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

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Message-ID: <20250218193646.GJ1615191@kernel.org>
Date: Tue, 18 Feb 2025 19:36:46 +0000
From: Simon Horman <horms@...nel.org>
To: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	marcin.szycik@...ux.intel.com, jedrzej.jagielski@...el.com,
	przemyslaw.kitszel@...el.com, piotr.kwapulinski@...el.com,
	anthony.l.nguyen@...el.com, dawid.osuchowski@...el.com,
	pmenzel@...gen.mpg.de
Subject: Re: [iwl-next v3 3/4] ixgbe: add Tx hang detection unhandled MDD

On Mon, Feb 17, 2025 at 10:06:35AM +0100, Michal Swiatkowski wrote:
> From: Slawomir Mrozowicz <slawomirx.mrozowicz@...el.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@...el.com>
> Reviewed-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
> Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz@...el.com>
> Co-developed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

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