IBMVETH_BUFF_OH
int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
int mtu = netdev->mtu + IBMVETH_BUFF_OH;
if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
len = adapter->netdev->mtu + IBMVETH_BUFF_OH;