net: remove MTU limits for dummy and ifb device

These two drivers (dummy and ifb) call 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.

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>

2 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c
index e31ab3b94c6f..58483af80bdb 100644
--- a/drivers/net/dummy.c
+++ b/drivers/net/dummy.c
@@ -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[],
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index 8870bd2a2e8a..0008da7e9d4c 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -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)