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Message-Id: <20160524.143417.15421952212090108.davem@davemloft.net> Date: Tue, 24 May 2016 14:34:17 -0700 (PDT) From: David Miller <davem@...emloft.net> To: yanhaishuang@...s.chinamobile.com Cc: kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 1/2] ip6_gre: Fix MTU setting for ip6gretap From: Haishuang Yan <yanhaishuang@...s.chinamobile.com> Date: Sat, 21 May 2016 18:17:34 +0800 > When creat an ip6gretap interface with an unreachable route, > the MTU is about 14 bytes larger than what was needed. ... > Because rt is not NULL here, so dev->mtu will subtract the ethernet > header length later. But when rt is NULL, it just simply return, so > dev->mtu doesn't update correctly in this situation. > > This patch first verify the dev->type is ARPHRD_ETHER for ip6gretap > interface, and then decrease the mtu as early as possible. > > Signed-off-by: Haishuang Yan <yanhaishuang@...s.chinamobile.com> Applied.
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