From a7b6477718a2eac865f83cb6d1757d1d121627b9 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 9 Aug 2012 16:45:57 +0200
Subject: [PATCH] xen: flush queue when getting an event

xen does not have a register that, when written, will cause can_receive
to go from false to true.  However, flushing the queue can be attempted
whenever the front-end raises its side of the Xen event channel.  There
is a single event channel for tx and rx.

Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit a98b140223d3a627eab7ee3ddec645bab630d756)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/xen_nic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/xen_nic.c b/hw/xen_nic.c
index 8b79bfb..cf7d559 100644
--- a/hw/xen_nic.c
+++ b/hw/xen_nic.c
@@ -415,6 +415,7 @@ static void net_event(struct XenDevice *xendev)
 {
     struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
     net_tx_packets(netdev);
+    qemu_flush_queued_packets(&netdev->nic->nc);
 }
 
 static int net_free(struct XenDevice *xendev)