From: Rick Jones <rick.jones2@hp.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jon Smirl <jonsmirl@gmail.com>, netdev@vger.kernel.org
Subject: Re: e1000 tcp checksum incorrect, x86 64b
Date: Fri, 28 Sep 2007 09:35:07 -0700 [thread overview]
Message-ID: <46FD2D3B.4050605@hp.com> (raw)
In-Reply-To: <E1Ib79E-0006CN-00@gondolin.me.apana.org.au>
Herbert Xu wrote:
> Jon Smirl <jonsmirl@gmail.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?
rick jones
next prev parent reply other threads:[~2007-09-28 16:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-28 3:50 e1000 tcp checksum incorrect, x86 64b Jon Smirl
2007-09-28 4:08 ` Herbert Xu
2007-09-28 16:35 ` Rick Jones [this message]
2007-09-28 17:39 ` Jon Smirl
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