linux/include/scsi/srp.h
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   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
  46enum {
  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
  61enum {
  62        SRP_BUF_FORMAT_DIRECT   = 1 << 1,
  63        SRP_BUF_FORMAT_INDIRECT = 1 << 2
  64};
  65
  66enum {
  67        SRP_NO_DATA_DESC        = 0,
  68        SRP_DATA_DESC_DIRECT    = 1,
  69        SRP_DATA_DESC_INDIRECT  = 2
  70};
  71
  72enum {
  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
  80enum 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
  90enum {
  91        SRP_REV10_IB_IO_CLASS   = 0xff00,
  92        SRP_REV16A_IB_IO_CLASS  = 0x0100
  93};
  94
  95struct 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 */
 107struct 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
 113enum {
 114        SRP_MULTICHAN_SINGLE = 0,
 115        SRP_MULTICHAN_MULTI  = 1
 116};
 117
 118struct 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 */
 136struct 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
 148struct 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
 158struct srp_i_logout {
 159        u8      opcode;
 160        u8      reserved[7];
 161        u64     tag;
 162};
 163
 164struct 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 */
 176struct 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 */
 194struct 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
 212enum {
 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 */
 226struct 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
 242struct srp_cred_req {
 243        u8      opcode;
 244        u8      sol_not;
 245        u8      reserved[2];
 246        __be32  req_lim_delta;
 247        u64     tag;
 248};
 249
 250struct srp_cred_rsp {
 251        u8      opcode;
 252        u8      reserved[7];
 253        u64     tag;
 254};
 255
 256/*
 257 * The SRP spec defines the fixed portion of the AER_REQ structure to be
 258 * 36 bytes, so it needs to be packed to avoid having it padded to 40 bytes
 259 * on 64-bit architectures.
 260 */
 261struct srp_aer_req {
 262        u8      opcode;
 263        u8      sol_not;
 264        u8      reserved[2];
 265        __be32  req_lim_delta;
 266        u64     tag;
 267        u32     reserved2;
 268        __be64  lun;
 269        __be32  sense_data_len;
 270        u32     reserved3;
 271        u8      sense_data[0];
 272} __attribute__((packed));
 273
 274struct srp_aer_rsp {
 275        u8      opcode;
 276        u8      reserved[7];
 277        u64     tag;
 278};
 279
 280#endif /* SCSI_SRP_H */
 281
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