ath9k: raise aggregation limit to 64k for HT IBSS

mac80211 adds stations in HT IBSS as soon as a frame comes by,
even if the HT capabilities are not known yet (they are often
received later, e.g. in beacons). So far, ampdu factor/density
are only calculated when the station is initially added.

This patch changes this to update ampdu factor/density settings
when starting a blockack session.

Using this patch, we had performance boosts from 60 to 150 MBit/s
between two 2x2 Atheros devices in 5 GHz HT IBSS mode.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 17 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index a8c050085648..4473278efc5e 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -721,6 +721,7 @@ extern int ath9k_modparam_nohwcrypt;
 extern int led_blink;
 extern bool is_ath9k_unloaded;
 
+u8 ath9k_parse_mpdudensity(u8 mpdudensity);
 irqreturn_t ath_isr(int irq, void *dev);
 int ath9k_init_device(u16 devid, struct ath_softc *sc,
                     const struct ath_bus_ops *bus_ops);
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 85f9ab4fa26e..e2e69585d674 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -19,7 +19,7 @@
 #include "ath9k.h"
 #include "btcoex.h"
 
-static u8 parse_mpdudensity(u8 mpdudensity)
+u8 ath9k_parse_mpdudensity(u8 mpdudensity)
 {
         /*
          * 802.11n D2.0 defined values for "Minimum MPDU Start Spacing":
@@ -320,6 +320,7 @@ static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta,
                             struct ieee80211_vif *vif)
 {
         struct ath_node *an;
+        u8 density;
         an = (struct ath_node *)sta->drv_priv;
 
 #ifdef CONFIG_ATH9K_DEBUGFS
@@ -334,7 +335,8 @@ static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta,
                 ath_tx_node_init(sc, an);
                 an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
                                      sta->ht_cap.ampdu_factor);
-                an->mpdudensity = parse_mpdudensity(sta->ht_cap.ampdu_density);
+                density = ath9k_parse_mpdudensity(sta->ht_cap.ampdu_density);
+                an->mpdudensity = density;
         }
 }
 
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index f777ddcd1172..2afc5e289df5 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1175,6 +1175,7 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
 {
         struct ath_atx_tid *txtid;
         struct ath_node *an;
+        u8 density;
 
         an = (struct ath_node *)sta->drv_priv;
         txtid = ATH_AN_2_TID(an, tid);
@@ -1182,6 +1183,17 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
         if (txtid->state & (AGGR_CLEANUP | AGGR_ADDBA_COMPLETE))
                 return -EAGAIN;
 
+        /* update ampdu factor/density, they may have changed. This may happen
+         * in HT IBSS when a beacon with HT-info is received after the station
+         * has already been added.
+         */
+        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) {
+                an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
+                                     sta->ht_cap.ampdu_factor);
+                density = ath9k_parse_mpdudensity(sta->ht_cap.ampdu_density);
+                an->mpdudensity = density;
+        }
+
         txtid->state |= AGGR_ADDBA_PROGRESS;
         txtid->paused = true;
         *ssn = txtid->seq_start = txtid->seq_next;