lib/nx-match.h

   1 /*
   2  * Copyright (c) 2010 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef NX_MATCH_H
  18 #define NX_MATCH_H 1
  19
  20 #include <stdint.h>
  21
  22 struct cls_rule;
  23 struct flow;
  24 struct ofpbuf;
  25 struct nx_action_reg_load;
  26 struct nx_action_reg_move;
  27
  28 /* Nicira Extended Match (NXM) flexible flow match helper functions.
  29  *
  30  * See include/openflow/nicira-ext.h for NXM specification.
  31  */
  32
  33 int nx_pull_match(struct ofpbuf *, unsigned int match_len, uint16_t priority,
  34                   struct cls_rule *);
  35 int nx_put_match(struct ofpbuf *, const struct cls_rule *);
  36
  37 char *nx_match_to_string(const uint8_t *, unsigned int match_len);
  38 int nx_match_from_string(const char *, struct ofpbuf *);
  39
  40 int nxm_check_reg_move(const struct nx_action_reg_move *, const struct flow *);
  41 int nxm_check_reg_load(const struct nx_action_reg_load *, const struct flow *);
  42
  43 void nxm_execute_reg_move(const struct nx_action_reg_move *, struct flow *);
  44 void nxm_execute_reg_load(const struct nx_action_reg_load *, struct flow *);
  45
  46 /* Upper bound on the length of an nx_match.  The longest nx_match (assuming
  47  * we implement 4 registers) would be:
  48  *
  49  *                   header  value  mask  total
  50  *                   ------  -----  ----  -----
  51  *  NXM_OF_IN_PORT      4       2    --      6
  52  *  NXM_OF_ETH_DST_W    4       6     6     16
  53  *  NXM_OF_ETH_SRC      4       6    --     10
  54  *  NXM_OF_ETH_TYPE     4       2    --      6
  55  *  NXM_OF_VLAN_TCI     4       2     2      8
  56  *  NXM_OF_IP_TOS       4       1    --      5
  57  *  NXM_OF_IP_PROTO     4       2    --      6
  58  *  NXM_OF_IP_SRC_W     4       4     4     12
  59  *  NXM_OF_IP_DST_W     4       4     4     12
  60  *  NXM_OF_TCP_SRC      4       2    --      6
  61  *  NXM_OF_TCP_DST      4       2    --      6
  62  *  NXM_NX_REG_W(0)     4       4     4     12
  63  *  NXM_NX_REG_W(1)     4       4     4     12
  64  *  NXM_NX_REG_W(2)     4       4     4     12
  65  *  NXM_NX_REG_W(3)     4       4     4     12
  66  *  NXM_NX_TUN_ID_W     4       8     8     20
  67  *  -------------------------------------------
  68  *  total                                  161
  69  *
  70  * So this value is conservative.
  71  */
  72 #define NXM_MAX_LEN 192
  73
  74 /* This is my guess at the length of a "typical" nx_match, for use in
  75  * predicting space requirements. */
  76 #define NXM_TYPICAL_LEN 64
  77
  78 #endif /* nx-match.h */