netdev - Re: [PATCH net] ipv6: Reflect MTU changes on PMTU of exceptions for MTU-less routes

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Date:   Fri, 2 Mar 2018 15:39:03 -0700
From:   David Ahern <dsahern@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Wei Wang <weiwan@...gle.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Maciej Żenczykowski <maze@...gle.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] ipv6: Reflect MTU changes on PMTU of exceptions for
 MTU-less routes

On 3/2/18 8:36 AM, Stefano Brivio wrote:
> Currently, administrative MTU changes on a given netdevice are
> not reflected on route exceptions for MTU-less routes, with a
> set PMTU value, for that device:
> 
>  # ip -6 route get 3000::b
>  3000::b from :: dev vti_a proto kernel src 3000::a metric 256 pref medium
>  # ping6 -c 1 -q -s10000 3000::b > /dev/null
>  # ip netns exec a ip -6 route get 3000::b
>  3000::b from :: dev vti_a src 3000::a metric 0
>      cache expires 571sec mtu 4926 pref medium
>  # ip link set dev vti_a mtu 3000
>  # ip -6 route get 3000::b
>  3000::b from :: dev vti_a src 3000::a metric 0
>      cache expires 571sec mtu 4926 pref medium
>  # ip link set dev vti_a mtu 9000
>  # ip -6 route get 3000::b
>  3000::b from :: dev vti_a src 3000::a metric 0
>      cache expires 571sec mtu 4926 pref medium

Addresses in the 2001:db8: range should be used for commit messages.

And please codify the above expectation as a test under
tools/testing/selftests/net