unable to bind to vfio-pci

[Nagendra Prabhu A T]

These are the messages i am seeing dmesg

[16588.298660] vfio-pci: probe of 0000:8a:00.2 failed with error -22
[16591.574630] i40e 0000:8a:00.3: i40e_ptp_stop: removed PHC on enp138s0f3
[16593.138613] vfio-pci: probe of 0000:8a:00.3 failed with error -22
[16593.138674] vfio-pci: probe of 0000:8a:00.3 failed with error -22
[16627.551866] vfio-pci: probe of 0000:51:00.0 failed with error -22
[16627.551922] vfio-pci: probe of 0000:51:00.0 failed with error -22
[16716.344530] vfio-pci: probe of 0000:51:00.0 failed with error -22
[16716.344585] vfio-pci: probe of 0000:51:00.0 failed with error -22
[17859.876566] vfio-pci: probe of 0000:51:00.0 failed with error -22
[17859.876622] vfio-pci: probe of 0000:51:00.0 failed with error -22
root at nat-kvm:/home/nat# cat /boot/config-$(uname -r) | grep NOIOMMU
CONFIG_VFIO_NOIOMMU=y
root at nat-kvm:/home/nat#



Interface type :

Other Network devices
=====================
0000:51:00.0 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci
0000:51:00.1 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci
0000:51:00.2 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci
0000:51:00.3 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci
0000:8a:00.0 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci
0000:8a:00.1 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci
0000:8a:00.2 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci
0000:8a:00.3 'Ethernet Controller X710 for 10GbE SFP+ 1572'
unused=i40e,vfio-pci


On Tue, Feb 21, 2023 at 9:37 PM Bruce Richardson <bruce.richardson at intel.com>
wrote:

> On Tue, Feb 21, 2023 at 09:30:15PM +0530, Nagendra Prabhu A T wrote:
> >    HI Bruce,
> >    Thanks for your reply.
> >    I have removed the binding of all other ports. So , i can confirm that
> >    #2 is taken care of.
> >    I tried using a different driver "uio_pci_generic". I still see the
> >    same issue for that driver as well.
> >    The problem seems to be because the write operation is not happening
> in
> >    "bind" file.
> >    Infact tried doing the following step manually. That also failed
> >    echo sh -c 0000:51:00.0 > /sys/bus/pci/drivers/uio_pci_generic/bind
> >    bash: echo: write error: No such device
>
> The "sh -c" doesn't look right in that command. It should just echo the
> device id to the bind file. However, it's generally recommended just to use
> the devbind script, as more writes to sysfs may be necessary first, e.g. to
> register the device ids first.
>
> >    I have required permission for the file.
> >    I tried doing with "sudo"
> >    I dont have selinux running
> >    So not sure whats blocking me. Infact , even
> >    "cat /sys/bus/pci/drivers/uio_pci_generic/bind" is failing
> >    Can you please help.
>
> To track down issues other than the obvious, I think we need more
> information. For example, what NIC card is this? Are there any useful error
> messages in dmesg?
>
> /Bruce
>
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