[Intel-wired-lan] [PATCH net v4] iavf: Fix displaying queue statistics shown by ethtool

* [Intel-wired-lan] [PATCH net v4] iavf: Fix displaying queue statistics shown by ethtool
@ 2021-09-17  8:52 Jedrzej Jagielski
  2021-10-27  9:43 ` Jankowski, Konrad0
  0 siblings, 1 reply; 2+ messages in thread
From: Jedrzej Jagielski @ 2021-09-17  8:52 UTC (permalink / raw)
  To: intel-wired-lan

Driver provided too many lines as an output to ethtool -S command.
Return actual length of string set of ethtool stats. Instead of predefined
maximal value use the actual value on netdev, iterate over active queues.
Without this patch, ethtool -S report would produce additional
erroneous lines.

Without this change in statistics after showing them by ethtool -S
will be displayed queues that are not configured.

Fixes: 6dba41cd02fc ("i40evf: update ethtool stats code and use helper functions")
Signed-off-by: Witold Fijalkowski <witoldx.fijalkowski@intel.com>
Signed-off-by: Przemyslaw Patynowski <przemyslawx.patynowski@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
---
V2: Fix commit message
V3: Squash patch 5d12f51b9820 ("iavf: Fix ethtool -S output")
V4: Remove one blank line

 .../net/ethernet/intel/iavf/iavf_ethtool.c    | 30 ++++++++++++-------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index 7cbe59beeebb..014db92d33be 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -331,9 +331,16 @@ static int iavf_get_link_ksettings(struct net_device *netdev,
  **/
 static int iavf_get_sset_count(struct net_device *netdev, int sset)
 {
+	/* Report the maximum number queues, even if not every queue is
+	 * currently configured. Since allocation of queues is in pairs,
+	 * use netdev->real_num_tx_queues * 2. The real_num_tx_queues is set
+	 * at device creation and never changes.
+	 */
+
 	if (sset == ETH_SS_STATS)
 		return IAVF_STATS_LEN +
-			(IAVF_QUEUE_STATS_LEN * 2 * IAVF_MAX_REQ_QUEUES);
+			(IAVF_QUEUE_STATS_LEN * 2 *
+			 netdev->real_num_tx_queues);
 	else if (sset == ETH_SS_PRIV_FLAGS)
 		return IAVF_PRIV_FLAGS_STR_LEN;
 	else
@@ -357,17 +364,18 @@ static void iavf_get_ethtool_stats(struct net_device *netdev,
 	iavf_add_ethtool_stats(&data, adapter, iavf_gstrings_stats);
 
 	rcu_read_lock();
-	for (i = 0; i < IAVF_MAX_REQ_QUEUES; i++) {
+	/* As num_active_queues describe both tx and rx queues, we can use
+	 * it to iterate over rings' stats.
+	 */
+	for (i = 0; i < adapter->num_active_queues; i++) {
 		struct iavf_ring *ring;
 
-		/* Avoid accessing un-allocated queues */
-		ring = (i < adapter->num_active_queues ?
-			&adapter->tx_rings[i] : NULL);
+		/* Tx rings stats */
+		ring = &adapter->tx_rings[i];
 		iavf_add_queue_stats(&data, ring);
 
-		/* Avoid accessing un-allocated queues */
-		ring = (i < adapter->num_active_queues ?
-			&adapter->rx_rings[i] : NULL);
+		/* Rx rings stats */
+		ring = &adapter->rx_rings[i];
 		iavf_add_queue_stats(&data, ring);
 	}
 	rcu_read_unlock();
@@ -404,10 +412,10 @@ static void iavf_get_stat_strings(struct net_device *netdev, u8 *data)
 
 	iavf_add_stat_strings(&data, iavf_gstrings_stats);
 
-	/* Queues are always allocated in pairs, so we just use num_tx_queues
-	 * for both Tx and Rx queues.
+	/* Queues are always allocated in pairs, so we just use
+	 * real_num_tx_queues for both Tx and Rx queues.
 	 */
-	for (i = 0; i < netdev->num_tx_queues; i++) {
+	for (i = 0; i < netdev->real_num_tx_queues; i++) {
 		iavf_add_stat_strings(&data, iavf_gstrings_queue_stats,
 				      "tx", i);
 		iavf_add_stat_strings(&data, iavf_gstrings_queue_stats,
-- 
2.27.0


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