User-space drivers have been doable for a while, and dpdk[1] is definitely worth a check. There's also some manufacturers[2] that only does user-space drivers f

User-space drivers have been doable for a while, and dpdk[1] is definitely worth a check. There's also some manufacturers[2] that only does user-space drivers for their high-performance cards (e.g. 4x10Gb/s, 2x40Gb/s, 2x100Gb/s cards). Being designed with this in mind helps performance a lot. 1: https://dpdk.org/ https://dpdk.org/ 2: http://www.napatech.com/ http://www.napatech.com/