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 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 = (bool *)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 } 525