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Important Notes

SR-IOV - Virtual Functions (VF) per Port - The maximum Virtual Functions (VF) per port is 127. For further information, see Known Issues.


It is recommended to enable the “above 4G decoding” BIOS setting for features that require large amount of PCIe resources.

Such features are: SR-IOV with numerous VFs, PCIe Emulated Switch, and Large BAR Requests.


Security Hardening Enhancements: This release contains important reliability improvements and security hardening enhancements. NVIDIA recommends upgrading your devices' firmware to this release to improve the devices’ firmware security and reliability.

Changes and New Feature in this Firmware Version 

Feature/ChangeDescription

26.38.1900

QKEY Mitigation in the Kernel

QKEY creation with the MSB set is available now for non-privileged users as well.

To allow non-privileged users to create QKEY with MSB set, the below new module parameter was added to ib_uverbs module:

  • Module Parameter: enforce_qkey_check
  • Description: Force QKEY MSB check for non-privileged user on UD QP creation
  • Default: 0 (disabled)

Note: In this release, this module parameter is disabled by default to ensure backward compatibility and give customers the opportunity to update their applications accordingly. In the upcoming release, it will be enabled by default, and later on deprecated. 

Unsupported Features and Commands

Unsupported Features

The following advanced feature are unsupported in the current firmware version:

  • The following service types:
    • SyncUMR
    • Mellanox transport
    • RAW IPv6
  • INT-A not supported for EQs only MSI-X
  • PCI VPD write flow (RO flow supported)
  • Streaming Receive Queue (STRQ) and collapsed CQ
  • Subnet Manager (SM) on VFs
  • RoCE LAG in Multi-Host/Socket-Direct

Unsupported Commands

  • QUERY_MAD_DEMUX
  • SET_MAD_DEMUX
  • CREATE_RQ - MEMORY_RQ_RMP
  • MODIFY_LAG_ASYNC_EVENT