AF_XDP Rx and overload

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When an AF_XDP based application is overloaded, it is preferable for
the application to:
* Service the Rx ring as fast as it can and drop in the application if
required?
* Let the Rx ring fill up and let the NIC drop?

This is mostly a performance/PPS question. Obviously the application
loses the ability to directly count the drops if the NIC drops among
other limitations.

If it makes a difference, the use case is only i40e right now.




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