Dell has observed the issue on below Broadcom cards:
BCM57414 NetXtreme-E 10Gb/25Gb
BCM57608 10Gb/25Gb/50Gb/100Gb/200Gb/400Gb Ethernet

We have seen same error even after performing below steps
1. Upstream kernel
2. apply Netplan
3. passed intel_iommu=on,sm_on in grub (able to create virtual functions in 
lspci but not reflecting in /sys/class/net)

End Result:
echo 4 > /sys/class/net/<sriov vf interface>/device/sriov_numvfs command is 
getting executed, but
cat /sys/class/net shows no virtual interface created.
In dmesg logs it shows same error for all scenarios as below:
[45183.714317] bnxt_en 0000:46:00.1 eno17305np1: Reject SRIOV config request 
since if is down!
[45183.714332] bnxt_en 0000:46:00.1: 4 VFs requested; only 0 enabled

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https://bugs.launchpad.net/bugs/2098822

Title:
  [Ubuntu 24.04.01]SR-IOV virtual function interface are not registering
  after enabling SR-IOV on Broadcom Network Cards

Status in linux package in Ubuntu:
  New
Status in linux source package in Noble:
  New

Bug description:
  On Dell PowerEdge system SR-IOV virtual function interface are not
  registering after enabling SR-IOV on Broadcom Network Cards.

  Steps to Reproduce: -

  1. Navigate to the "Device Settings" section related to the installed NIC, 
Select "Virtualization Mode" and
     enable "SR-IOV" mode.
  2. Navigate to the System BIOS -> Integrated Device and select "SR-IOV Global 
Enable" to enable.
  3. After Booting the OS and command to enable SRIOV VFs -
     echo 4 > /sys/class/net/<sriov vf interface>/device/sriov_numvfs

  Expected Results: - cat /sys/class/net/<sriov vf 
interface>/device/sriov_numvfs should display 4 and
                      ls /sys/class/net/ should display virtual Interfaces 
created

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