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Date: Fri, 10 May 2024 07:05:58 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Matthieu Baerts <matttbe@...nel.org>, Manu Bretelle <chantra@...a.com>
Cc: 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@...com>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, bpf@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	Geliang Tang <tanggeliang@...inos.cn>
Subject: Re: [PATCH bpf-next v2 2/2] selftests/bpf: Add mptcp subflow subtest

On Thu, May 9, 2024 at 11:31 AM Matthieu Baerts <matttbe@...nel.org> wrote:
>
> Hello,
>
> On 09/05/2024 17:49, Matthieu Baerts (NGI0) wrote:
> > From: Geliang Tang <tanggeliang@...inos.cn>
> >
> > This patch adds a subtest named test_subflow to load and verify the newly
> > added mptcp subflow example in test_mptcp. Add a helper endpoint_init()
> > to add a new subflow endpoint. Add another helper ss_search() to verify the
> > fwmark and congestion values set by mptcp_subflow prog using setsockopts.
> >
> > Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/76
> > Signed-off-by: Geliang Tang <tanggeliang@...inos.cn>
> > Reviewed-by: Mat Martineau <martineau@...nel.org>
> > Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
> > ---
> >  tools/testing/selftests/bpf/prog_tests/mptcp.c | 109 +++++++++++++++++++++++++
> >  1 file changed, 109 insertions(+)
> >
> > diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > index 274d2e033e39..6039b0ff3801 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
>
> (...)
>
> > @@ -340,10 +344,115 @@ static void test_mptcpify(void)
> >       close(cgroup_fd);
> >  }
> >
> > +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);
> > +     SYS(fail, "ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_2, flags);
>
> I just noticed that this command is failing on the BPF CI:
>
>   https://github.com/kernel-patches/bpf/actions/runs/9020020315?pr=7009
>
> Is it possible that an old version of IPRoute2 is installed?
> 'ip mptcp' is supported since v5.8.0 (from 2020).
>
> It looks like Ubuntu Focal 20.04 is being used, which has the v5.5.0. Do
> we then need to find another way to set the MPTCP endpoints?


Manu, any idea?

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