linux-kernel - [PATCH net-next v1 2/3] net: dsa: ar9331: add support for pause stats

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Date:   Fri, 24 Jun 2022 14:59:01 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Woojung Huh <woojung.huh@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Lukas Wunner <lukas@...ner.de>, UNGLinuxDriver@...rochip.com
Subject: [PATCH net-next v1 2/3] net: dsa: ar9331: add support for pause stats

Add support for pause stats and fix rx_packets/tx_packets calculation.

Pause packets are counted by raw.rx64byte/raw.tx64byte counters, so
subtract it from main rx_packets/tx_packets counters.

tx_/rx_bytes are not affected.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/dsa/qca/ar9331.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/qca/ar9331.c b/drivers/net/dsa/qca/ar9331.c
index fb3fe74abfe6..82412f54c432 100644
--- a/drivers/net/dsa/qca/ar9331.c
+++ b/drivers/net/dsa/qca/ar9331.c
@@ -231,6 +231,7 @@ struct ar9331_sw_port {
 	int idx;
 	struct delayed_work mib_read;
 	struct rtnl_link_stats64 stats;
+	struct ethtool_pause_stats pause_stats;
 	struct spinlock stats_lock;
 };
 
@@ -606,6 +607,7 @@ static void ar9331_sw_phylink_mac_link_up(struct dsa_switch *ds, int port,
 static void ar9331_read_stats(struct ar9331_sw_port *port)
 {
 	struct ar9331_sw_priv *priv = ar9331_sw_port_to_priv(port);
+	struct ethtool_pause_stats *pstats = &port->pause_stats;
 	struct rtnl_link_stats64 *stats = &port->stats;
 	struct ar9331_sw_stats_raw raw;
 	int ret;
@@ -625,9 +627,11 @@ static void ar9331_read_stats(struct ar9331_sw_port *port)
 	stats->tx_bytes += raw.txbyte;
 
 	stats->rx_packets += raw.rx64byte + raw.rx128byte + raw.rx256byte +
-		raw.rx512byte + raw.rx1024byte + raw.rx1518byte + raw.rxmaxbyte;
+		raw.rx512byte + raw.rx1024byte + raw.rx1518byte +
+		raw.rxmaxbyte - raw.rxpause;
 	stats->tx_packets += raw.tx64byte + raw.tx128byte + raw.tx256byte +
-		raw.tx512byte + raw.tx1024byte + raw.tx1518byte + raw.txmaxbyte;
+		raw.tx512byte + raw.tx1024byte + raw.tx1518byte +
+		raw.txmaxbyte - raw.txpause;
 
 	stats->rx_length_errors += raw.rxrunt + raw.rxfragment + raw.rxtoolong;
 	stats->rx_crc_errors += raw.rxfcserr;
@@ -646,6 +650,9 @@ static void ar9331_read_stats(struct ar9331_sw_port *port)
 	stats->multicast += raw.rxmulti;
 	stats->collisions += raw.txcollision;
 
+	pstats->tx_pause_frames += raw.txpause;
+	pstats->rx_pause_frames += raw.rxpause;
+
 	spin_unlock(&port->stats_lock);
 }
 
@@ -670,6 +677,17 @@ static void ar9331_get_stats64(struct dsa_switch *ds, int port,
 	spin_unlock(&p->stats_lock);
 }
 
+static void ar9331_get_pause_stats(struct dsa_switch *ds, int port,
+				   struct ethtool_pause_stats *pause_stats)
+{
+	struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+	struct ar9331_sw_port *p = &priv->port[port];
+
+	spin_lock(&p->stats_lock);
+	memcpy(pause_stats, &p->pause_stats, sizeof(*pause_stats));
+	spin_unlock(&p->stats_lock);
+}
+
 static const struct dsa_switch_ops ar9331_sw_ops = {
 	.get_tag_protocol	= ar9331_sw_get_tag_protocol,
 	.setup			= ar9331_sw_setup,
@@ -679,6 +697,7 @@ static const struct dsa_switch_ops ar9331_sw_ops = {
 	.phylink_mac_link_down	= ar9331_sw_phylink_mac_link_down,
 	.phylink_mac_link_up	= ar9331_sw_phylink_mac_link_up,
 	.get_stats64		= ar9331_get_stats64,
+	.get_pause_stats	= ar9331_get_pause_stats,
 };
 
 static irqreturn_t ar9331_sw_irq(int irq, void *data)
-- 
2.30.2