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8732c4f813
Using the XDP ingress hook requires a newer kernel (needs Toke's patch fixing the verification of global function for BPF_PROG_TYPE_EXT programs) than tc mode, is will likely perform worse than tc if running in generic mode (due to no driver support for XDP). Furthermore, even when XDP works and has driver support, its performance benefit over tc is likely small as the packets are always passed on to the network stack regardless (not creating a fast-path that bypasses the network stack). Therefore, use the tc ingress hook as default instead, and only use XDP if explicitly required by the user (-I/--ingress hook xdp). This partly addresses issue #49, as ePPing should no longer by default get the confusing error message from failing verification if the kernel lacks Toke's verifier patch. Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
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 it 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 script). It is a declared goal to make BPF programming more consumable by detecting and reporting issues (when possible).