[no link] DS918+ Club3D CAC-1420 does not work

[SharkyRawr]

Description of the problem

My USB adapter installs ok, shows up in network devices but never achieves any link.

What I tried:

• Full reinstall as per https://github.com/bb-qq/r8152/wiki/Troubleshooting
  • Following other steps including: install-udev-rules and ethtool -s eth2 autoneg on advertise 0x802f to no effect
  • Tried other guides from google, setting speed, rx buffers and duplex settings with ethtool has no effect.
• Tried unbind/bind'ing the USB device, tried turning on/off USB auto-suspend on the built-in hub and device, no effect
• Tried rebooting, no effect
• Tried without any other USB devices, no effect

Description of your products

• DS918+
  • DSM 7.2.1-69057 Update 5
  • r8152 release 2.18.1-1
• Club3D CAC-1420 2.5Gbps USB adapter (type A)

Description of your environment

• Connected to 2.5Gbps QNAP switch
• Cat 5e cable (1 meter)
• All other devices work fine, no issues besides this adapter

Output of dmesg command

[  958.245770] usb 2-2: reset SuperSpeed USB device number 3 using xhci_hcd
[  958.330975] r8152 2-2:1.0 eth2: v2.18.1 (2024/05/20)
[  958.336626] r8152 2-2:1.0 eth2: This product is covered by one or more of the following patents:
               		US6,570,884, US6,115,776, and US6,327,625.

[  958.354070] r8152 2-2:1.0 eth2: chip rev 12
[  958.358910] usbcore: registered new interface driver r8152
[  958.485100] IPv6: ADDRCONF(NETDEV_UP): eth2: link is not ready
[  958.523793] device ovs_eth2 entered promiscuous mode
[  958.529429] audit: type=1700 audit(1729515330.534:117): dev=ovs_eth2 prom=256 old_prom=0 auid=4294967295 uid=0 gid=0 ses=4294967295
[  958.569847] device eth2 entered promiscuous mode
[  958.575119] audit: type=1700 audit(1729515330.579:118): dev=eth2 prom=256 old_prom=0 auid=4294967295 uid=0 gid=0 ses=4294967295
[  958.592893] IPv6: ADDRCONF(NETDEV_UP): ovs_eth2: link is not ready

Output of lsusb command

|__usb1          1d6b:0002:0404 09  2.00  480MBit/s 0mA 1IF  (Linux 4.4.302+ xhci-hcd xHCI Host Controller 0000:00:15.0) hub
  |__1-4         f400:f400:0100 00  2.00  480MBit/s 200mA 1IF  (Synology DiskStation)
|__usb2          1d6b:0003:0404 09  3.00 5000MBit/s 0mA 1IF  (Linux 4.4.302+ xhci-hcd xHCI Host Controller 0000:00:15.0) hub
  |__2-1         0781:5583:0100 00  3.00 5000MBit/s 896mA 1IF  (SanDisk Ultra Fit)
  |__2-2         0bda:8156:3000 00  3.20 5000MBit/s 512mA 1IF  (Realtek USB 10/100/1G/2.5G LAN 000000001)

Output of ethtool

~# ethtool eth2
Settings for eth2:
	Supported ports: [ MII ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	                        2500baseX/Full
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	                        2500baseX/Full
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: Unknown!
	Duplex: Unknown! (255)
	Port: MII
	PHYAD: 32
	Transceiver: internal
	Auto-negotiation: on
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00007fff (32767)
			       drv probe link timer ifdown ifup rx_err tx_err tx_queued intr tx_done rx_status pktdata hw wol
	Link detected: no

# sudo ethtool -s eth2 speed 2500 duplex full autoneg off
Cannot set new settings: Invalid argument
  not setting speed
  not setting duplex
  not setting autoneg

[bb-qq]

I have no idea what could be the cause as it has been reported to have worked in this device combination. What about replacing the Ethernet cable or connecting the CAC-1420 to the PC instead of the DS918?