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Message-ID: <8781d9c2-2352-ac0b-9d79-82be8eb404ff@linux.dev>
Date: Wed, 22 Feb 2023 15:44:17 -0800
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Hangbin Liu <liuhangbin@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
Jakub Kicinski <kuba@...nel.org>,
"David S . Miller" <davem@...emloft.net>,
Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
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>,
Mykola Lysenko <mykolal@...com>,
Felix Maurer <fmaurer@...hat.com>,
Matthieu Baerts <matthieu.baerts@...sares.net>,
mptcp@...ts.linux.dev, netdev@...r.kernel.org
Subject: Re: [PATCHv2 bpf-next] selftests/bpf: run mptcp in a dedicated netns
On 2/18/23 11:01 PM, Hangbin Liu wrote:
> The current mptcp test is run in init netns. If the user or default
> system config disabled mptcp, the test will fail. Let's run the mptcp
> test in a dedicated netns to avoid none kernel default mptcp setting.
>
> Suggested-by: Martin KaFai Lau <martin.lau@...ux.dev>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
> v2: remove unneed close_cgroup_fd goto label.
> ---
> .../testing/selftests/bpf/prog_tests/mptcp.c | 27 +++++++++++++++++--
> 1 file changed, 25 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> index 59f08d6d1d53..dbe2bcfd3b38 100644
> --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> @@ -7,6 +7,16 @@
> #include "network_helpers.h"
> #include "mptcp_sock.skel.h"
>
> +#define SYS(fmt, ...) \
> + ({ \
> + char cmd[1024]; \
> + snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
> + if (!ASSERT_OK(system(cmd), cmd)) \
> + goto fail; \
> + })
> +
> +#define NS_TEST "mptcp_ns"
> +
> #ifndef TCP_CA_NAME_MAX
> #define TCP_CA_NAME_MAX 16
> #endif
> @@ -138,12 +148,20 @@ static int run_test(int cgroup_fd, int server_fd, bool is_mptcp)
>
> static void test_base(void)
> {
> + struct nstoken *nstoken = NULL;
> int server_fd, cgroup_fd;
>
> cgroup_fd = test__join_cgroup("/mptcp");
> if (!ASSERT_GE(cgroup_fd, 0, "test__join_cgroup"))
> return;
>
> + SYS("ip netns add %s", NS_TEST);
> + SYS("ip -net %s link set dev lo up", NS_TEST);
> +
> + nstoken = open_netns(NS_TEST);
> + if (!ASSERT_OK_PTR(nstoken, "open_netns"))
> + goto fail;
> +
> /* without MPTCP */
> server_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0);
> if (!ASSERT_GE(server_fd, 0, "start_server"))
> @@ -157,13 +175,18 @@ static void test_base(void)
> /* with MPTCP */
> server_fd = start_mptcp_server(AF_INET, NULL, 0, 0);
> if (!ASSERT_GE(server_fd, 0, "start_mptcp_server"))
> - goto close_cgroup_fd;
> + goto fail;
>
> ASSERT_OK(run_test(cgroup_fd, server_fd, true), "run_test mptcp");
>
> close(server_fd);
>
> -close_cgroup_fd:
> +fail:
> + if (nstoken)
> + close_netns(nstoken);
> +
> + system("ip netns del " NS_TEST " >& /dev/null");
It needs to be "&>", like the fix in commit 98e13848cf43 ("selftests/bpf: Fix
decap_sanity_ns cleanup").
Since it needs to respin, could you help and take this chance to put the above
SYS() macro into the test_progs.h. Other selftests are doing similar thing also.
If possible, it may be easier to have a configurable "goto_label" as the first arg.
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