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Jacob Keller authored
Commit d3d657a9 ("i40e: update VFs of link state after GET_VF_RESOURCES") modified the PF driver to notify a VF of its link status immediately after it requests resources. This was intended to fix reporting on VF drivers, so that they would properly report link status. However, some older VF drivers do not respond well to receiving a link up notification before queues are enabled. This can cause their state machine to think that it is safe to send traffic. This results in a Tx hang on the VF. More recent versions of the old i40evf and all versions of iavf are resilient to these early link status messages. However, if a VM happens to run an older version of the VF driver, this can be problematic. Record whether the PF has actually enabled queues for the VF. When reporting link status, always report link down if the queues aren't enabled. In this way, the VF driver will never receive a link up notification until after its queues are enabled. Signed-off-by:
Jacob Keller <jacob.e.keller@intel.com> Tested-by:
Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by:
Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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