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

   1 /*
   2  * Copyright (c) 2010-2011 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 void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
  22 {
  23         struct ath_hw *ah = priv->ah;
  24         struct ath9k_tx_queue_info qi, qi_be;
  25
  26         memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
  27         memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));
  28
  29         ath9k_hw_get_txq_props(ah, priv->beacon.beaconq, &qi);
  30
  31         if (priv->ah->opmode == NL80211_IFTYPE_AP ||
  32             priv->ah->opmode == NL80211_IFTYPE_MESH_POINT) {
  33                 qi.tqi_aifs = 1;
  34                 qi.tqi_cwmin = 0;
  35                 qi.tqi_cwmax = 0;
  36         } else if (priv->ah->opmode == NL80211_IFTYPE_ADHOC) {
  37                 int qnum = priv->hwq_map[IEEE80211_AC_BE];
  38
  39                 ath9k_hw_get_txq_props(ah, qnum, &qi_be);
  40
  41                 qi.tqi_aifs = qi_be.tqi_aifs;
  42
  43                 /*
  44                  * For WIFI Beacon Distribution
  45                  * Long slot time  : 2x cwmin
  46                  * Short slot time : 4x cwmin
  47                  */
  48                 if (ah->slottime == ATH9K_SLOT_TIME_20)
  49                         qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
  50                 else
  51                         qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
  52
  53                 qi.tqi_cwmax = qi_be.tqi_cwmax;
  54
  55         }
  56
  57         if (!ath9k_hw_set_txq_props(ah, priv->beacon.beaconq, &qi)) {
  58                 ath_err(ath9k_hw_common(ah),
  59                         "Unable to update beacon queue %u!\n", priv->beacon.beaconq);
  60         } else {
  61                 ath9k_hw_resettxqueue(ah, priv->beacon.beaconq);
  62         }
  63 }
  64
  65 /*
  66  * Both nexttbtt and intval have to be in usecs.
  67  */
  68 static void ath9k_htc_beacon_init(struct ath9k_htc_priv *priv,
  69                                   struct ath_beacon_config *conf,
  70                                   bool reset_tsf)
  71 {
  72         struct ath_hw *ah = priv->ah;
  73         int ret __attribute__ ((unused));
  74         __be32 htc_imask = 0;
  75         u8 cmd_rsp;
  76
  77         if (conf->intval >= TU_TO_USEC(DEFAULT_SWBA_RESPONSE))
  78                 ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
  79         else
  80                 ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
  81
  82         WMI_CMD(WMI_DISABLE_INTR_CMDID);
  83         if (reset_tsf)
  84                 ath9k_hw_reset_tsf(ah);
  85         ath9k_htc_beaconq_config(priv);
  86         ath9k_hw_beaconinit(ah, conf->nexttbtt, conf->intval);
  87         priv->beacon.bmisscnt = 0;
  88         htc_imask = cpu_to_be32(ah->imask);
  89         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
  90 }
  91
  92 static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
  93                                         struct ath_beacon_config *bss_conf)
  94 {
  95         struct ath9k_beacon_state bs;
  96         enum ath9k_int imask = 0;
  97         __be32 htc_imask = 0;
  98         int ret __attribute__ ((unused));
  99         u8 cmd_rsp;
 100
 101         if (ath9k_cmn_beacon_config_sta(priv->ah, bss_conf, &bs) == -EPERM)
 102                 return;
 103
 104         WMI_CMD(WMI_DISABLE_INTR_CMDID);
 105         ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
 106         imask |= ATH9K_INT_BMISS;
 107         htc_imask = cpu_to_be32(imask);
 108         WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
 109 }
 110
 111 static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
 112                                        struct ath_beacon_config *conf)
 113 {
 114         struct ath_hw *ah = priv->ah;
 115         ah->imask = 0;
 116
 117         ath9k_cmn_beacon_config_ap(ah, conf, ATH9K_HTC_MAX_BCN_VIF);
 118         ath9k_htc_beacon_init(priv, conf, false);
 119 }
 120
 121 static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
 122                                           struct ath_beacon_config *conf)
 123 {
 124         struct ath_hw *ah = priv->ah;
 125         ah->imask = 0;
 126
 127         ath9k_cmn_beacon_config_adhoc(ah, conf);
 128         ath9k_htc_beacon_init(priv, conf, conf->ibss_creator);
 129 }
 130
 131 void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,
 132                         enum htc_endpoint_id ep_id, bool txok)
 133 {
 134         dev_kfree_skb_any(skb);
 135 }
 136
 137 static void ath9k_htc_send_buffered(struct ath9k_htc_priv *priv,
 138                                     int slot)
 139 {
 140         struct ath_common *common = ath9k_hw_common(priv->ah);
 141         struct ieee80211_vif *vif;
 142         struct sk_buff *skb;
 143         struct ieee80211_hdr *hdr;
 144         int padpos, padsize, ret, tx_slot;
 145
 146         spin_lock_bh(&priv->beacon_lock);
 147
 148         vif = priv->beacon.bslot[slot];
 149
 150         skb = ieee80211_get_buffered_bc(priv->hw, vif);
 151
 152         while(skb) {
 153                 hdr = (struct ieee80211_hdr *) skb->data;
 154
 155                 padpos = ieee80211_hdrlen(hdr->frame_control);
 156                 padsize = padpos & 3;
 157                 if (padsize && skb->len > padpos) {
 158                         if (skb_headroom(skb) < padsize) {
 159                                 dev_kfree_skb_any(skb);
 160                                 goto next;
 161                         }
 162                         skb_push(skb, padsize);
 163                         memmove(skb->data, skb->data + padsize, padpos);
 164                 }
 165
 166                 tx_slot = ath9k_htc_tx_get_slot(priv);
 167                 if (tx_slot < 0) {
 168                         ath_dbg(common, XMIT, "No free CAB slot\n");
 169                         dev_kfree_skb_any(skb);
 170                         goto next;
 171                 }
 172
 173                 ret = ath9k_htc_tx_start(priv, NULL, skb, tx_slot, true);
 174                 if (ret != 0) {
 175                         ath9k_htc_tx_clear_slot(priv, tx_slot);
 176                         dev_kfree_skb_any(skb);
 177
 178                         ath_dbg(common, XMIT, "Failed to send CAB frame\n");
 179                 } else {
 180                         spin_lock_bh(&priv->tx.tx_lock);
 181                         priv->tx.queued_cnt++;
 182                         spin_unlock_bh(&priv->tx.tx_lock);
 183                 }
 184         next:
 185                 skb = ieee80211_get_buffered_bc(priv->hw, vif);
 186         }
 187
 188         spin_unlock_bh(&priv->beacon_lock);
 189 }
 190
 191 static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,
 192                                   int slot)
 193 {
 194         struct ath_common *common = ath9k_hw_common(priv->ah);
 195         struct ieee80211_vif *vif;
 196         struct ath9k_htc_vif *avp;
 197         struct tx_beacon_header beacon_hdr;
 198         struct ath9k_htc_tx_ctl *tx_ctl;
 199         struct ieee80211_tx_info *info;
 200         struct ieee80211_mgmt *mgmt;
 201         struct sk_buff *beacon;
 202         u8 *tx_fhdr;
 203         int ret;
 204
 205         memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
 206
 207         spin_lock_bh(&priv->beacon_lock);
 208
 209         vif = priv->beacon.bslot[slot];
 210         avp = (struct ath9k_htc_vif *)vif->drv_priv;
 211
 212         if (unlikely(test_bit(ATH_OP_SCANNING, &common->op_flags))) {
 213                 spin_unlock_bh(&priv->beacon_lock);
 214                 return;
 215         }
 216
 217         /* Get a new beacon */
 218         beacon = ieee80211_beacon_get(priv->hw, vif);
 219         if (!beacon) {
 220                 spin_unlock_bh(&priv->beacon_lock);
 221                 return;
 222         }
 223
 224         /*
 225          * Update the TSF adjust value here, the HW will
 226          * add this value for every beacon.
 227          */
 228         mgmt = (struct ieee80211_mgmt *)beacon->data;
 229         mgmt->u.beacon.timestamp = avp->tsfadjust;
 230
 231         info = IEEE80211_SKB_CB(beacon);
 232         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 233                 struct ieee80211_hdr *hdr =
 234                         (struct ieee80211_hdr *) beacon->data;
 235                 avp->seq_no += 0x10;
 236                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 237                 hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
 238         }
 239
 240         tx_ctl = HTC_SKB_CB(beacon);
 241         memset(tx_ctl, 0, sizeof(*tx_ctl));
 242
 243         tx_ctl->type = ATH9K_HTC_BEACON;
 244         tx_ctl->epid = priv->beacon_ep;
 245
 246         beacon_hdr.vif_index = avp->index;
 247         tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
 248         memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
 249
 250         ret = htc_send(priv->htc, beacon);
 251         if (ret != 0) {
 252                 if (ret == -ENOMEM) {
 253                         ath_dbg(common, BSTUCK,
 254                                 "Failed to send beacon, no free TX buffer\n");
 255                 }
 256                 dev_kfree_skb_any(beacon);
 257         }
 258
 259         spin_unlock_bh(&priv->beacon_lock);
 260 }
 261
 262 static int ath9k_htc_choose_bslot(struct ath9k_htc_priv *priv,
 263                                   struct wmi_event_swba *swba)
 264 {
 265         struct ath_common *common = ath9k_hw_common(priv->ah);
 266         u64 tsf;
 267         u32 tsftu;
 268         u16 intval;
 269         int slot;
 270
 271         intval = priv->cur_beacon_conf.beacon_interval;
 272
 273         tsf = be64_to_cpu(swba->tsf);
 274         tsftu = TSF_TO_TU(tsf >> 32, tsf);
 275         slot = ((tsftu % intval) * ATH9K_HTC_MAX_BCN_VIF) / intval;
 276         slot = ATH9K_HTC_MAX_BCN_VIF - slot - 1;
 277
 278         ath_dbg(common, BEACON,
 279                 "Choose slot: %d, tsf: %llu, tsftu: %u, intval: %u\n",
 280                 slot, tsf, tsftu, intval);
 281
 282         return slot;
 283 }
 284
 285 void ath9k_htc_swba(struct ath9k_htc_priv *priv,
 286                     struct wmi_event_swba *swba)
 287 {
 288         struct ath_common *common = ath9k_hw_common(priv->ah);
 289         int slot;
 290
 291         if (swba->beacon_pending != 0) {
 292                 priv->beacon.bmisscnt++;
 293                 if (priv->beacon.bmisscnt > BSTUCK_THRESHOLD) {
 294                         ath_dbg(common, BSTUCK, "Beacon stuck, HW reset\n");
 295                         ieee80211_queue_work(priv->hw,
 296                                              &priv->fatal_work);
 297                 }
 298                 return;
 299         }
 300
 301         if (priv->beacon.bmisscnt) {
 302                 ath_dbg(common, BSTUCK,
 303                         "Resuming beacon xmit after %u misses\n",
 304                         priv->beacon.bmisscnt);
 305                 priv->beacon.bmisscnt = 0;
 306         }
 307
 308         slot = ath9k_htc_choose_bslot(priv, swba);
 309         spin_lock_bh(&priv->beacon_lock);
 310         if (priv->beacon.bslot[slot] == NULL) {
 311                 spin_unlock_bh(&priv->beacon_lock);
 312                 return;
 313         }
 314         spin_unlock_bh(&priv->beacon_lock);
 315
 316         ath9k_htc_send_buffered(priv, slot);
 317         ath9k_htc_send_beacon(priv, slot);
 318 }
 319
 320 void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,
 321                             struct ieee80211_vif *vif)
 322 {
 323         struct ath_common *common = ath9k_hw_common(priv->ah);
 324         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
 325         int i = 0;
 326
 327         spin_lock_bh(&priv->beacon_lock);
 328         for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {
 329                 if (priv->beacon.bslot[i] == NULL) {
 330                         avp->bslot = i;
 331                         break;
 332                 }
 333         }
 334
 335         priv->beacon.bslot[avp->bslot] = vif;
 336         spin_unlock_bh(&priv->beacon_lock);
 337
 338         ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
 339                 avp->bslot);
 340 }
 341
 342 void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,
 343                             struct ieee80211_vif *vif)
 344 {
 345         struct ath_common *common = ath9k_hw_common(priv->ah);
 346         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
 347
 348         spin_lock_bh(&priv->beacon_lock);
 349         priv->beacon.bslot[avp->bslot] = NULL;
 350         spin_unlock_bh(&priv->beacon_lock);
 351
 352         ath_dbg(common, CONFIG, "Removed interface at beacon slot: %d\n",
 353                 avp->bslot);
 354 }
 355
 356 /*
 357  * Calculate the TSF adjustment value for all slots
 358  * other than zero.
 359  */
 360 void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,
 361                              struct ieee80211_vif *vif)
 362 {
 363         struct ath_common *common = ath9k_hw_common(priv->ah);
 364         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
 365         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 366         u64 tsfadjust;
 367
 368         if (avp->bslot == 0)
 369                 return;
 370
 371         /*
 372          * The beacon interval cannot be different for multi-AP mode,
 373          * and we reach here only for VIF slots greater than zero,
 374          * so beacon_interval is guaranteed to be set in cur_conf.
 375          */
 376         tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;
 377         avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
 378
 379         ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
 380                 (unsigned long long)tsfadjust, avp->bslot);
 381 }
 382
 383 static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 384 {
 385         bool *beacon_configured = (bool *)data;
 386         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
 387
 388         if (vif->type == NL80211_IFTYPE_STATION &&
 389             avp->beacon_configured)
 390                 *beacon_configured = true;
 391 }
 392
 393 static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
 394                                           struct ieee80211_vif *vif)
 395 {
 396         struct ath_common *common = ath9k_hw_common(priv->ah);
 397         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 398         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 399         bool beacon_configured;
 400
 401         /*
 402          * Changing the beacon interval when multiple AP interfaces
 403          * are configured will affect beacon transmission of all
 404          * of them.
 405          */
 406         if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
 407             (priv->num_ap_vif > 1) &&
 408             (vif->type == NL80211_IFTYPE_AP) &&
 409             (cur_conf->beacon_interval != bss_conf->beacon_int)) {
 410                 ath_dbg(common, CONFIG,
 411                         "Changing beacon interval of multiple AP interfaces !\n");
 412                 return false;
 413         }
 414
 415         /*
 416          * If the HW is operating in AP mode, any new station interfaces that
 417          * are added cannot change the beacon parameters.
 418          */
 419         if (priv->num_ap_vif &&
 420             (vif->type != NL80211_IFTYPE_AP)) {
 421                 ath_dbg(common, CONFIG,
 422                         "HW in AP mode, cannot set STA beacon parameters\n");
 423                 return false;
 424         }
 425
 426         /*
 427          * The beacon parameters are configured only for the first
 428          * station interface.
 429          */
 430         if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
 431             (priv->num_sta_vif > 1) &&
 432             (vif->type == NL80211_IFTYPE_STATION)) {
 433                 beacon_configured = false;
 434                 ieee80211_iterate_active_interfaces_atomic(
 435                         priv->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 436                         ath9k_htc_beacon_iter, &beacon_configured);
 437
 438                 if (beacon_configured) {
 439                         ath_dbg(common, CONFIG,
 440                                 "Beacon already configured for a station interface\n");
 441                         return false;
 442                 }
 443         }
 444
 445         return true;
 446 }
 447
 448 void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
 449                              struct ieee80211_vif *vif)
 450 {
 451         struct ath_common *common = ath9k_hw_common(priv->ah);
 452         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 453         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 454         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
 455
 456         if (!ath9k_htc_check_beacon_config(priv, vif))
 457                 return;
 458
 459         cur_conf->beacon_interval = bss_conf->beacon_int;
 460         if (cur_conf->beacon_interval == 0)
 461                 cur_conf->beacon_interval = 100;
 462
 463         cur_conf->dtim_period = bss_conf->dtim_period;
 464         cur_conf->bmiss_timeout =
 465                 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
 466
 467         switch (vif->type) {
 468         case NL80211_IFTYPE_STATION:
 469                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 470                 avp->beacon_configured = true;
 471                 break;
 472         case NL80211_IFTYPE_ADHOC:
 473                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 474                 break;
 475         case NL80211_IFTYPE_MESH_POINT:
 476         case NL80211_IFTYPE_AP:
 477                 ath9k_htc_beacon_config_ap(priv, cur_conf);
 478                 break;
 479         default:
 480                 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
 481                 return;
 482         }
 483 }
 484
 485 void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
 486 {
 487         struct ath_common *common = ath9k_hw_common(priv->ah);
 488         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 489
 490         switch (priv->ah->opmode) {
 491         case NL80211_IFTYPE_STATION:
 492                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 493                 break;
 494         case NL80211_IFTYPE_ADHOC:
 495                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 496                 break;
 497         case NL80211_IFTYPE_MESH_POINT:
 498         case NL80211_IFTYPE_AP:
 499                 ath9k_htc_beacon_config_ap(priv, cur_conf);
 500                 break;
 501         default:
 502                 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
 503                 return;
 504         }
 505 }