nl80211: Add support to offload SA Query procedures for AP SME device

Add a flag attribute to use in ap settings to indicate userspace
supports offloading of SA Query procedures to driver. Also add AP SME
device feature flag to advertise that the SA Query procedures offloaded
to driver when userspace indicates support for offloading of SA Query
procedures.

Driver handles SA Query procedures in driver's SME it self and skip
sending SA Query request or response frames to userspace when userspace
indicates support for SA Query procedures offload. But if userspace
doesn't advertise support for SA Query procedures offload driver shall
not offload SA Query procedures handling.

Also userspace with SA Query procedures offload capability shall skip SA
Query specific validations when driver indicates support for handling SA
Query procedures.
Signed-off-by: Veerendranath Jakkam <vjakkam@codeaurora.org>
Link: https://lore.kernel.org/r/1637911519-21306-2-git-send-email-vjakkam@codeaurora.orgSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/uapi/linux/nl80211.h

@@ -5760,13 +5760,15 @@ enum nl80211_tdls_operation {
 	NL80211_TDLS_DISABLE_LINK,
 };
 
-/*
+/**
  * enum nl80211_ap_sme_features - device-integrated AP features
- * Reserved for future use, no bits are defined in
- * NL80211_ATTR_DEVICE_AP_SME yet.
+ * @NL80211_AP_SME_SA_QUERY_OFFLOAD: SA Query procedures offloaded to driver
+ *	when user space indicates support for SA Query procedures offload during
+ *	"start ap" with %NL80211_AP_SETTINGS_SA_QUERY_OFFLOAD_SUPPORT.
+ */
 enum nl80211_ap_sme_features {
+	NL80211_AP_SME_SA_QUERY_OFFLOAD		= 1 << 0,
 };
- */
 
 /**
  * enum nl80211_feature_flags - device/driver features
@@ -7494,9 +7496,15 @@ enum nl80211_mbssid_config_attributes {
  *
  * @NL80211_AP_SETTINGS_EXTERNAL_AUTH_SUPPORT: AP supports external
  *	authentication.
+ * @NL80211_AP_SETTINGS_SA_QUERY_OFFLOAD_SUPPORT: Userspace supports SA Query
+ *	procedures offload to driver. If driver advertises
+ *	%NL80211_AP_SME_SA_QUERY_OFFLOAD in AP SME features, userspace shall
+ *	ignore SA Query procedures and validations when this flag is set by
+ *	userspace.
  */
 enum nl80211_ap_settings_flags {
 	NL80211_AP_SETTINGS_EXTERNAL_AUTH_SUPPORT	= 1 << 0,
+	NL80211_AP_SETTINGS_SA_QUERY_OFFLOAD_SUPPORT	= 1 << 1,
 };
 
 #endif /* __LINUX_NL80211_H */