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 && (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) {
 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                 np->enabled = true;
 464                 spin_unlock_bh(&np->np_thread_lock);
 465                 return 0;
 466         }
 467         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 468         spin_unlock_bh(&np->np_thread_lock);
 469
 470         if (np->np_thread) {
 471                 /*
 472                  * We need to send the signal to wakeup Linux/Net
 473                  * which may be sleeping in sock_accept()..
 474                  */
 475                 send_sig(SIGINT, np->np_thread, 1);
 476                 kthread_stop(np->np_thread);
 477                 np->np_thread = NULL;
 478         }
 479
 480         np->np_transport->iscsit_free_np(np);
 481
 482         mutex_lock(&np_lock);
 483         list_del(&np->np_list);
 484         mutex_unlock(&np_lock);
 485
 486         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 487                 np->np_ip, np->np_port, np->np_transport->name);
 488
 489         iscsit_put_transport(np->np_transport);
 490         kfree(np);
 491         return 0;
 492 }
 493
 494 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 495 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 496
 497 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 498 {
 499         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 500         return 0;
 501 }
 502
 503 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 504 {
 505         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 506
 507         spin_lock_bh(&conn->cmd_lock);
 508         if (!list_empty(&cmd->i_conn_node))
 509                 list_del_init(&cmd->i_conn_node);
 510         spin_unlock_bh(&conn->cmd_lock);
 511
 512         __iscsit_free_cmd(cmd, scsi_cmd, true);
 513 }
 514
 515 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 516 {
 517         return TARGET_PROT_NORMAL;
 518 }
 519
 520 static struct iscsit_transport iscsi_target_transport = {
 521         .name                   = "iSCSI/TCP",
 522         .transport_type         = ISCSI_TCP,
 523         .owner                  = NULL,
 524         .iscsit_setup_np        = iscsit_setup_np,
 525         .iscsit_accept_np       = iscsit_accept_np,
 526         .iscsit_free_np         = iscsit_free_np,
 527         .iscsit_get_login_rx    = iscsit_get_login_rx,
 528         .iscsit_put_login_tx    = iscsit_put_login_tx,
 529         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 530         .iscsit_immediate_queue = iscsit_immediate_queue,
 531         .iscsit_response_queue  = iscsit_response_queue,
 532         .iscsit_queue_data_in   = iscsit_queue_rsp,
 533         .iscsit_queue_status    = iscsit_queue_rsp,
 534         .iscsit_aborted_task    = iscsit_aborted_task,
 535         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 536 };
 537
 538 static int __init iscsi_target_init_module(void)
 539 {
 540         int ret = 0;
 541
 542         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 543
 544         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 545         if (!iscsit_global) {
 546                 pr_err("Unable to allocate memory for iscsit_global\n");
 547                 return -1;
 548         }
 549         mutex_init(&auth_id_lock);
 550         spin_lock_init(&sess_idr_lock);
 551         idr_init(&tiqn_idr);
 552         idr_init(&sess_idr);
 553
 554         ret = iscsi_target_register_configfs();
 555         if (ret < 0)
 556                 goto out;
 557
 558         ret = iscsi_thread_set_init();
 559         if (ret < 0)
 560                 goto configfs_out;
 561
 562         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 563                         TARGET_THREAD_SET_COUNT) {
 564                 pr_err("iscsi_allocate_thread_sets() returned"
 565                         " unexpected value!\n");
 566                 goto ts_out1;
 567         }
 568
 569         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 570                         sizeof(struct iscsi_queue_req),
 571                         __alignof__(struct iscsi_queue_req), 0, NULL);
 572         if (!lio_qr_cache) {
 573                 pr_err("nable to kmem_cache_create() for"
 574                                 " lio_qr_cache\n");
 575                 goto ts_out2;
 576         }
 577
 578         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 579                         sizeof(struct iscsi_datain_req),
 580                         __alignof__(struct iscsi_datain_req), 0, NULL);
 581         if (!lio_dr_cache) {
 582                 pr_err("Unable to kmem_cache_create() for"
 583                                 " lio_dr_cache\n");
 584                 goto qr_out;
 585         }
 586
 587         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 588                         sizeof(struct iscsi_ooo_cmdsn),
 589                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 590         if (!lio_ooo_cache) {
 591                 pr_err("Unable to kmem_cache_create() for"
 592                                 " lio_ooo_cache\n");
 593                 goto dr_out;
 594         }
 595
 596         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 597                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 598                         0, NULL);
 599         if (!lio_r2t_cache) {
 600                 pr_err("Unable to kmem_cache_create() for"
 601                                 " lio_r2t_cache\n");
 602                 goto ooo_out;
 603         }
 604
 605         iscsit_register_transport(&iscsi_target_transport);
 606
 607         if (iscsit_load_discovery_tpg() < 0)
 608                 goto r2t_out;
 609
 610         return ret;
 611 r2t_out:
 612         iscsit_unregister_transport(&iscsi_target_transport);
 613         kmem_cache_destroy(lio_r2t_cache);
 614 ooo_out:
 615         kmem_cache_destroy(lio_ooo_cache);
 616 dr_out:
 617         kmem_cache_destroy(lio_dr_cache);
 618 qr_out:
 619         kmem_cache_destroy(lio_qr_cache);
 620 ts_out2:
 621         iscsi_deallocate_thread_sets();
 622 ts_out1:
 623         iscsi_thread_set_free();
 624 configfs_out:
 625         iscsi_target_deregister_configfs();
 626 out:
 627         kfree(iscsit_global);
 628         return -ENOMEM;
 629 }
 630
 631 static void __exit iscsi_target_cleanup_module(void)
 632 {
 633         iscsi_deallocate_thread_sets();
 634         iscsi_thread_set_free();
 635         iscsit_release_discovery_tpg();
 636         iscsit_unregister_transport(&iscsi_target_transport);
 637         kmem_cache_destroy(lio_qr_cache);
 638         kmem_cache_destroy(lio_dr_cache);
 639         kmem_cache_destroy(lio_ooo_cache);
 640         kmem_cache_destroy(lio_r2t_cache);
 641
 642         iscsi_target_deregister_configfs();
 643
 644         kfree(iscsit_global);
 645 }
 646
 647 static int iscsit_add_reject(
 648         struct iscsi_conn *conn,
 649         u8 reason,
 650         unsigned char *buf)
 651 {
 652         struct iscsi_cmd *cmd;
 653
 654         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 655         if (!cmd)
 656                 return -1;
 657
 658         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 659         cmd->reject_reason = reason;
 660
 661         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 662         if (!cmd->buf_ptr) {
 663                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 664                 iscsit_free_cmd(cmd, false);
 665                 return -1;
 666         }
 667
 668         spin_lock_bh(&conn->cmd_lock);
 669         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 670         spin_unlock_bh(&conn->cmd_lock);
 671
 672         cmd->i_state = ISTATE_SEND_REJECT;
 673         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 674
 675         return -1;
 676 }
 677
 678 static int iscsit_add_reject_from_cmd(
 679         struct iscsi_cmd *cmd,
 680         u8 reason,
 681         bool add_to_conn,
 682         unsigned char *buf)
 683 {
 684         struct iscsi_conn *conn;
 685
 686         if (!cmd->conn) {
 687                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 688                                 cmd->init_task_tag);
 689                 return -1;
 690         }
 691         conn = cmd->conn;
 692
 693         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 694         cmd->reject_reason = reason;
 695
 696         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 697         if (!cmd->buf_ptr) {
 698                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 699                 iscsit_free_cmd(cmd, false);
 700                 return -1;
 701         }
 702
 703         if (add_to_conn) {
 704                 spin_lock_bh(&conn->cmd_lock);
 705                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 706                 spin_unlock_bh(&conn->cmd_lock);
 707         }
 708
 709         cmd->i_state = ISTATE_SEND_REJECT;
 710         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 711         /*
 712          * Perform the kref_put now if se_cmd has already been setup by
 713          * scsit_setup_scsi_cmd()
 714          */
 715         if (cmd->se_cmd.se_tfo != NULL) {
 716                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 717                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 718         }
 719         return -1;
 720 }
 721
 722 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 723                                  unsigned char *buf)
 724 {
 725         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 726 }
 727
 728 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 729 {
 730         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 731 }
 732
 733 /*
 734  * Map some portion of the allocated scatterlist to an iovec, suitable for
 735  * kernel sockets to copy data in/out.
 736  */
 737 static int iscsit_map_iovec(
 738         struct iscsi_cmd *cmd,
 739         struct kvec *iov,
 740         u32 data_offset,
 741         u32 data_length)
 742 {
 743         u32 i = 0;
 744         struct scatterlist *sg;
 745         unsigned int page_off;
 746
 747         /*
 748          * We know each entry in t_data_sg contains a page.
 749          */
 750         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 751         page_off = (data_offset % PAGE_SIZE);
 752
 753         cmd->first_data_sg = sg;
 754         cmd->first_data_sg_off = page_off;
 755
 756         while (data_length) {
 757                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 758
 759                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 760                 iov[i].iov_len = cur_len;
 761
 762                 data_length -= cur_len;
 763                 page_off = 0;
 764                 sg = sg_next(sg);
 765                 i++;
 766         }
 767
 768         cmd->kmapped_nents = i;
 769
 770         return i;
 771 }
 772
 773 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 774 {
 775         u32 i;
 776         struct scatterlist *sg;
 777
 778         sg = cmd->first_data_sg;
 779
 780         for (i = 0; i < cmd->kmapped_nents; i++)
 781                 kunmap(sg_page(&sg[i]));
 782 }
 783
 784 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 785 {
 786         LIST_HEAD(ack_list);
 787         struct iscsi_cmd *cmd, *cmd_p;
 788
 789         conn->exp_statsn = exp_statsn;
 790
 791         if (conn->sess->sess_ops->RDMAExtensions)
 792                 return;
 793
 794         spin_lock_bh(&conn->cmd_lock);
 795         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 796                 spin_lock(&cmd->istate_lock);
 797                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 798                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 799                         cmd->i_state = ISTATE_REMOVE;
 800                         spin_unlock(&cmd->istate_lock);
 801                         list_move_tail(&cmd->i_conn_node, &ack_list);
 802                         continue;
 803                 }
 804                 spin_unlock(&cmd->istate_lock);
 805         }
 806         spin_unlock_bh(&conn->cmd_lock);
 807
 808         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 809                 list_del_init(&cmd->i_conn_node);
 810                 iscsit_free_cmd(cmd, false);
 811         }
 812 }
 813
 814 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 815 {
 816         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 817
 818         iov_count += ISCSI_IOV_DATA_BUFFER;
 819
 820         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 821         if (!cmd->iov_data) {
 822                 pr_err("Unable to allocate cmd->iov_data\n");
 823                 return -ENOMEM;
 824         }
 825
 826         cmd->orig_iov_data_count = iov_count;
 827         return 0;
 828 }
 829
 830 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 831                           unsigned char *buf)
 832 {
 833         int data_direction, payload_length;
 834         struct iscsi_scsi_req *hdr;
 835         int iscsi_task_attr;
 836         int sam_task_attr;
 837
 838         atomic_long_inc(&conn->sess->cmd_pdus);
 839
 840         hdr                     = (struct iscsi_scsi_req *) buf;
 841         payload_length          = ntoh24(hdr->dlength);
 842
 843         /* FIXME; Add checks for AdditionalHeaderSegment */
 844
 845         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 846             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 847                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 848                                 " not set. Bad iSCSI Initiator.\n");
 849                 return iscsit_add_reject_cmd(cmd,
 850                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 851         }
 852
 853         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 854              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 855                 /*
 856                  * From RFC-3720 Section 10.3.1:
 857                  *
 858                  * "Either or both of R and W MAY be 1 when either the
 859                  *  Expected Data Transfer Length and/or Bidirectional Read
 860                  *  Expected Data Transfer Length are 0"
 861                  *
 862                  * For this case, go ahead and clear the unnecssary bits
 863                  * to avoid any confusion with ->data_direction.
 864                  */
 865                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 866                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 867
 868                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 869                         " set when Expected Data Transfer Length is 0 for"
 870                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 871         }
 872
 873         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 874             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 875                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 876                         " MUST be set if Expected Data Transfer Length is not 0."
 877                         " Bad iSCSI Initiator\n");
 878                 return iscsit_add_reject_cmd(cmd,
 879                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 880         }
 881
 882         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 883             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 884                 pr_err("Bidirectional operations not supported!\n");
 885                 return iscsit_add_reject_cmd(cmd,
 886                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 887         }
 888
 889         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 890                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 891                                 " Scsi Command PDU.\n");
 892                 return iscsit_add_reject_cmd(cmd,
 893                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 894         }
 895
 896         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 897                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 898                         " protocol error.\n", payload_length);
 899                 return iscsit_add_reject_cmd(cmd,
 900                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 901         }
 902
 903         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 904             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 905                 pr_err("Expected Data Transfer Length and Length of"
 906                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 907                         " bit is not set protocol error\n");
 908                 return iscsit_add_reject_cmd(cmd,
 909                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 910         }
 911
 912         if (payload_length > be32_to_cpu(hdr->data_length)) {
 913                 pr_err("DataSegmentLength: %u is greater than"
 914                         " EDTL: %u, protocol error.\n", payload_length,
 915                                 hdr->data_length);
 916                 return iscsit_add_reject_cmd(cmd,
 917                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 918         }
 919
 920         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 921                 pr_err("DataSegmentLength: %u is greater than"
 922                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 923                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 924                 return iscsit_add_reject_cmd(cmd,
 925                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 926         }
 927
 928         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 929                 pr_err("DataSegmentLength: %u is greater than"
 930                         " FirstBurstLength: %u, protocol error.\n",
 931                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 932                 return iscsit_add_reject_cmd(cmd,
 933                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 934         }
 935
 936         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 937                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 938                           DMA_NONE;
 939
 940         cmd->data_direction = data_direction;
 941         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 942         /*
 943          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 944          */
 945         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 946             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 947                 sam_task_attr = TCM_SIMPLE_TAG;
 948         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 949                 sam_task_attr = TCM_ORDERED_TAG;
 950         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 951                 sam_task_attr = TCM_HEAD_TAG;
 952         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 953                 sam_task_attr = TCM_ACA_TAG;
 954         else {
 955                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 956                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
 957                 sam_task_attr = TCM_SIMPLE_TAG;
 958         }
 959
 960         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 961         cmd->i_state            = ISTATE_NEW_CMD;
 962         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 963         cmd->immediate_data     = (payload_length) ? 1 : 0;
 964         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 965                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 966         if (cmd->unsolicited_data)
 967                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 968
 969         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 970         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 971                 spin_lock_bh(&conn->sess->ttt_lock);
 972                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 973                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 974                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 975                 spin_unlock_bh(&conn->sess->ttt_lock);
 976         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 977                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 978         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 979         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 980         cmd->first_burst_len    = payload_length;
 981
 982         if (!conn->sess->sess_ops->RDMAExtensions &&
 983              cmd->data_direction == DMA_FROM_DEVICE) {
 984                 struct iscsi_datain_req *dr;
 985
 986                 dr = iscsit_allocate_datain_req();
 987                 if (!dr)
 988                         return iscsit_add_reject_cmd(cmd,
 989                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 990
 991                 iscsit_attach_datain_req(cmd, dr);
 992         }
 993
 994         /*
 995          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 996          */
 997         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 998                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 999                         cmd->data_direction, sam_task_attr,
1000                         cmd->sense_buffer + 2);
1001
1002         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1003                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1004                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1005                 conn->cid);
1006
1007         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1008
1009         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1010                                                      scsilun_to_int(&hdr->lun));
1011         if (cmd->sense_reason)
1012                 goto attach_cmd;
1013
1014         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1015         if (cmd->sense_reason) {
1016                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1017                         return iscsit_add_reject_cmd(cmd,
1018                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1019                 }
1020
1021                 goto attach_cmd;
1022         }
1023
1024         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1025                 return iscsit_add_reject_cmd(cmd,
1026                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1027         }
1028
1029 attach_cmd:
1030         spin_lock_bh(&conn->cmd_lock);
1031         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1032         spin_unlock_bh(&conn->cmd_lock);
1033         /*
1034          * Check if we need to delay processing because of ALUA
1035          * Active/NonOptimized primary access state..
1036          */
1037         core_alua_check_nonop_delay(&cmd->se_cmd);
1038
1039         return 0;
1040 }
1041 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1042
1043 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1044 {
1045         iscsit_set_dataout_sequence_values(cmd);
1046
1047         spin_lock_bh(&cmd->dataout_timeout_lock);
1048         iscsit_start_dataout_timer(cmd, cmd->conn);
1049         spin_unlock_bh(&cmd->dataout_timeout_lock);
1050 }
1051 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1052
1053 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1054                             struct iscsi_scsi_req *hdr)
1055 {
1056         int cmdsn_ret = 0;
1057         /*
1058          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1059          * the Immediate Bit is not set, and no Immediate
1060          * Data is attached.
1061          *
1062          * A PDU/CmdSN carrying Immediate Data can only
1063          * be processed after the DataCRC has passed.
1064          * If the DataCRC fails, the CmdSN MUST NOT
1065          * be acknowledged. (See below)
1066          */
1067         if (!cmd->immediate_data) {
1068                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1069                                         (unsigned char *)hdr, hdr->cmdsn);
1070                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1071                         return -1;
1072                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1073                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1074                         return 0;
1075                 }
1076         }
1077
1078         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1079
1080         /*
1081          * If no Immediate Data is attached, it's OK to return now.
1082          */
1083         if (!cmd->immediate_data) {
1084                 if (!cmd->sense_reason && cmd->unsolicited_data)
1085                         iscsit_set_unsoliticed_dataout(cmd);
1086                 if (!cmd->sense_reason)
1087                         return 0;
1088
1089                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1090                 return 0;
1091         }
1092
1093         /*
1094          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1095          * execution.  These exceptions are processed in CmdSN order using
1096          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1097          */
1098         if (cmd->sense_reason) {
1099                 if (cmd->reject_reason)
1100                         return 0;
1101
1102                 return 1;
1103         }
1104         /*
1105          * Call directly into transport_generic_new_cmd() to perform
1106          * the backend memory allocation.
1107          */
1108         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1109         if (cmd->sense_reason)
1110                 return 1;
1111
1112         return 0;
1113 }
1114 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1115
1116 static int
1117 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1118                           bool dump_payload)
1119 {
1120         struct iscsi_conn *conn = cmd->conn;
1121         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1122         /*
1123          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1124          */
1125         if (dump_payload)
1126                 goto after_immediate_data;
1127
1128         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1129                                         cmd->first_burst_len);
1130 after_immediate_data:
1131         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1132                 /*
1133                  * A PDU/CmdSN carrying Immediate Data passed
1134                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1135                  * Immediate Bit is not set.
1136                  */
1137                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1138                                         (unsigned char *)hdr, hdr->cmdsn);
1139                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1140                         return -1;
1141
1142                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1143                         int rc;
1144
1145                         rc = iscsit_dump_data_payload(cmd->conn,
1146                                                       cmd->first_burst_len, 1);
1147                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1148                         return rc;
1149                 } else if (cmd->unsolicited_data)
1150                         iscsit_set_unsoliticed_dataout(cmd);
1151
1152         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1153                 /*
1154                  * Immediate Data failed DataCRC and ERL>=1,
1155                  * silently drop this PDU and let the initiator
1156                  * plug the CmdSN gap.
1157                  *
1158                  * FIXME: Send Unsolicited NOPIN with reserved
1159                  * TTT here to help the initiator figure out
1160                  * the missing CmdSN, although they should be
1161                  * intelligent enough to determine the missing
1162                  * CmdSN and issue a retry to plug the sequence.
1163                  */
1164                 cmd->i_state = ISTATE_REMOVE;
1165                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1166         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1167                 return -1;
1168
1169         return 0;
1170 }
1171
1172 static int
1173 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1174                            unsigned char *buf)
1175 {
1176         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1177         int rc, immed_data;
1178         bool dump_payload = false;
1179
1180         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1181         if (rc < 0)
1182                 return 0;
1183         /*
1184          * Allocation iovecs needed for struct socket operations for
1185          * traditional iSCSI block I/O.
1186          */
1187         if (iscsit_allocate_iovecs(cmd) < 0) {
1188                 return iscsit_add_reject_cmd(cmd,
1189                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1190         }
1191         immed_data = cmd->immediate_data;
1192
1193         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1194         if (rc < 0)
1195                 return rc;
1196         else if (rc > 0)
1197                 dump_payload = true;
1198
1199         if (!immed_data)
1200                 return 0;
1201
1202         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1203 }
1204
1205 static u32 iscsit_do_crypto_hash_sg(
1206         struct hash_desc *hash,
1207         struct iscsi_cmd *cmd,
1208         u32 data_offset,
1209         u32 data_length,
1210         u32 padding,
1211         u8 *pad_bytes)
1212 {
1213         u32 data_crc;
1214         u32 i;
1215         struct scatterlist *sg;
1216         unsigned int page_off;
1217
1218         crypto_hash_init(hash);
1219
1220         sg = cmd->first_data_sg;
1221         page_off = cmd->first_data_sg_off;
1222
1223         i = 0;
1224         while (data_length) {
1225                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1226
1227                 crypto_hash_update(hash, &sg[i], cur_len);
1228
1229                 data_length -= cur_len;
1230                 page_off = 0;
1231                 i++;
1232         }
1233
1234         if (padding) {
1235                 struct scatterlist pad_sg;
1236
1237                 sg_init_one(&pad_sg, pad_bytes, padding);
1238                 crypto_hash_update(hash, &pad_sg, padding);
1239         }
1240         crypto_hash_final(hash, (u8 *) &data_crc);
1241
1242         return data_crc;
1243 }
1244
1245 static void iscsit_do_crypto_hash_buf(
1246         struct hash_desc *hash,
1247         const void *buf,
1248         u32 payload_length,
1249         u32 padding,
1250         u8 *pad_bytes,
1251         u8 *data_crc)
1252 {
1253         struct scatterlist sg;
1254
1255         crypto_hash_init(hash);
1256
1257         sg_init_one(&sg, buf, payload_length);
1258         crypto_hash_update(hash, &sg, payload_length);
1259
1260         if (padding) {
1261                 sg_init_one(&sg, pad_bytes, padding);
1262                 crypto_hash_update(hash, &sg, padding);
1263         }
1264         crypto_hash_final(hash, data_crc);
1265 }
1266
1267 int
1268 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1269                           struct iscsi_cmd **out_cmd)
1270 {
1271         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1272         struct iscsi_cmd *cmd = NULL;
1273         struct se_cmd *se_cmd;
1274         u32 payload_length = ntoh24(hdr->dlength);
1275         int rc;
1276
1277         if (!payload_length) {
1278                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1279                 return 0;
1280         }
1281
1282         /* iSCSI write */
1283         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1284
1285         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1286                 pr_err("DataSegmentLength: %u is greater than"
1287                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1288                         conn->conn_ops->MaxXmitDataSegmentLength);
1289                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1290                                          buf);
1291         }
1292
1293         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1294                         payload_length);
1295         if (!cmd)
1296                 return 0;
1297
1298         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1299                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1300                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1301                 payload_length, conn->cid);
1302
1303         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1304                 pr_err("Command ITT: 0x%08x received DataOUT after"
1305                         " last DataOUT received, dumping payload\n",
1306                         cmd->init_task_tag);
1307                 return iscsit_dump_data_payload(conn, payload_length, 1);
1308         }
1309
1310         if (cmd->data_direction != DMA_TO_DEVICE) {
1311                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1312                         " NON-WRITE command.\n", cmd->init_task_tag);
1313                 return iscsit_dump_data_payload(conn, payload_length, 1);
1314         }
1315         se_cmd = &cmd->se_cmd;
1316         iscsit_mod_dataout_timer(cmd);
1317
1318         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1319                 pr_err("DataOut Offset: %u, Length %u greater than"
1320                         " iSCSI Command EDTL %u, protocol error.\n",
1321                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1322                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1323         }
1324
1325         if (cmd->unsolicited_data) {
1326                 int dump_unsolicited_data = 0;
1327
1328                 if (conn->sess->sess_ops->InitialR2T) {
1329                         pr_err("Received unexpected unsolicited data"
1330                                 " while InitialR2T=Yes, protocol error.\n");
1331                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1332                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1333                         return -1;
1334                 }
1335                 /*
1336                  * Special case for dealing with Unsolicited DataOUT
1337                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1338                  * failures;
1339                  */
1340
1341                 /* Something's amiss if we're not in WRITE_PENDING state... */
1342                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1343                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1344                         dump_unsolicited_data = 1;
1345
1346                 if (dump_unsolicited_data) {
1347                         /*
1348                          * Check if a delayed TASK_ABORTED status needs to
1349                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1350                          * received with the unsolicitied data out.
1351                          */
1352                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1353                                 iscsit_stop_dataout_timer(cmd);
1354
1355                         transport_check_aborted_status(se_cmd,
1356                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1357                         return iscsit_dump_data_payload(conn, payload_length, 1);
1358                 }
1359         } else {
1360                 /*
1361                  * For the normal solicited data path:
1362                  *
1363                  * Check for a delayed TASK_ABORTED status and dump any
1364                  * incoming data out payload if one exists.  Also, when the
1365                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1366                  * data out sequence, we decrement outstanding_r2ts.  Once
1367                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1368                  * TASK_ABORTED status.
1369                  */
1370                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1371                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1372                                 if (--cmd->outstanding_r2ts < 1) {
1373                                         iscsit_stop_dataout_timer(cmd);
1374                                         transport_check_aborted_status(
1375                                                         se_cmd, 1);
1376                                 }
1377
1378                         return iscsit_dump_data_payload(conn, payload_length, 1);
1379                 }
1380         }
1381         /*
1382          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1383          * within-command recovery checks before receiving the payload.
1384          */
1385         rc = iscsit_check_pre_dataout(cmd, buf);
1386         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1387                 return 0;
1388         else if (rc == DATAOUT_CANNOT_RECOVER)
1389                 return -1;
1390
1391         *out_cmd = cmd;
1392         return 0;
1393 }
1394 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1395
1396 static int
1397 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1398                    struct iscsi_data *hdr)
1399 {
1400         struct kvec *iov;
1401         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1402         u32 payload_length = ntoh24(hdr->dlength);
1403         int iov_ret, data_crc_failed = 0;
1404
1405         rx_size += payload_length;
1406         iov = &cmd->iov_data[0];
1407
1408         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1409                                    payload_length);
1410         if (iov_ret < 0)
1411                 return -1;
1412
1413         iov_count += iov_ret;
1414
1415         padding = ((-payload_length) & 3);
1416         if (padding != 0) {
1417                 iov[iov_count].iov_base = cmd->pad_bytes;
1418                 iov[iov_count++].iov_len = padding;
1419                 rx_size += padding;
1420                 pr_debug("Receiving %u padding bytes.\n", padding);
1421         }
1422
1423         if (conn->conn_ops->DataDigest) {
1424                 iov[iov_count].iov_base = &checksum;
1425                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1426                 rx_size += ISCSI_CRC_LEN;
1427         }
1428
1429         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1430
1431         iscsit_unmap_iovec(cmd);
1432
1433         if (rx_got != rx_size)
1434                 return -1;
1435
1436         if (conn->conn_ops->DataDigest) {
1437                 u32 data_crc;
1438
1439                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1440                                                     be32_to_cpu(hdr->offset),
1441                                                     payload_length, padding,
1442                                                     cmd->pad_bytes);
1443
1444                 if (checksum != data_crc) {
1445                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1446                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1447                                 " does not match computed 0x%08x\n",
1448                                 hdr->itt, hdr->offset, payload_length,
1449                                 hdr->datasn, checksum, data_crc);
1450                         data_crc_failed = 1;
1451                 } else {
1452                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1453                                 " %u bytes of Data Out\n", checksum,
1454                                 payload_length);
1455                 }
1456         }
1457
1458         return data_crc_failed;
1459 }
1460
1461 int
1462 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1463                              bool data_crc_failed)
1464 {
1465         struct iscsi_conn *conn = cmd->conn;
1466         int rc, ooo_cmdsn;
1467         /*
1468          * Increment post receive data and CRC values or perform
1469          * within-command recovery.
1470          */
1471         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1472         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1473                 return 0;
1474         else if (rc == DATAOUT_SEND_R2T) {
1475                 iscsit_set_dataout_sequence_values(cmd);
1476                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1477         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1478                 /*
1479                  * Handle extra special case for out of order
1480                  * Unsolicited Data Out.
1481                  */
1482                 spin_lock_bh(&cmd->istate_lock);
1483                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1484                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1485                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1486                 spin_unlock_bh(&cmd->istate_lock);
1487
1488                 iscsit_stop_dataout_timer(cmd);
1489                 if (ooo_cmdsn)
1490                         return 0;
1491                 target_execute_cmd(&cmd->se_cmd);
1492                 return 0;
1493         } else /* DATAOUT_CANNOT_RECOVER */
1494                 return -1;
1495
1496         return 0;
1497 }
1498 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1499
1500 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1501 {
1502         struct iscsi_cmd *cmd = NULL;
1503         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1504         int rc;
1505         bool data_crc_failed = false;
1506
1507         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1508         if (rc < 0)
1509                 return 0;
1510         else if (!cmd)
1511                 return 0;
1512
1513         rc = iscsit_get_dataout(conn, cmd, hdr);
1514         if (rc < 0)
1515                 return rc;
1516         else if (rc > 0)
1517                 data_crc_failed = true;
1518
1519         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1520 }
1521
1522 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1523                          struct iscsi_nopout *hdr)
1524 {
1525         u32 payload_length = ntoh24(hdr->dlength);
1526
1527         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1528                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1529                 if (!cmd)
1530                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1531                                                  (unsigned char *)hdr);
1532
1533                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1534                                          (unsigned char *)hdr);
1535         }
1536
1537         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1538                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1539                         " not set, protocol error.\n");
1540                 if (!cmd)
1541                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1542                                                  (unsigned char *)hdr);
1543
1544                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1545                                          (unsigned char *)hdr);
1546         }
1547
1548         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1549                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1550                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1551                         " error.\n", payload_length,
1552                         conn->conn_ops->MaxXmitDataSegmentLength);
1553                 if (!cmd)
1554                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1555                                                  (unsigned char *)hdr);
1556
1557                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1558                                          (unsigned char *)hdr);
1559         }
1560
1561         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1562                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1563                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1564                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1565                 payload_length);
1566         /*
1567          * This is not a response to a Unsolicited NopIN, which means
1568          * it can either be a NOPOUT ping request (with a valid ITT),
1569          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1570          * Either way, make sure we allocate an struct iscsi_cmd, as both
1571          * can contain ping data.
1572          */
1573         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1574                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1575                 cmd->i_state            = ISTATE_SEND_NOPIN;
1576                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1577                                                 1 : 0);
1578                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1579                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1580                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1581                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1582                 cmd->data_direction     = DMA_NONE;
1583         }
1584
1585         return 0;
1586 }
1587 EXPORT_SYMBOL(iscsit_setup_nop_out);
1588
1589 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1590                            struct iscsi_nopout *hdr)
1591 {
1592         struct iscsi_cmd *cmd_p = NULL;
1593         int cmdsn_ret = 0;
1594         /*
1595          * Initiator is expecting a NopIN ping reply..
1596          */
1597         if (hdr->itt != RESERVED_ITT) {
1598                 if (!cmd)
1599                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1600                                                 (unsigned char *)hdr);
1601
1602                 spin_lock_bh(&conn->cmd_lock);
1603                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1604                 spin_unlock_bh(&conn->cmd_lock);
1605
1606                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1607
1608                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1609                         iscsit_add_cmd_to_response_queue(cmd, conn,
1610                                                          cmd->i_state);
1611                         return 0;
1612                 }
1613
1614                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1615                                 (unsigned char *)hdr, hdr->cmdsn);
1616                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1617                         return 0;
1618                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1619                         return -1;
1620
1621                 return 0;
1622         }
1623         /*
1624          * This was a response to a unsolicited NOPIN ping.
1625          */
1626         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1627                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1628                 if (!cmd_p)
1629                         return -EINVAL;
1630
1631                 iscsit_stop_nopin_response_timer(conn);
1632
1633                 cmd_p->i_state = ISTATE_REMOVE;
1634                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1635
1636                 iscsit_start_nopin_timer(conn);
1637                 return 0;
1638         }
1639         /*
1640          * Otherwise, initiator is not expecting a NOPIN is response.
1641          * Just ignore for now.
1642          */
1643         return 0;
1644 }
1645 EXPORT_SYMBOL(iscsit_process_nop_out);
1646
1647 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1648                                  unsigned char *buf)
1649 {
1650         unsigned char *ping_data = NULL;
1651         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1652         struct kvec *iov = NULL;
1653         u32 payload_length = ntoh24(hdr->dlength);
1654         int ret;
1655
1656         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1657         if (ret < 0)
1658                 return 0;
1659         /*
1660          * Handle NOP-OUT payload for traditional iSCSI sockets
1661          */
1662         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1663                 u32 checksum, data_crc, padding = 0;
1664                 int niov = 0, rx_got, rx_size = payload_length;
1665
1666                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1667                 if (!ping_data) {
1668                         pr_err("Unable to allocate memory for"
1669                                 " NOPOUT ping data.\n");
1670                         ret = -1;
1671                         goto out;
1672                 }
1673
1674                 iov = &cmd->iov_misc[0];
1675                 iov[niov].iov_base      = ping_data;
1676                 iov[niov++].iov_len     = payload_length;
1677
1678                 padding = ((-payload_length) & 3);
1679                 if (padding != 0) {
1680                         pr_debug("Receiving %u additional bytes"
1681                                 " for padding.\n", padding);
1682                         iov[niov].iov_base      = &cmd->pad_bytes;
1683                         iov[niov++].iov_len     = padding;
1684                         rx_size += padding;
1685                 }
1686                 if (conn->conn_ops->DataDigest) {
1687                         iov[niov].iov_base      = &checksum;
1688                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1689                         rx_size += ISCSI_CRC_LEN;
1690                 }
1691
1692                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1693                 if (rx_got != rx_size) {
1694                         ret = -1;
1695                         goto out;
1696                 }
1697
1698                 if (conn->conn_ops->DataDigest) {
1699                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1700                                         ping_data, payload_length,
1701                                         padding, cmd->pad_bytes,
1702                                         (u8 *)&data_crc);
1703
1704                         if (checksum != data_crc) {
1705                                 pr_err("Ping data CRC32C DataDigest"
1706                                 " 0x%08x does not match computed 0x%08x\n",
1707                                         checksum, data_crc);
1708                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1709                                         pr_err("Unable to recover from"
1710                                         " NOPOUT Ping DataCRC failure while in"
1711                                                 " ERL=0.\n");
1712                                         ret = -1;
1713                                         goto out;
1714                                 } else {
1715                                         /*
1716                                          * Silently drop this PDU and let the
1717                                          * initiator plug the CmdSN gap.
1718                                          */
1719                                         pr_debug("Dropping NOPOUT"
1720                                         " Command CmdSN: 0x%08x due to"
1721                                         " DataCRC error.\n", hdr->cmdsn);
1722                                         ret = 0;
1723                                         goto out;
1724                                 }
1725                         } else {
1726                                 pr_debug("Got CRC32C DataDigest"
1727                                 " 0x%08x for %u bytes of ping data.\n",
1728                                         checksum, payload_length);
1729                         }
1730                 }
1731
1732                 ping_data[payload_length] = '\0';
1733                 /*
1734                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1735                  */
1736                 cmd->buf_ptr = ping_data;
1737                 cmd->buf_ptr_size = payload_length;
1738
1739                 pr_debug("Got %u bytes of NOPOUT ping"
1740                         " data.\n", payload_length);
1741                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1742         }
1743
1744         return iscsit_process_nop_out(conn, cmd, hdr);
1745 out:
1746         if (cmd)
1747                 iscsit_free_cmd(cmd, false);
1748
1749         kfree(ping_data);
1750         return ret;
1751 }
1752
1753 int
1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1755                            unsigned char *buf)
1756 {
1757         struct se_tmr_req *se_tmr;
1758         struct iscsi_tmr_req *tmr_req;
1759         struct iscsi_tm *hdr;
1760         int out_of_order_cmdsn = 0, ret;
1761         bool sess_ref = false;
1762         u8 function;
1763
1764         hdr                     = (struct iscsi_tm *) buf;
1765         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1766         function = hdr->flags;
1767
1768         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1769                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1770                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1771                 hdr->rtt, hdr->refcmdsn, conn->cid);
1772
1773         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1774             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1775              hdr->rtt != RESERVED_ITT)) {
1776                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1777                 hdr->rtt = RESERVED_ITT;
1778         }
1779
1780         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1781                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1782                 pr_err("Task Management Request TASK_REASSIGN not"
1783                         " issued as immediate command, bad iSCSI Initiator"
1784                                 "implementation\n");
1785                 return iscsit_add_reject_cmd(cmd,
1786                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1787         }
1788         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1789             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1790                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1791
1792         cmd->data_direction = DMA_NONE;
1793
1794         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1795         if (!cmd->tmr_req) {
1796                 pr_err("Unable to allocate memory for"
1797                         " Task Management command!\n");
1798                 return iscsit_add_reject_cmd(cmd,
1799                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1800                                              buf);
1801         }
1802
1803         /*
1804          * TASK_REASSIGN for ERL=2 / connection stays inside of
1805          * LIO-Target $FABRIC_MOD
1806          */
1807         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1808
1809                 u8 tcm_function;
1810                 int ret;
1811
1812                 transport_init_se_cmd(&cmd->se_cmd,
1813                                       &lio_target_fabric_configfs->tf_ops,
1814                                       conn->sess->se_sess, 0, DMA_NONE,
1815                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1816
1817                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1818                 sess_ref = true;
1819
1820                 switch (function) {
1821                 case ISCSI_TM_FUNC_ABORT_TASK:
1822                         tcm_function = TMR_ABORT_TASK;
1823                         break;
1824                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1825                         tcm_function = TMR_ABORT_TASK_SET;
1826                         break;
1827                 case ISCSI_TM_FUNC_CLEAR_ACA:
1828                         tcm_function = TMR_CLEAR_ACA;
1829                         break;
1830                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1831                         tcm_function = TMR_CLEAR_TASK_SET;
1832                         break;
1833                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1834                         tcm_function = TMR_LUN_RESET;
1835                         break;
1836                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1837                         tcm_function = TMR_TARGET_WARM_RESET;
1838                         break;
1839                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1840                         tcm_function = TMR_TARGET_COLD_RESET;
1841                         break;
1842                 default:
1843                         pr_err("Unknown iSCSI TMR Function:"
1844                                " 0x%02x\n", function);
1845                         return iscsit_add_reject_cmd(cmd,
1846                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1847                 }
1848
1849                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1850                                          tcm_function, GFP_KERNEL);
1851                 if (ret < 0)
1852                         return iscsit_add_reject_cmd(cmd,
1853                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1854
1855                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1856         }
1857
1858         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1859         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1860         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1861         cmd->init_task_tag      = hdr->itt;
1862         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1863         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1864         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1865         se_tmr                  = cmd->se_cmd.se_tmr_req;
1866         tmr_req                 = cmd->tmr_req;
1867         /*
1868          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1869          */
1870         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1871                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1872                                                scsilun_to_int(&hdr->lun));
1873                 if (ret < 0) {
1874                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1875                         goto attach;
1876                 }
1877         }
1878
1879         switch (function) {
1880         case ISCSI_TM_FUNC_ABORT_TASK:
1881                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1882                 if (se_tmr->response)
1883                         goto attach;
1884                 break;
1885         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1886         case ISCSI_TM_FUNC_CLEAR_ACA:
1887         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1888         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1889                 break;
1890         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1891                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1892                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1893                         goto attach;
1894                 }
1895                 break;
1896         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1897                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1898                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1899                         goto attach;
1900                 }
1901                 break;
1902         case ISCSI_TM_FUNC_TASK_REASSIGN:
1903                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1904                 /*
1905                  * Perform sanity checks on the ExpDataSN only if the
1906                  * TASK_REASSIGN was successful.
1907                  */
1908                 if (se_tmr->response)
1909                         break;
1910
1911                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1912                         return iscsit_add_reject_cmd(cmd,
1913                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1914                 break;
1915         default:
1916                 pr_err("Unknown TMR function: 0x%02x, protocol"
1917                         " error.\n", function);
1918                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1919                 goto attach;
1920         }
1921
1922         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1923             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1924                 se_tmr->call_transport = 1;
1925 attach:
1926         spin_lock_bh(&conn->cmd_lock);
1927         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1928         spin_unlock_bh(&conn->cmd_lock);
1929
1930         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1931                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1932                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1933                         out_of_order_cmdsn = 1;
1934                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1935                         return 0;
1936                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1937                         return -1;
1938         }
1939         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1940
1941         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1942                 return 0;
1943         /*
1944          * Found the referenced task, send to transport for processing.
1945          */
1946         if (se_tmr->call_transport)
1947                 return transport_generic_handle_tmr(&cmd->se_cmd);
1948
1949         /*
1950          * Could not find the referenced LUN, task, or Task Management
1951          * command not authorized or supported.  Change state and
1952          * let the tx_thread send the response.
1953          *
1954          * For connection recovery, this is also the default action for
1955          * TMR TASK_REASSIGN.
1956          */
1957         if (sess_ref) {
1958                 pr_debug("Handle TMR, using sess_ref=true check\n");
1959                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1960         }
1961
1962         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1963         return 0;
1964 }
1965 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1966
1967 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1968 int
1969 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1970                       struct iscsi_text *hdr)
1971 {
1972         u32 payload_length = ntoh24(hdr->dlength);
1973
1974         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1975                 pr_err("Unable to accept text parameter length: %u"
1976                         "greater than MaxXmitDataSegmentLength %u.\n",
1977                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1978                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1979                                          (unsigned char *)hdr);
1980         }
1981
1982         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1983              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1984                 pr_err("Multi sequence text commands currently not supported\n");
1985                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1986                                         (unsigned char *)hdr);
1987         }
1988
1989         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1990                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1991                 hdr->exp_statsn, payload_length);
1992
1993         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1994         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1995         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1996         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1997         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1998         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1999         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2000         cmd->data_direction     = DMA_NONE;
2001
2002         return 0;
2003 }
2004 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2005
2006 int
2007 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2008                         struct iscsi_text *hdr)
2009 {
2010         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2011         int cmdsn_ret;
2012
2013         if (!text_in) {
2014                 pr_err("Unable to locate text_in buffer for sendtargets"
2015                        " discovery\n");
2016                 goto reject;
2017         }
2018         if (strncmp("SendTargets", text_in, 11) != 0) {
2019                 pr_err("Received Text Data that is not"
2020                         " SendTargets, cannot continue.\n");
2021                 goto reject;
2022         }
2023         text_ptr = strchr(text_in, '=');
2024         if (!text_ptr) {
2025                 pr_err("No \"=\" separator found in Text Data,"
2026                         "  cannot continue.\n");
2027                 goto reject;
2028         }
2029         if (!strncmp("=All", text_ptr, 4)) {
2030                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2031         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2032                    !strncmp("=eui.", text_ptr, 5)) {
2033                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2034         } else {
2035                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2036                 goto reject;
2037         }
2038
2039         spin_lock_bh(&conn->cmd_lock);
2040         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2041         spin_unlock_bh(&conn->cmd_lock);
2042
2043         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2044
2045         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2046                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2047                                 (unsigned char *)hdr, hdr->cmdsn);
2048                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2049                         return -1;
2050
2051                 return 0;
2052         }
2053
2054         return iscsit_execute_cmd(cmd, 0);
2055
2056 reject:
2057         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2058                                  (unsigned char *)hdr);
2059 }
2060 EXPORT_SYMBOL(iscsit_process_text_cmd);
2061
2062 static int
2063 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2064                        unsigned char *buf)
2065 {
2066         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2067         char *text_in = NULL;
2068         u32 payload_length = ntoh24(hdr->dlength);
2069         int rx_size, rc;
2070
2071         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2072         if (rc < 0)
2073                 return 0;
2074
2075         rx_size = payload_length;
2076         if (payload_length) {
2077                 u32 checksum = 0, data_crc = 0;
2078                 u32 padding = 0, pad_bytes = 0;
2079                 int niov = 0, rx_got;
2080                 struct kvec iov[3];
2081
2082                 text_in = kzalloc(payload_length, GFP_KERNEL);
2083                 if (!text_in) {
2084                         pr_err("Unable to allocate memory for"
2085                                 " incoming text parameters\n");
2086                         goto reject;
2087                 }
2088                 cmd->text_in_ptr = text_in;
2089
2090                 memset(iov, 0, 3 * sizeof(struct kvec));
2091                 iov[niov].iov_base      = text_in;
2092                 iov[niov++].iov_len     = payload_length;
2093
2094                 padding = ((-payload_length) & 3);
2095                 if (padding != 0) {
2096                         iov[niov].iov_base = &pad_bytes;
2097                         iov[niov++].iov_len  = padding;
2098                         rx_size += padding;
2099                         pr_debug("Receiving %u additional bytes"
2100                                         " for padding.\n", padding);
2101                 }
2102                 if (conn->conn_ops->DataDigest) {
2103                         iov[niov].iov_base      = &checksum;
2104                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2105                         rx_size += ISCSI_CRC_LEN;
2106                 }
2107
2108                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2109                 if (rx_got != rx_size)
2110                         goto reject;
2111
2112                 if (conn->conn_ops->DataDigest) {
2113                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2114                                         text_in, payload_length,
2115                                         padding, (u8 *)&pad_bytes,
2116                                         (u8 *)&data_crc);
2117
2118                         if (checksum != data_crc) {
2119                                 pr_err("Text data CRC32C DataDigest"
2120                                         " 0x%08x does not match computed"
2121                                         " 0x%08x\n", checksum, data_crc);
2122                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2123                                         pr_err("Unable to recover from"
2124                                         " Text Data digest failure while in"
2125                                                 " ERL=0.\n");
2126                                         goto reject;
2127                                 } else {
2128                                         /*
2129                                          * Silently drop this PDU and let the
2130                                          * initiator plug the CmdSN gap.
2131                                          */
2132                                         pr_debug("Dropping Text"
2133                                         " Command CmdSN: 0x%08x due to"
2134                                         " DataCRC error.\n", hdr->cmdsn);
2135                                         kfree(text_in);
2136                                         return 0;
2137                                 }
2138                         } else {
2139                                 pr_debug("Got CRC32C DataDigest"
2140                                         " 0x%08x for %u bytes of text data.\n",
2141                                                 checksum, payload_length);
2142                         }
2143                 }
2144                 text_in[payload_length - 1] = '\0';
2145                 pr_debug("Successfully read %d bytes of text"
2146                                 " data.\n", payload_length);
2147         }
2148
2149         return iscsit_process_text_cmd(conn, cmd, hdr);
2150
2151 reject:
2152         kfree(cmd->text_in_ptr);
2153         cmd->text_in_ptr = NULL;
2154         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2155 }
2156 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2157
2158 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2159 {
2160         struct iscsi_conn *conn_p;
2161         struct iscsi_session *sess = conn->sess;
2162
2163         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2164                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2165
2166         atomic_set(&sess->session_logout, 1);
2167         atomic_set(&conn->conn_logout_remove, 1);
2168         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2169
2170         iscsit_inc_conn_usage_count(conn);
2171         iscsit_inc_session_usage_count(sess);
2172
2173         spin_lock_bh(&sess->conn_lock);
2174         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2175                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2176                         continue;
2177
2178                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2179                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2180         }
2181         spin_unlock_bh(&sess->conn_lock);
2182
2183         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2184
2185         return 0;
2186 }
2187
2188 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2189 {
2190         struct iscsi_conn *l_conn;
2191         struct iscsi_session *sess = conn->sess;
2192
2193         pr_debug("Received logout request CLOSECONNECTION for CID:"
2194                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2195
2196         /*
2197          * A Logout Request with a CLOSECONNECTION reason code for a CID
2198          * can arrive on a connection with a differing CID.
2199          */
2200         if (conn->cid == cmd->logout_cid) {
2201                 spin_lock_bh(&conn->state_lock);
2202                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2203                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2204
2205                 atomic_set(&conn->conn_logout_remove, 1);
2206                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2207                 iscsit_inc_conn_usage_count(conn);
2208
2209                 spin_unlock_bh(&conn->state_lock);
2210         } else {
2211                 /*
2212                  * Handle all different cid CLOSECONNECTION requests in
2213                  * iscsit_logout_post_handler_diffcid() as to give enough
2214                  * time for any non immediate command's CmdSN to be
2215                  * acknowledged on the connection in question.
2216                  *
2217                  * Here we simply make sure the CID is still around.
2218                  */
2219                 l_conn = iscsit_get_conn_from_cid(sess,
2220                                 cmd->logout_cid);
2221                 if (!l_conn) {
2222                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2223                         iscsit_add_cmd_to_response_queue(cmd, conn,
2224                                         cmd->i_state);
2225                         return 0;
2226                 }
2227
2228                 iscsit_dec_conn_usage_count(l_conn);
2229         }
2230
2231         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2232
2233         return 0;
2234 }
2235
2236 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2237 {
2238         struct iscsi_session *sess = conn->sess;
2239
2240         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2241                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2242
2243         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2244                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2245                         " while ERL!=2.\n");
2246                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2247                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2248                 return 0;
2249         }
2250
2251         if (conn->cid == cmd->logout_cid) {
2252                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2253                         " with CID: %hu on CID: %hu, implementation error.\n",
2254                                 cmd->logout_cid, conn->cid);
2255                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2256                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2257                 return 0;
2258         }
2259
2260         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2261
2262         return 0;
2263 }
2264
2265 int
2266 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2267                         unsigned char *buf)
2268 {
2269         int cmdsn_ret, logout_remove = 0;
2270         u8 reason_code = 0;
2271         struct iscsi_logout *hdr;
2272         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2273
2274         hdr                     = (struct iscsi_logout *) buf;
2275         reason_code             = (hdr->flags & 0x7f);
2276
2277         if (tiqn) {
2278                 spin_lock(&tiqn->logout_stats.lock);
2279                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2280                         tiqn->logout_stats.normal_logouts++;
2281                 else
2282                         tiqn->logout_stats.abnormal_logouts++;
2283                 spin_unlock(&tiqn->logout_stats.lock);
2284         }
2285
2286         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2287                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2288                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2289                 hdr->cid, conn->cid);
2290
2291         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2292                 pr_err("Received logout request on connection that"
2293                         " is not in logged in state, ignoring request.\n");
2294                 iscsit_free_cmd(cmd, false);
2295                 return 0;
2296         }
2297
2298         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2299         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2300         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2301         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2302         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2303         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2304         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2305         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2306         cmd->logout_reason      = reason_code;
2307         cmd->data_direction     = DMA_NONE;
2308
2309         /*
2310          * We need to sleep in these cases (by returning 1) until the Logout
2311          * Response gets sent in the tx thread.
2312          */
2313         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2314            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2315             be16_to_cpu(hdr->cid) == conn->cid))
2316                 logout_remove = 1;
2317
2318         spin_lock_bh(&conn->cmd_lock);
2319         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2320         spin_unlock_bh(&conn->cmd_lock);
2321
2322         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2323                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2324
2325         /*
2326          * Immediate commands are executed, well, immediately.
2327          * Non-Immediate Logout Commands are executed in CmdSN order.
2328          */
2329         if (cmd->immediate_cmd) {
2330                 int ret = iscsit_execute_cmd(cmd, 0);
2331
2332                 if (ret < 0)
2333                         return ret;
2334         } else {
2335                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2336                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2337                         logout_remove = 0;
2338                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2339                         return -1;
2340         }
2341
2342         return logout_remove;
2343 }
2344 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2345
2346 static int iscsit_handle_snack(
2347         struct iscsi_conn *conn,
2348         unsigned char *buf)
2349 {
2350         struct iscsi_snack *hdr;
2351
2352         hdr                     = (struct iscsi_snack *) buf;
2353         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2354
2355         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2356                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2357                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2358                         hdr->begrun, hdr->runlength, conn->cid);
2359
2360         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2361                 pr_err("Initiator sent SNACK request while in"
2362                         " ErrorRecoveryLevel=0.\n");
2363                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2364                                          buf);
2365         }
2366         /*
2367          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2368          * call from inside iscsi_send_recovery_datain_or_r2t().
2369          */
2370         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2371         case 0:
2372                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2373                         hdr->itt,
2374                         be32_to_cpu(hdr->ttt),
2375                         be32_to_cpu(hdr->begrun),
2376                         be32_to_cpu(hdr->runlength));
2377         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2378                 return iscsit_handle_status_snack(conn, hdr->itt,
2379                         be32_to_cpu(hdr->ttt),
2380                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2381         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2382                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2383                         be32_to_cpu(hdr->begrun),
2384                         be32_to_cpu(hdr->runlength));
2385         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2386                 /* FIXME: Support R-Data SNACK */
2387                 pr_err("R-Data SNACK Not Supported.\n");
2388                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2389                                          buf);
2390         default:
2391                 pr_err("Unknown SNACK type 0x%02x, protocol"
2392                         " error.\n", hdr->flags & 0x0f);
2393                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2394                                          buf);
2395         }
2396
2397         return 0;
2398 }
2399
2400 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2401 {
2402         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2403             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2404                 wait_for_completion_interruptible_timeout(
2405                                         &conn->rx_half_close_comp,
2406                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2407         }
2408 }
2409
2410 static int iscsit_handle_immediate_data(
2411         struct iscsi_cmd *cmd,
2412         struct iscsi_scsi_req *hdr,
2413         u32 length)
2414 {
2415         int iov_ret, rx_got = 0, rx_size = 0;
2416         u32 checksum, iov_count = 0, padding = 0;
2417         struct iscsi_conn *conn = cmd->conn;
2418         struct kvec *iov;
2419
2420         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2421         if (iov_ret < 0)
2422                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2423
2424         rx_size = length;
2425         iov_count = iov_ret;
2426         iov = &cmd->iov_data[0];
2427
2428         padding = ((-length) & 3);
2429         if (padding != 0) {
2430                 iov[iov_count].iov_base = cmd->pad_bytes;
2431                 iov[iov_count++].iov_len = padding;
2432                 rx_size += padding;
2433         }
2434
2435         if (conn->conn_ops->DataDigest) {
2436                 iov[iov_count].iov_base         = &checksum;
2437                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2438                 rx_size += ISCSI_CRC_LEN;
2439         }
2440
2441         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2442
2443         iscsit_unmap_iovec(cmd);
2444
2445         if (rx_got != rx_size) {
2446                 iscsit_rx_thread_wait_for_tcp(conn);
2447                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2448         }
2449
2450         if (conn->conn_ops->DataDigest) {
2451                 u32 data_crc;
2452
2453                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2454                                                     cmd->write_data_done, length, padding,
2455                                                     cmd->pad_bytes);
2456
2457                 if (checksum != data_crc) {
2458                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2459                                 " does not match computed 0x%08x\n", checksum,
2460                                 data_crc);
2461
2462                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2463                                 pr_err("Unable to recover from"
2464                                         " Immediate Data digest failure while"
2465                                         " in ERL=0.\n");
2466                                 iscsit_reject_cmd(cmd,
2467                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2468                                                 (unsigned char *)hdr);
2469                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2470                         } else {
2471                                 iscsit_reject_cmd(cmd,
2472                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2473                                                 (unsigned char *)hdr);
2474                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2475                         }
2476                 } else {
2477                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2478                                 " %u bytes of Immediate Data\n", checksum,
2479                                 length);
2480                 }
2481         }
2482
2483         cmd->write_data_done += length;
2484
2485         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2486                 spin_lock_bh(&cmd->istate_lock);
2487                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2488                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2489                 spin_unlock_bh(&cmd->istate_lock);
2490         }
2491
2492         return IMMEDIATE_DATA_NORMAL_OPERATION;
2493 }
2494
2495 /*
2496  *      Called with sess->conn_lock held.
2497  */
2498 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2499         with active network interface */
2500 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2501 {
2502         struct iscsi_cmd *cmd;
2503         struct iscsi_conn *conn_p;
2504         bool found = false;
2505
2506         /*
2507          * Only send a Asynchronous Message on connections whos network
2508          * interface is still functional.
2509          */
2510         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2511                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2512                         iscsit_inc_conn_usage_count(conn_p);
2513                         found = true;
2514                         break;
2515                 }
2516         }
2517
2518         if (!found)
2519                 return;
2520
2521         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2522         if (!cmd) {
2523                 iscsit_dec_conn_usage_count(conn_p);
2524                 return;
2525         }
2526
2527         cmd->logout_cid = conn->cid;
2528         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2529         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2530
2531         spin_lock_bh(&conn_p->cmd_lock);
2532         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2533         spin_unlock_bh(&conn_p->cmd_lock);
2534
2535         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2536         iscsit_dec_conn_usage_count(conn_p);
2537 }
2538
2539 static int iscsit_send_conn_drop_async_message(
2540         struct iscsi_cmd *cmd,
2541         struct iscsi_conn *conn)
2542 {
2543         struct iscsi_async *hdr;
2544
2545         cmd->tx_size = ISCSI_HDR_LEN;
2546         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2547
2548         hdr                     = (struct iscsi_async *) cmd->pdu;
2549         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2550         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2551         cmd->init_task_tag      = RESERVED_ITT;
2552         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2553         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2554         cmd->stat_sn            = conn->stat_sn++;
2555         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2556         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2557         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2558         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2559         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2560         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2561         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2562
2563         if (conn->conn_ops->HeaderDigest) {
2564                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2565
2566                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2567                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2568
2569                 cmd->tx_size += ISCSI_CRC_LEN;
2570                 pr_debug("Attaching CRC32C HeaderDigest to"
2571                         " Async Message 0x%08x\n", *header_digest);
2572         }
2573
2574         cmd->iov_misc[0].iov_base       = cmd->pdu;
2575         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2576         cmd->iov_misc_count             = 1;
2577
2578         pr_debug("Sending Connection Dropped Async Message StatSN:"
2579                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2580                         cmd->logout_cid, conn->cid);
2581         return 0;
2582 }
2583
2584 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2585 {
2586         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2587             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2588                 wait_for_completion_interruptible_timeout(
2589                                         &conn->tx_half_close_comp,
2590                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2591         }
2592 }
2593
2594 static void
2595 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2596                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2597                         bool set_statsn)
2598 {
2599         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2600         hdr->flags              = datain->flags;
2601         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2602                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2603                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2604                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2605                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2606                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2607                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2608                 }
2609         }
2610         hton24(hdr->dlength, datain->length);
2611         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2612                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2613                                 (struct scsi_lun *)&hdr->lun);
2614         else
2615                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2616
2617         hdr->itt                = cmd->init_task_tag;
2618
2619         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2620                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2621         else
2622                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2623         if (set_statsn)
2624                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2625         else
2626                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2627
2628         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2629         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2630         hdr->datasn             = cpu_to_be32(datain->data_sn);
2631         hdr->offset             = cpu_to_be32(datain->offset);
2632
2633         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2634                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2635                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2636                 ntohl(hdr->offset), datain->length, conn->cid);
2637 }
2638
2639 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2640 {
2641         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2642         struct iscsi_datain datain;
2643         struct iscsi_datain_req *dr;
2644         struct kvec *iov;
2645         u32 iov_count = 0, tx_size = 0;
2646         int eodr = 0, ret, iov_ret;
2647         bool set_statsn = false;
2648
2649         memset(&datain, 0, sizeof(struct iscsi_datain));
2650         dr = iscsit_get_datain_values(cmd, &datain);
2651         if (!dr) {
2652                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2653                                 cmd->init_task_tag);
2654                 return -1;
2655         }
2656         /*
2657          * Be paranoid and double check the logic for now.
2658          */
2659         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2660                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2661                         " datain.length: %u exceeds cmd->data_length: %u\n",
2662                         cmd->init_task_tag, datain.offset, datain.length,
2663                         cmd->se_cmd.data_length);
2664                 return -1;
2665         }
2666
2667         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2668         /*
2669          * Special case for successfully execution w/ both DATAIN
2670          * and Sense Data.
2671          */
2672         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2673             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2674                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2675         else {
2676                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2677                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2678                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2679                         cmd->stat_sn = conn->stat_sn++;
2680                         set_statsn = true;
2681                 } else if (dr->dr_complete ==
2682                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2683                         set_statsn = true;
2684         }
2685
2686         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2687
2688         iov = &cmd->iov_data[0];
2689         iov[iov_count].iov_base = cmd->pdu;
2690         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2691         tx_size += ISCSI_HDR_LEN;
2692
2693         if (conn->conn_ops->HeaderDigest) {
2694                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2695
2696                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2697                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2698
2699                 iov[0].iov_len += ISCSI_CRC_LEN;
2700                 tx_size += ISCSI_CRC_LEN;
2701
2702                 pr_debug("Attaching CRC32 HeaderDigest"
2703                         " for DataIN PDU 0x%08x\n", *header_digest);
2704         }
2705
2706         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2707                                 datain.offset, datain.length);
2708         if (iov_ret < 0)
2709                 return -1;
2710
2711         iov_count += iov_ret;
2712         tx_size += datain.length;
2713
2714         cmd->padding = ((-datain.length) & 3);
2715         if (cmd->padding) {
2716                 iov[iov_count].iov_base         = cmd->pad_bytes;
2717                 iov[iov_count++].iov_len        = cmd->padding;
2718                 tx_size += cmd->padding;
2719
2720                 pr_debug("Attaching %u padding bytes\n",
2721                                 cmd->padding);
2722         }
2723         if (conn->conn_ops->DataDigest) {
2724                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2725                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2726
2727                 iov[iov_count].iov_base = &cmd->data_crc;
2728                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2729                 tx_size += ISCSI_CRC_LEN;
2730
2731                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2732                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2733         }
2734
2735         cmd->iov_data_count = iov_count;
2736         cmd->tx_size = tx_size;
2737
2738         /* sendpage is preferred but can't insert markers */
2739         if (!conn->conn_ops->IFMarker)
2740                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2741         else
2742                 ret = iscsit_send_tx_data(cmd, conn, 0);
2743
2744         iscsit_unmap_iovec(cmd);
2745
2746         if (ret < 0) {
2747                 iscsit_tx_thread_wait_for_tcp(conn);
2748                 return ret;
2749         }
2750
2751         if (dr->dr_complete) {
2752                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2753                                 2 : 1;
2754                 iscsit_free_datain_req(cmd, dr);
2755         }
2756
2757         return eodr;
2758 }
2759
2760 int
2761 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2762                         struct iscsi_logout_rsp *hdr)
2763 {
2764         struct iscsi_conn *logout_conn = NULL;
2765         struct iscsi_conn_recovery *cr = NULL;
2766         struct iscsi_session *sess = conn->sess;
2767         /*
2768          * The actual shutting down of Sessions and/or Connections
2769          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2770          * is done in scsi_logout_post_handler().
2771          */
2772         switch (cmd->logout_reason) {
2773         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2774                 pr_debug("iSCSI session logout successful, setting"
2775                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2776                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2777                 break;
2778         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2779                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2780                         break;
2781                 /*
2782                  * For CLOSECONNECTION logout requests carrying
2783                  * a matching logout CID -> local CID, the reference
2784                  * for the local CID will have been incremented in
2785                  * iscsi_logout_closeconnection().
2786                  *
2787                  * For CLOSECONNECTION logout requests carrying
2788                  * a different CID than the connection it arrived
2789                  * on, the connection responding to cmd->logout_cid
2790                  * is stopped in iscsit_logout_post_handler_diffcid().
2791                  */
2792
2793                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2794                         " successful.\n", cmd->logout_cid, conn->cid);
2795                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2796                 break;
2797         case ISCSI_LOGOUT_REASON_RECOVERY:
2798                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2799                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2800                         break;
2801                 /*
2802                  * If the connection is still active from our point of view
2803                  * force connection recovery to occur.
2804                  */
2805                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2806                                 cmd->logout_cid);
2807                 if (logout_conn) {
2808                         iscsit_connection_reinstatement_rcfr(logout_conn);
2809                         iscsit_dec_conn_usage_count(logout_conn);
2810                 }
2811
2812                 cr = iscsit_get_inactive_connection_recovery_entry(
2813                                 conn->sess, cmd->logout_cid);
2814                 if (!cr) {
2815                         pr_err("Unable to locate CID: %hu for"
2816                         " REMOVECONNFORRECOVERY Logout Request.\n",
2817                                 cmd->logout_cid);
2818                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2819                         break;
2820                 }
2821
2822                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2823
2824                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2825                         " for recovery for CID: %hu on CID: %hu successful.\n",
2826                                 cmd->logout_cid, conn->cid);
2827                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2828                 break;
2829         default:
2830                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2831                                 cmd->logout_reason);
2832                 return -1;
2833         }
2834
2835         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2836         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2837         hdr->response           = cmd->logout_response;
2838         hdr->itt                = cmd->init_task_tag;
2839         cmd->stat_sn            = conn->stat_sn++;
2840         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2841
2842         iscsit_increment_maxcmdsn(cmd, conn->sess);
2843         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2844         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2845
2846         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2847                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2848                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2849                 cmd->logout_cid, conn->cid);
2850
2851         return 0;
2852 }
2853 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2854
2855 static int
2856 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2857 {
2858         struct kvec *iov;
2859         int niov = 0, tx_size, rc;
2860
2861         rc = iscsit_build_logout_rsp(cmd, conn,
2862                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2863         if (rc < 0)
2864                 return rc;
2865
2866         tx_size = ISCSI_HDR_LEN;
2867         iov = &cmd->iov_misc[0];
2868         iov[niov].iov_base      = cmd->pdu;
2869         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2870
2871         if (conn->conn_ops->HeaderDigest) {
2872                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2873
2874                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2875                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2876
2877                 iov[0].iov_len += ISCSI_CRC_LEN;
2878                 tx_size += ISCSI_CRC_LEN;
2879                 pr_debug("Attaching CRC32C HeaderDigest to"
2880                         " Logout Response 0x%08x\n", *header_digest);
2881         }
2882         cmd->iov_misc_count = niov;
2883         cmd->tx_size = tx_size;
2884
2885         return 0;
2886 }
2887
2888 void
2889 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2890                        struct iscsi_nopin *hdr, bool nopout_response)
2891 {
2892         hdr->opcode             = ISCSI_OP_NOOP_IN;
2893         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2894         hton24(hdr->dlength, cmd->buf_ptr_size);
2895         if (nopout_response)
2896                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2897         hdr->itt                = cmd->init_task_tag;
2898         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2899         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2900                                   conn->stat_sn;
2901         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2902
2903         if (nopout_response)
2904                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2905
2906         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2907         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2908
2909         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2910                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2911                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2912                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2913 }
2914 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2915
2916 /*
2917  *      Unsolicited NOPIN, either requesting a response or not.
2918  */
2919 static int iscsit_send_unsolicited_nopin(
2920         struct iscsi_cmd *cmd,
2921         struct iscsi_conn *conn,
2922         int want_response)
2923 {
2924         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2925         int tx_size = ISCSI_HDR_LEN, ret;
2926
2927         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2928
2929         if (conn->conn_ops->HeaderDigest) {
2930                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2931
2932                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2933                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2934
2935                 tx_size += ISCSI_CRC_LEN;
2936                 pr_debug("Attaching CRC32C HeaderDigest to"
2937                         " NopIN 0x%08x\n", *header_digest);
2938         }
2939
2940         cmd->iov_misc[0].iov_base       = cmd->pdu;
2941         cmd->iov_misc[0].iov_len        = tx_size;
2942         cmd->iov_misc_count     = 1;
2943         cmd->tx_size            = tx_size;
2944
2945         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2946                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2947
2948         ret = iscsit_send_tx_data(cmd, conn, 1);
2949         if (ret < 0) {
2950                 iscsit_tx_thread_wait_for_tcp(conn);
2951                 return ret;
2952         }
2953
2954         spin_lock_bh(&cmd->istate_lock);
2955         cmd->i_state = want_response ?
2956                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2957         spin_unlock_bh(&cmd->istate_lock);
2958
2959         return 0;
2960 }
2961
2962 static int
2963 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2964 {
2965         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2966         struct kvec *iov;
2967         u32 padding = 0;
2968         int niov = 0, tx_size;
2969
2970         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2971
2972         tx_size = ISCSI_HDR_LEN;
2973         iov = &cmd->iov_misc[0];
2974         iov[niov].iov_base      = cmd->pdu;
2975         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2976
2977         if (conn->conn_ops->HeaderDigest) {
2978                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2979
2980                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2981                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2982
2983                 iov[0].iov_len += ISCSI_CRC_LEN;
2984                 tx_size += ISCSI_CRC_LEN;
2985                 pr_debug("Attaching CRC32C HeaderDigest"
2986                         " to NopIn 0x%08x\n", *header_digest);
2987         }
2988
2989         /*
2990          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2991          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2992          */
2993         if (cmd->buf_ptr_size) {
2994                 iov[niov].iov_base      = cmd->buf_ptr;
2995                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2996                 tx_size += cmd->buf_ptr_size;
2997
2998                 pr_debug("Echoing back %u bytes of ping"
2999                         " data.\n", cmd->buf_ptr_size);
3000
3001                 padding = ((-cmd->buf_ptr_size) & 3);
3002                 if (padding != 0) {
3003                         iov[niov].iov_base = &cmd->pad_bytes;
3004                         iov[niov++].iov_len = padding;
3005                         tx_size += padding;
3006                         pr_debug("Attaching %u additional"
3007                                 " padding bytes.\n", padding);
3008                 }
3009                 if (conn->conn_ops->DataDigest) {
3010                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3011                                 cmd->buf_ptr, cmd->buf_ptr_size,
3012                                 padding, (u8 *)&cmd->pad_bytes,
3013                                 (u8 *)&cmd->data_crc);
3014
3015                         iov[niov].iov_base = &cmd->data_crc;
3016                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3017                         tx_size += ISCSI_CRC_LEN;
3018                         pr_debug("Attached DataDigest for %u"
3019                                 " bytes of ping data, CRC 0x%08x\n",
3020                                 cmd->buf_ptr_size, cmd->data_crc);
3021                 }
3022         }
3023
3024         cmd->iov_misc_count = niov;
3025         cmd->tx_size = tx_size;
3026
3027         return 0;
3028 }
3029
3030 static int iscsit_send_r2t(
3031         struct iscsi_cmd *cmd,
3032         struct iscsi_conn *conn)
3033 {
3034         int tx_size = 0;
3035         struct iscsi_r2t *r2t;
3036         struct iscsi_r2t_rsp *hdr;
3037         int ret;
3038
3039         r2t = iscsit_get_r2t_from_list(cmd);
3040         if (!r2t)
3041                 return -1;
3042
3043         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3044         memset(hdr, 0, ISCSI_HDR_LEN);
3045         hdr->opcode             = ISCSI_OP_R2T;
3046         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3047         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3048                         (struct scsi_lun *)&hdr->lun);
3049         hdr->itt                = cmd->init_task_tag;
3050         spin_lock_bh(&conn->sess->ttt_lock);
3051         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3052         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3053                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3054         spin_unlock_bh(&conn->sess->ttt_lock);
3055         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3056         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3057         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3058         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3059         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3060         hdr->data_offset        = cpu_to_be32(r2t->offset);
3061         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3062
3063         cmd->iov_misc[0].iov_base       = cmd->pdu;
3064         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3065         tx_size += ISCSI_HDR_LEN;
3066
3067         if (conn->conn_ops->HeaderDigest) {
3068                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3069
3070                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3071                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3072
3073                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3074                 tx_size += ISCSI_CRC_LEN;
3075                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3076                         " PDU 0x%08x\n", *header_digest);
3077         }
3078
3079         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3080                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3081                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3082                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3083                         r2t->offset, r2t->xfer_len, conn->cid);
3084
3085         cmd->iov_misc_count = 1;
3086         cmd->tx_size = tx_size;
3087
3088         spin_lock_bh(&cmd->r2t_lock);
3089         r2t->sent_r2t = 1;
3090         spin_unlock_bh(&cmd->r2t_lock);
3091
3092         ret = iscsit_send_tx_data(cmd, conn, 1);
3093         if (ret < 0) {
3094                 iscsit_tx_thread_wait_for_tcp(conn);
3095                 return ret;
3096         }
3097
3098         spin_lock_bh(&cmd->dataout_timeout_lock);
3099         iscsit_start_dataout_timer(cmd, conn);
3100         spin_unlock_bh(&cmd->dataout_timeout_lock);
3101
3102         return 0;
3103 }
3104
3105 /*
3106  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3107  *              connection recovery.
3108  */
3109 int iscsit_build_r2ts_for_cmd(
3110         struct iscsi_conn *conn,
3111         struct iscsi_cmd *cmd,
3112         bool recovery)
3113 {
3114         int first_r2t = 1;
3115         u32 offset = 0, xfer_len = 0;
3116
3117         spin_lock_bh(&cmd->r2t_lock);
3118         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3119                 spin_unlock_bh(&cmd->r2t_lock);
3120                 return 0;
3121         }
3122
3123         if (conn->sess->sess_ops->DataSequenceInOrder &&
3124             !recovery)
3125                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3126
3127         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3128                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3129                         offset = cmd->r2t_offset;
3130
3131                         if (first_r2t && recovery) {
3132                                 int new_data_end = offset +
3133                                         conn->sess->sess_ops->MaxBurstLength -
3134                                         cmd->next_burst_len;
3135
3136                                 if (new_data_end > cmd->se_cmd.data_length)
3137                                         xfer_len = cmd->se_cmd.data_length - offset;
3138                                 else
3139                                         xfer_len =
3140                                                 conn->sess->sess_ops->MaxBurstLength -
3141                                                 cmd->next_burst_len;
3142                         } else {
3143                                 int new_data_end = offset +
3144                                         conn->sess->sess_ops->MaxBurstLength;
3145
3146                                 if (new_data_end > cmd->se_cmd.data_length)
3147                                         xfer_len = cmd->se_cmd.data_length - offset;
3148                                 else
3149                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3150                         }
3151                         cmd->r2t_offset += xfer_len;
3152
3153                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3154                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3155                 } else {
3156                         struct iscsi_seq *seq;
3157
3158                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3159                         if (!seq) {
3160                                 spin_unlock_bh(&cmd->r2t_lock);
3161                                 return -1;
3162                         }
3163
3164                         offset = seq->offset;
3165                         xfer_len = seq->xfer_len;
3166
3167                         if (cmd->seq_send_order == cmd->seq_count)
3168                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3169                 }
3170                 cmd->outstanding_r2ts++;
3171                 first_r2t = 0;
3172
3173                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3174                         spin_unlock_bh(&cmd->r2t_lock);
3175                         return -1;
3176                 }
3177
3178                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3179                         break;
3180         }
3181         spin_unlock_bh(&cmd->r2t_lock);
3182
3183         return 0;
3184 }
3185
3186 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3187                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3188 {
3189         if (inc_stat_sn)
3190                 cmd->stat_sn = conn->stat_sn++;
3191
3192         atomic_long_inc(&conn->sess->rsp_pdus);
3193
3194         memset(hdr, 0, ISCSI_HDR_LEN);
3195         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3196         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3197         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3198                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3199                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3200         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3201                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3202                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3203         }
3204         hdr->response           = cmd->iscsi_response;
3205         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3206         hdr->itt                = cmd->init_task_tag;
3207         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3208
3209         iscsit_increment_maxcmdsn(cmd, conn->sess);
3210         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3211         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3212
3213         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3214                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3215                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3216                 cmd->se_cmd.scsi_status, conn->cid);
3217 }
3218 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3219
3220 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3221 {
3222         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3223         struct kvec *iov;
3224         u32 padding = 0, tx_size = 0;
3225         int iov_count = 0;
3226         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3227
3228         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3229
3230         iov = &cmd->iov_misc[0];
3231         iov[iov_count].iov_base = cmd->pdu;
3232         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3233         tx_size += ISCSI_HDR_LEN;
3234
3235         /*
3236          * Attach SENSE DATA payload to iSCSI Response PDU
3237          */
3238         if (cmd->se_cmd.sense_buffer &&
3239            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3240             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3241                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3242                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3243
3244                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3245                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3246                 iov[iov_count].iov_base = cmd->sense_buffer;
3247                 iov[iov_count++].iov_len =
3248                                 (cmd->se_cmd.scsi_sense_length + padding);
3249                 tx_size += cmd->se_cmd.scsi_sense_length;
3250
3251                 if (padding) {
3252                         memset(cmd->sense_buffer +
3253                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3254                         tx_size += padding;
3255                         pr_debug("Adding %u bytes of padding to"
3256                                 " SENSE.\n", padding);
3257                 }
3258
3259                 if (conn->conn_ops->DataDigest) {
3260                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3261                                 cmd->sense_buffer,
3262                                 (cmd->se_cmd.scsi_sense_length + padding),
3263                                 0, NULL, (u8 *)&cmd->data_crc);
3264
3265                         iov[iov_count].iov_base    = &cmd->data_crc;
3266                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3267                         tx_size += ISCSI_CRC_LEN;
3268
3269                         pr_debug("Attaching CRC32 DataDigest for"
3270                                 " SENSE, %u bytes CRC 0x%08x\n",
3271                                 (cmd->se_cmd.scsi_sense_length + padding),
3272                                 cmd->data_crc);
3273                 }
3274
3275                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3276                                 " Response PDU\n",
3277                                 cmd->se_cmd.scsi_sense_length);
3278         }
3279
3280         if (conn->conn_ops->HeaderDigest) {
3281                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3282
3283                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3284                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3285
3286                 iov[0].iov_len += ISCSI_CRC_LEN;
3287                 tx_size += ISCSI_CRC_LEN;
3288                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3289                                 " PDU 0x%08x\n", *header_digest);
3290         }
3291
3292         cmd->iov_misc_count = iov_count;
3293         cmd->tx_size = tx_size;
3294
3295         return 0;
3296 }
3297
3298 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3299 {
3300         switch (se_tmr->response) {
3301         case TMR_FUNCTION_COMPLETE:
3302                 return ISCSI_TMF_RSP_COMPLETE;
3303         case TMR_TASK_DOES_NOT_EXIST:
3304                 return ISCSI_TMF_RSP_NO_TASK;
3305         case TMR_LUN_DOES_NOT_EXIST:
3306                 return ISCSI_TMF_RSP_NO_LUN;
3307         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3308                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3309         case TMR_FUNCTION_REJECTED:
3310         default:
3311                 return ISCSI_TMF_RSP_REJECTED;
3312         }
3313 }
3314
3315 void
3316 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3317                           struct iscsi_tm_rsp *hdr)
3318 {
3319         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3320
3321         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3322         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3323         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3324         hdr->itt                = cmd->init_task_tag;
3325         cmd->stat_sn            = conn->stat_sn++;
3326         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3327
3328         iscsit_increment_maxcmdsn(cmd, conn->sess);
3329         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3330         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3331
3332         pr_debug("Built Task Management Response ITT: 0x%08x,"
3333                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3334                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3335 }
3336 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3337
3338 static int
3339 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3340 {
3341         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3342         u32 tx_size = 0;
3343
3344         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3345
3346         cmd->iov_misc[0].iov_base       = cmd->pdu;
3347         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3348         tx_size += ISCSI_HDR_LEN;
3349
3350         if (conn->conn_ops->HeaderDigest) {
3351                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3352
3353                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3354                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3355
3356                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3357                 tx_size += ISCSI_CRC_LEN;
3358                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3359                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3360         }
3361
3362         cmd->iov_misc_count = 1;
3363         cmd->tx_size = tx_size;
3364
3365         return 0;
3366 }
3367
3368 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3369 {
3370         bool ret = false;
3371
3372         if (np->np_sockaddr.ss_family == AF_INET6) {
3373                 const struct sockaddr_in6 sin6 = {
3374                         .sin6_addr = IN6ADDR_ANY_INIT };
3375                 struct sockaddr_in6 *sock_in6 =
3376                          (struct sockaddr_in6 *)&np->np_sockaddr;
3377
3378                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3379                                 sin6.sin6_addr.s6_addr, 16))
3380                         ret = true;
3381         } else {
3382                 struct sockaddr_in * sock_in =
3383                         (struct sockaddr_in *)&np->np_sockaddr;
3384
3385                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3386                         ret = true;
3387         }
3388
3389         return ret;
3390 }
3391
3392 #define SENDTARGETS_BUF_LIMIT 32768U
3393
3394 static int
3395 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3396                                   enum iscsit_transport_type network_transport)
3397 {
3398         char *payload = NULL;
3399         struct iscsi_conn *conn = cmd->conn;
3400         struct iscsi_portal_group *tpg;
3401         struct iscsi_tiqn *tiqn;
3402         struct iscsi_tpg_np *tpg_np;
3403         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3404         int target_name_printed;
3405         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3406         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3407
3408         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3409                          SENDTARGETS_BUF_LIMIT);
3410
3411         payload = kzalloc(buffer_len, GFP_KERNEL);
3412         if (!payload) {
3413                 pr_err("Unable to allocate memory for sendtargets"
3414                                 " response.\n");
3415                 return -ENOMEM;
3416         }
3417         /*
3418          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3419          * explicit case..
3420          */
3421         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3422                 text_ptr = strchr(text_in, '=');
3423                 if (!text_ptr) {
3424                         pr_err("Unable to locate '=' string in text_in:"
3425                                " %s\n", text_in);
3426                         kfree(payload);
3427                         return -EINVAL;
3428                 }
3429                 /*
3430                  * Skip over '=' character..
3431                  */
3432                 text_ptr += 1;
3433         }
3434
3435         spin_lock(&tiqn_lock);
3436         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3437                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3438                      strcmp(tiqn->tiqn, text_ptr)) {
3439                         continue;
3440                 }
3441
3442                 target_name_printed = 0;
3443
3444                 spin_lock(&tiqn->tiqn_tpg_lock);
3445                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3446
3447                         /* If demo_mode_discovery=0 and generate_node_acls=0
3448                          * (demo mode dislabed) do not return
3449                          * TargetName+TargetAddress unless a NodeACL exists.
3450                          */
3451
3452                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3453                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3454                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3455                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3456                                 continue;
3457                         }
3458
3459                         spin_lock(&tpg->tpg_state_lock);
3460                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3461                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3462                                 spin_unlock(&tpg->tpg_state_lock);
3463                                 continue;
3464                         }
3465                         spin_unlock(&tpg->tpg_state_lock);
3466
3467                         spin_lock(&tpg->tpg_np_lock);
3468                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3469                                                 tpg_np_list) {
3470                                 struct iscsi_np *np = tpg_np->tpg_np;
3471                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3472
3473                                 if (np->np_network_transport != network_transport)
3474                                         continue;
3475
3476                                 if (!target_name_printed) {
3477                                         len = sprintf(buf, "TargetName=%s",
3478                                                       tiqn->tiqn);
3479                                         len += 1;
3480
3481                                         if ((len + payload_len) > buffer_len) {
3482                                                 spin_unlock(&tpg->tpg_np_lock);
3483                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3484                                                 end_of_buf = 1;
3485                                                 goto eob;
3486                                         }
3487                                         memcpy(payload + payload_len, buf, len);
3488                                         payload_len += len;
3489                                         target_name_printed = 1;
3490                                 }
3491
3492                                 len = sprintf(buf, "TargetAddress="
3493                                         "%s:%hu,%hu",
3494                                         inaddr_any ? conn->local_ip : np->np_ip,
3495                                         np->np_port,
3496                                         tpg->tpgt);
3497                                 len += 1;
3498
3499                                 if ((len + payload_len) > buffer_len) {
3500                                         spin_unlock(&tpg->tpg_np_lock);
3501                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3502                                         end_of_buf = 1;
3503                                         goto eob;
3504                                 }
3505                                 memcpy(payload + payload_len, buf, len);
3506                                 payload_len += len;
3507                         }
3508                         spin_unlock(&tpg->tpg_np_lock);
3509                 }
3510                 spin_unlock(&tiqn->tiqn_tpg_lock);
3511 eob:
3512                 if (end_of_buf)
3513                         break;
3514
3515                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3516                         break;
3517         }
3518         spin_unlock(&tiqn_lock);
3519
3520         cmd->buf_ptr = payload;
3521
3522         return payload_len;
3523 }
3524
3525 int
3526 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3527                       struct iscsi_text_rsp *hdr,
3528                       enum iscsit_transport_type network_transport)
3529 {
3530         int text_length, padding;
3531
3532         text_length = iscsit_build_sendtargets_response(cmd, network_transport);
3533         if (text_length < 0)
3534                 return text_length;
3535
3536         hdr->opcode = ISCSI_OP_TEXT_RSP;
3537         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3538         padding = ((-text_length) & 3);
3539         hton24(hdr->dlength, text_length);
3540         hdr->itt = cmd->init_task_tag;
3541         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3542         cmd->stat_sn = conn->stat_sn++;
3543         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3544
3545         iscsit_increment_maxcmdsn(cmd, conn->sess);
3546         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3547         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3548
3549         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3550                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3551                 text_length, conn->cid);
3552
3553         return text_length + padding;
3554 }
3555 EXPORT_SYMBOL(iscsit_build_text_rsp);
3556
3557 /*
3558  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3559  *      MaxRecvDataSegmentLength.
3560  */
3561 static int iscsit_send_text_rsp(
3562         struct iscsi_cmd *cmd,
3563         struct iscsi_conn *conn)
3564 {
3565         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3566         struct kvec *iov;
3567         u32 tx_size = 0;
3568         int text_length, iov_count = 0, rc;
3569
3570         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3571         if (rc < 0)
3572                 return rc;
3573
3574         text_length = rc;
3575         iov = &cmd->iov_misc[0];
3576         iov[iov_count].iov_base = cmd->pdu;
3577         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3578         iov[iov_count].iov_base = cmd->buf_ptr;
3579         iov[iov_count++].iov_len = text_length;
3580
3581         tx_size += (ISCSI_HDR_LEN + text_length);
3582
3583         if (conn->conn_ops->HeaderDigest) {
3584                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3585
3586                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3587                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3588
3589                 iov[0].iov_len += ISCSI_CRC_LEN;
3590                 tx_size += ISCSI_CRC_LEN;
3591                 pr_debug("Attaching CRC32 HeaderDigest for"
3592                         " Text Response PDU 0x%08x\n", *header_digest);
3593         }
3594
3595         if (conn->conn_ops->DataDigest) {
3596                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3597                                 cmd->buf_ptr, text_length,
3598                                 0, NULL, (u8 *)&cmd->data_crc);
3599
3600                 iov[iov_count].iov_base = &cmd->data_crc;
3601                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3602                 tx_size += ISCSI_CRC_LEN;
3603
3604                 pr_debug("Attaching DataDigest for %u bytes of text"
3605                         " data, CRC 0x%08x\n", text_length,
3606                         cmd->data_crc);
3607         }
3608
3609         cmd->iov_misc_count = iov_count;
3610         cmd->tx_size = tx_size;
3611
3612         return 0;
3613 }
3614
3615 void
3616 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3617                     struct iscsi_reject *hdr)
3618 {
3619         hdr->opcode             = ISCSI_OP_REJECT;
3620         hdr->reason             = cmd->reject_reason;
3621         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3622         hton24(hdr->dlength, ISCSI_HDR_LEN);
3623         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3624         cmd->stat_sn            = conn->stat_sn++;
3625         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3626         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3627         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3628
3629 }
3630 EXPORT_SYMBOL(iscsit_build_reject);
3631
3632 static int iscsit_send_reject(
3633         struct iscsi_cmd *cmd,
3634         struct iscsi_conn *conn)
3635 {
3636         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3637         struct kvec *iov;
3638         u32 iov_count = 0, tx_size;
3639
3640         iscsit_build_reject(cmd, conn, hdr);
3641
3642         iov = &cmd->iov_misc[0];
3643         iov[iov_count].iov_base = cmd->pdu;
3644         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3645         iov[iov_count].iov_base = cmd->buf_ptr;
3646         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3647
3648         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3649
3650         if (conn->conn_ops->HeaderDigest) {
3651                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3652
3653                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3654                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3655
3656                 iov[0].iov_len += ISCSI_CRC_LEN;
3657                 tx_size += ISCSI_CRC_LEN;
3658                 pr_debug("Attaching CRC32 HeaderDigest for"
3659                         " REJECT PDU 0x%08x\n", *header_digest);
3660         }
3661
3662         if (conn->conn_ops->DataDigest) {
3663                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3664                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3665
3666                 iov[iov_count].iov_base = &cmd->data_crc;
3667                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3668                 tx_size += ISCSI_CRC_LEN;
3669                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3670                                 " PDU 0x%08x\n", cmd->data_crc);
3671         }
3672
3673         cmd->iov_misc_count = iov_count;
3674         cmd->tx_size = tx_size;
3675
3676         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3677                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3678
3679         return 0;
3680 }
3681
3682 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3683 {
3684         struct iscsi_thread_set *ts = conn->thread_set;
3685         int ord, cpu;
3686         /*
3687          * thread_id is assigned from iscsit_global->ts_bitmap from
3688          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3689          *
3690          * Here we use thread_id to determine which CPU that this
3691          * iSCSI connection's iscsi_thread_set will be scheduled to
3692          * execute upon.
3693          */
3694         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3695         for_each_online_cpu(cpu) {
3696                 if (ord-- == 0) {
3697                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3698                         return;
3699                 }
3700         }
3701         /*
3702          * This should never be reached..
3703          */
3704         dump_stack();
3705         cpumask_setall(conn->conn_cpumask);
3706 }
3707
3708 static inline void iscsit_thread_check_cpumask(
3709         struct iscsi_conn *conn,
3710         struct task_struct *p,
3711         int mode)
3712 {
3713         /*
3714          * mode == 1 signals iscsi_target_tx_thread() usage.
3715          * mode == 0 signals iscsi_target_rx_thread() usage.
3716          */
3717         if (mode == 1) {
3718                 if (!conn->conn_tx_reset_cpumask)
3719                         return;
3720                 conn->conn_tx_reset_cpumask = 0;
3721         } else {
3722                 if (!conn->conn_rx_reset_cpumask)
3723                         return;
3724                 conn->conn_rx_reset_cpumask = 0;
3725         }
3726         /*
3727          * Update the CPU mask for this single kthread so that
3728          * both TX and RX kthreads are scheduled to run on the
3729          * same CPU.
3730          */
3731         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3732 }
3733
3734 static int
3735 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3736 {
3737         int ret;
3738
3739         switch (state) {
3740         case ISTATE_SEND_R2T:
3741                 ret = iscsit_send_r2t(cmd, conn);
3742                 if (ret < 0)
3743                         goto err;
3744                 break;
3745         case ISTATE_REMOVE:
3746                 spin_lock_bh(&conn->cmd_lock);
3747                 list_del_init(&cmd->i_conn_node);
3748                 spin_unlock_bh(&conn->cmd_lock);
3749
3750                 iscsit_free_cmd(cmd, false);
3751                 break;
3752         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3753                 iscsit_mod_nopin_response_timer(conn);
3754                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3755                 if (ret < 0)
3756                         goto err;
3757                 break;
3758         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3759                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3760                 if (ret < 0)
3761                         goto err;
3762                 break;
3763         default:
3764                 pr_err("Unknown Opcode: 0x%02x ITT:"
3765                        " 0x%08x, i_state: %d on CID: %hu\n",
3766                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3767                        conn->cid);
3768                 goto err;
3769         }
3770
3771         return 0;
3772
3773 err:
3774         return -1;
3775 }
3776
3777 static int
3778 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3779 {
3780         struct iscsit_transport *t = conn->conn_transport;
3781         struct iscsi_queue_req *qr;
3782         struct iscsi_cmd *cmd;
3783         u8 state;
3784         int ret;
3785
3786         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3787                 atomic_set(&conn->check_immediate_queue, 0);
3788                 cmd = qr->cmd;
3789                 state = qr->state;
3790                 kmem_cache_free(lio_qr_cache, qr);
3791
3792                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3793                 if (ret < 0)
3794                         return ret;
3795         }
3796
3797         return 0;
3798 }
3799
3800 static int
3801 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3802 {
3803         int ret;
3804
3805 check_rsp_state:
3806         switch (state) {
3807         case ISTATE_SEND_DATAIN:
3808                 ret = iscsit_send_datain(cmd, conn);
3809                 if (ret < 0)
3810                         goto err;
3811                 else if (!ret)
3812                         /* more drs */
3813                         goto check_rsp_state;
3814                 else if (ret == 1) {
3815                         /* all done */
3816                         spin_lock_bh(&cmd->istate_lock);
3817                         cmd->i_state = ISTATE_SENT_STATUS;
3818                         spin_unlock_bh(&cmd->istate_lock);
3819
3820                         if (atomic_read(&conn->check_immediate_queue))
3821                                 return 1;
3822
3823                         return 0;
3824                 } else if (ret == 2) {
3825                         /* Still must send status,
3826                            SCF_TRANSPORT_TASK_SENSE was set */
3827                         spin_lock_bh(&cmd->istate_lock);
3828                         cmd->i_state = ISTATE_SEND_STATUS;
3829                         spin_unlock_bh(&cmd->istate_lock);
3830                         state = ISTATE_SEND_STATUS;
3831                         goto check_rsp_state;
3832                 }
3833
3834                 break;
3835         case ISTATE_SEND_STATUS:
3836         case ISTATE_SEND_STATUS_RECOVERY:
3837                 ret = iscsit_send_response(cmd, conn);
3838                 break;
3839         case ISTATE_SEND_LOGOUTRSP:
3840                 ret = iscsit_send_logout(cmd, conn);
3841                 break;
3842         case ISTATE_SEND_ASYNCMSG:
3843                 ret = iscsit_send_conn_drop_async_message(
3844                         cmd, conn);
3845                 break;
3846         case ISTATE_SEND_NOPIN:
3847                 ret = iscsit_send_nopin(cmd, conn);
3848                 break;
3849         case ISTATE_SEND_REJECT:
3850                 ret = iscsit_send_reject(cmd, conn);
3851                 break;
3852         case ISTATE_SEND_TASKMGTRSP:
3853                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3854                 if (ret != 0)
3855                         break;
3856                 ret = iscsit_tmr_post_handler(cmd, conn);
3857                 if (ret != 0)
3858                         iscsit_fall_back_to_erl0(conn->sess);
3859                 break;
3860         case ISTATE_SEND_TEXTRSP:
3861                 ret = iscsit_send_text_rsp(cmd, conn);
3862                 break;
3863         default:
3864                 pr_err("Unknown Opcode: 0x%02x ITT:"
3865                        " 0x%08x, i_state: %d on CID: %hu\n",
3866                        cmd->iscsi_opcode, cmd->init_task_tag,
3867                        state, conn->cid);
3868                 goto err;
3869         }
3870         if (ret < 0)
3871                 goto err;
3872
3873         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3874                 iscsit_tx_thread_wait_for_tcp(conn);
3875                 iscsit_unmap_iovec(cmd);
3876                 goto err;
3877         }
3878         iscsit_unmap_iovec(cmd);
3879
3880         switch (state) {
3881         case ISTATE_SEND_LOGOUTRSP:
3882                 if (!iscsit_logout_post_handler(cmd, conn))
3883                         goto restart;
3884                 /* fall through */
3885         case ISTATE_SEND_STATUS:
3886         case ISTATE_SEND_ASYNCMSG:
3887         case ISTATE_SEND_NOPIN:
3888         case ISTATE_SEND_STATUS_RECOVERY:
3889         case ISTATE_SEND_TEXTRSP:
3890         case ISTATE_SEND_TASKMGTRSP:
3891         case ISTATE_SEND_REJECT:
3892                 spin_lock_bh(&cmd->istate_lock);
3893                 cmd->i_state = ISTATE_SENT_STATUS;
3894                 spin_unlock_bh(&cmd->istate_lock);
3895                 break;
3896         default:
3897                 pr_err("Unknown Opcode: 0x%02x ITT:"
3898                        " 0x%08x, i_state: %d on CID: %hu\n",
3899                        cmd->iscsi_opcode, cmd->init_task_tag,
3900                        cmd->i_state, conn->cid);
3901                 goto err;
3902         }
3903
3904         if (atomic_read(&conn->check_immediate_queue))
3905                 return 1;
3906
3907         return 0;
3908
3909 err:
3910         return -1;
3911 restart:
3912         return -EAGAIN;
3913 }
3914
3915 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3916 {
3917         struct iscsit_transport *t = conn->conn_transport;
3918         struct iscsi_queue_req *qr;
3919         struct iscsi_cmd *cmd;
3920         u8 state;
3921         int ret;
3922
3923         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3924                 cmd = qr->cmd;
3925                 state = qr->state;
3926                 kmem_cache_free(lio_qr_cache, qr);
3927
3928                 ret = t->iscsit_response_queue(conn, cmd, state);
3929                 if (ret == 1 || ret < 0)
3930                         return ret;
3931         }
3932
3933         return 0;
3934 }
3935
3936 int iscsi_target_tx_thread(void *arg)
3937 {
3938         int ret = 0;
3939         struct iscsi_conn *conn;
3940         struct iscsi_thread_set *ts = arg;
3941         /*
3942          * Allow ourselves to be interrupted by SIGINT so that a
3943          * connection recovery / failure event can be triggered externally.
3944          */
3945         allow_signal(SIGINT);
3946
3947 restart:
3948         conn = iscsi_tx_thread_pre_handler(ts);
3949         if (!conn)
3950                 goto out;
3951
3952         ret = 0;
3953
3954         while (!kthread_should_stop()) {
3955                 /*
3956                  * Ensure that both TX and RX per connection kthreads
3957                  * are scheduled to run on the same CPU.
3958                  */
3959                 iscsit_thread_check_cpumask(conn, current, 1);
3960
3961                 wait_event_interruptible(conn->queues_wq,
3962                                          !iscsit_conn_all_queues_empty(conn) ||
3963                                          ts->status == ISCSI_THREAD_SET_RESET);
3964
3965                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3966                      signal_pending(current))
3967                         goto transport_err;
3968
3969 get_immediate:
3970                 ret = iscsit_handle_immediate_queue(conn);
3971                 if (ret < 0)
3972                         goto transport_err;
3973
3974                 ret = iscsit_handle_response_queue(conn);
3975                 if (ret == 1)
3976                         goto get_immediate;
3977                 else if (ret == -EAGAIN)
3978                         goto restart;
3979                 else if (ret < 0)
3980                         goto transport_err;
3981         }
3982
3983 transport_err:
3984         iscsit_take_action_for_connection_exit(conn);
3985         goto restart;
3986 out:
3987         return 0;
3988 }
3989
3990 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3991 {
3992         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3993         struct iscsi_cmd *cmd;
3994         int ret = 0;
3995
3996         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3997         case ISCSI_OP_SCSI_CMD:
3998                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3999                 if (!cmd)
4000                         goto reject;
4001
4002                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4003                 break;
4004         case ISCSI_OP_SCSI_DATA_OUT:
4005                 ret = iscsit_handle_data_out(conn, buf);
4006                 break;
4007         case ISCSI_OP_NOOP_OUT:
4008                 cmd = NULL;
4009                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4010                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4011                         if (!cmd)
4012                                 goto reject;
4013                 }
4014                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4015                 break;
4016         case ISCSI_OP_SCSI_TMFUNC:
4017                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4018                 if (!cmd)
4019                         goto reject;
4020
4021                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4022                 break;
4023         case ISCSI_OP_TEXT:
4024                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4025                 if (!cmd)
4026                         goto reject;
4027
4028                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4029                 break;
4030         case ISCSI_OP_LOGOUT:
4031                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4032                 if (!cmd)
4033                         goto reject;
4034
4035                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4036                 if (ret > 0)
4037                         wait_for_completion_timeout(&conn->conn_logout_comp,
4038                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4039                 break;
4040         case ISCSI_OP_SNACK:
4041                 ret = iscsit_handle_snack(conn, buf);
4042                 break;
4043         default:
4044                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4045                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4046                         pr_err("Cannot recover from unknown"
4047                         " opcode while ERL=0, closing iSCSI connection.\n");
4048                         return -1;
4049                 }
4050                 if (!conn->conn_ops->OFMarker) {
4051                         pr_err("Unable to recover from unknown"
4052                         " opcode while OFMarker=No, closing iSCSI"
4053                                 " connection.\n");
4054                         return -1;
4055                 }
4056                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4057                         pr_err("Unable to recover from unknown"
4058                                 " opcode, closing iSCSI connection.\n");
4059                         return -1;
4060                 }
4061                 break;
4062         }
4063
4064         return ret;
4065 reject:
4066         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4067 }
4068
4069 int iscsi_target_rx_thread(void *arg)
4070 {
4071         int ret;
4072         u8 buffer[ISCSI_HDR_LEN], opcode;
4073         u32 checksum = 0, digest = 0;
4074         struct iscsi_conn *conn = NULL;
4075         struct iscsi_thread_set *ts = arg;
4076         struct kvec iov;
4077         /*
4078          * Allow ourselves to be interrupted by SIGINT so that a
4079          * connection recovery / failure event can be triggered externally.
4080          */
4081         allow_signal(SIGINT);
4082
4083 restart:
4084         conn = iscsi_rx_thread_pre_handler(ts);
4085         if (!conn)
4086                 goto out;
4087
4088         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4089                 struct completion comp;
4090                 int rc;
4091
4092                 init_completion(&comp);
4093                 rc = wait_for_completion_interruptible(&comp);
4094                 if (rc < 0)
4095                         goto transport_err;
4096
4097                 goto out;
4098         }
4099
4100         while (!kthread_should_stop()) {
4101                 /*
4102                  * Ensure that both TX and RX per connection kthreads
4103                  * are scheduled to run on the same CPU.
4104                  */
4105                 iscsit_thread_check_cpumask(conn, current, 0);
4106
4107                 memset(buffer, 0, ISCSI_HDR_LEN);
4108                 memset(&iov, 0, sizeof(struct kvec));
4109
4110                 iov.iov_base    = buffer;
4111                 iov.iov_len     = ISCSI_HDR_LEN;
4112
4113                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4114                 if (ret != ISCSI_HDR_LEN) {
4115                         iscsit_rx_thread_wait_for_tcp(conn);
4116                         goto transport_err;
4117                 }
4118
4119                 if (conn->conn_ops->HeaderDigest) {
4120                         iov.iov_base    = &digest;
4121                         iov.iov_len     = ISCSI_CRC_LEN;
4122
4123                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4124                         if (ret != ISCSI_CRC_LEN) {
4125                                 iscsit_rx_thread_wait_for_tcp(conn);
4126                                 goto transport_err;
4127                         }
4128
4129                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4130                                         buffer, ISCSI_HDR_LEN,
4131                                         0, NULL, (u8 *)&checksum);
4132
4133                         if (digest != checksum) {
4134                                 pr_err("HeaderDigest CRC32C failed,"
4135                                         " received 0x%08x, computed 0x%08x\n",
4136                                         digest, checksum);
4137                                 /*
4138                                  * Set the PDU to 0xff so it will intentionally
4139                                  * hit default in the switch below.
4140                                  */
4141                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4142                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4143                         } else {
4144                                 pr_debug("Got HeaderDigest CRC32C"
4145                                                 " 0x%08x\n", checksum);
4146                         }
4147                 }
4148
4149                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4150                         goto transport_err;
4151
4152                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4153
4154                 if (conn->sess->sess_ops->SessionType &&
4155                    ((!(opcode & ISCSI_OP_TEXT)) ||
4156                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4157                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4158                         " while in Discovery Session, rejecting.\n", opcode);
4159                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4160                                           buffer);
4161                         goto transport_err;
4162                 }
4163
4164                 ret = iscsi_target_rx_opcode(conn, buffer);
4165                 if (ret < 0)
4166                         goto transport_err;
4167         }
4168
4169 transport_err:
4170         if (!signal_pending(current))
4171                 atomic_set(&conn->transport_failed, 1);
4172         iscsit_take_action_for_connection_exit(conn);
4173         goto restart;
4174 out:
4175         return 0;
4176 }
4177
4178 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4179 {
4180         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4181         struct iscsi_session *sess = conn->sess;
4182         /*
4183          * We expect this function to only ever be called from either RX or TX
4184          * thread context via iscsit_close_connection() once the other context
4185          * has been reset -> returned sleeping pre-handler state.
4186          */
4187         spin_lock_bh(&conn->cmd_lock);
4188         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4189
4190                 list_del_init(&cmd->i_conn_node);
4191                 spin_unlock_bh(&conn->cmd_lock);
4192
4193                 iscsit_increment_maxcmdsn(cmd, sess);
4194
4195                 iscsit_free_cmd(cmd, true);
4196
4197                 spin_lock_bh(&conn->cmd_lock);
4198         }
4199         spin_unlock_bh(&conn->cmd_lock);
4200 }
4201
4202 static void iscsit_stop_timers_for_cmds(
4203         struct iscsi_conn *conn)
4204 {
4205         struct iscsi_cmd *cmd;
4206
4207         spin_lock_bh(&conn->cmd_lock);
4208         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4209                 if (cmd->data_direction == DMA_TO_DEVICE)
4210                         iscsit_stop_dataout_timer(cmd);
4211         }
4212         spin_unlock_bh(&conn->cmd_lock);
4213 }
4214
4215 int iscsit_close_connection(
4216         struct iscsi_conn *conn)
4217 {
4218         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4219         struct iscsi_session    *sess = conn->sess;
4220
4221         pr_debug("Closing iSCSI connection CID %hu on SID:"
4222                 " %u\n", conn->cid, sess->sid);
4223         /*
4224          * Always up conn_logout_comp just in case the RX Thread is sleeping
4225          * and the logout response never got sent because the connection
4226          * failed.
4227          */
4228         complete(&conn->conn_logout_comp);
4229
4230         iscsi_release_thread_set(conn);
4231
4232         iscsit_stop_timers_for_cmds(conn);
4233         iscsit_stop_nopin_response_timer(conn);
4234         iscsit_stop_nopin_timer(conn);
4235
4236         if (conn->conn_transport->iscsit_wait_conn)
4237                 conn->conn_transport->iscsit_wait_conn(conn);
4238
4239         /*
4240          * During Connection recovery drop unacknowledged out of order
4241          * commands for this connection, and prepare the other commands
4242          * for realligence.
4243          *
4244          * During normal operation clear the out of order commands (but
4245          * do not free the struct iscsi_ooo_cmdsn's) and release all
4246          * struct iscsi_cmds.
4247          */
4248         if (atomic_read(&conn->connection_recovery)) {
4249                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4250                 iscsit_prepare_cmds_for_realligance(conn);
4251         } else {
4252                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4253                 iscsit_release_commands_from_conn(conn);
4254         }
4255         iscsit_free_queue_reqs_for_conn(conn);
4256
4257         /*
4258          * Handle decrementing session or connection usage count if
4259          * a logout response was not able to be sent because the
4260          * connection failed.  Fall back to Session Recovery here.
4261          */
4262         if (atomic_read(&conn->conn_logout_remove)) {
4263                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4264                         iscsit_dec_conn_usage_count(conn);
4265                         iscsit_dec_session_usage_count(sess);
4266                 }
4267                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4268                         iscsit_dec_conn_usage_count(conn);
4269
4270                 atomic_set(&conn->conn_logout_remove, 0);
4271                 atomic_set(&sess->session_reinstatement, 0);
4272                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4273         }
4274
4275         spin_lock_bh(&sess->conn_lock);
4276         list_del(&conn->conn_list);
4277
4278         /*
4279          * Attempt to let the Initiator know this connection failed by
4280          * sending an Connection Dropped Async Message on another
4281          * active connection.
4282          */
4283         if (atomic_read(&conn->connection_recovery))
4284                 iscsit_build_conn_drop_async_message(conn);
4285
4286         spin_unlock_bh(&sess->conn_lock);
4287
4288         /*
4289          * If connection reinstatement is being performed on this connection,
4290          * up the connection reinstatement semaphore that is being blocked on
4291          * in iscsit_cause_connection_reinstatement().
4292          */
4293         spin_lock_bh(&conn->state_lock);
4294         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4295                 spin_unlock_bh(&conn->state_lock);
4296                 complete(&conn->conn_wait_comp);
4297                 wait_for_completion(&conn->conn_post_wait_comp);
4298                 spin_lock_bh(&conn->state_lock);
4299         }
4300
4301         /*
4302          * If connection reinstatement is being performed on this connection
4303          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4304          * connection wait rcfr semaphore that is being blocked on
4305          * an iscsit_connection_reinstatement_rcfr().
4306          */
4307         if (atomic_read(&conn->connection_wait_rcfr)) {
4308                 spin_unlock_bh(&conn->state_lock);
4309                 complete(&conn->conn_wait_rcfr_comp);
4310                 wait_for_completion(&conn->conn_post_wait_comp);
4311                 spin_lock_bh(&conn->state_lock);
4312         }
4313         atomic_set(&conn->connection_reinstatement, 1);
4314         spin_unlock_bh(&conn->state_lock);
4315
4316         /*
4317          * If any other processes are accessing this connection pointer we
4318          * must wait until they have completed.
4319          */
4320         iscsit_check_conn_usage_count(conn);
4321
4322         if (conn->conn_rx_hash.tfm)
4323                 crypto_free_hash(conn->conn_rx_hash.tfm);
4324         if (conn->conn_tx_hash.tfm)
4325                 crypto_free_hash(conn->conn_tx_hash.tfm);
4326
4327         free_cpumask_var(conn->conn_cpumask);
4328
4329         kfree(conn->conn_ops);
4330         conn->conn_ops = NULL;
4331
4332         if (conn->sock)
4333                 sock_release(conn->sock);
4334
4335         if (conn->conn_transport->iscsit_free_conn)
4336                 conn->conn_transport->iscsit_free_conn(conn);
4337
4338         iscsit_put_transport(conn->conn_transport);
4339
4340         conn->thread_set = NULL;
4341
4342         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4343         conn->conn_state = TARG_CONN_STATE_FREE;
4344         kfree(conn);
4345
4346         spin_lock_bh(&sess->conn_lock);
4347         atomic_dec(&sess->nconn);
4348         pr_debug("Decremented iSCSI connection count to %hu from node:"
4349                 " %s\n", atomic_read(&sess->nconn),
4350                 sess->sess_ops->InitiatorName);
4351         /*
4352          * Make sure that if one connection fails in an non ERL=2 iSCSI
4353          * Session that they all fail.
4354          */
4355         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4356              !atomic_read(&sess->session_logout))
4357                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4358
4359         /*
4360          * If this was not the last connection in the session, and we are
4361          * performing session reinstatement or falling back to ERL=0, call
4362          * iscsit_stop_session() without sleeping to shutdown the other
4363          * active connections.
4364          */
4365         if (atomic_read(&sess->nconn)) {
4366                 if (!atomic_read(&sess->session_reinstatement) &&
4367                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4368                         spin_unlock_bh(&sess->conn_lock);
4369                         return 0;
4370                 }
4371                 if (!atomic_read(&sess->session_stop_active)) {
4372                         atomic_set(&sess->session_stop_active, 1);
4373                         spin_unlock_bh(&sess->conn_lock);
4374                         iscsit_stop_session(sess, 0, 0);
4375                         return 0;
4376                 }
4377                 spin_unlock_bh(&sess->conn_lock);
4378                 return 0;
4379         }
4380
4381         /*
4382          * If this was the last connection in the session and one of the
4383          * following is occurring:
4384          *
4385          * Session Reinstatement is not being performed, and are falling back
4386          * to ERL=0 call iscsit_close_session().
4387          *
4388          * Session Logout was requested.  iscsit_close_session() will be called
4389          * elsewhere.
4390          *
4391          * Session Continuation is not being performed, start the Time2Retain
4392          * handler and check if sleep_on_sess_wait_sem is active.
4393          */
4394         if (!atomic_read(&sess->session_reinstatement) &&
4395              atomic_read(&sess->session_fall_back_to_erl0)) {
4396                 spin_unlock_bh(&sess->conn_lock);
4397                 target_put_session(sess->se_sess);
4398
4399                 return 0;
4400         } else if (atomic_read(&sess->session_logout)) {
4401                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4402                 sess->session_state = TARG_SESS_STATE_FREE;
4403                 spin_unlock_bh(&sess->conn_lock);
4404
4405                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4406                         complete(&sess->session_wait_comp);
4407
4408                 return 0;
4409         } else {
4410                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4411                 sess->session_state = TARG_SESS_STATE_FAILED;
4412
4413                 if (!atomic_read(&sess->session_continuation)) {
4414                         spin_unlock_bh(&sess->conn_lock);
4415                         iscsit_start_time2retain_handler(sess);
4416                 } else
4417                         spin_unlock_bh(&sess->conn_lock);
4418
4419                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4420                         complete(&sess->session_wait_comp);
4421
4422                 return 0;
4423         }
4424         spin_unlock_bh(&sess->conn_lock);
4425
4426         return 0;
4427 }
4428
4429 int iscsit_close_session(struct iscsi_session *sess)
4430 {
4431         struct iscsi_portal_group *tpg = sess->tpg;
4432         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4433
4434         if (atomic_read(&sess->nconn)) {
4435                 pr_err("%d connection(s) still exist for iSCSI session"
4436                         " to %s\n", atomic_read(&sess->nconn),
4437                         sess->sess_ops->InitiatorName);
4438                 BUG();
4439         }
4440
4441         spin_lock_bh(&se_tpg->session_lock);
4442         atomic_set(&sess->session_logout, 1);
4443         atomic_set(&sess->session_reinstatement, 1);
4444         iscsit_stop_time2retain_timer(sess);
4445         spin_unlock_bh(&se_tpg->session_lock);
4446
4447         /*
4448          * transport_deregister_session_configfs() will clear the
4449          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4450          * can be setting it again with __transport_register_session() in
4451          * iscsi_post_login_handler() again after the iscsit_stop_session()
4452          * completes in iscsi_np context.
4453          */
4454         transport_deregister_session_configfs(sess->se_sess);
4455
4456         /*
4457          * If any other processes are accessing this session pointer we must
4458          * wait until they have completed.  If we are in an interrupt (the
4459          * time2retain handler) and contain and active session usage count we
4460          * restart the timer and exit.
4461          */
4462         if (!in_interrupt()) {
4463                 if (iscsit_check_session_usage_count(sess) == 1)
4464                         iscsit_stop_session(sess, 1, 1);
4465         } else {
4466                 if (iscsit_check_session_usage_count(sess) == 2) {
4467                         atomic_set(&sess->session_logout, 0);
4468                         iscsit_start_time2retain_handler(sess);
4469                         return 0;
4470                 }
4471         }
4472
4473         transport_deregister_session(sess->se_sess);
4474
4475         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4476                 iscsit_free_connection_recovery_entires(sess);
4477
4478         iscsit_free_all_ooo_cmdsns(sess);
4479
4480         spin_lock_bh(&se_tpg->session_lock);
4481         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4482         sess->session_state = TARG_SESS_STATE_FREE;
4483         pr_debug("Released iSCSI session from node: %s\n",
4484                         sess->sess_ops->InitiatorName);
4485         tpg->nsessions--;
4486         if (tpg->tpg_tiqn)
4487                 tpg->tpg_tiqn->tiqn_nsessions--;
4488
4489         pr_debug("Decremented number of active iSCSI Sessions on"
4490                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4491
4492         spin_lock(&sess_idr_lock);
4493         idr_remove(&sess_idr, sess->session_index);
4494         spin_unlock(&sess_idr_lock);
4495
4496         kfree(sess->sess_ops);
4497         sess->sess_ops = NULL;
4498         spin_unlock_bh(&se_tpg->session_lock);
4499
4500         kfree(sess);
4501         return 0;
4502 }
4503
4504 static void iscsit_logout_post_handler_closesession(
4505         struct iscsi_conn *conn)
4506 {
4507         struct iscsi_session *sess = conn->sess;
4508
4509         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4510         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4511
4512         atomic_set(&conn->conn_logout_remove, 0);
4513         complete(&conn->conn_logout_comp);
4514
4515         iscsit_dec_conn_usage_count(conn);
4516         iscsit_stop_session(sess, 1, 1);
4517         iscsit_dec_session_usage_count(sess);
4518         target_put_session(sess->se_sess);
4519 }
4520
4521 static void iscsit_logout_post_handler_samecid(
4522         struct iscsi_conn *conn)
4523 {
4524         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4525         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4526
4527         atomic_set(&conn->conn_logout_remove, 0);
4528         complete(&conn->conn_logout_comp);
4529
4530         iscsit_cause_connection_reinstatement(conn, 1);
4531         iscsit_dec_conn_usage_count(conn);
4532 }
4533
4534 static void iscsit_logout_post_handler_diffcid(
4535         struct iscsi_conn *conn,
4536         u16 cid)
4537 {
4538         struct iscsi_conn *l_conn;
4539         struct iscsi_session *sess = conn->sess;
4540         bool conn_found = false;
4541
4542         if (!sess)
4543                 return;
4544
4545         spin_lock_bh(&sess->conn_lock);
4546         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4547                 if (l_conn->cid == cid) {
4548                         iscsit_inc_conn_usage_count(l_conn);
4549                         conn_found = true;
4550                         break;
4551                 }
4552         }
4553         spin_unlock_bh(&sess->conn_lock);
4554
4555         if (!conn_found)
4556                 return;
4557
4558         if (l_conn->sock)
4559                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4560
4561         spin_lock_bh(&l_conn->state_lock);
4562         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4563         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4564         spin_unlock_bh(&l_conn->state_lock);
4565
4566         iscsit_cause_connection_reinstatement(l_conn, 1);
4567         iscsit_dec_conn_usage_count(l_conn);
4568 }
4569
4570 /*
4571  *      Return of 0 causes the TX thread to restart.
4572  */
4573 int iscsit_logout_post_handler(
4574         struct iscsi_cmd *cmd,
4575         struct iscsi_conn *conn)
4576 {
4577         int ret = 0;
4578
4579         switch (cmd->logout_reason) {
4580         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4581                 switch (cmd->logout_response) {
4582                 case ISCSI_LOGOUT_SUCCESS:
4583                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4584                 default:
4585                         iscsit_logout_post_handler_closesession(conn);
4586                         break;
4587                 }
4588                 ret = 0;
4589                 break;
4590         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4591                 if (conn->cid == cmd->logout_cid) {
4592                         switch (cmd->logout_response) {
4593                         case ISCSI_LOGOUT_SUCCESS:
4594                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4595                         default:
4596                                 iscsit_logout_post_handler_samecid(conn);
4597                                 break;
4598                         }
4599                         ret = 0;
4600                 } else {
4601                         switch (cmd->logout_response) {
4602                         case ISCSI_LOGOUT_SUCCESS:
4603                                 iscsit_logout_post_handler_diffcid(conn,
4604                                         cmd->logout_cid);
4605                                 break;
4606                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4607                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4608                         default:
4609                                 break;
4610                         }
4611                         ret = 1;
4612                 }
4613                 break;
4614         case ISCSI_LOGOUT_REASON_RECOVERY:
4615                 switch (cmd->logout_response) {
4616                 case ISCSI_LOGOUT_SUCCESS:
4617                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4618                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4619                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4620                 default:
4621                         break;
4622                 }
4623                 ret = 1;
4624                 break;
4625         default:
4626                 break;
4627
4628         }
4629         return ret;
4630 }
4631 EXPORT_SYMBOL(iscsit_logout_post_handler);
4632
4633 void iscsit_fail_session(struct iscsi_session *sess)
4634 {
4635         struct iscsi_conn *conn;
4636
4637         spin_lock_bh(&sess->conn_lock);
4638         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4639                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4640                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4641         }
4642         spin_unlock_bh(&sess->conn_lock);
4643
4644         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4645         sess->session_state = TARG_SESS_STATE_FAILED;
4646 }
4647
4648 int iscsit_free_session(struct iscsi_session *sess)
4649 {
4650         u16 conn_count = atomic_read(&sess->nconn);
4651         struct iscsi_conn *conn, *conn_tmp = NULL;
4652         int is_last;
4653
4654         spin_lock_bh(&sess->conn_lock);
4655         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4656
4657         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4658                         conn_list) {
4659                 if (conn_count == 0)
4660                         break;
4661
4662                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4663                         is_last = 1;
4664                 } else {
4665                         iscsit_inc_conn_usage_count(conn_tmp);
4666                         is_last = 0;
4667                 }
4668                 iscsit_inc_conn_usage_count(conn);
4669
4670                 spin_unlock_bh(&sess->conn_lock);
4671                 iscsit_cause_connection_reinstatement(conn, 1);
4672                 spin_lock_bh(&sess->conn_lock);
4673
4674                 iscsit_dec_conn_usage_count(conn);
4675                 if (is_last == 0)
4676                         iscsit_dec_conn_usage_count(conn_tmp);
4677
4678                 conn_count--;
4679         }
4680
4681         if (atomic_read(&sess->nconn)) {
4682                 spin_unlock_bh(&sess->conn_lock);
4683                 wait_for_completion(&sess->session_wait_comp);
4684         } else
4685                 spin_unlock_bh(&sess->conn_lock);
4686
4687         target_put_session(sess->se_sess);
4688         return 0;
4689 }
4690
4691 void iscsit_stop_session(
4692         struct iscsi_session *sess,
4693         int session_sleep,
4694         int connection_sleep)
4695 {
4696         u16 conn_count = atomic_read(&sess->nconn);
4697         struct iscsi_conn *conn, *conn_tmp = NULL;
4698         int is_last;
4699
4700         spin_lock_bh(&sess->conn_lock);
4701         if (session_sleep)
4702                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4703
4704         if (connection_sleep) {
4705                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4706                                 conn_list) {
4707                         if (conn_count == 0)
4708                                 break;
4709
4710                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4711                                 is_last = 1;
4712                         } else {
4713                                 iscsit_inc_conn_usage_count(conn_tmp);
4714                                 is_last = 0;
4715                         }
4716                         iscsit_inc_conn_usage_count(conn);
4717
4718                         spin_unlock_bh(&sess->conn_lock);
4719                         iscsit_cause_connection_reinstatement(conn, 1);
4720                         spin_lock_bh(&sess->conn_lock);
4721
4722                         iscsit_dec_conn_usage_count(conn);
4723                         if (is_last == 0)
4724                                 iscsit_dec_conn_usage_count(conn_tmp);
4725                         conn_count--;
4726                 }
4727         } else {
4728                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4729                         iscsit_cause_connection_reinstatement(conn, 0);
4730         }
4731
4732         if (session_sleep && atomic_read(&sess->nconn)) {
4733                 spin_unlock_bh(&sess->conn_lock);
4734                 wait_for_completion(&sess->session_wait_comp);
4735         } else
4736                 spin_unlock_bh(&sess->conn_lock);
4737 }
4738
4739 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4740 {
4741         struct iscsi_session *sess;
4742         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4743         struct se_session *se_sess, *se_sess_tmp;
4744         int session_count = 0;
4745
4746         spin_lock_bh(&se_tpg->session_lock);
4747         if (tpg->nsessions && !force) {
4748                 spin_unlock_bh(&se_tpg->session_lock);
4749                 return -1;
4750         }
4751
4752         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4753                         sess_list) {
4754                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4755
4756                 spin_lock(&sess->conn_lock);
4757                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4758                     atomic_read(&sess->session_logout) ||
4759                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4760                         spin_unlock(&sess->conn_lock);
4761                         continue;
4762                 }
4763                 atomic_set(&sess->session_reinstatement, 1);
4764                 spin_unlock(&sess->conn_lock);
4765                 spin_unlock_bh(&se_tpg->session_lock);
4766
4767                 iscsit_free_session(sess);
4768                 spin_lock_bh(&se_tpg->session_lock);
4769
4770                 session_count++;
4771         }
4772         spin_unlock_bh(&se_tpg->session_lock);
4773
4774         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4775                         " Group: %hu\n", session_count, tpg->tpgt);
4776         return 0;
4777 }
4778
4779 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4780 MODULE_VERSION("4.1.x");
4781 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4782 MODULE_LICENSE("GPL");
4783
4784 module_init(iscsi_target_init_module);
4785 module_exit(iscsi_target_cleanup_module);