drivers/net/dsa/dsa_loop.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Distributed Switch Architecture loopback driver
  *
  * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
  */

 #include <linux/platform_device.h>
 #include <linux/netdevice.h>
 #include <linux/phy.h>
 #include <linux/phy_fixed.h>
 #include <linux/export.h>
 #include <linux/ethtool.h>
 #include <linux/workqueue.h>
 #include <linux/module.h>
 #include <linux/if_bridge.h>
 #include <linux/dsa/loop.h>
 #include <net/dsa.h>

 #include "dsa_loop.h"

 static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
 	[DSA_LOOP_PHY_READ_OK]	= { "phy_read_ok", },
 	[DSA_LOOP_PHY_READ_ERR]	= { "phy_read_err", },
 	[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
 	[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
 };

 static struct phy_device *phydevs[PHY_MAX_ADDR];

 enum dsa_loop_devlink_resource_id {
 	DSA_LOOP_DEVLINK_PARAM_ID_VTU,
 };

 static u64 dsa_loop_devlink_vtu_get(void *priv)
 {
 	struct dsa_loop_priv *ps = priv;
 	unsigned int i, count = 0;
 	struct dsa_loop_vlan *vl;

 	for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
 		vl = &ps->vlans[i];
 		if (vl->members)
 			count++;
 	}

 	return count;
 }

 static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
 {
 	struct devlink_resource_size_params size_params;
 	struct dsa_loop_priv *ps = ds->priv;
 	int err;

 	devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
 					  ARRAY_SIZE(ps->vlans),
 					  1, DEVLINK_RESOURCE_UNIT_ENTRY);

 	err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
 					    DSA_LOOP_DEVLINK_PARAM_ID_VTU,
 					    DEVLINK_RESOURCE_ID_PARENT_TOP,
 					    &size_params);
 	if (err)
 		goto out;

 	dsa_devlink_resource_occ_get_register(ds,
 					      DSA_LOOP_DEVLINK_PARAM_ID_VTU,
 					      dsa_loop_devlink_vtu_get, ps);

 	return 0;

 out:
 	dsa_devlink_resources_unregister(ds);
 	return err;
 }

 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
 						   int port,
 						   enum dsa_tag_protocol mp)
 {
 	dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);

 	return DSA_TAG_PROTO_NONE;
 }

 static int dsa_loop_setup(struct dsa_switch *ds)
 {
 	struct dsa_loop_priv *ps = ds->priv;
 	unsigned int i;

 	for (i = 0; i < ds->num_ports; i++)
 		memcpy(ps->ports[i].mib, dsa_loop_mibs,
 		       sizeof(dsa_loop_mibs));

 	dev_dbg(ds->dev, "%s\n", __func__);

 	return dsa_loop_setup_devlink_resources(ds);
 }

 static void dsa_loop_teardown(struct dsa_switch *ds)
 {
 	dsa_devlink_resources_unregister(ds);
 }

 static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
 {
 	if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
 		return 0;

 	return __DSA_LOOP_CNT_MAX;
 }

 static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
 				 u32 stringset, uint8_t *data)
 {
 	struct dsa_loop_priv *ps = ds->priv;
 	unsigned int i;

 	if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
 		return;

 	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
 		memcpy(data + i * ETH_GSTRING_LEN,
 		       ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
 }

 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
 				       uint64_t *data)
 {
 	struct dsa_loop_priv *ps = ds->priv;
 	unsigned int i;

 	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
 		data[i] = ps->ports[port].mib[i].val;
 }

 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
 {
 	struct dsa_loop_priv *ps = ds->priv;
 	struct mii_bus *bus = ps->bus;
 	int ret;

 	ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
 	if (ret < 0)
 		ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
 	else
 		ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;

 	return ret;
 }

 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
 			      int regnum, u16 value)
 {
 	struct dsa_loop_priv *ps = ds->priv;
 	struct mii_bus *bus = ps->bus;
 	int ret;

 	ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
 	if (ret < 0)
 		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
 	else
 		ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;

 	return ret;
 }

 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
 				     struct dsa_bridge bridge,
 				     bool *tx_fwd_offload,
 				     struct netlink_ext_ack *extack)
 {
 	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 		__func__, port, bridge.dev->name);

 	return 0;
 }

 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
 				       struct dsa_bridge bridge)
 {
 	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 		__func__, port, bridge.dev->name);
 }

 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
 					u8 state)
 {
 	dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
 		__func__, port, state);
 }

 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
 					bool vlan_filtering,
 					struct netlink_ext_ack *extack)
 {
 	dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
 		__func__, port, vlan_filtering);

 	return 0;
 }

 static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
 				  const struct switchdev_obj_port_vlan *vlan,
 				  struct netlink_ext_ack *extack)
 {
 	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
 	struct dsa_loop_priv *ps = ds->priv;
 	struct mii_bus *bus = ps->bus;
 	struct dsa_loop_vlan *vl;

 	if (vlan->vid >= ARRAY_SIZE(ps->vlans))
 		return -ERANGE;

 	/* Just do a sleeping operation to make lockdep checks effective */
 	mdiobus_read(bus, ps->port_base + port, MII_BMSR);

 	vl = &ps->vlans[vlan->vid];

 	vl->members |= BIT(port);
 	if (untagged)
 		vl->untagged |= BIT(port);
 	else
 		vl->untagged &= ~BIT(port);

 	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 		__func__, port, vlan->vid, untagged ? "un" : "", pvid);

 	if (pvid)
 		ps->ports[port].pvid = vlan->vid;

 	return 0;
 }

 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
 				  const struct switchdev_obj_port_vlan *vlan)
 {
 	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 	struct dsa_loop_priv *ps = ds->priv;
 	u16 pvid = ps->ports[port].pvid;
 	struct mii_bus *bus = ps->bus;
 	struct dsa_loop_vlan *vl;

 	/* Just do a sleeping operation to make lockdep checks effective */
 	mdiobus_read(bus, ps->port_base + port, MII_BMSR);

 	vl = &ps->vlans[vlan->vid];

 	vl->members &= ~BIT(port);
 	if (untagged)
 		vl->untagged &= ~BIT(port);

 	if (pvid == vlan->vid)
 		pvid = 1;

 	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 		__func__, port, vlan->vid, untagged ? "un" : "", pvid);
 	ps->ports[port].pvid = pvid;

 	return 0;
 }

 static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
 				    int new_mtu)
 {
 	struct dsa_loop_priv *priv = ds->priv;

 	priv->ports[port].mtu = new_mtu;

 	return 0;
 }

 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
 {
 	return ETH_MAX_MTU;
 }

 static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
 				      struct phylink_config *config)
 {
 	bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);
 	__clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
 	config->mac_capabilities = ~0;
 }

 static const struct dsa_switch_ops dsa_loop_driver = {
 	.get_tag_protocol	= dsa_loop_get_protocol,
 	.setup			= dsa_loop_setup,
 	.teardown		= dsa_loop_teardown,
 	.get_strings		= dsa_loop_get_strings,
 	.get_ethtool_stats	= dsa_loop_get_ethtool_stats,
 	.get_sset_count		= dsa_loop_get_sset_count,
 	.get_ethtool_phy_stats	= dsa_loop_get_ethtool_stats,
 	.phy_read		= dsa_loop_phy_read,
 	.phy_write		= dsa_loop_phy_write,
 	.port_bridge_join	= dsa_loop_port_bridge_join,
 	.port_bridge_leave	= dsa_loop_port_bridge_leave,
 	.port_stp_state_set	= dsa_loop_port_stp_state_set,
 	.port_vlan_filtering	= dsa_loop_port_vlan_filtering,
 	.port_vlan_add		= dsa_loop_port_vlan_add,
 	.port_vlan_del		= dsa_loop_port_vlan_del,
 	.port_change_mtu	= dsa_loop_port_change_mtu,
 	.port_max_mtu		= dsa_loop_port_max_mtu,
 	.phylink_get_caps	= dsa_loop_phylink_get_caps,
 };

 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
 {
 	struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
 	struct dsa_loop_priv *ps;
 	struct dsa_switch *ds;
 	int ret;

 	if (!pdata)
 		return -ENODEV;

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

 	ds->dev = &mdiodev->dev;
 	ds->num_ports = DSA_LOOP_NUM_PORTS;

 	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
 	if (!ps)
 		return -ENOMEM;

 	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
 	if (!ps->netdev)
 		return -EPROBE_DEFER;

 	pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;

 	ds->dev = &mdiodev->dev;
 	ds->ops = &dsa_loop_driver;
 	ds->priv = ps;
 	ps->bus = mdiodev->bus;

 	dev_set_drvdata(&mdiodev->dev, ds);

 	ret = dsa_register_switch(ds);
 	if (!ret)
 		dev_info(&mdiodev->dev, "%s: 0x%0x\n",
 			 pdata->name, pdata->enabled_ports);

 	return ret;
 }

 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
 {
 	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 	struct dsa_loop_priv *ps;

 	if (!ds)
 		return;

 	ps = ds->priv;

 	dsa_unregister_switch(ds);
 	dev_put(ps->netdev);
 }

 static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
 {
 	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);

 	if (!ds)
 		return;

 	dsa_switch_shutdown(ds);

 	dev_set_drvdata(&mdiodev->dev, NULL);
 }

 static struct mdio_driver dsa_loop_drv = {
 	.mdiodrv.driver	= {
 		.name	= "dsa-loop",
 	},
 	.probe	= dsa_loop_drv_probe,
 	.remove	= dsa_loop_drv_remove,
 	.shutdown = dsa_loop_drv_shutdown,
 };

 #define NUM_FIXED_PHYS	(DSA_LOOP_NUM_PORTS - 2)

 static void dsa_loop_phydevs_unregister(void)
 {
 	unsigned int i;

 	for (i = 0; i < NUM_FIXED_PHYS; i++)
 		if (!IS_ERR(phydevs[i])) {
 			fixed_phy_unregister(phydevs[i]);
 			phy_device_free(phydevs[i]);
 		}
 }

 static int __init dsa_loop_init(void)
 {
 	struct fixed_phy_status status = {
 		.link = 1,
 		.speed = SPEED_100,
 		.duplex = DUPLEX_FULL,
 	};
 	unsigned int i, ret;

 	for (i = 0; i < NUM_FIXED_PHYS; i++)
 		phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);

 	ret = mdio_driver_register(&dsa_loop_drv);
 	if (ret)
 		dsa_loop_phydevs_unregister();

 	return ret;
 }
 module_init(dsa_loop_init);

 static void __exit dsa_loop_exit(void)
 {
 	mdio_driver_unregister(&dsa_loop_drv);
 	dsa_loop_phydevs_unregister();
 }
 module_exit(dsa_loop_exit);

 MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Florian Fainelli");
 MODULE_DESCRIPTION("DSA loopback driver");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Distributed Switch Architecture loopback driver
	*
	* Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
	*/

	#include <linux/platform_device.h>
	#include <linux/netdevice.h>
	#include <linux/phy.h>
	#include <linux/phy_fixed.h>
	#include <linux/export.h>
	#include <linux/ethtool.h>
	#include <linux/workqueue.h>
	#include <linux/module.h>
	#include <linux/if_bridge.h>
	#include <linux/dsa/loop.h>
	#include <net/dsa.h>

	#include "dsa_loop.h"

	static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
	[DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
	[DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
	[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
	[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
	};

	static struct phy_device *phydevs[PHY_MAX_ADDR];

	enum dsa_loop_devlink_resource_id {
	DSA_LOOP_DEVLINK_PARAM_ID_VTU,
	};

	static u64 dsa_loop_devlink_vtu_get(void *priv)
	{
	struct dsa_loop_priv *ps = priv;
	unsigned int i, count = 0;
	struct dsa_loop_vlan *vl;

	for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
	vl = &ps->vlans[i];
	if (vl->members)
	count++;
	}

	return count;
	}

	static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
	{
	struct devlink_resource_size_params size_params;
	struct dsa_loop_priv *ps = ds->priv;
	int err;

	devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
	ARRAY_SIZE(ps->vlans),
	1, DEVLINK_RESOURCE_UNIT_ENTRY);

	err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
	DSA_LOOP_DEVLINK_PARAM_ID_VTU,
	DEVLINK_RESOURCE_ID_PARENT_TOP,
	&size_params);
	if (err)
	goto out;

	dsa_devlink_resource_occ_get_register(ds,
	DSA_LOOP_DEVLINK_PARAM_ID_VTU,
	dsa_loop_devlink_vtu_get, ps);

	return 0;

	out:
	dsa_devlink_resources_unregister(ds);
	return err;
	}

	static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
	int port,
	enum dsa_tag_protocol mp)
	{
	dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);

	return DSA_TAG_PROTO_NONE;
	}

	static int dsa_loop_setup(struct dsa_switch *ds)
	{
	struct dsa_loop_priv *ps = ds->priv;
	unsigned int i;

	for (i = 0; i < ds->num_ports; i++)
	memcpy(ps->ports[i].mib, dsa_loop_mibs,
	sizeof(dsa_loop_mibs));

	dev_dbg(ds->dev, "%s\n", __func__);

	return dsa_loop_setup_devlink_resources(ds);
	}

	static void dsa_loop_teardown(struct dsa_switch *ds)
	{
	dsa_devlink_resources_unregister(ds);
	}

	static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
	{
	if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
	return 0;

	return __DSA_LOOP_CNT_MAX;
	}

	static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
	u32 stringset, uint8_t *data)
	{
	struct dsa_loop_priv *ps = ds->priv;
	unsigned int i;

	if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
	return;

	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
	memcpy(data + i * ETH_GSTRING_LEN,
	ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
	}

	static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
	uint64_t *data)
	{
	struct dsa_loop_priv *ps = ds->priv;
	unsigned int i;

	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
	data[i] = ps->ports[port].mib[i].val;
	}

	static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
	{
	struct dsa_loop_priv *ps = ds->priv;
	struct mii_bus *bus = ps->bus;
	int ret;

	ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
	if (ret < 0)
	ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
	else
	ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;

	return ret;
	}

	static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
	int regnum, u16 value)
	{
	struct dsa_loop_priv *ps = ds->priv;
	struct mii_bus *bus = ps->bus;
	int ret;

	ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
	if (ret < 0)
	ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
	else
	ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;

	return ret;
	}

	static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
	struct dsa_bridge bridge,
	bool *tx_fwd_offload,
	struct netlink_ext_ack *extack)
	{
	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
	__func__, port, bridge.dev->name);

	return 0;
	}

	static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
	struct dsa_bridge bridge)
	{
	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
	__func__, port, bridge.dev->name);
	}

	static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
	u8 state)
	{
	dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
	__func__, port, state);
	}

	static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
	bool vlan_filtering,
	struct netlink_ext_ack *extack)
	{
	dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
	__func__, port, vlan_filtering);

	return 0;
	}

	static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
	const struct switchdev_obj_port_vlan *vlan,
	struct netlink_ext_ack *extack)
	{
	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
	struct dsa_loop_priv *ps = ds->priv;
	struct mii_bus *bus = ps->bus;
	struct dsa_loop_vlan *vl;

	if (vlan->vid >= ARRAY_SIZE(ps->vlans))
	return -ERANGE;

	/* Just do a sleeping operation to make lockdep checks effective */
	mdiobus_read(bus, ps->port_base + port, MII_BMSR);

	vl = &ps->vlans[vlan->vid];

	vl->members \|= BIT(port);
	if (untagged)
	vl->untagged \|= BIT(port);
	else
	vl->untagged &= ~BIT(port);

	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
	__func__, port, vlan->vid, untagged ? "un" : "", pvid);

	if (pvid)
	ps->ports[port].pvid = vlan->vid;

	return 0;
	}

	static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
	const struct switchdev_obj_port_vlan *vlan)
	{
	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
	struct dsa_loop_priv *ps = ds->priv;
	u16 pvid = ps->ports[port].pvid;
	struct mii_bus *bus = ps->bus;
	struct dsa_loop_vlan *vl;

	/* Just do a sleeping operation to make lockdep checks effective */
	mdiobus_read(bus, ps->port_base + port, MII_BMSR);

	vl = &ps->vlans[vlan->vid];

	vl->members &= ~BIT(port);
	if (untagged)
	vl->untagged &= ~BIT(port);

	if (pvid == vlan->vid)
	pvid = 1;

	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
	__func__, port, vlan->vid, untagged ? "un" : "", pvid);
	ps->ports[port].pvid = pvid;

	return 0;
	}

	static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
	int new_mtu)
	{
	struct dsa_loop_priv *priv = ds->priv;

	priv->ports[port].mtu = new_mtu;

	return 0;
	}

	static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
	{
	return ETH_MAX_MTU;
	}

	static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
	struct phylink_config *config)
	{
	bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);
	__clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
	config->mac_capabilities = ~0;
	}

	static const struct dsa_switch_ops dsa_loop_driver = {
	.get_tag_protocol = dsa_loop_get_protocol,
	.setup = dsa_loop_setup,
	.teardown = dsa_loop_teardown,
	.get_strings = dsa_loop_get_strings,
	.get_ethtool_stats = dsa_loop_get_ethtool_stats,
	.get_sset_count = dsa_loop_get_sset_count,
	.get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
	.phy_read = dsa_loop_phy_read,
	.phy_write = dsa_loop_phy_write,
	.port_bridge_join = dsa_loop_port_bridge_join,
	.port_bridge_leave = dsa_loop_port_bridge_leave,
	.port_stp_state_set = dsa_loop_port_stp_state_set,
	.port_vlan_filtering = dsa_loop_port_vlan_filtering,
	.port_vlan_add = dsa_loop_port_vlan_add,
	.port_vlan_del = dsa_loop_port_vlan_del,
	.port_change_mtu = dsa_loop_port_change_mtu,
	.port_max_mtu = dsa_loop_port_max_mtu,
	.phylink_get_caps = dsa_loop_phylink_get_caps,
	};

	static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
	{
	struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
	struct dsa_loop_priv *ps;
	struct dsa_switch *ds;
	int ret;

	if (!pdata)
	return -ENODEV;

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

	ds->dev = &mdiodev->dev;
	ds->num_ports = DSA_LOOP_NUM_PORTS;

	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
	if (!ps)
	return -ENOMEM;

	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
	if (!ps->netdev)
	return -EPROBE_DEFER;

	pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;

	ds->dev = &mdiodev->dev;
	ds->ops = &dsa_loop_driver;
	ds->priv = ps;
	ps->bus = mdiodev->bus;

	dev_set_drvdata(&mdiodev->dev, ds);

	ret = dsa_register_switch(ds);
	if (!ret)
	dev_info(&mdiodev->dev, "%s: 0x%0x\n",
	pdata->name, pdata->enabled_ports);

	return ret;
	}

	static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
	{
	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
	struct dsa_loop_priv *ps;

	if (!ds)
	return;

	ps = ds->priv;

	dsa_unregister_switch(ds);
	dev_put(ps->netdev);
	}

	static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
	{
	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);

	if (!ds)
	return;

	dsa_switch_shutdown(ds);

	dev_set_drvdata(&mdiodev->dev, NULL);
	}

	static struct mdio_driver dsa_loop_drv = {
	.mdiodrv.driver = {
	.name = "dsa-loop",
	},
	.probe = dsa_loop_drv_probe,
	.remove = dsa_loop_drv_remove,
	.shutdown = dsa_loop_drv_shutdown,
	};

	#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)

	static void dsa_loop_phydevs_unregister(void)
	{
	unsigned int i;

	for (i = 0; i < NUM_FIXED_PHYS; i++)
	if (!IS_ERR(phydevs[i])) {
	fixed_phy_unregister(phydevs[i]);
	phy_device_free(phydevs[i]);
	}
	}

	static int __init dsa_loop_init(void)
	{
	struct fixed_phy_status status = {
	.link = 1,
	.speed = SPEED_100,
	.duplex = DUPLEX_FULL,
	};
	unsigned int i, ret;

	for (i = 0; i < NUM_FIXED_PHYS; i++)
	phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);

	ret = mdio_driver_register(&dsa_loop_drv);
	if (ret)
	dsa_loop_phydevs_unregister();

	return ret;
	}
	module_init(dsa_loop_init);

	static void __exit dsa_loop_exit(void)
	{
	mdio_driver_unregister(&dsa_loop_drv);
	dsa_loop_phydevs_unregister();
	}
	module_exit(dsa_loop_exit);

	MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Florian Fainelli");
	MODULE_DESCRIPTION("DSA loopback driver");