mac80211: make beacon-loss-count configurable

On loaded systems with lots of VIFs, I see lots of beacon
timeouts, even though the connection to the AP is very
good.  Allow tuning the beacon-loss-count variable to
give the system longer to process beacons if the user
prefers.

Signed-off-by: Ben Greear <greearb@candelatech.com>
[add the number of beacons to the message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 4d383a93ea73..b86b8d4e02a8 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -56,7 +56,10 @@ MODULE_PARM_DESC(max_probe_tries,
  * probe on beacon miss before declaring the connection lost
  * default to what we want.
  */
-#define IEEE80211_BEACON_LOSS_COUNT     7
+static int beacon_loss_count = 7;
+module_param(beacon_loss_count, int, 0644);
+MODULE_PARM_DESC(beacon_loss_count,
+                 "Number of beacon intervals before we decide beacon was lost.");
 
 /*
  * Time the connection can be idle before we probe
@@ -1645,7 +1648,7 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                 bss_conf->assoc_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));
+                beacon_loss_count * bss_conf->beacon_int));
 
         sdata->u.mgd.associated = cbss;
         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
@@ -1977,7 +1980,8 @@ static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 
         if (beacon)
                 mlme_dbg_ratelimited(sdata,
-                                     "detected beacon loss from AP - probing\n");
+                                     "detected beacon loss from AP (missed %d beacons) - probing\n",
+                                     beacon_loss_count);
 
         ieee80211_cqm_rssi_notify(&sdata->vif,
                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);