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         /* up events */
  47         ISCSI_KEVENT_RECV_PDU           = KEVENT_BASE + 1,
  48         ISCSI_KEVENT_CONN_ERROR         = KEVENT_BASE + 2,
  49         ISCSI_KEVENT_IF_ERROR           = KEVENT_BASE + 3,
  50 };
  51
  52 struct iscsi_uevent {
  53         uint32_t type; /* k/u events type */
  54         uint32_t iferror; /* carries interface or resource errors */
  55         uint64_t transport_handle;
  56
  57         union {
  58                 /* messages u -> k */
  59                 struct msg_create_session {
  60                         uint32_t        initial_cmdsn;
  61                 } c_session;
  62                 struct msg_destroy_session {
  63                         uint64_t        session_handle;
  64                         uint32_t        sid;
  65                 } d_session;
  66                 struct msg_create_conn {
  67                         uint64_t        session_handle;
  68                         uint32_t        cid;
  69                         uint32_t        sid;
  70                 } c_conn;
  71                 struct msg_bind_conn {
  72                         uint64_t        session_handle;
  73                         uint64_t        conn_handle;
  74                         uint32_t        transport_fd;
  75                         uint32_t        is_leading;
  76                 } b_conn;
  77                 struct msg_destroy_conn {
  78                         uint64_t        conn_handle;
  79                         uint32_t        cid;
  80                 } d_conn;
  81                 struct msg_send_pdu {
  82                         uint32_t        hdr_size;
  83                         uint32_t        data_size;
  84                         uint64_t        conn_handle;
  85                 } send_pdu;
  86                 struct msg_set_param {
  87                         uint64_t        conn_handle;
  88                         uint32_t        param; /* enum iscsi_param */
  89                         uint32_t        value;
  90                 } set_param;
  91                 struct msg_start_conn {
  92                         uint64_t        conn_handle;
  93                 } start_conn;
  94                 struct msg_stop_conn {
  95                         uint64_t        conn_handle;
  96                         uint32_t        flag;
  97                 } stop_conn;
  98                 struct msg_get_stats {
  99                         uint64_t        conn_handle;
 100                 } get_stats;
 101         } u;
 102         union {
 103                 /* messages k -> u */
 104                 uint64_t                handle;
 105                 int                     retcode;
 106                 struct msg_create_session_ret {
 107                         uint64_t        session_handle;
 108                         uint32_t        sid;
 109                 } c_session_ret;
 110                 struct msg_recv_req {
 111                         uint64_t        recv_handle;
 112                         uint64_t        conn_handle;
 113                 } recv_req;
 114                 struct msg_conn_error {
 115                         uint64_t        conn_handle;
 116                         uint32_t        error; /* enum iscsi_err */
 117                 } connerror;
 118         } r;
 119 } __attribute__ ((aligned (sizeof(uint64_t))));
 120
 121 /*
 122  * Common error codes
 123  */
 124 enum iscsi_err {
 125         ISCSI_OK                        = 0,
 126
 127         ISCSI_ERR_DATASN                = ISCSI_ERR_BASE + 1,
 128         ISCSI_ERR_DATA_OFFSET           = ISCSI_ERR_BASE + 2,
 129         ISCSI_ERR_MAX_CMDSN             = ISCSI_ERR_BASE + 3,
 130         ISCSI_ERR_EXP_CMDSN             = ISCSI_ERR_BASE + 4,
 131         ISCSI_ERR_BAD_OPCODE            = ISCSI_ERR_BASE + 5,
 132         ISCSI_ERR_DATALEN               = ISCSI_ERR_BASE + 6,
 133         ISCSI_ERR_AHSLEN                = ISCSI_ERR_BASE + 7,
 134         ISCSI_ERR_PROTO                 = ISCSI_ERR_BASE + 8,
 135         ISCSI_ERR_LUN                   = ISCSI_ERR_BASE + 9,
 136         ISCSI_ERR_BAD_ITT               = ISCSI_ERR_BASE + 10,
 137         ISCSI_ERR_CONN_FAILED           = ISCSI_ERR_BASE + 11,
 138         ISCSI_ERR_R2TSN                 = ISCSI_ERR_BASE + 12,
 139         ISCSI_ERR_SESSION_FAILED        = ISCSI_ERR_BASE + 13,
 140         ISCSI_ERR_HDR_DGST              = ISCSI_ERR_BASE + 14,
 141         ISCSI_ERR_DATA_DGST             = ISCSI_ERR_BASE + 15,
 142         ISCSI_ERR_PARAM_NOT_FOUND       = ISCSI_ERR_BASE + 16
 143 };
 144
 145 /*
 146  * iSCSI Parameters (RFC3720)
 147  */
 148 enum iscsi_param {
 149         ISCSI_PARAM_MAX_RECV_DLENGTH    = 0,
 150         ISCSI_PARAM_MAX_XMIT_DLENGTH    = 1,
 151         ISCSI_PARAM_HDRDGST_EN          = 2,
 152         ISCSI_PARAM_DATADGST_EN         = 3,
 153         ISCSI_PARAM_INITIAL_R2T_EN      = 4,
 154         ISCSI_PARAM_MAX_R2T             = 5,
 155         ISCSI_PARAM_IMM_DATA_EN         = 6,
 156         ISCSI_PARAM_FIRST_BURST         = 7,
 157         ISCSI_PARAM_MAX_BURST           = 8,
 158         ISCSI_PARAM_PDU_INORDER_EN      = 9,
 159         ISCSI_PARAM_DATASEQ_INORDER_EN  = 10,
 160         ISCSI_PARAM_ERL                 = 11,
 161         ISCSI_PARAM_IFMARKER_EN         = 12,
 162         ISCSI_PARAM_OFMARKER_EN         = 13,
 163 };
 164 #define ISCSI_PARAM_MAX                 14
 165
 166 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 167 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
 168 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
 169
 170 /**
 171  * iscsi_hostdata - get LLD hostdata from scsi_host
 172  * @_hostdata: pointer to scsi host's hostdata
 173  **/
 174 #define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
 175
 176 /*
 177  * These flags presents iSCSI Data-Path capabilities.
 178  */
 179 #define CAP_RECOVERY_L0         0x1
 180 #define CAP_RECOVERY_L1         0x2
 181 #define CAP_RECOVERY_L2         0x4
 182 #define CAP_MULTI_R2T           0x8
 183 #define CAP_HDRDGST             0x10
 184 #define CAP_DATADGST            0x20
 185 #define CAP_MULTI_CONN          0x40
 186 #define CAP_TEXT_NEGO           0x80
 187 #define CAP_MARKERS             0x100
 188
 189 /*
 190  * These flags describes reason of stop_conn() call
 191  */
 192 #define STOP_CONN_TERM          0x1
 193 #define STOP_CONN_SUSPEND       0x2
 194 #define STOP_CONN_RECOVER       0x3
 195
 196 #define ISCSI_STATS_CUSTOM_MAX          32
 197 #define ISCSI_STATS_CUSTOM_DESC_MAX     64
 198 struct iscsi_stats_custom {
 199         char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
 200         uint64_t value;
 201 };
 202
 203 /*
 204  * struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
 205  *
 206  * Note: this structure contains counters collected on per-connection basis.
 207  */
 208 struct iscsi_stats {
 209         /* octets */
 210         uint64_t txdata_octets;
 211         uint64_t rxdata_octets;
 212
 213         /* xmit pdus */
 214         uint32_t noptx_pdus;
 215         uint32_t scsicmd_pdus;
 216         uint32_t tmfcmd_pdus;
 217         uint32_t login_pdus;
 218         uint32_t text_pdus;
 219         uint32_t dataout_pdus;
 220         uint32_t logout_pdus;
 221         uint32_t snack_pdus;
 222
 223         /* recv pdus */
 224         uint32_t noprx_pdus;
 225         uint32_t scsirsp_pdus;
 226         uint32_t tmfrsp_pdus;
 227         uint32_t textrsp_pdus;
 228         uint32_t datain_pdus;
 229         uint32_t logoutrsp_pdus;
 230         uint32_t r2t_pdus;
 231         uint32_t async_pdus;
 232         uint32_t rjt_pdus;
 233
 234         /* errors */
 235         uint32_t digest_err;
 236         uint32_t timeout_err;
 237
 238         /*
 239          * iSCSI Custom Statistics support, i.e. Transport could
 240          * extend existing MIB statistics with its own specific statistics
 241          * up to ISCSI_STATS_CUSTOM_MAX
 242          */
 243         uint32_t custom_length;
 244         struct iscsi_stats_custom custom[0]
 245                 __attribute__ ((aligned (sizeof(uint64_t))));
 246 };
 247
 248 #endif