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Date: Thu, 17 Sep 2020 10:17:23 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: Sarosh Arif <sarosh.arif@emumba.com>
Cc: dev@dpdk.org
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Subject: Re: [dpdk-dev] unable to bind to vfio-pci
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On Thu, Sep 17, 2020 at 11:52:58AM +0500, Sarosh Arif wrote:
> I have been trying to bind to vfio-pci using usertools/dpdk-devbind.py
> but am unable to do so. The reason behind this is that I am unable to
> write in /sys/bus/pci/drivers/vfio-pci/bind. Upon searching solutions
> I tried a couple of things such as setting iommu=pt and intel_iommu=on
> and ensured vt-d is enabled.
> Along with this I have made sure that the vfio-pci module is correctly
> loaded. I have also tried
> 
> chmod 666 /sys/bus/pci/drivers/vfio-pci/bind
> 
> So that I have permissions to write in this file.
> 
> The error I get when I use usertools/dpdk-devbind.py to bind is this:
> Error: bind failed for 0000:b7:00.1 - Cannot bind to driver vfio-pci
> 
> The details of 0000:b7:00.1 are as follows:
> Ethernet Connection X722 for 10GBASE-T 37d2' if=eno6 drv=i40e
> 
> I have also unbinded The pci bridge to which 0000:b7:00.1 was connected.
> 
> What more can be done to resolve this?
>
Since you describe changing permissions on the "bind" file, are you trying
to run dpdk-devbind.py as a non-root user? Does it work as root?