Add support for driver/native mode (iovisor#3574)

Add support for driver/native mode in example xdp_drop_count.py.

examples/networking/xdp/xdp_drop_count.py

@@ -16,6 +16,7 @@
 def usage():
  print("Usage: {0} [-S] <ifdev>".format(sys.argv[0]))
  print(" -S: use skb mode\n")
+ print(" -D: use driver mode\n")
  print(" -H: use hardware offload mode\n")
  print("e.g.: {0} eth0\n".format(sys.argv[0]))
  exit(1)
@@ -34,6 +35,9 @@ def usage():
  if "-S" in sys.argv:
  # XDP_FLAGS_SKB_MODE
  flags |= BPF.XDP_FLAGS_SKB_MODE
+ if "-D" in sys.argv:
+ # XDP_FLAGS_DRV_MODE
+ flags |= BPF.XDP_FLAGS_DRV_MODE
  if "-H" in sys.argv:
  # XDP_FLAGS_HW_MODE
  maptype = "array"