net: switchdev: support static FDB addresses

This patch adds a is_static boolean to the switchdev_obj_fdb structure,
in order to set the ndm_state to either NUD_NOARP or NUD_REACHABLE.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/switchdev.h

@@ -72,6 +72,7 @@ struct switchdev_obj {
 		struct switchdev_obj_fdb {		/* PORT_FDB */
 			u8 addr[ETH_ALEN];
 			u16 vid;
+			bool is_static;
 		} fdb;
 	} u;
 };

net/switchdev/switchdev.c

@@ -811,7 +811,7 @@ static int switchdev_port_fdb_dump_cb(struct net_device *dev,
 	ndm->ndm_flags   = NTF_SELF;
 	ndm->ndm_type    = 0;
 	ndm->ndm_ifindex = dev->ifindex;
-	ndm->ndm_state   = NUD_REACHABLE;
+	ndm->ndm_state   = obj->u.fdb.is_static ? NUD_NOARP : NUD_REACHABLE;
 
 	if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, obj->u.fdb.addr))
 		goto nla_put_failure;