l2fwd: Requested device 0000:02:00.0 cannot be used (Ubuntu 22.04, DPDK 22.07, N5095, I225-V)

[Stephen Hemminger]

On Tue, 20 Sep 2022 19:04:57 +0800 (CST)
F32  <feng32 at 163.com> wrote:

> Hi Stephen,
> 
> 
> I have checked related iommu_groups:
> 
> 
> $ readlink 0000\:01\:00.0/iommu_group
> 
> ../../../../kernel/iommu_groups/16
> 
> $ readlink 0000\:02\:00.0/iommu_group
> 
> ../../../../kernel/iommu_groups/17
> 
> $ readlink 0000\:03\:00.0/iommu_group
> 
> ../../../../kernel/iommu_groups/18
> 
> $ readlink 0000\:04\:00.0/iommu_group
> 
> ../../../../kernel/iommu_groups/19
> 
> $ readlink 0000\:05\:00.0/iommu_group
> 
> ../../../../kernel/iommu_groups/20
> 
> 
> 
> It seems that the adapters belongs to different iommu_groups.

The way I would fix it is add instrumentation (ie printf) in EAL
code where the can not be used message is and work backwards from there.