hostapd: make it possible to update station airtime weights via ubus

This allows dynamic tuning based on other runtime information

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/network/services/hostapd/patches/600-ubus_support.patch

@@ -473,3 +473,44 @@
  	/* Proceed only if DFS is not offloaded to the driver */
  	if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
  		return 0;
+--- a/src/ap/airtime_policy.c
++++ b/src/ap/airtime_policy.c
+@@ -112,8 +112,14 @@ static void set_sta_weights(struct hosta
+ {
+ 	struct sta_info *sta;
+ 
+-	for (sta = hapd->sta_list; sta; sta = sta->next)
+-		sta_set_airtime_weight(hapd, sta, weight);
++	for (sta = hapd->sta_list; sta; sta = sta->next) {
++		unsigned int sta_weight = weight;
++
++		if (sta->dyn_airtime_weight)
++			sta_weight = (weight * sta->dyn_airtime_weight) / 256;
++
++		sta_set_airtime_weight(hapd, sta, sta_weight);
++	}
+ }
+ 
+ 
+@@ -244,7 +250,10 @@ int airtime_policy_new_sta(struct hostap
+ 	unsigned int weight;
+ 
+ 	if (hapd->iconf->airtime_mode == AIRTIME_MODE_STATIC) {
+-		weight = get_weight_for_sta(hapd, sta->addr);
++		if (sta->dyn_airtime_weight)
++			weight = sta->dyn_airtime_weight;
++		else
++			weight = get_weight_for_sta(hapd, sta->addr);
+ 		if (weight)
+ 			return sta_set_airtime_weight(hapd, sta, weight);
+ 	}
+--- a/src/ap/sta_info.h
++++ b/src/ap/sta_info.h
+@@ -324,6 +324,7 @@ struct sta_info {
+ #endif /* CONFIG_TESTING_OPTIONS */
+ #ifdef CONFIG_AIRTIME_POLICY
+ 	unsigned int airtime_weight;
++	unsigned int dyn_airtime_weight;
+ 	struct os_reltime backlogged_until;
+ #endif /* CONFIG_AIRTIME_POLICY */
+ 

package/network/services/hostapd/src/src/ap/ubus.c

@@ -21,6 +21,7 @@
 #include "rrm.h"
 #include "wnm_ap.h"
 #include "taxonomy.h"
+#include "airtime_policy.h"
 
 static struct ubus_context *ctx;
 static struct blob_buf b;
@@ -1326,11 +1327,68 @@ hostapd_wnm_disassoc_imminent(struct ubus_context *ctx, struct ubus_object *obj,
 }
 #endif
 
+#ifdef CONFIG_AIRTIME_POLICY
+enum {
+	UPDATE_AIRTIME_STA,
+	UPDATE_AIRTIME_WEIGHT,
+	__UPDATE_AIRTIME_MAX,
+};
+
+
+static const struct blobmsg_policy airtime_policy[__UPDATE_AIRTIME_MAX] = {
+	[UPDATE_AIRTIME_STA] = { "sta", BLOBMSG_TYPE_STRING },
+	[UPDATE_AIRTIME_WEIGHT] = { "weight", BLOBMSG_TYPE_INT32 },
+};
+
+static int
+hostapd_bss_update_airtime(struct ubus_context *ctx, struct ubus_object *obj,
+			   struct ubus_request_data *ureq, const char *method,
+			   struct blob_attr *msg)
+{
+	struct hostapd_data *hapd = container_of(obj, struct hostapd_data, ubus.obj);
+	struct blob_attr *tb[__UPDATE_AIRTIME_MAX];
+	struct sta_info *sta = NULL;
+	u8 addr[ETH_ALEN];
+	int weight;
+
+	blobmsg_parse(airtime_policy, __UPDATE_AIRTIME_MAX, tb, blob_data(msg), blob_len(msg));
+
+	if (!tb[UPDATE_AIRTIME_WEIGHT])
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	weight = blobmsg_get_u32(tb[UPDATE_AIRTIME_WEIGHT]);
+
+	if (!tb[UPDATE_AIRTIME_STA]) {
+		if (!weight)
+			return UBUS_STATUS_INVALID_ARGUMENT;
+
+		hapd->conf->airtime_weight = weight;
+		return 0;
+	}
+
+	if (hwaddr_aton(blobmsg_data(tb[UPDATE_AIRTIME_STA]), addr))
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	sta = ap_get_sta(hapd, addr);
+	if (!sta)
+		return UBUS_STATUS_NOT_FOUND;
+
+	sta->dyn_airtime_weight = weight;
+	airtime_policy_new_sta(hapd, sta);
+
+	return 0;
+}
+#endif
+
+
 static const struct ubus_method bss_methods[] = {
 	UBUS_METHOD_NOARG("reload", hostapd_bss_reload),
 	UBUS_METHOD_NOARG("get_clients", hostapd_bss_get_clients),
 	UBUS_METHOD_NOARG("get_status", hostapd_bss_get_status),
 	UBUS_METHOD("del_client", hostapd_bss_del_client, del_policy),
+#ifdef CONFIG_AIRTIME_POLICY
+	UBUS_METHOD("update_airtime", hostapd_bss_update_airtime, airtime_policy),
+#endif
 	UBUS_METHOD_NOARG("list_bans", hostapd_bss_list_bans),
 #ifdef CONFIG_WPS
 	UBUS_METHOD_NOARG("wps_start", hostapd_bss_wps_start),