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libbpf: Add subskeleton scaffolding

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In symmetry with bpf_object__open_skeleton(),
bpf_object__open_subskeleton() performs the actual walking and linking
of maps, progs, and globals described by bpf_*_skeleton objects.

Signed-off-by: Delyan Kratunov <delyank@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/6942a46fbe20e7ebf970affcca307ba616985b15.1647473511.git.delyank@fb.com
This commit is contained in:
Delyan Kratunov
2022-03-16 23:37:33 +00:00
committed by Andrii Nakryiko
parent e7084d4363
commit cc4ef17c78
3 changed files with 153 additions and 25 deletions
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29
src/libbpf.h
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@@ -1312,6 +1312,35 @@ LIBBPF_API int bpf_object__attach_skeleton(struct bpf_object_skeleton *s);
LIBBPF_API void bpf_object__detach_skeleton(struct bpf_object_skeleton *s);
LIBBPF_API void bpf_object__destroy_skeleton(struct bpf_object_skeleton *s);
struct bpf_var_skeleton {
const char *name;
struct bpf_map **map;
void **addr;
};
struct bpf_object_subskeleton {
size_t sz; /* size of this struct, for forward/backward compatibility */
const struct bpf_object *obj;
int map_cnt;
int map_skel_sz; /* sizeof(struct bpf_map_skeleton) */
struct bpf_map_skeleton *maps;
int prog_cnt;
int prog_skel_sz; /* sizeof(struct bpf_prog_skeleton) */
struct bpf_prog_skeleton *progs;
int var_cnt;
int var_skel_sz; /* sizeof(struct bpf_var_skeleton) */
struct bpf_var_skeleton *vars;
};
LIBBPF_API int
bpf_object__open_subskeleton(struct bpf_object_subskeleton *s);
LIBBPF_API void
bpf_object__destroy_subskeleton(struct bpf_object_subskeleton *s);
struct gen_loader_opts {
size_t sz; /* size of this struct, for forward/backward compatiblity */
const char *data;