From: Dmitry Lebed <redacted>

Add wiphy flag to indicate that HW does all DFS actions by itself.
User-space functionality already implemented in hostapd using
vendor-specific (QCA) OUI to advertise HW support.
Need to introduce generic flag to inform about DFS offload support.
For deivces with DFS_OFFLOAD flag set user-space will no longer
need to issue CAC or do any actions in response to
"radar detected" events. HW will do everything by itself and send
events to user-space to idicate that CAC was started/finished, etc.

Signed-off-by: Dmitrii Lebed <redacted>
---
  include/net/cfg80211.h       | 7 ++++++-
  include/uapi/linux/nl80211.h | 9 +++++++++
  net/wireless/nl80211.c       | 7 +++++++
  3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index ed3a28105d6c..b2d17993ae4d 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h

@@ -3241,6 +3241,11 @@ struct cfg80211_ops {
   * @WIPHY_FLAG_IBSS_RSN: The device supports IBSS RSN.
   * @WIPHY_FLAG_MESH_AUTH: The device supports mesh authentication by routing
   *	auth frames to userspace. See @NL80211_MESH_SETUP_USERSPACE_AUTH.
+ * @WIPHY_FLAG_DFS_OFFLOAD: Device will do all DFS-related actions by itself,
+ *	informing user-space about CAC progress, radar detection event,
+ *	channel change triggered by radar detection event.
+ *	No need to start CAC from user-space, no need to react to
+ *	"radar detected" event.