netdev - Re: [PATCH net-next 00/10 v2] selftests: pmtu: Add further vti/vti6 MTU and PMTU tests

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Date:   Sun, 18 Mar 2018 11:31:10 -0600
From:   David Ahern <dsahern@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Sabrina Dubroca <sd@...asysnail.net>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 00/10 v2] selftests: pmtu: Add further vti/vti6
 MTU and PMTU tests

On 3/16/18 7:31 PM, Stefano Brivio wrote:
> Patches 5/10 to 10/10 add tests to verify default MTU assignment
> for vti4 and vti6 interfaces, to check that MTU values set on new
> link and link changes are properly taken and validated, and to
> verify PMTU exceptions on vti4 interfaces.
> 
> Patch 1/10 reverses function return codes as suggested by David
> Ahern.
> 
> Patch 2/10 fixes the helper to fetch exceptions MTU to run in the
> passed namespace.
> 
> Patches 3/10 and 4/10 are preparation work to make it easier to
> introduce those tests.
> 
> v2: Reverse return codes, and make output prettier in 4/9 by
>     using padded printf, test descriptions and buffered error
>     strings. Remove accidental output to /dev/kmsg from 10/10
>     (was 9/9).

pulling pmtu.sh from net-next I see log messages on console:

[  890.741117] ip netns exec ns-kFUQx6 ip link set vti6_a type vti6
remote fc00:1001::0 local fc00:1001::0
[  890.837569] ip netns exec ns-kFUQx6 ip link set vti6_a mtu 1280 type
vti6 remote fc00:1000::0 local fc00:1000::0