Re: [Intel-wired-lan] [iwl-next v3 3/4] ixgbe: add Tx hang detection unhandled MDD

[Simon Horman <horms@kernel.org>]

On Mon, Feb 17, 2025 at 10:06:35AM +0100, Michal Swiatkowski wrote:
> From: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
> 
> Add Tx Hang detection due to an unhandled MDD Event.
> 
> Previously, a malicious VF could disable the entire port causing
> TX to hang on the E610 card.
> Those events that caused PF to freeze were not detected
> as an MDD event and usually required a Tx Hang watchdog timer
> to catch the suspension, and perform a physical function reset.
> 
> Implement flows in the affected PF driver in such a way to check
> the cause of the hang, detect it as an MDD event and log an
> entry of the malicious VF that caused the Hang.
> 
> The PF blocks the malicious VF, if it continues to be the source
> of several MDD events.
> 
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Reviewed-by: Marcin Szycik <marcin.szycik@linux.intel.com>
> Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
> Co-developed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
> Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>