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
  26 #define UEVENT_BASE                     10
  27 #define KEVENT_BASE                     100
  28 #define ISCSI_ERR_BASE                  1000
  29
  30 enum iscsi_uevent_e {
  31         ISCSI_UEVENT_UNKNOWN            = 0,
  32
  33         /* down events */
  34         ISCSI_UEVENT_CREATE_SESSION     = UEVENT_BASE + 1,
  35         ISCSI_UEVENT_DESTROY_SESSION    = UEVENT_BASE + 2,
  36         ISCSI_UEVENT_CREATE_CONN        = UEVENT_BASE + 3,
  37         ISCSI_UEVENT_DESTROY_CONN       = UEVENT_BASE + 4,
  38         ISCSI_UEVENT_BIND_CONN          = UEVENT_BASE + 5,
  39         ISCSI_UEVENT_SET_PARAM          = UEVENT_BASE + 6,
  40         ISCSI_UEVENT_START_CONN         = UEVENT_BASE + 7,
  41         ISCSI_UEVENT_STOP_CONN          = UEVENT_BASE + 8,
  42         ISCSI_UEVENT_SEND_PDU           = UEVENT_BASE + 9,
  43         ISCSI_UEVENT_GET_STATS          = UEVENT_BASE + 10,
  44         ISCSI_UEVENT_GET_PARAM          = UEVENT_BASE + 11,
  45
  46         ISCSI_UEVENT_TRANSPORT_EP_CONNECT       = UEVENT_BASE + 12,
  47         ISCSI_UEVENT_TRANSPORT_EP_POLL          = UEVENT_BASE + 13,
  48         ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT    = UEVENT_BASE + 14,
  49
  50         ISCSI_UEVENT_TGT_DSCVR          = UEVENT_BASE + 15,
  51
  52         /* up events */
  53         ISCSI_KEVENT_RECV_PDU           = KEVENT_BASE + 1,
  54         ISCSI_KEVENT_CONN_ERROR         = KEVENT_BASE + 2,
  55         ISCSI_KEVENT_IF_ERROR           = KEVENT_BASE + 3,
  56         ISCSI_KEVENT_DESTROY_SESSION    = KEVENT_BASE + 4,
  57 };
  58
  59 enum iscsi_tgt_dscvr {
  60         ISCSI_TGT_DSCVR_SEND_TARGETS    = 1,
  61         ISCSI_TGT_DSCVR_ISNS            = 2,
  62         ISCSI_TGT_DSCVR_SLP             = 3,
  63 };
  64
  65 struct iscsi_uevent {
  66         uint32_t type; /* k/u events type */
  67         uint32_t iferror; /* carries interface or resource errors */
  68         uint64_t transport_handle;
  69
  70         union {
  71                 /* messages u -> k */
  72                 struct msg_create_session {
  73                         uint32_t        initial_cmdsn;
  74                 } c_session;
  75                 struct msg_destroy_session {
  76                         uint32_t        sid;
  77                 } d_session;
  78                 struct msg_create_conn {
  79                         uint32_t        sid;
  80                         uint32_t        cid;
  81                 } c_conn;
  82                 struct msg_bind_conn {
  83                         uint32_t        sid;
  84                         uint32_t        cid;
  85                         uint64_t        transport_eph;
  86                         uint32_t        is_leading;
  87                 } b_conn;
  88                 struct msg_destroy_conn {
  89                         uint32_t        sid;
  90                         uint32_t        cid;
  91                 } d_conn;
  92                 struct msg_send_pdu {
  93                         uint32_t        sid;
  94                         uint32_t        cid;
  95                         uint32_t        hdr_size;
  96                         uint32_t        data_size;
  97                 } send_pdu;
  98                 struct msg_set_param {
  99                         uint32_t        sid;
 100                         uint32_t        cid;
 101                         uint32_t        param; /* enum iscsi_param */
 102                         uint32_t        len;
 103                 } set_param;
 104                 struct msg_start_conn {
 105                         uint32_t        sid;
 106                         uint32_t        cid;
 107                 } start_conn;
 108                 struct msg_stop_conn {
 109                         uint32_t        sid;
 110                         uint32_t        cid;
 111                         uint64_t        conn_handle;
 112                         uint32_t        flag;
 113                 } stop_conn;
 114                 struct msg_get_stats {
 115                         uint32_t        sid;
 116                         uint32_t        cid;
 117                 } get_stats;
 118                 struct msg_transport_connect {
 119                         uint32_t        non_blocking;
 120                 } ep_connect;
 121                 struct msg_transport_poll {
 122                         uint64_t        ep_handle;
 123                         uint32_t        timeout_ms;
 124                 } ep_poll;
 125                 struct msg_transport_disconnect {
 126                         uint64_t        ep_handle;
 127                 } ep_disconnect;
 128                 struct msg_tgt_dscvr {
 129                         enum iscsi_tgt_dscvr    type;
 130                         uint32_t        host_no;
 131                         /*
 132                          * enable = 1 to establish a new connection
 133                          * with the server. enable = 0 to disconnect
 134                          * from the server. Used primarily to switch
 135                          * from one iSNS server to another.
 136                          */
 137                         uint32_t        enable;
 138                 } tgt_dscvr;
 139         } u;
 140         union {
 141                 /* messages k -> u */
 142                 int                     retcode;
 143                 struct msg_create_session_ret {
 144                         uint32_t        sid;
 145                         uint32_t        host_no;
 146                 } c_session_ret;
 147                 struct msg_create_conn_ret {
 148                         uint32_t        sid;
 149                         uint32_t        cid;
 150                 } c_conn_ret;
 151                 struct msg_recv_req {
 152                         uint32_t        sid;
 153                         uint32_t        cid;
 154                         uint64_t        recv_handle;
 155                 } recv_req;
 156                 struct msg_conn_error {
 157                         uint32_t        sid;
 158                         uint32_t        cid;
 159                         uint32_t        error; /* enum iscsi_err */
 160                 } connerror;
 161                 struct msg_session_destroyed {
 162                         uint32_t        host_no;
 163                         uint32_t        sid;
 164                 } d_session;
 165                 struct msg_transport_connect_ret {
 166                         uint64_t        handle;
 167                 } ep_connect_ret;
 168         } r;
 169 } __attribute__ ((aligned (sizeof(uint64_t))));
 170
 171 /*
 172  * Common error codes
 173  */
 174 enum iscsi_err {
 175         ISCSI_OK                        = 0,
 176
 177         ISCSI_ERR_DATASN                = ISCSI_ERR_BASE + 1,
 178         ISCSI_ERR_DATA_OFFSET           = ISCSI_ERR_BASE + 2,
 179         ISCSI_ERR_MAX_CMDSN             = ISCSI_ERR_BASE + 3,
 180         ISCSI_ERR_EXP_CMDSN             = ISCSI_ERR_BASE + 4,
 181         ISCSI_ERR_BAD_OPCODE            = ISCSI_ERR_BASE + 5,
 182         ISCSI_ERR_DATALEN               = ISCSI_ERR_BASE + 6,
 183         ISCSI_ERR_AHSLEN                = ISCSI_ERR_BASE + 7,
 184         ISCSI_ERR_PROTO                 = ISCSI_ERR_BASE + 8,
 185         ISCSI_ERR_LUN                   = ISCSI_ERR_BASE + 9,
 186         ISCSI_ERR_BAD_ITT               = ISCSI_ERR_BASE + 10,
 187         ISCSI_ERR_CONN_FAILED           = ISCSI_ERR_BASE + 11,
 188         ISCSI_ERR_R2TSN                 = ISCSI_ERR_BASE + 12,
 189         ISCSI_ERR_SESSION_FAILED        = ISCSI_ERR_BASE + 13,
 190         ISCSI_ERR_HDR_DGST              = ISCSI_ERR_BASE + 14,
 191         ISCSI_ERR_DATA_DGST             = ISCSI_ERR_BASE + 15,
 192         ISCSI_ERR_PARAM_NOT_FOUND       = ISCSI_ERR_BASE + 16,
 193         ISCSI_ERR_NO_SCSI_CMD           = ISCSI_ERR_BASE + 17,
 194 };
 195
 196 /*
 197  * iSCSI Parameters (RFC3720)
 198  */
 199 enum iscsi_param {
 200         /* passed in using netlink set param */
 201         ISCSI_PARAM_MAX_RECV_DLENGTH,
 202         ISCSI_PARAM_MAX_XMIT_DLENGTH,
 203         ISCSI_PARAM_HDRDGST_EN,
 204         ISCSI_PARAM_DATADGST_EN,
 205         ISCSI_PARAM_INITIAL_R2T_EN,
 206         ISCSI_PARAM_MAX_R2T,
 207         ISCSI_PARAM_IMM_DATA_EN,
 208         ISCSI_PARAM_FIRST_BURST,
 209         ISCSI_PARAM_MAX_BURST,
 210         ISCSI_PARAM_PDU_INORDER_EN,
 211         ISCSI_PARAM_DATASEQ_INORDER_EN,
 212         ISCSI_PARAM_ERL,
 213         ISCSI_PARAM_IFMARKER_EN,
 214         ISCSI_PARAM_OFMARKER_EN,
 215         ISCSI_PARAM_EXP_STATSN,
 216         ISCSI_PARAM_TARGET_NAME,
 217         ISCSI_PARAM_TPGT,
 218         ISCSI_PARAM_PERSISTENT_ADDRESS,
 219         ISCSI_PARAM_PERSISTENT_PORT,
 220         ISCSI_PARAM_SESS_RECOVERY_TMO,
 221
 222         /* pased in through bind conn using transport_fd */
 223         ISCSI_PARAM_CONN_PORT,
 224         ISCSI_PARAM_CONN_ADDRESS,
 225
 226         /* must always be last */
 227         ISCSI_PARAM_MAX,
 228 };
 229
 230 #define ISCSI_MAX_RECV_DLENGTH          (1 << ISCSI_PARAM_MAX_RECV_DLENGTH)
 231 #define ISCSI_MAX_XMIT_DLENGTH          (1 << ISCSI_PARAM_MAX_XMIT_DLENGTH)
 232 #define ISCSI_HDRDGST_EN                (1 << ISCSI_PARAM_HDRDGST_EN)
 233 #define ISCSI_DATADGST_EN               (1 << ISCSI_PARAM_DATADGST_EN)
 234 #define ISCSI_INITIAL_R2T_EN            (1 << ISCSI_PARAM_INITIAL_R2T_EN)
 235 #define ISCSI_MAX_R2T                   (1 << ISCSI_PARAM_MAX_R2T)
 236 #define ISCSI_IMM_DATA_EN               (1 << ISCSI_PARAM_IMM_DATA_EN)
 237 #define ISCSI_FIRST_BURST               (1 << ISCSI_PARAM_FIRST_BURST)
 238 #define ISCSI_MAX_BURST                 (1 << ISCSI_PARAM_MAX_BURST)
 239 #define ISCSI_PDU_INORDER_EN            (1 << ISCSI_PARAM_PDU_INORDER_EN)
 240 #define ISCSI_DATASEQ_INORDER_EN        (1 << ISCSI_PARAM_DATASEQ_INORDER_EN)
 241 #define ISCSI_ERL                       (1 << ISCSI_PARAM_ERL)
 242 #define ISCSI_IFMARKER_EN               (1 << ISCSI_PARAM_IFMARKER_EN)
 243 #define ISCSI_OFMARKER_EN               (1 << ISCSI_PARAM_OFMARKER_EN)
 244 #define ISCSI_EXP_STATSN                (1 << ISCSI_PARAM_EXP_STATSN)
 245 #define ISCSI_TARGET_NAME               (1 << ISCSI_PARAM_TARGET_NAME)
 246 #define ISCSI_TPGT                      (1 << ISCSI_PARAM_TPGT)
 247 #define ISCSI_PERSISTENT_ADDRESS        (1 << ISCSI_PARAM_PERSISTENT_ADDRESS)
 248 #define ISCSI_PERSISTENT_PORT           (1 << ISCSI_PARAM_PERSISTENT_PORT)
 249 #define ISCSI_SESS_RECOVERY_TMO         (1 << ISCSI_PARAM_SESS_RECOVERY_TMO)
 250 #define ISCSI_CONN_PORT                 (1 << ISCSI_PARAM_CONN_PORT)
 251 #define ISCSI_CONN_ADDRESS              (1 << ISCSI_PARAM_CONN_ADDRESS)
 252
 253 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 254 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
 255 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
 256
 257 /**
 258  * iscsi_hostdata - get LLD hostdata from scsi_host
 259  * @_hostdata: pointer to scsi host's hostdata
 260  **/
 261 #define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
 262
 263 /*
 264  * These flags presents iSCSI Data-Path capabilities.
 265  */
 266 #define CAP_RECOVERY_L0         0x1
 267 #define CAP_RECOVERY_L1         0x2
 268 #define CAP_RECOVERY_L2         0x4
 269 #define CAP_MULTI_R2T           0x8
 270 #define CAP_HDRDGST             0x10
 271 #define CAP_DATADGST            0x20
 272 #define CAP_MULTI_CONN          0x40
 273 #define CAP_TEXT_NEGO           0x80
 274 #define CAP_MARKERS             0x100
 275
 276 /*
 277  * These flags describes reason of stop_conn() call
 278  */
 279 #define STOP_CONN_TERM          0x1
 280 #define STOP_CONN_SUSPEND       0x2
 281 #define STOP_CONN_RECOVER       0x3
 282
 283 #define ISCSI_STATS_CUSTOM_MAX          32
 284 #define ISCSI_STATS_CUSTOM_DESC_MAX     64
 285 struct iscsi_stats_custom {
 286         char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
 287         uint64_t value;
 288 };
 289
 290 /*
 291  * struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
 292  *
 293  * Note: this structure contains counters collected on per-connection basis.
 294  */
 295 struct iscsi_stats {
 296         /* octets */
 297         uint64_t txdata_octets;
 298         uint64_t rxdata_octets;
 299
 300         /* xmit pdus */
 301         uint32_t noptx_pdus;
 302         uint32_t scsicmd_pdus;
 303         uint32_t tmfcmd_pdus;
 304         uint32_t login_pdus;
 305         uint32_t text_pdus;
 306         uint32_t dataout_pdus;
 307         uint32_t logout_pdus;
 308         uint32_t snack_pdus;
 309
 310         /* recv pdus */
 311         uint32_t noprx_pdus;
 312         uint32_t scsirsp_pdus;
 313         uint32_t tmfrsp_pdus;
 314         uint32_t textrsp_pdus;
 315         uint32_t datain_pdus;
 316         uint32_t logoutrsp_pdus;
 317         uint32_t r2t_pdus;
 318         uint32_t async_pdus;
 319         uint32_t rjt_pdus;
 320
 321         /* errors */
 322         uint32_t digest_err;
 323         uint32_t timeout_err;
 324
 325         /*
 326          * iSCSI Custom Statistics support, i.e. Transport could
 327          * extend existing MIB statistics with its own specific statistics
 328          * up to ISCSI_STATS_CUSTOM_MAX
 329          */
 330         uint32_t custom_length;
 331         struct iscsi_stats_custom custom[0]
 332                 __attribute__ ((aligned (sizeof(uint64_t))));
 333 };
 334
 335 #endif