net: vrf: remove MTU limits for vrf device

This change “net: vrf: remove MTU limits for vrf device” in Linux kernel is authored by Hangbin Liu <liuhangbin [at]> on Mon Feb 18 17:14:25 2019 +0800.

net: vrf: remove MTU limits for vrf device

Similiar to commit e94cd8113ce63 ("net: remove MTU limits for dummy and
ifb device"), MTU is irrelevant for VRF device. We init it as 64K while
limit it to [68, 1500] may make users feel confused.

Reported-by: Jianlin Shi <>
Signed-off-by: Hangbin Liu <>
Reviewed-by: David Ahern <>
Signed-off-by: David S. Miller <>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit ad49bc6.

There are 3 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/net/vrf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 95909e2..7c1430e 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -1273,6 +1273,9 @@ static void vrf_setup(struct net_device *dev)
 	/* default to no qdisc; user can add if desired */
 	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->min_mtu = 0;
+	dev->max_mtu = 0;
 static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],

The commit for this change in Linux stable tree is ad49bc6 (patch).

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