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?

 

 

Regards,

Ginés.