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Subject: Re: [virtio-dev] Re: [PATCH v8 08/16] packed virtqueues: more efficient virtqueue layout
On Sun, Feb 25, 2018 at 08:49:10PM +0200, Michael S. Tsirkin wrote: > On Sat, Feb 24, 2018 at 01:17:08PM +0800, Tiwei Bie wrote: > > On Fri, Feb 16, 2018 at 09:24:12AM +0200, Michael S. Tsirkin wrote: [...] > > > +\subsection{Event Suppression Structure Format}\label{sec:Basic > > > +Facilities of a Virtio Device / Packed Virtqueues / Event Suppression Structure > > > +Format} > > > + > > > +The following structure is used to reduce the number of > > > +notifications sent between driver and device. > > > + > > > +\begin{lstlisting} > > > +__le16 desc_event_off : 15; /* Descriptor Event Offset */ > > > +int desc_event_wrap : 1; /* Descriptor Event Wrap Counter */ > > > > Is this `int` a typo? > > It's a single bit so I think it does not matter. > What type would you like me to use instead? It looks a bit strange to use different types here, and that's why I asked. If there is no particular reason to use `int` here, maybe it's better to keep using __le16. Besides, just for fun. For C language, I checked gcc and clang. It seems that `int desc_event_wrap:1;` is a signed type. So, e.g. `p->desc_event_wrap == 1` is always false. Best regards, Tiwei Bie > > > > +__le16 desc_event_flags : 2; /* Descriptor Event Flags */ > > > +\end{lstlisting} [...]
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