[dpdk-users] Not able to access /dev/uioX from inside LXC

[dpdk-users] Not able to access /dev/uioX from inside LXC

[Nagaprabhanjan Bellaru]

Hi,

The instructions mentioned by Krishnamurthy here:
http://dpdk.org/ml/archives/dev/2014-October/006373.html

greatly helped to make progress on accessing PCI devices from with in the
container, however, DPDK is not able to open them because of privilege
issues. Has somebody been able to crack this issue? If so, can they please
show me the way to do it?

--
EAL: Detected 24 lcore(s)
EAL: No free hugepages reported in hugepages-1048576kB
EAL: Probing VFIO support...
[New Thread 0x7fff8ece0700 (LWP 22134)]
EAL: PCI device 0000:06:00.0 on NUMA socket -1
EAL:   probe driver: 8086:1583 rte_i40e_pmd
EAL: Cannot open /dev/uio0: Operation not permitted
EAL: Error - exiting with code: 1
  Cause: Requested device 0000:06:00.0 cannot be used
[Thread 0x7ffff7fe7700 (LWP 22130) exited]
[Inferior 1 (process 22130) exited with code 01]
--

Thanks,
-nagp

Re: [dpdk-users] Not able to access /dev/uioX from inside LXC

[Nagaprabhanjan Bellaru]

There were two issues w.r.t the above problem

* The uioX major number is not fixed across machine reboots - so I had to
keep two-three major numbers in devices.allow section to do this.
* The sysfs was mounted as read-only file system. When I remounted it as
read-write, all problems went away. I could access 40G ports from inside
LXC container.

Thanks,
-nagp

On Sat, Nov 12, 2016 at 8:02 PM, Nagaprabhanjan Bellaru <
nagp.lists@gmail.com> wrote:

> Hi,
>
> The instructions mentioned by Krishnamurthy here:
> http://dpdk.org/ml/archives/dev/2014-October/006373.html
>
> greatly helped to make progress on accessing PCI devices from with in the
> container, however, DPDK is not able to open them because of privilege
> issues. Has somebody been able to crack this issue? If so, can they please
> show me the way to do it?
>
> --
> EAL: Detected 24 lcore(s)
> EAL: No free hugepages reported in hugepages-1048576kB
> EAL: Probing VFIO support...
> [New Thread 0x7fff8ece0700 (LWP 22134)]
> EAL: PCI device 0000:06:00.0 on NUMA socket -1
> EAL:   probe driver: 8086:1583 rte_i40e_pmd
> EAL: Cannot open /dev/uio0: Operation not permitted
> EAL: Error - exiting with code: 1
>   Cause: Requested device 0000:06:00.0 cannot be used
> [Thread 0x7ffff7fe7700 (LWP 22130) exited]
> [Inferior 1 (process 22130) exited with code 01]
> --
>
> Thanks,
> -nagp
>