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batman-adv: BATMAN_V: introduce per hard-iface OGMv2 queues

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In preparation for the OGMv2 packet aggregation, hold OGMv2 packets for
up to BATADV_MAX_AGGREGATION_MS milliseconds (100ms) on per
hard-interface queues, before transmitting.

This allows us to later squash multiple OGMs into a single frame
and transmission for reduced overhead.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Linus Lüssing 2019-08-04 20:54:53 +02:00 committed by Simon Wunderlich
parent 529a8f939a
commit f89255a02f
4 changed files with 173 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/batman-adv/bat_v.c
View File

@ -79,6 +79,7 @@ static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface)
static void batadv_v_iface_disable(struct batadv_hard_iface *hard_iface)
{
batadv_v_ogm_iface_disable(hard_iface);
batadv_v_elp_iface_disable(hard_iface);
}
@ -1081,6 +1082,12 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface)
*/
atomic_set(&hard_iface->bat_v.throughput_override, 0);
atomic_set(&hard_iface->bat_v.elp_interval, 500);
hard_iface->bat_v.aggr_len = 0;
skb_queue_head_init(&hard_iface->bat_v.aggr_list);
spin_lock_init(&hard_iface->bat_v.aggr_list_lock);
INIT_DELAYED_WORK(&hard_iface->bat_v.aggr_wq,
batadv_v_ogm_aggr_work);
}
/**

153
net/batman-adv/bat_v_ogm.c
View File

@ -17,12 +17,14 @@
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/random.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/types.h>
@ -76,6 +78,20 @@ struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv,
return orig_node;
}
/**
* batadv_v_ogm_start_queue_timer() - restart the OGM aggregation timer
* @hard_iface: the interface to use to send the OGM
*/
static void batadv_v_ogm_start_queue_timer(struct batadv_hard_iface *hard_iface)
{
unsigned int msecs = BATADV_MAX_AGGREGATION_MS * 1000;
/* msecs * [0.9, 1.1] */
msecs += prandom_u32() % (msecs / 5) - (msecs / 10);
queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.aggr_wq,
msecs_to_jiffies(msecs / 1000));
}
/**
* batadv_v_ogm_start_timer() - restart the OGM sending timer
* @bat_priv: the bat priv with all the soft interface information
@ -115,6 +131,104 @@ static void batadv_v_ogm_send_to_if(struct sk_buff *skb,
batadv_send_broadcast_skb(skb, hard_iface);
}
/**
* batadv_v_ogm_len() - OGMv2 packet length
* @skb: the OGM to check
*
* Return: Length of the given OGMv2 packet, including tvlv length, excluding
* ethernet header length.
*/
static unsigned int batadv_v_ogm_len(struct sk_buff *skb)
{
struct batadv_ogm2_packet *ogm_packet;
ogm_packet = (struct batadv_ogm2_packet *)skb->data;
return BATADV_OGM2_HLEN + ntohs(ogm_packet->tvlv_len);
}
/**
* batadv_v_ogm_queue_left() - check if given OGM still fits aggregation queue
* @skb: the OGM to check
* @hard_iface: the interface to use to send the OGM
*
* Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
*
* Return: True, if the given OGMv2 packet still fits, false otherwise.
*/
static bool batadv_v_ogm_queue_left(struct sk_buff *skb,
struct batadv_hard_iface *hard_iface)
{
unsigned int max = min_t(unsigned int, hard_iface->net_dev->mtu,
BATADV_MAX_AGGREGATION_BYTES);
unsigned int ogm_len = batadv_v_ogm_len(skb);
lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
return hard_iface->bat_v.aggr_len + ogm_len <= max;
}
/**
* batadv_v_ogm_aggr_list_free - free all elements in an aggregation queue
* @hard_iface: the interface holding the aggregation queue
*
* Empties the OGMv2 aggregation queue and frees all the skbs it contained.
*
* Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
*/
static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface)
{
struct sk_buff *skb;
lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list)))
kfree_skb(skb);
hard_iface->bat_v.aggr_len = 0;
}
/**
* batadv_v_ogm_aggr_send() - flush & send aggregation queue
* @hard_iface: the interface with the aggregation queue to flush
*
* Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
*/
static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface)
{
struct sk_buff *skb;
lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list))) {
hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb);
batadv_v_ogm_send_to_if(skb, hard_iface);
}
}
/**
* batadv_v_ogm_queue_on_if() - queue a batman ogm on a given interface
* @skb: the OGM to queue
* @hard_iface: the interface to queue the OGM on
*/
static void batadv_v_ogm_queue_on_if(struct sk_buff *skb,
struct batadv_hard_iface *hard_iface)
{
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
if (!atomic_read(&bat_priv->aggregated_ogms)) {
batadv_v_ogm_send_to_if(skb, hard_iface);
return;
}
spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
if (!batadv_v_ogm_queue_left(skb, hard_iface))
batadv_v_ogm_aggr_send(hard_iface);
hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb);
skb_queue_tail(&hard_iface->bat_v.aggr_list, skb);
spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
}
/**
* batadv_v_ogm_send() - periodic worker broadcasting the own OGM
* @work: work queue item
@ -210,7 +324,7 @@ static void batadv_v_ogm_send(struct work_struct *work)
break;
}
batadv_v_ogm_send_to_if(skb_tmp, hard_iface);
batadv_v_ogm_queue_on_if(skb_tmp, hard_iface);
batadv_hardif_put(hard_iface);
}
rcu_read_unlock();
@ -223,6 +337,27 @@ out:
return;
}
/**
* batadv_v_ogm_aggr_work() - OGM queue periodic task per interface
* @work: work queue item
*
* Emits aggregated OGM message in regular intervals.
*/
void batadv_v_ogm_aggr_work(struct work_struct *work)
{
struct batadv_hard_iface_bat_v *batv;
struct batadv_hard_iface *hard_iface;
batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work);
hard_iface = container_of(batv, struct batadv_hard_iface, bat_v);
spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
batadv_v_ogm_aggr_send(hard_iface);
spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
batadv_v_ogm_start_queue_timer(hard_iface);
}
/**
* batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V
* @hard_iface: the interface to prepare
@ -235,11 +370,25 @@ int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
{
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
batadv_v_ogm_start_queue_timer(hard_iface);
batadv_v_ogm_start_timer(bat_priv);
return 0;
}
/**
* batadv_v_ogm_iface_disable() - release OGM interface private resources
* @hard_iface: interface for which the resources have to be released
*/
void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
{
cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq);
spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
batadv_v_ogm_aggr_list_free(hard_iface);
spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
}
/**
* batadv_v_ogm_primary_iface_set() - set a new primary interface
* @primary_iface: the new primary interface
@ -382,7 +531,7 @@ static void batadv_v_ogm_forward(struct batadv_priv *bat_priv,
if_outgoing->net_dev->name, ntohl(ogm_forward->throughput),
ogm_forward->ttl, if_incoming->net_dev->name);
batadv_v_ogm_send_to_if(skb, if_outgoing);
batadv_v_ogm_queue_on_if(skb, if_outgoing);
out:
if (orig_ifinfo)

3
net/batman-adv/bat_v_ogm.h
View File

@ -11,10 +11,13 @@
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/workqueue.h>
int batadv_v_ogm_init(struct batadv_priv *bat_priv);
void batadv_v_ogm_free(struct batadv_priv *bat_priv);
void batadv_v_ogm_aggr_work(struct work_struct *work);
int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface);
void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface);
struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv,
const u8 *addr);
void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface);

12
net/batman-adv/types.h
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@ -117,6 +117,18 @@ struct batadv_hard_iface_bat_v {
/** @elp_wq: workqueue used to schedule ELP transmissions */
struct delayed_work elp_wq;
/** @aggr_wq: workqueue used to transmit queued OGM packets */
struct delayed_work aggr_wq;
/** @aggr_list: queue for to be aggregated OGM packets */
struct sk_buff_head aggr_list;
/** @aggr_len: size of the OGM aggregate (excluding ethernet header) */
unsigned int aggr_len;
/** @aggr_list_lock: protects aggr_list */
spinlock_t aggr_list_lock;
/**
* @throughput_override: throughput override to disable link
* auto-detection