netdev - RE: [net] e1000e: enable ECC on I217/I218 to catch packet buffer memory errors

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Date:	Mon, 28 Jan 2013 17:46:32 +0000
From:	"Allan, Bruce W" <bruce.w.allan@...el.com>
To:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	Josh Boyer <jwboyer@...il.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [net] e1000e: enable ECC on I217/I218 to catch packet buffer
 memory errors

> -----Original Message-----
> From: Kirsher, Jeffrey T
> Sent: Monday, January 28, 2013 4:46 AM
> To: Josh Boyer
> Cc: davem@...emloft.net; Allan, Bruce W; netdev@...r.kernel.org;
> gospo@...hat.com; sassmann@...hat.com; stable@...r.kernel.org
> Subject: Re: [net] e1000e: enable ECC on I217/I218 to catch packet buffer
> memory errors
> 
> On Mon, 2013-01-28 at 07:38 -0500, Josh Boyer wrote:
> > On Mon, Jan 28, 2013 at 5:43 AM, Jeff Kirsher
> > <jeffrey.t.kirsher@...el.com> wrote:
> > > From: Bruce Allan <bruce.w.allan@...el.com>
> > >
> > > In rare instances, memory errors have been detected in the internal
> packet
> > > buffer memory on I217/I218 when stressed under certain
> environmental
> > > conditions.  Enable Error Correcting Code (ECC) in hardware to catch
> both
> > > correctable and uncorrectable errors.  Correctable errors will be handled
> > > by the hardware.  Uncorrectable errors in the packet buffer will cause
> the
> > > packet to be received with an error indication in the buffer descriptor
> > > causing the packet to be discarded.  If the uncorrectable error is in the
> > > descriptor itself, the hardware will stop and interrupt the driver
> > > indicating the error.  The driver will then reset the hardware in order to
> > > clear the error and restart.
> > >
> > > Both types of errors will be accounted for in statistics counters.
> > >
> > > Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
> > > Cc: <stable@...r.kernel.org> # 3.5.x & 3.6.x
> >
> > 3.5.x is maintained by Canonical, not officially as a stable kernel (I
> > have no idea why).  3.6.x isn't maintained any longer.
> >
> > Is this applicable to 3.4.x and 3.7.x?
> 
> It is applicable to 3.7.x, not sure if it applicable to 3.4.x.

Not applicable to 3.4.x (no support for I217 or I218 prior to 3.5 which was not yet EOL'ed
when I originally wrote this patch).

Bruce.