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 == 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         ath9k_htc_csa_is_finished(priv);
 262 }
 263
 264 static int ath9k_htc_choose_bslot(struct ath9k_htc_priv *priv,
 265                                   struct wmi_event_swba *swba)
 266 {
 267         struct ath_common *common = ath9k_hw_common(priv->ah);
 268         u64 tsf;
 269         u32 tsftu;
 270         u16 intval;
 271         int slot;
 272
 273         intval = priv->cur_beacon_conf.beacon_interval;
 274
 275         tsf = be64_to_cpu(swba->tsf);
 276         tsftu = TSF_TO_TU(tsf >> 32, tsf);
 277         slot = ((tsftu % intval) * ATH9K_HTC_MAX_BCN_VIF) / intval;
 278         slot = ATH9K_HTC_MAX_BCN_VIF - slot - 1;
 279
 280         ath_dbg(common, BEACON,
 281                 "Choose slot: %d, tsf: %llu, tsftu: %u, intval: %u\n",
 282                 slot, tsf, tsftu, intval);
 283
 284         return slot;
 285 }
 286
 287 void ath9k_htc_swba(struct ath9k_htc_priv *priv,
 288                     struct wmi_event_swba *swba)
 289 {
 290         struct ath_common *common = ath9k_hw_common(priv->ah);
 291         int slot;
 292
 293         if (swba->beacon_pending != 0) {
 294                 priv->beacon.bmisscnt++;
 295                 if (priv->beacon.bmisscnt > BSTUCK_THRESHOLD) {
 296                         ath_dbg(common, BSTUCK, "Beacon stuck, HW reset\n");
 297                         ieee80211_queue_work(priv->hw,
 298                                              &priv->fatal_work);
 299                 }
 300                 return;
 301         }
 302
 303         if (priv->beacon.bmisscnt) {
 304                 ath_dbg(common, BSTUCK,
 305                         "Resuming beacon xmit after %u misses\n",
 306                         priv->beacon.bmisscnt);
 307                 priv->beacon.bmisscnt = 0;
 308         }
 309
 310         slot = ath9k_htc_choose_bslot(priv, swba);
 311         spin_lock_bh(&priv->beacon_lock);
 312         if (priv->beacon.bslot[slot] == NULL) {
 313                 spin_unlock_bh(&priv->beacon_lock);
 314                 return;
 315         }
 316         spin_unlock_bh(&priv->beacon_lock);
 317
 318         ath9k_htc_send_buffered(priv, slot);
 319         ath9k_htc_send_beacon(priv, slot);
 320 }
 321
 322 void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,
 323                             struct ieee80211_vif *vif)
 324 {
 325         struct ath_common *common = ath9k_hw_common(priv->ah);
 326         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
 327         int i = 0;
 328
 329         spin_lock_bh(&priv->beacon_lock);
 330         for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {
 331                 if (priv->beacon.bslot[i] == NULL) {
 332                         avp->bslot = i;
 333                         break;
 334                 }
 335         }
 336
 337         priv->beacon.bslot[avp->bslot] = vif;
 338         spin_unlock_bh(&priv->beacon_lock);
 339
 340         ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
 341                 avp->bslot);
 342 }
 343
 344 void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,
 345                             struct ieee80211_vif *vif)
 346 {
 347         struct ath_common *common = ath9k_hw_common(priv->ah);
 348         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
 349
 350         spin_lock_bh(&priv->beacon_lock);
 351         priv->beacon.bslot[avp->bslot] = NULL;
 352         spin_unlock_bh(&priv->beacon_lock);
 353
 354         ath_dbg(common, CONFIG, "Removed interface at beacon slot: %d\n",
 355                 avp->bslot);
 356 }
 357
 358 /*
 359  * Calculate the TSF adjustment value for all slots
 360  * other than zero.
 361  */
 362 void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,
 363                              struct ieee80211_vif *vif)
 364 {
 365         struct ath_common *common = ath9k_hw_common(priv->ah);
 366         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
 367         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 368         u64 tsfadjust;
 369
 370         if (avp->bslot == 0)
 371                 return;
 372
 373         /*
 374          * The beacon interval cannot be different for multi-AP mode,
 375          * and we reach here only for VIF slots greater than zero,
 376          * so beacon_interval is guaranteed to be set in cur_conf.
 377          */
 378         tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;
 379         avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
 380
 381         ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
 382                 (unsigned long long)tsfadjust, avp->bslot);
 383 }
 384
 385 static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 386 {
 387         bool *beacon_configured = data;
 388         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
 389
 390         if (vif->type == NL80211_IFTYPE_STATION &&
 391             avp->beacon_configured)
 392                 *beacon_configured = true;
 393 }
 394
 395 static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
 396                                           struct ieee80211_vif *vif)
 397 {
 398         struct ath_common *common = ath9k_hw_common(priv->ah);
 399         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 400         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 401         bool beacon_configured;
 402
 403         /*
 404          * Changing the beacon interval when multiple AP interfaces
 405          * are configured will affect beacon transmission of all
 406          * of them.
 407          */
 408         if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
 409             (priv->num_ap_vif > 1) &&
 410             (vif->type == NL80211_IFTYPE_AP) &&
 411             (cur_conf->beacon_interval != bss_conf->beacon_int)) {
 412                 ath_dbg(common, CONFIG,
 413                         "Changing beacon interval of multiple AP interfaces !\n");
 414                 return false;
 415         }
 416
 417         /*
 418          * If the HW is operating in AP mode, any new station interfaces that
 419          * are added cannot change the beacon parameters.
 420          */
 421         if (priv->num_ap_vif &&
 422             (vif->type != NL80211_IFTYPE_AP)) {
 423                 ath_dbg(common, CONFIG,
 424                         "HW in AP mode, cannot set STA beacon parameters\n");
 425                 return false;
 426         }
 427
 428         /*
 429          * The beacon parameters are configured only for the first
 430          * station interface.
 431          */
 432         if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
 433             (priv->num_sta_vif > 1) &&
 434             (vif->type == NL80211_IFTYPE_STATION)) {
 435                 beacon_configured = false;
 436                 ieee80211_iterate_active_interfaces_atomic(
 437                         priv->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 438                         ath9k_htc_beacon_iter, &beacon_configured);
 439
 440                 if (beacon_configured) {
 441                         ath_dbg(common, CONFIG,
 442                                 "Beacon already configured for a station interface\n");
 443                         return false;
 444                 }
 445         }
 446
 447         return true;
 448 }
 449
 450 void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
 451                              struct ieee80211_vif *vif)
 452 {
 453         struct ath_common *common = ath9k_hw_common(priv->ah);
 454         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 455         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 456         struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
 457
 458         if (!ath9k_htc_check_beacon_config(priv, vif))
 459                 return;
 460
 461         cur_conf->beacon_interval = bss_conf->beacon_int;
 462         if (cur_conf->beacon_interval == 0)
 463                 cur_conf->beacon_interval = 100;
 464
 465         cur_conf->dtim_period = bss_conf->dtim_period;
 466         cur_conf->bmiss_timeout =
 467                 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
 468
 469         switch (vif->type) {
 470         case NL80211_IFTYPE_STATION:
 471                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 472                 avp->beacon_configured = true;
 473                 break;
 474         case NL80211_IFTYPE_ADHOC:
 475                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 476                 break;
 477         case NL80211_IFTYPE_MESH_POINT:
 478         case NL80211_IFTYPE_AP:
 479                 ath9k_htc_beacon_config_ap(priv, cur_conf);
 480                 break;
 481         default:
 482                 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
 483                 return;
 484         }
 485 }
 486
 487 void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
 488 {
 489         struct ath_common *common = ath9k_hw_common(priv->ah);
 490         struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
 491
 492         switch (priv->ah->opmode) {
 493         case NL80211_IFTYPE_STATION:
 494                 ath9k_htc_beacon_config_sta(priv, cur_conf);
 495                 break;
 496         case NL80211_IFTYPE_ADHOC:
 497                 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
 498                 break;
 499         case NL80211_IFTYPE_MESH_POINT:
 500         case NL80211_IFTYPE_AP:
 501                 ath9k_htc_beacon_config_ap(priv, cur_conf);
 502                 break;
 503         default:
 504                 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
 505                 return;
 506         }
 507 }
 508
 509 bool ath9k_htc_csa_is_finished(struct ath9k_htc_priv *priv)
 510 {
 511         struct ieee80211_vif *vif;
 512
 513         vif = priv->csa_vif;
 514         if (!vif || !vif->csa_active)
 515                 return false;
 516
 517         if (!ieee80211_csa_is_complete(vif))
 518                 return false;
 519
 520         ieee80211_csa_finish(vif);
 521
 522         priv->csa_vif = NULL;
 523         return true;
 524 }