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Subject: [PATCH v1] content: support SR-IOV
Reserve 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> --- More details can be found from this thread: https://patchwork.kernel.org/patch/10285541/ 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 7a92cb1..9f981fb 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 33] Feature bits reserved for extensions to the queue and +\item[24 to 36] Feature bits reserved for extensions to the queue and feature negotiation mechanisms -\item[34 and above] Feature bits reserved for future extensions. +\item[37 and above] Feature bits reserved for future extensions. \end{description} \begin{note} @@ -5348,6 +5348,9 @@ Descriptors} and \ref{sec:Packed Virtqueues / Indirect Flag: Scatter-Gather Supp \item[VIRTIO_F_IN_ORDER(35)] This feature indicates that all buffers are used by the device in the same order in which they have been made available. + \item[VIRTIO_F_SR_IOV(36)] This feature indicates that + the device supports Single Root I/O Virtualization. + Currently only virtio PCI devices support this feature. \end{description} \drivernormative{\section}{Reserved Feature Bits}{Reserved Feature Bits} @@ -5363,6 +5366,10 @@ addresses to the device. A driver SHOULD accept VIRTIO_F_RING_PACKED if it is offered. +A driver SHOULD accept VIRTIO_F_SR_IOV if it is offered. +If VIRTIO_F_SR_IOV has been negotiated, a driver can +access device's PCI SR-IOV 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 @@ -5376,6 +5383,10 @@ accepted. If VIRTIO_F_IN_ORDER has been negotiated, a device MUST use buffers in the same order in which they have been available. +A device SHOULD offer VIRTIO_F_SR_IOV if it presents a PCI +SR-IOV capability structure. A device MAY fail to operate +further if VIRTIO_F_SR_IOV is not accepted. + \section{Legacy Interface: Reserved Feature Bits}\label{sec:Reserved Feature Bits / Legacy Interface: Reserved Feature Bits} Transitional devices MAY offer the following: -- 2.17.0
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