[dpdk-dev] [PATCH] service: add new `rte_service_lcore_count_services` API

[Pavan Nikhilesh]

This new API returns the number of services that are running on a specific
service core. It allows an application to decide which service core to run
a new service on.

Signed-off-by: Pavan Nikhilesh <pbhagavatula at caviumnetworks.com>
---
 lib/librte_eal/common/include/rte_service.h | 12 ++++++++++++
 lib/librte_eal/common/rte_service.c         | 11 +++++++++++
 2 files changed, 23 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_service.h b/lib/librte_eal/common/include/rte_service.h
index 7c6f738..5f0904f 100644
--- a/lib/librte_eal/common/include/rte_service.h
+++ b/lib/librte_eal/common/include/rte_service.h
@@ -374,6 +374,18 @@ int32_t rte_service_lcore_list(uint32_t array[], uint32_t n);
  * @warning
  * @b EXPERIMENTAL: this API may change without prior notice
  *
+ * Get the numer of services running on the supplied lcore.
+ *
+ * @param Lcore Id of the service core.
+ * @retval >=0 Number of services registered to this core.
+ * @retval -EINVAL The provided lcore is not a service core.
+ */
+int32_t rte_service_lcore_count_services(uint32_t lcore);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
  * Dumps any information available about the service. If service is NULL,
  * dumps info for all services.
  */
diff --git a/lib/librte_eal/common/rte_service.c b/lib/librte_eal/common/rte_service.c
index 7efb76d..ddaed22 100644
--- a/lib/librte_eal/common/rte_service.c
+++ b/lib/librte_eal/common/rte_service.c
@@ -397,6 +397,17 @@ rte_service_lcore_list(uint32_t array[], uint32_t n)
 }
 
 int32_t
+rte_service_lcore_count_services(uint32_t lcore)
+{
+	struct core_state *cs = &lcore_states[lcore];
+
+	if (!cs->is_service_core)
+		return -EINVAL;
+
+	return __builtin_popcountll(cs->service_mask);
+}
+
+int32_t
 rte_service_start_with_defaults(void)
 {
 	/* create a default mapping from cores to services, then start the
-- 
2.7.4