blob: e387f0b2954a0cf5500610b330f744a5b68cd69c [file] [log] [blame]
/*
* Copyright (c) 2008-2011 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or 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 <linux/dma-mapping.h>
#include "ath9k.h"
#define FUDGE 2
static void ath9k_reset_beacon_status(struct ath_softc *sc)
{
sc->beacon.tx_processed = false;
sc->beacon.tx_last = false;
}
/*
* This function will modify certain transmit queue properties depending on
* the operating mode of the station (AP or AdHoc). Parameters are AIFS
* settings and channel width min/max
*/
static void ath9k_beaconq_config(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath9k_tx_queue_info qi, qi_be;
struct ath_txq *txq;
ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
/* Always burst out beacon and CAB traffic. */
qi.tqi_aifs = 1;
qi.tqi_cwmin = 0;
qi.tqi_cwmax = 0;
} else {
/* Adhoc mode; important thing is to use 2x cwmin. */
txq = sc->tx.txq_map[IEEE80211_AC_BE];
ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
qi.tqi_aifs = qi_be.tqi_aifs;
if (ah->slottime == ATH9K_SLOT_TIME_20)
qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
else
qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
qi.tqi_cwmax = qi_be.tqi_cwmax;
}
if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
ath_err(common, "Unable to update h/w beacon queue parameters\n");
} else {
ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
}
}
/*
* Associates the beacon frame buffer with a transmit descriptor. Will set
* up rate codes, and channel flags. Beacons are always sent out at the
* lowest rate, and are not retried.
*/
static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
struct ath_buf *bf, int rateidx)
{
struct sk_buff *skb = bf->bf_mpdu;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath_tx_info info;
struct ieee80211_supported_band *sband;
u8 chainmask = ah->txchainmask;
u8 rate = 0;
sband = &common->sbands[common->hw->conf.chandef.chan->band];
rate = sband->bitrates[rateidx].hw_value;
if (vif->bss_conf.use_short_preamble)
rate |= sband->bitrates[rateidx].hw_value_short;
memset(&info, 0, sizeof(info));
info.pkt_len = skb->len + FCS_LEN;
info.type = ATH9K_PKT_TYPE_BEACON;
info.txpower = MAX_RATE_POWER;
info.keyix = ATH9K_TXKEYIX_INVALID;
info.keytype = ATH9K_KEY_TYPE_CLEAR;
info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
info.buf_addr[0] = bf->bf_buf_addr;
info.buf_len[0] = roundup(skb->len, 4);
info.is_first = true;
info.is_last = true;
info.qcu = sc->beacon.beaconq;
info.rates[0].Tries = 1;
info.rates[0].Rate = rate;
info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
}
static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct ath_softc *sc = hw->priv;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_buf *bf;
struct ath_vif *avp = (void *)vif->drv_priv;
struct sk_buff *skb;
struct ath_txq *cabq = sc->beacon.cabq;
struct ieee80211_tx_info *info;
struct ieee80211_mgmt *mgmt_hdr;
int cabq_depth;
if (avp->av_bcbuf == NULL)
return NULL;
bf = avp->av_bcbuf;
skb = bf->bf_mpdu;
if (skb) {
dma_unmap_single(sc->dev, bf->bf_buf_addr,
skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
bf->bf_buf_addr = 0;
bf->bf_mpdu = NULL;
}
skb = ieee80211_beacon_get(hw, vif);
if (skb == NULL)
return NULL;
bf->bf_mpdu = skb;
mgmt_hdr = (struct ieee80211_mgmt *)skb->data;
mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust;
info = IEEE80211_SKB_CB(skb);
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
/*
* TODO: make sure the seq# gets assigned properly (vs. other
* TX frames)
*/
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
sc->tx.seq_no += 0x10;
hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
}
bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
skb->len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
dev_kfree_skb_any(skb);
bf->bf_mpdu = NULL;
bf->bf_buf_addr = 0;
ath_err(common, "dma_mapping_error on beaconing\n");
return NULL;
}
skb = ieee80211_get_buffered_bc(hw, vif);
/*
* if the CABQ traffic from previous DTIM is pending and the current
* beacon is also a DTIM.
* 1) if there is only one vif let the cab traffic continue.
* 2) if there are more than one vif and we are using staggered
* beacons, then drain the cabq by dropping all the frames in
* the cabq so that the current vifs cab traffic can be scheduled.
*/
spin_lock_bh(&cabq->axq_lock);
cabq_depth = cabq->axq_depth;
spin_unlock_bh(&cabq->axq_lock);
if (skb && cabq_depth) {
if (sc->nvifs > 1) {
ath_dbg(common, BEACON,
"Flushing previous cabq traffic\n");
ath_draintxq(sc, cabq);
}
}
ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
if (skb)
ath_tx_cabq(hw, vif, skb);
return bf;
}
void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_vif *avp = (void *)vif->drv_priv;
int slot;
avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
list_del(&avp->av_bcbuf->list);
for (slot = 0; slot < ATH_BCBUF; slot++) {
if (sc->beacon.bslot[slot] == NULL) {
avp->av_bslot = slot;
break;
}
}
sc->beacon.bslot[avp->av_bslot] = vif;
sc->nbcnvifs++;
ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
avp->av_bslot);
}
void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_vif *avp = (void *)vif->drv_priv;
struct ath_buf *bf = avp->av_bcbuf;
ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
avp->av_bslot);
tasklet_disable(&sc->bcon_tasklet);
if (bf && bf->bf_mpdu) {
struct sk_buff *skb = bf->bf_mpdu;
dma_unmap_single(sc->dev, bf->bf_buf_addr,
skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
bf->bf_mpdu = NULL;
bf->bf_buf_addr = 0;
}
avp->av_bcbuf = NULL;
sc->beacon.bslot[avp->av_bslot] = NULL;
sc->nbcnvifs--;
list_add_tail(&bf->list, &sc->beacon.bbuf);
tasklet_enable(&sc->bcon_tasklet);
}
static int ath9k_beacon_choose_slot(struct ath_softc *sc)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
u16 intval;
u32 tsftu;
u64 tsf;
int slot;
if (sc->sc_ah->opmode != NL80211_IFTYPE_AP &&
sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) {
ath_dbg(common, BEACON, "slot 0, tsf: %llu\n",
ath9k_hw_gettsf64(sc->sc_ah));
return 0;
}
intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
tsf = ath9k_hw_gettsf64(sc->sc_ah);
tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time);
tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
slot = (tsftu % (intval * ATH_BCBUF)) / intval;
ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n",
slot, tsf, tsftu / ATH_BCBUF);
return slot;
}
static void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
struct ath_vif *avp = (void *)vif->drv_priv;
u32 tsfadjust;
if (avp->av_bslot == 0)
return;
tsfadjust = cur_conf->beacon_interval * avp->av_bslot;
tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF;
avp->tsf_adjust = cpu_to_le64(tsfadjust);
ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
(unsigned long long)tsfadjust, avp->av_bslot);
}
bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif)
{
if (!vif || !vif->csa_active)
return false;
if (!ieee80211_csa_is_complete(vif))
return false;
ieee80211_csa_finish(vif);
return true;
}
static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif)
{
struct ath_softc *sc = data;
ath9k_csa_is_finished(sc, vif);
}
void ath9k_csa_update(struct ath_softc *sc)
{
ieee80211_iterate_active_interfaces_atomic(sc->hw,
IEEE80211_IFACE_ITER_NORMAL,
ath9k_csa_update_vif, sc);
}
void ath9k_beacon_tasklet(unsigned long data)
{
struct ath_softc *sc = (struct ath_softc *)data;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath_buf *bf = NULL;
struct ieee80211_vif *vif;
bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
int slot;
if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) {
ath_dbg(common, RESET,
"reset work is pending, skip beaconing now\n");
return;
}
/*
* Check if the previous beacon has gone out. If
* not don't try to post another, skip this period
* and wait for the next. Missed beacons indicate
* a problem and should not occur. If we miss too
* many consecutive beacons reset the device.
*/
if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
sc->beacon.bmisscnt++;
ath9k_hw_check_nav(ah);
/*
* If the previous beacon has not been transmitted
* and a MAC/BB hang has been identified, return
* here because a chip reset would have been
* initiated.
*/
if (!ath_hw_check(sc))
return;
if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
ath_dbg(common, BSTUCK,
"missed %u consecutive beacons\n",
sc->beacon.bmisscnt);
ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
if (sc->beacon.bmisscnt > 3)
ath9k_hw_bstuck_nfcal(ah);
} else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
sc->beacon.bmisscnt = 0;
ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
}
return;
}
slot = ath9k_beacon_choose_slot(sc);
vif = sc->beacon.bslot[slot];
/* EDMA devices check that in the tx completion function. */
if (!edma && ath9k_csa_is_finished(sc, vif))
return;
if (!vif || !vif->bss_conf.enable_beacon)
return;
bf = ath9k_beacon_generate(sc->hw, vif);
if (sc->beacon.bmisscnt != 0) {
ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
sc->beacon.bmisscnt);
sc->beacon.bmisscnt = 0;
}
/*
* Handle slot time change when a non-ERP station joins/leaves
* an 11g network. The 802.11 layer notifies us via callback,
* we mark updateslot, then wait one beacon before effecting
* the change. This gives associated stations at least one
* beacon interval to note the state change.
*
* NB: The slot time change state machine is clocked according
* to whether we are bursting or staggering beacons. We
* recognize the request to update and record the current
* slot then don't transition until that slot is reached
* again. If we miss a beacon for that slot then we'll be
* slow to transition but we'll be sure at least one beacon
* interval has passed. When bursting slot is always left
* set to ATH_BCBUF so this check is a noop.
*/
if (sc->beacon.updateslot == UPDATE) {
sc->beacon.updateslot = COMMIT;
sc->beacon.slotupdate = slot;
} else if (sc->beacon.updateslot == COMMIT &&
sc->beacon.slotupdate == slot) {
ah->slottime = sc->beacon.slottime;
ath9k_hw_init_global_settings(ah);
sc->beacon.updateslot = OK;
}
if (bf) {
ath9k_reset_beacon_status(sc);
ath_dbg(common, BEACON,
"Transmitting beacon for slot: %d\n", slot);
/* NB: cabq traffic should already be queued and primed */
ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
if (!edma)
ath9k_hw_txstart(ah, sc->beacon.beaconq);
}
}
/*
* Both nexttbtt and intval have to be in usecs.
*/
static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
u32 intval, bool reset_tsf)
{
struct ath_hw *ah = sc->sc_ah;
ath9k_hw_disable_interrupts(ah);
if (reset_tsf)
ath9k_hw_reset_tsf(ah);
ath9k_beaconq_config(sc);
ath9k_hw_beaconinit(ah, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
ath9k_hw_set_interrupts(ah);
ath9k_hw_enable_interrupts(ah);
}
/*
* For multi-bss ap support beacons are either staggered evenly over N slots or
* burst together. For the former arrange for the SWBA to be delivered for each
* slot. Slots that are not occupied will generate nothing.
*/
static void ath9k_beacon_config_ap(struct ath_softc *sc,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = sc->sc_ah;
ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF);
ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false);
}
static void ath9k_beacon_config_sta(struct ath_hw *ah,
struct ath_beacon_config *conf)
{
struct ath9k_beacon_state bs;
if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM)
return;
ath9k_hw_disable_interrupts(ah);
ath9k_hw_set_sta_beacon_timers(ah, &bs);
ah->imask |= ATH9K_INT_BMISS;
ath9k_hw_set_interrupts(ah);
ath9k_hw_enable_interrupts(ah);
}
static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
ath9k_reset_beacon_status(sc);
ath9k_cmn_beacon_config_adhoc(ah, conf);
ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator);
/*
* Set the global 'beacon has been configured' flag for the
* joiner case in IBSS mode.
*/
if (!conf->ibss_creator && conf->enable_beacon)
set_bit(ATH_OP_BEACONS, &common->op_flags);
}
static bool ath9k_allow_beacon_config(struct ath_softc *sc,
struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_vif *avp = (void *)vif->drv_priv;
if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
if ((vif->type != NL80211_IFTYPE_AP) ||
(sc->nbcnvifs > 1)) {
ath_dbg(common, CONFIG,
"An AP interface is already present !\n");
return false;
}
}
if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
if ((vif->type == NL80211_IFTYPE_STATION) &&
test_bit(ATH_OP_BEACONS, &common->op_flags) &&
!avp->primary_sta_vif) {
ath_dbg(common, CONFIG,
"Beacon already configured for a station interface\n");
return false;
}
}
return true;
}
static void ath9k_cache_beacon_config(struct ath_softc *sc,
struct ieee80211_bss_conf *bss_conf)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
ath_dbg(common, BEACON,
"Caching beacon data for BSS: %pM\n", bss_conf->bssid);
cur_conf->beacon_interval = bss_conf->beacon_int;
cur_conf->dtim_period = bss_conf->dtim_period;
cur_conf->dtim_count = 1;
cur_conf->ibss_creator = bss_conf->ibss_creator;
/*
* It looks like mac80211 may end up using beacon interval of zero in
* some cases (at least for mesh point). Avoid getting into an
* infinite loop by using a bit safer value instead. To be safe,
* do sanity check on beacon interval for all operating modes.
*/
if (cur_conf->beacon_interval == 0)
cur_conf->beacon_interval = 100;
cur_conf->bmiss_timeout =
ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
/*
* We don't parse dtim period from mac80211 during the driver
* initialization as it breaks association with hidden-ssid
* AP and it causes latency in roaming
*/
if (cur_conf->dtim_period == 0)
cur_conf->dtim_period = 1;
}
void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
u32 changed)
{
struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
unsigned long flags;
bool skip_beacon = false;
if (vif->type == NL80211_IFTYPE_AP)
ath9k_set_tsfadjust(sc, vif);
if (!ath9k_allow_beacon_config(sc, vif))
return;
if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
ath9k_cache_beacon_config(sc, bss_conf);
ath9k_set_beacon(sc);
set_bit(ATH_OP_BEACONS, &common->op_flags);
return;
}
/*
* Take care of multiple interfaces when
* enabling/disabling SWBA.
*/
if (changed & BSS_CHANGED_BEACON_ENABLED) {
if (!bss_conf->enable_beacon &&
(sc->nbcnvifs <= 1)) {
cur_conf->enable_beacon = false;
} else if (bss_conf->enable_beacon) {
cur_conf->enable_beacon = true;
ath9k_cache_beacon_config(sc, bss_conf);
}
}
/*
* Configure the HW beacon registers only when we have a valid
* beacon interval.
*/
if (cur_conf->beacon_interval) {
/*
* If we are joining an existing IBSS network, start beaconing
* only after a TSF-sync has taken place. Ensure that this
* happens by setting the appropriate flags.
*/
if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
bss_conf->enable_beacon) {
spin_lock_irqsave(&sc->sc_pm_lock, flags);
sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
skip_beacon = true;
} else {
ath9k_set_beacon(sc);
}
/*
* Do not set the ATH_OP_BEACONS flag for IBSS joiner mode
* here, it is done in ath9k_beacon_config_adhoc().
*/
if (cur_conf->enable_beacon && !skip_beacon)
set_bit(ATH_OP_BEACONS, &common->op_flags);
else
clear_bit(ATH_OP_BEACONS, &common->op_flags);
}
}
void ath9k_set_beacon(struct ath_softc *sc)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
switch (sc->sc_ah->opmode) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_MESH_POINT:
ath9k_beacon_config_ap(sc, cur_conf);
break;
case NL80211_IFTYPE_ADHOC:
ath9k_beacon_config_adhoc(sc, cur_conf);
break;
case NL80211_IFTYPE_STATION:
ath9k_beacon_config_sta(sc->sc_ah, cur_conf);
break;
default:
ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
return;
}
}