iwlwifi: W/A for the TSF correction in IBSS

This patch is a W/A for the TSF sync issue in IBSS merging. HW is not
capable to sync TSF (it's constantly little behind). This creates
constant IBSS merging upon reception of each beacon, adding and removing
station which in turn creates above 50% packet loss and thus dramatically
degrade the throughput. The W/A simply stops the driver from declaring it
has a reliable TSF value and thus eliminates IBSS merging.

Signed-off-by: Assaf Krauss <assaf.krauss@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index c0b73c4d6f44d05c44adea2799e6152e5c099599..2afa1fb052eea6eac96e8ae163aefecc925c7717 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3588,7 +3588,7 @@ static int iwl4965_mac_beacon_update(struct ieee80211_hw *hw, struct sk_buff *sk
 
        priv->assoc_id = 0;
        timestamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
-       priv->timestamp = le64_to_cpu(timestamp) +  (priv->beacon_int * 1000);
+       priv->timestamp = le64_to_cpu(timestamp);
 
        IWL_DEBUG_MAC80211("leave\n");
        spin_unlock_irqrestore(&priv->lock, flags);

diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index f3f6ea49fdd2d0f287e2d0ca891483dd8faf97bd..e81bfc42a7cb7ced067f255641ade21107e03963 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -1173,7 +1173,10 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
 
        rx_status.antenna = 0;
        rx_status.flag = 0;
-       rx_status.flag |= RX_FLAG_TSFT;
+
+       /* TSF isn't reliable. In order to allow smooth user experience,
+        * this W/A doesn't propagate it to the mac80211 */
+       /*rx_status.flag |= RX_FLAG_TSFT;*/
 
        if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
                IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",