[linux-block.git] / net / bridge / br_if.c

/*
 *	Userspace interface
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	$Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
 *
 *	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/kernel.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/if_arp.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/rtnetlink.h>
#include <net/sock.h>

#include "br_private.h"

/*
 * Determine initial path cost based on speed.
 * using recommendations from 802.1d standard
 *
 * Need to simulate user ioctl because not all device's that support
 * ethtool, use ethtool_ops.  Also, since driver might sleep need to
 * not be holding any locks.
 */
static int port_cost(struct net_device *dev)
{
	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	struct ifreq ifr;
	mm_segment_t old_fs;
	int err;

	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
	ifr.ifr_data = (void __user *) &ecmd;

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = dev_ethtool(&ifr);
	set_fs(old_fs);
	
	if (!err) {
		switch(ecmd.speed) {
		case SPEED_100:
			return 19;
		case SPEED_1000:
			return 4;
		case SPEED_10000:
			return 2;
		case SPEED_10:
			return 100;
		}
	}

	/* Old silly heuristics based on name */
	if (!strncmp(dev->name, "lec", 3))
		return 7;

	if (!strncmp(dev->name, "plip", 4))
		return 2500;

	return 100;	/* assume old 10Mbps */
}


/*
 * Check for port carrier transistions.
 * Called from work queue to allow for calling functions that
 * might sleep (such as speed check), and to debounce.
 */
static void port_carrier_check(void *arg)
{
	struct net_bridge_port *p = arg;

	rtnl_lock();
	if (netif_carrier_ok(p->dev)) {
		u32 cost = port_cost(p->dev);

		spin_lock_bh(&p->br->lock);
		if (p->state == BR_STATE_DISABLED) {
			p->path_cost = cost;
			br_stp_enable_port(p);
		}
		spin_unlock_bh(&p->br->lock);
	} else {
		spin_lock_bh(&p->br->lock);
		if (p->state != BR_STATE_DISABLED)
			br_stp_disable_port(p);
		spin_unlock_bh(&p->br->lock);
	}
	rtnl_unlock();
}

static void destroy_nbp(struct net_bridge_port *p)
{
	struct net_device *dev = p->dev;

	p->br = NULL;
	p->dev = NULL;
	dev_put(dev);

	br_sysfs_freeif(p);
}

static void destroy_nbp_rcu(struct rcu_head *head)
{
	struct net_bridge_port *p =
			container_of(head, struct net_bridge_port, rcu);
	destroy_nbp(p);
}

/* called with RTNL */
static void del_nbp(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	struct net_device *dev = p->dev;

	dev->br_port = NULL;
	dev_set_promiscuity(dev, -1);

	cancel_delayed_work(&p->carrier_check);
	flush_scheduled_work();

	spin_lock_bh(&br->lock);
	br_stp_disable_port(p);
	spin_unlock_bh(&br->lock);

	br_fdb_delete_by_port(br, p);

	list_del_rcu(&p->list);

	del_timer_sync(&p->message_age_timer);
	del_timer_sync(&p->forward_delay_timer);
	del_timer_sync(&p->hold_timer);
	
	call_rcu(&p->rcu, destroy_nbp_rcu);
}

/* called with RTNL */
static void del_br(struct net_bridge *br)
{
	struct net_bridge_port *p, *n;

	list_for_each_entry_safe(p, n, &br->port_list, list) {
		br_sysfs_removeif(p);
		del_nbp(p);
	}

	del_timer_sync(&br->gc_timer);

	br_sysfs_delbr(br->dev);
 	unregister_netdevice(br->dev);
}

static struct net_device *new_bridge_dev(const char *name)
{
	struct net_bridge *br;
	struct net_device *dev;

	dev = alloc_netdev(sizeof(struct net_bridge), name,
			   br_dev_setup);
	
	if (!dev)
		return NULL;

	br = netdev_priv(dev);
	br->dev = dev;

	spin_lock_init(&br->lock);
	INIT_LIST_HEAD(&br->port_list);
	spin_lock_init(&br->hash_lock);

	br->bridge_id.prio[0] = 0x80;
	br->bridge_id.prio[1] = 0x00;
	memset(br->bridge_id.addr, 0, ETH_ALEN);

	br->feature_mask = dev->features;
	br->stp_enabled = 0;
	br->designated_root = br->bridge_id;
	br->root_path_cost = 0;
	br->root_port = 0;
	br->bridge_max_age = br->max_age = 20 * HZ;
	br->bridge_hello_time = br->hello_time = 2 * HZ;
	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	br->topology_change = 0;
	br->topology_change_detected = 0;
	br->ageing_time = 300 * HZ;
	INIT_LIST_HEAD(&br->age_list);

	br_stp_timer_init(br);

	return dev;
}

/* find an available port number */
static int find_portno(struct net_bridge *br)
{
	int index;
	struct net_bridge_port *p;
	unsigned long *inuse;

	inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long),
			GFP_KERNEL);
	if (!inuse)
		return -ENOMEM;

	memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long));
	set_bit(0, inuse);	/* zero is reserved */
	list_for_each_entry(p, &br->port_list, list) {
		set_bit(p->port_no, inuse);
	}
	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	kfree(inuse);

	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
}

/* called with RTNL but without bridge lock */
static struct net_bridge_port *new_nbp(struct net_bridge *br, 
				       struct net_device *dev)
{
	int index;
	struct net_bridge_port *p;
	
	index = find_portno(br);
	if (index < 0)
		return ERR_PTR(index);

	p = kmalloc(sizeof(*p), GFP_KERNEL);
	if (p == NULL)
		return ERR_PTR(-ENOMEM);

	memset(p, 0, sizeof(*p));
	p->br = br;
	dev_hold(dev);
	p->dev = dev;
	p->path_cost = port_cost(dev);
 	p->priority = 0x8000 >> BR_PORT_BITS;
	dev->br_port = p;
	p->port_no = index;
	br_init_port(p);
	p->state = BR_STATE_DISABLED;
	INIT_WORK(&p->carrier_check, port_carrier_check, p);
	kobject_init(&p->kobj);

	return p;
}

int br_add_bridge(const char *name)
{
	struct net_device *dev;
	int ret;

	dev = new_bridge_dev(name);
	if (!dev) 
		return -ENOMEM;

	rtnl_lock();
	if (strchr(dev->name, '%')) {
		ret = dev_alloc_name(dev, dev->name);
		if (ret < 0)
			goto err1;
	}

	ret = register_netdevice(dev);
	if (ret)
		goto err2;

	/* network device kobject is not setup until
	 * after rtnl_unlock does it's hotplug magic.
	 * so hold reference to avoid race.
	 */
	dev_hold(dev);
	rtnl_unlock();

	ret = br_sysfs_addbr(dev);
	dev_put(dev);

	if (ret) 
		unregister_netdev(dev);
 out:
	return ret;

 err2:
	free_netdev(dev);
 err1:
	rtnl_unlock();
	goto out;
}

int br_del_bridge(const char *name)
{
	struct net_device *dev;
	int ret = 0;

	rtnl_lock();
	dev = __dev_get_by_name(name);
	if (dev == NULL) 
		ret =  -ENXIO; 	/* Could not find device */

	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
		/* Attempt to delete non bridge device! */
		ret = -EPERM;
	}

	else if (dev->flags & IFF_UP) {
		/* Not shutdown yet. */
		ret = -EBUSY;
	} 

	else 
		del_br(netdev_priv(dev));

	rtnl_unlock();
	return ret;
}

/* Mtu of the bridge pseudo-device 1500 or the minimum of the ports */
int br_min_mtu(const struct net_bridge *br)
{
	const struct net_bridge_port *p;
	int mtu = 0;

	ASSERT_RTNL();

	if (list_empty(&br->port_list))
		mtu = 1500;
	else {
		list_for_each_entry(p, &br->port_list, list) {
			if (!mtu  || p->dev->mtu < mtu)
				mtu = p->dev->mtu;
		}
	}
	return mtu;
}

/*
 * Recomputes features using slave's features
 */
void br_features_recompute(struct net_bridge *br)
{
	struct net_bridge_port *p;
	unsigned long features, checksum;

	features = br->feature_mask &~ NETIF_F_IP_CSUM;
	checksum = br->feature_mask & NETIF_F_IP_CSUM;

	list_for_each_entry(p, &br->port_list, list) {
		if (!(p->dev->features 
		      & (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)))
			checksum = 0;
		features &= p->dev->features;
	}

	br->dev->features = features | checksum | NETIF_F_LLTX;
}

/* called with RTNL */
int br_add_if(struct net_bridge *br, struct net_device *dev)
{
	struct net_bridge_port *p;
	int err = 0;

	if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
		return -EINVAL;

	if (dev->hard_start_xmit == br_dev_xmit)
		return -ELOOP;

	if (dev->br_port != NULL)
		return -EBUSY;

	if (IS_ERR(p = new_nbp(br, dev)))
		return PTR_ERR(p);

 	if ((err = br_fdb_insert(br, p, dev->dev_addr)))
		destroy_nbp(p);
 
	else if ((err = br_sysfs_addif(p)))
		del_nbp(p);
	else {
		dev_set_promiscuity(dev, 1);

		list_add_rcu(&p->list, &br->port_list);

		spin_lock_bh(&br->lock);
		br_stp_recalculate_bridge_id(br);
		br_features_recompute(br);
		if ((br->dev->flags & IFF_UP) 
		    && (dev->flags & IFF_UP) && netif_carrier_ok(dev))
			br_stp_enable_port(p);
		spin_unlock_bh(&br->lock);

		dev_set_mtu(br->dev, br_min_mtu(br));
	}

	return err;
}

/* called with RTNL */
int br_del_if(struct net_bridge *br, struct net_device *dev)
{
	struct net_bridge_port *p = dev->br_port;
	
	if (!p || p->br != br) 
		return -EINVAL;

	br_sysfs_removeif(p);
	del_nbp(p);

	spin_lock_bh(&br->lock);
	br_stp_recalculate_bridge_id(br);
	br_features_recompute(br);
	spin_unlock_bh(&br->lock);

	return 0;
}

void __exit br_cleanup_bridges(void)
{
	struct net_device *dev, *nxt;

	rtnl_lock();
	for (dev = dev_base; dev; dev = nxt) {
		nxt = dev->next;
		if (dev->priv_flags & IFF_EBRIDGE)
			del_br(dev->priv);
	}
	rtnl_unlock();

}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Userspace interface
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
	8	* $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/netdevice.h>
	18	#include <linux/ethtool.h>
	19	#include <linux/if_arp.h>
	20	#include <linux/module.h>
	21	#include <linux/init.h>
	22	#include <linux/rtnetlink.h>
	23	#include <net/sock.h>
	24
	25	#include "br_private.h"
	26
	27	/*
	28	* Determine initial path cost based on speed.
	29	* using recommendations from 802.1d standard
	30	*
	31	* Need to simulate user ioctl because not all device's that support
	32	* ethtool, use ethtool_ops. Also, since driver might sleep need to
	33	* not be holding any locks.
	34	*/
4433f420	35	static int port_cost(struct net_device *dev)
1da177e4	36	{
1da177e4 LT	37	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	38	struct ifreq ifr;
	39	mm_segment_t old_fs;
	40	int err;
	41
	42	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
	43	ifr.ifr_data = (void __user *) &ecmd;
	44
	45	old_fs = get_fs();
	46	set_fs(KERNEL_DS);
	47	err = dev_ethtool(&ifr);
	48	set_fs(old_fs);
	49
	50	if (!err) {
	51	switch(ecmd.speed) {
	52	case SPEED_100:
	53	return 19;
	54	case SPEED_1000:
	55	return 4;
	56	case SPEED_10000:
	57	return 2;
	58	case SPEED_10:
	59	return 100;
1da177e4 LT	60	}
	61	}
	62
	63	/* Old silly heuristics based on name */
	64	if (!strncmp(dev->name, "lec", 3))
	65	return 7;
	66
	67	if (!strncmp(dev->name, "plip", 4))
	68	return 2500;
	69
	70	return 100; /* assume old 10Mbps */
	71	}
	72
4433f420 SH	73
	74	/*
	75	* Check for port carrier transistions.
	76	* Called from work queue to allow for calling functions that
	77	* might sleep (such as speed check), and to debounce.
	78	*/
	79	static void port_carrier_check(void *arg)
	80	{
	81	struct net_bridge_port *p = arg;
	82
	83	rtnl_lock();
	84	if (netif_carrier_ok(p->dev)) {
	85	u32 cost = port_cost(p->dev);
	86
	87	spin_lock_bh(&p->br->lock);
	88	if (p->state == BR_STATE_DISABLED) {
	89	p->path_cost = cost;
	90	br_stp_enable_port(p);
	91	}
	92	spin_unlock_bh(&p->br->lock);
	93	} else {
	94	spin_lock_bh(&p->br->lock);
	95	if (p->state != BR_STATE_DISABLED)
	96	br_stp_disable_port(p);
	97	spin_unlock_bh(&p->br->lock);
	98	}
	99	rtnl_unlock();
	100	}
	101
1da177e4 LT	102	static void destroy_nbp(struct net_bridge_port *p)
	103	{
	104	struct net_device *dev = p->dev;
	105
1da177e4 LT	106	p->br = NULL;
	107	p->dev = NULL;
	108	dev_put(dev);
	109
	110	br_sysfs_freeif(p);
	111	}
	112
	113	static void destroy_nbp_rcu(struct rcu_head *head)
	114	{
	115	struct net_bridge_port *p =
	116	container_of(head, struct net_bridge_port, rcu);
	117	destroy_nbp(p);
	118	}
	119
	120	/* called with RTNL */
	121	static void del_nbp(struct net_bridge_port *p)
	122	{
	123	struct net_bridge *br = p->br;
	124	struct net_device *dev = p->dev;
	125
ab4060e8	126	dev->br_port = NULL;
1da177e4 LT	127	dev_set_promiscuity(dev, -1);
1da177e4 LT	128
4433f420 SH	129	cancel_delayed_work(&p->carrier_check);
	130	flush_scheduled_work();
	131
1da177e4 LT	132	spin_lock_bh(&br->lock);
	133	br_stp_disable_port(p);
	134	spin_unlock_bh(&br->lock);
	135
	136	br_fdb_delete_by_port(br, p);
	137
	138	list_del_rcu(&p->list);
	139
	140	del_timer_sync(&p->message_age_timer);
	141	del_timer_sync(&p->forward_delay_timer);
	142	del_timer_sync(&p->hold_timer);
	143
	144	call_rcu(&p->rcu, destroy_nbp_rcu);
	145	}
	146
	147	/* called with RTNL */
	148	static void del_br(struct net_bridge *br)
	149	{
	150	struct net_bridge_port p, n;
	151
	152	list_for_each_entry_safe(p, n, &br->port_list, list) {
	153	br_sysfs_removeif(p);
	154	del_nbp(p);
	155	}
	156
	157	del_timer_sync(&br->gc_timer);
	158
	159	br_sysfs_delbr(br->dev);
	160	unregister_netdevice(br->dev);
	161	}
	162
	163	static struct net_device new_bridge_dev(const char name)
	164	{
	165	struct net_bridge *br;
	166	struct net_device *dev;
	167
	168	dev = alloc_netdev(sizeof(struct net_bridge), name,
	169	br_dev_setup);
	170
	171	if (!dev)
	172	return NULL;
	173
	174	br = netdev_priv(dev);
	175	br->dev = dev;
	176
	177	spin_lock_init(&br->lock);
	178	INIT_LIST_HEAD(&br->port_list);
	179	spin_lock_init(&br->hash_lock);
	180
	181	br->bridge_id.prio[0] = 0x80;
	182	br->bridge_id.prio[1] = 0x00;
	183	memset(br->bridge_id.addr, 0, ETH_ALEN);
	184
edb5e46f	185	br->feature_mask = dev->features;
1da177e4 LT	186	br->stp_enabled = 0;
	187	br->designated_root = br->bridge_id;
	188	br->root_path_cost = 0;
	189	br->root_port = 0;
	190	br->bridge_max_age = br->max_age = 20 * HZ;
	191	br->bridge_hello_time = br->hello_time = 2 * HZ;
	192	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	193	br->topology_change = 0;
	194	br->topology_change_detected = 0;
	195	br->ageing_time = 300 * HZ;
	196	INIT_LIST_HEAD(&br->age_list);
	197
	198	br_stp_timer_init(br);
	199
	200	return dev;
	201	}
	202
	203	/* find an available port number */
	204	static int find_portno(struct net_bridge *br)
	205	{
	206	int index;
	207	struct net_bridge_port *p;
	208	unsigned long *inuse;
	209
	210	inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long),
	211	GFP_KERNEL);
	212	if (!inuse)
	213	return -ENOMEM;
	214
	215	memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long));
	216	set_bit(0, inuse); /* zero is reserved */
	217	list_for_each_entry(p, &br->port_list, list) {
	218	set_bit(p->port_no, inuse);
	219	}
	220	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	221	kfree(inuse);
	222
	223	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	224	}
	225
4433f420	226	/* called with RTNL but without bridge lock */
1da177e4	227	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	228	struct net_device *dev)
1da177e4 LT	229	{
	230	int index;
	231	struct net_bridge_port *p;
	232
	233	index = find_portno(br);
	234	if (index < 0)
	235	return ERR_PTR(index);
	236
	237	p = kmalloc(sizeof(*p), GFP_KERNEL);
	238	if (p == NULL)
	239	return ERR_PTR(-ENOMEM);
	240
	241	memset(p, 0, sizeof(*p));
	242	p->br = br;
	243	dev_hold(dev);
	244	p->dev = dev;
4433f420	245	p->path_cost = port_cost(dev);
1da177e4 LT	246	p->priority = 0x8000 >> BR_PORT_BITS;
	247	dev->br_port = p;
	248	p->port_no = index;
	249	br_init_port(p);
	250	p->state = BR_STATE_DISABLED;
4433f420	251	INIT_WORK(&p->carrier_check, port_carrier_check, p);
1da177e4 LT	252	kobject_init(&p->kobj);
	253
	254	return p;
	255	}
	256
	257	int br_add_bridge(const char *name)
	258	{
	259	struct net_device *dev;
	260	int ret;
	261
	262	dev = new_bridge_dev(name);
	263	if (!dev)
	264	return -ENOMEM;
	265
	266	rtnl_lock();
	267	if (strchr(dev->name, '%')) {
	268	ret = dev_alloc_name(dev, dev->name);
	269	if (ret < 0)
	270	goto err1;
	271	}
	272
	273	ret = register_netdevice(dev);
	274	if (ret)
	275	goto err2;
	276
	277	/* network device kobject is not setup until
	278	* after rtnl_unlock does it's hotplug magic.
	279	* so hold reference to avoid race.
	280	*/
	281	dev_hold(dev);
	282	rtnl_unlock();
	283
	284	ret = br_sysfs_addbr(dev);
	285	dev_put(dev);
	286
	287	if (ret)
	288	unregister_netdev(dev);
	289	out:
	290	return ret;
	291
	292	err2:
	293	free_netdev(dev);
	294	err1:
	295	rtnl_unlock();
	296	goto out;
	297	}
	298
	299	int br_del_bridge(const char *name)
	300	{
	301	struct net_device *dev;
	302	int ret = 0;
	303
	304	rtnl_lock();
	305	dev = __dev_get_by_name(name);
	306	if (dev == NULL)
	307	ret = -ENXIO; /* Could not find device */
	308
	309	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	310	/* Attempt to delete non bridge device! */
	311	ret = -EPERM;
	312	}
	313
	314	else if (dev->flags & IFF_UP) {
	315	/* Not shutdown yet. */
316	ret = -EBUSY;
317	}
318
319	else
320	del_br(netdev_priv(dev));
321
322	rtnl_unlock();
323	return ret;
324	}
325
326	/* Mtu of the bridge pseudo-device 1500 or the minimum of the ports */
327	int br_min_mtu(const struct net_bridge *br)
328	{
329	const struct net_bridge_port *p;
330	int mtu = 0;
331
332	ASSERT_RTNL();
333
334	if (list_empty(&br->port_list))
335	mtu = 1500;
336	else {
337	list_for_each_entry(p, &br->port_list, list) {
338	if (!mtu \|\| p->dev->mtu < mtu)
339	mtu = p->dev->mtu;
340	}
341	}
342	return mtu;
343	}
344
81d35307 SH	345	/*
	346	* Recomputes features using slave's features
	347	*/
	348	void br_features_recompute(struct net_bridge *br)
	349	{
	350	struct net_bridge_port *p;
	351	unsigned long features, checksum;
	352
edb5e46f SH	353	features = br->feature_mask &~ NETIF_F_IP_CSUM;
edb5e46f SH	354	checksum = br->feature_mask & NETIF_F_IP_CSUM;
81d35307 SH	355
	356	list_for_each_entry(p, &br->port_list, list) {
	357	if (!(p->dev->features
	358	& (NETIF_F_IP_CSUM\|NETIF_F_NO_CSUM\|NETIF_F_HW_CSUM)))
	359	checksum = 0;
	360	features &= p->dev->features;
	361	}
	362
	363	br->dev->features = features \| checksum \| NETIF_F_LLTX;
	364	}
	365
1da177e4 LT	366	/* called with RTNL */
	367	int br_add_if(struct net_bridge br, struct net_device dev)
	368	{
	369	struct net_bridge_port *p;
	370	int err = 0;
	371
	372	if (dev->flags & IFF_LOOPBACK \|\| dev->type != ARPHRD_ETHER)
	373	return -EINVAL;
	374
	375	if (dev->hard_start_xmit == br_dev_xmit)
	376	return -ELOOP;
	377
	378	if (dev->br_port != NULL)
	379	return -EBUSY;
	380
4433f420	381	if (IS_ERR(p = new_nbp(br, dev)))
1da177e4 LT	382	return PTR_ERR(p);
	383
	384	if ((err = br_fdb_insert(br, p, dev->dev_addr)))
	385	destroy_nbp(p);
	386
	387	else if ((err = br_sysfs_addif(p)))
	388	del_nbp(p);
	389	else {
	390	dev_set_promiscuity(dev, 1);
	391
	392	list_add_rcu(&p->list, &br->port_list);
	393
	394	spin_lock_bh(&br->lock);
	395	br_stp_recalculate_bridge_id(br);
133747e8	396	br_features_recompute(br);
1da177e4 LT	397	if ((br->dev->flags & IFF_UP)
	398	&& (dev->flags & IFF_UP) && netif_carrier_ok(dev))
	399	br_stp_enable_port(p);
	400	spin_unlock_bh(&br->lock);
	401
	402	dev_set_mtu(br->dev, br_min_mtu(br));
	403	}
	404
	405	return err;
	406	}
	407
	408	/* called with RTNL */
	409	int br_del_if(struct net_bridge br, struct net_device dev)
	410	{
	411	struct net_bridge_port *p = dev->br_port;
	412
	413	if (!p \|\| p->br != br)
	414	return -EINVAL;
	415
	416	br_sysfs_removeif(p);
	417	del_nbp(p);
	418
	419	spin_lock_bh(&br->lock);
	420	br_stp_recalculate_bridge_id(br);
81d35307	421	br_features_recompute(br);
1da177e4 LT	422	spin_unlock_bh(&br->lock);
	423
	424	return 0;
	425	}
	426
	427	void __exit br_cleanup_bridges(void)
	428	{
	429	struct net_device dev, nxt;
	430
	431	rtnl_lock();
	432	for (dev = dev_base; dev; dev = nxt) {
	433	nxt = dev->next;
	434	if (dev->priv_flags & IFF_EBRIDGE)
	435	del_br(dev->priv);
	436	}
	437	rtnl_unlock();
	438
	439	}