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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Lorenz Bauer <lmb@cloudflare.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jakub Sitnicki <jakub@cloudflare.com>,
	Martin KaFai Lau <kafai@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 397/459] selftests: bpf: Reset global state between reuseport test runs
Date: Fri, 14 Feb 2020 11:00:47 -0500
Message-ID: <20200214160149.11681-397-sashal@kernel.org> (raw)
In-Reply-To: <20200214160149.11681-1-sashal@kernel.org>

From: Lorenz Bauer <lmb@cloudflare.com>

[ 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: 91134d849a0e ("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>
---
 .../selftests/bpf/test_select_reuseport.c        | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_select_reuseport.c b/tools/testing/selftests/bpf/test_select_reuseport.c
index 7566c13eb51a7..079d0f5a29091 100644
--- a/tools/testing/selftests/bpf/test_select_reuseport.c
+++ b/tools/testing/selftests/bpf/test_select_reuseport.c
@@ -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;
@@ -662,7 +662,19 @@ 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]);
-- 
2.20.1


  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214160149.11681-1-sashal@kernel.org>
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 071/459] kselftest: Minimise dependency of get_size on C library interfaces Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 099/459] selftests: settings: tests can be in subsubdirs Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 183/459] selftests/net: make so_txtime more robust to timer variance Sasha Levin
2020-02-14 16:00 ` Sasha Levin [this message]
2020-02-14 16:00 ` [PATCH AUTOSEL 5.4 401/459] selftests/eeh: Bump EEH wait time to 60s Sasha Levin

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