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Message-Id: <20230717-upstream-net-next-20230712-selftests-mptcp-subtests-v1-6-695127e0ad83@tessares.net>
Date:   Mon, 17 Jul 2023 15:21:26 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: [PATCH net-next 06/13] selftests: mptcp: lib: format subtests
 results in TAP

The current selftests infrastructure formats the results in TAP 13. This
version doesn't support subtests and only the end result of each
selftest is taken into account. It means that a single issue in a
subtest of a selftest containing multiple subtests forces the whole
selftest to be marked as failed. It also means that subtests results are
not tracked by CIs executing selftests.

MPTCP selftests run hundreds of various subtests. It is then important
to track each of them and not one result per selftest.

It is particularly interesting to do that when validating stable kernels
with the last version of the test suite: tests might fail because a
feature is not supported but the test didn't skip that part. In this
case, if subtests are not tracked, the whole selftest will be marked as
failed making the other subtests useless because their results are
ignored.

This patch adds some helpers in mptcp_lib.sh to be able to easily format
subtests results in TAP in the different MPTCP selftests.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/368
Acked-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
---
 tools/testing/selftests/net/mptcp/mptcp_lib.sh | 66 ++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_lib.sh b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
index f32045b23b89..b1a0fdd0408b 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_lib.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
@@ -1,8 +1,12 @@
 #! /bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+readonly KSFT_PASS=0
 readonly KSFT_FAIL=1
 readonly KSFT_SKIP=4
+readonly KSFT_TEST=$(basename "${0}" | sed 's/\.sh$//g')
+
+MPTCP_LIB_SUBTESTS=()
 
 # SELFTESTS_MPTCP_LIB_EXPECT_ALL_FEATURES env var can be set when validating all
 # features using the last version of the kernel and the selftests to make sure
@@ -102,3 +106,65 @@ mptcp_lib_kversion_ge() {
 
 	mptcp_lib_fail_if_expected_feature "kernel version ${1} lower than ${v}"
 }
+
+__mptcp_lib_result_add() {
+	local result="${1}"
+	shift
+
+	local id=$((${#MPTCP_LIB_SUBTESTS[@]} + 1))
+
+	MPTCP_LIB_SUBTESTS+=("${result} ${id} - ${KSFT_TEST}: ${*}")
+}
+
+# $1: test name
+mptcp_lib_result_pass() {
+	__mptcp_lib_result_add "ok" "${1}"
+}
+
+# $1: test name
+mptcp_lib_result_fail() {
+	__mptcp_lib_result_add "not ok" "${1}"
+}
+
+# $1: test name
+mptcp_lib_result_skip() {
+	__mptcp_lib_result_add "ok" "${1} # SKIP"
+}
+
+# $1: result code ; $2: test name
+mptcp_lib_result_code() {
+	local ret="${1}"
+	local name="${2}"
+
+	case "${ret}" in
+		"${KSFT_PASS}")
+			mptcp_lib_result_pass "${name}"
+			;;
+		"${KSFT_FAIL}")
+			mptcp_lib_result_fail "${name}"
+			;;
+		"${KSFT_SKIP}")
+			mptcp_lib_result_skip "${name}"
+			;;
+		*)
+			echo "ERROR: wrong result code: ${ret}"
+			exit ${KSFT_FAIL}
+			;;
+	esac
+}
+
+mptcp_lib_result_print_all_tap() {
+	local subtest
+
+	if [ ${#MPTCP_LIB_SUBTESTS[@]} -eq 0 ] ||
+	   [ "${SELFTESTS_MPTCP_LIB_NO_TAP:-}" = "1" ]; then
+		return
+	fi
+
+	printf "\nTAP version 13\n"
+	printf "1..%d\n" "${#MPTCP_LIB_SUBTESTS[@]}"
+
+	for subtest in "${MPTCP_LIB_SUBTESTS[@]}"; do
+		printf "%s\n" "${subtest}"
+	done
+}

-- 
2.40.1

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