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From: Sarosh Arif <sarosh.arif@emumba.com>
Date: Thu, 17 Sep 2020 11:52:58 +0500
Message-ID: <CABoZmYMNfNAEQ_=-9JWZKPazx+RkeTgs0A_F=cz7OYKd8XQNsA@mail.gmail.com>
To: dev@dpdk.org
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Subject: [dpdk-dev]  unable to bind to vfio-pci
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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?

Regards,
Sarosh Arif