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libbpf: add bpf_btf_get_next_id() to cycle through BTF objects

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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>
This commit is contained in:
Quentin Monnet
2019-08-20 10:31:53 +01:00
committed by yonghong-song
parent 66d20edaf0
commit 9084f4cd4d
3 changed files with 8 additions and 0 deletions
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5
src/bpf.c
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@@ -593,6 +593,11 @@ int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_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) int bpf_prog_get_fd_by_id(__u32 id)
{ {
union bpf_attr attr; union bpf_attr attr;

1
src/bpf.h
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@@ -156,6 +156,7 @@ LIBBPF_API int bpf_prog_test_run(int prog_fd, int repeat, void *data,
__u32 *retval, __u32 *duration); __u32 *retval, __u32 *duration);
LIBBPF_API int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id); 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_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_prog_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_map_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); LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);

2
src/libbpf.map
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@@ -186,4 +186,6 @@ LIBBPF_0.0.4 {
} LIBBPF_0.0.3; } LIBBPF_0.0.3;
LIBBPF_0.0.5 { LIBBPF_0.0.5 {
global:
bpf_btf_get_next_id;
} LIBBPF_0.0.4; } LIBBPF_0.0.4;