On 15 June 2017 at 13:02, Bala Manoharan <bala.manoha...@linaro.org> wrote: > > > 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. >
Thanks Bala. That is clear. Is the internal memory shared between CPUs and pktio device? > 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 >> >> >> >> > >
