ath9k: fix rate control fallback rate selection - improves throughput and link stability

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19716 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/mac80211/patches/530-ath9k_rc_fallback.patch b/package/mac80211/patches/530-ath9k_rc_fallback.patch
new file mode 100644 (file)
index 0000000..1b74eb5
--- /dev/null
+++ b/package/mac80211/patches/530-ath9k_rc_fallback.patch
@@ -0,0 +1,55 @@
+--- a/drivers/net/wireless/ath/ath9k/rc.c
++++ b/drivers/net/wireless/ath/ath9k/rc.c
+@@ -668,7 +668,7 @@ static void ath_get_rate(void *priv, str
+       struct ieee80211_tx_rate *rates = tx_info->control.rates;
+       struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+       __le16 fc = hdr->frame_control;
+-      u8 try_per_rate, i = 0, rix, nrix;
++      u8 try_per_rate, i = 0, rix;
+       int is_probe = 0;
+ 
+       if (rate_control_send_low(sta, priv_sta, txrc))
+@@ -688,26 +688,25 @@ static void ath_get_rate(void *priv, str
+ 
+       rate_table = sc->cur_rate_table;
+       rix = ath_rc_get_highest_rix(sc, ath_rc_priv, rate_table, &is_probe);
+-      nrix = rix;
+ 
+       if (is_probe) {
+               /* set one try for probe rates. For the
+                * probes don't enable rts */
+               ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
+-                                     1, nrix, 0);
++                                     1, rix, 0);
+ 
+               /* Get the next tried/allowed rate. No RTS for the next series
+                * after the probe rate
+                */
+-              ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
++              ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
+               ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
+-                                     try_per_rate, nrix, 0);
++                                     try_per_rate, rix, 0);
+ 
+               tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
+       } else {
+               /* Set the choosen rate. No RTS for first series entry. */
+               ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
+-                                     try_per_rate, nrix, 0);
++                                     try_per_rate, rix, 0);
+       }
+ 
+       /* Fill in the other rates for multirate retry */
+@@ -716,10 +715,10 @@ static void ath_get_rate(void *priv, str
+               if (i + 1 == 4)
+                       try_per_rate = 8;
+ 
+-              ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
++              ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
+               /* All other rates in the series have RTS enabled */
+               ath_rc_rate_set_series(rate_table, &rates[i], txrc,
+-                                     try_per_rate, nrix, 1);
++                                     try_per_rate, rix, 1);
+       }
+ 
+       /*