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>
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index f777ddc..2afc5e2 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1175,6 +1175,7 @@
{
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 @@
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;