include/scsi/srp.h

   1 /*
   2  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id$
  33  */
  34
  35 #ifndef SCSI_SRP_H
  36 #define SCSI_SRP_H
  37
  38 /*
  39  * Structures and constants for the SCSI RDMA Protocol (SRP) as
  40  * defined by the INCITS T10 committee.  This file was written using
  41  * draft Revision 16a of the SRP standard.
  42  */
  43
  44 #include <linux/types.h>
  45
  46 enum {
  47         SRP_LOGIN_REQ   = 0x00,
  48         SRP_TSK_MGMT    = 0x01,
  49         SRP_CMD         = 0x02,
  50         SRP_I_LOGOUT    = 0x03,
  51         SRP_LOGIN_RSP   = 0xc0,
  52         SRP_RSP         = 0xc1,
  53         SRP_LOGIN_REJ   = 0xc2,
  54         SRP_T_LOGOUT    = 0x80,
  55         SRP_CRED_REQ    = 0x81,
  56         SRP_AER_REQ     = 0x82,
  57         SRP_CRED_RSP    = 0x41,
  58         SRP_AER_RSP     = 0x42
  59 };
  60
  61 enum {
  62         SRP_BUF_FORMAT_DIRECT   = 1 << 1,
  63         SRP_BUF_FORMAT_INDIRECT = 1 << 2
  64 };
  65
  66 enum {
  67         SRP_NO_DATA_DESC        = 0,
  68         SRP_DATA_DESC_DIRECT    = 1,
  69         SRP_DATA_DESC_INDIRECT  = 2
  70 };
  71
  72 enum {
  73         SRP_TSK_ABORT_TASK      = 0x01,
  74         SRP_TSK_ABORT_TASK_SET  = 0x02,
  75         SRP_TSK_CLEAR_TASK_SET  = 0x04,
  76         SRP_TSK_LUN_RESET       = 0x08,
  77         SRP_TSK_CLEAR_ACA       = 0x40
  78 };
  79
  80 enum srp_login_rej_reason {
  81         SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL          = 0x00010000,
  82         SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES            = 0x00010001,
  83         SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE        = 0x00010002,
  84         SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL          = 0x00010003,
  85         SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT        = 0x00010004,
  86         SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED         = 0x00010005,
  87         SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED             = 0x00010006
  88 };
  89
  90 struct srp_direct_buf {
  91         __be64  va;
  92         __be32  key;
  93         __be32  len;
  94 };
  95
  96 /*
  97  * We need the packed attribute because the SRP spec puts the list of
  98  * descriptors at an offset of 20, which is not aligned to the size of
  99  * struct srp_direct_buf.  The whole structure must be packed to avoid
 100  * having the 20-byte structure padded to 24 bytes on 64-bit architectures.
 101  */
 102 struct srp_indirect_buf {
 103         struct srp_direct_buf   table_desc;
 104         __be32                  len;
 105         struct srp_direct_buf   desc_list[0];
 106 } __attribute__((packed));
 107
 108 enum {
 109         SRP_MULTICHAN_SINGLE = 0,
 110         SRP_MULTICHAN_MULTI  = 1
 111 };
 112
 113 struct srp_login_req {
 114         u8      opcode;
 115         u8      reserved1[7];
 116         u64     tag;
 117         __be32  req_it_iu_len;
 118         u8      reserved2[4];
 119         __be16  req_buf_fmt;
 120         u8      req_flags;
 121         u8      reserved3[5];
 122         u8      initiator_port_id[16];
 123         u8      target_port_id[16];
 124 };
 125
 126 /*
 127  * The SRP spec defines the size of the LOGIN_RSP structure to be 52
 128  * bytes, so it needs to be packed to avoid having it padded to 56
 129  * bytes on 64-bit architectures.
 130  */
 131 struct srp_login_rsp {
 132         u8      opcode;
 133         u8      reserved1[3];
 134         __be32  req_lim_delta;
 135         u64     tag;
 136         __be32  max_it_iu_len;
 137         __be32  max_ti_iu_len;
 138         __be16  buf_fmt;
 139         u8      rsp_flags;
 140         u8      reserved2[25];
 141 } __attribute__((packed));
 142
 143 struct srp_login_rej {
 144         u8      opcode;
 145         u8      reserved1[3];
 146         __be32  reason;
 147         u64     tag;
 148         u8      reserved2[8];
 149         __be16  buf_fmt;
 150         u8      reserved3[6];
 151 };
 152
 153 struct srp_i_logout {
 154         u8      opcode;
 155         u8      reserved[7];
 156         u64     tag;
 157 };
 158
 159 struct srp_t_logout {
 160         u8      opcode;
 161         u8      sol_not;
 162         u8      reserved[2];
 163         __be32  reason;
 164         u64     tag;
 165 };
 166
 167 /*
 168  * We need the packed attribute because the SRP spec only aligns the
 169  * 8-byte LUN field to 4 bytes.
 170  */
 171 struct srp_tsk_mgmt {
 172         u8      opcode;
 173         u8      sol_not;
 174         u8      reserved1[6];
 175         u64     tag;
 176         u8      reserved2[4];
 177         __be64  lun __attribute__((packed));
 178         u8      reserved3[2];
 179         u8      tsk_mgmt_func;
 180         u8      reserved4;
 181         u64     task_tag;
 182         u8      reserved5[8];
 183 };
 184
 185 /*
 186  * We need the packed attribute because the SRP spec only aligns the
 187  * 8-byte LUN field to 4 bytes.
 188  */
 189 struct srp_cmd {
 190         u8      opcode;
 191         u8      sol_not;
 192         u8      reserved1[3];
 193         u8      buf_fmt;
 194         u8      data_out_desc_cnt;
 195         u8      data_in_desc_cnt;
 196         u64     tag;
 197         u8      reserved2[4];
 198         __be64  lun __attribute__((packed));
 199         u8      reserved3;
 200         u8      task_attr;
 201         u8      reserved4;
 202         u8      add_cdb_len;
 203         u8      cdb[16];
 204         u8      add_data[0];
 205 };
 206
 207 enum {
 208         SRP_RSP_FLAG_RSPVALID = 1 << 0,
 209         SRP_RSP_FLAG_SNSVALID = 1 << 1,
 210         SRP_RSP_FLAG_DOOVER   = 1 << 2,
 211         SRP_RSP_FLAG_DOUNDER  = 1 << 3,
 212         SRP_RSP_FLAG_DIOVER   = 1 << 4,
 213         SRP_RSP_FLAG_DIUNDER  = 1 << 5
 214 };
 215
 216 /*
 217  * The SRP spec defines the size of the RSP structure to be 36 bytes,
 218  * so it needs to be packed to avoid having it padded to 40 bytes on
 219  * 64-bit architectures.
 220  */
 221 struct srp_rsp {
 222         u8      opcode;
 223         u8      sol_not;
 224         u8      reserved1[2];
 225         __be32  req_lim_delta;
 226         u64     tag;
 227         u8      reserved2[2];
 228         u8      flags;
 229         u8      status;
 230         __be32  data_out_res_cnt;
 231         __be32  data_in_res_cnt;
 232         __be32  sense_data_len;
 233         __be32  resp_data_len;
 234         u8      data[0];
 235 } __attribute__((packed));
 236
 237 #endif /* SCSI_SRP_H */