wl12xx: Set IEEE80211_TX_RC_MCS on MCS rates on TX complete.

IEEE80211_TX_RC_MCS was not set correctly leading to incorrect link
speed calculation.

Signed-off-by: Pontus Fuchs <pontus.fuchs@gmail.com>
Signed-off-by: Ido Reis <idor@ti.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/conf.h

@@ -91,6 +91,10 @@ enum {
 	CONF_HW_RXTX_RATE_UNSUPPORTED = 0xff
 };
 
+/* Rates between and including these are MCS rates */
+#define CONF_HW_RXTX_RATE_MCS_MIN CONF_HW_RXTX_RATE_MCS7
+#define CONF_HW_RXTX_RATE_MCS_MAX CONF_HW_RXTX_RATE_MCS0
+
 enum {
 	CONF_SG_DISABLE = 0,
 	CONF_SG_PROTECTIVE,

drivers/net/wireless/wl12xx/tx.c

@@ -764,6 +764,14 @@ out:
 	mutex_unlock(&wl->mutex);
 }
 
+static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
+{
+	if (rate_class_index >= CONF_HW_RXTX_RATE_MCS_MIN &&
+	    rate_class_index <= CONF_HW_RXTX_RATE_MCS_MAX)
+		return IEEE80211_TX_RC_MCS;
+	return 0;
+}
+
 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 				      struct wl1271_tx_hw_res_descr *result)
 {
@@ -773,6 +781,7 @@ static void wl1271_tx_complete_packet(struct wl1271 *wl,
 	struct sk_buff *skb;
 	int id = result->id;
 	int rate = -1;
+	u8 rate_flags = 0;
 	u8 retries = 0;
 
 	/* check for id legality */
@@ -799,6 +808,7 @@ static void wl1271_tx_complete_packet(struct wl1271 *wl,
 			info->flags |= IEEE80211_TX_STAT_ACK;
 		rate = wl1271_rate_to_idx(result->rate_class_index,
 					  wlvif->band);
+		rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 		retries = result->ack_failures;
 	} else if (result->status == TX_RETRY_EXCEEDED) {
 		wl->stats.excessive_retries++;
@@ -807,7 +817,7 @@ static void wl1271_tx_complete_packet(struct wl1271 *wl,
 
 	info->status.rates[0].idx = rate;
 	info->status.rates[0].count = retries;
-	info->status.rates[0].flags = 0;
+	info->status.rates[0].flags = rate_flags;
 	info->status.ack_signal = -1;
 
 	wl->stats.retry_count += result->ack_failures;