[dpdk-dev] [PATCH v2] doc: announce adoption of C11 atomic operations semantics

Ananyev, Konstantin konstantin.ananyev at intel.com
Fri May 22 10:37:05 CEST 2020


> 
> As agreed in the DPDK tech board [1], after 20.05 release, patches must
> use C11 atomic operations semantics with the help of wrappers.
> 
> [1] http://mails.dpdk.org/archives/dev/2020-April/165143.html
> 
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Reviewed-by: Phil Yang <phil.yang at arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
> Acked-by: Hemant Agrawal <hemant.agrawal at nxp.com>
> Acked-by: Jerin Jacob <jerinj at marvell.com>
> ---
>  doc/guides/rel_notes/deprecation.rst | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index 20aa745b7..01f99a0d6 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -113,3 +113,16 @@ Deprecation Notices
>    Python 2 support will be completely removed in 20.11.
>    In 20.08, explicit deprecation warnings will be displayed when running
>    scripts with Python 2.
> +
> +* rte_atomicNN_xxx: These APIs do not take memory order parameter. This does
> +  not allow for writing optimized code for all the CPU architectures supported
> +  in DPDK. DPDK will adopt C11 atomic operations semantics and provide wrappers
> +  using C11 atomic built-ins. These wrappers must be used for patches that
> +  need to be merged in 20.08 onwards. This change will not introduce any
> +  performance degradation.
> +
> +* rte_smp_*mb: These APIs provide full barrier functionality. However, many
> +  use cases do not require full barriers. To support such use cases, DPDK will
> +  adopt C11 barrier semantics and provide wrappers using C11 atomic built-ins.
> +  These wrappers must be used for patches that need to be merged in 20.08
> +  onwards. This change will not introduce any performance degradation.
> --

Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>

> 2.17.1



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