linux-kernel - Re: [PATCH] make csum

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Message-ID: <4612AB88.1000504@oracle.com>
Date:	Tue, 03 Apr 2007 12:31:20 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	David Miller <davem@...emloft.net>
CC:	andi@...stfloor.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, sam@...nborg.org
Subject: Re: [PATCH] make csum_partial obj-y

David Miller wrote:
> From: Randy Dunlap <randy.dunlap@...cle.com>
> Date: Tue, 03 Apr 2007 12:09:33 -0700
> 
>> How does the networking code work across multiple architectures?
> 
> This has been discussed before.
> 
> The csum_partial() result value is only well defined modulo 0xffff.
> 
> The networking does csum_fold() or similar on the results, and so the
> right thing always happens there.
> 
> The reiserfs case is the worst because even ignoring the differences
> in csum_partial() return values, it always feeds this into
> cpu_to_le32() which basically means that it is putting a cpu-endian
> dependent value onto disk.  csum_partial() returns a fixed-endian,
> not cpu endian, value.  So feeding it into cpu_to_anything() is
> quite wrong.

Thanks David and Andi.  I get it.

-- 
~Randy
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