drivers/target/iscsi/iscsi_target.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains main functions related to the iSCSI Target Core Driver.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10
  11 #include <crypto/hash.h>
  12 #include <linux/string.h>
  13 #include <linux/kthread.h>
  14 #include <linux/completion.h>
  15 #include <linux/module.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/idr.h>
  18 #include <linux/delay.h>
  19 #include <linux/sched/signal.h>
  20 #include <asm/unaligned.h>
  21 #include <linux/inet.h>
  22 #include <net/ipv6.h>
  23 #include <scsi/scsi_proto.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <scsi/scsi_tcq.h>
  26 #include <target/target_core_base.h>
  27 #include <target/target_core_fabric.h>
  28
  29 #include <target/iscsi/iscsi_target_core.h>
  30 #include "iscsi_target_parameters.h"
  31 #include "iscsi_target_seq_pdu_list.h"
  32 #include "iscsi_target_datain_values.h"
  33 #include "iscsi_target_erl0.h"
  34 #include "iscsi_target_erl1.h"
  35 #include "iscsi_target_erl2.h"
  36 #include "iscsi_target_login.h"
  37 #include "iscsi_target_tmr.h"
  38 #include "iscsi_target_tpg.h"
  39 #include "iscsi_target_util.h"
  40 #include "iscsi_target.h"
  41 #include "iscsi_target_device.h"
  42 #include <target/iscsi/iscsi_target_stat.h>
  43
  44 #include <target/iscsi/iscsi_transport.h>
  45
  46 static LIST_HEAD(g_tiqn_list);
  47 static LIST_HEAD(g_np_list);
  48 static DEFINE_SPINLOCK(tiqn_lock);
  49 static DEFINE_MUTEX(np_lock);
  50
  51 static struct idr tiqn_idr;
  52 DEFINE_IDA(sess_ida);
  53 struct mutex auth_id_lock;
  54
  55 struct iscsit_global *iscsit_global;
  56
  57 struct kmem_cache *lio_qr_cache;
  58 struct kmem_cache *lio_dr_cache;
  59 struct kmem_cache *lio_ooo_cache;
  60 struct kmem_cache *lio_r2t_cache;
  61
  62 static int iscsit_handle_immediate_data(struct iscsit_cmd *,
  63                         struct iscsi_scsi_req *, u32);
  64
  65 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  66 {
  67         struct iscsi_tiqn *tiqn = NULL;
  68
  69         spin_lock(&tiqn_lock);
  70         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  71                 if (!strcmp(tiqn->tiqn, buf)) {
  72
  73                         spin_lock(&tiqn->tiqn_state_lock);
  74                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  75                                 tiqn->tiqn_access_count++;
  76                                 spin_unlock(&tiqn->tiqn_state_lock);
  77                                 spin_unlock(&tiqn_lock);
  78                                 return tiqn;
  79                         }
  80                         spin_unlock(&tiqn->tiqn_state_lock);
  81                 }
  82         }
  83         spin_unlock(&tiqn_lock);
  84
  85         return NULL;
  86 }
  87
  88 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  89 {
  90         spin_lock(&tiqn->tiqn_state_lock);
  91         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  92                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  93                 spin_unlock(&tiqn->tiqn_state_lock);
  94                 return 0;
  95         }
  96         spin_unlock(&tiqn->tiqn_state_lock);
  97
  98         return -1;
  99 }
 100
 101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 102 {
 103         spin_lock(&tiqn->tiqn_state_lock);
 104         tiqn->tiqn_access_count--;
 105         spin_unlock(&tiqn->tiqn_state_lock);
 106 }
 107
 108 /*
 109  * Note that IQN formatting is expected to be done in userspace, and
 110  * no explict IQN format checks are done here.
 111  */
 112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 113 {
 114         struct iscsi_tiqn *tiqn = NULL;
 115         int ret;
 116
 117         if (strlen(buf) >= ISCSI_IQN_LEN) {
 118                 pr_err("Target IQN exceeds %d bytes\n",
 119                                 ISCSI_IQN_LEN);
 120                 return ERR_PTR(-EINVAL);
 121         }
 122
 123         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 124         if (!tiqn)
 125                 return ERR_PTR(-ENOMEM);
 126
 127         sprintf(tiqn->tiqn, "%s", buf);
 128         INIT_LIST_HEAD(&tiqn->tiqn_list);
 129         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 130         spin_lock_init(&tiqn->tiqn_state_lock);
 131         spin_lock_init(&tiqn->tiqn_tpg_lock);
 132         spin_lock_init(&tiqn->sess_err_stats.lock);
 133         spin_lock_init(&tiqn->login_stats.lock);
 134         spin_lock_init(&tiqn->logout_stats.lock);
 135
 136         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 137
 138         idr_preload(GFP_KERNEL);
 139         spin_lock(&tiqn_lock);
 140
 141         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 142         if (ret < 0) {
 143                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 144                 spin_unlock(&tiqn_lock);
 145                 idr_preload_end();
 146                 kfree(tiqn);
 147                 return ERR_PTR(ret);
 148         }
 149         tiqn->tiqn_index = ret;
 150         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 151
 152         spin_unlock(&tiqn_lock);
 153         idr_preload_end();
 154
 155         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 156
 157         return tiqn;
 158
 159 }
 160
 161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 162 {
 163         /*
 164          * Wait for accesses to said struct iscsi_tiqn to end.
 165          */
 166         spin_lock(&tiqn->tiqn_state_lock);
 167         while (tiqn->tiqn_access_count != 0) {
 168                 spin_unlock(&tiqn->tiqn_state_lock);
 169                 msleep(10);
 170                 spin_lock(&tiqn->tiqn_state_lock);
 171         }
 172         spin_unlock(&tiqn->tiqn_state_lock);
 173 }
 174
 175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 176 {
 177         /*
 178          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 179          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 180          * attempts to access this struct iscsi_tiqn will fail from both transport
 181          * fabric and control code paths.
 182          */
 183         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 184                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 185                 return;
 186         }
 187
 188         iscsit_wait_for_tiqn(tiqn);
 189
 190         spin_lock(&tiqn_lock);
 191         list_del(&tiqn->tiqn_list);
 192         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 193         spin_unlock(&tiqn_lock);
 194
 195         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 196                         tiqn->tiqn);
 197         kfree(tiqn);
 198 }
 199
 200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 201 {
 202         int ret;
 203         /*
 204          * Determine if the network portal is accepting storage traffic.
 205          */
 206         spin_lock_bh(&np->np_thread_lock);
 207         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 208                 spin_unlock_bh(&np->np_thread_lock);
 209                 return -1;
 210         }
 211         spin_unlock_bh(&np->np_thread_lock);
 212         /*
 213          * Determine if the portal group is accepting storage traffic.
 214          */
 215         spin_lock_bh(&tpg->tpg_state_lock);
 216         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 217                 spin_unlock_bh(&tpg->tpg_state_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&tpg->tpg_state_lock);
 221
 222         /*
 223          * Here we serialize access across the TIQN+TPG Tuple.
 224          */
 225         ret = down_interruptible(&tpg->np_login_sem);
 226         if (ret != 0)
 227                 return -1;
 228
 229         spin_lock_bh(&tpg->tpg_state_lock);
 230         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 231                 spin_unlock_bh(&tpg->tpg_state_lock);
 232                 up(&tpg->np_login_sem);
 233                 return -1;
 234         }
 235         spin_unlock_bh(&tpg->tpg_state_lock);
 236
 237         return 0;
 238 }
 239
 240 void iscsit_login_kref_put(struct kref *kref)
 241 {
 242         struct iscsi_tpg_np *tpg_np = container_of(kref,
 243                                 struct iscsi_tpg_np, tpg_np_kref);
 244
 245         complete(&tpg_np->tpg_np_comp);
 246 }
 247
 248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 249                        struct iscsi_tpg_np *tpg_np)
 250 {
 251         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 252
 253         up(&tpg->np_login_sem);
 254
 255         if (tpg_np)
 256                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 257
 258         if (tiqn)
 259                 iscsit_put_tiqn_for_login(tiqn);
 260
 261         return 0;
 262 }
 263
 264 bool iscsit_check_np_match(
 265         struct sockaddr_storage *sockaddr,
 266         struct iscsi_np *np,
 267         int network_transport)
 268 {
 269         struct sockaddr_in *sock_in, *sock_in_e;
 270         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 271         bool ip_match = false;
 272         u16 port, port_e;
 273
 274         if (sockaddr->ss_family == AF_INET6) {
 275                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 276                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 277
 278                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 279                             &sock_in6_e->sin6_addr.in6_u,
 280                             sizeof(struct in6_addr)))
 281                         ip_match = true;
 282
 283                 port = ntohs(sock_in6->sin6_port);
 284                 port_e = ntohs(sock_in6_e->sin6_port);
 285         } else {
 286                 sock_in = (struct sockaddr_in *)sockaddr;
 287                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 288
 289                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in->sin_port);
 293                 port_e = ntohs(sock_in_e->sin_port);
 294         }
 295
 296         if (ip_match && (port_e == port) &&
 297             (np->np_network_transport == network_transport))
 298                 return true;
 299
 300         return false;
 301 }
 302
 303 static struct iscsi_np *iscsit_get_np(
 304         struct sockaddr_storage *sockaddr,
 305         int network_transport)
 306 {
 307         struct iscsi_np *np;
 308         bool match;
 309
 310         lockdep_assert_held(&np_lock);
 311
 312         list_for_each_entry(np, &g_np_list, np_list) {
 313                 spin_lock_bh(&np->np_thread_lock);
 314                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 315                         spin_unlock_bh(&np->np_thread_lock);
 316                         continue;
 317                 }
 318
 319                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 320                 if (match) {
 321                         /*
 322                          * Increment the np_exports reference count now to
 323                          * prevent iscsit_del_np() below from being called
 324                          * while iscsi_tpg_add_network_portal() is called.
 325                          */
 326                         np->np_exports++;
 327                         spin_unlock_bh(&np->np_thread_lock);
 328                         return np;
 329                 }
 330                 spin_unlock_bh(&np->np_thread_lock);
 331         }
 332
 333         return NULL;
 334 }
 335
 336 struct iscsi_np *iscsit_add_np(
 337         struct sockaddr_storage *sockaddr,
 338         int network_transport)
 339 {
 340         struct iscsi_np *np;
 341         int ret;
 342
 343         mutex_lock(&np_lock);
 344
 345         /*
 346          * Locate the existing struct iscsi_np if already active..
 347          */
 348         np = iscsit_get_np(sockaddr, network_transport);
 349         if (np) {
 350                 mutex_unlock(&np_lock);
 351                 return np;
 352         }
 353
 354         np = kzalloc(sizeof(*np), GFP_KERNEL);
 355         if (!np) {
 356                 mutex_unlock(&np_lock);
 357                 return ERR_PTR(-ENOMEM);
 358         }
 359
 360         np->np_flags |= NPF_IP_NETWORK;
 361         np->np_network_transport = network_transport;
 362         spin_lock_init(&np->np_thread_lock);
 363         init_completion(&np->np_restart_comp);
 364         INIT_LIST_HEAD(&np->np_list);
 365
 366         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 367
 368         ret = iscsi_target_setup_login_socket(np, sockaddr);
 369         if (ret != 0) {
 370                 kfree(np);
 371                 mutex_unlock(&np_lock);
 372                 return ERR_PTR(ret);
 373         }
 374
 375         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 376         if (IS_ERR(np->np_thread)) {
 377                 pr_err("Unable to create kthread: iscsi_np\n");
 378                 ret = PTR_ERR(np->np_thread);
 379                 kfree(np);
 380                 mutex_unlock(&np_lock);
 381                 return ERR_PTR(ret);
 382         }
 383         /*
 384          * Increment the np_exports reference count now to prevent
 385          * iscsit_del_np() below from being run while a new call to
 386          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 387          * active.  We don't need to hold np->np_thread_lock at this
 388          * point because iscsi_np has not been added to g_np_list yet.
 389          */
 390         np->np_exports = 1;
 391         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 392
 393         list_add_tail(&np->np_list, &g_np_list);
 394         mutex_unlock(&np_lock);
 395
 396         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 397                 &np->np_sockaddr, np->np_transport->name);
 398
 399         return np;
 400 }
 401
 402 int iscsit_reset_np_thread(
 403         struct iscsi_np *np,
 404         struct iscsi_tpg_np *tpg_np,
 405         struct iscsi_portal_group *tpg,
 406         bool shutdown)
 407 {
 408         spin_lock_bh(&np->np_thread_lock);
 409         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 410                 spin_unlock_bh(&np->np_thread_lock);
 411                 return 0;
 412         }
 413         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 414         atomic_inc(&np->np_reset_count);
 415
 416         if (np->np_thread) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 send_sig(SIGINT, np->np_thread, 1);
 419                 wait_for_completion(&np->np_restart_comp);
 420                 spin_lock_bh(&np->np_thread_lock);
 421         }
 422         spin_unlock_bh(&np->np_thread_lock);
 423
 424         if (tpg_np && shutdown) {
 425                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 426
 427                 wait_for_completion(&tpg_np->tpg_np_comp);
 428         }
 429
 430         return 0;
 431 }
 432
 433 static void iscsit_free_np(struct iscsi_np *np)
 434 {
 435         if (np->np_socket)
 436                 sock_release(np->np_socket);
 437 }
 438
 439 int iscsit_del_np(struct iscsi_np *np)
 440 {
 441         spin_lock_bh(&np->np_thread_lock);
 442         np->np_exports--;
 443         if (np->np_exports) {
 444                 np->enabled = true;
 445                 spin_unlock_bh(&np->np_thread_lock);
 446                 return 0;
 447         }
 448         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 449         spin_unlock_bh(&np->np_thread_lock);
 450
 451         if (np->np_thread) {
 452                 /*
 453                  * We need to send the signal to wakeup Linux/Net
 454                  * which may be sleeping in sock_accept()..
 455                  */
 456                 send_sig(SIGINT, np->np_thread, 1);
 457                 kthread_stop(np->np_thread);
 458                 np->np_thread = NULL;
 459         }
 460
 461         np->np_transport->iscsit_free_np(np);
 462
 463         mutex_lock(&np_lock);
 464         list_del(&np->np_list);
 465         mutex_unlock(&np_lock);
 466
 467         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 468                 &np->np_sockaddr, np->np_transport->name);
 469
 470         iscsit_put_transport(np->np_transport);
 471         kfree(np);
 472         return 0;
 473 }
 474
 475 static void iscsit_get_rx_pdu(struct iscsit_conn *);
 476
 477 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
 478 {
 479         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 480 }
 481 EXPORT_SYMBOL(iscsit_queue_rsp);
 482
 483 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
 484 {
 485         spin_lock_bh(&conn->cmd_lock);
 486         if (!list_empty(&cmd->i_conn_node))
 487                 list_del_init(&cmd->i_conn_node);
 488         spin_unlock_bh(&conn->cmd_lock);
 489
 490         __iscsit_free_cmd(cmd, true);
 491 }
 492 EXPORT_SYMBOL(iscsit_aborted_task);
 493
 494 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 495                                       u32, u32, const void *, void *);
 496 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *);
 497
 498 static int
 499 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 500                           const void *data_buf, u32 data_buf_len)
 501 {
 502         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 503         struct kvec *iov;
 504         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 505         int ret;
 506
 507         iov = &cmd->iov_misc[0];
 508         iov[niov].iov_base      = cmd->pdu;
 509         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 510
 511         if (conn->conn_ops->HeaderDigest) {
 512                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 513
 514                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 515                                           ISCSI_HDR_LEN, 0, NULL,
 516                                           header_digest);
 517
 518                 iov[0].iov_len += ISCSI_CRC_LEN;
 519                 tx_size += ISCSI_CRC_LEN;
 520                 pr_debug("Attaching CRC32C HeaderDigest"
 521                          " to opcode 0x%x 0x%08x\n",
 522                          hdr->opcode, *header_digest);
 523         }
 524
 525         if (data_buf_len) {
 526                 u32 padding = ((-data_buf_len) & 3);
 527
 528                 iov[niov].iov_base      = (void *)data_buf;
 529                 iov[niov++].iov_len     = data_buf_len;
 530                 tx_size += data_buf_len;
 531
 532                 if (padding != 0) {
 533                         iov[niov].iov_base = &cmd->pad_bytes;
 534                         iov[niov++].iov_len = padding;
 535                         tx_size += padding;
 536                         pr_debug("Attaching %u additional"
 537                                  " padding bytes.\n", padding);
 538                 }
 539
 540                 if (conn->conn_ops->DataDigest) {
 541                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 542                                                   data_buf, data_buf_len,
 543                                                   padding, &cmd->pad_bytes,
 544                                                   &cmd->data_crc);
 545
 546                         iov[niov].iov_base = &cmd->data_crc;
 547                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 548                         tx_size += ISCSI_CRC_LEN;
 549                         pr_debug("Attached DataDigest for %u"
 550                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 551                                  data_buf_len, hdr->opcode, cmd->data_crc);
 552                 }
 553         }
 554
 555         cmd->iov_misc_count = niov;
 556         cmd->tx_size = tx_size;
 557
 558         ret = iscsit_send_tx_data(cmd, conn, 1);
 559         if (ret < 0) {
 560                 iscsit_tx_thread_wait_for_tcp(conn);
 561                 return ret;
 562         }
 563
 564         return 0;
 565 }
 566
 567 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
 568                             u32 data_offset, u32 data_length);
 569 static void iscsit_unmap_iovec(struct iscsit_cmd *);
 570 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *,
 571                                     u32, u32, u32, u8 *);
 572 static int
 573 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 574                        const struct iscsi_datain *datain)
 575 {
 576         struct kvec *iov;
 577         u32 iov_count = 0, tx_size = 0;
 578         int ret, iov_ret;
 579
 580         iov = &cmd->iov_data[0];
 581         iov[iov_count].iov_base = cmd->pdu;
 582         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 583         tx_size += ISCSI_HDR_LEN;
 584
 585         if (conn->conn_ops->HeaderDigest) {
 586                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 587
 588                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 589                                           ISCSI_HDR_LEN, 0, NULL,
 590                                           header_digest);
 591
 592                 iov[0].iov_len += ISCSI_CRC_LEN;
 593                 tx_size += ISCSI_CRC_LEN;
 594
 595                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 596                          *header_digest);
 597         }
 598
 599         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
 600                                    cmd->orig_iov_data_count - (iov_count + 2),
 601                                    datain->offset, datain->length);
 602         if (iov_ret < 0)
 603                 return -1;
 604
 605         iov_count += iov_ret;
 606         tx_size += datain->length;
 607
 608         cmd->padding = ((-datain->length) & 3);
 609         if (cmd->padding) {
 610                 iov[iov_count].iov_base         = cmd->pad_bytes;
 611                 iov[iov_count++].iov_len        = cmd->padding;
 612                 tx_size += cmd->padding;
 613
 614                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 615         }
 616
 617         if (conn->conn_ops->DataDigest) {
 618                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 619                                                          cmd, datain->offset,
 620                                                          datain->length,
 621                                                          cmd->padding,
 622                                                          cmd->pad_bytes);
 623
 624                 iov[iov_count].iov_base = &cmd->data_crc;
 625                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 626                 tx_size += ISCSI_CRC_LEN;
 627
 628                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 629                          datain->length + cmd->padding, cmd->data_crc);
 630         }
 631
 632         cmd->iov_data_count = iov_count;
 633         cmd->tx_size = tx_size;
 634
 635         ret = iscsit_fe_sendpage_sg(cmd, conn);
 636
 637         iscsit_unmap_iovec(cmd);
 638
 639         if (ret < 0) {
 640                 iscsit_tx_thread_wait_for_tcp(conn);
 641                 return ret;
 642         }
 643
 644         return 0;
 645 }
 646
 647 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 648                            struct iscsi_datain_req *dr, const void *buf,
 649                            u32 buf_len)
 650 {
 651         if (dr)
 652                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 653         else
 654                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 655 }
 656
 657 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn)
 658 {
 659         return TARGET_PROT_NORMAL;
 660 }
 661
 662 static struct iscsit_transport iscsi_target_transport = {
 663         .name                   = "iSCSI/TCP",
 664         .transport_type         = ISCSI_TCP,
 665         .rdma_shutdown          = false,
 666         .owner                  = NULL,
 667         .iscsit_setup_np        = iscsit_setup_np,
 668         .iscsit_accept_np       = iscsit_accept_np,
 669         .iscsit_free_np         = iscsit_free_np,
 670         .iscsit_get_login_rx    = iscsit_get_login_rx,
 671         .iscsit_put_login_tx    = iscsit_put_login_tx,
 672         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 673         .iscsit_immediate_queue = iscsit_immediate_queue,
 674         .iscsit_response_queue  = iscsit_response_queue,
 675         .iscsit_queue_data_in   = iscsit_queue_rsp,
 676         .iscsit_queue_status    = iscsit_queue_rsp,
 677         .iscsit_aborted_task    = iscsit_aborted_task,
 678         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 679         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 680         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 681 };
 682
 683 static int __init iscsi_target_init_module(void)
 684 {
 685         int ret = 0, size;
 686
 687         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 688         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 689         if (!iscsit_global)
 690                 return -1;
 691
 692         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 693         mutex_init(&auth_id_lock);
 694         idr_init(&tiqn_idr);
 695
 696         ret = target_register_template(&iscsi_ops);
 697         if (ret)
 698                 goto out;
 699
 700         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 701         iscsit_global->ts_bitmap = vzalloc(size);
 702         if (!iscsit_global->ts_bitmap)
 703                 goto configfs_out;
 704
 705         if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) {
 706                 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n");
 707                 goto bitmap_out;
 708         }
 709         cpumask_setall(iscsit_global->allowed_cpumask);
 710
 711         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 712                         sizeof(struct iscsi_queue_req),
 713                         __alignof__(struct iscsi_queue_req), 0, NULL);
 714         if (!lio_qr_cache) {
 715                 pr_err("Unable to kmem_cache_create() for"
 716                                 " lio_qr_cache\n");
 717                 goto cpumask_out;
 718         }
 719
 720         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 721                         sizeof(struct iscsi_datain_req),
 722                         __alignof__(struct iscsi_datain_req), 0, NULL);
 723         if (!lio_dr_cache) {
 724                 pr_err("Unable to kmem_cache_create() for"
 725                                 " lio_dr_cache\n");
 726                 goto qr_out;
 727         }
 728
 729         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 730                         sizeof(struct iscsi_ooo_cmdsn),
 731                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 732         if (!lio_ooo_cache) {
 733                 pr_err("Unable to kmem_cache_create() for"
 734                                 " lio_ooo_cache\n");
 735                 goto dr_out;
 736         }
 737
 738         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 739                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 740                         0, NULL);
 741         if (!lio_r2t_cache) {
 742                 pr_err("Unable to kmem_cache_create() for"
 743                                 " lio_r2t_cache\n");
 744                 goto ooo_out;
 745         }
 746
 747         iscsit_register_transport(&iscsi_target_transport);
 748
 749         if (iscsit_load_discovery_tpg() < 0)
 750                 goto r2t_out;
 751
 752         return ret;
 753 r2t_out:
 754         iscsit_unregister_transport(&iscsi_target_transport);
 755         kmem_cache_destroy(lio_r2t_cache);
 756 ooo_out:
 757         kmem_cache_destroy(lio_ooo_cache);
 758 dr_out:
 759         kmem_cache_destroy(lio_dr_cache);
 760 qr_out:
 761         kmem_cache_destroy(lio_qr_cache);
 762 cpumask_out:
 763         free_cpumask_var(iscsit_global->allowed_cpumask);
 764 bitmap_out:
 765         vfree(iscsit_global->ts_bitmap);
 766 configfs_out:
 767         /* XXX: this probably wants it to be it's own unwind step.. */
 768         if (iscsit_global->discovery_tpg)
 769                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 770         target_unregister_template(&iscsi_ops);
 771 out:
 772         kfree(iscsit_global);
 773         return -ENOMEM;
 774 }
 775
 776 static void __exit iscsi_target_cleanup_module(void)
 777 {
 778         iscsit_release_discovery_tpg();
 779         iscsit_unregister_transport(&iscsi_target_transport);
 780         kmem_cache_destroy(lio_qr_cache);
 781         kmem_cache_destroy(lio_dr_cache);
 782         kmem_cache_destroy(lio_ooo_cache);
 783         kmem_cache_destroy(lio_r2t_cache);
 784
 785         /*
 786          * Shutdown discovery sessions and disable discovery TPG
 787          */
 788         if (iscsit_global->discovery_tpg)
 789                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 790
 791         target_unregister_template(&iscsi_ops);
 792
 793         free_cpumask_var(iscsit_global->allowed_cpumask);
 794         vfree(iscsit_global->ts_bitmap);
 795         kfree(iscsit_global);
 796 }
 797
 798 int iscsit_add_reject(
 799         struct iscsit_conn *conn,
 800         u8 reason,
 801         unsigned char *buf)
 802 {
 803         struct iscsit_cmd *cmd;
 804
 805         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 806         if (!cmd)
 807                 return -1;
 808
 809         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 810         cmd->reject_reason = reason;
 811
 812         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 813         if (!cmd->buf_ptr) {
 814                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 815                 iscsit_free_cmd(cmd, false);
 816                 return -1;
 817         }
 818
 819         spin_lock_bh(&conn->cmd_lock);
 820         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 821         spin_unlock_bh(&conn->cmd_lock);
 822
 823         cmd->i_state = ISTATE_SEND_REJECT;
 824         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 825
 826         return -1;
 827 }
 828 EXPORT_SYMBOL(iscsit_add_reject);
 829
 830 static int iscsit_add_reject_from_cmd(
 831         struct iscsit_cmd *cmd,
 832         u8 reason,
 833         bool add_to_conn,
 834         unsigned char *buf)
 835 {
 836         struct iscsit_conn *conn;
 837         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 838
 839         if (!cmd->conn) {
 840                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 841                                 cmd->init_task_tag);
 842                 return -1;
 843         }
 844         conn = cmd->conn;
 845
 846         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 847         cmd->reject_reason = reason;
 848
 849         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 850         if (!cmd->buf_ptr) {
 851                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 852                 iscsit_free_cmd(cmd, false);
 853                 return -1;
 854         }
 855
 856         if (add_to_conn) {
 857                 spin_lock_bh(&conn->cmd_lock);
 858                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 859                 spin_unlock_bh(&conn->cmd_lock);
 860         }
 861
 862         cmd->i_state = ISTATE_SEND_REJECT;
 863         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 864         /*
 865          * Perform the kref_put now if se_cmd has already been setup by
 866          * scsit_setup_scsi_cmd()
 867          */
 868         if (do_put) {
 869                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 870                 target_put_sess_cmd(&cmd->se_cmd);
 871         }
 872         return -1;
 873 }
 874
 875 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason,
 876                                  unsigned char *buf)
 877 {
 878         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 879 }
 880
 881 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf)
 882 {
 883         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 884 }
 885 EXPORT_SYMBOL(iscsit_reject_cmd);
 886
 887 /*
 888  * Map some portion of the allocated scatterlist to an iovec, suitable for
 889  * kernel sockets to copy data in/out.
 890  */
 891 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
 892                             u32 data_offset, u32 data_length)
 893 {
 894         u32 i = 0, orig_data_length = data_length;
 895         struct scatterlist *sg;
 896         unsigned int page_off;
 897
 898         /*
 899          * We know each entry in t_data_sg contains a page.
 900          */
 901         u32 ent = data_offset / PAGE_SIZE;
 902
 903         if (!data_length)
 904                 return 0;
 905
 906         if (ent >= cmd->se_cmd.t_data_nents) {
 907                 pr_err("Initial page entry out-of-bounds\n");
 908                 goto overflow;
 909         }
 910
 911         sg = &cmd->se_cmd.t_data_sg[ent];
 912         page_off = (data_offset % PAGE_SIZE);
 913
 914         cmd->first_data_sg = sg;
 915         cmd->first_data_sg_off = page_off;
 916
 917         while (data_length) {
 918                 u32 cur_len;
 919
 920                 if (WARN_ON_ONCE(!sg || i >= nvec))
 921                         goto overflow;
 922
 923                 cur_len = min_t(u32, data_length, sg->length - page_off);
 924
 925                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 926                 iov[i].iov_len = cur_len;
 927
 928                 data_length -= cur_len;
 929                 page_off = 0;
 930                 sg = sg_next(sg);
 931                 i++;
 932         }
 933
 934         cmd->kmapped_nents = i;
 935
 936         return i;
 937
 938 overflow:
 939         pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
 940                data_offset, orig_data_length, i, nvec);
 941         for_each_sg(cmd->se_cmd.t_data_sg, sg,
 942                     cmd->se_cmd.t_data_nents, i) {
 943                 pr_err("[%d] off %d len %d\n",
 944                        i, sg->offset, sg->length);
 945         }
 946         return -1;
 947 }
 948
 949 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd)
 950 {
 951         u32 i;
 952         struct scatterlist *sg;
 953
 954         sg = cmd->first_data_sg;
 955
 956         for (i = 0; i < cmd->kmapped_nents; i++)
 957                 kunmap(sg_page(&sg[i]));
 958 }
 959
 960 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn)
 961 {
 962         LIST_HEAD(ack_list);
 963         struct iscsit_cmd *cmd, *cmd_p;
 964
 965         conn->exp_statsn = exp_statsn;
 966
 967         if (conn->sess->sess_ops->RDMAExtensions)
 968                 return;
 969
 970         spin_lock_bh(&conn->cmd_lock);
 971         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 972                 spin_lock(&cmd->istate_lock);
 973                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 974                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 975                         cmd->i_state = ISTATE_REMOVE;
 976                         spin_unlock(&cmd->istate_lock);
 977                         list_move_tail(&cmd->i_conn_node, &ack_list);
 978                         continue;
 979                 }
 980                 spin_unlock(&cmd->istate_lock);
 981         }
 982         spin_unlock_bh(&conn->cmd_lock);
 983
 984         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 985                 list_del_init(&cmd->i_conn_node);
 986                 iscsit_free_cmd(cmd, false);
 987         }
 988 }
 989
 990 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd)
 991 {
 992         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 993
 994         iov_count += ISCSI_IOV_DATA_BUFFER;
 995         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 996         if (!cmd->iov_data)
 997                 return -ENOMEM;
 998
 999         cmd->orig_iov_data_count = iov_count;
1000         return 0;
1001 }
1002
1003 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1004                           unsigned char *buf)
1005 {
1006         int data_direction, payload_length;
1007         struct iscsi_ecdb_ahdr *ecdb_ahdr;
1008         struct iscsi_scsi_req *hdr;
1009         int iscsi_task_attr;
1010         unsigned char *cdb;
1011         int sam_task_attr;
1012
1013         atomic_long_inc(&conn->sess->cmd_pdus);
1014
1015         hdr                     = (struct iscsi_scsi_req *) buf;
1016         payload_length          = ntoh24(hdr->dlength);
1017
1018         /* FIXME; Add checks for AdditionalHeaderSegment */
1019
1020         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1021             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1022                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1023                                 " not set. Bad iSCSI Initiator.\n");
1024                 return iscsit_add_reject_cmd(cmd,
1025                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1026         }
1027
1028         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1029              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1030                 /*
1031                  * From RFC-3720 Section 10.3.1:
1032                  *
1033                  * "Either or both of R and W MAY be 1 when either the
1034                  *  Expected Data Transfer Length and/or Bidirectional Read
1035                  *  Expected Data Transfer Length are 0"
1036                  *
1037                  * For this case, go ahead and clear the unnecssary bits
1038                  * to avoid any confusion with ->data_direction.
1039                  */
1040                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1041                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1042
1043                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1044                         " set when Expected Data Transfer Length is 0 for"
1045                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1046         }
1047
1048         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1049             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1050                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1051                         " MUST be set if Expected Data Transfer Length is not 0."
1052                         " Bad iSCSI Initiator\n");
1053                 return iscsit_add_reject_cmd(cmd,
1054                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1055         }
1056
1057         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1058             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1059                 pr_err("Bidirectional operations not supported!\n");
1060                 return iscsit_add_reject_cmd(cmd,
1061                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1062         }
1063
1064         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1065                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1066                                 " Scsi Command PDU.\n");
1067                 return iscsit_add_reject_cmd(cmd,
1068                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1069         }
1070
1071         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1072                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1073                         " protocol error.\n", payload_length);
1074                 return iscsit_add_reject_cmd(cmd,
1075                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1076         }
1077
1078         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1079             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1080                 pr_err("Expected Data Transfer Length and Length of"
1081                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1082                         " bit is not set protocol error\n");
1083                 return iscsit_add_reject_cmd(cmd,
1084                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1085         }
1086
1087         if (payload_length > be32_to_cpu(hdr->data_length)) {
1088                 pr_err("DataSegmentLength: %u is greater than"
1089                         " EDTL: %u, protocol error.\n", payload_length,
1090                                 hdr->data_length);
1091                 return iscsit_add_reject_cmd(cmd,
1092                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1093         }
1094
1095         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1096                 pr_err("DataSegmentLength: %u is greater than"
1097                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1098                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1099                 return iscsit_add_reject_cmd(cmd,
1100                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1101         }
1102
1103         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1104                 pr_err("DataSegmentLength: %u is greater than"
1105                         " FirstBurstLength: %u, protocol error.\n",
1106                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1107                 return iscsit_add_reject_cmd(cmd,
1108                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1109         }
1110
1111         cdb = hdr->cdb;
1112
1113         if (hdr->hlength) {
1114                 ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1);
1115                 if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) {
1116                         pr_err("Additional Header Segment type %d not supported!\n",
1117                                ecdb_ahdr->ahstype);
1118                         return iscsit_add_reject_cmd(cmd,
1119                                 ISCSI_REASON_CMD_NOT_SUPPORTED, buf);
1120                 }
1121
1122                 cdb = kmalloc(be16_to_cpu(ecdb_ahdr->ahslength) + 15,
1123                               GFP_KERNEL);
1124                 if (cdb == NULL)
1125                         return iscsit_add_reject_cmd(cmd,
1126                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1127                 memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE);
1128                 memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb,
1129                        be16_to_cpu(ecdb_ahdr->ahslength) - 1);
1130         }
1131
1132         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1133                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1134                           DMA_NONE;
1135
1136         cmd->data_direction = data_direction;
1137         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1138         /*
1139          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1140          */
1141         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1142             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1143                 sam_task_attr = TCM_SIMPLE_TAG;
1144         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1145                 sam_task_attr = TCM_ORDERED_TAG;
1146         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1147                 sam_task_attr = TCM_HEAD_TAG;
1148         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1149                 sam_task_attr = TCM_ACA_TAG;
1150         else {
1151                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1152                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1153                 sam_task_attr = TCM_SIMPLE_TAG;
1154         }
1155
1156         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1157         cmd->i_state            = ISTATE_NEW_CMD;
1158         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1159         cmd->immediate_data     = (payload_length) ? 1 : 0;
1160         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1161                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1162         if (cmd->unsolicited_data)
1163                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1164
1165         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1166         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1167                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1168         else
1169                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1170         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1171         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1172         cmd->first_burst_len    = payload_length;
1173
1174         if (!conn->sess->sess_ops->RDMAExtensions &&
1175              cmd->data_direction == DMA_FROM_DEVICE) {
1176                 struct iscsi_datain_req *dr;
1177
1178                 dr = iscsit_allocate_datain_req();
1179                 if (!dr) {
1180                         if (cdb != hdr->cdb)
1181                                 kfree(cdb);
1182                         return iscsit_add_reject_cmd(cmd,
1183                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184                 }
1185
1186                 iscsit_attach_datain_req(cmd, dr);
1187         }
1188
1189         /*
1190          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1191          */
1192         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1193                          conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1194                          cmd->data_direction, sam_task_attr,
1195                          cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1196
1197         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1198                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1199                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1200                 conn->cid);
1201
1202         target_get_sess_cmd(&cmd->se_cmd, true);
1203
1204         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1205         cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, cdb,
1206                                                 GFP_KERNEL);
1207
1208         if (cdb != hdr->cdb)
1209                 kfree(cdb);
1210
1211         if (cmd->sense_reason) {
1212                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1213                         return iscsit_add_reject_cmd(cmd,
1214                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1215                 }
1216
1217                 goto attach_cmd;
1218         }
1219
1220         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1221         if (cmd->sense_reason)
1222                 goto attach_cmd;
1223
1224         cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1225         if (cmd->sense_reason)
1226                 goto attach_cmd;
1227
1228         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1229                 return iscsit_add_reject_cmd(cmd,
1230                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1231         }
1232
1233 attach_cmd:
1234         spin_lock_bh(&conn->cmd_lock);
1235         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1236         spin_unlock_bh(&conn->cmd_lock);
1237         /*
1238          * Check if we need to delay processing because of ALUA
1239          * Active/NonOptimized primary access state..
1240          */
1241         core_alua_check_nonop_delay(&cmd->se_cmd);
1242
1243         return 0;
1244 }
1245 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1246
1247 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1248 {
1249         iscsit_set_dataout_sequence_values(cmd);
1250
1251         spin_lock_bh(&cmd->dataout_timeout_lock);
1252         iscsit_start_dataout_timer(cmd, cmd->conn);
1253         spin_unlock_bh(&cmd->dataout_timeout_lock);
1254 }
1255 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1256
1257 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1258                             struct iscsi_scsi_req *hdr)
1259 {
1260         int cmdsn_ret = 0;
1261         /*
1262          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1263          * the Immediate Bit is not set, and no Immediate
1264          * Data is attached.
1265          *
1266          * A PDU/CmdSN carrying Immediate Data can only
1267          * be processed after the DataCRC has passed.
1268          * If the DataCRC fails, the CmdSN MUST NOT
1269          * be acknowledged. (See below)
1270          */
1271         if (!cmd->immediate_data) {
1272                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1273                                         (unsigned char *)hdr, hdr->cmdsn);
1274                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1275                         return -1;
1276                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1277                         target_put_sess_cmd(&cmd->se_cmd);
1278                         return 0;
1279                 }
1280         }
1281
1282         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1283
1284         /*
1285          * If no Immediate Data is attached, it's OK to return now.
1286          */
1287         if (!cmd->immediate_data) {
1288                 if (!cmd->sense_reason && cmd->unsolicited_data)
1289                         iscsit_set_unsolicited_dataout(cmd);
1290                 if (!cmd->sense_reason)
1291                         return 0;
1292
1293                 target_put_sess_cmd(&cmd->se_cmd);
1294                 return 0;
1295         }
1296
1297         /*
1298          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1299          * execution.  These exceptions are processed in CmdSN order using
1300          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1301          */
1302         if (cmd->sense_reason)
1303                 return 1;
1304         /*
1305          * Call directly into transport_generic_new_cmd() to perform
1306          * the backend memory allocation.
1307          */
1308         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1309         if (cmd->sense_reason)
1310                 return 1;
1311
1312         return 0;
1313 }
1314 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1315
1316 static int
1317 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1318                           bool dump_payload)
1319 {
1320         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1321         int rc;
1322
1323         /*
1324          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1325          */
1326         if (dump_payload) {
1327                 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1328                                  cmd->first_burst_len);
1329
1330                 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1331                          cmd->se_cmd.data_length, cmd->write_data_done,
1332                          cmd->first_burst_len, length);
1333                 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1334                 pr_debug("Finished dumping immediate data\n");
1335                 if (rc < 0)
1336                         immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1337         } else {
1338                 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1339                                                          cmd->first_burst_len);
1340         }
1341
1342         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1343                 /*
1344                  * A PDU/CmdSN carrying Immediate Data passed
1345                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1346                  * Immediate Bit is not set.
1347                  */
1348                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1349                                         (unsigned char *)hdr, hdr->cmdsn);
1350                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1351                         return -1;
1352
1353                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1354                         target_put_sess_cmd(&cmd->se_cmd);
1355
1356                         return 0;
1357                 } else if (cmd->unsolicited_data)
1358                         iscsit_set_unsolicited_dataout(cmd);
1359
1360         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1361                 /*
1362                  * Immediate Data failed DataCRC and ERL>=1,
1363                  * silently drop this PDU and let the initiator
1364                  * plug the CmdSN gap.
1365                  *
1366                  * FIXME: Send Unsolicited NOPIN with reserved
1367                  * TTT here to help the initiator figure out
1368                  * the missing CmdSN, although they should be
1369                  * intelligent enough to determine the missing
1370                  * CmdSN and issue a retry to plug the sequence.
1371                  */
1372                 cmd->i_state = ISTATE_REMOVE;
1373                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1374         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1375                 return -1;
1376
1377         return 0;
1378 }
1379
1380 static int
1381 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1382                            unsigned char *buf)
1383 {
1384         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1385         int rc, immed_data;
1386         bool dump_payload = false;
1387
1388         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1389         if (rc < 0)
1390                 return 0;
1391         /*
1392          * Allocation iovecs needed for struct socket operations for
1393          * traditional iSCSI block I/O.
1394          */
1395         if (iscsit_allocate_iovecs(cmd) < 0) {
1396                 return iscsit_reject_cmd(cmd,
1397                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1398         }
1399         immed_data = cmd->immediate_data;
1400
1401         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1402         if (rc < 0)
1403                 return rc;
1404         else if (rc > 0)
1405                 dump_payload = true;
1406
1407         if (!immed_data)
1408                 return 0;
1409
1410         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1411 }
1412
1413 static u32 iscsit_do_crypto_hash_sg(
1414         struct ahash_request *hash,
1415         struct iscsit_cmd *cmd,
1416         u32 data_offset,
1417         u32 data_length,
1418         u32 padding,
1419         u8 *pad_bytes)
1420 {
1421         u32 data_crc;
1422         struct scatterlist *sg;
1423         unsigned int page_off;
1424
1425         crypto_ahash_init(hash);
1426
1427         sg = cmd->first_data_sg;
1428         page_off = cmd->first_data_sg_off;
1429
1430         if (data_length && page_off) {
1431                 struct scatterlist first_sg;
1432                 u32 len = min_t(u32, data_length, sg->length - page_off);
1433
1434                 sg_init_table(&first_sg, 1);
1435                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1436
1437                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1438                 crypto_ahash_update(hash);
1439
1440                 data_length -= len;
1441                 sg = sg_next(sg);
1442         }
1443
1444         while (data_length) {
1445                 u32 cur_len = min_t(u32, data_length, sg->length);
1446
1447                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1448                 crypto_ahash_update(hash);
1449
1450                 data_length -= cur_len;
1451                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1452                 sg = sg_next(sg);
1453         }
1454
1455         if (padding) {
1456                 struct scatterlist pad_sg;
1457
1458                 sg_init_one(&pad_sg, pad_bytes, padding);
1459                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1460                                         padding);
1461                 crypto_ahash_finup(hash);
1462         } else {
1463                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1464                 crypto_ahash_final(hash);
1465         }
1466
1467         return data_crc;
1468 }
1469
1470 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1471         const void *buf, u32 payload_length, u32 padding,
1472         const void *pad_bytes, void *data_crc)
1473 {
1474         struct scatterlist sg[2];
1475
1476         sg_init_table(sg, ARRAY_SIZE(sg));
1477         sg_set_buf(sg, buf, payload_length);
1478         if (padding)
1479                 sg_set_buf(sg + 1, pad_bytes, padding);
1480
1481         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1482
1483         crypto_ahash_digest(hash);
1484 }
1485
1486 int
1487 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1488                            struct iscsit_cmd *cmd, u32 payload_length,
1489                            bool *success)
1490 {
1491         struct iscsi_data *hdr = buf;
1492         struct se_cmd *se_cmd;
1493         int rc;
1494
1495         /* iSCSI write */
1496         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1497
1498         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1499                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1500                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1501                 payload_length, conn->cid);
1502
1503         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1504                 pr_err("Command ITT: 0x%08x received DataOUT after"
1505                         " last DataOUT received, dumping payload\n",
1506                         cmd->init_task_tag);
1507                 return iscsit_dump_data_payload(conn, payload_length, 1);
1508         }
1509
1510         if (cmd->data_direction != DMA_TO_DEVICE) {
1511                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1512                         " NON-WRITE command.\n", cmd->init_task_tag);
1513                 return iscsit_dump_data_payload(conn, payload_length, 1);
1514         }
1515         se_cmd = &cmd->se_cmd;
1516         iscsit_mod_dataout_timer(cmd);
1517
1518         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1519                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1520                        be32_to_cpu(hdr->offset), payload_length,
1521                        cmd->se_cmd.data_length);
1522                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1523         }
1524
1525         if (cmd->unsolicited_data) {
1526                 int dump_unsolicited_data = 0;
1527
1528                 if (conn->sess->sess_ops->InitialR2T) {
1529                         pr_err("Received unexpected unsolicited data"
1530                                 " while InitialR2T=Yes, protocol error.\n");
1531                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1532                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1533                         return -1;
1534                 }
1535                 /*
1536                  * Special case for dealing with Unsolicited DataOUT
1537                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1538                  * failures;
1539                  */
1540
1541                 /* Something's amiss if we're not in WRITE_PENDING state... */
1542                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1543                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1544                         dump_unsolicited_data = 1;
1545
1546                 if (dump_unsolicited_data) {
1547                         /*
1548                          * Check if a delayed TASK_ABORTED status needs to
1549                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1550                          * received with the unsolicited data out.
1551                          */
1552                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1553                                 iscsit_stop_dataout_timer(cmd);
1554
1555                         return iscsit_dump_data_payload(conn, payload_length, 1);
1556                 }
1557         } else {
1558                 /*
1559                  * For the normal solicited data path:
1560                  *
1561                  * Check for a delayed TASK_ABORTED status and dump any
1562                  * incoming data out payload if one exists.  Also, when the
1563                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1564                  * data out sequence, we decrement outstanding_r2ts.  Once
1565                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1566                  * TASK_ABORTED status.
1567                  */
1568                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1569                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1570                             --cmd->outstanding_r2ts < 1)
1571                                 iscsit_stop_dataout_timer(cmd);
1572
1573                         return iscsit_dump_data_payload(conn, payload_length, 1);
1574                 }
1575         }
1576         /*
1577          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1578          * within-command recovery checks before receiving the payload.
1579          */
1580         rc = iscsit_check_pre_dataout(cmd, buf);
1581         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1582                 return 0;
1583         else if (rc == DATAOUT_CANNOT_RECOVER)
1584                 return -1;
1585         *success = true;
1586         return 0;
1587 }
1588 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1589
1590 int
1591 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1592                          struct iscsit_cmd **out_cmd)
1593 {
1594         struct iscsi_data *hdr = buf;
1595         struct iscsit_cmd *cmd;
1596         u32 payload_length = ntoh24(hdr->dlength);
1597         int rc;
1598         bool success = false;
1599
1600         if (!payload_length) {
1601                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1602                 return 0;
1603         }
1604
1605         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1606                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1607                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1608                         conn->conn_ops->MaxXmitDataSegmentLength);
1609                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1610         }
1611
1612         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1613         if (!cmd)
1614                 return 0;
1615
1616         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1617
1618         if (success)
1619                 *out_cmd = cmd;
1620
1621         return rc;
1622 }
1623 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1624
1625 static int
1626 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1627                    struct iscsi_data *hdr)
1628 {
1629         struct kvec *iov;
1630         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1631         u32 payload_length;
1632         int iov_ret, data_crc_failed = 0;
1633
1634         payload_length = min_t(u32, cmd->se_cmd.data_length,
1635                                ntoh24(hdr->dlength));
1636         rx_size += payload_length;
1637         iov = &cmd->iov_data[0];
1638
1639         iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1640                                    be32_to_cpu(hdr->offset), payload_length);
1641         if (iov_ret < 0)
1642                 return -1;
1643
1644         iov_count += iov_ret;
1645
1646         padding = ((-payload_length) & 3);
1647         if (padding != 0) {
1648                 iov[iov_count].iov_base = cmd->pad_bytes;
1649                 iov[iov_count++].iov_len = padding;
1650                 rx_size += padding;
1651                 pr_debug("Receiving %u padding bytes.\n", padding);
1652         }
1653
1654         if (conn->conn_ops->DataDigest) {
1655                 iov[iov_count].iov_base = &checksum;
1656                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1657                 rx_size += ISCSI_CRC_LEN;
1658         }
1659
1660         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1661         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1662
1663         iscsit_unmap_iovec(cmd);
1664
1665         if (rx_got != rx_size)
1666                 return -1;
1667
1668         if (conn->conn_ops->DataDigest) {
1669                 u32 data_crc;
1670
1671                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1672                                                     be32_to_cpu(hdr->offset),
1673                                                     payload_length, padding,
1674                                                     cmd->pad_bytes);
1675
1676                 if (checksum != data_crc) {
1677                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1678                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1679                                 " does not match computed 0x%08x\n",
1680                                 hdr->itt, hdr->offset, payload_length,
1681                                 hdr->datasn, checksum, data_crc);
1682                         data_crc_failed = 1;
1683                 } else {
1684                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1685                                 " %u bytes of Data Out\n", checksum,
1686                                 payload_length);
1687                 }
1688         }
1689
1690         return data_crc_failed;
1691 }
1692
1693 int
1694 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1695                              bool data_crc_failed)
1696 {
1697         struct iscsit_conn *conn = cmd->conn;
1698         int rc, ooo_cmdsn;
1699         /*
1700          * Increment post receive data and CRC values or perform
1701          * within-command recovery.
1702          */
1703         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1704         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1705                 return 0;
1706         else if (rc == DATAOUT_SEND_R2T) {
1707                 iscsit_set_dataout_sequence_values(cmd);
1708                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1709         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1710                 /*
1711                  * Handle extra special case for out of order
1712                  * Unsolicited Data Out.
1713                  */
1714                 spin_lock_bh(&cmd->istate_lock);
1715                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1716                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1717                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1718                 spin_unlock_bh(&cmd->istate_lock);
1719
1720                 iscsit_stop_dataout_timer(cmd);
1721                 if (ooo_cmdsn)
1722                         return 0;
1723                 target_execute_cmd(&cmd->se_cmd);
1724                 return 0;
1725         } else /* DATAOUT_CANNOT_RECOVER */
1726                 return -1;
1727
1728         return 0;
1729 }
1730 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1731
1732 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1733 {
1734         struct iscsit_cmd *cmd = NULL;
1735         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1736         int rc;
1737         bool data_crc_failed = false;
1738
1739         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1740         if (rc < 0)
1741                 return 0;
1742         else if (!cmd)
1743                 return 0;
1744
1745         rc = iscsit_get_dataout(conn, cmd, hdr);
1746         if (rc < 0)
1747                 return rc;
1748         else if (rc > 0)
1749                 data_crc_failed = true;
1750
1751         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1752 }
1753
1754 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1755                          struct iscsi_nopout *hdr)
1756 {
1757         u32 payload_length = ntoh24(hdr->dlength);
1758
1759         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1760                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1761                 if (!cmd)
1762                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1763                                                  (unsigned char *)hdr);
1764
1765                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1766                                          (unsigned char *)hdr);
1767         }
1768
1769         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1770                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1771                         " not set, protocol error.\n");
1772                 if (!cmd)
1773                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1774                                                  (unsigned char *)hdr);
1775
1776                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1777                                          (unsigned char *)hdr);
1778         }
1779
1780         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1781                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1782                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1783                         " error.\n", payload_length,
1784                         conn->conn_ops->MaxXmitDataSegmentLength);
1785                 if (!cmd)
1786                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1787                                                  (unsigned char *)hdr);
1788
1789                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1790                                          (unsigned char *)hdr);
1791         }
1792
1793         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1794                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1795                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1796                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1797                 payload_length);
1798         /*
1799          * This is not a response to a Unsolicited NopIN, which means
1800          * it can either be a NOPOUT ping request (with a valid ITT),
1801          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1802          * Either way, make sure we allocate an struct iscsit_cmd, as both
1803          * can contain ping data.
1804          */
1805         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1806                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1807                 cmd->i_state            = ISTATE_SEND_NOPIN;
1808                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1809                                                 1 : 0);
1810                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1811                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1812                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1813                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1814                 cmd->data_direction     = DMA_NONE;
1815         }
1816
1817         return 0;
1818 }
1819 EXPORT_SYMBOL(iscsit_setup_nop_out);
1820
1821 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1822                            struct iscsi_nopout *hdr)
1823 {
1824         struct iscsit_cmd *cmd_p = NULL;
1825         int cmdsn_ret = 0;
1826         /*
1827          * Initiator is expecting a NopIN ping reply..
1828          */
1829         if (hdr->itt != RESERVED_ITT) {
1830                 if (!cmd)
1831                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1832                                                 (unsigned char *)hdr);
1833
1834                 spin_lock_bh(&conn->cmd_lock);
1835                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1836                 spin_unlock_bh(&conn->cmd_lock);
1837
1838                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1839
1840                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1841                         iscsit_add_cmd_to_response_queue(cmd, conn,
1842                                                          cmd->i_state);
1843                         return 0;
1844                 }
1845
1846                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1847                                 (unsigned char *)hdr, hdr->cmdsn);
1848                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1849                         return 0;
1850                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1851                         return -1;
1852
1853                 return 0;
1854         }
1855         /*
1856          * This was a response to a unsolicited NOPIN ping.
1857          */
1858         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1859                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1860                 if (!cmd_p)
1861                         return -EINVAL;
1862
1863                 iscsit_stop_nopin_response_timer(conn);
1864
1865                 cmd_p->i_state = ISTATE_REMOVE;
1866                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1867
1868                 iscsit_start_nopin_timer(conn);
1869                 return 0;
1870         }
1871         /*
1872          * Otherwise, initiator is not expecting a NOPIN is response.
1873          * Just ignore for now.
1874          */
1875
1876         if (cmd)
1877                 iscsit_free_cmd(cmd, false);
1878
1879         return 0;
1880 }
1881 EXPORT_SYMBOL(iscsit_process_nop_out);
1882
1883 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1884                                  unsigned char *buf)
1885 {
1886         unsigned char *ping_data = NULL;
1887         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1888         struct kvec *iov = NULL;
1889         u32 payload_length = ntoh24(hdr->dlength);
1890         int ret;
1891
1892         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1893         if (ret < 0)
1894                 return 0;
1895         /*
1896          * Handle NOP-OUT payload for traditional iSCSI sockets
1897          */
1898         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1899                 u32 checksum, data_crc, padding = 0;
1900                 int niov = 0, rx_got, rx_size = payload_length;
1901
1902                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1903                 if (!ping_data) {
1904                         ret = -1;
1905                         goto out;
1906                 }
1907
1908                 iov = &cmd->iov_misc[0];
1909                 iov[niov].iov_base      = ping_data;
1910                 iov[niov++].iov_len     = payload_length;
1911
1912                 padding = ((-payload_length) & 3);
1913                 if (padding != 0) {
1914                         pr_debug("Receiving %u additional bytes"
1915                                 " for padding.\n", padding);
1916                         iov[niov].iov_base      = &cmd->pad_bytes;
1917                         iov[niov++].iov_len     = padding;
1918                         rx_size += padding;
1919                 }
1920                 if (conn->conn_ops->DataDigest) {
1921                         iov[niov].iov_base      = &checksum;
1922                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1923                         rx_size += ISCSI_CRC_LEN;
1924                 }
1925
1926                 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1927                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1928                 if (rx_got != rx_size) {
1929                         ret = -1;
1930                         goto out;
1931                 }
1932
1933                 if (conn->conn_ops->DataDigest) {
1934                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1935                                                   payload_length, padding,
1936                                                   cmd->pad_bytes, &data_crc);
1937
1938                         if (checksum != data_crc) {
1939                                 pr_err("Ping data CRC32C DataDigest"
1940                                 " 0x%08x does not match computed 0x%08x\n",
1941                                         checksum, data_crc);
1942                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1943                                         pr_err("Unable to recover from"
1944                                         " NOPOUT Ping DataCRC failure while in"
1945                                                 " ERL=0.\n");
1946                                         ret = -1;
1947                                         goto out;
1948                                 } else {
1949                                         /*
1950                                          * Silently drop this PDU and let the
1951                                          * initiator plug the CmdSN gap.
1952                                          */
1953                                         pr_debug("Dropping NOPOUT"
1954                                         " Command CmdSN: 0x%08x due to"
1955                                         " DataCRC error.\n", hdr->cmdsn);
1956                                         ret = 0;
1957                                         goto out;
1958                                 }
1959                         } else {
1960                                 pr_debug("Got CRC32C DataDigest"
1961                                 " 0x%08x for %u bytes of ping data.\n",
1962                                         checksum, payload_length);
1963                         }
1964                 }
1965
1966                 ping_data[payload_length] = '\0';
1967                 /*
1968                  * Attach ping data to struct iscsit_cmd->buf_ptr.
1969                  */
1970                 cmd->buf_ptr = ping_data;
1971                 cmd->buf_ptr_size = payload_length;
1972
1973                 pr_debug("Got %u bytes of NOPOUT ping"
1974                         " data.\n", payload_length);
1975                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1976         }
1977
1978         return iscsit_process_nop_out(conn, cmd, hdr);
1979 out:
1980         if (cmd)
1981                 iscsit_free_cmd(cmd, false);
1982
1983         kfree(ping_data);
1984         return ret;
1985 }
1986
1987 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1988 {
1989         switch (iscsi_tmf) {
1990         case ISCSI_TM_FUNC_ABORT_TASK:
1991                 return TMR_ABORT_TASK;
1992         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1993                 return TMR_ABORT_TASK_SET;
1994         case ISCSI_TM_FUNC_CLEAR_ACA:
1995                 return TMR_CLEAR_ACA;
1996         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1997                 return TMR_CLEAR_TASK_SET;
1998         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1999                 return TMR_LUN_RESET;
2000         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2001                 return TMR_TARGET_WARM_RESET;
2002         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2003                 return TMR_TARGET_COLD_RESET;
2004         default:
2005                 return TMR_UNKNOWN;
2006         }
2007 }
2008
2009 int
2010 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2011                            unsigned char *buf)
2012 {
2013         struct se_tmr_req *se_tmr;
2014         struct iscsi_tmr_req *tmr_req;
2015         struct iscsi_tm *hdr;
2016         int out_of_order_cmdsn = 0, ret;
2017         u8 function, tcm_function = TMR_UNKNOWN;
2018
2019         hdr                     = (struct iscsi_tm *) buf;
2020         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2021         function = hdr->flags;
2022
2023         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
2024                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
2025                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
2026                 hdr->rtt, hdr->refcmdsn, conn->cid);
2027
2028         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2029             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2030              hdr->rtt != RESERVED_ITT)) {
2031                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
2032                 hdr->rtt = RESERVED_ITT;
2033         }
2034
2035         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
2036                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2037                 pr_err("Task Management Request TASK_REASSIGN not"
2038                         " issued as immediate command, bad iSCSI Initiator"
2039                                 "implementation\n");
2040                 return iscsit_add_reject_cmd(cmd,
2041                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
2042         }
2043         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2044             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2045                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2046
2047         cmd->data_direction = DMA_NONE;
2048         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2049         if (!cmd->tmr_req) {
2050                 return iscsit_add_reject_cmd(cmd,
2051                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2052                                              buf);
2053         }
2054
2055         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2056                           conn->sess->se_sess, 0, DMA_NONE,
2057                           TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2058                           scsilun_to_int(&hdr->lun));
2059
2060         target_get_sess_cmd(&cmd->se_cmd, true);
2061
2062         /*
2063          * TASK_REASSIGN for ERL=2 / connection stays inside of
2064          * LIO-Target $FABRIC_MOD
2065          */
2066         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2067                 tcm_function = iscsit_convert_tmf(function);
2068                 if (tcm_function == TMR_UNKNOWN) {
2069                         pr_err("Unknown iSCSI TMR Function:"
2070                                " 0x%02x\n", function);
2071                         return iscsit_add_reject_cmd(cmd,
2072                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2073                 }
2074         }
2075         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2076                                  GFP_KERNEL);
2077         if (ret < 0)
2078                 return iscsit_add_reject_cmd(cmd,
2079                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2080
2081         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2082
2083         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2084         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2085         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2086         cmd->init_task_tag      = hdr->itt;
2087         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2088         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2089         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2090         se_tmr                  = cmd->se_cmd.se_tmr_req;
2091         tmr_req                 = cmd->tmr_req;
2092         /*
2093          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2094          */
2095         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2096                 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2097                 if (ret < 0) {
2098                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2099                         goto attach;
2100                 }
2101         }
2102
2103         switch (function) {
2104         case ISCSI_TM_FUNC_ABORT_TASK:
2105                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2106                 if (se_tmr->response)
2107                         goto attach;
2108                 break;
2109         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2110         case ISCSI_TM_FUNC_CLEAR_ACA:
2111         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2112         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2113                 break;
2114         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2115                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2116                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2117                         goto attach;
2118                 }
2119                 break;
2120         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2121                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2122                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2123                         goto attach;
2124                 }
2125                 break;
2126         case ISCSI_TM_FUNC_TASK_REASSIGN:
2127                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2128                 /*
2129                  * Perform sanity checks on the ExpDataSN only if the
2130                  * TASK_REASSIGN was successful.
2131                  */
2132                 if (se_tmr->response)
2133                         break;
2134
2135                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2136                         return iscsit_add_reject_cmd(cmd,
2137                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2138                 break;
2139         default:
2140                 pr_err("Unknown TMR function: 0x%02x, protocol"
2141                         " error.\n", function);
2142                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2143                 goto attach;
2144         }
2145
2146         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2147             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2148                 se_tmr->call_transport = 1;
2149 attach:
2150         spin_lock_bh(&conn->cmd_lock);
2151         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2152         spin_unlock_bh(&conn->cmd_lock);
2153
2154         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2155                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2156                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2157                         out_of_order_cmdsn = 1;
2158                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2159                         target_put_sess_cmd(&cmd->se_cmd);
2160                         return 0;
2161                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2162                         return -1;
2163                 }
2164         }
2165         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2166
2167         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2168                 return 0;
2169         /*
2170          * Found the referenced task, send to transport for processing.
2171          */
2172         if (se_tmr->call_transport)
2173                 return transport_generic_handle_tmr(&cmd->se_cmd);
2174
2175         /*
2176          * Could not find the referenced LUN, task, or Task Management
2177          * command not authorized or supported.  Change state and
2178          * let the tx_thread send the response.
2179          *
2180          * For connection recovery, this is also the default action for
2181          * TMR TASK_REASSIGN.
2182          */
2183         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2184         target_put_sess_cmd(&cmd->se_cmd);
2185         return 0;
2186 }
2187 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2188
2189 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2190 int
2191 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2192                       struct iscsi_text *hdr)
2193 {
2194         u32 payload_length = ntoh24(hdr->dlength);
2195
2196         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2197                 pr_err("Unable to accept text parameter length: %u"
2198                         "greater than MaxXmitDataSegmentLength %u.\n",
2199                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2200                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2201                                          (unsigned char *)hdr);
2202         }
2203
2204         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2205              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2206                 pr_err("Multi sequence text commands currently not supported\n");
2207                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2208                                         (unsigned char *)hdr);
2209         }
2210
2211         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2212                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2213                 hdr->exp_statsn, payload_length);
2214
2215         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2216         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2217         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2218         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2219         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2220         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2221         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2222         cmd->data_direction     = DMA_NONE;
2223         kfree(cmd->text_in_ptr);
2224         cmd->text_in_ptr        = NULL;
2225
2226         return 0;
2227 }
2228 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2229
2230 int
2231 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2232                         struct iscsi_text *hdr)
2233 {
2234         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2235         int cmdsn_ret;
2236
2237         if (!text_in) {
2238                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2239                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2240                         pr_err("Unable to locate text_in buffer for sendtargets"
2241                                " discovery\n");
2242                         goto reject;
2243                 }
2244                 goto empty_sendtargets;
2245         }
2246         if (strncmp("SendTargets=", text_in, 12) != 0) {
2247                 pr_err("Received Text Data that is not"
2248                         " SendTargets, cannot continue.\n");
2249                 goto reject;
2250         }
2251         /* '=' confirmed in strncmp */
2252         text_ptr = strchr(text_in, '=');
2253         BUG_ON(!text_ptr);
2254         if (!strncmp("=All", text_ptr, 5)) {
2255                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2256         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2257                    !strncmp("=eui.", text_ptr, 5)) {
2258                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2259         } else {
2260                 pr_err("Unable to locate valid SendTargets%s value\n",
2261                        text_ptr);
2262                 goto reject;
2263         }
2264
2265         spin_lock_bh(&conn->cmd_lock);
2266         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2267         spin_unlock_bh(&conn->cmd_lock);
2268
2269 empty_sendtargets:
2270         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2271
2272         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2273                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2274                                 (unsigned char *)hdr, hdr->cmdsn);
2275                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2276                         return -1;
2277
2278                 return 0;
2279         }
2280
2281         return iscsit_execute_cmd(cmd, 0);
2282
2283 reject:
2284         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2285                                  (unsigned char *)hdr);
2286 }
2287 EXPORT_SYMBOL(iscsit_process_text_cmd);
2288
2289 static int
2290 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2291                        unsigned char *buf)
2292 {
2293         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2294         char *text_in = NULL;
2295         u32 payload_length = ntoh24(hdr->dlength);
2296         int rx_size, rc;
2297
2298         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2299         if (rc < 0)
2300                 return 0;
2301
2302         rx_size = payload_length;
2303         if (payload_length) {
2304                 u32 checksum = 0, data_crc = 0;
2305                 u32 padding = 0;
2306                 int niov = 0, rx_got;
2307                 struct kvec iov[2];
2308
2309                 rx_size = ALIGN(payload_length, 4);
2310                 text_in = kzalloc(rx_size, GFP_KERNEL);
2311                 if (!text_in)
2312                         goto reject;
2313
2314                 cmd->text_in_ptr = text_in;
2315
2316                 memset(iov, 0, sizeof(iov));
2317                 iov[niov].iov_base      = text_in;
2318                 iov[niov++].iov_len     = rx_size;
2319
2320                 padding = rx_size - payload_length;
2321                 if (padding)
2322                         pr_debug("Receiving %u additional bytes"
2323                                         " for padding.\n", padding);
2324                 if (conn->conn_ops->DataDigest) {
2325                         iov[niov].iov_base      = &checksum;
2326                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2327                         rx_size += ISCSI_CRC_LEN;
2328                 }
2329
2330                 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2331                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2332                 if (rx_got != rx_size)
2333                         goto reject;
2334
2335                 if (conn->conn_ops->DataDigest) {
2336                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2337                                                   text_in, rx_size, 0, NULL,
2338                                                   &data_crc);
2339
2340                         if (checksum != data_crc) {
2341                                 pr_err("Text data CRC32C DataDigest"
2342                                         " 0x%08x does not match computed"
2343                                         " 0x%08x\n", checksum, data_crc);
2344                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2345                                         pr_err("Unable to recover from"
2346                                         " Text Data digest failure while in"
2347                                                 " ERL=0.\n");
2348                                         goto reject;
2349                                 } else {
2350                                         /*
2351                                          * Silently drop this PDU and let the
2352                                          * initiator plug the CmdSN gap.
2353                                          */
2354                                         pr_debug("Dropping Text"
2355                                         " Command CmdSN: 0x%08x due to"
2356                                         " DataCRC error.\n", hdr->cmdsn);
2357                                         kfree(text_in);
2358                                         return 0;
2359                                 }
2360                         } else {
2361                                 pr_debug("Got CRC32C DataDigest"
2362                                         " 0x%08x for %u bytes of text data.\n",
2363                                                 checksum, payload_length);
2364                         }
2365                 }
2366                 text_in[payload_length - 1] = '\0';
2367                 pr_debug("Successfully read %d bytes of text"
2368                                 " data.\n", payload_length);
2369         }
2370
2371         return iscsit_process_text_cmd(conn, cmd, hdr);
2372
2373 reject:
2374         kfree(cmd->text_in_ptr);
2375         cmd->text_in_ptr = NULL;
2376         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2377 }
2378
2379 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2380 {
2381         struct iscsit_conn *conn_p;
2382         struct iscsit_session *sess = conn->sess;
2383
2384         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2385                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2386
2387         atomic_set(&sess->session_logout, 1);
2388         atomic_set(&conn->conn_logout_remove, 1);
2389         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2390
2391         iscsit_inc_conn_usage_count(conn);
2392         iscsit_inc_session_usage_count(sess);
2393
2394         spin_lock_bh(&sess->conn_lock);
2395         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2396                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2397                         continue;
2398
2399                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2400                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2401         }
2402         spin_unlock_bh(&sess->conn_lock);
2403
2404         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2405
2406         return 0;
2407 }
2408
2409 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2410 {
2411         struct iscsit_conn *l_conn;
2412         struct iscsit_session *sess = conn->sess;
2413
2414         pr_debug("Received logout request CLOSECONNECTION for CID:"
2415                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2416
2417         /*
2418          * A Logout Request with a CLOSECONNECTION reason code for a CID
2419          * can arrive on a connection with a differing CID.
2420          */
2421         if (conn->cid == cmd->logout_cid) {
2422                 spin_lock_bh(&conn->state_lock);
2423                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2424                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2425
2426                 atomic_set(&conn->conn_logout_remove, 1);
2427                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2428                 iscsit_inc_conn_usage_count(conn);
2429
2430                 spin_unlock_bh(&conn->state_lock);
2431         } else {
2432                 /*
2433                  * Handle all different cid CLOSECONNECTION requests in
2434                  * iscsit_logout_post_handler_diffcid() as to give enough
2435                  * time for any non immediate command's CmdSN to be
2436                  * acknowledged on the connection in question.
2437                  *
2438                  * Here we simply make sure the CID is still around.
2439                  */
2440                 l_conn = iscsit_get_conn_from_cid(sess,
2441                                 cmd->logout_cid);
2442                 if (!l_conn) {
2443                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2444                         iscsit_add_cmd_to_response_queue(cmd, conn,
2445                                         cmd->i_state);
2446                         return 0;
2447                 }
2448
2449                 iscsit_dec_conn_usage_count(l_conn);
2450         }
2451
2452         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2453
2454         return 0;
2455 }
2456
2457 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2458 {
2459         struct iscsit_session *sess = conn->sess;
2460
2461         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2462                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2463
2464         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2465                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2466                         " while ERL!=2.\n");
2467                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2468                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2469                 return 0;
2470         }
2471
2472         if (conn->cid == cmd->logout_cid) {
2473                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2474                         " with CID: %hu on CID: %hu, implementation error.\n",
2475                                 cmd->logout_cid, conn->cid);
2476                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2477                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2478                 return 0;
2479         }
2480
2481         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2482
2483         return 0;
2484 }
2485
2486 int
2487 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2488                         unsigned char *buf)
2489 {
2490         int cmdsn_ret, logout_remove = 0;
2491         u8 reason_code = 0;
2492         struct iscsi_logout *hdr;
2493         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2494
2495         hdr                     = (struct iscsi_logout *) buf;
2496         reason_code             = (hdr->flags & 0x7f);
2497
2498         if (tiqn) {
2499                 spin_lock(&tiqn->logout_stats.lock);
2500                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2501                         tiqn->logout_stats.normal_logouts++;
2502                 else
2503                         tiqn->logout_stats.abnormal_logouts++;
2504                 spin_unlock(&tiqn->logout_stats.lock);
2505         }
2506
2507         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2508                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2509                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2510                 hdr->cid, conn->cid);
2511
2512         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2513                 pr_err("Received logout request on connection that"
2514                         " is not in logged in state, ignoring request.\n");
2515                 iscsit_free_cmd(cmd, false);
2516                 return 0;
2517         }
2518
2519         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2520         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2521         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2522         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2523         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2524         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2525         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2526         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2527         cmd->logout_reason      = reason_code;
2528         cmd->data_direction     = DMA_NONE;
2529
2530         /*
2531          * We need to sleep in these cases (by returning 1) until the Logout
2532          * Response gets sent in the tx thread.
2533          */
2534         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2535            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2536             be16_to_cpu(hdr->cid) == conn->cid))
2537                 logout_remove = 1;
2538
2539         spin_lock_bh(&conn->cmd_lock);
2540         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2541         spin_unlock_bh(&conn->cmd_lock);
2542
2543         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2544                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2545
2546         /*
2547          * Immediate commands are executed, well, immediately.
2548          * Non-Immediate Logout Commands are executed in CmdSN order.
2549          */
2550         if (cmd->immediate_cmd) {
2551                 int ret = iscsit_execute_cmd(cmd, 0);
2552
2553                 if (ret < 0)
2554                         return ret;
2555         } else {
2556                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2557                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2558                         logout_remove = 0;
2559                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2560                         return -1;
2561         }
2562
2563         return logout_remove;
2564 }
2565 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2566
2567 int iscsit_handle_snack(
2568         struct iscsit_conn *conn,
2569         unsigned char *buf)
2570 {
2571         struct iscsi_snack *hdr;
2572
2573         hdr                     = (struct iscsi_snack *) buf;
2574         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2575
2576         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2577                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2578                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2579                         hdr->begrun, hdr->runlength, conn->cid);
2580
2581         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2582                 pr_err("Initiator sent SNACK request while in"
2583                         " ErrorRecoveryLevel=0.\n");
2584                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2585                                          buf);
2586         }
2587         /*
2588          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2589          * call from inside iscsi_send_recovery_datain_or_r2t().
2590          */
2591         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2592         case 0:
2593                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2594                         hdr->itt,
2595                         be32_to_cpu(hdr->ttt),
2596                         be32_to_cpu(hdr->begrun),
2597                         be32_to_cpu(hdr->runlength));
2598         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2599                 return iscsit_handle_status_snack(conn, hdr->itt,
2600                         be32_to_cpu(hdr->ttt),
2601                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2602         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2603                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2604                         be32_to_cpu(hdr->begrun),
2605                         be32_to_cpu(hdr->runlength));
2606         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2607                 /* FIXME: Support R-Data SNACK */
2608                 pr_err("R-Data SNACK Not Supported.\n");
2609                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2610                                          buf);
2611         default:
2612                 pr_err("Unknown SNACK type 0x%02x, protocol"
2613                         " error.\n", hdr->flags & 0x0f);
2614                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2615                                          buf);
2616         }
2617
2618         return 0;
2619 }
2620 EXPORT_SYMBOL(iscsit_handle_snack);
2621
2622 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2623 {
2624         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2625             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2626                 wait_for_completion_interruptible_timeout(
2627                                         &conn->rx_half_close_comp,
2628                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2629         }
2630 }
2631
2632 static int iscsit_handle_immediate_data(
2633         struct iscsit_cmd *cmd,
2634         struct iscsi_scsi_req *hdr,
2635         u32 length)
2636 {
2637         int iov_ret, rx_got = 0, rx_size = 0;
2638         u32 checksum, iov_count = 0, padding = 0;
2639         struct iscsit_conn *conn = cmd->conn;
2640         struct kvec *iov;
2641         void *overflow_buf = NULL;
2642
2643         BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2644         rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2645         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2646                                    cmd->orig_iov_data_count - 2,
2647                                    cmd->write_data_done, rx_size);
2648         if (iov_ret < 0)
2649                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2650
2651         iov_count = iov_ret;
2652         iov = &cmd->iov_data[0];
2653         if (rx_size < length) {
2654                 /*
2655                  * Special case: length of immediate data exceeds the data
2656                  * buffer size derived from the CDB.
2657                  */
2658                 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2659                 if (!overflow_buf) {
2660                         iscsit_unmap_iovec(cmd);
2661                         return IMMEDIATE_DATA_CANNOT_RECOVER;
2662                 }
2663                 cmd->overflow_buf = overflow_buf;
2664                 iov[iov_count].iov_base = overflow_buf;
2665                 iov[iov_count].iov_len = length - rx_size;
2666                 iov_count++;
2667                 rx_size = length;
2668         }
2669
2670         padding = ((-length) & 3);
2671         if (padding != 0) {
2672                 iov[iov_count].iov_base = cmd->pad_bytes;
2673                 iov[iov_count++].iov_len = padding;
2674                 rx_size += padding;
2675         }
2676
2677         if (conn->conn_ops->DataDigest) {
2678                 iov[iov_count].iov_base         = &checksum;
2679                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2680                 rx_size += ISCSI_CRC_LEN;
2681         }
2682
2683         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2684         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2685
2686         iscsit_unmap_iovec(cmd);
2687
2688         if (rx_got != rx_size) {
2689                 iscsit_rx_thread_wait_for_tcp(conn);
2690                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2691         }
2692
2693         if (conn->conn_ops->DataDigest) {
2694                 u32 data_crc;
2695
2696                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2697                                                     cmd->write_data_done, length, padding,
2698                                                     cmd->pad_bytes);
2699
2700                 if (checksum != data_crc) {
2701                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2702                                 " does not match computed 0x%08x\n", checksum,
2703                                 data_crc);
2704
2705                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2706                                 pr_err("Unable to recover from"
2707                                         " Immediate Data digest failure while"
2708                                         " in ERL=0.\n");
2709                                 iscsit_reject_cmd(cmd,
2710                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2711                                                 (unsigned char *)hdr);
2712                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2713                         } else {
2714                                 iscsit_reject_cmd(cmd,
2715                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2716                                                 (unsigned char *)hdr);
2717                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2718                         }
2719                 } else {
2720                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2721                                 " %u bytes of Immediate Data\n", checksum,
2722                                 length);
2723                 }
2724         }
2725
2726         cmd->write_data_done += length;
2727
2728         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2729                 spin_lock_bh(&cmd->istate_lock);
2730                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2731                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2732                 spin_unlock_bh(&cmd->istate_lock);
2733         }
2734
2735         return IMMEDIATE_DATA_NORMAL_OPERATION;
2736 }
2737
2738 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2739         with active network interface */
2740 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2741 {
2742         struct iscsit_cmd *cmd;
2743         struct iscsit_conn *conn_p;
2744         bool found = false;
2745
2746         lockdep_assert_held(&conn->sess->conn_lock);
2747
2748         /*
2749          * Only send a Asynchronous Message on connections whos network
2750          * interface is still functional.
2751          */
2752         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2753                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2754                         iscsit_inc_conn_usage_count(conn_p);
2755                         found = true;
2756                         break;
2757                 }
2758         }
2759
2760         if (!found)
2761                 return;
2762
2763         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2764         if (!cmd) {
2765                 iscsit_dec_conn_usage_count(conn_p);
2766                 return;
2767         }
2768
2769         cmd->logout_cid = conn->cid;
2770         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2771         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2772
2773         spin_lock_bh(&conn_p->cmd_lock);
2774         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2775         spin_unlock_bh(&conn_p->cmd_lock);
2776
2777         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2778         iscsit_dec_conn_usage_count(conn_p);
2779 }
2780
2781 static int iscsit_send_conn_drop_async_message(
2782         struct iscsit_cmd *cmd,
2783         struct iscsit_conn *conn)
2784 {
2785         struct iscsi_async *hdr;
2786
2787         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2788
2789         hdr                     = (struct iscsi_async *) cmd->pdu;
2790         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2791         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2792         cmd->init_task_tag      = RESERVED_ITT;
2793         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2794         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2795         cmd->stat_sn            = conn->stat_sn++;
2796         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2797         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2798         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2799         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2800         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2801         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2802         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2803
2804         pr_debug("Sending Connection Dropped Async Message StatSN:"
2805                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2806                         cmd->logout_cid, conn->cid);
2807
2808         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2809 }
2810
2811 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2812 {
2813         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2814             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2815                 wait_for_completion_interruptible_timeout(
2816                                         &conn->tx_half_close_comp,
2817                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2818         }
2819 }
2820
2821 void
2822 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2823                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2824                         bool set_statsn)
2825 {
2826         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2827         hdr->flags              = datain->flags;
2828         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2829                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2830                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2831                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2832                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2833                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2834                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2835                 }
2836         }
2837         hton24(hdr->dlength, datain->length);
2838         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2839                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2840                                 (struct scsi_lun *)&hdr->lun);
2841         else
2842                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2843
2844         hdr->itt                = cmd->init_task_tag;
2845
2846         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2847                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2848         else
2849                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2850         if (set_statsn)
2851                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2852         else
2853                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2854
2855         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2856         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2857         hdr->datasn             = cpu_to_be32(datain->data_sn);
2858         hdr->offset             = cpu_to_be32(datain->offset);
2859
2860         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2861                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2862                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2863                 ntohl(hdr->offset), datain->length, conn->cid);
2864 }
2865 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2866
2867 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2868 {
2869         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2870         struct iscsi_datain datain;
2871         struct iscsi_datain_req *dr;
2872         int eodr = 0, ret;
2873         bool set_statsn = false;
2874
2875         memset(&datain, 0, sizeof(struct iscsi_datain));
2876         dr = iscsit_get_datain_values(cmd, &datain);
2877         if (!dr) {
2878                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2879                                 cmd->init_task_tag);
2880                 return -1;
2881         }
2882         /*
2883          * Be paranoid and double check the logic for now.
2884          */
2885         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2886                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2887                         " datain.length: %u exceeds cmd->data_length: %u\n",
2888                         cmd->init_task_tag, datain.offset, datain.length,
2889                         cmd->se_cmd.data_length);
2890                 return -1;
2891         }
2892
2893         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2894         /*
2895          * Special case for successfully execution w/ both DATAIN
2896          * and Sense Data.
2897          */
2898         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2899             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2900                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2901         else {
2902                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2903                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2904                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2905                         cmd->stat_sn = conn->stat_sn++;
2906                         set_statsn = true;
2907                 } else if (dr->dr_complete ==
2908                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2909                         set_statsn = true;
2910         }
2911
2912         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2913
2914         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2915         if (ret < 0)
2916                 return ret;
2917
2918         if (dr->dr_complete) {
2919                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2920                                 2 : 1;
2921                 iscsit_free_datain_req(cmd, dr);
2922         }
2923
2924         return eodr;
2925 }
2926
2927 int
2928 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2929                         struct iscsi_logout_rsp *hdr)
2930 {
2931         struct iscsit_conn *logout_conn = NULL;
2932         struct iscsi_conn_recovery *cr = NULL;
2933         struct iscsit_session *sess = conn->sess;
2934         /*
2935          * The actual shutting down of Sessions and/or Connections
2936          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2937          * is done in scsi_logout_post_handler().
2938          */
2939         switch (cmd->logout_reason) {
2940         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2941                 pr_debug("iSCSI session logout successful, setting"
2942                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2943                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2944                 break;
2945         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2946                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2947                         break;
2948                 /*
2949                  * For CLOSECONNECTION logout requests carrying
2950                  * a matching logout CID -> local CID, the reference
2951                  * for the local CID will have been incremented in
2952                  * iscsi_logout_closeconnection().
2953                  *
2954                  * For CLOSECONNECTION logout requests carrying
2955                  * a different CID than the connection it arrived
2956                  * on, the connection responding to cmd->logout_cid
2957                  * is stopped in iscsit_logout_post_handler_diffcid().
2958                  */
2959
2960                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2961                         " successful.\n", cmd->logout_cid, conn->cid);
2962                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2963                 break;
2964         case ISCSI_LOGOUT_REASON_RECOVERY:
2965                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2966                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2967                         break;
2968                 /*
2969                  * If the connection is still active from our point of view
2970                  * force connection recovery to occur.
2971                  */
2972                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2973                                 cmd->logout_cid);
2974                 if (logout_conn) {
2975                         iscsit_connection_reinstatement_rcfr(logout_conn);
2976                         iscsit_dec_conn_usage_count(logout_conn);
2977                 }
2978
2979                 cr = iscsit_get_inactive_connection_recovery_entry(
2980                                 conn->sess, cmd->logout_cid);
2981                 if (!cr) {
2982                         pr_err("Unable to locate CID: %hu for"
2983                         " REMOVECONNFORRECOVERY Logout Request.\n",
2984                                 cmd->logout_cid);
2985                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2986                         break;
2987                 }
2988
2989                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2990
2991                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2992                         " for recovery for CID: %hu on CID: %hu successful.\n",
2993                                 cmd->logout_cid, conn->cid);
2994                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2995                 break;
2996         default:
2997                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2998                                 cmd->logout_reason);
2999                 return -1;
3000         }
3001
3002         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
3003         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3004         hdr->response           = cmd->logout_response;
3005         hdr->itt                = cmd->init_task_tag;
3006         cmd->stat_sn            = conn->stat_sn++;
3007         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3008
3009         iscsit_increment_maxcmdsn(cmd, conn->sess);
3010         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3011         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3012
3013         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
3014                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
3015                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
3016                 cmd->logout_cid, conn->cid);
3017
3018         return 0;
3019 }
3020 EXPORT_SYMBOL(iscsit_build_logout_rsp);
3021
3022 static int
3023 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3024 {
3025         int rc;
3026
3027         rc = iscsit_build_logout_rsp(cmd, conn,
3028                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
3029         if (rc < 0)
3030                 return rc;
3031
3032         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3033 }
3034
3035 void
3036 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3037                        struct iscsi_nopin *hdr, bool nopout_response)
3038 {
3039         hdr->opcode             = ISCSI_OP_NOOP_IN;
3040         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3041         hton24(hdr->dlength, cmd->buf_ptr_size);
3042         if (nopout_response)
3043                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3044         hdr->itt                = cmd->init_task_tag;
3045         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3046         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
3047                                   conn->stat_sn;
3048         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3049
3050         if (nopout_response)
3051                 iscsit_increment_maxcmdsn(cmd, conn->sess);
3052
3053         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3054         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3055
3056         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3057                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3058                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3059                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3060 }
3061 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3062
3063 /*
3064  *      Unsolicited NOPIN, either requesting a response or not.
3065  */
3066 static int iscsit_send_unsolicited_nopin(
3067         struct iscsit_cmd *cmd,
3068         struct iscsit_conn *conn,
3069         int want_response)
3070 {
3071         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3072         int ret;
3073
3074         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3075
3076         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3077                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3078
3079         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3080         if (ret < 0)
3081                 return ret;
3082
3083         spin_lock_bh(&cmd->istate_lock);
3084         cmd->i_state = want_response ?
3085                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3086         spin_unlock_bh(&cmd->istate_lock);
3087
3088         return 0;
3089 }
3090
3091 static int
3092 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3093 {
3094         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3095
3096         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3097
3098         /*
3099          * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3100          * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3101          */
3102         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3103
3104         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3105                                                      cmd->buf_ptr,
3106                                                      cmd->buf_ptr_size);
3107 }
3108
3109 static int iscsit_send_r2t(
3110         struct iscsit_cmd *cmd,
3111         struct iscsit_conn *conn)
3112 {
3113         struct iscsi_r2t *r2t;
3114         struct iscsi_r2t_rsp *hdr;
3115         int ret;
3116
3117         r2t = iscsit_get_r2t_from_list(cmd);
3118         if (!r2t)
3119                 return -1;
3120
3121         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3122         memset(hdr, 0, ISCSI_HDR_LEN);
3123         hdr->opcode             = ISCSI_OP_R2T;
3124         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3125         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3126                         (struct scsi_lun *)&hdr->lun);
3127         hdr->itt                = cmd->init_task_tag;
3128         if (conn->conn_transport->iscsit_get_r2t_ttt)
3129                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3130         else
3131                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3132         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3133         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3134         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3135         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3136         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3137         hdr->data_offset        = cpu_to_be32(r2t->offset);
3138         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3139
3140         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3141                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3142                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3143                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3144                         r2t->offset, r2t->xfer_len, conn->cid);
3145
3146         spin_lock_bh(&cmd->r2t_lock);
3147         r2t->sent_r2t = 1;
3148         spin_unlock_bh(&cmd->r2t_lock);
3149
3150         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3151         if (ret < 0) {
3152                 return ret;
3153         }
3154
3155         spin_lock_bh(&cmd->dataout_timeout_lock);
3156         iscsit_start_dataout_timer(cmd, conn);
3157         spin_unlock_bh(&cmd->dataout_timeout_lock);
3158
3159         return 0;
3160 }
3161
3162 /*
3163  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3164  *              connection recovery.
3165  */
3166 int iscsit_build_r2ts_for_cmd(
3167         struct iscsit_conn *conn,
3168         struct iscsit_cmd *cmd,
3169         bool recovery)
3170 {
3171         int first_r2t = 1;
3172         u32 offset = 0, xfer_len = 0;
3173
3174         spin_lock_bh(&cmd->r2t_lock);
3175         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3176                 spin_unlock_bh(&cmd->r2t_lock);
3177                 return 0;
3178         }
3179
3180         if (conn->sess->sess_ops->DataSequenceInOrder &&
3181             !recovery)
3182                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3183
3184         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3185                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3186                         offset = cmd->r2t_offset;
3187
3188                         if (first_r2t && recovery) {
3189                                 int new_data_end = offset +
3190                                         conn->sess->sess_ops->MaxBurstLength -
3191                                         cmd->next_burst_len;
3192
3193                                 if (new_data_end > cmd->se_cmd.data_length)
3194                                         xfer_len = cmd->se_cmd.data_length - offset;
3195                                 else
3196                                         xfer_len =
3197                                                 conn->sess->sess_ops->MaxBurstLength -
3198                                                 cmd->next_burst_len;
3199                         } else {
3200                                 int new_data_end = offset +
3201                                         conn->sess->sess_ops->MaxBurstLength;
3202
3203                                 if (new_data_end > cmd->se_cmd.data_length)
3204                                         xfer_len = cmd->se_cmd.data_length - offset;
3205                                 else
3206                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3207                         }
3208
3209                         if ((s32)xfer_len < 0) {
3210                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3211                                 break;
3212                         }
3213
3214                         cmd->r2t_offset += xfer_len;
3215
3216                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3217                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3218                 } else {
3219                         struct iscsi_seq *seq;
3220
3221                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3222                         if (!seq) {
3223                                 spin_unlock_bh(&cmd->r2t_lock);
3224                                 return -1;
3225                         }
3226
3227                         offset = seq->offset;
3228                         xfer_len = seq->xfer_len;
3229
3230                         if (cmd->seq_send_order == cmd->seq_count)
3231                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3232                 }
3233                 cmd->outstanding_r2ts++;
3234                 first_r2t = 0;
3235
3236                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3237                         spin_unlock_bh(&cmd->r2t_lock);
3238                         return -1;
3239                 }
3240
3241                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3242                         break;
3243         }
3244         spin_unlock_bh(&cmd->r2t_lock);
3245
3246         return 0;
3247 }
3248 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3249
3250 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3251                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3252 {
3253         if (inc_stat_sn)
3254                 cmd->stat_sn = conn->stat_sn++;
3255
3256         atomic_long_inc(&conn->sess->rsp_pdus);
3257
3258         memset(hdr, 0, ISCSI_HDR_LEN);
3259         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3260         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3261         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3262                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3263                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3264         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3265                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3266                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3267         }
3268         hdr->response           = cmd->iscsi_response;
3269         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3270         hdr->itt                = cmd->init_task_tag;
3271         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3272
3273         iscsit_increment_maxcmdsn(cmd, conn->sess);
3274         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3275         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3276
3277         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3278                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3279                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3280                 cmd->se_cmd.scsi_status, conn->cid);
3281 }
3282 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3283
3284 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3285 {
3286         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3287         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3288         void *data_buf = NULL;
3289         u32 padding = 0, data_buf_len = 0;
3290
3291         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3292
3293         /*
3294          * Attach SENSE DATA payload to iSCSI Response PDU
3295          */
3296         if (cmd->se_cmd.sense_buffer &&
3297            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3298             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3299                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3300                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3301
3302                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3303                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3304                 data_buf = cmd->sense_buffer;
3305                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3306
3307                 if (padding) {
3308                         memset(cmd->sense_buffer +
3309                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3310                         pr_debug("Adding %u bytes of padding to"
3311                                 " SENSE.\n", padding);
3312                 }
3313
3314                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3315                                 " Response PDU\n",
3316                                 cmd->se_cmd.scsi_sense_length);
3317         }
3318
3319         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3320                                                      data_buf_len);
3321 }
3322
3323 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3324 {
3325         switch (se_tmr->response) {
3326         case TMR_FUNCTION_COMPLETE:
3327                 return ISCSI_TMF_RSP_COMPLETE;
3328         case TMR_TASK_DOES_NOT_EXIST:
3329                 return ISCSI_TMF_RSP_NO_TASK;
3330         case TMR_LUN_DOES_NOT_EXIST:
3331                 return ISCSI_TMF_RSP_NO_LUN;
3332         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3333                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3334         case TMR_FUNCTION_REJECTED:
3335         default:
3336                 return ISCSI_TMF_RSP_REJECTED;
3337         }
3338 }
3339
3340 void
3341 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3342                           struct iscsi_tm_rsp *hdr)
3343 {
3344         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3345
3346         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3347         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3348         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3349         hdr->itt                = cmd->init_task_tag;
3350         cmd->stat_sn            = conn->stat_sn++;
3351         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3352
3353         iscsit_increment_maxcmdsn(cmd, conn->sess);
3354         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3355         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3356
3357         pr_debug("Built Task Management Response ITT: 0x%08x,"
3358                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3359                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3360 }
3361 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3362
3363 static int
3364 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3365 {
3366         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3367
3368         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3369
3370         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3371 }
3372
3373 #define SENDTARGETS_BUF_LIMIT 32768U
3374
3375 static int
3376 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3377                                   enum iscsit_transport_type network_transport,
3378                                   int skip_bytes, bool *completed)
3379 {
3380         char *payload = NULL;
3381         struct iscsit_conn *conn = cmd->conn;
3382         struct iscsi_portal_group *tpg;
3383         struct iscsi_tiqn *tiqn;
3384         struct iscsi_tpg_np *tpg_np;
3385         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3386         int target_name_printed;
3387         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3388         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3389         bool active;
3390
3391         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3392                          SENDTARGETS_BUF_LIMIT);
3393
3394         payload = kzalloc(buffer_len, GFP_KERNEL);
3395         if (!payload)
3396                 return -ENOMEM;
3397
3398         /*
3399          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3400          * explicit case..
3401          */
3402         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3403                 text_ptr = strchr(text_in, '=');
3404                 if (!text_ptr) {
3405                         pr_err("Unable to locate '=' string in text_in:"
3406                                " %s\n", text_in);
3407                         kfree(payload);
3408                         return -EINVAL;
3409                 }
3410                 /*
3411                  * Skip over '=' character..
3412                  */
3413                 text_ptr += 1;
3414         }
3415
3416         spin_lock(&tiqn_lock);
3417         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3418                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3419                      strcmp(tiqn->tiqn, text_ptr)) {
3420                         continue;
3421                 }
3422
3423                 target_name_printed = 0;
3424
3425                 spin_lock(&tiqn->tiqn_tpg_lock);
3426                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3427
3428                         /* If demo_mode_discovery=0 and generate_node_acls=0
3429                          * (demo mode dislabed) do not return
3430                          * TargetName+TargetAddress unless a NodeACL exists.
3431                          */
3432
3433                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3434                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3435                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3436                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3437                                 continue;
3438                         }
3439
3440                         spin_lock(&tpg->tpg_state_lock);
3441                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3442                         spin_unlock(&tpg->tpg_state_lock);
3443
3444                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3445                                 continue;
3446
3447                         spin_lock(&tpg->tpg_np_lock);
3448                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3449                                                 tpg_np_list) {
3450                                 struct iscsi_np *np = tpg_np->tpg_np;
3451                                 struct sockaddr_storage *sockaddr;
3452
3453                                 if (np->np_network_transport != network_transport)
3454                                         continue;
3455
3456                                 if (!target_name_printed) {
3457                                         len = sprintf(buf, "TargetName=%s",
3458                                                       tiqn->tiqn);
3459                                         len += 1;
3460
3461                                         if ((len + payload_len) > buffer_len) {
3462                                                 spin_unlock(&tpg->tpg_np_lock);
3463                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3464                                                 end_of_buf = 1;
3465                                                 goto eob;
3466                                         }
3467
3468                                         if (skip_bytes && len <= skip_bytes) {
3469                                                 skip_bytes -= len;
3470                                         } else {
3471                                                 memcpy(payload + payload_len, buf, len);
3472                                                 payload_len += len;
3473                                                 target_name_printed = 1;
3474                                                 if (len > skip_bytes)
3475                                                         skip_bytes = 0;
3476                                         }
3477                                 }
3478
3479                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3480                                         sockaddr = &conn->local_sockaddr;
3481                                 else
3482                                         sockaddr = &np->np_sockaddr;
3483
3484                                 len = sprintf(buf, "TargetAddress="
3485                                               "%pISpc,%hu",
3486                                               sockaddr,
3487                                               tpg->tpgt);
3488                                 len += 1;
3489
3490                                 if ((len + payload_len) > buffer_len) {
3491                                         spin_unlock(&tpg->tpg_np_lock);
3492                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3493                                         end_of_buf = 1;
3494                                         goto eob;
3495                                 }
3496
3497                                 if (skip_bytes && len <= skip_bytes) {
3498                                         skip_bytes -= len;
3499                                 } else {
3500                                         memcpy(payload + payload_len, buf, len);
3501                                         payload_len += len;
3502                                         if (len > skip_bytes)
3503                                                 skip_bytes = 0;
3504                                 }
3505                         }
3506                         spin_unlock(&tpg->tpg_np_lock);
3507                 }
3508                 spin_unlock(&tiqn->tiqn_tpg_lock);
3509 eob:
3510                 if (end_of_buf) {
3511                         *completed = false;
3512                         break;
3513                 }
3514
3515                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3516                         break;
3517         }
3518         spin_unlock(&tiqn_lock);
3519
3520         cmd->buf_ptr = payload;
3521
3522         return payload_len;
3523 }
3524
3525 int
3526 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3527                       struct iscsi_text_rsp *hdr,
3528                       enum iscsit_transport_type network_transport)
3529 {
3530         int text_length, padding;
3531         bool completed = true;
3532
3533         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3534                                                         cmd->read_data_done,
3535                                                         &completed);
3536         if (text_length < 0)
3537                 return text_length;
3538
3539         if (completed) {
3540                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3541         } else {
3542                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3543                 cmd->read_data_done += text_length;
3544                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3545                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3546         }
3547         hdr->opcode = ISCSI_OP_TEXT_RSP;
3548         padding = ((-text_length) & 3);
3549         hton24(hdr->dlength, text_length);
3550         hdr->itt = cmd->init_task_tag;
3551         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3552         cmd->stat_sn = conn->stat_sn++;
3553         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3554
3555         iscsit_increment_maxcmdsn(cmd, conn->sess);
3556         /*
3557          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3558          * correctly increment MaxCmdSN for each response answering a
3559          * non immediate text request with a valid CmdSN.
3560          */
3561         cmd->maxcmdsn_inc = 0;
3562         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3563         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3564
3565         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3566                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3567                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3568                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3569                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3570
3571         return text_length + padding;
3572 }
3573 EXPORT_SYMBOL(iscsit_build_text_rsp);
3574
3575 static int iscsit_send_text_rsp(
3576         struct iscsit_cmd *cmd,
3577         struct iscsit_conn *conn)
3578 {
3579         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3580         int text_length;
3581
3582         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3583                                 conn->conn_transport->transport_type);
3584         if (text_length < 0)
3585                 return text_length;
3586
3587         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3588                                                      cmd->buf_ptr,
3589                                                      text_length);
3590 }
3591
3592 void
3593 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3594                     struct iscsi_reject *hdr)
3595 {
3596         hdr->opcode             = ISCSI_OP_REJECT;
3597         hdr->reason             = cmd->reject_reason;
3598         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3599         hton24(hdr->dlength, ISCSI_HDR_LEN);
3600         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3601         cmd->stat_sn            = conn->stat_sn++;
3602         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3603         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3604         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3605
3606 }
3607 EXPORT_SYMBOL(iscsit_build_reject);
3608
3609 static int iscsit_send_reject(
3610         struct iscsit_cmd *cmd,
3611         struct iscsit_conn *conn)
3612 {
3613         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3614
3615         iscsit_build_reject(cmd, conn, hdr);
3616
3617         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3618                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3619
3620         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3621                                                      cmd->buf_ptr,
3622                                                      ISCSI_HDR_LEN);
3623 }
3624
3625 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3626 {
3627         int ord, cpu;
3628         cpumask_var_t conn_allowed_cpumask;
3629
3630         /*
3631          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3632          * within iscsit_start_kthreads()
3633          *
3634          * Here we use bitmap_id to determine which CPU that this
3635          * iSCSI connection's RX/TX threads will be scheduled to
3636          * execute upon.
3637          */
3638         if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3639                 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3640                 for_each_online_cpu(cpu) {
3641                         if (ord-- == 0) {
3642                                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3643                                 return;
3644                         }
3645                 }
3646         } else {
3647                 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3648                         cpu_online_mask);
3649
3650                 cpumask_clear(conn->conn_cpumask);
3651                 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3652                 for_each_cpu(cpu, conn_allowed_cpumask) {
3653                         if (ord-- == 0) {
3654                                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3655                                 free_cpumask_var(conn_allowed_cpumask);
3656                                 return;
3657                         }
3658                 }
3659                 free_cpumask_var(conn_allowed_cpumask);
3660         }
3661         /*
3662          * This should never be reached..
3663          */
3664         dump_stack();
3665         cpumask_setall(conn->conn_cpumask);
3666 }
3667
3668 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3669 {
3670         /*
3671          * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3672          * connection's RX/TX threads update conn->allowed_cpumask.
3673          */
3674         if (!cpumask_equal(iscsit_global->allowed_cpumask,
3675                            conn->allowed_cpumask)) {
3676                 iscsit_thread_get_cpumask(conn);
3677                 conn->conn_tx_reset_cpumask = 1;
3678                 conn->conn_rx_reset_cpumask = 1;
3679                 cpumask_copy(conn->allowed_cpumask,
3680                              iscsit_global->allowed_cpumask);
3681         }
3682 }
3683
3684 void iscsit_thread_check_cpumask(
3685         struct iscsit_conn *conn,
3686         struct task_struct *p,
3687         int mode)
3688 {
3689         /*
3690          * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3691          * at the same time. The RX thread might be faster and return from
3692          * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3693          * Then the TX thread sets it back to 1.
3694          * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3695          * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3696          */
3697         iscsit_thread_reschedule(conn);
3698
3699         /*
3700          * mode == 1 signals iscsi_target_tx_thread() usage.
3701          * mode == 0 signals iscsi_target_rx_thread() usage.
3702          */
3703         if (mode == 1) {
3704                 if (!conn->conn_tx_reset_cpumask)
3705                         return;
3706         } else {
3707                 if (!conn->conn_rx_reset_cpumask)
3708                         return;
3709         }
3710
3711         /*
3712          * Update the CPU mask for this single kthread so that
3713          * both TX and RX kthreads are scheduled to run on the
3714          * same CPU.
3715          */
3716         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3717         if (mode == 1)
3718                 conn->conn_tx_reset_cpumask = 0;
3719         else
3720                 conn->conn_rx_reset_cpumask = 0;
3721 }
3722 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3723
3724 int
3725 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3726 {
3727         int ret;
3728
3729         switch (state) {
3730         case ISTATE_SEND_R2T:
3731                 ret = iscsit_send_r2t(cmd, conn);
3732                 if (ret < 0)
3733                         goto err;
3734                 break;
3735         case ISTATE_REMOVE:
3736                 spin_lock_bh(&conn->cmd_lock);
3737                 list_del_init(&cmd->i_conn_node);
3738                 spin_unlock_bh(&conn->cmd_lock);
3739
3740                 iscsit_free_cmd(cmd, false);
3741                 break;
3742         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3743                 iscsit_mod_nopin_response_timer(conn);
3744                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3745                 if (ret < 0)
3746                         goto err;
3747                 break;
3748         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3749                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3750                 if (ret < 0)
3751                         goto err;
3752                 break;
3753         default:
3754                 pr_err("Unknown Opcode: 0x%02x ITT:"
3755                        " 0x%08x, i_state: %d on CID: %hu\n",
3756                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3757                        conn->cid);
3758                 goto err;
3759         }
3760
3761         return 0;
3762
3763 err:
3764         return -1;
3765 }
3766 EXPORT_SYMBOL(iscsit_immediate_queue);
3767
3768 static int
3769 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3770 {
3771         struct iscsit_transport *t = conn->conn_transport;
3772         struct iscsi_queue_req *qr;
3773         struct iscsit_cmd *cmd;
3774         u8 state;
3775         int ret;
3776
3777         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3778                 atomic_set(&conn->check_immediate_queue, 0);
3779                 cmd = qr->cmd;
3780                 state = qr->state;
3781                 kmem_cache_free(lio_qr_cache, qr);
3782
3783                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3784                 if (ret < 0)
3785                         return ret;
3786         }
3787
3788         return 0;
3789 }
3790
3791 int
3792 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3793 {
3794         int ret;
3795
3796 check_rsp_state:
3797         switch (state) {
3798         case ISTATE_SEND_DATAIN:
3799                 ret = iscsit_send_datain(cmd, conn);
3800                 if (ret < 0)
3801                         goto err;
3802                 else if (!ret)
3803                         /* more drs */
3804                         goto check_rsp_state;
3805                 else if (ret == 1) {
3806                         /* all done */
3807                         spin_lock_bh(&cmd->istate_lock);
3808                         cmd->i_state = ISTATE_SENT_STATUS;
3809                         spin_unlock_bh(&cmd->istate_lock);
3810
3811                         if (atomic_read(&conn->check_immediate_queue))
3812                                 return 1;
3813
3814                         return 0;
3815                 } else if (ret == 2) {
3816                         /* Still must send status,
3817                            SCF_TRANSPORT_TASK_SENSE was set */
3818                         spin_lock_bh(&cmd->istate_lock);
3819                         cmd->i_state = ISTATE_SEND_STATUS;
3820                         spin_unlock_bh(&cmd->istate_lock);
3821                         state = ISTATE_SEND_STATUS;
3822                         goto check_rsp_state;
3823                 }
3824
3825                 break;
3826         case ISTATE_SEND_STATUS:
3827         case ISTATE_SEND_STATUS_RECOVERY:
3828                 ret = iscsit_send_response(cmd, conn);
3829                 break;
3830         case ISTATE_SEND_LOGOUTRSP:
3831                 ret = iscsit_send_logout(cmd, conn);
3832                 break;
3833         case ISTATE_SEND_ASYNCMSG:
3834                 ret = iscsit_send_conn_drop_async_message(
3835                         cmd, conn);
3836                 break;
3837         case ISTATE_SEND_NOPIN:
3838                 ret = iscsit_send_nopin(cmd, conn);
3839                 break;
3840         case ISTATE_SEND_REJECT:
3841                 ret = iscsit_send_reject(cmd, conn);
3842                 break;
3843         case ISTATE_SEND_TASKMGTRSP:
3844                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3845                 if (ret != 0)
3846                         break;
3847                 ret = iscsit_tmr_post_handler(cmd, conn);
3848                 if (ret != 0)
3849                         iscsit_fall_back_to_erl0(conn->sess);
3850                 break;
3851         case ISTATE_SEND_TEXTRSP:
3852                 ret = iscsit_send_text_rsp(cmd, conn);
3853                 break;
3854         default:
3855                 pr_err("Unknown Opcode: 0x%02x ITT:"
3856                        " 0x%08x, i_state: %d on CID: %hu\n",
3857                        cmd->iscsi_opcode, cmd->init_task_tag,
3858                        state, conn->cid);
3859                 goto err;
3860         }
3861         if (ret < 0)
3862                 goto err;
3863
3864         switch (state) {
3865         case ISTATE_SEND_LOGOUTRSP:
3866                 if (!iscsit_logout_post_handler(cmd, conn))
3867                         return -ECONNRESET;
3868                 fallthrough;
3869         case ISTATE_SEND_STATUS:
3870         case ISTATE_SEND_ASYNCMSG:
3871         case ISTATE_SEND_NOPIN:
3872         case ISTATE_SEND_STATUS_RECOVERY:
3873         case ISTATE_SEND_TEXTRSP:
3874         case ISTATE_SEND_TASKMGTRSP:
3875         case ISTATE_SEND_REJECT:
3876                 spin_lock_bh(&cmd->istate_lock);
3877                 cmd->i_state = ISTATE_SENT_STATUS;
3878                 spin_unlock_bh(&cmd->istate_lock);
3879                 break;
3880         default:
3881                 pr_err("Unknown Opcode: 0x%02x ITT:"
3882                        " 0x%08x, i_state: %d on CID: %hu\n",
3883                        cmd->iscsi_opcode, cmd->init_task_tag,
3884                        cmd->i_state, conn->cid);
3885                 goto err;
3886         }
3887
3888         if (atomic_read(&conn->check_immediate_queue))
3889                 return 1;
3890
3891         return 0;
3892
3893 err:
3894         return -1;
3895 }
3896 EXPORT_SYMBOL(iscsit_response_queue);
3897
3898 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3899 {
3900         struct iscsit_transport *t = conn->conn_transport;
3901         struct iscsi_queue_req *qr;
3902         struct iscsit_cmd *cmd;
3903         u8 state;
3904         int ret;
3905
3906         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3907                 cmd = qr->cmd;
3908                 state = qr->state;
3909                 kmem_cache_free(lio_qr_cache, qr);
3910
3911                 ret = t->iscsit_response_queue(conn, cmd, state);
3912                 if (ret == 1 || ret < 0)
3913                         return ret;
3914         }
3915
3916         return 0;
3917 }
3918
3919 int iscsi_target_tx_thread(void *arg)
3920 {
3921         int ret = 0;
3922         struct iscsit_conn *conn = arg;
3923         bool conn_freed = false;
3924
3925         /*
3926          * Allow ourselves to be interrupted by SIGINT so that a
3927          * connection recovery / failure event can be triggered externally.
3928          */
3929         allow_signal(SIGINT);
3930
3931         while (!kthread_should_stop()) {
3932                 /*
3933                  * Ensure that both TX and RX per connection kthreads
3934                  * are scheduled to run on the same CPU.
3935                  */
3936                 iscsit_thread_check_cpumask(conn, current, 1);
3937
3938                 wait_event_interruptible(conn->queues_wq,
3939                                          !iscsit_conn_all_queues_empty(conn));
3940
3941                 if (signal_pending(current))
3942                         goto transport_err;
3943
3944 get_immediate:
3945                 ret = iscsit_handle_immediate_queue(conn);
3946                 if (ret < 0)
3947                         goto transport_err;
3948
3949                 ret = iscsit_handle_response_queue(conn);
3950                 if (ret == 1) {
3951                         goto get_immediate;
3952                 } else if (ret == -ECONNRESET) {
3953                         conn_freed = true;
3954                         goto out;
3955                 } else if (ret < 0) {
3956                         goto transport_err;
3957                 }
3958         }
3959
3960 transport_err:
3961         /*
3962          * Avoid the normal connection failure code-path if this connection
3963          * is still within LOGIN mode, and iscsi_np process context is
3964          * responsible for cleaning up the early connection failure.
3965          */
3966         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3967                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3968 out:
3969         if (!conn_freed) {
3970                 while (!kthread_should_stop()) {
3971                         msleep(100);
3972                 }
3973         }
3974         return 0;
3975 }
3976
3977 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3978 {
3979         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3980         struct iscsit_cmd *cmd;
3981         int ret = 0;
3982
3983         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3984         case ISCSI_OP_SCSI_CMD:
3985                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3986                 if (!cmd)
3987                         goto reject;
3988
3989                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3990                 break;
3991         case ISCSI_OP_SCSI_DATA_OUT:
3992                 ret = iscsit_handle_data_out(conn, buf);
3993                 break;
3994         case ISCSI_OP_NOOP_OUT:
3995                 cmd = NULL;
3996                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3997                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3998                         if (!cmd)
3999                                 goto reject;
4000                 }
4001                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4002                 break;
4003         case ISCSI_OP_SCSI_TMFUNC:
4004                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4005                 if (!cmd)
4006                         goto reject;
4007
4008                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4009                 break;
4010         case ISCSI_OP_TEXT:
4011                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4012                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4013                         if (!cmd)
4014                                 goto reject;
4015                 } else {
4016                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4017                         if (!cmd)
4018                                 goto reject;
4019                 }
4020
4021                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4022                 break;
4023         case ISCSI_OP_LOGOUT:
4024                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4025                 if (!cmd)
4026                         goto reject;
4027
4028                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4029                 if (ret > 0)
4030                         wait_for_completion_timeout(&conn->conn_logout_comp,
4031                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4032                 break;
4033         case ISCSI_OP_SNACK:
4034                 ret = iscsit_handle_snack(conn, buf);
4035                 break;
4036         default:
4037                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4038                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4039                         pr_err("Cannot recover from unknown"
4040                         " opcode while ERL=0, closing iSCSI connection.\n");
4041                         return -1;
4042                 }
4043                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4044                        " closing iSCSI connection.\n");
4045                 ret = -1;
4046                 break;
4047         }
4048
4049         return ret;
4050 reject:
4051         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4052 }
4053
4054 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4055 {
4056         bool ret;
4057
4058         spin_lock_bh(&conn->state_lock);
4059         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4060         spin_unlock_bh(&conn->state_lock);
4061
4062         return ret;
4063 }
4064
4065 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4066 {
4067         int ret;
4068         u8 *buffer, *tmp_buf, opcode;
4069         u32 checksum = 0, digest = 0;
4070         struct iscsi_hdr *hdr;
4071         struct kvec iov;
4072
4073         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4074         if (!buffer)
4075                 return;
4076
4077         while (!kthread_should_stop()) {
4078                 /*
4079                  * Ensure that both TX and RX per connection kthreads
4080                  * are scheduled to run on the same CPU.
4081                  */
4082                 iscsit_thread_check_cpumask(conn, current, 0);
4083
4084                 memset(&iov, 0, sizeof(struct kvec));
4085
4086                 iov.iov_base    = buffer;
4087                 iov.iov_len     = ISCSI_HDR_LEN;
4088
4089                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4090                 if (ret != ISCSI_HDR_LEN) {
4091                         iscsit_rx_thread_wait_for_tcp(conn);
4092                         break;
4093                 }
4094
4095                 hdr = (struct iscsi_hdr *) buffer;
4096                 if (hdr->hlength) {
4097                         iov.iov_len = hdr->hlength * 4;
4098                         tmp_buf = krealloc(buffer,
4099                                           ISCSI_HDR_LEN + iov.iov_len,
4100                                           GFP_KERNEL);
4101                         if (!tmp_buf)
4102                                 break;
4103
4104                         buffer = tmp_buf;
4105                         iov.iov_base = &buffer[ISCSI_HDR_LEN];
4106
4107                         ret = rx_data(conn, &iov, 1, iov.iov_len);
4108                         if (ret != iov.iov_len) {
4109                                 iscsit_rx_thread_wait_for_tcp(conn);
4110                                 break;
4111                         }
4112                 }
4113
4114                 if (conn->conn_ops->HeaderDigest) {
4115                         iov.iov_base    = &digest;
4116                         iov.iov_len     = ISCSI_CRC_LEN;
4117
4118                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4119                         if (ret != ISCSI_CRC_LEN) {
4120                                 iscsit_rx_thread_wait_for_tcp(conn);
4121                                 break;
4122                         }
4123
4124                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
4125                                                   ISCSI_HDR_LEN, 0, NULL,
4126                                                   &checksum);
4127
4128                         if (digest != checksum) {
4129                                 pr_err("HeaderDigest CRC32C failed,"
4130                                         " received 0x%08x, computed 0x%08x\n",
4131                                         digest, checksum);
4132                                 /*
4133                                  * Set the PDU to 0xff so it will intentionally
4134                                  * hit default in the switch below.
4135                                  */
4136                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4137                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4138                         } else {
4139                                 pr_debug("Got HeaderDigest CRC32C"
4140                                                 " 0x%08x\n", checksum);
4141                         }
4142                 }
4143
4144                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4145                         break;
4146
4147                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4148
4149                 if (conn->sess->sess_ops->SessionType &&
4150                    ((!(opcode & ISCSI_OP_TEXT)) ||
4151                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4152                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4153                         " while in Discovery Session, rejecting.\n", opcode);
4154                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4155                                           buffer);
4156                         break;
4157                 }
4158
4159                 ret = iscsi_target_rx_opcode(conn, buffer);
4160                 if (ret < 0)
4161                         break;
4162         }
4163
4164         kfree(buffer);
4165 }
4166
4167 int iscsi_target_rx_thread(void *arg)
4168 {
4169         int rc;
4170         struct iscsit_conn *conn = arg;
4171         bool conn_freed = false;
4172
4173         /*
4174          * Allow ourselves to be interrupted by SIGINT so that a
4175          * connection recovery / failure event can be triggered externally.
4176          */
4177         allow_signal(SIGINT);
4178         /*
4179          * Wait for iscsi_post_login_handler() to complete before allowing
4180          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4181          */
4182         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4183         if (rc < 0 || iscsi_target_check_conn_state(conn))
4184                 goto out;
4185
4186         if (!conn->conn_transport->iscsit_get_rx_pdu)
4187                 return 0;
4188
4189         conn->conn_transport->iscsit_get_rx_pdu(conn);
4190
4191         if (!signal_pending(current))
4192                 atomic_set(&conn->transport_failed, 1);
4193         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4194
4195 out:
4196         if (!conn_freed) {
4197                 while (!kthread_should_stop()) {
4198                         msleep(100);
4199                 }
4200         }
4201
4202         return 0;
4203 }
4204
4205 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4206 {
4207         LIST_HEAD(tmp_list);
4208         struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4209         struct iscsit_session *sess = conn->sess;
4210         /*
4211          * We expect this function to only ever be called from either RX or TX
4212          * thread context via iscsit_close_connection() once the other context
4213          * has been reset -> returned sleeping pre-handler state.
4214          */
4215         spin_lock_bh(&conn->cmd_lock);
4216         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4217
4218         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4219                 struct se_cmd *se_cmd = &cmd->se_cmd;
4220
4221                 if (se_cmd->se_tfo != NULL) {
4222                         spin_lock_irq(&se_cmd->t_state_lock);
4223                         if (se_cmd->transport_state & CMD_T_ABORTED) {
4224                                 /*
4225                                  * LIO's abort path owns the cleanup for this,
4226                                  * so put it back on the list and let
4227                                  * aborted_task handle it.
4228                                  */
4229                                 list_move_tail(&cmd->i_conn_node,
4230                                                &conn->conn_cmd_list);
4231                         } else {
4232                                 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4233                         }
4234                         spin_unlock_irq(&se_cmd->t_state_lock);
4235                 }
4236         }
4237         spin_unlock_bh(&conn->cmd_lock);
4238
4239         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4240                 list_del_init(&cmd->i_conn_node);
4241
4242                 iscsit_increment_maxcmdsn(cmd, sess);
4243                 iscsit_free_cmd(cmd, true);
4244
4245         }
4246 }
4247
4248 static void iscsit_stop_timers_for_cmds(
4249         struct iscsit_conn *conn)
4250 {
4251         struct iscsit_cmd *cmd;
4252
4253         spin_lock_bh(&conn->cmd_lock);
4254         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4255                 if (cmd->data_direction == DMA_TO_DEVICE)
4256                         iscsit_stop_dataout_timer(cmd);
4257         }
4258         spin_unlock_bh(&conn->cmd_lock);
4259 }
4260
4261 int iscsit_close_connection(
4262         struct iscsit_conn *conn)
4263 {
4264         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4265         struct iscsit_session   *sess = conn->sess;
4266
4267         pr_debug("Closing iSCSI connection CID %hu on SID:"
4268                 " %u\n", conn->cid, sess->sid);
4269         /*
4270          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4271          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4272          * sleeping and the logout response never got sent because the
4273          * connection failed.
4274          *
4275          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4276          * to signal logout response TX interrupt completion.  Go ahead and skip
4277          * this for iser since isert_rx_opcode() does not wait on logout failure,
4278          * and to avoid iscsit_conn pointer dereference in iser-target code.
4279          */
4280         if (!conn->conn_transport->rdma_shutdown)
4281                 complete(&conn->conn_logout_comp);
4282
4283         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4284                 if (conn->tx_thread &&
4285                     cmpxchg(&conn->tx_thread_active, true, false)) {
4286                         send_sig(SIGINT, conn->tx_thread, 1);
4287                         kthread_stop(conn->tx_thread);
4288                 }
4289         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4290                 if (conn->rx_thread &&
4291                     cmpxchg(&conn->rx_thread_active, true, false)) {
4292                         send_sig(SIGINT, conn->rx_thread, 1);
4293                         kthread_stop(conn->rx_thread);
4294                 }
4295         }
4296
4297         spin_lock(&iscsit_global->ts_bitmap_lock);
4298         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4299                               get_order(1));
4300         spin_unlock(&iscsit_global->ts_bitmap_lock);
4301
4302         iscsit_stop_timers_for_cmds(conn);
4303         iscsit_stop_nopin_response_timer(conn);
4304         iscsit_stop_nopin_timer(conn);
4305
4306         if (conn->conn_transport->iscsit_wait_conn)
4307                 conn->conn_transport->iscsit_wait_conn(conn);
4308
4309         /*
4310          * During Connection recovery drop unacknowledged out of order
4311          * commands for this connection, and prepare the other commands
4312          * for reallegiance.
4313          *
4314          * During normal operation clear the out of order commands (but
4315          * do not free the struct iscsi_ooo_cmdsn's) and release all
4316          * struct iscsit_cmds.
4317          */
4318         if (atomic_read(&conn->connection_recovery)) {
4319                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4320                 iscsit_prepare_cmds_for_reallegiance(conn);
4321         } else {
4322                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4323                 iscsit_release_commands_from_conn(conn);
4324         }
4325         iscsit_free_queue_reqs_for_conn(conn);
4326
4327         /*
4328          * Handle decrementing session or connection usage count if
4329          * a logout response was not able to be sent because the
4330          * connection failed.  Fall back to Session Recovery here.
4331          */
4332         if (atomic_read(&conn->conn_logout_remove)) {
4333                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4334                         iscsit_dec_conn_usage_count(conn);
4335                         iscsit_dec_session_usage_count(sess);
4336                 }
4337                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4338                         iscsit_dec_conn_usage_count(conn);
4339
4340                 atomic_set(&conn->conn_logout_remove, 0);
4341                 atomic_set(&sess->session_reinstatement, 0);
4342                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4343         }
4344
4345         spin_lock_bh(&sess->conn_lock);
4346         list_del(&conn->conn_list);
4347
4348         /*
4349          * Attempt to let the Initiator know this connection failed by
4350          * sending an Connection Dropped Async Message on another
4351          * active connection.
4352          */
4353         if (atomic_read(&conn->connection_recovery))
4354                 iscsit_build_conn_drop_async_message(conn);
4355
4356         spin_unlock_bh(&sess->conn_lock);
4357
4358         /*
4359          * If connection reinstatement is being performed on this connection,
4360          * up the connection reinstatement semaphore that is being blocked on
4361          * in iscsit_cause_connection_reinstatement().
4362          */
4363         spin_lock_bh(&conn->state_lock);
4364         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4365                 spin_unlock_bh(&conn->state_lock);
4366                 complete(&conn->conn_wait_comp);
4367                 wait_for_completion(&conn->conn_post_wait_comp);
4368                 spin_lock_bh(&conn->state_lock);
4369         }
4370
4371         /*
4372          * If connection reinstatement is being performed on this connection
4373          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4374          * connection wait rcfr semaphore that is being blocked on
4375          * an iscsit_connection_reinstatement_rcfr().
4376          */
4377         if (atomic_read(&conn->connection_wait_rcfr)) {
4378                 spin_unlock_bh(&conn->state_lock);
4379                 complete(&conn->conn_wait_rcfr_comp);
4380                 wait_for_completion(&conn->conn_post_wait_comp);
4381                 spin_lock_bh(&conn->state_lock);
4382         }
4383         atomic_set(&conn->connection_reinstatement, 1);
4384         spin_unlock_bh(&conn->state_lock);
4385
4386         /*
4387          * If any other processes are accessing this connection pointer we
4388          * must wait until they have completed.
4389          */
4390         iscsit_check_conn_usage_count(conn);
4391
4392         ahash_request_free(conn->conn_tx_hash);
4393         if (conn->conn_rx_hash) {
4394                 struct crypto_ahash *tfm;
4395
4396                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4397                 ahash_request_free(conn->conn_rx_hash);
4398                 crypto_free_ahash(tfm);
4399         }
4400
4401         if (conn->sock)
4402                 sock_release(conn->sock);
4403
4404         if (conn->conn_transport->iscsit_free_conn)
4405                 conn->conn_transport->iscsit_free_conn(conn);
4406
4407         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4408         conn->conn_state = TARG_CONN_STATE_FREE;
4409         iscsit_free_conn(conn);
4410
4411         spin_lock_bh(&sess->conn_lock);
4412         atomic_dec(&sess->nconn);
4413         pr_debug("Decremented iSCSI connection count to %d from node:"
4414                 " %s\n", atomic_read(&sess->nconn),
4415                 sess->sess_ops->InitiatorName);
4416         /*
4417          * Make sure that if one connection fails in an non ERL=2 iSCSI
4418          * Session that they all fail.
4419          */
4420         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4421              !atomic_read(&sess->session_logout))
4422                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4423
4424         /*
4425          * If this was not the last connection in the session, and we are
4426          * performing session reinstatement or falling back to ERL=0, call
4427          * iscsit_stop_session() without sleeping to shutdown the other
4428          * active connections.
4429          */
4430         if (atomic_read(&sess->nconn)) {
4431                 if (!atomic_read(&sess->session_reinstatement) &&
4432                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4433                         spin_unlock_bh(&sess->conn_lock);
4434                         return 0;
4435                 }
4436                 if (!atomic_read(&sess->session_stop_active)) {
4437                         atomic_set(&sess->session_stop_active, 1);
4438                         spin_unlock_bh(&sess->conn_lock);
4439                         iscsit_stop_session(sess, 0, 0);
4440                         return 0;
4441                 }
4442                 spin_unlock_bh(&sess->conn_lock);
4443                 return 0;
4444         }
4445
4446         /*
4447          * If this was the last connection in the session and one of the
4448          * following is occurring:
4449          *
4450          * Session Reinstatement is not being performed, and are falling back
4451          * to ERL=0 call iscsit_close_session().
4452          *
4453          * Session Logout was requested.  iscsit_close_session() will be called
4454          * elsewhere.
4455          *
4456          * Session Continuation is not being performed, start the Time2Retain
4457          * handler and check if sleep_on_sess_wait_sem is active.
4458          */
4459         if (!atomic_read(&sess->session_reinstatement) &&
4460              atomic_read(&sess->session_fall_back_to_erl0)) {
4461                 spin_unlock_bh(&sess->conn_lock);
4462                 complete_all(&sess->session_wait_comp);
4463                 iscsit_close_session(sess, true);
4464
4465                 return 0;
4466         } else if (atomic_read(&sess->session_logout)) {
4467                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4468                 sess->session_state = TARG_SESS_STATE_FREE;
4469
4470                 if (atomic_read(&sess->session_close)) {
4471                         spin_unlock_bh(&sess->conn_lock);
4472                         complete_all(&sess->session_wait_comp);
4473                         iscsit_close_session(sess, true);
4474                 } else {
4475                         spin_unlock_bh(&sess->conn_lock);
4476                 }
4477
4478                 return 0;
4479         } else {
4480                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4481                 sess->session_state = TARG_SESS_STATE_FAILED;
4482
4483                 if (!atomic_read(&sess->session_continuation))
4484                         iscsit_start_time2retain_handler(sess);
4485
4486                 if (atomic_read(&sess->session_close)) {
4487                         spin_unlock_bh(&sess->conn_lock);
4488                         complete_all(&sess->session_wait_comp);
4489                         iscsit_close_session(sess, true);
4490                 } else {
4491                         spin_unlock_bh(&sess->conn_lock);
4492                 }
4493
4494                 return 0;
4495         }
4496 }
4497
4498 /*
4499  * If the iSCSI Session for the iSCSI Initiator Node exists,
4500  * forcefully shutdown the iSCSI NEXUS.
4501  */
4502 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4503 {
4504         struct iscsi_portal_group *tpg = sess->tpg;
4505         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4506
4507         if (atomic_read(&sess->nconn)) {
4508                 pr_err("%d connection(s) still exist for iSCSI session"
4509                         " to %s\n", atomic_read(&sess->nconn),
4510                         sess->sess_ops->InitiatorName);
4511                 BUG();
4512         }
4513
4514         spin_lock_bh(&se_tpg->session_lock);
4515         atomic_set(&sess->session_logout, 1);
4516         atomic_set(&sess->session_reinstatement, 1);
4517         iscsit_stop_time2retain_timer(sess);
4518         spin_unlock_bh(&se_tpg->session_lock);
4519
4520         /*
4521          * transport_deregister_session_configfs() will clear the
4522          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4523          * can be setting it again with __transport_register_session() in
4524          * iscsi_post_login_handler() again after the iscsit_stop_session()
4525          * completes in iscsi_np context.
4526          */
4527         transport_deregister_session_configfs(sess->se_sess);
4528
4529         /*
4530          * If any other processes are accessing this session pointer we must
4531          * wait until they have completed.  If we are in an interrupt (the
4532          * time2retain handler) and contain and active session usage count we
4533          * restart the timer and exit.
4534          */
4535         if (iscsit_check_session_usage_count(sess, can_sleep)) {
4536                 atomic_set(&sess->session_logout, 0);
4537                 iscsit_start_time2retain_handler(sess);
4538                 return 0;
4539         }
4540
4541         transport_deregister_session(sess->se_sess);
4542
4543         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4544                 iscsit_free_connection_recovery_entries(sess);
4545
4546         iscsit_free_all_ooo_cmdsns(sess);
4547
4548         spin_lock_bh(&se_tpg->session_lock);
4549         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4550         sess->session_state = TARG_SESS_STATE_FREE;
4551         pr_debug("Released iSCSI session from node: %s\n",
4552                         sess->sess_ops->InitiatorName);
4553         tpg->nsessions--;
4554         if (tpg->tpg_tiqn)
4555                 tpg->tpg_tiqn->tiqn_nsessions--;
4556
4557         pr_debug("Decremented number of active iSCSI Sessions on"
4558                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4559
4560         ida_free(&sess_ida, sess->session_index);
4561         kfree(sess->sess_ops);
4562         sess->sess_ops = NULL;
4563         spin_unlock_bh(&se_tpg->session_lock);
4564
4565         kfree(sess);
4566         return 0;
4567 }
4568
4569 static void iscsit_logout_post_handler_closesession(
4570         struct iscsit_conn *conn)
4571 {
4572         struct iscsit_session *sess = conn->sess;
4573         int sleep = 1;
4574         /*
4575          * Traditional iscsi/tcp will invoke this logic from TX thread
4576          * context during session logout, so clear tx_thread_active and
4577          * sleep if iscsit_close_connection() has not already occured.
4578          *
4579          * Since iser-target invokes this logic from it's own workqueue,
4580          * always sleep waiting for RX/TX thread shutdown to complete
4581          * within iscsit_close_connection().
4582          */
4583         if (!conn->conn_transport->rdma_shutdown) {
4584                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4585                 if (!sleep)
4586                         return;
4587         }
4588
4589         atomic_set(&conn->conn_logout_remove, 0);
4590         complete(&conn->conn_logout_comp);
4591
4592         iscsit_dec_conn_usage_count(conn);
4593         atomic_set(&sess->session_close, 1);
4594         iscsit_stop_session(sess, sleep, sleep);
4595         iscsit_dec_session_usage_count(sess);
4596 }
4597
4598 static void iscsit_logout_post_handler_samecid(
4599         struct iscsit_conn *conn)
4600 {
4601         int sleep = 1;
4602
4603         if (!conn->conn_transport->rdma_shutdown) {
4604                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4605                 if (!sleep)
4606                         return;
4607         }
4608
4609         atomic_set(&conn->conn_logout_remove, 0);
4610         complete(&conn->conn_logout_comp);
4611
4612         iscsit_cause_connection_reinstatement(conn, sleep);
4613         iscsit_dec_conn_usage_count(conn);
4614 }
4615
4616 static void iscsit_logout_post_handler_diffcid(
4617         struct iscsit_conn *conn,
4618         u16 cid)
4619 {
4620         struct iscsit_conn *l_conn;
4621         struct iscsit_session *sess = conn->sess;
4622         bool conn_found = false;
4623
4624         if (!sess)
4625                 return;
4626
4627         spin_lock_bh(&sess->conn_lock);
4628         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4629                 if (l_conn->cid == cid) {
4630                         iscsit_inc_conn_usage_count(l_conn);
4631                         conn_found = true;
4632                         break;
4633                 }
4634         }
4635         spin_unlock_bh(&sess->conn_lock);
4636
4637         if (!conn_found)
4638                 return;
4639
4640         if (l_conn->sock)
4641                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4642
4643         spin_lock_bh(&l_conn->state_lock);
4644         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4645         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4646         spin_unlock_bh(&l_conn->state_lock);
4647
4648         iscsit_cause_connection_reinstatement(l_conn, 1);
4649         iscsit_dec_conn_usage_count(l_conn);
4650 }
4651
4652 /*
4653  *      Return of 0 causes the TX thread to restart.
4654  */
4655 int iscsit_logout_post_handler(
4656         struct iscsit_cmd *cmd,
4657         struct iscsit_conn *conn)
4658 {
4659         int ret = 0;
4660
4661         switch (cmd->logout_reason) {
4662         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4663                 switch (cmd->logout_response) {
4664                 case ISCSI_LOGOUT_SUCCESS:
4665                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4666                 default:
4667                         iscsit_logout_post_handler_closesession(conn);
4668                         break;
4669                 }
4670                 break;
4671         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4672                 if (conn->cid == cmd->logout_cid) {
4673                         switch (cmd->logout_response) {
4674                         case ISCSI_LOGOUT_SUCCESS:
4675                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4676                         default:
4677                                 iscsit_logout_post_handler_samecid(conn);
4678                                 break;
4679                         }
4680                 } else {
4681                         switch (cmd->logout_response) {
4682                         case ISCSI_LOGOUT_SUCCESS:
4683                                 iscsit_logout_post_handler_diffcid(conn,
4684                                         cmd->logout_cid);
4685                                 break;
4686                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4687                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4688                         default:
4689                                 break;
4690                         }
4691                         ret = 1;
4692                 }
4693                 break;
4694         case ISCSI_LOGOUT_REASON_RECOVERY:
4695                 switch (cmd->logout_response) {
4696                 case ISCSI_LOGOUT_SUCCESS:
4697                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4698                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4699                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4700                 default:
4701                         break;
4702                 }
4703                 ret = 1;
4704                 break;
4705         default:
4706                 break;
4707
4708         }
4709         return ret;
4710 }
4711 EXPORT_SYMBOL(iscsit_logout_post_handler);
4712
4713 void iscsit_fail_session(struct iscsit_session *sess)
4714 {
4715         struct iscsit_conn *conn;
4716
4717         spin_lock_bh(&sess->conn_lock);
4718         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4719                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4720                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4721         }
4722         spin_unlock_bh(&sess->conn_lock);
4723
4724         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4725         sess->session_state = TARG_SESS_STATE_FAILED;
4726 }
4727
4728 void iscsit_stop_session(
4729         struct iscsit_session *sess,
4730         int session_sleep,
4731         int connection_sleep)
4732 {
4733         u16 conn_count = atomic_read(&sess->nconn);
4734         struct iscsit_conn *conn, *conn_tmp = NULL;
4735         int is_last;
4736
4737         spin_lock_bh(&sess->conn_lock);
4738
4739         if (connection_sleep) {
4740                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4741                                 conn_list) {
4742                         if (conn_count == 0)
4743                                 break;
4744
4745                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4746                                 is_last = 1;
4747                         } else {
4748                                 iscsit_inc_conn_usage_count(conn_tmp);
4749                                 is_last = 0;
4750                         }
4751                         iscsit_inc_conn_usage_count(conn);
4752
4753                         spin_unlock_bh(&sess->conn_lock);
4754                         iscsit_cause_connection_reinstatement(conn, 1);
4755                         spin_lock_bh(&sess->conn_lock);
4756
4757                         iscsit_dec_conn_usage_count(conn);
4758                         if (is_last == 0)
4759                                 iscsit_dec_conn_usage_count(conn_tmp);
4760                         conn_count--;
4761                 }
4762         } else {
4763                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4764                         iscsit_cause_connection_reinstatement(conn, 0);
4765         }
4766
4767         if (session_sleep && atomic_read(&sess->nconn)) {
4768                 spin_unlock_bh(&sess->conn_lock);
4769                 wait_for_completion(&sess->session_wait_comp);
4770         } else
4771                 spin_unlock_bh(&sess->conn_lock);
4772 }
4773
4774 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4775 {
4776         struct iscsit_session *sess;
4777         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4778         struct se_session *se_sess, *se_sess_tmp;
4779         LIST_HEAD(free_list);
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 iscsit_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                     atomic_read(&sess->session_close) ||
4796                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4797                         spin_unlock(&sess->conn_lock);
4798                         continue;
4799                 }
4800                 iscsit_inc_session_usage_count(sess);
4801                 atomic_set(&sess->session_reinstatement, 1);
4802                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4803                 atomic_set(&sess->session_close, 1);
4804                 spin_unlock(&sess->conn_lock);
4805
4806                 list_move_tail(&se_sess->sess_list, &free_list);
4807         }
4808         spin_unlock_bh(&se_tpg->session_lock);
4809
4810         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4811                 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4812
4813                 list_del_init(&se_sess->sess_list);
4814                 iscsit_stop_session(sess, 1, 1);
4815                 iscsit_dec_session_usage_count(sess);
4816                 session_count++;
4817         }
4818
4819         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4820                         " Group: %hu\n", session_count, tpg->tpgt);
4821         return 0;
4822 }
4823
4824 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4825 MODULE_VERSION("4.1.x");
4826 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4827 MODULE_LICENSE("GPL");
4828
4829 module_init(iscsi_target_init_module);
4830 module_exit(iscsi_target_cleanup_module);