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 <[email protected]>
   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/target_core_backend.h>
  30 #include <target/iscsi/iscsi_target_core.h>
  31 #include "iscsi_target_parameters.h"
  32 #include "iscsi_target_seq_pdu_list.h"
  33 #include "iscsi_target_datain_values.h"
  34 #include "iscsi_target_erl0.h"
  35 #include "iscsi_target_erl1.h"
  36 #include "iscsi_target_erl2.h"
  37 #include "iscsi_target_login.h"
  38 #include "iscsi_target_tmr.h"
  39 #include "iscsi_target_tpg.h"
  40 #include "iscsi_target_util.h"
  41 #include "iscsi_target.h"
  42 #include "iscsi_target_device.h"
  43 #include <target/iscsi/iscsi_target_stat.h>
  44
  45 #include <target/iscsi/iscsi_transport.h>
  46
  47 static LIST_HEAD(g_tiqn_list);
  48 static LIST_HEAD(g_np_list);
  49 static DEFINE_SPINLOCK(tiqn_lock);
  50 static DEFINE_MUTEX(np_lock);
  51
  52 static struct idr tiqn_idr;
  53 DEFINE_IDA(sess_ida);
  54 struct mutex auth_id_lock;
  55
  56 struct iscsit_global *iscsit_global;
  57
  58 struct kmem_cache *lio_qr_cache;
  59 struct kmem_cache *lio_dr_cache;
  60 struct kmem_cache *lio_ooo_cache;
  61 struct kmem_cache *lio_r2t_cache;
  62
  63 static int iscsit_handle_immediate_data(struct iscsit_cmd *,
  64                         struct iscsi_scsi_req *, u32);
  65
  66 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  67 {
  68         struct iscsi_tiqn *tiqn = NULL;
  69
  70         spin_lock(&tiqn_lock);
  71         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  72                 if (!strcmp(tiqn->tiqn, buf)) {
  73
  74                         spin_lock(&tiqn->tiqn_state_lock);
  75                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  76                                 tiqn->tiqn_access_count++;
  77                                 spin_unlock(&tiqn->tiqn_state_lock);
  78                                 spin_unlock(&tiqn_lock);
  79                                 return tiqn;
  80                         }
  81                         spin_unlock(&tiqn->tiqn_state_lock);
  82                 }
  83         }
  84         spin_unlock(&tiqn_lock);
  85
  86         return NULL;
  87 }
  88
  89 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  90 {
  91         spin_lock(&tiqn->tiqn_state_lock);
  92         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  93                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  94                 spin_unlock(&tiqn->tiqn_state_lock);
  95                 return 0;
  96         }
  97         spin_unlock(&tiqn->tiqn_state_lock);
  98
  99         return -1;
 100 }
 101
 102 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 103 {
 104         spin_lock(&tiqn->tiqn_state_lock);
 105         tiqn->tiqn_access_count--;
 106         spin_unlock(&tiqn->tiqn_state_lock);
 107 }
 108
 109 /*
 110  * Note that IQN formatting is expected to be done in userspace, and
 111  * no explict IQN format checks are done here.
 112  */
 113 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 114 {
 115         struct iscsi_tiqn *tiqn = NULL;
 116         int ret;
 117
 118         if (strlen(buf) >= ISCSI_IQN_LEN) {
 119                 pr_err("Target IQN exceeds %d bytes\n",
 120                                 ISCSI_IQN_LEN);
 121                 return ERR_PTR(-EINVAL);
 122         }
 123
 124         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 125         if (!tiqn)
 126                 return ERR_PTR(-ENOMEM);
 127
 128         sprintf(tiqn->tiqn, "%s", buf);
 129         INIT_LIST_HEAD(&tiqn->tiqn_list);
 130         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 131         spin_lock_init(&tiqn->tiqn_state_lock);
 132         spin_lock_init(&tiqn->tiqn_tpg_lock);
 133         spin_lock_init(&tiqn->sess_err_stats.lock);
 134         spin_lock_init(&tiqn->login_stats.lock);
 135         spin_lock_init(&tiqn->logout_stats.lock);
 136
 137         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 138
 139         idr_preload(GFP_KERNEL);
 140         spin_lock(&tiqn_lock);
 141
 142         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 143         if (ret < 0) {
 144                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 145                 spin_unlock(&tiqn_lock);
 146                 idr_preload_end();
 147                 kfree(tiqn);
 148                 return ERR_PTR(ret);
 149         }
 150         tiqn->tiqn_index = ret;
 151         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 152
 153         spin_unlock(&tiqn_lock);
 154         idr_preload_end();
 155
 156         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 157
 158         return tiqn;
 159
 160 }
 161
 162 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 163 {
 164         /*
 165          * Wait for accesses to said struct iscsi_tiqn to end.
 166          */
 167         spin_lock(&tiqn->tiqn_state_lock);
 168         while (tiqn->tiqn_access_count != 0) {
 169                 spin_unlock(&tiqn->tiqn_state_lock);
 170                 msleep(10);
 171                 spin_lock(&tiqn->tiqn_state_lock);
 172         }
 173         spin_unlock(&tiqn->tiqn_state_lock);
 174 }
 175
 176 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 177 {
 178         /*
 179          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 180          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 181          * attempts to access this struct iscsi_tiqn will fail from both transport
 182          * fabric and control code paths.
 183          */
 184         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 185                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 186                 return;
 187         }
 188
 189         iscsit_wait_for_tiqn(tiqn);
 190
 191         spin_lock(&tiqn_lock);
 192         list_del(&tiqn->tiqn_list);
 193         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 194         spin_unlock(&tiqn_lock);
 195
 196         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 197                         tiqn->tiqn);
 198         kfree(tiqn);
 199 }
 200
 201 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 202 {
 203         int ret;
 204         /*
 205          * Determine if the network portal is accepting storage traffic.
 206          */
 207         spin_lock_bh(&np->np_thread_lock);
 208         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 209                 spin_unlock_bh(&np->np_thread_lock);
 210                 return -1;
 211         }
 212         spin_unlock_bh(&np->np_thread_lock);
 213         /*
 214          * Determine if the portal group is accepting storage traffic.
 215          */
 216         spin_lock_bh(&tpg->tpg_state_lock);
 217         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 218                 spin_unlock_bh(&tpg->tpg_state_lock);
 219                 return -1;
 220         }
 221         spin_unlock_bh(&tpg->tpg_state_lock);
 222
 223         /*
 224          * Here we serialize access across the TIQN+TPG Tuple.
 225          */
 226         ret = down_interruptible(&tpg->np_login_sem);
 227         if (ret != 0)
 228                 return -1;
 229
 230         spin_lock_bh(&tpg->tpg_state_lock);
 231         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 232                 spin_unlock_bh(&tpg->tpg_state_lock);
 233                 up(&tpg->np_login_sem);
 234                 return -1;
 235         }
 236         spin_unlock_bh(&tpg->tpg_state_lock);
 237
 238         return 0;
 239 }
 240
 241 void iscsit_login_kref_put(struct kref *kref)
 242 {
 243         struct iscsi_tpg_np *tpg_np = container_of(kref,
 244                                 struct iscsi_tpg_np, tpg_np_kref);
 245
 246         complete(&tpg_np->tpg_np_comp);
 247 }
 248
 249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 250                        struct iscsi_tpg_np *tpg_np)
 251 {
 252         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 253
 254         up(&tpg->np_login_sem);
 255
 256         if (tpg_np)
 257                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 258
 259         if (tiqn)
 260                 iscsit_put_tiqn_for_login(tiqn);
 261
 262         return 0;
 263 }
 264
 265 bool iscsit_check_np_match(
 266         struct sockaddr_storage *sockaddr,
 267         struct iscsi_np *np,
 268         int network_transport)
 269 {
 270         struct sockaddr_in *sock_in, *sock_in_e;
 271         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 272         bool ip_match = false;
 273         u16 port, port_e;
 274
 275         if (sockaddr->ss_family == AF_INET6) {
 276                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 277                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 278
 279                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 280                             &sock_in6_e->sin6_addr.in6_u,
 281                             sizeof(struct in6_addr)))
 282                         ip_match = true;
 283
 284                 port = ntohs(sock_in6->sin6_port);
 285                 port_e = ntohs(sock_in6_e->sin6_port);
 286         } else {
 287                 sock_in = (struct sockaddr_in *)sockaddr;
 288                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 289
 290                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 291                         ip_match = true;
 292
 293                 port = ntohs(sock_in->sin_port);
 294                 port_e = ntohs(sock_in_e->sin_port);
 295         }
 296
 297         if (ip_match && (port_e == port) &&
 298             (np->np_network_transport == network_transport))
 299                 return true;
 300
 301         return false;
 302 }
 303
 304 static struct iscsi_np *iscsit_get_np(
 305         struct sockaddr_storage *sockaddr,
 306         int network_transport)
 307 {
 308         struct iscsi_np *np;
 309         bool match;
 310
 311         lockdep_assert_held(&np_lock);
 312
 313         list_for_each_entry(np, &g_np_list, np_list) {
 314                 spin_lock_bh(&np->np_thread_lock);
 315                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 316                         spin_unlock_bh(&np->np_thread_lock);
 317                         continue;
 318                 }
 319
 320                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 321                 if (match) {
 322                         /*
 323                          * Increment the np_exports reference count now to
 324                          * prevent iscsit_del_np() below from being called
 325                          * while iscsi_tpg_add_network_portal() is called.
 326                          */
 327                         np->np_exports++;
 328                         spin_unlock_bh(&np->np_thread_lock);
 329                         return np;
 330                 }
 331                 spin_unlock_bh(&np->np_thread_lock);
 332         }
 333
 334         return NULL;
 335 }
 336
 337 struct iscsi_np *iscsit_add_np(
 338         struct sockaddr_storage *sockaddr,
 339         int network_transport)
 340 {
 341         struct iscsi_np *np;
 342         int ret;
 343
 344         mutex_lock(&np_lock);
 345
 346         /*
 347          * Locate the existing struct iscsi_np if already active..
 348          */
 349         np = iscsit_get_np(sockaddr, network_transport);
 350         if (np) {
 351                 mutex_unlock(&np_lock);
 352                 return np;
 353         }
 354
 355         np = kzalloc(sizeof(*np), GFP_KERNEL);
 356         if (!np) {
 357                 mutex_unlock(&np_lock);
 358                 return ERR_PTR(-ENOMEM);
 359         }
 360
 361         np->np_flags |= NPF_IP_NETWORK;
 362         np->np_network_transport = network_transport;
 363         spin_lock_init(&np->np_thread_lock);
 364         init_completion(&np->np_restart_comp);
 365         INIT_LIST_HEAD(&np->np_list);
 366
 367         ret = iscsi_target_setup_login_socket(np, sockaddr);
 368         if (ret != 0) {
 369                 kfree(np);
 370                 mutex_unlock(&np_lock);
 371                 return ERR_PTR(ret);
 372         }
 373
 374         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 375         if (IS_ERR(np->np_thread)) {
 376                 pr_err("Unable to create kthread: iscsi_np\n");
 377                 ret = PTR_ERR(np->np_thread);
 378                 kfree(np);
 379                 mutex_unlock(&np_lock);
 380                 return ERR_PTR(ret);
 381         }
 382         /*
 383          * Increment the np_exports reference count now to prevent
 384          * iscsit_del_np() below from being run while a new call to
 385          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 386          * active.  We don't need to hold np->np_thread_lock at this
 387          * point because iscsi_np has not been added to g_np_list yet.
 388          */
 389         np->np_exports = 1;
 390         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 391
 392         list_add_tail(&np->np_list, &g_np_list);
 393         mutex_unlock(&np_lock);
 394
 395         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 396                 &np->np_sockaddr, np->np_transport->name);
 397
 398         return np;
 399 }
 400
 401 int iscsit_reset_np_thread(
 402         struct iscsi_np *np,
 403         struct iscsi_tpg_np *tpg_np,
 404         struct iscsi_portal_group *tpg,
 405         bool shutdown)
 406 {
 407         spin_lock_bh(&np->np_thread_lock);
 408         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 409                 spin_unlock_bh(&np->np_thread_lock);
 410                 return 0;
 411         }
 412         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 413         atomic_inc(&np->np_reset_count);
 414
 415         if (np->np_thread) {
 416                 spin_unlock_bh(&np->np_thread_lock);
 417                 send_sig(SIGINT, np->np_thread, 1);
 418                 wait_for_completion(&np->np_restart_comp);
 419                 spin_lock_bh(&np->np_thread_lock);
 420         }
 421         spin_unlock_bh(&np->np_thread_lock);
 422
 423         if (tpg_np && shutdown) {
 424                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 425
 426                 wait_for_completion(&tpg_np->tpg_np_comp);
 427         }
 428
 429         return 0;
 430 }
 431
 432 static void iscsit_free_np(struct iscsi_np *np)
 433 {
 434         if (np->np_socket)
 435                 sock_release(np->np_socket);
 436 }
 437
 438 int iscsit_del_np(struct iscsi_np *np)
 439 {
 440         spin_lock_bh(&np->np_thread_lock);
 441         np->np_exports--;
 442         if (np->np_exports) {
 443                 np->enabled = true;
 444                 spin_unlock_bh(&np->np_thread_lock);
 445                 return 0;
 446         }
 447         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 448         spin_unlock_bh(&np->np_thread_lock);
 449
 450         if (np->np_thread) {
 451                 /*
 452                  * We need to send the signal to wakeup Linux/Net
 453                  * which may be sleeping in sock_accept()..
 454                  */
 455                 send_sig(SIGINT, np->np_thread, 1);
 456                 kthread_stop(np->np_thread);
 457                 np->np_thread = NULL;
 458         }
 459
 460         np->np_transport->iscsit_free_np(np);
 461
 462         mutex_lock(&np_lock);
 463         list_del(&np->np_list);
 464         mutex_unlock(&np_lock);
 465
 466         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 467                 &np->np_sockaddr, np->np_transport->name);
 468
 469         iscsit_put_transport(np->np_transport);
 470         kfree(np);
 471         return 0;
 472 }
 473
 474 static void iscsit_get_rx_pdu(struct iscsit_conn *);
 475
 476 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
 477 {
 478         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 479 }
 480 EXPORT_SYMBOL(iscsit_queue_rsp);
 481
 482 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
 483 {
 484         spin_lock_bh(&conn->cmd_lock);
 485         if (!list_empty(&cmd->i_conn_node))
 486                 list_del_init(&cmd->i_conn_node);
 487         spin_unlock_bh(&conn->cmd_lock);
 488
 489         __iscsit_free_cmd(cmd, true);
 490 }
 491 EXPORT_SYMBOL(iscsit_aborted_task);
 492
 493 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 494                                       u32, u32, const void *, void *);
 495 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *);
 496
 497 static int
 498 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 499                           const void *data_buf, u32 data_buf_len)
 500 {
 501         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 502         struct kvec *iov;
 503         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 504         int ret;
 505
 506         iov = &cmd->iov_misc[0];
 507         iov[niov].iov_base      = cmd->pdu;
 508         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 509
 510         if (conn->conn_ops->HeaderDigest) {
 511                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 512
 513                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 514                                           ISCSI_HDR_LEN, 0, NULL,
 515                                           header_digest);
 516
 517                 iov[0].iov_len += ISCSI_CRC_LEN;
 518                 tx_size += ISCSI_CRC_LEN;
 519                 pr_debug("Attaching CRC32C HeaderDigest"
 520                          " to opcode 0x%x 0x%08x\n",
 521                          hdr->opcode, *header_digest);
 522         }
 523
 524         if (data_buf_len) {
 525                 u32 padding = ((-data_buf_len) & 3);
 526
 527                 iov[niov].iov_base      = (void *)data_buf;
 528                 iov[niov++].iov_len     = data_buf_len;
 529                 tx_size += data_buf_len;
 530
 531                 if (padding != 0) {
 532                         iov[niov].iov_base = &cmd->pad_bytes;
 533                         iov[niov++].iov_len = padding;
 534                         tx_size += padding;
 535                         pr_debug("Attaching %u additional"
 536                                  " padding bytes.\n", padding);
 537                 }
 538
 539                 if (conn->conn_ops->DataDigest) {
 540                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 541                                                   data_buf, data_buf_len,
 542                                                   padding, &cmd->pad_bytes,
 543                                                   &cmd->data_crc);
 544
 545                         iov[niov].iov_base = &cmd->data_crc;
 546                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 547                         tx_size += ISCSI_CRC_LEN;
 548                         pr_debug("Attached DataDigest for %u"
 549                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 550                                  data_buf_len, hdr->opcode, cmd->data_crc);
 551                 }
 552         }
 553
 554         cmd->iov_misc_count = niov;
 555         cmd->tx_size = tx_size;
 556
 557         ret = iscsit_send_tx_data(cmd, conn, 1);
 558         if (ret < 0) {
 559                 iscsit_tx_thread_wait_for_tcp(conn);
 560                 return ret;
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
 567                             u32 data_offset, u32 data_length);
 568 static void iscsit_unmap_iovec(struct iscsit_cmd *);
 569 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *,
 570                                     u32, u32, u32, u8 *);
 571 static int
 572 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 573                        const struct iscsi_datain *datain)
 574 {
 575         struct kvec *iov;
 576         u32 iov_count = 0, tx_size = 0;
 577         int ret, iov_ret;
 578
 579         iov = &cmd->iov_data[0];
 580         iov[iov_count].iov_base = cmd->pdu;
 581         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 582         tx_size += ISCSI_HDR_LEN;
 583
 584         if (conn->conn_ops->HeaderDigest) {
 585                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 586
 587                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 588                                           ISCSI_HDR_LEN, 0, NULL,
 589                                           header_digest);
 590
 591                 iov[0].iov_len += ISCSI_CRC_LEN;
 592                 tx_size += ISCSI_CRC_LEN;
 593
 594                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 595                          *header_digest);
 596         }
 597
 598         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
 599                                    cmd->orig_iov_data_count - (iov_count + 2),
 600                                    datain->offset, datain->length);
 601         if (iov_ret < 0)
 602                 return -1;
 603
 604         iov_count += iov_ret;
 605         tx_size += datain->length;
 606
 607         cmd->padding = ((-datain->length) & 3);
 608         if (cmd->padding) {
 609                 iov[iov_count].iov_base         = cmd->pad_bytes;
 610                 iov[iov_count++].iov_len        = cmd->padding;
 611                 tx_size += cmd->padding;
 612
 613                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 614         }
 615
 616         if (conn->conn_ops->DataDigest) {
 617                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 618                                                          cmd, datain->offset,
 619                                                          datain->length,
 620                                                          cmd->padding,
 621                                                          cmd->pad_bytes);
 622
 623                 iov[iov_count].iov_base = &cmd->data_crc;
 624                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 625                 tx_size += ISCSI_CRC_LEN;
 626
 627                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 628                          datain->length + cmd->padding, cmd->data_crc);
 629         }
 630
 631         cmd->iov_data_count = iov_count;
 632         cmd->tx_size = tx_size;
 633
 634         ret = iscsit_fe_sendpage_sg(cmd, conn);
 635
 636         iscsit_unmap_iovec(cmd);
 637
 638         if (ret < 0) {
 639                 iscsit_tx_thread_wait_for_tcp(conn);
 640                 return ret;
 641         }
 642
 643         return 0;
 644 }
 645
 646 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 647                            struct iscsi_datain_req *dr, const void *buf,
 648                            u32 buf_len)
 649 {
 650         if (dr)
 651                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 652         else
 653                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 654 }
 655
 656 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn)
 657 {
 658         return TARGET_PROT_NORMAL;
 659 }
 660
 661 static struct iscsit_transport iscsi_target_transport = {
 662         .name                   = "iSCSI/TCP",
 663         .transport_type         = ISCSI_TCP,
 664         .rdma_shutdown          = false,
 665         .owner                  = NULL,
 666         .iscsit_setup_np        = iscsit_setup_np,
 667         .iscsit_accept_np       = iscsit_accept_np,
 668         .iscsit_free_np         = iscsit_free_np,
 669         .iscsit_get_login_rx    = iscsit_get_login_rx,
 670         .iscsit_put_login_tx    = iscsit_put_login_tx,
 671         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 672         .iscsit_immediate_queue = iscsit_immediate_queue,
 673         .iscsit_response_queue  = iscsit_response_queue,
 674         .iscsit_queue_data_in   = iscsit_queue_rsp,
 675         .iscsit_queue_status    = iscsit_queue_rsp,
 676         .iscsit_aborted_task    = iscsit_aborted_task,
 677         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 678         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 679         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 680 };
 681
 682 static int __init iscsi_target_init_module(void)
 683 {
 684         int ret = 0, size;
 685
 686         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 687         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 688         if (!iscsit_global)
 689                 return -1;
 690
 691         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 692         mutex_init(&auth_id_lock);
 693         idr_init(&tiqn_idr);
 694
 695         ret = target_register_template(&iscsi_ops);
 696         if (ret)
 697                 goto out;
 698
 699         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 700         iscsit_global->ts_bitmap = vzalloc(size);
 701         if (!iscsit_global->ts_bitmap)
 702                 goto configfs_out;
 703
 704         if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) {
 705                 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n");
 706                 goto bitmap_out;
 707         }
 708         cpumask_setall(iscsit_global->allowed_cpumask);
 709
 710         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 711                         sizeof(struct iscsi_queue_req),
 712                         __alignof__(struct iscsi_queue_req), 0, NULL);
 713         if (!lio_qr_cache) {
 714                 pr_err("Unable to kmem_cache_create() for"
 715                                 " lio_qr_cache\n");
 716                 goto cpumask_out;
 717         }
 718
 719         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 720                         sizeof(struct iscsi_datain_req),
 721                         __alignof__(struct iscsi_datain_req), 0, NULL);
 722         if (!lio_dr_cache) {
 723                 pr_err("Unable to kmem_cache_create() for"
 724                                 " lio_dr_cache\n");
 725                 goto qr_out;
 726         }
 727
 728         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 729                         sizeof(struct iscsi_ooo_cmdsn),
 730                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 731         if (!lio_ooo_cache) {
 732                 pr_err("Unable to kmem_cache_create() for"
 733                                 " lio_ooo_cache\n");
 734                 goto dr_out;
 735         }
 736
 737         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 738                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 739                         0, NULL);
 740         if (!lio_r2t_cache) {
 741                 pr_err("Unable to kmem_cache_create() for"
 742                                 " lio_r2t_cache\n");
 743                 goto ooo_out;
 744         }
 745
 746         iscsit_register_transport(&iscsi_target_transport);
 747
 748         if (iscsit_load_discovery_tpg() < 0)
 749                 goto r2t_out;
 750
 751         return ret;
 752 r2t_out:
 753         iscsit_unregister_transport(&iscsi_target_transport);
 754         kmem_cache_destroy(lio_r2t_cache);
 755 ooo_out:
 756         kmem_cache_destroy(lio_ooo_cache);
 757 dr_out:
 758         kmem_cache_destroy(lio_dr_cache);
 759 qr_out:
 760         kmem_cache_destroy(lio_qr_cache);
 761 cpumask_out:
 762         free_cpumask_var(iscsit_global->allowed_cpumask);
 763 bitmap_out:
 764         vfree(iscsit_global->ts_bitmap);
 765 configfs_out:
 766         /* XXX: this probably wants it to be it's own unwind step.. */
 767         if (iscsit_global->discovery_tpg)
 768                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 769         target_unregister_template(&iscsi_ops);
 770 out:
 771         kfree(iscsit_global);
 772         return -ENOMEM;
 773 }
 774
 775 static void __exit iscsi_target_cleanup_module(void)
 776 {
 777         iscsit_release_discovery_tpg();
 778         iscsit_unregister_transport(&iscsi_target_transport);
 779         kmem_cache_destroy(lio_qr_cache);
 780         kmem_cache_destroy(lio_dr_cache);
 781         kmem_cache_destroy(lio_ooo_cache);
 782         kmem_cache_destroy(lio_r2t_cache);
 783
 784         /*
 785          * Shutdown discovery sessions and disable discovery TPG
 786          */
 787         if (iscsit_global->discovery_tpg)
 788                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 789
 790         target_unregister_template(&iscsi_ops);
 791
 792         free_cpumask_var(iscsit_global->allowed_cpumask);
 793         vfree(iscsit_global->ts_bitmap);
 794         kfree(iscsit_global);
 795 }
 796
 797 int iscsit_add_reject(
 798         struct iscsit_conn *conn,
 799         u8 reason,
 800         unsigned char *buf)
 801 {
 802         struct iscsit_cmd *cmd;
 803
 804         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 805         if (!cmd)
 806                 return -1;
 807
 808         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 809         cmd->reject_reason = reason;
 810
 811         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 812         if (!cmd->buf_ptr) {
 813                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 814                 iscsit_free_cmd(cmd, false);
 815                 return -1;
 816         }
 817
 818         spin_lock_bh(&conn->cmd_lock);
 819         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 820         spin_unlock_bh(&conn->cmd_lock);
 821
 822         cmd->i_state = ISTATE_SEND_REJECT;
 823         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 824
 825         return -1;
 826 }
 827 EXPORT_SYMBOL(iscsit_add_reject);
 828
 829 static int iscsit_add_reject_from_cmd(
 830         struct iscsit_cmd *cmd,
 831         u8 reason,
 832         bool add_to_conn,
 833         unsigned char *buf)
 834 {
 835         struct iscsit_conn *conn;
 836         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 837
 838         if (!cmd->conn) {
 839                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 840                                 cmd->init_task_tag);
 841                 return -1;
 842         }
 843         conn = cmd->conn;
 844
 845         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 846         cmd->reject_reason = reason;
 847
 848         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 849         if (!cmd->buf_ptr) {
 850                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 851                 iscsit_free_cmd(cmd, false);
 852                 return -1;
 853         }
 854
 855         if (add_to_conn) {
 856                 spin_lock_bh(&conn->cmd_lock);
 857                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 858                 spin_unlock_bh(&conn->cmd_lock);
 859         }
 860
 861         cmd->i_state = ISTATE_SEND_REJECT;
 862         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 863         /*
 864          * Perform the kref_put now if se_cmd has already been setup by
 865          * scsit_setup_scsi_cmd()
 866          */
 867         if (do_put) {
 868                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 869                 target_put_sess_cmd(&cmd->se_cmd);
 870         }
 871         return -1;
 872 }
 873
 874 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason,
 875                                  unsigned char *buf)
 876 {
 877         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 878 }
 879
 880 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf)
 881 {
 882         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 883 }
 884 EXPORT_SYMBOL(iscsit_reject_cmd);
 885
 886 /*
 887  * Map some portion of the allocated scatterlist to an iovec, suitable for
 888  * kernel sockets to copy data in/out.
 889  */
 890 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
 891                             u32 data_offset, u32 data_length)
 892 {
 893         u32 i = 0, orig_data_length = data_length;
 894         struct scatterlist *sg;
 895         unsigned int page_off;
 896
 897         /*
 898          * We know each entry in t_data_sg contains a page.
 899          */
 900         u32 ent = data_offset / PAGE_SIZE;
 901
 902         if (!data_length)
 903                 return 0;
 904
 905         if (ent >= cmd->se_cmd.t_data_nents) {
 906                 pr_err("Initial page entry out-of-bounds\n");
 907                 goto overflow;
 908         }
 909
 910         sg = &cmd->se_cmd.t_data_sg[ent];
 911         page_off = (data_offset % PAGE_SIZE);
 912
 913         cmd->first_data_sg = sg;
 914         cmd->first_data_sg_off = page_off;
 915
 916         while (data_length) {
 917                 u32 cur_len;
 918
 919                 if (WARN_ON_ONCE(!sg || i >= nvec))
 920                         goto overflow;
 921
 922                 cur_len = min_t(u32, data_length, sg->length - page_off);
 923
 924                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 925                 iov[i].iov_len = cur_len;
 926
 927                 data_length -= cur_len;
 928                 page_off = 0;
 929                 sg = sg_next(sg);
 930                 i++;
 931         }
 932
 933         cmd->kmapped_nents = i;
 934
 935         return i;
 936
 937 overflow:
 938         pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
 939                data_offset, orig_data_length, i, nvec);
 940         for_each_sg(cmd->se_cmd.t_data_sg, sg,
 941                     cmd->se_cmd.t_data_nents, i) {
 942                 pr_err("[%d] off %d len %d\n",
 943                        i, sg->offset, sg->length);
 944         }
 945         return -1;
 946 }
 947
 948 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd)
 949 {
 950         u32 i;
 951         struct scatterlist *sg;
 952
 953         sg = cmd->first_data_sg;
 954
 955         for (i = 0; i < cmd->kmapped_nents; i++)
 956                 kunmap(sg_page(&sg[i]));
 957 }
 958
 959 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn)
 960 {
 961         LIST_HEAD(ack_list);
 962         struct iscsit_cmd *cmd, *cmd_p;
 963
 964         conn->exp_statsn = exp_statsn;
 965
 966         if (conn->sess->sess_ops->RDMAExtensions)
 967                 return;
 968
 969         spin_lock_bh(&conn->cmd_lock);
 970         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 971                 spin_lock(&cmd->istate_lock);
 972                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 973                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 974                         cmd->i_state = ISTATE_REMOVE;
 975                         spin_unlock(&cmd->istate_lock);
 976                         list_move_tail(&cmd->i_conn_node, &ack_list);
 977                         continue;
 978                 }
 979                 spin_unlock(&cmd->istate_lock);
 980         }
 981         spin_unlock_bh(&conn->cmd_lock);
 982
 983         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 984                 list_del_init(&cmd->i_conn_node);
 985                 iscsit_free_cmd(cmd, false);
 986         }
 987 }
 988
 989 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd)
 990 {
 991         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 992
 993         iov_count += ISCSI_IOV_DATA_BUFFER;
 994         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 995         if (!cmd->iov_data)
 996                 return -ENOMEM;
 997
 998         cmd->orig_iov_data_count = iov_count;
 999         return 0;
1000 }
1001
1002 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1003                           unsigned char *buf)
1004 {
1005         int data_direction, payload_length;
1006         struct iscsi_ecdb_ahdr *ecdb_ahdr;
1007         struct iscsi_scsi_req *hdr;
1008         int iscsi_task_attr;
1009         unsigned char *cdb;
1010         int sam_task_attr;
1011
1012         atomic_long_inc(&conn->sess->cmd_pdus);
1013
1014         hdr                     = (struct iscsi_scsi_req *) buf;
1015         payload_length          = ntoh24(hdr->dlength);
1016
1017         /* FIXME; Add checks for AdditionalHeaderSegment */
1018
1019         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1020             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1021                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1022                                 " not set. Bad iSCSI Initiator.\n");
1023                 return iscsit_add_reject_cmd(cmd,
1024                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1025         }
1026
1027         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1028              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1029                 /*
1030                  * From RFC-3720 Section 10.3.1:
1031                  *
1032                  * "Either or both of R and W MAY be 1 when either the
1033                  *  Expected Data Transfer Length and/or Bidirectional Read
1034                  *  Expected Data Transfer Length are 0"
1035                  *
1036                  * For this case, go ahead and clear the unnecssary bits
1037                  * to avoid any confusion with ->data_direction.
1038                  */
1039                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1040                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1041
1042                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1043                         " set when Expected Data Transfer Length is 0 for"
1044                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1045         }
1046
1047         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1048             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1049                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1050                         " MUST be set if Expected Data Transfer Length is not 0."
1051                         " Bad iSCSI Initiator\n");
1052                 return iscsit_add_reject_cmd(cmd,
1053                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1054         }
1055
1056         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1057             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1058                 pr_err("Bidirectional operations not supported!\n");
1059                 return iscsit_add_reject_cmd(cmd,
1060                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1061         }
1062
1063         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1064                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1065                                 " Scsi Command PDU.\n");
1066                 return iscsit_add_reject_cmd(cmd,
1067                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1068         }
1069
1070         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1071                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1072                         " protocol error.\n", payload_length);
1073                 return iscsit_add_reject_cmd(cmd,
1074                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1075         }
1076
1077         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1078             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1079                 pr_err("Expected Data Transfer Length and Length of"
1080                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1081                         " bit is not set protocol error\n");
1082                 return iscsit_add_reject_cmd(cmd,
1083                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1084         }
1085
1086         if (payload_length > be32_to_cpu(hdr->data_length)) {
1087                 pr_err("DataSegmentLength: %u is greater than"
1088                         " EDTL: %u, protocol error.\n", payload_length,
1089                                 hdr->data_length);
1090                 return iscsit_add_reject_cmd(cmd,
1091                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1092         }
1093
1094         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1095                 pr_err("DataSegmentLength: %u is greater than"
1096                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1097                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1098                 return iscsit_add_reject_cmd(cmd,
1099                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1100         }
1101
1102         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1103                 pr_err("DataSegmentLength: %u is greater than"
1104                         " FirstBurstLength: %u, protocol error.\n",
1105                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1106                 return iscsit_add_reject_cmd(cmd,
1107                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1108         }
1109
1110         cdb = hdr->cdb;
1111
1112         if (hdr->hlength) {
1113                 ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1);
1114                 if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) {
1115                         pr_err("Additional Header Segment type %d not supported!\n",
1116                                ecdb_ahdr->ahstype);
1117                         return iscsit_add_reject_cmd(cmd,
1118                                 ISCSI_REASON_CMD_NOT_SUPPORTED, buf);
1119                 }
1120
1121                 cdb = kmalloc(be16_to_cpu(ecdb_ahdr->ahslength) + 15,
1122                               GFP_KERNEL);
1123                 if (cdb == NULL)
1124                         return iscsit_add_reject_cmd(cmd,
1125                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1126                 memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE);
1127                 memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb,
1128                        be16_to_cpu(ecdb_ahdr->ahslength) - 1);
1129         }
1130
1131         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1132                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1133                           DMA_NONE;
1134
1135         cmd->data_direction = data_direction;
1136         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1137         /*
1138          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1139          */
1140         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1141             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1142                 sam_task_attr = TCM_SIMPLE_TAG;
1143         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1144                 sam_task_attr = TCM_ORDERED_TAG;
1145         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1146                 sam_task_attr = TCM_HEAD_TAG;
1147         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1148                 sam_task_attr = TCM_ACA_TAG;
1149         else {
1150                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1151                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1152                 sam_task_attr = TCM_SIMPLE_TAG;
1153         }
1154
1155         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1156         cmd->i_state            = ISTATE_NEW_CMD;
1157         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1158         cmd->immediate_data     = (payload_length) ? 1 : 0;
1159         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1160                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1161         if (cmd->unsolicited_data)
1162                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1163
1164         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1165         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1166                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1167         else
1168                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1169         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1170         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1171         cmd->first_burst_len    = payload_length;
1172
1173         if (!conn->sess->sess_ops->RDMAExtensions &&
1174              cmd->data_direction == DMA_FROM_DEVICE) {
1175                 struct iscsi_datain_req *dr;
1176
1177                 dr = iscsit_allocate_datain_req();
1178                 if (!dr) {
1179                         if (cdb != hdr->cdb)
1180                                 kfree(cdb);
1181                         return iscsit_add_reject_cmd(cmd,
1182                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1183                 }
1184
1185                 iscsit_attach_datain_req(cmd, dr);
1186         }
1187
1188         /*
1189          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1190          */
1191         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1192                           conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1193                           cmd->data_direction, sam_task_attr,
1194                           cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun),
1195                           conn->cmd_cnt);
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         return 0;
1238 }
1239 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1240
1241 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1242 {
1243         iscsit_set_dataout_sequence_values(cmd);
1244
1245         spin_lock_bh(&cmd->dataout_timeout_lock);
1246         iscsit_start_dataout_timer(cmd, cmd->conn);
1247         spin_unlock_bh(&cmd->dataout_timeout_lock);
1248 }
1249 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1250
1251 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1252                             struct iscsi_scsi_req *hdr)
1253 {
1254         int cmdsn_ret = 0;
1255         /*
1256          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1257          * the Immediate Bit is not set, and no Immediate
1258          * Data is attached.
1259          *
1260          * A PDU/CmdSN carrying Immediate Data can only
1261          * be processed after the DataCRC has passed.
1262          * If the DataCRC fails, the CmdSN MUST NOT
1263          * be acknowledged. (See below)
1264          */
1265         if (!cmd->immediate_data) {
1266                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1267                                         (unsigned char *)hdr, hdr->cmdsn);
1268                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1269                         return -1;
1270                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1271                         target_put_sess_cmd(&cmd->se_cmd);
1272                         return 0;
1273                 }
1274         }
1275
1276         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1277
1278         /*
1279          * If no Immediate Data is attached, it's OK to return now.
1280          */
1281         if (!cmd->immediate_data) {
1282                 if (!cmd->sense_reason && cmd->unsolicited_data)
1283                         iscsit_set_unsolicited_dataout(cmd);
1284                 if (!cmd->sense_reason)
1285                         return 0;
1286
1287                 target_put_sess_cmd(&cmd->se_cmd);
1288                 return 0;
1289         }
1290
1291         /*
1292          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1293          * execution.  These exceptions are processed in CmdSN order using
1294          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1295          */
1296         if (cmd->sense_reason)
1297                 return 1;
1298         /*
1299          * Call directly into transport_generic_new_cmd() to perform
1300          * the backend memory allocation.
1301          */
1302         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1303         if (cmd->sense_reason)
1304                 return 1;
1305
1306         return 0;
1307 }
1308 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1309
1310 static int
1311 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1312                           bool dump_payload)
1313 {
1314         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1315         int rc;
1316
1317         /*
1318          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1319          */
1320         if (dump_payload) {
1321                 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1322                                  cmd->first_burst_len);
1323
1324                 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1325                          cmd->se_cmd.data_length, cmd->write_data_done,
1326                          cmd->first_burst_len, length);
1327                 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1328                 pr_debug("Finished dumping immediate data\n");
1329                 if (rc < 0)
1330                         immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1331         } else {
1332                 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1333                                                          cmd->first_burst_len);
1334         }
1335
1336         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1337                 /*
1338                  * A PDU/CmdSN carrying Immediate Data passed
1339                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1340                  * Immediate Bit is not set.
1341                  */
1342                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1343                                         (unsigned char *)hdr, hdr->cmdsn);
1344                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1345                         return -1;
1346
1347                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1348                         target_put_sess_cmd(&cmd->se_cmd);
1349
1350                         return 0;
1351                 } else if (cmd->unsolicited_data)
1352                         iscsit_set_unsolicited_dataout(cmd);
1353
1354         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1355                 /*
1356                  * Immediate Data failed DataCRC and ERL>=1,
1357                  * silently drop this PDU and let the initiator
1358                  * plug the CmdSN gap.
1359                  *
1360                  * FIXME: Send Unsolicited NOPIN with reserved
1361                  * TTT here to help the initiator figure out
1362                  * the missing CmdSN, although they should be
1363                  * intelligent enough to determine the missing
1364                  * CmdSN and issue a retry to plug the sequence.
1365                  */
1366                 cmd->i_state = ISTATE_REMOVE;
1367                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1368         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1369                 return -1;
1370
1371         return 0;
1372 }
1373
1374 static int
1375 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1376                            unsigned char *buf)
1377 {
1378         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1379         int rc, immed_data;
1380         bool dump_payload = false;
1381
1382         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1383         if (rc < 0)
1384                 return 0;
1385         /*
1386          * Allocation iovecs needed for struct socket operations for
1387          * traditional iSCSI block I/O.
1388          */
1389         if (iscsit_allocate_iovecs(cmd) < 0) {
1390                 return iscsit_reject_cmd(cmd,
1391                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1392         }
1393         immed_data = cmd->immediate_data;
1394
1395         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1396         if (rc < 0)
1397                 return rc;
1398         else if (rc > 0)
1399                 dump_payload = true;
1400
1401         if (!immed_data)
1402                 return 0;
1403
1404         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1405 }
1406
1407 static u32 iscsit_do_crypto_hash_sg(
1408         struct ahash_request *hash,
1409         struct iscsit_cmd *cmd,
1410         u32 data_offset,
1411         u32 data_length,
1412         u32 padding,
1413         u8 *pad_bytes)
1414 {
1415         u32 data_crc;
1416         struct scatterlist *sg;
1417         unsigned int page_off;
1418
1419         crypto_ahash_init(hash);
1420
1421         sg = cmd->first_data_sg;
1422         page_off = cmd->first_data_sg_off;
1423
1424         if (data_length && page_off) {
1425                 struct scatterlist first_sg;
1426                 u32 len = min_t(u32, data_length, sg->length - page_off);
1427
1428                 sg_init_table(&first_sg, 1);
1429                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1430
1431                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1432                 crypto_ahash_update(hash);
1433
1434                 data_length -= len;
1435                 sg = sg_next(sg);
1436         }
1437
1438         while (data_length) {
1439                 u32 cur_len = min_t(u32, data_length, sg->length);
1440
1441                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1442                 crypto_ahash_update(hash);
1443
1444                 data_length -= cur_len;
1445                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1446                 sg = sg_next(sg);
1447         }
1448
1449         if (padding) {
1450                 struct scatterlist pad_sg;
1451
1452                 sg_init_one(&pad_sg, pad_bytes, padding);
1453                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1454                                         padding);
1455                 crypto_ahash_finup(hash);
1456         } else {
1457                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1458                 crypto_ahash_final(hash);
1459         }
1460
1461         return data_crc;
1462 }
1463
1464 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1465         const void *buf, u32 payload_length, u32 padding,
1466         const void *pad_bytes, void *data_crc)
1467 {
1468         struct scatterlist sg[2];
1469
1470         sg_init_table(sg, ARRAY_SIZE(sg));
1471         sg_set_buf(sg, buf, payload_length);
1472         if (padding)
1473                 sg_set_buf(sg + 1, pad_bytes, padding);
1474
1475         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1476
1477         crypto_ahash_digest(hash);
1478 }
1479
1480 int
1481 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1482                            struct iscsit_cmd *cmd, u32 payload_length,
1483                            bool *success)
1484 {
1485         struct iscsi_data *hdr = buf;
1486         struct se_cmd *se_cmd;
1487         int rc;
1488
1489         /* iSCSI write */
1490         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1491
1492         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1493                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1494                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1495                 payload_length, conn->cid);
1496
1497         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1498                 pr_err("Command ITT: 0x%08x received DataOUT after"
1499                         " last DataOUT received, dumping payload\n",
1500                         cmd->init_task_tag);
1501                 return iscsit_dump_data_payload(conn, payload_length, 1);
1502         }
1503
1504         if (cmd->data_direction != DMA_TO_DEVICE) {
1505                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1506                         " NON-WRITE command.\n", cmd->init_task_tag);
1507                 return iscsit_dump_data_payload(conn, payload_length, 1);
1508         }
1509         se_cmd = &cmd->se_cmd;
1510         iscsit_mod_dataout_timer(cmd);
1511
1512         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1513                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1514                        be32_to_cpu(hdr->offset), payload_length,
1515                        cmd->se_cmd.data_length);
1516                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1517         }
1518
1519         if (cmd->unsolicited_data) {
1520                 int dump_unsolicited_data = 0;
1521
1522                 if (conn->sess->sess_ops->InitialR2T) {
1523                         pr_err("Received unexpected unsolicited data"
1524                                 " while InitialR2T=Yes, protocol error.\n");
1525                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1526                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1527                         return -1;
1528                 }
1529                 /*
1530                  * Special case for dealing with Unsolicited DataOUT
1531                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1532                  * failures;
1533                  */
1534
1535                 /* Something's amiss if we're not in WRITE_PENDING state... */
1536                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1537                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1538                         dump_unsolicited_data = 1;
1539
1540                 if (dump_unsolicited_data) {
1541                         /*
1542                          * Check if a delayed TASK_ABORTED status needs to
1543                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1544                          * received with the unsolicited data out.
1545                          */
1546                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1547                                 iscsit_stop_dataout_timer(cmd);
1548
1549                         return iscsit_dump_data_payload(conn, payload_length, 1);
1550                 }
1551         } else {
1552                 /*
1553                  * For the normal solicited data path:
1554                  *
1555                  * Check for a delayed TASK_ABORTED status and dump any
1556                  * incoming data out payload if one exists.  Also, when the
1557                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1558                  * data out sequence, we decrement outstanding_r2ts.  Once
1559                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1560                  * TASK_ABORTED status.
1561                  */
1562                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1563                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1564                             --cmd->outstanding_r2ts < 1)
1565                                 iscsit_stop_dataout_timer(cmd);
1566
1567                         return iscsit_dump_data_payload(conn, payload_length, 1);
1568                 }
1569         }
1570         /*
1571          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1572          * within-command recovery checks before receiving the payload.
1573          */
1574         rc = iscsit_check_pre_dataout(cmd, buf);
1575         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1576                 return 0;
1577         else if (rc == DATAOUT_CANNOT_RECOVER)
1578                 return -1;
1579         *success = true;
1580         return 0;
1581 }
1582 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1583
1584 int
1585 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1586                          struct iscsit_cmd **out_cmd)
1587 {
1588         struct iscsi_data *hdr = buf;
1589         struct iscsit_cmd *cmd;
1590         u32 payload_length = ntoh24(hdr->dlength);
1591         int rc;
1592         bool success = false;
1593
1594         if (!payload_length) {
1595                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1596                 return 0;
1597         }
1598
1599         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1600                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1601                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1602                         conn->conn_ops->MaxXmitDataSegmentLength);
1603                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1604         }
1605
1606         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1607         if (!cmd)
1608                 return 0;
1609
1610         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1611
1612         if (success)
1613                 *out_cmd = cmd;
1614
1615         return rc;
1616 }
1617 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1618
1619 static int
1620 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1621                    struct iscsi_data *hdr)
1622 {
1623         struct kvec *iov;
1624         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1625         u32 payload_length;
1626         int iov_ret, data_crc_failed = 0;
1627
1628         payload_length = min_t(u32, cmd->se_cmd.data_length,
1629                                ntoh24(hdr->dlength));
1630         rx_size += payload_length;
1631         iov = &cmd->iov_data[0];
1632
1633         iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1634                                    be32_to_cpu(hdr->offset), payload_length);
1635         if (iov_ret < 0)
1636                 return -1;
1637
1638         iov_count += iov_ret;
1639
1640         padding = ((-payload_length) & 3);
1641         if (padding != 0) {
1642                 iov[iov_count].iov_base = cmd->pad_bytes;
1643                 iov[iov_count++].iov_len = padding;
1644                 rx_size += padding;
1645                 pr_debug("Receiving %u padding bytes.\n", padding);
1646         }
1647
1648         if (conn->conn_ops->DataDigest) {
1649                 iov[iov_count].iov_base = &checksum;
1650                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1651                 rx_size += ISCSI_CRC_LEN;
1652         }
1653
1654         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1655         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1656
1657         iscsit_unmap_iovec(cmd);
1658
1659         if (rx_got != rx_size)
1660                 return -1;
1661
1662         if (conn->conn_ops->DataDigest) {
1663                 u32 data_crc;
1664
1665                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1666                                                     be32_to_cpu(hdr->offset),
1667                                                     payload_length, padding,
1668                                                     cmd->pad_bytes);
1669
1670                 if (checksum != data_crc) {
1671                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1672                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1673                                 " does not match computed 0x%08x\n",
1674                                 hdr->itt, hdr->offset, payload_length,
1675                                 hdr->datasn, checksum, data_crc);
1676                         data_crc_failed = 1;
1677                 } else {
1678                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1679                                 " %u bytes of Data Out\n", checksum,
1680                                 payload_length);
1681                 }
1682         }
1683
1684         return data_crc_failed;
1685 }
1686
1687 int
1688 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1689                              bool data_crc_failed)
1690 {
1691         struct iscsit_conn *conn = cmd->conn;
1692         int rc, ooo_cmdsn;
1693         /*
1694          * Increment post receive data and CRC values or perform
1695          * within-command recovery.
1696          */
1697         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1698         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1699                 return 0;
1700         else if (rc == DATAOUT_SEND_R2T) {
1701                 iscsit_set_dataout_sequence_values(cmd);
1702                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1703         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1704                 /*
1705                  * Handle extra special case for out of order
1706                  * Unsolicited Data Out.
1707                  */
1708                 spin_lock_bh(&cmd->istate_lock);
1709                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1710                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1711                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1712                 spin_unlock_bh(&cmd->istate_lock);
1713
1714                 iscsit_stop_dataout_timer(cmd);
1715                 if (ooo_cmdsn)
1716                         return 0;
1717                 target_execute_cmd(&cmd->se_cmd);
1718                 return 0;
1719         } else /* DATAOUT_CANNOT_RECOVER */
1720                 return -1;
1721
1722         return 0;
1723 }
1724 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1725
1726 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1727 {
1728         struct iscsit_cmd *cmd = NULL;
1729         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1730         int rc;
1731         bool data_crc_failed = false;
1732
1733         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1734         if (rc < 0)
1735                 return 0;
1736         else if (!cmd)
1737                 return 0;
1738
1739         rc = iscsit_get_dataout(conn, cmd, hdr);
1740         if (rc < 0)
1741                 return rc;
1742         else if (rc > 0)
1743                 data_crc_failed = true;
1744
1745         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1746 }
1747
1748 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1749                          struct iscsi_nopout *hdr)
1750 {
1751         u32 payload_length = ntoh24(hdr->dlength);
1752
1753         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1754                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1755                 if (!cmd)
1756                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1757                                                  (unsigned char *)hdr);
1758
1759                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1760                                          (unsigned char *)hdr);
1761         }
1762
1763         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1764                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1765                         " not set, protocol error.\n");
1766                 if (!cmd)
1767                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1768                                                  (unsigned char *)hdr);
1769
1770                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1771                                          (unsigned char *)hdr);
1772         }
1773
1774         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1775                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1776                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1777                         " error.\n", payload_length,
1778                         conn->conn_ops->MaxXmitDataSegmentLength);
1779                 if (!cmd)
1780                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1781                                                  (unsigned char *)hdr);
1782
1783                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1784                                          (unsigned char *)hdr);
1785         }
1786
1787         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1788                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1789                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1790                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1791                 payload_length);
1792         /*
1793          * This is not a response to a Unsolicited NopIN, which means
1794          * it can either be a NOPOUT ping request (with a valid ITT),
1795          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1796          * Either way, make sure we allocate an struct iscsit_cmd, as both
1797          * can contain ping data.
1798          */
1799         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1800                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1801                 cmd->i_state            = ISTATE_SEND_NOPIN;
1802                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1803                                                 1 : 0);
1804                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1805                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1806                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1807                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1808                 cmd->data_direction     = DMA_NONE;
1809         }
1810
1811         return 0;
1812 }
1813 EXPORT_SYMBOL(iscsit_setup_nop_out);
1814
1815 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1816                            struct iscsi_nopout *hdr)
1817 {
1818         struct iscsit_cmd *cmd_p = NULL;
1819         int cmdsn_ret = 0;
1820         /*
1821          * Initiator is expecting a NopIN ping reply..
1822          */
1823         if (hdr->itt != RESERVED_ITT) {
1824                 if (!cmd)
1825                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1826                                                 (unsigned char *)hdr);
1827
1828                 spin_lock_bh(&conn->cmd_lock);
1829                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1830                 spin_unlock_bh(&conn->cmd_lock);
1831
1832                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1833
1834                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1835                         iscsit_add_cmd_to_response_queue(cmd, conn,
1836                                                          cmd->i_state);
1837                         return 0;
1838                 }
1839
1840                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1841                                 (unsigned char *)hdr, hdr->cmdsn);
1842                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1843                         return 0;
1844                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1845                         return -1;
1846
1847                 return 0;
1848         }
1849         /*
1850          * This was a response to a unsolicited NOPIN ping.
1851          */
1852         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1853                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1854                 if (!cmd_p)
1855                         return -EINVAL;
1856
1857                 iscsit_stop_nopin_response_timer(conn);
1858
1859                 cmd_p->i_state = ISTATE_REMOVE;
1860                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1861
1862                 iscsit_start_nopin_timer(conn);
1863                 return 0;
1864         }
1865         /*
1866          * Otherwise, initiator is not expecting a NOPIN is response.
1867          * Just ignore for now.
1868          */
1869
1870         if (cmd)
1871                 iscsit_free_cmd(cmd, false);
1872
1873         return 0;
1874 }
1875 EXPORT_SYMBOL(iscsit_process_nop_out);
1876
1877 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1878                                  unsigned char *buf)
1879 {
1880         unsigned char *ping_data = NULL;
1881         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1882         struct kvec *iov = NULL;
1883         u32 payload_length = ntoh24(hdr->dlength);
1884         int ret;
1885
1886         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1887         if (ret < 0)
1888                 return 0;
1889         /*
1890          * Handle NOP-OUT payload for traditional iSCSI sockets
1891          */
1892         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1893                 u32 checksum, data_crc, padding = 0;
1894                 int niov = 0, rx_got, rx_size = payload_length;
1895
1896                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1897                 if (!ping_data) {
1898                         ret = -1;
1899                         goto out;
1900                 }
1901
1902                 iov = &cmd->iov_misc[0];
1903                 iov[niov].iov_base      = ping_data;
1904                 iov[niov++].iov_len     = payload_length;
1905
1906                 padding = ((-payload_length) & 3);
1907                 if (padding != 0) {
1908                         pr_debug("Receiving %u additional bytes"
1909                                 " for padding.\n", padding);
1910                         iov[niov].iov_base      = &cmd->pad_bytes;
1911                         iov[niov++].iov_len     = padding;
1912                         rx_size += padding;
1913                 }
1914                 if (conn->conn_ops->DataDigest) {
1915                         iov[niov].iov_base      = &checksum;
1916                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1917                         rx_size += ISCSI_CRC_LEN;
1918                 }
1919
1920                 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1921                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1922                 if (rx_got != rx_size) {
1923                         ret = -1;
1924                         goto out;
1925                 }
1926
1927                 if (conn->conn_ops->DataDigest) {
1928                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1929                                                   payload_length, padding,
1930                                                   cmd->pad_bytes, &data_crc);
1931
1932                         if (checksum != data_crc) {
1933                                 pr_err("Ping data CRC32C DataDigest"
1934                                 " 0x%08x does not match computed 0x%08x\n",
1935                                         checksum, data_crc);
1936                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1937                                         pr_err("Unable to recover from"
1938                                         " NOPOUT Ping DataCRC failure while in"
1939                                                 " ERL=0.\n");
1940                                         ret = -1;
1941                                         goto out;
1942                                 } else {
1943                                         /*
1944                                          * Silently drop this PDU and let the
1945                                          * initiator plug the CmdSN gap.
1946                                          */
1947                                         pr_debug("Dropping NOPOUT"
1948                                         " Command CmdSN: 0x%08x due to"
1949                                         " DataCRC error.\n", hdr->cmdsn);
1950                                         ret = 0;
1951                                         goto out;
1952                                 }
1953                         } else {
1954                                 pr_debug("Got CRC32C DataDigest"
1955                                 " 0x%08x for %u bytes of ping data.\n",
1956                                         checksum, payload_length);
1957                         }
1958                 }
1959
1960                 ping_data[payload_length] = '\0';
1961                 /*
1962                  * Attach ping data to struct iscsit_cmd->buf_ptr.
1963                  */
1964                 cmd->buf_ptr = ping_data;
1965                 cmd->buf_ptr_size = payload_length;
1966
1967                 pr_debug("Got %u bytes of NOPOUT ping"
1968                         " data.\n", payload_length);
1969                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1970         }
1971
1972         return iscsit_process_nop_out(conn, cmd, hdr);
1973 out:
1974         if (cmd)
1975                 iscsit_free_cmd(cmd, false);
1976
1977         kfree(ping_data);
1978         return ret;
1979 }
1980
1981 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1982 {
1983         switch (iscsi_tmf) {
1984         case ISCSI_TM_FUNC_ABORT_TASK:
1985                 return TMR_ABORT_TASK;
1986         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1987                 return TMR_ABORT_TASK_SET;
1988         case ISCSI_TM_FUNC_CLEAR_ACA:
1989                 return TMR_CLEAR_ACA;
1990         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1991                 return TMR_CLEAR_TASK_SET;
1992         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1993                 return TMR_LUN_RESET;
1994         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1995                 return TMR_TARGET_WARM_RESET;
1996         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1997                 return TMR_TARGET_COLD_RESET;
1998         default:
1999                 return TMR_UNKNOWN;
2000         }
2001 }
2002
2003 int
2004 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2005                            unsigned char *buf)
2006 {
2007         struct se_tmr_req *se_tmr;
2008         struct iscsi_tmr_req *tmr_req;
2009         struct iscsi_tm *hdr;
2010         int out_of_order_cmdsn = 0, ret;
2011         u8 function, tcm_function = TMR_UNKNOWN;
2012
2013         hdr                     = (struct iscsi_tm *) buf;
2014         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2015         function = hdr->flags;
2016
2017         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
2018                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
2019                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
2020                 hdr->rtt, hdr->refcmdsn, conn->cid);
2021
2022         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2023             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2024              hdr->rtt != RESERVED_ITT)) {
2025                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
2026                 hdr->rtt = RESERVED_ITT;
2027         }
2028
2029         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
2030                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2031                 pr_err("Task Management Request TASK_REASSIGN not"
2032                         " issued as immediate command, bad iSCSI Initiator"
2033                                 "implementation\n");
2034                 return iscsit_add_reject_cmd(cmd,
2035                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
2036         }
2037         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2038             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2039                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2040
2041         cmd->data_direction = DMA_NONE;
2042         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2043         if (!cmd->tmr_req) {
2044                 return iscsit_add_reject_cmd(cmd,
2045                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2046                                              buf);
2047         }
2048
2049         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2050                           conn->sess->se_sess, 0, DMA_NONE,
2051                           TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2052                           scsilun_to_int(&hdr->lun),
2053                           conn->cmd_cnt);
2054
2055         target_get_sess_cmd(&cmd->se_cmd, true);
2056
2057         /*
2058          * TASK_REASSIGN for ERL=2 / connection stays inside of
2059          * LIO-Target $FABRIC_MOD
2060          */
2061         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2062                 tcm_function = iscsit_convert_tmf(function);
2063                 if (tcm_function == TMR_UNKNOWN) {
2064                         pr_err("Unknown iSCSI TMR Function:"
2065                                " 0x%02x\n", function);
2066                         return iscsit_add_reject_cmd(cmd,
2067                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2068                 }
2069         }
2070         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2071                                  GFP_KERNEL);
2072         if (ret < 0)
2073                 return iscsit_add_reject_cmd(cmd,
2074                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2075
2076         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2077
2078         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2079         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2080         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2081         cmd->init_task_tag      = hdr->itt;
2082         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2083         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2084         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2085         se_tmr                  = cmd->se_cmd.se_tmr_req;
2086         tmr_req                 = cmd->tmr_req;
2087         /*
2088          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2089          */
2090         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2091                 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2092                 if (ret < 0) {
2093                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2094                         goto attach;
2095                 }
2096         }
2097
2098         switch (function) {
2099         case ISCSI_TM_FUNC_ABORT_TASK:
2100                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2101                 if (se_tmr->response)
2102                         goto attach;
2103                 break;
2104         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2105         case ISCSI_TM_FUNC_CLEAR_ACA:
2106         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2107         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2108                 break;
2109         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2110                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2111                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2112                         goto attach;
2113                 }
2114                 break;
2115         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2116                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2117                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2118                         goto attach;
2119                 }
2120                 break;
2121         case ISCSI_TM_FUNC_TASK_REASSIGN:
2122                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2123                 /*
2124                  * Perform sanity checks on the ExpDataSN only if the
2125                  * TASK_REASSIGN was successful.
2126                  */
2127                 if (se_tmr->response)
2128                         break;
2129
2130                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2131                         return iscsit_add_reject_cmd(cmd,
2132                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2133                 break;
2134         default:
2135                 pr_err("Unknown TMR function: 0x%02x, protocol"
2136                         " error.\n", function);
2137                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2138                 goto attach;
2139         }
2140
2141         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2142             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2143                 se_tmr->call_transport = 1;
2144 attach:
2145         spin_lock_bh(&conn->cmd_lock);
2146         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2147         spin_unlock_bh(&conn->cmd_lock);
2148
2149         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2150                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2151                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2152                         out_of_order_cmdsn = 1;
2153                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2154                         target_put_sess_cmd(&cmd->se_cmd);
2155                         return 0;
2156                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2157                         return -1;
2158                 }
2159         }
2160         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2161
2162         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2163                 return 0;
2164         /*
2165          * Found the referenced task, send to transport for processing.
2166          */
2167         if (se_tmr->call_transport)
2168                 return transport_generic_handle_tmr(&cmd->se_cmd);
2169
2170         /*
2171          * Could not find the referenced LUN, task, or Task Management
2172          * command not authorized or supported.  Change state and
2173          * let the tx_thread send the response.
2174          *
2175          * For connection recovery, this is also the default action for
2176          * TMR TASK_REASSIGN.
2177          */
2178         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2179         target_put_sess_cmd(&cmd->se_cmd);
2180         return 0;
2181 }
2182 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2183
2184 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2185 int
2186 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2187                       struct iscsi_text *hdr)
2188 {
2189         u32 payload_length = ntoh24(hdr->dlength);
2190
2191         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2192                 pr_err("Unable to accept text parameter length: %u"
2193                         "greater than MaxXmitDataSegmentLength %u.\n",
2194                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2195                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2196                                          (unsigned char *)hdr);
2197         }
2198
2199         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2200              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2201                 pr_err("Multi sequence text commands currently not supported\n");
2202                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2203                                         (unsigned char *)hdr);
2204         }
2205
2206         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2207                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2208                 hdr->exp_statsn, payload_length);
2209
2210         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2211         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2212         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2213         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2214         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2215         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2216         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2217         cmd->data_direction     = DMA_NONE;
2218         kfree(cmd->text_in_ptr);
2219         cmd->text_in_ptr        = NULL;
2220
2221         return 0;
2222 }
2223 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2224
2225 int
2226 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2227                         struct iscsi_text *hdr)
2228 {
2229         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2230         int cmdsn_ret;
2231
2232         if (!text_in) {
2233                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2234                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2235                         pr_err("Unable to locate text_in buffer for sendtargets"
2236                                " discovery\n");
2237                         goto reject;
2238                 }
2239                 goto empty_sendtargets;
2240         }
2241         if (strncmp("SendTargets=", text_in, 12) != 0) {
2242                 pr_err("Received Text Data that is not"
2243                         " SendTargets, cannot continue.\n");
2244                 goto reject;
2245         }
2246         /* '=' confirmed in strncmp */
2247         text_ptr = strchr(text_in, '=');
2248         BUG_ON(!text_ptr);
2249         if (!strncmp("=All", text_ptr, 5)) {
2250                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2251         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2252                    !strncmp("=eui.", text_ptr, 5)) {
2253                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2254         } else {
2255                 pr_err("Unable to locate valid SendTargets%s value\n",
2256                        text_ptr);
2257                 goto reject;
2258         }
2259
2260         spin_lock_bh(&conn->cmd_lock);
2261         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2262         spin_unlock_bh(&conn->cmd_lock);
2263
2264 empty_sendtargets:
2265         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2266
2267         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2268                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2269                                 (unsigned char *)hdr, hdr->cmdsn);
2270                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2271                         return -1;
2272
2273                 return 0;
2274         }
2275
2276         return iscsit_execute_cmd(cmd, 0);
2277
2278 reject:
2279         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2280                                  (unsigned char *)hdr);
2281 }
2282 EXPORT_SYMBOL(iscsit_process_text_cmd);
2283
2284 static int
2285 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2286                        unsigned char *buf)
2287 {
2288         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2289         char *text_in = NULL;
2290         u32 payload_length = ntoh24(hdr->dlength);
2291         int rx_size, rc;
2292
2293         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2294         if (rc < 0)
2295                 return 0;
2296
2297         rx_size = payload_length;
2298         if (payload_length) {
2299                 u32 checksum = 0, data_crc = 0;
2300                 u32 padding = 0;
2301                 int niov = 0, rx_got;
2302                 struct kvec iov[2];
2303
2304                 rx_size = ALIGN(payload_length, 4);
2305                 text_in = kzalloc(rx_size, GFP_KERNEL);
2306                 if (!text_in)
2307                         goto reject;
2308
2309                 cmd->text_in_ptr = text_in;
2310
2311                 memset(iov, 0, sizeof(iov));
2312                 iov[niov].iov_base      = text_in;
2313                 iov[niov++].iov_len     = rx_size;
2314
2315                 padding = rx_size - payload_length;
2316                 if (padding)
2317                         pr_debug("Receiving %u additional bytes"
2318                                         " for padding.\n", padding);
2319                 if (conn->conn_ops->DataDigest) {
2320                         iov[niov].iov_base      = &checksum;
2321                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2322                         rx_size += ISCSI_CRC_LEN;
2323                 }
2324
2325                 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2326                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2327                 if (rx_got != rx_size)
2328                         goto reject;
2329
2330                 if (conn->conn_ops->DataDigest) {
2331                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2332                                                   text_in, rx_size, 0, NULL,
2333                                                   &data_crc);
2334
2335                         if (checksum != data_crc) {
2336                                 pr_err("Text data CRC32C DataDigest"
2337                                         " 0x%08x does not match computed"
2338                                         " 0x%08x\n", checksum, data_crc);
2339                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2340                                         pr_err("Unable to recover from"
2341                                         " Text Data digest failure while in"
2342                                                 " ERL=0.\n");
2343                                         goto reject;
2344                                 } else {
2345                                         /*
2346                                          * Silently drop this PDU and let the
2347                                          * initiator plug the CmdSN gap.
2348                                          */
2349                                         pr_debug("Dropping Text"
2350                                         " Command CmdSN: 0x%08x due to"
2351                                         " DataCRC error.\n", hdr->cmdsn);
2352                                         kfree(text_in);
2353                                         return 0;
2354                                 }
2355                         } else {
2356                                 pr_debug("Got CRC32C DataDigest"
2357                                         " 0x%08x for %u bytes of text data.\n",
2358                                                 checksum, payload_length);
2359                         }
2360                 }
2361                 text_in[payload_length - 1] = '\0';
2362                 pr_debug("Successfully read %d bytes of text"
2363                                 " data.\n", payload_length);
2364         }
2365
2366         return iscsit_process_text_cmd(conn, cmd, hdr);
2367
2368 reject:
2369         kfree(cmd->text_in_ptr);
2370         cmd->text_in_ptr = NULL;
2371         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2372 }
2373
2374 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2375 {
2376         struct iscsit_conn *conn_p;
2377         struct iscsit_session *sess = conn->sess;
2378
2379         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2380                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2381
2382         atomic_set(&sess->session_logout, 1);
2383         atomic_set(&conn->conn_logout_remove, 1);
2384         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2385
2386         iscsit_inc_conn_usage_count(conn);
2387         iscsit_inc_session_usage_count(sess);
2388
2389         spin_lock_bh(&sess->conn_lock);
2390         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2391                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2392                         continue;
2393
2394                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2395                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2396         }
2397         spin_unlock_bh(&sess->conn_lock);
2398
2399         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2400
2401         return 0;
2402 }
2403
2404 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2405 {
2406         struct iscsit_conn *l_conn;
2407         struct iscsit_session *sess = conn->sess;
2408
2409         pr_debug("Received logout request CLOSECONNECTION for CID:"
2410                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2411
2412         /*
2413          * A Logout Request with a CLOSECONNECTION reason code for a CID
2414          * can arrive on a connection with a differing CID.
2415          */
2416         if (conn->cid == cmd->logout_cid) {
2417                 spin_lock_bh(&conn->state_lock);
2418                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2419                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2420
2421                 atomic_set(&conn->conn_logout_remove, 1);
2422                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2423                 iscsit_inc_conn_usage_count(conn);
2424
2425                 spin_unlock_bh(&conn->state_lock);
2426         } else {
2427                 /*
2428                  * Handle all different cid CLOSECONNECTION requests in
2429                  * iscsit_logout_post_handler_diffcid() as to give enough
2430                  * time for any non immediate command's CmdSN to be
2431                  * acknowledged on the connection in question.
2432                  *
2433                  * Here we simply make sure the CID is still around.
2434                  */
2435                 l_conn = iscsit_get_conn_from_cid(sess,
2436                                 cmd->logout_cid);
2437                 if (!l_conn) {
2438                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2439                         iscsit_add_cmd_to_response_queue(cmd, conn,
2440                                         cmd->i_state);
2441                         return 0;
2442                 }
2443
2444                 iscsit_dec_conn_usage_count(l_conn);
2445         }
2446
2447         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2448
2449         return 0;
2450 }
2451
2452 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2453 {
2454         struct iscsit_session *sess = conn->sess;
2455
2456         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2457                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2458
2459         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2460                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2461                         " while ERL!=2.\n");
2462                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2463                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2464                 return 0;
2465         }
2466
2467         if (conn->cid == cmd->logout_cid) {
2468                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2469                         " with CID: %hu on CID: %hu, implementation error.\n",
2470                                 cmd->logout_cid, conn->cid);
2471                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2472                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2473                 return 0;
2474         }
2475
2476         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2477
2478         return 0;
2479 }
2480
2481 int
2482 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2483                         unsigned char *buf)
2484 {
2485         int cmdsn_ret, logout_remove = 0;
2486         u8 reason_code = 0;
2487         struct iscsi_logout *hdr;
2488         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2489
2490         hdr                     = (struct iscsi_logout *) buf;
2491         reason_code             = (hdr->flags & 0x7f);
2492
2493         if (tiqn) {
2494                 spin_lock(&tiqn->logout_stats.lock);
2495                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2496                         tiqn->logout_stats.normal_logouts++;
2497                 else
2498                         tiqn->logout_stats.abnormal_logouts++;
2499                 spin_unlock(&tiqn->logout_stats.lock);
2500         }
2501
2502         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2503                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2504                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2505                 hdr->cid, conn->cid);
2506
2507         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2508                 pr_err("Received logout request on connection that"
2509                         " is not in logged in state, ignoring request.\n");
2510                 iscsit_free_cmd(cmd, false);
2511                 return 0;
2512         }
2513
2514         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2515         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2516         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2517         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2518         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2519         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2520         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2521         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2522         cmd->logout_reason      = reason_code;
2523         cmd->data_direction     = DMA_NONE;
2524
2525         /*
2526          * We need to sleep in these cases (by returning 1) until the Logout
2527          * Response gets sent in the tx thread.
2528          */
2529         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2530            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2531             be16_to_cpu(hdr->cid) == conn->cid))
2532                 logout_remove = 1;
2533
2534         spin_lock_bh(&conn->cmd_lock);
2535         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2536         spin_unlock_bh(&conn->cmd_lock);
2537
2538         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2539                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2540
2541         /*
2542          * Immediate commands are executed, well, immediately.
2543          * Non-Immediate Logout Commands are executed in CmdSN order.
2544          */
2545         if (cmd->immediate_cmd) {
2546                 int ret = iscsit_execute_cmd(cmd, 0);
2547
2548                 if (ret < 0)
2549                         return ret;
2550         } else {
2551                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2552                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2553                         logout_remove = 0;
2554                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2555                         return -1;
2556         }
2557
2558         return logout_remove;
2559 }
2560 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2561
2562 int iscsit_handle_snack(
2563         struct iscsit_conn *conn,
2564         unsigned char *buf)
2565 {
2566         struct iscsi_snack *hdr;
2567
2568         hdr                     = (struct iscsi_snack *) buf;
2569         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2570
2571         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2572                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2573                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2574                         hdr->begrun, hdr->runlength, conn->cid);
2575
2576         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2577                 pr_err("Initiator sent SNACK request while in"
2578                         " ErrorRecoveryLevel=0.\n");
2579                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2580                                          buf);
2581         }
2582         /*
2583          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2584          * call from inside iscsi_send_recovery_datain_or_r2t().
2585          */
2586         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2587         case 0:
2588                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2589                         hdr->itt,
2590                         be32_to_cpu(hdr->ttt),
2591                         be32_to_cpu(hdr->begrun),
2592                         be32_to_cpu(hdr->runlength));
2593         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2594                 return iscsit_handle_status_snack(conn, hdr->itt,
2595                         be32_to_cpu(hdr->ttt),
2596                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2597         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2598                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2599                         be32_to_cpu(hdr->begrun),
2600                         be32_to_cpu(hdr->runlength));
2601         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2602                 /* FIXME: Support R-Data SNACK */
2603                 pr_err("R-Data SNACK Not Supported.\n");
2604                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2605                                          buf);
2606         default:
2607                 pr_err("Unknown SNACK type 0x%02x, protocol"
2608                         " error.\n", hdr->flags & 0x0f);
2609                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2610                                          buf);
2611         }
2612
2613         return 0;
2614 }
2615 EXPORT_SYMBOL(iscsit_handle_snack);
2616
2617 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2618 {
2619         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2620             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2621                 wait_for_completion_interruptible_timeout(
2622                                         &conn->rx_half_close_comp,
2623                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2624         }
2625 }
2626
2627 static int iscsit_handle_immediate_data(
2628         struct iscsit_cmd *cmd,
2629         struct iscsi_scsi_req *hdr,
2630         u32 length)
2631 {
2632         int iov_ret, rx_got = 0, rx_size = 0;
2633         u32 checksum, iov_count = 0, padding = 0;
2634         struct iscsit_conn *conn = cmd->conn;
2635         struct kvec *iov;
2636         void *overflow_buf = NULL;
2637
2638         BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2639         rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2640         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2641                                    cmd->orig_iov_data_count - 2,
2642                                    cmd->write_data_done, rx_size);
2643         if (iov_ret < 0)
2644                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2645
2646         iov_count = iov_ret;
2647         iov = &cmd->iov_data[0];
2648         if (rx_size < length) {
2649                 /*
2650                  * Special case: length of immediate data exceeds the data
2651                  * buffer size derived from the CDB.
2652                  */
2653                 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2654                 if (!overflow_buf) {
2655                         iscsit_unmap_iovec(cmd);
2656                         return IMMEDIATE_DATA_CANNOT_RECOVER;
2657                 }
2658                 cmd->overflow_buf = overflow_buf;
2659                 iov[iov_count].iov_base = overflow_buf;
2660                 iov[iov_count].iov_len = length - rx_size;
2661                 iov_count++;
2662                 rx_size = length;
2663         }
2664
2665         padding = ((-length) & 3);
2666         if (padding != 0) {
2667                 iov[iov_count].iov_base = cmd->pad_bytes;
2668                 iov[iov_count++].iov_len = padding;
2669                 rx_size += padding;
2670         }
2671
2672         if (conn->conn_ops->DataDigest) {
2673                 iov[iov_count].iov_base         = &checksum;
2674                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2675                 rx_size += ISCSI_CRC_LEN;
2676         }
2677
2678         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2679         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2680
2681         iscsit_unmap_iovec(cmd);
2682
2683         if (rx_got != rx_size) {
2684                 iscsit_rx_thread_wait_for_tcp(conn);
2685                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2686         }
2687
2688         if (conn->conn_ops->DataDigest) {
2689                 u32 data_crc;
2690
2691                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2692                                                     cmd->write_data_done, length, padding,
2693                                                     cmd->pad_bytes);
2694
2695                 if (checksum != data_crc) {
2696                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2697                                 " does not match computed 0x%08x\n", checksum,
2698                                 data_crc);
2699
2700                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2701                                 pr_err("Unable to recover from"
2702                                         " Immediate Data digest failure while"
2703                                         " in ERL=0.\n");
2704                                 iscsit_reject_cmd(cmd,
2705                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2706                                                 (unsigned char *)hdr);
2707                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2708                         } else {
2709                                 iscsit_reject_cmd(cmd,
2710                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2711                                                 (unsigned char *)hdr);
2712                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2713                         }
2714                 } else {
2715                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2716                                 " %u bytes of Immediate Data\n", checksum,
2717                                 length);
2718                 }
2719         }
2720
2721         cmd->write_data_done += length;
2722
2723         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2724                 spin_lock_bh(&cmd->istate_lock);
2725                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2726                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2727                 spin_unlock_bh(&cmd->istate_lock);
2728         }
2729
2730         return IMMEDIATE_DATA_NORMAL_OPERATION;
2731 }
2732
2733 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2734         with active network interface */
2735 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2736 {
2737         struct iscsit_cmd *cmd;
2738         struct iscsit_conn *conn_p;
2739         bool found = false;
2740
2741         lockdep_assert_held(&conn->sess->conn_lock);
2742
2743         /*
2744          * Only send a Asynchronous Message on connections whos network
2745          * interface is still functional.
2746          */
2747         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2748                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2749                         iscsit_inc_conn_usage_count(conn_p);
2750                         found = true;
2751                         break;
2752                 }
2753         }
2754
2755         if (!found)
2756                 return;
2757
2758         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2759         if (!cmd) {
2760                 iscsit_dec_conn_usage_count(conn_p);
2761                 return;
2762         }
2763
2764         cmd->logout_cid = conn->cid;
2765         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2766         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2767
2768         spin_lock_bh(&conn_p->cmd_lock);
2769         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2770         spin_unlock_bh(&conn_p->cmd_lock);
2771
2772         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2773         iscsit_dec_conn_usage_count(conn_p);
2774 }
2775
2776 static int iscsit_send_conn_drop_async_message(
2777         struct iscsit_cmd *cmd,
2778         struct iscsit_conn *conn)
2779 {
2780         struct iscsi_async *hdr;
2781
2782         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2783
2784         hdr                     = (struct iscsi_async *) cmd->pdu;
2785         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2786         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2787         cmd->init_task_tag      = RESERVED_ITT;
2788         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2789         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2790         cmd->stat_sn            = conn->stat_sn++;
2791         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2792         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2793         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2794         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2795         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2796         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2797         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2798
2799         pr_debug("Sending Connection Dropped Async Message StatSN:"
2800                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2801                         cmd->logout_cid, conn->cid);
2802
2803         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2804 }
2805
2806 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2807 {
2808         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2809             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2810                 wait_for_completion_interruptible_timeout(
2811                                         &conn->tx_half_close_comp,
2812                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2813         }
2814 }
2815
2816 void
2817 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2818                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2819                         bool set_statsn)
2820 {
2821         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2822         hdr->flags              = datain->flags;
2823         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2824                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2825                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2826                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2827                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2828                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2829                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2830                 }
2831         }
2832         hton24(hdr->dlength, datain->length);
2833         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2834                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2835                                 (struct scsi_lun *)&hdr->lun);
2836         else
2837                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2838
2839         hdr->itt                = cmd->init_task_tag;
2840
2841         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2842                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2843         else
2844                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2845         if (set_statsn)
2846                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2847         else
2848                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2849
2850         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2851         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2852         hdr->datasn             = cpu_to_be32(datain->data_sn);
2853         hdr->offset             = cpu_to_be32(datain->offset);
2854
2855         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2856                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2857                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2858                 ntohl(hdr->offset), datain->length, conn->cid);
2859 }
2860 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2861
2862 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2863 {
2864         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2865         struct iscsi_datain datain;
2866         struct iscsi_datain_req *dr;
2867         int eodr = 0, ret;
2868         bool set_statsn = false;
2869
2870         memset(&datain, 0, sizeof(struct iscsi_datain));
2871         dr = iscsit_get_datain_values(cmd, &datain);
2872         if (!dr) {
2873                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2874                                 cmd->init_task_tag);
2875                 return -1;
2876         }
2877         /*
2878          * Be paranoid and double check the logic for now.
2879          */
2880         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2881                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2882                         " datain.length: %u exceeds cmd->data_length: %u\n",
2883                         cmd->init_task_tag, datain.offset, datain.length,
2884                         cmd->se_cmd.data_length);
2885                 return -1;
2886         }
2887
2888         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2889         /*
2890          * Special case for successfully execution w/ both DATAIN
2891          * and Sense Data.
2892          */
2893         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2894             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2895                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2896         else {
2897                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2898                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2899                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2900                         cmd->stat_sn = conn->stat_sn++;
2901                         set_statsn = true;
2902                 } else if (dr->dr_complete ==
2903                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2904                         set_statsn = true;
2905         }
2906
2907         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2908
2909         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2910         if (ret < 0)
2911                 return ret;
2912
2913         if (dr->dr_complete) {
2914                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2915                                 2 : 1;
2916                 iscsit_free_datain_req(cmd, dr);
2917         }
2918
2919         return eodr;
2920 }
2921
2922 int
2923 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2924                         struct iscsi_logout_rsp *hdr)
2925 {
2926         struct iscsit_conn *logout_conn = NULL;
2927         struct iscsi_conn_recovery *cr = NULL;
2928         struct iscsit_session *sess = conn->sess;
2929         /*
2930          * The actual shutting down of Sessions and/or Connections
2931          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2932          * is done in scsi_logout_post_handler().
2933          */
2934         switch (cmd->logout_reason) {
2935         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2936                 pr_debug("iSCSI session logout successful, setting"
2937                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2938                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2939                 break;
2940         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2941                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2942                         break;
2943                 /*
2944                  * For CLOSECONNECTION logout requests carrying
2945                  * a matching logout CID -> local CID, the reference
2946                  * for the local CID will have been incremented in
2947                  * iscsi_logout_closeconnection().
2948                  *
2949                  * For CLOSECONNECTION logout requests carrying
2950                  * a different CID than the connection it arrived
2951                  * on, the connection responding to cmd->logout_cid
2952                  * is stopped in iscsit_logout_post_handler_diffcid().
2953                  */
2954
2955                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2956                         " successful.\n", cmd->logout_cid, conn->cid);
2957                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2958                 break;
2959         case ISCSI_LOGOUT_REASON_RECOVERY:
2960                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2961                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2962                         break;
2963                 /*
2964                  * If the connection is still active from our point of view
2965                  * force connection recovery to occur.
2966                  */
2967                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2968                                 cmd->logout_cid);
2969                 if (logout_conn) {
2970                         iscsit_connection_reinstatement_rcfr(logout_conn);
2971                         iscsit_dec_conn_usage_count(logout_conn);
2972                 }
2973
2974                 cr = iscsit_get_inactive_connection_recovery_entry(
2975                                 conn->sess, cmd->logout_cid);
2976                 if (!cr) {
2977                         pr_err("Unable to locate CID: %hu for"
2978                         " REMOVECONNFORRECOVERY Logout Request.\n",
2979                                 cmd->logout_cid);
2980                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2981                         break;
2982                 }
2983
2984                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2985
2986                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2987                         " for recovery for CID: %hu on CID: %hu successful.\n",
2988                                 cmd->logout_cid, conn->cid);
2989                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2990                 break;
2991         default:
2992                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2993                                 cmd->logout_reason);
2994                 return -1;
2995         }
2996
2997         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2998         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2999         hdr->response           = cmd->logout_response;
3000         hdr->itt                = cmd->init_task_tag;
3001         cmd->stat_sn            = conn->stat_sn++;
3002         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3003
3004         iscsit_increment_maxcmdsn(cmd, conn->sess);
3005         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3006         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3007
3008         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
3009                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
3010                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
3011                 cmd->logout_cid, conn->cid);
3012
3013         return 0;
3014 }
3015 EXPORT_SYMBOL(iscsit_build_logout_rsp);
3016
3017 static int
3018 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3019 {
3020         int rc;
3021
3022         rc = iscsit_build_logout_rsp(cmd, conn,
3023                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
3024         if (rc < 0)
3025                 return rc;
3026
3027         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3028 }
3029
3030 void
3031 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3032                        struct iscsi_nopin *hdr, bool nopout_response)
3033 {
3034         hdr->opcode             = ISCSI_OP_NOOP_IN;
3035         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3036         hton24(hdr->dlength, cmd->buf_ptr_size);
3037         if (nopout_response)
3038                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3039         hdr->itt                = cmd->init_task_tag;
3040         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3041         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
3042                                   conn->stat_sn;
3043         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3044
3045         if (nopout_response)
3046                 iscsit_increment_maxcmdsn(cmd, conn->sess);
3047
3048         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3049         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3050
3051         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3052                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3053                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3054                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3055 }
3056 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3057
3058 /*
3059  *      Unsolicited NOPIN, either requesting a response or not.
3060  */
3061 static int iscsit_send_unsolicited_nopin(
3062         struct iscsit_cmd *cmd,
3063         struct iscsit_conn *conn,
3064         int want_response)
3065 {
3066         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3067         int ret;
3068
3069         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3070
3071         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3072                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3073
3074         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3075         if (ret < 0)
3076                 return ret;
3077
3078         spin_lock_bh(&cmd->istate_lock);
3079         cmd->i_state = want_response ?
3080                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3081         spin_unlock_bh(&cmd->istate_lock);
3082
3083         return 0;
3084 }
3085
3086 static int
3087 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3088 {
3089         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3090
3091         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3092
3093         /*
3094          * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3095          * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3096          */
3097         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3098
3099         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3100                                                      cmd->buf_ptr,
3101                                                      cmd->buf_ptr_size);
3102 }
3103
3104 static int iscsit_send_r2t(
3105         struct iscsit_cmd *cmd,
3106         struct iscsit_conn *conn)
3107 {
3108         struct iscsi_r2t *r2t;
3109         struct iscsi_r2t_rsp *hdr;
3110         int ret;
3111
3112         r2t = iscsit_get_r2t_from_list(cmd);
3113         if (!r2t)
3114                 return -1;
3115
3116         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3117         memset(hdr, 0, ISCSI_HDR_LEN);
3118         hdr->opcode             = ISCSI_OP_R2T;
3119         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3120         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3121                         (struct scsi_lun *)&hdr->lun);
3122         hdr->itt                = cmd->init_task_tag;
3123         if (conn->conn_transport->iscsit_get_r2t_ttt)
3124                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3125         else
3126                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3127         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3128         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3129         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3130         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3131         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3132         hdr->data_offset        = cpu_to_be32(r2t->offset);
3133         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3134
3135         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3136                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3137                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3138                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3139                         r2t->offset, r2t->xfer_len, conn->cid);
3140
3141         spin_lock_bh(&cmd->r2t_lock);
3142         r2t->sent_r2t = 1;
3143         spin_unlock_bh(&cmd->r2t_lock);
3144
3145         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3146         if (ret < 0) {
3147                 return ret;
3148         }
3149
3150         spin_lock_bh(&cmd->dataout_timeout_lock);
3151         iscsit_start_dataout_timer(cmd, conn);
3152         spin_unlock_bh(&cmd->dataout_timeout_lock);
3153
3154         return 0;
3155 }
3156
3157 /*
3158  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3159  *              connection recovery.
3160  */
3161 int iscsit_build_r2ts_for_cmd(
3162         struct iscsit_conn *conn,
3163         struct iscsit_cmd *cmd,
3164         bool recovery)
3165 {
3166         int first_r2t = 1;
3167         u32 offset = 0, xfer_len = 0;
3168
3169         spin_lock_bh(&cmd->r2t_lock);
3170         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3171                 spin_unlock_bh(&cmd->r2t_lock);
3172                 return 0;
3173         }
3174
3175         if (conn->sess->sess_ops->DataSequenceInOrder &&
3176             !recovery)
3177                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3178
3179         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3180                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3181                         offset = cmd->r2t_offset;
3182
3183                         if (first_r2t && recovery) {
3184                                 int new_data_end = offset +
3185                                         conn->sess->sess_ops->MaxBurstLength -
3186                                         cmd->next_burst_len;
3187
3188                                 if (new_data_end > cmd->se_cmd.data_length)
3189                                         xfer_len = cmd->se_cmd.data_length - offset;
3190                                 else
3191                                         xfer_len =
3192                                                 conn->sess->sess_ops->MaxBurstLength -
3193                                                 cmd->next_burst_len;
3194                         } else {
3195                                 int new_data_end = offset +
3196                                         conn->sess->sess_ops->MaxBurstLength;
3197
3198                                 if (new_data_end > cmd->se_cmd.data_length)
3199                                         xfer_len = cmd->se_cmd.data_length - offset;
3200                                 else
3201                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3202                         }
3203
3204                         if ((s32)xfer_len < 0) {
3205                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3206                                 break;
3207                         }
3208
3209                         cmd->r2t_offset += xfer_len;
3210
3211                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3212                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3213                 } else {
3214                         struct iscsi_seq *seq;
3215
3216                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3217                         if (!seq) {
3218                                 spin_unlock_bh(&cmd->r2t_lock);
3219                                 return -1;
3220                         }
3221
3222                         offset = seq->offset;
3223                         xfer_len = seq->xfer_len;
3224
3225                         if (cmd->seq_send_order == cmd->seq_count)
3226                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3227                 }
3228                 cmd->outstanding_r2ts++;
3229                 first_r2t = 0;
3230
3231                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3232                         spin_unlock_bh(&cmd->r2t_lock);
3233                         return -1;
3234                 }
3235
3236                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3237                         break;
3238         }
3239         spin_unlock_bh(&cmd->r2t_lock);
3240
3241         return 0;
3242 }
3243 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3244
3245 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3246                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3247 {
3248         if (inc_stat_sn)
3249                 cmd->stat_sn = conn->stat_sn++;
3250
3251         atomic_long_inc(&conn->sess->rsp_pdus);
3252
3253         memset(hdr, 0, ISCSI_HDR_LEN);
3254         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3255         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3256         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3257                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3258                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3259         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3260                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3261                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3262         }
3263         hdr->response           = cmd->iscsi_response;
3264         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3265         hdr->itt                = cmd->init_task_tag;
3266         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3267
3268         iscsit_increment_maxcmdsn(cmd, conn->sess);
3269         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3270         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3271
3272         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3273                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3274                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3275                 cmd->se_cmd.scsi_status, conn->cid);
3276 }
3277 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3278
3279 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3280 {
3281         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3282         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3283         void *data_buf = NULL;
3284         u32 padding = 0, data_buf_len = 0;
3285
3286         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3287
3288         /*
3289          * Attach SENSE DATA payload to iSCSI Response PDU
3290          */
3291         if (cmd->se_cmd.sense_buffer &&
3292            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3293             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3294                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3295                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3296
3297                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3298                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3299                 data_buf = cmd->sense_buffer;
3300                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3301
3302                 if (padding) {
3303                         memset(cmd->sense_buffer +
3304                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3305                         pr_debug("Adding %u bytes of padding to"
3306                                 " SENSE.\n", padding);
3307                 }
3308
3309                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3310                                 " Response PDU\n",
3311                                 cmd->se_cmd.scsi_sense_length);
3312         }
3313
3314         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3315                                                      data_buf_len);
3316 }
3317
3318 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3319 {
3320         switch (se_tmr->response) {
3321         case TMR_FUNCTION_COMPLETE:
3322                 return ISCSI_TMF_RSP_COMPLETE;
3323         case TMR_TASK_DOES_NOT_EXIST:
3324                 return ISCSI_TMF_RSP_NO_TASK;
3325         case TMR_LUN_DOES_NOT_EXIST:
3326                 return ISCSI_TMF_RSP_NO_LUN;
3327         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3328                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3329         case TMR_FUNCTION_REJECTED:
3330         default:
3331                 return ISCSI_TMF_RSP_REJECTED;
3332         }
3333 }
3334
3335 void
3336 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3337                           struct iscsi_tm_rsp *hdr)
3338 {
3339         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3340
3341         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3342         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3343         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3344         hdr->itt                = cmd->init_task_tag;
3345         cmd->stat_sn            = conn->stat_sn++;
3346         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3347
3348         iscsit_increment_maxcmdsn(cmd, conn->sess);
3349         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3350         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3351
3352         pr_debug("Built Task Management Response ITT: 0x%08x,"
3353                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3354                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3355 }
3356 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3357
3358 static int
3359 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3360 {
3361         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3362
3363         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3364
3365         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3366 }
3367
3368 #define SENDTARGETS_BUF_LIMIT 32768U
3369
3370 static int
3371 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3372                                   enum iscsit_transport_type network_transport,
3373                                   int skip_bytes, bool *completed)
3374 {
3375         char *payload = NULL;
3376         struct iscsit_conn *conn = cmd->conn;
3377         struct iscsi_portal_group *tpg;
3378         struct iscsi_tiqn *tiqn;
3379         struct iscsi_tpg_np *tpg_np;
3380         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3381         int target_name_printed;
3382         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3383         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3384         bool active;
3385
3386         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3387                          SENDTARGETS_BUF_LIMIT);
3388
3389         payload = kzalloc(buffer_len, GFP_KERNEL);
3390         if (!payload)
3391                 return -ENOMEM;
3392
3393         /*
3394          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3395          * explicit case..
3396          */
3397         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3398                 text_ptr = strchr(text_in, '=');
3399                 if (!text_ptr) {
3400                         pr_err("Unable to locate '=' string in text_in:"
3401                                " %s\n", text_in);
3402                         kfree(payload);
3403                         return -EINVAL;
3404                 }
3405                 /*
3406                  * Skip over '=' character..
3407                  */
3408                 text_ptr += 1;
3409         }
3410
3411         spin_lock(&tiqn_lock);
3412         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3413                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3414                      strcmp(tiqn->tiqn, text_ptr)) {
3415                         continue;
3416                 }
3417
3418                 target_name_printed = 0;
3419
3420                 spin_lock(&tiqn->tiqn_tpg_lock);
3421                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3422
3423                         /* If demo_mode_discovery=0 and generate_node_acls=0
3424                          * (demo mode dislabed) do not return
3425                          * TargetName+TargetAddress unless a NodeACL exists.
3426                          */
3427
3428                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3429                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3430                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3431                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3432                                 continue;
3433                         }
3434
3435                         spin_lock(&tpg->tpg_state_lock);
3436                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3437                         spin_unlock(&tpg->tpg_state_lock);
3438
3439                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3440                                 continue;
3441
3442                         spin_lock(&tpg->tpg_np_lock);
3443                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3444                                                 tpg_np_list) {
3445                                 struct iscsi_np *np = tpg_np->tpg_np;
3446                                 struct sockaddr_storage *sockaddr;
3447
3448                                 if (np->np_network_transport != network_transport)
3449                                         continue;
3450
3451                                 if (!target_name_printed) {
3452                                         len = sprintf(buf, "TargetName=%s",
3453                                                       tiqn->tiqn);
3454                                         len += 1;
3455
3456                                         if ((len + payload_len) > buffer_len) {
3457                                                 spin_unlock(&tpg->tpg_np_lock);
3458                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3459                                                 end_of_buf = 1;
3460                                                 goto eob;
3461                                         }
3462
3463                                         if (skip_bytes && len <= skip_bytes) {
3464                                                 skip_bytes -= len;
3465                                         } else {
3466                                                 memcpy(payload + payload_len, buf, len);
3467                                                 payload_len += len;
3468                                                 target_name_printed = 1;
3469                                                 if (len > skip_bytes)
3470                                                         skip_bytes = 0;
3471                                         }
3472                                 }
3473
3474                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3475                                         sockaddr = &conn->local_sockaddr;
3476                                 else
3477                                         sockaddr = &np->np_sockaddr;
3478
3479                                 len = sprintf(buf, "TargetAddress="
3480                                               "%pISpc,%hu",
3481                                               sockaddr,
3482                                               tpg->tpgt);
3483                                 len += 1;
3484
3485                                 if ((len + payload_len) > buffer_len) {
3486                                         spin_unlock(&tpg->tpg_np_lock);
3487                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3488                                         end_of_buf = 1;
3489                                         goto eob;
3490                                 }
3491
3492                                 if (skip_bytes && len <= skip_bytes) {
3493                                         skip_bytes -= len;
3494                                 } else {
3495                                         memcpy(payload + payload_len, buf, len);
3496                                         payload_len += len;
3497                                         if (len > skip_bytes)
3498                                                 skip_bytes = 0;
3499                                 }
3500                         }
3501                         spin_unlock(&tpg->tpg_np_lock);
3502                 }
3503                 spin_unlock(&tiqn->tiqn_tpg_lock);
3504 eob:
3505                 if (end_of_buf) {
3506                         *completed = false;
3507                         break;
3508                 }
3509
3510                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3511                         break;
3512         }
3513         spin_unlock(&tiqn_lock);
3514
3515         cmd->buf_ptr = payload;
3516
3517         return payload_len;
3518 }
3519
3520 int
3521 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3522                       struct iscsi_text_rsp *hdr,
3523                       enum iscsit_transport_type network_transport)
3524 {
3525         int text_length, padding;
3526         bool completed = true;
3527
3528         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3529                                                         cmd->read_data_done,
3530                                                         &completed);
3531         if (text_length < 0)
3532                 return text_length;
3533
3534         if (completed) {
3535                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3536         } else {
3537                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3538                 cmd->read_data_done += text_length;
3539                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3540                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3541         }
3542         hdr->opcode = ISCSI_OP_TEXT_RSP;
3543         padding = ((-text_length) & 3);
3544         hton24(hdr->dlength, text_length);
3545         hdr->itt = cmd->init_task_tag;
3546         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3547         cmd->stat_sn = conn->stat_sn++;
3548         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3549
3550         iscsit_increment_maxcmdsn(cmd, conn->sess);
3551         /*
3552          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3553          * correctly increment MaxCmdSN for each response answering a
3554          * non immediate text request with a valid CmdSN.
3555          */
3556         cmd->maxcmdsn_inc = 0;
3557         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3558         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3559
3560         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3561                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3562                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3563                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3564                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3565
3566         return text_length + padding;
3567 }
3568 EXPORT_SYMBOL(iscsit_build_text_rsp);
3569
3570 static int iscsit_send_text_rsp(
3571         struct iscsit_cmd *cmd,
3572         struct iscsit_conn *conn)
3573 {
3574         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3575         int text_length;
3576
3577         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3578                                 conn->conn_transport->transport_type);
3579         if (text_length < 0)
3580                 return text_length;
3581
3582         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3583                                                      cmd->buf_ptr,
3584                                                      text_length);
3585 }
3586
3587 void
3588 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3589                     struct iscsi_reject *hdr)
3590 {
3591         hdr->opcode             = ISCSI_OP_REJECT;
3592         hdr->reason             = cmd->reject_reason;
3593         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3594         hton24(hdr->dlength, ISCSI_HDR_LEN);
3595         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3596         cmd->stat_sn            = conn->stat_sn++;
3597         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3598         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3599         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3600
3601 }
3602 EXPORT_SYMBOL(iscsit_build_reject);
3603
3604 static int iscsit_send_reject(
3605         struct iscsit_cmd *cmd,
3606         struct iscsit_conn *conn)
3607 {
3608         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3609
3610         iscsit_build_reject(cmd, conn, hdr);
3611
3612         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3613                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3614
3615         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3616                                                      cmd->buf_ptr,
3617                                                      ISCSI_HDR_LEN);
3618 }
3619
3620 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3621 {
3622         int ord, cpu;
3623         cpumask_var_t conn_allowed_cpumask;
3624
3625         /*
3626          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3627          * within iscsit_start_kthreads()
3628          *
3629          * Here we use bitmap_id to determine which CPU that this
3630          * iSCSI connection's RX/TX threads will be scheduled to
3631          * execute upon.
3632          */
3633         if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3634                 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3635                 for_each_online_cpu(cpu) {
3636                         if (ord-- == 0) {
3637                                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3638                                 return;
3639                         }
3640                 }
3641         } else {
3642                 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3643                         cpu_online_mask);
3644
3645                 cpumask_clear(conn->conn_cpumask);
3646                 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3647                 for_each_cpu(cpu, conn_allowed_cpumask) {
3648                         if (ord-- == 0) {
3649                                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3650                                 free_cpumask_var(conn_allowed_cpumask);
3651                                 return;
3652                         }
3653                 }
3654                 free_cpumask_var(conn_allowed_cpumask);
3655         }
3656         /*
3657          * This should never be reached..
3658          */
3659         dump_stack();
3660         cpumask_setall(conn->conn_cpumask);
3661 }
3662
3663 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3664 {
3665         /*
3666          * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3667          * connection's RX/TX threads update conn->allowed_cpumask.
3668          */
3669         if (!cpumask_equal(iscsit_global->allowed_cpumask,
3670                            conn->allowed_cpumask)) {
3671                 iscsit_thread_get_cpumask(conn);
3672                 conn->conn_tx_reset_cpumask = 1;
3673                 conn->conn_rx_reset_cpumask = 1;
3674                 cpumask_copy(conn->allowed_cpumask,
3675                              iscsit_global->allowed_cpumask);
3676         }
3677 }
3678
3679 void iscsit_thread_check_cpumask(
3680         struct iscsit_conn *conn,
3681         struct task_struct *p,
3682         int mode)
3683 {
3684         /*
3685          * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3686          * at the same time. The RX thread might be faster and return from
3687          * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3688          * Then the TX thread sets it back to 1.
3689          * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3690          * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3691          */
3692         iscsit_thread_reschedule(conn);
3693
3694         /*
3695          * mode == 1 signals iscsi_target_tx_thread() usage.
3696          * mode == 0 signals iscsi_target_rx_thread() usage.
3697          */
3698         if (mode == 1) {
3699                 if (!conn->conn_tx_reset_cpumask)
3700                         return;
3701         } else {
3702                 if (!conn->conn_rx_reset_cpumask)
3703                         return;
3704         }
3705
3706         /*
3707          * Update the CPU mask for this single kthread so that
3708          * both TX and RX kthreads are scheduled to run on the
3709          * same CPU.
3710          */
3711         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3712         if (mode == 1)
3713                 conn->conn_tx_reset_cpumask = 0;
3714         else
3715                 conn->conn_rx_reset_cpumask = 0;
3716 }
3717 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3718
3719 int
3720 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3721 {
3722         int ret;
3723
3724         switch (state) {
3725         case ISTATE_SEND_R2T:
3726                 ret = iscsit_send_r2t(cmd, conn);
3727                 if (ret < 0)
3728                         goto err;
3729                 break;
3730         case ISTATE_REMOVE:
3731                 spin_lock_bh(&conn->cmd_lock);
3732                 list_del_init(&cmd->i_conn_node);
3733                 spin_unlock_bh(&conn->cmd_lock);
3734
3735                 iscsit_free_cmd(cmd, false);
3736                 break;
3737         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3738                 iscsit_mod_nopin_response_timer(conn);
3739                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3740                 if (ret < 0)
3741                         goto err;
3742                 break;
3743         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3744                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3745                 if (ret < 0)
3746                         goto err;
3747                 break;
3748         default:
3749                 pr_err("Unknown Opcode: 0x%02x ITT:"
3750                        " 0x%08x, i_state: %d on CID: %hu\n",
3751                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3752                        conn->cid);
3753                 goto err;
3754         }
3755
3756         return 0;
3757
3758 err:
3759         return -1;
3760 }
3761 EXPORT_SYMBOL(iscsit_immediate_queue);
3762
3763 static int
3764 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3765 {
3766         struct iscsit_transport *t = conn->conn_transport;
3767         struct iscsi_queue_req *qr;
3768         struct iscsit_cmd *cmd;
3769         u8 state;
3770         int ret;
3771
3772         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3773                 atomic_set(&conn->check_immediate_queue, 0);
3774                 cmd = qr->cmd;
3775                 state = qr->state;
3776                 kmem_cache_free(lio_qr_cache, qr);
3777
3778                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3779                 if (ret < 0)
3780                         return ret;
3781         }
3782
3783         return 0;
3784 }
3785
3786 int
3787 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3788 {
3789         int ret;
3790
3791 check_rsp_state:
3792         switch (state) {
3793         case ISTATE_SEND_DATAIN:
3794                 ret = iscsit_send_datain(cmd, conn);
3795                 if (ret < 0)
3796                         goto err;
3797                 else if (!ret)
3798                         /* more drs */
3799                         goto check_rsp_state;
3800                 else if (ret == 1) {
3801                         /* all done */
3802                         spin_lock_bh(&cmd->istate_lock);
3803                         cmd->i_state = ISTATE_SENT_STATUS;
3804                         spin_unlock_bh(&cmd->istate_lock);
3805
3806                         if (atomic_read(&conn->check_immediate_queue))
3807                                 return 1;
3808
3809                         return 0;
3810                 } else if (ret == 2) {
3811                         /* Still must send status,
3812                            SCF_TRANSPORT_TASK_SENSE was set */
3813                         spin_lock_bh(&cmd->istate_lock);
3814                         cmd->i_state = ISTATE_SEND_STATUS;
3815                         spin_unlock_bh(&cmd->istate_lock);
3816                         state = ISTATE_SEND_STATUS;
3817                         goto check_rsp_state;
3818                 }
3819
3820                 break;
3821         case ISTATE_SEND_STATUS:
3822         case ISTATE_SEND_STATUS_RECOVERY:
3823                 ret = iscsit_send_response(cmd, conn);
3824                 break;
3825         case ISTATE_SEND_LOGOUTRSP:
3826                 ret = iscsit_send_logout(cmd, conn);
3827                 break;
3828         case ISTATE_SEND_ASYNCMSG:
3829                 ret = iscsit_send_conn_drop_async_message(
3830                         cmd, conn);
3831                 break;
3832         case ISTATE_SEND_NOPIN:
3833                 ret = iscsit_send_nopin(cmd, conn);
3834                 break;
3835         case ISTATE_SEND_REJECT:
3836                 ret = iscsit_send_reject(cmd, conn);
3837                 break;
3838         case ISTATE_SEND_TASKMGTRSP:
3839                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3840                 if (ret != 0)
3841                         break;
3842                 ret = iscsit_tmr_post_handler(cmd, conn);
3843                 if (ret != 0)
3844                         iscsit_fall_back_to_erl0(conn->sess);
3845                 break;
3846         case ISTATE_SEND_TEXTRSP:
3847                 ret = iscsit_send_text_rsp(cmd, conn);
3848                 break;
3849         default:
3850                 pr_err("Unknown Opcode: 0x%02x ITT:"
3851                        " 0x%08x, i_state: %d on CID: %hu\n",
3852                        cmd->iscsi_opcode, cmd->init_task_tag,
3853                        state, conn->cid);
3854                 goto err;
3855         }
3856         if (ret < 0)
3857                 goto err;
3858
3859         switch (state) {
3860         case ISTATE_SEND_LOGOUTRSP:
3861                 if (!iscsit_logout_post_handler(cmd, conn))
3862                         return -ECONNRESET;
3863                 fallthrough;
3864         case ISTATE_SEND_STATUS:
3865         case ISTATE_SEND_ASYNCMSG:
3866         case ISTATE_SEND_NOPIN:
3867         case ISTATE_SEND_STATUS_RECOVERY:
3868         case ISTATE_SEND_TEXTRSP:
3869         case ISTATE_SEND_TASKMGTRSP:
3870         case ISTATE_SEND_REJECT:
3871                 spin_lock_bh(&cmd->istate_lock);
3872                 cmd->i_state = ISTATE_SENT_STATUS;
3873                 spin_unlock_bh(&cmd->istate_lock);
3874                 break;
3875         default:
3876                 pr_err("Unknown Opcode: 0x%02x ITT:"
3877                        " 0x%08x, i_state: %d on CID: %hu\n",
3878                        cmd->iscsi_opcode, cmd->init_task_tag,
3879                        cmd->i_state, conn->cid);
3880                 goto err;
3881         }
3882
3883         if (atomic_read(&conn->check_immediate_queue))
3884                 return 1;
3885
3886         return 0;
3887
3888 err:
3889         return -1;
3890 }
3891 EXPORT_SYMBOL(iscsit_response_queue);
3892
3893 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3894 {
3895         struct iscsit_transport *t = conn->conn_transport;
3896         struct iscsi_queue_req *qr;
3897         struct iscsit_cmd *cmd;
3898         u8 state;
3899         int ret;
3900
3901         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3902                 cmd = qr->cmd;
3903                 state = qr->state;
3904                 kmem_cache_free(lio_qr_cache, qr);
3905
3906                 ret = t->iscsit_response_queue(conn, cmd, state);
3907                 if (ret == 1 || ret < 0)
3908                         return ret;
3909         }
3910
3911         return 0;
3912 }
3913
3914 int iscsi_target_tx_thread(void *arg)
3915 {
3916         int ret = 0;
3917         struct iscsit_conn *conn = arg;
3918         bool conn_freed = false;
3919
3920         /*
3921          * Allow ourselves to be interrupted by SIGINT so that a
3922          * connection recovery / failure event can be triggered externally.
3923          */
3924         allow_signal(SIGINT);
3925
3926         while (!kthread_should_stop()) {
3927                 /*
3928                  * Ensure that both TX and RX per connection kthreads
3929                  * are scheduled to run on the same CPU.
3930                  */
3931                 iscsit_thread_check_cpumask(conn, current, 1);
3932
3933                 wait_event_interruptible(conn->queues_wq,
3934                                          !iscsit_conn_all_queues_empty(conn));
3935
3936                 if (signal_pending(current))
3937                         goto transport_err;
3938
3939 get_immediate:
3940                 ret = iscsit_handle_immediate_queue(conn);
3941                 if (ret < 0)
3942                         goto transport_err;
3943
3944                 ret = iscsit_handle_response_queue(conn);
3945                 if (ret == 1) {
3946                         goto get_immediate;
3947                 } else if (ret == -ECONNRESET) {
3948                         conn_freed = true;
3949                         goto out;
3950                 } else if (ret < 0) {
3951                         goto transport_err;
3952                 }
3953         }
3954
3955 transport_err:
3956         /*
3957          * Avoid the normal connection failure code-path if this connection
3958          * is still within LOGIN mode, and iscsi_np process context is
3959          * responsible for cleaning up the early connection failure.
3960          */
3961         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3962                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3963 out:
3964         if (!conn_freed) {
3965                 while (!kthread_should_stop()) {
3966                         msleep(100);
3967                 }
3968         }
3969         return 0;
3970 }
3971
3972 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3973 {
3974         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3975         struct iscsit_cmd *cmd;
3976         int ret = 0;
3977
3978         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3979         case ISCSI_OP_SCSI_CMD:
3980                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3981                 if (!cmd)
3982                         goto reject;
3983
3984                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3985                 break;
3986         case ISCSI_OP_SCSI_DATA_OUT:
3987                 ret = iscsit_handle_data_out(conn, buf);
3988                 break;
3989         case ISCSI_OP_NOOP_OUT:
3990                 cmd = NULL;
3991                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3992                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3993                         if (!cmd)
3994                                 goto reject;
3995                 }
3996                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3997                 break;
3998         case ISCSI_OP_SCSI_TMFUNC:
3999                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4000                 if (!cmd)
4001                         goto reject;
4002
4003                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4004                 break;
4005         case ISCSI_OP_TEXT:
4006                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4007                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4008                         if (!cmd)
4009                                 goto reject;
4010                 } else {
4011                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4012                         if (!cmd)
4013                                 goto reject;
4014                 }
4015
4016                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4017                 break;
4018         case ISCSI_OP_LOGOUT:
4019                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4020                 if (!cmd)
4021                         goto reject;
4022
4023                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4024                 if (ret > 0)
4025                         wait_for_completion_timeout(&conn->conn_logout_comp,
4026                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4027                 break;
4028         case ISCSI_OP_SNACK:
4029                 ret = iscsit_handle_snack(conn, buf);
4030                 break;
4031         default:
4032                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4033                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4034                         pr_err("Cannot recover from unknown"
4035                         " opcode while ERL=0, closing iSCSI connection.\n");
4036                         return -1;
4037                 }
4038                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4039                        " closing iSCSI connection.\n");
4040                 ret = -1;
4041                 break;
4042         }
4043
4044         return ret;
4045 reject:
4046         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4047 }
4048
4049 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4050 {
4051         bool ret;
4052
4053         spin_lock_bh(&conn->state_lock);
4054         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4055         spin_unlock_bh(&conn->state_lock);
4056
4057         return ret;
4058 }
4059
4060 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4061 {
4062         int ret;
4063         u8 *buffer, *tmp_buf, opcode;
4064         u32 checksum = 0, digest = 0;
4065         struct iscsi_hdr *hdr;
4066         struct kvec iov;
4067
4068         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4069         if (!buffer)
4070                 return;
4071
4072         while (!kthread_should_stop()) {
4073                 /*
4074                  * Ensure that both TX and RX per connection kthreads
4075                  * are scheduled to run on the same CPU.
4076                  */
4077                 iscsit_thread_check_cpumask(conn, current, 0);
4078
4079                 memset(&iov, 0, sizeof(struct kvec));
4080
4081                 iov.iov_base    = buffer;
4082                 iov.iov_len     = ISCSI_HDR_LEN;
4083
4084                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4085                 if (ret != ISCSI_HDR_LEN) {
4086                         iscsit_rx_thread_wait_for_tcp(conn);
4087                         break;
4088                 }
4089
4090                 hdr = (struct iscsi_hdr *) buffer;
4091                 if (hdr->hlength) {
4092                         iov.iov_len = hdr->hlength * 4;
4093                         tmp_buf = krealloc(buffer,
4094                                           ISCSI_HDR_LEN + iov.iov_len,
4095                                           GFP_KERNEL);
4096                         if (!tmp_buf)
4097                                 break;
4098
4099                         buffer = tmp_buf;
4100                         iov.iov_base = &buffer[ISCSI_HDR_LEN];
4101
4102                         ret = rx_data(conn, &iov, 1, iov.iov_len);
4103                         if (ret != iov.iov_len) {
4104                                 iscsit_rx_thread_wait_for_tcp(conn);
4105                                 break;
4106                         }
4107                 }
4108
4109                 if (conn->conn_ops->HeaderDigest) {
4110                         iov.iov_base    = &digest;
4111                         iov.iov_len     = ISCSI_CRC_LEN;
4112
4113                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4114                         if (ret != ISCSI_CRC_LEN) {
4115                                 iscsit_rx_thread_wait_for_tcp(conn);
4116                                 break;
4117                         }
4118
4119                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
4120                                                   ISCSI_HDR_LEN, 0, NULL,
4121                                                   &checksum);
4122
4123                         if (digest != checksum) {
4124                                 pr_err("HeaderDigest CRC32C failed,"
4125                                         " received 0x%08x, computed 0x%08x\n",
4126                                         digest, checksum);
4127                                 /*
4128                                  * Set the PDU to 0xff so it will intentionally
4129                                  * hit default in the switch below.
4130                                  */
4131                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4132                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4133                         } else {
4134                                 pr_debug("Got HeaderDigest CRC32C"
4135                                                 " 0x%08x\n", checksum);
4136                         }
4137                 }
4138
4139                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4140                         break;
4141
4142                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4143
4144                 if (conn->sess->sess_ops->SessionType &&
4145                    ((!(opcode & ISCSI_OP_TEXT)) ||
4146                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4147                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4148                         " while in Discovery Session, rejecting.\n", opcode);
4149                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4150                                           buffer);
4151                         break;
4152                 }
4153
4154                 ret = iscsi_target_rx_opcode(conn, buffer);
4155                 if (ret < 0)
4156                         break;
4157         }
4158
4159         kfree(buffer);
4160 }
4161
4162 int iscsi_target_rx_thread(void *arg)
4163 {
4164         int rc;
4165         struct iscsit_conn *conn = arg;
4166         bool conn_freed = false;
4167
4168         /*
4169          * Allow ourselves to be interrupted by SIGINT so that a
4170          * connection recovery / failure event can be triggered externally.
4171          */
4172         allow_signal(SIGINT);
4173         /*
4174          * Wait for iscsi_post_login_handler() to complete before allowing
4175          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4176          */
4177         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4178         if (rc < 0 || iscsi_target_check_conn_state(conn))
4179                 goto out;
4180
4181         if (!conn->conn_transport->iscsit_get_rx_pdu)
4182                 return 0;
4183
4184         conn->conn_transport->iscsit_get_rx_pdu(conn);
4185
4186         if (!signal_pending(current))
4187                 atomic_set(&conn->transport_failed, 1);
4188         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4189
4190 out:
4191         if (!conn_freed) {
4192                 while (!kthread_should_stop()) {
4193                         msleep(100);
4194                 }
4195         }
4196
4197         return 0;
4198 }
4199
4200 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4201 {
4202         LIST_HEAD(tmp_list);
4203         struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4204         struct iscsit_session *sess = conn->sess;
4205         /*
4206          * We expect this function to only ever be called from either RX or TX
4207          * thread context via iscsit_close_connection() once the other context
4208          * has been reset -> returned sleeping pre-handler state.
4209          */
4210         spin_lock_bh(&conn->cmd_lock);
4211         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4212
4213         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4214                 struct se_cmd *se_cmd = &cmd->se_cmd;
4215
4216                 if (!se_cmd->se_tfo)
4217                         continue;
4218
4219                 spin_lock_irq(&se_cmd->t_state_lock);
4220                 if (se_cmd->transport_state & CMD_T_ABORTED) {
4221                         if (!(se_cmd->transport_state & CMD_T_TAS))
4222                                 /*
4223                                  * LIO's abort path owns the cleanup for this,
4224                                  * so put it back on the list and let
4225                                  * aborted_task handle it.
4226                                  */
4227                                 list_move_tail(&cmd->i_conn_node,
4228                                                &conn->conn_cmd_list);
4229                 } else {
4230                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4231                 }
4232
4233                 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
4234                         /*
4235                          * We never submitted the cmd to LIO core, so we have
4236                          * to tell LIO to perform the completion process.
4237                          */
4238                         spin_unlock_irq(&se_cmd->t_state_lock);
4239                         target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED);
4240                         continue;
4241                 }
4242                 spin_unlock_irq(&se_cmd->t_state_lock);
4243         }
4244         spin_unlock_bh(&conn->cmd_lock);
4245
4246         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4247                 list_del_init(&cmd->i_conn_node);
4248
4249                 iscsit_increment_maxcmdsn(cmd, sess);
4250                 iscsit_free_cmd(cmd, true);
4251
4252         }
4253
4254         /*
4255          * Wait on commands that were cleaned up via the aborted_task path.
4256          * LLDs that implement iscsit_wait_conn will already have waited for
4257          * commands.
4258          */
4259         if (!conn->conn_transport->iscsit_wait_conn) {
4260                 target_stop_cmd_counter(conn->cmd_cnt);
4261                 target_wait_for_cmds(conn->cmd_cnt);
4262         }
4263 }
4264
4265 static void iscsit_stop_timers_for_cmds(
4266         struct iscsit_conn *conn)
4267 {
4268         struct iscsit_cmd *cmd;
4269
4270         spin_lock_bh(&conn->cmd_lock);
4271         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4272                 if (cmd->data_direction == DMA_TO_DEVICE)
4273                         iscsit_stop_dataout_timer(cmd);
4274         }
4275         spin_unlock_bh(&conn->cmd_lock);
4276 }
4277
4278 int iscsit_close_connection(
4279         struct iscsit_conn *conn)
4280 {
4281         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4282         struct iscsit_session   *sess = conn->sess;
4283
4284         pr_debug("Closing iSCSI connection CID %hu on SID:"
4285                 " %u\n", conn->cid, sess->sid);
4286         /*
4287          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4288          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4289          * sleeping and the logout response never got sent because the
4290          * connection failed.
4291          *
4292          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4293          * to signal logout response TX interrupt completion.  Go ahead and skip
4294          * this for iser since isert_rx_opcode() does not wait on logout failure,
4295          * and to avoid iscsit_conn pointer dereference in iser-target code.
4296          */
4297         if (!conn->conn_transport->rdma_shutdown)
4298                 complete(&conn->conn_logout_comp);
4299
4300         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4301                 if (conn->tx_thread &&
4302                     cmpxchg(&conn->tx_thread_active, true, false)) {
4303                         send_sig(SIGINT, conn->tx_thread, 1);
4304                         kthread_stop(conn->tx_thread);
4305                 }
4306         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4307                 if (conn->rx_thread &&
4308                     cmpxchg(&conn->rx_thread_active, true, false)) {
4309                         send_sig(SIGINT, conn->rx_thread, 1);
4310                         kthread_stop(conn->rx_thread);
4311                 }
4312         }
4313
4314         spin_lock(&iscsit_global->ts_bitmap_lock);
4315         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4316                               get_order(1));
4317         spin_unlock(&iscsit_global->ts_bitmap_lock);
4318
4319         iscsit_stop_timers_for_cmds(conn);
4320         iscsit_stop_nopin_response_timer(conn);
4321         iscsit_stop_nopin_timer(conn);
4322
4323         if (conn->conn_transport->iscsit_wait_conn)
4324                 conn->conn_transport->iscsit_wait_conn(conn);
4325
4326         /*
4327          * During Connection recovery drop unacknowledged out of order
4328          * commands for this connection, and prepare the other commands
4329          * for reallegiance.
4330          *
4331          * During normal operation clear the out of order commands (but
4332          * do not free the struct iscsi_ooo_cmdsn's) and release all
4333          * struct iscsit_cmds.
4334          */
4335         if (atomic_read(&conn->connection_recovery)) {
4336                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4337                 iscsit_prepare_cmds_for_reallegiance(conn);
4338         } else {
4339                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4340                 iscsit_release_commands_from_conn(conn);
4341         }
4342         iscsit_free_queue_reqs_for_conn(conn);
4343
4344         /*
4345          * Handle decrementing session or connection usage count if
4346          * a logout response was not able to be sent because the
4347          * connection failed.  Fall back to Session Recovery here.
4348          */
4349         if (atomic_read(&conn->conn_logout_remove)) {
4350                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4351                         iscsit_dec_conn_usage_count(conn);
4352                         iscsit_dec_session_usage_count(sess);
4353                 }
4354                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4355                         iscsit_dec_conn_usage_count(conn);
4356
4357                 atomic_set(&conn->conn_logout_remove, 0);
4358                 atomic_set(&sess->session_reinstatement, 0);
4359                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4360         }
4361
4362         spin_lock_bh(&sess->conn_lock);
4363         list_del(&conn->conn_list);
4364
4365         /*
4366          * Attempt to let the Initiator know this connection failed by
4367          * sending an Connection Dropped Async Message on another
4368          * active connection.
4369          */
4370         if (atomic_read(&conn->connection_recovery))
4371                 iscsit_build_conn_drop_async_message(conn);
4372
4373         spin_unlock_bh(&sess->conn_lock);
4374
4375         /*
4376          * If connection reinstatement is being performed on this connection,
4377          * up the connection reinstatement semaphore that is being blocked on
4378          * in iscsit_cause_connection_reinstatement().
4379          */
4380         spin_lock_bh(&conn->state_lock);
4381         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4382                 spin_unlock_bh(&conn->state_lock);
4383                 complete(&conn->conn_wait_comp);
4384                 wait_for_completion(&conn->conn_post_wait_comp);
4385                 spin_lock_bh(&conn->state_lock);
4386         }
4387
4388         /*
4389          * If connection reinstatement is being performed on this connection
4390          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4391          * connection wait rcfr semaphore that is being blocked on
4392          * an iscsit_connection_reinstatement_rcfr().
4393          */
4394         if (atomic_read(&conn->connection_wait_rcfr)) {
4395                 spin_unlock_bh(&conn->state_lock);
4396                 complete(&conn->conn_wait_rcfr_comp);
4397                 wait_for_completion(&conn->conn_post_wait_comp);
4398                 spin_lock_bh(&conn->state_lock);
4399         }
4400         atomic_set(&conn->connection_reinstatement, 1);
4401         spin_unlock_bh(&conn->state_lock);
4402
4403         /*
4404          * If any other processes are accessing this connection pointer we
4405          * must wait until they have completed.
4406          */
4407         iscsit_check_conn_usage_count(conn);
4408
4409         ahash_request_free(conn->conn_tx_hash);
4410         if (conn->conn_rx_hash) {
4411                 struct crypto_ahash *tfm;
4412
4413                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4414                 ahash_request_free(conn->conn_rx_hash);
4415                 crypto_free_ahash(tfm);
4416         }
4417
4418         if (conn->sock)
4419                 sock_release(conn->sock);
4420
4421         if (conn->conn_transport->iscsit_free_conn)
4422                 conn->conn_transport->iscsit_free_conn(conn);
4423
4424         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4425         conn->conn_state = TARG_CONN_STATE_FREE;
4426         iscsit_free_conn(conn);
4427
4428         spin_lock_bh(&sess->conn_lock);
4429         atomic_dec(&sess->nconn);
4430         pr_debug("Decremented iSCSI connection count to %d from node:"
4431                 " %s\n", atomic_read(&sess->nconn),
4432                 sess->sess_ops->InitiatorName);
4433         /*
4434          * Make sure that if one connection fails in an non ERL=2 iSCSI
4435          * Session that they all fail.
4436          */
4437         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4438              !atomic_read(&sess->session_logout))
4439                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4440
4441         /*
4442          * If this was not the last connection in the session, and we are
4443          * performing session reinstatement or falling back to ERL=0, call
4444          * iscsit_stop_session() without sleeping to shutdown the other
4445          * active connections.
4446          */
4447         if (atomic_read(&sess->nconn)) {
4448                 if (!atomic_read(&sess->session_reinstatement) &&
4449                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4450                         spin_unlock_bh(&sess->conn_lock);
4451                         return 0;
4452                 }
4453                 if (!atomic_read(&sess->session_stop_active)) {
4454                         atomic_set(&sess->session_stop_active, 1);
4455                         spin_unlock_bh(&sess->conn_lock);
4456                         iscsit_stop_session(sess, 0, 0);
4457                         return 0;
4458                 }
4459                 spin_unlock_bh(&sess->conn_lock);
4460                 return 0;
4461         }
4462
4463         /*
4464          * If this was the last connection in the session and one of the
4465          * following is occurring:
4466          *
4467          * Session Reinstatement is not being performed, and are falling back
4468          * to ERL=0 call iscsit_close_session().
4469          *
4470          * Session Logout was requested.  iscsit_close_session() will be called
4471          * elsewhere.
4472          *
4473          * Session Continuation is not being performed, start the Time2Retain
4474          * handler and check if sleep_on_sess_wait_sem is active.
4475          */
4476         if (!atomic_read(&sess->session_reinstatement) &&
4477              atomic_read(&sess->session_fall_back_to_erl0)) {
4478                 spin_unlock_bh(&sess->conn_lock);
4479                 complete_all(&sess->session_wait_comp);
4480                 iscsit_close_session(sess, true);
4481
4482                 return 0;
4483         } else if (atomic_read(&sess->session_logout)) {
4484                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4485                 sess->session_state = TARG_SESS_STATE_FREE;
4486
4487                 if (atomic_read(&sess->session_close)) {
4488                         spin_unlock_bh(&sess->conn_lock);
4489                         complete_all(&sess->session_wait_comp);
4490                         iscsit_close_session(sess, true);
4491                 } else {
4492                         spin_unlock_bh(&sess->conn_lock);
4493                 }
4494
4495                 return 0;
4496         } else {
4497                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4498                 sess->session_state = TARG_SESS_STATE_FAILED;
4499
4500                 if (!atomic_read(&sess->session_continuation))
4501                         iscsit_start_time2retain_handler(sess);
4502
4503                 if (atomic_read(&sess->session_close)) {
4504                         spin_unlock_bh(&sess->conn_lock);
4505                         complete_all(&sess->session_wait_comp);
4506                         iscsit_close_session(sess, true);
4507                 } else {
4508                         spin_unlock_bh(&sess->conn_lock);
4509                 }
4510
4511                 return 0;
4512         }
4513 }
4514
4515 /*
4516  * If the iSCSI Session for the iSCSI Initiator Node exists,
4517  * forcefully shutdown the iSCSI NEXUS.
4518  */
4519 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4520 {
4521         struct iscsi_portal_group *tpg = sess->tpg;
4522         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4523
4524         if (atomic_read(&sess->nconn)) {
4525                 pr_err("%d connection(s) still exist for iSCSI session"
4526                         " to %s\n", atomic_read(&sess->nconn),
4527                         sess->sess_ops->InitiatorName);
4528                 BUG();
4529         }
4530
4531         spin_lock_bh(&se_tpg->session_lock);
4532         atomic_set(&sess->session_logout, 1);
4533         atomic_set(&sess->session_reinstatement, 1);
4534         iscsit_stop_time2retain_timer(sess);
4535         spin_unlock_bh(&se_tpg->session_lock);
4536
4537         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4538                 iscsit_free_connection_recovery_entries(sess);
4539
4540         /*
4541          * transport_deregister_session_configfs() will clear the
4542          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4543          * can be setting it again with __transport_register_session() in
4544          * iscsi_post_login_handler() again after the iscsit_stop_session()
4545          * completes in iscsi_np context.
4546          */
4547         transport_deregister_session_configfs(sess->se_sess);
4548
4549         /*
4550          * If any other processes are accessing this session pointer we must
4551          * wait until they have completed.  If we are in an interrupt (the
4552          * time2retain handler) and contain and active session usage count we
4553          * restart the timer and exit.
4554          */
4555         if (iscsit_check_session_usage_count(sess, can_sleep)) {
4556                 atomic_set(&sess->session_logout, 0);
4557                 iscsit_start_time2retain_handler(sess);
4558                 return 0;
4559         }
4560
4561         transport_deregister_session(sess->se_sess);
4562
4563         iscsit_free_all_ooo_cmdsns(sess);
4564
4565         spin_lock_bh(&se_tpg->session_lock);
4566         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4567         sess->session_state = TARG_SESS_STATE_FREE;
4568         pr_debug("Released iSCSI session from node: %s\n",
4569                         sess->sess_ops->InitiatorName);
4570         tpg->nsessions--;
4571         if (tpg->tpg_tiqn)
4572                 tpg->tpg_tiqn->tiqn_nsessions--;
4573
4574         pr_debug("Decremented number of active iSCSI Sessions on"
4575                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4576
4577         ida_free(&sess_ida, sess->session_index);
4578         kfree(sess->sess_ops);
4579         sess->sess_ops = NULL;
4580         spin_unlock_bh(&se_tpg->session_lock);
4581
4582         kfree(sess);
4583         return 0;
4584 }
4585
4586 static void iscsit_logout_post_handler_closesession(
4587         struct iscsit_conn *conn)
4588 {
4589         struct iscsit_session *sess = conn->sess;
4590         int sleep = 1;
4591         /*
4592          * Traditional iscsi/tcp will invoke this logic from TX thread
4593          * context during session logout, so clear tx_thread_active and
4594          * sleep if iscsit_close_connection() has not already occured.
4595          *
4596          * Since iser-target invokes this logic from it's own workqueue,
4597          * always sleep waiting for RX/TX thread shutdown to complete
4598          * within iscsit_close_connection().
4599          */
4600         if (!conn->conn_transport->rdma_shutdown) {
4601                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4602                 if (!sleep)
4603                         return;
4604         }
4605
4606         atomic_set(&conn->conn_logout_remove, 0);
4607         complete(&conn->conn_logout_comp);
4608
4609         iscsit_dec_conn_usage_count(conn);
4610         atomic_set(&sess->session_close, 1);
4611         iscsit_stop_session(sess, sleep, sleep);
4612         iscsit_dec_session_usage_count(sess);
4613 }
4614
4615 static void iscsit_logout_post_handler_samecid(
4616         struct iscsit_conn *conn)
4617 {
4618         int sleep = 1;
4619
4620         if (!conn->conn_transport->rdma_shutdown) {
4621                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4622                 if (!sleep)
4623                         return;
4624         }
4625
4626         atomic_set(&conn->conn_logout_remove, 0);
4627         complete(&conn->conn_logout_comp);
4628
4629         iscsit_cause_connection_reinstatement(conn, sleep);
4630         iscsit_dec_conn_usage_count(conn);
4631 }
4632
4633 static void iscsit_logout_post_handler_diffcid(
4634         struct iscsit_conn *conn,
4635         u16 cid)
4636 {
4637         struct iscsit_conn *l_conn;
4638         struct iscsit_session *sess = conn->sess;
4639         bool conn_found = false;
4640
4641         if (!sess)
4642                 return;
4643
4644         spin_lock_bh(&sess->conn_lock);
4645         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4646                 if (l_conn->cid == cid) {
4647                         iscsit_inc_conn_usage_count(l_conn);
4648                         conn_found = true;
4649                         break;
4650                 }
4651         }
4652         spin_unlock_bh(&sess->conn_lock);
4653
4654         if (!conn_found)
4655                 return;
4656
4657         if (l_conn->sock)
4658                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4659
4660         spin_lock_bh(&l_conn->state_lock);
4661         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4662         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4663         spin_unlock_bh(&l_conn->state_lock);
4664
4665         iscsit_cause_connection_reinstatement(l_conn, 1);
4666         iscsit_dec_conn_usage_count(l_conn);
4667 }
4668
4669 /*
4670  *      Return of 0 causes the TX thread to restart.
4671  */
4672 int iscsit_logout_post_handler(
4673         struct iscsit_cmd *cmd,
4674         struct iscsit_conn *conn)
4675 {
4676         int ret = 0;
4677
4678         switch (cmd->logout_reason) {
4679         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4680                 switch (cmd->logout_response) {
4681                 case ISCSI_LOGOUT_SUCCESS:
4682                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4683                 default:
4684                         iscsit_logout_post_handler_closesession(conn);
4685                         break;
4686                 }
4687                 break;
4688         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4689                 if (conn->cid == cmd->logout_cid) {
4690                         switch (cmd->logout_response) {
4691                         case ISCSI_LOGOUT_SUCCESS:
4692                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4693                         default:
4694                                 iscsit_logout_post_handler_samecid(conn);
4695                                 break;
4696                         }
4697                 } else {
4698                         switch (cmd->logout_response) {
4699                         case ISCSI_LOGOUT_SUCCESS:
4700                                 iscsit_logout_post_handler_diffcid(conn,
4701                                         cmd->logout_cid);
4702                                 break;
4703                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4704                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4705                         default:
4706                                 break;
4707                         }
4708                         ret = 1;
4709                 }
4710                 break;
4711         case ISCSI_LOGOUT_REASON_RECOVERY:
4712                 switch (cmd->logout_response) {
4713                 case ISCSI_LOGOUT_SUCCESS:
4714                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4715                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4716                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4717                 default:
4718                         break;
4719                 }
4720                 ret = 1;
4721                 break;
4722         default:
4723                 break;
4724
4725         }
4726         return ret;
4727 }
4728 EXPORT_SYMBOL(iscsit_logout_post_handler);
4729
4730 void iscsit_fail_session(struct iscsit_session *sess)
4731 {
4732         struct iscsit_conn *conn;
4733
4734         spin_lock_bh(&sess->conn_lock);
4735         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4736                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4737                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4738         }
4739         spin_unlock_bh(&sess->conn_lock);
4740
4741         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4742         sess->session_state = TARG_SESS_STATE_FAILED;
4743 }
4744
4745 void iscsit_stop_session(
4746         struct iscsit_session *sess,
4747         int session_sleep,
4748         int connection_sleep)
4749 {
4750         u16 conn_count = atomic_read(&sess->nconn);
4751         struct iscsit_conn *conn, *conn_tmp = NULL;
4752         int is_last;
4753
4754         spin_lock_bh(&sess->conn_lock);
4755
4756         if (connection_sleep) {
4757                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4758                                 conn_list) {
4759                         if (conn_count == 0)
4760                                 break;
4761
4762                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4763                                 is_last = 1;
4764                         } else {
4765                                 iscsit_inc_conn_usage_count(conn_tmp);
4766                                 is_last = 0;
4767                         }
4768                         iscsit_inc_conn_usage_count(conn);
4769
4770                         spin_unlock_bh(&sess->conn_lock);
4771                         iscsit_cause_connection_reinstatement(conn, 1);
4772                         spin_lock_bh(&sess->conn_lock);
4773
4774                         iscsit_dec_conn_usage_count(conn);
4775                         if (is_last == 0)
4776                                 iscsit_dec_conn_usage_count(conn_tmp);
4777                         conn_count--;
4778                 }
4779         } else {
4780                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4781                         iscsit_cause_connection_reinstatement(conn, 0);
4782         }
4783
4784         if (session_sleep && atomic_read(&sess->nconn)) {
4785                 spin_unlock_bh(&sess->conn_lock);
4786                 wait_for_completion(&sess->session_wait_comp);
4787         } else
4788                 spin_unlock_bh(&sess->conn_lock);
4789 }
4790
4791 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4792 {
4793         struct iscsit_session *sess;
4794         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4795         struct se_session *se_sess, *se_sess_tmp;
4796         LIST_HEAD(free_list);
4797         int session_count = 0;
4798
4799         spin_lock_bh(&se_tpg->session_lock);
4800         if (tpg->nsessions && !force) {
4801                 spin_unlock_bh(&se_tpg->session_lock);
4802                 return -1;
4803         }
4804
4805         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4806                         sess_list) {
4807                 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4808
4809                 spin_lock(&sess->conn_lock);
4810                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4811                     atomic_read(&sess->session_logout) ||
4812                     atomic_read(&sess->session_close) ||
4813                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4814                         spin_unlock(&sess->conn_lock);
4815                         continue;
4816                 }
4817                 iscsit_inc_session_usage_count(sess);
4818                 atomic_set(&sess->session_reinstatement, 1);
4819                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4820                 atomic_set(&sess->session_close, 1);
4821                 spin_unlock(&sess->conn_lock);
4822
4823                 list_move_tail(&se_sess->sess_list, &free_list);
4824         }
4825         spin_unlock_bh(&se_tpg->session_lock);
4826
4827         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4828                 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4829
4830                 list_del_init(&se_sess->sess_list);
4831                 iscsit_stop_session(sess, 1, 1);
4832                 iscsit_dec_session_usage_count(sess);
4833                 session_count++;
4834         }
4835
4836         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4837                         " Group: %hu\n", session_count, tpg->tpgt);
4838         return 0;
4839 }
4840
4841 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4842 MODULE_VERSION("4.1.x");
4843 MODULE_AUTHOR("[email protected]");
4844 MODULE_LICENSE("GPL");
4845
4846 module_init(iscsi_target_init_module);
4847 module_exit(iscsi_target_cleanup_module);