On Fri, 23 Oct 2020 11:38:50 +0800 Hangbin Liu <haliu@xxxxxxxxxx> wrote: > This series converts iproute2 to use libbpf for loading and attaching > BPF programs when it is available. This means that iproute2 will > correctly process BTF information and support the new-style BTF-defined > maps, while keeping compatibility with the old internal map definition > syntax. > > This is achieved by checking for libbpf at './configure' time, and using > it if available. By default the system libbpf will be used, but static > linking against a custom libbpf version can be achieved by passing > LIBBPF_DIR to configure. FORCE_LIBBPF can be set to force configure to > abort if no suitable libbpf is found (useful for automatic packaging > that wants to enforce the dependency). > > The old iproute2 bpf code is kept and will be used if no suitable libbpf > is available. When using libbpf, wrapper code ensures that iproute2 will > still understand the old map definition format, including populating > map-in-map and tail call maps before load. > > The examples in bpf/examples are kept, and a separate set of examples > are added with BTF-based map definitions for those examples where this > is possible (libbpf doesn't currently support declaratively populating > tail call maps). Luca wants to put this in Debian 11 (good idea), but that means: 1. It has to work with 5.10 release and kernel. 2. Someone has to test it. 3. The 5.10 is a LTS kernel release which means BPF developers have to agree to supporting LTS releases. If someone steps up to doing this then I would be happy to merge it now for 5.10. Otherwise it won't show up until 5.11.
