Networking over Thunderbolt. Ethernet device missing.

ComputerUser · 06-17-2021, 09:15 PM

I have two Intel NUCs (NUC10i7FNH).

I'm trying to do set up a network over thunderbolt between them for the purpose of implementing DRBD and keep the replication traffic off network they are attached to.

Running an up to date Debian Testing.

The thunderbolt device is recognized:

Code:

00:00.0 Host bridge: Intel Corporation Device 9b51
00:02.0 VGA compatible controller: Intel Corporation Device 9bca (rev 04)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Comet Lake Thermal Subsytem
00:14.0 USB controller: Intel Corporation Comet Lake PCH-LP USB 3.1 xHCI Host Controller
00:14.2 RAM memory: Intel Corporation Comet Lake PCH-LP Shared SRAM
00:14.3 Network controller: Intel Corporation Comet Lake PCH-LP CNVi WiFi
00:15.0 Serial bus controller [0c80]: Intel Corporation Serial IO I2C Host Controller
00:15.2 Serial bus controller [0c80]: Intel Corporation Device 02ea
00:16.0 Communication controller: Intel Corporation Comet Lake Management Engine Interface
00:17.0 SATA controller: Intel Corporation Comet Lake SATA AHCI Controller
00:1c.0 PCI bridge: Intel Corporation Device 02bc (rev f0)
00:1d.0 PCI bridge: Intel Corporation Device 02b0 (rev f0)
00:1d.5 PCI bridge: Intel Corporation Device 02b5 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Comet Lake PCH-LP LPC Premium Controller/eSPI Controller
00:1f.3 Audio device: Intel Corporation Comet Lake PCH-LP cAVS
00:1f.4 SMBus: Intel Corporation Comet Lake PCH-LP SMBus Host Controller
00:1f.5 Serial bus controller [0c80]: Intel Corporation Comet Lake SPI (flash) Controller
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (10) I219-V
01:00.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 2C 2018] (rev 06)
02:00.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 2C 2018] (rev 06)
02:01.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 2C 2018] (rev 06)
02:02.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 2C 2018] (rev 06)
03:00.0 System peripheral: Intel Corporation JHL7540 Thunderbolt 3 NHI [Titan Ridge 2C 2018] (rev 06)
39:00.0 USB controller: Intel Corporation JHL7540 Thunderbolt 3 USB Controller [Titan Ridge 2C 2018] (rev 06)
3a:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983
3b:00.0 SD Host controller: Genesys Logic, Inc Device 9755

And, I've followed the instructions here: https://www.kernel.org/doc/html/late...underbolt.html, including modprobe thunderbolt-net (actually, I did that on both hosts).

However I don't get a network interface to configure. Nothing is printed out in the logs or dmesg.

I did read a stack overflow post or something where by a guy had to boot into Windows and configure the thunderbolt device not to sleep, then it worked in Linux. I haven't tried that. These machines don't have Windows installed.

Aside from installing Windows, I'm lost on what to do next. Can any one help?

EDIT:

Code:

tbtadm devices

produces no output.

business_kid · 06-19-2021, 06:27 AM

Hi ComputerUser, & welcome to LQ.

I'd imagine an autosleep would hardly be enabled from initialization. Have you thought of exploring

Module options?
BIOS Options
Setting a ping or dhcp going in the init scripts as a last resort

The module probably is the best way to go about this, even if it means getting on the LKML and filing a kernel bug. It's bound to be a known issue. I just don't know it.

ComputerUser · 06-20-2021, 08:34 PM

I think I may have figured it out. As per usual, the problem is sitting in front of the computer, and I assumed what I now know to be an "Apple Charge Cable" was a thunderbolt cable. I'll find out in a day or so once the ordered certified thunderbolt 3 cable turns up.