QDMA Features

QDMA DPDK Driver supports the following list of features

Hardware Features

  • SRIOV with 4 Physical Functions and 252 Virtual Functions

  • Memory Mapped (MM) and Stream (ST) interfaces per queue

  • 2048 queues sets

    • 2048 H2C (host-to-card) Descriptor rings
    • 2048 C2H (card-to-host) Descriptor rings
    • 2048 Completion rings

  • Mailbox communication between PF and VF driver

  • Interrupt support for Mailbox events

  • HW Error reporting

  • Zero byte transfers

  • Immediate data transfers

  • Descriptor bypass (8, 16, 32, 64 descriptor sizes) support

  • Descriptor Prefetching

  • Streaming C2H completion entry coalescing

  • Disabling overflow check in completion ring

  • Streaming H2C to C2H and C2H to H2C loopback support

  • Dynamic queue configuration

  • Completion ring descriptors of 8, 16, 32, 64 bytes sizes

  • ECC support

Features Supported for QDMA3.1

  • Flexible BAR mapping for QDMA configuration register space
  • MM completions

Features Supported for QDMA4.0

  • Support for more than 256 functions
  • Support multiple bus number on single card

Features Supported only in Versal CPM4 Design

  • SRIOV with 4 Physical Functions (PF) and 252 Virtual Functions (VF)

  • Descriptor Engine can be configured in Internal Mode only

  • Supports 2048 queue sets for Physical Functions

    • 2048 H2C (Host-to-Card) descriptor rings
    • 2048 C2H (Card-to-Host) descriptor rings
    • 2048 completion rings

  • Supports 256 queue sets for Virtual Functions

    • 256 H2C (Host-to-Card) descriptor rings
    • 256 C2H (Card-to-Host) descriptor rings
    • 256 Completion Rings

  • Tandem boot support

Features Supported only in Versal CPM5 Design

  • SRIOV with 4 Physical Functions (PF) and 240 Virtual Functions (VF)

  • Debug mode, with extra registers for debug purposes

  • Descriptor Engine can be configured in Internal Mode only

  • Supports 4096 queue sets for Physical Functions

    • 4096 H2C (Host-to-Card) descriptor rings
    • 4096 C2H (Card-to-Host) descriptor rings
    • 4096 completion rings

  • Supports 256 queue sets for Virtual Functions

    • 256 H2C (Host-to-Card) descriptor rings
    • 256 C2H (Card-to-Host) descriptor rings
    • 256 Completion Rings

  • Tandem boot support

For details on QDMA Hardware Features refer to QDMA_Soft_Product_Guide.

For details on CPM4 and CPM5 Hardware Features refer to QDMA_Hard_Product_Guide.

Software Features

  • Support DPDK v22.11 LTS
  • Support DPDK v21.11 LTS
  • Support DPDK v20.11 LTS
  • Support driver binding to igb_uio and vfio-pci
  • Support device arguments (module parameters) for device level configuration
  • Allows only Privileged Physical Functions to program the contexts and configuration registers
  • Device and queue configuration through additional driver APIs
  • Interoperability between Linux driver (as PF/VF) and DPDK driver (as PF/VF)
  • SW versioning
  • Added support for detailed register dump
  • Added support for post processing HW error messages
  • Added support for Debug mode and Internal only mode