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bpf: btf: Add BTF support to libbpf

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If the ".BTF" elf section exists, libbpf will try to create
a btf_fd (through BPF_BTF_LOAD).  If that fails, it will still
continue loading the bpf prog/map without the BTF.

If the bpf_object has a BTF loaded, it will create a map with the btf_fd.
libbpf will try to figure out the btf_key_id and btf_value_id of a map by
finding the BTF type with name "<map_name>_key" and "<map_name>_value".
If they cannot be found, it will continue without using the BTF.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Martin KaFai Lau 2018-04-18 15:56:05 -07:00 • committed by Daniel Borkmann
parent 3bd86a8409
commit 8a138aed4a
7 changed files with 627 additions and 32 deletions
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2
tools/lib/bpf/Build
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@ -1 +1 @@
libbpf-y := libbpf.o bpf.o nlattr.o
libbpf-y := libbpf.o bpf.o nlattr.o btf.o