From: Daniel Borkmann Date: Wed, 8 Jul 2020 22:44:46 +0000 (+0200) Subject: Merge branch 'bpf-libbpf-old-kernel' X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2977282b63c3b6f112145ecf0bcefff0c65bd3ac;p=linux.git Merge branch 'bpf-libbpf-old-kernel' Andrii Nakryiko says: ==================== This patch set improves libbpf's support of old kernels, missing features like BTF support, global variables support, etc. Most critical one is a silent drop of CO-RE relocations if libbpf fails to load BTF (despite sanitization efforts). This is frequently the case for kernels that have no BTF support whatsoever. There are still useful BPF applications that could work on such kernels and do rely on CO-RE. To that end, this series revamps the way BTF is handled in libbpf. Failure to load BTF into kernel doesn't prevent libbpf from using BTF in its full capability (e.g., for CO-RE relocations) internally. Another issue that was identified was reliance of perf_buffer__new() on BPF_OBJ_GET_INFO_BY_FD command, which is more recent that perf_buffer support itself. Furthermore, BPF_OBJ_GET_INFO_BY_FD is needed just for some sanity checks to provide better user errors, so could be safely omitted if kernel doesn't provide it. Perf_buffer selftest was adjusted to use skeleton, instead of bpf_prog_load(). The latter uses BPF_F_TEST_RND_HI32 flag, which is a relatively recent addition and unnecessary fails selftest in libbpf's Travis CI tests. By using skeleton we both get a shorter selftest and it work on pretty ancient kernels, giving better libbpf test coverage. One new selftest was added that relies on basic CO-RE features, but otherwise doesn't expect any recent features (like global variables) from kernel. Again, it's good to have better coverage of old kernels in libbpf testing. ==================== Signed-off-by: Daniel Borkmann --- 2977282b63c3b6f112145ecf0bcefff0c65bd3ac