Re: [PATCH] bpf: export btf_find_by_name_kind and bpf_base_func_proto

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On Fri, Jul 26, 2024 at 11:21 AM Yonghong Song <yonghong.song@xxxxxxxxx> wrote:
>
>
> On 7/24/24 2:13 AM, Ming Lei wrote:
> > On Tue, Jul 23, 2024 at 09:43:12PM -0700, Kui-Feng Lee wrote:
> >>
> >> On 7/23/24 20:19, Ming Lei wrote:
> >>> Export btf_find_by_name_kind and bpf_base_func_proto, so that kernel
> >>> module can use them.
> >>>
> >>> Almost all existed struct_ops users(hid, sched_ext, ...) need the two APIs.
> >>>
> >>> Without this change, hid-bpf can't be built as module.
> >> Could you give me more context?
> >> Give me a link of an example code or something?
> >> Or explain the use case?
> > The merged patchset "Registrating struct_ops types from modules" is
> > trying to allow module to register struct_ops, which often needs
> > bpf_base_func_proto()(for allowing generic helpers available in
> > prog) and btf_find_by_name_kind() (for implementing .btf_struct_access).
> >
> > One example is hid-bpf, which is a driver and supposed to build as module,
> > but it can't be done because the two APIs aren't exported.
>
> Could you give more specific examples about where these two APIs are
> used in hid-bpf?

Sure, hid-bpf struct_ops has been merged to linus tree already.

However, it can't be built as module because the two APIs aren't exported:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/hid/bpf/hid_bpf_struct_ops.c

Thanks,
Ming






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