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[Qemu-devel] [PATCH 2/2] net: fix qemu_can_send_packet logic

From: Vincent Palatin
Subject: [Qemu-devel] [PATCH 2/2] net: fix qemu_can_send_packet logic
Date: Wed, 2 Mar 2011 17:25:02 -0500

If any of the clients is not ready to receive (ie it has a can_receive
callback and can_receive() returns false), we don't want to start
sending, else this client may miss/discard the packet.

I got this behaviour with the following setup :
the emulated machine is using an USB-ethernet adapter, it is connected
to the network using SLIRP and I'm dumping the traffic in a .pcap file.
As per the following command line :
-net nic,model=usb,vlan=1 -net user,vlan=1 -net dump,vlan=1,file=/tmp/pkt.pcap
Every time that two packets are coming in a row from the host, the
usb-net code will receive the first one, then returns 0 to can_receive
call since it has a 1 packet long queue. But as the dump code is always
ready to receive, qemu_can_send_packet will return true and the next
packet will discard the previous one in the usb-net code.

Signed-off-by: Vincent Palatin <address@hidden>
 net.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net.c b/net.c
index ec4745d..72ac4cf 100644
--- a/net.c
+++ b/net.c
@@ -411,11 +411,11 @@ int qemu_can_send_packet(VLANClientState *sender)
         /* no can_receive() handler, they can always receive */
-        if (!vc->info->can_receive || vc->info->can_receive(vc)) {
-            return 1;
+        if (vc->info->can_receive && !vc->info->can_receive(vc)) {
+            return 0;
-    return 0;
+    return 1;
 static ssize_t qemu_deliver_packet(VLANClientState *sender,

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