qtnfmac: allow to control DFS slave radar detection

In ETSI region DFS slave device can operate in two modes on DFS channels:
 - do on-channel radar detection and use higher Tx power
 - don't do radar detection and use lower Tx power as a consequence

Allow user to control that behavior through qtnfmac module parameter.
Signed-off-by: Igor Mitsyanko <igor.mitsyanko.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/cfg80211.c

@@ -1008,7 +1008,7 @@ static void qtnf_cfg80211_reg_notifier(struct wiphy *wiphy,
 	pr_debug("MAC%u: initiator=%d alpha=%c%c\n", mac->macid, req->initiator,
 		 req->alpha2[0], req->alpha2[1]);
 
-	ret = qtnf_cmd_reg_notify(mac, req);
+	ret = qtnf_cmd_reg_notify(mac, req, qtnf_mac_slave_radar_get(wiphy));
 	if (ret) {
 		pr_err("MAC%u: failed to update region to %c%c: %d\n",
 		       mac->macid, req->alpha2[0], req->alpha2[1], ret);

drivers/net/wireless/quantenna/qtnfmac/commands.c

@@ -2367,7 +2367,8 @@ int qtnf_cmd_send_updown_intf(struct qtnf_vif *vif, bool up)
 	return ret;
 }
 
-int qtnf_cmd_reg_notify(struct qtnf_wmac *mac, struct regulatory_request *req)
+int qtnf_cmd_reg_notify(struct qtnf_wmac *mac, struct regulatory_request *req,
+			bool slave_radar)
 {
 	struct wiphy *wiphy = priv_to_wiphy(mac);
 	struct qtnf_bus *bus = mac->bus;
@@ -2429,6 +2430,7 @@ int qtnf_cmd_reg_notify(struct qtnf_wmac *mac, struct regulatory_request *req)
 		break;
 	}
 
+	cmd->slave_radar = slave_radar;
 	cmd->num_channels = 0;
 
 	for (band = 0; band < NUM_NL80211_BANDS; band++) {

drivers/net/wireless/quantenna/qtnfmac/commands.h

@@ -57,7 +57,8 @@ int qtnf_cmd_send_disconnect(struct qtnf_vif *vif,
 			     u16 reason_code);
 int qtnf_cmd_send_updown_intf(struct qtnf_vif *vif,
 			      bool up);
-int qtnf_cmd_reg_notify(struct qtnf_wmac *mac, struct regulatory_request *req);
+int qtnf_cmd_reg_notify(struct qtnf_wmac *mac, struct regulatory_request *req,
+			bool slave_radar);
 int qtnf_cmd_get_chan_stats(struct qtnf_wmac *mac, u16 channel,
 			    struct qtnf_chan_stats *stats);
 int qtnf_cmd_send_chan_switch(struct qtnf_vif *vif,

drivers/net/wireless/quantenna/qtnfmac/core.c

@@ -16,6 +16,10 @@
 #define QTNF_DMP_MAX_LEN 48
 #define QTNF_PRIMARY_VIF_IDX	0
 
+static bool slave_radar = true;
+module_param(slave_radar, bool, 0644);
+MODULE_PARM_DESC(slave_radar, "set 0 to disable radar detection in slave mode");
+
 struct qtnf_frame_meta_info {
 	u8 magic_s;
 	u8 ifidx;
@@ -426,6 +430,11 @@ static struct qtnf_wmac *qtnf_core_mac_alloc(struct qtnf_bus *bus,
 	return mac;
 }
 
+bool qtnf_mac_slave_radar_get(struct wiphy *wiphy)
+{
+	return slave_radar;
+}
+
 static const struct ethtool_ops qtnf_ethtool_ops = {
 	.get_drvinfo = cfg80211_get_drvinfo,
 };

drivers/net/wireless/quantenna/qtnfmac/core.h

@@ -134,6 +134,7 @@ struct qtnf_vif *qtnf_mac_get_free_vif(struct qtnf_wmac *mac);
 struct qtnf_vif *qtnf_mac_get_base_vif(struct qtnf_wmac *mac);
 void qtnf_mac_iface_comb_free(struct qtnf_wmac *mac);
 void qtnf_mac_ext_caps_free(struct qtnf_wmac *mac);
+bool qtnf_mac_slave_radar_get(struct wiphy *wiphy);
 struct wiphy *qtnf_wiphy_allocate(struct qtnf_bus *bus);
 int qtnf_core_net_attach(struct qtnf_wmac *mac, struct qtnf_vif *priv,
 			 const char *name, unsigned char name_assign_type);

drivers/net/wireless/quantenna/qtnfmac/qlink.h

@@ -588,6 +588,7 @@ enum qlink_user_reg_hint_type {
  *	of &enum qlink_user_reg_hint_type.
  * @num_channels: number of &struct qlink_tlv_channel in a variable portion of a
  *	payload.
+ * @slave_radar: whether slave device should enable radar detection.
  * @dfs_region: one of &enum qlink_dfs_regions.
  * @info: variable portion of regulatory notifier callback.
  */
@@ -598,7 +599,8 @@ struct qlink_cmd_reg_notify {
 	u8 user_reg_hint_type;
 	u8 num_channels;
 	u8 dfs_region;
-	u8 rsvd[2];
+	u8 slave_radar;
+	u8 rsvd[1];
 	u8 info[0];
 } __packed;