netdev - RE: [PATCH v2 0/5] Improve s0ix flows for systems i219LM

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Date:   Wed, 2 Dec 2020 20:23:08 +0000
From:   "Limonciello, Mario" <Mario.Limonciello@...l.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Sasha Netfin <sasha.neftin@...el.com>,
        Aaron Brown <aaron.f.brown@...el.com>,
        Stefan Assmann <sassmann@...hat.com>,
        David Miller <davem@...emloft.net>,
        "darcari@...hat.com" <darcari@...hat.com>,
        "Shen, Yijun" <Yijun.Shen@...l.com>,
        "Yuan, Perry" <Perry.Yuan@...l.com>
Subject: RE: [PATCH v2 0/5] Improve s0ix flows for systems i219LM

> > > On Wed,  2 Dec 2020 10:17:43 -0600 Mario Limonciello wrote:
> > > > commit e086ba2fccda ("e1000e: disable s0ix entry and exit flows for ME
> > > systems")
> > > > disabled s0ix flows for systems that have various incarnations of the
> > > > i219-LM ethernet controller.  This was done because of some regressions
> > > > caused by an earlier
> > > > commit 632fbd5eb5b0e ("e1000e: fix S0ix flows for cable connected case")
> > > > with i219-LM controller.
> > > >
> > > > Performing suspend to idle with these ethernet controllers requires a
> > > properly
> > > > configured system.  To make enabling such systems easier, this patch
> > > > series allows turning on using ethtool.
> > > >
> > > > The flows have also been confirmed to be configured correctly on Dell's
> > > Latitude
> > > > and Precision CML systems containing the i219-LM controller, when the
> kernel
> > > also
> > > > contains the fix for s0i3.2 entry previously submitted here:
> > > > https://marc.info/?l=linux-netdev&m=160677194809564&w=2
> > > >
> > > > Patches 3 and 4 will turn the behavior on by default for Dell's CML
> systems.
> > > > Patch 5 allows accessing the value of the flags via ethtool to tell if
> the
> > > > heuristics have turned on s0ix flows, as well as for development
> purposes
> > > > to determine if a system should be added to the heuristics list.
> > >
> > > I don't see PCI or Bjorn Helgaas CCed.
> > >
> > > You can drop linux-kernel tho.
> >
> > Correct, that was intentional that PCI (and Bjorn) weren't added.  Since I
> came
> > up with a way to detect platforms without DMI as suggested and this is
> entirely
> > controlling a driver behavior within e1000e only on systems with i219-LM I
> > didn't think that PCI ML was actually needed.
> >
> > Since you disagree, I'll add Bjorn into this thread.
> >
> > @Bjorn Helgaas,
> >
> > Apologies that you're looped in this way rather than directly to the
> submission,
> > but the cover letter is above and the patch series can be viewed at this
> patchwork
> > if you would like to fetch the mbox and respond to provide any comments.
> >
> > https://patchwork.ozlabs.org/project/netdev/list/?series=218121
> >
> > I'll include you directly if any future v3 is necessary.
> 
> No need, I don't think.  AFAICT there's nothing there related to the
> PCI core.  Thanks!
> 
> Bjorn

Thanks, appreciate your comments on my terrible grammar.
I'll fix up my commits from the series and submit v3 once I've got some code feedback
from netdev folks.