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