[PATCH] doc: announce mbuf fast free configuration requirements

[Thomas Monjalon]

15/07/2025 17:12, Konstantin Ananyev:
> 
> > For TX mbuf fast release offload, the mbuf mempool pointer will be added
> > to the ethdev tx queue configuration structure, so the ethdev TX burst
> > operation doesn't need to fetch it from the first mbuf of each burst being
> > fast free'd to the mempool.
> > 
> > Signed-off-by: Morten Brørup <mb at smartsharesystems.com>
> > ---
> >  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 e2d4125308..a7b4505a24 100644
> > --- a/doc/guides/rel_notes/deprecation.rst
> > +++ b/doc/guides/rel_notes/deprecation.rst
> > @@ -152,3 +152,9 @@ Deprecation Notices
> >  * bus/vmbus: Starting DPDK 25.11, all the vmbus API defined in
> >    ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.
> >    Those API functions are used internally by DPDK core and netvsc PMD.
> > +
> > +* ethdev: Configuring a transmit queue for fast mbuf release will
> > +  require specifying which mempool to free the mbufs to.
> > +  For this, a new field ``struct rte_mempool *mp_fast_free`` will be
> > +  added to ``struct rte_eth_txconf``, and must be set when the
> > +  ``RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE`` offload flag is set.
> > --
> 
> Acked-by: Konstantin Ananyev <konstantin.ananyev at huawei.com>

Looks like this new requirement is not encouraged a lot.

Per our policy, it will miss the release 25.07.