From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@osdl.org>
Subject: Re: 2.6.8-rc2-mm1 breaks PPPoE for me (was: 2.6.8-rc2-mm1)
Date: Mon, 2 Aug 2004 14:27:06 -0700
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	<20040731100947.GA7453@merlin.emma.line.org>
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To: Matthias Andree <matthias.andree@gmx.de>
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Matthias Andree <matthias.andree@gmx.de> wrote:
>
> On Wed, 28 Jul 2004, Andrew Morton wrote:
> 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.8-rc2/2.6.8-rc2-mm1/
> ...
> > gcc35-pppoe.c.patch
> >   gcc-3.5 fixes
> 
> Andrew,
> 
> I'm not sure if my problem is related to this patch, but in
> 2.6.8-rc2-mm1, PPPoE doesn't work for me, kernel compiled with gcc (GCC)
> 3.3.1 (SuSE Linux), a vanilla 2.6.7 is fine with the same compiler.
> 
> pppd[5685]: Plugin /usr/lib/pppd/2.4.1/pppoe.so loaded.
> pppd[5685]: PPPoE Plugin Initialized
> pppd[5685]: pppd 2.4.1 started by root, uid 0
> pppd[5685]: Sending PADI
> pppd[5685]: HOST_UNIQ successful match 
> pppd[5685]: Failed to negotiate PPPoE connection: 25 Inappropriate ioctl for device
> pppd[5685]: Exit.
> 
> A successful pppd session start, with 2.6.7, looks like this:
> 
> pppd[5070]: PPPoE Plugin Initialized
> pppd[5070]: pppd 2.4.1 started by root, uid 0
> pppd[5070]: Sending PADI
> pppd[5070]: HOST_UNIQ successful match 
> pppd[5070]: HOST_UNIQ successful match 
> pppd[5070]: Got connection: 164b
> pppd[5070]: Connecting PPPoE socket: 00:90:1a:XX:XX:XX 4b16 eth1 0x808a560
> /sbin/hotplug[5166]: INTERFACE=ppp0
> pppd[5070]: Using interface ppp0
> pppd[5070]: Connect: ppp0 <--> eth1
> pppd[5070]: Setting MTU to 1492.
> pppd[5070]: Couldn't increase MRU to 1500
> pppd[5070]: Setting MTU to 1492.
> pppd[5070]: local  IP address 217.81.XXX.XXX
> pppd[5070]: remote IP address 217.5.XXX.XXX
> pppd[5070]: Script /etc/ppp/ip-up finished (pid 5180), status = 0x0
> 

I'm a bit stumped by this - I'm not aware of any change which would have
caused the pppoe device to start returning -ENOTTY.

Is this still happening?  Are you sure the relevant modules are loaded? 
Could you capture an strace of pppd while it's happening?