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Subject: Re: [virtio-comment] [PATCH v8 4/8] transport-mmio: Refer to the vq by its number
Parav Pandit <parav@nvidia.com> writes: > Currently specification uses virtqueue index and > number interchangeably to refer to the virtqueue. > > Instead refer to it by its number. > > Fixes: https://github.com/oasis-tcs/virtio-spec/issues/163 > Reviewed-by: Jiri Pirko <jiri@nvidia.com> > Signed-off-by: Parav Pandit <parav@nvidia.com> > > --- > changelog: > v6->v7: > - remove text around first vq as it is already covered in the basic > virtqueues facility section > --- > transport-mmio.tex | 21 ++++++++------------- > 1 file changed, 8 insertions(+), 13 deletions(-) > > diff --git a/transport-mmio.tex b/transport-mmio.tex > index 3047633..2aa6627 100644 > --- a/transport-mmio.tex > +++ b/transport-mmio.tex > @@ -108,13 +108,12 @@ \subsection{MMIO Device Register Layout}\label{sec:Virtio Transport Options / Vi > bits accessible by writing to \field{DriverFeatures}. > } > \hline > - \mmioreg{QueueSel}{Virtual queue index}{0x030}{W}{% > + \mmioreg{QueueSel}{Virtual queue number}{0x030}{W}{% > Writing to this register selects the virtual queue that the > following operations on \field{QueueSizeMax}, > \field{QueueSize}, \field{QueueReady}, > \field{QueueDescLow}, \field{QueueDescHigh}, \field{QueueDriverlLow}, \field{QueueDriverHigh}, > - \field{QueueDeviceLow}, \field{QueueDeviceHigh} and \field{QueueReset} apply to. The index > - number of the first queue is zero (0x0). > + \field{QueueDeviceLow}, \field{QueueDeviceHigh} and \field{QueueReset} apply to. > } > \hline > \mmioreg{QueueSizeMax}{Maximum virtual queue size}{0x034}{R}{% > @@ -149,7 +148,7 @@ \subsection{MMIO Device Register Layout}\label{sec:Virtio Transport Options / Vi > there are new buffers to process in a queue. > > When VIRTIO_F_NOTIFICATION_DATA has not been negotiated, > - the value written is the queue index. > + the value written is the queue number. Should "queue number" become "virtqueue number" everywhere? Perhaps the introduction should indicate that "queue number" is another term for "virtqueue number". > > When VIRTIO_F_NOTIFICATION_DATA has been negotiated, > the \field{Notification data} value has the following format: > @@ -363,8 +362,7 @@ \subsubsection{Virtqueue Configuration}\label{sec:Virtio Transport Options / Vir > The driver will typically initialize the virtual queue in the following way: > > \begin{enumerate} > -\item Select the queue writing its index (first queue is 0) to > - \field{QueueSel}. > +\item Select the queue writing its number to \field{QueueSel}. s/queue/queue by/ > > \item Check if the queue is not already in use: read \field{QueueReady}, > and expect a returned value of zero (0x0). > @@ -392,7 +390,7 @@ \subsubsection{Available Buffer Notifications}\label{sec:Virtio Transport Option > > When VIRTIO_F_NOTIFICATION_DATA has not been negotiated, > the driver sends an available buffer notification to the device by writing > -the 16-bit virtqueue index > +the 16-bit virtqueue number > of the queue to be notified to \field{QueueNotify}. > > When VIRTIO_F_NOTIFICATION_DATA has been negotiated, > @@ -470,13 +468,11 @@ \subsection{Legacy interface}\label{sec:Virtio Transport Options / Virtio Over M > (see QueuePFN). > } > \hline > - \mmioreg{QueueSel}{Virtual queue index}{0x030}{W}{% > + \mmioreg{QueueSel}{Virtual queue number}{0x030}{W}{% > Writing to this register selects the virtual queue that the > following operations on the \field{QueueSizeMax}, > \field{QueueSize}, \field{QueueAlign} > - and \field{QueuePFN} registers apply to. The index > - number of the first queue is zero (0x0). > -. > + and \field{QueuePFN} registers apply to. > } > \hline > \mmioreg{QueueSizeMax}{Maximum virtual queue size}{0x034}{R}{% > @@ -550,8 +546,7 @@ \subsection{Legacy interface}\label{sec:Virtio Transport Options / Virtio Over M > > The virtual queue is configured as follows: > \begin{enumerate} > -\item Select the queue writing its index (first queue is 0) to > - \field{QueueSel}. > +\item Select the queue writing its number to \field{QueueSel}. s/queue/queue by/ > > \item Check if the queue is not already in use: read \field{QueuePFN}, > expecting a returned value of zero (0x0). > -- > 2.26.2 > > > This publicly archived list offers a means to provide input to the > OASIS Virtual I/O Device (VIRTIO) TC. > > In order to verify user consent to the Feedback License terms and > to minimize spam in the list archive, subscription is required > before posting. > > Subscribe: virtio-comment-subscribe@lists.oasis-open.org > Unsubscribe: virtio-comment-unsubscribe@lists.oasis-open.org > List help: virtio-comment-help@lists.oasis-open.org > List archive: https://lists.oasis-open.org/archives/virtio-comment/ > Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf > List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lists > Committee: https://www.oasis-open.org/committees/virtio/ > Join OASIS: https://www.oasis-open.org/join/ -- I move with the movement and I have the touch.
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