Re: [dpdk-dev] [PATCH 1/2] build: add option for armv8 crypto extension

[Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>]

> Per armv8 crypto extension support, make build always enable it by default
> as long as compiler supports the feature while meson build only enables it for
> 'default' machine of generic armv8 architecture. For example, specifying '-
> mcpu=cortex-a72' doesn't enable it but '+crypto' is required in order to
> enable the feature.
> 
> It is also known that not all the armv8 platforms have the crypto extension.
> For example, Mellanox BlueField has a variant which doesn't have it. If crypto
> enabled binary runs on such a platform, rte_eal_init() fails.
> 
> Therefore, an option to control this feature is necessary. It is still enabled by
> default but can be selectively disabled by vendors.
The distro/binary portable image needs to be built without crypto. Only the crypto drivers need to be built with crypto and at run time we need to hook up the correct function pointers. So, IMO, by default crypto should be disabled and should be enabled in specific target machine configs. 

> 
> Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
> ---
>  config/arm/meson.build        | 16 +++++++++-------
>  config/common_armv8a_linux    |  1 +
>  drivers/crypto/armv8/Makefile |  4 ++++
>  meson_options.txt             |  2 ++
>  mk/machine/armv8a/rte.vars.mk |  4 ++++
>  5 files changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/config/arm/meson.build b/config/arm/meson.build index
> 7fa6ed3105..3b53842d08 100644
> --- a/config/arm/meson.build
> +++ b/config/arm/meson.build
> @@ -8,6 +8,8 @@ march_opt = '-march=@0@'.format(machine)
> arm_force_native_march = false  arm_force_default_march = (machine ==
> 'default')
> 
> +crypto_flag = get_option('enable_armv8_crypto') ? '+crypto' : ''
> +
>  flags_common_default = [
>  	# Accelarate rte_memcpy. Be sure to run unit test
> (memcpy_perf_autotest)
>  	# to determine the best threshold in code. Refer to notes in source
> file @@ -74,14 +76,14 @@ flags_octeontx2_extra = [
>  	['RTE_USE_C11_MEM_MODEL', true]]
> 
>  machine_args_generic = [
> -	['default', ['-march=armv8-a+crc+crypto']],
> +	['default', ['-march=armv8-a+crc' + crypto_flag]],
>  	['native', ['-march=native']],
> -	['0xd03', ['-mcpu=cortex-a53']],
> -	['0xd04', ['-mcpu=cortex-a35']],
> -	['0xd07', ['-mcpu=cortex-a57']],
> -	['0xd08', ['-mcpu=cortex-a72']],
> -	['0xd09', ['-mcpu=cortex-a73']],
> -	['0xd0a', ['-mcpu=cortex-a75']]]
> +	['0xd03', ['-mcpu=cortex-a53' + crypto_flag]],
> +	['0xd04', ['-mcpu=cortex-a35' + crypto_flag]],
> +	['0xd07', ['-mcpu=cortex-a57' + crypto_flag]],
> +	['0xd08', ['-mcpu=cortex-a72' + crypto_flag]],
> +	['0xd09', ['-mcpu=cortex-a73' + crypto_flag]],
> +	['0xd0a', ['-mcpu=cortex-a75' + crypto_flag]]]
> 
>  machine_args_cavium = [
>  	['default', ['-march=armv8-a+crc+crypto','-mcpu=thunderx']],
> diff --git a/config/common_armv8a_linux b/config/common_armv8a_linux
> index 72091de1c7..0efa3e2eb2 100644
> --- a/config/common_armv8a_linux
> +++ b/config/common_armv8a_linux
> @@ -5,6 +5,7 @@
>  #include "common_linux"
> 
>  CONFIG_RTE_MACHINE="armv8a"
> +CONFIG_RTE_ENABLE_ARMV8_CRYPTO=y
> 
>  CONFIG_RTE_ARCH="arm64"
>  CONFIG_RTE_ARCH_ARM64=y
> diff --git a/drivers/crypto/armv8/Makefile b/drivers/crypto/armv8/Makefile
> index f71f6b14a4..867a5206cf 100644
> --- a/drivers/crypto/armv8/Makefile
> +++ b/drivers/crypto/armv8/Makefile
> @@ -4,6 +4,10 @@
> 
>  include $(RTE_SDK)/mk/rte.vars.mk
> 
> +ifneq ($(CONFIG_RTE_ENABLE_ARMV8_CRYPTO),y)
> +$(error "Please enable CONFIG_RTE_ENABLE_ARMV8_CRYPTO") endif
> +
>  ifneq ($(MAKECMDGOALS),clean)
>  ifneq ($(MAKECMDGOALS),config)
>  ifeq ($(ARMV8_CRYPTO_LIB_PATH),)
> diff --git a/meson_options.txt b/meson_options.txt index
> 16d9f92c65..4ca09771de 100644
> --- a/meson_options.txt
> +++ b/meson_options.txt
> @@ -4,6 +4,8 @@ option('allow_invalid_socket_id', type: 'boolean', value:
> false,
>  	description: 'allow out-of-range NUMA socket id\'s for platforms that
> don\'t report the value correctly')  option('drivers_install_subdir', type:
> 'string', value: 'dpdk/pmds-<VERSION>',
>  	description: 'Subdirectory of libdir where to install PMDs. Defaults to
> using a versioned subdirectory.')
> +option('enable_armv8_crypto', type: 'boolean', value: true,
> +	description: 'enable armv8 crypto extension')
>  option('enable_docs', type: 'boolean', value: false,
>  	description: 'build documentation')
>  option('enable_kmods', type: 'boolean', value: true, diff --git
> a/mk/machine/armv8a/rte.vars.mk b/mk/machine/armv8a/rte.vars.mk index
> 8252efbb7b..4893d01a2d 100644
> --- a/mk/machine/armv8a/rte.vars.mk
> +++ b/mk/machine/armv8a/rte.vars.mk
> @@ -28,4 +28,8 @@
>  # CPU_LDFLAGS =
>  # CPU_ASFLAGS =
> 
> +ifeq ($(CONFIG_RTE_ENABLE_ARMV8_CRYPTO),y)
>  MACHINE_CFLAGS += -march=armv8-a+crc+crypto
> +else
> +MACHINE_CFLAGS += -march=armv8-a+crc
> +endif
> --
> 2.11.0