ThunderX: TX failure unless checksum offload disabled

Bug #1736593 reported by Scott Burns on 2017-12-05
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Undecided
dann frazier
Artful
Undecided
dann frazier

Bug Description

[Impact]
Most attempts to use IPv6 on the ThunderX NIC will fail.

[Test Case]
Attempt an IPv6 TCP connection:

$ wget -6 'http://www.kernel.org/'

The connection will time out.

[Regression Risk]
The fix is upstream, and is limited to the ThunderX nicvf driver.

[Workaround]
Disable TX checksum offload:

$ ethtool -K eth0 tx off

[More Details]
The issue first appears in Linux 4.12. A fix from Cavium has been merged upstream:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/ethernet/cavium/thunder/nicvf_queues.c?id=fa6d7cb5d76cf0467c61420fc9238045aedfd379

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1736593

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
dann frazier (dannf) on 2017-12-05
Changed in linux (Ubuntu):
status: Incomplete → In Progress
assignee: nobody → dann frazier (dannf)
Changed in linux (Ubuntu Artful):
status: New → Incomplete
status: Incomplete → In Progress
assignee: nobody → dann frazier (dannf)
Seth Forshee (sforshee) on 2017-12-13
Changed in linux (Ubuntu):
status: In Progress → Fix Committed
dann frazier (dannf) on 2017-12-18
summary: - ThunderX: IPv6 TX failure unless checksum offload disabled
+ ThunderX: TX failure unless checksum offload disabled
Changed in linux (Ubuntu Artful):
status: In Progress → Fix Committed

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-artful' to 'verification-done-artful'. If the problem still exists, change the tag 'verification-needed-artful' to 'verification-failed-artful'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-artful

Thank you. We will be testing this new kernel at Packet and will report results.

On Wed, Feb 14, 2018 at 8:53 AM, Edward Vielmetti
<email address hidden> wrote:
> Thank you. We will be testing this new kernel at Packet and will report
> results.

Thanks Edward. Please beware of LP: #1749040 as you test. We're not
seeing it with the latest build, but it is not yet root-caused.

  -dann

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