Commit | Line | Data |
---|---|---|
f078f209 | 1 | /* |
cee075a2 | 2 | * Copyright (c) 2008-2009 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 | ||
f078f209 | 21 | /* |
f078f209 LR |
22 | * This function will modify certain transmit queue properties depending on |
23 | * the operating mode of the station (AP or AdHoc). Parameters are AIFS | |
24 | * settings and channel width min/max | |
25 | */ | |
94db2936 | 26 | int ath_beaconq_config(struct ath_softc *sc) |
f078f209 | 27 | { |
cbe61d8a | 28 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 29 | struct ath_common *common = ath9k_hw_common(ah); |
94db2936 VN |
30 | struct ath9k_tx_queue_info qi, qi_be; |
31 | int qnum; | |
f078f209 | 32 | |
b77f483f | 33 | ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi); |
2660b81a | 34 | if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { |
f078f209 LR |
35 | /* Always burst out beacon and CAB traffic. */ |
36 | qi.tqi_aifs = 1; | |
37 | qi.tqi_cwmin = 0; | |
38 | qi.tqi_cwmax = 0; | |
39 | } else { | |
40 | /* Adhoc mode; important thing is to use 2x cwmin. */ | |
94db2936 VN |
41 | qnum = ath_tx_get_qnum(sc, ATH9K_TX_QUEUE_DATA, |
42 | ATH9K_WME_AC_BE); | |
43 | ath9k_hw_get_txq_props(ah, qnum, &qi_be); | |
44 | qi.tqi_aifs = qi_be.tqi_aifs; | |
45 | qi.tqi_cwmin = 4*qi_be.tqi_cwmin; | |
46 | qi.tqi_cwmax = qi_be.tqi_cwmax; | |
f078f209 LR |
47 | } |
48 | ||
b77f483f | 49 | if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { |
c46917bb LR |
50 | ath_print(common, ATH_DBG_FATAL, |
51 | "Unable to update h/w beacon queue parameters\n"); | |
f078f209 LR |
52 | return 0; |
53 | } else { | |
9fc9ab0a | 54 | ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); |
f078f209 LR |
55 | return 1; |
56 | } | |
57 | } | |
58 | ||
59 | /* | |
f078f209 LR |
60 | * Associates the beacon frame buffer with a transmit descriptor. Will set |
61 | * up all required antenna switch parameters, rate codes, and channel flags. | |
62 | * Beacons are always sent out at the lowest rate, and are not retried. | |
63 | */ | |
9fc9ab0a | 64 | static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp, |
64b84010 | 65 | struct ath_buf *bf, int rateidx) |
f078f209 | 66 | { |
a22be22a | 67 | struct sk_buff *skb = bf->bf_mpdu; |
cbe61d8a | 68 | struct ath_hw *ah = sc->sc_ah; |
43c27613 | 69 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 70 | struct ath_desc *ds; |
980b24da | 71 | struct ath9k_11n_rate_series series[4]; |
9fc9ab0a | 72 | int flags, antenna, ctsrate = 0, ctsduration = 0; |
545750d3 FF |
73 | struct ieee80211_supported_band *sband; |
74 | u8 rate = 0; | |
f078f209 | 75 | |
f078f209 | 76 | ds = bf->bf_desc; |
f078f209 LR |
77 | flags = ATH9K_TXDESC_NOACK; |
78 | ||
9cb5412b PE |
79 | if (((sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) || |
80 | (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) && | |
2660b81a | 81 | (ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) { |
f078f209 LR |
82 | ds->ds_link = bf->bf_daddr; /* self-linked */ |
83 | flags |= ATH9K_TXDESC_VEOL; | |
84 | /* Let hardware handle antenna switching. */ | |
85 | antenna = 0; | |
86 | } else { | |
87 | ds->ds_link = 0; | |
88 | /* | |
89 | * Switch antenna every beacon. | |
9fc9ab0a S |
90 | * Should only switch every beacon period, not for every SWBA |
91 | * XXX assumes two antennae | |
f078f209 | 92 | */ |
17d7904d | 93 | antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1); |
f078f209 LR |
94 | } |
95 | ||
96 | ds->ds_data = bf->bf_buf_addr; | |
97 | ||
545750d3 | 98 | sband = &sc->sbands[common->hw->conf.channel->band]; |
64b84010 | 99 | rate = sband->bitrates[rateidx].hw_value; |
672840ac | 100 | if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) |
64b84010 | 101 | rate |= sband->bitrates[rateidx].hw_value_short; |
9fc9ab0a S |
102 | |
103 | ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN, | |
104 | ATH9K_PKT_TYPE_BEACON, | |
105 | MAX_RATE_POWER, | |
106 | ATH9K_TXKEYIX_INVALID, | |
107 | ATH9K_KEY_TYPE_CLEAR, | |
108 | flags); | |
f078f209 LR |
109 | |
110 | /* NB: beacon's BufLen must be a multiple of 4 bytes */ | |
9fc9ab0a S |
111 | ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4), |
112 | true, true, ds); | |
f078f209 | 113 | |
0345f37b | 114 | memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); |
f078f209 LR |
115 | series[0].Tries = 1; |
116 | series[0].Rate = rate; | |
43c27613 | 117 | series[0].ChSel = common->tx_chainmask; |
f078f209 | 118 | series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0; |
9fc9ab0a S |
119 | ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration, |
120 | series, 4, 0); | |
f078f209 LR |
121 | } |
122 | ||
c52f33d0 | 123 | static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw, |
2c3db3d5 | 124 | struct ieee80211_vif *vif) |
f078f209 | 125 | { |
c52f33d0 JM |
126 | struct ath_wiphy *aphy = hw->priv; |
127 | struct ath_softc *sc = aphy->sc; | |
c46917bb | 128 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
f078f209 | 129 | struct ath_buf *bf; |
17d7904d | 130 | struct ath_vif *avp; |
f078f209 | 131 | struct sk_buff *skb; |
f078f209 | 132 | struct ath_txq *cabq; |
147583c0 | 133 | struct ieee80211_tx_info *info; |
980b24da S |
134 | int cabq_depth; |
135 | ||
f0ed85c6 JM |
136 | if (aphy->state != ATH_WIPHY_ACTIVE) |
137 | return NULL; | |
138 | ||
5640b08e | 139 | avp = (void *)vif->drv_priv; |
b77f483f | 140 | cabq = sc->beacon.cabq; |
f078f209 | 141 | |
d8baa939 | 142 | if (avp->av_bcbuf == NULL) |
f078f209 | 143 | return NULL; |
980b24da | 144 | |
9fc9ab0a S |
145 | /* Release the old beacon first */ |
146 | ||
f078f209 | 147 | bf = avp->av_bcbuf; |
a22be22a | 148 | skb = bf->bf_mpdu; |
a8fff50e | 149 | if (skb) { |
7da3c55c | 150 | dma_unmap_single(sc->dev, bf->bf_dmacontext, |
9fc9ab0a | 151 | skb->len, DMA_TO_DEVICE); |
3fbb9d95 | 152 | dev_kfree_skb_any(skb); |
a8fff50e | 153 | } |
f078f209 | 154 | |
9fc9ab0a S |
155 | /* Get a new beacon from mac80211 */ |
156 | ||
c52f33d0 | 157 | skb = ieee80211_beacon_get(hw, vif); |
a8fff50e JM |
158 | bf->bf_mpdu = skb; |
159 | if (skb == NULL) | |
160 | return NULL; | |
4ed96f04 JM |
161 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
162 | avp->tsf_adjust; | |
980b24da | 163 | |
147583c0 JM |
164 | info = IEEE80211_SKB_CB(skb); |
165 | if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { | |
166 | /* | |
167 | * TODO: make sure the seq# gets assigned properly (vs. other | |
168 | * TX frames) | |
169 | */ | |
980b24da | 170 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b77f483f | 171 | sc->tx.seq_no += 0x10; |
147583c0 | 172 | hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); |
b77f483f | 173 | hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); |
147583c0 | 174 | } |
980b24da | 175 | |
a8fff50e | 176 | bf->bf_buf_addr = bf->bf_dmacontext = |
7da3c55c | 177 | dma_map_single(sc->dev, skb->data, |
9fc9ab0a | 178 | skb->len, DMA_TO_DEVICE); |
7da3c55c | 179 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
180 | dev_kfree_skb_any(skb); |
181 | bf->bf_mpdu = NULL; | |
c46917bb LR |
182 | ath_print(common, ATH_DBG_FATAL, |
183 | "dma_mapping_error on beaconing\n"); | |
f8316df1 LR |
184 | return NULL; |
185 | } | |
f078f209 | 186 | |
c52f33d0 | 187 | skb = ieee80211_get_buffered_bc(hw, vif); |
f078f209 | 188 | |
f078f209 LR |
189 | /* |
190 | * if the CABQ traffic from previous DTIM is pending and the current | |
191 | * beacon is also a DTIM. | |
17d7904d S |
192 | * 1) if there is only one vif let the cab traffic continue. |
193 | * 2) if there are more than one vif and we are using staggered | |
f078f209 | 194 | * beacons, then drain the cabq by dropping all the frames in |
17d7904d | 195 | * the cabq so that the current vifs cab traffic can be scheduled. |
f078f209 LR |
196 | */ |
197 | spin_lock_bh(&cabq->axq_lock); | |
198 | cabq_depth = cabq->axq_depth; | |
199 | spin_unlock_bh(&cabq->axq_lock); | |
200 | ||
e022edbd | 201 | if (skb && cabq_depth) { |
17d7904d | 202 | if (sc->nvifs > 1) { |
c46917bb LR |
203 | ath_print(common, ATH_DBG_BEACON, |
204 | "Flushing previous cabq traffic\n"); | |
9fc9ab0a | 205 | ath_draintxq(sc, cabq, false); |
f078f209 LR |
206 | } |
207 | } | |
208 | ||
64b84010 | 209 | ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx); |
f078f209 | 210 | |
e022edbd | 211 | while (skb) { |
c52f33d0 JM |
212 | ath_tx_cabq(hw, skb); |
213 | skb = ieee80211_get_buffered_bc(hw, vif); | |
e022edbd | 214 | } |
f078f209 | 215 | |
f078f209 LR |
216 | return bf; |
217 | } | |
218 | ||
219 | /* | |
220 | * Startup beacon transmission for adhoc mode when they are sent entirely | |
221 | * by the hardware using the self-linked descriptor + veol trick. | |
222 | */ | |
2c3db3d5 JM |
223 | static void ath_beacon_start_adhoc(struct ath_softc *sc, |
224 | struct ieee80211_vif *vif) | |
f078f209 | 225 | { |
cbe61d8a | 226 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 227 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 228 | struct ath_buf *bf; |
17d7904d | 229 | struct ath_vif *avp; |
f078f209 LR |
230 | struct sk_buff *skb; |
231 | ||
5640b08e | 232 | avp = (void *)vif->drv_priv; |
f078f209 | 233 | |
9fc9ab0a | 234 | if (avp->av_bcbuf == NULL) |
f078f209 | 235 | return; |
9fc9ab0a | 236 | |
f078f209 | 237 | bf = avp->av_bcbuf; |
a22be22a | 238 | skb = bf->bf_mpdu; |
f078f209 | 239 | |
64b84010 | 240 | ath_beacon_setup(sc, avp, bf, 0); |
f078f209 LR |
241 | |
242 | /* NB: caller is known to have already stopped tx dma */ | |
b77f483f S |
243 | ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); |
244 | ath9k_hw_txstart(ah, sc->beacon.beaconq); | |
c46917bb LR |
245 | ath_print(common, ATH_DBG_BEACON, "TXDP%u = %llx (%p)\n", |
246 | sc->beacon.beaconq, ito64(bf->bf_daddr), bf->bf_desc); | |
f078f209 LR |
247 | } |
248 | ||
c52f33d0 | 249 | int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif) |
f078f209 | 250 | { |
c52f33d0 | 251 | struct ath_softc *sc = aphy->sc; |
c46917bb | 252 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
17d7904d | 253 | struct ath_vif *avp; |
f078f209 LR |
254 | struct ath_buf *bf; |
255 | struct sk_buff *skb; | |
459f5f90 | 256 | __le64 tstamp; |
f078f209 | 257 | |
5640b08e | 258 | avp = (void *)vif->drv_priv; |
f078f209 LR |
259 | |
260 | /* Allocate a beacon descriptor if we haven't done so. */ | |
261 | if (!avp->av_bcbuf) { | |
980b24da S |
262 | /* Allocate beacon state for hostap/ibss. We know |
263 | * a buffer is available. */ | |
b77f483f | 264 | avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, |
980b24da | 265 | struct ath_buf, list); |
f078f209 LR |
266 | list_del(&avp->av_bcbuf->list); |
267 | ||
2660b81a S |
268 | if (sc->sc_ah->opmode == NL80211_IFTYPE_AP || |
269 | !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) { | |
f078f209 LR |
270 | int slot; |
271 | /* | |
17d7904d | 272 | * Assign the vif to a beacon xmit slot. As |
f078f209 LR |
273 | * above, this cannot fail to find one. |
274 | */ | |
275 | avp->av_bslot = 0; | |
276 | for (slot = 0; slot < ATH_BCBUF; slot++) | |
2c3db3d5 | 277 | if (sc->beacon.bslot[slot] == NULL) { |
f078f209 LR |
278 | /* |
279 | * XXX hack, space out slots to better | |
280 | * deal with misses | |
281 | */ | |
282 | if (slot+1 < ATH_BCBUF && | |
2c3db3d5 | 283 | sc->beacon.bslot[slot+1] == NULL) { |
f078f209 LR |
284 | avp->av_bslot = slot+1; |
285 | break; | |
286 | } | |
287 | avp->av_bslot = slot; | |
288 | /* NB: keep looking for a double slot */ | |
289 | } | |
2c3db3d5 JM |
290 | BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL); |
291 | sc->beacon.bslot[avp->av_bslot] = vif; | |
c52f33d0 | 292 | sc->beacon.bslot_aphy[avp->av_bslot] = aphy; |
17d7904d | 293 | sc->nbcnvifs++; |
f078f209 LR |
294 | } |
295 | } | |
296 | ||
9fc9ab0a | 297 | /* release the previous beacon frame, if it already exists. */ |
f078f209 LR |
298 | bf = avp->av_bcbuf; |
299 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 300 | skb = bf->bf_mpdu; |
7da3c55c | 301 | dma_unmap_single(sc->dev, bf->bf_dmacontext, |
9fc9ab0a | 302 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
303 | dev_kfree_skb_any(skb); |
304 | bf->bf_mpdu = NULL; | |
305 | } | |
306 | ||
9fc9ab0a | 307 | /* NB: the beacon data buffer must be 32-bit aligned. */ |
5640b08e | 308 | skb = ieee80211_beacon_get(sc->hw, vif); |
f078f209 | 309 | if (skb == NULL) { |
c46917bb | 310 | ath_print(common, ATH_DBG_BEACON, "cannot get skb\n"); |
f078f209 LR |
311 | return -ENOMEM; |
312 | } | |
313 | ||
459f5f90 | 314 | tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; |
b77f483f | 315 | sc->beacon.bc_tstamp = le64_to_cpu(tstamp); |
4ed96f04 | 316 | /* Calculate a TSF adjustment factor required for staggered beacons. */ |
f078f209 LR |
317 | if (avp->av_bslot > 0) { |
318 | u64 tsfadjust; | |
f078f209 LR |
319 | int intval; |
320 | ||
57c4d7b4 | 321 | intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; |
f078f209 LR |
322 | |
323 | /* | |
4ed96f04 JM |
324 | * Calculate the TSF offset for this beacon slot, i.e., the |
325 | * number of usecs that need to be added to the timestamp field | |
326 | * in Beacon and Probe Response frames. Beacon slot 0 is | |
327 | * processed at the correct offset, so it does not require TSF | |
328 | * adjustment. Other slots are adjusted to get the timestamp | |
329 | * close to the TBTT for the BSS. | |
f078f209 | 330 | */ |
4ed96f04 JM |
331 | tsfadjust = intval * avp->av_bslot / ATH_BCBUF; |
332 | avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); | |
f078f209 | 333 | |
c46917bb LR |
334 | ath_print(common, ATH_DBG_BEACON, |
335 | "stagger beacons, bslot %d intval " | |
336 | "%u tsfadjust %llu\n", | |
337 | avp->av_bslot, intval, (unsigned long long)tsfadjust); | |
f078f209 | 338 | |
4ed96f04 JM |
339 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
340 | avp->tsf_adjust; | |
341 | } else | |
342 | avp->tsf_adjust = cpu_to_le64(0); | |
f078f209 | 343 | |
f8316df1 | 344 | bf->bf_mpdu = skb; |
a8fff50e | 345 | bf->bf_buf_addr = bf->bf_dmacontext = |
7da3c55c | 346 | dma_map_single(sc->dev, skb->data, |
9fc9ab0a | 347 | skb->len, DMA_TO_DEVICE); |
7da3c55c | 348 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
349 | dev_kfree_skb_any(skb); |
350 | bf->bf_mpdu = NULL; | |
c46917bb LR |
351 | ath_print(common, ATH_DBG_FATAL, |
352 | "dma_mapping_error on beacon alloc\n"); | |
f8316df1 LR |
353 | return -ENOMEM; |
354 | } | |
f078f209 LR |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
17d7904d | 359 | void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp) |
f078f209 LR |
360 | { |
361 | if (avp->av_bcbuf != NULL) { | |
362 | struct ath_buf *bf; | |
363 | ||
364 | if (avp->av_bslot != -1) { | |
2c3db3d5 | 365 | sc->beacon.bslot[avp->av_bslot] = NULL; |
c52f33d0 | 366 | sc->beacon.bslot_aphy[avp->av_bslot] = NULL; |
17d7904d | 367 | sc->nbcnvifs--; |
f078f209 LR |
368 | } |
369 | ||
370 | bf = avp->av_bcbuf; | |
371 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 372 | struct sk_buff *skb = bf->bf_mpdu; |
7da3c55c | 373 | dma_unmap_single(sc->dev, bf->bf_dmacontext, |
9fc9ab0a | 374 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
375 | dev_kfree_skb_any(skb); |
376 | bf->bf_mpdu = NULL; | |
377 | } | |
b77f483f | 378 | list_add_tail(&bf->list, &sc->beacon.bbuf); |
f078f209 LR |
379 | |
380 | avp->av_bcbuf = NULL; | |
381 | } | |
382 | } | |
383 | ||
9fc9ab0a | 384 | void ath_beacon_tasklet(unsigned long data) |
f078f209 | 385 | { |
f078f209 | 386 | struct ath_softc *sc = (struct ath_softc *)data; |
cbe61d8a | 387 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 388 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 389 | struct ath_buf *bf = NULL; |
2c3db3d5 | 390 | struct ieee80211_vif *vif; |
c52f33d0 | 391 | struct ath_wiphy *aphy; |
2c3db3d5 | 392 | int slot; |
9546aae0 | 393 | u32 bfaddr, bc = 0, tsftu; |
f078f209 | 394 | u64 tsf; |
f078f209 LR |
395 | u16 intval; |
396 | ||
f078f209 LR |
397 | /* |
398 | * Check if the previous beacon has gone out. If | |
399 | * not don't try to post another, skip this period | |
400 | * and wait for the next. Missed beacons indicate | |
401 | * a problem and should not occur. If we miss too | |
402 | * many consecutive beacons reset the device. | |
403 | */ | |
b77f483f S |
404 | if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { |
405 | sc->beacon.bmisscnt++; | |
9546aae0 | 406 | |
b77f483f | 407 | if (sc->beacon.bmisscnt < BSTUCK_THRESH) { |
c46917bb LR |
408 | ath_print(common, ATH_DBG_BEACON, |
409 | "missed %u consecutive beacons\n", | |
410 | sc->beacon.bmisscnt); | |
b77f483f | 411 | } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { |
c46917bb LR |
412 | ath_print(common, ATH_DBG_BEACON, |
413 | "beacon is officially stuck\n"); | |
b74444f8 | 414 | sc->sc_flags |= SC_OP_TSF_RESET; |
9546aae0 | 415 | ath_reset(sc, false); |
f078f209 | 416 | } |
9546aae0 | 417 | |
f078f209 LR |
418 | return; |
419 | } | |
980b24da | 420 | |
b77f483f | 421 | if (sc->beacon.bmisscnt != 0) { |
c46917bb LR |
422 | ath_print(common, ATH_DBG_BEACON, |
423 | "resume beacon xmit after %u misses\n", | |
424 | sc->beacon.bmisscnt); | |
b77f483f | 425 | sc->beacon.bmisscnt = 0; |
f078f209 LR |
426 | } |
427 | ||
428 | /* | |
429 | * Generate beacon frames. we are sending frames | |
430 | * staggered so calculate the slot for this frame based | |
431 | * on the tsf to safeguard against missing an swba. | |
432 | */ | |
433 | ||
57c4d7b4 | 434 | intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; |
f078f209 LR |
435 | |
436 | tsf = ath9k_hw_gettsf64(ah); | |
437 | tsftu = TSF_TO_TU(tsf>>32, tsf); | |
438 | slot = ((tsftu % intval) * ATH_BCBUF) / intval; | |
4ed96f04 JM |
439 | /* |
440 | * Reverse the slot order to get slot 0 on the TBTT offset that does | |
441 | * not require TSF adjustment and other slots adding | |
442 | * slot/ATH_BCBUF * beacon_int to timestamp. For example, with | |
443 | * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 .. | |
444 | * and slot 0 is at correct offset to TBTT. | |
445 | */ | |
446 | slot = ATH_BCBUF - slot - 1; | |
447 | vif = sc->beacon.bslot[slot]; | |
448 | aphy = sc->beacon.bslot_aphy[slot]; | |
980b24da | 449 | |
c46917bb LR |
450 | ath_print(common, ATH_DBG_BEACON, |
451 | "slot %d [tsf %llu tsftu %u intval %u] vif %p\n", | |
452 | slot, tsf, tsftu, intval, vif); | |
980b24da | 453 | |
f078f209 | 454 | bfaddr = 0; |
2c3db3d5 | 455 | if (vif) { |
c52f33d0 | 456 | bf = ath_beacon_generate(aphy->hw, vif); |
f078f209 LR |
457 | if (bf != NULL) { |
458 | bfaddr = bf->bf_daddr; | |
459 | bc = 1; | |
460 | } | |
461 | } | |
9546aae0 | 462 | |
f078f209 LR |
463 | /* |
464 | * Handle slot time change when a non-ERP station joins/leaves | |
465 | * an 11g network. The 802.11 layer notifies us via callback, | |
466 | * we mark updateslot, then wait one beacon before effecting | |
467 | * the change. This gives associated stations at least one | |
468 | * beacon interval to note the state change. | |
469 | * | |
470 | * NB: The slot time change state machine is clocked according | |
471 | * to whether we are bursting or staggering beacons. We | |
472 | * recognize the request to update and record the current | |
473 | * slot then don't transition until that slot is reached | |
474 | * again. If we miss a beacon for that slot then we'll be | |
475 | * slow to transition but we'll be sure at least one beacon | |
476 | * interval has passed. When bursting slot is always left | |
477 | * set to ATH_BCBUF so this check is a noop. | |
478 | */ | |
b77f483f S |
479 | if (sc->beacon.updateslot == UPDATE) { |
480 | sc->beacon.updateslot = COMMIT; /* commit next beacon */ | |
481 | sc->beacon.slotupdate = slot; | |
482 | } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) { | |
0005baf4 FF |
483 | ah->slottime = sc->beacon.slottime; |
484 | ath9k_hw_init_global_settings(ah); | |
b77f483f | 485 | sc->beacon.updateslot = OK; |
ff37e337 | 486 | } |
f078f209 LR |
487 | if (bfaddr != 0) { |
488 | /* | |
489 | * Stop any current dma and put the new frame(s) on the queue. | |
490 | * This should never fail since we check above that no frames | |
491 | * are still pending on the queue. | |
492 | */ | |
b77f483f | 493 | if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) { |
c46917bb | 494 | ath_print(common, ATH_DBG_FATAL, |
b77f483f | 495 | "beacon queue %u did not stop?\n", sc->beacon.beaconq); |
f078f209 LR |
496 | } |
497 | ||
498 | /* NB: cabq traffic should already be queued and primed */ | |
b77f483f S |
499 | ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr); |
500 | ath9k_hw_txstart(ah, sc->beacon.beaconq); | |
f078f209 | 501 | |
17d7904d | 502 | sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ |
f078f209 | 503 | } |
f078f209 LR |
504 | } |
505 | ||
21526d57 LR |
506 | static void ath9k_beacon_init(struct ath_softc *sc, |
507 | u32 next_beacon, | |
508 | u32 beacon_period) | |
509 | { | |
510 | if (beacon_period & ATH9K_BEACON_RESET_TSF) | |
511 | ath9k_ps_wakeup(sc); | |
512 | ||
513 | ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period); | |
514 | ||
515 | if (beacon_period & ATH9K_BEACON_RESET_TSF) | |
516 | ath9k_ps_restore(sc); | |
517 | } | |
518 | ||
f078f209 | 519 | /* |
5379c8a2 S |
520 | * For multi-bss ap support beacons are either staggered evenly over N slots or |
521 | * burst together. For the former arrange for the SWBA to be delivered for each | |
522 | * slot. Slots that are not occupied will generate nothing. | |
f078f209 | 523 | */ |
5379c8a2 | 524 | static void ath_beacon_config_ap(struct ath_softc *sc, |
d31e20af | 525 | struct ath_beacon_config *conf) |
f078f209 | 526 | { |
980b24da | 527 | u32 nexttbtt, intval; |
f078f209 | 528 | |
5379c8a2 S |
529 | /* NB: the beacon interval is kept internally in TU's */ |
530 | intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; | |
531 | intval /= ATH_BCBUF; /* for staggered beacons */ | |
532 | nexttbtt = intval; | |
d8728ee9 FF |
533 | |
534 | if (sc->sc_flags & SC_OP_TSF_RESET) | |
535 | intval |= ATH9K_BEACON_RESET_TSF; | |
f078f209 | 536 | |
5379c8a2 S |
537 | /* |
538 | * In AP mode we enable the beacon timers and SWBA interrupts to | |
539 | * prepare beacon frames. | |
540 | */ | |
541 | intval |= ATH9K_BEACON_ENA; | |
542 | sc->imask |= ATH9K_INT_SWBA; | |
543 | ath_beaconq_config(sc); | |
f078f209 | 544 | |
5379c8a2 | 545 | /* Set the computed AP beacon timers */ |
f078f209 | 546 | |
5379c8a2 | 547 | ath9k_hw_set_interrupts(sc->sc_ah, 0); |
21526d57 | 548 | ath9k_beacon_init(sc, nexttbtt, intval); |
5379c8a2 S |
549 | sc->beacon.bmisscnt = 0; |
550 | ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); | |
b238e90e S |
551 | |
552 | /* Clear the reset TSF flag, so that subsequent beacon updation | |
553 | will not reset the HW TSF. */ | |
554 | ||
555 | sc->sc_flags &= ~SC_OP_TSF_RESET; | |
5379c8a2 | 556 | } |
459f5f90 | 557 | |
5379c8a2 S |
558 | /* |
559 | * This sets up the beacon timers according to the timestamp of the last | |
560 | * received beacon and the current TSF, configures PCF and DTIM | |
561 | * handling, programs the sleep registers so the hardware will wakeup in | |
562 | * time to receive beacons, and configures the beacon miss handling so | |
563 | * we'll receive a BMISS interrupt when we stop seeing beacons from the AP | |
564 | * we've associated with. | |
565 | */ | |
566 | static void ath_beacon_config_sta(struct ath_softc *sc, | |
d31e20af | 567 | struct ath_beacon_config *conf) |
5379c8a2 | 568 | { |
c46917bb | 569 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
5379c8a2 S |
570 | struct ath9k_beacon_state bs; |
571 | int dtimperiod, dtimcount, sleepduration; | |
572 | int cfpperiod, cfpcount; | |
573 | u32 nexttbtt = 0, intval, tsftu; | |
574 | u64 tsf; | |
267a9012 | 575 | int num_beacons, offset, dtim_dec_count, cfp_dec_count; |
5379c8a2 | 576 | |
1a20034a SB |
577 | /* No need to configure beacon if we are not associated */ |
578 | if (!common->curaid) { | |
579 | ath_print(common, ATH_DBG_BEACON, | |
580 | "STA is not yet associated..skipping beacon config\n"); | |
581 | return; | |
582 | } | |
583 | ||
5379c8a2 S |
584 | memset(&bs, 0, sizeof(bs)); |
585 | intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; | |
586 | ||
587 | /* | |
588 | * Setup dtim and cfp parameters according to | |
589 | * last beacon we received (which may be none). | |
590 | */ | |
591 | dtimperiod = conf->dtim_period; | |
592 | if (dtimperiod <= 0) /* NB: 0 if not known */ | |
593 | dtimperiod = 1; | |
594 | dtimcount = conf->dtim_count; | |
595 | if (dtimcount >= dtimperiod) /* NB: sanity check */ | |
596 | dtimcount = 0; | |
597 | cfpperiod = 1; /* NB: no PCF support yet */ | |
598 | cfpcount = 0; | |
599 | ||
600 | sleepduration = conf->listen_interval * intval; | |
601 | if (sleepduration <= 0) | |
602 | sleepduration = intval; | |
603 | ||
604 | /* | |
605 | * Pull nexttbtt forward to reflect the current | |
606 | * TSF and calculate dtim+cfp state for the result. | |
607 | */ | |
608 | tsf = ath9k_hw_gettsf64(sc->sc_ah); | |
609 | tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; | |
267a9012 JM |
610 | |
611 | num_beacons = tsftu / intval + 1; | |
612 | offset = tsftu % intval; | |
613 | nexttbtt = tsftu - offset; | |
614 | if (offset) | |
5379c8a2 | 615 | nexttbtt += intval; |
267a9012 JM |
616 | |
617 | /* DTIM Beacon every dtimperiod Beacon */ | |
618 | dtim_dec_count = num_beacons % dtimperiod; | |
619 | /* CFP every cfpperiod DTIM Beacon */ | |
620 | cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; | |
621 | if (dtim_dec_count) | |
622 | cfp_dec_count++; | |
623 | ||
624 | dtimcount -= dtim_dec_count; | |
625 | if (dtimcount < 0) | |
626 | dtimcount += dtimperiod; | |
627 | ||
628 | cfpcount -= cfp_dec_count; | |
629 | if (cfpcount < 0) | |
630 | cfpcount += cfpperiod; | |
5379c8a2 S |
631 | |
632 | bs.bs_intval = intval; | |
633 | bs.bs_nexttbtt = nexttbtt; | |
634 | bs.bs_dtimperiod = dtimperiod*intval; | |
635 | bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; | |
636 | bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; | |
637 | bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; | |
638 | bs.bs_cfpmaxduration = 0; | |
639 | ||
640 | /* | |
641 | * Calculate the number of consecutive beacons to miss* before taking | |
642 | * a BMISS interrupt. The configuration is specified in TU so we only | |
643 | * need calculate based on the beacon interval. Note that we clamp the | |
644 | * result to at most 15 beacons. | |
645 | */ | |
646 | if (sleepduration > intval) { | |
647 | bs.bs_bmissthreshold = conf->listen_interval * | |
648 | ATH_DEFAULT_BMISS_LIMIT / 2; | |
f078f209 | 649 | } else { |
5379c8a2 S |
650 | bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); |
651 | if (bs.bs_bmissthreshold > 15) | |
652 | bs.bs_bmissthreshold = 15; | |
653 | else if (bs.bs_bmissthreshold <= 0) | |
654 | bs.bs_bmissthreshold = 1; | |
f078f209 LR |
655 | } |
656 | ||
5379c8a2 S |
657 | /* |
658 | * Calculate sleep duration. The configuration is given in ms. | |
659 | * We ensure a multiple of the beacon period is used. Also, if the sleep | |
660 | * duration is greater than the DTIM period then it makes senses | |
661 | * to make it a multiple of that. | |
662 | * | |
663 | * XXX fixed at 100ms | |
664 | */ | |
980b24da | 665 | |
5379c8a2 S |
666 | bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); |
667 | if (bs.bs_sleepduration > bs.bs_dtimperiod) | |
668 | bs.bs_sleepduration = bs.bs_dtimperiod; | |
980b24da | 669 | |
5379c8a2 S |
670 | /* TSF out of range threshold fixed at 1 second */ |
671 | bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; | |
f078f209 | 672 | |
c46917bb LR |
673 | ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); |
674 | ath_print(common, ATH_DBG_BEACON, | |
675 | "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", | |
676 | bs.bs_bmissthreshold, bs.bs_sleepduration, | |
677 | bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); | |
f078f209 | 678 | |
5379c8a2 | 679 | /* Set the computed STA beacon timers */ |
980b24da | 680 | |
5379c8a2 S |
681 | ath9k_hw_set_interrupts(sc->sc_ah, 0); |
682 | ath9k_hw_set_sta_beacon_timers(sc->sc_ah, &bs); | |
683 | sc->imask |= ATH9K_INT_BMISS; | |
684 | ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); | |
685 | } | |
f078f209 | 686 | |
5379c8a2 S |
687 | static void ath_beacon_config_adhoc(struct ath_softc *sc, |
688 | struct ath_beacon_config *conf, | |
2c3db3d5 | 689 | struct ieee80211_vif *vif) |
5379c8a2 | 690 | { |
c46917bb | 691 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
5379c8a2 S |
692 | u64 tsf; |
693 | u32 tsftu, intval, nexttbtt; | |
f078f209 | 694 | |
5379c8a2 | 695 | intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; |
f078f209 | 696 | |
546256fb | 697 | |
5379c8a2 | 698 | /* Pull nexttbtt forward to reflect the current TSF */ |
4af9cf4f | 699 | |
5379c8a2 S |
700 | nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp); |
701 | if (nexttbtt == 0) | |
702 | nexttbtt = intval; | |
703 | else if (intval) | |
704 | nexttbtt = roundup(nexttbtt, intval); | |
9fc9ab0a | 705 | |
5379c8a2 S |
706 | tsf = ath9k_hw_gettsf64(sc->sc_ah); |
707 | tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE; | |
708 | do { | |
709 | nexttbtt += intval; | |
710 | } while (nexttbtt < tsftu); | |
f078f209 | 711 | |
c46917bb LR |
712 | ath_print(common, ATH_DBG_BEACON, |
713 | "IBSS nexttbtt %u intval %u (%u)\n", | |
714 | nexttbtt, intval, conf->beacon_interval); | |
9fc9ab0a | 715 | |
5379c8a2 S |
716 | /* |
717 | * In IBSS mode enable the beacon timers but only enable SWBA interrupts | |
718 | * if we need to manually prepare beacon frames. Otherwise we use a | |
719 | * self-linked tx descriptor and let the hardware deal with things. | |
720 | */ | |
721 | intval |= ATH9K_BEACON_ENA; | |
722 | if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) | |
723 | sc->imask |= ATH9K_INT_SWBA; | |
9fc9ab0a | 724 | |
5379c8a2 S |
725 | ath_beaconq_config(sc); |
726 | ||
727 | /* Set the computed ADHOC beacon timers */ | |
728 | ||
729 | ath9k_hw_set_interrupts(sc->sc_ah, 0); | |
21526d57 | 730 | ath9k_beacon_init(sc, nexttbtt, intval); |
5379c8a2 S |
731 | sc->beacon.bmisscnt = 0; |
732 | ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); | |
733 | ||
6b96f93e VT |
734 | /* FIXME: Handle properly when vif is NULL */ |
735 | if (vif && sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL) | |
2c3db3d5 | 736 | ath_beacon_start_adhoc(sc, vif); |
f078f209 LR |
737 | } |
738 | ||
2c3db3d5 | 739 | void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) |
f078f209 | 740 | { |
6b96f93e | 741 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
c46917bb | 742 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
6b96f93e | 743 | enum nl80211_iftype iftype; |
5379c8a2 S |
744 | |
745 | /* Setup the beacon configuration parameters */ | |
2c3db3d5 | 746 | if (vif) { |
6b96f93e VT |
747 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; |
748 | ||
749 | iftype = vif->type; | |
5379c8a2 | 750 | |
6b96f93e VT |
751 | cur_conf->beacon_interval = bss_conf->beacon_int; |
752 | cur_conf->dtim_period = bss_conf->dtim_period; | |
753 | cur_conf->listen_interval = 1; | |
754 | cur_conf->dtim_count = 1; | |
755 | cur_conf->bmiss_timeout = | |
756 | ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; | |
757 | } else { | |
758 | iftype = sc->sc_ah->opmode; | |
5379c8a2 | 759 | } |
6b96f93e | 760 | |
c4f9f16b VT |
761 | /* |
762 | * It looks like mac80211 may end up using beacon interval of zero in | |
763 | * some cases (at least for mesh point). Avoid getting into an | |
764 | * infinite loop by using a bit safer value instead. To be safe, | |
765 | * do sanity check on beacon interval for all operating modes. | |
766 | */ | |
767 | if (cur_conf->beacon_interval == 0) | |
768 | cur_conf->beacon_interval = 100; | |
6b96f93e VT |
769 | |
770 | switch (iftype) { | |
771 | case NL80211_IFTYPE_AP: | |
772 | ath_beacon_config_ap(sc, cur_conf); | |
773 | break; | |
774 | case NL80211_IFTYPE_ADHOC: | |
775 | case NL80211_IFTYPE_MESH_POINT: | |
776 | ath_beacon_config_adhoc(sc, cur_conf, vif); | |
777 | break; | |
778 | case NL80211_IFTYPE_STATION: | |
779 | ath_beacon_config_sta(sc, cur_conf); | |
780 | break; | |
781 | default: | |
c46917bb LR |
782 | ath_print(common, ATH_DBG_CONFIG, |
783 | "Unsupported beaconing mode\n"); | |
6b96f93e VT |
784 | return; |
785 | } | |
786 | ||
787 | sc->sc_flags |= SC_OP_BEACONS; | |
f078f209 | 788 | } |