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Subject: Re: [PATCH v2 1/6] notifications: unify notifications wording in core
On Mon, Jun 11, 2018 at 06:11:53PM +0200, Halil Pasic wrote: > @@ -65,11 +65,12 @@ in which their processing is complete. > > The Device Event Suppression data structure is write-only by the > device. It includes information for reducing the number of > -device events - i.e. driver notifications to device. > +device events - i.e. sending an available buffer notification > +to the device. > > The Driver Event Suppression data structure is read-only by the > device. It includes information for reducing the number of > -driver events - i.e. device interrupts to driver. > +driver events - i.e. send a used buffer notification to the driver. This makes the "i.e." more natural: "sending fewer used buffer notifications to the driver" because the "send a used buffer notification to the driver" phrase doesn't directly relate to any preceding subphrase ("driver events", "number of driver events", or "reducing the number of driver events"). > > \subsection{Driver and Device Ring Wrap Counters} > \label{sec:Packed Virtqueues / Driver and Device Ring Wrap Counters} > @@ -309,22 +310,20 @@ in the ring. > > \subsection{Driver and Device Event Suppression} > \label{sec:Packed Virtqueues / Driver and Device Event Suppression} > -In many systems driver and device notifications involve > +In many systems used and available buffer notifications involve > significant overhead. To mitigate this overhead, > each virtqueue includes two identical structures used for > controlling notifications between the device and the driver. > > The Driver Event Suppression structure is read-only by the > -device and controls the events sent by the device > -to the driver (e.g. interrupts). > +device and controls the used buffer notifications (sent by the device > +to the driver). > > The Device Event Suppression structure is read-only by > -the driver and controls the events sent by the driver > -to the device (e.g. IO). > +the driver and controls the available buffer notifications (sent by the > +driver to the device). > > -Each of these Event Suppression structures controls > -both Descriptor Ring events and structure events, and > -each includes the following fields: > +Each of these Event Suppression includes the following fields: Something is missing, "these" is plural but Event Suppression is singular: Each of these Event Suppression structures ... > Otherwise, if the VIRTIO_F_EVENT_IDX feature bit is negotiated: > \begin{itemize} > \item The driver MUST set \field{flags} to 0. > -\item The driver MAY use \field{used_event} to advise the device that interrupts are unnecessary until the device writes entry with an index specified by \field{used_event} into the used ring (equivalently, until \field{idx} in the > +\item The driver MAY use \field{used_event} to advise the device that > +notifications are unnecessary until the device writes entry with an index specified by \field{used_event} into the used ring (equivalently, until \field{idx} in the Pre-existing issue: the device writes *an* entry > @@ -562,8 +570,8 @@ The driver offers buffers to one of the device's virtqueues as follows: > \item The driver performs a suitable memory barrier to ensure that it updates > the \field{idx} field before checking for notification suppression. > > -\item If notifications are not suppressed, the driver notifies the device > - of the new available buffers. > +\item The driver sends an available buffers notification to the device if > + such notifications are not suppressed. For consistency: s/available buffers notification/available buffer notification/
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