mac80211: Avoid filling up mesh preq queue with redundant requests

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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>

...

This commit is contained in:

Javier Cardona 2011-11-03 21:11:10 -07:00 • committed by John W. Linville

parent 7e1e386421

commit f3011cf9de

2 changed files with 16 additions and 2 deletions

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3

net/mac80211/mesh.h

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15

net/mac80211/mesh_hwmp.c

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