drivers/net/dsa/dsa_loop.c - kernel/msm-4.19 - Gitiles

 /*
  * Distributed Switch Architecture loopback driver
  *
  * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
  *
  * 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/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\n", __func__);

 	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)
 {
 	return __DSA_LOOP_CNT_MAX;
 }

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

 	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;

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

 	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;

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

 	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\n", __func__);

 	return 0;
 }

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

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

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

 	return 0;
 }

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

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

 	/* 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,
 				   struct switchdev_trans *trans)
 {
 	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;

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

 	/* 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);
 	}

 	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;

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

 	/* 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;
 	}
 	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,
 	.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, -1, 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");
	/*
	* Distributed Switch Architecture loopback driver
	*
	* Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>
	*
	* 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/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\n", __func__);

	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)
	{
	return __DSA_LOOP_CNT_MAX;
	}

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

	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;

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

	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;

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

	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\n", __func__);

	return 0;
	}

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

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

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

	return 0;
	}

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

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

	/* 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,
	struct switchdev_trans *trans)
	{
	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;

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

	/* 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);
	}

	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;

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

	/* 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;
	}
	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,
	.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, -1, 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");