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Subject: Re: [PATCH v4 1/7] transport-fabrics: introduce Virtio Over Fabrics overview
On Mon, Jun 26, 2023 at 03:25:45PM +0800, zhenwei pi wrote: > In the past years, virtio supports lots of device specifications by > PCI/MMIO/CCW. These devices work fine in the virtualization environment. > > Introduce Virtio Over Fabrics transport to support "network attached > peripheral devices". With this transport, Many Virtio based devices > work over fabrics. Note that the balloon device may not make sense, > shared memory regions won't work. > > Signed-off-by: zhenwei pi <pizhenwei@bytedance.com> > --- > content.tex | 1 + > transport-fabrics.tex | 32 ++++++++++++++++++++++++++++++++ > 2 files changed, 33 insertions(+) > create mode 100644 transport-fabrics.tex > > diff --git a/content.tex b/content.tex > index d2ab9eb..bbbd79e 100644 > --- a/content.tex > +++ b/content.tex > @@ -637,6 +637,7 @@ \chapter{Virtio Transport Options}\label{sec:Virtio Transport Options} > \input{transport-pci.tex} > \input{transport-mmio.tex} > \input{transport-ccw.tex} > +\input{transport-fabrics.tex} > > \chapter{Device Types}\label{sec:Device Types} > > diff --git a/transport-fabrics.tex b/transport-fabrics.tex > new file mode 100644 > index 0000000..d10be2a > --- /dev/null > +++ b/transport-fabrics.tex > @@ -0,0 +1,32 @@ > +\section{Virtio Over Fabrics}\label{sec:Virtio Transport Options / Virtio Over Fabrics} > + > +Virtio Over Fabrics (Virtio-oF) enables operations over fabrics that rely > +primarily on message passing. > + > +Virtio-oF uses a reliable connection to transmit data. The reliable > +connection facilitates communication between entities playing the following roles: > + > +\begin{itemize} > +\item A Virtio-oF initiator functions as a Virtio-oF client. > +The Virtio-oF initiator sends commands and associated data from the driver > +to the Virtio-oF target. > +\item A Virtio-oF target functions as a Virtio-oF server. > +The Virtio-oF target forwards commands to the device and sends completions > +and associated data back to the Virtio-oF initiator. > +\end{itemize} > + > +Virtio-oF has the following features: > + > +\begin{itemize} > +\item A Virtio-oF target is allowed to be connected by 0 or more Virtio-oF initiators. > +\item A Virtio-oF initiator is allowed to connect to a single Virtio-oF target only. > +A Virtio-oF device instance is a virtio device that the Virtio-oF initiator is > +accessing through the Virtio-oF target. Let's make sure the protocol is extensible so that multi-path or persistent sessions (support for reconnect) are possible in the future. They don't need to be there from the beginning. Stefan
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