[dpdk-dev] [PATCH v8 06/14] build: organize Arm config into dict

[Honnappa Nagarahalli]

<snip>

> 
> Use dictionary lookup instead of checking for existing variables, iterating over
> all elements in the list or checking lists for optional configuration. Move
> variable contents into the dictionary for variables that would be referenced
> only once.
> Fallback to generic part number if the discovered part number is unknown.
> 
> Signed-off-by: Juraj Linkeš <juraj.linkes at pantheon.tech>
> ---
>  config/arm/meson.build | 282 +++++++++++++++++++++++------------------
>  1 file changed, 160 insertions(+), 122 deletions(-)
> 
> diff --git a/config/arm/meson.build b/config/arm/meson.build index
> eda485e7f..5d232f1c4 100644
> --- a/config/arm/meson.build
> +++ b/config/arm/meson.build
> @@ -28,115 +28,146 @@ flags_common_default = [
>  	['RTE_CACHE_LINE_SIZE', 128]
>  ]
> 
> -# implementer specific aarch64 flags, with middle priority -# (will overwrite
> common flags) -flags_implementer_generic = [
> -	['RTE_MACHINE', '"armv8a"'],
> -	['RTE_USE_C11_MEM_MODEL', true],
> -	['RTE_CACHE_LINE_SIZE', 128],
> -	['RTE_MAX_LCORE', 256]
> -]
> -flags_implementer_arm = [
> -	['RTE_MACHINE', '"armv8a"'],
> -	['RTE_USE_C11_MEM_MODEL', true],
> -	['RTE_CACHE_LINE_SIZE', 64],
> -	['RTE_MAX_LCORE', 16]
> -]
> -flags_implementer_cavium = [
> -	['RTE_MAX_VFIO_GROUPS', 128],
> -	['RTE_CACHE_LINE_SIZE', 128],
> -	['RTE_MAX_LCORE', 96],
> -	['RTE_MAX_NUMA_NODES', 2]
> -]
> -flags_implementer_dpaa = [
> -	['RTE_MACHINE', '"dpaa"'],
> -	['RTE_LIBRTE_DPAA2_USE_PHYS_IOVA', false],
> -	['RTE_USE_C11_MEM_MODEL', true],
> -	['RTE_CACHE_LINE_SIZE', 64],
> -	['RTE_MAX_LCORE', 16],
> -	['RTE_MAX_NUMA_NODES', 1]
> -]
> -flags_implementer_emag = [
> -	['RTE_MACHINE', '"emag"'],
> -	['RTE_CACHE_LINE_SIZE', 64],
> -	['RTE_MAX_LCORE', 32],
> -	['RTE_MAX_NUMA_NODES', 1]
> -]
> -flags_implementer_armada = [
> -	['RTE_MACHINE', '"armv8a"'],
> -	['RTE_CACHE_LINE_SIZE', 64],
> -	['RTE_MAX_LCORE', 16],
> -	['RTE_MAX_NUMA_NODES', 1]
> -]
> -
> -# part number specific aarch64 flags, with highest priority -# (will overwrite
> both common and implementer specific flags)  flags_part_number_thunderx =
> [
>  	['RTE_MACHINE', '"thunderx"'],
>  	['RTE_USE_C11_MEM_MODEL', false]
>  ]
> -flags_part_number_thunderx2 = [
> -	['RTE_MACHINE', '"thunderx2"'],
> -	['RTE_ARM_FEATURE_ATOMICS', true],
> -	['RTE_USE_C11_MEM_MODEL', true],
> -	['RTE_CACHE_LINE_SIZE', 64],
> -	['RTE_MAX_LCORE', 256],
> -	['RTE_MAX_NUMA_NODES', 2]
> -]
> -flags_part_number_octeontx2 = [
> -	['RTE_MACHINE', '"octeontx2"'],
> -	['RTE_ARM_FEATURE_ATOMICS', true],
> -	['RTE_USE_C11_MEM_MODEL', true],
> -	['RTE_EAL_IGB_UIO', false],
> -	['RTE_MAX_LCORE', 36],
> -	['RTE_MAX_NUMA_NODES', 1]
> -]
> -flags_part_number_n1generic = [
> -	['RTE_MACHINE', '"neoverse-n1"'],
> -	['RTE_ARM_FEATURE_ATOMICS', true],
> -	['RTE_USE_C11_MEM_MODEL', true],
> -	['RTE_EAL_NUMA_AWARE_HUGEPAGES', false],
> -	['RTE_LIBRTE_VHOST_NUMA', false],
> -	['RTE_MAX_MEM_MB', 1048576],
> -	['RTE_CACHE_LINE_SIZE', 64],
> -	['RTE_MAX_LCORE', 64],
> -	['RTE_MAX_NUMA_NODES', 1]
> -]
> -
> -# arm config (implementer 0x41) is the default config -
> part_number_config_arm = [
> -	['generic', ['-march=armv8-a+crc', '-moutline-atomics']],
> -	['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']],
> -	['0xd0b', ['-mcpu=cortex-a76']],
> -	['0xd0c', ['-march=armv8.2-a+crypto', '-mcpu=neoverse-n1'],
> flags_part_number_n1generic]
> -]
> -part_number_config_cavium = [
> -	['generic', ['-march=armv8-a+crc+crypto','-mcpu=thunderx']],
> -	['native', ['-march=native']],
> -	['0xa1', ['-mcpu=thunderxt88'], flags_part_number_thunderx],
> -	['0xa2', ['-mcpu=thunderxt81'], flags_part_number_thunderx],
> -	['0xa3', ['-mcpu=thunderxt83'], flags_part_number_thunderx],
> -	['0xaf', ['-march=armv8.1-a+crc+crypto','-mcpu=thunderx2t99'],
> flags_part_number_thunderx2],
> -	['0xb2', ['-march=armv8.2-a+crc+crypto+lse','-mcpu=octeontx2'],
> flags_part_number_octeontx2]
> -]
> -part_number_config_emag = [
> -	['generic', ['-march=armv8-a+crc+crypto', '-mtune=emag']],
> -	['native', ['-march=native']]
> -]
> +part_number_config_arm = {
> +	'generic': {'machine_args':  ['-march=armv8-a+crc', '-moutline-
> atomics']},
> +	'native': {'machine_args':  ['-march=native']},
> +	'0xd03': {'machine_args':  ['-mcpu=cortex-a53']},
> +	'0xd04': {'machine_args':  ['-mcpu=cortex-a35']},
> +	'0xd07': {'machine_args':  ['-mcpu=cortex-a57']},
> +	'0xd08': {'machine_args':  ['-mcpu=cortex-a72']},
> +	'0xd09': {'machine_args':  ['-mcpu=cortex-a73']},
> +	'0xd0a': {'machine_args':  ['-mcpu=cortex-a75']},
> +	'0xd0b': {'machine_args':  ['-mcpu=cortex-a76']},
> +	'0xd0c': {
> +		'machine_args':  ['-march=armv8.2-a+crypto', '-
> mcpu=neoverse-n1'],
> +		'flags': [
> +			['RTE_MACHINE', '"neoverse-n1"'],
> +			['RTE_ARM_FEATURE_ATOMICS', true],
> +			['RTE_USE_C11_MEM_MODEL', true],
> +			['RTE_EAL_NUMA_AWARE_HUGEPAGES', false],
> +			['RTE_LIBRTE_VHOST_NUMA', false],
> +			['RTE_MAX_MEM_MB', 1048576],
> +			['RTE_CACHE_LINE_SIZE', 64],
> +			['RTE_MAX_LCORE', 64],
> +			['RTE_MAX_NUMA_NODES', 1]
> +		]
> +	}
> +}
> 
> -## Arm implementer ID (MIDR in Arm Architecture Reference Manual) -
> implementer_generic = ['Generic armv8', flags_implementer_generic,
> part_number_config_arm]
> -implementer_0x41 = ['Arm', flags_implementer_arm,
> part_number_config_arm]
> -implementer_0x43 = ['Cavium', flags_implementer_cavium,
> part_number_config_cavium]
> -implementer_0x50 = ['Ampere Computing', flags_implementer_emag,
> part_number_config_emag]
> -implementer_0x56 = ['Marvell ARMADA', flags_implementer_armada,
> part_number_config_arm] -implementer_dpaa = ['NXP DPAA',
> flags_implementer_dpaa, part_number_config_arm]
> +## Arm implementers (ID from MIDR in Arm Architecture Reference Manual)
> +## Part numbers are specific to Arm implementers # implementer specific
> +aarch64 flags have middle priority
> +#     (will overwrite common flags)
> +# part number specific aarch64 flags have the highest priority
> +#     (will overwrite both common and implementer specific flags)
> +implementers = {
I think this one is big. It will grow further in the future. I like the existing one, which is dis-integrated into smaller chunks and is easy to maintain in the future.

> +	'generic': {
> +		'description': 'Generic armv8',
> +		'flags': [
> +			['RTE_MACHINE', '"armv8a"'],
> +			['RTE_USE_C11_MEM_MODEL', true],
> +			['RTE_CACHE_LINE_SIZE', 128],
> +			['RTE_MAX_LCORE', 256]
> +		],
> +		'part_number_config': part_number_config_arm
> +	},
> +	'0x41': {
> +		'description': 'Arm',
> +		'flags': [
> +			['RTE_MACHINE', '"armv8a"'],
> +			['RTE_USE_C11_MEM_MODEL', true],
> +			['RTE_CACHE_LINE_SIZE', 64],
> +			['RTE_MAX_LCORE', 16]
> +		],
> +		'part_number_config': part_number_config_arm
> +	},
> +	'0x43': {
> +		'description': 'Cavium',
> +		'flags': [
> +			['RTE_MAX_VFIO_GROUPS', 128],
> +			['RTE_CACHE_LINE_SIZE', 128],
> +			['RTE_MAX_LCORE', 96],
> +			['RTE_MAX_NUMA_NODES', 2]
> +		],
> +		'part_number_config': {
> +			'generic': {'machine_args': ['-march=armv8-
> a+crc+crypto', '-mcpu=thunderx']},
> +			'native': {'machine_args': ['-march=native']},
> +			'0xa1': {
> +				'machine_args': ['-mcpu=thunderxt88'],
> +				'flags': flags_part_number_thunderx
> +			},
> +			'0xa2': {
> +				'machine_args': ['-mcpu=thunderxt81'],
> +				'flags': flags_part_number_thunderx
> +			},
> +			'0xa3': {
> +				'machine_args': ['-mcpu=thunderxt83'],
> +				'flags': flags_part_number_thunderx
> +			},
> +			'0xaf': {
> +				'machine_args': ['-march=armv8.1-
> a+crc+crypto','-mcpu=thunderx2t99'],
> +				'flags': [
> +					['RTE_MACHINE', '"thunderx2"'],
> +					['RTE_ARM_FEATURE_ATOMICS',
> true],
> +					['RTE_USE_C11_MEM_MODEL', true],
> +					['RTE_CACHE_LINE_SIZE', 64],
> +					['RTE_MAX_LCORE', 256],
> +					['RTE_MAX_NUMA_NODES', 2]
> +				]
> +			},
> +			'0xb2': {
> +				'machine_args': ['-march=armv8.2-
> a+crc+crypto+lse','-mcpu=octeontx2'],
> +				'flags': [
> +					['RTE_MACHINE', '"octeontx2"'],
> +					['RTE_ARM_FEATURE_ATOMICS',
> true],
> +					['RTE_USE_C11_MEM_MODEL', true],
> +					['RTE_EAL_IGB_UIO', false],
> +					['RTE_MAX_LCORE', 36],
> +					['RTE_MAX_NUMA_NODES', 1]
> +				]
> +			}
> +		}
> +	},
> +	'0x50': {
> +		'description': 'Ampere Computing',
> +		'flags': [
> +			['RTE_MACHINE', '"emag"'],
> +			['RTE_CACHE_LINE_SIZE', 64],
> +			['RTE_MAX_LCORE', 32],
> +			['RTE_MAX_NUMA_NODES', 1]
> +		],
> +		'part_number_config': {
> +			'generic': {'machine_args':  ['-march=armv8-
> a+crc+crypto', '-mtune=emag']},
> +			'native': {'machine_args':  ['-march=native']}
> +		}
> +	},
> +	'0x56': {
> +		'description': 'Marvell ARMADA',
> +		'flags': [
> +			['RTE_MACHINE', '"armv8a"'],
> +			['RTE_CACHE_LINE_SIZE', 64],
> +			['RTE_MAX_LCORE', 16],
> +			['RTE_MAX_NUMA_NODES', 1]
> +		],
> +		'part_number_config': part_number_config_arm
> +	},
> +	'dpaa': {
> +		'description': 'NXP DPAA',
> +		'flags': [
> +			['RTE_MACHINE', '"dpaa"'],
> +			['RTE_LIBRTE_DPAA2_USE_PHYS_IOVA', false],
> +			['RTE_USE_C11_MEM_MODEL', true],
> +			['RTE_CACHE_LINE_SIZE', 64],
> +			['RTE_MAX_LCORE', 16],
> +			['RTE_MAX_NUMA_NODES', 1]
> +		],
> +		'part_number_config': part_number_config_arm
> +	}
> +}
> 
>  dpdk_conf.set('RTE_ARCH_ARM', 1)
>  dpdk_conf.set('RTE_FORCE_INTRINSICS', 1) @@ -152,7 +183,7 @@ else
>  	implementer_id = 'generic'
>  	if machine == 'generic' and not meson.is_cross_build()
>  		# generic build
> -		implementer_config = implementer_generic
> +		implementer_config = implementer['generic']
>  		part_number = 'generic'
>  	elif not meson.is_cross_build()
>  		# native build
> @@ -167,9 +198,9 @@ else
>  			part_number = cmd_output[3]
>  		endif
>  		# Set to generic if variable is not found
> -		implementer_config = get_variable('implementer_' +
> implementer_id, ['generic'])
> +		implementer_config = implementers.get(implementer_id,
> ['generic'])
>  		if implementer_config[0] == 'generic'
> -			implementer_config = implementer_generic
> +			implementer_config = implementer['generic']
>  			part_number = 'generic'
>  		endif
>  		if arm_force_native_march == true
> @@ -179,28 +210,35 @@ else
>  		# cross build
>  		implementer_id =
> meson.get_cross_property('implementer_id', 'generic')
>  		part_number = meson.get_cross_property('part_number',
> 'generic')
> -		implementer_config = get_variable('implementer_' +
> implementer_id)
> +		implementer_config = implementers.get(implementer_id)
>  	endif
> 
> -	message('Arm implementer: ' + implementer_config[0])
> +	message('Arm implementer: ' + implementer_config['description'])
>  	message('Arm part number: ' + part_number)
> 
> +	part_number_config = implementer_config['part_number_config']
> +	if part_number_config.has_key(part_number)
> +		# use the specified part_number machine args if found
> +		part_number_config = part_number_config[part_number]
> +	elif not meson.is_cross_build()
> +		# default to generic machine args if part_number is not found
> +		# and not forcing native machine args
> +		# but don't default in cross-builds; if part_number is specified
> +		# incorrectly in a cross-file, it needs to be fixed there
> +		part_number_config = part_number_config['generic']
> +	else
> +		# doing cross build and part number is not in
> part_number_config
> +		error('Cross build part number 0 at 0 not
> found.'.format(part_number))
> +	endif
> +
>  	# use default flags with implementer flags
> -	dpdk_flags = flags_common_default + implementer_config[1]
> +	dpdk_flags = flags_common_default + implementer_config['flags'] +
> +part_number_config.get('flags', [])
> 
> +	# apply supported machine args
>  	machine_args = [] # Clear previous machine args
> -	foreach marg: implementer_config[2]
> -		if marg[0] == part_number
> -			# apply supported machine args
> -			foreach flag: marg[1]
> -				if cc.has_argument(flag)
> -					machine_args += flag
> -				endif
> -			endforeach
> -			if marg.length() > 2
> -				# add extra flags for the part
> -				dpdk_flags += marg[2]
> -			endif
> +	foreach flag: part_number_config['machine_args']
> +		if cc.has_argument(flag)
> +			machine_args += flag
>  		endif
>  	endforeach
> 
> --
> 2.20.1