net: add packet length to NetPacketSent callback

virtio-net needs this - for the same purpose that it currently uses the
return value from qemu_sendv_packet().
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

net.c

@@ -472,7 +472,7 @@ void qemu_flush_queued_packets(VLANClientState *vc)
         }
 
         if (packet->sent_cb)
-            packet->sent_cb(packet->sender);
+            packet->sent_cb(packet->sender, ret);
 
         qemu_free(packet);
     }
@@ -1138,7 +1138,7 @@ static ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
 }
 #endif
 
-static void tap_send_completed(VLANClientState *vc)
+static void tap_send_completed(VLANClientState *vc, ssize_t len)
 {
     TAPState *s = vc->opaque;
     tap_read_poll(s, 1);

net.h

@@ -32,7 +32,7 @@ struct VLANClientState {
 
 typedef struct VLANPacket VLANPacket;
 
-typedef void (NetPacketSent) (VLANClientState *);
+typedef void (NetPacketSent) (VLANClientState *, ssize_t);
 
 struct VLANPacket {
     struct VLANPacket *next;