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 session_table_alloc (void)
  26 {
  27   session_table_t *slt;
  28   pool_get_aligned (lookup_tables, slt, CLIB_CACHE_LINE_BYTES);
  29   memset (slt, 0, sizeof (*slt));
  30   return slt;
  31 }
  32
  33 u32
  34 session_table_index (session_table_t * slt)
  35 {
  36   return (slt - lookup_tables);
  37 }
  38
  39 session_table_t *
  40 session_table_get (u32 table_index)
  41 {
  42   if (vec_len (lookup_tables) <= table_index)
  43     return 0;
  44   return vec_elt_at_index (lookup_tables, table_index);
  45 }
  46
  47 #define foreach_hash_table_parameter            \
  48   _(v4,session,buckets,20000)                   \
  49   _(v4,session,memory,(64<<20))                 \
  50   _(v6,session,buckets,20000)                   \
  51   _(v6,session,memory,(64<<20))                 \
  52   _(v4,halfopen,buckets,20000)                  \
  53   _(v4,halfopen,memory,(64<<20))                \
  54   _(v6,halfopen,buckets,20000)                  \
  55   _(v6,halfopen,memory,(64<<20))
  56
  57 /**
  58  * Initialize session table hash tables
  59  *
  60  * If vpp configured with set of table parameters it uses them,
  61  * otherwise it uses defaults above.
  62  */
  63 void
  64 session_table_init (session_table_t * slt)
  65 {
  66 #define _(af,table,parm,value)                                          \
  67   u32 configured_##af##_##table##_table_##parm = value;
  68   foreach_hash_table_parameter;
  69 #undef _
  70
  71 #define _(af,table,parm,value)                                          \
  72   if (session_manager_main.configured_##af##_##table##_table_##parm)    \
  73     configured_##af##_##table##_table_##parm =                          \
  74       session_manager_main.configured_##af##_##table##_table_##parm;
  75   foreach_hash_table_parameter;
  76 #undef _
  77
  78   clib_bihash_init_16_8 (&slt->v4_session_hash, "v4 session table",
  79                          configured_v4_session_table_buckets,
  80                          configured_v4_session_table_memory);
  81   clib_bihash_init_48_8 (&slt->v6_session_hash, "v6 session table",
  82                          configured_v6_session_table_buckets,
  83                          configured_v6_session_table_memory);
  84   clib_bihash_init_16_8 (&slt->v4_half_open_hash, "v4 half-open table",
  85                          configured_v4_halfopen_table_buckets,
  86                          configured_v4_halfopen_table_memory);
  87   clib_bihash_init_48_8 (&slt->v6_half_open_hash, "v6 half-open table",
  88                          configured_v6_halfopen_table_buckets,
  89                          configured_v6_halfopen_table_memory);
  90 }
  91
  92 typedef struct _ip4_session_table_walk_ctx_t
  93 {
  94   ip4_session_table_walk_fn_t fn;
  95   void *ctx;
  96 } ip4_session_table_walk_ctx_t;
  97
  98 void
  99 ip4_session_table_walk_cb (clib_bihash_kv_16_8_t * kvp, void *arg)
 100 {
 101   ip4_session_table_walk_ctx_t *ctx = arg;
 102   ctx->fn (kvp, ctx->ctx);
 103 }
 104
 105 void
 106 ip4_session_table_walk (clib_bihash_16_8_t * hash,
 107                         ip4_session_table_walk_fn_t fn, void *arg)
 108 {
 109   ip4_session_table_walk_ctx_t ctx = {
 110     .fn = fn,
 111     .ctx = arg,
 112   };
 113   clib_bihash_foreach_key_value_pair_16_8 (hash, ip4_session_table_walk_cb,
 114                                            &ctx);
 115 }
 116
 117 /* *INDENT-ON* */
 118 /*
 119  * fd.io coding-style-patch-verification: ON
 120  *
 121  * Local Variables:
 122  * eval: (c-set-style "gnu")
 123  * End:
 124  */