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 | */ |
d47a61aa | 70 | static void ath_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif, |
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; |
d47a61aa | 85 | if (vif->bss_conf.use_short_preamble) |
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; | |
4e0ad259 | 94 | info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_INTREQ; |
493cf04f FF |
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 | ||
d2182b69 | 120 | ath_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb); |
28d16708 FF |
121 | |
122 | if (ath_tx_start(hw, skb, &txctl) != 0) { | |
d2182b69 | 123 | ath_dbg(common, XMIT, "CABQ TX failed\n"); |
28d16708 FF |
124 | dev_kfree_skb_any(skb); |
125 | } | |
126 | } | |
127 | ||
c52f33d0 | 128 | static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw, |
2c3db3d5 | 129 | struct ieee80211_vif *vif) |
f078f209 | 130 | { |
9ac58615 | 131 | struct ath_softc *sc = hw->priv; |
c46917bb | 132 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
f078f209 | 133 | struct ath_buf *bf; |
17d7904d | 134 | struct ath_vif *avp; |
f078f209 | 135 | struct sk_buff *skb; |
f078f209 | 136 | struct ath_txq *cabq; |
147583c0 | 137 | struct ieee80211_tx_info *info; |
980b24da S |
138 | int cabq_depth; |
139 | ||
ba4903f9 FF |
140 | ath9k_reset_beacon_status(sc); |
141 | ||
5640b08e | 142 | avp = (void *)vif->drv_priv; |
b77f483f | 143 | cabq = sc->beacon.cabq; |
f078f209 | 144 | |
014cf3bb | 145 | if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active) |
f078f209 | 146 | return NULL; |
980b24da | 147 | |
9fc9ab0a S |
148 | /* Release the old beacon first */ |
149 | ||
f078f209 | 150 | bf = avp->av_bcbuf; |
a22be22a | 151 | skb = bf->bf_mpdu; |
a8fff50e | 152 | if (skb) { |
c1739eb3 | 153 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 154 | skb->len, DMA_TO_DEVICE); |
3fbb9d95 | 155 | dev_kfree_skb_any(skb); |
6cf9e995 | 156 | bf->bf_buf_addr = 0; |
a8fff50e | 157 | } |
f078f209 | 158 | |
9fc9ab0a S |
159 | /* Get a new beacon from mac80211 */ |
160 | ||
c52f33d0 | 161 | skb = ieee80211_beacon_get(hw, vif); |
a8fff50e JM |
162 | bf->bf_mpdu = skb; |
163 | if (skb == NULL) | |
164 | return NULL; | |
4ed96f04 JM |
165 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
166 | avp->tsf_adjust; | |
980b24da | 167 | |
147583c0 JM |
168 | info = IEEE80211_SKB_CB(skb); |
169 | if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { | |
170 | /* | |
171 | * TODO: make sure the seq# gets assigned properly (vs. other | |
172 | * TX frames) | |
173 | */ | |
980b24da | 174 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b77f483f | 175 | sc->tx.seq_no += 0x10; |
147583c0 | 176 | hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); |
b77f483f | 177 | hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); |
147583c0 | 178 | } |
980b24da | 179 | |
c1739eb3 BG |
180 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
181 | skb->len, DMA_TO_DEVICE); | |
7da3c55c | 182 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
183 | dev_kfree_skb_any(skb); |
184 | bf->bf_mpdu = NULL; | |
6cf9e995 | 185 | bf->bf_buf_addr = 0; |
3800276a | 186 | ath_err(common, "dma_mapping_error on beaconing\n"); |
f8316df1 LR |
187 | return NULL; |
188 | } | |
f078f209 | 189 | |
c52f33d0 | 190 | skb = ieee80211_get_buffered_bc(hw, vif); |
f078f209 | 191 | |
f078f209 LR |
192 | /* |
193 | * if the CABQ traffic from previous DTIM is pending and the current | |
194 | * beacon is also a DTIM. | |
17d7904d S |
195 | * 1) if there is only one vif let the cab traffic continue. |
196 | * 2) if there are more than one vif and we are using staggered | |
f078f209 | 197 | * beacons, then drain the cabq by dropping all the frames in |
17d7904d | 198 | * the cabq so that the current vifs cab traffic can be scheduled. |
f078f209 LR |
199 | */ |
200 | spin_lock_bh(&cabq->axq_lock); | |
201 | cabq_depth = cabq->axq_depth; | |
202 | spin_unlock_bh(&cabq->axq_lock); | |
203 | ||
e022edbd | 204 | if (skb && cabq_depth) { |
17d7904d | 205 | if (sc->nvifs > 1) { |
d2182b69 | 206 | ath_dbg(common, BEACON, |
226afe68 | 207 | "Flushing previous cabq traffic\n"); |
9fc9ab0a | 208 | ath_draintxq(sc, cabq, false); |
f078f209 LR |
209 | } |
210 | } | |
211 | ||
d47a61aa | 212 | ath_beacon_setup(sc, vif, bf, info->control.rates[0].idx); |
f078f209 | 213 | |
e022edbd | 214 | while (skb) { |
c52f33d0 JM |
215 | ath_tx_cabq(hw, skb); |
216 | skb = ieee80211_get_buffered_bc(hw, vif); | |
e022edbd | 217 | } |
f078f209 | 218 | |
f078f209 LR |
219 | return bf; |
220 | } | |
221 | ||
9ac58615 | 222 | int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif) |
f078f209 | 223 | { |
c46917bb | 224 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
17d7904d | 225 | struct ath_vif *avp; |
f078f209 LR |
226 | struct ath_buf *bf; |
227 | struct sk_buff *skb; | |
9814f6b3 | 228 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
459f5f90 | 229 | __le64 tstamp; |
f078f209 | 230 | |
5640b08e | 231 | avp = (void *)vif->drv_priv; |
f078f209 LR |
232 | |
233 | /* Allocate a beacon descriptor if we haven't done so. */ | |
234 | if (!avp->av_bcbuf) { | |
980b24da S |
235 | /* Allocate beacon state for hostap/ibss. We know |
236 | * a buffer is available. */ | |
b77f483f | 237 | avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, |
980b24da | 238 | struct ath_buf, list); |
f078f209 LR |
239 | list_del(&avp->av_bcbuf->list); |
240 | ||
4801416c | 241 | if (ath9k_uses_beacons(vif->type)) { |
f078f209 LR |
242 | int slot; |
243 | /* | |
17d7904d | 244 | * Assign the vif to a beacon xmit slot. As |
f078f209 LR |
245 | * above, this cannot fail to find one. |
246 | */ | |
247 | avp->av_bslot = 0; | |
248 | for (slot = 0; slot < ATH_BCBUF; slot++) | |
2c3db3d5 | 249 | if (sc->beacon.bslot[slot] == NULL) { |
f078f209 | 250 | avp->av_bslot = slot; |
014cf3bb | 251 | avp->is_bslot_active = false; |
774610e4 | 252 | |
f078f209 | 253 | /* NB: keep looking for a double slot */ |
774610e4 FF |
254 | if (slot == 0 || !sc->beacon.bslot[slot-1]) |
255 | break; | |
f078f209 | 256 | } |
2c3db3d5 JM |
257 | BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL); |
258 | sc->beacon.bslot[avp->av_bslot] = vif; | |
17d7904d | 259 | sc->nbcnvifs++; |
f078f209 LR |
260 | } |
261 | } | |
262 | ||
9fc9ab0a | 263 | /* release the previous beacon frame, if it already exists. */ |
f078f209 LR |
264 | bf = avp->av_bcbuf; |
265 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 266 | skb = bf->bf_mpdu; |
c1739eb3 | 267 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 268 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
269 | dev_kfree_skb_any(skb); |
270 | bf->bf_mpdu = NULL; | |
6cf9e995 | 271 | bf->bf_buf_addr = 0; |
f078f209 LR |
272 | } |
273 | ||
9fc9ab0a | 274 | /* NB: the beacon data buffer must be 32-bit aligned. */ |
5640b08e | 275 | skb = ieee80211_beacon_get(sc->hw, vif); |
d7e86c32 | 276 | if (skb == NULL) |
f078f209 | 277 | return -ENOMEM; |
f078f209 | 278 | |
459f5f90 | 279 | tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; |
dd347f2f | 280 | sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp); |
4ed96f04 | 281 | /* Calculate a TSF adjustment factor required for staggered beacons. */ |
f078f209 LR |
282 | if (avp->av_bslot > 0) { |
283 | u64 tsfadjust; | |
f078f209 LR |
284 | int intval; |
285 | ||
9814f6b3 | 286 | intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; |
f078f209 LR |
287 | |
288 | /* | |
4ed96f04 JM |
289 | * Calculate the TSF offset for this beacon slot, i.e., the |
290 | * number of usecs that need to be added to the timestamp field | |
291 | * in Beacon and Probe Response frames. Beacon slot 0 is | |
292 | * processed at the correct offset, so it does not require TSF | |
293 | * adjustment. Other slots are adjusted to get the timestamp | |
294 | * close to the TBTT for the BSS. | |
f078f209 | 295 | */ |
dd347f2f FF |
296 | tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF; |
297 | avp->tsf_adjust = cpu_to_le64(tsfadjust); | |
f078f209 | 298 | |
d2182b69 | 299 | ath_dbg(common, BEACON, |
226afe68 JP |
300 | "stagger beacons, bslot %d intval %u tsfadjust %llu\n", |
301 | avp->av_bslot, intval, (unsigned long long)tsfadjust); | |
f078f209 | 302 | |
4ed96f04 JM |
303 | ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = |
304 | avp->tsf_adjust; | |
305 | } else | |
306 | avp->tsf_adjust = cpu_to_le64(0); | |
f078f209 | 307 | |
f8316df1 | 308 | bf->bf_mpdu = skb; |
c1739eb3 BG |
309 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
310 | skb->len, DMA_TO_DEVICE); | |
7da3c55c | 311 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
312 | dev_kfree_skb_any(skb); |
313 | bf->bf_mpdu = NULL; | |
6cf9e995 | 314 | bf->bf_buf_addr = 0; |
3800276a | 315 | ath_err(common, "dma_mapping_error on beacon alloc\n"); |
f8316df1 LR |
316 | return -ENOMEM; |
317 | } | |
014cf3bb | 318 | avp->is_bslot_active = true; |
f078f209 LR |
319 | |
320 | return 0; | |
321 | } | |
322 | ||
17d7904d | 323 | void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp) |
f078f209 LR |
324 | { |
325 | if (avp->av_bcbuf != NULL) { | |
326 | struct ath_buf *bf; | |
327 | ||
f60c49b6 | 328 | avp->is_bslot_active = false; |
f078f209 | 329 | if (avp->av_bslot != -1) { |
2c3db3d5 | 330 | sc->beacon.bslot[avp->av_bslot] = NULL; |
17d7904d | 331 | sc->nbcnvifs--; |
66da4241 | 332 | avp->av_bslot = -1; |
f078f209 LR |
333 | } |
334 | ||
335 | bf = avp->av_bcbuf; | |
336 | if (bf->bf_mpdu != NULL) { | |
a22be22a | 337 | struct sk_buff *skb = bf->bf_mpdu; |
c1739eb3 | 338 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 339 | skb->len, DMA_TO_DEVICE); |
f078f209 LR |
340 | dev_kfree_skb_any(skb); |
341 | bf->bf_mpdu = NULL; | |
6cf9e995 | 342 | bf->bf_buf_addr = 0; |
f078f209 | 343 | } |
b77f483f | 344 | list_add_tail(&bf->list, &sc->beacon.bbuf); |
f078f209 LR |
345 | |
346 | avp->av_bcbuf = NULL; | |
347 | } | |
348 | } | |
349 | ||
9fc9ab0a | 350 | void ath_beacon_tasklet(unsigned long data) |
f078f209 | 351 | { |
f078f209 | 352 | struct ath_softc *sc = (struct ath_softc *)data; |
9814f6b3 | 353 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
cbe61d8a | 354 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 355 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 356 | struct ath_buf *bf = NULL; |
2c3db3d5 | 357 | struct ieee80211_vif *vif; |
98f0a5eb | 358 | bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); |
2c3db3d5 | 359 | int slot; |
c6820f1e | 360 | u32 bfaddr, bc = 0; |
f078f209 | 361 | |
f078f209 LR |
362 | /* |
363 | * Check if the previous beacon has gone out. If | |
364 | * not don't try to post another, skip this period | |
365 | * and wait for the next. Missed beacons indicate | |
366 | * a problem and should not occur. If we miss too | |
367 | * many consecutive beacons reset the device. | |
368 | */ | |
b77f483f S |
369 | if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { |
370 | sc->beacon.bmisscnt++; | |
9546aae0 | 371 | |
c944daf4 | 372 | if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { |
d2182b69 | 373 | ath_dbg(common, BSTUCK, |
226afe68 JP |
374 | "missed %u consecutive beacons\n", |
375 | sc->beacon.bmisscnt); | |
efff395e | 376 | ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); |
87c510fe FF |
377 | if (sc->beacon.bmisscnt > 3) |
378 | ath9k_hw_bstuck_nfcal(ah); | |
b77f483f | 379 | } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { |
d2182b69 | 380 | ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); |
b74444f8 | 381 | sc->sc_flags |= SC_OP_TSF_RESET; |
236de514 | 382 | ieee80211_queue_work(sc->hw, &sc->hw_reset_work); |
f078f209 | 383 | } |
9546aae0 | 384 | |
f078f209 LR |
385 | return; |
386 | } | |
980b24da | 387 | |
f078f209 LR |
388 | /* |
389 | * Generate beacon frames. we are sending frames | |
390 | * staggered so calculate the slot for this frame based | |
391 | * on the tsf to safeguard against missing an swba. | |
392 | */ | |
393 | ||
f078f209 | 394 | |
c6820f1e FF |
395 | if (ah->opmode == NL80211_IFTYPE_AP) { |
396 | u16 intval; | |
397 | u32 tsftu; | |
398 | u64 tsf; | |
399 | ||
400 | intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; | |
401 | tsf = ath9k_hw_gettsf64(ah); | |
402 | tsf += TU_TO_USEC(ah->config.sw_beacon_response_time); | |
403 | tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); | |
404 | slot = (tsftu % (intval * ATH_BCBUF)) / intval; | |
405 | vif = sc->beacon.bslot[slot]; | |
406 | ||
d2182b69 | 407 | ath_dbg(common, BEACON, |
c6820f1e FF |
408 | "slot %d [tsf %llu tsftu %u intval %u] vif %p\n", |
409 | slot, tsf, tsftu / ATH_BCBUF, intval, vif); | |
410 | } else { | |
411 | slot = 0; | |
412 | vif = sc->beacon.bslot[slot]; | |
413 | } | |
980b24da | 414 | |
980b24da | 415 | |
f078f209 | 416 | bfaddr = 0; |
2c3db3d5 | 417 | if (vif) { |
7545daf4 | 418 | bf = ath_beacon_generate(sc->hw, vif); |
f078f209 LR |
419 | if (bf != NULL) { |
420 | bfaddr = bf->bf_daddr; | |
421 | bc = 1; | |
422 | } | |
c944daf4 FF |
423 | |
424 | if (sc->beacon.bmisscnt != 0) { | |
d2182b69 | 425 | ath_dbg(common, BSTUCK, |
c944daf4 FF |
426 | "resume beacon xmit after %u misses\n", |
427 | sc->beacon.bmisscnt); | |
428 | sc->beacon.bmisscnt = 0; | |
429 | } | |
f078f209 | 430 | } |
9546aae0 | 431 | |
f078f209 LR |
432 | /* |
433 | * Handle slot time change when a non-ERP station joins/leaves | |
434 | * an 11g network. The 802.11 layer notifies us via callback, | |
435 | * we mark updateslot, then wait one beacon before effecting | |
436 | * the change. This gives associated stations at least one | |
437 | * beacon interval to note the state change. | |
438 | * | |
439 | * NB: The slot time change state machine is clocked according | |
440 | * to whether we are bursting or staggering beacons. We | |
441 | * recognize the request to update and record the current | |
442 | * slot then don't transition until that slot is reached | |
443 | * again. If we miss a beacon for that slot then we'll be | |
444 | * slow to transition but we'll be sure at least one beacon | |
445 | * interval has passed. When bursting slot is always left | |
446 | * set to ATH_BCBUF so this check is a noop. | |
447 | */ | |
b77f483f S |
448 | if (sc->beacon.updateslot == UPDATE) { |
449 | sc->beacon.updateslot = COMMIT; /* commit next beacon */ | |
450 | sc->beacon.slotupdate = slot; | |
451 | } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) { | |
0005baf4 FF |
452 | ah->slottime = sc->beacon.slottime; |
453 | ath9k_hw_init_global_settings(ah); | |
b77f483f | 454 | sc->beacon.updateslot = OK; |
ff37e337 | 455 | } |
f078f209 | 456 | if (bfaddr != 0) { |
f078f209 | 457 | /* NB: cabq traffic should already be queued and primed */ |
b77f483f | 458 | ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr); |
98f0a5eb MSS |
459 | |
460 | if (!edma) | |
461 | ath9k_hw_txstart(ah, sc->beacon.beaconq); | |
f078f209 | 462 | |
17d7904d | 463 | sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ |
f078f209 | 464 | } |
f078f209 LR |
465 | } |
466 | ||
21526d57 LR |
467 | static void ath9k_beacon_init(struct ath_softc *sc, |
468 | u32 next_beacon, | |
469 | u32 beacon_period) | |
470 | { | |
dd347f2f | 471 | if (sc->sc_flags & SC_OP_TSF_RESET) { |
21526d57 | 472 | ath9k_ps_wakeup(sc); |
dd347f2f FF |
473 | ath9k_hw_reset_tsf(sc->sc_ah); |
474 | } | |
21526d57 LR |
475 | |
476 | ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period); | |
477 | ||
dd347f2f | 478 | if (sc->sc_flags & SC_OP_TSF_RESET) { |
21526d57 | 479 | ath9k_ps_restore(sc); |
dd347f2f FF |
480 | sc->sc_flags &= ~SC_OP_TSF_RESET; |
481 | } | |
21526d57 LR |
482 | } |
483 | ||
f078f209 | 484 | /* |
5379c8a2 S |
485 | * For multi-bss ap support beacons are either staggered evenly over N slots or |
486 | * burst together. For the former arrange for the SWBA to be delivered for each | |
487 | * slot. Slots that are not occupied will generate nothing. | |
f078f209 | 488 | */ |
5379c8a2 | 489 | static void ath_beacon_config_ap(struct ath_softc *sc, |
d31e20af | 490 | struct ath_beacon_config *conf) |
f078f209 | 491 | { |
3069168c | 492 | struct ath_hw *ah = sc->sc_ah; |
980b24da | 493 | u32 nexttbtt, intval; |
f078f209 | 494 | |
5379c8a2 | 495 | /* NB: the beacon interval is kept internally in TU's */ |
f29f5c08 | 496 | intval = TU_TO_USEC(conf->beacon_interval); |
5379c8a2 S |
497 | intval /= ATH_BCBUF; /* for staggered beacons */ |
498 | nexttbtt = intval; | |
d8728ee9 | 499 | |
5379c8a2 S |
500 | /* |
501 | * In AP mode we enable the beacon timers and SWBA interrupts to | |
502 | * prepare beacon frames. | |
503 | */ | |
3069168c | 504 | ah->imask |= ATH9K_INT_SWBA; |
5379c8a2 | 505 | ath_beaconq_config(sc); |
f078f209 | 506 | |
5379c8a2 | 507 | /* Set the computed AP beacon timers */ |
f078f209 | 508 | |
4df3071e | 509 | ath9k_hw_disable_interrupts(ah); |
c31c8261 | 510 | sc->sc_flags |= SC_OP_TSF_RESET; |
21526d57 | 511 | ath9k_beacon_init(sc, nexttbtt, intval); |
5379c8a2 | 512 | sc->beacon.bmisscnt = 0; |
72d874c6 | 513 | ath9k_hw_set_interrupts(ah); |
b037b693 | 514 | ath9k_hw_enable_interrupts(ah); |
5379c8a2 | 515 | } |
459f5f90 | 516 | |
5379c8a2 S |
517 | /* |
518 | * This sets up the beacon timers according to the timestamp of the last | |
519 | * received beacon and the current TSF, configures PCF and DTIM | |
520 | * handling, programs the sleep registers so the hardware will wakeup in | |
521 | * time to receive beacons, and configures the beacon miss handling so | |
522 | * we'll receive a BMISS interrupt when we stop seeing beacons from the AP | |
523 | * we've associated with. | |
524 | */ | |
525 | static void ath_beacon_config_sta(struct ath_softc *sc, | |
d31e20af | 526 | struct ath_beacon_config *conf) |
5379c8a2 | 527 | { |
3069168c PR |
528 | struct ath_hw *ah = sc->sc_ah; |
529 | struct ath_common *common = ath9k_hw_common(ah); | |
5379c8a2 S |
530 | struct ath9k_beacon_state bs; |
531 | int dtimperiod, dtimcount, sleepduration; | |
532 | int cfpperiod, cfpcount; | |
533 | u32 nexttbtt = 0, intval, tsftu; | |
534 | u64 tsf; | |
267a9012 | 535 | int num_beacons, offset, dtim_dec_count, cfp_dec_count; |
5379c8a2 | 536 | |
1a20034a SB |
537 | /* No need to configure beacon if we are not associated */ |
538 | if (!common->curaid) { | |
d2182b69 | 539 | ath_dbg(common, BEACON, |
226afe68 | 540 | "STA is not yet associated..skipping beacon config\n"); |
1a20034a SB |
541 | return; |
542 | } | |
543 | ||
5379c8a2 | 544 | memset(&bs, 0, sizeof(bs)); |
f29f5c08 | 545 | intval = conf->beacon_interval; |
5379c8a2 S |
546 | |
547 | /* | |
548 | * Setup dtim and cfp parameters according to | |
549 | * last beacon we received (which may be none). | |
550 | */ | |
551 | dtimperiod = conf->dtim_period; | |
5379c8a2 S |
552 | dtimcount = conf->dtim_count; |
553 | if (dtimcount >= dtimperiod) /* NB: sanity check */ | |
554 | dtimcount = 0; | |
555 | cfpperiod = 1; /* NB: no PCF support yet */ | |
556 | cfpcount = 0; | |
557 | ||
558 | sleepduration = conf->listen_interval * intval; | |
5379c8a2 S |
559 | |
560 | /* | |
561 | * Pull nexttbtt forward to reflect the current | |
562 | * TSF and calculate dtim+cfp state for the result. | |
563 | */ | |
3069168c | 564 | tsf = ath9k_hw_gettsf64(ah); |
5379c8a2 | 565 | tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; |
267a9012 JM |
566 | |
567 | num_beacons = tsftu / intval + 1; | |
568 | offset = tsftu % intval; | |
569 | nexttbtt = tsftu - offset; | |
570 | if (offset) | |
5379c8a2 | 571 | nexttbtt += intval; |
267a9012 JM |
572 | |
573 | /* DTIM Beacon every dtimperiod Beacon */ | |
574 | dtim_dec_count = num_beacons % dtimperiod; | |
575 | /* CFP every cfpperiod DTIM Beacon */ | |
576 | cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; | |
577 | if (dtim_dec_count) | |
578 | cfp_dec_count++; | |
579 | ||
580 | dtimcount -= dtim_dec_count; | |
581 | if (dtimcount < 0) | |
582 | dtimcount += dtimperiod; | |
583 | ||
584 | cfpcount -= cfp_dec_count; | |
585 | if (cfpcount < 0) | |
586 | cfpcount += cfpperiod; | |
5379c8a2 S |
587 | |
588 | bs.bs_intval = intval; | |
589 | bs.bs_nexttbtt = nexttbtt; | |
590 | bs.bs_dtimperiod = dtimperiod*intval; | |
591 | bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; | |
592 | bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; | |
593 | bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; | |
594 | bs.bs_cfpmaxduration = 0; | |
595 | ||
596 | /* | |
597 | * Calculate the number of consecutive beacons to miss* before taking | |
598 | * a BMISS interrupt. The configuration is specified in TU so we only | |
599 | * need calculate based on the beacon interval. Note that we clamp the | |
600 | * result to at most 15 beacons. | |
601 | */ | |
602 | if (sleepduration > intval) { | |
603 | bs.bs_bmissthreshold = conf->listen_interval * | |
604 | ATH_DEFAULT_BMISS_LIMIT / 2; | |
f078f209 | 605 | } else { |
5379c8a2 S |
606 | bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); |
607 | if (bs.bs_bmissthreshold > 15) | |
608 | bs.bs_bmissthreshold = 15; | |
609 | else if (bs.bs_bmissthreshold <= 0) | |
610 | bs.bs_bmissthreshold = 1; | |
f078f209 LR |
611 | } |
612 | ||
5379c8a2 S |
613 | /* |
614 | * Calculate sleep duration. The configuration is given in ms. | |
615 | * We ensure a multiple of the beacon period is used. Also, if the sleep | |
616 | * duration is greater than the DTIM period then it makes senses | |
617 | * to make it a multiple of that. | |
618 | * | |
619 | * XXX fixed at 100ms | |
620 | */ | |
980b24da | 621 | |
5379c8a2 S |
622 | bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); |
623 | if (bs.bs_sleepduration > bs.bs_dtimperiod) | |
624 | bs.bs_sleepduration = bs.bs_dtimperiod; | |
980b24da | 625 | |
5379c8a2 S |
626 | /* TSF out of range threshold fixed at 1 second */ |
627 | bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; | |
f078f209 | 628 | |
d2182b69 JP |
629 | ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); |
630 | ath_dbg(common, BEACON, | |
226afe68 JP |
631 | "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", |
632 | bs.bs_bmissthreshold, bs.bs_sleepduration, | |
633 | bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); | |
f078f209 | 634 | |
5379c8a2 | 635 | /* Set the computed STA beacon timers */ |
980b24da | 636 | |
4df3071e | 637 | ath9k_hw_disable_interrupts(ah); |
3069168c PR |
638 | ath9k_hw_set_sta_beacon_timers(ah, &bs); |
639 | ah->imask |= ATH9K_INT_BMISS; | |
deb75188 | 640 | |
72d874c6 | 641 | ath9k_hw_set_interrupts(ah); |
e8fe7336 | 642 | ath9k_hw_enable_interrupts(ah); |
5379c8a2 | 643 | } |
f078f209 | 644 | |
5379c8a2 | 645 | static void ath_beacon_config_adhoc(struct ath_softc *sc, |
ee832d3e | 646 | struct ath_beacon_config *conf) |
5379c8a2 | 647 | { |
3069168c PR |
648 | struct ath_hw *ah = sc->sc_ah; |
649 | struct ath_common *common = ath9k_hw_common(ah); | |
81168e50 | 650 | u32 tsf, intval, nexttbtt; |
dd347f2f | 651 | |
ba4903f9 FF |
652 | ath9k_reset_beacon_status(sc); |
653 | ||
f29f5c08 | 654 | intval = TU_TO_USEC(conf->beacon_interval); |
81168e50 FD |
655 | tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval); |
656 | nexttbtt = tsf + intval; | |
f078f209 | 657 | |
d2182b69 | 658 | ath_dbg(common, BEACON, "IBSS nexttbtt %u intval %u (%u)\n", |
226afe68 | 659 | nexttbtt, intval, conf->beacon_interval); |
9fc9ab0a | 660 | |
5379c8a2 S |
661 | /* |
662 | * In IBSS mode enable the beacon timers but only enable SWBA interrupts | |
663 | * if we need to manually prepare beacon frames. Otherwise we use a | |
664 | * self-linked tx descriptor and let the hardware deal with things. | |
665 | */ | |
a65e4cb4 | 666 | ah->imask |= ATH9K_INT_SWBA; |
9fc9ab0a | 667 | |
5379c8a2 S |
668 | ath_beaconq_config(sc); |
669 | ||
670 | /* Set the computed ADHOC beacon timers */ | |
671 | ||
4df3071e | 672 | ath9k_hw_disable_interrupts(ah); |
21526d57 | 673 | ath9k_beacon_init(sc, nexttbtt, intval); |
5379c8a2 | 674 | sc->beacon.bmisscnt = 0; |
e8fe7336 | 675 | |
72d874c6 | 676 | ath9k_hw_set_interrupts(ah); |
e8fe7336 | 677 | ath9k_hw_enable_interrupts(ah); |
f078f209 LR |
678 | } |
679 | ||
99e4d43a RM |
680 | static bool ath9k_allow_beacon_config(struct ath_softc *sc, |
681 | struct ieee80211_vif *vif) | |
f078f209 | 682 | { |
6b96f93e | 683 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
c46917bb | 684 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
99e4d43a RM |
685 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; |
686 | struct ath_vif *avp = (void *)vif->drv_priv; | |
5379c8a2 | 687 | |
99e4d43a RM |
688 | /* |
689 | * Can not have different beacon interval on multiple | |
690 | * AP interface case | |
691 | */ | |
692 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) && | |
693 | (sc->nbcnvifs > 1) && | |
694 | (vif->type == NL80211_IFTYPE_AP) && | |
695 | (cur_conf->beacon_interval != bss_conf->beacon_int)) { | |
d2182b69 JP |
696 | ath_dbg(common, CONFIG, |
697 | "Changing beacon interval of multiple AP interfaces !\n"); | |
99e4d43a RM |
698 | return false; |
699 | } | |
700 | /* | |
701 | * Can not configure station vif's beacon config | |
702 | * while on AP opmode | |
703 | */ | |
704 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) && | |
705 | (vif->type != NL80211_IFTYPE_AP)) { | |
d2182b69 | 706 | ath_dbg(common, CONFIG, |
99e4d43a RM |
707 | "STA vif's beacon not allowed on AP mode\n"); |
708 | return false; | |
709 | } | |
710 | /* | |
711 | * Do not allow beacon config if HW was already configured | |
712 | * with another STA vif | |
713 | */ | |
714 | if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) && | |
715 | (vif->type == NL80211_IFTYPE_STATION) && | |
716 | (sc->sc_flags & SC_OP_BEACONS) && | |
717 | !avp->primary_sta_vif) { | |
d2182b69 | 718 | ath_dbg(common, CONFIG, |
99e4d43a RM |
719 | "Beacon already configured for a station interface\n"); |
720 | return false; | |
ee832d3e | 721 | } |
99e4d43a RM |
722 | return true; |
723 | } | |
724 | ||
725 | void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) | |
726 | { | |
727 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
728 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; | |
ee832d3e | 729 | |
99e4d43a RM |
730 | if (!ath9k_allow_beacon_config(sc, vif)) |
731 | return; | |
732 | ||
733 | /* Setup the beacon configuration parameters */ | |
734 | cur_conf->beacon_interval = bss_conf->beacon_int; | |
735 | cur_conf->dtim_period = bss_conf->dtim_period; | |
4801416c BG |
736 | cur_conf->listen_interval = 1; |
737 | cur_conf->dtim_count = 1; | |
738 | cur_conf->bmiss_timeout = | |
739 | ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; | |
6b96f93e | 740 | |
c4f9f16b VT |
741 | /* |
742 | * It looks like mac80211 may end up using beacon interval of zero in | |
743 | * some cases (at least for mesh point). Avoid getting into an | |
744 | * infinite loop by using a bit safer value instead. To be safe, | |
745 | * do sanity check on beacon interval for all operating modes. | |
746 | */ | |
747 | if (cur_conf->beacon_interval == 0) | |
748 | cur_conf->beacon_interval = 100; | |
6b96f93e | 749 | |
ee832d3e | 750 | /* |
3a2329f2 MSS |
751 | * We don't parse dtim period from mac80211 during the driver |
752 | * initialization as it breaks association with hidden-ssid | |
753 | * AP and it causes latency in roaming | |
ee832d3e MSS |
754 | */ |
755 | if (cur_conf->dtim_period == 0) | |
756 | cur_conf->dtim_period = 1; | |
757 | ||
99e4d43a | 758 | ath_set_beacon(sc); |
99e4d43a RM |
759 | } |
760 | ||
8e22ad32 RM |
761 | static bool ath_has_valid_bslot(struct ath_softc *sc) |
762 | { | |
763 | struct ath_vif *avp; | |
764 | int slot; | |
765 | bool found = false; | |
766 | ||
767 | for (slot = 0; slot < ATH_BCBUF; slot++) { | |
768 | if (sc->beacon.bslot[slot]) { | |
769 | avp = (void *)sc->beacon.bslot[slot]->drv_priv; | |
770 | if (avp->is_bslot_active) { | |
771 | found = true; | |
772 | break; | |
773 | } | |
774 | } | |
775 | } | |
776 | return found; | |
777 | } | |
778 | ||
779 | ||
99e4d43a RM |
780 | void ath_set_beacon(struct ath_softc *sc) |
781 | { | |
782 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); | |
783 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
784 | ||
26cd322b | 785 | switch (sc->sc_ah->opmode) { |
6b96f93e | 786 | case NL80211_IFTYPE_AP: |
8e22ad32 RM |
787 | if (ath_has_valid_bslot(sc)) |
788 | ath_beacon_config_ap(sc, cur_conf); | |
6b96f93e VT |
789 | break; |
790 | case NL80211_IFTYPE_ADHOC: | |
791 | case NL80211_IFTYPE_MESH_POINT: | |
ee832d3e | 792 | ath_beacon_config_adhoc(sc, cur_conf); |
6b96f93e VT |
793 | break; |
794 | case NL80211_IFTYPE_STATION: | |
795 | ath_beacon_config_sta(sc, cur_conf); | |
796 | break; | |
797 | default: | |
d2182b69 | 798 | ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); |
6b96f93e VT |
799 | return; |
800 | } | |
801 | ||
802 | sc->sc_flags |= SC_OP_BEACONS; | |
f078f209 | 803 | } |
014cf3bb RM |
804 | |
805 | void ath9k_set_beaconing_status(struct ath_softc *sc, bool status) | |
806 | { | |
807 | struct ath_hw *ah = sc->sc_ah; | |
014cf3bb | 808 | |
8e22ad32 | 809 | if (!ath_has_valid_bslot(sc)) |
99e4d43a RM |
810 | return; |
811 | ||
812 | ath9k_ps_wakeup(sc); | |
813 | if (status) { | |
814 | /* Re-enable beaconing */ | |
815 | ah->imask |= ATH9K_INT_SWBA; | |
72d874c6 | 816 | ath9k_hw_set_interrupts(ah); |
014cf3bb RM |
817 | } else { |
818 | /* Disable SWBA interrupt */ | |
819 | ah->imask &= ~ATH9K_INT_SWBA; | |
72d874c6 | 820 | ath9k_hw_set_interrupts(ah); |
014cf3bb | 821 | tasklet_kill(&sc->bcon_tasklet); |
efff395e | 822 | ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); |
014cf3bb RM |
823 | } |
824 | ath9k_ps_restore(sc); | |
825 | } |