[dpdk-dev] [PATCH v2] doc: announce ABI change for mbuf structure

Ananyev, Konstantin konstantin.ananyev at intel.com
Wed Jul 27 11:34:32 CEST 2016



> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Olivier Matz
> Sent: Wednesday, July 20, 2016 8:16 AM
> To: dev at dpdk.org
> Cc: jerin.jacob at caviumnetworks.com; thomas.monjalon at 6wind.com; Richardson, Bruce <bruce.richardson at intel.com>
> Subject: [dpdk-dev] [PATCH v2] doc: announce ABI change for mbuf structure
> 
> For 16.11, the mbuf structure will be modified implying ABI breakage.
> Some discussions already took place here:
> http://www.dpdk.org/dev/patchwork/patch/12878/
> 
> Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
> ---
> 
> v1->v2:
> - reword the sentences to keep things more open, as suggested by Bruce
> 
>  doc/guides/rel_notes/deprecation.rst | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> index f502f86..b9f5a93 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -41,3 +41,9 @@ Deprecation Notices
>  * The mempool functions for single/multi producer/consumer are deprecated and
>    will be removed in 16.11.
>    It is replaced by rte_mempool_generic_get/put functions.
> +
> +* ABI changes are planned for 16.11 in the ``rte_mbuf`` structure: some fields
> +  may be reordered to facilitate the writing of ``data_off``, ``refcnt``, and
> +  ``nb_segs`` in one operation, because some platforms have an overhead if the
> +  store address is not naturally aligned. Other mbuf fields, such as the
> +  ``port`` field, may be moved or removed as part of this mbuf work.
> --

Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
> 2.8.1



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