netdev - Re: [PATCH net] mctp: serial: Fix starting value for frame check sequence

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Date:   Sat, 17 Dec 2022 14:44:29 +0800
From:   Jeremy Kerr <jk@...econstruct.com.au>
To:     Alexander H Duyck <alexander.duyck@...il.com>,
        netdev@...r.kernel.org
Cc:     Matt Johnston <matt@...econstruct.com.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Harsh Tyagi <harshtya@...gle.com>
Subject: Re: [PATCH net] mctp: serial: Fix starting value for frame check
 sequence


Hi Alexander.

> Since the starting value isn't unique would it possibly be worthwhile
> to look at adding a define to include/linux/crc-ccitt.h to be used to
> handle the cases where the initial value is 0xffff? I notice there
> seems to only be two starting values 0 and 0xffff for all callers so
> it might make sense to centralize it in one place.

Yep, that would make sense if they're commonly used values, but I'm not
sure that would be suitable to include that in this fix, as it would
just add disruption to any backport work.

Cheers,


Jeremy