1 /*-
2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
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 <netproto/802_11/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 #if defined(__DragonFly__)
88 vap->iv_tim_bitmap = (uint8_t *) kmalloc(vap->iv_tim_len,
89 M_80211_POWER, M_INTWAIT | M_ZERO);
90 #else
91 vap->iv_tim_bitmap = (uint8_t *) IEEE80211_MALLOC(vap->iv_tim_len,
92 M_80211_POWER,
93 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
94 #endif
95 if (vap->iv_tim_bitmap == NULL) {
96 kprintf("%s: no memory for TIM bitmap!\n", __func__);
97 /* XXX good enough to keep from crashing? */
98 vap->iv_tim_len = 0;
99 }
100 }
101 }
102
103 void
ieee80211_power_vdetach(struct ieee80211vap * vap)104 ieee80211_power_vdetach(struct ieee80211vap *vap)
105 {
106 if (vap->iv_tim_bitmap != NULL) {
107 IEEE80211_FREE(vap->iv_tim_bitmap, M_80211_POWER);
108 vap->iv_tim_bitmap = NULL;
109 }
110 }
111
112 void
ieee80211_psq_init(struct ieee80211_psq * psq,const char * name)113 ieee80211_psq_init(struct ieee80211_psq *psq, const char *name)
114 {
115 memset(psq, 0, sizeof(*psq));
116 psq->psq_maxlen = IEEE80211_PS_MAX_QUEUE;
117 IEEE80211_PSQ_INIT(psq, name); /* OS-dependent setup */
118 }
119
120 void
ieee80211_psq_cleanup(struct ieee80211_psq * psq)121 ieee80211_psq_cleanup(struct ieee80211_psq *psq)
122 {
123 #if 0
124 psq_drain(psq); /* XXX should not be needed? */
125 #else
126 KASSERT(psq->psq_len == 0, ("%d frames on ps q", psq->psq_len));
127 #endif
128 IEEE80211_PSQ_DESTROY(psq); /* OS-dependent cleanup */
129 }
130
131 /*
132 * Return the highest priority frame in the ps queue.
133 */
134 struct mbuf *
ieee80211_node_psq_dequeue(struct ieee80211_node * ni,int * qlen)135 ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen)
136 {
137 struct ieee80211_psq *psq = &ni->ni_psq;
138 struct ieee80211_psq_head *qhead;
139 struct mbuf *m;
140
141 IEEE80211_PSQ_LOCK(psq);
142 qhead = &psq->psq_head[0];
143 again:
144 if ((m = qhead->head) != NULL) {
145 if ((qhead->head = m->m_nextpkt) == NULL)
146 qhead->tail = NULL;
147 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
148 qhead->len--;
149 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
150 psq->psq_len--;
151 m->m_nextpkt = NULL;
152 }
153 if (m == NULL && qhead == &psq->psq_head[0]) {
154 /* Algol-68 style for loop */
155 qhead = &psq->psq_head[1];
156 goto again;
157 }
158 if (qlen != NULL)
159 *qlen = psq->psq_len;
160 IEEE80211_PSQ_UNLOCK(psq);
161 return m;
162 }
163
164 /*
165 * Reclaim an mbuf from the ps q. If marked with M_ENCAP
166 * we assume there is a node reference that must be relcaimed.
167 */
168 static void
psq_mfree(struct mbuf * m)169 psq_mfree(struct mbuf *m)
170 {
171 if (m->m_flags & M_ENCAP) {
172 struct ieee80211_node *ni = (void *) m->m_pkthdr.rcvif;
173 ieee80211_free_node(ni);
174 }
175 m->m_nextpkt = NULL;
176 m_freem(m);
177 }
178
179 /*
180 * Clear any frames queued in the power save queue.
181 * The number of frames that were present is returned.
182 */
183 static int
psq_drain(struct ieee80211_psq * psq)184 psq_drain(struct ieee80211_psq *psq)
185 {
186 struct ieee80211_psq_head *qhead;
187 struct mbuf *m;
188 int qlen;
189
190 IEEE80211_PSQ_LOCK(psq);
191 qlen = psq->psq_len;
192 qhead = &psq->psq_head[0];
193 again:
194 while ((m = qhead->head) != NULL) {
195 qhead->head = m->m_nextpkt;
196 psq_mfree(m);
197 }
198 qhead->tail = NULL;
199 qhead->len = 0;
200 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
201 qhead = &psq->psq_head[1];
202 goto again;
203 }
204 psq->psq_len = 0;
205 IEEE80211_PSQ_UNLOCK(psq);
206
207 return qlen;
208 }
209
210 /*
211 * Clear any frames queued in the power save queue.
212 * The number of frames that were present is returned.
213 */
214 int
ieee80211_node_psq_drain(struct ieee80211_node * ni)215 ieee80211_node_psq_drain(struct ieee80211_node *ni)
216 {
217 return psq_drain(&ni->ni_psq);
218 }
219
220 /*
221 * Age frames on the power save queue. The aging interval is
222 * 4 times the listen interval specified by the station. This
223 * number is factored into the age calculations when the frame
224 * is placed on the queue. We store ages as time differences
225 * so we can check and/or adjust only the head of the list.
226 * If a frame's age exceeds the threshold then discard it.
227 * The number of frames discarded is returned so the caller
228 * can check if it needs to adjust the tim.
229 */
230 int
ieee80211_node_psq_age(struct ieee80211_node * ni)231 ieee80211_node_psq_age(struct ieee80211_node *ni)
232 {
233 struct ieee80211_psq *psq = &ni->ni_psq;
234 int discard = 0;
235
236 if (psq->psq_len != 0) {
237 #ifdef IEEE80211_DEBUG
238 struct ieee80211vap *vap = ni->ni_vap;
239 #endif
240 struct ieee80211_psq_head *qhead;
241 struct mbuf *m;
242
243 IEEE80211_PSQ_LOCK(psq);
244 qhead = &psq->psq_head[0];
245 again:
246 while ((m = qhead->head) != NULL &&
247 M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
248 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
249 "discard frame, age %u", M_AGE_GET(m));
250 if ((qhead->head = m->m_nextpkt) == NULL)
251 qhead->tail = NULL;
252 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
253 qhead->len--;
254 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
255 psq->psq_len--;
256 psq_mfree(m);
257 discard++;
258 }
259 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
260 qhead = &psq->psq_head[1];
261 goto again;
262 }
263 if (m != NULL)
264 M_AGE_SUB(m, IEEE80211_INACT_WAIT);
265 IEEE80211_PSQ_UNLOCK(psq);
266
267 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
268 "discard %u frames for age", discard);
269 IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
270 }
271 return discard;
272 }
273
274 /*
275 * Handle a change in the PS station occupancy.
276 */
277 static void
ieee80211_update_ps(struct ieee80211vap * vap,int nsta)278 ieee80211_update_ps(struct ieee80211vap *vap, int nsta)
279 {
280
281 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
282 vap->iv_opmode == IEEE80211_M_IBSS,
283 ("operating mode %u", vap->iv_opmode));
284 }
285
286 /*
287 * Indicate whether there are frames queued for a station in power-save mode.
288 */
289 static int
ieee80211_set_tim(struct ieee80211_node * ni,int set)290 ieee80211_set_tim(struct ieee80211_node *ni, int set)
291 {
292 struct ieee80211vap *vap = ni->ni_vap;
293 struct ieee80211com *ic = ni->ni_ic;
294 uint16_t aid;
295 int changed;
296
297 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
298 vap->iv_opmode == IEEE80211_M_IBSS,
299 ("operating mode %u", vap->iv_opmode));
300
301 aid = IEEE80211_AID(ni->ni_associd);
302 KASSERT(aid < vap->iv_max_aid,
303 ("bogus aid %u, max %u", aid, vap->iv_max_aid));
304
305 IEEE80211_LOCK(ic);
306 changed = (set != (isset(vap->iv_tim_bitmap, aid) != 0));
307 if (changed) {
308 if (set) {
309 setbit(vap->iv_tim_bitmap, aid);
310 vap->iv_ps_pending++;
311 } else {
312 clrbit(vap->iv_tim_bitmap, aid);
313 vap->iv_ps_pending--;
314 }
315 /* NB: we know vap is in RUN state so no need to check */
316 vap->iv_update_beacon(vap, IEEE80211_BEACON_TIM);
317 }
318 IEEE80211_UNLOCK(ic);
319
320 return changed;
321 }
322
323 /*
324 * Save an outbound packet for a node in power-save sleep state.
325 * The new packet is placed on the node's saved queue, and the TIM
326 * is changed, if necessary.
327 */
328 int
ieee80211_pwrsave(struct ieee80211_node * ni,struct mbuf * m)329 ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
330 {
331 struct ieee80211_psq *psq = &ni->ni_psq;
332 struct ieee80211vap *vap = ni->ni_vap;
333 struct ieee80211com *ic = ni->ni_ic;
334 struct ieee80211_psq_head *qhead;
335 int qlen, age;
336
337 IEEE80211_PSQ_LOCK(psq);
338 if (psq->psq_len >= psq->psq_maxlen) {
339 psq->psq_drops++;
340 IEEE80211_PSQ_UNLOCK(psq);
341 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
342 "pwr save q overflow, drops %d (size %d)",
343 psq->psq_drops, psq->psq_len);
344 #ifdef IEEE80211_DEBUG
345 if (ieee80211_msg_dumppkts(vap))
346 ieee80211_dump_pkt(ni->ni_ic, mtod(m, caddr_t),
347 m->m_len, -1, -1);
348 #endif
349 psq_mfree(m);
350 return ENOSPC;
351 }
352 /*
353 * Tag the frame with it's expiry time and insert it in
354 * the appropriate queue. The aging interval is 4 times
355 * the listen interval specified by the station. Frames
356 * that sit around too long are reclaimed using this
357 * information.
358 */
359 /* TU -> secs. XXX handle overflow? */
360 age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
361 /*
362 * Encapsulated frames go on the high priority queue,
363 * other stuff goes on the low priority queue. We use
364 * this to order frames returned out of the driver
365 * ahead of frames we collect in ieee80211_start.
366 */
367 if (m->m_flags & M_ENCAP)
368 qhead = &psq->psq_head[0];
369 else
370 qhead = &psq->psq_head[1];
371 if (qhead->tail == NULL) {
372 struct mbuf *mh;
373
374 qhead->head = m;
375 /*
376 * Take care to adjust age when inserting the first
377 * frame of a queue and the other queue already has
378 * frames. We need to preserve the age difference
379 * relationship so ieee80211_node_psq_age works.
380 */
381 if (qhead == &psq->psq_head[1]) {
382 mh = psq->psq_head[0].head;
383 if (mh != NULL)
384 age-= M_AGE_GET(mh);
385 } else {
386 mh = psq->psq_head[1].head;
387 if (mh != NULL) {
388 int nage = M_AGE_GET(mh) - age;
389 /* XXX is clamping to zero good 'nuf? */
390 M_AGE_SET(mh, nage < 0 ? 0 : nage);
391 }
392 }
393 } else {
394 qhead->tail->m_nextpkt = m;
395 age -= M_AGE_GET(qhead->head);
396 }
397 KASSERT(age >= 0, ("age %d", age));
398 M_AGE_SET(m, age);
399 m->m_nextpkt = NULL;
400 qhead->tail = m;
401 qhead->len++;
402 qlen = ++(psq->psq_len);
403 IEEE80211_PSQ_UNLOCK(psq);
404
405 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
406 "save frame with age %d, %u now queued", age, qlen);
407
408 if (qlen == 1 && vap->iv_set_tim != NULL)
409 vap->iv_set_tim(ni, 1);
410
411 return 0;
412 }
413
414 /*
415 * Move frames from the ps q to the vap's send queue
416 * and/or the driver's send queue; and kick the start
417 * method for each, as appropriate. Note we're careful
418 * to preserve packet ordering here.
419 */
420 static void
pwrsave_flushq(struct ieee80211_node * ni)421 pwrsave_flushq(struct ieee80211_node *ni)
422 {
423 struct ieee80211_psq *psq = &ni->ni_psq;
424 struct ieee80211com *ic = ni->ni_ic;
425 struct ieee80211vap *vap = ni->ni_vap;
426 struct ieee80211_psq_head *qhead;
427 struct mbuf *parent_q = NULL, *ifp_q = NULL;
428 struct mbuf *m;
429
430 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
431 "flush ps queue, %u packets queued", psq->psq_len);
432
433 IEEE80211_PSQ_LOCK(psq);
434 qhead = &psq->psq_head[0]; /* 802.11 frames */
435 if (qhead->head != NULL) {
436 /* XXX could dispatch through vap and check M_ENCAP */
437 /* XXX need different driver interface */
438 /* XXX bypasses q max and OACTIVE */
439 parent_q = qhead->head;
440 qhead->head = qhead->tail = NULL;
441 qhead->len = 0;
442 }
443
444 qhead = &psq->psq_head[1]; /* 802.3 frames */
445 if (qhead->head != NULL) {
446 /* XXX need different driver interface */
447 /* XXX bypasses q max and OACTIVE */
448 ifp_q = qhead->head;
449 qhead->head = qhead->tail = NULL;
450 qhead->len = 0;
451 }
452 psq->psq_len = 0;
453 IEEE80211_PSQ_UNLOCK(psq);
454
455 /* NB: do this outside the psq lock */
456 /* XXX packets might get reordered if parent is OACTIVE */
457 /* parent frames, should be encapsulated */
458 while (parent_q != NULL) {
459 m = parent_q;
460 parent_q = m->m_nextpkt;
461 m->m_nextpkt = NULL;
462 /* must be encapsulated */
463 KASSERT((m->m_flags & M_ENCAP),
464 ("%s: parentq with non-M_ENCAP frame!\n",
465 __func__));
466 (void) ieee80211_parent_xmitpkt(ic, m);
467 }
468
469 /* VAP frames, aren't encapsulated */
470 while (ifp_q != NULL) {
471 m = ifp_q;
472 ifp_q = m->m_nextpkt;
473 m->m_nextpkt = NULL;
474 KASSERT((!(m->m_flags & M_ENCAP)),
475 ("%s: vapq with M_ENCAP frame!\n", __func__));
476 (void) ieee80211_vap_xmitpkt(vap, m);
477 }
478 }
479
480 /*
481 * Handle station power-save state change.
482 */
483 void
ieee80211_node_pwrsave(struct ieee80211_node * ni,int enable)484 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
485 {
486 struct ieee80211vap *vap = ni->ni_vap;
487 int update;
488
489 update = 0;
490 if (enable) {
491 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
492 vap->iv_ps_sta++;
493 update = 1;
494 }
495 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
496 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
497 "power save mode on, %u sta's in ps mode", vap->iv_ps_sta);
498
499 if (update)
500 vap->iv_update_ps(vap, vap->iv_ps_sta);
501 } else {
502 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
503 vap->iv_ps_sta--;
504 update = 1;
505 }
506 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
507 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
508 "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
509
510 /* NB: order here is intentional so TIM is clear before flush */
511 if (vap->iv_set_tim != NULL)
512 vap->iv_set_tim(ni, 0);
513 if (update) {
514 /* NB if no sta's in ps, driver should flush mc q */
515 vap->iv_update_ps(vap, vap->iv_ps_sta);
516 }
517 if (ni->ni_psq.psq_len != 0)
518 pwrsave_flushq(ni);
519 }
520 }
521
522 /*
523 * Handle power-save state change in station mode.
524 */
525 void
ieee80211_sta_pwrsave(struct ieee80211vap * vap,int enable)526 ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
527 {
528 struct ieee80211_node *ni = vap->iv_bss;
529
530 if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
531 return;
532
533 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
534 "sta power save mode %s", enable ? "on" : "off");
535 if (!enable) {
536 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
537 ieee80211_send_nulldata(ieee80211_ref_node(ni));
538 /*
539 * Flush any queued frames; we can do this immediately
540 * because we know they'll be queued behind the null
541 * data frame we send the ap.
542 * XXX can we use a data frame to take us out of ps?
543 */
544 if (ni->ni_psq.psq_len != 0)
545 pwrsave_flushq(ni);
546 } else {
547 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
548 ieee80211_send_nulldata(ieee80211_ref_node(ni));
549 }
550 }
551
552 /*
553 * Handle being notified that we have data available for us in a TIM/ATIM.
554 *
555 * This may schedule a transition from _SLEEP -> _RUN if it's appropriate.
556 *
557 * In STA mode, we may have put to sleep during scan and need to be dragged
558 * back out of powersave mode.
559 */
560 void
ieee80211_sta_tim_notify(struct ieee80211vap * vap,int set)561 ieee80211_sta_tim_notify(struct ieee80211vap *vap, int set)
562 {
563 struct ieee80211com *ic = vap->iv_ic;
564
565 /*
566 * Schedule the driver state change. It'll happen at some point soon.
567 * Since the hardware shouldn't know that we're running just yet
568 * (and thus tell the peer that we're awake before we actually wake
569 * up said hardware), we leave the actual node state transition
570 * up to the transition to RUN.
571 *
572 * XXX TODO: verify that the transition to RUN will wake up the
573 * BSS node!
574 */
575 IEEE80211_LOCK(vap->iv_ic);
576 if (set == 1 && vap->iv_state == IEEE80211_S_SLEEP) {
577 ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
578 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
579 "%s: TIM=%d; wakeup\n", __func__, set);
580 } else if ((set == 1) && (ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN)) {
581 /*
582 * XXX only do this if we're in RUN state?
583 */
584 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
585 "%s: wake up from bgscan vap sleep\n",
586 __func__);
587 /*
588 * We may be in BGSCAN mode - this means the VAP is is in STA
589 * mode powersave. If it is, we need to wake it up so we
590 * can process outbound traffic.
591 */
592 vap->iv_sta_ps(vap, 0);
593 }
594 IEEE80211_UNLOCK(vap->iv_ic);
595 }
596
597 /*
598 * Timer check on whether the VAP has had any transmit activity.
599 *
600 * This may schedule a transition from _RUN -> _SLEEP if it's appropriate.
601 */
602 void
ieee80211_sta_ps_timer_check(struct ieee80211vap * vap)603 ieee80211_sta_ps_timer_check(struct ieee80211vap *vap)
604 {
605 struct ieee80211com *ic = vap->iv_ic;
606
607 /* XXX lock assert */
608
609 /* For no, only do this in STA mode */
610 if (! (vap->iv_caps & IEEE80211_C_SWSLEEP))
611 goto out;
612
613 if (vap->iv_opmode != IEEE80211_M_STA)
614 goto out;
615
616 /* If we're not at run state, bail */
617 if (vap->iv_state != IEEE80211_S_RUN)
618 goto out;
619
620 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
621 "%s: lastdata=%llu, ticks=%llu\n",
622 __func__, (unsigned long long) ic->ic_lastdata,
623 (unsigned long long) ticks);
624
625 /* If powersave is disabled on the VAP, don't bother */
626 if (! (vap->iv_flags & IEEE80211_F_PMGTON))
627 goto out;
628
629 /* If we've done any data within our idle interval, bail */
630 /* XXX hard-coded to one second for now, ew! */
631 if (ieee80211_time_after(ic->ic_lastdata + 500, ticks))
632 goto out;
633
634 /*
635 * Signify we're going into power save and transition the
636 * node to powersave.
637 */
638 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
639 vap->iv_sta_ps(vap, 1);
640
641 /*
642 * XXX The driver has to handle the fact that we're going
643 * to sleep but frames may still be transmitted;
644 * hopefully it and/or us will do the right thing and mark any
645 * transmitted frames with PWRMGT set to 1.
646 */
647 ieee80211_new_state_locked(vap, IEEE80211_S_SLEEP, 0);
648
649 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
650 "%s: time delta=%d msec\n", __func__,
651 (int) ticks_to_msecs(ticks - ic->ic_lastdata));
652
653 out:
654 return;
655 }
656