The checksome off loading for the Intel gigabit card is broken. All you
get is the checksum of the frame, so it really isn't all that useful.
paul
Matthew Jacob ([EMAIL PROTECTED]) wrote:
>
>
> (I'm the wx author)... I want to do checksum offloading too at some point.
>
> There's been some work done on this by Andrew Gallatin and Ken Merry amongst
> others insofar as I recall, but I don't believe it's been checked in. Let me
> see if I can dig up the mail..
>
> Everyone's at Usenix this week && next, so don't expect too much of a
> response.
>
> -matt
>
>
> On Wed, 21 Jun 2000, Dave Preece wrote:
>
> > > Don't some of the Gigabit FreeBSD drivers actually utilize
> > > the on-board
> > > checksum processing???
> >
> > Hmmmm, can't see anything specific.... Looking at if_wx.c we have a function
> > wx_start(ifp) where ifp is an ifnet pointer. ifnet has a member if_snd, of
> > type ifqueue (according to the man page). And ifqueue is a safe looking
> > memory buffer, but no actual statement as to whether we are expected to put
> > raw packets on the queue or.... what. Presumably entire ethernet frames are
> > put on the queue so we can spoof ethernet mac addresses occasionally - but
> > no real way of indicating to the card that we have put an IP packet on with
> > no checksum (and could you calculate it for me please).
> >
> > As an aside, if checksum calculations were offloadable via a call across PCI
> > (i.e. send raw packet, get packet back with tcp calculated, queue packet for
> > delivery), then it's a bit touch and go as to whether this is actually a
> > good idea - given that we'll start to load up PCI quite badly doing this.
> >
> > > Nice to see someone keeping our drivers fresh :-)
> >
> > Oh, no. I wish. I'm well off the end of my abilities here, but clearly into
> > what I 'owe' the community in general. Hopefully I'll get there at some
> > time.
> >
> > > -marc
> >
> > Dave
> >
> >
> >
> > To Unsubscribe: send mail to [EMAIL PROTECTED]
> > with "unsubscribe freebsd-hackers" in the body of the message
> >
>
>
>
>
>
> To Unsubscribe: send mail to [EMAIL PROTECTED]
> with "unsubscribe freebsd-hackers" in the body of the message
--
Paul Saab
Technical Yahoo
[EMAIL PROTECTED] - [EMAIL PROTECTED] - [EMAIL PROTECTED]
Do You .. uhh .. Yahoo!?
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
