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_IP4_BYTES            = 20,
  45         IB_UDP_BYTES            = 8,
  46         IB_BTH_BYTES            = 12,
  47         IB_DETH_BYTES           = 8,
  48         IB_EXT_ATOMICETH_BYTES  = 28,
  49         IB_EXT_XRC_BYTES        = 4,
  50         IB_ICRC_BYTES           = 4
  51 };
  52
  53 struct ib_field {
  54         size_t struct_offset_bytes;
  55         size_t struct_size_bytes;
  56         int    offset_words;
  57         int    offset_bits;
  58         int    size_bits;
  59         char  *field_name;
  60 };
  61
  62 #define RESERVED \
  63         .field_name          = "reserved"
  64
  65 /*
  66  * This macro cleans up the definitions of constants for BTH opcodes.
  67  * It is used to define constants such as IB_OPCODE_UD_SEND_ONLY,
  68  * which becomes IB_OPCODE_UD + IB_OPCODE_SEND_ONLY, and this gives
  69  * the correct value.
  70  *
  71  * In short, user code should use the constants defined using the
  72  * macro rather than worrying about adding together other constants.
  73 */
  74 #define IB_OPCODE(transport, op) \
  75         IB_OPCODE_ ## transport ## _ ## op = \
  76                 IB_OPCODE_ ## transport + IB_OPCODE_ ## op
  77
  78 enum {
  79         /* transport types -- just used to define real constants */
  80         IB_OPCODE_RC                                = 0x00,
  81         IB_OPCODE_UC                                = 0x20,
  82         IB_OPCODE_RD                                = 0x40,
  83         IB_OPCODE_UD                                = 0x60,
  84         /* per IBTA 1.3 vol 1 Table 38, A10.3.2 */
  85         IB_OPCODE_CNP                               = 0x80,
  86
  87         /* operations -- just used to define real constants */
  88         IB_OPCODE_SEND_FIRST                        = 0x00,
  89         IB_OPCODE_SEND_MIDDLE                       = 0x01,
  90         IB_OPCODE_SEND_LAST                         = 0x02,
  91         IB_OPCODE_SEND_LAST_WITH_IMMEDIATE          = 0x03,
  92         IB_OPCODE_SEND_ONLY                         = 0x04,
  93         IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE          = 0x05,
  94         IB_OPCODE_RDMA_WRITE_FIRST                  = 0x06,
  95         IB_OPCODE_RDMA_WRITE_MIDDLE                 = 0x07,
  96         IB_OPCODE_RDMA_WRITE_LAST                   = 0x08,
  97         IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE    = 0x09,
  98         IB_OPCODE_RDMA_WRITE_ONLY                   = 0x0a,
  99         IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE    = 0x0b,
 100         IB_OPCODE_RDMA_READ_REQUEST                 = 0x0c,
 101         IB_OPCODE_RDMA_READ_RESPONSE_FIRST          = 0x0d,
 102         IB_OPCODE_RDMA_READ_RESPONSE_MIDDLE         = 0x0e,
 103         IB_OPCODE_RDMA_READ_RESPONSE_LAST           = 0x0f,
 104         IB_OPCODE_RDMA_READ_RESPONSE_ONLY           = 0x10,
 105         IB_OPCODE_ACKNOWLEDGE                       = 0x11,
 106         IB_OPCODE_ATOMIC_ACKNOWLEDGE                = 0x12,
 107         IB_OPCODE_COMPARE_SWAP                      = 0x13,
 108         IB_OPCODE_FETCH_ADD                         = 0x14,
 109         /* opcode 0x15 is reserved */
 110         IB_OPCODE_SEND_LAST_WITH_INVALIDATE         = 0x16,
 111         IB_OPCODE_SEND_ONLY_WITH_INVALIDATE         = 0x17,
 112
 113         /* real constants follow -- see comment about above IB_OPCODE()
 114            macro for more details */
 115
 116         /* RC */
 117         IB_OPCODE(RC, SEND_FIRST),
 118         IB_OPCODE(RC, SEND_MIDDLE),
 119         IB_OPCODE(RC, SEND_LAST),
 120         IB_OPCODE(RC, SEND_LAST_WITH_IMMEDIATE),
 121         IB_OPCODE(RC, SEND_ONLY),
 122         IB_OPCODE(RC, SEND_ONLY_WITH_IMMEDIATE),
 123         IB_OPCODE(RC, RDMA_WRITE_FIRST),
 124         IB_OPCODE(RC, RDMA_WRITE_MIDDLE),
 125         IB_OPCODE(RC, RDMA_WRITE_LAST),
 126         IB_OPCODE(RC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 127         IB_OPCODE(RC, RDMA_WRITE_ONLY),
 128         IB_OPCODE(RC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 129         IB_OPCODE(RC, RDMA_READ_REQUEST),
 130         IB_OPCODE(RC, RDMA_READ_RESPONSE_FIRST),
 131         IB_OPCODE(RC, RDMA_READ_RESPONSE_MIDDLE),
 132         IB_OPCODE(RC, RDMA_READ_RESPONSE_LAST),
 133         IB_OPCODE(RC, RDMA_READ_RESPONSE_ONLY),
 134         IB_OPCODE(RC, ACKNOWLEDGE),
 135         IB_OPCODE(RC, ATOMIC_ACKNOWLEDGE),
 136         IB_OPCODE(RC, COMPARE_SWAP),
 137         IB_OPCODE(RC, FETCH_ADD),
 138         IB_OPCODE(RC, SEND_LAST_WITH_INVALIDATE),
 139         IB_OPCODE(RC, SEND_ONLY_WITH_INVALIDATE),
 140
 141         /* UC */
 142         IB_OPCODE(UC, SEND_FIRST),
 143         IB_OPCODE(UC, SEND_MIDDLE),
 144         IB_OPCODE(UC, SEND_LAST),
 145         IB_OPCODE(UC, SEND_LAST_WITH_IMMEDIATE),
 146         IB_OPCODE(UC, SEND_ONLY),
 147         IB_OPCODE(UC, SEND_ONLY_WITH_IMMEDIATE),
 148         IB_OPCODE(UC, RDMA_WRITE_FIRST),
 149         IB_OPCODE(UC, RDMA_WRITE_MIDDLE),
 150         IB_OPCODE(UC, RDMA_WRITE_LAST),
 151         IB_OPCODE(UC, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 152         IB_OPCODE(UC, RDMA_WRITE_ONLY),
 153         IB_OPCODE(UC, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 154
 155         /* RD */
 156         IB_OPCODE(RD, SEND_FIRST),
 157         IB_OPCODE(RD, SEND_MIDDLE),
 158         IB_OPCODE(RD, SEND_LAST),
 159         IB_OPCODE(RD, SEND_LAST_WITH_IMMEDIATE),
 160         IB_OPCODE(RD, SEND_ONLY),
 161         IB_OPCODE(RD, SEND_ONLY_WITH_IMMEDIATE),
 162         IB_OPCODE(RD, RDMA_WRITE_FIRST),
 163         IB_OPCODE(RD, RDMA_WRITE_MIDDLE),
 164         IB_OPCODE(RD, RDMA_WRITE_LAST),
 165         IB_OPCODE(RD, RDMA_WRITE_LAST_WITH_IMMEDIATE),
 166         IB_OPCODE(RD, RDMA_WRITE_ONLY),
 167         IB_OPCODE(RD, RDMA_WRITE_ONLY_WITH_IMMEDIATE),
 168         IB_OPCODE(RD, RDMA_READ_REQUEST),
 169         IB_OPCODE(RD, RDMA_READ_RESPONSE_FIRST),
 170         IB_OPCODE(RD, RDMA_READ_RESPONSE_MIDDLE),
 171         IB_OPCODE(RD, RDMA_READ_RESPONSE_LAST),
 172         IB_OPCODE(RD, RDMA_READ_RESPONSE_ONLY),
 173         IB_OPCODE(RD, ACKNOWLEDGE),
 174         IB_OPCODE(RD, ATOMIC_ACKNOWLEDGE),
 175         IB_OPCODE(RD, COMPARE_SWAP),
 176         IB_OPCODE(RD, FETCH_ADD),
 177
 178         /* UD */
 179         IB_OPCODE(UD, SEND_ONLY),
 180         IB_OPCODE(UD, SEND_ONLY_WITH_IMMEDIATE)
 181 };
 182
 183 enum {
 184         IB_LNH_RAW        = 0,
 185         IB_LNH_IP         = 1,
 186         IB_LNH_IBA_LOCAL  = 2,
 187         IB_LNH_IBA_GLOBAL = 3
 188 };
 189
 190 struct ib_unpacked_lrh {
 191         u8        virtual_lane;
 192         u8        link_version;
 193         u8        service_level;
 194         u8        link_next_header;
 195         __be16    destination_lid;
 196         __be16    packet_length;
 197         __be16    source_lid;
 198 };
 199
 200 struct ib_unpacked_grh {
 201         u8           ip_version;
 202         u8           traffic_class;
 203         __be32       flow_label;
 204         __be16       payload_length;
 205         u8           next_header;
 206         u8           hop_limit;
 207         union ib_gid source_gid;
 208         union ib_gid destination_gid;
 209 };
 210
 211 struct ib_unpacked_bth {
 212         u8           opcode;
 213         u8           solicited_event;
 214         u8           mig_req;
 215         u8           pad_count;
 216         u8           transport_header_version;
 217         __be16       pkey;
 218         __be32       destination_qpn;
 219         u8           ack_req;
 220         __be32       psn;
 221 };
 222
 223 struct ib_unpacked_deth {
 224         __be32       qkey;
 225         __be32       source_qpn;
 226 };
 227
 228 struct ib_unpacked_eth {
 229         u8      dmac_h[4];
 230         u8      dmac_l[2];
 231         u8      smac_h[2];
 232         u8      smac_l[4];
 233         __be16  type;
 234 };
 235
 236 struct ib_unpacked_ip4 {
 237         u8      ver;
 238         u8      hdr_len;
 239         u8      tos;
 240         __be16  tot_len;
 241         __be16  id;
 242         __be16  frag_off;
 243         u8      ttl;
 244         u8      protocol;
 245         __sum16 check;
 246         __be32  saddr;
 247         __be32  daddr;
 248 };
 249
 250 struct ib_unpacked_udp {
 251         __be16  sport;
 252         __be16  dport;
 253         __be16  length;
 254         __be16  csum;
 255 };
 256
 257 struct ib_unpacked_vlan {
 258         __be16  tag;
 259         __be16  type;
 260 };
 261
 262 struct ib_ud_header {
 263         int                     lrh_present;
 264         struct ib_unpacked_lrh  lrh;
 265         int                     eth_present;
 266         struct ib_unpacked_eth  eth;
 267         int                     vlan_present;
 268         struct ib_unpacked_vlan vlan;
 269         int                     grh_present;
 270         struct ib_unpacked_grh  grh;
 271         int                     ipv4_present;
 272         struct ib_unpacked_ip4  ip4;
 273         int                     udp_present;
 274         struct ib_unpacked_udp  udp;
 275         struct ib_unpacked_bth  bth;
 276         struct ib_unpacked_deth deth;
 277         int                     immediate_present;
 278         __be32                  immediate_data;
 279 };
 280
 281 void ib_pack(const struct ib_field        *desc,
 282              int                           desc_len,
 283              void                         *structure,
 284              void                         *buf);
 285
 286 void ib_unpack(const struct ib_field        *desc,
 287                int                           desc_len,
 288                void                         *buf,
 289                void                         *structure);
 290
 291 __sum16 ib_ud_ip4_csum(struct ib_ud_header *header);
 292
 293 int ib_ud_header_init(int                   payload_bytes,
 294                       int                   lrh_present,
 295                       int                   eth_present,
 296                       int                   vlan_present,
 297                       int                   grh_present,
 298                       int                   ip_version,
 299                       int                   udp_present,
 300                       int                   immediate_present,
 301                       struct ib_ud_header *header);
 302
 303 int ib_ud_header_pack(struct ib_ud_header *header,
 304                       void                *buf);
 305
 306 int ib_ud_header_unpack(void                *buf,
 307                         struct ib_ud_header *header);
 308
 309 #endif /* IB_PACK_H */