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libbpf: Further decouple feature checking logic from bpf_object

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Add feat_supported() helper that accepts feature cache instead of
bpf_object. This allows low-level code in bpf.c to not know or care
about higher-level concept of bpf_object, yet it will be able to utilize
custom feature checking in cases where BPF token might influence the
outcome.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240124022127.2379740-23-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2024-01-23 18:21:19 -08:00
committed by Andrii Nakryiko
parent 9454419946
commit 9bf95048b7
3 changed files with 22 additions and 11 deletions
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22
src/libbpf.c
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@@ -5033,17 +5033,14 @@ static struct kern_feature_desc {
},
};
bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id)
bool feat_supported(struct kern_feature_cache *cache, enum kern_feature_id feat_id)
{
struct kern_feature_desc *feat = &feature_probes[feat_id];
struct kern_feature_cache *cache = &feature_cache;
int ret;
if (obj && obj->gen_loader)
/* To generate loader program assume the latest kernel
* to avoid doing extra prog_load, map_create syscalls.
*/
return true;
/* assume global feature cache, unless custom one is provided */
if (!cache)
cache = &feature_cache;
if (READ_ONCE(cache->res[feat_id]) == FEAT_UNKNOWN) {
ret = feat->probe();
@@ -5060,6 +5057,17 @@ bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id)
return READ_ONCE(cache->res[feat_id]) == FEAT_SUPPORTED;
}
bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id)
{
if (obj && obj->gen_loader)
/* To generate loader program assume the latest kernel
* to avoid doing extra prog_load, map_create syscalls.
*/
return true;
return feat_supported(NULL, feat_id);
}
static bool map_is_reuse_compat(const struct bpf_map *map, int map_fd)
{
struct bpf_map_info map_info;