From: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>
Date: Fri, 27 Sep 2019 14:58:20 +0800
> erspan 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 ipgre tap device.
>
> Tested:
> Before patch:
> # ip link set erspan0 mtu 1600
> Error: mtu greater than device maximum.
> After patch:
> # ip link set erspan0 mtu 1600
> # ip -d link show erspan0
> 21: erspan0@NONE: <BROADCAST,MULTICAST> mtu 1600 qdisc noop state DOWN
> mode DEFAULT group default qlen 1000
> link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu
> 68 maxmtu 0
>
> Fixes: 61e84623ace3 ("net: centralize net_device min/max MTU checking")
> Signed-off-by: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>
Applied and queued up for -stable.
