b032f27c36
Note this includes changes to all drivers and moves some device firmware loading to use firmware(9) and a separate module (e.g. ral). Also there no longer are separate wlan_scan* modules; this functionality is now bundled into the wlan module. Supported by: Hobnob and Marvell Reviewed by: many Obtained from: Atheros (some bits)
367 lines
9.8 KiB
C
367 lines
9.8 KiB
C
/*-
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* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* IEEE 802.11 power save support.
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*/
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#include "opt_wlan.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#include <net/ethernet.h>
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#include <net80211/ieee80211_var.h>
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#include <net/bpf.h>
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static void ieee80211_update_ps(struct ieee80211vap *, int);
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static int ieee80211_set_tim(struct ieee80211_node *, int);
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MALLOC_DEFINE(M_80211_POWER, "80211power", "802.11 power save state");
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void
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ieee80211_power_attach(struct ieee80211com *ic)
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{
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}
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void
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ieee80211_power_detach(struct ieee80211com *ic)
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{
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}
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void
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ieee80211_power_vattach(struct ieee80211vap *vap)
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{
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if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
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vap->iv_opmode == IEEE80211_M_IBSS) {
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/* NB: driver should override */
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vap->iv_update_ps = ieee80211_update_ps;
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vap->iv_set_tim = ieee80211_set_tim;
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}
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}
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void
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ieee80211_power_latevattach(struct ieee80211vap *vap)
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{
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/*
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* Allocate these only if needed. Beware that we
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* know adhoc mode doesn't support ATIM yet...
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*/
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if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
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vap->iv_tim_len = howmany(vap->iv_max_aid,8) * sizeof(uint8_t);
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MALLOC(vap->iv_tim_bitmap, uint8_t *, vap->iv_tim_len,
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M_80211_POWER, M_NOWAIT | M_ZERO);
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if (vap->iv_tim_bitmap == NULL) {
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printf("%s: no memory for TIM bitmap!\n", __func__);
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/* XXX good enough to keep from crashing? */
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vap->iv_tim_len = 0;
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}
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}
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}
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void
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ieee80211_power_vdetach(struct ieee80211vap *vap)
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{
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if (vap->iv_tim_bitmap != NULL) {
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FREE(vap->iv_tim_bitmap, M_80211_POWER);
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vap->iv_tim_bitmap = NULL;
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}
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}
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/*
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* Clear any frames queued on a node's power save queue.
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* The number of frames that were present is returned.
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*/
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int
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ieee80211_node_saveq_drain(struct ieee80211_node *ni)
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{
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int qlen;
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IEEE80211_NODE_SAVEQ_LOCK(ni);
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qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
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_IF_DRAIN(&ni->ni_savedq);
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IEEE80211_NODE_SAVEQ_UNLOCK(ni);
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return qlen;
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}
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/*
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* Age frames on the power save queue. The aging interval is
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* 4 times the listen interval specified by the station. This
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* number is factored into the age calculations when the frame
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* is placed on the queue. We store ages as time differences
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* so we can check and/or adjust only the head of the list.
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* If a frame's age exceeds the threshold then discard it.
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* The number of frames discarded is returned so the caller
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* can check if it needs to adjust the tim.
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*/
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int
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ieee80211_node_saveq_age(struct ieee80211_node *ni)
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{
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int discard = 0;
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if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
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#ifdef IEEE80211_DEBUG
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struct ieee80211vap *vap = ni->ni_vap;
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#endif
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struct mbuf *m;
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IEEE80211_NODE_SAVEQ_LOCK(ni);
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while (IF_POLL(&ni->ni_savedq, m) != NULL &&
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M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"discard frame, age %u", M_AGE_GET(m));
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_IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
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m_freem(m);
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discard++;
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}
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if (m != NULL)
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M_AGE_SUB(m, IEEE80211_INACT_WAIT);
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IEEE80211_NODE_SAVEQ_UNLOCK(ni);
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"discard %u frames for age", discard);
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IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
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}
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return discard;
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}
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/*
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* Handle a change in the PS station occupancy.
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*/
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static void
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ieee80211_update_ps(struct ieee80211vap *vap, int nsta)
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{
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KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
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vap->iv_opmode == IEEE80211_M_IBSS,
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("operating mode %u", vap->iv_opmode));
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}
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/*
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* Indicate whether there are frames queued for a station in power-save mode.
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*/
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static int
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ieee80211_set_tim(struct ieee80211_node *ni, int set)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211com *ic = ni->ni_ic;
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uint16_t aid;
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int changed;
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KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
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vap->iv_opmode == IEEE80211_M_IBSS,
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("operating mode %u", vap->iv_opmode));
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aid = IEEE80211_AID(ni->ni_associd);
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KASSERT(aid < vap->iv_max_aid,
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("bogus aid %u, max %u", aid, vap->iv_max_aid));
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IEEE80211_LOCK(ic);
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changed = (set != (isset(vap->iv_tim_bitmap, aid) != 0));
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if (changed) {
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if (set) {
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setbit(vap->iv_tim_bitmap, aid);
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vap->iv_ps_pending++;
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} else {
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clrbit(vap->iv_tim_bitmap, aid);
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vap->iv_ps_pending--;
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}
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/* NB: we know vap is in RUN state so no need to check */
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vap->iv_update_beacon(vap, IEEE80211_BEACON_TIM);
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}
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IEEE80211_UNLOCK(ic);
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return changed;
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}
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/*
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* Save an outbound packet for a node in power-save sleep state.
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* The new packet is placed on the node's saved queue, and the TIM
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* is changed, if necessary.
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*/
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void
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ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211com *ic = ni->ni_ic;
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int qlen, age;
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IEEE80211_NODE_SAVEQ_LOCK(ni);
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if (_IF_QFULL(&ni->ni_savedq)) {
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_IF_DROP(&ni->ni_savedq);
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IEEE80211_NODE_SAVEQ_UNLOCK(ni);
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IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
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"pwr save q overflow, drops %d (size %d)",
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ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE);
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#ifdef IEEE80211_DEBUG
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if (ieee80211_msg_dumppkts(vap))
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ieee80211_dump_pkt(ni->ni_ic, mtod(m, caddr_t),
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m->m_len, -1, -1);
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#endif
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m_freem(m);
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return;
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}
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/*
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* Tag the frame with it's expiry time and insert
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* it in the queue. The aging interval is 4 times
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* the listen interval specified by the station.
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* Frames that sit around too long are reclaimed
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* using this information.
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*/
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/* TU -> secs. XXX handle overflow? */
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age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
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_IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age);
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IEEE80211_NODE_SAVEQ_UNLOCK(ni);
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"save frame with age %d, %u now queued", age, qlen);
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if (qlen == 1 && vap->iv_set_tim != NULL)
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vap->iv_set_tim(ni, 1);
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}
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/*
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* Unload the frames from the ps q but don't send them
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* to the driver yet. We do this in two stages to minimize
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* locking but also because there's no easy way to preserve
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* ordering given the existing ifnet access mechanisms.
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* XXX could be optimized
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*/
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static void
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pwrsave_flushq(struct ieee80211_node *ni)
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{
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struct mbuf *m, *mhead, *mtail;
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int mcount;
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IEEE80211_NODE_SAVEQ_LOCK(ni);
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mcount = IEEE80211_NODE_SAVEQ_QLEN(ni);
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mhead = mtail = NULL;
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for (;;) {
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_IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
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if (m == NULL)
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break;
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if (mhead == NULL) {
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mhead = m;
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m->m_nextpkt = NULL;
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} else
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mtail->m_nextpkt = m;
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mtail = m;
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}
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IEEE80211_NODE_SAVEQ_UNLOCK(ni);
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if (mhead != NULL) {
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/* XXX need different driver interface */
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/* XXX bypasses q max and OACTIVE */
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struct ifnet *ifp = ni->ni_vap->iv_ifp;
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IF_PREPEND_LIST(&ifp->if_snd, mhead, mtail, mcount);
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if_start(ifp);
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}
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}
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/*
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* Handle station power-save state change.
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*/
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void
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ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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int update;
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update = 0;
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if (enable) {
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if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
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vap->iv_ps_sta++;
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update = 1;
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}
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ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"power save mode on, %u sta's in ps mode", vap->iv_ps_sta);
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if (update)
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vap->iv_update_ps(vap, vap->iv_ps_sta);
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} else {
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if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
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vap->iv_ps_sta--;
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update = 1;
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}
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ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
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/* NB: order here is intentional so TIM is clear before flush */
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if (vap->iv_set_tim != NULL)
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vap->iv_set_tim(ni, 0);
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if (update) {
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/* NB if no sta's in ps, driver should flush mc q */
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vap->iv_update_ps(vap, vap->iv_ps_sta);
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}
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pwrsave_flushq(ni);
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}
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}
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/*
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* Handle power-save state change in station mode.
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*/
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void
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ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
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{
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struct ieee80211_node *ni = vap->iv_bss;
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int qlen;
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if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
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return;
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"sta power save mode %s", enable ? "on" : "off");
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if (!enable) {
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ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
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ieee80211_send_nulldata(ieee80211_ref_node(ni));
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/*
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* Flush any queued frames; we can do this immediately
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* because we know they'll be queued behind the null
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* data frame we send the ap.
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* XXX can we use a data frame to take us out of ps?
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*/
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qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
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if (qlen != 0) {
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"flush ps queue, %u packets queued", qlen);
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pwrsave_flushq(ni);
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}
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} else {
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ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
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ieee80211_send_nulldata(ieee80211_ref_node(ni));
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}
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}
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