[linux-next] LinuxNextTracking branch, master, updated. next-20140115

batman at open-mesh.org batman at open-mesh.org
Thu Jan 16 00:19:56 CET 2014


The following commit has been merged in the master branch:
commit c039876892e3247928ce5ad3d0ba46aee7d7099a
Author: Simon Wunderlich <simon at open-mesh.com>
Date:   Wed Nov 13 19:14:48 2013 +0100

    batman-adv: add WiFi penalty
    
    If the same interface is used for sending and receiving, there might be
    throughput degradation on half-duplex interfaces such as WiFi. Add a
    penalty if the same interface is used to reflect this problem in the
    metric. At the same time, change the hop penalty from 30 to 15 so there
    will be no change for single wifi mesh network. the effective hop
    penalty will stay at 30 due to the new wifi penalty for these networks.
    
    Signed-off-by: Simon Wunderlich <simon at open-mesh.com>
    Signed-off-by: Marek Lindner <mareklindner at neomailbox.ch>
    Signed-off-by: Antonio Quartulli <antonio at meshcoding.com>

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 1f9fe42..789aaa9 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -1088,6 +1088,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
 	unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
 	int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
 	unsigned int combined_tq;
+	int tq_iface_penalty;
 
 	/* find corresponding one hop neighbor */
 	rcu_read_lock();
@@ -1169,15 +1170,31 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
 	inv_asym_penalty /= neigh_rq_max_cube;
 	tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
 
-	combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
-	combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
+	/* penalize if the OGM is forwarded on the same interface. WiFi
+	 * interfaces and other half duplex devices suffer from throughput
+	 * drops as they can't send and receive at the same time.
+	 */
+	tq_iface_penalty = BATADV_TQ_MAX_VALUE;
+	if (if_outgoing && (if_incoming == if_outgoing) &&
+	    batadv_is_wifi_netdev(if_outgoing->net_dev))
+		tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
+						      bat_priv);
+
+	combined_tq = batadv_ogm_packet->tq *
+		      tq_own *
+		      tq_asym_penalty *
+		      tq_iface_penalty;
+	combined_tq /= BATADV_TQ_MAX_VALUE *
+		       BATADV_TQ_MAX_VALUE *
+		       BATADV_TQ_MAX_VALUE;
 	batadv_ogm_packet->tq = combined_tq;
 
 	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
-		   "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
+		   "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
 		   orig_node->orig, orig_neigh_node->orig, total_count,
-		   neigh_rq_count, tq_own,
-		   tq_asym_penalty, batadv_ogm_packet->tq);
+		   neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
+		   batadv_ogm_packet->tq, if_incoming->net_dev->name,
+		   if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
 
 	/* if link has the minimum required transmission quality
 	 * consider it bidirectional
diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h
index 8d4304b..ccd42c2 100644
--- a/net/batman-adv/hard-interface.h
+++ b/net/batman-adv/hard-interface.h
@@ -40,6 +40,7 @@ enum batadv_hard_if_cleanup {
 extern struct notifier_block batadv_hard_if_notifier;
 
 bool batadv_is_wifi_netdev(struct net_device *net_device);
+bool batadv_is_wifi_iface(int ifindex);
 struct batadv_hard_iface*
 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index c50f643..2dc2270 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -697,7 +697,7 @@ static int batadv_softif_init_late(struct net_device *dev)
 	atomic_set(&bat_priv->gw.bandwidth_down, 100);
 	atomic_set(&bat_priv->gw.bandwidth_up, 20);
 	atomic_set(&bat_priv->orig_interval, 1000);
-	atomic_set(&bat_priv->hop_penalty, 30);
+	atomic_set(&bat_priv->hop_penalty, 15);
 #ifdef CONFIG_BATMAN_ADV_DEBUG
 	atomic_set(&bat_priv->log_level, 0);
 #endif

-- 
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