netdev - Re: [net 13/15] net/mlx5e: MACsec, remove replay window size limitation in offload path

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Date:   Mon, 28 Nov 2022 15:42:19 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
CC:     Saeed Mahameed <saeedm@...dia.com>, <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Emeel Hakim <ehakim@...dia.com>, Raed Salem <raeds@...dia.com>
Subject: Re: [net 13/15] net/mlx5e: MACsec, remove replay window size
 limitation in offload path



On 11/24/2022 12:10 AM, Saeed Mahameed wrote:
> From: Emeel Hakim <ehakim@...dia.com>
> 
> Currently offload path limits replay window size to 32/64/128/256 bits,
> such a limitation should not exist since software allows it.
> Remove such limitation.
> 
> Fixes: eb43846b43c3 ("net/mlx5e: Support MACsec offload replay window")
> Signed-off-by: Emeel Hakim <ehakim@...dia.com>
> Reviewed-by: Raed Salem <raeds@...dia.com>
> Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
> ---
>   .../mellanox/mlx5/core/en_accel/macsec.c         | 16 ----------------
>   include/linux/mlx5/mlx5_ifc.h                    |  7 -------
>   2 files changed, 23 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
> index c19581f1f733..72f8be65fa90 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
> @@ -229,22 +229,6 @@ static int macsec_set_replay_protection(struct mlx5_macsec_obj_attrs *attrs, voi
>   	if (!attrs->replay_protect)
>   		return 0;
>   
> -	switch (attrs->replay_window) {
> -	case 256:
> -		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_256BIT;
> -		break;
> -	case 128:
> -		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_128BIT;
> -		break;
> -	case 64:
> -		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_64BIT;
> -		break;
> -	case 32:
> -		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_32BIT;
> -		break;
> -	default:
> -		return -EINVAL;
> -	}

What sets window_sz now? Looking at the current code wouldn't this leave 
window_sz uninitialized and this undefined behavior of MLX5_SET? Either 
you should just forward in attrs->replay_window and remove window_sz 
local or drop the MLX5_SET call for setting window size?

>   	MLX5_SET(macsec_aso, aso_ctx, window_size, window_sz);
>   	MLX5_SET(macsec_aso, aso_ctx, mode, MLX5_MACSEC_ASO_REPLAY_PROTECTION);
> > diff --git a/include/linux/mlx5/mlx5_ifc.h 
b/include/linux/mlx5/mlx5_ifc.h
> index 5a4e914e2a6f..981fc7dfa408 100644
> --- a/include/linux/mlx5/mlx5_ifc.h
> +++ b/include/linux/mlx5/mlx5_ifc.h
> @@ -11611,13 +11611,6 @@ enum {
>   	MLX5_MACSEC_ASO_REPLAY_PROTECTION = 0x1,
>   };
>   
> -enum {
> -	MLX5_MACSEC_ASO_REPLAY_WIN_32BIT  = 0x0,
> -	MLX5_MACSEC_ASO_REPLAY_WIN_64BIT  = 0x1,
> -	MLX5_MACSEC_ASO_REPLAY_WIN_128BIT = 0x2,
> -	MLX5_MACSEC_ASO_REPLAY_WIN_256BIT = 0x3,
> -};
> -
>   #define MLX5_MACSEC_ASO_INC_SN  0x2
>   #define MLX5_MACSEC_ASO_REG_C_4_5 0x2
>