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 21void 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 */ 68static 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 92static 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 111static 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 121static 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 131void 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 137static 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 191static 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 262static 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 285void 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 320void 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 342void 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 */ 360void 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 383static 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 393static 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 448void 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 485void 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} 506