From dbf498fbafa2c23139d5a990e94ed78bafbbea19 Mon Sep 17 00:00:00 2001 From: Javier Cardona Date: Sat, 31 Mar 2012 11:31:32 -0700 Subject: mac80211: Implement mesh synchronization framework This patch adds MBSS extensible synchronization framework (Sec. 13.13.2 of IEEE Std. 802.11-2012). The framework is implemented via an ops table which defines the following functions: rx_bcn_presp() - this is called every time a mesh beacon is received. adjust_tbtt() - this is called immediately before a beacon is about to be transmitted. The default neighbor offset synchronization defined in the standard is implemented. We also provide template functions for vendor specific methods. When neighbor offset synchronization is active (which is the default) mesh neighbors in the same MBSS will track timing offsets to each other and compensate clock drift. In our tests we observed that this mesh synchronization implementation successfully corrected drifts between stations of ~2PPM while introducing a jitter of ~20us. It is also possible to test this framework on mac80211_hwsim simulated phys to see how it behaves under different topologies, over poor links, etc. Signed-off-by: Marco Porsch Signed-off-by: Pavel Zubarev Signed-off-by: Javier Cardona Signed-off-by: John W. Linville --- net/mac80211/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/mac80211/Makefile') diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile index 1be7a454aa7..3e9d931bba3 100644 --- a/net/mac80211/Makefile +++ b/net/mac80211/Makefile @@ -38,7 +38,8 @@ mac80211-$(CONFIG_MAC80211_MESH) += \ mesh.o \ mesh_pathtbl.o \ mesh_plink.o \ - mesh_hwmp.o + mesh_hwmp.o \ + mesh_sync.o mac80211-$(CONFIG_PM) += pm.o -- cgit v1.2.3-70-g09d2