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    Subject[PATCH 4.19 592/639] ip6erspan: remove the incorrect mtu limit for ip6erspan
    Date
    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


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