iwlwifi: turn on RTS/CTS after aggregation become operational

If RTS/CTS protection is needed for HT, wait until get operational
notification from mac80211, then inform uCode to switch to RTS/CTS
through RXON command.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

1 files changed, 27 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 7488a68b83b1..3368cfd25a99 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3368,6 +3368,25 @@ static int iwl_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
         return ret;
 }
 
+/*
+ * switch to RTS/CTS for TX
+ */
+static void iwl_enable_rts_cts(struct iwl_priv *priv)
+{
+
+        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
+                return;
+
+        priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
+        if (!test_bit(STATUS_SCANNING, &priv->status)) {
+                IWL_DEBUG_INFO(priv, "use RTS/CTS protection\n");
+                iwlcore_commit_rxon(priv);
+        } else {
+                /* scanning, defer the request until scan completed */
+                IWL_DEBUG_INFO(priv, "defer setting RTS/CTS protection\n");
+        }
+}
+
 static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
                                 struct ieee80211_vif *vif,
                                 enum ieee80211_ampdu_mlme_action action,
@@ -3416,7 +3435,14 @@ static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
                         ret = 0;
                 break;
         case IEEE80211_AMPDU_TX_OPERATIONAL:
-                /* do nothing, return value ignored */
+                if (priv->cfg->use_rts_for_ht) {
+                        /*
+                         * switch to RTS/CTS if it is the prefer protection
+                         * method for HT traffic
+                         */
+                        iwl_enable_rts_cts(priv);
+                }
+                ret = 0;
                 break;
         }
         mutex_unlock(&priv->mutex);