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libbpf: Introduce bpf_map__initial_value().

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Introduce bpf_map__initial_value() to read initial contents
of mmaped data/rodata/bss maps.
Note that bpf_map__set_initial_value() doesn't allow modifying
kconfig map while bpf_map__initial_value() allows reading
its values.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-17-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-05-13 17:36:18 -07:00 committed by Daniel Borkmann
parent 30f51aedab
commit 7723256bf2
3 changed files with 10 additions and 0 deletions
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8
tools/lib/bpf/libbpf.c
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@ -9755,6 +9755,14 @@ int bpf_map__set_initial_value(struct bpf_map *map,
return 0;
}
const void *bpf_map__initial_value(struct bpf_map *map, size_t *psize)
{
if (!map->mmaped)
return NULL;
*psize = map->def.value_size;
return map->mmaped;
}
bool bpf_map__is_offload_neutral(const struct bpf_map *map)
{
return map->def.type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;

1
tools/lib/bpf/libbpf.h
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@ -471,6 +471,7 @@ LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv,
LIBBPF_API void *bpf_map__priv(const struct bpf_map *map);
LIBBPF_API int bpf_map__set_initial_value(struct bpf_map *map,
const void *data, size_t size);
LIBBPF_API const void *bpf_map__initial_value(struct bpf_map *map, size_t *psize);
LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map);
LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map);
LIBBPF_API int bpf_map__set_pin_path(struct bpf_map *map, const char *path);

1
tools/lib/bpf/libbpf.map
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@ -359,6 +359,7 @@ LIBBPF_0.4.0 {
bpf_linker__finalize;
bpf_linker__free;
bpf_linker__new;
bpf_map__initial_value;
bpf_map__inner_map;
bpf_object__gen_loader;
bpf_object__set_kversion;