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/*
* Copyright (c) 2007-2012 Nicira, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/version.h>
/*
* Sysfs attributes of bridge for Open vSwitch
*
* This has been shamelessly copied from the kernel sources.
*/
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/rtnetlink.h>
#include <linux/version.h>
#include "dp_sysfs.h"
#include "datapath.h"
#include "vport-internal_dev.h"
#ifdef CONFIG_SYSFS
/* Hack to attempt to build on more platforms. */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)
#define INTERNAL_DEVICE_ATTR CLASS_DEVICE_ATTR
#define DEVICE_PARAMS struct class_device *d
#define DEVICE_ARGS d
#define DEV_ATTR(NAME) class_device_attr_##NAME
#else
#define INTERNAL_DEVICE_ATTR DEVICE_ATTR
#define DEVICE_PARAMS struct device *d, struct device_attribute *attr
#define DEVICE_ARGS d, attr
#define DEV_ATTR(NAME) dev_attr_##NAME
#endif
static struct datapath *sysfs_get_dp(struct net_device *netdev)
{
struct vport *vport = ovs_internal_dev_get_vport(netdev);
return vport ? vport->dp : NULL;
}
/*
* Common code for storing bridge parameters.
*/
static ssize_t store_bridge_parm(DEVICE_PARAMS,
const char *buf, size_t len,
void (*set)(struct datapath *, unsigned long))
{
char *endp;
unsigned long val;
ssize_t result = len;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
val = simple_strtoul(buf, &endp, 0);
if (endp == buf)
return -EINVAL;
/* xxx We use a default value of 0 for all fields. If the caller is
* xxx attempting to set the value to our default, just silently
* xxx ignore the request.
*/
if (val != 0) {
struct datapath *dp;
rcu_read_lock();
dp = sysfs_get_dp(to_net_dev(d));
if (dp)
pr_warning("%s: xxx writing dp parms not supported yet!\n",
ovs_dp_name(dp));
else
result = -ENODEV;
rcu_read_unlock();
}
return result;
}
static ssize_t show_forward_delay(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static void set_forward_delay(struct datapath *dp, unsigned long val)
{
pr_info("%s: xxx attempt to set_forward_delay()\n", ovs_dp_name(dp));
}
static ssize_t store_forward_delay(DEVICE_PARAMS,
const char *buf, size_t len)
{
return store_bridge_parm(DEVICE_ARGS, buf, len, set_forward_delay);
}
static INTERNAL_DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
show_forward_delay, store_forward_delay);
static ssize_t show_hello_time(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static void set_hello_time(struct datapath *dp, unsigned long val)
{
pr_info("%s: xxx attempt to set_hello_time()\n", ovs_dp_name(dp));
}
static ssize_t store_hello_time(DEVICE_PARAMS,
const char *buf,
size_t len)
{
return store_bridge_parm(DEVICE_ARGS, buf, len, set_hello_time);
}
static INTERNAL_DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
store_hello_time);
static ssize_t show_max_age(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static void set_max_age(struct datapath *dp, unsigned long val)
{
pr_info("%s: xxx attempt to set_max_age()\n", ovs_dp_name(dp));
}
static ssize_t store_max_age(DEVICE_PARAMS,
const char *buf, size_t len)
{
return store_bridge_parm(DEVICE_ARGS, buf, len, set_max_age);
}
static INTERNAL_DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);
static ssize_t show_ageing_time(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static void set_ageing_time(struct datapath *dp, unsigned long val)
{
pr_info("%s: xxx attempt to set_ageing_time()\n", ovs_dp_name(dp));
}
static ssize_t store_ageing_time(DEVICE_PARAMS,
const char *buf, size_t len)
{
return store_bridge_parm(DEVICE_ARGS, buf, len, set_ageing_time);
}
static INTERNAL_DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
store_ageing_time);
static ssize_t show_stp_state(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static ssize_t store_stp_state(DEVICE_PARAMS,
const char *buf,
size_t len)
{
struct datapath *dp;
ssize_t result = len;
rcu_read_lock();
dp = sysfs_get_dp(to_net_dev(d));
if (dp)
pr_info("%s: xxx attempt to set_stp_state()\n", ovs_dp_name(dp));
else
result = -ENODEV;
rcu_read_unlock();
return result;
}
static INTERNAL_DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
store_stp_state);
static ssize_t show_priority(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static void set_priority(struct datapath *dp, unsigned long val)
{
pr_info("%s: xxx attempt to set_priority()\n", ovs_dp_name(dp));
}
static ssize_t store_priority(DEVICE_PARAMS,
const char *buf, size_t len)
{
return store_bridge_parm(DEVICE_ARGS, buf, len, set_priority);
}
static INTERNAL_DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
static ssize_t show_root_id(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "0000.010203040506\n");
}
static INTERNAL_DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
static ssize_t show_bridge_id(DEVICE_PARAMS, char *buf)
{
struct vport *vport;
ssize_t result;
rcu_read_lock();
vport = ovs_internal_dev_get_vport(to_net_dev(d));
if (vport) {
const unsigned char *addr;
addr = vport->ops->get_addr(vport);
result = sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
0, 0, addr[0], addr[1], addr[2], addr[3],
addr[4], addr[5]);
} else
result = -ENODEV;
rcu_read_unlock();
return result;
}
static INTERNAL_DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
static ssize_t show_root_port(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
static ssize_t show_root_path_cost(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
static ssize_t show_topology_change(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
static ssize_t show_topology_change_detected(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(topology_change_detected, S_IRUGO,
show_topology_change_detected, NULL);
static ssize_t show_hello_timer(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
static ssize_t show_tcn_timer(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
static ssize_t show_topology_change_timer(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
NULL);
static ssize_t show_gc_timer(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static INTERNAL_DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
static ssize_t show_group_addr(DEVICE_PARAMS, char *buf)
{
return sprintf(buf, "00:01:02:03:04:05\n");
}
static ssize_t store_group_addr(DEVICE_PARAMS,
const char *buf, size_t len)
{
struct datapath *dp;
ssize_t result = len;
rcu_read_lock();
dp = sysfs_get_dp(to_net_dev(d));
if (dp)
pr_info("%s: xxx attempt to store_group_addr()\n",
ovs_dp_name(dp));
else
result = -ENODEV;
rcu_read_unlock();
return result;
}
static INTERNAL_DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
show_group_addr, store_group_addr);
static struct attribute *bridge_attrs[] = {
&DEV_ATTR(forward_delay).attr,
&DEV_ATTR(hello_time).attr,
&DEV_ATTR(max_age).attr,
&DEV_ATTR(ageing_time).attr,
&DEV_ATTR(stp_state).attr,
&DEV_ATTR(priority).attr,
&DEV_ATTR(bridge_id).attr,
&DEV_ATTR(root_id).attr,
&DEV_ATTR(root_path_cost).attr,
&DEV_ATTR(root_port).attr,
&DEV_ATTR(topology_change).attr,
&DEV_ATTR(topology_change_detected).attr,
&DEV_ATTR(hello_timer).attr,
&DEV_ATTR(tcn_timer).attr,
&DEV_ATTR(topology_change_timer).attr,
&DEV_ATTR(gc_timer).attr,
&DEV_ATTR(group_addr).attr,
NULL
};
static struct attribute_group bridge_group = {
.name = SYSFS_BRIDGE_ATTR, /* "bridge" */
.attrs = bridge_attrs,
};
/*
* Add entries in sysfs onto the existing network class device
* for the bridge.
* Adds a attribute group "bridge" containing tuning parameters.
* Sub directory to hold links to interfaces.
*
* Note: the ifobj exists only to be a subdirectory
* to hold links. The ifobj exists in the same data structure
* as its parent the bridge so reference counting works.
*/
int ovs_dp_sysfs_add_dp(struct datapath *dp)
{
struct vport *vport = ovs_vport_rtnl(dp, OVSP_LOCAL);
struct kobject *kobj = vport->ops->get_kobj(vport);
int err;
#ifdef CONFIG_NET_NS
/* Due to bug in 2.6.32 kernel, sysfs_create_group() could panic
* in other namespace than init_net. Following check is to avoid it. */
if (!kobj->sd)
return -ENOENT;
#endif
/* Create /sys/class/net/<devname>/bridge directory. */
err = sysfs_create_group(kobj, &bridge_group);
if (err) {
pr_info("%s: can't create group %s/%s\n",
__func__, ovs_dp_name(dp), bridge_group.name);
goto out1;
}
/* Create /sys/class/net/<devname>/brif directory. */
err = kobject_add(&dp->ifobj, kobj, SYSFS_BRIDGE_PORT_SUBDIR);
if (err) {
pr_info("%s: can't add kobject (directory) %s/%s\n",
__func__, ovs_dp_name(dp), kobject_name(&dp->ifobj));
goto out2;
}
kobject_uevent(&dp->ifobj, KOBJ_ADD);
return 0;
out2:
sysfs_remove_group(kobj, &bridge_group);
out1:
return err;
}
int ovs_dp_sysfs_del_dp(struct datapath *dp)
{
struct vport *vport = ovs_vport_rtnl(dp, OVSP_LOCAL);
struct kobject *kobj = vport->ops->get_kobj(vport);
#ifdef CONFIG_NET_NS
if (!kobj->sd)
return 0;
#endif
kobject_del(&dp->ifobj);
sysfs_remove_group(kobj, &bridge_group);
return 0;
}
#else /* !CONFIG_SYSFS */
int ovs_dp_sysfs_add_dp(struct datapath *dp) { return 0; }
int ovs_dp_sysfs_del_dp(struct datapath *dp) { return 0; }
int dp_sysfs_add_if(struct vport *p) { return 0; }
int dp_sysfs_del_if(struct vport *p) { return 0; }
#endif /* !CONFIG_SYSFS */
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