USB 4 / Thunderbolt 3 NIC

[tqt3e]

I tried to use a Thunderbolt 3 NIC with Intel 82599 chip inside, but Proxmox doesn't recognize it & doesn't create the network interfaces.
Proxmox is on v9.06, all latest updates installed. Also Tried with & without Secure boot & trusted computing.

Tested to work on windows, so doesn't seem to be a cable / hardware problem.

So for, I have already enrolled the device with boltctl, and it seems to detect & connect:

boltctl info be030000-0042-441e-03d3-47dc4a45d808
 ● Shenzhen Dongman Technology Co.,ltd DM7801BJ
   ├─ type:          peripheral
   ├─ name:          DM7801BJ
   ├─ vendor:        Shenzhen Dongman Technology Co.,ltd
   ├─ uuid:          be030000-0042-441e-03d3-47dc4a45d808
   ├─ dbus path:     /org/freedesktop/bolt/devices/be030000_0042_441e_03d3_47dc4a45d808
   ├─ generation:    Thunderbolt 3
   ├─ status:        authorized
   │  ├─ domain:     ffbc3804-005f-01bd-ffff-ffffffffffff
   │  ├─ parent:     ffbc3804-005f-01bd-ffff-ffffffffffff
   │  ├─ syspath:    /sys/devices/pci0000:00/0000:00:08.3/0000:c7:00.5/domain0/0-0/0-2
   │  ├─ rx speed:   40 Gb/s = 2 lanes * 20 Gb/s
   │  ├─ tx speed:   40 Gb/s = 2 lanes * 20 Gb/s
   │  └─ authflags:  none
   ├─ authorized:    Sat 30 Aug 2025 10:45:08 AM UTC
   ├─ connected:     Sat 30 Aug 2025 10:45:05 AM UTC
   └─ stored:        Thu 28 Aug 2025 09:48:45 AM UTC
      ├─ policy:     auto
      └─ key:        no

Proxmox seems to only 'see' the thunderbolt device, but not the NIC.

> lspci
05:00.0 PCI bridge: Intel Corporation JHL7440 Thunderbolt 3 Bridge [Titan Ridge DD 2018] (rev 06)
06:01.0 PCI bridge: Intel Corporation JHL7440 Thunderbolt 3 Bridge [Titan Ridge DD 2018] (rev 06)
06:02.0 PCI bridge: Intel Corporation JHL7440 Thunderbolt 3 Bridge [Titan Ridge DD 2018] (rev 06)
06:04.0 PCI bridge: Intel Corporation JHL7440 Thunderbolt 3 Bridge [Titan Ridge DD 2018] (rev 06)

Any suggestions on what I can do next?

 

[Flocki]

Did you try unplugging and replugging while the system is running?

 

[tqt3e]

Did you try unplugging and replugging while the system is running?

I got it working by a few args into grub: GRUB_CMDLINE_LINUX_DEFAULT="pci=assign-busses,realloc,hpbussize=0x10,hpmmiosize=128M,hpmmioprefsize=1G"

Though it struggles to reconnect after rebooting Proxmox.

 

[readyspace]

@tqt3e you might want to check if there is an update on Bios firmware available. I suspect that there is a need to update it.

 

[tqt3e]

@tqt3e you might want to check if there is an update on Bios firmware available. I suspect that there is a need to update it.

Unfortunately it already has latest available BIOS installed. AMD CPU microcode is also up to date.

 

[scolary]

I had the same problem. I also needed to pass through my network card to OpenWRT via Thunderbolt 3. You also need to go into the BIOS, enable Thunderbolt support, and set the Security Level to No Security. I've succeeded. Good luck to you.