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libbpf: Add bpf_map__inner_map API

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The API gives access to inner map for map in map types (array or
hash of map). It will be used to dynamically set max_entries in it.

Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210408061310.95877-7-yauheni.kaliuta@redhat.com
This commit is contained in:
Andrii Nakryiko 2021-04-08 09:13:08 +03:00 committed by Andrii Nakryiko
parent 23a6576606
commit b3278099b2
3 changed files with 12 additions and 0 deletions
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10
tools/lib/bpf/libbpf.c
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@ -2194,6 +2194,7 @@ static int parse_btf_map_def(struct bpf_object *obj,
map->inner_map = calloc(1, sizeof(*map->inner_map));
if (!map->inner_map)
return -ENOMEM;
map->inner_map->fd = -1;
map->inner_map->sec_idx = obj->efile.btf_maps_shndx;
map->inner_map->name = malloc(strlen(map->name) +
sizeof(".inner") + 1);
@ -3845,6 +3846,14 @@ __u32 bpf_map__max_entries(const struct bpf_map *map)
return map->def.max_entries;
}
struct bpf_map *bpf_map__inner_map(struct bpf_map *map)
{
if (!bpf_map_type__is_map_in_map(map->def.type))
return NULL;
return map->inner_map;
}
int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries)
{
if (map->fd >= 0)
@ -9476,6 +9485,7 @@ int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd)
pr_warn("error: inner_map_fd already specified\n");
return -EINVAL;
}
zfree(&map->inner_map);
map->inner_map_fd = fd;
return 0;
}

1
tools/lib/bpf/libbpf.h
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@ -480,6 +480,7 @@ LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);
LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);
LIBBPF_API struct bpf_map *bpf_map__inner_map(struct bpf_map *map);
LIBBPF_API long libbpf_get_error(const void *ptr);

1
tools/lib/bpf/libbpf.map
View File

@ -359,5 +359,6 @@ LIBBPF_0.4.0 {
bpf_linker__finalize;
bpf_linker__free;
bpf_linker__new;
bpf_map__inner_map;
bpf_object__set_kversion;
} LIBBPF_0.3.0;