BF3: PCIe P2P DMA from GPU VRAM to DPU DDR – supported?

Infrastructure & Networking BlueField
1

Hi,
We’re evaluating whether BlueField-3 can perform PCIe P2P DMA from GPU VRAM directly to DPU DDR (ARM-initiated, host CPU bypassed).
From our testing, DOCA DMA requires a DMA‑able PCIe/IOMMU mapping of GPU memory on the DPU side. Without that, the DPU DMA engine can’t use GPU VA or dmabuf fd alone.

Our questions:
Is this officially supported on BF3? If yes, which API / sample should we look at?
Can doca_devemu, VFIO, or IOMMU help map GPU BAR/dmabuf as DPU-accessible IOVA? If not supported, our fallback is GPUDirect RDMA / GPUNetIO – is that the recommended path?
We’ve already reviewed DOCA DMA and GPUNetIO docs, but found no clear example for this specific P2P case.

Any clarification would be greatly appreciated.
Thanks!

2

Hi,

Thanks for your question.

In order to handle your request, a new support case will be required, and it will be handled according to the entitlement.

To Create a New Enterprise Support Case Please Use One of the Following Methods

  1. Log in and Create a Case in the Enterprise Support Portal
    AppHub UI
    This is recommended and will provide the fastest response

  2. Call your Regional Enterprise Support Number
    Find your regional phone numbers:
    NVIDIA Enterprise Customer Support

  3. Create a Case Without a Login
    EnterpriseSupport
    Can be used to check warranty status
    Recommended to reset login passwords
    Requires validation and may increase time to respond

Best Regards,

Anatoly