linux-kernel - Re: [PATCH] make csum

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Date:	Tue, 03 Apr 2007 12:27:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	randy.dunlap@...cle.com
Cc:	andi@...stfloor.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, sam@...nborg.org
Subject: Re: [PATCH] make csum_partial obj-y

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.

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