iwlagn: support off-channel TX

Add support to iwlagn for off-channel TX. The
microcode API for this is a bit strange in that
it uses a hacked-up scan command, so the scan
code needs to change quite a bit to accomodate
that and be able to send it out.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 24 insertions, 17 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
index faa6d34cb65..3a4d9e6b042 100644
--- a/drivers/net/wireless/iwlwifi/iwl-scan.c
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -101,7 +101,7 @@ static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
 		ieee80211_scan_completed(priv->hw, aborted);
 	}
 
-	priv->is_internal_short_scan = false;
+	priv->scan_type = IWL_SCAN_NORMAL;
 	priv->scan_vif = NULL;
 	priv->scan_request = NULL;
 }
@@ -339,10 +339,10 @@ void iwl_init_scan_params(struct iwl_priv *priv)
 		priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
 }
 
-static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
-					  struct ieee80211_vif *vif,
-					  bool internal,
-					  enum ieee80211_band band)
+int __must_check iwl_scan_initiate(struct iwl_priv *priv,
+				   struct ieee80211_vif *vif,
+				   enum iwl_scan_type scan_type,
+				   enum ieee80211_band band)
 {
 	int ret;
 
@@ -370,17 +370,19 @@ static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
 	}
 
 	IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
-			internal ? "internal short " : "");
+			scan_type == IWL_SCAN_NORMAL ? "" :
+			scan_type == IWL_SCAN_OFFCH_TX ? "offchan TX " :
+			"internal short ");
 
 	set_bit(STATUS_SCANNING, &priv->status);
-	priv->is_internal_short_scan = internal;
+	priv->scan_type = scan_type;
 	priv->scan_start = jiffies;
 	priv->scan_band = band;
 
 	ret = priv->cfg->ops->utils->request_scan(priv, vif);
 	if (ret) {
 		clear_bit(STATUS_SCANNING, &priv->status);
-		priv->is_internal_short_scan = false;
+		priv->scan_type = IWL_SCAN_NORMAL;
 		return ret;
 	}
 
@@ -405,7 +407,7 @@ int iwl_mac_hw_scan(struct ieee80211_hw *hw,
 	mutex_lock(&priv->mutex);
 
 	if (test_bit(STATUS_SCANNING, &priv->status) &&
-	    !priv->is_internal_short_scan) {
+	    priv->scan_type != IWL_SCAN_NORMAL) {
 		IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
 		ret = -EAGAIN;
 		goto out_unlock;
@@ -419,11 +421,11 @@ int iwl_mac_hw_scan(struct ieee80211_hw *hw,
 	 * If an internal scan is in progress, just set
 	 * up the scan_request as per above.
 	 */
-	if (priv->is_internal_short_scan) {
+	if (priv->scan_type != IWL_SCAN_NORMAL) {
 		IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
 		ret = 0;
 	} else
-		ret = iwl_scan_initiate(priv, vif, false,
+		ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
 					req->channels[0]->band);
 
 	IWL_DEBUG_MAC80211(priv, "leave\n");
@@ -452,7 +454,7 @@ static void iwl_bg_start_internal_scan(struct work_struct *work)
 
 	mutex_lock(&priv->mutex);
 
-	if (priv->is_internal_short_scan == true) {
+	if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
 		IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
 		goto unlock;
 	}
@@ -462,7 +464,7 @@ static void iwl_bg_start_internal_scan(struct work_struct *work)
 		goto unlock;
 	}
 
-	if (iwl_scan_initiate(priv, NULL, true, priv->band))
+	if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
 		IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
  unlock:
 	mutex_unlock(&priv->mutex);
@@ -549,8 +551,7 @@ static void iwl_bg_scan_completed(struct work_struct *work)
 	    container_of(work, struct iwl_priv, scan_completed);
 	bool aborted;
 
-	IWL_DEBUG_SCAN(priv, "Completed %sscan.\n",
-		       priv->is_internal_short_scan ? "internal short " : "");
+	IWL_DEBUG_SCAN(priv, "Completed scan.\n");
 
 	cancel_delayed_work(&priv->scan_check);
 
@@ -565,7 +566,13 @@ static void iwl_bg_scan_completed(struct work_struct *work)
 		goto out_settings;
 	}
 
-	if (priv->is_internal_short_scan && !aborted) {
+	if (priv->scan_type == IWL_SCAN_OFFCH_TX && priv->_agn.offchan_tx_skb) {
+		ieee80211_tx_status_irqsafe(priv->hw,
+					    priv->_agn.offchan_tx_skb);
+		priv->_agn.offchan_tx_skb = NULL;
+	}
+
+	if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
 		int err;
 
 		/* Check if mac80211 requested scan during our internal scan */
@@ -573,7 +580,7 @@ static void iwl_bg_scan_completed(struct work_struct *work)
 			goto out_complete;
 
 		/* If so request a new scan */
-		err = iwl_scan_initiate(priv, priv->scan_vif, false,
+		err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
 					priv->scan_request->channels[0]->band);
 		if (err) {
 			IWL_DEBUG_SCAN(priv,