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authorJavier Cardona <javier@cozybit.com>2011-11-03 21:11:10 -0700
committerJohn W. Linville <linville@tuxdriver.com>2011-11-09 16:01:02 -0500
commitf3011cf9deb689bd68279c728c501a4166983c19 (patch)
tree7d9945a2934c6de78063c358a6d350af8b6a19a9 /net/mac80211/mesh.h
parent7e1e386421e2ec7804b77f2c1c8e2517e82ecb7e (diff)
mac80211: Avoid filling up mesh preq queue with redundant requests
Don't accept redundant PREQs for a given destination. This fixes a problem under high load: kernel: [20386.250913] mesh_queue_preq: 235 callbacks suppressed kernel: [20386.253335] Mesh HWMP (mesh0): PREQ node queue full kernel: [20386.253352] Mesh HWMP (mesh0): PREQ node queue full (...) The 802.11s protocol has a provision to limit the rate of path requests (PREQs) are transmitted (dot11MeshHWMPpreqMinInterval) but there was no limit on the rate at which PREQs were being queued up. There is a valid reason for queuing PREQs: this way we can even out PREQ bursts. But queueing multiple PREQs for the same destination is useless. Reported-by: Pedro Larbig <pedro.larbig@carhs.de> Signed-off-by: Javier Cardona <javier@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/mesh.h')
-rw-r--r--net/mac80211/mesh.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index 0f2c4e69e217..622cc96eb4de 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -31,6 +31,8 @@
* @MESH_PATH_FIXED: the mesh path has been manually set and should not be
* modified
* @MESH_PATH_RESOLVED: the mesh path can has been resolved
+ * @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination
+ * already queued up, waiting for the discovery process to start.
*
* MESH_PATH_RESOLVED is used by the mesh path timer to
* decide when to stop or cancel the mesh path discovery.
@@ -41,6 +43,7 @@ enum mesh_path_flags {
MESH_PATH_SN_VALID = BIT(2),
MESH_PATH_FIXED = BIT(3),
MESH_PATH_RESOLVED = BIT(4),
+ MESH_PATH_REQ_QUEUED = BIT(5),
};
/**