net/dsa/port.c - kernel/msm-5.4 - Gitiles

 /*
  * Handling of a single switch port
  *
  * Copyright (c) 2017 Savoir-faire Linux Inc.
  *	Vivien Didelot <vivien.didelot@savoirfairelinux.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/if_bridge.h>
 #include <linux/notifier.h>
 #include <linux/of_mdio.h>
 #include <linux/of_net.h>

 #include "dsa_priv.h"

 static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
 {
 	struct raw_notifier_head *nh = &dp->ds->dst->nh;
 	int err;

 	err = raw_notifier_call_chain(nh, e, v);

 	return notifier_to_errno(err);
 }

 int dsa_port_set_state(struct dsa_port *dp, u8 state,
 		       struct switchdev_trans *trans)
 {
 	struct dsa_switch *ds = dp->ds;
 	int port = dp->index;

 	if (switchdev_trans_ph_prepare(trans))
 		return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;

 	if (ds->ops->port_stp_state_set)
 		ds->ops->port_stp_state_set(ds, port, state);

 	if (ds->ops->port_fast_age) {
 		/* Fast age FDB entries or flush appropriate forwarding database
 		 * for the given port, if we are moving it from Learning or
 		 * Forwarding state, to Disabled or Blocking or Listening state.
 		 */

 		if ((dp->stp_state == BR_STATE_LEARNING ||
 		     dp->stp_state == BR_STATE_FORWARDING) &&
 		    (state == BR_STATE_DISABLED ||
 		     state == BR_STATE_BLOCKING ||
 		     state == BR_STATE_LISTENING))
 			ds->ops->port_fast_age(ds, port);
 	}

 	dp->stp_state = state;

 	return 0;
 }

 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
 {
 	int err;

 	err = dsa_port_set_state(dp, state, NULL);
 	if (err)
 		pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
 }

 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
 {
 	u8 stp_state = dp->bridge_dev ? BR_STATE_BLOCKING : BR_STATE_FORWARDING;
 	struct dsa_switch *ds = dp->ds;
 	int port = dp->index;
 	int err;

 	if (ds->ops->port_enable) {
 		err = ds->ops->port_enable(ds, port, phy);
 		if (err)
 			return err;
 	}

 	dsa_port_set_state_now(dp, stp_state);

 	return 0;
 }

 void dsa_port_disable(struct dsa_port *dp, struct phy_device *phy)
 {
 	struct dsa_switch *ds = dp->ds;
 	int port = dp->index;

 	dsa_port_set_state_now(dp, BR_STATE_DISABLED);

 	if (ds->ops->port_disable)
 		ds->ops->port_disable(ds, port, phy);
 }

 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
 {
 	struct dsa_notifier_bridge_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.br = br,
 	};
 	int err;

 	/* Here the port is already bridged. Reflect the current configuration
 	 * so that drivers can program their chips accordingly.
 	 */
 	dp->bridge_dev = br;

 	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);

 	/* The bridging is rolled back on error */
 	if (err)
 		dp->bridge_dev = NULL;

 	return err;
 }

 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 {
 	struct dsa_notifier_bridge_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.br = br,
 	};
 	int err;

 	/* Here the port is already unbridged. Reflect the current configuration
 	 * so that drivers can program their chips accordingly.
 	 */
 	dp->bridge_dev = NULL;

 	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 	if (err)
 		pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");

 	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
 	 */
 	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 }

 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
 			    struct switchdev_trans *trans)
 {
 	struct dsa_switch *ds = dp->ds;

 	/* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 	if (switchdev_trans_ph_prepare(trans))
 		return 0;

 	if (ds->ops->port_vlan_filtering)
 		return ds->ops->port_vlan_filtering(ds, dp->index,
 						    vlan_filtering);

 	return 0;
 }

 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
 			 struct switchdev_trans *trans)
 {
 	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
 	unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 	struct dsa_notifier_ageing_time_info info = {
 		.ageing_time = ageing_time,
 		.trans = trans,
 	};

 	if (switchdev_trans_ph_prepare(trans))
 		return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);

 	dp->ageing_time = ageing_time;

 	return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 }

 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 		     u16 vid)
 {
 	struct dsa_notifier_fdb_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.addr = addr,
 		.vid = vid,
 	};

 	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
 }

 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 		     u16 vid)
 {
 	struct dsa_notifier_fdb_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.addr = addr,
 		.vid = vid,

 	};

 	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
 }

 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
 {
 	struct dsa_switch *ds = dp->ds;
 	int port = dp->index;

 	if (!ds->ops->port_fdb_dump)
 		return -EOPNOTSUPP;

 	return ds->ops->port_fdb_dump(ds, port, cb, data);
 }

 int dsa_port_mdb_add(const struct dsa_port *dp,
 		     const struct switchdev_obj_port_mdb *mdb,
 		     struct switchdev_trans *trans)
 {
 	struct dsa_notifier_mdb_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.trans = trans,
 		.mdb = mdb,
 	};

 	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
 }

 int dsa_port_mdb_del(const struct dsa_port *dp,
 		     const struct switchdev_obj_port_mdb *mdb)
 {
 	struct dsa_notifier_mdb_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.mdb = mdb,
 	};

 	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
 }

 int dsa_port_vlan_add(struct dsa_port *dp,
 		      const struct switchdev_obj_port_vlan *vlan,
 		      struct switchdev_trans *trans)
 {
 	struct dsa_notifier_vlan_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.trans = trans,
 		.vlan = vlan,
 	};

 	if (br_vlan_enabled(dp->bridge_dev))
 		return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);

 	return 0;
 }

 int dsa_port_vlan_del(struct dsa_port *dp,
 		      const struct switchdev_obj_port_vlan *vlan)
 {
 	struct dsa_notifier_vlan_info info = {
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.vlan = vlan,
 	};

 	if (br_vlan_enabled(dp->bridge_dev))
 		return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);

 	return 0;
 }

 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
 {
 	struct device_node *port_dn = dp->dn;
 	struct device_node *phy_dn;
 	struct dsa_switch *ds = dp->ds;
 	struct phy_device *phydev;
 	int port = dp->index;
 	int err = 0;

 	phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 	if (!phy_dn)
 		return 0;

 	phydev = of_phy_find_device(phy_dn);
 	if (!phydev) {
 		err = -EPROBE_DEFER;
 		goto err_put_of;
 	}

 	if (enable) {
 		err = genphy_config_init(phydev);
 		if (err < 0)
 			goto err_put_dev;

 		err = genphy_resume(phydev);
 		if (err < 0)
 			goto err_put_dev;

 		err = genphy_read_status(phydev);
 		if (err < 0)
 			goto err_put_dev;
 	} else {
 		err = genphy_suspend(phydev);
 		if (err < 0)
 			goto err_put_dev;
 	}

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

 	dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev));

 err_put_dev:
 	put_device(&phydev->mdio.dev);
 err_put_of:
 	of_node_put(phy_dn);
 	return err;
 }

 static int dsa_port_fixed_link_register_of(struct dsa_port *dp)
 {
 	struct device_node *dn = dp->dn;
 	struct dsa_switch *ds = dp->ds;
 	struct phy_device *phydev;
 	int port = dp->index;
 	int mode;
 	int err;

 	err = of_phy_register_fixed_link(dn);
 	if (err) {
 		dev_err(ds->dev,
 			"failed to register the fixed PHY of port %d\n",
 			port);
 		return err;
 	}

 	phydev = of_phy_find_device(dn);

 	mode = of_get_phy_mode(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;
 }

 int dsa_port_link_register_of(struct dsa_port *dp)
 {
 	if (of_phy_is_fixed_link(dp->dn))
 		return dsa_port_fixed_link_register_of(dp);
 	else
 		return dsa_port_setup_phy_of(dp, true);
 }

 void dsa_port_link_unregister_of(struct dsa_port *dp)
 {
 	if (of_phy_is_fixed_link(dp->dn))
 		of_phy_deregister_fixed_link(dp->dn);
 	else
 		dsa_port_setup_phy_of(dp, false);
 }
	/*
	* Handling of a single switch port
	*
	* Copyright (c) 2017 Savoir-faire Linux Inc.
	* Vivien Didelot <vivien.didelot@savoirfairelinux.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/if_bridge.h>
	#include <linux/notifier.h>
	#include <linux/of_mdio.h>
	#include <linux/of_net.h>

	#include "dsa_priv.h"

	static int dsa_port_notify(const struct dsa_port dp, unsigned long e, void v)
	{
	struct raw_notifier_head *nh = &dp->ds->dst->nh;
	int err;

	err = raw_notifier_call_chain(nh, e, v);

	return notifier_to_errno(err);
	}

	int dsa_port_set_state(struct dsa_port *dp, u8 state,
	struct switchdev_trans *trans)
	{
	struct dsa_switch *ds = dp->ds;
	int port = dp->index;

	if (switchdev_trans_ph_prepare(trans))
	return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;

	if (ds->ops->port_stp_state_set)
	ds->ops->port_stp_state_set(ds, port, state);

	if (ds->ops->port_fast_age) {
	/* Fast age FDB entries or flush appropriate forwarding database
	* for the given port, if we are moving it from Learning or
	* Forwarding state, to Disabled or Blocking or Listening state.
	*/

	if ((dp->stp_state == BR_STATE_LEARNING \|\|
	dp->stp_state == BR_STATE_FORWARDING) &&
	(state == BR_STATE_DISABLED \|\|
	state == BR_STATE_BLOCKING \|\|
	state == BR_STATE_LISTENING))
	ds->ops->port_fast_age(ds, port);
	}

	dp->stp_state = state;

	return 0;
	}

	static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
	{
	int err;

	err = dsa_port_set_state(dp, state, NULL);
	if (err)
	pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
	}

	int dsa_port_enable(struct dsa_port dp, struct phy_device phy)
	{
	u8 stp_state = dp->bridge_dev ? BR_STATE_BLOCKING : BR_STATE_FORWARDING;
	struct dsa_switch *ds = dp->ds;
	int port = dp->index;
	int err;

	if (ds->ops->port_enable) {
	err = ds->ops->port_enable(ds, port, phy);
	if (err)
	return err;
	}

	dsa_port_set_state_now(dp, stp_state);

	return 0;
	}

	void dsa_port_disable(struct dsa_port dp, struct phy_device phy)
	{
	struct dsa_switch *ds = dp->ds;
	int port = dp->index;

	dsa_port_set_state_now(dp, BR_STATE_DISABLED);

	if (ds->ops->port_disable)
	ds->ops->port_disable(ds, port, phy);
	}

	int dsa_port_bridge_join(struct dsa_port dp, struct net_device br)
	{
	struct dsa_notifier_bridge_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.br = br,
	};
	int err;

	/* Here the port is already bridged. Reflect the current configuration
	* so that drivers can program their chips accordingly.
	*/
	dp->bridge_dev = br;

	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);

	/* The bridging is rolled back on error */
	if (err)
	dp->bridge_dev = NULL;

	return err;
	}

	void dsa_port_bridge_leave(struct dsa_port dp, struct net_device br)
	{
	struct dsa_notifier_bridge_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.br = br,
	};
	int err;

	/* Here the port is already unbridged. Reflect the current configuration
	* so that drivers can program their chips accordingly.
	*/
	dp->bridge_dev = NULL;

	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
	if (err)
	pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");

	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
	* so allow it to be in BR_STATE_FORWARDING to be kept functional
	*/
	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
	}

	int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
	struct switchdev_trans *trans)
	{
	struct dsa_switch *ds = dp->ds;

	/* bridge skips -EOPNOTSUPP, so skip the prepare phase */
	if (switchdev_trans_ph_prepare(trans))
	return 0;

	if (ds->ops->port_vlan_filtering)
	return ds->ops->port_vlan_filtering(ds, dp->index,
	vlan_filtering);

	return 0;
	}

	int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
	struct switchdev_trans *trans)
	{
	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
	unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
	struct dsa_notifier_ageing_time_info info = {
	.ageing_time = ageing_time,
	.trans = trans,
	};

	if (switchdev_trans_ph_prepare(trans))
	return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);

	dp->ageing_time = ageing_time;

	return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
	}

	int dsa_port_fdb_add(struct dsa_port dp, const unsigned char addr,
	u16 vid)
	{
	struct dsa_notifier_fdb_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.addr = addr,
	.vid = vid,
	};

	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
	}

	int dsa_port_fdb_del(struct dsa_port dp, const unsigned char addr,
	u16 vid)
	{
	struct dsa_notifier_fdb_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.addr = addr,
	.vid = vid,

	};

	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
	}

	int dsa_port_fdb_dump(struct dsa_port dp, dsa_fdb_dump_cb_t cb, void *data)
	{
	struct dsa_switch *ds = dp->ds;
	int port = dp->index;

	if (!ds->ops->port_fdb_dump)
	return -EOPNOTSUPP;

	return ds->ops->port_fdb_dump(ds, port, cb, data);
	}

	int dsa_port_mdb_add(const struct dsa_port *dp,
	const struct switchdev_obj_port_mdb *mdb,
	struct switchdev_trans *trans)
	{
	struct dsa_notifier_mdb_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.trans = trans,
	.mdb = mdb,
	};

	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
	}

	int dsa_port_mdb_del(const struct dsa_port *dp,
	const struct switchdev_obj_port_mdb *mdb)
	{
	struct dsa_notifier_mdb_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.mdb = mdb,
	};

	return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
	}

	int dsa_port_vlan_add(struct dsa_port *dp,
	const struct switchdev_obj_port_vlan *vlan,
	struct switchdev_trans *trans)
	{
	struct dsa_notifier_vlan_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.trans = trans,
	.vlan = vlan,
	};

	if (br_vlan_enabled(dp->bridge_dev))
	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);

	return 0;
	}

	int dsa_port_vlan_del(struct dsa_port *dp,
	const struct switchdev_obj_port_vlan *vlan)
	{
	struct dsa_notifier_vlan_info info = {
	.sw_index = dp->ds->index,
	.port = dp->index,
	.vlan = vlan,
	};

	if (br_vlan_enabled(dp->bridge_dev))
	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);

	return 0;
	}

	static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
	{
	struct device_node *port_dn = dp->dn;
	struct device_node *phy_dn;
	struct dsa_switch *ds = dp->ds;
	struct phy_device *phydev;
	int port = dp->index;
	int err = 0;

	phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
	if (!phy_dn)
	return 0;

	phydev = of_phy_find_device(phy_dn);
	if (!phydev) {
	err = -EPROBE_DEFER;
	goto err_put_of;
	}

	if (enable) {
	err = genphy_config_init(phydev);
	if (err < 0)
	goto err_put_dev;

	err = genphy_resume(phydev);
	if (err < 0)
	goto err_put_dev;

	err = genphy_read_status(phydev);
	if (err < 0)
	goto err_put_dev;
	} else {
	err = genphy_suspend(phydev);
	if (err < 0)
	goto err_put_dev;
	}

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

	dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev));

	err_put_dev:
	put_device(&phydev->mdio.dev);
	err_put_of:
	of_node_put(phy_dn);
	return err;
	}

	static int dsa_port_fixed_link_register_of(struct dsa_port *dp)
	{
	struct device_node *dn = dp->dn;
	struct dsa_switch *ds = dp->ds;
	struct phy_device *phydev;
	int port = dp->index;
	int mode;
	int err;

	err = of_phy_register_fixed_link(dn);
	if (err) {
	dev_err(ds->dev,
	"failed to register the fixed PHY of port %d\n",
	port);
	return err;
	}

	phydev = of_phy_find_device(dn);

	mode = of_get_phy_mode(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;
	}

	int dsa_port_link_register_of(struct dsa_port *dp)
	{
	if (of_phy_is_fixed_link(dp->dn))
	return dsa_port_fixed_link_register_of(dp);
	else
	return dsa_port_setup_phy_of(dp, true);
	}

	void dsa_port_link_unregister_of(struct dsa_port *dp)
	{
	if (of_phy_is_fixed_link(dp->dn))
	of_phy_deregister_fixed_link(dp->dn);
	else
	dsa_port_setup_phy_of(dp, false);
	}