[dpdk-dev] [PATCH] doc: update for ENA supported drivers

[Ferruh Yigit]

On 10/5/2018 10:02 AM, Rafal Kozik wrote:
> Add instruction how to bind ENA to VFIO-PCI driver.
> 
> Fixes: cf8a122c296a ("ena: introduce documentation")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Zorik Machulsky <zorik at amazon.com>
> Signed-off-by: Rafal Kozik <rk at semihalf.com>
> Acked-by: Michal Krawczyk <mk at semihalf.com>
> ---
>  doc/guides/nics/ena.rst          | 12 +++++++++---
>  doc/guides/nics/features/ena.ini |  1 +
>  2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/doc/guides/nics/ena.rst b/doc/guides/nics/ena.rst
> index d19912e..0dfefc6 100644
> --- a/doc/guides/nics/ena.rst
> +++ b/doc/guides/nics/ena.rst
> @@ -187,11 +187,17 @@ Prerequisites
>  -------------
>  
>  #. Prepare the system as recommended by DPDK suite.  This includes environment
> -   variables, hugepages configuration, tool-chains and configuration
> +   variables, hugepages configuration, tool-chains and configuration.
>  
> -#. Insert igb_uio kernel module using the command 'modprobe igb_uio'
> +#. ENA PMD can operate with vfio-pci or igb_uio driver.
>  
> -#. Bind the intended ENA device to igb_uio module
> +#. Insert vfio-pci or igb_uio kernel module using the command
> +   'modprobe vfio-pci' or 'modprobe igb_uio' respectively.

Unless installed "igb_uio" won't be available to use with "modprobe", not sure
about adding that detail, what do you think?

> +
> +#. If vfio-pci driver is used please make sure noiommu mode is enabled:
> +   echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode

This is only required if there is no iommu on the system, right? Won't ena will
work without this parameter on the system that has iommu?

> +
> +#. Bind the intended ENA device to vfio-pci or igb_uio module.
>  
>  
>  At this point the system should be ready to run DPDK applications. Once the
> diff --git a/doc/guides/nics/features/ena.ini b/doc/guides/nics/features/ena.ini
> index 691c1e3..aa6f05a 100644
> --- a/doc/guides/nics/features/ena.ini
> +++ b/doc/guides/nics/features/ena.ini
> @@ -23,5 +23,6 @@ Inner L4 checksum    = Y
>  Basic stats          = Y
>  Extended stats       = Y
>  Linux UIO            = Y
> +Linux VFIO           = Y
>  x86-32               = Y
>  x86-64               = Y
>