Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Dan Streetman (ddstreet)
Status: In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Dan Streetman (ddstreet)
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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
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1723127/+subscriptions
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