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Subject: Re: [virtio-comment] [RFC PATCH] admin-queue: bind the group member to the device
On Tue, 27 Jun 2023 16:08:38 +0800, Jason Wang <jasowang@redhat.com> wrote: > On Mon, Jun 26, 2023 at 2:22âPM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > > > The VFs of the SR-IOV are created by the user inside the guest OS, so the virtio > > devices don't know about these VFs. Because each VF may be assigned a different role > > by the user, the virtio device can not choose one VF to bind random. > > So only the user knows how to bind the virtio devices to the VFs. > > On the other hand, generally the virtio devices are not created by the user > > inside the guest OS. This requires some management platform to participate. > > > > So the usage of this command: > > 1. The user purchases a virtio network card on the management platform, > > and sets the ip, queue number, etc. The user obtains the identity of > > the network card. > > Any reason we can't do this through IPC of software layers? As Parav pointed out, we may have some gaps on the term. I will post our case later. Thanks. > > Thanks > > > 2. The user creates a VF with echo 8 > sriov_numvfs > > 3. The user binds the net crad to a VF with identity through the command > > of the patch > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > > --- > > admin.tex | 41 ++++++++++++++++++++++++++++++++++++++++- > > 1 file changed, 40 insertions(+), 1 deletion(-) > > > > diff --git a/admin.tex b/admin.tex > > index 2efd4d7..64d0667 100644 > > --- a/admin.tex > > +++ b/admin.tex > > @@ -115,7 +115,8 @@ \subsection{Group administration commands}\label{sec:Basic Facilities of a Virti > > \hline \hline > > 0x0000 & VIRTIO_ADMIN_CMD_LIST_QUERY & Provides to driver list of commands supported for this group type \\ > > 0x0001 & VIRTIO_ADMIN_CMD_LIST_USE & Provides to device list of commands used for this group type \\ > > -0x0002 - 0x7FFF & - & Commands using \field{struct virtio_admin_cmd} \\ > > +0x0002 & VIRTIO_ADMIN_CMD_BIND_DEVICE & Bind the device to one group member \\ > > +0x0003 - 0x7FFF & - & Commands using \field{struct virtio_admin_cmd} \\ > > \hline > > 0x8000 - 0xFFFF & - & Reserved for future commands (possibly using a different structure) \\ > > \hline > > @@ -429,6 +430,44 @@ \subsection{Group administration commands}\label{sec:Basic Facilities of a Virti > > \field{VF Enable} refer to registers within the SR-IOV Extended > > Capability as specified by \hyperref[intro:PCIe]{[PCIe]}. > > > > +\subsubsection{Bind the device for member} > > + > > +The VFs of the SR-IOV are created by the user inside the guest OS, so the virtio > > +devices don't know about these VFs. Because each VF may be assigned a different role > > +by the user, the virtio device can not choose one VF to bind random. > > +So only the user knows how to bind the virtio devices to the VFs. > > +On the other hand, generally the virtio devices are not created by the user > > +inside the guest OS. This requires some management platform to participate. > > + > > +So we introduce a new admin queue command to bind the VFs and the virtio > > +devices. > > + > > +\begin{lstlisting} > > +struct virtio_admin_cmd_bind { > > + u64 identity; > > +}; > > +\end{lstlisting} > > + > > +The user got the \field{identity} from the management platform, that is not > > +included by this spec. > > + > > +\drivernormative{\paragraph}{Group administration commands}{Basic Facilities of a Virtio Device / Device groups / Group administration commands / Bind the device for member} > > + > > +VIRTIO_ADMIN_CMD_BIND_DEVICE requires that the \field{group_member_id} MUST be set. > > + > > +The \field{identity} is passed by the user. It is the identity of the virtio > > +device. > > + > > +\devicenormative{\paragraph}{Group administration commands}{Basic Facilities of a Virtio Device / Device groups / Group administration commands / Bind the device for member} > > + > > +Every device MUST have one unique \field{identity} in the host. > > + > > +If the PF device can not find the device by the \field{identity}, > > +the \field{status} MUST be set to VIRTIO_ADMIN_STATUS_EINVAL. > > + > > +If the device is found by the \field{identity}, the device MUST work as the > > +device of this group member specified by the \field{group_member_id}. > > + > > \section{Administration Virtqueues}\label{sec:Basic Facilities of a Virtio Device / Administration Virtqueues} > > > > An administration virtqueue of an owner device is used to submit > > -- > > 2.32.0.3.g01195cf9f > > > > > > This publicly archived list offers a means to provide input to the > > OASIS Virtual I/O Device (VIRTIO) TC. > > > > In order to verify user consent to the Feedback License terms and > > to minimize spam in the list archive, subscription is required > > before posting. > > > > Subscribe: virtio-comment-subscribe@lists.oasis-open.org > > Unsubscribe: virtio-comment-unsubscribe@lists.oasis-open.org > > List help: virtio-comment-help@lists.oasis-open.org > > List archive: https://lists.oasis-open.org/archives/virtio-comment/ > > Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf > > List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lists > > Committee: https://www.oasis-open.org/committees/virtio/ > > Join OASIS: https://www.oasis-open.org/join/ > > >
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