io_uring is a new interface for asynchronous I/O to the Linux kernel. The LWN article and the io_uring design doc are both worth reading. I’ve been playing with AF_XDP a bit and after reading the io_uring doc it seemed like some of the io_uring ideas would be great enhancements to AF_XDP. Happily, one of the more interesting features, adding a wake-up flag to AF_XDP to avoid syscalls, was recently posted to Netdev.