Re: [dpdk-dev] [PATCH v4 2/3] doc: update armv8-a IO barrier changes

[Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>]

<snip>

> Subject: Re: [dpdk-dev] [PATCH v4 2/3] doc: update armv8-a IO barrier
> changes
> 
> On Tue, Jul 7, 2020 at 1:44 AM Honnappa Nagarahalli
> <honnappa.nagarahalli@arm.com> wrote:
> >
> > Updated the use of DMB instruction in rte_*mb APIs for Armv8-a.
> >
> > Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> > Acked-by: Jerin Jacob <jerinj@marvell.com>
> > ---
> >  doc/guides/rel_notes/release_20_08.rst | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/doc/guides/rel_notes/release_20_08.rst
> > b/doc/guides/rel_notes/release_20_08.rst
> > index 5cbc4ce14..567ae6b2a 100644
> > --- a/doc/guides/rel_notes/release_20_08.rst
> > +++ b/doc/guides/rel_notes/release_20_08.rst
> > @@ -56,6 +56,13 @@ New Features
> >       Also, make sure to start the actual text at the margin.
> >       =========================================================
> >
> 
> This release note update will be squashed with the change itself in patch 1.
> 
> > +* **rte_*mb APIs are updated to use DMB instruction for Armv8-a.**
> 
> We use "ARMv8" in the release notes, any objection if I update this when
> applying?
No objections.

> 
> 
> > +
> > +  Armv8-a memory model has been strengthened to require
> > + other-multi-copy  atomicity. This allows for using DMB instruction
> > + instead of DSB for IO  barriers. rte_*mb APIs, for Armv8-a
> > + platforms, are changed to use DMB  instruction to reflect this.
> > +
> >  * **Updated PCAP driver.**
> >
> >    Updated PCAP driver with new features and improvements, including:
> > --
> > 2.17.1
> >
> 
> 
> --
> David Marchand