tap: forbid creating multiqueue tap when hub is used

[qemu.git] / net / tap.c

diff --git a/net/tap.c b/net/tap.c
index 48c254ed856965fd078301fdb8631648b15de1f9..daab350efcd3b5966039a50da940e6e7985ab6b5 100644 (file)
--- a/net/tap.c
+++ b/net/tap.c
@@ -693,6 +693,13 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
     queues = tap->has_queues ? tap->queues : 1;
     vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;
 
+    /* QEMU vlans does not support multiqueue tap, in this case peer is set.
+     * For -netdev, peer is always NULL. */
+    if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) {
+        error_report("Multiqueue tap cannnot be used with QEMU vlans");
+        return -1;
+    }
+
     if (tap->has_fd) {
         if (tap->has_ifname || tap->has_script || tap->has_downscript ||
             tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||