2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
3 * Copyright (c) 2007-2009 Intel Corporation
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
33 * IEEE 802.11 TDMA mode support.
39 #ifdef IEEE80211_SUPPORT_TDMA
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/malloc.h>
45 #include <sys/kernel.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
49 #include <sys/endian.h>
50 #include <sys/errno.h>
52 #include <sys/sysctl.h>
55 #include <net/if_media.h>
56 #include <net/if_llc.h>
57 #include <net/ethernet.h>
61 #include <net80211/ieee80211_var.h>
62 #include <net80211/ieee80211_tdma.h>
63 #include <net80211/ieee80211_input.h>
65 #ifndef TDMA_SLOTLEN_DEFAULT
66 #define TDMA_SLOTLEN_DEFAULT 10*1000 /* 10ms */
68 #ifndef TDMA_SLOTCNT_DEFAULT
69 #define TDMA_SLOTCNT_DEFAULT 2 /* 2x (pt-to-pt) */
71 #ifndef TDMA_BINTVAL_DEFAULT
72 #define TDMA_BINTVAL_DEFAULT 5 /* 5x ~= 100TU beacon intvl */
74 #ifndef TDMA_TXRATE_11B_DEFAULT
75 #define TDMA_TXRATE_11B_DEFAULT 2*11
77 #ifndef TDMA_TXRATE_11G_DEFAULT
78 #define TDMA_TXRATE_11G_DEFAULT 2*24
80 #ifndef TDMA_TXRATE_11A_DEFAULT
81 #define TDMA_TXRATE_11A_DEFAULT 2*24
83 #ifndef TDMA_TXRATE_TURBO_DEFAULT
84 #define TDMA_TXRATE_TURBO_DEFAULT 2*24
86 #ifndef TDMA_TXRATE_HALF_DEFAULT
87 #define TDMA_TXRATE_HALF_DEFAULT 2*12
89 #ifndef TDMA_TXRATE_QUARTER_DEFAULT
90 #define TDMA_TXRATE_QUARTER_DEFAULT 2*6
92 #ifndef TDMA_TXRATE_11NA_DEFAULT
93 #define TDMA_TXRATE_11NA_DEFAULT (4 | IEEE80211_RATE_MCS)
95 #ifndef TDMA_TXRATE_11NG_DEFAULT
96 #define TDMA_TXRATE_11NG_DEFAULT (4 | IEEE80211_RATE_MCS)
99 #define TDMA_VERSION_VALID(_version) \
100 (TDMA_VERSION_V2 <= (_version) && (_version) <= TDMA_VERSION)
101 #define TDMA_SLOTCNT_VALID(_slotcnt) \
102 (2 <= (_slotcnt) && (_slotcnt) <= TDMA_MAXSLOTS)
103 /* XXX magic constants */
104 #define TDMA_SLOTLEN_VALID(_slotlen) \
105 (2*100 <= (_slotlen) && (unsigned)(_slotlen) <= 0xfffff)
106 /* XXX probably should set a max */
107 #define TDMA_BINTVAL_VALID(_bintval) (1 <= (_bintval))
110 * This code is not prepared to handle more than 2 slots.
112 CTASSERT(TDMA_MAXSLOTS == 2);
114 static void tdma_vdetach(struct ieee80211vap *vap);
115 static int tdma_newstate(struct ieee80211vap *, enum ieee80211_state, int);
116 static void tdma_beacon_miss(struct ieee80211vap *vap);
117 static void tdma_recv_mgmt(struct ieee80211_node *, struct mbuf *,
118 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
119 static int tdma_update(struct ieee80211vap *vap,
120 const struct ieee80211_tdma_param *tdma, struct ieee80211_node *ni,
122 static int tdma_process_params(struct ieee80211_node *ni,
123 const u_int8_t *ie, int rssi, int nf, const struct ieee80211_frame *wh);
126 settxparms(struct ieee80211vap *vap, enum ieee80211_phymode mode, int rate)
128 vap->iv_txparms[mode].ucastrate = rate;
129 vap->iv_txparms[mode].mcastrate = rate;
133 setackpolicy(struct ieee80211com *ic, int noack)
135 struct ieee80211_wme_state *wme = &ic->ic_wme;
138 for (ac = 0; ac < WME_NUM_AC; ac++) {
139 wme->wme_chanParams.cap_wmeParams[ac].wmep_noackPolicy = noack;
140 wme->wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy = noack;
145 ieee80211_tdma_vattach(struct ieee80211vap *vap)
147 struct ieee80211_tdma_state *ts;
149 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
150 ("not a tdma vap, caps 0x%x", vap->iv_caps));
152 ts = (struct ieee80211_tdma_state *) IEEE80211_MALLOC(
153 sizeof(struct ieee80211_tdma_state), M_80211_VAP,
154 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
156 printf("%s: cannot allocate TDMA state block\n", __func__);
157 /* NB: fall back to adhdemo mode */
158 vap->iv_caps &= ~IEEE80211_C_TDMA;
161 /* NB: default configuration is passive so no beacons */
162 ts->tdma_version = TDMA_VERSION;
163 ts->tdma_slotlen = TDMA_SLOTLEN_DEFAULT;
164 ts->tdma_slotcnt = TDMA_SLOTCNT_DEFAULT;
165 ts->tdma_bintval = TDMA_BINTVAL_DEFAULT;
166 ts->tdma_slot = 1; /* passive operation */
168 /* setup default fixed rates */
169 settxparms(vap, IEEE80211_MODE_11A, TDMA_TXRATE_11A_DEFAULT);
170 settxparms(vap, IEEE80211_MODE_11B, TDMA_TXRATE_11B_DEFAULT);
171 settxparms(vap, IEEE80211_MODE_11G, TDMA_TXRATE_11G_DEFAULT);
172 settxparms(vap, IEEE80211_MODE_TURBO_A, TDMA_TXRATE_TURBO_DEFAULT);
173 settxparms(vap, IEEE80211_MODE_TURBO_G, TDMA_TXRATE_TURBO_DEFAULT);
174 settxparms(vap, IEEE80211_MODE_STURBO_A, TDMA_TXRATE_TURBO_DEFAULT);
175 settxparms(vap, IEEE80211_MODE_11NA, TDMA_TXRATE_11NA_DEFAULT);
176 settxparms(vap, IEEE80211_MODE_11NG, TDMA_TXRATE_11NG_DEFAULT);
177 settxparms(vap, IEEE80211_MODE_HALF, TDMA_TXRATE_HALF_DEFAULT);
178 settxparms(vap, IEEE80211_MODE_QUARTER, TDMA_TXRATE_QUARTER_DEFAULT);
180 setackpolicy(vap->iv_ic, 1); /* disable ACK's */
182 ts->tdma_opdetach = vap->iv_opdetach;
183 vap->iv_opdetach = tdma_vdetach;
184 ts->tdma_newstate = vap->iv_newstate;
185 vap->iv_newstate = tdma_newstate;
186 vap->iv_bmiss = tdma_beacon_miss;
187 ts->tdma_recv_mgmt = vap->iv_recv_mgmt;
188 vap->iv_recv_mgmt = tdma_recv_mgmt;
194 tdma_vdetach(struct ieee80211vap *vap)
196 struct ieee80211_tdma_state *ts = vap->iv_tdma;
199 /* NB: should not have touched any ic state */
202 ts->tdma_opdetach(vap);
203 IEEE80211_FREE(vap->iv_tdma, M_80211_VAP);
206 setackpolicy(vap->iv_ic, 0); /* enable ACK's */
210 sta_leave(void *arg, struct ieee80211_node *ni)
212 struct ieee80211vap *vap = arg;
214 if (ni->ni_vap == vap && ni != vap->iv_bss)
215 ieee80211_node_leave(ni);
219 * TDMA state machine handler.
222 tdma_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
224 struct ieee80211_tdma_state *ts = vap->iv_tdma;
225 struct ieee80211com *ic = vap->iv_ic;
226 enum ieee80211_state ostate;
229 IEEE80211_LOCK_ASSERT(ic);
231 ostate = vap->iv_state;
232 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
233 __func__, ieee80211_state_name[ostate],
234 ieee80211_state_name[nstate], arg);
236 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
237 callout_stop(&vap->iv_swbmiss);
238 if (nstate == IEEE80211_S_SCAN &&
239 (ostate == IEEE80211_S_INIT || ostate == IEEE80211_S_RUN) &&
240 ts->tdma_slot != 0) {
242 * Override adhoc behaviour when operating as a slave;
243 * we need to scan even if the channel is locked.
245 vap->iv_state = nstate; /* state transition */
246 ieee80211_cancel_scan(vap); /* background scan */
247 if (ostate == IEEE80211_S_RUN) {
248 /* purge station table; entries are stale */
249 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
251 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
252 ieee80211_check_scan(vap,
253 vap->iv_scanreq_flags,
254 vap->iv_scanreq_duration,
255 vap->iv_scanreq_mindwell,
256 vap->iv_scanreq_maxdwell,
257 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
258 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
260 ieee80211_check_scan_current(vap);
263 status = ts->tdma_newstate(vap, nstate, arg);
266 nstate == IEEE80211_S_RUN && ostate != IEEE80211_S_RUN &&
267 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) &&
268 ts->tdma_slot != 0 &&
269 vap->iv_des_chan == IEEE80211_CHAN_ANYC) {
271 * Start s/w beacon miss timer for slave devices w/o
272 * hardware support. Note we do this only if we're
273 * not locked to a channel (i.e. roam to follow the
274 * master). The 2x is a fudge for our doing this in
277 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
278 2 * vap->iv_bmissthreshold * ts->tdma_bintval *
279 ((ts->tdma_slotcnt * ts->tdma_slotlen) / 1024));
280 vap->iv_swbmiss_count = 0;
281 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
282 ieee80211_swbmiss, vap);
288 tdma_beacon_miss(struct ieee80211vap *vap)
290 struct ieee80211_tdma_state *ts = vap->iv_tdma;
292 IEEE80211_LOCK_ASSERT(vap->iv_ic);
294 KASSERT((vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
295 KASSERT(vap->iv_state == IEEE80211_S_RUN,
296 ("wrong state %d", vap->iv_state));
298 IEEE80211_DPRINTF(vap,
299 IEEE80211_MSG_STATE | IEEE80211_MSG_TDMA | IEEE80211_MSG_DEBUG,
300 "beacon miss, mode %u state %s\n",
301 vap->iv_opmode, ieee80211_state_name[vap->iv_state]);
303 callout_stop(&vap->iv_swbmiss);
305 if (ts->tdma_peer != NULL) { /* XXX? can this be null? */
306 ieee80211_notify_node_leave(vap->iv_bss);
307 ts->tdma_peer = NULL;
309 * Treat beacon miss like an associate failure wrt the
310 * scan policy; this forces the entry in the scan cache
311 * to be ignored after several tries.
313 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr,
314 IEEE80211_STATUS_TIMEOUT);
317 ts->tdma_inuse = 0; /* clear slot usage */
319 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
323 tdma_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
324 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
326 struct ieee80211com *ic = ni->ni_ic;
327 struct ieee80211vap *vap = ni->ni_vap;
328 struct ieee80211_tdma_state *ts = vap->iv_tdma;
330 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON &&
331 (ic->ic_flags & IEEE80211_F_SCAN) == 0) {
332 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
333 struct ieee80211_scanparams scan;
335 /* XXX TODO: use rxstatus to determine off-channel beacons */
336 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) != 0)
338 if (scan.tdma == NULL) {
340 * TDMA stations must beacon a TDMA ie; ignore
342 * XXX detect overlapping bss and change channel
344 IEEE80211_DISCARD(vap,
345 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
346 wh, ieee80211_mgt_subtype_name[subtype >>
347 IEEE80211_FC0_SUBTYPE_SHIFT],
349 vap->iv_stats.is_rx_mgtdiscard++;
352 if (ni == vap->iv_bss &&
353 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
355 * Fake up a node for this newly
356 * discovered member of the IBSS.
358 ni = ieee80211_add_neighbor(vap, wh, &scan);
360 /* NB: stat kept for alloc failure */
365 * Check for state updates.
367 if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) {
369 * Count frame now that we know it's to be processed.
371 vap->iv_stats.is_rx_beacon++;
372 IEEE80211_NODE_STAT(ni, rx_beacons);
374 * Record tsf of last beacon. NB: this must be
375 * done before calling tdma_process_params
376 * as deeper routines reference it.
378 memcpy(&ni->ni_tstamp.data, scan.tstamp,
379 sizeof(ni->ni_tstamp.data));
381 * Count beacon frame for s/w bmiss handling.
383 vap->iv_swbmiss_count++;
385 * Process tdma ie. The contents are used to sync
386 * the slot timing, reconfigure the bss, etc.
388 (void) tdma_process_params(ni, scan.tdma, rssi, nf, wh);
392 * NB: defer remaining work to the adhoc code; this causes
393 * 2x parsing of the frame but should happen infrequently
396 ts->tdma_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
400 * Update TDMA state on receipt of a beacon frame with
401 * a TDMA information element. The sender's identity
402 * is provided so we can track who our peer is. If pickslot
403 * is non-zero we scan the slot allocation state in the ie
404 * to locate a free slot for our use.
407 tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma,
408 struct ieee80211_node *ni, int pickslot)
410 struct ieee80211_tdma_state *ts = vap->iv_tdma;
411 int slot, slotlen, update;
413 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
414 ("not a tdma vap, caps 0x%x", vap->iv_caps));
417 if (tdma->tdma_slotcnt != ts->tdma_slotcnt) {
418 if (!TDMA_SLOTCNT_VALID(tdma->tdma_slotcnt)) {
419 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
420 printf("%s: bad slot cnt %u\n",
421 __func__, tdma->tdma_slotcnt);
424 update |= TDMA_UPDATE_SLOTCNT;
426 slotlen = le16toh(tdma->tdma_slotlen) * 100;
427 if (slotlen != ts->tdma_slotlen) {
428 if (!TDMA_SLOTLEN_VALID(slotlen)) {
429 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
430 printf("%s: bad slot len %u\n",
434 update |= TDMA_UPDATE_SLOTLEN;
436 if (tdma->tdma_bintval != ts->tdma_bintval) {
437 if (!TDMA_BINTVAL_VALID(tdma->tdma_bintval)) {
438 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
439 printf("%s: bad beacon interval %u\n",
440 __func__, tdma->tdma_bintval);
443 update |= TDMA_UPDATE_BINTVAL;
445 slot = ts->tdma_slot;
448 * Pick unoccupied slot. Note we never choose slot 0.
450 for (slot = tdma->tdma_slotcnt-1; slot > 0; slot--)
451 if (isclr(tdma->tdma_inuse, slot))
454 printf("%s: no free slot, slotcnt %u inuse: 0x%x\n",
455 __func__, tdma->tdma_slotcnt,
456 tdma->tdma_inuse[0]);
457 /* XXX need to do something better */
460 if (slot != ts->tdma_slot)
461 update |= TDMA_UPDATE_SLOT;
463 if (ni != ts->tdma_peer) {
464 /* update everything */
465 update = TDMA_UPDATE_SLOT
466 | TDMA_UPDATE_SLOTCNT
467 | TDMA_UPDATE_SLOTLEN
468 | TDMA_UPDATE_BINTVAL;
473 * New/changed parameters; update runtime state.
475 /* XXX overwrites user parameters */
476 if (update & TDMA_UPDATE_SLOTCNT)
477 ts->tdma_slotcnt = tdma->tdma_slotcnt;
478 if (update & TDMA_UPDATE_SLOTLEN)
479 ts->tdma_slotlen = slotlen;
480 if (update & TDMA_UPDATE_SLOT)
481 ts->tdma_slot = slot;
482 if (update & TDMA_UPDATE_BINTVAL)
483 ts->tdma_bintval = tdma->tdma_bintval;
484 /* mark beacon to be updated before next xmit */
485 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
487 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
488 "%s: slot %u slotcnt %u slotlen %u us bintval %u\n",
489 __func__, ts->tdma_slot, ts->tdma_slotcnt,
490 ts->tdma_slotlen, ts->tdma_bintval);
493 * Notify driver. Note we can be called before
494 * entering RUN state if we scanned and are
495 * joining an existing bss. In that case do not
496 * call the driver because not all necessary state
497 * has been setup. The next beacon will dtrt.
499 if (vap->iv_state == IEEE80211_S_RUN)
500 vap->iv_ic->ic_tdma_update(ni, tdma, update);
502 * Dispatch join event on first beacon from new master.
504 if (ts->tdma_peer != ni) {
505 if (ts->tdma_peer != NULL)
506 ieee80211_notify_node_leave(vap->iv_bss);
507 ieee80211_notify_node_join(ni, 1);
508 /* NB: no reference, we just use the address */
515 * Process received TDMA parameters.
518 tdma_process_params(struct ieee80211_node *ni, const u_int8_t *ie,
519 int rssi, int nf, const struct ieee80211_frame *wh)
521 struct ieee80211vap *vap = ni->ni_vap;
522 struct ieee80211_tdma_state *ts = vap->iv_tdma;
523 const struct ieee80211_tdma_param *tdma =
524 (const struct ieee80211_tdma_param *) ie;
527 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
528 ("not a tdma vap, caps 0x%x", vap->iv_caps));
530 if (len < sizeof(*tdma) - 2) {
531 IEEE80211_DISCARD_IE(vap,
532 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
533 wh, "tdma", "too short, len %u", len);
534 return IEEE80211_REASON_IE_INVALID;
536 if (tdma->tdma_version != ts->tdma_version) {
537 IEEE80211_DISCARD_IE(vap,
538 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
539 wh, "tdma", "bad version %u (ours %u)",
540 tdma->tdma_version, ts->tdma_version);
541 return IEEE80211_REASON_IE_INVALID;
544 * NB: ideally we'd check against tdma_slotcnt, but that
545 * would require extra effort so do this easy check that
546 * covers the work below; more stringent checks are done
547 * before we make more extensive use of the ie contents.
549 if (tdma->tdma_slot >= TDMA_MAXSLOTS) {
550 IEEE80211_DISCARD_IE(vap,
551 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
552 wh, "tdma", "invalid slot %u", tdma->tdma_slot);
553 return IEEE80211_REASON_IE_INVALID;
556 * Can reach here while scanning, update
557 * operational state only in RUN state.
559 if (vap->iv_state == IEEE80211_S_RUN) {
560 if (tdma->tdma_slot != ts->tdma_slot &&
561 isclr(ts->tdma_inuse, tdma->tdma_slot)) {
562 IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni,
563 "discovered in slot %u", tdma->tdma_slot);
564 setbit(ts->tdma_inuse, tdma->tdma_slot);
565 /* XXX dispatch event only when operating as master */
566 if (ts->tdma_slot == 0)
567 ieee80211_notify_node_join(ni, 1);
569 setbit(ts->tdma_active, tdma->tdma_slot);
570 if (tdma->tdma_slot == ts->tdma_slot-1) {
572 * Slave tsf synchronization to station
573 * just before us in the schedule. The driver
574 * is responsible for copying the timestamp
575 * of the received beacon into our beacon
576 * frame so the sender can calculate round
577 * trip time. We cannot do that here because
578 * we don't know how to update our beacon frame.
580 (void) tdma_update(vap, tdma, ni, 0);
581 /* XXX reschedule swbmiss timer on parameter change */
582 } else if (tdma->tdma_slot == ts->tdma_slot+1) {
585 uint32_t rstamp = (uint32_t) le64toh(rs->tsf);
589 * Use returned timstamp to calculate the
592 memcpy(&tstamp, tdma->tdma_tstamp, 8);
594 /* XXX use only 15 bits of rstamp */
595 rtt = rstamp - (le64toh(tstamp) & 0x7fff);
598 /* XXX hack to quiet normal use */
599 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X,
600 "tdma rtt %5u [rstamp %5u tstamp %llu]\n",
602 (unsigned long long) le64toh(tstamp));
604 } else if (tdma->tdma_slot == ts->tdma_slot &&
605 le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) {
607 * Station using the same slot as us and has
608 * been around longer than us; we must move.
609 * Note this can happen if stations do not
610 * see each other while scanning.
612 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
613 "slot %u collision rxtsf %llu tsf %llu\n",
615 (unsigned long long) le64toh(ni->ni_tstamp.tsf),
616 vap->iv_bss->ni_tstamp.tsf);
617 setbit(ts->tdma_inuse, tdma->tdma_slot);
619 (void) tdma_update(vap, tdma, ni, 1);
626 ieee80211_tdma_getslot(struct ieee80211vap *vap)
628 struct ieee80211_tdma_state *ts = vap->iv_tdma;
630 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
631 ("not a tdma vap, caps 0x%x", vap->iv_caps));
632 return ts->tdma_slot;
636 * Parse a TDMA ie on station join and use it to setup node state.
639 ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie)
641 struct ieee80211vap *vap = ni->ni_vap;
643 if (vap->iv_caps & IEEE80211_C_TDMA) {
644 const struct ieee80211_tdma_param *tdma =
645 (const struct ieee80211_tdma_param *)ie;
646 struct ieee80211_tdma_state *ts = vap->iv_tdma;
648 * Adopt TDMA configuration when joining an
651 setbit(ts->tdma_inuse, tdma->tdma_slot);
652 (void) tdma_update(vap, tdma, ni, 1);
654 * Propagate capabilities based on the local
655 * configuration and the remote station's advertised
656 * capabilities. In particular this permits us to
657 * enable use of QoS to disable ACK's.
659 if ((vap->iv_flags & IEEE80211_F_WME) &&
660 ni->ni_ies.wme_ie != NULL)
661 ni->ni_flags |= IEEE80211_NODE_QOS;
665 #define TDMA_OUI_BYTES 0x00, 0x03, 0x7f
667 * Add a TDMA parameters element to a frame.
670 ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap)
672 #define ADDSHORT(frm, v) do { \
673 frm[0] = (v) & 0xff; \
677 static const struct ieee80211_tdma_param param = {
678 .tdma_id = IEEE80211_ELEMID_VENDOR,
679 .tdma_len = sizeof(struct ieee80211_tdma_param) - 2,
680 .tdma_oui = { TDMA_OUI_BYTES },
681 .tdma_type = TDMA_OUI_TYPE,
682 .tdma_subtype = TDMA_SUBTYPE_PARAM,
683 .tdma_version = TDMA_VERSION,
685 const struct ieee80211_tdma_state *ts = vap->iv_tdma;
688 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
689 ("not a tdma vap, caps 0x%x", vap->iv_caps));
691 memcpy(frm, ¶m, sizeof(param));
692 frm += __offsetof(struct ieee80211_tdma_param, tdma_slot);
693 *frm++ = ts->tdma_slot;
694 *frm++ = ts->tdma_slotcnt;
695 /* NB: convert units to fit in 16-bits */
696 slotlen = ts->tdma_slotlen / 100; /* 100us units */
697 ADDSHORT(frm, slotlen);
698 *frm++ = ts->tdma_bintval;
699 *frm++ = ts->tdma_inuse[0];
700 frm += 10; /* pad+timestamp */
704 #undef TDMA_OUI_BYTES
707 * Update TDMA state at TBTT.
710 ieee80211_tdma_update_beacon(struct ieee80211vap *vap,
711 struct ieee80211_beacon_offsets *bo)
713 struct ieee80211_tdma_state *ts = vap->iv_tdma;
715 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
716 ("not a tdma vap, caps 0x%x", vap->iv_caps));
718 if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) {
719 (void) ieee80211_add_tdma(bo->bo_tdma, vap);
720 clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
722 if (ts->tdma_slot != 0) /* only on master */
724 if (ts->tdma_count <= 0) {
726 * Time to update the mask of active/inuse stations.
727 * We track stations that we've received a beacon
728 * frame from and update this mask periodically.
729 * This allows us to miss a few beacons before marking
730 * a slot free for re-use.
732 ts->tdma_inuse[0] = ts->tdma_active[0];
733 ts->tdma_active[0] = 0x01;
734 /* update next time 'round */
735 /* XXX use notify framework */
736 setbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
737 /* NB: use s/w beacon miss threshold; may be too high */
738 ts->tdma_count = vap->iv_bmissthreshold-1;
744 tdma_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
746 struct ieee80211_tdma_state *ts = vap->iv_tdma;
748 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
751 switch (ireq->i_type) {
752 case IEEE80211_IOC_TDMA_SLOT:
753 ireq->i_val = ts->tdma_slot;
755 case IEEE80211_IOC_TDMA_SLOTCNT:
756 ireq->i_val = ts->tdma_slotcnt;
758 case IEEE80211_IOC_TDMA_SLOTLEN:
759 ireq->i_val = ts->tdma_slotlen;
761 case IEEE80211_IOC_TDMA_BINTERVAL:
762 ireq->i_val = ts->tdma_bintval;
769 IEEE80211_IOCTL_GET(tdma, tdma_ioctl_get80211);
772 tdma_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
774 struct ieee80211_tdma_state *ts = vap->iv_tdma;
776 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
779 switch (ireq->i_type) {
780 case IEEE80211_IOC_TDMA_SLOT:
781 if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt))
783 if (ireq->i_val != ts->tdma_slot) {
784 ts->tdma_slot = ireq->i_val;
788 case IEEE80211_IOC_TDMA_SLOTCNT:
789 if (!TDMA_SLOTCNT_VALID(ireq->i_val))
791 if (ireq->i_val != ts->tdma_slotcnt) {
792 ts->tdma_slotcnt = ireq->i_val;
796 case IEEE80211_IOC_TDMA_SLOTLEN:
799 * 150 insures at least 1/8 TU
800 * 0xfffff is the max duration for bursting
801 * (implict by way of 16-bit data type for i_val)
803 if (!TDMA_SLOTLEN_VALID(ireq->i_val))
805 if (ireq->i_val != ts->tdma_slotlen) {
806 ts->tdma_slotlen = ireq->i_val;
810 case IEEE80211_IOC_TDMA_BINTERVAL:
811 if (!TDMA_BINTVAL_VALID(ireq->i_val))
813 if (ireq->i_val != ts->tdma_bintval) {
814 ts->tdma_bintval = ireq->i_val;
823 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
826 IEEE80211_IOCTL_SET(tdma, tdma_ioctl_set80211);
828 #endif /* IEEE80211_SUPPORT_TDMA */