1 files changed, 300 insertions, 241 deletions

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index c00ee464afc7..9ef2caa13f27 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * net/dsa/dsa2.c - Hardware switch handling, binding version 2
  * Copyright (c) 2008-2009 Marvell Semiconductor
  * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
  * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <linux/device.h>
@@ -18,6 +14,7 @@
 #include <linux/rtnetlink.h>
 #include <linux/of.h>
 #include <linux/of_net.h>
+#include <net/devlink.h>
 
 #include "dsa_priv.h"
 
@@ -48,8 +45,12 @@ static struct dsa_switch_tree *dsa_tree_alloc(int index)
 
 	dst->index = index;
 
+	INIT_LIST_HEAD(&dst->rtable);
+
+	INIT_LIST_HEAD(&dst->ports);
+
 	INIT_LIST_HEAD(&dst->list);
-	list_add_tail(&dsa_tree_list, &dst->list);
+	list_add_tail(&dst->list, &dsa_tree_list);
 
 	kref_init(&dst->refcount);
 
@@ -114,24 +115,38 @@ static bool dsa_port_is_user(struct dsa_port *dp)
 static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
 						   struct device_node *dn)
 {
-	struct dsa_switch *ds;
 	struct dsa_port *dp;
-	int device, port;
 
-	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
-		ds = dst->ds[device];
-		if (!ds)
-			continue;
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dp->dn == dn)
+			return dp;
 
-		for (port = 0; port < ds->num_ports; port++) {
-			dp = &ds->ports[port];
+	return NULL;
+}
 
-			if (dp->dn == dn)
-				return dp;
-		}
-	}
+struct dsa_link *dsa_link_touch(struct dsa_port *dp, struct dsa_port *link_dp)
+{
+	struct dsa_switch *ds = dp->ds;
+	struct dsa_switch_tree *dst;
+	struct dsa_link *dl;
 
-	return NULL;
+	dst = ds->dst;
+
+	list_for_each_entry(dl, &dst->rtable, list)
+		if (dl->dp == dp && dl->link_dp == link_dp)
+			return dl;
+
+	dl = kzalloc(sizeof(*dl), GFP_KERNEL);
+	if (!dl)
+		return NULL;
+
+	dl->dp = dp;
+	dl->link_dp = link_dp;
+
+	INIT_LIST_HEAD(&dl->list);
+	list_add_tail(&dl->list, &dst->rtable);
+
+	return dl;
 }
 
 static bool dsa_port_setup_routing_table(struct dsa_port *dp)
@@ -141,6 +156,7 @@ static bool dsa_port_setup_routing_table(struct dsa_port *dp)
 	struct device_node *dn = dp->dn;
 	struct of_phandle_iterator it;
 	struct dsa_port *link_dp;
+	struct dsa_link *dl;
 	int err;
 
 	of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
@@ -150,24 +166,22 @@ static bool dsa_port_setup_routing_table(struct dsa_port *dp)
 			return false;
 		}
 
-		ds->rtable[link_dp->ds->index] = dp->index;
+		dl = dsa_link_touch(dp, link_dp);
+		if (!dl) {
+			of_node_put(it.node);
+			return false;
+		}
 	}
 
 	return true;
 }
 
-static bool dsa_switch_setup_routing_table(struct dsa_switch *ds)
+static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
 {
 	bool complete = true;
 	struct dsa_port *dp;
-	int i;
-
-	for (i = 0; i < DSA_MAX_SWITCHES; i++)
-		ds->rtable[i] = DSA_RTABLE_NONE;
-
-	for (i = 0; i < ds->num_ports; i++) {
-		dp = &ds->ports[i];
 
+	list_for_each_entry(dp, &dst->ports, list) {
 		if (dsa_port_is_dsa(dp)) {
 			complete = dsa_port_setup_routing_table(dp);
 			if (!complete)
@@ -178,170 +192,177 @@ static bool dsa_switch_setup_routing_table(struct dsa_switch *ds)
 	return complete;
 }
 
-static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
-{
-	struct dsa_switch *ds;
-	bool complete = true;
-	int device;
-
-	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
-		ds = dst->ds[device];
-		if (!ds)
-			continue;
-
-		complete = dsa_switch_setup_routing_table(ds);
-		if (!complete)
-			break;
-	}
-
-	return complete;
-}
-
 static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
 {
-	struct dsa_switch *ds;
 	struct dsa_port *dp;
-	int device, port;
-
-	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
-		ds = dst->ds[device];
-		if (!ds)
-			continue;
 
-		for (port = 0; port < ds->num_ports; port++) {
-			dp = &ds->ports[port];
-
-			if (dsa_port_is_cpu(dp))
-				return dp;
-		}
-	}
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dsa_port_is_cpu(dp))
+			return dp;
 
 	return NULL;
 }
 
 static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
 {
-	struct dsa_switch *ds;
-	struct dsa_port *dp;
-	int device, port;
+	struct dsa_port *cpu_dp, *dp;
 
-	/* DSA currently only supports a single CPU port */
-	dst->cpu_dp = dsa_tree_find_first_cpu(dst);
-	if (!dst->cpu_dp) {
-		pr_warn("Tree has no master device\n");
+	cpu_dp = dsa_tree_find_first_cpu(dst);
+	if (!cpu_dp) {
+		pr_err("DSA: tree %d has no CPU port\n", dst->index);
 		return -EINVAL;
 	}
 
 	/* Assign the default CPU port to all ports of the fabric */
-	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
-		ds = dst->ds[device];
-		if (!ds)
-			continue;
-
-		for (port = 0; port < ds->num_ports; port++) {
-			dp = &ds->ports[port];
-
-			if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
-				dp->cpu_dp = dst->cpu_dp;
-		}
-	}
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
+			dp->cpu_dp = cpu_dp;
 
 	return 0;
 }
 
 static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
 {
-	/* DSA currently only supports a single CPU port */
-	dst->cpu_dp = NULL;
+	struct dsa_port *dp;
+
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
+			dp->cpu_dp = NULL;
 }
 
 static int dsa_port_setup(struct dsa_port *dp)
 {
 	struct dsa_switch *ds = dp->ds;
+	struct dsa_switch_tree *dst = ds->dst;
+	const unsigned char *id = (const unsigned char *)&dst->index;
+	const unsigned char len = sizeof(dst->index);
+	struct devlink_port *dlp = &dp->devlink_port;
+	bool dsa_port_link_registered = false;
+	bool devlink_port_registered = false;
+	struct devlink *dl = ds->devlink;
+	bool dsa_port_enabled = false;
 	int err = 0;
 
-	memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));
-
-	if (dp->type != DSA_PORT_TYPE_UNUSED)
-		err = devlink_port_register(ds->devlink, &dp->devlink_port,
-					    dp->index);
-	if (err)
-		return err;
+	if (dp->setup)
+		return 0;
 
 	switch (dp->type) {
 	case DSA_PORT_TYPE_UNUSED:
+		dsa_port_disable(dp);
 		break;
 	case DSA_PORT_TYPE_CPU:
-		/* dp->index is used now as port_number. However
-		 * CPU ports should have separate numbering
-		 * independent from front panel port numbers.
-		 */
-		devlink_port_attrs_set(&dp->devlink_port,
-				       DEVLINK_PORT_FLAVOUR_CPU,
-				       dp->index, false, 0);
+		memset(dlp, 0, sizeof(*dlp));
+		devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_CPU,
+				       dp->index, false, 0, id, len);
+		err = devlink_port_register(dl, dlp, dp->index);
+		if (err)
+			break;
+		devlink_port_registered = true;
+
 		err = dsa_port_link_register_of(dp);
-		if (err) {
-			dev_err(ds->dev, "failed to setup link for port %d.%d\n",
-				ds->index, dp->index);
-			return err;
-		}
+		if (err)
+			break;
+		dsa_port_link_registered = true;
+
+		err = dsa_port_enable(dp, NULL);
+		if (err)
+			break;
+		dsa_port_enabled = true;
+
 		break;
 	case DSA_PORT_TYPE_DSA:
-		/* dp->index is used now as port_number. However
-		 * DSA ports should have separate numbering
-		 * independent from front panel port numbers.
-		 */
-		devlink_port_attrs_set(&dp->devlink_port,
-				       DEVLINK_PORT_FLAVOUR_DSA,
-				       dp->index, false, 0);
+		memset(dlp, 0, sizeof(*dlp));
+		devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_DSA,
+				       dp->index, false, 0, id, len);
+		err = devlink_port_register(dl, dlp, dp->index);
+		if (err)
+			break;
+		devlink_port_registered = true;
+
 		err = dsa_port_link_register_of(dp);
-		if (err) {
-			dev_err(ds->dev, "failed to setup link for port %d.%d\n",
-				ds->index, dp->index);
-			return err;
-		}
+		if (err)
+			break;
+		dsa_port_link_registered = true;
+
+		err = dsa_port_enable(dp, NULL);
+		if (err)
+			break;
+		dsa_port_enabled = true;
+
 		break;
 	case DSA_PORT_TYPE_USER:
-		devlink_port_attrs_set(&dp->devlink_port,
-				       DEVLINK_PORT_FLAVOUR_PHYSICAL,
-				       dp->index, false, 0);
+		memset(dlp, 0, sizeof(*dlp));
+		devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_PHYSICAL,
+				       dp->index, false, 0, id, len);
+		err = devlink_port_register(dl, dlp, dp->index);
+		if (err)
+			break;
+		devlink_port_registered = true;
+
+		dp->mac = of_get_mac_address(dp->dn);
 		err = dsa_slave_create(dp);
 		if (err)
-			dev_err(ds->dev, "failed to create slave for port %d.%d\n",
-				ds->index, dp->index);
-		else
-			devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
+			break;
+
+		devlink_port_type_eth_set(dlp, dp->slave);
 		break;
 	}
 
+	if (err && dsa_port_enabled)
+		dsa_port_disable(dp);
+	if (err && dsa_port_link_registered)
+		dsa_port_link_unregister_of(dp);
+	if (err && devlink_port_registered)
+		devlink_port_unregister(dlp);
+	if (err)
+		return err;
+
+	dp->setup = true;
+
 	return 0;
 }
 
 static void dsa_port_teardown(struct dsa_port *dp)
 {
-	if (dp->type != DSA_PORT_TYPE_UNUSED)
-		devlink_port_unregister(&dp->devlink_port);
+	struct devlink_port *dlp = &dp->devlink_port;
+
+	if (!dp->setup)
+		return;
 
 	switch (dp->type) {
 	case DSA_PORT_TYPE_UNUSED:
 		break;
 	case DSA_PORT_TYPE_CPU:
+		dsa_port_disable(dp);
+		dsa_tag_driver_put(dp->tag_ops);
+		devlink_port_unregister(dlp);
+		dsa_port_link_unregister_of(dp);
+		break;
 	case DSA_PORT_TYPE_DSA:
+		dsa_port_disable(dp);
+		devlink_port_unregister(dlp);
 		dsa_port_link_unregister_of(dp);
 		break;
 	case DSA_PORT_TYPE_USER:
+		devlink_port_unregister(dlp);
 		if (dp->slave) {
 			dsa_slave_destroy(dp->slave);
 			dp->slave = NULL;
 		}
 		break;
 	}
+
+	dp->setup = false;
 }
 
 static int dsa_switch_setup(struct dsa_switch *ds)
 {
+	struct dsa_devlink_priv *dl_priv;
 	int err;
 
+	if (ds->setup)
+		return 0;
+
 	/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
 	 * driver and before ops->setup() has run, since the switch drivers and
 	 * the slave MDIO bus driver rely on these values for probing PHY
@@ -352,116 +373,140 @@ static int dsa_switch_setup(struct dsa_switch *ds)
 	/* Add the switch to devlink before calling setup, so that setup can
 	 * add dpipe tables
 	 */
-	ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
+	ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv));
 	if (!ds->devlink)
 		return -ENOMEM;
+	dl_priv = devlink_priv(ds->devlink);
+	dl_priv->ds = ds;
 
 	err = devlink_register(ds->devlink, ds->dev);
 	if (err)
-		return err;
+		goto free_devlink;
+
+	err = dsa_switch_register_notifier(ds);
+	if (err)
+		goto unregister_devlink;
 
 	err = ds->ops->setup(ds);
 	if (err < 0)
-		return err;
+		goto unregister_notifier;
 
-	err = dsa_switch_register_notifier(ds);
-	if (err)
-		return err;
+	devlink_params_publish(ds->devlink);
 
 	if (!ds->slave_mii_bus && ds->ops->phy_read) {
 		ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
-		if (!ds->slave_mii_bus)
-			return -ENOMEM;
+		if (!ds->slave_mii_bus) {
+			err = -ENOMEM;
+			goto unregister_notifier;
+		}
 
 		dsa_slave_mii_bus_init(ds);
 
 		err = mdiobus_register(ds->slave_mii_bus);
 		if (err < 0)
-			return err;
+			goto unregister_notifier;
 	}
 
+	ds->setup = true;
+
 	return 0;
+
+unregister_notifier:
+	dsa_switch_unregister_notifier(ds);
+unregister_devlink:
+	devlink_unregister(ds->devlink);
+free_devlink:
+	devlink_free(ds->devlink);
+	ds->devlink = NULL;
+
+	return err;
 }
 
 static void dsa_switch_teardown(struct dsa_switch *ds)
 {
+	if (!ds->setup)
+		return;
+
 	if (ds->slave_mii_bus && ds->ops->phy_read)
 		mdiobus_unregister(ds->slave_mii_bus);
 
 	dsa_switch_unregister_notifier(ds);
 
+	if (ds->ops->teardown)
+		ds->ops->teardown(ds);
+
 	if (ds->devlink) {
 		devlink_unregister(ds->devlink);
 		devlink_free(ds->devlink);
 		ds->devlink = NULL;
 	}
 
+	ds->setup = false;
 }
 
 static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
 {
-	struct dsa_switch *ds;
 	struct dsa_port *dp;
-	int device, port;
 	int err;
 
-	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
-		ds = dst->ds[device];
-		if (!ds)
-			continue;
-
-		err = dsa_switch_setup(ds);
+	list_for_each_entry(dp, &dst->ports, list) {
+		err = dsa_switch_setup(dp->ds);
 		if (err)
-			return err;
-
-		for (port = 0; port < ds->num_ports; port++) {
-			dp = &ds->ports[port];
+			goto teardown;
+	}
 
-			err = dsa_port_setup(dp);
-			if (err)
-				return err;
-		}
+	list_for_each_entry(dp, &dst->ports, list) {
+		err = dsa_port_setup(dp);
+		if (err)
+			goto teardown;
 	}
 
 	return 0;
+
+teardown:
+	list_for_each_entry(dp, &dst->ports, list)
+		dsa_port_teardown(dp);
+
+	list_for_each_entry(dp, &dst->ports, list)
+		dsa_switch_teardown(dp->ds);
+
+	return err;
 }
 
 static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
 {
-	struct dsa_switch *ds;
 	struct dsa_port *dp;
-	int device, port;
-
-	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
-		ds = dst->ds[device];
-		if (!ds)
-			continue;
 
-		for (port = 0; port < ds->num_ports; port++) {
-			dp = &ds->ports[port];
+	list_for_each_entry(dp, &dst->ports, list)
+		dsa_port_teardown(dp);
 
-			dsa_port_teardown(dp);
-		}
-
-		dsa_switch_teardown(ds);
-	}
+	list_for_each_entry(dp, &dst->ports, list)
+		dsa_switch_teardown(dp->ds);
 }
 
 static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
 {
-	struct dsa_port *cpu_dp = dst->cpu_dp;
-	struct net_device *master = cpu_dp->master;
+	struct dsa_port *dp;
+	int err;
 
-	/* DSA currently supports a single pair of CPU port and master device */
-	return dsa_master_setup(master, cpu_dp);
+	list_for_each_entry(dp, &dst->ports, list) {
+		if (dsa_port_is_cpu(dp)) {
+			err = dsa_master_setup(dp->master, dp);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
 }
 
 static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
 {
-	struct dsa_port *cpu_dp = dst->cpu_dp;
-	struct net_device *master = cpu_dp->master;
+	struct dsa_port *dp;
 
-	return dsa_master_teardown(master);
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dsa_port_is_cpu(dp))
+			dsa_master_teardown(dp->master);
 }
 
 static int dsa_tree_setup(struct dsa_switch_tree *dst)
@@ -485,21 +530,30 @@ static int dsa_tree_setup(struct dsa_switch_tree *dst)
 
 	err = dsa_tree_setup_switches(dst);
 	if (err)
-		return err;
+		goto teardown_default_cpu;
 
 	err = dsa_tree_setup_master(dst);
 	if (err)
-		return err;
+		goto teardown_switches;
 
 	dst->setup = true;
 
 	pr_info("DSA: tree %d setup\n", dst->index);
 
 	return 0;
+
+teardown_switches:
+	dsa_tree_teardown_switches(dst);
+teardown_default_cpu:
+	dsa_tree_teardown_default_cpu(dst);
+
+	return err;
 }
 
 static void dsa_tree_teardown(struct dsa_switch_tree *dst)
 {
+	struct dsa_link *dl, *next;
+
 	if (!dst->setup)
 		return;
 
@@ -509,37 +563,36 @@ static void dsa_tree_teardown(struct dsa_switch_tree *dst)
 
 	dsa_tree_teardown_default_cpu(dst);
 
+	list_for_each_entry_safe(dl, next, &dst->rtable, list) {
+		list_del(&dl->list);
+		kfree(dl);
+	}
+
 	pr_info("DSA: tree %d torn down\n", dst->index);
 
 	dst->setup = false;
 }
 
-static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
-				   unsigned int index)
+static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
 {
-	dsa_tree_teardown(dst);
+	struct dsa_switch_tree *dst = ds->dst;
+	struct dsa_port *dp;
 
-	dst->ds[index] = NULL;
-	dsa_tree_put(dst);
-}
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dp->ds == ds && dp->index == index)
+			return dp;
 
-static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
-			       struct dsa_switch *ds)
-{
-	unsigned int index = ds->index;
-	int err;
+	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+	if (!dp)
+		return NULL;
 
-	if (dst->ds[index])
-		return -EBUSY;
+	dp->ds = ds;
+	dp->index = index;
 
-	dsa_tree_get(dst);
-	dst->ds[index] = ds;
+	INIT_LIST_HEAD(&dp->list);
+	list_add_tail(&dp->list, &dst->ports);
 
-	err = dsa_tree_setup(dst);
-	if (err)
-		dsa_tree_remove_switch(dst, index);
-
-	return err;
+	return dp;
 }
 
 static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
@@ -568,13 +621,16 @@ static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
 	enum dsa_tag_protocol tag_protocol;
 
 	tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
-	tag_ops = dsa_resolve_tag_protocol(tag_protocol);
+	tag_ops = dsa_tag_driver_get(tag_protocol);
 	if (IS_ERR(tag_ops)) {
+		if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
+			return -EPROBE_DEFER;
 		dev_warn(ds->dev, "No tagger for this switch\n");
 		return PTR_ERR(tag_ops);
 	}
 
 	dp->type = DSA_PORT_TYPE_CPU;
+	dp->filter = tag_ops->filter;
 	dp->rcv = tag_ops->rcv;
 	dp->tag_ops = tag_ops;
 	dp->master = master;
@@ -631,7 +687,7 @@ static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
 			goto out_put_node;
 		}
 
-		dp = &ds->ports[reg];
+		dp = dsa_to_port(ds, reg);
 
 		err = dsa_port_parse_of(dp, port);
 		if (err)
@@ -655,8 +711,6 @@ static int dsa_switch_parse_member_of(struct dsa_switch *ds,
 		return sz;
 
 	ds->index = m[1];
-	if (ds->index >= DSA_MAX_SWITCHES)
-		return -EINVAL;
 
 	ds->dst = dsa_tree_touch(m[0]);
 	if (!ds->dst)
@@ -665,6 +719,20 @@ static int dsa_switch_parse_member_of(struct dsa_switch *ds,
 	return 0;
 }
 
+static int dsa_switch_touch_ports(struct dsa_switch *ds)
+{
+	struct dsa_port *dp;
+	int port;
+
+	for (port = 0; port < ds->num_ports; port++) {
+		dp = dsa_port_touch(ds, port);
+		if (!dp)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
 static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
 {
 	int err;
@@ -673,6 +741,10 @@ static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
 	if (err)
 		return err;
 
+	err = dsa_switch_touch_ports(ds);
+	if (err)
+		return err;
+
 	return dsa_switch_parse_ports_of(ds, dn);
 }
 
@@ -710,7 +782,7 @@ static int dsa_switch_parse_ports(struct dsa_switch *ds,
 	for (i = 0; i < DSA_MAX_PORTS; i++) {
 		name = cd->port_names[i];
 		dev = cd->netdev[i];
-		dp = &ds->ports[i];
+		dp = dsa_to_port(ds, i);
 
 		if (!name)
 			continue;
@@ -730,6 +802,8 @@ static int dsa_switch_parse_ports(struct dsa_switch *ds,
 
 static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
 {
+	int err;
+
 	ds->cd = cd;
 
 	/* We don't support interconnected switches nor multiple trees via
@@ -740,22 +814,29 @@ static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
 	if (!ds->dst)
 		return -ENOMEM;
 
-	return dsa_switch_parse_ports(ds, cd);
-}
-
-static int dsa_switch_add(struct dsa_switch *ds)
-{
-	struct dsa_switch_tree *dst = ds->dst;
+	err = dsa_switch_touch_ports(ds);
+	if (err)
+		return err;
 
-	return dsa_tree_add_switch(dst, ds);
+	return dsa_switch_parse_ports(ds, cd);
 }
 
 static int dsa_switch_probe(struct dsa_switch *ds)
 {
-	struct dsa_chip_data *pdata = ds->dev->platform_data;
-	struct device_node *np = ds->dev->of_node;
+	struct dsa_switch_tree *dst;
+	struct dsa_chip_data *pdata;
+	struct device_node *np;
 	int err;
 
+	if (!ds->dev)
+		return -ENODEV;
+
+	pdata = ds->dev->platform_data;
+	np = ds->dev->of_node;
+
+	if (!ds->num_ports)
+		return -EINVAL;
+
 	if (np)
 		err = dsa_switch_parse_of(ds, np);
 	else if (pdata)
@@ -766,43 +847,14 @@ static int dsa_switch_probe(struct dsa_switch *ds)
 	if (err)
 		return err;
 
-	return dsa_switch_add(ds);
-}
-
-struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
-{
-	struct dsa_switch *ds;
-	int i;
-
-	ds = devm_kzalloc(dev, struct_size(ds, ports, n), GFP_KERNEL);
-	if (!ds)
-		return NULL;
-
-	/* We avoid allocating memory outside dsa_switch
-	 * if it is not needed.
-	 */
-	if (n <= sizeof(ds->_bitmap) * 8) {
-		ds->bitmap = &ds->_bitmap;
-	} else {
-		ds->bitmap = devm_kcalloc(dev,
-					  BITS_TO_LONGS(n),
-					  sizeof(unsigned long),
-					  GFP_KERNEL);
-		if (unlikely(!ds->bitmap))
-			return NULL;
-	}
-
-	ds->dev = dev;
-	ds->num_ports = n;
-
-	for (i = 0; i < ds->num_ports; ++i) {
-		ds->ports[i].index = i;
-		ds->ports[i].ds = ds;
-	}
+	dst = ds->dst;
+	dsa_tree_get(dst);
+	err = dsa_tree_setup(dst);
+	if (err)
+		dsa_tree_put(dst);
 
-	return ds;
+	return err;
 }
-EXPORT_SYMBOL_GPL(dsa_switch_alloc);
 
 int dsa_register_switch(struct dsa_switch *ds)
 {
@@ -820,9 +872,16 @@ EXPORT_SYMBOL_GPL(dsa_register_switch);
 static void dsa_switch_remove(struct dsa_switch *ds)
 {
 	struct dsa_switch_tree *dst = ds->dst;
-	unsigned int index = ds->index;
+	struct dsa_port *dp, *next;
+
+	dsa_tree_teardown(dst);
 
-	dsa_tree_remove_switch(dst, index);
+	list_for_each_entry_safe(dp, next, &dst->ports, list) {
+		list_del(&dp->list);
+		kfree(dp);
+	}
+
+	dsa_tree_put(dst);
 }
 
 void dsa_unregister_switch(struct dsa_switch *ds)