Re: mellanox mlx4_core and SR-IOV

Yinghai Lu
2012-08-01T18:29:07Z

On Wed, Aug 1, 2012 at 10:37 AM, Roland Dreier <roland@kernel.org> wrote:
> On Wed, Aug 1, 2012 at 6:38 AM, Lukas Hejtmanek <xhejtman@ics.muni.cz> wrote:
>> [ 3.558296] mlx4_core 0000:02:00.0: not enough MMIO resources for SR-IOV (nres: 0, iov->nres: 1)
>
> This comes from the core sriov_enable() function, not anything in mlx4.
> (although my kernel doesn't have the print of nres in that message)
>
> Not sure what it means.

On Wed, Aug 1, 2012 at 10:37 AM, Roland Dreier <roland@kernel.org> wrote:
> On Wed, Aug 1, 2012 at 6:38 AM, Lukas Hejtmanek <xhejtman@ics.muni.cz> wrote:
>> [ 3.558296] mlx4_core 0000:02:00.0: not enough MMIO resources for SR-IOV (nres: 0, iov->nres: 1)
>
> This comes from the core sriov_enable() function, not anything in mlx4.
> (although my kernel doesn't have the print of nres in that message)
>
> Not sure what it means.

iov bar is not assigned by BIOS, and kernel can not find range for it too.

Lukas, can you post whole boot log with PCI_DEBUG enabled? That will
tell exact why kernel does not assign them.

Recent kernel from 3.4... should enable realloc when SRIOV bar is not assigned.

Thanks

Yinghai