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New ap-side power save implementation; the main change is to allow drivers

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to queue frames previously encapsulated on a separate high priority list
that is dispatched before the unencapsulated frames (to preserve order).
This commit is contained in:
Sam Leffler 2008-10-26 01:04:46 +00:00
parent 99f1b25c9f
commit 63092fce49
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=184288
8 changed files with 287 additions and 115 deletions
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41
sys/net80211/ieee80211_freebsd.h
View File

@ -112,41 +112,14 @@ typedef struct {
} while (0)
/*
* Per-node power-save queue definitions.
* Power-save queue definitions.
*/
#define IEEE80211_NODE_SAVEQ_INIT(_ni, _name) do { \
mtx_init(&(_ni)->ni_savedq.ifq_mtx, _name, "802.11 ps queue", MTX_DEF);\
(_ni)->ni_savedq.ifq_maxlen = IEEE80211_PS_MAX_QUEUE; \
} while (0)
#define IEEE80211_NODE_SAVEQ_DESTROY(_ni) \
mtx_destroy(&(_ni)->ni_savedq.ifq_mtx)
#define IEEE80211_NODE_SAVEQ_QLEN(_ni) \
_IF_QLEN(&(_ni)->ni_savedq)
#define IEEE80211_NODE_SAVEQ_LOCK(_ni) do { \
IF_LOCK(&(_ni)->ni_savedq); \
} while (0)
#define IEEE80211_NODE_SAVEQ_UNLOCK(_ni) do { \
IF_UNLOCK(&(_ni)->ni_savedq); \
} while (0)
#define IEEE80211_NODE_SAVEQ_DEQUEUE(_ni, _m, _qlen) do { \
IEEE80211_NODE_SAVEQ_LOCK(_ni); \
_IF_DEQUEUE(&(_ni)->ni_savedq, _m); \
(_qlen) = IEEE80211_NODE_SAVEQ_QLEN(_ni); \
IEEE80211_NODE_SAVEQ_UNLOCK(_ni); \
} while (0)
#define IEEE80211_NODE_SAVEQ_DRAIN(_ni, _qlen) do { \
IEEE80211_NODE_SAVEQ_LOCK(_ni); \
(_qlen) = IEEE80211_NODE_SAVEQ_QLEN(_ni); \
_IF_DRAIN(&(_ni)->ni_savedq); \
IEEE80211_NODE_SAVEQ_UNLOCK(_ni); \
} while (0)
/* XXX could be optimized */
#define _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(_ni, _m) do { \
_IF_DEQUEUE(&(_ni)->ni_savedq, m); \
} while (0)
#define _IEEE80211_NODE_SAVEQ_ENQUEUE(_ni, _m, _qlen, _age) do {\
_AGEQ_ENQUEUE(&ni->ni_savedq, _m, _qlen, _age); \
} while (0)
typedef struct mtx ieee80211_psq_lock_t;
#define IEEE80211_PSQ_INIT(_psq, _name) \
mtx_init(&(_psq)->psq_lock, _name, "802.11 ps q", MTX_DEF);
#define IEEE80211_PSQ_DESTROY(_psq) mtx_destroy(&(_psq)->psq_lock)
#define IEEE80211_PSQ_LOCK(_psq) mtx_lock(&(_psq)->psq_lock)
#define IEEE80211_PSQ_UNLOCK(_psq) mtx_unlock(&(_psq)->psq_lock)
#ifndef IF_PREPEND_LIST
#define _IF_PREPEND_LIST(ifq, mhead, mtail, mcount) do { \

9
sys/net80211/ieee80211_hostap.c
View File

@ -2171,7 +2171,7 @@ hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_frame_min *wh;
struct ifnet *ifp = vap->iv_ifp;
struct ifnet *ifp;
struct mbuf *m;
uint16_t aid;
int qlen;
@ -2208,7 +2208,7 @@ hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
}
/* Okay, take the first queued packet and put it out... */
IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen);
m = ieee80211_node_psq_dequeue(ni, &qlen);
if (m == NULL) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
"%s", "recv ps-poll, but queue empty");
@ -2234,6 +2234,11 @@ hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
vap->iv_set_tim(ni, 0);
}
m->m_flags |= M_PWR_SAV; /* bypass PS handling */
if (m->m_flags & M_ENCAP)
ifp = vap->iv_ic->ic_ifp;
else
ifp = vap->iv_ifp;
IF_ENQUEUE(&ifp->if_snd, m);
if_start(ifp);
}

13
sys/net80211/ieee80211_node.c
View File

@ -904,7 +904,7 @@ node_cleanup(struct ieee80211_node *ni)
/*
* Drain power save queue and, if needed, clear TIM.
*/
if (ieee80211_node_saveq_drain(ni) != 0 && vap->iv_set_tim != NULL)
if (ieee80211_node_psq_drain(ni) != 0 && vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0);
ni->ni_associd = 0;
@ -943,7 +943,7 @@ node_free(struct ieee80211_node *ni)
ic->ic_node_cleanup(ni);
ieee80211_ies_cleanup(&ni->ni_ies);
IEEE80211_NODE_SAVEQ_DESTROY(ni);
ieee80211_psq_cleanup(&ni->ni_psq);
IEEE80211_NODE_WDSQ_DESTROY(ni);
FREE(ni, M_80211_NODE);
}
@ -958,9 +958,8 @@ node_age(struct ieee80211_node *ni)
/*
* Age frames on the power save queue.
*/
if (ieee80211_node_saveq_age(ni) != 0 &&
IEEE80211_NODE_SAVEQ_QLEN(ni) == 0 &&
vap->iv_set_tim != NULL)
if (ieee80211_node_psq_age(ni) != 0 &&
ni->ni_psq.psq_len == 0 && vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0);
/*
* Age frames on the wds pending queue.
@ -1031,7 +1030,7 @@ ieee80211_alloc_node(struct ieee80211_node_table *nt,
ni->ni_inact_reload = nt->nt_inact_init;
ni->ni_inact = ni->ni_inact_reload;
ni->ni_ath_defkeyix = 0x7fff;
IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
ieee80211_psq_init(&ni->ni_psq, "unknown");
IEEE80211_NODE_WDSQ_INIT(ni, "unknown");
IEEE80211_NODE_LOCK(nt);
@ -1081,7 +1080,7 @@ ieee80211_tmp_node(struct ieee80211vap *vap,
IEEE80211_KEYIX_NONE);
ni->ni_txpower = bss->ni_txpower;
/* XXX optimize away */
IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
ieee80211_psq_init(&ni->ni_psq, "unknown");
IEEE80211_NODE_WDSQ_INIT(ni, "unknown");
} else {
/* XXX msg */

2
sys/net80211/ieee80211_node.h
View File

@ -185,7 +185,7 @@ struct ieee80211_node {
short ni_inact; /* inactivity mark count */
short ni_inact_reload;/* inactivity reload value */
int ni_txrate; /* legacy rate/MCS */
struct ifqueue ni_savedq; /* ps-poll queue */
struct ieee80211_psq ni_psq; /* power save queue */
struct ieee80211_nodestats ni_stats; /* per-node statistics */
struct ieee80211vap *ni_wdsvap; /* associated WDS vap */

2
sys/net80211/ieee80211_output.c
View File

@ -225,7 +225,7 @@ ieee80211_start(struct ifnet *ifp)
* the frame back when the time is right.
* XXX lose WDS vap linkage?
*/
ieee80211_pwrsave(ni, m);
(void) ieee80211_pwrsave(ni, m);
ieee80211_free_node(ni);
continue;
}

293
sys/net80211/ieee80211_power.c
View File

@ -99,21 +99,112 @@ ieee80211_power_vdetach(struct ieee80211vap *vap)
}
}
void
ieee80211_psq_init(struct ieee80211_psq *psq, const char *name)
{
memset(psq, 0, sizeof(psq));
psq->psq_maxlen = IEEE80211_PS_MAX_QUEUE;
IEEE80211_PSQ_INIT(psq, name); /* OS-dependent setup */
}
void
ieee80211_psq_cleanup(struct ieee80211_psq *psq)
{
#if 0
psq_drain(psq); /* XXX should not be needed? */
#else
KASSERT(psq->psq_len == 0, ("%d frames on ps q", psq->psq_len));
#endif
IEEE80211_PSQ_DESTROY(psq); /* OS-dependent cleanup */
}
/*
* Clear any frames queued on a node's power save queue.
* Return the highest priority frame in the ps queue.
*/
struct mbuf *
ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen)
{
struct ieee80211_psq *psq = &ni->ni_psq;
struct ieee80211_psq_head *qhead;
struct mbuf *m;
IEEE80211_PSQ_LOCK(psq);
qhead = &psq->psq_head[0];
again:
if ((m = qhead->head) != NULL) {
if ((qhead->head = m->m_nextpkt) == NULL)
qhead->tail = NULL;
KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
qhead->len--;
KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
psq->psq_len--;
m->m_nextpkt = NULL;
}
if (m == NULL && qhead == &psq->psq_head[0]) {
/* Algol-68 style for loop */
qhead = &psq->psq_head[1];
goto again;
}
if (qlen != NULL)
*qlen = psq->psq_len;
IEEE80211_PSQ_UNLOCK(psq);
return m;
}
/*
* Reclaim an mbuf from the ps q. If marked with M_ENCAP
* we assume there is a node reference that must be relcaimed.
*/
static void
psq_mfree(struct mbuf *m)
{
if (m->m_flags & M_ENCAP) {
struct ieee80211_node *ni = (void *) m->m_pkthdr.rcvif;
ieee80211_free_node(ni);
}
m->m_nextpkt = NULL;
m_freem(m);
}
/*
* Clear any frames queued in the power save queue.
* The number of frames that were present is returned.
*/
static int
psq_drain(struct ieee80211_psq *psq)
{
struct ieee80211_psq_head *qhead;
struct mbuf *m;
int qlen;
IEEE80211_PSQ_LOCK(psq);
qlen = psq->psq_len;
qhead = &psq->psq_head[0];
again:
while ((m = qhead->head) != NULL) {
qhead->head = m->m_nextpkt;
psq_mfree(m);
}
qhead->tail = NULL;
qhead->len = 0;
if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
qhead = &psq->psq_head[1];
goto again;
}
psq->psq_len = 0;
IEEE80211_PSQ_UNLOCK(psq);
return qlen;
}
/*
* Clear any frames queued in the power save queue.
* The number of frames that were present is returned.
*/
int
ieee80211_node_saveq_drain(struct ieee80211_node *ni)
ieee80211_node_psq_drain(struct ieee80211_node *ni)
{
int qlen;
IEEE80211_NODE_SAVEQ_LOCK(ni);
qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
_IF_DRAIN(&ni->ni_savedq);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
return qlen;
return psq_drain(&ni->ni_psq);
}
/*
@ -127,28 +218,41 @@ ieee80211_node_saveq_drain(struct ieee80211_node *ni)
* can check if it needs to adjust the tim.
*/
int
ieee80211_node_saveq_age(struct ieee80211_node *ni)
ieee80211_node_psq_age(struct ieee80211_node *ni)
{
struct ieee80211_psq *psq = &ni->ni_psq;
int discard = 0;
if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
if (psq->psq_len != 0) {
#ifdef IEEE80211_DEBUG
struct ieee80211vap *vap = ni->ni_vap;
#endif
struct ieee80211_psq_head *qhead;
struct mbuf *m;
IEEE80211_NODE_SAVEQ_LOCK(ni);
while (IF_POLL(&ni->ni_savedq, m) != NULL &&
M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
IEEE80211_PSQ_LOCK(psq);
qhead = &psq->psq_head[0];
again:
while ((m = qhead->head) != NULL &&
M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"discard frame, age %u", M_AGE_GET(m));
_IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
m_freem(m);
if ((qhead->head = m->m_nextpkt) == NULL)
qhead->tail = NULL;
KASSERT(qhead->len > 0, ("qhead len %d", qhead->len));
qhead->len--;
KASSERT(psq->psq_len > 0, ("psq len %d", psq->psq_len));
psq->psq_len--;
psq_mfree(m);
discard++;
}
if (qhead == &psq->psq_head[0]) { /* Algol-68 style for loop */
qhead = &psq->psq_head[1];
goto again;
}
if (m != NULL)
M_AGE_SUB(m, IEEE80211_INACT_WAIT);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
IEEE80211_PSQ_UNLOCK(psq);
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"discard %u frames for age", discard);
@ -211,82 +315,143 @@ ieee80211_set_tim(struct ieee80211_node *ni, int set)
* The new packet is placed on the node's saved queue, and the TIM
* is changed, if necessary.
*/
void
int
ieee80211_pwrsave(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211_psq *psq = &ni->ni_psq;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_psq_head *qhead;
int qlen, age;
IEEE80211_NODE_SAVEQ_LOCK(ni);
if (_IF_QFULL(&ni->ni_savedq)) {
_IF_DROP(&ni->ni_savedq);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
IEEE80211_PSQ_LOCK(psq);
if (psq->psq_len >= psq->psq_maxlen) {
psq->psq_drops++;
IEEE80211_PSQ_UNLOCK(psq);
IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
"pwr save q overflow, drops %d (size %d)",
ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE);
psq->psq_drops, psq->psq_len);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_dumppkts(vap))
ieee80211_dump_pkt(ni->ni_ic, mtod(m, caddr_t),
m->m_len, -1, -1);
#endif
m_freem(m);
return;
psq_mfree(m);
return ENOSPC;
}
/*
* Tag the frame with it's 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.
* Tag the frame with it's expiry time and insert it in
* the appropriate 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.
*/
/* TU -> secs. XXX handle overflow? */
age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
_IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
/*
* Encapsulated frames go on the high priority queue,
* other stuff goes on the low priority queue. We use
* this to order frames returned out of the driver
* ahead of frames we collect in ieee80211_start.
*/
if (m->m_flags & M_ENCAP)
qhead = &psq->psq_head[0];
else
qhead = &psq->psq_head[1];
if (qhead->tail == NULL) {
struct mbuf *mh;
qhead->head = m;
/*
* Take care to adjust age when inserting the first
* frame of a queue and the other queue already has
* frames. We need to preserve the age difference
* relationship so ieee80211_node_psq_age works.
*/
if (qhead == &psq->psq_head[1]) {
mh = psq->psq_head[0].head;
if (mh != NULL)
age-= M_AGE_GET(mh);
} else {
mh = psq->psq_head[1].head;
if (mh != NULL) {
int nage = M_AGE_GET(mh) - age;
/* XXX is clamping to zero good 'nuf? */
M_AGE_SET(mh, nage < 0 ? 0 : nage);
}
}
} else {
qhead->tail->m_nextpkt = m;
age -= M_AGE_GET(qhead->head);
}
KASSERT(age >= 0, ("age %d", age));
M_AGE_SET(m, age);
m->m_nextpkt = NULL;
qhead->tail = m;
qhead->len++;
qlen = ++(psq->psq_len);
IEEE80211_PSQ_UNLOCK(psq);
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"save frame with age %d, %u now queued", age, qlen);
if (qlen == 1 && vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 1);
return 0;
}
/*
* Unload the frames from the ps q but don't send them
* to the driver yet. We do this in two stages to minimize
* locking but also because there's no easy way to preserve
* ordering given the existing ifnet access mechanisms.
* XXX could be optimized
* Move frames from the ps q to the vap's send queue
* and/or the driver's send queue; and kick the start
* method for each, as appropriate. Note we're careful
* to preserve packet ordering here.
*/
static void
pwrsave_flushq(struct ieee80211_node *ni)
{
struct mbuf *m, *mhead, *mtail;
int mcount;
struct ieee80211_psq *psq = &ni->ni_psq;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_psq_head *qhead;
struct ifnet *parent, *ifp;
IEEE80211_NODE_SAVEQ_LOCK(ni);
mcount = IEEE80211_NODE_SAVEQ_QLEN(ni);
mhead = mtail = NULL;
for (;;) {
_IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
if (m == NULL)
break;
if (mhead == NULL) {
mhead = m;
m->m_nextpkt = NULL;
} else
mtail->m_nextpkt = m;
mtail = m;
}
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
if (mhead != NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"flush ps queue, %u packets queued", psq->psq_len);
IEEE80211_PSQ_LOCK(psq);
qhead = &psq->psq_head[0]; /* 802.11 frames */
if (qhead->head != NULL) {
/* XXX could dispatch through vap and check M_ENCAP */
parent = vap->iv_ic->ic_ifp;
/* XXX need different driver interface */
/* XXX bypasses q max and OACTIVE */
struct ifnet *ifp = ni->ni_vap->iv_ifp;
IF_PREPEND_LIST(&ifp->if_snd, mhead, mtail, mcount);
IF_PREPEND_LIST(&parent->if_snd, qhead->head, qhead->tail,
qhead->len);
qhead->head = qhead->tail = NULL;
qhead->len = 0;
} else
parent = NULL;
qhead = &psq->psq_head[1]; /* 802.3 frames */
if (qhead->head != NULL) {
ifp = vap->iv_ifp;
/* XXX need different driver interface */
/* XXX bypasses q max and OACTIVE */
IF_PREPEND_LIST(&ifp->if_snd, qhead->head, qhead->tail,
qhead->len);
qhead->head = qhead->tail = NULL;
qhead->len = 0;
} else
ifp = NULL;
psq->psq_len = 0;
IEEE80211_PSQ_UNLOCK(psq);
/* NB: do this outside the psq lock */
/* XXX packets might get reordered if parent is OACTIVE */
if (parent != NULL)
if_start(parent);
if (ifp != NULL)
if_start(ifp);
}
}
/*
@ -326,7 +491,8 @@ ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
/* NB if no sta's in ps, driver should flush mc q */
vap->iv_update_ps(vap, vap->iv_ps_sta);
}
pwrsave_flushq(ni);
if (ni->ni_psq.psq_len != 0)
pwrsave_flushq(ni);
}
}
@ -337,7 +503,6 @@ void
ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
{
struct ieee80211_node *ni = vap->iv_bss;
int qlen;
if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
return;
@ -353,12 +518,8 @@ ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable)
* data frame we send the ap.
* XXX can we use a data frame to take us out of ps?
*/
qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
if (qlen != 0) {
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"flush ps queue, %u packets queued", qlen);
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));

40
sys/net80211/ieee80211_power.h
View File

@ -28,6 +28,39 @@
#define _NET80211_IEEE80211_POWER_H_
struct ieee80211com;
struct ieee80211vap;
struct ieee80211_node;
struct mbuf;
/*
* Power save packet queues. There are two queues, one
* for frames coming from the net80211 layer and the other
* for frames that come from the driver. Frames from the
* driver are expected to have M_ENCAP marked to indicate
* they have already been encapsulated and are treated as
* higher priority: they are sent first when flushing the
* queue on a power save state change or in response to a
* ps-poll frame.
*
* Note that frames sent from the high priority queue are
* fed directly to the driver without going through
* ieee80211_start again; drivers that send up encap'd
* frames are required to handle them when they come back.
*/
struct ieee80211_psq {
ieee80211_psq_lock_t psq_lock;
int psq_len;
int psq_maxlen;
int psq_drops;
struct ieee80211_psq_head {
struct mbuf *head;
struct mbuf *tail;
int len;
} psq_head[2]; /* 2 priorities */
};
void ieee80211_psq_init(struct ieee80211_psq *, const char *);
void ieee80211_psq_cleanup(struct ieee80211_psq *);
void ieee80211_power_attach(struct ieee80211com *);
void ieee80211_power_detach(struct ieee80211com *);
@ -35,9 +68,10 @@ void ieee80211_power_vattach(struct ieee80211vap *);
void ieee80211_power_vdetach(struct ieee80211vap *);
void ieee80211_power_latevattach(struct ieee80211vap *);
int ieee80211_node_saveq_drain(struct ieee80211_node *);
int ieee80211_node_saveq_age(struct ieee80211_node *);
void ieee80211_pwrsave(struct ieee80211_node *, struct mbuf *);
struct mbuf *ieee80211_node_psq_dequeue(struct ieee80211_node *ni, int *qlen);
int ieee80211_node_psq_drain(struct ieee80211_node *);
int ieee80211_node_psq_age(struct ieee80211_node *);
int ieee80211_pwrsave(struct ieee80211_node *, struct mbuf *);
void ieee80211_node_pwrsave(struct ieee80211_node *, int enable);
void ieee80211_sta_pwrsave(struct ieee80211vap *, int enable);

2
sys/net80211/ieee80211_var.h
View File

@ -47,8 +47,8 @@
#include <net80211/ieee80211_crypto.h>
#include <net80211/ieee80211_dfs.h>
#include <net80211/ieee80211_ioctl.h> /* for ieee80211_stats */
#include <net80211/ieee80211_node.h>
#include <net80211/ieee80211_power.h>
#include <net80211/ieee80211_node.h>
#include <net80211/ieee80211_proto.h>
#include <net80211/ieee80211_scan.h>