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Subject: Re: [PATCH v2] content: support SR-IOV
On Tue, May 22, 2018 at 11:56:12AM +0200, Cornelia Huck wrote: > On Tue, 22 May 2018 12:56:23 +0800 > Tiwei Bie <tiwei.bie@intel.com> wrote: > > > Allocate a feature bit for virtio devices which support SR-IOV. > > > > Suggested-by: Michael S. Tsirkin <mst@redhat.com> > > Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> > > Fixes: https://github.com/oasis-tcs/virtio-spec/issues/11 > > --- > > More details can be found from this thread: > > https://patchwork.kernel.org/patch/10285541/ > > > > This patch needs below patch applied first: > > https://github.com/oasis-tcs/virtio-spec/issues/10 > > https://lists.oasis-open.org/archives/virtio-dev/201805/msg00046.html > > > > v1 -> v2: > > - s/Reserve/Allocate/ (MST); > > - Add a Fixes tag (MST); > > - Be more explicit in driver requirement (MST); > > - Remove the "device MAY fail" description (MST); > > - Rebase on IO_BARRIER patch; > > > > RFC -> v1: > > - Mention PCI in the description (Cornelia); > > > > content.tex | 15 +++++++++++++-- > > 1 file changed, 13 insertions(+), 2 deletions(-) > > > > diff --git a/content.tex b/content.tex > > index 95c243f..1c23274 100644 > > --- a/content.tex > > +++ b/content.tex > > @@ -95,10 +95,10 @@ Feature bits are allocated as follows: > > \begin{description} > > \item[0 to 23] Feature bits for the specific device type > > > > -\item[24 to 36] Feature bits reserved for extensions to the queue and > > +\item[24 to 37] Feature bits reserved for extensions to the queue and > > feature negotiation mechanisms > > > > -\item[37 and above] Feature bits reserved for future extensions. > > +\item[38 and above] Feature bits reserved for future extensions. > > \end{description} > > > > \begin{note} > > @@ -5357,6 +5357,9 @@ Descriptors} and \ref{sec:Packed Virtqueues / Indirect Flag: Scatter-Gather Supp > > better performance. This feature indicates whether > > a stronger form of barrier suitable for hardware > > devices is necessary. > > + \item[VIRTIO_F_SR_IOV(37)] This feature indicates that > > + the device supports Single Root I/O Virtualization. > > + Currently only virtio PCI devices support this feature. > > Nit: s/virtio PCI devices/PCI devices/ > > (I'd be fine with keeping 'virtio', though.) > > > \end{description} > > > > \drivernormative{\section}{Reserved Feature Bits}{Reserved Feature Bits} > > @@ -5376,6 +5379,11 @@ A driver SHOULD accept VIRTIO_F_IO_BARRIER if it is offered. > > If VIRTIO_F_IO_BARRIER has been negotiated, a driver MUST use > > the barriers suitable for hardware devices. > > > > +A driver SHOULD accept VIRTIO_F_SR_IOV if it is offered. > > +If VIRTIO_F_SR_IOV has been negotiated, a driver can > > +enable virtual functions through device's PCI SR-IOV > > s/device's/the device's/ > > > +capability structure. > > + > > \devicenormative{\section}{Reserved Feature Bits}{Reserved Feature Bits} > > > > A device MUST offer VIRTIO_F_VERSION_1. A device MAY fail to operate further > > @@ -5392,6 +5400,9 @@ buffers in the same order in which they have been available. > > A device MAY fail to operate further if VIRTIO_F_IO_BARRIER > > is not accepted. > > > > +A device SHOULD offer VIRTIO_F_SR_IOV if it presents a PCI > > +SR-IOV capability structure. > > + > > \section{Legacy Interface: Reserved Feature Bits}\label{sec:Reserved Feature Bits / Legacy Interface: Reserved Feature Bits} > > > > Transitional devices MAY offer the following: > > Else LGTM. Thank you very much for the review! :) Best regards, Tiwei Bie
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