[ovs.git] / datapath / dp_sysfs_if.c

/*
 * Copyright (c) 2009, 2010 Nicira Networks.
 * Distributed under the terms of the GNU GPL version 2.
 *
 * Significant portions of this file may be copied from parts of the Linux
 * kernel, by Linus Torvalds and others.
 */

/*
 *	Sysfs attributes of bridge ports for Open vSwitch
 *
 *  This has been shamelessly copied from the kernel sources.
 */

#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>

#include "datapath.h"
#include "dp_sysfs.h"
#include "vport.h"

#ifdef CONFIG_SYSFS

struct brport_attribute {
	struct attribute	attr;
	ssize_t (*show)(struct dp_port *, char *);
	ssize_t (*store)(struct dp_port *, unsigned long);
};

#define BRPORT_ATTR(_name,_mode,_show,_store)		        \
struct brport_attribute brport_attr_##_name = { 	        \
	.attr = {.name = __stringify(_name), 			\
		 .mode = _mode, 				\
		 .owner = THIS_MODULE, },			\
	.show	= _show,					\
	.store	= _store,					\
};

static ssize_t show_path_cost(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "%d\n", p->path_cost);
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static ssize_t store_path_cost(struct dp_port *p, unsigned long v)
{
#if 0
	br_stp_set_path_cost(p, v);
#endif
	return 0;
}
static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
		   show_path_cost, store_path_cost);

static ssize_t show_priority(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "%d\n", p->priority);
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static ssize_t store_priority(struct dp_port *p, unsigned long v)
{
#if 0
	if (v >= (1<<(16-BR_PORT_BITS)))
		return -ERANGE;
	br_stp_set_port_priority(p, v);
#endif
	return 0;
}
static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
			 show_priority, store_priority);

static ssize_t show_designated_root(struct dp_port *p, char *buf)
{
#if 0
	return br_show_bridge_id(buf, &p->designated_root);
#else
	return sprintf(buf, "0000.010203040506\n");
#endif
}
static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);

static ssize_t show_designated_bridge(struct dp_port *p, char *buf)
{
#if 0
	return br_show_bridge_id(buf, &p->designated_bridge);
#else
	return sprintf(buf, "0000.060504030201\n");
#endif
}
static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);

static ssize_t show_designated_port(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "%d\n", p->designated_port);
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);

static ssize_t show_designated_cost(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "%d\n", p->designated_cost);
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);

static ssize_t show_port_id(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "0x%x\n", p->port_id);
#else
	return sprintf(buf, "0x%x\n", 0);
#endif
}
static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);

static ssize_t show_port_no(struct dp_port *p, char *buf)
{
	return sprintf(buf, "0x%x\n", p->port_no);
}

static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);

static ssize_t show_change_ack(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "%d\n", p->topology_change_ack);
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);

static ssize_t show_config_pending(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "%d\n", p->config_pending);
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);

static ssize_t show_port_state(struct dp_port *p, char *buf)
{
#if 0
	return sprintf(buf, "%d\n", p->state);
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);

static ssize_t show_message_age_timer(struct dp_port *p,
					    char *buf)
{
#if 0
	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);

static ssize_t show_forward_delay_timer(struct dp_port *p,
					    char *buf)
{
#if 0
	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);

static ssize_t show_hold_timer(struct dp_port *p,
					    char *buf)
{
#if 0
	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
#else
	return sprintf(buf, "%d\n", 0);
#endif
}
static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);

static struct brport_attribute *brport_attrs[] = {
	&brport_attr_path_cost,
	&brport_attr_priority,
	&brport_attr_port_id,
	&brport_attr_port_no,
	&brport_attr_designated_root,
	&brport_attr_designated_bridge,
	&brport_attr_designated_port,
	&brport_attr_designated_cost,
	&brport_attr_state,
	&brport_attr_change_ack,
	&brport_attr_config_pending,
	&brport_attr_message_age_timer,
	&brport_attr_forward_delay_timer,
	&brport_attr_hold_timer,
	NULL
};

#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
#define to_brport(obj)	container_of(obj, struct dp_port, kobj)

static ssize_t brport_show(struct kobject * kobj,
			   struct attribute * attr, char * buf)
{
	struct brport_attribute * brport_attr = to_brport_attr(attr);
	struct dp_port * p = to_brport(kobj);

	return brport_attr->show(p, buf);
}

static ssize_t brport_store(struct kobject * kobj,
			    struct attribute * attr,
			    const char * buf, size_t count)
{
	struct dp_port * p = to_brport(kobj);
#if 0
	struct brport_attribute * brport_attr = to_brport_attr(attr);
	char *endp;
	unsigned long val;
#endif
	ssize_t ret = -EINVAL;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

#if 0
	val = simple_strtoul(buf, &endp, 0);
	if (endp != buf) {
		rtnl_lock();
		if (p->dev && p->br && brport_attr->store) {
			spin_lock_bh(&p->br->lock);
			ret = brport_attr->store(p, val);
			spin_unlock_bh(&p->br->lock);
			if (ret == 0)
				ret = count;
		}
		rtnl_unlock();
	}
#else
	printk("%s: xxx writing port parms not supported yet!\n", 
	       dp_name(p->dp));
#endif
	return ret;
}

struct sysfs_ops brport_sysfs_ops = {
	.show = brport_show,
	.store = brport_store,
};

/*
 * Add sysfs entries to ethernet device added to a bridge.
 * Creates a brport subdirectory with bridge attributes.
 * Puts symlink in bridge's brport subdirectory
 */
int dp_sysfs_add_if(struct dp_port *p)
{
	struct kobject *kobj = vport_get_kobj(p->vport);
	struct datapath *dp = p->dp;
	struct brport_attribute **a;
	int err;

	/* Create /sys/class/net/<devname>/brport directory. */
	if (!kobj)
		return -ENOENT;

	err = kobject_add(&p->kobj, kobj, SYSFS_BRIDGE_PORT_ATTR);
	if (err)
		goto err;

	/* Create symlink from /sys/class/net/<devname>/brport/bridge to
	 * /sys/class/net/<bridgename>. */
	err = sysfs_create_link(&p->kobj, vport_get_kobj(dp->ports[ODPP_LOCAL]->vport),
				SYSFS_BRIDGE_PORT_LINK); /* "bridge" */
	if (err)
		goto err_del;

	/* Populate /sys/class/net/<devname>/brport directory with files. */
	for (a = brport_attrs; *a; ++a) {
		err = sysfs_create_file(&p->kobj, &((*a)->attr));
		if (err)
			goto err_del;
	}

	/* Create symlink from /sys/class/net/<bridgename>/brif/<devname> to
	 * /sys/class/net/<devname>/brport.  */
	err = sysfs_create_link(&dp->ifobj, &p->kobj, vport_get_name(p->vport));
	if (err)
		goto err_del;
	strcpy(p->linkname, vport_get_name(p->vport));

	kobject_uevent(&p->kobj, KOBJ_ADD);

	return 0;

err_del:
	kobject_del(&p->kobj);
err:
	p->linkname[0] = 0;
	return err;
}

int dp_sysfs_del_if(struct dp_port *p)
{
	if (p->linkname[0]) {
		sysfs_remove_link(&p->dp->ifobj, p->linkname);
		kobject_uevent(&p->kobj, KOBJ_REMOVE);
		kobject_del(&p->kobj);
		p->linkname[0] = '\0';
	}
	return 0;
}
#endif /* CONFIG_SYSFS */
Commit	Line	Data
a14bc59f	1	/*
f2459fe7	2	* Copyright (c) 2009, 2010 Nicira Networks.
a14bc59f BP	3	* Distributed under the terms of the GNU GPL version 2.
	4	*
	5	* Significant portions of this file may be copied from parts of the Linux
	6	* kernel, by Linus Torvalds and others.
	7	*/
	8
064af421 BP	9	/*
	10	* Sysfs attributes of bridge ports for Open vSwitch
	11	*
	12	* This has been shamelessly copied from the kernel sources.
	13	*/
	14
	15	#include <linux/capability.h>
	16	#include <linux/kernel.h>
	17	#include <linux/netdevice.h>
	18	#include <linux/if_bridge.h>
	19	#include <linux/rtnetlink.h>
	20	#include <linux/spinlock.h>
f2459fe7	21
064af421	22	#include "datapath.h"
f2459fe7 JG	23	#include "dp_sysfs.h"
f2459fe7 JG	24	#include "vport.h"
064af421	25
806e39cf	26	#ifdef CONFIG_SYSFS
064af421 BP	27
	28	struct brport_attribute {
	29	struct attribute attr;
f2459fe7 JG	30	ssize_t (show)(struct dp_port , char *);
f2459fe7 JG	31	ssize_t (store)(struct dp_port , unsigned long);
064af421 BP	32	};
	33
	34	#define BRPORT_ATTR(_name,_mode,_show,_store) \
	35	struct brport_attribute brport_attr_##_name = { \
	36	.attr = {.name = __stringify(_name), \
	37	.mode = _mode, \
	38	.owner = THIS_MODULE, }, \
	39	.show = _show, \
	40	.store = _store, \
	41	};
	42
f2459fe7	43	static ssize_t show_path_cost(struct dp_port p, char buf)
064af421 BP	44	{
	45	#if 0
	46	return sprintf(buf, "%d\n", p->path_cost);
	47	#else
	48	return sprintf(buf, "%d\n", 0);
	49	#endif
	50	}
f2459fe7	51	static ssize_t store_path_cost(struct dp_port *p, unsigned long v)
064af421 BP	52	{
	53	#if 0
	54	br_stp_set_path_cost(p, v);
	55	#endif
	56	return 0;
	57	}
	58	static BRPORT_ATTR(path_cost, S_IRUGO \| S_IWUSR,
	59	show_path_cost, store_path_cost);
	60
f2459fe7	61	static ssize_t show_priority(struct dp_port p, char buf)
064af421 BP	62	{
	63	#if 0
	64	return sprintf(buf, "%d\n", p->priority);
	65	#else
	66	return sprintf(buf, "%d\n", 0);
	67	#endif
	68	}
f2459fe7	69	static ssize_t store_priority(struct dp_port *p, unsigned long v)
064af421 BP	70	{
	71	#if 0
	72	if (v >= (1<<(16-BR_PORT_BITS)))
	73	return -ERANGE;
	74	br_stp_set_port_priority(p, v);
	75	#endif
	76	return 0;
	77	}
	78	static BRPORT_ATTR(priority, S_IRUGO \| S_IWUSR,
	79	show_priority, store_priority);
	80
f2459fe7	81	static ssize_t show_designated_root(struct dp_port p, char buf)
064af421 BP	82	{
	83	#if 0
	84	return br_show_bridge_id(buf, &p->designated_root);
	85	#else
	86	return sprintf(buf, "0000.010203040506\n");
	87	#endif
	88	}
	89	static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
	90
f2459fe7	91	static ssize_t show_designated_bridge(struct dp_port p, char buf)
064af421 BP	92	{
	93	#if 0
	94	return br_show_bridge_id(buf, &p->designated_bridge);
	95	#else
	96	return sprintf(buf, "0000.060504030201\n");
	97	#endif
	98	}
	99	static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
	100
f2459fe7	101	static ssize_t show_designated_port(struct dp_port p, char buf)
064af421 BP	102	{
	103	#if 0
	104	return sprintf(buf, "%d\n", p->designated_port);
	105	#else
	106	return sprintf(buf, "%d\n", 0);
	107	#endif
	108	}
	109	static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
	110
f2459fe7	111	static ssize_t show_designated_cost(struct dp_port p, char buf)
064af421 BP	112	{
	113	#if 0
	114	return sprintf(buf, "%d\n", p->designated_cost);
	115	#else
	116	return sprintf(buf, "%d\n", 0);
	117	#endif
	118	}
	119	static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
	120
f2459fe7	121	static ssize_t show_port_id(struct dp_port p, char buf)
064af421 BP	122	{
	123	#if 0
	124	return sprintf(buf, "0x%x\n", p->port_id);
	125	#else
	126	return sprintf(buf, "0x%x\n", 0);
	127	#endif
	128	}
	129	static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
	130
f2459fe7	131	static ssize_t show_port_no(struct dp_port p, char buf)
064af421 BP	132	{
	133	return sprintf(buf, "0x%x\n", p->port_no);
	134	}
	135
	136	static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
	137
f2459fe7	138	static ssize_t show_change_ack(struct dp_port p, char buf)
064af421 BP	139	{
	140	#if 0
	141	return sprintf(buf, "%d\n", p->topology_change_ack);
	142	#else
	143	return sprintf(buf, "%d\n", 0);
	144	#endif
	145	}
	146	static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
	147
f2459fe7	148	static ssize_t show_config_pending(struct dp_port p, char buf)
064af421 BP	149	{
	150	#if 0
	151	return sprintf(buf, "%d\n", p->config_pending);
	152	#else
	153	return sprintf(buf, "%d\n", 0);
	154	#endif
	155	}
	156	static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
	157
f2459fe7	158	static ssize_t show_port_state(struct dp_port p, char buf)
064af421 BP	159	{
	160	#if 0
	161	return sprintf(buf, "%d\n", p->state);
	162	#else
	163	return sprintf(buf, "%d\n", 0);
	164	#endif
	165	}
	166	static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
	167
f2459fe7	168	static ssize_t show_message_age_timer(struct dp_port *p,
064af421 BP	169	char *buf)
	170	{
	171	#if 0
	172	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
	173	#else
	174	return sprintf(buf, "%d\n", 0);
	175	#endif
	176	}
	177	static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
	178
f2459fe7	179	static ssize_t show_forward_delay_timer(struct dp_port *p,
064af421 BP	180	char *buf)
	181	{
	182	#if 0
	183	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
	184	#else
	185	return sprintf(buf, "%d\n", 0);
	186	#endif
	187	}
	188	static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
	189
f2459fe7	190	static ssize_t show_hold_timer(struct dp_port *p,
064af421 BP	191	char *buf)
	192	{
	193	#if 0
	194	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
	195	#else
	196	return sprintf(buf, "%d\n", 0);
	197	#endif
	198	}
	199	static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
	200
	201	static struct brport_attribute *brport_attrs[] = {
	202	&brport_attr_path_cost,
	203	&brport_attr_priority,
	204	&brport_attr_port_id,
	205	&brport_attr_port_no,
	206	&brport_attr_designated_root,
	207	&brport_attr_designated_bridge,
	208	&brport_attr_designated_port,
	209	&brport_attr_designated_cost,
	210	&brport_attr_state,
	211	&brport_attr_change_ack,
	212	&brport_attr_config_pending,
	213	&brport_attr_message_age_timer,
	214	&brport_attr_forward_delay_timer,
	215	&brport_attr_hold_timer,
	216	NULL
	217	};
	218
	219	#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
f2459fe7	220	#define to_brport(obj) container_of(obj, struct dp_port, kobj)
064af421 BP	221
	222	static ssize_t brport_show(struct kobject * kobj,
	223	struct attribute * attr, char * buf)
	224	{
	225	struct brport_attribute * brport_attr = to_brport_attr(attr);
f2459fe7	226	struct dp_port * p = to_brport(kobj);
064af421 BP	227
	228	return brport_attr->show(p, buf);
	229	}
	230
	231	static ssize_t brport_store(struct kobject * kobj,
	232	struct attribute * attr,
	233	const char * buf, size_t count)
	234	{
f2459fe7	235	struct dp_port * p = to_brport(kobj);
064af421 BP	236	#if 0
	237	struct brport_attribute * brport_attr = to_brport_attr(attr);
	238	char *endp;
	239	unsigned long val;
	240	#endif
	241	ssize_t ret = -EINVAL;
	242
	243	if (!capable(CAP_NET_ADMIN))
	244	return -EPERM;
	245
	246	#if 0
	247	val = simple_strtoul(buf, &endp, 0);
	248	if (endp != buf) {
	249	rtnl_lock();
	250	if (p->dev && p->br && brport_attr->store) {
	251	spin_lock_bh(&p->br->lock);
	252	ret = brport_attr->store(p, val);
	253	spin_unlock_bh(&p->br->lock);
	254	if (ret == 0)
	255	ret = count;
	256	}
	257	rtnl_unlock();
	258	}
	259	#else
	260	printk("%s: xxx writing port parms not supported yet!\n",
	261	dp_name(p->dp));
	262	#endif
	263	return ret;
	264	}
	265
	266	struct sysfs_ops brport_sysfs_ops = {
	267	.show = brport_show,
	268	.store = brport_store,
	269	};
	270
064af421 BP	271	/*
	272	* Add sysfs entries to ethernet device added to a bridge.
	273	* Creates a brport subdirectory with bridge attributes.
	274	* Puts symlink in bridge's brport subdirectory
	275	*/
f2459fe7	276	int dp_sysfs_add_if(struct dp_port *p)
064af421	277	{
f2459fe7	278	struct kobject *kobj = vport_get_kobj(p->vport);
064af421 BP	279	struct datapath *dp = p->dp;
	280	struct brport_attribute **a;
	281	int err;
	282
5e93df1c	283	/* Create /sys/class/net/<devname>/brport directory. */
f2459fe7 JG	284	if (!kobj)
	285	return -ENOENT;
	286
	287	err = kobject_add(&p->kobj, kobj, SYSFS_BRIDGE_PORT_ATTR);
064af421	288	if (err)
806e39cf	289	goto err;
064af421	290
5e93df1c BP	291	/* Create symlink from /sys/class/net/<devname>/brport/bridge to
5e93df1c BP	292	* /sys/class/net/<bridgename>. */
f2459fe7	293	err = sysfs_create_link(&p->kobj, vport_get_kobj(dp->ports[ODPP_LOCAL]->vport),
5e93df1c	294	SYSFS_BRIDGE_PORT_LINK); /* "bridge" */
064af421 BP	295	if (err)
	296	goto err_del;
	297
5e93df1c	298	/* Populate /sys/class/net/<devname>/brport directory with files. */
064af421 BP	299	for (a = brport_attrs; *a; ++a) {
	300	err = sysfs_create_file(&p->kobj, &((*a)->attr));
	301	if (err)
	302	goto err_del;
	303	}
	304
5e93df1c BP	305	/* Create symlink from /sys/class/net/<bridgename>/brif/<devname> to
5e93df1c BP	306	* /sys/class/net/<devname>/brport. */
f2459fe7	307	err = sysfs_create_link(&dp->ifobj, &p->kobj, vport_get_name(p->vport));
064af421 BP	308	if (err)
064af421 BP	309	goto err_del;
f2459fe7	310	strcpy(p->linkname, vport_get_name(p->vport));
064af421 BP	311
	312	kobject_uevent(&p->kobj, KOBJ_ADD);
	313
8fef8c71	314	return 0;
064af421 BP	315
	316	err_del:
	317	kobject_del(&p->kobj);
806e39cf	318	err:
8fef8c71	319	p->linkname[0] = 0;
064af421 BP	320	return err;
	321	}
	322
f2459fe7	323	int dp_sysfs_del_if(struct dp_port *p)
064af421	324	{
0515ceb3 BP	325	if (p->linkname[0]) {
0515ceb3 BP	326	sysfs_remove_link(&p->dp->ifobj, p->linkname);
58c342f6 BP	327	kobject_uevent(&p->kobj, KOBJ_REMOVE);
58c342f6 BP	328	kobject_del(&p->kobj);
8fef8c71	329	p->linkname[0] = '\0';
58c342f6	330	}
064af421 BP	331	return 0;
064af421 BP	332	}
806e39cf	333	#endif /* CONFIG_SYSFS */