From: Sujith Manoharan <Sujith.Manoharan@xxxxxxxxxxx> 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@xxxxxxxxxxx> --- drivers/net/wireless/ath/ath9k/htc.h | 7 ++++ drivers/net/wireless/ath/ath9k/htc_drv_beacon.c | 41 +++++++++++++++++++--- 2 files changed, 42 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h index 912cce8..3aa73fc 100644 --- a/drivers/net/wireless/ath/ath9k/htc.h +++ b/drivers/net/wireless/ath/ath9k/htc.h @@ -357,6 +357,13 @@ 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; diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c b/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c index 927bb27..42a1758 100644 --- a/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c +++ b/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c @@ -197,6 +197,15 @@ 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) { intval |= ATH9K_BEACON_RESET_TSF; priv->op_flags &= ~OP_TSF_RESET; @@ -217,10 +226,11 @@ 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, tsf_reset: %d\n", - bss_conf->beacon_interval, nexttbtt, imask, - !!(intval & ATH9K_BEACON_RESET_TSF)); + bss_conf->beacon_interval, nexttbtt, + priv->ah->config.sw_beacon_response_time, + imask, !!(intval & ATH9K_BEACON_RESET_TSF)); ath9k_htc_beaconq_config(priv); @@ -254,13 +264,23 @@ 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; + intval |= ATH9K_BEACON_ENA; 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, nexttbtt, intval); @@ -320,6 +340,7 @@ 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; @@ -328,6 +349,7 @@ 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)); @@ -370,7 +392,14 @@ 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); } -- 1.7.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html