Šabić: eBPF and XDP for Processing Packets at Bare-metal Speed

Nedim Šabić has written a
tutorial article on using the eXpress Data Path for fast packet
filtering. 'Now comes the most relevant part of our XDP program that
deals with packet’s processing logic. XDP ships with a predefined set of
verdicts that determine how the kernel diverts the packet flow. For
instance, we can pass the packet to the regular network stack, drop it,
redirect the packet to another NIC and such. In our case, XDP_DROP yields
an ultra-fast packet drop.'