kernel: remove mvsw61xx swconfig driver

[Georgi Valkov]

Dear DENG Qingfang,

Can you please take a moment to discuss the switch from mvsw61xx swconfig driver to DSA?
While I like the simplicity of having lan1 lan2 lan3 lan4 wan interfaces for each port, there are a few important issues that remain to be addressed:
1. Since the new DSA does not support swconfig, it is no longer possible to use port mirroring.
2. WRT3200ACM has two Ethernet interfaces. Isn’t it more efficient to have dedicated interfaces for LAN and WAN compared to the DSA model which uses only one of them, and creates multiple interfaces using VLANs?

Would it be possible to enable the missing functionality in DSA? 1 is very important to me. If not, then would it be possible to have a menuconfig setting, so users can choose whether they want DSA or prefer swconfig? In my fork of OpenWRT I keep a commit that restores the swconfig mode for WRT3200ACM. Everything works correctly and the interfaces are named lan wan.

--
Georgi Valkov
github.com/httpstorm/
httpstorm.com