selftests: xsk: cleanup veth pair at ctrl-c

Remove the veth pair when the tests are aborted by pressing
ctrl-c. Currently in this situation, the veth pair is left on the
system polluting the netdev space.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/r/20220510115604.8717-7-magnus.karlsson@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/test_xsk.sh

@@ -97,6 +97,13 @@ NS0=root
 NS1=af_xdp${VETH1_POSTFIX}
 MTU=1500
 
+trap ctrl_c INT
+
+function ctrl_c() {
+        cleanup_exit ${VETH0} ${VETH1} ${NS1}
+	exit 1
+}
+
 setup_vethPairs() {
 	if [[ $verbose -eq 1 ]]; then
 	        echo "setting up ${VETH0}: namespace: ${NS0}"