VXLAN: Prevent duplicate bypass graph nodes.

Change-Id: I68cc509b594b09751ff5e0e09bbca187a4a88edd
Signed-off-by: Jon Loeliger <jdl@netgate.com>

2 files changed, 37 insertions, 4 deletions

diff --git a/src/vnet/vxlan/vxlan.c b/src/vnet/vxlan/vxlan.c
index a26428673c5..ff796ec0673 100644
--- a/src/vnet/vxlan/vxlan.c
+++ b/src/vnet/vxlan/vxlan.c
@@ -919,12 +919,38 @@ VLIB_CLI_COMMAND (show_vxlan_tunnel_command, static) = {
 void
 vnet_int_vxlan_bypass_mode (u32 sw_if_index, u8 is_ip6, u8 is_enable)
 {
+  vxlan_main_t *vxm = &vxlan_main;
+
+  if (pool_is_free_index (vxm->vnet_main->interface_main.sw_interfaces,
+			  sw_if_index))
+    return;
+
+  is_enable = ! !is_enable;
+
   if (is_ip6)
-    vnet_feature_enable_disable ("ip6-unicast", "ip6-vxlan-bypass",
-				 sw_if_index, is_enable, 0, 0);
+    {
+      if (clib_bitmap_get (vxm->bm_ip6_bypass_enabled_by_sw_if, sw_if_index)
+	  != is_enable)
+	{
+	  vnet_feature_enable_disable ("ip6-unicast", "ip6-vxlan-bypass",
+				       sw_if_index, is_enable, 0, 0);
+	  vxm->bm_ip6_bypass_enabled_by_sw_if =
+	    clib_bitmap_set (vxm->bm_ip6_bypass_enabled_by_sw_if,
+			     sw_if_index, is_enable);
+	}
+    }
   else
-    vnet_feature_enable_disable ("ip4-unicast", "ip4-vxlan-bypass",
-				 sw_if_index, is_enable, 0, 0);
+    {
+      if (clib_bitmap_get (vxm->bm_ip4_bypass_enabled_by_sw_if, sw_if_index)
+	  != is_enable)
+	{
+	  vnet_feature_enable_disable ("ip4-unicast", "ip4-vxlan-bypass",
+				       sw_if_index, is_enable, 0, 0);
+	  vxm->bm_ip4_bypass_enabled_by_sw_if =
+	    clib_bitmap_set (vxm->bm_ip4_bypass_enabled_by_sw_if,
+			     sw_if_index, is_enable);
+	}
+    }
 }
 
 
@@ -1216,6 +1242,9 @@ vxlan_init (vlib_main_t * vm)
   vnet_flow_get_range (vxm->vnet_main, "vxlan", 1024 * 1024,
 		       &vxm->flow_id_start);
 
+  vxm->bm_ip4_bypass_enabled_by_sw_if = 0;
+  vxm->bm_ip6_bypass_enabled_by_sw_if = 0;
+
   /* initialize the ip6 hash */
   clib_bihash_init_16_8 (&vxm->vxlan4_tunnel_by_key, "vxlan4",
 			 VXLAN_HASH_NUM_BUCKETS, VXLAN_HASH_MEMORY_SIZE);
diff --git a/src/vnet/vxlan/vxlan.h b/src/vnet/vxlan/vxlan.h
index 73052278a48..7ade7c009cd 100644
--- a/src/vnet/vxlan/vxlan.h
+++ b/src/vnet/vxlan/vxlan.h
@@ -172,6 +172,10 @@ typedef struct
   /* Mapping from sw_if_index to tunnel index */
   u32 *tunnel_index_by_sw_if_index;
 
+  /* graph node state */
+  uword *bm_ip4_bypass_enabled_by_sw_if;
+  uword *bm_ip6_bypass_enabled_by_sw_if;
+
   /* convenience */
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;