linux-kernel - Re: [PATCHv2 3/7] lib: add rocksoft model crc64

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Date:   Wed, 2 Feb 2022 14:13:33 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Cc:     axboe@...nel.dk, hch@....de, martin.petersen@...cle.com,
        colyli@...e.de, Eric Biggers <ebiggers@...nel.org>
Subject: Re: [PATCHv2 3/7] lib: add rocksoft model crc64

On 2/1/22 20:01, Keith Busch wrote:
> The NVM Express specification extended data integrity fields to 64 bits
> using the Rocksoft^TM parameters. Add the poly to the crc64 table
> generation, and provide a library routine implementing the algorithm.
> 
> The Rocksoft 64-bit CRC model parameters are as follows:
>      Poly: 0xAD93D23594C93659
>      Initial value: 0xFFFFFFFFFFFFFFFF
>      Reflected Input: True
>      Reflected Output: True
>      Xor Final: 0xFFFFFFFFFFFFFFFF
> 
> Since this model used reflected bits, the implementation generates the
> reflected table so the result is ordered consistently.
> 
> Cc: Eric Biggers <ebiggers@...nel.org>
> Signed-off-by: Keith Busch <kbusch@...nel.org>
> ---
> v1->v2:
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@...e.de			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer