netdev - Re: e100 + VLANs?

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Date:	Mon, 10 Oct 2011 12:19:54 +0200
From:	David Lamparter <equinox@...c24.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Michael Tokarev <mjt@....msk.ru>,
	netdev <netdev@...r.kernel.org>
Subject: Re: e100 + VLANs?

On Sat, Oct 08, 2011 at 11:34:40AM -0700, Jeff Kirsher wrote:
> On 10/08/2011 09:24 AM, Eric Dumazet wrote:
> > Le samedi 08 octobre 2011 à 14:08 +0400, Michael Tokarev a écrit :
> >> > Yesterday I tried to use 802.1Q VLAN tagging with an (oldish)
> >> > e100-driven network card, identified by lspci like this:
> >> > 
> >> >  00:12.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 (rev 02)
> >> > 
> >> > Just to discover that it does not quite work: packets of
> >> > size 1497+ bytes gets lost.
[...]
> > e100 driver seems VLAN enabled at a first glance.
> Eric is correct, that e100 does support VLANs.
> 
> In addition to Eric's suggestion, can you also provide all the output of
> lspci -vvv for the network card?

I'm opening the lore box here, but early e100 cards AFAIK have a 
hardware limit at 1500 (+18 src/dst/proto) bytes. At least, Juniper's
JUNOS does not support full-sized .1Q on their e100 control plane
interfaces...


-equi
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