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I'm having issues on creating VF with ubuntu 18.04. SR-IOV is enabled from BIOS, the NIC are Intel X550, I added intel_iommu=on to /etc/default/grub and also tried using modprobe.d
by adding options ixgbe max_vfs=8 on /etc/modprobe.d/ixgbe.conf

But if I check using lspci | grep -i ethernet I only get the physical cards. I have also tried:

# echo '7' > /sys/class/net/eno1/device/sriov_numvfs
bash: /sys/class/net/eno1/device/sriov_numvfs: Permission denied

Is the configuration correct?

Update:

After updating the ixgbe driver to the last one I get:

$ dmesg | grep iov
[    3.834884] ixgbe 0000:19:00.0: echo '32' > /sys/bus/pci/devices/0000:19:00.0/sriov_numvfs
[    3.834894] ixgbe 0000:19:00.0 0000:19:00.0 (uninitialized): Failed to enable PCI sriov: -38

Many thanks. Gabriele

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  • Are the usual IOMMU/DMAR messages showing up - compare your system after boot to [this Questions output]( stackoverflow.com/questions/44286683/…). In general posting (as pastebin or such) a full dmesg is often useful for IOMMU setup related questions.
    – Christian Ehrhardt
    Sep 14, 2018 at 5:01
  • Thank @ChristianEhrhardt here the [output of dmesg | grep iommu ](pastebin.com/byLHq77w) to me seems that IOMMU is enabled and I can also see the PCI address of the network cards ( 0000:19:00.0 to 0000:1a:00.1) I also posy the full dmesg if you think that could help. Also I need to configure it using sysfs instead of the parameter to the module? [ 378.661692] ixgbe 0000:19:00.1: Enabling SR-IOV VFs using the max_vfs module parameter is deprecated - please use the pci sysfs interface instead.
    – Gabriele
    Sep 14, 2018 at 7:11

1 Answer 1

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I solved this, was a lack of documentation from Dell side. I had to enable also SR-IOV for each NIC, in the Device Settigs from the System Configuration, the global enabler is not enough.

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