1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
30
31 /*
32 * IEEE 802.11 power save support.
33 */
34 #include "opt_wlan.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
40
41 #include <sys/socket.h>
42
43 #include <net/if.h>
44 #include <net/if_var.h>
45 #include <net/if_media.h>
46 #include <net/ethernet.h>
47
48 #include <net80211/ieee80211_var.h>
49
50 #include <net/bpf.h>
51
52 static void ieee80211_update_ps(struct ieee80211vap *, int);
53 static int ieee80211_set_tim(struct ieee80211_node *, int);
54
55 static MALLOC_DEFINE(M_80211_POWER, "80211power", "802.11 power save state");
56
57 void
58 ieee80211_power_attach(struct ieee80211com *ic)
59 {
60 }
61
62 void
63 ieee80211_power_detach(struct ieee80211com *ic)
64 {
65 }
66
67 void
68 ieee80211_power_vattach(struct ieee80211vap *vap)
69 {
70 if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
71 vap->iv_opmode == IEEE80211_M_IBSS) {
72 /* NB: driver should override */
73 vap->iv_update_ps = ieee80211_update_ps;
74 vap->iv_set_tim = ieee80211_set_tim;
75 }
76 vap->iv_node_ps = ieee80211_node_pwrsave;
77 vap->iv_sta_ps = ieee80211_sta_pwrsave;
78 }
79
80 void
81 ieee80211_power_latevattach(struct ieee80211vap *vap)
82 {
83 /*
84 * Allocate these only if needed. Beware that we
85 * know adhoc mode doesn't support ATIM yet...
86 */
87 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
88 vap->iv_tim_len = howmany(vap->iv_max_aid,8) * sizeof(uint8_t);
89 vap->iv_tim_bitmap = (uint8_t *) IEEE80211_MALLOC(vap->iv_tim_len,
90 M_80211_POWER,
91 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
92 if (vap->iv_tim_bitmap == NULL) {
93 printf("%s: no memory for TIM bitmap!\n", __func__);
94 /* XXX good enough to keep from crashing? */
95 vap->iv_tim_len = 0;
96 }
97 }
98 }
99
100 void
101 ieee80211_power_vdetach(struct ieee80211vap *vap)
102 {
103 if (vap->iv_tim_bitmap != NULL) {
104 IEEE80211_FREE(vap->iv_tim_bitmap, M_80211_POWER);
105 vap->iv_tim_bitmap = NULL;
106 }
107 }
108
109 void
110 ieee80211_psq_init(struct ieee80211_psq *psq, const char *name)
111 {
112 memset(psq, 0, sizeof(*psq));
113 psq->psq_maxlen = IEEE80211_PS_MAX_QUEUE;
114 IEEE80211_PSQ_INIT(psq, name); /* OS-dependent setup */
115 }
116
117 void
118 ieee80211_psq_cleanup(struct ieee80211_psq *psq)
119 {
120 #if 0
121 psq_drain(psq); /* XXX should not be needed? */
122 #else
123 KASSERT(psq->psq_len == 0, ("%d frames on ps q", psq->psq_len));
124 #endif
125 IEEE80211_PSQ_DESTROY(psq); /* OS-dependent cleanup */
126 }
127
128 /*
129 * Return the highest priority frame in the ps queue.
130 */
131 struct mbuf *
132 ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen)
133 {
134 struct ieee80211_psq *psq = &ni->ni_psq;
135 struct ieee80211_psq_head *qhead;
136 struct mbuf *m;
137
138 IEEE80211_PSQ_LOCK(psq);
139 qhead = &psq->psq_head[0];
140 again:
141 if ((m = qhead->head) != NULL) {
142 if ((qhead->head = m->m_nextpkt) == NULL)
143 qhead->tail = NULL;
144 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
145 qhead->len--;
146 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
147 psq->psq_len--;
148 m->m_nextpkt = NULL;
149 }
150 if (m == NULL && qhead == &psq->psq_head[0]) {
151 /* Algol-68 style for loop */
152 qhead = &psq->psq_head[1];
153 goto again;
154 }
155 if (qlen != NULL)
156 *qlen = psq->psq_len;
157 IEEE80211_PSQ_UNLOCK(psq);
158 return m;
159 }
160
161 /*
162 * Reclaim an mbuf from the ps q. If marked with M_ENCAP
163 * we assume there is a node reference that must be relcaimed.
164 */
165 static void
166 psq_mfree(struct mbuf *m)
167 {
168 if (m->m_flags & M_ENCAP) {
169 struct ieee80211_node *ni = (void *) m->m_pkthdr.rcvif;
170 ieee80211_free_node(ni);
171 }
172 m->m_nextpkt = NULL;
173 m_freem(m);
174 }
175
176 /*
177 * Clear any frames queued in the power save queue.
178 * The number of frames that were present is returned.
179 */
180 static int
181 psq_drain(struct ieee80211_psq *psq)
182 {
183 struct ieee80211_psq_head *qhead;
184 struct mbuf *m;
185 int qlen;
186
187 IEEE80211_PSQ_LOCK(psq);
188 qlen = psq->psq_len;
189 qhead = &psq->psq_head[0];
190 again:
191 while ((m = qhead->head) != NULL) {
192 qhead->head = m->m_nextpkt;
193 psq_mfree(m);
194 }
195 qhead->tail = NULL;
196 qhead->len = 0;
197 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
198 qhead = &psq->psq_head[1];
199 goto again;
200 }
201 psq->psq_len = 0;
202 IEEE80211_PSQ_UNLOCK(psq);
203
204 return qlen;
205 }
206
207 /*
208 * Clear any frames queued in the power save queue.
209 * The number of frames that were present is returned.
210 */
211 int
212 ieee80211_node_psq_drain(struct ieee80211_node *ni)
213 {
214 return psq_drain(&ni->ni_psq);
215 }
216
217 /*
218 * Age frames on the power save queue. The aging interval is
219 * 4 times the listen interval specified by the station. This
220 * number is factored into the age calculations when the frame
221 * is placed on the queue. We store ages as time differences
222 * so we can check and/or adjust only the head of the list.
223 * If a frame's age exceeds the threshold then discard it.
224 * The number of frames discarded is returned so the caller
225 * can check if it needs to adjust the tim.
226 */
227 int
228 ieee80211_node_psq_age(struct ieee80211_node *ni)
229 {
230 struct ieee80211_psq *psq = &ni->ni_psq;
231 int discard = 0;
232
233 if (psq->psq_len != 0) {
234 #ifdef IEEE80211_DEBUG
235 struct ieee80211vap *vap = ni->ni_vap;
236 #endif
237 struct ieee80211_psq_head *qhead;
238 struct mbuf *m;
239
240 IEEE80211_PSQ_LOCK(psq);
241 qhead = &psq->psq_head[0];
242 again:
243 while ((m = qhead->head) != NULL &&
244 M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
245 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
246 "discard frame, age %u", M_AGE_GET(m));
247 if ((qhead->head = m->m_nextpkt) == NULL)
248 qhead->tail = NULL;
249 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
250 qhead->len--;
251 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
252 psq->psq_len--;
253 psq_mfree(m);
254 discard++;
255 }
256 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
257 qhead = &psq->psq_head[1];
258 goto again;
259 }
260 if (m != NULL)
261 M_AGE_SUB(m, IEEE80211_INACT_WAIT);
262 IEEE80211_PSQ_UNLOCK(psq);
263
264 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
265 "discard %u frames for age", discard);
266 IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
267 }
268 return discard;
269 }
270
271 /*
272 * Handle a change in the PS station occupancy.
273 */
274 static void
275 ieee80211_update_ps(struct ieee80211vap *vap, int nsta)
276 {
277
278 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
279 vap->iv_opmode == IEEE80211_M_IBSS,
280 ("operating mode %u", vap->iv_opmode));
281 }
282
283 /*
284 * Indicate whether there are frames queued for a station in power-save mode.
285 */
286 static int
287 ieee80211_set_tim(struct ieee80211_node *ni, int set)
288 {
289 struct ieee80211vap *vap = ni->ni_vap;
290 struct ieee80211com *ic = ni->ni_ic;
291 uint16_t aid;
292 int changed;
293
294 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
295 vap->iv_opmode == IEEE80211_M_IBSS,
296 ("operating mode %u", vap->iv_opmode));
297
298 aid = IEEE80211_AID(ni->ni_associd);
299 KASSERT(aid < vap->iv_max_aid,
300 ("bogus aid %u, max %u", aid, vap->iv_max_aid));
301
302 IEEE80211_LOCK(ic);
303 changed = (set != (isset(vap->iv_tim_bitmap, aid) != 0));
304 if (changed) {
305 if (set) {
306 setbit(vap->iv_tim_bitmap, aid);
307 vap->iv_ps_pending++;
308 } else {
309 clrbit(vap->iv_tim_bitmap, aid);
310 vap->iv_ps_pending--;
311 }
312 /* NB: we know vap is in RUN state so no need to check */
313 vap->iv_update_beacon(vap, IEEE80211_BEACON_TIM);
314 }
315 IEEE80211_UNLOCK(ic);
316
317 return changed;
318 }
319
320 /*
321 * Save an outbound packet for a node in power-save sleep state.
322 * The new packet is placed on the node's saved queue, and the TIM
323 * is changed, if necessary.
324 */
325 int
326 ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
327 {
328 struct ieee80211_psq *psq = &ni->ni_psq;
329 struct ieee80211vap *vap = ni->ni_vap;
330 struct ieee80211com *ic = ni->ni_ic;
331 struct ieee80211_psq_head *qhead;
332 int qlen, age;
333
334 IEEE80211_PSQ_LOCK(psq);
335 if (psq->psq_len >= psq->psq_maxlen) {
336 psq->psq_drops++;
337 IEEE80211_PSQ_UNLOCK(psq);
338 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
339 "pwr save q overflow, drops %d (size %d)",
340 psq->psq_drops, psq->psq_len);
341 #ifdef IEEE80211_DEBUG
342 if (ieee80211_msg_dumppkts(vap))
343 ieee80211_dump_pkt(ni->ni_ic, mtod(m, caddr_t),
344 m->m_len, -1, -1);
345 #endif
346 psq_mfree(m);
347 return ENOSPC;
348 }
349 /*
350 * Tag the frame with it's expiry time and insert it in
351 * the appropriate queue. The aging interval is 4 times
352 * the listen interval specified by the station. Frames
353 * that sit around too long are reclaimed using this
354 * information.
355 */
356 /* TU -> secs. XXX handle overflow? */
357 age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
358 /*
359 * Encapsulated frames go on the high priority queue,
360 * other stuff goes on the low priority queue. We use
361 * this to order frames returned out of the driver
362 * ahead of frames we collect in ieee80211_start.
363 */
364 if (m->m_flags & M_ENCAP)
365 qhead = &psq->psq_head[0];
366 else
367 qhead = &psq->psq_head[1];
368 if (qhead->tail == NULL) {
369 struct mbuf *mh;
370
371 qhead->head = m;
372 /*
373 * Take care to adjust age when inserting the first
374 * frame of a queue and the other queue already has
375 * frames. We need to preserve the age difference
376 * relationship so ieee80211_node_psq_age works.
377 */
378 if (qhead == &psq->psq_head[1]) {
379 mh = psq->psq_head[0].head;
380 if (mh != NULL)
381 age-= M_AGE_GET(mh);
382 } else {
383 mh = psq->psq_head[1].head;
384 if (mh != NULL) {
385 int nage = M_AGE_GET(mh) - age;
386 /* XXX is clamping to zero good 'nuf? */
387 M_AGE_SET(mh, nage < 0 ? 0 : nage);
388 }
389 }
390 } else {
391 qhead->tail->m_nextpkt = m;
392 age -= M_AGE_GET(qhead->head);
393 }
394 KASSERT(age >= 0, ("age %d", age));
395 M_AGE_SET(m, age);
396 m->m_nextpkt = NULL;
397 qhead->tail = m;
398 qhead->len++;
399 qlen = ++(psq->psq_len);
400 IEEE80211_PSQ_UNLOCK(psq);
401
402 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
403 "save frame with age %d, %u now queued", age, qlen);
404
405 if (qlen == 1 && vap->iv_set_tim != NULL)
406 vap->iv_set_tim(ni, 1);
407
408 return 0;
409 }
410
411 /*
412 * Move frames from the ps q to the vap's send queue
413 * and/or the driver's send queue; and kick the start
414 * method for each, as appropriate. Note we're careful
415 * to preserve packet ordering here.
416 */
417 static void
418 pwrsave_flushq(struct ieee80211_node *ni)
419 {
420 struct ieee80211_psq *psq = &ni->ni_psq;
421 struct ieee80211com *ic = ni->ni_ic;
422 struct ieee80211vap *vap = ni->ni_vap;
423 struct ieee80211_psq_head *qhead;
424 struct mbuf *parent_q = NULL, *ifp_q = NULL;
425 struct mbuf *m;
426
427 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
428 "flush ps queue, %u packets queued", psq->psq_len);
429
430 IEEE80211_PSQ_LOCK(psq);
431 qhead = &psq->psq_head[0]; /* 802.11 frames */
432 if (qhead->head != NULL) {
433 /* XXX could dispatch through vap and check M_ENCAP */
434 /* XXX need different driver interface */
435 /* XXX bypasses q max and OACTIVE */
436 parent_q = qhead->head;
437 qhead->head = qhead->tail = NULL;
438 qhead->len = 0;
439 }
440
441 qhead = &psq->psq_head[1]; /* 802.3 frames */
442 if (qhead->head != NULL) {
443 /* XXX need different driver interface */
444 /* XXX bypasses q max and OACTIVE */
445 ifp_q = qhead->head;
446 qhead->head = qhead->tail = NULL;
447 qhead->len = 0;
448 }
449 psq->psq_len = 0;
450 IEEE80211_PSQ_UNLOCK(psq);
451
452 /* NB: do this outside the psq lock */
453 /* XXX packets might get reordered if parent is OACTIVE */
454 /* parent frames, should be encapsulated */
455 while (parent_q != NULL) {
456 m = parent_q;
457 parent_q = m->m_nextpkt;
458 m->m_nextpkt = NULL;
459 /* must be encapsulated */
460 KASSERT((m->m_flags & M_ENCAP),
461 ("%s: parentq with non-M_ENCAP frame!\n",
462 __func__));
463 (void) ieee80211_parent_xmitpkt(ic, m);
464 }
465
466 /* VAP frames, aren't encapsulated */
467 while (ifp_q != NULL) {
468 m = ifp_q;
469 ifp_q = m->m_nextpkt;
470 m->m_nextpkt = NULL;
471 KASSERT((!(m->m_flags & M_ENCAP)),
472 ("%s: vapq with M_ENCAP frame!\n", __func__));
473 (void) ieee80211_vap_xmitpkt(vap, m);
474 }
475 }
476
477 /*
478 * Handle station power-save state change.
479 */
480 void
481 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
482 {
483 struct ieee80211vap *vap = ni->ni_vap;
484 int update;
485
486 update = 0;
487 if (enable) {
488 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
489 vap->iv_ps_sta++;
490 update = 1;
491 }
492 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
493 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
494 "power save mode on, %u sta's in ps mode", vap->iv_ps_sta);
495
496 if (update)
497 vap->iv_update_ps(vap, vap->iv_ps_sta);
498 } else {
499 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
500 vap->iv_ps_sta--;
501 update = 1;
502 }
503 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
504 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
505 "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
506
507 /* NB: order here is intentional so TIM is clear before flush */
508 if (vap->iv_set_tim != NULL)
509 vap->iv_set_tim(ni, 0);
510 if (update) {
511 /* NB if no sta's in ps, driver should flush mc q */
512 vap->iv_update_ps(vap, vap->iv_ps_sta);
513 }
514 if (ni->ni_psq.psq_len != 0)
515 pwrsave_flushq(ni);
516 }
517 }
518
519 /*
520 * Handle power-save state change in station mode.
521 */
522 void
523 ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
524 {
525 struct ieee80211_node *ni = vap->iv_bss;
526
527 if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
528 return;
529
530 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
531 "sta power save mode %s", enable ? "on" : "off");
532 if (!enable) {
533 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
534 ieee80211_send_nulldata(ieee80211_ref_node(ni));
535 /*
536 * Flush any queued frames; we can do this immediately
537 * because we know they'll be queued behind the null
538 * data frame we send the ap.
539 * XXX can we use a data frame to take us out of ps?
540 */
541 if (ni->ni_psq.psq_len != 0)
542 pwrsave_flushq(ni);
543 } else {
544 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
545 ieee80211_send_nulldata(ieee80211_ref_node(ni));
546 }
547 }
548
549 /*
550 * Handle being notified that we have data available for us in a TIM/ATIM.
551 *
552 * This may schedule a transition from _SLEEP -> _RUN if it's appropriate.
553 *
554 * In STA mode, we may have put to sleep during scan and need to be dragged
555 * back out of powersave mode.
556 */
557 void
558 ieee80211_sta_tim_notify(struct ieee80211vap *vap, int set)
559 {
560 struct ieee80211com *ic = vap->iv_ic;
561
562 /*
563 * Schedule the driver state change. It'll happen at some point soon.
564 * Since the hardware shouldn't know that we're running just yet
565 * (and thus tell the peer that we're awake before we actually wake
566 * up said hardware), we leave the actual node state transition
567 * up to the transition to RUN.
568 *
569 * XXX TODO: verify that the transition to RUN will wake up the
570 * BSS node!
571 */
572 IEEE80211_LOCK(vap->iv_ic);
573 if (set == 1 && vap->iv_state == IEEE80211_S_SLEEP) {
574 ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
575 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
576 "%s: TIM=%d; wakeup\n", __func__, set);
577 } else if ((set == 1) && (ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN)) {
578 /*
579 * XXX only do this if we're in RUN state?
580 */
581 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
582 "%s: wake up from bgscan vap sleep\n",
583 __func__);
584 /*
585 * We may be in BGSCAN mode - this means the VAP is in STA
586 * mode powersave. If it is, we need to wake it up so we
587 * can process outbound traffic.
588 */
589 vap->iv_sta_ps(vap, 0);
590 }
591 IEEE80211_UNLOCK(vap->iv_ic);
592 }
593
594 /*
595 * Timer check on whether the VAP has had any transmit activity.
596 *
597 * This may schedule a transition from _RUN -> _SLEEP if it's appropriate.
598 */
599 void
600 ieee80211_sta_ps_timer_check(struct ieee80211vap *vap)
601 {
602 struct ieee80211com *ic = vap->iv_ic;
603
604 /* XXX lock assert */
605
606 /* For no, only do this in STA mode */
607 if (! (vap->iv_caps & IEEE80211_C_SWSLEEP))
608 goto out;
609
610 if (vap->iv_opmode != IEEE80211_M_STA)
611 goto out;
612
613 /* If we're not at run state, bail */
614 if (vap->iv_state != IEEE80211_S_RUN)
615 goto out;
616
617 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
618 "%s: lastdata=%llu, ticks=%llu\n",
619 __func__, (unsigned long long) ic->ic_lastdata,
620 (unsigned long long) ticks);
621
622 /* If powersave is disabled on the VAP, don't bother */
623 if (! (vap->iv_flags & IEEE80211_F_PMGTON))
624 goto out;
625
626 /* If we've done any data within our idle interval, bail */
627 /* XXX hard-coded to one second for now, ew! */
628 if (ieee80211_time_after(ic->ic_lastdata + 500, ticks))
629 goto out;
630
631 /*
632 * Signify we're going into power save and transition the
633 * node to powersave.
634 */
635 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
636 vap->iv_sta_ps(vap, 1);
637
638 /*
639 * XXX The driver has to handle the fact that we're going
640 * to sleep but frames may still be transmitted;
641 * hopefully it and/or us will do the right thing and mark any
642 * transmitted frames with PWRMGT set to 1.
643 */
644 ieee80211_new_state_locked(vap, IEEE80211_S_SLEEP, 0);
645
646 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
647 "%s: time delta=%d msec\n", __func__,
648 (int) ticks_to_msecs(ticks - ic->ic_lastdata));
649
650 out:
651 return;
652 }
Cache object: c9328aac035c2914c57b1918928b4590
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