drivers/target/iscsi/iscsi_target.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains main functions related to the iSCSI Target Core Driver.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10
  11 #include <crypto/hash.h>
  12 #include <linux/string.h>
  13 #include <linux/kthread.h>
  14 #include <linux/completion.h>
  15 #include <linux/module.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/idr.h>
  18 #include <linux/delay.h>
  19 #include <linux/sched/signal.h>
  20 #include <asm/unaligned.h>
  21 #include <linux/inet.h>
  22 #include <net/ipv6.h>
  23 #include <scsi/scsi_proto.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <scsi/scsi_tcq.h>
  26 #include <target/target_core_base.h>
  27 #include <target/target_core_fabric.h>
  28
  29 #include <target/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         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 368
 369         ret = iscsi_target_setup_login_socket(np, sockaddr);
 370         if (ret != 0) {
 371                 kfree(np);
 372                 mutex_unlock(&np_lock);
 373                 return ERR_PTR(ret);
 374         }
 375
 376         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 377         if (IS_ERR(np->np_thread)) {
 378                 pr_err("Unable to create kthread: iscsi_np\n");
 379                 ret = PTR_ERR(np->np_thread);
 380                 kfree(np);
 381                 mutex_unlock(&np_lock);
 382                 return ERR_PTR(ret);
 383         }
 384         /*
 385          * Increment the np_exports reference count now to prevent
 386          * iscsit_del_np() below from being run while a new call to
 387          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 388          * active.  We don't need to hold np->np_thread_lock at this
 389          * point because iscsi_np has not been added to g_np_list yet.
 390          */
 391         np->np_exports = 1;
 392         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 393
 394         list_add_tail(&np->np_list, &g_np_list);
 395         mutex_unlock(&np_lock);
 396
 397         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 398                 &np->np_sockaddr, np->np_transport->name);
 399
 400         return np;
 401 }
 402
 403 int iscsit_reset_np_thread(
 404         struct iscsi_np *np,
 405         struct iscsi_tpg_np *tpg_np,
 406         struct iscsi_portal_group *tpg,
 407         bool shutdown)
 408 {
 409         spin_lock_bh(&np->np_thread_lock);
 410         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 411                 spin_unlock_bh(&np->np_thread_lock);
 412                 return 0;
 413         }
 414         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 415         atomic_inc(&np->np_reset_count);
 416
 417         if (np->np_thread) {
 418                 spin_unlock_bh(&np->np_thread_lock);
 419                 send_sig(SIGINT, np->np_thread, 1);
 420                 wait_for_completion(&np->np_restart_comp);
 421                 spin_lock_bh(&np->np_thread_lock);
 422         }
 423         spin_unlock_bh(&np->np_thread_lock);
 424
 425         if (tpg_np && shutdown) {
 426                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 427
 428                 wait_for_completion(&tpg_np->tpg_np_comp);
 429         }
 430
 431         return 0;
 432 }
 433
 434 static void iscsit_free_np(struct iscsi_np *np)
 435 {
 436         if (np->np_socket)
 437                 sock_release(np->np_socket);
 438 }
 439
 440 int iscsit_del_np(struct iscsi_np *np)
 441 {
 442         spin_lock_bh(&np->np_thread_lock);
 443         np->np_exports--;
 444         if (np->np_exports) {
 445                 np->enabled = true;
 446                 spin_unlock_bh(&np->np_thread_lock);
 447                 return 0;
 448         }
 449         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 450         spin_unlock_bh(&np->np_thread_lock);
 451
 452         if (np->np_thread) {
 453                 /*
 454                  * We need to send the signal to wakeup Linux/Net
 455                  * which may be sleeping in sock_accept()..
 456                  */
 457                 send_sig(SIGINT, np->np_thread, 1);
 458                 kthread_stop(np->np_thread);
 459                 np->np_thread = NULL;
 460         }
 461
 462         np->np_transport->iscsit_free_np(np);
 463
 464         mutex_lock(&np_lock);
 465         list_del(&np->np_list);
 466         mutex_unlock(&np_lock);
 467
 468         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 469                 &np->np_sockaddr, np->np_transport->name);
 470
 471         iscsit_put_transport(np->np_transport);
 472         kfree(np);
 473         return 0;
 474 }
 475
 476 static void iscsit_get_rx_pdu(struct iscsit_conn *);
 477
 478 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
 479 {
 480         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 481 }
 482 EXPORT_SYMBOL(iscsit_queue_rsp);
 483
 484 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
 485 {
 486         spin_lock_bh(&conn->cmd_lock);
 487         if (!list_empty(&cmd->i_conn_node))
 488                 list_del_init(&cmd->i_conn_node);
 489         spin_unlock_bh(&conn->cmd_lock);
 490
 491         __iscsit_free_cmd(cmd, true);
 492 }
 493 EXPORT_SYMBOL(iscsit_aborted_task);
 494
 495 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 496                                       u32, u32, const void *, void *);
 497 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *);
 498
 499 static int
 500 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 501                           const void *data_buf, u32 data_buf_len)
 502 {
 503         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 504         struct kvec *iov;
 505         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 506         int ret;
 507
 508         iov = &cmd->iov_misc[0];
 509         iov[niov].iov_base      = cmd->pdu;
 510         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 511
 512         if (conn->conn_ops->HeaderDigest) {
 513                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 514
 515                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 516                                           ISCSI_HDR_LEN, 0, NULL,
 517                                           header_digest);
 518
 519                 iov[0].iov_len += ISCSI_CRC_LEN;
 520                 tx_size += ISCSI_CRC_LEN;
 521                 pr_debug("Attaching CRC32C HeaderDigest"
 522                          " to opcode 0x%x 0x%08x\n",
 523                          hdr->opcode, *header_digest);
 524         }
 525
 526         if (data_buf_len) {
 527                 u32 padding = ((-data_buf_len) & 3);
 528
 529                 iov[niov].iov_base      = (void *)data_buf;
 530                 iov[niov++].iov_len     = data_buf_len;
 531                 tx_size += data_buf_len;
 532
 533                 if (padding != 0) {
 534                         iov[niov].iov_base = &cmd->pad_bytes;
 535                         iov[niov++].iov_len = padding;
 536                         tx_size += padding;
 537                         pr_debug("Attaching %u additional"
 538                                  " padding bytes.\n", padding);
 539                 }
 540
 541                 if (conn->conn_ops->DataDigest) {
 542                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 543                                                   data_buf, data_buf_len,
 544                                                   padding, &cmd->pad_bytes,
 545                                                   &cmd->data_crc);
 546
 547                         iov[niov].iov_base = &cmd->data_crc;
 548                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 549                         tx_size += ISCSI_CRC_LEN;
 550                         pr_debug("Attached DataDigest for %u"
 551                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 552                                  data_buf_len, hdr->opcode, cmd->data_crc);
 553                 }
 554         }
 555
 556         cmd->iov_misc_count = niov;
 557         cmd->tx_size = tx_size;
 558
 559         ret = iscsit_send_tx_data(cmd, conn, 1);
 560         if (ret < 0) {
 561                 iscsit_tx_thread_wait_for_tcp(conn);
 562                 return ret;
 563         }
 564
 565         return 0;
 566 }
 567
 568 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
 569                             u32 data_offset, u32 data_length);
 570 static void iscsit_unmap_iovec(struct iscsit_cmd *);
 571 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *,
 572                                     u32, u32, u32, u8 *);
 573 static int
 574 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 575                        const struct iscsi_datain *datain)
 576 {
 577         struct kvec *iov;
 578         u32 iov_count = 0, tx_size = 0;
 579         int ret, iov_ret;
 580
 581         iov = &cmd->iov_data[0];
 582         iov[iov_count].iov_base = cmd->pdu;
 583         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 584         tx_size += ISCSI_HDR_LEN;
 585
 586         if (conn->conn_ops->HeaderDigest) {
 587                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 588
 589                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 590                                           ISCSI_HDR_LEN, 0, NULL,
 591                                           header_digest);
 592
 593                 iov[0].iov_len += ISCSI_CRC_LEN;
 594                 tx_size += ISCSI_CRC_LEN;
 595
 596                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 597                          *header_digest);
 598         }
 599
 600         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
 601                                    cmd->orig_iov_data_count - (iov_count + 2),
 602                                    datain->offset, datain->length);
 603         if (iov_ret < 0)
 604                 return -1;
 605
 606         iov_count += iov_ret;
 607         tx_size += datain->length;
 608
 609         cmd->padding = ((-datain->length) & 3);
 610         if (cmd->padding) {
 611                 iov[iov_count].iov_base         = cmd->pad_bytes;
 612                 iov[iov_count++].iov_len        = cmd->padding;
 613                 tx_size += cmd->padding;
 614
 615                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 616         }
 617
 618         if (conn->conn_ops->DataDigest) {
 619                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 620                                                          cmd, datain->offset,
 621                                                          datain->length,
 622                                                          cmd->padding,
 623                                                          cmd->pad_bytes);
 624
 625                 iov[iov_count].iov_base = &cmd->data_crc;
 626                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 627                 tx_size += ISCSI_CRC_LEN;
 628
 629                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 630                          datain->length + cmd->padding, cmd->data_crc);
 631         }
 632
 633         cmd->iov_data_count = iov_count;
 634         cmd->tx_size = tx_size;
 635
 636         ret = iscsit_fe_sendpage_sg(cmd, conn);
 637
 638         iscsit_unmap_iovec(cmd);
 639
 640         if (ret < 0) {
 641                 iscsit_tx_thread_wait_for_tcp(conn);
 642                 return ret;
 643         }
 644
 645         return 0;
 646 }
 647
 648 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 649                            struct iscsi_datain_req *dr, const void *buf,
 650                            u32 buf_len)
 651 {
 652         if (dr)
 653                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 654         else
 655                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 656 }
 657
 658 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn)
 659 {
 660         return TARGET_PROT_NORMAL;
 661 }
 662
 663 static struct iscsit_transport iscsi_target_transport = {
 664         .name                   = "iSCSI/TCP",
 665         .transport_type         = ISCSI_TCP,
 666         .rdma_shutdown          = false,
 667         .owner                  = NULL,
 668         .iscsit_setup_np        = iscsit_setup_np,
 669         .iscsit_accept_np       = iscsit_accept_np,
 670         .iscsit_free_np         = iscsit_free_np,
 671         .iscsit_get_login_rx    = iscsit_get_login_rx,
 672         .iscsit_put_login_tx    = iscsit_put_login_tx,
 673         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 674         .iscsit_immediate_queue = iscsit_immediate_queue,
 675         .iscsit_response_queue  = iscsit_response_queue,
 676         .iscsit_queue_data_in   = iscsit_queue_rsp,
 677         .iscsit_queue_status    = iscsit_queue_rsp,
 678         .iscsit_aborted_task    = iscsit_aborted_task,
 679         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 680         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 681         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 682 };
 683
 684 static int __init iscsi_target_init_module(void)
 685 {
 686         int ret = 0, size;
 687
 688         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 689         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 690         if (!iscsit_global)
 691                 return -1;
 692
 693         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 694         mutex_init(&auth_id_lock);
 695         idr_init(&tiqn_idr);
 696
 697         ret = target_register_template(&iscsi_ops);
 698         if (ret)
 699                 goto out;
 700
 701         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 702         iscsit_global->ts_bitmap = vzalloc(size);
 703         if (!iscsit_global->ts_bitmap)
 704                 goto configfs_out;
 705
 706         if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) {
 707                 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n");
 708                 goto bitmap_out;
 709         }
 710         cpumask_setall(iscsit_global->allowed_cpumask);
 711
 712         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 713                         sizeof(struct iscsi_queue_req),
 714                         __alignof__(struct iscsi_queue_req), 0, NULL);
 715         if (!lio_qr_cache) {
 716                 pr_err("Unable to kmem_cache_create() for"
 717                                 " lio_qr_cache\n");
 718                 goto cpumask_out;
 719         }
 720
 721         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 722                         sizeof(struct iscsi_datain_req),
 723                         __alignof__(struct iscsi_datain_req), 0, NULL);
 724         if (!lio_dr_cache) {
 725                 pr_err("Unable to kmem_cache_create() for"
 726                                 " lio_dr_cache\n");
 727                 goto qr_out;
 728         }
 729
 730         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 731                         sizeof(struct iscsi_ooo_cmdsn),
 732                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 733         if (!lio_ooo_cache) {
 734                 pr_err("Unable to kmem_cache_create() for"
 735                                 " lio_ooo_cache\n");
 736                 goto dr_out;
 737         }
 738
 739         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 740                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 741                         0, NULL);
 742         if (!lio_r2t_cache) {
 743                 pr_err("Unable to kmem_cache_create() for"
 744                                 " lio_r2t_cache\n");
 745                 goto ooo_out;
 746         }
 747
 748         iscsit_register_transport(&iscsi_target_transport);
 749
 750         if (iscsit_load_discovery_tpg() < 0)
 751                 goto r2t_out;
 752
 753         return ret;
 754 r2t_out:
 755         iscsit_unregister_transport(&iscsi_target_transport);
 756         kmem_cache_destroy(lio_r2t_cache);
 757 ooo_out:
 758         kmem_cache_destroy(lio_ooo_cache);
 759 dr_out:
 760         kmem_cache_destroy(lio_dr_cache);
 761 qr_out:
 762         kmem_cache_destroy(lio_qr_cache);
 763 cpumask_out:
 764         free_cpumask_var(iscsit_global->allowed_cpumask);
 765 bitmap_out:
 766         vfree(iscsit_global->ts_bitmap);
 767 configfs_out:
 768         /* XXX: this probably wants it to be it's own unwind step.. */
 769         if (iscsit_global->discovery_tpg)
 770                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 771         target_unregister_template(&iscsi_ops);
 772 out:
 773         kfree(iscsit_global);
 774         return -ENOMEM;
 775 }
 776
 777 static void __exit iscsi_target_cleanup_module(void)
 778 {
 779         iscsit_release_discovery_tpg();
 780         iscsit_unregister_transport(&iscsi_target_transport);
 781         kmem_cache_destroy(lio_qr_cache);
 782         kmem_cache_destroy(lio_dr_cache);
 783         kmem_cache_destroy(lio_ooo_cache);
 784         kmem_cache_destroy(lio_r2t_cache);
 785
 786         /*
 787          * Shutdown discovery sessions and disable discovery TPG
 788          */
 789         if (iscsit_global->discovery_tpg)
 790                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 791
 792         target_unregister_template(&iscsi_ops);
 793
 794         free_cpumask_var(iscsit_global->allowed_cpumask);
 795         vfree(iscsit_global->ts_bitmap);
 796         kfree(iscsit_global);
 797 }
 798
 799 int iscsit_add_reject(
 800         struct iscsit_conn *conn,
 801         u8 reason,
 802         unsigned char *buf)
 803 {
 804         struct iscsit_cmd *cmd;
 805
 806         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 807         if (!cmd)
 808                 return -1;
 809
 810         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 811         cmd->reject_reason = reason;
 812
 813         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 814         if (!cmd->buf_ptr) {
 815                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 816                 iscsit_free_cmd(cmd, false);
 817                 return -1;
 818         }
 819
 820         spin_lock_bh(&conn->cmd_lock);
 821         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 822         spin_unlock_bh(&conn->cmd_lock);
 823
 824         cmd->i_state = ISTATE_SEND_REJECT;
 825         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 826
 827         return -1;
 828 }
 829 EXPORT_SYMBOL(iscsit_add_reject);
 830
 831 static int iscsit_add_reject_from_cmd(
 832         struct iscsit_cmd *cmd,
 833         u8 reason,
 834         bool add_to_conn,
 835         unsigned char *buf)
 836 {
 837         struct iscsit_conn *conn;
 838         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 839
 840         if (!cmd->conn) {
 841                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 842                                 cmd->init_task_tag);
 843                 return -1;
 844         }
 845         conn = cmd->conn;
 846
 847         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 848         cmd->reject_reason = reason;
 849
 850         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 851         if (!cmd->buf_ptr) {
 852                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 853                 iscsit_free_cmd(cmd, false);
 854                 return -1;
 855         }
 856
 857         if (add_to_conn) {
 858                 spin_lock_bh(&conn->cmd_lock);
 859                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 860                 spin_unlock_bh(&conn->cmd_lock);
 861         }
 862
 863         cmd->i_state = ISTATE_SEND_REJECT;
 864         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 865         /*
 866          * Perform the kref_put now if se_cmd has already been setup by
 867          * scsit_setup_scsi_cmd()
 868          */
 869         if (do_put) {
 870                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 871                 target_put_sess_cmd(&cmd->se_cmd);
 872         }
 873         return -1;
 874 }
 875
 876 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason,
 877                                  unsigned char *buf)
 878 {
 879         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 880 }
 881
 882 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf)
 883 {
 884         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 885 }
 886 EXPORT_SYMBOL(iscsit_reject_cmd);
 887
 888 /*
 889  * Map some portion of the allocated scatterlist to an iovec, suitable for
 890  * kernel sockets to copy data in/out.
 891  */
 892 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec,
 893                             u32 data_offset, u32 data_length)
 894 {
 895         u32 i = 0, orig_data_length = data_length;
 896         struct scatterlist *sg;
 897         unsigned int page_off;
 898
 899         /*
 900          * We know each entry in t_data_sg contains a page.
 901          */
 902         u32 ent = data_offset / PAGE_SIZE;
 903
 904         if (!data_length)
 905                 return 0;
 906
 907         if (ent >= cmd->se_cmd.t_data_nents) {
 908                 pr_err("Initial page entry out-of-bounds\n");
 909                 goto overflow;
 910         }
 911
 912         sg = &cmd->se_cmd.t_data_sg[ent];
 913         page_off = (data_offset % PAGE_SIZE);
 914
 915         cmd->first_data_sg = sg;
 916         cmd->first_data_sg_off = page_off;
 917
 918         while (data_length) {
 919                 u32 cur_len;
 920
 921                 if (WARN_ON_ONCE(!sg || i >= nvec))
 922                         goto overflow;
 923
 924                 cur_len = min_t(u32, data_length, sg->length - page_off);
 925
 926                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 927                 iov[i].iov_len = cur_len;
 928
 929                 data_length -= cur_len;
 930                 page_off = 0;
 931                 sg = sg_next(sg);
 932                 i++;
 933         }
 934
 935         cmd->kmapped_nents = i;
 936
 937         return i;
 938
 939 overflow:
 940         pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
 941                data_offset, orig_data_length, i, nvec);
 942         for_each_sg(cmd->se_cmd.t_data_sg, sg,
 943                     cmd->se_cmd.t_data_nents, i) {
 944                 pr_err("[%d] off %d len %d\n",
 945                        i, sg->offset, sg->length);
 946         }
 947         return -1;
 948 }
 949
 950 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd)
 951 {
 952         u32 i;
 953         struct scatterlist *sg;
 954
 955         sg = cmd->first_data_sg;
 956
 957         for (i = 0; i < cmd->kmapped_nents; i++)
 958                 kunmap(sg_page(&sg[i]));
 959 }
 960
 961 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn)
 962 {
 963         LIST_HEAD(ack_list);
 964         struct iscsit_cmd *cmd, *cmd_p;
 965
 966         conn->exp_statsn = exp_statsn;
 967
 968         if (conn->sess->sess_ops->RDMAExtensions)
 969                 return;
 970
 971         spin_lock_bh(&conn->cmd_lock);
 972         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 973                 spin_lock(&cmd->istate_lock);
 974                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 975                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 976                         cmd->i_state = ISTATE_REMOVE;
 977                         spin_unlock(&cmd->istate_lock);
 978                         list_move_tail(&cmd->i_conn_node, &ack_list);
 979                         continue;
 980                 }
 981                 spin_unlock(&cmd->istate_lock);
 982         }
 983         spin_unlock_bh(&conn->cmd_lock);
 984
 985         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 986                 list_del_init(&cmd->i_conn_node);
 987                 iscsit_free_cmd(cmd, false);
 988         }
 989 }
 990
 991 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd)
 992 {
 993         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 994
 995         iov_count += ISCSI_IOV_DATA_BUFFER;
 996         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 997         if (!cmd->iov_data)
 998                 return -ENOMEM;
 999
1000         cmd->orig_iov_data_count = iov_count;
1001         return 0;
1002 }
1003
1004 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1005                           unsigned char *buf)
1006 {
1007         int data_direction, payload_length;
1008         struct iscsi_ecdb_ahdr *ecdb_ahdr;
1009         struct iscsi_scsi_req *hdr;
1010         int iscsi_task_attr;
1011         unsigned char *cdb;
1012         int sam_task_attr;
1013
1014         atomic_long_inc(&conn->sess->cmd_pdus);
1015
1016         hdr                     = (struct iscsi_scsi_req *) buf;
1017         payload_length          = ntoh24(hdr->dlength);
1018
1019         /* FIXME; Add checks for AdditionalHeaderSegment */
1020
1021         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1022             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1023                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1024                                 " not set. Bad iSCSI Initiator.\n");
1025                 return iscsit_add_reject_cmd(cmd,
1026                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1027         }
1028
1029         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1030              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1031                 /*
1032                  * From RFC-3720 Section 10.3.1:
1033                  *
1034                  * "Either or both of R and W MAY be 1 when either the
1035                  *  Expected Data Transfer Length and/or Bidirectional Read
1036                  *  Expected Data Transfer Length are 0"
1037                  *
1038                  * For this case, go ahead and clear the unnecssary bits
1039                  * to avoid any confusion with ->data_direction.
1040                  */
1041                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1042                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1043
1044                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1045                         " set when Expected Data Transfer Length is 0 for"
1046                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1047         }
1048
1049         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1050             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1051                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1052                         " MUST be set if Expected Data Transfer Length is not 0."
1053                         " Bad iSCSI Initiator\n");
1054                 return iscsit_add_reject_cmd(cmd,
1055                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1056         }
1057
1058         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1059             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1060                 pr_err("Bidirectional operations not supported!\n");
1061                 return iscsit_add_reject_cmd(cmd,
1062                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1063         }
1064
1065         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1066                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1067                                 " Scsi Command PDU.\n");
1068                 return iscsit_add_reject_cmd(cmd,
1069                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1070         }
1071
1072         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1073                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1074                         " protocol error.\n", payload_length);
1075                 return iscsit_add_reject_cmd(cmd,
1076                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1077         }
1078
1079         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1080             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1081                 pr_err("Expected Data Transfer Length and Length of"
1082                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1083                         " bit is not set protocol error\n");
1084                 return iscsit_add_reject_cmd(cmd,
1085                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1086         }
1087
1088         if (payload_length > be32_to_cpu(hdr->data_length)) {
1089                 pr_err("DataSegmentLength: %u is greater than"
1090                         " EDTL: %u, protocol error.\n", payload_length,
1091                                 hdr->data_length);
1092                 return iscsit_add_reject_cmd(cmd,
1093                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1094         }
1095
1096         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1097                 pr_err("DataSegmentLength: %u is greater than"
1098                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1099                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1100                 return iscsit_add_reject_cmd(cmd,
1101                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1102         }
1103
1104         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1105                 pr_err("DataSegmentLength: %u is greater than"
1106                         " FirstBurstLength: %u, protocol error.\n",
1107                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1108                 return iscsit_add_reject_cmd(cmd,
1109                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1110         }
1111
1112         cdb = hdr->cdb;
1113
1114         if (hdr->hlength) {
1115                 ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1);
1116                 if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) {
1117                         pr_err("Additional Header Segment type %d not supported!\n",
1118                                ecdb_ahdr->ahstype);
1119                         return iscsit_add_reject_cmd(cmd,
1120                                 ISCSI_REASON_CMD_NOT_SUPPORTED, buf);
1121                 }
1122
1123                 cdb = kmalloc(be16_to_cpu(ecdb_ahdr->ahslength) + 15,
1124                               GFP_KERNEL);
1125                 if (cdb == NULL)
1126                         return iscsit_add_reject_cmd(cmd,
1127                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1128                 memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE);
1129                 memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb,
1130                        be16_to_cpu(ecdb_ahdr->ahslength) - 1);
1131         }
1132
1133         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1134                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1135                           DMA_NONE;
1136
1137         cmd->data_direction = data_direction;
1138         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1139         /*
1140          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1141          */
1142         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1143             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1144                 sam_task_attr = TCM_SIMPLE_TAG;
1145         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1146                 sam_task_attr = TCM_ORDERED_TAG;
1147         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1148                 sam_task_attr = TCM_HEAD_TAG;
1149         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1150                 sam_task_attr = TCM_ACA_TAG;
1151         else {
1152                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1153                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1154                 sam_task_attr = TCM_SIMPLE_TAG;
1155         }
1156
1157         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1158         cmd->i_state            = ISTATE_NEW_CMD;
1159         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1160         cmd->immediate_data     = (payload_length) ? 1 : 0;
1161         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1162                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1163         if (cmd->unsolicited_data)
1164                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1165
1166         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1167         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1168                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1169         else
1170                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1171         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1172         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1173         cmd->first_burst_len    = payload_length;
1174
1175         if (!conn->sess->sess_ops->RDMAExtensions &&
1176              cmd->data_direction == DMA_FROM_DEVICE) {
1177                 struct iscsi_datain_req *dr;
1178
1179                 dr = iscsit_allocate_datain_req();
1180                 if (!dr) {
1181                         if (cdb != hdr->cdb)
1182                                 kfree(cdb);
1183                         return iscsit_add_reject_cmd(cmd,
1184                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1185                 }
1186
1187                 iscsit_attach_datain_req(cmd, dr);
1188         }
1189
1190         /*
1191          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1192          */
1193         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1194                           conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1195                           cmd->data_direction, sam_task_attr,
1196                           cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun),
1197                           conn->cmd_cnt);
1198
1199         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1200                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1201                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1202                 conn->cid);
1203
1204         target_get_sess_cmd(&cmd->se_cmd, true);
1205
1206         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1207         cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, cdb,
1208                                                 GFP_KERNEL);
1209
1210         if (cdb != hdr->cdb)
1211                 kfree(cdb);
1212
1213         if (cmd->sense_reason) {
1214                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1215                         return iscsit_add_reject_cmd(cmd,
1216                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1217                 }
1218
1219                 goto attach_cmd;
1220         }
1221
1222         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1223         if (cmd->sense_reason)
1224                 goto attach_cmd;
1225
1226         cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1227         if (cmd->sense_reason)
1228                 goto attach_cmd;
1229
1230         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1231                 return iscsit_add_reject_cmd(cmd,
1232                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1233         }
1234
1235 attach_cmd:
1236         spin_lock_bh(&conn->cmd_lock);
1237         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1238         spin_unlock_bh(&conn->cmd_lock);
1239         /*
1240          * Check if we need to delay processing because of ALUA
1241          * Active/NonOptimized primary access state..
1242          */
1243         core_alua_check_nonop_delay(&cmd->se_cmd);
1244
1245         return 0;
1246 }
1247 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1248
1249 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd)
1250 {
1251         iscsit_set_dataout_sequence_values(cmd);
1252
1253         spin_lock_bh(&cmd->dataout_timeout_lock);
1254         iscsit_start_dataout_timer(cmd, cmd->conn);
1255         spin_unlock_bh(&cmd->dataout_timeout_lock);
1256 }
1257 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1258
1259 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1260                             struct iscsi_scsi_req *hdr)
1261 {
1262         int cmdsn_ret = 0;
1263         /*
1264          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1265          * the Immediate Bit is not set, and no Immediate
1266          * Data is attached.
1267          *
1268          * A PDU/CmdSN carrying Immediate Data can only
1269          * be processed after the DataCRC has passed.
1270          * If the DataCRC fails, the CmdSN MUST NOT
1271          * be acknowledged. (See below)
1272          */
1273         if (!cmd->immediate_data) {
1274                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1275                                         (unsigned char *)hdr, hdr->cmdsn);
1276                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1277                         return -1;
1278                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1279                         target_put_sess_cmd(&cmd->se_cmd);
1280                         return 0;
1281                 }
1282         }
1283
1284         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1285
1286         /*
1287          * If no Immediate Data is attached, it's OK to return now.
1288          */
1289         if (!cmd->immediate_data) {
1290                 if (!cmd->sense_reason && cmd->unsolicited_data)
1291                         iscsit_set_unsolicited_dataout(cmd);
1292                 if (!cmd->sense_reason)
1293                         return 0;
1294
1295                 target_put_sess_cmd(&cmd->se_cmd);
1296                 return 0;
1297         }
1298
1299         /*
1300          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1301          * execution.  These exceptions are processed in CmdSN order using
1302          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1303          */
1304         if (cmd->sense_reason)
1305                 return 1;
1306         /*
1307          * Call directly into transport_generic_new_cmd() to perform
1308          * the backend memory allocation.
1309          */
1310         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1311         if (cmd->sense_reason)
1312                 return 1;
1313
1314         return 0;
1315 }
1316 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1317
1318 static int
1319 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr,
1320                           bool dump_payload)
1321 {
1322         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1323         int rc;
1324
1325         /*
1326          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1327          */
1328         if (dump_payload) {
1329                 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1330                                  cmd->first_burst_len);
1331
1332                 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1333                          cmd->se_cmd.data_length, cmd->write_data_done,
1334                          cmd->first_burst_len, length);
1335                 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1336                 pr_debug("Finished dumping immediate data\n");
1337                 if (rc < 0)
1338                         immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1339         } else {
1340                 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1341                                                          cmd->first_burst_len);
1342         }
1343
1344         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1345                 /*
1346                  * A PDU/CmdSN carrying Immediate Data passed
1347                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1348                  * Immediate Bit is not set.
1349                  */
1350                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1351                                         (unsigned char *)hdr, hdr->cmdsn);
1352                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1353                         return -1;
1354
1355                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1356                         target_put_sess_cmd(&cmd->se_cmd);
1357
1358                         return 0;
1359                 } else if (cmd->unsolicited_data)
1360                         iscsit_set_unsolicited_dataout(cmd);
1361
1362         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1363                 /*
1364                  * Immediate Data failed DataCRC and ERL>=1,
1365                  * silently drop this PDU and let the initiator
1366                  * plug the CmdSN gap.
1367                  *
1368                  * FIXME: Send Unsolicited NOPIN with reserved
1369                  * TTT here to help the initiator figure out
1370                  * the missing CmdSN, although they should be
1371                  * intelligent enough to determine the missing
1372                  * CmdSN and issue a retry to plug the sequence.
1373                  */
1374                 cmd->i_state = ISTATE_REMOVE;
1375                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1376         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1377                 return -1;
1378
1379         return 0;
1380 }
1381
1382 static int
1383 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1384                            unsigned char *buf)
1385 {
1386         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1387         int rc, immed_data;
1388         bool dump_payload = false;
1389
1390         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1391         if (rc < 0)
1392                 return 0;
1393         /*
1394          * Allocation iovecs needed for struct socket operations for
1395          * traditional iSCSI block I/O.
1396          */
1397         if (iscsit_allocate_iovecs(cmd) < 0) {
1398                 return iscsit_reject_cmd(cmd,
1399                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1400         }
1401         immed_data = cmd->immediate_data;
1402
1403         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1404         if (rc < 0)
1405                 return rc;
1406         else if (rc > 0)
1407                 dump_payload = true;
1408
1409         if (!immed_data)
1410                 return 0;
1411
1412         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1413 }
1414
1415 static u32 iscsit_do_crypto_hash_sg(
1416         struct ahash_request *hash,
1417         struct iscsit_cmd *cmd,
1418         u32 data_offset,
1419         u32 data_length,
1420         u32 padding,
1421         u8 *pad_bytes)
1422 {
1423         u32 data_crc;
1424         struct scatterlist *sg;
1425         unsigned int page_off;
1426
1427         crypto_ahash_init(hash);
1428
1429         sg = cmd->first_data_sg;
1430         page_off = cmd->first_data_sg_off;
1431
1432         if (data_length && page_off) {
1433                 struct scatterlist first_sg;
1434                 u32 len = min_t(u32, data_length, sg->length - page_off);
1435
1436                 sg_init_table(&first_sg, 1);
1437                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1438
1439                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1440                 crypto_ahash_update(hash);
1441
1442                 data_length -= len;
1443                 sg = sg_next(sg);
1444         }
1445
1446         while (data_length) {
1447                 u32 cur_len = min_t(u32, data_length, sg->length);
1448
1449                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1450                 crypto_ahash_update(hash);
1451
1452                 data_length -= cur_len;
1453                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1454                 sg = sg_next(sg);
1455         }
1456
1457         if (padding) {
1458                 struct scatterlist pad_sg;
1459
1460                 sg_init_one(&pad_sg, pad_bytes, padding);
1461                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1462                                         padding);
1463                 crypto_ahash_finup(hash);
1464         } else {
1465                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1466                 crypto_ahash_final(hash);
1467         }
1468
1469         return data_crc;
1470 }
1471
1472 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1473         const void *buf, u32 payload_length, u32 padding,
1474         const void *pad_bytes, void *data_crc)
1475 {
1476         struct scatterlist sg[2];
1477
1478         sg_init_table(sg, ARRAY_SIZE(sg));
1479         sg_set_buf(sg, buf, payload_length);
1480         if (padding)
1481                 sg_set_buf(sg + 1, pad_bytes, padding);
1482
1483         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1484
1485         crypto_ahash_digest(hash);
1486 }
1487
1488 int
1489 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1490                            struct iscsit_cmd *cmd, u32 payload_length,
1491                            bool *success)
1492 {
1493         struct iscsi_data *hdr = buf;
1494         struct se_cmd *se_cmd;
1495         int rc;
1496
1497         /* iSCSI write */
1498         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1499
1500         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1501                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1502                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1503                 payload_length, conn->cid);
1504
1505         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1506                 pr_err("Command ITT: 0x%08x received DataOUT after"
1507                         " last DataOUT received, dumping payload\n",
1508                         cmd->init_task_tag);
1509                 return iscsit_dump_data_payload(conn, payload_length, 1);
1510         }
1511
1512         if (cmd->data_direction != DMA_TO_DEVICE) {
1513                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1514                         " NON-WRITE command.\n", cmd->init_task_tag);
1515                 return iscsit_dump_data_payload(conn, payload_length, 1);
1516         }
1517         se_cmd = &cmd->se_cmd;
1518         iscsit_mod_dataout_timer(cmd);
1519
1520         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1521                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1522                        be32_to_cpu(hdr->offset), payload_length,
1523                        cmd->se_cmd.data_length);
1524                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1525         }
1526
1527         if (cmd->unsolicited_data) {
1528                 int dump_unsolicited_data = 0;
1529
1530                 if (conn->sess->sess_ops->InitialR2T) {
1531                         pr_err("Received unexpected unsolicited data"
1532                                 " while InitialR2T=Yes, protocol error.\n");
1533                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1534                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1535                         return -1;
1536                 }
1537                 /*
1538                  * Special case for dealing with Unsolicited DataOUT
1539                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1540                  * failures;
1541                  */
1542
1543                 /* Something's amiss if we're not in WRITE_PENDING state... */
1544                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1545                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1546                         dump_unsolicited_data = 1;
1547
1548                 if (dump_unsolicited_data) {
1549                         /*
1550                          * Check if a delayed TASK_ABORTED status needs to
1551                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1552                          * received with the unsolicited data out.
1553                          */
1554                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1555                                 iscsit_stop_dataout_timer(cmd);
1556
1557                         return iscsit_dump_data_payload(conn, payload_length, 1);
1558                 }
1559         } else {
1560                 /*
1561                  * For the normal solicited data path:
1562                  *
1563                  * Check for a delayed TASK_ABORTED status and dump any
1564                  * incoming data out payload if one exists.  Also, when the
1565                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1566                  * data out sequence, we decrement outstanding_r2ts.  Once
1567                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1568                  * TASK_ABORTED status.
1569                  */
1570                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1571                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1572                             --cmd->outstanding_r2ts < 1)
1573                                 iscsit_stop_dataout_timer(cmd);
1574
1575                         return iscsit_dump_data_payload(conn, payload_length, 1);
1576                 }
1577         }
1578         /*
1579          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1580          * within-command recovery checks before receiving the payload.
1581          */
1582         rc = iscsit_check_pre_dataout(cmd, buf);
1583         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1584                 return 0;
1585         else if (rc == DATAOUT_CANNOT_RECOVER)
1586                 return -1;
1587         *success = true;
1588         return 0;
1589 }
1590 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1591
1592 int
1593 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf,
1594                          struct iscsit_cmd **out_cmd)
1595 {
1596         struct iscsi_data *hdr = buf;
1597         struct iscsit_cmd *cmd;
1598         u32 payload_length = ntoh24(hdr->dlength);
1599         int rc;
1600         bool success = false;
1601
1602         if (!payload_length) {
1603                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1604                 return 0;
1605         }
1606
1607         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1608                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1609                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1610                         conn->conn_ops->MaxXmitDataSegmentLength);
1611                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1612         }
1613
1614         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1615         if (!cmd)
1616                 return 0;
1617
1618         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1619
1620         if (success)
1621                 *out_cmd = cmd;
1622
1623         return rc;
1624 }
1625 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1626
1627 static int
1628 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1629                    struct iscsi_data *hdr)
1630 {
1631         struct kvec *iov;
1632         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1633         u32 payload_length;
1634         int iov_ret, data_crc_failed = 0;
1635
1636         payload_length = min_t(u32, cmd->se_cmd.data_length,
1637                                ntoh24(hdr->dlength));
1638         rx_size += payload_length;
1639         iov = &cmd->iov_data[0];
1640
1641         iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1642                                    be32_to_cpu(hdr->offset), payload_length);
1643         if (iov_ret < 0)
1644                 return -1;
1645
1646         iov_count += iov_ret;
1647
1648         padding = ((-payload_length) & 3);
1649         if (padding != 0) {
1650                 iov[iov_count].iov_base = cmd->pad_bytes;
1651                 iov[iov_count++].iov_len = padding;
1652                 rx_size += padding;
1653                 pr_debug("Receiving %u padding bytes.\n", padding);
1654         }
1655
1656         if (conn->conn_ops->DataDigest) {
1657                 iov[iov_count].iov_base = &checksum;
1658                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1659                 rx_size += ISCSI_CRC_LEN;
1660         }
1661
1662         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1663         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1664
1665         iscsit_unmap_iovec(cmd);
1666
1667         if (rx_got != rx_size)
1668                 return -1;
1669
1670         if (conn->conn_ops->DataDigest) {
1671                 u32 data_crc;
1672
1673                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1674                                                     be32_to_cpu(hdr->offset),
1675                                                     payload_length, padding,
1676                                                     cmd->pad_bytes);
1677
1678                 if (checksum != data_crc) {
1679                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1680                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1681                                 " does not match computed 0x%08x\n",
1682                                 hdr->itt, hdr->offset, payload_length,
1683                                 hdr->datasn, checksum, data_crc);
1684                         data_crc_failed = 1;
1685                 } else {
1686                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1687                                 " %u bytes of Data Out\n", checksum,
1688                                 payload_length);
1689                 }
1690         }
1691
1692         return data_crc_failed;
1693 }
1694
1695 int
1696 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr,
1697                              bool data_crc_failed)
1698 {
1699         struct iscsit_conn *conn = cmd->conn;
1700         int rc, ooo_cmdsn;
1701         /*
1702          * Increment post receive data and CRC values or perform
1703          * within-command recovery.
1704          */
1705         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1706         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1707                 return 0;
1708         else if (rc == DATAOUT_SEND_R2T) {
1709                 iscsit_set_dataout_sequence_values(cmd);
1710                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1711         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1712                 /*
1713                  * Handle extra special case for out of order
1714                  * Unsolicited Data Out.
1715                  */
1716                 spin_lock_bh(&cmd->istate_lock);
1717                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1718                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1719                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1720                 spin_unlock_bh(&cmd->istate_lock);
1721
1722                 iscsit_stop_dataout_timer(cmd);
1723                 if (ooo_cmdsn)
1724                         return 0;
1725                 target_execute_cmd(&cmd->se_cmd);
1726                 return 0;
1727         } else /* DATAOUT_CANNOT_RECOVER */
1728                 return -1;
1729
1730         return 0;
1731 }
1732 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1733
1734 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf)
1735 {
1736         struct iscsit_cmd *cmd = NULL;
1737         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1738         int rc;
1739         bool data_crc_failed = false;
1740
1741         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1742         if (rc < 0)
1743                 return 0;
1744         else if (!cmd)
1745                 return 0;
1746
1747         rc = iscsit_get_dataout(conn, cmd, hdr);
1748         if (rc < 0)
1749                 return rc;
1750         else if (rc > 0)
1751                 data_crc_failed = true;
1752
1753         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1754 }
1755
1756 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1757                          struct iscsi_nopout *hdr)
1758 {
1759         u32 payload_length = ntoh24(hdr->dlength);
1760
1761         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1762                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1763                 if (!cmd)
1764                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1765                                                  (unsigned char *)hdr);
1766
1767                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1768                                          (unsigned char *)hdr);
1769         }
1770
1771         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1772                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1773                         " not set, protocol error.\n");
1774                 if (!cmd)
1775                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1776                                                  (unsigned char *)hdr);
1777
1778                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1779                                          (unsigned char *)hdr);
1780         }
1781
1782         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1783                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1784                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1785                         " error.\n", payload_length,
1786                         conn->conn_ops->MaxXmitDataSegmentLength);
1787                 if (!cmd)
1788                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1789                                                  (unsigned char *)hdr);
1790
1791                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1792                                          (unsigned char *)hdr);
1793         }
1794
1795         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1796                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1797                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1798                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1799                 payload_length);
1800         /*
1801          * This is not a response to a Unsolicited NopIN, which means
1802          * it can either be a NOPOUT ping request (with a valid ITT),
1803          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1804          * Either way, make sure we allocate an struct iscsit_cmd, as both
1805          * can contain ping data.
1806          */
1807         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1808                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1809                 cmd->i_state            = ISTATE_SEND_NOPIN;
1810                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1811                                                 1 : 0);
1812                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1813                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1814                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1815                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1816                 cmd->data_direction     = DMA_NONE;
1817         }
1818
1819         return 0;
1820 }
1821 EXPORT_SYMBOL(iscsit_setup_nop_out);
1822
1823 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1824                            struct iscsi_nopout *hdr)
1825 {
1826         struct iscsit_cmd *cmd_p = NULL;
1827         int cmdsn_ret = 0;
1828         /*
1829          * Initiator is expecting a NopIN ping reply..
1830          */
1831         if (hdr->itt != RESERVED_ITT) {
1832                 if (!cmd)
1833                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1834                                                 (unsigned char *)hdr);
1835
1836                 spin_lock_bh(&conn->cmd_lock);
1837                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1838                 spin_unlock_bh(&conn->cmd_lock);
1839
1840                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1841
1842                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1843                         iscsit_add_cmd_to_response_queue(cmd, conn,
1844                                                          cmd->i_state);
1845                         return 0;
1846                 }
1847
1848                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1849                                 (unsigned char *)hdr, hdr->cmdsn);
1850                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1851                         return 0;
1852                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1853                         return -1;
1854
1855                 return 0;
1856         }
1857         /*
1858          * This was a response to a unsolicited NOPIN ping.
1859          */
1860         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1861                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1862                 if (!cmd_p)
1863                         return -EINVAL;
1864
1865                 iscsit_stop_nopin_response_timer(conn);
1866
1867                 cmd_p->i_state = ISTATE_REMOVE;
1868                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1869
1870                 iscsit_start_nopin_timer(conn);
1871                 return 0;
1872         }
1873         /*
1874          * Otherwise, initiator is not expecting a NOPIN is response.
1875          * Just ignore for now.
1876          */
1877
1878         if (cmd)
1879                 iscsit_free_cmd(cmd, false);
1880
1881         return 0;
1882 }
1883 EXPORT_SYMBOL(iscsit_process_nop_out);
1884
1885 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
1886                                  unsigned char *buf)
1887 {
1888         unsigned char *ping_data = NULL;
1889         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1890         struct kvec *iov = NULL;
1891         u32 payload_length = ntoh24(hdr->dlength);
1892         int ret;
1893
1894         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1895         if (ret < 0)
1896                 return 0;
1897         /*
1898          * Handle NOP-OUT payload for traditional iSCSI sockets
1899          */
1900         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1901                 u32 checksum, data_crc, padding = 0;
1902                 int niov = 0, rx_got, rx_size = payload_length;
1903
1904                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1905                 if (!ping_data) {
1906                         ret = -1;
1907                         goto out;
1908                 }
1909
1910                 iov = &cmd->iov_misc[0];
1911                 iov[niov].iov_base      = ping_data;
1912                 iov[niov++].iov_len     = payload_length;
1913
1914                 padding = ((-payload_length) & 3);
1915                 if (padding != 0) {
1916                         pr_debug("Receiving %u additional bytes"
1917                                 " for padding.\n", padding);
1918                         iov[niov].iov_base      = &cmd->pad_bytes;
1919                         iov[niov++].iov_len     = padding;
1920                         rx_size += padding;
1921                 }
1922                 if (conn->conn_ops->DataDigest) {
1923                         iov[niov].iov_base      = &checksum;
1924                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1925                         rx_size += ISCSI_CRC_LEN;
1926                 }
1927
1928                 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1929                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1930                 if (rx_got != rx_size) {
1931                         ret = -1;
1932                         goto out;
1933                 }
1934
1935                 if (conn->conn_ops->DataDigest) {
1936                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1937                                                   payload_length, padding,
1938                                                   cmd->pad_bytes, &data_crc);
1939
1940                         if (checksum != data_crc) {
1941                                 pr_err("Ping data CRC32C DataDigest"
1942                                 " 0x%08x does not match computed 0x%08x\n",
1943                                         checksum, data_crc);
1944                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1945                                         pr_err("Unable to recover from"
1946                                         " NOPOUT Ping DataCRC failure while in"
1947                                                 " ERL=0.\n");
1948                                         ret = -1;
1949                                         goto out;
1950                                 } else {
1951                                         /*
1952                                          * Silently drop this PDU and let the
1953                                          * initiator plug the CmdSN gap.
1954                                          */
1955                                         pr_debug("Dropping NOPOUT"
1956                                         " Command CmdSN: 0x%08x due to"
1957                                         " DataCRC error.\n", hdr->cmdsn);
1958                                         ret = 0;
1959                                         goto out;
1960                                 }
1961                         } else {
1962                                 pr_debug("Got CRC32C DataDigest"
1963                                 " 0x%08x for %u bytes of ping data.\n",
1964                                         checksum, payload_length);
1965                         }
1966                 }
1967
1968                 ping_data[payload_length] = '\0';
1969                 /*
1970                  * Attach ping data to struct iscsit_cmd->buf_ptr.
1971                  */
1972                 cmd->buf_ptr = ping_data;
1973                 cmd->buf_ptr_size = payload_length;
1974
1975                 pr_debug("Got %u bytes of NOPOUT ping"
1976                         " data.\n", payload_length);
1977                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1978         }
1979
1980         return iscsit_process_nop_out(conn, cmd, hdr);
1981 out:
1982         if (cmd)
1983                 iscsit_free_cmd(cmd, false);
1984
1985         kfree(ping_data);
1986         return ret;
1987 }
1988
1989 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1990 {
1991         switch (iscsi_tmf) {
1992         case ISCSI_TM_FUNC_ABORT_TASK:
1993                 return TMR_ABORT_TASK;
1994         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1995                 return TMR_ABORT_TASK_SET;
1996         case ISCSI_TM_FUNC_CLEAR_ACA:
1997                 return TMR_CLEAR_ACA;
1998         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1999                 return TMR_CLEAR_TASK_SET;
2000         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2001                 return TMR_LUN_RESET;
2002         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2003                 return TMR_TARGET_WARM_RESET;
2004         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2005                 return TMR_TARGET_COLD_RESET;
2006         default:
2007                 return TMR_UNKNOWN;
2008         }
2009 }
2010
2011 int
2012 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2013                            unsigned char *buf)
2014 {
2015         struct se_tmr_req *se_tmr;
2016         struct iscsi_tmr_req *tmr_req;
2017         struct iscsi_tm *hdr;
2018         int out_of_order_cmdsn = 0, ret;
2019         u8 function, tcm_function = TMR_UNKNOWN;
2020
2021         hdr                     = (struct iscsi_tm *) buf;
2022         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2023         function = hdr->flags;
2024
2025         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
2026                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
2027                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
2028                 hdr->rtt, hdr->refcmdsn, conn->cid);
2029
2030         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2031             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2032              hdr->rtt != RESERVED_ITT)) {
2033                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
2034                 hdr->rtt = RESERVED_ITT;
2035         }
2036
2037         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
2038                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2039                 pr_err("Task Management Request TASK_REASSIGN not"
2040                         " issued as immediate command, bad iSCSI Initiator"
2041                                 "implementation\n");
2042                 return iscsit_add_reject_cmd(cmd,
2043                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
2044         }
2045         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2046             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2047                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2048
2049         cmd->data_direction = DMA_NONE;
2050         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2051         if (!cmd->tmr_req) {
2052                 return iscsit_add_reject_cmd(cmd,
2053                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2054                                              buf);
2055         }
2056
2057         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2058                           conn->sess->se_sess, 0, DMA_NONE,
2059                           TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2060                           scsilun_to_int(&hdr->lun),
2061                           conn->cmd_cnt);
2062
2063         target_get_sess_cmd(&cmd->se_cmd, true);
2064
2065         /*
2066          * TASK_REASSIGN for ERL=2 / connection stays inside of
2067          * LIO-Target $FABRIC_MOD
2068          */
2069         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2070                 tcm_function = iscsit_convert_tmf(function);
2071                 if (tcm_function == TMR_UNKNOWN) {
2072                         pr_err("Unknown iSCSI TMR Function:"
2073                                " 0x%02x\n", function);
2074                         return iscsit_add_reject_cmd(cmd,
2075                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2076                 }
2077         }
2078         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2079                                  GFP_KERNEL);
2080         if (ret < 0)
2081                 return iscsit_add_reject_cmd(cmd,
2082                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2083
2084         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2085
2086         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2087         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2088         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2089         cmd->init_task_tag      = hdr->itt;
2090         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2091         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2092         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2093         se_tmr                  = cmd->se_cmd.se_tmr_req;
2094         tmr_req                 = cmd->tmr_req;
2095         /*
2096          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2097          */
2098         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2099                 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2100                 if (ret < 0) {
2101                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2102                         goto attach;
2103                 }
2104         }
2105
2106         switch (function) {
2107         case ISCSI_TM_FUNC_ABORT_TASK:
2108                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2109                 if (se_tmr->response)
2110                         goto attach;
2111                 break;
2112         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2113         case ISCSI_TM_FUNC_CLEAR_ACA:
2114         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2115         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2116                 break;
2117         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2118                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2119                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2120                         goto attach;
2121                 }
2122                 break;
2123         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2124                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2125                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2126                         goto attach;
2127                 }
2128                 break;
2129         case ISCSI_TM_FUNC_TASK_REASSIGN:
2130                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2131                 /*
2132                  * Perform sanity checks on the ExpDataSN only if the
2133                  * TASK_REASSIGN was successful.
2134                  */
2135                 if (se_tmr->response)
2136                         break;
2137
2138                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2139                         return iscsit_add_reject_cmd(cmd,
2140                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2141                 break;
2142         default:
2143                 pr_err("Unknown TMR function: 0x%02x, protocol"
2144                         " error.\n", function);
2145                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2146                 goto attach;
2147         }
2148
2149         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2150             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2151                 se_tmr->call_transport = 1;
2152 attach:
2153         spin_lock_bh(&conn->cmd_lock);
2154         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2155         spin_unlock_bh(&conn->cmd_lock);
2156
2157         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2158                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2159                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2160                         out_of_order_cmdsn = 1;
2161                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2162                         target_put_sess_cmd(&cmd->se_cmd);
2163                         return 0;
2164                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2165                         return -1;
2166                 }
2167         }
2168         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2169
2170         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2171                 return 0;
2172         /*
2173          * Found the referenced task, send to transport for processing.
2174          */
2175         if (se_tmr->call_transport)
2176                 return transport_generic_handle_tmr(&cmd->se_cmd);
2177
2178         /*
2179          * Could not find the referenced LUN, task, or Task Management
2180          * command not authorized or supported.  Change state and
2181          * let the tx_thread send the response.
2182          *
2183          * For connection recovery, this is also the default action for
2184          * TMR TASK_REASSIGN.
2185          */
2186         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2187         target_put_sess_cmd(&cmd->se_cmd);
2188         return 0;
2189 }
2190 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2191
2192 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2193 int
2194 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2195                       struct iscsi_text *hdr)
2196 {
2197         u32 payload_length = ntoh24(hdr->dlength);
2198
2199         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2200                 pr_err("Unable to accept text parameter length: %u"
2201                         "greater than MaxXmitDataSegmentLength %u.\n",
2202                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2203                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2204                                          (unsigned char *)hdr);
2205         }
2206
2207         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2208              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2209                 pr_err("Multi sequence text commands currently not supported\n");
2210                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2211                                         (unsigned char *)hdr);
2212         }
2213
2214         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2215                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2216                 hdr->exp_statsn, payload_length);
2217
2218         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2219         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2220         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2221         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2222         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2223         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2224         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2225         cmd->data_direction     = DMA_NONE;
2226         kfree(cmd->text_in_ptr);
2227         cmd->text_in_ptr        = NULL;
2228
2229         return 0;
2230 }
2231 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2232
2233 int
2234 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2235                         struct iscsi_text *hdr)
2236 {
2237         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2238         int cmdsn_ret;
2239
2240         if (!text_in) {
2241                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2242                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2243                         pr_err("Unable to locate text_in buffer for sendtargets"
2244                                " discovery\n");
2245                         goto reject;
2246                 }
2247                 goto empty_sendtargets;
2248         }
2249         if (strncmp("SendTargets=", text_in, 12) != 0) {
2250                 pr_err("Received Text Data that is not"
2251                         " SendTargets, cannot continue.\n");
2252                 goto reject;
2253         }
2254         /* '=' confirmed in strncmp */
2255         text_ptr = strchr(text_in, '=');
2256         BUG_ON(!text_ptr);
2257         if (!strncmp("=All", text_ptr, 5)) {
2258                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2259         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2260                    !strncmp("=eui.", text_ptr, 5)) {
2261                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2262         } else {
2263                 pr_err("Unable to locate valid SendTargets%s value\n",
2264                        text_ptr);
2265                 goto reject;
2266         }
2267
2268         spin_lock_bh(&conn->cmd_lock);
2269         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2270         spin_unlock_bh(&conn->cmd_lock);
2271
2272 empty_sendtargets:
2273         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2274
2275         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2276                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2277                                 (unsigned char *)hdr, hdr->cmdsn);
2278                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2279                         return -1;
2280
2281                 return 0;
2282         }
2283
2284         return iscsit_execute_cmd(cmd, 0);
2285
2286 reject:
2287         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2288                                  (unsigned char *)hdr);
2289 }
2290 EXPORT_SYMBOL(iscsit_process_text_cmd);
2291
2292 static int
2293 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2294                        unsigned char *buf)
2295 {
2296         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2297         char *text_in = NULL;
2298         u32 payload_length = ntoh24(hdr->dlength);
2299         int rx_size, rc;
2300
2301         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2302         if (rc < 0)
2303                 return 0;
2304
2305         rx_size = payload_length;
2306         if (payload_length) {
2307                 u32 checksum = 0, data_crc = 0;
2308                 u32 padding = 0;
2309                 int niov = 0, rx_got;
2310                 struct kvec iov[2];
2311
2312                 rx_size = ALIGN(payload_length, 4);
2313                 text_in = kzalloc(rx_size, GFP_KERNEL);
2314                 if (!text_in)
2315                         goto reject;
2316
2317                 cmd->text_in_ptr = text_in;
2318
2319                 memset(iov, 0, sizeof(iov));
2320                 iov[niov].iov_base      = text_in;
2321                 iov[niov++].iov_len     = rx_size;
2322
2323                 padding = rx_size - payload_length;
2324                 if (padding)
2325                         pr_debug("Receiving %u additional bytes"
2326                                         " for padding.\n", padding);
2327                 if (conn->conn_ops->DataDigest) {
2328                         iov[niov].iov_base      = &checksum;
2329                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2330                         rx_size += ISCSI_CRC_LEN;
2331                 }
2332
2333                 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2334                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2335                 if (rx_got != rx_size)
2336                         goto reject;
2337
2338                 if (conn->conn_ops->DataDigest) {
2339                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2340                                                   text_in, rx_size, 0, NULL,
2341                                                   &data_crc);
2342
2343                         if (checksum != data_crc) {
2344                                 pr_err("Text data CRC32C DataDigest"
2345                                         " 0x%08x does not match computed"
2346                                         " 0x%08x\n", checksum, data_crc);
2347                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2348                                         pr_err("Unable to recover from"
2349                                         " Text Data digest failure while in"
2350                                                 " ERL=0.\n");
2351                                         goto reject;
2352                                 } else {
2353                                         /*
2354                                          * Silently drop this PDU and let the
2355                                          * initiator plug the CmdSN gap.
2356                                          */
2357                                         pr_debug("Dropping Text"
2358                                         " Command CmdSN: 0x%08x due to"
2359                                         " DataCRC error.\n", hdr->cmdsn);
2360                                         kfree(text_in);
2361                                         return 0;
2362                                 }
2363                         } else {
2364                                 pr_debug("Got CRC32C DataDigest"
2365                                         " 0x%08x for %u bytes of text data.\n",
2366                                                 checksum, payload_length);
2367                         }
2368                 }
2369                 text_in[payload_length - 1] = '\0';
2370                 pr_debug("Successfully read %d bytes of text"
2371                                 " data.\n", payload_length);
2372         }
2373
2374         return iscsit_process_text_cmd(conn, cmd, hdr);
2375
2376 reject:
2377         kfree(cmd->text_in_ptr);
2378         cmd->text_in_ptr = NULL;
2379         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2380 }
2381
2382 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2383 {
2384         struct iscsit_conn *conn_p;
2385         struct iscsit_session *sess = conn->sess;
2386
2387         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2388                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2389
2390         atomic_set(&sess->session_logout, 1);
2391         atomic_set(&conn->conn_logout_remove, 1);
2392         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2393
2394         iscsit_inc_conn_usage_count(conn);
2395         iscsit_inc_session_usage_count(sess);
2396
2397         spin_lock_bh(&sess->conn_lock);
2398         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2399                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2400                         continue;
2401
2402                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2403                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2404         }
2405         spin_unlock_bh(&sess->conn_lock);
2406
2407         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2408
2409         return 0;
2410 }
2411
2412 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2413 {
2414         struct iscsit_conn *l_conn;
2415         struct iscsit_session *sess = conn->sess;
2416
2417         pr_debug("Received logout request CLOSECONNECTION for CID:"
2418                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2419
2420         /*
2421          * A Logout Request with a CLOSECONNECTION reason code for a CID
2422          * can arrive on a connection with a differing CID.
2423          */
2424         if (conn->cid == cmd->logout_cid) {
2425                 spin_lock_bh(&conn->state_lock);
2426                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2427                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2428
2429                 atomic_set(&conn->conn_logout_remove, 1);
2430                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2431                 iscsit_inc_conn_usage_count(conn);
2432
2433                 spin_unlock_bh(&conn->state_lock);
2434         } else {
2435                 /*
2436                  * Handle all different cid CLOSECONNECTION requests in
2437                  * iscsit_logout_post_handler_diffcid() as to give enough
2438                  * time for any non immediate command's CmdSN to be
2439                  * acknowledged on the connection in question.
2440                  *
2441                  * Here we simply make sure the CID is still around.
2442                  */
2443                 l_conn = iscsit_get_conn_from_cid(sess,
2444                                 cmd->logout_cid);
2445                 if (!l_conn) {
2446                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2447                         iscsit_add_cmd_to_response_queue(cmd, conn,
2448                                         cmd->i_state);
2449                         return 0;
2450                 }
2451
2452                 iscsit_dec_conn_usage_count(l_conn);
2453         }
2454
2455         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2456
2457         return 0;
2458 }
2459
2460 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2461 {
2462         struct iscsit_session *sess = conn->sess;
2463
2464         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2465                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2466
2467         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2468                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2469                         " while ERL!=2.\n");
2470                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2471                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2472                 return 0;
2473         }
2474
2475         if (conn->cid == cmd->logout_cid) {
2476                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2477                         " with CID: %hu on CID: %hu, implementation error.\n",
2478                                 cmd->logout_cid, conn->cid);
2479                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2480                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2481                 return 0;
2482         }
2483
2484         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2485
2486         return 0;
2487 }
2488
2489 int
2490 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
2491                         unsigned char *buf)
2492 {
2493         int cmdsn_ret, logout_remove = 0;
2494         u8 reason_code = 0;
2495         struct iscsi_logout *hdr;
2496         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2497
2498         hdr                     = (struct iscsi_logout *) buf;
2499         reason_code             = (hdr->flags & 0x7f);
2500
2501         if (tiqn) {
2502                 spin_lock(&tiqn->logout_stats.lock);
2503                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2504                         tiqn->logout_stats.normal_logouts++;
2505                 else
2506                         tiqn->logout_stats.abnormal_logouts++;
2507                 spin_unlock(&tiqn->logout_stats.lock);
2508         }
2509
2510         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2511                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2512                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2513                 hdr->cid, conn->cid);
2514
2515         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2516                 pr_err("Received logout request on connection that"
2517                         " is not in logged in state, ignoring request.\n");
2518                 iscsit_free_cmd(cmd, false);
2519                 return 0;
2520         }
2521
2522         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2523         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2524         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2525         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2526         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2527         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2528         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2529         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2530         cmd->logout_reason      = reason_code;
2531         cmd->data_direction     = DMA_NONE;
2532
2533         /*
2534          * We need to sleep in these cases (by returning 1) until the Logout
2535          * Response gets sent in the tx thread.
2536          */
2537         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2538            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2539             be16_to_cpu(hdr->cid) == conn->cid))
2540                 logout_remove = 1;
2541
2542         spin_lock_bh(&conn->cmd_lock);
2543         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2544         spin_unlock_bh(&conn->cmd_lock);
2545
2546         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2547                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2548
2549         /*
2550          * Immediate commands are executed, well, immediately.
2551          * Non-Immediate Logout Commands are executed in CmdSN order.
2552          */
2553         if (cmd->immediate_cmd) {
2554                 int ret = iscsit_execute_cmd(cmd, 0);
2555
2556                 if (ret < 0)
2557                         return ret;
2558         } else {
2559                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2560                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2561                         logout_remove = 0;
2562                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2563                         return -1;
2564         }
2565
2566         return logout_remove;
2567 }
2568 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2569
2570 int iscsit_handle_snack(
2571         struct iscsit_conn *conn,
2572         unsigned char *buf)
2573 {
2574         struct iscsi_snack *hdr;
2575
2576         hdr                     = (struct iscsi_snack *) buf;
2577         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2578
2579         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2580                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2581                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2582                         hdr->begrun, hdr->runlength, conn->cid);
2583
2584         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2585                 pr_err("Initiator sent SNACK request while in"
2586                         " ErrorRecoveryLevel=0.\n");
2587                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2588                                          buf);
2589         }
2590         /*
2591          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2592          * call from inside iscsi_send_recovery_datain_or_r2t().
2593          */
2594         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2595         case 0:
2596                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2597                         hdr->itt,
2598                         be32_to_cpu(hdr->ttt),
2599                         be32_to_cpu(hdr->begrun),
2600                         be32_to_cpu(hdr->runlength));
2601         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2602                 return iscsit_handle_status_snack(conn, hdr->itt,
2603                         be32_to_cpu(hdr->ttt),
2604                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2605         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2606                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2607                         be32_to_cpu(hdr->begrun),
2608                         be32_to_cpu(hdr->runlength));
2609         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2610                 /* FIXME: Support R-Data SNACK */
2611                 pr_err("R-Data SNACK Not Supported.\n");
2612                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2613                                          buf);
2614         default:
2615                 pr_err("Unknown SNACK type 0x%02x, protocol"
2616                         " error.\n", hdr->flags & 0x0f);
2617                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2618                                          buf);
2619         }
2620
2621         return 0;
2622 }
2623 EXPORT_SYMBOL(iscsit_handle_snack);
2624
2625 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn)
2626 {
2627         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2628             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2629                 wait_for_completion_interruptible_timeout(
2630                                         &conn->rx_half_close_comp,
2631                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2632         }
2633 }
2634
2635 static int iscsit_handle_immediate_data(
2636         struct iscsit_cmd *cmd,
2637         struct iscsi_scsi_req *hdr,
2638         u32 length)
2639 {
2640         int iov_ret, rx_got = 0, rx_size = 0;
2641         u32 checksum, iov_count = 0, padding = 0;
2642         struct iscsit_conn *conn = cmd->conn;
2643         struct kvec *iov;
2644         void *overflow_buf = NULL;
2645
2646         BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2647         rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2648         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2649                                    cmd->orig_iov_data_count - 2,
2650                                    cmd->write_data_done, rx_size);
2651         if (iov_ret < 0)
2652                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2653
2654         iov_count = iov_ret;
2655         iov = &cmd->iov_data[0];
2656         if (rx_size < length) {
2657                 /*
2658                  * Special case: length of immediate data exceeds the data
2659                  * buffer size derived from the CDB.
2660                  */
2661                 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2662                 if (!overflow_buf) {
2663                         iscsit_unmap_iovec(cmd);
2664                         return IMMEDIATE_DATA_CANNOT_RECOVER;
2665                 }
2666                 cmd->overflow_buf = overflow_buf;
2667                 iov[iov_count].iov_base = overflow_buf;
2668                 iov[iov_count].iov_len = length - rx_size;
2669                 iov_count++;
2670                 rx_size = length;
2671         }
2672
2673         padding = ((-length) & 3);
2674         if (padding != 0) {
2675                 iov[iov_count].iov_base = cmd->pad_bytes;
2676                 iov[iov_count++].iov_len = padding;
2677                 rx_size += padding;
2678         }
2679
2680         if (conn->conn_ops->DataDigest) {
2681                 iov[iov_count].iov_base         = &checksum;
2682                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2683                 rx_size += ISCSI_CRC_LEN;
2684         }
2685
2686         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2687         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2688
2689         iscsit_unmap_iovec(cmd);
2690
2691         if (rx_got != rx_size) {
2692                 iscsit_rx_thread_wait_for_tcp(conn);
2693                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2694         }
2695
2696         if (conn->conn_ops->DataDigest) {
2697                 u32 data_crc;
2698
2699                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2700                                                     cmd->write_data_done, length, padding,
2701                                                     cmd->pad_bytes);
2702
2703                 if (checksum != data_crc) {
2704                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2705                                 " does not match computed 0x%08x\n", checksum,
2706                                 data_crc);
2707
2708                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2709                                 pr_err("Unable to recover from"
2710                                         " Immediate Data digest failure while"
2711                                         " in ERL=0.\n");
2712                                 iscsit_reject_cmd(cmd,
2713                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2714                                                 (unsigned char *)hdr);
2715                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2716                         } else {
2717                                 iscsit_reject_cmd(cmd,
2718                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2719                                                 (unsigned char *)hdr);
2720                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2721                         }
2722                 } else {
2723                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2724                                 " %u bytes of Immediate Data\n", checksum,
2725                                 length);
2726                 }
2727         }
2728
2729         cmd->write_data_done += length;
2730
2731         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2732                 spin_lock_bh(&cmd->istate_lock);
2733                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2734                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2735                 spin_unlock_bh(&cmd->istate_lock);
2736         }
2737
2738         return IMMEDIATE_DATA_NORMAL_OPERATION;
2739 }
2740
2741 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2742         with active network interface */
2743 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn)
2744 {
2745         struct iscsit_cmd *cmd;
2746         struct iscsit_conn *conn_p;
2747         bool found = false;
2748
2749         lockdep_assert_held(&conn->sess->conn_lock);
2750
2751         /*
2752          * Only send a Asynchronous Message on connections whos network
2753          * interface is still functional.
2754          */
2755         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2756                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2757                         iscsit_inc_conn_usage_count(conn_p);
2758                         found = true;
2759                         break;
2760                 }
2761         }
2762
2763         if (!found)
2764                 return;
2765
2766         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2767         if (!cmd) {
2768                 iscsit_dec_conn_usage_count(conn_p);
2769                 return;
2770         }
2771
2772         cmd->logout_cid = conn->cid;
2773         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2774         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2775
2776         spin_lock_bh(&conn_p->cmd_lock);
2777         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2778         spin_unlock_bh(&conn_p->cmd_lock);
2779
2780         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2781         iscsit_dec_conn_usage_count(conn_p);
2782 }
2783
2784 static int iscsit_send_conn_drop_async_message(
2785         struct iscsit_cmd *cmd,
2786         struct iscsit_conn *conn)
2787 {
2788         struct iscsi_async *hdr;
2789
2790         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2791
2792         hdr                     = (struct iscsi_async *) cmd->pdu;
2793         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2794         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2795         cmd->init_task_tag      = RESERVED_ITT;
2796         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2797         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2798         cmd->stat_sn            = conn->stat_sn++;
2799         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2800         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2801         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2802         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2803         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2804         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2805         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2806
2807         pr_debug("Sending Connection Dropped Async Message StatSN:"
2808                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2809                         cmd->logout_cid, conn->cid);
2810
2811         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2812 }
2813
2814 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn)
2815 {
2816         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2817             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2818                 wait_for_completion_interruptible_timeout(
2819                                         &conn->tx_half_close_comp,
2820                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2821         }
2822 }
2823
2824 void
2825 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2826                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2827                         bool set_statsn)
2828 {
2829         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2830         hdr->flags              = datain->flags;
2831         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2832                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2833                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2834                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2835                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2836                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2837                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2838                 }
2839         }
2840         hton24(hdr->dlength, datain->length);
2841         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2842                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2843                                 (struct scsi_lun *)&hdr->lun);
2844         else
2845                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2846
2847         hdr->itt                = cmd->init_task_tag;
2848
2849         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2850                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2851         else
2852                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2853         if (set_statsn)
2854                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2855         else
2856                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2857
2858         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2859         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2860         hdr->datasn             = cpu_to_be32(datain->data_sn);
2861         hdr->offset             = cpu_to_be32(datain->offset);
2862
2863         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2864                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2865                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2866                 ntohl(hdr->offset), datain->length, conn->cid);
2867 }
2868 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2869
2870 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
2871 {
2872         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2873         struct iscsi_datain datain;
2874         struct iscsi_datain_req *dr;
2875         int eodr = 0, ret;
2876         bool set_statsn = false;
2877
2878         memset(&datain, 0, sizeof(struct iscsi_datain));
2879         dr = iscsit_get_datain_values(cmd, &datain);
2880         if (!dr) {
2881                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2882                                 cmd->init_task_tag);
2883                 return -1;
2884         }
2885         /*
2886          * Be paranoid and double check the logic for now.
2887          */
2888         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2889                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2890                         " datain.length: %u exceeds cmd->data_length: %u\n",
2891                         cmd->init_task_tag, datain.offset, datain.length,
2892                         cmd->se_cmd.data_length);
2893                 return -1;
2894         }
2895
2896         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2897         /*
2898          * Special case for successfully execution w/ both DATAIN
2899          * and Sense Data.
2900          */
2901         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2902             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2903                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2904         else {
2905                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2906                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2907                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2908                         cmd->stat_sn = conn->stat_sn++;
2909                         set_statsn = true;
2910                 } else if (dr->dr_complete ==
2911                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2912                         set_statsn = true;
2913         }
2914
2915         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2916
2917         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2918         if (ret < 0)
2919                 return ret;
2920
2921         if (dr->dr_complete) {
2922                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2923                                 2 : 1;
2924                 iscsit_free_datain_req(cmd, dr);
2925         }
2926
2927         return eodr;
2928 }
2929
2930 int
2931 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
2932                         struct iscsi_logout_rsp *hdr)
2933 {
2934         struct iscsit_conn *logout_conn = NULL;
2935         struct iscsi_conn_recovery *cr = NULL;
2936         struct iscsit_session *sess = conn->sess;
2937         /*
2938          * The actual shutting down of Sessions and/or Connections
2939          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2940          * is done in scsi_logout_post_handler().
2941          */
2942         switch (cmd->logout_reason) {
2943         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2944                 pr_debug("iSCSI session logout successful, setting"
2945                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2946                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2947                 break;
2948         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2949                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2950                         break;
2951                 /*
2952                  * For CLOSECONNECTION logout requests carrying
2953                  * a matching logout CID -> local CID, the reference
2954                  * for the local CID will have been incremented in
2955                  * iscsi_logout_closeconnection().
2956                  *
2957                  * For CLOSECONNECTION logout requests carrying
2958                  * a different CID than the connection it arrived
2959                  * on, the connection responding to cmd->logout_cid
2960                  * is stopped in iscsit_logout_post_handler_diffcid().
2961                  */
2962
2963                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2964                         " successful.\n", cmd->logout_cid, conn->cid);
2965                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2966                 break;
2967         case ISCSI_LOGOUT_REASON_RECOVERY:
2968                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2969                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2970                         break;
2971                 /*
2972                  * If the connection is still active from our point of view
2973                  * force connection recovery to occur.
2974                  */
2975                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2976                                 cmd->logout_cid);
2977                 if (logout_conn) {
2978                         iscsit_connection_reinstatement_rcfr(logout_conn);
2979                         iscsit_dec_conn_usage_count(logout_conn);
2980                 }
2981
2982                 cr = iscsit_get_inactive_connection_recovery_entry(
2983                                 conn->sess, cmd->logout_cid);
2984                 if (!cr) {
2985                         pr_err("Unable to locate CID: %hu for"
2986                         " REMOVECONNFORRECOVERY Logout Request.\n",
2987                                 cmd->logout_cid);
2988                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2989                         break;
2990                 }
2991
2992                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2993
2994                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2995                         " for recovery for CID: %hu on CID: %hu successful.\n",
2996                                 cmd->logout_cid, conn->cid);
2997                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2998                 break;
2999         default:
3000                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
3001                                 cmd->logout_reason);
3002                 return -1;
3003         }
3004
3005         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
3006         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3007         hdr->response           = cmd->logout_response;
3008         hdr->itt                = cmd->init_task_tag;
3009         cmd->stat_sn            = conn->stat_sn++;
3010         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3011
3012         iscsit_increment_maxcmdsn(cmd, conn->sess);
3013         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3014         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3015
3016         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
3017                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
3018                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
3019                 cmd->logout_cid, conn->cid);
3020
3021         return 0;
3022 }
3023 EXPORT_SYMBOL(iscsit_build_logout_rsp);
3024
3025 static int
3026 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3027 {
3028         int rc;
3029
3030         rc = iscsit_build_logout_rsp(cmd, conn,
3031                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
3032         if (rc < 0)
3033                 return rc;
3034
3035         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3036 }
3037
3038 void
3039 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3040                        struct iscsi_nopin *hdr, bool nopout_response)
3041 {
3042         hdr->opcode             = ISCSI_OP_NOOP_IN;
3043         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3044         hton24(hdr->dlength, cmd->buf_ptr_size);
3045         if (nopout_response)
3046                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3047         hdr->itt                = cmd->init_task_tag;
3048         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3049         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
3050                                   conn->stat_sn;
3051         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3052
3053         if (nopout_response)
3054                 iscsit_increment_maxcmdsn(cmd, conn->sess);
3055
3056         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3057         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3058
3059         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3060                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3061                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3062                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3063 }
3064 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3065
3066 /*
3067  *      Unsolicited NOPIN, either requesting a response or not.
3068  */
3069 static int iscsit_send_unsolicited_nopin(
3070         struct iscsit_cmd *cmd,
3071         struct iscsit_conn *conn,
3072         int want_response)
3073 {
3074         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3075         int ret;
3076
3077         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3078
3079         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3080                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3081
3082         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3083         if (ret < 0)
3084                 return ret;
3085
3086         spin_lock_bh(&cmd->istate_lock);
3087         cmd->i_state = want_response ?
3088                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3089         spin_unlock_bh(&cmd->istate_lock);
3090
3091         return 0;
3092 }
3093
3094 static int
3095 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3096 {
3097         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3098
3099         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3100
3101         /*
3102          * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr.
3103          * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size.
3104          */
3105         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3106
3107         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3108                                                      cmd->buf_ptr,
3109                                                      cmd->buf_ptr_size);
3110 }
3111
3112 static int iscsit_send_r2t(
3113         struct iscsit_cmd *cmd,
3114         struct iscsit_conn *conn)
3115 {
3116         struct iscsi_r2t *r2t;
3117         struct iscsi_r2t_rsp *hdr;
3118         int ret;
3119
3120         r2t = iscsit_get_r2t_from_list(cmd);
3121         if (!r2t)
3122                 return -1;
3123
3124         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3125         memset(hdr, 0, ISCSI_HDR_LEN);
3126         hdr->opcode             = ISCSI_OP_R2T;
3127         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3128         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3129                         (struct scsi_lun *)&hdr->lun);
3130         hdr->itt                = cmd->init_task_tag;
3131         if (conn->conn_transport->iscsit_get_r2t_ttt)
3132                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3133         else
3134                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3135         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3136         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3137         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3138         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3139         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3140         hdr->data_offset        = cpu_to_be32(r2t->offset);
3141         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3142
3143         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3144                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3145                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3146                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3147                         r2t->offset, r2t->xfer_len, conn->cid);
3148
3149         spin_lock_bh(&cmd->r2t_lock);
3150         r2t->sent_r2t = 1;
3151         spin_unlock_bh(&cmd->r2t_lock);
3152
3153         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3154         if (ret < 0) {
3155                 return ret;
3156         }
3157
3158         spin_lock_bh(&cmd->dataout_timeout_lock);
3159         iscsit_start_dataout_timer(cmd, conn);
3160         spin_unlock_bh(&cmd->dataout_timeout_lock);
3161
3162         return 0;
3163 }
3164
3165 /*
3166  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3167  *              connection recovery.
3168  */
3169 int iscsit_build_r2ts_for_cmd(
3170         struct iscsit_conn *conn,
3171         struct iscsit_cmd *cmd,
3172         bool recovery)
3173 {
3174         int first_r2t = 1;
3175         u32 offset = 0, xfer_len = 0;
3176
3177         spin_lock_bh(&cmd->r2t_lock);
3178         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3179                 spin_unlock_bh(&cmd->r2t_lock);
3180                 return 0;
3181         }
3182
3183         if (conn->sess->sess_ops->DataSequenceInOrder &&
3184             !recovery)
3185                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3186
3187         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3188                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3189                         offset = cmd->r2t_offset;
3190
3191                         if (first_r2t && recovery) {
3192                                 int new_data_end = offset +
3193                                         conn->sess->sess_ops->MaxBurstLength -
3194                                         cmd->next_burst_len;
3195
3196                                 if (new_data_end > cmd->se_cmd.data_length)
3197                                         xfer_len = cmd->se_cmd.data_length - offset;
3198                                 else
3199                                         xfer_len =
3200                                                 conn->sess->sess_ops->MaxBurstLength -
3201                                                 cmd->next_burst_len;
3202                         } else {
3203                                 int new_data_end = offset +
3204                                         conn->sess->sess_ops->MaxBurstLength;
3205
3206                                 if (new_data_end > cmd->se_cmd.data_length)
3207                                         xfer_len = cmd->se_cmd.data_length - offset;
3208                                 else
3209                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3210                         }
3211
3212                         if ((s32)xfer_len < 0) {
3213                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3214                                 break;
3215                         }
3216
3217                         cmd->r2t_offset += xfer_len;
3218
3219                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3220                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3221                 } else {
3222                         struct iscsi_seq *seq;
3223
3224                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3225                         if (!seq) {
3226                                 spin_unlock_bh(&cmd->r2t_lock);
3227                                 return -1;
3228                         }
3229
3230                         offset = seq->offset;
3231                         xfer_len = seq->xfer_len;
3232
3233                         if (cmd->seq_send_order == cmd->seq_count)
3234                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3235                 }
3236                 cmd->outstanding_r2ts++;
3237                 first_r2t = 0;
3238
3239                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3240                         spin_unlock_bh(&cmd->r2t_lock);
3241                         return -1;
3242                 }
3243
3244                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3245                         break;
3246         }
3247         spin_unlock_bh(&cmd->r2t_lock);
3248
3249         return 0;
3250 }
3251 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3252
3253 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3254                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3255 {
3256         if (inc_stat_sn)
3257                 cmd->stat_sn = conn->stat_sn++;
3258
3259         atomic_long_inc(&conn->sess->rsp_pdus);
3260
3261         memset(hdr, 0, ISCSI_HDR_LEN);
3262         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3263         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3264         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3265                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3266                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3267         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3268                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3269                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3270         }
3271         hdr->response           = cmd->iscsi_response;
3272         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3273         hdr->itt                = cmd->init_task_tag;
3274         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3275
3276         iscsit_increment_maxcmdsn(cmd, conn->sess);
3277         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3278         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3279
3280         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3281                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3282                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3283                 cmd->se_cmd.scsi_status, conn->cid);
3284 }
3285 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3286
3287 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3288 {
3289         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3290         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3291         void *data_buf = NULL;
3292         u32 padding = 0, data_buf_len = 0;
3293
3294         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3295
3296         /*
3297          * Attach SENSE DATA payload to iSCSI Response PDU
3298          */
3299         if (cmd->se_cmd.sense_buffer &&
3300            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3301             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3302                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3303                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3304
3305                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3306                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3307                 data_buf = cmd->sense_buffer;
3308                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3309
3310                 if (padding) {
3311                         memset(cmd->sense_buffer +
3312                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3313                         pr_debug("Adding %u bytes of padding to"
3314                                 " SENSE.\n", padding);
3315                 }
3316
3317                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3318                                 " Response PDU\n",
3319                                 cmd->se_cmd.scsi_sense_length);
3320         }
3321
3322         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3323                                                      data_buf_len);
3324 }
3325
3326 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3327 {
3328         switch (se_tmr->response) {
3329         case TMR_FUNCTION_COMPLETE:
3330                 return ISCSI_TMF_RSP_COMPLETE;
3331         case TMR_TASK_DOES_NOT_EXIST:
3332                 return ISCSI_TMF_RSP_NO_TASK;
3333         case TMR_LUN_DOES_NOT_EXIST:
3334                 return ISCSI_TMF_RSP_NO_LUN;
3335         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3336                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3337         case TMR_FUNCTION_REJECTED:
3338         default:
3339                 return ISCSI_TMF_RSP_REJECTED;
3340         }
3341 }
3342
3343 void
3344 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3345                           struct iscsi_tm_rsp *hdr)
3346 {
3347         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3348
3349         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3350         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3351         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3352         hdr->itt                = cmd->init_task_tag;
3353         cmd->stat_sn            = conn->stat_sn++;
3354         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3355
3356         iscsit_increment_maxcmdsn(cmd, conn->sess);
3357         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3358         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3359
3360         pr_debug("Built Task Management Response ITT: 0x%08x,"
3361                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3362                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3363 }
3364 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3365
3366 static int
3367 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
3368 {
3369         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3370
3371         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3372
3373         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3374 }
3375
3376 #define SENDTARGETS_BUF_LIMIT 32768U
3377
3378 static int
3379 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd,
3380                                   enum iscsit_transport_type network_transport,
3381                                   int skip_bytes, bool *completed)
3382 {
3383         char *payload = NULL;
3384         struct iscsit_conn *conn = cmd->conn;
3385         struct iscsi_portal_group *tpg;
3386         struct iscsi_tiqn *tiqn;
3387         struct iscsi_tpg_np *tpg_np;
3388         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3389         int target_name_printed;
3390         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3391         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3392         bool active;
3393
3394         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3395                          SENDTARGETS_BUF_LIMIT);
3396
3397         payload = kzalloc(buffer_len, GFP_KERNEL);
3398         if (!payload)
3399                 return -ENOMEM;
3400
3401         /*
3402          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3403          * explicit case..
3404          */
3405         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3406                 text_ptr = strchr(text_in, '=');
3407                 if (!text_ptr) {
3408                         pr_err("Unable to locate '=' string in text_in:"
3409                                " %s\n", text_in);
3410                         kfree(payload);
3411                         return -EINVAL;
3412                 }
3413                 /*
3414                  * Skip over '=' character..
3415                  */
3416                 text_ptr += 1;
3417         }
3418
3419         spin_lock(&tiqn_lock);
3420         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3421                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3422                      strcmp(tiqn->tiqn, text_ptr)) {
3423                         continue;
3424                 }
3425
3426                 target_name_printed = 0;
3427
3428                 spin_lock(&tiqn->tiqn_tpg_lock);
3429                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3430
3431                         /* If demo_mode_discovery=0 and generate_node_acls=0
3432                          * (demo mode dislabed) do not return
3433                          * TargetName+TargetAddress unless a NodeACL exists.
3434                          */
3435
3436                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3437                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3438                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3439                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3440                                 continue;
3441                         }
3442
3443                         spin_lock(&tpg->tpg_state_lock);
3444                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3445                         spin_unlock(&tpg->tpg_state_lock);
3446
3447                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3448                                 continue;
3449
3450                         spin_lock(&tpg->tpg_np_lock);
3451                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3452                                                 tpg_np_list) {
3453                                 struct iscsi_np *np = tpg_np->tpg_np;
3454                                 struct sockaddr_storage *sockaddr;
3455
3456                                 if (np->np_network_transport != network_transport)
3457                                         continue;
3458
3459                                 if (!target_name_printed) {
3460                                         len = sprintf(buf, "TargetName=%s",
3461                                                       tiqn->tiqn);
3462                                         len += 1;
3463
3464                                         if ((len + payload_len) > buffer_len) {
3465                                                 spin_unlock(&tpg->tpg_np_lock);
3466                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3467                                                 end_of_buf = 1;
3468                                                 goto eob;
3469                                         }
3470
3471                                         if (skip_bytes && len <= skip_bytes) {
3472                                                 skip_bytes -= len;
3473                                         } else {
3474                                                 memcpy(payload + payload_len, buf, len);
3475                                                 payload_len += len;
3476                                                 target_name_printed = 1;
3477                                                 if (len > skip_bytes)
3478                                                         skip_bytes = 0;
3479                                         }
3480                                 }
3481
3482                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3483                                         sockaddr = &conn->local_sockaddr;
3484                                 else
3485                                         sockaddr = &np->np_sockaddr;
3486
3487                                 len = sprintf(buf, "TargetAddress="
3488                                               "%pISpc,%hu",
3489                                               sockaddr,
3490                                               tpg->tpgt);
3491                                 len += 1;
3492
3493                                 if ((len + payload_len) > buffer_len) {
3494                                         spin_unlock(&tpg->tpg_np_lock);
3495                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3496                                         end_of_buf = 1;
3497                                         goto eob;
3498                                 }
3499
3500                                 if (skip_bytes && len <= skip_bytes) {
3501                                         skip_bytes -= len;
3502                                 } else {
3503                                         memcpy(payload + payload_len, buf, len);
3504                                         payload_len += len;
3505                                         if (len > skip_bytes)
3506                                                 skip_bytes = 0;
3507                                 }
3508                         }
3509                         spin_unlock(&tpg->tpg_np_lock);
3510                 }
3511                 spin_unlock(&tiqn->tiqn_tpg_lock);
3512 eob:
3513                 if (end_of_buf) {
3514                         *completed = false;
3515                         break;
3516                 }
3517
3518                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3519                         break;
3520         }
3521         spin_unlock(&tiqn_lock);
3522
3523         cmd->buf_ptr = payload;
3524
3525         return payload_len;
3526 }
3527
3528 int
3529 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3530                       struct iscsi_text_rsp *hdr,
3531                       enum iscsit_transport_type network_transport)
3532 {
3533         int text_length, padding;
3534         bool completed = true;
3535
3536         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3537                                                         cmd->read_data_done,
3538                                                         &completed);
3539         if (text_length < 0)
3540                 return text_length;
3541
3542         if (completed) {
3543                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3544         } else {
3545                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3546                 cmd->read_data_done += text_length;
3547                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3548                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3549         }
3550         hdr->opcode = ISCSI_OP_TEXT_RSP;
3551         padding = ((-text_length) & 3);
3552         hton24(hdr->dlength, text_length);
3553         hdr->itt = cmd->init_task_tag;
3554         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3555         cmd->stat_sn = conn->stat_sn++;
3556         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3557
3558         iscsit_increment_maxcmdsn(cmd, conn->sess);
3559         /*
3560          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3561          * correctly increment MaxCmdSN for each response answering a
3562          * non immediate text request with a valid CmdSN.
3563          */
3564         cmd->maxcmdsn_inc = 0;
3565         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3566         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3567
3568         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3569                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3570                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3571                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3572                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3573
3574         return text_length + padding;
3575 }
3576 EXPORT_SYMBOL(iscsit_build_text_rsp);
3577
3578 static int iscsit_send_text_rsp(
3579         struct iscsit_cmd *cmd,
3580         struct iscsit_conn *conn)
3581 {
3582         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3583         int text_length;
3584
3585         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3586                                 conn->conn_transport->transport_type);
3587         if (text_length < 0)
3588                 return text_length;
3589
3590         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3591                                                      cmd->buf_ptr,
3592                                                      text_length);
3593 }
3594
3595 void
3596 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
3597                     struct iscsi_reject *hdr)
3598 {
3599         hdr->opcode             = ISCSI_OP_REJECT;
3600         hdr->reason             = cmd->reject_reason;
3601         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3602         hton24(hdr->dlength, ISCSI_HDR_LEN);
3603         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3604         cmd->stat_sn            = conn->stat_sn++;
3605         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3606         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3607         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3608
3609 }
3610 EXPORT_SYMBOL(iscsit_build_reject);
3611
3612 static int iscsit_send_reject(
3613         struct iscsit_cmd *cmd,
3614         struct iscsit_conn *conn)
3615 {
3616         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3617
3618         iscsit_build_reject(cmd, conn, hdr);
3619
3620         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3621                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3622
3623         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3624                                                      cmd->buf_ptr,
3625                                                      ISCSI_HDR_LEN);
3626 }
3627
3628 void iscsit_thread_get_cpumask(struct iscsit_conn *conn)
3629 {
3630         int ord, cpu;
3631         cpumask_var_t conn_allowed_cpumask;
3632
3633         /*
3634          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3635          * within iscsit_start_kthreads()
3636          *
3637          * Here we use bitmap_id to determine which CPU that this
3638          * iSCSI connection's RX/TX threads will be scheduled to
3639          * execute upon.
3640          */
3641         if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
3642                 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3643                 for_each_online_cpu(cpu) {
3644                         if (ord-- == 0) {
3645                                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3646                                 return;
3647                         }
3648                 }
3649         } else {
3650                 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
3651                         cpu_online_mask);
3652
3653                 cpumask_clear(conn->conn_cpumask);
3654                 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
3655                 for_each_cpu(cpu, conn_allowed_cpumask) {
3656                         if (ord-- == 0) {
3657                                 cpumask_set_cpu(cpu, conn->conn_cpumask);
3658                                 free_cpumask_var(conn_allowed_cpumask);
3659                                 return;
3660                         }
3661                 }
3662                 free_cpumask_var(conn_allowed_cpumask);
3663         }
3664         /*
3665          * This should never be reached..
3666          */
3667         dump_stack();
3668         cpumask_setall(conn->conn_cpumask);
3669 }
3670
3671 static void iscsit_thread_reschedule(struct iscsit_conn *conn)
3672 {
3673         /*
3674          * If iscsit_global->allowed_cpumask modified, reschedule iSCSI
3675          * connection's RX/TX threads update conn->allowed_cpumask.
3676          */
3677         if (!cpumask_equal(iscsit_global->allowed_cpumask,
3678                            conn->allowed_cpumask)) {
3679                 iscsit_thread_get_cpumask(conn);
3680                 conn->conn_tx_reset_cpumask = 1;
3681                 conn->conn_rx_reset_cpumask = 1;
3682                 cpumask_copy(conn->allowed_cpumask,
3683                              iscsit_global->allowed_cpumask);
3684         }
3685 }
3686
3687 void iscsit_thread_check_cpumask(
3688         struct iscsit_conn *conn,
3689         struct task_struct *p,
3690         int mode)
3691 {
3692         /*
3693          * The TX and RX threads maybe call iscsit_thread_check_cpumask()
3694          * at the same time. The RX thread might be faster and return from
3695          * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0.
3696          * Then the TX thread sets it back to 1.
3697          * The next time the RX thread loops, it sees conn_rx_reset_cpumask
3698          * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0.
3699          */
3700         iscsit_thread_reschedule(conn);
3701
3702         /*
3703          * mode == 1 signals iscsi_target_tx_thread() usage.
3704          * mode == 0 signals iscsi_target_rx_thread() usage.
3705          */
3706         if (mode == 1) {
3707                 if (!conn->conn_tx_reset_cpumask)
3708                         return;
3709         } else {
3710                 if (!conn->conn_rx_reset_cpumask)
3711                         return;
3712         }
3713
3714         /*
3715          * Update the CPU mask for this single kthread so that
3716          * both TX and RX kthreads are scheduled to run on the
3717          * same CPU.
3718          */
3719         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3720         if (mode == 1)
3721                 conn->conn_tx_reset_cpumask = 0;
3722         else
3723                 conn->conn_rx_reset_cpumask = 0;
3724 }
3725 EXPORT_SYMBOL(iscsit_thread_check_cpumask);
3726
3727 int
3728 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3729 {
3730         int ret;
3731
3732         switch (state) {
3733         case ISTATE_SEND_R2T:
3734                 ret = iscsit_send_r2t(cmd, conn);
3735                 if (ret < 0)
3736                         goto err;
3737                 break;
3738         case ISTATE_REMOVE:
3739                 spin_lock_bh(&conn->cmd_lock);
3740                 list_del_init(&cmd->i_conn_node);
3741                 spin_unlock_bh(&conn->cmd_lock);
3742
3743                 iscsit_free_cmd(cmd, false);
3744                 break;
3745         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3746                 iscsit_mod_nopin_response_timer(conn);
3747                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3748                 if (ret < 0)
3749                         goto err;
3750                 break;
3751         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3752                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3753                 if (ret < 0)
3754                         goto err;
3755                 break;
3756         default:
3757                 pr_err("Unknown Opcode: 0x%02x ITT:"
3758                        " 0x%08x, i_state: %d on CID: %hu\n",
3759                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3760                        conn->cid);
3761                 goto err;
3762         }
3763
3764         return 0;
3765
3766 err:
3767         return -1;
3768 }
3769 EXPORT_SYMBOL(iscsit_immediate_queue);
3770
3771 static int
3772 iscsit_handle_immediate_queue(struct iscsit_conn *conn)
3773 {
3774         struct iscsit_transport *t = conn->conn_transport;
3775         struct iscsi_queue_req *qr;
3776         struct iscsit_cmd *cmd;
3777         u8 state;
3778         int ret;
3779
3780         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3781                 atomic_set(&conn->check_immediate_queue, 0);
3782                 cmd = qr->cmd;
3783                 state = qr->state;
3784                 kmem_cache_free(lio_qr_cache, qr);
3785
3786                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3787                 if (ret < 0)
3788                         return ret;
3789         }
3790
3791         return 0;
3792 }
3793
3794 int
3795 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
3796 {
3797         int ret;
3798
3799 check_rsp_state:
3800         switch (state) {
3801         case ISTATE_SEND_DATAIN:
3802                 ret = iscsit_send_datain(cmd, conn);
3803                 if (ret < 0)
3804                         goto err;
3805                 else if (!ret)
3806                         /* more drs */
3807                         goto check_rsp_state;
3808                 else if (ret == 1) {
3809                         /* all done */
3810                         spin_lock_bh(&cmd->istate_lock);
3811                         cmd->i_state = ISTATE_SENT_STATUS;
3812                         spin_unlock_bh(&cmd->istate_lock);
3813
3814                         if (atomic_read(&conn->check_immediate_queue))
3815                                 return 1;
3816
3817                         return 0;
3818                 } else if (ret == 2) {
3819                         /* Still must send status,
3820                            SCF_TRANSPORT_TASK_SENSE was set */
3821                         spin_lock_bh(&cmd->istate_lock);
3822                         cmd->i_state = ISTATE_SEND_STATUS;
3823                         spin_unlock_bh(&cmd->istate_lock);
3824                         state = ISTATE_SEND_STATUS;
3825                         goto check_rsp_state;
3826                 }
3827
3828                 break;
3829         case ISTATE_SEND_STATUS:
3830         case ISTATE_SEND_STATUS_RECOVERY:
3831                 ret = iscsit_send_response(cmd, conn);
3832                 break;
3833         case ISTATE_SEND_LOGOUTRSP:
3834                 ret = iscsit_send_logout(cmd, conn);
3835                 break;
3836         case ISTATE_SEND_ASYNCMSG:
3837                 ret = iscsit_send_conn_drop_async_message(
3838                         cmd, conn);
3839                 break;
3840         case ISTATE_SEND_NOPIN:
3841                 ret = iscsit_send_nopin(cmd, conn);
3842                 break;
3843         case ISTATE_SEND_REJECT:
3844                 ret = iscsit_send_reject(cmd, conn);
3845                 break;
3846         case ISTATE_SEND_TASKMGTRSP:
3847                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3848                 if (ret != 0)
3849                         break;
3850                 ret = iscsit_tmr_post_handler(cmd, conn);
3851                 if (ret != 0)
3852                         iscsit_fall_back_to_erl0(conn->sess);
3853                 break;
3854         case ISTATE_SEND_TEXTRSP:
3855                 ret = iscsit_send_text_rsp(cmd, conn);
3856                 break;
3857         default:
3858                 pr_err("Unknown Opcode: 0x%02x ITT:"
3859                        " 0x%08x, i_state: %d on CID: %hu\n",
3860                        cmd->iscsi_opcode, cmd->init_task_tag,
3861                        state, conn->cid);
3862                 goto err;
3863         }
3864         if (ret < 0)
3865                 goto err;
3866
3867         switch (state) {
3868         case ISTATE_SEND_LOGOUTRSP:
3869                 if (!iscsit_logout_post_handler(cmd, conn))
3870                         return -ECONNRESET;
3871                 fallthrough;
3872         case ISTATE_SEND_STATUS:
3873         case ISTATE_SEND_ASYNCMSG:
3874         case ISTATE_SEND_NOPIN:
3875         case ISTATE_SEND_STATUS_RECOVERY:
3876         case ISTATE_SEND_TEXTRSP:
3877         case ISTATE_SEND_TASKMGTRSP:
3878         case ISTATE_SEND_REJECT:
3879                 spin_lock_bh(&cmd->istate_lock);
3880                 cmd->i_state = ISTATE_SENT_STATUS;
3881                 spin_unlock_bh(&cmd->istate_lock);
3882                 break;
3883         default:
3884                 pr_err("Unknown Opcode: 0x%02x ITT:"
3885                        " 0x%08x, i_state: %d on CID: %hu\n",
3886                        cmd->iscsi_opcode, cmd->init_task_tag,
3887                        cmd->i_state, conn->cid);
3888                 goto err;
3889         }
3890
3891         if (atomic_read(&conn->check_immediate_queue))
3892                 return 1;
3893
3894         return 0;
3895
3896 err:
3897         return -1;
3898 }
3899 EXPORT_SYMBOL(iscsit_response_queue);
3900
3901 static int iscsit_handle_response_queue(struct iscsit_conn *conn)
3902 {
3903         struct iscsit_transport *t = conn->conn_transport;
3904         struct iscsi_queue_req *qr;
3905         struct iscsit_cmd *cmd;
3906         u8 state;
3907         int ret;
3908
3909         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3910                 cmd = qr->cmd;
3911                 state = qr->state;
3912                 kmem_cache_free(lio_qr_cache, qr);
3913
3914                 ret = t->iscsit_response_queue(conn, cmd, state);
3915                 if (ret == 1 || ret < 0)
3916                         return ret;
3917         }
3918
3919         return 0;
3920 }
3921
3922 int iscsi_target_tx_thread(void *arg)
3923 {
3924         int ret = 0;
3925         struct iscsit_conn *conn = arg;
3926         bool conn_freed = false;
3927
3928         /*
3929          * Allow ourselves to be interrupted by SIGINT so that a
3930          * connection recovery / failure event can be triggered externally.
3931          */
3932         allow_signal(SIGINT);
3933
3934         while (!kthread_should_stop()) {
3935                 /*
3936                  * Ensure that both TX and RX per connection kthreads
3937                  * are scheduled to run on the same CPU.
3938                  */
3939                 iscsit_thread_check_cpumask(conn, current, 1);
3940
3941                 wait_event_interruptible(conn->queues_wq,
3942                                          !iscsit_conn_all_queues_empty(conn));
3943
3944                 if (signal_pending(current))
3945                         goto transport_err;
3946
3947 get_immediate:
3948                 ret = iscsit_handle_immediate_queue(conn);
3949                 if (ret < 0)
3950                         goto transport_err;
3951
3952                 ret = iscsit_handle_response_queue(conn);
3953                 if (ret == 1) {
3954                         goto get_immediate;
3955                 } else if (ret == -ECONNRESET) {
3956                         conn_freed = true;
3957                         goto out;
3958                 } else if (ret < 0) {
3959                         goto transport_err;
3960                 }
3961         }
3962
3963 transport_err:
3964         /*
3965          * Avoid the normal connection failure code-path if this connection
3966          * is still within LOGIN mode, and iscsi_np process context is
3967          * responsible for cleaning up the early connection failure.
3968          */
3969         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3970                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3971 out:
3972         if (!conn_freed) {
3973                 while (!kthread_should_stop()) {
3974                         msleep(100);
3975                 }
3976         }
3977         return 0;
3978 }
3979
3980 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf)
3981 {
3982         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3983         struct iscsit_cmd *cmd;
3984         int ret = 0;
3985
3986         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3987         case ISCSI_OP_SCSI_CMD:
3988                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3989                 if (!cmd)
3990                         goto reject;
3991
3992                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3993                 break;
3994         case ISCSI_OP_SCSI_DATA_OUT:
3995                 ret = iscsit_handle_data_out(conn, buf);
3996                 break;
3997         case ISCSI_OP_NOOP_OUT:
3998                 cmd = NULL;
3999                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4000                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4001                         if (!cmd)
4002                                 goto reject;
4003                 }
4004                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4005                 break;
4006         case ISCSI_OP_SCSI_TMFUNC:
4007                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4008                 if (!cmd)
4009                         goto reject;
4010
4011                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4012                 break;
4013         case ISCSI_OP_TEXT:
4014                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4015                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4016                         if (!cmd)
4017                                 goto reject;
4018                 } else {
4019                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4020                         if (!cmd)
4021                                 goto reject;
4022                 }
4023
4024                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4025                 break;
4026         case ISCSI_OP_LOGOUT:
4027                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4028                 if (!cmd)
4029                         goto reject;
4030
4031                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4032                 if (ret > 0)
4033                         wait_for_completion_timeout(&conn->conn_logout_comp,
4034                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4035                 break;
4036         case ISCSI_OP_SNACK:
4037                 ret = iscsit_handle_snack(conn, buf);
4038                 break;
4039         default:
4040                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4041                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4042                         pr_err("Cannot recover from unknown"
4043                         " opcode while ERL=0, closing iSCSI connection.\n");
4044                         return -1;
4045                 }
4046                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4047                        " closing iSCSI connection.\n");
4048                 ret = -1;
4049                 break;
4050         }
4051
4052         return ret;
4053 reject:
4054         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4055 }
4056
4057 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn)
4058 {
4059         bool ret;
4060
4061         spin_lock_bh(&conn->state_lock);
4062         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4063         spin_unlock_bh(&conn->state_lock);
4064
4065         return ret;
4066 }
4067
4068 static void iscsit_get_rx_pdu(struct iscsit_conn *conn)
4069 {
4070         int ret;
4071         u8 *buffer, *tmp_buf, opcode;
4072         u32 checksum = 0, digest = 0;
4073         struct iscsi_hdr *hdr;
4074         struct kvec iov;
4075
4076         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
4077         if (!buffer)
4078                 return;
4079
4080         while (!kthread_should_stop()) {
4081                 /*
4082                  * Ensure that both TX and RX per connection kthreads
4083                  * are scheduled to run on the same CPU.
4084                  */
4085                 iscsit_thread_check_cpumask(conn, current, 0);
4086
4087                 memset(&iov, 0, sizeof(struct kvec));
4088
4089                 iov.iov_base    = buffer;
4090                 iov.iov_len     = ISCSI_HDR_LEN;
4091
4092                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4093                 if (ret != ISCSI_HDR_LEN) {
4094                         iscsit_rx_thread_wait_for_tcp(conn);
4095                         break;
4096                 }
4097
4098                 hdr = (struct iscsi_hdr *) buffer;
4099                 if (hdr->hlength) {
4100                         iov.iov_len = hdr->hlength * 4;
4101                         tmp_buf = krealloc(buffer,
4102                                           ISCSI_HDR_LEN + iov.iov_len,
4103                                           GFP_KERNEL);
4104                         if (!tmp_buf)
4105                                 break;
4106
4107                         buffer = tmp_buf;
4108                         iov.iov_base = &buffer[ISCSI_HDR_LEN];
4109
4110                         ret = rx_data(conn, &iov, 1, iov.iov_len);
4111                         if (ret != iov.iov_len) {
4112                                 iscsit_rx_thread_wait_for_tcp(conn);
4113                                 break;
4114                         }
4115                 }
4116
4117                 if (conn->conn_ops->HeaderDigest) {
4118                         iov.iov_base    = &digest;
4119                         iov.iov_len     = ISCSI_CRC_LEN;
4120
4121                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4122                         if (ret != ISCSI_CRC_LEN) {
4123                                 iscsit_rx_thread_wait_for_tcp(conn);
4124                                 break;
4125                         }
4126
4127                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
4128                                                   ISCSI_HDR_LEN, 0, NULL,
4129                                                   &checksum);
4130
4131                         if (digest != checksum) {
4132                                 pr_err("HeaderDigest CRC32C failed,"
4133                                         " received 0x%08x, computed 0x%08x\n",
4134                                         digest, checksum);
4135                                 /*
4136                                  * Set the PDU to 0xff so it will intentionally
4137                                  * hit default in the switch below.
4138                                  */
4139                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4140                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4141                         } else {
4142                                 pr_debug("Got HeaderDigest CRC32C"
4143                                                 " 0x%08x\n", checksum);
4144                         }
4145                 }
4146
4147                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4148                         break;
4149
4150                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4151
4152                 if (conn->sess->sess_ops->SessionType &&
4153                    ((!(opcode & ISCSI_OP_TEXT)) ||
4154                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4155                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4156                         " while in Discovery Session, rejecting.\n", opcode);
4157                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4158                                           buffer);
4159                         break;
4160                 }
4161
4162                 ret = iscsi_target_rx_opcode(conn, buffer);
4163                 if (ret < 0)
4164                         break;
4165         }
4166
4167         kfree(buffer);
4168 }
4169
4170 int iscsi_target_rx_thread(void *arg)
4171 {
4172         int rc;
4173         struct iscsit_conn *conn = arg;
4174         bool conn_freed = false;
4175
4176         /*
4177          * Allow ourselves to be interrupted by SIGINT so that a
4178          * connection recovery / failure event can be triggered externally.
4179          */
4180         allow_signal(SIGINT);
4181         /*
4182          * Wait for iscsi_post_login_handler() to complete before allowing
4183          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4184          */
4185         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4186         if (rc < 0 || iscsi_target_check_conn_state(conn))
4187                 goto out;
4188
4189         if (!conn->conn_transport->iscsit_get_rx_pdu)
4190                 return 0;
4191
4192         conn->conn_transport->iscsit_get_rx_pdu(conn);
4193
4194         if (!signal_pending(current))
4195                 atomic_set(&conn->transport_failed, 1);
4196         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4197
4198 out:
4199         if (!conn_freed) {
4200                 while (!kthread_should_stop()) {
4201                         msleep(100);
4202                 }
4203         }
4204
4205         return 0;
4206 }
4207
4208 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn)
4209 {
4210         LIST_HEAD(tmp_list);
4211         struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL;
4212         struct iscsit_session *sess = conn->sess;
4213         /*
4214          * We expect this function to only ever be called from either RX or TX
4215          * thread context via iscsit_close_connection() once the other context
4216          * has been reset -> returned sleeping pre-handler state.
4217          */
4218         spin_lock_bh(&conn->cmd_lock);
4219         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4220
4221         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4222                 struct se_cmd *se_cmd = &cmd->se_cmd;
4223
4224                 if (!se_cmd->se_tfo)
4225                         continue;
4226
4227                 spin_lock_irq(&se_cmd->t_state_lock);
4228                 if (se_cmd->transport_state & CMD_T_ABORTED) {
4229                         if (!(se_cmd->transport_state & CMD_T_TAS))
4230                                 /*
4231                                  * LIO's abort path owns the cleanup for this,
4232                                  * so put it back on the list and let
4233                                  * aborted_task handle it.
4234                                  */
4235                                 list_move_tail(&cmd->i_conn_node,
4236                                                &conn->conn_cmd_list);
4237                 } else {
4238                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4239                 }
4240
4241                 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
4242                         /*
4243                          * We never submitted the cmd to LIO core, so we have
4244                          * to tell LIO to perform the completion process.
4245                          */
4246                         spin_unlock_irq(&se_cmd->t_state_lock);
4247                         target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED);
4248                         continue;
4249                 }
4250                 spin_unlock_irq(&se_cmd->t_state_lock);
4251         }
4252         spin_unlock_bh(&conn->cmd_lock);
4253
4254         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4255                 list_del_init(&cmd->i_conn_node);
4256
4257                 iscsit_increment_maxcmdsn(cmd, sess);
4258                 iscsit_free_cmd(cmd, true);
4259
4260         }
4261
4262         /*
4263          * Wait on commands that were cleaned up via the aborted_task path.
4264          * LLDs that implement iscsit_wait_conn will already have waited for
4265          * commands.
4266          */
4267         if (!conn->conn_transport->iscsit_wait_conn) {
4268                 target_stop_cmd_counter(conn->cmd_cnt);
4269                 target_wait_for_cmds(conn->cmd_cnt);
4270         }
4271 }
4272
4273 static void iscsit_stop_timers_for_cmds(
4274         struct iscsit_conn *conn)
4275 {
4276         struct iscsit_cmd *cmd;
4277
4278         spin_lock_bh(&conn->cmd_lock);
4279         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4280                 if (cmd->data_direction == DMA_TO_DEVICE)
4281                         iscsit_stop_dataout_timer(cmd);
4282         }
4283         spin_unlock_bh(&conn->cmd_lock);
4284 }
4285
4286 int iscsit_close_connection(
4287         struct iscsit_conn *conn)
4288 {
4289         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4290         struct iscsit_session   *sess = conn->sess;
4291
4292         pr_debug("Closing iSCSI connection CID %hu on SID:"
4293                 " %u\n", conn->cid, sess->sid);
4294         /*
4295          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4296          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4297          * sleeping and the logout response never got sent because the
4298          * connection failed.
4299          *
4300          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4301          * to signal logout response TX interrupt completion.  Go ahead and skip
4302          * this for iser since isert_rx_opcode() does not wait on logout failure,
4303          * and to avoid iscsit_conn pointer dereference in iser-target code.
4304          */
4305         if (!conn->conn_transport->rdma_shutdown)
4306                 complete(&conn->conn_logout_comp);
4307
4308         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4309                 if (conn->tx_thread &&
4310                     cmpxchg(&conn->tx_thread_active, true, false)) {
4311                         send_sig(SIGINT, conn->tx_thread, 1);
4312                         kthread_stop(conn->tx_thread);
4313                 }
4314         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4315                 if (conn->rx_thread &&
4316                     cmpxchg(&conn->rx_thread_active, true, false)) {
4317                         send_sig(SIGINT, conn->rx_thread, 1);
4318                         kthread_stop(conn->rx_thread);
4319                 }
4320         }
4321
4322         spin_lock(&iscsit_global->ts_bitmap_lock);
4323         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4324                               get_order(1));
4325         spin_unlock(&iscsit_global->ts_bitmap_lock);
4326
4327         iscsit_stop_timers_for_cmds(conn);
4328         iscsit_stop_nopin_response_timer(conn);
4329         iscsit_stop_nopin_timer(conn);
4330
4331         if (conn->conn_transport->iscsit_wait_conn)
4332                 conn->conn_transport->iscsit_wait_conn(conn);
4333
4334         /*
4335          * During Connection recovery drop unacknowledged out of order
4336          * commands for this connection, and prepare the other commands
4337          * for reallegiance.
4338          *
4339          * During normal operation clear the out of order commands (but
4340          * do not free the struct iscsi_ooo_cmdsn's) and release all
4341          * struct iscsit_cmds.
4342          */
4343         if (atomic_read(&conn->connection_recovery)) {
4344                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4345                 iscsit_prepare_cmds_for_reallegiance(conn);
4346         } else {
4347                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4348                 iscsit_release_commands_from_conn(conn);
4349         }
4350         iscsit_free_queue_reqs_for_conn(conn);
4351
4352         /*
4353          * Handle decrementing session or connection usage count if
4354          * a logout response was not able to be sent because the
4355          * connection failed.  Fall back to Session Recovery here.
4356          */
4357         if (atomic_read(&conn->conn_logout_remove)) {
4358                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4359                         iscsit_dec_conn_usage_count(conn);
4360                         iscsit_dec_session_usage_count(sess);
4361                 }
4362                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4363                         iscsit_dec_conn_usage_count(conn);
4364
4365                 atomic_set(&conn->conn_logout_remove, 0);
4366                 atomic_set(&sess->session_reinstatement, 0);
4367                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4368         }
4369
4370         spin_lock_bh(&sess->conn_lock);
4371         list_del(&conn->conn_list);
4372
4373         /*
4374          * Attempt to let the Initiator know this connection failed by
4375          * sending an Connection Dropped Async Message on another
4376          * active connection.
4377          */
4378         if (atomic_read(&conn->connection_recovery))
4379                 iscsit_build_conn_drop_async_message(conn);
4380
4381         spin_unlock_bh(&sess->conn_lock);
4382
4383         /*
4384          * If connection reinstatement is being performed on this connection,
4385          * up the connection reinstatement semaphore that is being blocked on
4386          * in iscsit_cause_connection_reinstatement().
4387          */
4388         spin_lock_bh(&conn->state_lock);
4389         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4390                 spin_unlock_bh(&conn->state_lock);
4391                 complete(&conn->conn_wait_comp);
4392                 wait_for_completion(&conn->conn_post_wait_comp);
4393                 spin_lock_bh(&conn->state_lock);
4394         }
4395
4396         /*
4397          * If connection reinstatement is being performed on this connection
4398          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4399          * connection wait rcfr semaphore that is being blocked on
4400          * an iscsit_connection_reinstatement_rcfr().
4401          */
4402         if (atomic_read(&conn->connection_wait_rcfr)) {
4403                 spin_unlock_bh(&conn->state_lock);
4404                 complete(&conn->conn_wait_rcfr_comp);
4405                 wait_for_completion(&conn->conn_post_wait_comp);
4406                 spin_lock_bh(&conn->state_lock);
4407         }
4408         atomic_set(&conn->connection_reinstatement, 1);
4409         spin_unlock_bh(&conn->state_lock);
4410
4411         /*
4412          * If any other processes are accessing this connection pointer we
4413          * must wait until they have completed.
4414          */
4415         iscsit_check_conn_usage_count(conn);
4416
4417         ahash_request_free(conn->conn_tx_hash);
4418         if (conn->conn_rx_hash) {
4419                 struct crypto_ahash *tfm;
4420
4421                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4422                 ahash_request_free(conn->conn_rx_hash);
4423                 crypto_free_ahash(tfm);
4424         }
4425
4426         if (conn->sock)
4427                 sock_release(conn->sock);
4428
4429         if (conn->conn_transport->iscsit_free_conn)
4430                 conn->conn_transport->iscsit_free_conn(conn);
4431
4432         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4433         conn->conn_state = TARG_CONN_STATE_FREE;
4434         iscsit_free_conn(conn);
4435
4436         spin_lock_bh(&sess->conn_lock);
4437         atomic_dec(&sess->nconn);
4438         pr_debug("Decremented iSCSI connection count to %d from node:"
4439                 " %s\n", atomic_read(&sess->nconn),
4440                 sess->sess_ops->InitiatorName);
4441         /*
4442          * Make sure that if one connection fails in an non ERL=2 iSCSI
4443          * Session that they all fail.
4444          */
4445         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4446              !atomic_read(&sess->session_logout))
4447                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4448
4449         /*
4450          * If this was not the last connection in the session, and we are
4451          * performing session reinstatement or falling back to ERL=0, call
4452          * iscsit_stop_session() without sleeping to shutdown the other
4453          * active connections.
4454          */
4455         if (atomic_read(&sess->nconn)) {
4456                 if (!atomic_read(&sess->session_reinstatement) &&
4457                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4458                         spin_unlock_bh(&sess->conn_lock);
4459                         return 0;
4460                 }
4461                 if (!atomic_read(&sess->session_stop_active)) {
4462                         atomic_set(&sess->session_stop_active, 1);
4463                         spin_unlock_bh(&sess->conn_lock);
4464                         iscsit_stop_session(sess, 0, 0);
4465                         return 0;
4466                 }
4467                 spin_unlock_bh(&sess->conn_lock);
4468                 return 0;
4469         }
4470
4471         /*
4472          * If this was the last connection in the session and one of the
4473          * following is occurring:
4474          *
4475          * Session Reinstatement is not being performed, and are falling back
4476          * to ERL=0 call iscsit_close_session().
4477          *
4478          * Session Logout was requested.  iscsit_close_session() will be called
4479          * elsewhere.
4480          *
4481          * Session Continuation is not being performed, start the Time2Retain
4482          * handler and check if sleep_on_sess_wait_sem is active.
4483          */
4484         if (!atomic_read(&sess->session_reinstatement) &&
4485              atomic_read(&sess->session_fall_back_to_erl0)) {
4486                 spin_unlock_bh(&sess->conn_lock);
4487                 complete_all(&sess->session_wait_comp);
4488                 iscsit_close_session(sess, true);
4489
4490                 return 0;
4491         } else if (atomic_read(&sess->session_logout)) {
4492                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4493                 sess->session_state = TARG_SESS_STATE_FREE;
4494
4495                 if (atomic_read(&sess->session_close)) {
4496                         spin_unlock_bh(&sess->conn_lock);
4497                         complete_all(&sess->session_wait_comp);
4498                         iscsit_close_session(sess, true);
4499                 } else {
4500                         spin_unlock_bh(&sess->conn_lock);
4501                 }
4502
4503                 return 0;
4504         } else {
4505                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4506                 sess->session_state = TARG_SESS_STATE_FAILED;
4507
4508                 if (!atomic_read(&sess->session_continuation))
4509                         iscsit_start_time2retain_handler(sess);
4510
4511                 if (atomic_read(&sess->session_close)) {
4512                         spin_unlock_bh(&sess->conn_lock);
4513                         complete_all(&sess->session_wait_comp);
4514                         iscsit_close_session(sess, true);
4515                 } else {
4516                         spin_unlock_bh(&sess->conn_lock);
4517                 }
4518
4519                 return 0;
4520         }
4521 }
4522
4523 /*
4524  * If the iSCSI Session for the iSCSI Initiator Node exists,
4525  * forcefully shutdown the iSCSI NEXUS.
4526  */
4527 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep)
4528 {
4529         struct iscsi_portal_group *tpg = sess->tpg;
4530         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4531
4532         if (atomic_read(&sess->nconn)) {
4533                 pr_err("%d connection(s) still exist for iSCSI session"
4534                         " to %s\n", atomic_read(&sess->nconn),
4535                         sess->sess_ops->InitiatorName);
4536                 BUG();
4537         }
4538
4539         spin_lock_bh(&se_tpg->session_lock);
4540         atomic_set(&sess->session_logout, 1);
4541         atomic_set(&sess->session_reinstatement, 1);
4542         iscsit_stop_time2retain_timer(sess);
4543         spin_unlock_bh(&se_tpg->session_lock);
4544
4545         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4546                 iscsit_free_connection_recovery_entries(sess);
4547
4548         /*
4549          * transport_deregister_session_configfs() will clear the
4550          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4551          * can be setting it again with __transport_register_session() in
4552          * iscsi_post_login_handler() again after the iscsit_stop_session()
4553          * completes in iscsi_np context.
4554          */
4555         transport_deregister_session_configfs(sess->se_sess);
4556
4557         /*
4558          * If any other processes are accessing this session pointer we must
4559          * wait until they have completed.  If we are in an interrupt (the
4560          * time2retain handler) and contain and active session usage count we
4561          * restart the timer and exit.
4562          */
4563         if (iscsit_check_session_usage_count(sess, can_sleep)) {
4564                 atomic_set(&sess->session_logout, 0);
4565                 iscsit_start_time2retain_handler(sess);
4566                 return 0;
4567         }
4568
4569         transport_deregister_session(sess->se_sess);
4570
4571         iscsit_free_all_ooo_cmdsns(sess);
4572
4573         spin_lock_bh(&se_tpg->session_lock);
4574         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4575         sess->session_state = TARG_SESS_STATE_FREE;
4576         pr_debug("Released iSCSI session from node: %s\n",
4577                         sess->sess_ops->InitiatorName);
4578         tpg->nsessions--;
4579         if (tpg->tpg_tiqn)
4580                 tpg->tpg_tiqn->tiqn_nsessions--;
4581
4582         pr_debug("Decremented number of active iSCSI Sessions on"
4583                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4584
4585         ida_free(&sess_ida, sess->session_index);
4586         kfree(sess->sess_ops);
4587         sess->sess_ops = NULL;
4588         spin_unlock_bh(&se_tpg->session_lock);
4589
4590         kfree(sess);
4591         return 0;
4592 }
4593
4594 static void iscsit_logout_post_handler_closesession(
4595         struct iscsit_conn *conn)
4596 {
4597         struct iscsit_session *sess = conn->sess;
4598         int sleep = 1;
4599         /*
4600          * Traditional iscsi/tcp will invoke this logic from TX thread
4601          * context during session logout, so clear tx_thread_active and
4602          * sleep if iscsit_close_connection() has not already occured.
4603          *
4604          * Since iser-target invokes this logic from it's own workqueue,
4605          * always sleep waiting for RX/TX thread shutdown to complete
4606          * within iscsit_close_connection().
4607          */
4608         if (!conn->conn_transport->rdma_shutdown) {
4609                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4610                 if (!sleep)
4611                         return;
4612         }
4613
4614         atomic_set(&conn->conn_logout_remove, 0);
4615         complete(&conn->conn_logout_comp);
4616
4617         iscsit_dec_conn_usage_count(conn);
4618         atomic_set(&sess->session_close, 1);
4619         iscsit_stop_session(sess, sleep, sleep);
4620         iscsit_dec_session_usage_count(sess);
4621 }
4622
4623 static void iscsit_logout_post_handler_samecid(
4624         struct iscsit_conn *conn)
4625 {
4626         int sleep = 1;
4627
4628         if (!conn->conn_transport->rdma_shutdown) {
4629                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4630                 if (!sleep)
4631                         return;
4632         }
4633
4634         atomic_set(&conn->conn_logout_remove, 0);
4635         complete(&conn->conn_logout_comp);
4636
4637         iscsit_cause_connection_reinstatement(conn, sleep);
4638         iscsit_dec_conn_usage_count(conn);
4639 }
4640
4641 static void iscsit_logout_post_handler_diffcid(
4642         struct iscsit_conn *conn,
4643         u16 cid)
4644 {
4645         struct iscsit_conn *l_conn;
4646         struct iscsit_session *sess = conn->sess;
4647         bool conn_found = false;
4648
4649         if (!sess)
4650                 return;
4651
4652         spin_lock_bh(&sess->conn_lock);
4653         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4654                 if (l_conn->cid == cid) {
4655                         iscsit_inc_conn_usage_count(l_conn);
4656                         conn_found = true;
4657                         break;
4658                 }
4659         }
4660         spin_unlock_bh(&sess->conn_lock);
4661
4662         if (!conn_found)
4663                 return;
4664
4665         if (l_conn->sock)
4666                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4667
4668         spin_lock_bh(&l_conn->state_lock);
4669         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4670         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4671         spin_unlock_bh(&l_conn->state_lock);
4672
4673         iscsit_cause_connection_reinstatement(l_conn, 1);
4674         iscsit_dec_conn_usage_count(l_conn);
4675 }
4676
4677 /*
4678  *      Return of 0 causes the TX thread to restart.
4679  */
4680 int iscsit_logout_post_handler(
4681         struct iscsit_cmd *cmd,
4682         struct iscsit_conn *conn)
4683 {
4684         int ret = 0;
4685
4686         switch (cmd->logout_reason) {
4687         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4688                 switch (cmd->logout_response) {
4689                 case ISCSI_LOGOUT_SUCCESS:
4690                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4691                 default:
4692                         iscsit_logout_post_handler_closesession(conn);
4693                         break;
4694                 }
4695                 break;
4696         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4697                 if (conn->cid == cmd->logout_cid) {
4698                         switch (cmd->logout_response) {
4699                         case ISCSI_LOGOUT_SUCCESS:
4700                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4701                         default:
4702                                 iscsit_logout_post_handler_samecid(conn);
4703                                 break;
4704                         }
4705                 } else {
4706                         switch (cmd->logout_response) {
4707                         case ISCSI_LOGOUT_SUCCESS:
4708                                 iscsit_logout_post_handler_diffcid(conn,
4709                                         cmd->logout_cid);
4710                                 break;
4711                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4712                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4713                         default:
4714                                 break;
4715                         }
4716                         ret = 1;
4717                 }
4718                 break;
4719         case ISCSI_LOGOUT_REASON_RECOVERY:
4720                 switch (cmd->logout_response) {
4721                 case ISCSI_LOGOUT_SUCCESS:
4722                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4723                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4724                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4725                 default:
4726                         break;
4727                 }
4728                 ret = 1;
4729                 break;
4730         default:
4731                 break;
4732
4733         }
4734         return ret;
4735 }
4736 EXPORT_SYMBOL(iscsit_logout_post_handler);
4737
4738 void iscsit_fail_session(struct iscsit_session *sess)
4739 {
4740         struct iscsit_conn *conn;
4741
4742         spin_lock_bh(&sess->conn_lock);
4743         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4744                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4745                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4746         }
4747         spin_unlock_bh(&sess->conn_lock);
4748
4749         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4750         sess->session_state = TARG_SESS_STATE_FAILED;
4751 }
4752
4753 void iscsit_stop_session(
4754         struct iscsit_session *sess,
4755         int session_sleep,
4756         int connection_sleep)
4757 {
4758         u16 conn_count = atomic_read(&sess->nconn);
4759         struct iscsit_conn *conn, *conn_tmp = NULL;
4760         int is_last;
4761
4762         spin_lock_bh(&sess->conn_lock);
4763
4764         if (connection_sleep) {
4765                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4766                                 conn_list) {
4767                         if (conn_count == 0)
4768                                 break;
4769
4770                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4771                                 is_last = 1;
4772                         } else {
4773                                 iscsit_inc_conn_usage_count(conn_tmp);
4774                                 is_last = 0;
4775                         }
4776                         iscsit_inc_conn_usage_count(conn);
4777
4778                         spin_unlock_bh(&sess->conn_lock);
4779                         iscsit_cause_connection_reinstatement(conn, 1);
4780                         spin_lock_bh(&sess->conn_lock);
4781
4782                         iscsit_dec_conn_usage_count(conn);
4783                         if (is_last == 0)
4784                                 iscsit_dec_conn_usage_count(conn_tmp);
4785                         conn_count--;
4786                 }
4787         } else {
4788                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4789                         iscsit_cause_connection_reinstatement(conn, 0);
4790         }
4791
4792         if (session_sleep && atomic_read(&sess->nconn)) {
4793                 spin_unlock_bh(&sess->conn_lock);
4794                 wait_for_completion(&sess->session_wait_comp);
4795         } else
4796                 spin_unlock_bh(&sess->conn_lock);
4797 }
4798
4799 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4800 {
4801         struct iscsit_session *sess;
4802         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4803         struct se_session *se_sess, *se_sess_tmp;
4804         LIST_HEAD(free_list);
4805         int session_count = 0;
4806
4807         spin_lock_bh(&se_tpg->session_lock);
4808         if (tpg->nsessions && !force) {
4809                 spin_unlock_bh(&se_tpg->session_lock);
4810                 return -1;
4811         }
4812
4813         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4814                         sess_list) {
4815                 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4816
4817                 spin_lock(&sess->conn_lock);
4818                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4819                     atomic_read(&sess->session_logout) ||
4820                     atomic_read(&sess->session_close) ||
4821                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4822                         spin_unlock(&sess->conn_lock);
4823                         continue;
4824                 }
4825                 iscsit_inc_session_usage_count(sess);
4826                 atomic_set(&sess->session_reinstatement, 1);
4827                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4828                 atomic_set(&sess->session_close, 1);
4829                 spin_unlock(&sess->conn_lock);
4830
4831                 list_move_tail(&se_sess->sess_list, &free_list);
4832         }
4833         spin_unlock_bh(&se_tpg->session_lock);
4834
4835         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4836                 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr;
4837
4838                 list_del_init(&se_sess->sess_list);
4839                 iscsit_stop_session(sess, 1, 1);
4840                 iscsit_dec_session_usage_count(sess);
4841                 session_count++;
4842         }
4843
4844         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4845                         " Group: %hu\n", session_count, tpg->tpgt);
4846         return 0;
4847 }
4848
4849 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4850 MODULE_VERSION("4.1.x");
4851 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4852 MODULE_LICENSE("GPL");
4853
4854 module_init(iscsi_target_init_module);
4855 module_exit(iscsi_target_cleanup_module);