tests/libqos: support multiqueue for virtio-net

Initialize the additional virtqueues if they are supported.
This is needed to switch vhost-user-test's multiqueue test
to the virtio-net qgraph.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

tests/libqos/virtio-net.c

@@ -27,14 +27,19 @@ static QGuestAllocator *alloc;
 
 static void virtio_net_cleanup(QVirtioNet *interface)
 {
-    qvirtqueue_cleanup(interface->vdev->bus, interface->rx, alloc);
-    qvirtqueue_cleanup(interface->vdev->bus, interface->tx, alloc);
+    int i;
+
+    for (i = 0; i < interface->n_queues; i++) {
+        qvirtqueue_cleanup(interface->vdev->bus, interface->queues[i], alloc);
+    }
+    g_free(interface->queues);
 }
 
 static void virtio_net_setup(QVirtioNet *interface)
 {
     QVirtioDevice *vdev = interface->vdev;
     uint64_t features;
+    int i;
 
     features = qvirtio_get_features(vdev);
     features &= ~(QVIRTIO_F_BAD_FEATURE |
@@ -42,8 +47,16 @@ static void virtio_net_setup(QVirtioNet *interface)
                   (1u << VIRTIO_RING_F_EVENT_IDX));
     qvirtio_set_features(vdev, features);
 
-    interface->rx = qvirtqueue_setup(vdev, alloc, 0);
-    interface->tx = qvirtqueue_setup(vdev, alloc, 1);
+    if (features & (1u << VIRTIO_NET_F_MQ)) {
+        interface->n_queues = qvirtio_config_readw(vdev, 8) * 2;
+    } else {
+        interface->n_queues = 2;
+    }
+
+    interface->queues = g_new(QVirtQueue *, interface->n_queues);
+    for (i = 0; i < interface->n_queues; i++) {
+        interface->queues[i] = qvirtqueue_setup(vdev, alloc, i);
+    }
     qvirtio_set_driver_ok(vdev);
 }
 

tests/libqos/virtio-net.h

@@ -26,8 +26,8 @@ typedef struct QVirtioNetDevice QVirtioNetDevice;
 
 struct QVirtioNet {
     QVirtioDevice *vdev;
-    QVirtQueue *rx;
-    QVirtQueue *tx;
+    int n_queues;
+    QVirtQueue **queues;
 };
 
 struct QVirtioNetPCI {

tests/virtio-net-test.c

@@ -136,8 +136,8 @@ static void send_recv_test(void *obj, void *data, QGuestAllocator *t_alloc)
 {
     QVirtioNet *net_if = obj;
     QVirtioDevice *dev = net_if->vdev;
-    QVirtQueue *rx = net_if->rx;
-    QVirtQueue *tx = net_if->tx;
+    QVirtQueue *rx = net_if->queues[0];
+    QVirtQueue *tx = net_if->queues[1];
     int *sv = data;
 
     rx_test(dev, t_alloc, rx, sv[0]);
@@ -148,7 +148,7 @@ static void stop_cont_test(void *obj, void *data, QGuestAllocator *t_alloc)
 {
     QVirtioNet *net_if = obj;
     QVirtioDevice *dev = net_if->vdev;
-    QVirtQueue *rx = net_if->rx;
+    QVirtQueue *rx = net_if->queues[0];
     int *sv = data;
 
     rx_stop_cont_test(dev, t_alloc, rx, sv[0]);