From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B8E0A15A864; Mon, 27 May 2024 14:19:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716819555; cv=none; b=TQzlKzHZUbYmcvyz6i1Nb+YYb6/T1gj71uYOyQTuai4afIbcBLska83SlNn7Mwd9DnmhbDuUQxd981Gc+QMNGlbP8bMeTdmLOPpSB9yPJPPhwD5fEOsAan6BwfzFNyyQqKbawrTXJBhRFtrpUQ38Z8EOFy98aVt0wYcJaKcwXdQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716819555; c=relaxed/simple; bh=egnv+4LYG9kf+MAFhOdp1ZtsU4oJCToVCs7HH+OYNpM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=CryFlQd4Gr7Cn5kcbc/ZS+5U3tAMEP3VMWqNHJZ/sFXo6aaAxIwIJg1MO/VyUe16T1NDZctwyFjmO52PYd/43TJuYkhMc7FIp9Ou0qCdxz+4SmPJZKHluIGy4gtaNXehRh3cV5dwfU/oC5gwAeW+ie2kJHZp8fAwwTmtvw/82Tg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OL50qa14; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OL50qa14" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30DD4C2BBFC; Mon, 27 May 2024 14:19:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716819555; bh=egnv+4LYG9kf+MAFhOdp1ZtsU4oJCToVCs7HH+OYNpM=; h=From:To:Cc:Subject:Date:From; b=OL50qa14jD5ELMb+9YhlvKLL8fCfjswo2MK8mY5N4MAEzrX9W3xJjUfogIUl3GRpu SgQjFIk7RrzXFMuYhYx65CahDK0/UNVJhckTMqBVxhJKZtmSqGSrD/8FlsLXhgXqpj 0svsQlqSz6yqD8EwqocSQBlwtwxKEfpFMOGioup/TW5rTsrWPSYMiVecoJgdIUVui8 1ugdlndI0pyXHEGXnaebxW/6md3RfeeA4rRUOoY8c8DzUe6EyR7Ygj274He5JtjJxe j6k7S8FvDXm6dVr47lTGHNx5AXX6xWYgMY/7EP3067coUc6V5NxASPPekDpbaDkiyO aZzszCB8dp9Pw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "Alessandro Carminati (Red Hat)" , Andrii Nakryiko , Sasha Levin , ast@kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, shuah@kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 01/13] selftests/bpf: Prevent client connect before server bind in test_tc_tunnel.sh Date: Mon, 27 May 2024 10:18:38 -0400 Message-ID: <20240527141901.3854691-1-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.10.218 Content-Transfer-Encoding: 8bit From: "Alessandro Carminati (Red Hat)" [ Upstream commit f803bcf9208a2540acb4c32bdc3616673169f490 ] In some systems, the netcat server can incur in delay to start listening. When this happens, the test can randomly fail in various points. This is an example error message: # ip gre none gso # encap 192.168.1.1 to 192.168.1.2, type gre, mac none len 2000 # test basic connectivity # Ncat: Connection refused. The issue stems from a race condition between the netcat client and server. The test author had addressed this problem by implementing a sleep, which I have removed in this patch. This patch introduces a function capable of sleeping for up to two seconds. However, it can terminate the waiting period early if the port is reported to be listening. Signed-off-by: Alessandro Carminati (Red Hat) Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20240314105911.213411-1-alessandro.carminati@gmail.com Signed-off-by: Sasha Levin --- tools/testing/selftests/bpf/test_tc_tunnel.sh | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/test_tc_tunnel.sh b/tools/testing/selftests/bpf/test_tc_tunnel.sh index 7c76b841b17bb..21bde60c95230 100755 --- a/tools/testing/selftests/bpf/test_tc_tunnel.sh +++ b/tools/testing/selftests/bpf/test_tc_tunnel.sh @@ -71,7 +71,6 @@ cleanup() { server_listen() { ip netns exec "${ns2}" nc "${netcat_opt}" -l -p "${port}" > "${outfile}" & server_pid=$! - sleep 0.2 } client_connect() { @@ -92,6 +91,16 @@ verify_data() { fi } +wait_for_port() { + for i in $(seq 20); do + if ip netns exec "${ns2}" ss ${2:--4}OHntl | grep -q "$1"; then + return 0 + fi + sleep 0.1 + done + return 1 +} + set -e # no arguments: automated test, run all @@ -183,6 +192,7 @@ setup # basic communication works echo "test basic connectivity" server_listen +wait_for_port ${port} ${netcat_opt} client_connect verify_data @@ -194,6 +204,7 @@ ip netns exec "${ns1}" tc filter add dev veth1 egress \ section "encap_${tuntype}_${mac}" echo "test bpf encap without decap (expect failure)" server_listen +wait_for_port ${port} ${netcat_opt} ! client_connect if [[ "$tuntype" =~ "udp" ]]; then -- 2.43.0