From owner-freebsd-net  Thu Feb 15  8:39: 8 2001
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Message-ID: <3A8C0614.3131FB3@elischer.org>
Date: Thu, 15 Feb 2001 08:38:44 -0800
From: Julian Elischer <julian@elischer.org>
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To: Adrian Chadd <adrian@FreeBSD.org>
Cc: freebsd-net@FreeBSD.org
Subject: Re: vlan panics?
References: <20010215061533.A68002@hub.freebsd.org>
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Adrian Chadd wrote:
> 
> Hi,
> 
> I'm using the vlan code in FreeBSD-stable.
> 
> I've discovered that on the fxp, if I ifconfig a vlan up without
> ifconfig'ing the parent interface (fxp) up, I'll get a panic.
> I don't have the bt handy at the moment but basically the codepath
> is bringing the vlan interface up, sending the gratuituous(sp)? arp
> request out the vlan interface, which sends it out the parent interface.
> The fxp code doesn't check whether the interface has been initialised
> when it attempts to queue a packet for outbound, and you get a panic.
> 
> When I try the same thing on a machine with a tl interface it works
> fine.
> 
> Now, I can hear people shouting "fix the fxp driver!", but I'm not
> sure that is the right solution. (However I do believe the fxp
> driver should have a check in there in any case.)
> 
> I believe that if a vlan interface is attached to a device and configured
> up the device itself should also be configured up. This way the initial
> gratuituous(sp?) arp request will make it on to the wire.

there's an fxp-Vlan patch floating around somewhere.

> 
> Opinions?
> 
> Thanks!
> 
> Adrian
> 
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-- 
      __--_|\  Julian Elischer
     /       \ julian@elischer.org
    (   OZ    ) World tour 2000-2001
---> X_.---._/  
            v


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