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Currently, bpf_prog_info includes 9 arrays. The user has the option to fetch any combination of these arrays. However, this requires a lot of handling. This work becomes more tricky when we need to store bpf_prog_info to a file, because these arrays are allocated independently. This patch introduces 'struct bpf_prog_info_linear', which stores arrays of bpf_prog_info in continuous memory. Helper functions are introduced to unify the work to get different sets of bpf_prog_info. Specifically, bpf_program__get_prog_info_linear() allows the user to select which arrays to fetch, and handles details for the user. Please see the comments right before 'enum bpf_prog_info_array' for more details and examples. Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lkml.kernel.org/r/ce92c091-e80d-a0c1-4aa0-987706c42b20@iogearbox.net Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: kernel-team@fb.com Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Link: http://lkml.kernel.org/r/20190312053051.2690567-3-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This is a mirror of bpf-next linux tree (https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next) bpf-next/tools/lib/bpf directory plus its supporting header files. The following files will by sync'ed with bpf-next repo: src/ <-> bpf-next/tools/lib/bpf/ include/uapi/linux/bpf_common.h <-> bpf-next/tools/include/uapi/linux/bpf_common.h include/uapi/linux/bpf.h <-> bpf-next/tools/include/uapi/linux/bpf.h include/uapi/linux/btf.h <-> bpf-next/tools/include/uapi/linux/btf.h include/uapi/linux/if_link.h <-> bpf-next/tools/include/uapi/linux/if_link.h include/uapi/linux/if_xdp.h <-> bpf-next/tools/include/uapi/linux/if_xdp.h include/uapi/linux/netlink.h <-> bpf-next/tools/include/uapi/linux/netlink.h include/tools/libc_compat.h <-> bpf-next/tools/include/tools/libc_compat.h Other header files at this repo (include/linux/*.h) are reduced versions of their counterpart files at bpf-next/tools/include/linux/*.h to make compilation successful. Build ===== To build static library libbpf.a: cd src make To build both static libbpf.a and shared libbpf.so libraries in directory build/ and install them together with libbpf headers in a staging directory root/: cd src mkdir build root BUILD_SHARED=y OBJDIR=build DESTDIR=root make install