From: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
There is a report that fib_lookup test is flaky when running in parallel.
A symptom of slowness or delay. An example:
Testing IPv6 stale neigh
set_lookup_params:PASS:inet_pton(IPV6_IFACE_ADDR) 0 nsec
test_fib_lookup:PASS:bpf_prog_test_run_opts 0 nsec
test_fib_lookup:FAIL:fib_lookup_ret unexpected fib_lookup_ret: actual 0 != expected 7
test_fib_lookup:FAIL:dmac not match unexpected dmac not match: actual 1 != expected 0
dmac expected 11:11:11:11:11:11 actual 00:00:00:00:00:00
[ Note that the "fib_lookup_ret unexpected fib_lookup_ret actual 0 ..."
is reversed in terms of expected and actual value. Fixing in this
patch also. ]
One possibility is the testing stale neigh entry was marked dead by the
gc (in neigh_periodic_work). The default gc_stale_time sysctl is 60s.
This patch increases it to 15 mins.
It also:
- fixes the reversed arg (actual vs expected) in one of the
ASSERT_EQ test
- removes the nodad command arg when adding v4 neigh entry which
currently has a warning.
Fixes: 168de0233586 ("selftests/bpf: Add bpf_fib_lookup test")
Reported-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
---
v2: Fix a typo in commit message. s/5/15/ mins.
Fix assert message.
tools/testing/selftests/bpf/prog_tests/fib_lookup.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/fib_lookup.c b/tools/testing/selftests/bpf/prog_tests/fib_lookup.c
index 429393caf612..a1e712105811 100644
--- a/tools/testing/selftests/bpf/prog_tests/fib_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/fib_lookup.c
@@ -54,11 +54,19 @@ static int setup_netns(void)
SYS(fail, "ip link add veth1 type veth peer name veth2");
SYS(fail, "ip link set dev veth1 up");
+ err = write_sysctl("/proc/sys/net/ipv4/neigh/veth1/gc_stale_time", "900");
+ if (!ASSERT_OK(err, "write_sysctl(net.ipv4.neigh.veth1.gc_stale_time)"))
+ goto fail;
+
+ err = write_sysctl("/proc/sys/net/ipv6/neigh/veth1/gc_stale_time", "900");
+ if (!ASSERT_OK(err, "write_sysctl(net.ipv6.neigh.veth1.gc_stale_time)"))
+ goto fail;
+
SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR);
SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV6_NUD_FAILED_ADDR);
SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV6_NUD_STALE_ADDR, DMAC);
- SYS(fail, "ip addr add %s/24 dev veth1 nodad", IPV4_IFACE_ADDR);
+ SYS(fail, "ip addr add %s/24 dev veth1", IPV4_IFACE_ADDR);
SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV4_NUD_FAILED_ADDR);
SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV4_NUD_STALE_ADDR, DMAC);
@@ -158,7 +166,7 @@ void test_fib_lookup(void)
if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))
continue;
- ASSERT_EQ(tests[i].expected_ret, skel->bss->fib_lookup_ret,
+ ASSERT_EQ(skel->bss->fib_lookup_ret, tests[i].expected_ret,
"fib_lookup_ret");
ret = memcmp(tests[i].dmac, fib_params->dmac, sizeof(tests[i].dmac));
--
2.34.1
