1 /*- 2 * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr> 3 * Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org> 4 * Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/param.h> 20 #include <sys/lock.h> 21 #include <sys/mutex.h> 22 #include <sys/mbuf.h> 23 #include <sys/kernel.h> 24 #include <sys/socket.h> 25 #include <sys/systm.h> 26 #include <sys/malloc.h> 27 #include <sys/queue.h> 28 #include <sys/taskqueue.h> 29 #include <sys/bus.h> 30 #include <sys/endian.h> 31 32 #include <net/if.h> 33 #include <net/ethernet.h> 34 #include <net/if_media.h> 35 36 #include <net80211/ieee80211_var.h> 37 #include <net80211/ieee80211_radiotap.h> 38 39 #include <dev/rtwn/if_rtwnvar.h> 40 41 #include <dev/rtwn/if_rtwn_beacon.h> 42 #include <dev/rtwn/if_rtwn_debug.h> 43 #include <dev/rtwn/if_rtwn_tx.h> 44 45 #include <dev/rtwn/rtl8192c/r92c_reg.h> 46 47 static void 48 rtwn_reset_beacon_valid(struct rtwn_softc *sc, int id) 49 { 50 51 KASSERT (id == 0 || id == 1, ("wrong port id %d\n", id)); 52 53 /* XXX cannot be cleared on RTL8188CE */ 54 rtwn_setbits_1_shift(sc, sc->bcn_status_reg[id], 55 R92C_TDECTRL_BCN_VALID, 0, 2); 56 57 RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON, 58 "%s: 'beacon valid' bit for vap %d was unset\n", 59 __func__, id); 60 } 61 62 static int 63 rtwn_check_beacon_valid(struct rtwn_softc *sc, int id) 64 { 65 uint16_t reg; 66 int ntries; 67 68 if (id == RTWN_VAP_ID_INVALID) 69 return (0); 70 71 reg = sc->bcn_status_reg[id]; 72 for (ntries = 0; ntries < 10; ntries++) { 73 if (rtwn_read_4(sc, reg) & R92C_TDECTRL_BCN_VALID) { 74 RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON, 75 "%s: beacon for vap %d was recognized\n", 76 __func__, id); 77 break; 78 } 79 rtwn_delay(sc, sc->bcn_check_interval); 80 } 81 if (ntries == 10) 82 return (ETIMEDOUT); 83 84 return (0); 85 } 86 87 void 88 rtwn_switch_bcnq(struct rtwn_softc *sc, int id) 89 { 90 91 if (sc->cur_bcnq_id != id) { 92 /* Wait until any previous transmit completes. */ 93 (void) rtwn_check_beacon_valid(sc, sc->cur_bcnq_id); 94 95 /* Change current port. */ 96 rtwn_beacon_select(sc, id); 97 sc->cur_bcnq_id = id; 98 } 99 100 /* Reset 'beacon valid' bit. */ 101 rtwn_reset_beacon_valid(sc, id); 102 } 103 104 int 105 rtwn_setup_beacon(struct rtwn_softc *sc, struct ieee80211_node *ni) 106 { 107 struct ieee80211vap *vap = ni->ni_vap; 108 struct rtwn_vap *uvp = RTWN_VAP(vap); 109 struct mbuf *m; 110 111 RTWN_ASSERT_LOCKED(sc); 112 113 if (ni->ni_chan == IEEE80211_CHAN_ANYC) 114 return (EINVAL); 115 116 m = ieee80211_beacon_alloc(ni); 117 if (m == NULL) { 118 device_printf(sc->sc_dev, 119 "%s: could not allocate beacon frame\n", __func__); 120 return (ENOMEM); 121 } 122 123 if (uvp->bcn_mbuf != NULL) { 124 rtwn_beacon_unload(sc, uvp->id); 125 m_freem(uvp->bcn_mbuf); 126 } 127 128 uvp->bcn_mbuf = m; 129 130 rtwn_beacon_set_rate(sc, &uvp->bcn_desc.txd[0], 131 IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)); 132 133 return (rtwn_tx_beacon_check(sc, uvp)); 134 } 135 136 /* 137 * Push a beacon frame into the chip. Beacon will 138 * be repeated by the chip every R92C_BCN_INTERVAL. 139 */ 140 static int 141 rtwn_tx_beacon(struct rtwn_softc *sc, struct rtwn_vap *uvp) 142 { 143 int error; 144 145 RTWN_ASSERT_LOCKED(sc); 146 147 RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON, 148 "%s: sending beacon for vap %d\n", __func__, uvp->id); 149 150 error = rtwn_tx_start(sc, NULL, uvp->bcn_mbuf, &uvp->bcn_desc.txd[0], 151 IEEE80211_FC0_TYPE_MGT, uvp->id); 152 153 return (error); 154 } 155 156 void 157 rtwn_update_beacon(struct ieee80211vap *vap, int item) 158 { 159 struct ieee80211com *ic = vap->iv_ic; 160 struct rtwn_softc *sc = ic->ic_softc; 161 struct rtwn_vap *uvp = RTWN_VAP(vap); 162 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; 163 struct ieee80211_node *ni = vap->iv_bss; 164 int mcast = 0; 165 166 RTWN_LOCK(sc); 167 if (uvp->bcn_mbuf == NULL) { 168 uvp->bcn_mbuf = ieee80211_beacon_alloc(ni); 169 if (uvp->bcn_mbuf == NULL) { 170 device_printf(sc->sc_dev, 171 "%s: could not allocate beacon frame\n", __func__); 172 RTWN_UNLOCK(sc); 173 return; 174 } 175 } 176 177 RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON, 178 "%s: vap id %d, iv_csa_count %d, ic_csa_count %d, item %d\n", 179 __func__, uvp->id, vap->iv_csa_count, ic->ic_csa_count, item); 180 181 switch (item) { 182 case IEEE80211_BEACON_CSA: 183 if (vap->iv_csa_count != ic->ic_csa_count) { 184 /* 185 * XXX two APs with different beacon intervals 186 * are not handled properly. 187 */ 188 /* XXX check TBTT? */ 189 taskqueue_enqueue_timeout(taskqueue_thread, 190 &uvp->tx_beacon_csa, 191 msecs_to_ticks(ni->ni_intval)); 192 } 193 break; 194 case IEEE80211_BEACON_TIM: 195 mcast = 1; /* XXX */ 196 break; 197 default: 198 break; 199 } 200 201 setbit(bo->bo_flags, item); 202 203 rtwn_beacon_update_begin(sc, vap); 204 RTWN_UNLOCK(sc); 205 206 ieee80211_beacon_update(ni, uvp->bcn_mbuf, mcast); 207 208 /* XXX clear manually */ 209 clrbit(bo->bo_flags, IEEE80211_BEACON_CSA); 210 211 RTWN_LOCK(sc); 212 rtwn_tx_beacon(sc, uvp); 213 rtwn_beacon_update_end(sc, vap); 214 RTWN_UNLOCK(sc); 215 } 216 217 void 218 rtwn_tx_beacon_csa(void *arg, int npending __unused) 219 { 220 struct ieee80211vap *vap = arg; 221 struct ieee80211com *ic = vap->iv_ic; 222 struct rtwn_softc *sc = ic->ic_softc; 223 struct rtwn_vap *rvp = RTWN_VAP(vap); 224 225 KASSERT (rvp->id == 0 || rvp->id == 1, 226 ("wrong port id %d\n", rvp->id)); 227 228 IEEE80211_LOCK(ic); 229 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 230 RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON, 231 "%s: vap id %d, iv_csa_count %d, ic_csa_count %d\n", 232 __func__, rvp->id, vap->iv_csa_count, ic->ic_csa_count); 233 234 rtwn_update_beacon(vap, IEEE80211_BEACON_CSA); 235 } 236 IEEE80211_UNLOCK(ic); 237 238 (void) rvp; 239 } 240 241 int 242 rtwn_tx_beacon_check(struct rtwn_softc *sc, struct rtwn_vap *uvp) 243 { 244 int ntries, error; 245 246 for (ntries = 0; ntries < 5; ntries++) { 247 rtwn_reset_beacon_valid(sc, uvp->id); 248 249 error = rtwn_tx_beacon(sc, uvp); 250 if (error != 0) 251 continue; 252 253 error = rtwn_check_beacon_valid(sc, uvp->id); 254 if (error == 0) 255 break; 256 } 257 if (ntries == 5) { 258 device_printf(sc->sc_dev, 259 "%s: cannot push beacon into chip, error %d!\n", 260 __func__, error); 261 return (error); 262 } 263 264 return (0); 265 } 266