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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
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.
The following table summarizes the available configuration scenarios.
Configuration
Default
Host as Root Port on
Peripherals
DPU Arms as Root Port
on Peripherals
Root Port for Down
Stream Port (DSP)
devices:
DPU ARM / Host
N/A
Host
DPU ARMs
Tool.
DPU PCIe Goldfingers
Bifurcation
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 port
1 x Gen 5.0/4.0 x16 PCIe
lanes as upstream port
DPU PCIe Auxiliary
Connection Bifurcation
1 x Gen 5.0/4.0 x16 PCIe
lanes as upstream ports
4 x Gen 5.0/4.0 x4 PCIe
lanes as downstream ports
4 x Gen 5.0/4.0 x4 PCIe
lanes as downstream ports
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