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 38 #include <sys/socket.h> 39 40 #include <net/if.h> 41 #include <net/if_var.h> 42 #include <net/if_media.h> 43 #include <net/ethernet.h> 44 45 #include <net80211/ieee80211_var.h> 46 47 #include <net/bpf.h> 48 49 static void ieee80211_update_ps(struct ieee80211vap *, int); 50 static int ieee80211_set_tim(struct ieee80211_node *, int); 51 52 static MALLOC_DEFINE(M_80211_POWER, "80211power", "802.11 power save state"); 53 54 void 55 ieee80211_power_attach(struct ieee80211com *ic) 56 { 57 } 58 59 void 60 ieee80211_power_detach(struct ieee80211com *ic) 61 { 62 } 63 64 void 65 ieee80211_power_vattach(struct ieee80211vap *vap) 66 { 67 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 68 vap->iv_opmode == IEEE80211_M_IBSS) { 69 /* NB: driver should override */ 70 vap->iv_update_ps = ieee80211_update_ps; 71 vap->iv_set_tim = ieee80211_set_tim; 72 } 73 vap->iv_node_ps = ieee80211_node_pwrsave; 74 vap->iv_sta_ps = ieee80211_sta_pwrsave; 75 } 76 77 void 78 ieee80211_power_latevattach(struct ieee80211vap *vap) 79 { 80 /* 81 * Allocate these only if needed. Beware that we 82 * know adhoc mode doesn't support ATIM yet... 83 */ 84 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 85 vap->iv_tim_len = howmany(vap->iv_max_aid,8) * sizeof(uint8_t); 86 vap->iv_tim_bitmap = (uint8_t *) malloc(vap->iv_tim_len, 87 M_80211_POWER, M_NOWAIT | M_ZERO); 88 if (vap->iv_tim_bitmap == NULL) { 89 printf("%s: no memory for TIM bitmap!\n", __func__); 90 /* XXX good enough to keep from crashing? */ 91 vap->iv_tim_len = 0; 92 } 93 } 94 } 95 96 void 97 ieee80211_power_vdetach(struct ieee80211vap *vap) 98 { 99 if (vap->iv_tim_bitmap != NULL) { 100 free(vap->iv_tim_bitmap, M_80211_POWER); 101 vap->iv_tim_bitmap = NULL; 102 } 103 } 104 105 void 106 ieee80211_psq_init(struct ieee80211_psq *psq, const char *name) 107 { 108 memset(psq, 0, sizeof(*psq)); 109 psq->psq_maxlen = IEEE80211_PS_MAX_QUEUE; 110 IEEE80211_PSQ_INIT(psq, name); /* OS-dependent setup */ 111 } 112 113 void 114 ieee80211_psq_cleanup(struct ieee80211_psq *psq) 115 { 116 #if 0 117 psq_drain(psq); /* XXX should not be needed? */ 118 #else 119 KASSERT(psq->psq_len == 0, ("%d frames on ps q", psq->psq_len)); 120 #endif 121 IEEE80211_PSQ_DESTROY(psq); /* OS-dependent cleanup */ 122 } 123 124 /* 125 * Return the highest priority frame in the ps queue. 126 */ 127 struct mbuf * 128 ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen) 129 { 130 struct ieee80211_psq *psq = &ni->ni_psq; 131 struct ieee80211_psq_head *qhead; 132 struct mbuf *m; 133 134 IEEE80211_PSQ_LOCK(psq); 135 qhead = &psq->psq_head[0]; 136 again: 137 if ((m = qhead->head) != NULL) { 138 if ((qhead->head = m->m_nextpkt) == NULL) 139 qhead->tail = NULL; 140 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len)); 141 qhead->len--; 142 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len)); 143 psq->psq_len--; 144 m->m_nextpkt = NULL; 145 } 146 if (m == NULL && qhead == &psq->psq_head[0]) { 147 /* Algol-68 style for loop */ 148 qhead = &psq->psq_head[1]; 149 goto again; 150 } 151 if (qlen != NULL) 152 *qlen = psq->psq_len; 153 IEEE80211_PSQ_UNLOCK(psq); 154 return m; 155 } 156 157 /* 158 * Reclaim an mbuf from the ps q. If marked with M_ENCAP 159 * we assume there is a node reference that must be relcaimed. 160 */ 161 static void 162 psq_mfree(struct mbuf *m) 163 { 164 if (m->m_flags & M_ENCAP) { 165 struct ieee80211_node *ni = (void *) m->m_pkthdr.rcvif; 166 ieee80211_free_node(ni); 167 } 168 m->m_nextpkt = NULL; 169 m_freem(m); 170 } 171 172 /* 173 * Clear any frames queued in the power save queue. 174 * The number of frames that were present is returned. 175 */ 176 static int 177 psq_drain(struct ieee80211_psq *psq) 178 { 179 struct ieee80211_psq_head *qhead; 180 struct mbuf *m; 181 int qlen; 182 183 IEEE80211_PSQ_LOCK(psq); 184 qlen = psq->psq_len; 185 qhead = &psq->psq_head[0]; 186 again: 187 while ((m = qhead->head) != NULL) { 188 qhead->head = m->m_nextpkt; 189 psq_mfree(m); 190 } 191 qhead->tail = NULL; 192 qhead->len = 0; 193 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */ 194 qhead = &psq->psq_head[1]; 195 goto again; 196 } 197 psq->psq_len = 0; 198 IEEE80211_PSQ_UNLOCK(psq); 199 200 return qlen; 201 } 202 203 /* 204 * Clear any frames queued in the power save queue. 205 * The number of frames that were present is returned. 206 */ 207 int 208 ieee80211_node_psq_drain(struct ieee80211_node *ni) 209 { 210 return psq_drain(&ni->ni_psq); 211 } 212 213 /* 214 * Age frames on the power save queue. The aging interval is 215 * 4 times the listen interval specified by the station. This 216 * number is factored into the age calculations when the frame 217 * is placed on the queue. We store ages as time differences 218 * so we can check and/or adjust only the head of the list. 219 * If a frame's age exceeds the threshold then discard it. 220 * The number of frames discarded is returned so the caller 221 * can check if it needs to adjust the tim. 222 */ 223 int 224 ieee80211_node_psq_age(struct ieee80211_node *ni) 225 { 226 struct ieee80211_psq *psq = &ni->ni_psq; 227 int discard = 0; 228 229 if (psq->psq_len != 0) { 230 #ifdef IEEE80211_DEBUG 231 struct ieee80211vap *vap = ni->ni_vap; 232 #endif 233 struct ieee80211_psq_head *qhead; 234 struct mbuf *m; 235 236 IEEE80211_PSQ_LOCK(psq); 237 qhead = &psq->psq_head[0]; 238 again: 239 while ((m = qhead->head) != NULL && 240 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 241 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 242 "discard frame, age %u", M_AGE_GET(m)); 243 if ((qhead->head = m->m_nextpkt) == NULL) 244 qhead->tail = NULL; 245 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len)); 246 qhead->len--; 247 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len)); 248 psq->psq_len--; 249 psq_mfree(m); 250 discard++; 251 } 252 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */ 253 qhead = &psq->psq_head[1]; 254 goto again; 255 } 256 if (m != NULL) 257 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 258 IEEE80211_PSQ_UNLOCK(psq); 259 260 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 261 "discard %u frames for age", discard); 262 IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard); 263 } 264 return discard; 265 } 266 267 /* 268 * Handle a change in the PS station occupancy. 269 */ 270 static void 271 ieee80211_update_ps(struct ieee80211vap *vap, int nsta) 272 { 273 274 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP || 275 vap->iv_opmode == IEEE80211_M_IBSS, 276 ("operating mode %u", vap->iv_opmode)); 277 } 278 279 /* 280 * Indicate whether there are frames queued for a station in power-save mode. 281 */ 282 static int 283 ieee80211_set_tim(struct ieee80211_node *ni, int set) 284 { 285 struct ieee80211vap *vap = ni->ni_vap; 286 struct ieee80211com *ic = ni->ni_ic; 287 uint16_t aid; 288 int changed; 289 290 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP || 291 vap->iv_opmode == IEEE80211_M_IBSS, 292 ("operating mode %u", vap->iv_opmode)); 293 294 aid = IEEE80211_AID(ni->ni_associd); 295 KASSERT(aid < vap->iv_max_aid, 296 ("bogus aid %u, max %u", aid, vap->iv_max_aid)); 297 298 IEEE80211_LOCK(ic); 299 changed = (set != (isset(vap->iv_tim_bitmap, aid) != 0)); 300 if (changed) { 301 if (set) { 302 setbit(vap->iv_tim_bitmap, aid); 303 vap->iv_ps_pending++; 304 } else { 305 clrbit(vap->iv_tim_bitmap, aid); 306 vap->iv_ps_pending--; 307 } 308 /* NB: we know vap is in RUN state so no need to check */ 309 vap->iv_update_beacon(vap, IEEE80211_BEACON_TIM); 310 } 311 IEEE80211_UNLOCK(ic); 312 313 return changed; 314 } 315 316 /* 317 * Save an outbound packet for a node in power-save sleep state. 318 * The new packet is placed on the node's saved queue, and the TIM 319 * is changed, if necessary. 320 */ 321 int 322 ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m) 323 { 324 struct ieee80211_psq *psq = &ni->ni_psq; 325 struct ieee80211vap *vap = ni->ni_vap; 326 struct ieee80211com *ic = ni->ni_ic; 327 struct ieee80211_psq_head *qhead; 328 int qlen, age; 329 330 IEEE80211_PSQ_LOCK(psq); 331 if (psq->psq_len >= psq->psq_maxlen) { 332 psq->psq_drops++; 333 IEEE80211_PSQ_UNLOCK(psq); 334 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 335 "pwr save q overflow, drops %d (size %d)", 336 psq->psq_drops, psq->psq_len); 337 #ifdef IEEE80211_DEBUG 338 if (ieee80211_msg_dumppkts(vap)) 339 ieee80211_dump_pkt(ni->ni_ic, mtod(m, caddr_t), 340 m->m_len, -1, -1); 341 #endif 342 psq_mfree(m); 343 return ENOSPC; 344 } 345 /* 346 * Tag the frame with it's expiry time and insert it in 347 * the appropriate queue. The aging interval is 4 times 348 * the listen interval specified by the station. Frames 349 * that sit around too long are reclaimed using this 350 * information. 351 */ 352 /* TU -> secs. XXX handle overflow? */ 353 age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000; 354 /* 355 * Encapsulated frames go on the high priority queue, 356 * other stuff goes on the low priority queue. We use 357 * this to order frames returned out of the driver 358 * ahead of frames we collect in ieee80211_start. 359 */ 360 if (m->m_flags & M_ENCAP) 361 qhead = &psq->psq_head[0]; 362 else 363 qhead = &psq->psq_head[1]; 364 if (qhead->tail == NULL) { 365 struct mbuf *mh; 366 367 qhead->head = m; 368 /* 369 * Take care to adjust age when inserting the first 370 * frame of a queue and the other queue already has 371 * frames. We need to preserve the age difference 372 * relationship so ieee80211_node_psq_age works. 373 */ 374 if (qhead == &psq->psq_head[1]) { 375 mh = psq->psq_head[0].head; 376 if (mh != NULL) 377 age-= M_AGE_GET(mh); 378 } else { 379 mh = psq->psq_head[1].head; 380 if (mh != NULL) { 381 int nage = M_AGE_GET(mh) - age; 382 /* XXX is clamping to zero good 'nuf? */ 383 M_AGE_SET(mh, nage < 0 ? 0 : nage); 384 } 385 } 386 } else { 387 qhead->tail->m_nextpkt = m; 388 age -= M_AGE_GET(qhead->head); 389 } 390 KASSERT(age >= 0, ("age %d", age)); 391 M_AGE_SET(m, age); 392 m->m_nextpkt = NULL; 393 qhead->tail = m; 394 qhead->len++; 395 qlen = ++(psq->psq_len); 396 IEEE80211_PSQ_UNLOCK(psq); 397 398 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 399 "save frame with age %d, %u now queued", age, qlen); 400 401 if (qlen == 1 && vap->iv_set_tim != NULL) 402 vap->iv_set_tim(ni, 1); 403 404 return 0; 405 } 406 407 /* 408 * Move frames from the ps q to the vap's send queue 409 * and/or the driver's send queue; and kick the start 410 * method for each, as appropriate. Note we're careful 411 * to preserve packet ordering here. 412 */ 413 static void 414 pwrsave_flushq(struct ieee80211_node *ni) 415 { 416 struct ieee80211_psq *psq = &ni->ni_psq; 417 struct ieee80211com *ic = ni->ni_ic; 418 struct ieee80211vap *vap = ni->ni_vap; 419 struct ieee80211_psq_head *qhead; 420 struct ifnet *parent, *ifp; 421 struct mbuf *parent_q = NULL, *ifp_q = NULL; 422 struct mbuf *m; 423 424 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 425 "flush ps queue, %u packets queued", psq->psq_len); 426 427 IEEE80211_PSQ_LOCK(psq); 428 qhead = &psq->psq_head[0]; /* 802.11 frames */ 429 if (qhead->head != NULL) { 430 /* XXX could dispatch through vap and check M_ENCAP */ 431 parent = vap->iv_ic->ic_ifp; 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 } else 438 parent = NULL; 439 440 qhead = &psq->psq_head[1]; /* 802.3 frames */ 441 if (qhead->head != NULL) { 442 ifp = vap->iv_ifp; 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 } else 449 ifp = NULL; 450 psq->psq_len = 0; 451 IEEE80211_PSQ_UNLOCK(psq); 452 453 /* NB: do this outside the psq lock */ 454 /* XXX packets might get reordered if parent is OACTIVE */ 455 /* parent frames, should be encapsulated */ 456 if (parent != NULL) { 457 while (parent_q != NULL) { 458 m = parent_q; 459 parent_q = m->m_nextpkt; 460 m->m_nextpkt = NULL; 461 /* must be encapsulated */ 462 KASSERT((m->m_flags & M_ENCAP), 463 ("%s: parentq with non-M_ENCAP frame!\n", 464 __func__)); 465 /* 466 * For encaped frames, we need to free the node 467 * reference upon failure. 468 */ 469 if (ieee80211_parent_xmitpkt(ic, m) != 0) 470 ieee80211_free_node(ni); 471 } 472 } 473 474 /* VAP frames, aren't encapsulated */ 475 if (ifp != NULL) { 476 while (ifp_q != NULL) { 477 m = ifp_q; 478 ifp_q = m->m_nextpkt; 479 m->m_nextpkt = NULL; 480 KASSERT((!(m->m_flags & M_ENCAP)), 481 ("%s: vapq with M_ENCAP frame!\n", __func__)); 482 (void) ieee80211_vap_xmitpkt(vap, m); 483 } 484 } 485 } 486 487 /* 488 * Handle station power-save state change. 489 */ 490 void 491 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable) 492 { 493 struct ieee80211vap *vap = ni->ni_vap; 494 int update; 495 496 update = 0; 497 if (enable) { 498 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 499 vap->iv_ps_sta++; 500 update = 1; 501 } 502 ni->ni_flags |= IEEE80211_NODE_PWR_MGT; 503 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 504 "power save mode on, %u sta's in ps mode", vap->iv_ps_sta); 505 506 if (update) 507 vap->iv_update_ps(vap, vap->iv_ps_sta); 508 } else { 509 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { 510 vap->iv_ps_sta--; 511 update = 1; 512 } 513 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 514 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 515 "power save mode off, %u sta's in ps mode", vap->iv_ps_sta); 516 517 /* NB: order here is intentional so TIM is clear before flush */ 518 if (vap->iv_set_tim != NULL) 519 vap->iv_set_tim(ni, 0); 520 if (update) { 521 /* NB if no sta's in ps, driver should flush mc q */ 522 vap->iv_update_ps(vap, vap->iv_ps_sta); 523 } 524 if (ni->ni_psq.psq_len != 0) 525 pwrsave_flushq(ni); 526 } 527 } 528 529 /* 530 * Handle power-save state change in station mode. 531 */ 532 void 533 ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable) 534 { 535 struct ieee80211_node *ni = vap->iv_bss; 536 537 if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0))) 538 return; 539 540 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 541 "sta power save mode %s", enable ? "on" : "off"); 542 if (!enable) { 543 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 544 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 545 /* 546 * Flush any queued frames; we can do this immediately 547 * because we know they'll be queued behind the null 548 * data frame we send the ap. 549 * XXX can we use a data frame to take us out of ps? 550 */ 551 if (ni->ni_psq.psq_len != 0) 552 pwrsave_flushq(ni); 553 } else { 554 ni->ni_flags |= IEEE80211_NODE_PWR_MGT; 555 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 556 } 557 } 558 559 /* 560 * Handle being notified that we have data available for us in a TIM/ATIM. 561 * 562 * This may schedule a transition from _SLEEP -> _RUN if it's appropriate. 563 * 564 * In STA mode, we may have put to sleep during scan and need to be dragged 565 * back out of powersave mode. 566 */ 567 void 568 ieee80211_sta_tim_notify(struct ieee80211vap *vap, int set) 569 { 570 struct ieee80211com *ic = vap->iv_ic; 571 572 /* 573 * Schedule the driver state change. It'll happen at some point soon. 574 * Since the hardware shouldn't know that we're running just yet 575 * (and thus tell the peer that we're awake before we actually wake 576 * up said hardware), we leave the actual node state transition 577 * up to the transition to RUN. 578 * 579 * XXX TODO: verify that the transition to RUN will wake up the 580 * BSS node! 581 */ 582 IEEE80211_LOCK(vap->iv_ic); 583 if (set == 1 && vap->iv_state == IEEE80211_S_SLEEP) { 584 ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0); 585 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 586 "%s: TIM=%d; wakeup\n", __func__, set); 587 } else if ((set == 1) && (ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN)) { 588 /* 589 * XXX only do this if we're in RUN state? 590 */ 591 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 592 "%s: wake up from bgscan vap sleep\n", 593 __func__); 594 /* 595 * We may be in BGSCAN mode - this means the VAP is is in STA 596 * mode powersave. If it is, we need to wake it up so we 597 * can process outbound traffic. 598 */ 599 vap->iv_sta_ps(vap, 0); 600 } 601 IEEE80211_UNLOCK(vap->iv_ic); 602 } 603 604 /* 605 * Timer check on whether the VAP has had any transmit activity. 606 * 607 * This may schedule a transition from _RUN -> _SLEEP if it's appropriate. 608 */ 609 void 610 ieee80211_sta_ps_timer_check(struct ieee80211vap *vap) 611 { 612 struct ieee80211com *ic = vap->iv_ic; 613 614 /* XXX lock assert */ 615 616 /* For no, only do this in STA mode */ 617 if (! (vap->iv_caps & IEEE80211_C_SWSLEEP)) 618 goto out; 619 620 if (vap->iv_opmode != IEEE80211_M_STA) 621 goto out; 622 623 /* If we're not at run state, bail */ 624 if (vap->iv_state != IEEE80211_S_RUN) 625 goto out; 626 627 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 628 "%s: lastdata=%llu, ticks=%llu\n", 629 __func__, (unsigned long long) ic->ic_lastdata, 630 (unsigned long long) ticks); 631 632 /* If powersave is disabled on the VAP, don't bother */ 633 if (! (vap->iv_flags & IEEE80211_F_PMGTON)) 634 goto out; 635 636 /* If we've done any data within our idle interval, bail */ 637 /* XXX hard-coded to one second for now, ew! */ 638 if (time_after(ic->ic_lastdata + 500, ticks)) 639 goto out; 640 641 /* 642 * Signify we're going into power save and transition the 643 * node to powersave. 644 */ 645 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) 646 vap->iv_sta_ps(vap, 1); 647 648 /* 649 * XXX The driver has to handle the fact that we're going 650 * to sleep but frames may still be transmitted; 651 * hopefully it and/or us will do the right thing and mark any 652 * transmitted frames with PWRMGT set to 1. 653 */ 654 ieee80211_new_state_locked(vap, IEEE80211_S_SLEEP, 0); 655 656 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 657 "%s: time delta=%d msec\n", __func__, 658 (int) ticks_to_msecs(ticks - ic->ic_lastdata)); 659 660 out: 661 return; 662 } 663