From d1829fa0c380ccf48a7b96795a6d4a01698d02a6 Mon Sep 17 00:00:00 2001
From: Daniele Furlan <daniele.furlan@gmail.com>
Date: Tue, 7 Jun 2011 00:45:55 +0200
Subject: [PATCH] batman-adv: accept delayed rebroadcasts to avoid bogus
routing under heavy load
When a link is saturated (re)broadcasts of OGMs are delayed. Under heavy
load this delay may exceed the orig interval which leads to OGMs being
dropped (the code would only accept an OGM rebroadcast if it arrived
before the next OGM was broadcasted). With this patch batman-adv will
also accept delayed OGMs in order to avoid a bogus influence on the
routing metric.
Signed-off-by: Daniele Furlan <daniele.furlan@gmail.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
net/batman-adv/routing.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 368ceeba8145..934f1f2f86c6 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -698,17 +698,16 @@ void receive_bat_packet(const struct ethhdr *ethhdr,
/* neighbor has to indicate direct link and it has to
* come via the corresponding interface */
- /* if received seqno equals last send seqno save new
- * seqno for bidirectional check */
+ /* save packet seqno for bidirectional check */
if (has_directlink_flag &&
compare_eth(if_incoming->net_dev->dev_addr,
- batman_packet->orig) &&
- (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
+ batman_packet->orig)) {
offset = if_incoming->if_num * NUM_WORDS;
spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
word = &(orig_neigh_node->bcast_own[offset]);
- bit_mark(word, 0);
+ bit_mark(word,
+ if_incoming_seqno - batman_packet->seqno - 2);
orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
bit_packet_count(word);
spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
--
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