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
rtwn_reset_beacon_valid(struct rtwn_softc * sc,int id)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
rtwn_check_beacon_valid(struct rtwn_softc * sc,int id)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
rtwn_switch_bcnq(struct rtwn_softc * sc,int id)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
rtwn_setup_beacon(struct rtwn_softc * sc,struct ieee80211_node * ni)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
rtwn_tx_beacon(struct rtwn_softc * sc,struct rtwn_vap * uvp)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
rtwn_update_beacon(struct ieee80211vap * vap,int item)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
rtwn_tx_beacon_csa(void * arg,int npending __unused)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
rtwn_tx_beacon_check(struct rtwn_softc * sc,struct rtwn_vap * uvp)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