nat: ignore user hash in ED NAT

With port overloading, port is no longer a scarce resource and there
is no need to limit connections per internal IP. This saves one hash
insert in slow path.

Type: improvement

Change-Id: I8a7a9713ac855fa99fa1617ec684f757cf6e09ae
Signed-off-by: Klement Sekera <ksekera@cisco.com>

1 files changed, 14 insertions, 8 deletions

diff --git a/src/plugins/nat/nat44/inlines.h b/src/plugins/nat/nat44/inlines.h
index 541770ad102..3c88e15c05e 100644
--- a/src/plugins/nat/nat44/inlines.h
+++ b/src/plugins/nat/nat44/inlines.h
@@ -53,6 +53,19 @@ nat44_session_reuse_old (snat_main_t * sm, snat_user_t * u,
   return s;
 }
 
+static_always_inline void
+nat44_global_lru_insert (snat_main_per_thread_data_t * tsm,
+			 snat_session_t * s, f64 now)
+{
+  dlist_elt_t *lru_list_elt;
+  pool_get (tsm->global_lru_pool, lru_list_elt);
+  s->global_lru_index = lru_list_elt - tsm->global_lru_pool;
+  clib_dlist_addtail (tsm->global_lru_pool, tsm->global_lru_head_index,
+		      s->global_lru_index);
+  lru_list_elt->value = s - tsm->sessions;
+  s->last_lru_update = now;
+}
+
 static_always_inline snat_session_t *
 nat44_session_alloc_new (snat_main_per_thread_data_t * tsm, snat_user_t * u,
 			 f64 now)
@@ -75,14 +88,7 @@ nat44_session_alloc_new (snat_main_per_thread_data_t * tsm, snat_user_t * u,
 		      s->per_user_list_head_index,
 		      per_user_translation_list_elt - tsm->list_pool);
 
-  dlist_elt_t *lru_list_elt;
-  pool_get (tsm->global_lru_pool, lru_list_elt);
-  s->global_lru_index = lru_list_elt - tsm->global_lru_pool;
-  clib_dlist_addtail (tsm->global_lru_pool, tsm->global_lru_head_index,
-		      s->global_lru_index);
-  lru_list_elt->value = s - tsm->sessions;
-  s->last_lru_update = now;
-
+  nat44_global_lru_insert (tsm, s, now);
   s->ha_last_refreshed = now;
   return s;
 }