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List: e1000-devel
Subject: Re: [E1000-devel] Regarding 82599 SR-IOV support in MSI
From: "Ronciak, John" <john.ronciak () intel ! com>
Date: 2013-06-17 10:09:57
Message-ID: D38E8E86660E514AB505863C19C9287C73E55298 () ORSMSX102 ! amr ! corp ! intel ! com
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Yes, Greg is correct. SR-IOV _requires_ MSI-X. If there is no MSI-X you =
cannot get SR-IOV to work correctly.
It is that simple. Sorry.
Cheers,
John
> -----Original Message-----
> From: mhban [mailto:mhban@samsung.com]
> Sent: Monday, June 17, 2013 3:00 AM
> To: Rose, Gregory V; Skidmore, Donald C
> Cc: Ronciak, John; Kirsher, Jeffrey T; e1000-
> devel@lists.sourceforge.net; Brandeburg, Jesse
> Subject: RE: [E1000-devel] Regarding 82599 SR-IOV support in MSI
> =
> Hi Greg,
> =
> By the way, I have Intel Centerton (S1200) board also. As far as I know
> Centerton support only MSI but X520 IOV seems work well in this board.
> Am I mistaken?
> =
> Regards,
> Minho Ban
> =
> -----Original Message-----
> From: Greg Rose [mailto:gregory.v.rose@intel.com]
> Sent: Saturday, June 15, 2013 6:23 AM
> To: Skidmore, Donald C
> Cc: mhban; Ronciak, John; Kirsher, Jeffrey T; e1000-
> devel@lists.sourceforge.net; Brandeburg, Jesse
> Subject: Re: [E1000-devel] Regarding 82599 SR-IOV support in MSI
> =
> On Fri, 14 Jun 2013 17:09:49 +0000
> "Skidmore, Donald C" <donald.c.skidmore@intel.com> wrote:
> =
> > We haven't implemented this as you know so I haven't looked in to it
> > at all in detail but off the top of my head:
> >
> > There is only one interrupt with MSI per say, as John mentioned. So
> > you will either have to only get all interrupts in the PF and have it
> > tell the VF who they belonged to, nasty latency if doable at all. Or
> > have all VF's and the PF interrupted for any interrupt that was
> > destine for any VF or the PF. This second choice would be a lot of
> > overhead and also would mean any VF would know when other VF's were
> > getting interrupts (security issue?).
> =
> The VF cannot send MSI interrupts, period. It is a HW limitation -
> they only support MSIX. It is not possible to use MSI with Intel VF
> devices in any way or manner.
> =
> - Greg
> =
> >
> > Thanks,
> > -Don Skidmore <donald.c.skidmore@intel.com>
> >
> > > -----Original Message-----
> > > From: mhban [mailto:mhban@samsung.com]
> > > Sent: Thursday, June 13, 2013 7:50 PM
> > > To: Ronciak, John; Skidmore, Donald C; Kirsher, Jeffrey T
> > > Cc: e1000-devel@lists.sourceforge.net; Brandeburg, Jesse
> > > Subject: RE: [E1000-devel] Regarding 82599 SR-IOV support in MSI
> > >
> > > Dear John and Don,
> > > Thanks for kind reply.
> > >
> > > This ARM SoC doesn't have additional features for virtualization
> > > like VT-d. And I'm not going to use SR-IOV for virtualization. I
> > > just want to do some experimental VF test only with limited 2 or 4.
> > >
> > > BTW, I have one more question about this.
> > > Do you mean root-port can receive interrupt from VFs that are
> > > configured as MSI mode?
> > > If so, is it possible to differentiate between them? For example,
> by
> > > reading flag registers again or something like that.
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Ronciak, John [mailto:john.ronciak@intel.com]
> > > Sent: Friday, June 14, 2013 12:13 AM
> > > To: Skidmore, Donald C; mhban; Kirsher, Jeffrey T
> > > Cc: e1000-devel@lists.sourceforge.net; Brandeburg, Jesse
> > > Subject: RE: [E1000-devel] Regarding 82599 SR-IOV support in MSI
> > >
> > > Hello,
> > >
> > > No it's not possible. MSI-X is needed so that interrupts can be
> > > routed to each guest. With MSI there is only a single interrupt so
> > > there is no way to route it to multiple VF's. MSI-X is a
> > > requirement for SR-IOV support. So don's comments below are
> > > correct. Sorry.
> > >
> > > Does this system support VT-d or something like it for the address
> > > translations? Just curious.
> > >
> > > Cheers,
> > > John
> > >
> > > Cheers,
> > > John
> > >
> > >
> > > > -----Original Message-----
> > > > From: Skidmore, Donald C [mailto:donald.c.skidmore@intel.com]
> > > > Sent: Thursday, June 13, 2013 7:17 AM
> > > > To: mhban; Kirsher, Jeffrey T
> > > > Cc: e1000-devel@lists.sourceforge.net; Brandeburg, Jesse
> > > > Subject: Re: [E1000-devel] Regarding 82599 SR-IOV support in MSI
> > > >
> > > > Hey Minho,
> > > >
> > > > I believe that it would be problematic at best since as MSI uses
> > > > identical address for all vectors in a Function and
> differentiates
> > > > vectors in a Function only by LSBs in data.
> > > >
> > > > Thanks,
> > > > -Don Skidmore <donald.c.skidmore@intel.com>
> > > >
> > > > > -----Original Message-----
> > > > > From: mhban [mailto:mhban@samsung.com]
> > > > > Sent: Thursday, June 13, 2013 12:40 AM
> > > > > To: Kirsher, Jeffrey T
> > > > > Cc: e1000-devel@lists.sourceforge.net; Brandeburg, Jesse
> > > > > Subject: [E1000-devel] Regarding 82599 SR-IOV support in MSI
> > > > >
> > > > > Dear maintainer and all SR-IOV experts,
> > > > >
> > > > > I'm developing a board which is based on ARM SoC which support
> > > > > PCI Express root-port.
> > > > > I'm trying to install and activate SR-IOV with Intel X520-SR2
> on
> > > > > this board(/w Linux). Up to now, ixgbe and ixgbevf driver is
> > > > > loaded successfully but driver prints error when I try to do
> > > > > 'ifup'.
> > > > >
> > > > > "PF still in reset state".
> > > > >
> > > > > While debugging it I found one important article from Intel
> > > > > community site,
> > > > >
> > > > > http://communities.intel.com/message/158673#158673
> > > > >
> > > > > I realized Intel 82599 require MSI-X for SR-IOV not MSI, but
> the
> > > > > ARM SoC only support MSI.
> > > > > What I want to know is if it is possible to activate SR-IOV
> with
> > > > > MSI (not MSI- X). I know ixgbevf officially doesn't support MSI
> > > > > for SR-
> > > > IOV
> > > > > but I just want to use it for experimental test on the ARM
> > > > > environment. According to the article, it seems there was no
> > > > > hardware limitation which prevent the use of MSI. If so, can I
> > > > > make work SR-IOV using MSI instead of MSI-X by little re- work
> > > > > ixgbevf(or ixgbe
> > > > also) driver?
> > > > >
> > > > > Please shed some light on this.
> > > > >
> > > > > Best regards,
> > > > > Minho Ban
> > > > >
> > > > > SAMSUNG Electronics, Co., Ltd.
> > > > > (Office) +82-31-301-8489=A0 (Mobile) +82-10-8725-8864
> > > > >
> > > > >
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