What is this? #

XDPBridge is an Ethernet bridge utilizing XDP, the Linux eXpress Data Path and its address family AF_XDP. As a Proof of Concept and performance testing tool it allows to explore the speed of raw Ethernet bridging with AF_XDP.

What is AF_XDP? #

AF_XDP is a raw socket optimized for high performance packet processing and allows zero-copy between kernel and applications. As the socket can be used for both receiving and transmitting, it supports high performance network applications purely in user space.

Further Information and Links #

• https://www.kernel.org/doc/html/latest/networking/af_xdp.html
• https://en.wikipedia.org/wiki/Express_Data_Path
• https://ebpf-docs.dylanreimerink.nl/linux/concepts/af_xdp/

Features #

During its operation XDPBridge collects various information using lockless atomic data structures and interactively provides the following statistics and counters:

• A source MAC address cumulative statistic with their total packet count.
• An Ethertype usage statistic.
• An overview of VLAN usage up to a nesting level of 4 (802.1q/0x8100 and QinQ 802.1ad/0x88a8).
• An OUI/vendor statistic with their observed packet counts (/24)

Availability #

XDPBridge is an internal R&D project.

Linux Distributions #

• RHEL 9
• Alma 9
• Rocky 9
• CentOS Stream 9
• Debian 12
• Ubuntu 24 LTS