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 if (isclr(vap->iv_ic->ic_modecaps, mode))
131 vap->iv_txparms[mode].ucastrate = rate;
132 vap->iv_txparms[mode].mcastrate = rate;
136 setackpolicy(struct ieee80211com *ic, int noack)
138 struct ieee80211_wme_state *wme = &ic->ic_wme;
141 for (ac = 0; ac < WME_NUM_AC; ac++) {
142 wme->wme_chanParams.cap_wmeParams[ac].wmep_noackPolicy = noack;
143 wme->wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy = noack;
148 ieee80211_tdma_vattach(struct ieee80211vap *vap)
150 struct ieee80211_tdma_state *ts;
152 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
153 ("not a tdma vap, caps 0x%x", vap->iv_caps));
155 ts = (struct ieee80211_tdma_state *) IEEE80211_MALLOC(
156 sizeof(struct ieee80211_tdma_state), M_80211_VAP,
157 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
159 printf("%s: cannot allocate TDMA state block\n", __func__);
160 /* NB: fall back to adhdemo mode */
161 vap->iv_caps &= ~IEEE80211_C_TDMA;
164 /* NB: default configuration is passive so no beacons */
165 ts->tdma_version = TDMA_VERSION;
166 ts->tdma_slotlen = TDMA_SLOTLEN_DEFAULT;
167 ts->tdma_slotcnt = TDMA_SLOTCNT_DEFAULT;
168 ts->tdma_bintval = TDMA_BINTVAL_DEFAULT;
169 ts->tdma_slot = 1; /* passive operation */
171 /* setup default fixed rates */
172 settxparms(vap, IEEE80211_MODE_11A, TDMA_TXRATE_11A_DEFAULT);
173 settxparms(vap, IEEE80211_MODE_11B, TDMA_TXRATE_11B_DEFAULT);
174 settxparms(vap, IEEE80211_MODE_11G, TDMA_TXRATE_11G_DEFAULT);
175 settxparms(vap, IEEE80211_MODE_TURBO_A, TDMA_TXRATE_TURBO_DEFAULT);
176 settxparms(vap, IEEE80211_MODE_TURBO_G, TDMA_TXRATE_TURBO_DEFAULT);
177 settxparms(vap, IEEE80211_MODE_STURBO_A, TDMA_TXRATE_TURBO_DEFAULT);
178 settxparms(vap, IEEE80211_MODE_11NA, TDMA_TXRATE_11NA_DEFAULT);
179 settxparms(vap, IEEE80211_MODE_11NG, TDMA_TXRATE_11NG_DEFAULT);
180 settxparms(vap, IEEE80211_MODE_HALF, TDMA_TXRATE_HALF_DEFAULT);
181 settxparms(vap, IEEE80211_MODE_QUARTER, TDMA_TXRATE_QUARTER_DEFAULT);
183 setackpolicy(vap->iv_ic, 1); /* disable ACK's */
185 ts->tdma_opdetach = vap->iv_opdetach;
186 vap->iv_opdetach = tdma_vdetach;
187 ts->tdma_newstate = vap->iv_newstate;
188 vap->iv_newstate = tdma_newstate;
189 vap->iv_bmiss = tdma_beacon_miss;
190 ts->tdma_recv_mgmt = vap->iv_recv_mgmt;
191 vap->iv_recv_mgmt = tdma_recv_mgmt;
197 tdma_vdetach(struct ieee80211vap *vap)
199 struct ieee80211_tdma_state *ts = vap->iv_tdma;
202 /* NB: should not have touched any ic state */
205 ts->tdma_opdetach(vap);
206 IEEE80211_FREE(vap->iv_tdma, M_80211_VAP);
209 setackpolicy(vap->iv_ic, 0); /* enable ACK's */
213 sta_leave(void *arg, struct ieee80211_node *ni)
215 struct ieee80211vap *vap = arg;
217 if (ni->ni_vap == vap && ni != vap->iv_bss)
218 ieee80211_node_leave(ni);
222 * TDMA state machine handler.
225 tdma_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
227 struct ieee80211_tdma_state *ts = vap->iv_tdma;
228 struct ieee80211com *ic = vap->iv_ic;
229 enum ieee80211_state ostate;
232 IEEE80211_LOCK_ASSERT(ic);
234 ostate = vap->iv_state;
235 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
236 __func__, ieee80211_state_name[ostate],
237 ieee80211_state_name[nstate], arg);
239 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
240 callout_stop(&vap->iv_swbmiss);
241 if (nstate == IEEE80211_S_SCAN &&
242 (ostate == IEEE80211_S_INIT || ostate == IEEE80211_S_RUN) &&
243 ts->tdma_slot != 0) {
245 * Override adhoc behaviour when operating as a slave;
246 * we need to scan even if the channel is locked.
248 vap->iv_state = nstate; /* state transition */
249 ieee80211_cancel_scan(vap); /* background scan */
250 if (ostate == IEEE80211_S_RUN) {
251 /* purge station table; entries are stale */
252 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
254 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
255 ieee80211_check_scan(vap,
256 vap->iv_scanreq_flags,
257 vap->iv_scanreq_duration,
258 vap->iv_scanreq_mindwell,
259 vap->iv_scanreq_maxdwell,
260 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
261 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
263 ieee80211_check_scan_current(vap);
266 status = ts->tdma_newstate(vap, nstate, arg);
269 nstate == IEEE80211_S_RUN && ostate != IEEE80211_S_RUN &&
270 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) &&
271 ts->tdma_slot != 0 &&
272 vap->iv_des_chan == IEEE80211_CHAN_ANYC) {
274 * Start s/w beacon miss timer for slave devices w/o
275 * hardware support. Note we do this only if we're
276 * not locked to a channel (i.e. roam to follow the
277 * master). The 2x is a fudge for our doing this in
280 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
281 2 * vap->iv_bmissthreshold * ts->tdma_bintval *
282 ((ts->tdma_slotcnt * ts->tdma_slotlen) / 1024));
283 vap->iv_swbmiss_count = 0;
284 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
285 ieee80211_swbmiss, vap);
291 tdma_beacon_miss(struct ieee80211vap *vap)
293 struct ieee80211_tdma_state *ts = vap->iv_tdma;
295 IEEE80211_LOCK_ASSERT(vap->iv_ic);
297 KASSERT((vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
298 KASSERT(vap->iv_state == IEEE80211_S_RUN,
299 ("wrong state %d", vap->iv_state));
301 IEEE80211_DPRINTF(vap,
302 IEEE80211_MSG_STATE | IEEE80211_MSG_TDMA | IEEE80211_MSG_DEBUG,
303 "beacon miss, mode %u state %s\n",
304 vap->iv_opmode, ieee80211_state_name[vap->iv_state]);
306 callout_stop(&vap->iv_swbmiss);
308 if (ts->tdma_peer != NULL) { /* XXX? can this be null? */
309 ieee80211_notify_node_leave(vap->iv_bss);
310 ts->tdma_peer = NULL;
312 * Treat beacon miss like an associate failure wrt the
313 * scan policy; this forces the entry in the scan cache
314 * to be ignored after several tries.
316 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr,
317 IEEE80211_STATUS_TIMEOUT);
320 ts->tdma_inuse = 0; /* clear slot usage */
322 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
326 tdma_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
327 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
329 struct ieee80211com *ic = ni->ni_ic;
330 struct ieee80211vap *vap = ni->ni_vap;
331 struct ieee80211_tdma_state *ts = vap->iv_tdma;
333 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON &&
334 (ic->ic_flags & IEEE80211_F_SCAN) == 0) {
335 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
336 struct ieee80211_scanparams scan;
338 /* XXX TODO: use rxstatus to determine off-channel beacons */
339 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) != 0)
341 if (scan.tdma == NULL) {
343 * TDMA stations must beacon a TDMA ie; ignore
345 * XXX detect overlapping bss and change channel
347 IEEE80211_DISCARD(vap,
348 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
349 wh, ieee80211_mgt_subtype_name(subtype),
351 vap->iv_stats.is_rx_mgtdiscard++;
354 if (ni == vap->iv_bss &&
355 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
357 * Fake up a node for this newly
358 * discovered member of the IBSS.
360 ni = ieee80211_add_neighbor(vap, wh, &scan);
362 /* NB: stat kept for alloc failure */
367 * Check for state updates.
369 if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) {
371 * Count frame now that we know it's to be processed.
373 vap->iv_stats.is_rx_beacon++;
374 IEEE80211_NODE_STAT(ni, rx_beacons);
376 * Record tsf of last beacon. NB: this must be
377 * done before calling tdma_process_params
378 * as deeper routines reference it.
380 memcpy(&ni->ni_tstamp.data, scan.tstamp,
381 sizeof(ni->ni_tstamp.data));
383 * Count beacon frame for s/w bmiss handling.
385 vap->iv_swbmiss_count++;
387 * Process tdma ie. The contents are used to sync
388 * the slot timing, reconfigure the bss, etc.
390 (void) tdma_process_params(ni, scan.tdma, rssi, nf, wh);
394 * NB: defer remaining work to the adhoc code; this causes
395 * 2x parsing of the frame but should happen infrequently
398 ts->tdma_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
402 * Update TDMA state on receipt of a beacon frame with
403 * a TDMA information element. The sender's identity
404 * is provided so we can track who our peer is. If pickslot
405 * is non-zero we scan the slot allocation state in the ie
406 * to locate a free slot for our use.
409 tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma,
410 struct ieee80211_node *ni, int pickslot)
412 struct ieee80211_tdma_state *ts = vap->iv_tdma;
413 int slot, slotlen, update;
415 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
416 ("not a tdma vap, caps 0x%x", vap->iv_caps));
419 if (tdma->tdma_slotcnt != ts->tdma_slotcnt) {
420 if (!TDMA_SLOTCNT_VALID(tdma->tdma_slotcnt)) {
421 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
422 printf("%s: bad slot cnt %u\n",
423 __func__, tdma->tdma_slotcnt);
426 update |= TDMA_UPDATE_SLOTCNT;
428 slotlen = le16toh(tdma->tdma_slotlen) * 100;
429 if (slotlen != ts->tdma_slotlen) {
430 if (!TDMA_SLOTLEN_VALID(slotlen)) {
431 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
432 printf("%s: bad slot len %u\n",
436 update |= TDMA_UPDATE_SLOTLEN;
438 if (tdma->tdma_bintval != ts->tdma_bintval) {
439 if (!TDMA_BINTVAL_VALID(tdma->tdma_bintval)) {
440 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
441 printf("%s: bad beacon interval %u\n",
442 __func__, tdma->tdma_bintval);
445 update |= TDMA_UPDATE_BINTVAL;
447 slot = ts->tdma_slot;
450 * Pick unoccupied slot. Note we never choose slot 0.
452 for (slot = tdma->tdma_slotcnt-1; slot > 0; slot--)
453 if (isclr(tdma->tdma_inuse, slot))
456 printf("%s: no free slot, slotcnt %u inuse: 0x%x\n",
457 __func__, tdma->tdma_slotcnt,
458 tdma->tdma_inuse[0]);
459 /* XXX need to do something better */
462 if (slot != ts->tdma_slot)
463 update |= TDMA_UPDATE_SLOT;
465 if (ni != ts->tdma_peer) {
466 /* update everything */
467 update = TDMA_UPDATE_SLOT
468 | TDMA_UPDATE_SLOTCNT
469 | TDMA_UPDATE_SLOTLEN
470 | TDMA_UPDATE_BINTVAL;
475 * New/changed parameters; update runtime state.
477 /* XXX overwrites user parameters */
478 if (update & TDMA_UPDATE_SLOTCNT)
479 ts->tdma_slotcnt = tdma->tdma_slotcnt;
480 if (update & TDMA_UPDATE_SLOTLEN)
481 ts->tdma_slotlen = slotlen;
482 if (update & TDMA_UPDATE_SLOT)
483 ts->tdma_slot = slot;
484 if (update & TDMA_UPDATE_BINTVAL)
485 ts->tdma_bintval = tdma->tdma_bintval;
486 /* mark beacon to be updated before next xmit */
487 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
489 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
490 "%s: slot %u slotcnt %u slotlen %u us bintval %u\n",
491 __func__, ts->tdma_slot, ts->tdma_slotcnt,
492 ts->tdma_slotlen, ts->tdma_bintval);
495 * Notify driver. Note we can be called before
496 * entering RUN state if we scanned and are
497 * joining an existing bss. In that case do not
498 * call the driver because not all necessary state
499 * has been setup. The next beacon will dtrt.
501 if (vap->iv_state == IEEE80211_S_RUN)
502 vap->iv_ic->ic_tdma_update(ni, tdma, update);
504 * Dispatch join event on first beacon from new master.
506 if (ts->tdma_peer != ni) {
507 if (ts->tdma_peer != NULL)
508 ieee80211_notify_node_leave(vap->iv_bss);
509 ieee80211_notify_node_join(ni, 1);
510 /* NB: no reference, we just use the address */
517 * Process received TDMA parameters.
520 tdma_process_params(struct ieee80211_node *ni, const u_int8_t *ie,
521 int rssi, int nf, const struct ieee80211_frame *wh)
523 struct ieee80211vap *vap = ni->ni_vap;
524 struct ieee80211_tdma_state *ts = vap->iv_tdma;
525 const struct ieee80211_tdma_param *tdma =
526 (const struct ieee80211_tdma_param *) ie;
529 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
530 ("not a tdma vap, caps 0x%x", vap->iv_caps));
532 if (len < sizeof(*tdma) - 2) {
533 IEEE80211_DISCARD_IE(vap,
534 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
535 wh, "tdma", "too short, len %u", len);
536 return IEEE80211_REASON_IE_INVALID;
538 if (tdma->tdma_version != ts->tdma_version) {
539 IEEE80211_DISCARD_IE(vap,
540 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
541 wh, "tdma", "bad version %u (ours %u)",
542 tdma->tdma_version, ts->tdma_version);
543 return IEEE80211_REASON_IE_INVALID;
546 * NB: ideally we'd check against tdma_slotcnt, but that
547 * would require extra effort so do this easy check that
548 * covers the work below; more stringent checks are done
549 * before we make more extensive use of the ie contents.
551 if (tdma->tdma_slot >= TDMA_MAXSLOTS) {
552 IEEE80211_DISCARD_IE(vap,
553 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
554 wh, "tdma", "invalid slot %u", tdma->tdma_slot);
555 return IEEE80211_REASON_IE_INVALID;
558 * Can reach here while scanning, update
559 * operational state only in RUN state.
561 if (vap->iv_state == IEEE80211_S_RUN) {
562 if (tdma->tdma_slot != ts->tdma_slot &&
563 isclr(ts->tdma_inuse, tdma->tdma_slot)) {
564 IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni,
565 "discovered in slot %u", tdma->tdma_slot);
566 setbit(ts->tdma_inuse, tdma->tdma_slot);
567 /* XXX dispatch event only when operating as master */
568 if (ts->tdma_slot == 0)
569 ieee80211_notify_node_join(ni, 1);
571 setbit(ts->tdma_active, tdma->tdma_slot);
572 if (tdma->tdma_slot == ts->tdma_slot-1) {
574 * Slave tsf synchronization to station
575 * just before us in the schedule. The driver
576 * is responsible for copying the timestamp
577 * of the received beacon into our beacon
578 * frame so the sender can calculate round
579 * trip time. We cannot do that here because
580 * we don't know how to update our beacon frame.
582 (void) tdma_update(vap, tdma, ni, 0);
583 /* XXX reschedule swbmiss timer on parameter change */
584 } else if (tdma->tdma_slot == ts->tdma_slot+1) {
587 uint32_t rstamp = (uint32_t) le64toh(rs->tsf);
591 * Use returned timstamp to calculate the
594 memcpy(&tstamp, tdma->tdma_tstamp, 8);
596 /* XXX use only 15 bits of rstamp */
597 rtt = rstamp - (le64toh(tstamp) & 0x7fff);
600 /* XXX hack to quiet normal use */
601 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X,
602 "tdma rtt %5u [rstamp %5u tstamp %llu]\n",
604 (unsigned long long) le64toh(tstamp));
606 } else if (tdma->tdma_slot == ts->tdma_slot &&
607 le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) {
609 * Station using the same slot as us and has
610 * been around longer than us; we must move.
611 * Note this can happen if stations do not
612 * see each other while scanning.
614 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
615 "slot %u collision rxtsf %llu tsf %llu\n",
617 (unsigned long long) le64toh(ni->ni_tstamp.tsf),
618 vap->iv_bss->ni_tstamp.tsf);
619 setbit(ts->tdma_inuse, tdma->tdma_slot);
621 (void) tdma_update(vap, tdma, ni, 1);
628 ieee80211_tdma_getslot(struct ieee80211vap *vap)
630 struct ieee80211_tdma_state *ts = vap->iv_tdma;
632 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
633 ("not a tdma vap, caps 0x%x", vap->iv_caps));
634 return ts->tdma_slot;
638 * Parse a TDMA ie on station join and use it to setup node state.
641 ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie)
643 struct ieee80211vap *vap = ni->ni_vap;
645 if (vap->iv_caps & IEEE80211_C_TDMA) {
646 const struct ieee80211_tdma_param *tdma =
647 (const struct ieee80211_tdma_param *)ie;
648 struct ieee80211_tdma_state *ts = vap->iv_tdma;
650 * Adopt TDMA configuration when joining an
653 setbit(ts->tdma_inuse, tdma->tdma_slot);
654 (void) tdma_update(vap, tdma, ni, 1);
656 * Propagate capabilities based on the local
657 * configuration and the remote station's advertised
658 * capabilities. In particular this permits us to
659 * enable use of QoS to disable ACK's.
661 if ((vap->iv_flags & IEEE80211_F_WME) &&
662 ni->ni_ies.wme_ie != NULL)
663 ni->ni_flags |= IEEE80211_NODE_QOS;
667 #define TDMA_OUI_BYTES 0x00, 0x03, 0x7f
669 * Add a TDMA parameters element to a frame.
672 ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap)
674 #define ADDSHORT(frm, v) do { \
675 frm[0] = (v) & 0xff; \
679 static const struct ieee80211_tdma_param param = {
680 .tdma_id = IEEE80211_ELEMID_VENDOR,
681 .tdma_len = sizeof(struct ieee80211_tdma_param) - 2,
682 .tdma_oui = { TDMA_OUI_BYTES },
683 .tdma_type = TDMA_OUI_TYPE,
684 .tdma_subtype = TDMA_SUBTYPE_PARAM,
685 .tdma_version = TDMA_VERSION,
687 const struct ieee80211_tdma_state *ts = vap->iv_tdma;
690 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
691 ("not a tdma vap, caps 0x%x", vap->iv_caps));
693 memcpy(frm, ¶m, sizeof(param));
694 frm += __offsetof(struct ieee80211_tdma_param, tdma_slot);
695 *frm++ = ts->tdma_slot;
696 *frm++ = ts->tdma_slotcnt;
697 /* NB: convert units to fit in 16-bits */
698 slotlen = ts->tdma_slotlen / 100; /* 100us units */
699 ADDSHORT(frm, slotlen);
700 *frm++ = ts->tdma_bintval;
701 *frm++ = ts->tdma_inuse[0];
702 frm += 10; /* pad+timestamp */
706 #undef TDMA_OUI_BYTES
709 * Update TDMA state at TBTT.
712 ieee80211_tdma_update_beacon(struct ieee80211vap *vap,
713 struct ieee80211_beacon_offsets *bo)
715 struct ieee80211_tdma_state *ts = vap->iv_tdma;
717 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
718 ("not a tdma vap, caps 0x%x", vap->iv_caps));
720 if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) {
721 (void) ieee80211_add_tdma(bo->bo_tdma, vap);
722 clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
724 if (ts->tdma_slot != 0) /* only on master */
726 if (ts->tdma_count <= 0) {
728 * Time to update the mask of active/inuse stations.
729 * We track stations that we've received a beacon
730 * frame from and update this mask periodically.
731 * This allows us to miss a few beacons before marking
732 * a slot free for re-use.
734 ts->tdma_inuse[0] = ts->tdma_active[0];
735 ts->tdma_active[0] = 0x01;
736 /* update next time 'round */
737 /* XXX use notify framework */
738 setbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
739 /* NB: use s/w beacon miss threshold; may be too high */
740 ts->tdma_count = vap->iv_bmissthreshold-1;
746 tdma_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
748 struct ieee80211_tdma_state *ts = vap->iv_tdma;
750 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
753 switch (ireq->i_type) {
754 case IEEE80211_IOC_TDMA_SLOT:
755 ireq->i_val = ts->tdma_slot;
757 case IEEE80211_IOC_TDMA_SLOTCNT:
758 ireq->i_val = ts->tdma_slotcnt;
760 case IEEE80211_IOC_TDMA_SLOTLEN:
761 ireq->i_val = ts->tdma_slotlen;
763 case IEEE80211_IOC_TDMA_BINTERVAL:
764 ireq->i_val = ts->tdma_bintval;
771 IEEE80211_IOCTL_GET(tdma, tdma_ioctl_get80211);
774 tdma_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
776 struct ieee80211_tdma_state *ts = vap->iv_tdma;
778 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
781 switch (ireq->i_type) {
782 case IEEE80211_IOC_TDMA_SLOT:
783 if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt))
785 if (ireq->i_val != ts->tdma_slot) {
786 ts->tdma_slot = ireq->i_val;
790 case IEEE80211_IOC_TDMA_SLOTCNT:
791 if (!TDMA_SLOTCNT_VALID(ireq->i_val))
793 if (ireq->i_val != ts->tdma_slotcnt) {
794 ts->tdma_slotcnt = ireq->i_val;
798 case IEEE80211_IOC_TDMA_SLOTLEN:
801 * 150 insures at least 1/8 TU
802 * 0xfffff is the max duration for bursting
803 * (implict by way of 16-bit data type for i_val)
805 if (!TDMA_SLOTLEN_VALID(ireq->i_val))
807 if (ireq->i_val != ts->tdma_slotlen) {
808 ts->tdma_slotlen = ireq->i_val;
812 case IEEE80211_IOC_TDMA_BINTERVAL:
813 if (!TDMA_BINTVAL_VALID(ireq->i_val))
815 if (ireq->i_val != ts->tdma_bintval) {
816 ts->tdma_bintval = ireq->i_val;
825 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
828 IEEE80211_IOCTL_SET(tdma, tdma_ioctl_set80211);
830 #endif /* IEEE80211_SUPPORT_TDMA */