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libbpf: Add ability to get/set per-program load flags

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Add bpf_program__flags() API to retrieve prog_flags that will be (or
were) supplied to BPF_PROG_LOAD command.

Also add bpf_program__set_extra_flags() API to allow to set *extra*
flags, in addition to those determined by program's SEC() definition.
Such flags are logically OR'ed with libbpf-derived flags.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211111051758.92283-2-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2021-11-10 21:17:57 -08:00
committed by Andrii Nakryiko
parent 932800b20b
commit 0e80b7dc3f
3 changed files with 19 additions and 0 deletions
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14
src/libbpf.c
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@@ -8262,6 +8262,20 @@ void bpf_program__set_expected_attach_type(struct bpf_program *prog,
prog->expected_attach_type = type;
}
__u32 bpf_program__flags(const struct bpf_program *prog)
{
return prog->prog_flags;
}
int bpf_program__set_extra_flags(struct bpf_program *prog, __u32 extra_flags)
{
if (prog->obj->loaded)
return libbpf_err(-EBUSY);
prog->prog_flags |= extra_flags;
return 0;
}
#define SEC_DEF(sec_pfx, ptype, atype, flags, ...) { \
.sec = sec_pfx, \
.prog_type = BPF_PROG_TYPE_##ptype, \