linux-kernel - Re: [PATCH bpf-next v2 3/3] bpf: Use BPF_KFUNC macro at all kfunc definitions

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Message-ID: <87o7qphspq.fsf@meer.lwn.net>
Date:   Mon, 23 Jan 2023 14:00:17 -0700
From:   Jonathan Corbet <corbet@....net>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        David Vernet <void@...ifault.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...a.com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        kernel-team@...a.com, memxor@...il.com
Subject: Re: [PATCH bpf-next v2 3/3] bpf: Use BPF_KFUNC macro at all kfunc
 definitions

Daniel Borkmann <daniel@...earbox.net> writes:

> Did you look into making this similar to the EXPORT_SYMBOL() infra? If possible
> that would look much more natural to developers, e.g. :
>
> struct nf_conn *
> bpf_skb_ct_lookup(struct __sk_buff *skb_ctx, struct bpf_sock_tuple *bpf_tuple,
>   		  u32 tuple__sz, struct bpf_ct_opts *opts, u32 opts__sz)
> {
> 	[...]
> }
>
> EXPORT_BPF_KFUNC(bpf_skb_ct_lookup);

That was my question too; it's a similar functionality that would be
nice to express in a similar way.  Even better, if possible, might be to
fold it into BTF_ID_FLAGS, which I might then rename to EXPORT_KFUNC()
or some such ... :)

Thanks,

jon