net: invoke callback when purging queue

devices rely on packet callbacks eventually running,
but we violate this rule whenever we purge the queue.
To fix, invoke callbacks on all packets on purge.
Set length to 0, this way callers can detect that
this happened and re-queue if necessary.

Cc: qemu-stable@nongnu.org
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/queue.c b/net/queue.c
index 859d02a136..f948318718 100644
--- a/net/queue.c
+++ b/net/queue.c
@@ -233,6 +233,9 @@ void qemu_net_queue_purge(NetQueue *queue, NetClientState *from)
         if (packet->sender == from) {
             QTAILQ_REMOVE(&queue->packets, packet, entry);
             queue->nq_count--;
+            if (packet->sent_cb) {
+                packet->sent_cb(packet->sender, 0);
+            }
             g_free(packet);
         }
     }