xref: /freebsd/sys/dev/rtwn/if_rtwn_beacon.c (revision 401ab69cff8fa2320a9f8ea4baa114a6da6c952b)
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/cdefs.h>
20 #include <sys/param.h>
21 #include <sys/lock.h>
22 #include <sys/mutex.h>
23 #include <sys/mbuf.h>
24 #include <sys/kernel.h>
25 #include <sys/socket.h>
26 #include <sys/systm.h>
27 #include <sys/malloc.h>
28 #include <sys/queue.h>
29 #include <sys/taskqueue.h>
30 #include <sys/bus.h>
31 #include <sys/endian.h>
32 
33 #include <net/if.h>
34 #include <net/ethernet.h>
35 #include <net/if_media.h>
36 
37 #include <net80211/ieee80211_var.h>
38 #include <net80211/ieee80211_radiotap.h>
39 
40 #include <dev/rtwn/if_rtwnvar.h>
41 
42 #include <dev/rtwn/if_rtwn_beacon.h>
43 #include <dev/rtwn/if_rtwn_debug.h>
44 #include <dev/rtwn/if_rtwn_tx.h>
45 
46 #include <dev/rtwn/rtl8192c/r92c_reg.h>
47 
48 static void
49 rtwn_reset_beacon_valid(struct rtwn_softc *sc, int id)
50 {
51 
52 	KASSERT (id == 0 || id == 1, ("wrong port id %d\n", id));
53 
54 	/* XXX cannot be cleared on RTL8188CE */
55 	rtwn_setbits_1_shift(sc, sc->bcn_status_reg[id],
56 	    R92C_TDECTRL_BCN_VALID, 0, 2);
57 
58 	RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
59 	    "%s: 'beacon valid' bit for vap %d was unset\n",
60 	    __func__, id);
61 }
62 
63 static int
64 rtwn_check_beacon_valid(struct rtwn_softc *sc, int id)
65 {
66 	uint16_t reg;
67 	int ntries;
68 
69 	if (id == RTWN_VAP_ID_INVALID)
70 		return (0);
71 
72 	reg = sc->bcn_status_reg[id];
73 	for (ntries = 0; ntries < 10; ntries++) {
74 		if (rtwn_read_4(sc, reg) & R92C_TDECTRL_BCN_VALID) {
75 			RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
76 			    "%s: beacon for vap %d was recognized\n",
77 			    __func__, id);
78 			break;
79 		}
80 		rtwn_delay(sc, sc->bcn_check_interval);
81 	}
82 	if (ntries == 10)
83 		return (ETIMEDOUT);
84 
85 	return (0);
86 }
87 
88 void
89 rtwn_switch_bcnq(struct rtwn_softc *sc, int id)
90 {
91 
92 	if (sc->cur_bcnq_id != id) {
93 		/* Wait until any previous transmit completes. */
94 		(void) rtwn_check_beacon_valid(sc, sc->cur_bcnq_id);
95 
96 		/* Change current port. */
97 		rtwn_beacon_select(sc, id);
98 		sc->cur_bcnq_id = id;
99 	}
100 
101 	/* Reset 'beacon valid' bit. */
102 	rtwn_reset_beacon_valid(sc, id);
103 }
104 
105 int
106 rtwn_setup_beacon(struct rtwn_softc *sc, struct ieee80211_node *ni)
107 {
108 	struct ieee80211vap *vap = ni->ni_vap;
109 	struct rtwn_vap *uvp = RTWN_VAP(vap);
110 	struct mbuf *m;
111 
112 	RTWN_ASSERT_LOCKED(sc);
113 
114 	if (ni->ni_chan == IEEE80211_CHAN_ANYC)
115 		return (EINVAL);
116 
117 	m = ieee80211_beacon_alloc(ni);
118 	if (m == NULL) {
119 		device_printf(sc->sc_dev,
120 		    "%s: could not allocate beacon frame\n", __func__);
121 		return (ENOMEM);
122 	}
123 
124 	if (uvp->bcn_mbuf != NULL) {
125 		rtwn_beacon_unload(sc, uvp->id);
126 		m_freem(uvp->bcn_mbuf);
127 	}
128 
129 	uvp->bcn_mbuf = m;
130 
131 	rtwn_beacon_set_rate(sc, &uvp->bcn_desc.txd[0],
132 	    IEEE80211_IS_CHAN_5GHZ(ni->ni_chan));
133 
134 	return (rtwn_tx_beacon_check(sc, uvp));
135 }
136 
137 /*
138  * Push a beacon frame into the chip. Beacon will
139  * be repeated by the chip every R92C_BCN_INTERVAL.
140  */
141 static int
142 rtwn_tx_beacon(struct rtwn_softc *sc, struct rtwn_vap *uvp)
143 {
144 	int error;
145 
146 	RTWN_ASSERT_LOCKED(sc);
147 
148 	RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
149 	    "%s: sending beacon for vap %d\n", __func__, uvp->id);
150 
151 	error = rtwn_tx_start(sc, NULL, uvp->bcn_mbuf, &uvp->bcn_desc.txd[0],
152 	    IEEE80211_FC0_TYPE_MGT, uvp->id);
153 
154 	return (error);
155 }
156 
157 void
158 rtwn_update_beacon(struct ieee80211vap *vap, int item)
159 {
160 	struct ieee80211com *ic = vap->iv_ic;
161 	struct rtwn_softc *sc = ic->ic_softc;
162 	struct rtwn_vap *uvp = RTWN_VAP(vap);
163 	struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
164 	struct ieee80211_node *ni = vap->iv_bss;
165 	int mcast = 0;
166 
167 	RTWN_LOCK(sc);
168 	if (uvp->bcn_mbuf == NULL) {
169 		uvp->bcn_mbuf = ieee80211_beacon_alloc(ni);
170 		if (uvp->bcn_mbuf == NULL) {
171 			device_printf(sc->sc_dev,
172 			    "%s: could not allocate beacon frame\n", __func__);
173 			RTWN_UNLOCK(sc);
174 			return;
175 		}
176 	}
177 
178 	RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
179 	    "%s: vap id %d, iv_csa_count %d, ic_csa_count %d, item %d\n",
180 	    __func__, uvp->id, vap->iv_csa_count, ic->ic_csa_count, item);
181 
182 	switch (item) {
183 	case IEEE80211_BEACON_CSA:
184 		if (vap->iv_csa_count != ic->ic_csa_count) {
185 			/*
186 			 * XXX two APs with different beacon intervals
187 			 * are not handled properly.
188 			 */
189 			/* XXX check TBTT? */
190 			taskqueue_enqueue_timeout(taskqueue_thread,
191 			    &uvp->tx_beacon_csa,
192 			    msecs_to_ticks(ni->ni_intval));
193 		}
194 		break;
195 	case IEEE80211_BEACON_TIM:
196 		mcast = 1;	/* XXX */
197 		break;
198 	default:
199 		break;
200 	}
201 
202 	setbit(bo->bo_flags, item);
203 
204 	rtwn_beacon_update_begin(sc, vap);
205 	RTWN_UNLOCK(sc);
206 
207 	ieee80211_beacon_update(ni, uvp->bcn_mbuf, mcast);
208 
209 	/* XXX clear manually */
210 	clrbit(bo->bo_flags, IEEE80211_BEACON_CSA);
211 
212 	RTWN_LOCK(sc);
213 	rtwn_tx_beacon(sc, uvp);
214 	rtwn_beacon_update_end(sc, vap);
215 	RTWN_UNLOCK(sc);
216 }
217 
218 void
219 rtwn_tx_beacon_csa(void *arg, int npending __unused)
220 {
221 	struct ieee80211vap *vap = arg;
222 	struct ieee80211com *ic = vap->iv_ic;
223 	struct rtwn_softc *sc = ic->ic_softc;
224 	struct rtwn_vap *rvp = RTWN_VAP(vap);
225 
226 	KASSERT (rvp->id == 0 || rvp->id == 1,
227 	    ("wrong port id %d\n", rvp->id));
228 
229 	IEEE80211_LOCK(ic);
230 	if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
231 		RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
232 		    "%s: vap id %d, iv_csa_count %d, ic_csa_count %d\n",
233 		    __func__, rvp->id, vap->iv_csa_count, ic->ic_csa_count);
234 
235 		rtwn_update_beacon(vap, IEEE80211_BEACON_CSA);
236 	}
237 	IEEE80211_UNLOCK(ic);
238 
239 	(void) rvp;
240 }
241 
242 int
243 rtwn_tx_beacon_check(struct rtwn_softc *sc, struct rtwn_vap *uvp)
244 {
245 	int ntries, error;
246 
247 	for (ntries = 0; ntries < 5; ntries++) {
248 		rtwn_reset_beacon_valid(sc, uvp->id);
249 
250 		error = rtwn_tx_beacon(sc, uvp);
251 		if (error != 0)
252 			continue;
253 
254 		error = rtwn_check_beacon_valid(sc, uvp->id);
255 		if (error == 0)
256 			break;
257 	}
258 	if (ntries == 5) {
259 		device_printf(sc->sc_dev,
260 		    "%s: cannot push beacon into chip, error %d!\n",
261 		    __func__, error);
262 		return (error);
263 	}
264 
265 	return (0);
266 }
267