drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/idr.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_proto.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_fabric.h>
  32 #include <target/target_core_configfs.h>
  33
  34 #include <target/iscsi/iscsi_target_core.h>
  35 #include "iscsi_target_parameters.h"
  36 #include "iscsi_target_seq_pdu_list.h"
  37 #include "iscsi_target_datain_values.h"
  38 #include "iscsi_target_erl0.h"
  39 #include "iscsi_target_erl1.h"
  40 #include "iscsi_target_erl2.h"
  41 #include "iscsi_target_login.h"
  42 #include "iscsi_target_tmr.h"
  43 #include "iscsi_target_tpg.h"
  44 #include "iscsi_target_util.h"
  45 #include "iscsi_target.h"
  46 #include "iscsi_target_device.h"
  47 #include <target/iscsi/iscsi_target_stat.h>
  48
  49 #include <target/iscsi/iscsi_transport.h>
  50
  51 static LIST_HEAD(g_tiqn_list);
  52 static LIST_HEAD(g_np_list);
  53 static DEFINE_SPINLOCK(tiqn_lock);
  54 static DEFINE_MUTEX(np_lock);
  55
  56 static struct idr tiqn_idr;
  57 struct idr sess_idr;
  58 struct mutex auth_id_lock;
  59 spinlock_t sess_idr_lock;
  60
  61 struct iscsit_global *iscsit_global;
  62
  63 struct kmem_cache *lio_qr_cache;
  64 struct kmem_cache *lio_dr_cache;
  65 struct kmem_cache *lio_ooo_cache;
  66 struct kmem_cache *lio_r2t_cache;
  67
  68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  69                         struct iscsi_scsi_req *, u32);
  70
  71 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  72 {
  73         struct iscsi_tiqn *tiqn = NULL;
  74
  75         spin_lock(&tiqn_lock);
  76         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  77                 if (!strcmp(tiqn->tiqn, buf)) {
  78
  79                         spin_lock(&tiqn->tiqn_state_lock);
  80                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  81                                 tiqn->tiqn_access_count++;
  82                                 spin_unlock(&tiqn->tiqn_state_lock);
  83                                 spin_unlock(&tiqn_lock);
  84                                 return tiqn;
  85                         }
  86                         spin_unlock(&tiqn->tiqn_state_lock);
  87                 }
  88         }
  89         spin_unlock(&tiqn_lock);
  90
  91         return NULL;
  92 }
  93
  94 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  95 {
  96         spin_lock(&tiqn->tiqn_state_lock);
  97         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  98                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  99                 spin_unlock(&tiqn->tiqn_state_lock);
 100                 return 0;
 101         }
 102         spin_unlock(&tiqn->tiqn_state_lock);
 103
 104         return -1;
 105 }
 106
 107 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 108 {
 109         spin_lock(&tiqn->tiqn_state_lock);
 110         tiqn->tiqn_access_count--;
 111         spin_unlock(&tiqn->tiqn_state_lock);
 112 }
 113
 114 /*
 115  * Note that IQN formatting is expected to be done in userspace, and
 116  * no explict IQN format checks are done here.
 117  */
 118 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 119 {
 120         struct iscsi_tiqn *tiqn = NULL;
 121         int ret;
 122
 123         if (strlen(buf) >= ISCSI_IQN_LEN) {
 124                 pr_err("Target IQN exceeds %d bytes\n",
 125                                 ISCSI_IQN_LEN);
 126                 return ERR_PTR(-EINVAL);
 127         }
 128
 129         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 130         if (!tiqn) {
 131                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 132                 return ERR_PTR(-ENOMEM);
 133         }
 134
 135         sprintf(tiqn->tiqn, "%s", buf);
 136         INIT_LIST_HEAD(&tiqn->tiqn_list);
 137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 138         spin_lock_init(&tiqn->tiqn_state_lock);
 139         spin_lock_init(&tiqn->tiqn_tpg_lock);
 140         spin_lock_init(&tiqn->sess_err_stats.lock);
 141         spin_lock_init(&tiqn->login_stats.lock);
 142         spin_lock_init(&tiqn->logout_stats.lock);
 143
 144         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 145
 146         idr_preload(GFP_KERNEL);
 147         spin_lock(&tiqn_lock);
 148
 149         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 150         if (ret < 0) {
 151                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 152                 spin_unlock(&tiqn_lock);
 153                 idr_preload_end();
 154                 kfree(tiqn);
 155                 return ERR_PTR(ret);
 156         }
 157         tiqn->tiqn_index = ret;
 158         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 159
 160         spin_unlock(&tiqn_lock);
 161         idr_preload_end();
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         spin_unlock_bh(&np->np_thread_lock);
 220         /*
 221          * Determine if the portal group is accepting storage traffic.
 222          */
 223         spin_lock_bh(&tpg->tpg_state_lock);
 224         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 225                 spin_unlock_bh(&tpg->tpg_state_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&tpg->tpg_state_lock);
 229
 230         /*
 231          * Here we serialize access across the TIQN+TPG Tuple.
 232          */
 233         ret = down_interruptible(&tpg->np_login_sem);
 234         if (ret != 0)
 235                 return -1;
 236
 237         spin_lock_bh(&tpg->tpg_state_lock);
 238         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 239                 spin_unlock_bh(&tpg->tpg_state_lock);
 240                 up(&tpg->np_login_sem);
 241                 return -1;
 242         }
 243         spin_unlock_bh(&tpg->tpg_state_lock);
 244
 245         return 0;
 246 }
 247
 248 void iscsit_login_kref_put(struct kref *kref)
 249 {
 250         struct iscsi_tpg_np *tpg_np = container_of(kref,
 251                                 struct iscsi_tpg_np, tpg_np_kref);
 252
 253         complete(&tpg_np->tpg_np_comp);
 254 }
 255
 256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 257                        struct iscsi_tpg_np *tpg_np)
 258 {
 259         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 260
 261         up(&tpg->np_login_sem);
 262
 263         if (tpg_np)
 264                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 265
 266         if (tiqn)
 267                 iscsit_put_tiqn_for_login(tiqn);
 268
 269         return 0;
 270 }
 271
 272 bool iscsit_check_np_match(
 273         struct __kernel_sockaddr_storage *sockaddr,
 274         struct iscsi_np *np,
 275         int network_transport)
 276 {
 277         struct sockaddr_in *sock_in, *sock_in_e;
 278         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 279         bool ip_match = false;
 280         u16 port;
 281
 282         if (sockaddr->ss_family == AF_INET6) {
 283                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 284                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 285
 286                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 287                             &sock_in6_e->sin6_addr.in6_u,
 288                             sizeof(struct in6_addr)))
 289                         ip_match = true;
 290
 291                 port = ntohs(sock_in6->sin6_port);
 292         } else {
 293                 sock_in = (struct sockaddr_in *)sockaddr;
 294                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 295
 296                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 297                         ip_match = true;
 298
 299                 port = ntohs(sock_in->sin_port);
 300         }
 301
 302         if (ip_match && (np->np_port == port) &&
 303             (np->np_network_transport == network_transport))
 304                 return true;
 305
 306         return false;
 307 }
 308
 309 /*
 310  * Called with mutex np_lock held
 311  */
 312 static struct iscsi_np *iscsit_get_np(
 313         struct __kernel_sockaddr_storage *sockaddr,
 314         int network_transport)
 315 {
 316         struct iscsi_np *np;
 317         bool match;
 318
 319         list_for_each_entry(np, &g_np_list, np_list) {
 320                 spin_lock_bh(&np->np_thread_lock);
 321                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 322                         spin_unlock_bh(&np->np_thread_lock);
 323                         continue;
 324                 }
 325
 326                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 327                 if (match) {
 328                         /*
 329                          * Increment the np_exports reference count now to
 330                          * prevent iscsit_del_np() below from being called
 331                          * while iscsi_tpg_add_network_portal() is called.
 332                          */
 333                         np->np_exports++;
 334                         spin_unlock_bh(&np->np_thread_lock);
 335                         return np;
 336                 }
 337                 spin_unlock_bh(&np->np_thread_lock);
 338         }
 339
 340         return NULL;
 341 }
 342
 343 struct iscsi_np *iscsit_add_np(
 344         struct __kernel_sockaddr_storage *sockaddr,
 345         char *ip_str,
 346         int network_transport)
 347 {
 348         struct sockaddr_in *sock_in;
 349         struct sockaddr_in6 *sock_in6;
 350         struct iscsi_np *np;
 351         int ret;
 352
 353         mutex_lock(&np_lock);
 354
 355         /*
 356          * Locate the existing struct iscsi_np if already active..
 357          */
 358         np = iscsit_get_np(sockaddr, network_transport);
 359         if (np) {
 360                 mutex_unlock(&np_lock);
 361                 return np;
 362         }
 363
 364         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 365         if (!np) {
 366                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 367                 mutex_unlock(&np_lock);
 368                 return ERR_PTR(-ENOMEM);
 369         }
 370
 371         np->np_flags |= NPF_IP_NETWORK;
 372         if (sockaddr->ss_family == AF_INET6) {
 373                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 374                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 375                 np->np_port = ntohs(sock_in6->sin6_port);
 376         } else {
 377                 sock_in = (struct sockaddr_in *)sockaddr;
 378                 sprintf(np->np_ip, "%s", ip_str);
 379                 np->np_port = ntohs(sock_in->sin_port);
 380         }
 381
 382         np->np_network_transport = network_transport;
 383         spin_lock_init(&np->np_thread_lock);
 384         init_completion(&np->np_restart_comp);
 385         INIT_LIST_HEAD(&np->np_list);
 386
 387         ret = iscsi_target_setup_login_socket(np, sockaddr);
 388         if (ret != 0) {
 389                 kfree(np);
 390                 mutex_unlock(&np_lock);
 391                 return ERR_PTR(ret);
 392         }
 393
 394         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 395         if (IS_ERR(np->np_thread)) {
 396                 pr_err("Unable to create kthread: iscsi_np\n");
 397                 ret = PTR_ERR(np->np_thread);
 398                 kfree(np);
 399                 mutex_unlock(&np_lock);
 400                 return ERR_PTR(ret);
 401         }
 402         /*
 403          * Increment the np_exports reference count now to prevent
 404          * iscsit_del_np() below from being run while a new call to
 405          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 406          * active.  We don't need to hold np->np_thread_lock at this
 407          * point because iscsi_np has not been added to g_np_list yet.
 408          */
 409         np->np_exports = 1;
 410         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 411
 412         list_add_tail(&np->np_list, &g_np_list);
 413         mutex_unlock(&np_lock);
 414
 415         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 416                 np->np_ip, np->np_port, np->np_transport->name);
 417
 418         return np;
 419 }
 420
 421 int iscsit_reset_np_thread(
 422         struct iscsi_np *np,
 423         struct iscsi_tpg_np *tpg_np,
 424         struct iscsi_portal_group *tpg,
 425         bool shutdown)
 426 {
 427         spin_lock_bh(&np->np_thread_lock);
 428         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 429                 spin_unlock_bh(&np->np_thread_lock);
 430                 return 0;
 431         }
 432         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 433
 434         if (np->np_thread) {
 435                 spin_unlock_bh(&np->np_thread_lock);
 436                 send_sig(SIGINT, np->np_thread, 1);
 437                 wait_for_completion(&np->np_restart_comp);
 438                 spin_lock_bh(&np->np_thread_lock);
 439         }
 440         spin_unlock_bh(&np->np_thread_lock);
 441
 442         if (tpg_np && shutdown) {
 443                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 444
 445                 wait_for_completion(&tpg_np->tpg_np_comp);
 446         }
 447
 448         return 0;
 449 }
 450
 451 static void iscsit_free_np(struct iscsi_np *np)
 452 {
 453         if (np->np_socket)
 454                 sock_release(np->np_socket);
 455 }
 456
 457 int iscsit_del_np(struct iscsi_np *np)
 458 {
 459         spin_lock_bh(&np->np_thread_lock);
 460         np->np_exports--;
 461         if (np->np_exports) {
 462                 np->enabled = true;
 463                 spin_unlock_bh(&np->np_thread_lock);
 464                 return 0;
 465         }
 466         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 467         spin_unlock_bh(&np->np_thread_lock);
 468
 469         if (np->np_thread) {
 470                 /*
 471                  * We need to send the signal to wakeup Linux/Net
 472                  * which may be sleeping in sock_accept()..
 473                  */
 474                 send_sig(SIGINT, np->np_thread, 1);
 475                 kthread_stop(np->np_thread);
 476                 np->np_thread = NULL;
 477         }
 478
 479         np->np_transport->iscsit_free_np(np);
 480
 481         mutex_lock(&np_lock);
 482         list_del(&np->np_list);
 483         mutex_unlock(&np_lock);
 484
 485         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 486                 np->np_ip, np->np_port, np->np_transport->name);
 487
 488         iscsit_put_transport(np->np_transport);
 489         kfree(np);
 490         return 0;
 491 }
 492
 493 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 494 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 495
 496 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 497 {
 498         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 499         return 0;
 500 }
 501
 502 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 503 {
 504         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 505
 506         spin_lock_bh(&conn->cmd_lock);
 507         if (!list_empty(&cmd->i_conn_node))
 508                 list_del_init(&cmd->i_conn_node);
 509         spin_unlock_bh(&conn->cmd_lock);
 510
 511         __iscsit_free_cmd(cmd, scsi_cmd, true);
 512 }
 513
 514 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 515 {
 516         return TARGET_PROT_NORMAL;
 517 }
 518
 519 static struct iscsit_transport iscsi_target_transport = {
 520         .name                   = "iSCSI/TCP",
 521         .transport_type         = ISCSI_TCP,
 522         .owner                  = NULL,
 523         .iscsit_setup_np        = iscsit_setup_np,
 524         .iscsit_accept_np       = iscsit_accept_np,
 525         .iscsit_free_np         = iscsit_free_np,
 526         .iscsit_get_login_rx    = iscsit_get_login_rx,
 527         .iscsit_put_login_tx    = iscsit_put_login_tx,
 528         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 529         .iscsit_immediate_queue = iscsit_immediate_queue,
 530         .iscsit_response_queue  = iscsit_response_queue,
 531         .iscsit_queue_data_in   = iscsit_queue_rsp,
 532         .iscsit_queue_status    = iscsit_queue_rsp,
 533         .iscsit_aborted_task    = iscsit_aborted_task,
 534         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 535 };
 536
 537 static int __init iscsi_target_init_module(void)
 538 {
 539         int ret = 0, size;
 540
 541         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 542
 543         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 544         if (!iscsit_global) {
 545                 pr_err("Unable to allocate memory for iscsit_global\n");
 546                 return -1;
 547         }
 548         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 549         mutex_init(&auth_id_lock);
 550         spin_lock_init(&sess_idr_lock);
 551         idr_init(&tiqn_idr);
 552         idr_init(&sess_idr);
 553
 554         ret = target_register_template(&iscsi_ops);
 555         if (ret)
 556                 goto out;
 557
 558         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 559         iscsit_global->ts_bitmap = vzalloc(size);
 560         if (!iscsit_global->ts_bitmap) {
 561                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 562                 goto configfs_out;
 563         }
 564
 565         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 566                         sizeof(struct iscsi_queue_req),
 567                         __alignof__(struct iscsi_queue_req), 0, NULL);
 568         if (!lio_qr_cache) {
 569                 pr_err("nable to kmem_cache_create() for"
 570                                 " lio_qr_cache\n");
 571                 goto bitmap_out;
 572         }
 573
 574         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 575                         sizeof(struct iscsi_datain_req),
 576                         __alignof__(struct iscsi_datain_req), 0, NULL);
 577         if (!lio_dr_cache) {
 578                 pr_err("Unable to kmem_cache_create() for"
 579                                 " lio_dr_cache\n");
 580                 goto qr_out;
 581         }
 582
 583         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 584                         sizeof(struct iscsi_ooo_cmdsn),
 585                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 586         if (!lio_ooo_cache) {
 587                 pr_err("Unable to kmem_cache_create() for"
 588                                 " lio_ooo_cache\n");
 589                 goto dr_out;
 590         }
 591
 592         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 593                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 594                         0, NULL);
 595         if (!lio_r2t_cache) {
 596                 pr_err("Unable to kmem_cache_create() for"
 597                                 " lio_r2t_cache\n");
 598                 goto ooo_out;
 599         }
 600
 601         iscsit_register_transport(&iscsi_target_transport);
 602
 603         if (iscsit_load_discovery_tpg() < 0)
 604                 goto r2t_out;
 605
 606         return ret;
 607 r2t_out:
 608         iscsit_unregister_transport(&iscsi_target_transport);
 609         kmem_cache_destroy(lio_r2t_cache);
 610 ooo_out:
 611         kmem_cache_destroy(lio_ooo_cache);
 612 dr_out:
 613         kmem_cache_destroy(lio_dr_cache);
 614 qr_out:
 615         kmem_cache_destroy(lio_qr_cache);
 616 bitmap_out:
 617         vfree(iscsit_global->ts_bitmap);
 618 configfs_out:
 619         /* XXX: this probably wants it to be it's own unwind step.. */
 620         if (iscsit_global->discovery_tpg)
 621                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 622         target_unregister_template(&iscsi_ops);
 623 out:
 624         kfree(iscsit_global);
 625         return -ENOMEM;
 626 }
 627
 628 static void __exit iscsi_target_cleanup_module(void)
 629 {
 630         iscsit_release_discovery_tpg();
 631         iscsit_unregister_transport(&iscsi_target_transport);
 632         kmem_cache_destroy(lio_qr_cache);
 633         kmem_cache_destroy(lio_dr_cache);
 634         kmem_cache_destroy(lio_ooo_cache);
 635         kmem_cache_destroy(lio_r2t_cache);
 636
 637         /*
 638          * Shutdown discovery sessions and disable discovery TPG
 639          */
 640         if (iscsit_global->discovery_tpg)
 641                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 642
 643         target_unregister_template(&iscsi_ops);
 644
 645         vfree(iscsit_global->ts_bitmap);
 646         kfree(iscsit_global);
 647 }
 648
 649 static int iscsit_add_reject(
 650         struct iscsi_conn *conn,
 651         u8 reason,
 652         unsigned char *buf)
 653 {
 654         struct iscsi_cmd *cmd;
 655
 656         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 657         if (!cmd)
 658                 return -1;
 659
 660         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 661         cmd->reject_reason = reason;
 662
 663         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 664         if (!cmd->buf_ptr) {
 665                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 666                 iscsit_free_cmd(cmd, false);
 667                 return -1;
 668         }
 669
 670         spin_lock_bh(&conn->cmd_lock);
 671         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 672         spin_unlock_bh(&conn->cmd_lock);
 673
 674         cmd->i_state = ISTATE_SEND_REJECT;
 675         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 676
 677         return -1;
 678 }
 679
 680 static int iscsit_add_reject_from_cmd(
 681         struct iscsi_cmd *cmd,
 682         u8 reason,
 683         bool add_to_conn,
 684         unsigned char *buf)
 685 {
 686         struct iscsi_conn *conn;
 687
 688         if (!cmd->conn) {
 689                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 690                                 cmd->init_task_tag);
 691                 return -1;
 692         }
 693         conn = cmd->conn;
 694
 695         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 696         cmd->reject_reason = reason;
 697
 698         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 699         if (!cmd->buf_ptr) {
 700                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 701                 iscsit_free_cmd(cmd, false);
 702                 return -1;
 703         }
 704
 705         if (add_to_conn) {
 706                 spin_lock_bh(&conn->cmd_lock);
 707                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 708                 spin_unlock_bh(&conn->cmd_lock);
 709         }
 710
 711         cmd->i_state = ISTATE_SEND_REJECT;
 712         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 713         /*
 714          * Perform the kref_put now if se_cmd has already been setup by
 715          * scsit_setup_scsi_cmd()
 716          */
 717         if (cmd->se_cmd.se_tfo != NULL) {
 718                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 719                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 720         }
 721         return -1;
 722 }
 723
 724 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 725                                  unsigned char *buf)
 726 {
 727         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 728 }
 729
 730 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 731 {
 732         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 733 }
 734
 735 /*
 736  * Map some portion of the allocated scatterlist to an iovec, suitable for
 737  * kernel sockets to copy data in/out.
 738  */
 739 static int iscsit_map_iovec(
 740         struct iscsi_cmd *cmd,
 741         struct kvec *iov,
 742         u32 data_offset,
 743         u32 data_length)
 744 {
 745         u32 i = 0;
 746         struct scatterlist *sg;
 747         unsigned int page_off;
 748
 749         /*
 750          * We know each entry in t_data_sg contains a page.
 751          */
 752         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 753         page_off = (data_offset % PAGE_SIZE);
 754
 755         cmd->first_data_sg = sg;
 756         cmd->first_data_sg_off = page_off;
 757
 758         while (data_length) {
 759                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 760
 761                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 762                 iov[i].iov_len = cur_len;
 763
 764                 data_length -= cur_len;
 765                 page_off = 0;
 766                 sg = sg_next(sg);
 767                 i++;
 768         }
 769
 770         cmd->kmapped_nents = i;
 771
 772         return i;
 773 }
 774
 775 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 776 {
 777         u32 i;
 778         struct scatterlist *sg;
 779
 780         sg = cmd->first_data_sg;
 781
 782         for (i = 0; i < cmd->kmapped_nents; i++)
 783                 kunmap(sg_page(&sg[i]));
 784 }
 785
 786 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 787 {
 788         LIST_HEAD(ack_list);
 789         struct iscsi_cmd *cmd, *cmd_p;
 790
 791         conn->exp_statsn = exp_statsn;
 792
 793         if (conn->sess->sess_ops->RDMAExtensions)
 794                 return;
 795
 796         spin_lock_bh(&conn->cmd_lock);
 797         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 798                 spin_lock(&cmd->istate_lock);
 799                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 800                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 801                         cmd->i_state = ISTATE_REMOVE;
 802                         spin_unlock(&cmd->istate_lock);
 803                         list_move_tail(&cmd->i_conn_node, &ack_list);
 804                         continue;
 805                 }
 806                 spin_unlock(&cmd->istate_lock);
 807         }
 808         spin_unlock_bh(&conn->cmd_lock);
 809
 810         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 811                 list_del_init(&cmd->i_conn_node);
 812                 iscsit_free_cmd(cmd, false);
 813         }
 814 }
 815
 816 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 817 {
 818         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 819
 820         iov_count += ISCSI_IOV_DATA_BUFFER;
 821
 822         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 823         if (!cmd->iov_data) {
 824                 pr_err("Unable to allocate cmd->iov_data\n");
 825                 return -ENOMEM;
 826         }
 827
 828         cmd->orig_iov_data_count = iov_count;
 829         return 0;
 830 }
 831
 832 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 833                           unsigned char *buf)
 834 {
 835         int data_direction, payload_length;
 836         struct iscsi_scsi_req *hdr;
 837         int iscsi_task_attr;
 838         int sam_task_attr;
 839
 840         atomic_long_inc(&conn->sess->cmd_pdus);
 841
 842         hdr                     = (struct iscsi_scsi_req *) buf;
 843         payload_length          = ntoh24(hdr->dlength);
 844
 845         /* FIXME; Add checks for AdditionalHeaderSegment */
 846
 847         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 848             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 849                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 850                                 " not set. Bad iSCSI Initiator.\n");
 851                 return iscsit_add_reject_cmd(cmd,
 852                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 853         }
 854
 855         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 856              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 857                 /*
 858                  * From RFC-3720 Section 10.3.1:
 859                  *
 860                  * "Either or both of R and W MAY be 1 when either the
 861                  *  Expected Data Transfer Length and/or Bidirectional Read
 862                  *  Expected Data Transfer Length are 0"
 863                  *
 864                  * For this case, go ahead and clear the unnecssary bits
 865                  * to avoid any confusion with ->data_direction.
 866                  */
 867                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 868                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 869
 870                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 871                         " set when Expected Data Transfer Length is 0 for"
 872                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 873         }
 874
 875         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 876             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 877                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 878                         " MUST be set if Expected Data Transfer Length is not 0."
 879                         " Bad iSCSI Initiator\n");
 880                 return iscsit_add_reject_cmd(cmd,
 881                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 882         }
 883
 884         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 885             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 886                 pr_err("Bidirectional operations not supported!\n");
 887                 return iscsit_add_reject_cmd(cmd,
 888                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 889         }
 890
 891         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 892                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 893                                 " Scsi Command PDU.\n");
 894                 return iscsit_add_reject_cmd(cmd,
 895                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 896         }
 897
 898         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 899                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 900                         " protocol error.\n", payload_length);
 901                 return iscsit_add_reject_cmd(cmd,
 902                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 903         }
 904
 905         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 906             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 907                 pr_err("Expected Data Transfer Length and Length of"
 908                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 909                         " bit is not set protocol error\n");
 910                 return iscsit_add_reject_cmd(cmd,
 911                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 912         }
 913
 914         if (payload_length > be32_to_cpu(hdr->data_length)) {
 915                 pr_err("DataSegmentLength: %u is greater than"
 916                         " EDTL: %u, protocol error.\n", payload_length,
 917                                 hdr->data_length);
 918                 return iscsit_add_reject_cmd(cmd,
 919                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 920         }
 921
 922         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 923                 pr_err("DataSegmentLength: %u is greater than"
 924                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 925                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 926                 return iscsit_add_reject_cmd(cmd,
 927                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 928         }
 929
 930         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 931                 pr_err("DataSegmentLength: %u is greater than"
 932                         " FirstBurstLength: %u, protocol error.\n",
 933                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 934                 return iscsit_add_reject_cmd(cmd,
 935                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 936         }
 937
 938         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 939                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 940                           DMA_NONE;
 941
 942         cmd->data_direction = data_direction;
 943         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 944         /*
 945          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 946          */
 947         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 948             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 949                 sam_task_attr = TCM_SIMPLE_TAG;
 950         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 951                 sam_task_attr = TCM_ORDERED_TAG;
 952         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 953                 sam_task_attr = TCM_HEAD_TAG;
 954         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 955                 sam_task_attr = TCM_ACA_TAG;
 956         else {
 957                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 958                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
 959                 sam_task_attr = TCM_SIMPLE_TAG;
 960         }
 961
 962         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 963         cmd->i_state            = ISTATE_NEW_CMD;
 964         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 965         cmd->immediate_data     = (payload_length) ? 1 : 0;
 966         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 967                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 968         if (cmd->unsolicited_data)
 969                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 970
 971         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 972         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 973                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
 974         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 975                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 976         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 977         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 978         cmd->first_burst_len    = payload_length;
 979
 980         if (!conn->sess->sess_ops->RDMAExtensions &&
 981              cmd->data_direction == DMA_FROM_DEVICE) {
 982                 struct iscsi_datain_req *dr;
 983
 984                 dr = iscsit_allocate_datain_req();
 985                 if (!dr)
 986                         return iscsit_add_reject_cmd(cmd,
 987                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 988
 989                 iscsit_attach_datain_req(cmd, dr);
 990         }
 991
 992         /*
 993          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 994          */
 995         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
 996                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 997                         cmd->data_direction, sam_task_attr,
 998                         cmd->sense_buffer + 2);
 999
1000         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1001                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1002                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1003                 conn->cid);
1004
1005         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1006
1007         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1008                                                      scsilun_to_int(&hdr->lun));
1009         if (cmd->sense_reason)
1010                 goto attach_cmd;
1011
1012         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1013         if (cmd->sense_reason) {
1014                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1015                         return iscsit_add_reject_cmd(cmd,
1016                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1017                 }
1018
1019                 goto attach_cmd;
1020         }
1021
1022         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1023                 return iscsit_add_reject_cmd(cmd,
1024                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1025         }
1026
1027 attach_cmd:
1028         spin_lock_bh(&conn->cmd_lock);
1029         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1030         spin_unlock_bh(&conn->cmd_lock);
1031         /*
1032          * Check if we need to delay processing because of ALUA
1033          * Active/NonOptimized primary access state..
1034          */
1035         core_alua_check_nonop_delay(&cmd->se_cmd);
1036
1037         return 0;
1038 }
1039 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1040
1041 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1042 {
1043         iscsit_set_dataout_sequence_values(cmd);
1044
1045         spin_lock_bh(&cmd->dataout_timeout_lock);
1046         iscsit_start_dataout_timer(cmd, cmd->conn);
1047         spin_unlock_bh(&cmd->dataout_timeout_lock);
1048 }
1049 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1050
1051 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1052                             struct iscsi_scsi_req *hdr)
1053 {
1054         int cmdsn_ret = 0;
1055         /*
1056          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1057          * the Immediate Bit is not set, and no Immediate
1058          * Data is attached.
1059          *
1060          * A PDU/CmdSN carrying Immediate Data can only
1061          * be processed after the DataCRC has passed.
1062          * If the DataCRC fails, the CmdSN MUST NOT
1063          * be acknowledged. (See below)
1064          */
1065         if (!cmd->immediate_data) {
1066                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1067                                         (unsigned char *)hdr, hdr->cmdsn);
1068                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1069                         return -1;
1070                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1071                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1072                         return 0;
1073                 }
1074         }
1075
1076         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1077
1078         /*
1079          * If no Immediate Data is attached, it's OK to return now.
1080          */
1081         if (!cmd->immediate_data) {
1082                 if (!cmd->sense_reason && cmd->unsolicited_data)
1083                         iscsit_set_unsoliticed_dataout(cmd);
1084                 if (!cmd->sense_reason)
1085                         return 0;
1086
1087                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1088                 return 0;
1089         }
1090
1091         /*
1092          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1093          * execution.  These exceptions are processed in CmdSN order using
1094          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1095          */
1096         if (cmd->sense_reason) {
1097                 if (cmd->reject_reason)
1098                         return 0;
1099
1100                 return 1;
1101         }
1102         /*
1103          * Call directly into transport_generic_new_cmd() to perform
1104          * the backend memory allocation.
1105          */
1106         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1107         if (cmd->sense_reason)
1108                 return 1;
1109
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1113
1114 static int
1115 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1116                           bool dump_payload)
1117 {
1118         struct iscsi_conn *conn = cmd->conn;
1119         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1120         /*
1121          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1122          */
1123         if (dump_payload)
1124                 goto after_immediate_data;
1125
1126         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1127                                         cmd->first_burst_len);
1128 after_immediate_data:
1129         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1130                 /*
1131                  * A PDU/CmdSN carrying Immediate Data passed
1132                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1133                  * Immediate Bit is not set.
1134                  */
1135                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1136                                         (unsigned char *)hdr, hdr->cmdsn);
1137                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1138                         return -1;
1139
1140                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1141                         int rc;
1142
1143                         rc = iscsit_dump_data_payload(cmd->conn,
1144                                                       cmd->first_burst_len, 1);
1145                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1146                         return rc;
1147                 } else if (cmd->unsolicited_data)
1148                         iscsit_set_unsoliticed_dataout(cmd);
1149
1150         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1151                 /*
1152                  * Immediate Data failed DataCRC and ERL>=1,
1153                  * silently drop this PDU and let the initiator
1154                  * plug the CmdSN gap.
1155                  *
1156                  * FIXME: Send Unsolicited NOPIN with reserved
1157                  * TTT here to help the initiator figure out
1158                  * the missing CmdSN, although they should be
1159                  * intelligent enough to determine the missing
1160                  * CmdSN and issue a retry to plug the sequence.
1161                  */
1162                 cmd->i_state = ISTATE_REMOVE;
1163                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1164         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1165                 return -1;
1166
1167         return 0;
1168 }
1169
1170 static int
1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1172                            unsigned char *buf)
1173 {
1174         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1175         int rc, immed_data;
1176         bool dump_payload = false;
1177
1178         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1179         if (rc < 0)
1180                 return 0;
1181         /*
1182          * Allocation iovecs needed for struct socket operations for
1183          * traditional iSCSI block I/O.
1184          */
1185         if (iscsit_allocate_iovecs(cmd) < 0) {
1186                 return iscsit_reject_cmd(cmd,
1187                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1188         }
1189         immed_data = cmd->immediate_data;
1190
1191         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1192         if (rc < 0)
1193                 return rc;
1194         else if (rc > 0)
1195                 dump_payload = true;
1196
1197         if (!immed_data)
1198                 return 0;
1199
1200         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1201 }
1202
1203 static u32 iscsit_do_crypto_hash_sg(
1204         struct hash_desc *hash,
1205         struct iscsi_cmd *cmd,
1206         u32 data_offset,
1207         u32 data_length,
1208         u32 padding,
1209         u8 *pad_bytes)
1210 {
1211         u32 data_crc;
1212         u32 i;
1213         struct scatterlist *sg;
1214         unsigned int page_off;
1215
1216         crypto_hash_init(hash);
1217
1218         sg = cmd->first_data_sg;
1219         page_off = cmd->first_data_sg_off;
1220
1221         i = 0;
1222         while (data_length) {
1223                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1224
1225                 crypto_hash_update(hash, &sg[i], cur_len);
1226
1227                 data_length -= cur_len;
1228                 page_off = 0;
1229                 i++;
1230         }
1231
1232         if (padding) {
1233                 struct scatterlist pad_sg;
1234
1235                 sg_init_one(&pad_sg, pad_bytes, padding);
1236                 crypto_hash_update(hash, &pad_sg, padding);
1237         }
1238         crypto_hash_final(hash, (u8 *) &data_crc);
1239
1240         return data_crc;
1241 }
1242
1243 static void iscsit_do_crypto_hash_buf(
1244         struct hash_desc *hash,
1245         const void *buf,
1246         u32 payload_length,
1247         u32 padding,
1248         u8 *pad_bytes,
1249         u8 *data_crc)
1250 {
1251         struct scatterlist sg;
1252
1253         crypto_hash_init(hash);
1254
1255         sg_init_one(&sg, buf, payload_length);
1256         crypto_hash_update(hash, &sg, payload_length);
1257
1258         if (padding) {
1259                 sg_init_one(&sg, pad_bytes, padding);
1260                 crypto_hash_update(hash, &sg, padding);
1261         }
1262         crypto_hash_final(hash, data_crc);
1263 }
1264
1265 int
1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1267                           struct iscsi_cmd **out_cmd)
1268 {
1269         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1270         struct iscsi_cmd *cmd = NULL;
1271         struct se_cmd *se_cmd;
1272         u32 payload_length = ntoh24(hdr->dlength);
1273         int rc;
1274
1275         if (!payload_length) {
1276                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1277                 return 0;
1278         }
1279
1280         /* iSCSI write */
1281         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1282
1283         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1284                 pr_err("DataSegmentLength: %u is greater than"
1285                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1286                         conn->conn_ops->MaxXmitDataSegmentLength);
1287                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1288                                          buf);
1289         }
1290
1291         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1292                         payload_length);
1293         if (!cmd)
1294                 return 0;
1295
1296         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1297                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1298                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1299                 payload_length, conn->cid);
1300
1301         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1302                 pr_err("Command ITT: 0x%08x received DataOUT after"
1303                         " last DataOUT received, dumping payload\n",
1304                         cmd->init_task_tag);
1305                 return iscsit_dump_data_payload(conn, payload_length, 1);
1306         }
1307
1308         if (cmd->data_direction != DMA_TO_DEVICE) {
1309                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1310                         " NON-WRITE command.\n", cmd->init_task_tag);
1311                 return iscsit_dump_data_payload(conn, payload_length, 1);
1312         }
1313         se_cmd = &cmd->se_cmd;
1314         iscsit_mod_dataout_timer(cmd);
1315
1316         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1317                 pr_err("DataOut Offset: %u, Length %u greater than"
1318                         " iSCSI Command EDTL %u, protocol error.\n",
1319                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1320                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1321         }
1322
1323         if (cmd->unsolicited_data) {
1324                 int dump_unsolicited_data = 0;
1325
1326                 if (conn->sess->sess_ops->InitialR2T) {
1327                         pr_err("Received unexpected unsolicited data"
1328                                 " while InitialR2T=Yes, protocol error.\n");
1329                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1330                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1331                         return -1;
1332                 }
1333                 /*
1334                  * Special case for dealing with Unsolicited DataOUT
1335                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1336                  * failures;
1337                  */
1338
1339                 /* Something's amiss if we're not in WRITE_PENDING state... */
1340                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1341                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1342                         dump_unsolicited_data = 1;
1343
1344                 if (dump_unsolicited_data) {
1345                         /*
1346                          * Check if a delayed TASK_ABORTED status needs to
1347                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1348                          * received with the unsolicitied data out.
1349                          */
1350                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1351                                 iscsit_stop_dataout_timer(cmd);
1352
1353                         transport_check_aborted_status(se_cmd,
1354                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1355                         return iscsit_dump_data_payload(conn, payload_length, 1);
1356                 }
1357         } else {
1358                 /*
1359                  * For the normal solicited data path:
1360                  *
1361                  * Check for a delayed TASK_ABORTED status and dump any
1362                  * incoming data out payload if one exists.  Also, when the
1363                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1364                  * data out sequence, we decrement outstanding_r2ts.  Once
1365                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1366                  * TASK_ABORTED status.
1367                  */
1368                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1369                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1370                                 if (--cmd->outstanding_r2ts < 1) {
1371                                         iscsit_stop_dataout_timer(cmd);
1372                                         transport_check_aborted_status(
1373                                                         se_cmd, 1);
1374                                 }
1375
1376                         return iscsit_dump_data_payload(conn, payload_length, 1);
1377                 }
1378         }
1379         /*
1380          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1381          * within-command recovery checks before receiving the payload.
1382          */
1383         rc = iscsit_check_pre_dataout(cmd, buf);
1384         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1385                 return 0;
1386         else if (rc == DATAOUT_CANNOT_RECOVER)
1387                 return -1;
1388
1389         *out_cmd = cmd;
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1393
1394 static int
1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1396                    struct iscsi_data *hdr)
1397 {
1398         struct kvec *iov;
1399         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1400         u32 payload_length = ntoh24(hdr->dlength);
1401         int iov_ret, data_crc_failed = 0;
1402
1403         rx_size += payload_length;
1404         iov = &cmd->iov_data[0];
1405
1406         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1407                                    payload_length);
1408         if (iov_ret < 0)
1409                 return -1;
1410
1411         iov_count += iov_ret;
1412
1413         padding = ((-payload_length) & 3);
1414         if (padding != 0) {
1415                 iov[iov_count].iov_base = cmd->pad_bytes;
1416                 iov[iov_count++].iov_len = padding;
1417                 rx_size += padding;
1418                 pr_debug("Receiving %u padding bytes.\n", padding);
1419         }
1420
1421         if (conn->conn_ops->DataDigest) {
1422                 iov[iov_count].iov_base = &checksum;
1423                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1424                 rx_size += ISCSI_CRC_LEN;
1425         }
1426
1427         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1428
1429         iscsit_unmap_iovec(cmd);
1430
1431         if (rx_got != rx_size)
1432                 return -1;
1433
1434         if (conn->conn_ops->DataDigest) {
1435                 u32 data_crc;
1436
1437                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1438                                                     be32_to_cpu(hdr->offset),
1439                                                     payload_length, padding,
1440                                                     cmd->pad_bytes);
1441
1442                 if (checksum != data_crc) {
1443                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1444                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1445                                 " does not match computed 0x%08x\n",
1446                                 hdr->itt, hdr->offset, payload_length,
1447                                 hdr->datasn, checksum, data_crc);
1448                         data_crc_failed = 1;
1449                 } else {
1450                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1451                                 " %u bytes of Data Out\n", checksum,
1452                                 payload_length);
1453                 }
1454         }
1455
1456         return data_crc_failed;
1457 }
1458
1459 int
1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1461                              bool data_crc_failed)
1462 {
1463         struct iscsi_conn *conn = cmd->conn;
1464         int rc, ooo_cmdsn;
1465         /*
1466          * Increment post receive data and CRC values or perform
1467          * within-command recovery.
1468          */
1469         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1470         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1471                 return 0;
1472         else if (rc == DATAOUT_SEND_R2T) {
1473                 iscsit_set_dataout_sequence_values(cmd);
1474                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1475         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1476                 /*
1477                  * Handle extra special case for out of order
1478                  * Unsolicited Data Out.
1479                  */
1480                 spin_lock_bh(&cmd->istate_lock);
1481                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1482                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1483                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1484                 spin_unlock_bh(&cmd->istate_lock);
1485
1486                 iscsit_stop_dataout_timer(cmd);
1487                 if (ooo_cmdsn)
1488                         return 0;
1489                 target_execute_cmd(&cmd->se_cmd);
1490                 return 0;
1491         } else /* DATAOUT_CANNOT_RECOVER */
1492                 return -1;
1493
1494         return 0;
1495 }
1496 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1497
1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1499 {
1500         struct iscsi_cmd *cmd = NULL;
1501         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1502         int rc;
1503         bool data_crc_failed = false;
1504
1505         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1506         if (rc < 0)
1507                 return 0;
1508         else if (!cmd)
1509                 return 0;
1510
1511         rc = iscsit_get_dataout(conn, cmd, hdr);
1512         if (rc < 0)
1513                 return rc;
1514         else if (rc > 0)
1515                 data_crc_failed = true;
1516
1517         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1518 }
1519
1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1521                          struct iscsi_nopout *hdr)
1522 {
1523         u32 payload_length = ntoh24(hdr->dlength);
1524
1525         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1526                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1527                 if (!cmd)
1528                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1529                                                  (unsigned char *)hdr);
1530
1531                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1532                                          (unsigned char *)hdr);
1533         }
1534
1535         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1536                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1537                         " not set, protocol error.\n");
1538                 if (!cmd)
1539                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540                                                  (unsigned char *)hdr);
1541
1542                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543                                          (unsigned char *)hdr);
1544         }
1545
1546         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1548                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1549                         " error.\n", payload_length,
1550                         conn->conn_ops->MaxXmitDataSegmentLength);
1551                 if (!cmd)
1552                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1553                                                  (unsigned char *)hdr);
1554
1555                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1556                                          (unsigned char *)hdr);
1557         }
1558
1559         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1560                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1561                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1562                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1563                 payload_length);
1564         /*
1565          * This is not a response to a Unsolicited NopIN, which means
1566          * it can either be a NOPOUT ping request (with a valid ITT),
1567          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568          * Either way, make sure we allocate an struct iscsi_cmd, as both
1569          * can contain ping data.
1570          */
1571         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1572                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1573                 cmd->i_state            = ISTATE_SEND_NOPIN;
1574                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575                                                 1 : 0);
1576                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1578                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1579                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1580                 cmd->data_direction     = DMA_NONE;
1581         }
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL(iscsit_setup_nop_out);
1586
1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588                            struct iscsi_nopout *hdr)
1589 {
1590         struct iscsi_cmd *cmd_p = NULL;
1591         int cmdsn_ret = 0;
1592         /*
1593          * Initiator is expecting a NopIN ping reply..
1594          */
1595         if (hdr->itt != RESERVED_ITT) {
1596                 if (!cmd)
1597                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1598                                                 (unsigned char *)hdr);
1599
1600                 spin_lock_bh(&conn->cmd_lock);
1601                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1602                 spin_unlock_bh(&conn->cmd_lock);
1603
1604                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1605
1606                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1607                         iscsit_add_cmd_to_response_queue(cmd, conn,
1608                                                          cmd->i_state);
1609                         return 0;
1610                 }
1611
1612                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1613                                 (unsigned char *)hdr, hdr->cmdsn);
1614                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1615                         return 0;
1616                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1617                         return -1;
1618
1619                 return 0;
1620         }
1621         /*
1622          * This was a response to a unsolicited NOPIN ping.
1623          */
1624         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1625                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1626                 if (!cmd_p)
1627                         return -EINVAL;
1628
1629                 iscsit_stop_nopin_response_timer(conn);
1630
1631                 cmd_p->i_state = ISTATE_REMOVE;
1632                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1633
1634                 iscsit_start_nopin_timer(conn);
1635                 return 0;
1636         }
1637         /*
1638          * Otherwise, initiator is not expecting a NOPIN is response.
1639          * Just ignore for now.
1640          */
1641         return 0;
1642 }
1643 EXPORT_SYMBOL(iscsit_process_nop_out);
1644
1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1646                                  unsigned char *buf)
1647 {
1648         unsigned char *ping_data = NULL;
1649         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1650         struct kvec *iov = NULL;
1651         u32 payload_length = ntoh24(hdr->dlength);
1652         int ret;
1653
1654         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1655         if (ret < 0)
1656                 return 0;
1657         /*
1658          * Handle NOP-OUT payload for traditional iSCSI sockets
1659          */
1660         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1661                 u32 checksum, data_crc, padding = 0;
1662                 int niov = 0, rx_got, rx_size = payload_length;
1663
1664                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1665                 if (!ping_data) {
1666                         pr_err("Unable to allocate memory for"
1667                                 " NOPOUT ping data.\n");
1668                         ret = -1;
1669                         goto out;
1670                 }
1671
1672                 iov = &cmd->iov_misc[0];
1673                 iov[niov].iov_base      = ping_data;
1674                 iov[niov++].iov_len     = payload_length;
1675
1676                 padding = ((-payload_length) & 3);
1677                 if (padding != 0) {
1678                         pr_debug("Receiving %u additional bytes"
1679                                 " for padding.\n", padding);
1680                         iov[niov].iov_base      = &cmd->pad_bytes;
1681                         iov[niov++].iov_len     = padding;
1682                         rx_size += padding;
1683                 }
1684                 if (conn->conn_ops->DataDigest) {
1685                         iov[niov].iov_base      = &checksum;
1686                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1687                         rx_size += ISCSI_CRC_LEN;
1688                 }
1689
1690                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1691                 if (rx_got != rx_size) {
1692                         ret = -1;
1693                         goto out;
1694                 }
1695
1696                 if (conn->conn_ops->DataDigest) {
1697                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1698                                         ping_data, payload_length,
1699                                         padding, cmd->pad_bytes,
1700                                         (u8 *)&data_crc);
1701
1702                         if (checksum != data_crc) {
1703                                 pr_err("Ping data CRC32C DataDigest"
1704                                 " 0x%08x does not match computed 0x%08x\n",
1705                                         checksum, data_crc);
1706                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1707                                         pr_err("Unable to recover from"
1708                                         " NOPOUT Ping DataCRC failure while in"
1709                                                 " ERL=0.\n");
1710                                         ret = -1;
1711                                         goto out;
1712                                 } else {
1713                                         /*
1714                                          * Silently drop this PDU and let the
1715                                          * initiator plug the CmdSN gap.
1716                                          */
1717                                         pr_debug("Dropping NOPOUT"
1718                                         " Command CmdSN: 0x%08x due to"
1719                                         " DataCRC error.\n", hdr->cmdsn);
1720                                         ret = 0;
1721                                         goto out;
1722                                 }
1723                         } else {
1724                                 pr_debug("Got CRC32C DataDigest"
1725                                 " 0x%08x for %u bytes of ping data.\n",
1726                                         checksum, payload_length);
1727                         }
1728                 }
1729
1730                 ping_data[payload_length] = '\0';
1731                 /*
1732                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1733                  */
1734                 cmd->buf_ptr = ping_data;
1735                 cmd->buf_ptr_size = payload_length;
1736
1737                 pr_debug("Got %u bytes of NOPOUT ping"
1738                         " data.\n", payload_length);
1739                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1740         }
1741
1742         return iscsit_process_nop_out(conn, cmd, hdr);
1743 out:
1744         if (cmd)
1745                 iscsit_free_cmd(cmd, false);
1746
1747         kfree(ping_data);
1748         return ret;
1749 }
1750
1751 int
1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753                            unsigned char *buf)
1754 {
1755         struct se_tmr_req *se_tmr;
1756         struct iscsi_tmr_req *tmr_req;
1757         struct iscsi_tm *hdr;
1758         int out_of_order_cmdsn = 0, ret;
1759         bool sess_ref = false;
1760         u8 function;
1761
1762         hdr                     = (struct iscsi_tm *) buf;
1763         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1764         function = hdr->flags;
1765
1766         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1767                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1768                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1769                 hdr->rtt, hdr->refcmdsn, conn->cid);
1770
1771         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773              hdr->rtt != RESERVED_ITT)) {
1774                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1775                 hdr->rtt = RESERVED_ITT;
1776         }
1777
1778         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1779                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1780                 pr_err("Task Management Request TASK_REASSIGN not"
1781                         " issued as immediate command, bad iSCSI Initiator"
1782                                 "implementation\n");
1783                 return iscsit_add_reject_cmd(cmd,
1784                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1785         }
1786         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1787             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1788                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1789
1790         cmd->data_direction = DMA_NONE;
1791
1792         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1793         if (!cmd->tmr_req) {
1794                 pr_err("Unable to allocate memory for"
1795                         " Task Management command!\n");
1796                 return iscsit_add_reject_cmd(cmd,
1797                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1798                                              buf);
1799         }
1800
1801         /*
1802          * TASK_REASSIGN for ERL=2 / connection stays inside of
1803          * LIO-Target $FABRIC_MOD
1804          */
1805         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1806
1807                 u8 tcm_function;
1808                 int ret;
1809
1810                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1811                                       conn->sess->se_sess, 0, DMA_NONE,
1812                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1813
1814                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1815                 sess_ref = true;
1816
1817                 switch (function) {
1818                 case ISCSI_TM_FUNC_ABORT_TASK:
1819                         tcm_function = TMR_ABORT_TASK;
1820                         break;
1821                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1822                         tcm_function = TMR_ABORT_TASK_SET;
1823                         break;
1824                 case ISCSI_TM_FUNC_CLEAR_ACA:
1825                         tcm_function = TMR_CLEAR_ACA;
1826                         break;
1827                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1828                         tcm_function = TMR_CLEAR_TASK_SET;
1829                         break;
1830                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1831                         tcm_function = TMR_LUN_RESET;
1832                         break;
1833                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1834                         tcm_function = TMR_TARGET_WARM_RESET;
1835                         break;
1836                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1837                         tcm_function = TMR_TARGET_COLD_RESET;
1838                         break;
1839                 default:
1840                         pr_err("Unknown iSCSI TMR Function:"
1841                                " 0x%02x\n", function);
1842                         return iscsit_add_reject_cmd(cmd,
1843                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1844                 }
1845
1846                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1847                                          tcm_function, GFP_KERNEL);
1848                 if (ret < 0)
1849                         return iscsit_add_reject_cmd(cmd,
1850                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1851
1852                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1853         }
1854
1855         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1856         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1857         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1858         cmd->init_task_tag      = hdr->itt;
1859         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1860         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1861         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1862         se_tmr                  = cmd->se_cmd.se_tmr_req;
1863         tmr_req                 = cmd->tmr_req;
1864         /*
1865          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1866          */
1867         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1868                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1869                                                scsilun_to_int(&hdr->lun));
1870                 if (ret < 0) {
1871                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1872                         goto attach;
1873                 }
1874         }
1875
1876         switch (function) {
1877         case ISCSI_TM_FUNC_ABORT_TASK:
1878                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1879                 if (se_tmr->response)
1880                         goto attach;
1881                 break;
1882         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1883         case ISCSI_TM_FUNC_CLEAR_ACA:
1884         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1885         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1886                 break;
1887         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1888                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1889                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1890                         goto attach;
1891                 }
1892                 break;
1893         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1894                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1895                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1896                         goto attach;
1897                 }
1898                 break;
1899         case ISCSI_TM_FUNC_TASK_REASSIGN:
1900                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1901                 /*
1902                  * Perform sanity checks on the ExpDataSN only if the
1903                  * TASK_REASSIGN was successful.
1904                  */
1905                 if (se_tmr->response)
1906                         break;
1907
1908                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1909                         return iscsit_add_reject_cmd(cmd,
1910                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1911                 break;
1912         default:
1913                 pr_err("Unknown TMR function: 0x%02x, protocol"
1914                         " error.\n", function);
1915                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1916                 goto attach;
1917         }
1918
1919         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1920             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1921                 se_tmr->call_transport = 1;
1922 attach:
1923         spin_lock_bh(&conn->cmd_lock);
1924         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1925         spin_unlock_bh(&conn->cmd_lock);
1926
1927         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1928                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1929                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1930                         out_of_order_cmdsn = 1;
1931                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1932                         return 0;
1933                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1934                         return -1;
1935         }
1936         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1937
1938         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1939                 return 0;
1940         /*
1941          * Found the referenced task, send to transport for processing.
1942          */
1943         if (se_tmr->call_transport)
1944                 return transport_generic_handle_tmr(&cmd->se_cmd);
1945
1946         /*
1947          * Could not find the referenced LUN, task, or Task Management
1948          * command not authorized or supported.  Change state and
1949          * let the tx_thread send the response.
1950          *
1951          * For connection recovery, this is also the default action for
1952          * TMR TASK_REASSIGN.
1953          */
1954         if (sess_ref) {
1955                 pr_debug("Handle TMR, using sess_ref=true check\n");
1956                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1957         }
1958
1959         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1960         return 0;
1961 }
1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1963
1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 int
1966 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1967                       struct iscsi_text *hdr)
1968 {
1969         u32 payload_length = ntoh24(hdr->dlength);
1970
1971         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1972                 pr_err("Unable to accept text parameter length: %u"
1973                         "greater than MaxXmitDataSegmentLength %u.\n",
1974                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1975                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1976                                          (unsigned char *)hdr);
1977         }
1978
1979         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1980              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1981                 pr_err("Multi sequence text commands currently not supported\n");
1982                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1983                                         (unsigned char *)hdr);
1984         }
1985
1986         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1987                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1988                 hdr->exp_statsn, payload_length);
1989
1990         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1991         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1992         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1993         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1994         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1995         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1996         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1997         cmd->data_direction     = DMA_NONE;
1998         cmd->text_in_ptr        = NULL;
1999
2000         return 0;
2001 }
2002 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2003
2004 int
2005 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2006                         struct iscsi_text *hdr)
2007 {
2008         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2009         int cmdsn_ret;
2010
2011         if (!text_in) {
2012                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2013                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2014                         pr_err("Unable to locate text_in buffer for sendtargets"
2015                                " discovery\n");
2016                         goto reject;
2017                 }
2018                 goto empty_sendtargets;
2019         }
2020         if (strncmp("SendTargets", text_in, 11) != 0) {
2021                 pr_err("Received Text Data that is not"
2022                         " SendTargets, cannot continue.\n");
2023                 goto reject;
2024         }
2025         text_ptr = strchr(text_in, '=');
2026         if (!text_ptr) {
2027                 pr_err("No \"=\" separator found in Text Data,"
2028                         "  cannot continue.\n");
2029                 goto reject;
2030         }
2031         if (!strncmp("=All", text_ptr, 4)) {
2032                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2033         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2034                    !strncmp("=eui.", text_ptr, 5)) {
2035                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2036         } else {
2037                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2038                 goto reject;
2039         }
2040
2041         spin_lock_bh(&conn->cmd_lock);
2042         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2043         spin_unlock_bh(&conn->cmd_lock);
2044
2045 empty_sendtargets:
2046         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2047
2048         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2049                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2050                                 (unsigned char *)hdr, hdr->cmdsn);
2051                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2052                         return -1;
2053
2054                 return 0;
2055         }
2056
2057         return iscsit_execute_cmd(cmd, 0);
2058
2059 reject:
2060         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2061                                  (unsigned char *)hdr);
2062 }
2063 EXPORT_SYMBOL(iscsit_process_text_cmd);
2064
2065 static int
2066 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2067                        unsigned char *buf)
2068 {
2069         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2070         char *text_in = NULL;
2071         u32 payload_length = ntoh24(hdr->dlength);
2072         int rx_size, rc;
2073
2074         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2075         if (rc < 0)
2076                 return 0;
2077
2078         rx_size = payload_length;
2079         if (payload_length) {
2080                 u32 checksum = 0, data_crc = 0;
2081                 u32 padding = 0, pad_bytes = 0;
2082                 int niov = 0, rx_got;
2083                 struct kvec iov[3];
2084
2085                 text_in = kzalloc(payload_length, GFP_KERNEL);
2086                 if (!text_in) {
2087                         pr_err("Unable to allocate memory for"
2088                                 " incoming text parameters\n");
2089                         goto reject;
2090                 }
2091                 cmd->text_in_ptr = text_in;
2092
2093                 memset(iov, 0, 3 * sizeof(struct kvec));
2094                 iov[niov].iov_base      = text_in;
2095                 iov[niov++].iov_len     = payload_length;
2096
2097                 padding = ((-payload_length) & 3);
2098                 if (padding != 0) {
2099                         iov[niov].iov_base = &pad_bytes;
2100                         iov[niov++].iov_len  = padding;
2101                         rx_size += padding;
2102                         pr_debug("Receiving %u additional bytes"
2103                                         " for padding.\n", padding);
2104                 }
2105                 if (conn->conn_ops->DataDigest) {
2106                         iov[niov].iov_base      = &checksum;
2107                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2108                         rx_size += ISCSI_CRC_LEN;
2109                 }
2110
2111                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2112                 if (rx_got != rx_size)
2113                         goto reject;
2114
2115                 if (conn->conn_ops->DataDigest) {
2116                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2117                                         text_in, payload_length,
2118                                         padding, (u8 *)&pad_bytes,
2119                                         (u8 *)&data_crc);
2120
2121                         if (checksum != data_crc) {
2122                                 pr_err("Text data CRC32C DataDigest"
2123                                         " 0x%08x does not match computed"
2124                                         " 0x%08x\n", checksum, data_crc);
2125                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2126                                         pr_err("Unable to recover from"
2127                                         " Text Data digest failure while in"
2128                                                 " ERL=0.\n");
2129                                         goto reject;
2130                                 } else {
2131                                         /*
2132                                          * Silently drop this PDU and let the
2133                                          * initiator plug the CmdSN gap.
2134                                          */
2135                                         pr_debug("Dropping Text"
2136                                         " Command CmdSN: 0x%08x due to"
2137                                         " DataCRC error.\n", hdr->cmdsn);
2138                                         kfree(text_in);
2139                                         return 0;
2140                                 }
2141                         } else {
2142                                 pr_debug("Got CRC32C DataDigest"
2143                                         " 0x%08x for %u bytes of text data.\n",
2144                                                 checksum, payload_length);
2145                         }
2146                 }
2147                 text_in[payload_length - 1] = '\0';
2148                 pr_debug("Successfully read %d bytes of text"
2149                                 " data.\n", payload_length);
2150         }
2151
2152         return iscsit_process_text_cmd(conn, cmd, hdr);
2153
2154 reject:
2155         kfree(cmd->text_in_ptr);
2156         cmd->text_in_ptr = NULL;
2157         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2158 }
2159
2160 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2161 {
2162         struct iscsi_conn *conn_p;
2163         struct iscsi_session *sess = conn->sess;
2164
2165         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2166                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2167
2168         atomic_set(&sess->session_logout, 1);
2169         atomic_set(&conn->conn_logout_remove, 1);
2170         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2171
2172         iscsit_inc_conn_usage_count(conn);
2173         iscsit_inc_session_usage_count(sess);
2174
2175         spin_lock_bh(&sess->conn_lock);
2176         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2177                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2178                         continue;
2179
2180                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2182         }
2183         spin_unlock_bh(&sess->conn_lock);
2184
2185         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2186
2187         return 0;
2188 }
2189
2190 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191 {
2192         struct iscsi_conn *l_conn;
2193         struct iscsi_session *sess = conn->sess;
2194
2195         pr_debug("Received logout request CLOSECONNECTION for CID:"
2196                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2197
2198         /*
2199          * A Logout Request with a CLOSECONNECTION reason code for a CID
2200          * can arrive on a connection with a differing CID.
2201          */
2202         if (conn->cid == cmd->logout_cid) {
2203                 spin_lock_bh(&conn->state_lock);
2204                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2205                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2206
2207                 atomic_set(&conn->conn_logout_remove, 1);
2208                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2209                 iscsit_inc_conn_usage_count(conn);
2210
2211                 spin_unlock_bh(&conn->state_lock);
2212         } else {
2213                 /*
2214                  * Handle all different cid CLOSECONNECTION requests in
2215                  * iscsit_logout_post_handler_diffcid() as to give enough
2216                  * time for any non immediate command's CmdSN to be
2217                  * acknowledged on the connection in question.
2218                  *
2219                  * Here we simply make sure the CID is still around.
2220                  */
2221                 l_conn = iscsit_get_conn_from_cid(sess,
2222                                 cmd->logout_cid);
2223                 if (!l_conn) {
2224                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2225                         iscsit_add_cmd_to_response_queue(cmd, conn,
2226                                         cmd->i_state);
2227                         return 0;
2228                 }
2229
2230                 iscsit_dec_conn_usage_count(l_conn);
2231         }
2232
2233         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234
2235         return 0;
2236 }
2237
2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2239 {
2240         struct iscsi_session *sess = conn->sess;
2241
2242         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2243                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2244
2245         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2246                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247                         " while ERL!=2.\n");
2248                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2249                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2250                 return 0;
2251         }
2252
2253         if (conn->cid == cmd->logout_cid) {
2254                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2255                         " with CID: %hu on CID: %hu, implementation error.\n",
2256                                 cmd->logout_cid, conn->cid);
2257                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2258                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2259                 return 0;
2260         }
2261
2262         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2263
2264         return 0;
2265 }
2266
2267 int
2268 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2269                         unsigned char *buf)
2270 {
2271         int cmdsn_ret, logout_remove = 0;
2272         u8 reason_code = 0;
2273         struct iscsi_logout *hdr;
2274         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2275
2276         hdr                     = (struct iscsi_logout *) buf;
2277         reason_code             = (hdr->flags & 0x7f);
2278
2279         if (tiqn) {
2280                 spin_lock(&tiqn->logout_stats.lock);
2281                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2282                         tiqn->logout_stats.normal_logouts++;
2283                 else
2284                         tiqn->logout_stats.abnormal_logouts++;
2285                 spin_unlock(&tiqn->logout_stats.lock);
2286         }
2287
2288         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2289                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2290                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2291                 hdr->cid, conn->cid);
2292
2293         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2294                 pr_err("Received logout request on connection that"
2295                         " is not in logged in state, ignoring request.\n");
2296                 iscsit_free_cmd(cmd, false);
2297                 return 0;
2298         }
2299
2300         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2301         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2302         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2303         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2304         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2305         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2306         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2307         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2308         cmd->logout_reason      = reason_code;
2309         cmd->data_direction     = DMA_NONE;
2310
2311         /*
2312          * We need to sleep in these cases (by returning 1) until the Logout
2313          * Response gets sent in the tx thread.
2314          */
2315         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2316            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2317             be16_to_cpu(hdr->cid) == conn->cid))
2318                 logout_remove = 1;
2319
2320         spin_lock_bh(&conn->cmd_lock);
2321         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2322         spin_unlock_bh(&conn->cmd_lock);
2323
2324         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2325                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2326
2327         /*
2328          * Immediate commands are executed, well, immediately.
2329          * Non-Immediate Logout Commands are executed in CmdSN order.
2330          */
2331         if (cmd->immediate_cmd) {
2332                 int ret = iscsit_execute_cmd(cmd, 0);
2333
2334                 if (ret < 0)
2335                         return ret;
2336         } else {
2337                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2338                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2339                         logout_remove = 0;
2340                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2341                         return -1;
2342         }
2343
2344         return logout_remove;
2345 }
2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2347
2348 static int iscsit_handle_snack(
2349         struct iscsi_conn *conn,
2350         unsigned char *buf)
2351 {
2352         struct iscsi_snack *hdr;
2353
2354         hdr                     = (struct iscsi_snack *) buf;
2355         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2356
2357         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2358                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2359                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2360                         hdr->begrun, hdr->runlength, conn->cid);
2361
2362         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2363                 pr_err("Initiator sent SNACK request while in"
2364                         " ErrorRecoveryLevel=0.\n");
2365                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2366                                          buf);
2367         }
2368         /*
2369          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2370          * call from inside iscsi_send_recovery_datain_or_r2t().
2371          */
2372         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2373         case 0:
2374                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2375                         hdr->itt,
2376                         be32_to_cpu(hdr->ttt),
2377                         be32_to_cpu(hdr->begrun),
2378                         be32_to_cpu(hdr->runlength));
2379         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2380                 return iscsit_handle_status_snack(conn, hdr->itt,
2381                         be32_to_cpu(hdr->ttt),
2382                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2383         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2384                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2385                         be32_to_cpu(hdr->begrun),
2386                         be32_to_cpu(hdr->runlength));
2387         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2388                 /* FIXME: Support R-Data SNACK */
2389                 pr_err("R-Data SNACK Not Supported.\n");
2390                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2391                                          buf);
2392         default:
2393                 pr_err("Unknown SNACK type 0x%02x, protocol"
2394                         " error.\n", hdr->flags & 0x0f);
2395                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2396                                          buf);
2397         }
2398
2399         return 0;
2400 }
2401
2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2403 {
2404         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2405             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2406                 wait_for_completion_interruptible_timeout(
2407                                         &conn->rx_half_close_comp,
2408                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2409         }
2410 }
2411
2412 static int iscsit_handle_immediate_data(
2413         struct iscsi_cmd *cmd,
2414         struct iscsi_scsi_req *hdr,
2415         u32 length)
2416 {
2417         int iov_ret, rx_got = 0, rx_size = 0;
2418         u32 checksum, iov_count = 0, padding = 0;
2419         struct iscsi_conn *conn = cmd->conn;
2420         struct kvec *iov;
2421
2422         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2423         if (iov_ret < 0)
2424                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2425
2426         rx_size = length;
2427         iov_count = iov_ret;
2428         iov = &cmd->iov_data[0];
2429
2430         padding = ((-length) & 3);
2431         if (padding != 0) {
2432                 iov[iov_count].iov_base = cmd->pad_bytes;
2433                 iov[iov_count++].iov_len = padding;
2434                 rx_size += padding;
2435         }
2436
2437         if (conn->conn_ops->DataDigest) {
2438                 iov[iov_count].iov_base         = &checksum;
2439                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2440                 rx_size += ISCSI_CRC_LEN;
2441         }
2442
2443         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2444
2445         iscsit_unmap_iovec(cmd);
2446
2447         if (rx_got != rx_size) {
2448                 iscsit_rx_thread_wait_for_tcp(conn);
2449                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2450         }
2451
2452         if (conn->conn_ops->DataDigest) {
2453                 u32 data_crc;
2454
2455                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2456                                                     cmd->write_data_done, length, padding,
2457                                                     cmd->pad_bytes);
2458
2459                 if (checksum != data_crc) {
2460                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2461                                 " does not match computed 0x%08x\n", checksum,
2462                                 data_crc);
2463
2464                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2465                                 pr_err("Unable to recover from"
2466                                         " Immediate Data digest failure while"
2467                                         " in ERL=0.\n");
2468                                 iscsit_reject_cmd(cmd,
2469                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2470                                                 (unsigned char *)hdr);
2471                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2472                         } else {
2473                                 iscsit_reject_cmd(cmd,
2474                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2475                                                 (unsigned char *)hdr);
2476                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2477                         }
2478                 } else {
2479                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2480                                 " %u bytes of Immediate Data\n", checksum,
2481                                 length);
2482                 }
2483         }
2484
2485         cmd->write_data_done += length;
2486
2487         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2488                 spin_lock_bh(&cmd->istate_lock);
2489                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2490                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2491                 spin_unlock_bh(&cmd->istate_lock);
2492         }
2493
2494         return IMMEDIATE_DATA_NORMAL_OPERATION;
2495 }
2496
2497 /*
2498  *      Called with sess->conn_lock held.
2499  */
2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2501         with active network interface */
2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2503 {
2504         struct iscsi_cmd *cmd;
2505         struct iscsi_conn *conn_p;
2506         bool found = false;
2507
2508         /*
2509          * Only send a Asynchronous Message on connections whos network
2510          * interface is still functional.
2511          */
2512         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2513                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2514                         iscsit_inc_conn_usage_count(conn_p);
2515                         found = true;
2516                         break;
2517                 }
2518         }
2519
2520         if (!found)
2521                 return;
2522
2523         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2524         if (!cmd) {
2525                 iscsit_dec_conn_usage_count(conn_p);
2526                 return;
2527         }
2528
2529         cmd->logout_cid = conn->cid;
2530         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2531         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2532
2533         spin_lock_bh(&conn_p->cmd_lock);
2534         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2535         spin_unlock_bh(&conn_p->cmd_lock);
2536
2537         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2538         iscsit_dec_conn_usage_count(conn_p);
2539 }
2540
2541 static int iscsit_send_conn_drop_async_message(
2542         struct iscsi_cmd *cmd,
2543         struct iscsi_conn *conn)
2544 {
2545         struct iscsi_async *hdr;
2546
2547         cmd->tx_size = ISCSI_HDR_LEN;
2548         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2549
2550         hdr                     = (struct iscsi_async *) cmd->pdu;
2551         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2552         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2553         cmd->init_task_tag      = RESERVED_ITT;
2554         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2555         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2556         cmd->stat_sn            = conn->stat_sn++;
2557         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2558         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2559         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2560         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2561         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2562         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2563         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2564
2565         if (conn->conn_ops->HeaderDigest) {
2566                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2567
2568                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2569                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2570
2571                 cmd->tx_size += ISCSI_CRC_LEN;
2572                 pr_debug("Attaching CRC32C HeaderDigest to"
2573                         " Async Message 0x%08x\n", *header_digest);
2574         }
2575
2576         cmd->iov_misc[0].iov_base       = cmd->pdu;
2577         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2578         cmd->iov_misc_count             = 1;
2579
2580         pr_debug("Sending Connection Dropped Async Message StatSN:"
2581                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2582                         cmd->logout_cid, conn->cid);
2583         return 0;
2584 }
2585
2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2587 {
2588         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590                 wait_for_completion_interruptible_timeout(
2591                                         &conn->tx_half_close_comp,
2592                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2593         }
2594 }
2595
2596 static void
2597 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2598                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2599                         bool set_statsn)
2600 {
2601         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2602         hdr->flags              = datain->flags;
2603         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2604                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2605                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2606                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2608                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2609                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2610                 }
2611         }
2612         hton24(hdr->dlength, datain->length);
2613         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2614                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2615                                 (struct scsi_lun *)&hdr->lun);
2616         else
2617                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2618
2619         hdr->itt                = cmd->init_task_tag;
2620
2621         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2622                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2623         else
2624                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2625         if (set_statsn)
2626                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2627         else
2628                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2629
2630         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2631         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2632         hdr->datasn             = cpu_to_be32(datain->data_sn);
2633         hdr->offset             = cpu_to_be32(datain->offset);
2634
2635         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2636                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2637                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2638                 ntohl(hdr->offset), datain->length, conn->cid);
2639 }
2640
2641 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2642 {
2643         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2644         struct iscsi_datain datain;
2645         struct iscsi_datain_req *dr;
2646         struct kvec *iov;
2647         u32 iov_count = 0, tx_size = 0;
2648         int eodr = 0, ret, iov_ret;
2649         bool set_statsn = false;
2650
2651         memset(&datain, 0, sizeof(struct iscsi_datain));
2652         dr = iscsit_get_datain_values(cmd, &datain);
2653         if (!dr) {
2654                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2655                                 cmd->init_task_tag);
2656                 return -1;
2657         }
2658         /*
2659          * Be paranoid and double check the logic for now.
2660          */
2661         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2662                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2663                         " datain.length: %u exceeds cmd->data_length: %u\n",
2664                         cmd->init_task_tag, datain.offset, datain.length,
2665                         cmd->se_cmd.data_length);
2666                 return -1;
2667         }
2668
2669         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2670         /*
2671          * Special case for successfully execution w/ both DATAIN
2672          * and Sense Data.
2673          */
2674         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2675             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2676                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2677         else {
2678                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2679                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2680                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2681                         cmd->stat_sn = conn->stat_sn++;
2682                         set_statsn = true;
2683                 } else if (dr->dr_complete ==
2684                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2685                         set_statsn = true;
2686         }
2687
2688         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2689
2690         iov = &cmd->iov_data[0];
2691         iov[iov_count].iov_base = cmd->pdu;
2692         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2693         tx_size += ISCSI_HDR_LEN;
2694
2695         if (conn->conn_ops->HeaderDigest) {
2696                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2697
2698                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2699                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2700
2701                 iov[0].iov_len += ISCSI_CRC_LEN;
2702                 tx_size += ISCSI_CRC_LEN;
2703
2704                 pr_debug("Attaching CRC32 HeaderDigest"
2705                         " for DataIN PDU 0x%08x\n", *header_digest);
2706         }
2707
2708         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2709                                 datain.offset, datain.length);
2710         if (iov_ret < 0)
2711                 return -1;
2712
2713         iov_count += iov_ret;
2714         tx_size += datain.length;
2715
2716         cmd->padding = ((-datain.length) & 3);
2717         if (cmd->padding) {
2718                 iov[iov_count].iov_base         = cmd->pad_bytes;
2719                 iov[iov_count++].iov_len        = cmd->padding;
2720                 tx_size += cmd->padding;
2721
2722                 pr_debug("Attaching %u padding bytes\n",
2723                                 cmd->padding);
2724         }
2725         if (conn->conn_ops->DataDigest) {
2726                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2727                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2728
2729                 iov[iov_count].iov_base = &cmd->data_crc;
2730                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2731                 tx_size += ISCSI_CRC_LEN;
2732
2733                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2734                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2735         }
2736
2737         cmd->iov_data_count = iov_count;
2738         cmd->tx_size = tx_size;
2739
2740         /* sendpage is preferred but can't insert markers */
2741         if (!conn->conn_ops->IFMarker)
2742                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2743         else
2744                 ret = iscsit_send_tx_data(cmd, conn, 0);
2745
2746         iscsit_unmap_iovec(cmd);
2747
2748         if (ret < 0) {
2749                 iscsit_tx_thread_wait_for_tcp(conn);
2750                 return ret;
2751         }
2752
2753         if (dr->dr_complete) {
2754                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2755                                 2 : 1;
2756                 iscsit_free_datain_req(cmd, dr);
2757         }
2758
2759         return eodr;
2760 }
2761
2762 int
2763 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2764                         struct iscsi_logout_rsp *hdr)
2765 {
2766         struct iscsi_conn *logout_conn = NULL;
2767         struct iscsi_conn_recovery *cr = NULL;
2768         struct iscsi_session *sess = conn->sess;
2769         /*
2770          * The actual shutting down of Sessions and/or Connections
2771          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2772          * is done in scsi_logout_post_handler().
2773          */
2774         switch (cmd->logout_reason) {
2775         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2776                 pr_debug("iSCSI session logout successful, setting"
2777                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2778                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2779                 break;
2780         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2781                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2782                         break;
2783                 /*
2784                  * For CLOSECONNECTION logout requests carrying
2785                  * a matching logout CID -> local CID, the reference
2786                  * for the local CID will have been incremented in
2787                  * iscsi_logout_closeconnection().
2788                  *
2789                  * For CLOSECONNECTION logout requests carrying
2790                  * a different CID than the connection it arrived
2791                  * on, the connection responding to cmd->logout_cid
2792                  * is stopped in iscsit_logout_post_handler_diffcid().
2793                  */
2794
2795                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2796                         " successful.\n", cmd->logout_cid, conn->cid);
2797                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2798                 break;
2799         case ISCSI_LOGOUT_REASON_RECOVERY:
2800                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2801                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2802                         break;
2803                 /*
2804                  * If the connection is still active from our point of view
2805                  * force connection recovery to occur.
2806                  */
2807                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2808                                 cmd->logout_cid);
2809                 if (logout_conn) {
2810                         iscsit_connection_reinstatement_rcfr(logout_conn);
2811                         iscsit_dec_conn_usage_count(logout_conn);
2812                 }
2813
2814                 cr = iscsit_get_inactive_connection_recovery_entry(
2815                                 conn->sess, cmd->logout_cid);
2816                 if (!cr) {
2817                         pr_err("Unable to locate CID: %hu for"
2818                         " REMOVECONNFORRECOVERY Logout Request.\n",
2819                                 cmd->logout_cid);
2820                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2821                         break;
2822                 }
2823
2824                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2825
2826                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2827                         " for recovery for CID: %hu on CID: %hu successful.\n",
2828                                 cmd->logout_cid, conn->cid);
2829                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2830                 break;
2831         default:
2832                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2833                                 cmd->logout_reason);
2834                 return -1;
2835         }
2836
2837         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2838         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2839         hdr->response           = cmd->logout_response;
2840         hdr->itt                = cmd->init_task_tag;
2841         cmd->stat_sn            = conn->stat_sn++;
2842         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2843
2844         iscsit_increment_maxcmdsn(cmd, conn->sess);
2845         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2846         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2847
2848         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2849                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2850                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2851                 cmd->logout_cid, conn->cid);
2852
2853         return 0;
2854 }
2855 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2856
2857 static int
2858 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2859 {
2860         struct kvec *iov;
2861         int niov = 0, tx_size, rc;
2862
2863         rc = iscsit_build_logout_rsp(cmd, conn,
2864                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2865         if (rc < 0)
2866                 return rc;
2867
2868         tx_size = ISCSI_HDR_LEN;
2869         iov = &cmd->iov_misc[0];
2870         iov[niov].iov_base      = cmd->pdu;
2871         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2872
2873         if (conn->conn_ops->HeaderDigest) {
2874                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2875
2876                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2877                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2878
2879                 iov[0].iov_len += ISCSI_CRC_LEN;
2880                 tx_size += ISCSI_CRC_LEN;
2881                 pr_debug("Attaching CRC32C HeaderDigest to"
2882                         " Logout Response 0x%08x\n", *header_digest);
2883         }
2884         cmd->iov_misc_count = niov;
2885         cmd->tx_size = tx_size;
2886
2887         return 0;
2888 }
2889
2890 void
2891 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2892                        struct iscsi_nopin *hdr, bool nopout_response)
2893 {
2894         hdr->opcode             = ISCSI_OP_NOOP_IN;
2895         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2896         hton24(hdr->dlength, cmd->buf_ptr_size);
2897         if (nopout_response)
2898                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2899         hdr->itt                = cmd->init_task_tag;
2900         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2901         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2902                                   conn->stat_sn;
2903         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2904
2905         if (nopout_response)
2906                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2907
2908         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2909         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2910
2911         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2912                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2913                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2914                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2915 }
2916 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2917
2918 /*
2919  *      Unsolicited NOPIN, either requesting a response or not.
2920  */
2921 static int iscsit_send_unsolicited_nopin(
2922         struct iscsi_cmd *cmd,
2923         struct iscsi_conn *conn,
2924         int want_response)
2925 {
2926         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2927         int tx_size = ISCSI_HDR_LEN, ret;
2928
2929         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2930
2931         if (conn->conn_ops->HeaderDigest) {
2932                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2933
2934                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2935                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2936
2937                 tx_size += ISCSI_CRC_LEN;
2938                 pr_debug("Attaching CRC32C HeaderDigest to"
2939                         " NopIN 0x%08x\n", *header_digest);
2940         }
2941
2942         cmd->iov_misc[0].iov_base       = cmd->pdu;
2943         cmd->iov_misc[0].iov_len        = tx_size;
2944         cmd->iov_misc_count     = 1;
2945         cmd->tx_size            = tx_size;
2946
2947         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2948                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2949
2950         ret = iscsit_send_tx_data(cmd, conn, 1);
2951         if (ret < 0) {
2952                 iscsit_tx_thread_wait_for_tcp(conn);
2953                 return ret;
2954         }
2955
2956         spin_lock_bh(&cmd->istate_lock);
2957         cmd->i_state = want_response ?
2958                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2959         spin_unlock_bh(&cmd->istate_lock);
2960
2961         return 0;
2962 }
2963
2964 static int
2965 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2966 {
2967         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2968         struct kvec *iov;
2969         u32 padding = 0;
2970         int niov = 0, tx_size;
2971
2972         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2973
2974         tx_size = ISCSI_HDR_LEN;
2975         iov = &cmd->iov_misc[0];
2976         iov[niov].iov_base      = cmd->pdu;
2977         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2978
2979         if (conn->conn_ops->HeaderDigest) {
2980                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2981
2982                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2983                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2984
2985                 iov[0].iov_len += ISCSI_CRC_LEN;
2986                 tx_size += ISCSI_CRC_LEN;
2987                 pr_debug("Attaching CRC32C HeaderDigest"
2988                         " to NopIn 0x%08x\n", *header_digest);
2989         }
2990
2991         /*
2992          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2993          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2994          */
2995         if (cmd->buf_ptr_size) {
2996                 iov[niov].iov_base      = cmd->buf_ptr;
2997                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2998                 tx_size += cmd->buf_ptr_size;
2999
3000                 pr_debug("Echoing back %u bytes of ping"
3001                         " data.\n", cmd->buf_ptr_size);
3002
3003                 padding = ((-cmd->buf_ptr_size) & 3);
3004                 if (padding != 0) {
3005                         iov[niov].iov_base = &cmd->pad_bytes;
3006                         iov[niov++].iov_len = padding;
3007                         tx_size += padding;
3008                         pr_debug("Attaching %u additional"
3009                                 " padding bytes.\n", padding);
3010                 }
3011                 if (conn->conn_ops->DataDigest) {
3012                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3013                                 cmd->buf_ptr, cmd->buf_ptr_size,
3014                                 padding, (u8 *)&cmd->pad_bytes,
3015                                 (u8 *)&cmd->data_crc);
3016
3017                         iov[niov].iov_base = &cmd->data_crc;
3018                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3019                         tx_size += ISCSI_CRC_LEN;
3020                         pr_debug("Attached DataDigest for %u"
3021                                 " bytes of ping data, CRC 0x%08x\n",
3022                                 cmd->buf_ptr_size, cmd->data_crc);
3023                 }
3024         }
3025
3026         cmd->iov_misc_count = niov;
3027         cmd->tx_size = tx_size;
3028
3029         return 0;
3030 }
3031
3032 static int iscsit_send_r2t(
3033         struct iscsi_cmd *cmd,
3034         struct iscsi_conn *conn)
3035 {
3036         int tx_size = 0;
3037         struct iscsi_r2t *r2t;
3038         struct iscsi_r2t_rsp *hdr;
3039         int ret;
3040
3041         r2t = iscsit_get_r2t_from_list(cmd);
3042         if (!r2t)
3043                 return -1;
3044
3045         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3046         memset(hdr, 0, ISCSI_HDR_LEN);
3047         hdr->opcode             = ISCSI_OP_R2T;
3048         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3049         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3050                         (struct scsi_lun *)&hdr->lun);
3051         hdr->itt                = cmd->init_task_tag;
3052         r2t->targ_xfer_tag      = session_get_next_ttt(conn->sess);
3053         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3054         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3055         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3056         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3057         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3058         hdr->data_offset        = cpu_to_be32(r2t->offset);
3059         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3060
3061         cmd->iov_misc[0].iov_base       = cmd->pdu;
3062         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3063         tx_size += ISCSI_HDR_LEN;
3064
3065         if (conn->conn_ops->HeaderDigest) {
3066                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3067
3068                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3069                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3070
3071                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3072                 tx_size += ISCSI_CRC_LEN;
3073                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3074                         " PDU 0x%08x\n", *header_digest);
3075         }
3076
3077         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081                         r2t->offset, r2t->xfer_len, conn->cid);
3082
3083         cmd->iov_misc_count = 1;
3084         cmd->tx_size = tx_size;
3085
3086         spin_lock_bh(&cmd->r2t_lock);
3087         r2t->sent_r2t = 1;
3088         spin_unlock_bh(&cmd->r2t_lock);
3089
3090         ret = iscsit_send_tx_data(cmd, conn, 1);
3091         if (ret < 0) {
3092                 iscsit_tx_thread_wait_for_tcp(conn);
3093                 return ret;
3094         }
3095
3096         spin_lock_bh(&cmd->dataout_timeout_lock);
3097         iscsit_start_dataout_timer(cmd, conn);
3098         spin_unlock_bh(&cmd->dataout_timeout_lock);
3099
3100         return 0;
3101 }
3102
3103 /*
3104  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3105  *              connection recovery.
3106  */
3107 int iscsit_build_r2ts_for_cmd(
3108         struct iscsi_conn *conn,
3109         struct iscsi_cmd *cmd,
3110         bool recovery)
3111 {
3112         int first_r2t = 1;
3113         u32 offset = 0, xfer_len = 0;
3114
3115         spin_lock_bh(&cmd->r2t_lock);
3116         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3117                 spin_unlock_bh(&cmd->r2t_lock);
3118                 return 0;
3119         }
3120
3121         if (conn->sess->sess_ops->DataSequenceInOrder &&
3122             !recovery)
3123                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3124
3125         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3126                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3127                         offset = cmd->r2t_offset;
3128
3129                         if (first_r2t && recovery) {
3130                                 int new_data_end = offset +
3131                                         conn->sess->sess_ops->MaxBurstLength -
3132                                         cmd->next_burst_len;
3133
3134                                 if (new_data_end > cmd->se_cmd.data_length)
3135                                         xfer_len = cmd->se_cmd.data_length - offset;
3136                                 else
3137                                         xfer_len =
3138                                                 conn->sess->sess_ops->MaxBurstLength -
3139                                                 cmd->next_burst_len;
3140                         } else {
3141                                 int new_data_end = offset +
3142                                         conn->sess->sess_ops->MaxBurstLength;
3143
3144                                 if (new_data_end > cmd->se_cmd.data_length)
3145                                         xfer_len = cmd->se_cmd.data_length - offset;
3146                                 else
3147                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3148                         }
3149                         cmd->r2t_offset += xfer_len;
3150
3151                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3152                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153                 } else {
3154                         struct iscsi_seq *seq;
3155
3156                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3157                         if (!seq) {
3158                                 spin_unlock_bh(&cmd->r2t_lock);
3159                                 return -1;
3160                         }
3161
3162                         offset = seq->offset;
3163                         xfer_len = seq->xfer_len;
3164
3165                         if (cmd->seq_send_order == cmd->seq_count)
3166                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3167                 }
3168                 cmd->outstanding_r2ts++;
3169                 first_r2t = 0;
3170
3171                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3172                         spin_unlock_bh(&cmd->r2t_lock);
3173                         return -1;
3174                 }
3175
3176                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3177                         break;
3178         }
3179         spin_unlock_bh(&cmd->r2t_lock);
3180
3181         return 0;
3182 }
3183
3184 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3185                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3186 {
3187         if (inc_stat_sn)
3188                 cmd->stat_sn = conn->stat_sn++;
3189
3190         atomic_long_inc(&conn->sess->rsp_pdus);
3191
3192         memset(hdr, 0, ISCSI_HDR_LEN);
3193         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3194         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3195         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3196                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3197                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3199                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3200                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3201         }
3202         hdr->response           = cmd->iscsi_response;
3203         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3204         hdr->itt                = cmd->init_task_tag;
3205         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3206
3207         iscsit_increment_maxcmdsn(cmd, conn->sess);
3208         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3209         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3210
3211         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3212                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3213                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3214                 cmd->se_cmd.scsi_status, conn->cid);
3215 }
3216 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3217
3218 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3219 {
3220         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3221         struct kvec *iov;
3222         u32 padding = 0, tx_size = 0;
3223         int iov_count = 0;
3224         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3225
3226         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3227
3228         iov = &cmd->iov_misc[0];
3229         iov[iov_count].iov_base = cmd->pdu;
3230         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3231         tx_size += ISCSI_HDR_LEN;
3232
3233         /*
3234          * Attach SENSE DATA payload to iSCSI Response PDU
3235          */
3236         if (cmd->se_cmd.sense_buffer &&
3237            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3238             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3239                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3240                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3241
3242                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3243                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3244                 iov[iov_count].iov_base = cmd->sense_buffer;
3245                 iov[iov_count++].iov_len =
3246                                 (cmd->se_cmd.scsi_sense_length + padding);
3247                 tx_size += cmd->se_cmd.scsi_sense_length;
3248
3249                 if (padding) {
3250                         memset(cmd->sense_buffer +
3251                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3252                         tx_size += padding;
3253                         pr_debug("Adding %u bytes of padding to"
3254                                 " SENSE.\n", padding);
3255                 }
3256
3257                 if (conn->conn_ops->DataDigest) {
3258                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3259                                 cmd->sense_buffer,
3260                                 (cmd->se_cmd.scsi_sense_length + padding),
3261                                 0, NULL, (u8 *)&cmd->data_crc);
3262
3263                         iov[iov_count].iov_base    = &cmd->data_crc;
3264                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3265                         tx_size += ISCSI_CRC_LEN;
3266
3267                         pr_debug("Attaching CRC32 DataDigest for"
3268                                 " SENSE, %u bytes CRC 0x%08x\n",
3269                                 (cmd->se_cmd.scsi_sense_length + padding),
3270                                 cmd->data_crc);
3271                 }
3272
3273                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3274                                 " Response PDU\n",
3275                                 cmd->se_cmd.scsi_sense_length);
3276         }
3277
3278         if (conn->conn_ops->HeaderDigest) {
3279                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3280
3281                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3282                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3283
3284                 iov[0].iov_len += ISCSI_CRC_LEN;
3285                 tx_size += ISCSI_CRC_LEN;
3286                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3287                                 " PDU 0x%08x\n", *header_digest);
3288         }
3289
3290         cmd->iov_misc_count = iov_count;
3291         cmd->tx_size = tx_size;
3292
3293         return 0;
3294 }
3295
3296 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3297 {
3298         switch (se_tmr->response) {
3299         case TMR_FUNCTION_COMPLETE:
3300                 return ISCSI_TMF_RSP_COMPLETE;
3301         case TMR_TASK_DOES_NOT_EXIST:
3302                 return ISCSI_TMF_RSP_NO_TASK;
3303         case TMR_LUN_DOES_NOT_EXIST:
3304                 return ISCSI_TMF_RSP_NO_LUN;
3305         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3306                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3307         case TMR_FUNCTION_REJECTED:
3308         default:
3309                 return ISCSI_TMF_RSP_REJECTED;
3310         }
3311 }
3312
3313 void
3314 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3315                           struct iscsi_tm_rsp *hdr)
3316 {
3317         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3318
3319         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3320         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3321         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3322         hdr->itt                = cmd->init_task_tag;
3323         cmd->stat_sn            = conn->stat_sn++;
3324         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3325
3326         iscsit_increment_maxcmdsn(cmd, conn->sess);
3327         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3328         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3329
3330         pr_debug("Built Task Management Response ITT: 0x%08x,"
3331                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3332                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3333 }
3334 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3335
3336 static int
3337 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3338 {
3339         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3340         u32 tx_size = 0;
3341
3342         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3343
3344         cmd->iov_misc[0].iov_base       = cmd->pdu;
3345         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3346         tx_size += ISCSI_HDR_LEN;
3347
3348         if (conn->conn_ops->HeaderDigest) {
3349                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3350
3351                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3352                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3353
3354                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3355                 tx_size += ISCSI_CRC_LEN;
3356                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3357                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3358         }
3359
3360         cmd->iov_misc_count = 1;
3361         cmd->tx_size = tx_size;
3362
3363         return 0;
3364 }
3365
3366 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3367 {
3368         bool ret = false;
3369
3370         if (np->np_sockaddr.ss_family == AF_INET6) {
3371                 const struct sockaddr_in6 sin6 = {
3372                         .sin6_addr = IN6ADDR_ANY_INIT };
3373                 struct sockaddr_in6 *sock_in6 =
3374                          (struct sockaddr_in6 *)&np->np_sockaddr;
3375
3376                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3377                                 sin6.sin6_addr.s6_addr, 16))
3378                         ret = true;
3379         } else {
3380                 struct sockaddr_in * sock_in =
3381                         (struct sockaddr_in *)&np->np_sockaddr;
3382
3383                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3384                         ret = true;
3385         }
3386
3387         return ret;
3388 }
3389
3390 #define SENDTARGETS_BUF_LIMIT 32768U
3391
3392 static int
3393 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3394                                   enum iscsit_transport_type network_transport,
3395                                   int skip_bytes, bool *completed)
3396 {
3397         char *payload = NULL;
3398         struct iscsi_conn *conn = cmd->conn;
3399         struct iscsi_portal_group *tpg;
3400         struct iscsi_tiqn *tiqn;
3401         struct iscsi_tpg_np *tpg_np;
3402         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3403         int target_name_printed;
3404         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3405         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3406
3407         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3408                          SENDTARGETS_BUF_LIMIT);
3409
3410         payload = kzalloc(buffer_len, GFP_KERNEL);
3411         if (!payload) {
3412                 pr_err("Unable to allocate memory for sendtargets"
3413                                 " response.\n");
3414                 return -ENOMEM;
3415         }
3416         /*
3417          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3418          * explicit case..
3419          */
3420         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3421                 text_ptr = strchr(text_in, '=');
3422                 if (!text_ptr) {
3423                         pr_err("Unable to locate '=' string in text_in:"
3424                                " %s\n", text_in);
3425                         kfree(payload);
3426                         return -EINVAL;
3427                 }
3428                 /*
3429                  * Skip over '=' character..
3430                  */
3431                 text_ptr += 1;
3432         }
3433
3434         spin_lock(&tiqn_lock);
3435         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3436                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3437                      strcmp(tiqn->tiqn, text_ptr)) {
3438                         continue;
3439                 }
3440
3441                 target_name_printed = 0;
3442
3443                 spin_lock(&tiqn->tiqn_tpg_lock);
3444                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3445
3446                         /* If demo_mode_discovery=0 and generate_node_acls=0
3447                          * (demo mode dislabed) do not return
3448                          * TargetName+TargetAddress unless a NodeACL exists.
3449                          */
3450
3451                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3452                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3453                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3454                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3455                                 continue;
3456                         }
3457
3458                         spin_lock(&tpg->tpg_state_lock);
3459                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3460                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3461                                 spin_unlock(&tpg->tpg_state_lock);
3462                                 continue;
3463                         }
3464                         spin_unlock(&tpg->tpg_state_lock);
3465
3466                         spin_lock(&tpg->tpg_np_lock);
3467                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3468                                                 tpg_np_list) {
3469                                 struct iscsi_np *np = tpg_np->tpg_np;
3470                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3471                                 char *fmt_str;
3472
3473                                 if (np->np_network_transport != network_transport)
3474                                         continue;
3475
3476                                 if (!target_name_printed) {
3477                                         len = sprintf(buf, "TargetName=%s",
3478                                                       tiqn->tiqn);
3479                                         len += 1;
3480
3481                                         if ((len + payload_len) > buffer_len) {
3482                                                 spin_unlock(&tpg->tpg_np_lock);
3483                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3484                                                 end_of_buf = 1;
3485                                                 goto eob;
3486                                         }
3487
3488                                         if (skip_bytes && len <= skip_bytes) {
3489                                                 skip_bytes -= len;
3490                                         } else {
3491                                                 memcpy(payload + payload_len, buf, len);
3492                                                 payload_len += len;
3493                                                 target_name_printed = 1;
3494                                                 if (len > skip_bytes)
3495                                                         skip_bytes = 0;
3496                                         }
3497                                 }
3498
3499                                 if (np->np_sockaddr.ss_family == AF_INET6)
3500                                         fmt_str = "TargetAddress=[%s]:%hu,%hu";
3501                                 else
3502                                         fmt_str = "TargetAddress=%s:%hu,%hu";
3503
3504                                 len = sprintf(buf, fmt_str,
3505                                         inaddr_any ? conn->local_ip : np->np_ip,
3506                                         np->np_port,
3507                                         tpg->tpgt);
3508                                 len += 1;
3509
3510                                 if ((len + payload_len) > buffer_len) {
3511                                         spin_unlock(&tpg->tpg_np_lock);
3512                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3513                                         end_of_buf = 1;
3514                                         goto eob;
3515                                 }
3516
3517                                 if (skip_bytes && len <= skip_bytes) {
3518                                         skip_bytes -= len;
3519                                 } else {
3520                                         memcpy(payload + payload_len, buf, len);
3521                                         payload_len += len;
3522                                         if (len > skip_bytes)
3523                                                 skip_bytes = 0;
3524                                 }
3525                         }
3526                         spin_unlock(&tpg->tpg_np_lock);
3527                 }
3528                 spin_unlock(&tiqn->tiqn_tpg_lock);
3529 eob:
3530                 if (end_of_buf) {
3531                         *completed = false;
3532                         break;
3533                 }
3534
3535                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3536                         break;
3537         }
3538         spin_unlock(&tiqn_lock);
3539
3540         cmd->buf_ptr = payload;
3541
3542         return payload_len;
3543 }
3544
3545 int
3546 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3547                       struct iscsi_text_rsp *hdr,
3548                       enum iscsit_transport_type network_transport)
3549 {
3550         int text_length, padding;
3551         bool completed = true;
3552
3553         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3554                                                         cmd->read_data_done,
3555                                                         &completed);
3556         if (text_length < 0)
3557                 return text_length;
3558
3559         if (completed) {
3560                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3561         } else {
3562                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3563                 cmd->read_data_done += text_length;
3564                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3565                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3566         }
3567         hdr->opcode = ISCSI_OP_TEXT_RSP;
3568         padding = ((-text_length) & 3);
3569         hton24(hdr->dlength, text_length);
3570         hdr->itt = cmd->init_task_tag;
3571         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3572         cmd->stat_sn = conn->stat_sn++;
3573         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3574
3575         iscsit_increment_maxcmdsn(cmd, conn->sess);
3576         /*
3577          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3578          * correctly increment MaxCmdSN for each response answering a
3579          * non immediate text request with a valid CmdSN.
3580          */
3581         cmd->maxcmdsn_inc = 0;
3582         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3583         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3584
3585         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3586                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3587                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3588                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3589                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3590
3591         return text_length + padding;
3592 }
3593 EXPORT_SYMBOL(iscsit_build_text_rsp);
3594
3595 static int iscsit_send_text_rsp(
3596         struct iscsi_cmd *cmd,
3597         struct iscsi_conn *conn)
3598 {
3599         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3600         struct kvec *iov;
3601         u32 tx_size = 0;
3602         int text_length, iov_count = 0, rc;
3603
3604         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3605         if (rc < 0)
3606                 return rc;
3607
3608         text_length = rc;
3609         iov = &cmd->iov_misc[0];
3610         iov[iov_count].iov_base = cmd->pdu;
3611         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3612         iov[iov_count].iov_base = cmd->buf_ptr;
3613         iov[iov_count++].iov_len = text_length;
3614
3615         tx_size += (ISCSI_HDR_LEN + text_length);
3616
3617         if (conn->conn_ops->HeaderDigest) {
3618                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3619
3620                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3621                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3622
3623                 iov[0].iov_len += ISCSI_CRC_LEN;
3624                 tx_size += ISCSI_CRC_LEN;
3625                 pr_debug("Attaching CRC32 HeaderDigest for"
3626                         " Text Response PDU 0x%08x\n", *header_digest);
3627         }
3628
3629         if (conn->conn_ops->DataDigest) {
3630                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3631                                 cmd->buf_ptr, text_length,
3632                                 0, NULL, (u8 *)&cmd->data_crc);
3633
3634                 iov[iov_count].iov_base = &cmd->data_crc;
3635                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3636                 tx_size += ISCSI_CRC_LEN;
3637
3638                 pr_debug("Attaching DataDigest for %u bytes of text"
3639                         " data, CRC 0x%08x\n", text_length,
3640                         cmd->data_crc);
3641         }
3642
3643         cmd->iov_misc_count = iov_count;
3644         cmd->tx_size = tx_size;
3645
3646         return 0;
3647 }
3648
3649 void
3650 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3651                     struct iscsi_reject *hdr)
3652 {
3653         hdr->opcode             = ISCSI_OP_REJECT;
3654         hdr->reason             = cmd->reject_reason;
3655         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3656         hton24(hdr->dlength, ISCSI_HDR_LEN);
3657         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3658         cmd->stat_sn            = conn->stat_sn++;
3659         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3660         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3661         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3662
3663 }
3664 EXPORT_SYMBOL(iscsit_build_reject);
3665
3666 static int iscsit_send_reject(
3667         struct iscsi_cmd *cmd,
3668         struct iscsi_conn *conn)
3669 {
3670         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3671         struct kvec *iov;
3672         u32 iov_count = 0, tx_size;
3673
3674         iscsit_build_reject(cmd, conn, hdr);
3675
3676         iov = &cmd->iov_misc[0];
3677         iov[iov_count].iov_base = cmd->pdu;
3678         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3679         iov[iov_count].iov_base = cmd->buf_ptr;
3680         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3681
3682         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3683
3684         if (conn->conn_ops->HeaderDigest) {
3685                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3686
3687                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3688                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3689
3690                 iov[0].iov_len += ISCSI_CRC_LEN;
3691                 tx_size += ISCSI_CRC_LEN;
3692                 pr_debug("Attaching CRC32 HeaderDigest for"
3693                         " REJECT PDU 0x%08x\n", *header_digest);
3694         }
3695
3696         if (conn->conn_ops->DataDigest) {
3697                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3698                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3699
3700                 iov[iov_count].iov_base = &cmd->data_crc;
3701                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3702                 tx_size += ISCSI_CRC_LEN;
3703                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3704                                 " PDU 0x%08x\n", cmd->data_crc);
3705         }
3706
3707         cmd->iov_misc_count = iov_count;
3708         cmd->tx_size = tx_size;
3709
3710         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3711                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3712
3713         return 0;
3714 }
3715
3716 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3717 {
3718         int ord, cpu;
3719         /*
3720          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3721          * within iscsit_start_kthreads()
3722          *
3723          * Here we use bitmap_id to determine which CPU that this
3724          * iSCSI connection's RX/TX threads will be scheduled to
3725          * execute upon.
3726          */
3727         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3728         for_each_online_cpu(cpu) {
3729                 if (ord-- == 0) {
3730                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3731                         return;
3732                 }
3733         }
3734         /*
3735          * This should never be reached..
3736          */
3737         dump_stack();
3738         cpumask_setall(conn->conn_cpumask);
3739 }
3740
3741 static inline void iscsit_thread_check_cpumask(
3742         struct iscsi_conn *conn,
3743         struct task_struct *p,
3744         int mode)
3745 {
3746         /*
3747          * mode == 1 signals iscsi_target_tx_thread() usage.
3748          * mode == 0 signals iscsi_target_rx_thread() usage.
3749          */
3750         if (mode == 1) {
3751                 if (!conn->conn_tx_reset_cpumask)
3752                         return;
3753                 conn->conn_tx_reset_cpumask = 0;
3754         } else {
3755                 if (!conn->conn_rx_reset_cpumask)
3756                         return;
3757                 conn->conn_rx_reset_cpumask = 0;
3758         }
3759         /*
3760          * Update the CPU mask for this single kthread so that
3761          * both TX and RX kthreads are scheduled to run on the
3762          * same CPU.
3763          */
3764         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3765 }
3766
3767 static int
3768 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3769 {
3770         int ret;
3771
3772         switch (state) {
3773         case ISTATE_SEND_R2T:
3774                 ret = iscsit_send_r2t(cmd, conn);
3775                 if (ret < 0)
3776                         goto err;
3777                 break;
3778         case ISTATE_REMOVE:
3779                 spin_lock_bh(&conn->cmd_lock);
3780                 list_del_init(&cmd->i_conn_node);
3781                 spin_unlock_bh(&conn->cmd_lock);
3782
3783                 iscsit_free_cmd(cmd, false);
3784                 break;
3785         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3786                 iscsit_mod_nopin_response_timer(conn);
3787                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3788                 if (ret < 0)
3789                         goto err;
3790                 break;
3791         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3792                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3793                 if (ret < 0)
3794                         goto err;
3795                 break;
3796         default:
3797                 pr_err("Unknown Opcode: 0x%02x ITT:"
3798                        " 0x%08x, i_state: %d on CID: %hu\n",
3799                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3800                        conn->cid);
3801                 goto err;
3802         }
3803
3804         return 0;
3805
3806 err:
3807         return -1;
3808 }
3809
3810 static int
3811 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3812 {
3813         struct iscsit_transport *t = conn->conn_transport;
3814         struct iscsi_queue_req *qr;
3815         struct iscsi_cmd *cmd;
3816         u8 state;
3817         int ret;
3818
3819         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3820                 atomic_set(&conn->check_immediate_queue, 0);
3821                 cmd = qr->cmd;
3822                 state = qr->state;
3823                 kmem_cache_free(lio_qr_cache, qr);
3824
3825                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3826                 if (ret < 0)
3827                         return ret;
3828         }
3829
3830         return 0;
3831 }
3832
3833 static int
3834 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3835 {
3836         int ret;
3837
3838 check_rsp_state:
3839         switch (state) {
3840         case ISTATE_SEND_DATAIN:
3841                 ret = iscsit_send_datain(cmd, conn);
3842                 if (ret < 0)
3843                         goto err;
3844                 else if (!ret)
3845                         /* more drs */
3846                         goto check_rsp_state;
3847                 else if (ret == 1) {
3848                         /* all done */
3849                         spin_lock_bh(&cmd->istate_lock);
3850                         cmd->i_state = ISTATE_SENT_STATUS;
3851                         spin_unlock_bh(&cmd->istate_lock);
3852
3853                         if (atomic_read(&conn->check_immediate_queue))
3854                                 return 1;
3855
3856                         return 0;
3857                 } else if (ret == 2) {
3858                         /* Still must send status,
3859                            SCF_TRANSPORT_TASK_SENSE was set */
3860                         spin_lock_bh(&cmd->istate_lock);
3861                         cmd->i_state = ISTATE_SEND_STATUS;
3862                         spin_unlock_bh(&cmd->istate_lock);
3863                         state = ISTATE_SEND_STATUS;
3864                         goto check_rsp_state;
3865                 }
3866
3867                 break;
3868         case ISTATE_SEND_STATUS:
3869         case ISTATE_SEND_STATUS_RECOVERY:
3870                 ret = iscsit_send_response(cmd, conn);
3871                 break;
3872         case ISTATE_SEND_LOGOUTRSP:
3873                 ret = iscsit_send_logout(cmd, conn);
3874                 break;
3875         case ISTATE_SEND_ASYNCMSG:
3876                 ret = iscsit_send_conn_drop_async_message(
3877                         cmd, conn);
3878                 break;
3879         case ISTATE_SEND_NOPIN:
3880                 ret = iscsit_send_nopin(cmd, conn);
3881                 break;
3882         case ISTATE_SEND_REJECT:
3883                 ret = iscsit_send_reject(cmd, conn);
3884                 break;
3885         case ISTATE_SEND_TASKMGTRSP:
3886                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3887                 if (ret != 0)
3888                         break;
3889                 ret = iscsit_tmr_post_handler(cmd, conn);
3890                 if (ret != 0)
3891                         iscsit_fall_back_to_erl0(conn->sess);
3892                 break;
3893         case ISTATE_SEND_TEXTRSP:
3894                 ret = iscsit_send_text_rsp(cmd, conn);
3895                 break;
3896         default:
3897                 pr_err("Unknown Opcode: 0x%02x ITT:"
3898                        " 0x%08x, i_state: %d on CID: %hu\n",
3899                        cmd->iscsi_opcode, cmd->init_task_tag,
3900                        state, conn->cid);
3901                 goto err;
3902         }
3903         if (ret < 0)
3904                 goto err;
3905
3906         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3907                 iscsit_tx_thread_wait_for_tcp(conn);
3908                 iscsit_unmap_iovec(cmd);
3909                 goto err;
3910         }
3911         iscsit_unmap_iovec(cmd);
3912
3913         switch (state) {
3914         case ISTATE_SEND_LOGOUTRSP:
3915                 if (!iscsit_logout_post_handler(cmd, conn))
3916                         return -ECONNRESET;
3917                 /* fall through */
3918         case ISTATE_SEND_STATUS:
3919         case ISTATE_SEND_ASYNCMSG:
3920         case ISTATE_SEND_NOPIN:
3921         case ISTATE_SEND_STATUS_RECOVERY:
3922         case ISTATE_SEND_TEXTRSP:
3923         case ISTATE_SEND_TASKMGTRSP:
3924         case ISTATE_SEND_REJECT:
3925                 spin_lock_bh(&cmd->istate_lock);
3926                 cmd->i_state = ISTATE_SENT_STATUS;
3927                 spin_unlock_bh(&cmd->istate_lock);
3928                 break;
3929         default:
3930                 pr_err("Unknown Opcode: 0x%02x ITT:"
3931                        " 0x%08x, i_state: %d on CID: %hu\n",
3932                        cmd->iscsi_opcode, cmd->init_task_tag,
3933                        cmd->i_state, conn->cid);
3934                 goto err;
3935         }
3936
3937         if (atomic_read(&conn->check_immediate_queue))
3938                 return 1;
3939
3940         return 0;
3941
3942 err:
3943         return -1;
3944 }
3945
3946 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3947 {
3948         struct iscsit_transport *t = conn->conn_transport;
3949         struct iscsi_queue_req *qr;
3950         struct iscsi_cmd *cmd;
3951         u8 state;
3952         int ret;
3953
3954         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3955                 cmd = qr->cmd;
3956                 state = qr->state;
3957                 kmem_cache_free(lio_qr_cache, qr);
3958
3959                 ret = t->iscsit_response_queue(conn, cmd, state);
3960                 if (ret == 1 || ret < 0)
3961                         return ret;
3962         }
3963
3964         return 0;
3965 }
3966
3967 int iscsi_target_tx_thread(void *arg)
3968 {
3969         int ret = 0;
3970         struct iscsi_conn *conn = arg;
3971         /*
3972          * Allow ourselves to be interrupted by SIGINT so that a
3973          * connection recovery / failure event can be triggered externally.
3974          */
3975         allow_signal(SIGINT);
3976
3977         while (!kthread_should_stop()) {
3978                 /*
3979                  * Ensure that both TX and RX per connection kthreads
3980                  * are scheduled to run on the same CPU.
3981                  */
3982                 iscsit_thread_check_cpumask(conn, current, 1);
3983
3984                 wait_event_interruptible(conn->queues_wq,
3985                                          !iscsit_conn_all_queues_empty(conn));
3986
3987                 if (signal_pending(current))
3988                         goto transport_err;
3989
3990 get_immediate:
3991                 ret = iscsit_handle_immediate_queue(conn);
3992                 if (ret < 0)
3993                         goto transport_err;
3994
3995                 ret = iscsit_handle_response_queue(conn);
3996                 if (ret == 1)
3997                         goto get_immediate;
3998                 else if (ret == -ECONNRESET)
3999                         goto out;
4000                 else if (ret < 0)
4001                         goto transport_err;
4002         }
4003
4004 transport_err:
4005         iscsit_take_action_for_connection_exit(conn);
4006 out:
4007         return 0;
4008 }
4009
4010 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4011 {
4012         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4013         struct iscsi_cmd *cmd;
4014         int ret = 0;
4015
4016         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4017         case ISCSI_OP_SCSI_CMD:
4018                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4019                 if (!cmd)
4020                         goto reject;
4021
4022                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4023                 break;
4024         case ISCSI_OP_SCSI_DATA_OUT:
4025                 ret = iscsit_handle_data_out(conn, buf);
4026                 break;
4027         case ISCSI_OP_NOOP_OUT:
4028                 cmd = NULL;
4029                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4030                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4031                         if (!cmd)
4032                                 goto reject;
4033                 }
4034                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4035                 break;
4036         case ISCSI_OP_SCSI_TMFUNC:
4037                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4038                 if (!cmd)
4039                         goto reject;
4040
4041                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4042                 break;
4043         case ISCSI_OP_TEXT:
4044                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4045                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4046                         if (!cmd)
4047                                 goto reject;
4048                 } else {
4049                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4050                         if (!cmd)
4051                                 goto reject;
4052                 }
4053
4054                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4055                 break;
4056         case ISCSI_OP_LOGOUT:
4057                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4058                 if (!cmd)
4059                         goto reject;
4060
4061                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4062                 if (ret > 0)
4063                         wait_for_completion_timeout(&conn->conn_logout_comp,
4064                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4065                 break;
4066         case ISCSI_OP_SNACK:
4067                 ret = iscsit_handle_snack(conn, buf);
4068                 break;
4069         default:
4070                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4071                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4072                         pr_err("Cannot recover from unknown"
4073                         " opcode while ERL=0, closing iSCSI connection.\n");
4074                         return -1;
4075                 }
4076                 if (!conn->conn_ops->OFMarker) {
4077                         pr_err("Unable to recover from unknown"
4078                         " opcode while OFMarker=No, closing iSCSI"
4079                                 " connection.\n");
4080                         return -1;
4081                 }
4082                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4083                         pr_err("Unable to recover from unknown"
4084                                 " opcode, closing iSCSI connection.\n");
4085                         return -1;
4086                 }
4087                 break;
4088         }
4089
4090         return ret;
4091 reject:
4092         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4093 }
4094
4095 int iscsi_target_rx_thread(void *arg)
4096 {
4097         int ret;
4098         u8 buffer[ISCSI_HDR_LEN], opcode;
4099         u32 checksum = 0, digest = 0;
4100         struct iscsi_conn *conn = arg;
4101         struct kvec iov;
4102         /*
4103          * Allow ourselves to be interrupted by SIGINT so that a
4104          * connection recovery / failure event can be triggered externally.
4105          */
4106         allow_signal(SIGINT);
4107
4108         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4109                 struct completion comp;
4110                 int rc;
4111
4112                 init_completion(&comp);
4113                 rc = wait_for_completion_interruptible(&comp);
4114                 if (rc < 0)
4115                         goto transport_err;
4116
4117                 goto transport_err;
4118         }
4119
4120         while (!kthread_should_stop()) {
4121                 /*
4122                  * Ensure that both TX and RX per connection kthreads
4123                  * are scheduled to run on the same CPU.
4124                  */
4125                 iscsit_thread_check_cpumask(conn, current, 0);
4126
4127                 memset(buffer, 0, ISCSI_HDR_LEN);
4128                 memset(&iov, 0, sizeof(struct kvec));
4129
4130                 iov.iov_base    = buffer;
4131                 iov.iov_len     = ISCSI_HDR_LEN;
4132
4133                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4134                 if (ret != ISCSI_HDR_LEN) {
4135                         iscsit_rx_thread_wait_for_tcp(conn);
4136                         goto transport_err;
4137                 }
4138
4139                 if (conn->conn_ops->HeaderDigest) {
4140                         iov.iov_base    = &digest;
4141                         iov.iov_len     = ISCSI_CRC_LEN;
4142
4143                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4144                         if (ret != ISCSI_CRC_LEN) {
4145                                 iscsit_rx_thread_wait_for_tcp(conn);
4146                                 goto transport_err;
4147                         }
4148
4149                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4150                                         buffer, ISCSI_HDR_LEN,
4151                                         0, NULL, (u8 *)&checksum);
4152
4153                         if (digest != checksum) {
4154                                 pr_err("HeaderDigest CRC32C failed,"
4155                                         " received 0x%08x, computed 0x%08x\n",
4156                                         digest, checksum);
4157                                 /*
4158                                  * Set the PDU to 0xff so it will intentionally
4159                                  * hit default in the switch below.
4160                                  */
4161                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4162                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4163                         } else {
4164                                 pr_debug("Got HeaderDigest CRC32C"
4165                                                 " 0x%08x\n", checksum);
4166                         }
4167                 }
4168
4169                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4170                         goto transport_err;
4171
4172                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4173
4174                 if (conn->sess->sess_ops->SessionType &&
4175                    ((!(opcode & ISCSI_OP_TEXT)) ||
4176                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4177                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4178                         " while in Discovery Session, rejecting.\n", opcode);
4179                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4180                                           buffer);
4181                         goto transport_err;
4182                 }
4183
4184                 ret = iscsi_target_rx_opcode(conn, buffer);
4185                 if (ret < 0)
4186                         goto transport_err;
4187         }
4188
4189 transport_err:
4190         if (!signal_pending(current))
4191                 atomic_set(&conn->transport_failed, 1);
4192         iscsit_take_action_for_connection_exit(conn);
4193         return 0;
4194 }
4195
4196 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4197 {
4198         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4199         struct iscsi_session *sess = conn->sess;
4200         /*
4201          * We expect this function to only ever be called from either RX or TX
4202          * thread context via iscsit_close_connection() once the other context
4203          * has been reset -> returned sleeping pre-handler state.
4204          */
4205         spin_lock_bh(&conn->cmd_lock);
4206         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4207
4208                 list_del_init(&cmd->i_conn_node);
4209                 spin_unlock_bh(&conn->cmd_lock);
4210
4211                 iscsit_increment_maxcmdsn(cmd, sess);
4212
4213                 iscsit_free_cmd(cmd, true);
4214
4215                 spin_lock_bh(&conn->cmd_lock);
4216         }
4217         spin_unlock_bh(&conn->cmd_lock);
4218 }
4219
4220 static void iscsit_stop_timers_for_cmds(
4221         struct iscsi_conn *conn)
4222 {
4223         struct iscsi_cmd *cmd;
4224
4225         spin_lock_bh(&conn->cmd_lock);
4226         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4227                 if (cmd->data_direction == DMA_TO_DEVICE)
4228                         iscsit_stop_dataout_timer(cmd);
4229         }
4230         spin_unlock_bh(&conn->cmd_lock);
4231 }
4232
4233 int iscsit_close_connection(
4234         struct iscsi_conn *conn)
4235 {
4236         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4237         struct iscsi_session    *sess = conn->sess;
4238
4239         pr_debug("Closing iSCSI connection CID %hu on SID:"
4240                 " %u\n", conn->cid, sess->sid);
4241         /*
4242          * Always up conn_logout_comp for the traditional TCP case just in case
4243          * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4244          * response never got sent because the connection failed.
4245          *
4246          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4247          * to signal logout response TX interrupt completion.  Go ahead and skip
4248          * this for iser since isert_rx_opcode() does not wait on logout failure,
4249          * and to avoid iscsi_conn pointer dereference in iser-target code.
4250          */
4251         if (conn->conn_transport->transport_type == ISCSI_TCP)
4252                 complete(&conn->conn_logout_comp);
4253
4254         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4255                 if (conn->tx_thread &&
4256                     cmpxchg(&conn->tx_thread_active, true, false)) {
4257                         send_sig(SIGINT, conn->tx_thread, 1);
4258                         kthread_stop(conn->tx_thread);
4259                 }
4260         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4261                 if (conn->rx_thread &&
4262                     cmpxchg(&conn->rx_thread_active, true, false)) {
4263                         send_sig(SIGINT, conn->rx_thread, 1);
4264                         kthread_stop(conn->rx_thread);
4265                 }
4266         }
4267
4268         spin_lock(&iscsit_global->ts_bitmap_lock);
4269         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4270                               get_order(1));
4271         spin_unlock(&iscsit_global->ts_bitmap_lock);
4272
4273         iscsit_stop_timers_for_cmds(conn);
4274         iscsit_stop_nopin_response_timer(conn);
4275         iscsit_stop_nopin_timer(conn);
4276
4277         if (conn->conn_transport->iscsit_wait_conn)
4278                 conn->conn_transport->iscsit_wait_conn(conn);
4279
4280         /*
4281          * During Connection recovery drop unacknowledged out of order
4282          * commands for this connection, and prepare the other commands
4283          * for realligence.
4284          *
4285          * During normal operation clear the out of order commands (but
4286          * do not free the struct iscsi_ooo_cmdsn's) and release all
4287          * struct iscsi_cmds.
4288          */
4289         if (atomic_read(&conn->connection_recovery)) {
4290                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4291                 iscsit_prepare_cmds_for_realligance(conn);
4292         } else {
4293                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4294                 iscsit_release_commands_from_conn(conn);
4295         }
4296         iscsit_free_queue_reqs_for_conn(conn);
4297
4298         /*
4299          * Handle decrementing session or connection usage count if
4300          * a logout response was not able to be sent because the
4301          * connection failed.  Fall back to Session Recovery here.
4302          */
4303         if (atomic_read(&conn->conn_logout_remove)) {
4304                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4305                         iscsit_dec_conn_usage_count(conn);
4306                         iscsit_dec_session_usage_count(sess);
4307                 }
4308                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4309                         iscsit_dec_conn_usage_count(conn);
4310
4311                 atomic_set(&conn->conn_logout_remove, 0);
4312                 atomic_set(&sess->session_reinstatement, 0);
4313                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4314         }
4315
4316         spin_lock_bh(&sess->conn_lock);
4317         list_del(&conn->conn_list);
4318
4319         /*
4320          * Attempt to let the Initiator know this connection failed by
4321          * sending an Connection Dropped Async Message on another
4322          * active connection.
4323          */
4324         if (atomic_read(&conn->connection_recovery))
4325                 iscsit_build_conn_drop_async_message(conn);
4326
4327         spin_unlock_bh(&sess->conn_lock);
4328
4329         /*
4330          * If connection reinstatement is being performed on this connection,
4331          * up the connection reinstatement semaphore that is being blocked on
4332          * in iscsit_cause_connection_reinstatement().
4333          */
4334         spin_lock_bh(&conn->state_lock);
4335         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4336                 spin_unlock_bh(&conn->state_lock);
4337                 complete(&conn->conn_wait_comp);
4338                 wait_for_completion(&conn->conn_post_wait_comp);
4339                 spin_lock_bh(&conn->state_lock);
4340         }
4341
4342         /*
4343          * If connection reinstatement is being performed on this connection
4344          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4345          * connection wait rcfr semaphore that is being blocked on
4346          * an iscsit_connection_reinstatement_rcfr().
4347          */
4348         if (atomic_read(&conn->connection_wait_rcfr)) {
4349                 spin_unlock_bh(&conn->state_lock);
4350                 complete(&conn->conn_wait_rcfr_comp);
4351                 wait_for_completion(&conn->conn_post_wait_comp);
4352                 spin_lock_bh(&conn->state_lock);
4353         }
4354         atomic_set(&conn->connection_reinstatement, 1);
4355         spin_unlock_bh(&conn->state_lock);
4356
4357         /*
4358          * If any other processes are accessing this connection pointer we
4359          * must wait until they have completed.
4360          */
4361         iscsit_check_conn_usage_count(conn);
4362
4363         if (conn->conn_rx_hash.tfm)
4364                 crypto_free_hash(conn->conn_rx_hash.tfm);
4365         if (conn->conn_tx_hash.tfm)
4366                 crypto_free_hash(conn->conn_tx_hash.tfm);
4367
4368         free_cpumask_var(conn->conn_cpumask);
4369
4370         kfree(conn->conn_ops);
4371         conn->conn_ops = NULL;
4372
4373         if (conn->sock)
4374                 sock_release(conn->sock);
4375
4376         if (conn->conn_transport->iscsit_free_conn)
4377                 conn->conn_transport->iscsit_free_conn(conn);
4378
4379         iscsit_put_transport(conn->conn_transport);
4380
4381         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4382         conn->conn_state = TARG_CONN_STATE_FREE;
4383         kfree(conn);
4384
4385         spin_lock_bh(&sess->conn_lock);
4386         atomic_dec(&sess->nconn);
4387         pr_debug("Decremented iSCSI connection count to %hu from node:"
4388                 " %s\n", atomic_read(&sess->nconn),
4389                 sess->sess_ops->InitiatorName);
4390         /*
4391          * Make sure that if one connection fails in an non ERL=2 iSCSI
4392          * Session that they all fail.
4393          */
4394         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4395              !atomic_read(&sess->session_logout))
4396                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4397
4398         /*
4399          * If this was not the last connection in the session, and we are
4400          * performing session reinstatement or falling back to ERL=0, call
4401          * iscsit_stop_session() without sleeping to shutdown the other
4402          * active connections.
4403          */
4404         if (atomic_read(&sess->nconn)) {
4405                 if (!atomic_read(&sess->session_reinstatement) &&
4406                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4407                         spin_unlock_bh(&sess->conn_lock);
4408                         return 0;
4409                 }
4410                 if (!atomic_read(&sess->session_stop_active)) {
4411                         atomic_set(&sess->session_stop_active, 1);
4412                         spin_unlock_bh(&sess->conn_lock);
4413                         iscsit_stop_session(sess, 0, 0);
4414                         return 0;
4415                 }
4416                 spin_unlock_bh(&sess->conn_lock);
4417                 return 0;
4418         }
4419
4420         /*
4421          * If this was the last connection in the session and one of the
4422          * following is occurring:
4423          *
4424          * Session Reinstatement is not being performed, and are falling back
4425          * to ERL=0 call iscsit_close_session().
4426          *
4427          * Session Logout was requested.  iscsit_close_session() will be called
4428          * elsewhere.
4429          *
4430          * Session Continuation is not being performed, start the Time2Retain
4431          * handler and check if sleep_on_sess_wait_sem is active.
4432          */
4433         if (!atomic_read(&sess->session_reinstatement) &&
4434              atomic_read(&sess->session_fall_back_to_erl0)) {
4435                 spin_unlock_bh(&sess->conn_lock);
4436                 target_put_session(sess->se_sess);
4437
4438                 return 0;
4439         } else if (atomic_read(&sess->session_logout)) {
4440                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4441                 sess->session_state = TARG_SESS_STATE_FREE;
4442                 spin_unlock_bh(&sess->conn_lock);
4443
4444                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4445                         complete(&sess->session_wait_comp);
4446
4447                 return 0;
4448         } else {
4449                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4450                 sess->session_state = TARG_SESS_STATE_FAILED;
4451
4452                 if (!atomic_read(&sess->session_continuation)) {
4453                         spin_unlock_bh(&sess->conn_lock);
4454                         iscsit_start_time2retain_handler(sess);
4455                 } else
4456                         spin_unlock_bh(&sess->conn_lock);
4457
4458                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4459                         complete(&sess->session_wait_comp);
4460
4461                 return 0;
4462         }
4463         spin_unlock_bh(&sess->conn_lock);
4464
4465         return 0;
4466 }
4467
4468 int iscsit_close_session(struct iscsi_session *sess)
4469 {
4470         struct iscsi_portal_group *tpg = sess->tpg;
4471         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4472
4473         if (atomic_read(&sess->nconn)) {
4474                 pr_err("%d connection(s) still exist for iSCSI session"
4475                         " to %s\n", atomic_read(&sess->nconn),
4476                         sess->sess_ops->InitiatorName);
4477                 BUG();
4478         }
4479
4480         spin_lock_bh(&se_tpg->session_lock);
4481         atomic_set(&sess->session_logout, 1);
4482         atomic_set(&sess->session_reinstatement, 1);
4483         iscsit_stop_time2retain_timer(sess);
4484         spin_unlock_bh(&se_tpg->session_lock);
4485
4486         /*
4487          * transport_deregister_session_configfs() will clear the
4488          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4489          * can be setting it again with __transport_register_session() in
4490          * iscsi_post_login_handler() again after the iscsit_stop_session()
4491          * completes in iscsi_np context.
4492          */
4493         transport_deregister_session_configfs(sess->se_sess);
4494
4495         /*
4496          * If any other processes are accessing this session pointer we must
4497          * wait until they have completed.  If we are in an interrupt (the
4498          * time2retain handler) and contain and active session usage count we
4499          * restart the timer and exit.
4500          */
4501         if (!in_interrupt()) {
4502                 if (iscsit_check_session_usage_count(sess) == 1)
4503                         iscsit_stop_session(sess, 1, 1);
4504         } else {
4505                 if (iscsit_check_session_usage_count(sess) == 2) {
4506                         atomic_set(&sess->session_logout, 0);
4507                         iscsit_start_time2retain_handler(sess);
4508                         return 0;
4509                 }
4510         }
4511
4512         transport_deregister_session(sess->se_sess);
4513
4514         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4515                 iscsit_free_connection_recovery_entires(sess);
4516
4517         iscsit_free_all_ooo_cmdsns(sess);
4518
4519         spin_lock_bh(&se_tpg->session_lock);
4520         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4521         sess->session_state = TARG_SESS_STATE_FREE;
4522         pr_debug("Released iSCSI session from node: %s\n",
4523                         sess->sess_ops->InitiatorName);
4524         tpg->nsessions--;
4525         if (tpg->tpg_tiqn)
4526                 tpg->tpg_tiqn->tiqn_nsessions--;
4527
4528         pr_debug("Decremented number of active iSCSI Sessions on"
4529                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4530
4531         spin_lock(&sess_idr_lock);
4532         idr_remove(&sess_idr, sess->session_index);
4533         spin_unlock(&sess_idr_lock);
4534
4535         kfree(sess->sess_ops);
4536         sess->sess_ops = NULL;
4537         spin_unlock_bh(&se_tpg->session_lock);
4538
4539         kfree(sess);
4540         return 0;
4541 }
4542
4543 static void iscsit_logout_post_handler_closesession(
4544         struct iscsi_conn *conn)
4545 {
4546         struct iscsi_session *sess = conn->sess;
4547         int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4548
4549         atomic_set(&conn->conn_logout_remove, 0);
4550         complete(&conn->conn_logout_comp);
4551
4552         iscsit_dec_conn_usage_count(conn);
4553         iscsit_stop_session(sess, sleep, sleep);
4554         iscsit_dec_session_usage_count(sess);
4555         target_put_session(sess->se_sess);
4556 }
4557
4558 static void iscsit_logout_post_handler_samecid(
4559         struct iscsi_conn *conn)
4560 {
4561         int sleep = cmpxchg(&conn->tx_thread_active, true, false);
4562
4563         atomic_set(&conn->conn_logout_remove, 0);
4564         complete(&conn->conn_logout_comp);
4565
4566         iscsit_cause_connection_reinstatement(conn, sleep);
4567         iscsit_dec_conn_usage_count(conn);
4568 }
4569
4570 static void iscsit_logout_post_handler_diffcid(
4571         struct iscsi_conn *conn,
4572         u16 cid)
4573 {
4574         struct iscsi_conn *l_conn;
4575         struct iscsi_session *sess = conn->sess;
4576         bool conn_found = false;
4577
4578         if (!sess)
4579                 return;
4580
4581         spin_lock_bh(&sess->conn_lock);
4582         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4583                 if (l_conn->cid == cid) {
4584                         iscsit_inc_conn_usage_count(l_conn);
4585                         conn_found = true;
4586                         break;
4587                 }
4588         }
4589         spin_unlock_bh(&sess->conn_lock);
4590
4591         if (!conn_found)
4592                 return;
4593
4594         if (l_conn->sock)
4595                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4596
4597         spin_lock_bh(&l_conn->state_lock);
4598         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4599         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4600         spin_unlock_bh(&l_conn->state_lock);
4601
4602         iscsit_cause_connection_reinstatement(l_conn, 1);
4603         iscsit_dec_conn_usage_count(l_conn);
4604 }
4605
4606 /*
4607  *      Return of 0 causes the TX thread to restart.
4608  */
4609 int iscsit_logout_post_handler(
4610         struct iscsi_cmd *cmd,
4611         struct iscsi_conn *conn)
4612 {
4613         int ret = 0;
4614
4615         switch (cmd->logout_reason) {
4616         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4617                 switch (cmd->logout_response) {
4618                 case ISCSI_LOGOUT_SUCCESS:
4619                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4620                 default:
4621                         iscsit_logout_post_handler_closesession(conn);
4622                         break;
4623                 }
4624                 ret = 0;
4625                 break;
4626         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4627                 if (conn->cid == cmd->logout_cid) {
4628                         switch (cmd->logout_response) {
4629                         case ISCSI_LOGOUT_SUCCESS:
4630                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4631                         default:
4632                                 iscsit_logout_post_handler_samecid(conn);
4633                                 break;
4634                         }
4635                         ret = 0;
4636                 } else {
4637                         switch (cmd->logout_response) {
4638                         case ISCSI_LOGOUT_SUCCESS:
4639                                 iscsit_logout_post_handler_diffcid(conn,
4640                                         cmd->logout_cid);
4641                                 break;
4642                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4643                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4644                         default:
4645                                 break;
4646                         }
4647                         ret = 1;
4648                 }
4649                 break;
4650         case ISCSI_LOGOUT_REASON_RECOVERY:
4651                 switch (cmd->logout_response) {
4652                 case ISCSI_LOGOUT_SUCCESS:
4653                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4654                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4655                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4656                 default:
4657                         break;
4658                 }
4659                 ret = 1;
4660                 break;
4661         default:
4662                 break;
4663
4664         }
4665         return ret;
4666 }
4667 EXPORT_SYMBOL(iscsit_logout_post_handler);
4668
4669 void iscsit_fail_session(struct iscsi_session *sess)
4670 {
4671         struct iscsi_conn *conn;
4672
4673         spin_lock_bh(&sess->conn_lock);
4674         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4675                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4676                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4677         }
4678         spin_unlock_bh(&sess->conn_lock);
4679
4680         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4681         sess->session_state = TARG_SESS_STATE_FAILED;
4682 }
4683
4684 int iscsit_free_session(struct iscsi_session *sess)
4685 {
4686         u16 conn_count = atomic_read(&sess->nconn);
4687         struct iscsi_conn *conn, *conn_tmp = NULL;
4688         int is_last;
4689
4690         spin_lock_bh(&sess->conn_lock);
4691         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4692
4693         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4694                         conn_list) {
4695                 if (conn_count == 0)
4696                         break;
4697
4698                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4699                         is_last = 1;
4700                 } else {
4701                         iscsit_inc_conn_usage_count(conn_tmp);
4702                         is_last = 0;
4703                 }
4704                 iscsit_inc_conn_usage_count(conn);
4705
4706                 spin_unlock_bh(&sess->conn_lock);
4707                 iscsit_cause_connection_reinstatement(conn, 1);
4708                 spin_lock_bh(&sess->conn_lock);
4709
4710                 iscsit_dec_conn_usage_count(conn);
4711                 if (is_last == 0)
4712                         iscsit_dec_conn_usage_count(conn_tmp);
4713
4714                 conn_count--;
4715         }
4716
4717         if (atomic_read(&sess->nconn)) {
4718                 spin_unlock_bh(&sess->conn_lock);
4719                 wait_for_completion(&sess->session_wait_comp);
4720         } else
4721                 spin_unlock_bh(&sess->conn_lock);
4722
4723         target_put_session(sess->se_sess);
4724         return 0;
4725 }
4726
4727 void iscsit_stop_session(
4728         struct iscsi_session *sess,
4729         int session_sleep,
4730         int connection_sleep)
4731 {
4732         u16 conn_count = atomic_read(&sess->nconn);
4733         struct iscsi_conn *conn, *conn_tmp = NULL;
4734         int is_last;
4735
4736         spin_lock_bh(&sess->conn_lock);
4737         if (session_sleep)
4738                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4739
4740         if (connection_sleep) {
4741                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4742                                 conn_list) {
4743                         if (conn_count == 0)
4744                                 break;
4745
4746                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4747                                 is_last = 1;
4748                         } else {
4749                                 iscsit_inc_conn_usage_count(conn_tmp);
4750                                 is_last = 0;
4751                         }
4752                         iscsit_inc_conn_usage_count(conn);
4753
4754                         spin_unlock_bh(&sess->conn_lock);
4755                         iscsit_cause_connection_reinstatement(conn, 1);
4756                         spin_lock_bh(&sess->conn_lock);
4757
4758                         iscsit_dec_conn_usage_count(conn);
4759                         if (is_last == 0)
4760                                 iscsit_dec_conn_usage_count(conn_tmp);
4761                         conn_count--;
4762                 }
4763         } else {
4764                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4765                         iscsit_cause_connection_reinstatement(conn, 0);
4766         }
4767
4768         if (session_sleep && atomic_read(&sess->nconn)) {
4769                 spin_unlock_bh(&sess->conn_lock);
4770                 wait_for_completion(&sess->session_wait_comp);
4771         } else
4772                 spin_unlock_bh(&sess->conn_lock);
4773 }
4774
4775 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4776 {
4777         struct iscsi_session *sess;
4778         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4779         struct se_session *se_sess, *se_sess_tmp;
4780         int session_count = 0;
4781
4782         spin_lock_bh(&se_tpg->session_lock);
4783         if (tpg->nsessions && !force) {
4784                 spin_unlock_bh(&se_tpg->session_lock);
4785                 return -1;
4786         }
4787
4788         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4789                         sess_list) {
4790                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4791
4792                 spin_lock(&sess->conn_lock);
4793                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4794                     atomic_read(&sess->session_logout) ||
4795                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4796                         spin_unlock(&sess->conn_lock);
4797                         continue;
4798                 }
4799                 atomic_set(&sess->session_reinstatement, 1);
4800                 spin_unlock(&sess->conn_lock);
4801                 spin_unlock_bh(&se_tpg->session_lock);
4802
4803                 iscsit_free_session(sess);
4804                 spin_lock_bh(&se_tpg->session_lock);
4805
4806                 session_count++;
4807         }
4808         spin_unlock_bh(&se_tpg->session_lock);
4809
4810         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4811                         " Group: %hu\n", session_count, tpg->tpgt);
4812         return 0;
4813 }
4814
4815 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4816 MODULE_VERSION("4.1.x");
4817 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4818 MODULE_LICENSE("GPL");
4819
4820 module_init(iscsi_target_init_module);
4821 module_exit(iscsi_target_cleanup_module);