Re: [dpdk-dev] [PATCH v2 1/1] build: add Graviton2(arm64) meson configuration

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

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Vimal Chungath
> Sent: Wednesday, October 28, 2020 4:18 AM
> To: dev@dpdk.org
> Cc: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>; Dharmik
> Thakkar <Dharmik.Thakkar@arm.com>; alisaidi@amazon.com;
> bruce.richardson@intel.com; hemant.agrawal@nxp.com;
> jerinj@marvell.com; jerinjacobk@gmail.com; juraj.linkes@pantheon.tech;
> nd <nd@arm.com>; thomas@monjalon.net
> Subject: [dpdk-dev] [PATCH v2 1/1] build: add Graviton2(arm64) meson
> configuration
> 
> Add meson build configuration for Graviton2 platform with 64-bit Arm
> Neoverse N1 cores. This patch makes the following changes to generic
> Neoverse N1 config:
> 
> 1. increase lcore limit to 64
> 2. increase memory support to 1TB
> 3. remove +crc from -march as that is default when setting armv8.2
> 
> For more information about Graviton2 platform, refer to:
> https://aws.amazon.com/ec2/graviton/
> 
> Signed-off-by: Vimal Chungath <vcchunga@amazon.com>
> ---
>  config/arm/arm64_graviton2_linux_gcc | 17 +++++++++++++++++
>  config/arm/meson.build               | 12 +++++++++++-
>  2 files changed, 28 insertions(+), 1 deletion(-)  create mode 100644
> config/arm/arm64_graviton2_linux_gcc
> 
> diff --git a/config/arm/arm64_graviton2_linux_gcc
> b/config/arm/arm64_graviton2_linux_gcc
> new file mode 100644
> index 000000000..022e06303
> --- /dev/null
> +++ b/config/arm/arm64_graviton2_linux_gcc
> @@ -0,0 +1,17 @@
> +[binaries]
> +c = 'aarch64-linux-gnu-gcc'
> +cpp = 'aarch64-linux-gnu-cpp'
> +ar = 'aarch64-linux-gnu-gcc-ar'
> +strip = 'aarch64-linux-gnu-strip'
> +pkgconfig = 'aarch64-linux-gnu-pkg-config'
> +pcap-config = ''
> +
> +[host_machine]
> +system = 'linux'
> +cpu_family = 'aarch64'
> +cpu = 'armv8-a'
> +endian = 'little'
> +
> +[properties]
> +implementor_id = '0x41'
> +implementor_pn = '0xd0c'
> diff --git a/config/arm/meson.build b/config/arm/meson.build index
> b49203fa8..0e7124843 100644
> --- a/config/arm/meson.build
> +++ b/config/arm/meson.build
> @@ -86,6 +86,16 @@ flags_octeontx2_extra = [
>  	['RTE_ARM_FEATURE_ATOMICS', true],
>  	['RTE_EAL_IGB_UIO', false],
>  	['RTE_USE_C11_MEM_MODEL', true]]
> +flags_n1generic_extra = [
> +	['RTE_MACHINE', '"neoverse-n1"'],
> +	['RTE_MAX_LCORE', 64],
> +	['RTE_CACHE_LINE_SIZE', 64],
> +	['RTE_ARM_FEATURE_ATOMICS', true],
> +	['RTE_USE_C11_MEM_MODEL', true],
> +	['RTE_MAX_MEM_MB', 1048576],
> +	['RTE_MAX_NUMA_NODES', 1],
> +	['RTE_EAL_NUMA_AWARE_HUGEPAGES', false],
> +	['RTE_LIBRTE_VHOST_NUMA', false]]
> 
>  machine_args_generic = [
>  	['default', ['-march=armv8-a+crc', '-moutline-atomics']], @@ -97,7
> +107,7 @@ machine_args_generic = [
>  	['0xd09', ['-mcpu=cortex-a73']],
>  	['0xd0a', ['-mcpu=cortex-a75']],
>  	['0xd0b', ['-mcpu=cortex-a76']],
> -	['0xd0c', ['-march=armv8.2-a+crc+crypto', '-mcpu=neoverse-n1'],
> flags_n1sdp_extra]]
> +	['0xd0c', ['-march=armv8.2-a+crypto', '-mcpu=neoverse-n1'],
> +flags_n1generic_extra]]

After this change, 'flags_n1sdp_extra' will no longer be referenced. Then it can be removed.
> 
>  machine_args_cavium = [
>  	['default', ['-march=armv8-a+crc+crypto','-mcpu=thunderx']],
> --
> 2.16.6