From owner-freebsd-hackers  Wed Jun 21  0:40:18 2000
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	id BC84C37B9BA; Wed, 21 Jun 2000 00:40:15 -0700 (PDT)
Subject: Re: IP checksum offloading with intel 82559 fast ethernet.
In-Reply-To: <67B808B0DD93D211ABEE0000B498356B02BCD2@internet.kbgroup.co.nz> from Dave Preece at "Jun 21, 2000 11:53:00 am"
To: dave.preece@kbgroup.co.nz (Dave Preece)
Date: Wed, 21 Jun 2000 00:40:14 -0700 (PDT)
Cc: marc@netstor.com, freebsd-hackers@freebsd.org
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From: wpaul@FreeBSD.ORG (Bill Paul)
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> > Don't some of the Gigabit FreeBSD drivers actually utilize 
> > the on-board
> > checksum processing???

FreeBSD 5.0-current has support for TCP/IP checksum offload, and the
if_ti driver makes use of it. The Tigon NICs do this in firmware though.
I attempted to add support to the SysKonnect driver, however the transmit
side checksum offload support apparently doesn't work, and the receive
side offloading has a bug which requires a bit of a workaround.

The 3Com 3c90xB/3c90xC chips are also supposed to support checksum
offload, but as of yet I haven't had much luck getting this to work
either.

-Bill 


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