The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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) 2002-2007 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 <sys/param.h>
   33 #include <sys/systm.h> 
   34 #include <sys/kernel.h>
   35  
   36 #include <sys/socket.h>
   37 
   38 #include <net/if.h>
   39 #include <net/if_media.h>
   40 #include <net/ethernet.h>
   41 
   42 #include <net80211/ieee80211_var.h>
   43 
   44 #include <net/bpf.h>
   45 
   46 static void ieee80211_set_tim(struct ieee80211_node *ni, int set);
   47 
   48 void
   49 ieee80211_power_attach(struct ieee80211com *ic)
   50 {
   51         if (ic->ic_opmode == IEEE80211_M_HOSTAP ||
   52             ic->ic_opmode == IEEE80211_M_IBSS) {
   53                 /* NB: driver should override */
   54                 ic->ic_set_tim = ieee80211_set_tim;
   55         }
   56 }
   57 
   58 void
   59 ieee80211_power_lateattach(struct ieee80211com *ic)
   60 {
   61         /*
   62          * Allocate these only if needed.  Beware that we
   63          * know adhoc mode doesn't support ATIM yet...
   64          */
   65         if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
   66                 ic->ic_tim_len = howmany(ic->ic_max_aid,8) * sizeof(uint8_t);
   67                 MALLOC(ic->ic_tim_bitmap, uint8_t *, ic->ic_tim_len,
   68                         M_DEVBUF, M_NOWAIT | M_ZERO);
   69                 if (ic->ic_tim_bitmap == NULL) {
   70                         printf("%s: no memory for TIM bitmap!\n", __func__);
   71                         /* XXX good enough to keep from crashing? */
   72                         ic->ic_tim_len = 0;
   73                 }
   74         }
   75 }
   76 
   77 void
   78 ieee80211_power_detach(struct ieee80211com *ic)
   79 {
   80         if (ic->ic_tim_bitmap != NULL) {
   81                 FREE(ic->ic_tim_bitmap, M_DEVBUF);
   82                 ic->ic_tim_bitmap = NULL;
   83         }
   84 }
   85 
   86 /*
   87  * Clear any frames queued on a node's power save queue.
   88  * The number of frames that were present is returned.
   89  */
   90 int
   91 ieee80211_node_saveq_drain(struct ieee80211_node *ni)
   92 {
   93         int qlen;
   94 
   95         IEEE80211_NODE_SAVEQ_LOCK(ni);
   96         qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
   97         _IF_DRAIN(&ni->ni_savedq);
   98         IEEE80211_NODE_SAVEQ_UNLOCK(ni);
   99 
  100         return qlen;
  101 }
  102 
  103 /*
  104  * Age frames on the power save queue. The aging interval is
  105  * 4 times the listen interval specified by the station.  This
  106  * number is factored into the age calculations when the frame
  107  * is placed on the queue.  We store ages as time differences
  108  * so we can check and/or adjust only the head of the list.
  109  * If a frame's age exceeds the threshold then discard it.
  110  * The number of frames discarded is returned so the caller
  111  * can check if it needs to adjust the tim.
  112  */
  113 int
  114 ieee80211_node_saveq_age(struct ieee80211_node *ni)
  115 {
  116         int discard = 0;
  117 
  118         if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
  119                 struct mbuf *m;
  120 
  121                 IEEE80211_NODE_SAVEQ_LOCK(ni);
  122                 while (IF_POLL(&ni->ni_savedq, m) != NULL &&
  123                      M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
  124 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/
  125                         _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
  126                         m_freem(m);
  127                         discard++;
  128                 }
  129                 if (m != NULL)
  130                         M_AGE_SUB(m, IEEE80211_INACT_WAIT);
  131                 IEEE80211_NODE_SAVEQ_UNLOCK(ni);
  132 
  133                 IEEE80211_NOTE(ni->ni_ic, IEEE80211_MSG_POWER, ni,
  134                     "discard %u frames for age", discard);
  135                 IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
  136         }
  137         return discard;
  138 }
  139 
  140 /*
  141  * Indicate whether there are frames queued for a station in power-save mode.
  142  */
  143 static void
  144 ieee80211_set_tim(struct ieee80211_node *ni, int set)
  145 {
  146         struct ieee80211com *ic = ni->ni_ic;
  147         uint16_t aid;
  148 
  149         KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP ||
  150                 ic->ic_opmode == IEEE80211_M_IBSS,
  151                 ("operating mode %u", ic->ic_opmode));
  152 
  153         aid = IEEE80211_AID(ni->ni_associd);
  154         KASSERT(aid < ic->ic_max_aid,
  155                 ("bogus aid %u, max %u", aid, ic->ic_max_aid));
  156 
  157         IEEE80211_BEACON_LOCK(ic);
  158         if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) {
  159                 if (set) {
  160                         setbit(ic->ic_tim_bitmap, aid);
  161                         ic->ic_ps_pending++;
  162                 } else {
  163                         clrbit(ic->ic_tim_bitmap, aid);
  164                         ic->ic_ps_pending--;
  165                 }
  166                 /* NB: we know ic is in RUN state so no need to check */
  167                 ic->ic_update_beacon(ic, IEEE80211_BEACON_TIM);
  168         }
  169         IEEE80211_BEACON_UNLOCK(ic);
  170 }
  171 
  172 /*
  173  * Save an outbound packet for a node in power-save sleep state.
  174  * The new packet is placed on the node's saved queue, and the TIM
  175  * is changed, if necessary.
  176  */
  177 void
  178 ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
  179 {
  180         struct ieee80211com *ic = ni->ni_ic;
  181         int qlen, age;
  182 
  183         IEEE80211_NODE_SAVEQ_LOCK(ni);
  184         if (_IF_QFULL(&ni->ni_savedq)) {
  185                 _IF_DROP(&ni->ni_savedq);
  186                 IEEE80211_NODE_SAVEQ_UNLOCK(ni);
  187                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
  188                         "[%s] pwr save q overflow, drops %d (size %d)\n",
  189                         ether_sprintf(ni->ni_macaddr), 
  190                         ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE);
  191 #ifdef IEEE80211_DEBUG
  192                 if (ieee80211_msg_dumppkts(ic))
  193                         ieee80211_dump_pkt(ic, mtod(m, caddr_t), m->m_len, -1, -1);
  194 #endif
  195                 m_freem(m);
  196                 return;
  197         }
  198         /*
  199          * Tag the frame with it's expiry time and insert
  200          * it in the queue.  The aging interval is 4 times
  201          * the listen interval specified by the station. 
  202          * Frames that sit around too long are reclaimed
  203          * using this information.
  204          */
  205         /* TU -> secs.  XXX handle overflow? */
  206         age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
  207         _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age);
  208         IEEE80211_NODE_SAVEQ_UNLOCK(ni);
  209 
  210         IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
  211                 "[%s] save frame with age %d, %u now queued\n",
  212                 ether_sprintf(ni->ni_macaddr), age, qlen);
  213 
  214         if (qlen == 1 && ic->ic_set_tim != NULL)
  215                 ic->ic_set_tim(ni, 1);
  216 }
  217 
  218 /*
  219  * Handle station power-save state change.
  220  */
  221 void
  222 ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
  223 {
  224         struct ieee80211com *ic = ni->ni_ic;
  225         struct mbuf *m, *mhead, *mtail;
  226         int mcount;
  227 
  228         if (enable) {
  229                 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
  230                         ic->ic_ps_sta++;
  231                 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
  232                 IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
  233                     "power save mode on, %u sta's in ps mode", ic->ic_ps_sta);
  234                 return;
  235         }
  236 
  237         if (ni->ni_flags & IEEE80211_NODE_PWR_MGT)
  238                 ic->ic_ps_sta--;
  239         ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  240         IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
  241             "power save mode off, %u sta's in ps mode", ic->ic_ps_sta);
  242         /* XXX if no stations in ps mode, flush mc frames */
  243 
  244         /*
  245          * Flush queued unicast frames.
  246          */
  247         if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) {
  248                 if (ic->ic_set_tim != NULL)
  249                         ic->ic_set_tim(ni, 0);          /* just in case */
  250                 return;
  251         }
  252         IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
  253             "flush ps queue, %u packets queue", IEEE80211_NODE_SAVEQ_QLEN(ni));
  254         /*
  255          * Unload the frames from the ps q but don't send them
  256          * to the driver yet.  We do this in two stages to minimize
  257          * locking but also because there's no easy way to preserve
  258          * ordering given the existing ifnet access mechanisms.
  259          * XXX could be optimized
  260          */
  261         IEEE80211_NODE_SAVEQ_LOCK(ni);
  262         mcount = IEEE80211_NODE_SAVEQ_QLEN(ni);
  263         mhead = mtail = NULL;
  264         for (;;) {
  265                 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
  266                 if (m == NULL)
  267                         break;
  268                 if (mhead == NULL) {
  269                         mhead = m;
  270                         m->m_nextpkt = NULL;
  271                 } else
  272                         mtail->m_nextpkt = m;
  273                 mtail = m;
  274         }
  275         IEEE80211_NODE_SAVEQ_UNLOCK(ni);
  276         if (mhead != NULL) {
  277                 /* XXX need different driver interface */
  278                 /* XXX bypasses q max */
  279                 IF_PREPEND_LIST(&ic->ic_ifp->if_snd, mhead, mtail, mcount);
  280         }
  281         if (ic->ic_set_tim != NULL)
  282                 ic->ic_set_tim(ni, 0);
  283 }
  284 
  285 /*
  286  * Handle power-save state change in station mode.
  287  */
  288 void
  289 ieee80211_sta_pwrsave(struct ieee80211com *ic, int enable)
  290 {
  291         struct ieee80211_node *ni = ic->ic_bss;
  292         int qlen;
  293 
  294         if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
  295                 return;
  296 
  297         IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
  298             "sta power save mode %s", enable ? "on" : "off");
  299         if (!enable) {
  300                 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  301                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
  302                 /*
  303                  * Flush any queued frames; we can do this immediately
  304                  * because we know they'll be queued behind the null
  305                  * data frame we send the ap.
  306                  * XXX can we use a data frame to take us out of ps?
  307                  */
  308                 qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
  309                 if (qlen != 0) {
  310                         IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
  311                             "flush ps queue, %u packets queued", qlen);
  312                         for (;;) {
  313                                 struct mbuf *m;
  314 
  315                                 IEEE80211_NODE_SAVEQ_LOCK(ni);
  316                                 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
  317                                 IEEE80211_NODE_SAVEQ_UNLOCK(ni);
  318                                 if (m == NULL)
  319                                         break;
  320                                 /* XXX need different driver interface */
  321                                 /* XXX bypasses q max */
  322                                 IF_ENQUEUE(&ic->ic_ifp->if_snd, m);
  323                         }
  324                 }
  325         } else {
  326                 ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
  327                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
  328         }
  329 }

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