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net: remove MTU limits for dummy and ifb device

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These two drivers (dummy and ifb) call ether_setup(), after commit
61e84623ac ("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>
This commit is contained in:
Zhang Shengju 2017-09-22 23:57:49 +08:00 • committed by David S. Miller
parent 1b17ca044a
commit e94cd8113c
2 changed files with 4 additions and 1 deletions
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2
drivers/net/dummy.c
View file

@ -353,7 +353,7 @@ static void dummy_setup(struct net_device *dev)
eth_hw_addr_random(dev); eth_hw_addr_random(dev);
dev->min_mtu = 0; dev->min_mtu = 0;
dev->max_mtu = ETH_MAX_MTU; dev->max_mtu = 0;
} }
static int dummy_validate(struct nlattr *tb[], struct nlattr *data[], static int dummy_validate(struct nlattr *tb[], struct nlattr *data[],

3
drivers/net/ifb.c
View file

@ -231,6 +231,9 @@ static void ifb_setup(struct net_device *dev)
eth_hw_addr_random(dev); eth_hw_addr_random(dev);
dev->needs_free_netdev = true; dev->needs_free_netdev = true;
dev->priv_destructor = ifb_dev_free; 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) static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)