On Tue, 23 Jan 2018 02:01:05 +0200
"Michael S. Tsirkin" <> wrote:
> Signed-off-by: Michael S. Tsirkin <>
> ---
> content.tex | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/content.tex b/content.tex
> index 9fc9673..5634c7d 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -1467,8 +1467,7 @@ All register values are organized as Little Endian.
> }
> \hline
> \mmioreg{QueueNum}{Virtual queue size}{0x038}{W}{%
> - Queue size is the number of elements in the queue, therefore in each
> - of the Descriptor Table, the Available Ring and the Used Ring.
> + Queue size is the number of elements in the queue.
> Writing to this register notifies the device what size of the
> queue the driver will use. This applies to the queue selected by
> writing to \field{QueueSel}.
> @@ -1491,9 +1490,9 @@ All register values are organized as Little Endian.
> caused the device interrupt to be asserted.
> The following events are possible:
> \begin{description}
> - \item[Used Ring Update] - bit 0 - the interrupt was asserted
> - because the device has updated the Used
> - Ring in at least one of the active virtual queues.
> + \item[Used Buffer Update] - bit 0 - the interrupt was asserted
> + because the device has used a buffer
> + in at least one of the active virtual queues.
> \item [Configuration Change] - bit 1 - the interrupt was
> asserted because the configuration of the device has changed.
> \end{description}
> @@ -1642,9 +1641,8 @@ The driver will typically initialize the virtual queue in the following way:
> \field{QueueNumMax}. If the returned value is zero (0x0) the
> queue is not available.
>
> -\item Allocate and zero the queue pages, making sure the memory
> - is physically contiguous. It is recommended to align the
> - Used Ring to an optimal boundary (usually the page size).
> +\item Allocate and zero the queue memory, making sure the memory
> + is physically contiguous.
What about recommendations of that type? Will we want some kind of
"best practice" suggestions (layout and/or transport specific?)
>
> \item Notify the device about the queue size by writing the size to
> \field{QueueNum}.
Reviewed-by: Cornelia Huck <>
