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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Haishuang Yan <yanhaishuang@cmss.chinamobile.com>,
        William Tu <u9012063@gmail.com>,
        Jakub Kicinski <jakub.kicinski@netronome.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 592/639] ip6erspan: remove the incorrect mtu limit for ip6erspan
Date:   Fri, 24 Jan 2020 10:32:42 +0100
Message-Id: <20200124093203.573201729@linuxfoundation.org>
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From: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>

[ Upstream commit 4123f637a5129470ff9d3cb00a5a4e213f2e15cc ]

ip6erspan driver calls ether_setup(), after commit 61e84623ace3
("net: centralize net_device min/max MTU checking"), the range
of mtu is [min_mtu, max_mtu], which is [68, 1500] by default.

It causes the dev mtu of the erspan device to not be greater
than 1500, this limit value is not correct for ip6erspan tap
device.

Fixes: 61e84623ace3 ("net: centralize net_device min/max MTU checking")
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/ipv6/ip6_gre.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index b3515a4f13039..1f2d0022ba6fd 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -2218,6 +2218,7 @@ static void ip6erspan_tap_setup(struct net_device *dev)
 {
 	ether_setup(dev);
 
+	dev->max_mtu = 0;
 	dev->netdev_ops = &ip6erspan_netdev_ops;
 	dev->needs_free_netdev = true;
 	dev->priv_destructor = ip6gre_dev_free;
-- 
2.20.1