Comment 47 for bug 1729674

I reviewed your patch, and it appears as if it only turns off receive
checksumming. The internets are saying that transmit needs to be turned off
as well. Have you checked to see if transmit is affected as well?

I will try to do some transmit tests. I'll also "test" your kernel when I
get a chance, but by the looks of the patch there shouldn't be too much to
test as it simply turns off RX checksuming which is already a known good
solution.

On Mon, Nov 20, 2017 at 2:06 AM, Kai-Heng Feng <email address hidden>
wrote:

> Dave,
>
> Please try this kernel,
> http://people.canonical.com/~khfeng/lp1729674/
>
> The temporary workaround is what we can get before chip vendors solve
> the issue.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> 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:
> In Progress
> 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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>