From b23e97ffc25294025a68924b6feac9cd431c3eb5 Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Wed, 25 Jun 2025 11:24:12 -0700 Subject: [PATCH] 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_)) ... use feature f ... Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20250625182414.30659-2-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov --- kernel/bpf/verifier.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 2ff22ef42348..527fa80be429 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -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; -- 2.47.2