Re: [dpdk-dev] [PATCH v2 2/5] eal: add accessor functions for lcore_config

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

On Wed, Apr 10, 2019 at 7:16 PM Stephen Hemminger <
stephen@networkplumber.org> wrote:

> The fields of the internal EAL core configuration are currently
> laid bare as part of the API. This is not good practice and limits
> fixing issues with layout and sizes.
>
> Make new accessor functions for the fields used by current drivers
> and examples. Mark return code functions as experimental
> since this value might change in the future and probably shouldn't
> have been used by non EAL code anyway.
>
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> Reviewed-by: David Marchand <david.marchand@redhat.com>
> ---
>  doc/guides/rel_notes/release_19_05.rst    |  6 +++
>  lib/librte_eal/common/eal_common_lcore.c  | 39 ++++++++++++++++++
>  lib/librte_eal/common/include/rte_lcore.h | 50 ++++++++++++++++-------
>  lib/librte_eal/rte_eal_version.map        | 11 +++++
>  4 files changed, 92 insertions(+), 14 deletions(-)
>
> diff --git a/doc/guides/rel_notes/release_19_05.rst
> b/doc/guides/rel_notes/release_19_05.rst
> index dbdf07a0c05b..32aae5d3bcfa 100644
> --- a/doc/guides/rel_notes/release_19_05.rst
> +++ b/doc/guides/rel_notes/release_19_05.rst
> @@ -222,6 +222,12 @@ ABI Changes
>    alignment for ``rte_crypto_asym_op`` to restore expected
> ``rte_crypto_op``
>    layout and alignment.
>
> +* eal: the lcore config structure ``struct lcore_config`` will be made
> +  internal to the EAL in a future release. This will allow the structure
> to
> +  change without impacting API or ABI. All accesses to fields of this
> +  structure should be done by the corresponding accessor functions.
> +  For example, instead of using ``lcore_config[lcore_id].socket_id``
> +  the function ``rte_lcore_socket_id(lcore_id)`` should be used instead.
>
>  Shared Library Versions
>  -----------------------
> diff --git a/lib/librte_eal/common/eal_common_lcore.c
> b/lib/librte_eal/common/eal_common_lcore.c
> index 1cbac42286ba..6cf4d7abb0bd 100644
> --- a/lib/librte_eal/common/eal_common_lcore.c
> +++ b/lib/librte_eal/common/eal_common_lcore.c
> @@ -16,6 +16,45 @@
>  #include "eal_private.h"
>  #include "eal_thread.h"
>
> +int rte_lcore_index(int lcore_id)
> +{
> +       if (unlikely(lcore_id >= RTE_MAX_LCORE))
> +               return -1;
> +
> +       if (lcore_id < 0)
> +               lcore_id = (int)rte_lcore_id();
> +
> +       return lcore_config[lcore_id].core_index;
> +}
> +
> +int rte_lcore_to_cpu_id(int lcore_id)
> +{
> +       if (unlikely(lcore_id >= RTE_MAX_LCORE))
> +               return -1;
> +
> +       if (lcore_id < 0)
> +               lcore_id = (int)rte_lcore_id();
> +
> +       return lcore_config[lcore_id].core_id;
> +}
> +
> +rte_cpuset_t rte_lcore_cpuset(unsigned int lcore_id)
> +{
> +       return lcore_config[lcore_id].cpuset;
> +}
> +
> +unsigned int
> +rte_lcore_to_socket_id(unsigned int lcore_id)
> +{
> +       return lcore_config[lcore_id].socket_id;
> +}
> +
> +int
> +rte_lcore_return_code(unsigned int lcore_id)
> +{
> +       return lcore_config[lcore_id].ret;
> +}
> +
>  static int
>  socket_id_cmp(const void *a, const void *b)
>  {
> diff --git a/lib/librte_eal/common/include/rte_lcore.h
> b/lib/librte_eal/common/include/rte_lcore.h
> index 959ef9ece4b2..dc9f3dc0843d 100644
> --- a/lib/librte_eal/common/include/rte_lcore.h
> +++ b/lib/librte_eal/common/include/rte_lcore.h
> @@ -121,15 +121,8 @@ rte_lcore_count(void)
>   * @return
>   *   The relative index, or -1 if not enabled.
>   */
> -static inline int
> -rte_lcore_index(int lcore_id)
> -{
> -       if (lcore_id >= RTE_MAX_LCORE)
> -               return -1;
> -       if (lcore_id < 0)
> -               lcore_id = (int)rte_lcore_id();
> -       return lcore_config[lcore_id].core_index;
> -}
> +int __rte_experimental
> +rte_lcore_index(int lcore_id);
>

This is new from v2.
Please remove this __rte_experimental tag.



>  /**
>   * Return the ID of the physical socket of the logical core we are
> @@ -177,11 +170,40 @@ rte_socket_id_by_idx(unsigned int idx);
>   * @return
>   *   the ID of lcoreid's physical socket
>   */
> -static inline unsigned int
> -rte_lcore_to_socket_id(unsigned int lcore_id)
> -{
> -       return lcore_config[lcore_id].socket_id;
> -}
> +unsigned int
> +rte_lcore_to_socket_id(unsigned int lcore_id);
> +
> +/**
> + * Return the id of the lcore on a socket starting from zero.
> + *
> + * @param lcore_id
> + *   The targeted lcore, or -1 for the current one.
> + * @return
> + *   The relative index, or -1 if not enabled.
> + */
> +int
> +rte_lcore_to_cpu_id(int lcore_id);
> +
> +/**
> + * Return the cpuset for a given lcore.
> + * @param lcore_id
> + *   the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
> + * @return
> + *   The cpuset of that lcore
> + */
> +rte_cpuset_t
> +rte_lcore_cpuset(unsigned int lcore_id);
> +
> +/**
> + * Get the return code from a lcore thread.
> + * @param lcore_id
> + *   the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1
> + *   and finished
> + * @return
> + *   the return code from the lcore thread
> + */
> +int __rte_experimental
> +rte_lcore_return_code(unsigned int lcore_id);
>
>  /**
>   * Test if an lcore is enabled.
> diff --git a/lib/librte_eal/rte_eal_version.map
> b/lib/librte_eal/rte_eal_version.map
> index d6e375135ad1..f6688327cad3 100644
> --- a/lib/librte_eal/rte_eal_version.map
> +++ b/lib/librte_eal/rte_eal_version.map
> @@ -268,6 +268,16 @@ DPDK_18.11 {
>
>  } DPDK_18.08;
>
> +DPDK_19.05 {
> +       global:
> +
> +       rte_lcore_cpuset;
> +       rte_lcore_index;
> +       rte_lcore_to_cpu_id;
> +       rte_lcore_to_socket_id;
> +
> +} DPDK_18.08;
> +
>

19.05 inherits from 18.11 not 18.08.


 EXPERIMENTAL {
>         global:
>
> @@ -329,6 +339,7 @@ EXPERIMENTAL {
>         rte_fbarray_set_free;
>         rte_fbarray_set_used;
>         rte_intr_callback_unregister_pending;
> +       rte_lcore_return_code;
>         rte_log_register_type_and_pick_level;
>         rte_malloc_dump_heaps;
>         rte_malloc_heap_create;
> --
> 2.17.1
>


And with these two changes, renewing my tag.
Reviewed-by: David Marchand <david.marchand@redhat.com>


-- 
David Marchand