include/rdma/ib_pack.h

   1 /*
   2  * Copyright (c) 2004 Topspin Corporation.  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
  33 #ifndef IB_PACK_H
  34 #define IB_PACK_H
  35
  36 #include <rdma/ib_verbs.h>
  37
  38 enum {
  39         IB_LRH_BYTES  = 8,
  40         IB_GRH_BYTES  = 40,
  41         IB_BTH_BYTES  = 12,
  42         IB_DETH_BYTES = 8
  43 };
  44
  45 struct ib_field {
  46         size_t struct_offset_bytes;
  47         size_t struct_size_bytes;
  48         int    offset_words;
  49         int    offset_bits;
  50         int    size_bits;
  51         char  *field_name;
  52 };
  53
  54 #define RESERVED \
  55         .field_name          = "reserved"
  56
  57 /*
  58  * This macro cleans up the definitions of constants for BTH opcodes.
  59  * It is used to define constants such as IB_OPCODE_UD_SEND_ONLY,
  60  * which becomes IB_OPCODE_UD + IB_OPCODE_SEND_ONLY, and this gives
  61  * the correct value.
  62  *
  63  * In short, user code should use the constants defined using the
  64  * macro rather than worrying about adding together other constants.
  65 */
  66 #define IB_OPCODE(transport, op) \
  67         IB_OPCODE_ ## transport ## _ ## op = \
  68                 IB_OPCODE_ ## transport + IB_OPCODE_ ## op
  69
  70 enum {
  71         /* transport types -- just used to define real constants */
  72         IB_OPCODE_RC                                = 0x00,
  73         IB_OPCODE_UC                                = 0x20,
  74         IB_OPCODE_RD                                = 0x40,
  75         IB_OPCODE_UD                                = 0x60,
  76
  77         /* operations -- just used to define real constants */
  78         IB_OPCODE_SEND_FIRST                        = 0x00,
  79         IB_OPCODE_SEND_MIDDLE                       = 0x01,
  80         IB_OPCODE_SEND_LAST                         = 0x02,
  81         IB_OPCODE_SEND_LAST_WITH_IMMEDIATE          = 0x03,
  82         IB_OPCODE_SEND_ONLY                         = 0x04,
  83         IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE          = 0x05,
  84         IB_OPCODE_RDMA_WRITE_FIRST                  = 0x06,
  85         IB_OPCODE_RDMA_WRITE_MIDDLE                 = 0x07,
  86         IB_OPCODE_RDMA_WRITE_LAST                   = 0x08,
  87         IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE    = 0x09,
  88         IB_OPCODE_RDMA_WRITE_ONLY                   = 0x0a,
  89         IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE    = 0x0b,
  90         IB_OPCODE_RDMA_READ_REQUEST                 = 0x0c,
  91         IB_OPCODE_RDMA_READ_RESPONSE_FIRST          = 0x0d,
  92         IB_OPCODE_RDMA_READ_RESPONSE_MIDDLE         = 0x0e,
  93         IB_OPCODE_RDMA_READ_RESPONSE_LAST           = 0x0f,
  94         IB_OPCODE_RDMA_READ_RESPONSE_ONLY           = 0x10,
  95         IB_OPCODE_ACKNOWLEDGE                       = 0x11,
  96         IB_OPCODE_ATOMIC_ACKNOWLEDGE                = 0x12,
  97         IB_OPCODE_COMPARE_SWAP                      = 0x13,
  98         IB_OPCODE_FETCH_ADD                         = 0x14,
  99
 100         /* real constants follow -- see comment about above IB_OPCODE()
 101            macro for more details */
 102
 103         /* RC */
 104         IB_OPCODE(RC, SEND_FIRST),
 105         IB_OPCODE(RC, SEND_MIDDLE),
 106         IB_OPCODE(RC, SEND_LAST),
 107         IB_OPCODE(RC, SEND_LAST_WITH_IMMEDIATE),
 108         IB_OPCODE(RC, SEND_ONLY),
 109         IB_OPCODE(RC, SEND_ONLY_WITH_IMMEDIATE),
 110         IB_OPCODE(RC, RDMA_WRITE_FIRST),
 111         IB_OPCODE(RC, RDMA_WRITE_MIDDLE),
 112         IB_OPCODE(RC, RDMA_WRITE_LAST),
 113         IB_OPCODE(RC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 114         IB_OPCODE(RC, RDMA_WRITE_ONLY),
 115         IB_OPCODE(RC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 116         IB_OPCODE(RC, RDMA_READ_REQUEST),
 117         IB_OPCODE(RC, RDMA_READ_RESPONSE_FIRST),
 118         IB_OPCODE(RC, RDMA_READ_RESPONSE_MIDDLE),
 119         IB_OPCODE(RC, RDMA_READ_RESPONSE_LAST),
 120         IB_OPCODE(RC, RDMA_READ_RESPONSE_ONLY),
 121         IB_OPCODE(RC, ACKNOWLEDGE),
 122         IB_OPCODE(RC, ATOMIC_ACKNOWLEDGE),
 123         IB_OPCODE(RC, COMPARE_SWAP),
 124         IB_OPCODE(RC, FETCH_ADD),
 125
 126         /* UC */
 127         IB_OPCODE(UC, SEND_FIRST),
 128         IB_OPCODE(UC, SEND_MIDDLE),
 129         IB_OPCODE(UC, SEND_LAST),
 130         IB_OPCODE(UC, SEND_LAST_WITH_IMMEDIATE),
 131         IB_OPCODE(UC, SEND_ONLY),
 132         IB_OPCODE(UC, SEND_ONLY_WITH_IMMEDIATE),
 133         IB_OPCODE(UC, RDMA_WRITE_FIRST),
 134         IB_OPCODE(UC, RDMA_WRITE_MIDDLE),
 135         IB_OPCODE(UC, RDMA_WRITE_LAST),
 136         IB_OPCODE(UC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 137         IB_OPCODE(UC, RDMA_WRITE_ONLY),
 138         IB_OPCODE(UC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 139
 140         /* RD */
 141         IB_OPCODE(RD, SEND_FIRST),
 142         IB_OPCODE(RD, SEND_MIDDLE),
 143         IB_OPCODE(RD, SEND_LAST),
 144         IB_OPCODE(RD, SEND_LAST_WITH_IMMEDIATE),
 145         IB_OPCODE(RD, SEND_ONLY),
 146         IB_OPCODE(RD, SEND_ONLY_WITH_IMMEDIATE),
 147         IB_OPCODE(RD, RDMA_WRITE_FIRST),
 148         IB_OPCODE(RD, RDMA_WRITE_MIDDLE),
 149         IB_OPCODE(RD, RDMA_WRITE_LAST),
 150         IB_OPCODE(RD, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 151         IB_OPCODE(RD, RDMA_WRITE_ONLY),
 152         IB_OPCODE(RD, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 153         IB_OPCODE(RD, RDMA_READ_REQUEST),
 154         IB_OPCODE(RD, RDMA_READ_RESPONSE_FIRST),
 155         IB_OPCODE(RD, RDMA_READ_RESPONSE_MIDDLE),
 156         IB_OPCODE(RD, RDMA_READ_RESPONSE_LAST),
 157         IB_OPCODE(RD, RDMA_READ_RESPONSE_ONLY),
 158         IB_OPCODE(RD, ACKNOWLEDGE),
 159         IB_OPCODE(RD, ATOMIC_ACKNOWLEDGE),
 160         IB_OPCODE(RD, COMPARE_SWAP),
 161         IB_OPCODE(RD, FETCH_ADD),
 162
 163         /* UD */
 164         IB_OPCODE(UD, SEND_ONLY),
 165         IB_OPCODE(UD, SEND_ONLY_WITH_IMMEDIATE)
 166 };
 167
 168 enum {
 169         IB_LNH_RAW        = 0,
 170         IB_LNH_IP         = 1,
 171         IB_LNH_IBA_LOCAL  = 2,
 172         IB_LNH_IBA_GLOBAL = 3
 173 };
 174
 175 struct ib_unpacked_lrh {
 176         u8        virtual_lane;
 177         u8        link_version;
 178         u8        service_level;
 179         u8        link_next_header;
 180         __be16    destination_lid;
 181         __be16    packet_length;
 182         __be16    source_lid;
 183 };
 184
 185 struct ib_unpacked_grh {
 186         u8           ip_version;
 187         u8           traffic_class;
 188         __be32       flow_label;
 189         __be16       payload_length;
 190         u8           next_header;
 191         u8           hop_limit;
 192         union ib_gid source_gid;
 193         union ib_gid destination_gid;
 194 };
 195
 196 struct ib_unpacked_bth {
 197         u8           opcode;
 198         u8           solicited_event;
 199         u8           mig_req;
 200         u8           pad_count;
 201         u8           transport_header_version;
 202         __be16       pkey;
 203         __be32       destination_qpn;
 204         u8           ack_req;
 205         __be32       psn;
 206 };
 207
 208 struct ib_unpacked_deth {
 209         __be32       qkey;
 210         __be32       source_qpn;
 211 };
 212
 213 struct ib_ud_header {
 214         struct ib_unpacked_lrh  lrh;
 215         int                     grh_present;
 216         struct ib_unpacked_grh  grh;
 217         struct ib_unpacked_bth  bth;
 218         struct ib_unpacked_deth deth;
 219         int                     immediate_present;
 220         __be32                  immediate_data;
 221 };
 222
 223 void ib_pack(const struct ib_field        *desc,
 224              int                           desc_len,
 225              void                         *structure,
 226              void                         *buf);
 227
 228 void ib_unpack(const struct ib_field        *desc,
 229                int                           desc_len,
 230                void                         *buf,
 231                void                         *structure);
 232
 233 void ib_ud_header_init(int                 payload_bytes,
 234                        int                 grh_present,
 235                        struct ib_ud_header *header);
 236
 237 int ib_ud_header_pack(struct ib_ud_header *header,
 238                       void                *buf);
 239
 240 int ib_ud_header_unpack(void                *buf,
 241                         struct ib_ud_header *header);
 242
 243 #endif /* IB_PACK_H */