[v2] doc: fix some statements for ice vector PMD

  1. Add descriptions for how to select avx512 datapath.
2. Add explanation for "P" in ice.ini.

Fixes: 7f85d5ebcfe1 ("net/ice: add AVX512 vector path")
Fixes: 271cc8c5028a ("doc: update ice features list")
Cc: stable@dpdk.org

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
---

v2:
fix statement for force-max-simd-bitwidth which is an EAL argument but
not devarg.

 doc/guides/nics/ice.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
  

> -----Original Message-----
> From: Zhang, Qi Z <qi.z.zhang@intel.com>
> Sent: Wednesday, December 16, 2020 8:22 AM
> To: Rong, Leyi <leyi.rong@intel.com>
> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; dev@dpdk.org; Zhang, Qi Z
> <qi.z.zhang@intel.com>; stable@dpdk.org
> Subject: [PATCH v2] doc: fix some statements for ice vector PMD
> 
> 1. Add descriptions for how to select avx512 datapath.
> 2. Add explanation for "P" in ice.ini.
> 
> Fixes: 7f85d5ebcfe1 ("net/ice: add AVX512 vector path")
> Fixes: 271cc8c5028a ("doc: update ice features list")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> ---
> 
> v2:
> fix statement for force-max-simd-bitwidth which is an EAL argument but not
> devarg.
> 
>  doc/guides/nics/ice.rst | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/doc/guides/nics/ice.rst b/doc/guides/nics/ice.rst index
> a0887f129f..2a4439a63a 100644
> --- a/doc/guides/nics/ice.rst
> +++ b/doc/guides/nics/ice.rst
> @@ -211,9 +211,12 @@ are chosen based on 2 conditions.
>  - ``CPU``
>    On the X86 platform, the driver checks if the CPU supports AVX2.
>    If it's supported, AVX2 paths will be chosen. If not, SSE is chosen.
> +  If the CPU supports AVX512 and EAL argument
> + ``force-max-simd-bitwidth``  is set to 512, AVX512 paths will be chosen.
> 
>  - ``Offload features``
> -  The supported HW offload features are described in the document ice_vec.ini.
> +  The supported HW offload features are described in the document
> + ice.ini,  A value "P" means the offload feature is not supported by vector path.
>    If any not supported features are used, ICE vector PMD is disabled and the
>    normal paths are chosen.
> 
> --
> 2.26.2

Acked-by: Leyi Rong <leyi.rong@intel.com>

Best Regards,
Leyi Rong
  

> -----Original Message-----
> From: Rong, Leyi <leyi.rong@intel.com>
> Sent: Thursday, December 17, 2020 10:13 AM
> To: Zhang, Qi Z <qi.z.zhang@intel.com>
> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; dev@dpdk.org; stable@dpdk.org
> Subject: RE: [PATCH v2] doc: fix some statements for ice vector PMD
> 
> 
> > -----Original Message-----
> > From: Zhang, Qi Z <qi.z.zhang@intel.com>
> > Sent: Wednesday, December 16, 2020 8:22 AM
> > To: Rong, Leyi <leyi.rong@intel.com>
> > Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; dev@dpdk.org; Zhang, Qi Z
> > <qi.z.zhang@intel.com>; stable@dpdk.org
> > Subject: [PATCH v2] doc: fix some statements for ice vector PMD
> >
> > 1. Add descriptions for how to select avx512 datapath.
> > 2. Add explanation for "P" in ice.ini.
> >
> > Fixes: 7f85d5ebcfe1 ("net/ice: add AVX512 vector path")
> > Fixes: 271cc8c5028a ("doc: update ice features list")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> > ---
> >
> > v2:
> > fix statement for force-max-simd-bitwidth which is an EAL argument but
> > not devarg.
> >
> >  doc/guides/nics/ice.rst | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/doc/guides/nics/ice.rst b/doc/guides/nics/ice.rst index
> > a0887f129f..2a4439a63a 100644
> > --- a/doc/guides/nics/ice.rst
> > +++ b/doc/guides/nics/ice.rst
> > @@ -211,9 +211,12 @@ are chosen based on 2 conditions.
> >  - ``CPU``
> >    On the X86 platform, the driver checks if the CPU supports AVX2.
> >    If it's supported, AVX2 paths will be chosen. If not, SSE is chosen.
> > +  If the CPU supports AVX512 and EAL argument
> > + ``force-max-simd-bitwidth``  is set to 512, AVX512 paths will be chosen.
> >
> >  - ``Offload features``
> > -  The supported HW offload features are described in the document
> ice_vec.ini.
> > +  The supported HW offload features are described in the document
> > + ice.ini,  A value "P" means the offload feature is not supported by vector
> path.
> >    If any not supported features are used, ICE vector PMD is disabled and
> the
> >    normal paths are chosen.
> >
> > --
> > 2.26.2
> 
> Acked-by: Leyi Rong <leyi.rong@intel.com>

Applied to dpdk-next-net-intel.

Thanks
Qi
> 
> Best Regards,
> Leyi Rong