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[Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1723127

Title:
  Intel i40e PF reset due to incorrect MDD detection (continues...)

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  This is a continuation from bug 1713553; a patch was added in that bug
  to attempt to fix this, and it may have helped reduce the issue but
  appears not to have fixed it, based on more reports.

  The issue is the i40e driver, when TSO is enabled, sometimes sees the
  NIC firmware issue a "MDD event" where MDD is "Malicious Driver
  Detection".  This is vaguely defined in the i40e spec, but with no way
  to tell what the NIC actually saw that it didn't like.  So, the driver
  can do nothing but print an error message and reset the PF (or VF).
  Unfortunately, this resets the interface, which causes an interruption
  in network traffic flow while the PF is resetting.

  See bug 1713553 for more details.

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