902840a5db
This transitions the VAP in and out of SLEEP state based on: * whether there's been an active transmission in the last (hardcoded) 500ms; * whether the TIM from the AP indicates there is data available. It uses the beacon reception to trigger the active traffic check. This way there's no further timer running to wake up the CPU from its own sleep states. Right now the VAP isn't woken up for multicast traffic - mostly because the only NIC I plan on doing this for right will auto wakeup and stay awake for multicast traffic indicated in the TIM. So I don't have to manually keep the hardware awake. This doesn't do anything if the NIC doesn't advertise it implements the new SWSLEEP capability AND if the VAP doesn't have powersave enabled. It also doesn't do much with ath(4) as it doesn't currently implement the SLEEP state. Tested: * AR5416, STA mode (with local ath(4) changes)
644 lines
17 KiB
C
644 lines
17 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_var.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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static 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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vap->iv_node_ps = ieee80211_node_pwrsave;
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vap->iv_sta_ps = ieee80211_sta_pwrsave;
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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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vap->iv_tim_bitmap = (uint8_t *) malloc(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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void
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ieee80211_psq_init(struct ieee80211_psq *psq, const char *name)
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{
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memset(psq, 0, sizeof(*psq));
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psq->psq_maxlen = IEEE80211_PS_MAX_QUEUE;
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IEEE80211_PSQ_INIT(psq, name); /* OS-dependent setup */
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}
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void
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ieee80211_psq_cleanup(struct ieee80211_psq *psq)
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{
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#if 0
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psq_drain(psq); /* XXX should not be needed? */
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#else
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KASSERT(psq->psq_len == 0, ("%d frames on ps q", psq->psq_len));
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#endif
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IEEE80211_PSQ_DESTROY(psq); /* OS-dependent cleanup */
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}
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/*
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* Return the highest priority frame in the ps queue.
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*/
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struct mbuf *
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ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen)
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{
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struct ieee80211_psq *psq = &ni->ni_psq;
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struct ieee80211_psq_head *qhead;
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struct mbuf *m;
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IEEE80211_PSQ_LOCK(psq);
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qhead = &psq->psq_head[0];
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again:
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if ((m = qhead->head) != NULL) {
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if ((qhead->head = m->m_nextpkt) == NULL)
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qhead->tail = NULL;
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KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
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qhead->len--;
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KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
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psq->psq_len--;
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m->m_nextpkt = NULL;
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}
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if (m == NULL && qhead == &psq->psq_head[0]) {
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/* Algol-68 style for loop */
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qhead = &psq->psq_head[1];
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goto again;
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}
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if (qlen != NULL)
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*qlen = psq->psq_len;
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IEEE80211_PSQ_UNLOCK(psq);
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return m;
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}
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/*
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* Reclaim an mbuf from the ps q. If marked with M_ENCAP
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* we assume there is a node reference that must be relcaimed.
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*/
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static void
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psq_mfree(struct mbuf *m)
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{
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if (m->m_flags & M_ENCAP) {
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struct ieee80211_node *ni = (void *) m->m_pkthdr.rcvif;
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ieee80211_free_node(ni);
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}
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m->m_nextpkt = NULL;
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m_freem(m);
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}
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/*
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* Clear any frames queued in the power save queue.
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* The number of frames that were present is returned.
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*/
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static int
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psq_drain(struct ieee80211_psq *psq)
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{
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struct ieee80211_psq_head *qhead;
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struct mbuf *m;
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int qlen;
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IEEE80211_PSQ_LOCK(psq);
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qlen = psq->psq_len;
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qhead = &psq->psq_head[0];
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again:
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while ((m = qhead->head) != NULL) {
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qhead->head = m->m_nextpkt;
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psq_mfree(m);
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}
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qhead->tail = NULL;
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qhead->len = 0;
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if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
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qhead = &psq->psq_head[1];
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goto again;
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}
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psq->psq_len = 0;
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IEEE80211_PSQ_UNLOCK(psq);
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return qlen;
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}
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/*
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* Clear any frames queued in the 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_psq_drain(struct ieee80211_node *ni)
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{
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return psq_drain(&ni->ni_psq);
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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_psq_age(struct ieee80211_node *ni)
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{
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struct ieee80211_psq *psq = &ni->ni_psq;
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int discard = 0;
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if (psq->psq_len != 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 ieee80211_psq_head *qhead;
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struct mbuf *m;
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IEEE80211_PSQ_LOCK(psq);
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qhead = &psq->psq_head[0];
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again:
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while ((m = qhead->head) != 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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if ((qhead->head = m->m_nextpkt) == NULL)
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qhead->tail = NULL;
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KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
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qhead->len--;
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KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
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psq->psq_len--;
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psq_mfree(m);
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discard++;
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}
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if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
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qhead = &psq->psq_head[1];
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goto again;
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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_PSQ_UNLOCK(psq);
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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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int
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ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
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{
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struct ieee80211_psq *psq = &ni->ni_psq;
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211com *ic = ni->ni_ic;
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struct ieee80211_psq_head *qhead;
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int qlen, age;
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IEEE80211_PSQ_LOCK(psq);
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if (psq->psq_len >= psq->psq_maxlen) {
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psq->psq_drops++;
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IEEE80211_PSQ_UNLOCK(psq);
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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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psq->psq_drops, psq->psq_len);
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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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psq_mfree(m);
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return ENOSPC;
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}
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/*
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* Tag the frame with it's expiry time and insert it in
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* the appropriate queue. The aging interval is 4 times
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* the listen interval specified by the station. Frames
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* that sit around too long are reclaimed using this
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* 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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/*
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* Encapsulated frames go on the high priority queue,
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* other stuff goes on the low priority queue. We use
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* this to order frames returned out of the driver
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* ahead of frames we collect in ieee80211_start.
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*/
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if (m->m_flags & M_ENCAP)
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qhead = &psq->psq_head[0];
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else
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qhead = &psq->psq_head[1];
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if (qhead->tail == NULL) {
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struct mbuf *mh;
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qhead->head = m;
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/*
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* Take care to adjust age when inserting the first
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* frame of a queue and the other queue already has
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* frames. We need to preserve the age difference
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* relationship so ieee80211_node_psq_age works.
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*/
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if (qhead == &psq->psq_head[1]) {
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mh = psq->psq_head[0].head;
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if (mh != NULL)
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age-= M_AGE_GET(mh);
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} else {
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mh = psq->psq_head[1].head;
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if (mh != NULL) {
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int nage = M_AGE_GET(mh) - age;
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/* XXX is clamping to zero good 'nuf? */
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M_AGE_SET(mh, nage < 0 ? 0 : nage);
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}
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}
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} else {
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qhead->tail->m_nextpkt = m;
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age -= M_AGE_GET(qhead->head);
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}
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KASSERT(age >= 0, ("age %d", age));
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M_AGE_SET(m, age);
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m->m_nextpkt = NULL;
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qhead->tail = m;
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qhead->len++;
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qlen = ++(psq->psq_len);
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IEEE80211_PSQ_UNLOCK(psq);
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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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return 0;
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}
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/*
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* Move frames from the ps q to the vap's send queue
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* and/or the driver's send queue; and kick the start
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* method for each, as appropriate. Note we're careful
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* to preserve packet ordering here.
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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 ieee80211_psq *psq = &ni->ni_psq;
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struct ieee80211com *ic = ni->ni_ic;
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211_psq_head *qhead;
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struct ifnet *parent, *ifp;
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struct mbuf *parent_q = NULL, *ifp_q = NULL;
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struct mbuf *m;
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IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
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"flush ps queue, %u packets queued", psq->psq_len);
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IEEE80211_PSQ_LOCK(psq);
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qhead = &psq->psq_head[0]; /* 802.11 frames */
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if (qhead->head != NULL) {
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/* XXX could dispatch through vap and check M_ENCAP */
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parent = vap->iv_ic->ic_ifp;
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/* XXX need different driver interface */
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/* XXX bypasses q max and OACTIVE */
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parent_q = qhead->head;
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qhead->head = qhead->tail = NULL;
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qhead->len = 0;
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} else
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parent = NULL;
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qhead = &psq->psq_head[1]; /* 802.3 frames */
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if (qhead->head != NULL) {
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ifp = vap->iv_ifp;
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/* XXX need different driver interface */
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/* XXX bypasses q max and OACTIVE */
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ifp_q = qhead->head;
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qhead->head = qhead->tail = NULL;
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qhead->len = 0;
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} else
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ifp = NULL;
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psq->psq_len = 0;
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IEEE80211_PSQ_UNLOCK(psq);
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/* NB: do this outside the psq lock */
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/* XXX packets might get reordered if parent is OACTIVE */
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/* parent frames, should be encapsulated */
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if (parent != NULL) {
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while (parent_q != NULL) {
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m = parent_q;
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parent_q = m->m_nextpkt;
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m->m_nextpkt = NULL;
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/* must be encapsulated */
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KASSERT((m->m_flags & M_ENCAP),
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("%s: parentq with non-M_ENCAP frame!\n",
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__func__));
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/*
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* For encaped frames, we need to free the node
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* reference upon failure.
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*/
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if (ieee80211_parent_xmitpkt(ic, m) != 0)
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ieee80211_free_node(ni);
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}
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}
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/* VAP frames, aren't encapsulated */
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if (ifp != NULL) {
|
|
while (ifp_q != NULL) {
|
|
m = ifp_q;
|
|
ifp_q = m->m_nextpkt;
|
|
m->m_nextpkt = NULL;
|
|
KASSERT((!(m->m_flags & M_ENCAP)),
|
|
("%s: vapq with M_ENCAP frame!\n", __func__));
|
|
(void) ieee80211_vap_xmitpkt(vap, m);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle station power-save state change.
|
|
*/
|
|
void
|
|
ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
|
|
{
|
|
struct ieee80211vap *vap = ni->ni_vap;
|
|
int update;
|
|
|
|
update = 0;
|
|
if (enable) {
|
|
if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
|
|
vap->iv_ps_sta++;
|
|
update = 1;
|
|
}
|
|
ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
|
|
"power save mode on, %u sta's in ps mode", vap->iv_ps_sta);
|
|
|
|
if (update)
|
|
vap->iv_update_ps(vap, vap->iv_ps_sta);
|
|
} else {
|
|
if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
|
|
vap->iv_ps_sta--;
|
|
update = 1;
|
|
}
|
|
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
|
|
"power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
|
|
|
|
/* NB: order here is intentional so TIM is clear before flush */
|
|
if (vap->iv_set_tim != NULL)
|
|
vap->iv_set_tim(ni, 0);
|
|
if (update) {
|
|
/* NB if no sta's in ps, driver should flush mc q */
|
|
vap->iv_update_ps(vap, vap->iv_ps_sta);
|
|
}
|
|
if (ni->ni_psq.psq_len != 0)
|
|
pwrsave_flushq(ni);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle power-save state change in station mode.
|
|
*/
|
|
void
|
|
ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
|
|
{
|
|
struct ieee80211_node *ni = vap->iv_bss;
|
|
|
|
if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
|
|
return;
|
|
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
|
|
"sta power save mode %s", enable ? "on" : "off");
|
|
if (!enable) {
|
|
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
|
|
ieee80211_send_nulldata(ieee80211_ref_node(ni));
|
|
/*
|
|
* Flush any queued frames; we can do this immediately
|
|
* because we know they'll be queued behind the null
|
|
* data frame we send the ap.
|
|
* XXX can we use a data frame to take us out of ps?
|
|
*/
|
|
if (ni->ni_psq.psq_len != 0)
|
|
pwrsave_flushq(ni);
|
|
} else {
|
|
ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
|
|
ieee80211_send_nulldata(ieee80211_ref_node(ni));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle being notified that we have data available for us in a TIM/ATIM.
|
|
*
|
|
* This may schedule a transition from _SLEEP -> _RUN if it's appropriate.
|
|
*/
|
|
void
|
|
ieee80211_sta_tim_notify(struct ieee80211vap *vap, int set)
|
|
{
|
|
/*
|
|
* Schedule the driver state change. It'll happen at some point soon.
|
|
* Since the hardware shouldn't know that we're running just yet
|
|
* (and thus tell the peer that we're awake before we actually wake
|
|
* up said hardware), we leave the actual node state transition
|
|
* up to the transition to RUN.
|
|
*
|
|
* XXX TODO: verify that the transition to RUN will wake up the
|
|
* BSS node!
|
|
*/
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, "%s: TIM=%d\n", __func__, set);
|
|
IEEE80211_LOCK(vap->iv_ic);
|
|
if (set == 1 && vap->iv_state == IEEE80211_S_SLEEP) {
|
|
ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
|
|
}
|
|
IEEE80211_UNLOCK(vap->iv_ic);
|
|
}
|
|
|
|
/*
|
|
* Timer check on whether the VAP has had any transmit activity.
|
|
*
|
|
* This may schedule a transition from _RUN -> _SLEEP if it's appropriate.
|
|
*/
|
|
void
|
|
ieee80211_sta_ps_timer_check(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
|
|
/* XXX lock assert */
|
|
|
|
/* For no, only do this in STA mode */
|
|
if (! (vap->iv_caps & IEEE80211_C_SWSLEEP))
|
|
goto out;
|
|
|
|
if (vap->iv_opmode != IEEE80211_M_STA)
|
|
goto out;
|
|
|
|
/* If we're not at run state, bail */
|
|
if (vap->iv_state != IEEE80211_S_RUN)
|
|
goto out;
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
|
|
"%s: lastdata=%llu, ticks=%llu\n",
|
|
__func__, (unsigned long long) ic->ic_lastdata,
|
|
(unsigned long long) ticks);
|
|
|
|
/* If powersave is disabled on the VAP, don't bother */
|
|
if (! (vap->iv_flags & IEEE80211_F_PMGTON))
|
|
goto out;
|
|
|
|
/* If we've done any data within our idle interval, bail */
|
|
/* XXX hard-coded to one second for now, ew! */
|
|
if (time_after(ic->ic_lastdata + 500, ticks))
|
|
goto out;
|
|
|
|
/*
|
|
* Signify we're going into power save and transition the
|
|
* node to powersave.
|
|
*/
|
|
if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
|
|
vap->iv_sta_ps(vap, 1);
|
|
|
|
/*
|
|
* XXX The driver has to handle the fact that we're going
|
|
* to sleep but frames may still be transmitted;
|
|
* hopefully it and/or us will do the right thing and mark any
|
|
* transmitted frames with PWRMGT set to 1.
|
|
*/
|
|
ieee80211_new_state_locked(vap, IEEE80211_S_SLEEP, 0);
|
|
|
|
IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
|
|
"%s: time delta=%d msec\n", __func__,
|
|
(int) ticks_to_msecs(ticks - ic->ic_lastdata));
|
|
|
|
out:
|
|
return;
|
|
}
|