[dpdk-dev] [PATCH] doc: announce control mbuf removal

[Dumitrescu, Cristian]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Olivier Matz
> Sent: Monday, February 12, 2018 10:22 AM
> To: dev at dpdk.org; Neil Horman <nhorman at tuxdriver.com>; Mcnamara,
> John <john.mcnamara at intel.com>; Kovacevic, Marko
> <marko.kovacevic at intel.com>
> Cc: Kevin Wilson <wkevils at gmail.com>; Ananyev, Konstantin
> <konstantin.ananyev at intel.com>
> Subject: Re: [dpdk-dev] [PATCH] doc: announce control mbuf removal
> 
> Hi,
> 
> Please, any other comments or acks for this one?
> 
> Thanks
> Olivier
> 
> 
> On Mon, Jan 29, 2018 at 10:30:27AM +0100, Olivier Matz wrote:
> > Link: http://dpdk.org/ml/archives/dev/2017-July/069813.html
> > Link: http://dpdk.org/dev/patchwork/patch/32041/
> >
> > Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>

Acked-by: Cristian Dumitrescu <cristian.dumitrescu at intel.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 d59ad5988..e98ce6a0a 100644
> > --- a/doc/guides/rel_notes/deprecation.rst
> > +++ b/doc/guides/rel_notes/deprecation.rst
> > @@ -59,3 +59,16 @@ Deprecation Notices
> >    be added between the producer and consumer structures. The size of the
> >    structure and the offset of the fields will remain the same on
> >    platforms with 64B cache line, but will change on other platforms.
> > +
> > +* mbuf: The control mbuf API will be removed in v18.05. The impacted
> > +  functions and macros are:
> > +
> > +  - ``rte_ctrlmbuf_init()``
> > +  - ``rte_ctrlmbuf_alloc()``
> > +  - ``rte_ctrlmbuf_free()``
> > +  - ``rte_ctrlmbuf_data()``
> > +  - ``rte_ctrlmbuf_len()``
> > +  - ``rte_is_ctrlmbuf()``
> > +  - ``CTRL_MBUF_FLAG``
> > +
> > +  The packet mbuf API should be used as a replacement.
> > --
> > 2.11.0
> >

We use control messages extensively in examples/ip_pipeline. Every time we needed control messages, we found that the control mbuf was too heavy and did not add any value, so we ended up creating custom data structures.