Thanks a lot for your suggestions,
Taking them into account and having a look a this example on userdata field
usage (http://dpdk.org/doc/api/examples_2bbdev_app_2main_8c-example.html#a19),
I have though the following plan. I think that the most elegant way to do
it is to use "userdata" for metada
Thanks for your quick answer,
I have read so many documents and web pages on this issue that probably I
confounded the utility of the headroom. It is good to know that this 128
bytes space is available to my disposal. The fact of being lost once the
NIC transmits the frame it is not a problem at a
