mlxsw: spectrum_switchdev: Add support for querying supported bridge flags

Add support for querying supported bridge flags.
Signed-off-by: Arkadi Sharshevsky <arkadis@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_switchdev.c

@@ -456,6 +456,9 @@ static int mlxsw_sp_port_attr_get(struct net_device *dev,
 		mlxsw_sp_port_bridge_flags_get(mlxsw_sp->bridge, attr->orig_dev,
 					       &attr->u.brport_flags);
 		break;
+	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
+		attr->u.brport_flags_support = BR_LEARNING | BR_FLOOD;
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}