From: Quentin Monnet <quentin.monnet@netronome.com>
Date: Tue, 20 Aug 2019 10:31:53 +0100
Subject: libbpf: add bpf_btf_get_next_id() to cycle through BTF objects
Patch-mainline: v5.4-rc1
Git-commit: 09d7c2e32b6e06d58fe7a5aa38847f4719ab4cc7
References: bsc#1154353
Add an API function taking a BTF object id and providing the id of the
next BTF object in the kernel. This can be used to list all BTF objects
loaded on the system.
v2:
- Rebase on top of Andrii's changes regarding libbpf versioning.
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
tools/lib/bpf/bpf.c | 5 +++++
tools/lib/bpf/bpf.h | 1 +
tools/lib/bpf/libbpf.map | 2 ++
3 files changed, 8 insertions(+)
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -593,6 +593,11 @@ int bpf_map_get_next_id(__u32 start_id,
return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID);
}
+int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)
+{
+ return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);
+}
+
int bpf_prog_get_fd_by_id(__u32 id)
{
union bpf_attr attr;
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -156,6 +156,7 @@ LIBBPF_API int bpf_prog_test_run(int pro
__u32 *retval, __u32 *duration);
LIBBPF_API int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id);
LIBBPF_API int bpf_map_get_next_id(__u32 start_id, __u32 *next_id);
+LIBBPF_API int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id);
LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -186,4 +186,6 @@ LIBBPF_0.0.4 {
} LIBBPF_0.0.3;
LIBBPF_0.0.5 {
+ global:
+ bpf_btf_get_next_id;
} LIBBPF_0.0.4;