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_MUTEX(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 /*
 311  * Called with mutex np_lock held
 312  */
 313 static struct iscsi_np *iscsit_get_np(
 314         struct __kernel_sockaddr_storage *sockaddr,
 315         int network_transport)
 316 {
 317         struct iscsi_np *np;
 318         bool match;
 319
 320         list_for_each_entry(np, &g_np_list, np_list) {
 321                 spin_lock_bh(&np->np_thread_lock);
 322                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 323                         spin_unlock_bh(&np->np_thread_lock);
 324                         continue;
 325                 }
 326
 327                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 328                 if (match == true) {
 329                         /*
 330                          * Increment the np_exports reference count now to
 331                          * prevent iscsit_del_np() below from being called
 332                          * while iscsi_tpg_add_network_portal() is called.
 333                          */
 334                         np->np_exports++;
 335                         spin_unlock_bh(&np->np_thread_lock);
 336                         return np;
 337                 }
 338                 spin_unlock_bh(&np->np_thread_lock);
 339         }
 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         mutex_lock(&np_lock);
 355
 356         /*
 357          * Locate the existing struct iscsi_np if already active..
 358          */
 359         np = iscsit_get_np(sockaddr, network_transport);
 360         if (np) {
 361                 mutex_unlock(&np_lock);
 362                 return np;
 363         }
 364
 365         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 366         if (!np) {
 367                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 368                 mutex_unlock(&np_lock);
 369                 return ERR_PTR(-ENOMEM);
 370         }
 371
 372         np->np_flags |= NPF_IP_NETWORK;
 373         if (sockaddr->ss_family == AF_INET6) {
 374                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 375                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 376                 np->np_port = ntohs(sock_in6->sin6_port);
 377         } else {
 378                 sock_in = (struct sockaddr_in *)sockaddr;
 379                 sprintf(np->np_ip, "%s", ip_str);
 380                 np->np_port = ntohs(sock_in->sin_port);
 381         }
 382
 383         np->np_network_transport = network_transport;
 384         spin_lock_init(&np->np_thread_lock);
 385         init_completion(&np->np_restart_comp);
 386         INIT_LIST_HEAD(&np->np_list);
 387
 388         ret = iscsi_target_setup_login_socket(np, sockaddr);
 389         if (ret != 0) {
 390                 kfree(np);
 391                 mutex_unlock(&np_lock);
 392                 return ERR_PTR(ret);
 393         }
 394
 395         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 396         if (IS_ERR(np->np_thread)) {
 397                 pr_err("Unable to create kthread: iscsi_np\n");
 398                 ret = PTR_ERR(np->np_thread);
 399                 kfree(np);
 400                 mutex_unlock(&np_lock);
 401                 return ERR_PTR(ret);
 402         }
 403         /*
 404          * Increment the np_exports reference count now to prevent
 405          * iscsit_del_np() below from being run while a new call to
 406          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 407          * active.  We don't need to hold np->np_thread_lock at this
 408          * point because iscsi_np has not been added to g_np_list yet.
 409          */
 410         np->np_exports = 1;
 411         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 412
 413         list_add_tail(&np->np_list, &g_np_list);
 414         mutex_unlock(&np_lock);
 415
 416         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 417                 np->np_ip, np->np_port, np->np_transport->name);
 418
 419         return np;
 420 }
 421
 422 int iscsit_reset_np_thread(
 423         struct iscsi_np *np,
 424         struct iscsi_tpg_np *tpg_np,
 425         struct iscsi_portal_group *tpg,
 426         bool shutdown)
 427 {
 428         spin_lock_bh(&np->np_thread_lock);
 429         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 430                 spin_unlock_bh(&np->np_thread_lock);
 431                 return 0;
 432         }
 433         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 434
 435         if (np->np_thread) {
 436                 spin_unlock_bh(&np->np_thread_lock);
 437                 send_sig(SIGINT, np->np_thread, 1);
 438                 wait_for_completion(&np->np_restart_comp);
 439                 spin_lock_bh(&np->np_thread_lock);
 440         }
 441         spin_unlock_bh(&np->np_thread_lock);
 442
 443         if (tpg_np && shutdown) {
 444                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 445
 446                 wait_for_completion(&tpg_np->tpg_np_comp);
 447         }
 448
 449         return 0;
 450 }
 451
 452 static void iscsit_free_np(struct iscsi_np *np)
 453 {
 454         if (np->np_socket)
 455                 sock_release(np->np_socket);
 456 }
 457
 458 int iscsit_del_np(struct iscsi_np *np)
 459 {
 460         spin_lock_bh(&np->np_thread_lock);
 461         np->np_exports--;
 462         if (np->np_exports) {
 463                 spin_unlock_bh(&np->np_thread_lock);
 464                 return 0;
 465         }
 466         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 467         spin_unlock_bh(&np->np_thread_lock);
 468
 469         if (np->np_thread) {
 470                 /*
 471                  * We need to send the signal to wakeup Linux/Net
 472                  * which may be sleeping in sock_accept()..
 473                  */
 474                 send_sig(SIGINT, np->np_thread, 1);
 475                 kthread_stop(np->np_thread);
 476                 np->np_thread = NULL;
 477         }
 478
 479         np->np_transport->iscsit_free_np(np);
 480
 481         mutex_lock(&np_lock);
 482         list_del(&np->np_list);
 483         mutex_unlock(&np_lock);
 484
 485         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 486                 np->np_ip, np->np_port, np->np_transport->name);
 487
 488         iscsit_put_transport(np->np_transport);
 489         kfree(np);
 490         return 0;
 491 }
 492
 493 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 494 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 495
 496 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 497 {
 498         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 499         return 0;
 500 }
 501
 502 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 503 {
 504         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 505
 506         spin_lock_bh(&conn->cmd_lock);
 507         if (!list_empty(&cmd->i_conn_node))
 508                 list_del_init(&cmd->i_conn_node);
 509         spin_unlock_bh(&conn->cmd_lock);
 510
 511         __iscsit_free_cmd(cmd, scsi_cmd, true);
 512 }
 513
 514 static struct iscsit_transport iscsi_target_transport = {
 515         .name                   = "iSCSI/TCP",
 516         .transport_type         = ISCSI_TCP,
 517         .owner                  = NULL,
 518         .iscsit_setup_np        = iscsit_setup_np,
 519         .iscsit_accept_np       = iscsit_accept_np,
 520         .iscsit_free_np         = iscsit_free_np,
 521         .iscsit_get_login_rx    = iscsit_get_login_rx,
 522         .iscsit_put_login_tx    = iscsit_put_login_tx,
 523         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 524         .iscsit_immediate_queue = iscsit_immediate_queue,
 525         .iscsit_response_queue  = iscsit_response_queue,
 526         .iscsit_queue_data_in   = iscsit_queue_rsp,
 527         .iscsit_queue_status    = iscsit_queue_rsp,
 528         .iscsit_aborted_task    = iscsit_aborted_task,
 529 };
 530
 531 static int __init iscsi_target_init_module(void)
 532 {
 533         int ret = 0;
 534
 535         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 536
 537         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 538         if (!iscsit_global) {
 539                 pr_err("Unable to allocate memory for iscsit_global\n");
 540                 return -1;
 541         }
 542         mutex_init(&auth_id_lock);
 543         spin_lock_init(&sess_idr_lock);
 544         idr_init(&tiqn_idr);
 545         idr_init(&sess_idr);
 546
 547         ret = iscsi_target_register_configfs();
 548         if (ret < 0)
 549                 goto out;
 550
 551         ret = iscsi_thread_set_init();
 552         if (ret < 0)
 553                 goto configfs_out;
 554
 555         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 556                         TARGET_THREAD_SET_COUNT) {
 557                 pr_err("iscsi_allocate_thread_sets() returned"
 558                         " unexpected value!\n");
 559                 goto ts_out1;
 560         }
 561
 562         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 563                         sizeof(struct iscsi_queue_req),
 564                         __alignof__(struct iscsi_queue_req), 0, NULL);
 565         if (!lio_qr_cache) {
 566                 pr_err("nable to kmem_cache_create() for"
 567                                 " lio_qr_cache\n");
 568                 goto ts_out2;
 569         }
 570
 571         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 572                         sizeof(struct iscsi_datain_req),
 573                         __alignof__(struct iscsi_datain_req), 0, NULL);
 574         if (!lio_dr_cache) {
 575                 pr_err("Unable to kmem_cache_create() for"
 576                                 " lio_dr_cache\n");
 577                 goto qr_out;
 578         }
 579
 580         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 581                         sizeof(struct iscsi_ooo_cmdsn),
 582                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 583         if (!lio_ooo_cache) {
 584                 pr_err("Unable to kmem_cache_create() for"
 585                                 " lio_ooo_cache\n");
 586                 goto dr_out;
 587         }
 588
 589         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 590                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 591                         0, NULL);
 592         if (!lio_r2t_cache) {
 593                 pr_err("Unable to kmem_cache_create() for"
 594                                 " lio_r2t_cache\n");
 595                 goto ooo_out;
 596         }
 597
 598         iscsit_register_transport(&iscsi_target_transport);
 599
 600         if (iscsit_load_discovery_tpg() < 0)
 601                 goto r2t_out;
 602
 603         return ret;
 604 r2t_out:
 605         kmem_cache_destroy(lio_r2t_cache);
 606 ooo_out:
 607         kmem_cache_destroy(lio_ooo_cache);
 608 dr_out:
 609         kmem_cache_destroy(lio_dr_cache);
 610 qr_out:
 611         kmem_cache_destroy(lio_qr_cache);
 612 ts_out2:
 613         iscsi_deallocate_thread_sets();
 614 ts_out1:
 615         iscsi_thread_set_free();
 616 configfs_out:
 617         iscsi_target_deregister_configfs();
 618 out:
 619         kfree(iscsit_global);
 620         return -ENOMEM;
 621 }
 622
 623 static void __exit iscsi_target_cleanup_module(void)
 624 {
 625         iscsi_deallocate_thread_sets();
 626         iscsi_thread_set_free();
 627         iscsit_release_discovery_tpg();
 628         iscsit_unregister_transport(&iscsi_target_transport);
 629         kmem_cache_destroy(lio_qr_cache);
 630         kmem_cache_destroy(lio_dr_cache);
 631         kmem_cache_destroy(lio_ooo_cache);
 632         kmem_cache_destroy(lio_r2t_cache);
 633
 634         iscsi_target_deregister_configfs();
 635
 636         kfree(iscsit_global);
 637 }
 638
 639 static int iscsit_add_reject(
 640         struct iscsi_conn *conn,
 641         u8 reason,
 642         unsigned char *buf)
 643 {
 644         struct iscsi_cmd *cmd;
 645
 646         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 647         if (!cmd)
 648                 return -1;
 649
 650         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 651         cmd->reject_reason = reason;
 652
 653         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 654         if (!cmd->buf_ptr) {
 655                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 656                 iscsit_free_cmd(cmd, false);
 657                 return -1;
 658         }
 659
 660         spin_lock_bh(&conn->cmd_lock);
 661         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 662         spin_unlock_bh(&conn->cmd_lock);
 663
 664         cmd->i_state = ISTATE_SEND_REJECT;
 665         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 666
 667         return -1;
 668 }
 669
 670 static int iscsit_add_reject_from_cmd(
 671         struct iscsi_cmd *cmd,
 672         u8 reason,
 673         bool add_to_conn,
 674         unsigned char *buf)
 675 {
 676         struct iscsi_conn *conn;
 677
 678         if (!cmd->conn) {
 679                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 680                                 cmd->init_task_tag);
 681                 return -1;
 682         }
 683         conn = cmd->conn;
 684
 685         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 686         cmd->reject_reason = reason;
 687
 688         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 689         if (!cmd->buf_ptr) {
 690                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 691                 iscsit_free_cmd(cmd, false);
 692                 return -1;
 693         }
 694
 695         if (add_to_conn) {
 696                 spin_lock_bh(&conn->cmd_lock);
 697                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 698                 spin_unlock_bh(&conn->cmd_lock);
 699         }
 700
 701         cmd->i_state = ISTATE_SEND_REJECT;
 702         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 703         /*
 704          * Perform the kref_put now if se_cmd has already been setup by
 705          * scsit_setup_scsi_cmd()
 706          */
 707         if (cmd->se_cmd.se_tfo != NULL) {
 708                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 709                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 710         }
 711         return -1;
 712 }
 713
 714 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 715                                  unsigned char *buf)
 716 {
 717         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 718 }
 719
 720 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 721 {
 722         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 723 }
 724
 725 /*
 726  * Map some portion of the allocated scatterlist to an iovec, suitable for
 727  * kernel sockets to copy data in/out.
 728  */
 729 static int iscsit_map_iovec(
 730         struct iscsi_cmd *cmd,
 731         struct kvec *iov,
 732         u32 data_offset,
 733         u32 data_length)
 734 {
 735         u32 i = 0;
 736         struct scatterlist *sg;
 737         unsigned int page_off;
 738
 739         /*
 740          * We know each entry in t_data_sg contains a page.
 741          */
 742         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 743         page_off = (data_offset % PAGE_SIZE);
 744
 745         cmd->first_data_sg = sg;
 746         cmd->first_data_sg_off = page_off;
 747
 748         while (data_length) {
 749                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 750
 751                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 752                 iov[i].iov_len = cur_len;
 753
 754                 data_length -= cur_len;
 755                 page_off = 0;
 756                 sg = sg_next(sg);
 757                 i++;
 758         }
 759
 760         cmd->kmapped_nents = i;
 761
 762         return i;
 763 }
 764
 765 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 766 {
 767         u32 i;
 768         struct scatterlist *sg;
 769
 770         sg = cmd->first_data_sg;
 771
 772         for (i = 0; i < cmd->kmapped_nents; i++)
 773                 kunmap(sg_page(&sg[i]));
 774 }
 775
 776 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 777 {
 778         LIST_HEAD(ack_list);
 779         struct iscsi_cmd *cmd, *cmd_p;
 780
 781         conn->exp_statsn = exp_statsn;
 782
 783         if (conn->sess->sess_ops->RDMAExtensions)
 784                 return;
 785
 786         spin_lock_bh(&conn->cmd_lock);
 787         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 788                 spin_lock(&cmd->istate_lock);
 789                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 790                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 791                         cmd->i_state = ISTATE_REMOVE;
 792                         spin_unlock(&cmd->istate_lock);
 793                         list_move_tail(&cmd->i_conn_node, &ack_list);
 794                         continue;
 795                 }
 796                 spin_unlock(&cmd->istate_lock);
 797         }
 798         spin_unlock_bh(&conn->cmd_lock);
 799
 800         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 801                 list_del_init(&cmd->i_conn_node);
 802                 iscsit_free_cmd(cmd, false);
 803         }
 804 }
 805
 806 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 807 {
 808         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 809
 810         iov_count += ISCSI_IOV_DATA_BUFFER;
 811
 812         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 813         if (!cmd->iov_data) {
 814                 pr_err("Unable to allocate cmd->iov_data\n");
 815                 return -ENOMEM;
 816         }
 817
 818         cmd->orig_iov_data_count = iov_count;
 819         return 0;
 820 }
 821
 822 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 823                           unsigned char *buf)
 824 {
 825         int data_direction, payload_length;
 826         struct iscsi_scsi_req *hdr;
 827         int iscsi_task_attr;
 828         int sam_task_attr;
 829
 830         atomic_long_inc(&conn->sess->cmd_pdus);
 831
 832         hdr                     = (struct iscsi_scsi_req *) buf;
 833         payload_length          = ntoh24(hdr->dlength);
 834
 835         /* FIXME; Add checks for AdditionalHeaderSegment */
 836
 837         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 838             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 839                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 840                                 " not set. Bad iSCSI Initiator.\n");
 841                 return iscsit_add_reject_cmd(cmd,
 842                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 843         }
 844
 845         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 846              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 847                 /*
 848                  * From RFC-3720 Section 10.3.1:
 849                  *
 850                  * "Either or both of R and W MAY be 1 when either the
 851                  *  Expected Data Transfer Length and/or Bidirectional Read
 852                  *  Expected Data Transfer Length are 0"
 853                  *
 854                  * For this case, go ahead and clear the unnecssary bits
 855                  * to avoid any confusion with ->data_direction.
 856                  */
 857                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 858                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 859
 860                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 861                         " set when Expected Data Transfer Length is 0 for"
 862                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 863         }
 864
 865         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 866             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 867                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 868                         " MUST be set if Expected Data Transfer Length is not 0."
 869                         " Bad iSCSI Initiator\n");
 870                 return iscsit_add_reject_cmd(cmd,
 871                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 872         }
 873
 874         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 875             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 876                 pr_err("Bidirectional operations not supported!\n");
 877                 return iscsit_add_reject_cmd(cmd,
 878                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 879         }
 880
 881         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 882                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 883                                 " Scsi Command PDU.\n");
 884                 return iscsit_add_reject_cmd(cmd,
 885                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 886         }
 887
 888         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 889                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 890                         " protocol error.\n", payload_length);
 891                 return iscsit_add_reject_cmd(cmd,
 892                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 893         }
 894
 895         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 896             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 897                 pr_err("Expected Data Transfer Length and Length of"
 898                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 899                         " bit is not set protocol error\n");
 900                 return iscsit_add_reject_cmd(cmd,
 901                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 902         }
 903
 904         if (payload_length > be32_to_cpu(hdr->data_length)) {
 905                 pr_err("DataSegmentLength: %u is greater than"
 906                         " EDTL: %u, protocol error.\n", payload_length,
 907                                 hdr->data_length);
 908                 return iscsit_add_reject_cmd(cmd,
 909                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 910         }
 911
 912         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 913                 pr_err("DataSegmentLength: %u is greater than"
 914                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 915                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 916                 return iscsit_add_reject_cmd(cmd,
 917                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 918         }
 919
 920         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 921                 pr_err("DataSegmentLength: %u is greater than"
 922                         " FirstBurstLength: %u, protocol error.\n",
 923                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 924                 return iscsit_add_reject_cmd(cmd,
 925                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 926         }
 927
 928         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 929                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 930                           DMA_NONE;
 931
 932         cmd->data_direction = data_direction;
 933         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 934         /*
 935          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 936          */
 937         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 938             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 939                 sam_task_attr = MSG_SIMPLE_TAG;
 940         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 941                 sam_task_attr = MSG_ORDERED_TAG;
 942         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 943                 sam_task_attr = MSG_HEAD_TAG;
 944         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 945                 sam_task_attr = MSG_ACA_TAG;
 946         else {
 947                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 948                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 949                 sam_task_attr = MSG_SIMPLE_TAG;
 950         }
 951
 952         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 953         cmd->i_state            = ISTATE_NEW_CMD;
 954         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 955         cmd->immediate_data     = (payload_length) ? 1 : 0;
 956         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 957                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 958         if (cmd->unsolicited_data)
 959                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 960
 961         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 962         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 963                 spin_lock_bh(&conn->sess->ttt_lock);
 964                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 965                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 966                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 967                 spin_unlock_bh(&conn->sess->ttt_lock);
 968         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 969                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 970         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 971         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 972         cmd->first_burst_len    = payload_length;
 973
 974         if (!conn->sess->sess_ops->RDMAExtensions &&
 975              cmd->data_direction == DMA_FROM_DEVICE) {
 976                 struct iscsi_datain_req *dr;
 977
 978                 dr = iscsit_allocate_datain_req();
 979                 if (!dr)
 980                         return iscsit_add_reject_cmd(cmd,
 981                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 982
 983                 iscsit_attach_datain_req(cmd, dr);
 984         }
 985
 986         /*
 987          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 988          */
 989         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 990                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 991                         cmd->data_direction, sam_task_attr,
 992                         cmd->sense_buffer + 2);
 993
 994         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 995                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 996                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
 997                 conn->cid);
 998
 999         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1000
1001         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1002                                                      scsilun_to_int(&hdr->lun));
1003         if (cmd->sense_reason)
1004                 goto attach_cmd;
1005
1006         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1007         if (cmd->sense_reason) {
1008                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1009                         return iscsit_add_reject_cmd(cmd,
1010                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1011                 }
1012
1013                 goto attach_cmd;
1014         }
1015
1016         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1017                 return iscsit_add_reject_cmd(cmd,
1018                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1019         }
1020
1021 attach_cmd:
1022         spin_lock_bh(&conn->cmd_lock);
1023         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1024         spin_unlock_bh(&conn->cmd_lock);
1025         /*
1026          * Check if we need to delay processing because of ALUA
1027          * Active/NonOptimized primary access state..
1028          */
1029         core_alua_check_nonop_delay(&cmd->se_cmd);
1030
1031         return 0;
1032 }
1033 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1034
1035 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1036 {
1037         iscsit_set_dataout_sequence_values(cmd);
1038
1039         spin_lock_bh(&cmd->dataout_timeout_lock);
1040         iscsit_start_dataout_timer(cmd, cmd->conn);
1041         spin_unlock_bh(&cmd->dataout_timeout_lock);
1042 }
1043 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1044
1045 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1046                             struct iscsi_scsi_req *hdr)
1047 {
1048         int cmdsn_ret = 0;
1049         /*
1050          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1051          * the Immediate Bit is not set, and no Immediate
1052          * Data is attached.
1053          *
1054          * A PDU/CmdSN carrying Immediate Data can only
1055          * be processed after the DataCRC has passed.
1056          * If the DataCRC fails, the CmdSN MUST NOT
1057          * be acknowledged. (See below)
1058          */
1059         if (!cmd->immediate_data) {
1060                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1061                                         (unsigned char *)hdr, hdr->cmdsn);
1062                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1063                         return -1;
1064                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1065                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1066                         return 0;
1067                 }
1068         }
1069
1070         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1071
1072         /*
1073          * If no Immediate Data is attached, it's OK to return now.
1074          */
1075         if (!cmd->immediate_data) {
1076                 if (!cmd->sense_reason && cmd->unsolicited_data)
1077                         iscsit_set_unsoliticed_dataout(cmd);
1078                 if (!cmd->sense_reason)
1079                         return 0;
1080
1081                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1082                 return 0;
1083         }
1084
1085         /*
1086          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1087          * execution.  These exceptions are processed in CmdSN order using
1088          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1089          */
1090         if (cmd->sense_reason) {
1091                 if (cmd->reject_reason)
1092                         return 0;
1093
1094                 return 1;
1095         }
1096         /*
1097          * Call directly into transport_generic_new_cmd() to perform
1098          * the backend memory allocation.
1099          */
1100         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1101         if (cmd->sense_reason)
1102                 return 1;
1103
1104         return 0;
1105 }
1106 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1107
1108 static int
1109 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1110                           bool dump_payload)
1111 {
1112         struct iscsi_conn *conn = cmd->conn;
1113         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1114         /*
1115          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1116          */
1117         if (dump_payload == true)
1118                 goto after_immediate_data;
1119
1120         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1121                                         cmd->first_burst_len);
1122 after_immediate_data:
1123         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1124                 /*
1125                  * A PDU/CmdSN carrying Immediate Data passed
1126                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1127                  * Immediate Bit is not set.
1128                  */
1129                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1130                                         (unsigned char *)hdr, hdr->cmdsn);
1131                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1132                         return -1;
1133
1134                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1135                         int rc;
1136
1137                         rc = iscsit_dump_data_payload(cmd->conn,
1138                                                       cmd->first_burst_len, 1);
1139                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1140                         return rc;
1141                 } else if (cmd->unsolicited_data)
1142                         iscsit_set_unsoliticed_dataout(cmd);
1143
1144         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1145                 /*
1146                  * Immediate Data failed DataCRC and ERL>=1,
1147                  * silently drop this PDU and let the initiator
1148                  * plug the CmdSN gap.
1149                  *
1150                  * FIXME: Send Unsolicited NOPIN with reserved
1151                  * TTT here to help the initiator figure out
1152                  * the missing CmdSN, although they should be
1153                  * intelligent enough to determine the missing
1154                  * CmdSN and issue a retry to plug the sequence.
1155                  */
1156                 cmd->i_state = ISTATE_REMOVE;
1157                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1158         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1159                 return -1;
1160
1161         return 0;
1162 }
1163
1164 static int
1165 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1166                            unsigned char *buf)
1167 {
1168         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1169         int rc, immed_data;
1170         bool dump_payload = false;
1171
1172         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1173         if (rc < 0)
1174                 return 0;
1175         /*
1176          * Allocation iovecs needed for struct socket operations for
1177          * traditional iSCSI block I/O.
1178          */
1179         if (iscsit_allocate_iovecs(cmd) < 0) {
1180                 return iscsit_add_reject_cmd(cmd,
1181                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182         }
1183         immed_data = cmd->immediate_data;
1184
1185         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1186         if (rc < 0)
1187                 return rc;
1188         else if (rc > 0)
1189                 dump_payload = true;
1190
1191         if (!immed_data)
1192                 return 0;
1193
1194         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1195 }
1196
1197 static u32 iscsit_do_crypto_hash_sg(
1198         struct hash_desc *hash,
1199         struct iscsi_cmd *cmd,
1200         u32 data_offset,
1201         u32 data_length,
1202         u32 padding,
1203         u8 *pad_bytes)
1204 {
1205         u32 data_crc;
1206         u32 i;
1207         struct scatterlist *sg;
1208         unsigned int page_off;
1209
1210         crypto_hash_init(hash);
1211
1212         sg = cmd->first_data_sg;
1213         page_off = cmd->first_data_sg_off;
1214
1215         i = 0;
1216         while (data_length) {
1217                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1218
1219                 crypto_hash_update(hash, &sg[i], cur_len);
1220
1221                 data_length -= cur_len;
1222                 page_off = 0;
1223                 i++;
1224         }
1225
1226         if (padding) {
1227                 struct scatterlist pad_sg;
1228
1229                 sg_init_one(&pad_sg, pad_bytes, padding);
1230                 crypto_hash_update(hash, &pad_sg, padding);
1231         }
1232         crypto_hash_final(hash, (u8 *) &data_crc);
1233
1234         return data_crc;
1235 }
1236
1237 static void iscsit_do_crypto_hash_buf(
1238         struct hash_desc *hash,
1239         const void *buf,
1240         u32 payload_length,
1241         u32 padding,
1242         u8 *pad_bytes,
1243         u8 *data_crc)
1244 {
1245         struct scatterlist sg;
1246
1247         crypto_hash_init(hash);
1248
1249         sg_init_one(&sg, buf, payload_length);
1250         crypto_hash_update(hash, &sg, payload_length);
1251
1252         if (padding) {
1253                 sg_init_one(&sg, pad_bytes, padding);
1254                 crypto_hash_update(hash, &sg, padding);
1255         }
1256         crypto_hash_final(hash, data_crc);
1257 }
1258
1259 int
1260 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1261                           struct iscsi_cmd **out_cmd)
1262 {
1263         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1264         struct iscsi_cmd *cmd = NULL;
1265         struct se_cmd *se_cmd;
1266         u32 payload_length = ntoh24(hdr->dlength);
1267         int rc;
1268
1269         if (!payload_length) {
1270                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1271                 return 0;
1272         }
1273
1274         /* iSCSI write */
1275         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1276
1277         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1278                 pr_err("DataSegmentLength: %u is greater than"
1279                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1280                         conn->conn_ops->MaxXmitDataSegmentLength);
1281                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1282                                          buf);
1283         }
1284
1285         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1286                         payload_length);
1287         if (!cmd)
1288                 return 0;
1289
1290         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1291                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1292                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1293                 payload_length, conn->cid);
1294
1295         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1296                 pr_err("Command ITT: 0x%08x received DataOUT after"
1297                         " last DataOUT received, dumping payload\n",
1298                         cmd->init_task_tag);
1299                 return iscsit_dump_data_payload(conn, payload_length, 1);
1300         }
1301
1302         if (cmd->data_direction != DMA_TO_DEVICE) {
1303                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1304                         " NON-WRITE command.\n", cmd->init_task_tag);
1305                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1306         }
1307         se_cmd = &cmd->se_cmd;
1308         iscsit_mod_dataout_timer(cmd);
1309
1310         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1311                 pr_err("DataOut Offset: %u, Length %u greater than"
1312                         " iSCSI Command EDTL %u, protocol error.\n",
1313                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1314                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1315         }
1316
1317         if (cmd->unsolicited_data) {
1318                 int dump_unsolicited_data = 0;
1319
1320                 if (conn->sess->sess_ops->InitialR2T) {
1321                         pr_err("Received unexpected unsolicited data"
1322                                 " while InitialR2T=Yes, protocol error.\n");
1323                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1324                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1325                         return -1;
1326                 }
1327                 /*
1328                  * Special case for dealing with Unsolicited DataOUT
1329                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1330                  * failures;
1331                  */
1332
1333                 /* Something's amiss if we're not in WRITE_PENDING state... */
1334                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1335                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1336                         dump_unsolicited_data = 1;
1337
1338                 if (dump_unsolicited_data) {
1339                         /*
1340                          * Check if a delayed TASK_ABORTED status needs to
1341                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1342                          * received with the unsolicitied data out.
1343                          */
1344                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1345                                 iscsit_stop_dataout_timer(cmd);
1346
1347                         transport_check_aborted_status(se_cmd,
1348                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1349                         return iscsit_dump_data_payload(conn, payload_length, 1);
1350                 }
1351         } else {
1352                 /*
1353                  * For the normal solicited data path:
1354                  *
1355                  * Check for a delayed TASK_ABORTED status and dump any
1356                  * incoming data out payload if one exists.  Also, when the
1357                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1358                  * data out sequence, we decrement outstanding_r2ts.  Once
1359                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1360                  * TASK_ABORTED status.
1361                  */
1362                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1363                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1364                                 if (--cmd->outstanding_r2ts < 1) {
1365                                         iscsit_stop_dataout_timer(cmd);
1366                                         transport_check_aborted_status(
1367                                                         se_cmd, 1);
1368                                 }
1369
1370                         return iscsit_dump_data_payload(conn, payload_length, 1);
1371                 }
1372         }
1373         /*
1374          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1375          * within-command recovery checks before receiving the payload.
1376          */
1377         rc = iscsit_check_pre_dataout(cmd, buf);
1378         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1379                 return 0;
1380         else if (rc == DATAOUT_CANNOT_RECOVER)
1381                 return -1;
1382
1383         *out_cmd = cmd;
1384         return 0;
1385 }
1386 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1387
1388 static int
1389 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1390                    struct iscsi_data *hdr)
1391 {
1392         struct kvec *iov;
1393         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1394         u32 payload_length = ntoh24(hdr->dlength);
1395         int iov_ret, data_crc_failed = 0;
1396
1397         rx_size += payload_length;
1398         iov = &cmd->iov_data[0];
1399
1400         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1401                                    payload_length);
1402         if (iov_ret < 0)
1403                 return -1;
1404
1405         iov_count += iov_ret;
1406
1407         padding = ((-payload_length) & 3);
1408         if (padding != 0) {
1409                 iov[iov_count].iov_base = cmd->pad_bytes;
1410                 iov[iov_count++].iov_len = padding;
1411                 rx_size += padding;
1412                 pr_debug("Receiving %u padding bytes.\n", padding);
1413         }
1414
1415         if (conn->conn_ops->DataDigest) {
1416                 iov[iov_count].iov_base = &checksum;
1417                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1418                 rx_size += ISCSI_CRC_LEN;
1419         }
1420
1421         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1422
1423         iscsit_unmap_iovec(cmd);
1424
1425         if (rx_got != rx_size)
1426                 return -1;
1427
1428         if (conn->conn_ops->DataDigest) {
1429                 u32 data_crc;
1430
1431                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1432                                                     be32_to_cpu(hdr->offset),
1433                                                     payload_length, padding,
1434                                                     cmd->pad_bytes);
1435
1436                 if (checksum != data_crc) {
1437                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1438                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1439                                 " does not match computed 0x%08x\n",
1440                                 hdr->itt, hdr->offset, payload_length,
1441                                 hdr->datasn, checksum, data_crc);
1442                         data_crc_failed = 1;
1443                 } else {
1444                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1445                                 " %u bytes of Data Out\n", checksum,
1446                                 payload_length);
1447                 }
1448         }
1449
1450         return data_crc_failed;
1451 }
1452
1453 int
1454 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1455                              bool data_crc_failed)
1456 {
1457         struct iscsi_conn *conn = cmd->conn;
1458         int rc, ooo_cmdsn;
1459         /*
1460          * Increment post receive data and CRC values or perform
1461          * within-command recovery.
1462          */
1463         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1464         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1465                 return 0;
1466         else if (rc == DATAOUT_SEND_R2T) {
1467                 iscsit_set_dataout_sequence_values(cmd);
1468                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1469         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1470                 /*
1471                  * Handle extra special case for out of order
1472                  * Unsolicited Data Out.
1473                  */
1474                 spin_lock_bh(&cmd->istate_lock);
1475                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1476                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1477                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1478                 spin_unlock_bh(&cmd->istate_lock);
1479
1480                 iscsit_stop_dataout_timer(cmd);
1481                 if (ooo_cmdsn)
1482                         return 0;
1483                 target_execute_cmd(&cmd->se_cmd);
1484                 return 0;
1485         } else /* DATAOUT_CANNOT_RECOVER */
1486                 return -1;
1487
1488         return 0;
1489 }
1490 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1491
1492 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1493 {
1494         struct iscsi_cmd *cmd = NULL;
1495         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1496         int rc;
1497         bool data_crc_failed = false;
1498
1499         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1500         if (rc < 0)
1501                 return 0;
1502         else if (!cmd)
1503                 return 0;
1504
1505         rc = iscsit_get_dataout(conn, cmd, hdr);
1506         if (rc < 0)
1507                 return rc;
1508         else if (rc > 0)
1509                 data_crc_failed = true;
1510
1511         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1512 }
1513
1514 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1515                          struct iscsi_nopout *hdr)
1516 {
1517         u32 payload_length = ntoh24(hdr->dlength);
1518
1519         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1520                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1521                 if (!cmd)
1522                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1523                                                  (unsigned char *)hdr);
1524
1525                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1526                                          (unsigned char *)hdr);
1527         }
1528
1529         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1530                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1531                         " not set, protocol error.\n");
1532                 if (!cmd)
1533                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1534                                                  (unsigned char *)hdr);
1535
1536                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1537                                          (unsigned char *)hdr);
1538         }
1539
1540         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1541                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1542                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1543                         " error.\n", payload_length,
1544                         conn->conn_ops->MaxXmitDataSegmentLength);
1545                 if (!cmd)
1546                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1547                                                  (unsigned char *)hdr);
1548
1549                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1550                                          (unsigned char *)hdr);
1551         }
1552
1553         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1554                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1555                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1556                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1557                 payload_length);
1558         /*
1559          * This is not a response to a Unsolicited NopIN, which means
1560          * it can either be a NOPOUT ping request (with a valid ITT),
1561          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1562          * Either way, make sure we allocate an struct iscsi_cmd, as both
1563          * can contain ping data.
1564          */
1565         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1566                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1567                 cmd->i_state            = ISTATE_SEND_NOPIN;
1568                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1569                                                 1 : 0);
1570                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1571                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1572                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1573                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1574                 cmd->data_direction     = DMA_NONE;
1575         }
1576
1577         return 0;
1578 }
1579 EXPORT_SYMBOL(iscsit_setup_nop_out);
1580
1581 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1582                            struct iscsi_nopout *hdr)
1583 {
1584         struct iscsi_cmd *cmd_p = NULL;
1585         int cmdsn_ret = 0;
1586         /*
1587          * Initiator is expecting a NopIN ping reply..
1588          */
1589         if (hdr->itt != RESERVED_ITT) {
1590                 BUG_ON(!cmd);
1591
1592                 spin_lock_bh(&conn->cmd_lock);
1593                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1594                 spin_unlock_bh(&conn->cmd_lock);
1595
1596                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1597
1598                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1599                         iscsit_add_cmd_to_response_queue(cmd, conn,
1600                                                          cmd->i_state);
1601                         return 0;
1602                 }
1603
1604                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1605                                 (unsigned char *)hdr, hdr->cmdsn);
1606                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1607                         return 0;
1608                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1609                         return -1;
1610
1611                 return 0;
1612         }
1613         /*
1614          * This was a response to a unsolicited NOPIN ping.
1615          */
1616         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1617                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1618                 if (!cmd_p)
1619                         return -EINVAL;
1620
1621                 iscsit_stop_nopin_response_timer(conn);
1622
1623                 cmd_p->i_state = ISTATE_REMOVE;
1624                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1625
1626                 iscsit_start_nopin_timer(conn);
1627                 return 0;
1628         }
1629         /*
1630          * Otherwise, initiator is not expecting a NOPIN is response.
1631          * Just ignore for now.
1632          */
1633         return 0;
1634 }
1635 EXPORT_SYMBOL(iscsit_process_nop_out);
1636
1637 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1638                                  unsigned char *buf)
1639 {
1640         unsigned char *ping_data = NULL;
1641         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1642         struct kvec *iov = NULL;
1643         u32 payload_length = ntoh24(hdr->dlength);
1644         int ret;
1645
1646         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1647         if (ret < 0)
1648                 return 0;
1649         /*
1650          * Handle NOP-OUT payload for traditional iSCSI sockets
1651          */
1652         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1653                 u32 checksum, data_crc, padding = 0;
1654                 int niov = 0, rx_got, rx_size = payload_length;
1655
1656                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1657                 if (!ping_data) {
1658                         pr_err("Unable to allocate memory for"
1659                                 " NOPOUT ping data.\n");
1660                         ret = -1;
1661                         goto out;
1662                 }
1663
1664                 iov = &cmd->iov_misc[0];
1665                 iov[niov].iov_base      = ping_data;
1666                 iov[niov++].iov_len     = payload_length;
1667
1668                 padding = ((-payload_length) & 3);
1669                 if (padding != 0) {
1670                         pr_debug("Receiving %u additional bytes"
1671                                 " for padding.\n", padding);
1672                         iov[niov].iov_base      = &cmd->pad_bytes;
1673                         iov[niov++].iov_len     = padding;
1674                         rx_size += padding;
1675                 }
1676                 if (conn->conn_ops->DataDigest) {
1677                         iov[niov].iov_base      = &checksum;
1678                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1679                         rx_size += ISCSI_CRC_LEN;
1680                 }
1681
1682                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1683                 if (rx_got != rx_size) {
1684                         ret = -1;
1685                         goto out;
1686                 }
1687
1688                 if (conn->conn_ops->DataDigest) {
1689                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1690                                         ping_data, payload_length,
1691                                         padding, cmd->pad_bytes,
1692                                         (u8 *)&data_crc);
1693
1694                         if (checksum != data_crc) {
1695                                 pr_err("Ping data CRC32C DataDigest"
1696                                 " 0x%08x does not match computed 0x%08x\n",
1697                                         checksum, data_crc);
1698                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1699                                         pr_err("Unable to recover from"
1700                                         " NOPOUT Ping DataCRC failure while in"
1701                                                 " ERL=0.\n");
1702                                         ret = -1;
1703                                         goto out;
1704                                 } else {
1705                                         /*
1706                                          * Silently drop this PDU and let the
1707                                          * initiator plug the CmdSN gap.
1708                                          */
1709                                         pr_debug("Dropping NOPOUT"
1710                                         " Command CmdSN: 0x%08x due to"
1711                                         " DataCRC error.\n", hdr->cmdsn);
1712                                         ret = 0;
1713                                         goto out;
1714                                 }
1715                         } else {
1716                                 pr_debug("Got CRC32C DataDigest"
1717                                 " 0x%08x for %u bytes of ping data.\n",
1718                                         checksum, payload_length);
1719                         }
1720                 }
1721
1722                 ping_data[payload_length] = '\0';
1723                 /*
1724                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1725                  */
1726                 cmd->buf_ptr = ping_data;
1727                 cmd->buf_ptr_size = payload_length;
1728
1729                 pr_debug("Got %u bytes of NOPOUT ping"
1730                         " data.\n", payload_length);
1731                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1732         }
1733
1734         return iscsit_process_nop_out(conn, cmd, hdr);
1735 out:
1736         if (cmd)
1737                 iscsit_free_cmd(cmd, false);
1738
1739         kfree(ping_data);
1740         return ret;
1741 }
1742
1743 int
1744 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1745                            unsigned char *buf)
1746 {
1747         struct se_tmr_req *se_tmr;
1748         struct iscsi_tmr_req *tmr_req;
1749         struct iscsi_tm *hdr;
1750         int out_of_order_cmdsn = 0, ret;
1751         bool sess_ref = false;
1752         u8 function;
1753
1754         hdr                     = (struct iscsi_tm *) buf;
1755         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1756         function = hdr->flags;
1757
1758         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1759                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1760                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1761                 hdr->rtt, hdr->refcmdsn, conn->cid);
1762
1763         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1764             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1765              hdr->rtt != RESERVED_ITT)) {
1766                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1767                 hdr->rtt = RESERVED_ITT;
1768         }
1769
1770         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1771                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1772                 pr_err("Task Management Request TASK_REASSIGN not"
1773                         " issued as immediate command, bad iSCSI Initiator"
1774                                 "implementation\n");
1775                 return iscsit_add_reject_cmd(cmd,
1776                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1777         }
1778         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1779             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1780                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1781
1782         cmd->data_direction = DMA_NONE;
1783
1784         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1785         if (!cmd->tmr_req) {
1786                 pr_err("Unable to allocate memory for"
1787                         " Task Management command!\n");
1788                 return iscsit_add_reject_cmd(cmd,
1789                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1790                                              buf);
1791         }
1792
1793         /*
1794          * TASK_REASSIGN for ERL=2 / connection stays inside of
1795          * LIO-Target $FABRIC_MOD
1796          */
1797         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1798
1799                 u8 tcm_function;
1800                 int ret;
1801
1802                 transport_init_se_cmd(&cmd->se_cmd,
1803                                       &lio_target_fabric_configfs->tf_ops,
1804                                       conn->sess->se_sess, 0, DMA_NONE,
1805                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1806
1807                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1808                 sess_ref = true;
1809
1810                 switch (function) {
1811                 case ISCSI_TM_FUNC_ABORT_TASK:
1812                         tcm_function = TMR_ABORT_TASK;
1813                         break;
1814                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1815                         tcm_function = TMR_ABORT_TASK_SET;
1816                         break;
1817                 case ISCSI_TM_FUNC_CLEAR_ACA:
1818                         tcm_function = TMR_CLEAR_ACA;
1819                         break;
1820                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1821                         tcm_function = TMR_CLEAR_TASK_SET;
1822                         break;
1823                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1824                         tcm_function = TMR_LUN_RESET;
1825                         break;
1826                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1827                         tcm_function = TMR_TARGET_WARM_RESET;
1828                         break;
1829                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1830                         tcm_function = TMR_TARGET_COLD_RESET;
1831                         break;
1832                 default:
1833                         pr_err("Unknown iSCSI TMR Function:"
1834                                " 0x%02x\n", function);
1835                         return iscsit_add_reject_cmd(cmd,
1836                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1837                 }
1838
1839                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1840                                          tcm_function, GFP_KERNEL);
1841                 if (ret < 0)
1842                         return iscsit_add_reject_cmd(cmd,
1843                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1844
1845                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1846         }
1847
1848         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1849         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1850         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1851         cmd->init_task_tag      = hdr->itt;
1852         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1853         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1854         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1855         se_tmr                  = cmd->se_cmd.se_tmr_req;
1856         tmr_req                 = cmd->tmr_req;
1857         /*
1858          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1859          */
1860         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1861                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1862                                                scsilun_to_int(&hdr->lun));
1863                 if (ret < 0) {
1864                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1865                         goto attach;
1866                 }
1867         }
1868
1869         switch (function) {
1870         case ISCSI_TM_FUNC_ABORT_TASK:
1871                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1872                 if (se_tmr->response)
1873                         goto attach;
1874                 break;
1875         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1876         case ISCSI_TM_FUNC_CLEAR_ACA:
1877         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1878         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1879                 break;
1880         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1881                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1882                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1883                         goto attach;
1884                 }
1885                 break;
1886         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1887                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1888                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1889                         goto attach;
1890                 }
1891                 break;
1892         case ISCSI_TM_FUNC_TASK_REASSIGN:
1893                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1894                 /*
1895                  * Perform sanity checks on the ExpDataSN only if the
1896                  * TASK_REASSIGN was successful.
1897                  */
1898                 if (se_tmr->response)
1899                         break;
1900
1901                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1902                         return iscsit_add_reject_cmd(cmd,
1903                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1904                 break;
1905         default:
1906                 pr_err("Unknown TMR function: 0x%02x, protocol"
1907                         " error.\n", function);
1908                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1909                 goto attach;
1910         }
1911
1912         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1913             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1914                 se_tmr->call_transport = 1;
1915 attach:
1916         spin_lock_bh(&conn->cmd_lock);
1917         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1918         spin_unlock_bh(&conn->cmd_lock);
1919
1920         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1921                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1922                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1923                         out_of_order_cmdsn = 1;
1924                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1925                         return 0;
1926                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1927                         return -1;
1928         }
1929         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1930
1931         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1932                 return 0;
1933         /*
1934          * Found the referenced task, send to transport for processing.
1935          */
1936         if (se_tmr->call_transport)
1937                 return transport_generic_handle_tmr(&cmd->se_cmd);
1938
1939         /*
1940          * Could not find the referenced LUN, task, or Task Management
1941          * command not authorized or supported.  Change state and
1942          * let the tx_thread send the response.
1943          *
1944          * For connection recovery, this is also the default action for
1945          * TMR TASK_REASSIGN.
1946          */
1947         if (sess_ref) {
1948                 pr_debug("Handle TMR, using sess_ref=true check\n");
1949                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1950         }
1951
1952         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1953         return 0;
1954 }
1955 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1956
1957 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1958 int
1959 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1960                       struct iscsi_text *hdr)
1961 {
1962         u32 payload_length = ntoh24(hdr->dlength);
1963
1964         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1965                 pr_err("Unable to accept text parameter length: %u"
1966                         "greater than MaxXmitDataSegmentLength %u.\n",
1967                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1968                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1969                                          (unsigned char *)hdr);
1970         }
1971
1972         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1973              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1974                 pr_err("Multi sequence text commands currently not supported\n");
1975                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1976                                         (unsigned char *)hdr);
1977         }
1978
1979         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1980                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1981                 hdr->exp_statsn, payload_length);
1982
1983         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1984         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1985         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1986         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1987         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1988         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1989         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1990         cmd->data_direction     = DMA_NONE;
1991
1992         return 0;
1993 }
1994 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1995
1996 int
1997 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1998                         struct iscsi_text *hdr)
1999 {
2000         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2001         int cmdsn_ret;
2002
2003         if (!text_in) {
2004                 pr_err("Unable to locate text_in buffer for sendtargets"
2005                        " discovery\n");
2006                 goto reject;
2007         }
2008         if (strncmp("SendTargets", text_in, 11) != 0) {
2009                 pr_err("Received Text Data that is not"
2010                         " SendTargets, cannot continue.\n");
2011                 goto reject;
2012         }
2013         text_ptr = strchr(text_in, '=');
2014         if (!text_ptr) {
2015                 pr_err("No \"=\" separator found in Text Data,"
2016                         "  cannot continue.\n");
2017                 goto reject;
2018         }
2019         if (!strncmp("=All", text_ptr, 4)) {
2020                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2021         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2022                    !strncmp("=eui.", text_ptr, 5)) {
2023                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2024         } else {
2025                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2026                 goto reject;
2027         }
2028
2029         spin_lock_bh(&conn->cmd_lock);
2030         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2031         spin_unlock_bh(&conn->cmd_lock);
2032
2033         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2034
2035         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2036                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2037                                 (unsigned char *)hdr, hdr->cmdsn);
2038                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2039                         return -1;
2040
2041                 return 0;
2042         }
2043
2044         return iscsit_execute_cmd(cmd, 0);
2045
2046 reject:
2047         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2048                                  (unsigned char *)hdr);
2049 }
2050 EXPORT_SYMBOL(iscsit_process_text_cmd);
2051
2052 static int
2053 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2054                        unsigned char *buf)
2055 {
2056         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2057         char *text_in = NULL;
2058         u32 payload_length = ntoh24(hdr->dlength);
2059         int rx_size, rc;
2060
2061         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2062         if (rc < 0)
2063                 return 0;
2064
2065         rx_size = payload_length;
2066         if (payload_length) {
2067                 u32 checksum = 0, data_crc = 0;
2068                 u32 padding = 0, pad_bytes = 0;
2069                 int niov = 0, rx_got;
2070                 struct kvec iov[3];
2071
2072                 text_in = kzalloc(payload_length, GFP_KERNEL);
2073                 if (!text_in) {
2074                         pr_err("Unable to allocate memory for"
2075                                 " incoming text parameters\n");
2076                         goto reject;
2077                 }
2078                 cmd->text_in_ptr = text_in;
2079
2080                 memset(iov, 0, 3 * sizeof(struct kvec));
2081                 iov[niov].iov_base      = text_in;
2082                 iov[niov++].iov_len     = payload_length;
2083
2084                 padding = ((-payload_length) & 3);
2085                 if (padding != 0) {
2086                         iov[niov].iov_base = &pad_bytes;
2087                         iov[niov++].iov_len  = padding;
2088                         rx_size += padding;
2089                         pr_debug("Receiving %u additional bytes"
2090                                         " for padding.\n", padding);
2091                 }
2092                 if (conn->conn_ops->DataDigest) {
2093                         iov[niov].iov_base      = &checksum;
2094                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2095                         rx_size += ISCSI_CRC_LEN;
2096                 }
2097
2098                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2099                 if (rx_got != rx_size)
2100                         goto reject;
2101
2102                 if (conn->conn_ops->DataDigest) {
2103                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2104                                         text_in, payload_length,
2105                                         padding, (u8 *)&pad_bytes,
2106                                         (u8 *)&data_crc);
2107
2108                         if (checksum != data_crc) {
2109                                 pr_err("Text data CRC32C DataDigest"
2110                                         " 0x%08x does not match computed"
2111                                         " 0x%08x\n", checksum, data_crc);
2112                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2113                                         pr_err("Unable to recover from"
2114                                         " Text Data digest failure while in"
2115                                                 " ERL=0.\n");
2116                                         goto reject;
2117                                 } else {
2118                                         /*
2119                                          * Silently drop this PDU and let the
2120                                          * initiator plug the CmdSN gap.
2121                                          */
2122                                         pr_debug("Dropping Text"
2123                                         " Command CmdSN: 0x%08x due to"
2124                                         " DataCRC error.\n", hdr->cmdsn);
2125                                         kfree(text_in);
2126                                         return 0;
2127                                 }
2128                         } else {
2129                                 pr_debug("Got CRC32C DataDigest"
2130                                         " 0x%08x for %u bytes of text data.\n",
2131                                                 checksum, payload_length);
2132                         }
2133                 }
2134                 text_in[payload_length - 1] = '\0';
2135                 pr_debug("Successfully read %d bytes of text"
2136                                 " data.\n", payload_length);
2137         }
2138
2139         return iscsit_process_text_cmd(conn, cmd, hdr);
2140
2141 reject:
2142         kfree(cmd->text_in_ptr);
2143         cmd->text_in_ptr = NULL;
2144         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2145 }
2146 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2147
2148 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2149 {
2150         struct iscsi_conn *conn_p;
2151         struct iscsi_session *sess = conn->sess;
2152
2153         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2154                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2155
2156         atomic_set(&sess->session_logout, 1);
2157         atomic_set(&conn->conn_logout_remove, 1);
2158         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2159
2160         iscsit_inc_conn_usage_count(conn);
2161         iscsit_inc_session_usage_count(sess);
2162
2163         spin_lock_bh(&sess->conn_lock);
2164         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2165                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2166                         continue;
2167
2168                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2169                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2170         }
2171         spin_unlock_bh(&sess->conn_lock);
2172
2173         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2174
2175         return 0;
2176 }
2177
2178 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2179 {
2180         struct iscsi_conn *l_conn;
2181         struct iscsi_session *sess = conn->sess;
2182
2183         pr_debug("Received logout request CLOSECONNECTION for CID:"
2184                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2185
2186         /*
2187          * A Logout Request with a CLOSECONNECTION reason code for a CID
2188          * can arrive on a connection with a differing CID.
2189          */
2190         if (conn->cid == cmd->logout_cid) {
2191                 spin_lock_bh(&conn->state_lock);
2192                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2193                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2194
2195                 atomic_set(&conn->conn_logout_remove, 1);
2196                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2197                 iscsit_inc_conn_usage_count(conn);
2198
2199                 spin_unlock_bh(&conn->state_lock);
2200         } else {
2201                 /*
2202                  * Handle all different cid CLOSECONNECTION requests in
2203                  * iscsit_logout_post_handler_diffcid() as to give enough
2204                  * time for any non immediate command's CmdSN to be
2205                  * acknowledged on the connection in question.
2206                  *
2207                  * Here we simply make sure the CID is still around.
2208                  */
2209                 l_conn = iscsit_get_conn_from_cid(sess,
2210                                 cmd->logout_cid);
2211                 if (!l_conn) {
2212                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2213                         iscsit_add_cmd_to_response_queue(cmd, conn,
2214                                         cmd->i_state);
2215                         return 0;
2216                 }
2217
2218                 iscsit_dec_conn_usage_count(l_conn);
2219         }
2220
2221         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2222
2223         return 0;
2224 }
2225
2226 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2227 {
2228         struct iscsi_session *sess = conn->sess;
2229
2230         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2231                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2232
2233         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2234                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2235                         " while ERL!=2.\n");
2236                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2237                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2238                 return 0;
2239         }
2240
2241         if (conn->cid == cmd->logout_cid) {
2242                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2243                         " with CID: %hu on CID: %hu, implementation error.\n",
2244                                 cmd->logout_cid, conn->cid);
2245                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2246                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2247                 return 0;
2248         }
2249
2250         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2251
2252         return 0;
2253 }
2254
2255 int
2256 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2257                         unsigned char *buf)
2258 {
2259         int cmdsn_ret, logout_remove = 0;
2260         u8 reason_code = 0;
2261         struct iscsi_logout *hdr;
2262         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2263
2264         hdr                     = (struct iscsi_logout *) buf;
2265         reason_code             = (hdr->flags & 0x7f);
2266
2267         if (tiqn) {
2268                 spin_lock(&tiqn->logout_stats.lock);
2269                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2270                         tiqn->logout_stats.normal_logouts++;
2271                 else
2272                         tiqn->logout_stats.abnormal_logouts++;
2273                 spin_unlock(&tiqn->logout_stats.lock);
2274         }
2275
2276         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2277                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2278                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2279                 hdr->cid, conn->cid);
2280
2281         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2282                 pr_err("Received logout request on connection that"
2283                         " is not in logged in state, ignoring request.\n");
2284                 iscsit_free_cmd(cmd, false);
2285                 return 0;
2286         }
2287
2288         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2289         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2290         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2291         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2292         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2293         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2294         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2295         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2296         cmd->logout_reason      = reason_code;
2297         cmd->data_direction     = DMA_NONE;
2298
2299         /*
2300          * We need to sleep in these cases (by returning 1) until the Logout
2301          * Response gets sent in the tx thread.
2302          */
2303         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2304            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2305             be16_to_cpu(hdr->cid) == conn->cid))
2306                 logout_remove = 1;
2307
2308         spin_lock_bh(&conn->cmd_lock);
2309         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2310         spin_unlock_bh(&conn->cmd_lock);
2311
2312         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2313                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2314
2315         /*
2316          * Immediate commands are executed, well, immediately.
2317          * Non-Immediate Logout Commands are executed in CmdSN order.
2318          */
2319         if (cmd->immediate_cmd) {
2320                 int ret = iscsit_execute_cmd(cmd, 0);
2321
2322                 if (ret < 0)
2323                         return ret;
2324         } else {
2325                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2326                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2327                         logout_remove = 0;
2328                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2329                         return -1;
2330         }
2331
2332         return logout_remove;
2333 }
2334 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2335
2336 static int iscsit_handle_snack(
2337         struct iscsi_conn *conn,
2338         unsigned char *buf)
2339 {
2340         struct iscsi_snack *hdr;
2341
2342         hdr                     = (struct iscsi_snack *) buf;
2343         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2344
2345         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2346                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2347                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2348                         hdr->begrun, hdr->runlength, conn->cid);
2349
2350         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2351                 pr_err("Initiator sent SNACK request while in"
2352                         " ErrorRecoveryLevel=0.\n");
2353                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2354                                          buf);
2355         }
2356         /*
2357          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2358          * call from inside iscsi_send_recovery_datain_or_r2t().
2359          */
2360         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2361         case 0:
2362                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2363                         hdr->itt,
2364                         be32_to_cpu(hdr->ttt),
2365                         be32_to_cpu(hdr->begrun),
2366                         be32_to_cpu(hdr->runlength));
2367         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2368                 return iscsit_handle_status_snack(conn, hdr->itt,
2369                         be32_to_cpu(hdr->ttt),
2370                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2371         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2372                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2373                         be32_to_cpu(hdr->begrun),
2374                         be32_to_cpu(hdr->runlength));
2375         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2376                 /* FIXME: Support R-Data SNACK */
2377                 pr_err("R-Data SNACK Not Supported.\n");
2378                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2379                                          buf);
2380         default:
2381                 pr_err("Unknown SNACK type 0x%02x, protocol"
2382                         " error.\n", hdr->flags & 0x0f);
2383                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2384                                          buf);
2385         }
2386
2387         return 0;
2388 }
2389
2390 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2391 {
2392         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2393             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2394                 wait_for_completion_interruptible_timeout(
2395                                         &conn->rx_half_close_comp,
2396                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2397         }
2398 }
2399
2400 static int iscsit_handle_immediate_data(
2401         struct iscsi_cmd *cmd,
2402         struct iscsi_scsi_req *hdr,
2403         u32 length)
2404 {
2405         int iov_ret, rx_got = 0, rx_size = 0;
2406         u32 checksum, iov_count = 0, padding = 0;
2407         struct iscsi_conn *conn = cmd->conn;
2408         struct kvec *iov;
2409
2410         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2411         if (iov_ret < 0)
2412                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2413
2414         rx_size = length;
2415         iov_count = iov_ret;
2416         iov = &cmd->iov_data[0];
2417
2418         padding = ((-length) & 3);
2419         if (padding != 0) {
2420                 iov[iov_count].iov_base = cmd->pad_bytes;
2421                 iov[iov_count++].iov_len = padding;
2422                 rx_size += padding;
2423         }
2424
2425         if (conn->conn_ops->DataDigest) {
2426                 iov[iov_count].iov_base         = &checksum;
2427                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2428                 rx_size += ISCSI_CRC_LEN;
2429         }
2430
2431         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2432
2433         iscsit_unmap_iovec(cmd);
2434
2435         if (rx_got != rx_size) {
2436                 iscsit_rx_thread_wait_for_tcp(conn);
2437                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2438         }
2439
2440         if (conn->conn_ops->DataDigest) {
2441                 u32 data_crc;
2442
2443                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2444                                                     cmd->write_data_done, length, padding,
2445                                                     cmd->pad_bytes);
2446
2447                 if (checksum != data_crc) {
2448                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2449                                 " does not match computed 0x%08x\n", checksum,
2450                                 data_crc);
2451
2452                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2453                                 pr_err("Unable to recover from"
2454                                         " Immediate Data digest failure while"
2455                                         " in ERL=0.\n");
2456                                 iscsit_reject_cmd(cmd,
2457                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2458                                                 (unsigned char *)hdr);
2459                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2460                         } else {
2461                                 iscsit_reject_cmd(cmd,
2462                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2463                                                 (unsigned char *)hdr);
2464                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2465                         }
2466                 } else {
2467                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2468                                 " %u bytes of Immediate Data\n", checksum,
2469                                 length);
2470                 }
2471         }
2472
2473         cmd->write_data_done += length;
2474
2475         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2476                 spin_lock_bh(&cmd->istate_lock);
2477                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2478                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2479                 spin_unlock_bh(&cmd->istate_lock);
2480         }
2481
2482         return IMMEDIATE_DATA_NORMAL_OPERATION;
2483 }
2484
2485 /*
2486  *      Called with sess->conn_lock held.
2487  */
2488 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2489         with active network interface */
2490 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2491 {
2492         struct iscsi_cmd *cmd;
2493         struct iscsi_conn *conn_p;
2494         bool found = false;
2495
2496         /*
2497          * Only send a Asynchronous Message on connections whos network
2498          * interface is still functional.
2499          */
2500         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2501                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2502                         iscsit_inc_conn_usage_count(conn_p);
2503                         found = true;
2504                         break;
2505                 }
2506         }
2507
2508         if (!found)
2509                 return;
2510
2511         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2512         if (!cmd) {
2513                 iscsit_dec_conn_usage_count(conn_p);
2514                 return;
2515         }
2516
2517         cmd->logout_cid = conn->cid;
2518         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2519         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2520
2521         spin_lock_bh(&conn_p->cmd_lock);
2522         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2523         spin_unlock_bh(&conn_p->cmd_lock);
2524
2525         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2526         iscsit_dec_conn_usage_count(conn_p);
2527 }
2528
2529 static int iscsit_send_conn_drop_async_message(
2530         struct iscsi_cmd *cmd,
2531         struct iscsi_conn *conn)
2532 {
2533         struct iscsi_async *hdr;
2534
2535         cmd->tx_size = ISCSI_HDR_LEN;
2536         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2537
2538         hdr                     = (struct iscsi_async *) cmd->pdu;
2539         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2540         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2541         cmd->init_task_tag      = RESERVED_ITT;
2542         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2543         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2544         cmd->stat_sn            = conn->stat_sn++;
2545         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2546         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2547         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2548         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2549         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2550         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2551         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2552
2553         if (conn->conn_ops->HeaderDigest) {
2554                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2555
2556                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2557                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2558
2559                 cmd->tx_size += ISCSI_CRC_LEN;
2560                 pr_debug("Attaching CRC32C HeaderDigest to"
2561                         " Async Message 0x%08x\n", *header_digest);
2562         }
2563
2564         cmd->iov_misc[0].iov_base       = cmd->pdu;
2565         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2566         cmd->iov_misc_count             = 1;
2567
2568         pr_debug("Sending Connection Dropped Async Message StatSN:"
2569                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2570                         cmd->logout_cid, conn->cid);
2571         return 0;
2572 }
2573
2574 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2575 {
2576         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2577             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2578                 wait_for_completion_interruptible_timeout(
2579                                         &conn->tx_half_close_comp,
2580                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2581         }
2582 }
2583
2584 static void
2585 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2586                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2587                         bool set_statsn)
2588 {
2589         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2590         hdr->flags              = datain->flags;
2591         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2592                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2593                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2594                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2595                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2596                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2597                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2598                 }
2599         }
2600         hton24(hdr->dlength, datain->length);
2601         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2602                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2603                                 (struct scsi_lun *)&hdr->lun);
2604         else
2605                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2606
2607         hdr->itt                = cmd->init_task_tag;
2608
2609         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2610                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2611         else
2612                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2613         if (set_statsn)
2614                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2615         else
2616                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2617
2618         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2619         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2620         hdr->datasn             = cpu_to_be32(datain->data_sn);
2621         hdr->offset             = cpu_to_be32(datain->offset);
2622
2623         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2624                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2625                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2626                 ntohl(hdr->offset), datain->length, conn->cid);
2627 }
2628
2629 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2630 {
2631         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2632         struct iscsi_datain datain;
2633         struct iscsi_datain_req *dr;
2634         struct kvec *iov;
2635         u32 iov_count = 0, tx_size = 0;
2636         int eodr = 0, ret, iov_ret;
2637         bool set_statsn = false;
2638
2639         memset(&datain, 0, sizeof(struct iscsi_datain));
2640         dr = iscsit_get_datain_values(cmd, &datain);
2641         if (!dr) {
2642                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2643                                 cmd->init_task_tag);
2644                 return -1;
2645         }
2646         /*
2647          * Be paranoid and double check the logic for now.
2648          */
2649         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2650                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2651                         " datain.length: %u exceeds cmd->data_length: %u\n",
2652                         cmd->init_task_tag, datain.offset, datain.length,
2653                         cmd->se_cmd.data_length);
2654                 return -1;
2655         }
2656
2657         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2658         /*
2659          * Special case for successfully execution w/ both DATAIN
2660          * and Sense Data.
2661          */
2662         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2663             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2664                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2665         else {
2666                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2667                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2668                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2669                         cmd->stat_sn = conn->stat_sn++;
2670                         set_statsn = true;
2671                 } else if (dr->dr_complete ==
2672                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2673                         set_statsn = true;
2674         }
2675
2676         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2677
2678         iov = &cmd->iov_data[0];
2679         iov[iov_count].iov_base = cmd->pdu;
2680         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2681         tx_size += ISCSI_HDR_LEN;
2682
2683         if (conn->conn_ops->HeaderDigest) {
2684                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2685
2686                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2687                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2688
2689                 iov[0].iov_len += ISCSI_CRC_LEN;
2690                 tx_size += ISCSI_CRC_LEN;
2691
2692                 pr_debug("Attaching CRC32 HeaderDigest"
2693                         " for DataIN PDU 0x%08x\n", *header_digest);
2694         }
2695
2696         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2697                                 datain.offset, datain.length);
2698         if (iov_ret < 0)
2699                 return -1;
2700
2701         iov_count += iov_ret;
2702         tx_size += datain.length;
2703
2704         cmd->padding = ((-datain.length) & 3);
2705         if (cmd->padding) {
2706                 iov[iov_count].iov_base         = cmd->pad_bytes;
2707                 iov[iov_count++].iov_len        = cmd->padding;
2708                 tx_size += cmd->padding;
2709
2710                 pr_debug("Attaching %u padding bytes\n",
2711                                 cmd->padding);
2712         }
2713         if (conn->conn_ops->DataDigest) {
2714                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2715                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2716
2717                 iov[iov_count].iov_base = &cmd->data_crc;
2718                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2719                 tx_size += ISCSI_CRC_LEN;
2720
2721                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2722                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2723         }
2724
2725         cmd->iov_data_count = iov_count;
2726         cmd->tx_size = tx_size;
2727
2728         /* sendpage is preferred but can't insert markers */
2729         if (!conn->conn_ops->IFMarker)
2730                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2731         else
2732                 ret = iscsit_send_tx_data(cmd, conn, 0);
2733
2734         iscsit_unmap_iovec(cmd);
2735
2736         if (ret < 0) {
2737                 iscsit_tx_thread_wait_for_tcp(conn);
2738                 return ret;
2739         }
2740
2741         if (dr->dr_complete) {
2742                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2743                                 2 : 1;
2744                 iscsit_free_datain_req(cmd, dr);
2745         }
2746
2747         return eodr;
2748 }
2749
2750 int
2751 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2752                         struct iscsi_logout_rsp *hdr)
2753 {
2754         struct iscsi_conn *logout_conn = NULL;
2755         struct iscsi_conn_recovery *cr = NULL;
2756         struct iscsi_session *sess = conn->sess;
2757         /*
2758          * The actual shutting down of Sessions and/or Connections
2759          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2760          * is done in scsi_logout_post_handler().
2761          */
2762         switch (cmd->logout_reason) {
2763         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2764                 pr_debug("iSCSI session logout successful, setting"
2765                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2766                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2767                 break;
2768         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2769                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2770                         break;
2771                 /*
2772                  * For CLOSECONNECTION logout requests carrying
2773                  * a matching logout CID -> local CID, the reference
2774                  * for the local CID will have been incremented in
2775                  * iscsi_logout_closeconnection().
2776                  *
2777                  * For CLOSECONNECTION logout requests carrying
2778                  * a different CID than the connection it arrived
2779                  * on, the connection responding to cmd->logout_cid
2780                  * is stopped in iscsit_logout_post_handler_diffcid().
2781                  */
2782
2783                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2784                         " successful.\n", cmd->logout_cid, conn->cid);
2785                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2786                 break;
2787         case ISCSI_LOGOUT_REASON_RECOVERY:
2788                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2789                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2790                         break;
2791                 /*
2792                  * If the connection is still active from our point of view
2793                  * force connection recovery to occur.
2794                  */
2795                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2796                                 cmd->logout_cid);
2797                 if (logout_conn) {
2798                         iscsit_connection_reinstatement_rcfr(logout_conn);
2799                         iscsit_dec_conn_usage_count(logout_conn);
2800                 }
2801
2802                 cr = iscsit_get_inactive_connection_recovery_entry(
2803                                 conn->sess, cmd->logout_cid);
2804                 if (!cr) {
2805                         pr_err("Unable to locate CID: %hu for"
2806                         " REMOVECONNFORRECOVERY Logout Request.\n",
2807                                 cmd->logout_cid);
2808                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2809                         break;
2810                 }
2811
2812                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2813
2814                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2815                         " for recovery for CID: %hu on CID: %hu successful.\n",
2816                                 cmd->logout_cid, conn->cid);
2817                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2818                 break;
2819         default:
2820                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2821                                 cmd->logout_reason);
2822                 return -1;
2823         }
2824
2825         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2826         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2827         hdr->response           = cmd->logout_response;
2828         hdr->itt                = cmd->init_task_tag;
2829         cmd->stat_sn            = conn->stat_sn++;
2830         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2831
2832         iscsit_increment_maxcmdsn(cmd, conn->sess);
2833         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2834         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2835
2836         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2837                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2838                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2839                 cmd->logout_cid, conn->cid);
2840
2841         return 0;
2842 }
2843 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2844
2845 static int
2846 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2847 {
2848         struct kvec *iov;
2849         int niov = 0, tx_size, rc;
2850
2851         rc = iscsit_build_logout_rsp(cmd, conn,
2852                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2853         if (rc < 0)
2854                 return rc;
2855
2856         tx_size = ISCSI_HDR_LEN;
2857         iov = &cmd->iov_misc[0];
2858         iov[niov].iov_base      = cmd->pdu;
2859         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2860
2861         if (conn->conn_ops->HeaderDigest) {
2862                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2863
2864                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2865                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2866
2867                 iov[0].iov_len += ISCSI_CRC_LEN;
2868                 tx_size += ISCSI_CRC_LEN;
2869                 pr_debug("Attaching CRC32C HeaderDigest to"
2870                         " Logout Response 0x%08x\n", *header_digest);
2871         }
2872         cmd->iov_misc_count = niov;
2873         cmd->tx_size = tx_size;
2874
2875         return 0;
2876 }
2877
2878 void
2879 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2880                        struct iscsi_nopin *hdr, bool nopout_response)
2881 {
2882         hdr->opcode             = ISCSI_OP_NOOP_IN;
2883         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2884         hton24(hdr->dlength, cmd->buf_ptr_size);
2885         if (nopout_response)
2886                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2887         hdr->itt                = cmd->init_task_tag;
2888         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2889         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2890                                   conn->stat_sn;
2891         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2892
2893         if (nopout_response)
2894                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2895
2896         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2897         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2898
2899         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2900                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2901                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2902                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2903 }
2904 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2905
2906 /*
2907  *      Unsolicited NOPIN, either requesting a response or not.
2908  */
2909 static int iscsit_send_unsolicited_nopin(
2910         struct iscsi_cmd *cmd,
2911         struct iscsi_conn *conn,
2912         int want_response)
2913 {
2914         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2915         int tx_size = ISCSI_HDR_LEN, ret;
2916
2917         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2918
2919         if (conn->conn_ops->HeaderDigest) {
2920                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2921
2922                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2923                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2924
2925                 tx_size += ISCSI_CRC_LEN;
2926                 pr_debug("Attaching CRC32C HeaderDigest to"
2927                         " NopIN 0x%08x\n", *header_digest);
2928         }
2929
2930         cmd->iov_misc[0].iov_base       = cmd->pdu;
2931         cmd->iov_misc[0].iov_len        = tx_size;
2932         cmd->iov_misc_count     = 1;
2933         cmd->tx_size            = tx_size;
2934
2935         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2936                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2937
2938         ret = iscsit_send_tx_data(cmd, conn, 1);
2939         if (ret < 0) {
2940                 iscsit_tx_thread_wait_for_tcp(conn);
2941                 return ret;
2942         }
2943
2944         spin_lock_bh(&cmd->istate_lock);
2945         cmd->i_state = want_response ?
2946                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2947         spin_unlock_bh(&cmd->istate_lock);
2948
2949         return 0;
2950 }
2951
2952 static int
2953 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2954 {
2955         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2956         struct kvec *iov;
2957         u32 padding = 0;
2958         int niov = 0, tx_size;
2959
2960         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2961
2962         tx_size = ISCSI_HDR_LEN;
2963         iov = &cmd->iov_misc[0];
2964         iov[niov].iov_base      = cmd->pdu;
2965         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2966
2967         if (conn->conn_ops->HeaderDigest) {
2968                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2969
2970                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2971                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2972
2973                 iov[0].iov_len += ISCSI_CRC_LEN;
2974                 tx_size += ISCSI_CRC_LEN;
2975                 pr_debug("Attaching CRC32C HeaderDigest"
2976                         " to NopIn 0x%08x\n", *header_digest);
2977         }
2978
2979         /*
2980          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2981          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2982          */
2983         if (cmd->buf_ptr_size) {
2984                 iov[niov].iov_base      = cmd->buf_ptr;
2985                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2986                 tx_size += cmd->buf_ptr_size;
2987
2988                 pr_debug("Echoing back %u bytes of ping"
2989                         " data.\n", cmd->buf_ptr_size);
2990
2991                 padding = ((-cmd->buf_ptr_size) & 3);
2992                 if (padding != 0) {
2993                         iov[niov].iov_base = &cmd->pad_bytes;
2994                         iov[niov++].iov_len = padding;
2995                         tx_size += padding;
2996                         pr_debug("Attaching %u additional"
2997                                 " padding bytes.\n", padding);
2998                 }
2999                 if (conn->conn_ops->DataDigest) {
3000                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3001                                 cmd->buf_ptr, cmd->buf_ptr_size,
3002                                 padding, (u8 *)&cmd->pad_bytes,
3003                                 (u8 *)&cmd->data_crc);
3004
3005                         iov[niov].iov_base = &cmd->data_crc;
3006                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3007                         tx_size += ISCSI_CRC_LEN;
3008                         pr_debug("Attached DataDigest for %u"
3009                                 " bytes of ping data, CRC 0x%08x\n",
3010                                 cmd->buf_ptr_size, cmd->data_crc);
3011                 }
3012         }
3013
3014         cmd->iov_misc_count = niov;
3015         cmd->tx_size = tx_size;
3016
3017         return 0;
3018 }
3019
3020 static int iscsit_send_r2t(
3021         struct iscsi_cmd *cmd,
3022         struct iscsi_conn *conn)
3023 {
3024         int tx_size = 0;
3025         struct iscsi_r2t *r2t;
3026         struct iscsi_r2t_rsp *hdr;
3027         int ret;
3028
3029         r2t = iscsit_get_r2t_from_list(cmd);
3030         if (!r2t)
3031                 return -1;
3032
3033         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3034         memset(hdr, 0, ISCSI_HDR_LEN);
3035         hdr->opcode             = ISCSI_OP_R2T;
3036         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3037         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3038                         (struct scsi_lun *)&hdr->lun);
3039         hdr->itt                = cmd->init_task_tag;
3040         spin_lock_bh(&conn->sess->ttt_lock);
3041         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3042         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3043                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3044         spin_unlock_bh(&conn->sess->ttt_lock);
3045         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3046         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3047         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3048         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3049         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3050         hdr->data_offset        = cpu_to_be32(r2t->offset);
3051         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3052
3053         cmd->iov_misc[0].iov_base       = cmd->pdu;
3054         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3055         tx_size += ISCSI_HDR_LEN;
3056
3057         if (conn->conn_ops->HeaderDigest) {
3058                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3059
3060                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3061                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3062
3063                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3064                 tx_size += ISCSI_CRC_LEN;
3065                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3066                         " PDU 0x%08x\n", *header_digest);
3067         }
3068
3069         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3070                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3071                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3072                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3073                         r2t->offset, r2t->xfer_len, conn->cid);
3074
3075         cmd->iov_misc_count = 1;
3076         cmd->tx_size = tx_size;
3077
3078         spin_lock_bh(&cmd->r2t_lock);
3079         r2t->sent_r2t = 1;
3080         spin_unlock_bh(&cmd->r2t_lock);
3081
3082         ret = iscsit_send_tx_data(cmd, conn, 1);
3083         if (ret < 0) {
3084                 iscsit_tx_thread_wait_for_tcp(conn);
3085                 return ret;
3086         }
3087
3088         spin_lock_bh(&cmd->dataout_timeout_lock);
3089         iscsit_start_dataout_timer(cmd, conn);
3090         spin_unlock_bh(&cmd->dataout_timeout_lock);
3091
3092         return 0;
3093 }
3094
3095 /*
3096  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3097  *              connection recovery.
3098  */
3099 int iscsit_build_r2ts_for_cmd(
3100         struct iscsi_conn *conn,
3101         struct iscsi_cmd *cmd,
3102         bool recovery)
3103 {
3104         int first_r2t = 1;
3105         u32 offset = 0, xfer_len = 0;
3106
3107         spin_lock_bh(&cmd->r2t_lock);
3108         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3109                 spin_unlock_bh(&cmd->r2t_lock);
3110                 return 0;
3111         }
3112
3113         if (conn->sess->sess_ops->DataSequenceInOrder &&
3114             !recovery)
3115                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3116
3117         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3118                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3119                         offset = cmd->r2t_offset;
3120
3121                         if (first_r2t && recovery) {
3122                                 int new_data_end = offset +
3123                                         conn->sess->sess_ops->MaxBurstLength -
3124                                         cmd->next_burst_len;
3125
3126                                 if (new_data_end > cmd->se_cmd.data_length)
3127                                         xfer_len = cmd->se_cmd.data_length - offset;
3128                                 else
3129                                         xfer_len =
3130                                                 conn->sess->sess_ops->MaxBurstLength -
3131                                                 cmd->next_burst_len;
3132                         } else {
3133                                 int new_data_end = offset +
3134                                         conn->sess->sess_ops->MaxBurstLength;
3135
3136                                 if (new_data_end > cmd->se_cmd.data_length)
3137                                         xfer_len = cmd->se_cmd.data_length - offset;
3138                                 else
3139                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3140                         }
3141                         cmd->r2t_offset += xfer_len;
3142
3143                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3144                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3145                 } else {
3146                         struct iscsi_seq *seq;
3147
3148                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3149                         if (!seq) {
3150                                 spin_unlock_bh(&cmd->r2t_lock);
3151                                 return -1;
3152                         }
3153
3154                         offset = seq->offset;
3155                         xfer_len = seq->xfer_len;
3156
3157                         if (cmd->seq_send_order == cmd->seq_count)
3158                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3159                 }
3160                 cmd->outstanding_r2ts++;
3161                 first_r2t = 0;
3162
3163                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3164                         spin_unlock_bh(&cmd->r2t_lock);
3165                         return -1;
3166                 }
3167
3168                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3169                         break;
3170         }
3171         spin_unlock_bh(&cmd->r2t_lock);
3172
3173         return 0;
3174 }
3175
3176 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3177                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3178 {
3179         if (inc_stat_sn)
3180                 cmd->stat_sn = conn->stat_sn++;
3181
3182         atomic_long_inc(&conn->sess->rsp_pdus);
3183
3184         memset(hdr, 0, ISCSI_HDR_LEN);
3185         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3186         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3187         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3188                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3189                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3190         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3191                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3192                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3193         }
3194         hdr->response           = cmd->iscsi_response;
3195         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3196         hdr->itt                = cmd->init_task_tag;
3197         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3198
3199         iscsit_increment_maxcmdsn(cmd, conn->sess);
3200         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3201         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3202
3203         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3204                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3205                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3206                 cmd->se_cmd.scsi_status, conn->cid);
3207 }
3208 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3209
3210 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3211 {
3212         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3213         struct kvec *iov;
3214         u32 padding = 0, tx_size = 0;
3215         int iov_count = 0;
3216         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3217
3218         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3219
3220         iov = &cmd->iov_misc[0];
3221         iov[iov_count].iov_base = cmd->pdu;
3222         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3223         tx_size += ISCSI_HDR_LEN;
3224
3225         /*
3226          * Attach SENSE DATA payload to iSCSI Response PDU
3227          */
3228         if (cmd->se_cmd.sense_buffer &&
3229            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3230             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3231                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3232                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3233
3234                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3235                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3236                 iov[iov_count].iov_base = cmd->sense_buffer;
3237                 iov[iov_count++].iov_len =
3238                                 (cmd->se_cmd.scsi_sense_length + padding);
3239                 tx_size += cmd->se_cmd.scsi_sense_length;
3240
3241                 if (padding) {
3242                         memset(cmd->sense_buffer +
3243                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3244                         tx_size += padding;
3245                         pr_debug("Adding %u bytes of padding to"
3246                                 " SENSE.\n", padding);
3247                 }
3248
3249                 if (conn->conn_ops->DataDigest) {
3250                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3251                                 cmd->sense_buffer,
3252                                 (cmd->se_cmd.scsi_sense_length + padding),
3253                                 0, NULL, (u8 *)&cmd->data_crc);
3254
3255                         iov[iov_count].iov_base    = &cmd->data_crc;
3256                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3257                         tx_size += ISCSI_CRC_LEN;
3258
3259                         pr_debug("Attaching CRC32 DataDigest for"
3260                                 " SENSE, %u bytes CRC 0x%08x\n",
3261                                 (cmd->se_cmd.scsi_sense_length + padding),
3262                                 cmd->data_crc);
3263                 }
3264
3265                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3266                                 " Response PDU\n",
3267                                 cmd->se_cmd.scsi_sense_length);
3268         }
3269
3270         if (conn->conn_ops->HeaderDigest) {
3271                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3272
3273                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3274                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3275
3276                 iov[0].iov_len += ISCSI_CRC_LEN;
3277                 tx_size += ISCSI_CRC_LEN;
3278                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3279                                 " PDU 0x%08x\n", *header_digest);
3280         }
3281
3282         cmd->iov_misc_count = iov_count;
3283         cmd->tx_size = tx_size;
3284
3285         return 0;
3286 }
3287
3288 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3289 {
3290         switch (se_tmr->response) {
3291         case TMR_FUNCTION_COMPLETE:
3292                 return ISCSI_TMF_RSP_COMPLETE;
3293         case TMR_TASK_DOES_NOT_EXIST:
3294                 return ISCSI_TMF_RSP_NO_TASK;
3295         case TMR_LUN_DOES_NOT_EXIST:
3296                 return ISCSI_TMF_RSP_NO_LUN;
3297         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3298                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3299         case TMR_FUNCTION_REJECTED:
3300         default:
3301                 return ISCSI_TMF_RSP_REJECTED;
3302         }
3303 }
3304
3305 void
3306 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3307                           struct iscsi_tm_rsp *hdr)
3308 {
3309         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3310
3311         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3312         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3313         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3314         hdr->itt                = cmd->init_task_tag;
3315         cmd->stat_sn            = conn->stat_sn++;
3316         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3317
3318         iscsit_increment_maxcmdsn(cmd, conn->sess);
3319         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3320         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3321
3322         pr_debug("Built Task Management Response ITT: 0x%08x,"
3323                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3324                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3325 }
3326 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3327
3328 static int
3329 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3330 {
3331         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3332         u32 tx_size = 0;
3333
3334         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3335
3336         cmd->iov_misc[0].iov_base       = cmd->pdu;
3337         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3338         tx_size += ISCSI_HDR_LEN;
3339
3340         if (conn->conn_ops->HeaderDigest) {
3341                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3342
3343                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3344                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3345
3346                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3347                 tx_size += ISCSI_CRC_LEN;
3348                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3349                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3350         }
3351
3352         cmd->iov_misc_count = 1;
3353         cmd->tx_size = tx_size;
3354
3355         return 0;
3356 }
3357
3358 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3359 {
3360         bool ret = false;
3361
3362         if (np->np_sockaddr.ss_family == AF_INET6) {
3363                 const struct sockaddr_in6 sin6 = {
3364                         .sin6_addr = IN6ADDR_ANY_INIT };
3365                 struct sockaddr_in6 *sock_in6 =
3366                          (struct sockaddr_in6 *)&np->np_sockaddr;
3367
3368                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3369                                 sin6.sin6_addr.s6_addr, 16))
3370                         ret = true;
3371         } else {
3372                 struct sockaddr_in * sock_in =
3373                         (struct sockaddr_in *)&np->np_sockaddr;
3374
3375                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3376                         ret = true;
3377         }
3378
3379         return ret;
3380 }
3381
3382 #define SENDTARGETS_BUF_LIMIT 32768U
3383
3384 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3385 {
3386         char *payload = NULL;
3387         struct iscsi_conn *conn = cmd->conn;
3388         struct iscsi_portal_group *tpg;
3389         struct iscsi_tiqn *tiqn;
3390         struct iscsi_tpg_np *tpg_np;
3391         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3392         int target_name_printed;
3393         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3394         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3395
3396         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3397                          SENDTARGETS_BUF_LIMIT);
3398
3399         payload = kzalloc(buffer_len, GFP_KERNEL);
3400         if (!payload) {
3401                 pr_err("Unable to allocate memory for sendtargets"
3402                                 " response.\n");
3403                 return -ENOMEM;
3404         }
3405         /*
3406          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3407          * explicit case..
3408          */
3409         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3410                 text_ptr = strchr(text_in, '=');
3411                 if (!text_ptr) {
3412                         pr_err("Unable to locate '=' string in text_in:"
3413                                " %s\n", text_in);
3414                         kfree(payload);
3415                         return -EINVAL;
3416                 }
3417                 /*
3418                  * Skip over '=' character..
3419                  */
3420                 text_ptr += 1;
3421         }
3422
3423         spin_lock(&tiqn_lock);
3424         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3425                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3426                      strcmp(tiqn->tiqn, text_ptr)) {
3427                         continue;
3428                 }
3429
3430                 target_name_printed = 0;
3431
3432                 spin_lock(&tiqn->tiqn_tpg_lock);
3433                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3434
3435                         /* If demo_mode_discovery=0 and generate_node_acls=0
3436                          * (demo mode dislabed) do not return
3437                          * TargetName+TargetAddress unless a NodeACL exists.
3438                          */
3439
3440                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3441                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3442                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3443                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3444                                 continue;
3445                         }
3446
3447                         spin_lock(&tpg->tpg_state_lock);
3448                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3449                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3450                                 spin_unlock(&tpg->tpg_state_lock);
3451                                 continue;
3452                         }
3453                         spin_unlock(&tpg->tpg_state_lock);
3454
3455                         spin_lock(&tpg->tpg_np_lock);
3456                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3457                                                 tpg_np_list) {
3458                                 struct iscsi_np *np = tpg_np->tpg_np;
3459                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3460
3461                                 if (!target_name_printed) {
3462                                         len = sprintf(buf, "TargetName=%s",
3463                                                       tiqn->tiqn);
3464                                         len += 1;
3465
3466                                         if ((len + payload_len) > buffer_len) {
3467                                                 spin_unlock(&tpg->tpg_np_lock);
3468                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3469                                                 end_of_buf = 1;
3470                                                 goto eob;
3471                                         }
3472                                         memcpy(payload + payload_len, buf, len);
3473                                         payload_len += len;
3474                                         target_name_printed = 1;
3475                                 }
3476
3477                                 len = sprintf(buf, "TargetAddress="
3478                                         "%s:%hu,%hu",
3479                                         (inaddr_any == false) ?
3480                                                 np->np_ip : conn->local_ip,
3481                                         (inaddr_any == false) ?
3482                                                 np->np_port : conn->local_port,
3483                                         tpg->tpgt);
3484                                 len += 1;
3485
3486                                 if ((len + payload_len) > buffer_len) {
3487                                         spin_unlock(&tpg->tpg_np_lock);
3488                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3489                                         end_of_buf = 1;
3490                                         goto eob;
3491                                 }
3492                                 memcpy(payload + payload_len, buf, len);
3493                                 payload_len += len;
3494                         }
3495                         spin_unlock(&tpg->tpg_np_lock);
3496                 }
3497                 spin_unlock(&tiqn->tiqn_tpg_lock);
3498 eob:
3499                 if (end_of_buf)
3500                         break;
3501
3502                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3503                         break;
3504         }
3505         spin_unlock(&tiqn_lock);
3506
3507         cmd->buf_ptr = payload;
3508
3509         return payload_len;
3510 }
3511
3512 int
3513 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3514                       struct iscsi_text_rsp *hdr)
3515 {
3516         int text_length, padding;
3517
3518         text_length = iscsit_build_sendtargets_response(cmd);
3519         if (text_length < 0)
3520                 return text_length;
3521
3522         hdr->opcode = ISCSI_OP_TEXT_RSP;
3523         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3524         padding = ((-text_length) & 3);
3525         hton24(hdr->dlength, text_length);
3526         hdr->itt = cmd->init_task_tag;
3527         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3528         cmd->stat_sn = conn->stat_sn++;
3529         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3530
3531         iscsit_increment_maxcmdsn(cmd, conn->sess);
3532         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3533         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3534
3535         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3536                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3537                 text_length, conn->cid);
3538
3539         return text_length + padding;
3540 }
3541 EXPORT_SYMBOL(iscsit_build_text_rsp);
3542
3543 /*
3544  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3545  *      MaxRecvDataSegmentLength.
3546  */
3547 static int iscsit_send_text_rsp(
3548         struct iscsi_cmd *cmd,
3549         struct iscsi_conn *conn)
3550 {
3551         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3552         struct kvec *iov;
3553         u32 tx_size = 0;
3554         int text_length, iov_count = 0, rc;
3555
3556         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3557         if (rc < 0)
3558                 return rc;
3559
3560         text_length = rc;
3561         iov = &cmd->iov_misc[0];
3562         iov[iov_count].iov_base = cmd->pdu;
3563         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3564         iov[iov_count].iov_base = cmd->buf_ptr;
3565         iov[iov_count++].iov_len = text_length;
3566
3567         tx_size += (ISCSI_HDR_LEN + text_length);
3568
3569         if (conn->conn_ops->HeaderDigest) {
3570                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3571
3572                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3573                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3574
3575                 iov[0].iov_len += ISCSI_CRC_LEN;
3576                 tx_size += ISCSI_CRC_LEN;
3577                 pr_debug("Attaching CRC32 HeaderDigest for"
3578                         " Text Response PDU 0x%08x\n", *header_digest);
3579         }
3580
3581         if (conn->conn_ops->DataDigest) {
3582                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3583                                 cmd->buf_ptr, text_length,
3584                                 0, NULL, (u8 *)&cmd->data_crc);
3585
3586                 iov[iov_count].iov_base = &cmd->data_crc;
3587                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3588                 tx_size += ISCSI_CRC_LEN;
3589
3590                 pr_debug("Attaching DataDigest for %u bytes of text"
3591                         " data, CRC 0x%08x\n", text_length,
3592                         cmd->data_crc);
3593         }
3594
3595         cmd->iov_misc_count = iov_count;
3596         cmd->tx_size = tx_size;
3597
3598         return 0;
3599 }
3600
3601 void
3602 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3603                     struct iscsi_reject *hdr)
3604 {
3605         hdr->opcode             = ISCSI_OP_REJECT;
3606         hdr->reason             = cmd->reject_reason;
3607         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3608         hton24(hdr->dlength, ISCSI_HDR_LEN);
3609         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3610         cmd->stat_sn            = conn->stat_sn++;
3611         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3612         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3613         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3614
3615 }
3616 EXPORT_SYMBOL(iscsit_build_reject);
3617
3618 static int iscsit_send_reject(
3619         struct iscsi_cmd *cmd,
3620         struct iscsi_conn *conn)
3621 {
3622         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3623         struct kvec *iov;
3624         u32 iov_count = 0, tx_size;
3625
3626         iscsit_build_reject(cmd, conn, hdr);
3627
3628         iov = &cmd->iov_misc[0];
3629         iov[iov_count].iov_base = cmd->pdu;
3630         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3631         iov[iov_count].iov_base = cmd->buf_ptr;
3632         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3633
3634         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3635
3636         if (conn->conn_ops->HeaderDigest) {
3637                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3638
3639                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3640                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3641
3642                 iov[0].iov_len += ISCSI_CRC_LEN;
3643                 tx_size += ISCSI_CRC_LEN;
3644                 pr_debug("Attaching CRC32 HeaderDigest for"
3645                         " REJECT PDU 0x%08x\n", *header_digest);
3646         }
3647
3648         if (conn->conn_ops->DataDigest) {
3649                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3650                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3651
3652                 iov[iov_count].iov_base = &cmd->data_crc;
3653                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3654                 tx_size += ISCSI_CRC_LEN;
3655                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3656                                 " PDU 0x%08x\n", cmd->data_crc);
3657         }
3658
3659         cmd->iov_misc_count = iov_count;
3660         cmd->tx_size = tx_size;
3661
3662         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3663                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3664
3665         return 0;
3666 }
3667
3668 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3669 {
3670         struct iscsi_thread_set *ts = conn->thread_set;
3671         int ord, cpu;
3672         /*
3673          * thread_id is assigned from iscsit_global->ts_bitmap from
3674          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3675          *
3676          * Here we use thread_id to determine which CPU that this
3677          * iSCSI connection's iscsi_thread_set will be scheduled to
3678          * execute upon.
3679          */
3680         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3681         for_each_online_cpu(cpu) {
3682                 if (ord-- == 0) {
3683                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3684                         return;
3685                 }
3686         }
3687         /*
3688          * This should never be reached..
3689          */
3690         dump_stack();
3691         cpumask_setall(conn->conn_cpumask);
3692 }
3693
3694 static inline void iscsit_thread_check_cpumask(
3695         struct iscsi_conn *conn,
3696         struct task_struct *p,
3697         int mode)
3698 {
3699         char buf[128];
3700         /*
3701          * mode == 1 signals iscsi_target_tx_thread() usage.
3702          * mode == 0 signals iscsi_target_rx_thread() usage.
3703          */
3704         if (mode == 1) {
3705                 if (!conn->conn_tx_reset_cpumask)
3706                         return;
3707                 conn->conn_tx_reset_cpumask = 0;
3708         } else {
3709                 if (!conn->conn_rx_reset_cpumask)
3710                         return;
3711                 conn->conn_rx_reset_cpumask = 0;
3712         }
3713         /*
3714          * Update the CPU mask for this single kthread so that
3715          * both TX and RX kthreads are scheduled to run on the
3716          * same CPU.
3717          */
3718         memset(buf, 0, 128);
3719         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3720         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3721 }
3722
3723 static int
3724 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3725 {
3726         int ret;
3727
3728         switch (state) {
3729         case ISTATE_SEND_R2T:
3730                 ret = iscsit_send_r2t(cmd, conn);
3731                 if (ret < 0)
3732                         goto err;
3733                 break;
3734         case ISTATE_REMOVE:
3735                 spin_lock_bh(&conn->cmd_lock);
3736                 list_del_init(&cmd->i_conn_node);
3737                 spin_unlock_bh(&conn->cmd_lock);
3738
3739                 iscsit_free_cmd(cmd, false);
3740                 break;
3741         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3742                 iscsit_mod_nopin_response_timer(conn);
3743                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3744                 if (ret < 0)
3745                         goto err;
3746                 break;
3747         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3748                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3749                 if (ret < 0)
3750                         goto err;
3751                 break;
3752         default:
3753                 pr_err("Unknown Opcode: 0x%02x ITT:"
3754                        " 0x%08x, i_state: %d on CID: %hu\n",
3755                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3756                        conn->cid);
3757                 goto err;
3758         }
3759
3760         return 0;
3761
3762 err:
3763         return -1;
3764 }
3765
3766 static int
3767 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3768 {
3769         struct iscsit_transport *t = conn->conn_transport;
3770         struct iscsi_queue_req *qr;
3771         struct iscsi_cmd *cmd;
3772         u8 state;
3773         int ret;
3774
3775         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3776                 atomic_set(&conn->check_immediate_queue, 0);
3777                 cmd = qr->cmd;
3778                 state = qr->state;
3779                 kmem_cache_free(lio_qr_cache, qr);
3780
3781                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3782                 if (ret < 0)
3783                         return ret;
3784         }
3785
3786         return 0;
3787 }
3788
3789 static int
3790 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3791 {
3792         int ret;
3793
3794 check_rsp_state:
3795         switch (state) {
3796         case ISTATE_SEND_DATAIN:
3797                 ret = iscsit_send_datain(cmd, conn);
3798                 if (ret < 0)
3799                         goto err;
3800                 else if (!ret)
3801                         /* more drs */
3802                         goto check_rsp_state;
3803                 else if (ret == 1) {
3804                         /* all done */
3805                         spin_lock_bh(&cmd->istate_lock);
3806                         cmd->i_state = ISTATE_SENT_STATUS;
3807                         spin_unlock_bh(&cmd->istate_lock);
3808
3809                         if (atomic_read(&conn->check_immediate_queue))
3810                                 return 1;
3811
3812                         return 0;
3813                 } else if (ret == 2) {
3814                         /* Still must send status,
3815                            SCF_TRANSPORT_TASK_SENSE was set */
3816                         spin_lock_bh(&cmd->istate_lock);
3817                         cmd->i_state = ISTATE_SEND_STATUS;
3818                         spin_unlock_bh(&cmd->istate_lock);
3819                         state = ISTATE_SEND_STATUS;
3820                         goto check_rsp_state;
3821                 }
3822
3823                 break;
3824         case ISTATE_SEND_STATUS:
3825         case ISTATE_SEND_STATUS_RECOVERY:
3826                 ret = iscsit_send_response(cmd, conn);
3827                 break;
3828         case ISTATE_SEND_LOGOUTRSP:
3829                 ret = iscsit_send_logout(cmd, conn);
3830                 break;
3831         case ISTATE_SEND_ASYNCMSG:
3832                 ret = iscsit_send_conn_drop_async_message(
3833                         cmd, conn);
3834                 break;
3835         case ISTATE_SEND_NOPIN:
3836                 ret = iscsit_send_nopin(cmd, conn);
3837                 break;
3838         case ISTATE_SEND_REJECT:
3839                 ret = iscsit_send_reject(cmd, conn);
3840                 break;
3841         case ISTATE_SEND_TASKMGTRSP:
3842                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3843                 if (ret != 0)
3844                         break;
3845                 ret = iscsit_tmr_post_handler(cmd, conn);
3846                 if (ret != 0)
3847                         iscsit_fall_back_to_erl0(conn->sess);
3848                 break;
3849         case ISTATE_SEND_TEXTRSP:
3850                 ret = iscsit_send_text_rsp(cmd, conn);
3851                 break;
3852         default:
3853                 pr_err("Unknown Opcode: 0x%02x ITT:"
3854                        " 0x%08x, i_state: %d on CID: %hu\n",
3855                        cmd->iscsi_opcode, cmd->init_task_tag,
3856                        state, conn->cid);
3857                 goto err;
3858         }
3859         if (ret < 0)
3860                 goto err;
3861
3862         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3863                 iscsit_tx_thread_wait_for_tcp(conn);
3864                 iscsit_unmap_iovec(cmd);
3865                 goto err;
3866         }
3867         iscsit_unmap_iovec(cmd);
3868
3869         switch (state) {
3870         case ISTATE_SEND_LOGOUTRSP:
3871                 if (!iscsit_logout_post_handler(cmd, conn))
3872                         goto restart;
3873                 /* fall through */
3874         case ISTATE_SEND_STATUS:
3875         case ISTATE_SEND_ASYNCMSG:
3876         case ISTATE_SEND_NOPIN:
3877         case ISTATE_SEND_STATUS_RECOVERY:
3878         case ISTATE_SEND_TEXTRSP:
3879         case ISTATE_SEND_TASKMGTRSP:
3880         case ISTATE_SEND_REJECT:
3881                 spin_lock_bh(&cmd->istate_lock);
3882                 cmd->i_state = ISTATE_SENT_STATUS;
3883                 spin_unlock_bh(&cmd->istate_lock);
3884                 break;
3885         default:
3886                 pr_err("Unknown Opcode: 0x%02x ITT:"
3887                        " 0x%08x, i_state: %d on CID: %hu\n",
3888                        cmd->iscsi_opcode, cmd->init_task_tag,
3889                        cmd->i_state, conn->cid);
3890                 goto err;
3891         }
3892
3893         if (atomic_read(&conn->check_immediate_queue))
3894                 return 1;
3895
3896         return 0;
3897
3898 err:
3899         return -1;
3900 restart:
3901         return -EAGAIN;
3902 }
3903
3904 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3905 {
3906         struct iscsit_transport *t = conn->conn_transport;
3907         struct iscsi_queue_req *qr;
3908         struct iscsi_cmd *cmd;
3909         u8 state;
3910         int ret;
3911
3912         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3913                 cmd = qr->cmd;
3914                 state = qr->state;
3915                 kmem_cache_free(lio_qr_cache, qr);
3916
3917                 ret = t->iscsit_response_queue(conn, cmd, state);
3918                 if (ret == 1 || ret < 0)
3919                         return ret;
3920         }
3921
3922         return 0;
3923 }
3924
3925 int iscsi_target_tx_thread(void *arg)
3926 {
3927         int ret = 0;
3928         struct iscsi_conn *conn;
3929         struct iscsi_thread_set *ts = arg;
3930         /*
3931          * Allow ourselves to be interrupted by SIGINT so that a
3932          * connection recovery / failure event can be triggered externally.
3933          */
3934         allow_signal(SIGINT);
3935
3936 restart:
3937         conn = iscsi_tx_thread_pre_handler(ts);
3938         if (!conn)
3939                 goto out;
3940
3941         ret = 0;
3942
3943         while (!kthread_should_stop()) {
3944                 /*
3945                  * Ensure that both TX and RX per connection kthreads
3946                  * are scheduled to run on the same CPU.
3947                  */
3948                 iscsit_thread_check_cpumask(conn, current, 1);
3949
3950                 wait_event_interruptible(conn->queues_wq,
3951                                          !iscsit_conn_all_queues_empty(conn) ||
3952                                          ts->status == ISCSI_THREAD_SET_RESET);
3953
3954                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3955                      signal_pending(current))
3956                         goto transport_err;
3957
3958 get_immediate:
3959                 ret = iscsit_handle_immediate_queue(conn);
3960                 if (ret < 0)
3961                         goto transport_err;
3962
3963                 ret = iscsit_handle_response_queue(conn);
3964                 if (ret == 1)
3965                         goto get_immediate;
3966                 else if (ret == -EAGAIN)
3967                         goto restart;
3968                 else if (ret < 0)
3969                         goto transport_err;
3970         }
3971
3972 transport_err:
3973         iscsit_take_action_for_connection_exit(conn);
3974         goto restart;
3975 out:
3976         return 0;
3977 }
3978
3979 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3980 {
3981         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3982         struct iscsi_cmd *cmd;
3983         int ret = 0;
3984
3985         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3986         case ISCSI_OP_SCSI_CMD:
3987                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3988                 if (!cmd)
3989                         goto reject;
3990
3991                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3992                 break;
3993         case ISCSI_OP_SCSI_DATA_OUT:
3994                 ret = iscsit_handle_data_out(conn, buf);
3995                 break;
3996         case ISCSI_OP_NOOP_OUT:
3997                 cmd = NULL;
3998                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3999                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4000                         if (!cmd)
4001                                 goto reject;
4002                 }
4003                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4004                 break;
4005         case ISCSI_OP_SCSI_TMFUNC:
4006                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4007                 if (!cmd)
4008                         goto reject;
4009
4010                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4011                 break;
4012         case ISCSI_OP_TEXT:
4013                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4014                 if (!cmd)
4015                         goto reject;
4016
4017                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4018                 break;
4019         case ISCSI_OP_LOGOUT:
4020                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4021                 if (!cmd)
4022                         goto reject;
4023
4024                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4025                 if (ret > 0)
4026                         wait_for_completion_timeout(&conn->conn_logout_comp,
4027                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4028                 break;
4029         case ISCSI_OP_SNACK:
4030                 ret = iscsit_handle_snack(conn, buf);
4031                 break;
4032         default:
4033                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4034                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4035                         pr_err("Cannot recover from unknown"
4036                         " opcode while ERL=0, closing iSCSI connection.\n");
4037                         return -1;
4038                 }
4039                 if (!conn->conn_ops->OFMarker) {
4040                         pr_err("Unable to recover from unknown"
4041                         " opcode while OFMarker=No, closing iSCSI"
4042                                 " connection.\n");
4043                         return -1;
4044                 }
4045                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4046                         pr_err("Unable to recover from unknown"
4047                                 " opcode, closing iSCSI connection.\n");
4048                         return -1;
4049                 }
4050                 break;
4051         }
4052
4053         return ret;
4054 reject:
4055         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4056 }
4057
4058 int iscsi_target_rx_thread(void *arg)
4059 {
4060         int ret;
4061         u8 buffer[ISCSI_HDR_LEN], opcode;
4062         u32 checksum = 0, digest = 0;
4063         struct iscsi_conn *conn = NULL;
4064         struct iscsi_thread_set *ts = arg;
4065         struct kvec iov;
4066         /*
4067          * Allow ourselves to be interrupted by SIGINT so that a
4068          * connection recovery / failure event can be triggered externally.
4069          */
4070         allow_signal(SIGINT);
4071
4072 restart:
4073         conn = iscsi_rx_thread_pre_handler(ts);
4074         if (!conn)
4075                 goto out;
4076
4077         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4078                 struct completion comp;
4079                 int rc;
4080
4081                 init_completion(&comp);
4082                 rc = wait_for_completion_interruptible(&comp);
4083                 if (rc < 0)
4084                         goto transport_err;
4085
4086                 goto out;
4087         }
4088
4089         while (!kthread_should_stop()) {
4090                 /*
4091                  * Ensure that both TX and RX per connection kthreads
4092                  * are scheduled to run on the same CPU.
4093                  */
4094                 iscsit_thread_check_cpumask(conn, current, 0);
4095
4096                 memset(buffer, 0, ISCSI_HDR_LEN);
4097                 memset(&iov, 0, sizeof(struct kvec));
4098
4099                 iov.iov_base    = buffer;
4100                 iov.iov_len     = ISCSI_HDR_LEN;
4101
4102                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4103                 if (ret != ISCSI_HDR_LEN) {
4104                         iscsit_rx_thread_wait_for_tcp(conn);
4105                         goto transport_err;
4106                 }
4107
4108                 if (conn->conn_ops->HeaderDigest) {
4109                         iov.iov_base    = &digest;
4110                         iov.iov_len     = ISCSI_CRC_LEN;
4111
4112                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4113                         if (ret != ISCSI_CRC_LEN) {
4114                                 iscsit_rx_thread_wait_for_tcp(conn);
4115                                 goto transport_err;
4116                         }
4117
4118                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4119                                         buffer, ISCSI_HDR_LEN,
4120                                         0, NULL, (u8 *)&checksum);
4121
4122                         if (digest != checksum) {
4123                                 pr_err("HeaderDigest CRC32C failed,"
4124                                         " received 0x%08x, computed 0x%08x\n",
4125                                         digest, checksum);
4126                                 /*
4127                                  * Set the PDU to 0xff so it will intentionally
4128                                  * hit default in the switch below.
4129                                  */
4130                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4131                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4132                         } else {
4133                                 pr_debug("Got HeaderDigest CRC32C"
4134                                                 " 0x%08x\n", checksum);
4135                         }
4136                 }
4137
4138                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4139                         goto transport_err;
4140
4141                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4142
4143                 if (conn->sess->sess_ops->SessionType &&
4144                    ((!(opcode & ISCSI_OP_TEXT)) ||
4145                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4146                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4147                         " while in Discovery Session, rejecting.\n", opcode);
4148                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4149                                           buffer);
4150                         goto transport_err;
4151                 }
4152
4153                 ret = iscsi_target_rx_opcode(conn, buffer);
4154                 if (ret < 0)
4155                         goto transport_err;
4156         }
4157
4158 transport_err:
4159         if (!signal_pending(current))
4160                 atomic_set(&conn->transport_failed, 1);
4161         iscsit_take_action_for_connection_exit(conn);
4162         goto restart;
4163 out:
4164         return 0;
4165 }
4166
4167 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4168 {
4169         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4170         struct iscsi_session *sess = conn->sess;
4171         /*
4172          * We expect this function to only ever be called from either RX or TX
4173          * thread context via iscsit_close_connection() once the other context
4174          * has been reset -> returned sleeping pre-handler state.
4175          */
4176         spin_lock_bh(&conn->cmd_lock);
4177         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4178
4179                 list_del_init(&cmd->i_conn_node);
4180                 spin_unlock_bh(&conn->cmd_lock);
4181
4182                 iscsit_increment_maxcmdsn(cmd, sess);
4183
4184                 iscsit_free_cmd(cmd, true);
4185
4186                 spin_lock_bh(&conn->cmd_lock);
4187         }
4188         spin_unlock_bh(&conn->cmd_lock);
4189 }
4190
4191 static void iscsit_stop_timers_for_cmds(
4192         struct iscsi_conn *conn)
4193 {
4194         struct iscsi_cmd *cmd;
4195
4196         spin_lock_bh(&conn->cmd_lock);
4197         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4198                 if (cmd->data_direction == DMA_TO_DEVICE)
4199                         iscsit_stop_dataout_timer(cmd);
4200         }
4201         spin_unlock_bh(&conn->cmd_lock);
4202 }
4203
4204 int iscsit_close_connection(
4205         struct iscsi_conn *conn)
4206 {
4207         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4208         struct iscsi_session    *sess = conn->sess;
4209
4210         pr_debug("Closing iSCSI connection CID %hu on SID:"
4211                 " %u\n", conn->cid, sess->sid);
4212         /*
4213          * Always up conn_logout_comp just in case the RX Thread is sleeping
4214          * and the logout response never got sent because the connection
4215          * failed.
4216          */
4217         complete(&conn->conn_logout_comp);
4218
4219         iscsi_release_thread_set(conn);
4220
4221         iscsit_stop_timers_for_cmds(conn);
4222         iscsit_stop_nopin_response_timer(conn);
4223         iscsit_stop_nopin_timer(conn);
4224
4225         if (conn->conn_transport->iscsit_wait_conn)
4226                 conn->conn_transport->iscsit_wait_conn(conn);
4227
4228         iscsit_free_queue_reqs_for_conn(conn);
4229
4230         /*
4231          * During Connection recovery drop unacknowledged out of order
4232          * commands for this connection, and prepare the other commands
4233          * for realligence.
4234          *
4235          * During normal operation clear the out of order commands (but
4236          * do not free the struct iscsi_ooo_cmdsn's) and release all
4237          * struct iscsi_cmds.
4238          */
4239         if (atomic_read(&conn->connection_recovery)) {
4240                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4241                 iscsit_prepare_cmds_for_realligance(conn);
4242         } else {
4243                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4244                 iscsit_release_commands_from_conn(conn);
4245         }
4246
4247         /*
4248          * Handle decrementing session or connection usage count if
4249          * a logout response was not able to be sent because the
4250          * connection failed.  Fall back to Session Recovery here.
4251          */
4252         if (atomic_read(&conn->conn_logout_remove)) {
4253                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4254                         iscsit_dec_conn_usage_count(conn);
4255                         iscsit_dec_session_usage_count(sess);
4256                 }
4257                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4258                         iscsit_dec_conn_usage_count(conn);
4259
4260                 atomic_set(&conn->conn_logout_remove, 0);
4261                 atomic_set(&sess->session_reinstatement, 0);
4262                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4263         }
4264
4265         spin_lock_bh(&sess->conn_lock);
4266         list_del(&conn->conn_list);
4267
4268         /*
4269          * Attempt to let the Initiator know this connection failed by
4270          * sending an Connection Dropped Async Message on another
4271          * active connection.
4272          */
4273         if (atomic_read(&conn->connection_recovery))
4274                 iscsit_build_conn_drop_async_message(conn);
4275
4276         spin_unlock_bh(&sess->conn_lock);
4277
4278         /*
4279          * If connection reinstatement is being performed on this connection,
4280          * up the connection reinstatement semaphore that is being blocked on
4281          * in iscsit_cause_connection_reinstatement().
4282          */
4283         spin_lock_bh(&conn->state_lock);
4284         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4285                 spin_unlock_bh(&conn->state_lock);
4286                 complete(&conn->conn_wait_comp);
4287                 wait_for_completion(&conn->conn_post_wait_comp);
4288                 spin_lock_bh(&conn->state_lock);
4289         }
4290
4291         /*
4292          * If connection reinstatement is being performed on this connection
4293          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4294          * connection wait rcfr semaphore that is being blocked on
4295          * an iscsit_connection_reinstatement_rcfr().
4296          */
4297         if (atomic_read(&conn->connection_wait_rcfr)) {
4298                 spin_unlock_bh(&conn->state_lock);
4299                 complete(&conn->conn_wait_rcfr_comp);
4300                 wait_for_completion(&conn->conn_post_wait_comp);
4301                 spin_lock_bh(&conn->state_lock);
4302         }
4303         atomic_set(&conn->connection_reinstatement, 1);
4304         spin_unlock_bh(&conn->state_lock);
4305
4306         /*
4307          * If any other processes are accessing this connection pointer we
4308          * must wait until they have completed.
4309          */
4310         iscsit_check_conn_usage_count(conn);
4311
4312         if (conn->conn_rx_hash.tfm)
4313                 crypto_free_hash(conn->conn_rx_hash.tfm);
4314         if (conn->conn_tx_hash.tfm)
4315                 crypto_free_hash(conn->conn_tx_hash.tfm);
4316
4317         if (conn->conn_cpumask)
4318                 free_cpumask_var(conn->conn_cpumask);
4319
4320         kfree(conn->conn_ops);
4321         conn->conn_ops = NULL;
4322
4323         if (conn->sock)
4324                 sock_release(conn->sock);
4325
4326         if (conn->conn_transport->iscsit_free_conn)
4327                 conn->conn_transport->iscsit_free_conn(conn);
4328
4329         iscsit_put_transport(conn->conn_transport);
4330
4331         conn->thread_set = NULL;
4332
4333         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4334         conn->conn_state = TARG_CONN_STATE_FREE;
4335         kfree(conn);
4336
4337         spin_lock_bh(&sess->conn_lock);
4338         atomic_dec(&sess->nconn);
4339         pr_debug("Decremented iSCSI connection count to %hu from node:"
4340                 " %s\n", atomic_read(&sess->nconn),
4341                 sess->sess_ops->InitiatorName);
4342         /*
4343          * Make sure that if one connection fails in an non ERL=2 iSCSI
4344          * Session that they all fail.
4345          */
4346         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4347              !atomic_read(&sess->session_logout))
4348                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4349
4350         /*
4351          * If this was not the last connection in the session, and we are
4352          * performing session reinstatement or falling back to ERL=0, call
4353          * iscsit_stop_session() without sleeping to shutdown the other
4354          * active connections.
4355          */
4356         if (atomic_read(&sess->nconn)) {
4357                 if (!atomic_read(&sess->session_reinstatement) &&
4358                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4359                         spin_unlock_bh(&sess->conn_lock);
4360                         return 0;
4361                 }
4362                 if (!atomic_read(&sess->session_stop_active)) {
4363                         atomic_set(&sess->session_stop_active, 1);
4364                         spin_unlock_bh(&sess->conn_lock);
4365                         iscsit_stop_session(sess, 0, 0);
4366                         return 0;
4367                 }
4368                 spin_unlock_bh(&sess->conn_lock);
4369                 return 0;
4370         }
4371
4372         /*
4373          * If this was the last connection in the session and one of the
4374          * following is occurring:
4375          *
4376          * Session Reinstatement is not being performed, and are falling back
4377          * to ERL=0 call iscsit_close_session().
4378          *
4379          * Session Logout was requested.  iscsit_close_session() will be called
4380          * elsewhere.
4381          *
4382          * Session Continuation is not being performed, start the Time2Retain
4383          * handler and check if sleep_on_sess_wait_sem is active.
4384          */
4385         if (!atomic_read(&sess->session_reinstatement) &&
4386              atomic_read(&sess->session_fall_back_to_erl0)) {
4387                 spin_unlock_bh(&sess->conn_lock);
4388                 target_put_session(sess->se_sess);
4389
4390                 return 0;
4391         } else if (atomic_read(&sess->session_logout)) {
4392                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4393                 sess->session_state = TARG_SESS_STATE_FREE;
4394                 spin_unlock_bh(&sess->conn_lock);
4395
4396                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4397                         complete(&sess->session_wait_comp);
4398
4399                 return 0;
4400         } else {
4401                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4402                 sess->session_state = TARG_SESS_STATE_FAILED;
4403
4404                 if (!atomic_read(&sess->session_continuation)) {
4405                         spin_unlock_bh(&sess->conn_lock);
4406                         iscsit_start_time2retain_handler(sess);
4407                 } else
4408                         spin_unlock_bh(&sess->conn_lock);
4409
4410                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4411                         complete(&sess->session_wait_comp);
4412
4413                 return 0;
4414         }
4415         spin_unlock_bh(&sess->conn_lock);
4416
4417         return 0;
4418 }
4419
4420 int iscsit_close_session(struct iscsi_session *sess)
4421 {
4422         struct iscsi_portal_group *tpg = sess->tpg;
4423         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4424
4425         if (atomic_read(&sess->nconn)) {
4426                 pr_err("%d connection(s) still exist for iSCSI session"
4427                         " to %s\n", atomic_read(&sess->nconn),
4428                         sess->sess_ops->InitiatorName);
4429                 BUG();
4430         }
4431
4432         spin_lock_bh(&se_tpg->session_lock);
4433         atomic_set(&sess->session_logout, 1);
4434         atomic_set(&sess->session_reinstatement, 1);
4435         iscsit_stop_time2retain_timer(sess);
4436         spin_unlock_bh(&se_tpg->session_lock);
4437
4438         /*
4439          * transport_deregister_session_configfs() will clear the
4440          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4441          * can be setting it again with __transport_register_session() in
4442          * iscsi_post_login_handler() again after the iscsit_stop_session()
4443          * completes in iscsi_np context.
4444          */
4445         transport_deregister_session_configfs(sess->se_sess);
4446
4447         /*
4448          * If any other processes are accessing this session pointer we must
4449          * wait until they have completed.  If we are in an interrupt (the
4450          * time2retain handler) and contain and active session usage count we
4451          * restart the timer and exit.
4452          */
4453         if (!in_interrupt()) {
4454                 if (iscsit_check_session_usage_count(sess) == 1)
4455                         iscsit_stop_session(sess, 1, 1);
4456         } else {
4457                 if (iscsit_check_session_usage_count(sess) == 2) {
4458                         atomic_set(&sess->session_logout, 0);
4459                         iscsit_start_time2retain_handler(sess);
4460                         return 0;
4461                 }
4462         }
4463
4464         transport_deregister_session(sess->se_sess);
4465
4466         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4467                 iscsit_free_connection_recovery_entires(sess);
4468
4469         iscsit_free_all_ooo_cmdsns(sess);
4470
4471         spin_lock_bh(&se_tpg->session_lock);
4472         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4473         sess->session_state = TARG_SESS_STATE_FREE;
4474         pr_debug("Released iSCSI session from node: %s\n",
4475                         sess->sess_ops->InitiatorName);
4476         tpg->nsessions--;
4477         if (tpg->tpg_tiqn)
4478                 tpg->tpg_tiqn->tiqn_nsessions--;
4479
4480         pr_debug("Decremented number of active iSCSI Sessions on"
4481                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4482
4483         spin_lock(&sess_idr_lock);
4484         idr_remove(&sess_idr, sess->session_index);
4485         spin_unlock(&sess_idr_lock);
4486
4487         kfree(sess->sess_ops);
4488         sess->sess_ops = NULL;
4489         spin_unlock_bh(&se_tpg->session_lock);
4490
4491         kfree(sess);
4492         return 0;
4493 }
4494
4495 static void iscsit_logout_post_handler_closesession(
4496         struct iscsi_conn *conn)
4497 {
4498         struct iscsi_session *sess = conn->sess;
4499
4500         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4501         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4502
4503         atomic_set(&conn->conn_logout_remove, 0);
4504         complete(&conn->conn_logout_comp);
4505
4506         iscsit_dec_conn_usage_count(conn);
4507         iscsit_stop_session(sess, 1, 1);
4508         iscsit_dec_session_usage_count(sess);
4509         target_put_session(sess->se_sess);
4510 }
4511
4512 static void iscsit_logout_post_handler_samecid(
4513         struct iscsi_conn *conn)
4514 {
4515         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4516         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4517
4518         atomic_set(&conn->conn_logout_remove, 0);
4519         complete(&conn->conn_logout_comp);
4520
4521         iscsit_cause_connection_reinstatement(conn, 1);
4522         iscsit_dec_conn_usage_count(conn);
4523 }
4524
4525 static void iscsit_logout_post_handler_diffcid(
4526         struct iscsi_conn *conn,
4527         u16 cid)
4528 {
4529         struct iscsi_conn *l_conn;
4530         struct iscsi_session *sess = conn->sess;
4531
4532         if (!sess)
4533                 return;
4534
4535         spin_lock_bh(&sess->conn_lock);
4536         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4537                 if (l_conn->cid == cid) {
4538                         iscsit_inc_conn_usage_count(l_conn);
4539                         break;
4540                 }
4541         }
4542         spin_unlock_bh(&sess->conn_lock);
4543
4544         if (!l_conn)
4545                 return;
4546
4547         if (l_conn->sock)
4548                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4549
4550         spin_lock_bh(&l_conn->state_lock);
4551         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4552         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4553         spin_unlock_bh(&l_conn->state_lock);
4554
4555         iscsit_cause_connection_reinstatement(l_conn, 1);
4556         iscsit_dec_conn_usage_count(l_conn);
4557 }
4558
4559 /*
4560  *      Return of 0 causes the TX thread to restart.
4561  */
4562 int iscsit_logout_post_handler(
4563         struct iscsi_cmd *cmd,
4564         struct iscsi_conn *conn)
4565 {
4566         int ret = 0;
4567
4568         switch (cmd->logout_reason) {
4569         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4570                 switch (cmd->logout_response) {
4571                 case ISCSI_LOGOUT_SUCCESS:
4572                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4573                 default:
4574                         iscsit_logout_post_handler_closesession(conn);
4575                         break;
4576                 }
4577                 ret = 0;
4578                 break;
4579         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4580                 if (conn->cid == cmd->logout_cid) {
4581                         switch (cmd->logout_response) {
4582                         case ISCSI_LOGOUT_SUCCESS:
4583                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4584                         default:
4585                                 iscsit_logout_post_handler_samecid(conn);
4586                                 break;
4587                         }
4588                         ret = 0;
4589                 } else {
4590                         switch (cmd->logout_response) {
4591                         case ISCSI_LOGOUT_SUCCESS:
4592                                 iscsit_logout_post_handler_diffcid(conn,
4593                                         cmd->logout_cid);
4594                                 break;
4595                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4596                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4597                         default:
4598                                 break;
4599                         }
4600                         ret = 1;
4601                 }
4602                 break;
4603         case ISCSI_LOGOUT_REASON_RECOVERY:
4604                 switch (cmd->logout_response) {
4605                 case ISCSI_LOGOUT_SUCCESS:
4606                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4607                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4608                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4609                 default:
4610                         break;
4611                 }
4612                 ret = 1;
4613                 break;
4614         default:
4615                 break;
4616
4617         }
4618         return ret;
4619 }
4620 EXPORT_SYMBOL(iscsit_logout_post_handler);
4621
4622 void iscsit_fail_session(struct iscsi_session *sess)
4623 {
4624         struct iscsi_conn *conn;
4625
4626         spin_lock_bh(&sess->conn_lock);
4627         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4628                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4629                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4630         }
4631         spin_unlock_bh(&sess->conn_lock);
4632
4633         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4634         sess->session_state = TARG_SESS_STATE_FAILED;
4635 }
4636
4637 int iscsit_free_session(struct iscsi_session *sess)
4638 {
4639         u16 conn_count = atomic_read(&sess->nconn);
4640         struct iscsi_conn *conn, *conn_tmp = NULL;
4641         int is_last;
4642
4643         spin_lock_bh(&sess->conn_lock);
4644         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4645
4646         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4647                         conn_list) {
4648                 if (conn_count == 0)
4649                         break;
4650
4651                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4652                         is_last = 1;
4653                 } else {
4654                         iscsit_inc_conn_usage_count(conn_tmp);
4655                         is_last = 0;
4656                 }
4657                 iscsit_inc_conn_usage_count(conn);
4658
4659                 spin_unlock_bh(&sess->conn_lock);
4660                 iscsit_cause_connection_reinstatement(conn, 1);
4661                 spin_lock_bh(&sess->conn_lock);
4662
4663                 iscsit_dec_conn_usage_count(conn);
4664                 if (is_last == 0)
4665                         iscsit_dec_conn_usage_count(conn_tmp);
4666
4667                 conn_count--;
4668         }
4669
4670         if (atomic_read(&sess->nconn)) {
4671                 spin_unlock_bh(&sess->conn_lock);
4672                 wait_for_completion(&sess->session_wait_comp);
4673         } else
4674                 spin_unlock_bh(&sess->conn_lock);
4675
4676         target_put_session(sess->se_sess);
4677         return 0;
4678 }
4679
4680 void iscsit_stop_session(
4681         struct iscsi_session *sess,
4682         int session_sleep,
4683         int connection_sleep)
4684 {
4685         u16 conn_count = atomic_read(&sess->nconn);
4686         struct iscsi_conn *conn, *conn_tmp = NULL;
4687         int is_last;
4688
4689         spin_lock_bh(&sess->conn_lock);
4690         if (session_sleep)
4691                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4692
4693         if (connection_sleep) {
4694                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4695                                 conn_list) {
4696                         if (conn_count == 0)
4697                                 break;
4698
4699                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4700                                 is_last = 1;
4701                         } else {
4702                                 iscsit_inc_conn_usage_count(conn_tmp);
4703                                 is_last = 0;
4704                         }
4705                         iscsit_inc_conn_usage_count(conn);
4706
4707                         spin_unlock_bh(&sess->conn_lock);
4708                         iscsit_cause_connection_reinstatement(conn, 1);
4709                         spin_lock_bh(&sess->conn_lock);
4710
4711                         iscsit_dec_conn_usage_count(conn);
4712                         if (is_last == 0)
4713                                 iscsit_dec_conn_usage_count(conn_tmp);
4714                         conn_count--;
4715                 }
4716         } else {
4717                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4718                         iscsit_cause_connection_reinstatement(conn, 0);
4719         }
4720
4721         if (session_sleep && atomic_read(&sess->nconn)) {
4722                 spin_unlock_bh(&sess->conn_lock);
4723                 wait_for_completion(&sess->session_wait_comp);
4724         } else
4725                 spin_unlock_bh(&sess->conn_lock);
4726 }
4727
4728 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4729 {
4730         struct iscsi_session *sess;
4731         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4732         struct se_session *se_sess, *se_sess_tmp;
4733         int session_count = 0;
4734
4735         spin_lock_bh(&se_tpg->session_lock);
4736         if (tpg->nsessions && !force) {
4737                 spin_unlock_bh(&se_tpg->session_lock);
4738                 return -1;
4739         }
4740
4741         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4742                         sess_list) {
4743                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4744
4745                 spin_lock(&sess->conn_lock);
4746                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4747                     atomic_read(&sess->session_logout) ||
4748                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4749                         spin_unlock(&sess->conn_lock);
4750                         continue;
4751                 }
4752                 atomic_set(&sess->session_reinstatement, 1);
4753                 spin_unlock(&sess->conn_lock);
4754                 spin_unlock_bh(&se_tpg->session_lock);
4755
4756                 iscsit_free_session(sess);
4757                 spin_lock_bh(&se_tpg->session_lock);
4758
4759                 session_count++;
4760         }
4761         spin_unlock_bh(&se_tpg->session_lock);
4762
4763         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4764                         " Group: %hu\n", session_count, tpg->tpgt);
4765         return 0;
4766 }
4767
4768 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4769 MODULE_VERSION("4.1.x");
4770 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4771 MODULE_LICENSE("GPL");
4772
4773 module_init(iscsi_target_init_module);
4774 module_exit(iscsi_target_cleanup_module);