mlx4_SET_PORT_user_mtu
err = mlx4_SET_PORT_user_mtu(mdev->dev, priv->port, dev->mtu);
EXPORT_SYMBOL(mlx4_SET_PORT_user_mtu);
int mlx4_SET_PORT_user_mtu(struct mlx4_dev *dev, u8 port, u16 user_mtu);