[PATCH v2 1/4] lib/power: add get and set API for emptypoll max

[Kevin Laatz <kevin.laatz@intel.com>]

Add new get/set APIs to configure emptypoll max which is used to
determine when a queue can go into sleep state.

Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
---
 lib/power/rte_power_pmd_mgmt.c | 21 ++++++++++++++++++---
 lib/power/rte_power_pmd_mgmt.h | 27 +++++++++++++++++++++++++++
 lib/power/version.map          |  4 ++++
 3 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/lib/power/rte_power_pmd_mgmt.c b/lib/power/rte_power_pmd_mgmt.c
index 39a2b4cd23..dfb7ca9187 100644
--- a/lib/power/rte_power_pmd_mgmt.c
+++ b/lib/power/rte_power_pmd_mgmt.c
@@ -11,7 +11,7 @@
 
 #include "rte_power_pmd_mgmt.h"
 
-#define EMPTYPOLL_MAX  512
+unsigned int emptypoll_max;
 
 /* store some internal state */
 static struct pmd_conf_data {
@@ -206,7 +206,7 @@ queue_can_sleep(struct pmd_core_cfg *cfg, struct queue_list_entry *qcfg)
 	qcfg->n_empty_polls++;
 
 	/* if we haven't reached threshold for empty polls, we can't sleep */
-	if (qcfg->n_empty_polls <= EMPTYPOLL_MAX)
+	if (qcfg->n_empty_polls <= emptypoll_max)
 		return false;
 
 	/*
@@ -290,7 +290,7 @@ clb_umwait(uint16_t port_id, uint16_t qidx, struct rte_mbuf **pkts __rte_unused,
 	/* this callback can't do more than one queue, omit multiqueue logic */
 	if (unlikely(nb_rx == 0)) {
 		queue_conf->n_empty_polls++;
-		if (unlikely(queue_conf->n_empty_polls > EMPTYPOLL_MAX)) {
+		if (unlikely(queue_conf->n_empty_polls > emptypoll_max)) {
 			struct rte_power_monitor_cond pmc;
 			int ret;
 
@@ -661,6 +661,18 @@ rte_power_ethdev_pmgmt_queue_disable(unsigned int lcore_id,
 	return 0;
 }
 
+void
+rte_power_pmd_mgmt_set_emptypoll_max(unsigned int max)
+{
+	emptypoll_max = max;
+}
+
+unsigned int
+rte_power_pmd_mgmt_get_emptypoll_max(void)
+{
+	return emptypoll_max;
+}
+
 RTE_INIT(rte_power_ethdev_pmgmt_init) {
 	size_t i;
 
@@ -669,4 +681,7 @@ RTE_INIT(rte_power_ethdev_pmgmt_init) {
 		struct pmd_core_cfg *cfg = &lcore_cfgs[i];
 		TAILQ_INIT(&cfg->head);
 	}
+
+	/* initialize config defaults */
+	emptypoll_max = 512;
 }
diff --git a/lib/power/rte_power_pmd_mgmt.h b/lib/power/rte_power_pmd_mgmt.h
index 444e7b8a66..d5a94f8187 100644
--- a/lib/power/rte_power_pmd_mgmt.h
+++ b/lib/power/rte_power_pmd_mgmt.h
@@ -90,6 +90,33 @@ int
 rte_power_ethdev_pmgmt_queue_disable(unsigned int lcore_id,
 		uint16_t port_id, uint16_t queue_id);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice.
+ *
+ * Set a emptypoll_max to specified value. Used to specify the number of empty
+ * polls to wait before entering sleep state.
+ *
+ * @param max
+ *   The value to set emptypoll_max to.
+ */
+__rte_experimental
+void
+rte_power_pmd_mgmt_set_emptypoll_max(unsigned int max);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice.
+ *
+ * Get the current value of emptypoll_max.
+ *
+ * @return
+ *   The current emptypoll_max value
+ */
+__rte_experimental
+unsigned int
+rte_power_pmd_mgmt_get_emptypoll_max(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/power/version.map b/lib/power/version.map
index 6ec6d5d96d..812843c3f3 100644
--- a/lib/power/version.map
+++ b/lib/power/version.map
@@ -38,4 +38,8 @@ EXPERIMENTAL {
 	# added in 21.02
 	rte_power_ethdev_pmgmt_queue_disable;
 	rte_power_ethdev_pmgmt_queue_enable;
+
+	# added in 22.07
+	rte_power_pmd_mgmt_get_emptypoll_max;
+	rte_power_pmd_mgmt_set_emptypoll_max;
 };
-- 
2.31.1