Commit e94cd811 authored Sep 22, 2017 by Zhang Shengju Committed by David S. Miller Sep 25, 2017

net: remove MTU limits for dummy and ifb device



These two drivers (dummy and ifb) call ether_setup(), after commit
61e84623 ("net: centralize net_device min/max MTU checking"), the
range of mtu is [min_mtu, max_mtu], which is [68, 1500] by default.

These two devices should not have limits on MTU. This patch set their
min_mtu/max_mtu to 0. So that dev_set_mtu() will not check the mtu range,
and can be set with any value.

CC: Eric Dumazet <edumazet@google.com>
CC: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 1b17ca04

drivers/net/dummy.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -353,7 +353,7 @@ static void dummy_setup(struct net_device *dev)
		eth_hw_addr_random(dev);

		dev->min_mtu = 0;
		dev->max_mtu = ETH_MAX_MTU;
		dev->max_mtu = 0;
		}

		static int dummy_validate(struct nlattr tb[], struct nlattr data[],

drivers/net/ifb.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -231,6 +231,9 @@ static void ifb_setup(struct net_device *dev)
		eth_hw_addr_random(dev);
		dev->needs_free_netdev = true;
		dev->priv_destructor = ifb_dev_free;

		dev->min_mtu = 0;
		dev->max_mtu = 0;
		}

		static netdev_tx_t ifb_xmit(struct sk_buff skb, struct net_device dev)

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