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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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5
src/libbpf_internal.h
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@@ -361,8 +361,11 @@ enum kern_feature_id {
__FEAT_CNT,
};
int probe_memcg_account(void);
struct kern_feature_cache;
bool feat_supported(struct kern_feature_cache *cache, enum kern_feature_id feat_id);
bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id);
int probe_memcg_account(void);
int bump_rlimit_memlock(void);
int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz);