- 根目录:
- drivers
- net
- wireless
- ath
- ath9k
- htc_drv_beacon.c
/*
* Copyright (c) 2010-2011 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 "htc.h"
#define FUDGE 2
void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
{
struct ath_hw *ah = priv->ah;
struct ath9k_tx_queue_info qi, qi_be;
memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));
ath9k_hw_get_txq_props(ah, priv->beacon.beaconq, &qi);
if (priv->ah->opmode == NL80211_IFTYPE_AP ||
priv->ah->opmode == NL80211_IFTYPE_MESH_POINT) {
qi.tqi_aifs = 1;
qi.tqi_cwmin = 0;
qi.tqi_cwmax = 0;
} else if (priv->ah->opmode == NL80211_IFTYPE_ADHOC) {
int qnum = priv->hwq_map[IEEE80211_AC_BE];
ath9k_hw_get_txq_props(ah, qnum, &qi_be);
qi.tqi_aifs = qi_be.tqi_aifs;
/*
* For WIFI Beacon Distribution
* Long slot time : 2x cwmin
* Short slot time : 4x cwmin
*/
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, priv->beacon.beaconq, &qi)) {
ath_err(ath9k_hw_common(ah),
"Unable to update beacon queue %u!\n", priv->beacon.beaconq);
} else {
ath9k_hw_resettxqueue(ah, priv->beacon.beaconq);
}
}
/*
* Both nexttbtt and intval have to be in usecs.
*/
static void ath9k_htc_beacon_init(struct ath9k_htc_priv *priv,
struct ath_beacon_config *conf,
bool reset_tsf)
{
struct ath_hw *ah = priv->ah;
int ret __attribute__ ((unused));
__be32 htc_imask = 0;
u8 cmd_rsp;
if (conf->intval >= TU_TO_USEC(DEFAULT_SWBA_RESPONSE))
ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
else
ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
WMI_CMD(WMI_DISABLE_INTR_CMDID);
if (reset_tsf)
ath9k_hw_reset_tsf(ah);
ath9k_htc_beaconq_config(priv);
ath9k_hw_beaconinit(ah, conf->nexttbtt, conf->intval);
priv->beacon.bmisscnt = 0;
htc_imask = cpu_to_be32(ah->imask);
WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
}
static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
struct ath_beacon_config *bss_conf)
{
struct ath9k_beacon_state bs;
enum ath9k_int imask = 0;
__be32 htc_imask = 0;
int ret __attribute__ ((unused));
u8 cmd_rsp;
if (ath9k_cmn_beacon_config_sta(priv->ah, bss_conf, &bs) == -EPERM)
return;
WMI_CMD(WMI_DISABLE_INTR_CMDID);
ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
imask |= ATH9K_INT_BMISS;
htc_imask = cpu_to_be32(imask);
WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
}
static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = priv->ah;
ah->imask = 0;
ath9k_cmn_beacon_config_ap(ah, conf, ATH9K_HTC_MAX_BCN_VIF);
ath9k_htc_beacon_init(priv, conf, false);
}
static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = priv->ah;
ah->imask = 0;
ath9k_cmn_beacon_config_adhoc(ah, conf);
ath9k_htc_beacon_init(priv, conf, conf->ibss_creator);
}
void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,
enum htc_endpoint_id ep_id, bool txok)
{
dev_kfree_skb_any(skb);
}
static void ath9k_htc_send_buffered(struct ath9k_htc_priv *priv,
int slot)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ieee80211_vif *vif;
struct sk_buff *skb;
struct ieee80211_hdr *hdr;
int padpos, padsize, ret, tx_slot;
spin_lock_bh(&priv->beacon_lock);
vif = priv->beacon.bslot[slot];
skb = ieee80211_get_buffered_bc(priv->hw, vif);
while(skb) {
hdr = (struct ieee80211_hdr *) skb->data;
padpos = ieee80211_hdrlen(hdr->frame_control);
padsize = padpos & 3;
if (padsize && skb->len > padpos) {
if (skb_headroom(skb) < padsize) {
dev_kfree_skb_any(skb);
goto next;
}
skb_push(skb, padsize);
memmove(skb->data, skb->data + padsize, padpos);
}
tx_slot = ath9k_htc_tx_get_slot(priv);
if (tx_slot < 0) {
ath_dbg(common, XMIT, "No free CAB slot\n");
dev_kfree_skb_any(skb);
goto next;
}
ret = ath9k_htc_tx_start(priv, NULL, skb, tx_slot, true);
if (ret != 0) {
ath9k_htc_tx_clear_slot(priv, tx_slot);
dev_kfree_skb_any(skb);
ath_dbg(common, XMIT, "Failed to send CAB frame\n");
} else {
spin_lock_bh(&priv->tx.tx_lock);
priv->tx.queued_cnt++;
spin_unlock_bh(&priv->tx.tx_lock);
}
next:
skb = ieee80211_get_buffered_bc(priv->hw, vif);
}
spin_unlock_bh(&priv->beacon_lock);
}
static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,
int slot)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ieee80211_vif *vif;
struct ath9k_htc_vif *avp;
struct tx_beacon_header beacon_hdr;
struct ath9k_htc_tx_ctl *tx_ctl;
struct ieee80211_tx_info *info;
struct ieee80211_mgmt *mgmt;
struct sk_buff *beacon;
u8 *tx_fhdr;
int ret;
memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
spin_lock_bh(&priv->beacon_lock);
vif = priv->beacon.bslot[slot];
avp = (struct ath9k_htc_vif *)vif->drv_priv;
if (unlikely(test_bit(ATH_OP_SCANNING, &common->op_flags))) {
spin_unlock_bh(&priv->beacon_lock);
return;
}
/* Get a new beacon */
beacon = ieee80211_beacon_get(priv->hw, vif);
if (!beacon) {
spin_unlock_bh(&priv->beacon_lock);
return;
}
/*
* Update the TSF adjust value here, the HW will
* add this value for every beacon.
*/
mgmt = (struct ieee80211_mgmt *)beacon->data;
mgmt->u.beacon.timestamp = avp->tsfadjust;
info = IEEE80211_SKB_CB(beacon);
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
struct ieee80211_hdr *hdr =
(struct ieee80211_hdr *) beacon->data;
avp->seq_no += 0x10;
hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
}
tx_ctl = HTC_SKB_CB(beacon);
memset(tx_ctl, 0, sizeof(*tx_ctl));
tx_ctl->type = ATH9K_HTC_BEACON;
tx_ctl->epid = priv->beacon_ep;
beacon_hdr.vif_index = avp->index;
tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
ret = htc_send(priv->htc, beacon);
if (ret != 0) {
if (ret == -ENOMEM) {
ath_dbg(common, BSTUCK,
"Failed to send beacon, no free TX buffer\n");
}
dev_kfree_skb_any(beacon);
}
spin_unlock_bh(&priv->beacon_lock);
ath9k_htc_csa_is_finished(priv);
}
static int ath9k_htc_choose_bslot(struct ath9k_htc_priv *priv,
struct wmi_event_swba *swba)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
u64 tsf;
u32 tsftu;
u16 intval;
int slot;
intval = priv->cur_beacon_conf.beacon_interval;
tsf = be64_to_cpu(swba->tsf);
tsftu = TSF_TO_TU(tsf >> 32, tsf);
slot = ((tsftu % intval) * ATH9K_HTC_MAX_BCN_VIF) / intval;
slot = ATH9K_HTC_MAX_BCN_VIF - slot - 1;
ath_dbg(common, BEACON,
"Choose slot: %d, tsf: %llu, tsftu: %u, intval: %u\n",
slot, tsf, tsftu, intval);
return slot;
}
void ath9k_htc_swba(struct ath9k_htc_priv *priv,
struct wmi_event_swba *swba)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
int slot;
if (swba->beacon_pending != 0) {
priv->beacon.bmisscnt++;
if (priv->beacon.bmisscnt > BSTUCK_THRESHOLD) {
ath_dbg(common, BSTUCK, "Beacon stuck, HW reset\n");
ieee80211_queue_work(priv->hw,
&priv->fatal_work);
}
return;
}
if (priv->beacon.bmisscnt) {
ath_dbg(common, BSTUCK,
"Resuming beacon xmit after %u misses\n",
priv->beacon.bmisscnt);
priv->beacon.bmisscnt = 0;
}
slot = ath9k_htc_choose_bslot(priv, swba);
spin_lock_bh(&priv->beacon_lock);
if (priv->beacon.bslot[slot] == NULL) {
spin_unlock_bh(&priv->beacon_lock);
return;
}
spin_unlock_bh(&priv->beacon_lock);
ath9k_htc_send_buffered(priv, slot);
ath9k_htc_send_beacon(priv, slot);
}
void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,
struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
int i = 0;
spin_lock_bh(&priv->beacon_lock);
for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {
if (priv->beacon.bslot[i] == NULL) {
avp->bslot = i;
break;
}
}
priv->beacon.bslot[avp->bslot] = vif;
spin_unlock_bh(&priv->beacon_lock);
ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
avp->bslot);
}
void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,
struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
spin_lock_bh(&priv->beacon_lock);
priv->beacon.bslot[avp->bslot] = NULL;
spin_unlock_bh(&priv->beacon_lock);
ath_dbg(common, CONFIG, "Removed interface at beacon slot: %d\n",
avp->bslot);
}
/*
* Calculate the TSF adjustment value for all slots
* other than zero.
*/
void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,
struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
u64 tsfadjust;
if (avp->bslot == 0)
return;
/*
* The beacon interval cannot be different for multi-AP mode,
* and we reach here only for VIF slots greater than zero,
* so beacon_interval is guaranteed to be set in cur_conf.
*/
tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;
avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
(unsigned long long)tsfadjust, avp->bslot);
}
static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
{
bool *beacon_configured = (bool *)data;
struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
if (vif->type == NL80211_IFTYPE_STATION &&
avp->beacon_configured)
*beacon_configured = true;
}
static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
bool beacon_configured;
/*
* Changing the beacon interval when multiple AP interfaces
* are configured will affect beacon transmission of all
* of them.
*/
if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
(priv->num_ap_vif > 1) &&
(vif->type == NL80211_IFTYPE_AP) &&
(cur_conf->beacon_interval != bss_conf->beacon_int)) {
ath_dbg(common, CONFIG,
"Changing beacon interval of multiple AP interfaces !\n");
return false;
}
/*
* If the HW is operating in AP mode, any new station interfaces that
* are added cannot change the beacon parameters.
*/
if (priv->num_ap_vif &&
(vif->type != NL80211_IFTYPE_AP)) {
ath_dbg(common, CONFIG,
"HW in AP mode, cannot set STA beacon parameters\n");
return false;
}
/*
* The beacon parameters are configured only for the first
* station interface.
*/
if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
(priv->num_sta_vif > 1) &&
(vif->type == NL80211_IFTYPE_STATION)) {
beacon_configured = false;
ieee80211_iterate_active_interfaces_atomic(
priv->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
ath9k_htc_beacon_iter, &beacon_configured);
if (beacon_configured) {
ath_dbg(common, CONFIG,
"Beacon already configured for a station interface\n");
return false;
}
}
return true;
}
void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
if (!ath9k_htc_check_beacon_config(priv, vif))
return;
cur_conf->beacon_interval = bss_conf->beacon_int;
if (cur_conf->beacon_interval == 0)
cur_conf->beacon_interval = 100;
cur_conf->dtim_period = bss_conf->dtim_period;
cur_conf->bmiss_timeout =
ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
switch (vif->type) {
case NL80211_IFTYPE_STATION:
ath9k_htc_beacon_config_sta(priv, cur_conf);
avp->beacon_configured = true;
break;
case NL80211_IFTYPE_ADHOC:
ath9k_htc_beacon_config_adhoc(priv, cur_conf);
break;
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_AP:
ath9k_htc_beacon_config_ap(priv, cur_conf);
break;
default:
ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
return;
}
}
void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
{
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
switch (priv->ah->opmode) {
case NL80211_IFTYPE_STATION:
ath9k_htc_beacon_config_sta(priv, cur_conf);
break;
case NL80211_IFTYPE_ADHOC:
ath9k_htc_beacon_config_adhoc(priv, cur_conf);
break;
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_AP:
ath9k_htc_beacon_config_ap(priv, cur_conf);
break;
default:
ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
return;
}
}
bool ath9k_htc_csa_is_finished(struct ath9k_htc_priv *priv)
{
struct ieee80211_vif *vif;
vif = priv->csa_vif;
if (!vif || !vif->csa_active)
return false;
if (!ieee80211_csa_is_complete(vif))
return false;
ieee80211_csa_finish(vif);
priv->csa_vif = NULL;
return true;
}