[DPDK/ethdev Bug 1845] DPDK 20 guest with X710 SR-IOV: VF MAC changes randomly on reboot (host i40e 2.22.18)

[DPDK/ethdev Bug 1845] DPDK 20 guest with X710 SR-IOV: VF MAC changes randomly on reboot (host i40e 2.22.18)

[bugzilla]

http://bugs.dpdk.org/show_bug.cgi?id=1845

            Bug ID: 1845
           Summary: DPDK 20 guest with X710 SR-IOV: VF MAC changes
                    randomly on reboot (host i40e 2.22.18)
           Product: DPDK
           Version: 20.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: gownivalla.susmitha@wipro.com
  Target Milestone: ---

Hello DPDK Community,

We are seeing an intermittent issue where the VF MAC address on the host (PF
side) changes unexpectedly after VM reboot when using Intel X710 NICs.

Environment
NIC: Intel X710 (SR-IOV)
Host driver (problematic): i40e 2.22.18
Host firmware/NVM tested: 6.00 and 9.10

Host driver (working): i40e 2.14.x
Working firmware/NVM: 7.10

Hypervisor: OpenStack (Neutron sets MAC during orchestration)
MAC is explicitly assigned in orchestration YAML

Issue
The assigned VF MAC is correctly programmed at initial VM creation.
However, on some VM reboots (not every time), the MAC on the host VF changes to
a random, different MAC.

Expected
VF MAC programmed by orchestration should remain persistent across reboots.

Observed Only With
i40e 2.22.18
Firmware 6.00 and 9.10

Not Observed With
i40e 2.14.13
Firmware 7.10

Request/Clarification required:
Is this a known issue in i40e 2.22.18 or DPDK 20.11?
Any recommended fix, patch, or firmware/driver combination?
Any debug flags or traces we can enable to capture VF MAC programming failures?

Please let me know if additional logs are needed.

Thanks,
Susmitha

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