Re: hw tcp v4 csum failed on 2.4.23-rc2 with e100

[Felix Radensky (felix@allot.com)]

Hi, Rask

Rask Ingemann Lambertsen wrote:

> On Fri, Nov 21, 2003 at 12:32:31PM +0200, Felix Radensky wrote:
>  
>
> > Hi,
> >
> > I keep getting tons of this messages with 2.4.23-rc2
> > and e100 driver:
> >
> > hw tcp v4 csum failed
> > hw tcp v4 csum failed
> > ....
> >
> > Is it a hardware problem or e100 problem ?
> >    
>
> It could be neither. It just means that the checksum in the packet was in
> disagreement (for lack of better word) with the checksum calculated by the
> hardware. If I read the tcp_ipv4 code right, then all it takes for that
> message to be printed is a packet with an incorrect checksum to be received
> by a device which supports hardware checksum calculation.
>
> Which type of packets are you receiving when you get this message? VLAN,
> 802.2 LLC or something else other than plain IP over Ethernet?
>  
It's a plain IP over Ethernet, WWW traffic.

>  
>
> > The problem goes away if driver is loaded with XsumRX=0.
> >    
>
> What does "netstat -s | grep -F -e 'bad segments received'" give (with and
> without hardware checksumming)?
I get nonzero value with and without  hardware checksumming.

> Does "ip -s -s link show" show any CRC errors?
No. All counters, except Rx and Tx are 0.

Felix.


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