Re: [dpdk-dev] Error running dpdk app: cannot open /dev/uio

["Qiu, Michael" <michael.qiu@intel.com>]

On 12/3/2014 9:25 AM, Malveeka Tewari wrote:
> I do have the uio and igb_uio modules loaded.
> For my issue, I found a workaround by manually creating /dev/uio0
> using mknod.
> But I still get the vfio error.
>
> If I try "sudo modprobe vfio" but that gives an error that Module vfio
> not found.
> I tried looking for vfio.ko in the dpdk source tree as well but could
> not find that module.
> How can I install the vfio module?

VFIO is supplied by kernel :)
if you use uio then vfio can be ignored. It is just another way of
things in new kernel(version > 3.6).

Thanks,
Michael

>
> Thanks!
> Malveeka
>
>
>
> On Tue, Dec 2, 2014 at 5:12 PM, Qiu, Michael <michael.qiu@intel.com
> <mailto:michael.qiu@intel.com>> wrote:
>
>     Hi Malveeka,
>
>     To be sure that you should have [uio, igb_uio] or [uio,
>     uio_pci_generic]
>     or [vfio] module loaded.
>
>     Thanks,
>     Michael
>     On 12/3/2014 5:44 AM, Malveeka Tewari wrote:
>     > Hi
>     >
>     > I am trying to run the testpmd app as but I get the following
>     errors:
>     > EAL: VFIO could not be initialized
>     > EAL: Cannot open /dev/uio0: No such file or directory
>     > EAL: Error - exiting with code: 1
>     >   Cause: Requested device 0000:07:00.0 cannot be used
>     >
>     > lsmod shows that the uio module is installed.
>     > Is there anything that's missing?
>     >
>     > Thanks!
>     > Malveeka
>     >
>     >
>     >
>     > Output on trying to run testpmd
>     >
>     > EAL: Detected 16 lcore(s)
>     > *EAL:   cannot open VFIO container, error 2 (No such file or
>     directory)*
>     > *EAL: VFIO support could not be initialized*
>     > EAL: Setting up memory...
>     > EAL: Ask a virtual area of 0x200000 bytes
>     > EAL: Virtual area found at 0x7fe66ac00000 (size = 0x200000)
>     > EAL: Ask a virtual area of 0xffc00000 bytes
>     > EAL: Virtual area found at 0x7fe56ae00000 (size = 0xffc00000)
>     > EAL: Ask a virtual area of 0x200000 bytes
>     > EAL: Virtual area found at 0x7fe56aa00000 (size = 0x200000)
>     > EAL: Ask a virtual area of 0xfec00000 bytes
>     > EAL: Virtual area found at 0x7fe46bc00000 (size = 0xfec00000)
>     > EAL: Ask a virtual area of 0x400000 bytes
>     > EAL: Virtual area found at 0x7fe46b600000 (size = 0x400000)
>     > EAL: Ask a virtual area of 0x400000 bytes
>     > EAL: Virtual area found at 0x7fe46b000000 (size = 0x400000)
>     > EAL: Ask a virtual area of 0x400000 bytes
>     > EAL: Virtual area found at 0x7fe46aa00000 (size = 0x400000)
>     > EAL: Ask a virtual area of 0x400000 bytes
>     > EAL: Virtual area found at 0x7fe46a400000 (size = 0x400000)
>     > EAL: Ask a virtual area of 0x400000 bytes
>     > EAL: Virtual area found at 0x7fe469e00000 (size = 0x400000)
>     > EAL: Requesting 2048 pages of size 2MB from socket 0
>     > EAL: Requesting 2048 pages of size 2MB from socket 1
>     > EAL: TSC frequency is ~2266745 KHz
>     > EAL: Master core 3 is ready (tid=6cedb800)
>     > EAL: PCI device 0000:07:00.0 on NUMA socket -1
>     > EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
>     >
>     >
>     > *EAL: Cannot open /dev/uio0: No such file or directoryEAL: Error
>     - exiting
>     > with code: 1  Cause: Requested device 0000:07:00.0 cannot be used*
>     >
>
>