[dpdk-dev] [PATCH v1 1/1] power: fix multi-queue scale mode for pmd mgmt

[Anatoly Burakov <anatoly.burakov@intel.com>]

Currently in scale mode, multi-queue initialization will attempt to
initialize and de-initialize the per-lcore power library structures
multiple times. Fix it to only do this whenever we either enabling
first queue or disabling last queue.

Fixes: 5dff9a72b0ef ("power: support callbacks for multiple Rx queues")

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/power/rte_power_pmd_mgmt.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/lib/power/rte_power_pmd_mgmt.c b/lib/power/rte_power_pmd_mgmt.c
index 2586204b93..0ce40f0875 100644
--- a/lib/power/rte_power_pmd_mgmt.c
+++ b/lib/power/rte_power_pmd_mgmt.c
@@ -534,11 +534,15 @@ rte_power_ethdev_pmgmt_queue_enable(unsigned int lcore_id, uint16_t port_id,
 		clb = get_monitor_callback();
 		break;
 	case RTE_POWER_MGMT_TYPE_SCALE:
-		/* check if we can add a new queue */
-		ret = check_scale(lcore_id);
-		if (ret < 0)
-			goto end;
 		clb = clb_scale_freq;
+
+		/* we only have to check this when enabling first queue */
+		if (lcore_cfg->pwr_mgmt_state != PMD_MGMT_DISABLED)
+			break;
+		/* check if we can add a new queue */
+		ret = check_scale(lcore_id);
+		if (ret < 0)
+			goto end;
 		break;
 	case RTE_POWER_MGMT_TYPE_PAUSE:
 		/* figure out various time-to-tsc conversions */
@@ -633,9 +637,12 @@ rte_power_ethdev_pmgmt_queue_disable(unsigned int lcore_id,
 		rte_eth_remove_rx_callback(port_id, queue_id, queue_cfg->cb);
 		break;
 	case RTE_POWER_MGMT_TYPE_SCALE:
-		rte_power_freq_max(lcore_id);
 		rte_eth_remove_rx_callback(port_id, queue_id, queue_cfg->cb);
-		rte_power_exit(lcore_id);
+		/* disable power library on this lcore if this was last queue */
+		if (lcore_cfg->pwr_mgmt_state == PMD_MGMT_DISABLED) {
+			rte_power_freq_max(lcore_id);
+			rte_power_exit(lcore_id);
+		}
 		break;
 	}
 	/*
-- 
2.25.1