linux-kernel - Re: [EXTERNAL] Re: [EXTERNAL] Re: [PATCH v2 0/6] Add support for Texas Instruments MCRC64 engine

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Date:   Tue, 3 Oct 2023 11:37:40 +0530
From:   Kamlesh Gurudasani <kamlesh@...com>
To:     Eric Biggers <ebiggers@...nel.org>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [EXTERNAL] Re: [EXTERNAL] Re: [PATCH v2 0/6] Add support for
 Texas Instruments MCRC64 engine

Kamlesh Gurudasani <kamlesh@...com> writes:

>>
>> Here, if we consider similar numbers for crc64 PMULL implementation as
>> crc32 (case 2) , we save good number of cpu cycles using mcrc64
>> in case of files bigger than 5-10mb as most of the time is being spent in HW offload.
>>
>> Regards,
>> Kamlesh
>
> Hi Eric,
>
> Please let me know if above numbers make sense to you and I should send
> next revision.

Hi Eric,

I understand that there is no in-kernel user for crc64-iso3309 and this
is new algorithm that we are trying to add in linux kernel.

As per your suggestion we did the calculations and it turns out to be we
are saving good number of cpu cycles with HW offload.

Also, there are some automotive customers who have a safety
requirement to offload any parameters that are in Linux to ensure FFI.

Let me know if you are willing to accept this driver, so that I can put
efforts to send next revision.

Regards,
Kamlesh