netdev - Re: [PATCH net-next] vxlan: fix handling of the inner 8021Q tagged frame

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Date:	Tue, 01 Apr 2014 18:25:17 +0900
From:	Atzm Watanabe <atzm@...atosphere.co.jp>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] vxlan: fix handling of the inner 8021Q tagged frame

Hi Stephen,

At Mon, 31 Mar 2014 17:46:56 -0700,
Stephen Hemminger wrote:
> 
> On Mon, 31 Mar 2014 15:56:09 +0900
> Atzm Watanabe <atzm@...atosphere.co.jp> wrote:
> 
> > +	ether_addr_copy(key.eth_addr, eth_hdr(skb)->h_source);
> > +	if (ntohs(eth_hdr(skb)->h_proto) == ETH_P_8021Q)
> > +		key.vlan_id = ntohs(vlan_eth_hdr(skb)->h_vlan_TCI) & VLAN_VID_MASK;
> > +	else
> > +		key.vlan_id = 0;
> > +
> 
> What about QinQ vlan's?

This patch supports only single tagged frame currently.
But, indeed, key.vlan_id will be set to 0 even when
receiving the Q-in-Q double tagged frame...

So I'll send a patch v2 that will learn a topmost VID
when receiving ETH_P_8021AD frame.

If it must learn all nested VIDs, firstly we should design
the handling of Q-in-Q nested VIDs on the "bridge" command,
IMHO.

Thank you.
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