On 26.5.2023 15.36, Mika Westerberg wrote:
Hi,
On Tue, May 23, 2023 at 01:15:30PM +0200, Christian Schaubschläger wrote:
Hi Mika,
attached you find two dmesg logs (with tunderbolt.dyndbg=+p), one from power off state were everything is ok (dmesg_ok.txt.xz).
The second one (dmesg_nok.txt.xz) is after a reboot when the network interface is in faulty state.
Hardware is:
Dell Inc. Latitude 7440/0XDRJY, BIOS 1.3.1 04/25/2023
CPU0: 13th Gen Intel(R) Core(TM) i5-1345U (family: 0x6, model: 0xba, stepping: 0x3)
thunderbolt 0-1: Dell WD19TB Thunderbolt Dock
Sorry for the delay. I've been busy with some other issues.
I guess we are talking about this xHCI:
[ 15.449690] xhci_hcd 0000:04:00.0: xHCI Host Controller
[ 15.450477] xhci_hcd 0000:04:00.0: new USB bus registered, assigned bus number 3
[ 15.452337] xhci_hcd 0000:04:00.0: hcc params 0x200077c1 hci version 0x110 quirks 0x00
00000200009810
[ 15.453734] xhci_hcd 0000:04:00.0: xHCI Host Controller
[ 15.454437] xhci_hcd 0000:04:00.0: new USB bus registered, assigned bus number 4
[ 15.455092] xhci_hcd 0000:04:00.0: Host supports USB 3.1 Enhanced SuperSpeed
In both cases the the SuperSpeed HUB is found:
[ 5.589178] usb 4-2.3: new SuperSpeed USB device number 3 using xhci_hcd
[ 5.622113] input: HDA Intel PCH Headphone Mic as /devices/pci0000:00/0000:00:1f.3/soun
d/card0/input27
[ 5.635536] hub 4-2.3:1.0: USB hub found
[ 5.637176] hub 4-2.3:1.0: 4 ports detected
However, the connected NIC is only found in dmesg_ok.txt.xz:
[ 5.904363] usb 4-2.4: new SuperSpeed USB device number 4 using xhci_hcd
...
[ 6.192613] r8152-cfgselector 4-2.4: reset SuperSpeed USB device number 4 using xhci_hcd
[ 6.217838] r8152 4-2.4:1.0 (unnamed net_device) (uninitialized): Using pass-thru MAC addr ac:91:a1:95:63:bf
[ 6.258478] r8152 4-2.4:1.0: load rtl8153b-2 v1 10/23/19 successfully
[ 6.318568] r8152 4-2.4:1.0 eth0: v1.12.13
To me it looks like the PCIe tunnel to the xHCI (0000:04:00.0) on the
dock works fine, otherwise it would not show up at all. I'm not an xHCI
expert so adding Mathias in case he has ideas how to debug this further.
I think it makes sense to enable xHCI debugging and traces and provide
them to Mathias. The following commands should do so:
# echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control
# echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control
# echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb
# echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable
Trace buffer is /sys/kernel/debug/tracing/trace.
Also worth testing if rebinding/resetting the 4 port USB 3.1 hub built into the dock with
the NIC connected to it helps.
# echo "4-2:1.0" > /sys/bus/usb/drivers/hub/unbind
# echo "4-2:1.0" > /sys/bus/usb/drivers/hub/bind
Thanks
-Mathias
