kernel/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 #include <uapi/linux/if_ether.h>
  38
  39 enum {
  40         IB_LRH_BYTES  = 8,
  41         IB_ETH_BYTES  = 14,
  42         IB_VLAN_BYTES = 4,
  43         IB_GRH_BYTES  = 40,
  44         IB_BTH_BYTES  = 12,
  45         IB_DETH_BYTES = 8
  46 };
  47
  48 struct ib_field {
  49         size_t struct_offset_bytes;
  50         size_t struct_size_bytes;
  51         int    offset_words;
  52         int    offset_bits;
  53         int    size_bits;
  54         char  *field_name;
  55 };
  56
  57 #define RESERVED \
  58         .field_name          = "reserved"
  59
  60 /*
  61  * This macro cleans up the definitions of constants for BTH opcodes.
  62  * It is used to define constants such as IB_OPCODE_UD_SEND_ONLY,
  63  * which becomes IB_OPCODE_UD + IB_OPCODE_SEND_ONLY, and this gives
  64  * the correct value.
  65  *
  66  * In short, user code should use the constants defined using the
  67  * macro rather than worrying about adding together other constants.
  68 */
  69 #define IB_OPCODE(transport, op) \
  70         IB_OPCODE_ ## transport ## _ ## op = \
  71                 IB_OPCODE_ ## transport + IB_OPCODE_ ## op
  72
  73 enum {
  74         /* transport types -- just used to define real constants */
  75         IB_OPCODE_RC                                = 0x00,
  76         IB_OPCODE_UC                                = 0x20,
  77         IB_OPCODE_RD                                = 0x40,
  78         IB_OPCODE_UD                                = 0x60,
  79         /* per IBTA 1.3 vol 1 Table 38, A10.3.2 */
  80         IB_OPCODE_CNP                               = 0x80,
  81
  82         /* operations -- just used to define real constants */
  83         IB_OPCODE_SEND_FIRST                        = 0x00,
  84         IB_OPCODE_SEND_MIDDLE                       = 0x01,
  85         IB_OPCODE_SEND_LAST                         = 0x02,
  86         IB_OPCODE_SEND_LAST_WITH_IMMEDIATE          = 0x03,
  87         IB_OPCODE_SEND_ONLY                         = 0x04,
  88         IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE          = 0x05,
  89         IB_OPCODE_RDMA_WRITE_FIRST                  = 0x06,
  90         IB_OPCODE_RDMA_WRITE_MIDDLE                 = 0x07,
  91         IB_OPCODE_RDMA_WRITE_LAST                   = 0x08,
  92         IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE    = 0x09,
  93         IB_OPCODE_RDMA_WRITE_ONLY                   = 0x0a,
  94         IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE    = 0x0b,
  95         IB_OPCODE_RDMA_READ_REQUEST                 = 0x0c,
  96         IB_OPCODE_RDMA_READ_RESPONSE_FIRST          = 0x0d,
  97         IB_OPCODE_RDMA_READ_RESPONSE_MIDDLE         = 0x0e,
  98         IB_OPCODE_RDMA_READ_RESPONSE_LAST           = 0x0f,
  99         IB_OPCODE_RDMA_READ_RESPONSE_ONLY           = 0x10,
 100         IB_OPCODE_ACKNOWLEDGE                       = 0x11,
 101         IB_OPCODE_ATOMIC_ACKNOWLEDGE                = 0x12,
 102         IB_OPCODE_COMPARE_SWAP                      = 0x13,
 103         IB_OPCODE_FETCH_ADD                         = 0x14,
 104
 105         /* real constants follow -- see comment about above IB_OPCODE()
 106            macro for more details */
 107
 108         /* RC */
 109         IB_OPCODE(RC, SEND_FIRST),
 110         IB_OPCODE(RC, SEND_MIDDLE),
 111         IB_OPCODE(RC, SEND_LAST),
 112         IB_OPCODE(RC, SEND_LAST_WITH_IMMEDIATE),
 113         IB_OPCODE(RC, SEND_ONLY),
 114         IB_OPCODE(RC, SEND_ONLY_WITH_IMMEDIATE),
 115         IB_OPCODE(RC, RDMA_WRITE_FIRST),
 116         IB_OPCODE(RC, RDMA_WRITE_MIDDLE),
 117         IB_OPCODE(RC, RDMA_WRITE_LAST),
 118         IB_OPCODE(RC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 119         IB_OPCODE(RC, RDMA_WRITE_ONLY),
 120         IB_OPCODE(RC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 121         IB_OPCODE(RC, RDMA_READ_REQUEST),
 122         IB_OPCODE(RC, RDMA_READ_RESPONSE_FIRST),
 123         IB_OPCODE(RC, RDMA_READ_RESPONSE_MIDDLE),
 124         IB_OPCODE(RC, RDMA_READ_RESPONSE_LAST),
 125         IB_OPCODE(RC, RDMA_READ_RESPONSE_ONLY),
 126         IB_OPCODE(RC, ACKNOWLEDGE),
 127         IB_OPCODE(RC, ATOMIC_ACKNOWLEDGE),
 128         IB_OPCODE(RC, COMPARE_SWAP),
 129         IB_OPCODE(RC, FETCH_ADD),
 130
 131         /* UC */
 132         IB_OPCODE(UC, SEND_FIRST),
 133         IB_OPCODE(UC, SEND_MIDDLE),
 134         IB_OPCODE(UC, SEND_LAST),
 135         IB_OPCODE(UC, SEND_LAST_WITH_IMMEDIATE),
 136         IB_OPCODE(UC, SEND_ONLY),
 137         IB_OPCODE(UC, SEND_ONLY_WITH_IMMEDIATE),
 138         IB_OPCODE(UC, RDMA_WRITE_FIRST),
 139         IB_OPCODE(UC, RDMA_WRITE_MIDDLE),
 140         IB_OPCODE(UC, RDMA_WRITE_LAST),
 141         IB_OPCODE(UC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 142         IB_OPCODE(UC, RDMA_WRITE_ONLY),
 143         IB_OPCODE(UC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 144
 145         /* RD */
 146         IB_OPCODE(RD, SEND_FIRST),
 147         IB_OPCODE(RD, SEND_MIDDLE),
 148         IB_OPCODE(RD, SEND_LAST),
 149         IB_OPCODE(RD, SEND_LAST_WITH_IMMEDIATE),
 150         IB_OPCODE(RD, SEND_ONLY),
 151         IB_OPCODE(RD, SEND_ONLY_WITH_IMMEDIATE),
 152         IB_OPCODE(RD, RDMA_WRITE_FIRST),
 153         IB_OPCODE(RD, RDMA_WRITE_MIDDLE),
 154         IB_OPCODE(RD, RDMA_WRITE_LAST),
 155         IB_OPCODE(RD, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 156         IB_OPCODE(RD, RDMA_WRITE_ONLY),
 157         IB_OPCODE(RD, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 158         IB_OPCODE(RD, RDMA_READ_REQUEST),
 159         IB_OPCODE(RD, RDMA_READ_RESPONSE_FIRST),
 160         IB_OPCODE(RD, RDMA_READ_RESPONSE_MIDDLE),
 161         IB_OPCODE(RD, RDMA_READ_RESPONSE_LAST),
 162         IB_OPCODE(RD, RDMA_READ_RESPONSE_ONLY),
 163         IB_OPCODE(RD, ACKNOWLEDGE),
 164         IB_OPCODE(RD, ATOMIC_ACKNOWLEDGE),
 165         IB_OPCODE(RD, COMPARE_SWAP),
 166         IB_OPCODE(RD, FETCH_ADD),
 167
 168         /* UD */
 169         IB_OPCODE(UD, SEND_ONLY),
 170         IB_OPCODE(UD, SEND_ONLY_WITH_IMMEDIATE)
 171 };
 172
 173 enum {
 174         IB_LNH_RAW        = 0,
 175         IB_LNH_IP         = 1,
 176         IB_LNH_IBA_LOCAL  = 2,
 177         IB_LNH_IBA_GLOBAL = 3
 178 };
 179
 180 struct ib_unpacked_lrh {
 181         u8        virtual_lane;
 182         u8        link_version;
 183         u8        service_level;
 184         u8        link_next_header;
 185         __be16    destination_lid;
 186         __be16    packet_length;
 187         __be16    source_lid;
 188 };
 189
 190 struct ib_unpacked_grh {
 191         u8           ip_version;
 192         u8           traffic_class;
 193         __be32       flow_label;
 194         __be16       payload_length;
 195         u8           next_header;
 196         u8           hop_limit;
 197         union ib_gid source_gid;
 198         union ib_gid destination_gid;
 199 };
 200
 201 struct ib_unpacked_bth {
 202         u8           opcode;
 203         u8           solicited_event;
 204         u8           mig_req;
 205         u8           pad_count;
 206         u8           transport_header_version;
 207         __be16       pkey;
 208         __be32       destination_qpn;
 209         u8           ack_req;
 210         __be32       psn;
 211 };
 212
 213 struct ib_unpacked_deth {
 214         __be32       qkey;
 215         __be32       source_qpn;
 216 };
 217
 218 struct ib_unpacked_eth {
 219         u8      dmac_h[4];
 220         u8      dmac_l[2];
 221         u8      smac_h[2];
 222         u8      smac_l[4];
 223         __be16  type;
 224 };
 225
 226 struct ib_unpacked_vlan {
 227         __be16  tag;
 228         __be16  type;
 229 };
 230
 231 struct ib_ud_header {
 232         int                     lrh_present;
 233         struct ib_unpacked_lrh  lrh;
 234         int                     eth_present;
 235         struct ib_unpacked_eth  eth;
 236         int                     vlan_present;
 237         struct ib_unpacked_vlan vlan;
 238         int                     grh_present;
 239         struct ib_unpacked_grh  grh;
 240         struct ib_unpacked_bth  bth;
 241         struct ib_unpacked_deth deth;
 242         int                     immediate_present;
 243         __be32                  immediate_data;
 244 };
 245
 246 void ib_pack(const struct ib_field        *desc,
 247              int                           desc_len,
 248              void                         *structure,
 249              void                         *buf);
 250
 251 void ib_unpack(const struct ib_field        *desc,
 252                int                           desc_len,
 253                void                         *buf,
 254                void                         *structure);
 255
 256 void ib_ud_header_init(int                  payload_bytes,
 257                        int                  lrh_present,
 258                        int                  eth_present,
 259                        int                  vlan_present,
 260                        int                  grh_present,
 261                        int                  immediate_present,
 262                        struct ib_ud_header *header);
 263
 264 int ib_ud_header_pack(struct ib_ud_header *header,
 265                       void                *buf);
 266
 267 int ib_ud_header_unpack(void                *buf,
 268                         struct ib_ud_header *header);
 269
 270 #endif /* IB_PACK_H */