IXGBE_VFTA
bits = IXGBE_READ_REG(hw, IXGBE_VFTA(regindex));
IXGBE_WRITE_REG(hw, IXGBE_VFTA(regindex), bits);
IXGBE_WRITE_REG(hw, IXGBE_VFTA(offset), 0);
vfta = IXGBE_READ_REG(hw, IXGBE_VFTA(regidx));
IXGBE_WRITE_REG(hw, IXGBE_VFTA(regidx), vfta);
IXGBE_WRITE_REG(hw, IXGBE_VFTA(vlan / 32), vfta);
IXGBE_WRITE_REG(hw, IXGBE_VFTA(offset), 0);
uint32_t off = IXGBE_VFTA(0);