Hi all, I'm playing with AF_XDP with a program based on the sample one in the xdp-tutorial repo. The program is a simple UDP echo server, and works fine on any interface _but_ the loopback one! When I run it on lo, I can: * receive packets * send the responses * see the UDP packets I'm sending from AF_xDP in tcpdump but the actual application does not receive any traffic. I also tried the original example in xdp-tutorial (which replies to ICMP echo requests rather than UDP packets) and I can observe the same behaviour. I'm using: * xdp-tutorial from master * Ubuntu 19.10 * kernel 5.3.0 Is this a known issue? Does lo require any special configuration to work with AF_XDP? Cheers, Gilberto
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