Hi Nicolas, thanks a lot for your help, I really appreciate it. I just started digging into the details, so it seems that I need to take a deeper look at the 3GPP processing chain :) Regarding your suggestion, could it be possible that the function you were pointing out is process_ldpc_dec_cb() within bbdev_turbo_software.c (just to be sure)?
Again, thanks a lot for your help. Regards, Ginés. El jue, 11 nov 2021 a las 16:18, Chautru, Nicolas (< nicolas.chau...@intel.com>) escribió: > Hi Gines, > > Note that the bblib_ldpc_decode_5gnr() function is doing purely the > decoder, while the bbdev implementation would include the full FEC > including the deRM as well. Are you familiar with 3gpp processing chain? > > You can look a the function process_ldpc_dec_cp() in > bbdev_turbo_software.c to see how the different SDK libraries are called to > implement the full bbdev api. > > Note that familiarity with 3GPP 5GNR standard is required > > https://doc.dpdk.org/guides/prog_guide/bbdev.html > > https://doc.dpdk.org/guides/bbdevs/turbo_sw.html > > https://doc.dpdk.org/guides/tools/testbbdev.html > > > > Thanks > > Nic > > > > *From:* Ginés García Avilés <gines.gar...@i2cat.net> > *Sent:* Thursday, November 11, 2021 12:23 AM > *To:* Chautru, Nicolas <nicolas.chau...@intel.com> > *Cc:* users@dpdk.org > *Subject:* Re: [test-bbdev] Custom test-vector > > > > Hi Nicolas, > > thanks a lot for your quick response. > > > > Basically, when passing the generated LLRs vector to > bblib_ldpc_decode_5gnr() > > (bblib_ldpc_decoder_5gnr_request request = {}; request.varNodes = > generated_llrs) > > it is able to decode it. > > However, converting the same vector to the bbdev format (from int8 vector > to uint32_t chain), > > bbdev throws RTE_BBDEV_SYNDROME_ERROR with the "iterationAtTermination" > variable always > > equals to the max number of iterations. > > > > Where could I find the documentation you are referring to? > > > > Thanks in advance! > > > > Regards, > > Ginés. > > > > El mié, 10 nov 2021 a las 19:22, Chautru, Nicolas (< > nicolas.chau...@intel.com>) escribió: > > Hi Gines, > > What do you mean by “flexran DPDK” vs “bbdev”? *“The generated LLRs > vector is directly decodable by flexRAN DPDK but when using it through * > > *Bbdev”* > > The format of the input/output data is defined in the documentation. > Basically 1 byte per LLR and captured in vectors with CPU endianness and > processing as per 3gpp. > > > > Thanks > > Nic > > > > *From:* Ginés García Avilés <gines.gar...@i2cat.net> > *Sent:* Wednesday, November 10, 2021 4:28 AM > *To:* users@dpdk.org > *Cc:* Chautru, Nicolas <nicolas.chau...@intel.com> > *Subject:* [test-bbdev] Custom test-vector > > > > Hi, > > I'm still trying to generate test vectors for the bbdev application within > > DPDK. More precisely, I want to create a test vector to run an LDPC > decoding operation. > > > > For that, I'm generating the LLRs with matlab (5G NR toolbox) as follows: > > 1) LDPC encoding + rate matching + modulation > > 2) Demodulation + rate recover > > > > The generated LLRs vector is directly decodable by flexRAN DPDK but when > using it through > > bbdev, it takes max iterations to decode, meaning that the decoding > process was > > unsuccessful. > > > > Any ideas/documentation about how to properly create the test vectors? > > > > PS: previous question here ( > https://mails.dpdk.org/archives/users/2021-October/005864.html) > > > > Regards, > > Ginés. > >
