iwlwifi: Fix handling of retry count of NO_ACK frames in iwl-{3945|agn}-rs

Make iwl-{3945|agn}-rs check for IEEE80211_TX_CTL_NO_ACK instead of
is_multicast_ether_addr when determining whether to use the lowest
rate, and set the retry count to 0 (total try count = 1) if
IEEE80211_TX_CTL_NO_ACK is set.

Signed-off-by: Gábor Stefanik <netrolller.3d@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index 3504279c7586..29d38b938f38 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -172,7 +172,7 @@ struct iwl_lq_sta {
 };
 
 static void rs_rate_scale_perform(struct iwl_priv *priv,
-                                   struct ieee80211_hdr *hdr,
+                                   struct sk_buff *skb,
                                    struct ieee80211_sta *sta,
                                    struct iwl_lq_sta *lq_sta);
 static void rs_fill_link_cmd(const struct iwl_priv *priv,
@@ -829,7 +829,7 @@ static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 
         if (!ieee80211_is_data(hdr->frame_control) ||
-            is_multicast_ether_addr(hdr->addr1))
+            info->flags & IEEE80211_TX_CTL_NO_ACK)
                 return;
 
         /* This packet was aggregated but doesn't carry rate scale info */
@@ -995,7 +995,7 @@ static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 
         /* See if there's a better rate or modulation mode to try. */
         if (sta && sta->supp_rates[sband->band])
-                rs_rate_scale_perform(priv, hdr, sta, lq_sta);
+                rs_rate_scale_perform(priv, skb, sta, lq_sta);
 out:
         return;
 }
@@ -1975,12 +1975,14 @@ static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
  * Do rate scaling and search for new modulation mode.
  */
 static void rs_rate_scale_perform(struct iwl_priv *priv,
-                                  struct ieee80211_hdr *hdr,
+                                  struct sk_buff *skb,
                                   struct ieee80211_sta *sta,
                                   struct iwl_lq_sta *lq_sta)
 {
         struct ieee80211_hw *hw = priv->hw;
         struct ieee80211_conf *conf = &hw->conf;
+        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
         int low = IWL_RATE_INVALID;
         int high = IWL_RATE_INVALID;
         int index;
@@ -2006,11 +2008,10 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
 
         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
 
-        /* Send management frames and broadcast/multicast data using
-         * lowest rate. */
+        /* Send management frames and NO_ACK data using lowest rate. */
         /* TODO: this could probably be improved.. */
         if (!ieee80211_is_data(hdr->frame_control) ||
-            is_multicast_ether_addr(hdr->addr1))
+            info->flags & IEEE80211_TX_CTL_NO_ACK)
                 return;
 
         if (!sta || !lq_sta)
@@ -2450,16 +2451,17 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
         if (sta)
                 mask_bit = sta->supp_rates[sband->band];
 
-        /* Send management frames and broadcast/multicast data using lowest
-         * rate. */
+        /* Send management frames and NO_ACK data using lowest rate. */
         if (!ieee80211_is_data(hdr->frame_control) ||
-            is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
+            info->flags & IEEE80211_TX_CTL_NO_ACK || !sta || !lq_sta) {
                 if (!mask_bit)
                         info->control.rates[0].idx =
                                         rate_lowest_index(sband, NULL);
                 else
                         info->control.rates[0].idx =
                                         rate_lowest_index(sband, sta);
+                if (info->flags & IEEE80211_TX_CTL_NO_ACK)
+                        info->control.rates[0].count = 1;
                 return;
         }