netdev - Re: e1000 tcp checksum incorrect, x86 64b

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Fri, 28 Sep 2007 13:39:34 -0400
From:	"Jon Smirl" <jonsmirl@...il.com>
To:	"Rick Jones" <rick.jones2@...com>
Cc:	"Herbert Xu" <herbert@...dor.apana.org.au>, netdev@...r.kernel.org
Subject: Re: e1000 tcp checksum incorrect, x86 64b

On 9/28/07, Rick Jones <rick.jones2@...com> wrote:
> Herbert Xu wrote:
> > Jon Smirl <jonsmirl@...il.com> wrote:
> >
> >>App is writing seven bytes to the socket. Socket write timeout expires
> >>and the seven bytes are sent. The checksum is not getting inserted
> >>into the packet. It is set to a constant 0x8389 instead of the right
> >>value.  App is gmpc 0.15.4.95, Revision: 6794
> >>
> >>Attached Wireshark packet trace show the problem. e1000 is 192.168.1.4
> >>64bit, Q6600. Dell Dimension 9200
> >
> >
> > Wireshark is broken.  It needs to know TP_STATUS_CSUMNOTREADY
> > means that the checksum is partial and will only be completed
> > when the hardware sends the packet out.
> >
> > Alternatively disable checksum offload with ethtool.
>
> Or take the packet traces "outboard" of the NIC somewhere/somehow.
>
> What problem(s) led to your taking the packet trace in the first place?

I was working on the Ethernet driver for another embedded system
attached to the box. I noticed these errors going to my NSLU2 which I
thought was working ok. But now I know they are not real errors.

Ethernet driver for MPC5200 in embedded system still has some
problems. It is being discussed on linuxppc-embedded.

-- 
Jon Smirl
jonsmirl@...il.com
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html