From 7f136cd491013285442ee1e7854fab1736f5757c Mon Sep 17 00:00:00 2001 From: Linus Luessing Date: Sat, 16 Jan 2016 16:40:11 +0800 Subject: batman-adv: ELP - adding sysfs parameter for elp interval This parameter can be set individually on each interface and allows the configuration of the elp interval for the link quality measurements during runtime. Usually it is desirable to set it to a higher (= slower) value on interfaces which have a more static characteristic (e.g. wired interfaces) or very dense neighbourhoods to reduce overhead. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing Signed-off-by: Marek Lindner [antonio@open-mesh.com: respin on top of the latest master] Signed-off-by: Antonio Quartulli --- Documentation/ABI/testing/sysfs-class-net-batman-adv | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'Documentation/ABI') diff --git a/Documentation/ABI/testing/sysfs-class-net-batman-adv b/Documentation/ABI/testing/sysfs-class-net-batman-adv index 7f34a95bb963..aea78db983bc 100644 --- a/Documentation/ABI/testing/sysfs-class-net-batman-adv +++ b/Documentation/ABI/testing/sysfs-class-net-batman-adv @@ -1,4 +1,11 @@ +What: /sys/class/net//batman-adv/elp_interval +Date: Feb 2014 +Contact: Linus Lüssing +Description: + Defines the interval in milliseconds in which batman + sends its probing packets for link quality measurements. + What: /sys/class/net//batman-adv/iface_status Date: May 2010 Contact: Marek Lindner @@ -12,4 +19,3 @@ Description: The /sys/class/net//batman-adv/mesh_iface file displays the batman mesh interface this currently is associated with. - -- cgit v1.2.3 From 0b5ecc6811bd576ecc9813bbe069f2293cb1c6aa Mon Sep 17 00:00:00 2001 From: Antonio Quartulli Date: Sat, 16 Jan 2016 16:40:14 +0800 Subject: 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: Antonio Quartulli Signed-off-by: Marek Lindner --- .../ABI/testing/sysfs-class-net-batman-adv | 9 +++ net/batman-adv/bat_v.c | 6 ++ net/batman-adv/gateway_common.c | 4 +- net/batman-adv/gateway_common.h | 2 + net/batman-adv/sysfs.c | 74 ++++++++++++++++++++++ net/batman-adv/types.h | 2 + 6 files changed, 95 insertions(+), 2 deletions(-) (limited to 'Documentation/ABI') diff --git a/Documentation/ABI/testing/sysfs-class-net-batman-adv b/Documentation/ABI/testing/sysfs-class-net-batman-adv index aea78db983bc..518f6a1dbc0c 100644 --- a/Documentation/ABI/testing/sysfs-class-net-batman-adv +++ b/Documentation/ABI/testing/sysfs-class-net-batman-adv @@ -1,4 +1,13 @@ +What: /sys/class/net//batman-adv/throughput_override +Date: Feb 2014 +Contact: Antonio Quartulli +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//batman-adv/elp_interval Date: Feb 2014 Contact: Linus Lüssing diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c index b90a4dfe8ba6..d9cb5c4922c1 100644 --- a/net/batman-adv/bat_v.c +++ b/net/batman-adv/bat_v.c @@ -18,6 +18,7 @@ #include "bat_algo.h" #include "main.h" +#include #include #include @@ -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; } diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c index 5ee04f7140af..4423047889e1 100644 --- a/net/batman-adv/gateway_common.c +++ b/net/batman-adv/gateway_common.c @@ -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; diff --git a/net/batman-adv/gateway_common.h b/net/batman-adv/gateway_common.h index b58346350024..8a5e1ddf1175 100644 --- a/net/batman-adv/gateway_common.h +++ b/net/batman-adv/gateway_common.h @@ -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_ */ diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index e86014332e1c..e7cf51333a36 100644 --- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -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, }; diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index cf55cd0586b5..a6f0952d2840 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -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; }; /** -- cgit v1.2.3