libqos: Added EVENT_IDX support

Added avail_event and NO_NOTIFY check before notifying.
Added used_event setting.

Signed-off-by: Marc Marí <marc.mari.barcelo@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

tests/libqos/virtio-pci.c

@@ -203,6 +203,7 @@ static QVirtQueue *qvirtio_pci_virtqueue_setup(QVirtioDevice *d,
     vqpci->vq.num_free = vqpci->vq.size;
     vqpci->vq.align = QVIRTIO_PCI_ALIGN;
     vqpci->vq.indirect = (feat & QVIRTIO_F_RING_INDIRECT_DESC) != 0;
+    vqpci->vq.event = (feat & QVIRTIO_F_RING_EVENT_IDX) != 0;
 
     vqpci->msix_entry = -1;
     vqpci->msix_addr = 0;

tests/libqos/virtio.c

@@ -124,9 +124,13 @@ void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr)
     writew(vq->avail, 0);
     /* vq->avail->idx */
     writew(vq->avail + 2, 0);
+    /* vq->avail->used_event */
+    writew(vq->avail + 4 + (2 * vq->size), 0);
 
     /* vq->used->flags */
     writew(vq->used, 0);
+    /* vq->used->avail_event */
+    writew(vq->used+2+(sizeof(struct QVRingUsedElem)*vq->size), 0);
 }
 
 QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
@@ -222,11 +226,32 @@ void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
 {
     /* vq->avail->idx */
     uint16_t idx = readl(vq->avail + 2);
+    /* vq->used->flags */
+    uint16_t flags;
+    /* vq->used->avail_event */
+    uint16_t avail_event;
 
     /* vq->avail->ring[idx % vq->size] */
     writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
     /* vq->avail->idx */
     writel(vq->avail + 2, idx + 1);
 
+    /* Must read after idx is updated */
+    flags = readw(vq->avail);
+    avail_event = readw(vq->used + 4 +
+                                (sizeof(struct QVRingUsedElem) * vq->size));
+
+    /* < 1 because we add elements to avail queue one by one */
+    if ((flags & QVRING_USED_F_NO_NOTIFY) == 0 &&
+                            (!vq->event || (uint16_t)(idx-avail_event) < 1)) {
         bus->virtqueue_kick(d, vq);
+    }
+}
+
+void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx)
+{
+    g_assert(vq->event);
+
+    /* vq->avail->used_event */
+    writew(vq->avail + 4 + (2 * vq->size), idx);
 }

tests/libqos/virtio.h

@@ -26,6 +26,7 @@
 #define QVIRTIO_F_ANY_LAYOUT            0x08000000
 #define QVIRTIO_F_RING_INDIRECT_DESC    0x10000000
 #define QVIRTIO_F_RING_EVENT_IDX        0x20000000
+#define QVIRTIO_F_BAD_FEATURE           0x40000000
 
 #define QVRING_DESC_F_NEXT      0x1
 #define QVRING_DESC_F_WRITE     0x2
@@ -57,6 +58,7 @@ typedef struct QVRingAvail {
     uint16_t flags;
     uint16_t idx;
     uint16_t ring[0]; /* This is an array of uint16_t */
+    uint16_t used_event;
 } QVRingAvail;
 
 typedef struct QVRingUsedElem {
@@ -68,6 +70,7 @@ typedef struct QVRingUsed {
     uint16_t flags;
     uint16_t idx;
     QVRingUsedElem ring[0]; /* This is an array of QVRingUsedElem structs */
+    uint16_t avail_event;
 } QVRingUsed;
 
 typedef struct QVirtQueue {
@@ -80,6 +83,7 @@ typedef struct QVirtQueue {
     uint32_t num_free;
     uint32_t align;
     bool indirect;
+    bool event;
 } QVirtQueue;
 
 typedef struct QVRingIndirectDesc {
@@ -174,4 +178,5 @@ uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect);
 void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
                                                             uint32_t free_head);
 
+void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx);
 #endif

tests/virtio-blk-test.c

@@ -496,6 +496,129 @@ static void pci_msix(void)
 
     qvirtqueue_kick(&qvirtio_pci, &dev->vdev, &vqpci->vq, free_head);
 
+
+    g_assert(qvirtio_wait_queue_isr(&qvirtio_pci, &dev->vdev, &vqpci->vq,
+                                                        QVIRTIO_BLK_TIMEOUT));
+
+    status = readb(req_addr + 528);
+    g_assert_cmpint(status, ==, 0);
+
+    data = g_malloc0(512);
+    memread(req_addr + 16, data, 512);
+    g_assert_cmpstr(data, ==, "TEST");
+    g_free(data);
+
+    guest_free(alloc, req_addr);
+
+    /* End test */
+    guest_free(alloc, (uint64_t)vqpci->vq.desc);
+    qpci_msix_disable(dev->pdev);
+    qvirtio_pci_device_disable(dev);
+    g_free(dev);
+    test_end();
+}
+
+static void pci_idx(void)
+{
+    QVirtioPCIDevice *dev;
+    QPCIBus *bus;
+    QVirtQueuePCI *vqpci;
+    QGuestAllocator *alloc;
+    QVirtioBlkReq req;
+    void *addr;
+    uint64_t req_addr;
+    uint64_t capacity;
+    uint32_t features;
+    uint32_t free_head;
+    uint8_t status;
+    char *data;
+
+    bus = test_start();
+    alloc = pc_alloc_init();
+
+    dev = virtio_blk_init(bus);
+    qpci_msix_enable(dev->pdev);
+
+    qvirtio_pci_set_msix_configuration_vector(dev, alloc, 0);
+
+    /* MSI-X is enabled */
+    addr = dev->addr + QVIRTIO_DEVICE_SPECIFIC_MSIX;
+
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
+
+    features = qvirtio_get_features(&qvirtio_pci, &dev->vdev);
+    features = features & ~(QVIRTIO_F_BAD_FEATURE |
+                            QVIRTIO_F_RING_INDIRECT_DESC |
+                            QVIRTIO_F_NOTIFY_ON_EMPTY | QVIRTIO_BLK_F_SCSI);
+    qvirtio_set_features(&qvirtio_pci, &dev->vdev, features);
+
+    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&qvirtio_pci, &dev->vdev,
+                                                                    alloc, 0);
+    qvirtqueue_pci_msix_setup(dev, vqpci, alloc, 1);
+
+    qvirtio_set_driver_ok(&qvirtio_pci, &dev->vdev);
+
+    /* Write request */
+    req.type = QVIRTIO_BLK_T_OUT;
+    req.ioprio = 1;
+    req.sector = 0;
+    req.data = g_malloc0(512);
+    strcpy(req.data, "TEST");
+
+    req_addr = virtio_blk_request(alloc, &req, 512);
+
+    g_free(req.data);
+
+    free_head = qvirtqueue_add(&vqpci->vq, req_addr, 528, false, true);
+    qvirtqueue_add(&vqpci->vq, req_addr + 528, 1, true, false);
+    qvirtqueue_kick(&qvirtio_pci, &dev->vdev, &vqpci->vq, free_head);
+
+    g_assert(qvirtio_wait_queue_isr(&qvirtio_pci, &dev->vdev, &vqpci->vq,
+                                                        QVIRTIO_BLK_TIMEOUT));
+
+    /* Write request */
+    req.type = QVIRTIO_BLK_T_OUT;
+    req.ioprio = 1;
+    req.sector = 1;
+    req.data = g_malloc0(512);
+    strcpy(req.data, "TEST");
+
+    req_addr = virtio_blk_request(alloc, &req, 512);
+
+    g_free(req.data);
+
+    /* Notify after processing the third request */
+    qvirtqueue_set_used_event(&vqpci->vq, 2);
+    free_head = qvirtqueue_add(&vqpci->vq, req_addr, 528, false, true);
+    qvirtqueue_add(&vqpci->vq, req_addr + 528, 1, true, false);
+    qvirtqueue_kick(&qvirtio_pci, &dev->vdev, &vqpci->vq, free_head);
+
+    /* No notification expected */
+    g_assert(!qvirtio_wait_queue_isr(&qvirtio_pci, &dev->vdev, &vqpci->vq,
+                                                        QVIRTIO_BLK_TIMEOUT));
+
+    status = readb(req_addr + 528);
+    g_assert_cmpint(status, ==, 0);
+
+    guest_free(alloc, req_addr);
+
+    /* Read request */
+    req.type = QVIRTIO_BLK_T_IN;
+    req.ioprio = 1;
+    req.sector = 1;
+    req.data = g_malloc0(512);
+
+    req_addr = virtio_blk_request(alloc, &req, 512);
+
+    g_free(req.data);
+
+    free_head = qvirtqueue_add(&vqpci->vq, req_addr, 16, false, true);
+    qvirtqueue_add(&vqpci->vq, req_addr + 16, 513, true, false);
+
+    qvirtqueue_kick(&qvirtio_pci, &dev->vdev, &vqpci->vq, free_head);
+
+
     g_assert(qvirtio_wait_queue_isr(&qvirtio_pci, &dev->vdev, &vqpci->vq,
                                                         QVIRTIO_BLK_TIMEOUT));
 
@@ -527,6 +650,7 @@ int main(int argc, char **argv)
     g_test_add_func("/virtio/blk/pci/indirect", pci_indirect);
     g_test_add_func("/virtio/blk/pci/config", pci_config);
     g_test_add_func("/virtio/blk/pci/msix", pci_msix);
+    g_test_add_func("/virtio/blk/pci/idx", pci_idx);
 
     ret = g_test_run();