drivers/net/wireless/ath/ath9k/htc_drv_beacon.c

   1 /*
   2  * Copyright (c) 2010 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "htc.h"
  18
  19 #define FUDGE 2
  20
  21 static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
  22                                         struct htc_beacon_config *bss_conf)
  23 {
  24         struct ath_common *common = ath9k_hw_common(priv->ah);
  25         struct ath9k_beacon_state bs;
  26         enum ath9k_int imask = 0;
  27         int dtimperiod, dtimcount, sleepduration;
  28         int cfpperiod, cfpcount, bmiss_timeout;
  29         u32 nexttbtt = 0, intval, tsftu;
  30         __be32 htc_imask = 0;
  31         u64 tsf;
  32         int num_beacons, offset, dtim_dec_count, cfp_dec_count;
  33         int ret;
  34         u8 cmd_rsp;
  35
  36         memset(&bs, 0, sizeof(bs));
  37
  38         intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
  39         bmiss_timeout = (ATH_DEFAULT_BMISS_LIMIT * bss_conf->beacon_interval);
  40
  41         /*
  42          * Setup dtim and cfp parameters according to
  43          * last beacon we received (which may be none).
  44          */
  45         dtimperiod = bss_conf->dtim_period;
  46         if (dtimperiod <= 0)            /* NB: 0 if not known */
  47                 dtimperiod = 1;
  48         dtimcount = 1;
  49         if (dtimcount >= dtimperiod)    /* NB: sanity check */
  50                 dtimcount = 0;
  51         cfpperiod = 1;                  /* NB: no PCF support yet */
  52         cfpcount = 0;
  53
  54         sleepduration = intval;
  55         if (sleepduration <= 0)
  56                 sleepduration = intval;
  57
  58         /*
  59          * Pull nexttbtt forward to reflect the current
  60          * TSF and calculate dtim+cfp state for the result.
  61          */
  62         tsf = ath9k_hw_gettsf64(priv->ah);
  63         tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
  64
  65         num_beacons = tsftu / intval + 1;
  66         offset = tsftu % intval;
  67         nexttbtt = tsftu - offset;
  68         if (offset)
  69                 nexttbtt += intval;
  70
  71         /* DTIM Beacon every dtimperiod Beacon */
  72         dtim_dec_count = num_beacons % dtimperiod;
  73         /* CFP every cfpperiod DTIM Beacon */
  74         cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
  75         if (dtim_dec_count)
  76                 cfp_dec_count++;
  77
  78         dtimcount -= dtim_dec_count;
  79         if (dtimcount < 0)
  80                 dtimcount += dtimperiod;
  81
  82         cfpcount -= cfp_dec_count;
  83         if (cfpcount < 0)
  84                 cfpcount += cfpperiod;
  85
  86         bs.bs_intval = intval;
  87         bs.bs_nexttbtt = nexttbtt;
  88         bs.bs_dtimperiod = dtimperiod*intval;
  89         bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
  90         bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
  91         bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
  92         bs.bs_cfpmaxduration = 0;
  93
  94         /*
  95          * Calculate the number of consecutive beacons to miss* before taking
  96          * a BMISS interrupt. The configuration is specified in TU so we only
  97          * need calculate based on the beacon interval.  Note that we clamp the
  98          * result to at most 15 beacons.
  99          */
 100         if (sleepduration > intval) {
 101                 bs.bs_bmissthreshold = ATH_DEFAULT_BMISS_LIMIT / 2;
 102         } else {
 103                 bs.bs_bmissthreshold = DIV_ROUND_UP(bmiss_timeout, intval);
 104                 if (bs.bs_bmissthreshold > 15)
 105                         bs.bs_bmissthreshold = 15;
 106                 else if (bs.bs_bmissthreshold <= 0)
 107                         bs.bs_bmissthreshold = 1;
 108         }
 109
 110         /*
 111          * Calculate sleep duration. The configuration is given in ms.
 112          * We ensure a multiple of the beacon period is used. Also, if the sleep
 113          * duration is greater than the DTIM period then it makes senses
 114          * to make it a multiple of that.
 115          *
 116          * XXX fixed at 100ms
 117          */
 118
 119         bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
 120         if (bs.bs_sleepduration > bs.bs_dtimperiod)
 121                 bs.bs_sleepduration = bs.bs_dtimperiod;
 122
 123         /* TSF out of range threshold fixed at 1 second */
 124         bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
 125
 126         ath_dbg(common, ATH_DBG_CONFIG, "intval: %u tsf: %llu tsftu: %u\n",
 127                 intval, tsf, tsftu);
 128         ath_dbg(common, ATH_DBG_CONFIG,
 129                 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
 130                 bs.bs_bmissthreshold, bs.bs_sleepduration,
 131                 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
 132
 133         /* Set the computed STA beacon timers */
 134
 135         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 136         ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
 137         imask |= ATH9K_INT_BMISS;
 138         htc_imask = cpu_to_be32(imask);
 139         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 140 }
 141
 142 static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
 143                                        struct htc_beacon_config *bss_conf)
 144 {
 145         struct ath_common *common = ath9k_hw_common(priv->ah);
 146         enum ath9k_int imask = 0;
 147         u32 nexttbtt, intval, tsftu;
 148         __be32 htc_imask = 0;
 149         int ret;
 150         u8 cmd_rsp;
 151         u64 tsf;
 152
 153         intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
 154         intval /= ATH9K_HTC_MAX_BCN_VIF;
 155         nexttbtt = intval;
 156
 157         if (priv->op_flags & OP_TSF_RESET) {
 158                 intval |= ATH9K_BEACON_RESET_TSF;
 159                 priv->op_flags &= ~OP_TSF_RESET;
 160         } else {
 161                 /*
 162                  * Pull nexttbtt forward to reflect the current TSF.
 163                  */
 164                 tsf = ath9k_hw_gettsf64(priv->ah);
 165                 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
 166                 do {
 167                         nexttbtt += intval;
 168                 } while (nexttbtt < tsftu);
 169         }
 170
 171         intval |= ATH9K_BEACON_ENA;
 172
 173         if (priv->op_flags & OP_ENABLE_BEACON)
 174                 imask |= ATH9K_INT_SWBA;
 175
 176         ath_dbg(common, ATH_DBG_CONFIG,
 177                 "AP Beacon config, intval: %d, nexttbtt: %u imask: 0x%x\n",
 178                 bss_conf->beacon_interval, nexttbtt, imask);
 179
 180         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 181         ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
 182         priv->bmiss_cnt = 0;
 183         htc_imask = cpu_to_be32(imask);
 184         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 185 }
 186
 187 static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
 188                                           struct htc_beacon_config *bss_conf)
 189 {
 190         struct ath_common *common = ath9k_hw_common(priv->ah);
 191         enum ath9k_int imask = 0;
 192         u32 nexttbtt, intval, tsftu;
 193         __be32 htc_imask = 0;
 194         int ret;
 195         u8 cmd_rsp;
 196         u64 tsf;
 197
 198         intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
 199         nexttbtt = intval;
 200
 201         /*
 202          * Pull nexttbtt forward to reflect the current TSF.
 203          */
 204         tsf = ath9k_hw_gettsf64(priv->ah);
 205         tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
 206         do {
 207                 nexttbtt += intval;
 208         } while (nexttbtt < tsftu);
 209
 210         intval |= ATH9K_BEACON_ENA;
 211         if (priv->op_flags & OP_ENABLE_BEACON)
 212                 imask |= ATH9K_INT_SWBA;
 213
 214         ath_dbg(common, ATH_DBG_CONFIG,
 215                 "IBSS Beacon config, intval: %d, nexttbtt: %u, imask: 0x%x\n",
 216                 bss_conf->beacon_interval, nexttbtt, imask);
 217
 218         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 219         ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
 220         priv->bmiss_cnt = 0;
 221         htc_imask = cpu_to_be32(imask);
 222         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 223 }
 224
 225 void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,
 226                         enum htc_endpoint_id ep_id, bool txok)
 227 {
 228         dev_kfree_skb_any(skb);
 229 }
 230
 231 void ath9k_htc_swba(struct ath9k_htc_priv *priv, u8 beacon_pending)
 232 {
 233         struct ath9k_htc_vif *avp = (void *)priv->vif->drv_priv;
 234         struct tx_beacon_header beacon_hdr;
 235         struct ath9k_htc_tx_ctl tx_ctl;
 236         struct ieee80211_tx_info *info;
 237         struct sk_buff *beacon;
 238         u8 *tx_fhdr;
 239
 240         memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
 241         memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
 242
 243         /* FIXME: Handle BMISS */
 244         if (beacon_pending != 0) {
 245                 priv->bmiss_cnt++;
 246                 return;
 247         }
 248
 249         spin_lock_bh(&priv->beacon_lock);
 250
 251         if (unlikely(priv->op_flags & OP_SCANNING)) {
 252                 spin_unlock_bh(&priv->beacon_lock);
 253                 return;
 254         }
 255
 256         /* Get a new beacon */
 257         beacon = ieee80211_beacon_get(priv->hw, priv->vif);
 258         if (!beacon) {
 259                 spin_unlock_bh(&priv->beacon_lock);
 260                 return;
 261         }
 262
 263         info = IEEE80211_SKB_CB(beacon);
 264         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 265                 struct ieee80211_hdr *hdr =
 266                         (struct ieee80211_hdr *) beacon->data;
 267                 avp->seq_no += 0x10;
 268                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 269                 hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
 270         }
 271
 272         tx_ctl.type = ATH9K_HTC_NORMAL;
 273         beacon_hdr.vif_index = avp->index;
 274         tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
 275         memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
 276
 277         htc_send(priv->htc, beacon, priv->beacon_ep, &tx_ctl);
 278
 279         spin_unlock_bh(&priv->beacon_lock);
 280 }
 281
 282 /* Currently, only for IBSS */
 283 void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
 284 {
 285         struct ath_hw *ah = priv->ah;
 286         struct ath9k_tx_queue_info qi, qi_be;
 287         int qnum = priv->hwq_map[WME_AC_BE];
 288
 289         memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
 290         memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));
 291
 292         ath9k_hw_get_txq_props(ah, qnum, &qi_be);
 293
 294         qi.tqi_aifs = qi_be.tqi_aifs;
 295         /* For WIFI Beacon Distribution
 296          * Long slot time  : 2x cwmin
 297          * Short slot time : 4x cwmin
 298          */
 299         if (ah->slottime == ATH9K_SLOT_TIME_20)
 300                 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
 301         else
 302                 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
 303         qi.tqi_cwmax = qi_be.tqi_cwmax;
 304
 305         if (!ath9k_hw_set_txq_props(ah, priv->beaconq, &qi)) {
 306                 ath_err(ath9k_hw_common(ah),
 307                         "Unable to update beacon queue %u!\n", qnum);
 308         } else {
 309                 ath9k_hw_resettxqueue(ah, priv->beaconq);
 310         }
 311 }
 312
 313 static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 314 {
 315         bool *beacon_configured = (bool *)data;
 316         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
 317
 318         if (vif->type == NL80211_IFTYPE_STATION &&
 319             avp->beacon_configured)
 320                 *beacon_configured = true;
 321 }
 322
 323 static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
 324                                           struct ieee80211_vif *vif)
 325 {
 326         struct ath_common *common = ath9k_hw_common(priv->ah);
 327         struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
 328         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 329         bool beacon_configured;
 330
 331         /*
 332          * Changing the beacon interval when multiple AP interfaces
 333          * are configured will affect beacon transmission of all
 334          * of them.
 335          */
 336         if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
 337             (priv->num_ap_vif > 1) &&
 338             (vif->type == NL80211_IFTYPE_AP) &&
 339             (cur_conf->beacon_interval != bss_conf->beacon_int)) {
 340                 ath_dbg(common, ATH_DBG_CONFIG,
 341                         "Changing beacon interval of multiple AP interfaces !\n");
 342                 return false;
 343         }
 344
 345         /*
 346          * If the HW is operating in AP mode, any new station interfaces that
 347          * are added cannot change the beacon parameters.
 348          */
 349         if (priv->num_ap_vif &&
 350             (vif->type != NL80211_IFTYPE_AP)) {
 351                 ath_dbg(common, ATH_DBG_CONFIG,
 352                         "HW in AP mode, cannot set STA beacon parameters\n");
 353                 return false;
 354         }
 355
 356         /*
 357          * The beacon parameters are configured only for the first
 358          * station interface.
 359          */
 360         if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
 361             (priv->num_sta_vif > 1) &&
 362             (vif->type == NL80211_IFTYPE_STATION)) {
 363                 beacon_configured = false;
 364                 ieee80211_iterate_active_interfaces_atomic(priv->hw,
 365                                                            ath9k_htc_beacon_iter,
 366                                                            &beacon_configured);
 367
 368                 if (beacon_configured) {
 369                         ath_dbg(common, ATH_DBG_CONFIG,
 370                                 "Beacon already configured for a station interface\n");
 371                         return false;
 372                 }
 373         }
 374
 375         return true;
 376 }
 377
 378 void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
 379                              struct ieee80211_vif *vif)
 380 {
 381         struct ath_common *common = ath9k_hw_common(priv->ah);
 382         struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
 383         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 384         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
 385
 386         if (!ath9k_htc_check_beacon_config(priv, vif))
 387                 return;
 388
 389         cur_conf->beacon_interval = bss_conf->beacon_int;
 390         if (cur_conf->beacon_interval == 0)
 391                 cur_conf->beacon_interval = 100;
 392
 393         cur_conf->dtim_period = bss_conf->dtim_period;
 394         cur_conf->bmiss_timeout =
 395                 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
 396
 397         switch (vif->type) {
 398         case NL80211_IFTYPE_STATION:
 399                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 400                 avp->beacon_configured = true;
 401                 break;
 402         case NL80211_IFTYPE_ADHOC:
 403                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 404                 break;
 405         case NL80211_IFTYPE_AP:
 406                 ath9k_htc_beacon_config_ap(priv, cur_conf);
 407                 break;
 408         default:
 409                 ath_dbg(common, ATH_DBG_CONFIG,
 410                         "Unsupported beaconing mode\n");
 411                 return;
 412         }
 413 }
 414
 415 void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
 416 {
 417         struct ath_common *common = ath9k_hw_common(priv->ah);
 418         struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
 419
 420         switch (priv->ah->opmode) {
 421         case NL80211_IFTYPE_STATION:
 422                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 423                 break;
 424         case NL80211_IFTYPE_ADHOC:
 425                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 426                 break;
 427         case NL80211_IFTYPE_AP:
 428                 ath9k_htc_beacon_config_ap(priv, cur_conf);
 429                 break;
 430         default:
 431                 ath_dbg(common, ATH_DBG_CONFIG,
 432                         "Unsupported beaconing mode\n");
 433                 return;
 434         }
 435 }