[Bug 246108] ue0 (ASIX Elec. Corp. AX88178) does not capture packets in promisc mode w/o IP address assigned

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246108

            Bug ID: 246108
           Summary: ue0 (ASIX Elec. Corp. AX88178) does not capture
                    packets in promisc mode w/o IP address assigned
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: emaste at freebsd.org

>From dmesg:

ugen0.7: <ASIX Elec. Corp. AX88178> at usbus0
axe0 on uhub2
axe0: <0> on usbus0
miibus0: <MII bus> on axe0
rgephy0: <RTL8169S/8110S/8211 1000BASE-T media interface> PHY 1 on miibus0
rgephy0:  none, 10baseT, 10baseT-FDX, 10baseT-FDX-flow, 100baseTX,
100baseTX-FDX, 100baseTX-FDX-flow, 1000baseT, 1000baseT-master, 1000baseT-FDX,
1000baseT-FDX-master, 1000baseT-FDX-flow, 1000baseT-FDX-flow-master, auto,
auto-flow
ue0: <USB Ethernet> on axe0
ue0: Ethernet address: ##:##:##:##:##:##
ue0: link state changed to DOWN

The USB-Ethernet interface is connected to a source (HDMI-IP extender) that is
continuously generating packets. Bring interface up:

# ifconfig ue0 up; ifconfig ue0
ue0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=80008<VLAN_MTU,LINKSTATE>
        ether 00:50:b6:1a:15:80
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

Attempt to capture traffic for a few seconds, observe no packets received:

# tcpdump -ni ue0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ue0, link-type EN10MB (Ethernet), capture size 262144 bytes
^C
0 packets captured
0 packets received by filter
0 packets dropped by kernel

Assign an address:

# ifconfig ue0 10.0.0.1/24

Observe packets received by tcpdump:

# tcpdump -ni ue0 -c 5
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ue0, link-type EN10MB (Ethernet), capture size 262144 bytes
17:31:03.055453 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
17:31:03.056452 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
17:31:03.057453 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
17:31:03.058499 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
17:31:03.059483 IP 192.168.1.238.5004 > 239.255.42.42.5004: UDP, length 0
5 packets captured
5 packets received by filter
0 packets dropped by kernel

amd64 on Lenovo X1 Carbon 7th gen, r360105+a579cace6430-c268079

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