Comment 0 for bug 1723127

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.