lib: optimize vrf_id_to_name(VRF_DEFAULT) case

vrf_id_to_name() looks up in a RB_TREE to find the VRF entry, then
reads the name.

Avoid it for VRF_DEFAULT, which always exists and for which the
translation is straightforward.

Signed-off-by: Christophe Gouault <christophe.gouault@6wind.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/vrf.c b/lib/vrf.c
index cc7445558..a7e9b256f 100644
--- a/lib/vrf.c
+++ b/lib/vrf.c
@@ -331,6 +331,9 @@ const char *vrf_id_to_name(vrf_id_t vrf_id)
 {
 	struct vrf *vrf;
 
+	if (vrf_id == VRF_DEFAULT)
+		return VRF_DEFAULT_NAME;
+
 	vrf = vrf_lookup_by_id(vrf_id);
 	return VRF_LOGNAME(vrf);
 }