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authorAlexei Starovoitov <ast@kernel.org>2021-05-14 03:36:18 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2021-05-19 01:40:56 +0300
commit7723256bf2443d6bd7db3e583953d14107955233 (patch)
treeb650411ac6e6ac55547b4816a96955a4759b29b1 /tools/lib
parent30f51aedabda92b74927979b2b3b50169e285f6b (diff)
downloadlinux-7723256bf2443d6bd7db3e583953d14107955233.tar.xz
libbpf: Introduce bpf_map__initial_value().
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
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/libbpf.c8
-rw-r--r--tools/lib/bpf/libbpf.h1
-rw-r--r--tools/lib/bpf/libbpf.map1
3 files changed, 10 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index a8a6bb30a45b..dc4d5fe6d9d2 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -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;
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 46b31c1f4849..d98523558f39 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -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);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index bc59516a8ccf..2abef6f17c06 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -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;