main [so: 15] context, 7950X3D and RTL8251/8153 based Ethernet dongle: loss of state, example log information

The following sort of thing is happening a lot:

Ryzen 9 7950X3D using a USB Ethernet dongle that I've historically
used on occasion, sometimes for long periods . . .

Example contexts for the issue have been:

FreeBSD 15.0-CURRENT #126 main-n266130-d521abdff236-dirty: Tue Oct 24 18:17:40 PDT 2023
and:
FreeBSD 15.0-CURRENT #131 main-n266749-ed31b3f4a146-dirty: Wed Nov 29 16:53:33 PST 2023

Both UFS and ZFS boot media, here part of a ed31b3f4a146 UFS example is shown

Nov 29 18:26:27 7950X3D-UFS kernel: miibus0: <MII bus> on ure0
Nov 29 18:26:27 7950X3D-UFS kernel: rgephy0: <RTL8251/8153 1000BASE-T media interface> PHY 0 on miibus0
Nov 29 18:26:27 7950X3D-UFS kernel: rgephy0:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT-FDX, 1000baseT-FDX-master, auto
Nov 29 18:26:27 7950X3D-UFS kernel: ue0: <USB Ethernet> on ure0
Nov 29 18:26:27 7950X3D-UFS kernel: ue0: Ethernet address: REDACTED
Nov 29 18:26:27 7950X3D-UFS kernel: ue0: link state changed to DOWN
. . .
Nov 29 18:26:27 7950X3D-UFS kernel: ue0: link state changed to UP
. . . (no ue0: messages, then) . . .
Nov 30 03:23:18 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:18 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:18 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:18 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:18 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:18 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:19 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:20 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:20 7950X3D-UFS kernel: ue0: 2 link states coalesced
Nov 30 03:23:20 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:20 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:20 7950X3D-UFS dhclient[53725]: New IP Address (ue0): 192.168.1.157
Nov 30 03:23:20 7950X3D-UFS dhclient[53730]: New Subnet Mask (ue0): 255.255.255.0
Nov 30 03:23:20 7950X3D-UFS dhclient[53734]: New Broadcast Address (ue0): 192.168.1.255
Nov 30 03:23:20 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:20 7950X3D-UFS kernel: ue0: 3 link states coalesced
Nov 30 03:23:20 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:20 7950X3D-UFS dhclient[53771]: New Routers (ue0): 192.168.1.1
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: link state changed to DOWN
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: 3 link states coalesced
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: link state changed to UP
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: 2 link states coalesced
Nov 30 03:23:21 7950X3D-UFS kernel: ue0: link state changed to UP
. . . (lots more) . . .

Other FreeBSD system on the Ethernet are not getting such but none
of them are currently using such a dongle.

Note: The ASUS X670-P WiFi board's built in Ethernet is not
supported.

===
Mark Millard
marklmi at yahoo.com