[OpenWrt-Devel] [PATCH v2] mac80211: Add some missing 802.11n capabilities to hostapd configuration

[Robert Hancock]

Add some missing 802.11n capabilities to the hostapd ht_capab string when
supported by the hardware: Spatial Multiplexing Power-Save and 7935-byte AMSDUs.

Signed-off-by: Robert Hancock <hancockrwd at gmail.com>
---
 package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
index 1a85d15..72f9936 100644
--- a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
+++ b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
@@ -42,6 +42,8 @@ drv_mac80211_init_device_config() {
 		greenfield \
 		short_gi_20 \
 		short_gi_40 \
+		smps \
+		max_amsdu \
 		dsss_cck_40
 }
 
@@ -130,8 +132,10 @@ mac80211_hostapd_setup_base() {
 			greenfield:0 \
 			short_gi_20:1 \
 			short_gi_40:1 \
+			smps:1 \
 			tx_stbc:1 \
 			rx_stbc:3 \
+			max_amsdu:1 \
 			dsss_cck_40:1
 
 		ht_cap_mask=0
@@ -139,6 +143,8 @@ mac80211_hostapd_setup_base() {
 			ht_cap_mask="$(($ht_cap_mask | $cap))"
 		done
 
+		cap_smps=$((($ht_cap_mask >> 2) & 3))
+
 		cap_rx_stbc=$((($ht_cap_mask >> 8) & 3))
 		[ "$rx_stbc" -lt "$cap_rx_stbc" ] && cap_rx_stbc="$rx_stbc"
 		ht_cap_mask="$(( ($ht_cap_mask & ~(0x300)) | ($cap_rx_stbc << 8) ))"
@@ -152,8 +158,13 @@ mac80211_hostapd_setup_base() {
 			RX-STBC1:0x300:0x100:1 \
 			RX-STBC12:0x300:0x200:1 \
 			RX-STBC123:0x300:0x300:1 \
+			MAX-AMSDU-7935:0x800::$max_amsdu \
 			DSSS_CCK-40:0x1000::$dsss_cck_40
 
+		# SM Power Save: 0=static, 1=dynamic, 3=disabled
+		[ "$smps" = 1 -a "$cap_smps" = 0 ] && ht_capab_flags="$ht_capab_flags[SMPS-STATIC]"
+		[ "$smps" = 1 -a "$cap_smps" = 1 ] && ht_capab_flags="$ht_capab_flags[SMPS-DYNAMIC]"
+
 		ht_capab="$ht_capab$ht_capab_flags"
 		[ -n "$ht_capab" ] && append base_cfg "ht_capab=$ht_capab" "$N"
 	}
-- 
2.1.0
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