Re: [test-bbdev] Custom test-vector

["Ginés García Avilés" <gines.garcia@i2cat.net>]

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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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