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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1540405

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

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https://bugs.launchpad.net/bugs/1540405

Title:
  i40e fails virtual networking

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  With linux-hwe-generic-trusty we see kern.log entries for "TX driver
  issue detected, PF reset issued" on a  NIC in a bond, followed by the
  same interface going down and up again. After this time networking to
  virtual machines bridged to that bond fails.

  We see either asymmetric traffic, with ARP replies not reaching the
  VMs, or no traffic at all to or from VMs.

  In this context, these are nova-compute nodes using OpenvSwitch and
  KVM.

  Reloading the i40e module corrects the networking.

  Setting TCP Segmentation Offload off on the NICs seems to prevent the
  PF reset, and we don't believe we have seen VM networking problems
  since doing so.

  # ethtool -i eth5
  driver: i40e
  version: 1.3.4-k
  firmware-version: f4.33.31377 a1.2 n4.41 e1866
  bus-info: 0000:04:00.1
  supports-statistics: yes 
  supports-test: yes 
  supports-eeprom-access: yes 
  supports-register-dump: yes 
  supports-priv-flags: yes

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