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/vmalloc.h>
  25 #include <linux/idr.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_proto.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_fabric.h>
  32
  33 #include <target/iscsi/iscsi_target_core.h>
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_datain_values.h"
  37 #include "iscsi_target_erl0.h"
  38 #include "iscsi_target_erl1.h"
  39 #include "iscsi_target_erl2.h"
  40 #include "iscsi_target_login.h"
  41 #include "iscsi_target_tmr.h"
  42 #include "iscsi_target_tpg.h"
  43 #include "iscsi_target_util.h"
  44 #include "iscsi_target.h"
  45 #include "iscsi_target_device.h"
  46 #include <target/iscsi/iscsi_target_stat.h>
  47
  48 #include <target/iscsi/iscsi_transport.h>
  49
  50 static LIST_HEAD(g_tiqn_list);
  51 static LIST_HEAD(g_np_list);
  52 static DEFINE_SPINLOCK(tiqn_lock);
  53 static DEFINE_MUTEX(np_lock);
  54
  55 static struct idr tiqn_idr;
  56 struct idr sess_idr;
  57 struct mutex auth_id_lock;
  58 spinlock_t sess_idr_lock;
  59
  60 struct iscsit_global *iscsit_global;
  61
  62 struct kmem_cache *lio_qr_cache;
  63 struct kmem_cache *lio_dr_cache;
  64 struct kmem_cache *lio_ooo_cache;
  65 struct kmem_cache *lio_r2t_cache;
  66
  67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  68                         struct iscsi_scsi_req *, u32);
  69
  70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  71 {
  72         struct iscsi_tiqn *tiqn = NULL;
  73
  74         spin_lock(&tiqn_lock);
  75         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  76                 if (!strcmp(tiqn->tiqn, buf)) {
  77
  78                         spin_lock(&tiqn->tiqn_state_lock);
  79                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  80                                 tiqn->tiqn_access_count++;
  81                                 spin_unlock(&tiqn->tiqn_state_lock);
  82                                 spin_unlock(&tiqn_lock);
  83                                 return tiqn;
  84                         }
  85                         spin_unlock(&tiqn->tiqn_state_lock);
  86                 }
  87         }
  88         spin_unlock(&tiqn_lock);
  89
  90         return NULL;
  91 }
  92
  93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  94 {
  95         spin_lock(&tiqn->tiqn_state_lock);
  96         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  97                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  98                 spin_unlock(&tiqn->tiqn_state_lock);
  99                 return 0;
 100         }
 101         spin_unlock(&tiqn->tiqn_state_lock);
 102
 103         return -1;
 104 }
 105
 106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 107 {
 108         spin_lock(&tiqn->tiqn_state_lock);
 109         tiqn->tiqn_access_count--;
 110         spin_unlock(&tiqn->tiqn_state_lock);
 111 }
 112
 113 /*
 114  * Note that IQN formatting is expected to be done in userspace, and
 115  * no explict IQN format checks are done here.
 116  */
 117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 118 {
 119         struct iscsi_tiqn *tiqn = NULL;
 120         int ret;
 121
 122         if (strlen(buf) >= ISCSI_IQN_LEN) {
 123                 pr_err("Target IQN exceeds %d bytes\n",
 124                                 ISCSI_IQN_LEN);
 125                 return ERR_PTR(-EINVAL);
 126         }
 127
 128         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 129         if (!tiqn) {
 130                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 131                 return ERR_PTR(-ENOMEM);
 132         }
 133
 134         sprintf(tiqn->tiqn, "%s", buf);
 135         INIT_LIST_HEAD(&tiqn->tiqn_list);
 136         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 137         spin_lock_init(&tiqn->tiqn_state_lock);
 138         spin_lock_init(&tiqn->tiqn_tpg_lock);
 139         spin_lock_init(&tiqn->sess_err_stats.lock);
 140         spin_lock_init(&tiqn->login_stats.lock);
 141         spin_lock_init(&tiqn->logout_stats.lock);
 142
 143         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 144
 145         idr_preload(GFP_KERNEL);
 146         spin_lock(&tiqn_lock);
 147
 148         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 149         if (ret < 0) {
 150                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 151                 spin_unlock(&tiqn_lock);
 152                 idr_preload_end();
 153                 kfree(tiqn);
 154                 return ERR_PTR(ret);
 155         }
 156         tiqn->tiqn_index = ret;
 157         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 158
 159         spin_unlock(&tiqn_lock);
 160         idr_preload_end();
 161
 162         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 163
 164         return tiqn;
 165
 166 }
 167
 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 169 {
 170         /*
 171          * Wait for accesses to said struct iscsi_tiqn to end.
 172          */
 173         spin_lock(&tiqn->tiqn_state_lock);
 174         while (tiqn->tiqn_access_count != 0) {
 175                 spin_unlock(&tiqn->tiqn_state_lock);
 176                 msleep(10);
 177                 spin_lock(&tiqn->tiqn_state_lock);
 178         }
 179         spin_unlock(&tiqn->tiqn_state_lock);
 180 }
 181
 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 183 {
 184         /*
 185          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 186          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 187          * attempts to access this struct iscsi_tiqn will fail from both transport
 188          * fabric and control code paths.
 189          */
 190         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 191                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 192                 return;
 193         }
 194
 195         iscsit_wait_for_tiqn(tiqn);
 196
 197         spin_lock(&tiqn_lock);
 198         list_del(&tiqn->tiqn_list);
 199         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 200         spin_unlock(&tiqn_lock);
 201
 202         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 203                         tiqn->tiqn);
 204         kfree(tiqn);
 205 }
 206
 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 208 {
 209         int ret;
 210         /*
 211          * Determine if the network portal is accepting storage traffic.
 212          */
 213         spin_lock_bh(&np->np_thread_lock);
 214         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 215                 spin_unlock_bh(&np->np_thread_lock);
 216                 return -1;
 217         }
 218         spin_unlock_bh(&np->np_thread_lock);
 219         /*
 220          * Determine if the portal group is accepting storage traffic.
 221          */
 222         spin_lock_bh(&tpg->tpg_state_lock);
 223         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 224                 spin_unlock_bh(&tpg->tpg_state_lock);
 225                 return -1;
 226         }
 227         spin_unlock_bh(&tpg->tpg_state_lock);
 228
 229         /*
 230          * Here we serialize access across the TIQN+TPG Tuple.
 231          */
 232         ret = down_interruptible(&tpg->np_login_sem);
 233         if (ret != 0)
 234                 return -1;
 235
 236         spin_lock_bh(&tpg->tpg_state_lock);
 237         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 238                 spin_unlock_bh(&tpg->tpg_state_lock);
 239                 up(&tpg->np_login_sem);
 240                 return -1;
 241         }
 242         spin_unlock_bh(&tpg->tpg_state_lock);
 243
 244         return 0;
 245 }
 246
 247 void iscsit_login_kref_put(struct kref *kref)
 248 {
 249         struct iscsi_tpg_np *tpg_np = container_of(kref,
 250                                 struct iscsi_tpg_np, tpg_np_kref);
 251
 252         complete(&tpg_np->tpg_np_comp);
 253 }
 254
 255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 256                        struct iscsi_tpg_np *tpg_np)
 257 {
 258         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 259
 260         up(&tpg->np_login_sem);
 261
 262         if (tpg_np)
 263                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 264
 265         if (tiqn)
 266                 iscsit_put_tiqn_for_login(tiqn);
 267
 268         return 0;
 269 }
 270
 271 bool iscsit_check_np_match(
 272         struct __kernel_sockaddr_storage *sockaddr,
 273         struct iscsi_np *np,
 274         int network_transport)
 275 {
 276         struct sockaddr_in *sock_in, *sock_in_e;
 277         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 278         bool ip_match = false;
 279         u16 port;
 280
 281         if (sockaddr->ss_family == AF_INET6) {
 282                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 283                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 284
 285                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 286                             &sock_in6_e->sin6_addr.in6_u,
 287                             sizeof(struct in6_addr)))
 288                         ip_match = true;
 289
 290                 port = ntohs(sock_in6->sin6_port);
 291         } else {
 292                 sock_in = (struct sockaddr_in *)sockaddr;
 293                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 294
 295                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 296                         ip_match = true;
 297
 298                 port = ntohs(sock_in->sin_port);
 299         }
 300
 301         if (ip_match && (np->np_port == port) &&
 302             (np->np_network_transport == network_transport))
 303                 return true;
 304
 305         return false;
 306 }
 307
 308 /*
 309  * Called with mutex np_lock held
 310  */
 311 static struct iscsi_np *iscsit_get_np(
 312         struct __kernel_sockaddr_storage *sockaddr,
 313         int network_transport)
 314 {
 315         struct iscsi_np *np;
 316         bool match;
 317
 318         list_for_each_entry(np, &g_np_list, np_list) {
 319                 spin_lock_bh(&np->np_thread_lock);
 320                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 321                         spin_unlock_bh(&np->np_thread_lock);
 322                         continue;
 323                 }
 324
 325                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 326                 if (match) {
 327                         /*
 328                          * Increment the np_exports reference count now to
 329                          * prevent iscsit_del_np() below from being called
 330                          * while iscsi_tpg_add_network_portal() is called.
 331                          */
 332                         np->np_exports++;
 333                         spin_unlock_bh(&np->np_thread_lock);
 334                         return np;
 335                 }
 336                 spin_unlock_bh(&np->np_thread_lock);
 337         }
 338
 339         return NULL;
 340 }
 341
 342 struct iscsi_np *iscsit_add_np(
 343         struct __kernel_sockaddr_storage *sockaddr,
 344         char *ip_str,
 345         int network_transport)
 346 {
 347         struct sockaddr_in *sock_in;
 348         struct sockaddr_in6 *sock_in6;
 349         struct iscsi_np *np;
 350         int ret;
 351
 352         mutex_lock(&np_lock);
 353
 354         /*
 355          * Locate the existing struct iscsi_np if already active..
 356          */
 357         np = iscsit_get_np(sockaddr, network_transport);
 358         if (np) {
 359                 mutex_unlock(&np_lock);
 360                 return np;
 361         }
 362
 363         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 364         if (!np) {
 365                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 366                 mutex_unlock(&np_lock);
 367                 return ERR_PTR(-ENOMEM);
 368         }
 369
 370         np->np_flags |= NPF_IP_NETWORK;
 371         if (sockaddr->ss_family == AF_INET6) {
 372                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 373                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 374                 np->np_port = ntohs(sock_in6->sin6_port);
 375         } else {
 376                 sock_in = (struct sockaddr_in *)sockaddr;
 377                 sprintf(np->np_ip, "%s", ip_str);
 378                 np->np_port = ntohs(sock_in->sin_port);
 379         }
 380
 381         np->np_network_transport = network_transport;
 382         spin_lock_init(&np->np_thread_lock);
 383         init_completion(&np->np_restart_comp);
 384         INIT_LIST_HEAD(&np->np_list);
 385
 386         ret = iscsi_target_setup_login_socket(np, sockaddr);
 387         if (ret != 0) {
 388                 kfree(np);
 389                 mutex_unlock(&np_lock);
 390                 return ERR_PTR(ret);
 391         }
 392
 393         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 394         if (IS_ERR(np->np_thread)) {
 395                 pr_err("Unable to create kthread: iscsi_np\n");
 396                 ret = PTR_ERR(np->np_thread);
 397                 kfree(np);
 398                 mutex_unlock(&np_lock);
 399                 return ERR_PTR(ret);
 400         }
 401         /*
 402          * Increment the np_exports reference count now to prevent
 403          * iscsit_del_np() below from being run while a new call to
 404          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 405          * active.  We don't need to hold np->np_thread_lock at this
 406          * point because iscsi_np has not been added to g_np_list yet.
 407          */
 408         np->np_exports = 1;
 409         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 410
 411         list_add_tail(&np->np_list, &g_np_list);
 412         mutex_unlock(&np_lock);
 413
 414         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 415                 np->np_ip, np->np_port, np->np_transport->name);
 416
 417         return np;
 418 }
 419
 420 int iscsit_reset_np_thread(
 421         struct iscsi_np *np,
 422         struct iscsi_tpg_np *tpg_np,
 423         struct iscsi_portal_group *tpg,
 424         bool shutdown)
 425 {
 426         spin_lock_bh(&np->np_thread_lock);
 427         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 return 0;
 430         }
 431         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 432
 433         if (np->np_thread) {
 434                 spin_unlock_bh(&np->np_thread_lock);
 435                 send_sig(SIGINT, np->np_thread, 1);
 436                 wait_for_completion(&np->np_restart_comp);
 437                 spin_lock_bh(&np->np_thread_lock);
 438         }
 439         spin_unlock_bh(&np->np_thread_lock);
 440
 441         if (tpg_np && shutdown) {
 442                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 443
 444                 wait_for_completion(&tpg_np->tpg_np_comp);
 445         }
 446
 447         return 0;
 448 }
 449
 450 static void iscsit_free_np(struct iscsi_np *np)
 451 {
 452         if (np->np_socket)
 453                 sock_release(np->np_socket);
 454 }
 455
 456 int iscsit_del_np(struct iscsi_np *np)
 457 {
 458         spin_lock_bh(&np->np_thread_lock);
 459         np->np_exports--;
 460         if (np->np_exports) {
 461                 np->enabled = true;
 462                 spin_unlock_bh(&np->np_thread_lock);
 463                 return 0;
 464         }
 465         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 466         spin_unlock_bh(&np->np_thread_lock);
 467
 468         if (np->np_thread) {
 469                 /*
 470                  * We need to send the signal to wakeup Linux/Net
 471                  * which may be sleeping in sock_accept()..
 472                  */
 473                 send_sig(SIGINT, np->np_thread, 1);
 474                 kthread_stop(np->np_thread);
 475                 np->np_thread = NULL;
 476         }
 477
 478         np->np_transport->iscsit_free_np(np);
 479
 480         mutex_lock(&np_lock);
 481         list_del(&np->np_list);
 482         mutex_unlock(&np_lock);
 483
 484         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 485                 np->np_ip, np->np_port, np->np_transport->name);
 486
 487         iscsit_put_transport(np->np_transport);
 488         kfree(np);
 489         return 0;
 490 }
 491
 492 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 493 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 494
 495 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 496 {
 497         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 498         return 0;
 499 }
 500
 501 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 502 {
 503         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 504
 505         spin_lock_bh(&conn->cmd_lock);
 506         if (!list_empty(&cmd->i_conn_node))
 507                 list_del_init(&cmd->i_conn_node);
 508         spin_unlock_bh(&conn->cmd_lock);
 509
 510         __iscsit_free_cmd(cmd, scsi_cmd, true);
 511 }
 512
 513 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 514 {
 515         return TARGET_PROT_NORMAL;
 516 }
 517
 518 static struct iscsit_transport iscsi_target_transport = {
 519         .name                   = "iSCSI/TCP",
 520         .transport_type         = ISCSI_TCP,
 521         .owner                  = NULL,
 522         .iscsit_setup_np        = iscsit_setup_np,
 523         .iscsit_accept_np       = iscsit_accept_np,
 524         .iscsit_free_np         = iscsit_free_np,
 525         .iscsit_get_login_rx    = iscsit_get_login_rx,
 526         .iscsit_put_login_tx    = iscsit_put_login_tx,
 527         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 528         .iscsit_immediate_queue = iscsit_immediate_queue,
 529         .iscsit_response_queue  = iscsit_response_queue,
 530         .iscsit_queue_data_in   = iscsit_queue_rsp,
 531         .iscsit_queue_status    = iscsit_queue_rsp,
 532         .iscsit_aborted_task    = iscsit_aborted_task,
 533         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 534 };
 535
 536 static int __init iscsi_target_init_module(void)
 537 {
 538         int ret = 0, size;
 539
 540         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 541
 542         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 543         if (!iscsit_global) {
 544                 pr_err("Unable to allocate memory for iscsit_global\n");
 545                 return -1;
 546         }
 547         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 548         mutex_init(&auth_id_lock);
 549         spin_lock_init(&sess_idr_lock);
 550         idr_init(&tiqn_idr);
 551         idr_init(&sess_idr);
 552
 553         ret = target_register_template(&iscsi_ops);
 554         if (ret)
 555                 goto out;
 556
 557         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 558         iscsit_global->ts_bitmap = vzalloc(size);
 559         if (!iscsit_global->ts_bitmap) {
 560                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 561                 goto configfs_out;
 562         }
 563
 564         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 565                         sizeof(struct iscsi_queue_req),
 566                         __alignof__(struct iscsi_queue_req), 0, NULL);
 567         if (!lio_qr_cache) {
 568                 pr_err("nable to kmem_cache_create() for"
 569                                 " lio_qr_cache\n");
 570                 goto bitmap_out;
 571         }
 572
 573         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 574                         sizeof(struct iscsi_datain_req),
 575                         __alignof__(struct iscsi_datain_req), 0, NULL);
 576         if (!lio_dr_cache) {
 577                 pr_err("Unable to kmem_cache_create() for"
 578                                 " lio_dr_cache\n");
 579                 goto qr_out;
 580         }
 581
 582         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 583                         sizeof(struct iscsi_ooo_cmdsn),
 584                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 585         if (!lio_ooo_cache) {
 586                 pr_err("Unable to kmem_cache_create() for"
 587                                 " lio_ooo_cache\n");
 588                 goto dr_out;
 589         }
 590
 591         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 592                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 593                         0, NULL);
 594         if (!lio_r2t_cache) {
 595                 pr_err("Unable to kmem_cache_create() for"
 596                                 " lio_r2t_cache\n");
 597                 goto ooo_out;
 598         }
 599
 600         iscsit_register_transport(&iscsi_target_transport);
 601
 602         if (iscsit_load_discovery_tpg() < 0)
 603                 goto r2t_out;
 604
 605         return ret;
 606 r2t_out:
 607         iscsit_unregister_transport(&iscsi_target_transport);
 608         kmem_cache_destroy(lio_r2t_cache);
 609 ooo_out:
 610         kmem_cache_destroy(lio_ooo_cache);
 611 dr_out:
 612         kmem_cache_destroy(lio_dr_cache);
 613 qr_out:
 614         kmem_cache_destroy(lio_qr_cache);
 615 bitmap_out:
 616         vfree(iscsit_global->ts_bitmap);
 617 configfs_out:
 618         /* XXX: this probably wants it to be it's own unwind step.. */
 619         if (iscsit_global->discovery_tpg)
 620                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 621         target_unregister_template(&iscsi_ops);
 622 out:
 623         kfree(iscsit_global);
 624         return -ENOMEM;
 625 }
 626
 627 static void __exit iscsi_target_cleanup_module(void)
 628 {
 629         iscsit_release_discovery_tpg();
 630         iscsit_unregister_transport(&iscsi_target_transport);
 631         kmem_cache_destroy(lio_qr_cache);
 632         kmem_cache_destroy(lio_dr_cache);
 633         kmem_cache_destroy(lio_ooo_cache);
 634         kmem_cache_destroy(lio_r2t_cache);
 635
 636         /*
 637          * Shutdown discovery sessions and disable discovery TPG
 638          */
 639         if (iscsit_global->discovery_tpg)
 640                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 641
 642         target_unregister_template(&iscsi_ops);
 643
 644         vfree(iscsit_global->ts_bitmap);
 645         kfree(iscsit_global);
 646 }
 647
 648 static int iscsit_add_reject(
 649         struct iscsi_conn *conn,
 650         u8 reason,
 651         unsigned char *buf)
 652 {
 653         struct iscsi_cmd *cmd;
 654
 655         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 656         if (!cmd)
 657                 return -1;
 658
 659         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 660         cmd->reject_reason = reason;
 661
 662         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 663         if (!cmd->buf_ptr) {
 664                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 665                 iscsit_free_cmd(cmd, false);
 666                 return -1;
 667         }
 668
 669         spin_lock_bh(&conn->cmd_lock);
 670         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 671         spin_unlock_bh(&conn->cmd_lock);
 672
 673         cmd->i_state = ISTATE_SEND_REJECT;
 674         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 675
 676         return -1;
 677 }
 678
 679 static int iscsit_add_reject_from_cmd(
 680         struct iscsi_cmd *cmd,
 681         u8 reason,
 682         bool add_to_conn,
 683         unsigned char *buf)
 684 {
 685         struct iscsi_conn *conn;
 686
 687         if (!cmd->conn) {
 688                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 689                                 cmd->init_task_tag);
 690                 return -1;
 691         }
 692         conn = cmd->conn;
 693
 694         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 695         cmd->reject_reason = reason;
 696
 697         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 698         if (!cmd->buf_ptr) {
 699                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 700                 iscsit_free_cmd(cmd, false);
 701                 return -1;
 702         }
 703
 704         if (add_to_conn) {
 705                 spin_lock_bh(&conn->cmd_lock);
 706                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 707                 spin_unlock_bh(&conn->cmd_lock);
 708         }
 709
 710         cmd->i_state = ISTATE_SEND_REJECT;
 711         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 712         /*
 713          * Perform the kref_put now if se_cmd has already been setup by
 714          * scsit_setup_scsi_cmd()
 715          */
 716         if (cmd->se_cmd.se_tfo != NULL) {
 717                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 718                 target_put_sess_cmd(&cmd->se_cmd);
 719         }
 720         return -1;
 721 }
 722
 723 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 724                                  unsigned char *buf)
 725 {
 726         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 727 }
 728
 729 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 730 {
 731         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 732 }
 733
 734 /*
 735  * Map some portion of the allocated scatterlist to an iovec, suitable for
 736  * kernel sockets to copy data in/out.
 737  */
 738 static int iscsit_map_iovec(
 739         struct iscsi_cmd *cmd,
 740         struct kvec *iov,
 741         u32 data_offset,
 742         u32 data_length)
 743 {
 744         u32 i = 0;
 745         struct scatterlist *sg;
 746         unsigned int page_off;
 747
 748         /*
 749          * We know each entry in t_data_sg contains a page.
 750          */
 751         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 752         page_off = (data_offset % PAGE_SIZE);
 753
 754         cmd->first_data_sg = sg;
 755         cmd->first_data_sg_off = page_off;
 756
 757         while (data_length) {
 758                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 759
 760                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 761                 iov[i].iov_len = cur_len;
 762
 763                 data_length -= cur_len;
 764                 page_off = 0;
 765                 sg = sg_next(sg);
 766                 i++;
 767         }
 768
 769         cmd->kmapped_nents = i;
 770
 771         return i;
 772 }
 773
 774 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 775 {
 776         u32 i;
 777         struct scatterlist *sg;
 778
 779         sg = cmd->first_data_sg;
 780
 781         for (i = 0; i < cmd->kmapped_nents; i++)
 782                 kunmap(sg_page(&sg[i]));
 783 }
 784
 785 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 786 {
 787         LIST_HEAD(ack_list);
 788         struct iscsi_cmd *cmd, *cmd_p;
 789
 790         conn->exp_statsn = exp_statsn;
 791
 792         if (conn->sess->sess_ops->RDMAExtensions)
 793                 return;
 794
 795         spin_lock_bh(&conn->cmd_lock);
 796         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 797                 spin_lock(&cmd->istate_lock);
 798                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 799                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 800                         cmd->i_state = ISTATE_REMOVE;
 801                         spin_unlock(&cmd->istate_lock);
 802                         list_move_tail(&cmd->i_conn_node, &ack_list);
 803                         continue;
 804                 }
 805                 spin_unlock(&cmd->istate_lock);
 806         }
 807         spin_unlock_bh(&conn->cmd_lock);
 808
 809         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 810                 list_del_init(&cmd->i_conn_node);
 811                 iscsit_free_cmd(cmd, false);
 812         }
 813 }
 814
 815 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 816 {
 817         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 818
 819         iov_count += ISCSI_IOV_DATA_BUFFER;
 820
 821         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 822         if (!cmd->iov_data) {
 823                 pr_err("Unable to allocate cmd->iov_data\n");
 824                 return -ENOMEM;
 825         }
 826
 827         cmd->orig_iov_data_count = iov_count;
 828         return 0;
 829 }
 830
 831 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 832                           unsigned char *buf)
 833 {
 834         int data_direction, payload_length;
 835         struct iscsi_scsi_req *hdr;
 836         int iscsi_task_attr;
 837         int sam_task_attr;
 838
 839         atomic_long_inc(&conn->sess->cmd_pdus);
 840
 841         hdr                     = (struct iscsi_scsi_req *) buf;
 842         payload_length          = ntoh24(hdr->dlength);
 843
 844         /* FIXME; Add checks for AdditionalHeaderSegment */
 845
 846         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 847             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 848                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 849                                 " not set. Bad iSCSI Initiator.\n");
 850                 return iscsit_add_reject_cmd(cmd,
 851                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 852         }
 853
 854         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 855              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 856                 /*
 857                  * From RFC-3720 Section 10.3.1:
 858                  *
 859                  * "Either or both of R and W MAY be 1 when either the
 860                  *  Expected Data Transfer Length and/or Bidirectional Read
 861                  *  Expected Data Transfer Length are 0"
 862                  *
 863                  * For this case, go ahead and clear the unnecssary bits
 864                  * to avoid any confusion with ->data_direction.
 865                  */
 866                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 867                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 868
 869                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 870                         " set when Expected Data Transfer Length is 0 for"
 871                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 872         }
 873
 874         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 875             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 876                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 877                         " MUST be set if Expected Data Transfer Length is not 0."
 878                         " Bad iSCSI Initiator\n");
 879                 return iscsit_add_reject_cmd(cmd,
 880                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 881         }
 882
 883         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 884             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 885                 pr_err("Bidirectional operations not supported!\n");
 886                 return iscsit_add_reject_cmd(cmd,
 887                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 888         }
 889
 890         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 891                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 892                                 " Scsi Command PDU.\n");
 893                 return iscsit_add_reject_cmd(cmd,
 894                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 895         }
 896
 897         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 898                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 899                         " protocol error.\n", payload_length);
 900                 return iscsit_add_reject_cmd(cmd,
 901                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 902         }
 903
 904         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 905             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 906                 pr_err("Expected Data Transfer Length and Length of"
 907                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 908                         " bit is not set protocol error\n");
 909                 return iscsit_add_reject_cmd(cmd,
 910                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 911         }
 912
 913         if (payload_length > be32_to_cpu(hdr->data_length)) {
 914                 pr_err("DataSegmentLength: %u is greater than"
 915                         " EDTL: %u, protocol error.\n", payload_length,
 916                                 hdr->data_length);
 917                 return iscsit_add_reject_cmd(cmd,
 918                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 919         }
 920
 921         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 922                 pr_err("DataSegmentLength: %u is greater than"
 923                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 924                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 925                 return iscsit_add_reject_cmd(cmd,
 926                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 927         }
 928
 929         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 930                 pr_err("DataSegmentLength: %u is greater than"
 931                         " FirstBurstLength: %u, protocol error.\n",
 932                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 933                 return iscsit_add_reject_cmd(cmd,
 934                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 935         }
 936
 937         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 938                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 939                           DMA_NONE;
 940
 941         cmd->data_direction = data_direction;
 942         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 943         /*
 944          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 945          */
 946         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 947             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 948                 sam_task_attr = TCM_SIMPLE_TAG;
 949         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 950                 sam_task_attr = TCM_ORDERED_TAG;
 951         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 952                 sam_task_attr = TCM_HEAD_TAG;
 953         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 954                 sam_task_attr = TCM_ACA_TAG;
 955         else {
 956                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 957                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
 958                 sam_task_attr = TCM_SIMPLE_TAG;
 959         }
 960
 961         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 962         cmd->i_state            = ISTATE_NEW_CMD;
 963         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 964         cmd->immediate_data     = (payload_length) ? 1 : 0;
 965         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 966                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 967         if (cmd->unsolicited_data)
 968                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 969
 970         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 971         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 972                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
 973         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 974                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 975         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 976         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 977         cmd->first_burst_len    = payload_length;
 978
 979         if (!conn->sess->sess_ops->RDMAExtensions &&
 980              cmd->data_direction == DMA_FROM_DEVICE) {
 981                 struct iscsi_datain_req *dr;
 982
 983                 dr = iscsit_allocate_datain_req();
 984                 if (!dr)
 985                         return iscsit_add_reject_cmd(cmd,
 986                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 987
 988                 iscsit_attach_datain_req(cmd, dr);
 989         }
 990
 991         /*
 992          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 993          */
 994         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
 995                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 996                         cmd->data_direction, sam_task_attr,
 997                         cmd->sense_buffer + 2);
 998
 999         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1000                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1001                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1002                 conn->cid);
1003
1004         target_get_sess_cmd(&cmd->se_cmd, true);
1005
1006         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1007                                                      scsilun_to_int(&hdr->lun));
1008         if (cmd->sense_reason)
1009                 goto attach_cmd;
1010
1011         /* only used for printks or comparing with ->ref_task_tag */
1012         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1013         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1014         if (cmd->sense_reason) {
1015                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1016                         return iscsit_add_reject_cmd(cmd,
1017                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1018                 }
1019
1020                 goto attach_cmd;
1021         }
1022
1023         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1024                 return iscsit_add_reject_cmd(cmd,
1025                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1026         }
1027
1028 attach_cmd:
1029         spin_lock_bh(&conn->cmd_lock);
1030         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1031         spin_unlock_bh(&conn->cmd_lock);
1032         /*
1033          * Check if we need to delay processing because of ALUA
1034          * Active/NonOptimized primary access state..
1035          */
1036         core_alua_check_nonop_delay(&cmd->se_cmd);
1037
1038         return 0;
1039 }
1040 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1041
1042 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1043 {
1044         iscsit_set_dataout_sequence_values(cmd);
1045
1046         spin_lock_bh(&cmd->dataout_timeout_lock);
1047         iscsit_start_dataout_timer(cmd, cmd->conn);
1048         spin_unlock_bh(&cmd->dataout_timeout_lock);
1049 }
1050 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1051
1052 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1053                             struct iscsi_scsi_req *hdr)
1054 {
1055         int cmdsn_ret = 0;
1056         /*
1057          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1058          * the Immediate Bit is not set, and no Immediate
1059          * Data is attached.
1060          *
1061          * A PDU/CmdSN carrying Immediate Data can only
1062          * be processed after the DataCRC has passed.
1063          * If the DataCRC fails, the CmdSN MUST NOT
1064          * be acknowledged. (See below)
1065          */
1066         if (!cmd->immediate_data) {
1067                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1068                                         (unsigned char *)hdr, hdr->cmdsn);
1069                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1070                         return -1;
1071                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1072                         target_put_sess_cmd(&cmd->se_cmd);
1073                         return 0;
1074                 }
1075         }
1076
1077         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1078
1079         /*
1080          * If no Immediate Data is attached, it's OK to return now.
1081          */
1082         if (!cmd->immediate_data) {
1083                 if (!cmd->sense_reason && cmd->unsolicited_data)
1084                         iscsit_set_unsoliticed_dataout(cmd);
1085                 if (!cmd->sense_reason)
1086                         return 0;
1087
1088                 target_put_sess_cmd(&cmd->se_cmd);
1089                 return 0;
1090         }
1091
1092         /*
1093          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1094          * execution.  These exceptions are processed in CmdSN order using
1095          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1096          */
1097         if (cmd->sense_reason) {
1098                 if (cmd->reject_reason)
1099                         return 0;
1100
1101                 return 1;
1102         }
1103         /*
1104          * Call directly into transport_generic_new_cmd() to perform
1105          * the backend memory allocation.
1106          */
1107         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1108         if (cmd->sense_reason)
1109                 return 1;
1110
1111         return 0;
1112 }
1113 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1114
1115 static int
1116 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1117                           bool dump_payload)
1118 {
1119         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1120         /*
1121          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1122          */
1123         if (dump_payload)
1124                 goto after_immediate_data;
1125
1126         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1127                                         cmd->first_burst_len);
1128 after_immediate_data:
1129         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1130                 /*
1131                  * A PDU/CmdSN carrying Immediate Data passed
1132                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1133                  * Immediate Bit is not set.
1134                  */
1135                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1136                                         (unsigned char *)hdr, hdr->cmdsn);
1137                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1138                         return -1;
1139
1140                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1141                         int rc;
1142
1143                         rc = iscsit_dump_data_payload(cmd->conn,
1144                                                       cmd->first_burst_len, 1);
1145                         target_put_sess_cmd(&cmd->se_cmd);
1146                         return rc;
1147                 } else if (cmd->unsolicited_data)
1148                         iscsit_set_unsoliticed_dataout(cmd);
1149
1150         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1151                 /*
1152                  * Immediate Data failed DataCRC and ERL>=1,
1153                  * silently drop this PDU and let the initiator
1154                  * plug the CmdSN gap.
1155                  *
1156                  * FIXME: Send Unsolicited NOPIN with reserved
1157                  * TTT here to help the initiator figure out
1158                  * the missing CmdSN, although they should be
1159                  * intelligent enough to determine the missing
1160                  * CmdSN and issue a retry to plug the sequence.
1161                  */
1162                 cmd->i_state = ISTATE_REMOVE;
1163                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1164         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1165                 return -1;
1166
1167         return 0;
1168 }
1169
1170 static int
1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1172                            unsigned char *buf)
1173 {
1174         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1175         int rc, immed_data;
1176         bool dump_payload = false;
1177
1178         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1179         if (rc < 0)
1180                 return 0;
1181         /*
1182          * Allocation iovecs needed for struct socket operations for
1183          * traditional iSCSI block I/O.
1184          */
1185         if (iscsit_allocate_iovecs(cmd) < 0) {
1186                 return iscsit_reject_cmd(cmd,
1187                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1188         }
1189         immed_data = cmd->immediate_data;
1190
1191         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1192         if (rc < 0)
1193                 return rc;
1194         else if (rc > 0)
1195                 dump_payload = true;
1196
1197         if (!immed_data)
1198                 return 0;
1199
1200         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1201 }
1202
1203 static u32 iscsit_do_crypto_hash_sg(
1204         struct hash_desc *hash,
1205         struct iscsi_cmd *cmd,
1206         u32 data_offset,
1207         u32 data_length,
1208         u32 padding,
1209         u8 *pad_bytes)
1210 {
1211         u32 data_crc;
1212         u32 i;
1213         struct scatterlist *sg;
1214         unsigned int page_off;
1215
1216         crypto_hash_init(hash);
1217
1218         sg = cmd->first_data_sg;
1219         page_off = cmd->first_data_sg_off;
1220
1221         i = 0;
1222         while (data_length) {
1223                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1224
1225                 crypto_hash_update(hash, &sg[i], cur_len);
1226
1227                 data_length -= cur_len;
1228                 page_off = 0;
1229                 i++;
1230         }
1231
1232         if (padding) {
1233                 struct scatterlist pad_sg;
1234
1235                 sg_init_one(&pad_sg, pad_bytes, padding);
1236                 crypto_hash_update(hash, &pad_sg, padding);
1237         }
1238         crypto_hash_final(hash, (u8 *) &data_crc);
1239
1240         return data_crc;
1241 }
1242
1243 static void iscsit_do_crypto_hash_buf(
1244         struct hash_desc *hash,
1245         const void *buf,
1246         u32 payload_length,
1247         u32 padding,
1248         u8 *pad_bytes,
1249         u8 *data_crc)
1250 {
1251         struct scatterlist sg;
1252
1253         crypto_hash_init(hash);
1254
1255         sg_init_one(&sg, buf, payload_length);
1256         crypto_hash_update(hash, &sg, payload_length);
1257
1258         if (padding) {
1259                 sg_init_one(&sg, pad_bytes, padding);
1260                 crypto_hash_update(hash, &sg, padding);
1261         }
1262         crypto_hash_final(hash, data_crc);
1263 }
1264
1265 int
1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1267                           struct iscsi_cmd **out_cmd)
1268 {
1269         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1270         struct iscsi_cmd *cmd = NULL;
1271         struct se_cmd *se_cmd;
1272         u32 payload_length = ntoh24(hdr->dlength);
1273         int rc;
1274
1275         if (!payload_length) {
1276                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1277                 return 0;
1278         }
1279
1280         /* iSCSI write */
1281         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1282
1283         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1284                 pr_err("DataSegmentLength: %u is greater than"
1285                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1286                         conn->conn_ops->MaxXmitDataSegmentLength);
1287                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1288                                          buf);
1289         }
1290
1291         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1292                         payload_length);
1293         if (!cmd)
1294                 return 0;
1295
1296         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1297                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1298                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1299                 payload_length, conn->cid);
1300
1301         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1302                 pr_err("Command ITT: 0x%08x received DataOUT after"
1303                         " last DataOUT received, dumping payload\n",
1304                         cmd->init_task_tag);
1305                 return iscsit_dump_data_payload(conn, payload_length, 1);
1306         }
1307
1308         if (cmd->data_direction != DMA_TO_DEVICE) {
1309                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1310                         " NON-WRITE command.\n", cmd->init_task_tag);
1311                 return iscsit_dump_data_payload(conn, payload_length, 1);
1312         }
1313         se_cmd = &cmd->se_cmd;
1314         iscsit_mod_dataout_timer(cmd);
1315
1316         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1317                 pr_err("DataOut Offset: %u, Length %u greater than"
1318                         " iSCSI Command EDTL %u, protocol error.\n",
1319                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1320                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1321         }
1322
1323         if (cmd->unsolicited_data) {
1324                 int dump_unsolicited_data = 0;
1325
1326                 if (conn->sess->sess_ops->InitialR2T) {
1327                         pr_err("Received unexpected unsolicited data"
1328                                 " while InitialR2T=Yes, protocol error.\n");
1329                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1330                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1331                         return -1;
1332                 }
1333                 /*
1334                  * Special case for dealing with Unsolicited DataOUT
1335                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1336                  * failures;
1337                  */
1338
1339                 /* Something's amiss if we're not in WRITE_PENDING state... */
1340                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1341                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1342                         dump_unsolicited_data = 1;
1343
1344                 if (dump_unsolicited_data) {
1345                         /*
1346                          * Check if a delayed TASK_ABORTED status needs to
1347                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1348                          * received with the unsolicitied data out.
1349                          */
1350                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1351                                 iscsit_stop_dataout_timer(cmd);
1352
1353                         transport_check_aborted_status(se_cmd,
1354                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1355                         return iscsit_dump_data_payload(conn, payload_length, 1);
1356                 }
1357         } else {
1358                 /*
1359                  * For the normal solicited data path:
1360                  *
1361                  * Check for a delayed TASK_ABORTED status and dump any
1362                  * incoming data out payload if one exists.  Also, when the
1363                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1364                  * data out sequence, we decrement outstanding_r2ts.  Once
1365                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1366                  * TASK_ABORTED status.
1367                  */
1368                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1369                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1370                                 if (--cmd->outstanding_r2ts < 1) {
1371                                         iscsit_stop_dataout_timer(cmd);
1372                                         transport_check_aborted_status(
1373                                                         se_cmd, 1);
1374                                 }
1375
1376                         return iscsit_dump_data_payload(conn, payload_length, 1);
1377                 }
1378         }
1379         /*
1380          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1381          * within-command recovery checks before receiving the payload.
1382          */
1383         rc = iscsit_check_pre_dataout(cmd, buf);
1384         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1385                 return 0;
1386         else if (rc == DATAOUT_CANNOT_RECOVER)
1387                 return -1;
1388
1389         *out_cmd = cmd;
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1393
1394 static int
1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1396                    struct iscsi_data *hdr)
1397 {
1398         struct kvec *iov;
1399         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1400         u32 payload_length = ntoh24(hdr->dlength);
1401         int iov_ret, data_crc_failed = 0;
1402
1403         rx_size += payload_length;
1404         iov = &cmd->iov_data[0];
1405
1406         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1407                                    payload_length);
1408         if (iov_ret < 0)
1409                 return -1;
1410
1411         iov_count += iov_ret;
1412
1413         padding = ((-payload_length) & 3);
1414         if (padding != 0) {
1415                 iov[iov_count].iov_base = cmd->pad_bytes;
1416                 iov[iov_count++].iov_len = padding;
1417                 rx_size += padding;
1418                 pr_debug("Receiving %u padding bytes.\n", padding);
1419         }
1420
1421         if (conn->conn_ops->DataDigest) {
1422                 iov[iov_count].iov_base = &checksum;
1423                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1424                 rx_size += ISCSI_CRC_LEN;
1425         }
1426
1427         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1428
1429         iscsit_unmap_iovec(cmd);
1430
1431         if (rx_got != rx_size)
1432                 return -1;
1433
1434         if (conn->conn_ops->DataDigest) {
1435                 u32 data_crc;
1436
1437                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1438                                                     be32_to_cpu(hdr->offset),
1439                                                     payload_length, padding,
1440                                                     cmd->pad_bytes);
1441
1442                 if (checksum != data_crc) {
1443                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1444                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1445                                 " does not match computed 0x%08x\n",
1446                                 hdr->itt, hdr->offset, payload_length,
1447                                 hdr->datasn, checksum, data_crc);
1448                         data_crc_failed = 1;
1449                 } else {
1450                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1451                                 " %u bytes of Data Out\n", checksum,
1452                                 payload_length);
1453                 }
1454         }
1455
1456         return data_crc_failed;
1457 }
1458
1459 int
1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1461                              bool data_crc_failed)
1462 {
1463         struct iscsi_conn *conn = cmd->conn;
1464         int rc, ooo_cmdsn;
1465         /*
1466          * Increment post receive data and CRC values or perform
1467          * within-command recovery.
1468          */
1469         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1470         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1471                 return 0;
1472         else if (rc == DATAOUT_SEND_R2T) {
1473                 iscsit_set_dataout_sequence_values(cmd);
1474                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1475         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1476                 /*
1477                  * Handle extra special case for out of order
1478                  * Unsolicited Data Out.
1479                  */
1480                 spin_lock_bh(&cmd->istate_lock);
1481                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1482                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1483                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1484                 spin_unlock_bh(&cmd->istate_lock);
1485
1486                 iscsit_stop_dataout_timer(cmd);
1487                 if (ooo_cmdsn)
1488                         return 0;
1489                 target_execute_cmd(&cmd->se_cmd);
1490                 return 0;
1491         } else /* DATAOUT_CANNOT_RECOVER */
1492                 return -1;
1493
1494         return 0;
1495 }
1496 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1497
1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1499 {
1500         struct iscsi_cmd *cmd = NULL;
1501         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1502         int rc;
1503         bool data_crc_failed = false;
1504
1505         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1506         if (rc < 0)
1507                 return 0;
1508         else if (!cmd)
1509                 return 0;
1510
1511         rc = iscsit_get_dataout(conn, cmd, hdr);
1512         if (rc < 0)
1513                 return rc;
1514         else if (rc > 0)
1515                 data_crc_failed = true;
1516
1517         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1518 }
1519
1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1521                          struct iscsi_nopout *hdr)
1522 {
1523         u32 payload_length = ntoh24(hdr->dlength);
1524
1525         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1526                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1527                 if (!cmd)
1528                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1529                                                  (unsigned char *)hdr);
1530
1531                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1532                                          (unsigned char *)hdr);
1533         }
1534
1535         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1536                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1537                         " not set, protocol error.\n");
1538                 if (!cmd)
1539                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540                                                  (unsigned char *)hdr);
1541
1542                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543                                          (unsigned char *)hdr);
1544         }
1545
1546         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1548                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1549                         " error.\n", payload_length,
1550                         conn->conn_ops->MaxXmitDataSegmentLength);
1551                 if (!cmd)
1552                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1553                                                  (unsigned char *)hdr);
1554
1555                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1556                                          (unsigned char *)hdr);
1557         }
1558
1559         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1560                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1561                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1562                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1563                 payload_length);
1564         /*
1565          * This is not a response to a Unsolicited NopIN, which means
1566          * it can either be a NOPOUT ping request (with a valid ITT),
1567          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568          * Either way, make sure we allocate an struct iscsi_cmd, as both
1569          * can contain ping data.
1570          */
1571         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1572                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1573                 cmd->i_state            = ISTATE_SEND_NOPIN;
1574                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575                                                 1 : 0);
1576                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1578                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1579                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1580                 cmd->data_direction     = DMA_NONE;
1581         }
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL(iscsit_setup_nop_out);
1586
1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588                            struct iscsi_nopout *hdr)
1589 {
1590         struct iscsi_cmd *cmd_p = NULL;
1591         int cmdsn_ret = 0;
1592         /*
1593          * Initiator is expecting a NopIN ping reply..
1594          */
1595         if (hdr->itt != RESERVED_ITT) {
1596                 if (!cmd)
1597                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1598                                                 (unsigned char *)hdr);
1599
1600                 spin_lock_bh(&conn->cmd_lock);
1601                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1602                 spin_unlock_bh(&conn->cmd_lock);
1603
1604                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1605
1606                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1607                         iscsit_add_cmd_to_response_queue(cmd, conn,
1608                                                          cmd->i_state);
1609                         return 0;
1610                 }
1611
1612                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1613                                 (unsigned char *)hdr, hdr->cmdsn);
1614                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1615                         return 0;
1616                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1617                         return -1;
1618
1619                 return 0;
1620         }
1621         /*
1622          * This was a response to a unsolicited NOPIN ping.
1623          */
1624         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1625                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1626                 if (!cmd_p)
1627                         return -EINVAL;
1628
1629                 iscsit_stop_nopin_response_timer(conn);
1630
1631                 cmd_p->i_state = ISTATE_REMOVE;
1632                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1633
1634                 iscsit_start_nopin_timer(conn);
1635                 return 0;
1636         }
1637         /*
1638          * Otherwise, initiator is not expecting a NOPIN is response.
1639          * Just ignore for now.
1640          */
1641         return 0;
1642 }
1643 EXPORT_SYMBOL(iscsit_process_nop_out);
1644
1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1646                                  unsigned char *buf)
1647 {
1648         unsigned char *ping_data = NULL;
1649         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1650         struct kvec *iov = NULL;
1651         u32 payload_length = ntoh24(hdr->dlength);
1652         int ret;
1653
1654         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1655         if (ret < 0)
1656                 return 0;
1657         /*
1658          * Handle NOP-OUT payload for traditional iSCSI sockets
1659          */
1660         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1661                 u32 checksum, data_crc, padding = 0;
1662                 int niov = 0, rx_got, rx_size = payload_length;
1663
1664                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1665                 if (!ping_data) {
1666                         pr_err("Unable to allocate memory for"
1667                                 " NOPOUT ping data.\n");
1668                         ret = -1;
1669                         goto out;
1670                 }
1671
1672                 iov = &cmd->iov_misc[0];
1673                 iov[niov].iov_base      = ping_data;
1674                 iov[niov++].iov_len     = payload_length;
1675
1676                 padding = ((-payload_length) & 3);
1677                 if (padding != 0) {
1678                         pr_debug("Receiving %u additional bytes"
1679                                 " for padding.\n", padding);
1680                         iov[niov].iov_base      = &cmd->pad_bytes;
1681                         iov[niov++].iov_len     = padding;
1682                         rx_size += padding;
1683                 }
1684                 if (conn->conn_ops->DataDigest) {
1685                         iov[niov].iov_base      = &checksum;
1686                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1687                         rx_size += ISCSI_CRC_LEN;
1688                 }
1689
1690                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1691                 if (rx_got != rx_size) {
1692                         ret = -1;
1693                         goto out;
1694                 }
1695
1696                 if (conn->conn_ops->DataDigest) {
1697                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1698                                         ping_data, payload_length,
1699                                         padding, cmd->pad_bytes,
1700                                         (u8 *)&data_crc);
1701
1702                         if (checksum != data_crc) {
1703                                 pr_err("Ping data CRC32C DataDigest"
1704                                 " 0x%08x does not match computed 0x%08x\n",
1705                                         checksum, data_crc);
1706                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1707                                         pr_err("Unable to recover from"
1708                                         " NOPOUT Ping DataCRC failure while in"
1709                                                 " ERL=0.\n");
1710                                         ret = -1;
1711                                         goto out;
1712                                 } else {
1713                                         /*
1714                                          * Silently drop this PDU and let the
1715                                          * initiator plug the CmdSN gap.
1716                                          */
1717                                         pr_debug("Dropping NOPOUT"
1718                                         " Command CmdSN: 0x%08x due to"
1719                                         " DataCRC error.\n", hdr->cmdsn);
1720                                         ret = 0;
1721                                         goto out;
1722                                 }
1723                         } else {
1724                                 pr_debug("Got CRC32C DataDigest"
1725                                 " 0x%08x for %u bytes of ping data.\n",
1726                                         checksum, payload_length);
1727                         }
1728                 }
1729
1730                 ping_data[payload_length] = '\0';
1731                 /*
1732                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1733                  */
1734                 cmd->buf_ptr = ping_data;
1735                 cmd->buf_ptr_size = payload_length;
1736
1737                 pr_debug("Got %u bytes of NOPOUT ping"
1738                         " data.\n", payload_length);
1739                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1740         }
1741
1742         return iscsit_process_nop_out(conn, cmd, hdr);
1743 out:
1744         if (cmd)
1745                 iscsit_free_cmd(cmd, false);
1746
1747         kfree(ping_data);
1748         return ret;
1749 }
1750
1751 int
1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753                            unsigned char *buf)
1754 {
1755         struct se_tmr_req *se_tmr;
1756         struct iscsi_tmr_req *tmr_req;
1757         struct iscsi_tm *hdr;
1758         int out_of_order_cmdsn = 0, ret;
1759         bool sess_ref = false;
1760         u8 function;
1761
1762         hdr                     = (struct iscsi_tm *) buf;
1763         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1764         function = hdr->flags;
1765
1766         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1767                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1768                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1769                 hdr->rtt, hdr->refcmdsn, conn->cid);
1770
1771         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773              hdr->rtt != RESERVED_ITT)) {
1774                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1775                 hdr->rtt = RESERVED_ITT;
1776         }
1777
1778         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1779                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1780                 pr_err("Task Management Request TASK_REASSIGN not"
1781                         " issued as immediate command, bad iSCSI Initiator"
1782                                 "implementation\n");
1783                 return iscsit_add_reject_cmd(cmd,
1784                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1785         }
1786         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1787             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1788                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1789
1790         cmd->data_direction = DMA_NONE;
1791
1792         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1793         if (!cmd->tmr_req) {
1794                 pr_err("Unable to allocate memory for"
1795                         " Task Management command!\n");
1796                 return iscsit_add_reject_cmd(cmd,
1797                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1798                                              buf);
1799         }
1800
1801         /*
1802          * TASK_REASSIGN for ERL=2 / connection stays inside of
1803          * LIO-Target $FABRIC_MOD
1804          */
1805         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1806
1807                 u8 tcm_function;
1808                 int ret;
1809
1810                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1811                                       conn->sess->se_sess, 0, DMA_NONE,
1812                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1813
1814                 target_get_sess_cmd(&cmd->se_cmd, true);
1815                 sess_ref = true;
1816
1817                 switch (function) {
1818                 case ISCSI_TM_FUNC_ABORT_TASK:
1819                         tcm_function = TMR_ABORT_TASK;
1820                         break;
1821                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1822                         tcm_function = TMR_ABORT_TASK_SET;
1823                         break;
1824                 case ISCSI_TM_FUNC_CLEAR_ACA:
1825                         tcm_function = TMR_CLEAR_ACA;
1826                         break;
1827                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1828                         tcm_function = TMR_CLEAR_TASK_SET;
1829                         break;
1830                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1831                         tcm_function = TMR_LUN_RESET;
1832                         break;
1833                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1834                         tcm_function = TMR_TARGET_WARM_RESET;
1835                         break;
1836                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1837                         tcm_function = TMR_TARGET_COLD_RESET;
1838                         break;
1839                 default:
1840                         pr_err("Unknown iSCSI TMR Function:"
1841                                " 0x%02x\n", function);
1842                         return iscsit_add_reject_cmd(cmd,
1843                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1844                 }
1845
1846                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1847                                          tcm_function, GFP_KERNEL);
1848                 if (ret < 0)
1849                         return iscsit_add_reject_cmd(cmd,
1850                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1851
1852                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1853         }
1854
1855         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1856         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1857         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1858         cmd->init_task_tag      = hdr->itt;
1859         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1860         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1861         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1862         se_tmr                  = cmd->se_cmd.se_tmr_req;
1863         tmr_req                 = cmd->tmr_req;
1864         /*
1865          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1866          */
1867         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1868                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1869                                                scsilun_to_int(&hdr->lun));
1870                 if (ret < 0) {
1871                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1872                         goto attach;
1873                 }
1874         }
1875
1876         switch (function) {
1877         case ISCSI_TM_FUNC_ABORT_TASK:
1878                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1879                 if (se_tmr->response)
1880                         goto attach;
1881                 break;
1882         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1883         case ISCSI_TM_FUNC_CLEAR_ACA:
1884         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1885         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1886                 break;
1887         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1888                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1889                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1890                         goto attach;
1891                 }
1892                 break;
1893         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1894                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1895                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1896                         goto attach;
1897                 }
1898                 break;
1899         case ISCSI_TM_FUNC_TASK_REASSIGN:
1900                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1901                 /*
1902                  * Perform sanity checks on the ExpDataSN only if the
1903                  * TASK_REASSIGN was successful.
1904                  */
1905                 if (se_tmr->response)
1906                         break;
1907
1908                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1909                         return iscsit_add_reject_cmd(cmd,
1910                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1911                 break;
1912         default:
1913                 pr_err("Unknown TMR function: 0x%02x, protocol"
1914                         " error.\n", function);
1915                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1916                 goto attach;
1917         }
1918
1919         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1920             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1921                 se_tmr->call_transport = 1;
1922 attach:
1923         spin_lock_bh(&conn->cmd_lock);
1924         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1925         spin_unlock_bh(&conn->cmd_lock);
1926
1927         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1928                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1929                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1930                         out_of_order_cmdsn = 1;
1931                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1932                         return 0;
1933                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1934                         return -1;
1935         }
1936         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1937
1938         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1939                 return 0;
1940         /*
1941          * Found the referenced task, send to transport for processing.
1942          */
1943         if (se_tmr->call_transport)
1944                 return transport_generic_handle_tmr(&cmd->se_cmd);
1945
1946         /*
1947          * Could not find the referenced LUN, task, or Task Management
1948          * command not authorized or supported.  Change state and
1949          * let the tx_thread send the response.
1950          *
1951          * For connection recovery, this is also the default action for
1952          * TMR TASK_REASSIGN.
1953          */
1954         if (sess_ref) {
1955                 pr_debug("Handle TMR, using sess_ref=true check\n");
1956                 target_put_sess_cmd(&cmd->se_cmd);
1957         }
1958
1959         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1960         return 0;
1961 }
1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1963
1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 int
1966 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967                       struct iscsi_text *hdr)
1968 {
1969         u32 payload_length = ntoh24(hdr->dlength);
1970
1971         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1972                 pr_err("Unable to accept text parameter length: %u"
1973                         "greater than MaxXmitDataSegmentLength %u.\n",
1974                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1975                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1976                                          (unsigned char *)hdr);
1977         }
1978
1979         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1980              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1981                 pr_err("Multi sequence text commands currently not supported\n");
1982                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1983                                         (unsigned char *)hdr);
1984         }
1985
1986         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1987                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1988                 hdr->exp_statsn, payload_length);
1989
1990         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1991         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1992         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1993         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1994         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1995         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1996         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1997         cmd->data_direction     = DMA_NONE;
1998         cmd->text_in_ptr        = NULL;
1999
2000         return 0;
2001 }
2002 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2003
2004 int
2005 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2006                         struct iscsi_text *hdr)
2007 {
2008         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2009         int cmdsn_ret;
2010
2011         if (!text_in) {
2012                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2013                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2014                         pr_err("Unable to locate text_in buffer for sendtargets"
2015                                " discovery\n");
2016                         goto reject;
2017                 }
2018                 goto empty_sendtargets;
2019         }
2020         if (strncmp("SendTargets", text_in, 11) != 0) {
2021                 pr_err("Received Text Data that is not"
2022                         " SendTargets, cannot continue.\n");
2023                 goto reject;
2024         }
2025         text_ptr = strchr(text_in, '=');
2026         if (!text_ptr) {
2027                 pr_err("No \"=\" separator found in Text Data,"
2028                         "  cannot continue.\n");
2029                 goto reject;
2030         }
2031         if (!strncmp("=All", text_ptr, 4)) {
2032                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2033         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2034                    !strncmp("=eui.", text_ptr, 5)) {
2035                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2036         } else {
2037                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2038                 goto reject;
2039         }
2040
2041         spin_lock_bh(&conn->cmd_lock);
2042         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2043         spin_unlock_bh(&conn->cmd_lock);
2044
2045 empty_sendtargets:
2046         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2047
2048         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2049                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2050                                 (unsigned char *)hdr, hdr->cmdsn);
2051                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2052                         return -1;
2053
2054                 return 0;
2055         }
2056
2057         return iscsit_execute_cmd(cmd, 0);
2058
2059 reject:
2060         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2061                                  (unsigned char *)hdr);
2062 }
2063 EXPORT_SYMBOL(iscsit_process_text_cmd);
2064
2065 static int
2066 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2067                        unsigned char *buf)
2068 {
2069         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2070         char *text_in = NULL;
2071         u32 payload_length = ntoh24(hdr->dlength);
2072         int rx_size, rc;
2073
2074         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2075         if (rc < 0)
2076                 return 0;
2077
2078         rx_size = payload_length;
2079         if (payload_length) {
2080                 u32 checksum = 0, data_crc = 0;
2081                 u32 padding = 0, pad_bytes = 0;
2082                 int niov = 0, rx_got;
2083                 struct kvec iov[3];
2084
2085                 text_in = kzalloc(payload_length, GFP_KERNEL);
2086                 if (!text_in) {
2087                         pr_err("Unable to allocate memory for"
2088                                 " incoming text parameters\n");
2089                         goto reject;
2090                 }
2091                 cmd->text_in_ptr = text_in;
2092
2093                 memset(iov, 0, 3 * sizeof(struct kvec));
2094                 iov[niov].iov_base      = text_in;
2095                 iov[niov++].iov_len     = payload_length;
2096
2097                 padding = ((-payload_length) & 3);
2098                 if (padding != 0) {
2099                         iov[niov].iov_base = &pad_bytes;
2100                         iov[niov++].iov_len  = padding;
2101                         rx_size += padding;
2102                         pr_debug("Receiving %u additional bytes"
2103                                         " for padding.\n", padding);
2104                 }
2105                 if (conn->conn_ops->DataDigest) {
2106                         iov[niov].iov_base      = &checksum;
2107                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2108                         rx_size += ISCSI_CRC_LEN;
2109                 }
2110
2111                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2112                 if (rx_got != rx_size)
2113                         goto reject;
2114
2115                 if (conn->conn_ops->DataDigest) {
2116                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2117                                         text_in, payload_length,
2118                                         padding, (u8 *)&pad_bytes,
2119                                         (u8 *)&data_crc);
2120
2121                         if (checksum != data_crc) {
2122                                 pr_err("Text data CRC32C DataDigest"
2123                                         " 0x%08x does not match computed"
2124                                         " 0x%08x\n", checksum, data_crc);
2125                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2126                                         pr_err("Unable to recover from"
2127                                         " Text Data digest failure while in"
2128                                                 " ERL=0.\n");
2129                                         goto reject;
2130                                 } else {
2131                                         /*
2132                                          * Silently drop this PDU and let the
2133                                          * initiator plug the CmdSN gap.
2134                                          */
2135                                         pr_debug("Dropping Text"
2136                                         " Command CmdSN: 0x%08x due to"
2137                                         " DataCRC error.\n", hdr->cmdsn);
2138                                         kfree(text_in);
2139                                         return 0;
2140                                 }
2141                         } else {
2142                                 pr_debug("Got CRC32C DataDigest"
2143                                         " 0x%08x for %u bytes of text data.\n",
2144                                                 checksum, payload_length);
2145                         }
2146                 }
2147                 text_in[payload_length - 1] = '\0';
2148                 pr_debug("Successfully read %d bytes of text"
2149                                 " data.\n", payload_length);
2150         }
2151
2152         return iscsit_process_text_cmd(conn, cmd, hdr);
2153
2154 reject:
2155         kfree(cmd->text_in_ptr);
2156         cmd->text_in_ptr = NULL;
2157         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2158 }
2159
2160 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2161 {
2162         struct iscsi_conn *conn_p;
2163         struct iscsi_session *sess = conn->sess;
2164
2165         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2166                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2167
2168         atomic_set(&sess->session_logout, 1);
2169         atomic_set(&conn->conn_logout_remove, 1);
2170         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2171
2172         iscsit_inc_conn_usage_count(conn);
2173         iscsit_inc_session_usage_count(sess);
2174
2175         spin_lock_bh(&sess->conn_lock);
2176         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2177                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2178                         continue;
2179
2180                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182         }
2183         spin_unlock_bh(&sess->conn_lock);
2184
2185         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2186
2187         return 0;
2188 }
2189
2190 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191 {
2192         struct iscsi_conn *l_conn;
2193         struct iscsi_session *sess = conn->sess;
2194
2195         pr_debug("Received logout request CLOSECONNECTION for CID:"
2196                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2197
2198         /*
2199          * A Logout Request with a CLOSECONNECTION reason code for a CID
2200          * can arrive on a connection with a differing CID.
2201          */
2202         if (conn->cid == cmd->logout_cid) {
2203                 spin_lock_bh(&conn->state_lock);
2204                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2205                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2206
2207                 atomic_set(&conn->conn_logout_remove, 1);
2208                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2209                 iscsit_inc_conn_usage_count(conn);
2210
2211                 spin_unlock_bh(&conn->state_lock);
2212         } else {
2213                 /*
2214                  * Handle all different cid CLOSECONNECTION requests in
2215                  * iscsit_logout_post_handler_diffcid() as to give enough
2216                  * time for any non immediate command's CmdSN to be
2217                  * acknowledged on the connection in question.
2218                  *
2219                  * Here we simply make sure the CID is still around.
2220                  */
2221                 l_conn = iscsit_get_conn_from_cid(sess,
2222                                 cmd->logout_cid);
2223                 if (!l_conn) {
2224                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2225                         iscsit_add_cmd_to_response_queue(cmd, conn,
2226                                         cmd->i_state);
2227                         return 0;
2228                 }
2229
2230                 iscsit_dec_conn_usage_count(l_conn);
2231         }
2232
2233         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234
2235         return 0;
2236 }
2237
2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2239 {
2240         struct iscsi_session *sess = conn->sess;
2241
2242         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2243                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2244
2245         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2246                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247                         " while ERL!=2.\n");
2248                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2249                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2250                 return 0;
2251         }
2252
2253         if (conn->cid == cmd->logout_cid) {
2254                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2255                         " with CID: %hu on CID: %hu, implementation error.\n",
2256                                 cmd->logout_cid, conn->cid);
2257                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2258                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2259                 return 0;
2260         }
2261
2262         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2263
2264         return 0;
2265 }
2266
2267 int
2268 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2269                         unsigned char *buf)
2270 {
2271         int cmdsn_ret, logout_remove = 0;
2272         u8 reason_code = 0;
2273         struct iscsi_logout *hdr;
2274         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2275
2276         hdr                     = (struct iscsi_logout *) buf;
2277         reason_code             = (hdr->flags & 0x7f);
2278
2279         if (tiqn) {
2280                 spin_lock(&tiqn->logout_stats.lock);
2281                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2282                         tiqn->logout_stats.normal_logouts++;
2283                 else
2284                         tiqn->logout_stats.abnormal_logouts++;
2285                 spin_unlock(&tiqn->logout_stats.lock);
2286         }
2287
2288         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2289                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2290                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2291                 hdr->cid, conn->cid);
2292
2293         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2294                 pr_err("Received logout request on connection that"
2295                         " is not in logged in state, ignoring request.\n");
2296                 iscsit_free_cmd(cmd, false);
2297                 return 0;
2298         }
2299
2300         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2301         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2302         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2303         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2304         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2305         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2306         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2307         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2308         cmd->logout_reason      = reason_code;
2309         cmd->data_direction     = DMA_NONE;
2310
2311         /*
2312          * We need to sleep in these cases (by returning 1) until the Logout
2313          * Response gets sent in the tx thread.
2314          */
2315         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2316            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2317             be16_to_cpu(hdr->cid) == conn->cid))
2318                 logout_remove = 1;
2319
2320         spin_lock_bh(&conn->cmd_lock);
2321         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2322         spin_unlock_bh(&conn->cmd_lock);
2323
2324         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2325                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2326
2327         /*
2328          * Immediate commands are executed, well, immediately.
2329          * Non-Immediate Logout Commands are executed in CmdSN order.
2330          */
2331         if (cmd->immediate_cmd) {
2332                 int ret = iscsit_execute_cmd(cmd, 0);
2333
2334                 if (ret < 0)
2335                         return ret;
2336         } else {
2337                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2338                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2339                         logout_remove = 0;
2340                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2341                         return -1;
2342         }
2343
2344         return logout_remove;
2345 }
2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2347
2348 static int iscsit_handle_snack(
2349         struct iscsi_conn *conn,
2350         unsigned char *buf)
2351 {
2352         struct iscsi_snack *hdr;
2353
2354         hdr                     = (struct iscsi_snack *) buf;
2355         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2356
2357         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2358                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2359                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2360                         hdr->begrun, hdr->runlength, conn->cid);
2361
2362         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2363                 pr_err("Initiator sent SNACK request while in"
2364                         " ErrorRecoveryLevel=0.\n");
2365                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2366                                          buf);
2367         }
2368         /*
2369          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2370          * call from inside iscsi_send_recovery_datain_or_r2t().
2371          */
2372         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2373         case 0:
2374                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2375                         hdr->itt,
2376                         be32_to_cpu(hdr->ttt),
2377                         be32_to_cpu(hdr->begrun),
2378                         be32_to_cpu(hdr->runlength));
2379         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2380                 return iscsit_handle_status_snack(conn, hdr->itt,
2381                         be32_to_cpu(hdr->ttt),
2382                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2383         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2384                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2385                         be32_to_cpu(hdr->begrun),
2386                         be32_to_cpu(hdr->runlength));
2387         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2388                 /* FIXME: Support R-Data SNACK */
2389                 pr_err("R-Data SNACK Not Supported.\n");
2390                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2391                                          buf);
2392         default:
2393                 pr_err("Unknown SNACK type 0x%02x, protocol"
2394                         " error.\n", hdr->flags & 0x0f);
2395                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2396                                          buf);
2397         }
2398
2399         return 0;
2400 }
2401
2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2403 {
2404         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2405             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2406                 wait_for_completion_interruptible_timeout(
2407                                         &conn->rx_half_close_comp,
2408                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2409         }
2410 }
2411
2412 static int iscsit_handle_immediate_data(
2413         struct iscsi_cmd *cmd,
2414         struct iscsi_scsi_req *hdr,
2415         u32 length)
2416 {
2417         int iov_ret, rx_got = 0, rx_size = 0;
2418         u32 checksum, iov_count = 0, padding = 0;
2419         struct iscsi_conn *conn = cmd->conn;
2420         struct kvec *iov;
2421
2422         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2423         if (iov_ret < 0)
2424                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2425
2426         rx_size = length;
2427         iov_count = iov_ret;
2428         iov = &cmd->iov_data[0];
2429
2430         padding = ((-length) & 3);
2431         if (padding != 0) {
2432                 iov[iov_count].iov_base = cmd->pad_bytes;
2433                 iov[iov_count++].iov_len = padding;
2434                 rx_size += padding;
2435         }
2436
2437         if (conn->conn_ops->DataDigest) {
2438                 iov[iov_count].iov_base         = &checksum;
2439                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2440                 rx_size += ISCSI_CRC_LEN;
2441         }
2442
2443         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2444
2445         iscsit_unmap_iovec(cmd);
2446
2447         if (rx_got != rx_size) {
2448                 iscsit_rx_thread_wait_for_tcp(conn);
2449                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2450         }
2451
2452         if (conn->conn_ops->DataDigest) {
2453                 u32 data_crc;
2454
2455                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2456                                                     cmd->write_data_done, length, padding,
2457                                                     cmd->pad_bytes);
2458
2459                 if (checksum != data_crc) {
2460                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2461                                 " does not match computed 0x%08x\n", checksum,
2462                                 data_crc);
2463
2464                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2465                                 pr_err("Unable to recover from"
2466                                         " Immediate Data digest failure while"
2467                                         " in ERL=0.\n");
2468                                 iscsit_reject_cmd(cmd,
2469                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2470                                                 (unsigned char *)hdr);
2471                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2472                         } else {
2473                                 iscsit_reject_cmd(cmd,
2474                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2475                                                 (unsigned char *)hdr);
2476                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2477                         }
2478                 } else {
2479                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2480                                 " %u bytes of Immediate Data\n", checksum,
2481                                 length);
2482                 }
2483         }
2484
2485         cmd->write_data_done += length;
2486
2487         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2488                 spin_lock_bh(&cmd->istate_lock);
2489                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2490                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2491                 spin_unlock_bh(&cmd->istate_lock);
2492         }
2493
2494         return IMMEDIATE_DATA_NORMAL_OPERATION;
2495 }
2496
2497 /*
2498  *      Called with sess->conn_lock held.
2499  */
2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2501         with active network interface */
2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2503 {
2504         struct iscsi_cmd *cmd;
2505         struct iscsi_conn *conn_p;
2506         bool found = false;
2507
2508         /*
2509          * Only send a Asynchronous Message on connections whos network
2510          * interface is still functional.
2511          */
2512         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2513                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2514                         iscsit_inc_conn_usage_count(conn_p);
2515                         found = true;
2516                         break;
2517                 }
2518         }
2519
2520         if (!found)
2521                 return;
2522
2523         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2524         if (!cmd) {
2525                 iscsit_dec_conn_usage_count(conn_p);
2526                 return;
2527         }
2528
2529         cmd->logout_cid = conn->cid;
2530         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2531         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2532
2533         spin_lock_bh(&conn_p->cmd_lock);
2534         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2535         spin_unlock_bh(&conn_p->cmd_lock);
2536
2537         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2538         iscsit_dec_conn_usage_count(conn_p);
2539 }
2540
2541 static int iscsit_send_conn_drop_async_message(
2542         struct iscsi_cmd *cmd,
2543         struct iscsi_conn *conn)
2544 {
2545         struct iscsi_async *hdr;
2546
2547         cmd->tx_size = ISCSI_HDR_LEN;
2548         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2549
2550         hdr                     = (struct iscsi_async *) cmd->pdu;
2551         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2552         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2553         cmd->init_task_tag      = RESERVED_ITT;
2554         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2555         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2556         cmd->stat_sn            = conn->stat_sn++;
2557         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2558         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2559         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2560         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2561         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2562         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2563         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2564
2565         if (conn->conn_ops->HeaderDigest) {
2566                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2567
2568                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2569                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2570
2571                 cmd->tx_size += ISCSI_CRC_LEN;
2572                 pr_debug("Attaching CRC32C HeaderDigest to"
2573                         " Async Message 0x%08x\n", *header_digest);
2574         }
2575
2576         cmd->iov_misc[0].iov_base       = cmd->pdu;
2577         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2578         cmd->iov_misc_count             = 1;
2579
2580         pr_debug("Sending Connection Dropped Async Message StatSN:"
2581                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2582                         cmd->logout_cid, conn->cid);
2583         return 0;
2584 }
2585
2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2587 {
2588         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590                 wait_for_completion_interruptible_timeout(
2591                                         &conn->tx_half_close_comp,
2592                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2593         }
2594 }
2595
2596 static void
2597 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2598                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2599                         bool set_statsn)
2600 {
2601         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2602         hdr->flags              = datain->flags;
2603         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2604                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2605                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2606                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2608                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2609                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2610                 }
2611         }
2612         hton24(hdr->dlength, datain->length);
2613         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2614                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2615                                 (struct scsi_lun *)&hdr->lun);
2616         else
2617                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2618
2619         hdr->itt                = cmd->init_task_tag;
2620
2621         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2622                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2623         else
2624                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2625         if (set_statsn)
2626                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2627         else
2628                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2629
2630         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2631         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2632         hdr->datasn             = cpu_to_be32(datain->data_sn);
2633         hdr->offset             = cpu_to_be32(datain->offset);
2634
2635         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2636                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2637                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2638                 ntohl(hdr->offset), datain->length, conn->cid);
2639 }
2640
2641 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2642 {
2643         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2644         struct iscsi_datain datain;
2645         struct iscsi_datain_req *dr;
2646         struct kvec *iov;
2647         u32 iov_count = 0, tx_size = 0;
2648         int eodr = 0, ret, iov_ret;
2649         bool set_statsn = false;
2650
2651         memset(&datain, 0, sizeof(struct iscsi_datain));
2652         dr = iscsit_get_datain_values(cmd, &datain);
2653         if (!dr) {
2654                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2655                                 cmd->init_task_tag);
2656                 return -1;
2657         }
2658         /*
2659          * Be paranoid and double check the logic for now.
2660          */
2661         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2662                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2663                         " datain.length: %u exceeds cmd->data_length: %u\n",
2664                         cmd->init_task_tag, datain.offset, datain.length,
2665                         cmd->se_cmd.data_length);
2666                 return -1;
2667         }
2668
2669         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2670         /*
2671          * Special case for successfully execution w/ both DATAIN
2672          * and Sense Data.
2673          */
2674         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2675             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2676                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2677         else {
2678                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2679                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2680                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2681                         cmd->stat_sn = conn->stat_sn++;
2682                         set_statsn = true;
2683                 } else if (dr->dr_complete ==
2684                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2685                         set_statsn = true;
2686         }
2687
2688         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2689
2690         iov = &cmd->iov_data[0];
2691         iov[iov_count].iov_base = cmd->pdu;
2692         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2693         tx_size += ISCSI_HDR_LEN;
2694
2695         if (conn->conn_ops->HeaderDigest) {
2696                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2697
2698                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2699                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2700
2701                 iov[0].iov_len += ISCSI_CRC_LEN;
2702                 tx_size += ISCSI_CRC_LEN;
2703
2704                 pr_debug("Attaching CRC32 HeaderDigest"
2705                         " for DataIN PDU 0x%08x\n", *header_digest);
2706         }
2707
2708         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2709                                 datain.offset, datain.length);
2710         if (iov_ret < 0)
2711                 return -1;
2712
2713         iov_count += iov_ret;
2714         tx_size += datain.length;
2715
2716         cmd->padding = ((-datain.length) & 3);
2717         if (cmd->padding) {
2718                 iov[iov_count].iov_base         = cmd->pad_bytes;
2719                 iov[iov_count++].iov_len        = cmd->padding;
2720                 tx_size += cmd->padding;
2721
2722                 pr_debug("Attaching %u padding bytes\n",
2723                                 cmd->padding);
2724         }
2725         if (conn->conn_ops->DataDigest) {
2726                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2727                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2728
2729                 iov[iov_count].iov_base = &cmd->data_crc;
2730                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2731                 tx_size += ISCSI_CRC_LEN;
2732
2733                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2734                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2735         }
2736
2737         cmd->iov_data_count = iov_count;
2738         cmd->tx_size = tx_size;
2739
2740         ret = iscsit_fe_sendpage_sg(cmd, conn);
2741
2742         iscsit_unmap_iovec(cmd);
2743
2744         if (ret < 0) {
2745                 iscsit_tx_thread_wait_for_tcp(conn);
2746                 return ret;
2747         }
2748
2749         if (dr->dr_complete) {
2750                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2751                                 2 : 1;
2752                 iscsit_free_datain_req(cmd, dr);
2753         }
2754
2755         return eodr;
2756 }
2757
2758 int
2759 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2760                         struct iscsi_logout_rsp *hdr)
2761 {
2762         struct iscsi_conn *logout_conn = NULL;
2763         struct iscsi_conn_recovery *cr = NULL;
2764         struct iscsi_session *sess = conn->sess;
2765         /*
2766          * The actual shutting down of Sessions and/or Connections
2767          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2768          * is done in scsi_logout_post_handler().
2769          */
2770         switch (cmd->logout_reason) {
2771         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2772                 pr_debug("iSCSI session logout successful, setting"
2773                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2774                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2775                 break;
2776         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2777                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2778                         break;
2779                 /*
2780                  * For CLOSECONNECTION logout requests carrying
2781                  * a matching logout CID -> local CID, the reference
2782                  * for the local CID will have been incremented in
2783                  * iscsi_logout_closeconnection().
2784                  *
2785                  * For CLOSECONNECTION logout requests carrying
2786                  * a different CID than the connection it arrived
2787                  * on, the connection responding to cmd->logout_cid
2788                  * is stopped in iscsit_logout_post_handler_diffcid().
2789                  */
2790
2791                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2792                         " successful.\n", cmd->logout_cid, conn->cid);
2793                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2794                 break;
2795         case ISCSI_LOGOUT_REASON_RECOVERY:
2796                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2797                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2798                         break;
2799                 /*
2800                  * If the connection is still active from our point of view
2801                  * force connection recovery to occur.
2802                  */
2803                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2804                                 cmd->logout_cid);
2805                 if (logout_conn) {
2806                         iscsit_connection_reinstatement_rcfr(logout_conn);
2807                         iscsit_dec_conn_usage_count(logout_conn);
2808                 }
2809
2810                 cr = iscsit_get_inactive_connection_recovery_entry(
2811                                 conn->sess, cmd->logout_cid);
2812                 if (!cr) {
2813                         pr_err("Unable to locate CID: %hu for"
2814                         " REMOVECONNFORRECOVERY Logout Request.\n",
2815                                 cmd->logout_cid);
2816                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2817                         break;
2818                 }
2819
2820                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2821
2822                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2823                         " for recovery for CID: %hu on CID: %hu successful.\n",
2824                                 cmd->logout_cid, conn->cid);
2825                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2826                 break;
2827         default:
2828                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2829                                 cmd->logout_reason);
2830                 return -1;
2831         }
2832
2833         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2834         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2835         hdr->response           = cmd->logout_response;
2836         hdr->itt                = cmd->init_task_tag;
2837         cmd->stat_sn            = conn->stat_sn++;
2838         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2839
2840         iscsit_increment_maxcmdsn(cmd, conn->sess);
2841         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2842         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2843
2844         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2845                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2846                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2847                 cmd->logout_cid, conn->cid);
2848
2849         return 0;
2850 }
2851 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2852
2853 static int
2854 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2855 {
2856         struct kvec *iov;
2857         int niov = 0, tx_size, rc;
2858
2859         rc = iscsit_build_logout_rsp(cmd, conn,
2860                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2861         if (rc < 0)
2862                 return rc;
2863
2864         tx_size = ISCSI_HDR_LEN;
2865         iov = &cmd->iov_misc[0];
2866         iov[niov].iov_base      = cmd->pdu;
2867         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2868
2869         if (conn->conn_ops->HeaderDigest) {
2870                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2871
2872                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2873                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2874
2875                 iov[0].iov_len += ISCSI_CRC_LEN;
2876                 tx_size += ISCSI_CRC_LEN;
2877                 pr_debug("Attaching CRC32C HeaderDigest to"
2878                         " Logout Response 0x%08x\n", *header_digest);
2879         }
2880         cmd->iov_misc_count = niov;
2881         cmd->tx_size = tx_size;
2882
2883         return 0;
2884 }
2885
2886 void
2887 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2888                        struct iscsi_nopin *hdr, bool nopout_response)
2889 {
2890         hdr->opcode             = ISCSI_OP_NOOP_IN;
2891         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2892         hton24(hdr->dlength, cmd->buf_ptr_size);
2893         if (nopout_response)
2894                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2895         hdr->itt                = cmd->init_task_tag;
2896         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2897         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2898                                   conn->stat_sn;
2899         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2900
2901         if (nopout_response)
2902                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2903
2904         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2905         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2906
2907         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2908                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2909                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2910                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2911 }
2912 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2913
2914 /*
2915  *      Unsolicited NOPIN, either requesting a response or not.
2916  */
2917 static int iscsit_send_unsolicited_nopin(
2918         struct iscsi_cmd *cmd,
2919         struct iscsi_conn *conn,
2920         int want_response)
2921 {
2922         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2923         int tx_size = ISCSI_HDR_LEN, ret;
2924
2925         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2926
2927         if (conn->conn_ops->HeaderDigest) {
2928                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2929
2930                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2931                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2932
2933                 tx_size += ISCSI_CRC_LEN;
2934                 pr_debug("Attaching CRC32C HeaderDigest to"
2935                         " NopIN 0x%08x\n", *header_digest);
2936         }
2937
2938         cmd->iov_misc[0].iov_base       = cmd->pdu;
2939         cmd->iov_misc[0].iov_len        = tx_size;
2940         cmd->iov_misc_count     = 1;
2941         cmd->tx_size            = tx_size;
2942
2943         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2944                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2945
2946         ret = iscsit_send_tx_data(cmd, conn, 1);
2947         if (ret < 0) {
2948                 iscsit_tx_thread_wait_for_tcp(conn);
2949                 return ret;
2950         }
2951
2952         spin_lock_bh(&cmd->istate_lock);
2953         cmd->i_state = want_response ?
2954                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2955         spin_unlock_bh(&cmd->istate_lock);
2956
2957         return 0;
2958 }
2959
2960 static int
2961 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2962 {
2963         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2964         struct kvec *iov;
2965         u32 padding = 0;
2966         int niov = 0, tx_size;
2967
2968         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2969
2970         tx_size = ISCSI_HDR_LEN;
2971         iov = &cmd->iov_misc[0];
2972         iov[niov].iov_base      = cmd->pdu;
2973         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2974
2975         if (conn->conn_ops->HeaderDigest) {
2976                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2977
2978                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2979                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2980
2981                 iov[0].iov_len += ISCSI_CRC_LEN;
2982                 tx_size += ISCSI_CRC_LEN;
2983                 pr_debug("Attaching CRC32C HeaderDigest"
2984                         " to NopIn 0x%08x\n", *header_digest);
2985         }
2986
2987         /*
2988          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2989          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2990          */
2991         if (cmd->buf_ptr_size) {
2992                 iov[niov].iov_base      = cmd->buf_ptr;
2993                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2994                 tx_size += cmd->buf_ptr_size;
2995
2996                 pr_debug("Echoing back %u bytes of ping"
2997                         " data.\n", cmd->buf_ptr_size);
2998
2999                 padding = ((-cmd->buf_ptr_size) & 3);
3000                 if (padding != 0) {
3001                         iov[niov].iov_base = &cmd->pad_bytes;
3002                         iov[niov++].iov_len = padding;
3003                         tx_size += padding;
3004                         pr_debug("Attaching %u additional"
3005                                 " padding bytes.\n", padding);
3006                 }
3007                 if (conn->conn_ops->DataDigest) {
3008                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3009                                 cmd->buf_ptr, cmd->buf_ptr_size,
3010                                 padding, (u8 *)&cmd->pad_bytes,
3011                                 (u8 *)&cmd->data_crc);
3012
3013                         iov[niov].iov_base = &cmd->data_crc;
3014                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3015                         tx_size += ISCSI_CRC_LEN;
3016                         pr_debug("Attached DataDigest for %u"
3017                                 " bytes of ping data, CRC 0x%08x\n",
3018                                 cmd->buf_ptr_size, cmd->data_crc);
3019                 }
3020         }
3021
3022         cmd->iov_misc_count = niov;
3023         cmd->tx_size = tx_size;
3024
3025         return 0;
3026 }
3027
3028 static int iscsit_send_r2t(
3029         struct iscsi_cmd *cmd,
3030         struct iscsi_conn *conn)
3031 {
3032         int tx_size = 0;
3033         struct iscsi_r2t *r2t;
3034         struct iscsi_r2t_rsp *hdr;
3035         int ret;
3036
3037         r2t = iscsit_get_r2t_from_list(cmd);
3038         if (!r2t)
3039                 return -1;
3040
3041         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3042         memset(hdr, 0, ISCSI_HDR_LEN);
3043         hdr->opcode             = ISCSI_OP_R2T;
3044         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3045         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3046                         (struct scsi_lun *)&hdr->lun);
3047         hdr->itt                = cmd->init_task_tag;
3048         r2t->targ_xfer_tag      = session_get_next_ttt(conn->sess);
3049         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3050         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3051         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3052         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3053         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3054         hdr->data_offset        = cpu_to_be32(r2t->offset);
3055         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3056
3057         cmd->iov_misc[0].iov_base       = cmd->pdu;
3058         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3059         tx_size += ISCSI_HDR_LEN;
3060
3061         if (conn->conn_ops->HeaderDigest) {
3062                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3063
3064                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3065                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3066
3067                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3068                 tx_size += ISCSI_CRC_LEN;
3069                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3070                         " PDU 0x%08x\n", *header_digest);
3071         }
3072
3073         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3074                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3075                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3076                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3077                         r2t->offset, r2t->xfer_len, conn->cid);
3078
3079         cmd->iov_misc_count = 1;
3080         cmd->tx_size = tx_size;
3081
3082         spin_lock_bh(&cmd->r2t_lock);
3083         r2t->sent_r2t = 1;
3084         spin_unlock_bh(&cmd->r2t_lock);
3085
3086         ret = iscsit_send_tx_data(cmd, conn, 1);
3087         if (ret < 0) {
3088                 iscsit_tx_thread_wait_for_tcp(conn);
3089                 return ret;
3090         }
3091
3092         spin_lock_bh(&cmd->dataout_timeout_lock);
3093         iscsit_start_dataout_timer(cmd, conn);
3094         spin_unlock_bh(&cmd->dataout_timeout_lock);
3095
3096         return 0;
3097 }
3098
3099 /*
3100  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3101  *              connection recovery.
3102  */
3103 int iscsit_build_r2ts_for_cmd(
3104         struct iscsi_conn *conn,
3105         struct iscsi_cmd *cmd,
3106         bool recovery)
3107 {
3108         int first_r2t = 1;
3109         u32 offset = 0, xfer_len = 0;
3110
3111         spin_lock_bh(&cmd->r2t_lock);
3112         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3113                 spin_unlock_bh(&cmd->r2t_lock);
3114                 return 0;
3115         }
3116
3117         if (conn->sess->sess_ops->DataSequenceInOrder &&
3118             !recovery)
3119                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3120
3121         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3122                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3123                         offset = cmd->r2t_offset;
3124
3125                         if (first_r2t && recovery) {
3126                                 int new_data_end = offset +
3127                                         conn->sess->sess_ops->MaxBurstLength -
3128                                         cmd->next_burst_len;
3129
3130                                 if (new_data_end > cmd->se_cmd.data_length)
3131                                         xfer_len = cmd->se_cmd.data_length - offset;
3132                                 else
3133                                         xfer_len =
3134                                                 conn->sess->sess_ops->MaxBurstLength -
3135                                                 cmd->next_burst_len;
3136                         } else {
3137                                 int new_data_end = offset +
3138                                         conn->sess->sess_ops->MaxBurstLength;
3139
3140                                 if (new_data_end > cmd->se_cmd.data_length)
3141                                         xfer_len = cmd->se_cmd.data_length - offset;
3142                                 else
3143                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3144                         }
3145                         cmd->r2t_offset += xfer_len;
3146
3147                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3148                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3149                 } else {
3150                         struct iscsi_seq *seq;
3151
3152                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3153                         if (!seq) {
3154                                 spin_unlock_bh(&cmd->r2t_lock);
3155                                 return -1;
3156                         }
3157
3158                         offset = seq->offset;
3159                         xfer_len = seq->xfer_len;
3160
3161                         if (cmd->seq_send_order == cmd->seq_count)
3162                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3163                 }
3164                 cmd->outstanding_r2ts++;
3165                 first_r2t = 0;
3166
3167                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3168                         spin_unlock_bh(&cmd->r2t_lock);
3169                         return -1;
3170                 }
3171
3172                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3173                         break;
3174         }
3175         spin_unlock_bh(&cmd->r2t_lock);
3176
3177         return 0;
3178 }
3179
3180 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3181                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3182 {
3183         if (inc_stat_sn)
3184                 cmd->stat_sn = conn->stat_sn++;
3185
3186         atomic_long_inc(&conn->sess->rsp_pdus);
3187
3188         memset(hdr, 0, ISCSI_HDR_LEN);
3189         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3190         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3191         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3192                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3193                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3194         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3195                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3196                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3197         }
3198         hdr->response           = cmd->iscsi_response;
3199         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3200         hdr->itt                = cmd->init_task_tag;
3201         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3202
3203         iscsit_increment_maxcmdsn(cmd, conn->sess);
3204         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3205         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3206
3207         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3208                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3209                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3210                 cmd->se_cmd.scsi_status, conn->cid);
3211 }
3212 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3213
3214 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3215 {
3216         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3217         struct kvec *iov;
3218         u32 padding = 0, tx_size = 0;
3219         int iov_count = 0;
3220         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3221
3222         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3223
3224         iov = &cmd->iov_misc[0];
3225         iov[iov_count].iov_base = cmd->pdu;
3226         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3227         tx_size += ISCSI_HDR_LEN;
3228
3229         /*
3230          * Attach SENSE DATA payload to iSCSI Response PDU
3231          */
3232         if (cmd->se_cmd.sense_buffer &&
3233            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3234             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3235                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3236                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3237
3238                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3239                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3240                 iov[iov_count].iov_base = cmd->sense_buffer;
3241                 iov[iov_count++].iov_len =
3242                                 (cmd->se_cmd.scsi_sense_length + padding);
3243                 tx_size += cmd->se_cmd.scsi_sense_length;
3244
3245                 if (padding) {
3246                         memset(cmd->sense_buffer +
3247                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3248                         tx_size += padding;
3249                         pr_debug("Adding %u bytes of padding to"
3250                                 " SENSE.\n", padding);
3251                 }
3252
3253                 if (conn->conn_ops->DataDigest) {
3254                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3255                                 cmd->sense_buffer,
3256                                 (cmd->se_cmd.scsi_sense_length + padding),
3257                                 0, NULL, (u8 *)&cmd->data_crc);
3258
3259                         iov[iov_count].iov_base    = &cmd->data_crc;
3260                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3261                         tx_size += ISCSI_CRC_LEN;
3262
3263                         pr_debug("Attaching CRC32 DataDigest for"
3264                                 " SENSE, %u bytes CRC 0x%08x\n",
3265                                 (cmd->se_cmd.scsi_sense_length + padding),
3266                                 cmd->data_crc);
3267                 }
3268
3269                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3270                                 " Response PDU\n",
3271                                 cmd->se_cmd.scsi_sense_length);
3272         }
3273
3274         if (conn->conn_ops->HeaderDigest) {
3275                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3276
3277                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3278                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3279
3280                 iov[0].iov_len += ISCSI_CRC_LEN;
3281                 tx_size += ISCSI_CRC_LEN;
3282                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3283                                 " PDU 0x%08x\n", *header_digest);
3284         }
3285
3286         cmd->iov_misc_count = iov_count;
3287         cmd->tx_size = tx_size;
3288
3289         return 0;
3290 }
3291
3292 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3293 {
3294         switch (se_tmr->response) {
3295         case TMR_FUNCTION_COMPLETE:
3296                 return ISCSI_TMF_RSP_COMPLETE;
3297         case TMR_TASK_DOES_NOT_EXIST:
3298                 return ISCSI_TMF_RSP_NO_TASK;
3299         case TMR_LUN_DOES_NOT_EXIST:
3300                 return ISCSI_TMF_RSP_NO_LUN;
3301         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3302                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3303         case TMR_FUNCTION_REJECTED:
3304         default:
3305                 return ISCSI_TMF_RSP_REJECTED;
3306         }
3307 }
3308
3309 void
3310 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3311                           struct iscsi_tm_rsp *hdr)
3312 {
3313         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3314
3315         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3316         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3317         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3318         hdr->itt                = cmd->init_task_tag;
3319         cmd->stat_sn            = conn->stat_sn++;
3320         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3321
3322         iscsit_increment_maxcmdsn(cmd, conn->sess);
3323         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3324         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3325
3326         pr_debug("Built Task Management Response ITT: 0x%08x,"
3327                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3328                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3329 }
3330 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3331
3332 static int
3333 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3334 {
3335         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3336         u32 tx_size = 0;
3337
3338         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3339
3340         cmd->iov_misc[0].iov_base       = cmd->pdu;
3341         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3342         tx_size += ISCSI_HDR_LEN;
3343
3344         if (conn->conn_ops->HeaderDigest) {
3345                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3346
3347                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3348                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3349
3350                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3351                 tx_size += ISCSI_CRC_LEN;
3352                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3353                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3354         }
3355
3356         cmd->iov_misc_count = 1;
3357         cmd->tx_size = tx_size;
3358
3359         return 0;
3360 }
3361
3362 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3363 {
3364         bool ret = false;
3365
3366         if (np->np_sockaddr.ss_family == AF_INET6) {
3367                 const struct sockaddr_in6 sin6 = {
3368                         .sin6_addr = IN6ADDR_ANY_INIT };
3369                 struct sockaddr_in6 *sock_in6 =
3370                          (struct sockaddr_in6 *)&np->np_sockaddr;
3371
3372                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3373                                 sin6.sin6_addr.s6_addr, 16))
3374                         ret = true;
3375         } else {
3376                 struct sockaddr_in * sock_in =
3377                         (struct sockaddr_in *)&np->np_sockaddr;
3378
3379                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3380                         ret = true;
3381         }
3382
3383         return ret;
3384 }
3385
3386 #define SENDTARGETS_BUF_LIMIT 32768U
3387
3388 static int
3389 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3390                                   enum iscsit_transport_type network_transport,
3391                                   int skip_bytes, bool *completed)
3392 {
3393         char *payload = NULL;
3394         struct iscsi_conn *conn = cmd->conn;
3395         struct iscsi_portal_group *tpg;
3396         struct iscsi_tiqn *tiqn;
3397         struct iscsi_tpg_np *tpg_np;
3398         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3399         int target_name_printed;
3400         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3401         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3402
3403         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3404                          SENDTARGETS_BUF_LIMIT);
3405
3406         payload = kzalloc(buffer_len, GFP_KERNEL);
3407         if (!payload) {
3408                 pr_err("Unable to allocate memory for sendtargets"
3409                                 " response.\n");
3410                 return -ENOMEM;
3411         }
3412         /*
3413          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3414          * explicit case..
3415          */
3416         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3417                 text_ptr = strchr(text_in, '=');
3418                 if (!text_ptr) {
3419                         pr_err("Unable to locate '=' string in text_in:"
3420                                " %s\n", text_in);
3421                         kfree(payload);
3422                         return -EINVAL;
3423                 }
3424                 /*
3425                  * Skip over '=' character..
3426                  */
3427                 text_ptr += 1;
3428         }
3429
3430         spin_lock(&tiqn_lock);
3431         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3432                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3433                      strcmp(tiqn->tiqn, text_ptr)) {
3434                         continue;
3435                 }
3436
3437                 target_name_printed = 0;
3438
3439                 spin_lock(&tiqn->tiqn_tpg_lock);
3440                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3441
3442                         /* If demo_mode_discovery=0 and generate_node_acls=0
3443                          * (demo mode dislabed) do not return
3444                          * TargetName+TargetAddress unless a NodeACL exists.
3445                          */
3446
3447                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3448                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3449                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3450                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3451                                 continue;
3452                         }
3453
3454                         spin_lock(&tpg->tpg_state_lock);
3455                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3456                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3457                                 spin_unlock(&tpg->tpg_state_lock);
3458                                 continue;
3459                         }
3460                         spin_unlock(&tpg->tpg_state_lock);
3461
3462                         spin_lock(&tpg->tpg_np_lock);
3463                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3464                                                 tpg_np_list) {
3465                                 struct iscsi_np *np = tpg_np->tpg_np;
3466                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3467                                 char *fmt_str;
3468
3469                                 if (np->np_network_transport != network_transport)
3470                                         continue;
3471
3472                                 if (!target_name_printed) {
3473                                         len = sprintf(buf, "TargetName=%s",
3474                                                       tiqn->tiqn);
3475                                         len += 1;
3476
3477                                         if ((len + payload_len) > buffer_len) {
3478                                                 spin_unlock(&tpg->tpg_np_lock);
3479                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3480                                                 end_of_buf = 1;
3481                                                 goto eob;
3482                                         }
3483
3484                                         if (skip_bytes && len <= skip_bytes) {
3485                                                 skip_bytes -= len;
3486                                         } else {
3487                                                 memcpy(payload + payload_len, buf, len);
3488                                                 payload_len += len;
3489                                                 target_name_printed = 1;
3490                                                 if (len > skip_bytes)
3491                                                         skip_bytes = 0;
3492                                         }
3493                                 }
3494
3495                                 if (np->np_sockaddr.ss_family == AF_INET6)
3496                                         fmt_str = "TargetAddress=[%s]:%hu,%hu";
3497                                 else
3498                                         fmt_str = "TargetAddress=%s:%hu,%hu";
3499
3500                                 len = sprintf(buf, fmt_str,
3501                                         inaddr_any ? conn->local_ip : np->np_ip,
3502                                         np->np_port,
3503                                         tpg->tpgt);
3504                                 len += 1;
3505
3506                                 if ((len + payload_len) > buffer_len) {
3507                                         spin_unlock(&tpg->tpg_np_lock);
3508                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3509                                         end_of_buf = 1;
3510                                         goto eob;
3511                                 }
3512
3513                                 if (skip_bytes && len <= skip_bytes) {
3514                                         skip_bytes -= len;
3515                                 } else {
3516                                         memcpy(payload + payload_len, buf, len);
3517                                         payload_len += len;
3518                                         if (len > skip_bytes)
3519                                                 skip_bytes = 0;
3520                                 }
3521                         }
3522                         spin_unlock(&tpg->tpg_np_lock);
3523                 }
3524                 spin_unlock(&tiqn->tiqn_tpg_lock);
3525 eob:
3526                 if (end_of_buf) {
3527                         *completed = false;
3528                         break;
3529                 }
3530
3531                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3532                         break;
3533         }
3534         spin_unlock(&tiqn_lock);
3535
3536         cmd->buf_ptr = payload;
3537
3538         return payload_len;
3539 }
3540
3541 int
3542 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3543                       struct iscsi_text_rsp *hdr,
3544                       enum iscsit_transport_type network_transport)
3545 {
3546         int text_length, padding;
3547         bool completed = true;
3548
3549         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3550                                                         cmd->read_data_done,
3551                                                         &completed);
3552         if (text_length < 0)
3553                 return text_length;
3554
3555         if (completed) {
3556                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3557         } else {
3558                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3559                 cmd->read_data_done += text_length;
3560                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3561                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3562         }
3563         hdr->opcode = ISCSI_OP_TEXT_RSP;
3564         padding = ((-text_length) & 3);
3565         hton24(hdr->dlength, text_length);
3566         hdr->itt = cmd->init_task_tag;
3567         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3568         cmd->stat_sn = conn->stat_sn++;
3569         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3570
3571         iscsit_increment_maxcmdsn(cmd, conn->sess);
3572         /*
3573          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3574          * correctly increment MaxCmdSN for each response answering a
3575          * non immediate text request with a valid CmdSN.
3576          */
3577         cmd->maxcmdsn_inc = 0;
3578         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3579         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3580
3581         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3582                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3583                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3584                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3585                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3586
3587         return text_length + padding;
3588 }
3589 EXPORT_SYMBOL(iscsit_build_text_rsp);
3590
3591 static int iscsit_send_text_rsp(
3592         struct iscsi_cmd *cmd,
3593         struct iscsi_conn *conn)
3594 {
3595         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3596         struct kvec *iov;
3597         u32 tx_size = 0;
3598         int text_length, iov_count = 0, rc;
3599
3600         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3601         if (rc < 0)
3602                 return rc;
3603
3604         text_length = rc;
3605         iov = &cmd->iov_misc[0];
3606         iov[iov_count].iov_base = cmd->pdu;
3607         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3608         iov[iov_count].iov_base = cmd->buf_ptr;
3609         iov[iov_count++].iov_len = text_length;
3610
3611         tx_size += (ISCSI_HDR_LEN + text_length);
3612
3613         if (conn->conn_ops->HeaderDigest) {
3614                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3615
3616                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3617                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3618
3619                 iov[0].iov_len += ISCSI_CRC_LEN;
3620                 tx_size += ISCSI_CRC_LEN;
3621                 pr_debug("Attaching CRC32 HeaderDigest for"
3622                         " Text Response PDU 0x%08x\n", *header_digest);
3623         }
3624
3625         if (conn->conn_ops->DataDigest) {
3626                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3627                                 cmd->buf_ptr, text_length,
3628                                 0, NULL, (u8 *)&cmd->data_crc);
3629
3630                 iov[iov_count].iov_base = &cmd->data_crc;
3631                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3632                 tx_size += ISCSI_CRC_LEN;
3633
3634                 pr_debug("Attaching DataDigest for %u bytes of text"
3635                         " data, CRC 0x%08x\n", text_length,
3636                         cmd->data_crc);
3637         }
3638
3639         cmd->iov_misc_count = iov_count;
3640         cmd->tx_size = tx_size;
3641
3642         return 0;
3643 }
3644
3645 void
3646 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3647                     struct iscsi_reject *hdr)
3648 {
3649         hdr->opcode             = ISCSI_OP_REJECT;
3650         hdr->reason             = cmd->reject_reason;
3651         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3652         hton24(hdr->dlength, ISCSI_HDR_LEN);
3653         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3654         cmd->stat_sn            = conn->stat_sn++;
3655         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3656         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3657         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3658
3659 }
3660 EXPORT_SYMBOL(iscsit_build_reject);
3661
3662 static int iscsit_send_reject(
3663         struct iscsi_cmd *cmd,
3664         struct iscsi_conn *conn)
3665 {
3666         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3667         struct kvec *iov;
3668         u32 iov_count = 0, tx_size;
3669
3670         iscsit_build_reject(cmd, conn, hdr);
3671
3672         iov = &cmd->iov_misc[0];
3673         iov[iov_count].iov_base = cmd->pdu;
3674         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3675         iov[iov_count].iov_base = cmd->buf_ptr;
3676         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3677
3678         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3679
3680         if (conn->conn_ops->HeaderDigest) {
3681                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3682
3683                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3684                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3685
3686                 iov[0].iov_len += ISCSI_CRC_LEN;
3687                 tx_size += ISCSI_CRC_LEN;
3688                 pr_debug("Attaching CRC32 HeaderDigest for"
3689                         " REJECT PDU 0x%08x\n", *header_digest);
3690         }
3691
3692         if (conn->conn_ops->DataDigest) {
3693                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3694                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3695
3696                 iov[iov_count].iov_base = &cmd->data_crc;
3697                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3698                 tx_size += ISCSI_CRC_LEN;
3699                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3700                                 " PDU 0x%08x\n", cmd->data_crc);
3701         }
3702
3703         cmd->iov_misc_count = iov_count;
3704         cmd->tx_size = tx_size;
3705
3706         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3707                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3708
3709         return 0;
3710 }
3711
3712 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3713 {
3714         int ord, cpu;
3715         /*
3716          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3717          * within iscsit_start_kthreads()
3718          *
3719          * Here we use bitmap_id to determine which CPU that this
3720          * iSCSI connection's RX/TX threads will be scheduled to
3721          * execute upon.
3722          */
3723         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3724         for_each_online_cpu(cpu) {
3725                 if (ord-- == 0) {
3726                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3727                         return;
3728                 }
3729         }
3730         /*
3731          * This should never be reached..
3732          */
3733         dump_stack();
3734         cpumask_setall(conn->conn_cpumask);
3735 }
3736
3737 static inline void iscsit_thread_check_cpumask(
3738         struct iscsi_conn *conn,
3739         struct task_struct *p,
3740         int mode)
3741 {
3742         /*
3743          * mode == 1 signals iscsi_target_tx_thread() usage.
3744          * mode == 0 signals iscsi_target_rx_thread() usage.
3745          */
3746         if (mode == 1) {
3747                 if (!conn->conn_tx_reset_cpumask)
3748                         return;
3749                 conn->conn_tx_reset_cpumask = 0;
3750         } else {
3751                 if (!conn->conn_rx_reset_cpumask)
3752                         return;
3753                 conn->conn_rx_reset_cpumask = 0;
3754         }
3755         /*
3756          * Update the CPU mask for this single kthread so that
3757          * both TX and RX kthreads are scheduled to run on the
3758          * same CPU.
3759          */
3760         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3761 }
3762
3763 static int
3764 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3765 {
3766         int ret;
3767
3768         switch (state) {
3769         case ISTATE_SEND_R2T:
3770                 ret = iscsit_send_r2t(cmd, conn);
3771                 if (ret < 0)
3772                         goto err;
3773                 break;
3774         case ISTATE_REMOVE:
3775                 spin_lock_bh(&conn->cmd_lock);
3776                 list_del_init(&cmd->i_conn_node);
3777                 spin_unlock_bh(&conn->cmd_lock);
3778
3779                 iscsit_free_cmd(cmd, false);
3780                 break;
3781         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3782                 iscsit_mod_nopin_response_timer(conn);
3783                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3784                 if (ret < 0)
3785                         goto err;
3786                 break;
3787         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3788                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3789                 if (ret < 0)
3790                         goto err;
3791                 break;
3792         default:
3793                 pr_err("Unknown Opcode: 0x%02x ITT:"
3794                        " 0x%08x, i_state: %d on CID: %hu\n",
3795                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3796                        conn->cid);
3797                 goto err;
3798         }
3799
3800         return 0;
3801
3802 err:
3803         return -1;
3804 }
3805
3806 static int
3807 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3808 {
3809         struct iscsit_transport *t = conn->conn_transport;
3810         struct iscsi_queue_req *qr;
3811         struct iscsi_cmd *cmd;
3812         u8 state;
3813         int ret;
3814
3815         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3816                 atomic_set(&conn->check_immediate_queue, 0);
3817                 cmd = qr->cmd;
3818                 state = qr->state;
3819                 kmem_cache_free(lio_qr_cache, qr);
3820
3821                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3822                 if (ret < 0)
3823                         return ret;
3824         }
3825
3826         return 0;
3827 }
3828
3829 static int
3830 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3831 {
3832         int ret;
3833
3834 check_rsp_state:
3835         switch (state) {
3836         case ISTATE_SEND_DATAIN:
3837                 ret = iscsit_send_datain(cmd, conn);
3838                 if (ret < 0)
3839                         goto err;
3840                 else if (!ret)
3841                         /* more drs */
3842                         goto check_rsp_state;
3843                 else if (ret == 1) {
3844                         /* all done */
3845                         spin_lock_bh(&cmd->istate_lock);
3846                         cmd->i_state = ISTATE_SENT_STATUS;
3847                         spin_unlock_bh(&cmd->istate_lock);
3848
3849                         if (atomic_read(&conn->check_immediate_queue))
3850                                 return 1;
3851
3852                         return 0;
3853                 } else if (ret == 2) {
3854                         /* Still must send status,
3855                            SCF_TRANSPORT_TASK_SENSE was set */
3856                         spin_lock_bh(&cmd->istate_lock);
3857                         cmd->i_state = ISTATE_SEND_STATUS;
3858                         spin_unlock_bh(&cmd->istate_lock);
3859                         state = ISTATE_SEND_STATUS;
3860                         goto check_rsp_state;
3861                 }
3862
3863                 break;
3864         case ISTATE_SEND_STATUS:
3865         case ISTATE_SEND_STATUS_RECOVERY:
3866                 ret = iscsit_send_response(cmd, conn);
3867                 break;
3868         case ISTATE_SEND_LOGOUTRSP:
3869                 ret = iscsit_send_logout(cmd, conn);
3870                 break;
3871         case ISTATE_SEND_ASYNCMSG:
3872                 ret = iscsit_send_conn_drop_async_message(
3873                         cmd, conn);
3874                 break;
3875         case ISTATE_SEND_NOPIN:
3876                 ret = iscsit_send_nopin(cmd, conn);
3877                 break;
3878         case ISTATE_SEND_REJECT:
3879                 ret = iscsit_send_reject(cmd, conn);
3880                 break;
3881         case ISTATE_SEND_TASKMGTRSP:
3882                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3883                 if (ret != 0)
3884                         break;
3885                 ret = iscsit_tmr_post_handler(cmd, conn);
3886                 if (ret != 0)
3887                         iscsit_fall_back_to_erl0(conn->sess);
3888                 break;
3889         case ISTATE_SEND_TEXTRSP:
3890                 ret = iscsit_send_text_rsp(cmd, conn);
3891                 break;
3892         default:
3893                 pr_err("Unknown Opcode: 0x%02x ITT:"
3894                        " 0x%08x, i_state: %d on CID: %hu\n",
3895                        cmd->iscsi_opcode, cmd->init_task_tag,
3896                        state, conn->cid);
3897                 goto err;
3898         }
3899         if (ret < 0)
3900                 goto err;
3901
3902         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3903                 iscsit_tx_thread_wait_for_tcp(conn);
3904                 iscsit_unmap_iovec(cmd);
3905                 goto err;
3906         }
3907         iscsit_unmap_iovec(cmd);
3908
3909         switch (state) {
3910         case ISTATE_SEND_LOGOUTRSP:
3911                 if (!iscsit_logout_post_handler(cmd, conn))
3912                         return -ECONNRESET;
3913                 /* fall through */
3914         case ISTATE_SEND_STATUS:
3915         case ISTATE_SEND_ASYNCMSG:
3916         case ISTATE_SEND_NOPIN:
3917         case ISTATE_SEND_STATUS_RECOVERY:
3918         case ISTATE_SEND_TEXTRSP:
3919         case ISTATE_SEND_TASKMGTRSP:
3920         case ISTATE_SEND_REJECT:
3921                 spin_lock_bh(&cmd->istate_lock);
3922                 cmd->i_state = ISTATE_SENT_STATUS;
3923                 spin_unlock_bh(&cmd->istate_lock);
3924                 break;
3925         default:
3926                 pr_err("Unknown Opcode: 0x%02x ITT:"
3927                        " 0x%08x, i_state: %d on CID: %hu\n",
3928                        cmd->iscsi_opcode, cmd->init_task_tag,
3929                        cmd->i_state, conn->cid);
3930                 goto err;
3931         }
3932
3933         if (atomic_read(&conn->check_immediate_queue))
3934                 return 1;
3935
3936         return 0;
3937
3938 err:
3939         return -1;
3940 }
3941
3942 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3943 {
3944         struct iscsit_transport *t = conn->conn_transport;
3945         struct iscsi_queue_req *qr;
3946         struct iscsi_cmd *cmd;
3947         u8 state;
3948         int ret;
3949
3950         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3951                 cmd = qr->cmd;
3952                 state = qr->state;
3953                 kmem_cache_free(lio_qr_cache, qr);
3954
3955                 ret = t->iscsit_response_queue(conn, cmd, state);
3956                 if (ret == 1 || ret < 0)
3957                         return ret;
3958         }
3959
3960         return 0;
3961 }
3962
3963 int iscsi_target_tx_thread(void *arg)
3964 {
3965         int ret = 0;
3966         struct iscsi_conn *conn = arg;
3967         /*
3968          * Allow ourselves to be interrupted by SIGINT so that a
3969          * connection recovery / failure event can be triggered externally.
3970          */
3971         allow_signal(SIGINT);
3972
3973         while (!kthread_should_stop()) {
3974                 /*
3975                  * Ensure that both TX and RX per connection kthreads
3976                  * are scheduled to run on the same CPU.
3977                  */
3978                 iscsit_thread_check_cpumask(conn, current, 1);
3979
3980                 wait_event_interruptible(conn->queues_wq,
3981                                          !iscsit_conn_all_queues_empty(conn));
3982
3983                 if (signal_pending(current))
3984                         goto transport_err;
3985
3986 get_immediate:
3987                 ret = iscsit_handle_immediate_queue(conn);
3988                 if (ret < 0)
3989                         goto transport_err;
3990
3991                 ret = iscsit_handle_response_queue(conn);
3992                 if (ret == 1)
3993                         goto get_immediate;
3994                 else if (ret == -ECONNRESET)
3995                         goto out;
3996                 else if (ret < 0)
3997                         goto transport_err;
3998         }
3999
4000 transport_err:
4001         iscsit_take_action_for_connection_exit(conn);
4002 out:
4003         return 0;
4004 }
4005
4006 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4007 {
4008         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4009         struct iscsi_cmd *cmd;
4010         int ret = 0;
4011
4012         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4013         case ISCSI_OP_SCSI_CMD:
4014                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4015                 if (!cmd)
4016                         goto reject;
4017
4018                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4019                 break;
4020         case ISCSI_OP_SCSI_DATA_OUT:
4021                 ret = iscsit_handle_data_out(conn, buf);
4022                 break;
4023         case ISCSI_OP_NOOP_OUT:
4024                 cmd = NULL;
4025                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4026                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4027                         if (!cmd)
4028                                 goto reject;
4029                 }
4030                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4031                 break;
4032         case ISCSI_OP_SCSI_TMFUNC:
4033                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4034                 if (!cmd)
4035                         goto reject;
4036
4037                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4038                 break;
4039         case ISCSI_OP_TEXT:
4040                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4041                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4042                         if (!cmd)
4043                                 goto reject;
4044                 } else {
4045                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4046                         if (!cmd)
4047                                 goto reject;
4048                 }
4049
4050                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4051                 break;
4052         case ISCSI_OP_LOGOUT:
4053                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4054                 if (!cmd)
4055                         goto reject;
4056
4057                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4058                 if (ret > 0)
4059                         wait_for_completion_timeout(&conn->conn_logout_comp,
4060                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4061                 break;
4062         case ISCSI_OP_SNACK:
4063                 ret = iscsit_handle_snack(conn, buf);
4064                 break;
4065         default:
4066                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4067                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4068                         pr_err("Cannot recover from unknown"
4069                         " opcode while ERL=0, closing iSCSI connection.\n");
4070                         return -1;
4071                 }
4072                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4073                        " closing iSCSI connection.\n");
4074                 ret = -1;
4075                 break;
4076         }
4077
4078         return ret;
4079 reject:
4080         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4081 }
4082
4083 int iscsi_target_rx_thread(void *arg)
4084 {
4085         int ret;
4086         u8 buffer[ISCSI_HDR_LEN], opcode;
4087         u32 checksum = 0, digest = 0;
4088         struct iscsi_conn *conn = arg;
4089         struct kvec iov;
4090         /*
4091          * Allow ourselves to be interrupted by SIGINT so that a
4092          * connection recovery / failure event can be triggered externally.
4093          */
4094         allow_signal(SIGINT);
4095
4096         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4097                 struct completion comp;
4098                 int rc;
4099
4100                 init_completion(&comp);
4101                 rc = wait_for_completion_interruptible(&comp);
4102                 if (rc < 0)
4103                         goto transport_err;
4104
4105                 goto transport_err;
4106         }
4107
4108         while (!kthread_should_stop()) {
4109                 /*
4110                  * Ensure that both TX and RX per connection kthreads
4111                  * are scheduled to run on the same CPU.
4112                  */
4113                 iscsit_thread_check_cpumask(conn, current, 0);
4114
4115                 memset(buffer, 0, ISCSI_HDR_LEN);
4116                 memset(&iov, 0, sizeof(struct kvec));
4117
4118                 iov.iov_base    = buffer;
4119                 iov.iov_len     = ISCSI_HDR_LEN;
4120
4121                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4122                 if (ret != ISCSI_HDR_LEN) {
4123                         iscsit_rx_thread_wait_for_tcp(conn);
4124                         goto transport_err;
4125                 }
4126
4127                 if (conn->conn_ops->HeaderDigest) {
4128                         iov.iov_base    = &digest;
4129                         iov.iov_len     = ISCSI_CRC_LEN;
4130
4131                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4132                         if (ret != ISCSI_CRC_LEN) {
4133                                 iscsit_rx_thread_wait_for_tcp(conn);
4134                                 goto transport_err;
4135                         }
4136
4137                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4138                                         buffer, ISCSI_HDR_LEN,
4139                                         0, NULL, (u8 *)&checksum);
4140
4141                         if (digest != checksum) {
4142                                 pr_err("HeaderDigest CRC32C failed,"
4143                                         " received 0x%08x, computed 0x%08x\n",
4144                                         digest, checksum);
4145                                 /*
4146                                  * Set the PDU to 0xff so it will intentionally
4147                                  * hit default in the switch below.
4148                                  */
4149                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4150                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4151                         } else {
4152                                 pr_debug("Got HeaderDigest CRC32C"
4153                                                 " 0x%08x\n", checksum);
4154                         }
4155                 }
4156
4157                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4158                         goto transport_err;
4159
4160                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4161
4162                 if (conn->sess->sess_ops->SessionType &&
4163                    ((!(opcode & ISCSI_OP_TEXT)) ||
4164                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4165                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4166                         " while in Discovery Session, rejecting.\n", opcode);
4167                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4168                                           buffer);
4169                         goto transport_err;
4170                 }
4171
4172                 ret = iscsi_target_rx_opcode(conn, buffer);
4173                 if (ret < 0)
4174                         goto transport_err;
4175         }
4176
4177 transport_err:
4178         if (!signal_pending(current))
4179                 atomic_set(&conn->transport_failed, 1);
4180         iscsit_take_action_for_connection_exit(conn);
4181         return 0;
4182 }
4183
4184 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4185 {
4186         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4187         struct iscsi_session *sess = conn->sess;
4188         /*
4189          * We expect this function to only ever be called from either RX or TX
4190          * thread context via iscsit_close_connection() once the other context
4191          * has been reset -> returned sleeping pre-handler state.
4192          */
4193         spin_lock_bh(&conn->cmd_lock);
4194         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4195
4196                 list_del_init(&cmd->i_conn_node);
4197                 spin_unlock_bh(&conn->cmd_lock);
4198
4199                 iscsit_increment_maxcmdsn(cmd, sess);
4200
4201                 iscsit_free_cmd(cmd, true);
4202
4203                 spin_lock_bh(&conn->cmd_lock);
4204         }
4205         spin_unlock_bh(&conn->cmd_lock);
4206 }
4207
4208 static void iscsit_stop_timers_for_cmds(
4209         struct iscsi_conn *conn)
4210 {
4211         struct iscsi_cmd *cmd;
4212
4213         spin_lock_bh(&conn->cmd_lock);
4214         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4215                 if (cmd->data_direction == DMA_TO_DEVICE)
4216                         iscsit_stop_dataout_timer(cmd);
4217         }
4218         spin_unlock_bh(&conn->cmd_lock);
4219 }
4220
4221 int iscsit_close_connection(
4222         struct iscsi_conn *conn)
4223 {
4224         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4225         struct iscsi_session    *sess = conn->sess;
4226
4227         pr_debug("Closing iSCSI connection CID %hu on SID:"
4228                 " %u\n", conn->cid, sess->sid);
4229         /*
4230          * Always up conn_logout_comp for the traditional TCP case just in case
4231          * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4232          * response never got sent because the connection failed.
4233          *
4234          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4235          * to signal logout response TX interrupt completion.  Go ahead and skip
4236          * this for iser since isert_rx_opcode() does not wait on logout failure,
4237          * and to avoid iscsi_conn pointer dereference in iser-target code.
4238          */
4239         if (conn->conn_transport->transport_type == ISCSI_TCP)
4240                 complete(&conn->conn_logout_comp);
4241
4242         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4243                 if (conn->tx_thread &&
4244                     cmpxchg(&conn->tx_thread_active, true, false)) {
4245                         send_sig(SIGINT, conn->tx_thread, 1);
4246                         kthread_stop(conn->tx_thread);
4247                 }
4248         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4249                 if (conn->rx_thread &&
4250                     cmpxchg(&conn->rx_thread_active, true, false)) {
4251                         send_sig(SIGINT, conn->rx_thread, 1);
4252                         kthread_stop(conn->rx_thread);
4253                 }
4254         }
4255
4256         spin_lock(&iscsit_global->ts_bitmap_lock);
4257         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4258                               get_order(1));
4259         spin_unlock(&iscsit_global->ts_bitmap_lock);
4260
4261         iscsit_stop_timers_for_cmds(conn);
4262         iscsit_stop_nopin_response_timer(conn);
4263         iscsit_stop_nopin_timer(conn);
4264
4265         if (conn->conn_transport->iscsit_wait_conn)
4266                 conn->conn_transport->iscsit_wait_conn(conn);
4267
4268         /*
4269          * During Connection recovery drop unacknowledged out of order
4270          * commands for this connection, and prepare the other commands
4271          * for realligence.
4272          *
4273          * During normal operation clear the out of order commands (but
4274          * do not free the struct iscsi_ooo_cmdsn's) and release all
4275          * struct iscsi_cmds.
4276          */
4277         if (atomic_read(&conn->connection_recovery)) {
4278                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4279                 iscsit_prepare_cmds_for_realligance(conn);
4280         } else {
4281                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4282                 iscsit_release_commands_from_conn(conn);
4283         }
4284         iscsit_free_queue_reqs_for_conn(conn);
4285
4286         /*
4287          * Handle decrementing session or connection usage count if
4288          * a logout response was not able to be sent because the
4289          * connection failed.  Fall back to Session Recovery here.
4290          */
4291         if (atomic_read(&conn->conn_logout_remove)) {
4292                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4293                         iscsit_dec_conn_usage_count(conn);
4294                         iscsit_dec_session_usage_count(sess);
4295                 }
4296                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4297                         iscsit_dec_conn_usage_count(conn);
4298
4299                 atomic_set(&conn->conn_logout_remove, 0);
4300                 atomic_set(&sess->session_reinstatement, 0);
4301                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4302         }
4303
4304         spin_lock_bh(&sess->conn_lock);
4305         list_del(&conn->conn_list);
4306
4307         /*
4308          * Attempt to let the Initiator know this connection failed by
4309          * sending an Connection Dropped Async Message on another
4310          * active connection.
4311          */
4312         if (atomic_read(&conn->connection_recovery))
4313                 iscsit_build_conn_drop_async_message(conn);
4314
4315         spin_unlock_bh(&sess->conn_lock);
4316
4317         /*
4318          * If connection reinstatement is being performed on this connection,
4319          * up the connection reinstatement semaphore that is being blocked on
4320          * in iscsit_cause_connection_reinstatement().
4321          */
4322         spin_lock_bh(&conn->state_lock);
4323         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4324                 spin_unlock_bh(&conn->state_lock);
4325                 complete(&conn->conn_wait_comp);
4326                 wait_for_completion(&conn->conn_post_wait_comp);
4327                 spin_lock_bh(&conn->state_lock);
4328         }
4329
4330         /*
4331          * If connection reinstatement is being performed on this connection
4332          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4333          * connection wait rcfr semaphore that is being blocked on
4334          * an iscsit_connection_reinstatement_rcfr().
4335          */
4336         if (atomic_read(&conn->connection_wait_rcfr)) {
4337                 spin_unlock_bh(&conn->state_lock);
4338                 complete(&conn->conn_wait_rcfr_comp);
4339                 wait_for_completion(&conn->conn_post_wait_comp);
4340                 spin_lock_bh(&conn->state_lock);
4341         }
4342         atomic_set(&conn->connection_reinstatement, 1);
4343         spin_unlock_bh(&conn->state_lock);
4344
4345         /*
4346          * If any other processes are accessing this connection pointer we
4347          * must wait until they have completed.
4348          */
4349         iscsit_check_conn_usage_count(conn);
4350
4351         if (conn->conn_rx_hash.tfm)
4352                 crypto_free_hash(conn->conn_rx_hash.tfm);
4353         if (conn->conn_tx_hash.tfm)
4354                 crypto_free_hash(conn->conn_tx_hash.tfm);
4355
4356         free_cpumask_var(conn->conn_cpumask);
4357
4358         kfree(conn->conn_ops);
4359         conn->conn_ops = NULL;
4360
4361         if (conn->sock)
4362                 sock_release(conn->sock);
4363
4364         if (conn->conn_transport->iscsit_free_conn)
4365                 conn->conn_transport->iscsit_free_conn(conn);
4366
4367         iscsit_put_transport(conn->conn_transport);
4368
4369         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4370         conn->conn_state = TARG_CONN_STATE_FREE;
4371         kfree(conn);
4372
4373         spin_lock_bh(&sess->conn_lock);
4374         atomic_dec(&sess->nconn);
4375         pr_debug("Decremented iSCSI connection count to %hu from node:"
4376                 " %s\n", atomic_read(&sess->nconn),
4377                 sess->sess_ops->InitiatorName);
4378         /*
4379          * Make sure that if one connection fails in an non ERL=2 iSCSI
4380          * Session that they all fail.
4381          */
4382         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4383              !atomic_read(&sess->session_logout))
4384                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4385
4386         /*
4387          * If this was not the last connection in the session, and we are
4388          * performing session reinstatement or falling back to ERL=0, call
4389          * iscsit_stop_session() without sleeping to shutdown the other
4390          * active connections.
4391          */
4392         if (atomic_read(&sess->nconn)) {
4393                 if (!atomic_read(&sess->session_reinstatement) &&
4394                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4395                         spin_unlock_bh(&sess->conn_lock);
4396                         return 0;
4397                 }
4398                 if (!atomic_read(&sess->session_stop_active)) {
4399                         atomic_set(&sess->session_stop_active, 1);
4400                         spin_unlock_bh(&sess->conn_lock);
4401                         iscsit_stop_session(sess, 0, 0);
4402                         return 0;
4403                 }
4404                 spin_unlock_bh(&sess->conn_lock);
4405                 return 0;
4406         }
4407
4408         /*
4409          * If this was the last connection in the session and one of the
4410          * following is occurring:
4411          *
4412          * Session Reinstatement is not being performed, and are falling back
4413          * to ERL=0 call iscsit_close_session().
4414          *
4415          * Session Logout was requested.  iscsit_close_session() will be called
4416          * elsewhere.
4417          *
4418          * Session Continuation is not being performed, start the Time2Retain
4419          * handler and check if sleep_on_sess_wait_sem is active.
4420          */
4421         if (!atomic_read(&sess->session_reinstatement) &&
4422              atomic_read(&sess->session_fall_back_to_erl0)) {
4423                 spin_unlock_bh(&sess->conn_lock);
4424                 target_put_session(sess->se_sess);
4425
4426                 return 0;
4427         } else if (atomic_read(&sess->session_logout)) {
4428                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4429                 sess->session_state = TARG_SESS_STATE_FREE;
4430                 spin_unlock_bh(&sess->conn_lock);
4431
4432                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4433                         complete(&sess->session_wait_comp);
4434
4435                 return 0;
4436         } else {
4437                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4438                 sess->session_state = TARG_SESS_STATE_FAILED;
4439
4440                 if (!atomic_read(&sess->session_continuation)) {
4441                         spin_unlock_bh(&sess->conn_lock);
4442                         iscsit_start_time2retain_handler(sess);
4443                 } else
4444                         spin_unlock_bh(&sess->conn_lock);
4445
4446                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4447                         complete(&sess->session_wait_comp);
4448
4449                 return 0;
4450         }
4451         spin_unlock_bh(&sess->conn_lock);
4452
4453         return 0;
4454 }
4455
4456 int iscsit_close_session(struct iscsi_session *sess)
4457 {
4458         struct iscsi_portal_group *tpg = sess->tpg;
4459         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4460
4461         if (atomic_read(&sess->nconn)) {
4462                 pr_err("%d connection(s) still exist for iSCSI session"
4463                         " to %s\n", atomic_read(&sess->nconn),
4464                         sess->sess_ops->InitiatorName);
4465                 BUG();
4466         }
4467
4468         spin_lock_bh(&se_tpg->session_lock);
4469         atomic_set(&sess->session_logout, 1);
4470         atomic_set(&sess->session_reinstatement, 1);
4471         iscsit_stop_time2retain_timer(sess);
4472         spin_unlock_bh(&se_tpg->session_lock);
4473
4474         /*
4475          * transport_deregister_session_configfs() will clear the
4476          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4477          * can be setting it again with __transport_register_session() in
4478          * iscsi_post_login_handler() again after the iscsit_stop_session()
4479          * completes in iscsi_np context.
4480          */
4481         transport_deregister_session_configfs(sess->se_sess);
4482
4483         /*
4484          * If any other processes are accessing this session pointer we must
4485          * wait until they have completed.  If we are in an interrupt (the
4486          * time2retain handler) and contain and active session usage count we
4487          * restart the timer and exit.
4488          */
4489         if (!in_interrupt()) {
4490                 if (iscsit_check_session_usage_count(sess) == 1)
4491                         iscsit_stop_session(sess, 1, 1);
4492         } else {
4493                 if (iscsit_check_session_usage_count(sess) == 2) {
4494                         atomic_set(&sess->session_logout, 0);
4495                         iscsit_start_time2retain_handler(sess);
4496                         return 0;
4497                 }
4498         }
4499
4500         transport_deregister_session(sess->se_sess);
4501
4502         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4503                 iscsit_free_connection_recovery_entires(sess);
4504
4505         iscsit_free_all_ooo_cmdsns(sess);
4506
4507         spin_lock_bh(&se_tpg->session_lock);
4508         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4509         sess->session_state = TARG_SESS_STATE_FREE;
4510         pr_debug("Released iSCSI session from node: %s\n",
4511                         sess->sess_ops->InitiatorName);
4512         tpg->nsessions--;
4513         if (tpg->tpg_tiqn)
4514                 tpg->tpg_tiqn->tiqn_nsessions--;
4515
4516         pr_debug("Decremented number of active iSCSI Sessions on"
4517                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4518
4519         spin_lock(&sess_idr_lock);
4520         idr_remove(&sess_idr, sess->session_index);
4521         spin_unlock(&sess_idr_lock);
4522
4523         kfree(sess->sess_ops);
4524         sess->sess_ops = NULL;
4525         spin_unlock_bh(&se_tpg->session_lock);
4526
4527         kfree(sess);
4528         return 0;
4529 }
4530
4531 static void iscsit_logout_post_handler_closesession(
4532         struct iscsi_conn *conn)
4533 {
4534         struct iscsi_session *sess = conn->sess;
4535         int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4536
4537         atomic_set(&conn->conn_logout_remove, 0);
4538         complete(&conn->conn_logout_comp);
4539
4540         iscsit_dec_conn_usage_count(conn);
4541         iscsit_stop_session(sess, sleep, sleep);
4542         iscsit_dec_session_usage_count(sess);
4543         target_put_session(sess->se_sess);
4544 }
4545
4546 static void iscsit_logout_post_handler_samecid(
4547         struct iscsi_conn *conn)
4548 {
4549         int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4550
4551         atomic_set(&conn->conn_logout_remove, 0);
4552         complete(&conn->conn_logout_comp);
4553
4554         iscsit_cause_connection_reinstatement(conn, sleep);
4555         iscsit_dec_conn_usage_count(conn);
4556 }
4557
4558 static void iscsit_logout_post_handler_diffcid(
4559         struct iscsi_conn *conn,
4560         u16 cid)
4561 {
4562         struct iscsi_conn *l_conn;
4563         struct iscsi_session *sess = conn->sess;
4564         bool conn_found = false;
4565
4566         if (!sess)
4567                 return;
4568
4569         spin_lock_bh(&sess->conn_lock);
4570         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4571                 if (l_conn->cid == cid) {
4572                         iscsit_inc_conn_usage_count(l_conn);
4573                         conn_found = true;
4574                         break;
4575                 }
4576         }
4577         spin_unlock_bh(&sess->conn_lock);
4578
4579         if (!conn_found)
4580                 return;
4581
4582         if (l_conn->sock)
4583                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4584
4585         spin_lock_bh(&l_conn->state_lock);
4586         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4587         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4588         spin_unlock_bh(&l_conn->state_lock);
4589
4590         iscsit_cause_connection_reinstatement(l_conn, 1);
4591         iscsit_dec_conn_usage_count(l_conn);
4592 }
4593
4594 /*
4595  *      Return of 0 causes the TX thread to restart.
4596  */
4597 int iscsit_logout_post_handler(
4598         struct iscsi_cmd *cmd,
4599         struct iscsi_conn *conn)
4600 {
4601         int ret = 0;
4602
4603         switch (cmd->logout_reason) {
4604         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4605                 switch (cmd->logout_response) {
4606                 case ISCSI_LOGOUT_SUCCESS:
4607                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4608                 default:
4609                         iscsit_logout_post_handler_closesession(conn);
4610                         break;
4611                 }
4612                 ret = 0;
4613                 break;
4614         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4615                 if (conn->cid == cmd->logout_cid) {
4616                         switch (cmd->logout_response) {
4617                         case ISCSI_LOGOUT_SUCCESS:
4618                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4619                         default:
4620                                 iscsit_logout_post_handler_samecid(conn);
4621                                 break;
4622                         }
4623                         ret = 0;
4624                 } else {
4625                         switch (cmd->logout_response) {
4626                         case ISCSI_LOGOUT_SUCCESS:
4627                                 iscsit_logout_post_handler_diffcid(conn,
4628                                         cmd->logout_cid);
4629                                 break;
4630                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4631                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4632                         default:
4633                                 break;
4634                         }
4635                         ret = 1;
4636                 }
4637                 break;
4638         case ISCSI_LOGOUT_REASON_RECOVERY:
4639                 switch (cmd->logout_response) {
4640                 case ISCSI_LOGOUT_SUCCESS:
4641                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4642                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4643                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4644                 default:
4645                         break;
4646                 }
4647                 ret = 1;
4648                 break;
4649         default:
4650                 break;
4651
4652         }
4653         return ret;
4654 }
4655 EXPORT_SYMBOL(iscsit_logout_post_handler);
4656
4657 void iscsit_fail_session(struct iscsi_session *sess)
4658 {
4659         struct iscsi_conn *conn;
4660
4661         spin_lock_bh(&sess->conn_lock);
4662         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4663                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4664                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4665         }
4666         spin_unlock_bh(&sess->conn_lock);
4667
4668         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4669         sess->session_state = TARG_SESS_STATE_FAILED;
4670 }
4671
4672 int iscsit_free_session(struct iscsi_session *sess)
4673 {
4674         u16 conn_count = atomic_read(&sess->nconn);
4675         struct iscsi_conn *conn, *conn_tmp = NULL;
4676         int is_last;
4677
4678         spin_lock_bh(&sess->conn_lock);
4679         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4680
4681         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4682                         conn_list) {
4683                 if (conn_count == 0)
4684                         break;
4685
4686                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4687                         is_last = 1;
4688                 } else {
4689                         iscsit_inc_conn_usage_count(conn_tmp);
4690                         is_last = 0;
4691                 }
4692                 iscsit_inc_conn_usage_count(conn);
4693
4694                 spin_unlock_bh(&sess->conn_lock);
4695                 iscsit_cause_connection_reinstatement(conn, 1);
4696                 spin_lock_bh(&sess->conn_lock);
4697
4698                 iscsit_dec_conn_usage_count(conn);
4699                 if (is_last == 0)
4700                         iscsit_dec_conn_usage_count(conn_tmp);
4701
4702                 conn_count--;
4703         }
4704
4705         if (atomic_read(&sess->nconn)) {
4706                 spin_unlock_bh(&sess->conn_lock);
4707                 wait_for_completion(&sess->session_wait_comp);
4708         } else
4709                 spin_unlock_bh(&sess->conn_lock);
4710
4711         target_put_session(sess->se_sess);
4712         return 0;
4713 }
4714
4715 void iscsit_stop_session(
4716         struct iscsi_session *sess,
4717         int session_sleep,
4718         int connection_sleep)
4719 {
4720         u16 conn_count = atomic_read(&sess->nconn);
4721         struct iscsi_conn *conn, *conn_tmp = NULL;
4722         int is_last;
4723
4724         spin_lock_bh(&sess->conn_lock);
4725         if (session_sleep)
4726                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4727
4728         if (connection_sleep) {
4729                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4730                                 conn_list) {
4731                         if (conn_count == 0)
4732                                 break;
4733
4734                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4735                                 is_last = 1;
4736                         } else {
4737                                 iscsit_inc_conn_usage_count(conn_tmp);
4738                                 is_last = 0;
4739                         }
4740                         iscsit_inc_conn_usage_count(conn);
4741
4742                         spin_unlock_bh(&sess->conn_lock);
4743                         iscsit_cause_connection_reinstatement(conn, 1);
4744                         spin_lock_bh(&sess->conn_lock);
4745
4746                         iscsit_dec_conn_usage_count(conn);
4747                         if (is_last == 0)
4748                                 iscsit_dec_conn_usage_count(conn_tmp);
4749                         conn_count--;
4750                 }
4751         } else {
4752                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4753                         iscsit_cause_connection_reinstatement(conn, 0);
4754         }
4755
4756         if (session_sleep && atomic_read(&sess->nconn)) {
4757                 spin_unlock_bh(&sess->conn_lock);
4758                 wait_for_completion(&sess->session_wait_comp);
4759         } else
4760                 spin_unlock_bh(&sess->conn_lock);
4761 }
4762
4763 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4764 {
4765         struct iscsi_session *sess;
4766         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4767         struct se_session *se_sess, *se_sess_tmp;
4768         int session_count = 0;
4769
4770         spin_lock_bh(&se_tpg->session_lock);
4771         if (tpg->nsessions && !force) {
4772                 spin_unlock_bh(&se_tpg->session_lock);
4773                 return -1;
4774         }
4775
4776         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4777                         sess_list) {
4778                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4779
4780                 spin_lock(&sess->conn_lock);
4781                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4782                     atomic_read(&sess->session_logout) ||
4783                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4784                         spin_unlock(&sess->conn_lock);
4785                         continue;
4786                 }
4787                 atomic_set(&sess->session_reinstatement, 1);
4788                 spin_unlock(&sess->conn_lock);
4789                 spin_unlock_bh(&se_tpg->session_lock);
4790
4791                 iscsit_free_session(sess);
4792                 spin_lock_bh(&se_tpg->session_lock);
4793
4794                 session_count++;
4795         }
4796         spin_unlock_bh(&se_tpg->session_lock);
4797
4798         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4799                         " Group: %hu\n", session_count, tpg->tpgt);
4800         return 0;
4801 }
4802
4803 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4804 MODULE_VERSION("4.1.x");
4805 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4806 MODULE_LICENSE("GPL");
4807
4808 module_init(iscsi_target_init_module);
4809 module_exit(iscsi_target_cleanup_module);