Re: [dpdk-dev] [PATCH v3 13/14] eal: unify internal config initialization

[David Marchand <david.marchand@redhat.com>]

On Thu, Jun 27, 2019 at 1:39 PM Anatoly Burakov <anatoly.burakov@intel.com>
wrote:

> Currently, each EAL will update internal/shared config in their
> own way at init, resulting in needless duplication of code and
> OS-dependent behavior. Move the functions to a common file and
> add missing FreeBSD steps.
>
> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
> ---
>  lib/librte_eal/common/eal_common_mcfg.c | 18 ++++++++++++++++++
>  lib/librte_eal/common/eal_memcfg.h      |  8 ++++++++
>  lib/librte_eal/freebsd/eal/eal.c        |  2 ++
>  lib/librte_eal/linux/eal/eal.c          | 22 ++--------------------
>  4 files changed, 30 insertions(+), 20 deletions(-)
>
> diff --git a/lib/librte_eal/common/eal_common_mcfg.c
> b/lib/librte_eal/common/eal_common_mcfg.c
> index dc6665d6a..fe8d2b726 100644
> --- a/lib/librte_eal/common/eal_common_mcfg.c
> +++ b/lib/librte_eal/common/eal_common_mcfg.c
> @@ -31,6 +31,24 @@ eal_mcfg_wait_complete(void)
>                 rte_pause();
>  }
>
> +void
> +eal_mcfg_update_internal(void)
> +{
> +       struct rte_mem_config *mcfg =
> rte_eal_get_configuration()->mem_config;
> +
> +       internal_config.legacy_mem = mcfg->legacy_mem;
> +       internal_config.single_file_segments = mcfg->single_file_segments;
> +}
> +
> +void
> +eal_mcfg_update_from_internal(void)
> +{
> +       struct rte_mem_config *mcfg =
> rte_eal_get_configuration()->mem_config;
> +
> +       mcfg->legacy_mem = internal_config.legacy_mem;
> +       mcfg->single_file_segments = internal_config.single_file_segments;
> +}
> +
>  void
>  rte_mcfg_mem_read_lock(void)
>  {
> diff --git a/lib/librte_eal/common/eal_memcfg.h
> b/lib/librte_eal/common/eal_memcfg.h
> index a2434417e..d02ac1621 100644
> --- a/lib/librte_eal/common/eal_memcfg.h
> +++ b/lib/librte_eal/common/eal_memcfg.h
> @@ -68,6 +68,14 @@ struct rte_mem_config {
>         uint8_t dma_maskbits;
>  };
>
> +/* update internal config from shared mem config */
> +void
> +eal_mcfg_update_internal(void);
> +
> +/* update shared mem config from internal config */
> +void
> +eal_mcfg_update_from_internal(void);
> +
>  /* wait until primary process initialization is complete */
>  void
>  eal_mcfg_wait_complete(void);
> diff --git a/lib/librte_eal/freebsd/eal/eal.c
> b/lib/librte_eal/freebsd/eal/eal.c
> index 13e230fc8..6bfe203fd 100644
> --- a/lib/librte_eal/freebsd/eal/eal.c
> +++ b/lib/librte_eal/freebsd/eal/eal.c
> @@ -379,6 +379,7 @@ rte_config_init(void)
>         case RTE_PROC_PRIMARY:
>                 if (rte_eal_config_create() < 0)
>                         return -1;
> +               eal_mcfg_update_internal();
>                 break;
>         case RTE_PROC_SECONDARY:
>                 if (rte_eal_config_attach() < 0)
> @@ -386,6 +387,7 @@ rte_config_init(void)
>                 eal_mcfg_wait_complete();
>                 if (rte_eal_config_reattach() < 0)
>                         return -1;
> +               eal_mcfg_update_from_internal();
>                 break;
>         case RTE_PROC_AUTO:
>         case RTE_PROC_INVALID:
>


Hum, you swapped eal_mcfg_update_internal and eal_mcfg_update_from_internal.
The names are a bit ambiguous, and I wonder if we really need those
separate helpers.

rte_eal_config_create and rte_eal_config_attach are already awfully close
in linux and freebsd implementation.
Can't we have them as common code and put those helpers bits direct in them
?




> diff --git a/lib/librte_eal/linux/eal/eal.c
> b/lib/librte_eal/linux/eal/eal.c
> index 4fd18b15f..fa205fd29 100644
> --- a/lib/librte_eal/linux/eal/eal.c
> +++ b/lib/librte_eal/linux/eal/eal.c
> @@ -472,24 +472,6 @@ eal_proc_type_detect(void)
>         return ptype;
>  }
>
> -/* copies data from internal config to shared config */
> -static void
> -eal_update_mem_config(void)
> -{
> -       struct rte_mem_config *mcfg =
> rte_eal_get_configuration()->mem_config;
> -       mcfg->legacy_mem = internal_config.legacy_mem;
> -       mcfg->single_file_segments = internal_config.single_file_segments;
> -}
> -
> -/* copies data from shared config to internal config */
> -static void
> -eal_update_internal_config(void)
> -{
> -       struct rte_mem_config *mcfg =
> rte_eal_get_configuration()->mem_config;
> -       internal_config.legacy_mem = mcfg->legacy_mem;
> -       internal_config.single_file_segments = mcfg->single_file_segments;
> -}
> -
>  /* Sets up rte_config structure with the pointer to shared memory
> config.*/
>  static int
>  rte_config_init(void)
> @@ -500,7 +482,7 @@ rte_config_init(void)
>         case RTE_PROC_PRIMARY:
>                 if (rte_eal_config_create() < 0)
>                         return -1;
> -               eal_update_mem_config();
> +               eal_mcfg_update_from_internal();
>                 break;
>         case RTE_PROC_SECONDARY:
>                 if (rte_eal_config_attach() < 0)
> @@ -508,7 +490,7 @@ rte_config_init(void)
>                 eal_mcfg_wait_complete();
>                 if (rte_eal_config_reattach() < 0)
>                         return -1;
> -               eal_update_internal_config();
> +               eal_mcfg_update_internal();
>                 break;
>         case RTE_PROC_AUTO:
>         case RTE_PROC_INVALID:
> --
> 2.17.1
>


-- 
David Marchand