netdev - Re: [PATCH] arm64: do_csum: implement accelerated scalar version

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Message-ID: <37fbc2a3-069d-9f75-f3d0-3eda2efa5c9b@hisilicon.com>
Date:   Fri, 16 Aug 2019 16:15:25 +0800
From:   Shaokun Zhang <zhangshaokun@...ilicon.com>
To:     Will Deacon <will.deacon@....com>
CC:     Robin Murphy <robin.murphy@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <ilias.apalodimas@...aro.org>,
        "huanglingyan (A)" <huanglingyan2@...wei.com>,
        <steve.capper@....com>
Subject: Re: [PATCH] arm64: do_csum: implement accelerated scalar version

Hi Will,

On 2019/8/16 0:46, Will Deacon wrote:
> On Thu, May 16, 2019 at 11:14:35AM +0800, Zhangshaokun wrote:
>> On 2019/5/15 17:47, Will Deacon wrote:
>>> On Mon, Apr 15, 2019 at 07:18:22PM +0100, Robin Murphy wrote:
>>>> On 12/04/2019 10:52, Will Deacon wrote:
>>>>> I'm waiting for Robin to come back with numbers for a C implementation.
>>>>>
>>>>> Robin -- did you get anywhere with that?
>>>>
>>>> Still not what I would call finished, but where I've got so far (besides an
>>>> increasingly elaborate test rig) is as below - it still wants some unrolling
>>>> in the middle to really fly (and actual testing on BE), but the worst-case
>>>> performance already equals or just beats this asm version on Cortex-A53 with
>>>> GCC 7 (by virtue of being alignment-insensitive and branchless except for
>>>> the loop). Unfortunately, the advantage of C code being instrumentable does
>>>> also come around to bite me...
>>>
>>> Is there any interest from anybody in spinning a proper patch out of this?
>>> Shaokun?
>>
>> HiSilicon's Kunpeng920(Hi1620) benefits from do_csum optimization, if Ard and
>> Robin are ok, Lingyan or I can try to do it.
>> Of course, if any guy posts the patch, we are happy to test it.
>> Any will be ok.
> 
> I don't mind who posts it, but Robin is super busy with SMMU stuff at the
> moment so it probably makes more sense for you or Lingyan to do it.

Thanks for restarting this topic, I or Lingyan will do it soon.

Thanks,
Shaokun

> 
> Will
> 
> .
>