netdev - Re: [PATCH net] nfp: flower: remove headroom from max MTU calculation

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Message-Id: <20180510.152827.2297604674993831939.davem@davemloft.net>
Date:   Thu, 10 May 2018 15:28:27 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jakub.kicinski@...ronome.com
Cc:     oss-drivers@...ronome.com, netdev@...r.kernel.org,
        pieter.jansenvanvuuren@...ronome.com
Subject: Re: [PATCH net] nfp: flower: remove headroom from max MTU
 calculation

From: Jakub Kicinski <jakub.kicinski@...ronome.com>
Date: Wed,  9 May 2018 00:18:58 -0700

> From: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> 
> Since commit 29a5dcae2790 ("nfp: flower: offload phys port MTU change") we
> take encapsulation headroom into account when calculating the max allowed
> MTU.  This is unnecessary as the max MTU advertised by firmware should have
> already accounted for encap headroom.
> 
> Subtracting headroom twice brings the max MTU below what's necessary for
> some deployments.
> 
> Fixes: 29a5dcae2790 ("nfp: flower: offload phys port MTU change")
> Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> Reviewed-by: John Hurley <john.hurley@...ronome.com>
> Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Applied.