netdev - Re: [PATCH net-next] net: ipv6: add IFLA_RA_MTU to expose mtu value in the RA message

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Date:   Thu, 29 Jul 2021 08:41:17 -0600
From:   David Ahern <dsahern@...il.com>
To:     Rocco Yue <rocco.yue@...iatek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com,
        rocco.yue@...il.com, chao.song@...iatek.com,
        zhuoliang.zhang@...iatek.com
Subject: Re: [PATCH net-next] net: ipv6: add IFLA_RA_MTU to expose mtu value
 in the RA message

On 7/29/21 3:02 AM, Rocco Yue wrote:
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index 4882e81514b6..ea6c872c5f2c 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -347,7 +347,7 @@ enum {
>  	 */
>  	IFLA_PARENT_DEV_NAME,
>  	IFLA_PARENT_DEV_BUS_NAME,
> -
> +	IFLA_RA_MTU,
>  	__IFLA_MAX
>  };
>  
> diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
> index 70603775fe91..3dbcf212b766 100644
> --- a/include/uapi/linux/ipv6.h
> +++ b/include/uapi/linux/ipv6.h
> @@ -190,6 +190,7 @@ enum {
>  	DEVCONF_NDISC_TCLASS,
>  	DEVCONF_RPL_SEG_ENABLED,
>  	DEVCONF_RA_DEFRTR_METRIC,
> +	DEVCONF_RA_MTU,
>  	DEVCONF_MAX
>  };
>  

you do not need both IFLA and DEVCONF. Drop the DEVCONF completely. IFLA
attribute can be used for both inspection and notification on change.