On 2 Apr 2019, at 0:46, William Tu wrote:
The patch series introduces AF_XDP support for OVS netdev. AF_XDP is a new address family working together with eBPF. In short, a socket with AF_XDP family can receive and send packets from an eBPF/XDP program attached to the netdev. For more details about AF_XDP, please see linux kernel's Documentation/networking/af_xdp.rst OVS has a couple of netdev types, i.e., system, tap, or internal. The patch first adds a new netdev types called "afxdp", and implement its configuration, packet reception, and transmit functions. Since the AF_XDP socket, xsk, operates in userspace, once ovs-vswitchd receives packets from xsk, the proposed architecture re-uses the existing userspace dpif-netdev datapath. As a result, most of the packet processing happens at the userspace instead of linux kernel.
One other issue I found it that if a XDP program is already attached, due to crash or previous loaded one, adding the port will hang.
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