Re: [Qemu-devel] [PATCH v4 04/10] virtio-scsi: add the virtio-scsi device.

[Cornelia Huck <cornelia.huck@de.ibm.com>]

On Wed, 20 Mar 2013 15:07:37 +0100
fred.konrad@greensocs.com wrote:

> From: KONRAD Frederic <fred.konrad@greensocs.com>
> 
> Create virtio-scsi which extends virtio-device, so it can be connected on
> virtio-bus.
> 
> Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
> ---
>  hw/virtio-scsi.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
>  hw/virtio-scsi.h |  5 ++++
>  2 files changed, 85 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
> index 08fcb80..ca9ceb1 100644
> --- a/hw/virtio-scsi.c
> +++ b/hw/virtio-scsi.c
> @@ -17,6 +17,7 @@
>  #include "qemu/error-report.h"
>  #include <hw/scsi.h>
>  #include <hw/scsi-defs.h>
> +#include "hw/virtio-bus.h"
> 
>  #define VIRTIO_SCSI_VQ_SIZE     128
>  #define VIRTIO_SCSI_CDB_SIZE    32
> @@ -686,15 +687,30 @@ static struct SCSIBusInfo virtio_scsi_scsi_info = {
>      .load_request = virtio_scsi_load_request,
>  };
> 
> -VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
> +static VirtIODevice *virtio_scsi_common_init(DeviceState *dev,
> +                                             VirtIOSCSIConf *proxyconf,
> +                                             VirtIOSCSI **ps)
>  {
> -    VirtIOSCSI *s;
> +    VirtIOSCSI *s = *ps;
>      static int virtio_scsi_id;
>      int i;
> 
> -    s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
> -                                         sizeof(VirtIOSCSIConfig),
> -                                         sizeof(VirtIOSCSI));
> +    /*
> +     * We have two cases here: the old virtio-net-pci device, and the
> +     * refactored virtio-net.

Confusing comment: Neither is this dealing with virtio-net, nor do we
have only virtio-net-pci :)

> +     */
> +
> +    if (s == NULL) {
> +        /* virtio-scsi-pci */
> +        s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
> +                                             sizeof(VirtIOSCSIConfig),
> +                                             sizeof(VirtIOSCSI));
> +    } else {
> +        /* virtio-scsi */
> +        virtio_init(VIRTIO_DEVICE(s), "virtio-scsi", VIRTIO_ID_SCSI,
> +                    sizeof(VirtIOSCSIConfig));
> +    }
> +
>      s->cmd_vqs = g_malloc0(proxyconf->num_queues * sizeof(VirtQueue *));
> 
>      s->qdev = dev;
> @@ -726,6 +742,12 @@ VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
>      return &s->vdev;
>  }
> 
> +VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
> +{
> +    VirtIOSCSI *s = NULL;
> +    return virtio_scsi_common_init(dev, proxyconf, &s);
> +}
> +
>  void virtio_scsi_exit(VirtIODevice *vdev)
>  {
>      VirtIOSCSI *s = (VirtIOSCSI *)vdev;
> @@ -733,3 +755,56 @@ void virtio_scsi_exit(VirtIODevice *vdev)
>      g_free(s->cmd_vqs);
>      virtio_cleanup(vdev);
>  }
> +
> +static int virtio_scsi_device_init(VirtIODevice *vdev)
> +{
> +    DeviceState *qdev = DEVICE(vdev);
> +    VirtIOSCSI *s = VIRTIO_SCSI(vdev);
> +    if (virtio_scsi_common_init(qdev, &(s->conf), &s) == NULL) {
> +        return -1;
> +    }
> +    return 0;
> +}
> +
> +static int virtio_scsi_device_exit(DeviceState *qdev)
> +{
> +    VirtIOSCSI *s = VIRTIO_SCSI(qdev);
> +    VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
> +
> +    unregister_savevm(qdev, "virtio-scsi", s);
> +    g_free(s->cmd_vqs);
> +    virtio_common_cleanup(vdev);
> +    return 0;
> +}
> +
> +static Property virtio_scsi_properties[] = {
> +    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSI, conf),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void virtio_scsi_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
> +    dc->exit = virtio_scsi_device_exit;
> +    dc->props = virtio_scsi_properties;
> +    vdc->init = virtio_scsi_device_init;
> +    vdc->get_config = virtio_scsi_get_config;
> +    vdc->set_config = virtio_scsi_set_config;
> +    vdc->get_features = virtio_scsi_get_features;
> +    vdc->reset = virtio_scsi_reset;
> +}
> +
> +static const TypeInfo virtio_scsi_info = {
> +    .name = TYPE_VIRTIO_SCSI,
> +    .parent = TYPE_VIRTIO_DEVICE,
> +    .instance_size = sizeof(VirtIOSCSI),
> +    .class_init = virtio_scsi_class_init,
> +};
> +
> +static void virtio_register_types(void)
> +{
> +    type_register_static(&virtio_scsi_info);
> +}
> +
> +type_init(virtio_register_types)
> diff --git a/hw/virtio-scsi.h b/hw/virtio-scsi.h
> index 536c4c3..9ff639e 100644
> --- a/hw/virtio-scsi.h
> +++ b/hw/virtio-scsi.h
> @@ -18,6 +18,11 @@
>  #include "hw/pci/pci.h"
>  #include "hw/scsi.h"
> 
> +#define TYPE_VIRTIO_SCSI "virtio-scsi"
> +#define VIRTIO_SCSI(obj) \
> +        OBJECT_CHECK(VirtIOSCSI, (obj), TYPE_VIRTIO_SCSI)
> +
> +
>  /* The ID for virtio_scsi */
>  #define VIRTIO_ID_SCSI  8
>