netdev - Re: [PATCH bpf-next] bpf: extend BTF_ID_LIST_GLOBAL with parameter for number of IDs

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Date:   Wed, 10 Nov 2021 14:13:49 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Kernel Team <Kernel-team@...com>,
        "syzbot+e0d81ec552a21d9071aa@...kaller.appspotmail.com" 
        <syzbot+e0d81ec552a21d9071aa@...kaller.appspotmail.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH bpf-next] bpf: extend BTF_ID_LIST_GLOBAL with parameter
 for number of IDs

On Wed, Nov 10, 2021 at 2:11 PM Song Liu <songliubraving@...com> wrote:
>
>
>
> > On Nov 10, 2021, at 2:02 PM, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> >
> > On Wed, Nov 10, 2021 at 9:47 AM Song Liu <songliubraving@...com> wrote:
> >>
> >> -#ifdef CONFIG_DEBUG_INFO_BTF
> >> -BTF_ID_LIST_GLOBAL(btf_sock_ids)
> >> +BTF_ID_LIST_GLOBAL(btf_sock_ids, MAX_BTF_SOCK_TYPE)
> >> #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type)
> >> BTF_SOCK_TYPE_xxx
> >> #undef BTF_SOCK_TYPE
> >> -#else
> >> -u32 btf_sock_ids[MAX_BTF_SOCK_TYPE];
> >> -#endif
> >
> > If we're trying to future proof it I think it would be better
> > to combine it with MAX_BTF_SOCK_TYPE and BTF_SOCK_TYPE_xxx macro.
> > (or have another macro that is tracing specific).
> > That will help avoid cryptic btf_task_struct_ids[0|1|2]
> > references in the code.
>
> Yeah, this makes sense.
>
> I am taking time off for tomorrow and Friday, so I probably won't
> have time to implement this before 5.16-rc1. How about we ship
> this fix as-is, and improve it later?

It's not rc1 material. It's in bpf-next only. There is no rush, I think.