Commit b23e97ff authored by Eduard Zingerman's avatar Eduard Zingerman Committed by Alexei Starovoitov
Browse files

bpf: add bpf_features enum 



This commit adds a kernel side enum for use in conjucntion with BTF
CO-RE bpf_core_enum_value_exists. The goal of the enum is to assist
with available BPF features detection. Intended usage looks as
follows:

  if (bpf_core_enum_value_exists(enum bpf_features, BPF_FEAT_<f>))
     ... use feature f ...

Signed-off-by: default avatarEduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250625182414.30659-2-eddyz87@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 0967f539

kernel/bpf/verifier.c

+6 −0
Original line number Diff line number Diff line
@@ -44,6 +44,10 @@ static const struct bpf_verifier_ops * const bpf_verifier_ops[] = { 
#undef BPF_LINK_TYPE

};









enum bpf_features {









	__MAX_BPF_FEAT,









};

















struct bpf_mem_alloc bpf_global_percpu_ma;









static bool bpf_global_percpu_ma_set;
















@@ -24439,6 +24443,8 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr, bpfptr_t uattr, __u3







	u32 log_true_size;









	bool is_priv;

















	BTF_TYPE_EMIT(enum bpf_features);

















	/* no program is valid */









	if (ARRAY_SIZE(bpf_verifier_ops) == 0)









		return -EINVAL;