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[Bug 1723127] Re: Intel i40e PF reset due to incorrect MDD detection (continues...)

 

As mentioned, upstream commit 248de22e638f10bd5bfc7624a357f940f66ba137
("i40e/i40evf: Account for frags split over multiple descriptors in
check linearize") appears to finally fix this.  This commit is already
included in bionic, but is required in artful and earlier.

In xenial, the commit 5c4654daf2e2f25dfbd7fa572c59937ea6d4198b
("i40e/i40evf: Allow up to 12K bytes of data per Tx descriptor instead
of 8K") is also required.


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

** Changed in: linux (Ubuntu Artful)
     Assignee: (unassigned) => Dan Streetman (ddstreet)

** Changed in: linux (Ubuntu Artful)
   Importance: Undecided => Medium

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

** Changed in: linux (Ubuntu Artful)
       Status: Incomplete => In Progress

** Also affects: linux (Ubuntu Bionic)
   Importance: Medium
     Assignee: Dan Streetman (ddstreet)
       Status: In Progress

** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Fix Released

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

** Changed in: linux (Ubuntu Trusty)
       Status: New => Won't Fix

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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:
  Fix Released
Status in linux source package in Trusty:
  Won't Fix
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  Fix Released

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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