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selftests: bpf: Reset global state between reuseport test runs

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[ Upstream commit 51bad0f05616c43d6d34b0a19bcc9bdab8e8fb39 ]

Currently, there is a lot of false positives if a single reuseport test
fails. This is because expected_results and the result map are not cleared.

Zero both after individual test runs, which fixes the mentioned false
positives.

Fixes: 91134d849a ("bpf: Test BPF_PROG_TYPE_SK_REUSEPORT")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200124112754.19664-5-lmb@cloudflare.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lorenz Bauer 2020-01-24 11:27:54 +00:00 committed by Greg Kroah-Hartman
parent dbf6515718
commit 634efb7504
1 changed files with 14 additions and 2 deletions
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16
tools/testing/selftests/bpf/test_select_reuseport.c
View file

@ -30,7 +30,7 @@
#define REUSEPORT_ARRAY_SIZE 32
static int result_map, tmp_index_ovr_map, linum_map, data_check_map;
static enum result expected_results[NR_RESULTS];
static __u32 expected_results[NR_RESULTS];
static int sk_fds[REUSEPORT_ARRAY_SIZE];
static int reuseport_array, outer_map;
static int select_by_skb_data_prog;
@ -610,7 +610,19 @@ static void setup_per_test(int type, unsigned short family, bool inany)
static void cleanup_per_test(void)
{
int i, err;
int i, err, zero = 0;
memset(expected_results, 0, sizeof(expected_results));
for (i = 0; i < NR_RESULTS; i++) {
err = bpf_map_update_elem(result_map, &i, &zero, BPF_ANY);
RET_IF(err, "reset elem in result_map",
"i:%u err:%d errno:%d\n", i, err, errno);
}
err = bpf_map_update_elem(linum_map, &zero, &zero, BPF_ANY);
RET_IF(err, "reset line number in linum_map", "err:%d errno:%d\n",
err, errno);
for (i = 0; i < REUSEPORT_ARRAY_SIZE; i++)
close(sk_fds[i]);