IB/ipoib: Ensure that MTU isn't less than minimum permitted

It is illegal to change MTU to a value lower than the minimum MTU
stated in ethernet spec. In addition to that we need to add 4 bytes
for encapsulation header (IPOIB_ENCAP_LEN).

Before "ifconfig ib0 mtu 0" command, succeeds while it obviously shouldn't.

Signed-off-by: Muhammad Sammar <muhammads@mellanox.com>
Reviewed-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index e3d28f9..2d20de7 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -243,7 +243,8 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
                return 0;
        }
 
-       if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
+       if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
+           new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
                return -EINVAL;
 
        priv->admin_mtu = new_mtu;