mlx4_get_slave_from_roce_gid
err = mlx4_get_slave_from_roce_gid(dev->dev, port, dgid.raw, &slave);
err = mlx4_get_slave_from_roce_gid(dev->dev, other_port, dgid.raw, &slave);
EXPORT_SYMBOL(mlx4_get_slave_from_roce_gid);
int mlx4_get_slave_from_roce_gid(struct mlx4_dev *dev, int port, u8 *gid,