@@ -214,6 +214,7 @@ struct bpf_map {
int fd;
char *name;
size_t offset;
+ bool fd_preset;
int map_ifindex;
struct bpf_map_def def;
uint32_t btf_key_type_id;
@@ -1081,6 +1082,34 @@ static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
return 0;
}
+int bpf_map__reuse_fd(struct bpf_map *map, int fd)
+{
+ struct bpf_map_info info = {};
+ __u32 len = sizeof(info);
+ int err;
+
+ err = bpf_obj_get_info_by_fd(fd, &info, &len);
+ if (err)
+ return err;
+
+ map->fd = dup(fd);
+ if (map->fd < 0)
+ return map->fd;
+ map->fd_preset = true;
+
+ free(map->name);
+ map->name = strdup(info.name);
+ map->def.type = info.type;
+ map->def.key_size = info.key_size;
+ map->def.value_size = info.value_size;
+ map->def.max_entries = info.max_entries;
+ map->def.map_flags = info.map_flags;
+ map->btf_key_type_id = info.btf_key_type_id;
+ map->btf_value_type_id = info.btf_value_type_id;
+
+ return 0;
+}
+
static int
bpf_object__create_maps(struct bpf_object *obj)
{
@@ -1093,6 +1122,12 @@ bpf_object__create_maps(struct bpf_object *obj)
struct bpf_map_def *def = &map->def;
int *pfd = &map->fd;
+ if (map->fd_preset) {
+ pr_debug("skip map create (preset) %s: fd=%d\n",
+ map->name, map->fd);
+ continue;
+ }
+
create_attr.name = map->name;
create_attr.map_ifindex = map->map_ifindex;
create_attr.map_type = def->type;
@@ -261,6 +261,7 @@ typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
int bpf_map__set_priv(struct bpf_map *map, void *priv,
bpf_map_clear_priv_t clear_priv);
void *bpf_map__priv(struct bpf_map *map);
+int bpf_map__reuse_fd(struct bpf_map *map, int fd);
bool bpf_map__is_offload_neutral(struct bpf_map *map);
void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
int bpf_map__pin(struct bpf_map *map, const char *path);