On Thu, 5 Aug 2021 15:27:15 +0200 "Medvedkin, Vladimir" <vladimir.medved...@intel.com> wrote:
> Hi Jan, > > The RIB is always used as a control plane struct intended to maintain > the correct content of the dataplane struct, such as DIR24_8 for > example. So it is always used on _add()/_delete(). For simplicity you > can consider it as an LPM's rule_info. But instead of keeping routes > in a plane array as it is in LPM, FIB uses RIB which is more suitable > binary tree. OK. I thought that I can have a single RIB, use it for maintaining routes and based on this single RIB, I can build a FIB for the data plane. And when the single RIB is updated (which can take quite a lot of time) I build a new FIB and locklessly give it to the dataplane. Such approach is not considered? Jan > > > On 05/08/2021 15:14, Jan Viktorin wrote: > > On Thu, 5 Aug 2021 15:08:13 +0200 > > Vladimir Medvedkin <vladimir.medved...@intel.com> wrote: > > > >> This patch announces the experimental tag removal of all fib APIs, > >> which have been experimental for 2 years. > >> API will be promoted to stable in DPDK 21.11 > > > > Hi Vladimir, > > > > I have a question related to FIB. I am just learning how to use it > > and I found that each FIB always creates a new RIB internally. > > There is no doc about this topic... > > > > If I understand correctly, the underlying RIB is only used when > > dummy_lookup() and dummy_modify() are used. But they are only used > > when the configured mode is RTE_FIB_DUMMY. Is there any reason to > > create the RIB with RTE_FIB_DIR24_8? > > > > The issue with this is that each RIB allocates a new mempool > > internally which can waste quite a lot of never used memory that > > would be unused with DIR24_8 implementation. > > > > Regards > > Jan > > > >> > >> > >> Signed-off-by: Vladimir Medvedkin <vladimir.medved...@intel.com> > >> --- > >> doc/guides/rel_notes/deprecation.rst | 2 ++ > >> 1 file changed, 2 insertions(+) > >> > >> diff --git a/doc/guides/rel_notes/deprecation.rst > >> b/doc/guides/rel_notes/deprecation.rst > >> index afb599a..58826a8 100644 > >> --- a/doc/guides/rel_notes/deprecation.rst > >> +++ b/doc/guides/rel_notes/deprecation.rst > >> @@ -195,3 +195,5 @@ Deprecation Notices > >> communicate events such as soft expiry with IPsec in lookaside > >> mode. > >> * rib: The ``rib`` library will be promoted from experimental to > >> stable. + > >> +* fib: The ``fib`` library will be promoted from experimental to > >> stable. >
