netdev - Re: [PATCH net-next 5/5] vxlan: implement GPE in L3 mode

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Date:	Sat, 27 Feb 2016 20:26:09 +0100
From:	Jiri Benc <jbenc@...hat.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	Jesse Gross <jesse@...nel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 5/5] vxlan: implement GPE in L3 mode

On Fri, 26 Feb 2016 15:42:29 -0800, Tom Herbert wrote:
> Agreed, and I don't see why there even needs to be modes. VXLAN-GPE
> can carry arbitrary protocols with a next-header field. For Ethernet,
> MPLS, IPv4, and IPv6 it should just be a simple mapping of the next
> header to Ethertype for purposes of processing the payload.

That's exactly what this patchset does, Tom. The mapping is done in
vxlan_parse_gpe_hdr and vxlan_build_gpe_hdr.

Ethernet is special, though. It needs to be a standalone mode,
otherwise frames encapsulated including an Ethernet header wouldn't be
processed and there would be no way to send such packets - the only
distinction the driver can use is skb->protocol and that won't become
ETH_P_TEB magically.

 Jiri