[dpdk-dev] [PATCH] bnxt: skip getting statistics for queues not started

[Stephen Hemminger <stephen@networkplumber.org>]

An application using rte_flow may define a large number of queues
but only use a small subset of them at any one time.

Since querying the status of each queue requires a request/spin/reply
with the firmware, optimize by skipping the request for queues not running.
For those queues the statistics will be 0.

This cuts the cost of single xstats query in half and has even
bigger gain for simple stats query.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/bnxt/bnxt_stats.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/bnxt/bnxt_stats.c b/drivers/net/bnxt/bnxt_stats.c
index bb4b2eee194e..11767e06d074 100644
--- a/drivers/net/bnxt/bnxt_stats.c
+++ b/drivers/net/bnxt/bnxt_stats.c
@@ -528,6 +528,8 @@ int bnxt_stats_get_op(struct rte_eth_dev *eth_dev,
 		struct bnxt_rx_queue *rxq = bp->rx_queues[i];
 		struct bnxt_cp_ring_info *cpr = rxq->cp_ring;
 
+		if (!rxq->rx_started)
+			continue;
 		rc = bnxt_hwrm_ctx_qstats(bp, cpr->hw_stats_ctx_id, i,
 				     bnxt_stats, 1);
 		if (unlikely(rc))
@@ -543,6 +545,8 @@ int bnxt_stats_get_op(struct rte_eth_dev *eth_dev,
 		struct bnxt_tx_queue *txq = bp->tx_queues[i];
 		struct bnxt_cp_ring_info *cpr = txq->cp_ring;
 
+		if (!txq->tx_started)
+			continue;
 		rc = bnxt_hwrm_ctx_qstats(bp, cpr->hw_stats_ctx_id, i,
 				     bnxt_stats, 0);
 		if (unlikely(rc))
-- 
2.30.2