[virtio-dev] Re: [PATCH v6 1/3] virtio: introduce virtqueue reset as basic facility

[Cornelia Huck <cohuck@redhat.com>]

On Fri, Oct 15 2021, Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote:

> This patch allows the driver to reset a queue individually.
>
> This is very common on general network equipment. By disabling a queue,
> you can quickly reclaim the buffer currently on the queue. If necessary,
> we can reinitialize the queue separately.
>
> For example, when virtio-net implements support for AF_XDP, we need to
> disable a queue to release all the original buffers when AF_XDP setup.
> And quickly release all the AF_XDP buffers that have been placed in the
> queue when AF_XDP exits.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> ---
>  content.tex | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>

(...)

> +\devicenormative{\paragraph}{Virtqueue Reset}{Basic Facilities of a Virtio Device / Virtqueues / Virtqueue Reset / Virtqueue Reset}
> +
> +After a queue has been reset by the driver, the device MUST NOT execute
> +any requests from that virtqueue, or notify the driver for it.
> +
> +The device MUST reset any state of a virtqueue to be reset to the default state,

s/to be reset//

> +including the available state and the used state.

(...)


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