mlxsw: spectrum_ipip: Handle underlay device change

When a bound device of an IP-in-IP tunnel changes, such as through
'ip tunnel change name $name dev $dev', the loopback backing the tunnel
needs to be recreated.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
index 5f78fc5..7502e53 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
@@ -326,8 +326,9 @@ mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
 		}
 
 		update_tunnel = true;
-	} else if (mlxsw_sp_ipip_parms_okey(ipip_entry->parms) !=
-		   mlxsw_sp_ipip_parms_okey(new_parms)) {
+	} else if ((mlxsw_sp_ipip_parms_okey(ipip_entry->parms) !=
+		    mlxsw_sp_ipip_parms_okey(new_parms)) ||
+		   ipip_entry->parms.link != new_parms.link) {
 		update_tunnel = true;
 	} else if (!mlxsw_sp_l3addr_eq(&new_daddr, &old_daddr)) {
 		update_nhs = true;