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 <[e-mail]>
Signed-off-by: Andrii Nakryiko <[e-mail]>
Acked-by: Song Liu <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

tools/testing/selftests/bpf/test_xdping.sh

···
 	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