2. NXP DPAA2 QDMA Driver

The DPAA2 QDMA is an implementation of the rawdev API, that provide means to initiate a DMA transaction from CPU. The initiated DMA is performed without CPU being involved in the actual DMA transaction. This is achieved via using the DPDMAI device exposed by MC.

More information can be found at NXP Official Website.

2.1. Features

The DPAA2 QDMA implements following features in the rawdev API;

  • Supports issuing DMA of data within memory without hogging CPU while performing DMA operation.
  • Supports configuring to optionally get status of the DMA translation on per DMA operation basis.

2.2. Supported DPAA2 SoCs

  • LX2160A
  • LS2084A/LS2044A
  • LS2088A/LS2048A
  • LS1088A/LS1048A

2.3. Prerequisites

See NXP QorIQ DPAA2 Board Support Package for setup information

Currently supported by DPDK:

  • NXP SDK 19.03+.
  • MC Firmware version 10.14.0 and higher.
  • Supported architectures: arm64 LE.
  • Follow the DPDK Getting Started Guide for Linux to setup the basic DPDK environment.

Note

Some part of fslmc bus code (mc flib - object library) routines are dual licensed (BSD & GPLv2).

2.4. Pre-Installation Configuration

2.4.1. Config File Options

The following options can be modified in the config file.

  • CONFIG_RTE_LIBRTE_PMD_DPAA2_QDMA_RAWDEV (default y)

    Toggle compilation of the lrte_pmd_dpaa2_qdma driver.

2.5. Enabling logs

For enabling logs, use the following EAL parameter:

./your_qdma_application <EAL args> --log-level=pmd.raw.dpaa2.qdma,<level>

Using pmd.raw.dpaa2.qdma as log matching criteria, all Event PMD logs can be enabled which are lower than logging level.

2.5.1. Driver Compilation

To compile the DPAA2 QDMA PMD for Linux arm64 gcc target, run the following make command:

cd <DPDK-source-directory>
make config T=arm64-dpaa2-linux-gcc install

2.6. Initialization

The DPAA2 QDMA is exposed as a vdev device which consists of dpdmai devices. On EAL initialization, dpdmai devices will be probed and populated into the rawdevices. The rawdev ID of the device can be obtained using

  • Invoking rte_rawdev_get_dev_id("dpdmai.x") from the application where x is the object ID of the DPDMAI object created by MC. Use can use this index for further rawdev function calls.

2.6.1. Platform Requirement

DPAA2 drivers for DPDK can only work on NXP SoCs as listed in the Supported DPAA2 SoCs.