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

From: Rocco Yue
Date: Tue Aug 03 2021 - 08:14:40 EST

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.