OTX2_HW_TIMESTAMP_LEN
maxlen = pfvf->hw.max_mtu + OTX2_ETH_HLEN + OTX2_HW_TIMESTAMP_LEN;
req->maxlen = mtu + OTX2_ETH_HLEN + OTX2_HW_TIMESTAMP_LEN;
frame_size = mtu + OTX2_ETH_HLEN + OTX2_HW_TIMESTAMP_LEN;
off = OTX2_HW_TIMESTAMP_LEN;