netdev - Re: [PATCH] vlan_dev: VLAN 0 should be treated as "no vlan tag" (802.1p packet)

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Date:	Wed, 16 Jun 2010 16:24:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pedro Garcia <pedro.netdev@...devamos.com>
Cc:	netdev@...r.kernel.org, Ben Hutchings <bhutchings@...arflare.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] vlan_dev: VLAN 0 should be treated as "no vlan tag"
 (802.1p packet)

Le mercredi 16 juin 2010 à 15:28 +0200, Pedro Garcia a écrit :

> 
> In my understanding, 802.1p is a "subset" of 802.1q, and they share the 
> protocol number. We can do a 802.1p module, but in the end it will end
> up reusing most of the code in 802.1q.
> 

I was more thinking of a default ETH_P_8021Q rx handler (aka
vlan_skb_recv_minimal) with minimum handling (only accept vid=0 frames),
being overridden by real 8021q handler if module loaded/present.

> In any case defining a VLAN 0 ends up usually in problems with which table 
> the ARP entries get stored in. This patch solves the problem to whom 
> is not using VLAN 0 explicitly, but if somebody is using VLAN 0 tagging
> it will work (whatever "work" means) as before.
> 
> Probably a definitive fix would be not to allow the definition of VLAN 0 
> in 802.1q module and provide some other way to tag priority packets without
> using a subinterface (maybe in the same module or a new 8021p one). I am 
> having a look at the kernel to see what happens if we load two modules for 
> the same protocol. 
> 
> By the way, the changelog I have to write is just the text before the 
> patch?

Yes, you can take a look on any patch around for examples, like...

git show 6e327c11a91d190650df9aabe7d3694d4838bfa1

Check Documentation/SubmittingPatches   section 2)



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