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Subject: Re: [PATCH v1] virtio-net: Improve introductory description
On Wed, Feb 01, 2023 at 11:17:52AM +0100, Cornelia Huck wrote: > On Mon, Jan 23 2023, Parav Pandit <parav@nvidia.com> wrote: > > > The control VQ of the virtio network device is used beyond advance > > steering control. The control VQ dynamically changes multiple features > > of the initialized device. > > > > Hence, update this area of control VQ introductory description at few > > places and also place the link to its description. > > > > Also update the introduction section to better describe receive and > > transmit virtqueues. > > > > Fixes: https://github.com/oasis-tcs/virtio-spec/issues/156 > > Can you maybe also tweak the description in the github issue, as it is > not only about the controlq anymore? > > > Signed-off-by: Parav Pandit <parav@nvidia.com> > > --- > > This patch is on top of [1]. > > > > [1] https://lists.oasis-open.org/archives/virtio-dev/202301/msg00280.html > > --- > > changelog: > > v0->v1: > > - replaced command queue to control virtqueue to reflect current state > > - added link of control vq to its detailed section > > - removed reference of cvq from more places that limits it to steering > > - Addressed Cornelia's review comments: > > - updated introduction section to better describe rq, sq, cvq. > > - explicitly wrote that cvq is optional along with its feature bit > > related description > > - dropped few items from Cornelia's review as they do not exactly > > fit with latest 1.2 specification as below. > > - avoided listing number of queues in introduction as its linked to q > > reset which can disable all queues > > - avoid mentioning cvq as optional as there is better section for it > > - avoid talking about queue pairs as spec and use cases allows not > > operate in pairs mode > > --- > > device-types/net/description.tex | 20 ++++++++++---------- > > 1 file changed, 10 insertions(+), 10 deletions(-) > > > > diff --git a/device-types/net/description.tex b/device-types/net/description.tex > > index e1341e6..e32780b 100644 > > --- a/device-types/net/description.tex > > +++ b/device-types/net/description.tex > > @@ -2,13 +2,13 @@ \section{Network Device}\label{sec:Device Types / Network Device} > > > > The virtio network device is a virtual network interface controller. > > It consists of a virtual Ethernet link which connects the device > > -to the Ethernet network. It is the most complex of the devices > > -supported so far by virtio. It has enhanced rapidly and demonstrates > > -clearly how support for new features are added to an existing > > -device. Empty buffers are placed in one virtqueue for receiving > > -packets, and outgoing packets are enqueued into another for > > -transmission in that order. A third command queue is used to > > -control advanced filtering features. > > +to the Ethernet network. The driver posts empty buffers in a > > +receive virtqueue. The device receives the incoming packets from the link; > > +the device places these incoming packets in a receive virtqueue buffers. > > "and places these incoming packets into receive virtqueue buffers." ? into the receive virtqueue buffers? > > +The driver enqueues outgoing packets to a transmit virtqueue. The device > > +dequeues packets from the transmit virtqueue and sends packets to > > +the link. > > "and sends these packets to the link." ? or rather "dequeues these packets from the transmit virtqueue and sends them to the link". > > A control virtqueue is used to dynamically manipulate various > > +features of the initialized device. > > > > \subsection{Device ID}\label{sec:Device Types / Network Device / Device ID} > > > > @@ -28,7 +28,7 @@ \subsection{Virtqueues}\label{sec:Device Types / Network Device / Virtqueues} > > N=1 if neither VIRTIO_NET_F_MQ nor VIRTIO_NET_F_RSS are negotiated, otherwise N is set by > > \field{max_virtqueue_pairs}. > > > > - controlq only exists if VIRTIO_NET_F_CTRL_VQ set. > > +controlq is optional; it only exists if VIRTIO_NET_F_CTRL_VQ set. > > "it only exists if VIRTIO_NET_F_CTRL_VQ is set" ? Right. And as long as we are changing this: feature negotiation happens before vq discovery so I feel we can safely say "negotiated" here. > > > > \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits} > > > > @@ -389,8 +389,8 @@ \subsection{Device Operation}\label{sec:Device Types / Network Device / Device O > > }; > > \end{lstlisting} > > > > -The controlq is used to control device features such as > > -filtering. > > +The controlq is used to control many device features listed further in > > s/listed/described/ ? > > > +section \ref{sec:Device Types / Network Device / Device Operation / Control Virtqueue}. > > > > \subsubsection{Legacy Interface: Device Operation}\label{sec:Device Types / Network Device / Device Operation / Legacy Interface: Device Operation} > > When using the legacy interface, transitional devices and drivers > > -- > > 2.26.2
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