freebsd-dev/sys/dev/rtwn/if_rtwn_beacon.c
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267 lines
6.3 KiB
C

/*-
* Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
* Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org>
* Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/taskqueue.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <net/if.h>
#include <net/ethernet.h>
#include <net/if_media.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_radiotap.h>
#include <dev/rtwn/if_rtwnvar.h>
#include <dev/rtwn/if_rtwn_beacon.h>
#include <dev/rtwn/if_rtwn_debug.h>
#include <dev/rtwn/if_rtwn_tx.h>
#include <dev/rtwn/rtl8192c/r92c_reg.h>
static void
rtwn_reset_beacon_valid(struct rtwn_softc *sc, int id)
{
KASSERT (id == 0 || id == 1, ("wrong port id %d\n", id));
/* XXX cannot be cleared on RTL8188CE */
rtwn_setbits_1_shift(sc, sc->bcn_status_reg[id],
R92C_TDECTRL_BCN_VALID, 0, 2);
RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
"%s: 'beacon valid' bit for vap %d was unset\n",
__func__, id);
}
static int
rtwn_check_beacon_valid(struct rtwn_softc *sc, int id)
{
uint16_t reg;
int ntries;
if (id == RTWN_VAP_ID_INVALID)
return (0);
reg = sc->bcn_status_reg[id];
for (ntries = 0; ntries < 10; ntries++) {
if (rtwn_read_4(sc, reg) & R92C_TDECTRL_BCN_VALID) {
RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
"%s: beacon for vap %d was recognized\n",
__func__, id);
break;
}
rtwn_delay(sc, sc->bcn_check_interval);
}
if (ntries == 10)
return (ETIMEDOUT);
return (0);
}
void
rtwn_switch_bcnq(struct rtwn_softc *sc, int id)
{
if (sc->cur_bcnq_id != id) {
/* Wait until any previous transmit completes. */
(void) rtwn_check_beacon_valid(sc, sc->cur_bcnq_id);
/* Change current port. */
rtwn_beacon_select(sc, id);
sc->cur_bcnq_id = id;
}
/* Reset 'beacon valid' bit. */
rtwn_reset_beacon_valid(sc, id);
}
int
rtwn_setup_beacon(struct rtwn_softc *sc, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct rtwn_vap *uvp = RTWN_VAP(vap);
struct mbuf *m;
RTWN_ASSERT_LOCKED(sc);
if (ni->ni_chan == IEEE80211_CHAN_ANYC)
return (EINVAL);
m = ieee80211_beacon_alloc(ni);
if (m == NULL) {
device_printf(sc->sc_dev,
"%s: could not allocate beacon frame\n", __func__);
return (ENOMEM);
}
if (uvp->bcn_mbuf != NULL) {
rtwn_beacon_unload(sc, uvp->id);
m_freem(uvp->bcn_mbuf);
}
uvp->bcn_mbuf = m;
rtwn_beacon_set_rate(sc, &uvp->bcn_desc.txd[0],
IEEE80211_IS_CHAN_5GHZ(ni->ni_chan));
return (rtwn_tx_beacon_check(sc, uvp));
}
/*
* Push a beacon frame into the chip. Beacon will
* be repeated by the chip every R92C_BCN_INTERVAL.
*/
static int
rtwn_tx_beacon(struct rtwn_softc *sc, struct rtwn_vap *uvp)
{
int error;
RTWN_ASSERT_LOCKED(sc);
RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
"%s: sending beacon for vap %d\n", __func__, uvp->id);
error = rtwn_tx_start(sc, NULL, uvp->bcn_mbuf, &uvp->bcn_desc.txd[0],
IEEE80211_FC0_TYPE_MGT, uvp->id);
return (error);
}
void
rtwn_update_beacon(struct ieee80211vap *vap, int item)
{
struct ieee80211com *ic = vap->iv_ic;
struct rtwn_softc *sc = ic->ic_softc;
struct rtwn_vap *uvp = RTWN_VAP(vap);
struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
struct ieee80211_node *ni = vap->iv_bss;
int mcast = 0;
RTWN_LOCK(sc);
if (uvp->bcn_mbuf == NULL) {
uvp->bcn_mbuf = ieee80211_beacon_alloc(ni);
if (uvp->bcn_mbuf == NULL) {
device_printf(sc->sc_dev,
"%s: could not allocate beacon frame\n", __func__);
RTWN_UNLOCK(sc);
return;
}
}
RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
"%s: vap id %d, iv_csa_count %d, ic_csa_count %d, item %d\n",
__func__, uvp->id, vap->iv_csa_count, ic->ic_csa_count, item);
switch (item) {
case IEEE80211_BEACON_CSA:
if (vap->iv_csa_count != ic->ic_csa_count) {
/*
* XXX two APs with different beacon intervals
* are not handled properly.
*/
/* XXX check TBTT? */
taskqueue_enqueue_timeout(taskqueue_thread,
&uvp->tx_beacon_csa,
msecs_to_ticks(ni->ni_intval));
}
break;
case IEEE80211_BEACON_TIM:
mcast = 1; /* XXX */
break;
default:
break;
}
setbit(bo->bo_flags, item);
rtwn_beacon_update_begin(sc, vap);
RTWN_UNLOCK(sc);
ieee80211_beacon_update(ni, uvp->bcn_mbuf, mcast);
/* XXX clear manually */
clrbit(bo->bo_flags, IEEE80211_BEACON_CSA);
RTWN_LOCK(sc);
rtwn_tx_beacon(sc, uvp);
rtwn_beacon_update_end(sc, vap);
RTWN_UNLOCK(sc);
}
void
rtwn_tx_beacon_csa(void *arg, int npending __unused)
{
struct ieee80211vap *vap = arg;
struct ieee80211com *ic = vap->iv_ic;
struct rtwn_softc *sc = ic->ic_softc;
struct rtwn_vap *rvp = RTWN_VAP(vap);
KASSERT (rvp->id == 0 || rvp->id == 1,
("wrong port id %d\n", rvp->id));
IEEE80211_LOCK(ic);
if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
RTWN_DPRINTF(sc, RTWN_DEBUG_BEACON,
"%s: vap id %d, iv_csa_count %d, ic_csa_count %d\n",
__func__, rvp->id, vap->iv_csa_count, ic->ic_csa_count);
rtwn_update_beacon(vap, IEEE80211_BEACON_CSA);
}
IEEE80211_UNLOCK(ic);
(void) rvp;
}
int
rtwn_tx_beacon_check(struct rtwn_softc *sc, struct rtwn_vap *uvp)
{
int ntries, error;
for (ntries = 0; ntries < 5; ntries++) {
rtwn_reset_beacon_valid(sc, uvp->id);
error = rtwn_tx_beacon(sc, uvp);
if (error != 0)
continue;
error = rtwn_check_beacon_valid(sc, uvp->id);
if (error == 0)
break;
}
if (ntries == 5) {
device_printf(sc->sc_dev,
"%s: cannot push beacon into chip, error %d!\n",
__func__, error);
return (error);
}
return (0);
}