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Date:   Sat,  9 Nov 2019 15:02:47 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     jakub.kicinski@...ronome.com, davem@...emloft.net,
        alexandre.belloni@...tlin.com
Cc:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        joergen.andreasen@...rochip.com, allan.nielsen@...rochip.com,
        horatiu.vultur@...rochip.com, claudiu.manoil@....com,
        netdev@...r.kernel.org, Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net-next 01/15] net: mscc: ocelot: break apart ocelot_vlan_port_apply

From: Vladimir Oltean <vladimir.oltean@....com>

This patch transforms the ocelot_vlan_port_apply function ("apply
what?") into 3 standalone functions:

- ocelot_port_vlan_filtering
- ocelot_port_set_native_vlan
- ocelot_port_set_pvid

These functions have a prototype that is better aligned to the DSA API.

The function also had some static initialization (TPID, drop frames with
multicast source MAC) which was not being changed from any place, so
that was just moved to ocelot_probe_port (one of the 6 callers of
ocelot_vlan_port_apply).

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 168 +++++++++++++++++------------
 1 file changed, 100 insertions(+), 68 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 672ea1342add..029c5ea59e35 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -185,65 +185,97 @@ static void ocelot_vlan_mode(struct ocelot_port *port,
 	ocelot_write(ocelot, val, ANA_VLANMASK);
 }
 
-static void ocelot_vlan_port_apply(struct ocelot *ocelot,
-				   struct ocelot_port *port)
+static void ocelot_port_vlan_filtering(struct ocelot *ocelot, int port,
+				       bool vlan_aware)
 {
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
 	u32 val;
 
-	/* Ingress clasification (ANA_PORT_VLAN_CFG) */
-	/* Default vlan to clasify for untagged frames (may be zero) */
-	val = ANA_PORT_VLAN_CFG_VLAN_VID(port->pvid);
-	if (port->vlan_aware)
-		val |= ANA_PORT_VLAN_CFG_VLAN_AWARE_ENA |
-		       ANA_PORT_VLAN_CFG_VLAN_POP_CNT(1);
-
+	if (vlan_aware)
+		val = ANA_PORT_VLAN_CFG_VLAN_AWARE_ENA |
+		      ANA_PORT_VLAN_CFG_VLAN_POP_CNT(1);
+	else
+		val = 0;
 	ocelot_rmw_gix(ocelot, val,
-		       ANA_PORT_VLAN_CFG_VLAN_VID_M |
 		       ANA_PORT_VLAN_CFG_VLAN_AWARE_ENA |
 		       ANA_PORT_VLAN_CFG_VLAN_POP_CNT_M,
-		       ANA_PORT_VLAN_CFG, port->chip_port);
+		       ANA_PORT_VLAN_CFG, port);
 
-	/* Drop frames with multicast source address */
-	val = ANA_PORT_DROP_CFG_DROP_MC_SMAC_ENA;
-	if (port->vlan_aware && !port->vid)
+	if (vlan_aware && !ocelot_port->vid)
 		/* If port is vlan-aware and tagged, drop untagged and priority
 		 * tagged frames.
 		 */
-		val |= ANA_PORT_DROP_CFG_DROP_UNTAGGED_ENA |
+		val = ANA_PORT_DROP_CFG_DROP_UNTAGGED_ENA |
+		      ANA_PORT_DROP_CFG_DROP_PRIO_S_TAGGED_ENA |
+		      ANA_PORT_DROP_CFG_DROP_PRIO_C_TAGGED_ENA;
+	else
+		val = 0;
+	ocelot_rmw_gix(ocelot, val,
+		       ANA_PORT_DROP_CFG_DROP_UNTAGGED_ENA |
 		       ANA_PORT_DROP_CFG_DROP_PRIO_S_TAGGED_ENA |
-		       ANA_PORT_DROP_CFG_DROP_PRIO_C_TAGGED_ENA;
-	ocelot_write_gix(ocelot, val, ANA_PORT_DROP_CFG, port->chip_port);
-
-	/* Egress configuration (REW_TAG_CFG): VLAN tag type to 8021Q. */
-	val = REW_TAG_CFG_TAG_TPID_CFG(0);
+		       ANA_PORT_DROP_CFG_DROP_PRIO_C_TAGGED_ENA,
+		       ANA_PORT_DROP_CFG, port);
 
-	if (port->vlan_aware) {
-		if (port->vid)
+	if (vlan_aware) {
+		if (ocelot_port->vid)
 			/* Tag all frames except when VID == DEFAULT_VLAN */
 			val |= REW_TAG_CFG_TAG_CFG(1);
 		else
 			/* Tag all frames */
 			val |= REW_TAG_CFG_TAG_CFG(3);
+	} else {
+		/* Port tagging disabled. */
+		val = REW_TAG_CFG_TAG_CFG(0);
 	}
 	ocelot_rmw_gix(ocelot, val,
-		       REW_TAG_CFG_TAG_TPID_CFG_M |
 		       REW_TAG_CFG_TAG_CFG_M,
-		       REW_TAG_CFG, port->chip_port);
+		       REW_TAG_CFG, port);
 
-	/* Set default VLAN and tag type to 8021Q. */
-	val = REW_PORT_VLAN_CFG_PORT_TPID(ETH_P_8021Q) |
-	      REW_PORT_VLAN_CFG_PORT_VID(port->vid);
-	ocelot_rmw_gix(ocelot, val,
-		       REW_PORT_VLAN_CFG_PORT_TPID_M |
+	ocelot_port->vlan_aware = vlan_aware;
+}
+
+static int ocelot_port_set_native_vlan(struct ocelot *ocelot, int port,
+				       u16 vid)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+
+	if (ocelot_port->vid != vid) {
+		/* Always permit deleting the native VLAN (vid = 0) */
+		if (ocelot_port->vid && vid) {
+			dev_err(ocelot->dev,
+				"Port already has a native VLAN: %d\n",
+				ocelot_port->vid);
+			return -EBUSY;
+		}
+		ocelot_port->vid = vid;
+	}
+
+	ocelot_rmw_gix(ocelot, REW_PORT_VLAN_CFG_PORT_VID(vid),
 		       REW_PORT_VLAN_CFG_PORT_VID_M,
-		       REW_PORT_VLAN_CFG, port->chip_port);
+		       REW_PORT_VLAN_CFG, port);
+
+	return 0;
+}
+
+/* Default vlan to clasify for untagged frames (may be zero) */
+static void ocelot_port_set_pvid(struct ocelot *ocelot, int port, u16 pvid)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+
+	ocelot_rmw_gix(ocelot,
+		       ANA_PORT_VLAN_CFG_VLAN_VID(pvid),
+		       ANA_PORT_VLAN_CFG_VLAN_VID_M,
+		       ANA_PORT_VLAN_CFG, port);
+
+	ocelot_port->pvid = pvid;
 }
 
 static int ocelot_vlan_vid_add(struct net_device *dev, u16 vid, bool pvid,
 			       bool untagged)
 {
-	struct ocelot_port *port = netdev_priv(dev);
-	struct ocelot *ocelot = port->ocelot;
+	struct ocelot_port *ocelot_port = netdev_priv(dev);
+	struct ocelot *ocelot = ocelot_port->ocelot;
+	int port = ocelot_port->chip_port;
 	int ret;
 
 	/* Add the port MAC address to with the right VLAN information */
@@ -251,35 +283,30 @@ static int ocelot_vlan_vid_add(struct net_device *dev, u16 vid, bool pvid,
 			  ENTRYTYPE_LOCKED);
 
 	/* Make the port a member of the VLAN */
-	ocelot->vlan_mask[vid] |= BIT(port->chip_port);
+	ocelot->vlan_mask[vid] |= BIT(port);
 	ret = ocelot_vlant_set_mask(ocelot, vid, ocelot->vlan_mask[vid]);
 	if (ret)
 		return ret;
 
 	/* Default ingress vlan classification */
 	if (pvid)
-		port->pvid = vid;
+		ocelot_port_set_pvid(ocelot, port, vid);
 
 	/* Untagged egress vlan clasification */
-	if (untagged && port->vid != vid) {
-		if (port->vid) {
-			dev_err(ocelot->dev,
-				"Port already has a native VLAN: %d\n",
-				port->vid);
-			return -EBUSY;
-		}
-		port->vid = vid;
+	if (untagged) {
+		ret = ocelot_port_set_native_vlan(ocelot, port, vid);
+		if (ret)
+			return ret;
 	}
 
-	ocelot_vlan_port_apply(ocelot, port);
-
 	return 0;
 }
 
 static int ocelot_vlan_vid_del(struct net_device *dev, u16 vid)
 {
-	struct ocelot_port *port = netdev_priv(dev);
-	struct ocelot *ocelot = port->ocelot;
+	struct ocelot_port *ocelot_port = netdev_priv(dev);
+	struct ocelot *ocelot = ocelot_port->ocelot;
+	int port = ocelot_port->chip_port;
 	int ret;
 
 	/* 8021q removes VID 0 on module unload for all interfaces
@@ -293,20 +320,18 @@ static int ocelot_vlan_vid_del(struct net_device *dev, u16 vid)
 	ocelot_mact_forget(ocelot, dev->dev_addr, vid);
 
 	/* Stop the port from being a member of the vlan */
-	ocelot->vlan_mask[vid] &= ~BIT(port->chip_port);
+	ocelot->vlan_mask[vid] &= ~BIT(port);
 	ret = ocelot_vlant_set_mask(ocelot, vid, ocelot->vlan_mask[vid]);
 	if (ret)
 		return ret;
 
 	/* Ingress */
-	if (port->pvid == vid)
-		port->pvid = 0;
+	if (ocelot_port->pvid == vid)
+		ocelot_port_set_pvid(ocelot, port, 0);
 
 	/* Egress */
-	if (port->vid == vid)
-		port->vid = 0;
-
-	ocelot_vlan_port_apply(ocelot, port);
+	if (ocelot_port->vid == vid)
+		ocelot_port_set_native_vlan(ocelot, port, 0);
 
 	return 0;
 }
@@ -1306,6 +1331,7 @@ static int ocelot_port_attr_set(struct net_device *dev,
 				struct switchdev_trans *trans)
 {
 	struct ocelot_port *ocelot_port = netdev_priv(dev);
+	struct ocelot *ocelot = ocelot_port->ocelot;
 	int err = 0;
 
 	switch (attr->id) {
@@ -1317,8 +1343,8 @@ static int ocelot_port_attr_set(struct net_device *dev,
 		ocelot_port_attr_ageing_set(ocelot_port, attr->u.ageing_time);
 		break;
 	case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
-		ocelot_port->vlan_aware = attr->u.vlan_filtering;
-		ocelot_vlan_port_apply(ocelot_port->ocelot, ocelot_port);
+		ocelot_port_vlan_filtering(ocelot, ocelot_port->chip_port,
+					   attr->u.vlan_filtering);
 		break;
 	case SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED:
 		ocelot_port_attr_mc_set(ocelot_port, !attr->u.mc_disabled);
@@ -1520,20 +1546,20 @@ static int ocelot_port_bridge_join(struct ocelot_port *ocelot_port,
 	return 0;
 }
 
-static void ocelot_port_bridge_leave(struct ocelot_port *ocelot_port,
-				     struct net_device *bridge)
+static int ocelot_port_bridge_leave(struct ocelot_port *ocelot_port,
+				    struct net_device *bridge)
 {
 	struct ocelot *ocelot = ocelot_port->ocelot;
+	int port = ocelot_port->chip_port;
 
-	ocelot->bridge_mask &= ~BIT(ocelot_port->chip_port);
+	ocelot->bridge_mask &= ~BIT(port);
 
 	if (!ocelot->bridge_mask)
 		ocelot->hw_bridge_dev = NULL;
 
-	/* Clear bridge vlan settings before calling ocelot_vlan_port_apply */
-	ocelot_port->vlan_aware = 0;
-	ocelot_port->pvid = 0;
-	ocelot_port->vid = 0;
+	ocelot_port_vlan_filtering(ocelot, port, 0);
+	ocelot_port_set_pvid(ocelot, port, 0);
+	return ocelot_port_set_native_vlan(ocelot, port, 0);
 }
 
 static void ocelot_set_aggr_pgids(struct ocelot *ocelot)
@@ -1687,11 +1713,8 @@ static int ocelot_netdevice_port_event(struct net_device *dev,
 				err = ocelot_port_bridge_join(ocelot_port,
 							      info->upper_dev);
 			else
-				ocelot_port_bridge_leave(ocelot_port,
-							 info->upper_dev);
-
-			ocelot_vlan_port_apply(ocelot_port->ocelot,
-					       ocelot_port);
+				err = ocelot_port_bridge_leave(ocelot_port,
+							       info->upper_dev);
 		}
 		if (netif_is_lag_master(info->upper_dev)) {
 			if (info->linking)
@@ -2007,6 +2030,7 @@ int ocelot_probe_port(struct ocelot *ocelot, u8 port,
 {
 	struct ocelot_port *ocelot_port;
 	struct net_device *dev;
+	u32 val;
 	int err;
 
 	dev = alloc_etherdev(sizeof(struct ocelot_port));
@@ -2042,7 +2066,15 @@ int ocelot_probe_port(struct ocelot *ocelot, u8 port,
 	}
 
 	/* Basic L2 initialization */
-	ocelot_vlan_port_apply(ocelot, ocelot_port);
+
+	/* Drop frames with multicast source address */
+	val = ANA_PORT_DROP_CFG_DROP_MC_SMAC_ENA;
+	ocelot_rmw_gix(ocelot, val, val, ANA_PORT_DROP_CFG, port);
+
+	/* Set default VLAN and tag type to 8021Q. */
+	ocelot_rmw_gix(ocelot, REW_PORT_VLAN_CFG_PORT_TPID(ETH_P_8021Q),
+		       REW_PORT_VLAN_CFG_PORT_TPID_M,
+		       REW_PORT_VLAN_CFG, port);
 
 	/* Enable vcap lookups */
 	ocelot_vcap_enable(ocelot, ocelot_port);
-- 
2.17.1

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