[PATCH net-next] hyperv: Add processing of MTU reduced by the host

[David Miller]

From: Haiyang Zhang <haiyangz at microsoft.com>
Date: Tue, 11 Nov 2014 15:27:52 -0800

> -	if (mtu < 68 || mtu > limit)
> +	if (mtu < ETH_DATA_LEN || mtu > limit)
>  		return -EINVAL;

This is not correct.

The test is against the minimally supported MTU, which should
be 68 not ETH_DATA_LEN which is 1500.