[B.A.T.M.A.N.] [PATCH 09/11] batman-adv: Use local tq values determined by NDP on OGMs

["Linus Lüssing" <linus.luessing@ascom.ch>]

With this commit not the local transmit quality values determined
by the OGMs themselves are applied on received OGMs, but the local
transmit quality detemined by NDP instead. Usually the link quality
measurements of NDP are more up-to-date than the one of the OGMs, as NDP
is using a more frequent interval because NDP's packets are not being
flooded through the whole mesh.

Signed-off-by: Linus Lüssing <linus.luessing@ascom.ch>
---
 routing.c |   62 ++++++++++++++++++++++++++++--------------------------------
 1 files changed, 29 insertions(+), 33 deletions(-)

diff --git a/batman-adv/routing.c b/batman-adv/routing.c
index 947592f..8a3acfa 100644
--- a/batman-adv/routing.c
+++ b/batman-adv/routing.c
@@ -152,7 +152,7 @@ static int is_bidirectional_neigh(struct orig_node *orig_node,
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 	struct hlist_node *node;
-	unsigned char total_count;
+	uint8_t local_tq = 0, local_rq = 0;
 
 	if (orig_node == orig_neigh_node) {
 		rcu_read_lock();
@@ -199,25 +199,23 @@ static int is_bidirectional_neigh(struct orig_node *orig_node,
 			return 0;
 	}
 
-	orig_node->last_valid = jiffies;
+	/* note, bottom halves are already deactivated outside in
+	 * recv_bat_packet() */
+	spin_lock(&if_incoming->neigh_list_lock);
+	hlist_for_each_entry(neigh_node, node, &if_incoming->neigh_list,
+								list) {
+		if (!compare_orig(neigh_node->addr, orig_neigh_node->orig))
+			continue;
 
-	/* pay attention to not get a value bigger than 100 % */
-	total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
-		       neigh_node->real_packet_count ?
-		       neigh_node->real_packet_count :
-		       orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
+		orig_node->last_valid = jiffies;
+		local_tq = neigh_node->tq_avg;
+		local_rq = neigh_node->rq;
+		break;
+	}
+	spin_unlock(&if_incoming->neigh_list_lock);
 
-	/* if we have too few packets (too less data) we set tq_own to zero */
-	/* if we receive too few packets it is not considered bidirectional */
-	if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
-	    (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
-		orig_neigh_node->tq_own = 0;
-	else
-		/* neigh_node->real_packet_count is never zero as we
-		 * only purge old information when getting new
-		 * information */
-		orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
-			neigh_node->real_packet_count;
+	if (local_tq == 0)
+		return 0;
 
 	/*
 	 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
@@ -228,25 +226,22 @@ static int is_bidirectional_neigh(struct orig_node *orig_node,
 	orig_neigh_node->tq_asym_penalty =
 		TQ_MAX_VALUE -
 		(TQ_MAX_VALUE *
-		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
-		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
-		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
-		(TQ_LOCAL_WINDOW_SIZE *
-		 TQ_LOCAL_WINDOW_SIZE *
-		 TQ_LOCAL_WINDOW_SIZE);
+		 (TQ_MAX_VALUE - local_rq) *
+		 (TQ_MAX_VALUE - local_rq) *
+		 (TQ_MAX_VALUE - local_rq)) /
+		(TQ_MAX_VALUE *
+		 TQ_MAX_VALUE *
+		 TQ_MAX_VALUE);
 
-	ogm_packet->tq = ((ogm_packet->tq *
-			      orig_neigh_node->tq_own *
-			      orig_neigh_node->tq_asym_penalty) /
-			     (TQ_MAX_VALUE * TQ_MAX_VALUE));
+	ogm_packet->tq = ((ogm_packet->tq * local_tq *
+			   orig_neigh_node->tq_asym_penalty) /
+			   (TQ_MAX_VALUE * TQ_MAX_VALUE));
 
 	bat_dbg(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",
-		orig_node->orig, orig_neigh_node->orig, total_count,
-		neigh_node->real_packet_count, orig_neigh_node->tq_own,
+		"orig = %-15pM neigh = %-15pM => local tq = %3i, "
+		"local rq: %3i, asym_penalty: %3i, total tq: %3i\n",
+		orig_node->orig, orig_neigh_node->orig, local_tq, local_rq,
 		orig_neigh_node->tq_asym_penalty, ogm_packet->tq);
 
 	/* if link has the minimum required transmission quality
@@ -859,6 +854,7 @@ int recv_bat_packet(struct sk_buff *skb,
 
 	ethhdr = (struct ethhdr *)skb_mac_header(skb);
 
+	/* note, is_bidirectional_neigh() relies on deactivated bottom halves */
 	spin_lock_bh(&bat_priv->orig_hash_lock);
 	receive_aggr_bat_packet(ethhdr,
 				skb->data,
-- 
1.7.1