mlx5_query_pfcc_reg
err = mlx5_query_pfcc_reg(dev, out, sizeof(out));
err = mlx5_query_pfcc_reg(dev, out, sizeof(out));
err = mlx5_query_pfcc_reg(dev, out, sizeof(out));
err = mlx5_query_pfcc_reg(mdev, out, sizeof(out));