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  * 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: releng/11.0/sys/net80211/ieee80211_power.c 297405 2016-03-30 00:44:10Z adrian $");
   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 <net80211/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
   56 ieee80211_power_attach(struct ieee80211com *ic)
   57 {
   58 }
   59 
   60 void
   61 ieee80211_power_detach(struct ieee80211com *ic)
   62 {
   63 }
   64 
   65 void
   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
   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                 vap->iv_tim_bitmap = (uint8_t *) IEEE80211_MALLOC(vap->iv_tim_len,
   88                         M_80211_POWER,
   89                         IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
   90                 if (vap->iv_tim_bitmap == NULL) {
   91                         printf("%s: no memory for TIM bitmap!\n", __func__);
   92                         /* XXX good enough to keep from crashing? */
   93                         vap->iv_tim_len = 0;
   94                 }
   95         }
   96 }
   97 
   98 void
   99 ieee80211_power_vdetach(struct ieee80211vap *vap)
  100 {
  101         if (vap->iv_tim_bitmap != NULL) {
  102                 IEEE80211_FREE(vap->iv_tim_bitmap, M_80211_POWER);
  103                 vap->iv_tim_bitmap = NULL;
  104         }
  105 }
  106 
  107 void
  108 ieee80211_psq_init(struct ieee80211_psq *psq, const char *name)
  109 {
  110         memset(psq, 0, sizeof(*psq));
  111         psq->psq_maxlen = IEEE80211_PS_MAX_QUEUE;
  112         IEEE80211_PSQ_INIT(psq, name);          /* OS-dependent setup */
  113 }
  114 
  115 void
  116 ieee80211_psq_cleanup(struct ieee80211_psq *psq)
  117 {
  118 #if 0
  119         psq_drain(psq);                         /* XXX should not be needed? */
  120 #else
  121         KASSERT(psq->psq_len == 0, ("%d frames on ps q", psq->psq_len));
  122 #endif
  123         IEEE80211_PSQ_DESTROY(psq);             /* OS-dependent cleanup */
  124 }
  125 
  126 /*
  127  * Return the highest priority frame in the ps queue.
  128  */
  129 struct mbuf *
  130 ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen)
  131 {
  132         struct ieee80211_psq *psq = &ni->ni_psq;
  133         struct ieee80211_psq_head *qhead;
  134         struct mbuf *m;
  135 
  136         IEEE80211_PSQ_LOCK(psq);
  137         qhead = &psq->psq_head[0];
  138 again:
  139         if ((m = qhead->head) != NULL) {
  140                 if ((qhead->head = m->m_nextpkt) == NULL)
  141                         qhead->tail = NULL;
  142                 KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
  143                 qhead->len--;
  144                 KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
  145                 psq->psq_len--;
  146                 m->m_nextpkt = NULL;
  147         }
  148         if (m == NULL && qhead == &psq->psq_head[0]) {
  149                 /* Algol-68 style for loop */
  150                 qhead = &psq->psq_head[1];
  151                 goto again;
  152         }
  153         if (qlen != NULL)
  154                 *qlen = psq->psq_len;
  155         IEEE80211_PSQ_UNLOCK(psq);
  156         return m;
  157 }
  158 
  159 /*
  160  * Reclaim an mbuf from the ps q.  If marked with M_ENCAP
  161  * we assume there is a node reference that must be relcaimed.
  162  */
  163 static void
  164 psq_mfree(struct mbuf *m)
  165 {
  166         if (m->m_flags & M_ENCAP) {
  167                 struct ieee80211_node *ni = (void *) m->m_pkthdr.rcvif;
  168                 ieee80211_free_node(ni);
  169         }
  170         m->m_nextpkt = NULL;
  171         m_freem(m);
  172 }
  173 
  174 /*
  175  * Clear any frames queued in the power save queue.
  176  * The number of frames that were present is returned.
  177  */
  178 static int
  179 psq_drain(struct ieee80211_psq *psq)
  180 {
  181         struct ieee80211_psq_head *qhead;
  182         struct mbuf *m;
  183         int qlen;
  184 
  185         IEEE80211_PSQ_LOCK(psq);
  186         qlen = psq->psq_len;
  187         qhead = &psq->psq_head[0];
  188 again:
  189         while ((m = qhead->head) != NULL) {
  190                 qhead->head = m->m_nextpkt;
  191                 psq_mfree(m);
  192         }
  193         qhead->tail = NULL;
  194         qhead->len = 0;
  195         if (qhead == &psq->psq_head[0]) {       /* Algol-68 style for loop */
  196                 qhead = &psq->psq_head[1];
  197                 goto again;
  198         }
  199         psq->psq_len = 0;
  200         IEEE80211_PSQ_UNLOCK(psq);
  201 
  202         return qlen;
  203 }
  204 
  205 /*
  206  * Clear any frames queued in the power save queue.
  207  * The number of frames that were present is returned.
  208  */
  209 int
  210 ieee80211_node_psq_drain(struct ieee80211_node *ni)
  211 {
  212         return psq_drain(&ni->ni_psq);
  213 }
  214 
  215 /*
  216  * Age frames on the power save queue. The aging interval is
  217  * 4 times the listen interval specified by the station.  This
  218  * number is factored into the age calculations when the frame
  219  * is placed on the queue.  We store ages as time differences
  220  * so we can check and/or adjust only the head of the list.
  221  * If a frame's age exceeds the threshold then discard it.
  222  * The number of frames discarded is returned so the caller
  223  * can check if it needs to adjust the tim.
  224  */
  225 int
  226 ieee80211_node_psq_age(struct ieee80211_node *ni)
  227 {
  228         struct ieee80211_psq *psq = &ni->ni_psq;
  229         int discard = 0;
  230 
  231         if (psq->psq_len != 0) {
  232 #ifdef IEEE80211_DEBUG
  233                 struct ieee80211vap *vap = ni->ni_vap;
  234 #endif
  235                 struct ieee80211_psq_head *qhead;
  236                 struct mbuf *m;
  237 
  238                 IEEE80211_PSQ_LOCK(psq);
  239                 qhead = &psq->psq_head[0];
  240         again:
  241                 while ((m = qhead->head) != NULL &&
  242                     M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
  243                         IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  244                              "discard frame, age %u", M_AGE_GET(m));
  245                         if ((qhead->head = m->m_nextpkt) == NULL)
  246                                 qhead->tail = NULL;
  247                         KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
  248                         qhead->len--;
  249                         KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
  250                         psq->psq_len--;
  251                         psq_mfree(m);
  252                         discard++;
  253                 }
  254                 if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
  255                         qhead = &psq->psq_head[1];
  256                         goto again;
  257                 }
  258                 if (m != NULL)
  259                         M_AGE_SUB(m, IEEE80211_INACT_WAIT);
  260                 IEEE80211_PSQ_UNLOCK(psq);
  261 
  262                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  263                     "discard %u frames for age", discard);
  264                 IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
  265         }
  266         return discard;
  267 }
  268 
  269 /*
  270  * Handle a change in the PS station occupancy.
  271  */
  272 static void
  273 ieee80211_update_ps(struct ieee80211vap *vap, int nsta)
  274 {
  275 
  276         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
  277                 vap->iv_opmode == IEEE80211_M_IBSS,
  278                 ("operating mode %u", vap->iv_opmode));
  279 }
  280 
  281 /*
  282  * Indicate whether there are frames queued for a station in power-save mode.
  283  */
  284 static int
  285 ieee80211_set_tim(struct ieee80211_node *ni, int set)
  286 {
  287         struct ieee80211vap *vap = ni->ni_vap;
  288         struct ieee80211com *ic = ni->ni_ic;
  289         uint16_t aid;
  290         int changed;
  291 
  292         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
  293                 vap->iv_opmode == IEEE80211_M_IBSS,
  294                 ("operating mode %u", vap->iv_opmode));
  295 
  296         aid = IEEE80211_AID(ni->ni_associd);
  297         KASSERT(aid < vap->iv_max_aid,
  298                 ("bogus aid %u, max %u", aid, vap->iv_max_aid));
  299 
  300         IEEE80211_LOCK(ic);
  301         changed = (set != (isset(vap->iv_tim_bitmap, aid) != 0));
  302         if (changed) {
  303                 if (set) {
  304                         setbit(vap->iv_tim_bitmap, aid);
  305                         vap->iv_ps_pending++;
  306                 } else {
  307                         clrbit(vap->iv_tim_bitmap, aid);
  308                         vap->iv_ps_pending--;
  309                 }
  310                 /* NB: we know vap is in RUN state so no need to check */
  311                 vap->iv_update_beacon(vap, IEEE80211_BEACON_TIM);
  312         }
  313         IEEE80211_UNLOCK(ic);
  314 
  315         return changed;
  316 }
  317 
  318 /*
  319  * Save an outbound packet for a node in power-save sleep state.
  320  * The new packet is placed on the node's saved queue, and the TIM
  321  * is changed, if necessary.
  322  */
  323 int
  324 ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
  325 {
  326         struct ieee80211_psq *psq = &ni->ni_psq;
  327         struct ieee80211vap *vap = ni->ni_vap;
  328         struct ieee80211com *ic = ni->ni_ic;
  329         struct ieee80211_psq_head *qhead;
  330         int qlen, age;
  331 
  332         IEEE80211_PSQ_LOCK(psq);
  333         if (psq->psq_len >= psq->psq_maxlen) {
  334                 psq->psq_drops++;
  335                 IEEE80211_PSQ_UNLOCK(psq);
  336                 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
  337                     "pwr save q overflow, drops %d (size %d)",
  338                     psq->psq_drops, psq->psq_len);
  339 #ifdef IEEE80211_DEBUG
  340                 if (ieee80211_msg_dumppkts(vap))
  341                         ieee80211_dump_pkt(ni->ni_ic, mtod(m, caddr_t),
  342                             m->m_len, -1, -1);
  343 #endif
  344                 psq_mfree(m);
  345                 return ENOSPC;
  346         }
  347         /*
  348          * Tag the frame with it's expiry time and insert it in
  349          * the appropriate queue.  The aging interval is 4 times
  350          * the listen interval specified by the station. Frames
  351          * that sit around too long are reclaimed using this
  352          * information.
  353          */
  354         /* TU -> secs.  XXX handle overflow? */
  355         age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
  356         /*
  357          * Encapsulated frames go on the high priority queue,
  358          * other stuff goes on the low priority queue.  We use
  359          * this to order frames returned out of the driver
  360          * ahead of frames we collect in ieee80211_start.
  361          */
  362         if (m->m_flags & M_ENCAP)
  363                 qhead = &psq->psq_head[0];
  364         else
  365                 qhead = &psq->psq_head[1];
  366         if (qhead->tail == NULL) {
  367                 struct mbuf *mh;
  368 
  369                 qhead->head = m;
  370                 /*
  371                  * Take care to adjust age when inserting the first
  372                  * frame of a queue and the other queue already has
  373                  * frames.  We need to preserve the age difference
  374                  * relationship so ieee80211_node_psq_age works.
  375                  */
  376                 if (qhead == &psq->psq_head[1]) {
  377                         mh = psq->psq_head[0].head;
  378                         if (mh != NULL)
  379                                 age-= M_AGE_GET(mh);
  380                 } else {
  381                         mh = psq->psq_head[1].head;
  382                         if (mh != NULL) {
  383                                 int nage = M_AGE_GET(mh) - age;
  384                                 /* XXX is clamping to zero good 'nuf? */
  385                                 M_AGE_SET(mh, nage < 0 ? 0 : nage);
  386                         }
  387                 }
  388         } else {
  389                 qhead->tail->m_nextpkt = m;
  390                 age -= M_AGE_GET(qhead->head);
  391         }
  392         KASSERT(age >= 0, ("age %d", age));
  393         M_AGE_SET(m, age);
  394         m->m_nextpkt = NULL;
  395         qhead->tail = m;
  396         qhead->len++;
  397         qlen = ++(psq->psq_len);
  398         IEEE80211_PSQ_UNLOCK(psq);
  399 
  400         IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  401             "save frame with age %d, %u now queued", age, qlen);
  402 
  403         if (qlen == 1 && vap->iv_set_tim != NULL)
  404                 vap->iv_set_tim(ni, 1);
  405 
  406         return 0;
  407 }
  408 
  409 /*
  410  * Move frames from the ps q to the vap's send queue
  411  * and/or the driver's send queue; and kick the start
  412  * method for each, as appropriate.  Note we're careful
  413  * to preserve packet ordering here.
  414  */
  415 static void
  416 pwrsave_flushq(struct ieee80211_node *ni)
  417 {
  418         struct ieee80211_psq *psq = &ni->ni_psq;
  419         struct ieee80211com *ic = ni->ni_ic;
  420         struct ieee80211vap *vap = ni->ni_vap;
  421         struct ieee80211_psq_head *qhead;
  422         struct mbuf *parent_q = NULL, *ifp_q = NULL;
  423         struct mbuf *m;
  424 
  425         IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  426             "flush ps queue, %u packets queued", psq->psq_len);
  427 
  428         IEEE80211_PSQ_LOCK(psq);
  429         qhead = &psq->psq_head[0];      /* 802.11 frames */
  430         if (qhead->head != NULL) {
  431                 /* XXX could dispatch through vap and check M_ENCAP */
  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         }
  438 
  439         qhead = &psq->psq_head[1];      /* 802.3 frames */
  440         if (qhead->head != NULL) {
  441                 /* XXX need different driver interface */
  442                 /* XXX bypasses q max and OACTIVE */
  443                 ifp_q = qhead->head;
  444                 qhead->head = qhead->tail = NULL;
  445                 qhead->len = 0;
  446         }
  447         psq->psq_len = 0;
  448         IEEE80211_PSQ_UNLOCK(psq);
  449 
  450         /* NB: do this outside the psq lock */
  451         /* XXX packets might get reordered if parent is OACTIVE */
  452         /* parent frames, should be encapsulated */
  453         while (parent_q != NULL) {
  454                 m = parent_q;
  455                 parent_q = m->m_nextpkt;
  456                 m->m_nextpkt = NULL;
  457                 /* must be encapsulated */
  458                 KASSERT((m->m_flags & M_ENCAP),
  459                     ("%s: parentq with non-M_ENCAP frame!\n",
  460                     __func__));
  461                 (void) ieee80211_parent_xmitpkt(ic, m);
  462         }
  463 
  464         /* VAP frames, aren't encapsulated */
  465         while (ifp_q != NULL) {
  466                 m = ifp_q;
  467                 ifp_q = m->m_nextpkt;
  468                 m->m_nextpkt = NULL;
  469                 KASSERT((!(m->m_flags & M_ENCAP)),
  470                     ("%s: vapq with M_ENCAP frame!\n", __func__));
  471                 (void) ieee80211_vap_xmitpkt(vap, m);
  472         }
  473 }
  474 
  475 /*
  476  * Handle station power-save state change.
  477  */
  478 void
  479 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
  480 {
  481         struct ieee80211vap *vap = ni->ni_vap;
  482         int update;
  483 
  484         update = 0;
  485         if (enable) {
  486                 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
  487                         vap->iv_ps_sta++;
  488                         update = 1;
  489                 }
  490                 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
  491                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  492                     "power save mode on, %u sta's in ps mode", vap->iv_ps_sta);
  493 
  494                 if (update)
  495                         vap->iv_update_ps(vap, vap->iv_ps_sta);
  496         } else {
  497                 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
  498                         vap->iv_ps_sta--;
  499                         update = 1;
  500                 }
  501                 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  502                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  503                     "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
  504 
  505                 /* NB: order here is intentional so TIM is clear before flush */
  506                 if (vap->iv_set_tim != NULL)
  507                         vap->iv_set_tim(ni, 0);
  508                 if (update) {
  509                         /* NB if no sta's in ps, driver should flush mc q */
  510                         vap->iv_update_ps(vap, vap->iv_ps_sta);
  511                 }
  512                 if (ni->ni_psq.psq_len != 0)
  513                         pwrsave_flushq(ni);
  514         }
  515 }
  516 
  517 /*
  518  * Handle power-save state change in station mode.
  519  */
  520 void
  521 ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
  522 {
  523         struct ieee80211_node *ni = vap->iv_bss;
  524 
  525         if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
  526                 return;
  527 
  528         IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  529             "sta power save mode %s", enable ? "on" : "off");
  530         if (!enable) {
  531                 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  532                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
  533                 /*
  534                  * Flush any queued frames; we can do this immediately
  535                  * because we know they'll be queued behind the null
  536                  * data frame we send the ap.
  537                  * XXX can we use a data frame to take us out of ps?
  538                  */
  539                 if (ni->ni_psq.psq_len != 0)
  540                         pwrsave_flushq(ni);
  541         } else {
  542                 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
  543                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
  544         }
  545 }
  546 
  547 /*
  548  * Handle being notified that we have data available for us in a TIM/ATIM.
  549  *
  550  * This may schedule a transition from _SLEEP -> _RUN if it's appropriate.
  551  *
  552  * In STA mode, we may have put to sleep during scan and need to be dragged
  553  * back out of powersave mode.
  554  */
  555 void
  556 ieee80211_sta_tim_notify(struct ieee80211vap *vap, int set)
  557 {
  558         struct ieee80211com *ic = vap->iv_ic;
  559 
  560         /*
  561          * Schedule the driver state change.  It'll happen at some point soon.
  562          * Since the hardware shouldn't know that we're running just yet
  563          * (and thus tell the peer that we're awake before we actually wake
  564          * up said hardware), we leave the actual node state transition
  565          * up to the transition to RUN.
  566          *
  567          * XXX TODO: verify that the transition to RUN will wake up the
  568          * BSS node!
  569          */
  570         IEEE80211_LOCK(vap->iv_ic);
  571         if (set == 1 && vap->iv_state == IEEE80211_S_SLEEP) {
  572                 ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
  573                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
  574                     "%s: TIM=%d; wakeup\n", __func__, set);
  575         } else if ((set == 1) && (ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN)) {
  576                 /*
  577                  * XXX only do this if we're in RUN state?
  578                  */
  579                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
  580                     "%s: wake up from bgscan vap sleep\n",
  581                     __func__);
  582                 /*
  583                  * We may be in BGSCAN mode - this means the VAP is is in STA
  584                  * mode powersave.  If it is, we need to wake it up so we
  585                  * can process outbound traffic.
  586                  */
  587                 vap->iv_sta_ps(vap, 0);
  588         }
  589         IEEE80211_UNLOCK(vap->iv_ic);
  590 }
  591 
  592 /*
  593  * Timer check on whether the VAP has had any transmit activity.
  594  *
  595  * This may schedule a transition from _RUN -> _SLEEP if it's appropriate.
  596  */
  597 void
  598 ieee80211_sta_ps_timer_check(struct ieee80211vap *vap)
  599 {
  600         struct ieee80211com *ic = vap->iv_ic;
  601 
  602         /* XXX lock assert */
  603 
  604         /* For no, only do this in STA mode */
  605         if (! (vap->iv_caps & IEEE80211_C_SWSLEEP))
  606                 goto out;
  607 
  608         if (vap->iv_opmode != IEEE80211_M_STA)
  609                 goto out;
  610 
  611         /* If we're not at run state, bail */
  612         if (vap->iv_state != IEEE80211_S_RUN)
  613                 goto out;
  614 
  615         IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
  616             "%s: lastdata=%llu, ticks=%llu\n",
  617             __func__, (unsigned long long) ic->ic_lastdata,
  618             (unsigned long long) ticks);
  619 
  620         /* If powersave is disabled on the VAP, don't bother */
  621         if (! (vap->iv_flags & IEEE80211_F_PMGTON))
  622                 goto out;
  623 
  624         /* If we've done any data within our idle interval, bail */
  625         /* XXX hard-coded to one second for now, ew! */
  626         if (ieee80211_time_after(ic->ic_lastdata + 500, ticks))
  627                 goto out;
  628 
  629         /*
  630          * Signify we're going into power save and transition the
  631          * node to powersave.
  632          */
  633         if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
  634                 vap->iv_sta_ps(vap, 1);
  635 
  636         /*
  637          * XXX The driver has to handle the fact that we're going
  638          * to sleep but frames may still be transmitted;
  639          * hopefully it and/or us will do the right thing and mark any
  640          * transmitted frames with PWRMGT set to 1.
  641          */
  642         ieee80211_new_state_locked(vap, IEEE80211_S_SLEEP, 0);
  643 
  644         IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
  645             "%s: time delta=%d msec\n", __func__,
  646             (int) ticks_to_msecs(ticks - ic->ic_lastdata));
  647 
  648 out:
  649         return;
  650 }

Cache object: 9d5afecb99505d81dffb4ba2ed65ba7e


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