qcacmn: Add CDP API to save low latency connection count

The 11g and 11a connections are latency critical and
hence the tx coalescing cannot be applied on traffic
running for these connections.

Add a CDP API to save the number of low latency
connection in the dtapath vdev handle. The Software
latency manager can use this information to decide
and skip the tx register write coalescing for packet
transmission on low latency connections.

Change-Id: Iff51867447e9d4537a3637cb65d94e184e4249ef
CRs-Fixed: 2769025

dp/wifi3.0/dp_main.c

@@ -9800,6 +9800,46 @@ dp_vdev_set_dp_ext_handle(ol_txrx_soc_handle soc_hdl, uint8_t vdev_id,
 	return QDF_STATUS_SUCCESS;
 }
 
+/**
+ * dp_vdev_inform_ll_conn() - Inform vdev to add/delete a latency critical
+ *			      connection for this vdev
+ * @soc_hdl: CDP soc handle
+ * @vdev_id: vdev ID
+ * @action: Add/Delete action
+ *
+ * Returns: QDF_STATUS.
+ */
+static QDF_STATUS
+dp_vdev_inform_ll_conn(struct cdp_soc_t *soc_hdl, uint8_t vdev_id,
+		       enum vdev_ll_conn_actions action)
+{
+	struct dp_soc *soc = cdp_soc_t_to_dp_soc(soc_hdl);
+	struct dp_vdev *vdev = dp_vdev_get_ref_by_id(soc, vdev_id,
+						     DP_MOD_ID_CDP);
+
+	if (!vdev) {
+		dp_err("LL connection action for invalid vdev %d", vdev_id);
+		return QDF_STATUS_E_FAILURE;
+	}
+
+	switch (action) {
+	case CDP_VDEV_LL_CONN_ADD:
+		vdev->num_latency_critical_conn++;
+		break;
+
+	case CDP_VDEV_LL_CONN_DEL:
+		vdev->num_latency_critical_conn--;
+		break;
+
+	default:
+		dp_err("LL connection action invalid %d", action);
+		break;
+	}
+
+	dp_vdev_unref_delete(soc, vdev, DP_MOD_ID_CDP);
+	return QDF_STATUS_SUCCESS;
+}
+
 /**
  * dp_soc_get_dp_txrx_handle() - get context for external-dp from dp soc
  * @soc_handle: datapath soc handle
@@ -11168,6 +11208,7 @@ static struct cdp_misc_ops dp_ops_misc = {
 	.txrx_ext_stats_request = dp_txrx_ext_stats_request,
 	.request_rx_hw_stats = dp_request_rx_hw_stats,
 #endif /* WLAN_FEATURE_STATS_EXT */
+	.vdev_inform_ll_conn = dp_vdev_inform_ll_conn,
 };
 #endif