package/madwifi/patches-r3776/326-bmiss_handling.patch

   1 Improve the beacon miss handling. Instead of just dropping the connection,
   2 send a directed probe request to the AP to see if it's still responding.
   3 Schedule a software beacon miss timer in this case, which adds a timeout
   4 for the APs probe response.
   5
   6 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   7
   8 Index: madwifi-trunk-r3776/net80211/ieee80211_input.c
   9 ===================================================================
  10 --- madwifi-trunk-r3776.orig/net80211/ieee80211_input.c 2008-07-17 04:03:07.000000000 +0200
  11 +++ madwifi-trunk-r3776/net80211/ieee80211_input.c      2008-07-17 04:06:33.000000000 +0200
  12 @@ -3369,12 +3369,17 @@
  13                         }
  14
  15                         /* WDS/Repeater: re-schedule software beacon timer for
  16 -                        * STA. */
  17 -                       if ((vap->iv_state == IEEE80211_S_RUN) &&
  18 -                           (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
  19 -                               mod_timer(&vap->iv_swbmiss,
  20 +                        * STA. Reset consecutive bmiss counter as well */
  21 +                       IEEE80211_LOCK_IRQ(ic);
  22 +                       if (vap->iv_state == IEEE80211_S_RUN) {
  23 +                               vap->iv_bmiss_count = 0;
  24 +                               if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
  25 +                                       mod_timer(&vap->iv_swbmiss,
  26                                                 jiffies + vap->iv_swbmiss_period);
  27 +                               else
  28 +                                       del_timer(&vap->iv_swbmiss);
  29                         }
  30 +                       IEEE80211_UNLOCK_IRQ(ic);
  31
  32                         /* If scanning, pass the info to the scan module.
  33                          * Otherwise, check if it's the right time to do
  34 Index: madwifi-trunk-r3776/net80211/ieee80211_proto.c
  35 ===================================================================
  36 --- madwifi-trunk-r3776.orig/net80211/ieee80211_proto.c 2008-07-17 04:06:18.000000000 +0200
  37 +++ madwifi-trunk-r3776/net80211/ieee80211_proto.c      2008-07-17 04:06:33.000000000 +0200
  38 @@ -1213,6 +1213,8 @@
  39         }
  40         /* XXX locking */
  41         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  42 +               int count;
  43 +
  44                 IEEE80211_DPRINTF(vap,
  45                         IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
  46                         "%s\n", "beacon miss");
  47 @@ -1225,6 +1227,29 @@
  48                 if (vap->iv_opmode != IEEE80211_M_STA ||
  49                     vap->iv_state != IEEE80211_S_RUN)
  50                         continue;
  51 +
  52 +               IEEE80211_LOCK_IRQ(ic);
  53 +               count = vap->iv_bmiss_count++;
  54 +               if (count) {
  55 +                       /* if the counter was already above zero, reset it
  56 +                        * here, since we're going to do the bmiss handling
  57 +                        * in any case */
  58 +                       vap->iv_bmiss_count = 0;
  59 +               } else {
  60 +                       /* schedule the software beacon miss timer, it will be
  61 +                        * cancelled, if the probe request is acked */
  62 +                       mod_timer(&vap->iv_swbmiss, jiffies + vap->iv_swbmiss_period);
  63 +               }
  64 +               IEEE80211_UNLOCK_IRQ(ic);
  65 +
  66 +               if (!count) {
  67 +                       ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
  68 +                               vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
  69 +                               vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen,
  70 +                               NULL, 0);
  71 +                       continue;
  72 +               }
  73 +
  74                 if (ic->ic_roaming == IEEE80211_ROAMING_AUTO) {
  75  #ifdef ATH_SUPERG_DYNTURBO
  76                         /*
  77 @@ -1621,14 +1646,14 @@
  78                 }
  79
  80                 /* WDS/Repeater: Start software beacon timer for STA */
  81 +               vap->iv_swbmiss.function = ieee80211_sta_swbmiss;
  82 +               vap->iv_swbmiss.data = (unsigned long) vap;
  83 +               vap->iv_swbmiss_period = IEEE80211_TU_TO_JIFFIES(
  84 +                       vap->iv_ic->ic_bmissthreshold * ni->ni_intval);
  85 +
  86                 if (ostate != IEEE80211_S_RUN &&
  87                     (vap->iv_opmode == IEEE80211_M_STA &&
  88                      vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
  89 -                       vap->iv_swbmiss.function = ieee80211_sta_swbmiss;
  90 -                       vap->iv_swbmiss.data = (unsigned long) vap;
  91 -                       vap->iv_swbmiss_period = IEEE80211_TU_TO_JIFFIES(
  92 -                               vap->iv_ic->ic_bmissthreshold * ni->ni_intval);
  93 -
  94                         mod_timer(&vap->iv_swbmiss, jiffies + vap->iv_swbmiss_period);
  95                 }
  96
  97 Index: madwifi-trunk-r3776/net80211/ieee80211_var.h
  98 ===================================================================
  99 --- madwifi-trunk-r3776.orig/net80211/ieee80211_var.h   2008-07-17 04:03:07.000000000 +0200
 100 +++ madwifi-trunk-r3776/net80211/ieee80211_var.h        2008-07-17 04:06:33.000000000 +0200
 101 @@ -292,6 +292,7 @@
 102
 103         struct timer_list iv_swbmiss;                   /* software beacon miss timer */
 104         u_int16_t iv_swbmiss_period;                    /* software beacon miss timer period */
 105 +       u_int16_t iv_bmiss_count;                       /* consecutive beacon miss counter */
 106         struct ieee80211_nsparams iv_nsparams;          /* new state parameters for tasklet for stajoin1 */
 107         struct IEEE80211_TQ_STRUCT iv_stajoin1tq;       /* tasklet for newstate action called from stajoin1tq */
 108         unsigned int iv_nsdone;                         /* Done with scheduled newstate tasklet */