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ath9k_htc: Fix beacon miss under heavy load 

Transmission of beacons becomes erratic when TX load
is high, since the latency involved in the generation
of a SWBA interrupt on the target to the actual sending
of a beacon is quite high for USB devices.

Fix this by adjusting the beacon response time.

Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
hifive-unleashed-5.1
Sujith Manoharan 2011-04-13 11:23:44 +05:30 committed by John W. Linville
parent 7d547eb4bb
commit b0a6ba983e
2 changed files with 41 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/wireless/ath/ath9k/htc.h
View File

@ -358,6 +358,13 @@ struct ath_led {
#define BSTUCK_THRESHOLD 10
/*
* Adjust these when the max. no of beaconing interfaces is
* increased.
*/
#define DEFAULT_SWBA_RESPONSE 40 /* in TUs */
#define MIN_SWBA_RESPONSE 10 /* in TUs */
struct htc_beacon_config {
struct ieee80211_vif *bslot[ATH9K_HTC_MAX_BCN_VIF];
u16 beacon_interval;

39
drivers/net/wireless/ath/ath9k/htc_drv_beacon.c
View File

@ -198,6 +198,15 @@ static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
intval /= ATH9K_HTC_MAX_BCN_VIF;
nexttbtt = intval;
/*
* To reduce beacon misses under heavy TX load,
* set the beacon response time to a larger value.
*/
if (intval > DEFAULT_SWBA_RESPONSE)
priv->ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
else
priv->ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
if (priv->op_flags & OP_TSF_RESET) {
ath9k_hw_reset_tsf(priv->ah);
priv->op_flags &= ~OP_TSF_RESET;
@ -216,9 +225,10 @@ static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
imask |= ATH9K_INT_SWBA;
ath_dbg(common, ATH_DBG_CONFIG,
"AP Beacon config, intval: %d, nexttbtt: %u "
"AP Beacon config, intval: %d, nexttbtt: %u, resp_time: %d "
"imask: 0x%x\n",
bss_conf->beacon_interval, nexttbtt, imask);
bss_conf->beacon_interval, nexttbtt,
priv->ah->config.sw_beacon_response_time, imask);
ath9k_htc_beaconq_config(priv);
@ -252,12 +262,22 @@ static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
nexttbtt += intval;
} while (nexttbtt < tsftu);
/*
* Only one IBSS interfce is allowed.
*/
if (intval > DEFAULT_SWBA_RESPONSE)
priv->ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
else
priv->ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
if (priv->op_flags & OP_ENABLE_BEACON)
imask |= ATH9K_INT_SWBA;
ath_dbg(common, ATH_DBG_CONFIG,
"IBSS Beacon config, intval: %d, nexttbtt: %u, imask: 0x%x\n",
bss_conf->beacon_interval, nexttbtt, imask);
"IBSS Beacon config, intval: %d, nexttbtt: %u, "
"resp_time: %d, imask: 0x%x\n",
bss_conf->beacon_interval, nexttbtt,
priv->ah->config.sw_beacon_response_time, imask);
WMI_CMD(WMI_DISABLE_INTR_CMDID);
ath9k_hw_beaconinit(priv->ah, TU_TO_USEC(nexttbtt), TU_TO_USEC(intval));
@ -317,6 +337,7 @@ static void ath9k_htc_send_buffered(struct ath9k_htc_priv *priv,
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;
@ -325,6 +346,7 @@ static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,
struct ieee80211_mgmt *mgmt;
struct sk_buff *beacon;
u8 *tx_fhdr;
int ret;
memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
@ -367,7 +389,14 @@ static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,
tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
htc_send(priv->htc, beacon, priv->beacon_ep, &tx_ctl);
ret = htc_send(priv->htc, beacon, priv->beacon_ep, &tx_ctl);
if (ret != 0) {
if (ret == -ENOMEM) {
ath_dbg(common, ATH_DBG_BSTUCK,
"Failed to send beacon, no free TX buffer\n");
}
dev_kfree_skb_any(beacon);
}
spin_unlock_bh(&priv->beacon_lock);
}