From owner-freebsd-stable  Mon Dec  4 18:41:15 2000
From owner-freebsd-stable@FreeBSD.ORG  Mon Dec  4 18:41:11 2000
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from netau1.alcanet.com.au (ntp.alcanet.com.au [203.62.196.27])
	by hub.freebsd.org (Postfix) with ESMTP id 7323E37B69C
	for <freebsd-stable@FreeBSD.ORG>; Mon,  4 Dec 2000 18:41:09 -0800 (PST)
Received: from mfg1.cim.alcatel.com.au (mfg1.cim.alcatel.com.au [139.188.23.1])
	by netau1.alcanet.com.au (8.9.3 (PHNE_18979)/8.9.3) with ESMTP id NAA22141;
	Tue, 5 Dec 2000 13:41:03 +1100 (EDT)
Received: from gsmx07.alcatel.com.au by cim.alcatel.com.au
 (PMDF V5.2-32 #37645) with ESMTP id <01JXCICWSPR4EAFFW1@cim.alcatel.com.au>;
 Tue, 5 Dec 2000 13:40:59 +1100
Received: (from jeremyp@localhost)	by gsmx07.alcatel.com.au (8.11.0/8.11.0)
 id eB52esK96410; Tue, 05 Dec 2000 13:40:54 +1100 (EST envelope-from jeremyp)
Content-return: prohibited
Date: Tue, 05 Dec 2000 13:40:54 +1100
From: Peter Jeremy <peter.jeremy@alcatel.com.au>
Subject: Re: Full size vlan packets.
In-reply-to: <14865.20151.114515.408874@trooper.velocet.net>; from
 dgilbert@velocet.ca on Tue, Nov 14, 2000 at 09:39:51AM -0500
To: David Gilbert <dgilbert@velocet.ca>
Cc: freebsd-stable@FreeBSD.ORG
Mail-followup-to: David Gilbert <dgilbert@velocet.ca>,
 freebsd-stable@FreeBSD.ORG
Message-id: <20001205134053.A95349@gsmx07.alcatel.com.au>
MIME-version: 1.0
Content-type: text/plain; charset=us-ascii
Content-disposition: inline
User-Agent: Mutt/1.2.5i
References: <14865.20151.114515.408874@trooper.velocet.net>
Sender: jeremyp@gsmx07.alcatel.com.au
Sender: owner-freebsd-stable@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

[Catching up on old mail]
On 2000-Nov-14 09:39:51 -0500, David Gilbert <dgilbert@velocet.ca> wrote:
>I posted a request here some time ago about getting FreeBSD to do full 
>sized VLAN packets.

I have boxes doing this running both -STABLE and -CURRENT (both somewhat
old, but I'm in the process of upgrading the -STABLE machine).

There are two major issues involved in getting this to work:
1) ifconfig on a vlan will set to the MTU to the MTU of the parent
   device - 4 unless the parent device's header length is the length
   of a VLAN header.  This can be over-ridden by explicitly specifying
   the MTU in the ifconfig command.  The header length (ifi_hdrlen)
   doesn't appear to be used elsewhere so it should also be possible to
   change the header length on the parent device, but my initial
   attempt to do this didn't work correctly.
2) The individual ethernet drivers need to be patched to support the
   larger packets.  This is driver-dependent and varies from just
   changing the receive buffer size to playing with bits that are
   only documented under NDA.

There are also assorted buglets in the general VLAN support:
- kern/20611: VLAN parent device does not count VLAN output bytes
- bin/21880: (libcap/tcpdump don't allow matching on VLAN packets)
- kern/19436 (arp(8) doesn't support VLANs)

At the device level, I have patches for tx (SMC 83c170), fxp
(Intel 82559), xl (3Com 3c905B and later) and tl (TI ThunderLAN).
(The latter two untested).

Peter


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-stable" in the body of the message