Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008 Atheros Communications Inc. |
| 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 | |
| 17 | /* Implementation of beacon processing. */ |
| 18 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 19 | #include "core.h" |
| 20 | |
| 21 | /* |
| 22 | * Configure parameters for the beacon queue |
| 23 | * |
| 24 | * This function will modify certain transmit queue properties depending on |
| 25 | * the operating mode of the station (AP or AdHoc). Parameters are AIFS |
| 26 | * settings and channel width min/max |
| 27 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 28 | static int ath_beaconq_config(struct ath_softc *sc) |
| 29 | { |
| 30 | struct ath_hal *ah = sc->sc_ah; |
Sujith | ea9880f | 2008-08-07 10:53:10 +0530 | [diff] [blame] | 31 | struct ath9k_tx_queue_info qi; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 32 | |
Sujith | ea9880f | 2008-08-07 10:53:10 +0530 | [diff] [blame] | 33 | ath9k_hw_get_txq_props(ah, sc->sc_bhalq, &qi); |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 34 | if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 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. */ |
| 41 | qi.tqi_aifs = sc->sc_beacon_qi.tqi_aifs; |
| 42 | qi.tqi_cwmin = 2*sc->sc_beacon_qi.tqi_cwmin; |
| 43 | qi.tqi_cwmax = sc->sc_beacon_qi.tqi_cwmax; |
| 44 | } |
| 45 | |
Sujith | ea9880f | 2008-08-07 10:53:10 +0530 | [diff] [blame] | 46 | if (!ath9k_hw_set_txq_props(ah, sc->sc_bhalq, &qi)) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 47 | DPRINTF(sc, ATH_DBG_FATAL, |
| 48 | "%s: unable to update h/w beacon queue parameters\n", |
| 49 | __func__); |
| 50 | return 0; |
| 51 | } else { |
| 52 | ath9k_hw_resettxqueue(ah, sc->sc_bhalq); /* push to h/w */ |
| 53 | return 1; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Setup the beacon frame for transmit. |
| 59 | * |
| 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 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 64 | static void ath_beacon_setup(struct ath_softc *sc, |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 65 | struct ath_vap *avp, struct ath_buf *bf) |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 66 | { |
| 67 | struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu; |
| 68 | struct ath_hal *ah = sc->sc_ah; |
| 69 | struct ath_desc *ds; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 70 | struct ath9k_11n_rate_series series[4]; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 71 | const struct ath9k_rate_table *rt; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 72 | int flags, antenna; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 73 | u8 rix, rate; |
| 74 | int ctsrate = 0; |
| 75 | int ctsduration = 0; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 76 | |
| 77 | DPRINTF(sc, ATH_DBG_BEACON, "%s: m %p len %u\n", |
| 78 | __func__, skb, skb->len); |
| 79 | |
| 80 | /* setup descriptors */ |
| 81 | ds = bf->bf_desc; |
| 82 | |
| 83 | flags = ATH9K_TXDESC_NOACK; |
| 84 | |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 85 | if (sc->sc_ah->ah_opmode == ATH9K_M_IBSS && |
Sujith | 60b67f5 | 2008-08-07 10:52:38 +0530 | [diff] [blame] | 86 | (ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL)) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 87 | ds->ds_link = bf->bf_daddr; /* self-linked */ |
| 88 | flags |= ATH9K_TXDESC_VEOL; |
| 89 | /* Let hardware handle antenna switching. */ |
| 90 | antenna = 0; |
| 91 | } else { |
| 92 | ds->ds_link = 0; |
| 93 | /* |
| 94 | * Switch antenna every beacon. |
| 95 | * Should only switch every beacon period, not for every |
| 96 | * SWBA's |
| 97 | * XXX assumes two antenna |
| 98 | */ |
| 99 | antenna = ((sc->ast_be_xmit / sc->sc_nbcnvaps) & 1 ? 2 : 1); |
| 100 | } |
| 101 | |
| 102 | ds->ds_data = bf->bf_buf_addr; |
| 103 | |
| 104 | /* |
| 105 | * Calculate rate code. |
| 106 | * XXX everything at min xmit rate |
| 107 | */ |
Sujith | 86b89ee | 2008-08-07 10:54:57 +0530 | [diff] [blame] | 108 | rix = 0; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 109 | rt = sc->sc_currates; |
| 110 | rate = rt->info[rix].rateCode; |
Sujith | 672840a | 2008-08-11 14:05:08 +0530 | [diff] [blame] | 111 | if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 112 | rate |= rt->info[rix].shortPreamble; |
| 113 | |
Sujith | ff9b662 | 2008-08-14 13:27:16 +0530 | [diff] [blame] | 114 | ath9k_hw_set11n_txdesc(ah, ds, |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 115 | skb->len + FCS_LEN, /* frame length */ |
| 116 | ATH9K_PKT_TYPE_BEACON, /* Atheros packet type */ |
Sujith | ff9b662 | 2008-08-14 13:27:16 +0530 | [diff] [blame] | 117 | avp->av_btxctl.txpower, /* txpower XXX */ |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 118 | ATH9K_TXKEYIX_INVALID, /* no encryption */ |
| 119 | ATH9K_KEY_TYPE_CLEAR, /* no encryption */ |
| 120 | flags /* no ack, |
| 121 | veol for beacons */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 122 | ); |
| 123 | |
| 124 | /* NB: beacon's BufLen must be a multiple of 4 bytes */ |
Sujith | ff9b662 | 2008-08-14 13:27:16 +0530 | [diff] [blame] | 125 | ath9k_hw_filltxdesc(ah, ds, |
| 126 | roundup(skb->len, 4), /* buffer length */ |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 127 | true, /* first segment */ |
| 128 | true, /* last segment */ |
| 129 | ds /* first descriptor */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 130 | ); |
| 131 | |
Luis R. Rodriguez | 0345f37 | 2008-10-03 15:45:25 -0700 | [diff] [blame] | 132 | memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 133 | series[0].Tries = 1; |
| 134 | series[0].Rate = rate; |
| 135 | series[0].ChSel = sc->sc_tx_chainmask; |
| 136 | series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0; |
| 137 | ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, |
| 138 | ctsrate, ctsduration, series, 4, 0); |
| 139 | } |
| 140 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 141 | /* |
| 142 | * Generate beacon frame and queue cab data for a vap. |
| 143 | * |
| 144 | * Updates the contents of the beacon frame. It is assumed that the buffer for |
| 145 | * the beacon frame has been allocated in the ATH object, and simply needs to |
| 146 | * be filled for this cycle. Also, any CAB (crap after beacon?) traffic will |
| 147 | * be added to the beacon frame at this point. |
| 148 | */ |
| 149 | static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id) |
| 150 | { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 151 | struct ath_buf *bf; |
| 152 | struct ath_vap *avp; |
| 153 | struct sk_buff *skb; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 154 | struct ath_txq *cabq; |
Jouni Malinen | 147583c | 2008-08-11 14:01:50 +0300 | [diff] [blame] | 155 | struct ieee80211_tx_info *info; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 156 | int cabq_depth; |
| 157 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 158 | avp = sc->sc_vaps[if_id]; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 159 | ASSERT(avp); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 160 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 161 | cabq = sc->sc_cabq; |
| 162 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 163 | if (avp->av_bcbuf == NULL) { |
| 164 | DPRINTF(sc, ATH_DBG_BEACON, "%s: avp=%p av_bcbuf=%p\n", |
| 165 | __func__, avp, avp->av_bcbuf); |
| 166 | return NULL; |
| 167 | } |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 168 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 169 | bf = avp->av_bcbuf; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 170 | skb = (struct sk_buff *)bf->bf_mpdu; |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 171 | if (skb) { |
| 172 | pci_unmap_single(sc->pdev, bf->bf_dmacontext, |
Luis R. Rodriguez | ca0c7e5 | 2008-11-20 17:15:12 -0800 | [diff] [blame] | 173 | skb->len, |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 174 | PCI_DMA_TODEVICE); |
| 175 | } |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 176 | |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 177 | skb = ieee80211_beacon_get(sc->hw, avp->av_if_data); |
| 178 | bf->bf_mpdu = skb; |
| 179 | if (skb == NULL) |
| 180 | return NULL; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 181 | |
Jouni Malinen | 147583c | 2008-08-11 14:01:50 +0300 | [diff] [blame] | 182 | info = IEEE80211_SKB_CB(skb); |
| 183 | if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { |
| 184 | /* |
| 185 | * TODO: make sure the seq# gets assigned properly (vs. other |
| 186 | * TX frames) |
| 187 | */ |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 188 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Jouni Malinen | 147583c | 2008-08-11 14:01:50 +0300 | [diff] [blame] | 189 | sc->seq_no += 0x10; |
| 190 | hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); |
| 191 | hdr->seq_ctrl |= cpu_to_le16(sc->seq_no); |
| 192 | } |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 193 | |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 194 | bf->bf_buf_addr = bf->bf_dmacontext = |
| 195 | pci_map_single(sc->pdev, skb->data, |
Luis R. Rodriguez | ca0c7e5 | 2008-11-20 17:15:12 -0800 | [diff] [blame] | 196 | skb->len, |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 197 | PCI_DMA_TODEVICE); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 198 | |
Jouni Malinen | e022edb | 2008-08-22 17:31:33 +0300 | [diff] [blame] | 199 | skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 200 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 201 | /* |
| 202 | * if the CABQ traffic from previous DTIM is pending and the current |
| 203 | * beacon is also a DTIM. |
| 204 | * 1) if there is only one vap let the cab traffic continue. |
| 205 | * 2) if there are more than one vap and we are using staggered |
| 206 | * beacons, then drain the cabq by dropping all the frames in |
| 207 | * the cabq so that the current vaps cab traffic can be scheduled. |
| 208 | */ |
| 209 | spin_lock_bh(&cabq->axq_lock); |
| 210 | cabq_depth = cabq->axq_depth; |
| 211 | spin_unlock_bh(&cabq->axq_lock); |
| 212 | |
Jouni Malinen | e022edb | 2008-08-22 17:31:33 +0300 | [diff] [blame] | 213 | if (skb && cabq_depth) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 214 | /* |
| 215 | * Unlock the cabq lock as ath_tx_draintxq acquires |
| 216 | * the lock again which is a common function and that |
| 217 | * acquires txq lock inside. |
| 218 | */ |
| 219 | if (sc->sc_nvaps > 1) { |
| 220 | ath_tx_draintxq(sc, cabq, false); |
| 221 | DPRINTF(sc, ATH_DBG_BEACON, |
| 222 | "%s: flush previous cabq traffic\n", __func__); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | /* Construct tx descriptor. */ |
| 227 | ath_beacon_setup(sc, avp, bf); |
| 228 | |
| 229 | /* |
| 230 | * Enable the CAB queue before the beacon queue to |
| 231 | * insure cab frames are triggered by this beacon. |
| 232 | */ |
Jouni Malinen | e022edb | 2008-08-22 17:31:33 +0300 | [diff] [blame] | 233 | while (skb) { |
| 234 | ath_tx_cabq(sc, skb); |
| 235 | skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data); |
| 236 | } |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 237 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 238 | return bf; |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * Startup beacon transmission for adhoc mode when they are sent entirely |
| 243 | * by the hardware using the self-linked descriptor + veol trick. |
| 244 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 245 | static void ath_beacon_start_adhoc(struct ath_softc *sc, int if_id) |
| 246 | { |
| 247 | struct ath_hal *ah = sc->sc_ah; |
| 248 | struct ath_buf *bf; |
| 249 | struct ath_vap *avp; |
| 250 | struct sk_buff *skb; |
| 251 | |
| 252 | avp = sc->sc_vaps[if_id]; |
| 253 | ASSERT(avp); |
| 254 | |
| 255 | if (avp->av_bcbuf == NULL) { |
| 256 | DPRINTF(sc, ATH_DBG_BEACON, "%s: avp=%p av_bcbuf=%p\n", |
| 257 | __func__, avp, avp != NULL ? avp->av_bcbuf : NULL); |
| 258 | return; |
| 259 | } |
| 260 | bf = avp->av_bcbuf; |
| 261 | skb = (struct sk_buff *) bf->bf_mpdu; |
| 262 | |
| 263 | /* Construct tx descriptor. */ |
| 264 | ath_beacon_setup(sc, avp, bf); |
| 265 | |
| 266 | /* NB: caller is known to have already stopped tx dma */ |
| 267 | ath9k_hw_puttxbuf(ah, sc->sc_bhalq, bf->bf_daddr); |
| 268 | ath9k_hw_txstart(ah, sc->sc_bhalq); |
| 269 | DPRINTF(sc, ATH_DBG_BEACON, "%s: TXDP%u = %llx (%p)\n", __func__, |
| 270 | sc->sc_bhalq, ito64(bf->bf_daddr), bf->bf_desc); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Setup a h/w transmit queue for beacons. |
| 275 | * |
| 276 | * This function allocates an information structure (struct ath9k_txq_info) |
| 277 | * on the stack, sets some specific parameters (zero out channel width |
| 278 | * min/max, and enable aifs). The info structure does not need to be |
| 279 | * persistant. |
| 280 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 281 | int ath_beaconq_setup(struct ath_hal *ah) |
| 282 | { |
Sujith | ea9880f | 2008-08-07 10:53:10 +0530 | [diff] [blame] | 283 | struct ath9k_tx_queue_info qi; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 284 | |
Luis R. Rodriguez | 0345f37 | 2008-10-03 15:45:25 -0700 | [diff] [blame] | 285 | memset(&qi, 0, sizeof(qi)); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 286 | qi.tqi_aifs = 1; |
| 287 | qi.tqi_cwmin = 0; |
| 288 | qi.tqi_cwmax = 0; |
| 289 | /* NB: don't enable any interrupts */ |
| 290 | return ath9k_hw_setuptxqueue(ah, ATH9K_TX_QUEUE_BEACON, &qi); |
| 291 | } |
| 292 | |
| 293 | |
| 294 | /* |
| 295 | * Allocate and setup an initial beacon frame. |
| 296 | * |
| 297 | * Allocate a beacon state variable for a specific VAP instance created on |
| 298 | * the ATH interface. This routine also calculates the beacon "slot" for |
| 299 | * staggared beacons in the mBSSID case. |
| 300 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 301 | int ath_beacon_alloc(struct ath_softc *sc, int if_id) |
| 302 | { |
| 303 | struct ath_vap *avp; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 304 | struct ieee80211_hdr *hdr; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 305 | struct ath_buf *bf; |
| 306 | struct sk_buff *skb; |
Sujith | 459f5f9 | 2008-09-17 10:15:36 +0530 | [diff] [blame] | 307 | __le64 tstamp; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 308 | |
| 309 | avp = sc->sc_vaps[if_id]; |
| 310 | ASSERT(avp); |
| 311 | |
| 312 | /* Allocate a beacon descriptor if we haven't done so. */ |
| 313 | if (!avp->av_bcbuf) { |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 314 | /* Allocate beacon state for hostap/ibss. We know |
| 315 | * a buffer is available. */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 316 | |
| 317 | avp->av_bcbuf = list_first_entry(&sc->sc_bbuf, |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 318 | struct ath_buf, list); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 319 | list_del(&avp->av_bcbuf->list); |
| 320 | |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 321 | if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP || |
Sujith | 60b67f5 | 2008-08-07 10:52:38 +0530 | [diff] [blame] | 322 | !(sc->sc_ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL)) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 323 | int slot; |
| 324 | /* |
| 325 | * Assign the vap to a beacon xmit slot. As |
| 326 | * above, this cannot fail to find one. |
| 327 | */ |
| 328 | avp->av_bslot = 0; |
| 329 | for (slot = 0; slot < ATH_BCBUF; slot++) |
| 330 | if (sc->sc_bslot[slot] == ATH_IF_ID_ANY) { |
| 331 | /* |
| 332 | * XXX hack, space out slots to better |
| 333 | * deal with misses |
| 334 | */ |
| 335 | if (slot+1 < ATH_BCBUF && |
| 336 | sc->sc_bslot[slot+1] == |
| 337 | ATH_IF_ID_ANY) { |
| 338 | avp->av_bslot = slot+1; |
| 339 | break; |
| 340 | } |
| 341 | avp->av_bslot = slot; |
| 342 | /* NB: keep looking for a double slot */ |
| 343 | } |
| 344 | BUG_ON(sc->sc_bslot[avp->av_bslot] != ATH_IF_ID_ANY); |
| 345 | sc->sc_bslot[avp->av_bslot] = if_id; |
| 346 | sc->sc_nbcnvaps++; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | /* release the previous beacon frame , if it already exists. */ |
| 351 | bf = avp->av_bcbuf; |
| 352 | if (bf->bf_mpdu != NULL) { |
| 353 | skb = (struct sk_buff *)bf->bf_mpdu; |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 354 | pci_unmap_single(sc->pdev, bf->bf_dmacontext, |
Luis R. Rodriguez | ca0c7e5 | 2008-11-20 17:15:12 -0800 | [diff] [blame] | 355 | skb->len, |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 356 | PCI_DMA_TODEVICE); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 357 | dev_kfree_skb_any(skb); |
| 358 | bf->bf_mpdu = NULL; |
| 359 | } |
| 360 | |
| 361 | /* |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 362 | * NB: the beacon data buffer must be 32-bit aligned. |
Jouni Malinen | e022edb | 2008-08-22 17:31:33 +0300 | [diff] [blame] | 363 | * FIXME: Fill avp->av_btxctl.txpower and |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 364 | * avp->av_btxctl.shortPreamble |
| 365 | */ |
| 366 | skb = ieee80211_beacon_get(sc->hw, avp->av_if_data); |
| 367 | if (skb == NULL) { |
| 368 | DPRINTF(sc, ATH_DBG_BEACON, "%s: cannot get skb\n", |
| 369 | __func__); |
| 370 | return -ENOMEM; |
| 371 | } |
| 372 | |
Sujith | 459f5f9 | 2008-09-17 10:15:36 +0530 | [diff] [blame] | 373 | tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; |
| 374 | sc->bc_tstamp = le64_to_cpu(tstamp); |
| 375 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 376 | /* |
| 377 | * Calculate a TSF adjustment factor required for |
| 378 | * staggered beacons. Note that we assume the format |
| 379 | * of the beacon frame leaves the tstamp field immediately |
| 380 | * following the header. |
| 381 | */ |
| 382 | if (avp->av_bslot > 0) { |
| 383 | u64 tsfadjust; |
| 384 | __le64 val; |
| 385 | int intval; |
| 386 | |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 387 | intval = sc->hw->conf.beacon_int ? |
| 388 | sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 389 | |
| 390 | /* |
| 391 | * The beacon interval is in TU's; the TSF in usecs. |
| 392 | * We figure out how many TU's to add to align the |
| 393 | * timestamp then convert to TSF units and handle |
| 394 | * byte swapping before writing it in the frame. |
| 395 | * The hardware will then add this each time a beacon |
| 396 | * frame is sent. Note that we align vap's 1..N |
| 397 | * and leave vap 0 untouched. This means vap 0 |
| 398 | * has a timestamp in one beacon interval while the |
| 399 | * others get a timestamp aligned to the next interval. |
| 400 | */ |
| 401 | tsfadjust = (intval * (ATH_BCBUF - avp->av_bslot)) / ATH_BCBUF; |
| 402 | val = cpu_to_le64(tsfadjust << 10); /* TU->TSF */ |
| 403 | |
| 404 | DPRINTF(sc, ATH_DBG_BEACON, |
| 405 | "%s: %s beacons, bslot %d intval %u tsfadjust %llu\n", |
| 406 | __func__, "stagger", |
| 407 | avp->av_bslot, intval, (unsigned long long)tsfadjust); |
| 408 | |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 409 | hdr = (struct ieee80211_hdr *)skb->data; |
| 410 | memcpy(&hdr[1], &val, sizeof(val)); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 411 | } |
| 412 | |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 413 | bf->bf_buf_addr = bf->bf_dmacontext = |
| 414 | pci_map_single(sc->pdev, skb->data, |
Luis R. Rodriguez | ca0c7e5 | 2008-11-20 17:15:12 -0800 | [diff] [blame] | 415 | skb->len, |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 416 | PCI_DMA_TODEVICE); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 417 | bf->bf_mpdu = skb; |
| 418 | |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | /* |
| 423 | * Reclaim beacon resources and return buffer to the pool. |
| 424 | * |
| 425 | * Checks the VAP to put the beacon frame buffer back to the ATH object |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 426 | * queue, and de-allocates any skbs that were sent as CAB traffic. |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 427 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 428 | void ath_beacon_return(struct ath_softc *sc, struct ath_vap *avp) |
| 429 | { |
| 430 | if (avp->av_bcbuf != NULL) { |
| 431 | struct ath_buf *bf; |
| 432 | |
| 433 | if (avp->av_bslot != -1) { |
| 434 | sc->sc_bslot[avp->av_bslot] = ATH_IF_ID_ANY; |
| 435 | sc->sc_nbcnvaps--; |
| 436 | } |
| 437 | |
| 438 | bf = avp->av_bcbuf; |
| 439 | if (bf->bf_mpdu != NULL) { |
| 440 | struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu; |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 441 | pci_unmap_single(sc->pdev, bf->bf_dmacontext, |
Luis R. Rodriguez | ca0c7e5 | 2008-11-20 17:15:12 -0800 | [diff] [blame] | 442 | skb->len, |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 443 | PCI_DMA_TODEVICE); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 444 | dev_kfree_skb_any(skb); |
| 445 | bf->bf_mpdu = NULL; |
| 446 | } |
| 447 | list_add_tail(&bf->list, &sc->sc_bbuf); |
| 448 | |
| 449 | avp->av_bcbuf = NULL; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 454 | * Tasklet for Sending Beacons |
| 455 | * |
| 456 | * Transmit one or more beacon frames at SWBA. Dynamic updates to the frame |
| 457 | * contents are done as needed and the slot time is also adjusted based on |
| 458 | * current state. |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 459 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 460 | void ath9k_beacon_tasklet(unsigned long data) |
| 461 | { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 462 | struct ath_softc *sc = (struct ath_softc *)data; |
| 463 | struct ath_hal *ah = sc->sc_ah; |
| 464 | struct ath_buf *bf = NULL; |
| 465 | int slot, if_id; |
| 466 | u32 bfaddr; |
| 467 | u32 rx_clear = 0, rx_frame = 0, tx_frame = 0; |
| 468 | u32 show_cycles = 0; |
| 469 | u32 bc = 0; /* beacon count */ |
| 470 | u64 tsf; |
| 471 | u32 tsftu; |
| 472 | u16 intval; |
| 473 | |
Sujith | 98deeea | 2008-08-11 14:05:46 +0530 | [diff] [blame] | 474 | if (sc->sc_flags & SC_OP_NO_RESET) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 475 | show_cycles = ath9k_hw_GetMibCycleCountsPct(ah, |
| 476 | &rx_clear, |
| 477 | &rx_frame, |
| 478 | &tx_frame); |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * Check if the previous beacon has gone out. If |
| 483 | * not don't try to post another, skip this period |
| 484 | * and wait for the next. Missed beacons indicate |
| 485 | * a problem and should not occur. If we miss too |
| 486 | * many consecutive beacons reset the device. |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 487 | * |
| 488 | * FIXME: Clean up this mess !! |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 489 | */ |
| 490 | if (ath9k_hw_numtxpending(ah, sc->sc_bhalq) != 0) { |
| 491 | sc->sc_bmisscount++; |
| 492 | /* XXX: doth needs the chanchange IE countdown decremented. |
| 493 | * We should consider adding a mac80211 call to indicate |
| 494 | * a beacon miss so appropriate action could be taken |
| 495 | * (in that layer). |
| 496 | */ |
| 497 | if (sc->sc_bmisscount < BSTUCK_THRESH) { |
Sujith | 98deeea | 2008-08-11 14:05:46 +0530 | [diff] [blame] | 498 | if (sc->sc_flags & SC_OP_NO_RESET) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 499 | DPRINTF(sc, ATH_DBG_BEACON, |
| 500 | "%s: missed %u consecutive beacons\n", |
| 501 | __func__, sc->sc_bmisscount); |
| 502 | if (show_cycles) { |
| 503 | /* |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 504 | * Display cycle counter stats from HW |
| 505 | * to aide in debug of stickiness. |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 506 | */ |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 507 | DPRINTF(sc, ATH_DBG_BEACON, |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 508 | "%s: busy times: rx_clear=%d, " |
| 509 | "rx_frame=%d, tx_frame=%d\n", |
| 510 | __func__, rx_clear, rx_frame, |
| 511 | tx_frame); |
| 512 | } else { |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 513 | DPRINTF(sc, ATH_DBG_BEACON, |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 514 | "%s: unable to obtain " |
| 515 | "busy times\n", __func__); |
| 516 | } |
| 517 | } else { |
| 518 | DPRINTF(sc, ATH_DBG_BEACON, |
| 519 | "%s: missed %u consecutive beacons\n", |
| 520 | __func__, sc->sc_bmisscount); |
| 521 | } |
| 522 | } else if (sc->sc_bmisscount >= BSTUCK_THRESH) { |
Sujith | 98deeea | 2008-08-11 14:05:46 +0530 | [diff] [blame] | 523 | if (sc->sc_flags & SC_OP_NO_RESET) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 524 | if (sc->sc_bmisscount == BSTUCK_THRESH) { |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 525 | DPRINTF(sc, ATH_DBG_BEACON, |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 526 | "%s: beacon is officially " |
| 527 | "stuck\n", __func__); |
| 528 | ath9k_hw_dmaRegDump(ah); |
| 529 | } |
| 530 | } else { |
| 531 | DPRINTF(sc, ATH_DBG_BEACON, |
| 532 | "%s: beacon is officially stuck\n", |
| 533 | __func__); |
| 534 | ath_bstuck_process(sc); |
| 535 | } |
| 536 | } |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 537 | return; |
| 538 | } |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 539 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 540 | if (sc->sc_bmisscount != 0) { |
Sujith | 98deeea | 2008-08-11 14:05:46 +0530 | [diff] [blame] | 541 | if (sc->sc_flags & SC_OP_NO_RESET) { |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 542 | DPRINTF(sc, ATH_DBG_BEACON, |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 543 | "%s: resume beacon xmit after %u misses\n", |
| 544 | __func__, sc->sc_bmisscount); |
| 545 | } else { |
| 546 | DPRINTF(sc, ATH_DBG_BEACON, |
| 547 | "%s: resume beacon xmit after %u misses\n", |
| 548 | __func__, sc->sc_bmisscount); |
| 549 | } |
| 550 | sc->sc_bmisscount = 0; |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Generate beacon frames. we are sending frames |
| 555 | * staggered so calculate the slot for this frame based |
| 556 | * on the tsf to safeguard against missing an swba. |
| 557 | */ |
| 558 | |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 559 | intval = sc->hw->conf.beacon_int ? |
| 560 | sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 561 | |
| 562 | tsf = ath9k_hw_gettsf64(ah); |
| 563 | tsftu = TSF_TO_TU(tsf>>32, tsf); |
| 564 | slot = ((tsftu % intval) * ATH_BCBUF) / intval; |
| 565 | if_id = sc->sc_bslot[(slot + 1) % ATH_BCBUF]; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 566 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 567 | DPRINTF(sc, ATH_DBG_BEACON, |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 568 | "%s: slot %d [tsf %llu tsftu %u intval %u] if_id %d\n", |
| 569 | __func__, slot, (unsigned long long)tsf, tsftu, |
| 570 | intval, if_id); |
| 571 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 572 | bfaddr = 0; |
| 573 | if (if_id != ATH_IF_ID_ANY) { |
| 574 | bf = ath_beacon_generate(sc, if_id); |
| 575 | if (bf != NULL) { |
| 576 | bfaddr = bf->bf_daddr; |
| 577 | bc = 1; |
| 578 | } |
| 579 | } |
| 580 | /* |
| 581 | * Handle slot time change when a non-ERP station joins/leaves |
| 582 | * an 11g network. The 802.11 layer notifies us via callback, |
| 583 | * we mark updateslot, then wait one beacon before effecting |
| 584 | * the change. This gives associated stations at least one |
| 585 | * beacon interval to note the state change. |
| 586 | * |
| 587 | * NB: The slot time change state machine is clocked according |
| 588 | * to whether we are bursting or staggering beacons. We |
| 589 | * recognize the request to update and record the current |
| 590 | * slot then don't transition until that slot is reached |
| 591 | * again. If we miss a beacon for that slot then we'll be |
| 592 | * slow to transition but we'll be sure at least one beacon |
| 593 | * interval has passed. When bursting slot is always left |
| 594 | * set to ATH_BCBUF so this check is a noop. |
| 595 | */ |
| 596 | /* XXX locking */ |
| 597 | if (sc->sc_updateslot == UPDATE) { |
| 598 | sc->sc_updateslot = COMMIT; /* commit next beacon */ |
| 599 | sc->sc_slotupdate = slot; |
| 600 | } else if (sc->sc_updateslot == COMMIT && sc->sc_slotupdate == slot) |
| 601 | ath_setslottime(sc); /* commit change to hardware */ |
| 602 | |
| 603 | if (bfaddr != 0) { |
| 604 | /* |
| 605 | * Stop any current dma and put the new frame(s) on the queue. |
| 606 | * This should never fail since we check above that no frames |
| 607 | * are still pending on the queue. |
| 608 | */ |
| 609 | if (!ath9k_hw_stoptxdma(ah, sc->sc_bhalq)) { |
| 610 | DPRINTF(sc, ATH_DBG_FATAL, |
| 611 | "%s: beacon queue %u did not stop?\n", |
| 612 | __func__, sc->sc_bhalq); |
| 613 | /* NB: the HAL still stops DMA, so proceed */ |
| 614 | } |
| 615 | |
| 616 | /* NB: cabq traffic should already be queued and primed */ |
| 617 | ath9k_hw_puttxbuf(ah, sc->sc_bhalq, bfaddr); |
| 618 | ath9k_hw_txstart(ah, sc->sc_bhalq); |
| 619 | |
| 620 | sc->ast_be_xmit += bc; /* XXX per-vap? */ |
| 621 | } |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | /* |
| 625 | * Tasklet for Beacon Stuck processing |
| 626 | * |
| 627 | * Processing for Beacon Stuck. |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 628 | * Basically resets the chip. |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 629 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 630 | void ath_bstuck_process(struct ath_softc *sc) |
| 631 | { |
| 632 | DPRINTF(sc, ATH_DBG_BEACON, |
| 633 | "%s: stuck beacon; resetting (bmiss count %u)\n", |
| 634 | __func__, sc->sc_bmisscount); |
Sujith | f45144e | 2008-08-11 14:02:53 +0530 | [diff] [blame] | 635 | ath_reset(sc, false); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 636 | } |
| 637 | |
| 638 | /* |
| 639 | * Configure the beacon and sleep timers. |
| 640 | * |
| 641 | * When operating as an AP this resets the TSF and sets |
| 642 | * up the hardware to notify us when we need to issue beacons. |
| 643 | * |
| 644 | * When operating in station mode this sets up the beacon |
| 645 | * timers according to the timestamp of the last received |
| 646 | * beacon and the current TSF, configures PCF and DTIM |
| 647 | * handling, programs the sleep registers so the hardware |
| 648 | * will wakeup in time to receive beacons, and configures |
| 649 | * the beacon miss handling so we'll receive a BMISS |
| 650 | * interrupt when we stop seeing beacons from the AP |
| 651 | * we've associated with. |
| 652 | */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 653 | void ath_beacon_config(struct ath_softc *sc, int if_id) |
| 654 | { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 655 | struct ath_hal *ah = sc->sc_ah; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 656 | struct ath_beacon_config conf; |
| 657 | enum ath9k_opmode av_opmode; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 658 | u32 nexttbtt, intval; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 659 | |
| 660 | if (if_id != ATH_IF_ID_ANY) |
| 661 | av_opmode = sc->sc_vaps[if_id]->av_opmode; |
| 662 | else |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 663 | av_opmode = sc->sc_ah->ah_opmode; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 664 | |
Luis R. Rodriguez | 0345f37 | 2008-10-03 15:45:25 -0700 | [diff] [blame] | 665 | memset(&conf, 0, sizeof(struct ath_beacon_config)); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 666 | |
Jouni Malinen | a8fff50 | 2008-08-11 14:01:48 +0300 | [diff] [blame] | 667 | conf.beacon_interval = sc->hw->conf.beacon_int ? |
| 668 | sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 669 | conf.listen_interval = 1; |
| 670 | conf.dtim_period = conf.beacon_interval; |
| 671 | conf.dtim_count = 1; |
| 672 | conf.bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf.beacon_interval; |
| 673 | |
| 674 | /* extract tstamp from last beacon and convert to TU */ |
Sujith | 459f5f9 | 2008-09-17 10:15:36 +0530 | [diff] [blame] | 675 | nexttbtt = TSF_TO_TU(sc->bc_tstamp >> 32, sc->bc_tstamp); |
| 676 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 677 | /* XXX conditionalize multi-bss support? */ |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 678 | if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 679 | /* |
| 680 | * For multi-bss ap support beacons are either staggered |
| 681 | * evenly over N slots or burst together. For the former |
| 682 | * arrange for the SWBA to be delivered for each slot. |
| 683 | * Slots that are not occupied will generate nothing. |
| 684 | */ |
| 685 | /* NB: the beacon interval is kept internally in TU's */ |
| 686 | intval = conf.beacon_interval & ATH9K_BEACON_PERIOD; |
| 687 | intval /= ATH_BCBUF; /* for staggered beacons */ |
| 688 | } else { |
| 689 | intval = conf.beacon_interval & ATH9K_BEACON_PERIOD; |
| 690 | } |
| 691 | |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 692 | if (nexttbtt == 0) /* e.g. for ap mode */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 693 | nexttbtt = intval; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 694 | else if (intval) /* NB: can be 0 for monitor mode */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 695 | nexttbtt = roundup(nexttbtt, intval); |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 696 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 697 | DPRINTF(sc, ATH_DBG_BEACON, "%s: nexttbtt %u intval %u (%u)\n", |
| 698 | __func__, nexttbtt, intval, conf.beacon_interval); |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 699 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 700 | /* Check for ATH9K_M_HOSTAP and sc_nostabeacons for WDS client */ |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 701 | if (sc->sc_ah->ah_opmode == ATH9K_M_STA) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 702 | struct ath9k_beacon_state bs; |
| 703 | u64 tsf; |
| 704 | u32 tsftu; |
| 705 | int dtimperiod, dtimcount, sleepduration; |
| 706 | int cfpperiod, cfpcount; |
| 707 | |
| 708 | /* |
| 709 | * Setup dtim and cfp parameters according to |
| 710 | * last beacon we received (which may be none). |
| 711 | */ |
| 712 | dtimperiod = conf.dtim_period; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 713 | if (dtimperiod <= 0) /* NB: 0 if not known */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 714 | dtimperiod = 1; |
| 715 | dtimcount = conf.dtim_count; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 716 | if (dtimcount >= dtimperiod) /* NB: sanity check */ |
| 717 | dtimcount = 0; |
| 718 | cfpperiod = 1; /* NB: no PCF support yet */ |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 719 | cfpcount = 0; |
| 720 | |
| 721 | sleepduration = conf.listen_interval * intval; |
| 722 | if (sleepduration <= 0) |
| 723 | sleepduration = intval; |
| 724 | |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 725 | #define FUDGE 2 |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 726 | /* |
| 727 | * Pull nexttbtt forward to reflect the current |
| 728 | * TSF and calculate dtim+cfp state for the result. |
| 729 | */ |
| 730 | tsf = ath9k_hw_gettsf64(ah); |
| 731 | tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; |
| 732 | do { |
| 733 | nexttbtt += intval; |
| 734 | if (--dtimcount < 0) { |
| 735 | dtimcount = dtimperiod - 1; |
| 736 | if (--cfpcount < 0) |
| 737 | cfpcount = cfpperiod - 1; |
| 738 | } |
| 739 | } while (nexttbtt < tsftu); |
| 740 | #undef FUDGE |
Luis R. Rodriguez | 0345f37 | 2008-10-03 15:45:25 -0700 | [diff] [blame] | 741 | memset(&bs, 0, sizeof(bs)); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 742 | bs.bs_intval = intval; |
| 743 | bs.bs_nexttbtt = nexttbtt; |
| 744 | bs.bs_dtimperiod = dtimperiod*intval; |
| 745 | bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; |
| 746 | bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; |
| 747 | bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; |
| 748 | bs.bs_cfpmaxduration = 0; |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 749 | |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 750 | /* |
| 751 | * Calculate the number of consecutive beacons to miss |
| 752 | * before taking a BMISS interrupt. The configuration |
| 753 | * is specified in TU so we only need calculate based |
| 754 | * on the beacon interval. Note that we clamp the |
| 755 | * result to at most 15 beacons. |
| 756 | */ |
| 757 | if (sleepduration > intval) { |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 758 | bs.bs_bmissthreshold = conf.listen_interval * |
| 759 | ATH_DEFAULT_BMISS_LIMIT / 2; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 760 | } else { |
| 761 | bs.bs_bmissthreshold = |
| 762 | DIV_ROUND_UP(conf.bmiss_timeout, intval); |
| 763 | if (bs.bs_bmissthreshold > 15) |
| 764 | bs.bs_bmissthreshold = 15; |
| 765 | else if (bs.bs_bmissthreshold <= 0) |
| 766 | bs.bs_bmissthreshold = 1; |
| 767 | } |
| 768 | |
| 769 | /* |
| 770 | * Calculate sleep duration. The configuration is |
| 771 | * given in ms. We insure a multiple of the beacon |
| 772 | * period is used. Also, if the sleep duration is |
| 773 | * greater than the DTIM period then it makes senses |
| 774 | * to make it a multiple of that. |
| 775 | * |
| 776 | * XXX fixed at 100ms |
| 777 | */ |
| 778 | |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 779 | bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), |
| 780 | sleepduration); |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 781 | if (bs.bs_sleepduration > bs.bs_dtimperiod) |
| 782 | bs.bs_sleepduration = bs.bs_dtimperiod; |
| 783 | |
| 784 | DPRINTF(sc, ATH_DBG_BEACON, |
| 785 | "%s: tsf %llu " |
| 786 | "tsf:tu %u " |
| 787 | "intval %u " |
| 788 | "nexttbtt %u " |
| 789 | "dtim %u " |
| 790 | "nextdtim %u " |
| 791 | "bmiss %u " |
| 792 | "sleep %u " |
| 793 | "cfp:period %u " |
| 794 | "maxdur %u " |
| 795 | "next %u " |
Sujith | ff9b662 | 2008-08-14 13:27:16 +0530 | [diff] [blame] | 796 | "timoffset %u\n", |
| 797 | __func__, |
| 798 | (unsigned long long)tsf, tsftu, |
| 799 | bs.bs_intval, |
| 800 | bs.bs_nexttbtt, |
| 801 | bs.bs_dtimperiod, |
| 802 | bs.bs_nextdtim, |
| 803 | bs.bs_bmissthreshold, |
| 804 | bs.bs_sleepduration, |
| 805 | bs.bs_cfpperiod, |
| 806 | bs.bs_cfpmaxduration, |
| 807 | bs.bs_cfpnext, |
| 808 | bs.bs_timoffset |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 809 | ); |
| 810 | |
| 811 | ath9k_hw_set_interrupts(ah, 0); |
| 812 | ath9k_hw_set_sta_beacon_timers(ah, &bs); |
| 813 | sc->sc_imask |= ATH9K_INT_BMISS; |
| 814 | ath9k_hw_set_interrupts(ah, sc->sc_imask); |
| 815 | } else { |
| 816 | u64 tsf; |
| 817 | u32 tsftu; |
| 818 | ath9k_hw_set_interrupts(ah, 0); |
| 819 | if (nexttbtt == intval) |
| 820 | intval |= ATH9K_BEACON_RESET_TSF; |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 821 | if (sc->sc_ah->ah_opmode == ATH9K_M_IBSS) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 822 | /* |
| 823 | * Pull nexttbtt forward to reflect the current |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 824 | * TSF |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 825 | */ |
Sujith | 980b24d | 2008-09-17 10:15:09 +0530 | [diff] [blame] | 826 | #define FUDGE 2 |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 827 | if (!(intval & ATH9K_BEACON_RESET_TSF)) { |
| 828 | tsf = ath9k_hw_gettsf64(ah); |
| 829 | tsftu = TSF_TO_TU((u32)(tsf>>32), |
| 830 | (u32)tsf) + FUDGE; |
| 831 | do { |
| 832 | nexttbtt += intval; |
| 833 | } while (nexttbtt < tsftu); |
| 834 | } |
| 835 | #undef FUDGE |
| 836 | DPRINTF(sc, ATH_DBG_BEACON, |
| 837 | "%s: IBSS nexttbtt %u intval %u (%u)\n", |
| 838 | __func__, nexttbtt, |
| 839 | intval & ~ATH9K_BEACON_RESET_TSF, |
| 840 | conf.beacon_interval); |
| 841 | |
| 842 | /* |
| 843 | * In IBSS mode enable the beacon timers but only |
| 844 | * enable SWBA interrupts if we need to manually |
| 845 | * prepare beacon frames. Otherwise we use a |
| 846 | * self-linked tx descriptor and let the hardware |
| 847 | * deal with things. |
| 848 | */ |
| 849 | intval |= ATH9K_BEACON_ENA; |
Sujith | 60b67f5 | 2008-08-07 10:52:38 +0530 | [diff] [blame] | 850 | if (!(ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL)) |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 851 | sc->sc_imask |= ATH9K_INT_SWBA; |
| 852 | ath_beaconq_config(sc); |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 853 | } else if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) { |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 854 | /* |
| 855 | * In AP mode we enable the beacon timers and |
| 856 | * SWBA interrupts to prepare beacon frames. |
| 857 | */ |
| 858 | intval |= ATH9K_BEACON_ENA; |
| 859 | sc->sc_imask |= ATH9K_INT_SWBA; /* beacon prepare */ |
| 860 | ath_beaconq_config(sc); |
| 861 | } |
| 862 | ath9k_hw_beaconinit(ah, nexttbtt, intval); |
| 863 | sc->sc_bmisscount = 0; |
| 864 | ath9k_hw_set_interrupts(ah, sc->sc_imask); |
| 865 | /* |
| 866 | * When using a self-linked beacon descriptor in |
| 867 | * ibss mode load it once here. |
| 868 | */ |
Sujith | b4696c8b | 2008-08-11 14:04:52 +0530 | [diff] [blame] | 869 | if (sc->sc_ah->ah_opmode == ATH9K_M_IBSS && |
Sujith | 60b67f5 | 2008-08-07 10:52:38 +0530 | [diff] [blame] | 870 | (ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL)) |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 871 | ath_beacon_start_adhoc(sc, 0); |
| 872 | } |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 873 | } |
| 874 | |
| 875 | /* Function to collect beacon rssi data and resync beacon if necessary */ |
| 876 | |
| 877 | void ath_beacon_sync(struct ath_softc *sc, int if_id) |
| 878 | { |
| 879 | /* |
| 880 | * Resync beacon timers using the tsf of the |
| 881 | * beacon frame we just received. |
| 882 | */ |
| 883 | ath_beacon_config(sc, if_id); |
Sujith | 672840a | 2008-08-11 14:05:08 +0530 | [diff] [blame] | 884 | sc->sc_flags |= SC_OP_BEACONS; |
Luis R. Rodriguez | f078f20 | 2008-08-04 00:16:41 -0700 | [diff] [blame] | 885 | } |