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 #include <scsi/scsi.h>
  46
  47 enum {
  48         SRP_LOGIN_REQ   = 0x00,
  49         SRP_TSK_MGMT    = 0x01,
  50         SRP_CMD         = 0x02,
  51         SRP_I_LOGOUT    = 0x03,
  52         SRP_LOGIN_RSP   = 0xc0,
  53         SRP_RSP         = 0xc1,
  54         SRP_LOGIN_REJ   = 0xc2,
  55         SRP_T_LOGOUT    = 0x80,
  56         SRP_CRED_REQ    = 0x81,
  57         SRP_AER_REQ     = 0x82,
  58         SRP_CRED_RSP    = 0x41,
  59         SRP_AER_RSP     = 0x42
  60 };
  61
  62 enum {
  63         SRP_BUF_FORMAT_DIRECT   = 1 << 1,
  64         SRP_BUF_FORMAT_INDIRECT = 1 << 2
  65 };
  66
  67 enum {
  68         SRP_NO_DATA_DESC        = 0,
  69         SRP_DATA_DESC_DIRECT    = 1,
  70         SRP_DATA_DESC_INDIRECT  = 2
  71 };
  72
  73 enum {
  74         SRP_TSK_ABORT_TASK      = 0x01,
  75         SRP_TSK_ABORT_TASK_SET  = 0x02,
  76         SRP_TSK_CLEAR_TASK_SET  = 0x04,
  77         SRP_TSK_LUN_RESET       = 0x08,
  78         SRP_TSK_CLEAR_ACA       = 0x40
  79 };
  80
  81 enum srp_login_rej_reason {
  82         SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL          = 0x00010000,
  83         SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES            = 0x00010001,
  84         SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE        = 0x00010002,
  85         SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL          = 0x00010003,
  86         SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT        = 0x00010004,
  87         SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED         = 0x00010005,
  88         SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED             = 0x00010006
  89 };
  90
  91 enum {
  92         SRP_REV10_IB_IO_CLASS   = 0xff00,
  93         SRP_REV16A_IB_IO_CLASS  = 0x0100
  94 };
  95
  96 struct srp_direct_buf {
  97         __be64  va;
  98         __be32  key;
  99         __be32  len;
 100 };
 101
 102 /*
 103  * We need the packed attribute because the SRP spec puts the list of
 104  * descriptors at an offset of 20, which is not aligned to the size of
 105  * struct srp_direct_buf.  The whole structure must be packed to avoid
 106  * having the 20-byte structure padded to 24 bytes on 64-bit architectures.
 107  */
 108 struct srp_indirect_buf {
 109         struct srp_direct_buf   table_desc;
 110         __be32                  len;
 111         struct srp_direct_buf   desc_list[0];
 112 } __attribute__((packed));
 113
 114 enum {
 115         SRP_MULTICHAN_SINGLE = 0,
 116         SRP_MULTICHAN_MULTI  = 1
 117 };
 118
 119 struct srp_login_req {
 120         u8      opcode;
 121         u8      reserved1[7];
 122         u64     tag;
 123         __be32  req_it_iu_len;
 124         u8      reserved2[4];
 125         __be16  req_buf_fmt;
 126         u8      req_flags;
 127         u8      reserved3[5];
 128         u8      initiator_port_id[16];
 129         u8      target_port_id[16];
 130 };
 131
 132 /*
 133  * The SRP spec defines the size of the LOGIN_RSP structure to be 52
 134  * bytes, so it needs to be packed to avoid having it padded to 56
 135  * bytes on 64-bit architectures.
 136  */
 137 struct srp_login_rsp {
 138         u8      opcode;
 139         u8      reserved1[3];
 140         __be32  req_lim_delta;
 141         u64     tag;
 142         __be32  max_it_iu_len;
 143         __be32  max_ti_iu_len;
 144         __be16  buf_fmt;
 145         u8      rsp_flags;
 146         u8      reserved2[25];
 147 } __attribute__((packed));
 148
 149 struct srp_login_rej {
 150         u8      opcode;
 151         u8      reserved1[3];
 152         __be32  reason;
 153         u64     tag;
 154         u8      reserved2[8];
 155         __be16  buf_fmt;
 156         u8      reserved3[6];
 157 };
 158
 159 struct srp_i_logout {
 160         u8      opcode;
 161         u8      reserved[7];
 162         u64     tag;
 163 };
 164
 165 struct srp_t_logout {
 166         u8      opcode;
 167         u8      sol_not;
 168         u8      reserved[2];
 169         __be32  reason;
 170         u64     tag;
 171 };
 172
 173 /*
 174  * We need the packed attribute because the SRP spec only aligns the
 175  * 8-byte LUN field to 4 bytes.
 176  */
 177 struct srp_tsk_mgmt {
 178         u8      opcode;
 179         u8      sol_not;
 180         u8      reserved1[6];
 181         u64     tag;
 182         u8      reserved2[4];
 183         struct scsi_lun lun;
 184         u8      reserved3[2];
 185         u8      tsk_mgmt_func;
 186         u8      reserved4;
 187         u64     task_tag;
 188         u8      reserved5[8];
 189 };
 190
 191 /*
 192  * We need the packed attribute because the SRP spec only aligns the
 193  * 8-byte LUN field to 4 bytes.
 194  */
 195 struct srp_cmd {
 196         u8      opcode;
 197         u8      sol_not;
 198         u8      reserved1[3];
 199         u8      buf_fmt;
 200         u8      data_out_desc_cnt;
 201         u8      data_in_desc_cnt;
 202         u64     tag;
 203         u8      reserved2[4];
 204         struct scsi_lun lun;
 205         u8      reserved3;
 206         u8      task_attr;
 207         u8      reserved4;
 208         u8      add_cdb_len;
 209         u8      cdb[16];
 210         u8      add_data[0];
 211 };
 212
 213 enum {
 214         SRP_RSP_FLAG_RSPVALID = 1 << 0,
 215         SRP_RSP_FLAG_SNSVALID = 1 << 1,
 216         SRP_RSP_FLAG_DOOVER   = 1 << 2,
 217         SRP_RSP_FLAG_DOUNDER  = 1 << 3,
 218         SRP_RSP_FLAG_DIOVER   = 1 << 4,
 219         SRP_RSP_FLAG_DIUNDER  = 1 << 5
 220 };
 221
 222 /*
 223  * The SRP spec defines the size of the RSP structure to be 36 bytes,
 224  * so it needs to be packed to avoid having it padded to 40 bytes on
 225  * 64-bit architectures.
 226  */
 227 struct srp_rsp {
 228         u8      opcode;
 229         u8      sol_not;
 230         u8      reserved1[2];
 231         __be32  req_lim_delta;
 232         u64     tag;
 233         u8      reserved2[2];
 234         u8      flags;
 235         u8      status;
 236         __be32  data_out_res_cnt;
 237         __be32  data_in_res_cnt;
 238         __be32  sense_data_len;
 239         __be32  resp_data_len;
 240         u8      data[0];
 241 } __attribute__((packed));
 242
 243 struct srp_cred_req {
 244         u8      opcode;
 245         u8      sol_not;
 246         u8      reserved[2];
 247         __be32  req_lim_delta;
 248         u64     tag;
 249 };
 250
 251 struct srp_cred_rsp {
 252         u8      opcode;
 253         u8      reserved[7];
 254         u64     tag;
 255 };
 256
 257 /*
 258  * The SRP spec defines the fixed portion of the AER_REQ structure to be
 259  * 36 bytes, so it needs to be packed to avoid having it padded to 40 bytes
 260  * on 64-bit architectures.
 261  */
 262 struct srp_aer_req {
 263         u8      opcode;
 264         u8      sol_not;
 265         u8      reserved[2];
 266         __be32  req_lim_delta;
 267         u64     tag;
 268         u32     reserved2;
 269         struct scsi_lun lun;
 270         __be32  sense_data_len;
 271         u32     reserved3;
 272         u8      sense_data[0];
 273 } __attribute__((packed));
 274
 275 struct srp_aer_rsp {
 276         u8      opcode;
 277         u8      reserved[7];
 278         u64     tag;
 279 };
 280
 281 #endif /* SCSI_SRP_H */