libbpf: Generalize BTF and BTF.ext type ID and strings iteration

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Extract and generalize the logic to iterate BTF type ID and string offset
fields within BTF types and .BTF.ext data. Expose this internally in libbpf
for re-use by bpf_linker.

Additionally, complete strings deduplication handling for BTF.ext (e.g., CO-RE
access strings), which was previously missing. There previously was no
case of deduplicating .BTF.ext data, but bpf_linker is going to use it.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210318194036.3521577-3-andrii@kernel.org

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Andrii Nakryiko 2021-03-18 12:40:26 -07:00 • committed by Alexei Starovoitov

parent e14ef4bf01

commit f36e99a45d

2 changed files with 228 additions and 172 deletions

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397

tools/lib/bpf/btf.c

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7

tools/lib/bpf/libbpf_internal.h

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