netdev - Re: [PATCH,RFC] skb->network_header and __vlan_put

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Message-ID:  <m3prqgpe1e.fsf@ursa.amorsen.dk>
Date:	Tue, 17 Jun 2008 12:10:53 +0200
From:	Benny Amorsen <benny+usenet@...rsen.dk>
To:	netdev@...r.kernel.org
Subject:  Re: [PATCH,RFC] skb->network_header and __vlan_put_tag()

Lennert Buytenhek <buytenh@...tstofly.org> writes:

> I'm adding VLAN support to mv643xx_eth (which does not support HW
> insertion of a VLAN tag, but it does support HW checksumming when
> a VLAN tag is present, you just have to tell the HW how many bytes
> there are between the start of the packet and the IP header), and
> I'm ending up with code like this:
>
> 	if (skb->protocol == htons(ETH_P_8021Q))
> 		ip_header = ip_hdr(skb) + 4;
> 	else
> 		ip_header = ip_hdr(skb);

How well does this work when doing QinQ or QinQinQ?


/Benny


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