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libbpf: Init btf_{key,value}_type_id on internal map open

Browse source 
For internal and user maps, look up the key and value btf
types on open() and not load(), so that `bpf_map_btf_value_type_id`
is usable in `bpftool gen`.

Signed-off-by: Delyan Kratunov <delyank@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/78dbe4e457b4a05e098fc6c8f50014b680c86e4e.1647473511.git.delyank@fb.com
This commit is contained in:
Delyan Kratunov 2022-03-16 23:37:30 +00:00 committed by Andrii Nakryiko
parent bc380eb9d0
commit 262cfb74ff
1 changed files with 14 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
tools/lib/bpf/libbpf.c
View file

@ -1517,6 +1517,9 @@ static char *internal_map_name(struct bpf_object *obj, const char *real_name)
return strdup(map_name);
}
static int
bpf_map_find_btf_info(struct bpf_object *obj, struct bpf_map *map);
static int
bpf_object__init_internal_map(struct bpf_object *obj, enum libbpf_map_type type,
const char *real_name, int sec_idx, void *data, size_t data_sz)
@ -1564,6 +1567,9 @@ bpf_object__init_internal_map(struct bpf_object *obj, enum libbpf_map_type type,
return err;
}
/* failures are fine because of maps like .rodata.str1.1 */
(void) bpf_map_find_btf_info(obj, map);
if (data)
memcpy(map->mmaped, data, data_sz);
@ -2046,6 +2052,9 @@ static int bpf_object__init_user_maps(struct bpf_object *obj, bool strict)
}
memcpy(&map->def, def, sizeof(struct bpf_map_def));
}
/* btf info may not exist but fill it in if it does exist */
(void) bpf_map_find_btf_info(obj, map);
}
return 0;
}
@ -2534,6 +2543,10 @@ static int bpf_object__init_user_btf_map(struct bpf_object *obj,
fill_map_from_def(map->inner_map, &inner_def);
}
err = bpf_map_find_btf_info(obj, map);
if (err)
return err;
return 0;
}
@ -4873,7 +4886,7 @@ static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b
if (bpf_map__is_struct_ops(map))
create_attr.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id;
if (obj->btf && btf__fd(obj->btf) >= 0 && !bpf_map_find_btf_info(obj, map)) {
if (obj->btf && btf__fd(obj->btf) >= 0) {
create_attr.btf_fd = btf__fd(obj->btf);
create_attr.btf_key_type_id = map->btf_key_type_id;
create_attr.btf_value_type_id = map->btf_value_type_id;