Indeed, I found the mention of the pass-through only applying to the
USB-C like a minute after I wrote my previous comment. Sorry for the
noise.
I don't have a C-A adapter at hand, but I've tried using the Dell DA200
adapter instead (not exactly the same thing as it's an extra hub, but
hopefully it helps anyway). So the topology is:
Dongle -> DA200 (hub) -> USB-C port on the TB16 -> AR host controller
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 10000M
|__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 1: Dev 5, If 0, Class=Vendor Specific Class, Driver=r8152,
5000M
|__ Port 4: Dev 3, If 0, Class=Vendor Specific Class, Driver=r8152,
5000M
0f:00.0 USB controller: Intel Corporation DSL6540 USB 3.1 Controller
[Alpine Ridge]
This setup works fine without any corruption with all offloads on
(default).
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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
To manage notifications about this bug go to:
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