[Bug 230996] em/igb: Intel i210/i350: ifconfig: enabling "vlanhwtag" renders VLAN on i210/i350 NICs unusable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230996

--- Comment #7 from Jason Tubnor <jason at tubnor.net> ---
FreeBSD myhostname 13.0-CURRENT FreeBSD 13.0-CURRENT #0 r356528: Thu Jan  9
04:56:46 UTC 2020    
root at releng1.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64

See attachment for full dmesg

igb2: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
       
options=4e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6,NOMAP>
        ether ac:1f:6b:71:aa:dd
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

vlan1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
        options=4200401<RXCSUM,LRO,RXCSUM_IPV6,NOMAP>
        ether ac:1f:6b:71:aa:dd
        inet6 fe80::ae1f:6bff:fe71:aadd%vlan1 prefixlen 64 tentative scopeid
0x6
        inet 10.1.1.10 netmask 0xffffff00 broadcast 10.1.1.255
        groups: vlan
        vlan: 1 vlanpcp: 0 parent interface: igb2
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

vm-vlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 8a:3c:0f:b9:aa:bb
        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
        member: tap0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 11 priority 128 path cost 2000000
        member: vlan1 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 6 priority 128 path cost 20000
        groups: bridge vm-switch viid-05c3b@
        nd6 options=1<PERFORMNUD>

tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
        description: vmnet-guest-0-vlan1
        options=80000<LINKSTATE>
        ether 58:9c:fc:10:ff:aa
        inet6 fe80::5a9c:fcff:fe10:ffaa%tap0 prefixlen 64 tentative scopeid 0xb
        groups: tap vm-port
        media: Ethernet autoselect
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        Opened by PID 10095


- Additional details:

  - only rx
  - when vlan interface is bridged to a tap and performing test between bhyve
guest and physical computer on the same subnet external from the host

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