[RFC,net-next,v4,10/28] net: dsa: qca8k: handle error with qca8k_rmw operation

Message ID 20210508002920.19945-10-ansuelsmth@gmail.com
State New
Headers show
Series
  • Multiple improvement to qca8k stability
Related show

Commit Message

Ansuel Smith May 8, 2021, 12:29 a.m.
qca8k_rmw can fail. Rework any user to handle error values and
correctly return.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
 drivers/net/dsa/qca8k.c | 127 ++++++++++++++++++++++++++--------------
 1 file changed, 84 insertions(+), 43 deletions(-)

Comments

Andrew Lunn May 8, 2021, 5:59 p.m. | #1
> -static void
> +static int
>  qca8k_reg_set(struct qca8k_priv *priv, u32 reg, u32 val)
>  {
> -	qca8k_rmw(priv, reg, 0, val);
> +	int ret;
> +
> +	ret = qca8k_rmw(priv, reg, 0, val);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;

This is wrong. Look at qca8k_rmw():

static u32
qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
{
	u16 r1, r2, page;
	u32 ret;

	qca8k_split_addr(reg, &r1, &r2, &page);

	mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);

	qca8k_set_page(priv->bus, page);
	ret = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
	ret &= ~mask;
	ret |= val;
	qca8k_mii_write32(priv->bus, 0x10 | r2, r1, ret);

	mutex_unlock(&priv->bus->mdio_lock);

	return ret;
}

First off, it returns a u32. So you cannot actually represent negative
error numbers.

Also, since it is returning what is now contained in the register,
that value might actually look like an error code.

I had a quick look at all the places qca8k_rmw() is called. As far as
i could see, the return value is never used. I suggest you double
check that, and then change this function. Make it return a negative
error code, or 0 on success. You can then simplify the code using the
return value.

       Andrew

Patch

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 0ec95ef16143..16ffff478de0 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -206,6 +206,9 @@  qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
 		goto exit;
 
 	ret = qca8k_mii_read32(bus, 0x10 | r2, r1);
+	if (ret < 0)
+		goto exit;
+
 	ret &= ~mask;
 	ret |= val;
 	qca8k_mii_write32(bus, 0x10 | r2, r1, ret);
@@ -216,16 +219,28 @@  qca8k_rmw(struct qca8k_priv *priv, u32 reg, u32 mask, u32 val)
 	return ret;
 }
 
-static void
+static int
 qca8k_reg_set(struct qca8k_priv *priv, u32 reg, u32 val)
 {
-	qca8k_rmw(priv, reg, 0, val);
+	int ret;
+
+	ret = qca8k_rmw(priv, reg, 0, val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
 }
 
-static void
+static int
 qca8k_reg_clear(struct qca8k_priv *priv, u32 reg, u32 val)
 {
-	qca8k_rmw(priv, reg, val, 0);
+	int ret;
+
+	ret = qca8k_rmw(priv, reg, val, 0);
+	if (ret < 0)
+		return ret;
+
+	return 0;
 }
 
 static int
@@ -573,9 +588,15 @@  qca8k_mib_init(struct qca8k_priv *priv)
 	int ret;
 
 	mutex_lock(&priv->reg_mutex);
-	qca8k_reg_set(priv, QCA8K_REG_MIB, QCA8K_MIB_FLUSH | QCA8K_MIB_BUSY);
+	ret = qca8k_reg_set(priv, QCA8K_REG_MIB, QCA8K_MIB_FLUSH | QCA8K_MIB_BUSY);
+	if (ret)
+		goto exit;
+
 	qca8k_busy_wait(priv, QCA8K_REG_MIB, QCA8K_MIB_BUSY);
-	qca8k_reg_set(priv, QCA8K_REG_MIB, QCA8K_MIB_CPU_KEEP);
+
+	ret = qca8k_reg_set(priv, QCA8K_REG_MIB, QCA8K_MIB_CPU_KEEP);
+	if (ret)
+		goto exit;
 
 	ret = qca8k_write(priv, QCA8K_REG_MODULE_EN, QCA8K_MODULE_EN_MIB);
 
@@ -751,9 +772,8 @@  qca8k_setup_mdio_bus(struct qca8k_priv *priv)
 		 * a dt-overlay and driver reload changed the configuration
 		 */
 
-		qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
-				QCA8K_MDIO_MASTER_EN);
-		return 0;
+		return qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
+				       QCA8K_MDIO_MASTER_EN);
 	}
 
 	priv->ops.phy_read = qca8k_phy_read;
@@ -786,8 +806,12 @@  qca8k_setup(struct dsa_switch *ds)
 		return ret;
 
 	/* Enable CPU Port */
-	qca8k_reg_set(priv, QCA8K_REG_GLOBAL_FW_CTRL0,
-		      QCA8K_GLOBAL_FW_CTRL0_CPU_PORT_EN);
+	ret = qca8k_reg_set(priv, QCA8K_REG_GLOBAL_FW_CTRL0,
+			    QCA8K_GLOBAL_FW_CTRL0_CPU_PORT_EN);
+	if (ret) {
+		dev_err(priv->dev, "failed enabling CPU port");
+		return ret;
+	}
 
 	/* Enable MIB counters */
 	ret = qca8k_mib_init(priv);
@@ -804,9 +828,12 @@  qca8k_setup(struct dsa_switch *ds)
 	}
 
 	/* Disable forwarding by default on all ports */
-	for (i = 0; i < QCA8K_NUM_PORTS; i++)
-		qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
-			  QCA8K_PORT_LOOKUP_MEMBER, 0);
+	for (i = 0; i < QCA8K_NUM_PORTS; i++) {
+		ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
+				QCA8K_PORT_LOOKUP_MEMBER, 0);
+		if (ret < 0)
+			return ret;
+	}
 
 	/* Disable MAC by default on all ports */
 	for (i = 1; i < QCA8K_NUM_PORTS; i++)
@@ -825,28 +852,37 @@  qca8k_setup(struct dsa_switch *ds)
 	for (i = 0; i < QCA8K_NUM_PORTS; i++) {
 		/* CPU port gets connected to all user ports of the switch */
 		if (dsa_is_cpu_port(ds, i)) {
-			qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(QCA8K_CPU_PORT),
-				  QCA8K_PORT_LOOKUP_MEMBER, dsa_user_ports(ds));
+			ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(QCA8K_CPU_PORT),
+					QCA8K_PORT_LOOKUP_MEMBER, dsa_user_ports(ds));
+			if (ret < 0)
+				return ret;
 		}
 
 		/* Individual user ports get connected to CPU port only */
 		if (dsa_is_user_port(ds, i)) {
 			int shift = 16 * (i % 2);
 
-			qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
-				  QCA8K_PORT_LOOKUP_MEMBER,
-				  BIT(QCA8K_CPU_PORT));
+			ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
+					QCA8K_PORT_LOOKUP_MEMBER,
+					BIT(QCA8K_CPU_PORT));
+			if (ret < 0)
+				return ret;
 
 			/* Enable ARP Auto-learning by default */
-			qca8k_reg_set(priv, QCA8K_PORT_LOOKUP_CTRL(i),
-				      QCA8K_PORT_LOOKUP_LEARN);
+			ret = qca8k_reg_set(priv, QCA8K_PORT_LOOKUP_CTRL(i),
+					    QCA8K_PORT_LOOKUP_LEARN);
+			if (ret)
+				return ret;
 
 			/* For port based vlans to work we need to set the
 			 * default egress vid
 			 */
-			qca8k_rmw(priv, QCA8K_EGRESS_VLAN(i),
-				  0xfff << shift,
-				  QCA8K_PORT_VID_DEF << shift);
+			ret = qca8k_rmw(priv, QCA8K_EGRESS_VLAN(i),
+					0xfff << shift,
+					QCA8K_PORT_VID_DEF << shift);
+			if (ret < 0)
+				return ret;
+
 			ret = qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(i),
 					  QCA8K_PORT_VLAN_CVID(QCA8K_PORT_VID_DEF) |
 					  QCA8K_PORT_VLAN_SVID(QCA8K_PORT_VID_DEF));
@@ -1238,7 +1274,7 @@  qca8k_port_bridge_join(struct dsa_switch *ds, int port, struct net_device *br)
 {
 	struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv;
 	int port_mask = BIT(QCA8K_CPU_PORT);
-	int i;
+	int i, ret;
 
 	for (i = 1; i < QCA8K_NUM_PORTS; i++) {
 		if (dsa_to_port(ds, i)->bridge_dev != br)
@@ -1246,17 +1282,20 @@  qca8k_port_bridge_join(struct dsa_switch *ds, int port, struct net_device *br)
 		/* Add this port to the portvlan mask of the other ports
 		 * in the bridge
 		 */
-		qca8k_reg_set(priv,
-			      QCA8K_PORT_LOOKUP_CTRL(i),
-			      BIT(port));
+		ret = qca8k_reg_set(priv,
+				    QCA8K_PORT_LOOKUP_CTRL(i),
+				    BIT(port));
+		if (ret)
+			return ret;
 		if (i != port)
 			port_mask |= BIT(i);
 	}
+
 	/* Add all other ports to this ports portvlan mask */
-	qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
-		  QCA8K_PORT_LOOKUP_MEMBER, port_mask);
+	ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
+			QCA8K_PORT_LOOKUP_MEMBER, port_mask);
 
-	return 0;
+	return ret < 0 ? ret : 0;
 }
 
 static void
@@ -1393,18 +1432,19 @@  qca8k_port_vlan_filtering(struct dsa_switch *ds, int port, bool vlan_filtering,
 			  struct netlink_ext_ack *extack)
 {
 	struct qca8k_priv *priv = ds->priv;
+	int ret;
 
 	if (vlan_filtering) {
-		qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
-			  QCA8K_PORT_LOOKUP_VLAN_MODE,
-			  QCA8K_PORT_LOOKUP_VLAN_MODE_SECURE);
+		ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
+				QCA8K_PORT_LOOKUP_VLAN_MODE,
+				QCA8K_PORT_LOOKUP_VLAN_MODE_SECURE);
 	} else {
-		qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
-			  QCA8K_PORT_LOOKUP_VLAN_MODE,
-			  QCA8K_PORT_LOOKUP_VLAN_MODE_NONE);
+		ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
+				QCA8K_PORT_LOOKUP_VLAN_MODE,
+				QCA8K_PORT_LOOKUP_VLAN_MODE_NONE);
 	}
 
-	return 0;
+	return ret < 0 ? ret : 0;
 }
 
 static int
@@ -1426,16 +1466,17 @@  qca8k_port_vlan_add(struct dsa_switch *ds, int port,
 	if (pvid) {
 		int shift = 16 * (port % 2);
 
-		qca8k_rmw(priv, QCA8K_EGRESS_VLAN(port),
-			  0xfff << shift, vlan->vid << shift);
+		ret = qca8k_rmw(priv, QCA8K_EGRESS_VLAN(port),
+				0xfff << shift, vlan->vid << shift);
+		if (ret < 0)
+			return ret;
+
 		ret = qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(port),
 				  QCA8K_PORT_VLAN_CVID(vlan->vid) |
 				  QCA8K_PORT_VLAN_SVID(vlan->vid));
-		if (ret)
-			return ret;
 	}
 
-	return 0;
+	return ret;
 }
 
 static int