linux-kernel - Re: [PATCH bpf-next 1/4] selftests/bpf: Handle SIGINT when creating netns

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Date: Tue, 7 May 2024 07:43:39 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Cc: MPTCP Upstream <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>, LKML <linux-kernel@...r.kernel.org>, 
	Network Development <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, Geliang Tang <tanggeliang@...inos.cn>
Subject: Re: [PATCH bpf-next 1/4] selftests/bpf: Handle SIGINT when creating netns

On Tue, May 7, 2024 at 3:53 AM Matthieu Baerts (NGI0)
<matttbe@...nel.org> wrote:
>
> From: Geliang Tang <tanggeliang@...inos.cn>
>
> It's necessary to delete netns during the MPTCP bpf tests interrupt,
> otherwise the next tests run will fail due to unable to create netns.
>
> This patch adds a new SIGINT handle sig_int, and deletes NS_TEST in it.
>
> 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 | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> index 274d2e033e39..baf976a7a1dd 100644
> --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> @@ -64,11 +64,18 @@ struct mptcp_storage {
>         char ca_name[TCP_CA_NAME_MAX];
>  };
>
> +static void sig_int(int sig)
> +{
> +       signal(sig, SIG_IGN);
> +       SYS_NOFAIL("ip netns del %s", NS_TEST);
> +}
> +
>  static struct nstoken *create_netns(void)
>  {
>         SYS(fail, "ip netns add %s", NS_TEST);
>         SYS(fail, "ip -net %s link set dev lo up", NS_TEST);
>
> +       signal(SIGINT, sig_int);
>         return open_netns(NS_TEST);

That's a drop in the bucket.
ctrl-c of test_progs doesn't really work.
Such clean up needs to be generic as part of network_helpers.c