[virtio-comment] Re: [PATCH v4 1/7] transport-fabrics: introduce Virtio Over Fabrics overview

[Stefan Hajnoczi <stefanha@redhat.com>]

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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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