1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 /*
30 * IEEE 802.11 power save support.
31 */
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38
39 #include <sys/socket.h>
40
41 #include <net/if.h>
42 #include <net/if_var.h>
43 #include <net/if_media.h>
44 #include <net/ethernet.h>
45
46 #include <net80211/ieee80211_var.h>
47
48 #include <net/bpf.h>
49
50 static void ieee80211_update_ps(struct ieee80211vap *, int);
51 static int ieee80211_set_tim(struct ieee80211_node *, int);
52
53 static MALLOC_DEFINE(M_80211_POWER, "80211power", "802.11 power save state");
54
55 void
ieee80211_power_attach(struct ieee80211com * ic)56 ieee80211_power_attach(struct ieee80211com *ic)
57 {
58 }
59
60 void
ieee80211_power_detach(struct ieee80211com * ic)61 ieee80211_power_detach(struct ieee80211com *ic)
62 {
63 }
64
65 void
ieee80211_power_vattach(struct ieee80211vap * vap)66 ieee80211_power_vattach(struct ieee80211vap *vap)
67 {
68 if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
69 vap->iv_opmode == IEEE80211_M_IBSS) {
70 /* NB: driver should override */
71 vap->iv_update_ps = ieee80211_update_ps;
72 vap->iv_set_tim = ieee80211_set_tim;
73 }
74 vap->iv_node_ps = ieee80211_node_pwrsave;
75 vap->iv_sta_ps = ieee80211_sta_pwrsave;
76 }
77
78 void
ieee80211_power_latevattach(struct ieee80211vap * vap)79 ieee80211_power_latevattach(struct ieee80211vap *vap)
80 {
81 /*
82 * Allocate these only if needed. Beware that we
83 * know adhoc mode doesn't support ATIM yet...
84 */
85 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
86 vap->iv_tim_len = howmany(vap->iv_max_aid,8) * sizeof(uint8_t);
87 vap->iv_tim_bitmap = (uint8_t *) IEEE80211_MALLOC(vap->iv_tim_len,
88 M_80211_POWER,
89 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
90 if (vap->iv_tim_bitmap == NULL) {
91 printf("%s: no memory for TIM bitmap!\n", __func__);
92 /* XXX good enough to keep from crashing? */
93 vap->iv_tim_len = 0;
94 }
95 }
96 }
97
98 void
ieee80211_power_vdetach(struct ieee80211vap * vap)99 ieee80211_power_vdetach(struct ieee80211vap *vap)
100 {
101 if (vap->iv_tim_bitmap != NULL) {
102 IEEE80211_FREE(vap->iv_tim_bitmap, M_80211_POWER);
103 vap->iv_tim_bitmap = NULL;
104 }
105 }
106
107 void
ieee80211_psq_init(struct ieee80211_psq * psq,const char * name)108 ieee80211_psq_init(struct ieee80211_psq *psq, const char *name)
109 {
110 memset(psq, 0, sizeof(*psq));
111 psq->psq_maxlen = IEEE80211_PS_MAX_QUEUE;
112 IEEE80211_PSQ_INIT(psq, name); /* OS-dependent setup */
113 }
114
115 void
ieee80211_psq_cleanup(struct ieee80211_psq * psq)116 ieee80211_psq_cleanup(struct ieee80211_psq *psq)
117 {
118 #if 0
119 psq_drain(psq); /* XXX should not be needed? */
120 #else
121 KASSERT(psq->psq_len == 0, ("%d frames on ps q", psq->psq_len));
122 #endif
123 IEEE80211_PSQ_DESTROY(psq); /* OS-dependent cleanup */
124 }
125
126 /*
127 * Return the highest priority frame in the ps queue.
128 */
129 struct mbuf *
ieee80211_node_psq_dequeue(struct ieee80211_node * ni,int * qlen)130 ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen)
131 {
132 struct ieee80211_psq *psq = &ni->ni_psq;
133 struct ieee80211_psq_head *qhead;
134 struct mbuf *m;
135
136 IEEE80211_PSQ_LOCK(psq);
137 qhead = &psq->psq_head[0];
138 again:
139 if ((m = qhead->head) != NULL) {
140 if ((qhead->head = m->m_nextpkt) == NULL)
141 qhead->tail = NULL;
142 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
143 qhead->len--;
144 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
145 psq->psq_len--;
146 m->m_nextpkt = NULL;
147 }
148 if (m == NULL && qhead == &psq->psq_head[0]) {
149 /* Algol-68 style for loop */
150 qhead = &psq->psq_head[1];
151 goto again;
152 }
153 if (qlen != NULL)
154 *qlen = psq->psq_len;
155 IEEE80211_PSQ_UNLOCK(psq);
156 return m;
157 }
158
159 /*
160 * Reclaim an mbuf from the ps q. If marked with M_ENCAP
161 * we assume there is a node reference that must be relcaimed.
162 */
163 static void
psq_mfree(struct mbuf * m)164 psq_mfree(struct mbuf *m)
165 {
166 if (m->m_flags & M_ENCAP) {
167 struct ieee80211_node *ni = (void *) m->m_pkthdr.rcvif;
168 ieee80211_free_node(ni);
169 }
170 m->m_nextpkt = NULL;
171 m_freem(m);
172 }
173
174 /*
175 * Clear any frames queued in the power save queue.
176 * The number of frames that were present is returned.
177 */
178 static int
psq_drain(struct ieee80211_psq * psq)179 psq_drain(struct ieee80211_psq *psq)
180 {
181 struct ieee80211_psq_head *qhead;
182 struct mbuf *m;
183 int qlen;
184
185 IEEE80211_PSQ_LOCK(psq);
186 qlen = psq->psq_len;
187 qhead = &psq->psq_head[0];
188 again:
189 while ((m = qhead->head) != NULL) {
190 qhead->head = m->m_nextpkt;
191 psq_mfree(m);
192 }
193 qhead->tail = NULL;
194 qhead->len = 0;
195 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
196 qhead = &psq->psq_head[1];
197 goto again;
198 }
199 psq->psq_len = 0;
200 IEEE80211_PSQ_UNLOCK(psq);
201
202 return qlen;
203 }
204
205 /*
206 * Clear any frames queued in the power save queue.
207 * The number of frames that were present is returned.
208 */
209 int
ieee80211_node_psq_drain(struct ieee80211_node * ni)210 ieee80211_node_psq_drain(struct ieee80211_node *ni)
211 {
212 return psq_drain(&ni->ni_psq);
213 }
214
215 /*
216 * Age frames on the power save queue. The aging interval is
217 * 4 times the listen interval specified by the station. This
218 * number is factored into the age calculations when the frame
219 * is placed on the queue. We store ages as time differences
220 * so we can check and/or adjust only the head of the list.
221 * If a frame's age exceeds the threshold then discard it.
222 * The number of frames discarded is returned so the caller
223 * can check if it needs to adjust the tim.
224 */
225 int
ieee80211_node_psq_age(struct ieee80211_node * ni)226 ieee80211_node_psq_age(struct ieee80211_node *ni)
227 {
228 struct ieee80211_psq *psq = &ni->ni_psq;
229 int discard = 0;
230
231 if (psq->psq_len != 0) {
232 #ifdef IEEE80211_DEBUG
233 struct ieee80211vap *vap = ni->ni_vap;
234 #endif
235 struct ieee80211_psq_head *qhead;
236 struct mbuf *m;
237
238 IEEE80211_PSQ_LOCK(psq);
239 qhead = &psq->psq_head[0];
240 again:
241 while ((m = qhead->head) != NULL &&
242 M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
243 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
244 "discard frame, age %u", M_AGE_GET(m));
245 if ((qhead->head = m->m_nextpkt) == NULL)
246 qhead->tail = NULL;
247 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
248 qhead->len--;
249 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
250 psq->psq_len--;
251 psq_mfree(m);
252 discard++;
253 }
254 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
255 qhead = &psq->psq_head[1];
256 goto again;
257 }
258 if (m != NULL)
259 M_AGE_SUB(m, IEEE80211_INACT_WAIT);
260 IEEE80211_PSQ_UNLOCK(psq);
261
262 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
263 "discard %u frames for age", discard);
264 IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
265 }
266 return discard;
267 }
268
269 /*
270 * Handle a change in the PS station occupancy.
271 */
272 static void
ieee80211_update_ps(struct ieee80211vap * vap,int nsta)273 ieee80211_update_ps(struct ieee80211vap *vap, int nsta)
274 {
275
276 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
277 vap->iv_opmode == IEEE80211_M_IBSS,
278 ("operating mode %u", vap->iv_opmode));
279 }
280
281 /*
282 * Indicate whether there are frames queued for a station in power-save mode.
283 */
284 static int
ieee80211_set_tim(struct ieee80211_node * ni,int set)285 ieee80211_set_tim(struct ieee80211_node *ni, int set)
286 {
287 struct ieee80211vap *vap = ni->ni_vap;
288 struct ieee80211com *ic = ni->ni_ic;
289 uint16_t aid;
290 int changed;
291
292 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
293 vap->iv_opmode == IEEE80211_M_IBSS,
294 ("operating mode %u", vap->iv_opmode));
295
296 aid = IEEE80211_AID(ni->ni_associd);
297 KASSERT(aid < vap->iv_max_aid,
298 ("bogus aid %u, max %u", aid, vap->iv_max_aid));
299
300 IEEE80211_LOCK(ic);
301 changed = (set != (isset(vap->iv_tim_bitmap, aid) != 0));
302 if (changed) {
303 if (set) {
304 setbit(vap->iv_tim_bitmap, aid);
305 vap->iv_ps_pending++;
306 } else {
307 clrbit(vap->iv_tim_bitmap, aid);
308 vap->iv_ps_pending--;
309 }
310 /* NB: we know vap is in RUN state so no need to check */
311 vap->iv_update_beacon(vap, IEEE80211_BEACON_TIM);
312 }
313 IEEE80211_UNLOCK(ic);
314
315 return changed;
316 }
317
318 /*
319 * Save an outbound packet for a node in power-save sleep state.
320 * The new packet is placed on the node's saved queue, and the TIM
321 * is changed, if necessary.
322 */
323 int
ieee80211_pwrsave(struct ieee80211_node * ni,struct mbuf * m)324 ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
325 {
326 struct ieee80211_psq *psq = &ni->ni_psq;
327 struct ieee80211vap *vap = ni->ni_vap;
328 struct ieee80211com *ic = ni->ni_ic;
329 struct ieee80211_psq_head *qhead;
330 int qlen, age;
331
332 IEEE80211_PSQ_LOCK(psq);
333 if (psq->psq_len >= psq->psq_maxlen) {
334 psq->psq_drops++;
335 IEEE80211_PSQ_UNLOCK(psq);
336 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
337 "pwr save q overflow, drops %d (size %d)",
338 psq->psq_drops, psq->psq_len);
339 #ifdef IEEE80211_DEBUG
340 if (ieee80211_msg_dumppkts(vap))
341 ieee80211_dump_pkt(ni->ni_ic, mtod(m, caddr_t),
342 m->m_len, -1, -1);
343 #endif
344 psq_mfree(m);
345 return ENOSPC;
346 }
347 /*
348 * Tag the frame with it's expiry time and insert it in
349 * the appropriate queue. The aging interval is 4 times
350 * the listen interval specified by the station. Frames
351 * that sit around too long are reclaimed using this
352 * information.
353 */
354 /* TU -> secs. XXX handle overflow? */
355 age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
356 /*
357 * Encapsulated frames go on the high priority queue,
358 * other stuff goes on the low priority queue. We use
359 * this to order frames returned out of the driver
360 * ahead of frames we collect in ieee80211_start.
361 */
362 if (m->m_flags & M_ENCAP)
363 qhead = &psq->psq_head[0];
364 else
365 qhead = &psq->psq_head[1];
366 if (qhead->tail == NULL) {
367 struct mbuf *mh;
368
369 qhead->head = m;
370 /*
371 * Take care to adjust age when inserting the first
372 * frame of a queue and the other queue already has
373 * frames. We need to preserve the age difference
374 * relationship so ieee80211_node_psq_age works.
375 */
376 if (qhead == &psq->psq_head[1]) {
377 mh = psq->psq_head[0].head;
378 if (mh != NULL)
379 age-= M_AGE_GET(mh);
380 } else {
381 mh = psq->psq_head[1].head;
382 if (mh != NULL) {
383 int nage = M_AGE_GET(mh) - age;
384 /* XXX is clamping to zero good 'nuf? */
385 M_AGE_SET(mh, nage < 0 ? 0 : nage);
386 }
387 }
388 } else {
389 qhead->tail->m_nextpkt = m;
390 age -= M_AGE_GET(qhead->head);
391 }
392 KASSERT(age >= 0, ("age %d", age));
393 M_AGE_SET(m, age);
394 m->m_nextpkt = NULL;
395 qhead->tail = m;
396 qhead->len++;
397 qlen = ++(psq->psq_len);
398 IEEE80211_PSQ_UNLOCK(psq);
399
400 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
401 "save frame with age %d, %u now queued", age, qlen);
402
403 if (qlen == 1 && vap->iv_set_tim != NULL)
404 vap->iv_set_tim(ni, 1);
405
406 return 0;
407 }
408
409 /*
410 * Move frames from the ps q to the vap's send queue
411 * and/or the driver's send queue; and kick the start
412 * method for each, as appropriate. Note we're careful
413 * to preserve packet ordering here.
414 */
415 static void
pwrsave_flushq(struct ieee80211_node * ni)416 pwrsave_flushq(struct ieee80211_node *ni)
417 {
418 struct ieee80211_psq *psq = &ni->ni_psq;
419 struct ieee80211com *ic = ni->ni_ic;
420 struct ieee80211vap *vap = ni->ni_vap;
421 struct ieee80211_psq_head *qhead;
422 struct mbuf *parent_q = NULL, *ifp_q = NULL;
423 struct mbuf *m;
424
425 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
426 "flush ps queue, %u packets queued", psq->psq_len);
427
428 IEEE80211_PSQ_LOCK(psq);
429 qhead = &psq->psq_head[0]; /* 802.11 frames */
430 if (qhead->head != NULL) {
431 /* XXX could dispatch through vap and check M_ENCAP */
432 /* XXX need different driver interface */
433 /* XXX bypasses q max and OACTIVE */
434 parent_q = qhead->head;
435 qhead->head = qhead->tail = NULL;
436 qhead->len = 0;
437 }
438
439 qhead = &psq->psq_head[1]; /* 802.3 frames */
440 if (qhead->head != NULL) {
441 /* XXX need different driver interface */
442 /* XXX bypasses q max and OACTIVE */
443 ifp_q = qhead->head;
444 qhead->head = qhead->tail = NULL;
445 qhead->len = 0;
446 }
447 psq->psq_len = 0;
448 IEEE80211_PSQ_UNLOCK(psq);
449
450 /* NB: do this outside the psq lock */
451 /* XXX packets might get reordered if parent is OACTIVE */
452 /* parent frames, should be encapsulated */
453 while (parent_q != NULL) {
454 m = parent_q;
455 parent_q = m->m_nextpkt;
456 m->m_nextpkt = NULL;
457 /* must be encapsulated */
458 KASSERT((m->m_flags & M_ENCAP),
459 ("%s: parentq with non-M_ENCAP frame!\n",
460 __func__));
461 (void) ieee80211_parent_xmitpkt(ic, m);
462 }
463
464 /* VAP frames, aren't encapsulated */
465 while (ifp_q != NULL) {
466 m = ifp_q;
467 ifp_q = m->m_nextpkt;
468 m->m_nextpkt = NULL;
469 KASSERT((!(m->m_flags & M_ENCAP)),
470 ("%s: vapq with M_ENCAP frame!\n", __func__));
471 (void) ieee80211_vap_xmitpkt(vap, m);
472 }
473 }
474
475 /*
476 * Handle station power-save state change.
477 */
478 void
ieee80211_node_pwrsave(struct ieee80211_node * ni,int enable)479 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
480 {
481 struct ieee80211vap *vap = ni->ni_vap;
482 int update;
483
484 update = 0;
485 if (enable) {
486 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
487 vap->iv_ps_sta++;
488 update = 1;
489 }
490 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
491 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
492 "power save mode on, %u sta's in ps mode", vap->iv_ps_sta);
493
494 if (update)
495 vap->iv_update_ps(vap, vap->iv_ps_sta);
496 } else {
497 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
498 vap->iv_ps_sta--;
499 update = 1;
500 }
501 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
502 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
503 "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
504
505 /* NB: order here is intentional so TIM is clear before flush */
506 if (vap->iv_set_tim != NULL)
507 vap->iv_set_tim(ni, 0);
508 if (update) {
509 /* NB if no sta's in ps, driver should flush mc q */
510 vap->iv_update_ps(vap, vap->iv_ps_sta);
511 }
512 if (ni->ni_psq.psq_len != 0)
513 pwrsave_flushq(ni);
514 }
515 }
516
517 /*
518 * Handle power-save state change in station mode.
519 */
520 void
ieee80211_sta_pwrsave(struct ieee80211vap * vap,int enable)521 ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
522 {
523 struct ieee80211_node *ni = vap->iv_bss;
524
525 if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
526 return;
527
528 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
529 "sta power save mode %s", enable ? "on" : "off");
530 if (!enable) {
531 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
532 ieee80211_send_nulldata(ieee80211_ref_node(ni));
533 /*
534 * Flush any queued frames; we can do this immediately
535 * because we know they'll be queued behind the null
536 * data frame we send the ap.
537 * XXX can we use a data frame to take us out of ps?
538 */
539 if (ni->ni_psq.psq_len != 0)
540 pwrsave_flushq(ni);
541 } else {
542 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
543 ieee80211_send_nulldata(ieee80211_ref_node(ni));
544 }
545 }
546
547 /*
548 * Handle being notified that we have data available for us in a TIM/ATIM.
549 *
550 * This may schedule a transition from _SLEEP -> _RUN if it's appropriate.
551 *
552 * In STA mode, we may have put to sleep during scan and need to be dragged
553 * back out of powersave mode.
554 */
555 void
ieee80211_sta_tim_notify(struct ieee80211vap * vap,int set)556 ieee80211_sta_tim_notify(struct ieee80211vap *vap, int set)
557 {
558 struct ieee80211com *ic = vap->iv_ic;
559
560 /*
561 * Schedule the driver state change. It'll happen at some point soon.
562 * Since the hardware shouldn't know that we're running just yet
563 * (and thus tell the peer that we're awake before we actually wake
564 * up said hardware), we leave the actual node state transition
565 * up to the transition to RUN.
566 *
567 * XXX TODO: verify that the transition to RUN will wake up the
568 * BSS node!
569 */
570 IEEE80211_LOCK(vap->iv_ic);
571 if (set == 1 && vap->iv_state == IEEE80211_S_SLEEP) {
572 ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
573 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
574 "%s: TIM=%d; wakeup\n", __func__, set);
575 } else if ((set == 1) && (ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN)) {
576 /*
577 * XXX only do this if we're in RUN state?
578 */
579 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
580 "%s: wake up from bgscan vap sleep\n",
581 __func__);
582 /*
583 * We may be in BGSCAN mode - this means the VAP is in STA
584 * mode powersave. If it is, we need to wake it up so we
585 * can process outbound traffic.
586 */
587 vap->iv_sta_ps(vap, 0);
588 }
589 IEEE80211_UNLOCK(vap->iv_ic);
590 }
591
592 /*
593 * Timer check on whether the VAP has had any transmit activity.
594 *
595 * This may schedule a transition from _RUN -> _SLEEP if it's appropriate.
596 */
597 void
ieee80211_sta_ps_timer_check(struct ieee80211vap * vap)598 ieee80211_sta_ps_timer_check(struct ieee80211vap *vap)
599 {
600 struct ieee80211com *ic = vap->iv_ic;
601
602 /* XXX lock assert */
603
604 /* For no, only do this in STA mode */
605 if (! (vap->iv_caps & IEEE80211_C_SWSLEEP))
606 goto out;
607
608 if (vap->iv_opmode != IEEE80211_M_STA)
609 goto out;
610
611 /* If we're not at run state, bail */
612 if (vap->iv_state != IEEE80211_S_RUN)
613 goto out;
614
615 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
616 "%s: lastdata=%llu, ticks=%llu\n",
617 __func__, (unsigned long long) ic->ic_lastdata,
618 (unsigned long long) ticks);
619
620 /* If powersave is disabled on the VAP, don't bother */
621 if (! (vap->iv_flags & IEEE80211_F_PMGTON))
622 goto out;
623
624 /* If we've done any data within our idle interval, bail */
625 /* XXX hard-coded to one second for now, ew! */
626 if (ieee80211_time_after(ic->ic_lastdata + 500, ticks))
627 goto out;
628
629 /*
630 * Signify we're going into power save and transition the
631 * node to powersave.
632 */
633 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
634 vap->iv_sta_ps(vap, 1);
635
636 /*
637 * XXX The driver has to handle the fact that we're going
638 * to sleep but frames may still be transmitted;
639 * hopefully it and/or us will do the right thing and mark any
640 * transmitted frames with PWRMGT set to 1.
641 */
642 ieee80211_new_state_locked(vap, IEEE80211_S_SLEEP, 0);
643
644 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
645 "%s: time delta=%d msec\n", __func__,
646 (int) ticks_to_msecs(ticks - ic->ic_lastdata));
647
648 out:
649 return;
650 }
651