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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/dsa/dsa.c - Hardware switch handling
* Copyright (c) 2008-2009 Marvell Semiconductor
* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
*/
#include <linux/device.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
#include "dsa_priv.h"
#include "slave.h"
#include "tag.h"
static int dev_is_class(struct device *dev, void *class)
{
if (dev->class != NULL && !strcmp(dev->class->name, class))
return 1;
return 0;
}
static struct device *dev_find_class(struct device *parent, char *class)
{
if (dev_is_class(parent, class)) {
get_device(parent);
return parent;
}
return device_find_child(parent, class, dev_is_class);
}
struct net_device *dsa_dev_to_net_device(struct device *dev)
{
struct device *d;
d = dev_find_class(dev, "net");
if (d != NULL) {
struct net_device *nd;
nd = to_net_dev(d);
dev_hold(nd);
put_device(d);
return nd;
}
return NULL;
}
#ifdef CONFIG_PM_SLEEP
static bool dsa_port_is_initialized(const struct dsa_port *dp)
{
return dp->type == DSA_PORT_TYPE_USER && dp->slave;
}
int dsa_switch_suspend(struct dsa_switch *ds)
{
struct dsa_port *dp;
int ret = 0;
/* Suspend slave network devices */
dsa_switch_for_each_port(dp, ds) {
if (!dsa_port_is_initialized(dp))
continue;
ret = dsa_slave_suspend(dp->slave);
if (ret)
return ret;
}
if (ds->ops->suspend)
ret = ds->ops->suspend(ds);
return ret;
}
EXPORT_SYMBOL_GPL(dsa_switch_suspend);
int dsa_switch_resume(struct dsa_switch *ds)
{
struct dsa_port *dp;
int ret = 0;
if (ds->ops->resume)
ret = ds->ops->resume(ds);
if (ret)
return ret;
/* Resume slave network devices */
dsa_switch_for_each_port(dp, ds) {
if (!dsa_port_is_initialized(dp))
continue;
ret = dsa_slave_resume(dp->slave);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(dsa_switch_resume);
#endif
static struct workqueue_struct *dsa_owq;
bool dsa_schedule_work(struct work_struct *work)
{
return queue_work(dsa_owq, work);
}
void dsa_flush_workqueue(void)
{
flush_workqueue(dsa_owq);
}
EXPORT_SYMBOL_GPL(dsa_flush_workqueue);
struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
{
if (!netdev || !dsa_slave_dev_check(netdev))
return ERR_PTR(-ENODEV);
return dsa_slave_to_port(netdev);
}
EXPORT_SYMBOL_GPL(dsa_port_from_netdev);
bool dsa_db_equal(const struct dsa_db *a, const struct dsa_db *b)
{
if (a->type != b->type)
return false;
switch (a->type) {
case DSA_DB_PORT:
return a->dp == b->dp;
case DSA_DB_LAG:
return a->lag.dev == b->lag.dev;
case DSA_DB_BRIDGE:
return a->bridge.num == b->bridge.num;
default:
WARN_ON(1);
return false;
}
}
bool dsa_fdb_present_in_other_db(struct dsa_switch *ds, int port,
const unsigned char *addr, u16 vid,
struct dsa_db db)
{
struct dsa_port *dp = dsa_to_port(ds, port);
struct dsa_mac_addr *a;
lockdep_assert_held(&dp->addr_lists_lock);
list_for_each_entry(a, &dp->fdbs, list) {
if (!ether_addr_equal(a->addr, addr) || a->vid != vid)
continue;
if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
return true;
}
return false;
}
EXPORT_SYMBOL_GPL(dsa_fdb_present_in_other_db);
bool dsa_mdb_present_in_other_db(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_mdb *mdb,
struct dsa_db db)
{
struct dsa_port *dp = dsa_to_port(ds, port);
struct dsa_mac_addr *a;
lockdep_assert_held(&dp->addr_lists_lock);
list_for_each_entry(a, &dp->mdbs, list) {
if (!ether_addr_equal(a->addr, mdb->addr) || a->vid != mdb->vid)
continue;
if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
return true;
}
return false;
}
EXPORT_SYMBOL_GPL(dsa_mdb_present_in_other_db);
static int __init dsa_init_module(void)
{
int rc;
dsa_owq = alloc_ordered_workqueue("dsa_ordered",
WQ_MEM_RECLAIM);
if (!dsa_owq)
return -ENOMEM;
rc = dsa_slave_register_notifier();
if (rc)
goto register_notifier_fail;
dev_add_pack(&dsa_pack_type);
rc = rtnl_link_register(&dsa_link_ops);
if (rc)
goto netlink_register_fail;
return 0;
netlink_register_fail:
dsa_slave_unregister_notifier();
dev_remove_pack(&dsa_pack_type);
register_notifier_fail:
destroy_workqueue(dsa_owq);
return rc;
}
module_init(dsa_init_module);
static void __exit dsa_cleanup_module(void)
{
rtnl_link_unregister(&dsa_link_ops);
dsa_slave_unregister_notifier();
dev_remove_pack(&dsa_pack_type);
destroy_workqueue(dsa_owq);
}
module_exit(dsa_cleanup_module);
MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dsa");
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