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madwifi/net80211/ieee80211_power.c

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id$
*/
#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif
/*
* IEEE 802.11 power save support.
*/
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include "if_media.h"
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_proto.h>
static void ieee80211_set_tim(struct ieee80211_node *ni, int set);
void
ieee80211_power_attach(struct ieee80211com *ic)
{
}
void
ieee80211_power_detach(struct ieee80211com *ic)
{
}
void
ieee80211_power_vattach(struct ieee80211vap *vap)
{
if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
vap->iv_opmode == IEEE80211_M_IBSS) {
/* NB: driver should override */
vap->iv_set_tim = ieee80211_set_tim;
}
}
void
ieee80211_power_latevattach(struct ieee80211vap *vap)
{
/*
* Allocate these only if needed. Beware that we
* know adhoc mode doesn't support ATIM yet...
*/
if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
vap->iv_tim_len = howmany(vap->iv_max_aid, 8) * sizeof(u_int8_t);
MALLOC(vap->iv_tim_bitmap, u_int8_t *, vap->iv_tim_len,
M_DEVBUF, M_NOWAIT | M_ZERO);
if (vap->iv_tim_bitmap == NULL) {
printk(KERN_ERR "%s: no memory for TIM bitmap!\n", __func__);
/* XXX good enough to keep from crashing? */
vap->iv_tim_len = 0;
}
}
}
void
ieee80211_power_vdetach(struct ieee80211vap *vap)
{
if (vap->iv_tim_bitmap != NULL) {
FREE(vap->iv_tim_bitmap, M_DEVBUF);
vap->iv_tim_bitmap = NULL;
}
}
/*
* Clear any frames queued on a node's power save queue.
* The number of frames that were present is returned.
*/
int
ieee80211_node_saveq_drain(struct ieee80211_node *ni)
{
struct sk_buff *skb;
int qlen;
IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
while ((skb = __skb_dequeue(&ni->ni_savedq)) != NULL) {
if (SKB_NI(skb) != NULL)
ieee80211_unref_node(&SKB_NI(skb));
ieee80211_dev_kfree_skb(&skb);
}
IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
return qlen;
}
/*
* Age frames on the power save queue. The aging interval is
* 4 times the listen interval specified by the station. This
* number is factored into the age calculations when the frame
* is placed on the queue. We store ages as time differences
* so we can check and/or adjust only the head of the list.
* If a frame's age exceeds the threshold then discard it.
* The number of frames discarded is returned so the caller
* can check if it needs to adjust the tim.
*/
int
ieee80211_node_saveq_age(struct ieee80211_node *ni)
{
int discard = 0;
/* XXX racey but good 'nuf? */
if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
#ifdef IEEE80211_DEBUG
struct ieee80211vap *vap = ni->ni_vap;
#endif
struct sk_buff *skb;
IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
while ((skb = skb_peek(&ni->ni_savedq)) != NULL &&
M_AGE_GET(skb) < IEEE80211_INACT_WAIT) {
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"discard frame, age %u", M_AGE_GET(skb));
skb = __skb_dequeue(&ni->ni_savedq);
if (SKB_NI(skb) != NULL)
ieee80211_unref_node(&SKB_NI(skb));
ieee80211_dev_kfree_skb(&skb);
discard++;
}
if (skb != NULL)
M_AGE_SUB(skb, IEEE80211_INACT_WAIT);
IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"discard %u frames for age", discard);
IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard);
}
return discard;
}
/*
* Indicate whether there are frames queued for a station in power-save mode.
*/
static void
ieee80211_set_tim(struct ieee80211_node *ni, int set)
{
struct ieee80211vap *vap = ni->ni_vap;
u_int16_t aid;
KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
vap->iv_opmode == IEEE80211_M_IBSS,
("operating mode %u", vap->iv_opmode));
aid = IEEE80211_AID(ni->ni_associd);
KASSERT(aid < vap->iv_max_aid,
("bogus aid %u, max %u", aid, vap->iv_max_aid));
IEEE80211_LOCK_IRQ(ni->ni_ic);
if (set != (isset(vap->iv_tim_bitmap, aid) != 0)) {
if (set) {
setbit(vap->iv_tim_bitmap, aid);
vap->iv_ps_pending++;
} else {
clrbit(vap->iv_tim_bitmap, aid);
vap->iv_ps_pending--;
}
vap->iv_flags |= IEEE80211_F_TIMUPDATE;
}
IEEE80211_UNLOCK_IRQ(ni->ni_ic);
}
/*
* Save an outbound packet for a node in power-save sleep state.
* The new packet is placed on the node's saved queue, and the TIM
* is changed, if necessary.
* It must return either NETDEV_TX_OK or NETDEV_TX_BUSY
*/
int
ieee80211_pwrsave(struct sk_buff *skb)
{
struct ieee80211_node *ni = SKB_NI(skb);
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct sk_buff *tail;
int qlen, age;
IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
if (IEEE80211_NODE_SAVEQ_QLEN(ni) >= IEEE80211_PS_MAX_QUEUE) {
IEEE80211_NODE_STAT(ni, psq_drops);
IEEE80211_NODE_SAVEQ_UNLOCK_IRQ_EARLY(ni);
IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
"pwr save q overflow, drops %d (size %d)",
ni->ni_stats.ns_psq_drops, IEEE80211_PS_MAX_QUEUE);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_dumppkts(vap))
ieee80211_dump_pkt(ni->ni_ic, skb->data,
skb->len, -1, -1, 1);
#endif
if (SKB_NI(skb) != NULL)
ieee80211_unref_node(&SKB_NI(skb));
ieee80211_dev_kfree_skb(&skb);
return NETDEV_TX_OK;
}
/*
* Tag the frame with its expiry time and insert
* it in the queue. The aging interval is 4 times
* the listen interval specified by the station.
* Frames that sit around too long are reclaimed
* using this information.
*/
/* XXX handle overflow? */
age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; /* TU -> secs */
tail = skb_peek_tail(&ni->ni_savedq);
if (tail != NULL) {
age -= M_AGE_GET(tail);
__skb_queue_after(&ni->ni_savedq, tail, skb);
} else
__skb_queue_head(&ni->ni_savedq, skb);
M_AGE_SET(skb, age);
qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"save frame, %u now queued", qlen);
if (qlen == 1 && vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 1);
return NETDEV_TX_OK;
}
/*
* Handle power-save state change in ap/ibss mode.
*/
void
ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
{
struct ieee80211vap *vap = ni->ni_vap;
KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP ||
vap->iv_opmode == IEEE80211_M_IBSS,
("unexpected operating mode %u", vap->iv_opmode));
if (enable) {
if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
vap->iv_ps_sta++;
ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"power save mode on, %u STAs in PS mode",
vap->iv_ps_sta);
} else {
if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT))
vap->iv_ps_sta--;
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"power save mode off, %u STAs in PS mode",
vap->iv_ps_sta);
/* XXX if no stations in ps mode, flush mc frames */
/*
* Flush queued unicast frames.
*/
if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) {
if (vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0); /* just in case */
return;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"flush ps queue, %u packets queued",
IEEE80211_NODE_SAVEQ_QLEN(ni));
for (;;) {
struct sk_buff *skb;
int qlen;
IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
IEEE80211_NODE_SAVEQ_DEQUEUE(ni, skb, qlen);
IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
if (skb == NULL)
break;
/*
* If this is the last packet, turn off the TIM bit.
*
* Set the M_PWR_SAV bit on skb to allow encap to test for
* adding MORE_DATA bit to wh.
*
* The 802.11 MAC Spec says we should only set MORE_DATA for
* unicast packets when the STA is in PS mode (7.1.3.1.8);
* which it isn't.
*/
#if 0
M_PWR_SAV_SET(skb);
#endif
#ifdef ATH_SUPERG_XR
/*
* if it is a XR vap, send the data to associated normal net
* device. XR vap has a net device which is not registered with
* OS.
*/
if (vap->iv_xrvap && vap->iv_flags & IEEE80211_F_XR)
skb->dev = vap->iv_xrvap->iv_dev;
else
skb->dev = vap->iv_dev; /* XXX? unnecessary */
#endif
ieee80211_parent_queue_xmit(skb);
}
vap->iv_set_tim(ni, 0);
}
}
/*
* Handle power-save state change in station mode.
*/
void
ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
{
struct ieee80211_node *ni = vap->iv_bss;
int qlen;
if (vap->iv_opmode != IEEE80211_M_STA)
return;
if (!!enable == !!IEEE80211_VAP_IS_SLEEPING(vap)) /* Bool. normalise */
return;
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"STA power save mode %s", enable ? "on" : "off");
if (!enable) {
IEEE80211_VAP_WAKEUP(vap);
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 mode?
*/
qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
if (qlen != 0) {
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"flush PS queue, %u packets queued", qlen);
for (;;) {
struct sk_buff *skb;
IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni);
skb = __skb_dequeue(&ni->ni_savedq);
IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni);
if (skb == NULL)
break;
ieee80211_parent_queue_xmit(skb);
}
}
} else {
IEEE80211_VAP_GOTOSLEEP(vap);
ieee80211_send_nulldata(ieee80211_ref_node(ni));
}
}
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