netdev - [PATCH mptcp-next v12 2/5] selftests/bpf: Use random netns name for mptcp

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Message-Id: <426ed18fcb9adb39bfc96cb444cc56636377c5f8.1691388735.git.geliang.tang@suse.com>
Date: Mon,  7 Aug 2023 14:22:42 +0800
From: Geliang Tang <geliang.tang@...e.com>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	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>,
	Florent Revest <revest@...omium.org>,
	Brendan Jackman <jackmanb@...omium.org>,
	Matthieu Baerts <matthieu.baerts@...sares.net>,
	Mat Martineau <martineau@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	John Johansen <john.johansen@...onical.com>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Stephen Smalley <stephen.smalley.work@...il.com>,
	Eric Paris <eparis@...isplace.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>,
	Simon Horman <horms@...nel.org>
Cc: Geliang Tang <geliang.tang@...e.com>,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	mptcp@...ts.linux.dev,
	apparmor@...ts.ubuntu.com,
	linux-security-module@...r.kernel.org,
	selinux@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Yonghong Song <yonghong.song@...ux.dev>
Subject: [PATCH mptcp-next v12 2/5] selftests/bpf: Use random netns name for mptcp

When running mptcp tests simultaneously, it fails sometimes with
"Cannot create namespace file "/var/run/netns/mptcp_ns": File exists"
errors. So this patch uses rand() to generate a random netns name
instead of using the fixed name "mptcp_ns" for every test.

Add "ip netns show" after "ip netns del" to check if there is a test
did not clean up its netns

By doing that, we can re-launch the test even if there was an issue
removing the previous netns or if by accident, a netns with this
generic name already existed on the system.

Note that using a different name each will also help adding more
subtests in future commits.

Acked-by: Yonghong Song <yonghong.song@...ux.dev>
Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: Geliang Tang <geliang.tang@...e.com>
---
 tools/testing/selftests/bpf/prog_tests/mptcp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
index cd0c42fff7c0..b2d41024c6c2 100644
--- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
+++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
@@ -7,7 +7,7 @@
 #include "network_helpers.h"
 #include "mptcp_sock.skel.h"
 
-#define NS_TEST "mptcp_ns"
+char NS_TEST[32];
 
 #ifndef TCP_CA_NAME_MAX
 #define TCP_CA_NAME_MAX	16
@@ -147,6 +147,8 @@ static void test_base(void)
 	if (!ASSERT_GE(cgroup_fd, 0, "test__join_cgroup"))
 		return;
 
+	srand(time(NULL));
+	snprintf(NS_TEST, sizeof(NS_TEST), "mptcp_ns_%d", rand());
 	SYS(fail, "ip netns add %s", NS_TEST);
 	SYS(fail, "ip -net %s link set dev lo up", NS_TEST);
 
@@ -178,6 +180,7 @@ static void test_base(void)
 		close_netns(nstoken);
 
 	SYS_NOFAIL("ip netns del " NS_TEST " &> /dev/null");
+	SYS_NOFAIL("ip netns show %s", NS_TEST);
 
 	close(cgroup_fd);
 }
-- 
2.35.3