From c93cc69004df340d71a9ab3433b8e5c9fd1fca7a Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Thu, 25 Apr 2019 15:30:08 -0700 Subject: bpftool: add ability to dump BTF types Add new `btf dump` sub-command to bpftool. It allows to dump human-readable low-level BTF types representation of BTF types. BTF can be retrieved from few different sources: - from BTF object by ID; - from PROG, if it has associated BTF; - from MAP, if it has associated BTF data; it's possible to narrow down types to either key type, value type, both, or all BTF types; - from ELF file (.BTF section). Output format mostly follows BPF verifier log format with few notable exceptions: - all the type/field/param/etc names are enclosed in single quotes to allow easier grepping and to stand out a little bit more; - FUNC_PROTO output follows STRUCT/UNION/ENUM format of having one line per each argument; this is more uniform and allows easy grepping, as opposed to succinct, but inconvenient format that BPF verifier log is using. Cc: Daniel Borkmann Cc: Alexei Starovoitov Cc: Yonghong Song Cc: Martin KaFai Lau Cc: Song Liu Cc: Arnaldo Carvalho de Melo Acked-by: Yonghong Song Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov --- tools/bpf/bpftool/main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'tools/bpf/bpftool/main.c') diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c index a9d5e9e6a732..1ac1fc520e6a 100644 --- a/tools/bpf/bpftool/main.c +++ b/tools/bpf/bpftool/main.c @@ -56,7 +56,7 @@ static int do_help(int argc, char **argv) " %s batch file FILE\n" " %s version\n" "\n" - " OBJECT := { prog | map | cgroup | perf | net | feature }\n" + " OBJECT := { prog | map | cgroup | perf | net | feature | btf }\n" " " HELP_SPEC_OPTIONS "\n" "", bin_name, bin_name, bin_name); @@ -188,6 +188,7 @@ static const struct cmd cmds[] = { { "perf", do_perf }, { "net", do_net }, { "feature", do_feature }, + { "btf", do_btf }, { "version", do_version }, { 0 } }; -- cgit v1.2.3-55-g7522