net: disable receiving if client returns zero

If a receiver returns zero, that means its queue is full and it will
notify us when room is available using qemu_flush_queued_packets().

Take note of that and disable that receiver until it flushes its queue.

This is a first step towards allowing can_receive() handlers to return
true even if no buffer space is available.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/net.h b/net.h
index 338d84ad67..4ffce9109b 100644
--- a/net.h
+++ b/net.h
@@ -61,6 +61,7 @@ struct VLANClientState {
     char *model;
     char *name;
     char info_str[256];
+    unsigned receive_disabled : 1;
 };
 
 struct VLANState {