Bug 2218929

Summary: Network device on Thundebolt 4 Dock does not work when PCIe tunneling is enabled in BIOS
Product: [Fedora] Fedora Reporter: Martin Tessun <mtessun>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 38CC: acaringi, adscvr, airlied, alciregi, bskeggs, hdegoede, hpa, jarodwilson, jbilling, josef, kernel-maint, lgoncalv, linville, masami256, mchehab, ptalbert, steved
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Hardware: x86_64   
OS: Linux   
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Description Flags
Boot messaged from PCIe tunneling=yes+ none

Description Martin Tessun 2023-06-30 15:27:47 UTC
Created attachment 1973420 [details]
Boot messaged from PCIe tunneling=yes+

1. Please describe the problem:
When using a TB4 dock from Lenovo with a Network device that device crashes in case the TB4 dock is attached with "PCIe tunneling : Yes" in the BIOS.
If you do not enable this, the network device is instead identified as a usbnet and works.

2. What is the Version-Release number of the kernel:
6.3.8-200.fc38.x86_64

3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :

Probably is there longer - did not test with older kernels and the device itself is new.

4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:

- Use a TB4 (40B0) dock from Lenovo and attach to a T14s laptop with "PCIe tunneling" set to yes in the BIOS
- boot the system with the network cable attached to the docks network port
- The network port crashes shortly after the boot.


5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:

Not tested.

6. Are you running any modules that not shipped with directly Fedora's kernel?:

No. (I think) this is a CSB.

7. Please attach the kernel logs. You can get the complete kernel log
   for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the
   issue occurred on a previous boot, use the journalctl ``-b`` flag.

Attached - let me know if you need a boot with no PCIe tunneling enabled.