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 enum {
  91         SRP_REV10_IB_IO_CLASS   = 0xff00,
  92         SRP_REV16A_IB_IO_CLASS  = 0x0100
  93 };
  94
  95 struct srp_direct_buf {
  96         __be64  va;
  97         __be32  key;
  98         __be32  len;
  99 };
 100
 101 /*
 102  * We need the packed attribute because the SRP spec puts the list of
 103  * descriptors at an offset of 20, which is not aligned to the size of
 104  * struct srp_direct_buf.  The whole structure must be packed to avoid
 105  * having the 20-byte structure padded to 24 bytes on 64-bit architectures.
 106  */
 107 struct srp_indirect_buf {
 108         struct srp_direct_buf   table_desc;
 109         __be32                  len;
 110         struct srp_direct_buf   desc_list[0];
 111 } __attribute__((packed));
 112
 113 enum {
 114         SRP_MULTICHAN_SINGLE = 0,
 115         SRP_MULTICHAN_MULTI  = 1
 116 };
 117
 118 struct srp_login_req {
 119         u8      opcode;
 120         u8      reserved1[7];
 121         u64     tag;
 122         __be32  req_it_iu_len;
 123         u8      reserved2[4];
 124         __be16  req_buf_fmt;
 125         u8      req_flags;
 126         u8      reserved3[5];
 127         u8      initiator_port_id[16];
 128         u8      target_port_id[16];
 129 };
 130
 131 /*
 132  * The SRP spec defines the size of the LOGIN_RSP structure to be 52
 133  * bytes, so it needs to be packed to avoid having it padded to 56
 134  * bytes on 64-bit architectures.
 135  */
 136 struct srp_login_rsp {
 137         u8      opcode;
 138         u8      reserved1[3];
 139         __be32  req_lim_delta;
 140         u64     tag;
 141         __be32  max_it_iu_len;
 142         __be32  max_ti_iu_len;
 143         __be16  buf_fmt;
 144         u8      rsp_flags;
 145         u8      reserved2[25];
 146 } __attribute__((packed));
 147
 148 struct srp_login_rej {
 149         u8      opcode;
 150         u8      reserved1[3];
 151         __be32  reason;
 152         u64     tag;
 153         u8      reserved2[8];
 154         __be16  buf_fmt;
 155         u8      reserved3[6];
 156 };
 157
 158 struct srp_i_logout {
 159         u8      opcode;
 160         u8      reserved[7];
 161         u64     tag;
 162 };
 163
 164 struct srp_t_logout {
 165         u8      opcode;
 166         u8      sol_not;
 167         u8      reserved[2];
 168         __be32  reason;
 169         u64     tag;
 170 };
 171
 172 /*
 173  * We need the packed attribute because the SRP spec only aligns the
 174  * 8-byte LUN field to 4 bytes.
 175  */
 176 struct srp_tsk_mgmt {
 177         u8      opcode;
 178         u8      sol_not;
 179         u8      reserved1[6];
 180         u64     tag;
 181         u8      reserved2[4];
 182         __be64  lun __attribute__((packed));
 183         u8      reserved3[2];
 184         u8      tsk_mgmt_func;
 185         u8      reserved4;
 186         u64     task_tag;
 187         u8      reserved5[8];
 188 };
 189
 190 /*
 191  * We need the packed attribute because the SRP spec only aligns the
 192  * 8-byte LUN field to 4 bytes.
 193  */
 194 struct srp_cmd {
 195         u8      opcode;
 196         u8      sol_not;
 197         u8      reserved1[3];
 198         u8      buf_fmt;
 199         u8      data_out_desc_cnt;
 200         u8      data_in_desc_cnt;
 201         u64     tag;
 202         u8      reserved2[4];
 203         __be64  lun __attribute__((packed));
 204         u8      reserved3;
 205         u8      task_attr;
 206         u8      reserved4;
 207         u8      add_cdb_len;
 208         u8      cdb[16];
 209         u8      add_data[0];
 210 };
 211
 212 enum {
 213         SRP_RSP_FLAG_RSPVALID = 1 << 0,
 214         SRP_RSP_FLAG_SNSVALID = 1 << 1,
 215         SRP_RSP_FLAG_DOOVER   = 1 << 2,
 216         SRP_RSP_FLAG_DOUNDER  = 1 << 3,
 217         SRP_RSP_FLAG_DIOVER   = 1 << 4,
 218         SRP_RSP_FLAG_DIUNDER  = 1 << 5
 219 };
 220
 221 /*
 222  * The SRP spec defines the size of the RSP structure to be 36 bytes,
 223  * so it needs to be packed to avoid having it padded to 40 bytes on
 224  * 64-bit architectures.
 225  */
 226 struct srp_rsp {
 227         u8      opcode;
 228         u8      sol_not;
 229         u8      reserved1[2];
 230         __be32  req_lim_delta;
 231         u64     tag;
 232         u8      reserved2[2];
 233         u8      flags;
 234         u8      status;
 235         __be32  data_out_res_cnt;
 236         __be32  data_in_res_cnt;
 237         __be32  sense_data_len;
 238         __be32  resp_data_len;
 239         u8      data[0];
 240 } __attribute__((packed));
 241
 242 #endif /* SCSI_SRP_H */