3. SW Turbo Poll Mode Driver
The SW Turbo PMD (baseband_turbo_sw) provides a software only poll mode bbdev driver that can optionally utilize Intel optimized libraries for LTE and 5GNR Layer 1 workloads acceleration.
Note that the driver can also be built without any dependency with reduced functionality for maintenance purpose.
To enable linking to the SDK libraries see detailed installation section below.
This PMD supports the functions: FEC, Rate Matching and CRC functions detailed in the Features section.
SW Turbo PMD can support for the following capabilities when the SDK libraries are used:
For the LTE encode operation:
For the LTE decode operation:
For the 5G NR LDPC encode operation:
For the 5G NR LDPC decode operation:
- In-place operations for encode and decode are not supported
3.3.1. FlexRAN SDK Download
As an option it is possible to link this driver with FleXRAN SDK libraries which can enable real time signal processing using AVX instructions.
These libraries are available through this link.
After download is complete, the user needs to unpack and compile on their system before building DPDK.
The following table maps DPDK versions with past FlexRAN SDK releases:
|DPDK version||FlexRAN FEC SDK release|
3.3.2. FlexRAN SDK Installation
Note that the installation of these libraries is optional.
- The following are pre-requisites for building FlexRAN SDK Libraries:
- An AVX2 or AVX512 supporting machine
- CentOS Linux release 7.2.1511 (Core) operating system is advised
- Intel ICC 18.0.1 20171018 compiler or more recent and related libraries ICC is available with a free community license.
The following instructions should be followed in this exact order:
Set the environment variables:
source <path-to-icc-compiler-install-folder>/linux/bin/compilervars.sh intel64 -platform linux
Run the SDK extractor script and accept the license:
cd <path-to-workspace> ./FlexRAN-FEC-SDK-19-04.sh
Generate makefiles based on system configuration:
cd <path-to-workspace>/FlexRAN-FEC-SDK-19-04/sdk/ ./create-makefiles-linux.sh
A build folder is generated in this form
build-<ISA>-<CC>, enter that folder and install:
cd build-avx512-icc/ make && make install
In order to enable this virtual bbdev PMD, the user may:
- Build the
FLEXRAN SDKlibraries (explained in Installation section).
- Export the environmental variables
FLEXRAN_SDKto the path where the FlexRAN SDK libraries were installed. And
DIR_WIRELESS_SDKto the path where the libraries were extracted.
- Tune the meson build option pointing the location of the FlexRAN SDK libraries
export FLEXRAN_SDK=<path-to-workspace>/FlexRAN-FEC-SDK-19-04/sdk/build-avx2-icc/install export DIR_WIRELESS_SDK=<path-to-workspace>/FlexRAN-FEC-SDK-19-04/sdk/build-avx2-icc/ cd build meson configure -Dflexran_sdk=<path-to-workspace>/FlexRAN-FEC-SDK-19-04/sdk/build-avx512-icc/install
- For AVX512 machines with SDK libraries installed then both 4G and 5G can be enabled for full real time FEC capability. For AVX2 machines it is possible to only enable the 4G libraries and the PMD capabilities will be limited to 4G FEC. If no library is present then the PMD driver will still build but its capabilities will be limited accordingly.
To use the PMD in an application, user must:
rte_vdev_init("baseband_turbo_sw")within the application.
--vdev="baseband_turbo_sw"in the EAL options, which will call
The following parameters (all optional) can be provided in the previous two calls:
socket_id: Specify the socket where the memory for the device is going to be allocated (by default, socket_id will be the socket where the core that is creating the PMD is running on).
max_nb_queues: Specify the maximum number of queues in the device (default is
./test-bbdev.py -e="--vdev=baseband_turbo_sw,socket_id=0,max_nb_queues=8" \ -c validation -v ./turbo_*_default.data