[dpdk-dev] [PATCH 20.11 02/12] eal: add default SIMD bitwidth values

[David Christensen]

On 8/7/20 8:58 AM, Ciara Power wrote:
> Each arch has a define for the default SIMD bitwidth value, this is used
> on EAL init to set the config max SIMD bitwidth.

What's the intended use case?

> 
> Cc: Ruifeng Wang <ruifeng.wang at arm.com>
> Cc: Jerin Jacob <jerinj at marvell.com>
> Cc: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Cc: David Christensen <drc at linux.vnet.ibm.com>
> 
> Signed-off-by: Ciara Power <ciara.power at intel.com>
> ---
>   lib/librte_eal/arm/include/rte_vect.h      | 2 ++
>   lib/librte_eal/common/eal_common_options.c | 3 +++
>   lib/librte_eal/include/generic/rte_vect.h  | 2 ++
>   lib/librte_eal/ppc/include/rte_vect.h      | 2 ++
>   lib/librte_eal/x86/include/rte_vect.h      | 2 ++
>   5 files changed, 11 insertions(+)
> 
> diff --git a/lib/librte_eal/arm/include/rte_vect.h b/lib/librte_eal/arm/include/rte_vect.h
> index 01c51712a1..7487a53862 100644
> --- a/lib/librte_eal/arm/include/rte_vect.h
> +++ b/lib/librte_eal/arm/include/rte_vect.h
> @@ -14,6 +14,8 @@
>   extern "C" {
>   #endif
> 
> +#define RTE_DEFAULT_SIMD_BITWIDTH 256
> +
>   typedef int32x4_t xmm_t;
> 
>   #define	XMM_SIZE	(sizeof(xmm_t))
> diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
> index 90f4e8f5c3..c2a9624f89 100644
> --- a/lib/librte_eal/common/eal_common_options.c
> +++ b/lib/librte_eal/common/eal_common_options.c
> @@ -35,6 +35,7 @@
>   #ifndef RTE_EXEC_ENV_WINDOWS
>   #include <rte_telemetry.h>
>   #endif
> +#include <rte_vect.h>
> 
>   #include "eal_internal_cfg.h"
>   #include "eal_options.h"
> @@ -344,6 +345,8 @@ eal_reset_internal_config(struct internal_config *internal_cfg)
>   	internal_cfg->user_mbuf_pool_ops_name = NULL;
>   	CPU_ZERO(&internal_cfg->ctrl_cpuset);
>   	internal_cfg->init_complete = 0;
> +	internal_cfg->max_simd_bitwidth.bitwidth = RTE_DEFAULT_SIMD_BITWIDTH;
> +	internal_cfg->max_simd_bitwidth.locked = 0;
>   }

Build error on HEAD:

../lib/librte_eal/common/eal_common_options.c: In function 
‘eal_reset_internal_config’:
../lib/librte_eal/common/eal_common_options.c:347:14: error: ‘struct 
internal_config’ has no member named ‘max_simd_bitwidth’
   internal_cfg->max_simd_bitwidth.bitwidth = RTE_DEFAULT_SIMD_BITWIDTH;
               ^~
../lib/librte_eal/common/eal_common_options.c:348:14: error: ‘struct 
internal_config’ has no member named ‘max_simd_bitwidth’
   internal_cfg->max_simd_bitwidth.locked = 0;
               ^~

Dave