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29bd2010d4
freebsd-dev/sys/net80211/ieee80211_tdma.c
Weongyo Jeong 7e62e45f53 fixes a broken software beacon miss handler. There is a race to check 
vap->iv_bmiss_count == 0 in ieee80211_swbmiss because iv_swbmiss_task is
enqueued by taskqueue.

Reviewed by:	rpaulo
2010-03-14 01:57:32 +00:00

821 lines
24 KiB
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/*-
* Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
* Copyright (c) 2007-2009 Intel Corporation
* 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.
*
* 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.
*/
#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
/*
* IEEE 802.11 TDMA mode support.
*/
#include "opt_inet.h"
#include "opt_tdma.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/if_llc.h>
#include <net/ethernet.h>
#include <net/bpf.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_tdma.h>
#include <net80211/ieee80211_input.h>
#ifndef TDMA_SLOTLEN_DEFAULT
#define TDMA_SLOTLEN_DEFAULT 10*1000 /* 10ms */
#endif
#ifndef TDMA_SLOTCNT_DEFAULT
#define TDMA_SLOTCNT_DEFAULT 2 /* 2x (pt-to-pt) */
#endif
#ifndef TDMA_BINTVAL_DEFAULT
#define TDMA_BINTVAL_DEFAULT 5 /* 5x ~= 100TU beacon intvl */
#endif
#ifndef TDMA_TXRATE_11B_DEFAULT
#define TDMA_TXRATE_11B_DEFAULT 2*11
#endif
#ifndef TDMA_TXRATE_11G_DEFAULT
#define TDMA_TXRATE_11G_DEFAULT 2*24
#endif
#ifndef TDMA_TXRATE_11A_DEFAULT
#define TDMA_TXRATE_11A_DEFAULT 2*24
#endif
#ifndef TDMA_TXRATE_TURBO_DEFAULT
#define TDMA_TXRATE_TURBO_DEFAULT 2*24
#endif
#ifndef TDMA_TXRATE_HALF_DEFAULT
#define TDMA_TXRATE_HALF_DEFAULT 2*12
#endif
#ifndef TDMA_TXRATE_QUARTER_DEFAULT
#define TDMA_TXRATE_QUARTER_DEFAULT 2*6
#endif
#ifndef TDMA_TXRATE_11NA_DEFAULT
#define TDMA_TXRATE_11NA_DEFAULT (4 | IEEE80211_RATE_MCS)
#endif
#ifndef TDMA_TXRATE_11NG_DEFAULT
#define TDMA_TXRATE_11NG_DEFAULT (4 | IEEE80211_RATE_MCS)
#endif
#define TDMA_VERSION_VALID(_version) \
(TDMA_VERSION_V2 <= (_version) && (_version) <= TDMA_VERSION)
#define TDMA_SLOTCNT_VALID(_slotcnt) \
(2 <= (_slotcnt) && (_slotcnt) <= TDMA_MAXSLOTS)
/* XXX magic constants */
#define TDMA_SLOTLEN_VALID(_slotlen) \
(2*100 <= (_slotlen) && (unsigned)(_slotlen) <= 0xfffff)
/* XXX probably should set a max */
#define TDMA_BINTVAL_VALID(_bintval) (1 <= (_bintval))
/*
* This code is not prepared to handle more than 2 slots.
*/
CTASSERT(TDMA_MAXSLOTS == 2);
static void tdma_vdetach(struct ieee80211vap *vap);
static int tdma_newstate(struct ieee80211vap *, enum ieee80211_state, int);
static void tdma_beacon_miss(struct ieee80211vap *vap);
static void tdma_recv_mgmt(struct ieee80211_node *, struct mbuf *,
int subtype, int rssi, int nf);
static int tdma_update(struct ieee80211vap *vap,
const struct ieee80211_tdma_param *tdma, struct ieee80211_node *ni,
int pickslot);
static int tdma_process_params(struct ieee80211_node *ni,
const u_int8_t *ie, int rssi, int nf, const struct ieee80211_frame *wh);
static void
settxparms(struct ieee80211vap *vap, enum ieee80211_phymode mode, int rate)
{
vap->iv_txparms[mode].ucastrate = rate;
vap->iv_txparms[mode].mcastrate = rate;
}
static void
setackpolicy(struct ieee80211com *ic, int noack)
{
struct ieee80211_wme_state *wme = &ic->ic_wme;
int ac;
for (ac = 0; ac < WME_NUM_AC; ac++) {
wme->wme_chanParams.cap_wmeParams[ac].wmep_noackPolicy = noack;
wme->wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy = noack;
}
}
void
ieee80211_tdma_vattach(struct ieee80211vap *vap)
{
struct ieee80211_tdma_state *ts;
KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
("not a tdma vap, caps 0x%x", vap->iv_caps));
ts = (struct ieee80211_tdma_state *) malloc(
sizeof(struct ieee80211_tdma_state), M_80211_VAP, M_NOWAIT | M_ZERO);
if (ts == NULL) {
printf("%s: cannot allocate TDMA state block\n", __func__);
/* NB: fall back to adhdemo mode */
vap->iv_caps &= ~IEEE80211_C_TDMA;
return;
}
/* NB: default configuration is passive so no beacons */
ts->tdma_version = TDMA_VERSION;
ts->tdma_slotlen = TDMA_SLOTLEN_DEFAULT;
ts->tdma_slotcnt = TDMA_SLOTCNT_DEFAULT;
ts->tdma_bintval = TDMA_BINTVAL_DEFAULT;
ts->tdma_slot = 1; /* passive operation */
/* setup default fixed rates */
settxparms(vap, IEEE80211_MODE_11A, TDMA_TXRATE_11A_DEFAULT);
settxparms(vap, IEEE80211_MODE_11B, TDMA_TXRATE_11B_DEFAULT);
settxparms(vap, IEEE80211_MODE_11G, TDMA_TXRATE_11G_DEFAULT);
settxparms(vap, IEEE80211_MODE_TURBO_A, TDMA_TXRATE_TURBO_DEFAULT);
settxparms(vap, IEEE80211_MODE_TURBO_G, TDMA_TXRATE_TURBO_DEFAULT);
settxparms(vap, IEEE80211_MODE_STURBO_A, TDMA_TXRATE_TURBO_DEFAULT);
settxparms(vap, IEEE80211_MODE_11NA, TDMA_TXRATE_11NA_DEFAULT);
settxparms(vap, IEEE80211_MODE_11NG, TDMA_TXRATE_11NG_DEFAULT);
settxparms(vap, IEEE80211_MODE_HALF, TDMA_TXRATE_HALF_DEFAULT);
settxparms(vap, IEEE80211_MODE_QUARTER, TDMA_TXRATE_QUARTER_DEFAULT);
setackpolicy(vap->iv_ic, 1); /* disable ACK's */
ts->tdma_opdetach = vap->iv_opdetach;
vap->iv_opdetach = tdma_vdetach;
ts->tdma_newstate = vap->iv_newstate;
vap->iv_newstate = tdma_newstate;
vap->iv_bmiss = tdma_beacon_miss;
ts->tdma_recv_mgmt = vap->iv_recv_mgmt;
vap->iv_recv_mgmt = tdma_recv_mgmt;
vap->iv_tdma = ts;
}
static void
tdma_vdetach(struct ieee80211vap *vap)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
if (ts == NULL) {
/* NB: should not have touched any ic state */
return;
}
ts->tdma_opdetach(vap);
free(vap->iv_tdma, M_80211_VAP);
vap->iv_tdma = NULL;
setackpolicy(vap->iv_ic, 0); /* enable ACK's */
}
static void
sta_leave(void *arg, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = arg;
if (ni->ni_vap == vap && ni != vap->iv_bss)
ieee80211_node_leave(ni);
}
/*
* TDMA state machine handler.
*/
static int
tdma_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
struct ieee80211com *ic = vap->iv_ic;
enum ieee80211_state ostate;
int status;
IEEE80211_LOCK_ASSERT(ic);
ostate = vap->iv_state;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
__func__, ieee80211_state_name[ostate],
ieee80211_state_name[nstate], arg);
if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
callout_stop(&vap->iv_swbmiss);
if (nstate == IEEE80211_S_SCAN &&
(ostate == IEEE80211_S_INIT || ostate == IEEE80211_S_RUN) &&
ts->tdma_slot != 0) {
/*
* Override adhoc behaviour when operating as a slave;
* we need to scan even if the channel is locked.
*/
vap->iv_state = nstate; /* state transition */
ieee80211_cancel_scan(vap); /* background scan */
if (ostate == IEEE80211_S_RUN) {
/* purge station table; entries are stale */
ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
}
if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
ieee80211_check_scan(vap,
vap->iv_scanreq_flags,
vap->iv_scanreq_duration,
vap->iv_scanreq_mindwell,
vap->iv_scanreq_maxdwell,
vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
} else
ieee80211_check_scan_current(vap);
status = 0;
} else {
status = ts->tdma_newstate(vap, nstate, arg);
}
if (status == 0 &&
nstate == IEEE80211_S_RUN && ostate != IEEE80211_S_RUN &&
(vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) &&
ts->tdma_slot != 0 &&
vap->iv_des_chan == IEEE80211_CHAN_ANYC) {
/*
* Start s/w beacon miss timer for slave devices w/o
* hardware support. Note we do this only if we're
* not locked to a channel (i.e. roam to follow the
* master). The 2x is a fudge for our doing this in
* software.
*/
vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
2 * vap->iv_bmissthreshold * ts->tdma_bintval *
((ts->tdma_slotcnt * ts->tdma_slotlen) / 1024));
vap->iv_swbmiss_count = 0;
callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
ieee80211_swbmiss, vap);
}
return status;
}
static void
tdma_beacon_miss(struct ieee80211vap *vap)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
KASSERT((vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
KASSERT(vap->iv_state == IEEE80211_S_RUN,
("wrong state %d", vap->iv_state));
IEEE80211_DPRINTF(vap,
IEEE80211_MSG_STATE | IEEE80211_MSG_TDMA | IEEE80211_MSG_DEBUG,
"beacon miss, mode %u state %s\n",
vap->iv_opmode, ieee80211_state_name[vap->iv_state]);
callout_stop(&vap->iv_swbmiss);
if (ts->tdma_peer != NULL) { /* XXX? can this be null? */
ieee80211_notify_node_leave(vap->iv_bss);
ts->tdma_peer = NULL;
/*
* Treat beacon miss like an associate failure wrt the
* scan policy; this forces the entry in the scan cache
* to be ignored after several tries.
*/
ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr,
IEEE80211_STATUS_TIMEOUT);
}
#if 0
ts->tdma_inuse = 0; /* clear slot usage */
#endif
ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
}
static void
tdma_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
int subtype, int rssi, int nf)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_tdma_state *ts = vap->iv_tdma;
if (subtype == IEEE80211_FC0_SUBTYPE_BEACON &&
(ic->ic_flags & IEEE80211_F_SCAN) == 0) {
struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
struct ieee80211_scanparams scan;
if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
return;
if (scan.tdma == NULL) {
/*
* TDMA stations must beacon a TDMA ie; ignore
* any other station.
* XXX detect overlapping bss and change channel
*/
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "no TDMA ie");
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
if (ni == vap->iv_bss &&
!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
/*
* Fake up a node for this newly
* discovered member of the IBSS.
*/
ni = ieee80211_add_neighbor(vap, wh, &scan);
if (ni == NULL) {
/* NB: stat kept for alloc failure */
return;
}
}
/*
* Check for state updates.
*/
if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) {
/*
* Count frame now that we know it's to be processed.
*/
vap->iv_stats.is_rx_beacon++;
IEEE80211_NODE_STAT(ni, rx_beacons);
/*
* Record tsf of last beacon. NB: this must be
* done before calling tdma_process_params
* as deeper routines reference it.
*/
memcpy(&ni->ni_tstamp.data, scan.tstamp,
sizeof(ni->ni_tstamp.data));
/*
* Count beacon frame for s/w bmiss handling.
*/
vap->iv_swbmiss_count++;
/*
* Process tdma ie. The contents are used to sync
* the slot timing, reconfigure the bss, etc.
*/
(void) tdma_process_params(ni, scan.tdma, rssi, nf, wh);
return;
}
/*
* NB: defer remaining work to the adhoc code; this causes
* 2x parsing of the frame but should happen infrequently
*/
}
ts->tdma_recv_mgmt(ni, m0, subtype, rssi, nf);
}
/*
* Update TDMA state on receipt of a beacon frame with
* a TDMA information element. The sender's identity
* is provided so we can track who our peer is. If pickslot
* is non-zero we scan the slot allocation state in the ie
* to locate a free slot for our use.
*/
static int
tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma,
struct ieee80211_node *ni, int pickslot)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
int slot, slotlen, update;
KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
("not a tdma vap, caps 0x%x", vap->iv_caps));
update = 0;
if (tdma->tdma_slotcnt != ts->tdma_slotcnt) {
if (!TDMA_SLOTCNT_VALID(tdma->tdma_slotcnt)) {
if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
printf("%s: bad slot cnt %u\n",
__func__, tdma->tdma_slotcnt);
return 0;
}
update |= TDMA_UPDATE_SLOTCNT;
}
slotlen = le16toh(tdma->tdma_slotlen) * 100;
if (slotlen != ts->tdma_slotlen) {
if (!TDMA_SLOTLEN_VALID(slotlen)) {
if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
printf("%s: bad slot len %u\n",
__func__, slotlen);
return 0;
}
update |= TDMA_UPDATE_SLOTLEN;
}
if (tdma->tdma_bintval != ts->tdma_bintval) {
if (!TDMA_BINTVAL_VALID(tdma->tdma_bintval)) {
if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1))
printf("%s: bad beacon interval %u\n",
__func__, tdma->tdma_bintval);
return 0;
}
update |= TDMA_UPDATE_BINTVAL;
}
slot = ts->tdma_slot;
if (pickslot) {
/*
* Pick unoccupied slot. Note we never choose slot 0.
*/
for (slot = tdma->tdma_slotcnt-1; slot > 0; slot--)
if (isclr(tdma->tdma_inuse, slot))
break;
if (slot <= 0) {
printf("%s: no free slot, slotcnt %u inuse: 0x%x\n",
__func__, tdma->tdma_slotcnt,
tdma->tdma_inuse[0]);
/* XXX need to do something better */
return 0;
}
if (slot != ts->tdma_slot)
update |= TDMA_UPDATE_SLOT;
}
if (ni != ts->tdma_peer) {
/* update everything */
update = TDMA_UPDATE_SLOT
| TDMA_UPDATE_SLOTCNT
| TDMA_UPDATE_SLOTLEN
| TDMA_UPDATE_BINTVAL;
}
if (update) {
/*
* New/changed parameters; update runtime state.
*/
/* XXX overwrites user parameters */
if (update & TDMA_UPDATE_SLOTCNT)
ts->tdma_slotcnt = tdma->tdma_slotcnt;
if (update & TDMA_UPDATE_SLOTLEN)
ts->tdma_slotlen = slotlen;
if (update & TDMA_UPDATE_SLOT)
ts->tdma_slot = slot;
if (update & TDMA_UPDATE_BINTVAL)
ts->tdma_bintval = tdma->tdma_bintval;
/* mark beacon to be updated before next xmit */
ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
"%s: slot %u slotcnt %u slotlen %u us bintval %u\n",
__func__, ts->tdma_slot, ts->tdma_slotcnt,
ts->tdma_slotlen, ts->tdma_bintval);
}
/*
* Notify driver. Note we can be called before
* entering RUN state if we scanned and are
* joining an existing bss. In that case do not
* call the driver because not all necessary state
* has been setup. The next beacon will dtrt.
*/
if (vap->iv_state == IEEE80211_S_RUN)
vap->iv_ic->ic_tdma_update(ni, tdma, update);
/*
* Dispatch join event on first beacon from new master.
*/
if (ts->tdma_peer != ni) {
if (ts->tdma_peer != NULL)
ieee80211_notify_node_leave(vap->iv_bss);
ieee80211_notify_node_join(ni, 1);
/* NB: no reference, we just use the address */
ts->tdma_peer = ni;
}
return 1;
}
/*
* Process received TDMA parameters.
*/
static int
tdma_process_params(struct ieee80211_node *ni, const u_int8_t *ie,
int rssi, int nf, const struct ieee80211_frame *wh)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_tdma_state *ts = vap->iv_tdma;
const struct ieee80211_tdma_param *tdma =
(const struct ieee80211_tdma_param *) ie;
u_int len = ie[1];
KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
("not a tdma vap, caps 0x%x", vap->iv_caps));
if (len < sizeof(*tdma) - 2) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
wh, "tdma", "too short, len %u", len);
return IEEE80211_REASON_IE_INVALID;
}
if (tdma->tdma_version != ts->tdma_version) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
wh, "tdma", "bad version %u (ours %u)",
tdma->tdma_version, ts->tdma_version);
return IEEE80211_REASON_IE_INVALID;
}
/*
* NB: ideally we'd check against tdma_slotcnt, but that
* would require extra effort so do this easy check that
* covers the work below; more stringent checks are done
* before we make more extensive use of the ie contents.
*/
if (tdma->tdma_slot >= TDMA_MAXSLOTS) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA,
wh, "tdma", "invalid slot %u", tdma->tdma_slot);
return IEEE80211_REASON_IE_INVALID;
}
/*
* Can reach here while scanning, update
* operational state only in RUN state.
*/
if (vap->iv_state == IEEE80211_S_RUN) {
if (tdma->tdma_slot != ts->tdma_slot &&
isclr(ts->tdma_inuse, tdma->tdma_slot)) {
IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni,
"discovered in slot %u", tdma->tdma_slot);
setbit(ts->tdma_inuse, tdma->tdma_slot);
/* XXX dispatch event only when operating as master */
if (ts->tdma_slot == 0)
ieee80211_notify_node_join(ni, 1);
}
setbit(ts->tdma_active, tdma->tdma_slot);
if (tdma->tdma_slot == ts->tdma_slot-1) {
/*
* Slave tsf synchronization to station
* just before us in the schedule. The driver
* is responsible for copying the timestamp
* of the received beacon into our beacon
* frame so the sender can calculate round
* trip time. We cannot do that here because
* we don't know how to update our beacon frame.
*/
(void) tdma_update(vap, tdma, ni, 0);
/* XXX reschedule swbmiss timer on parameter change */
} else if (tdma->tdma_slot == ts->tdma_slot+1) {
uint64_t tstamp;
#if 0
uint32_t rstamp = (uint32_t) le64toh(rs->tsf);
int32_t rtt;
#endif
/*
* Use returned timstamp to calculate the
* roundtrip time.
*/
memcpy(&tstamp, tdma->tdma_tstamp, 8);
#if 0
/* XXX use only 15 bits of rstamp */
rtt = rstamp - (le64toh(tstamp) & 0x7fff);
if (rtt < 0)
rtt += 0x7fff;
/* XXX hack to quiet normal use */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X,
"tdma rtt %5u [rstamp %5u tstamp %llu]\n",
rtt, rstamp,
(unsigned long long) le64toh(tstamp));
#endif
} else if (tdma->tdma_slot == ts->tdma_slot &&
le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) {
/*
* Station using the same slot as us and has
* been around longer than us; we must move.
* Note this can happen if stations do not
* see each other while scanning.
*/
IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA,
"slot %u collision rxtsf %llu tsf %llu\n",
tdma->tdma_slot,
(unsigned long long) le64toh(ni->ni_tstamp.tsf),
vap->iv_bss->ni_tstamp.tsf);
setbit(ts->tdma_inuse, tdma->tdma_slot);
(void) tdma_update(vap, tdma, ni, 1);
}
}
return 0;
}
int
ieee80211_tdma_getslot(struct ieee80211vap *vap)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
("not a tdma vap, caps 0x%x", vap->iv_caps));
return ts->tdma_slot;
}
/*
* Parse a TDMA ie on station join and use it to setup node state.
*/
void
ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie)
{
struct ieee80211vap *vap = ni->ni_vap;
if (vap->iv_caps & IEEE80211_C_TDMA) {
const struct ieee80211_tdma_param *tdma =
(const struct ieee80211_tdma_param *)ie;
struct ieee80211_tdma_state *ts = vap->iv_tdma;
/*
* Adopt TDMA configuration when joining an
* existing network.
*/
setbit(ts->tdma_inuse, tdma->tdma_slot);
(void) tdma_update(vap, tdma, ni, 1);
/*
* Propagate capabilities based on the local
* configuration and the remote station's advertised
* capabilities. In particular this permits us to
* enable use of QoS to disable ACK's.
*/
if ((vap->iv_flags & IEEE80211_F_WME) &&
ni->ni_ies.wme_ie != NULL)
ni->ni_flags |= IEEE80211_NODE_QOS;
}
}
#define TDMA_OUI_BYTES 0x00, 0x03, 0x7f
/*
* Add a TDMA parameters element to a frame.
*/
uint8_t *
ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap)
{
#define ADDSHORT(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = (v) >> 8; \
frm += 2; \
} while (0)
static const struct ieee80211_tdma_param param = {
.tdma_id = IEEE80211_ELEMID_VENDOR,
.tdma_len = sizeof(struct ieee80211_tdma_param) - 2,
.tdma_oui = { TDMA_OUI_BYTES },
.tdma_type = TDMA_OUI_TYPE,
.tdma_subtype = TDMA_SUBTYPE_PARAM,
.tdma_version = TDMA_VERSION,
};
const struct ieee80211_tdma_state *ts = vap->iv_tdma;
uint16_t slotlen;
KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
("not a tdma vap, caps 0x%x", vap->iv_caps));
memcpy(frm, &param, sizeof(param));
frm += __offsetof(struct ieee80211_tdma_param, tdma_slot);
*frm++ = ts->tdma_slot;
*frm++ = ts->tdma_slotcnt;
/* NB: convert units to fit in 16-bits */
slotlen = ts->tdma_slotlen / 100; /* 100us units */
ADDSHORT(frm, slotlen);
*frm++ = ts->tdma_bintval;
*frm++ = ts->tdma_inuse[0];
frm += 10; /* pad+timestamp */
return frm;
#undef ADDSHORT
}
#undef TDMA_OUI_BYTES
/*
* Update TDMA state at TBTT.
*/
void
ieee80211_tdma_update_beacon(struct ieee80211vap *vap,
struct ieee80211_beacon_offsets *bo)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
KASSERT(vap->iv_caps & IEEE80211_C_TDMA,
("not a tdma vap, caps 0x%x", vap->iv_caps));
if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) {
(void) ieee80211_add_tdma(bo->bo_tdma, vap);
clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
}
if (ts->tdma_slot != 0) /* only on master */
return;
if (ts->tdma_count <= 0) {
/*
* Time to update the mask of active/inuse stations.
* We track stations that we've received a beacon
* frame from and update this mask periodically.
* This allows us to miss a few beacons before marking
* a slot free for re-use.
*/
ts->tdma_inuse[0] = ts->tdma_active[0];
ts->tdma_active[0] = 0x01;
/* update next time 'round */
/* XXX use notify framework */
setbit(bo->bo_flags, IEEE80211_BEACON_TDMA);
/* NB: use s/w beacon miss threshold; may be too high */
ts->tdma_count = vap->iv_bmissthreshold-1;
} else
ts->tdma_count--;
}
static int
tdma_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
return EOPNOTSUPP;
switch (ireq->i_type) {
case IEEE80211_IOC_TDMA_SLOT:
ireq->i_val = ts->tdma_slot;
break;
case IEEE80211_IOC_TDMA_SLOTCNT:
ireq->i_val = ts->tdma_slotcnt;
break;
case IEEE80211_IOC_TDMA_SLOTLEN:
ireq->i_val = ts->tdma_slotlen;
break;
case IEEE80211_IOC_TDMA_BINTERVAL:
ireq->i_val = ts->tdma_bintval;
break;
default:
return ENOSYS;
}
return 0;
}
IEEE80211_IOCTL_GET(tdma, tdma_ioctl_get80211);
static int
tdma_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
{
struct ieee80211_tdma_state *ts = vap->iv_tdma;
if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
return EOPNOTSUPP;
switch (ireq->i_type) {
case IEEE80211_IOC_TDMA_SLOT:
if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt))
return EINVAL;
if (ireq->i_val != ts->tdma_slot) {
ts->tdma_slot = ireq->i_val;
goto restart;
}
break;
case IEEE80211_IOC_TDMA_SLOTCNT:
if (!TDMA_SLOTCNT_VALID(ireq->i_val))
return EINVAL;
if (ireq->i_val != ts->tdma_slotcnt) {
ts->tdma_slotcnt = ireq->i_val;
goto restart;
}
break;
case IEEE80211_IOC_TDMA_SLOTLEN:
/*
* XXX
* 150 insures at least 1/8 TU
* 0xfffff is the max duration for bursting
* (implict by way of 16-bit data type for i_val)
*/
if (!TDMA_SLOTLEN_VALID(ireq->i_val))
return EINVAL;
if (ireq->i_val != ts->tdma_slotlen) {
ts->tdma_slotlen = ireq->i_val;
goto restart;
}
break;
case IEEE80211_IOC_TDMA_BINTERVAL:
if (!TDMA_BINTVAL_VALID(ireq->i_val))
return EINVAL;
if (ireq->i_val != ts->tdma_bintval) {
ts->tdma_bintval = ireq->i_val;
goto restart;
}
break;
default:
return ENOSYS;
}
return 0;
restart:
ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA);
return ERESTART;
}
IEEE80211_IOCTL_SET(tdma, tdma_ioctl_set80211);
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