selftests: net: return Kselftest Skip code for skipped tests

When net test is skipped because of unmet dependencies and/or unsupported
configuration, it returns 0 which is treated as a pass by the Kselftest
framework. This leads to false positive result even when the test could
not be run.

Change it to return kselftest skip code when a test gets skipped to
clearly report that the test could not be run.

Kselftest framework SKIP code is 4 and the framework prints appropriate
messages to indicate that the test is skipped.

Change psock_tpacket to use ksft_exit_skip() when a non-root user runs
the test and add an explicit check for root and a clear message, instead
of failing the test when /sys/power/state file open fails.

Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/net/fib_tests.sh

@@ -5,6 +5,8 @@
 # different events.
 
 ret=0
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
 
 VERBOSE=${VERBOSE:=0}
 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
@@ -579,18 +581,18 @@ fib_test()
 
 if [ "$(id -u)" -ne 0 ];then
 	echo "SKIP: Need root privileges"
-	exit 0
+	exit $ksft_skip;
 fi
 
 if [ ! -x "$(command -v ip)" ]; then
 	echo "SKIP: Could not run test without ip tool"
-	exit 0
+	exit $ksft_skip
 fi
 
 ip route help 2>&1 | grep -q fibmatch
 if [ $? -ne 0 ]; then
 	echo "SKIP: iproute2 too old, missing fibmatch"
-	exit 0
+	exit $ksft_skip
 fi
 
 # start clean

tools/testing/selftests/net/netdevice.sh

@@ -8,6 +8,9 @@
 # if not they probably have failed earlier in the boot process and their logged error will be catched by another test
 #
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 # this function will try to up the interface
 # if already up, nothing done
 # arg1: network interface name
@@ -18,7 +21,7 @@ kci_net_start()
 	ip link show "$netdev" |grep -q UP
 	if [ $? -eq 0 ];then
 		echo "SKIP: $netdev: interface already up"
-		return 0
+		return $ksft_skip
 	fi
 
 	ip link set "$netdev" up
@@ -61,12 +64,12 @@ kci_net_setup()
 	ip address show "$netdev" |grep '^[[:space:]]*inet'
 	if [ $? -eq 0 ];then
 		echo "SKIP: $netdev: already have an IP"
-		return 0
+		return $ksft_skip
 	fi
 
 	# TODO what ipaddr to set ? DHCP ?
 	echo "SKIP: $netdev: set IP address"
-	return 0
+	return $ksft_skip
 }
 
 # test an ethtool command
@@ -84,6 +87,7 @@ kci_netdev_ethtool_test()
 	if [ $ret -ne 0 ];then
 		if [ $ret -eq "$1" ];then
 			echo "SKIP: $netdev: ethtool $2 not supported"
+			return $ksft_skip
 		else
 			echo "FAIL: $netdev: ethtool $2"
 			return 1
@@ -104,7 +108,7 @@ kci_netdev_ethtool()
 	ethtool --version 2>/dev/null >/dev/null
 	if [ $? -ne 0 ];then
 		echo "SKIP: ethtool not present"
-		return 1
+		return $ksft_skip
 	fi
 
 	TMP_ETHTOOL_FEATURES="$(mktemp)"
@@ -176,13 +180,13 @@ kci_test_netdev()
 #check for needed privileges
 if [ "$(id -u)" -ne 0 ];then
 	echo "SKIP: Need root privileges"
-	exit 0
+	exit $ksft_skip
 fi
 
 ip link show 2>/dev/null >/dev/null
 if [ $? -ne 0 ];then
 	echo "SKIP: Could not run test without the ip tool"
-	exit 0
+	exit $ksft_skip
 fi
 
 TMP_LIST_NETDEV="$(mktemp)"

tools/testing/selftests/net/pmtu.sh

@@ -43,6 +43,9 @@
 #	that MTU is properly calculated instead when MTU is not configured from
 #	userspace
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 tests="
 	pmtu_vti6_exception		vti6: PMTU exceptions
 	pmtu_vti4_exception		vti4: PMTU exceptions
@@ -162,7 +165,7 @@ setup_xfrm6() {
 }
 
 setup() {
-	[ "$(id -u)" -ne 0 ] && echo "  need to run as root" && return 1
+	[ "$(id -u)" -ne 0 ] && echo "  need to run as root" && return $ksft_skip
 
 	cleanup_done=0
 	for arg do

tools/testing/selftests/net/psock_tpacket.c

@@ -60,6 +60,8 @@
 
 #include "psock_lib.h"
 
+#include "../kselftest.h"
+
 #ifndef bug_on
 # define bug_on(cond)		assert(!(cond))
 #endif
@@ -825,7 +827,7 @@ static int test_tpacket(int version, int type)
 		fprintf(stderr, "test: skip %s %s since user and kernel "
 			"space have different bit width\n",
 			tpacket_str[version], type_str[type]);
-		return 0;
+		return KSFT_SKIP;
 	}
 
 	sock = pfsocket(version);

tools/testing/selftests/net/rtnetlink.sh

@@ -7,6 +7,9 @@
 devdummy="test-dummy0"
 ret=0
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 # set global exit status, but never reset nonzero one.
 check_err()
 {
@@ -333,7 +336,7 @@ kci_test_vrf()
 	ip link show type vrf 2>/dev/null
 	if [ $? -ne 0 ]; then
 		echo "SKIP: vrf: iproute2 too old"
-		return 0
+		return $ksft_skip
 	fi
 
 	ip link add "$vrfname" type vrf table 10
@@ -409,7 +412,7 @@ kci_test_encap_fou()
 	ip fou help 2>&1 |grep -q 'Usage: ip fou'
 	if [ $? -ne 0 ];then
 		echo "SKIP: fou: iproute2 too old"
-		return 1
+		return $ksft_skip
 	fi
 
 	ip netns exec "$testns" ip fou add port 7777 ipproto 47 2>/dev/null
@@ -444,7 +447,7 @@ kci_test_encap()
 	ip netns add "$testns"
 	if [ $? -ne 0 ]; then
 		echo "SKIP encap tests: cannot add net namespace $testns"
-		return 1
+		return $ksft_skip
 	fi
 
 	ip netns exec "$testns" ip link set lo up
@@ -469,7 +472,7 @@ kci_test_macsec()
 	ip macsec help 2>&1 | grep -q "^Usage: ip macsec"
 	if [ $? -ne 0 ]; then
 		echo "SKIP: macsec: iproute2 too old"
-		return 0
+		return $ksft_skip
 	fi
 
 	ip link add link "$devdummy" "$msname" type macsec port 42 encrypt on
@@ -511,14 +514,14 @@ kci_test_gretap()
 	ip netns add "$testns"
 	if [ $? -ne 0 ]; then
 		echo "SKIP gretap tests: cannot add net namespace $testns"
-		return 1
+		return $ksft_skip
 	fi
 
 	ip link help gretap 2>&1 | grep -q "^Usage:"
 	if [ $? -ne 0 ];then
 		echo "SKIP: gretap: iproute2 too old"
 		ip netns del "$testns"
-		return 1
+		return $ksft_skip
 	fi
 
 	# test native tunnel
@@ -561,14 +564,14 @@ kci_test_ip6gretap()
 	ip netns add "$testns"
 	if [ $? -ne 0 ]; then
 		echo "SKIP ip6gretap tests: cannot add net namespace $testns"
-		return 1
+		return $ksft_skip
 	fi
 
 	ip link help ip6gretap 2>&1 | grep -q "^Usage:"
 	if [ $? -ne 0 ];then
 		echo "SKIP: ip6gretap: iproute2 too old"
 		ip netns del "$testns"
-		return 1
+		return $ksft_skip
 	fi
 
 	# test native tunnel
@@ -611,13 +614,13 @@ kci_test_erspan()
 	ip link help erspan 2>&1 | grep -q "^Usage:"
 	if [ $? -ne 0 ];then
 		echo "SKIP: erspan: iproute2 too old"
-		return 1
+		return $ksft_skip
 	fi
 
 	ip netns add "$testns"
 	if [ $? -ne 0 ]; then
 		echo "SKIP erspan tests: cannot add net namespace $testns"
-		return 1
+		return $ksft_skip
 	fi
 
 	# test native tunnel erspan v1
@@ -676,13 +679,13 @@ kci_test_ip6erspan()
 	ip link help ip6erspan 2>&1 | grep -q "^Usage:"
 	if [ $? -ne 0 ];then
 		echo "SKIP: ip6erspan: iproute2 too old"
-		return 1
+		return $ksft_skip
 	fi
 
 	ip netns add "$testns"
 	if [ $? -ne 0 ]; then
 		echo "SKIP ip6erspan tests: cannot add net namespace $testns"
-		return 1
+		return $ksft_skip
 	fi
 
 	# test native tunnel ip6erspan v1
@@ -762,14 +765,14 @@ kci_test_rtnl()
 #check for needed privileges
 if [ "$(id -u)" -ne 0 ];then
 	echo "SKIP: Need root privileges"
-	exit 0
+	exit $ksft_skip
 fi
 
 for x in ip tc;do
 	$x -Version 2>/dev/null >/dev/null
 	if [ $? -ne 0 ];then
 		echo "SKIP: Could not run test without the $x tool"
-		exit 0
+		exit $ksft_skip
 	fi
 done