diff options
| author | Felix Fietkau <nbd@openwrt.org> | 2010-11-19 22:55:38 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-11-24 16:19:34 -0500 |
| commit | 7ccc8bd7593634d827e8bc55898a5038e29848b5 (patch) | |
| tree | c01c231a2f7448be34796c4c11358ffec42225aa /net/mac80211 | |
| parent | c8a7972c3b3633bf90daf50b135665d8ca4838c4 (diff) | |
| download | lwn-7ccc8bd7593634d827e8bc55898a5038e29848b5.tar.gz lwn-7ccc8bd7593634d827e8bc55898a5038e29848b5.zip | |
mac80211: calculate beacon loss time accurately
Instead of using a fixed 2 second timeout, calculate beacon loss interval
from the advertised beacon interval and a frame count. With this beacon
loss happens after N (default 7) consecutive frames are missed which
for a typical setup (100TU beacon interval) is ~700ms (or ~1/3 previous).
Signed-off-by: Sam Leffler <sleffler@chromium.org>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
| -rw-r--r-- | net/mac80211/ieee80211_i.h | 1 | ||||
| -rw-r--r-- | net/mac80211/mlme.c | 16 |
2 files changed, 13 insertions, 4 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 3598abf21844..ff7bc307827b 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -349,6 +349,7 @@ struct ieee80211_if_managed { struct work_struct chswitch_work; struct work_struct beacon_connection_loss_work; + unsigned long beacon_timeout; unsigned long probe_timeout; int probe_send_count; diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 84e24df234e2..729aba49cf98 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -31,10 +31,15 @@ #define IEEE80211_MAX_PROBE_TRIES 5 /* - * beacon loss detection timeout - * XXX: should depend on beacon interval + * Beacon loss timeout is calculated as N frames times the + * advertised beacon interval. This may need to be somewhat + * higher than what hardware might detect to account for + * delays in the host processing frames. But since we also + * probe on beacon miss before declaring the connection lost + * default to what we want. */ -#define IEEE80211_BEACON_LOSS_TIME (2 * HZ) +#define IEEE80211_BEACON_LOSS_COUNT 7 + /* * Time the connection can be idle before we probe * it to see if we can still talk to the AP. @@ -121,7 +126,7 @@ void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) return; mod_timer(&sdata->u.mgd.bcn_mon_timer, - round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME)); + round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); } void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) @@ -871,6 +876,9 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, bss_info_changed |= ieee80211_handle_bss_capability(sdata, cbss->capability, bss->has_erp_value, bss->erp_value); + sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( + IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); + sdata->u.mgd.associated = cbss; memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); |