Release 4.11 net/dsa/dsa.c

/*
 * net/dsa/dsa.c - Hardware switch handling
 * Copyright (c) 2008-2009 Marvell Semiconductor
 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
 *
 * 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/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <net/dsa.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/of_gpio.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include <linux/gpio/consumer.h>
#include "dsa_priv.h"



static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
					    struct net_device *dev)
{
	/* Just return the original SKB */
	return skb;
}

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static const struct dsa_device_ops none_ops = {
	.xmit	= dsa_slave_notag_xmit,
	.rcv	= NULL,
};


const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_DSA
	[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
	[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
	[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_BRCM
	[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_QCA
	[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
#endif
	[DSA_TAG_PROTO_NONE] = &none_ops,
};

/* switch driver registration ***********************************************/
static DEFINE_MUTEX(dsa_switch_drivers_mutex);
static LIST_HEAD(dsa_switch_drivers);



void register_switch_driver(struct dsa_switch_driver *drv)
{
	mutex_lock(&dsa_switch_drivers_mutex);
	list_add_tail(&drv->list, &dsa_switch_drivers);
	mutex_unlock(&dsa_switch_drivers_mutex);
}
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EXPORT_SYMBOL_GPL(register_switch_driver);



void unregister_switch_driver(struct dsa_switch_driver *drv)
{
	mutex_lock(&dsa_switch_drivers_mutex);
	list_del_init(&drv->list);
	mutex_unlock(&dsa_switch_drivers_mutex);
}
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EXPORT_SYMBOL_GPL(unregister_switch_driver);


static const struct dsa_switch_ops *

dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
		 const char **_name, void **priv)
{
	const struct dsa_switch_ops *ret;
	struct list_head *list;
	const char *name;

	ret = NULL;
	name = NULL;

	mutex_lock(&dsa_switch_drivers_mutex);
	list_for_each(list, &dsa_switch_drivers) {
		const struct dsa_switch_ops *ops;
		struct dsa_switch_driver *drv;

		drv = list_entry(list, struct dsa_switch_driver, list);
		ops = drv->ops;

		name = ops->probe(parent, host_dev, sw_addr, priv);
		if (name != NULL) {
			ret = ops;
			break;
		}
	}
	mutex_unlock(&dsa_switch_drivers_mutex);

	*_name = name;

	return ret;
}

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/* basic switch operations **************************************************/


int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
		      struct dsa_port *dport, int port)
{
	struct device_node *port_dn = dport->dn;
	struct phy_device *phydev;
	int ret, mode;

	if (of_phy_is_fixed_link(port_dn)) {
		ret = of_phy_register_fixed_link(port_dn);
		if (ret) {
			dev_err(dev, "failed to register fixed PHY\n");
			return ret;
		}
		phydev = of_phy_find_device(port_dn);

		mode = of_get_phy_mode(port_dn);
		if (mode < 0)
			mode = PHY_INTERFACE_MODE_NA;
		phydev->interface = mode;

		genphy_config_init(phydev);
		genphy_read_status(phydev);
		if (ds->ops->adjust_link)
			ds->ops->adjust_link(ds, port, phydev);

		put_device(&phydev->mdio.dev);
	}

	return 0;
}

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static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
{
	struct dsa_port *dport;
	int ret, port;

	for (port = 0; port < ds->num_ports; port++) {
		if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
			continue;

		dport = &ds->ports[port];
		ret = dsa_cpu_dsa_setup(ds, dev, dport, port);
		if (ret)
			return ret;
	}
	return 0;
}

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const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
{
	const struct dsa_device_ops *ops;

	if (tag_protocol >= DSA_TAG_LAST)
		return ERR_PTR(-EINVAL);
	ops = dsa_device_ops[tag_protocol];

	if (!ops)
		return ERR_PTR(-ENOPROTOOPT);

	return ops;
}

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int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds)
{
	struct net_device *master;
	struct ethtool_ops *cpu_ops;

	master = ds->dst->master_netdev;
	if (ds->master_netdev)
		master = ds->master_netdev;

	cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
	if (!cpu_ops)
		return -ENOMEM;

	memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
	       sizeof(struct ethtool_ops));
	ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
	memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
	       sizeof(struct ethtool_ops));
	dsa_cpu_port_ethtool_init(cpu_ops);
	master->ethtool_ops = cpu_ops;

	return 0;
}

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void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds)
{
	struct net_device *master;

	master = ds->dst->master_netdev;
	if (ds->master_netdev)
		master = ds->master_netdev;

	master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
}

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static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
{
	const struct dsa_switch_ops *ops = ds->ops;
	struct dsa_switch_tree *dst = ds->dst;
	struct dsa_chip_data *cd = ds->cd;
	bool valid_name_found = false;
	int index = ds->index;
	int i, ret;

	/*
         * Validate supplied switch configuration.
         */
	for (i = 0; i < ds->num_ports; i++) {
		char *name;

		name = cd->port_names[i];
		if (name == NULL)
			continue;

		if (!strcmp(name, "cpu")) {
			if (dst->cpu_switch) {
				netdev_err(dst->master_netdev,
					   "multiple cpu ports?!\n");
				return -EINVAL;
			}
			dst->cpu_switch = ds;
			dst->cpu_port = i;
			ds->cpu_port_mask |= 1 << i;
		} else if (!strcmp(name, "dsa")) {
			ds->dsa_port_mask |= 1 << i;
		} else {
			ds->enabled_port_mask |= 1 << i;
		}
		valid_name_found = true;
	}

	if (!valid_name_found && i == ds->num_ports)
		return -EINVAL;

	/* Make the built-in MII bus mask match the number of ports,
         * switch drivers can override this later
         */
	ds->phys_mii_mask = ds->enabled_port_mask;

	/*
         * If the CPU connects to this switch, set the switch tree
         * tagging protocol to the preferred tagging format of this
         * switch.
         */
	if (dst->cpu_switch == ds) {
		enum dsa_tag_protocol tag_protocol;

		tag_protocol = ops->get_tag_protocol(ds);
		dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
		if (IS_ERR(dst->tag_ops))
			return PTR_ERR(dst->tag_ops);

		dst->rcv = dst->tag_ops->rcv;
	}

	memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));

	/*
         * Do basic register setup.
         */
	ret = ops->setup(ds);
	if (ret < 0)
		return ret;

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

	if (ops->set_addr) {
		ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
		if (ret < 0)
			return ret;
	}

	if (!ds->slave_mii_bus && ops->phy_read) {
		ds->slave_mii_bus = devm_mdiobus_alloc(parent);
		if (!ds->slave_mii_bus)
			return -ENOMEM;
		dsa_slave_mii_bus_init(ds);

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

	/*
         * Create network devices for physical switch ports.
         */
	for (i = 0; i < ds->num_ports; i++) {
		ds->ports[i].dn = cd->port_dn[i];

		if (!(ds->enabled_port_mask & (1 << i)))
			continue;

		ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
		if (ret < 0)
			netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
				   index, i, cd->port_names[i], ret);
	}

	/* Perform configuration of the CPU and DSA ports */
	ret = dsa_cpu_dsa_setups(ds, parent);
	if (ret < 0)
		netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
			   index);

	ret = dsa_cpu_port_ethtool_setup(ds);
	if (ret)
		return ret;

	return 0;
}

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static struct dsa_switch *

dsa_switch_setup(struct dsa_switch_tree *dst, int index,
		 struct device *parent, struct device *host_dev)
{
	struct dsa_chip_data *cd = dst->pd->chip + index;
	const struct dsa_switch_ops *ops;
	struct dsa_switch *ds;
	int ret;
	const char *name;
	void *priv;

	/*
         * Probe for switch model.
         */
	ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
	if (!ops) {
		netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
			   index);
		return ERR_PTR(-EINVAL);
	}
	netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
		    index, name);


	/*
         * Allocate and initialise switch state.
         */
	ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
	if (!ds)
		return ERR_PTR(-ENOMEM);

	ds->dst = dst;
	ds->index = index;
	ds->cd = cd;
	ds->ops = ops;
	ds->priv = priv;

	ret = dsa_switch_setup_one(ds, parent);
	if (ret)
		return ERR_PTR(ret);

	return ds;
}

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void dsa_cpu_dsa_destroy(struct dsa_port *port)
{
	struct device_node *port_dn = port->dn;

	if (of_phy_is_fixed_link(port_dn))
		of_phy_deregister_fixed_link(port_dn);
}

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static void dsa_switch_destroy(struct dsa_switch *ds)
{
	int port;

	/* Destroy network devices for physical switch ports. */
	for (port = 0; port < ds->num_ports; port++) {
		if (!(ds->enabled_port_mask & (1 << port)))
			continue;

		if (!ds->ports[port].netdev)
			continue;

		dsa_slave_destroy(ds->ports[port].netdev);
	}

	/* Disable configuration of the CPU and DSA ports */
	for (port = 0; port < ds->num_ports; port++) {
		if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
			continue;
		dsa_cpu_dsa_destroy(&ds->ports[port]);

		/* Clearing a bit which is not set does no harm */
		ds->cpu_port_mask |= ~(1 << port);
		ds->dsa_port_mask |= ~(1 << port);
	}

	if (ds->slave_mii_bus && ds->ops->phy_read)
		mdiobus_unregister(ds->slave_mii_bus);

	dsa_switch_unregister_notifier(ds);
}

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#ifdef CONFIG_PM_SLEEP


int dsa_switch_suspend(struct dsa_switch *ds)
{
	int i, ret = 0;

	/* Suspend slave network devices */
	for (i = 0; i < ds->num_ports; i++) {
		if (!dsa_is_port_initialized(ds, i))
			continue;

		ret = dsa_slave_suspend(ds->ports[i].netdev);
		if (ret)
			return ret;
	}

	if (ds->ops->suspend)
		ret = ds->ops->suspend(ds);

	return ret;
}
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EXPORT_SYMBOL_GPL(dsa_switch_suspend);



int dsa_switch_resume(struct dsa_switch *ds)
{
	int i, ret = 0;

	if (ds->ops->resume)
		ret = ds->ops->resume(ds);

	if (ret)
		return ret;

	/* Resume slave network devices */
	for (i = 0; i < ds->num_ports; i++) {
		if (!dsa_is_port_initialized(ds, i))
			continue;

		ret = dsa_slave_resume(ds->ports[i].netdev);
		if (ret)
			return ret;
	}

	return 0;
}
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EXPORT_SYMBOL_GPL(dsa_switch_resume);
#endif

/* platform driver init and cleanup *****************************************/


static int dev_is_class(struct device *dev, void *class)
{
	if (dev->class != NULL && !strcmp(dev->class->name, class))
		return 1;

	return 0;
}

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static struct device *dev_find_class(struct device *parent, char *class)
{
	if (dev_is_class(parent, class)) {
		get_device(parent);
		return parent;
	}

	return device_find_child(parent, class, dev_is_class);
}

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struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
{
	struct device *d;

	d = dev_find_class(dev, "mdio_bus");
	if (d != NULL) {
		struct mii_bus *bus;

		bus = to_mii_bus(d);
		put_device(d);

		return bus;
	}

	return NULL;
}
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EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);



struct net_device *dsa_dev_to_net_device(struct device *dev)
{
	struct device *d;

	d = dev_find_class(dev, "net");
	if (d != NULL) {
		struct net_device *nd;

		nd = to_net_dev(d);
		dev_hold(nd);
		put_device(d);

		return nd;
	}

	return NULL;
}
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EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);

#ifdef CONFIG_OF


static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
					struct dsa_chip_data *cd,
					int chip_index, int port_index,
					struct device_node *link)
{
	const __be32 *reg;
	int link_sw_addr;
	struct device_node *parent_sw;
	int len;

	parent_sw = of_get_parent(link);
	if (!parent_sw)
		return -EINVAL;

	reg = of_get_property(parent_sw, "reg", &len);
	if (!reg || (len != sizeof(*reg) * 2))
		return -EINVAL;

	/*
         * Get the destination switch number from the second field of its 'reg'
         * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
         */
	link_sw_addr = be32_to_cpup(reg + 1);

	if (link_sw_addr >= pd->nr_chips)
		return -EINVAL;

	cd->rtable[link_sw_addr] = port_index;

	return 0;
}

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static int dsa_of_probe_links(struct dsa_platform_data *pd,
			      struct dsa_chip_data *cd,
			      int chip_index, int port_index,
			      struct device_node *port,
			      const char *port_name)
{
	struct device_node *link;
	int link_index;
	int ret;

	for (link_index = 0;; link_index++) {
		link = of_parse_phandle(port, "link", link_index);
		if (!link)
			break;

		if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
			ret = dsa_of_setup_routing_table(pd, cd, chip_index,
							 port_index, link);
			if (ret)
				return ret;
		}
	}
	return 0;
}

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100.00%
1
100.00%
Total
115
100.00%
1
100.00%



static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
{
	int i;
	int port_index;

	for (i = 0; i < pd->nr_chips; i++) {
		port_index = 0;
		while (port_index < DSA_MAX_PORTS) {
			kfree(pd->chip[i].port_names[port_index]);
			port_index++;
		}

		/* Drop our reference to the MDIO bus device */
		if (pd->chip[i].host_dev)
			put_device(pd->chip[i].host_dev);
	}
	kfree(pd->chip);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Fainelli
71
74.74%
2
66.67%
Russell King
24
25.26%
1
33.33%
Total
95
100.00%
3
100.00%



static int dsa_of_probe(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct device_node *child, *mdio, *ethernet, *port;
	struct mii_bus *mdio_bus, *mdio_bus_switch;
	struct net_device *ethernet_dev;
	struct dsa_platform_data *pd;
	struct dsa_chip_data *cd;
	const char *port_name;
	int chip_index, port_index;
	const unsigned int *sw_addr, *port_reg;
	u32 eeprom_len;
	int ret;

	mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
	if (!mdio)
		return -EINVAL;

	mdio_bus = of_mdio_find_bus(mdio);
	if (!mdio_bus)
		return -EPROBE_DEFER;

	ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
	if (!ethernet) {
		ret = -EINVAL;
		goto out_put_mdio;
	}

	ethernet_dev = of_find_net_device_by_node(ethernet);
	if (!ethernet_dev) {
		ret = -EPROBE_DEFER;
		goto out_put_mdio;
	}

	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
	if (!pd) {
		ret = -ENOMEM;
		goto out_put_ethernet;
	}

	dev->platform_data = pd;
	pd->of_netdev = ethernet_dev;
	pd->nr_chips = of_get_available_child_count(np);
	if (pd->nr_chips > DSA_MAX_SWITCHES)
		pd->nr_chips = DSA_MAX_SWITCHES;

	pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
			   GFP_KERNEL);
	if (!pd->chip) {
		ret = -ENOMEM;
		goto out_free;
	}

	chip_index = -1;
	for_each_available_child_of_node(np, child) {
		int i;

		chip_index++;
		cd = &pd->chip[chip_index];

		cd->of_node = child;

		/* Initialize the routing table */
		for (i = 0; i < DSA_MAX_SWITCHES; ++i)
			cd->rtable[i] = DSA_RTABLE_NONE;

		/* When assigning the host device, increment its refcount */
		cd->host_dev = get_device(&mdio_bus->dev);

		sw_addr = of_get_property(child, "reg", NULL);
		if (!sw_addr)
			continue;

		cd->sw_addr = be32_to_cpup(sw_addr);
		if (cd->sw_addr >= PHY_MAX_ADDR)
			continue;

		if (!of_property_read_u32(