纸糊忙等tcp connecting，尚不明确连接可用的机制。

kernel/src/driver/net/mod.rs

@@ -246,8 +246,8 @@ impl IfaceCommon {
 
         self.bounds.read().iter().for_each(|bound_socket| {
             // incase our inet socket missed the event, we manually notify it each time we poll
-            bound_socket.on_iface_events();
             if has_events {
+                bound_socket.on_iface_events();
                 bound_socket
                     .wait_queue()
                     .wakeup(Some(ProcessState::Blocked(true)));

kernel/src/driver/net/virtio_net.rs

@@ -645,6 +645,7 @@ impl Iface for VirtioInterface {
     }
 
     fn poll(&self) {
+        // log::debug!("VirtioInterface: poll");
         self.iface_common.poll(self.device_inner.force_get_mut())
     }