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[Launchpad Bug Tracker <1540405@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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

Title:
  i40e fails virtual networking

Status in linux package in Ubuntu:
  Expired

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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