netdev - Re: Ethernet CRC questions

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Message-ID: <1262108376.5941.5.camel@localhost>
Date:	Tue, 29 Dec 2009 18:39:36 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	thomas yang <lampsu@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Ethernet CRC questions

On Wed, 2009-12-30 at 01:17 +0800, thomas yang wrote:
> How does Linux  generate Ethernet CRC ?
> by the hardware (Ethernet controller)  or  use crc32_le() /
> crc32_be()     ( lib/crc32.c )  ?
> 
> P.S.   my  network card is  rtl8139d  , use  8139too driver

The Ethernet frame CRC is normally generated and verified in hardware.
These library functions are needed for the few MACs that don't, or where
the same CRC function is used for some other purpose (e.g. as a hash
function for multicast filtering).

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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