include/scsi/iscsi_if.h

   1 /*
   2  * iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
   3  *
   4  * Copyright (C) 2005 Dmitry Yusupov
   5  * Copyright (C) 2005 Alex Aizman
   6  * maintained by open-iscsi@googlegroups.com
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published
  10  * by the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  * See the file COPYING included with this distribution for more details.
  19  */
  20
  21 #ifndef ISCSI_IF_H
  22 #define ISCSI_IF_H
  23
  24 #include <scsi/iscsi_proto.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27
  28 #define ISCSI_NL_GRP_ISCSID     1
  29 #define ISCSI_NL_GRP_UIP        2
  30
  31 #define UEVENT_BASE                     10
  32 #define KEVENT_BASE                     100
  33 #define ISCSI_ERR_BASE                  1000
  34
  35 enum iscsi_uevent_e {
  36         ISCSI_UEVENT_UNKNOWN            = 0,
  37
  38         /* down events */
  39         ISCSI_UEVENT_CREATE_SESSION     = UEVENT_BASE + 1,
  40         ISCSI_UEVENT_DESTROY_SESSION    = UEVENT_BASE + 2,
  41         ISCSI_UEVENT_CREATE_CONN        = UEVENT_BASE + 3,
  42         ISCSI_UEVENT_DESTROY_CONN       = UEVENT_BASE + 4,
  43         ISCSI_UEVENT_BIND_CONN          = UEVENT_BASE + 5,
  44         ISCSI_UEVENT_SET_PARAM          = UEVENT_BASE + 6,
  45         ISCSI_UEVENT_START_CONN         = UEVENT_BASE + 7,
  46         ISCSI_UEVENT_STOP_CONN          = UEVENT_BASE + 8,
  47         ISCSI_UEVENT_SEND_PDU           = UEVENT_BASE + 9,
  48         ISCSI_UEVENT_GET_STATS          = UEVENT_BASE + 10,
  49         ISCSI_UEVENT_GET_PARAM          = UEVENT_BASE + 11,
  50
  51         ISCSI_UEVENT_TRANSPORT_EP_CONNECT       = UEVENT_BASE + 12,
  52         ISCSI_UEVENT_TRANSPORT_EP_POLL          = UEVENT_BASE + 13,
  53         ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT    = UEVENT_BASE + 14,
  54
  55         ISCSI_UEVENT_TGT_DSCVR          = UEVENT_BASE + 15,
  56         ISCSI_UEVENT_SET_HOST_PARAM     = UEVENT_BASE + 16,
  57         ISCSI_UEVENT_UNBIND_SESSION     = UEVENT_BASE + 17,
  58         ISCSI_UEVENT_CREATE_BOUND_SESSION               = UEVENT_BASE + 18,
  59         ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST  = UEVENT_BASE + 19,
  60
  61         ISCSI_UEVENT_PATH_UPDATE        = UEVENT_BASE + 20,
  62         ISCSI_UEVENT_SET_IFACE_PARAMS   = UEVENT_BASE + 21,
  63         ISCSI_UEVENT_PING               = UEVENT_BASE + 22,
  64         ISCSI_UEVENT_GET_CHAP           = UEVENT_BASE + 23,
  65         ISCSI_UEVENT_DELETE_CHAP        = UEVENT_BASE + 24,
  66         ISCSI_UEVENT_SET_FLASHNODE_PARAMS       = UEVENT_BASE + 25,
  67         ISCSI_UEVENT_NEW_FLASHNODE      = UEVENT_BASE + 26,
  68         ISCSI_UEVENT_DEL_FLASHNODE      = UEVENT_BASE + 27,
  69         ISCSI_UEVENT_LOGIN_FLASHNODE    = UEVENT_BASE + 28,
  70         ISCSI_UEVENT_LOGOUT_FLASHNODE   = UEVENT_BASE + 29,
  71         ISCSI_UEVENT_LOGOUT_FLASHNODE_SID       = UEVENT_BASE + 30,
  72         ISCSI_UEVENT_SET_CHAP           = UEVENT_BASE + 31,
  73         ISCSI_UEVENT_GET_HOST_STATS     = UEVENT_BASE + 32,
  74
  75         /* up events */
  76         ISCSI_KEVENT_RECV_PDU           = KEVENT_BASE + 1,
  77         ISCSI_KEVENT_CONN_ERROR         = KEVENT_BASE + 2,
  78         ISCSI_KEVENT_IF_ERROR           = KEVENT_BASE + 3,
  79         ISCSI_KEVENT_DESTROY_SESSION    = KEVENT_BASE + 4,
  80         ISCSI_KEVENT_UNBIND_SESSION     = KEVENT_BASE + 5,
  81         ISCSI_KEVENT_CREATE_SESSION     = KEVENT_BASE + 6,
  82
  83         ISCSI_KEVENT_PATH_REQ           = KEVENT_BASE + 7,
  84         ISCSI_KEVENT_IF_DOWN            = KEVENT_BASE + 8,
  85         ISCSI_KEVENT_CONN_LOGIN_STATE   = KEVENT_BASE + 9,
  86         ISCSI_KEVENT_HOST_EVENT         = KEVENT_BASE + 10,
  87         ISCSI_KEVENT_PING_COMP          = KEVENT_BASE + 11,
  88 };
  89
  90 enum iscsi_tgt_dscvr {
  91         ISCSI_TGT_DSCVR_SEND_TARGETS    = 1,
  92         ISCSI_TGT_DSCVR_ISNS            = 2,
  93         ISCSI_TGT_DSCVR_SLP             = 3,
  94 };
  95
  96 enum iscsi_host_event_code {
  97         ISCSI_EVENT_LINKUP              = 1,
  98         ISCSI_EVENT_LINKDOWN,
  99         /* must always be last */
 100         ISCSI_EVENT_MAX,
 101 };
 102
 103 struct iscsi_uevent {
 104         uint32_t type; /* k/u events type */
 105         uint32_t iferror; /* carries interface or resource errors */
 106         uint64_t transport_handle;
 107
 108         union {
 109                 /* messages u -> k */
 110                 struct msg_create_session {
 111                         uint32_t        initial_cmdsn;
 112                         uint16_t        cmds_max;
 113                         uint16_t        queue_depth;
 114                 } c_session;
 115                 struct msg_create_bound_session {
 116                         uint64_t        ep_handle;
 117                         uint32_t        initial_cmdsn;
 118                         uint16_t        cmds_max;
 119                         uint16_t        queue_depth;
 120                 } c_bound_session;
 121                 struct msg_destroy_session {
 122                         uint32_t        sid;
 123                 } d_session;
 124                 struct msg_create_conn {
 125                         uint32_t        sid;
 126                         uint32_t        cid;
 127                 } c_conn;
 128                 struct msg_bind_conn {
 129                         uint32_t        sid;
 130                         uint32_t        cid;
 131                         uint64_t        transport_eph;
 132                         uint32_t        is_leading;
 133                 } b_conn;
 134                 struct msg_destroy_conn {
 135                         uint32_t        sid;
 136                         uint32_t        cid;
 137                 } d_conn;
 138                 struct msg_send_pdu {
 139                         uint32_t        sid;
 140                         uint32_t        cid;
 141                         uint32_t        hdr_size;
 142                         uint32_t        data_size;
 143                 } send_pdu;
 144                 struct msg_set_param {
 145                         uint32_t        sid;
 146                         uint32_t        cid;
 147                         uint32_t        param; /* enum iscsi_param */
 148                         uint32_t        len;
 149                 } set_param;
 150                 struct msg_start_conn {
 151                         uint32_t        sid;
 152                         uint32_t        cid;
 153                 } start_conn;
 154                 struct msg_stop_conn {
 155                         uint32_t        sid;
 156                         uint32_t        cid;
 157                         uint64_t        conn_handle;
 158                         uint32_t        flag;
 159                 } stop_conn;
 160                 struct msg_get_stats {
 161                         uint32_t        sid;
 162                         uint32_t        cid;
 163                 } get_stats;
 164                 struct msg_transport_connect {
 165                         uint32_t        non_blocking;
 166                 } ep_connect;
 167                 struct msg_transport_connect_through_host {
 168                         uint32_t        host_no;
 169                         uint32_t        non_blocking;
 170                 } ep_connect_through_host;
 171                 struct msg_transport_poll {
 172                         uint64_t        ep_handle;
 173                         uint32_t        timeout_ms;
 174                 } ep_poll;
 175                 struct msg_transport_disconnect {
 176                         uint64_t        ep_handle;
 177                 } ep_disconnect;
 178                 struct msg_tgt_dscvr {
 179                         enum iscsi_tgt_dscvr    type;
 180                         uint32_t        host_no;
 181                         /*
 182                          * enable = 1 to establish a new connection
 183                          * with the server. enable = 0 to disconnect
 184                          * from the server. Used primarily to switch
 185                          * from one iSNS server to another.
 186                          */
 187                         uint32_t        enable;
 188                 } tgt_dscvr;
 189                 struct msg_set_host_param {
 190                         uint32_t        host_no;
 191                         uint32_t        param; /* enum iscsi_host_param */
 192                         uint32_t        len;
 193                 } set_host_param;
 194                 struct msg_set_path {
 195                         uint32_t        host_no;
 196                 } set_path;
 197                 struct msg_set_iface_params {
 198                         uint32_t        host_no;
 199                         uint32_t        count;
 200                 } set_iface_params;
 201                 struct msg_iscsi_ping {
 202                         uint32_t        host_no;
 203                         uint32_t        iface_num;
 204                         uint32_t        iface_type;
 205                         uint32_t        payload_size;
 206                         uint32_t        pid;    /* unique ping id associated
 207                                                    with each ping request */
 208                 } iscsi_ping;
 209                 struct msg_get_chap {
 210                         uint32_t        host_no;
 211                         uint32_t        num_entries; /* number of CHAP entries
 212                                                       * on request, number of
 213                                                       * valid CHAP entries on
 214                                                       * response */
 215                         uint16_t        chap_tbl_idx;
 216                 } get_chap;
 217                 struct msg_delete_chap {
 218                        uint32_t        host_no;
 219                        uint16_t        chap_tbl_idx;
 220                 } delete_chap;
 221                 struct msg_set_flashnode_param {
 222                         uint32_t        host_no;
 223                         uint32_t        flashnode_idx;
 224                         uint32_t        count;
 225                 } set_flashnode;
 226                 struct msg_new_flashnode {
 227                         uint32_t        host_no;
 228                         uint32_t        len;
 229                 } new_flashnode;
 230                 struct msg_del_flashnode {
 231                         uint32_t        host_no;
 232                         uint32_t        flashnode_idx;
 233                 } del_flashnode;
 234                 struct msg_login_flashnode {
 235                         uint32_t        host_no;
 236                         uint32_t        flashnode_idx;
 237                 } login_flashnode;
 238                 struct msg_logout_flashnode {
 239                         uint32_t        host_no;
 240                         uint32_t        flashnode_idx;
 241                 } logout_flashnode;
 242                 struct msg_logout_flashnode_sid {
 243                         uint32_t        host_no;
 244                         uint32_t        sid;
 245                 } logout_flashnode_sid;
 246                 struct msg_get_host_stats {
 247                         uint32_t host_no;
 248                 } get_host_stats;
 249         } u;
 250         union {
 251                 /* messages k -> u */
 252                 int                     retcode;
 253                 struct msg_create_session_ret {
 254                         uint32_t        sid;
 255                         uint32_t        host_no;
 256                 } c_session_ret;
 257                 struct msg_create_conn_ret {
 258                         uint32_t        sid;
 259                         uint32_t        cid;
 260                 } c_conn_ret;
 261                 struct msg_unbind_session {
 262                         uint32_t        sid;
 263                         uint32_t        host_no;
 264                 } unbind_session;
 265                 struct msg_recv_req {
 266                         uint32_t        sid;
 267                         uint32_t        cid;
 268                         uint64_t        recv_handle;
 269                 } recv_req;
 270                 struct msg_conn_login {
 271                         uint32_t        sid;
 272                         uint32_t        cid;
 273                         uint32_t        state; /* enum iscsi_conn_state */
 274                 } conn_login;
 275                 struct msg_conn_error {
 276                         uint32_t        sid;
 277                         uint32_t        cid;
 278                         uint32_t        error; /* enum iscsi_err */
 279                 } connerror;
 280                 struct msg_session_destroyed {
 281                         uint32_t        host_no;
 282                         uint32_t        sid;
 283                 } d_session;
 284                 struct msg_transport_connect_ret {
 285                         uint64_t        handle;
 286                 } ep_connect_ret;
 287                 struct msg_req_path {
 288                         uint32_t        host_no;
 289                 } req_path;
 290                 struct msg_notify_if_down {
 291                         uint32_t        host_no;
 292                 } notify_if_down;
 293                 struct msg_host_event {
 294                         uint32_t        host_no;
 295                         uint32_t        data_size;
 296                         enum iscsi_host_event_code code;
 297                 } host_event;
 298                 struct msg_ping_comp {
 299                         uint32_t        host_no;
 300                         uint32_t        status; /* enum
 301                                                  * iscsi_ping_status_code */
 302                         uint32_t        pid;    /* unique ping id associated
 303                                                    with each ping request */
 304                         uint32_t        data_size;
 305                 } ping_comp;
 306                 struct msg_new_flashnode_ret {
 307                         uint32_t        flashnode_idx;
 308                 } new_flashnode_ret;
 309         } r;
 310 } __attribute__ ((aligned (sizeof(uint64_t))));
 311
 312 enum iscsi_param_type {
 313         ISCSI_PARAM,            /* iscsi_param (session, conn, target, LU) */
 314         ISCSI_HOST_PARAM,       /* iscsi_host_param */
 315         ISCSI_NET_PARAM,        /* iscsi_net_param */
 316         ISCSI_FLASHNODE_PARAM,  /* iscsi_flashnode_param */
 317         ISCSI_CHAP_PARAM,       /* iscsi_chap_param */
 318         ISCSI_IFACE_PARAM,      /* iscsi_iface_param */
 319 };
 320
 321 /* structure for minimalist usecase */
 322 struct iscsi_param_info {
 323         uint32_t len;           /* Actual length of the param value */
 324         uint16_t param;         /* iscsi param */
 325         uint8_t value[0];       /* length sized value follows */
 326 } __packed;
 327
 328 struct iscsi_iface_param_info {
 329         uint32_t iface_num;     /* iface number, 0 - n */
 330         uint32_t len;           /* Actual length of the param */
 331         uint16_t param;         /* iscsi param value */
 332         uint8_t iface_type;     /* IPv4 or IPv6 */
 333         uint8_t param_type;     /* iscsi_param_type */
 334         uint8_t value[0];       /* length sized value follows */
 335 } __packed;
 336
 337 /*
 338  * To keep the struct iscsi_uevent size the same for userspace code
 339  * compatibility, the main structure for ISCSI_UEVENT_PATH_UPDATE and
 340  * ISCSI_KEVENT_PATH_REQ is defined separately and comes after the
 341  * struct iscsi_uevent in the NETLINK_ISCSI message.
 342  */
 343 struct iscsi_path {
 344         uint64_t        handle;
 345         uint8_t         mac_addr[6];
 346         uint8_t         mac_addr_old[6];
 347         uint32_t        ip_addr_len;    /* 4 or 16 */
 348         union {
 349                 struct in_addr  v4_addr;
 350                 struct in6_addr v6_addr;
 351         } src;
 352         union {
 353                 struct in_addr  v4_addr;
 354                 struct in6_addr v6_addr;
 355         } dst;
 356         uint16_t        vlan_id;
 357         uint16_t        pmtu;
 358 } __attribute__ ((aligned (sizeof(uint64_t))));
 359
 360 /* iscsi iface enabled/disabled setting */
 361 #define ISCSI_IFACE_DISABLE     0x01
 362 #define ISCSI_IFACE_ENABLE      0x02
 363
 364 /* ipv4 bootproto */
 365 #define ISCSI_BOOTPROTO_STATIC          0x01
 366 #define ISCSI_BOOTPROTO_DHCP            0x02
 367
 368 /* ipv6 addr autoconfig type */
 369 #define ISCSI_IPV6_AUTOCFG_DISABLE              0x01
 370 #define ISCSI_IPV6_AUTOCFG_ND_ENABLE            0x02
 371 #define ISCSI_IPV6_AUTOCFG_DHCPV6_ENABLE        0x03
 372
 373 /* ipv6 link local addr type */
 374 #define ISCSI_IPV6_LINKLOCAL_AUTOCFG_ENABLE     0x01
 375 #define ISCSI_IPV6_LINKLOCAL_AUTOCFG_DISABLE    0x02
 376
 377 /* ipv6 router addr type */
 378 #define ISCSI_IPV6_ROUTER_AUTOCFG_ENABLE        0x01
 379 #define ISCSI_IPV6_ROUTER_AUTOCFG_DISABLE       0x02
 380
 381 #define ISCSI_IFACE_TYPE_IPV4           0x01
 382 #define ISCSI_IFACE_TYPE_IPV6           0x02
 383
 384 #define ISCSI_MAX_VLAN_ID               4095
 385 #define ISCSI_MAX_VLAN_PRIORITY         7
 386
 387 /* iscsi vlan enable/disabled setting */
 388 #define ISCSI_VLAN_DISABLE      0x01
 389 #define ISCSI_VLAN_ENABLE       0x02
 390
 391 /* iscsi generic enable/disabled setting for various features */
 392 #define ISCSI_NET_PARAM_DISABLE         0x01
 393 #define ISCSI_NET_PARAM_ENABLE          0x02
 394
 395 /* iSCSI network params */
 396 enum iscsi_net_param {
 397         ISCSI_NET_PARAM_IPV4_ADDR               = 1,
 398         ISCSI_NET_PARAM_IPV4_SUBNET,
 399         ISCSI_NET_PARAM_IPV4_GW,
 400         ISCSI_NET_PARAM_IPV4_BOOTPROTO,
 401         ISCSI_NET_PARAM_MAC,
 402         ISCSI_NET_PARAM_IPV6_LINKLOCAL,
 403         ISCSI_NET_PARAM_IPV6_ADDR,
 404         ISCSI_NET_PARAM_IPV6_ROUTER,
 405         ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG,
 406         ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG,
 407         ISCSI_NET_PARAM_IPV6_ROUTER_AUTOCFG,
 408         ISCSI_NET_PARAM_IFACE_ENABLE,
 409         ISCSI_NET_PARAM_VLAN_ID,
 410         ISCSI_NET_PARAM_VLAN_PRIORITY,
 411         ISCSI_NET_PARAM_VLAN_ENABLED,
 412         ISCSI_NET_PARAM_VLAN_TAG,
 413         ISCSI_NET_PARAM_IFACE_TYPE,
 414         ISCSI_NET_PARAM_IFACE_NAME,
 415         ISCSI_NET_PARAM_MTU,
 416         ISCSI_NET_PARAM_PORT,
 417         ISCSI_NET_PARAM_IPADDR_STATE,
 418         ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE,
 419         ISCSI_NET_PARAM_IPV6_ROUTER_STATE,
 420         ISCSI_NET_PARAM_DELAYED_ACK_EN,
 421         ISCSI_NET_PARAM_TCP_NAGLE_DISABLE,
 422         ISCSI_NET_PARAM_TCP_WSF_DISABLE,
 423         ISCSI_NET_PARAM_TCP_WSF,
 424         ISCSI_NET_PARAM_TCP_TIMER_SCALE,
 425         ISCSI_NET_PARAM_TCP_TIMESTAMP_EN,
 426         ISCSI_NET_PARAM_CACHE_ID,
 427         ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN,
 428         ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN,
 429         ISCSI_NET_PARAM_IPV4_TOS_EN,
 430         ISCSI_NET_PARAM_IPV4_TOS,
 431         ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN,
 432         ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN,
 433         ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID,
 434         ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN,
 435         ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN,
 436         ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID,
 437         ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN,
 438         ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE,
 439         ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN,
 440         ISCSI_NET_PARAM_IPV4_TTL,
 441         ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN,
 442         ISCSI_NET_PARAM_IPV6_MLD_EN,
 443         ISCSI_NET_PARAM_IPV6_FLOW_LABEL,
 444         ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS,
 445         ISCSI_NET_PARAM_IPV6_HOP_LIMIT,
 446         ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO,
 447         ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME,
 448         ISCSI_NET_PARAM_IPV6_ND_STALE_TMO,
 449         ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT,
 450         ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU,
 451         ISCSI_NET_PARAM_REDIRECT_EN,
 452 };
 453
 454 enum iscsi_ipaddress_state {
 455         ISCSI_IPDDRESS_STATE_UNCONFIGURED,
 456         ISCSI_IPDDRESS_STATE_ACQUIRING,
 457         ISCSI_IPDDRESS_STATE_TENTATIVE,
 458         ISCSI_IPDDRESS_STATE_VALID,
 459         ISCSI_IPDDRESS_STATE_DISABLING,
 460         ISCSI_IPDDRESS_STATE_INVALID,
 461         ISCSI_IPDDRESS_STATE_DEPRECATED,
 462 };
 463
 464 enum iscsi_router_state {
 465         ISCSI_ROUTER_STATE_UNKNOWN,
 466         ISCSI_ROUTER_STATE_ADVERTISED,
 467         ISCSI_ROUTER_STATE_MANUAL,
 468         ISCSI_ROUTER_STATE_STALE,
 469 };
 470
 471 /* iSCSI specific settings params for iface */
 472 enum iscsi_iface_param {
 473         ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO,
 474         ISCSI_IFACE_PARAM_HDRDGST_EN,
 475         ISCSI_IFACE_PARAM_DATADGST_EN,
 476         ISCSI_IFACE_PARAM_IMM_DATA_EN,
 477         ISCSI_IFACE_PARAM_INITIAL_R2T_EN,
 478         ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN,
 479         ISCSI_IFACE_PARAM_PDU_INORDER_EN,
 480         ISCSI_IFACE_PARAM_ERL,
 481         ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH,
 482         ISCSI_IFACE_PARAM_FIRST_BURST,
 483         ISCSI_IFACE_PARAM_MAX_R2T,
 484         ISCSI_IFACE_PARAM_MAX_BURST,
 485         ISCSI_IFACE_PARAM_CHAP_AUTH_EN,
 486         ISCSI_IFACE_PARAM_BIDI_CHAP_EN,
 487         ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL,
 488         ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN,
 489         ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN,
 490         ISCSI_IFACE_PARAM_INITIATOR_NAME,
 491 };
 492
 493 enum iscsi_conn_state {
 494         ISCSI_CONN_STATE_FREE,
 495         ISCSI_CONN_STATE_XPT_WAIT,
 496         ISCSI_CONN_STATE_IN_LOGIN,
 497         ISCSI_CONN_STATE_LOGGED_IN,
 498         ISCSI_CONN_STATE_IN_LOGOUT,
 499         ISCSI_CONN_STATE_LOGOUT_REQUESTED,
 500         ISCSI_CONN_STATE_CLEANUP_WAIT,
 501 };
 502
 503 /*
 504  * Common error codes
 505  */
 506 enum iscsi_err {
 507         ISCSI_OK                        = 0,
 508
 509         ISCSI_ERR_DATASN                = ISCSI_ERR_BASE + 1,
 510         ISCSI_ERR_DATA_OFFSET           = ISCSI_ERR_BASE + 2,
 511         ISCSI_ERR_MAX_CMDSN             = ISCSI_ERR_BASE + 3,
 512         ISCSI_ERR_EXP_CMDSN             = ISCSI_ERR_BASE + 4,
 513         ISCSI_ERR_BAD_OPCODE            = ISCSI_ERR_BASE + 5,
 514         ISCSI_ERR_DATALEN               = ISCSI_ERR_BASE + 6,
 515         ISCSI_ERR_AHSLEN                = ISCSI_ERR_BASE + 7,
 516         ISCSI_ERR_PROTO                 = ISCSI_ERR_BASE + 8,
 517         ISCSI_ERR_LUN                   = ISCSI_ERR_BASE + 9,
 518         ISCSI_ERR_BAD_ITT               = ISCSI_ERR_BASE + 10,
 519         ISCSI_ERR_CONN_FAILED           = ISCSI_ERR_BASE + 11,
 520         ISCSI_ERR_R2TSN                 = ISCSI_ERR_BASE + 12,
 521         ISCSI_ERR_SESSION_FAILED        = ISCSI_ERR_BASE + 13,
 522         ISCSI_ERR_HDR_DGST              = ISCSI_ERR_BASE + 14,
 523         ISCSI_ERR_DATA_DGST             = ISCSI_ERR_BASE + 15,
 524         ISCSI_ERR_PARAM_NOT_FOUND       = ISCSI_ERR_BASE + 16,
 525         ISCSI_ERR_NO_SCSI_CMD           = ISCSI_ERR_BASE + 17,
 526         ISCSI_ERR_INVALID_HOST          = ISCSI_ERR_BASE + 18,
 527         ISCSI_ERR_XMIT_FAILED           = ISCSI_ERR_BASE + 19,
 528         ISCSI_ERR_TCP_CONN_CLOSE        = ISCSI_ERR_BASE + 20,
 529         ISCSI_ERR_SCSI_EH_SESSION_RST   = ISCSI_ERR_BASE + 21,
 530         ISCSI_ERR_NOP_TIMEDOUT          = ISCSI_ERR_BASE + 22,
 531 };
 532
 533 /*
 534  * iSCSI Parameters (RFC3720)
 535  */
 536 enum iscsi_param {
 537         /* passed in using netlink set param */
 538         ISCSI_PARAM_MAX_RECV_DLENGTH,
 539         ISCSI_PARAM_MAX_XMIT_DLENGTH,
 540         ISCSI_PARAM_HDRDGST_EN,
 541         ISCSI_PARAM_DATADGST_EN,
 542         ISCSI_PARAM_INITIAL_R2T_EN,
 543         ISCSI_PARAM_MAX_R2T,
 544         ISCSI_PARAM_IMM_DATA_EN,
 545         ISCSI_PARAM_FIRST_BURST,
 546         ISCSI_PARAM_MAX_BURST,
 547         ISCSI_PARAM_PDU_INORDER_EN,
 548         ISCSI_PARAM_DATASEQ_INORDER_EN,
 549         ISCSI_PARAM_ERL,
 550         ISCSI_PARAM_IFMARKER_EN,
 551         ISCSI_PARAM_OFMARKER_EN,
 552         ISCSI_PARAM_EXP_STATSN,
 553         ISCSI_PARAM_TARGET_NAME,
 554         ISCSI_PARAM_TPGT,
 555         ISCSI_PARAM_PERSISTENT_ADDRESS,
 556         ISCSI_PARAM_PERSISTENT_PORT,
 557         ISCSI_PARAM_SESS_RECOVERY_TMO,
 558
 559         /* passed in through bind conn using transport_fd */
 560         ISCSI_PARAM_CONN_PORT,
 561         ISCSI_PARAM_CONN_ADDRESS,
 562
 563         ISCSI_PARAM_USERNAME,
 564         ISCSI_PARAM_USERNAME_IN,
 565         ISCSI_PARAM_PASSWORD,
 566         ISCSI_PARAM_PASSWORD_IN,
 567
 568         ISCSI_PARAM_FAST_ABORT,
 569         ISCSI_PARAM_ABORT_TMO,
 570         ISCSI_PARAM_LU_RESET_TMO,
 571         ISCSI_PARAM_HOST_RESET_TMO,
 572
 573         ISCSI_PARAM_PING_TMO,
 574         ISCSI_PARAM_RECV_TMO,
 575
 576         ISCSI_PARAM_IFACE_NAME,
 577         ISCSI_PARAM_ISID,
 578         ISCSI_PARAM_INITIATOR_NAME,
 579
 580         ISCSI_PARAM_TGT_RESET_TMO,
 581         ISCSI_PARAM_TARGET_ALIAS,
 582
 583         ISCSI_PARAM_CHAP_IN_IDX,
 584         ISCSI_PARAM_CHAP_OUT_IDX,
 585
 586         ISCSI_PARAM_BOOT_ROOT,
 587         ISCSI_PARAM_BOOT_NIC,
 588         ISCSI_PARAM_BOOT_TARGET,
 589
 590         ISCSI_PARAM_AUTO_SND_TGT_DISABLE,
 591         ISCSI_PARAM_DISCOVERY_SESS,
 592         ISCSI_PARAM_PORTAL_TYPE,
 593         ISCSI_PARAM_CHAP_AUTH_EN,
 594         ISCSI_PARAM_DISCOVERY_LOGOUT_EN,
 595         ISCSI_PARAM_BIDI_CHAP_EN,
 596         ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL,
 597
 598         ISCSI_PARAM_DEF_TIME2WAIT,
 599         ISCSI_PARAM_DEF_TIME2RETAIN,
 600         ISCSI_PARAM_MAX_SEGMENT_SIZE,
 601         ISCSI_PARAM_STATSN,
 602         ISCSI_PARAM_KEEPALIVE_TMO,
 603         ISCSI_PARAM_LOCAL_PORT,
 604         ISCSI_PARAM_TSID,
 605         ISCSI_PARAM_DEF_TASKMGMT_TMO,
 606
 607         ISCSI_PARAM_TCP_TIMESTAMP_STAT,
 608         ISCSI_PARAM_TCP_WSF_DISABLE,
 609         ISCSI_PARAM_TCP_NAGLE_DISABLE,
 610         ISCSI_PARAM_TCP_TIMER_SCALE,
 611         ISCSI_PARAM_TCP_TIMESTAMP_EN,
 612         ISCSI_PARAM_TCP_XMIT_WSF,
 613         ISCSI_PARAM_TCP_RECV_WSF,
 614         ISCSI_PARAM_IP_FRAGMENT_DISABLE,
 615         ISCSI_PARAM_IPV4_TOS,
 616         ISCSI_PARAM_IPV6_TC,
 617         ISCSI_PARAM_IPV6_FLOW_LABEL,
 618         ISCSI_PARAM_IS_FW_ASSIGNED_IPV6,
 619
 620         ISCSI_PARAM_DISCOVERY_PARENT_IDX,
 621         ISCSI_PARAM_DISCOVERY_PARENT_TYPE,
 622         ISCSI_PARAM_LOCAL_IPADDR,
 623         /* must always be last */
 624         ISCSI_PARAM_MAX,
 625 };
 626
 627 /* iSCSI HBA params */
 628 enum iscsi_host_param {
 629         ISCSI_HOST_PARAM_HWADDRESS,
 630         ISCSI_HOST_PARAM_INITIATOR_NAME,
 631         ISCSI_HOST_PARAM_NETDEV_NAME,
 632         ISCSI_HOST_PARAM_IPADDRESS,
 633         ISCSI_HOST_PARAM_PORT_STATE,
 634         ISCSI_HOST_PARAM_PORT_SPEED,
 635         ISCSI_HOST_PARAM_MAX,
 636 };
 637
 638 /* portal type */
 639 #define PORTAL_TYPE_IPV4        "ipv4"
 640 #define PORTAL_TYPE_IPV6        "ipv6"
 641
 642 /* iSCSI Flash Target params */
 643 enum iscsi_flashnode_param {
 644         ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6,
 645         ISCSI_FLASHNODE_PORTAL_TYPE,
 646         ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE,
 647         ISCSI_FLASHNODE_DISCOVERY_SESS,
 648         ISCSI_FLASHNODE_ENTRY_EN,
 649         ISCSI_FLASHNODE_HDR_DGST_EN,
 650         ISCSI_FLASHNODE_DATA_DGST_EN,
 651         ISCSI_FLASHNODE_IMM_DATA_EN,
 652         ISCSI_FLASHNODE_INITIAL_R2T_EN,
 653         ISCSI_FLASHNODE_DATASEQ_INORDER,
 654         ISCSI_FLASHNODE_PDU_INORDER,
 655         ISCSI_FLASHNODE_CHAP_AUTH_EN,
 656         ISCSI_FLASHNODE_SNACK_REQ_EN,
 657         ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN,
 658         ISCSI_FLASHNODE_BIDI_CHAP_EN,
 659         /* make authentication for discovery sessions optional */
 660         ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL,
 661         ISCSI_FLASHNODE_ERL,
 662         ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT,
 663         ISCSI_FLASHNODE_TCP_NAGLE_DISABLE,
 664         ISCSI_FLASHNODE_TCP_WSF_DISABLE,
 665         ISCSI_FLASHNODE_TCP_TIMER_SCALE,
 666         ISCSI_FLASHNODE_TCP_TIMESTAMP_EN,
 667         ISCSI_FLASHNODE_IP_FRAG_DISABLE,
 668         ISCSI_FLASHNODE_MAX_RECV_DLENGTH,
 669         ISCSI_FLASHNODE_MAX_XMIT_DLENGTH,
 670         ISCSI_FLASHNODE_FIRST_BURST,
 671         ISCSI_FLASHNODE_DEF_TIME2WAIT,
 672         ISCSI_FLASHNODE_DEF_TIME2RETAIN,
 673         ISCSI_FLASHNODE_MAX_R2T,
 674         ISCSI_FLASHNODE_KEEPALIVE_TMO,
 675         ISCSI_FLASHNODE_ISID,
 676         ISCSI_FLASHNODE_TSID,
 677         ISCSI_FLASHNODE_PORT,
 678         ISCSI_FLASHNODE_MAX_BURST,
 679         ISCSI_FLASHNODE_DEF_TASKMGMT_TMO,
 680         ISCSI_FLASHNODE_IPADDR,
 681         ISCSI_FLASHNODE_ALIAS,
 682         ISCSI_FLASHNODE_REDIRECT_IPADDR,
 683         ISCSI_FLASHNODE_MAX_SEGMENT_SIZE,
 684         ISCSI_FLASHNODE_LOCAL_PORT,
 685         ISCSI_FLASHNODE_IPV4_TOS,
 686         ISCSI_FLASHNODE_IPV6_TC,
 687         ISCSI_FLASHNODE_IPV6_FLOW_LABEL,
 688         ISCSI_FLASHNODE_NAME,
 689         ISCSI_FLASHNODE_TPGT,
 690         ISCSI_FLASHNODE_LINK_LOCAL_IPV6,
 691         ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX,
 692         ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE,
 693         ISCSI_FLASHNODE_TCP_XMIT_WSF,
 694         ISCSI_FLASHNODE_TCP_RECV_WSF,
 695         ISCSI_FLASHNODE_CHAP_IN_IDX,
 696         ISCSI_FLASHNODE_CHAP_OUT_IDX,
 697         ISCSI_FLASHNODE_USERNAME,
 698         ISCSI_FLASHNODE_USERNAME_IN,
 699         ISCSI_FLASHNODE_PASSWORD,
 700         ISCSI_FLASHNODE_PASSWORD_IN,
 701         ISCSI_FLASHNODE_STATSN,
 702         ISCSI_FLASHNODE_EXP_STATSN,
 703         ISCSI_FLASHNODE_IS_BOOT_TGT,
 704
 705         ISCSI_FLASHNODE_MAX,
 706 };
 707
 708 struct iscsi_flashnode_param_info {
 709         uint32_t len;           /* Actual length of the param */
 710         uint16_t param;         /* iscsi param value */
 711         uint8_t value[0];       /* length sized value follows */
 712 } __packed;
 713
 714 enum iscsi_discovery_parent_type {
 715         ISCSI_DISC_PARENT_UNKNOWN       = 0x1,
 716         ISCSI_DISC_PARENT_SENDTGT       = 0x2,
 717         ISCSI_DISC_PARENT_ISNS          = 0x3,
 718 };
 719
 720 /* iSCSI port Speed */
 721 enum iscsi_port_speed {
 722         ISCSI_PORT_SPEED_UNKNOWN        = 0x1,
 723         ISCSI_PORT_SPEED_10MBPS         = 0x2,
 724         ISCSI_PORT_SPEED_100MBPS        = 0x4,
 725         ISCSI_PORT_SPEED_1GBPS          = 0x8,
 726         ISCSI_PORT_SPEED_10GBPS         = 0x10,
 727         ISCSI_PORT_SPEED_25GBPS         = 0x20,
 728         ISCSI_PORT_SPEED_40GBPS         = 0x40,
 729 };
 730
 731 /* iSCSI port state */
 732 enum iscsi_port_state {
 733         ISCSI_PORT_STATE_DOWN           = 0x1,
 734         ISCSI_PORT_STATE_UP             = 0x2,
 735 };
 736
 737 /* iSCSI PING status/error code */
 738 enum iscsi_ping_status_code {
 739         ISCSI_PING_SUCCESS                      = 0,
 740         ISCSI_PING_FW_DISABLED                  = 0x1,
 741         ISCSI_PING_IPADDR_INVALID               = 0x2,
 742         ISCSI_PING_LINKLOCAL_IPV6_ADDR_INVALID  = 0x3,
 743         ISCSI_PING_TIMEOUT                      = 0x4,
 744         ISCSI_PING_INVALID_DEST_ADDR            = 0x5,
 745         ISCSI_PING_OVERSIZE_PACKET              = 0x6,
 746         ISCSI_PING_ICMP_ERROR                   = 0x7,
 747         ISCSI_PING_MAX_REQ_EXCEEDED             = 0x8,
 748         ISCSI_PING_NO_ARP_RECEIVED              = 0x9,
 749 };
 750
 751 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 752 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
 753
 754 /*
 755  * These flags presents iSCSI Data-Path capabilities.
 756  */
 757 #define CAP_RECOVERY_L0         0x1
 758 #define CAP_RECOVERY_L1         0x2
 759 #define CAP_RECOVERY_L2         0x4
 760 #define CAP_MULTI_R2T           0x8
 761 #define CAP_HDRDGST             0x10
 762 #define CAP_DATADGST            0x20
 763 #define CAP_MULTI_CONN          0x40
 764 #define CAP_TEXT_NEGO           0x80
 765 #define CAP_MARKERS             0x100
 766 #define CAP_FW_DB               0x200
 767 #define CAP_SENDTARGETS_OFFLOAD 0x400   /* offload discovery process */
 768 #define CAP_DATA_PATH_OFFLOAD   0x800   /* offload entire IO path */
 769 #define CAP_DIGEST_OFFLOAD      0x1000  /* offload hdr and data digests */
 770 #define CAP_PADDING_OFFLOAD     0x2000  /* offload padding insertion, removal,
 771                                          and verification */
 772 #define CAP_LOGIN_OFFLOAD       0x4000  /* offload session login */
 773
 774 /*
 775  * These flags describes reason of stop_conn() call
 776  */
 777 #define STOP_CONN_TERM          0x1
 778 #define STOP_CONN_SUSPEND       0x2
 779 #define STOP_CONN_RECOVER       0x3
 780
 781 #define ISCSI_STATS_CUSTOM_MAX          32
 782 #define ISCSI_STATS_CUSTOM_DESC_MAX     64
 783 struct iscsi_stats_custom {
 784         char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
 785         uint64_t value;
 786 };
 787
 788 /*
 789  * struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
 790  *
 791  * Note: this structure contains counters collected on per-connection basis.
 792  */
 793 struct iscsi_stats {
 794         /* octets */
 795         uint64_t txdata_octets;
 796         uint64_t rxdata_octets;
 797
 798         /* xmit pdus */
 799         uint32_t noptx_pdus;
 800         uint32_t scsicmd_pdus;
 801         uint32_t tmfcmd_pdus;
 802         uint32_t login_pdus;
 803         uint32_t text_pdus;
 804         uint32_t dataout_pdus;
 805         uint32_t logout_pdus;
 806         uint32_t snack_pdus;
 807
 808         /* recv pdus */
 809         uint32_t noprx_pdus;
 810         uint32_t scsirsp_pdus;
 811         uint32_t tmfrsp_pdus;
 812         uint32_t textrsp_pdus;
 813         uint32_t datain_pdus;
 814         uint32_t logoutrsp_pdus;
 815         uint32_t r2t_pdus;
 816         uint32_t async_pdus;
 817         uint32_t rjt_pdus;
 818
 819         /* errors */
 820         uint32_t digest_err;
 821         uint32_t timeout_err;
 822
 823         /*
 824          * iSCSI Custom Statistics support, i.e. Transport could
 825          * extend existing MIB statistics with its own specific statistics
 826          * up to ISCSI_STATS_CUSTOM_MAX
 827          */
 828         uint32_t custom_length;
 829         struct iscsi_stats_custom custom[0]
 830                 __attribute__ ((aligned (sizeof(uint64_t))));
 831 };
 832
 833 enum chap_type_e {
 834         CHAP_TYPE_OUT,
 835         CHAP_TYPE_IN,
 836 };
 837
 838 enum iscsi_chap_param {
 839         ISCSI_CHAP_PARAM_INDEX,
 840         ISCSI_CHAP_PARAM_CHAP_TYPE,
 841         ISCSI_CHAP_PARAM_USERNAME,
 842         ISCSI_CHAP_PARAM_PASSWORD,
 843         ISCSI_CHAP_PARAM_PASSWORD_LEN
 844 };
 845
 846 #define ISCSI_CHAP_AUTH_NAME_MAX_LEN    256
 847 #define ISCSI_CHAP_AUTH_SECRET_MAX_LEN  256
 848 struct iscsi_chap_rec {
 849         uint16_t chap_tbl_idx;
 850         enum chap_type_e chap_type;
 851         char username[ISCSI_CHAP_AUTH_NAME_MAX_LEN];
 852         uint8_t password[ISCSI_CHAP_AUTH_SECRET_MAX_LEN];
 853         uint8_t password_length;
 854 };
 855
 856 #define ISCSI_HOST_STATS_CUSTOM_MAX             32
 857 #define ISCSI_HOST_STATS_CUSTOM_DESC_MAX        64
 858 struct iscsi_host_stats_custom {
 859         char desc[ISCSI_HOST_STATS_CUSTOM_DESC_MAX];
 860         uint64_t value;
 861 };
 862
 863 /* struct iscsi_offload_host_stats: Host statistics,
 864  * Include statistics for MAC, IP, TCP & iSCSI.
 865  */
 866 struct iscsi_offload_host_stats {
 867         /* MAC */
 868         uint64_t mactx_frames;
 869         uint64_t mactx_bytes;
 870         uint64_t mactx_multicast_frames;
 871         uint64_t mactx_broadcast_frames;
 872         uint64_t mactx_pause_frames;
 873         uint64_t mactx_control_frames;
 874         uint64_t mactx_deferral;
 875         uint64_t mactx_excess_deferral;
 876         uint64_t mactx_late_collision;
 877         uint64_t mactx_abort;
 878         uint64_t mactx_single_collision;
 879         uint64_t mactx_multiple_collision;
 880         uint64_t mactx_collision;
 881         uint64_t mactx_frames_dropped;
 882         uint64_t mactx_jumbo_frames;
 883         uint64_t macrx_frames;
 884         uint64_t macrx_bytes;
 885         uint64_t macrx_unknown_control_frames;
 886         uint64_t macrx_pause_frames;
 887         uint64_t macrx_control_frames;
 888         uint64_t macrx_dribble;
 889         uint64_t macrx_frame_length_error;
 890         uint64_t macrx_jabber;
 891         uint64_t macrx_carrier_sense_error;
 892         uint64_t macrx_frame_discarded;
 893         uint64_t macrx_frames_dropped;
 894         uint64_t mac_crc_error;
 895         uint64_t mac_encoding_error;
 896         uint64_t macrx_length_error_large;
 897         uint64_t macrx_length_error_small;
 898         uint64_t macrx_multicast_frames;
 899         uint64_t macrx_broadcast_frames;
 900         /* IP */
 901         uint64_t iptx_packets;
 902         uint64_t iptx_bytes;
 903         uint64_t iptx_fragments;
 904         uint64_t iprx_packets;
 905         uint64_t iprx_bytes;
 906         uint64_t iprx_fragments;
 907         uint64_t ip_datagram_reassembly;
 908         uint64_t ip_invalid_address_error;
 909         uint64_t ip_error_packets;
 910         uint64_t ip_fragrx_overlap;
 911         uint64_t ip_fragrx_outoforder;
 912         uint64_t ip_datagram_reassembly_timeout;
 913         uint64_t ipv6tx_packets;
 914         uint64_t ipv6tx_bytes;
 915         uint64_t ipv6tx_fragments;
 916         uint64_t ipv6rx_packets;
 917         uint64_t ipv6rx_bytes;
 918         uint64_t ipv6rx_fragments;
 919         uint64_t ipv6_datagram_reassembly;
 920         uint64_t ipv6_invalid_address_error;
 921         uint64_t ipv6_error_packets;
 922         uint64_t ipv6_fragrx_overlap;
 923         uint64_t ipv6_fragrx_outoforder;
 924         uint64_t ipv6_datagram_reassembly_timeout;
 925         /* TCP */
 926         uint64_t tcptx_segments;
 927         uint64_t tcptx_bytes;
 928         uint64_t tcprx_segments;
 929         uint64_t tcprx_byte;
 930         uint64_t tcp_duplicate_ack_retx;
 931         uint64_t tcp_retx_timer_expired;
 932         uint64_t tcprx_duplicate_ack;
 933         uint64_t tcprx_pure_ackr;
 934         uint64_t tcptx_delayed_ack;
 935         uint64_t tcptx_pure_ack;
 936         uint64_t tcprx_segment_error;
 937         uint64_t tcprx_segment_outoforder;
 938         uint64_t tcprx_window_probe;
 939         uint64_t tcprx_window_update;
 940         uint64_t tcptx_window_probe_persist;
 941         /* ECC */
 942         uint64_t ecc_error_correction;
 943         /* iSCSI */
 944         uint64_t iscsi_pdu_tx;
 945         uint64_t iscsi_data_bytes_tx;
 946         uint64_t iscsi_pdu_rx;
 947         uint64_t iscsi_data_bytes_rx;
 948         uint64_t iscsi_io_completed;
 949         uint64_t iscsi_unexpected_io_rx;
 950         uint64_t iscsi_format_error;
 951         uint64_t iscsi_hdr_digest_error;
 952         uint64_t iscsi_data_digest_error;
 953         uint64_t iscsi_sequence_error;
 954         /*
 955          * iSCSI Custom Host Statistics support, i.e. Transport could
 956          * extend existing host statistics with its own specific statistics
 957          * up to ISCSI_HOST_STATS_CUSTOM_MAX
 958          */
 959         uint32_t custom_length;
 960         struct iscsi_host_stats_custom custom[0]
 961                 __aligned(sizeof(uint64_t));
 962 };
 963
 964 #endif