selftests: forwarding: Only check tc version for tc tests

Capabilities of tc command are irrelevant for router tests:
$ ./router.sh
SKIP: iproute2 too old, missing shared block support

Add a CHECK_TC flag and only check tc capabilities if set. Add flag to
tc_common.sh and have it sourced before lib.sh

Also, if the command lacks some feature the test should exit non-0.

Signed-off-by: David Ahern <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

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

···
 # SPDX-License-Identifier: GPL-2.0
 
 NUM_NETIFS=4
+CHECK_TC="yes"
 source lib.sh
 
 h1_create()

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

···
 ##############################################################################
 # Sanity checks
 
+check_tc_version()
+{
+	tc -j &> /dev/null
+	if [[ $? -ne 0 ]]; then
+		echo "SKIP: iproute2 too old; tc is missing JSON support"
+		exit 1
+	fi
+
+	tc filter help 2>&1 | grep block &> /dev/null
+	if [[ $? -ne 0 ]]; then
+		echo "SKIP: iproute2 too old; tc is missing shared block support"
+		exit 1
+	fi
+}
+
 if [[ "$(id -u)" -ne 0 ]]; then
 	echo "SKIP: need root privileges"
 	exit 0
 fi
 
-tc -j &> /dev/null
-if [[ $? -ne 0 ]]; then
-	echo "SKIP: iproute2 too old, missing JSON support"
-	exit 0
-fi
-
-tc filter help 2>&1 | grep block &> /dev/null
-if [[ $? -ne 0 ]]; then
-	echo "SKIP: iproute2 too old, missing shared block support"
-	exit 0
+if [[ "$CHECK_TC" = "yes" ]]; then
+	check_tc_version
 fi
 
 if [[ ! -x "$(command -v jq)" ]]; then
 	echo "SKIP: jq not installed"
-	exit 0
+	exit 1
 fi
 
 if [[ ! -x "$(command -v $MZ)" ]]; then

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

···
 # SPDX-License-Identifier: GPL-2.0
 
 NUM_NETIFS=4
-source lib.sh
 source tc_common.sh
+source lib.sh
 
 tcflags="skip_hw"
 

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

···
 # SPDX-License-Identifier: GPL-2.0
 
 NUM_NETIFS=2
-source lib.sh
 source tc_common.sh
+source lib.sh
 
 tcflags="skip_hw"
 

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

···
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+CHECK_TC="yes"
+
 tc_check_packets()
 {
 	local id=$1

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

···
 # SPDX-License-Identifier: GPL-2.0
 
 NUM_NETIFS=2
-source lib.sh
 source tc_common.sh
+source lib.sh
 
 tcflags="skip_hw"
 

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

···
 # SPDX-License-Identifier: GPL-2.0
 
 NUM_NETIFS=4
-source lib.sh
 source tc_common.sh
+source lib.sh
 
 tcflags="skip_hw"