Commit | Line | Data |
---|---|---|
f078f209 | 1 | /* |
5b68138e | 2 | * Copyright (c) 2008-2011 Atheros Communications Inc. |
f078f209 LR |
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 | ||
b7f080cf | 17 | #include <linux/dma-mapping.h> |
394cf0a1 | 18 | #include "ath9k.h" |
f078f209 | 19 | |
5379c8a2 S |
20 | #define FUDGE 2 |
21 | ||
ba4903f9 FF |
22 | static void ath9k_reset_beacon_status(struct ath_softc *sc) |
23 | { | |
24 | sc->beacon.tx_processed = false; | |
25 | sc->beacon.tx_last = false; | |
26 | } | |
27 | ||
f078f209 | 28 | /* |
f078f209 LR |
29 | * This function will modify certain transmit queue properties depending on |
30 | * the operating mode of the station (AP or AdHoc). Parameters are AIFS | |
31 | * settings and channel width min/max | |
32 | */ | |
94db2936 | 33 | int ath_beaconq_config(struct ath_softc *sc) |
f078f209 | 34 | { |
cbe61d8a | 35 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 36 | struct ath_common *common = ath9k_hw_common(ah); |
94db2936 | 37 | struct ath9k_tx_queue_info qi, qi_be; |
066dae93 | 38 | struct ath_txq *txq; |
f078f209 | 39 | |
b77f483f | 40 | ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi); |
2660b81a | 41 | if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { |
f078f209 LR |
42 | /* Always burst out beacon and CAB traffic. */ |
43 | qi.tqi_aifs = 1; | |
44 | qi.tqi_cwmin = 0; | |
45 | qi.tqi_cwmax = 0; | |
46 | } else { | |
47 | /* Adhoc mode; important thing is to use 2x cwmin. */ | |
066dae93 FF |
48 | txq = sc->tx.txq_map[WME_AC_BE]; |
49 | ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be); | |
94db2936 VN |
50 | qi.tqi_aifs = qi_be.tqi_aifs; |
51 | qi.tqi_cwmin = 4*qi_be.tqi_cwmin; | |
52 | qi.tqi_cwmax = qi_be.tqi_cwmax; | |
f078f209 LR |
53 | } |
54 | ||
b77f483f | 55 | if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { |
3800276a JP |
56 | ath_err(common, |
57 | "Unable to update h/w beacon queue parameters\n"); | |
f078f209 LR |
58 | return 0; |
59 | } else { | |
9fc9ab0a | 60 | ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); |
f078f209 LR |
61 | return 1; |
62 | } | |
63 | } | |
64 | ||
65 | /* | |
f078f209 | 66 | * Associates the beacon frame buffer with a transmit descriptor. Will set |
dd347f2f FF |
67 | * up rate codes, and channel flags. Beacons are always sent out at the |
68 | * lowest rate, and are not retried. | |
f078f209 | 69 | */ |
9fc9ab0a | 70 | static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp, |
64b84010 | 71 | struct ath_buf *bf, int rateidx) |
f078f209 | 72 | { |
a22be22a | 73 | struct sk_buff *skb = bf->bf_mpdu; |
cbe61d8a | 74 | struct ath_hw *ah = sc->sc_ah; |
43c27613 | 75 | struct ath_common *common = ath9k_hw_common(ah); |
493cf04f | 76 | struct ath_tx_info info; |
545750d3 | 77 | struct ieee80211_supported_band *sband; |
493cf04f | 78 | u8 chainmask = ah->txchainmask; |
545750d3 | 79 | u8 rate = 0; |
f078f209 | 80 | |
ba4903f9 FF |
81 | ath9k_reset_beacon_status(sc); |
82 | ||
545750d3 | 83 | sband = &sc->sbands[common->hw->conf.channel->band]; |
64b84010 | 84 | rate = sband->bitrates[rateidx].hw_value; |
672840ac | 85 | if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) |
64b84010 | 86 | rate |= sband->bitrates[rateidx].hw_value_short; |
9fc9ab0a | 87 | |
493cf04f FF |
88 | memset(&info, 0, sizeof(info)); |
89 | info.pkt_len = skb->len + FCS_LEN; | |
90 | info.type = ATH9K_PKT_TYPE_BEACON; | |
91 | info.txpower = MAX_RATE_POWER; | |
92 | info.keyix = ATH9K_TXKEYIX_INVALID; | |
93 | info.keytype = ATH9K_KEY_TYPE_CLEAR; | |
94 | info.flags = ATH9K_TXDESC_NOACK; | |
95 | ||
96 | info.buf_addr[0] = bf->bf_buf_addr; | |
97 | info.buf_len[0] = roundup(skb->len, 4); | |
98 | ||
99 | info.is_first = true; | |
100 | info.is_last = true; | |
101 | ||
102 | info.qcu = sc->beacon.beaconq; | |
103 | ||
104 | info.rates[0].Tries = 1; | |
105 | info.rates[0].Rate = rate; | |
106 | info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate); | |
107 | ||
108 | ath9k_hw_set_txdesc(ah, bf->bf_desc, &info); | |
f078f209 LR |
109 | } |
110 | ||
28d16708 FF |
111 | static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb) |
112 | { | |
9ac58615 | 113 | struct ath_softc *sc = hw->priv; |
28d16708 FF |
114 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
115 | struct ath_tx_control txctl; | |
116 | ||
117 | memset(&txctl, 0, sizeof(struct ath_tx_control)); | |
118 | txctl.txq = sc->beacon.cabq; | |
119 | ||
226afe68 JP |
120 | ath_dbg(common, ATH_DBG_XMIT, |
121 | "transmitting CABQ packet, skb: %p\n", skb); | |
28d16708 FF |
122 | |
123 | if (ath_tx_start(hw, skb, &txctl) != 0) { | |
226afe68 | 124 | ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n"); |
28d16708 FF |
125 | dev_kfree_skb_any(skb); |
126 | } | |
127 | } | |
128 | ||
c52f33d0 | 129 | static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw, |
2c3db3d5 | 130 | struct ieee80211_vif *vif) |
f078f209 | 131 | { |
9ac58615 | 132 | struct ath_softc *sc = hw->priv; |
c46917bb | 133 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
f078f209 | 134 | struct ath_buf *bf; |
17d7904d | 135 | struct ath_vif *avp; |
f078f209 | 136 | struct sk_buff *skb; |
f078f209 | 137 | struct ath_txq *cabq; |
147583c0 | 138 | struct ieee80211_tx_info *info; |
980b24da S |
139 | int cabq_depth; |
140 | ||
ba4903f9 FF |
141 | ath9k_reset_beacon_status(sc); |
142 | ||
5640b08e | 143 | avp = (void *)vif->drv_priv; |
b77f483f | 144 | cabq = sc->beacon.cabq; |
f078f209 | 145 | |
014cf3bb | 146 | if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active) |
f078f209 | 147 | return NULL; |
980b24da | 148 | |
9fc9ab0a S |
149 | /* Release the old beacon first */ |
150 | ||
f078f209 | 151 | bf = avp->av_bcbuf; |
a22be22a | 152 | skb = bf->bf_mpdu; |
a8fff50e | 153 | if (skb) { |
c1739eb3 | 154 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 155 | skb->len, DMA_TO_DEVICE); |
3fbb9d95 | 156 | dev_kfree_skb_any(skb); |
6cf9e995 | 157 | bf->bf_buf_addr = 0; |
a8fff50e | 158 | } |
f078f209 | 159 | |
9fc9ab0a S |
160 | /* Get a new beacon from mac80211 */ |
161 | ||
c52f33d0 | 162 | skb = ieee80211_beacon_get(hw, vif); |
a8fff50e JM |
163 | bf->bf_mpdu = skb; |
164 | if (skb == NULL) | |
165 | return NULL; | |
4ed96f04 JM |
166 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
167 | avp->tsf_adjust; | |
980b24da | 168 | |
147583c0 JM |
169 | info = IEEE80211_SKB_CB(skb); |
170 | if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { | |
171 | /* | |
172 | * TODO: make sure the seq# gets assigned properly (vs. other | |
173 | * TX frames) | |
174 | */ | |
980b24da | 175 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b77f483f | 176 | sc->tx.seq_no += 0x10; |
147583c0 | 177 | hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); |
b77f483f | 178 | hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); |
147583c0 | 179 | } |
980b24da | 180 | |
c1739eb3 BG |
181 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
182 | skb->len, DMA_TO_DEVICE); | |
7da3c55c | 183 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
184 | dev_kfree_skb_any(skb); |
185 | bf->bf_mpdu = NULL; | |
6cf9e995 | 186 | bf->bf_buf_addr = 0; |
3800276a | 187 | ath_err(common, "dma_mapping_error on beaconing\n"); |
f8316df1 LR |
188 | return NULL; |
189 | } | |
f078f209 | 190 | |
c52f33d0 | 191 | skb = ieee80211_get_buffered_bc(hw, vif); |
f078f209 | 192 | |
f078f209 LR |
193 | /* |
194 | * if the CABQ traffic from previous DTIM is pending and the current | |
195 | * beacon is also a DTIM. | |
17d7904d S |
196 | * 1) if there is only one vif let the cab traffic continue. |
197 | * 2) if there are more than one vif and we are using staggered | |
f078f209 | 198 | * beacons, then drain the cabq by dropping all the frames in |
17d7904d | 199 | * the cabq so that the current vifs cab traffic can be scheduled. |
f078f209 LR |
200 | */ |
201 | spin_lock_bh(&cabq->axq_lock); | |
202 | cabq_depth = cabq->axq_depth; | |
203 | spin_unlock_bh(&cabq->axq_lock); | |
204 | ||
e022edbd | 205 | if (skb && cabq_depth) { |
17d7904d | 206 | if (sc->nvifs > 1) { |
226afe68 JP |
207 | ath_dbg(common, ATH_DBG_BEACON, |
208 | "Flushing previous cabq traffic\n"); | |
9fc9ab0a | 209 | ath_draintxq(sc, cabq, false); |
f078f209 LR |
210 | } |
211 | } | |
212 | ||
64b84010 | 213 | ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx); |
f078f209 | 214 | |
e022edbd | 215 | while (skb) { |
c52f33d0 JM |
216 | ath_tx_cabq(hw, skb); |
217 | skb = ieee80211_get_buffered_bc(hw, vif); | |
e022edbd | 218 | } |
f078f209 | 219 | |
f078f209 LR |
220 | return bf; |
221 | } | |
222 | ||
9ac58615 | 223 | int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif) |
f078f209 | 224 | { |
c46917bb | 225 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
17d7904d | 226 | struct ath_vif *avp; |
f078f209 LR |
227 | struct ath_buf *bf; |
228 | struct sk_buff *skb; | |
9814f6b3 | 229 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
459f5f90 | 230 | __le64 tstamp; |
f078f209 | 231 | |
5640b08e | 232 | avp = (void *)vif->drv_priv; |
f078f209 LR |
233 | |
234 | /* Allocate a beacon descriptor if we haven't done so. */ | |
235 | if (!avp->av_bcbuf) { | |
980b24da S |
236 | /* Allocate beacon state for hostap/ibss. We know |
237 | * a buffer is available. */ | |
b77f483f | 238 | avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, |
980b24da | 239 | struct ath_buf, list); |
f078f209 LR |
240 | list_del(&avp->av_bcbuf->list); |
241 | ||
4801416c | 242 | if (ath9k_uses_beacons(vif->type)) { |
f078f209 LR |
243 | int slot; |
244 | /* | |
17d7904d | 245 | * Assign the vif to a beacon xmit slot. As |
f078f209 LR |
246 | * above, this cannot fail to find one. |
247 | */ | |
248 | avp->av_bslot = 0; | |
249 | for (slot = 0; slot < ATH_BCBUF; slot++) | |
2c3db3d5 | 250 | if (sc->beacon.bslot[slot] == NULL) { |
f078f209 | 251 | avp->av_bslot = slot; |
014cf3bb | 252 | avp->is_bslot_active = false; |
774610e4 | 253 | |
f078f209 | 254 | /* NB: keep looking for a double slot */ |
774610e4 FF |
255 | if (slot == 0 || !sc->beacon.bslot[slot-1]) |
256 | break; | |
f078f209 | 257 | } |
2c3db3d5 JM |
258 | BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL); |
259 | sc->beacon.bslot[avp->av_bslot] = vif; | |
17d7904d | 260 | sc->nbcnvifs++; |
f078f209 LR |
261 | } |
262 | } | |
263 | ||
9fc9ab0a | 264 | /* release the previous beacon frame, if it already exists. */ |
f078f209 LR |
265 | bf = avp->av_bcbuf; |
266 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 267 | skb = bf->bf_mpdu; |
c1739eb3 | 268 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 269 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
270 | dev_kfree_skb_any(skb); |
271 | bf->bf_mpdu = NULL; | |
6cf9e995 | 272 | bf->bf_buf_addr = 0; |
f078f209 LR |
273 | } |
274 | ||
9fc9ab0a | 275 | /* NB: the beacon data buffer must be 32-bit aligned. */ |
5640b08e | 276 | skb = ieee80211_beacon_get(sc->hw, vif); |
d7e86c32 | 277 | if (skb == NULL) |
f078f209 | 278 | return -ENOMEM; |
f078f209 | 279 | |
459f5f90 | 280 | tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; |
dd347f2f | 281 | sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp); |
4ed96f04 | 282 | /* Calculate a TSF adjustment factor required for staggered beacons. */ |
f078f209 LR |
283 | if (avp->av_bslot > 0) { |
284 | u64 tsfadjust; | |
f078f209 LR |
285 | int intval; |
286 | ||
9814f6b3 | 287 | intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; |
f078f209 LR |
288 | |
289 | /* | |
4ed96f04 JM |
290 | * Calculate the TSF offset for this beacon slot, i.e., the |
291 | * number of usecs that need to be added to the timestamp field | |
292 | * in Beacon and Probe Response frames. Beacon slot 0 is | |
293 | * processed at the correct offset, so it does not require TSF | |
294 | * adjustment. Other slots are adjusted to get the timestamp | |
295 | * close to the TBTT for the BSS. | |
f078f209 | 296 | */ |
dd347f2f FF |
297 | tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF; |
298 | avp->tsf_adjust = cpu_to_le64(tsfadjust); | |
f078f209 | 299 | |
226afe68 JP |
300 | ath_dbg(common, ATH_DBG_BEACON, |
301 | "stagger beacons, bslot %d intval %u tsfadjust %llu\n", | |
302 | avp->av_bslot, intval, (unsigned long long)tsfadjust); | |
f078f209 | 303 | |
4ed96f04 JM |
304 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
305 | avp->tsf_adjust; | |
306 | } else | |
307 | avp->tsf_adjust = cpu_to_le64(0); | |
f078f209 | 308 | |
f8316df1 | 309 | bf->bf_mpdu = skb; |
c1739eb3 BG |
310 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
311 | skb->len, DMA_TO_DEVICE); | |
7da3c55c | 312 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
313 | dev_kfree_skb_any(skb); |
314 | bf->bf_mpdu = NULL; | |
6cf9e995 | 315 | bf->bf_buf_addr = 0; |
3800276a | 316 | ath_err(common, "dma_mapping_error on beacon alloc\n"); |
f8316df1 LR |
317 | return -ENOMEM; |
318 | } | |
014cf3bb | 319 | avp->is_bslot_active = true; |
f078f209 LR |
320 | |
321 | return 0; | |
322 | } | |
323 | ||
17d7904d | 324 | void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp) |
f078f209 LR |
325 | { |
326 | if (avp->av_bcbuf != NULL) { | |
327 | struct ath_buf *bf; | |
328 | ||
f60c49b6 | 329 | avp->is_bslot_active = false; |
f078f209 | 330 | if (avp->av_bslot != -1) { |
2c3db3d5 | 331 | sc->beacon.bslot[avp->av_bslot] = NULL; |
17d7904d | 332 | sc->nbcnvifs--; |
66da4241 | 333 | avp->av_bslot = -1; |
f078f209 LR |
334 | } |
335 | ||
336 | bf = avp->av_bcbuf; | |
337 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 338 | struct sk_buff *skb = bf->bf_mpdu; |
c1739eb3 | 339 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 340 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
341 | dev_kfree_skb_any(skb); |
342 | bf->bf_mpdu = NULL; | |
6cf9e995 | 343 | bf->bf_buf_addr = 0; |
f078f209 | 344 | } |
b77f483f | 345 | list_add_tail(&bf->list, &sc->beacon.bbuf); |
f078f209 LR |
346 | |
347 | avp->av_bcbuf = NULL; | |
348 | } | |
349 | } | |
350 | ||
9fc9ab0a | 351 | void ath_beacon_tasklet(unsigned long data) |
f078f209 | 352 | { |
f078f209 | 353 | struct ath_softc *sc = (struct ath_softc *)data; |
9814f6b3 | 354 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
cbe61d8a | 355 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 356 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 357 | struct ath_buf *bf = NULL; |
2c3db3d5 | 358 | struct ieee80211_vif *vif; |
dcfcbd59 | 359 | struct ath_tx_status ts; |
2c3db3d5 | 360 | int slot; |
c6820f1e | 361 | u32 bfaddr, bc = 0; |
f078f209 | 362 | |
f078f209 LR |
363 | /* |
364 | * Check if the previous beacon has gone out. If | |
365 | * not don't try to post another, skip this period | |
366 | * and wait for the next. Missed beacons indicate | |
367 | * a problem and should not occur. If we miss too | |
368 | * many consecutive beacons reset the device. | |
369 | */ | |
b77f483f S |
370 | if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { |
371 | sc->beacon.bmisscnt++; | |
9546aae0 | 372 | |
c944daf4 | 373 | if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { |
226afe68 JP |
374 | ath_dbg(common, ATH_DBG_BSTUCK, |
375 | "missed %u consecutive beacons\n", | |
376 | sc->beacon.bmisscnt); | |
efff395e | 377 | ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); |
87c510fe FF |
378 | if (sc->beacon.bmisscnt > 3) |
379 | ath9k_hw_bstuck_nfcal(ah); | |
b77f483f | 380 | } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { |
226afe68 JP |
381 | ath_dbg(common, ATH_DBG_BSTUCK, |
382 | "beacon is officially stuck\n"); | |
b74444f8 | 383 | sc->sc_flags |= SC_OP_TSF_RESET; |
236de514 | 384 | ieee80211_queue_work(sc->hw, &sc->hw_reset_work); |
f078f209 | 385 | } |
9546aae0 | 386 | |
f078f209 LR |
387 | return; |
388 | } | |
980b24da | 389 | |
f078f209 LR |
390 | /* |
391 | * Generate beacon frames. we are sending frames | |
392 | * staggered so calculate the slot for this frame based | |
393 | * on the tsf to safeguard against missing an swba. | |
394 | */ | |
395 | ||
f078f209 | 396 | |
c6820f1e FF |
397 | if (ah->opmode == NL80211_IFTYPE_AP) { |
398 | u16 intval; | |
399 | u32 tsftu; | |
400 | u64 tsf; | |
401 | ||
402 | intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; | |
403 | tsf = ath9k_hw_gettsf64(ah); | |
404 | tsf += TU_TO_USEC(ah->config.sw_beacon_response_time); | |
405 | tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); | |
406 | slot = (tsftu % (intval * ATH_BCBUF)) / intval; | |
407 | vif = sc->beacon.bslot[slot]; | |
408 | ||
409 | ath_dbg(common, ATH_DBG_BEACON, | |
410 | "slot %d [tsf %llu tsftu %u intval %u] vif %p\n", | |
411 | slot, tsf, tsftu / ATH_BCBUF, intval, vif); | |
412 | } else { | |
413 | slot = 0; | |
414 | vif = sc->beacon.bslot[slot]; | |
415 | } | |
980b24da | 416 | |
980b24da | 417 | |
f078f209 | 418 | bfaddr = 0; |
2c3db3d5 | 419 | if (vif) { |
7545daf4 | 420 | bf = ath_beacon_generate(sc->hw, vif); |
f078f209 LR |
421 | if (bf != NULL) { |
422 | bfaddr = bf->bf_daddr; | |
423 | bc = 1; | |
424 | } | |
c944daf4 FF |
425 | |
426 | if (sc->beacon.bmisscnt != 0) { | |
427 | ath_dbg(common, ATH_DBG_BSTUCK, | |
428 | "resume beacon xmit after %u misses\n", | |
429 | sc->beacon.bmisscnt); | |
430 | sc->beacon.bmisscnt = 0; | |
431 | } | |
f078f209 | 432 | } |
9546aae0 | 433 | |
f078f209 LR |
434 | /* |
435 | * Handle slot time change when a non-ERP station joins/leaves | |
436 | * an 11g network. The 802.11 layer notifies us via callback, | |
437 | * we mark updateslot, then wait one beacon before effecting | |
438 | * the change. This gives associated stations at least one | |
439 | * beacon interval to note the state change. | |
440 | * | |
441 | * NB: The slot time change state machine is clocked according | |
442 | * to whether we are bursting or staggering beacons. We | |
443 | * recognize the request to update and record the current | |
444 | * slot then don't transition until that slot is reached | |
445 | * again. If we miss a beacon for that slot then we'll be | |
446 | * slow to transition but we'll be sure at least one beacon | |
447 | * interval has passed. When bursting slot is always left | |
448 | * set to ATH_BCBUF so this check is a noop. | |
449 | */ | |
b77f483f S |
450 | if (sc->beacon.updateslot == UPDATE) { |
451 | sc->beacon.updateslot = COMMIT; /* commit next beacon */ | |
452 | sc->beacon.slotupdate = slot; | |
453 | } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) { | |
0005baf4 FF |
454 | ah->slottime = sc->beacon.slottime; |
455 | ath9k_hw_init_global_settings(ah); | |
b77f483f | 456 | sc->beacon.updateslot = OK; |
ff37e337 | 457 | } |
f078f209 | 458 | if (bfaddr != 0) { |
f078f209 | 459 | /* NB: cabq traffic should already be queued and primed */ |
b77f483f S |
460 | ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr); |
461 | ath9k_hw_txstart(ah, sc->beacon.beaconq); | |
f078f209 | 462 | |
17d7904d | 463 | sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ |
dcfcbd59 RM |
464 | if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) { |
465 | spin_lock_bh(&sc->sc_pcu_lock); | |
466 | ath9k_hw_txprocdesc(ah, bf->bf_desc, (void *)&ts); | |
467 | spin_unlock_bh(&sc->sc_pcu_lock); | |
468 | } | |
f078f209 | 469 | } |
f078f209 LR |
470 | } |
471 | ||
21526d57 LR |
472 | static void ath9k_beacon_init(struct ath_softc *sc, |
473 | u32 next_beacon, | |
474 | u32 beacon_period) | |
475 | { | |
dd347f2f | 476 | if (sc->sc_flags & SC_OP_TSF_RESET) { |
21526d57 | 477 | ath9k_ps_wakeup(sc); |
dd347f2f FF |
478 | ath9k_hw_reset_tsf(sc->sc_ah); |
479 | } | |
21526d57 LR |
480 | |
481 | ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period); | |
482 | ||
dd347f2f | 483 | if (sc->sc_flags & SC_OP_TSF_RESET) { |
21526d57 | 484 | ath9k_ps_restore(sc); |
dd347f2f FF |
485 | sc->sc_flags &= ~SC_OP_TSF_RESET; |
486 | } | |
21526d57 LR |
487 | } |
488 | ||
f078f209 | 489 | /* |
5379c8a2 S |
490 | * For multi-bss ap support beacons are either staggered evenly over N slots or |
491 | * burst together. For the former arrange for the SWBA to be delivered for each | |
492 | * slot. Slots that are not occupied will generate nothing. | |
f078f209 | 493 | */ |
5379c8a2 | 494 | static void ath_beacon_config_ap(struct ath_softc *sc, |
d31e20af | 495 | struct ath_beacon_config *conf) |
f078f209 | 496 | { |
3069168c | 497 | struct ath_hw *ah = sc->sc_ah; |
980b24da | 498 | u32 nexttbtt, intval; |
f078f209 | 499 | |
5379c8a2 | 500 | /* NB: the beacon interval is kept internally in TU's */ |
f29f5c08 | 501 | intval = TU_TO_USEC(conf->beacon_interval); |
5379c8a2 S |
502 | intval /= ATH_BCBUF; /* for staggered beacons */ |
503 | nexttbtt = intval; | |
d8728ee9 | 504 | |
5379c8a2 S |
505 | /* |
506 | * In AP mode we enable the beacon timers and SWBA interrupts to | |
507 | * prepare beacon frames. | |
508 | */ | |
3069168c | 509 | ah->imask |= ATH9K_INT_SWBA; |
5379c8a2 | 510 | ath_beaconq_config(sc); |
f078f209 | 511 | |
5379c8a2 | 512 | /* Set the computed AP beacon timers */ |
f078f209 | 513 | |
4df3071e | 514 | ath9k_hw_disable_interrupts(ah); |
c31c8261 | 515 | sc->sc_flags |= SC_OP_TSF_RESET; |
21526d57 | 516 | ath9k_beacon_init(sc, nexttbtt, intval); |
5379c8a2 | 517 | sc->beacon.bmisscnt = 0; |
3069168c | 518 | ath9k_hw_set_interrupts(ah, ah->imask); |
b037b693 | 519 | ath9k_hw_enable_interrupts(ah); |
5379c8a2 | 520 | } |
459f5f90 | 521 | |
5379c8a2 S |
522 | /* |
523 | * This sets up the beacon timers according to the timestamp of the last | |
524 | * received beacon and the current TSF, configures PCF and DTIM | |
525 | * handling, programs the sleep registers so the hardware will wakeup in | |
526 | * time to receive beacons, and configures the beacon miss handling so | |
527 | * we'll receive a BMISS interrupt when we stop seeing beacons from the AP | |
528 | * we've associated with. | |
529 | */ | |
530 | static void ath_beacon_config_sta(struct ath_softc *sc, | |
d31e20af | 531 | struct ath_beacon_config *conf) |
5379c8a2 | 532 | { |
3069168c PR |
533 | struct ath_hw *ah = sc->sc_ah; |
534 | struct ath_common *common = ath9k_hw_common(ah); | |
5379c8a2 S |
535 | struct ath9k_beacon_state bs; |
536 | int dtimperiod, dtimcount, sleepduration; | |
537 | int cfpperiod, cfpcount; | |
538 | u32 nexttbtt = 0, intval, tsftu; | |
539 | u64 tsf; | |
267a9012 | 540 | int num_beacons, offset, dtim_dec_count, cfp_dec_count; |
5379c8a2 | 541 | |
1a20034a SB |
542 | /* No need to configure beacon if we are not associated */ |
543 | if (!common->curaid) { | |
226afe68 JP |
544 | ath_dbg(common, ATH_DBG_BEACON, |
545 | "STA is not yet associated..skipping beacon config\n"); | |
1a20034a SB |
546 | return; |
547 | } | |
548 | ||
5379c8a2 | 549 | memset(&bs, 0, sizeof(bs)); |
f29f5c08 | 550 | intval = conf->beacon_interval; |
5379c8a2 S |
551 | |
552 | /* | |
553 | * Setup dtim and cfp parameters according to | |
554 | * last beacon we received (which may be none). | |
555 | */ | |
556 | dtimperiod = conf->dtim_period; | |
5379c8a2 S |
557 | dtimcount = conf->dtim_count; |
558 | if (dtimcount >= dtimperiod) /* NB: sanity check */ | |
559 | dtimcount = 0; | |
560 | cfpperiod = 1; /* NB: no PCF support yet */ | |
561 | cfpcount = 0; | |
562 | ||
563 | sleepduration = conf->listen_interval * intval; | |
5379c8a2 S |
564 | |
565 | /* | |
566 | * Pull nexttbtt forward to reflect the current | |
567 | * TSF and calculate dtim+cfp state for the result. | |
568 | */ | |
3069168c | 569 | tsf = ath9k_hw_gettsf64(ah); |
5379c8a2 | 570 | tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; |
267a9012 JM |
571 | |
572 | num_beacons = tsftu / intval + 1; | |
573 | offset = tsftu % intval; | |
574 | nexttbtt = tsftu - offset; | |
575 | if (offset) | |
5379c8a2 | 576 | nexttbtt += intval; |
267a9012 JM |
577 | |
578 | /* DTIM Beacon every dtimperiod Beacon */ | |
579 | dtim_dec_count = num_beacons % dtimperiod; | |
580 | /* CFP every cfpperiod DTIM Beacon */ | |
581 | cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; | |
582 | if (dtim_dec_count) | |
583 | cfp_dec_count++; | |
584 | ||
585 | dtimcount -= dtim_dec_count; | |
586 | if (dtimcount < 0) | |
587 | dtimcount += dtimperiod; | |
588 | ||
589 | cfpcount -= cfp_dec_count; | |
590 | if (cfpcount < 0) | |
591 | cfpcount += cfpperiod; | |
5379c8a2 S |
592 | |
593 | bs.bs_intval = intval; | |
594 | bs.bs_nexttbtt = nexttbtt; | |
595 | bs.bs_dtimperiod = dtimperiod*intval; | |
596 | bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; | |
597 | bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; | |
598 | bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; | |
599 | bs.bs_cfpmaxduration = 0; | |
600 | ||
601 | /* | |
602 | * Calculate the number of consecutive beacons to miss* before taking | |
603 | * a BMISS interrupt. The configuration is specified in TU so we only | |
604 | * need calculate based on the beacon interval. Note that we clamp the | |
605 | * result to at most 15 beacons. | |
606 | */ | |
607 | if (sleepduration > intval) { | |
608 | bs.bs_bmissthreshold = conf->listen_interval * | |
609 | ATH_DEFAULT_BMISS_LIMIT / 2; | |
f078f209 | 610 | } else { |
5379c8a2 S |
611 | bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); |
612 | if (bs.bs_bmissthreshold > 15) | |
613 | bs.bs_bmissthreshold = 15; | |
614 | else if (bs.bs_bmissthreshold <= 0) | |
615 | bs.bs_bmissthreshold = 1; | |
f078f209 LR |
616 | } |
617 | ||
5379c8a2 S |
618 | /* |
619 | * Calculate sleep duration. The configuration is given in ms. | |
620 | * We ensure a multiple of the beacon period is used. Also, if the sleep | |
621 | * duration is greater than the DTIM period then it makes senses | |
622 | * to make it a multiple of that. | |
623 | * | |
624 | * XXX fixed at 100ms | |
625 | */ | |
980b24da | 626 | |
5379c8a2 S |
627 | bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); |
628 | if (bs.bs_sleepduration > bs.bs_dtimperiod) | |
629 | bs.bs_sleepduration = bs.bs_dtimperiod; | |
980b24da | 630 | |
5379c8a2 S |
631 | /* TSF out of range threshold fixed at 1 second */ |
632 | bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; | |
f078f209 | 633 | |
226afe68 JP |
634 | ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); |
635 | ath_dbg(common, ATH_DBG_BEACON, | |
636 | "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", | |
637 | bs.bs_bmissthreshold, bs.bs_sleepduration, | |
638 | bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); | |
f078f209 | 639 | |
5379c8a2 | 640 | /* Set the computed STA beacon timers */ |
980b24da | 641 | |
4df3071e | 642 | ath9k_hw_disable_interrupts(ah); |
3069168c PR |
643 | ath9k_hw_set_sta_beacon_timers(ah, &bs); |
644 | ah->imask |= ATH9K_INT_BMISS; | |
deb75188 | 645 | |
e8fe7336 RM |
646 | ath9k_hw_set_interrupts(ah, ah->imask); |
647 | ath9k_hw_enable_interrupts(ah); | |
5379c8a2 | 648 | } |
f078f209 | 649 | |
5379c8a2 | 650 | static void ath_beacon_config_adhoc(struct ath_softc *sc, |
ee832d3e | 651 | struct ath_beacon_config *conf) |
5379c8a2 | 652 | { |
3069168c PR |
653 | struct ath_hw *ah = sc->sc_ah; |
654 | struct ath_common *common = ath9k_hw_common(ah); | |
81168e50 | 655 | u32 tsf, intval, nexttbtt; |
dd347f2f | 656 | |
ba4903f9 FF |
657 | ath9k_reset_beacon_status(sc); |
658 | ||
f29f5c08 | 659 | intval = TU_TO_USEC(conf->beacon_interval); |
81168e50 FD |
660 | tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval); |
661 | nexttbtt = tsf + intval; | |
f078f209 | 662 | |
226afe68 JP |
663 | ath_dbg(common, ATH_DBG_BEACON, |
664 | "IBSS nexttbtt %u intval %u (%u)\n", | |
665 | nexttbtt, intval, conf->beacon_interval); | |
9fc9ab0a | 666 | |
5379c8a2 S |
667 | /* |
668 | * In IBSS mode enable the beacon timers but only enable SWBA interrupts | |
669 | * if we need to manually prepare beacon frames. Otherwise we use a | |
670 | * self-linked tx descriptor and let the hardware deal with things. | |
671 | */ | |
a65e4cb4 | 672 | ah->imask |= ATH9K_INT_SWBA; |
9fc9ab0a | 673 | |
5379c8a2 S |
674 | ath_beaconq_config(sc); |
675 | ||
676 | /* Set the computed ADHOC beacon timers */ | |
677 | ||
4df3071e | 678 | ath9k_hw_disable_interrupts(ah); |
21526d57 | 679 | ath9k_beacon_init(sc, nexttbtt, intval); |
5379c8a2 | 680 | sc->beacon.bmisscnt = 0; |
e8fe7336 RM |
681 | |
682 | ath9k_hw_set_interrupts(ah, ah->imask); | |
683 | ath9k_hw_enable_interrupts(ah); | |
f078f209 LR |
684 | } |
685 | ||
99e4d43a RM |
686 | static bool ath9k_allow_beacon_config(struct ath_softc *sc, |
687 | struct ieee80211_vif *vif) | |
f078f209 | 688 | { |
6b96f93e | 689 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
c46917bb | 690 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
99e4d43a RM |
691 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; |
692 | struct ath_vif *avp = (void *)vif->drv_priv; | |
5379c8a2 | 693 | |
99e4d43a RM |
694 | /* |
695 | * Can not have different beacon interval on multiple | |
696 | * AP interface case | |
697 | */ | |
698 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) && | |
699 | (sc->nbcnvifs > 1) && | |
700 | (vif->type == NL80211_IFTYPE_AP) && | |
701 | (cur_conf->beacon_interval != bss_conf->beacon_int)) { | |
702 | ath_dbg(common, ATH_DBG_CONFIG, | |
703 | "Changing beacon interval of multiple \ | |
704 | AP interfaces !\n"); | |
705 | return false; | |
706 | } | |
707 | /* | |
708 | * Can not configure station vif's beacon config | |
709 | * while on AP opmode | |
710 | */ | |
711 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) && | |
712 | (vif->type != NL80211_IFTYPE_AP)) { | |
713 | ath_dbg(common, ATH_DBG_CONFIG, | |
714 | "STA vif's beacon not allowed on AP mode\n"); | |
715 | return false; | |
716 | } | |
717 | /* | |
718 | * Do not allow beacon config if HW was already configured | |
719 | * with another STA vif | |
720 | */ | |
721 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) && | |
722 | (vif->type == NL80211_IFTYPE_STATION) && | |
723 | (sc->sc_flags & SC_OP_BEACONS) && | |
724 | !avp->primary_sta_vif) { | |
725 | ath_dbg(common, ATH_DBG_CONFIG, | |
726 | "Beacon already configured for a station interface\n"); | |
727 | return false; | |
ee832d3e | 728 | } |
99e4d43a RM |
729 | return true; |
730 | } | |
731 | ||
732 | void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) | |
733 | { | |
734 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
735 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; | |
ee832d3e | 736 | |
99e4d43a RM |
737 | if (!ath9k_allow_beacon_config(sc, vif)) |
738 | return; | |
739 | ||
740 | /* Setup the beacon configuration parameters */ | |
741 | cur_conf->beacon_interval = bss_conf->beacon_int; | |
742 | cur_conf->dtim_period = bss_conf->dtim_period; | |
4801416c BG |
743 | cur_conf->listen_interval = 1; |
744 | cur_conf->dtim_count = 1; | |
745 | cur_conf->bmiss_timeout = | |
746 | ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; | |
6b96f93e | 747 | |
c4f9f16b VT |
748 | /* |
749 | * It looks like mac80211 may end up using beacon interval of zero in | |
750 | * some cases (at least for mesh point). Avoid getting into an | |
751 | * infinite loop by using a bit safer value instead. To be safe, | |
752 | * do sanity check on beacon interval for all operating modes. | |
753 | */ | |
754 | if (cur_conf->beacon_interval == 0) | |
755 | cur_conf->beacon_interval = 100; | |
6b96f93e | 756 | |
ee832d3e | 757 | /* |
3a2329f2 MSS |
758 | * We don't parse dtim period from mac80211 during the driver |
759 | * initialization as it breaks association with hidden-ssid | |
760 | * AP and it causes latency in roaming | |
ee832d3e MSS |
761 | */ |
762 | if (cur_conf->dtim_period == 0) | |
763 | cur_conf->dtim_period = 1; | |
764 | ||
99e4d43a | 765 | ath_set_beacon(sc); |
99e4d43a RM |
766 | } |
767 | ||
8e22ad32 RM |
768 | static bool ath_has_valid_bslot(struct ath_softc *sc) |
769 | { | |
770 | struct ath_vif *avp; | |
771 | int slot; | |
772 | bool found = false; | |
773 | ||
774 | for (slot = 0; slot < ATH_BCBUF; slot++) { | |
775 | if (sc->beacon.bslot[slot]) { | |
776 | avp = (void *)sc->beacon.bslot[slot]->drv_priv; | |
777 | if (avp->is_bslot_active) { | |
778 | found = true; | |
779 | break; | |
780 | } | |
781 | } | |
782 | } | |
783 | return found; | |
784 | } | |
785 | ||
786 | ||
99e4d43a RM |
787 | void ath_set_beacon(struct ath_softc *sc) |
788 | { | |
789 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); | |
790 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
791 | ||
26cd322b | 792 | switch (sc->sc_ah->opmode) { |
6b96f93e | 793 | case NL80211_IFTYPE_AP: |
8e22ad32 RM |
794 | if (ath_has_valid_bslot(sc)) |
795 | ath_beacon_config_ap(sc, cur_conf); | |
6b96f93e VT |
796 | break; |
797 | case NL80211_IFTYPE_ADHOC: | |
798 | case NL80211_IFTYPE_MESH_POINT: | |
ee832d3e | 799 | ath_beacon_config_adhoc(sc, cur_conf); |
6b96f93e VT |
800 | break; |
801 | case NL80211_IFTYPE_STATION: | |
802 | ath_beacon_config_sta(sc, cur_conf); | |
803 | break; | |
804 | default: | |
226afe68 JP |
805 | ath_dbg(common, ATH_DBG_CONFIG, |
806 | "Unsupported beaconing mode\n"); | |
6b96f93e VT |
807 | return; |
808 | } | |
809 | ||
810 | sc->sc_flags |= SC_OP_BEACONS; | |
f078f209 | 811 | } |
014cf3bb RM |
812 | |
813 | void ath9k_set_beaconing_status(struct ath_softc *sc, bool status) | |
814 | { | |
815 | struct ath_hw *ah = sc->sc_ah; | |
014cf3bb | 816 | |
8e22ad32 | 817 | if (!ath_has_valid_bslot(sc)) |
99e4d43a RM |
818 | return; |
819 | ||
820 | ath9k_ps_wakeup(sc); | |
821 | if (status) { | |
822 | /* Re-enable beaconing */ | |
823 | ah->imask |= ATH9K_INT_SWBA; | |
824 | ath9k_hw_set_interrupts(ah, ah->imask); | |
014cf3bb RM |
825 | } else { |
826 | /* Disable SWBA interrupt */ | |
827 | ah->imask &= ~ATH9K_INT_SWBA; | |
828 | ath9k_hw_set_interrupts(ah, ah->imask); | |
829 | tasklet_kill(&sc->bcon_tasklet); | |
efff395e | 830 | ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); |
014cf3bb RM |
831 | } |
832 | ath9k_ps_restore(sc); | |
833 | } |