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

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

--- Comment #7 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Aleksandr Fedorov from comment #5)

The report by vova,

now fix that:
# ifconfig igb1 -vlanhwfilter
# ping -c1 192.168.20.1
PING 192.168.20.1 (192.168.20.1): 56 data bytes
64 bytes from 192.168.20.1: icmp_seq=0 ttl=64 time=0.473 ms

--- 192.168.20.1 ping statistics ---
1 packets transmitted, 1 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.473/0.473/0.473/0.000 ms

>>> now it works 

drive me to think about the implementation of vlan over if_bridge(4).

Currently on configuring the vid ( VLAN ID ), the vlan_config event handler is
invoked to let the drivers, obviously has the IFCAP_VLAN_HWFILTER capability,
to program hardware / firmware's vlan filters. The mismatched tagged packets
will all be silently dropped by the hardware.

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.

I'm CCing Lexi to see if she's working on that.

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