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authorKlement Sekera <ksekera@cisco.com>2020-04-05 10:22:47 +0200
committerKlement Sekera <ksekera@cisco.com>2020-04-08 11:07:49 +0200
commitba5f9bc7534bcf58225b0658993728b1f4d47a67 (patch)
treea3ca0cea8eea85910e050808c8df37bf802cd393 /src/plugins/nat/nat44
parent248ce43c6d79b79597e28f19615e83d2bb0a9276 (diff)
nat: ED: global session LRU list
Maintain a global session LRU allowing reuse of expired session instead of relying on a scavenging mechanism to periodically walk sessions. Whenever a new session is being allocated in slow path, also attempt to free an expired session from global LRU list. Type: improvement Signed-off-by: Klement Sekera <ksekera@cisco.com> Change-Id: I9edde9ec138de67c9a4888e915b0490ec16415fa
Diffstat (limited to 'src/plugins/nat/nat44')
-rw-r--r--src/plugins/nat/nat44/inlines.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44/inlines.h b/src/plugins/nat/nat44/inlines.h
index fcaf57383ef..631c4cd4104 100644
--- a/src/plugins/nat/nat44/inlines.h
+++ b/src/plugins/nat/nat44/inlines.h
@@ -89,6 +89,14 @@ 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;
+
s->ha_last_refreshed = now;
return s;
}
@@ -207,6 +215,8 @@ nat44_user_session_cleanup (snat_user_t * u, u32 thread_index, f64 now)
clib_dlist_remove (tsm->list_pool, s->per_user_index);
pool_put_index (tsm->list_pool, s->per_user_index);
+ clib_dlist_remove (tsm->global_lru_pool, s->global_lru_index);
+ pool_put_index (tsm->global_lru_pool, s->global_lru_index);
pool_put (tsm->sessions, s);
vlib_set_simple_counter (&sm->total_sessions, thread_index, 0,
pool_elts (tsm->sessions));