netdev - Re: [PATCH net] ip_tunnel: don't force DF when MTU is locked

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Date:   Sat, 17 Nov 2018 21:51:40 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     sd@...asysnail.net
Cc:     netdev@...r.kernel.org, sbrivio@...hat.com
Subject: Re: [PATCH net] ip_tunnel: don't force DF when MTU is locked

From: Sabrina Dubroca <sd@...asysnail.net>
Date: Fri, 16 Nov 2018 16:58:19 +0100

> The various types of tunnels running over IPv4 can ask to set the DF
> bit to do PMTU discovery. However, PMTU discovery is subject to the
> threshold set by the net.ipv4.route.min_pmtu sysctl, and is also
> disabled on routes with "mtu lock". In those cases, we shouldn't set
> the DF bit.
> 
> This patch makes setting the DF bit conditional on the route's MTU
> locking state.
> 
> This issue seems to be older than git history.
> 
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
> Reviewed-by: Stefano Brivio <sbrivio@...hat.com>

Applied and queued up for -stable.