Description of extension:
Currently in case of multiple vqueues in virtio-net the tun driver in the kernel is responsible for the receive steering. It maintains lookup table of TCPIP header hashes for transmitted packets, calculates hash for received packets and decides on RX queue to place the packet in. As now QEMU is aware of RSS settings of Windows quest, it can provide eBPF to tun driver to use it for faster decision of receive queue according to RSS settings.