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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
This commit is contained in:
Andrii Nakryiko
2021-03-18 12:40:26 -07:00
committed by Alexei Starovoitov
parent e14ef4bf01
commit f36e99a45d
2 changed files with 230 additions and 174 deletions
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7
tools/lib/bpf/libbpf_internal.h
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@@ -356,4 +356,11 @@ struct bpf_core_relo {
enum bpf_core_relo_kind kind;
};
typedef int (*type_id_visit_fn)(__u32 *type_id, void *ctx);
typedef int (*str_off_visit_fn)(__u32 *str_off, void *ctx);
int btf_type_visit_type_ids(struct btf_type *t, type_id_visit_fn visit, void *ctx);
int btf_type_visit_str_offs(struct btf_type *t, str_off_visit_fn visit, void *ctx);
int btf_ext_visit_type_ids(struct btf_ext *btf_ext, type_id_visit_fn visit, void *ctx);
int btf_ext_visit_str_offs(struct btf_ext *btf_ext, str_off_visit_fn visit, void *ctx);
#endif /* __LIBBPF_LIBBPF_INTERNAL_H */