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 enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 515 {
 516         return TARGET_PROT_NORMAL;
 517 }
 518
 519 static struct iscsit_transport iscsi_target_transport = {
 520         .name                   = "iSCSI/TCP",
 521         .transport_type         = ISCSI_TCP,
 522         .owner                  = NULL,
 523         .iscsit_setup_np        = iscsit_setup_np,
 524         .iscsit_accept_np       = iscsit_accept_np,
 525         .iscsit_free_np         = iscsit_free_np,
 526         .iscsit_get_login_rx    = iscsit_get_login_rx,
 527         .iscsit_put_login_tx    = iscsit_put_login_tx,
 528         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 529         .iscsit_immediate_queue = iscsit_immediate_queue,
 530         .iscsit_response_queue  = iscsit_response_queue,
 531         .iscsit_queue_data_in   = iscsit_queue_rsp,
 532         .iscsit_queue_status    = iscsit_queue_rsp,
 533         .iscsit_aborted_task    = iscsit_aborted_task,
 534         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 535 };
 536
 537 static int __init iscsi_target_init_module(void)
 538 {
 539         int ret = 0;
 540
 541         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 542
 543         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 544         if (!iscsit_global) {
 545                 pr_err("Unable to allocate memory for iscsit_global\n");
 546                 return -1;
 547         }
 548         mutex_init(&auth_id_lock);
 549         spin_lock_init(&sess_idr_lock);
 550         idr_init(&tiqn_idr);
 551         idr_init(&sess_idr);
 552
 553         ret = iscsi_target_register_configfs();
 554         if (ret < 0)
 555                 goto out;
 556
 557         ret = iscsi_thread_set_init();
 558         if (ret < 0)
 559                 goto configfs_out;
 560
 561         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 562                         TARGET_THREAD_SET_COUNT) {
 563                 pr_err("iscsi_allocate_thread_sets() returned"
 564                         " unexpected value!\n");
 565                 goto ts_out1;
 566         }
 567
 568         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 569                         sizeof(struct iscsi_queue_req),
 570                         __alignof__(struct iscsi_queue_req), 0, NULL);
 571         if (!lio_qr_cache) {
 572                 pr_err("nable to kmem_cache_create() for"
 573                                 " lio_qr_cache\n");
 574                 goto ts_out2;
 575         }
 576
 577         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 578                         sizeof(struct iscsi_datain_req),
 579                         __alignof__(struct iscsi_datain_req), 0, NULL);
 580         if (!lio_dr_cache) {
 581                 pr_err("Unable to kmem_cache_create() for"
 582                                 " lio_dr_cache\n");
 583                 goto qr_out;
 584         }
 585
 586         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 587                         sizeof(struct iscsi_ooo_cmdsn),
 588                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 589         if (!lio_ooo_cache) {
 590                 pr_err("Unable to kmem_cache_create() for"
 591                                 " lio_ooo_cache\n");
 592                 goto dr_out;
 593         }
 594
 595         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 596                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 597                         0, NULL);
 598         if (!lio_r2t_cache) {
 599                 pr_err("Unable to kmem_cache_create() for"
 600                                 " lio_r2t_cache\n");
 601                 goto ooo_out;
 602         }
 603
 604         iscsit_register_transport(&iscsi_target_transport);
 605
 606         if (iscsit_load_discovery_tpg() < 0)
 607                 goto r2t_out;
 608
 609         return ret;
 610 r2t_out:
 611         kmem_cache_destroy(lio_r2t_cache);
 612 ooo_out:
 613         kmem_cache_destroy(lio_ooo_cache);
 614 dr_out:
 615         kmem_cache_destroy(lio_dr_cache);
 616 qr_out:
 617         kmem_cache_destroy(lio_qr_cache);
 618 ts_out2:
 619         iscsi_deallocate_thread_sets();
 620 ts_out1:
 621         iscsi_thread_set_free();
 622 configfs_out:
 623         iscsi_target_deregister_configfs();
 624 out:
 625         kfree(iscsit_global);
 626         return -ENOMEM;
 627 }
 628
 629 static void __exit iscsi_target_cleanup_module(void)
 630 {
 631         iscsi_deallocate_thread_sets();
 632         iscsi_thread_set_free();
 633         iscsit_release_discovery_tpg();
 634         iscsit_unregister_transport(&iscsi_target_transport);
 635         kmem_cache_destroy(lio_qr_cache);
 636         kmem_cache_destroy(lio_dr_cache);
 637         kmem_cache_destroy(lio_ooo_cache);
 638         kmem_cache_destroy(lio_r2t_cache);
 639
 640         iscsi_target_deregister_configfs();
 641
 642         kfree(iscsit_global);
 643 }
 644
 645 static int iscsit_add_reject(
 646         struct iscsi_conn *conn,
 647         u8 reason,
 648         unsigned char *buf)
 649 {
 650         struct iscsi_cmd *cmd;
 651
 652         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 653         if (!cmd)
 654                 return -1;
 655
 656         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 657         cmd->reject_reason = reason;
 658
 659         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 660         if (!cmd->buf_ptr) {
 661                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 662                 iscsit_free_cmd(cmd, false);
 663                 return -1;
 664         }
 665
 666         spin_lock_bh(&conn->cmd_lock);
 667         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 668         spin_unlock_bh(&conn->cmd_lock);
 669
 670         cmd->i_state = ISTATE_SEND_REJECT;
 671         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 672
 673         return -1;
 674 }
 675
 676 static int iscsit_add_reject_from_cmd(
 677         struct iscsi_cmd *cmd,
 678         u8 reason,
 679         bool add_to_conn,
 680         unsigned char *buf)
 681 {
 682         struct iscsi_conn *conn;
 683
 684         if (!cmd->conn) {
 685                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 686                                 cmd->init_task_tag);
 687                 return -1;
 688         }
 689         conn = cmd->conn;
 690
 691         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 692         cmd->reject_reason = reason;
 693
 694         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 695         if (!cmd->buf_ptr) {
 696                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 697                 iscsit_free_cmd(cmd, false);
 698                 return -1;
 699         }
 700
 701         if (add_to_conn) {
 702                 spin_lock_bh(&conn->cmd_lock);
 703                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 704                 spin_unlock_bh(&conn->cmd_lock);
 705         }
 706
 707         cmd->i_state = ISTATE_SEND_REJECT;
 708         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 709         /*
 710          * Perform the kref_put now if se_cmd has already been setup by
 711          * scsit_setup_scsi_cmd()
 712          */
 713         if (cmd->se_cmd.se_tfo != NULL) {
 714                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 715                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 716         }
 717         return -1;
 718 }
 719
 720 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 721                                  unsigned char *buf)
 722 {
 723         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 724 }
 725
 726 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 727 {
 728         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 729 }
 730
 731 /*
 732  * Map some portion of the allocated scatterlist to an iovec, suitable for
 733  * kernel sockets to copy data in/out.
 734  */
 735 static int iscsit_map_iovec(
 736         struct iscsi_cmd *cmd,
 737         struct kvec *iov,
 738         u32 data_offset,
 739         u32 data_length)
 740 {
 741         u32 i = 0;
 742         struct scatterlist *sg;
 743         unsigned int page_off;
 744
 745         /*
 746          * We know each entry in t_data_sg contains a page.
 747          */
 748         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 749         page_off = (data_offset % PAGE_SIZE);
 750
 751         cmd->first_data_sg = sg;
 752         cmd->first_data_sg_off = page_off;
 753
 754         while (data_length) {
 755                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 756
 757                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 758                 iov[i].iov_len = cur_len;
 759
 760                 data_length -= cur_len;
 761                 page_off = 0;
 762                 sg = sg_next(sg);
 763                 i++;
 764         }
 765
 766         cmd->kmapped_nents = i;
 767
 768         return i;
 769 }
 770
 771 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 772 {
 773         u32 i;
 774         struct scatterlist *sg;
 775
 776         sg = cmd->first_data_sg;
 777
 778         for (i = 0; i < cmd->kmapped_nents; i++)
 779                 kunmap(sg_page(&sg[i]));
 780 }
 781
 782 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 783 {
 784         LIST_HEAD(ack_list);
 785         struct iscsi_cmd *cmd, *cmd_p;
 786
 787         conn->exp_statsn = exp_statsn;
 788
 789         if (conn->sess->sess_ops->RDMAExtensions)
 790                 return;
 791
 792         spin_lock_bh(&conn->cmd_lock);
 793         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 794                 spin_lock(&cmd->istate_lock);
 795                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 796                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 797                         cmd->i_state = ISTATE_REMOVE;
 798                         spin_unlock(&cmd->istate_lock);
 799                         list_move_tail(&cmd->i_conn_node, &ack_list);
 800                         continue;
 801                 }
 802                 spin_unlock(&cmd->istate_lock);
 803         }
 804         spin_unlock_bh(&conn->cmd_lock);
 805
 806         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 807                 list_del_init(&cmd->i_conn_node);
 808                 iscsit_free_cmd(cmd, false);
 809         }
 810 }
 811
 812 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 813 {
 814         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 815
 816         iov_count += ISCSI_IOV_DATA_BUFFER;
 817
 818         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 819         if (!cmd->iov_data) {
 820                 pr_err("Unable to allocate cmd->iov_data\n");
 821                 return -ENOMEM;
 822         }
 823
 824         cmd->orig_iov_data_count = iov_count;
 825         return 0;
 826 }
 827
 828 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 829                           unsigned char *buf)
 830 {
 831         int data_direction, payload_length;
 832         struct iscsi_scsi_req *hdr;
 833         int iscsi_task_attr;
 834         int sam_task_attr;
 835
 836         atomic_long_inc(&conn->sess->cmd_pdus);
 837
 838         hdr                     = (struct iscsi_scsi_req *) buf;
 839         payload_length          = ntoh24(hdr->dlength);
 840
 841         /* FIXME; Add checks for AdditionalHeaderSegment */
 842
 843         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 844             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 845                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 846                                 " not set. Bad iSCSI Initiator.\n");
 847                 return iscsit_add_reject_cmd(cmd,
 848                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 849         }
 850
 851         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 852              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 853                 /*
 854                  * From RFC-3720 Section 10.3.1:
 855                  *
 856                  * "Either or both of R and W MAY be 1 when either the
 857                  *  Expected Data Transfer Length and/or Bidirectional Read
 858                  *  Expected Data Transfer Length are 0"
 859                  *
 860                  * For this case, go ahead and clear the unnecssary bits
 861                  * to avoid any confusion with ->data_direction.
 862                  */
 863                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 864                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 865
 866                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 867                         " set when Expected Data Transfer Length is 0 for"
 868                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 869         }
 870
 871         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 872             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 873                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 874                         " MUST be set if Expected Data Transfer Length is not 0."
 875                         " Bad iSCSI Initiator\n");
 876                 return iscsit_add_reject_cmd(cmd,
 877                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 878         }
 879
 880         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 881             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 882                 pr_err("Bidirectional operations not supported!\n");
 883                 return iscsit_add_reject_cmd(cmd,
 884                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 885         }
 886
 887         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 888                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 889                                 " Scsi Command PDU.\n");
 890                 return iscsit_add_reject_cmd(cmd,
 891                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 892         }
 893
 894         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 895                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 896                         " protocol error.\n", payload_length);
 897                 return iscsit_add_reject_cmd(cmd,
 898                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 899         }
 900
 901         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 902             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 903                 pr_err("Expected Data Transfer Length and Length of"
 904                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 905                         " bit is not set protocol error\n");
 906                 return iscsit_add_reject_cmd(cmd,
 907                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 908         }
 909
 910         if (payload_length > be32_to_cpu(hdr->data_length)) {
 911                 pr_err("DataSegmentLength: %u is greater than"
 912                         " EDTL: %u, protocol error.\n", payload_length,
 913                                 hdr->data_length);
 914                 return iscsit_add_reject_cmd(cmd,
 915                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 916         }
 917
 918         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 919                 pr_err("DataSegmentLength: %u is greater than"
 920                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 921                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 922                 return iscsit_add_reject_cmd(cmd,
 923                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 924         }
 925
 926         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 927                 pr_err("DataSegmentLength: %u is greater than"
 928                         " FirstBurstLength: %u, protocol error.\n",
 929                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 930                 return iscsit_add_reject_cmd(cmd,
 931                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 932         }
 933
 934         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 935                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 936                           DMA_NONE;
 937
 938         cmd->data_direction = data_direction;
 939         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 940         /*
 941          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 942          */
 943         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 944             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 945                 sam_task_attr = MSG_SIMPLE_TAG;
 946         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 947                 sam_task_attr = MSG_ORDERED_TAG;
 948         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 949                 sam_task_attr = MSG_HEAD_TAG;
 950         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 951                 sam_task_attr = MSG_ACA_TAG;
 952         else {
 953                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 954                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 955                 sam_task_attr = MSG_SIMPLE_TAG;
 956         }
 957
 958         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 959         cmd->i_state            = ISTATE_NEW_CMD;
 960         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 961         cmd->immediate_data     = (payload_length) ? 1 : 0;
 962         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 963                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 964         if (cmd->unsolicited_data)
 965                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 966
 967         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 968         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 969                 spin_lock_bh(&conn->sess->ttt_lock);
 970                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 971                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 972                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 973                 spin_unlock_bh(&conn->sess->ttt_lock);
 974         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 975                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 976         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 977         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 978         cmd->first_burst_len    = payload_length;
 979
 980         if (!conn->sess->sess_ops->RDMAExtensions &&
 981              cmd->data_direction == DMA_FROM_DEVICE) {
 982                 struct iscsi_datain_req *dr;
 983
 984                 dr = iscsit_allocate_datain_req();
 985                 if (!dr)
 986                         return iscsit_add_reject_cmd(cmd,
 987                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 988
 989                 iscsit_attach_datain_req(cmd, dr);
 990         }
 991
 992         /*
 993          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 994          */
 995         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 996                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 997                         cmd->data_direction, sam_task_attr,
 998                         cmd->sense_buffer + 2);
 999
1000         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1001                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1002                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1003                 conn->cid);
1004
1005         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1006
1007         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1008                                                      scsilun_to_int(&hdr->lun));
1009         if (cmd->sense_reason)
1010                 goto attach_cmd;
1011
1012         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1013         if (cmd->sense_reason) {
1014                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1015                         return iscsit_add_reject_cmd(cmd,
1016                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1017                 }
1018
1019                 goto attach_cmd;
1020         }
1021
1022         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1023                 return iscsit_add_reject_cmd(cmd,
1024                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1025         }
1026
1027 attach_cmd:
1028         spin_lock_bh(&conn->cmd_lock);
1029         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1030         spin_unlock_bh(&conn->cmd_lock);
1031         /*
1032          * Check if we need to delay processing because of ALUA
1033          * Active/NonOptimized primary access state..
1034          */
1035         core_alua_check_nonop_delay(&cmd->se_cmd);
1036
1037         return 0;
1038 }
1039 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1040
1041 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1042 {
1043         iscsit_set_dataout_sequence_values(cmd);
1044
1045         spin_lock_bh(&cmd->dataout_timeout_lock);
1046         iscsit_start_dataout_timer(cmd, cmd->conn);
1047         spin_unlock_bh(&cmd->dataout_timeout_lock);
1048 }
1049 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1050
1051 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1052                             struct iscsi_scsi_req *hdr)
1053 {
1054         int cmdsn_ret = 0;
1055         /*
1056          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1057          * the Immediate Bit is not set, and no Immediate
1058          * Data is attached.
1059          *
1060          * A PDU/CmdSN carrying Immediate Data can only
1061          * be processed after the DataCRC has passed.
1062          * If the DataCRC fails, the CmdSN MUST NOT
1063          * be acknowledged. (See below)
1064          */
1065         if (!cmd->immediate_data) {
1066                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1067                                         (unsigned char *)hdr, hdr->cmdsn);
1068                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1069                         return -1;
1070                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1071                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1072                         return 0;
1073                 }
1074         }
1075
1076         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1077
1078         /*
1079          * If no Immediate Data is attached, it's OK to return now.
1080          */
1081         if (!cmd->immediate_data) {
1082                 if (!cmd->sense_reason && cmd->unsolicited_data)
1083                         iscsit_set_unsoliticed_dataout(cmd);
1084                 if (!cmd->sense_reason)
1085                         return 0;
1086
1087                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1088                 return 0;
1089         }
1090
1091         /*
1092          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1093          * execution.  These exceptions are processed in CmdSN order using
1094          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1095          */
1096         if (cmd->sense_reason) {
1097                 if (cmd->reject_reason)
1098                         return 0;
1099
1100                 return 1;
1101         }
1102         /*
1103          * Call directly into transport_generic_new_cmd() to perform
1104          * the backend memory allocation.
1105          */
1106         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1107         if (cmd->sense_reason)
1108                 return 1;
1109
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1113
1114 static int
1115 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1116                           bool dump_payload)
1117 {
1118         struct iscsi_conn *conn = cmd->conn;
1119         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1120         /*
1121          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1122          */
1123         if (dump_payload == true)
1124                 goto after_immediate_data;
1125
1126         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1127                                         cmd->first_burst_len);
1128 after_immediate_data:
1129         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1130                 /*
1131                  * A PDU/CmdSN carrying Immediate Data passed
1132                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1133                  * Immediate Bit is not set.
1134                  */
1135                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1136                                         (unsigned char *)hdr, hdr->cmdsn);
1137                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1138                         return -1;
1139
1140                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1141                         int rc;
1142
1143                         rc = iscsit_dump_data_payload(cmd->conn,
1144                                                       cmd->first_burst_len, 1);
1145                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1146                         return rc;
1147                 } else if (cmd->unsolicited_data)
1148                         iscsit_set_unsoliticed_dataout(cmd);
1149
1150         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1151                 /*
1152                  * Immediate Data failed DataCRC and ERL>=1,
1153                  * silently drop this PDU and let the initiator
1154                  * plug the CmdSN gap.
1155                  *
1156                  * FIXME: Send Unsolicited NOPIN with reserved
1157                  * TTT here to help the initiator figure out
1158                  * the missing CmdSN, although they should be
1159                  * intelligent enough to determine the missing
1160                  * CmdSN and issue a retry to plug the sequence.
1161                  */
1162                 cmd->i_state = ISTATE_REMOVE;
1163                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1164         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1165                 return -1;
1166
1167         return 0;
1168 }
1169
1170 static int
1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1172                            unsigned char *buf)
1173 {
1174         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1175         int rc, immed_data;
1176         bool dump_payload = false;
1177
1178         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1179         if (rc < 0)
1180                 return 0;
1181         /*
1182          * Allocation iovecs needed for struct socket operations for
1183          * traditional iSCSI block I/O.
1184          */
1185         if (iscsit_allocate_iovecs(cmd) < 0) {
1186                 return iscsit_add_reject_cmd(cmd,
1187                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1188         }
1189         immed_data = cmd->immediate_data;
1190
1191         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1192         if (rc < 0)
1193                 return rc;
1194         else if (rc > 0)
1195                 dump_payload = true;
1196
1197         if (!immed_data)
1198                 return 0;
1199
1200         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1201 }
1202
1203 static u32 iscsit_do_crypto_hash_sg(
1204         struct hash_desc *hash,
1205         struct iscsi_cmd *cmd,
1206         u32 data_offset,
1207         u32 data_length,
1208         u32 padding,
1209         u8 *pad_bytes)
1210 {
1211         u32 data_crc;
1212         u32 i;
1213         struct scatterlist *sg;
1214         unsigned int page_off;
1215
1216         crypto_hash_init(hash);
1217
1218         sg = cmd->first_data_sg;
1219         page_off = cmd->first_data_sg_off;
1220
1221         i = 0;
1222         while (data_length) {
1223                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1224
1225                 crypto_hash_update(hash, &sg[i], cur_len);
1226
1227                 data_length -= cur_len;
1228                 page_off = 0;
1229                 i++;
1230         }
1231
1232         if (padding) {
1233                 struct scatterlist pad_sg;
1234
1235                 sg_init_one(&pad_sg, pad_bytes, padding);
1236                 crypto_hash_update(hash, &pad_sg, padding);
1237         }
1238         crypto_hash_final(hash, (u8 *) &data_crc);
1239
1240         return data_crc;
1241 }
1242
1243 static void iscsit_do_crypto_hash_buf(
1244         struct hash_desc *hash,
1245         const void *buf,
1246         u32 payload_length,
1247         u32 padding,
1248         u8 *pad_bytes,
1249         u8 *data_crc)
1250 {
1251         struct scatterlist sg;
1252
1253         crypto_hash_init(hash);
1254
1255         sg_init_one(&sg, buf, payload_length);
1256         crypto_hash_update(hash, &sg, payload_length);
1257
1258         if (padding) {
1259                 sg_init_one(&sg, pad_bytes, padding);
1260                 crypto_hash_update(hash, &sg, padding);
1261         }
1262         crypto_hash_final(hash, data_crc);
1263 }
1264
1265 int
1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1267                           struct iscsi_cmd **out_cmd)
1268 {
1269         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1270         struct iscsi_cmd *cmd = NULL;
1271         struct se_cmd *se_cmd;
1272         u32 payload_length = ntoh24(hdr->dlength);
1273         int rc;
1274
1275         if (!payload_length) {
1276                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1277                 return 0;
1278         }
1279
1280         /* iSCSI write */
1281         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1282
1283         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1284                 pr_err("DataSegmentLength: %u is greater than"
1285                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1286                         conn->conn_ops->MaxXmitDataSegmentLength);
1287                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1288                                          buf);
1289         }
1290
1291         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1292                         payload_length);
1293         if (!cmd)
1294                 return 0;
1295
1296         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1297                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1298                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1299                 payload_length, conn->cid);
1300
1301         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1302                 pr_err("Command ITT: 0x%08x received DataOUT after"
1303                         " last DataOUT received, dumping payload\n",
1304                         cmd->init_task_tag);
1305                 return iscsit_dump_data_payload(conn, payload_length, 1);
1306         }
1307
1308         if (cmd->data_direction != DMA_TO_DEVICE) {
1309                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1310                         " NON-WRITE command.\n", cmd->init_task_tag);
1311                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1312         }
1313         se_cmd = &cmd->se_cmd;
1314         iscsit_mod_dataout_timer(cmd);
1315
1316         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1317                 pr_err("DataOut Offset: %u, Length %u greater than"
1318                         " iSCSI Command EDTL %u, protocol error.\n",
1319                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1320                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1321         }
1322
1323         if (cmd->unsolicited_data) {
1324                 int dump_unsolicited_data = 0;
1325
1326                 if (conn->sess->sess_ops->InitialR2T) {
1327                         pr_err("Received unexpected unsolicited data"
1328                                 " while InitialR2T=Yes, protocol error.\n");
1329                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1330                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1331                         return -1;
1332                 }
1333                 /*
1334                  * Special case for dealing with Unsolicited DataOUT
1335                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1336                  * failures;
1337                  */
1338
1339                 /* Something's amiss if we're not in WRITE_PENDING state... */
1340                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1341                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1342                         dump_unsolicited_data = 1;
1343
1344                 if (dump_unsolicited_data) {
1345                         /*
1346                          * Check if a delayed TASK_ABORTED status needs to
1347                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1348                          * received with the unsolicitied data out.
1349                          */
1350                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1351                                 iscsit_stop_dataout_timer(cmd);
1352
1353                         transport_check_aborted_status(se_cmd,
1354                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1355                         return iscsit_dump_data_payload(conn, payload_length, 1);
1356                 }
1357         } else {
1358                 /*
1359                  * For the normal solicited data path:
1360                  *
1361                  * Check for a delayed TASK_ABORTED status and dump any
1362                  * incoming data out payload if one exists.  Also, when the
1363                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1364                  * data out sequence, we decrement outstanding_r2ts.  Once
1365                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1366                  * TASK_ABORTED status.
1367                  */
1368                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1369                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1370                                 if (--cmd->outstanding_r2ts < 1) {
1371                                         iscsit_stop_dataout_timer(cmd);
1372                                         transport_check_aborted_status(
1373                                                         se_cmd, 1);
1374                                 }
1375
1376                         return iscsit_dump_data_payload(conn, payload_length, 1);
1377                 }
1378         }
1379         /*
1380          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1381          * within-command recovery checks before receiving the payload.
1382          */
1383         rc = iscsit_check_pre_dataout(cmd, buf);
1384         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1385                 return 0;
1386         else if (rc == DATAOUT_CANNOT_RECOVER)
1387                 return -1;
1388
1389         *out_cmd = cmd;
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1393
1394 static int
1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1396                    struct iscsi_data *hdr)
1397 {
1398         struct kvec *iov;
1399         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1400         u32 payload_length = ntoh24(hdr->dlength);
1401         int iov_ret, data_crc_failed = 0;
1402
1403         rx_size += payload_length;
1404         iov = &cmd->iov_data[0];
1405
1406         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1407                                    payload_length);
1408         if (iov_ret < 0)
1409                 return -1;
1410
1411         iov_count += iov_ret;
1412
1413         padding = ((-payload_length) & 3);
1414         if (padding != 0) {
1415                 iov[iov_count].iov_base = cmd->pad_bytes;
1416                 iov[iov_count++].iov_len = padding;
1417                 rx_size += padding;
1418                 pr_debug("Receiving %u padding bytes.\n", padding);
1419         }
1420
1421         if (conn->conn_ops->DataDigest) {
1422                 iov[iov_count].iov_base = &checksum;
1423                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1424                 rx_size += ISCSI_CRC_LEN;
1425         }
1426
1427         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1428
1429         iscsit_unmap_iovec(cmd);
1430
1431         if (rx_got != rx_size)
1432                 return -1;
1433
1434         if (conn->conn_ops->DataDigest) {
1435                 u32 data_crc;
1436
1437                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1438                                                     be32_to_cpu(hdr->offset),
1439                                                     payload_length, padding,
1440                                                     cmd->pad_bytes);
1441
1442                 if (checksum != data_crc) {
1443                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1444                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1445                                 " does not match computed 0x%08x\n",
1446                                 hdr->itt, hdr->offset, payload_length,
1447                                 hdr->datasn, checksum, data_crc);
1448                         data_crc_failed = 1;
1449                 } else {
1450                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1451                                 " %u bytes of Data Out\n", checksum,
1452                                 payload_length);
1453                 }
1454         }
1455
1456         return data_crc_failed;
1457 }
1458
1459 int
1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1461                              bool data_crc_failed)
1462 {
1463         struct iscsi_conn *conn = cmd->conn;
1464         int rc, ooo_cmdsn;
1465         /*
1466          * Increment post receive data and CRC values or perform
1467          * within-command recovery.
1468          */
1469         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1470         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1471                 return 0;
1472         else if (rc == DATAOUT_SEND_R2T) {
1473                 iscsit_set_dataout_sequence_values(cmd);
1474                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1475         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1476                 /*
1477                  * Handle extra special case for out of order
1478                  * Unsolicited Data Out.
1479                  */
1480                 spin_lock_bh(&cmd->istate_lock);
1481                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1482                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1483                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1484                 spin_unlock_bh(&cmd->istate_lock);
1485
1486                 iscsit_stop_dataout_timer(cmd);
1487                 if (ooo_cmdsn)
1488                         return 0;
1489                 target_execute_cmd(&cmd->se_cmd);
1490                 return 0;
1491         } else /* DATAOUT_CANNOT_RECOVER */
1492                 return -1;
1493
1494         return 0;
1495 }
1496 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1497
1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1499 {
1500         struct iscsi_cmd *cmd = NULL;
1501         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1502         int rc;
1503         bool data_crc_failed = false;
1504
1505         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1506         if (rc < 0)
1507                 return 0;
1508         else if (!cmd)
1509                 return 0;
1510
1511         rc = iscsit_get_dataout(conn, cmd, hdr);
1512         if (rc < 0)
1513                 return rc;
1514         else if (rc > 0)
1515                 data_crc_failed = true;
1516
1517         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1518 }
1519
1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1521                          struct iscsi_nopout *hdr)
1522 {
1523         u32 payload_length = ntoh24(hdr->dlength);
1524
1525         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1526                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1527                 if (!cmd)
1528                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1529                                                  (unsigned char *)hdr);
1530
1531                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1532                                          (unsigned char *)hdr);
1533         }
1534
1535         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1536                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1537                         " not set, protocol error.\n");
1538                 if (!cmd)
1539                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540                                                  (unsigned char *)hdr);
1541
1542                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543                                          (unsigned char *)hdr);
1544         }
1545
1546         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1548                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1549                         " error.\n", payload_length,
1550                         conn->conn_ops->MaxXmitDataSegmentLength);
1551                 if (!cmd)
1552                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1553                                                  (unsigned char *)hdr);
1554
1555                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1556                                          (unsigned char *)hdr);
1557         }
1558
1559         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1560                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1561                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1562                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1563                 payload_length);
1564         /*
1565          * This is not a response to a Unsolicited NopIN, which means
1566          * it can either be a NOPOUT ping request (with a valid ITT),
1567          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568          * Either way, make sure we allocate an struct iscsi_cmd, as both
1569          * can contain ping data.
1570          */
1571         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1572                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1573                 cmd->i_state            = ISTATE_SEND_NOPIN;
1574                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575                                                 1 : 0);
1576                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1578                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1579                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1580                 cmd->data_direction     = DMA_NONE;
1581         }
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL(iscsit_setup_nop_out);
1586
1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588                            struct iscsi_nopout *hdr)
1589 {
1590         struct iscsi_cmd *cmd_p = NULL;
1591         int cmdsn_ret = 0;
1592         /*
1593          * Initiator is expecting a NopIN ping reply..
1594          */
1595         if (hdr->itt != RESERVED_ITT) {
1596                 BUG_ON(!cmd);
1597
1598                 spin_lock_bh(&conn->cmd_lock);
1599                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1600                 spin_unlock_bh(&conn->cmd_lock);
1601
1602                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1603
1604                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1605                         iscsit_add_cmd_to_response_queue(cmd, conn,
1606                                                          cmd->i_state);
1607                         return 0;
1608                 }
1609
1610                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1611                                 (unsigned char *)hdr, hdr->cmdsn);
1612                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1613                         return 0;
1614                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1615                         return -1;
1616
1617                 return 0;
1618         }
1619         /*
1620          * This was a response to a unsolicited NOPIN ping.
1621          */
1622         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1623                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1624                 if (!cmd_p)
1625                         return -EINVAL;
1626
1627                 iscsit_stop_nopin_response_timer(conn);
1628
1629                 cmd_p->i_state = ISTATE_REMOVE;
1630                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1631
1632                 iscsit_start_nopin_timer(conn);
1633                 return 0;
1634         }
1635         /*
1636          * Otherwise, initiator is not expecting a NOPIN is response.
1637          * Just ignore for now.
1638          */
1639         return 0;
1640 }
1641 EXPORT_SYMBOL(iscsit_process_nop_out);
1642
1643 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1644                                  unsigned char *buf)
1645 {
1646         unsigned char *ping_data = NULL;
1647         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1648         struct kvec *iov = NULL;
1649         u32 payload_length = ntoh24(hdr->dlength);
1650         int ret;
1651
1652         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1653         if (ret < 0)
1654                 return 0;
1655         /*
1656          * Handle NOP-OUT payload for traditional iSCSI sockets
1657          */
1658         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1659                 u32 checksum, data_crc, padding = 0;
1660                 int niov = 0, rx_got, rx_size = payload_length;
1661
1662                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1663                 if (!ping_data) {
1664                         pr_err("Unable to allocate memory for"
1665                                 " NOPOUT ping data.\n");
1666                         ret = -1;
1667                         goto out;
1668                 }
1669
1670                 iov = &cmd->iov_misc[0];
1671                 iov[niov].iov_base      = ping_data;
1672                 iov[niov++].iov_len     = payload_length;
1673
1674                 padding = ((-payload_length) & 3);
1675                 if (padding != 0) {
1676                         pr_debug("Receiving %u additional bytes"
1677                                 " for padding.\n", padding);
1678                         iov[niov].iov_base      = &cmd->pad_bytes;
1679                         iov[niov++].iov_len     = padding;
1680                         rx_size += padding;
1681                 }
1682                 if (conn->conn_ops->DataDigest) {
1683                         iov[niov].iov_base      = &checksum;
1684                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1685                         rx_size += ISCSI_CRC_LEN;
1686                 }
1687
1688                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1689                 if (rx_got != rx_size) {
1690                         ret = -1;
1691                         goto out;
1692                 }
1693
1694                 if (conn->conn_ops->DataDigest) {
1695                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1696                                         ping_data, payload_length,
1697                                         padding, cmd->pad_bytes,
1698                                         (u8 *)&data_crc);
1699
1700                         if (checksum != data_crc) {
1701                                 pr_err("Ping data CRC32C DataDigest"
1702                                 " 0x%08x does not match computed 0x%08x\n",
1703                                         checksum, data_crc);
1704                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1705                                         pr_err("Unable to recover from"
1706                                         " NOPOUT Ping DataCRC failure while in"
1707                                                 " ERL=0.\n");
1708                                         ret = -1;
1709                                         goto out;
1710                                 } else {
1711                                         /*
1712                                          * Silently drop this PDU and let the
1713                                          * initiator plug the CmdSN gap.
1714                                          */
1715                                         pr_debug("Dropping NOPOUT"
1716                                         " Command CmdSN: 0x%08x due to"
1717                                         " DataCRC error.\n", hdr->cmdsn);
1718                                         ret = 0;
1719                                         goto out;
1720                                 }
1721                         } else {
1722                                 pr_debug("Got CRC32C DataDigest"
1723                                 " 0x%08x for %u bytes of ping data.\n",
1724                                         checksum, payload_length);
1725                         }
1726                 }
1727
1728                 ping_data[payload_length] = '\0';
1729                 /*
1730                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1731                  */
1732                 cmd->buf_ptr = ping_data;
1733                 cmd->buf_ptr_size = payload_length;
1734
1735                 pr_debug("Got %u bytes of NOPOUT ping"
1736                         " data.\n", payload_length);
1737                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1738         }
1739
1740         return iscsit_process_nop_out(conn, cmd, hdr);
1741 out:
1742         if (cmd)
1743                 iscsit_free_cmd(cmd, false);
1744
1745         kfree(ping_data);
1746         return ret;
1747 }
1748
1749 int
1750 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1751                            unsigned char *buf)
1752 {
1753         struct se_tmr_req *se_tmr;
1754         struct iscsi_tmr_req *tmr_req;
1755         struct iscsi_tm *hdr;
1756         int out_of_order_cmdsn = 0, ret;
1757         bool sess_ref = false;
1758         u8 function;
1759
1760         hdr                     = (struct iscsi_tm *) buf;
1761         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1762         function = hdr->flags;
1763
1764         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1765                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1766                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1767                 hdr->rtt, hdr->refcmdsn, conn->cid);
1768
1769         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1770             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1771              hdr->rtt != RESERVED_ITT)) {
1772                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1773                 hdr->rtt = RESERVED_ITT;
1774         }
1775
1776         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1777                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1778                 pr_err("Task Management Request TASK_REASSIGN not"
1779                         " issued as immediate command, bad iSCSI Initiator"
1780                                 "implementation\n");
1781                 return iscsit_add_reject_cmd(cmd,
1782                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1783         }
1784         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1785             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1786                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1787
1788         cmd->data_direction = DMA_NONE;
1789
1790         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1791         if (!cmd->tmr_req) {
1792                 pr_err("Unable to allocate memory for"
1793                         " Task Management command!\n");
1794                 return iscsit_add_reject_cmd(cmd,
1795                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1796                                              buf);
1797         }
1798
1799         /*
1800          * TASK_REASSIGN for ERL=2 / connection stays inside of
1801          * LIO-Target $FABRIC_MOD
1802          */
1803         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1804
1805                 u8 tcm_function;
1806                 int ret;
1807
1808                 transport_init_se_cmd(&cmd->se_cmd,
1809                                       &lio_target_fabric_configfs->tf_ops,
1810                                       conn->sess->se_sess, 0, DMA_NONE,
1811                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1812
1813                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1814                 sess_ref = true;
1815
1816                 switch (function) {
1817                 case ISCSI_TM_FUNC_ABORT_TASK:
1818                         tcm_function = TMR_ABORT_TASK;
1819                         break;
1820                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1821                         tcm_function = TMR_ABORT_TASK_SET;
1822                         break;
1823                 case ISCSI_TM_FUNC_CLEAR_ACA:
1824                         tcm_function = TMR_CLEAR_ACA;
1825                         break;
1826                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1827                         tcm_function = TMR_CLEAR_TASK_SET;
1828                         break;
1829                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1830                         tcm_function = TMR_LUN_RESET;
1831                         break;
1832                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1833                         tcm_function = TMR_TARGET_WARM_RESET;
1834                         break;
1835                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1836                         tcm_function = TMR_TARGET_COLD_RESET;
1837                         break;
1838                 default:
1839                         pr_err("Unknown iSCSI TMR Function:"
1840                                " 0x%02x\n", function);
1841                         return iscsit_add_reject_cmd(cmd,
1842                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1843                 }
1844
1845                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846                                          tcm_function, GFP_KERNEL);
1847                 if (ret < 0)
1848                         return iscsit_add_reject_cmd(cmd,
1849                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1850
1851                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1852         }
1853
1854         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1855         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1856         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1857         cmd->init_task_tag      = hdr->itt;
1858         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1859         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1860         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1861         se_tmr                  = cmd->se_cmd.se_tmr_req;
1862         tmr_req                 = cmd->tmr_req;
1863         /*
1864          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1865          */
1866         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1867                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1868                                                scsilun_to_int(&hdr->lun));
1869                 if (ret < 0) {
1870                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1871                         goto attach;
1872                 }
1873         }
1874
1875         switch (function) {
1876         case ISCSI_TM_FUNC_ABORT_TASK:
1877                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1878                 if (se_tmr->response)
1879                         goto attach;
1880                 break;
1881         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1882         case ISCSI_TM_FUNC_CLEAR_ACA:
1883         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1884         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1885                 break;
1886         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1887                 if (iscsit_tmr_task_warm_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_TARGET_COLD_RESET:
1893                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1894                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1895                         goto attach;
1896                 }
1897                 break;
1898         case ISCSI_TM_FUNC_TASK_REASSIGN:
1899                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1900                 /*
1901                  * Perform sanity checks on the ExpDataSN only if the
1902                  * TASK_REASSIGN was successful.
1903                  */
1904                 if (se_tmr->response)
1905                         break;
1906
1907                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1908                         return iscsit_add_reject_cmd(cmd,
1909                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1910                 break;
1911         default:
1912                 pr_err("Unknown TMR function: 0x%02x, protocol"
1913                         " error.\n", function);
1914                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1915                 goto attach;
1916         }
1917
1918         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1919             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1920                 se_tmr->call_transport = 1;
1921 attach:
1922         spin_lock_bh(&conn->cmd_lock);
1923         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1924         spin_unlock_bh(&conn->cmd_lock);
1925
1926         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1927                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1928                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1929                         out_of_order_cmdsn = 1;
1930                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1931                         return 0;
1932                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1933                         return -1;
1934         }
1935         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1936
1937         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1938                 return 0;
1939         /*
1940          * Found the referenced task, send to transport for processing.
1941          */
1942         if (se_tmr->call_transport)
1943                 return transport_generic_handle_tmr(&cmd->se_cmd);
1944
1945         /*
1946          * Could not find the referenced LUN, task, or Task Management
1947          * command not authorized or supported.  Change state and
1948          * let the tx_thread send the response.
1949          *
1950          * For connection recovery, this is also the default action for
1951          * TMR TASK_REASSIGN.
1952          */
1953         if (sess_ref) {
1954                 pr_debug("Handle TMR, using sess_ref=true check\n");
1955                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1956         }
1957
1958         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1959         return 0;
1960 }
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1962
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1964 int
1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966                       struct iscsi_text *hdr)
1967 {
1968         u32 payload_length = ntoh24(hdr->dlength);
1969
1970         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1971                 pr_err("Unable to accept text parameter length: %u"
1972                         "greater than MaxXmitDataSegmentLength %u.\n",
1973                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1974                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1975                                          (unsigned char *)hdr);
1976         }
1977
1978         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1979              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1980                 pr_err("Multi sequence text commands currently not supported\n");
1981                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1982                                         (unsigned char *)hdr);
1983         }
1984
1985         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1987                 hdr->exp_statsn, payload_length);
1988
1989         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1990         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1991         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1992         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1993         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1994         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1995         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1996         cmd->data_direction     = DMA_NONE;
1997
1998         return 0;
1999 }
2000 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2001
2002 int
2003 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2004                         struct iscsi_text *hdr)
2005 {
2006         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2007         int cmdsn_ret;
2008
2009         if (!text_in) {
2010                 pr_err("Unable to locate text_in buffer for sendtargets"
2011                        " discovery\n");
2012                 goto reject;
2013         }
2014         if (strncmp("SendTargets", text_in, 11) != 0) {
2015                 pr_err("Received Text Data that is not"
2016                         " SendTargets, cannot continue.\n");
2017                 goto reject;
2018         }
2019         text_ptr = strchr(text_in, '=');
2020         if (!text_ptr) {
2021                 pr_err("No \"=\" separator found in Text Data,"
2022                         "  cannot continue.\n");
2023                 goto reject;
2024         }
2025         if (!strncmp("=All", text_ptr, 4)) {
2026                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2027         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2028                    !strncmp("=eui.", text_ptr, 5)) {
2029                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2030         } else {
2031                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2032                 goto reject;
2033         }
2034
2035         spin_lock_bh(&conn->cmd_lock);
2036         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2037         spin_unlock_bh(&conn->cmd_lock);
2038
2039         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2040
2041         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2042                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2043                                 (unsigned char *)hdr, hdr->cmdsn);
2044                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2045                         return -1;
2046
2047                 return 0;
2048         }
2049
2050         return iscsit_execute_cmd(cmd, 0);
2051
2052 reject:
2053         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2054                                  (unsigned char *)hdr);
2055 }
2056 EXPORT_SYMBOL(iscsit_process_text_cmd);
2057
2058 static int
2059 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2060                        unsigned char *buf)
2061 {
2062         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2063         char *text_in = NULL;
2064         u32 payload_length = ntoh24(hdr->dlength);
2065         int rx_size, rc;
2066
2067         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2068         if (rc < 0)
2069                 return 0;
2070
2071         rx_size = payload_length;
2072         if (payload_length) {
2073                 u32 checksum = 0, data_crc = 0;
2074                 u32 padding = 0, pad_bytes = 0;
2075                 int niov = 0, rx_got;
2076                 struct kvec iov[3];
2077
2078                 text_in = kzalloc(payload_length, GFP_KERNEL);
2079                 if (!text_in) {
2080                         pr_err("Unable to allocate memory for"
2081                                 " incoming text parameters\n");
2082                         goto reject;
2083                 }
2084                 cmd->text_in_ptr = text_in;
2085
2086                 memset(iov, 0, 3 * sizeof(struct kvec));
2087                 iov[niov].iov_base      = text_in;
2088                 iov[niov++].iov_len     = payload_length;
2089
2090                 padding = ((-payload_length) & 3);
2091                 if (padding != 0) {
2092                         iov[niov].iov_base = &pad_bytes;
2093                         iov[niov++].iov_len  = padding;
2094                         rx_size += padding;
2095                         pr_debug("Receiving %u additional bytes"
2096                                         " for padding.\n", padding);
2097                 }
2098                 if (conn->conn_ops->DataDigest) {
2099                         iov[niov].iov_base      = &checksum;
2100                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2101                         rx_size += ISCSI_CRC_LEN;
2102                 }
2103
2104                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2105                 if (rx_got != rx_size)
2106                         goto reject;
2107
2108                 if (conn->conn_ops->DataDigest) {
2109                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2110                                         text_in, payload_length,
2111                                         padding, (u8 *)&pad_bytes,
2112                                         (u8 *)&data_crc);
2113
2114                         if (checksum != data_crc) {
2115                                 pr_err("Text data CRC32C DataDigest"
2116                                         " 0x%08x does not match computed"
2117                                         " 0x%08x\n", checksum, data_crc);
2118                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2119                                         pr_err("Unable to recover from"
2120                                         " Text Data digest failure while in"
2121                                                 " ERL=0.\n");
2122                                         goto reject;
2123                                 } else {
2124                                         /*
2125                                          * Silently drop this PDU and let the
2126                                          * initiator plug the CmdSN gap.
2127                                          */
2128                                         pr_debug("Dropping Text"
2129                                         " Command CmdSN: 0x%08x due to"
2130                                         " DataCRC error.\n", hdr->cmdsn);
2131                                         kfree(text_in);
2132                                         return 0;
2133                                 }
2134                         } else {
2135                                 pr_debug("Got CRC32C DataDigest"
2136                                         " 0x%08x for %u bytes of text data.\n",
2137                                                 checksum, payload_length);
2138                         }
2139                 }
2140                 text_in[payload_length - 1] = '\0';
2141                 pr_debug("Successfully read %d bytes of text"
2142                                 " data.\n", payload_length);
2143         }
2144
2145         return iscsit_process_text_cmd(conn, cmd, hdr);
2146
2147 reject:
2148         kfree(cmd->text_in_ptr);
2149         cmd->text_in_ptr = NULL;
2150         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2151 }
2152 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2153
2154 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2155 {
2156         struct iscsi_conn *conn_p;
2157         struct iscsi_session *sess = conn->sess;
2158
2159         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2160                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2161
2162         atomic_set(&sess->session_logout, 1);
2163         atomic_set(&conn->conn_logout_remove, 1);
2164         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2165
2166         iscsit_inc_conn_usage_count(conn);
2167         iscsit_inc_session_usage_count(sess);
2168
2169         spin_lock_bh(&sess->conn_lock);
2170         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2171                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2172                         continue;
2173
2174                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2175                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2176         }
2177         spin_unlock_bh(&sess->conn_lock);
2178
2179         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2180
2181         return 0;
2182 }
2183
2184 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2185 {
2186         struct iscsi_conn *l_conn;
2187         struct iscsi_session *sess = conn->sess;
2188
2189         pr_debug("Received logout request CLOSECONNECTION for CID:"
2190                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2191
2192         /*
2193          * A Logout Request with a CLOSECONNECTION reason code for a CID
2194          * can arrive on a connection with a differing CID.
2195          */
2196         if (conn->cid == cmd->logout_cid) {
2197                 spin_lock_bh(&conn->state_lock);
2198                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2199                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2200
2201                 atomic_set(&conn->conn_logout_remove, 1);
2202                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2203                 iscsit_inc_conn_usage_count(conn);
2204
2205                 spin_unlock_bh(&conn->state_lock);
2206         } else {
2207                 /*
2208                  * Handle all different cid CLOSECONNECTION requests in
2209                  * iscsit_logout_post_handler_diffcid() as to give enough
2210                  * time for any non immediate command's CmdSN to be
2211                  * acknowledged on the connection in question.
2212                  *
2213                  * Here we simply make sure the CID is still around.
2214                  */
2215                 l_conn = iscsit_get_conn_from_cid(sess,
2216                                 cmd->logout_cid);
2217                 if (!l_conn) {
2218                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2219                         iscsit_add_cmd_to_response_queue(cmd, conn,
2220                                         cmd->i_state);
2221                         return 0;
2222                 }
2223
2224                 iscsit_dec_conn_usage_count(l_conn);
2225         }
2226
2227         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2228
2229         return 0;
2230 }
2231
2232 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2233 {
2234         struct iscsi_session *sess = conn->sess;
2235
2236         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2237                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2238
2239         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2240                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2241                         " while ERL!=2.\n");
2242                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2243                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2244                 return 0;
2245         }
2246
2247         if (conn->cid == cmd->logout_cid) {
2248                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2249                         " with CID: %hu on CID: %hu, implementation error.\n",
2250                                 cmd->logout_cid, conn->cid);
2251                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2252                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2253                 return 0;
2254         }
2255
2256         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2257
2258         return 0;
2259 }
2260
2261 int
2262 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2263                         unsigned char *buf)
2264 {
2265         int cmdsn_ret, logout_remove = 0;
2266         u8 reason_code = 0;
2267         struct iscsi_logout *hdr;
2268         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2269
2270         hdr                     = (struct iscsi_logout *) buf;
2271         reason_code             = (hdr->flags & 0x7f);
2272
2273         if (tiqn) {
2274                 spin_lock(&tiqn->logout_stats.lock);
2275                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2276                         tiqn->logout_stats.normal_logouts++;
2277                 else
2278                         tiqn->logout_stats.abnormal_logouts++;
2279                 spin_unlock(&tiqn->logout_stats.lock);
2280         }
2281
2282         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2283                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2284                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2285                 hdr->cid, conn->cid);
2286
2287         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2288                 pr_err("Received logout request on connection that"
2289                         " is not in logged in state, ignoring request.\n");
2290                 iscsit_free_cmd(cmd, false);
2291                 return 0;
2292         }
2293
2294         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2295         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2296         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2297         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2298         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2299         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2300         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2301         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2302         cmd->logout_reason      = reason_code;
2303         cmd->data_direction     = DMA_NONE;
2304
2305         /*
2306          * We need to sleep in these cases (by returning 1) until the Logout
2307          * Response gets sent in the tx thread.
2308          */
2309         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2310            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2311             be16_to_cpu(hdr->cid) == conn->cid))
2312                 logout_remove = 1;
2313
2314         spin_lock_bh(&conn->cmd_lock);
2315         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2316         spin_unlock_bh(&conn->cmd_lock);
2317
2318         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2319                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2320
2321         /*
2322          * Immediate commands are executed, well, immediately.
2323          * Non-Immediate Logout Commands are executed in CmdSN order.
2324          */
2325         if (cmd->immediate_cmd) {
2326                 int ret = iscsit_execute_cmd(cmd, 0);
2327
2328                 if (ret < 0)
2329                         return ret;
2330         } else {
2331                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2332                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2333                         logout_remove = 0;
2334                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2335                         return -1;
2336         }
2337
2338         return logout_remove;
2339 }
2340 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2341
2342 static int iscsit_handle_snack(
2343         struct iscsi_conn *conn,
2344         unsigned char *buf)
2345 {
2346         struct iscsi_snack *hdr;
2347
2348         hdr                     = (struct iscsi_snack *) buf;
2349         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2350
2351         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2352                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2353                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2354                         hdr->begrun, hdr->runlength, conn->cid);
2355
2356         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2357                 pr_err("Initiator sent SNACK request while in"
2358                         " ErrorRecoveryLevel=0.\n");
2359                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2360                                          buf);
2361         }
2362         /*
2363          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2364          * call from inside iscsi_send_recovery_datain_or_r2t().
2365          */
2366         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2367         case 0:
2368                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2369                         hdr->itt,
2370                         be32_to_cpu(hdr->ttt),
2371                         be32_to_cpu(hdr->begrun),
2372                         be32_to_cpu(hdr->runlength));
2373         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2374                 return iscsit_handle_status_snack(conn, hdr->itt,
2375                         be32_to_cpu(hdr->ttt),
2376                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2377         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2378                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2379                         be32_to_cpu(hdr->begrun),
2380                         be32_to_cpu(hdr->runlength));
2381         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2382                 /* FIXME: Support R-Data SNACK */
2383                 pr_err("R-Data SNACK Not Supported.\n");
2384                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2385                                          buf);
2386         default:
2387                 pr_err("Unknown SNACK type 0x%02x, protocol"
2388                         " error.\n", hdr->flags & 0x0f);
2389                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2390                                          buf);
2391         }
2392
2393         return 0;
2394 }
2395
2396 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2397 {
2398         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2399             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2400                 wait_for_completion_interruptible_timeout(
2401                                         &conn->rx_half_close_comp,
2402                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2403         }
2404 }
2405
2406 static int iscsit_handle_immediate_data(
2407         struct iscsi_cmd *cmd,
2408         struct iscsi_scsi_req *hdr,
2409         u32 length)
2410 {
2411         int iov_ret, rx_got = 0, rx_size = 0;
2412         u32 checksum, iov_count = 0, padding = 0;
2413         struct iscsi_conn *conn = cmd->conn;
2414         struct kvec *iov;
2415
2416         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2417         if (iov_ret < 0)
2418                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2419
2420         rx_size = length;
2421         iov_count = iov_ret;
2422         iov = &cmd->iov_data[0];
2423
2424         padding = ((-length) & 3);
2425         if (padding != 0) {
2426                 iov[iov_count].iov_base = cmd->pad_bytes;
2427                 iov[iov_count++].iov_len = padding;
2428                 rx_size += padding;
2429         }
2430
2431         if (conn->conn_ops->DataDigest) {
2432                 iov[iov_count].iov_base         = &checksum;
2433                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2434                 rx_size += ISCSI_CRC_LEN;
2435         }
2436
2437         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2438
2439         iscsit_unmap_iovec(cmd);
2440
2441         if (rx_got != rx_size) {
2442                 iscsit_rx_thread_wait_for_tcp(conn);
2443                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2444         }
2445
2446         if (conn->conn_ops->DataDigest) {
2447                 u32 data_crc;
2448
2449                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2450                                                     cmd->write_data_done, length, padding,
2451                                                     cmd->pad_bytes);
2452
2453                 if (checksum != data_crc) {
2454                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2455                                 " does not match computed 0x%08x\n", checksum,
2456                                 data_crc);
2457
2458                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2459                                 pr_err("Unable to recover from"
2460                                         " Immediate Data digest failure while"
2461                                         " in ERL=0.\n");
2462                                 iscsit_reject_cmd(cmd,
2463                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2464                                                 (unsigned char *)hdr);
2465                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2466                         } else {
2467                                 iscsit_reject_cmd(cmd,
2468                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2469                                                 (unsigned char *)hdr);
2470                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2471                         }
2472                 } else {
2473                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2474                                 " %u bytes of Immediate Data\n", checksum,
2475                                 length);
2476                 }
2477         }
2478
2479         cmd->write_data_done += length;
2480
2481         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2482                 spin_lock_bh(&cmd->istate_lock);
2483                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2484                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2485                 spin_unlock_bh(&cmd->istate_lock);
2486         }
2487
2488         return IMMEDIATE_DATA_NORMAL_OPERATION;
2489 }
2490
2491 /*
2492  *      Called with sess->conn_lock held.
2493  */
2494 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2495         with active network interface */
2496 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2497 {
2498         struct iscsi_cmd *cmd;
2499         struct iscsi_conn *conn_p;
2500         bool found = false;
2501
2502         /*
2503          * Only send a Asynchronous Message on connections whos network
2504          * interface is still functional.
2505          */
2506         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2507                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2508                         iscsit_inc_conn_usage_count(conn_p);
2509                         found = true;
2510                         break;
2511                 }
2512         }
2513
2514         if (!found)
2515                 return;
2516
2517         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2518         if (!cmd) {
2519                 iscsit_dec_conn_usage_count(conn_p);
2520                 return;
2521         }
2522
2523         cmd->logout_cid = conn->cid;
2524         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2525         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2526
2527         spin_lock_bh(&conn_p->cmd_lock);
2528         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2529         spin_unlock_bh(&conn_p->cmd_lock);
2530
2531         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2532         iscsit_dec_conn_usage_count(conn_p);
2533 }
2534
2535 static int iscsit_send_conn_drop_async_message(
2536         struct iscsi_cmd *cmd,
2537         struct iscsi_conn *conn)
2538 {
2539         struct iscsi_async *hdr;
2540
2541         cmd->tx_size = ISCSI_HDR_LEN;
2542         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2543
2544         hdr                     = (struct iscsi_async *) cmd->pdu;
2545         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2546         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2547         cmd->init_task_tag      = RESERVED_ITT;
2548         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2549         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2550         cmd->stat_sn            = conn->stat_sn++;
2551         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2552         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2553         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2554         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2555         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2556         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2557         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2558
2559         if (conn->conn_ops->HeaderDigest) {
2560                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2561
2562                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2563                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2564
2565                 cmd->tx_size += ISCSI_CRC_LEN;
2566                 pr_debug("Attaching CRC32C HeaderDigest to"
2567                         " Async Message 0x%08x\n", *header_digest);
2568         }
2569
2570         cmd->iov_misc[0].iov_base       = cmd->pdu;
2571         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2572         cmd->iov_misc_count             = 1;
2573
2574         pr_debug("Sending Connection Dropped Async Message StatSN:"
2575                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2576                         cmd->logout_cid, conn->cid);
2577         return 0;
2578 }
2579
2580 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2581 {
2582         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2583             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2584                 wait_for_completion_interruptible_timeout(
2585                                         &conn->tx_half_close_comp,
2586                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2587         }
2588 }
2589
2590 static void
2591 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2592                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2593                         bool set_statsn)
2594 {
2595         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2596         hdr->flags              = datain->flags;
2597         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2598                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2599                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2600                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2601                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2602                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2603                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604                 }
2605         }
2606         hton24(hdr->dlength, datain->length);
2607         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2608                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2609                                 (struct scsi_lun *)&hdr->lun);
2610         else
2611                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2612
2613         hdr->itt                = cmd->init_task_tag;
2614
2615         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2616                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2617         else
2618                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2619         if (set_statsn)
2620                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2621         else
2622                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2623
2624         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2625         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2626         hdr->datasn             = cpu_to_be32(datain->data_sn);
2627         hdr->offset             = cpu_to_be32(datain->offset);
2628
2629         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2630                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2631                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2632                 ntohl(hdr->offset), datain->length, conn->cid);
2633 }
2634
2635 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2636 {
2637         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2638         struct iscsi_datain datain;
2639         struct iscsi_datain_req *dr;
2640         struct kvec *iov;
2641         u32 iov_count = 0, tx_size = 0;
2642         int eodr = 0, ret, iov_ret;
2643         bool set_statsn = false;
2644
2645         memset(&datain, 0, sizeof(struct iscsi_datain));
2646         dr = iscsit_get_datain_values(cmd, &datain);
2647         if (!dr) {
2648                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2649                                 cmd->init_task_tag);
2650                 return -1;
2651         }
2652         /*
2653          * Be paranoid and double check the logic for now.
2654          */
2655         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2656                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2657                         " datain.length: %u exceeds cmd->data_length: %u\n",
2658                         cmd->init_task_tag, datain.offset, datain.length,
2659                         cmd->se_cmd.data_length);
2660                 return -1;
2661         }
2662
2663         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2664         /*
2665          * Special case for successfully execution w/ both DATAIN
2666          * and Sense Data.
2667          */
2668         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2669             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2670                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2671         else {
2672                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2673                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2674                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2675                         cmd->stat_sn = conn->stat_sn++;
2676                         set_statsn = true;
2677                 } else if (dr->dr_complete ==
2678                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2679                         set_statsn = true;
2680         }
2681
2682         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2683
2684         iov = &cmd->iov_data[0];
2685         iov[iov_count].iov_base = cmd->pdu;
2686         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2687         tx_size += ISCSI_HDR_LEN;
2688
2689         if (conn->conn_ops->HeaderDigest) {
2690                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2691
2692                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2693                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2694
2695                 iov[0].iov_len += ISCSI_CRC_LEN;
2696                 tx_size += ISCSI_CRC_LEN;
2697
2698                 pr_debug("Attaching CRC32 HeaderDigest"
2699                         " for DataIN PDU 0x%08x\n", *header_digest);
2700         }
2701
2702         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2703                                 datain.offset, datain.length);
2704         if (iov_ret < 0)
2705                 return -1;
2706
2707         iov_count += iov_ret;
2708         tx_size += datain.length;
2709
2710         cmd->padding = ((-datain.length) & 3);
2711         if (cmd->padding) {
2712                 iov[iov_count].iov_base         = cmd->pad_bytes;
2713                 iov[iov_count++].iov_len        = cmd->padding;
2714                 tx_size += cmd->padding;
2715
2716                 pr_debug("Attaching %u padding bytes\n",
2717                                 cmd->padding);
2718         }
2719         if (conn->conn_ops->DataDigest) {
2720                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2721                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2722
2723                 iov[iov_count].iov_base = &cmd->data_crc;
2724                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2725                 tx_size += ISCSI_CRC_LEN;
2726
2727                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2728                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2729         }
2730
2731         cmd->iov_data_count = iov_count;
2732         cmd->tx_size = tx_size;
2733
2734         /* sendpage is preferred but can't insert markers */
2735         if (!conn->conn_ops->IFMarker)
2736                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2737         else
2738                 ret = iscsit_send_tx_data(cmd, conn, 0);
2739
2740         iscsit_unmap_iovec(cmd);
2741
2742         if (ret < 0) {
2743                 iscsit_tx_thread_wait_for_tcp(conn);
2744                 return ret;
2745         }
2746
2747         if (dr->dr_complete) {
2748                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2749                                 2 : 1;
2750                 iscsit_free_datain_req(cmd, dr);
2751         }
2752
2753         return eodr;
2754 }
2755
2756 int
2757 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2758                         struct iscsi_logout_rsp *hdr)
2759 {
2760         struct iscsi_conn *logout_conn = NULL;
2761         struct iscsi_conn_recovery *cr = NULL;
2762         struct iscsi_session *sess = conn->sess;
2763         /*
2764          * The actual shutting down of Sessions and/or Connections
2765          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2766          * is done in scsi_logout_post_handler().
2767          */
2768         switch (cmd->logout_reason) {
2769         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2770                 pr_debug("iSCSI session logout successful, setting"
2771                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2772                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2773                 break;
2774         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2775                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2776                         break;
2777                 /*
2778                  * For CLOSECONNECTION logout requests carrying
2779                  * a matching logout CID -> local CID, the reference
2780                  * for the local CID will have been incremented in
2781                  * iscsi_logout_closeconnection().
2782                  *
2783                  * For CLOSECONNECTION logout requests carrying
2784                  * a different CID than the connection it arrived
2785                  * on, the connection responding to cmd->logout_cid
2786                  * is stopped in iscsit_logout_post_handler_diffcid().
2787                  */
2788
2789                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2790                         " successful.\n", cmd->logout_cid, conn->cid);
2791                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2792                 break;
2793         case ISCSI_LOGOUT_REASON_RECOVERY:
2794                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2795                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2796                         break;
2797                 /*
2798                  * If the connection is still active from our point of view
2799                  * force connection recovery to occur.
2800                  */
2801                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2802                                 cmd->logout_cid);
2803                 if (logout_conn) {
2804                         iscsit_connection_reinstatement_rcfr(logout_conn);
2805                         iscsit_dec_conn_usage_count(logout_conn);
2806                 }
2807
2808                 cr = iscsit_get_inactive_connection_recovery_entry(
2809                                 conn->sess, cmd->logout_cid);
2810                 if (!cr) {
2811                         pr_err("Unable to locate CID: %hu for"
2812                         " REMOVECONNFORRECOVERY Logout Request.\n",
2813                                 cmd->logout_cid);
2814                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2815                         break;
2816                 }
2817
2818                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2819
2820                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2821                         " for recovery for CID: %hu on CID: %hu successful.\n",
2822                                 cmd->logout_cid, conn->cid);
2823                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2824                 break;
2825         default:
2826                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2827                                 cmd->logout_reason);
2828                 return -1;
2829         }
2830
2831         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2832         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2833         hdr->response           = cmd->logout_response;
2834         hdr->itt                = cmd->init_task_tag;
2835         cmd->stat_sn            = conn->stat_sn++;
2836         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2837
2838         iscsit_increment_maxcmdsn(cmd, conn->sess);
2839         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2840         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2841
2842         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2843                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2844                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2845                 cmd->logout_cid, conn->cid);
2846
2847         return 0;
2848 }
2849 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2850
2851 static int
2852 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2853 {
2854         struct kvec *iov;
2855         int niov = 0, tx_size, rc;
2856
2857         rc = iscsit_build_logout_rsp(cmd, conn,
2858                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2859         if (rc < 0)
2860                 return rc;
2861
2862         tx_size = ISCSI_HDR_LEN;
2863         iov = &cmd->iov_misc[0];
2864         iov[niov].iov_base      = cmd->pdu;
2865         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2866
2867         if (conn->conn_ops->HeaderDigest) {
2868                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2869
2870                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2871                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2872
2873                 iov[0].iov_len += ISCSI_CRC_LEN;
2874                 tx_size += ISCSI_CRC_LEN;
2875                 pr_debug("Attaching CRC32C HeaderDigest to"
2876                         " Logout Response 0x%08x\n", *header_digest);
2877         }
2878         cmd->iov_misc_count = niov;
2879         cmd->tx_size = tx_size;
2880
2881         return 0;
2882 }
2883
2884 void
2885 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2886                        struct iscsi_nopin *hdr, bool nopout_response)
2887 {
2888         hdr->opcode             = ISCSI_OP_NOOP_IN;
2889         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2890         hton24(hdr->dlength, cmd->buf_ptr_size);
2891         if (nopout_response)
2892                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2893         hdr->itt                = cmd->init_task_tag;
2894         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2895         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2896                                   conn->stat_sn;
2897         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2898
2899         if (nopout_response)
2900                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2901
2902         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2903         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2904
2905         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2906                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2907                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2908                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2909 }
2910 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2911
2912 /*
2913  *      Unsolicited NOPIN, either requesting a response or not.
2914  */
2915 static int iscsit_send_unsolicited_nopin(
2916         struct iscsi_cmd *cmd,
2917         struct iscsi_conn *conn,
2918         int want_response)
2919 {
2920         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2921         int tx_size = ISCSI_HDR_LEN, ret;
2922
2923         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2924
2925         if (conn->conn_ops->HeaderDigest) {
2926                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2927
2928                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2929                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2930
2931                 tx_size += ISCSI_CRC_LEN;
2932                 pr_debug("Attaching CRC32C HeaderDigest to"
2933                         " NopIN 0x%08x\n", *header_digest);
2934         }
2935
2936         cmd->iov_misc[0].iov_base       = cmd->pdu;
2937         cmd->iov_misc[0].iov_len        = tx_size;
2938         cmd->iov_misc_count     = 1;
2939         cmd->tx_size            = tx_size;
2940
2941         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2942                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2943
2944         ret = iscsit_send_tx_data(cmd, conn, 1);
2945         if (ret < 0) {
2946                 iscsit_tx_thread_wait_for_tcp(conn);
2947                 return ret;
2948         }
2949
2950         spin_lock_bh(&cmd->istate_lock);
2951         cmd->i_state = want_response ?
2952                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2953         spin_unlock_bh(&cmd->istate_lock);
2954
2955         return 0;
2956 }
2957
2958 static int
2959 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2960 {
2961         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2962         struct kvec *iov;
2963         u32 padding = 0;
2964         int niov = 0, tx_size;
2965
2966         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2967
2968         tx_size = ISCSI_HDR_LEN;
2969         iov = &cmd->iov_misc[0];
2970         iov[niov].iov_base      = cmd->pdu;
2971         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2972
2973         if (conn->conn_ops->HeaderDigest) {
2974                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2975
2976                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2977                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2978
2979                 iov[0].iov_len += ISCSI_CRC_LEN;
2980                 tx_size += ISCSI_CRC_LEN;
2981                 pr_debug("Attaching CRC32C HeaderDigest"
2982                         " to NopIn 0x%08x\n", *header_digest);
2983         }
2984
2985         /*
2986          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2987          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2988          */
2989         if (cmd->buf_ptr_size) {
2990                 iov[niov].iov_base      = cmd->buf_ptr;
2991                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2992                 tx_size += cmd->buf_ptr_size;
2993
2994                 pr_debug("Echoing back %u bytes of ping"
2995                         " data.\n", cmd->buf_ptr_size);
2996
2997                 padding = ((-cmd->buf_ptr_size) & 3);
2998                 if (padding != 0) {
2999                         iov[niov].iov_base = &cmd->pad_bytes;
3000                         iov[niov++].iov_len = padding;
3001                         tx_size += padding;
3002                         pr_debug("Attaching %u additional"
3003                                 " padding bytes.\n", padding);
3004                 }
3005                 if (conn->conn_ops->DataDigest) {
3006                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3007                                 cmd->buf_ptr, cmd->buf_ptr_size,
3008                                 padding, (u8 *)&cmd->pad_bytes,
3009                                 (u8 *)&cmd->data_crc);
3010
3011                         iov[niov].iov_base = &cmd->data_crc;
3012                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3013                         tx_size += ISCSI_CRC_LEN;
3014                         pr_debug("Attached DataDigest for %u"
3015                                 " bytes of ping data, CRC 0x%08x\n",
3016                                 cmd->buf_ptr_size, cmd->data_crc);
3017                 }
3018         }
3019
3020         cmd->iov_misc_count = niov;
3021         cmd->tx_size = tx_size;
3022
3023         return 0;
3024 }
3025
3026 static int iscsit_send_r2t(
3027         struct iscsi_cmd *cmd,
3028         struct iscsi_conn *conn)
3029 {
3030         int tx_size = 0;
3031         struct iscsi_r2t *r2t;
3032         struct iscsi_r2t_rsp *hdr;
3033         int ret;
3034
3035         r2t = iscsit_get_r2t_from_list(cmd);
3036         if (!r2t)
3037                 return -1;
3038
3039         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3040         memset(hdr, 0, ISCSI_HDR_LEN);
3041         hdr->opcode             = ISCSI_OP_R2T;
3042         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3043         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3044                         (struct scsi_lun *)&hdr->lun);
3045         hdr->itt                = cmd->init_task_tag;
3046         spin_lock_bh(&conn->sess->ttt_lock);
3047         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3048         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3049                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3050         spin_unlock_bh(&conn->sess->ttt_lock);
3051         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3052         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3053         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3054         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3055         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3056         hdr->data_offset        = cpu_to_be32(r2t->offset);
3057         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3058
3059         cmd->iov_misc[0].iov_base       = cmd->pdu;
3060         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3061         tx_size += ISCSI_HDR_LEN;
3062
3063         if (conn->conn_ops->HeaderDigest) {
3064                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3065
3066                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3067                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3068
3069                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3070                 tx_size += ISCSI_CRC_LEN;
3071                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3072                         " PDU 0x%08x\n", *header_digest);
3073         }
3074
3075         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3076                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3077                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3078                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3079                         r2t->offset, r2t->xfer_len, conn->cid);
3080
3081         cmd->iov_misc_count = 1;
3082         cmd->tx_size = tx_size;
3083
3084         spin_lock_bh(&cmd->r2t_lock);
3085         r2t->sent_r2t = 1;
3086         spin_unlock_bh(&cmd->r2t_lock);
3087
3088         ret = iscsit_send_tx_data(cmd, conn, 1);
3089         if (ret < 0) {
3090                 iscsit_tx_thread_wait_for_tcp(conn);
3091                 return ret;
3092         }
3093
3094         spin_lock_bh(&cmd->dataout_timeout_lock);
3095         iscsit_start_dataout_timer(cmd, conn);
3096         spin_unlock_bh(&cmd->dataout_timeout_lock);
3097
3098         return 0;
3099 }
3100
3101 /*
3102  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3103  *              connection recovery.
3104  */
3105 int iscsit_build_r2ts_for_cmd(
3106         struct iscsi_conn *conn,
3107         struct iscsi_cmd *cmd,
3108         bool recovery)
3109 {
3110         int first_r2t = 1;
3111         u32 offset = 0, xfer_len = 0;
3112
3113         spin_lock_bh(&cmd->r2t_lock);
3114         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3115                 spin_unlock_bh(&cmd->r2t_lock);
3116                 return 0;
3117         }
3118
3119         if (conn->sess->sess_ops->DataSequenceInOrder &&
3120             !recovery)
3121                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3122
3123         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3124                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3125                         offset = cmd->r2t_offset;
3126
3127                         if (first_r2t && recovery) {
3128                                 int new_data_end = offset +
3129                                         conn->sess->sess_ops->MaxBurstLength -
3130                                         cmd->next_burst_len;
3131
3132                                 if (new_data_end > cmd->se_cmd.data_length)
3133                                         xfer_len = cmd->se_cmd.data_length - offset;
3134                                 else
3135                                         xfer_len =
3136                                                 conn->sess->sess_ops->MaxBurstLength -
3137                                                 cmd->next_burst_len;
3138                         } else {
3139                                 int new_data_end = offset +
3140                                         conn->sess->sess_ops->MaxBurstLength;
3141
3142                                 if (new_data_end > cmd->se_cmd.data_length)
3143                                         xfer_len = cmd->se_cmd.data_length - offset;
3144                                 else
3145                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3146                         }
3147                         cmd->r2t_offset += xfer_len;
3148
3149                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3150                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151                 } else {
3152                         struct iscsi_seq *seq;
3153
3154                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3155                         if (!seq) {
3156                                 spin_unlock_bh(&cmd->r2t_lock);
3157                                 return -1;
3158                         }
3159
3160                         offset = seq->offset;
3161                         xfer_len = seq->xfer_len;
3162
3163                         if (cmd->seq_send_order == cmd->seq_count)
3164                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3165                 }
3166                 cmd->outstanding_r2ts++;
3167                 first_r2t = 0;
3168
3169                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3170                         spin_unlock_bh(&cmd->r2t_lock);
3171                         return -1;
3172                 }
3173
3174                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3175                         break;
3176         }
3177         spin_unlock_bh(&cmd->r2t_lock);
3178
3179         return 0;
3180 }
3181
3182 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3183                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3184 {
3185         if (inc_stat_sn)
3186                 cmd->stat_sn = conn->stat_sn++;
3187
3188         atomic_long_inc(&conn->sess->rsp_pdus);
3189
3190         memset(hdr, 0, ISCSI_HDR_LEN);
3191         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3192         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3193         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3194                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3195                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3196         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3197                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3198                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3199         }
3200         hdr->response           = cmd->iscsi_response;
3201         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3202         hdr->itt                = cmd->init_task_tag;
3203         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3204
3205         iscsit_increment_maxcmdsn(cmd, conn->sess);
3206         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3207         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3208
3209         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3210                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3211                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3212                 cmd->se_cmd.scsi_status, conn->cid);
3213 }
3214 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3215
3216 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3217 {
3218         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3219         struct kvec *iov;
3220         u32 padding = 0, tx_size = 0;
3221         int iov_count = 0;
3222         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3223
3224         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3225
3226         iov = &cmd->iov_misc[0];
3227         iov[iov_count].iov_base = cmd->pdu;
3228         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3229         tx_size += ISCSI_HDR_LEN;
3230
3231         /*
3232          * Attach SENSE DATA payload to iSCSI Response PDU
3233          */
3234         if (cmd->se_cmd.sense_buffer &&
3235            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3236             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3237                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3238                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3239
3240                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3241                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3242                 iov[iov_count].iov_base = cmd->sense_buffer;
3243                 iov[iov_count++].iov_len =
3244                                 (cmd->se_cmd.scsi_sense_length + padding);
3245                 tx_size += cmd->se_cmd.scsi_sense_length;
3246
3247                 if (padding) {
3248                         memset(cmd->sense_buffer +
3249                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3250                         tx_size += padding;
3251                         pr_debug("Adding %u bytes of padding to"
3252                                 " SENSE.\n", padding);
3253                 }
3254
3255                 if (conn->conn_ops->DataDigest) {
3256                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3257                                 cmd->sense_buffer,
3258                                 (cmd->se_cmd.scsi_sense_length + padding),
3259                                 0, NULL, (u8 *)&cmd->data_crc);
3260
3261                         iov[iov_count].iov_base    = &cmd->data_crc;
3262                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3263                         tx_size += ISCSI_CRC_LEN;
3264
3265                         pr_debug("Attaching CRC32 DataDigest for"
3266                                 " SENSE, %u bytes CRC 0x%08x\n",
3267                                 (cmd->se_cmd.scsi_sense_length + padding),
3268                                 cmd->data_crc);
3269                 }
3270
3271                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3272                                 " Response PDU\n",
3273                                 cmd->se_cmd.scsi_sense_length);
3274         }
3275
3276         if (conn->conn_ops->HeaderDigest) {
3277                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3278
3279                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3280                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3281
3282                 iov[0].iov_len += ISCSI_CRC_LEN;
3283                 tx_size += ISCSI_CRC_LEN;
3284                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3285                                 " PDU 0x%08x\n", *header_digest);
3286         }
3287
3288         cmd->iov_misc_count = iov_count;
3289         cmd->tx_size = tx_size;
3290
3291         return 0;
3292 }
3293
3294 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3295 {
3296         switch (se_tmr->response) {
3297         case TMR_FUNCTION_COMPLETE:
3298                 return ISCSI_TMF_RSP_COMPLETE;
3299         case TMR_TASK_DOES_NOT_EXIST:
3300                 return ISCSI_TMF_RSP_NO_TASK;
3301         case TMR_LUN_DOES_NOT_EXIST:
3302                 return ISCSI_TMF_RSP_NO_LUN;
3303         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3304                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3305         case TMR_FUNCTION_REJECTED:
3306         default:
3307                 return ISCSI_TMF_RSP_REJECTED;
3308         }
3309 }
3310
3311 void
3312 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3313                           struct iscsi_tm_rsp *hdr)
3314 {
3315         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3316
3317         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3318         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3319         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3320         hdr->itt                = cmd->init_task_tag;
3321         cmd->stat_sn            = conn->stat_sn++;
3322         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3323
3324         iscsit_increment_maxcmdsn(cmd, conn->sess);
3325         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3326         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3327
3328         pr_debug("Built Task Management Response ITT: 0x%08x,"
3329                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3330                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3331 }
3332 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3333
3334 static int
3335 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3336 {
3337         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3338         u32 tx_size = 0;
3339
3340         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3341
3342         cmd->iov_misc[0].iov_base       = cmd->pdu;
3343         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3344         tx_size += ISCSI_HDR_LEN;
3345
3346         if (conn->conn_ops->HeaderDigest) {
3347                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3348
3349                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3350                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3351
3352                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3353                 tx_size += ISCSI_CRC_LEN;
3354                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3355                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3356         }
3357
3358         cmd->iov_misc_count = 1;
3359         cmd->tx_size = tx_size;
3360
3361         return 0;
3362 }
3363
3364 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3365 {
3366         bool ret = false;
3367
3368         if (np->np_sockaddr.ss_family == AF_INET6) {
3369                 const struct sockaddr_in6 sin6 = {
3370                         .sin6_addr = IN6ADDR_ANY_INIT };
3371                 struct sockaddr_in6 *sock_in6 =
3372                          (struct sockaddr_in6 *)&np->np_sockaddr;
3373
3374                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3375                                 sin6.sin6_addr.s6_addr, 16))
3376                         ret = true;
3377         } else {
3378                 struct sockaddr_in * sock_in =
3379                         (struct sockaddr_in *)&np->np_sockaddr;
3380
3381                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3382                         ret = true;
3383         }
3384
3385         return ret;
3386 }
3387
3388 #define SENDTARGETS_BUF_LIMIT 32768U
3389
3390 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3391 {
3392         char *payload = NULL;
3393         struct iscsi_conn *conn = cmd->conn;
3394         struct iscsi_portal_group *tpg;
3395         struct iscsi_tiqn *tiqn;
3396         struct iscsi_tpg_np *tpg_np;
3397         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3398         int target_name_printed;
3399         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3400         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3401
3402         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3403                          SENDTARGETS_BUF_LIMIT);
3404
3405         payload = kzalloc(buffer_len, GFP_KERNEL);
3406         if (!payload) {
3407                 pr_err("Unable to allocate memory for sendtargets"
3408                                 " response.\n");
3409                 return -ENOMEM;
3410         }
3411         /*
3412          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3413          * explicit case..
3414          */
3415         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3416                 text_ptr = strchr(text_in, '=');
3417                 if (!text_ptr) {
3418                         pr_err("Unable to locate '=' string in text_in:"
3419                                " %s\n", text_in);
3420                         kfree(payload);
3421                         return -EINVAL;
3422                 }
3423                 /*
3424                  * Skip over '=' character..
3425                  */
3426                 text_ptr += 1;
3427         }
3428
3429         spin_lock(&tiqn_lock);
3430         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3431                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3432                      strcmp(tiqn->tiqn, text_ptr)) {
3433                         continue;
3434                 }
3435
3436                 target_name_printed = 0;
3437
3438                 spin_lock(&tiqn->tiqn_tpg_lock);
3439                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3440
3441                         /* If demo_mode_discovery=0 and generate_node_acls=0
3442                          * (demo mode dislabed) do not return
3443                          * TargetName+TargetAddress unless a NodeACL exists.
3444                          */
3445
3446                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3447                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3448                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3449                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3450                                 continue;
3451                         }
3452
3453                         spin_lock(&tpg->tpg_state_lock);
3454                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3455                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3456                                 spin_unlock(&tpg->tpg_state_lock);
3457                                 continue;
3458                         }
3459                         spin_unlock(&tpg->tpg_state_lock);
3460
3461                         spin_lock(&tpg->tpg_np_lock);
3462                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3463                                                 tpg_np_list) {
3464                                 struct iscsi_np *np = tpg_np->tpg_np;
3465                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3466
3467                                 if (!target_name_printed) {
3468                                         len = sprintf(buf, "TargetName=%s",
3469                                                       tiqn->tiqn);
3470                                         len += 1;
3471
3472                                         if ((len + payload_len) > buffer_len) {
3473                                                 spin_unlock(&tpg->tpg_np_lock);
3474                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3475                                                 end_of_buf = 1;
3476                                                 goto eob;
3477                                         }
3478                                         memcpy(payload + payload_len, buf, len);
3479                                         payload_len += len;
3480                                         target_name_printed = 1;
3481                                 }
3482
3483                                 len = sprintf(buf, "TargetAddress="
3484                                         "%s:%hu,%hu",
3485                                         (inaddr_any == false) ?
3486                                                 np->np_ip : conn->local_ip,
3487                                         (inaddr_any == false) ?
3488                                                 np->np_port : conn->local_port,
3489                                         tpg->tpgt);
3490                                 len += 1;
3491
3492                                 if ((len + payload_len) > buffer_len) {
3493                                         spin_unlock(&tpg->tpg_np_lock);
3494                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3495                                         end_of_buf = 1;
3496                                         goto eob;
3497                                 }
3498                                 memcpy(payload + payload_len, buf, len);
3499                                 payload_len += len;
3500                         }
3501                         spin_unlock(&tpg->tpg_np_lock);
3502                 }
3503                 spin_unlock(&tiqn->tiqn_tpg_lock);
3504 eob:
3505                 if (end_of_buf)
3506                         break;
3507
3508                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3509                         break;
3510         }
3511         spin_unlock(&tiqn_lock);
3512
3513         cmd->buf_ptr = payload;
3514
3515         return payload_len;
3516 }
3517
3518 int
3519 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3520                       struct iscsi_text_rsp *hdr)
3521 {
3522         int text_length, padding;
3523
3524         text_length = iscsit_build_sendtargets_response(cmd);
3525         if (text_length < 0)
3526                 return text_length;
3527
3528         hdr->opcode = ISCSI_OP_TEXT_RSP;
3529         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3530         padding = ((-text_length) & 3);
3531         hton24(hdr->dlength, text_length);
3532         hdr->itt = cmd->init_task_tag;
3533         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3534         cmd->stat_sn = conn->stat_sn++;
3535         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3536
3537         iscsit_increment_maxcmdsn(cmd, conn->sess);
3538         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3539         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3540
3541         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3542                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3543                 text_length, conn->cid);
3544
3545         return text_length + padding;
3546 }
3547 EXPORT_SYMBOL(iscsit_build_text_rsp);
3548
3549 /*
3550  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3551  *      MaxRecvDataSegmentLength.
3552  */
3553 static int iscsit_send_text_rsp(
3554         struct iscsi_cmd *cmd,
3555         struct iscsi_conn *conn)
3556 {
3557         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3558         struct kvec *iov;
3559         u32 tx_size = 0;
3560         int text_length, iov_count = 0, rc;
3561
3562         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3563         if (rc < 0)
3564                 return rc;
3565
3566         text_length = rc;
3567         iov = &cmd->iov_misc[0];
3568         iov[iov_count].iov_base = cmd->pdu;
3569         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3570         iov[iov_count].iov_base = cmd->buf_ptr;
3571         iov[iov_count++].iov_len = text_length;
3572
3573         tx_size += (ISCSI_HDR_LEN + text_length);
3574
3575         if (conn->conn_ops->HeaderDigest) {
3576                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3577
3578                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3579                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3580
3581                 iov[0].iov_len += ISCSI_CRC_LEN;
3582                 tx_size += ISCSI_CRC_LEN;
3583                 pr_debug("Attaching CRC32 HeaderDigest for"
3584                         " Text Response PDU 0x%08x\n", *header_digest);
3585         }
3586
3587         if (conn->conn_ops->DataDigest) {
3588                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3589                                 cmd->buf_ptr, text_length,
3590                                 0, NULL, (u8 *)&cmd->data_crc);
3591
3592                 iov[iov_count].iov_base = &cmd->data_crc;
3593                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3594                 tx_size += ISCSI_CRC_LEN;
3595
3596                 pr_debug("Attaching DataDigest for %u bytes of text"
3597                         " data, CRC 0x%08x\n", text_length,
3598                         cmd->data_crc);
3599         }
3600
3601         cmd->iov_misc_count = iov_count;
3602         cmd->tx_size = tx_size;
3603
3604         return 0;
3605 }
3606
3607 void
3608 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3609                     struct iscsi_reject *hdr)
3610 {
3611         hdr->opcode             = ISCSI_OP_REJECT;
3612         hdr->reason             = cmd->reject_reason;
3613         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3614         hton24(hdr->dlength, ISCSI_HDR_LEN);
3615         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3616         cmd->stat_sn            = conn->stat_sn++;
3617         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3618         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3619         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3620
3621 }
3622 EXPORT_SYMBOL(iscsit_build_reject);
3623
3624 static int iscsit_send_reject(
3625         struct iscsi_cmd *cmd,
3626         struct iscsi_conn *conn)
3627 {
3628         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3629         struct kvec *iov;
3630         u32 iov_count = 0, tx_size;
3631
3632         iscsit_build_reject(cmd, conn, hdr);
3633
3634         iov = &cmd->iov_misc[0];
3635         iov[iov_count].iov_base = cmd->pdu;
3636         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3637         iov[iov_count].iov_base = cmd->buf_ptr;
3638         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3639
3640         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3641
3642         if (conn->conn_ops->HeaderDigest) {
3643                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3644
3645                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3646                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3647
3648                 iov[0].iov_len += ISCSI_CRC_LEN;
3649                 tx_size += ISCSI_CRC_LEN;
3650                 pr_debug("Attaching CRC32 HeaderDigest for"
3651                         " REJECT PDU 0x%08x\n", *header_digest);
3652         }
3653
3654         if (conn->conn_ops->DataDigest) {
3655                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3656                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3657
3658                 iov[iov_count].iov_base = &cmd->data_crc;
3659                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3660                 tx_size += ISCSI_CRC_LEN;
3661                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3662                                 " PDU 0x%08x\n", cmd->data_crc);
3663         }
3664
3665         cmd->iov_misc_count = iov_count;
3666         cmd->tx_size = tx_size;
3667
3668         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3669                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3670
3671         return 0;
3672 }
3673
3674 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3675 {
3676         struct iscsi_thread_set *ts = conn->thread_set;
3677         int ord, cpu;
3678         /*
3679          * thread_id is assigned from iscsit_global->ts_bitmap from
3680          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3681          *
3682          * Here we use thread_id to determine which CPU that this
3683          * iSCSI connection's iscsi_thread_set will be scheduled to
3684          * execute upon.
3685          */
3686         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3687         for_each_online_cpu(cpu) {
3688                 if (ord-- == 0) {
3689                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3690                         return;
3691                 }
3692         }
3693         /*
3694          * This should never be reached..
3695          */
3696         dump_stack();
3697         cpumask_setall(conn->conn_cpumask);
3698 }
3699
3700 static inline void iscsit_thread_check_cpumask(
3701         struct iscsi_conn *conn,
3702         struct task_struct *p,
3703         int mode)
3704 {
3705         char buf[128];
3706         /*
3707          * mode == 1 signals iscsi_target_tx_thread() usage.
3708          * mode == 0 signals iscsi_target_rx_thread() usage.
3709          */
3710         if (mode == 1) {
3711                 if (!conn->conn_tx_reset_cpumask)
3712                         return;
3713                 conn->conn_tx_reset_cpumask = 0;
3714         } else {
3715                 if (!conn->conn_rx_reset_cpumask)
3716                         return;
3717                 conn->conn_rx_reset_cpumask = 0;
3718         }
3719         /*
3720          * Update the CPU mask for this single kthread so that
3721          * both TX and RX kthreads are scheduled to run on the
3722          * same CPU.
3723          */
3724         memset(buf, 0, 128);
3725         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3726         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3727 }
3728
3729 static int
3730 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3731 {
3732         int ret;
3733
3734         switch (state) {
3735         case ISTATE_SEND_R2T:
3736                 ret = iscsit_send_r2t(cmd, conn);
3737                 if (ret < 0)
3738                         goto err;
3739                 break;
3740         case ISTATE_REMOVE:
3741                 spin_lock_bh(&conn->cmd_lock);
3742                 list_del_init(&cmd->i_conn_node);
3743                 spin_unlock_bh(&conn->cmd_lock);
3744
3745                 iscsit_free_cmd(cmd, false);
3746                 break;
3747         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3748                 iscsit_mod_nopin_response_timer(conn);
3749                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3750                 if (ret < 0)
3751                         goto err;
3752                 break;
3753         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3754                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3755                 if (ret < 0)
3756                         goto err;
3757                 break;
3758         default:
3759                 pr_err("Unknown Opcode: 0x%02x ITT:"
3760                        " 0x%08x, i_state: %d on CID: %hu\n",
3761                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3762                        conn->cid);
3763                 goto err;
3764         }
3765
3766         return 0;
3767
3768 err:
3769         return -1;
3770 }
3771
3772 static int
3773 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3774 {
3775         struct iscsit_transport *t = conn->conn_transport;
3776         struct iscsi_queue_req *qr;
3777         struct iscsi_cmd *cmd;
3778         u8 state;
3779         int ret;
3780
3781         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3782                 atomic_set(&conn->check_immediate_queue, 0);
3783                 cmd = qr->cmd;
3784                 state = qr->state;
3785                 kmem_cache_free(lio_qr_cache, qr);
3786
3787                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3788                 if (ret < 0)
3789                         return ret;
3790         }
3791
3792         return 0;
3793 }
3794
3795 static int
3796 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3797 {
3798         int ret;
3799
3800 check_rsp_state:
3801         switch (state) {
3802         case ISTATE_SEND_DATAIN:
3803                 ret = iscsit_send_datain(cmd, conn);
3804                 if (ret < 0)
3805                         goto err;
3806                 else if (!ret)
3807                         /* more drs */
3808                         goto check_rsp_state;
3809                 else if (ret == 1) {
3810                         /* all done */
3811                         spin_lock_bh(&cmd->istate_lock);
3812                         cmd->i_state = ISTATE_SENT_STATUS;
3813                         spin_unlock_bh(&cmd->istate_lock);
3814
3815                         if (atomic_read(&conn->check_immediate_queue))
3816                                 return 1;
3817
3818                         return 0;
3819                 } else if (ret == 2) {
3820                         /* Still must send status,
3821                            SCF_TRANSPORT_TASK_SENSE was set */
3822                         spin_lock_bh(&cmd->istate_lock);
3823                         cmd->i_state = ISTATE_SEND_STATUS;
3824                         spin_unlock_bh(&cmd->istate_lock);
3825                         state = ISTATE_SEND_STATUS;
3826                         goto check_rsp_state;
3827                 }
3828
3829                 break;
3830         case ISTATE_SEND_STATUS:
3831         case ISTATE_SEND_STATUS_RECOVERY:
3832                 ret = iscsit_send_response(cmd, conn);
3833                 break;
3834         case ISTATE_SEND_LOGOUTRSP:
3835                 ret = iscsit_send_logout(cmd, conn);
3836                 break;
3837         case ISTATE_SEND_ASYNCMSG:
3838                 ret = iscsit_send_conn_drop_async_message(
3839                         cmd, conn);
3840                 break;
3841         case ISTATE_SEND_NOPIN:
3842                 ret = iscsit_send_nopin(cmd, conn);
3843                 break;
3844         case ISTATE_SEND_REJECT:
3845                 ret = iscsit_send_reject(cmd, conn);
3846                 break;
3847         case ISTATE_SEND_TASKMGTRSP:
3848                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3849                 if (ret != 0)
3850                         break;
3851                 ret = iscsit_tmr_post_handler(cmd, conn);
3852                 if (ret != 0)
3853                         iscsit_fall_back_to_erl0(conn->sess);
3854                 break;
3855         case ISTATE_SEND_TEXTRSP:
3856                 ret = iscsit_send_text_rsp(cmd, conn);
3857                 break;
3858         default:
3859                 pr_err("Unknown Opcode: 0x%02x ITT:"
3860                        " 0x%08x, i_state: %d on CID: %hu\n",
3861                        cmd->iscsi_opcode, cmd->init_task_tag,
3862                        state, conn->cid);
3863                 goto err;
3864         }
3865         if (ret < 0)
3866                 goto err;
3867
3868         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3869                 iscsit_tx_thread_wait_for_tcp(conn);
3870                 iscsit_unmap_iovec(cmd);
3871                 goto err;
3872         }
3873         iscsit_unmap_iovec(cmd);
3874
3875         switch (state) {
3876         case ISTATE_SEND_LOGOUTRSP:
3877                 if (!iscsit_logout_post_handler(cmd, conn))
3878                         goto restart;
3879                 /* fall through */
3880         case ISTATE_SEND_STATUS:
3881         case ISTATE_SEND_ASYNCMSG:
3882         case ISTATE_SEND_NOPIN:
3883         case ISTATE_SEND_STATUS_RECOVERY:
3884         case ISTATE_SEND_TEXTRSP:
3885         case ISTATE_SEND_TASKMGTRSP:
3886         case ISTATE_SEND_REJECT:
3887                 spin_lock_bh(&cmd->istate_lock);
3888                 cmd->i_state = ISTATE_SENT_STATUS;
3889                 spin_unlock_bh(&cmd->istate_lock);
3890                 break;
3891         default:
3892                 pr_err("Unknown Opcode: 0x%02x ITT:"
3893                        " 0x%08x, i_state: %d on CID: %hu\n",
3894                        cmd->iscsi_opcode, cmd->init_task_tag,
3895                        cmd->i_state, conn->cid);
3896                 goto err;
3897         }
3898
3899         if (atomic_read(&conn->check_immediate_queue))
3900                 return 1;
3901
3902         return 0;
3903
3904 err:
3905         return -1;
3906 restart:
3907         return -EAGAIN;
3908 }
3909
3910 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3911 {
3912         struct iscsit_transport *t = conn->conn_transport;
3913         struct iscsi_queue_req *qr;
3914         struct iscsi_cmd *cmd;
3915         u8 state;
3916         int ret;
3917
3918         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3919                 cmd = qr->cmd;
3920                 state = qr->state;
3921                 kmem_cache_free(lio_qr_cache, qr);
3922
3923                 ret = t->iscsit_response_queue(conn, cmd, state);
3924                 if (ret == 1 || ret < 0)
3925                         return ret;
3926         }
3927
3928         return 0;
3929 }
3930
3931 int iscsi_target_tx_thread(void *arg)
3932 {
3933         int ret = 0;
3934         struct iscsi_conn *conn;
3935         struct iscsi_thread_set *ts = arg;
3936         /*
3937          * Allow ourselves to be interrupted by SIGINT so that a
3938          * connection recovery / failure event can be triggered externally.
3939          */
3940         allow_signal(SIGINT);
3941
3942 restart:
3943         conn = iscsi_tx_thread_pre_handler(ts);
3944         if (!conn)
3945                 goto out;
3946
3947         ret = 0;
3948
3949         while (!kthread_should_stop()) {
3950                 /*
3951                  * Ensure that both TX and RX per connection kthreads
3952                  * are scheduled to run on the same CPU.
3953                  */
3954                 iscsit_thread_check_cpumask(conn, current, 1);
3955
3956                 wait_event_interruptible(conn->queues_wq,
3957                                          !iscsit_conn_all_queues_empty(conn) ||
3958                                          ts->status == ISCSI_THREAD_SET_RESET);
3959
3960                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3961                      signal_pending(current))
3962                         goto transport_err;
3963
3964 get_immediate:
3965                 ret = iscsit_handle_immediate_queue(conn);
3966                 if (ret < 0)
3967                         goto transport_err;
3968
3969                 ret = iscsit_handle_response_queue(conn);
3970                 if (ret == 1)
3971                         goto get_immediate;
3972                 else if (ret == -EAGAIN)
3973                         goto restart;
3974                 else if (ret < 0)
3975                         goto transport_err;
3976         }
3977
3978 transport_err:
3979         iscsit_take_action_for_connection_exit(conn);
3980         goto restart;
3981 out:
3982         return 0;
3983 }
3984
3985 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3986 {
3987         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3988         struct iscsi_cmd *cmd;
3989         int ret = 0;
3990
3991         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3992         case ISCSI_OP_SCSI_CMD:
3993                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3994                 if (!cmd)
3995                         goto reject;
3996
3997                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3998                 break;
3999         case ISCSI_OP_SCSI_DATA_OUT:
4000                 ret = iscsit_handle_data_out(conn, buf);
4001                 break;
4002         case ISCSI_OP_NOOP_OUT:
4003                 cmd = NULL;
4004                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4005                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4006                         if (!cmd)
4007                                 goto reject;
4008                 }
4009                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4010                 break;
4011         case ISCSI_OP_SCSI_TMFUNC:
4012                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4013                 if (!cmd)
4014                         goto reject;
4015
4016                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4017                 break;
4018         case ISCSI_OP_TEXT:
4019                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4020                 if (!cmd)
4021                         goto reject;
4022
4023                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4024                 break;
4025         case ISCSI_OP_LOGOUT:
4026                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4027                 if (!cmd)
4028                         goto reject;
4029
4030                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4031                 if (ret > 0)
4032                         wait_for_completion_timeout(&conn->conn_logout_comp,
4033                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4034                 break;
4035         case ISCSI_OP_SNACK:
4036                 ret = iscsit_handle_snack(conn, buf);
4037                 break;
4038         default:
4039                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4040                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4041                         pr_err("Cannot recover from unknown"
4042                         " opcode while ERL=0, closing iSCSI connection.\n");
4043                         return -1;
4044                 }
4045                 if (!conn->conn_ops->OFMarker) {
4046                         pr_err("Unable to recover from unknown"
4047                         " opcode while OFMarker=No, closing iSCSI"
4048                                 " connection.\n");
4049                         return -1;
4050                 }
4051                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4052                         pr_err("Unable to recover from unknown"
4053                                 " opcode, closing iSCSI connection.\n");
4054                         return -1;
4055                 }
4056                 break;
4057         }
4058
4059         return ret;
4060 reject:
4061         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4062 }
4063
4064 int iscsi_target_rx_thread(void *arg)
4065 {
4066         int ret;
4067         u8 buffer[ISCSI_HDR_LEN], opcode;
4068         u32 checksum = 0, digest = 0;
4069         struct iscsi_conn *conn = NULL;
4070         struct iscsi_thread_set *ts = arg;
4071         struct kvec iov;
4072         /*
4073          * Allow ourselves to be interrupted by SIGINT so that a
4074          * connection recovery / failure event can be triggered externally.
4075          */
4076         allow_signal(SIGINT);
4077
4078 restart:
4079         conn = iscsi_rx_thread_pre_handler(ts);
4080         if (!conn)
4081                 goto out;
4082
4083         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4084                 struct completion comp;
4085                 int rc;
4086
4087                 init_completion(&comp);
4088                 rc = wait_for_completion_interruptible(&comp);
4089                 if (rc < 0)
4090                         goto transport_err;
4091
4092                 goto out;
4093         }
4094
4095         while (!kthread_should_stop()) {
4096                 /*
4097                  * Ensure that both TX and RX per connection kthreads
4098                  * are scheduled to run on the same CPU.
4099                  */
4100                 iscsit_thread_check_cpumask(conn, current, 0);
4101
4102                 memset(buffer, 0, ISCSI_HDR_LEN);
4103                 memset(&iov, 0, sizeof(struct kvec));
4104
4105                 iov.iov_base    = buffer;
4106                 iov.iov_len     = ISCSI_HDR_LEN;
4107
4108                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4109                 if (ret != ISCSI_HDR_LEN) {
4110                         iscsit_rx_thread_wait_for_tcp(conn);
4111                         goto transport_err;
4112                 }
4113
4114                 if (conn->conn_ops->HeaderDigest) {
4115                         iov.iov_base    = &digest;
4116                         iov.iov_len     = ISCSI_CRC_LEN;
4117
4118                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4119                         if (ret != ISCSI_CRC_LEN) {
4120                                 iscsit_rx_thread_wait_for_tcp(conn);
4121                                 goto transport_err;
4122                         }
4123
4124                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4125                                         buffer, ISCSI_HDR_LEN,
4126                                         0, NULL, (u8 *)&checksum);
4127
4128                         if (digest != checksum) {
4129                                 pr_err("HeaderDigest CRC32C failed,"
4130                                         " received 0x%08x, computed 0x%08x\n",
4131                                         digest, checksum);
4132                                 /*
4133                                  * Set the PDU to 0xff so it will intentionally
4134                                  * hit default in the switch below.
4135                                  */
4136                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4137                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4138                         } else {
4139                                 pr_debug("Got HeaderDigest CRC32C"
4140                                                 " 0x%08x\n", checksum);
4141                         }
4142                 }
4143
4144                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4145                         goto transport_err;
4146
4147                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4148
4149                 if (conn->sess->sess_ops->SessionType &&
4150                    ((!(opcode & ISCSI_OP_TEXT)) ||
4151                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4152                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4153                         " while in Discovery Session, rejecting.\n", opcode);
4154                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4155                                           buffer);
4156                         goto transport_err;
4157                 }
4158
4159                 ret = iscsi_target_rx_opcode(conn, buffer);
4160                 if (ret < 0)
4161                         goto transport_err;
4162         }
4163
4164 transport_err:
4165         if (!signal_pending(current))
4166                 atomic_set(&conn->transport_failed, 1);
4167         iscsit_take_action_for_connection_exit(conn);
4168         goto restart;
4169 out:
4170         return 0;
4171 }
4172
4173 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4174 {
4175         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4176         struct iscsi_session *sess = conn->sess;
4177         /*
4178          * We expect this function to only ever be called from either RX or TX
4179          * thread context via iscsit_close_connection() once the other context
4180          * has been reset -> returned sleeping pre-handler state.
4181          */
4182         spin_lock_bh(&conn->cmd_lock);
4183         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4184
4185                 list_del_init(&cmd->i_conn_node);
4186                 spin_unlock_bh(&conn->cmd_lock);
4187
4188                 iscsit_increment_maxcmdsn(cmd, sess);
4189
4190                 iscsit_free_cmd(cmd, true);
4191
4192                 spin_lock_bh(&conn->cmd_lock);
4193         }
4194         spin_unlock_bh(&conn->cmd_lock);
4195 }
4196
4197 static void iscsit_stop_timers_for_cmds(
4198         struct iscsi_conn *conn)
4199 {
4200         struct iscsi_cmd *cmd;
4201
4202         spin_lock_bh(&conn->cmd_lock);
4203         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4204                 if (cmd->data_direction == DMA_TO_DEVICE)
4205                         iscsit_stop_dataout_timer(cmd);
4206         }
4207         spin_unlock_bh(&conn->cmd_lock);
4208 }
4209
4210 int iscsit_close_connection(
4211         struct iscsi_conn *conn)
4212 {
4213         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4214         struct iscsi_session    *sess = conn->sess;
4215
4216         pr_debug("Closing iSCSI connection CID %hu on SID:"
4217                 " %u\n", conn->cid, sess->sid);
4218         /*
4219          * Always up conn_logout_comp just in case the RX Thread is sleeping
4220          * and the logout response never got sent because the connection
4221          * failed.
4222          */
4223         complete(&conn->conn_logout_comp);
4224
4225         iscsi_release_thread_set(conn);
4226
4227         iscsit_stop_timers_for_cmds(conn);
4228         iscsit_stop_nopin_response_timer(conn);
4229         iscsit_stop_nopin_timer(conn);
4230
4231         if (conn->conn_transport->iscsit_wait_conn)
4232                 conn->conn_transport->iscsit_wait_conn(conn);
4233
4234         iscsit_free_queue_reqs_for_conn(conn);
4235
4236         /*
4237          * During Connection recovery drop unacknowledged out of order
4238          * commands for this connection, and prepare the other commands
4239          * for realligence.
4240          *
4241          * During normal operation clear the out of order commands (but
4242          * do not free the struct iscsi_ooo_cmdsn's) and release all
4243          * struct iscsi_cmds.
4244          */
4245         if (atomic_read(&conn->connection_recovery)) {
4246                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4247                 iscsit_prepare_cmds_for_realligance(conn);
4248         } else {
4249                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4250                 iscsit_release_commands_from_conn(conn);
4251         }
4252
4253         /*
4254          * Handle decrementing session or connection usage count if
4255          * a logout response was not able to be sent because the
4256          * connection failed.  Fall back to Session Recovery here.
4257          */
4258         if (atomic_read(&conn->conn_logout_remove)) {
4259                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4260                         iscsit_dec_conn_usage_count(conn);
4261                         iscsit_dec_session_usage_count(sess);
4262                 }
4263                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4264                         iscsit_dec_conn_usage_count(conn);
4265
4266                 atomic_set(&conn->conn_logout_remove, 0);
4267                 atomic_set(&sess->session_reinstatement, 0);
4268                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4269         }
4270
4271         spin_lock_bh(&sess->conn_lock);
4272         list_del(&conn->conn_list);
4273
4274         /*
4275          * Attempt to let the Initiator know this connection failed by
4276          * sending an Connection Dropped Async Message on another
4277          * active connection.
4278          */
4279         if (atomic_read(&conn->connection_recovery))
4280                 iscsit_build_conn_drop_async_message(conn);
4281
4282         spin_unlock_bh(&sess->conn_lock);
4283
4284         /*
4285          * If connection reinstatement is being performed on this connection,
4286          * up the connection reinstatement semaphore that is being blocked on
4287          * in iscsit_cause_connection_reinstatement().
4288          */
4289         spin_lock_bh(&conn->state_lock);
4290         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4291                 spin_unlock_bh(&conn->state_lock);
4292                 complete(&conn->conn_wait_comp);
4293                 wait_for_completion(&conn->conn_post_wait_comp);
4294                 spin_lock_bh(&conn->state_lock);
4295         }
4296
4297         /*
4298          * If connection reinstatement is being performed on this connection
4299          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4300          * connection wait rcfr semaphore that is being blocked on
4301          * an iscsit_connection_reinstatement_rcfr().
4302          */
4303         if (atomic_read(&conn->connection_wait_rcfr)) {
4304                 spin_unlock_bh(&conn->state_lock);
4305                 complete(&conn->conn_wait_rcfr_comp);
4306                 wait_for_completion(&conn->conn_post_wait_comp);
4307                 spin_lock_bh(&conn->state_lock);
4308         }
4309         atomic_set(&conn->connection_reinstatement, 1);
4310         spin_unlock_bh(&conn->state_lock);
4311
4312         /*
4313          * If any other processes are accessing this connection pointer we
4314          * must wait until they have completed.
4315          */
4316         iscsit_check_conn_usage_count(conn);
4317
4318         if (conn->conn_rx_hash.tfm)
4319                 crypto_free_hash(conn->conn_rx_hash.tfm);
4320         if (conn->conn_tx_hash.tfm)
4321                 crypto_free_hash(conn->conn_tx_hash.tfm);
4322
4323         if (conn->conn_cpumask)
4324                 free_cpumask_var(conn->conn_cpumask);
4325
4326         kfree(conn->conn_ops);
4327         conn->conn_ops = NULL;
4328
4329         if (conn->sock)
4330                 sock_release(conn->sock);
4331
4332         if (conn->conn_transport->iscsit_free_conn)
4333                 conn->conn_transport->iscsit_free_conn(conn);
4334
4335         iscsit_put_transport(conn->conn_transport);
4336
4337         conn->thread_set = NULL;
4338
4339         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4340         conn->conn_state = TARG_CONN_STATE_FREE;
4341         kfree(conn);
4342
4343         spin_lock_bh(&sess->conn_lock);
4344         atomic_dec(&sess->nconn);
4345         pr_debug("Decremented iSCSI connection count to %hu from node:"
4346                 " %s\n", atomic_read(&sess->nconn),
4347                 sess->sess_ops->InitiatorName);
4348         /*
4349          * Make sure that if one connection fails in an non ERL=2 iSCSI
4350          * Session that they all fail.
4351          */
4352         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4353              !atomic_read(&sess->session_logout))
4354                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4355
4356         /*
4357          * If this was not the last connection in the session, and we are
4358          * performing session reinstatement or falling back to ERL=0, call
4359          * iscsit_stop_session() without sleeping to shutdown the other
4360          * active connections.
4361          */
4362         if (atomic_read(&sess->nconn)) {
4363                 if (!atomic_read(&sess->session_reinstatement) &&
4364                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4365                         spin_unlock_bh(&sess->conn_lock);
4366                         return 0;
4367                 }
4368                 if (!atomic_read(&sess->session_stop_active)) {
4369                         atomic_set(&sess->session_stop_active, 1);
4370                         spin_unlock_bh(&sess->conn_lock);
4371                         iscsit_stop_session(sess, 0, 0);
4372                         return 0;
4373                 }
4374                 spin_unlock_bh(&sess->conn_lock);
4375                 return 0;
4376         }
4377
4378         /*
4379          * If this was the last connection in the session and one of the
4380          * following is occurring:
4381          *
4382          * Session Reinstatement is not being performed, and are falling back
4383          * to ERL=0 call iscsit_close_session().
4384          *
4385          * Session Logout was requested.  iscsit_close_session() will be called
4386          * elsewhere.
4387          *
4388          * Session Continuation is not being performed, start the Time2Retain
4389          * handler and check if sleep_on_sess_wait_sem is active.
4390          */
4391         if (!atomic_read(&sess->session_reinstatement) &&
4392              atomic_read(&sess->session_fall_back_to_erl0)) {
4393                 spin_unlock_bh(&sess->conn_lock);
4394                 target_put_session(sess->se_sess);
4395
4396                 return 0;
4397         } else if (atomic_read(&sess->session_logout)) {
4398                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4399                 sess->session_state = TARG_SESS_STATE_FREE;
4400                 spin_unlock_bh(&sess->conn_lock);
4401
4402                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4403                         complete(&sess->session_wait_comp);
4404
4405                 return 0;
4406         } else {
4407                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4408                 sess->session_state = TARG_SESS_STATE_FAILED;
4409
4410                 if (!atomic_read(&sess->session_continuation)) {
4411                         spin_unlock_bh(&sess->conn_lock);
4412                         iscsit_start_time2retain_handler(sess);
4413                 } else
4414                         spin_unlock_bh(&sess->conn_lock);
4415
4416                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4417                         complete(&sess->session_wait_comp);
4418
4419                 return 0;
4420         }
4421         spin_unlock_bh(&sess->conn_lock);
4422
4423         return 0;
4424 }
4425
4426 int iscsit_close_session(struct iscsi_session *sess)
4427 {
4428         struct iscsi_portal_group *tpg = sess->tpg;
4429         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4430
4431         if (atomic_read(&sess->nconn)) {
4432                 pr_err("%d connection(s) still exist for iSCSI session"
4433                         " to %s\n", atomic_read(&sess->nconn),
4434                         sess->sess_ops->InitiatorName);
4435                 BUG();
4436         }
4437
4438         spin_lock_bh(&se_tpg->session_lock);
4439         atomic_set(&sess->session_logout, 1);
4440         atomic_set(&sess->session_reinstatement, 1);
4441         iscsit_stop_time2retain_timer(sess);
4442         spin_unlock_bh(&se_tpg->session_lock);
4443
4444         /*
4445          * transport_deregister_session_configfs() will clear the
4446          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4447          * can be setting it again with __transport_register_session() in
4448          * iscsi_post_login_handler() again after the iscsit_stop_session()
4449          * completes in iscsi_np context.
4450          */
4451         transport_deregister_session_configfs(sess->se_sess);
4452
4453         /*
4454          * If any other processes are accessing this session pointer we must
4455          * wait until they have completed.  If we are in an interrupt (the
4456          * time2retain handler) and contain and active session usage count we
4457          * restart the timer and exit.
4458          */
4459         if (!in_interrupt()) {
4460                 if (iscsit_check_session_usage_count(sess) == 1)
4461                         iscsit_stop_session(sess, 1, 1);
4462         } else {
4463                 if (iscsit_check_session_usage_count(sess) == 2) {
4464                         atomic_set(&sess->session_logout, 0);
4465                         iscsit_start_time2retain_handler(sess);
4466                         return 0;
4467                 }
4468         }
4469
4470         transport_deregister_session(sess->se_sess);
4471
4472         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4473                 iscsit_free_connection_recovery_entires(sess);
4474
4475         iscsit_free_all_ooo_cmdsns(sess);
4476
4477         spin_lock_bh(&se_tpg->session_lock);
4478         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4479         sess->session_state = TARG_SESS_STATE_FREE;
4480         pr_debug("Released iSCSI session from node: %s\n",
4481                         sess->sess_ops->InitiatorName);
4482         tpg->nsessions--;
4483         if (tpg->tpg_tiqn)
4484                 tpg->tpg_tiqn->tiqn_nsessions--;
4485
4486         pr_debug("Decremented number of active iSCSI Sessions on"
4487                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4488
4489         spin_lock(&sess_idr_lock);
4490         idr_remove(&sess_idr, sess->session_index);
4491         spin_unlock(&sess_idr_lock);
4492
4493         kfree(sess->sess_ops);
4494         sess->sess_ops = NULL;
4495         spin_unlock_bh(&se_tpg->session_lock);
4496
4497         kfree(sess);
4498         return 0;
4499 }
4500
4501 static void iscsit_logout_post_handler_closesession(
4502         struct iscsi_conn *conn)
4503 {
4504         struct iscsi_session *sess = conn->sess;
4505
4506         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4507         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4508
4509         atomic_set(&conn->conn_logout_remove, 0);
4510         complete(&conn->conn_logout_comp);
4511
4512         iscsit_dec_conn_usage_count(conn);
4513         iscsit_stop_session(sess, 1, 1);
4514         iscsit_dec_session_usage_count(sess);
4515         target_put_session(sess->se_sess);
4516 }
4517
4518 static void iscsit_logout_post_handler_samecid(
4519         struct iscsi_conn *conn)
4520 {
4521         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4522         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4523
4524         atomic_set(&conn->conn_logout_remove, 0);
4525         complete(&conn->conn_logout_comp);
4526
4527         iscsit_cause_connection_reinstatement(conn, 1);
4528         iscsit_dec_conn_usage_count(conn);
4529 }
4530
4531 static void iscsit_logout_post_handler_diffcid(
4532         struct iscsi_conn *conn,
4533         u16 cid)
4534 {
4535         struct iscsi_conn *l_conn;
4536         struct iscsi_session *sess = conn->sess;
4537
4538         if (!sess)
4539                 return;
4540
4541         spin_lock_bh(&sess->conn_lock);
4542         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4543                 if (l_conn->cid == cid) {
4544                         iscsit_inc_conn_usage_count(l_conn);
4545                         break;
4546                 }
4547         }
4548         spin_unlock_bh(&sess->conn_lock);
4549
4550         if (!l_conn)
4551                 return;
4552
4553         if (l_conn->sock)
4554                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4555
4556         spin_lock_bh(&l_conn->state_lock);
4557         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4558         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4559         spin_unlock_bh(&l_conn->state_lock);
4560
4561         iscsit_cause_connection_reinstatement(l_conn, 1);
4562         iscsit_dec_conn_usage_count(l_conn);
4563 }
4564
4565 /*
4566  *      Return of 0 causes the TX thread to restart.
4567  */
4568 int iscsit_logout_post_handler(
4569         struct iscsi_cmd *cmd,
4570         struct iscsi_conn *conn)
4571 {
4572         int ret = 0;
4573
4574         switch (cmd->logout_reason) {
4575         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4576                 switch (cmd->logout_response) {
4577                 case ISCSI_LOGOUT_SUCCESS:
4578                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4579                 default:
4580                         iscsit_logout_post_handler_closesession(conn);
4581                         break;
4582                 }
4583                 ret = 0;
4584                 break;
4585         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4586                 if (conn->cid == cmd->logout_cid) {
4587                         switch (cmd->logout_response) {
4588                         case ISCSI_LOGOUT_SUCCESS:
4589                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4590                         default:
4591                                 iscsit_logout_post_handler_samecid(conn);
4592                                 break;
4593                         }
4594                         ret = 0;
4595                 } else {
4596                         switch (cmd->logout_response) {
4597                         case ISCSI_LOGOUT_SUCCESS:
4598                                 iscsit_logout_post_handler_diffcid(conn,
4599                                         cmd->logout_cid);
4600                                 break;
4601                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4602                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4603                         default:
4604                                 break;
4605                         }
4606                         ret = 1;
4607                 }
4608                 break;
4609         case ISCSI_LOGOUT_REASON_RECOVERY:
4610                 switch (cmd->logout_response) {
4611                 case ISCSI_LOGOUT_SUCCESS:
4612                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4613                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4614                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4615                 default:
4616                         break;
4617                 }
4618                 ret = 1;
4619                 break;
4620         default:
4621                 break;
4622
4623         }
4624         return ret;
4625 }
4626 EXPORT_SYMBOL(iscsit_logout_post_handler);
4627
4628 void iscsit_fail_session(struct iscsi_session *sess)
4629 {
4630         struct iscsi_conn *conn;
4631
4632         spin_lock_bh(&sess->conn_lock);
4633         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4634                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4635                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4636         }
4637         spin_unlock_bh(&sess->conn_lock);
4638
4639         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4640         sess->session_state = TARG_SESS_STATE_FAILED;
4641 }
4642
4643 int iscsit_free_session(struct iscsi_session *sess)
4644 {
4645         u16 conn_count = atomic_read(&sess->nconn);
4646         struct iscsi_conn *conn, *conn_tmp = NULL;
4647         int is_last;
4648
4649         spin_lock_bh(&sess->conn_lock);
4650         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4651
4652         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4653                         conn_list) {
4654                 if (conn_count == 0)
4655                         break;
4656
4657                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4658                         is_last = 1;
4659                 } else {
4660                         iscsit_inc_conn_usage_count(conn_tmp);
4661                         is_last = 0;
4662                 }
4663                 iscsit_inc_conn_usage_count(conn);
4664
4665                 spin_unlock_bh(&sess->conn_lock);
4666                 iscsit_cause_connection_reinstatement(conn, 1);
4667                 spin_lock_bh(&sess->conn_lock);
4668
4669                 iscsit_dec_conn_usage_count(conn);
4670                 if (is_last == 0)
4671                         iscsit_dec_conn_usage_count(conn_tmp);
4672
4673                 conn_count--;
4674         }
4675
4676         if (atomic_read(&sess->nconn)) {
4677                 spin_unlock_bh(&sess->conn_lock);
4678                 wait_for_completion(&sess->session_wait_comp);
4679         } else
4680                 spin_unlock_bh(&sess->conn_lock);
4681
4682         target_put_session(sess->se_sess);
4683         return 0;
4684 }
4685
4686 void iscsit_stop_session(
4687         struct iscsi_session *sess,
4688         int session_sleep,
4689         int connection_sleep)
4690 {
4691         u16 conn_count = atomic_read(&sess->nconn);
4692         struct iscsi_conn *conn, *conn_tmp = NULL;
4693         int is_last;
4694
4695         spin_lock_bh(&sess->conn_lock);
4696         if (session_sleep)
4697                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4698
4699         if (connection_sleep) {
4700                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4701                                 conn_list) {
4702                         if (conn_count == 0)
4703                                 break;
4704
4705                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4706                                 is_last = 1;
4707                         } else {
4708                                 iscsit_inc_conn_usage_count(conn_tmp);
4709                                 is_last = 0;
4710                         }
4711                         iscsit_inc_conn_usage_count(conn);
4712
4713                         spin_unlock_bh(&sess->conn_lock);
4714                         iscsit_cause_connection_reinstatement(conn, 1);
4715                         spin_lock_bh(&sess->conn_lock);
4716
4717                         iscsit_dec_conn_usage_count(conn);
4718                         if (is_last == 0)
4719                                 iscsit_dec_conn_usage_count(conn_tmp);
4720                         conn_count--;
4721                 }
4722         } else {
4723                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4724                         iscsit_cause_connection_reinstatement(conn, 0);
4725         }
4726
4727         if (session_sleep && atomic_read(&sess->nconn)) {
4728                 spin_unlock_bh(&sess->conn_lock);
4729                 wait_for_completion(&sess->session_wait_comp);
4730         } else
4731                 spin_unlock_bh(&sess->conn_lock);
4732 }
4733
4734 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4735 {
4736         struct iscsi_session *sess;
4737         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4738         struct se_session *se_sess, *se_sess_tmp;
4739         int session_count = 0;
4740
4741         spin_lock_bh(&se_tpg->session_lock);
4742         if (tpg->nsessions && !force) {
4743                 spin_unlock_bh(&se_tpg->session_lock);
4744                 return -1;
4745         }
4746
4747         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4748                         sess_list) {
4749                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4750
4751                 spin_lock(&sess->conn_lock);
4752                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4753                     atomic_read(&sess->session_logout) ||
4754                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4755                         spin_unlock(&sess->conn_lock);
4756                         continue;
4757                 }
4758                 atomic_set(&sess->session_reinstatement, 1);
4759                 spin_unlock(&sess->conn_lock);
4760                 spin_unlock_bh(&se_tpg->session_lock);
4761
4762                 iscsit_free_session(sess);
4763                 spin_lock_bh(&se_tpg->session_lock);
4764
4765                 session_count++;
4766         }
4767         spin_unlock_bh(&se_tpg->session_lock);
4768
4769         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4770                         " Group: %hu\n", session_count, tpg->tpgt);
4771         return 0;
4772 }
4773
4774 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4775 MODULE_VERSION("4.1.x");
4776 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4777 MODULE_LICENSE("GPL");
4778
4779 module_init(iscsi_target_init_module);
4780 module_exit(iscsi_target_cleanup_module);