netdev - [PATCH net] net: lan966x: Fix the rx drop counter

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Date:   Wed, 19 Oct 2022 10:30:56 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <UNGLinuxDriver@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net] net: lan966x: Fix the rx drop counter

Currently the rx drop is calculated as the sum of multiple HW drop
counters. The issue is that not all the HW drop counters were added for
the rx drop counter. So if for example you have a police that drops
frames, they were not see in the rx drop counter.
Fix this by updating how the rx drop counter is calculated. It is
required to add also RX_RED_PRIO_* HW counters.

Fixes: 12c2d0a5b8e2 ("net: lan966x: add ethtool configuration and statistics")
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 .../net/ethernet/microchip/lan966x/lan966x_ethtool.c   | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c
index e58a27fd8b508..fea42542be280 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c
@@ -656,7 +656,15 @@ void lan966x_stats_get(struct net_device *dev,
 	stats->rx_dropped = dev->stats.rx_dropped +
 		lan966x->stats[idx + SYS_COUNT_RX_LONG] +
 		lan966x->stats[idx + SYS_COUNT_DR_LOCAL] +
-		lan966x->stats[idx + SYS_COUNT_DR_TAIL];
+		lan966x->stats[idx + SYS_COUNT_DR_TAIL] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_0] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_1] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_2] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_3] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_4] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_5] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_6] +
+		lan966x->stats[idx + SYS_COUNT_RX_RED_PRIO_7];
 
 	for (i = 0; i < LAN966X_NUM_TC; i++) {
 		stats->rx_dropped +=
-- 
2.38.0