package/madwifi/patches/389-autochannel.patch

   1 --- a/ath/if_ath.c
   2 +++ b/ath/if_ath.c
   3 @@ -384,6 +384,7 @@ static u_int32_t ath_get_real_maxtxpower
   4
   5  static void ath_poll_disable(struct net_device *dev);
   6  static void ath_poll_enable(struct net_device *dev);
   7 +static void ath_fetch_idle_time(struct ath_softc *sc);
   8
   9  /* calibrate every 30 secs in steady state but check every second at first. */
  10  static int ath_calinterval = ATH_SHORT_CALINTERVAL;
  11 @@ -2581,6 +2582,7 @@ ath_init(struct net_device *dev)
  12          * be followed by initialization of the appropriate bits
  13          * and then setup of the interrupt mask.
  14          */
  15 +       ath_fetch_idle_time(sc);
  16         sc->sc_curchan.channel = ic->ic_curchan->ic_freq;
  17         sc->sc_curchan.channelFlags = ath_chan2flags(ic->ic_curchan);
  18         if (!ath_hal_reset(ah, sc->sc_opmode, &sc->sc_curchan, AH_FALSE, &status)) {
  19 @@ -2914,6 +2916,48 @@ ath_hw_check_atim(struct ath_softc *sc,
  20         return 0;
  21  }
  22
  23 +#define AR5K_MIBC       0x0040
  24 +#define AR5K_MIBC_FREEZE   (1 << 1)
  25 +#define AR5K_TXFC       0x80ec
  26 +#define AR5K_RXFC       0x80f0
  27 +#define AR5K_RXCLEAR   0x80f4
  28 +#define AR5K_CYCLES            0x80f8
  29 +static void
  30 +ath_fetch_idle_time(struct ath_softc *sc)
  31 +{
  32 +       struct ieee80211com *ic = &sc->sc_ic;
  33 +       struct ath_hal *ah = sc->sc_ah;
  34 +       u_int32_t cc, rx;
  35 +       u_int32_t time = 0;
  36 +
  37 +       if (sc->sc_ah->ah_macType < 5212)
  38 +               return;
  39 +
  40 +       if (!ic->ic_curchan || (ic->ic_curchan == IEEE80211_CHAN_ANYC))
  41 +               return;
  42 +
  43 +       OS_REG_WRITE(ah, AR5K_MIBC, AR5K_MIBC_FREEZE);
  44 +       rx = OS_REG_READ(ah, AR5K_RXCLEAR);
  45 +       cc = OS_REG_READ(ah, AR5K_CYCLES);
  46 +
  47 +       if (!cc)
  48 +               return;
  49 +
  50 +       if (rx > cc)
  51 +               return; /* should not happen */
  52 +
  53 +       if (sc->sc_last_chan)
  54 +               sc->sc_last_chan->ic_idletime = 100 * (cc - rx) / cc;
  55 +       sc->sc_last_chan = ic->ic_curchan;
  56 +
  57 +       OS_REG_WRITE(ah, AR5K_RXCLEAR, 0);
  58 +       OS_REG_WRITE(ah, AR5K_CYCLES, 0);
  59 +       OS_REG_WRITE(ah, AR5K_TXFC, 0);
  60 +       OS_REG_WRITE(ah, AR5K_RXFC, 0);
  61 +       OS_REG_WRITE(ah, AR5K_MIBC, 0);
  62 +}
  63 +#undef AR5K_RXCLEAR
  64 +#undef AR5K_CYCLES
  65
  66  /*
  67   * Reset the hardware w/o losing operational state.  This is
  68 @@ -2941,6 +2985,7 @@ ath_reset(struct net_device *dev)
  69          * Convert to a HAL channel description with the flags
  70          * constrained to reflect the current operating mode.
  71          */
  72 +       ath_fetch_idle_time(sc);
  73         c = ic->ic_curchan;
  74         sc->sc_curchan.channel = c->ic_freq;
  75         sc->sc_curchan.channelFlags = ath_chan2flags(c);
  76 @@ -9023,6 +9068,7 @@ ath_chan_set(struct ath_softc *sc, struc
  77         u_int8_t channel_change_required = 0;
  78         struct timeval tv;
  79
  80 +
  81         /*
  82          * Convert to a HAL channel description with
  83          * the flags constrained to reflect the current
  84 @@ -9031,6 +9077,14 @@ ath_chan_set(struct ath_softc *sc, struc
  85         memset(&hchan, 0, sizeof(HAL_CHANNEL));
  86         hchan.channel = chan->ic_freq;
  87         hchan.channelFlags = ath_chan2flags(chan);
  88 +
  89 +       /* don't do duplicate channel changes, but do
  90 +        * store the available idle time */
  91 +       ath_fetch_idle_time(sc);
  92 +       if ((sc->sc_curchan.channel == hchan.channel) &&
  93 +               (sc->sc_curchan.channelFlags == hchan.channelFlags))
  94 +               return 0;
  95 +
  96         KASSERT(hchan.channel != 0,
  97                 ("bogus channel %u/0x%x", hchan.channel, hchan.channelFlags));
  98         do_gettimeofday(&tv);
  99 --- a/ath/if_athvar.h
 100 +++ b/ath/if_athvar.h
 101 @@ -774,6 +774,7 @@ struct ath_softc {
 102         struct ieee80211vap **sc_bslot;         /* beacon xmit slots */
 103         int sc_bnext;                           /* next slot for beacon xmit */
 104
 105 +       struct ieee80211_channel *sc_last_chan;
 106         int sc_beacon_cal;                      /* use beacon timer for calibration */
 107         u_int64_t sc_lastcal;                   /* last time the calibration was performed */
 108         struct timer_list sc_cal_ch;            /* calibration timer */
 109 --- a/net80211/_ieee80211.h
 110 +++ b/net80211/_ieee80211.h
 111 @@ -148,6 +148,7 @@ struct ieee80211_channel {
 112         int8_t ic_maxpower;     /* maximum tx power in dBm */
 113         int8_t ic_minpower;     /* minimum tx power in dBm */
 114         u_int8_t ic_scanflags;
 115 +       u_int8_t ic_idletime; /* phy idle time in % */
 116  };
 117
 118  #define        IEEE80211_CHAN_MAX      255
 119 --- a/net80211/ieee80211_scan_ap.c
 120 +++ b/net80211/ieee80211_scan_ap.c
 121 @@ -417,6 +417,19 @@ pc_cmp_rssi(struct ap_state *as, struct
 122
 123  /* This function must be invoked with locks acquired */
 124  static int
 125 +pc_cmp_idletime(struct ieee80211_channel *a,
 126 +               struct ieee80211_channel *b)
 127 +{
 128 +       if (!a->ic_idletime || !b->ic_idletime)
 129 +               return 0;
 130 +
 131 +       /* a is better than b (return < 0) when a has more idle time than b */
 132 +       return b->ic_idletime - a->ic_idletime;
 133 +}
 134 +
 135 +
 136 +/* This function must be invoked with locks acquired */
 137 +static int
 138  pc_cmp_samechan(struct ieee80211com *ic, struct ieee80211_channel *a,
 139                 struct ieee80211_channel *b)
 140  {
 141 @@ -451,6 +464,7 @@ pc_cmp(const void *_a, const void *_b)
 142
 143         EVALUATE_CRITERION(radar, a, b);
 144         EVALUATE_CRITERION(keepmode, params, a, b);
 145 +       EVALUATE_CRITERION(idletime, a, b);
 146         EVALUATE_CRITERION(sc, ic, a, b);
 147         /* XXX: rssi useless? pick_channel evaluates it anyway */
 148         EVALUATE_CRITERION(rssi, params->ss->ss_priv, a, b);
 149 @@ -519,16 +533,9 @@ pick_channel(struct ieee80211_scan_state
 150  #endif
 151
 152         best = NULL;
 153 -       best_rssi = 0xff; /* If signal is bigger than 0xff, we'd be melting. */
 154
 155         for (i = 0; i < ss_last; i++) {
 156                 c = &chans[i];
 157 -               benefit = best_rssi - as->as_maxrssi[c->chan->ic_ieee];
 158 -               sta_assoc = ic->ic_sta_assoc;
 159 -
 160 -               /* Don't switch... */
 161 -               if (benefit <= 0)
 162 -                       continue;
 163
 164                 /* Verify channel is not marked for non-occupancy */
 165                 if (IEEE80211_IS_CHAN_RADAR(c->chan))
 166 @@ -546,31 +553,8 @@ pick_channel(struct ieee80211_scan_state
 167                                 break;
 168                 }
 169
 170 -               if (sta_assoc != 0) {
 171 -                       int sl = ic->ic_cn_total -
 172 -                               ic->ic_chan_nodes[c->chan->ic_ieee]; /* count */
 173 -                       if (ic->ic_sc_algorithm == IEEE80211_SC_LOOSE) {
 174 -                               int sl_max = ic->ic_sc_sldg * benefit;
 175 -                               sl = 1000 * sl / sta_assoc; /* permil */
 176 -                               IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
 177 -                                               "%s: chan %d, dB gained: %d, "
 178 -                                               "STAs lost: %d permil (max %d)\n",
 179 -                                               __func__, c->chan->ic_ieee,
 180 -                                               benefit, sl, sl_max);
 181 -                               if (sl > sl_max)
 182 -                                       continue;
 183 -                       } else if (((ic->ic_sc_algorithm ==
 184 -                                                IEEE80211_SC_TIGHT) ||
 185 -                                       (ic->ic_sc_algorithm ==
 186 -                                                IEEE80211_SC_STRICT)) &&
 187 -                                       (sl > 0)) {
 188 -                               /* Break the loop as the subsequent chans
 189 -                                * won't be better. */
 190 -                               break;
 191 -                       }
 192 -               }
 193                 best = c->chan;
 194 -               best_rssi = as->as_maxrssi[best->ic_ieee];
 195 +               break;
 196         }
 197
 198         if (best != NULL) {
 199 @@ -599,6 +583,9 @@ ap_end(struct ieee80211_scan_state *ss,
 200                 ("wrong opmode %u", vap->iv_opmode));
 201
 202         ic = vap->iv_ic;
 203 +
 204 +       /* record stats for the channel that was scanned last */
 205 +       ic->ic_set_channel(ic);
 206         bestchan = pick_channel(ss, vap, flags);
 207         if (bestchan == NULL) {
 208                 if (ss->ss_last > 0) {
 209 --- a/net80211/ieee80211_scan.c
 210 +++ b/net80211/ieee80211_scan.c
 211 @@ -1002,20 +1002,34 @@ ieee80211_scan_add_channels(struct ieee8
 212  {
 213         struct ieee80211_channel *c, *cg;
 214         u_int modeflags;
 215 +       int has_non_turbo = 0;
 216         int i;
 217
 218         KASSERT(mode < ARRAY_SIZE(chanflags), ("Unexpected mode %u", mode));
 219         modeflags = chanflags[mode];
 220         for (i = 0; i < ic->ic_nchans; i++) {
 221                 c = &ic->ic_channels[i];
 222 +               if (c->ic_flags & (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO))
 223 +                       continue;
 224 +
 225 +               has_non_turbo = 1;
 226 +               break;
 227 +       }
 228 +       for (i = 0; i < ic->ic_nchans; i++) {
 229 +               c = &ic->ic_channels[i];
 230                 if (c == NULL || isclr(ic->ic_chan_active, c->ic_ieee))
 231                         continue;
 232                 if (c->ic_scanflags & IEEE80211_NOSCAN_SET)
 233                         continue;
 234 -               if (modeflags &&
 235 -                       ((c->ic_flags & IEEE80211_CHAN_ALLTURBO) !=
 236 -                        (modeflags & IEEE80211_CHAN_ALLTURBO)))
 237 -                       continue;
 238 +               if (modeflags) {
 239 +                       if ((c->ic_flags & IEEE80211_CHAN_ALLTURBO) !=
 240 +                                (modeflags & IEEE80211_CHAN_ALLTURBO))
 241 +                               continue;
 242 +               } else if (has_non_turbo) {
 243 +                       if ((ss->ss_vap->iv_opmode == IEEE80211_M_HOSTAP) &&
 244 +                               (c->ic_flags & (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO)))
 245 +                               continue;
 246 +               }
 247                 if (mode == IEEE80211_MODE_AUTO) {
 248                         /*
 249                          * XXX special-case 11b/g channels so we select