TX_TS_FLAG_TIMESTAMPING_ENABLED
tx->ts_flags |= TX_TS_FLAG_TIMESTAMPING_ENABLED;
tx->ts_flags &= ~TX_TS_FLAG_TIMESTAMPING_ENABLED;
(tx->ts_flags & TX_TS_FLAG_TIMESTAMPING_ENABLED) &&
else if (tx->ts_flags & TX_TS_FLAG_TIMESTAMPING_ENABLED)