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),
348 vap->iv_stats.is_rx_mgtdiscard++;
351 if (ni == vap->iv_bss &&
352 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
354 * Fake up a node for this newly
355 * discovered member of the IBSS.
357 ni = ieee80211_add_neighbor(vap, wh, &scan);
359 /* NB: stat kept for alloc failure */
364 * Check for state updates.
366 if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) {
368 * Count frame now that we know it's to be processed.
370 vap->iv_stats.is_rx_beacon++;
371 IEEE80211_NODE_STAT(ni, rx_beacons);
373 * Record tsf of last beacon. NB: this must be
374 * done before calling tdma_process_params
375 * as deeper routines reference it.
377 memcpy(&ni->ni_tstamp.data, scan.tstamp,
378 sizeof(ni->ni_tstamp.data));
380 * Count beacon frame for s/w bmiss handling.
382 vap->iv_swbmiss_count++;
384 * Process tdma ie. The contents are used to sync
385 * the slot timing, reconfigure the bss, etc.
387 (void) tdma_process_params(ni, scan.tdma, rssi, nf, wh);
391 * NB: defer remaining work to the adhoc code; this causes
392 * 2x parsing of the frame but should happen infrequently
395 ts->tdma_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
399 * Update TDMA state on receipt of a beacon frame with
400 * a TDMA information element. The sender's identity
401 * is provided so we can track who our peer is. If pickslot
402 * is non-zero we scan the slot allocation state in the ie
403 * to locate a free slot for our use.
406 tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma,
407 struct ieee80211_node *ni, int pickslot)
409 struct ieee80211_tdma_state *ts = vap->iv_tdma;
410 int slot, slotlen, update;
412 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
413 ("not a tdma vap, caps 0x%x", vap->iv_caps));
416 if (tdma->tdma_slotcnt != ts->tdma_slotcnt) {
417 if (!TDMA_SLOTCNT_VALID(tdma->tdma_slotcnt)) {
418 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
419 printf("%s: bad slot cnt %u\n",
420 __func__, tdma->tdma_slotcnt);
423 update |= TDMA_UPDATE_SLOTCNT;
425 slotlen = le16toh(tdma->tdma_slotlen) * 100;
426 if (slotlen != ts->tdma_slotlen) {
427 if (!TDMA_SLOTLEN_VALID(slotlen)) {
428 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
429 printf("%s: bad slot len %u\n",
433 update |= TDMA_UPDATE_SLOTLEN;
435 if (tdma->tdma_bintval != ts->tdma_bintval) {
436 if (!TDMA_BINTVAL_VALID(tdma->tdma_bintval)) {
437 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
438 printf("%s: bad beacon interval %u\n",
439 __func__, tdma->tdma_bintval);
442 update |= TDMA_UPDATE_BINTVAL;
444 slot = ts->tdma_slot;
447 * Pick unoccupied slot. Note we never choose slot 0.
449 for (slot = tdma->tdma_slotcnt-1; slot > 0; slot--)
450 if (isclr(tdma->tdma_inuse, slot))
453 printf("%s: no free slot, slotcnt %u inuse: 0x%x\n",
454 __func__, tdma->tdma_slotcnt,
455 tdma->tdma_inuse[0]);
456 /* XXX need to do something better */
459 if (slot != ts->tdma_slot)
460 update |= TDMA_UPDATE_SLOT;
462 if (ni != ts->tdma_peer) {
463 /* update everything */
464 update = TDMA_UPDATE_SLOT
465 | TDMA_UPDATE_SLOTCNT
466 | TDMA_UPDATE_SLOTLEN
467 | TDMA_UPDATE_BINTVAL;
472 * New/changed parameters; update runtime state.
474 /* XXX overwrites user parameters */
475 if (update & TDMA_UPDATE_SLOTCNT)
476 ts->tdma_slotcnt = tdma->tdma_slotcnt;
477 if (update & TDMA_UPDATE_SLOTLEN)
478 ts->tdma_slotlen = slotlen;
479 if (update & TDMA_UPDATE_SLOT)
480 ts->tdma_slot = slot;
481 if (update & TDMA_UPDATE_BINTVAL)
482 ts->tdma_bintval = tdma->tdma_bintval;
483 /* mark beacon to be updated before next xmit */
484 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
486 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
487 "%s: slot %u slotcnt %u slotlen %u us bintval %u\n",
488 __func__, ts->tdma_slot, ts->tdma_slotcnt,
489 ts->tdma_slotlen, ts->tdma_bintval);
492 * Notify driver. Note we can be called before
493 * entering RUN state if we scanned and are
494 * joining an existing bss. In that case do not
495 * call the driver because not all necessary state
496 * has been setup. The next beacon will dtrt.
498 if (vap->iv_state == IEEE80211_S_RUN)
499 vap->iv_ic->ic_tdma_update(ni, tdma, update);
501 * Dispatch join event on first beacon from new master.
503 if (ts->tdma_peer != ni) {
504 if (ts->tdma_peer != NULL)
505 ieee80211_notify_node_leave(vap->iv_bss);
506 ieee80211_notify_node_join(ni, 1);
507 /* NB: no reference, we just use the address */
514 * Process received TDMA parameters.
517 tdma_process_params(struct ieee80211_node *ni, const u_int8_t *ie,
518 int rssi, int nf, const struct ieee80211_frame *wh)
520 struct ieee80211vap *vap = ni->ni_vap;
521 struct ieee80211_tdma_state *ts = vap->iv_tdma;
522 const struct ieee80211_tdma_param *tdma =
523 (const struct ieee80211_tdma_param *) ie;
526 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
527 ("not a tdma vap, caps 0x%x", vap->iv_caps));
529 if (len < sizeof(*tdma) - 2) {
530 IEEE80211_DISCARD_IE(vap,
531 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
532 wh, "tdma", "too short, len %u", len);
533 return IEEE80211_REASON_IE_INVALID;
535 if (tdma->tdma_version != ts->tdma_version) {
536 IEEE80211_DISCARD_IE(vap,
537 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
538 wh, "tdma", "bad version %u (ours %u)",
539 tdma->tdma_version, ts->tdma_version);
540 return IEEE80211_REASON_IE_INVALID;
543 * NB: ideally we'd check against tdma_slotcnt, but that
544 * would require extra effort so do this easy check that
545 * covers the work below; more stringent checks are done
546 * before we make more extensive use of the ie contents.
548 if (tdma->tdma_slot >= TDMA_MAXSLOTS) {
549 IEEE80211_DISCARD_IE(vap,
550 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
551 wh, "tdma", "invalid slot %u", tdma->tdma_slot);
552 return IEEE80211_REASON_IE_INVALID;
555 * Can reach here while scanning, update
556 * operational state only in RUN state.
558 if (vap->iv_state == IEEE80211_S_RUN) {
559 if (tdma->tdma_slot != ts->tdma_slot &&
560 isclr(ts->tdma_inuse, tdma->tdma_slot)) {
561 IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni,
562 "discovered in slot %u", tdma->tdma_slot);
563 setbit(ts->tdma_inuse, tdma->tdma_slot);
564 /* XXX dispatch event only when operating as master */
565 if (ts->tdma_slot == 0)
566 ieee80211_notify_node_join(ni, 1);
568 setbit(ts->tdma_active, tdma->tdma_slot);
569 if (tdma->tdma_slot == ts->tdma_slot-1) {
571 * Slave tsf synchronization to station
572 * just before us in the schedule. The driver
573 * is responsible for copying the timestamp
574 * of the received beacon into our beacon
575 * frame so the sender can calculate round
576 * trip time. We cannot do that here because
577 * we don't know how to update our beacon frame.
579 (void) tdma_update(vap, tdma, ni, 0);
580 /* XXX reschedule swbmiss timer on parameter change */
581 } else if (tdma->tdma_slot == ts->tdma_slot+1) {
584 uint32_t rstamp = (uint32_t) le64toh(rs->tsf);
588 * Use returned timstamp to calculate the
591 memcpy(&tstamp, tdma->tdma_tstamp, 8);
593 /* XXX use only 15 bits of rstamp */
594 rtt = rstamp - (le64toh(tstamp) & 0x7fff);
597 /* XXX hack to quiet normal use */
598 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X,
599 "tdma rtt %5u [rstamp %5u tstamp %llu]\n",
601 (unsigned long long) le64toh(tstamp));
603 } else if (tdma->tdma_slot == ts->tdma_slot &&
604 le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) {
606 * Station using the same slot as us and has
607 * been around longer than us; we must move.
608 * Note this can happen if stations do not
609 * see each other while scanning.
611 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
612 "slot %u collision rxtsf %llu tsf %llu\n",
614 (unsigned long long) le64toh(ni->ni_tstamp.tsf),
615 vap->iv_bss->ni_tstamp.tsf);
616 setbit(ts->tdma_inuse, tdma->tdma_slot);
618 (void) tdma_update(vap, tdma, ni, 1);
625 ieee80211_tdma_getslot(struct ieee80211vap *vap)
627 struct ieee80211_tdma_state *ts = vap->iv_tdma;
629 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
630 ("not a tdma vap, caps 0x%x", vap->iv_caps));
631 return ts->tdma_slot;
635 * Parse a TDMA ie on station join and use it to setup node state.
638 ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie)
640 struct ieee80211vap *vap = ni->ni_vap;
642 if (vap->iv_caps & IEEE80211_C_TDMA) {
643 const struct ieee80211_tdma_param *tdma =
644 (const struct ieee80211_tdma_param *)ie;
645 struct ieee80211_tdma_state *ts = vap->iv_tdma;
647 * Adopt TDMA configuration when joining an
650 setbit(ts->tdma_inuse, tdma->tdma_slot);
651 (void) tdma_update(vap, tdma, ni, 1);
653 * Propagate capabilities based on the local
654 * configuration and the remote station's advertised
655 * capabilities. In particular this permits us to
656 * enable use of QoS to disable ACK's.
658 if ((vap->iv_flags & IEEE80211_F_WME) &&
659 ni->ni_ies.wme_ie != NULL)
660 ni->ni_flags |= IEEE80211_NODE_QOS;
664 #define TDMA_OUI_BYTES 0x00, 0x03, 0x7f
666 * Add a TDMA parameters element to a frame.
669 ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap)
671 #define ADDSHORT(frm, v) do { \
672 frm[0] = (v) & 0xff; \
676 static const struct ieee80211_tdma_param param = {
677 .tdma_id = IEEE80211_ELEMID_VENDOR,
678 .tdma_len = sizeof(struct ieee80211_tdma_param) - 2,
679 .tdma_oui = { TDMA_OUI_BYTES },
680 .tdma_type = TDMA_OUI_TYPE,
681 .tdma_subtype = TDMA_SUBTYPE_PARAM,
682 .tdma_version = TDMA_VERSION,
684 const struct ieee80211_tdma_state *ts = vap->iv_tdma;
687 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
688 ("not a tdma vap, caps 0x%x", vap->iv_caps));
690 memcpy(frm, ¶m, sizeof(param));
691 frm += __offsetof(struct ieee80211_tdma_param, tdma_slot);
692 *frm++ = ts->tdma_slot;
693 *frm++ = ts->tdma_slotcnt;
694 /* NB: convert units to fit in 16-bits */
695 slotlen = ts->tdma_slotlen / 100; /* 100us units */
696 ADDSHORT(frm, slotlen);
697 *frm++ = ts->tdma_bintval;
698 *frm++ = ts->tdma_inuse[0];
699 frm += 10; /* pad+timestamp */
703 #undef TDMA_OUI_BYTES
706 * Update TDMA state at TBTT.
709 ieee80211_tdma_update_beacon(struct ieee80211vap *vap,
710 struct ieee80211_beacon_offsets *bo)
712 struct ieee80211_tdma_state *ts = vap->iv_tdma;
714 KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
715 ("not a tdma vap, caps 0x%x", vap->iv_caps));
717 if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) {
718 (void) ieee80211_add_tdma(bo->bo_tdma, vap);
719 clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
721 if (ts->tdma_slot != 0) /* only on master */
723 if (ts->tdma_count <= 0) {
725 * Time to update the mask of active/inuse stations.
726 * We track stations that we've received a beacon
727 * frame from and update this mask periodically.
728 * This allows us to miss a few beacons before marking
729 * a slot free for re-use.
731 ts->tdma_inuse[0] = ts->tdma_active[0];
732 ts->tdma_active[0] = 0x01;
733 /* update next time 'round */
734 /* XXX use notify framework */
735 setbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
736 /* NB: use s/w beacon miss threshold; may be too high */
737 ts->tdma_count = vap->iv_bmissthreshold-1;
743 tdma_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
745 struct ieee80211_tdma_state *ts = vap->iv_tdma;
747 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
750 switch (ireq->i_type) {
751 case IEEE80211_IOC_TDMA_SLOT:
752 ireq->i_val = ts->tdma_slot;
754 case IEEE80211_IOC_TDMA_SLOTCNT:
755 ireq->i_val = ts->tdma_slotcnt;
757 case IEEE80211_IOC_TDMA_SLOTLEN:
758 ireq->i_val = ts->tdma_slotlen;
760 case IEEE80211_IOC_TDMA_BINTERVAL:
761 ireq->i_val = ts->tdma_bintval;
768 IEEE80211_IOCTL_GET(tdma, tdma_ioctl_get80211);
771 tdma_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
773 struct ieee80211_tdma_state *ts = vap->iv_tdma;
775 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
778 switch (ireq->i_type) {
779 case IEEE80211_IOC_TDMA_SLOT:
780 if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt))
782 if (ireq->i_val != ts->tdma_slot) {
783 ts->tdma_slot = ireq->i_val;
787 case IEEE80211_IOC_TDMA_SLOTCNT:
788 if (!TDMA_SLOTCNT_VALID(ireq->i_val))
790 if (ireq->i_val != ts->tdma_slotcnt) {
791 ts->tdma_slotcnt = ireq->i_val;
795 case IEEE80211_IOC_TDMA_SLOTLEN:
798 * 150 insures at least 1/8 TU
799 * 0xfffff is the max duration for bursting
800 * (implict by way of 16-bit data type for i_val)
802 if (!TDMA_SLOTLEN_VALID(ireq->i_val))
804 if (ireq->i_val != ts->tdma_slotlen) {
805 ts->tdma_slotlen = ireq->i_val;
809 case IEEE80211_IOC_TDMA_BINTERVAL:
810 if (!TDMA_BINTVAL_VALID(ireq->i_val))
812 if (ireq->i_val != ts->tdma_bintval) {
813 ts->tdma_bintval = ireq->i_val;
822 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
825 IEEE80211_IOCTL_SET(tdma, tdma_ioctl_set80211);
827 #endif /* IEEE80211_SUPPORT_TDMA */