We have lost a comment for minimum mtu value set for netdevice with
'commit 
d894be57ca92 ("ethernet: use net core MTU range checking in
more drivers"). Updating it accordingly.
Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
                netdev->priv_flags |= IFF_UNICAST_FLT;
 
                /* MTU range: 81 - 9600 */
-               netdev->min_mtu = 81;
+               netdev->min_mtu = 81;              /* accommodate SACK */
                netdev->max_mtu = MAX_MTU;
 
                netdev->netdev_ops = &cxgb4_netdev_ops;