nat: delay datastructure allocation until configured

The dslite plugin would on plugin load initialize large bihash datastructures.
Postpone until configured.

Type: improvement
Change-Id: Ie790ab8c5fc39fac18153acd54dcd051805e763a
Signed-off-by: Ole Troan <ot@cisco.com>

2 files changed, 33 insertions, 18 deletions

diff --git a/src/plugins/nat/dslite/dslite.c b/src/plugins/nat/dslite/dslite.c
index 4ca24a4bfff..4fe4422df13 100644
--- a/src/plugins/nat/dslite/dslite.c
+++ b/src/plugins/nat/dslite/dslite.c
@@ -34,11 +34,6 @@ dslite_init (vlib_main_t * vm)
   vlib_thread_main_t *tm = vlib_get_thread_main ();
   uword *p;
   vlib_node_t *node;
-  dslite_per_thread_data_t *td;
-  u32 translation_buckets = 1024;
-  u32 translation_memory_size = 128 << 20;
-  u32 b4_buckets = 128;
-  u32 b4_memory_size = 64 << 20;
 
   node = vlib_get_node_by_name (vm, (u8 *) "dslite-in2out");
   dm->dslite_in2out_node_index = node->index;
@@ -74,20 +69,8 @@ dslite_init (vlib_main_t * vm)
 
   vec_validate (dm->per_thread_data, tm->n_vlib_mains - 1);
 
-  /* *INDENT-OFF* */
-  vec_foreach (td, dm->per_thread_data)
-    {
-      clib_bihash_init_24_8 (&td->in2out, "in2out", translation_buckets,
-                             translation_memory_size);
-
-      clib_bihash_init_8_8 (&td->out2in, "out2in", translation_buckets,
-                            translation_memory_size);
-
-      clib_bihash_init_16_8 (&td->b4_hash, "b4s", b4_buckets, b4_memory_size);
-    }
-  /* *INDENT-ON* */
-
   dm->is_ce = 0;
+  dm->is_enabled = 0;
 
   /* Init counters */
   dm->total_b4s.name = "total-b4s";
@@ -108,6 +91,31 @@ dslite_init (vlib_main_t * vm)
   return dslite_api_hookup (vm);
 }
 
+static void
+dslite_init_datastructures (void)
+{
+  dslite_main_t *dm = &dslite_main;
+  dslite_per_thread_data_t *td;
+  u32 translation_buckets = 1024;
+  u32 translation_memory_size = 128 << 20;
+  u32 b4_buckets = 128;
+  u32 b4_memory_size = 64 << 20;
+
+  /* *INDENT-OFF* */
+  vec_foreach (td, dm->per_thread_data)
+    {
+      clib_bihash_init_24_8 (&td->in2out, "dslite in2out", translation_buckets,
+                             translation_memory_size);
+
+      clib_bihash_init_8_8 (&td->out2in, "dslite out2in", translation_buckets,
+                            translation_memory_size);
+
+      clib_bihash_init_16_8 (&td->b4_hash, "dslite b4s", b4_buckets, b4_memory_size);
+    }
+  /* *INDENT-ON* */
+  dm->is_enabled = 1;
+}
+
 void
 dslite_set_ce (dslite_main_t * dm, u8 set)
 {
@@ -134,6 +142,9 @@ dslite_set_aftr_ip6_addr (dslite_main_t * dm, ip6_address_t * addr)
 {
   dpo_id_t dpo = DPO_INVALID;
 
+  if (!dm->is_enabled)
+    dslite_init_datastructures ();
+
   if (dm->is_ce)
     {
       dslite_ce_dpo_create (DPO_PROTO_IP4, 0, &dpo);
@@ -175,6 +186,9 @@ dslite_set_aftr_ip4_addr (dslite_main_t * dm, ip4_address_t * addr)
 int
 dslite_set_b4_ip6_addr (dslite_main_t * dm, ip6_address_t * addr)
 {
+  if (!dm->is_enabled)
+    dslite_init_datastructures ();
+
   if (dm->is_ce)
     {
       dpo_id_t dpo = DPO_INVALID;
diff --git a/src/plugins/nat/dslite/dslite.h b/src/plugins/nat/dslite/dslite.h
index 8cb73d88409..3c798bf54fe 100644
--- a/src/plugins/nat/dslite/dslite.h
+++ b/src/plugins/nat/dslite/dslite.h
@@ -127,6 +127,7 @@ typedef struct
    * otherwise it behaves as AFTR */
   u8 is_ce;
 
+  u8 is_enabled;
   u16 msg_id_base;
 } dslite_main_t;