diff mbox series

[bpf-next,v3,2/5] libbpf: set btf_value_type_id of struct bpf_map for struct_ops.

Message ID 20240221012329.1387275-3-thinker.li@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Create shadow types for struct_ops maps in skeletons | expand

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netdev/series_format success Posting correctly formatted
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netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/build_tools success Errors and warnings before: 1 this patch: 1
netdev/cc_maintainers warning 8 maintainers not CCed: jolsa@kernel.org daniel@iogearbox.net john.fastabend@gmail.com yonghong.song@linux.dev sdf@google.com eddyz87@gmail.com kpsingh@kernel.org haoluo@google.com
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Commit Message

Kui-Feng Lee Feb. 21, 2024, 1:23 a.m. UTC 
From: Kui-Feng Lee <thinker.li@gmail.com>

For a struct_ops map, btf_value_type_id is the type ID of it's struct
type. This value is required by bpftool to generate skeleton including
pointers of shadow types. The code generator gets the type ID from
bpf_map__btf_vaule_type_id() in order to get the type information of the
struct type of a map.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 tools/lib/bpf/libbpf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index ef8fd20f33ca..465b50235a01 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1229,6 +1229,7 @@  static int init_struct_ops_maps(struct bpf_object *obj, const char *sec_name,
 		map->name = strdup(var_name);
 		if (!map->name)
 			return -ENOMEM;
+		map->btf_value_type_id = type_id;
 
 		map->def.type = BPF_MAP_TYPE_STRUCT_OPS;
 		map->def.key_size = sizeof(int);
@@ -4818,7 +4819,9 @@  static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b
 	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;
+		create_attr.btf_value_type_id =
+			def->type != BPF_MAP_TYPE_STRUCT_OPS ?
+			map->btf_value_type_id : 0;
 	}
 
 	if (bpf_map_type__is_map_in_map(def->type)) {