;
2671         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2672         tx_size += ISCSI_HDR_LEN;
2673
2674         if (conn->conn_ops->HeaderDigest) {
2675                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2676
2677                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2678                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2679
2680                 iov[0].iov_len += ISCSI_CRC_LEN;
2681                 tx_size += ISCSI_CRC_LEN;
2682
2683                 pr_debug("Attaching CRC32 HeaderDigest"
2684                         " for DataIN PDU 0x%08x\n", *header_digest);
2685         }
2686
2687         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2688                                 datain.offset, datain.length);
2689         if (iov_ret < 0)
2690                 return -1;
2691
2692         iov_count += iov_ret;
2693         tx_size += datain.length;
2694
2695         cmd->padding = ((-datain.length) & 3);
2696         if (cmd->padding) {
2697                 iov[iov_count].iov_base         = cmd->pad_bytes;
2698                 iov[iov_count++].iov_len        = cmd->padding;
2699                 tx_size += cmd->padding;
2700
2701                 pr_debug("Attaching %u padding bytes\n",
2702                                 cmd->padding);
2703         }
2704         if (conn->conn_ops->DataDigest) {
2705                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2706                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2707
2708                 iov[iov_count].iov_base = &cmd->data_crc;
2709                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2710                 tx_size += ISCSI_CRC_LEN;
2711
2712                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2713                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2714         }
2715
2716         cmd->iov_data_count = iov_count;
2717         cmd->tx_size = tx_size;
2718
2719         /* sendpage is preferred but can't insert markers */
2720         if (!conn->conn_ops->IFMarker)
2721                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2722         else
2723                 ret = iscsit_send_tx_data(cmd, conn, 0);
2724
2725         iscsit_unmap_iovec(cmd);
2726
2727         if (ret < 0) {
2728                 iscsit_tx_thread_wait_for_tcp(conn);
2729                 return ret;
2730         }
2731
2732         if (dr->dr_complete) {
2733                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2734                                 2 : 1;
2735                 iscsit_free_datain_req(cmd, dr);
2736         }
2737
2738         return eodr;
2739 }
2740
2741 int
2742 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2743                         struct iscsi_logout_rsp *hdr)
2744 {
2745         struct iscsi_conn *logout_conn = NULL;
2746         struct iscsi_conn_recovery *cr = NULL;
2747         struct iscsi_session *sess = conn->sess;
2748         /*
2749          * The actual shutting down of Sessions and/or Connections
2750          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2751          * is done in scsi_logout_post_handler().
2752          */
2753         switch (cmd->logout_reason) {
2754         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2755                 pr_debug("iSCSI session logout successful, setting"
2756                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2757                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2758                 break;
2759         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2760                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2761                         break;
2762                 /*
2763                  * For CLOSECONNECTION logout requests carrying
2764                  * a matching logout CID -> local CID, the reference
2765                  * for the local CID will have been incremented in
2766                  * iscsi_logout_closeconnection().
2767                  *
2768                  * For CLOSECONNECTION logout requests carrying
2769                  * a different CID than the connection it arrived
2770                  * on, the connection responding to cmd->logout_cid
2771                  * is stopped in iscsit_logout_post_handler_diffcid().
2772                  */
2773
2774                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2775                         " successful.\n", cmd->logout_cid, conn->cid);
2776                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2777                 break;
2778         case ISCSI_LOGOUT_REASON_RECOVERY:
2779                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2780                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2781                         break;
2782                 /*
2783                  * If the connection is still active from our point of view
2784                  * force connection recovery to occur.
2785                  */
2786                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2787                                 cmd->logout_cid);
2788                 if (logout_conn) {
2789                         iscsit_connection_reinstatement_rcfr(logout_conn);
2790                         iscsit_dec_conn_usage_count(logout_conn);
2791                 }
2792
2793                 cr = iscsit_get_inactive_connection_recovery_entry(
2794                                 conn->sess, cmd->logout_cid);
2795                 if (!cr) {
2796                         pr_err("Unable to locate CID: %hu for"
2797                         " REMOVECONNFORRECOVERY Logout Request.\n",
2798                                 cmd->logout_cid);
2799                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2800                         break;
2801                 }
2802
2803                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2804
2805                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2806                         " for recovery for CID: %hu on CID: %hu successful.\n",
2807                                 cmd->logout_cid, conn->cid);
2808                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2809                 break;
2810         default:
2811                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2812                                 cmd->logout_reason);
2813                 return -1;
2814         }
2815
2816         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2817         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2818         hdr->response           = cmd->logout_response;
2819         hdr->itt                = cmd->init_task_tag;
2820         cmd->stat_sn            = conn->stat_sn++;
2821         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2822
2823         iscsit_increment_maxcmdsn(cmd, conn->sess);
2824         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2825         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2826
2827         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2828                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2829                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2830                 cmd->logout_cid, conn->cid);
2831
2832         return 0;
2833 }
2834 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2835
2836 static int
2837 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2838 {
2839         struct kvec *iov;
2840         int niov = 0, tx_size, rc;
2841
2842         rc = iscsit_build_logout_rsp(cmd, conn,
2843                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2844         if (rc < 0)
2845                 return rc;
2846
2847         tx_size = ISCSI_HDR_LEN;
2848         iov = &cmd->iov_misc[0];
2849         iov[niov].iov_base      = cmd->pdu;
2850         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2851
2852         if (conn->conn_ops->HeaderDigest) {
2853                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2854
2855                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2856                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2857
2858                 iov[0].iov_len += ISCSI_CRC_LEN;
2859                 tx_size += ISCSI_CRC_LEN;
2860                 pr_debug("Attaching CRC32C HeaderDigest to"
2861                         " Logout Response 0x%08x\n", *header_digest);
2862         }
2863         cmd->iov_misc_count = niov;
2864         cmd->tx_size = tx_size;
2865
2866         return 0;
2867 }
2868
2869 void
2870 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2871                        struct iscsi_nopin *hdr, bool nopout_response)
2872 {
2873         hdr->opcode             = ISCSI_OP_NOOP_IN;
2874         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2875         hton24(hdr->dlength, cmd->buf_ptr_size);
2876         if (nopout_response)
2877                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2878         hdr->itt                = cmd->init_task_tag;
2879         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2880         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2881                                   conn->stat_sn;
2882         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2883
2884         if (nopout_response)
2885                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2886
2887         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2888         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2889
2890         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2891                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2892                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2893                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2894 }
2895 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2896
2897 /*
2898  *      Unsolicited NOPIN, either requesting a response or not.
2899  */
2900 static int iscsit_send_unsolicited_nopin(
2901         struct iscsi_cmd *cmd,
2902         struct iscsi_conn *conn,
2903         int want_response)
2904 {
2905         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2906         int tx_size = ISCSI_HDR_LEN, ret;
2907
2908         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2909
2910         if (conn->conn_ops->HeaderDigest) {
2911                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2912
2913                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2914                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2915
2916                 tx_size += ISCSI_CRC_LEN;
2917                 pr_debug("Attaching CRC32C HeaderDigest to"
2918                         " NopIN 0x%08x\n", *header_digest);
2919         }
2920
2921         cmd->iov_misc[0].iov_base       = cmd->pdu;
2922         cmd->iov_misc[0].iov_len        = tx_size;
2923         cmd->iov_misc_count     = 1;
2924         cmd->tx_size            = tx_size;
2925
2926         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2927                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2928
2929         ret = iscsit_send_tx_data(cmd, conn, 1);
2930         if (ret < 0) {
2931                 iscsit_tx_thread_wait_for_tcp(conn);
2932                 return ret;
2933         }
2934
2935         spin_lock_bh(&cmd->istate_lock);
2936         cmd->i_state = want_response ?
2937                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2938         spin_unlock_bh(&cmd->istate_lock);
2939
2940         return 0;
2941 }
2942
2943 static int
2944 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2945 {
2946         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2947         struct kvec *iov;
2948         u32 padding = 0;
2949         int niov = 0, tx_size;
2950
2951         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2952
2953         tx_size = ISCSI_HDR_LEN;
2954         iov = &cmd->iov_misc[0];
2955         iov[niov].iov_base      = cmd->pdu;
2956         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2957
2958         if (conn->conn_ops->HeaderDigest) {
2959                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2960
2961                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2962                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2963
2964                 iov[0].iov_len += ISCSI_CRC_LEN;
2965                 tx_size += ISCSI_CRC_LEN;
2966                 pr_debug("Attaching CRC32C HeaderDigest"
2967                         " to NopIn 0x%08x\n", *header_digest);
2968         }
2969
2970         /*
2971          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2972          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2973          */
2974         if (cmd->buf_ptr_size) {
2975                 iov[niov].iov_base      = cmd->buf_ptr;
2976                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2977                 tx_size += cmd->buf_ptr_size;
2978
2979                 pr_debug("Echoing back %u bytes of ping"
2980                         " data.\n", cmd->buf_ptr_size);
2981
2982                 padding = ((-cmd->buf_ptr_size) & 3);
2983                 if (padding != 0) {
2984                         iov[niov].iov_base = &cmd->pad_bytes;
2985                         iov[niov++].iov_len = padding;
2986                         tx_size += padding;
2987                         pr_debug("Attaching %u additional"
2988                                 " padding bytes.\n", padding);
2989                 }
2990                 if (conn->conn_ops->DataDigest) {
2991                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2992                                 cmd->buf_ptr, cmd->buf_ptr_size,
2993                                 padding, (u8 *)&cmd->pad_bytes,
2994                                 (u8 *)&cmd->data_crc);
2995
2996                         iov[niov].iov_base = &cmd->data_crc;
2997                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2998                         tx_size += ISCSI_CRC_LEN;
2999                         pr_debug("Attached DataDigest for %u"
3000                                 " bytes of ping data, CRC 0x%08x\n",
3001                                 cmd->buf_ptr_size, cmd->data_crc);
3002                 }
3003         }
3004
3005         cmd->iov_misc_count = niov;
3006         cmd->tx_size = tx_size;
3007
3008         return 0;
3009 }
3010
3011 static int iscsit_send_r2t(
3012         struct iscsi_cmd *cmd,
3013         struct iscsi_conn *conn)
3014 {
3015         int tx_size = 0;
3016         struct iscsi_r2t *r2t;
3017         struct iscsi_r2t_rsp *hdr;
3018         int ret;
3019
3020         r2t = iscsit_get_r2t_from_list(cmd);
3021         if (!r2t)
3022                 return -1;
3023
3024         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3025         memset(hdr, 0, ISCSI_HDR_LEN);
3026         hdr->opcode             = ISCSI_OP_R2T;
3027         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3028         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3029                         (struct scsi_lun *)&hdr->lun);
3030         hdr->itt                = cmd->init_task_tag;
3031         spin_lock_bh(&conn->sess->ttt_lock);
3032         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3033         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3034                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3035         spin_unlock_bh(&conn->sess->ttt_lock);
3036         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3037         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3038         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3039         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3040         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3041         hdr->data_offset        = cpu_to_be32(r2t->offset);
3042         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3043
3044         cmd->iov_misc[0].iov_base       = cmd->pdu;
3045         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3046         tx_size += ISCSI_HDR_LEN;
3047
3048         if (conn->conn_ops->HeaderDigest) {
3049                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3050
3051                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3052                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3053
3054                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3055                 tx_size += ISCSI_CRC_LEN;
3056                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3057                         " PDU 0x%08x\n", *header_digest);
3058         }
3059
3060         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3061                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3062                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3063                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3064                         r2t->offset, r2t->xfer_len, conn->cid);
3065
3066         cmd->iov_misc_count = 1;
3067         cmd->tx_size = tx_size;
3068
3069         spin_lock_bh(&cmd->r2t_lock);
3070         r2t->sent_r2t = 1;
3071         spin_unlock_bh(&cmd->r2t_lock);
3072
3073         ret = iscsit_send_tx_data(cmd, conn, 1);
3074         if (ret < 0) {
3075                 iscsit_tx_thread_wait_for_tcp(conn);
3076                 return ret;
3077         }
3078
3079         spin_lock_bh(&cmd->dataout_timeout_lock);
3080         iscsit_start_dataout_timer(cmd, conn);
3081         spin_unlock_bh(&cmd->dataout_timeout_lock);
3082
3083         return 0;
3084 }
3085
3086 /*
3087  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3088  *              connection recovery.
3089  */
3090 int iscsit_build_r2ts_for_cmd(
3091         struct iscsi_conn *conn,
3092         struct iscsi_cmd *cmd,
3093         bool recovery)
3094 {
3095         int first_r2t = 1;
3096         u32 offset = 0, xfer_len = 0;
3097
3098         spin_lock_bh(&cmd->r2t_lock);
3099         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3100                 spin_unlock_bh(&cmd->r2t_lock);
3101                 return 0;
3102         }
3103
3104         if (conn->sess->sess_ops->DataSequenceInOrder &&
3105             !recovery)
3106                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3107
3108         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3109                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3110                         offset = cmd->r2t_offset;
3111
3112                         if (first_r2t && recovery) {
3113                                 int new_data_end = offset +
3114                                         conn->sess->sess_ops->MaxBurstLength -
3115                                         cmd->next_burst_len;
3116
3117                                 if (new_data_end > cmd->se_cmd.data_length)
3118                                         xfer_len = cmd->se_cmd.data_length - offset;
3119                                 else
3120                                         xfer_len =
3121                                                 conn->sess->sess_ops->MaxBurstLength -
3122                                                 cmd->next_burst_len;
3123                         } else {
3124                                 int new_data_end = offset +
3125                                         conn->sess->sess_ops->MaxBurstLength;
3126
3127                                 if (new_data_end > cmd->se_cmd.data_length)
3128                                         xfer_len = cmd->se_cmd.data_length - offset;
3129                                 else
3130                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3131                         }
3132                         cmd->r2t_offset += xfer_len;
3133
3134                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3135                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3136                 } else {
3137                         struct iscsi_seq *seq;
3138
3139                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3140                         if (!seq) {
3141                                 spin_unlock_bh(&cmd->r2t_lock);
3142                                 return -1;
3143                         }
3144
3145                         offset = seq->offset;
3146                         xfer_len = seq->xfer_len;
3147
3148                         if (cmd->seq_send_order == cmd->seq_count)
3149                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3150                 }
3151                 cmd->outstanding_r2ts++;
3152                 first_r2t = 0;
3153
3154                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3155                         spin_unlock_bh(&cmd->r2t_lock);
3156                         return -1;
3157                 }
3158
3159                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3160                         break;
3161         }
3162         spin_unlock_bh(&cmd->r2t_lock);
3163
3164         return 0;
3165 }
3166
3167 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3168                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3169 {
3170         if (inc_stat_sn)
3171                 cmd->stat_sn = conn->stat_sn++;
3172
3173         spin_lock_bh(&conn->sess->session_stats_lock);
3174         conn->sess->rsp_pdus++;
3175         spin_unlock_bh(&conn->sess->session_stats_lock);
3176
3177         memset(hdr, 0, ISCSI_HDR_LEN);
3178         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3179         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3180         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3181                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3182                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3183         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3184                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3185                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3186         }
3187         hdr->response           = cmd->iscsi_response;
3188         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3189         hdr->itt                = cmd->init_task_tag;
3190         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3191
3192         iscsit_increment_maxcmdsn(cmd, conn->sess);
3193         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3194         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3195
3196         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3197                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3198                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3199                 cmd->se_cmd.scsi_status, conn->cid);
3200 }
3201 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3202
3203 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3204 {
3205         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3206         struct kvec *iov;
3207         u32 padding = 0, tx_size = 0;
3208         int iov_count = 0;
3209         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3210
3211         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3212
3213         iov = &cmd->iov_misc[0];
3214         iov[iov_count].iov_base = cmd->pdu;
3215         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3216         tx_size += ISCSI_HDR_LEN;
3217
3218         /*
3219          * Attach SENSE DATA payload to iSCSI Response PDU
3220          */
3221         if (cmd->se_cmd.sense_buffer &&
3222            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3223             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3224                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3225                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3226
3227                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3228                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3229                 iov[iov_count].iov_base = cmd->sense_buffer;
3230                 iov[iov_count++].iov_len =
3231                                 (cmd->se_cmd.scsi_sense_length + padding);
3232                 tx_size += cmd->se_cmd.scsi_sense_length;
3233
3234                 if (padding) {
3235                         memset(cmd->sense_buffer +
3236                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3237                         tx_size += padding;
3238                         pr_debug("Adding %u bytes of padding to"
3239                                 " SENSE.\n", padding);
3240                 }
3241
3242                 if (conn->conn_ops->DataDigest) {
3243                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3244                                 cmd->sense_buffer,
3245                                 (cmd->se_cmd.scsi_sense_length + padding),
3246                                 0, NULL, (u8 *)&cmd->data_crc);
3247
3248                         iov[iov_count].iov_base    = &cmd->data_crc;
3249                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3250                         tx_size += ISCSI_CRC_LEN;
3251
3252                         pr_debug("Attaching CRC32 DataDigest for"
3253                                 " SENSE, %u bytes CRC 0x%08x\n",
3254                                 (cmd->se_cmd.scsi_sense_length + padding),
3255                                 cmd->data_crc);
3256                 }
3257
3258                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3259                                 " Response PDU\n",
3260                                 cmd->se_cmd.scsi_sense_length);
3261         }
3262
3263         if (conn->conn_ops->HeaderDigest) {
3264                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3265
3266                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3267                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3268
3269                 iov[0].iov_len += ISCSI_CRC_LEN;
3270                 tx_size += ISCSI_CRC_LEN;
3271                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3272                                 " PDU 0x%08x\n", *header_digest);
3273         }
3274
3275         cmd->iov_misc_count = iov_count;
3276         cmd->tx_size = tx_size;
3277
3278         return 0;
3279 }
3280
3281 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3282 {
3283         switch (se_tmr->response) {
3284         case TMR_FUNCTION_COMPLETE:
3285                 return ISCSI_TMF_RSP_COMPLETE;
3286         case TMR_TASK_DOES_NOT_EXIST:
3287                 return ISCSI_TMF_RSP_NO_TASK;
3288         case TMR_LUN_DOES_NOT_EXIST:
3289                 return ISCSI_TMF_RSP_NO_LUN;
3290         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3291                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3292         case TMR_FUNCTION_REJECTED:
3293         default:
3294                 return ISCSI_TMF_RSP_REJECTED;
3295         }
3296 }
3297
3298 void
3299 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3300                           struct iscsi_tm_rsp *hdr)
3301 {
3302         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3303
3304         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3305         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3306         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3307         hdr->itt                = cmd->init_task_tag;
3308         cmd->stat_sn            = conn->stat_sn++;
3309         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3310
3311         iscsit_increment_maxcmdsn(cmd, conn->sess);
3312         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3313         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3314
3315         pr_debug("Built Task Management Response ITT: 0x%08x,"
3316                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3317                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3318 }
3319 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3320
3321 static int
3322 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3323 {
3324         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3325         u32 tx_size = 0;
3326
3327         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3328
3329         cmd->iov_misc[0].iov_base       = cmd->pdu;
3330         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3331         tx_size += ISCSI_HDR_LEN;
3332
3333         if (conn->conn_ops->HeaderDigest) {
3334                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3335
3336                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3337                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3338
3339                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3340                 tx_size += ISCSI_CRC_LEN;
3341                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3342                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3343         }
3344
3345         cmd->iov_misc_count = 1;
3346         cmd->tx_size = tx_size;
3347
3348         return 0;
3349 }
3350
3351 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3352 {
3353         bool ret = false;
3354
3355         if (np->np_sockaddr.ss_family == AF_INET6) {
3356                 const struct sockaddr_in6 sin6 = {
3357                         .sin6_addr = IN6ADDR_ANY_INIT };
3358                 struct sockaddr_in6 *sock_in6 =
3359                          (struct sockaddr_in6 *)&np->np_sockaddr;
3360
3361                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3362                                 sin6.sin6_addr.s6_addr, 16))
3363                         ret = true;
3364         } else {
3365                 struct sockaddr_in * sock_in =
3366                         (struct sockaddr_in *)&np->np_sockaddr;
3367
3368                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3369                         ret = true;
3370         }
3371
3372         return ret;
3373 }
3374
3375 #define SENDTARGETS_BUF_LIMIT 32768U
3376
3377 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3378 {
3379         char *payload = NULL;
3380         struct iscsi_conn *conn = cmd->conn;
3381         struct iscsi_portal_group *tpg;
3382         struct iscsi_tiqn *tiqn;
3383         struct iscsi_tpg_np *tpg_np;
3384         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3385         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3386         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3387
3388         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3389                          SENDTARGETS_BUF_LIMIT);
3390
3391         payload = kzalloc(buffer_len, GFP_KERNEL);
3392         if (!payload) {
3393                 pr_err("Unable to allocate memory for sendtargets"
3394                                 " response.\n");
3395                 return -ENOMEM;
3396         }
3397         /*
3398          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3399          * explicit case..
3400          */
3401         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3402                 text_ptr = strchr(text_in, '=');
3403                 if (!text_ptr) {
3404                         pr_err("Unable to locate '=' string in text_in:"
3405                                " %s\n", text_in);
3406                         kfree(payload);
3407                         return -EINVAL;
3408                 }
3409                 /*
3410                  * Skip over '=' character..
3411                  */
3412                 text_ptr += 1;
3413         }
3414
3415         spin_lock(&tiqn_lock);
3416         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3417                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3418                      strcmp(tiqn->tiqn, text_ptr)) {
3419                         continue;
3420                 }
3421
3422                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3423                 len += 1;
3424
3425                 if ((len + payload_len) > buffer_len) {
3426                         end_of_buf = 1;
3427                         goto eob;
3428                 }
3429                 memcpy(payload + payload_len, buf, len);
3430                 payload_len += len;
3431
3432                 spin_lock(&tiqn->tiqn_tpg_lock);
3433                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3434
3435                         spin_lock(&tpg->tpg_state_lock);
3436                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3437                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3438                                 spin_unlock(&tpg->tpg_state_lock);
3439                                 continue;
3440                         }
3441                         spin_unlock(&tpg->tpg_state_lock);
3442
3443                         spin_lock(&tpg->tpg_np_lock);
3444                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3445                                                 tpg_np_list) {
3446                                 struct iscsi_np *np = tpg_np->tpg_np;
3447                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3448
3449                                 len = sprintf(buf, "TargetAddress="
3450                                         "%s%s%s:%hu,%hu",
3451                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3452                                         "[" : "", (inaddr_any == false) ?
3453                                                 np->np_ip : conn->local_ip,
3454                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3455                                         "]" : "", (inaddr_any == false) ?
3456                                                 np->np_port : conn->local_port,
3457                                         tpg->tpgt);
3458                                 len += 1;
3459
3460                                 if ((len + payload_len) > buffer_len) {
3461                                         spin_unlock(&tpg->tpg_np_lock);
3462                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3463                                         end_of_buf = 1;
3464                                         goto eob;
3465                                 }
3466                                 memcpy(payload + payload_len, buf, len);
3467                                 payload_len += len;
3468                         }
3469                         spin_unlock(&tpg->tpg_np_lock);
3470                 }
3471                 spin_unlock(&tiqn->tiqn_tpg_lock);
3472 eob:
3473                 if (end_of_buf)
3474                         break;
3475
3476                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3477                         break;
3478         }
3479         spin_unlock(&tiqn_lock);
3480
3481         cmd->buf_ptr = payload;
3482
3483         return payload_len;
3484 }
3485
3486 int
3487 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3488                       struct iscsi_text_rsp *hdr)
3489 {
3490         int text_length, padding;
3491
3492         text_length = iscsit_build_sendtargets_response(cmd);
3493         if (text_length < 0)
3494                 return text_length;
3495
3496         hdr->opcode = ISCSI_OP_TEXT_RSP;
3497         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3498         padding = ((-text_length) & 3);
3499         hton24(hdr->dlength, text_length);
3500         hdr->itt = cmd->init_task_tag;
3501         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3502         cmd->stat_sn = conn->stat_sn++;
3503         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3504
3505         iscsit_increment_maxcmdsn(cmd, conn->sess);
3506         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3507         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3508
3509         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3510                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3511                 text_length, conn->cid);
3512
3513         return text_length + padding;
3514 }
3515 EXPORT_SYMBOL(iscsit_build_text_rsp);
3516
3517 /*
3518  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3519  *      MaxRecvDataSegmentLength.
3520  */
3521 static int iscsit_send_text_rsp(
3522         struct iscsi_cmd *cmd,
3523         struct iscsi_conn *conn)
3524 {
3525         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3526         struct kvec *iov;
3527         u32 tx_size = 0;
3528         int text_length, iov_count = 0, rc;
3529
3530         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3531         if (rc < 0)
3532                 return rc;
3533
3534         text_length = rc;
3535         iov = &cmd->iov_misc[0];
3536         iov[iov_count].iov_base = cmd->pdu;
3537         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3538         iov[iov_count].iov_base = cmd->buf_ptr;
3539         iov[iov_count++].iov_len = text_length;
3540
3541         tx_size += (ISCSI_HDR_LEN + text_length);
3542
3543         if (conn->conn_ops->HeaderDigest) {
3544                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3545
3546                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3547                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3548
3549                 iov[0].iov_len += ISCSI_CRC_LEN;
3550                 tx_size += ISCSI_CRC_LEN;
3551                 pr_debug("Attaching CRC32 HeaderDigest for"
3552                         " Text Response PDU 0x%08x\n", *header_digest);
3553         }
3554
3555         if (conn->conn_ops->DataDigest) {
3556                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3557                                 cmd->buf_ptr, text_length,
3558                                 0, NULL, (u8 *)&cmd->data_crc);
3559
3560                 iov[iov_count].iov_base = &cmd->data_crc;
3561                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3562                 tx_size += ISCSI_CRC_LEN;
3563
3564                 pr_debug("Attaching DataDigest for %u bytes of text"
3565                         " data, CRC 0x%08x\n", text_length,
3566                         cmd->data_crc);
3567         }
3568
3569         cmd->iov_misc_count = iov_count;
3570         cmd->tx_size = tx_size;
3571
3572         return 0;
3573 }
3574
3575 void
3576 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3577                     struct iscsi_reject *hdr)
3578 {
3579         hdr->opcode             = ISCSI_OP_REJECT;
3580         hdr->reason             = cmd->reject_reason;
3581         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3582         hton24(hdr->dlength, ISCSI_HDR_LEN);
3583         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3584         cmd->stat_sn            = conn->stat_sn++;
3585         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3586         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3587         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3588
3589 }
3590 EXPORT_SYMBOL(iscsit_build_reject);
3591
3592 static int iscsit_send_reject(
3593         struct iscsi_cmd *cmd,
3594         struct iscsi_conn *conn)
3595 {
3596         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3597         struct kvec *iov;
3598         u32 iov_count = 0, tx_size;
3599
3600         iscsit_build_reject(cmd, conn, hdr);
3601
3602         iov = &cmd->iov_misc[0];
3603         iov[iov_count].iov_base = cmd->pdu;
3604         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3605         iov[iov_count].iov_base = cmd->buf_ptr;
3606         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3607
3608         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3609
3610         if (conn->conn_ops->HeaderDigest) {
3611                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3612
3613                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3614                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3615
3616                 iov[0].iov_len += ISCSI_CRC_LEN;
3617                 tx_size += ISCSI_CRC_LEN;
3618                 pr_debug("Attaching CRC32 HeaderDigest for"
3619                         " REJECT PDU 0x%08x\n", *header_digest);
3620         }
3621
3622         if (conn->conn_ops->DataDigest) {
3623                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3624                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3625
3626                 iov[iov_count].iov_base = &cmd->data_crc;
3627                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3628                 tx_size += ISCSI_CRC_LEN;
3629                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3630                                 " PDU 0x%08x\n", cmd->data_crc);
3631         }
3632
3633         cmd->iov_misc_count = iov_count;
3634         cmd->tx_size = tx_size;
3635
3636         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3637                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3638
3639         return 0;
3640 }
3641
3642 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3643 {
3644         struct iscsi_thread_set *ts = conn->thread_set;
3645         int ord, cpu;
3646         /*
3647          * thread_id is assigned from iscsit_global->ts_bitmap from
3648          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3649          *
3650          * Here we use thread_id to determine which CPU that this
3651          * iSCSI connection's iscsi_thread_set will be scheduled to
3652          * execute upon.
3653          */
3654         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3655         for_each_online_cpu(cpu) {
3656                 if (ord-- == 0) {
3657                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3658                         return;
3659                 }
3660         }
3661         /*
3662          * This should never be reached..
3663          */
3664         dump_stack();
3665         cpumask_setall(conn->conn_cpumask);
3666 }
3667
3668 static inline void iscsit_thread_check_cpumask(
3669         struct iscsi_conn *conn,
3670         struct task_struct *p,
3671         int mode)
3672 {
3673         char buf[128];
3674         /*
3675          * mode == 1 signals iscsi_target_tx_thread() usage.
3676          * mode == 0 signals iscsi_target_rx_thread() usage.
3677          */
3678         if (mode == 1) {
3679                 if (!conn->conn_tx_reset_cpumask)
3680                         return;
3681                 conn->conn_tx_reset_cpumask = 0;
3682         } else {
3683                 if (!conn->conn_rx_reset_cpumask)
3684                         return;
3685                 conn->conn_rx_reset_cpumask = 0;
3686         }
3687         /*
3688          * Update the CPU mask for this single kthread so that
3689          * both TX and RX kthreads are scheduled to run on the
3690          * same CPU.
3691          */
3692         memset(buf, 0, 128);
3693         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3694         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3695 }
3696
3697 static int
3698 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3699 {
3700         int ret;
3701
3702         switch (state) {
3703         case ISTATE_SEND_R2T:
3704                 ret = iscsit_send_r2t(cmd, conn);
3705                 if (ret < 0)
3706                         goto err;
3707                 break;
3708         case ISTATE_REMOVE:
3709                 spin_lock_bh(&conn->cmd_lock);
3710                 list_del(&cmd->i_conn_node);
3711                 spin_unlock_bh(&conn->cmd_lock);
3712
3713                 iscsit_free_cmd(cmd, false);
3714                 break;
3715         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3716                 iscsit_mod_nopin_response_timer(conn);
3717                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3718                 if (ret < 0)
3719                         goto err;
3720                 break;
3721         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3722                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3723                 if (ret < 0)
3724                         goto err;
3725                 break;
3726         default:
3727                 pr_err("Unknown Opcode: 0x%02x ITT:"
3728                        " 0x%08x, i_state: %d on CID: %hu\n",
3729                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3730                        conn->cid);
3731                 goto err;
3732         }
3733
3734         return 0;
3735
3736 err:
3737         return -1;
3738 }
3739
3740 static int
3741 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3742 {
3743         struct iscsit_transport *t = conn->conn_transport;
3744         struct iscsi_queue_req *qr;
3745         struct iscsi_cmd *cmd;
3746         u8 state;
3747         int ret;
3748
3749         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3750                 atomic_set(&conn->check_immediate_queue, 0);
3751                 cmd = qr->cmd;
3752                 state = qr->state;
3753                 kmem_cache_free(lio_qr_cache, qr);
3754
3755                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3756                 if (ret < 0)
3757                         return ret;
3758         }
3759
3760         return 0;
3761 }
3762
3763 static int
3764 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3765 {
3766         int ret;
3767
3768 check_rsp_state:
3769         switch (state) {
3770         case ISTATE_SEND_DATAIN:
3771                 ret = iscsit_send_datain(cmd, conn);
3772                 if (ret < 0)
3773                         goto err;
3774                 else if (!ret)
3775                         /* more drs */
3776                         goto check_rsp_state;
3777                 else if (ret == 1) {
3778                         /* all done */
3779                         spin_lock_bh(&cmd->istate_lock);
3780                         cmd->i_state = ISTATE_SENT_STATUS;
3781                         spin_unlock_bh(&cmd->istate_lock);
3782
3783                         if (atomic_read(&conn->check_immediate_queue))
3784                                 return 1;
3785
3786                         return 0;
3787                 } else if (ret == 2) {
3788                         /* Still must send status,
3789                            SCF_TRANSPORT_TASK_SENSE was set */
3790                         spin_lock_bh(&cmd->istate_lock);
3791                         cmd->i_state = ISTATE_SEND_STATUS;
3792                         spin_unlock_bh(&cmd->istate_lock);
3793                         state = ISTATE_SEND_STATUS;
3794                         goto check_rsp_state;
3795                 }
3796
3797                 break;
3798         case ISTATE_SEND_STATUS:
3799         case ISTATE_SEND_STATUS_RECOVERY:
3800                 ret = iscsit_send_response(cmd, conn);
3801                 break;
3802         case ISTATE_SEND_LOGOUTRSP:
3803                 ret = iscsit_send_logout(cmd, conn);
3804                 break;
3805         case ISTATE_SEND_ASYNCMSG:
3806                 ret = iscsit_send_conn_drop_async_message(
3807                         cmd, conn);
3808                 break;
3809         case ISTATE_SEND_NOPIN:
3810                 ret = iscsit_send_nopin(cmd, conn);
3811                 break;
3812         case ISTATE_SEND_REJECT:
3813                 ret = iscsit_send_reject(cmd, conn);
3814                 break;
3815         case ISTATE_SEND_TASKMGTRSP:
3816                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3817                 if (ret != 0)
3818                         break;
3819                 ret = iscsit_tmr_post_handler(cmd, conn);
3820                 if (ret != 0)
3821                         iscsit_fall_back_to_erl0(conn->sess);
3822                 break;
3823         case ISTATE_SEND_TEXTRSP:
3824                 ret = iscsit_send_text_rsp(cmd, conn);
3825                 break;
3826         default:
3827                 pr_err("Unknown Opcode: 0x%02x ITT:"
3828                        " 0x%08x, i_state: %d on CID: %hu\n",
3829                        cmd->iscsi_opcode, cmd->init_task_tag,
3830                        state, conn->cid);
3831                 goto err;
3832         }
3833         if (ret < 0)
3834                 goto err;
3835
3836         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3837                 iscsit_tx_thread_wait_for_tcp(conn);
3838                 iscsit_unmap_iovec(cmd);
3839                 goto err;
3840         }
3841         iscsit_unmap_iovec(cmd);
3842
3843         switch (state) {
3844         case ISTATE_SEND_LOGOUTRSP:
3845                 if (!iscsit_logout_post_handler(cmd, conn))
3846                         goto restart;
3847                 /* fall through */
3848         case ISTATE_SEND_STATUS:
3849         case ISTATE_SEND_ASYNCMSG:
3850         case ISTATE_SEND_NOPIN:
3851         case ISTATE_SEND_STATUS_RECOVERY:
3852         case ISTATE_SEND_TEXTRSP:
3853         case ISTATE_SEND_TASKMGTRSP:
3854         case ISTATE_SEND_REJECT:
3855                 spin_lock_bh(&cmd->istate_lock);
3856                 cmd->i_state = ISTATE_SENT_STATUS;
3857                 spin_unlock_bh(&cmd->istate_lock);
3858                 break;
3859         default:
3860                 pr_err("Unknown Opcode: 0x%02x ITT:"
3861                        " 0x%08x, i_state: %d on CID: %hu\n",
3862                        cmd->iscsi_opcode, cmd->init_task_tag,
3863                        cmd->i_state, conn->cid);
3864                 goto err;
3865         }
3866
3867         if (atomic_read(&conn->check_immediate_queue))
3868                 return 1;
3869
3870         return 0;
3871
3872 err:
3873         return -1;
3874 restart:
3875         return -EAGAIN;
3876 }
3877
3878 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3879 {
3880         struct iscsit_transport *t = conn->conn_transport;
3881         struct iscsi_queue_req *qr;
3882         struct iscsi_cmd *cmd;
3883         u8 state;
3884         int ret;
3885
3886         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3887                 cmd = qr->cmd;
3888                 state = qr->state;
3889                 kmem_cache_free(lio_qr_cache, qr);
3890
3891                 ret = t->iscsit_response_queue(conn, cmd, state);
3892                 if (ret == 1 || ret < 0)
3893                         return ret;
3894         }
3895
3896         return 0;
3897 }
3898
3899 int iscsi_target_tx_thread(void *arg)
3900 {
3901         int ret = 0;
3902         struct iscsi_conn *conn;
3903         struct iscsi_thread_set *ts = arg;
3904         /*
3905          * Allow ourselves to be interrupted by SIGINT so that a
3906          * connection recovery / failure event can be triggered externally.
3907          */
3908         allow_signal(SIGINT);
3909
3910 restart:
3911         conn = iscsi_tx_thread_pre_handler(ts);
3912         if (!conn)
3913                 goto out;
3914
3915         ret = 0;
3916
3917         while (!kthread_should_stop()) {
3918                 /*
3919                  * Ensure that both TX and RX per connection kthreads
3920                  * are scheduled to run on the same CPU.
3921                  */
3922                 iscsit_thread_check_cpumask(conn, current, 1);
3923
3924                 wait_event_interruptible(conn->queues_wq,
3925                                          !iscsit_conn_all_queues_empty(conn) ||
3926                                          ts->status == ISCSI_THREAD_SET_RESET);
3927
3928                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3929                      signal_pending(current))
3930                         goto transport_err;
3931
3932 get_immediate:
3933                 ret = iscsit_handle_immediate_queue(conn);
3934                 if (ret < 0)
3935                         goto transport_err;
3936
3937                 ret = iscsit_handle_response_queue(conn);
3938                 if (ret == 1)
3939                         goto get_immediate;
3940                 else if (ret == -EAGAIN)
3941                         goto restart;
3942                 else if (ret < 0)
3943                         goto transport_err;
3944         }
3945
3946 transport_err:
3947         iscsit_take_action_for_connection_exit(conn);
3948         goto restart;
3949 out:
3950         return 0;
3951 }
3952
3953 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3954 {
3955         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3956         struct iscsi_cmd *cmd;
3957         int ret = 0;
3958
3959         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3960         case ISCSI_OP_SCSI_CMD:
3961                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3962                 if (!cmd)
3963                         goto reject;
3964
3965                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3966                 break;
3967         case ISCSI_OP_SCSI_DATA_OUT:
3968                 ret = iscsit_handle_data_out(conn, buf);
3969                 break;
3970         case ISCSI_OP_NOOP_OUT:
3971                 cmd = NULL;
3972                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3973                         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3974                         if (!cmd)
3975                                 goto reject;
3976                 }
3977                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3978                 break;
3979         case ISCSI_OP_SCSI_TMFUNC:
3980                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3981                 if (!cmd)
3982                         goto reject;
3983
3984                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3985                 break;
3986         case ISCSI_OP_TEXT:
3987                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3988                 if (!cmd)
3989                         goto reject;
3990
3991                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3992                 break;
3993         case ISCSI_OP_LOGOUT:
3994                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3995                 if (!cmd)
3996                         goto reject;
3997
3998                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3999                 if (ret > 0)
4000                         wait_for_completion_timeout(&conn->conn_logout_comp,
4001                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4002                 break;
4003         case ISCSI_OP_SNACK:
4004                 ret = iscsit_handle_snack(conn, buf);
4005                 break;
4006         default:
4007                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4008                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4009                         pr_err("Cannot recover from unknown"
4010                         " opcode while ERL=0, closing iSCSI connection.\n");
4011                         return -1;
4012                 }
4013                 if (!conn->conn_ops->OFMarker) {
4014                         pr_err("Unable to recover from unknown"
4015                         " opcode while OFMarker=No, closing iSCSI"
4016                                 " connection.\n");
4017                         return -1;
4018                 }
4019                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4020                         pr_err("Unable to recover from unknown"
4021                                 " opcode, closing iSCSI connection.\n");
4022                         return -1;
4023                 }
4024                 break;
4025         }
4026
4027         return ret;
4028 reject:
4029         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4030 }
4031
4032 int iscsi_target_rx_thread(void *arg)
4033 {
4034         int ret;
4035         u8 buffer[ISCSI_HDR_LEN], opcode;
4036         u32 checksum = 0, digest = 0;
4037         struct iscsi_conn *conn = NULL;
4038         struct iscsi_thread_set *ts = arg;
4039         struct kvec iov;
4040         /*
4041          * Allow ourselves to be interrupted by SIGINT so that a
4042          * connection recovery / failure event can be triggered externally.
4043          */
4044         allow_signal(SIGINT);
4045
4046 restart:
4047         conn = iscsi_rx_thread_pre_handler(ts);
4048         if (!conn)
4049                 goto out;
4050
4051         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4052                 struct completion comp;
4053                 int rc;
4054
4055                 init_completion(&comp);
4056                 rc = wait_for_completion_interruptible(&comp);
4057                 if (rc < 0)
4058                         goto transport_err;
4059
4060                 goto out;
4061         }
4062
4063         while (!kthread_should_stop()) {
4064                 /*
4065                  * Ensure that both TX and RX per connection kthreads
4066                  * are scheduled to run on the same CPU.
4067                  */
4068                 iscsit_thread_check_cpumask(conn, current, 0);
4069
4070                 memset(buffer, 0, ISCSI_HDR_LEN);
4071                 memset(&iov, 0, sizeof(struct kvec));
4072
4073                 iov.iov_base    = buffer;
4074                 iov.iov_len     = ISCSI_HDR_LEN;
4075
4076                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4077                 if (ret != ISCSI_HDR_LEN) {
4078                         iscsit_rx_thread_wait_for_tcp(conn);
4079                         goto transport_err;
4080                 }
4081
4082                 if (conn->conn_ops->HeaderDigest) {
4083                         iov.iov_base    = &digest;
4084                         iov.iov_len     = ISCSI_CRC_LEN;
4085
4086                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4087                         if (ret != ISCSI_CRC_LEN) {
4088                                 iscsit_rx_thread_wait_for_tcp(conn);
4089                                 goto transport_err;
4090                         }
4091
4092                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4093                                         buffer, ISCSI_HDR_LEN,
4094                                         0, NULL, (u8 *)&checksum);
4095
4096                         if (digest != checksum) {
4097                                 pr_err("HeaderDigest CRC32C failed,"
4098                                         " received 0x%08x, computed 0x%08x\n",
4099                                         digest, checksum);
4100                                 /*
4101                                  * Set the PDU to 0xff so it will intentionally
4102                                  * hit default in the switch below.
4103                                  */
4104                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4105                                 spin_lock_bh(&conn->sess->session_stats_lock);
4106                                 conn->sess->conn_digest_errors++;
4107                                 spin_unlock_bh(&conn->sess->session_stats_lock);
4108                         } else {
4109                                 pr_debug("Got HeaderDigest CRC32C"
4110                                                 " 0x%08x\n", checksum);
4111                         }
4112                 }
4113
4114                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4115                         goto transport_err;
4116
4117                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4118
4119                 if (conn->sess->sess_ops->SessionType &&
4120                    ((!(opcode & ISCSI_OP_TEXT)) ||
4121                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4122                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4123                         " while in Discovery Session, rejecting.\n", opcode);
4124                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4125                                           buffer);
4126                         goto transport_err;
4127                 }
4128
4129                 ret = iscsi_target_rx_opcode(conn, buffer);
4130                 if (ret < 0)
4131                         goto transport_err;
4132         }
4133
4134 transport_err:
4135         if (!signal_pending(current))
4136                 atomic_set(&conn->transport_failed, 1);
4137         iscsit_take_action_for_connection_exit(conn);
4138         goto restart;
4139 out:
4140         return 0;
4141 }
4142
4143 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4144 {
4145         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4146         struct iscsi_session *sess = conn->sess;
4147         /*
4148          * We expect this function to only ever be called from either RX or TX
4149          * thread context via iscsit_close_connection() once the other context
4150          * has been reset -> returned sleeping pre-handler state.
4151          */
4152         spin_lock_bh(&conn->cmd_lock);
4153         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4154
4155                 list_del(&cmd->i_conn_node);
4156                 spin_unlock_bh(&conn->cmd_lock);
4157
4158                 iscsit_increment_maxcmdsn(cmd, sess);
4159
4160                 iscsit_free_cmd(cmd, true);
4161
4162                 spin_lock_bh(&conn->cmd_lock);
4163         }
4164         spin_unlock_bh(&conn->cmd_lock);
4165 }
4166
4167 static void iscsit_stop_timers_for_cmds(
4168         struct iscsi_conn *conn)
4169 {
4170         struct iscsi_cmd *cmd;
4171
4172         spin_lock_bh(&conn->cmd_lock);
4173         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4174                 if (cmd->data_direction == DMA_TO_DEVICE)
4175                         iscsit_stop_dataout_timer(cmd);
4176         }
4177         spin_unlock_bh(&conn->cmd_lock);
4178 }
4179
4180 int iscsit_close_connection(
4181         struct iscsi_conn *conn)
4182 {
4183         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4184         struct iscsi_session    *sess = conn->sess;
4185
4186         pr_debug("Closing iSCSI connection CID %hu on SID:"
4187                 " %u\n", conn->cid, sess->sid);
4188         /*
4189          * Always up conn_logout_comp just in case the RX Thread is sleeping
4190          * and the logout response never got sent because the connection
4191          * failed.
4192          */
4193         complete(&conn->conn_logout_comp);
4194
4195         iscsi_release_thread_set(conn);
4196
4197         iscsit_stop_timers_for_cmds(conn);
4198         iscsit_stop_nopin_response_timer(conn);
4199         iscsit_stop_nopin_timer(conn);
4200         iscsit_free_queue_reqs_for_conn(conn);
4201
4202         /*
4203          * During Connection recovery drop unacknowledged out of order
4204          * commands for this connection, and prepare the other commands
4205          * for realligence.
4206          *
4207          * During normal operation clear the out of order commands (but
4208          * do not free the struct iscsi_ooo_cmdsn's) and release all
4209          * struct iscsi_cmds.
4210          */
4211         if (atomic_read(&conn->connection_recovery)) {
4212                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4213                 iscsit_prepare_cmds_for_realligance(conn);
4214         } else {
4215                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4216                 iscsit_release_commands_from_conn(conn);
4217         }
4218
4219         /*
4220          * Handle decrementing session or connection usage count if
4221          * a logout response was not able to be sent because the
4222          * connection failed.  Fall back to Session Recovery here.
4223          */
4224         if (atomic_read(&conn->conn_logout_remove)) {
4225                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4226                         iscsit_dec_conn_usage_count(conn);
4227                         iscsit_dec_session_usage_count(sess);
4228                 }
4229                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4230                         iscsit_dec_conn_usage_count(conn);
4231
4232                 atomic_set(&conn->conn_logout_remove, 0);
4233                 atomic_set(&sess->session_reinstatement, 0);
4234                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4235         }
4236
4237         spin_lock_bh(&sess->conn_lock);
4238         list_del(&conn->conn_list);
4239
4240         /*
4241          * Attempt to let the Initiator know this connection failed by
4242          * sending an Connection Dropped Async Message on another
4243          * active connection.
4244          */
4245         if (atomic_read(&conn->connection_recovery))
4246                 iscsit_build_conn_drop_async_message(conn);
4247
4248         spin_unlock_bh(&sess->conn_lock);
4249
4250         /*
4251          * If connection reinstatement is being performed on this connection,
4252          * up the connection reinstatement semaphore that is being blocked on
4253          * in iscsit_cause_connection_reinstatement().
4254          */
4255         spin_lock_bh(&conn->state_lock);
4256         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4257                 spin_unlock_bh(&conn->state_lock);
4258                 complete(&conn->conn_wait_comp);
4259                 wait_for_completion(&conn->conn_post_wait_comp);
4260                 spin_lock_bh(&conn->state_lock);
4261         }
4262
4263         /*
4264          * If connection reinstatement is being performed on this connection
4265          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4266          * connection wait rcfr semaphore that is being blocked on
4267          * an iscsit_connection_reinstatement_rcfr().
4268          */
4269         if (atomic_read(&conn->connection_wait_rcfr)) {
4270                 spin_unlock_bh(&conn->state_lock);
4271                 complete(&conn->conn_wait_rcfr_comp);
4272                 wait_for_completion(&conn->conn_post_wait_comp);
4273                 spin_lock_bh(&conn->state_lock);
4274         }
4275         atomic_set(&conn->connection_reinstatement, 1);
4276         spin_unlock_bh(&conn->state_lock);
4277
4278         /*
4279          * If any other processes are accessing this connection pointer we
4280          * must wait until they have completed.
4281          */
4282         iscsit_check_conn_usage_count(conn);
4283
4284         if (conn->conn_rx_hash.tfm)
4285                 crypto_free_hash(conn->conn_rx_hash.tfm);
4286         if (conn->conn_tx_hash.tfm)
4287                 crypto_free_hash(conn->conn_tx_hash.tfm);
4288
4289         if (conn->conn_cpumask)
4290                 free_cpumask_var(conn->conn_cpumask);
4291
4292         kfree(conn->conn_ops);
4293         conn->conn_ops = NULL;
4294
4295         if (conn->sock)
4296                 sock_release(conn->sock);
4297
4298         if (conn->conn_transport->iscsit_free_conn)
4299                 conn->conn_transport->iscsit_free_conn(conn);
4300
4301         iscsit_put_transport(conn->conn_transport);
4302
4303         conn->thread_set = NULL;
4304
4305         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4306         conn->conn_state = TARG_CONN_STATE_FREE;
4307         kfree(conn);
4308
4309         spin_lock_bh(&sess->conn_lock);
4310         atomic_dec(&sess->nconn);
4311         pr_debug("Decremented iSCSI connection count to %hu from node:"
4312                 " %s\n", atomic_read(&sess->nconn),
4313                 sess->sess_ops->InitiatorName);
4314         /*
4315          * Make sure that if one connection fails in an non ERL=2 iSCSI
4316          * Session that they all fail.
4317          */
4318         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4319              !atomic_read(&sess->session_logout))
4320                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4321
4322         /*
4323          * If this was not the last connection in the session, and we are
4324          * performing session reinstatement or falling back to ERL=0, call
4325          * iscsit_stop_session() without sleeping to shutdown the other
4326          * active connections.
4327          */
4328         if (atomic_read(&sess->nconn)) {
4329                 if (!atomic_read(&sess->session_reinstatement) &&
4330                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4331                         spin_unlock_bh(&sess->conn_lock);
4332                         return 0;
4333                 }
4334                 if (!atomic_read(&sess->session_stop_active)) {
4335                         atomic_set(&sess->session_stop_active, 1);
4336                         spin_unlock_bh(&sess->conn_lock);
4337                         iscsit_stop_session(sess, 0, 0);
4338                         return 0;
4339                 }
4340                 spin_unlock_bh(&sess->conn_lock);
4341                 return 0;
4342         }
4343
4344         /*
4345          * If this was the last connection in the session and one of the
4346          * following is occurring:
4347          *
4348          * Session Reinstatement is not being performed, and are falling back
4349          * to ERL=0 call iscsit_close_session().
4350          *
4351          * Session Logout was requested.  iscsit_close_session() will be called
4352          * elsewhere.
4353          *
4354          * Session Continuation is not being performed, start the Time2Retain
4355          * handler and check if sleep_on_sess_wait_sem is active.
4356          */
4357         if (!atomic_read(&sess->session_reinstatement) &&
4358              atomic_read(&sess->session_fall_back_to_erl0)) {
4359                 spin_unlock_bh(&sess->conn_lock);
4360                 target_put_session(sess->se_sess);
4361
4362                 return 0;
4363         } else if (atomic_read(&sess->session_logout)) {
4364                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4365                 sess->session_state = TARG_SESS_STATE_FREE;
4366                 spin_unlock_bh(&sess->conn_lock);
4367
4368                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4369                         complete(&sess->session_wait_comp);
4370
4371                 return 0;
4372         } else {
4373                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4374                 sess->session_state = TARG_SESS_STATE_FAILED;
4375
4376                 if (!atomic_read(&sess->session_continuation)) {
4377                         spin_unlock_bh(&sess->conn_lock);
4378                         iscsit_start_time2retain_handler(sess);
4379                 } else
4380                         spin_unlock_bh(&sess->conn_lock);
4381
4382                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4383                         complete(&sess->session_wait_comp);
4384
4385                 return 0;
4386         }
4387         spin_unlock_bh(&sess->conn_lock);
4388
4389         return 0;
4390 }
4391
4392 int iscsit_close_session(struct iscsi_session *sess)
4393 {
4394         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4395         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4396
4397         if (atomic_read(&sess->nconn)) {
4398                 pr_err("%d connection(s) still exist for iSCSI session"
4399                         " to %s\n", atomic_read(&sess->nconn),
4400                         sess->sess_ops->InitiatorName);
4401                 BUG();
4402         }
4403
4404         spin_lock_bh(&se_tpg->session_lock);
4405         atomic_set(&sess->session_logout, 1);
4406         atomic_set(&sess->session_reinstatement, 1);
4407         iscsit_stop_time2retain_timer(sess);
4408         spin_unlock_bh(&se_tpg->session_lock);
4409
4410         /*
4411          * transport_deregister_session_configfs() will clear the
4412          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4413          * can be setting it again with __transport_register_session() in
4414          * iscsi_post_login_handler() again after the iscsit_stop_session()
4415          * completes in iscsi_np context.
4416          */
4417         transport_deregister_session_configfs(sess->se_sess);
4418
4419         /*
4420          * If any other processes are accessing this session pointer we must
4421          * wait until they have completed.  If we are in an interrupt (the
4422          * time2retain handler) and contain and active session usage count we
4423          * restart the timer and exit.
4424          */
4425         if (!in_interrupt()) {
4426                 if (iscsit_check_session_usage_count(sess) == 1)
4427                         iscsit_stop_session(sess, 1, 1);
4428         } else {
4429                 if (iscsit_check_session_usage_count(sess) == 2) {
4430                         atomic_set(&sess->session_logout, 0);
4431                         iscsit_start_time2retain_handler(sess);
4432                         return 0;
4433                 }
4434         }
4435
4436         transport_deregister_session(sess->se_sess);
4437
4438         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4439                 iscsit_free_connection_recovery_entires(sess);
4440
4441         iscsit_free_all_ooo_cmdsns(sess);
4442
4443         spin_lock_bh(&se_tpg->session_lock);
4444         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4445         sess->session_state = TARG_SESS_STATE_FREE;
4446         pr_debug("Released iSCSI session from node: %s\n",
4447                         sess->sess_ops->InitiatorName);
4448         tpg->nsessions--;
4449         if (tpg->tpg_tiqn)
4450                 tpg->tpg_tiqn->tiqn_nsessions--;
4451
4452         pr_debug("Decremented number of active iSCSI Sessions on"
4453                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4454
4455         spin_lock(&sess_idr_lock);
4456         idr_remove(&sess_idr, sess->session_index);
4457         spin_unlock(&sess_idr_lock);
4458
4459         kfree(sess->sess_ops);
4460         sess->sess_ops = NULL;
4461         spin_unlock_bh(&se_tpg->session_lock);
4462
4463         kfree(sess);
4464         return 0;
4465 }
4466
4467 static void iscsit_logout_post_handler_closesession(
4468         struct iscsi_conn *conn)
4469 {
4470         struct iscsi_session *sess = conn->sess;
4471
4472         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4473         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4474
4475         atomic_set(&conn->conn_logout_remove, 0);
4476         complete(&conn->conn_logout_comp);
4477
4478         iscsit_dec_conn_usage_count(conn);
4479         iscsit_stop_session(sess, 1, 1);
4480         iscsit_dec_session_usage_count(sess);
4481         target_put_session(sess->se_sess);
4482 }
4483
4484 static void iscsit_logout_post_handler_samecid(
4485         struct iscsi_conn *conn)
4486 {
4487         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4488         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4489
4490         atomic_set(&conn->conn_logout_remove, 0);
4491         complete(&conn->conn_logout_comp);
4492
4493         iscsit_cause_connection_reinstatement(conn, 1);
4494         iscsit_dec_conn_usage_count(conn);
4495 }
4496
4497 static void iscsit_logout_post_handler_diffcid(
4498         struct iscsi_conn *conn,
4499         u16 cid)
4500 {
4501         struct iscsi_conn *l_conn;
4502         struct iscsi_session *sess = conn->sess;
4503
4504         if (!sess)
4505                 return;
4506
4507         spin_lock_bh(&sess->conn_lock);
4508         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4509                 if (l_conn->cid == cid) {
4510                         iscsit_inc_conn_usage_count(l_conn);
4511                         break;
4512                 }
4513         }
4514         spin_unlock_bh(&sess->conn_lock);
4515
4516         if (!l_conn)
4517                 return;
4518
4519         if (l_conn->sock)
4520                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4521
4522         spin_lock_bh(&l_conn->state_lock);
4523         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4524         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4525         spin_unlock_bh(&l_conn->state_lock);
4526
4527         iscsit_cause_connection_reinstatement(l_conn, 1);
4528         iscsit_dec_conn_usage_count(l_conn);
4529 }
4530
4531 /*
4532  *      Return of 0 causes the TX thread to restart.
4533  */
4534 int iscsit_logout_post_handler(
4535         struct iscsi_cmd *cmd,
4536         struct iscsi_conn *conn)
4537 {
4538         int ret = 0;
4539
4540         switch (cmd->logout_reason) {
4541         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4542                 switch (cmd->logout_response) {
4543                 case ISCSI_LOGOUT_SUCCESS:
4544                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4545                 default:
4546                         iscsit_logout_post_handler_closesession(conn);
4547                         break;
4548                 }
4549                 ret = 0;
4550                 break;
4551         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4552                 if (conn->cid == cmd->logout_cid) {
4553                         switch (cmd->logout_response) {
4554                         case ISCSI_LOGOUT_SUCCESS:
4555                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4556                         default:
4557                                 iscsit_logout_post_handler_samecid(conn);
4558                                 break;
4559                         }
4560                         ret = 0;
4561                 } else {
4562                         switch (cmd->logout_response) {
4563                         case ISCSI_LOGOUT_SUCCESS:
4564                                 iscsit_logout_post_handler_diffcid(conn,
4565                                         cmd->logout_cid);
4566                                 break;
4567                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4568                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4569                         default:
4570                                 break;
4571                         }
4572                         ret = 1;
4573                 }
4574                 break;
4575         case ISCSI_LOGOUT_REASON_RECOVERY:
4576                 switch (cmd->logout_response) {
4577                 case ISCSI_LOGOUT_SUCCESS:
4578                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4579                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4580                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4581                 default:
4582                         break;
4583                 }
4584                 ret = 1;
4585                 break;
4586         default:
4587                 break;
4588
4589         }
4590         return ret;
4591 }
4592 EXPORT_SYMBOL(iscsit_logout_post_handler);
4593
4594 void iscsit_fail_session(struct iscsi_session *sess)
4595 {
4596         struct iscsi_conn *conn;
4597
4598         spin_lock_bh(&sess->conn_lock);
4599         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4600                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4601                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4602         }
4603         spin_unlock_bh(&sess->conn_lock);
4604
4605         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4606         sess->session_state = TARG_SESS_STATE_FAILED;
4607 }
4608
4609 int iscsit_free_session(struct iscsi_session *sess)
4610 {
4611         u16 conn_count = atomic_read(&sess->nconn);
4612         struct iscsi_conn *conn, *conn_tmp = NULL;
4613         int is_last;
4614
4615         spin_lock_bh(&sess->conn_lock);
4616         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4617
4618         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4619                         conn_list) {
4620                 if (conn_count == 0)
4621                         break;
4622
4623                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4624                         is_last = 1;
4625                 } else {
4626                         iscsit_inc_conn_usage_count(conn_tmp);
4627                         is_last = 0;
4628                 }
4629                 iscsit_inc_conn_usage_count(conn);
4630
4631                 spin_unlock_bh(&sess->conn_lock);
4632                 iscsit_cause_connection_reinstatement(conn, 1);
4633                 spin_lock_bh(&sess->conn_lock);
4634
4635                 iscsit_dec_conn_usage_count(conn);
4636                 if (is_last == 0)
4637                         iscsit_dec_conn_usage_count(conn_tmp);
4638
4639                 conn_count--;
4640         }
4641
4642         if (atomic_read(&sess->nconn)) {
4643                 spin_unlock_bh(&sess->conn_lock);
4644                 wait_for_completion(&sess->session_wait_comp);
4645         } else
4646                 spin_unlock_bh(&sess->conn_lock);
4647
4648         target_put_session(sess->se_sess);
4649         return 0;
4650 }
4651
4652 void iscsit_stop_session(
4653         struct iscsi_session *sess,
4654         int session_sleep,
4655         int connection_sleep)
4656 {
4657         u16 conn_count = atomic_read(&sess->nconn);
4658         struct iscsi_conn *conn, *conn_tmp = NULL;
4659         int is_last;
4660
4661         spin_lock_bh(&sess->conn_lock);
4662         if (session_sleep)
4663                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4664
4665         if (connection_sleep) {
4666                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4667                                 conn_list) {
4668                         if (conn_count == 0)
4669                                 break;
4670
4671                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4672                                 is_last = 1;
4673                         } else {
4674                                 iscsit_inc_conn_usage_count(conn_tmp);
4675                                 is_last = 0;
4676                         }
4677                         iscsit_inc_conn_usage_count(conn);
4678
4679                         spin_unlock_bh(&sess->conn_lock);
4680                         iscsit_cause_connection_reinstatement(conn, 1);
4681                         spin_lock_bh(&sess->conn_lock);
4682
4683                         iscsit_dec_conn_usage_count(conn);
4684                         if (is_last == 0)
4685                                 iscsit_dec_conn_usage_count(conn_tmp);
4686                         conn_count--;
4687                 }
4688         } else {
4689                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4690                         iscsit_cause_connection_reinstatement(conn, 0);
4691         }
4692
4693         if (session_sleep && atomic_read(&sess->nconn)) {
4694                 spin_unlock_bh(&sess->conn_lock);
4695                 wait_for_completion(&sess->session_wait_comp);
4696         } else
4697                 spin_unlock_bh(&sess->conn_lock);
4698 }
4699
4700 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4701 {
4702         struct iscsi_session *sess;
4703         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4704         struct se_session *se_sess, *se_sess_tmp;
4705         int session_count = 0;
4706
4707         spin_lock_bh(&se_tpg->session_lock);
4708         if (tpg->nsessions && !force) {
4709                 spin_unlock_bh(&se_tpg->session_lock);
4710                 return -1;
4711         }
4712
4713         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4714                         sess_list) {
4715                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4716
4717                 spin_lock(&sess->conn_lock);
4718                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4719                     atomic_read(&sess->session_logout) ||
4720                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4721                         spin_unlock(&sess->conn_lock);
4722                         continue;
4723                 }
4724                 atomic_set(&sess->session_reinstatement, 1);
4725                 spin_unlock(&sess->conn_lock);
4726                 spin_unlock_bh(&se_tpg->session_lock);
4727
4728                 iscsit_free_session(sess);
4729                 spin_lock_bh(&se_tpg->session_lock);
4730
4731                 session_count++;
4732         }
4733         spin_unlock_bh(&se_tpg->session_lock);
4734
4735         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4736                         " Group: %hu\n", session_count, tpg->tpgt);
4737         return 0;
4738 }
4739
4740 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4741 MODULE_VERSION("4.1.x");
4742 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4743 MODULE_LICENSE("GPL");
4744
4745 module_init(iscsi_target_init_module);
4746 module_exit(iscsi_target_cleanup_module);