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 | */ | |
7e52c8aa | 33 | static void ath9k_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); |
7e52c8aa | 41 | |
2664d666 TP |
42 | if (sc->sc_ah->opmode == NL80211_IFTYPE_AP || |
43 | sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) { | |
f078f209 LR |
44 | /* Always burst out beacon and CAB traffic. */ |
45 | qi.tqi_aifs = 1; | |
46 | qi.tqi_cwmin = 0; | |
47 | qi.tqi_cwmax = 0; | |
48 | } else { | |
49 | /* Adhoc mode; important thing is to use 2x cwmin. */ | |
bea843c7 | 50 | txq = sc->tx.txq_map[IEEE80211_AC_BE]; |
066dae93 | 51 | ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be); |
94db2936 | 52 | qi.tqi_aifs = qi_be.tqi_aifs; |
d202caff VN |
53 | if (ah->slottime == ATH9K_SLOT_TIME_20) |
54 | qi.tqi_cwmin = 2*qi_be.tqi_cwmin; | |
55 | else | |
56 | qi.tqi_cwmin = 4*qi_be.tqi_cwmin; | |
94db2936 | 57 | qi.tqi_cwmax = qi_be.tqi_cwmax; |
f078f209 LR |
58 | } |
59 | ||
b77f483f | 60 | if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { |
7e52c8aa | 61 | ath_err(common, "Unable to update h/w beacon queue parameters\n"); |
f078f209 | 62 | } else { |
9fc9ab0a | 63 | ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); |
f078f209 LR |
64 | } |
65 | } | |
66 | ||
67 | /* | |
f078f209 | 68 | * Associates the beacon frame buffer with a transmit descriptor. Will set |
dd347f2f FF |
69 | * up rate codes, and channel flags. Beacons are always sent out at the |
70 | * lowest rate, and are not retried. | |
f078f209 | 71 | */ |
fb6e252f | 72 | static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif, |
64b84010 | 73 | struct ath_buf *bf, int rateidx) |
f078f209 | 74 | { |
a22be22a | 75 | struct sk_buff *skb = bf->bf_mpdu; |
cbe61d8a | 76 | struct ath_hw *ah = sc->sc_ah; |
43c27613 | 77 | struct ath_common *common = ath9k_hw_common(ah); |
493cf04f | 78 | struct ath_tx_info info; |
545750d3 | 79 | struct ieee80211_supported_band *sband; |
493cf04f | 80 | u8 chainmask = ah->txchainmask; |
545750d3 | 81 | u8 rate = 0; |
f078f209 | 82 | |
675a0b04 | 83 | sband = &sc->sbands[common->hw->conf.chandef.chan->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; | |
cd484aeb | 94 | info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK; |
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 | ||
fb6e252f | 111 | static void ath9k_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb) |
28d16708 | 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"); |
249ee722 | 124 | ieee80211_free_txskb(hw, skb); |
28d16708 FF |
125 | } |
126 | } | |
127 | ||
fb6e252f SM |
128 | static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw, |
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; |
aa45fe96 | 134 | struct ath_vif *avp = (void *)vif->drv_priv; |
f078f209 | 135 | struct sk_buff *skb; |
aa45fe96 | 136 | struct ath_txq *cabq = sc->beacon.cabq; |
147583c0 | 137 | struct ieee80211_tx_info *info; |
fb6e252f | 138 | struct ieee80211_mgmt *mgmt_hdr; |
980b24da S |
139 | int cabq_depth; |
140 | ||
aa45fe96 | 141 | if (avp->av_bcbuf == NULL) |
f078f209 | 142 | return NULL; |
980b24da | 143 | |
f078f209 | 144 | bf = avp->av_bcbuf; |
a22be22a | 145 | skb = bf->bf_mpdu; |
a8fff50e | 146 | if (skb) { |
c1739eb3 | 147 | dma_unmap_single(sc->dev, bf->bf_buf_addr, |
9fc9ab0a | 148 | skb->len, DMA_TO_DEVICE); |
3fbb9d95 | 149 | dev_kfree_skb_any(skb); |
6cf9e995 | 150 | bf->bf_buf_addr = 0; |
1adb2e2b | 151 | bf->bf_mpdu = NULL; |
a8fff50e | 152 | } |
f078f209 | 153 | |
c52f33d0 | 154 | skb = ieee80211_beacon_get(hw, vif); |
a8fff50e JM |
155 | if (skb == NULL) |
156 | return NULL; | |
fb6e252f SM |
157 | |
158 | bf->bf_mpdu = skb; | |
159 | ||
160 | mgmt_hdr = (struct ieee80211_mgmt *)skb->data; | |
161 | mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust; | |
980b24da | 162 | |
147583c0 JM |
163 | info = IEEE80211_SKB_CB(skb); |
164 | if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { | |
165 | /* | |
166 | * TODO: make sure the seq# gets assigned properly (vs. other | |
167 | * TX frames) | |
168 | */ | |
980b24da | 169 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b77f483f | 170 | sc->tx.seq_no += 0x10; |
147583c0 | 171 | hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); |
b77f483f | 172 | hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); |
147583c0 | 173 | } |
980b24da | 174 | |
c1739eb3 BG |
175 | bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
176 | skb->len, DMA_TO_DEVICE); | |
7da3c55c | 177 | if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { |
f8316df1 LR |
178 | dev_kfree_skb_any(skb); |
179 | bf->bf_mpdu = NULL; | |
6cf9e995 | 180 | bf->bf_buf_addr = 0; |
3800276a | 181 | ath_err(common, "dma_mapping_error on beaconing\n"); |
f8316df1 LR |
182 | return NULL; |
183 | } | |
f078f209 | 184 | |
c52f33d0 | 185 | skb = ieee80211_get_buffered_bc(hw, vif); |
f078f209 | 186 | |
f078f209 LR |
187 | /* |
188 | * if the CABQ traffic from previous DTIM is pending and the current | |
189 | * beacon is also a DTIM. | |
17d7904d S |
190 | * 1) if there is only one vif let the cab traffic continue. |
191 | * 2) if there are more than one vif and we are using staggered | |
f078f209 | 192 | * beacons, then drain the cabq by dropping all the frames in |
17d7904d | 193 | * the cabq so that the current vifs cab traffic can be scheduled. |
f078f209 LR |
194 | */ |
195 | spin_lock_bh(&cabq->axq_lock); | |
196 | cabq_depth = cabq->axq_depth; | |
197 | spin_unlock_bh(&cabq->axq_lock); | |
198 | ||
e022edbd | 199 | if (skb && cabq_depth) { |
17d7904d | 200 | if (sc->nvifs > 1) { |
d2182b69 | 201 | ath_dbg(common, BEACON, |
226afe68 | 202 | "Flushing previous cabq traffic\n"); |
1381559b | 203 | ath_draintxq(sc, cabq); |
f078f209 LR |
204 | } |
205 | } | |
206 | ||
fb6e252f | 207 | ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx); |
f078f209 | 208 | |
e022edbd | 209 | while (skb) { |
fb6e252f | 210 | ath9k_tx_cabq(hw, skb); |
c52f33d0 | 211 | skb = ieee80211_get_buffered_bc(hw, vif); |
e022edbd | 212 | } |
f078f209 | 213 | |
f078f209 LR |
214 | return bf; |
215 | } | |
216 | ||
130ef6e9 | 217 | void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif) |
f078f209 | 218 | { |
c46917bb | 219 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
130ef6e9 SM |
220 | struct ath_vif *avp = (void *)vif->drv_priv; |
221 | int slot; | |
f078f209 | 222 | |
130ef6e9 SM |
223 | avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list); |
224 | list_del(&avp->av_bcbuf->list); | |
f078f209 | 225 | |
130ef6e9 SM |
226 | for (slot = 0; slot < ATH_BCBUF; slot++) { |
227 | if (sc->beacon.bslot[slot] == NULL) { | |
228 | avp->av_bslot = slot; | |
130ef6e9 | 229 | break; |
f078f209 LR |
230 | } |
231 | } | |
232 | ||
130ef6e9 SM |
233 | sc->beacon.bslot[avp->av_bslot] = vif; |
234 | sc->nbcnvifs++; | |
f078f209 | 235 | |
130ef6e9 SM |
236 | ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n", |
237 | avp->av_bslot); | |
238 | } | |
f078f209 | 239 | |
130ef6e9 SM |
240 | void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif) |
241 | { | |
242 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); | |
243 | struct ath_vif *avp = (void *)vif->drv_priv; | |
244 | struct ath_buf *bf = avp->av_bcbuf; | |
f078f209 | 245 | |
130ef6e9 SM |
246 | ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n", |
247 | avp->av_bslot); | |
f078f209 | 248 | |
130ef6e9 | 249 | tasklet_disable(&sc->bcon_tasklet); |
f078f209 | 250 | |
130ef6e9 SM |
251 | if (bf && bf->bf_mpdu) { |
252 | struct sk_buff *skb = bf->bf_mpdu; | |
253 | dma_unmap_single(sc->dev, bf->bf_buf_addr, | |
254 | skb->len, DMA_TO_DEVICE); | |
f8316df1 LR |
255 | dev_kfree_skb_any(skb); |
256 | bf->bf_mpdu = NULL; | |
6cf9e995 | 257 | bf->bf_buf_addr = 0; |
f8316df1 | 258 | } |
f078f209 | 259 | |
130ef6e9 | 260 | avp->av_bcbuf = NULL; |
130ef6e9 SM |
261 | sc->beacon.bslot[avp->av_bslot] = NULL; |
262 | sc->nbcnvifs--; | |
263 | list_add_tail(&bf->list, &sc->beacon.bbuf); | |
f078f209 | 264 | |
130ef6e9 | 265 | tasklet_enable(&sc->bcon_tasklet); |
f078f209 LR |
266 | } |
267 | ||
fb6e252f SM |
268 | static int ath9k_beacon_choose_slot(struct ath_softc *sc) |
269 | { | |
270 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); | |
271 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
272 | u16 intval; | |
273 | u32 tsftu; | |
274 | u64 tsf; | |
275 | int slot; | |
276 | ||
2664d666 TP |
277 | if (sc->sc_ah->opmode != NL80211_IFTYPE_AP && |
278 | sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) { | |
fb6e252f SM |
279 | ath_dbg(common, BEACON, "slot 0, tsf: %llu\n", |
280 | ath9k_hw_gettsf64(sc->sc_ah)); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; | |
285 | tsf = ath9k_hw_gettsf64(sc->sc_ah); | |
286 | tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time); | |
287 | tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); | |
288 | slot = (tsftu % (intval * ATH_BCBUF)) / intval; | |
289 | ||
290 | ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n", | |
291 | slot, tsf, tsftu / ATH_BCBUF); | |
292 | ||
293 | return slot; | |
294 | } | |
295 | ||
2f8e82e8 SM |
296 | void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif) |
297 | { | |
298 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); | |
299 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
300 | struct ath_vif *avp = (void *)vif->drv_priv; | |
301 | u64 tsfadjust; | |
302 | ||
303 | if (avp->av_bslot == 0) | |
304 | return; | |
305 | ||
306 | tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF; | |
307 | avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); | |
308 | ||
309 | ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", | |
310 | (unsigned long long)tsfadjust, avp->av_bslot); | |
311 | } | |
312 | ||
fb6e252f | 313 | void ath9k_beacon_tasklet(unsigned long data) |
f078f209 | 314 | { |
f078f209 | 315 | struct ath_softc *sc = (struct ath_softc *)data; |
cbe61d8a | 316 | struct ath_hw *ah = sc->sc_ah; |
c46917bb | 317 | struct ath_common *common = ath9k_hw_common(ah); |
f078f209 | 318 | struct ath_buf *bf = NULL; |
2c3db3d5 | 319 | struct ieee80211_vif *vif; |
98f0a5eb | 320 | bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); |
2c3db3d5 | 321 | int slot; |
f078f209 | 322 | |
124b979b | 323 | if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) { |
4e7fb718 RM |
324 | ath_dbg(common, RESET, |
325 | "reset work is pending, skip beaconing now\n"); | |
326 | return; | |
327 | } | |
124b979b | 328 | |
f078f209 LR |
329 | /* |
330 | * Check if the previous beacon has gone out. If | |
331 | * not don't try to post another, skip this period | |
332 | * and wait for the next. Missed beacons indicate | |
333 | * a problem and should not occur. If we miss too | |
334 | * many consecutive beacons reset the device. | |
335 | */ | |
b77f483f S |
336 | if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { |
337 | sc->beacon.bmisscnt++; | |
9546aae0 | 338 | |
b381fa32 FF |
339 | if (!ath9k_hw_check_alive(ah)) |
340 | ieee80211_queue_work(sc->hw, &sc->hw_check_work); | |
341 | ||
c944daf4 | 342 | if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { |
d2182b69 | 343 | ath_dbg(common, BSTUCK, |
226afe68 JP |
344 | "missed %u consecutive beacons\n", |
345 | sc->beacon.bmisscnt); | |
efff395e | 346 | ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); |
87c510fe FF |
347 | if (sc->beacon.bmisscnt > 3) |
348 | ath9k_hw_bstuck_nfcal(ah); | |
b77f483f | 349 | } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { |
d2182b69 | 350 | ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); |
4e7fb718 | 351 | sc->beacon.bmisscnt = 0; |
124b979b | 352 | ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); |
f078f209 | 353 | } |
9546aae0 | 354 | |
f078f209 LR |
355 | return; |
356 | } | |
980b24da | 357 | |
fb6e252f SM |
358 | slot = ath9k_beacon_choose_slot(sc); |
359 | vif = sc->beacon.bslot[slot]; | |
980b24da | 360 | |
fb6e252f SM |
361 | if (!vif || !vif->bss_conf.enable_beacon) |
362 | return; | |
980b24da | 363 | |
fb6e252f | 364 | bf = ath9k_beacon_generate(sc->hw, vif); |
c944daf4 | 365 | |
fb6e252f SM |
366 | if (sc->beacon.bmisscnt != 0) { |
367 | ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", | |
368 | sc->beacon.bmisscnt); | |
369 | sc->beacon.bmisscnt = 0; | |
f078f209 | 370 | } |
9546aae0 | 371 | |
f078f209 LR |
372 | /* |
373 | * Handle slot time change when a non-ERP station joins/leaves | |
374 | * an 11g network. The 802.11 layer notifies us via callback, | |
375 | * we mark updateslot, then wait one beacon before effecting | |
376 | * the change. This gives associated stations at least one | |
377 | * beacon interval to note the state change. | |
378 | * | |
379 | * NB: The slot time change state machine is clocked according | |
380 | * to whether we are bursting or staggering beacons. We | |
381 | * recognize the request to update and record the current | |
382 | * slot then don't transition until that slot is reached | |
383 | * again. If we miss a beacon for that slot then we'll be | |
384 | * slow to transition but we'll be sure at least one beacon | |
385 | * interval has passed. When bursting slot is always left | |
386 | * set to ATH_BCBUF so this check is a noop. | |
387 | */ | |
b77f483f | 388 | if (sc->beacon.updateslot == UPDATE) { |
fb6e252f | 389 | sc->beacon.updateslot = COMMIT; |
b77f483f | 390 | sc->beacon.slotupdate = slot; |
fb6e252f SM |
391 | } else if (sc->beacon.updateslot == COMMIT && |
392 | sc->beacon.slotupdate == slot) { | |
0005baf4 FF |
393 | ah->slottime = sc->beacon.slottime; |
394 | ath9k_hw_init_global_settings(ah); | |
b77f483f | 395 | sc->beacon.updateslot = OK; |
ff37e337 | 396 | } |
fb6e252f SM |
397 | |
398 | if (bf) { | |
399 | ath9k_reset_beacon_status(sc); | |
400 | ||
401 | ath_dbg(common, BEACON, | |
402 | "Transmitting beacon for slot: %d\n", slot); | |
403 | ||
f078f209 | 404 | /* NB: cabq traffic should already be queued and primed */ |
fb6e252f | 405 | ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); |
98f0a5eb MSS |
406 | |
407 | if (!edma) | |
408 | ath9k_hw_txstart(ah, sc->beacon.beaconq); | |
f078f209 | 409 | } |
f078f209 LR |
410 | } |
411 | ||
1a6404a1 SM |
412 | /* |
413 | * Both nexttbtt and intval have to be in usecs. | |
414 | */ | |
415 | static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, | |
416 | u32 intval, bool reset_tsf) | |
21526d57 | 417 | { |
ef4ad633 | 418 | struct ath_hw *ah = sc->sc_ah; |
21526d57 | 419 | |
ef4ad633 | 420 | ath9k_hw_disable_interrupts(ah); |
1a6404a1 SM |
421 | if (reset_tsf) |
422 | ath9k_hw_reset_tsf(ah); | |
7e52c8aa | 423 | ath9k_beaconq_config(sc); |
ef4ad633 SM |
424 | ath9k_hw_beaconinit(ah, nexttbtt, intval); |
425 | sc->beacon.bmisscnt = 0; | |
426 | ath9k_hw_set_interrupts(ah); | |
427 | ath9k_hw_enable_interrupts(ah); | |
21526d57 LR |
428 | } |
429 | ||
f078f209 | 430 | /* |
5379c8a2 S |
431 | * For multi-bss ap support beacons are either staggered evenly over N slots or |
432 | * burst together. For the former arrange for the SWBA to be delivered for each | |
433 | * slot. Slots that are not occupied will generate nothing. | |
f078f209 | 434 | */ |
ef4ad633 SM |
435 | static void ath9k_beacon_config_ap(struct ath_softc *sc, |
436 | struct ath_beacon_config *conf) | |
f078f209 | 437 | { |
3069168c | 438 | struct ath_hw *ah = sc->sc_ah; |
ef4ad633 | 439 | struct ath_common *common = ath9k_hw_common(ah); |
980b24da | 440 | u32 nexttbtt, intval; |
f078f209 | 441 | |
5379c8a2 | 442 | /* NB: the beacon interval is kept internally in TU's */ |
f29f5c08 | 443 | intval = TU_TO_USEC(conf->beacon_interval); |
ef4ad633 | 444 | intval /= ATH_BCBUF; |
5379c8a2 | 445 | nexttbtt = intval; |
d8728ee9 | 446 | |
ef4ad633 SM |
447 | if (conf->enable_beacon) |
448 | ah->imask |= ATH9K_INT_SWBA; | |
449 | else | |
450 | ah->imask &= ~ATH9K_INT_SWBA; | |
f078f209 | 451 | |
1a6404a1 SM |
452 | ath_dbg(common, BEACON, |
453 | "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", | |
454 | (conf->enable_beacon) ? "Enable" : "Disable", | |
ef4ad633 | 455 | nexttbtt, intval, conf->beacon_interval); |
f078f209 | 456 | |
1a6404a1 | 457 | ath9k_beacon_init(sc, nexttbtt, intval, true); |
5379c8a2 | 458 | } |
459f5f90 | 459 | |
5379c8a2 S |
460 | /* |
461 | * This sets up the beacon timers according to the timestamp of the last | |
462 | * received beacon and the current TSF, configures PCF and DTIM | |
463 | * handling, programs the sleep registers so the hardware will wakeup in | |
464 | * time to receive beacons, and configures the beacon miss handling so | |
465 | * we'll receive a BMISS interrupt when we stop seeing beacons from the AP | |
466 | * we've associated with. | |
467 | */ | |
ef4ad633 SM |
468 | static void ath9k_beacon_config_sta(struct ath_softc *sc, |
469 | struct ath_beacon_config *conf) | |
5379c8a2 | 470 | { |
3069168c PR |
471 | struct ath_hw *ah = sc->sc_ah; |
472 | struct ath_common *common = ath9k_hw_common(ah); | |
5379c8a2 S |
473 | struct ath9k_beacon_state bs; |
474 | int dtimperiod, dtimcount, sleepduration; | |
475 | int cfpperiod, cfpcount; | |
476 | u32 nexttbtt = 0, intval, tsftu; | |
477 | u64 tsf; | |
267a9012 | 478 | int num_beacons, offset, dtim_dec_count, cfp_dec_count; |
5379c8a2 | 479 | |
1a20034a | 480 | /* No need to configure beacon if we are not associated */ |
6c43c090 | 481 | if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { |
d2182b69 | 482 | ath_dbg(common, BEACON, |
226afe68 | 483 | "STA is not yet associated..skipping beacon config\n"); |
1a20034a SB |
484 | return; |
485 | } | |
486 | ||
5379c8a2 | 487 | memset(&bs, 0, sizeof(bs)); |
f29f5c08 | 488 | intval = conf->beacon_interval; |
5379c8a2 S |
489 | |
490 | /* | |
491 | * Setup dtim and cfp parameters according to | |
492 | * last beacon we received (which may be none). | |
493 | */ | |
494 | dtimperiod = conf->dtim_period; | |
5379c8a2 S |
495 | dtimcount = conf->dtim_count; |
496 | if (dtimcount >= dtimperiod) /* NB: sanity check */ | |
497 | dtimcount = 0; | |
498 | cfpperiod = 1; /* NB: no PCF support yet */ | |
499 | cfpcount = 0; | |
500 | ||
501 | sleepduration = conf->listen_interval * intval; | |
5379c8a2 S |
502 | |
503 | /* | |
504 | * Pull nexttbtt forward to reflect the current | |
505 | * TSF and calculate dtim+cfp state for the result. | |
506 | */ | |
3069168c | 507 | tsf = ath9k_hw_gettsf64(ah); |
5379c8a2 | 508 | tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; |
267a9012 JM |
509 | |
510 | num_beacons = tsftu / intval + 1; | |
511 | offset = tsftu % intval; | |
512 | nexttbtt = tsftu - offset; | |
513 | if (offset) | |
5379c8a2 | 514 | nexttbtt += intval; |
267a9012 JM |
515 | |
516 | /* DTIM Beacon every dtimperiod Beacon */ | |
517 | dtim_dec_count = num_beacons % dtimperiod; | |
518 | /* CFP every cfpperiod DTIM Beacon */ | |
519 | cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; | |
520 | if (dtim_dec_count) | |
521 | cfp_dec_count++; | |
522 | ||
523 | dtimcount -= dtim_dec_count; | |
524 | if (dtimcount < 0) | |
525 | dtimcount += dtimperiod; | |
526 | ||
527 | cfpcount -= cfp_dec_count; | |
528 | if (cfpcount < 0) | |
529 | cfpcount += cfpperiod; | |
5379c8a2 S |
530 | |
531 | bs.bs_intval = intval; | |
532 | bs.bs_nexttbtt = nexttbtt; | |
533 | bs.bs_dtimperiod = dtimperiod*intval; | |
534 | bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; | |
535 | bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; | |
536 | bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; | |
537 | bs.bs_cfpmaxduration = 0; | |
538 | ||
539 | /* | |
540 | * Calculate the number of consecutive beacons to miss* before taking | |
541 | * a BMISS interrupt. The configuration is specified in TU so we only | |
542 | * need calculate based on the beacon interval. Note that we clamp the | |
543 | * result to at most 15 beacons. | |
544 | */ | |
545 | if (sleepduration > intval) { | |
546 | bs.bs_bmissthreshold = conf->listen_interval * | |
547 | ATH_DEFAULT_BMISS_LIMIT / 2; | |
f078f209 | 548 | } else { |
5379c8a2 S |
549 | bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); |
550 | if (bs.bs_bmissthreshold > 15) | |
551 | bs.bs_bmissthreshold = 15; | |
552 | else if (bs.bs_bmissthreshold <= 0) | |
553 | bs.bs_bmissthreshold = 1; | |
f078f209 LR |
554 | } |
555 | ||
5379c8a2 S |
556 | /* |
557 | * Calculate sleep duration. The configuration is given in ms. | |
558 | * We ensure a multiple of the beacon period is used. Also, if the sleep | |
559 | * duration is greater than the DTIM period then it makes senses | |
560 | * to make it a multiple of that. | |
561 | * | |
562 | * XXX fixed at 100ms | |
563 | */ | |
980b24da | 564 | |
5379c8a2 S |
565 | bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); |
566 | if (bs.bs_sleepduration > bs.bs_dtimperiod) | |
567 | bs.bs_sleepduration = bs.bs_dtimperiod; | |
980b24da | 568 | |
5379c8a2 S |
569 | /* TSF out of range threshold fixed at 1 second */ |
570 | bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; | |
f078f209 | 571 | |
d2182b69 JP |
572 | ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); |
573 | ath_dbg(common, BEACON, | |
226afe68 JP |
574 | "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", |
575 | bs.bs_bmissthreshold, bs.bs_sleepduration, | |
576 | bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); | |
f078f209 | 577 | |
5379c8a2 | 578 | /* Set the computed STA beacon timers */ |
980b24da | 579 | |
4df3071e | 580 | ath9k_hw_disable_interrupts(ah); |
3069168c PR |
581 | ath9k_hw_set_sta_beacon_timers(ah, &bs); |
582 | ah->imask |= ATH9K_INT_BMISS; | |
deb75188 | 583 | |
72d874c6 | 584 | ath9k_hw_set_interrupts(ah); |
e8fe7336 | 585 | ath9k_hw_enable_interrupts(ah); |
5379c8a2 | 586 | } |
f078f209 | 587 | |
ef4ad633 SM |
588 | static void ath9k_beacon_config_adhoc(struct ath_softc *sc, |
589 | struct ath_beacon_config *conf) | |
5379c8a2 | 590 | { |
3069168c PR |
591 | struct ath_hw *ah = sc->sc_ah; |
592 | struct ath_common *common = ath9k_hw_common(ah); | |
ef4ad633 | 593 | u32 intval, nexttbtt; |
dd347f2f | 594 | |
ba4903f9 FF |
595 | ath9k_reset_beacon_status(sc); |
596 | ||
f29f5c08 | 597 | intval = TU_TO_USEC(conf->beacon_interval); |
1a6404a1 SM |
598 | |
599 | if (conf->ibss_creator) { | |
600 | nexttbtt = intval; | |
601 | } else { | |
602 | u32 tbtt, offset, tsftu; | |
603 | u64 tsf; | |
604 | ||
605 | /* | |
606 | * Pull nexttbtt forward to reflect the current | |
607 | * sync'd TSF. | |
608 | */ | |
609 | tsf = ath9k_hw_gettsf64(ah); | |
610 | tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE; | |
611 | offset = tsftu % conf->beacon_interval; | |
612 | tbtt = tsftu - offset; | |
613 | if (offset) | |
614 | tbtt += conf->beacon_interval; | |
615 | ||
616 | nexttbtt = TU_TO_USEC(tbtt); | |
617 | } | |
f078f209 | 618 | |
ef4ad633 SM |
619 | if (conf->enable_beacon) |
620 | ah->imask |= ATH9K_INT_SWBA; | |
621 | else | |
622 | ah->imask &= ~ATH9K_INT_SWBA; | |
9fc9ab0a | 623 | |
1a6404a1 SM |
624 | ath_dbg(common, BEACON, |
625 | "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n", | |
626 | (conf->enable_beacon) ? "Enable" : "Disable", | |
ef4ad633 | 627 | nexttbtt, intval, conf->beacon_interval); |
9fc9ab0a | 628 | |
1a6404a1 SM |
629 | ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator); |
630 | ||
631 | /* | |
632 | * Set the global 'beacon has been configured' flag for the | |
633 | * joiner case in IBSS mode. | |
634 | */ | |
635 | if (!conf->ibss_creator && conf->enable_beacon) | |
636 | set_bit(SC_OP_BEACONS, &sc->sc_flags); | |
f078f209 LR |
637 | } |
638 | ||
ef4ad633 | 639 | bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) |
f078f209 | 640 | { |
c46917bb | 641 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
99e4d43a | 642 | struct ath_vif *avp = (void *)vif->drv_priv; |
5379c8a2 | 643 | |
ef4ad633 SM |
644 | if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { |
645 | if ((vif->type != NL80211_IFTYPE_AP) || | |
646 | (sc->nbcnvifs > 1)) { | |
647 | ath_dbg(common, CONFIG, | |
648 | "An AP interface is already present !\n"); | |
649 | return false; | |
650 | } | |
99e4d43a | 651 | } |
ef4ad633 SM |
652 | |
653 | if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { | |
654 | if ((vif->type == NL80211_IFTYPE_STATION) && | |
655 | test_bit(SC_OP_BEACONS, &sc->sc_flags) && | |
656 | !avp->primary_sta_vif) { | |
657 | ath_dbg(common, CONFIG, | |
658 | "Beacon already configured for a station interface\n"); | |
659 | return false; | |
660 | } | |
ee832d3e | 661 | } |
ef4ad633 | 662 | |
99e4d43a RM |
663 | return true; |
664 | } | |
665 | ||
ef4ad633 SM |
666 | static void ath9k_cache_beacon_config(struct ath_softc *sc, |
667 | struct ieee80211_bss_conf *bss_conf) | |
99e4d43a | 668 | { |
ef4ad633 | 669 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
99e4d43a | 670 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; |
ee832d3e | 671 | |
ef4ad633 SM |
672 | ath_dbg(common, BEACON, |
673 | "Caching beacon data for BSS: %pM\n", bss_conf->bssid); | |
99e4d43a | 674 | |
99e4d43a RM |
675 | cur_conf->beacon_interval = bss_conf->beacon_int; |
676 | cur_conf->dtim_period = bss_conf->dtim_period; | |
4801416c BG |
677 | cur_conf->listen_interval = 1; |
678 | cur_conf->dtim_count = 1; | |
1a6404a1 | 679 | cur_conf->ibss_creator = bss_conf->ibss_creator; |
4801416c BG |
680 | cur_conf->bmiss_timeout = |
681 | ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; | |
6b96f93e | 682 | |
c4f9f16b VT |
683 | /* |
684 | * It looks like mac80211 may end up using beacon interval of zero in | |
685 | * some cases (at least for mesh point). Avoid getting into an | |
686 | * infinite loop by using a bit safer value instead. To be safe, | |
687 | * do sanity check on beacon interval for all operating modes. | |
688 | */ | |
689 | if (cur_conf->beacon_interval == 0) | |
690 | cur_conf->beacon_interval = 100; | |
6b96f93e | 691 | |
ee832d3e | 692 | /* |
3a2329f2 MSS |
693 | * We don't parse dtim period from mac80211 during the driver |
694 | * initialization as it breaks association with hidden-ssid | |
695 | * AP and it causes latency in roaming | |
ee832d3e MSS |
696 | */ |
697 | if (cur_conf->dtim_period == 0) | |
698 | cur_conf->dtim_period = 1; | |
699 | ||
99e4d43a RM |
700 | } |
701 | ||
ef4ad633 SM |
702 | void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, |
703 | u32 changed) | |
8e22ad32 | 704 | { |
ef4ad633 SM |
705 | struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; |
706 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
1a6404a1 SM |
707 | unsigned long flags; |
708 | bool skip_beacon = false; | |
8e22ad32 | 709 | |
ef4ad633 SM |
710 | if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { |
711 | ath9k_cache_beacon_config(sc, bss_conf); | |
712 | ath9k_set_beacon(sc); | |
713 | set_bit(SC_OP_BEACONS, &sc->sc_flags); | |
1a6404a1 SM |
714 | return; |
715 | ||
716 | } | |
717 | ||
718 | /* | |
719 | * Take care of multiple interfaces when | |
720 | * enabling/disabling SWBA. | |
721 | */ | |
722 | if (changed & BSS_CHANGED_BEACON_ENABLED) { | |
723 | if (!bss_conf->enable_beacon && | |
724 | (sc->nbcnvifs <= 1)) { | |
725 | cur_conf->enable_beacon = false; | |
726 | } else if (bss_conf->enable_beacon) { | |
727 | cur_conf->enable_beacon = true; | |
728 | ath9k_cache_beacon_config(sc, bss_conf); | |
8e22ad32 | 729 | } |
1a6404a1 | 730 | } |
ef4ad633 | 731 | |
1a6404a1 SM |
732 | /* |
733 | * Configure the HW beacon registers only when we have a valid | |
734 | * beacon interval. | |
735 | */ | |
736 | if (cur_conf->beacon_interval) { | |
737 | /* | |
738 | * If we are joining an existing IBSS network, start beaconing | |
739 | * only after a TSF-sync has taken place. Ensure that this | |
740 | * happens by setting the appropriate flags. | |
741 | */ | |
742 | if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && | |
743 | bss_conf->enable_beacon) { | |
744 | spin_lock_irqsave(&sc->sc_pm_lock, flags); | |
745 | sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; | |
746 | spin_unlock_irqrestore(&sc->sc_pm_lock, flags); | |
747 | skip_beacon = true; | |
748 | } else { | |
ef4ad633 | 749 | ath9k_set_beacon(sc); |
ef4ad633 | 750 | } |
1a6404a1 SM |
751 | |
752 | /* | |
753 | * Do not set the SC_OP_BEACONS flag for IBSS joiner mode | |
754 | * here, it is done in ath9k_beacon_config_adhoc(). | |
755 | */ | |
756 | if (cur_conf->enable_beacon && !skip_beacon) | |
757 | set_bit(SC_OP_BEACONS, &sc->sc_flags); | |
758 | else | |
759 | clear_bit(SC_OP_BEACONS, &sc->sc_flags); | |
8e22ad32 | 760 | } |
8e22ad32 RM |
761 | } |
762 | ||
ef4ad633 | 763 | void ath9k_set_beacon(struct ath_softc *sc) |
99e4d43a RM |
764 | { |
765 | struct ath_common *common = ath9k_hw_common(sc->sc_ah); | |
766 | struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; | |
767 | ||
26cd322b | 768 | switch (sc->sc_ah->opmode) { |
6b96f93e | 769 | case NL80211_IFTYPE_AP: |
2664d666 | 770 | case NL80211_IFTYPE_MESH_POINT: |
ef4ad633 | 771 | ath9k_beacon_config_ap(sc, cur_conf); |
6b96f93e VT |
772 | break; |
773 | case NL80211_IFTYPE_ADHOC: | |
ef4ad633 | 774 | ath9k_beacon_config_adhoc(sc, cur_conf); |
6b96f93e VT |
775 | break; |
776 | case NL80211_IFTYPE_STATION: | |
ef4ad633 | 777 | ath9k_beacon_config_sta(sc, cur_conf); |
6b96f93e VT |
778 | break; |
779 | default: | |
d2182b69 | 780 | ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); |
6b96f93e VT |
781 | return; |
782 | } | |
014cf3bb | 783 | } |