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d84ced9730
Program fails on newer kernels, with error message:
libbpf: Netlink-based XDP prog detected, please unload it in order to launch AF_XDP prog
ERROR: Can't setup AF_XDP socket "Invalid argument"
Since kernel v5.13 libbpf version, when bpf_link support is
detected then libbpf/xsk require XDP/BPF programs use this feature.
See kernel commit 10397994d30f ("libbpf: xsk: Use bpf_link").
To continue using our netlink-based XDP attach approach,
instruct libbpf/xsk to not be in change of loading the
BPF-prog. As our XDP-prog is special it also makes
to control this ourselves.
This is achived with the flag XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD
xsk_cfg.libbpf_flags = XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD
Remember to update the xskmap manually.
Fixes: 10397994d30f ("libbpf: xsk: Use bpf_link")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Practical BPF examples
This git repository contains a diverse set of practical BPF examples that solve (or demonstrate) a specific use-case using BPF.
It is meant to ease doing rapid prototyping and development, writing C-code BPF programs using libbpf. The goal is to make is easier for developers to get started coding.
Many developers struggle to get a working BPF build environment. The repo enviroment makes it easy to build/compile BPF programs by doing the necessary libbpf setup transparently and detect missing compile dependencies (via the (configure)[configure] script). It is a declared goal to make BPF programming more consumable by detecting and reporting issues (when possible).