[PATCH 2/4] lib/power: add get and set API for pause duration

[Kevin Laatz]

Add new get/set API for configuring 'pause_duration' which used to adjust
the pause mode callback duration.

Signed-off-by: Kevin Laatz <kevin.la...@intel.com>
---
 lib/power/rte_power_pmd_mgmt.c | 26 ++++++++++++++++++++++++--
 lib/power/rte_power_pmd_mgmt.h | 31 +++++++++++++++++++++++++++++++
 lib/power/version.map          |  2 ++
 3 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/lib/power/rte_power_pmd_mgmt.c b/lib/power/rte_power_pmd_mgmt.c
index dfb7ca9187..ab92a93aa0 100644
--- a/lib/power/rte_power_pmd_mgmt.c
+++ b/lib/power/rte_power_pmd_mgmt.c
@@ -12,6 +12,7 @@
 #include "rte_power_pmd_mgmt.h"
 
 unsigned int emptypoll_max;
+unsigned int pause_duration;
 
 /* store some internal state */
 static struct pmd_conf_data {
@@ -315,6 +316,7 @@ clb_pause(uint16_t port_id __rte_unused, uint16_t qidx 
__rte_unused,
        struct queue_list_entry *queue_conf = arg;
        struct pmd_core_cfg *lcore_conf;
        const bool empty = nb_rx == 0;
+       uint32_t pause_duration = rte_power_pmd_mgmt_get_pause_duration();
 
        lcore_conf = &lcore_cfgs[lcore];
 
@@ -334,11 +336,11 @@ clb_pause(uint16_t port_id __rte_unused, uint16_t qidx 
__rte_unused,
                if (global_data.intrinsics_support.power_pause) {
                        const uint64_t cur = rte_rdtsc();
                        const uint64_t wait_tsc =
-                                       cur + global_data.tsc_per_us;
+                                       cur + global_data.tsc_per_us * 
pause_duration;
                        rte_power_pause(wait_tsc);
                } else {
                        uint64_t i;
-                       for (i = 0; i < global_data.pause_per_us; i++)
+                       for (i = 0; i < global_data.pause_per_us * 
pause_duration; i++)
                                rte_pause();
                }
        }
@@ -673,6 +675,25 @@ rte_power_pmd_mgmt_get_emptypoll_max(void)
        return emptypoll_max;
 }
 
+int
+rte_power_pmd_mgmt_set_pause_duration(unsigned int duration)
+{
+       if (duration == 0) {
+               printf("Pause duration must be greater than 0, value 
unchanged\n");
+               rte_errno = EINVAL;
+               return -1;
+       }
+       pause_duration = duration;
+
+       return 0;
+}
+
+unsigned int
+rte_power_pmd_mgmt_get_pause_duration(void)
+{
+       return pause_duration;
+}
+
 RTE_INIT(rte_power_ethdev_pmgmt_init) {
        size_t i;
 
@@ -684,4 +705,5 @@ RTE_INIT(rte_power_ethdev_pmgmt_init) {
 
        /* initialize config defaults */
        emptypoll_max = 512;
+       pause_duration = 1;
 }
diff --git a/lib/power/rte_power_pmd_mgmt.h b/lib/power/rte_power_pmd_mgmt.h
index d5a94f8187..18a9c3abb5 100644
--- a/lib/power/rte_power_pmd_mgmt.h
+++ b/lib/power/rte_power_pmd_mgmt.h
@@ -117,6 +117,37 @@ __rte_experimental
 unsigned int
 rte_power_pmd_mgmt_get_emptypoll_max(void);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice.
+ *
+ * Set the pause_duration. Used to adjust the pause mode callback duration.
+ *
+ * @note Duration must be greater than zero.
+ *
+ * @param duration
+ *   The value to set pause_duration to.
+ * @return
+ *   0 on success
+ *   <0 on error
+ */
+__rte_experimental
+int
+rte_power_pmd_mgmt_set_pause_duration(unsigned int duration);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change, or be removed, without prior notice.
+ *
+ * Get the current value of pause_duration.
+ *
+ * @return
+ *   The current pause_duration value.
+ */
+__rte_experimental
+unsigned int
+rte_power_pmd_mgmt_get_pause_duration(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/power/version.map b/lib/power/version.map
index 8bcd497e06..5890e6e429 100644
--- a/lib/power/version.map
+++ b/lib/power/version.map
@@ -42,4 +42,6 @@ EXPERIMENTAL {
        # added in 22.07
        rte_power_pmd_mgmt_set_emptypoll_max;
        rte_power_pmd_mgmt_get_emptypoll_max;
+       rte_power_pmd_mgmt_set_pause_duration;
+       rte_power_pmd_mgmt_get_pause_duration;
 };
-- 
2.31.1