[PATCH bpf-next 1/4] libbpf: expose map elf section name

[Delyan Kratunov <delyank@xxxxxx>]

When generating subskeletons, bpftool needs to know the elf section
name, as that's the stable identifier that will survive into the final
linked bpf_object.

This patch adds bpf_map__section_name in symmetry with
bpf_program__section_name.

Signed-off-by: Delyan Kratunov <delyank@xxxxxx>
---
 tools/lib/bpf/libbpf.c         | 8 ++++++++
 tools/lib/bpf/libbpf.h         | 2 ++
 tools/lib/bpf/libbpf.map       | 5 +++++
 tools/lib/bpf/libbpf_version.h | 2 +-
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index be6480e260c4..d20ae8f225ee 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9180,6 +9180,14 @@ const char *bpf_map__name(const struct bpf_map *map)
 	return map->name;
 }
 
+const char *bpf_map__section_name(const struct bpf_map *map)
+{
+	if (!map)
+		return NULL;
+
+	return map->real_name;
+}
+
 enum bpf_map_type bpf_map__type(const struct bpf_map *map)
 {
 	return map->def.type;
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index c8d8daad212e..7b66794f1c0a 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -741,6 +741,8 @@ LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 8, "use appropriate getters or setters ins
 const struct bpf_map_def *bpf_map__def(const struct bpf_map *map);
 /* get map name */
 LIBBPF_API const char *bpf_map__name(const struct bpf_map *map);
+/* get map ELF section name */
+LIBBPF_API const char *bpf_map__section_name(const struct bpf_map *map);
 /* get/set map type */
 LIBBPF_API enum bpf_map_type bpf_map__type(const struct bpf_map *map);
 LIBBPF_API int bpf_map__set_type(struct bpf_map *map, enum bpf_map_type type);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 47e70c9058d9..5c85d297d955 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -439,3 +439,8 @@ LIBBPF_0.7.0 {
 		libbpf_probe_bpf_prog_type;
 		libbpf_set_memlock_rlim_max;
 } LIBBPF_0.6.0;
+
+LIBBPF_0.8.0 {
+	global:
+    bpf_map__section_name;
+} LIBBPF_0.7.0;
diff --git a/tools/lib/bpf/libbpf_version.h b/tools/lib/bpf/libbpf_version.h
index 0fefefc3500b..61f2039404b6 100644
--- a/tools/lib/bpf/libbpf_version.h
+++ b/tools/lib/bpf/libbpf_version.h
@@ -4,6 +4,6 @@
 #define __LIBBPF_VERSION_H
 
 #define LIBBPF_MAJOR_VERSION 0
-#define LIBBPF_MINOR_VERSION 7
+#define LIBBPF_MINOR_VERSION 8
 
 #endif /* __LIBBPF_VERSION_H */
-- 
2.34.1