C++ (Cpp) virtio_is_big_endianの例

コード例 #1

ファイル: vhost_net.c プロジェクト: C2Devel/qemu-kvm

static int vhost_net_set_vnet_endian(VirtIODevice *dev, NetClientState *peer,
                                     bool set)
{
    int r = 0;

    if (virtio_vdev_has_feature(dev, VIRTIO_F_VERSION_1) ||
        (virtio_legacy_is_cross_endian(dev) && !virtio_is_big_endian(dev))) {
        r = qemu_set_vnet_le(peer, set);
        if (r) {
            error_report("backend does not support LE vnet headers");
        }
    } else if (virtio_legacy_is_cross_endian(dev)) {
        r = qemu_set_vnet_be(peer, set);
        if (r) {
            error_report("backend does not support BE vnet headers");
        }
    }

    return r;
}

コード例 #2

ファイル: vhost_net.c プロジェクト: AlexHai/qemu

static void vhost_net_stop_one(struct vhost_net *net,
                               VirtIODevice *dev)
{
    struct vhost_vring_file file = { .fd = -1 };

    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
        for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
            const VhostOps *vhost_ops = net->dev.vhost_ops;
            int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
                                          &file);
            assert(r >= 0);
        }
    }
    if (net->nc->info->poll) {
        net->nc->info->poll(net->nc, true);
    }
    vhost_dev_stop(&net->dev, dev);
    vhost_dev_disable_notifiers(&net->dev, dev);
}

static bool vhost_net_device_endian_ok(VirtIODevice *vdev)
{
#ifdef TARGET_IS_BIENDIAN
#ifdef HOST_WORDS_BIGENDIAN
    return virtio_is_big_endian(vdev);
#else
    return !virtio_is_big_endian(vdev);
#endif
#else
    return true;
#endif
}

int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
                    int total_queues)
{
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
    VirtioBusState *vbus = VIRTIO_BUS(qbus);
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
    int r, e, i;

    if (!vhost_net_device_endian_ok(dev)) {
        error_report("vhost-net does not support cross-endian");
        r = -ENOSYS;
        goto err;
    }

    if (!k->set_guest_notifiers) {
        error_report("binding does not support guest notifiers");
        r = -ENOSYS;
        goto err;
    }

    for (i = 0; i < total_queues; i++) {
        vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
    }

    r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
    if (r < 0) {
        error_report("Error binding guest notifier: %d", -r);
        goto err;
    }

    for (i = 0; i < total_queues; i++) {
        r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);

        if (r < 0) {
            goto err_start;
        }
    }

    return 0;

err_start:
    while (--i >= 0) {
        vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
    }
    e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
    if (e < 0) {
        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
        fflush(stderr);
    }
err:
    return r;
}