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Subject: Re: [PATCH v3] virtio-net: Improve introductory description
On Thu, Feb 09 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 > 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: > v2->v3: > - further improve introduction > v1->v2: > - corrected/added article before transmit and receive virtqueue > - replaced listed with described > - updated set to negotiated for CTRL_VQ > - improved introduction wordings > 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 | 23 +++++++++++++---------- > 1 file changed, 13 insertions(+), 10 deletions(-) > > diff --git a/device-types/net/description.tex b/device-types/net/description.tex > index 88a5770..bdf4810 100644 > --- a/device-types/net/description.tex > +++ b/device-types/net/description.tex > @@ -2,13 +2,15 @@ \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 device has transmit and receive > +queues. The driver posts empty buffers in the receive virtqueue. > +The device receives the incoming packets from the link; the device > +places these incoming packets in the receive virtqueue buffers. > +The driver enqueues outgoing packets to the transmit virtqueue. The device > +dequeues these packets from the transmit virtqueue and sends them to > +the link. The device may have a control virtuqueue. The driver typo: s/virtuqueue/virtqueue/ > +uses the control virtqueue to dynamically manipulate various > +features of the initialized device. > > \subsection{Device ID}\label{sec:Device Types / Network Device / Device ID}
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