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 | ||
394cf0a1 | 17 | #include "ath9k.h" |
f078f209 | 18 | |
5379c8a2 S |
19 | #define FUDGE 2 |
20 | ||
ba4903f9 FF |
21 | static void ath9k_reset_beacon_status(struct ath_softc *sc) |
22 | { | |
23 | sc->beacon.tx_processed = false; | |
24 | sc->beacon.tx_last = false; | |
25 | } | |
26 | ||
f078f209 | 27 | /* |
f078f209 LR |
28 | * This function will modify certain transmit queue properties depending on |
29 | * the operating mode of the station (AP or AdHoc). Parameters are AIFS | |
30 | * settings and channel width min/max | |
31 | */ | |
94db2936 | 32 | int ath_beaconq_config(struct ath_softc *sc) |
f078f209 | 33 | { |
cbe61d8a | 34 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 35 | struct ath_common *common = ath9k_hw_common(ah); |
94db2936 | 36 | struct ath9k_tx_queue_info qi, qi_be; |
066dae93 | 37 | struct ath_txq *txq; |
f078f209 | 38 | |
b77f483f | 39 | ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi); |
2660b81a | 40 | if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { |
f078f209 LR |
41 | /* Always burst out beacon and CAB traffic. */ |
42 | qi.tqi_aifs = 1; | |
43 | qi.tqi_cwmin = 0; | |
44 | qi.tqi_cwmax = 0; | |
45 | } else { | |
46 | /* Adhoc mode; important thing is to use 2x cwmin. */ | |
066dae93 FF |
47 | txq = sc->tx.txq_map[WME_AC_BE]; |
48 | ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be); | |
94db2936 VN |
49 | qi.tqi_aifs = qi_be.tqi_aifs; |
50 | qi.tqi_cwmin = 4*qi_be.tqi_cwmin; | |
51 | qi.tqi_cwmax = qi_be.tqi_cwmax; | |
f078f209 LR |
52 | } |
53 | ||
b77f483f | 54 | if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { |
3800276a JP |
55 | ath_err(common, |
56 | "Unable to update h/w beacon queue parameters\n"); | |
f078f209 LR |
57 | return 0; |
58 | } else { | |
9fc9ab0a | 59 | ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); |
f078f209 LR |
60 | return 1; |
61 | } | |
62 | } | |
63 | ||
64 | /* | |
f078f209 | 65 | * Associates the beacon frame buffer with a transmit descriptor. Will set |
dd347f2f FF |
66 | * up rate codes, and channel flags. Beacons are always sent out at the |
67 | * lowest rate, and are not retried. | |
f078f209 | 68 | */ |
9fc9ab0a | 69 | static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp, |
64b84010 | 70 | struct ath_buf *bf, int rateidx) |
f078f209 | 71 | { |
a22be22a | 72 | struct sk_buff *skb = bf->bf_mpdu; |
cbe61d8a | 73 | struct ath_hw *ah = sc->sc_ah; |
43c27613 | 74 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 75 | struct ath_desc *ds; |
980b24da | 76 | struct ath9k_11n_rate_series series[4]; |
dd347f2f | 77 | int flags, ctsrate = 0, ctsduration = 0; |
545750d3 FF |
78 | struct ieee80211_supported_band *sband; |
79 | u8 rate = 0; | |
f078f209 | 80 | |
ba4903f9 FF |
81 | ath9k_reset_beacon_status(sc); |
82 | ||
f078f209 | 83 | ds = bf->bf_desc; |
f078f209 LR |
84 | flags = ATH9K_TXDESC_NOACK; |
85 | ||
a65e4cb4 | 86 | ds->ds_link = 0; |
f078f209 | 87 | |
545750d3 | 88 | sband = &sc->sbands[common->hw->conf.channel->band]; |
64b84010 | 89 | rate = sband->bitrates[rateidx].hw_value; |
672840ac | 90 | if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) |
64b84010 | 91 | rate |= sband->bitrates[rateidx].hw_value_short; |
9fc9ab0a S |
92 | |
93 | ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN, | |
94 | ATH9K_PKT_TYPE_BEACON, | |
95 | MAX_RATE_POWER, | |
96 | ATH9K_TXKEYIX_INVALID, | |
97 | ATH9K_KEY_TYPE_CLEAR, | |
98 | flags); | |
f078f209 LR |
99 | |
100 | /* NB: beacon's BufLen must be a multiple of 4 bytes */ | |
9fc9ab0a | 101 | ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4), |
cc610ac0 VT |
102 | true, true, ds, bf->bf_buf_addr, |
103 | sc->beacon.beaconq); | |
f078f209 | 104 | |
0345f37b | 105 | memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); |
f078f209 LR |
106 | series[0].Tries = 1; |
107 | series[0].Rate = rate; | |
ea066d5a MSS |
108 | series[0].ChSel = ath_txchainmask_reduction(sc, |
109 | common->tx_chainmask, series[0].Rate); | |
f078f209 | 110 | series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0; |
9fc9ab0a S |
111 | ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration, |
112 | series, 4, 0); | |
f078f209 LR |
113 | } |
114 | ||
28d16708 FF |
115 | static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb) |
116 | { | |
9ac58615 | 117 | struct ath_softc *sc = hw->priv; |
28d16708 FF |
118 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
119 | struct ath_tx_control txctl; | |
120 | ||
121 | memset(&txctl, 0, sizeof(struct ath_tx_control)); | |
122 | txctl.txq = sc->beacon.cabq; | |
123 | ||
226afe68 JP |
124 | ath_dbg(common, ATH_DBG_XMIT, |
125 | "transmitting CABQ packet, skb: %p\n", skb); | |
28d16708 FF |
126 | |
127 | if (ath_tx_start(hw, skb, &txctl) != 0) { | |
226afe68 | 128 | ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n"); |
28d16708 FF |
129 | dev_kfree_skb_any(skb); |
130 | } | |
131 | } | |
132 | ||
c52f33d0 | 133 | static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw, |
2c3db3d5 | 134 | struct ieee80211_vif *vif) |
f078f209 | 135 | { |
9ac58615 | 136 | struct ath_softc *sc = hw->priv; |
c46917bb | 137 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
f078f209 | 138 | struct ath_buf *bf; |
17d7904d | 139 | struct ath_vif *avp; |
f078f209 | 140 | struct sk_buff *skb; |
f078f209 | 141 | struct ath_txq *cabq; |
147583c0 | 142 | struct ieee80211_tx_info *info; |
980b24da S |
143 | int cabq_depth; |
144 | ||
ba4903f9 FF |
145 | ath9k_reset_beacon_status(sc); |
146 | ||
5640b08e | 147 | avp = (void *)vif->drv_priv; |
b77f483f | 148 | cabq = sc->beacon.cabq; |
f078f209 | 149 | |
014cf3bb | 150 | if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active) |
f078f209 | 151 | return NULL; |
980b24da | 152 | |
9fc9ab0a S |
153 | /* Release the old beacon first */ |
154 | ||
f078f209 | 155 | bf = avp->av_bcbuf; |
a22be22a | 156 | skb = bf->bf_mpdu; |
a8fff50e | 157 | if (skb) { |
c1739eb3 | 158 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 159 | skb->len, DMA_TO_DEVICE); |
3fbb9d95 | 160 | dev_kfree_skb_any(skb); |
6cf9e995 | 161 | bf->bf_buf_addr = 0; |
a8fff50e | 162 | } |
f078f209 | 163 | |
9fc9ab0a S |
164 | /* Get a new beacon from mac80211 */ |
165 | ||
c52f33d0 | 166 | skb = ieee80211_beacon_get(hw, vif); |
a8fff50e JM |
167 | bf->bf_mpdu = skb; |
168 | if (skb == NULL) | |
169 | return NULL; | |
4ed96f04 JM |
170 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
171 | avp->tsf_adjust; | |
980b24da | 172 | |
147583c0 JM |
173 | info = IEEE80211_SKB_CB(skb); |
174 | if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { | |
175 | /* | |
176 | * TODO: make sure the seq# gets assigned properly (vs. other | |
177 | * TX frames) | |
178 | */ | |
980b24da | 179 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b77f483f | 180 | sc->tx.seq_no += 0x10; |
147583c0 | 181 | hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); |
b77f483f | 182 | hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); |
147583c0 | 183 | } |
980b24da | 184 | |
c1739eb3 BG |
185 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
186 | skb->len, DMA_TO_DEVICE); | |
7da3c55c | 187 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
188 | dev_kfree_skb_any(skb); |
189 | bf->bf_mpdu = NULL; | |
6cf9e995 | 190 | bf->bf_buf_addr = 0; |
3800276a | 191 | ath_err(common, "dma_mapping_error on beaconing\n"); |
f8316df1 LR |
192 | return NULL; |
193 | } | |
f078f209 | 194 | |
c52f33d0 | 195 | skb = ieee80211_get_buffered_bc(hw, vif); |
f078f209 | 196 | |
f078f209 LR |
197 | /* |
198 | * if the CABQ traffic from previous DTIM is pending and the current | |
199 | * beacon is also a DTIM. | |
17d7904d S |
200 | * 1) if there is only one vif let the cab traffic continue. |
201 | * 2) if there are more than one vif and we are using staggered | |
f078f209 | 202 | * beacons, then drain the cabq by dropping all the frames in |
17d7904d | 203 | * the cabq so that the current vifs cab traffic can be scheduled. |
f078f209 LR |
204 | */ |
205 | spin_lock_bh(&cabq->axq_lock); | |
206 | cabq_depth = cabq->axq_depth; | |
207 | spin_unlock_bh(&cabq->axq_lock); | |
208 | ||
e022edbd | 209 | if (skb && cabq_depth) { |
17d7904d | 210 | if (sc->nvifs > 1) { |
226afe68 JP |
211 | ath_dbg(common, ATH_DBG_BEACON, |
212 | "Flushing previous cabq traffic\n"); | |
9fc9ab0a | 213 | ath_draintxq(sc, cabq, false); |
f078f209 LR |
214 | } |
215 | } | |
216 | ||
64b84010 | 217 | ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx); |
f078f209 | 218 | |
e022edbd | 219 | while (skb) { |
c52f33d0 JM |
220 | ath_tx_cabq(hw, skb); |
221 | skb = ieee80211_get_buffered_bc(hw, vif); | |
e022edbd | 222 | } |
f078f209 | 223 | |
f078f209 LR |
224 | return bf; |
225 | } | |
226 | ||
9ac58615 | 227 | int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif) |
f078f209 | 228 | { |
c46917bb | 229 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
17d7904d | 230 | struct ath_vif *avp; |
f078f209 LR |
231 | struct ath_buf *bf; |
232 | struct sk_buff *skb; | |
9814f6b3 | 233 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
459f5f90 | 234 | __le64 tstamp; |
f078f209 | 235 | |
5640b08e | 236 | avp = (void *)vif->drv_priv; |
f078f209 LR |
237 | |
238 | /* Allocate a beacon descriptor if we haven't done so. */ | |
239 | if (!avp->av_bcbuf) { | |
980b24da S |
240 | /* Allocate beacon state for hostap/ibss. We know |
241 | * a buffer is available. */ | |
b77f483f | 242 | avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, |
980b24da | 243 | struct ath_buf, list); |
f078f209 LR |
244 | list_del(&avp->av_bcbuf->list); |
245 | ||
4801416c | 246 | if (ath9k_uses_beacons(vif->type)) { |
f078f209 LR |
247 | int slot; |
248 | /* | |
17d7904d | 249 | * Assign the vif to a beacon xmit slot. As |
f078f209 LR |
250 | * above, this cannot fail to find one. |
251 | */ | |
252 | avp->av_bslot = 0; | |
253 | for (slot = 0; slot < ATH_BCBUF; slot++) | |
2c3db3d5 | 254 | if (sc->beacon.bslot[slot] == NULL) { |
f078f209 | 255 | avp->av_bslot = slot; |
014cf3bb | 256 | avp->is_bslot_active = false; |
774610e4 | 257 | |
f078f209 | 258 | /* NB: keep looking for a double slot */ |
774610e4 FF |
259 | if (slot == 0 || !sc->beacon.bslot[slot-1]) |
260 | break; | |
f078f209 | 261 | } |
2c3db3d5 JM |
262 | BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL); |
263 | sc->beacon.bslot[avp->av_bslot] = vif; | |
17d7904d | 264 | sc->nbcnvifs++; |
f078f209 LR |
265 | } |
266 | } | |
267 | ||
9fc9ab0a | 268 | /* release the previous beacon frame, if it already exists. */ |
f078f209 LR |
269 | bf = avp->av_bcbuf; |
270 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 271 | skb = bf->bf_mpdu; |
c1739eb3 | 272 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 273 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
274 | dev_kfree_skb_any(skb); |
275 | bf->bf_mpdu = NULL; | |
6cf9e995 | 276 | bf->bf_buf_addr = 0; |
f078f209 LR |
277 | } |
278 | ||
9fc9ab0a | 279 | /* NB: the beacon data buffer must be 32-bit aligned. */ |
5640b08e | 280 | skb = ieee80211_beacon_get(sc->hw, vif); |
d7e86c32 | 281 | if (skb == NULL) |
f078f209 | 282 | return -ENOMEM; |
f078f209 | 283 | |
459f5f90 | 284 | tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; |
dd347f2f | 285 | sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp); |
4ed96f04 | 286 | /* Calculate a TSF adjustment factor required for staggered beacons. */ |
f078f209 LR |
287 | if (avp->av_bslot > 0) { |
288 | u64 tsfadjust; | |
f078f209 LR |
289 | int intval; |
290 | ||
9814f6b3 | 291 | intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; |
f078f209 LR |
292 | |
293 | /* | |
4ed96f04 JM |
294 | * Calculate the TSF offset for this beacon slot, i.e., the |
295 | * number of usecs that need to be added to the timestamp field | |
296 | * in Beacon and Probe Response frames. Beacon slot 0 is | |
297 | * processed at the correct offset, so it does not require TSF | |
298 | * adjustment. Other slots are adjusted to get the timestamp | |
299 | * close to the TBTT for the BSS. | |
f078f209 | 300 | */ |
dd347f2f FF |
301 | tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF; |
302 | avp->tsf_adjust = cpu_to_le64(tsfadjust); | |
f078f209 | 303 | |
226afe68 JP |
304 | ath_dbg(common, ATH_DBG_BEACON, |
305 | "stagger beacons, bslot %d intval %u tsfadjust %llu\n", | |
306 | avp->av_bslot, intval, (unsigned long long)tsfadjust); | |
f078f209 | 307 | |
4ed96f04 JM |
308 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
309 | avp->tsf_adjust; | |
310 | } else | |
311 | avp->tsf_adjust = cpu_to_le64(0); | |
f078f209 | 312 | |
f8316df1 | 313 | bf->bf_mpdu = skb; |
c1739eb3 BG |
314 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
315 | skb->len, DMA_TO_DEVICE); | |
7da3c55c | 316 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
317 | dev_kfree_skb_any(skb); |
318 | bf->bf_mpdu = NULL; | |
6cf9e995 | 319 | bf->bf_buf_addr = 0; |
3800276a | 320 | ath_err(common, "dma_mapping_error on beacon alloc\n"); |
f8316df1 LR |
321 | return -ENOMEM; |
322 | } | |
014cf3bb | 323 | avp->is_bslot_active = true; |
f078f209 LR |
324 | |
325 | return 0; | |
326 | } | |
327 | ||
17d7904d | 328 | void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp) |
f078f209 LR |
329 | { |
330 | if (avp->av_bcbuf != NULL) { | |
331 | struct ath_buf *bf; | |
332 | ||
f60c49b6 | 333 | avp->is_bslot_active = false; |
f078f209 | 334 | if (avp->av_bslot != -1) { |
2c3db3d5 | 335 | sc->beacon.bslot[avp->av_bslot] = NULL; |
17d7904d | 336 | sc->nbcnvifs--; |
66da4241 | 337 | avp->av_bslot = -1; |
f078f209 LR |
338 | } |
339 | ||
340 | bf = avp->av_bcbuf; | |
341 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 342 | struct sk_buff *skb = bf->bf_mpdu; |
c1739eb3 | 343 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 344 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
345 | dev_kfree_skb_any(skb); |
346 | bf->bf_mpdu = NULL; | |
6cf9e995 | 347 | bf->bf_buf_addr = 0; |
f078f209 | 348 | } |
b77f483f | 349 | list_add_tail(&bf->list, &sc->beacon.bbuf); |
f078f209 LR |
350 | |
351 | avp->av_bcbuf = NULL; | |
352 | } | |
353 | } | |
354 | ||
9fc9ab0a | 355 | void ath_beacon_tasklet(unsigned long data) |
f078f209 | 356 | { |
f078f209 | 357 | struct ath_softc *sc = (struct ath_softc *)data; |
9814f6b3 | 358 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
cbe61d8a | 359 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 360 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 361 | struct ath_buf *bf = NULL; |
2c3db3d5 JM |
362 | struct ieee80211_vif *vif; |
363 | int slot; | |
c6820f1e | 364 | u32 bfaddr, bc = 0; |
f078f209 | 365 | |
f078f209 LR |
366 | /* |
367 | * Check if the previous beacon has gone out. If | |
368 | * not don't try to post another, skip this period | |
369 | * and wait for the next. Missed beacons indicate | |
370 | * a problem and should not occur. If we miss too | |
371 | * many consecutive beacons reset the device. | |
372 | */ | |
b77f483f S |
373 | if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { |
374 | sc->beacon.bmisscnt++; | |
9546aae0 | 375 | |
c944daf4 | 376 | if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { |
226afe68 JP |
377 | ath_dbg(common, ATH_DBG_BSTUCK, |
378 | "missed %u consecutive beacons\n", | |
379 | sc->beacon.bmisscnt); | |
efff395e | 380 | ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); |
87c510fe FF |
381 | if (sc->beacon.bmisscnt > 3) |
382 | ath9k_hw_bstuck_nfcal(ah); | |
b77f483f | 383 | } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { |
226afe68 JP |
384 | ath_dbg(common, ATH_DBG_BSTUCK, |
385 | "beacon is officially stuck\n"); | |
b74444f8 | 386 | sc->sc_flags |= SC_OP_TSF_RESET; |
fac6b6a0 | 387 | ath_reset(sc, true); |
f078f209 | 388 | } |
9546aae0 | 389 | |
f078f209 LR |
390 | return; |
391 | } | |
980b24da | 392 | |
f078f209 LR |
393 | /* |
394 | * Generate beacon frames. we are sending frames | |
395 | * staggered so calculate the slot for this frame based | |
396 | * on the tsf to safeguard against missing an swba. | |
397 | */ | |
398 | ||
f078f209 | 399 | |
c6820f1e FF |
400 | if (ah->opmode == NL80211_IFTYPE_AP) { |
401 | u16 intval; | |
402 | u32 tsftu; | |
403 | u64 tsf; | |
404 | ||
405 | intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; | |
406 | tsf = ath9k_hw_gettsf64(ah); | |
407 | tsf += TU_TO_USEC(ah->config.sw_beacon_response_time); | |
408 | tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); | |
409 | slot = (tsftu % (intval * ATH_BCBUF)) / intval; | |
410 | vif = sc->beacon.bslot[slot]; | |
411 | ||
412 | ath_dbg(common, ATH_DBG_BEACON, | |
413 | "slot %d [tsf %llu tsftu %u intval %u] vif %p\n", | |
414 | slot, tsf, tsftu / ATH_BCBUF, intval, vif); | |
415 | } else { | |
416 | slot = 0; | |
417 | vif = sc->beacon.bslot[slot]; | |
418 | } | |
980b24da | 419 | |
980b24da | 420 | |
f078f209 | 421 | bfaddr = 0; |
2c3db3d5 | 422 | if (vif) { |
7545daf4 | 423 | bf = ath_beacon_generate(sc->hw, vif); |
f078f209 LR |
424 | if (bf != NULL) { |
425 | bfaddr = bf->bf_daddr; | |
426 | bc = 1; | |
427 | } | |
c944daf4 FF |
428 | |
429 | if (sc->beacon.bmisscnt != 0) { | |
430 | ath_dbg(common, ATH_DBG_BSTUCK, | |
431 | "resume beacon xmit after %u misses\n", | |
432 | sc->beacon.bmisscnt); | |
433 | sc->beacon.bmisscnt = 0; | |
434 | } | |
f078f209 | 435 | } |
9546aae0 | 436 | |
f078f209 LR |
437 | /* |
438 | * Handle slot time change when a non-ERP station joins/leaves | |
439 | * an 11g network. The 802.11 layer notifies us via callback, | |
440 | * we mark updateslot, then wait one beacon before effecting | |
441 | * the change. This gives associated stations at least one | |
442 | * beacon interval to note the state change. | |
443 | * | |
444 | * NB: The slot time change state machine is clocked according | |
445 | * to whether we are bursting or staggering beacons. We | |
446 | * recognize the request to update and record the current | |
447 | * slot then don't transition until that slot is reached | |
448 | * again. If we miss a beacon for that slot then we'll be | |
449 | * slow to transition but we'll be sure at least one beacon | |
450 | * interval has passed. When bursting slot is always left | |
451 | * set to ATH_BCBUF so this check is a noop. | |
452 | */ | |
b77f483f S |
453 | if (sc->beacon.updateslot == UPDATE) { |
454 | sc->beacon.updateslot = COMMIT; /* commit next beacon */ | |
455 | sc->beacon.slotupdate = slot; | |
456 | } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) { | |
0005baf4 FF |
457 | ah->slottime = sc->beacon.slottime; |
458 | ath9k_hw_init_global_settings(ah); | |
b77f483f | 459 | sc->beacon.updateslot = OK; |
ff37e337 | 460 | } |
f078f209 | 461 | if (bfaddr != 0) { |
f078f209 | 462 | /* NB: cabq traffic should already be queued and primed */ |
b77f483f S |
463 | ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr); |
464 | ath9k_hw_txstart(ah, sc->beacon.beaconq); | |
f078f209 | 465 | |
17d7904d | 466 | sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ |
f078f209 | 467 | } |
f078f209 LR |
468 | } |
469 | ||
21526d57 LR |
470 | static void ath9k_beacon_init(struct ath_softc *sc, |
471 | u32 next_beacon, | |
472 | u32 beacon_period) | |
473 | { | |
dd347f2f | 474 | if (sc->sc_flags & SC_OP_TSF_RESET) { |
21526d57 | 475 | ath9k_ps_wakeup(sc); |
dd347f2f FF |
476 | ath9k_hw_reset_tsf(sc->sc_ah); |
477 | } | |
21526d57 LR |
478 | |
479 | ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period); | |
480 | ||
dd347f2f | 481 | if (sc->sc_flags & SC_OP_TSF_RESET) { |
21526d57 | 482 | ath9k_ps_restore(sc); |
dd347f2f FF |
483 | sc->sc_flags &= ~SC_OP_TSF_RESET; |
484 | } | |
21526d57 LR |
485 | } |
486 | ||
f078f209 | 487 | /* |
5379c8a2 S |
488 | * For multi-bss ap support beacons are either staggered evenly over N slots or |
489 | * burst together. For the former arrange for the SWBA to be delivered for each | |
490 | * slot. Slots that are not occupied will generate nothing. | |
f078f209 | 491 | */ |
5379c8a2 | 492 | static void ath_beacon_config_ap(struct ath_softc *sc, |
d31e20af | 493 | struct ath_beacon_config *conf) |
f078f209 | 494 | { |
3069168c | 495 | struct ath_hw *ah = sc->sc_ah; |
980b24da | 496 | u32 nexttbtt, intval; |
f078f209 | 497 | |
5379c8a2 | 498 | /* NB: the beacon interval is kept internally in TU's */ |
f29f5c08 | 499 | intval = TU_TO_USEC(conf->beacon_interval); |
5379c8a2 S |
500 | intval /= ATH_BCBUF; /* for staggered beacons */ |
501 | nexttbtt = intval; | |
d8728ee9 | 502 | |
5379c8a2 S |
503 | /* |
504 | * In AP mode we enable the beacon timers and SWBA interrupts to | |
505 | * prepare beacon frames. | |
506 | */ | |
3069168c | 507 | ah->imask |= ATH9K_INT_SWBA; |
5379c8a2 | 508 | ath_beaconq_config(sc); |
f078f209 | 509 | |
5379c8a2 | 510 | /* Set the computed AP beacon timers */ |
f078f209 | 511 | |
4df3071e | 512 | ath9k_hw_disable_interrupts(ah); |
21526d57 | 513 | ath9k_beacon_init(sc, nexttbtt, intval); |
5379c8a2 | 514 | sc->beacon.bmisscnt = 0; |
3069168c | 515 | ath9k_hw_set_interrupts(ah, ah->imask); |
5379c8a2 | 516 | } |
459f5f90 | 517 | |
5379c8a2 S |
518 | /* |
519 | * This sets up the beacon timers according to the timestamp of the last | |
520 | * received beacon and the current TSF, configures PCF and DTIM | |
521 | * handling, programs the sleep registers so the hardware will wakeup in | |
522 | * time to receive beacons, and configures the beacon miss handling so | |
523 | * we'll receive a BMISS interrupt when we stop seeing beacons from the AP | |
524 | * we've associated with. | |
525 | */ | |
526 | static void ath_beacon_config_sta(struct ath_softc *sc, | |
d31e20af | 527 | struct ath_beacon_config *conf) |
5379c8a2 | 528 | { |
3069168c PR |
529 | struct ath_hw *ah = sc->sc_ah; |
530 | struct ath_common *common = ath9k_hw_common(ah); | |
5379c8a2 S |
531 | struct ath9k_beacon_state bs; |
532 | int dtimperiod, dtimcount, sleepduration; | |
533 | int cfpperiod, cfpcount; | |
534 | u32 nexttbtt = 0, intval, tsftu; | |
535 | u64 tsf; | |
267a9012 | 536 | int num_beacons, offset, dtim_dec_count, cfp_dec_count; |
5379c8a2 | 537 | |
1a20034a SB |
538 | /* No need to configure beacon if we are not associated */ |
539 | if (!common->curaid) { | |
226afe68 JP |
540 | ath_dbg(common, ATH_DBG_BEACON, |
541 | "STA is not yet associated..skipping beacon config\n"); | |
1a20034a SB |
542 | return; |
543 | } | |
544 | ||
5379c8a2 | 545 | memset(&bs, 0, sizeof(bs)); |
f29f5c08 | 546 | intval = conf->beacon_interval; |
5379c8a2 S |
547 | |
548 | /* | |
549 | * Setup dtim and cfp parameters according to | |
550 | * last beacon we received (which may be none). | |
551 | */ | |
552 | dtimperiod = conf->dtim_period; | |
5379c8a2 S |
553 | dtimcount = conf->dtim_count; |
554 | if (dtimcount >= dtimperiod) /* NB: sanity check */ | |
555 | dtimcount = 0; | |
556 | cfpperiod = 1; /* NB: no PCF support yet */ | |
557 | cfpcount = 0; | |
558 | ||
559 | sleepduration = conf->listen_interval * intval; | |
5379c8a2 S |
560 | |
561 | /* | |
562 | * Pull nexttbtt forward to reflect the current | |
563 | * TSF and calculate dtim+cfp state for the result. | |
564 | */ | |
3069168c | 565 | tsf = ath9k_hw_gettsf64(ah); |
5379c8a2 | 566 | tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; |
267a9012 JM |
567 | |
568 | num_beacons = tsftu / intval + 1; | |
569 | offset = tsftu % intval; | |
570 | nexttbtt = tsftu - offset; | |
571 | if (offset) | |
5379c8a2 | 572 | nexttbtt += intval; |
267a9012 JM |
573 | |
574 | /* DTIM Beacon every dtimperiod Beacon */ | |
575 | dtim_dec_count = num_beacons % dtimperiod; | |
576 | /* CFP every cfpperiod DTIM Beacon */ | |
577 | cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; | |
578 | if (dtim_dec_count) | |
579 | cfp_dec_count++; | |
580 | ||
581 | dtimcount -= dtim_dec_count; | |
582 | if (dtimcount < 0) | |
583 | dtimcount += dtimperiod; | |
584 | ||
585 | cfpcount -= cfp_dec_count; | |
586 | if (cfpcount < 0) | |
587 | cfpcount += cfpperiod; | |
5379c8a2 S |
588 | |
589 | bs.bs_intval = intval; | |
590 | bs.bs_nexttbtt = nexttbtt; | |
591 | bs.bs_dtimperiod = dtimperiod*intval; | |
592 | bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; | |
593 | bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; | |
594 | bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; | |
595 | bs.bs_cfpmaxduration = 0; | |
596 | ||
597 | /* | |
598 | * Calculate the number of consecutive beacons to miss* before taking | |
599 | * a BMISS interrupt. The configuration is specified in TU so we only | |
600 | * need calculate based on the beacon interval. Note that we clamp the | |
601 | * result to at most 15 beacons. | |
602 | */ | |
603 | if (sleepduration > intval) { | |
604 | bs.bs_bmissthreshold = conf->listen_interval * | |
605 | ATH_DEFAULT_BMISS_LIMIT / 2; | |
f078f209 | 606 | } else { |
5379c8a2 S |
607 | bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); |
608 | if (bs.bs_bmissthreshold > 15) | |
609 | bs.bs_bmissthreshold = 15; | |
610 | else if (bs.bs_bmissthreshold <= 0) | |
611 | bs.bs_bmissthreshold = 1; | |
f078f209 LR |
612 | } |
613 | ||
5379c8a2 S |
614 | /* |
615 | * Calculate sleep duration. The configuration is given in ms. | |
616 | * We ensure a multiple of the beacon period is used. Also, if the sleep | |
617 | * duration is greater than the DTIM period then it makes senses | |
618 | * to make it a multiple of that. | |
619 | * | |
620 | * XXX fixed at 100ms | |
621 | */ | |
980b24da | 622 | |
5379c8a2 S |
623 | bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); |
624 | if (bs.bs_sleepduration > bs.bs_dtimperiod) | |
625 | bs.bs_sleepduration = bs.bs_dtimperiod; | |
980b24da | 626 | |
5379c8a2 S |
627 | /* TSF out of range threshold fixed at 1 second */ |
628 | bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; | |
f078f209 | 629 | |
226afe68 JP |
630 | ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); |
631 | ath_dbg(common, ATH_DBG_BEACON, | |
632 | "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", | |
633 | bs.bs_bmissthreshold, bs.bs_sleepduration, | |
634 | bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); | |
f078f209 | 635 | |
5379c8a2 | 636 | /* Set the computed STA beacon timers */ |
980b24da | 637 | |
4df3071e | 638 | ath9k_hw_disable_interrupts(ah); |
3069168c PR |
639 | ath9k_hw_set_sta_beacon_timers(ah, &bs); |
640 | ah->imask |= ATH9K_INT_BMISS; | |
deb75188 RM |
641 | |
642 | /* | |
643 | * If the beacon config is called beacause of TSFOOR, | |
644 | * Interrupts will be enabled back at the end of ath9k_tasklet | |
645 | */ | |
646 | if (!(sc->ps_flags & PS_TSFOOR_SYNC)) | |
647 | ath9k_hw_set_interrupts(ah, ah->imask); | |
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; |
deb75188 RM |
681 | /* |
682 | * If the beacon config is called beacause of TSFOOR, | |
683 | * Interrupts will be enabled back at the end of ath9k_tasklet | |
684 | */ | |
685 | if (!(sc->ps_flags & PS_TSFOOR_SYNC)) | |
686 | ath9k_hw_set_interrupts(ah, ah->imask); | |
f078f209 LR |
687 | } |
688 | ||
99e4d43a RM |
689 | static bool ath9k_allow_beacon_config(struct ath_softc *sc, |
690 | struct ieee80211_vif *vif) | |
f078f209 | 691 | { |
6b96f93e | 692 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
c46917bb | 693 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
99e4d43a RM |
694 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; |
695 | struct ath_vif *avp = (void *)vif->drv_priv; | |
5379c8a2 | 696 | |
99e4d43a RM |
697 | /* |
698 | * Can not have different beacon interval on multiple | |
699 | * AP interface case | |
700 | */ | |
701 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) && | |
702 | (sc->nbcnvifs > 1) && | |
703 | (vif->type == NL80211_IFTYPE_AP) && | |
704 | (cur_conf->beacon_interval != bss_conf->beacon_int)) { | |
705 | ath_dbg(common, ATH_DBG_CONFIG, | |
706 | "Changing beacon interval of multiple \ | |
707 | AP interfaces !\n"); | |
708 | return false; | |
709 | } | |
710 | /* | |
711 | * Can not configure station vif's beacon config | |
712 | * while on AP opmode | |
713 | */ | |
714 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) && | |
715 | (vif->type != NL80211_IFTYPE_AP)) { | |
716 | ath_dbg(common, ATH_DBG_CONFIG, | |
717 | "STA vif's beacon not allowed on AP mode\n"); | |
718 | return false; | |
719 | } | |
720 | /* | |
721 | * Do not allow beacon config if HW was already configured | |
722 | * with another STA vif | |
723 | */ | |
724 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) && | |
725 | (vif->type == NL80211_IFTYPE_STATION) && | |
726 | (sc->sc_flags & SC_OP_BEACONS) && | |
727 | !avp->primary_sta_vif) { | |
728 | ath_dbg(common, ATH_DBG_CONFIG, | |
729 | "Beacon already configured for a station interface\n"); | |
730 | return false; | |
ee832d3e | 731 | } |
99e4d43a RM |
732 | return true; |
733 | } | |
734 | ||
735 | void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) | |
736 | { | |
737 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
738 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; | |
ee832d3e | 739 | |
99e4d43a RM |
740 | if (!ath9k_allow_beacon_config(sc, vif)) |
741 | return; | |
742 | ||
743 | /* Setup the beacon configuration parameters */ | |
744 | cur_conf->beacon_interval = bss_conf->beacon_int; | |
745 | cur_conf->dtim_period = bss_conf->dtim_period; | |
4801416c BG |
746 | cur_conf->listen_interval = 1; |
747 | cur_conf->dtim_count = 1; | |
748 | cur_conf->bmiss_timeout = | |
749 | ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; | |
6b96f93e | 750 | |
c4f9f16b VT |
751 | /* |
752 | * It looks like mac80211 may end up using beacon interval of zero in | |
753 | * some cases (at least for mesh point). Avoid getting into an | |
754 | * infinite loop by using a bit safer value instead. To be safe, | |
755 | * do sanity check on beacon interval for all operating modes. | |
756 | */ | |
757 | if (cur_conf->beacon_interval == 0) | |
758 | cur_conf->beacon_interval = 100; | |
6b96f93e | 759 | |
ee832d3e | 760 | /* |
3a2329f2 MSS |
761 | * We don't parse dtim period from mac80211 during the driver |
762 | * initialization as it breaks association with hidden-ssid | |
763 | * AP and it causes latency in roaming | |
ee832d3e MSS |
764 | */ |
765 | if (cur_conf->dtim_period == 0) | |
766 | cur_conf->dtim_period = 1; | |
767 | ||
99e4d43a | 768 | ath_set_beacon(sc); |
99e4d43a RM |
769 | } |
770 | ||
8e22ad32 RM |
771 | static bool ath_has_valid_bslot(struct ath_softc *sc) |
772 | { | |
773 | struct ath_vif *avp; | |
774 | int slot; | |
775 | bool found = false; | |
776 | ||
777 | for (slot = 0; slot < ATH_BCBUF; slot++) { | |
778 | if (sc->beacon.bslot[slot]) { | |
779 | avp = (void *)sc->beacon.bslot[slot]->drv_priv; | |
780 | if (avp->is_bslot_active) { | |
781 | found = true; | |
782 | break; | |
783 | } | |
784 | } | |
785 | } | |
786 | return found; | |
787 | } | |
788 | ||
789 | ||
99e4d43a RM |
790 | void ath_set_beacon(struct ath_softc *sc) |
791 | { | |
792 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); | |
793 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
794 | ||
26cd322b | 795 | switch (sc->sc_ah->opmode) { |
6b96f93e | 796 | case NL80211_IFTYPE_AP: |
8e22ad32 RM |
797 | if (ath_has_valid_bslot(sc)) |
798 | ath_beacon_config_ap(sc, cur_conf); | |
6b96f93e VT |
799 | break; |
800 | case NL80211_IFTYPE_ADHOC: | |
801 | case NL80211_IFTYPE_MESH_POINT: | |
ee832d3e | 802 | ath_beacon_config_adhoc(sc, cur_conf); |
6b96f93e VT |
803 | break; |
804 | case NL80211_IFTYPE_STATION: | |
805 | ath_beacon_config_sta(sc, cur_conf); | |
806 | break; | |
807 | default: | |
226afe68 JP |
808 | ath_dbg(common, ATH_DBG_CONFIG, |
809 | "Unsupported beaconing mode\n"); | |
6b96f93e VT |
810 | return; |
811 | } | |
812 | ||
813 | sc->sc_flags |= SC_OP_BEACONS; | |
f078f209 | 814 | } |
014cf3bb RM |
815 | |
816 | void ath9k_set_beaconing_status(struct ath_softc *sc, bool status) | |
817 | { | |
818 | struct ath_hw *ah = sc->sc_ah; | |
014cf3bb | 819 | |
8e22ad32 | 820 | if (!ath_has_valid_bslot(sc)) |
99e4d43a RM |
821 | return; |
822 | ||
823 | ath9k_ps_wakeup(sc); | |
824 | if (status) { | |
825 | /* Re-enable beaconing */ | |
826 | ah->imask |= ATH9K_INT_SWBA; | |
827 | ath9k_hw_set_interrupts(ah, ah->imask); | |
014cf3bb RM |
828 | } else { |
829 | /* Disable SWBA interrupt */ | |
830 | ah->imask &= ~ATH9K_INT_SWBA; | |
831 | ath9k_hw_set_interrupts(ah, ah->imask); | |
832 | tasklet_kill(&sc->bcon_tasklet); | |
efff395e | 833 | ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); |
014cf3bb RM |
834 | } |
835 | ath9k_ps_restore(sc); | |
836 | } |