path: root/net/dsa/switch.c

// 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)
{
	struct dsa_port *dp;

	dsa_switch_for_each_port(dp, ds)
		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;

	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;

	/* 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_port_mtu_match(struct dsa_port *dp,
			       struct dsa_notifier_mtu_info *info)
{
	if (dp->ds->index == info->sw_index && dp->index == info->port)
		return true;

	/* Do not propagate to other switches in the tree if the notifier was
	 * targeted for a single switch.
	 */
	if (info->targeted_match)
		return false;

	if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp))
		return true;

	return false;
}

static int dsa_switch_mtu(struct dsa_switch *ds,
			  struct dsa_notifier_mtu_info *info)
{
	struct dsa_port *dp;
	int ret;

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

	dsa_switch_for_each_port(dp, ds) {
		if (dsa_port_mtu_match(dp, info)) {
			ret = ds->ops->port_change_mtu(ds, dp->index,
						       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;
	int err;

	if (dst->index == info->tree_index && ds->index == info->sw_index) {
		if (!ds->ops->port_bridge_join)
			return -EOPNOTSUPP;

		err = ds->ops->port_bridge_join(ds, info->port, info->bridge,
						&info->tx_fwd_offload,
						info->extack);
		if (err)
			return err;
	}

	if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
	    ds->ops->crosschip_bridge_join) {
		err = ds->ops->crosschip_bridge_join(ds, info->tree_index,
						     info->sw_index,
						     info->port, info->bridge,
						     info->extack);
		if (err)
			return err;
	}

	return 0;
}

static int dsa_switch_sync_vlan_filtering(struct dsa_switch *ds,
					  struct dsa_notifier_bridge_info *info)
{
	struct netlink_ext_ack extack = {0};
	bool change_vlan_filtering = false;
	bool vlan_filtering;
	struct dsa_port *dp;
	int err;

	if (ds->needs_standalone_vlan_filtering &&
	    !br_vlan_enabled(info->bridge.dev)) {
		change_vlan_filtering = true;
		vlan_filtering = true;
	} else if (!ds->needs_standalone_vlan_filtering &&
		   br_vlan_enabled(info->bridge.dev)) {
		change_vlan_filtering = true;
		vlan_filtering = false;
	}

	/* 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 leaves the last
	 * VLAN-aware bridge.
	 */
	if (change_vlan_filtering && ds->vlan_filtering_is_global) {
		dsa_switch_for_each_port(dp, ds) {
			struct net_device *br = dsa_port_bridge_dev_get(dp);

			if (