madwifi: improve beacon miss handling to increase the reliability of STA mode links

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11798 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/madwifi/patches/361-bmiss_handling.patch b/package/madwifi/patches/361-bmiss_handling.patch
new file mode 100644 (file)
index 0000000..814a916
--- /dev/null
+++ b/package/madwifi/patches/361-bmiss_handling.patch
@@ -0,0 +1,102 @@
+Improve the beacon miss handling. Instead of just dropping the connection,
+send a directed probe request to the AP to see if it's still responding.
+Schedule a software beacon miss timer in this case, which adds a timeout
+for the APs probe response.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/net80211/ieee80211_input.c
++++ b/net80211/ieee80211_input.c
+@@ -3398,12 +3398,17 @@
+                       }
+ 
+                       /* WDS/Repeater: re-schedule software beacon timer for 
+-                       * STA. */
+-                      if ((vap->iv_state == IEEE80211_S_RUN) &&
+-                          (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
+-                              mod_timer(&vap->iv_swbmiss, 
++                       * STA. Reset consecutive bmiss counter as well */
++                      IEEE80211_LOCK_IRQ(ic);
++                      if (vap->iv_state == IEEE80211_S_RUN) {
++                              vap->iv_bmiss_count = 0;
++                              if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
++                                      mod_timer(&vap->iv_swbmiss,
+                                               jiffies + vap->iv_swbmiss_period);
++                              else
++                                      del_timer(&vap->iv_swbmiss);
+                       }
++                      IEEE80211_UNLOCK_IRQ(ic);
+ 
+                       /* If scanning, pass the info to the scan module.
+                        * Otherwise, check if it's the right time to do
+--- a/net80211/ieee80211_proto.c
++++ b/net80211/ieee80211_proto.c
+@@ -1209,6 +1209,8 @@
+       }
+       /* XXX locking */
+       TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
++              int count;
++
+               IEEE80211_DPRINTF(vap,
+                       IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
+                       "%s\n", "beacon miss");
+@@ -1221,6 +1223,29 @@
+               if (vap->iv_opmode != IEEE80211_M_STA ||
+                   vap->iv_state != IEEE80211_S_RUN)
+                       continue;
++
++              IEEE80211_LOCK_IRQ(ic);
++              count = vap->iv_bmiss_count++;
++              if (count) {
++                      /* if the counter was already above zero, reset it
++                       * here, since we're going to do the bmiss handling
++                       * in any case */
++                      vap->iv_bmiss_count = 0;
++              } else {
++                      /* schedule the software beacon miss timer, it will be
++                       * cancelled, if the probe request is acked */
++                      mod_timer(&vap->iv_swbmiss, jiffies + vap->iv_swbmiss_period);
++              }
++              IEEE80211_UNLOCK_IRQ(ic);
++
++              if (!count) {
++                      ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
++                              vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
++                              vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen,
++                              NULL, 0);
++                      continue;
++              }
++
+               if (ic->ic_roaming == IEEE80211_ROAMING_AUTO) {
+ #ifdef ATH_SUPERG_DYNTURBO
+                       /* 
+@@ -1617,14 +1642,14 @@
+               }
+ 
+               /* WDS/Repeater: Start software beacon timer for STA */
++              vap->iv_swbmiss.function = ieee80211_sta_swbmiss;
++              vap->iv_swbmiss.data = (unsigned long) vap;
++              vap->iv_swbmiss_period = IEEE80211_TU_TO_JIFFIES(
++                      vap->iv_ic->ic_bmissthreshold * ni->ni_intval);
++
+               if (ostate != IEEE80211_S_RUN &&
+                   (vap->iv_opmode == IEEE80211_M_STA &&
+                    vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
+-                      vap->iv_swbmiss.function = ieee80211_sta_swbmiss;
+-                      vap->iv_swbmiss.data = (unsigned long) vap;
+-                      vap->iv_swbmiss_period = IEEE80211_TU_TO_JIFFIES(
+-                              vap->iv_ic->ic_bmissthreshold * ni->ni_intval);
+-
+                       mod_timer(&vap->iv_swbmiss, jiffies + vap->iv_swbmiss_period);
+               }
+ 
+--- a/net80211/ieee80211_var.h
++++ b/net80211/ieee80211_var.h
+@@ -282,6 +282,7 @@
+ 
+       struct timer_list iv_swbmiss;                   /* software beacon miss timer */
+       u_int16_t iv_swbmiss_period;                    /* software beacon miss timer period */
++      u_int16_t iv_bmiss_count;                       /* consecutive beacon miss counter */
+       struct ieee80211_nsparams iv_nsparams;          /* new state parameters for tasklet for stajoin1 */
+       struct IEEE80211_TQ_STRUCT iv_stajoin1tq;       /* tasklet for newstate action called from stajoin1tq */
+       unsigned int iv_nsdone;                         /* Done with scheduled newstate tasklet */