Re: [dpdk-dev] [PATCH v2] eal: promote some service core functions to stable

["Eads, Gage" <gage.eads@intel.com>]

On Thu, Jun 20, 2019 at 9:03 PM Gage Eads <gage.eads@intel.com<mailto:gage.eads@intel.com>> wrote:
The functions rte_service_may_be_active(), rte_service_lcore_attr_get(),
and rte_service_attr_reset_all() were introduced nearly a year ago in DPDK
18.08. They can be considered non-experimental for the 19.08 release.

rte_service_may_be_active() is used by the sw PMD, and this commit allows
it to not need any experimental API.

Signed-off-by: Gage Eads <gage.eads@intel.com<mailto:gage.eads@intel.com>>
---
 drivers/event/sw/Makefile                   |  1 -
 drivers/event/sw/meson.build                |  1 -
 lib/librte_eal/common/include/rte_service.h | 15 +++------------
 lib/librte_eal/common/rte_service.c         |  6 +++---
 lib/librte_eal/rte_eal_version.map          |  6 +++---
 5 files changed, 9 insertions(+), 20 deletions(-)

v2: add allow-experimental flag back to eventdev, which still uses an
    experimental cryptodev API

diff --git a/drivers/event/sw/Makefile b/drivers/event/sw/Makefile
index 81236a392..c6600e836 100644
--- a/drivers/event/sw/Makefile
+++ b/drivers/event/sw/Makefile
@@ -7,7 +7,6 @@ include $(RTE_SDK)/mk/rte.vars.mk<http://rte.vars.mk>
 LIB = librte_pmd_sw_event.a

 # build flags
-CFLAGS += -DALLOW_EXPERIMENTAL_API
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS)
 # for older GCC versions, allow us to initialize an event using
diff --git a/drivers/event/sw/meson.build b/drivers/event/sw/meson.build
index 30d221647..985012219 100644
--- a/drivers/event/sw/meson.build
+++ b/drivers/event/sw/meson.build
@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation

-allow_experimental_apis = true
 sources = files('sw_evdev_scheduler.c',
        'sw_evdev_selftest.c',
        'sw_evdev_worker.c',
diff --git a/lib/librte_eal/common/include/rte_service.h b/lib/librte_eal/common/include/rte_service.h
index bf25aec35..d8701dd4c 100644
--- a/lib/librte_eal/common/include/rte_service.h
+++ b/lib/librte_eal/common/include/rte_service.h
@@ -162,9 +162,6 @@ int32_t rte_service_runstate_set(uint32_t id, uint32_t runstate);
 int32_t rte_service_runstate_get(uint32_t id);

 /**
- * @warning
- * @b EXPERIMENTAL: this API may change, or be removed, without prior notice
- *
  * This function returns whether the service may be currently executing on
  * at least one lcore, or definitely is not. This function can be used to
  * determine if, after setting the service runstate to stopped, the service
@@ -178,7 +175,7 @@ int32_t rte_service_runstate_get(uint32_t id);
  * @retval 0 Service is not running on any lcore
  * @retval -EINVAL Invalid service id
  */
-int32_t __rte_experimental
+int32_t
 rte_service_may_be_active(uint32_t id);

 /**
@@ -389,9 +386,6 @@ int32_t rte_service_attr_reset_all(uint32_t id);
 #define RTE_SERVICE_LCORE_ATTR_LOOPS 0

 /**
- * @warning
- * @b EXPERIMENTAL: this API may change without prior notice
- *
  * Get an attribute from a service core.
  *
  * @param lcore Id of the service core.
@@ -401,14 +395,11 @@ int32_t rte_service_attr_reset_all(uint32_t id);
  *         -EINVAL Invalid lcore, attr_id or attr_value was NULL.
  *         -ENOTSUP lcore is not a service core.
  */
-int32_t __rte_experimental
+int32_t
 rte_service_lcore_attr_get(uint32_t lcore, uint32_t attr_id,
                           uint64_t *attr_value);

 /**
- * @warning
- * @b EXPERIMENTAL: this API may change without prior notice
- *
  * Reset all attribute values of a service core.
  *
  * @param lcore The service core to reset all the statistics of
@@ -416,7 +407,7 @@ rte_service_lcore_attr_get(uint32_t lcore, uint32_t attr_id,
  *         -EINVAL Invalid service id provided
  *         -ENOTSUP lcore is not a service core.
  */
-int32_t __rte_experimental
+int32_t
 rte_service_lcore_attr_reset_all(uint32_t lcore);

It seems we want to return errors via the return code.
Error codes from errno.h are int so we are fine with int only.

What is the reason why this is returning a int32_t ?

Simply to match the other (non-experimental) rte_service_* functions that return int32_t.