// 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 = dsa_to_port(ds, 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 bool dsa_switch_mtu_match(struct dsa_switch *ds, int port,				 struct dsa_notifier_mtu_info *info){	if (ds->index == info->sw_index)		return (port == info->port) || dsa_is_dsa_port(ds, port); 	if (!info->propagate_upstream)		return false; 	if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))		return true; 	return false;} static int dsa_switch_mtu(struct dsa_switch *ds,			  struct dsa_notifier_mtu_info *info){	int port, ret; 	if (!ds->ops->port_change_mtu)		return -EOPNOTSUPP; 	for (port = 0; port < ds->num_ports; port++) {		if (dsa_switch_mtu_match(ds, port, info)) {			ret = ds->ops->port_change_mtu(ds, port, info->mtu);			if (ret)				return ret;		}	} 	return 0;} static int dsa_switch_bridge_join(struct dsa_switch *ds,				  struct dsa_notifier_bridge_info *info){	struct dsa_switch_tree *dst = ds->dst; 	if (dst->index == info->tree_index && ds->index == info->sw_index &&	    ds->ops->port_bridge_join)		return ds->ops->port_bridge_join(ds, info->port, info->br); 	if ((dst->index != info->tree_index || ds->index != info->sw_index) &&	    ds->ops->crosschip_bridge_join)		return ds->ops->crosschip_bridge_join(ds, info->tree_index,						      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);	struct dsa_switch_tree *dst = ds->dst;	int err, i; 	if (dst->index == info->tree_index && ds->index == info->sw_index &&	    ds->ops->port_bridge_join)		ds->ops->port_bridge_leave(ds, info->port, info->br); 	if ((dst->index != info->tree_index || ds->index != info->sw_index) &&	    ds->ops->crosschip_bridge_join)		ds->ops->crosschip_bridge_leave(ds, info->tree_index,						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(dsa_to_port(ds, 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;	case DSA_NOTIFIER_MTU:		err = dsa_switch_mtu(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);}