IXGBE_VFTDT
IXGBE_WRITE_REG(&sc->hw, IXGBE_VFTDT(j), 0);
txr->tail = IXGBE_VFTDT(j);
txr->tail = IXGBE_VFTDT(txr->me);
IXGBE_WRITE_REG(hw, IXGBE_VFTDT(i), 0);