netdev - [PATCH v3 net-next 03/12] net: dsa: mt7530: iterate using dsa_switch_for_each_user

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Date:   Mon,  6 Dec 2021 18:57:49 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        DENG Qingfang <dqfext@...il.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        George McCollister <george.mccollister@...il.com>
Subject: [PATCH v3 net-next 03/12] net: dsa: mt7530: iterate using dsa_switch_for_each_user_port in bridging ops

Avoid repeated calls to dsa_to_port() (some hidden behind dsa_is_user_port
and some in plain sight) by keeping two struct dsa_port references: one
to the port passed as argument, and another to the other ports of the
switch that we're iterating over.

dsa_to_port(ds, i) gets replaced by other_dp, i gets replaced by
other_port which is derived from other_dp->index, dsa_is_user_port is
handled by the DSA iterator.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v2->v3: patch is split out of "net: dsa: hide dp->bridge_dev and
        dp->bridge_num behind helpers"

 drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 22 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 9890672a206d..f7238f09d395 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -1188,27 +1188,31 @@ static int
 mt7530_port_bridge_join(struct dsa_switch *ds, int port,
 			struct net_device *bridge)
 {
-	struct mt7530_priv *priv = ds->priv;
+	struct dsa_port *dp = dsa_to_port(ds, port), *other_dp;
 	u32 port_bitmap = BIT(MT7530_CPU_PORT);
-	int i;
+	struct mt7530_priv *priv = ds->priv;
 
 	mutex_lock(&priv->reg_mutex);
 
-	for (i = 0; i < MT7530_NUM_PORTS; i++) {
+	dsa_switch_for_each_user_port(other_dp, ds) {
+		int other_port = other_dp->index;
+
+		if (dp == other_dp)
+			continue;
+
 		/* Add this port to the port matrix of the other ports in the
 		 * same bridge. If the port is disabled, port matrix is kept
 		 * and not being setup until the port becomes enabled.
 		 */
-		if (dsa_is_user_port(ds, i) && i != port) {
-			if (dsa_to_port(ds, i)->bridge_dev != bridge)
-				continue;
-			if (priv->ports[i].enable)
-				mt7530_set(priv, MT7530_PCR_P(i),
-					   PCR_MATRIX(BIT(port)));
-			priv->ports[i].pm |= PCR_MATRIX(BIT(port));
+		if (other_dp->bridge_dev != bridge)
+			continue;
 
-			port_bitmap |= BIT(i);
-		}
+		if (priv->ports[other_port].enable)
+			mt7530_set(priv, MT7530_PCR_P(other_port),
+				   PCR_MATRIX(BIT(port)));
+		priv->ports[other_port].pm |= PCR_MATRIX(BIT(port));
+
+		port_bitmap |= BIT(other_port);
 	}
 
 	/* Add the all other ports to this port matrix. */
@@ -1301,24 +1305,28 @@ static void
 mt7530_port_bridge_leave(struct dsa_switch *ds, int port,
 			 struct net_device *bridge)
 {
+	struct dsa_port *dp = dsa_to_port(ds, port), *other_dp;
 	struct mt7530_priv *priv = ds->priv;
-	int i;
 
 	mutex_lock(&priv->reg_mutex);
 
-	for (i = 0; i < MT7530_NUM_PORTS; i++) {
+	dsa_switch_for_each_user_port(other_dp, ds) {
+		int other_port = other_dp->index;
+
+		if (dp == other_dp)
+			continue;
+
 		/* Remove this port from the port matrix of the other ports
 		 * in the same bridge. If the port is disabled, port matrix
 		 * is kept and not being setup until the port becomes enabled.
 		 */
-		if (dsa_is_user_port(ds, i) && i != port) {
-			if (dsa_to_port(ds, i)->bridge_dev != bridge)
-				continue;
-			if (priv->ports[i].enable)
-				mt7530_clear(priv, MT7530_PCR_P(i),
-					     PCR_MATRIX(BIT(port)));
-			priv->ports[i].pm &= ~PCR_MATRIX(BIT(port));
-		}
+		if (other_dp->bridge_dev != bridge)
+			continue;
+
+		if (priv->ports[other_port].enable)
+			mt7530_clear(priv, MT7530_PCR_P(other_port),
+				     PCR_MATRIX(BIT(port)));
+		priv->ports[other_port].pm &= ~PCR_MATRIX(BIT(port));
 	}
 
 	/* Set the cpu port to be the only one in the port matrix of
-- 
2.25.1