drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31 #include <target/target_core_configfs.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 #include <target/iscsi/iscsi_transport.h>
  51
  52 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_SPINLOCK(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_qr_cache;
  65 struct kmem_cache *lio_dr_cache;
  66 struct kmem_cache *lio_ooo_cache;
  67 struct kmem_cache *lio_r2t_cache;
  68
  69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  70                         struct iscsi_scsi_req *, u32);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 146
 147         idr_preload(GFP_KERNEL);
 148         spin_lock(&tiqn_lock);
 149
 150         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 151         if (ret < 0) {
 152                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 153                 spin_unlock(&tiqn_lock);
 154                 idr_preload_end();
 155                 kfree(tiqn);
 156                 return ERR_PTR(ret);
 157         }
 158         tiqn->tiqn_index = ret;
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160
 161         spin_unlock(&tiqn_lock);
 162         idr_preload_end();
 163
 164         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 165
 166         return tiqn;
 167
 168 }
 169
 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 171 {
 172         /*
 173          * Wait for accesses to said struct iscsi_tiqn to end.
 174          */
 175         spin_lock(&tiqn->tiqn_state_lock);
 176         while (tiqn->tiqn_access_count != 0) {
 177                 spin_unlock(&tiqn->tiqn_state_lock);
 178                 msleep(10);
 179                 spin_lock(&tiqn->tiqn_state_lock);
 180         }
 181         spin_unlock(&tiqn->tiqn_state_lock);
 182 }
 183
 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 185 {
 186         /*
 187          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 188          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 189          * attempts to access this struct iscsi_tiqn will fail from both transport
 190          * fabric and control code paths.
 191          */
 192         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 193                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 194                 return;
 195         }
 196
 197         iscsit_wait_for_tiqn(tiqn);
 198
 199         spin_lock(&tiqn_lock);
 200         list_del(&tiqn->tiqn_list);
 201         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 202         spin_unlock(&tiqn_lock);
 203
 204         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 205                         tiqn->tiqn);
 206         kfree(tiqn);
 207 }
 208
 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 210 {
 211         int ret;
 212         /*
 213          * Determine if the network portal is accepting storage traffic.
 214          */
 215         spin_lock_bh(&np->np_thread_lock);
 216         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 217                 spin_unlock_bh(&np->np_thread_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&np->np_thread_lock);
 221         /*
 222          * Determine if the portal group is accepting storage traffic.
 223          */
 224         spin_lock_bh(&tpg->tpg_state_lock);
 225         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 226                 spin_unlock_bh(&tpg->tpg_state_lock);
 227                 return -1;
 228         }
 229         spin_unlock_bh(&tpg->tpg_state_lock);
 230
 231         /*
 232          * Here we serialize access across the TIQN+TPG Tuple.
 233          */
 234         ret = down_interruptible(&tpg->np_login_sem);
 235         if ((ret != 0) || signal_pending(current))
 236                 return -1;
 237
 238         spin_lock_bh(&tpg->tpg_state_lock);
 239         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 240                 spin_unlock_bh(&tpg->tpg_state_lock);
 241                 up(&tpg->np_login_sem);
 242                 return -1;
 243         }
 244         spin_unlock_bh(&tpg->tpg_state_lock);
 245
 246         return 0;
 247 }
 248
 249 void iscsit_login_kref_put(struct kref *kref)
 250 {
 251         struct iscsi_tpg_np *tpg_np = container_of(kref,
 252                                 struct iscsi_tpg_np, tpg_np_kref);
 253
 254         complete(&tpg_np->tpg_np_comp);
 255 }
 256
 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 258                        struct iscsi_tpg_np *tpg_np)
 259 {
 260         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 261
 262         up(&tpg->np_login_sem);
 263
 264         if (tpg_np)
 265                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 266
 267         if (tiqn)
 268                 iscsit_put_tiqn_for_login(tiqn);
 269
 270         return 0;
 271 }
 272
 273 bool iscsit_check_np_match(
 274         struct __kernel_sockaddr_storage *sockaddr,
 275         struct iscsi_np *np,
 276         int network_transport)
 277 {
 278         struct sockaddr_in *sock_in, *sock_in_e;
 279         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 280         bool ip_match = false;
 281         u16 port;
 282
 283         if (sockaddr->ss_family == AF_INET6) {
 284                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 288                             &sock_in6_e->sin6_addr.in6_u,
 289                             sizeof(struct in6_addr)))
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in6->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301         }
 302
 303         if ((ip_match == true) && (np->np_port == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 static struct iscsi_np *iscsit_get_np(
 311         struct __kernel_sockaddr_storage *sockaddr,
 312         int network_transport)
 313 {
 314         struct iscsi_np *np;
 315         bool match;
 316
 317         spin_lock_bh(&np_lock);
 318         list_for_each_entry(np, &g_np_list, np_list) {
 319                 spin_lock(&np->np_thread_lock);
 320                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 321                         spin_unlock(&np->np_thread_lock);
 322                         continue;
 323                 }
 324
 325                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 326                 if (match == true) {
 327                         /*
 328                          * Increment the np_exports reference count now to
 329                          * prevent iscsit_del_np() below from being called
 330                          * while iscsi_tpg_add_network_portal() is called.
 331                          */
 332                         np->np_exports++;
 333                         spin_unlock(&np->np_thread_lock);
 334                         spin_unlock_bh(&np_lock);
 335                         return np;
 336                 }
 337                 spin_unlock(&np->np_thread_lock);
 338         }
 339         spin_unlock_bh(&np_lock);
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct __kernel_sockaddr_storage *sockaddr,
 346         char *ip_str,
 347         int network_transport)
 348 {
 349         struct sockaddr_in *sock_in;
 350         struct sockaddr_in6 *sock_in6;
 351         struct iscsi_np *np;
 352         int ret;
 353         /*
 354          * Locate the existing struct iscsi_np if already active..
 355          */
 356         np = iscsit_get_np(sockaddr, network_transport);
 357         if (np)
 358                 return np;
 359
 360         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 361         if (!np) {
 362                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 363                 return ERR_PTR(-ENOMEM);
 364         }
 365
 366         np->np_flags |= NPF_IP_NETWORK;
 367         if (sockaddr->ss_family == AF_INET6) {
 368                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 369                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 370                 np->np_port = ntohs(sock_in6->sin6_port);
 371         } else {
 372                 sock_in = (struct sockaddr_in *)sockaddr;
 373                 sprintf(np->np_ip, "%s", ip_str);
 374                 np->np_port = ntohs(sock_in->sin_port);
 375         }
 376
 377         np->np_network_transport = network_transport;
 378         spin_lock_init(&np->np_thread_lock);
 379         init_completion(&np->np_restart_comp);
 380         INIT_LIST_HEAD(&np->np_list);
 381
 382         ret = iscsi_target_setup_login_socket(np, sockaddr);
 383         if (ret != 0) {
 384                 kfree(np);
 385                 return ERR_PTR(ret);
 386         }
 387
 388         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 389         if (IS_ERR(np->np_thread)) {
 390                 pr_err("Unable to create kthread: iscsi_np\n");
 391                 ret = PTR_ERR(np->np_thread);
 392                 kfree(np);
 393                 return ERR_PTR(ret);
 394         }
 395         /*
 396          * Increment the np_exports reference count now to prevent
 397          * iscsit_del_np() below from being run while a new call to
 398          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 399          * active.  We don't need to hold np->np_thread_lock at this
 400          * point because iscsi_np has not been added to g_np_list yet.
 401          */
 402         np->np_exports = 1;
 403
 404         spin_lock_bh(&np_lock);
 405         list_add_tail(&np->np_list, &g_np_list);
 406         spin_unlock_bh(&np_lock);
 407
 408         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 409                 np->np_ip, np->np_port, np->np_transport->name);
 410
 411         return np;
 412 }
 413
 414 int iscsit_reset_np_thread(
 415         struct iscsi_np *np,
 416         struct iscsi_tpg_np *tpg_np,
 417         struct iscsi_portal_group *tpg,
 418         bool shutdown)
 419 {
 420         spin_lock_bh(&np->np_thread_lock);
 421         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 422                 spin_unlock_bh(&np->np_thread_lock);
 423                 return 0;
 424         }
 425         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 426
 427         if (np->np_thread) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 send_sig(SIGINT, np->np_thread, 1);
 430                 wait_for_completion(&np->np_restart_comp);
 431                 spin_lock_bh(&np->np_thread_lock);
 432         }
 433         spin_unlock_bh(&np->np_thread_lock);
 434
 435         if (tpg_np && shutdown) {
 436                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 437
 438                 wait_for_completion(&tpg_np->tpg_np_comp);
 439         }
 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                 np->np_thread = NULL;
 469         }
 470
 471         np->np_transport->iscsit_free_np(np);
 472
 473         spin_lock_bh(&np_lock);
 474         list_del(&np->np_list);
 475         spin_unlock_bh(&np_lock);
 476
 477         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 478                 np->np_ip, np->np_port, np->np_transport->name);
 479
 480         iscsit_put_transport(np->np_transport);
 481         kfree(np);
 482         return 0;
 483 }
 484
 485 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 486 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 487
 488 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 489 {
 490         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 491         return 0;
 492 }
 493
 494 static struct iscsit_transport iscsi_target_transport = {
 495         .name                   = "iSCSI/TCP",
 496         .transport_type         = ISCSI_TCP,
 497         .owner                  = NULL,
 498         .iscsit_setup_np        = iscsit_setup_np,
 499         .iscsit_accept_np       = iscsit_accept_np,
 500         .iscsit_free_np         = iscsit_free_np,
 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_qr_cache = kmem_cache_create("lio_qr_cache",
 542                         sizeof(struct iscsi_queue_req),
 543                         __alignof__(struct iscsi_queue_req), 0, NULL);
 544         if (!lio_qr_cache) {
 545                 pr_err("nable to kmem_cache_create() for"
 546                                 " lio_qr_cache\n");
 547                 goto ts_out2;
 548         }
 549
 550         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 551                         sizeof(struct iscsi_datain_req),
 552                         __alignof__(struct iscsi_datain_req), 0, NULL);
 553         if (!lio_dr_cache) {
 554                 pr_err("Unable to kmem_cache_create() for"
 555                                 " lio_dr_cache\n");
 556                 goto qr_out;
 557         }
 558
 559         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 560                         sizeof(struct iscsi_ooo_cmdsn),
 561                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 562         if (!lio_ooo_cache) {
 563                 pr_err("Unable to kmem_cache_create() for"
 564                                 " lio_ooo_cache\n");
 565                 goto dr_out;
 566         }
 567
 568         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 569                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 570                         0, NULL);
 571         if (!lio_r2t_cache) {
 572                 pr_err("Unable to kmem_cache_create() for"
 573                                 " lio_r2t_cache\n");
 574                 goto ooo_out;
 575         }
 576
 577         iscsit_register_transport(&iscsi_target_transport);
 578
 579         if (iscsit_load_discovery_tpg() < 0)
 580                 goto r2t_out;
 581
 582         return ret;
 583 r2t_out:
 584         kmem_cache_destroy(lio_r2t_cache);
 585 ooo_out:
 586         kmem_cache_destroy(lio_ooo_cache);
 587 dr_out:
 588         kmem_cache_destroy(lio_dr_cache);
 589 qr_out:
 590         kmem_cache_destroy(lio_qr_cache);
 591 ts_out2:
 592         iscsi_deallocate_thread_sets();
 593 ts_out1:
 594         iscsi_thread_set_free();
 595 configfs_out:
 596         iscsi_target_deregister_configfs();
 597 out:
 598         kfree(iscsit_global);
 599         return -ENOMEM;
 600 }
 601
 602 static void __exit iscsi_target_cleanup_module(void)
 603 {
 604         iscsi_deallocate_thread_sets();
 605         iscsi_thread_set_free();
 606         iscsit_release_discovery_tpg();
 607         iscsit_unregister_transport(&iscsi_target_transport);
 608         kmem_cache_destroy(lio_qr_cache);
 609         kmem_cache_destroy(lio_dr_cache);
 610         kmem_cache_destroy(lio_ooo_cache);
 611         kmem_cache_destroy(lio_r2t_cache);
 612
 613         iscsi_target_deregister_configfs();
 614
 615         kfree(iscsit_global);
 616 }
 617
 618 static int iscsit_add_reject(
 619         struct iscsi_conn *conn,
 620         u8 reason,
 621         unsigned char *buf)
 622 {
 623         struct iscsi_cmd *cmd;
 624
 625         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 626         if (!cmd)
 627                 return -1;
 628
 629         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 630         cmd->reject_reason = reason;
 631
 632         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 633         if (!cmd->buf_ptr) {
 634                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 635                 iscsit_free_cmd(cmd, false);
 636                 return -1;
 637         }
 638
 639         spin_lock_bh(&conn->cmd_lock);
 640         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 641         spin_unlock_bh(&conn->cmd_lock);
 642
 643         cmd->i_state = ISTATE_SEND_REJECT;
 644         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 645
 646         return -1;
 647 }
 648
 649 static int iscsit_add_reject_from_cmd(
 650         struct iscsi_cmd *cmd,
 651         u8 reason,
 652         bool add_to_conn,
 653         unsigned char *buf)
 654 {
 655         struct iscsi_conn *conn;
 656
 657         if (!cmd->conn) {
 658                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 659                                 cmd->init_task_tag);
 660                 return -1;
 661         }
 662         conn = cmd->conn;
 663
 664         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 665         cmd->reject_reason = reason;
 666
 667         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 668         if (!cmd->buf_ptr) {
 669                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 670                 iscsit_free_cmd(cmd, false);
 671                 return -1;
 672         }
 673
 674         if (add_to_conn) {
 675                 spin_lock_bh(&conn->cmd_lock);
 676                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 677                 spin_unlock_bh(&conn->cmd_lock);
 678         }
 679
 680         cmd->i_state = ISTATE_SEND_REJECT;
 681         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 682         /*
 683          * Perform the kref_put now if se_cmd has already been setup by
 684          * scsit_setup_scsi_cmd()
 685          */
 686         if (cmd->se_cmd.se_tfo != NULL) {
 687                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 688                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 689         }
 690         return -1;
 691 }
 692
 693 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 694                                  unsigned char *buf)
 695 {
 696         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 697 }
 698
 699 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 700 {
 701         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 702 }
 703
 704 /*
 705  * Map some portion of the allocated scatterlist to an iovec, suitable for
 706  * kernel sockets to copy data in/out.
 707  */
 708 static int iscsit_map_iovec(
 709         struct iscsi_cmd *cmd,
 710         struct kvec *iov,
 711         u32 data_offset,
 712         u32 data_length)
 713 {
 714         u32 i = 0;
 715         struct scatterlist *sg;
 716         unsigned int page_off;
 717
 718         /*
 719          * We know each entry in t_data_sg contains a page.
 720          */
 721         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 722         page_off = (data_offset % PAGE_SIZE);
 723
 724         cmd->first_data_sg = sg;
 725         cmd->first_data_sg_off = page_off;
 726
 727         while (data_length) {
 728                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 729
 730                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 731                 iov[i].iov_len = cur_len;
 732
 733                 data_length -= cur_len;
 734                 page_off = 0;
 735                 sg = sg_next(sg);
 736                 i++;
 737         }
 738
 739         cmd->kmapped_nents = i;
 740
 741         return i;
 742 }
 743
 744 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 745 {
 746         u32 i;
 747         struct scatterlist *sg;
 748
 749         sg = cmd->first_data_sg;
 750
 751         for (i = 0; i < cmd->kmapped_nents; i++)
 752                 kunmap(sg_page(&sg[i]));
 753 }
 754
 755 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 756 {
 757         LIST_HEAD(ack_list);
 758         struct iscsi_cmd *cmd, *cmd_p;
 759
 760         conn->exp_statsn = exp_statsn;
 761
 762         if (conn->sess->sess_ops->RDMAExtensions)
 763                 return;
 764
 765         spin_lock_bh(&conn->cmd_lock);
 766         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 767                 spin_lock(&cmd->istate_lock);
 768                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 769                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 770                         cmd->i_state = ISTATE_REMOVE;
 771                         spin_unlock(&cmd->istate_lock);
 772                         list_move_tail(&cmd->i_conn_node, &ack_list);
 773                         continue;
 774                 }
 775                 spin_unlock(&cmd->istate_lock);
 776         }
 777         spin_unlock_bh(&conn->cmd_lock);
 778
 779         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 780                 list_del(&cmd->i_conn_node);
 781                 iscsit_free_cmd(cmd, false);
 782         }
 783 }
 784
 785 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 786 {
 787         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 788
 789         iov_count += ISCSI_IOV_DATA_BUFFER;
 790
 791         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 792         if (!cmd->iov_data) {
 793                 pr_err("Unable to allocate cmd->iov_data\n");
 794                 return -ENOMEM;
 795         }
 796
 797         cmd->orig_iov_data_count = iov_count;
 798         return 0;
 799 }
 800
 801 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 802                           unsigned char *buf)
 803 {
 804         int data_direction, payload_length;
 805         struct iscsi_scsi_req *hdr;
 806         int iscsi_task_attr;
 807         int sam_task_attr;
 808
 809         atomic_long_inc(&conn->sess->cmd_pdus);
 810
 811         hdr                     = (struct iscsi_scsi_req *) buf;
 812         payload_length          = ntoh24(hdr->dlength);
 813
 814         /* FIXME; Add checks for AdditionalHeaderSegment */
 815
 816         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 817             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 818                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 819                                 " not set. Bad iSCSI Initiator.\n");
 820                 return iscsit_add_reject_cmd(cmd,
 821                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 822         }
 823
 824         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 825              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 826                 /*
 827                  * From RFC-3720 Section 10.3.1:
 828                  *
 829                  * "Either or both of R and W MAY be 1 when either the
 830                  *  Expected Data Transfer Length and/or Bidirectional Read
 831                  *  Expected Data Transfer Length are 0"
 832                  *
 833                  * For this case, go ahead and clear the unnecssary bits
 834                  * to avoid any confusion with ->data_direction.
 835                  */
 836                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 837                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 838
 839                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 840                         " set when Expected Data Transfer Length is 0 for"
 841                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 842         }
 843
 844         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 845             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 846                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 847                         " MUST be set if Expected Data Transfer Length is not 0."
 848                         " Bad iSCSI Initiator\n");
 849                 return iscsit_add_reject_cmd(cmd,
 850                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 851         }
 852
 853         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 854             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 855                 pr_err("Bidirectional operations not supported!\n");
 856                 return iscsit_add_reject_cmd(cmd,
 857                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 858         }
 859
 860         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 861                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 862                                 " Scsi Command PDU.\n");
 863                 return iscsit_add_reject_cmd(cmd,
 864                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 865         }
 866
 867         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 868                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 869                         " protocol error.\n", payload_length);
 870                 return iscsit_add_reject_cmd(cmd,
 871                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 872         }
 873
 874         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 875             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 876                 pr_err("Expected Data Transfer Length and Length of"
 877                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 878                         " bit is not set protocol error\n");
 879                 return iscsit_add_reject_cmd(cmd,
 880                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 881         }
 882
 883         if (payload_length > be32_to_cpu(hdr->data_length)) {
 884                 pr_err("DataSegmentLength: %u is greater than"
 885                         " EDTL: %u, protocol error.\n", payload_length,
 886                                 hdr->data_length);
 887                 return iscsit_add_reject_cmd(cmd,
 888                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 889         }
 890
 891         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 892                 pr_err("DataSegmentLength: %u is greater than"
 893                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 894                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 895                 return iscsit_add_reject_cmd(cmd,
 896                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 897         }
 898
 899         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 900                 pr_err("DataSegmentLength: %u is greater than"
 901                         " FirstBurstLength: %u, protocol error.\n",
 902                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 903                 return iscsit_add_reject_cmd(cmd,
 904                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 905         }
 906
 907         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 908                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 909                           DMA_NONE;
 910
 911         cmd->data_direction = data_direction;
 912         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 913         /*
 914          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 915          */
 916         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 917             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 918                 sam_task_attr = MSG_SIMPLE_TAG;
 919         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 920                 sam_task_attr = MSG_ORDERED_TAG;
 921         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 922                 sam_task_attr = MSG_HEAD_TAG;
 923         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 924                 sam_task_attr = MSG_ACA_TAG;
 925         else {
 926                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 927                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 928                 sam_task_attr = MSG_SIMPLE_TAG;
 929         }
 930
 931         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 932         cmd->i_state            = ISTATE_NEW_CMD;
 933         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 934         cmd->immediate_data     = (payload_length) ? 1 : 0;
 935         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 936                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 937         if (cmd->unsolicited_data)
 938                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 939
 940         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 941         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 942                 spin_lock_bh(&conn->sess->ttt_lock);
 943                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 944                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 945                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 946                 spin_unlock_bh(&conn->sess->ttt_lock);
 947         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 948                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 949         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 950         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 951         cmd->first_burst_len    = payload_length;
 952
 953         if (!conn->sess->sess_ops->RDMAExtensions &&
 954              cmd->data_direction == DMA_FROM_DEVICE) {
 955                 struct iscsi_datain_req *dr;
 956
 957                 dr = iscsit_allocate_datain_req();
 958                 if (!dr)
 959                         return iscsit_add_reject_cmd(cmd,
 960                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 961
 962                 iscsit_attach_datain_req(cmd, dr);
 963         }
 964
 965         /*
 966          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 967          */
 968         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 969                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 970                         cmd->data_direction, sam_task_attr,
 971                         cmd->sense_buffer + 2);
 972
 973         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 974                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 975                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
 976                 conn->cid);
 977
 978         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
 979
 980         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 981                                                      scsilun_to_int(&hdr->lun));
 982         if (cmd->sense_reason)
 983                 goto attach_cmd;
 984
 985         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 986         if (cmd->sense_reason) {
 987                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
 988                         return iscsit_add_reject_cmd(cmd,
 989                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 990                 }
 991
 992                 goto attach_cmd;
 993         }
 994
 995         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
 996                 return iscsit_add_reject_cmd(cmd,
 997                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 998         }
 999
1000 attach_cmd:
1001         spin_lock_bh(&conn->cmd_lock);
1002         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1003         spin_unlock_bh(&conn->cmd_lock);
1004         /*
1005          * Check if we need to delay processing because of ALUA
1006          * Active/NonOptimized primary access state..
1007          */
1008         core_alua_check_nonop_delay(&cmd->se_cmd);
1009
1010         return 0;
1011 }
1012 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1013
1014 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1015 {
1016         iscsit_set_dataout_sequence_values(cmd);
1017
1018         spin_lock_bh(&cmd->dataout_timeout_lock);
1019         iscsit_start_dataout_timer(cmd, cmd->conn);
1020         spin_unlock_bh(&cmd->dataout_timeout_lock);
1021 }
1022 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1023
1024 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1025                             struct iscsi_scsi_req *hdr)
1026 {
1027         int cmdsn_ret = 0;
1028         /*
1029          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1030          * the Immediate Bit is not set, and no Immediate
1031          * Data is attached.
1032          *
1033          * A PDU/CmdSN carrying Immediate Data can only
1034          * be processed after the DataCRC has passed.
1035          * If the DataCRC fails, the CmdSN MUST NOT
1036          * be acknowledged. (See below)
1037          */
1038         if (!cmd->immediate_data) {
1039                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1040                                         (unsigned char *)hdr, hdr->cmdsn);
1041                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1042                         return -1;
1043                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1044                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1045                         return 0;
1046                 }
1047         }
1048
1049         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1050
1051         /*
1052          * If no Immediate Data is attached, it's OK to return now.
1053          */
1054         if (!cmd->immediate_data) {
1055                 if (!cmd->sense_reason && cmd->unsolicited_data)
1056                         iscsit_set_unsoliticed_dataout(cmd);
1057                 if (!cmd->sense_reason)
1058                         return 0;
1059
1060                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1061                 return 0;
1062         }
1063
1064         /*
1065          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1066          * execution.  These exceptions are processed in CmdSN order using
1067          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1068          */
1069         if (cmd->sense_reason) {
1070                 if (cmd->reject_reason)
1071                         return 0;
1072
1073                 return 1;
1074         }
1075         /*
1076          * Call directly into transport_generic_new_cmd() to perform
1077          * the backend memory allocation.
1078          */
1079         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1080         if (cmd->sense_reason)
1081                 return 1;
1082
1083         return 0;
1084 }
1085 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1086
1087 static int
1088 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1089                           bool dump_payload)
1090 {
1091         struct iscsi_conn *conn = cmd->conn;
1092         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1093         /*
1094          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1095          */
1096         if (dump_payload == true)
1097                 goto after_immediate_data;
1098
1099         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1100                                         cmd->first_burst_len);
1101 after_immediate_data:
1102         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1103                 /*
1104                  * A PDU/CmdSN carrying Immediate Data passed
1105                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1106                  * Immediate Bit is not set.
1107                  */
1108                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1109                                         (unsigned char *)hdr, hdr->cmdsn);
1110                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1111                         return -1;
1112
1113                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1114                         int rc;
1115
1116                         rc = iscsit_dump_data_payload(cmd->conn,
1117                                                       cmd->first_burst_len, 1);
1118                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1119                         return rc;
1120                 } else if (cmd->unsolicited_data)
1121                         iscsit_set_unsoliticed_dataout(cmd);
1122
1123         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1124                 /*
1125                  * Immediate Data failed DataCRC and ERL>=1,
1126                  * silently drop this PDU and let the initiator
1127                  * plug the CmdSN gap.
1128                  *
1129                  * FIXME: Send Unsolicited NOPIN with reserved
1130                  * TTT here to help the initiator figure out
1131                  * the missing CmdSN, although they should be
1132                  * intelligent enough to determine the missing
1133                  * CmdSN and issue a retry to plug the sequence.
1134                  */
1135                 cmd->i_state = ISTATE_REMOVE;
1136                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1137         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1138                 return -1;
1139
1140         return 0;
1141 }
1142
1143 static int
1144 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1145                            unsigned char *buf)
1146 {
1147         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1148         int rc, immed_data;
1149         bool dump_payload = false;
1150
1151         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1152         if (rc < 0)
1153                 return 0;
1154         /*
1155          * Allocation iovecs needed for struct socket operations for
1156          * traditional iSCSI block I/O.
1157          */
1158         if (iscsit_allocate_iovecs(cmd) < 0) {
1159                 return iscsit_add_reject_cmd(cmd,
1160                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1161         }
1162         immed_data = cmd->immediate_data;
1163
1164         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1165         if (rc < 0)
1166                 return rc;
1167         else if (rc > 0)
1168                 dump_payload = true;
1169
1170         if (!immed_data)
1171                 return 0;
1172
1173         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1174 }
1175
1176 static u32 iscsit_do_crypto_hash_sg(
1177         struct hash_desc *hash,
1178         struct iscsi_cmd *cmd,
1179         u32 data_offset,
1180         u32 data_length,
1181         u32 padding,
1182         u8 *pad_bytes)
1183 {
1184         u32 data_crc;
1185         u32 i;
1186         struct scatterlist *sg;
1187         unsigned int page_off;
1188
1189         crypto_hash_init(hash);
1190
1191         sg = cmd->first_data_sg;
1192         page_off = cmd->first_data_sg_off;
1193
1194         i = 0;
1195         while (data_length) {
1196                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1197
1198                 crypto_hash_update(hash, &sg[i], cur_len);
1199
1200                 data_length -= cur_len;
1201                 page_off = 0;
1202                 i++;
1203         }
1204
1205         if (padding) {
1206                 struct scatterlist pad_sg;
1207
1208                 sg_init_one(&pad_sg, pad_bytes, padding);
1209                 crypto_hash_update(hash, &pad_sg, padding);
1210         }
1211         crypto_hash_final(hash, (u8 *) &data_crc);
1212
1213         return data_crc;
1214 }
1215
1216 static void iscsit_do_crypto_hash_buf(
1217         struct hash_desc *hash,
1218         const void *buf,
1219         u32 payload_length,
1220         u32 padding,
1221         u8 *pad_bytes,
1222         u8 *data_crc)
1223 {
1224         struct scatterlist sg;
1225
1226         crypto_hash_init(hash);
1227
1228         sg_init_one(&sg, buf, payload_length);
1229         crypto_hash_update(hash, &sg, payload_length);
1230
1231         if (padding) {
1232                 sg_init_one(&sg, pad_bytes, padding);
1233                 crypto_hash_update(hash, &sg, padding);
1234         }
1235         crypto_hash_final(hash, data_crc);
1236 }
1237
1238 int
1239 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1240                           struct iscsi_cmd **out_cmd)
1241 {
1242         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1243         struct iscsi_cmd *cmd = NULL;
1244         struct se_cmd *se_cmd;
1245         u32 payload_length = ntoh24(hdr->dlength);
1246         int rc;
1247
1248         if (!payload_length) {
1249                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1250                 return 0;
1251         }
1252
1253         /* iSCSI write */
1254         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1255
1256         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1257                 pr_err("DataSegmentLength: %u is greater than"
1258                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1259                         conn->conn_ops->MaxXmitDataSegmentLength);
1260                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1261                                          buf);
1262         }
1263
1264         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1265                         payload_length);
1266         if (!cmd)
1267                 return 0;
1268
1269         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1270                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1271                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1272                 payload_length, conn->cid);
1273
1274         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1275                 pr_err("Command ITT: 0x%08x received DataOUT after"
1276                         " last DataOUT received, dumping payload\n",
1277                         cmd->init_task_tag);
1278                 return iscsit_dump_data_payload(conn, payload_length, 1);
1279         }
1280
1281         if (cmd->data_direction != DMA_TO_DEVICE) {
1282                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1283                         " NON-WRITE command.\n", cmd->init_task_tag);
1284                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1285         }
1286         se_cmd = &cmd->se_cmd;
1287         iscsit_mod_dataout_timer(cmd);
1288
1289         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1290                 pr_err("DataOut Offset: %u, Length %u greater than"
1291                         " iSCSI Command EDTL %u, protocol error.\n",
1292                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1293                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1294         }
1295
1296         if (cmd->unsolicited_data) {
1297                 int dump_unsolicited_data = 0;
1298
1299                 if (conn->sess->sess_ops->InitialR2T) {
1300                         pr_err("Received unexpected unsolicited data"
1301                                 " while InitialR2T=Yes, protocol error.\n");
1302                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1303                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1304                         return -1;
1305                 }
1306                 /*
1307                  * Special case for dealing with Unsolicited DataOUT
1308                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1309                  * failures;
1310                  */
1311
1312                 /* Something's amiss if we're not in WRITE_PENDING state... */
1313                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1314                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1315                         dump_unsolicited_data = 1;
1316
1317                 if (dump_unsolicited_data) {
1318                         /*
1319                          * Check if a delayed TASK_ABORTED status needs to
1320                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1321                          * received with the unsolicitied data out.
1322                          */
1323                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1324                                 iscsit_stop_dataout_timer(cmd);
1325
1326                         transport_check_aborted_status(se_cmd,
1327                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1328                         return iscsit_dump_data_payload(conn, payload_length, 1);
1329                 }
1330         } else {
1331                 /*
1332                  * For the normal solicited data path:
1333                  *
1334                  * Check for a delayed TASK_ABORTED status and dump any
1335                  * incoming data out payload if one exists.  Also, when the
1336                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1337                  * data out sequence, we decrement outstanding_r2ts.  Once
1338                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1339                  * TASK_ABORTED status.
1340                  */
1341                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1342                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1343                                 if (--cmd->outstanding_r2ts < 1) {
1344                                         iscsit_stop_dataout_timer(cmd);
1345                                         transport_check_aborted_status(
1346                                                         se_cmd, 1);
1347                                 }
1348
1349                         return iscsit_dump_data_payload(conn, payload_length, 1);
1350                 }
1351         }
1352         /*
1353          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1354          * within-command recovery checks before receiving the payload.
1355          */
1356         rc = iscsit_check_pre_dataout(cmd, buf);
1357         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1358                 return 0;
1359         else if (rc == DATAOUT_CANNOT_RECOVER)
1360                 return -1;
1361
1362         *out_cmd = cmd;
1363         return 0;
1364 }
1365 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1366
1367 static int
1368 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1369                    struct iscsi_data *hdr)
1370 {
1371         struct kvec *iov;
1372         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1373         u32 payload_length = ntoh24(hdr->dlength);
1374         int iov_ret, data_crc_failed = 0;
1375
1376         rx_size += payload_length;
1377         iov = &cmd->iov_data[0];
1378
1379         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1380                                    payload_length);
1381         if (iov_ret < 0)
1382                 return -1;
1383
1384         iov_count += iov_ret;
1385
1386         padding = ((-payload_length) & 3);
1387         if (padding != 0) {
1388                 iov[iov_count].iov_base = cmd->pad_bytes;
1389                 iov[iov_count++].iov_len = padding;
1390                 rx_size += padding;
1391                 pr_debug("Receiving %u padding bytes.\n", padding);
1392         }
1393
1394         if (conn->conn_ops->DataDigest) {
1395                 iov[iov_count].iov_base = &checksum;
1396                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1397                 rx_size += ISCSI_CRC_LEN;
1398         }
1399
1400         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1401
1402         iscsit_unmap_iovec(cmd);
1403
1404         if (rx_got != rx_size)
1405                 return -1;
1406
1407         if (conn->conn_ops->DataDigest) {
1408                 u32 data_crc;
1409
1410                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1411                                                     be32_to_cpu(hdr->offset),
1412                                                     payload_length, padding,
1413                                                     cmd->pad_bytes);
1414
1415                 if (checksum != data_crc) {
1416                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1417                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1418                                 " does not match computed 0x%08x\n",
1419                                 hdr->itt, hdr->offset, payload_length,
1420                                 hdr->datasn, checksum, data_crc);
1421                         data_crc_failed = 1;
1422                 } else {
1423                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1424                                 " %u bytes of Data Out\n", checksum,
1425                                 payload_length);
1426                 }
1427         }
1428
1429         return data_crc_failed;
1430 }
1431
1432 int
1433 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1434                              bool data_crc_failed)
1435 {
1436         struct iscsi_conn *conn = cmd->conn;
1437         int rc, ooo_cmdsn;
1438         /*
1439          * Increment post receive data and CRC values or perform
1440          * within-command recovery.
1441          */
1442         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1443         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1444                 return 0;
1445         else if (rc == DATAOUT_SEND_R2T) {
1446                 iscsit_set_dataout_sequence_values(cmd);
1447                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1448         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1449                 /*
1450                  * Handle extra special case for out of order
1451                  * Unsolicited Data Out.
1452                  */
1453                 spin_lock_bh(&cmd->istate_lock);
1454                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1455                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1456                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1457                 spin_unlock_bh(&cmd->istate_lock);
1458
1459                 iscsit_stop_dataout_timer(cmd);
1460                 if (ooo_cmdsn)
1461                         return 0;
1462                 target_execute_cmd(&cmd->se_cmd);
1463                 return 0;
1464         } else /* DATAOUT_CANNOT_RECOVER */
1465                 return -1;
1466
1467         return 0;
1468 }
1469 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1470
1471 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1472 {
1473         struct iscsi_cmd *cmd = NULL;
1474         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1475         int rc;
1476         bool data_crc_failed = false;
1477
1478         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1479         if (rc < 0)
1480                 return 0;
1481         else if (!cmd)
1482                 return 0;
1483
1484         rc = iscsit_get_dataout(conn, cmd, hdr);
1485         if (rc < 0)
1486                 return rc;
1487         else if (rc > 0)
1488                 data_crc_failed = true;
1489
1490         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1491 }
1492
1493 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1494                          struct iscsi_nopout *hdr)
1495 {
1496         u32 payload_length = ntoh24(hdr->dlength);
1497
1498         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1499                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1500                         " not set, protocol error.\n");
1501                 if (!cmd)
1502                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1503                                                  (unsigned char *)hdr);
1504
1505                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1506                                          (unsigned char *)hdr);
1507         }
1508
1509         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1510                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1511                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1512                         " error.\n", payload_length,
1513                         conn->conn_ops->MaxXmitDataSegmentLength);
1514                 if (!cmd)
1515                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1516                                                  (unsigned char *)hdr);
1517
1518                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1519                                          (unsigned char *)hdr);
1520         }
1521
1522         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1523                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1524                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1525                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1526                 payload_length);
1527         /*
1528          * This is not a response to a Unsolicited NopIN, which means
1529          * it can either be a NOPOUT ping request (with a valid ITT),
1530          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1531          * Either way, make sure we allocate an struct iscsi_cmd, as both
1532          * can contain ping data.
1533          */
1534         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1535                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1536                 cmd->i_state            = ISTATE_SEND_NOPIN;
1537                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1538                                                 1 : 0);
1539                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1540                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1541                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1542                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1543                 cmd->data_direction     = DMA_NONE;
1544         }
1545
1546         return 0;
1547 }
1548 EXPORT_SYMBOL(iscsit_setup_nop_out);
1549
1550 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1551                            struct iscsi_nopout *hdr)
1552 {
1553         struct iscsi_cmd *cmd_p = NULL;
1554         int cmdsn_ret = 0;
1555         /*
1556          * Initiator is expecting a NopIN ping reply..
1557          */
1558         if (hdr->itt != RESERVED_ITT) {
1559                 BUG_ON(!cmd);
1560
1561                 spin_lock_bh(&conn->cmd_lock);
1562                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1563                 spin_unlock_bh(&conn->cmd_lock);
1564
1565                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1566
1567                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1568                         iscsit_add_cmd_to_response_queue(cmd, conn,
1569                                                          cmd->i_state);
1570                         return 0;
1571                 }
1572
1573                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1574                                 (unsigned char *)hdr, hdr->cmdsn);
1575                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1576                         return 0;
1577                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1578                         return -1;
1579
1580                 return 0;
1581         }
1582         /*
1583          * This was a response to a unsolicited NOPIN ping.
1584          */
1585         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1586                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1587                 if (!cmd_p)
1588                         return -EINVAL;
1589
1590                 iscsit_stop_nopin_response_timer(conn);
1591
1592                 cmd_p->i_state = ISTATE_REMOVE;
1593                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1594
1595                 iscsit_start_nopin_timer(conn);
1596                 return 0;
1597         }
1598         /*
1599          * Otherwise, initiator is not expecting a NOPIN is response.
1600          * Just ignore for now.
1601          */
1602         return 0;
1603 }
1604 EXPORT_SYMBOL(iscsit_process_nop_out);
1605
1606 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1607                                  unsigned char *buf)
1608 {
1609         unsigned char *ping_data = NULL;
1610         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1611         struct kvec *iov = NULL;
1612         u32 payload_length = ntoh24(hdr->dlength);
1613         int ret;
1614
1615         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1616         if (ret < 0)
1617                 return 0;
1618         /*
1619          * Handle NOP-OUT payload for traditional iSCSI sockets
1620          */
1621         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1622                 u32 checksum, data_crc, padding = 0;
1623                 int niov = 0, rx_got, rx_size = payload_length;
1624
1625                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1626                 if (!ping_data) {
1627                         pr_err("Unable to allocate memory for"
1628                                 " NOPOUT ping data.\n");
1629                         ret = -1;
1630                         goto out;
1631                 }
1632
1633                 iov = &cmd->iov_misc[0];
1634                 iov[niov].iov_base      = ping_data;
1635                 iov[niov++].iov_len     = payload_length;
1636
1637                 padding = ((-payload_length) & 3);
1638                 if (padding != 0) {
1639                         pr_debug("Receiving %u additional bytes"
1640                                 " for padding.\n", padding);
1641                         iov[niov].iov_base      = &cmd->pad_bytes;
1642                         iov[niov++].iov_len     = padding;
1643                         rx_size += padding;
1644                 }
1645                 if (conn->conn_ops->DataDigest) {
1646                         iov[niov].iov_base      = &checksum;
1647                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1648                         rx_size += ISCSI_CRC_LEN;
1649                 }
1650
1651                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1652                 if (rx_got != rx_size) {
1653                         ret = -1;
1654                         goto out;
1655                 }
1656
1657                 if (conn->conn_ops->DataDigest) {
1658                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1659                                         ping_data, payload_length,
1660                                         padding, cmd->pad_bytes,
1661                                         (u8 *)&data_crc);
1662
1663                         if (checksum != data_crc) {
1664                                 pr_err("Ping data CRC32C DataDigest"
1665                                 " 0x%08x does not match computed 0x%08x\n",
1666                                         checksum, data_crc);
1667                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1668                                         pr_err("Unable to recover from"
1669                                         " NOPOUT Ping DataCRC failure while in"
1670                                                 " ERL=0.\n");
1671                                         ret = -1;
1672                                         goto out;
1673                                 } else {
1674                                         /*
1675                                          * Silently drop this PDU and let the
1676                                          * initiator plug the CmdSN gap.
1677                                          */
1678                                         pr_debug("Dropping NOPOUT"
1679                                         " Command CmdSN: 0x%08x due to"
1680                                         " DataCRC error.\n", hdr->cmdsn);
1681                                         ret = 0;
1682                                         goto out;
1683                                 }
1684                         } else {
1685                                 pr_debug("Got CRC32C DataDigest"
1686                                 " 0x%08x for %u bytes of ping data.\n",
1687                                         checksum, payload_length);
1688                         }
1689                 }
1690
1691                 ping_data[payload_length] = '\0';
1692                 /*
1693                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1694                  */
1695                 cmd->buf_ptr = ping_data;
1696                 cmd->buf_ptr_size = payload_length;
1697
1698                 pr_debug("Got %u bytes of NOPOUT ping"
1699                         " data.\n", payload_length);
1700                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1701         }
1702
1703         return iscsit_process_nop_out(conn, cmd, hdr);
1704 out:
1705         if (cmd)
1706                 iscsit_free_cmd(cmd, false);
1707
1708         kfree(ping_data);
1709         return ret;
1710 }
1711
1712 int
1713 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1714                            unsigned char *buf)
1715 {
1716         struct se_tmr_req *se_tmr;
1717         struct iscsi_tmr_req *tmr_req;
1718         struct iscsi_tm *hdr;
1719         int out_of_order_cmdsn = 0, ret;
1720         bool sess_ref = false;
1721         u8 function;
1722
1723         hdr                     = (struct iscsi_tm *) buf;
1724         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1725         function = hdr->flags;
1726
1727         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1728                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1729                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1730                 hdr->rtt, hdr->refcmdsn, conn->cid);
1731
1732         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1733             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1734              hdr->rtt != RESERVED_ITT)) {
1735                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1736                 hdr->rtt = RESERVED_ITT;
1737         }
1738
1739         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1740                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1741                 pr_err("Task Management Request TASK_REASSIGN not"
1742                         " issued as immediate command, bad iSCSI Initiator"
1743                                 "implementation\n");
1744                 return iscsit_add_reject_cmd(cmd,
1745                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1746         }
1747         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1748             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1749                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1750
1751         cmd->data_direction = DMA_NONE;
1752
1753         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1754         if (!cmd->tmr_req) {
1755                 pr_err("Unable to allocate memory for"
1756                         " Task Management command!\n");
1757                 return iscsit_add_reject_cmd(cmd,
1758                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1759                                              buf);
1760         }
1761
1762         /*
1763          * TASK_REASSIGN for ERL=2 / connection stays inside of
1764          * LIO-Target $FABRIC_MOD
1765          */
1766         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1767
1768                 u8 tcm_function;
1769                 int ret;
1770
1771                 transport_init_se_cmd(&cmd->se_cmd,
1772                                       &lio_target_fabric_configfs->tf_ops,
1773                                       conn->sess->se_sess, 0, DMA_NONE,
1774                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1775
1776                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1777                 sess_ref = true;
1778
1779                 switch (function) {
1780                 case ISCSI_TM_FUNC_ABORT_TASK:
1781                         tcm_function = TMR_ABORT_TASK;
1782                         break;
1783                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1784                         tcm_function = TMR_ABORT_TASK_SET;
1785                         break;
1786                 case ISCSI_TM_FUNC_CLEAR_ACA:
1787                         tcm_function = TMR_CLEAR_ACA;
1788                         break;
1789                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1790                         tcm_function = TMR_CLEAR_TASK_SET;
1791                         break;
1792                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1793                         tcm_function = TMR_LUN_RESET;
1794                         break;
1795                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1796                         tcm_function = TMR_TARGET_WARM_RESET;
1797                         break;
1798                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1799                         tcm_function = TMR_TARGET_COLD_RESET;
1800                         break;
1801                 default:
1802                         pr_err("Unknown iSCSI TMR Function:"
1803                                " 0x%02x\n", function);
1804                         return iscsit_add_reject_cmd(cmd,
1805                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1806                 }
1807
1808                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1809                                          tcm_function, GFP_KERNEL);
1810                 if (ret < 0)
1811                         return iscsit_add_reject_cmd(cmd,
1812                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1813
1814                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1815         }
1816
1817         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1818         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1819         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1820         cmd->init_task_tag      = hdr->itt;
1821         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1822         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1823         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1824         se_tmr                  = cmd->se_cmd.se_tmr_req;
1825         tmr_req                 = cmd->tmr_req;
1826         /*
1827          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1828          */
1829         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1830                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1831                                                scsilun_to_int(&hdr->lun));
1832                 if (ret < 0) {
1833                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1834                         goto attach;
1835                 }
1836         }
1837
1838         switch (function) {
1839         case ISCSI_TM_FUNC_ABORT_TASK:
1840                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1841                 if (se_tmr->response)
1842                         goto attach;
1843                 break;
1844         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1845         case ISCSI_TM_FUNC_CLEAR_ACA:
1846         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1847         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1848                 break;
1849         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1850                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1851                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1852                         goto attach;
1853                 }
1854                 break;
1855         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1856                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1857                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1858                         goto attach;
1859                 }
1860                 break;
1861         case ISCSI_TM_FUNC_TASK_REASSIGN:
1862                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1863                 /*
1864                  * Perform sanity checks on the ExpDataSN only if the
1865                  * TASK_REASSIGN was successful.
1866                  */
1867                 if (se_tmr->response)
1868                         break;
1869
1870                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1871                         return iscsit_add_reject_cmd(cmd,
1872                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1873                 break;
1874         default:
1875                 pr_err("Unknown TMR function: 0x%02x, protocol"
1876                         " error.\n", function);
1877                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1878                 goto attach;
1879         }
1880
1881         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1882             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1883                 se_tmr->call_transport = 1;
1884 attach:
1885         spin_lock_bh(&conn->cmd_lock);
1886         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1887         spin_unlock_bh(&conn->cmd_lock);
1888
1889         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1890                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1891                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1892                         out_of_order_cmdsn = 1;
1893                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1894                         return 0;
1895                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1896                         return -1;
1897         }
1898         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1899
1900         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1901                 return 0;
1902         /*
1903          * Found the referenced task, send to transport for processing.
1904          */
1905         if (se_tmr->call_transport)
1906                 return transport_generic_handle_tmr(&cmd->se_cmd);
1907
1908         /*
1909          * Could not find the referenced LUN, task, or Task Management
1910          * command not authorized or supported.  Change state and
1911          * let the tx_thread send the response.
1912          *
1913          * For connection recovery, this is also the default action for
1914          * TMR TASK_REASSIGN.
1915          */
1916         if (sess_ref) {
1917                 pr_debug("Handle TMR, using sess_ref=true check\n");
1918                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1919         }
1920
1921         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1922         return 0;
1923 }
1924 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1925
1926 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1927 int
1928 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1929                       struct iscsi_text *hdr)
1930 {
1931         u32 payload_length = ntoh24(hdr->dlength);
1932
1933         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1934                 pr_err("Unable to accept text parameter length: %u"
1935                         "greater than MaxXmitDataSegmentLength %u.\n",
1936                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1937                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1938                                          (unsigned char *)hdr);
1939         }
1940
1941         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1942              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1943                 pr_err("Multi sequence text commands currently not supported\n");
1944                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1945                                         (unsigned char *)hdr);
1946         }
1947
1948         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1949                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1950                 hdr->exp_statsn, payload_length);
1951
1952         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1953         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1954         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1955         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1956         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1957         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1958         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1959         cmd->data_direction     = DMA_NONE;
1960
1961         return 0;
1962 }
1963 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1964
1965 int
1966 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967                         struct iscsi_text *hdr)
1968 {
1969         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1970         int cmdsn_ret;
1971
1972         if (!text_in) {
1973                 pr_err("Unable to locate text_in buffer for sendtargets"
1974                        " discovery\n");
1975                 goto reject;
1976         }
1977         if (strncmp("SendTargets", text_in, 11) != 0) {
1978                 pr_err("Received Text Data that is not"
1979                         " SendTargets, cannot continue.\n");
1980                 goto reject;
1981         }
1982         text_ptr = strchr(text_in, '=');
1983         if (!text_ptr) {
1984                 pr_err("No \"=\" separator found in Text Data,"
1985                         "  cannot continue.\n");
1986                 goto reject;
1987         }
1988         if (!strncmp("=All", text_ptr, 4)) {
1989                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
1990         } else if (!strncmp("=iqn.", text_ptr, 5) ||
1991                    !strncmp("=eui.", text_ptr, 5)) {
1992                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
1993         } else {
1994                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
1995                 goto reject;
1996         }
1997
1998         spin_lock_bh(&conn->cmd_lock);
1999         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2000         spin_unlock_bh(&conn->cmd_lock);
2001
2002         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2003
2004         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2005                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2006                                 (unsigned char *)hdr, hdr->cmdsn);
2007                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2008                         return -1;
2009
2010                 return 0;
2011         }
2012
2013         return iscsit_execute_cmd(cmd, 0);
2014
2015 reject:
2016         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2017                                  (unsigned char *)hdr);
2018 }
2019 EXPORT_SYMBOL(iscsit_process_text_cmd);
2020
2021 static int
2022 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2023                        unsigned char *buf)
2024 {
2025         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2026         char *text_in = NULL;
2027         u32 payload_length = ntoh24(hdr->dlength);
2028         int rx_size, rc;
2029
2030         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2031         if (rc < 0)
2032                 return 0;
2033
2034         rx_size = payload_length;
2035         if (payload_length) {
2036                 u32 checksum = 0, data_crc = 0;
2037                 u32 padding = 0, pad_bytes = 0;
2038                 int niov = 0, rx_got;
2039                 struct kvec iov[3];
2040
2041                 text_in = kzalloc(payload_length, GFP_KERNEL);
2042                 if (!text_in) {
2043                         pr_err("Unable to allocate memory for"
2044                                 " incoming text parameters\n");
2045                         goto reject;
2046                 }
2047                 cmd->text_in_ptr = text_in;
2048
2049                 memset(iov, 0, 3 * sizeof(struct kvec));
2050                 iov[niov].iov_base      = text_in;
2051                 iov[niov++].iov_len     = payload_length;
2052
2053                 padding = ((-payload_length) & 3);
2054                 if (padding != 0) {
2055                         iov[niov].iov_base = &pad_bytes;
2056                         iov[niov++].iov_len  = padding;
2057                         rx_size += padding;
2058                         pr_debug("Receiving %u additional bytes"
2059                                         " for padding.\n", padding);
2060                 }
2061                 if (conn->conn_ops->DataDigest) {
2062                         iov[niov].iov_base      = &checksum;
2063                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2064                         rx_size += ISCSI_CRC_LEN;
2065                 }
2066
2067                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2068                 if (rx_got != rx_size)
2069                         goto reject;
2070
2071                 if (conn->conn_ops->DataDigest) {
2072                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2073                                         text_in, payload_length,
2074                                         padding, (u8 *)&pad_bytes,
2075                                         (u8 *)&data_crc);
2076
2077                         if (checksum != data_crc) {
2078                                 pr_err("Text data CRC32C DataDigest"
2079                                         " 0x%08x does not match computed"
2080                                         " 0x%08x\n", checksum, data_crc);
2081                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2082                                         pr_err("Unable to recover from"
2083                                         " Text Data digest failure while in"
2084                                                 " ERL=0.\n");
2085                                         goto reject;
2086                                 } else {
2087                                         /*
2088                                          * Silently drop this PDU and let the
2089                                          * initiator plug the CmdSN gap.
2090                                          */
2091                                         pr_debug("Dropping Text"
2092                                         " Command CmdSN: 0x%08x due to"
2093                                         " DataCRC error.\n", hdr->cmdsn);
2094                                         kfree(text_in);
2095                                         return 0;
2096                                 }
2097                         } else {
2098                                 pr_debug("Got CRC32C DataDigest"
2099                                         " 0x%08x for %u bytes of text data.\n",
2100                                                 checksum, payload_length);
2101                         }
2102                 }
2103                 text_in[payload_length - 1] = '\0';
2104                 pr_debug("Successfully read %d bytes of text"
2105                                 " data.\n", payload_length);
2106         }
2107
2108         return iscsit_process_text_cmd(conn, cmd, hdr);
2109
2110 reject:
2111         kfree(cmd->text_in_ptr);
2112         cmd->text_in_ptr = NULL;
2113         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2114 }
2115 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2116
2117 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2118 {
2119         struct iscsi_conn *conn_p;
2120         struct iscsi_session *sess = conn->sess;
2121
2122         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2123                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2124
2125         atomic_set(&sess->session_logout, 1);
2126         atomic_set(&conn->conn_logout_remove, 1);
2127         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2128
2129         iscsit_inc_conn_usage_count(conn);
2130         iscsit_inc_session_usage_count(sess);
2131
2132         spin_lock_bh(&sess->conn_lock);
2133         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2134                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2135                         continue;
2136
2137                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2138                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2139         }
2140         spin_unlock_bh(&sess->conn_lock);
2141
2142         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2143
2144         return 0;
2145 }
2146
2147 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2148 {
2149         struct iscsi_conn *l_conn;
2150         struct iscsi_session *sess = conn->sess;
2151
2152         pr_debug("Received logout request CLOSECONNECTION for CID:"
2153                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2154
2155         /*
2156          * A Logout Request with a CLOSECONNECTION reason code for a CID
2157          * can arrive on a connection with a differing CID.
2158          */
2159         if (conn->cid == cmd->logout_cid) {
2160                 spin_lock_bh(&conn->state_lock);
2161                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2162                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2163
2164                 atomic_set(&conn->conn_logout_remove, 1);
2165                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2166                 iscsit_inc_conn_usage_count(conn);
2167
2168                 spin_unlock_bh(&conn->state_lock);
2169         } else {
2170                 /*
2171                  * Handle all different cid CLOSECONNECTION requests in
2172                  * iscsit_logout_post_handler_diffcid() as to give enough
2173                  * time for any non immediate command's CmdSN to be
2174                  * acknowledged on the connection in question.
2175                  *
2176                  * Here we simply make sure the CID is still around.
2177                  */
2178                 l_conn = iscsit_get_conn_from_cid(sess,
2179                                 cmd->logout_cid);
2180                 if (!l_conn) {
2181                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2182                         iscsit_add_cmd_to_response_queue(cmd, conn,
2183                                         cmd->i_state);
2184                         return 0;
2185                 }
2186
2187                 iscsit_dec_conn_usage_count(l_conn);
2188         }
2189
2190         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2191
2192         return 0;
2193 }
2194
2195 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2196 {
2197         struct iscsi_session *sess = conn->sess;
2198
2199         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2200                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2201
2202         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2203                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2204                         " while ERL!=2.\n");
2205                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2206                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2207                 return 0;
2208         }
2209
2210         if (conn->cid == cmd->logout_cid) {
2211                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2212                         " with CID: %hu on CID: %hu, implementation error.\n",
2213                                 cmd->logout_cid, conn->cid);
2214                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2215                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2216                 return 0;
2217         }
2218
2219         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2220
2221         return 0;
2222 }
2223
2224 int
2225 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2226                         unsigned char *buf)
2227 {
2228         int cmdsn_ret, logout_remove = 0;
2229         u8 reason_code = 0;
2230         struct iscsi_logout *hdr;
2231         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2232
2233         hdr                     = (struct iscsi_logout *) buf;
2234         reason_code             = (hdr->flags & 0x7f);
2235
2236         if (tiqn) {
2237                 spin_lock(&tiqn->logout_stats.lock);
2238                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2239                         tiqn->logout_stats.normal_logouts++;
2240                 else
2241                         tiqn->logout_stats.abnormal_logouts++;
2242                 spin_unlock(&tiqn->logout_stats.lock);
2243         }
2244
2245         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2246                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2247                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2248                 hdr->cid, conn->cid);
2249
2250         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2251                 pr_err("Received logout request on connection that"
2252                         " is not in logged in state, ignoring request.\n");
2253                 iscsit_free_cmd(cmd, false);
2254                 return 0;
2255         }
2256
2257         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2258         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2259         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2260         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2261         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2262         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2263         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2264         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2265         cmd->logout_reason      = reason_code;
2266         cmd->data_direction     = DMA_NONE;
2267
2268         /*
2269          * We need to sleep in these cases (by returning 1) until the Logout
2270          * Response gets sent in the tx thread.
2271          */
2272         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2273            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2274             be16_to_cpu(hdr->cid) == conn->cid))
2275                 logout_remove = 1;
2276
2277         spin_lock_bh(&conn->cmd_lock);
2278         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2279         spin_unlock_bh(&conn->cmd_lock);
2280
2281         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2282                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2283
2284         /*
2285          * Immediate commands are executed, well, immediately.
2286          * Non-Immediate Logout Commands are executed in CmdSN order.
2287          */
2288         if (cmd->immediate_cmd) {
2289                 int ret = iscsit_execute_cmd(cmd, 0);
2290
2291                 if (ret < 0)
2292                         return ret;
2293         } else {
2294                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2295                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2296                         logout_remove = 0;
2297                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2298                         return -1;
2299         }
2300
2301         return logout_remove;
2302 }
2303 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2304
2305 static int iscsit_handle_snack(
2306         struct iscsi_conn *conn,
2307         unsigned char *buf)
2308 {
2309         struct iscsi_snack *hdr;
2310
2311         hdr                     = (struct iscsi_snack *) buf;
2312         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2313
2314         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2315                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2316                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2317                         hdr->begrun, hdr->runlength, conn->cid);
2318
2319         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2320                 pr_err("Initiator sent SNACK request while in"
2321                         " ErrorRecoveryLevel=0.\n");
2322                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2323                                          buf);
2324         }
2325         /*
2326          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2327          * call from inside iscsi_send_recovery_datain_or_r2t().
2328          */
2329         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2330         case 0:
2331                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2332                         hdr->itt,
2333                         be32_to_cpu(hdr->ttt),
2334                         be32_to_cpu(hdr->begrun),
2335                         be32_to_cpu(hdr->runlength));
2336         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2337                 return iscsit_handle_status_snack(conn, hdr->itt,
2338                         be32_to_cpu(hdr->ttt),
2339                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2340         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2341                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2342                         be32_to_cpu(hdr->begrun),
2343                         be32_to_cpu(hdr->runlength));
2344         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2345                 /* FIXME: Support R-Data SNACK */
2346                 pr_err("R-Data SNACK Not Supported.\n");
2347                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2348                                          buf);
2349         default:
2350                 pr_err("Unknown SNACK type 0x%02x, protocol"
2351                         " error.\n", hdr->flags & 0x0f);
2352                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2353                                          buf);
2354         }
2355
2356         return 0;
2357 }
2358
2359 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2360 {
2361         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2362             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2363                 wait_for_completion_interruptible_timeout(
2364                                         &conn->rx_half_close_comp,
2365                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2366         }
2367 }
2368
2369 static int iscsit_handle_immediate_data(
2370         struct iscsi_cmd *cmd,
2371         struct iscsi_scsi_req *hdr,
2372         u32 length)
2373 {
2374         int iov_ret, rx_got = 0, rx_size = 0;
2375         u32 checksum, iov_count = 0, padding = 0;
2376         struct iscsi_conn *conn = cmd->conn;
2377         struct kvec *iov;
2378
2379         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2380         if (iov_ret < 0)
2381                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2382
2383         rx_size = length;
2384         iov_count = iov_ret;
2385         iov = &cmd->iov_data[0];
2386
2387         padding = ((-length) & 3);
2388         if (padding != 0) {
2389                 iov[iov_count].iov_base = cmd->pad_bytes;
2390                 iov[iov_count++].iov_len = padding;
2391                 rx_size += padding;
2392         }
2393
2394         if (conn->conn_ops->DataDigest) {
2395                 iov[iov_count].iov_base         = &checksum;
2396                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2397                 rx_size += ISCSI_CRC_LEN;
2398         }
2399
2400         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2401
2402         iscsit_unmap_iovec(cmd);
2403
2404         if (rx_got != rx_size) {
2405                 iscsit_rx_thread_wait_for_tcp(conn);
2406                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2407         }
2408
2409         if (conn->conn_ops->DataDigest) {
2410                 u32 data_crc;
2411
2412                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2413                                                     cmd->write_data_done, length, padding,
2414                                                     cmd->pad_bytes);
2415
2416                 if (checksum != data_crc) {
2417                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2418                                 " does not match computed 0x%08x\n", checksum,
2419                                 data_crc);
2420
2421                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2422                                 pr_err("Unable to recover from"
2423                                         " Immediate Data digest failure while"
2424                                         " in ERL=0.\n");
2425                                 iscsit_reject_cmd(cmd,
2426                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2427                                                 (unsigned char *)hdr);
2428                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2429                         } else {
2430                                 iscsit_reject_cmd(cmd,
2431                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2432                                                 (unsigned char *)hdr);
2433                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2434                         }
2435                 } else {
2436                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2437                                 " %u bytes of Immediate Data\n", checksum,
2438                                 length);
2439                 }
2440         }
2441
2442         cmd->write_data_done += length;
2443
2444         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2445                 spin_lock_bh(&cmd->istate_lock);
2446                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2447                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2448                 spin_unlock_bh(&cmd->istate_lock);
2449         }
2450
2451         return IMMEDIATE_DATA_NORMAL_OPERATION;
2452 }
2453
2454 /*
2455  *      Called with sess->conn_lock held.
2456  */
2457 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2458         with active network interface */
2459 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2460 {
2461         struct iscsi_cmd *cmd;
2462         struct iscsi_conn *conn_p;
2463
2464         /*
2465          * Only send a Asynchronous Message on connections whos network
2466          * interface is still functional.
2467          */
2468         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2469                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2470                         iscsit_inc_conn_usage_count(conn_p);
2471                         break;
2472                 }
2473         }
2474
2475         if (!conn_p)
2476                 return;
2477
2478         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2479         if (!cmd) {
2480                 iscsit_dec_conn_usage_count(conn_p);
2481                 return;
2482         }
2483
2484         cmd->logout_cid = conn->cid;
2485         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2486         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2487
2488         spin_lock_bh(&conn_p->cmd_lock);
2489         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2490         spin_unlock_bh(&conn_p->cmd_lock);
2491
2492         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2493         iscsit_dec_conn_usage_count(conn_p);
2494 }
2495
2496 static int iscsit_send_conn_drop_async_message(
2497         struct iscsi_cmd *cmd,
2498         struct iscsi_conn *conn)
2499 {
2500         struct iscsi_async *hdr;
2501
2502         cmd->tx_size = ISCSI_HDR_LEN;
2503         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2504
2505         hdr                     = (struct iscsi_async *) cmd->pdu;
2506         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2507         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2508         cmd->init_task_tag      = RESERVED_ITT;
2509         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2510         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2511         cmd->stat_sn            = conn->stat_sn++;
2512         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2513         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2514         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2515         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2516         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2517         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2518         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2519
2520         if (conn->conn_ops->HeaderDigest) {
2521                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2522
2523                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2524                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2525
2526                 cmd->tx_size += ISCSI_CRC_LEN;
2527                 pr_debug("Attaching CRC32C HeaderDigest to"
2528                         " Async Message 0x%08x\n", *header_digest);
2529         }
2530
2531         cmd->iov_misc[0].iov_base       = cmd->pdu;
2532         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2533         cmd->iov_misc_count             = 1;
2534
2535         pr_debug("Sending Connection Dropped Async Message StatSN:"
2536                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2537                         cmd->logout_cid, conn->cid);
2538         return 0;
2539 }
2540
2541 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2542 {
2543         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2544             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2545                 wait_for_completion_interruptible_timeout(
2546                                         &conn->tx_half_close_comp,
2547                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2548         }
2549 }
2550
2551 static void
2552 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2553                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2554                         bool set_statsn)
2555 {
2556         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2557         hdr->flags              = datain->flags;
2558         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2559                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2560                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2561                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2562                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2563                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2564                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2565                 }
2566         }
2567         hton24(hdr->dlength, datain->length);
2568         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2569                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2570                                 (struct scsi_lun *)&hdr->lun);
2571         else
2572                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2573
2574         hdr->itt                = cmd->init_task_tag;
2575
2576         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2577                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2578         else
2579                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2580         if (set_statsn)
2581                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2582         else
2583                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2584
2585         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2586         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2587         hdr->datasn             = cpu_to_be32(datain->data_sn);
2588         hdr->offset             = cpu_to_be32(datain->offset);
2589
2590         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2591                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2592                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2593                 ntohl(hdr->offset), datain->length, conn->cid);
2594 }
2595
2596 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2597 {
2598         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2599         struct iscsi_datain datain;
2600         struct iscsi_datain_req *dr;
2601         struct kvec *iov;
2602         u32 iov_count = 0, tx_size = 0;
2603         int eodr = 0, ret, iov_ret;
2604         bool set_statsn = false;
2605
2606         memset(&datain, 0, sizeof(struct iscsi_datain));
2607         dr = iscsit_get_datain_values(cmd, &datain);
2608         if (!dr) {
2609                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2610                                 cmd->init_task_tag);
2611                 return -1;
2612         }
2613         /*
2614          * Be paranoid and double check the logic for now.
2615          */
2616         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2617                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2618                         " datain.length: %u exceeds cmd->data_length: %u\n",
2619                         cmd->init_task_tag, datain.offset, datain.length,
2620                         cmd->se_cmd.data_length);
2621                 return -1;
2622         }
2623
2624         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2625         /*
2626          * Special case for successfully execution w/ both DATAIN
2627          * and Sense Data.
2628          */
2629         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2630             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2631                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2632         else {
2633                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2634                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2635                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2636                         cmd->stat_sn = conn->stat_sn++;
2637                         set_statsn = true;
2638                 } else if (dr->dr_complete ==
2639                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2640                         set_statsn = true;
2641         }
2642
2643         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2644
2645         iov = &cmd->iov_data[0];
2646         iov[iov_count].iov_base = cmd->pdu;
2647         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2648         tx_size += ISCSI_HDR_LEN;
2649
2650         if (conn->conn_ops->HeaderDigest) {
2651                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2652
2653                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2654                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2655
2656                 iov[0].iov_len += ISCSI_CRC_LEN;
2657                 tx_size += ISCSI_CRC_LEN;
2658
2659                 pr_debug("Attaching CRC32 HeaderDigest"
2660                         " for DataIN PDU 0x%08x\n", *header_digest);
2661         }
2662
2663         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2664                                 datain.offset, datain.length);
2665         if (iov_ret < 0)
2666                 return -1;
2667
2668         iov_count += iov_ret;
2669         tx_size += datain.length;
2670
2671         cmd->padding = ((-datain.length) & 3);
2672         if (cmd->padding) {
2673                 iov[iov_count].iov_base         = cmd->pad_bytes;
2674                 iov[iov_count++].iov_len        = cmd->padding;
2675                 tx_size += cmd->padding;
2676
2677                 pr_debug("Attaching %u padding bytes\n",
2678                                 cmd->padding);
2679         }
2680         if (conn->conn_ops->DataDigest) {
2681                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2682                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2683
2684                 iov[iov_count].iov_base = &cmd->data_crc;
2685                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2686                 tx_size += ISCSI_CRC_LEN;
2687
2688                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2689                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2690         }
2691
2692         cmd->iov_data_count = iov_count;
2693         cmd->tx_size = tx_size;
2694
2695         /* sendpage is preferred but can't insert markers */
2696         if (!conn->conn_ops->IFMarker)
2697                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2698         else
2699                 ret = iscsit_send_tx_data(cmd, conn, 0);
2700
2701         iscsit_unmap_iovec(cmd);
2702
2703         if (ret < 0) {
2704                 iscsit_tx_thread_wait_for_tcp(conn);
2705                 return ret;
2706         }
2707
2708         if (dr->dr_complete) {
2709                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2710                                 2 : 1;
2711                 iscsit_free_datain_req(cmd, dr);
2712         }
2713
2714         return eodr;
2715 }
2716
2717 int
2718 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2719                         struct iscsi_logout_rsp *hdr)
2720 {
2721         struct iscsi_conn *logout_conn = NULL;
2722         struct iscsi_conn_recovery *cr = NULL;
2723         struct iscsi_session *sess = conn->sess;
2724         /*
2725          * The actual shutting down of Sessions and/or Connections
2726          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2727          * is done in scsi_logout_post_handler().
2728          */
2729         switch (cmd->logout_reason) {
2730         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2731                 pr_debug("iSCSI session logout successful, setting"
2732                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2733                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2734                 break;
2735         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2736                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2737                         break;
2738                 /*
2739                  * For CLOSECONNECTION logout requests carrying
2740                  * a matching logout CID -> local CID, the reference
2741                  * for the local CID will have been incremented in
2742                  * iscsi_logout_closeconnection().
2743                  *
2744                  * For CLOSECONNECTION logout requests carrying
2745                  * a different CID than the connection it arrived
2746                  * on, the connection responding to cmd->logout_cid
2747                  * is stopped in iscsit_logout_post_handler_diffcid().
2748                  */
2749
2750                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2751                         " successful.\n", cmd->logout_cid, conn->cid);
2752                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2753                 break;
2754         case ISCSI_LOGOUT_REASON_RECOVERY:
2755                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2756                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2757                         break;
2758                 /*
2759                  * If the connection is still active from our point of view
2760                  * force connection recovery to occur.
2761                  */
2762                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2763                                 cmd->logout_cid);
2764                 if (logout_conn) {
2765                         iscsit_connection_reinstatement_rcfr(logout_conn);
2766                         iscsit_dec_conn_usage_count(logout_conn);
2767                 }
2768
2769                 cr = iscsit_get_inactive_connection_recovery_entry(
2770                                 conn->sess, cmd->logout_cid);
2771                 if (!cr) {
2772                         pr_err("Unable to locate CID: %hu for"
2773                         " REMOVECONNFORRECOVERY Logout Request.\n",
2774                                 cmd->logout_cid);
2775                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2776                         break;
2777                 }
2778
2779                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2780
2781                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2782                         " for recovery for CID: %hu on CID: %hu successful.\n",
2783                                 cmd->logout_cid, conn->cid);
2784                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2785                 break;
2786         default:
2787                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2788                                 cmd->logout_reason);
2789                 return -1;
2790         }
2791
2792         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2793         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2794         hdr->response           = cmd->logout_response;
2795         hdr->itt                = cmd->init_task_tag;
2796         cmd->stat_sn            = conn->stat_sn++;
2797         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2798
2799         iscsit_increment_maxcmdsn(cmd, conn->sess);
2800         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2801         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2802
2803         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2804                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2805                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2806                 cmd->logout_cid, conn->cid);
2807
2808         return 0;
2809 }
2810 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2811
2812 static int
2813 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2814 {
2815         struct kvec *iov;
2816         int niov = 0, tx_size, rc;
2817
2818         rc = iscsit_build_logout_rsp(cmd, conn,
2819                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2820         if (rc < 0)
2821                 return rc;
2822
2823         tx_size = ISCSI_HDR_LEN;
2824         iov = &cmd->iov_misc[0];
2825         iov[niov].iov_base      = cmd->pdu;
2826         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2827
2828         if (conn->conn_ops->HeaderDigest) {
2829                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2830
2831                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2832                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2833
2834                 iov[0].iov_len += ISCSI_CRC_LEN;
2835                 tx_size += ISCSI_CRC_LEN;
2836                 pr_debug("Attaching CRC32C HeaderDigest to"
2837                         " Logout Response 0x%08x\n", *header_digest);
2838         }
2839         cmd->iov_misc_count = niov;
2840         cmd->tx_size = tx_size;
2841
2842         return 0;
2843 }
2844
2845 void
2846 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2847                        struct iscsi_nopin *hdr, bool nopout_response)
2848 {
2849         hdr->opcode             = ISCSI_OP_NOOP_IN;
2850         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2851         hton24(hdr->dlength, cmd->buf_ptr_size);
2852         if (nopout_response)
2853                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2854         hdr->itt                = cmd->init_task_tag;
2855         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2856         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2857                                   conn->stat_sn;
2858         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2859
2860         if (nopout_response)
2861                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2862
2863         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2864         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2865
2866         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2867                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2868                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2869                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2870 }
2871 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2872
2873 /*
2874  *      Unsolicited NOPIN, either requesting a response or not.
2875  */
2876 static int iscsit_send_unsolicited_nopin(
2877         struct iscsi_cmd *cmd,
2878         struct iscsi_conn *conn,
2879         int want_response)
2880 {
2881         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2882         int tx_size = ISCSI_HDR_LEN, ret;
2883
2884         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2885
2886         if (conn->conn_ops->HeaderDigest) {
2887                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2888
2889                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2890                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2891
2892                 tx_size += ISCSI_CRC_LEN;
2893                 pr_debug("Attaching CRC32C HeaderDigest to"
2894                         " NopIN 0x%08x\n", *header_digest);
2895         }
2896
2897         cmd->iov_misc[0].iov_base       = cmd->pdu;
2898         cmd->iov_misc[0].iov_len        = tx_size;
2899         cmd->iov_misc_count     = 1;
2900         cmd->tx_size            = tx_size;
2901
2902         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2903                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2904
2905         ret = iscsit_send_tx_data(cmd, conn, 1);
2906         if (ret < 0) {
2907                 iscsit_tx_thread_wait_for_tcp(conn);
2908                 return ret;
2909         }
2910
2911         spin_lock_bh(&cmd->istate_lock);
2912         cmd->i_state = want_response ?
2913                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2914         spin_unlock_bh(&cmd->istate_lock);
2915
2916         return 0;
2917 }
2918
2919 static int
2920 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2921 {
2922         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2923         struct kvec *iov;
2924         u32 padding = 0;
2925         int niov = 0, tx_size;
2926
2927         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2928
2929         tx_size = ISCSI_HDR_LEN;
2930         iov = &cmd->iov_misc[0];
2931         iov[niov].iov_base      = cmd->pdu;
2932         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2933
2934         if (conn->conn_ops->HeaderDigest) {
2935                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2936
2937                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2938                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2939
2940                 iov[0].iov_len += ISCSI_CRC_LEN;
2941                 tx_size += ISCSI_CRC_LEN;
2942                 pr_debug("Attaching CRC32C HeaderDigest"
2943                         " to NopIn 0x%08x\n", *header_digest);
2944         }
2945
2946         /*
2947          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2948          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2949          */
2950         if (cmd->buf_ptr_size) {
2951                 iov[niov].iov_base      = cmd->buf_ptr;
2952                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2953                 tx_size += cmd->buf_ptr_size;
2954
2955                 pr_debug("Echoing back %u bytes of ping"
2956                         " data.\n", cmd->buf_ptr_size);
2957
2958                 padding = ((-cmd->buf_ptr_size) & 3);
2959                 if (padding != 0) {
2960                         iov[niov].iov_base = &cmd->pad_bytes;
2961                         iov[niov++].iov_len = padding;
2962                         tx_size += padding;
2963                         pr_debug("Attaching %u additional"
2964                                 " padding bytes.\n", padding);
2965                 }
2966                 if (conn->conn_ops->DataDigest) {
2967                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2968                                 cmd->buf_ptr, cmd->buf_ptr_size,
2969                                 padding, (u8 *)&cmd->pad_bytes,
2970                                 (u8 *)&cmd->data_crc);
2971
2972                         iov[niov].iov_base = &cmd->data_crc;
2973                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2974                         tx_size += ISCSI_CRC_LEN;
2975                         pr_debug("Attached DataDigest for %u"
2976                                 " bytes of ping data, CRC 0x%08x\n",
2977                                 cmd->buf_ptr_size, cmd->data_crc);
2978                 }
2979         }
2980
2981         cmd->iov_misc_count = niov;
2982         cmd->tx_size = tx_size;
2983
2984         return 0;
2985 }
2986
2987 static int iscsit_send_r2t(
2988         struct iscsi_cmd *cmd,
2989         struct iscsi_conn *conn)
2990 {
2991         int tx_size = 0;
2992         struct iscsi_r2t *r2t;
2993         struct iscsi_r2t_rsp *hdr;
2994         int ret;
2995
2996         r2t = iscsit_get_r2t_from_list(cmd);
2997         if (!r2t)
2998                 return -1;
2999
3000         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3001         memset(hdr, 0, ISCSI_HDR_LEN);
3002         hdr->opcode             = ISCSI_OP_R2T;
3003         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3004         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3005                         (struct scsi_lun *)&hdr->lun);
3006         hdr->itt                = cmd->init_task_tag;
3007         spin_lock_bh(&conn->sess->ttt_lock);
3008         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3009         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3010                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3011         spin_unlock_bh(&conn->sess->ttt_lock);
3012         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3013         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3014         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3015         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3016         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3017         hdr->data_offset        = cpu_to_be32(r2t->offset);
3018         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3019
3020         cmd->iov_misc[0].iov_base       = cmd->pdu;
3021         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3022         tx_size += ISCSI_HDR_LEN;
3023
3024         if (conn->conn_ops->HeaderDigest) {
3025                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3026
3027                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3028                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3029
3030                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3031                 tx_size += ISCSI_CRC_LEN;
3032                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3033                         " PDU 0x%08x\n", *header_digest);
3034         }
3035
3036         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3037                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3038                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3039                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3040                         r2t->offset, r2t->xfer_len, conn->cid);
3041
3042         cmd->iov_misc_count = 1;
3043         cmd->tx_size = tx_size;
3044
3045         spin_lock_bh(&cmd->r2t_lock);
3046         r2t->sent_r2t = 1;
3047         spin_unlock_bh(&cmd->r2t_lock);
3048
3049         ret = iscsit_send_tx_data(cmd, conn, 1);
3050         if (ret < 0) {
3051                 iscsit_tx_thread_wait_for_tcp(conn);
3052                 return ret;
3053         }
3054
3055         spin_lock_bh(&cmd->dataout_timeout_lock);
3056         iscsit_start_dataout_timer(cmd, conn);
3057         spin_unlock_bh(&cmd->dataout_timeout_lock);
3058
3059         return 0;
3060 }
3061
3062 /*
3063  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3064  *              connection recovery.
3065  */
3066 int iscsit_build_r2ts_for_cmd(
3067         struct iscsi_conn *conn,
3068         struct iscsi_cmd *cmd,
3069         bool recovery)
3070 {
3071         int first_r2t = 1;
3072         u32 offset = 0, xfer_len = 0;
3073
3074         spin_lock_bh(&cmd->r2t_lock);
3075         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3076                 spin_unlock_bh(&cmd->r2t_lock);
3077                 return 0;
3078         }
3079
3080         if (conn->sess->sess_ops->DataSequenceInOrder &&
3081             !recovery)
3082                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3083
3084         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3085                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3086                         offset = cmd->r2t_offset;
3087
3088                         if (first_r2t && recovery) {
3089                                 int new_data_end = offset +
3090                                         conn->sess->sess_ops->MaxBurstLength -
3091                                         cmd->next_burst_len;
3092
3093                                 if (new_data_end > cmd->se_cmd.data_length)
3094                                         xfer_len = cmd->se_cmd.data_length - offset;
3095                                 else
3096                                         xfer_len =
3097                                                 conn->sess->sess_ops->MaxBurstLength -
3098                                                 cmd->next_burst_len;
3099                         } else {
3100                                 int new_data_end = offset +
3101                                         conn->sess->sess_ops->MaxBurstLength;
3102
3103                                 if (new_data_end > cmd->se_cmd.data_length)
3104                                         xfer_len = cmd->se_cmd.data_length - offset;
3105                                 else
3106                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3107                         }
3108                         cmd->r2t_offset += xfer_len;
3109
3110                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3111                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3112                 } else {
3113                         struct iscsi_seq *seq;
3114
3115                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3116                         if (!seq) {
3117                                 spin_unlock_bh(&cmd->r2t_lock);
3118                                 return -1;
3119                         }
3120
3121                         offset = seq->offset;
3122                         xfer_len = seq->xfer_len;
3123
3124                         if (cmd->seq_send_order == cmd->seq_count)
3125                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3126                 }
3127                 cmd->outstanding_r2ts++;
3128                 first_r2t = 0;
3129
3130                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3131                         spin_unlock_bh(&cmd->r2t_lock);
3132                         return -1;
3133                 }
3134
3135                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3136                         break;
3137         }
3138         spin_unlock_bh(&cmd->r2t_lock);
3139
3140         return 0;
3141 }
3142
3143 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3144                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3145 {
3146         if (inc_stat_sn)
3147                 cmd->stat_sn = conn->stat_sn++;
3148
3149         atomic_long_inc(&conn->sess->rsp_pdus);
3150
3151         memset(hdr, 0, ISCSI_HDR_LEN);
3152         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3153         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3154         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3155                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3156                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3157         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3158                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3159                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3160         }
3161         hdr->response           = cmd->iscsi_response;
3162         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3163         hdr->itt                = cmd->init_task_tag;
3164         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3165
3166         iscsit_increment_maxcmdsn(cmd, conn->sess);
3167         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3168         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3169
3170         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3171                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3172                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3173                 cmd->se_cmd.scsi_status, conn->cid);
3174 }
3175 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3176
3177 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3178 {
3179         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3180         struct kvec *iov;
3181         u32 padding = 0, tx_size = 0;
3182         int iov_count = 0;
3183         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3184
3185         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3186
3187         iov = &cmd->iov_misc[0];
3188         iov[iov_count].iov_base = cmd->pdu;
3189         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3190         tx_size += ISCSI_HDR_LEN;
3191
3192         /*
3193          * Attach SENSE DATA payload to iSCSI Response PDU
3194          */
3195         if (cmd->se_cmd.sense_buffer &&
3196            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3197             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3198                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3199                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3200
3201                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3202                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3203                 iov[iov_count].iov_base = cmd->sense_buffer;
3204                 iov[iov_count++].iov_len =
3205                                 (cmd->se_cmd.scsi_sense_length + padding);
3206                 tx_size += cmd->se_cmd.scsi_sense_length;
3207
3208                 if (padding) {
3209                         memset(cmd->sense_buffer +
3210                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3211                         tx_size += padding;
3212                         pr_debug("Adding %u bytes of padding to"
3213                                 " SENSE.\n", padding);
3214                 }
3215
3216                 if (conn->conn_ops->DataDigest) {
3217                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3218                                 cmd->sense_buffer,
3219                                 (cmd->se_cmd.scsi_sense_length + padding),
3220                                 0, NULL, (u8 *)&cmd->data_crc);
3221
3222                         iov[iov_count].iov_base    = &cmd->data_crc;
3223                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3224                         tx_size += ISCSI_CRC_LEN;
3225
3226                         pr_debug("Attaching CRC32 DataDigest for"
3227                                 " SENSE, %u bytes CRC 0x%08x\n",
3228                                 (cmd->se_cmd.scsi_sense_length + padding),
3229                                 cmd->data_crc);
3230                 }
3231
3232                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3233                                 " Response PDU\n",
3234                                 cmd->se_cmd.scsi_sense_length);
3235         }
3236
3237         if (conn->conn_ops->HeaderDigest) {
3238                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3239
3240                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3241                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3242
3243                 iov[0].iov_len += ISCSI_CRC_LEN;
3244                 tx_size += ISCSI_CRC_LEN;
3245                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3246                                 " PDU 0x%08x\n", *header_digest);
3247         }
3248
3249         cmd->iov_misc_count = iov_count;
3250         cmd->tx_size = tx_size;
3251
3252         return 0;
3253 }
3254
3255 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3256 {
3257         switch (se_tmr->response) {
3258         case TMR_FUNCTION_COMPLETE:
3259                 return ISCSI_TMF_RSP_COMPLETE;
3260         case TMR_TASK_DOES_NOT_EXIST:
3261                 return ISCSI_TMF_RSP_NO_TASK;
3262         case TMR_LUN_DOES_NOT_EXIST:
3263                 return ISCSI_TMF_RSP_NO_LUN;
3264         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3265                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3266         case TMR_FUNCTION_REJECTED:
3267         default:
3268                 return ISCSI_TMF_RSP_REJECTED;
3269         }
3270 }
3271
3272 void
3273 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3274                           struct iscsi_tm_rsp *hdr)
3275 {
3276         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3277
3278         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3279         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3280         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3281         hdr->itt                = cmd->init_task_tag;
3282         cmd->stat_sn            = conn->stat_sn++;
3283         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3284
3285         iscsit_increment_maxcmdsn(cmd, conn->sess);
3286         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3287         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3288
3289         pr_debug("Built Task Management Response ITT: 0x%08x,"
3290                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3291                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3292 }
3293 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3294
3295 static int
3296 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3297 {
3298         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3299         u32 tx_size = 0;
3300
3301         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3302
3303         cmd->iov_misc[0].iov_base       = cmd->pdu;
3304         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3305         tx_size += ISCSI_HDR_LEN;
3306
3307         if (conn->conn_ops->HeaderDigest) {
3308                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3309
3310                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3311                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3312
3313                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3314                 tx_size += ISCSI_CRC_LEN;
3315                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3316                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3317         }
3318
3319         cmd->iov_misc_count = 1;
3320         cmd->tx_size = tx_size;
3321
3322         return 0;
3323 }
3324
3325 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3326 {
3327         bool ret = false;
3328
3329         if (np->np_sockaddr.ss_family == AF_INET6) {
3330                 const struct sockaddr_in6 sin6 = {
3331                         .sin6_addr = IN6ADDR_ANY_INIT };
3332                 struct sockaddr_in6 *sock_in6 =
3333                          (struct sockaddr_in6 *)&np->np_sockaddr;
3334
3335                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3336                                 sin6.sin6_addr.s6_addr, 16))
3337                         ret = true;
3338         } else {
3339                 struct sockaddr_in * sock_in =
3340                         (struct sockaddr_in *)&np->np_sockaddr;
3341
3342                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3343                         ret = true;
3344         }
3345
3346         return ret;
3347 }
3348
3349 #define SENDTARGETS_BUF_LIMIT 32768U
3350
3351 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3352 {
3353         char *payload = NULL;
3354         struct iscsi_conn *conn = cmd->conn;
3355         struct iscsi_portal_group *tpg;
3356         struct iscsi_tiqn *tiqn;
3357         struct iscsi_tpg_np *tpg_np;
3358         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3359         int target_name_printed;
3360         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3361         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3362
3363         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3364                          SENDTARGETS_BUF_LIMIT);
3365
3366         payload = kzalloc(buffer_len, GFP_KERNEL);
3367         if (!payload) {
3368                 pr_err("Unable to allocate memory for sendtargets"
3369                                 " response.\n");
3370                 return -ENOMEM;
3371         }
3372         /*
3373          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3374          * explicit case..
3375          */
3376         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3377                 text_ptr = strchr(text_in, '=');
3378                 if (!text_ptr) {
3379                         pr_err("Unable to locate '=' string in text_in:"
3380                                " %s\n", text_in);
3381                         kfree(payload);
3382                         return -EINVAL;
3383                 }
3384                 /*
3385                  * Skip over '=' character..
3386                  */
3387                 text_ptr += 1;
3388         }
3389
3390         spin_lock(&tiqn_lock);
3391         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3392                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3393                      strcmp(tiqn->tiqn, text_ptr)) {
3394                         continue;
3395                 }
3396
3397                 target_name_printed = 0;
3398
3399                 spin_lock(&tiqn->tiqn_tpg_lock);
3400                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3401
3402                         /* If demo_mode_discovery=0 and generate_node_acls=0
3403                          * (demo mode dislabed) do not return
3404                          * TargetName+TargetAddress unless a NodeACL exists.
3405                          */
3406
3407                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3408                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3409                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3410                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3411                                 continue;
3412                         }
3413
3414                         spin_lock(&tpg->tpg_state_lock);
3415                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3416                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3417                                 spin_unlock(&tpg->tpg_state_lock);
3418                                 continue;
3419                         }
3420                         spin_unlock(&tpg->tpg_state_lock);
3421
3422                         spin_lock(&tpg->tpg_np_lock);
3423                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3424                                                 tpg_np_list) {
3425                                 struct iscsi_np *np = tpg_np->tpg_np;
3426                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3427
3428                                 if (!target_name_printed) {
3429                                         len = sprintf(buf, "TargetName=%s",
3430                                                       tiqn->tiqn);
3431                                         len += 1;
3432
3433                                         if ((len + payload_len) > buffer_len) {
3434                                                 spin_unlock(&tpg->tpg_np_lock);
3435                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3436                                                 end_of_buf = 1;
3437                                                 goto eob;
3438                                         }
3439                                         memcpy(payload + payload_len, buf, len);
3440                                         payload_len += len;
3441                                         target_name_printed = 1;
3442                                 }
3443
3444                                 len = sprintf(buf, "TargetAddress="
3445                                         "%s:%hu,%hu",
3446                                         (inaddr_any == false) ?
3447                                                 np->np_ip : conn->local_ip,
3448                                         (inaddr_any == false) ?
3449                                                 np->np_port : conn->local_port,
3450                                         tpg->tpgt);
3451                                 len += 1;
3452
3453                                 if ((len + payload_len) > buffer_len) {
3454                                         spin_unlock(&tpg->tpg_np_lock);
3455                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3456                                         end_of_buf = 1;
3457                                         goto eob;
3458                                 }
3459                                 memcpy(payload + payload_len, buf, len);
3460                                 payload_len += len;
3461                         }
3462                         spin_unlock(&tpg->tpg_np_lock);
3463                 }
3464                 spin_unlock(&tiqn->tiqn_tpg_lock);
3465 eob:
3466                 if (end_of_buf)
3467                         break;
3468
3469                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3470                         break;
3471         }
3472         spin_unlock(&tiqn_lock);
3473
3474         cmd->buf_ptr = payload;
3475
3476         return payload_len;
3477 }
3478
3479 int
3480 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3481                       struct iscsi_text_rsp *hdr)
3482 {
3483         int text_length, padding;
3484
3485         text_length = iscsit_build_sendtargets_response(cmd);
3486         if (text_length < 0)
3487                 return text_length;
3488
3489         hdr->opcode = ISCSI_OP_TEXT_RSP;
3490         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3491         padding = ((-text_length) & 3);
3492         hton24(hdr->dlength, text_length);
3493         hdr->itt = cmd->init_task_tag;
3494         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3495         cmd->stat_sn = conn->stat_sn++;
3496         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3497
3498         iscsit_increment_maxcmdsn(cmd, conn->sess);
3499         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3500         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3501
3502         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3503                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3504                 text_length, conn->cid);
3505
3506         return text_length + padding;
3507 }
3508 EXPORT_SYMBOL(iscsit_build_text_rsp);
3509
3510 /*
3511  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3512  *      MaxRecvDataSegmentLength.
3513  */
3514 static int iscsit_send_text_rsp(
3515         struct iscsi_cmd *cmd,
3516         struct iscsi_conn *conn)
3517 {
3518         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3519         struct kvec *iov;
3520         u32 tx_size = 0;
3521         int text_length, iov_count = 0, rc;
3522
3523         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3524         if (rc < 0)
3525                 return rc;
3526
3527         text_length = rc;
3528         iov = &cmd->iov_misc[0];
3529         iov[iov_count].iov_base = cmd->pdu;
3530         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3531         iov[iov_count].iov_base = cmd->buf_ptr;
3532         iov[iov_count++].iov_len = text_length;
3533
3534         tx_size += (ISCSI_HDR_LEN + text_length);
3535
3536         if (conn->conn_ops->HeaderDigest) {
3537                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3538
3539                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3540                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3541
3542                 iov[0].iov_len += ISCSI_CRC_LEN;
3543                 tx_size += ISCSI_CRC_LEN;
3544                 pr_debug("Attaching CRC32 HeaderDigest for"
3545                         " Text Response PDU 0x%08x\n", *header_digest);
3546         }
3547
3548         if (conn->conn_ops->DataDigest) {
3549                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3550                                 cmd->buf_ptr, text_length,
3551                                 0, NULL, (u8 *)&cmd->data_crc);
3552
3553                 iov[iov_count].iov_base = &cmd->data_crc;
3554                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3555                 tx_size += ISCSI_CRC_LEN;
3556
3557                 pr_debug("Attaching DataDigest for %u bytes of text"
3558                         " data, CRC 0x%08x\n", text_length,
3559                         cmd->data_crc);
3560         }
3561
3562         cmd->iov_misc_count = iov_count;
3563         cmd->tx_size = tx_size;
3564
3565         return 0;
3566 }
3567
3568 void
3569 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3570                     struct iscsi_reject *hdr)
3571 {
3572         hdr->opcode             = ISCSI_OP_REJECT;
3573         hdr->reason             = cmd->reject_reason;
3574         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3575         hton24(hdr->dlength, ISCSI_HDR_LEN);
3576         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3577         cmd->stat_sn            = conn->stat_sn++;
3578         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3579         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3580         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3581
3582 }
3583 EXPORT_SYMBOL(iscsit_build_reject);
3584
3585 static int iscsit_send_reject(
3586         struct iscsi_cmd *cmd,
3587         struct iscsi_conn *conn)
3588 {
3589         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3590         struct kvec *iov;
3591         u32 iov_count = 0, tx_size;
3592
3593         iscsit_build_reject(cmd, conn, hdr);
3594
3595         iov = &cmd->iov_misc[0];
3596         iov[iov_count].iov_base = cmd->pdu;
3597         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3598         iov[iov_count].iov_base = cmd->buf_ptr;
3599         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3600
3601         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3602
3603         if (conn->conn_ops->HeaderDigest) {
3604                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3605
3606                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3607                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3608
3609                 iov[0].iov_len += ISCSI_CRC_LEN;
3610                 tx_size += ISCSI_CRC_LEN;
3611                 pr_debug("Attaching CRC32 HeaderDigest for"
3612                         " REJECT PDU 0x%08x\n", *header_digest);
3613         }
3614
3615         if (conn->conn_ops->DataDigest) {
3616                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3617                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3618
3619                 iov[iov_count].iov_base = &cmd->data_crc;
3620                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3621                 tx_size += ISCSI_CRC_LEN;
3622                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3623                                 " PDU 0x%08x\n", cmd->data_crc);
3624         }
3625
3626         cmd->iov_misc_count = iov_count;
3627         cmd->tx_size = tx_size;
3628
3629         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3630                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3631
3632         return 0;
3633 }
3634
3635 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3636 {
3637         struct iscsi_thread_set *ts = conn->thread_set;
3638         int ord, cpu;
3639         /*
3640          * thread_id is assigned from iscsit_global->ts_bitmap from
3641          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3642          *
3643          * Here we use thread_id to determine which CPU that this
3644          * iSCSI connection's iscsi_thread_set will be scheduled to
3645          * execute upon.
3646          */
3647         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3648         for_each_online_cpu(cpu) {
3649                 if (ord-- == 0) {
3650                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3651                         return;
3652                 }
3653         }
3654         /*
3655          * This should never be reached..
3656          */
3657         dump_stack();
3658         cpumask_setall(conn->conn_cpumask);
3659 }
3660
3661 static inline void iscsit_thread_check_cpumask(
3662         struct iscsi_conn *conn,
3663         struct task_struct *p,
3664         int mode)
3665 {
3666         char buf[128];
3667         /*
3668          * mode == 1 signals iscsi_target_tx_thread() usage.
3669          * mode == 0 signals iscsi_target_rx_thread() usage.
3670          */
3671         if (mode == 1) {
3672                 if (!conn->conn_tx_reset_cpumask)
3673                         return;
3674                 conn->conn_tx_reset_cpumask = 0;
3675         } else {
3676                 if (!conn->conn_rx_reset_cpumask)
3677                         return;
3678                 conn->conn_rx_reset_cpumask = 0;
3679         }
3680         /*
3681          * Update the CPU mask for this single kthread so that
3682          * both TX and RX kthreads are scheduled to run on the
3683          * same CPU.
3684          */
3685         memset(buf, 0, 128);
3686         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3687         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3688 }
3689
3690 static int
3691 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3692 {
3693         int ret;
3694
3695         switch (state) {
3696         case ISTATE_SEND_R2T:
3697                 ret = iscsit_send_r2t(cmd, conn);
3698                 if (ret < 0)
3699                         goto err;
3700                 break;
3701         case ISTATE_REMOVE:
3702                 spin_lock_bh(&conn->cmd_lock);
3703                 list_del(&cmd->i_conn_node);
3704                 spin_unlock_bh(&conn->cmd_lock);
3705
3706                 iscsit_free_cmd(cmd, false);
3707                 break;
3708         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3709                 iscsit_mod_nopin_response_timer(conn);
3710                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3711                 if (ret < 0)
3712                         goto err;
3713                 break;
3714         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3715                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3716                 if (ret < 0)
3717                         goto err;
3718                 break;
3719         default:
3720                 pr_err("Unknown Opcode: 0x%02x ITT:"
3721                        " 0x%08x, i_state: %d on CID: %hu\n",
3722                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3723                        conn->cid);
3724                 goto err;
3725         }
3726
3727         return 0;
3728
3729 err:
3730         return -1;
3731 }
3732
3733 static int
3734 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3735 {
3736         struct iscsit_transport *t = conn->conn_transport;
3737         struct iscsi_queue_req *qr;
3738         struct iscsi_cmd *cmd;
3739         u8 state;
3740         int ret;
3741
3742         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3743                 atomic_set(&conn->check_immediate_queue, 0);
3744                 cmd = qr->cmd;
3745                 state = qr->state;
3746                 kmem_cache_free(lio_qr_cache, qr);
3747
3748                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3749                 if (ret < 0)
3750                         return ret;
3751         }
3752
3753         return 0;
3754 }
3755
3756 static int
3757 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3758 {
3759         int ret;
3760
3761 check_rsp_state:
3762         switch (state) {
3763         case ISTATE_SEND_DATAIN:
3764                 ret = iscsit_send_datain(cmd, conn);
3765                 if (ret < 0)
3766                         goto err;
3767                 else if (!ret)
3768                         /* more drs */
3769                         goto check_rsp_state;
3770                 else if (ret == 1) {
3771                         /* all done */
3772                         spin_lock_bh(&cmd->istate_lock);
3773                         cmd->i_state = ISTATE_SENT_STATUS;
3774                         spin_unlock_bh(&cmd->istate_lock);
3775
3776                         if (atomic_read(&conn->check_immediate_queue))
3777                                 return 1;
3778
3779                         return 0;
3780                 } else if (ret == 2) {
3781                         /* Still must send status,
3782                            SCF_TRANSPORT_TASK_SENSE was set */
3783                         spin_lock_bh(&cmd->istate_lock);
3784                         cmd->i_state = ISTATE_SEND_STATUS;
3785                         spin_unlock_bh(&cmd->istate_lock);
3786                         state = ISTATE_SEND_STATUS;
3787                         goto check_rsp_state;
3788                 }
3789
3790                 break;
3791         case ISTATE_SEND_STATUS:
3792         case ISTATE_SEND_STATUS_RECOVERY:
3793                 ret = iscsit_send_response(cmd, conn);
3794                 break;
3795         case ISTATE_SEND_LOGOUTRSP:
3796                 ret = iscsit_send_logout(cmd, conn);
3797                 break;
3798         case ISTATE_SEND_ASYNCMSG:
3799                 ret = iscsit_send_conn_drop_async_message(
3800                         cmd, conn);
3801                 break;
3802         case ISTATE_SEND_NOPIN:
3803                 ret = iscsit_send_nopin(cmd, conn);
3804                 break;
3805         case ISTATE_SEND_REJECT:
3806                 ret = iscsit_send_reject(cmd, conn);
3807                 break;
3808         case ISTATE_SEND_TASKMGTRSP:
3809                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3810                 if (ret != 0)
3811                         break;
3812                 ret = iscsit_tmr_post_handler(cmd, conn);
3813                 if (ret != 0)
3814                         iscsit_fall_back_to_erl0(conn->sess);
3815                 break;
3816         case ISTATE_SEND_TEXTRSP:
3817                 ret = iscsit_send_text_rsp(cmd, conn);
3818                 break;
3819         default:
3820                 pr_err("Unknown Opcode: 0x%02x ITT:"
3821                        " 0x%08x, i_state: %d on CID: %hu\n",
3822                        cmd->iscsi_opcode, cmd->init_task_tag,
3823                        state, conn->cid);
3824                 goto err;
3825         }
3826         if (ret < 0)
3827                 goto err;
3828
3829         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3830                 iscsit_tx_thread_wait_for_tcp(conn);
3831                 iscsit_unmap_iovec(cmd);
3832                 goto err;
3833         }
3834         iscsit_unmap_iovec(cmd);
3835
3836         switch (state) {
3837         case ISTATE_SEND_LOGOUTRSP:
3838                 if (!iscsit_logout_post_handler(cmd, conn))
3839                         goto restart;
3840                 /* fall through */
3841         case ISTATE_SEND_STATUS:
3842         case ISTATE_SEND_ASYNCMSG:
3843         case ISTATE_SEND_NOPIN:
3844         case ISTATE_SEND_STATUS_RECOVERY:
3845         case ISTATE_SEND_TEXTRSP:
3846         case ISTATE_SEND_TASKMGTRSP:
3847         case ISTATE_SEND_REJECT:
3848                 spin_lock_bh(&cmd->istate_lock);
3849                 cmd->i_state = ISTATE_SENT_STATUS;
3850                 spin_unlock_bh(&cmd->istate_lock);
3851                 break;
3852         default:
3853                 pr_err("Unknown Opcode: 0x%02x ITT:"
3854                        " 0x%08x, i_state: %d on CID: %hu\n",
3855                        cmd->iscsi_opcode, cmd->init_task_tag,
3856                        cmd->i_state, conn->cid);
3857                 goto err;
3858         }
3859
3860         if (atomic_read(&conn->check_immediate_queue))
3861                 return 1;
3862
3863         return 0;
3864
3865 err:
3866         return -1;
3867 restart:
3868         return -EAGAIN;
3869 }
3870
3871 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3872 {
3873         struct iscsit_transport *t = conn->conn_transport;
3874         struct iscsi_queue_req *qr;
3875         struct iscsi_cmd *cmd;
3876         u8 state;
3877         int ret;
3878
3879         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3880                 cmd = qr->cmd;
3881                 state = qr->state;
3882                 kmem_cache_free(lio_qr_cache, qr);
3883
3884                 ret = t->iscsit_response_queue(conn, cmd, state);
3885                 if (ret == 1 || ret < 0)
3886                         return ret;
3887         }
3888
3889         return 0;
3890 }
3891
3892 int iscsi_target_tx_thread(void *arg)
3893 {
3894         int ret = 0;
3895         struct iscsi_conn *conn;
3896         struct iscsi_thread_set *ts = arg;
3897         /*
3898          * Allow ourselves to be interrupted by SIGINT so that a
3899          * connection recovery / failure event can be triggered externally.
3900          */
3901         allow_signal(SIGINT);
3902
3903 restart:
3904         conn = iscsi_tx_thread_pre_handler(ts);
3905         if (!conn)
3906                 goto out;
3907
3908         ret = 0;
3909
3910         while (!kthread_should_stop()) {
3911                 /*
3912                  * Ensure that both TX and RX per connection kthreads
3913                  * are scheduled to run on the same CPU.
3914                  */
3915                 iscsit_thread_check_cpumask(conn, current, 1);
3916
3917                 wait_event_interruptible(conn->queues_wq,
3918                                          !iscsit_conn_all_queues_empty(conn) ||
3919                                          ts->status == ISCSI_THREAD_SET_RESET);
3920
3921                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3922                      signal_pending(current))
3923                         goto transport_err;
3924
3925 get_immediate:
3926                 ret = iscsit_handle_immediate_queue(conn);
3927                 if (ret < 0)
3928                         goto transport_err;
3929
3930                 ret = iscsit_handle_response_queue(conn);
3931                 if (ret == 1)
3932                         goto get_immediate;
3933                 else if (ret == -EAGAIN)
3934                         goto restart;
3935                 else if (ret < 0)
3936                         goto transport_err;
3937         }
3938
3939 transport_err:
3940         iscsit_take_action_for_connection_exit(conn);
3941         goto restart;
3942 out:
3943         return 0;
3944 }
3945
3946 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3947 {
3948         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3949         struct iscsi_cmd *cmd;
3950         int ret = 0;
3951
3952         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3953         case ISCSI_OP_SCSI_CMD:
3954                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3955                 if (!cmd)
3956                         goto reject;
3957
3958                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3959                 break;
3960         case ISCSI_OP_SCSI_DATA_OUT:
3961                 ret = iscsit_handle_data_out(conn, buf);
3962                 break;
3963         case ISCSI_OP_NOOP_OUT:
3964                 cmd = NULL;
3965                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3966                         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3967                         if (!cmd)
3968                                 goto reject;
3969                 }
3970                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3971                 break;
3972         case ISCSI_OP_SCSI_TMFUNC:
3973                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3974                 if (!cmd)
3975                         goto reject;
3976
3977                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3978                 break;
3979         case ISCSI_OP_TEXT:
3980                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3981                 if (!cmd)
3982                         goto reject;
3983
3984                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3985                 break;
3986         case ISCSI_OP_LOGOUT:
3987                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3988                 if (!cmd)
3989                         goto reject;
3990
3991                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3992                 if (ret > 0)
3993                         wait_for_completion_timeout(&conn->conn_logout_comp,
3994                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3995                 break;
3996         case ISCSI_OP_SNACK:
3997                 ret = iscsit_handle_snack(conn, buf);
3998                 break;
3999         default:
4000                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4001                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4002                         pr_err("Cannot recover from unknown"
4003                         " opcode while ERL=0, closing iSCSI connection.\n");
4004                         return -1;
4005                 }
4006                 if (!conn->conn_ops->OFMarker) {
4007                         pr_err("Unable to recover from unknown"
4008                         " opcode while OFMarker=No, closing iSCSI"
4009                                 " connection.\n");
4010                         return -1;
4011                 }
4012                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4013                         pr_err("Unable to recover from unknown"
4014                                 " opcode, closing iSCSI connection.\n");
4015                         return -1;
4016                 }
4017                 break;
4018         }
4019
4020         return ret;
4021 reject:
4022         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4023 }
4024
4025 int iscsi_target_rx_thread(void *arg)
4026 {
4027         int ret;
4028         u8 buffer[ISCSI_HDR_LEN], opcode;
4029         u32 checksum = 0, digest = 0;
4030         struct iscsi_conn *conn = NULL;
4031         struct iscsi_thread_set *ts = arg;
4032         struct kvec iov;
4033         /*
4034          * Allow ourselves to be interrupted by SIGINT so that a
4035          * connection recovery / failure event can be triggered externally.
4036          */
4037         allow_signal(SIGINT);
4038
4039 restart:
4040         conn = iscsi_rx_thread_pre_handler(ts);
4041         if (!conn)
4042                 goto out;
4043
4044         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4045                 struct completion comp;
4046                 int rc;
4047
4048                 init_completion(&comp);
4049                 rc = wait_for_completion_interruptible(&comp);
4050                 if (rc < 0)
4051                         goto transport_err;
4052
4053                 goto out;
4054         }
4055
4056         while (!kthread_should_stop()) {
4057                 /*
4058                  * Ensure that both TX and RX per connection kthreads
4059                  * are scheduled to run on the same CPU.
4060                  */
4061                 iscsit_thread_check_cpumask(conn, current, 0);
4062
4063                 memset(buffer, 0, ISCSI_HDR_LEN);
4064                 memset(&iov, 0, sizeof(struct kvec));
4065
4066                 iov.iov_base    = buffer;
4067                 iov.iov_len     = ISCSI_HDR_LEN;
4068
4069                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4070                 if (ret != ISCSI_HDR_LEN) {
4071                         iscsit_rx_thread_wait_for_tcp(conn);
4072                         goto transport_err;
4073                 }
4074
4075                 if (conn->conn_ops->HeaderDigest) {
4076                         iov.iov_base    = &digest;
4077                         iov.iov_len     = ISCSI_CRC_LEN;
4078
4079                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4080                         if (ret != ISCSI_CRC_LEN) {
4081                                 iscsit_rx_thread_wait_for_tcp(conn);
4082                                 goto transport_err;
4083                         }
4084
4085                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4086                                         buffer, ISCSI_HDR_LEN,
4087                                         0, NULL, (u8 *)&checksum);
4088
4089                         if (digest != checksum) {
4090                                 pr_err("HeaderDigest CRC32C failed,"
4091                                         " received 0x%08x, computed 0x%08x\n",
4092                                         digest, checksum);
4093                                 /*
4094                                  * Set the PDU to 0xff so it will intentionally
4095                                  * hit default in the switch below.
4096                                  */
4097                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4098                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4099                         } else {
4100                                 pr_debug("Got HeaderDigest CRC32C"
4101                                                 " 0x%08x\n", checksum);
4102                         }
4103                 }
4104
4105                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4106                         goto transport_err;
4107
4108                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4109
4110                 if (conn->sess->sess_ops->SessionType &&
4111                    ((!(opcode & ISCSI_OP_TEXT)) ||
4112                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4113                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4114                         " while in Discovery Session, rejecting.\n", opcode);
4115                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4116                                           buffer);
4117                         goto transport_err;
4118                 }
4119
4120                 ret = iscsi_target_rx_opcode(conn, buffer);
4121                 if (ret < 0)
4122                         goto transport_err;
4123         }
4124
4125 transport_err:
4126         if (!signal_pending(current))
4127                 atomic_set(&conn->transport_failed, 1);
4128         iscsit_take_action_for_connection_exit(conn);
4129         goto restart;
4130 out:
4131         return 0;
4132 }
4133
4134 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4135 {
4136         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4137         struct iscsi_session *sess = conn->sess;
4138         /*
4139          * We expect this function to only ever be called from either RX or TX
4140          * thread context via iscsit_close_connection() once the other context
4141          * has been reset -> returned sleeping pre-handler state.
4142          */
4143         spin_lock_bh(&conn->cmd_lock);
4144         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4145
4146                 list_del(&cmd->i_conn_node);
4147                 spin_unlock_bh(&conn->cmd_lock);
4148
4149                 iscsit_increment_maxcmdsn(cmd, sess);
4150
4151                 iscsit_free_cmd(cmd, true);
4152
4153                 spin_lock_bh(&conn->cmd_lock);
4154         }
4155         spin_unlock_bh(&conn->cmd_lock);
4156 }
4157
4158 static void iscsit_stop_timers_for_cmds(
4159         struct iscsi_conn *conn)
4160 {
4161         struct iscsi_cmd *cmd;
4162
4163         spin_lock_bh(&conn->cmd_lock);
4164         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4165                 if (cmd->data_direction == DMA_TO_DEVICE)
4166                         iscsit_stop_dataout_timer(cmd);
4167         }
4168         spin_unlock_bh(&conn->cmd_lock);
4169 }
4170
4171 int iscsit_close_connection(
4172         struct iscsi_conn *conn)
4173 {
4174         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4175         struct iscsi_session    *sess = conn->sess;
4176
4177         pr_debug("Closing iSCSI connection CID %hu on SID:"
4178                 " %u\n", conn->cid, sess->sid);
4179         /*
4180          * Always up conn_logout_comp just in case the RX Thread is sleeping
4181          * and the logout response never got sent because the connection
4182          * failed.
4183          */
4184         complete(&conn->conn_logout_comp);
4185
4186         iscsi_release_thread_set(conn);
4187
4188         iscsit_stop_timers_for_cmds(conn);
4189         iscsit_stop_nopin_response_timer(conn);
4190         iscsit_stop_nopin_timer(conn);
4191         iscsit_free_queue_reqs_for_conn(conn);
4192
4193         /*
4194          * During Connection recovery drop unacknowledged out of order
4195          * commands for this connection, and prepare the other commands
4196          * for realligence.
4197          *
4198          * During normal operation clear the out of order commands (but
4199          * do not free the struct iscsi_ooo_cmdsn's) and release all
4200          * struct iscsi_cmds.
4201          */
4202         if (atomic_read(&conn->connection_recovery)) {
4203                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4204                 iscsit_prepare_cmds_for_realligance(conn);
4205         } else {
4206                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4207                 iscsit_release_commands_from_conn(conn);
4208         }
4209
4210         /*
4211          * Handle decrementing session or connection usage count if
4212          * a logout response was not able to be sent because the
4213          * connection failed.  Fall back to Session Recovery here.
4214          */
4215         if (atomic_read(&conn->conn_logout_remove)) {
4216                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4217                         iscsit_dec_conn_usage_count(conn);
4218                         iscsit_dec_session_usage_count(sess);
4219                 }
4220                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4221                         iscsit_dec_conn_usage_count(conn);
4222
4223                 atomic_set(&conn->conn_logout_remove, 0);
4224                 atomic_set(&sess->session_reinstatement, 0);
4225                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4226         }
4227
4228         spin_lock_bh(&sess->conn_lock);
4229         list_del(&conn->conn_list);
4230
4231         /*
4232          * Attempt to let the Initiator know this connection failed by
4233          * sending an Connection Dropped Async Message on another
4234          * active connection.
4235          */
4236         if (atomic_read(&conn->connection_recovery))
4237                 iscsit_build_conn_drop_async_message(conn);
4238
4239         spin_unlock_bh(&sess->conn_lock);
4240
4241         /*
4242          * If connection reinstatement is being performed on this connection,
4243          * up the connection reinstatement semaphore that is being blocked on
4244          * in iscsit_cause_connection_reinstatement().
4245          */
4246         spin_lock_bh(&conn->state_lock);
4247         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4248                 spin_unlock_bh(&conn->state_lock);
4249                 complete(&conn->conn_wait_comp);
4250                 wait_for_completion(&conn->conn_post_wait_comp);
4251                 spin_lock_bh(&conn->state_lock);
4252         }
4253
4254         /*
4255          * If connection reinstatement is being performed on this connection
4256          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4257          * connection wait rcfr semaphore that is being blocked on
4258          * an iscsit_connection_reinstatement_rcfr().
4259          */
4260         if (atomic_read(&conn->connection_wait_rcfr)) {
4261                 spin_unlock_bh(&conn->state_lock);
4262                 complete(&conn->conn_wait_rcfr_comp);
4263                 wait_for_completion(&conn->conn_post_wait_comp);
4264                 spin_lock_bh(&conn->state_lock);
4265         }
4266         atomic_set(&conn->connection_reinstatement, 1);
4267         spin_unlock_bh(&conn->state_lock);
4268
4269         /*
4270          * If any other processes are accessing this connection pointer we
4271          * must wait until they have completed.
4272          */
4273         iscsit_check_conn_usage_count(conn);
4274
4275         if (conn->conn_rx_hash.tfm)
4276                 crypto_free_hash(conn->conn_rx_hash.tfm);
4277         if (conn->conn_tx_hash.tfm)
4278                 crypto_free_hash(conn->conn_tx_hash.tfm);
4279
4280         if (conn->conn_cpumask)
4281                 free_cpumask_var(conn->conn_cpumask);
4282
4283         kfree(conn->conn_ops);
4284         conn->conn_ops = NULL;
4285
4286         if (conn->sock)
4287                 sock_release(conn->sock);
4288
4289         if (conn->conn_transport->iscsit_free_conn)
4290                 conn->conn_transport->iscsit_free_conn(conn);
4291
4292         iscsit_put_transport(conn->conn_transport);
4293
4294         conn->thread_set = NULL;
4295
4296         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4297         conn->conn_state = TARG_CONN_STATE_FREE;
4298         kfree(conn);
4299
4300         spin_lock_bh(&sess->conn_lock);
4301         atomic_dec(&sess->nconn);
4302         pr_debug("Decremented iSCSI connection count to %hu from node:"
4303                 " %s\n", atomic_read(&sess->nconn),
4304                 sess->sess_ops->InitiatorName);
4305         /*
4306          * Make sure that if one connection fails in an non ERL=2 iSCSI
4307          * Session that they all fail.
4308          */
4309         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4310              !atomic_read(&sess->session_logout))
4311                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4312
4313         /*
4314          * If this was not the last connection in the session, and we are
4315          * performing session reinstatement or falling back to ERL=0, call
4316          * iscsit_stop_session() without sleeping to shutdown the other
4317          * active connections.
4318          */
4319         if (atomic_read(&sess->nconn)) {
4320                 if (!atomic_read(&sess->session_reinstatement) &&
4321                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4322                         spin_unlock_bh(&sess->conn_lock);
4323                         return 0;
4324                 }
4325                 if (!atomic_read(&sess->session_stop_active)) {
4326                         atomic_set(&sess->session_stop_active, 1);
4327                         spin_unlock_bh(&sess->conn_lock);
4328                         iscsit_stop_session(sess, 0, 0);
4329                         return 0;
4330                 }
4331                 spin_unlock_bh(&sess->conn_lock);
4332                 return 0;
4333         }
4334
4335         /*
4336          * If this was the last connection in the session and one of the
4337          * following is occurring:
4338          *
4339          * Session Reinstatement is not being performed, and are falling back
4340          * to ERL=0 call iscsit_close_session().
4341          *
4342          * Session Logout was requested.  iscsit_close_session() will be called
4343          * elsewhere.
4344          *
4345          * Session Continuation is not being performed, start the Time2Retain
4346          * handler and check if sleep_on_sess_wait_sem is active.
4347          */
4348         if (!atomic_read(&sess->session_reinstatement) &&
4349              atomic_read(&sess->session_fall_back_to_erl0)) {
4350                 spin_unlock_bh(&sess->conn_lock);
4351                 target_put_session(sess->se_sess);
4352
4353                 return 0;
4354         } else if (atomic_read(&sess->session_logout)) {
4355                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4356                 sess->session_state = TARG_SESS_STATE_FREE;
4357                 spin_unlock_bh(&sess->conn_lock);
4358
4359                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4360                         complete(&sess->session_wait_comp);
4361
4362                 return 0;
4363         } else {
4364                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4365                 sess->session_state = TARG_SESS_STATE_FAILED;
4366
4367                 if (!atomic_read(&sess->session_continuation)) {
4368                         spin_unlock_bh(&sess->conn_lock);
4369                         iscsit_start_time2retain_handler(sess);
4370                 } else
4371                         spin_unlock_bh(&sess->conn_lock);
4372
4373                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4374                         complete(&sess->session_wait_comp);
4375
4376                 return 0;
4377         }
4378         spin_unlock_bh(&sess->conn_lock);
4379
4380         return 0;
4381 }
4382
4383 int iscsit_close_session(struct iscsi_session *sess)
4384 {
4385         struct iscsi_portal_group *tpg = sess->tpg;
4386         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4387
4388         if (atomic_read(&sess->nconn)) {
4389                 pr_err("%d connection(s) still exist for iSCSI session"
4390                         " to %s\n", atomic_read(&sess->nconn),
4391                         sess->sess_ops->InitiatorName);
4392                 BUG();
4393         }
4394
4395         spin_lock_bh(&se_tpg->session_lock);
4396         atomic_set(&sess->session_logout, 1);
4397         atomic_set(&sess->session_reinstatement, 1);
4398         iscsit_stop_time2retain_timer(sess);
4399         spin_unlock_bh(&se_tpg->session_lock);
4400
4401         /*
4402          * transport_deregister_session_configfs() will clear the
4403          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4404          * can be setting it again with __transport_register_session() in
4405          * iscsi_post_login_handler() again after the iscsit_stop_session()
4406          * completes in iscsi_np context.
4407          */
4408         transport_deregister_session_configfs(sess->se_sess);
4409
4410         /*
4411          * If any other processes are accessing this session pointer we must
4412          * wait until they have completed.  If we are in an interrupt (the
4413          * time2retain handler) and contain and active session usage count we
4414          * restart the timer and exit.
4415          */
4416         if (!in_interrupt()) {
4417                 if (iscsit_check_session_usage_count(sess) == 1)
4418                         iscsit_stop_session(sess, 1, 1);
4419         } else {
4420                 if (iscsit_check_session_usage_count(sess) == 2) {
4421                         atomic_set(&sess->session_logout, 0);
4422                         iscsit_start_time2retain_handler(sess);
4423                         return 0;
4424                 }
4425         }
4426
4427         transport_deregister_session(sess->se_sess);
4428
4429         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4430                 iscsit_free_connection_recovery_entires(sess);
4431
4432         iscsit_free_all_ooo_cmdsns(sess);
4433
4434         spin_lock_bh(&se_tpg->session_lock);
4435         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4436         sess->session_state = TARG_SESS_STATE_FREE;
4437         pr_debug("Released iSCSI session from node: %s\n",
4438                         sess->sess_ops->InitiatorName);
4439         tpg->nsessions--;
4440         if (tpg->tpg_tiqn)
4441                 tpg->tpg_tiqn->tiqn_nsessions--;
4442
4443         pr_debug("Decremented number of active iSCSI Sessions on"
4444                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4445
4446         spin_lock(&sess_idr_lock);
4447         idr_remove(&sess_idr, sess->session_index);
4448         spin_unlock(&sess_idr_lock);
4449
4450         kfree(sess->sess_ops);
4451         sess->sess_ops = NULL;
4452         spin_unlock_bh(&se_tpg->session_lock);
4453
4454         kfree(sess);
4455         return 0;
4456 }
4457
4458 static void iscsit_logout_post_handler_closesession(
4459         struct iscsi_conn *conn)
4460 {
4461         struct iscsi_session *sess = conn->sess;
4462
4463         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4464         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4465
4466         atomic_set(&conn->conn_logout_remove, 0);
4467         complete(&conn->conn_logout_comp);
4468
4469         iscsit_dec_conn_usage_count(conn);
4470         iscsit_stop_session(sess, 1, 1);
4471         iscsit_dec_session_usage_count(sess);
4472         target_put_session(sess->se_sess);
4473 }
4474
4475 static void iscsit_logout_post_handler_samecid(
4476         struct iscsi_conn *conn)
4477 {
4478         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4479         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4480
4481         atomic_set(&conn->conn_logout_remove, 0);
4482         complete(&conn->conn_logout_comp);
4483
4484         iscsit_cause_connection_reinstatement(conn, 1);
4485         iscsit_dec_conn_usage_count(conn);
4486 }
4487
4488 static void iscsit_logout_post_handler_diffcid(
4489         struct iscsi_conn *conn,
4490         u16 cid)
4491 {
4492         struct iscsi_conn *l_conn;
4493         struct iscsi_session *sess = conn->sess;
4494
4495         if (!sess)
4496                 return;
4497
4498         spin_lock_bh(&sess->conn_lock);
4499         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4500                 if (l_conn->cid == cid) {
4501                         iscsit_inc_conn_usage_count(l_conn);
4502                         break;
4503                 }
4504         }
4505         spin_unlock_bh(&sess->conn_lock);
4506
4507         if (!l_conn)
4508                 return;
4509
4510         if (l_conn->sock)
4511                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4512
4513         spin_lock_bh(&l_conn->state_lock);
4514         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4515         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4516         spin_unlock_bh(&l_conn->state_lock);
4517
4518         iscsit_cause_connection_reinstatement(l_conn, 1);
4519         iscsit_dec_conn_usage_count(l_conn);
4520 }
4521
4522 /*
4523  *      Return of 0 causes the TX thread to restart.
4524  */
4525 int iscsit_logout_post_handler(
4526         struct iscsi_cmd *cmd,
4527         struct iscsi_conn *conn)
4528 {
4529         int ret = 0;
4530
4531         switch (cmd->logout_reason) {
4532         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4533                 switch (cmd->logout_response) {
4534                 case ISCSI_LOGOUT_SUCCESS:
4535                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4536                 default:
4537                         iscsit_logout_post_handler_closesession(conn);
4538                         break;
4539                 }
4540                 ret = 0;
4541                 break;
4542         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4543                 if (conn->cid == cmd->logout_cid) {
4544                         switch (cmd->logout_response) {
4545                         case ISCSI_LOGOUT_SUCCESS:
4546                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4547                         default:
4548                                 iscsit_logout_post_handler_samecid(conn);
4549                                 break;
4550                         }
4551                         ret = 0;
4552                 } else {
4553                         switch (cmd->logout_response) {
4554                         case ISCSI_LOGOUT_SUCCESS:
4555                                 iscsit_logout_post_handler_diffcid(conn,
4556                                         cmd->logout_cid);
4557                                 break;
4558                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4559                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4560                         default:
4561                                 break;
4562                         }
4563                         ret = 1;
4564                 }
4565                 break;
4566         case ISCSI_LOGOUT_REASON_RECOVERY:
4567                 switch (cmd->logout_response) {
4568                 case ISCSI_LOGOUT_SUCCESS:
4569                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4570                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4571                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4572                 default:
4573                         break;
4574                 }
4575                 ret = 1;
4576                 break;
4577         default:
4578                 break;
4579
4580         }
4581         return ret;
4582 }
4583 EXPORT_SYMBOL(iscsit_logout_post_handler);
4584
4585 void iscsit_fail_session(struct iscsi_session *sess)
4586 {
4587         struct iscsi_conn *conn;
4588
4589         spin_lock_bh(&sess->conn_lock);
4590         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4591                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4592                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4593         }
4594         spin_unlock_bh(&sess->conn_lock);
4595
4596         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4597         sess->session_state = TARG_SESS_STATE_FAILED;
4598 }
4599
4600 int iscsit_free_session(struct iscsi_session *sess)
4601 {
4602         u16 conn_count = atomic_read(&sess->nconn);
4603         struct iscsi_conn *conn, *conn_tmp = NULL;
4604         int is_last;
4605
4606         spin_lock_bh(&sess->conn_lock);
4607         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4608
4609         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4610                         conn_list) {
4611                 if (conn_count == 0)
4612                         break;
4613
4614                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4615                         is_last = 1;
4616                 } else {
4617                         iscsit_inc_conn_usage_count(conn_tmp);
4618                         is_last = 0;
4619                 }
4620                 iscsit_inc_conn_usage_count(conn);
4621
4622                 spin_unlock_bh(&sess->conn_lock);
4623                 iscsit_cause_connection_reinstatement(conn, 1);
4624                 spin_lock_bh(&sess->conn_lock);
4625
4626                 iscsit_dec_conn_usage_count(conn);
4627                 if (is_last == 0)
4628                         iscsit_dec_conn_usage_count(conn_tmp);
4629
4630                 conn_count--;
4631         }
4632
4633         if (atomic_read(&sess->nconn)) {
4634                 spin_unlock_bh(&sess->conn_lock);
4635                 wait_for_completion(&sess->session_wait_comp);
4636         } else
4637                 spin_unlock_bh(&sess->conn_lock);
4638
4639         target_put_session(sess->se_sess);
4640         return 0;
4641 }
4642
4643 void iscsit_stop_session(
4644         struct iscsi_session *sess,
4645         int session_sleep,
4646         int connection_sleep)
4647 {
4648         u16 conn_count = atomic_read(&sess->nconn);
4649         struct iscsi_conn *conn, *conn_tmp = NULL;
4650         int is_last;
4651
4652         spin_lock_bh(&sess->conn_lock);
4653         if (session_sleep)
4654                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4655
4656         if (connection_sleep) {
4657                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4658                                 conn_list) {
4659                         if (conn_count == 0)
4660                                 break;
4661
4662                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4663                                 is_last = 1;
4664                         } else {
4665                                 iscsit_inc_conn_usage_count(conn_tmp);
4666                                 is_last = 0;
4667                         }
4668                         iscsit_inc_conn_usage_count(conn);
4669
4670                         spin_unlock_bh(&sess->conn_lock);
4671                         iscsit_cause_connection_reinstatement(conn, 1);
4672                         spin_lock_bh(&sess->conn_lock);
4673
4674                         iscsit_dec_conn_usage_count(conn);
4675                         if (is_last == 0)
4676                                 iscsit_dec_conn_usage_count(conn_tmp);
4677                         conn_count--;
4678                 }
4679         } else {
4680                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4681                         iscsit_cause_connection_reinstatement(conn, 0);
4682         }
4683
4684         if (session_sleep && atomic_read(&sess->nconn)) {
4685                 spin_unlock_bh(&sess->conn_lock);
4686                 wait_for_completion(&sess->session_wait_comp);
4687         } else
4688                 spin_unlock_bh(&sess->conn_lock);
4689 }
4690
4691 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4692 {
4693         struct iscsi_session *sess;
4694         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4695         struct se_session *se_sess, *se_sess_tmp;
4696         int session_count = 0;
4697
4698         spin_lock_bh(&se_tpg->session_lock);
4699         if (tpg->nsessions && !force) {
4700                 spin_unlock_bh(&se_tpg->session_lock);
4701                 return -1;
4702         }
4703
4704         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4705                         sess_list) {
4706                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4707
4708                 spin_lock(&sess->conn_lock);
4709                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4710                     atomic_read(&sess->session_logout) ||
4711                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4712                         spin_unlock(&sess->conn_lock);
4713                         continue;
4714                 }
4715                 atomic_set(&sess->session_reinstatement, 1);
4716                 spin_unlock(&sess->conn_lock);
4717                 spin_unlock_bh(&se_tpg->session_lock);
4718
4719                 iscsit_free_session(sess);
4720                 spin_lock_bh(&se_tpg->session_lock);
4721
4722                 session_count++;
4723         }
4724         spin_unlock_bh(&se_tpg->session_lock);
4725
4726         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4727                         " Group: %hu\n", session_count, tpg->tpgt);
4728         return 0;
4729 }
4730
4731 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4732 MODULE_VERSION("4.1.x");
4733 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4734 MODULE_LICENSE("GPL");
4735
4736 module_init(iscsi_target_init_module);
4737 module_exit(iscsi_target_cleanup_module);