From: Andrii Nakryiko <andrii@kernel.org>
Date: Wed, 2 Dec 2020 06:52:42 +0000 (-0800)
Subject: libbpf: Add base BTF accessor
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0cfdcd6378071f383c900e3d8862347e2af1d1ca;p=linux.git

libbpf: Add base BTF accessor

Add ability to get base BTF. It can be also used to check if BTF is split BTF.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201202065244.530571-3-andrii@kernel.org
---

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 8ff46cd30ca15..1935e83d309c4 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -432,6 +432,11 @@ __u32 btf__get_nr_types(const struct btf *btf)
 	return btf->start_id + btf->nr_types - 1;
 }
 
+const struct btf *btf__base_btf(const struct btf *btf)
+{
+	return btf->base_btf;
+}
+
 /* internal helper returning non-const pointer to a type */
 static struct btf_type *btf_type_by_id(struct btf *btf, __u32 type_id)
 {
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 1093f6fe6800d..1237bcd1dd17e 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -51,6 +51,7 @@ LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
 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 *btf__base_btf(const struct btf *btf);
 LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
 						  __u32 id);
 LIBBPF_API size_t btf__pointer_size(const struct btf *btf);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 29ff4807b9094..ed55498c41220 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -340,6 +340,7 @@ LIBBPF_0.2.0 {
 
 LIBBPF_0.3.0 {
 	global:
+		btf__base_btf;
 		btf__parse_elf_split;
 		btf__parse_raw_split;
 		btf__parse_split;