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libbpf: Add BPF object skeleton support

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Add new set of APIs, allowing to open/load/attach BPF object through BPF
object skeleton, generated by bpftool for a specific BPF object file. All the
xxx_skeleton() APIs wrap up corresponding bpf_object_xxx() APIs, but
additionally also automate map/program lookups by name, global data
initialization and mmap()-ing, etc.  All this greatly improves and simplifies
userspace usability of working with BPF programs. See follow up patches for
examples.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191214014341.3442258-13-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-12-13 17:43:36 -08:00
committed by Alexei Starovoitov
parent 3f51935314
commit d66562fba1
3 changed files with 205 additions and 0 deletions
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5
tools/lib/bpf/libbpf.map
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@@ -213,6 +213,11 @@ LIBBPF_0.0.7 {
global:
btf_dump__emit_type_decl;
bpf_object__find_program_by_name;
bpf_object__attach_skeleton;
bpf_object__destroy_skeleton;
bpf_object__detach_skeleton;
bpf_object__load_skeleton;
bpf_object__open_skeleton;
bpf_program__attach;
bpf_program__name;
btf__align_of;