mac80211: query driver for max A-MPDU length exponent

This patch enables netifd to query 802.11ac-driver for the maximum
supported A-MPDU length exponent, possibly increasing VHT throughput by
more aggressive frame aggregation.

v2: refreshed patch

Signed-off-by: Matti Laakso <malaakso at elisanet.fi>
SVN-Revision: 40938

diff --git a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
index 3bd912dc0a889b332f1d789414ebff010dcfb6c9..b19b928cea10df17daa6a34362bcde1cd2b81e26 100644 (file)
--- a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
+++ b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
@@ -36,7 +36,7 @@ drv_mac80211_init_device_config() {
                htc_vht \
                rx_antenna_pattern \
                tx_antenna_pattern
-       config_add_int vht_max_mpdu vht_link_adapt vht160 rx_stbc tx_stbc
+       config_add_int vht_max_a_mpdu_len_exp vht_max_mpdu vht_link_adapt vht160 rx_stbc tx_stbc
 }
 
 drv_mac80211_init_iface_config() {
@@ -202,6 +202,7 @@ mac80211_hostapd_setup_base() {
                        htc_vht:1 \
                        rx_antenna_pattern:1 \
                        tx_antenna_pattern:1 \
+                       vht_max_a_mpdu_len_exp:7 \
                        vht_max_mpdu:11454 \
                        rx_stbc:4 \
                        tx_stbc:4 \
@@ -253,6 +254,24 @@ mac80211_hostapd_setup_base() {
                        vht_max_mpdu_hw=11454
                [ "$vht_max_mpdu_hw" != 3895 ] && \
                        vht_capab="$vht_capab[MAX-MPDU-$vht_max_mpdu_hw]"
+                       
+               # maximum A-MPDU length exponent
+               vht_max_a_mpdu_len_exp_hw=0
+               [ "$(($vht_cap & 58720256))" -ge 8388608 -a 1 -le "$vht_max_a_mpdu_len_exp" ] && \
+                       vht_max_a_mpdu_len_exp_hw=1
+               [ "$(($vht_cap & 58720256))" -ge 16777216 -a 2 -le "$vht_max_a_mpdu_len_exp" ] && \
+                       vht_max_a_mpdu_len_exp_hw=2
+               [ "$(($vht_cap & 58720256))" -ge 25165824 -a 3 -le "$vht_max_a_mpdu_len_exp" ] && \
+                       vht_max_a_mpdu_len_exp_hw=3
+               [ "$(($vht_cap & 58720256))" -ge 33554432 -a 4 -le "$vht_max_a_mpdu_len_exp" ] && \
+                       vht_max_a_mpdu_len_exp_hw=4
+               [ "$(($vht_cap & 58720256))" -ge 41943040 -a 5 -le "$vht_max_a_mpdu_len_exp" ] && \
+                       vht_max_a_mpdu_len_exp_hw=5
+               [ "$(($vht_cap & 58720256))" -ge 50331648 -a 6 -le "$vht_max_a_mpdu_len_exp" ] && \
+                       vht_max_a_mpdu_len_exp_hw=6
+               [ "$(($vht_cap & 58720256))" -ge 58720256 -a 7 -le "$vht_max_a_mpdu_len_exp" ] && \
+                       vht_max_a_mpdu_len_exp_hw=7
+               vht_capab="$vht_capab[MAX-A-MPDU-LEN-EXP$vht_max_a_mpdu_len_exp_hw]"
 
                # whether or not the STA supports link adaptation using VHT variant
                vht_link_adapt_hw=0