BPI-R3 or BPI-R4 PPPoE hardware offload

Can either the R3 or R4 route line rate 2.5Gbps using PPPoE? I know there’s hardware support for NAT, but PPPoE adds additional overhead that I want to make sure the board can handle.

Does anyone have benchmarks?

I see that the Packet Switch Engine of the MT7986A Filogic 830 (R3) supports “PPPoE header insertion”, but I’m not sure what speed that will guarantee and I couldn’t find a similar document for the 880.

Also, I don’t see the R4 on the SINOVOIP or Bipai shop - is it not currently availaboe for purchase?

Thanks