The various configuration scenarios listed in this section include a diagram and instructions on how
to bifurcate the PCIe interface using the mlxconfig tool. For more information on the mlxconfig
tool, please refer to mlxconfig – Changing Device Configuration Tool.
The following table summarizes the available configuration scenarios.
Configuration Root Port for Down
Stream Port (DSP)
devices:
DPU ARM / Host
DPU PCIe Goldfingers
Bifurcation
DPU PCIe Auxiliary
Connection Bifurcation
Default N/A 1 x Gen 5.0/4.0 x16 PCIe
lanes as upstream port
1 x Gen 5.0/4.0 x16 PCIe
lanes as upstream ports
Host as Root Port on
Peripherals
Host 1 x Gen 5.0/4.0 x16 PCIe
lanes as upstream port
4 x Gen 5.0/4.0 x4 PCIe
lanes as downstream ports
DPU Arms as Root Port
on Peripherals
DPU ARMs 1 x Gen 5.0/4.0 x16 PCIe
lanes as upstream port
4 x Gen 5.0/4.0 x4 PCIe
lanes as downstream ports
•
•
•
Before setting the desired configuration, take note of the following warnings:
Any customer-set configuration overrides the previous configuration values.
Misconfiguration may harm the system.
It is recommended to establish out-of-band connectivity to the BlueField DPU Arm OS
before setting any of these configurations for the first time. This enables you to reset
the NVConfig parameters to their default values in case of misconfiguration.
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