IPQ40xx Switch Config "Strangeness" (swconfig)

For Developers
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The same device is used on the Compex WPJ428,

is the device using double VLAN tags ? ( tagged VLAN 1 and 2 from devicetree )
There is only 1 switch ( QCA8072 ) that has ports 4 and 5 connected to the external RJ45 sockets, so the LuCi switch web config doesn't always work on this system :

I have to set it in /etc/config/network and specify eth1.x or eth0.x even tho they are both on the same switch- makes it look like they are on separate switches ( or the same switch with 2 gmac / mdio busses ) .. strange indeed

I've gotten VLANs to work with it by manually adding the switch configs to /etc/config/network : ( part of a mwan3 config we were doing - the compex only has 2 physical ports on the board so I extended the ports via a managed switch)

config switch
   option name 'switch0'
   option reset '1'
   option enable_vlan '1'

config switch_vlan 'eth1_11'
   option device 'switch0'
   option vlan '11'
   option vid '11'
  option ports '0t 4t 5t'

config switch_vlan 'eth1_12'
   option device 'switch0'
   option vlan '12'
   option vid '12'
   option ports '0t 4t 5t'

config switch_vlan 'eth0_15'
   option device 'switch0'
   option vlan '15'
   option vid '15'
   option ports '0t 4t 5t'

from the devicetree it looks like vlan tags are set for "wan" and "lan"

&gmac0 {
	qcom,phy_mdio_addr = <4>;
	qcom,poll_required = <1>;
	qcom,forced_speed = <1000>;
	qcom,forced_duplex = <1>;
	vlan_tag = <2 0x20>;
};

&gmac1 {
	qcom,phy_mdio_addr = <3>;
	qcom,poll_required = <1>;
	qcom,forced_speed = <1000>;
	qcom,forced_duplex = <1>;
	vlan_tag = <1 0x10>;
};

but in 02_network its called"eth0 and eth1"

compex,wpj428
	ucidef_set_interface_lan "eth0 eth1"