The issue is not unique to the integrated NIC in the dock (so the
current workaround in r8152 is not sufficient). I have a r8152-based TP-
LINK UE300 USB3-to-GigE dongle connected to my TB16 dock and I'm getting
the same packet corruption when I don't turn off rx checksum offloading.
usb 4-1.1.1: new SuperSpeed Gen 1 USB device number 5 using xhci_hcd
usb 4-1.1.1: New USB device found, idVendor=2357, idProduct=0601,
bcdDevice=30.00
usb 4-1.1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=6
usb 4-1.1.1: Product: USB 10/100/1000 LAN
usb 4-1.1.1: Manufacturer: TP-LINK
usb 4-1.1.1: SerialNumber: 000001000000
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/7p, 5000M
|__ Port 1: Dev 3, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 1: Dev 5, If 0, Class=Vendor Specific Class, Driver=r8152,
5000M
|__ Port 4: Dev 6, If 0, Class=Hub, Driver=hub/2p, 5000M
|__ Port 2: Dev 4, If 0, Class=Vendor Specific Class, Driver=r8152,
5000M
The dongle is plugged into the internal USB hub in my Dell U2715H
screen, which is in turn plugged into the TB16 (latest firmware 1.0.0),
connected to my XPS 15 9560 (latest BIOS 1.11.0, Linux
4.18.7-200.fc28.x86_64 at the moment).
I've also seen someone mentioning that (some) USB3 ports on the TB16 are
in fact Alpine Ridge pass-through. That does not seem to be the case
here, all three ports on my TB16 go through the ASMedia host controller:
0e:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host
Controller
The r8152 workaround triggers just fine for the integrated NIC in the
dock:
usb 4-1.2: reset SuperSpeed Gen 1 USB device number 4 using xhci_hcd
usb 4-1.2: Dell TB16 Dock, disable RX aggregation
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729674
Title:
TB16 dock ethernet corrupts data with hw checksum silently failing
Status in Dell Sputnik:
Triaged
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Artful:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux package in Fedora:
Confirmed
Bug description:
It looks like TCP rx and tx checksum offloading is broken on the TB16 dock's
ethernet adapter. For example downloading a large file such as the Ubuntu ISO,
and then running an md5sum on it yields the incorrect md5sum. This is because
rx-checksumming: on
tx-checksumming: on
and both set to on by default.
Running sudo ethtool -K <TB16 eth device> tx off rx off, allows the
download to complete correctly. This is very bad since this can cause
very bad untrustworthy behavior.
This was conducted using an Dell Precision 5520 on Ubuntu 16.04+linux-
generic-hwe-16.04-edge.
Thank you
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