diff options
| author | John W. Linville <linville@tuxdriver.com> | 2012-04-18 14:17:13 -0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-04-18 14:27:48 -0400 |
| commit | 59ef43e681d103a51c3727dad0315e093f07ec61 (patch) | |
| tree | 87f6320f1440ce3ce6c0c15ad3cef8bc98186f88 /net/mac80211/mesh_sync.c | |
| parent | 91fbe33034c184c6a60e31c2207a2f7ec2f180dc (diff) | |
| parent | b5abcf0219263f4e961dca71cbe26e06c5b0ee68 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem
Conflicts:
drivers/net/wireless/iwlwifi/iwl-testmode.c
include/net/nfc/nfc.h
net/nfc/netlink.c
net/wireless/nl80211.c
Diffstat (limited to 'net/mac80211/mesh_sync.c')
| -rw-r--r-- | net/mac80211/mesh_sync.c | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/net/mac80211/mesh_sync.c b/net/mac80211/mesh_sync.c index f78b0139856..ff60d6bcc63 100644 --- a/net/mac80211/mesh_sync.c +++ b/net/mac80211/mesh_sync.c @@ -22,7 +22,20 @@ /* This is not in the standard. It represents a tolerable tbtt drift below * which we do no TSF adjustment. */ -#define TBTT_MINIMUM_ADJUSTMENT 10 +#define TOFFSET_MINIMUM_ADJUSTMENT 10 + +/* This is not in the standard. It is a margin added to the + * Toffset setpoint to mitigate TSF overcorrection + * introduced by TSF adjustment latency. + */ +#define TOFFSET_SET_MARGIN 20 + +/* This is not in the standard. It represents the maximum Toffset jump above + * which we'll invalidate the Toffset setpoint and choose a new setpoint. This + * could be, for instance, in case a neighbor is restarted and its TSF counter + * reset. + */ +#define TOFFSET_MAXIMUM_ADJUSTMENT 30000 /* 30 ms */ struct sync_method { u8 method; @@ -156,15 +169,22 @@ static void mesh_sync_offset_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) { s64 t_clockdrift = sta->t_offset_setpoint - sta->t_offset; - - msync_dbg("STA %pM : sta->t_offset=%lld," - " sta->t_offset_setpoint=%lld," - " t_clockdrift=%lld", + msync_dbg("STA %pM : sta->t_offset=%lld, sta->t_offset_setpoint=%lld, t_clockdrift=%lld", sta->sta.addr, (long long) sta->t_offset, (long long) sta->t_offset_setpoint, (long long) t_clockdrift); + + if (t_clockdrift > TOFFSET_MAXIMUM_ADJUSTMENT || + t_clockdrift < -TOFFSET_MAXIMUM_ADJUSTMENT) { + msync_dbg("STA %pM : t_clockdrift=%lld too large, setpoint reset", + sta->sta.addr, + (long long) t_clockdrift); + clear_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN); + goto no_sync; + } + rcu_read_unlock(); spin_lock_bh(&ifmsh->sync_offset_lock); @@ -200,7 +220,7 @@ static void mesh_sync_offset_adjust_tbtt(struct ieee80211_sub_if_data *sdata) spin_lock_bh(&ifmsh->sync_offset_lock); if (ifmsh->sync_offset_clockdrift_max > - TBTT_MINIMUM_ADJUSTMENT) { + TOFFSET_MINIMUM_ADJUSTMENT) { /* Since ajusting the tsf here would * require a possibly blocking call * to the driver tsf setter, we punt |