netdev - Re: [PATCH net-next v2] ipv6: add IFLA_INET6_RA_MTU to expose mtu value in the RA message

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Message-ID: <20210803115759.4342-1-rocco.yue@mediatek.com>
Date:   Tue, 3 Aug 2021 19:57:59 +0800
From:   Rocco Yue <rocco.yue@...iatek.com>
To:     David Ahern <dsahern@...nel.org>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <rocco.yue@...il.com>,
        <chao.song@...iatek.com>, <zhuoliang.zhang@...iatek.com>,
        Rocco Yue <rocco.yue@...iatek.com>
Subject: Re: [PATCH net-next v2] ipv6: add IFLA_INET6_RA_MTU to expose mtu value in the RA message

On Mon, 2021-08-02 at 07:35 -0600, David Ahern wrote:
> On 8/2/21 6:40 AM, Rocco Yue wrote:
>> 
>> Regarding setting "reject_message" in the policy, after reviewing
>> the code, I fell that it is unnecessary, because the cost of
>> implementing it seems to be a bit high, which requires modifying
>> the function interface. The reasons is as follows:
> 
> The policy can be setup now to do the right thing once the extack
> argument is available.
> 
> do_setlink() has an extack argument. It calls validate_linkmsg which
> calls validate_link_af meaning support can be added in a single patch.
> If you decide to do it, then it should be a separate patch preceding
> this one.
> 

Hi David,

Thanks for your advice,
I will send a separate patch to add extack arg firstly.

> Then userspace should get a link notification when ra_mtu is set so it
> does not have to poll.

It make sense, I will do it.

Thanks
Rocco