Commit 0b5ecc68 authored by Antonio Quartulli's avatar Antonio Quartulli Committed by Antonio Quartulli
Browse files

batman-adv: add throughput override attribute to hard_ifaces



This attribute is exported to user space to disable the link
throughput auto-detection by setting a fixed value.
The throughput override value is used when batman-adv is
computing the link throughput towards a neighbour.

If the value is set to 0 then batman-adv will try to detect
the throughput by itself.
Signed-off-by: default avatarAntonio Quartulli <antonio@open-mesh.com>
Signed-off-by: default avatarMarek Lindner <mareklindner@neomailbox.ch>
parent 9323158e
What: /sys/class/net/<iface>/batman-adv/throughput_override
Date: Feb 2014
Contact: Antonio Quartulli <antonio@meshcoding.com>
description:
Defines the throughput value to be used by B.A.T.M.A.N. V
when estimating the link throughput using this interface.
If the value is set to 0 then batman-adv will try to
estimate the throughput by itself.
What: /sys/class/net/<iface>/batman-adv/elp_interval
Date: Feb 2014
Contact: Linus Lüssing <linus.luessing@web.de>
......
......@@ -18,6 +18,7 @@
#include "bat_algo.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/cache.h>
#include <linux/init.h>
......@@ -37,6 +38,11 @@ static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface)
if (ret < 0)
batadv_v_elp_iface_disable(hard_iface);
/* enable link throughput auto-detection by setting the throughput
* override to zero
*/
atomic_set(&hard_iface->bat_v.throughput_override, 0);
return ret;
}
......
......@@ -40,8 +40,8 @@
*
* Return: false on parse error and true otherwise.
*/
static bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
const char *description, u32 *throughput)
bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
const char *description, u32 *throughput)
{
enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
u64 lthroughput;
......
......@@ -49,5 +49,7 @@ ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv);
void batadv_gw_init(struct batadv_priv *bat_priv);
void batadv_gw_free(struct batadv_priv *bat_priv);
bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
const char *description, u32 *throughput);
#endif /* _NET_BATMAN_ADV_GATEWAY_COMMON_H_ */
......@@ -917,12 +917,85 @@ static ssize_t batadv_show_iface_status(struct kobject *kobj,
return length;
}
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
/**
* batadv_store_throughput_override - parse and store throughput override
* entered by the user
* @kobj: kobject representing the private mesh sysfs directory
* @attr: the batman-adv attribute the user is interacting with
* @buff: the buffer containing the user data
* @count: number of bytes in the buffer
*
* Return: 'count' on success or a negative error code in case of failure
*/
static ssize_t batadv_store_throughput_override(struct kobject *kobj,
struct attribute *attr,
char *buff, size_t count)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
struct batadv_hard_iface *hard_iface;
u32 tp_override;
u32 old_tp_override;
bool ret;
hard_iface = batadv_hardif_get_by_netdev(net_dev);
if (!hard_iface)
return -EINVAL;
if (buff[count - 1] == '\n')
buff[count - 1] = '\0';
ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
&tp_override);
if (!ret)
return count;
old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
if (old_tp_override == tp_override)
goto out;
batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n",
"throughput_override",
old_tp_override / 10, old_tp_override % 10,
tp_override / 10, tp_override % 10);
atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
out:
batadv_hardif_put(hard_iface);
return count;
}
static ssize_t batadv_show_throughput_override(struct kobject *kobj,
struct attribute *attr,
char *buff)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
struct batadv_hard_iface *hard_iface;
u32 tp_override;
hard_iface = batadv_hardif_get_by_netdev(net_dev);
if (!hard_iface)
return -EINVAL;
tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
tp_override % 10);
}
#endif
static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
batadv_store_mesh_iface);
static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, S_IRUGO | S_IWUSR,
2 * BATADV_JITTER, INT_MAX, NULL);
static BATADV_ATTR(throughput_override, S_IRUGO | S_IWUSR,
batadv_show_throughput_override,
batadv_store_throughput_override);
#endif
static struct batadv_attribute *batadv_batman_attrs[] = {
......@@ -930,6 +1003,7 @@ static struct batadv_attribute *batadv_batman_attrs[] = {
&batadv_attr_iface_status,
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
&batadv_attr_elp_interval,
&batadv_attr_throughput_override,
#endif
NULL,
};
......
......@@ -92,12 +92,14 @@ struct batadv_hard_iface_bat_iv {
* @elp_seqno: current ELP sequence number
* @elp_skb: base skb containing the ELP message to send
* @elp_wq: workqueue used to schedule ELP transmissions
* @throughput_override: throughput override to disable link auto-detection
*/
struct batadv_hard_iface_bat_v {
atomic_t elp_interval;
atomic_t elp_seqno;
struct sk_buff *elp_skb;
struct delayed_work elp_wq;
atomic_t throughput_override;
};
/**
......
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