From e94cd8113ce63bca34040aae52d0603baf6ec07c Mon Sep 17 00:00:00 2001 From: Zhang Shengju Date: Fri, 22 Sep 2017 23:57:49 +0800 Subject: [PATCH] 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 CC: Sabrina Dubroca Signed-off-by: Zhang Shengju Signed-off-by: David S. Miller --- drivers/net/dummy.c | 2 +- drivers/net/ifb.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) 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) -- 2.30.2