/* * Handling of a single switch chip, part of a switch fabric * * 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/netdevice.h>#include <linux/notifier.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){	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); 	return 0;} static int dsa_switch_fdb_add(struct dsa_switch *ds,			      struct dsa_notifier_fdb_info *info){	const struct switchdev_obj_port_fdb *fdb = info->fdb;	struct switchdev_trans *trans = info->trans; 	/* Do not care yet about other switch chips of the fabric */	if (ds->index != info->sw_index)		return 0; 	if (switchdev_trans_ph_prepare(trans)) {		if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)			return -EOPNOTSUPP; 		return ds->ops->port_fdb_prepare(ds, info->port, fdb, trans);	} 	ds->ops->port_fdb_add(ds, info->port, fdb, trans); 	return 0;} static int dsa_switch_fdb_del(struct dsa_switch *ds,			      struct dsa_notifier_fdb_info *info){	const struct switchdev_obj_port_fdb *fdb = info->fdb; 	/* Do not care yet about other switch chips of the fabric */	if (ds->index != info->sw_index)		return 0; 	if (!ds->ops->port_fdb_del)		return -EOPNOTSUPP; 	return ds->ops->port_fdb_del(ds, info->port, fdb);} static int dsa_switch_mdb_add(struct dsa_switch *ds,			      struct dsa_notifier_mdb_info *info){	const struct switchdev_obj_port_mdb *mdb = info->mdb;	struct switchdev_trans *trans = info->trans;	DECLARE_BITMAP(group, ds->num_ports);	int port, err; 	/* Build a mask of Multicast group members */	bitmap_zero(group, ds->num_ports);	if (ds->index == info->sw_index)		set_bit(info->port, group);	for (port = 0; port < ds->num_ports; port++)		if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))			set_bit(port, group); 	if (switchdev_trans_ph_prepare(trans)) {		if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)			return -EOPNOTSUPP; 		for_each_set_bit(port, group, ds->num_ports) {			err = ds->ops->port_mdb_prepare(ds, port, mdb, trans);			if (err)				return err;		}	} 	for_each_set_bit(port, group, ds->num_ports)		ds->ops->port_mdb_add(ds, port, mdb, trans); 	return 0;} static int dsa_switch_mdb_del(struct dsa_switch *ds,			      struct dsa_notifier_mdb_info *info){	const struct switchdev_obj_port_mdb *mdb = info->mdb; 	if (!ds->ops->port_mdb_del)		return -EOPNOTSUPP; 	if (ds->index == info->sw_index)		return ds->ops->port_mdb_del(ds, info->port, mdb); 	return 0;} static int dsa_switch_vlan_add(struct dsa_switch *ds,			       struct dsa_notifier_vlan_info *info){	const struct switchdev_obj_port_vlan *vlan = info->vlan;	struct switchdev_trans *trans = info->trans;	DECLARE_BITMAP(members, ds->num_ports);	int port, err; 	/* Build a mask of VLAN members */	bitmap_zero(members, ds->num_ports);	if (ds->index == info->sw_index)		set_bit(info->port, members);	for (port = 0; port < ds->num_ports; port++)		if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))			set_bit(port, members); 	if (switchdev_trans_ph_prepare(trans)) {		if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)			return -EOPNOTSUPP; 		for_each_set_bit(port, members, ds->num_ports) {			err = ds->ops->port_vlan_prepare(ds, port, vlan, trans);			if (err)				return err;		}	} 	for_each_set_bit(port, members, ds->num_ports)		ds->ops->port_vlan_add(ds, port, vlan, trans); 	return 0;} static int dsa_switch_vlan_del(struct dsa_switch *ds,			       struct dsa_notifier_vlan_info *info){	const struct switchdev_obj_port_vlan *vlan = info->vlan; 	if (!ds->ops->port_vlan_del)		return -EOPNOTSUPP; 	if (ds->index == info->sw_index)		return ds->ops->port_vlan_del(ds, info->port, vlan); 	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);}