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

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Date:	Fri, 26 Feb 2016 15:42:29 -0800
From:	Tom Herbert <tom@...bertland.com>
To:	Jesse Gross <jesse@...nel.org>
Cc:	Jiri Benc <jbenc@...hat.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 5/5] vxlan: implement GPE in L3 mode

On Fri, Feb 26, 2016 at 2:22 PM, Jesse Gross <jesse@...nel.org> wrote:
> On Thu, Feb 25, 2016 at 11:48 PM, Jiri Benc <jbenc@...hat.com> wrote:
>> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
>> index c2b2b7462731..ee4f7198aa21 100644
>> --- a/include/uapi/linux/if_link.h
>> +++ b/include/uapi/linux/if_link.h
>> @@ -464,6 +464,7 @@ enum {
>>  enum vxlan_gpe_mode {
>>         VXLAN_GPE_MODE_DISABLED = 0,
>>         VXLAN_GPE_MODE_L2,
>> +       VXLAN_GPE_MODE_L3,
>
> Given that VXLAN_GPE_MODE_L3 will eventually come to be used by NSH,
> MPLS, etc. in addition to IPv4/v6, most of which are not really L3, it
> seems like something along the lines of NO_ARP might be better since
> that's what it really indicates. Once that is in, I don't really see
> the need to explicitly block Ethernet packets from being handled in
> this mode. If they are received, then they can just be handed off to
> the stack - at that point it would look like an extra header, the same
> as if an NSH packet is received.

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.