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

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Message-ID: <E3649A44-D11F-426A-A65D-ED40AA3B0214@fb.com>
Date:   Wed, 10 Nov 2021 22:11:18 +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 2:02 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?

Thanks,
Song