Re: [dpdk-dev] [PATCH] doc: Clarify IOMMU usage with "uio-pci" kernel module

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 5 Sep 2018 00:20:29 +0000
"Tone Zhang (Arm Technology China)" <Tone.Zhang@arm.com> wrote:

> Hi Rami,
> 
> Yes, I mean “uio_pci_generic” kernel module.
> 
> I will update the change accordingly.
> 
> Thanks.
> 
> Br,
> Tone
> 
> From: Rami Rosen <roszenrami@gmail.com>
> Sent: Wednesday, September 5, 2018 3:55 AM
> To: Tone Zhang (Arm Technology China) <Tone.Zhang@arm.com>
> Cc: dev@dpdk.org; nd <nd@arm.com>
> Subject: Re: [dpdk-dev] [PATCH] doc: Clarify IOMMU usage with "uio-pci" kernel module
> 
> Hi Tone,
> >if the devices for used DPDK bound to the ``uio-pci`` kernel module, please make  
> 
> The three kernel modules which can be used for DPDK binding are vfio-pci, uio_pci_generic and igb_uio. Don't you mean here uio_pci_generic ?
> 
> Regards,
> Rami Rosen
> 
> 
> בתאריך יום ג׳, 4 בספט׳ 2018, 11:59, מאת tone.z
> When binding the devices used by DPDK to the "uio-pci" kernel module,
> the IOMMU should be disabled in order not to break the
> because of the virtual / physical address mapping.
> 
> The patch clarifies the IOMMU configuration on both x86_64 and arm64
> systems.
> 
> Signed-off-by: tone.zhang <tone.zhang@arm.com<mailto:tone.zhang@arm.com>>
> ---
>  doc/guides/linux_gsg/linux_drivers.rst | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/doc/guides/linux_gsg/linux_drivers.rst b/doc/guides/linux_gsg/linux_drivers.rst
> index 371a817..8f9ec8f 100644
> --- a/doc/guides/linux_gsg/linux_drivers.rst
> +++ b/doc/guides/linux_gsg/linux_drivers.rst
> @@ -48,6 +48,13 @@ be loaded as shown below:
>     ``vfio-pci``
> 2.7.4

Also, it would be good if documentation was clear in recommending using VFIO
instead if IOMMU is present.