Also with liburing you have zero-copy send and receive operations for normal protocols like UDP or TCP, but this requires a NIC that supports scatter/gather DMA

Also with liburing you have zero-copy send and receive operations for normal protocols like UDP or TCP, but this requires a NIC that supports scatter/gather DMA (so that the packet headers go to/from kernel buffers, while the data goes to/from userland buffers). AF_XDP is also available in older kernels, but with recent enough kernels (zero-copy receive is a recent addition) and with a good NIC, liburing should provide a similar performance.