[Intel-wired-lan] [RFC PATCH] e1000e: Remove Other from EIAC.

[Brown, Aaron F]

> From: Brown, Aaron F
> Sent: Thursday, February 1, 2018 8:30 PM
> To: 'Benjamin Poirier' <bpoirier at suse.com>; Alexander Duyck
> <alexander.duyck at gmail.com>
> Cc: Netdev <netdev at vger.kernel.org>; intel-wired-lan <intel-wired-
> lan at lists.osuosl.org>; linux-kernel at vger.kernel.org
> Subject: RE: [Intel-wired-lan] [RFC PATCH] e1000e: Remove Other from EIAC.
> 
> > From: Intel-wired-lan [mailto:intel-wired-lan-bounces at osuosl.org] On
> > Behalf Of Benjamin Poirier
> > Sent: Tuesday, January 30, 2018 11:31 PM
> > To: Alexander Duyck <alexander.duyck at gmail.com>
> > Cc: Netdev <netdev at vger.kernel.org>; intel-wired-lan <intel-wired-
> > lan at lists.osuosl.org>; linux-kernel at vger.kernel.org
> > Subject: Re: [Intel-wired-lan] [RFC PATCH] e1000e: Remove Other from
> EIAC.
> >
> > On 2018/01/30 11:46, Alexander Duyck wrote:
> > > On Wed, Jan 17, 2018 at 10:50 PM, Benjamin Poirier
> <bpoirier at suse.com>
> > wrote:
> > > > It was reported that emulated e1000e devices in vmware esxi 6.5 Build
> > > > 7526125 do not link up after commit 4aea7a5c5e94 ("e1000e: Avoid
> > receiver
> > > > overrun interrupt bursts", v4.15-rc1). Some tracing shows that after
> > > > e1000e_trigger_lsc() is called, ICR reads out as 0x0 in
> e1000_msix_other()
> > > > on emulated e1000e devices. In comparison, on real e1000e 82574
> > hardware,
> > > > icr=0x80000004 (_INT_ASSERTED | _OTHER) in the same situation.
> > > >
> > > > Some experimentation showed that this flaw in vmware e1000e
> > emulation can
> > > > be worked around by not setting Other in EIAC. This is how it was
> before
> > > > 16ecba59bc33 ("e1000e: Do not read ICR in Other interrupt", v4.5-rc1).
> > > >
> > > > Fixes: 4aea7a5c5e94 ("e1000e: Avoid receiver overrun interrupt
> bursts")
> > > > Signed-off-by: Benjamin Poirier <bpoirier at suse.com>
> > > > ---
> > >
> > > Hi Benjamin,
> > >
> > > How would you feel about resubmitting this patch for net?
> > >
> > > We have some issues that have come up and it would be useful to have
> > > this fixed in the kernel sooner rather than later. I would be okay
> > > with us applying it for now while we work on coming up with a more
> > > complete solution.
> >
> > Ok, I've resent it in its original form. Once it's in mainline I'll
> > rebase the cleanups.
> 
> Tested-by: Aaron Brown
> <aaron.f.brown at intel.com>
Stupid line wrap ... been that kind of day.

Tested-by: Aaron Brown <aaron.f.brown at intel.com>

> 
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