IXGBE_QBTC
IXGBE_EVC_REGADD(hw, stats, IXGBE_QBTC(i), qbtc[i]);
IXGBE_READ_REG(hw, IXGBE_QBTC(i));
stats->qbtc[tc] += IXGBE_READ_REG(hw, IXGBE_QBTC(tc));