[linux-2.6-block.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) || dsa_port_is_dsa(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_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;
		}
		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_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
986d7ccf	244	if (dsa_port_is_user(dp) \|\| dsa_port_is_dsa(dp))
f070464c VD	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:
33615367	274	err = dsa_port_link_register_of(dp);
1d27732f	275	if (err) {
33615367	276	dev_err(ds->dev, "failed to setup link for port %d.%d\n",
1d27732f VD	277	ds->index, dp->index);
	278	return err;
	279	}
1d27732f VD	280	break;
	281	case DSA_PORT_TYPE_USER:
	282	err = dsa_slave_create(dp);
	283	if (err)
	284	dev_err(ds->dev, "failed to create slave for port %d.%d\n",
	285	ds->index, dp->index);
	286	else
	287	devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
	288	break;
83c0afae AL	289	}
	290
	291	return 0;
	292	}
	293
1d27732f	294	static void dsa_port_teardown(struct dsa_port *dp)
83c0afae	295	{
1d27732f VD	296	devlink_port_unregister(&dp->devlink_port);
	297
	298	switch (dp->type) {
	299	case DSA_PORT_TYPE_UNUSED:
	300	break;
	301	case DSA_PORT_TYPE_CPU:
	302	case DSA_PORT_TYPE_DSA:
33615367	303	dsa_port_link_unregister_of(dp);
1d27732f VD	304	break;
	305	case DSA_PORT_TYPE_USER:
	306	if (dp->slave) {
	307	dsa_slave_destroy(dp->slave);
	308	dp->slave = NULL;
	309	}
	310	break;
83c0afae AL	311	}
	312	}
	313
1f08f9e9	314	static int dsa_switch_setup(struct dsa_switch *ds)
83c0afae	315	{
83c0afae AL	316	int err;
83c0afae AL	317
6e830d8f	318	/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
9d490b4e	319	* driver and before ops->setup() has run, since the switch drivers and
6e830d8f FF	320	* the slave MDIO bus driver rely on these values for probing PHY
	321	* devices or not
	322	*/
02bc6e54	323	ds->phys_mii_mask \|= dsa_user_ports(ds);
6e830d8f	324
96567d5d AL	325	/* Add the switch to devlink before calling setup, so that setup can
	326	* add dpipe tables
	327	*/
	328	ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
	329	if (!ds->devlink)
	330	return -ENOMEM;
	331
	332	err = devlink_register(ds->devlink, ds->dev);
	333	if (err)
	334	return err;
	335
9d490b4e	336	err = ds->ops->setup(ds);
83c0afae AL	337	if (err < 0)
	338	return err;
	339
f515f192 VD	340	err = dsa_switch_register_notifier(ds);
	341	if (err)
	342	return err;
	343
9d490b4e	344	if (!ds->slave_mii_bus && ds->ops->phy_read) {
1eb59443 FF	345	ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
	346	if (!ds->slave_mii_bus)
	347	return -ENOMEM;
	348
	349	dsa_slave_mii_bus_init(ds);
	350
	351	err = mdiobus_register(ds->slave_mii_bus);
	352	if (err < 0)
	353	return err;
	354	}
	355
83c0afae AL	356	return 0;
	357	}
	358
1f08f9e9	359	static void dsa_switch_teardown(struct dsa_switch *ds)
83c0afae	360	{
9d490b4e	361	if (ds->slave_mii_bus && ds->ops->phy_read)
1eb59443	362	mdiobus_unregister(ds->slave_mii_bus);
f515f192 VD	363
f515f192 VD	364	dsa_switch_unregister_notifier(ds);
96567d5d AL	365
	366	if (ds->devlink) {
	367	devlink_unregister(ds->devlink);
	368	devlink_free(ds->devlink);
	369	ds->devlink = NULL;
	370	}
	371
83c0afae AL	372	}
83c0afae AL	373
1f08f9e9 VD	374	static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
	375	{
	376	struct dsa_switch *ds;
1d27732f VD	377	struct dsa_port *dp;
1d27732f VD	378	int device, port;
1f08f9e9 VD	379	int err;
	380
	381	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
	382	ds = dst->ds[device];
	383	if (!ds)
	384	continue;
	385
	386	err = dsa_switch_setup(ds);
	387	if (err)
	388	return err;
1d27732f VD	389
	390	for (port = 0; port < ds->num_ports; port++) {
	391	dp = &ds->ports[port];
	392
	393	err = dsa_port_setup(dp);
	394	if (err)
	395	return err;
	396	}
1f08f9e9 VD	397	}
	398
	399	return 0;
	400	}
	401
	402	static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
	403	{
	404	struct dsa_switch *ds;
1d27732f VD	405	struct dsa_port *dp;
1d27732f VD	406	int device, port;
1f08f9e9 VD	407
	408	for (device = 0; device < DSA_MAX_SWITCHES; device++) {
	409	ds = dst->ds[device];
	410	if (!ds)
	411	continue;
	412
1d27732f VD	413	for (port = 0; port < ds->num_ports; port++) {
	414	dp = &ds->ports[port];
	415
	416	dsa_port_teardown(dp);
	417	}
	418
1f08f9e9 VD	419	dsa_switch_teardown(ds);
	420	}
	421	}
	422
17a22fcf VD	423	static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
	424	{
	425	struct dsa_port *cpu_dp = dst->cpu_dp;
	426	struct net_device *master = cpu_dp->master;
	427
	428	/* DSA currently supports a single pair of CPU port and master device */
	429	return dsa_master_setup(master, cpu_dp);
	430	}
	431
	432	static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
	433	{
	434	struct dsa_port *cpu_dp = dst->cpu_dp;
	435	struct net_device *master = cpu_dp->master;
	436
	437	return dsa_master_teardown(master);
	438	}
	439
ec15dd42	440	static int dsa_tree_setup(struct dsa_switch_tree *dst)
83c0afae	441	{
34c09a89	442	bool complete;
83c0afae AL	443	int err;
83c0afae AL	444
ec15dd42 VD	445	if (dst->setup) {
	446	pr_err("DSA: tree %d already setup! Disjoint trees?\n",
	447	dst->index);
	448	return -EEXIST;
	449	}
	450
34c09a89 VD	451	complete = dsa_tree_setup_routing_table(dst);
	452	if (!complete)
	453	return 0;
	454
f070464c VD	455	err = dsa_tree_setup_default_cpu(dst);
	456	if (err)
	457	return err;
	458
1f08f9e9 VD	459	err = dsa_tree_setup_switches(dst);
	460	if (err)
	461	return err;
83c0afae	462
17a22fcf	463	err = dsa_tree_setup_master(dst);
1943563d VD	464	if (err)
	465	return err;
	466
ec15dd42 VD	467	dst->setup = true;
	468
	469	pr_info("DSA: tree %d setup\n", dst->index);
83c0afae AL	470
	471	return 0;
	472	}
	473
ec15dd42	474	static void dsa_tree_teardown(struct dsa_switch_tree *dst)
83c0afae	475	{
ec15dd42	476	if (!dst->setup)
83c0afae AL	477	return;
83c0afae AL	478
17a22fcf	479	dsa_tree_teardown_master(dst);
83c0afae	480
1f08f9e9	481	dsa_tree_teardown_switches(dst);
83c0afae	482
f070464c	483	dsa_tree_teardown_default_cpu(dst);
0c73c523	484
ec15dd42 VD	485	pr_info("DSA: tree %d torn down\n", dst->index);
	486
	487	dst->setup = false;
83c0afae AL	488	}
83c0afae AL	489
6da2a940 VD	490	static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
	491	unsigned int index)
	492	{
30817354 VD	493	dsa_tree_teardown(dst);
30817354 VD	494
6da2a940 VD	495	dst->ds[index] = NULL;
	496	dsa_tree_put(dst);
	497	}
	498
	499	static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
	500	struct dsa_switch *ds)
	501	{
	502	unsigned int index = ds->index;
30817354	503	int err;
6da2a940 VD	504
	505	if (dst->ds[index])
	506	return -EBUSY;
	507
	508	dsa_tree_get(dst);
	509	dst->ds[index] = ds;
	510
30817354 VD	511	err = dsa_tree_setup(dst);
	512	if (err)
	513	dsa_tree_remove_switch(dst, index);
	514
	515	return err;
6da2a940 VD	516	}
6da2a940 VD	517
06e24d08 VD	518	static int dsa_port_parse_user(struct dsa_port dp, const char name)
	519	{
	520	if (!name)
	521	name = "eth%d";
	522
	523	dp->type = DSA_PORT_TYPE_USER;
	524	dp->name = name;
	525
	526	return 0;
	527	}
	528
	529	static int dsa_port_parse_dsa(struct dsa_port *dp)
	530	{
	531	dp->type = DSA_PORT_TYPE_DSA;
	532
	533	return 0;
	534	}
	535
	536	static int dsa_port_parse_cpu(struct dsa_port dp, struct net_device master)
	537	{
7354fcb0 VD	538	struct dsa_switch *ds = dp->ds;
	539	struct dsa_switch_tree *dst = ds->dst;
	540	const struct dsa_device_ops *tag_ops;
	541	enum dsa_tag_protocol tag_protocol;
	542
5ed4e3eb	543	tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
7354fcb0 VD	544	tag_ops = dsa_resolve_tag_protocol(tag_protocol);
	545	if (IS_ERR(tag_ops)) {
	546	dev_warn(ds->dev, "No tagger for this switch\n");
	547	return PTR_ERR(tag_ops);
	548	}
	549
06e24d08	550	dp->type = DSA_PORT_TYPE_CPU;
7354fcb0 VD	551	dp->rcv = tag_ops->rcv;
7354fcb0 VD	552	dp->tag_ops = tag_ops;
06e24d08	553	dp->master = master;
7354fcb0	554	dp->dst = dst;
06e24d08 VD	555
	556	return 0;
	557	}
	558
fd223e2e VD	559	static int dsa_port_parse_of(struct dsa_port dp, struct device_node dn)
fd223e2e VD	560	{
6d4e5c57	561	struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
1838fa89	562	const char *name = of_get_property(dn, "label", NULL);
54df6fa9	563	bool link = of_property_read_bool(dn, "link");
6d4e5c57	564
06e24d08 VD	565	dp->dn = dn;
06e24d08 VD	566
6d4e5c57	567	if (ethernet) {
cbabb0ac VD	568	struct net_device *master;
	569
	570	master = of_find_net_device_by_node(ethernet);
	571	if (!master)
	572	return -EPROBE_DEFER;
	573
06e24d08	574	return dsa_port_parse_cpu(dp, master);
6d4e5c57 VD	575	}
6d4e5c57 VD	576
06e24d08 VD	577	if (link)
06e24d08 VD	578	return dsa_port_parse_dsa(dp);
fd223e2e	579
06e24d08	580	return dsa_port_parse_user(dp, name);
fd223e2e VD	581	}
fd223e2e VD	582
975e6e32 VD	583	static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
975e6e32 VD	584	struct device_node *dn)
83c0afae	585	{
5b32fe07	586	struct device_node ports, port;
fd223e2e	587	struct dsa_port *dp;
83c0afae	588	u32 reg;
5b32fe07 VD	589	int err;
	590
	591	ports = of_get_child_by_name(dn, "ports");
	592	if (!ports) {
	593	dev_err(ds->dev, "no ports child node found\n");
	594	return -EINVAL;
	595	}
83c0afae AL	596
	597	for_each_available_child_of_node(ports, port) {
	598	err = of_property_read_u32(port, "reg", &reg);
	599	if (err)
	600	return err;
	601
26895e29	602	if (reg >= ds->num_ports)
83c0afae AL	603	return -EINVAL;
83c0afae AL	604
fd223e2e VD	605	dp = &ds->ports[reg];
	606
	607	err = dsa_port_parse_of(dp, port);
	608	if (err)
	609	return err;
83c0afae AL	610	}
	611
	612	return 0;
	613	}
	614
975e6e32 VD	615	static int dsa_switch_parse_member_of(struct dsa_switch *ds,
	616	struct device_node *dn)
	617	{
	618	u32 m[2] = { 0, 0 };
	619	int sz;
	620
	621	/* Don't error out if this optional property isn't found */
	622	sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
	623	if (sz < 0 && sz != -EINVAL)
	624	return sz;
	625
	626	ds->index = m[1];
	627	if (ds->index >= DSA_MAX_SWITCHES)
	628	return -EINVAL;
	629
	630	ds->dst = dsa_tree_touch(m[0]);
	631	if (!ds->dst)
	632	return -ENOMEM;
	633
	634	return 0;
	635	}
	636
	637	static int dsa_switch_parse_of(struct dsa_switch ds, struct device_node dn)
	638	{
	639	int err;
	640
	641	err = dsa_switch_parse_member_of(ds, dn);
	642	if (err)
	643	return err;
	644
	645	return dsa_switch_parse_ports_of(ds, dn);
	646	}
	647
fd223e2e VD	648	static int dsa_port_parse(struct dsa_port dp, const char name,
	649	struct device *dev)
	650	{
6d4e5c57	651	if (!strcmp(name, "cpu")) {
cbabb0ac VD	652	struct net_device *master;
	653
	654	master = dsa_dev_to_net_device(dev);
	655	if (!master)
	656	return -EPROBE_DEFER;
	657
	658	dev_put(master);
	659
06e24d08	660	return dsa_port_parse_cpu(dp, master);
6d4e5c57 VD	661	}
6d4e5c57 VD	662
06e24d08 VD	663	if (!strcmp(name, "dsa"))
06e24d08 VD	664	return dsa_port_parse_dsa(dp);
fd223e2e	665
06e24d08	666	return dsa_port_parse_user(dp, name);
fd223e2e VD	667	}
fd223e2e VD	668
975e6e32 VD	669	static int dsa_switch_parse_ports(struct dsa_switch *ds,
975e6e32 VD	670	struct dsa_chip_data *cd)
71e0bbde FF	671	{
71e0bbde FF	672	bool valid_name_found = false;
fd223e2e VD	673	struct dsa_port *dp;
	674	struct device *dev;
	675	const char *name;
71e0bbde	676	unsigned int i;
fd223e2e	677	int err;
71e0bbde FF	678
71e0bbde FF	679	for (i = 0; i < DSA_MAX_PORTS; i++) {
fd223e2e VD	680	name = cd->port_names[i];
	681	dev = cd->netdev[i];
	682	dp = &ds->ports[i];
	683
	684	if (!name)
71e0bbde FF	685	continue;
71e0bbde FF	686
fd223e2e VD	687	err = dsa_port_parse(dp, name, dev);
	688	if (err)
	689	return err;
	690
71e0bbde FF	691	valid_name_found = true;
	692	}
	693
	694	if (!valid_name_found && i == DSA_MAX_PORTS)
	695	return -EINVAL;
	696
	697	return 0;
	698	}
	699
975e6e32	700	static int dsa_switch_parse(struct dsa_switch ds, struct dsa_chip_data cd)
71e0bbde	701	{
975e6e32	702	ds->cd = cd;
71e0bbde	703
975e6e32 VD	704	/* We don't support interconnected switches nor multiple trees via
	705	* platform data, so this is the unique switch of the tree.
	706	*/
	707	ds->index = 0;
	708	ds->dst = dsa_tree_touch(0);
	709	if (!ds->dst)
	710	return -ENOMEM;
71e0bbde	711
975e6e32	712	return dsa_switch_parse_ports(ds, cd);
71e0bbde FF	713	}
71e0bbde FF	714
30817354 VD	715	static int dsa_switch_add(struct dsa_switch *ds)
	716	{
	717	struct dsa_switch_tree *dst = ds->dst;
	718
	719	return dsa_tree_add_switch(dst, ds);
	720	}
	721
b4fbb347	722	static int dsa_switch_probe(struct dsa_switch *ds)
83c0afae	723	{
23c9ee49 VD	724	struct dsa_chip_data *pdata = ds->dev->platform_data;
23c9ee49 VD	725	struct device_node *np = ds->dev->of_node;
34c09a89	726	int err;
83c0afae	727
975e6e32 VD	728	if (np)
	729	err = dsa_switch_parse_of(ds, np);
	730	else if (pdata)
	731	err = dsa_switch_parse(ds, pdata);
	732	else
	733	err = -ENODEV;
83c0afae	734
975e6e32 VD	735	if (err)
975e6e32 VD	736	return err;
d390238c	737
30817354	738	return dsa_switch_add(ds);
83c0afae AL	739	}
83c0afae AL	740
a0c02161 VD	741	struct dsa_switch dsa_switch_alloc(struct device dev, size_t n)
	742	{
	743	size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
	744	struct dsa_switch *ds;
818be848	745	int i;
a0c02161 VD	746
	747	ds = devm_kzalloc(dev, size, GFP_KERNEL);
	748	if (!ds)
	749	return NULL;
	750
	751	ds->dev = dev;
	752	ds->num_ports = n;
	753
818be848 VD	754	for (i = 0; i < ds->num_ports; ++i) {
	755	ds->ports[i].index = i;
	756	ds->ports[i].ds = ds;
	757	}
	758
a0c02161 VD	759	return ds;
	760	}
	761	EXPORT_SYMBOL_GPL(dsa_switch_alloc);
	762
23c9ee49	763	int dsa_register_switch(struct dsa_switch *ds)
83c0afae AL	764	{
	765	int err;
	766
	767	mutex_lock(&dsa2_mutex);
b4fbb347	768	err = dsa_switch_probe(ds);
9e741045	769	dsa_tree_put(ds->dst);
83c0afae AL	770	mutex_unlock(&dsa2_mutex);
	771
	772	return err;
	773	}
	774	EXPORT_SYMBOL_GPL(dsa_register_switch);
	775
b4fbb347	776	static void dsa_switch_remove(struct dsa_switch *ds)
83c0afae AL	777	{
83c0afae AL	778	struct dsa_switch_tree *dst = ds->dst;
6da2a940	779	unsigned int index = ds->index;
83c0afae	780
6da2a940	781	dsa_tree_remove_switch(dst, index);
83c0afae AL	782	}
	783
	784	void dsa_unregister_switch(struct dsa_switch *ds)
	785	{
	786	mutex_lock(&dsa2_mutex);
b4fbb347	787	dsa_switch_remove(ds);
83c0afae AL	788	mutex_unlock(&dsa2_mutex);
	789	}
	790	EXPORT_SYMBOL_GPL(dsa_unregister_switch);