selftests: mptcp: use KSFT_SKIP/KSFT_PASS/KSFT_FAIL

This patch uses the public var KSFT_SKIP in mptcp_lib.sh instead of
ksft_skip, and drop 'ksft_skip=4' in mptcp_join.sh.

Use KSFT_PASS and KSFT_FAIL macros instead of 0 and 1 after 'exit '
and 'ret=' in all scripts:

exit 0 -> exit ${KSFT_PASS}
exit 1 -> exit ${KSFT_FAIL}
ret=0 -> ret=${KSFT_PASS}
ret=1 -> ret=${KSFT_FAIL}

Signed-off-by: Geliang Tang <[e-mail]>
Reviewed-by: Matthieu Baerts (NGI0) <[e-mail]>
Signed-off-by: Matthieu Baerts (NGI0) <[e-mail]>
Link: https://lore.kernel.org/r/20240308-upstream-[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/net/mptcp/mptcp_connect.sh

···
 	case "$option" in
 	"h")
 		usage $0
-		exit 0
+		exit ${KSFT_PASS}
 		;;
 	"d")
 		if [ $OPTARG -ge 0 ];then
 			tc_delay="$OPTARG"
 		else
 			echo "-d requires numeric argument, got \"$OPTARG\"" 1>&2
-			exit 1
+			exit ${KSFT_FAIL}
 		fi
 		;;
 	"e")
···
 			sndbuf="$OPTARG"
 		else
 			echo "-S requires numeric argument, got \"$OPTARG\"" 1>&2
-			exit 1
+			exit ${KSFT_FAIL}
 		fi
 		;;
 	"R")
···
 			rcvbuf="$OPTARG"
 		else
 			echo "-R requires numeric argument, got \"$OPTARG\"" 1>&2
-			exit 1
+			exit ${KSFT_FAIL}
 		fi
 		;;
 	"m")
···
 		;;
 	"?")
 		usage $0
-		exit 1
+		exit ${KSFT_FAIL}
 		;;
 	esac
 done
···
 	if [ "$(ip netns exec ${disabled_ns} sysctl net.mptcp.enabled | awk '{ print $3 }')" -ne 1 ]; then
 		mptcp_lib_pr_fail "net.mptcp.enabled sysctl is not 1 by default"
 		mptcp_lib_result_fail "net.mptcp.enabled sysctl is not 1 by default"
-		ret=1
+		ret=${KSFT_FAIL}
 		return 1
 	fi
 	ip netns exec ${disabled_ns} sysctl -q net.mptcp.enabled=0
···
 	if [ ${err} -eq 0 ]; then
 		mptcp_lib_pr_fail "New MPTCP socket cannot be blocked via sysctl"
 		mptcp_lib_result_fail "New MPTCP socket cannot be blocked via sysctl"
-		ret=1
+		ret=${KSFT_FAIL}
 		return 1
 	fi
 
···
 
 	if [ $rc -ne 0 ] ; then
 		mptcp_lib_pr_fail "$listener_ns -> $connect_addr connectivity"
-		ret=1
+		ret=${KSFT_FAIL}
 
 		return 1
 	fi
···
 		mptcp_lib_pr_fail "${msg}"
 
 		final_ret=${ret}
-		ret=0
+		ret=${KSFT_PASS}
 
 		return ${final_ret}
 	fi

tools/testing/selftests/net/mptcp/mptcp_join.sh

···
 capout=""
 ns1=""
 ns2=""
-ksft_skip=4
 iptables="iptables"
 ip6tables="ip6tables"
 timeout_poll=30
···
 		-p tcp \
 		-m length --length 150:9999 \
 		-m statistic --mode nth --packet 1 --every 99999 \
-		-j MARK --set-mark 42 || return ${ksft_skip}
+		-j MARK --set-mark 42 || return ${KSFT_SKIP}
 
-	tc -n $ns2 qdisc add dev ns2eth$i clsact || return ${ksft_skip}
+	tc -n $ns2 qdisc add dev ns2eth$i clsact || return ${KSFT_SKIP}
 	tc -n $ns2 filter add dev ns2eth$i egress \
 		protocol ip prio 1000 \
 		handle 42 fw \
 		action pedit munge offset 148 u8 invert \
 		pipe csum tcp \
-		index 100 || return ${ksft_skip}
+		index 100 || return ${KSFT_SKIP}
 }
 
 reset_with_fail()
···
 	local rc=0
 	setup_fail_rules "${@}" || rc=$?
 
-	if [ ${rc} -eq ${ksft_skip} ]; then
+	if [ ${rc} -eq ${KSFT_SKIP} ]; then
 		mark_as_skipped "unable to set the 'fail' rules"
 		return 1
 	fi
···
 # $1: err msg
 fail_test()
 {
-	ret=1
+	ret=${KSFT_FAIL}
 
 	if [ ${#} -gt 0 ]; then
 		print_fail "${@}"
···
 {
 	if [ -n "${1}" ]; then
 		echo "${1}"
-		ret=1
+		ret=${KSFT_FAIL}
 	fi
 
 	echo "mptcp_join usage:"

tools/testing/selftests/net/mptcp/mptcp_sockopt.sh

···
 		if [ $v -ne 0 ]; then
 			mptcp_lib_pr_fail "got $tables $values in ns $ns," \
 					  "not 0 - not all expected packets marked"
-			ret=1
+			ret=${KSFT_FAIL}
 			return 1
 		fi
 	done
···
 
 		mptcp_lib_result_fail "transfer ${ip}"
 
-		ret=1
+		ret=${KSFT_FAIL}
 		return 1
 	fi
 	if ! mptcp_lib_check_transfer $cin $sout "file received by server"; then

tools/testing/selftests/net/mptcp/pm_netlink.sh

···
 	case "$option" in
 	"h")
 		usage $0
-		exit 0
+		exit ${KSFT_PASS}
 		;;
 	"?")
 		usage $0
-		exit 1
+		exit ${KSFT_FAIL}
 		;;
 	esac
 done
···
 	mptcp_lib_check_output "${err}" "${cmd}" "${expected}" || rc=${?}
 	if [ ${rc} -eq 2 ]; then
 		mptcp_lib_result_fail "${msg} # error ${rc}"
-		ret=1
+		ret=${KSFT_FAIL}
 	elif [ ${rc} -eq 0 ]; then
 		mptcp_lib_print_ok "[ OK ]"
 		mptcp_lib_result_pass "${msg}"
 	elif [ ${rc} -eq 1 ]; then
 		mptcp_lib_result_fail "${msg} # different output"
-		ret=1
+		ret=${KSFT_FAIL}
 	fi
 }
 

tools/testing/selftests/net/mptcp/simult_flows.sh

···
 	case "$option" in
 	"h")
 		usage $0
-		exit 0
+		exit ${KSFT_PASS}
 		;;
 	"b")
 		bail=1
···
 		;;
 	"?")
 		usage $0
-		exit 1
+		exit ${KSFT_FAIL}
 		;;
 	esac
 done

tools/testing/selftests/net/mptcp/userspace_pm.sh

···
 	then
 		mptcp_lib_pr_fail "${@}"
 	fi
-	ret=1
+	ret=${KSFT_FAIL}
 	mptcp_lib_result_fail "${test_name}"
 }
 
···
 	else
 		test_fail "Expected tokens (c:${client_token} - s:${server_token}) and server (c:${client_serverside} - s:${server_serverside})"
 		mptcp_lib_result_print_all_tap
-		exit 1
+		exit ${KSFT_FAIL}
 	fi
 
 	if [ "$is_v6" = "v6" ]