OpenWrt support for Asus RT-AX53U

Hi,

@marceli : never run iperf3 on the router itself, you can do that if your router is a a powerful x86_64
but on all socs the result of doing this is something like:

[SUM]   0.00-10.00  sec   621 MBytes   521 Mbits/sec                  sender
[SUM]   0.00-10.00  sec   613 MBytes   514 Mbits/sec                  receiver

because:

For information:
There is a new patch on the snapshots about routing perf between lan and wan:

To summerize:
before: slow routing lan <-> wan but fast switching (use case: dumb AP with wan included in br-lan)
now: near gb routing lan <-> wan but switching between lan and wan is now slower

So take care on how you plug your ethernet wires

As a exemple, with today's snapshot and switching only (br-lan including the 4 ifaces and no wan+wan6):
You need to reboot the router after each fw conf change, I don't know why but it seams that FW changes now need a reboot to work

  1. uplink on WAN and no offloading (with or sw offloading, no hw offloading):
iperf3.exe -c 192.168.0.2 -bidir -P8
[SUM]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec                  sender
[SUM]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec                  receiver
  1. uplink on WAN with hw offloading, lower perf:
iperf3.exe -c 192.168.0.2 -bidir -P8
[SUM]   0.00-10.00  sec  1.04 GBytes   896 Mbits/sec                  sender
[SUM]   0.00-10.00  sec  1.04 GBytes   895 Mbits/sec                  receiver

Now in router mode doing nat (I made a reset and let all the defaults):

  1. uplink on WAN and no offloading (with or sw offloading, no hw offloading):
iperf3.exe -c 192.168.0.2 -bidir -P8
[SUM]   0.00-10.00  sec  1.08 GBytes   925 Mbits/sec                  sender
[SUM]   0.00-10.00  sec  1.08 GBytes   925 Mbits/sec                  receiver

To be honest, that is a little better (933 Mbits/sec) with SW offloading

  1. uplink on WAN with hw offloading, better perf than before:
iperf3.exe -c 192.168.0.2 -bidir -P8
[SUM]   0.00-10.00  sec  1.09 GBytes   939 Mbits/sec                  sender
[SUM]   0.00-10.00  sec  1.09 GBytes   938 Mbits/sec                  receiver

Results are better than with my other MT7621 device (Cudy WR1300) as you can read here:

Perhaps they are working on this patch (I have a today's snapshot on the Asus), perhaps the ax53u is a little bit more powerfull (and as I have Wifi off for this test there is more CPU available for routing)