RK3588 TCP stuck at wscale:6

[DylanTX]

Using RK3588 (Rock 5B+) on kernels 5.10, 6.1, and 6.12.

TCP window scale is always wscale:6 even with net.core.rmem_max=134217728 configured.

$ ss -tin
wscale:6,12 rcv_space:14480

Should be wscale:10+ with larger rcv_space based on the 128MB buffer config.

tested with both C and .NET - same result. Kills performance for high-bandwidth streaming.

Known issue? Any fix available?

Thanks in advance!