[dpdk-dev] [PATCH] lib/librte_eal: support SVE flag on ARM64

[Honnappa Nagarahalli]

Hi,
	Thanks for the patch. Has this been tested on any platform (simulator, emulator etc)? Do you plan to add more code using SVE?

Thank you,
Honnappa

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Wei Hu (Xavier)
> Sent: Friday, July 17, 2020 7:08 AM
> To: dev at dpdk.org
> Cc: xavier.huwei at huawei.com
> Subject: [dpdk-dev] [PATCH] lib/librte_eal: support SVE flag on ARM64
> 
> From: Chengwen Feng <fengchengwen at huawei.com>
> 
> SVE is the next-generation SIMD extension of the ARMv8-A AArch64
> instruction set.
> The related marco definition can be found in linux kernel:
>   arch/arm64/include/uapi/asm/hwcap.h
> 
> This patch supports getting cpu SVE feature on ARM64 platform.
> 
> Signed-off-by: Chengwen Feng <fengchengwen at huawei.com>
> Signed-off-by: Wei Hu (Xavier) <xavier.huwei at huawei.com>
> ---
>  lib/librte_eal/arm/include/rte_cpuflags_64.h | 1 +
>  lib/librte_eal/arm/rte_cpuflags.c            | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/lib/librte_eal/arm/include/rte_cpuflags_64.h
> b/lib/librte_eal/arm/include/rte_cpuflags_64.h
> index 95cc014..069844d 100644
> --- a/lib/librte_eal/arm/include/rte_cpuflags_64.h
> +++ b/lib/librte_eal/arm/include/rte_cpuflags_64.h
> @@ -22,6 +22,7 @@ enum rte_cpu_flag_t {
>  	RTE_CPUFLAG_SHA2,
>  	RTE_CPUFLAG_CRC32,
>  	RTE_CPUFLAG_ATOMICS,
> +	RTE_CPUFLAG_SVE,
>  	RTE_CPUFLAG_AARCH64,
>  	/* The last item */
>  	RTE_CPUFLAG_NUMFLAGS,/**< This should always be the last! */ diff
> --git a/lib/librte_eal/arm/rte_cpuflags.c b/lib/librte_eal/arm/rte_cpuflags.c
> index caf3dc8..b1e220b 100644
> --- a/lib/librte_eal/arm/rte_cpuflags.c
> +++ b/lib/librte_eal/arm/rte_cpuflags.c
> @@ -95,6 +95,7 @@ const struct feature_entry rte_cpu_feature_table[] = {
>  	FEAT_DEF(SHA2,		REG_HWCAP,    6)
>  	FEAT_DEF(CRC32,		REG_HWCAP,    7)
>  	FEAT_DEF(ATOMICS,	REG_HWCAP,    8)
> +	FEAT_DEF(SVE,		REG_HWCAP,    22)
>  	FEAT_DEF(AARCH64,	REG_PLATFORM, 1)
>  };
>  #endif /* RTE_ARCH */
> --
> 2.7.4