beacon.c 22 KB

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  1. /*
  2. * Copyright (c) 2008-2009 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. #include "ath9k.h"
  17. #define FUDGE 2
  18. /*
  19. * This function will modify certain transmit queue properties depending on
  20. * the operating mode of the station (AP or AdHoc). Parameters are AIFS
  21. * settings and channel width min/max
  22. */
  23. int ath_beaconq_config(struct ath_softc *sc)
  24. {
  25. struct ath_hw *ah = sc->sc_ah;
  26. struct ath_common *common = ath9k_hw_common(ah);
  27. struct ath9k_tx_queue_info qi, qi_be;
  28. struct ath_txq *txq;
  29. ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
  30. if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
  31. /* Always burst out beacon and CAB traffic. */
  32. qi.tqi_aifs = 1;
  33. qi.tqi_cwmin = 0;
  34. qi.tqi_cwmax = 0;
  35. } else {
  36. /* Adhoc mode; important thing is to use 2x cwmin. */
  37. txq = sc->tx.txq_map[WME_AC_BE];
  38. ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
  39. qi.tqi_aifs = qi_be.tqi_aifs;
  40. qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
  41. qi.tqi_cwmax = qi_be.tqi_cwmax;
  42. }
  43. if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
  44. ath_err(common,
  45. "Unable to update h/w beacon queue parameters\n");
  46. return 0;
  47. } else {
  48. ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
  49. return 1;
  50. }
  51. }
  52. /*
  53. * Associates the beacon frame buffer with a transmit descriptor. Will set
  54. * up rate codes, and channel flags. Beacons are always sent out at the
  55. * lowest rate, and are not retried.
  56. */
  57. static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
  58. struct ath_buf *bf, int rateidx)
  59. {
  60. struct sk_buff *skb = bf->bf_mpdu;
  61. struct ath_hw *ah = sc->sc_ah;
  62. struct ath_common *common = ath9k_hw_common(ah);
  63. struct ath_desc *ds;
  64. struct ath9k_11n_rate_series series[4];
  65. int flags, ctsrate = 0, ctsduration = 0;
  66. struct ieee80211_supported_band *sband;
  67. u8 rate = 0;
  68. ds = bf->bf_desc;
  69. flags = ATH9K_TXDESC_NOACK;
  70. ds->ds_link = 0;
  71. sband = &sc->sbands[common->hw->conf.channel->band];
  72. rate = sband->bitrates[rateidx].hw_value;
  73. if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
  74. rate |= sband->bitrates[rateidx].hw_value_short;
  75. ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
  76. ATH9K_PKT_TYPE_BEACON,
  77. MAX_RATE_POWER,
  78. ATH9K_TXKEYIX_INVALID,
  79. ATH9K_KEY_TYPE_CLEAR,
  80. flags);
  81. /* NB: beacon's BufLen must be a multiple of 4 bytes */
  82. ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
  83. true, true, ds, bf->bf_buf_addr,
  84. sc->beacon.beaconq);
  85. memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
  86. series[0].Tries = 1;
  87. series[0].Rate = rate;
  88. series[0].ChSel = ath_txchainmask_reduction(sc,
  89. common->tx_chainmask, series[0].Rate);
  90. series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
  91. ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
  92. series, 4, 0);
  93. }
  94. static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
  95. {
  96. struct ath_softc *sc = hw->priv;
  97. struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  98. struct ath_tx_control txctl;
  99. memset(&txctl, 0, sizeof(struct ath_tx_control));
  100. txctl.txq = sc->beacon.cabq;
  101. ath_dbg(common, ATH_DBG_XMIT,
  102. "transmitting CABQ packet, skb: %p\n", skb);
  103. if (ath_tx_start(hw, skb, &txctl) != 0) {
  104. ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n");
  105. dev_kfree_skb_any(skb);
  106. }
  107. }
  108. static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
  109. struct ieee80211_vif *vif)
  110. {
  111. struct ath_softc *sc = hw->priv;
  112. struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  113. struct ath_buf *bf;
  114. struct ath_vif *avp;
  115. struct sk_buff *skb;
  116. struct ath_txq *cabq;
  117. struct ieee80211_tx_info *info;
  118. int cabq_depth;
  119. avp = (void *)vif->drv_priv;
  120. cabq = sc->beacon.cabq;
  121. if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
  122. return NULL;
  123. /* Release the old beacon first */
  124. bf = avp->av_bcbuf;
  125. skb = bf->bf_mpdu;
  126. if (skb) {
  127. dma_unmap_single(sc->dev, bf->bf_buf_addr,
  128. skb->len, DMA_TO_DEVICE);
  129. dev_kfree_skb_any(skb);
  130. bf->bf_buf_addr = 0;
  131. }
  132. /* Get a new beacon from mac80211 */
  133. skb = ieee80211_beacon_get(hw, vif);
  134. bf->bf_mpdu = skb;
  135. if (skb == NULL)
  136. return NULL;
  137. ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
  138. avp->tsf_adjust;
  139. info = IEEE80211_SKB_CB(skb);
  140. if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
  141. /*
  142. * TODO: make sure the seq# gets assigned properly (vs. other
  143. * TX frames)
  144. */
  145. struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  146. sc->tx.seq_no += 0x10;
  147. hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
  148. hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
  149. }
  150. bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
  151. skb->len, DMA_TO_DEVICE);
  152. if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
  153. dev_kfree_skb_any(skb);
  154. bf->bf_mpdu = NULL;
  155. bf->bf_buf_addr = 0;
  156. ath_err(common, "dma_mapping_error on beaconing\n");
  157. return NULL;
  158. }
  159. skb = ieee80211_get_buffered_bc(hw, vif);
  160. /*
  161. * if the CABQ traffic from previous DTIM is pending and the current
  162. * beacon is also a DTIM.
  163. * 1) if there is only one vif let the cab traffic continue.
  164. * 2) if there are more than one vif and we are using staggered
  165. * beacons, then drain the cabq by dropping all the frames in
  166. * the cabq so that the current vifs cab traffic can be scheduled.
  167. */
  168. spin_lock_bh(&cabq->axq_lock);
  169. cabq_depth = cabq->axq_depth;
  170. spin_unlock_bh(&cabq->axq_lock);
  171. if (skb && cabq_depth) {
  172. if (sc->nvifs > 1) {
  173. ath_dbg(common, ATH_DBG_BEACON,
  174. "Flushing previous cabq traffic\n");
  175. ath_draintxq(sc, cabq, false);
  176. }
  177. }
  178. ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
  179. while (skb) {
  180. ath_tx_cabq(hw, skb);
  181. skb = ieee80211_get_buffered_bc(hw, vif);
  182. }
  183. return bf;
  184. }
  185. int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
  186. {
  187. struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  188. struct ath_vif *avp;
  189. struct ath_buf *bf;
  190. struct sk_buff *skb;
  191. struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
  192. __le64 tstamp;
  193. avp = (void *)vif->drv_priv;
  194. /* Allocate a beacon descriptor if we haven't done so. */
  195. if (!avp->av_bcbuf) {
  196. /* Allocate beacon state for hostap/ibss. We know
  197. * a buffer is available. */
  198. avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
  199. struct ath_buf, list);
  200. list_del(&avp->av_bcbuf->list);
  201. if (ath9k_uses_beacons(vif->type)) {
  202. int slot;
  203. /*
  204. * Assign the vif to a beacon xmit slot. As
  205. * above, this cannot fail to find one.
  206. */
  207. avp->av_bslot = 0;
  208. for (slot = 0; slot < ATH_BCBUF; slot++)
  209. if (sc->beacon.bslot[slot] == NULL) {
  210. avp->av_bslot = slot;
  211. avp->is_bslot_active = false;
  212. /* NB: keep looking for a double slot */
  213. if (slot == 0 || !sc->beacon.bslot[slot-1])
  214. break;
  215. }
  216. BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
  217. sc->beacon.bslot[avp->av_bslot] = vif;
  218. sc->nbcnvifs++;
  219. }
  220. }
  221. /* release the previous beacon frame, if it already exists. */
  222. bf = avp->av_bcbuf;
  223. if (bf->bf_mpdu != NULL) {
  224. skb = bf->bf_mpdu;
  225. dma_unmap_single(sc->dev, bf->bf_buf_addr,
  226. skb->len, DMA_TO_DEVICE);
  227. dev_kfree_skb_any(skb);
  228. bf->bf_mpdu = NULL;
  229. bf->bf_buf_addr = 0;
  230. }
  231. /* NB: the beacon data buffer must be 32-bit aligned. */
  232. skb = ieee80211_beacon_get(sc->hw, vif);
  233. if (skb == NULL)
  234. return -ENOMEM;
  235. tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
  236. sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
  237. /* Calculate a TSF adjustment factor required for staggered beacons. */
  238. if (avp->av_bslot > 0) {
  239. u64 tsfadjust;
  240. int intval;
  241. intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
  242. /*
  243. * Calculate the TSF offset for this beacon slot, i.e., the
  244. * number of usecs that need to be added to the timestamp field
  245. * in Beacon and Probe Response frames. Beacon slot 0 is
  246. * processed at the correct offset, so it does not require TSF
  247. * adjustment. Other slots are adjusted to get the timestamp
  248. * close to the TBTT for the BSS.
  249. */
  250. tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
  251. avp->tsf_adjust = cpu_to_le64(tsfadjust);
  252. ath_dbg(common, ATH_DBG_BEACON,
  253. "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
  254. avp->av_bslot, intval, (unsigned long long)tsfadjust);
  255. ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
  256. avp->tsf_adjust;
  257. } else
  258. avp->tsf_adjust = cpu_to_le64(0);
  259. bf->bf_mpdu = skb;
  260. bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
  261. skb->len, DMA_TO_DEVICE);
  262. if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
  263. dev_kfree_skb_any(skb);
  264. bf->bf_mpdu = NULL;
  265. bf->bf_buf_addr = 0;
  266. ath_err(common, "dma_mapping_error on beacon alloc\n");
  267. return -ENOMEM;
  268. }
  269. avp->is_bslot_active = true;
  270. return 0;
  271. }
  272. void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
  273. {
  274. if (avp->av_bcbuf != NULL) {
  275. struct ath_buf *bf;
  276. if (avp->av_bslot != -1) {
  277. sc->beacon.bslot[avp->av_bslot] = NULL;
  278. sc->nbcnvifs--;
  279. }
  280. bf = avp->av_bcbuf;
  281. if (bf->bf_mpdu != NULL) {
  282. struct sk_buff *skb = bf->bf_mpdu;
  283. dma_unmap_single(sc->dev, bf->bf_buf_addr,
  284. skb->len, DMA_TO_DEVICE);
  285. dev_kfree_skb_any(skb);
  286. bf->bf_mpdu = NULL;
  287. bf->bf_buf_addr = 0;
  288. }
  289. list_add_tail(&bf->list, &sc->beacon.bbuf);
  290. avp->av_bcbuf = NULL;
  291. }
  292. }
  293. void ath_beacon_tasklet(unsigned long data)
  294. {
  295. struct ath_softc *sc = (struct ath_softc *)data;
  296. struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
  297. struct ath_hw *ah = sc->sc_ah;
  298. struct ath_common *common = ath9k_hw_common(ah);
  299. struct ath_buf *bf = NULL;
  300. struct ieee80211_vif *vif;
  301. int slot;
  302. u32 bfaddr, bc = 0, tsftu;
  303. u64 tsf;
  304. u16 intval;
  305. /*
  306. * Check if the previous beacon has gone out. If
  307. * not don't try to post another, skip this period
  308. * and wait for the next. Missed beacons indicate
  309. * a problem and should not occur. If we miss too
  310. * many consecutive beacons reset the device.
  311. */
  312. if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
  313. sc->beacon.bmisscnt++;
  314. if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
  315. ath_dbg(common, ATH_DBG_BSTUCK,
  316. "missed %u consecutive beacons\n",
  317. sc->beacon.bmisscnt);
  318. ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
  319. if (sc->beacon.bmisscnt > 3)
  320. ath9k_hw_bstuck_nfcal(ah);
  321. } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
  322. ath_dbg(common, ATH_DBG_BSTUCK,
  323. "beacon is officially stuck\n");
  324. sc->sc_flags |= SC_OP_TSF_RESET;
  325. ath_reset(sc, true);
  326. }
  327. return;
  328. }
  329. /*
  330. * Generate beacon frames. we are sending frames
  331. * staggered so calculate the slot for this frame based
  332. * on the tsf to safeguard against missing an swba.
  333. */
  334. intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
  335. tsf = ath9k_hw_gettsf64(ah);
  336. tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
  337. tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
  338. slot = (tsftu % (intval * ATH_BCBUF)) / intval;
  339. /*
  340. * Reverse the slot order to get slot 0 on the TBTT offset that does
  341. * not require TSF adjustment and other slots adding
  342. * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
  343. * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
  344. * and slot 0 is at correct offset to TBTT.
  345. */
  346. slot = ATH_BCBUF - slot - 1;
  347. vif = sc->beacon.bslot[slot];
  348. ath_dbg(common, ATH_DBG_BEACON,
  349. "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
  350. slot, tsf, tsftu / ATH_BCBUF, intval, vif);
  351. bfaddr = 0;
  352. if (vif) {
  353. bf = ath_beacon_generate(sc->hw, vif);
  354. if (bf != NULL) {
  355. bfaddr = bf->bf_daddr;
  356. bc = 1;
  357. }
  358. if (sc->beacon.bmisscnt != 0) {
  359. ath_dbg(common, ATH_DBG_BSTUCK,
  360. "resume beacon xmit after %u misses\n",
  361. sc->beacon.bmisscnt);
  362. sc->beacon.bmisscnt = 0;
  363. }
  364. }
  365. /*
  366. * Handle slot time change when a non-ERP station joins/leaves
  367. * an 11g network. The 802.11 layer notifies us via callback,
  368. * we mark updateslot, then wait one beacon before effecting
  369. * the change. This gives associated stations at least one
  370. * beacon interval to note the state change.
  371. *
  372. * NB: The slot time change state machine is clocked according
  373. * to whether we are bursting or staggering beacons. We
  374. * recognize the request to update and record the current
  375. * slot then don't transition until that slot is reached
  376. * again. If we miss a beacon for that slot then we'll be
  377. * slow to transition but we'll be sure at least one beacon
  378. * interval has passed. When bursting slot is always left
  379. * set to ATH_BCBUF so this check is a noop.
  380. */
  381. if (sc->beacon.updateslot == UPDATE) {
  382. sc->beacon.updateslot = COMMIT; /* commit next beacon */
  383. sc->beacon.slotupdate = slot;
  384. } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
  385. ah->slottime = sc->beacon.slottime;
  386. ath9k_hw_init_global_settings(ah);
  387. sc->beacon.updateslot = OK;
  388. }
  389. if (bfaddr != 0) {
  390. /* NB: cabq traffic should already be queued and primed */
  391. ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
  392. ath9k_hw_txstart(ah, sc->beacon.beaconq);
  393. sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
  394. }
  395. }
  396. static void ath9k_beacon_init(struct ath_softc *sc,
  397. u32 next_beacon,
  398. u32 beacon_period)
  399. {
  400. if (sc->sc_flags & SC_OP_TSF_RESET) {
  401. ath9k_ps_wakeup(sc);
  402. ath9k_hw_reset_tsf(sc->sc_ah);
  403. }
  404. ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
  405. if (sc->sc_flags & SC_OP_TSF_RESET) {
  406. ath9k_ps_restore(sc);
  407. sc->sc_flags &= ~SC_OP_TSF_RESET;
  408. }
  409. }
  410. /*
  411. * For multi-bss ap support beacons are either staggered evenly over N slots or
  412. * burst together. For the former arrange for the SWBA to be delivered for each
  413. * slot. Slots that are not occupied will generate nothing.
  414. */
  415. static void ath_beacon_config_ap(struct ath_softc *sc,
  416. struct ath_beacon_config *conf)
  417. {
  418. struct ath_hw *ah = sc->sc_ah;
  419. u32 nexttbtt, intval;
  420. /* NB: the beacon interval is kept internally in TU's */
  421. intval = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
  422. intval /= ATH_BCBUF; /* for staggered beacons */
  423. nexttbtt = intval;
  424. /*
  425. * In AP mode we enable the beacon timers and SWBA interrupts to
  426. * prepare beacon frames.
  427. */
  428. ah->imask |= ATH9K_INT_SWBA;
  429. ath_beaconq_config(sc);
  430. /* Set the computed AP beacon timers */
  431. ath9k_hw_disable_interrupts(ah);
  432. ath9k_beacon_init(sc, nexttbtt, intval);
  433. sc->beacon.bmisscnt = 0;
  434. ath9k_hw_set_interrupts(ah, ah->imask);
  435. }
  436. /*
  437. * This sets up the beacon timers according to the timestamp of the last
  438. * received beacon and the current TSF, configures PCF and DTIM
  439. * handling, programs the sleep registers so the hardware will wakeup in
  440. * time to receive beacons, and configures the beacon miss handling so
  441. * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
  442. * we've associated with.
  443. */
  444. static void ath_beacon_config_sta(struct ath_softc *sc,
  445. struct ath_beacon_config *conf)
  446. {
  447. struct ath_hw *ah = sc->sc_ah;
  448. struct ath_common *common = ath9k_hw_common(ah);
  449. struct ath9k_beacon_state bs;
  450. int dtimperiod, dtimcount, sleepduration;
  451. int cfpperiod, cfpcount;
  452. u32 nexttbtt = 0, intval, tsftu;
  453. u64 tsf;
  454. int num_beacons, offset, dtim_dec_count, cfp_dec_count;
  455. /* No need to configure beacon if we are not associated */
  456. if (!common->curaid) {
  457. ath_dbg(common, ATH_DBG_BEACON,
  458. "STA is not yet associated..skipping beacon config\n");
  459. return;
  460. }
  461. memset(&bs, 0, sizeof(bs));
  462. intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
  463. /*
  464. * Setup dtim and cfp parameters according to
  465. * last beacon we received (which may be none).
  466. */
  467. dtimperiod = conf->dtim_period;
  468. dtimcount = conf->dtim_count;
  469. if (dtimcount >= dtimperiod) /* NB: sanity check */
  470. dtimcount = 0;
  471. cfpperiod = 1; /* NB: no PCF support yet */
  472. cfpcount = 0;
  473. sleepduration = conf->listen_interval * intval;
  474. /*
  475. * Pull nexttbtt forward to reflect the current
  476. * TSF and calculate dtim+cfp state for the result.
  477. */
  478. tsf = ath9k_hw_gettsf64(ah);
  479. tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
  480. num_beacons = tsftu / intval + 1;
  481. offset = tsftu % intval;
  482. nexttbtt = tsftu - offset;
  483. if (offset)
  484. nexttbtt += intval;
  485. /* DTIM Beacon every dtimperiod Beacon */
  486. dtim_dec_count = num_beacons % dtimperiod;
  487. /* CFP every cfpperiod DTIM Beacon */
  488. cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
  489. if (dtim_dec_count)
  490. cfp_dec_count++;
  491. dtimcount -= dtim_dec_count;
  492. if (dtimcount < 0)
  493. dtimcount += dtimperiod;
  494. cfpcount -= cfp_dec_count;
  495. if (cfpcount < 0)
  496. cfpcount += cfpperiod;
  497. bs.bs_intval = intval;
  498. bs.bs_nexttbtt = nexttbtt;
  499. bs.bs_dtimperiod = dtimperiod*intval;
  500. bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
  501. bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
  502. bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
  503. bs.bs_cfpmaxduration = 0;
  504. /*
  505. * Calculate the number of consecutive beacons to miss* before taking
  506. * a BMISS interrupt. The configuration is specified in TU so we only
  507. * need calculate based on the beacon interval. Note that we clamp the
  508. * result to at most 15 beacons.
  509. */
  510. if (sleepduration > intval) {
  511. bs.bs_bmissthreshold = conf->listen_interval *
  512. ATH_DEFAULT_BMISS_LIMIT / 2;
  513. } else {
  514. bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
  515. if (bs.bs_bmissthreshold > 15)
  516. bs.bs_bmissthreshold = 15;
  517. else if (bs.bs_bmissthreshold <= 0)
  518. bs.bs_bmissthreshold = 1;
  519. }
  520. /*
  521. * Calculate sleep duration. The configuration is given in ms.
  522. * We ensure a multiple of the beacon period is used. Also, if the sleep
  523. * duration is greater than the DTIM period then it makes senses
  524. * to make it a multiple of that.
  525. *
  526. * XXX fixed at 100ms
  527. */
  528. bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
  529. if (bs.bs_sleepduration > bs.bs_dtimperiod)
  530. bs.bs_sleepduration = bs.bs_dtimperiod;
  531. /* TSF out of range threshold fixed at 1 second */
  532. bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
  533. ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
  534. ath_dbg(common, ATH_DBG_BEACON,
  535. "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
  536. bs.bs_bmissthreshold, bs.bs_sleepduration,
  537. bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
  538. /* Set the computed STA beacon timers */
  539. ath9k_hw_disable_interrupts(ah);
  540. ath9k_hw_set_sta_beacon_timers(ah, &bs);
  541. ah->imask |= ATH9K_INT_BMISS;
  542. ath9k_hw_set_interrupts(ah, ah->imask);
  543. }
  544. static void ath_beacon_config_adhoc(struct ath_softc *sc,
  545. struct ath_beacon_config *conf)
  546. {
  547. struct ath_hw *ah = sc->sc_ah;
  548. struct ath_common *common = ath9k_hw_common(ah);
  549. u32 tsf, delta, intval, nexttbtt;
  550. tsf = ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE);
  551. intval = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
  552. if (!sc->beacon.bc_tstamp)
  553. nexttbtt = tsf + intval;
  554. else {
  555. if (tsf > sc->beacon.bc_tstamp)
  556. delta = (tsf - sc->beacon.bc_tstamp);
  557. else
  558. delta = (tsf + 1 + (~0U - sc->beacon.bc_tstamp));
  559. nexttbtt = tsf + roundup(delta, intval);
  560. }
  561. ath_dbg(common, ATH_DBG_BEACON,
  562. "IBSS nexttbtt %u intval %u (%u)\n",
  563. nexttbtt, intval, conf->beacon_interval);
  564. /*
  565. * In IBSS mode enable the beacon timers but only enable SWBA interrupts
  566. * if we need to manually prepare beacon frames. Otherwise we use a
  567. * self-linked tx descriptor and let the hardware deal with things.
  568. */
  569. ah->imask |= ATH9K_INT_SWBA;
  570. ath_beaconq_config(sc);
  571. /* Set the computed ADHOC beacon timers */
  572. ath9k_hw_disable_interrupts(ah);
  573. ath9k_beacon_init(sc, nexttbtt, intval);
  574. sc->beacon.bmisscnt = 0;
  575. ath9k_hw_set_interrupts(ah, ah->imask);
  576. }
  577. void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
  578. {
  579. struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
  580. struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  581. enum nl80211_iftype iftype;
  582. /* Setup the beacon configuration parameters */
  583. if (vif) {
  584. struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
  585. iftype = vif->type;
  586. cur_conf->beacon_interval = bss_conf->beacon_int;
  587. cur_conf->dtim_period = bss_conf->dtim_period;
  588. } else {
  589. iftype = sc->sc_ah->opmode;
  590. }
  591. cur_conf->listen_interval = 1;
  592. cur_conf->dtim_count = 1;
  593. cur_conf->bmiss_timeout =
  594. ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
  595. /*
  596. * It looks like mac80211 may end up using beacon interval of zero in
  597. * some cases (at least for mesh point). Avoid getting into an
  598. * infinite loop by using a bit safer value instead. To be safe,
  599. * do sanity check on beacon interval for all operating modes.
  600. */
  601. if (cur_conf->beacon_interval == 0)
  602. cur_conf->beacon_interval = 100;
  603. /*
  604. * We don't parse dtim period from mac80211 during the driver
  605. * initialization as it breaks association with hidden-ssid
  606. * AP and it causes latency in roaming
  607. */
  608. if (cur_conf->dtim_period == 0)
  609. cur_conf->dtim_period = 1;
  610. switch (iftype) {
  611. case NL80211_IFTYPE_AP:
  612. ath_beacon_config_ap(sc, cur_conf);
  613. break;
  614. case NL80211_IFTYPE_ADHOC:
  615. case NL80211_IFTYPE_MESH_POINT:
  616. ath_beacon_config_adhoc(sc, cur_conf);
  617. break;
  618. case NL80211_IFTYPE_STATION:
  619. ath_beacon_config_sta(sc, cur_conf);
  620. break;
  621. default:
  622. ath_dbg(common, ATH_DBG_CONFIG,
  623. "Unsupported beaconing mode\n");
  624. return;
  625. }
  626. sc->sc_flags |= SC_OP_BEACONS;
  627. }
  628. void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
  629. {
  630. struct ath_hw *ah = sc->sc_ah;
  631. struct ath_vif *avp;
  632. int slot;
  633. bool found = false;
  634. ath9k_ps_wakeup(sc);
  635. if (status) {
  636. for (slot = 0; slot < ATH_BCBUF; slot++) {
  637. if (sc->beacon.bslot[slot]) {
  638. avp = (void *)sc->beacon.bslot[slot]->drv_priv;
  639. if (avp->is_bslot_active) {
  640. found = true;
  641. break;
  642. }
  643. }
  644. }
  645. if (found) {
  646. /* Re-enable beaconing */
  647. ah->imask |= ATH9K_INT_SWBA;
  648. ath9k_hw_set_interrupts(ah, ah->imask);
  649. }
  650. } else {
  651. /* Disable SWBA interrupt */
  652. ah->imask &= ~ATH9K_INT_SWBA;
  653. ath9k_hw_set_interrupts(ah, ah->imask);
  654. tasklet_kill(&sc->bcon_tasklet);
  655. ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
  656. }
  657. ath9k_ps_restore(sc);
  658. }