Regards, Bala On 15 June 2017 at 23:20, Honnappa Nagarahalli < honnappa.nagaraha...@linaro.org> wrote:
> On 15 June 2017 at 10:58, Bala Manoharan <bala.manoha...@linaro.org> > wrote: > > On 15 June 2017 at 20:00, Francois Ozog <francois.o...@linaro.org> > wrote: > > > >> I wonder then how packet receive in HW driven packet buffers is handled, > >> may be with device memory.... > >> > >> Can you explain the cases of packet receive with ODP application > supplied > >> (through packetio open) mempools? > >> > > > > There needs to be atleast one pool linked to a pktio interface and there > > can be more than one if application wants to configure different pools > for > > different flows. The configuration of the pool is given by the > application > > so that any traffic burst in a single flow does not overload the entire > > system processing for other flows. > > > > So when application configures a packet pool we allocate internal shared > > memory and pool allocator and link it to the pktio interface. When > packet > > is received in the pktio interface the packet is allocated from the > linked > > pool. > > When you say 'internal shared memory', do you mean the memory is > shared between the CPU cores and the hardware accelerators? I did not > understand the 'pool allocator'. My understanding from your earlier > email is that the pool is created (and all the packet buffers > instantiated) when odp_pool_create API is called and pool is linked to > the pktio in odp_pktio_open call. > 'pool allocator' is a HW module which basically holds list of pointers from a memory location and provides pointers when someone calls alloc from the pool. pool is created when you call odp_pool_create(). pktio is created with odp_pktio_open() which takes pool as an input argument. pool is linked to the pktio when you call odp_pktio_start() Hope its clear. Regards, Bala > > > > > Does this answer your question? > > > > Regards, > > Bala > > > >> > >> FF > >> > >> On 15 June 2017 at 15:42, Bala Manoharan <bala.manoha...@linaro.org> > >> wrote: > >> > >>> Add on. It is also possible that the pool might not be linked to any > pktio > >>> eg buffer pools, hence in implementation we can not wait for the pool > to > >>> be > >>> linked to pktio. > >>> > >>> Regards, > >>> Bala > >>> > >>> On 15 June 2017 at 18:11, Bill Fischofer <bill.fischo...@linaro.org> > >>> wrote: > >>> > >>> > A pool may be associated with a pktio at open time, but this > >>> > association is not exclusive. In theory an ODP implementation could > >>> > defer actual pool creation until it was first used, but such an > >>> > approach would be unlikely to yield any real benefits while creating > a > >>> > lot of complications along the way since odp_pool_create() is the > only > >>> > opportunity the implementation has to fail the pool creation in a > >>> > defined manner. > >>> > > >>> > On Thu, Jun 15, 2017 at 2:29 AM, Bala Manoharan > >>> > <bala.manoha...@linaro.org> wrote: > >>> > > Same here. Pool is created during odp_pool_create API. > >>> > > > >>> > > > >>> > > Regards, > >>> > > Bala > >>> > > > >>> > > On 15 June 2017 at 12:36, Nikhil Agarwal <nikhil.agar...@nxp.com> > >>> wrote: > >>> > > > >>> > >> Pool is created at odp_pool_create only. You can allocate packets > >>> form > >>> > it > >>> > >> even before pktio_open. > >>> > >> > >>> > >> Regards > >>> > >> Nikhil > >>> > >> > >>> > >> -----Original Message----- > >>> > >> From: lng-odp [mailto:lng-odp-boun...@lists.linaro.org] On > Behalf Of > >>> > >> Honnappa Nagarahalli > >>> > >> Sent: Thursday, June 15, 2017 9:27 AM > >>> > >> To: lng-odp-forward <lng-odp@lists.linaro.org> > >>> > >> Subject: [lng-odp] Mem pool creation in Cavium/NXP implementations > >>> > >> > >>> > >> Hi Bala/Nikhil, > >>> > >> I was wondering when is the memory pool created in your > >>> > implementation > >>> > >> of ODP? The programming model is that the application creates the > >>> memory > >>> > >> pool and passes that pool to the pkt I/O during packet I/O open > >>> call. Do > >>> > >> you actually create the pool when the application calls > >>> > odp_pool_create? Or > >>> > >> is the pool created during packet I/O open? > >>> > >> > >>> > >> Appreciate your answers. > >>> > >> > >>> > >> Thank you, > >>> > >> Honnappa > >>> > >> > >>> > > >>> > >> > >> > >> > >> -- > >> [image: Linaro] <http://www.linaro.org/> > >> François-Frédéric Ozog | *Director Linaro Networking Group* > >> T: +33.67221.6485 > >> francois.o...@linaro.org | Skype: ffozog > >> > >> >
