rework termination mac handling

[KanjiMonster]

Rework termination mac handling by tying termination mac entries to interfaces:

• create entries on interface creation
• remove them on interface deletion

with the values of

• port_id, vid 0 for the base port/bond interface (specific port, any vlan)
• port_id, vid for vlan interfaces on top of those (specific port, specific vlan)
• port_id 0, vid 0 for the base bridge interface (any port, any vlan)
• port_id 0, vid for vlan interface on top of bridge (any port, specific vlan)

Since these combinations are unique, we can just add/remove the entries without the need of having refcounts.

Advantages:

• simplication of code
• ip addresses assigned to lo will just work

Disadvantages:

• higher use of termination mac flows, which are limited (0.5k to 1k), so only (256 - ports) to (512 - ports) number of vlan/bridge/bond interfaces are supported
• (this is a lie though, since both termination mac entries for an interface share the same underlying resource)

Open Questions:

• Do other parts need termination mac entries, or the underlying resources?

Signed-off-by: Jonas Gorski [email protected]