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-rw-r--r--include/uapi/linux/neighbour.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/uapi/linux/neighbour.h b/include/uapi/linux/neighbour.h
index dc8b72201f6c..00a60695fa53 100644
--- a/include/uapi/linux/neighbour.h
+++ b/include/uapi/linux/neighbour.h
@@ -66,8 +66,11 @@ enum {
#define NUD_NONE 0x00
/* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
- and make no address resolution or NUD.
- NUD_PERMANENT also cannot be deleted by garbage collectors.
+ * and make no address resolution or NUD.
+ * NUD_PERMANENT also cannot be deleted by garbage collectors.
+ * When NTF_EXT_LEARNED is set for a bridge fdb entry the different cache entry
+ * states don't make sense and thus are ignored. Such entries don't age and
+ * can roam.
*/
struct nda_cacheinfo {