linux-kernel - Re: [PATCH bpf-next v4 2/2] selftests/bpf: Add mptcp subflow subtest

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Message-ID: <0201ab87-5f65-4287-bda2-d170a90ae458@kernel.org>
Date: Thu, 22 Aug 2024 11:13:51 +0200
From: Matthieu Baerts <matttbe@...nel.org>
To: Manu Bretelle <chantra@...a.com>, Martin KaFai Lau <martin.lau@...ux.dev>
Cc: "mptcp@...ts.linux.dev" <mptcp@...ts.linux.dev>,
 Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>,
 Andrii Nakryiko <andrii@...nel.org>, Eduard Zingerman <eddyz87@...il.com>,
 Mykola Lysenko <mykolal@...a.com>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 "sdf@...ichev.me" <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
 "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
 Daniel Xu <dxu@...uu.xyz>
Subject: Re: [PATCH bpf-next v4 2/2] selftests/bpf: Add mptcp subflow subtest

Hi Manu,

On 21/08/2024 22:32, Manu Bretelle wrote:
> 
> 
>> On Aug 13, 2024, at 6:12 PM, Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>>
>>>
>> On 8/5/24 2:52 AM, Matthieu Baerts (NGI0) wrote:
>>> +static int endpoint_init(char *flags)
>>> +{
>>> + SYS(fail, "ip -net %s link add veth1 type veth peer name veth2", NS_TEST);
>>> + SYS(fail, "ip -net %s addr add %s/24 dev veth1", NS_TEST, ADDR_1);
>>> + SYS(fail, "ip -net %s link set dev veth1 up", NS_TEST);
>>> + SYS(fail, "ip -net %s addr add %s/24 dev veth2", NS_TEST, ADDR_2);
>>> + SYS(fail, "ip -net %s link set dev veth2 up", NS_TEST);
>>> + if (SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_2, flags)) {
>>> + printf("'ip mptcp' not supported, skip this test.\n");
>>> + test__skip();
>>
>> It is always a skip now in bpf CI:
>>
>> #171/3   mptcp/subflow:SKIP
>>
>> This test is a useful addition for the bpf CI selftest.
>>
>> It can't catch regression if it is always a skip in bpf CI though.
>>
>> iproute2 needs to be updated (cc: Daniel Xu and Manu, the outdated iproute2 is something that came up multiple times).
>>
>> Not sure when the iproute2 can be updated. In the mean time, your v3 is pretty close to getting pm_nl_ctl compiled. Is there other blocker on this?
> 
> I have updated runners to Ubuntu 24.04 which comes with:
> root@...d5d75581b:/actions-runner# ip --json -V
> ip utility, iproute2-6.1.0, libbpf 1.3.0
> root@...d5d75581b:/actions-runner# ip mptcp help
> Usage:  ip mptcp endpoint add ADDRESS [ dev NAME ] [ id ID ]
>                                       [ port NR ] [ FLAG-LIST ]
>         ip mptcp endpoint delete id ID [ ADDRESS ]
>         ip mptcp endpoint change [ id ID ] [ ADDRESS ] [ port NR ] CHANGE-OPT
>         ip mptcp endpoint show [ id ID ]
>         ip mptcp endpoint flush
>         ip mptcp limits set [ subflows NR ] [ add_addr_accepted NR ]
>         ip mptcp limits show
>         ip mptcp monitor
> FLAG-LIST := [ FLAG-LIST ] FLAG
> FLAG  := [ signal | subflow | backup | fullmesh ]
> CHANGE-OPT := [ backup | nobackup | fullmesh | nofullmesh ]
> 
> Assuming I don’t need to revert back to old runners due to unrelated issue, you should now have `ip mptcp` available.

Great, thank you for this update, that will ease the inclusion of this
series!

(That's a shame Ubuntu 24.04 didn't come with IPRoute 6.8, same version
as their default kernel [1]... but that's not blocking us here)

[1] https://bugs.launchpad.net/ubuntu/+source/iproute2/+bug/2051672

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.