Re: 2.4.19pre10aa3

Andrea Arcangeli
2002-06-20T13:18:38Z

On Thu, Jun 20, 2002 at 03:44:59PM +0400, Andrey Nekrasov wrote:
> Hello Andrea Arcangeli,
>
>
> Kernel 2.4.19pre10aa3 + hidden_arp (from LVS)
>
>
>
> ...
> Intel(R) PRO/100 Fast Ethernet Adapter - Loadable driver, ver 1.8.38
> Copyright (c) 2002 Intel Corporation
>
> eth0: Intel(R) 8255x-based Ethernet Adapter
> Mem:0xfb101000 IRQ:18 Speed:100 Mbps Dx:Full
> Hardware receive checksums enabled
> cpu cycle saver enabled
> ...
>
> ...
> eth0 e100_wait_exec_cmd: Wait failed.
> hw tcp v4 csum failed
> hw tcp v4 csum failed
> hw tcp v4 csum failed
> hw tcp v4 csum failed
> hw tcp v4 csum failed
> hw tcp v4 csum failed
> hw tcp v4 csum failed
> ...
>
>
> Than this message is caused? It something serious also can be problems?

probably a driver issue with hw checksum. btw interestingly the stack
computes the cksum by hand for every tcp incoming packet (unless
ip_summed is set by the driver to CHECKSUM_UNNECESSARY), this is how it
noticed the hw checksum was wrong. I guess it's either an e100 driver
issue, or an hardware issue. Maybe it's setting DF_CSUM_OFFLOAD for your
card despite your hardware doesn't support that feature, or maybe
there's something wrong in the logic that sets the skb->csum.

Andrea