[][MAC80211][core][Mark DFS channel available for CSA]
[Description]
Add optional parameter to mark DFS channel as available for CSA.
WFA TGac VHT-4.2.16h-DFS requires CSA while switching to DFS channel.
Hostapd original behavior is to disable/enable interface to move to new
channel.
"skip_cac" parameter is optional in command hostapd_cli chan_switch.
When not used, original hostapd behavior is followed for channel switch.
Use NL80211_ATTR_RADAR_BACKGROUND attribute for skipping CAC.
[Release-log]
Change-Id: I24ef8aa8f129bcc62a5ac4898cac331e93d60d4c
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7162083
diff --git a/autobuild_mac80211_release/package/kernel/mac80211/patches/subsys/mtk-0015-nl80211-mtk-Mark-DFS-channel-as-available-for-CSA.patch b/autobuild_mac80211_release/package/kernel/mac80211/patches/subsys/mtk-0015-nl80211-mtk-Mark-DFS-channel-as-available-for-CSA.patch
new file mode 100644
index 0000000..eff574e
--- /dev/null
+++ b/autobuild_mac80211_release/package/kernel/mac80211/patches/subsys/mtk-0015-nl80211-mtk-Mark-DFS-channel-as-available-for-CSA.patch
@@ -0,0 +1,28 @@
+From 20d6ed31c0e6c15cfbc120bea6a8729121560371 Mon Sep 17 00:00:00 2001
+From: "himanshu.goyal" <himanshu.goyal@mediatek.com>
+Date: Tue, 21 Feb 2023 15:24:09 +0800
+Subject: [PATCH] nl80211: mtk: Mark DFS channel as available for CSA.
+
+---
+ net/wireless/nl80211.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
+index 8dc928d..a02aacb 100644
+--- a/net/wireless/nl80211.c
++++ b/net/wireless/nl80211.c
+@@ -3193,6 +3193,11 @@ int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
+ return -EINVAL;
+ }
+
++ /* Use RADAR_BACKGROUND attribute here for skipping CAC */
++ if (info->attrs[NL80211_ATTR_RADAR_BACKGROUND]) {
++ cfg80211_set_dfs_state(&rdev->wiphy, chandef, NL80211_DFS_AVAILABLE);
++ }
++
+ if (!cfg80211_chandef_usable(&rdev->wiphy, chandef,
+ IEEE80211_CHAN_DISABLED)) {
+ NL_SET_ERR_MSG(extack, "(extension) channel is disabled");
+--
+2.18.0
+