[mirror_ubuntu-jammy-kernel.git] / drivers / net / dsa / dsa_loop.c

// 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 <net/dsa.h>

#include "dsa_loop.h"

struct dsa_loop_vlan {
	u16 members;
	u16 untagged;
};

struct dsa_loop_mib_entry {
	char name[ETH_GSTRING_LEN];
	unsigned long val;
};

enum dsa_loop_mib_counters {
	DSA_LOOP_PHY_READ_OK,
	DSA_LOOP_PHY_READ_ERR,
	DSA_LOOP_PHY_WRITE_OK,
	DSA_LOOP_PHY_WRITE_ERR,
	__DSA_LOOP_CNT_MAX,
};

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", },
};

struct dsa_loop_port {
	struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX];
};

#define DSA_LOOP_VLANS	5

struct dsa_loop_priv {
	struct mii_bus	*bus;
	unsigned int	port_base;
	struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
	struct net_device *netdev;
	struct dsa_loop_port ports[DSA_MAX_PORTS];
	u16 pvid;
};

static struct phy_device *phydevs[PHY_MAX_ADDR];

static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
						   int port)
{
	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 0;
}

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 net_device *bridge)
{
	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
		__func__, port, bridge->name);

	return 0;
}

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

	return 0;
}

static int
dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
			   const struct switchdev_obj_port_vlan *vlan)
{
	struct dsa_loop_priv *ps = ds->priv;
	struct mii_bus *bus = ps->bus;

	dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d",
		__func__, port, vlan->vid_begin, vlan->vid_end);

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

	if (vlan->vid_end > DSA_LOOP_VLANS)
		return -ERANGE;

	return 0;
}

static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
				   const struct switchdev_obj_port_vlan *vlan)
{
	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;
	u16 vid;

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

	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
		vl = &ps->vlans[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, vid, untagged ? "un" : "", pvid);
	}

	if (pvid)
		ps->pvid = vid;
}

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;
	struct mii_bus *bus = ps->bus;
	struct dsa_loop_vlan *vl;
	u16 vid, pvid = ps->pvid;

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

	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
		vl = &ps->vlans[vid];

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

		if (pvid == vid)
			pvid = 1;

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

	return 0;
}

static const struct dsa_switch_ops dsa_loop_driver = {
	.get_tag_protocol	= dsa_loop_get_protocol,
	.setup			= dsa_loop_setup,
	.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_prepare	= dsa_loop_port_vlan_prepare,
	.port_vlan_add		= dsa_loop_port_vlan_add,
	.port_vlan_del		= dsa_loop_port_vlan_del,
};

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;

	if (!pdata)
		return -ENODEV;

	dev_info(&mdiodev->dev, "%s: 0x%0x\n",
		 pdata->name, pdata->enabled_ports);

	ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
	if (!ds)
		return -ENOMEM;

	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);

	return dsa_register_switch(ds);
}

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

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

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

#define NUM_FIXED_PHYS	(DSA_LOOP_NUM_PORTS - 2)

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

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

	return mdio_driver_register(&dsa_loop_drv);
}
module_init(dsa_loop_init);

static void __exit dsa_loop_exit(void)
{
	unsigned int i;

	mdio_driver_unregister(&dsa_loop_drv);
	for (i = 0; i < NUM_FIXED_PHYS; i++)
		if (!IS_ERR(phydevs[i]))
			fixed_phy_unregister(phydevs[i]);
}
module_exit(dsa_loop_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Fainelli");
MODULE_DESCRIPTION("DSA loopback driver");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
98cd1552 FF	2	/*
	3	* Distributed Switch Architecture loopback driver
	4	*
	5	* Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
98cd1552 FF	6	*/
	7
	8	#include <linux/platform_device.h>
	9	#include <linux/netdevice.h>
	10	#include <linux/phy.h>
	11	#include <linux/phy_fixed.h>
	12	#include <linux/export.h>
484c0172	13	#include <linux/ethtool.h>
98cd1552 FF	14	#include <linux/workqueue.h>
	15	#include <linux/module.h>
	16	#include <linux/if_bridge.h>
98cd1552 FF	17	#include <net/dsa.h>
	18
	19	#include "dsa_loop.h"
	20
	21	struct dsa_loop_vlan {
	22	u16 members;
	23	u16 untagged;
	24	};
	25
484c0172 FF	26	struct dsa_loop_mib_entry {
	27	char name[ETH_GSTRING_LEN];
	28	unsigned long val;
	29	};
	30
	31	enum dsa_loop_mib_counters {
	32	DSA_LOOP_PHY_READ_OK,
	33	DSA_LOOP_PHY_READ_ERR,
	34	DSA_LOOP_PHY_WRITE_OK,
	35	DSA_LOOP_PHY_WRITE_ERR,
	36	__DSA_LOOP_CNT_MAX,
	37	};
	38
	39	static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
	40	[DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
	41	[DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
	42	[DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
	43	[DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
	44	};
	45
	46	struct dsa_loop_port {
	47	struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX];
	48	};
	49
98cd1552 FF	50	#define DSA_LOOP_VLANS 5
	51
	52	struct dsa_loop_priv {
	53	struct mii_bus *bus;
	54	unsigned int port_base;
	55	struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
	56	struct net_device *netdev;
484c0172	57	struct dsa_loop_port ports[DSA_MAX_PORTS];
98cd1552 FF	58	u16 pvid;
	59	};
	60
	61	static struct phy_device *phydevs[PHY_MAX_ADDR];
	62
5ed4e3eb FF	63	static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
5ed4e3eb FF	64	int port)
98cd1552	65	{
e52cde71	66	dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
98cd1552 FF	67
	68	return DSA_TAG_PROTO_NONE;
	69	}
	70
	71	static int dsa_loop_setup(struct dsa_switch *ds)
	72	{
484c0172 FF	73	struct dsa_loop_priv *ps = ds->priv;
	74	unsigned int i;
	75
	76	for (i = 0; i < ds->num_ports; i++)
	77	memcpy(ps->ports[i].mib, dsa_loop_mibs,
	78	sizeof(dsa_loop_mibs));
	79
98cd1552 FF	80	dev_dbg(ds->dev, "%s\n", __func__);
	81
	82	return 0;
	83	}
	84
89f09048	85	static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
484c0172	86	{
96cbddcd	87	if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
89f09048 FF	88	return 0;
89f09048 FF	89
484c0172 FF	90	return __DSA_LOOP_CNT_MAX;
	91	}
	92
89f09048 FF	93	static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
89f09048 FF	94	u32 stringset, uint8_t *data)
484c0172 FF	95	{
	96	struct dsa_loop_priv *ps = ds->priv;
	97	unsigned int i;
	98
96cbddcd	99	if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
89f09048 FF	100	return;
89f09048 FF	101
484c0172 FF	102	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
	103	memcpy(data + i * ETH_GSTRING_LEN,
	104	ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
	105	}
	106
	107	static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
	108	uint64_t *data)
	109	{
	110	struct dsa_loop_priv *ps = ds->priv;
	111	unsigned int i;
	112
	113	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
	114	data[i] = ps->ports[port].mib[i].val;
	115	}
	116
98cd1552 FF	117	static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
	118	{
	119	struct dsa_loop_priv *ps = ds->priv;
	120	struct mii_bus *bus = ps->bus;
484c0172	121	int ret;
98cd1552	122
484c0172 FF	123	ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
	124	if (ret < 0)
	125	ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
	126	else
	127	ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
	128
	129	return ret;
98cd1552 FF	130	}
	131
	132	static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
	133	int regnum, u16 value)
	134	{
	135	struct dsa_loop_priv *ps = ds->priv;
	136	struct mii_bus *bus = ps->bus;
484c0172	137	int ret;
98cd1552	138
484c0172 FF	139	ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
	140	if (ret < 0)
	141	ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
	142	else
	143	ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
	144
	145	return ret;
98cd1552 FF	146	}
	147
	148	static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
	149	struct net_device *bridge)
	150	{
e52cde71 FF	151	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
e52cde71 FF	152	__func__, port, bridge->name);
98cd1552 FF	153
	154	return 0;
	155	}
	156
	157	static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
	158	struct net_device *bridge)
	159	{
e52cde71 FF	160	dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
e52cde71 FF	161	__func__, port, bridge->name);
98cd1552 FF	162	}
	163
	164	static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
	165	u8 state)
	166	{
e52cde71 FF	167	dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
e52cde71 FF	168	__func__, port, state);
98cd1552 FF	169	}
	170
	171	static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
	172	bool vlan_filtering)
	173	{
e52cde71 FF	174	dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
e52cde71 FF	175	__func__, port, vlan_filtering);
98cd1552 FF	176
	177	return 0;
	178	}
	179
80e02360 VD	180	static int
	181	dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
	182	const struct switchdev_obj_port_vlan *vlan)
98cd1552 FF	183	{
	184	struct dsa_loop_priv *ps = ds->priv;
	185	struct mii_bus *bus = ps->bus;
	186
e52cde71 FF	187	dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d",
e52cde71 FF	188	__func__, port, vlan->vid_begin, vlan->vid_end);
98cd1552 FF	189
	190	/* Just do a sleeping operation to make lockdep checks effective */
	191	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
	192
	193	if (vlan->vid_end > DSA_LOOP_VLANS)
	194	return -ERANGE;
	195
	196	return 0;
	197	}
	198
	199	static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
80e02360	200	const struct switchdev_obj_port_vlan *vlan)
98cd1552 FF	201	{
	202	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
	203	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
	204	struct dsa_loop_priv *ps = ds->priv;
	205	struct mii_bus *bus = ps->bus;
	206	struct dsa_loop_vlan *vl;
	207	u16 vid;
	208
98cd1552 FF	209	/* Just do a sleeping operation to make lockdep checks effective */
	210	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
	211
	212	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
	213	vl = &ps->vlans[vid];
	214
	215	vl->members \|= BIT(port);
	216	if (untagged)
	217	vl->untagged \|= BIT(port);
	218	else
	219	vl->untagged &= ~BIT(port);
e52cde71 FF	220
	221	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
	222	__func__, port, vid, untagged ? "un" : "", pvid);
98cd1552 FF	223	}
	224
	225	if (pvid)
	226	ps->pvid = vid;
	227	}
	228
	229	static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
	230	const struct switchdev_obj_port_vlan *vlan)
	231	{
	232	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
	233	struct dsa_loop_priv *ps = ds->priv;
	234	struct mii_bus *bus = ps->bus;
	235	struct dsa_loop_vlan *vl;
5865ccce	236	u16 vid, pvid = ps->pvid;
98cd1552	237
98cd1552 FF	238	/* Just do a sleeping operation to make lockdep checks effective */
	239	mdiobus_read(bus, ps->port_base + port, MII_BMSR);
	240
	241	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
	242	vl = &ps->vlans[vid];
	243
	244	vl->members &= ~BIT(port);
	245	if (untagged)
	246	vl->untagged &= ~BIT(port);
	247
	248	if (pvid == vid)
	249	pvid = 1;
e52cde71 FF	250
	251	dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
	252	__func__, port, vid, untagged ? "un" : "", pvid);
98cd1552 FF	253	}
	254	ps->pvid = pvid;
	255
	256	return 0;
	257	}
	258
d78d6776	259	static const struct dsa_switch_ops dsa_loop_driver = {
98cd1552 FF	260	.get_tag_protocol = dsa_loop_get_protocol,
98cd1552 FF	261	.setup = dsa_loop_setup,
484c0172 FF	262	.get_strings = dsa_loop_get_strings,
	263	.get_ethtool_stats = dsa_loop_get_ethtool_stats,
	264	.get_sset_count = dsa_loop_get_sset_count,
96cbddcd	265	.get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
98cd1552 FF	266	.phy_read = dsa_loop_phy_read,
	267	.phy_write = dsa_loop_phy_write,
	268	.port_bridge_join = dsa_loop_port_bridge_join,
	269	.port_bridge_leave = dsa_loop_port_bridge_leave,
	270	.port_stp_state_set = dsa_loop_port_stp_state_set,
	271	.port_vlan_filtering = dsa_loop_port_vlan_filtering,
	272	.port_vlan_prepare = dsa_loop_port_vlan_prepare,
	273	.port_vlan_add = dsa_loop_port_vlan_add,
	274	.port_vlan_del = dsa_loop_port_vlan_del,
98cd1552 FF	275	};
	276
	277	static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
	278	{
	279	struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
	280	struct dsa_loop_priv *ps;
	281	struct dsa_switch *ds;
	282
	283	if (!pdata)
	284	return -ENODEV;
	285
	286	dev_info(&mdiodev->dev, "%s: 0x%0x\n",
	287	pdata->name, pdata->enabled_ports);
	288
	289	ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
	290	if (!ds)
	291	return -ENOMEM;
	292
	293	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
8ce7aaaa CJ	294	if (!ps)
	295	return -ENOMEM;
	296
98cd1552 FF	297	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
	298	if (!ps->netdev)
	299	return -EPROBE_DEFER;
	300
	301	pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
	302
	303	ds->dev = &mdiodev->dev;
	304	ds->ops = &dsa_loop_driver;
	305	ds->priv = ps;
	306	ps->bus = mdiodev->bus;
	307
	308	dev_set_drvdata(&mdiodev->dev, ds);
	309
23c9ee49	310	return dsa_register_switch(ds);
98cd1552 FF	311	}
	312
	313	static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
	314	{
	315	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
	316	struct dsa_loop_priv *ps = ds->priv;
	317
	318	dsa_unregister_switch(ds);
	319	dev_put(ps->netdev);
	320	}
	321
	322	static struct mdio_driver dsa_loop_drv = {
	323	.mdiodrv.driver = {
	324	.name = "dsa-loop",
	325	},
	326	.probe = dsa_loop_drv_probe,
	327	.remove = dsa_loop_drv_remove,
	328	};
	329
	330	#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
	331
98cd1552 FF	332	static int __init dsa_loop_init(void)
	333	{
	334	struct fixed_phy_status status = {
	335	.link = 1,
	336	.speed = SPEED_100,
	337	.duplex = DUPLEX_FULL,
	338	};
	339	unsigned int i;
	340
	341	for (i = 0; i < NUM_FIXED_PHYS; i++)
5468e82f	342	phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
98cd1552 FF	343
	344	return mdio_driver_register(&dsa_loop_drv);
	345	}
	346	module_init(dsa_loop_init);
	347
	348	static void __exit dsa_loop_exit(void)
	349	{
3407dc8e FF	350	unsigned int i;
3407dc8e FF	351
98cd1552	352	mdio_driver_unregister(&dsa_loop_drv);
3407dc8e	353	for (i = 0; i < NUM_FIXED_PHYS; i++)
6d9c153a	354	if (!IS_ERR(phydevs[i]))
3407dc8e	355	fixed_phy_unregister(phydevs[i]);
98cd1552 FF	356	}
	357	module_exit(dsa_loop_exit);
	358
	359	MODULE_LICENSE("GPL");
	360	MODULE_AUTHOR("Florian Fainelli");
	361	MODULE_DESCRIPTION("DSA loopback driver");