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

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Message-ID: <DS4PPF7A003104525715E850768908902A58F45A@DS4PPF7A0031045.namprd11.prod.outlook.com>
Date: Fri, 27 Jun 2025 09:49:01 +0000
From: "Romanowski, Rafal" <rafal.romanowski@...el.com>
To: Simon Horman <horms@...nel.org>, Michal Swiatkowski
	<michal.swiatkowski@...ux.intel.com>
CC: "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"marcin.szycik@...ux.intel.com" <marcin.szycik@...ux.intel.com>, "Jagielski,
 Jedrzej" <jedrzej.jagielski@...el.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, "Kwapulinski, Piotr"
	<piotr.kwapulinski@...el.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, "Osuchowski, Dawid"
	<dawid.osuchowski@...el.com>, "pmenzel@...gen.mpg.de" <pmenzel@...gen.mpg.de>
Subject: RE: [Intel-wired-lan] [iwl-next v3 3/4] ixgbe: add Tx hang detection
 unhandled MDD

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Simon
> Horman
> Sent: Tuesday, February 18, 2025 8:37 PM
> To: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> Cc: intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org;
> marcin.szycik@...ux.intel.com; Jagielski, Jedrzej <jedrzej.jagielski@...el.com>;
> Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>; Kwapulinski, Piotr
> <piotr.kwapulinski@...el.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; Osuchowski, Dawid
> <dawid.osuchowski@...el.com>; pmenzel@...gen.mpg.de
> Subject: Re: [Intel-wired-lan] [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>

Tested-by: Rafal Romanowski <rafal.romanowski@...el.com>