From: David Wragg <david@weave•works>
To: Tom Herbert <tom@herbertland•com>
Cc: Linux Kernel Network Developers <netdev@vger•kernel.org>,
dev@openvswitch•org, Jesse Gross <jesse@kernel•org>,
David Miller <davem@davemloft•net>,
Hannes Frederic Sowa <hannes@stressinduktion•org>,
Thomas Graf <tgraf@suug•ch>,
Roopa Prabhu <roopa@cumulusnetworks•com>
Subject: Re: [PATCH net v2 2/3] geneve: Relax MTU constraints
Date: Wed, 10 Feb 2016 11:41:55 +0000 [thread overview]
Message-ID: <86a8n86bcs.fsf@weave.works> (raw)
In-Reply-To: <CALx6S37sD+MNK+kp9oLnEYHEUkOy_NdQK6bq-aMQP2Mvw9M4Qg@mail.gmail.com> (Tom Herbert's message of "Wed, 10 Feb 2016 08:40:55 +0100")
Tom Herbert <tom@herbertland•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
next prev parent reply other threads:[~2016-02-10 11:41 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-09 16:47 [PATCH net v2 0/3] Set a large MTU on ovs-created tunnel devices David Wragg
2016-02-09 16:47 ` [PATCH net v2 1/3] vxlan: Relax the MTU constraints David Wragg
[not found] ` <1455036424-6403-1-git-send-email-david-1SEAoVOfG6VEzL6FDj/jAg@public.gmane.org>
2016-02-09 16:47 ` [PATCH net v2 2/3] geneve: Relax " David Wragg
2016-02-09 18:18 ` Sergei Shtylyov
[not found] ` <56BA2D6D.6090408-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2016-02-09 18:22 ` David Wragg
2016-02-10 7:40 ` Tom Herbert
2016-02-10 11:41 ` David Wragg [this message]
2016-02-10 11:59 ` Jesse Gross
2016-02-10 14:21 ` Tom Herbert
[not found] ` <CALx6S36kvXJUZM8_vEmF8L3bxnRiBh98Rs0wAd-HGBJ9Yyde_Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-10 14:52 ` Jesse Gross
2016-02-16 12:33 ` David Wragg
2016-02-16 16:44 ` Tom Herbert
2016-02-18 16:54 ` David Wragg
2016-02-18 20:07 ` David Miller
[not found] ` <86bn7e2c3t.fsf-1SEAoVOfG6VEzL6FDj/jAg@public.gmane.org>
2016-02-19 2:11 ` Tom Herbert
2016-02-09 16:47 ` [PATCH net v2 3/3] vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices David Wragg
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