[Bug 292759] [igb] vlanhwfilter silently does not work with bridge with VLANs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292759

--- Comment #10 from vova@zote.me ---
(In reply to Zhenlei Huang from comment #7)

> Well if_bridge(4) does not register vlan_config event, hence unable to pass 
> correct VLAN IDs to the bridge members those has IFCAP_VLAN_HWFILTER enabled. 
> Disabling the IFCAP_VLAN_HWFILTER capability of member interface can be a rescue, 
> since it makes the member interface into *promiscuous* mode for tagged packets.

hm ... in face after any reconfiguration - if_bridge knows set of VLANs for
each member port:


# ifconfig bridge0
bridge0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric
0 mtu 1504
        description: igb0
        options=10<VLAN_HWTAGGING>
        ether 58:9c:fc:10:3f:e4
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        bridge flags=1<VLANFILTER>
        member: epair3a flags=943<LEARNING,DISCOVER,PRIVATE,AUTOEDGE,AUTOPTP>
                port 16 priority 128 path cost 2000 vlan protocol 802.1q
untagged 20 tagged 1
        member: epair1a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 9 priority 128 path cost 2000 vlan protocol 802.1q
untagged 1
        member: epair2a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 12 priority 128 path cost 2000 vlan protocol 802.1q
untagged 20
        member: igb0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 1 priority 128 path cost 55 vlan protocol 802.1q untagged
1 tagged 20
        groups: bridge
        nd6 options=9<PERFORMNUD,IFDISABLED>

The only "issue" here is who calling whom and when?

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