drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31 #include <target/target_core_configfs.h>
  32
  33 #include <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) || signal_pending(current))
 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(conn->sess->se_sess, &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(conn->sess->se_sess, &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         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1012         if (cmd->sense_reason) {
1013                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1014                         return iscsit_add_reject_cmd(cmd,
1015                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1016                 }
1017
1018                 goto attach_cmd;
1019         }
1020
1021         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1022                 return iscsit_add_reject_cmd(cmd,
1023                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1024         }
1025
1026 attach_cmd:
1027         spin_lock_bh(&conn->cmd_lock);
1028         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1029         spin_unlock_bh(&conn->cmd_lock);
1030         /*
1031          * Check if we need to delay processing because of ALUA
1032          * Active/NonOptimized primary access state..
1033          */
1034         core_alua_check_nonop_delay(&cmd->se_cmd);
1035
1036         return 0;
1037 }
1038 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1039
1040 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1041 {
1042         iscsit_set_dataout_sequence_values(cmd);
1043
1044         spin_lock_bh(&cmd->dataout_timeout_lock);
1045         iscsit_start_dataout_timer(cmd, cmd->conn);
1046         spin_unlock_bh(&cmd->dataout_timeout_lock);
1047 }
1048 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1049
1050 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1051                             struct iscsi_scsi_req *hdr)
1052 {
1053         int cmdsn_ret = 0;
1054         /*
1055          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1056          * the Immediate Bit is not set, and no Immediate
1057          * Data is attached.
1058          *
1059          * A PDU/CmdSN carrying Immediate Data can only
1060          * be processed after the DataCRC has passed.
1061          * If the DataCRC fails, the CmdSN MUST NOT
1062          * be acknowledged. (See below)
1063          */
1064         if (!cmd->immediate_data) {
1065                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1066                                         (unsigned char *)hdr, hdr->cmdsn);
1067                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1068                         return -1;
1069                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1070                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1071                         return 0;
1072                 }
1073         }
1074
1075         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1076
1077         /*
1078          * If no Immediate Data is attached, it's OK to return now.
1079          */
1080         if (!cmd->immediate_data) {
1081                 if (!cmd->sense_reason && cmd->unsolicited_data)
1082                         iscsit_set_unsoliticed_dataout(cmd);
1083                 if (!cmd->sense_reason)
1084                         return 0;
1085
1086                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1087                 return 0;
1088         }
1089
1090         /*
1091          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1092          * execution.  These exceptions are processed in CmdSN order using
1093          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1094          */
1095         if (cmd->sense_reason) {
1096                 if (cmd->reject_reason)
1097                         return 0;
1098
1099                 return 1;
1100         }
1101         /*
1102          * Call directly into transport_generic_new_cmd() to perform
1103          * the backend memory allocation.
1104          */
1105         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1106         if (cmd->sense_reason)
1107                 return 1;
1108
1109         return 0;
1110 }
1111 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1112
1113 static int
1114 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1115                           bool dump_payload)
1116 {
1117         struct iscsi_conn *conn = cmd->conn;
1118         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1119         /*
1120          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1121          */
1122         if (dump_payload)
1123                 goto after_immediate_data;
1124
1125         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1126                                         cmd->first_burst_len);
1127 after_immediate_data:
1128         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1129                 /*
1130                  * A PDU/CmdSN carrying Immediate Data passed
1131                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1132                  * Immediate Bit is not set.
1133                  */
1134                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1135                                         (unsigned char *)hdr, hdr->cmdsn);
1136                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1137                         return -1;
1138
1139                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1140                         int rc;
1141
1142                         rc = iscsit_dump_data_payload(cmd->conn,
1143                                                       cmd->first_burst_len, 1);
1144                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1145                         return rc;
1146                 } else if (cmd->unsolicited_data)
1147                         iscsit_set_unsoliticed_dataout(cmd);
1148
1149         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1150                 /*
1151                  * Immediate Data failed DataCRC and ERL>=1,
1152                  * silently drop this PDU and let the initiator
1153                  * plug the CmdSN gap.
1154                  *
1155                  * FIXME: Send Unsolicited NOPIN with reserved
1156                  * TTT here to help the initiator figure out
1157                  * the missing CmdSN, although they should be
1158                  * intelligent enough to determine the missing
1159                  * CmdSN and issue a retry to plug the sequence.
1160                  */
1161                 cmd->i_state = ISTATE_REMOVE;
1162                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1163         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1164                 return -1;
1165
1166         return 0;
1167 }
1168
1169 static int
1170 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1171                            unsigned char *buf)
1172 {
1173         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1174         int rc, immed_data;
1175         bool dump_payload = false;
1176
1177         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1178         if (rc < 0)
1179                 return 0;
1180         /*
1181          * Allocation iovecs needed for struct socket operations for
1182          * traditional iSCSI block I/O.
1183          */
1184         if (iscsit_allocate_iovecs(cmd) < 0) {
1185                 return iscsit_add_reject_cmd(cmd,
1186                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1187         }
1188         immed_data = cmd->immediate_data;
1189
1190         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1191         if (rc < 0)
1192                 return rc;
1193         else if (rc > 0)
1194                 dump_payload = true;
1195
1196         if (!immed_data)
1197                 return 0;
1198
1199         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1200 }
1201
1202 static u32 iscsit_do_crypto_hash_sg(
1203         struct hash_desc *hash,
1204         struct iscsi_cmd *cmd,
1205         u32 data_offset,
1206         u32 data_length,
1207         u32 padding,
1208         u8 *pad_bytes)
1209 {
1210         u32 data_crc;
1211         u32 i;
1212         struct scatterlist *sg;
1213         unsigned int page_off;
1214
1215         crypto_hash_init(hash);
1216
1217         sg = cmd->first_data_sg;
1218         page_off = cmd->first_data_sg_off;
1219
1220         i = 0;
1221         while (data_length) {
1222                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1223
1224                 crypto_hash_update(hash, &sg[i], cur_len);
1225
1226                 data_length -= cur_len;
1227                 page_off = 0;
1228                 i++;
1229         }
1230
1231         if (padding) {
1232                 struct scatterlist pad_sg;
1233
1234                 sg_init_one(&pad_sg, pad_bytes, padding);
1235                 crypto_hash_update(hash, &pad_sg, padding);
1236         }
1237         crypto_hash_final(hash, (u8 *) &data_crc);
1238
1239         return data_crc;
1240 }
1241
1242 static void iscsit_do_crypto_hash_buf(
1243         struct hash_desc *hash,
1244         const void *buf,
1245         u32 payload_length,
1246         u32 padding,
1247         u8 *pad_bytes,
1248         u8 *data_crc)
1249 {
1250         struct scatterlist sg;
1251
1252         crypto_hash_init(hash);
1253
1254         sg_init_one(&sg, buf, payload_length);
1255         crypto_hash_update(hash, &sg, payload_length);
1256
1257         if (padding) {
1258                 sg_init_one(&sg, pad_bytes, padding);
1259                 crypto_hash_update(hash, &sg, padding);
1260         }
1261         crypto_hash_final(hash, data_crc);
1262 }
1263
1264 int
1265 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1266                           struct iscsi_cmd **out_cmd)
1267 {
1268         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1269         struct iscsi_cmd *cmd = NULL;
1270         struct se_cmd *se_cmd;
1271         u32 payload_length = ntoh24(hdr->dlength);
1272         int rc;
1273
1274         if (!payload_length) {
1275                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1276                 return 0;
1277         }
1278
1279         /* iSCSI write */
1280         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1281
1282         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1283                 pr_err("DataSegmentLength: %u is greater than"
1284                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1285                         conn->conn_ops->MaxXmitDataSegmentLength);
1286                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1287                                          buf);
1288         }
1289
1290         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1291                         payload_length);
1292         if (!cmd)
1293                 return 0;
1294
1295         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1296                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1297                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1298                 payload_length, conn->cid);
1299
1300         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1301                 pr_err("Command ITT: 0x%08x received DataOUT after"
1302                         " last DataOUT received, dumping payload\n",
1303                         cmd->init_task_tag);
1304                 return iscsit_dump_data_payload(conn, payload_length, 1);
1305         }
1306
1307         if (cmd->data_direction != DMA_TO_DEVICE) {
1308                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1309                         " NON-WRITE command.\n", cmd->init_task_tag);
1310                 return iscsit_dump_data_payload(conn, payload_length, 1);
1311         }
1312         se_cmd = &cmd->se_cmd;
1313         iscsit_mod_dataout_timer(cmd);
1314
1315         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1316                 pr_err("DataOut Offset: %u, Length %u greater than"
1317                         " iSCSI Command EDTL %u, protocol error.\n",
1318                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1319                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1320         }
1321
1322         if (cmd->unsolicited_data) {
1323                 int dump_unsolicited_data = 0;
1324
1325                 if (conn->sess->sess_ops->InitialR2T) {
1326                         pr_err("Received unexpected unsolicited data"
1327                                 " while InitialR2T=Yes, protocol error.\n");
1328                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1329                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1330                         return -1;
1331                 }
1332                 /*
1333                  * Special case for dealing with Unsolicited DataOUT
1334                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1335                  * failures;
1336                  */
1337
1338                 /* Something's amiss if we're not in WRITE_PENDING state... */
1339                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1340                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1341                         dump_unsolicited_data = 1;
1342
1343                 if (dump_unsolicited_data) {
1344                         /*
1345                          * Check if a delayed TASK_ABORTED status needs to
1346                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1347                          * received with the unsolicitied data out.
1348                          */
1349                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1350                                 iscsit_stop_dataout_timer(cmd);
1351
1352                         transport_check_aborted_status(se_cmd,
1353                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1354                         return iscsit_dump_data_payload(conn, payload_length, 1);
1355                 }
1356         } else {
1357                 /*
1358                  * For the normal solicited data path:
1359                  *
1360                  * Check for a delayed TASK_ABORTED status and dump any
1361                  * incoming data out payload if one exists.  Also, when the
1362                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1363                  * data out sequence, we decrement outstanding_r2ts.  Once
1364                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1365                  * TASK_ABORTED status.
1366                  */
1367                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1368                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1369                                 if (--cmd->outstanding_r2ts < 1) {
1370                                         iscsit_stop_dataout_timer(cmd);
1371                                         transport_check_aborted_status(
1372                                                         se_cmd, 1);
1373                                 }
1374
1375                         return iscsit_dump_data_payload(conn, payload_length, 1);
1376                 }
1377         }
1378         /*
1379          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1380          * within-command recovery checks before receiving the payload.
1381          */
1382         rc = iscsit_check_pre_dataout(cmd, buf);
1383         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1384                 return 0;
1385         else if (rc == DATAOUT_CANNOT_RECOVER)
1386                 return -1;
1387
1388         *out_cmd = cmd;
1389         return 0;
1390 }
1391 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1392
1393 static int
1394 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1395                    struct iscsi_data *hdr)
1396 {
1397         struct kvec *iov;
1398         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1399         u32 payload_length = ntoh24(hdr->dlength);
1400         int iov_ret, data_crc_failed = 0;
1401
1402         rx_size += payload_length;
1403         iov = &cmd->iov_data[0];
1404
1405         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1406                                    payload_length);
1407         if (iov_ret < 0)
1408                 return -1;
1409
1410         iov_count += iov_ret;
1411
1412         padding = ((-payload_length) & 3);
1413         if (padding != 0) {
1414                 iov[iov_count].iov_base = cmd->pad_bytes;
1415                 iov[iov_count++].iov_len = padding;
1416                 rx_size += padding;
1417                 pr_debug("Receiving %u padding bytes.\n", padding);
1418         }
1419
1420         if (conn->conn_ops->DataDigest) {
1421                 iov[iov_count].iov_base = &checksum;
1422                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1423                 rx_size += ISCSI_CRC_LEN;
1424         }
1425
1426         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1427
1428         iscsit_unmap_iovec(cmd);
1429
1430         if (rx_got != rx_size)
1431                 return -1;
1432
1433         if (conn->conn_ops->DataDigest) {
1434                 u32 data_crc;
1435
1436                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1437                                                     be32_to_cpu(hdr->offset),
1438                                                     payload_length, padding,
1439                                                     cmd->pad_bytes);
1440
1441                 if (checksum != data_crc) {
1442                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1443                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1444                                 " does not match computed 0x%08x\n",
1445                                 hdr->itt, hdr->offset, payload_length,
1446                                 hdr->datasn, checksum, data_crc);
1447                         data_crc_failed = 1;
1448                 } else {
1449                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1450                                 " %u bytes of Data Out\n", checksum,
1451                                 payload_length);
1452                 }
1453         }
1454
1455         return data_crc_failed;
1456 }
1457
1458 int
1459 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1460                              bool data_crc_failed)
1461 {
1462         struct iscsi_conn *conn = cmd->conn;
1463         int rc, ooo_cmdsn;
1464         /*
1465          * Increment post receive data and CRC values or perform
1466          * within-command recovery.
1467          */
1468         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1469         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1470                 return 0;
1471         else if (rc == DATAOUT_SEND_R2T) {
1472                 iscsit_set_dataout_sequence_values(cmd);
1473                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1474         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1475                 /*
1476                  * Handle extra special case for out of order
1477                  * Unsolicited Data Out.
1478                  */
1479                 spin_lock_bh(&cmd->istate_lock);
1480                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1481                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1482                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1483                 spin_unlock_bh(&cmd->istate_lock);
1484
1485                 iscsit_stop_dataout_timer(cmd);
1486                 if (ooo_cmdsn)
1487                         return 0;
1488                 target_execute_cmd(&cmd->se_cmd);
1489                 return 0;
1490         } else /* DATAOUT_CANNOT_RECOVER */
1491                 return -1;
1492
1493         return 0;
1494 }
1495 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1496
1497 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1498 {
1499         struct iscsi_cmd *cmd = NULL;
1500         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1501         int rc;
1502         bool data_crc_failed = false;
1503
1504         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1505         if (rc < 0)
1506                 return 0;
1507         else if (!cmd)
1508                 return 0;
1509
1510         rc = iscsit_get_dataout(conn, cmd, hdr);
1511         if (rc < 0)
1512                 return rc;
1513         else if (rc > 0)
1514                 data_crc_failed = true;
1515
1516         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1517 }
1518
1519 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1520                          struct iscsi_nopout *hdr)
1521 {
1522         u32 payload_length = ntoh24(hdr->dlength);
1523
1524         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1525                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1526                 if (!cmd)
1527                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1528                                                  (unsigned char *)hdr);
1529
1530                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1531                                          (unsigned char *)hdr);
1532         }
1533
1534         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1535                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1536                         " not set, protocol error.\n");
1537                 if (!cmd)
1538                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1539                                                  (unsigned char *)hdr);
1540
1541                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1542                                          (unsigned char *)hdr);
1543         }
1544
1545         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1546                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1547                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1548                         " error.\n", payload_length,
1549                         conn->conn_ops->MaxXmitDataSegmentLength);
1550                 if (!cmd)
1551                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1552                                                  (unsigned char *)hdr);
1553
1554                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1555                                          (unsigned char *)hdr);
1556         }
1557
1558         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1559                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1560                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1561                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1562                 payload_length);
1563         /*
1564          * This is not a response to a Unsolicited NopIN, which means
1565          * it can either be a NOPOUT ping request (with a valid ITT),
1566          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1567          * Either way, make sure we allocate an struct iscsi_cmd, as both
1568          * can contain ping data.
1569          */
1570         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1571                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1572                 cmd->i_state            = ISTATE_SEND_NOPIN;
1573                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1574                                                 1 : 0);
1575                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1576                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1577                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1578                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1579                 cmd->data_direction     = DMA_NONE;
1580         }
1581
1582         return 0;
1583 }
1584 EXPORT_SYMBOL(iscsit_setup_nop_out);
1585
1586 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1587                            struct iscsi_nopout *hdr)
1588 {
1589         struct iscsi_cmd *cmd_p = NULL;
1590         int cmdsn_ret = 0;
1591         /*
1592          * Initiator is expecting a NopIN ping reply..
1593          */
1594         if (hdr->itt != RESERVED_ITT) {
1595                 if (!cmd)
1596                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1597                                                 (unsigned char *)hdr);
1598
1599                 spin_lock_bh(&conn->cmd_lock);
1600                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1601                 spin_unlock_bh(&conn->cmd_lock);
1602
1603                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1604
1605                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1606                         iscsit_add_cmd_to_response_queue(cmd, conn,
1607                                                          cmd->i_state);
1608                         return 0;
1609                 }
1610
1611                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1612                                 (unsigned char *)hdr, hdr->cmdsn);
1613                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1614                         return 0;
1615                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1616                         return -1;
1617
1618                 return 0;
1619         }
1620         /*
1621          * This was a response to a unsolicited NOPIN ping.
1622          */
1623         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1624                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1625                 if (!cmd_p)
1626                         return -EINVAL;
1627
1628                 iscsit_stop_nopin_response_timer(conn);
1629
1630                 cmd_p->i_state = ISTATE_REMOVE;
1631                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1632
1633                 iscsit_start_nopin_timer(conn);
1634                 return 0;
1635         }
1636         /*
1637          * Otherwise, initiator is not expecting a NOPIN is response.
1638          * Just ignore for now.
1639          */
1640         return 0;
1641 }
1642 EXPORT_SYMBOL(iscsit_process_nop_out);
1643
1644 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1645                                  unsigned char *buf)
1646 {
1647         unsigned char *ping_data = NULL;
1648         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1649         struct kvec *iov = NULL;
1650         u32 payload_length = ntoh24(hdr->dlength);
1651         int ret;
1652
1653         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1654         if (ret < 0)
1655                 return 0;
1656         /*
1657          * Handle NOP-OUT payload for traditional iSCSI sockets
1658          */
1659         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1660                 u32 checksum, data_crc, padding = 0;
1661                 int niov = 0, rx_got, rx_size = payload_length;
1662
1663                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1664                 if (!ping_data) {
1665                         pr_err("Unable to allocate memory for"
1666                                 " NOPOUT ping data.\n");
1667                         ret = -1;
1668                         goto out;
1669                 }
1670
1671                 iov = &cmd->iov_misc[0];
1672                 iov[niov].iov_base      = ping_data;
1673                 iov[niov++].iov_len     = payload_length;
1674
1675                 padding = ((-payload_length) & 3);
1676                 if (padding != 0) {
1677                         pr_debug("Receiving %u additional bytes"
1678                                 " for padding.\n", padding);
1679                         iov[niov].iov_base      = &cmd->pad_bytes;
1680                         iov[niov++].iov_len     = padding;
1681                         rx_size += padding;
1682                 }
1683                 if (conn->conn_ops->DataDigest) {
1684                         iov[niov].iov_base      = &checksum;
1685                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1686                         rx_size += ISCSI_CRC_LEN;
1687                 }
1688
1689                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1690                 if (rx_got != rx_size) {
1691                         ret = -1;
1692                         goto out;
1693                 }
1694
1695                 if (conn->conn_ops->DataDigest) {
1696                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1697                                         ping_data, payload_length,
1698                                         padding, cmd->pad_bytes,
1699                                         (u8 *)&data_crc);
1700
1701                         if (checksum != data_crc) {
1702                                 pr_err("Ping data CRC32C DataDigest"
1703                                 " 0x%08x does not match computed 0x%08x\n",
1704                                         checksum, data_crc);
1705                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1706                                         pr_err("Unable to recover from"
1707                                         " NOPOUT Ping DataCRC failure while in"
1708                                                 " ERL=0.\n");
1709                                         ret = -1;
1710                                         goto out;
1711                                 } else {
1712                                         /*
1713                                          * Silently drop this PDU and let the
1714                                          * initiator plug the CmdSN gap.
1715                                          */
1716                                         pr_debug("Dropping NOPOUT"
1717                                         " Command CmdSN: 0x%08x due to"
1718                                         " DataCRC error.\n", hdr->cmdsn);
1719                                         ret = 0;
1720                                         goto out;
1721                                 }
1722                         } else {
1723                                 pr_debug("Got CRC32C DataDigest"
1724                                 " 0x%08x for %u bytes of ping data.\n",
1725                                         checksum, payload_length);
1726                         }
1727                 }
1728
1729                 ping_data[payload_length] = '\0';
1730                 /*
1731                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1732                  */
1733                 cmd->buf_ptr = ping_data;
1734                 cmd->buf_ptr_size = payload_length;
1735
1736                 pr_debug("Got %u bytes of NOPOUT ping"
1737                         " data.\n", payload_length);
1738                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1739         }
1740
1741         return iscsit_process_nop_out(conn, cmd, hdr);
1742 out:
1743         if (cmd)
1744                 iscsit_free_cmd(cmd, false);
1745
1746         kfree(ping_data);
1747         return ret;
1748 }
1749
1750 int
1751 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1752                            unsigned char *buf)
1753 {
1754         struct se_tmr_req *se_tmr;
1755         struct iscsi_tmr_req *tmr_req;
1756         struct iscsi_tm *hdr;
1757         int out_of_order_cmdsn = 0, ret;
1758         bool sess_ref = false;
1759         u8 function;
1760
1761         hdr                     = (struct iscsi_tm *) buf;
1762         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1763         function = hdr->flags;
1764
1765         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1766                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1767                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1768                 hdr->rtt, hdr->refcmdsn, conn->cid);
1769
1770         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1771             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1772              hdr->rtt != RESERVED_ITT)) {
1773                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1774                 hdr->rtt = RESERVED_ITT;
1775         }
1776
1777         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1778                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1779                 pr_err("Task Management Request TASK_REASSIGN not"
1780                         " issued as immediate command, bad iSCSI Initiator"
1781                                 "implementation\n");
1782                 return iscsit_add_reject_cmd(cmd,
1783                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1784         }
1785         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1786             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1787                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1788
1789         cmd->data_direction = DMA_NONE;
1790
1791         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1792         if (!cmd->tmr_req) {
1793                 pr_err("Unable to allocate memory for"
1794                         " Task Management command!\n");
1795                 return iscsit_add_reject_cmd(cmd,
1796                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1797                                              buf);
1798         }
1799
1800         /*
1801          * TASK_REASSIGN for ERL=2 / connection stays inside of
1802          * LIO-Target $FABRIC_MOD
1803          */
1804         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1805
1806                 u8 tcm_function;
1807                 int ret;
1808
1809                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1810                                       conn->sess->se_sess, 0, DMA_NONE,
1811                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1812
1813                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1814                 sess_ref = true;
1815
1816                 switch (function) {
1817                 case ISCSI_TM_FUNC_ABORT_TASK:
1818                         tcm_function = TMR_ABORT_TASK;
1819                         break;
1820                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1821                         tcm_function = TMR_ABORT_TASK_SET;
1822                         break;
1823                 case ISCSI_TM_FUNC_CLEAR_ACA:
1824                         tcm_function = TMR_CLEAR_ACA;
1825                         break;
1826                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1827                         tcm_function = TMR_CLEAR_TASK_SET;
1828                         break;
1829                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1830                         tcm_function = TMR_LUN_RESET;
1831                         break;
1832                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1833                         tcm_function = TMR_TARGET_WARM_RESET;
1834                         break;
1835                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1836                         tcm_function = TMR_TARGET_COLD_RESET;
1837                         break;
1838                 default:
1839                         pr_err("Unknown iSCSI TMR Function:"
1840                                " 0x%02x\n", function);
1841                         return iscsit_add_reject_cmd(cmd,
1842                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1843                 }
1844
1845                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846                                          tcm_function, GFP_KERNEL);
1847                 if (ret < 0)
1848                         return iscsit_add_reject_cmd(cmd,
1849                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1850
1851                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1852         }
1853
1854         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1855         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1856         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1857         cmd->init_task_tag      = hdr->itt;
1858         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1859         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1860         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1861         se_tmr                  = cmd->se_cmd.se_tmr_req;
1862         tmr_req                 = cmd->tmr_req;
1863         /*
1864          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1865          */
1866         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1867                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1868                                                scsilun_to_int(&hdr->lun));
1869                 if (ret < 0) {
1870                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1871                         goto attach;
1872                 }
1873         }
1874
1875         switch (function) {
1876         case ISCSI_TM_FUNC_ABORT_TASK:
1877                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1878                 if (se_tmr->response)
1879                         goto attach;
1880                 break;
1881         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1882         case ISCSI_TM_FUNC_CLEAR_ACA:
1883         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1884         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1885                 break;
1886         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1887                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1888                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1889                         goto attach;
1890                 }
1891                 break;
1892         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1893                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1894                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1895                         goto attach;
1896                 }
1897                 break;
1898         case ISCSI_TM_FUNC_TASK_REASSIGN:
1899                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1900                 /*
1901                  * Perform sanity checks on the ExpDataSN only if the
1902                  * TASK_REASSIGN was successful.
1903                  */
1904                 if (se_tmr->response)
1905                         break;
1906
1907                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1908                         return iscsit_add_reject_cmd(cmd,
1909                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1910                 break;
1911         default:
1912                 pr_err("Unknown TMR function: 0x%02x, protocol"
1913                         " error.\n", function);
1914                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1915                 goto attach;
1916         }
1917
1918         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1919             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1920                 se_tmr->call_transport = 1;
1921 attach:
1922         spin_lock_bh(&conn->cmd_lock);
1923         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1924         spin_unlock_bh(&conn->cmd_lock);
1925
1926         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1927                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1928                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1929                         out_of_order_cmdsn = 1;
1930                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1931                         return 0;
1932                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1933                         return -1;
1934         }
1935         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1936
1937         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1938                 return 0;
1939         /*
1940          * Found the referenced task, send to transport for processing.
1941          */
1942         if (se_tmr->call_transport)
1943                 return transport_generic_handle_tmr(&cmd->se_cmd);
1944
1945         /*
1946          * Could not find the referenced LUN, task, or Task Management
1947          * command not authorized or supported.  Change state and
1948          * let the tx_thread send the response.
1949          *
1950          * For connection recovery, this is also the default action for
1951          * TMR TASK_REASSIGN.
1952          */
1953         if (sess_ref) {
1954                 pr_debug("Handle TMR, using sess_ref=true check\n");
1955                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1956         }
1957
1958         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1959         return 0;
1960 }
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1962
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1964 int
1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966                       struct iscsi_text *hdr)
1967 {
1968         u32 payload_length = ntoh24(hdr->dlength);
1969
1970         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1971                 pr_err("Unable to accept text parameter length: %u"
1972                         "greater than MaxXmitDataSegmentLength %u.\n",
1973                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1974                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1975                                          (unsigned char *)hdr);
1976         }
1977
1978         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1979              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1980                 pr_err("Multi sequence text commands currently not supported\n");
1981                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1982                                         (unsigned char *)hdr);
1983         }
1984
1985         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1987                 hdr->exp_statsn, payload_length);
1988
1989         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1990         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1991         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1992         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1993         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1994         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1995         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1996         cmd->data_direction     = DMA_NONE;
1997         cmd->text_in_ptr        = NULL;
1998
1999         return 0;
2000 }
2001 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2002
2003 int
2004 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2005                         struct iscsi_text *hdr)
2006 {
2007         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2008         int cmdsn_ret;
2009
2010         if (!text_in) {
2011                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2012                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2013                         pr_err("Unable to locate text_in buffer for sendtargets"
2014                                " discovery\n");
2015                         goto reject;
2016                 }
2017                 goto empty_sendtargets;
2018         }
2019         if (strncmp("SendTargets", text_in, 11) != 0) {
2020                 pr_err("Received Text Data that is not"
2021                         " SendTargets, cannot continue.\n");
2022                 goto reject;
2023         }
2024         text_ptr = strchr(text_in, '=');
2025         if (!text_ptr) {
2026                 pr_err("No \"=\" separator found in Text Data,"
2027                         "  cannot continue.\n");
2028                 goto reject;
2029         }
2030         if (!strncmp("=All", text_ptr, 4)) {
2031                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2032         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2033                    !strncmp("=eui.", text_ptr, 5)) {
2034                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2035         } else {
2036                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2037                 goto reject;
2038         }
2039
2040         spin_lock_bh(&conn->cmd_lock);
2041         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2042         spin_unlock_bh(&conn->cmd_lock);
2043
2044 empty_sendtargets:
2045         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2046
2047         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2048                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2049                                 (unsigned char *)hdr, hdr->cmdsn);
2050                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2051                         return -1;
2052
2053                 return 0;
2054         }
2055
2056         return iscsit_execute_cmd(cmd, 0);
2057
2058 reject:
2059         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2060                                  (unsigned char *)hdr);
2061 }
2062 EXPORT_SYMBOL(iscsit_process_text_cmd);
2063
2064 static int
2065 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2066                        unsigned char *buf)
2067 {
2068         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2069         char *text_in = NULL;
2070         u32 payload_length = ntoh24(hdr->dlength);
2071         int rx_size, rc;
2072
2073         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2074         if (rc < 0)
2075                 return 0;
2076
2077         rx_size = payload_length;
2078         if (payload_length) {
2079                 u32 checksum = 0, data_crc = 0;
2080                 u32 padding = 0, pad_bytes = 0;
2081                 int niov = 0, rx_got;
2082                 struct kvec iov[3];
2083
2084                 text_in = kzalloc(payload_length, GFP_KERNEL);
2085                 if (!text_in) {
2086                         pr_err("Unable to allocate memory for"
2087                                 " incoming text parameters\n");
2088                         goto reject;
2089                 }
2090                 cmd->text_in_ptr = text_in;
2091
2092                 memset(iov, 0, 3 * sizeof(struct kvec));
2093                 iov[niov].iov_base      = text_in;
2094                 iov[niov++].iov_len     = payload_length;
2095
2096                 padding = ((-payload_length) & 3);
2097                 if (padding != 0) {
2098                         iov[niov].iov_base = &pad_bytes;
2099                         iov[niov++].iov_len  = padding;
2100                         rx_size += padding;
2101                         pr_debug("Receiving %u additional bytes"
2102                                         " for padding.\n", padding);
2103                 }
2104                 if (conn->conn_ops->DataDigest) {
2105                         iov[niov].iov_base      = &checksum;
2106                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2107                         rx_size += ISCSI_CRC_LEN;
2108                 }
2109
2110                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2111                 if (rx_got != rx_size)
2112                         goto reject;
2113
2114                 if (conn->conn_ops->DataDigest) {
2115                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2116                                         text_in, payload_length,
2117                                         padding, (u8 *)&pad_bytes,
2118                                         (u8 *)&data_crc);
2119
2120                         if (checksum != data_crc) {
2121                                 pr_err("Text data CRC32C DataDigest"
2122                                         " 0x%08x does not match computed"
2123                                         " 0x%08x\n", checksum, data_crc);
2124                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2125                                         pr_err("Unable to recover from"
2126                                         " Text Data digest failure while in"
2127                                                 " ERL=0.\n");
2128                                         goto reject;
2129                                 } else {
2130                                         /*
2131                                          * Silently drop this PDU and let the
2132                                          * initiator plug the CmdSN gap.
2133                                          */
2134                                         pr_debug("Dropping Text"
2135                                         " Command CmdSN: 0x%08x due to"
2136                                         " DataCRC error.\n", hdr->cmdsn);
2137                                         kfree(text_in);
2138                                         return 0;
2139                                 }
2140                         } else {
2141                                 pr_debug("Got CRC32C DataDigest"
2142                                         " 0x%08x for %u bytes of text data.\n",
2143                                                 checksum, payload_length);
2144                         }
2145                 }
2146                 text_in[payload_length - 1] = '\0';
2147                 pr_debug("Successfully read %d bytes of text"
2148                                 " data.\n", payload_length);
2149         }
2150
2151         return iscsit_process_text_cmd(conn, cmd, hdr);
2152
2153 reject:
2154         kfree(cmd->text_in_ptr);
2155         cmd->text_in_ptr = NULL;
2156         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2157 }
2158
2159 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2160 {
2161         struct iscsi_conn *conn_p;
2162         struct iscsi_session *sess = conn->sess;
2163
2164         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2165                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2166
2167         atomic_set(&sess->session_logout, 1);
2168         atomic_set(&conn->conn_logout_remove, 1);
2169         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2170
2171         iscsit_inc_conn_usage_count(conn);
2172         iscsit_inc_session_usage_count(sess);
2173
2174         spin_lock_bh(&sess->conn_lock);
2175         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2176                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2177                         continue;
2178
2179                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2180                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2181         }
2182         spin_unlock_bh(&sess->conn_lock);
2183
2184         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2185
2186         return 0;
2187 }
2188
2189 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2190 {
2191         struct iscsi_conn *l_conn;
2192         struct iscsi_session *sess = conn->sess;
2193
2194         pr_debug("Received logout request CLOSECONNECTION for CID:"
2195                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2196
2197         /*
2198          * A Logout Request with a CLOSECONNECTION reason code for a CID
2199          * can arrive on a connection with a differing CID.
2200          */
2201         if (conn->cid == cmd->logout_cid) {
2202                 spin_lock_bh(&conn->state_lock);
2203                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2204                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2205
2206                 atomic_set(&conn->conn_logout_remove, 1);
2207                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2208                 iscsit_inc_conn_usage_count(conn);
2209
2210                 spin_unlock_bh(&conn->state_lock);
2211         } else {
2212                 /*
2213                  * Handle all different cid CLOSECONNECTION requests in
2214                  * iscsit_logout_post_handler_diffcid() as to give enough
2215                  * time for any non immediate command's CmdSN to be
2216                  * acknowledged on the connection in question.
2217                  *
2218                  * Here we simply make sure the CID is still around.
2219                  */
2220                 l_conn = iscsit_get_conn_from_cid(sess,
2221                                 cmd->logout_cid);
2222                 if (!l_conn) {
2223                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2224                         iscsit_add_cmd_to_response_queue(cmd, conn,
2225                                         cmd->i_state);
2226                         return 0;
2227                 }
2228
2229                 iscsit_dec_conn_usage_count(l_conn);
2230         }
2231
2232         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2233
2234         return 0;
2235 }
2236
2237 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2238 {
2239         struct iscsi_session *sess = conn->sess;
2240
2241         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2242                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2243
2244         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2245                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2246                         " while ERL!=2.\n");
2247                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2248                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2249                 return 0;
2250         }
2251
2252         if (conn->cid == cmd->logout_cid) {
2253                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2254                         " with CID: %hu on CID: %hu, implementation error.\n",
2255                                 cmd->logout_cid, conn->cid);
2256                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2257                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2258                 return 0;
2259         }
2260
2261         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2262
2263         return 0;
2264 }
2265
2266 int
2267 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2268                         unsigned char *buf)
2269 {
2270         int cmdsn_ret, logout_remove = 0;
2271         u8 reason_code = 0;
2272         struct iscsi_logout *hdr;
2273         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2274
2275         hdr                     = (struct iscsi_logout *) buf;
2276         reason_code             = (hdr->flags & 0x7f);
2277
2278         if (tiqn) {
2279                 spin_lock(&tiqn->logout_stats.lock);
2280                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2281                         tiqn->logout_stats.normal_logouts++;
2282                 else
2283                         tiqn->logout_stats.abnormal_logouts++;
2284                 spin_unlock(&tiqn->logout_stats.lock);
2285         }
2286
2287         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2288                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2289                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2290                 hdr->cid, conn->cid);
2291
2292         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2293                 pr_err("Received logout request on connection that"
2294                         " is not in logged in state, ignoring request.\n");
2295                 iscsit_free_cmd(cmd, false);
2296                 return 0;
2297         }
2298
2299         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2300         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2301         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2302         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2303         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2304         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2305         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2306         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2307         cmd->logout_reason      = reason_code;
2308         cmd->data_direction     = DMA_NONE;
2309
2310         /*
2311          * We need to sleep in these cases (by returning 1) until the Logout
2312          * Response gets sent in the tx thread.
2313          */
2314         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2315            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2316             be16_to_cpu(hdr->cid) == conn->cid))
2317                 logout_remove = 1;
2318
2319         spin_lock_bh(&conn->cmd_lock);
2320         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2321         spin_unlock_bh(&conn->cmd_lock);
2322
2323         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2324                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2325
2326         /*
2327          * Immediate commands are executed, well, immediately.
2328          * Non-Immediate Logout Commands are executed in CmdSN order.
2329          */
2330         if (cmd->immediate_cmd) {
2331                 int ret = iscsit_execute_cmd(cmd, 0);
2332
2333                 if (ret < 0)
2334                         return ret;
2335         } else {
2336                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2337                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2338                         logout_remove = 0;
2339                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2340                         return -1;
2341         }
2342
2343         return logout_remove;
2344 }
2345 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2346
2347 static int iscsit_handle_snack(
2348         struct iscsi_conn *conn,
2349         unsigned char *buf)
2350 {
2351         struct iscsi_snack *hdr;
2352
2353         hdr                     = (struct iscsi_snack *) buf;
2354         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2355
2356         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2357                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2358                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2359                         hdr->begrun, hdr->runlength, conn->cid);
2360
2361         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2362                 pr_err("Initiator sent SNACK request while in"
2363                         " ErrorRecoveryLevel=0.\n");
2364                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2365                                          buf);
2366         }
2367         /*
2368          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2369          * call from inside iscsi_send_recovery_datain_or_r2t().
2370          */
2371         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2372         case 0:
2373                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2374                         hdr->itt,
2375                         be32_to_cpu(hdr->ttt),
2376                         be32_to_cpu(hdr->begrun),
2377                         be32_to_cpu(hdr->runlength));
2378         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2379                 return iscsit_handle_status_snack(conn, hdr->itt,
2380                         be32_to_cpu(hdr->ttt),
2381                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2382         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2383                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2384                         be32_to_cpu(hdr->begrun),
2385                         be32_to_cpu(hdr->runlength));
2386         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2387                 /* FIXME: Support R-Data SNACK */
2388                 pr_err("R-Data SNACK Not Supported.\n");
2389                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2390                                          buf);
2391         default:
2392                 pr_err("Unknown SNACK type 0x%02x, protocol"
2393                         " error.\n", hdr->flags & 0x0f);
2394                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2395                                          buf);
2396         }
2397
2398         return 0;
2399 }
2400
2401 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2402 {
2403         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2404             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2405                 wait_for_completion_interruptible_timeout(
2406                                         &conn->rx_half_close_comp,
2407                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2408         }
2409 }
2410
2411 static int iscsit_handle_immediate_data(
2412         struct iscsi_cmd *cmd,
2413         struct iscsi_scsi_req *hdr,
2414         u32 length)
2415 {
2416         int iov_ret, rx_got = 0, rx_size = 0;
2417         u32 checksum, iov_count = 0, padding = 0;
2418         struct iscsi_conn *conn = cmd->conn;
2419         struct kvec *iov;
2420
2421         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2422         if (iov_ret < 0)
2423                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2424
2425         rx_size = length;
2426         iov_count = iov_ret;
2427         iov = &cmd->iov_data[0];
2428
2429         padding = ((-length) & 3);
2430         if (padding != 0) {
2431                 iov[iov_count].iov_base = cmd->pad_bytes;
2432                 iov[iov_count++].iov_len = padding;
2433                 rx_size += padding;
2434         }
2435
2436         if (conn->conn_ops->DataDigest) {
2437                 iov[iov_count].iov_base         = &checksum;
2438                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2439                 rx_size += ISCSI_CRC_LEN;
2440         }
2441
2442         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2443
2444         iscsit_unmap_iovec(cmd);
2445
2446         if (rx_got != rx_size) {
2447                 iscsit_rx_thread_wait_for_tcp(conn);
2448                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2449         }
2450
2451         if (conn->conn_ops->DataDigest) {
2452                 u32 data_crc;
2453
2454                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2455                                                     cmd->write_data_done, length, padding,
2456                                                     cmd->pad_bytes);
2457
2458                 if (checksum != data_crc) {
2459                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2460                                 " does not match computed 0x%08x\n", checksum,
2461                                 data_crc);
2462
2463                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2464                                 pr_err("Unable to recover from"
2465                                         " Immediate Data digest failure while"
2466                                         " in ERL=0.\n");
2467                                 iscsit_reject_cmd(cmd,
2468                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2469                                                 (unsigned char *)hdr);
2470                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2471                         } else {
2472                                 iscsit_reject_cmd(cmd,
2473                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2474                                                 (unsigned char *)hdr);
2475                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2476                         }
2477                 } else {
2478                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2479                                 " %u bytes of Immediate Data\n", checksum,
2480                                 length);
2481                 }
2482         }
2483
2484         cmd->write_data_done += length;
2485
2486         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2487                 spin_lock_bh(&cmd->istate_lock);
2488                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2489                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2490                 spin_unlock_bh(&cmd->istate_lock);
2491         }
2492
2493         return IMMEDIATE_DATA_NORMAL_OPERATION;
2494 }
2495
2496 /*
2497  *      Called with sess->conn_lock held.
2498  */
2499 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2500         with active network interface */
2501 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2502 {
2503         struct iscsi_cmd *cmd;
2504         struct iscsi_conn *conn_p;
2505         bool found = false;
2506
2507         /*
2508          * Only send a Asynchronous Message on connections whos network
2509          * interface is still functional.
2510          */
2511         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2512                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2513                         iscsit_inc_conn_usage_count(conn_p);
2514                         found = true;
2515                         break;
2516                 }
2517         }
2518
2519         if (!found)
2520                 return;
2521
2522         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2523         if (!cmd) {
2524                 iscsit_dec_conn_usage_count(conn_p);
2525                 return;
2526         }
2527
2528         cmd->logout_cid = conn->cid;
2529         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2530         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2531
2532         spin_lock_bh(&conn_p->cmd_lock);
2533         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2534         spin_unlock_bh(&conn_p->cmd_lock);
2535
2536         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2537         iscsit_dec_conn_usage_count(conn_p);
2538 }
2539
2540 static int iscsit_send_conn_drop_async_message(
2541         struct iscsi_cmd *cmd,
2542         struct iscsi_conn *conn)
2543 {
2544         struct iscsi_async *hdr;
2545
2546         cmd->tx_size = ISCSI_HDR_LEN;
2547         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2548
2549         hdr                     = (struct iscsi_async *) cmd->pdu;
2550         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2551         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2552         cmd->init_task_tag      = RESERVED_ITT;
2553         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2554         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2555         cmd->stat_sn            = conn->stat_sn++;
2556         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2557         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2558         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2559         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2560         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2561         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2562         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2563
2564         if (conn->conn_ops->HeaderDigest) {
2565                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2566
2567                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2568                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2569
2570                 cmd->tx_size += ISCSI_CRC_LEN;
2571                 pr_debug("Attaching CRC32C HeaderDigest to"
2572                         " Async Message 0x%08x\n", *header_digest);
2573         }
2574
2575         cmd->iov_misc[0].iov_base       = cmd->pdu;
2576         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2577         cmd->iov_misc_count             = 1;
2578
2579         pr_debug("Sending Connection Dropped Async Message StatSN:"
2580                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2581                         cmd->logout_cid, conn->cid);
2582         return 0;
2583 }
2584
2585 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2586 {
2587         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2588             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2589                 wait_for_completion_interruptible_timeout(
2590                                         &conn->tx_half_close_comp,
2591                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2592         }
2593 }
2594
2595 static void
2596 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2597                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2598                         bool set_statsn)
2599 {
2600         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2601         hdr->flags              = datain->flags;
2602         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2603                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2604                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2605                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2606                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2607                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2608                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2609                 }
2610         }
2611         hton24(hdr->dlength, datain->length);
2612         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2613                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2614                                 (struct scsi_lun *)&hdr->lun);
2615         else
2616                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2617
2618         hdr->itt                = cmd->init_task_tag;
2619
2620         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2621                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2622         else
2623                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2624         if (set_statsn)
2625                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2626         else
2627                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2628
2629         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2630         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2631         hdr->datasn             = cpu_to_be32(datain->data_sn);
2632         hdr->offset             = cpu_to_be32(datain->offset);
2633
2634         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2635                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2636                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2637                 ntohl(hdr->offset), datain->length, conn->cid);
2638 }
2639
2640 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2641 {
2642         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2643         struct iscsi_datain datain;
2644         struct iscsi_datain_req *dr;
2645         struct kvec *iov;
2646         u32 iov_count = 0, tx_size = 0;
2647         int eodr = 0, ret, iov_ret;
2648         bool set_statsn = false;
2649
2650         memset(&datain, 0, sizeof(struct iscsi_datain));
2651         dr = iscsit_get_datain_values(cmd, &datain);
2652         if (!dr) {
2653                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2654                                 cmd->init_task_tag);
2655                 return -1;
2656         }
2657         /*
2658          * Be paranoid and double check the logic for now.
2659          */
2660         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2661                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2662                         " datain.length: %u exceeds cmd->data_length: %u\n",
2663                         cmd->init_task_tag, datain.offset, datain.length,
2664                         cmd->se_cmd.data_length);
2665                 return -1;
2666         }
2667
2668         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2669         /*
2670          * Special case for successfully execution w/ both DATAIN
2671          * and Sense Data.
2672          */
2673         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2674             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2675                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2676         else {
2677                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2678                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2679                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2680                         cmd->stat_sn = conn->stat_sn++;
2681                         set_statsn = true;
2682                 } else if (dr->dr_complete ==
2683                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2684                         set_statsn = true;
2685         }
2686
2687         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2688
2689         iov = &cmd->iov_data[0];
2690         iov[iov_count].iov_base = cmd->pdu;
2691         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2692         tx_size += ISCSI_HDR_LEN;
2693
2694         if (conn->conn_ops->HeaderDigest) {
2695                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2696
2697                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2698                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2699
2700                 iov[0].iov_len += ISCSI_CRC_LEN;
2701                 tx_size += ISCSI_CRC_LEN;
2702
2703                 pr_debug("Attaching CRC32 HeaderDigest"
2704                         " for DataIN PDU 0x%08x\n", *header_digest);
2705         }
2706
2707         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2708                                 datain.offset, datain.length);
2709         if (iov_ret < 0)
2710                 return -1;
2711
2712         iov_count += iov_ret;
2713         tx_size += datain.length;
2714
2715         cmd->padding = ((-datain.length) & 3);
2716         if (cmd->padding) {
2717                 iov[iov_count].iov_base         = cmd->pad_bytes;
2718                 iov[iov_count++].iov_len        = cmd->padding;
2719                 tx_size += cmd->padding;
2720
2721                 pr_debug("Attaching %u padding bytes\n",
2722                                 cmd->padding);
2723         }
2724         if (conn->conn_ops->DataDigest) {
2725                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2726                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2727
2728                 iov[iov_count].iov_base = &cmd->data_crc;
2729                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2730                 tx_size += ISCSI_CRC_LEN;
2731
2732                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2733                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2734         }
2735
2736         cmd->iov_data_count = iov_count;
2737         cmd->tx_size = tx_size;
2738
2739         /* sendpage is preferred but can't insert markers */
2740         if (!conn->conn_ops->IFMarker)
2741                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2742         else
2743                 ret = iscsit_send_tx_data(cmd, conn, 0);
2744
2745         iscsit_unmap_iovec(cmd);
2746
2747         if (ret < 0) {
2748                 iscsit_tx_thread_wait_for_tcp(conn);
2749                 return ret;
2750         }
2751
2752         if (dr->dr_complete) {
2753                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2754                                 2 : 1;
2755                 iscsit_free_datain_req(cmd, dr);
2756         }
2757
2758         return eodr;
2759 }
2760
2761 int
2762 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2763                         struct iscsi_logout_rsp *hdr)
2764 {
2765         struct iscsi_conn *logout_conn = NULL;
2766         struct iscsi_conn_recovery *cr = NULL;
2767         struct iscsi_session *sess = conn->sess;
2768         /*
2769          * The actual shutting down of Sessions and/or Connections
2770          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2771          * is done in scsi_logout_post_handler().
2772          */
2773         switch (cmd->logout_reason) {
2774         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2775                 pr_debug("iSCSI session logout successful, setting"
2776                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2777                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2778                 break;
2779         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2780                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2781                         break;
2782                 /*
2783                  * For CLOSECONNECTION logout requests carrying
2784                  * a matching logout CID -> local CID, the reference
2785                  * for the local CID will have been incremented in
2786                  * iscsi_logout_closeconnection().
2787                  *
2788                  * For CLOSECONNECTION logout requests carrying
2789                  * a different CID than the connection it arrived
2790                  * on, the connection responding to cmd->logout_cid
2791                  * is stopped in iscsit_logout_post_handler_diffcid().
2792                  */
2793
2794                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2795                         " successful.\n", cmd->logout_cid, conn->cid);
2796                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2797                 break;
2798         case ISCSI_LOGOUT_REASON_RECOVERY:
2799                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2800                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2801                         break;
2802                 /*
2803                  * If the connection is still active from our point of view
2804                  * force connection recovery to occur.
2805                  */
2806                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2807                                 cmd->logout_cid);
2808                 if (logout_conn) {
2809                         iscsit_connection_reinstatement_rcfr(logout_conn);
2810                         iscsit_dec_conn_usage_count(logout_conn);
2811                 }
2812
2813                 cr = iscsit_get_inactive_connection_recovery_entry(
2814                                 conn->sess, cmd->logout_cid);
2815                 if (!cr) {
2816                         pr_err("Unable to locate CID: %hu for"
2817                         " REMOVECONNFORRECOVERY Logout Request.\n",
2818                                 cmd->logout_cid);
2819                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2820                         break;
2821                 }
2822
2823                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2824
2825                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2826                         " for recovery for CID: %hu on CID: %hu successful.\n",
2827                                 cmd->logout_cid, conn->cid);
2828                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2829                 break;
2830         default:
2831                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2832                                 cmd->logout_reason);
2833                 return -1;
2834         }
2835
2836         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2837         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2838         hdr->response           = cmd->logout_response;
2839         hdr->itt                = cmd->init_task_tag;
2840         cmd->stat_sn            = conn->stat_sn++;
2841         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2842
2843         iscsit_increment_maxcmdsn(cmd, conn->sess);
2844         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2845         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2846
2847         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2848                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2849                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2850                 cmd->logout_cid, conn->cid);
2851
2852         return 0;
2853 }
2854 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2855
2856 static int
2857 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2858 {
2859         struct kvec *iov;
2860         int niov = 0, tx_size, rc;
2861
2862         rc = iscsit_build_logout_rsp(cmd, conn,
2863                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2864         if (rc < 0)
2865                 return rc;
2866
2867         tx_size = ISCSI_HDR_LEN;
2868         iov = &cmd->iov_misc[0];
2869         iov[niov].iov_base      = cmd->pdu;
2870         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2871
2872         if (conn->conn_ops->HeaderDigest) {
2873                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2874
2875                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2876                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2877
2878                 iov[0].iov_len += ISCSI_CRC_LEN;
2879                 tx_size += ISCSI_CRC_LEN;
2880                 pr_debug("Attaching CRC32C HeaderDigest to"
2881                         " Logout Response 0x%08x\n", *header_digest);
2882         }
2883         cmd->iov_misc_count = niov;
2884         cmd->tx_size = tx_size;
2885
2886         return 0;
2887 }
2888
2889 void
2890 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2891                        struct iscsi_nopin *hdr, bool nopout_response)
2892 {
2893         hdr->opcode             = ISCSI_OP_NOOP_IN;
2894         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2895         hton24(hdr->dlength, cmd->buf_ptr_size);
2896         if (nopout_response)
2897                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2898         hdr->itt                = cmd->init_task_tag;
2899         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2900         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2901                                   conn->stat_sn;
2902         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2903
2904         if (nopout_response)
2905                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2906
2907         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2908         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2909
2910         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2911                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2912                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2913                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2914 }
2915 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2916
2917 /*
2918  *      Unsolicited NOPIN, either requesting a response or not.
2919  */
2920 static int iscsit_send_unsolicited_nopin(
2921         struct iscsi_cmd *cmd,
2922         struct iscsi_conn *conn,
2923         int want_response)
2924 {
2925         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2926         int tx_size = ISCSI_HDR_LEN, ret;
2927
2928         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2929
2930         if (conn->conn_ops->HeaderDigest) {
2931                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2932
2933                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2934                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2935
2936                 tx_size += ISCSI_CRC_LEN;
2937                 pr_debug("Attaching CRC32C HeaderDigest to"
2938                         " NopIN 0x%08x\n", *header_digest);
2939         }
2940
2941         cmd->iov_misc[0].iov_base       = cmd->pdu;
2942         cmd->iov_misc[0].iov_len        = tx_size;
2943         cmd->iov_misc_count     = 1;
2944         cmd->tx_size            = tx_size;
2945
2946         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2947                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2948
2949         ret = iscsit_send_tx_data(cmd, conn, 1);
2950         if (ret < 0) {
2951                 iscsit_tx_thread_wait_for_tcp(conn);
2952                 return ret;
2953         }
2954
2955         spin_lock_bh(&cmd->istate_lock);
2956         cmd->i_state = want_response ?
2957                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2958         spin_unlock_bh(&cmd->istate_lock);
2959
2960         return 0;
2961 }
2962
2963 static int
2964 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2965 {
2966         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2967         struct kvec *iov;
2968         u32 padding = 0;
2969         int niov = 0, tx_size;
2970
2971         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2972
2973         tx_size = ISCSI_HDR_LEN;
2974         iov = &cmd->iov_misc[0];
2975         iov[niov].iov_base      = cmd->pdu;
2976         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2977
2978         if (conn->conn_ops->HeaderDigest) {
2979                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2980
2981                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2982                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2983
2984                 iov[0].iov_len += ISCSI_CRC_LEN;
2985                 tx_size += ISCSI_CRC_LEN;
2986                 pr_debug("Attaching CRC32C HeaderDigest"
2987                         " to NopIn 0x%08x\n", *header_digest);
2988         }
2989
2990         /*
2991          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2992          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2993          */
2994         if (cmd->buf_ptr_size) {
2995                 iov[niov].iov_base      = cmd->buf_ptr;
2996                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2997                 tx_size += cmd->buf_ptr_size;
2998
2999                 pr_debug("Echoing back %u bytes of ping"
3000                         " data.\n", cmd->buf_ptr_size);
3001
3002                 padding = ((-cmd->buf_ptr_size) & 3);
3003                 if (padding != 0) {
3004                         iov[niov].iov_base = &cmd->pad_bytes;
3005                         iov[niov++].iov_len = padding;
3006                         tx_size += padding;
3007                         pr_debug("Attaching %u additional"
3008                                 " padding bytes.\n", padding);
3009                 }
3010                 if (conn->conn_ops->DataDigest) {
3011                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3012                                 cmd->buf_ptr, cmd->buf_ptr_size,
3013                                 padding, (u8 *)&cmd->pad_bytes,
3014                                 (u8 *)&cmd->data_crc);
3015
3016                         iov[niov].iov_base = &cmd->data_crc;
3017                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3018                         tx_size += ISCSI_CRC_LEN;
3019                         pr_debug("Attached DataDigest for %u"
3020                                 " bytes of ping data, CRC 0x%08x\n",
3021                                 cmd->buf_ptr_size, cmd->data_crc);
3022                 }
3023         }
3024
3025         cmd->iov_misc_count = niov;
3026         cmd->tx_size = tx_size;
3027
3028         return 0;
3029 }
3030
3031 static int iscsit_send_r2t(
3032         struct iscsi_cmd *cmd,
3033         struct iscsi_conn *conn)
3034 {
3035         int tx_size = 0;
3036         struct iscsi_r2t *r2t;
3037         struct iscsi_r2t_rsp *hdr;
3038         int ret;
3039
3040         r2t = iscsit_get_r2t_from_list(cmd);
3041         if (!r2t)
3042                 return -1;
3043
3044         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3045         memset(hdr, 0, ISCSI_HDR_LEN);
3046         hdr->opcode             = ISCSI_OP_R2T;
3047         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3048         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3049                         (struct scsi_lun *)&hdr->lun);
3050         hdr->itt                = cmd->init_task_tag;
3051         r2t->targ_xfer_tag      = session_get_next_ttt(conn->sess);
3052         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3053         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3054         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3055         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3056         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3057         hdr->data_offset        = cpu_to_be32(r2t->offset);
3058         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3059
3060         cmd->iov_misc[0].iov_base       = cmd->pdu;
3061         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3062         tx_size += ISCSI_HDR_LEN;
3063
3064         if (conn->conn_ops->HeaderDigest) {
3065                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3066
3067                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3068                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3069
3070                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3071                 tx_size += ISCSI_CRC_LEN;
3072                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3073                         " PDU 0x%08x\n", *header_digest);
3074         }
3075
3076         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3077                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3078                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3079                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3080                         r2t->offset, r2t->xfer_len, conn->cid);
3081
3082         cmd->iov_misc_count = 1;
3083         cmd->tx_size = tx_size;
3084
3085         spin_lock_bh(&cmd->r2t_lock);
3086         r2t->sent_r2t = 1;
3087         spin_unlock_bh(&cmd->r2t_lock);
3088
3089         ret = iscsit_send_tx_data(cmd, conn, 1);
3090         if (ret < 0) {
3091                 iscsit_tx_thread_wait_for_tcp(conn);
3092                 return ret;
3093         }
3094
3095         spin_lock_bh(&cmd->dataout_timeout_lock);
3096         iscsit_start_dataout_timer(cmd, conn);
3097         spin_unlock_bh(&cmd->dataout_timeout_lock);
3098
3099         return 0;
3100 }
3101
3102 /*
3103  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3104  *              connection recovery.
3105  */
3106 int iscsit_build_r2ts_for_cmd(
3107         struct iscsi_conn *conn,
3108         struct iscsi_cmd *cmd,
3109         bool recovery)
3110 {
3111         int first_r2t = 1;
3112         u32 offset = 0, xfer_len = 0;
3113
3114         spin_lock_bh(&cmd->r2t_lock);
3115         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3116                 spin_unlock_bh(&cmd->r2t_lock);
3117                 return 0;
3118         }
3119
3120         if (conn->sess->sess_ops->DataSequenceInOrder &&
3121             !recovery)
3122                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3123
3124         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3125                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3126                         offset = cmd->r2t_offset;
3127
3128                         if (first_r2t && recovery) {
3129                                 int new_data_end = offset +
3130                                         conn->sess->sess_ops->MaxBurstLength -
3131                                         cmd->next_burst_len;
3132
3133                                 if (new_data_end > cmd->se_cmd.data_length)
3134                                         xfer_len = cmd->se_cmd.data_length - offset;
3135                                 else
3136                                         xfer_len =
3137                                                 conn->sess->sess_ops->MaxBurstLength -
3138                                                 cmd->next_burst_len;
3139                         } else {
3140                                 int new_data_end = offset +
3141                                         conn->sess->sess_ops->MaxBurstLength;
3142
3143                                 if (new_data_end > cmd->se_cmd.data_length)
3144                                         xfer_len = cmd->se_cmd.data_length - offset;
3145                                 else
3146                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3147                         }
3148                         cmd->r2t_offset += xfer_len;
3149
3150                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3151                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3152                 } else {
3153                         struct iscsi_seq *seq;
3154
3155                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3156                         if (!seq) {
3157                                 spin_unlock_bh(&cmd->r2t_lock);
3158                                 return -1;
3159                         }
3160
3161                         offset = seq->offset;
3162                         xfer_len = seq->xfer_len;
3163
3164                         if (cmd->seq_send_order == cmd->seq_count)
3165                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3166                 }
3167                 cmd->outstanding_r2ts++;
3168                 first_r2t = 0;
3169
3170                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3171                         spin_unlock_bh(&cmd->r2t_lock);
3172                         return -1;
3173                 }
3174
3175                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3176                         break;
3177         }
3178         spin_unlock_bh(&cmd->r2t_lock);
3179
3180         return 0;
3181 }
3182
3183 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3184                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3185 {
3186         if (inc_stat_sn)
3187                 cmd->stat_sn = conn->stat_sn++;
3188
3189         atomic_long_inc(&conn->sess->rsp_pdus);
3190
3191         memset(hdr, 0, ISCSI_HDR_LEN);
3192         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3193         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3194         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3195                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3196                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3197         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3198                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3199                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3200         }
3201         hdr->response           = cmd->iscsi_response;
3202         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3203         hdr->itt                = cmd->init_task_tag;
3204         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3205
3206         iscsit_increment_maxcmdsn(cmd, conn->sess);
3207         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3208         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3209
3210         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3211                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3212                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3213                 cmd->se_cmd.scsi_status, conn->cid);
3214 }
3215 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3216
3217 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3218 {
3219         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3220         struct kvec *iov;
3221         u32 padding = 0, tx_size = 0;
3222         int iov_count = 0;
3223         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3224
3225         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3226
3227         iov = &cmd->iov_misc[0];
3228         iov[iov_count].iov_base = cmd->pdu;
3229         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3230         tx_size += ISCSI_HDR_LEN;
3231
3232         /*
3233          * Attach SENSE DATA payload to iSCSI Response PDU
3234          */
3235         if (cmd->se_cmd.sense_buffer &&
3236            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3237             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3238                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3239                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3240
3241                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3242                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3243                 iov[iov_count].iov_base = cmd->sense_buffer;
3244                 iov[iov_count++].iov_len =
3245                                 (cmd->se_cmd.scsi_sense_length + padding);
3246                 tx_size += cmd->se_cmd.scsi_sense_length;
3247
3248                 if (padding) {
3249                         memset(cmd->sense_buffer +
3250                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3251                         tx_size += padding;
3252                         pr_debug("Adding %u bytes of padding to"
3253                                 " SENSE.\n", padding);
3254                 }
3255
3256                 if (conn->conn_ops->DataDigest) {
3257                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3258                                 cmd->sense_buffer,
3259                                 (cmd->se_cmd.scsi_sense_length + padding),
3260                                 0, NULL, (u8 *)&cmd->data_crc);
3261
3262                         iov[iov_count].iov_base    = &cmd->data_crc;
3263                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3264                         tx_size += ISCSI_CRC_LEN;
3265
3266                         pr_debug("Attaching CRC32 DataDigest for"
3267                                 " SENSE, %u bytes CRC 0x%08x\n",
3268                                 (cmd->se_cmd.scsi_sense_length + padding),
3269                                 cmd->data_crc);
3270                 }
3271
3272                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3273                                 " Response PDU\n",
3274                                 cmd->se_cmd.scsi_sense_length);
3275         }
3276
3277         if (conn->conn_ops->HeaderDigest) {
3278                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3279
3280                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3281                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3282
3283                 iov[0].iov_len += ISCSI_CRC_LEN;
3284                 tx_size += ISCSI_CRC_LEN;
3285                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3286                                 " PDU 0x%08x\n", *header_digest);
3287         }
3288
3289         cmd->iov_misc_count = iov_count;
3290         cmd->tx_size = tx_size;
3291
3292         return 0;
3293 }
3294
3295 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3296 {
3297         switch (se_tmr->response) {
3298         case TMR_FUNCTION_COMPLETE:
3299                 return ISCSI_TMF_RSP_COMPLETE;
3300         case TMR_TASK_DOES_NOT_EXIST:
3301                 return ISCSI_TMF_RSP_NO_TASK;
3302         case TMR_LUN_DOES_NOT_EXIST:
3303                 return ISCSI_TMF_RSP_NO_LUN;
3304         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3305                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3306         case TMR_FUNCTION_REJECTED:
3307         default:
3308                 return ISCSI_TMF_RSP_REJECTED;
3309         }
3310 }
3311
3312 void
3313 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3314                           struct iscsi_tm_rsp *hdr)
3315 {
3316         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3317
3318         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3319         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3320         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3321         hdr->itt                = cmd->init_task_tag;
3322         cmd->stat_sn            = conn->stat_sn++;
3323         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3324
3325         iscsit_increment_maxcmdsn(cmd, conn->sess);
3326         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3327         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3328
3329         pr_debug("Built Task Management Response ITT: 0x%08x,"
3330                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3331                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3332 }
3333 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3334
3335 static int
3336 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3337 {
3338         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3339         u32 tx_size = 0;
3340
3341         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3342
3343         cmd->iov_misc[0].iov_base       = cmd->pdu;
3344         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3345         tx_size += ISCSI_HDR_LEN;
3346
3347         if (conn->conn_ops->HeaderDigest) {
3348                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3349
3350                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3351                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3352
3353                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3354                 tx_size += ISCSI_CRC_LEN;
3355                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3356                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3357         }
3358
3359         cmd->iov_misc_count = 1;
3360         cmd->tx_size = tx_size;
3361
3362         return 0;
3363 }
3364
3365 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3366 {
3367         bool ret = false;
3368
3369         if (np->np_sockaddr.ss_family == AF_INET6) {
3370                 const struct sockaddr_in6 sin6 = {
3371                         .sin6_addr = IN6ADDR_ANY_INIT };
3372                 struct sockaddr_in6 *sock_in6 =
3373                          (struct sockaddr_in6 *)&np->np_sockaddr;
3374
3375                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3376                                 sin6.sin6_addr.s6_addr, 16))
3377                         ret = true;
3378         } else {
3379                 struct sockaddr_in * sock_in =
3380                         (struct sockaddr_in *)&np->np_sockaddr;
3381
3382                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3383                         ret = true;
3384         }
3385
3386         return ret;
3387 }
3388
3389 #define SENDTARGETS_BUF_LIMIT 32768U
3390
3391 static int
3392 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3393                                   enum iscsit_transport_type network_transport,
3394                                   int skip_bytes, bool *completed)
3395 {
3396         char *payload = NULL;
3397         struct iscsi_conn *conn = cmd->conn;
3398         struct iscsi_portal_group *tpg;
3399         struct iscsi_tiqn *tiqn;
3400         struct iscsi_tpg_np *tpg_np;
3401         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3402         int target_name_printed;
3403         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3404         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3405
3406         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3407                          SENDTARGETS_BUF_LIMIT);
3408
3409         payload = kzalloc(buffer_len, GFP_KERNEL);
3410         if (!payload) {
3411                 pr_err("Unable to allocate memory for sendtargets"
3412                                 " response.\n");
3413                 return -ENOMEM;
3414         }
3415         /*
3416          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3417          * explicit case..
3418          */
3419         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3420                 text_ptr = strchr(text_in, '=');
3421                 if (!text_ptr) {
3422                         pr_err("Unable to locate '=' string in text_in:"
3423                                " %s\n", text_in);
3424                         kfree(payload);
3425                         return -EINVAL;
3426                 }
3427                 /*
3428                  * Skip over '=' character..
3429                  */
3430                 text_ptr += 1;
3431         }
3432
3433         spin_lock(&tiqn_lock);
3434         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3435                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3436                      strcmp(tiqn->tiqn, text_ptr)) {
3437                         continue;
3438                 }
3439
3440                 target_name_printed = 0;
3441
3442                 spin_lock(&tiqn->tiqn_tpg_lock);
3443                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3444
3445                         /* If demo_mode_discovery=0 and generate_node_acls=0
3446                          * (demo mode dislabed) do not return
3447                          * TargetName+TargetAddress unless a NodeACL exists.
3448                          */
3449
3450                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3451                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3452                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3453                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3454                                 continue;
3455                         }
3456
3457                         spin_lock(&tpg->tpg_state_lock);
3458                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3459                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3460                                 spin_unlock(&tpg->tpg_state_lock);
3461                                 continue;
3462                         }
3463                         spin_unlock(&tpg->tpg_state_lock);
3464
3465                         spin_lock(&tpg->tpg_np_lock);
3466                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3467                                                 tpg_np_list) {
3468                                 struct iscsi_np *np = tpg_np->tpg_np;
3469                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3470
3471                                 if (np->np_network_transport != network_transport)
3472                                         continue;
3473
3474                                 if (!target_name_printed) {
3475                                         len = sprintf(buf, "TargetName=%s",
3476                                                       tiqn->tiqn);
3477                                         len += 1;
3478
3479                                         if ((len + payload_len) > buffer_len) {
3480                                                 spin_unlock(&tpg->tpg_np_lock);
3481                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3482                                                 end_of_buf = 1;
3483                                                 goto eob;
3484                                         }
3485
3486                                         if (skip_bytes && len <= skip_bytes) {
3487                                                 skip_bytes -= len;
3488                                         } else {
3489                                                 memcpy(payload + payload_len, buf, len);
3490                                                 payload_len += len;
3491                                                 target_name_printed = 1;
3492                                                 if (len > skip_bytes)
3493                                                         skip_bytes = 0;
3494                                         }
3495                                 }
3496
3497                                 len = sprintf(buf, "TargetAddress="
3498                                         "%s:%hu,%hu",
3499                                         inaddr_any ? conn->local_ip : np->np_ip,
3500                                         np->np_port,
3501                                         tpg->tpgt);
3502                                 len += 1;
3503
3504                                 if ((len + payload_len) > buffer_len) {
3505                                         spin_unlock(&tpg->tpg_np_lock);
3506                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3507                                         end_of_buf = 1;
3508                                         goto eob;
3509                                 }
3510
3511                                 if (skip_bytes && len <= skip_bytes) {
3512                                         skip_bytes -= len;
3513                                 } else {
3514                                         memcpy(payload + payload_len, buf, len);
3515                                         payload_len += len;
3516                                         if (len > skip_bytes)
3517                                                 skip_bytes = 0;
3518                                 }
3519                         }
3520                         spin_unlock(&tpg->tpg_np_lock);
3521                 }
3522                 spin_unlock(&tiqn->tiqn_tpg_lock);
3523 eob:
3524                 if (end_of_buf) {
3525                         *completed = false;
3526                         break;
3527                 }
3528
3529                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3530                         break;
3531         }
3532         spin_unlock(&tiqn_lock);
3533
3534         cmd->buf_ptr = payload;
3535
3536         return payload_len;
3537 }
3538
3539 int
3540 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3541                       struct iscsi_text_rsp *hdr,
3542                       enum iscsit_transport_type network_transport)
3543 {
3544         int text_length, padding;
3545         bool completed = true;
3546
3547         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3548                                                         cmd->read_data_done,
3549                                                         &completed);
3550         if (text_length < 0)
3551                 return text_length;
3552
3553         if (completed) {
3554                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3555         } else {
3556                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3557                 cmd->read_data_done += text_length;
3558                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3559                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3560         }
3561         hdr->opcode = ISCSI_OP_TEXT_RSP;
3562         padding = ((-text_length) & 3);
3563         hton24(hdr->dlength, text_length);
3564         hdr->itt = cmd->init_task_tag;
3565         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3566         cmd->stat_sn = conn->stat_sn++;
3567         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3568
3569         iscsit_increment_maxcmdsn(cmd, conn->sess);
3570         /*
3571          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3572          * correctly increment MaxCmdSN for each response answering a
3573          * non immediate text request with a valid CmdSN.
3574          */
3575         cmd->maxcmdsn_inc = 0;
3576         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3577         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3578
3579         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3580                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3581                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3582                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3583                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3584
3585         return text_length + padding;
3586 }
3587 EXPORT_SYMBOL(iscsit_build_text_rsp);
3588
3589 static int iscsit_send_text_rsp(
3590         struct iscsi_cmd *cmd,
3591         struct iscsi_conn *conn)
3592 {
3593         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3594         struct kvec *iov;
3595         u32 tx_size = 0;
3596         int text_length, iov_count = 0, rc;
3597
3598         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3599         if (rc < 0)
3600                 return rc;
3601
3602         text_length = rc;
3603         iov = &cmd->iov_misc[0];
3604         iov[iov_count].iov_base = cmd->pdu;
3605         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3606         iov[iov_count].iov_base = cmd->buf_ptr;
3607         iov[iov_count++].iov_len = text_length;
3608
3609         tx_size += (ISCSI_HDR_LEN + text_length);
3610
3611         if (conn->conn_ops->HeaderDigest) {
3612                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3613
3614                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3615                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3616
3617                 iov[0].iov_len += ISCSI_CRC_LEN;
3618                 tx_size += ISCSI_CRC_LEN;
3619                 pr_debug("Attaching CRC32 HeaderDigest for"
3620                         " Text Response PDU 0x%08x\n", *header_digest);
3621         }
3622
3623         if (conn->conn_ops->DataDigest) {
3624                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3625                                 cmd->buf_ptr, text_length,
3626                                 0, NULL, (u8 *)&cmd->data_crc);
3627
3628                 iov[iov_count].iov_base = &cmd->data_crc;
3629                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3630                 tx_size += ISCSI_CRC_LEN;
3631
3632                 pr_debug("Attaching DataDigest for %u bytes of text"
3633                         " data, CRC 0x%08x\n", text_length,
3634                         cmd->data_crc);
3635         }
3636
3637         cmd->iov_misc_count = iov_count;
3638         cmd->tx_size = tx_size;
3639
3640         return 0;
3641 }
3642
3643 void
3644 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3645                     struct iscsi_reject *hdr)
3646 {
3647         hdr->opcode             = ISCSI_OP_REJECT;
3648         hdr->reason             = cmd->reject_reason;
3649         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3650         hton24(hdr->dlength, ISCSI_HDR_LEN);
3651         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3652         cmd->stat_sn            = conn->stat_sn++;
3653         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3654         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3655         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3656
3657 }
3658 EXPORT_SYMBOL(iscsit_build_reject);
3659
3660 static int iscsit_send_reject(
3661         struct iscsi_cmd *cmd,
3662         struct iscsi_conn *conn)
3663 {
3664         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3665         struct kvec *iov;
3666         u32 iov_count = 0, tx_size;
3667
3668         iscsit_build_reject(cmd, conn, hdr);
3669
3670         iov = &cmd->iov_misc[0];
3671         iov[iov_count].iov_base = cmd->pdu;
3672         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3673         iov[iov_count].iov_base = cmd->buf_ptr;
3674         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3675
3676         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3677
3678         if (conn->conn_ops->HeaderDigest) {
3679                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3680
3681                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3682                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3683
3684                 iov[0].iov_len += ISCSI_CRC_LEN;
3685                 tx_size += ISCSI_CRC_LEN;
3686                 pr_debug("Attaching CRC32 HeaderDigest for"
3687                         " REJECT PDU 0x%08x\n", *header_digest);
3688         }
3689
3690         if (conn->conn_ops->DataDigest) {
3691                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3692                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3693
3694                 iov[iov_count].iov_base = &cmd->data_crc;
3695                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3696                 tx_size += ISCSI_CRC_LEN;
3697                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3698                                 " PDU 0x%08x\n", cmd->data_crc);
3699         }
3700
3701         cmd->iov_misc_count = iov_count;
3702         cmd->tx_size = tx_size;
3703
3704         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3705                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3706
3707         return 0;
3708 }
3709
3710 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3711 {
3712         int ord, cpu;
3713         /*
3714          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3715          * within iscsit_start_kthreads()
3716          *
3717          * Here we use bitmap_id to determine which CPU that this
3718          * iSCSI connection's RX/TX threads will be scheduled to
3719          * execute upon.
3720          */
3721         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3722         for_each_online_cpu(cpu) {
3723                 if (ord-- == 0) {
3724                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3725                         return;
3726                 }
3727         }
3728         /*
3729          * This should never be reached..
3730          */
3731         dump_stack();
3732         cpumask_setall(conn->conn_cpumask);
3733 }
3734
3735 static inline void iscsit_thread_check_cpumask(
3736         struct iscsi_conn *conn,
3737         struct task_struct *p,
3738         int mode)
3739 {
3740         /*
3741          * mode == 1 signals iscsi_target_tx_thread() usage.
3742          * mode == 0 signals iscsi_target_rx_thread() usage.
3743          */
3744         if (mode == 1) {
3745                 if (!conn->conn_tx_reset_cpumask)
3746                         return;
3747                 conn->conn_tx_reset_cpumask = 0;
3748         } else {
3749                 if (!conn->conn_rx_reset_cpumask)
3750                         return;
3751                 conn->conn_rx_reset_cpumask = 0;
3752         }
3753         /*
3754          * Update the CPU mask for this single kthread so that
3755          * both TX and RX kthreads are scheduled to run on the
3756          * same CPU.
3757          */
3758         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3759 }
3760
3761 static int
3762 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3763 {
3764         int ret;
3765
3766         switch (state) {
3767         case ISTATE_SEND_R2T:
3768                 ret = iscsit_send_r2t(cmd, conn);
3769                 if (ret < 0)
3770                         goto err;
3771                 break;
3772         case ISTATE_REMOVE:
3773                 spin_lock_bh(&conn->cmd_lock);
3774                 list_del_init(&cmd->i_conn_node);
3775                 spin_unlock_bh(&conn->cmd_lock);
3776
3777                 iscsit_free_cmd(cmd, false);
3778                 break;
3779         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3780                 iscsit_mod_nopin_response_timer(conn);
3781                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3782                 if (ret < 0)
3783                         goto err;
3784                 break;
3785         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3786                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3787                 if (ret < 0)
3788                         goto err;
3789                 break;
3790         default:
3791                 pr_err("Unknown Opcode: 0x%02x ITT:"
3792                        " 0x%08x, i_state: %d on CID: %hu\n",
3793                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3794                        conn->cid);
3795                 goto err;
3796         }
3797
3798         return 0;
3799
3800 err:
3801         return -1;
3802 }
3803
3804 static int
3805 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3806 {
3807         struct iscsit_transport *t = conn->conn_transport;
3808         struct iscsi_queue_req *qr;
3809         struct iscsi_cmd *cmd;
3810         u8 state;
3811         int ret;
3812
3813         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3814                 atomic_set(&conn->check_immediate_queue, 0);
3815                 cmd = qr->cmd;
3816                 state = qr->state;
3817                 kmem_cache_free(lio_qr_cache, qr);
3818
3819                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3820                 if (ret < 0)
3821                         return ret;
3822         }
3823
3824         return 0;
3825 }
3826
3827 static int
3828 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3829 {
3830         int ret;
3831
3832 check_rsp_state:
3833         switch (state) {
3834         case ISTATE_SEND_DATAIN:
3835                 ret = iscsit_send_datain(cmd, conn);
3836                 if (ret < 0)
3837                         goto err;
3838                 else if (!ret)
3839                         /* more drs */
3840                         goto check_rsp_state;
3841                 else if (ret == 1) {
3842                         /* all done */
3843                         spin_lock_bh(&cmd->istate_lock);
3844                         cmd->i_state = ISTATE_SENT_STATUS;
3845                         spin_unlock_bh(&cmd->istate_lock);
3846
3847                         if (atomic_read(&conn->check_immediate_queue))
3848                                 return 1;
3849
3850                         return 0;
3851                 } else if (ret == 2) {
3852                         /* Still must send status,
3853                            SCF_TRANSPORT_TASK_SENSE was set */
3854                         spin_lock_bh(&cmd->istate_lock);
3855                         cmd->i_state = ISTATE_SEND_STATUS;
3856                         spin_unlock_bh(&cmd->istate_lock);
3857                         state = ISTATE_SEND_STATUS;
3858                         goto check_rsp_state;
3859                 }
3860
3861                 break;
3862         case ISTATE_SEND_STATUS:
3863         case ISTATE_SEND_STATUS_RECOVERY:
3864                 ret = iscsit_send_response(cmd, conn);
3865                 break;
3866         case ISTATE_SEND_LOGOUTRSP:
3867                 ret = iscsit_send_logout(cmd, conn);
3868                 break;
3869         case ISTATE_SEND_ASYNCMSG:
3870                 ret = iscsit_send_conn_drop_async_message(
3871                         cmd, conn);
3872                 break;
3873         case ISTATE_SEND_NOPIN:
3874                 ret = iscsit_send_nopin(cmd, conn);
3875                 break;
3876         case ISTATE_SEND_REJECT:
3877                 ret = iscsit_send_reject(cmd, conn);
3878                 break;
3879         case ISTATE_SEND_TASKMGTRSP:
3880                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3881                 if (ret != 0)
3882                         break;
3883                 ret = iscsit_tmr_post_handler(cmd, conn);
3884                 if (ret != 0)
3885                         iscsit_fall_back_to_erl0(conn->sess);
3886                 break;
3887         case ISTATE_SEND_TEXTRSP:
3888                 ret = iscsit_send_text_rsp(cmd, conn);
3889                 break;
3890         default:
3891                 pr_err("Unknown Opcode: 0x%02x ITT:"
3892                        " 0x%08x, i_state: %d on CID: %hu\n",
3893                        cmd->iscsi_opcode, cmd->init_task_tag,
3894                        state, conn->cid);
3895                 goto err;
3896         }
3897         if (ret < 0)
3898                 goto err;
3899
3900         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3901                 iscsit_tx_thread_wait_for_tcp(conn);
3902                 iscsit_unmap_iovec(cmd);
3903                 goto err;
3904         }
3905         iscsit_unmap_iovec(cmd);
3906
3907         switch (state) {
3908         case ISTATE_SEND_LOGOUTRSP:
3909                 if (!iscsit_logout_post_handler(cmd, conn))
3910                         return -ECONNRESET;
3911                 /* fall through */
3912         case ISTATE_SEND_STATUS:
3913         case ISTATE_SEND_ASYNCMSG:
3914         case ISTATE_SEND_NOPIN:
3915         case ISTATE_SEND_STATUS_RECOVERY:
3916         case ISTATE_SEND_TEXTRSP:
3917         case ISTATE_SEND_TASKMGTRSP:
3918         case ISTATE_SEND_REJECT:
3919                 spin_lock_bh(&cmd->istate_lock);
3920                 cmd->i_state = ISTATE_SENT_STATUS;
3921                 spin_unlock_bh(&cmd->istate_lock);
3922                 break;
3923         default:
3924                 pr_err("Unknown Opcode: 0x%02x ITT:"
3925                        " 0x%08x, i_state: %d on CID: %hu\n",
3926                        cmd->iscsi_opcode, cmd->init_task_tag,
3927                        cmd->i_state, conn->cid);
3928                 goto err;
3929         }
3930
3931         if (atomic_read(&conn->check_immediate_queue))
3932                 return 1;
3933
3934         return 0;
3935
3936 err:
3937         return -1;
3938 }
3939
3940 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3941 {
3942         struct iscsit_transport *t = conn->conn_transport;
3943         struct iscsi_queue_req *qr;
3944         struct iscsi_cmd *cmd;
3945         u8 state;
3946         int ret;
3947
3948         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3949                 cmd = qr->cmd;
3950                 state = qr->state;
3951                 kmem_cache_free(lio_qr_cache, qr);
3952
3953                 ret = t->iscsit_response_queue(conn, cmd, state);
3954                 if (ret == 1 || ret < 0)
3955                         return ret;
3956         }
3957
3958         return 0;
3959 }
3960
3961 int iscsi_target_tx_thread(void *arg)
3962 {
3963         int ret = 0;
3964         struct iscsi_conn *conn = arg;
3965         /*
3966          * Allow ourselves to be interrupted by SIGINT so that a
3967          * connection recovery / failure event can be triggered externally.
3968          */
3969         allow_signal(SIGINT);
3970
3971         while (!kthread_should_stop()) {
3972                 /*
3973                  * Ensure that both TX and RX per connection kthreads
3974                  * are scheduled to run on the same CPU.
3975                  */
3976                 iscsit_thread_check_cpumask(conn, current, 1);
3977
3978                 wait_event_interruptible(conn->queues_wq,
3979                                          !iscsit_conn_all_queues_empty(conn));
3980
3981                 if (signal_pending(current))
3982                         goto transport_err;
3983
3984 get_immediate:
3985                 ret = iscsit_handle_immediate_queue(conn);
3986                 if (ret < 0)
3987                         goto transport_err;
3988
3989                 ret = iscsit_handle_response_queue(conn);
3990                 if (ret == 1)
3991                         goto get_immediate;
3992                 else if (ret == -ECONNRESET)
3993                         goto out;
3994                 else if (ret < 0)
3995                         goto transport_err;
3996         }
3997
3998 transport_err:
3999         iscsit_take_action_for_connection_exit(conn);
4000 out:
4001         return 0;
4002 }
4003
4004 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4005 {
4006         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4007         struct iscsi_cmd *cmd;
4008         int ret = 0;
4009
4010         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4011         case ISCSI_OP_SCSI_CMD:
4012                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4013                 if (!cmd)
4014                         goto reject;
4015
4016                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4017                 break;
4018         case ISCSI_OP_SCSI_DATA_OUT:
4019                 ret = iscsit_handle_data_out(conn, buf);
4020                 break;
4021         case ISCSI_OP_NOOP_OUT:
4022                 cmd = NULL;
4023                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4024                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4025                         if (!cmd)
4026                                 goto reject;
4027                 }
4028                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4029                 break;
4030         case ISCSI_OP_SCSI_TMFUNC:
4031                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4032                 if (!cmd)
4033                         goto reject;
4034
4035                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4036                 break;
4037         case ISCSI_OP_TEXT:
4038                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4039                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4040                         if (!cmd)
4041                                 goto reject;
4042                 } else {
4043                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4044                         if (!cmd)
4045                                 goto reject;
4046                 }
4047
4048                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4049                 break;
4050         case ISCSI_OP_LOGOUT:
4051                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4052                 if (!cmd)
4053                         goto reject;
4054
4055                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4056                 if (ret > 0)
4057                         wait_for_completion_timeout(&conn->conn_logout_comp,
4058                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4059                 break;
4060         case ISCSI_OP_SNACK:
4061                 ret = iscsit_handle_snack(conn, buf);
4062                 break;
4063         default:
4064                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4065                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4066                         pr_err("Cannot recover from unknown"
4067                         " opcode while ERL=0, closing iSCSI connection.\n");
4068                         return -1;
4069                 }
4070                 if (!conn->conn_ops->OFMarker) {
4071                         pr_err("Unable to recover from unknown"
4072                         " opcode while OFMarker=No, closing iSCSI"
4073                                 " connection.\n");
4074                         return -1;
4075                 }
4076                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4077                         pr_err("Unable to recover from unknown"
4078                                 " opcode, closing iSCSI connection.\n");
4079                         return -1;
4080                 }
4081                 break;
4082         }
4083
4084         return ret;
4085 reject:
4086         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4087 }
4088
4089 int iscsi_target_rx_thread(void *arg)
4090 {
4091         int ret;
4092         u8 buffer[ISCSI_HDR_LEN], opcode;
4093         u32 checksum = 0, digest = 0;
4094         struct iscsi_conn *conn = arg;
4095         struct kvec iov;
4096         /*
4097          * Allow ourselves to be interrupted by SIGINT so that a
4098          * connection recovery / failure event can be triggered externally.
4099          */
4100         allow_signal(SIGINT);
4101
4102         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4103                 struct completion comp;
4104                 int rc;
4105
4106                 init_completion(&comp);
4107                 rc = wait_for_completion_interruptible(&comp);
4108                 if (rc < 0)
4109                         goto transport_err;
4110
4111                 goto transport_err;
4112         }
4113
4114         while (!kthread_should_stop()) {
4115                 /*
4116                  * Ensure that both TX and RX per connection kthreads
4117                  * are scheduled to run on the same CPU.
4118                  */
4119                 iscsit_thread_check_cpumask(conn, current, 0);
4120
4121                 memset(buffer, 0, ISCSI_HDR_LEN);
4122                 memset(&iov, 0, sizeof(struct kvec));
4123
4124                 iov.iov_base    = buffer;
4125                 iov.iov_len     = ISCSI_HDR_LEN;
4126
4127                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4128                 if (ret != ISCSI_HDR_LEN) {
4129                         iscsit_rx_thread_wait_for_tcp(conn);
4130                         goto transport_err;
4131                 }
4132
4133                 if (conn->conn_ops->HeaderDigest) {
4134                         iov.iov_base    = &digest;
4135                         iov.iov_len     = ISCSI_CRC_LEN;
4136
4137                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4138                         if (ret != ISCSI_CRC_LEN) {
4139                                 iscsit_rx_thread_wait_for_tcp(conn);
4140                                 goto transport_err;
4141                         }
4142
4143                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4144                                         buffer, ISCSI_HDR_LEN,
4145                                         0, NULL, (u8 *)&checksum);
4146
4147                         if (digest != checksum) {
4148                                 pr_err("HeaderDigest CRC32C failed,"
4149                                         " received 0x%08x, computed 0x%08x\n",
4150                                         digest, checksum);
4151                                 /*
4152                                  * Set the PDU to 0xff so it will intentionally
4153                                  * hit default in the switch below.
4154                                  */
4155                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4156                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4157                         } else {
4158                                 pr_debug("Got HeaderDigest CRC32C"
4159                                                 " 0x%08x\n", checksum);
4160                         }
4161                 }
4162
4163                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4164                         goto transport_err;
4165
4166                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4167
4168                 if (conn->sess->sess_ops->SessionType &&
4169                    ((!(opcode & ISCSI_OP_TEXT)) ||
4170                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4171                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4172                         " while in Discovery Session, rejecting.\n", opcode);
4173                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4174                                           buffer);
4175                         goto transport_err;
4176                 }
4177
4178                 ret = iscsi_target_rx_opcode(conn, buffer);
4179                 if (ret < 0)
4180                         goto transport_err;
4181         }
4182
4183 transport_err:
4184         if (!signal_pending(current))
4185                 atomic_set(&conn->transport_failed, 1);
4186         iscsit_take_action_for_connection_exit(conn);
4187         return 0;
4188 }
4189
4190 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4191 {
4192         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4193         struct iscsi_session *sess = conn->sess;
4194         /*
4195          * We expect this function to only ever be called from either RX or TX
4196          * thread context via iscsit_close_connection() once the other context
4197          * has been reset -> returned sleeping pre-handler state.
4198          */
4199         spin_lock_bh(&conn->cmd_lock);
4200         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4201
4202                 list_del_init(&cmd->i_conn_node);
4203                 spin_unlock_bh(&conn->cmd_lock);
4204
4205                 iscsit_increment_maxcmdsn(cmd, sess);
4206
4207                 iscsit_free_cmd(cmd, true);
4208
4209                 spin_lock_bh(&conn->cmd_lock);
4210         }
4211         spin_unlock_bh(&conn->cmd_lock);
4212 }
4213
4214 static void iscsit_stop_timers_for_cmds(
4215         struct iscsi_conn *conn)
4216 {
4217         struct iscsi_cmd *cmd;
4218
4219         spin_lock_bh(&conn->cmd_lock);
4220         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4221                 if (cmd->data_direction == DMA_TO_DEVICE)
4222                         iscsit_stop_dataout_timer(cmd);
4223         }
4224         spin_unlock_bh(&conn->cmd_lock);
4225 }
4226
4227 int iscsit_close_connection(
4228         struct iscsi_conn *conn)
4229 {
4230         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4231         struct iscsi_session    *sess = conn->sess;
4232
4233         pr_debug("Closing iSCSI connection CID %hu on SID:"
4234                 " %u\n", conn->cid, sess->sid);
4235         /*
4236          * Always up conn_logout_comp just in case the RX Thread is sleeping
4237          * and the logout response never got sent because the connection
4238          * failed.
4239          */
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);