From owner-freebsd-hackers  Sun Dec 16  7:28:36 2001
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Date: Sun, 16 Dec 2001 10:27:56 -0500 (EST)
To: David Greenman <dg@root.com>
Cc: rsharpe@ns.aus.com, freebsd-hackers@FreeBSD.ORG
Subject: Re: Does anyone know if the Broadcom BCM5700 has problems with HW csum?
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David Greenman writes:
 > >David Greenman wrote:
 > >> >In any case, disabling it is what ClickArray ended up doing, as well,
 > >> >for the Tigon II, until the firmware could be fixed.
 > >> 
 > >>    We're talking about the Tigon III (bge driver for Broadcom BCM5700/BCM5701).
 > >
 > >Crap.  Thanks for the info.
 > >
 > >Have you manually calculated the checksum on a bad packet to see
 > >how it's off?
 > 
 >    Yes. It's typically off by 0x1051, but varies depending on the TCP/IP
 > header contents.

Hmm.. Since you've already got the code for calculating the checksum
in the driver written, why not use it?  Eg, why not pass the csum up &
set CSUM_DATA_VALID iff the csum ends up being 0? Are you worried that
the firmware will yield false posatives too?

Drew

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