[PATCH bpf-next v1] selftests/bpf: Improve tc_tunnel test reliability

[Jiayuan Chen <jiayuan.chen@linux.dev>]

From: Jiayuan Chen <jiayuan.chen@shopee.com>

A test failure was discovered in BPF CI [1] caused by connection timeout.
The current test timeout of 500ms is insufficient for CI environments,
particularly under high load.

While the optimal timeout is unclear, this test was converted from the
original test_tc_tunnel.sh script. The original script used nc with "-w 1"
to specify a 1-second timeout [2]. Therefore, this test restores the
timeout to 1s.

Test:
./test_progs -a tc_tunnel
 #478/1   tc_tunnel/ipip_none:OK
 #478/2   tc_tunnel/ipip6_none:OK
 #478/3   tc_tunnel/ip6tnl_none:OK
 #478/4   tc_tunnel/sit_none:OK
 #478/5   tc_tunnel/vxlan_eth:OK
 #478/6   tc_tunnel/ip6vxlan_eth:OK
 #478/7   tc_tunnel/gre_none:OK
 #478/8   tc_tunnel/gre_eth:OK
 #478/9   tc_tunnel/gre_mpls:OK
 #478/10  tc_tunnel/ip6gre_none:OK
 #478/11  tc_tunnel/ip6gre_eth:OK
 #478/12  tc_tunnel/ip6gre_mpls:OK
 #478/13  tc_tunnel/udp_none:OK
 #478/14  tc_tunnel/udp_eth:OK
 #478/15  tc_tunnel/udp_mpls:OK
 #478/16  tc_tunnel/ip6udp_none:OK
 #478/17  tc_tunnel/ip6udp_eth:OK
 #478/18  tc_tunnel/ip6udp_mpls:OK
 #478     tc_tunnel:OK
 Summary: 1/18 PASSED, 0 SKIPPED, 0 FAILED

[1] https://github.com/kernel-patches/bpf/actions/runs/22674350732/job/65728072723
[2] https://lore.kernel.org/all/20251027-tc_tunnel-v3-4-505c12019f9d@bootlin.com/

Cc: Jiayuan Chen <jiayuan.chen@linux.dev>
Signed-off-by: Jiayuan Chen <jiayuan.chen@shopee.com>
---
 tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c b/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c
index 7fc4d7dd70eff..23b5c522ea9fa 100644
--- a/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c
+++ b/tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c
@@ -168,7 +168,7 @@ static int check_server_rx_data(struct subtest_cfg *cfg,
 
 static struct connection *connect_client_to_server(struct subtest_cfg *cfg)
 {
-	struct network_helper_opts opts = {.timeout_ms = 500};
+	struct network_helper_opts opts = {.timeout_ms = 1000};
 	int family = cfg->ipproto == 6 ? AF_INET6 : AF_INET;
 	struct connection *conn = NULL;
 	int client_fd, server_fd;
-- 
2.43.0