[mirror_ubuntu-bionic-kernel.git] / net / dsa / dsa2.c

/*
 * 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>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/of.h>
#include <linux/of_net.h>

#include "dsa_priv.h"

static LIST_HEAD(dsa_tree_list);
static DEFINE_MUTEX(dsa2_mutex);

static const struct devlink_ops dsa_devlink_ops = {
};

static struct dsa_switch_tree *dsa_tree_find(int index)
{
	struct dsa_switch_tree *dst;

	list_for_each_entry(dst, &dsa_tree_list, list)
		if (dst->index == index)
			return dst;

	return NULL;
}

static struct dsa_switch_tree *dsa_tree_alloc(int index)
{
	struct dsa_switch_tree *dst;

	dst = kzalloc(sizeof(*dst), GFP_KERNEL);
	if (!dst)
		return NULL;

	dst->index = index;

	INIT_LIST_HEAD(&dst->list);
	list_add_tail(&dsa_tree_list, &dst->list);

	kref_init(&dst->refcount);

	return dst;
}

static void dsa_tree_free(struct dsa_switch_tree *dst)
{
	list_del(&dst->list);
	kfree(dst);
}

static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
{
	if (dst)
		kref_get(&dst->refcount);

	return dst;
}

static struct dsa_switch_tree *dsa_tree_touch(int index)
{
	struct dsa_switch_tree *dst;

	dst = dsa_tree_find(index);
	if (dst)
		return dsa_tree_get(dst);
	else
		return dsa_tree_alloc(index);
}

static void dsa_tree_release(struct kref *ref)
{
	struct dsa_switch_tree *dst;

	dst = container_of(ref, struct dsa_switch_tree, refcount);

	dsa_tree_free(dst);
}

static void dsa_tree_put(struct dsa_switch_tree *dst)
{
	if (dst)
		kref_put(&dst->refcount, dsa_tree_release);
}

static bool dsa_port_is_dsa(struct dsa_port *port)
{
	return port->type == DSA_PORT_TYPE_DSA;
}

static bool dsa_port_is_cpu(struct dsa_port *port)
{
	return port->type == DSA_PORT_TYPE_CPU;
}

static bool dsa_port_is_user(struct dsa_port *dp)
{
	return dp->type == DSA_PORT_TYPE_USER;
}

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;

		for (port = 0; port < ds->num_ports; port++) {
			dp = &ds->ports[port];

			if (dp->dn == dn)
				return dp;
		}
	}

	return NULL;
}

static bool dsa_port_setup_routing_table(struct dsa_port *dp)
{
	struct dsa_switch *ds = dp->ds;
	struct dsa_switch_tree *dst = ds->dst;
	struct device_node *dn = dp->dn;
	struct of_phandle_iterator it;
	struct dsa_port *link_dp;
	int err;

	of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
		link_dp = dsa_tree_find_port_by_node(dst, it.node);
		if (!link_dp) {
			of_node_put(it.node);
			return false;
		}

		ds->rtable[link_dp->ds->index] = dp->index;
	}

	return true;
}

static bool dsa_switch_setup_routing_table(struct dsa_switch *ds)
{
	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];

		if (dsa_port_is_dsa(dp)) {
			complete = dsa_port_setup_routing_table(dp);
			if (!complete)
				break;
		}
	}

	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;
		}
	}

	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;

	/* 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");
		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))
				dp->cpu_dp = dst->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;
}

static int dsa_port_setup(struct dsa_port *dp)
{
	struct dsa_switch *ds = dp->ds;
	int err;

	memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));

	err = devlink_port_register(ds->devlink, &dp->devlink_port, dp->index);
	if (err)
		return err;

	switch (dp->type) {
	case DSA_PORT_TYPE_UNUSED:
		break;
	case DSA_PORT_TYPE_CPU:
	case DSA_PORT_TYPE_DSA:
		err = dsa_port_fixed_link_register_of(dp);
		if (err) {
			dev_err(ds->dev, "failed to register fixed link for port %d.%d\n",
				ds->index, dp->index);
			return err;
		}

		break;
	case DSA_PORT_TYPE_USER:
		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;
	}

	return 0;
}

static void dsa_port_teardown(struct dsa_port *dp)
{
	devlink_port_unregister(&dp->devlink_port);

	switch (dp->type) {
	case DSA_PORT_TYPE_UNUSED:
		break;
	case DSA_PORT_TYPE_CPU:
	case DSA_PORT_TYPE_DSA:
		dsa_port_fixed_link_unregister_of(dp);
		break;
	case DSA_PORT_TYPE_USER:
		if (dp->slave) {
			dsa_slave_destroy(dp->slave);
			dp->slave = NULL;
		}
		break;
	}
}

static int dsa_switch_setup(struct dsa_switch *ds)
{
	int err;

	/* 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
	 * devices or not
	 */
	ds->phys_mii_mask |= dsa_user_ports(ds);

	/* Add the switch to devlink before calling setup, so that setup can
	 * add dpipe tables
	 */
	ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
	if (!ds->devlink)
		return -ENOMEM;

	err = devlink_register(ds->devlink, ds->dev);
	if (err)
		return err;

	err = ds->ops->setup(ds);
	if (err < 0)
		return err;

	err = dsa_switch_register_notifier(ds);
	if (err)
		return err;

	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;

		dsa_slave_mii_bus_init(ds);

		err = mdiobus_register(ds->slave_mii_bus);
		if (err < 0)
			return err;
	}

	return 0;
}

static void dsa_switch_teardown(struct dsa_switch *ds)
{
	if (ds->slave_mii_bus && ds->ops->phy_read)
		mdiobus_unregister(ds->slave_mii_bus);

	dsa_switch_unregister_notifier(ds);

	if (ds->devlink) {
		devlink_unregister(ds->devlink);
		devlink_free(ds->devlink);
		ds->devlink = NULL;
	}

}

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);
		if (err)
			return err;

		for (port = 0; port < ds->num_ports; port++) {
			dp = &ds->ports[port];

			err = dsa_port_setup(dp);
			if (err)
				return err;
		}
	}

	return 0;
}

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];

			dsa_port_teardown(dp);
		}

		dsa_switch_teardown(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;

	/* DSA currently supports a single pair of CPU port and master device */
	return dsa_master_setup(master, cpu_dp);
}

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;

	return dsa_master_teardown(master);
}

static int dsa_tree_setup(struct dsa_switch_tree *dst)
{
	bool complete;
	int err;

	if (dst->setup) {
		pr_err("DSA: tree %d already setup! Disjoint trees?\n",
		       dst->index);
		return -EEXIST;
	}

	complete = dsa_tree_setup_routing_table(dst);
	if (!complete)
		return 0;

	err = dsa_tree_setup_default_cpu(dst);
	if (err)
		return err;

	err = dsa_tree_setup_switches(dst);
	if (err)
		return err;

	err = dsa_tree_setup_master(dst);
	if (err)
		return err;

	dst->setup = true;

	pr_info("DSA: tree %d setup\n", dst->index);

	return 0;
}

static void dsa_tree_teardown(struct dsa_switch_tree *dst)
{
	if (!dst->setup)
		return;

	dsa_tree_teardown_master(dst);

	dsa_tree_teardown_switches(dst);

	dsa_tree_teardown_default_cpu(dst);

	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)
{
	dsa_tree_teardown(dst);

	dst->ds[index] = NULL;
	dsa_tree_put(dst);
}

static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
			       struct dsa_switch *ds)
{
	unsigned int index = ds->index;
	int err;

	if (dst->ds[index])
		return -EBUSY;

	dsa_tree_get(dst);
	dst->ds[index] = ds;

	err = dsa_tree_setup(dst);
	if (err)
		dsa_tree_remove_switch(dst, index);

	return err;
}

static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
{
	if (!name)
		name = "eth%d";

	dp->type = DSA_PORT_TYPE_USER;
	dp->name = name;

	return 0;
}

static int dsa_port_parse_dsa(struct dsa_port *dp)
{
	dp->type = DSA_PORT_TYPE_DSA;

	return 0;
}

static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
{
	struct dsa_switch *ds = dp->ds;
	struct dsa_switch_tree *dst = ds->dst;
	const struct dsa_device_ops *tag_ops;
	enum dsa_tag_protocol tag_protocol;

	tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
	tag_ops = dsa_resolve_tag_protocol(tag_protocol);
	if (IS_ERR(tag_ops)) {
		dev_warn(ds->dev, "No tagger for this switch\n");
		return PTR_ERR(tag_ops);
	}

	dp->type = DSA_PORT_TYPE_CPU;
	dp->rcv = tag_ops->rcv;
	dp->tag_ops = tag_ops;
	dp->master = master;
	dp->dst = dst;

	return 0;
}

static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
{
	struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
	const char *name = of_get_property(dn, "label", NULL);
	bool link = of_property_read_bool(dn, "link");

	dp->dn = dn;

	if (ethernet) {
		struct net_device *master;

		master = of_find_net_device_by_node(ethernet);
		if (!master)
			return -EPROBE_DEFER;

		return dsa_port_parse_cpu(dp, master);
	}

	if (link)
		return dsa_port_parse_dsa(dp);

	return dsa_port_parse_user(dp, name);
}

static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
				     struct device_node *dn)
{
	struct device_node *ports, *port;
	struct dsa_port *dp;
	u32 reg;
	int err;

	ports = of_get_child_by_name(dn, "ports");
	if (!ports) {
		dev_err(ds->dev, "no ports child node found\n");
		return -EINVAL;
	}

	for_each_available_child_of_node(ports, port) {
		err = of_property_read_u32(port, "reg", &reg);
		if (err)
			return err;

		if (reg >= ds->num_ports)
			return -EINVAL;

		dp = &ds->ports[reg];

		err = dsa_port_parse_of(dp, port);
		if (err)
			return err;
	}

	return 0;
}

static int dsa_switch_parse_member_of(struct dsa_switch *ds,
				      struct device_node *dn)
{
	u32 m[2] = { 0, 0 };
	int sz;

	/* Don't error out if this optional property isn't found */
	sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
	if (sz < 0 && sz != -EINVAL)
		return sz;

	ds->index = m[1];
	if (ds->index >= DSA_MAX_SWITCHES)
		return -EINVAL;

	ds->dst = dsa_tree_touch(m[0]);
	if (!ds->dst)
		return -ENOMEM;

	return 0;
}

static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
{
	int err;

	err = dsa_switch_parse_member_of(ds, dn);
	if (err)
		return err;

	return dsa_switch_parse_ports_of(ds, dn);
}

static int dsa_port_parse(struct dsa_port *dp, const char *name,
			  struct device *dev)
{
	if (!strcmp(name, "cpu")) {
		struct net_device *master;

		master = dsa_dev_to_net_device(dev);
		if (!master)
			return -EPROBE_DEFER;

		dev_put(master);

		return dsa_port_parse_cpu(dp, master);
	}

	if (!strcmp(name, "dsa"))
		return dsa_port_parse_dsa(dp);

	return dsa_port_parse_user(dp, name);
}

static int dsa_switch_parse_ports(struct dsa_switch *ds,
				  struct dsa_chip_data *cd)
{
	bool valid_name_found = false;
	struct dsa_port *dp;
	struct device *dev;
	const char *name;
	unsigned int i;
	int err;

	for (i = 0; i < DSA_MAX_PORTS; i++) {
		name = cd->port_names[i];
		dev = cd->netdev[i];
		dp = &ds->ports[i];

		if (!name)
			continue;

		err = dsa_port_parse(dp, name, dev);
		if (err)
			return err;

		valid_name_found = true;
	}

	if (!valid_name_found && i == DSA_MAX_PORTS)
		return -EINVAL;

	return 0;
}

static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
{
	ds->cd = cd;

	/* We don't support interconnected switches nor multiple trees via
	 * platform data, so this is the unique switch of the tree.
	 */
	ds->index = 0;
	ds->dst = dsa_tree_touch(0);
	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;

	return dsa_tree_add_switch(dst, ds);
}

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;
	int err;

	if (np)
		err = dsa_switch_parse_of(ds, np);
	else if (pdata)
		err = dsa_switch_parse(ds, pdata);
	else
		err = -ENODEV;

	if (err)
		return err;

	return dsa_switch_add(ds);
}

struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
{
	size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
	struct dsa_switch *ds;
	int i;

	ds = devm_kzalloc(dev, size, GFP_KERNEL);
	if (!ds)
		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;
	}

	return ds;
}
EXPORT_SYMBOL_GPL(dsa_switch_alloc);

int dsa_register_switch(struct dsa_switch *ds)
{
	int err;

	mutex_lock(&dsa2_mutex);
	err = dsa_switch_probe(ds);
	dsa_tree_put(ds->dst);
	mutex_unlock(&dsa2_mutex);

	return err;
}
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;

	dsa_tree_remove_switch(dst, index);
}

void dsa_unregister_switch(struct dsa_switch *ds)
{
	mutex_lock(&dsa2_mutex);
	dsa_switch_remove(ds);
	mutex_unlock(&dsa2_mutex);
}
EXPORT_SYMBOL_GPL(dsa_unregister_switch);
Commit	Line	Data
83c0afae AL	1	/*
	2	* net/dsa/dsa2.c - Hardware switch handling, binding version 2
	3	* Copyright (c) 2008-2009 Marvell Semiconductor
	4	* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
	5	* Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*/
	12
	13	#include <linux/device.h>
	14	#include <linux/err.h>
	15	#include <linux/list.h>
c6e970a0	16	#include <linux/netdevice.h>
83c0afae AL	17	#include <linux/slab.h>
83c0afae AL	18	#include <linux/rtnetlink.h>
83c0afae AL	19	#include <linux/of.h>
83c0afae AL	20	#include <linux/of_net.h>
ea5dd34b	21
83c0afae AL	22	#include "dsa_priv.h"
83c0afae AL	23
1ca28ec9	24	static LIST_HEAD(dsa_tree_list);
83c0afae AL	25	static DEFINE_MUTEX(dsa2_mutex);
83c0afae AL	26
96567d5d AL	27	static const struct devlink_ops dsa_devlink_ops = {
	28	};
	29
1ca28ec9	30	static struct dsa_switch_tree *dsa_tree_find(int index)
83c0afae AL	31	{
	32	struct dsa_switch_tree *dst;
	33
1ca28ec9	34	list_for_each_entry(dst, &dsa_tree_list, list)
8e5bf975	35	if (dst->index == index)
83c0afae	36	return dst;
8e5bf975	37
83c0afae AL	38	return NULL;
	39	}
	40
1ca28ec9	41	static struct dsa_switch_tree *dsa_tree_alloc(int index)
83c0afae AL	42	{
	43	struct dsa_switch_tree *dst;
	44
	45	dst = kzalloc(sizeof(*dst), GFP_KERNEL);
	46	if (!dst)
	47	return NULL;
1ca28ec9	48
49463b7f	49	dst->index = index;
1ca28ec9	50
83c0afae	51	INIT_LIST_HEAD(&dst->list);
1ca28ec9	52	list_add_tail(&dsa_tree_list, &dst->list);
8e5bf975	53
83c0afae AL	54	kref_init(&dst->refcount);
	55
	56	return dst;
	57	}
	58
65254108 VD	59	static void dsa_tree_free(struct dsa_switch_tree *dst)
	60	{
	61	list_del(&dst->list);
	62	kfree(dst);
	63	}
	64
9e741045	65	static struct dsa_switch_tree dsa_tree_get(struct dsa_switch_tree dst)
1ca28ec9	66	{
9e741045 VD	67	if (dst)
9e741045 VD	68	kref_get(&dst->refcount);
1ca28ec9 VD	69
	70	return dst;
	71	}
	72
9e741045	73	static struct dsa_switch_tree *dsa_tree_touch(int index)
65254108	74	{
9e741045 VD	75	struct dsa_switch_tree *dst;
	76
	77	dst = dsa_tree_find(index);
	78	if (dst)
	79	return dsa_tree_get(dst);
	80	else
	81	return dsa_tree_alloc(index);
65254108 VD	82	}
	83
	84	static void dsa_tree_release(struct kref *ref)
	85	{
	86	struct dsa_switch_tree *dst;
	87
	88	dst = container_of(ref, struct dsa_switch_tree, refcount);
	89
	90	dsa_tree_free(dst);
	91	}
	92
	93	static void dsa_tree_put(struct dsa_switch_tree *dst)
	94	{
9e741045 VD	95	if (dst)
9e741045 VD	96	kref_put(&dst->refcount, dsa_tree_release);
65254108 VD	97	}
65254108 VD	98
293784a8	99	static bool dsa_port_is_dsa(struct dsa_port *port)
83c0afae	100	{
6d4e5c57	101	return port->type == DSA_PORT_TYPE_DSA;
293784a8 FF	102	}
	103
	104	static bool dsa_port_is_cpu(struct dsa_port *port)
	105	{
6d4e5c57	106	return port->type == DSA_PORT_TYPE_CPU;
83c0afae AL	107	}
83c0afae AL	108
f070464c VD	109	static bool dsa_port_is_user(struct dsa_port *dp)
	110	{
	111	return dp->type == DSA_PORT_TYPE_USER;
	112	}
	113
f163da88 VD	114	static struct dsa_port dsa_tree_find_port_by_node(struct dsa_switch_tree dst,
f163da88 VD	115	struct device_node *dn)
83c0afae AL	116	{
83c0afae AL	117	struct dsa_switch *ds;
f163da88 VD	118	struct dsa_port *dp;
f163da88 VD	119	int device, port;
83c0afae	120
f163da88 VD	121	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
f163da88 VD	122	ds = dst->ds[device];
83c0afae AL	123	if (!ds)
	124	continue;
	125
f163da88 VD	126	for (port = 0; port < ds->num_ports; port++) {
	127	dp = &ds->ports[port];
	128
	129	if (dp->dn == dn)
	130	return dp;
	131	}
83c0afae AL	132	}
	133
	134	return NULL;
	135	}
	136
34c09a89	137	static bool dsa_port_setup_routing_table(struct dsa_port *dp)
83c0afae	138	{
34c09a89 VD	139	struct dsa_switch *ds = dp->ds;
	140	struct dsa_switch_tree *dst = ds->dst;
	141	struct device_node *dn = dp->dn;
c5286665	142	struct of_phandle_iterator it;
f163da88	143	struct dsa_port *link_dp;
c5286665	144	int err;
83c0afae	145
c5286665 VD	146	of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
	147	link_dp = dsa_tree_find_port_by_node(dst, it.node);
	148	if (!link_dp) {
	149	of_node_put(it.node);
34c09a89	150	return false;
c5286665	151	}
83c0afae	152
34c09a89	153	ds->rtable[link_dp->ds->index] = dp->index;
83c0afae AL	154	}
83c0afae AL	155
34c09a89	156	return true;
83c0afae AL	157	}
83c0afae AL	158
34c09a89	159	static bool dsa_switch_setup_routing_table(struct dsa_switch *ds)
83c0afae	160	{
34c09a89 VD	161	bool complete = true;
	162	struct dsa_port *dp;
	163	int i;
83c0afae	164
34c09a89 VD	165	for (i = 0; i < DSA_MAX_SWITCHES; i++)
34c09a89 VD	166	ds->rtable[i] = DSA_RTABLE_NONE;
83c0afae	167
34c09a89 VD	168	for (i = 0; i < ds->num_ports; i++) {
34c09a89 VD	169	dp = &ds->ports[i];
83c0afae	170
34c09a89 VD	171	if (dsa_port_is_dsa(dp)) {
	172	complete = dsa_port_setup_routing_table(dp);
	173	if (!complete)
	174	break;
	175	}
83c0afae AL	176	}
83c0afae AL	177
34c09a89	178	return complete;
83c0afae AL	179	}
83c0afae AL	180
34c09a89	181	static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
83c0afae AL	182	{
83c0afae AL	183	struct dsa_switch *ds;
34c09a89 VD	184	bool complete = true;
34c09a89 VD	185	int device;
83c0afae	186
34c09a89 VD	187	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
34c09a89 VD	188	ds = dst->ds[device];
83c0afae AL	189	if (!ds)
	190	continue;
	191
34c09a89 VD	192	complete = dsa_switch_setup_routing_table(ds);
	193	if (!complete)
	194	break;
83c0afae AL	195	}
83c0afae AL	196
34c09a89	197	return complete;
83c0afae AL	198	}
83c0afae AL	199
f070464c VD	200	static struct dsa_port dsa_tree_find_first_cpu(struct dsa_switch_tree dst)
	201	{
	202	struct dsa_switch *ds;
	203	struct dsa_port *dp;
	204	int device, port;
	205
	206	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
	207	ds = dst->ds[device];
	208	if (!ds)
	209	continue;
	210
	211	for (port = 0; port < ds->num_ports; port++) {
	212	dp = &ds->ports[port];
	213
	214	if (dsa_port_is_cpu(dp))
	215	return dp;
	216	}
	217	}
	218
	219	return NULL;
	220	}
	221
	222	static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
	223	{
	224	struct dsa_switch *ds;
	225	struct dsa_port *dp;
	226	int device, port;
	227
	228	/* DSA currently only supports a single CPU port */
	229	dst->cpu_dp = dsa_tree_find_first_cpu(dst);
	230	if (!dst->cpu_dp) {
	231	pr_warn("Tree has no master device\n");
	232	return -EINVAL;
	233	}
	234
	235	/* Assign the default CPU port to all ports of the fabric */
	236	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
	237	ds = dst->ds[device];
	238	if (!ds)
	239	continue;
	240
	241	for (port = 0; port < ds->num_ports; port++) {
	242	dp = &ds->ports[port];
	243
	244	if (dsa_port_is_user(dp))
	245	dp->cpu_dp = dst->cpu_dp;
	246	}
	247	}
	248
	249	return 0;
	250	}
	251
	252	static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
	253	{
	254	/* DSA currently only supports a single CPU port */
	255	dst->cpu_dp = NULL;
	256	}
	257
1d27732f	258	static int dsa_port_setup(struct dsa_port *dp)
83c0afae	259	{
1d27732f	260	struct dsa_switch *ds = dp->ds;
83c0afae AL	261	int err;
83c0afae AL	262
1d27732f	263	memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));
83c0afae	264
1d27732f VD	265	err = devlink_port_register(ds->devlink, &dp->devlink_port, dp->index);
1d27732f VD	266	if (err)
83c0afae	267	return err;
83c0afae	268
1d27732f VD	269	switch (dp->type) {
	270	case DSA_PORT_TYPE_UNUSED:
	271	break;
	272	case DSA_PORT_TYPE_CPU:
	273	case DSA_PORT_TYPE_DSA:
	274	err = dsa_port_fixed_link_register_of(dp);
	275	if (err) {
	276	dev_err(ds->dev, "failed to register fixed link for port %d.%d\n",
	277	ds->index, dp->index);
	278	return err;
	279	}
83c0afae	280
1d27732f VD	281	break;
	282	case DSA_PORT_TYPE_USER:
	283	err = dsa_slave_create(dp);
	284	if (err)
	285	dev_err(ds->dev, "failed to create slave for port %d.%d\n",
	286	ds->index, dp->index);
	287	else
	288	devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
	289	break;
83c0afae AL	290	}
	291
	292	return 0;
	293	}
	294
1d27732f	295	static void dsa_port_teardown(struct dsa_port *dp)
83c0afae	296	{
1d27732f VD	297	devlink_port_unregister(&dp->devlink_port);
	298
	299	switch (dp->type) {
	300	case DSA_PORT_TYPE_UNUSED:
	301	break;
	302	case DSA_PORT_TYPE_CPU:
	303	case DSA_PORT_TYPE_DSA:
	304	dsa_port_fixed_link_unregister_of(dp);
	305	break;
	306	case DSA_PORT_TYPE_USER:
	307	if (dp->slave) {
	308	dsa_slave_destroy(dp->slave);
	309	dp->slave = NULL;
	310	}
	311	break;
83c0afae AL	312	}
	313	}
	314
1f08f9e9	315	static int dsa_switch_setup(struct dsa_switch *ds)
83c0afae	316	{
83c0afae AL	317	int err;
83c0afae AL	318
6e830d8f	319	/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
9d490b4e	320	* driver and before ops->setup() has run, since the switch drivers and
6e830d8f FF	321	* the slave MDIO bus driver rely on these values for probing PHY
	322	* devices or not
	323	*/
02bc6e54	324	ds->phys_mii_mask \|= dsa_user_ports(ds);
6e830d8f	325
96567d5d AL	326	/* Add the switch to devlink before calling setup, so that setup can
	327	* add dpipe tables
	328	*/
	329	ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
	330	if (!ds->devlink)
	331	return -ENOMEM;
	332
	333	err = devlink_register(ds->devlink, ds->dev);
	334	if (err)
	335	return err;
	336
9d490b4e	337	err = ds->ops->setup(ds);
83c0afae AL	338	if (err < 0)
	339	return err;
	340
f515f192 VD	341	err = dsa_switch_register_notifier(ds);
	342	if (err)
	343	return err;
	344
9d490b4e	345	if (!ds->slave_mii_bus && ds->ops->phy_read) {
1eb59443 FF	346	ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
	347	if (!ds->slave_mii_bus)
	348	return -ENOMEM;
	349
	350	dsa_slave_mii_bus_init(ds);
	351
	352	err = mdiobus_register(ds->slave_mii_bus);
	353	if (err < 0)
	354	return err;
	355	}
	356
83c0afae AL	357	return 0;
	358	}
	359
1f08f9e9	360	static void dsa_switch_teardown(struct dsa_switch *ds)
83c0afae	361	{
9d490b4e	362	if (ds->slave_mii_bus && ds->ops->phy_read)
1eb59443	363	mdiobus_unregister(ds->slave_mii_bus);
f515f192 VD	364
f515f192 VD	365	dsa_switch_unregister_notifier(ds);
96567d5d AL	366
	367	if (ds->devlink) {
	368	devlink_unregister(ds->devlink);
	369	devlink_free(ds->devlink);
	370	ds->devlink = NULL;
	371	}
	372
83c0afae AL	373	}
83c0afae AL	374
1f08f9e9 VD	375	static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
	376	{
	377	struct dsa_switch *ds;
1d27732f VD	378	struct dsa_port *dp;
1d27732f VD	379	int device, port;
1f08f9e9 VD	380	int err;
	381
	382	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
	383	ds = dst->ds[device];
	384	if (!ds)
	385	continue;
	386
	387	err = dsa_switch_setup(ds);
	388	if (err)
	389	return err;
1d27732f VD	390
	391	for (port = 0; port < ds->num_ports; port++) {
	392	dp = &ds->ports[port];
	393
	394	err = dsa_port_setup(dp);
	395	if (err)
	396	return err;
	397	}
1f08f9e9 VD	398	}
	399
	400	return 0;
	401	}
	402
	403	static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
	404	{
	405	struct dsa_switch *ds;
1d27732f VD	406	struct dsa_port *dp;
1d27732f VD	407	int device, port;
1f08f9e9 VD	408
	409	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
	410	ds = dst->ds[device];
	411	if (!ds)
	412	continue;
	413
1d27732f VD	414	for (port = 0; port < ds->num_ports; port++) {
	415	dp = &ds->ports[port];
	416
	417	dsa_port_teardown(dp);
	418	}
	419
1f08f9e9 VD	420	dsa_switch_teardown(ds);
	421	}
	422	}
	423
17a22fcf VD	424	static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
	425	{
	426	struct dsa_port *cpu_dp = dst->cpu_dp;
	427	struct net_device *master = cpu_dp->master;
	428
	429	/* DSA currently supports a single pair of CPU port and master device */
	430	return dsa_master_setup(master, cpu_dp);
	431	}
	432
	433	static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
	434	{
	435	struct dsa_port *cpu_dp = dst->cpu_dp;
	436	struct net_device *master = cpu_dp->master;
	437
	438	return dsa_master_teardown(master);
	439	}
	440
ec15dd42	441	static int dsa_tree_setup(struct dsa_switch_tree *dst)
83c0afae	442	{
34c09a89	443	bool complete;
83c0afae AL	444	int err;
83c0afae AL	445
ec15dd42 VD	446	if (dst->setup) {
	447	pr_err("DSA: tree %d already setup! Disjoint trees?\n",
	448	dst->index);
	449	return -EEXIST;
	450	}
	451
34c09a89 VD	452	complete = dsa_tree_setup_routing_table(dst);
	453	if (!complete)
	454	return 0;
	455
f070464c VD	456	err = dsa_tree_setup_default_cpu(dst);
	457	if (err)
	458	return err;
	459
1f08f9e9 VD	460	err = dsa_tree_setup_switches(dst);
	461	if (err)
	462	return err;
83c0afae	463
17a22fcf	464	err = dsa_tree_setup_master(dst);
1943563d VD	465	if (err)
	466	return err;
	467
ec15dd42 VD	468	dst->setup = true;
	469
	470	pr_info("DSA: tree %d setup\n", dst->index);
83c0afae AL	471
	472	return 0;
	473	}
	474
ec15dd42	475	static void dsa_tree_teardown(struct dsa_switch_tree *dst)
83c0afae	476	{
ec15dd42	477	if (!dst->setup)
83c0afae AL	478	return;
83c0afae AL	479
17a22fcf	480	dsa_tree_teardown_master(dst);
83c0afae	481
1f08f9e9	482	dsa_tree_teardown_switches(dst);
83c0afae	483
f070464c	484	dsa_tree_teardown_default_cpu(dst);
0c73c523	485
ec15dd42 VD	486	pr_info("DSA: tree %d torn down\n", dst->index);
	487
	488	dst->setup = false;
83c0afae AL	489	}
83c0afae AL	490
6da2a940 VD	491	static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
	492	unsigned int index)
	493	{
30817354 VD	494	dsa_tree_teardown(dst);
30817354 VD	495
6da2a940 VD	496	dst->ds[index] = NULL;
	497	dsa_tree_put(dst);
	498	}
	499
	500	static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
	501	struct dsa_switch *ds)
	502	{
	503	unsigned int index = ds->index;
30817354	504	int err;
6da2a940 VD	505
	506	if (dst->ds[index])
	507	return -EBUSY;
	508
	509	dsa_tree_get(dst);
	510	dst->ds[index] = ds;
	511
30817354 VD	512	err = dsa_tree_setup(dst);
	513	if (err)
	514	dsa_tree_remove_switch(dst, index);
	515
	516	return err;
6da2a940 VD	517	}
6da2a940 VD	518
06e24d08 VD	519	static int dsa_port_parse_user(struct dsa_port dp, const char name)
	520	{
	521	if (!name)
	522	name = "eth%d";
	523
	524	dp->type = DSA_PORT_TYPE_USER;
	525	dp->name = name;
	526
	527	return 0;
	528	}
	529
	530	static int dsa_port_parse_dsa(struct dsa_port *dp)
	531	{
	532	dp->type = DSA_PORT_TYPE_DSA;
	533
	534	return 0;
	535	}
	536
	537	static int dsa_port_parse_cpu(struct dsa_port dp, struct net_device master)
	538	{
7354fcb0 VD	539	struct dsa_switch *ds = dp->ds;
	540	struct dsa_switch_tree *dst = ds->dst;
	541	const struct dsa_device_ops *tag_ops;
	542	enum dsa_tag_protocol tag_protocol;
	543
5ed4e3eb	544	tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
7354fcb0 VD	545	tag_ops = dsa_resolve_tag_protocol(tag_protocol);
	546	if (IS_ERR(tag_ops)) {
	547	dev_warn(ds->dev, "No tagger for this switch\n");
	548	return PTR_ERR(tag_ops);
	549	}
	550
06e24d08	551	dp->type = DSA_PORT_TYPE_CPU;
7354fcb0 VD	552	dp->rcv = tag_ops->rcv;
7354fcb0 VD	553	dp->tag_ops = tag_ops;
06e24d08	554	dp->master = master;
7354fcb0	555	dp->dst = dst;
06e24d08 VD	556
	557	return 0;
	558	}
	559
fd223e2e VD	560	static int dsa_port_parse_of(struct dsa_port dp, struct device_node dn)
fd223e2e VD	561	{
6d4e5c57	562	struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
1838fa89	563	const char *name = of_get_property(dn, "label", NULL);
54df6fa9	564	bool link = of_property_read_bool(dn, "link");
6d4e5c57	565
06e24d08 VD	566	dp->dn = dn;
06e24d08 VD	567
6d4e5c57	568	if (ethernet) {
cbabb0ac VD	569	struct net_device *master;
	570
	571	master = of_find_net_device_by_node(ethernet);
	572	if (!master)
	573	return -EPROBE_DEFER;
	574
06e24d08	575	return dsa_port_parse_cpu(dp, master);
6d4e5c57 VD	576	}
6d4e5c57 VD	577
06e24d08 VD	578	if (link)
06e24d08 VD	579	return dsa_port_parse_dsa(dp);
fd223e2e	580
06e24d08	581	return dsa_port_parse_user(dp, name);
fd223e2e VD	582	}
fd223e2e VD	583
975e6e32 VD	584	static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
975e6e32 VD	585	struct device_node *dn)
83c0afae	586	{
5b32fe07	587	struct device_node ports, port;
fd223e2e	588	struct dsa_port *dp;
83c0afae	589	u32 reg;
5b32fe07 VD	590	int err;
	591
	592	ports = of_get_child_by_name(dn, "ports");
	593	if (!ports) {
	594	dev_err(ds->dev, "no ports child node found\n");
	595	return -EINVAL;
	596	}
83c0afae AL	597
	598	for_each_available_child_of_node(ports, port) {
	599	err = of_property_read_u32(port, "reg", &reg);
	600	if (err)
	601	return err;
	602
26895e29	603	if (reg >= ds->num_ports)
83c0afae AL	604	return -EINVAL;
83c0afae AL	605
fd223e2e VD	606	dp = &ds->ports[reg];
	607
	608	err = dsa_port_parse_of(dp, port);
	609	if (err)
	610	return err;
83c0afae AL	611	}
	612
	613	return 0;
	614	}
	615
975e6e32 VD	616	static int dsa_switch_parse_member_of(struct dsa_switch *ds,
	617	struct device_node *dn)
	618	{
	619	u32 m[2] = { 0, 0 };
	620	int sz;
	621
	622	/* Don't error out if this optional property isn't found */
	623	sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
	624	if (sz < 0 && sz != -EINVAL)
	625	return sz;
	626
	627	ds->index = m[1];
	628	if (ds->index >= DSA_MAX_SWITCHES)
	629	return -EINVAL;
	630
	631	ds->dst = dsa_tree_touch(m[0]);
	632	if (!ds->dst)
	633	return -ENOMEM;
	634
	635	return 0;
	636	}
	637
	638	static int dsa_switch_parse_of(struct dsa_switch ds, struct device_node dn)
	639	{
	640	int err;
	641
	642	err = dsa_switch_parse_member_of(ds, dn);
	643	if (err)
	644	return err;
	645
	646	return dsa_switch_parse_ports_of(ds, dn);
	647	}
	648
fd223e2e VD	649	static int dsa_port_parse(struct dsa_port dp, const char name,
	650	struct device *dev)
	651	{
6d4e5c57	652	if (!strcmp(name, "cpu")) {
cbabb0ac VD	653	struct net_device *master;
	654
	655	master = dsa_dev_to_net_device(dev);
	656	if (!master)
	657	return -EPROBE_DEFER;
	658
	659	dev_put(master);
	660
06e24d08	661	return dsa_port_parse_cpu(dp, master);
6d4e5c57 VD	662	}
6d4e5c57 VD	663
06e24d08 VD	664	if (!strcmp(name, "dsa"))
06e24d08 VD	665	return dsa_port_parse_dsa(dp);
fd223e2e	666
06e24d08	667	return dsa_port_parse_user(dp, name);
fd223e2e VD	668	}
fd223e2e VD	669
975e6e32 VD	670	static int dsa_switch_parse_ports(struct dsa_switch *ds,
975e6e32 VD	671	struct dsa_chip_data *cd)
71e0bbde FF	672	{
71e0bbde FF	673	bool valid_name_found = false;
fd223e2e VD	674	struct dsa_port *dp;
	675	struct device *dev;
	676	const char *name;
71e0bbde	677	unsigned int i;
fd223e2e	678	int err;
71e0bbde FF	679
71e0bbde FF	680	for (i = 0; i < DSA_MAX_PORTS; i++) {
fd223e2e VD	681	name = cd->port_names[i];
	682	dev = cd->netdev[i];
	683	dp = &ds->ports[i];
	684
	685	if (!name)
71e0bbde FF	686	continue;
71e0bbde FF	687
fd223e2e VD	688	err = dsa_port_parse(dp, name, dev);
	689	if (err)
	690	return err;
	691
71e0bbde FF	692	valid_name_found = true;
	693	}
	694
	695	if (!valid_name_found && i == DSA_MAX_PORTS)
	696	return -EINVAL;
	697
	698	return 0;
	699	}
	700
975e6e32	701	static int dsa_switch_parse(struct dsa_switch ds, struct dsa_chip_data cd)
71e0bbde	702	{
975e6e32	703	ds->cd = cd;
71e0bbde	704
975e6e32 VD	705	/* We don't support interconnected switches nor multiple trees via
	706	* platform data, so this is the unique switch of the tree.
	707	*/
	708	ds->index = 0;
	709	ds->dst = dsa_tree_touch(0);
	710	if (!ds->dst)
	711	return -ENOMEM;
71e0bbde	712
975e6e32	713	return dsa_switch_parse_ports(ds, cd);
71e0bbde FF	714	}
71e0bbde FF	715
30817354 VD	716	static int dsa_switch_add(struct dsa_switch *ds)
	717	{
	718	struct dsa_switch_tree *dst = ds->dst;
	719
	720	return dsa_tree_add_switch(dst, ds);
	721	}
	722
b4fbb347	723	static int dsa_switch_probe(struct dsa_switch *ds)
83c0afae	724	{
23c9ee49 VD	725	struct dsa_chip_data *pdata = ds->dev->platform_data;
23c9ee49 VD	726	struct device_node *np = ds->dev->of_node;
34c09a89	727	int err;
83c0afae	728
975e6e32 VD	729	if (np)
	730	err = dsa_switch_parse_of(ds, np);
	731	else if (pdata)
	732	err = dsa_switch_parse(ds, pdata);
	733	else
	734	err = -ENODEV;
83c0afae	735
975e6e32 VD	736	if (err)
975e6e32 VD	737	return err;
d390238c	738
30817354	739	return dsa_switch_add(ds);
83c0afae AL	740	}
83c0afae AL	741
a0c02161 VD	742	struct dsa_switch dsa_switch_alloc(struct device dev, size_t n)
	743	{
	744	size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
	745	struct dsa_switch *ds;
818be848	746	int i;
a0c02161 VD	747
	748	ds = devm_kzalloc(dev, size, GFP_KERNEL);
	749	if (!ds)
	750	return NULL;
	751
	752	ds->dev = dev;
	753	ds->num_ports = n;
	754
818be848 VD	755	for (i = 0; i < ds->num_ports; ++i) {
	756	ds->ports[i].index = i;
	757	ds->ports[i].ds = ds;
	758	}
	759
a0c02161 VD	760	return ds;
	761	}
	762	EXPORT_SYMBOL_GPL(dsa_switch_alloc);
	763
23c9ee49	764	int dsa_register_switch(struct dsa_switch *ds)
83c0afae AL	765	{
	766	int err;
	767
	768	mutex_lock(&dsa2_mutex);
b4fbb347	769	err = dsa_switch_probe(ds);
9e741045	770	dsa_tree_put(ds->dst);
83c0afae AL	771	mutex_unlock(&dsa2_mutex);
	772
	773	return err;
	774	}
	775	EXPORT_SYMBOL_GPL(dsa_register_switch);
	776
b4fbb347	777	static void dsa_switch_remove(struct dsa_switch *ds)
83c0afae AL	778	{
83c0afae AL	779	struct dsa_switch_tree *dst = ds->dst;
6da2a940	780	unsigned int index = ds->index;
83c0afae	781
6da2a940	782	dsa_tree_remove_switch(dst, index);
83c0afae AL	783	}
	784
	785	void dsa_unregister_switch(struct dsa_switch *ds)
	786	{
	787	mutex_lock(&dsa2_mutex);
b4fbb347	788	dsa_switch_remove(ds);
83c0afae AL	789	mutex_unlock(&dsa2_mutex);
	790	}
	791	EXPORT_SYMBOL_GPL(dsa_unregister_switch);