Date: Sat, 25 Mar 2000 15:11:29 -0800 From: "Sam Leffler" <sam@errno.com> To: <justin@apple.com>, <hackers@FreeBSD.ORG>, <net@FreeBSD.ORG> Subject: Re: Request for review (HW checksum patches) Message-ID: <077a01bf96af$73dab720$0132a8c0@MELANGE> References: <200003252050.MAA08969@scv1.apple.com>
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FWIW, Win2000 has a mechanism for dealing with what they call task
offloading. If you decide to attack the problem, an inexpensive device you
can use for testing is the 3C905B; it does IP+TCP checksums.
Sam
----- Original Message -----
From: "Justin C. Walker" <justin@apple.com>
To: <hackers@FreeBSD.ORG>; <net@FreeBSD.ORG>
Sent: Saturday, March 25, 2000 12:49 PM
Subject: Re: Request for review (HW checksum patches)
> > From: Jonathan Lemon <jlemon@flugsvamp.com>
> > Date: Sat, 25 Mar 2000 13:35:53 -0600
> > To: net@FreeBSD.ORG, hackers@FreeBSD.ORG
> > Subject: Request for review (HW checksum patches)
> > X-Mailer: Mutt 1.0pre2i
> > Delivered-to: freebsd-net@freebsd.org
> > X-Loop: FreeBSD.org
> >
> > I have a set of patches which allows offloading checksums to
> > NICs which support it (right now, only the Alteon based cards).
> > The patch is at <http://www.freebsd.org/~jlemon/csum.patch>.
>
> This prompts a question on a related issue: there seems to be an increase
> in support of protocol operations on NICs (e.g., tickle/keep-alive support
> while the system is sleeping; IPSec; ...). Is there enough there to let
us
> build a general mechanism for communication between stack and driver for
> this sort of thing (e.g., a "meta-data" slot in the packet header which
> points to an mbuf, or other structure, that contains the details)?
>
> We're currently trying to deal with this in Mac OS X, and it'd be nice to
> avoid having multiple wheels of different size and shape in the same
source
> base.
>
> Regards,
>
> Justin
>
>
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