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.h"
#include "netlink.h"
#include "port.h"
#include "slave.h"
#include "switch.h"
#include "tag_8021q.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)
{
	return dp == info->dp || dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp);
}

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)
{
	int err;

	if (info->dp->ds == ds) {
		if (!ds->ops->port_bridge_join)
			return -EOPNOTSUPP;

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

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

	return 0;
}

static int dsa_switch_bridge_leave(struct dsa_switch *ds,
				   struct dsa_notifier_bridge_info *info)
{
	if (info->dp->ds == ds && ds->ops->port_bridge_leave)
		ds->ops->port_bridge_leave(ds, info->dp->index, info->bridge);

	if (info->dp->ds != ds && ds->ops->crosschip_bridge_leave)
		ds->ops->crosschip_bridge_leave(ds, info->dp->ds->dst->index,
						info->dp->ds->index,
						info->dp->index,
						info->bridge);

	return 0;
}

/* Matches for all upstream-facing ports (the CPU port and all upstream-facing
 * DSA links) that sit between the targeted port on which the notifier was
 * emitted and its dedicated CPU port.
 */
static bool dsa_port_host_address_match(struct dsa_port *dp,
					const struct dsa_port *targeted_dp)
{
	struct dsa_port *cpu_dp = targeted_dp->cpu_dp;

	if (dsa_switch_is_upstream_of(dp->ds, targeted_dp->ds))
		return dp->index == dsa_towards_port(dp->ds, cpu_dp->ds->index,
						     cpu_dp->index);

	return false;
}

static struct dsa_mac_addr *dsa_mac_addr_find(struct list_head *addr_list,
					      const unsigned char *addr, u16 vid,
					      struct dsa_db db)
{
	struct dsa_mac_addr *a;

	list_for_each_entry(a, addr_list, list)
		if (ether_addr_equal(a->addr, addr) && a->vid == vid &&
		    dsa_db_equal(&a->db, &db))
			return a;