From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Sat, 30 Aug 2003 19:01:00 -0700
From: "David S. Miller" <davem@redhat.com>
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	<20030827132810.65010eac.shemminger@osdl.org>
	<p05111b00bb740b63506b@[10.96.96.13]>
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Subject: [Bridge] Re: [more info] Re: [2.4.22] bad interaction between e100 and
 bridge: BUG at dev.c:991!
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To: Hannes Schulz <schulz@schwaar.com>
Cc: shemminger@osdl.org, scott.feldman@intel.com, jgarzik@pobox.com, linux-net@vger.kernel.org, bridge@osdl.org

On Thu, 28 Aug 2003 22:24:52 +0200
Hannes Schulz <schulz@schwaar.com> wrote:

> >Could the problem be that the e100 can do IP receive checksumming on 
> >the board,
> >but the eepro driver doesn't enable it.  When the board is doing checksum
> >offload, then the csum field isn't set.
> >
> >Please try disabling receive checksumming on the e100 driver
> >
> >	modprobe e100 XsumRX=0
> >
> >If this is the problem, it exists both 2.4 and 2.6.
> 
> Indeed: with  XsumRX=0,0 the BUG doesn't happen. I put some debugging 
> code in dev.c:

Looks like bridging is taking an input packet, transmitting it but not
initializing skb->csum, skb->ip_summed, and other fields before doing
so.

Definitely a bridging bug.