netdev - Re: [PATCH net-next V3 08/11] net/mlx5_core: Set/Query port MTU commands

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Date:	Sun, 10 May 2015 19:32:11 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Amir Vadai <amirv@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
	Tal Alon <talal@...lanox.com>,
	Achiad Shochat <achiad@...lanox.com>,
	Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: [PATCH net-next V3 08/11] net/mlx5_core: Set/Query port MTU commands

Hello.

On 5/10/2015 12:39 PM, Amir Vadai wrote:

> From: Saeed Mahameed <saeedm@...lanox.com>

> Introduce set/Query low level functions to access MTU in hardware. To be
> used by the netdev.

> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
> Signed-off-by: Amir Vadai <amirv@...lanox.com>
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/port.c | 56 ++++++++++++++++++++++++++
>   include/linux/mlx5/driver.h                    |  4 ++
>   2 files changed, 60 insertions(+)

> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c b/drivers/net/ethernet/mellanox/mlx5/core/port.c
> index 742a6fb..e56a0b6 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c
> @@ -211,3 +211,59 @@ int mlx5_query_port_status(struct mlx5_core_dev *dev, u8 *status)
[...]
> +int mlx5_set_port_mtu(struct mlx5_core_dev *dev, int mtu)
> +{
> +	u32 in[MLX5_ST_SZ_DW(pmtu_reg)];
> +	u32 out[MLX5_ST_SZ_DW(pmtu_reg)];
> +	int err;
> +
> +	memset(in, 0, sizeof(in));
> +
> +	MLX5_SET(pmtu_reg, in, admin_mtu, mtu);
> +	MLX5_SET(pmtu_reg, in, local_port, 1);
> +
> +	err = mlx5_core_access_reg(dev, in, sizeof(in), out,
> +				   sizeof(out), MLX5_REG_PMTU, 0, 1);
> +
> +	return err;

    Why not just return directly?

[...]

WBR, Sergei

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