Re: [dpdk-dev] [PATCH] doc/guides/rel_notes: Add known issue for IOMMU attributes read

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 14-May-18 11:44 AM, Rosen Xu wrote:
> Read IOMMU attributes from linux kernle 4.10.0 error.

s/kernle/kernel :)

> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Rosen Xu <rosen.xu@intel.com>
> ---
>   doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
> 
> diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
> index afcc2c4..74876ff 100644
> --- a/doc/guides/rel_notes/known_issues.rst
> +++ b/doc/guides/rel_notes/known_issues.rst
> @@ -714,3 +714,24 @@ igb_uio can not be used when running l3fwd-power
>   
>   **Driver/Module**:
>      ``igb_uio`` module.
> +
> +
> +linux kernel iommu attribute read error

Should this be capitalized?

> +---------------------------------------
> +
> +**Description**:
> +   Read immu attributes from /sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap in linux kernel
> +   4.10.0 error. That because the link between the iommu sysfs-device and the struct intel_iommu
> +   is no longer stored as driver-data.

s/immu/IOMMU/, and i think this needs to be rewritten to something like 
as follows:

Reading IOMMU attributes from 
/sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap in Linux kernel 
4.10.0 results in an error. This is because the link between the IOMMU 
sysfs-device and struct intel_iommu is no longer stored as driver-data.

(i have no idea what that last sentence means, maybe someone could help 
provide a better explanation?)

> +
> +**Implication**:
> +   When insmod ``vfio-pci`` and running testpmd APP, it doesn't initiate properly.

Should probably be reworded as follows:

When binding devices to VFIO and attempting to run testpmd application, 
testpmd (and other DPDK applications) will not initialize.

> +
> +**Resolution/Workaround**:
> +   Use other linux kernel version. It only happens in linux kernel 4.10.0.
> +
> +**Affected Environment/Platform**:
> +   ALL OS of linux kernel 4.10.0.
> +
> +**Driver/Module**:
> +   ``vfio-pci`` module.
> 


-- 
Thanks,
Anatoly