netdev - Re: [PATCH net v2 2/3] geneve: Relax MTU constraints

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Message-ID: <86a8n86bcs.fsf@weave.works>
Date:	Wed, 10 Feb 2016 11:41:55 +0000
From:	David Wragg <david@...ve.works>
To:	Tom Herbert <tom@...bertland.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	dev@...nvswitch.org, Jesse Gross <jesse@...nel.org>,
	David Miller <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Thomas Graf <tgraf@...g.ch>,
	Roopa Prabhu <roopa@...ulusnetworks.com>
Subject: Re: [PATCH net v2 2/3] geneve: Relax MTU constraints

Tom Herbert <tom@...bertland.com> writes:
> The correct thing to do is determine the maximum amount of
> encapsulation overhead that can ever be set in a packet and use for
> setting the MTU. For instance, when RCO is enable in GUE, the size of
> the option is included in tunnel->encap_hlen even though it will not
> be used in all packets (via ip_tunnel_change_mtu). If there is no way
> to determine a maximum overhead a priori from configuration, then
> maximum overhead could be assumed to be maximum possible encapsulation
> header size which for Geneve is 132 bytes IIRC.

Ok, I'll come up with a patch to address this.

David