netdev - Re: [PATCH v9 bpf-next 00/17] bpf: eliminate zero extensions for sub-register writes

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Date:   Sat, 25 May 2019 10:09:13 +0100
From:   Jiong Wang <jiong.wang@...ronome.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Jiong Wang <jiong.wang@...ronome.com>, daniel@...earbox.net,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        oss-drivers@...ronome.com, davem@...emloft.net,
        paul.burton@...s.com, udknight@...il.com, zlim.lnx@...il.com,
        illusionist.neo@...il.com, naveen.n.rao@...ux.ibm.com,
        sandipan@...ux.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, jakub.kicinski@...ronome.com
Subject: Re: [PATCH v9 bpf-next 00/17] bpf: eliminate zero extensions for sub-register writes


Alexei Starovoitov writes:

> On Fri, May 24, 2019 at 11:25:11PM +0100, Jiong Wang wrote:
>> v9:
>>   - Split patch 5 in v8.
>>     make bpf uapi header file sync a separate patch. (Alexei)
>
> 9th time's a charm? ;)

Yup :), it's all good things and helped us reaching a solution that fits
verifier's existing infra.

> Applied.
> Thanks a lot for all the hard work.
> It's a great milestone.

Thanks. And I guess the answer to the question:

  "Q: BPF 32-bit subregister requirements"

inside Documentation/bpf/bpf_design_QA.rst now could be updated to
mention LLVM and JIT back-ends 32-bit supports, will send out an update on
this.

> Please follow up with an optimization for bpf_patch_insn_data()
> to make it scaleable and undo that workaround in scale tests.

Sure, will do.

Regards,
Jiong