netdev - Re: [PATCH bpf-next/net v5 3/3] selftests/bpf: Add mptcp subflow subtest

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Message-ID: <77443af4-c16e-4bcc-84bd-d808f12b9770@kernel.org>
Date: Tue, 10 Sep 2024 16:55:29 +0200
From: Matthieu Baerts <matttbe@...nel.org>
To: 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@...ichev.me>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 bpf@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next/net v5 3/3] selftests/bpf: Add mptcp subflow
 subtest

Hello,

On 10/09/2024 16:13, Matthieu Baerts (NGI0) wrote:
> From: Geliang Tang <tanggeliang@...inos.cn>
> 
> This patch adds a subtest named test_subflow in test_mptcp to load and
> verify the newly added MPTCP subflow BPF program. To goal is to make
> sure it is possible to set different socket options per subflows, while
> the userspace socket interface only lets the application to set the same
> socket options for the whole MPTCP connection and its multiple subflows.
> 
> To check that, a client and a server are started in a dedicated netns,
> with veth interfaces to simulate multiple paths. They will exchange data
> to allow the creation of an additional subflow.

(...)

> diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> index d2ca32fa3b21..c30f032edaca 100644
> --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> @@ -335,10 +339,132 @@ static void test_mptcpify(void)
>  	close(cgroup_fd);
>  }

(...)

> +static void wait_for_new_subflows(int fd)
> +{
> +	socklen_t len;
> +	u8 subflows;
> +	int err, i;
> +
> +	len = sizeof(subflows);
> +	/* Wait max 1 sec for new subflows to be created */
> +	for (i = 0; i < 10; i++) {
> +		err = getsockopt(fd, SOL_MPTCP, MPTCP_INFO, &subflows, &len);
> +		if (!err && subflows > 0)
> +			break;
> +
> +		sleep(0.1);

As reported by the CI, we are not in Python, usleep() should be used
here. I missed that one during my review. I will send a new version with
the fix tomorrow. Sorry for the noise.

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