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From: Ginés García Avilés <gines.garcia@i2cat.net>
To: "Chautru, Nicolas" <nicolas.chautru@intel.com>
Cc: "users@dpdk.org" <users@dpdk.org>
Subject: Re: [test-bbdev] Custom test-vector
Date: Thu, 11 Nov 2021 17:12:53 +0100
Message-ID: <CAFggs4OLvh2qTxKQ9cDSaHN9C1Jnw9OoQA6KqqG1zy-MZPV-gQ@mail.gmail.com> (raw)
In-Reply-To: <BY5PR11MB4451FDF8E852E2DBBECED234F8949@BY5PR11MB4451.namprd11.prod.outlook.com>

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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.chautru@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.garcia@i2cat.net>
> *Sent:* Thursday, November 11, 2021 12:23 AM
> *To:* Chautru, Nicolas <nicolas.chautru@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.chautru@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.garcia@i2cat.net>
> *Sent:* Wednesday, November 10, 2021 4:28 AM
> *To:* users@dpdk.org
> *Cc:* Chautru, Nicolas <nicolas.chautru@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.
>
>

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      reply	other threads:[~2021-11-11 16:13 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-10 12:28 Ginés García Avilés
2021-11-10 18:21 ` Chautru, Nicolas
2021-11-11  8:22   ` Ginés García Avilés
2021-11-11 15:17     ` Chautru, Nicolas
2021-11-11 16:12       ` Ginés García Avilés [this message]

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