selftests/net: Use kselftest skip code for skipped tests

There are several test cases in the net directory are still using
exit 0 or exit 1 when they need to be skipped. Use kselftest
framework skip code instead so it can help us to distinguish the
return status.

Criterion to filter out what should be fixed in net directory:
  grep -r "exit [01]" -B1 | grep -i skip

This change might cause some false-positives if people are running
these test scripts directly and only checking their return codes,
which will change from 0 to 4. However I think the impact should be
small as most of our scripts here are already using this skip code.
And there will be no such issue if running them with the kselftest
framework.

Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20210823085854.40216-1-po-hsu.lin@canonical.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/fcnal-test.sh

@@ -37,6 +37,9 @@
 #
 # server / client nomenclature relative to ns-A
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 VERBOSE=0
 
 NSA_DEV=eth1
@@ -3974,7 +3977,7 @@ fi
 which nettest >/dev/null
 if [ $? -ne 0 ]; then
 	echo "'nettest' command not found; skipping tests"
-	exit 0
+	exit $ksft_skip
 fi
 
 declare -i nfail=0

tools/testing/selftests/net/fib_rule_tests.sh

@@ -3,6 +3,9 @@
 
 # This test is for checking IPv4 and IPv6 FIB rules API
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 ret=0
 
 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
@@ -238,12 +241,12 @@ run_fibrule_tests()
 
 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
 
 # start clean

tools/testing/selftests/net/forwarding/devlink_lib.sh

@@ -1,6 +1,9 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 ##############################################################################
 # Defines
 
@@ -9,11 +12,11 @@ if [[ ! -v DEVLINK_DEV ]]; then
 			     | jq -r '.port | keys[]' | cut -d/ -f-2)
 	if [ -z "$DEVLINK_DEV" ]; then
 		echo "SKIP: ${NETIFS[p1]} has no devlink device registered for it"
-		exit 1
+		exit $ksft_skip
 	fi
 	if [[ "$(echo $DEVLINK_DEV | grep -c pci)" -eq 0 ]]; then
 		echo "SKIP: devlink device's bus is not PCI"
-		exit 1
+		exit $ksft_skip
 	fi
 
 	DEVLINK_VIDDID=$(lspci -s $(echo $DEVLINK_DEV | cut -d"/" -f2) \
@@ -22,7 +25,7 @@ elif [[ ! -z "$DEVLINK_DEV" ]]; then
 	devlink dev show $DEVLINK_DEV &> /dev/null
 	if [ $? -ne 0 ]; then
 		echo "SKIP: devlink device \"$DEVLINK_DEV\" not found"
-		exit 1
+		exit $ksft_skip
 	fi
 fi
 
@@ -32,19 +35,19 @@ fi
 devlink help 2>&1 | grep resource &> /dev/null
 if [ $? -ne 0 ]; then
 	echo "SKIP: iproute2 too old, missing devlink resource support"
-	exit 1
+	exit $ksft_skip
 fi
 
 devlink help 2>&1 | grep trap &> /dev/null
 if [ $? -ne 0 ]; then
 	echo "SKIP: iproute2 too old, missing devlink trap support"
-	exit 1
+	exit $ksft_skip
 fi
 
 devlink dev help 2>&1 | grep info &> /dev/null
 if [ $? -ne 0 ]; then
 	echo "SKIP: iproute2 too old, missing devlink dev info support"
-	exit 1
+	exit $ksft_skip
 fi
 
 ##############################################################################

tools/testing/selftests/net/forwarding/lib.sh

@@ -4,6 +4,9 @@
 ##############################################################################
 # Defines
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 # Can be overridden by the configuration file.
 PING=${PING:=ping}
 PING6=${PING6:=ping6}
@@ -38,7 +41,7 @@ check_tc_version()
 	tc -j &> /dev/null
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: iproute2 too old; tc is missing JSON support"
-		exit 1
+		exit $ksft_skip
 	fi
 }
 
@@ -51,7 +54,7 @@ check_tc_mpls_support()
 		matchall action pipe &> /dev/null
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: iproute2 too old; tc is missing MPLS support"
-		return 1
+		return $ksft_skip
 	fi
 	tc filter del dev $dev ingress protocol mpls_uc pref 1 handle 1 \
 		matchall
@@ -69,7 +72,7 @@ check_tc_mpls_lse_stats()
 
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: iproute2 too old; tc-flower is missing extended MPLS support"
-		return 1
+		return $ksft_skip
 	fi
 
 	tc -j filter show dev $dev ingress protocol mpls_uc | jq . &> /dev/null
@@ -79,7 +82,7 @@ check_tc_mpls_lse_stats()
 
 	if [[ $ret -ne 0 ]]; then
 		echo "SKIP: iproute2 too old; tc-flower produces invalid json output for extended MPLS filters"
-		return 1
+		return $ksft_skip
 	fi
 }
 
@@ -88,7 +91,7 @@ check_tc_shblock_support()
 	tc filter help 2>&1 | grep block &> /dev/null
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: iproute2 too old; tc is missing shared block support"
-		exit 1
+		exit $ksft_skip
 	fi
 }
 
@@ -97,7 +100,7 @@ check_tc_chain_support()
 	tc help 2>&1|grep chain &> /dev/null
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: iproute2 too old; tc is missing chain support"
-		exit 1
+		exit $ksft_skip
 	fi
 }
 
@@ -106,7 +109,7 @@ check_tc_action_hw_stats_support()
 	tc actions help 2>&1 | grep -q hw_stats
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: iproute2 too old; tc is missing action hw_stats support"
-		exit 1
+		exit $ksft_skip
 	fi
 }
 
@@ -115,13 +118,13 @@ check_ethtool_lanes_support()
 	ethtool --help 2>&1| grep lanes &> /dev/null
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: ethtool too old; it is missing lanes support"
-		exit 1
+		exit $ksft_skip
 	fi
 }
 
 if [[ "$(id -u)" -ne 0 ]]; then
 	echo "SKIP: need root privileges"
-	exit 0
+	exit $ksft_skip
 fi
 
 if [[ "$CHECK_TC" = "yes" ]]; then
@@ -134,7 +137,7 @@ require_command()
 
 	if [[ ! -x "$(command -v "$cmd")" ]]; then
 		echo "SKIP: $cmd not installed"
-		exit 1
+		exit $ksft_skip
 	fi
 }
 
@@ -143,7 +146,7 @@ require_command $MZ
 
 if [[ ! -v NUM_NETIFS ]]; then
 	echo "SKIP: importer does not define \"NUM_NETIFS\""
-	exit 1
+	exit $ksft_skip
 fi
 
 ##############################################################################
@@ -203,7 +206,7 @@ for ((i = 1; i <= NUM_NETIFS; ++i)); do
 	ip link show dev ${NETIFS[p$i]} &> /dev/null
 	if [[ $? -ne 0 ]]; then
 		echo "SKIP: could not find all required interfaces"
-		exit 1
+		exit $ksft_skip
 	fi
 done
 

tools/testing/selftests/net/forwarding/router_mpath_nh.sh

@@ -411,7 +411,7 @@ ping_ipv6()
 ip nexthop ls >/dev/null 2>&1
 if [ $? -ne 0 ]; then
 	echo "Nexthop objects not supported; skipping tests"
-	exit 0
+	exit $ksft_skip
 fi
 
 trap cleanup EXIT

tools/testing/selftests/net/forwarding/router_mpath_nh_res.sh

@@ -386,7 +386,7 @@ ping_ipv6()
 ip nexthop ls >/dev/null 2>&1
 if [ $? -ne 0 ]; then
 	echo "Nexthop objects not supported; skipping tests"
-	exit 0
+	exit $ksft_skip
 fi
 
 trap cleanup EXIT

tools/testing/selftests/net/run_afpackettests

@@ -1,9 +1,12 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 if [ $(id -u) != 0 ]; then
 	echo $msg must be run as root >&2
-	exit 0
+	exit $ksft_skip
 fi
 
 ret=0

tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh

@@ -193,6 +193,9 @@
 # +---------------------------------------------------+
 #
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 readonly LOCALSID_TABLE_ID=90
 readonly IPv6_RT_NETWORK=fd00
 readonly IPv6_HS_NETWORK=cafe
@@ -543,18 +546,18 @@ host_vpn_isolation_tests()
 
 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
 
 modprobe vrf &>/dev/null
 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
         echo "SKIP: vrf sysctl does not exist"
-        exit 0
+        exit $ksft_skip
 fi
 
 cleanup &>/dev/null

tools/testing/selftests/net/srv6_end_dt4_l3vpn_test.sh

@@ -163,6 +163,9 @@
 # +---------------------------------------------------+
 #
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 readonly LOCALSID_TABLE_ID=90
 readonly IPv6_RT_NETWORK=fd00
 readonly IPv4_HS_NETWORK=10.0.0
@@ -464,18 +467,18 @@ host_vpn_isolation_tests()
 
 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
 
 modprobe vrf &>/dev/null
 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
         echo "SKIP: vrf sysctl does not exist"
-        exit 0
+        exit $ksft_skip
 fi
 
 cleanup &>/dev/null

tools/testing/selftests/net/srv6_end_dt6_l3vpn_test.sh

@@ -164,6 +164,9 @@
 # +---------------------------------------------------+
 #
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 readonly LOCALSID_TABLE_ID=90
 readonly IPv6_RT_NETWORK=fd00
 readonly IPv6_HS_NETWORK=cafe
@@ -472,18 +475,18 @@ host_vpn_isolation_tests()
 
 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
 
 modprobe vrf &>/dev/null
 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
         echo "SKIP: vrf sysctl does not exist"
-        exit 0
+        exit $ksft_skip
 fi
 
 cleanup &>/dev/null

tools/testing/selftests/net/unicast_extensions.sh

@@ -28,12 +28,15 @@
 # These tests provide an easy way to flip the expected result of any
 # of these behaviors for testing kernel patches that change them.
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 # nettest can be run from PATH or from same directory as this selftest
 if ! which nettest >/dev/null; then
 	PATH=$PWD:$PATH
 	if ! which nettest >/dev/null; then
 		echo "'nettest' command not found; skipping tests"
-		exit 0
+		exit $ksft_skip
 	fi
 fi
 

tools/testing/selftests/net/vrf_strict_mode_test.sh

@@ -3,6 +3,9 @@
 
 # This test is designed for testing the new VRF strict_mode functionality.
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 ret=0
 
 # identifies the "init" network namespace which is often called root network
@@ -371,18 +374,18 @@ vrf_strict_mode_check_support()
 
 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
 
 modprobe vrf &>/dev/null
 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
 	echo "SKIP: vrf sysctl does not exist"
-	exit 0
+	exit $ksft_skip
 fi
 
 cleanup &> /dev/null