tests/libqos: virtio-net driver and interface nodes

Add qgraph nodes for virtio-net-pci and virtio-net-device.
Both nodes produce virtio-net, but virtio-net-pci receives
a pci-bus and overrides virtio-pci QOSGraphObject and its functions,
while virtio-net-device receives a virtio and implements
its own functions

Signed-off-by: Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/Makefile.include

@@ -743,6 +743,7 @@ qos-test-obj-y += $(libqos-virtio-obj-y)
 qos-test-obj-$(CONFIG_VIRTFS) += tests/libqos/virtio-9p.o
 qos-test-obj-y += tests/libqos/virtio-balloon.o
 qos-test-obj-y += tests/libqos/virtio-blk.o
+qos-test-obj-y += tests/libqos/virtio-net.o
 qos-test-obj-y += tests/libqos/virtio-rng.o
 qos-test-obj-y += tests/libqos/virtio-serial.o
 

tests/libqos/virtio-net.c

@@ -0,0 +1,182 @@
+/*
+ * libqos driver framework
+ *
+ * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+#include "libqos/qgraph.h"
+#include "libqos/virtio-net.h"
+#include "hw/virtio/virtio-net.h"
+
+
+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);
+}
+
+static void virtio_net_setup(QVirtioNet *interface)
+{
+    QVirtioDevice *vdev = interface->vdev;
+    uint64_t features;
+
+    features = qvirtio_get_features(vdev);
+    features &= ~(QVIRTIO_F_BAD_FEATURE |
+                  (1u << VIRTIO_RING_F_INDIRECT_DESC) |
+                  (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);
+    qvirtio_set_driver_ok(vdev);
+}
+
+/* virtio-net-device */
+static void qvirtio_net_device_destructor(QOSGraphObject *obj)
+{
+    QVirtioNetDevice *v_net = (QVirtioNetDevice *) obj;
+    virtio_net_cleanup(&v_net->net);
+}
+
+static void qvirtio_net_device_start_hw(QOSGraphObject *obj)
+{
+    QVirtioNetDevice *v_net = (QVirtioNetDevice *) obj;
+    QVirtioNet *interface = &v_net->net;
+
+    virtio_net_setup(interface);
+}
+
+static void *qvirtio_net_get_driver(QVirtioNet *v_net,
+                                    const char *interface)
+{
+    if (!g_strcmp0(interface, "virtio-net")) {
+        return v_net;
+    }
+    if (!g_strcmp0(interface, "virtio")) {
+        return v_net->vdev;
+    }
+
+    fprintf(stderr, "%s not present in virtio-net-device\n", interface);
+    g_assert_not_reached();
+}
+
+static void *qvirtio_net_device_get_driver(void *object,
+                                           const char *interface)
+{
+    QVirtioNetDevice *v_net = object;
+    return qvirtio_net_get_driver(&v_net->net, interface);
+}
+
+static void *virtio_net_device_create(void *virtio_dev,
+                                          QGuestAllocator *t_alloc,
+                                          void *addr)
+{
+    QVirtioNetDevice *virtio_ndevice = g_new0(QVirtioNetDevice, 1);
+    QVirtioNet *interface = &virtio_ndevice->net;
+
+    interface->vdev = virtio_dev;
+    alloc = t_alloc;
+
+    virtio_ndevice->obj.destructor = qvirtio_net_device_destructor;
+    virtio_ndevice->obj.get_driver = qvirtio_net_device_get_driver;
+    virtio_ndevice->obj.start_hw = qvirtio_net_device_start_hw;
+
+    return &virtio_ndevice->obj;
+}
+
+/* virtio-net-pci */
+static void qvirtio_net_pci_destructor(QOSGraphObject *obj)
+{
+    QVirtioNetPCI *v_net = (QVirtioNetPCI *) obj;
+    QVirtioNet *interface = &v_net->net;
+    QOSGraphObject *pci_vobj =  &v_net->pci_vdev.obj;
+
+    virtio_net_cleanup(interface);
+    qvirtio_pci_destructor(pci_vobj);
+}
+
+static void qvirtio_net_pci_start_hw(QOSGraphObject *obj)
+{
+    QVirtioNetPCI *v_net = (QVirtioNetPCI *) obj;
+    QVirtioNet *interface = &v_net->net;
+    QOSGraphObject *pci_vobj =  &v_net->pci_vdev.obj;
+
+    qvirtio_pci_start_hw(pci_vobj);
+    virtio_net_setup(interface);
+}
+
+static void *qvirtio_net_pci_get_driver(void *object,
+                                            const char *interface)
+{
+    QVirtioNetPCI *v_net = object;
+    if (!g_strcmp0(interface, "pci-device")) {
+        return v_net->pci_vdev.pdev;
+    }
+    return qvirtio_net_get_driver(&v_net->net, interface);
+}
+
+static void *virtio_net_pci_create(void *pci_bus, QGuestAllocator *t_alloc,
+                                  void *addr)
+{
+    QVirtioNetPCI *virtio_bpci = g_new0(QVirtioNetPCI, 1);
+    QVirtioNet *interface = &virtio_bpci->net;
+    QOSGraphObject *obj = &virtio_bpci->pci_vdev.obj;
+
+    virtio_pci_init(&virtio_bpci->pci_vdev, pci_bus, addr);
+    interface->vdev = &virtio_bpci->pci_vdev.vdev;
+    alloc = t_alloc;
+
+    g_assert_cmphex(interface->vdev->device_type, ==, VIRTIO_ID_NET);
+
+    obj->destructor = qvirtio_net_pci_destructor;
+    obj->start_hw = qvirtio_net_pci_start_hw;
+    obj->get_driver = qvirtio_net_pci_get_driver;
+
+    return obj;
+}
+
+static void virtio_net_register_nodes(void)
+{
+    /* FIXME: every test using these nodes needs to setup a
+     * -netdev socket,id=hs0 otherwise QEMU is not going to start.
+     * Therefore, we do not include "produces" edge for virtio
+     * and pci-device yet.
+     */
+    QPCIAddress addr = {
+        .devfn = QPCI_DEVFN(4, 0),
+    };
+
+    QOSGraphEdgeOptions opts = { };
+
+    /* virtio-net-device */
+    opts.extra_device_opts = "netdev=hs0";
+    qos_node_create_driver("virtio-net-device",
+                            virtio_net_device_create);
+    qos_node_consumes("virtio-net-device", "virtio-bus", &opts);
+    qos_node_produces("virtio-net-device", "virtio-net");
+
+    /* virtio-net-pci */
+    opts.extra_device_opts = "netdev=hs0,addr=04.0";
+    add_qpci_address(&opts, &addr);
+    qos_node_create_driver("virtio-net-pci", virtio_net_pci_create);
+    qos_node_consumes("virtio-net-pci", "pci-bus", &opts);
+    qos_node_produces("virtio-net-pci", "virtio-net");
+}
+
+libqos_init(virtio_net_register_nodes);

tests/libqos/virtio-net.h

@@ -0,0 +1,41 @@
+/*
+ * libqos driver framework
+ *
+ * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "libqos/qgraph.h"
+#include "libqos/virtio.h"
+#include "libqos/virtio-pci.h"
+
+typedef struct QVirtioNet QVirtioNet;
+typedef struct QVirtioNetPCI QVirtioNetPCI;
+typedef struct QVirtioNetDevice QVirtioNetDevice;
+
+struct QVirtioNet {
+    QVirtioDevice *vdev;
+    QVirtQueue *rx;
+    QVirtQueue *tx;
+};
+
+struct QVirtioNetPCI {
+    QVirtioPCIDevice pci_vdev;
+    QVirtioNet net;
+};
+
+struct QVirtioNetDevice {
+    QOSGraphObject obj;
+    QVirtioNet net;
+};

tests/libqos/virtio.c

@@ -40,6 +40,7 @@ uint32_t qvirtio_get_features(QVirtioDevice *d)
 
 void qvirtio_set_features(QVirtioDevice *d, uint32_t features)
 {
+    d->features = features;
     d->bus->set_features(d, features);
 }
 

tests/libqos/virtio.h

@@ -21,6 +21,7 @@ typedef struct QVirtioDevice {
     const QVirtioBus *bus;
     /* Device type */
     uint16_t device_type;
+    uint64_t features;
     bool big_endian;
 } QVirtioDevice;