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
  63         /* up events */
  64         ISCSI_KEVENT_RECV_PDU           = KEVENT_BASE + 1,
  65         ISCSI_KEVENT_CONN_ERROR         = KEVENT_BASE + 2,
  66         ISCSI_KEVENT_IF_ERROR           = KEVENT_BASE + 3,
  67         ISCSI_KEVENT_DESTROY_SESSION    = KEVENT_BASE + 4,
  68         ISCSI_KEVENT_UNBIND_SESSION     = KEVENT_BASE + 5,
  69         ISCSI_KEVENT_CREATE_SESSION     = KEVENT_BASE + 6,
  70
  71         ISCSI_KEVENT_PATH_REQ           = KEVENT_BASE + 7,
  72         ISCSI_KEVENT_IF_DOWN            = KEVENT_BASE + 8,
  73 };
  74
  75 enum iscsi_tgt_dscvr {
  76         ISCSI_TGT_DSCVR_SEND_TARGETS    = 1,
  77         ISCSI_TGT_DSCVR_ISNS            = 2,
  78         ISCSI_TGT_DSCVR_SLP             = 3,
  79 };
  80
  81 struct iscsi_uevent {
  82         uint32_t type; /* k/u events type */
  83         uint32_t iferror; /* carries interface or resource errors */
  84         uint64_t transport_handle;
  85
  86         union {
  87                 /* messages u -> k */
  88                 struct msg_create_session {
  89                         uint32_t        initial_cmdsn;
  90                         uint16_t        cmds_max;
  91                         uint16_t        queue_depth;
  92                 } c_session;
  93                 struct msg_create_bound_session {
  94                         uint64_t        ep_handle;
  95                         uint32_t        initial_cmdsn;
  96                         uint16_t        cmds_max;
  97                         uint16_t        queue_depth;
  98                 } c_bound_session;
  99                 struct msg_destroy_session {
 100                         uint32_t        sid;
 101                 } d_session;
 102                 struct msg_create_conn {
 103                         uint32_t        sid;
 104                         uint32_t        cid;
 105                 } c_conn;
 106                 struct msg_bind_conn {
 107                         uint32_t        sid;
 108                         uint32_t        cid;
 109                         uint64_t        transport_eph;
 110                         uint32_t        is_leading;
 111                 } b_conn;
 112                 struct msg_destroy_conn {
 113                         uint32_t        sid;
 114                         uint32_t        cid;
 115                 } d_conn;
 116                 struct msg_send_pdu {
 117                         uint32_t        sid;
 118                         uint32_t        cid;
 119                         uint32_t        hdr_size;
 120                         uint32_t        data_size;
 121                 } send_pdu;
 122                 struct msg_set_param {
 123                         uint32_t        sid;
 124                         uint32_t        cid;
 125                         uint32_t        param; /* enum iscsi_param */
 126                         uint32_t        len;
 127                 } set_param;
 128                 struct msg_start_conn {
 129                         uint32_t        sid;
 130                         uint32_t        cid;
 131                 } start_conn;
 132                 struct msg_stop_conn {
 133                         uint32_t        sid;
 134                         uint32_t        cid;
 135                         uint64_t        conn_handle;
 136                         uint32_t        flag;
 137                 } stop_conn;
 138                 struct msg_get_stats {
 139                         uint32_t        sid;
 140                         uint32_t        cid;
 141                 } get_stats;
 142                 struct msg_transport_connect {
 143                         uint32_t        non_blocking;
 144                 } ep_connect;
 145                 struct msg_transport_connect_through_host {
 146                         uint32_t        host_no;
 147                         uint32_t        non_blocking;
 148                 } ep_connect_through_host;
 149                 struct msg_transport_poll {
 150                         uint64_t        ep_handle;
 151                         uint32_t        timeout_ms;
 152                 } ep_poll;
 153                 struct msg_transport_disconnect {
 154                         uint64_t        ep_handle;
 155                 } ep_disconnect;
 156                 struct msg_tgt_dscvr {
 157                         enum iscsi_tgt_dscvr    type;
 158                         uint32_t        host_no;
 159                         /*
 160                          * enable = 1 to establish a new connection
 161                          * with the server. enable = 0 to disconnect
 162                          * from the server. Used primarily to switch
 163                          * from one iSNS server to another.
 164                          */
 165                         uint32_t        enable;
 166                 } tgt_dscvr;
 167                 struct msg_set_host_param {
 168                         uint32_t        host_no;
 169                         uint32_t        param; /* enum iscsi_host_param */
 170                         uint32_t        len;
 171                 } set_host_param;
 172                 struct msg_set_path {
 173                         uint32_t        host_no;
 174                 } set_path;
 175         } u;
 176         union {
 177                 /* messages k -> u */
 178                 int                     retcode;
 179                 struct msg_create_session_ret {
 180                         uint32_t        sid;
 181                         uint32_t        host_no;
 182                 } c_session_ret;
 183                 struct msg_create_conn_ret {
 184                         uint32_t        sid;
 185                         uint32_t        cid;
 186                 } c_conn_ret;
 187                 struct msg_unbind_session {
 188                         uint32_t        sid;
 189                         uint32_t        host_no;
 190                 } unbind_session;
 191                 struct msg_recv_req {
 192                         uint32_t        sid;
 193                         uint32_t        cid;
 194                         uint64_t        recv_handle;
 195                 } recv_req;
 196                 struct msg_conn_error {
 197                         uint32_t        sid;
 198                         uint32_t        cid;
 199                         uint32_t        error; /* enum iscsi_err */
 200                 } connerror;
 201                 struct msg_session_destroyed {
 202                         uint32_t        host_no;
 203                         uint32_t        sid;
 204                 } d_session;
 205                 struct msg_transport_connect_ret {
 206                         uint64_t        handle;
 207                 } ep_connect_ret;
 208                 struct msg_req_path {
 209                         uint32_t        host_no;
 210                 } req_path;
 211                 struct msg_notify_if_down {
 212                         uint32_t        host_no;
 213                 } notify_if_down;
 214         } r;
 215 } __attribute__ ((aligned (sizeof(uint64_t))));
 216
 217 /*
 218  * To keep the struct iscsi_uevent size the same for userspace code
 219  * compatibility, the main structure for ISCSI_UEVENT_PATH_UPDATE and
 220  * ISCSI_KEVENT_PATH_REQ is defined separately and comes after the
 221  * struct iscsi_uevent in the NETLINK_ISCSI message.
 222  */
 223 struct iscsi_path {
 224         uint64_t        handle;
 225         uint8_t         mac_addr[6];
 226         uint8_t         mac_addr_old[6];
 227         uint32_t        ip_addr_len;    /* 4 or 16 */
 228         union {
 229                 struct in_addr  v4_addr;
 230                 struct in6_addr v6_addr;
 231         } src;
 232         union {
 233                 struct in_addr  v4_addr;
 234                 struct in6_addr v6_addr;
 235         } dst;
 236         uint16_t        vlan_id;
 237         uint16_t        pmtu;
 238 } __attribute__ ((aligned (sizeof(uint64_t))));
 239
 240 /*
 241  * Common error codes
 242  */
 243 enum iscsi_err {
 244         ISCSI_OK                        = 0,
 245
 246         ISCSI_ERR_DATASN                = ISCSI_ERR_BASE + 1,
 247         ISCSI_ERR_DATA_OFFSET           = ISCSI_ERR_BASE + 2,
 248         ISCSI_ERR_MAX_CMDSN             = ISCSI_ERR_BASE + 3,
 249         ISCSI_ERR_EXP_CMDSN             = ISCSI_ERR_BASE + 4,
 250         ISCSI_ERR_BAD_OPCODE            = ISCSI_ERR_BASE + 5,
 251         ISCSI_ERR_DATALEN               = ISCSI_ERR_BASE + 6,
 252         ISCSI_ERR_AHSLEN                = ISCSI_ERR_BASE + 7,
 253         ISCSI_ERR_PROTO                 = ISCSI_ERR_BASE + 8,
 254         ISCSI_ERR_LUN                   = ISCSI_ERR_BASE + 9,
 255         ISCSI_ERR_BAD_ITT               = ISCSI_ERR_BASE + 10,
 256         ISCSI_ERR_CONN_FAILED           = ISCSI_ERR_BASE + 11,
 257         ISCSI_ERR_R2TSN                 = ISCSI_ERR_BASE + 12,
 258         ISCSI_ERR_SESSION_FAILED        = ISCSI_ERR_BASE + 13,
 259         ISCSI_ERR_HDR_DGST              = ISCSI_ERR_BASE + 14,
 260         ISCSI_ERR_DATA_DGST             = ISCSI_ERR_BASE + 15,
 261         ISCSI_ERR_PARAM_NOT_FOUND       = ISCSI_ERR_BASE + 16,
 262         ISCSI_ERR_NO_SCSI_CMD           = ISCSI_ERR_BASE + 17,
 263         ISCSI_ERR_INVALID_HOST          = ISCSI_ERR_BASE + 18,
 264         ISCSI_ERR_XMIT_FAILED           = ISCSI_ERR_BASE + 19,
 265         ISCSI_ERR_TCP_CONN_CLOSE        = ISCSI_ERR_BASE + 20,
 266         ISCSI_ERR_SCSI_EH_SESSION_RST   = ISCSI_ERR_BASE + 21,
 267 };
 268
 269 /*
 270  * iSCSI Parameters (RFC3720)
 271  */
 272 enum iscsi_param {
 273         /* passed in using netlink set param */
 274         ISCSI_PARAM_MAX_RECV_DLENGTH,
 275         ISCSI_PARAM_MAX_XMIT_DLENGTH,
 276         ISCSI_PARAM_HDRDGST_EN,
 277         ISCSI_PARAM_DATADGST_EN,
 278         ISCSI_PARAM_INITIAL_R2T_EN,
 279         ISCSI_PARAM_MAX_R2T,
 280         ISCSI_PARAM_IMM_DATA_EN,
 281         ISCSI_PARAM_FIRST_BURST,
 282         ISCSI_PARAM_MAX_BURST,
 283         ISCSI_PARAM_PDU_INORDER_EN,
 284         ISCSI_PARAM_DATASEQ_INORDER_EN,
 285         ISCSI_PARAM_ERL,
 286         ISCSI_PARAM_IFMARKER_EN,
 287         ISCSI_PARAM_OFMARKER_EN,
 288         ISCSI_PARAM_EXP_STATSN,
 289         ISCSI_PARAM_TARGET_NAME,
 290         ISCSI_PARAM_TPGT,
 291         ISCSI_PARAM_PERSISTENT_ADDRESS,
 292         ISCSI_PARAM_PERSISTENT_PORT,
 293         ISCSI_PARAM_SESS_RECOVERY_TMO,
 294
 295         /* passed in through bind conn using transport_fd */
 296         ISCSI_PARAM_CONN_PORT,
 297         ISCSI_PARAM_CONN_ADDRESS,
 298
 299         ISCSI_PARAM_USERNAME,
 300         ISCSI_PARAM_USERNAME_IN,
 301         ISCSI_PARAM_PASSWORD,
 302         ISCSI_PARAM_PASSWORD_IN,
 303
 304         ISCSI_PARAM_FAST_ABORT,
 305         ISCSI_PARAM_ABORT_TMO,
 306         ISCSI_PARAM_LU_RESET_TMO,
 307         ISCSI_PARAM_HOST_RESET_TMO,
 308
 309         ISCSI_PARAM_PING_TMO,
 310         ISCSI_PARAM_RECV_TMO,
 311
 312         ISCSI_PARAM_IFACE_NAME,
 313         ISCSI_PARAM_ISID,
 314         ISCSI_PARAM_INITIATOR_NAME,
 315
 316         ISCSI_PARAM_TGT_RESET_TMO,
 317         ISCSI_PARAM_TARGET_ALIAS,
 318         /* must always be last */
 319         ISCSI_PARAM_MAX,
 320 };
 321
 322 #define ISCSI_MAX_RECV_DLENGTH          (1ULL << ISCSI_PARAM_MAX_RECV_DLENGTH)
 323 #define ISCSI_MAX_XMIT_DLENGTH          (1ULL << ISCSI_PARAM_MAX_XMIT_DLENGTH)
 324 #define ISCSI_HDRDGST_EN                (1ULL << ISCSI_PARAM_HDRDGST_EN)
 325 #define ISCSI_DATADGST_EN               (1ULL << ISCSI_PARAM_DATADGST_EN)
 326 #define ISCSI_INITIAL_R2T_EN            (1ULL << ISCSI_PARAM_INITIAL_R2T_EN)
 327 #define ISCSI_MAX_R2T                   (1ULL << ISCSI_PARAM_MAX_R2T)
 328 #define ISCSI_IMM_DATA_EN               (1ULL << ISCSI_PARAM_IMM_DATA_EN)
 329 #define ISCSI_FIRST_BURST               (1ULL << ISCSI_PARAM_FIRST_BURST)
 330 #define ISCSI_MAX_BURST                 (1ULL << ISCSI_PARAM_MAX_BURST)
 331 #define ISCSI_PDU_INORDER_EN            (1ULL << ISCSI_PARAM_PDU_INORDER_EN)
 332 #define ISCSI_DATASEQ_INORDER_EN        (1ULL << ISCSI_PARAM_DATASEQ_INORDER_EN)
 333 #define ISCSI_ERL                       (1ULL << ISCSI_PARAM_ERL)
 334 #define ISCSI_IFMARKER_EN               (1ULL << ISCSI_PARAM_IFMARKER_EN)
 335 #define ISCSI_OFMARKER_EN               (1ULL << ISCSI_PARAM_OFMARKER_EN)
 336 #define ISCSI_EXP_STATSN                (1ULL << ISCSI_PARAM_EXP_STATSN)
 337 #define ISCSI_TARGET_NAME               (1ULL << ISCSI_PARAM_TARGET_NAME)
 338 #define ISCSI_TPGT                      (1ULL << ISCSI_PARAM_TPGT)
 339 #define ISCSI_PERSISTENT_ADDRESS        (1ULL << ISCSI_PARAM_PERSISTENT_ADDRESS)
 340 #define ISCSI_PERSISTENT_PORT           (1ULL << ISCSI_PARAM_PERSISTENT_PORT)
 341 #define ISCSI_SESS_RECOVERY_TMO         (1ULL << ISCSI_PARAM_SESS_RECOVERY_TMO)
 342 #define ISCSI_CONN_PORT                 (1ULL << ISCSI_PARAM_CONN_PORT)
 343 #define ISCSI_CONN_ADDRESS              (1ULL << ISCSI_PARAM_CONN_ADDRESS)
 344 #define ISCSI_USERNAME                  (1ULL << ISCSI_PARAM_USERNAME)
 345 #define ISCSI_USERNAME_IN               (1ULL << ISCSI_PARAM_USERNAME_IN)
 346 #define ISCSI_PASSWORD                  (1ULL << ISCSI_PARAM_PASSWORD)
 347 #define ISCSI_PASSWORD_IN               (1ULL << ISCSI_PARAM_PASSWORD_IN)
 348 #define ISCSI_FAST_ABORT                (1ULL << ISCSI_PARAM_FAST_ABORT)
 349 #define ISCSI_ABORT_TMO                 (1ULL << ISCSI_PARAM_ABORT_TMO)
 350 #define ISCSI_LU_RESET_TMO              (1ULL << ISCSI_PARAM_LU_RESET_TMO)
 351 #define ISCSI_HOST_RESET_TMO            (1ULL << ISCSI_PARAM_HOST_RESET_TMO)
 352 #define ISCSI_PING_TMO                  (1ULL << ISCSI_PARAM_PING_TMO)
 353 #define ISCSI_RECV_TMO                  (1ULL << ISCSI_PARAM_RECV_TMO)
 354 #define ISCSI_IFACE_NAME                (1ULL << ISCSI_PARAM_IFACE_NAME)
 355 #define ISCSI_ISID                      (1ULL << ISCSI_PARAM_ISID)
 356 #define ISCSI_INITIATOR_NAME            (1ULL << ISCSI_PARAM_INITIATOR_NAME)
 357 #define ISCSI_TGT_RESET_TMO             (1ULL << ISCSI_PARAM_TGT_RESET_TMO)
 358 #define ISCSI_TARGET_ALIAS              (1ULL << ISCSI_PARAM_TARGET_ALIAS)
 359
 360 /* iSCSI HBA params */
 361 enum iscsi_host_param {
 362         ISCSI_HOST_PARAM_HWADDRESS,
 363         ISCSI_HOST_PARAM_INITIATOR_NAME,
 364         ISCSI_HOST_PARAM_NETDEV_NAME,
 365         ISCSI_HOST_PARAM_IPADDRESS,
 366         ISCSI_HOST_PARAM_MAX,
 367 };
 368
 369 #define ISCSI_HOST_HWADDRESS            (1ULL << ISCSI_HOST_PARAM_HWADDRESS)
 370 #define ISCSI_HOST_INITIATOR_NAME       (1ULL << ISCSI_HOST_PARAM_INITIATOR_NAME)
 371 #define ISCSI_HOST_NETDEV_NAME          (1ULL << ISCSI_HOST_PARAM_NETDEV_NAME)
 372 #define ISCSI_HOST_IPADDRESS            (1ULL << ISCSI_HOST_PARAM_IPADDRESS)
 373
 374 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 375 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
 376
 377 /*
 378  * These flags presents iSCSI Data-Path capabilities.
 379  */
 380 #define CAP_RECOVERY_L0         0x1
 381 #define CAP_RECOVERY_L1         0x2
 382 #define CAP_RECOVERY_L2         0x4
 383 #define CAP_MULTI_R2T           0x8
 384 #define CAP_HDRDGST             0x10
 385 #define CAP_DATADGST            0x20
 386 #define CAP_MULTI_CONN          0x40
 387 #define CAP_TEXT_NEGO           0x80
 388 #define CAP_MARKERS             0x100
 389 #define CAP_FW_DB               0x200
 390 #define CAP_SENDTARGETS_OFFLOAD 0x400   /* offload discovery process */
 391 #define CAP_DATA_PATH_OFFLOAD   0x800   /* offload entire IO path */
 392 #define CAP_DIGEST_OFFLOAD      0x1000  /* offload hdr and data digests */
 393 #define CAP_PADDING_OFFLOAD     0x2000  /* offload padding insertion, removal,
 394                                          and verification */
 395
 396 /*
 397  * These flags describes reason of stop_conn() call
 398  */
 399 #define STOP_CONN_TERM          0x1
 400 #define STOP_CONN_SUSPEND       0x2
 401 #define STOP_CONN_RECOVER       0x3
 402
 403 #define ISCSI_STATS_CUSTOM_MAX          32
 404 #define ISCSI_STATS_CUSTOM_DESC_MAX     64
 405 struct iscsi_stats_custom {
 406         char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
 407         uint64_t value;
 408 };
 409
 410 /*
 411  * struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
 412  *
 413  * Note: this structure contains counters collected on per-connection basis.
 414  */
 415 struct iscsi_stats {
 416         /* octets */
 417         uint64_t txdata_octets;
 418         uint64_t rxdata_octets;
 419
 420         /* xmit pdus */
 421         uint32_t noptx_pdus;
 422         uint32_t scsicmd_pdus;
 423         uint32_t tmfcmd_pdus;
 424         uint32_t login_pdus;
 425         uint32_t text_pdus;
 426         uint32_t dataout_pdus;
 427         uint32_t logout_pdus;
 428         uint32_t snack_pdus;
 429
 430         /* recv pdus */
 431         uint32_t noprx_pdus;
 432         uint32_t scsirsp_pdus;
 433         uint32_t tmfrsp_pdus;
 434         uint32_t textrsp_pdus;
 435         uint32_t datain_pdus;
 436         uint32_t logoutrsp_pdus;
 437         uint32_t r2t_pdus;
 438         uint32_t async_pdus;
 439         uint32_t rjt_pdus;
 440
 441         /* errors */
 442         uint32_t digest_err;
 443         uint32_t timeout_err;
 444
 445         /*
 446          * iSCSI Custom Statistics support, i.e. Transport could
 447          * extend existing MIB statistics with its own specific statistics
 448          * up to ISCSI_STATS_CUSTOM_MAX
 449          */
 450         uint32_t custom_length;
 451         struct iscsi_stats_custom custom[0]
 452                 __attribute__ ((aligned (sizeof(uint64_t))));
 453 };
 454
 455 #endif