Re: [dpdk-dev] [PATCH v3 0/5] lpm lookup with sve support

[Ruifeng Wang <Ruifeng.Wang@arm.com>]

> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Thursday, January 14, 2021 11:40 PM
> To: Ruifeng Wang <Ruifeng.Wang@arm.com>; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>
> Cc: dev <dev@dpdk.org>; Vladimir Medvedkin
> <vladimir.medvedkin@intel.com>; Pavan Nikhilesh
> <pbhagavatula@marvell.com>; jerinj@marvell.com;
> hemant.agrawal@nxp.com; nd <nd@arm.com>
> Subject: Re: [dpdk-dev] [PATCH v3 0/5] lpm lookup with sve support
> 
> On Thu, Jan 14, 2021 at 4:18 PM David Marchand
> <david.marchand@redhat.com> wrote:
> >
> > Ruifeng, Honnappa,
> >
> > On Tue, Jan 12, 2021 at 3:57 AM Ruifeng Wang <ruifeng.wang@arm.com>
> wrote:
> > >
> > > Added lpm4 lookupx4 implementation by using Arm SVE extension.
> > > The SVE is Scalable Vector Extension which is exposed to the user
> > > with a vector length agnostic interface.
> > > Refer to [1] for more information about SVE.
> > >
> > > Configuration was added for Neoverse N2 CPU which has SVE support.
> > >
> > > Some bugs were fixed so compiling with sve enabled can pass.
> > >
> > > [1]
> > > https://developer.arm.com/tools-and-software/server-and-
> hpc/compile/
> > > arm-instruction-emulator/resources/tutorials/sve
> >
> > Can you point at a toolchain that supports SVE without having to
> > register to some commercial spamming system? :-) The only
> > aarch64-linux-gnu- toolchain I found on the ARM website is a 8.x gcc
> > that does not seem to support SVE.
> 
> I tested this using
> https://developer.arm.com/-/media/Files/downloads/gnu-a/10.2-
> 2020.11/binrel/gcc-arm-10.2-2020.11-x86_64-aarch64-none-linux-gnu.tar.xz

Yes, gcc-10 has SVE support. Arm cross compilers available at:
https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads

> But I had to modify the cross compile prefix in
> config/arm/arm64_n2_linux_gcc (adding a none_).
> I am still interested in a toolchain that works out of the box.

I think on Ubuntu, it will work out of the box after installing package gcc-10-aarch64-linux-gnu.

> 
> Series applied, thanks.

Thank you.

> 
> 
> --
> David Marchand