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
Apparently (http://developer.intel.com/design/network/82559.htm) the i82559
can offload TCP and UDP checksums. A quick peruse of
/usr/src/sys/pci/if_fxp.c shows we are not currently using this - which is
fair enough since the driver also has to work with 82557 and 82558.
It strikes me that due
Don't some of the Gigabit FreeBSD drivers actually utilize
the on-board
checksum processing???
H, 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
(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
It was mail from Andrew Gallatin ([EMAIL PROTECTED]), but it was private so
I can't just redistribute it. Andrew- want to comment?
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
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
-- Forwarded message --
Date: Tue, 20 Jun 2000 19:57:04 -0400 (EDT)
From: Andrew Gallatin [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: RE: IP checksum offloading with intel 82559 fast ethernet.
Matthew Jacob writes:
Sorry- they're talking about IP checksum offloading
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.
Yeah, well, there's a couple of things that supposedly can be done about that.
For transmit, there's a start/offset you can do which could allow to
On Tue, 23 Nov 1999, Clinton Xavier Berni wrote:
Hey,
I am sort of confused with the parameters for IPsumReplaceShort function,
I understand that I will pass the ip-ip_sum for the cksump parameter.
but I am not able to understand wht oldvap newvalp stand for..
cksump points to the
Hey,
I am sort of confused with the parameters for IPsumReplaceShort function,
I understand that I will pass the ip-ip_sum for the cksump parameter.
but I am not able to understand wht oldvap newvalp stand for..
Xavier.
On Mon, 22 Nov 1999, Julian Elischer wrote:
How many bytes have you
On Tue, 23 Nov 1999, Parthasarathy M. Aji wrote:
!Hey,
!
!I am trying to recompute the checksum of an IP packet. I use
!netinet/in_chksum.c to do this. The values returned are not correct. I've
!reset the ip_sum field to 0 before doing the sum. Is there something
!missing?
!
!thanks
!
!
How many bytes have you changed?
is it possible that some of the values have already been ntohs()'d
or something similar?
rather than recalculate the whole packet, just update the exisitng
value.
there is an rfc for this but it took me a while to get
the code right in C on a 386. The trick is
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