How to demonstrate LS1043A-VNP' DPAA function?

[d-z-c]

How to demonstrate  DPAA function on the LS1043A-VNP board?

I only refer to this manual: MPC-LS-VNP-RD-UM.pdf to burn the firmware: RDB-EAR0.1-Binaries

All the steps are same as the manual,except the dtb file.

One burn the default dtb file: fsl-ls1043a-rdb-sdk.dtb in  emmc block.the kernel boot logs and the rootfs ifconfig result are in this file: ls1043_vnp_without_dpaa_001.txt.   And the ifconfig result looks normal.

Another burn the usdpaa dtb file: fsl-ls1043a-rdb-usdpaa.dtb (from LSDK source) in emmc block, and fix the uboot mmcboot string. the kernel boot logs and the rootfs ifconfig result are in this file: ls1043_vnp_usdpaa_001.txt. And the ifconfig result looks abnormal: a lot of net devices like eth0 ... are lost.

[yipingwang]

When you use USDPAA dts file  fsl-ls1043a-rdb-usdpaa.dtb, all Ethernet ports have been assigned to USDPAA, so you cannot see any Ethernet port in Linux.

In fsl,dpaa device node definition in arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb-usdpaa.dts, if you delete  ethernet@0 definition, you will find eth0 is assigned to Linux, 

Thanks,

Yiping

[d-z-c]

Hi, YiPing

 Thank for you answer

 I could understand why there are no any ethernet port on Linux.

And do you have any idea to build a simple demo about the DPAA function(uboot,kernel configure,Linux rootfs references, and so on)，I just want to know how to use it and How does it work.

Thanks

TIC.

[yipingwang]

DPAA driver is enabled in Linux Kernel by default. You could run any networking related application(eg. ping, iperf).

You could refer to section "8.2 DPAA1-specific Software" in LSDK 20.04 user manual for how DPAA1 works.

[d-z-c]

Hi YiPing:
Do you mean both the two dtbs:fsl-ls1043a-rdb-sdk.dtb and fsl-ls1043a-rdb-usdpaa.dts
are DPAA driver enabled in Linux Kernel by default?

And How to enable / disable the DPAA function? then we could Compare their effects.

Thanks,

TIC

[yipingwang · Accepted solution]

The dts fsl-ls1043a-rdb-usdpaa.dts is used for DPDK, all Ethernet ports are assigned to the user space. DPDK is an user space packet processing framework.

File fsl-ls1043a-rdb-sdk.dtb is the normal dts file for Linux Kernel.

DPAA is the hardware mechanism to provide hardware acceleration of packet queues. DPAA module cannot be disabled in networking packets processing.