selftests: net: Use XFAIL for operations not supported by the driver

Check if veth pair was created and if yes, xfail on setting IP address
logging an informational message.
Use XFAIL instead of SKIP for unsupported ethtool APIs.
Signed-off-by: Abhinav Jain <jain.abhinav177@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240821171903.118324-4-jain.abhinav177@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/netdevice.sh

@@ -67,8 +67,12 @@ kci_net_setup()
 		return $ksft_skip
 	fi
 
+	if [ "$veth_created" ]; then
+		echo "XFAIL: $netdev: set IP address unsupported for veth*"
+	else
 		# TODO what ipaddr to set ? DHCP ?
 		echo "SKIP: $netdev: set IP address"
+	fi
 	return $ksft_skip
 }
 
@@ -86,7 +90,7 @@ kci_netdev_ethtool_test()
 	ret=$?
 	if [ $ret -ne 0 ];then
 		if [ $ret -eq "$1" ];then
-			echo "SKIP: $netdev: ethtool $2 not supported"
+			echo "XFAIL: $netdev: ethtool $2 not supported"
 			return $ksft_skip
 		else
 			echo "FAIL: $netdev: ethtool $2"