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libbpf: Introduce btf__find_by_name_kind() 

Introduce btf__find_by_name_kind() helper to search BTF by name and kind, since
name alone can be ambiguous.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191114185720.1641606-6-ast@kernel.org
This commit is contained in:
Alexei Starovoitov 2019-11-14 10:57:05 -08:00 committed by Daniel Borkmann
parent fec56f5890
commit 1442e2871b
3 changed files with 25 additions and 0 deletions
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22
tools/lib/bpf/btf.c
View File

@ -316,6 +316,28 @@ __s32 btf__find_by_name(const struct btf *btf, const char *type_name)
return -ENOENT;
}
__s32 btf__find_by_name_kind(const struct btf *btf, const char *type_name,
__u32 kind)
{
__u32 i;
if (kind == BTF_KIND_UNKN || !strcmp(type_name, "void"))
return 0;
for (i = 1; i <= btf->nr_types; i++) {
const struct btf_type *t = btf->types[i];
const char *name;
if (btf_kind(t) != kind)
continue;
name = btf__name_by_offset(btf, t->name_off);
if (name && !strcmp(type_name, name))
return i;
}
return -ENOENT;
}
void btf__free(struct btf *btf)
{
if (!btf)

2
tools/lib/bpf/btf.h
View File

@ -72,6 +72,8 @@ LIBBPF_API int btf__finalize_data(struct bpf_object *obj, struct btf *btf);
LIBBPF_API int btf__load(struct btf *btf);
LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
const char *type_name);
LIBBPF_API __s32 btf__find_by_name_kind(const struct btf *btf,
const char *type_name, __u32 kind);
LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf);
LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
__u32 id);

1
tools/lib/bpf/libbpf.map
View File

@ -204,4 +204,5 @@ LIBBPF_0.0.6 {
bpf_program__is_tracing;
bpf_program__set_tracing;
bpf_program__size;
btf__find_by_name_kind;
} LIBBPF_0.0.5;