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

[David Marchand]

On Tue, Jul 7, 2020 at 1:44 AM Honnappa Nagarahalli
<honnappa.nagarahalli at arm.com> wrote:
>
> Updated the use of DMB instruction in rte_*mb APIs for Armv8-a.
>
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Acked-by: Jerin Jacob <jerinj at 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?


> +
> +  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