selftests/bpf: Add drv mode testing for xdping

As subject, we only test SKB mode for xdping at present.
Now add DRV mode for xdping.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220602032507.464453-1-liuhangbin@gmail.com

tools/testing/selftests/bpf/test_xdping.sh

@@ -95,5 +95,9 @@ for server_args in "" "-I veth0 -s -S" ; do
 	test "$client_args" "$server_args"
 done
 
+# Test drv mode
+test "-I veth1 -N" "-I veth0 -s -N"
+test "-I veth1 -N -c 10" "-I veth0 -s -N"
+
 echo "OK. All tests passed"
 exit 0