net/dsa/switch.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Handling of a single switch chip, part of a switch fabric
  *
  * Copyright (c) 2017 Savoir-faire Linux Inc.
  *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
  */

 #include <linux/if_bridge.h>
 #include <linux/netdevice.h>
 #include <linux/notifier.h>
 #include <linux/if_vlan.h>
 #include <net/switchdev.h>

 #include "dsa_priv.h"

 static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
 						   unsigned int ageing_time)
 {
 	int i;

 	for (i = 0; i < ds->num_ports; ++i) {
 		struct dsa_port *dp = &ds->ports[i];

 		if (dp->ageing_time && dp->ageing_time < ageing_time)
 			ageing_time = dp->ageing_time;
 	}

 	return ageing_time;
 }

 static int dsa_switch_ageing_time(struct dsa_switch *ds,
 				  struct dsa_notifier_ageing_time_info *info)
 {
 	unsigned int ageing_time = info->ageing_time;
 	struct switchdev_trans *trans = info->trans;

 	if (switchdev_trans_ph_prepare(trans)) {
 		if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
 			return -ERANGE;
 		if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
 			return -ERANGE;
 		return 0;
 	}

 	/* Program the fastest ageing time in case of multiple bridges */
 	ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);

 	if (ds->ops->set_ageing_time)
 		return ds->ops->set_ageing_time(ds, ageing_time);

 	return 0;
 }

 static int dsa_switch_bridge_join(struct dsa_switch *ds,
 				  struct dsa_notifier_bridge_info *info)
 {
 	if (ds->index == info->sw_index && ds->ops->port_bridge_join)
 		return ds->ops->port_bridge_join(ds, info->port, info->br);

 	if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
 		return ds->ops->crosschip_bridge_join(ds, info->sw_index,
 						      info->port, info->br);

 	return 0;
 }

 static int dsa_switch_bridge_leave(struct dsa_switch *ds,
 				   struct dsa_notifier_bridge_info *info)
 {
 	bool unset_vlan_filtering = br_vlan_enabled(info->br);
 	int err, i;

 	if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
 		ds->ops->port_bridge_leave(ds, info->port, info->br);

 	if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
 		ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
 						info->br);

 	/* If the bridge was vlan_filtering, the bridge core doesn't trigger an
 	 * event for changing vlan_filtering setting upon slave ports leaving
 	 * it. That is a good thing, because that lets us handle it and also
 	 * handle the case where the switch's vlan_filtering setting is global
 	 * (not per port). When that happens, the correct moment to trigger the
 	 * vlan_filtering callback is only when the last port left this bridge.
 	 */
 	if (unset_vlan_filtering && ds->vlan_filtering_is_global) {
 		for (i = 0; i < ds->num_ports; i++) {
 			if (i == info->port)
 				continue;
 			if (dsa_to_port(ds, i)->bridge_dev == info->br) {
 				unset_vlan_filtering = false;
 				break;
 			}
 		}
 	}
 	if (unset_vlan_filtering) {
 		struct switchdev_trans trans = {0};

 		err = dsa_port_vlan_filtering(&ds->ports[info->port],
 					      false, &trans);
 		if (err && err != EOPNOTSUPP)
 			return err;
 	}
 	return 0;
 }

 static int dsa_switch_fdb_add(struct dsa_switch *ds,
 			      struct dsa_notifier_fdb_info *info)
 {
 	int port = dsa_towards_port(ds, info->sw_index, info->port);

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

 	return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
 }

 static int dsa_switch_fdb_del(struct dsa_switch *ds,
 			      struct dsa_notifier_fdb_info *info)
 {
 	int port = dsa_towards_port(ds, info->sw_index, info->port);

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

 	return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
 }

 static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port,
 				 struct dsa_notifier_mdb_info *info)
 {
 	if (ds->index == info->sw_index && port == info->port)
 		return true;

 	if (dsa_is_dsa_port(ds, port))
 		return true;

 	return false;
 }

 static int dsa_switch_mdb_prepare(struct dsa_switch *ds,
 				  struct dsa_notifier_mdb_info *info)
 {
 	int port, err;

 	if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 		return -EOPNOTSUPP;

 	for (port = 0; port < ds->num_ports; port++) {
 		if (dsa_switch_mdb_match(ds, port, info)) {
 			err = ds->ops->port_mdb_prepare(ds, port, info->mdb);
 			if (err)
 				return err;
 		}
 	}

 	return 0;
 }

 static int dsa_switch_mdb_add(struct dsa_switch *ds,
 			      struct dsa_notifier_mdb_info *info)
 {
 	int port;

 	if (switchdev_trans_ph_prepare(info->trans))
 		return dsa_switch_mdb_prepare(ds, info);

 	if (!ds->ops->port_mdb_add)
 		return 0;

 	for (port = 0; port < ds->num_ports; port++)
 		if (dsa_switch_mdb_match(ds, port, info))
 			ds->ops->port_mdb_add(ds, port, info->mdb);

 	return 0;
 }

 static int dsa_switch_mdb_del(struct dsa_switch *ds,
 			      struct dsa_notifier_mdb_info *info)
 {
 	if (!ds->ops->port_mdb_del)
 		return -EOPNOTSUPP;

 	if (ds->index == info->sw_index)
 		return ds->ops->port_mdb_del(ds, info->port, info->mdb);

 	return 0;
 }

 static int dsa_port_vlan_device_check(struct net_device *vlan_dev,
 				      int vlan_dev_vid,
 				      void *arg)
 {
 	struct switchdev_obj_port_vlan *vlan = arg;
 	u16 vid;

 	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 		if (vid == vlan_dev_vid)
 			return -EBUSY;
 	}

 	return 0;
 }

 static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
 			       const struct switchdev_obj_port_vlan *vlan)
 {
 	const struct dsa_port *dp = dsa_to_port(ds, port);
 	int err = 0;

 	/* Device is not bridged, let it proceed with the VLAN device
 	 * creation.
 	 */
 	if (!dp->bridge_dev)
 		return err;

 	/* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and
 	 * already checks whether there is an overlapping bridge VLAN entry
 	 * with the same VID, so here we only need to check that if we are
 	 * adding a bridge VLAN entry there is not an overlapping VLAN device
 	 * claiming that VID.
 	 */
 	return vlan_for_each(dp->slave, dsa_port_vlan_device_check,
 			     (void *)vlan);
 }

 static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
 				  struct dsa_notifier_vlan_info *info)
 {
 	if (ds->index == info->sw_index && port == info->port)
 		return true;

 	if (dsa_is_dsa_port(ds, port))
 		return true;

 	return false;
 }

 static int dsa_switch_vlan_prepare(struct dsa_switch *ds,
 				   struct dsa_notifier_vlan_info *info)
 {
 	int port, err;

 	if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 		return -EOPNOTSUPP;

 	for (port = 0; port < ds->num_ports; port++) {
 		if (dsa_switch_vlan_match(ds, port, info)) {
 			err = dsa_port_vlan_check(ds, port, info->vlan);
 			if (err)
 				return err;

 			err = ds->ops->port_vlan_prepare(ds, port, info->vlan);
 			if (err)
 				return err;
 		}
 	}

 	return 0;
 }

 static int dsa_switch_vlan_add(struct dsa_switch *ds,
 			       struct dsa_notifier_vlan_info *info)
 {
 	int port;

 	if (switchdev_trans_ph_prepare(info->trans))
 		return dsa_switch_vlan_prepare(ds, info);

 	if (!ds->ops->port_vlan_add)
 		return 0;

 	for (port = 0; port < ds->num_ports; port++)
 		if (dsa_switch_vlan_match(ds, port, info))
 			ds->ops->port_vlan_add(ds, port, info->vlan);

 	return 0;
 }

 static int dsa_switch_vlan_del(struct dsa_switch *ds,
 			       struct dsa_notifier_vlan_info *info)
 {
 	if (!ds->ops->port_vlan_del)
 		return -EOPNOTSUPP;

 	if (ds->index == info->sw_index)
 		return ds->ops->port_vlan_del(ds, info->port, info->vlan);

 	/* Do not deprogram the DSA links as they may be used as conduit
 	 * for other VLAN members in the fabric.
 	 */
 	return 0;
 }

 static int dsa_switch_event(struct notifier_block *nb,
 			    unsigned long event, void *info)
 {
 	struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
 	int err;

 	switch (event) {
 	case DSA_NOTIFIER_AGEING_TIME:
 		err = dsa_switch_ageing_time(ds, info);
 		break;
 	case DSA_NOTIFIER_BRIDGE_JOIN:
 		err = dsa_switch_bridge_join(ds, info);
 		break;
 	case DSA_NOTIFIER_BRIDGE_LEAVE:
 		err = dsa_switch_bridge_leave(ds, info);
 		break;
 	case DSA_NOTIFIER_FDB_ADD:
 		err = dsa_switch_fdb_add(ds, info);
 		break;
 	case DSA_NOTIFIER_FDB_DEL:
 		err = dsa_switch_fdb_del(ds, info);
 		break;
 	case DSA_NOTIFIER_MDB_ADD:
 		err = dsa_switch_mdb_add(ds, info);
 		break;
 	case DSA_NOTIFIER_MDB_DEL:
 		err = dsa_switch_mdb_del(ds, info);
 		break;
 	case DSA_NOTIFIER_VLAN_ADD:
 		err = dsa_switch_vlan_add(ds, info);
 		break;
 	case DSA_NOTIFIER_VLAN_DEL:
 		err = dsa_switch_vlan_del(ds, info);
 		break;
 	default:
 		err = -EOPNOTSUPP;
 		break;
 	}

 	/* Non-switchdev operations cannot be rolled back. If a DSA driver
 	 * returns an error during the chained call, switch chips may be in an
 	 * inconsistent state.
 	 */
 	if (err)
 		dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
 			event, err);

 	return notifier_from_errno(err);
 }

 int dsa_switch_register_notifier(struct dsa_switch *ds)
 {
 	ds->nb.notifier_call = dsa_switch_event;

 	return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
 }

 void dsa_switch_unregister_notifier(struct dsa_switch *ds)
 {
 	int err;

 	err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
 	if (err)
 		dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Handling of a single switch chip, part of a switch fabric
	*
	* Copyright (c) 2017 Savoir-faire Linux Inc.
	* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
	*/

	#include <linux/if_bridge.h>
	#include <linux/netdevice.h>
	#include <linux/notifier.h>
	#include <linux/if_vlan.h>
	#include <net/switchdev.h>

	#include "dsa_priv.h"

	static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
	unsigned int ageing_time)
	{
	int i;

	for (i = 0; i < ds->num_ports; ++i) {
	struct dsa_port *dp = &ds->ports[i];

	if (dp->ageing_time && dp->ageing_time < ageing_time)
	ageing_time = dp->ageing_time;
	}

	return ageing_time;
	}

	static int dsa_switch_ageing_time(struct dsa_switch *ds,
	struct dsa_notifier_ageing_time_info *info)
	{
	unsigned int ageing_time = info->ageing_time;
	struct switchdev_trans *trans = info->trans;

	if (switchdev_trans_ph_prepare(trans)) {
	if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
	return -ERANGE;
	if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
	return -ERANGE;
	return 0;
	}

	/* Program the fastest ageing time in case of multiple bridges */
	ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);

	if (ds->ops->set_ageing_time)
	return ds->ops->set_ageing_time(ds, ageing_time);

	return 0;
	}

	static int dsa_switch_bridge_join(struct dsa_switch *ds,
	struct dsa_notifier_bridge_info *info)
	{
	if (ds->index == info->sw_index && ds->ops->port_bridge_join)
	return ds->ops->port_bridge_join(ds, info->port, info->br);

	if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
	return ds->ops->crosschip_bridge_join(ds, info->sw_index,
	info->port, info->br);

	return 0;
	}

	static int dsa_switch_bridge_leave(struct dsa_switch *ds,
	struct dsa_notifier_bridge_info *info)
	{
	bool unset_vlan_filtering = br_vlan_enabled(info->br);
	int err, i;

	if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
	ds->ops->port_bridge_leave(ds, info->port, info->br);

	if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
	ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
	info->br);

	/* If the bridge was vlan_filtering, the bridge core doesn't trigger an
	* event for changing vlan_filtering setting upon slave ports leaving
	* it. That is a good thing, because that lets us handle it and also
	* handle the case where the switch's vlan_filtering setting is global
	* (not per port). When that happens, the correct moment to trigger the
	* vlan_filtering callback is only when the last port left this bridge.
	*/
	if (unset_vlan_filtering && ds->vlan_filtering_is_global) {
	for (i = 0; i < ds->num_ports; i++) {
	if (i == info->port)
	continue;
	if (dsa_to_port(ds, i)->bridge_dev == info->br) {
	unset_vlan_filtering = false;
	break;
	}
	}
	}
	if (unset_vlan_filtering) {
	struct switchdev_trans trans = {0};

	err = dsa_port_vlan_filtering(&ds->ports[info->port],
	false, &trans);
	if (err && err != EOPNOTSUPP)
	return err;
	}
	return 0;
	}

	static int dsa_switch_fdb_add(struct dsa_switch *ds,
	struct dsa_notifier_fdb_info *info)
	{
	int port = dsa_towards_port(ds, info->sw_index, info->port);

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

	return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
	}

	static int dsa_switch_fdb_del(struct dsa_switch *ds,
	struct dsa_notifier_fdb_info *info)
	{
	int port = dsa_towards_port(ds, info->sw_index, info->port);

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

	return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
	}

	static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port,
	struct dsa_notifier_mdb_info *info)
	{
	if (ds->index == info->sw_index && port == info->port)
	return true;

	if (dsa_is_dsa_port(ds, port))
	return true;

	return false;
	}

	static int dsa_switch_mdb_prepare(struct dsa_switch *ds,
	struct dsa_notifier_mdb_info *info)
	{
	int port, err;

	if (!ds->ops->port_mdb_prepare \|\| !ds->ops->port_mdb_add)
	return -EOPNOTSUPP;

	for (port = 0; port < ds->num_ports; port++) {
	if (dsa_switch_mdb_match(ds, port, info)) {
	err = ds->ops->port_mdb_prepare(ds, port, info->mdb);
	if (err)
	return err;
	}
	}

	return 0;
	}

	static int dsa_switch_mdb_add(struct dsa_switch *ds,
	struct dsa_notifier_mdb_info *info)
	{
	int port;

	if (switchdev_trans_ph_prepare(info->trans))
	return dsa_switch_mdb_prepare(ds, info);

	if (!ds->ops->port_mdb_add)
	return 0;

	for (port = 0; port < ds->num_ports; port++)
	if (dsa_switch_mdb_match(ds, port, info))
	ds->ops->port_mdb_add(ds, port, info->mdb);

	return 0;
	}

	static int dsa_switch_mdb_del(struct dsa_switch *ds,
	struct dsa_notifier_mdb_info *info)
	{
	if (!ds->ops->port_mdb_del)
	return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
	return ds->ops->port_mdb_del(ds, info->port, info->mdb);

	return 0;
	}

	static int dsa_port_vlan_device_check(struct net_device *vlan_dev,
	int vlan_dev_vid,
	void *arg)
	{
	struct switchdev_obj_port_vlan *vlan = arg;
	u16 vid;

	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
	if (vid == vlan_dev_vid)
	return -EBUSY;
	}

	return 0;
	}

	static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
	const struct switchdev_obj_port_vlan *vlan)
	{
	const struct dsa_port *dp = dsa_to_port(ds, port);
	int err = 0;

	/* Device is not bridged, let it proceed with the VLAN device
	* creation.
	*/
	if (!dp->bridge_dev)
	return err;

	/* dsa_slave_vlan_rx_{add,kill}_vid() cannot use the prepare phase and
	* already checks whether there is an overlapping bridge VLAN entry
	* with the same VID, so here we only need to check that if we are
	* adding a bridge VLAN entry there is not an overlapping VLAN device
	* claiming that VID.
	*/
	return vlan_for_each(dp->slave, dsa_port_vlan_device_check,
	(void *)vlan);
	}

	static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
	struct dsa_notifier_vlan_info *info)
	{
	if (ds->index == info->sw_index && port == info->port)
	return true;

	if (dsa_is_dsa_port(ds, port))
	return true;

	return false;
	}

	static int dsa_switch_vlan_prepare(struct dsa_switch *ds,
	struct dsa_notifier_vlan_info *info)
	{
	int port, err;

	if (!ds->ops->port_vlan_prepare \|\| !ds->ops->port_vlan_add)
	return -EOPNOTSUPP;

	for (port = 0; port < ds->num_ports; port++) {
	if (dsa_switch_vlan_match(ds, port, info)) {
	err = dsa_port_vlan_check(ds, port, info->vlan);
	if (err)
	return err;

	err = ds->ops->port_vlan_prepare(ds, port, info->vlan);
	if (err)
	return err;
	}
	}

	return 0;
	}

	static int dsa_switch_vlan_add(struct dsa_switch *ds,
	struct dsa_notifier_vlan_info *info)
	{
	int port;

	if (switchdev_trans_ph_prepare(info->trans))
	return dsa_switch_vlan_prepare(ds, info);

	if (!ds->ops->port_vlan_add)
	return 0;

	for (port = 0; port < ds->num_ports; port++)
	if (dsa_switch_vlan_match(ds, port, info))
	ds->ops->port_vlan_add(ds, port, info->vlan);

	return 0;
	}

	static int dsa_switch_vlan_del(struct dsa_switch *ds,
	struct dsa_notifier_vlan_info *info)
	{
	if (!ds->ops->port_vlan_del)
	return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
	return ds->ops->port_vlan_del(ds, info->port, info->vlan);

	/* Do not deprogram the DSA links as they may be used as conduit
	* for other VLAN members in the fabric.
	*/
	return 0;
	}

	static int dsa_switch_event(struct notifier_block *nb,
	unsigned long event, void *info)
	{
	struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
	int err;

	switch (event) {
	case DSA_NOTIFIER_AGEING_TIME:
	err = dsa_switch_ageing_time(ds, info);
	break;
	case DSA_NOTIFIER_BRIDGE_JOIN:
	err = dsa_switch_bridge_join(ds, info);
	break;
	case DSA_NOTIFIER_BRIDGE_LEAVE:
	err = dsa_switch_bridge_leave(ds, info);
	break;
	case DSA_NOTIFIER_FDB_ADD:
	err = dsa_switch_fdb_add(ds, info);
	break;
	case DSA_NOTIFIER_FDB_DEL:
	err = dsa_switch_fdb_del(ds, info);
	break;
	case DSA_NOTIFIER_MDB_ADD:
	err = dsa_switch_mdb_add(ds, info);
	break;
	case DSA_NOTIFIER_MDB_DEL:
	err = dsa_switch_mdb_del(ds, info);
	break;
	case DSA_NOTIFIER_VLAN_ADD:
	err = dsa_switch_vlan_add(ds, info);
	break;
	case DSA_NOTIFIER_VLAN_DEL:
	err = dsa_switch_vlan_del(ds, info);
	break;
	default:
	err = -EOPNOTSUPP;
	break;
	}

	/* Non-switchdev operations cannot be rolled back. If a DSA driver
	* returns an error during the chained call, switch chips may be in an
	* inconsistent state.
	*/
	if (err)
	dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
	event, err);

	return notifier_from_errno(err);
	}

	int dsa_switch_register_notifier(struct dsa_switch *ds)
	{
	ds->nb.notifier_call = dsa_switch_event;

	return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
	}

	void dsa_switch_unregister_notifier(struct dsa_switch *ds)
	{
	int err;

	err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
	if (err)
	dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
	}