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 22:18:13 +0000
From:   Song Liu <songliubraving@...com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.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 Nov 10, 2021, at 2:13 PM, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> 
> 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.

Aha, I guess I messed up the branches.

Song