[openwrt/openwrt] mac80211: parse the correct set of HE capabilities for AP mode

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/f338f76a66a50d201ae57c98852aa9c74e9e278a

commit f338f76a66a50d201ae57c98852aa9c74e9e278a
Author: Sultan Alsawaf <sultan at kerneltoast.com>
AuthorDate: Thu Jul 21 23:36:31 2022 -0700

    mac80211: parse the correct set of HE capabilities for AP mode
    
    It is common for 802.11ax NICs to support more than just AP mode, which
    results in there being a distinct set of HE capabilities for each mode. As
    (bad) luck would have it, iw prints out info for each HE mode in sequential
    order according to `enum nl80211_iftype`, and AP mode isn't always first.
    
    As a result, the wrong set of HE capabilities can be parsed if an AP NIC
    supports station (managed) mode or any other mode preceding AP mode, since
    only the first set of HE capabilities printed by iw is parsed from awk's
    output.
    
    This has a noticeable impact on beamforming for example, since managed mode
    usually doesn't have beamformer capabilities enabled, while AP mode does.
    Hostapd won't be set up with the configs to enable beamformer capabilities
    in this scenario, causing hostapd to disable beamforming to HE stations
    even when it's supported by the AP.
    
    Always parse the correct set of HE capabilities for AP mode to fix this.
    This is achieved by trimming all of iw's output prior to the AP mode
    capabilities, which ensures that the first set of HE capabilities are
    always for AP mode.
    
    Signed-off-by: Sultan Alsawaf <sultan at kerneltoast.com>
---
 package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
index 62afd9e6a0..f524940854 100644
--- a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
+++ b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
@@ -421,9 +421,9 @@ mac80211_hostapd_setup_base() {
 			he_spr_non_srg_obss_pd_max_offset:1 \
 			he_bss_color
 
-		he_phy_cap=$(iw phy "$phy" info | awk -F "[()]" '/HE PHY Capabilities/ { print $2 }' | head -1)
+		he_phy_cap=$(iw phy "$phy" info | sed -n '/HE Iftypes: AP/,$p' | awk -F "[()]" '/HE PHY Capabilities/ { print $2 }' | head -1)
 		he_phy_cap=${he_phy_cap:2}
-		he_mac_cap=$(iw phy "$phy" info | awk -F "[()]" '/HE MAC Capabilities/ { print $2 }' | head -1)
+		he_mac_cap=$(iw phy "$phy" info | sed -n '/HE Iftypes: AP/,$p' | awk -F "[()]" '/HE MAC Capabilities/ { print $2 }' | head -1)
 		he_mac_cap=${he_mac_cap:2}
 
 		append base_cfg "ieee80211ax=1" "$N"