drivers/target/iscsi/iscsi

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

DEFINITIONS
