• Daniel Borkmann's avatar
    bpf: decouple btf from seq bpf fs dump and enable more maps · e8d2bec0
    Daniel Borkmann authored
    Commit a26ca7c9 ("bpf: btf: Add pretty print support to
    the basic arraymap") and 699c86d6 ("bpf: btf: add pretty
    print for hash/lru_hash maps") enabled support for BTF and
    dumping via BPF fs for array and hash/lru map. However, both
    can be decoupled from each other such that regular BPF maps
    can be supported for attaching BTF key/value information,
    while not all maps necessarily need to dump via map_seq_show_elem()
    callback.
    
    The basic sanity check which is a prerequisite for all maps
    is that key/value size has to match in any case, and some maps
    can have extra checks via map_check_btf() callback, e.g.
    probing certain types or indicating no support in general. With
    that we can also enable retrieving BTF info for per-cpu map
    types and lpm.
    Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
    Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
    Acked-by: default avatarYonghong Song <yhs@fb.com>
    e8d2bec0
syscall.c 55.3 KB