The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_power.c

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    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: 76d0a96d155ea9ed75459c98006f3c39


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