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: releng/12.0/sys/net80211/ieee80211_power.c 326272 2017-11-27 15:23:17Z pfg $"); 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 52static void ieee80211_update_ps(struct ieee80211vap *, int); 53static int ieee80211_set_tim(struct ieee80211_node *, int); 54 55static MALLOC_DEFINE(M_80211_POWER, "80211power", "802.11 power save state"); 56 57void 58ieee80211_power_attach(struct ieee80211com *ic) 59{ 60} 61 62void 63ieee80211_power_detach(struct ieee80211com *ic) 64{ 65} 66 67void 68ieee80211_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 80void 81ieee80211_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 100void 101ieee80211_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 109void 110ieee80211_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 117void 118ieee80211_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 */ 131struct mbuf * 132ieee80211_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]; 140again: 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 */ 165static void 166psq_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 */ 180static int 181psq_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]; 190again: 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 */ 211int 212ieee80211_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 */ 227int 228ieee80211_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 */ 274static void 275ieee80211_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 */ 286static int 287ieee80211_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 */ 325int 326ieee80211_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 */ 417static void 418pwrsave_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 */ 480void 481ieee80211_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 */ 522void 523ieee80211_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 */ 557void 558ieee80211_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 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 */ 599void 600ieee80211_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 650out: 651 return; 652} 653