1 files changed, 17 insertions, 0 deletions
diff --git a/src/vnet/ip/ip.c b/src/vnet/ip/ip.c
index 785cd491b57..88eff4f4d59 100644
--- a/src/vnet/ip/ip.c
+++ b/src/vnet/ip/ip.c
@@ -312,6 +312,23 @@ format_ip_dscp (u8 * s, va_list * va)
   return (format (s, "unknown"));
 }
 
+u8 *
+format_ip_ecn (u8 * s, va_list * va)
+{
+  ip_ecn_t ecn = va_arg (*va, u32);	// int promotion of u8
+
+  switch (ecn)
+    {
+#define _(n,v)                                                  \
+    case IP_ECN_##v:                                           \
+      return (format (s, "%s", #v));
+      foreach_ip_ecn
+#undef _
+    }
+
+  return (format (s, "unknown"));
+}
+
 /*
  * fd.io coding-style-patch-verification: ON
  *