src/vnet/session/session_table.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <vnet/session/session_table.h>
  17 #include <vnet/session/session.h>
  18
  19 /**
  20  * Pool of session tables
  21  */
  22 static session_table_t *lookup_tables;
  23
  24 session_table_t *
  25 _get_session_tables (void)
  26 {
  27   return lookup_tables;
  28 }
  29
  30 session_table_t *
  31 session_table_alloc (void)
  32 {
  33   session_table_t *slt;
  34   pool_get_aligned (lookup_tables, slt, CLIB_CACHE_LINE_BYTES);
  35   memset (slt, 0, sizeof (*slt));
  36   return slt;
  37 }
  38
  39 u32
  40 session_table_index (session_table_t * slt)
  41 {
  42   return (slt - lookup_tables);
  43 }
  44
  45 session_table_t *
  46 session_table_get (u32 table_index)
  47 {
  48   if (vec_len (lookup_tables) <= table_index)
  49     return 0;
  50   return vec_elt_at_index (lookup_tables, table_index);
  51 }
  52
  53 #define foreach_hash_table_parameter            \
  54   _(v4,session,buckets,20000)                   \
  55   _(v4,session,memory,(64<<20))                 \
  56   _(v6,session,buckets,20000)                   \
  57   _(v6,session,memory,(64<<20))                 \
  58   _(v4,halfopen,buckets,20000)                  \
  59   _(v4,halfopen,memory,(64<<20))                \
  60   _(v6,halfopen,buckets,20000)                  \
  61   _(v6,halfopen,memory,(64<<20))
  62
  63 /**
  64  * Initialize session table hash tables
  65  *
  66  * If vpp configured with set of table parameters it uses them,
  67  * otherwise it uses defaults above.
  68  */
  69 void
  70 session_table_init (session_table_t * slt, u8 fib_proto)
  71 {
  72   u8 all = fib_proto > FIB_PROTOCOL_IP6 ? 1 : 0;
  73
  74 #define _(af,table,parm,value)                                          \
  75   u32 configured_##af##_##table##_table_##parm = value;
  76   foreach_hash_table_parameter;
  77 #undef _
  78
  79 #define _(af,table,parm,value)                                          \
  80   if (session_manager_main.configured_##af##_##table##_table_##parm)    \
  81     configured_##af##_##table##_table_##parm =                          \
  82       session_manager_main.configured_##af##_##table##_table_##parm;
  83   foreach_hash_table_parameter;
  84 #undef _
  85
  86   if (fib_proto == FIB_PROTOCOL_IP4 || all)
  87     {
  88       clib_bihash_init_16_8 (&slt->v4_session_hash, "v4 session table",
  89                              configured_v4_session_table_buckets,
  90                              configured_v4_session_table_memory);
  91       clib_bihash_init_16_8 (&slt->v4_half_open_hash, "v4 half-open table",
  92                              configured_v4_halfopen_table_buckets,
  93                              configured_v4_halfopen_table_memory);
  94     }
  95   if (fib_proto == FIB_PROTOCOL_IP6 || all)
  96     {
  97       clib_bihash_init_48_8 (&slt->v6_session_hash, "v6 session table",
  98                              configured_v6_session_table_buckets,
  99                              configured_v6_session_table_memory);
 100       clib_bihash_init_48_8 (&slt->v6_half_open_hash, "v6 half-open table",
 101                              configured_v6_halfopen_table_buckets,
 102                              configured_v6_halfopen_table_memory);
 103     }
 104   session_rules_table_init (&slt->session_rules);
 105 }
 106
 107 typedef struct _ip4_session_table_walk_ctx_t
 108 {
 109   ip4_session_table_walk_fn_t fn;
 110   void *ctx;
 111 } ip4_session_table_walk_ctx_t;
 112
 113 void
 114 ip4_session_table_walk_cb (clib_bihash_kv_16_8_t * kvp, void *arg)
 115 {
 116   ip4_session_table_walk_ctx_t *ctx = arg;
 117   ctx->fn (kvp, ctx->ctx);
 118 }
 119
 120 void
 121 ip4_session_table_walk (clib_bihash_16_8_t * hash,
 122                         ip4_session_table_walk_fn_t fn, void *arg)
 123 {
 124   ip4_session_table_walk_ctx_t ctx = {
 125     .fn = fn,
 126     .ctx = arg,
 127   };
 128   clib_bihash_foreach_key_value_pair_16_8 (hash, ip4_session_table_walk_cb,
 129                                            &ctx);
 130 }
 131
 132 /* *INDENT-ON* */
 133 /*
 134  * fd.io coding-style-patch-verification: ON
 135  *
 136  * Local Variables:
 137  * eval: (c-set-style "gnu")
 138  * End:
 139  */