[PULL 17/31] tests/qtest: add multi-queue test case to vhost-user-blk-test

[Kevin Wolf <kwolf@redhat.com>]

From: Stefan Hajnoczi <stefanha@redhat.com>

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20210223144653.811468-7-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 tests/qtest/vhost-user-blk-test.c | 81 +++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 5 deletions(-)

diff --git a/tests/qtest/vhost-user-blk-test.c b/tests/qtest/vhost-user-blk-test.c
index f0fb09893e..61beee52d3 100644
--- a/tests/qtest/vhost-user-blk-test.c
+++ b/tests/qtest/vhost-user-blk-test.c
@@ -563,6 +563,67 @@ static void pci_hotplug(void *obj, void *data, QGuestAllocator *t_alloc)
     qpci_unplug_acpi_device_test(qts, "drv1", PCI_SLOT_HP);
 }
 
+static void multiqueue(void *obj, void *data, QGuestAllocator *t_alloc)
+{
+    QVirtioPCIDevice *pdev1 = obj;
+    QVirtioDevice *dev1 = &pdev1->vdev;
+    QVirtioPCIDevice *pdev8;
+    QVirtioDevice *dev8;
+    QTestState *qts = pdev1->pdev->bus->qts;
+    uint64_t features;
+    uint16_t num_queues;
+
+    /*
+     * The primary device has 1 queue and VIRTIO_BLK_F_MQ is not enabled. The
+     * VIRTIO specification allows VIRTIO_BLK_F_MQ to be enabled when there is
+     * only 1 virtqueue, but --device vhost-user-blk-pci doesn't do this (which
+     * is also spec-compliant).
+     */
+    features = qvirtio_get_features(dev1);
+    g_assert_cmpint(features & (1u << VIRTIO_BLK_F_MQ), ==, 0);
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                            (1u << VIRTIO_RING_F_INDIRECT_DESC) |
+                            (1u << VIRTIO_F_NOTIFY_ON_EMPTY) |
+                            (1u << VIRTIO_BLK_F_SCSI));
+    qvirtio_set_features(dev1, features);
+
+    /* Hotplug a secondary device with 8 queues */
+    qtest_qmp_device_add(qts, "vhost-user-blk-pci", "drv1",
+                         "{'addr': %s, 'chardev': 'char2', 'num-queues': 8}",
+                         stringify(PCI_SLOT_HP) ".0");
+
+    pdev8 = virtio_pci_new(pdev1->pdev->bus,
+                           &(QPCIAddress) {
+                               .devfn = QPCI_DEVFN(PCI_SLOT_HP, 0)
+                           });
+    g_assert_nonnull(pdev8);
+    g_assert_cmpint(pdev8->vdev.device_type, ==, VIRTIO_ID_BLOCK);
+
+    qos_object_start_hw(&pdev8->obj);
+
+    dev8 = &pdev8->vdev;
+    features = qvirtio_get_features(dev8);
+    g_assert_cmpint(features & (1u << VIRTIO_BLK_F_MQ),
+                    ==,
+                    (1u << VIRTIO_BLK_F_MQ));
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                            (1u << VIRTIO_RING_F_INDIRECT_DESC) |
+                            (1u << VIRTIO_F_NOTIFY_ON_EMPTY) |
+                            (1u << VIRTIO_BLK_F_SCSI) |
+                            (1u << VIRTIO_BLK_F_MQ));
+    qvirtio_set_features(dev8, features);
+
+    num_queues = qvirtio_config_readw(dev8,
+            offsetof(struct virtio_blk_config, num_queues));
+    g_assert_cmpint(num_queues, ==, 8);
+
+    qvirtio_pci_device_disable(pdev8);
+    qos_object_destroy(&pdev8->obj);
+
+    /* unplug secondary disk */
+    qpci_unplug_acpi_device_test(qts, "drv1", PCI_SLOT_HP);
+}
+
 /*
  * Check that setting the vring addr on a non-existent virtqueue does
  * not crash.
@@ -682,7 +743,8 @@ static void quit_storage_daemon(void *data)
     g_free(data);
 }
 
-static void start_vhost_user_blk(GString *cmd_line, int vus_instances)
+static void start_vhost_user_blk(GString *cmd_line, int vus_instances,
+                                 int num_queues)
 {
     const char *vhost_user_blk_bin = qtest_qemu_storage_daemon_binary();
     int i;
@@ -707,8 +769,8 @@ static void start_vhost_user_blk(GString *cmd_line, int vus_instances)
         g_string_append_printf(storage_daemon_command,
             "--blockdev driver=file,node-name=disk%d,filename=%s "
             "--export type=vhost-user-blk,id=disk%d,addr.type=unix,addr.path=%s,"
-            "node-name=disk%i,writable=on ",
-            i, img_path, i, sock_path, i);
+            "node-name=disk%i,writable=on,num-queues=%d ",
+            i, img_path, i, sock_path, i, num_queues);
 
         g_string_append_printf(cmd_line, "-chardev socket,id=char%d,path=%s ",
                                i + 1, sock_path);
@@ -742,7 +804,7 @@ static void start_vhost_user_blk(GString *cmd_line, int vus_instances)
 
 static void *vhost_user_blk_test_setup(GString *cmd_line, void *arg)
 {
-    start_vhost_user_blk(cmd_line, 1);
+    start_vhost_user_blk(cmd_line, 1, 1);
     return arg;
 }
 
@@ -756,7 +818,13 @@ static void *vhost_user_blk_test_setup(GString *cmd_line, void *arg)
 static void *vhost_user_blk_hotplug_test_setup(GString *cmd_line, void *arg)
 {
     /* "-chardev socket,id=char2" is used for pci_hotplug*/
-    start_vhost_user_blk(cmd_line, 2);
+    start_vhost_user_blk(cmd_line, 2, 1);
+    return arg;
+}
+
+static void *vhost_user_blk_multiqueue_test_setup(GString *cmd_line, void *arg)
+{
+    start_vhost_user_blk(cmd_line, 2, 8);
     return arg;
 }
 
@@ -783,6 +851,9 @@ static void register_vhost_user_blk_test(void)
 
     opts.before = vhost_user_blk_hotplug_test_setup;
     qos_add_test("hotplug", "vhost-user-blk-pci", pci_hotplug, &opts);
+
+    opts.before = vhost_user_blk_multiqueue_test_setup;
+    qos_add_test("multiqueue", "vhost-user-blk-pci", multiqueue, &opts);
 }
 
 libqos_init(register_vhost_user_blk_test);
-- 
2.29.2